1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2022, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Aspects
; use Aspects
;
27 with Atree
; use Atree
;
28 with Contracts
; use Contracts
;
29 with Debug
; use Debug
;
30 with Einfo
; use Einfo
;
31 with Einfo
.Entities
; use Einfo
.Entities
;
32 with Einfo
.Utils
; use Einfo
.Utils
;
33 with Errout
; use Errout
;
34 with Exp_Disp
; use Exp_Disp
;
36 with Exp_Util
; use Exp_Util
;
37 with Elists
; use Elists
;
38 with Fname
; use Fname
;
39 with Fname
.UF
; use Fname
.UF
;
40 with Freeze
; use Freeze
;
41 with Impunit
; use Impunit
;
42 with Inline
; use Inline
;
44 with Lib
.Load
; use Lib
.Load
;
45 with Lib
.Xref
; use Lib
.Xref
;
46 with Namet
; use Namet
;
47 with Nlists
; use Nlists
;
48 with Nmake
; use Nmake
;
50 with Output
; use Output
;
51 with Par_SCO
; use Par_SCO
;
52 with Restrict
; use Restrict
;
53 with Rident
; use Rident
;
54 with Rtsfind
; use Rtsfind
;
56 with Sem_Aux
; use Sem_Aux
;
57 with Sem_Ch3
; use Sem_Ch3
;
58 with Sem_Ch6
; use Sem_Ch6
;
59 with Sem_Ch7
; use Sem_Ch7
;
60 with Sem_Ch8
; use Sem_Ch8
;
61 with Sem_Ch13
; use Sem_Ch13
;
62 with Sem_Dist
; use Sem_Dist
;
63 with Sem_Prag
; use Sem_Prag
;
64 with Sem_Util
; use Sem_Util
;
65 with Sem_Warn
; use Sem_Warn
;
66 with Stand
; use Stand
;
67 with Sinfo
; use Sinfo
;
68 with Sinfo
.Nodes
; use Sinfo
.Nodes
;
69 with Sinfo
.Utils
; use Sinfo
.Utils
;
70 with Sinfo
.CN
; use Sinfo
.CN
;
71 with Sinput
; use Sinput
;
72 with Snames
; use Snames
;
73 with Style
; use Style
;
74 with Stylesw
; use Stylesw
;
75 with Tbuild
; use Tbuild
;
76 with Uname
; use Uname
;
77 with Warnsw
; use Warnsw
;
79 package body Sem_Ch10
is
81 -----------------------
82 -- Local Subprograms --
83 -----------------------
85 procedure Analyze_Context
(N
: Node_Id
);
86 -- Analyzes items in the context clause of compilation unit
88 procedure Build_Limited_Views
(N
: Node_Id
);
89 -- Build and decorate the list of shadow entities for a package mentioned
90 -- in a limited_with clause. If the package was not previously analyzed
91 -- then it also performs a basic decoration of the real entities. This is
92 -- required in order to avoid passing non-decorated entities to the
93 -- back-end. Implements Ada 2005 (AI-50217).
95 procedure Analyze_Proper_Body
(N
: Node_Id
; Nam
: Entity_Id
);
96 -- Common processing for all stubs (subprograms, tasks, packages, and
97 -- protected cases). N is the stub to be analyzed. Once the subunit name
98 -- is established, load and analyze. Nam is the non-overloadable entity
99 -- for which the proper body provides a completion. Subprogram stubs are
100 -- handled differently because they can be declarations.
102 procedure Check_Body_Needed_For_SAL
(Unit_Name
: Entity_Id
);
103 -- Check whether the source for the body of a compilation unit must be
104 -- included in a standalone library.
106 procedure Check_No_Elab_Code_All
(N
: Node_Id
);
107 -- Carries out possible tests for violation of No_Elab_Code all for withed
108 -- units in the Context_Items of unit N.
110 procedure Check_Private_Child_Unit
(N
: Node_Id
);
111 -- If a with_clause mentions a private child unit, the compilation unit
112 -- must be a member of the same family, as described in 10.1.2.
114 procedure Check_Stub_Level
(N
: Node_Id
);
115 -- Verify that a stub is declared immediately within a compilation unit,
116 -- and not in an inner frame.
118 procedure Expand_With_Clause
(Item
: Node_Id
; Nam
: Node_Id
; N
: Node_Id
);
119 -- When a child unit appears in a context clause, the implicit withs on
120 -- parents are made explicit, and with clauses are inserted in the context
121 -- clause before the one for the child. If a parent in the with_clause
122 -- is a renaming, the implicit with_clause is on the renaming whose name
123 -- is mentioned in the with_clause, and not on the package it renames.
124 -- N is the compilation unit whose list of context items receives the
125 -- implicit with_clauses.
127 procedure Generate_Parent_References
(N
: Node_Id
; P_Id
: Entity_Id
);
128 -- Generate cross-reference information for the parents of child units
129 -- and of subunits. N is a defining_program_unit_name, and P_Id is the
130 -- immediate parent scope.
132 function Has_With_Clause
135 Is_Limited
: Boolean := False) return Boolean;
136 -- Determine whether compilation unit C_Unit contains a [limited] with
137 -- clause for package Pack. Use the flag Is_Limited to designate desired
140 procedure Implicit_With_On_Parent
(Child_Unit
: Node_Id
; N
: Node_Id
);
141 -- If the main unit is a child unit, implicit withs are also added for
142 -- all its ancestors.
144 function In_Chain
(E
: Entity_Id
) return Boolean;
145 -- Check that the shadow entity is not already in the homonym chain, for
146 -- example through a limited_with clause in a parent unit.
148 procedure Install_Context_Clauses
(N
: Node_Id
; Chain
: Boolean := True);
149 -- Subsidiary to Install_Context and Install_Parents. Process all with
150 -- and use clauses for current unit and its library unit if any. The flag
151 -- Chain is used to control the "chaining" or linking together of use-type
152 -- and use-package clauses to avoid circularities with reinstalling
155 procedure Install_Limited_Context_Clauses
(N
: Node_Id
);
156 -- Subsidiary to Install_Context. Process only limited with_clauses for
157 -- current unit. Implements Ada 2005 (AI-50217).
159 procedure Install_Limited_With_Clause
(N
: Node_Id
);
160 -- Place shadow entities for a limited_with package in the visibility
161 -- structures for the current compilation. Implements Ada 2005 (AI-50217).
163 procedure Install_Parents
165 Is_Private
: Boolean;
166 Chain
: Boolean := True);
167 -- This procedure establishes the context for the compilation of a child
168 -- unit. If Lib_Unit is a child library spec then the context of the parent
169 -- is installed, and the parent itself made immediately visible, so that
170 -- the child unit is processed in the declarative region of the parent.
171 -- Install_Parents makes a recursive call to itself to ensure that all
172 -- parents are loaded in the nested case. If Lib_Unit is a library body,
173 -- the only effect of Install_Parents is to install the private decls of
174 -- the parents, because the visible parent declarations will have been
175 -- installed as part of the context of the corresponding spec. The flag
176 -- Chain is used to control the "chaining" or linking of use-type and
177 -- use-package clauses to avoid circularities when installing context.
179 procedure Install_Siblings
(U_Name
: Entity_Id
; N
: Node_Id
);
180 -- In the compilation of a child unit, a child of any of the ancestor
181 -- units is directly visible if it is visible, because the parent is in
182 -- an enclosing scope. Iterate over context to find child units of U_Name
183 -- or of some ancestor of it.
185 procedure Install_With_Clause
186 (With_Clause
: Node_Id
;
187 Private_With_OK
: Boolean := False);
188 -- If the unit is not a child unit, make unit immediately visible. The
189 -- caller ensures that the unit is not already currently installed. The
190 -- flag Private_With_OK is set true in Install_Private_With_Clauses, which
191 -- is called when compiling the private part of a package, or installing
192 -- the private declarations of a parent unit.
194 function Is_Ancestor_Unit
(U1
: Node_Id
; U2
: Node_Id
) return Boolean;
195 -- When compiling a unit Q descended from some parent unit P, a limited
196 -- with_clause in the context of P that names some other ancestor of Q
197 -- must not be installed because the ancestor is immediately visible.
199 function Is_Child_Spec
(Lib_Unit
: Node_Id
) return Boolean;
200 -- Lib_Unit is a library unit which may be a spec or a body. Is_Child_Spec
201 -- returns True if Lib_Unit is a library spec which is a child spec, i.e.
202 -- a library spec that has a parent. If the call to Is_Child_Spec returns
203 -- True, then Parent_Spec (Lib_Unit) is non-Empty and points to the
204 -- compilation unit for the parent spec.
206 -- Lib_Unit can also be a subprogram body that acts as its own spec. If the
207 -- Parent_Spec is non-empty, this is also a child unit.
209 procedure Remove_Context_Clauses
(N
: Node_Id
);
210 -- Subsidiary of previous one. Remove use_ and with_clauses
212 procedure Remove_Limited_With_Clause
(N
: Node_Id
);
213 -- Remove the shadow entities from visibility introduced for a package
214 -- mentioned in limited with clause N. Implements Ada 2005 (AI-50217).
216 procedure Remove_Limited_With_Unit
217 (Pack_Decl
: Node_Id
;
218 Lim_Clause
: Node_Id
:= Empty
);
219 -- Remove the shadow entities from visibility introduced for a package
220 -- denoted by declaration Pack_Decl. Lim_Clause is the related limited
221 -- with clause, if any. Implements Ada 2005 (AI-50217).
223 procedure Remove_Parents
(Lib_Unit
: Node_Id
);
224 -- Remove_Parents checks if Lib_Unit is a child spec. If so then the parent
225 -- contexts established by the corresponding call to Install_Parents are
226 -- removed. Remove_Parents contains a recursive call to itself to ensure
227 -- that all parents are removed in the nested case.
229 procedure Remove_Unit_From_Visibility
(Unit_Name
: Entity_Id
);
230 -- Reset all visibility flags on unit after compiling it, either as a main
231 -- unit or as a unit in the context.
233 procedure Unchain
(E
: Entity_Id
);
234 -- Remove single entity from visibility list
237 -- A dummy procedure, for debugging use, called just before analyzing the
238 -- main unit (after dealing with any context clauses).
240 --------------------------
241 -- Limited_With_Clauses --
242 --------------------------
244 -- Limited_With clauses are the mechanism chosen for Ada 2005 to support
245 -- mutually recursive types declared in different units. A limited_with
246 -- clause that names package P in the context of unit U makes the types
247 -- declared in the visible part of P available within U, but with the
248 -- restriction that these types can only be used as incomplete types.
249 -- The limited_with clause does not impose a semantic dependence on P,
250 -- and it is possible for two packages to have limited_with_clauses on
251 -- each other without creating an elaboration circularity.
253 -- To support this feature, the analysis of a limited_with clause must
254 -- create an abbreviated view of the package, without performing any
255 -- semantic analysis on it. This "package abstract" contains shadow types
256 -- that are in one-one correspondence with the real types in the package,
257 -- and that have the properties of incomplete types.
259 -- The implementation creates two element lists: one to chain the shadow
260 -- entities, and one to chain the corresponding type entities in the tree
261 -- of the package. Links between corresponding entities in both chains
262 -- allow the compiler to select the proper view of a given type, depending
263 -- on the context. Note that in contrast with the handling of private
264 -- types, the limited view and the nonlimited view of a type are treated
265 -- as separate entities, and no entity exchange needs to take place, which
266 -- makes the implementation much simpler than could be feared.
268 ------------------------------
269 -- Analyze_Compilation_Unit --
270 ------------------------------
272 procedure Analyze_Compilation_Unit
(N
: Node_Id
) is
273 Unit_Node
: constant Node_Id
:= Unit
(N
);
275 procedure Check_Redundant_Withs
276 (Context_Items
: List_Id
;
277 Spec_Context_Items
: List_Id
:= No_List
);
278 -- Determine whether the context list of a compilation unit contains
279 -- redundant with clauses. When checking body clauses against spec
280 -- clauses, set Context_Items to the context list of the body and
281 -- Spec_Context_Items to that of the spec. Parent packages are not
282 -- examined for documentation purposes.
284 ---------------------------
285 -- Check_Redundant_Withs --
286 ---------------------------
288 procedure Check_Redundant_Withs
289 (Context_Items
: List_Id
;
290 Spec_Context_Items
: List_Id
:= No_List
)
294 procedure Process_Body_Clauses
295 (Context_List
: List_Id
;
298 Used_Type_Or_Elab
: out Boolean);
299 -- Examine the context clauses of a package body, trying to match the
300 -- name entity of Clause with any list element. If the match occurs
301 -- on a use package clause set Used to True, for a use type clause or
302 -- pragma Elaborate[_All], set Used_Type_Or_Elab to True.
304 procedure Process_Spec_Clauses
305 (Context_List
: List_Id
;
308 Withed
: out Boolean;
309 Exit_On_Self
: Boolean := False);
310 -- Examine the context clauses of a package spec, trying to match
311 -- the name entity of Clause with any list element. If the match
312 -- occurs on a use package clause, set Used to True, for a with
313 -- package clause other than Clause, set Withed to True. Limited
314 -- with clauses, implicitly generated with clauses and withs
315 -- having pragmas Elaborate or Elaborate_All applied to them are
316 -- skipped. Exit_On_Self is used to control the search loop and
317 -- force an exit whenever Clause sees itself in the search.
319 --------------------------
320 -- Process_Body_Clauses --
321 --------------------------
323 procedure Process_Body_Clauses
324 (Context_List
: List_Id
;
327 Used_Type_Or_Elab
: out Boolean)
329 Nam_Ent
: constant Entity_Id
:= Entity
(Name
(Clause
));
334 function Same_Unit
(N
: Node_Id
; P
: Entity_Id
) return Boolean;
335 -- In an expanded name in a use clause, if the prefix is a renamed
336 -- package, the entity is set to the original package as a result,
337 -- when checking whether the package appears in a previous with
338 -- clause, the renaming has to be taken into account, to prevent
339 -- spurious/incorrect warnings. A common case is use of Text_IO.
345 function Same_Unit
(N
: Node_Id
; P
: Entity_Id
) return Boolean is
347 return Entity
(N
) = P
348 or else (Present
(Renamed_Entity
(P
))
349 and then Entity
(N
) = Renamed_Entity
(P
));
352 -- Start of processing for Process_Body_Clauses
356 Used_Type_Or_Elab
:= False;
358 Cont_Item
:= First
(Context_List
);
359 while Present
(Cont_Item
) loop
361 -- Package use clause
363 if Nkind
(Cont_Item
) = N_Use_Package_Clause
366 -- Search through use clauses
368 Use_Item
:= Name
(Cont_Item
);
370 -- Case of a direct use of the one we are looking for
372 if Entity
(Use_Item
) = Nam_Ent
then
375 -- Handle nested case, as in "with P; use P.Q.R"
382 -- Loop through prefixes looking for match
385 while Nkind
(UE
) = N_Expanded_Name
loop
386 if Same_Unit
(Prefix
(UE
), Nam_Ent
) then
398 elsif Nkind
(Cont_Item
) = N_Use_Type_Clause
399 and then not Used_Type_Or_Elab
405 -- Loop through prefixes looking for a match
407 UE
:= Prefix
(Subtype_Mark
(Cont_Item
));
409 if not Used_Type_Or_Elab
410 and then Same_Unit
(UE
, Nam_Ent
)
412 Used_Type_Or_Elab
:= True;
415 exit when Nkind
(UE
) /= N_Expanded_Name
;
420 -- Pragma Elaborate or Elaborate_All
422 elsif Nkind
(Cont_Item
) = N_Pragma
424 Pragma_Name_Unmapped
(Cont_Item
)
425 in Name_Elaborate | Name_Elaborate_All
426 and then not Used_Type_Or_Elab
429 First
(Pragma_Argument_Associations
(Cont_Item
));
430 while Present
(Prag_Unit
) and then not Used_Type_Or_Elab
loop
431 if Entity
(Expression
(Prag_Unit
)) = Nam_Ent
then
432 Used_Type_Or_Elab
:= True;
441 end Process_Body_Clauses
;
443 --------------------------
444 -- Process_Spec_Clauses --
445 --------------------------
447 procedure Process_Spec_Clauses
448 (Context_List
: List_Id
;
451 Withed
: out Boolean;
452 Exit_On_Self
: Boolean := False)
454 Nam_Ent
: constant Entity_Id
:= Entity
(Name
(Clause
));
461 Cont_Item
:= First
(Context_List
);
462 while Present
(Cont_Item
) loop
464 -- Stop the search since the context items after Cont_Item have
465 -- already been examined in a previous iteration of the reverse
466 -- loop in Check_Redundant_Withs.
469 and Cont_Item
= Clause
474 -- Package use clause
476 if Nkind
(Cont_Item
) = N_Use_Package_Clause
479 if Entity
(Name
(Cont_Item
)) = Nam_Ent
then
483 -- Package with clause. Avoid processing self, implicitly
484 -- generated with clauses or limited with clauses. Note that
485 -- we examine with clauses having pragmas Elaborate or
486 -- Elaborate_All applied to them due to cases such as:
490 -- pragma Elaborate (Pack);
492 -- In this case, the second with clause is redundant since
493 -- the pragma applies only to the first "with Pack;".
495 -- Note that we only consider with_clauses that comes from
496 -- source. In the case of renamings used as prefixes of names
497 -- in with_clauses, we generate a with_clause for the prefix,
498 -- which we do not treat as implicit because it is needed for
499 -- visibility analysis, but is also not redundant.
501 elsif Nkind
(Cont_Item
) = N_With_Clause
502 and then Comes_From_Source
(Cont_Item
)
503 and then not Implicit_With
(Cont_Item
)
504 and then not Limited_Present
(Cont_Item
)
505 and then Cont_Item
/= Clause
506 and then Entity
(Name
(Cont_Item
)) = Nam_Ent
513 end Process_Spec_Clauses
;
515 -- Start of processing for Check_Redundant_Withs
518 Clause
:= Last
(Context_Items
);
519 while Present
(Clause
) loop
521 -- Avoid checking implicitly generated with clauses, limited with
522 -- clauses or withs that have pragma Elaborate or Elaborate_All.
524 if Nkind
(Clause
) = N_With_Clause
525 and then not Implicit_With
(Clause
)
526 and then not Limited_Present
(Clause
)
527 and then not Elaborate_Present
(Clause
)
529 -- With_clauses introduced for renamings of parent clauses
530 -- are not marked implicit because they need to be properly
531 -- installed, but they do not come from source and do not
534 and then Comes_From_Source
(Clause
)
536 -- Package body-to-spec check
538 if Present
(Spec_Context_Items
) then
540 Used_In_Body
: Boolean;
541 Used_In_Spec
: Boolean;
542 Used_Type_Or_Elab
: Boolean;
543 Withed_In_Spec
: Boolean;
547 (Context_List
=> Spec_Context_Items
,
549 Used
=> Used_In_Spec
,
550 Withed
=> Withed_In_Spec
);
553 (Context_List
=> Context_Items
,
555 Used
=> Used_In_Body
,
556 Used_Type_Or_Elab
=> Used_Type_Or_Elab
);
558 -- "Type Elab" refers to the presence of either a use
559 -- type clause, pragmas Elaborate or Elaborate_All.
561 -- +---------------+---------------------------+------+
562 -- | Spec | Body | Warn |
563 -- +--------+------+--------+------+-----------+------+
564 -- | Withed | Used | Withed | Used | Type Elab | |
565 -- | X | | X | | | X |
566 -- | X | | X | X | | |
567 -- | X | | X | | X | |
568 -- | X | | X | X | X | |
569 -- | X | X | X | | | X |
570 -- | X | X | X | | X | |
571 -- | X | X | X | X | | X |
572 -- | X | X | X | X | X | |
573 -- +--------+------+--------+------+-----------+------+
576 and then not Used_Type_Or_Elab
)
578 ((not Used_In_Spec
and then not Used_In_Body
)
579 or else Used_In_Spec
)
581 Error_Msg_N
-- CODEFIX
582 ("redundant with clause in body?r?", Clause
);
586 -- Standalone package spec or body check
589 if Is_Ancestor_Package
(Entity
(Name
(Clause
)),
590 Defining_Entity
(Unit_Node
))
593 ("unnecessary with of ancestor?r?", Clause
);
597 Dummy
: Boolean := False;
598 Withed
: Boolean := False;
601 -- The mechanism for examining the context clauses of a
602 -- package spec can be applied to package body clauses.
605 (Context_List
=> Context_Items
,
609 Exit_On_Self
=> True);
612 Error_Msg_N
-- CODEFIX
613 ("redundant with clause?r?", Clause
);
621 end Check_Redundant_Withs
;
625 Main_Cunit
: constant Node_Id
:= Cunit
(Main_Unit
);
626 Lib_Unit
: Node_Id
:= Library_Unit
(N
);
627 Par_Spec_Name
: Unit_Name_Type
;
629 Unum
: Unit_Number_Type
;
631 -- Start of processing for Analyze_Compilation_Unit
634 Exp_Put_Image
.Preload_Root_Buffer_Type
(N
);
636 Process_Compilation_Unit_Pragmas
(N
);
638 -- If the unit is a subunit whose parent has not been analyzed (which
639 -- indicates that the main unit is a subunit, either the current one or
640 -- one of its descendants) then the subunit is compiled as part of the
641 -- analysis of the parent, which we proceed to do. Basically this gets
642 -- handled from the top down and we don't want to do anything at this
643 -- level (i.e. this subunit will be handled on the way down from the
644 -- parent), so at this level we immediately return. If the subunit ends
645 -- up not analyzed, it means that the parent did not contain a stub for
646 -- it, or that there errors were detected in some ancestor.
648 if Nkind
(Unit_Node
) = N_Subunit
and then not Analyzed
(Lib_Unit
) then
649 Semantics
(Lib_Unit
);
651 if not Analyzed
(Proper_Body
(Unit_Node
)) then
652 if Serious_Errors_Detected
> 0 then
653 Error_Msg_N
("subunit not analyzed (errors in parent unit)", N
);
655 Error_Msg_N
("missing stub for subunit", N
);
662 -- Analyze context (this will call Sem recursively for with'ed units) To
663 -- detect circularities among with-clauses that are not caught during
664 -- loading, we set the Context_Pending flag on the current unit. If the
665 -- flag is already set there is a potential circularity. We exclude
666 -- predefined units from this check because they are known to be safe.
667 -- We also exclude package bodies that are present because circularities
668 -- between bodies are harmless (and necessary).
670 if Context_Pending
(N
) then
672 Circularity
: Boolean := True;
675 if In_Predefined_Unit
(N
) then
676 Circularity
:= False;
679 for U
in Main_Unit
+ 1 .. Last_Unit
loop
680 if Nkind
(Unit
(Cunit
(U
))) = N_Package_Body
681 and then not Analyzed
(Cunit
(U
))
683 Circularity
:= False;
690 Error_Msg_N
("circular dependency caused by with_clauses", N
);
692 ("\possibly missing limited_with clause"
693 & " in one of the following", N
);
695 for U
in Main_Unit
.. Last_Unit
loop
696 if Context_Pending
(Cunit
(U
)) then
697 Error_Msg_Unit_1
:= Get_Unit_Name
(Unit
(Cunit
(U
)));
698 Error_Msg_N
("\unit$", N
);
702 raise Unrecoverable_Error
;
706 Set_Context_Pending
(N
);
711 Set_Context_Pending
(N
, False);
713 -- If the unit is a package body, the spec is already loaded and must be
714 -- analyzed first, before we analyze the body.
716 if Nkind
(Unit_Node
) = N_Package_Body
then
718 -- If no Lib_Unit, then there was a serious previous error, so just
719 -- ignore the entire analysis effort.
721 if No
(Lib_Unit
) then
722 Check_Error_Detected
;
726 -- Analyze the package spec
728 Semantics
(Lib_Unit
);
730 -- Check for unused with's
732 Check_Unused_Withs
(Get_Cunit_Unit_Number
(Lib_Unit
));
734 -- Verify that the library unit is a package declaration
736 if Nkind
(Unit
(Lib_Unit
)) not in
737 N_Package_Declaration | N_Generic_Package_Declaration
740 ("no legal package declaration for package body", N
);
743 -- Otherwise, the entity in the declaration is visible. Update the
744 -- version to reflect dependence of this body on the spec.
747 Spec_Id
:= Defining_Entity
(Unit
(Lib_Unit
));
748 Set_Is_Immediately_Visible
(Spec_Id
, True);
749 Version_Update
(N
, Lib_Unit
);
751 if Nkind
(Defining_Unit_Name
(Unit_Node
)) =
752 N_Defining_Program_Unit_Name
754 Generate_Parent_References
(Unit_Node
, Scope
(Spec_Id
));
759 -- If the unit is a subprogram body, then we similarly need to analyze
760 -- its spec. However, things are a little simpler in this case, because
761 -- here, this analysis is done mostly for error checking and consistency
762 -- purposes (but not only, e.g. there could be a contract on the spec),
763 -- so there's nothing else to be done.
765 elsif Nkind
(Unit_Node
) = N_Subprogram_Body
then
766 if Acts_As_Spec
(N
) then
768 -- If the subprogram body is a child unit, we must create a
769 -- declaration for it, in order to properly load the parent(s).
770 -- After this, the original unit does not acts as a spec, because
771 -- there is an explicit one. If this unit appears in a context
772 -- clause, then an implicit with on the parent will be added when
773 -- installing the context. If this is the main unit, there is no
774 -- Unit_Table entry for the declaration (it has the unit number
775 -- of the main unit) and code generation is unaffected.
777 Unum
:= Get_Cunit_Unit_Number
(N
);
778 Par_Spec_Name
:= Get_Parent_Spec_Name
(Unit_Name
(Unum
));
780 if Present
(Par_Spec_Name
) then
783 (Load_Name
=> Par_Spec_Name
,
788 if Unum
/= No_Unit
then
790 -- Build subprogram declaration and attach parent unit to it
791 -- This subprogram declaration does not come from source,
792 -- Nevertheless the backend must generate debugging info for
793 -- it, and this must be indicated explicitly. We also mark
794 -- the body entity as a child unit now, to prevent a
795 -- cascaded error if the spec entity cannot be entered
796 -- in its scope. Finally we create a Units table entry for
797 -- the subprogram declaration, to maintain a one-to-one
798 -- correspondence with compilation unit nodes. This is
799 -- critical for the tree traversals performed by CodePeer.
802 Loc
: constant Source_Ptr
:= Sloc
(N
);
803 SCS
: constant Boolean :=
804 Get_Comes_From_Source_Default
;
807 Set_Comes_From_Source_Default
(False);
809 -- Note: We copy the Context_Items from the explicit body
810 -- to the implicit spec, setting the former to Empty_List
811 -- to preserve the treeish nature of the tree, during
812 -- analysis of the spec. Then we put it back the way it
813 -- was -- copy the Context_Items from the spec to the
814 -- body, and set the spec Context_Items to Empty_List.
815 -- It is necessary to preserve the treeish nature,
816 -- because otherwise we will call End_Use_* twice on the
820 Make_Compilation_Unit
(Loc
,
821 Context_Items
=> Context_Items
(N
),
823 Make_Subprogram_Declaration
(Sloc
(N
),
826 (Specification
(Unit_Node
))),
828 Make_Compilation_Unit_Aux
(Loc
));
830 Set_Context_Items
(N
, Empty_List
);
831 Set_Library_Unit
(N
, Lib_Unit
);
832 Set_Parent_Spec
(Unit
(Lib_Unit
), Cunit
(Unum
));
833 Make_Child_Decl_Unit
(N
);
834 Semantics
(Lib_Unit
);
836 -- Now that a separate declaration exists, the body
837 -- of the child unit does not act as spec any longer.
839 Set_Acts_As_Spec
(N
, False);
840 Move_Aspects
(From
=> Unit_Node
, To
=> Unit
(Lib_Unit
));
841 Set_Is_Child_Unit
(Defining_Entity
(Unit_Node
));
842 Set_Debug_Info_Needed
(Defining_Entity
(Unit
(Lib_Unit
)));
843 Set_Comes_From_Source_Default
(SCS
);
845 -- Restore Context_Items to the body
847 Set_Context_Items
(N
, Context_Items
(Lib_Unit
));
848 Set_Context_Items
(Lib_Unit
, Empty_List
);
853 -- Here for subprogram with separate declaration
856 Semantics
(Lib_Unit
);
857 Check_Unused_Withs
(Get_Cunit_Unit_Number
(Lib_Unit
));
858 Version_Update
(N
, Lib_Unit
);
861 -- If this is a child unit, generate references to the parents
863 if Nkind
(Defining_Unit_Name
(Specification
(Unit_Node
))) =
864 N_Defining_Program_Unit_Name
866 Generate_Parent_References
867 (Specification
(Unit_Node
),
868 Scope
(Defining_Entity
(Unit
(Lib_Unit
))));
872 -- If it is a child unit, the parent must be elaborated first and we
873 -- update version, since we are dependent on our parent.
875 if Is_Child_Spec
(Unit_Node
) then
877 -- The analysis of the parent is done with style checks off
880 Save_Style_Check
: constant Boolean := Style_Check
;
883 if not GNAT_Mode
then
884 Style_Check
:= False;
887 Semantics
(Parent_Spec
(Unit_Node
));
888 Version_Update
(N
, Parent_Spec
(Unit_Node
));
890 -- Restore style check settings
892 Style_Check
:= Save_Style_Check
;
896 -- With the analysis done, install the context. Note that we can't
897 -- install the context from the with clauses as we analyze them, because
898 -- each with clause must be analyzed in a clean visibility context, so
899 -- we have to wait and install them all at once.
903 if Is_Child_Spec
(Unit_Node
) then
905 -- Set the entities of all parents in the program_unit_name
907 Generate_Parent_References
908 (Unit_Node
, Get_Parent_Entity
(Unit
(Parent_Spec
(Unit_Node
))));
911 -- All components of the context: with-clauses, library unit, ancestors
912 -- if any, (and their context) are analyzed and installed.
914 -- Call special debug routine sm if this is the main unit
916 if Current_Sem_Unit
= Main_Unit
then
920 -- Now analyze the unit (package, subprogram spec, body) itself
924 if Warn_On_Redundant_Constructs
then
925 Check_Redundant_Withs
(Context_Items
(N
));
927 if Nkind
(Unit_Node
) = N_Package_Body
then
928 Check_Redundant_Withs
929 (Context_Items
=> Context_Items
(N
),
930 Spec_Context_Items
=> Context_Items
(Lib_Unit
));
934 -- The above call might have made Unit_Node an N_Subprogram_Body from
935 -- something else, so propagate any Acts_As_Spec flag.
937 if Nkind
(Unit_Node
) = N_Subprogram_Body
938 and then Acts_As_Spec
(Unit_Node
)
940 Set_Acts_As_Spec
(N
);
943 -- Register predefined units in Rtsfind
945 if In_Predefined_Unit
(N
) then
946 Set_RTU_Loaded
(Unit_Node
);
949 -- Treat compilation unit pragmas that appear after the library unit
952 Prag_Node
: Node_Id
:= First
(Pragmas_After
(Aux_Decls_Node
(N
)));
954 while Present
(Prag_Node
) loop
960 -- Analyze the contract of a [generic] subprogram that acts as a
961 -- compilation unit after all compilation pragmas have been analyzed.
963 if Nkind
(Unit_Node
) in
964 N_Generic_Subprogram_Declaration | N_Subprogram_Declaration
966 Analyze_Entry_Or_Subprogram_Contract
(Defining_Entity
(Unit_Node
));
969 -- Generate distribution stubs if requested and no error
972 and then (Distribution_Stub_Mode
= Generate_Receiver_Stub_Body
974 Distribution_Stub_Mode
= Generate_Caller_Stub_Body
)
975 and then Fatal_Error
(Main_Unit
) /= Error_Detected
977 if Is_RCI_Pkg_Spec_Or_Body
(N
) then
979 -- Regular RCI package
981 Add_Stub_Constructs
(N
);
983 elsif (Nkind
(Unit_Node
) = N_Package_Declaration
984 and then Is_Shared_Passive
(Defining_Entity
985 (Specification
(Unit_Node
))))
986 or else (Nkind
(Unit_Node
) = N_Package_Body
988 Is_Shared_Passive
(Corresponding_Spec
(Unit_Node
)))
990 -- Shared passive package
992 Add_Stub_Constructs
(N
);
994 elsif Nkind
(Unit_Node
) = N_Package_Instantiation
996 Is_Remote_Call_Interface
997 (Defining_Entity
(Specification
(Instance_Spec
(Unit_Node
))))
999 -- Instantiation of a RCI generic package
1001 Add_Stub_Constructs
(N
);
1005 -- Build dispatch tables of library-level tagged types only now because
1006 -- the generation of distribution stubs above may create some of them.
1008 if Expander_Active
and then Tagged_Type_Expansion
then
1009 case Nkind
(Unit_Node
) is
1010 when N_Package_Declaration | N_Package_Body
=>
1011 Build_Static_Dispatch_Tables
(Unit_Node
);
1013 when N_Package_Instantiation
=>
1014 Build_Static_Dispatch_Tables
(Instance_Spec
(Unit_Node
));
1021 -- Remove unit from visibility, so that environment is clean for the
1022 -- next compilation, which is either the main unit or some other unit
1025 if Nkind
(Unit_Node
) in N_Package_Declaration
1026 | N_Package_Renaming_Declaration
1027 | N_Subprogram_Declaration
1028 | N_Generic_Declaration
1029 or else (Nkind
(Unit_Node
) = N_Subprogram_Body
1030 and then Acts_As_Spec
(Unit_Node
))
1032 Remove_Unit_From_Visibility
(Defining_Entity
(Unit_Node
));
1034 -- If the unit is an instantiation whose body will be elaborated for
1035 -- inlining purposes, use the proper entity of the instance. The entity
1036 -- may be missing if the instantiation was illegal.
1038 elsif Nkind
(Unit_Node
) = N_Package_Instantiation
1039 and then not Error_Posted
(Unit_Node
)
1040 and then Present
(Instance_Spec
(Unit_Node
))
1042 Remove_Unit_From_Visibility
1043 (Defining_Entity
(Instance_Spec
(Unit_Node
)));
1045 elsif Nkind
(Unit_Node
) = N_Package_Body
1046 or else (Nkind
(Unit_Node
) = N_Subprogram_Body
1047 and then not Acts_As_Spec
(Unit_Node
))
1049 -- Bodies that are not the main unit are compiled if they are generic
1050 -- or contain generic or inlined units. Their analysis brings in the
1051 -- context of the corresponding spec (unit declaration) which must be
1052 -- removed as well, to return the compilation environment to its
1055 Remove_Context
(Lib_Unit
);
1056 Set_Is_Immediately_Visible
(Defining_Entity
(Unit
(Lib_Unit
)), False);
1059 -- Last step is to deinstall the context we just installed as well as
1060 -- the unit just compiled.
1064 -- When generating code for a non-generic main unit, check that withed
1065 -- generic units have a body if they need it, even if the units have not
1066 -- been instantiated. Force the load of the bodies to produce the proper
1067 -- error if the body is absent. The same applies to GNATprove mode, with
1068 -- the added benefit of capturing global references within the generic.
1069 -- This in turn allows for proper inlining of subprogram bodies without
1070 -- a previous declaration.
1072 if Get_Cunit_Unit_Number
(N
) = Main_Unit
1073 and then ((Operating_Mode
= Generate_Code
and then Expander_Active
)
1075 (Operating_Mode
= Check_Semantics
and then GNATprove_Mode
))
1077 -- Check whether the source for the body of the unit must be included
1078 -- in a standalone library.
1080 Check_Body_Needed_For_SAL
(Cunit_Entity
(Main_Unit
));
1082 -- Indicate that the main unit is now analyzed, to catch possible
1083 -- circularities between it and generic bodies. Remove main unit from
1084 -- visibility. This might seem superfluous, but the main unit must
1085 -- not be visible in the generic body expansions that follow.
1087 Set_Analyzed
(N
, True);
1088 Set_Is_Immediately_Visible
(Cunit_Entity
(Main_Unit
), False);
1093 Un
: Unit_Number_Type
;
1095 Save_Style_Check
: constant Boolean := Style_Check
;
1098 Item
:= First
(Context_Items
(N
));
1099 while Present
(Item
) loop
1101 -- Check for explicit with clause
1103 if Nkind
(Item
) = N_With_Clause
1104 and then not Implicit_With
(Item
)
1106 -- Ada 2005 (AI-50217): Ignore limited-withed units
1108 and then not Limited_Present
(Item
)
1110 Nam
:= Entity
(Name
(Item
));
1112 -- Compile the generic subprogram, unless it is intrinsic or
1113 -- imported so no body is required, or generic package body
1114 -- if the package spec requires a body.
1116 if (Is_Generic_Subprogram
(Nam
)
1117 and then not Is_Intrinsic_Subprogram
(Nam
)
1118 and then not Is_Imported
(Nam
))
1119 or else (Ekind
(Nam
) = E_Generic_Package
1120 and then Unit_Requires_Body
(Nam
))
1122 Style_Check
:= False;
1124 if Present
(Renamed_Entity
(Nam
)) then
1130 (Unit_Declaration_Node
1131 (Renamed_Entity
(Nam
)))),
1140 Get_Body_Name
(Get_Unit_Name
(Item
)),
1147 if Un
= No_Unit
then
1149 ("body of generic unit& not found", Item
, Nam
);
1152 elsif not Analyzed
(Cunit
(Un
))
1153 and then Un
/= Main_Unit
1154 and then Fatal_Error
(Un
) /= Error_Detected
1156 Style_Check
:= False;
1157 Semantics
(Cunit
(Un
));
1165 -- Restore style checks settings
1167 Style_Check
:= Save_Style_Check
;
1170 -- In GNATprove mode, force the loading of an Interrupt_Priority when
1171 -- processing compilation units with potentially "main" subprograms.
1172 -- This is required for the ceiling priority protocol checks, which
1173 -- are triggered by these subprograms.
1176 and then Nkind
(Unit_Node
) in N_Function_Instantiation
1177 | N_Procedure_Instantiation
1184 case Nkind
(Unit_Node
) is
1185 when N_Subprogram_Body
=>
1186 Spec
:= Specification
(Unit_Node
);
1188 when N_Subprogram_Instantiation
=>
1190 Subprogram_Specification
(Entity
(Name
(Unit_Node
)));
1193 raise Program_Error
;
1196 pragma Assert
(Nkind
(Spec
) in N_Subprogram_Specification
);
1198 -- Main subprogram must have no parameters, and if it is a
1199 -- function, it must return an integer.
1201 if No
(Parameter_Specifications
(Spec
))
1202 and then (Nkind
(Spec
) = N_Procedure_Specification
1204 Is_Integer_Type
(Etype
(Result_Definition
(Spec
))))
1206 SPARK_Implicit_Load
(RE_Interrupt_Priority
);
1212 -- Deal with creating elaboration counter if needed. We create an
1213 -- elaboration counter only for units that come from source since
1214 -- units manufactured by the compiler never need elab checks.
1216 if Comes_From_Source
(N
)
1217 and then Nkind
(Unit_Node
) in N_Package_Declaration
1218 | N_Generic_Package_Declaration
1219 | N_Subprogram_Declaration
1220 | N_Generic_Subprogram_Declaration
1223 Loc
: constant Source_Ptr
:= Sloc
(N
);
1224 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(Loc
);
1227 Spec_Id
:= Defining_Entity
(Unit_Node
);
1228 Generate_Definition
(Spec_Id
);
1230 -- See if an elaboration entity is required for possible access
1231 -- before elaboration checking. Note that we must allow for this
1232 -- even if -gnatE is not set, since a client may be compiled in
1233 -- -gnatE mode and reference the entity.
1235 -- These entities are also used by the binder to prevent multiple
1236 -- attempts to execute the elaboration code for the library case
1237 -- where the elaboration routine might otherwise be called more
1240 -- They are also needed to ensure explicit visibility from the
1241 -- binder generated code of all the units involved in a partition
1242 -- when control-flow preservation is requested.
1244 if not Opt
.Suppress_Control_Flow_Optimizations
1246 ( -- Pure units do not need checks
1250 -- Preelaborated units do not need checks
1252 or else Is_Preelaborated
(Spec_Id
)
1254 -- No checks needed if pragma Elaborate_Body present
1256 or else Has_Pragma_Elaborate_Body
(Spec_Id
)
1258 -- No checks needed if unit does not require a body
1260 or else not Unit_Requires_Body
(Spec_Id
)
1262 -- No checks needed for predefined files
1264 or else Is_Predefined_Unit
(Unum
)
1266 -- No checks required if no separate spec
1268 or else Acts_As_Spec
(N
)
1271 -- This is a case where we only need the entity for checking to
1272 -- prevent multiple elaboration checks.
1274 Set_Elaboration_Entity_Required
(Spec_Id
, False);
1276 -- Otherwise the unit requires an elaboration entity because it
1280 Set_Elaboration_Entity_Required
(Spec_Id
);
1283 Build_Elaboration_Entity
(N
, Spec_Id
);
1287 -- Freeze the compilation unit entity. This for sure is needed because
1288 -- of some warnings that can be output (see Freeze_Subprogram), but may
1289 -- in general be required. If freezing actions result, place them in the
1290 -- compilation unit actions list, and analyze them.
1293 L
: constant List_Id
:=
1294 Freeze_Entity
(Cunit_Entity
(Current_Sem_Unit
), N
);
1296 while Is_Non_Empty_List
(L
) loop
1297 Insert_Library_Level_Action
(Remove_Head
(L
));
1303 -- Call Check_Package_Body so that a body containing subprograms with
1304 -- Inline_Always can be made available for front end inlining.
1306 if Nkind
(Unit_Node
) = N_Package_Declaration
1307 and then Get_Cunit_Unit_Number
(N
) /= Main_Unit
1309 -- We don't need to do this if the Expander is not active, since there
1310 -- is no code to inline.
1312 and then Expander_Active
1315 Save_Style_Check
: constant Boolean := Style_Check
;
1316 Save_Warning
: constant Warning_Mode_Type
:= Warning_Mode
;
1317 Options
: Style_Check_Options
;
1320 Save_Style_Check_Options
(Options
);
1321 Reset_Style_Check_Options
;
1322 Opt
.Warning_Mode
:= Suppress
;
1324 Check_Package_Body_For_Inlining
(N
, Defining_Entity
(Unit_Node
));
1326 Reset_Style_Check_Options
;
1327 Set_Style_Check_Options
(Options
);
1328 Style_Check
:= Save_Style_Check
;
1329 Warning_Mode
:= Save_Warning
;
1333 -- If we are generating obsolescent warnings, then here is where we
1334 -- generate them for the with'ed items. The reason for this special
1335 -- processing is that the normal mechanism of generating the warnings
1336 -- for referenced entities does not work for context clause references.
1337 -- That's because when we first analyze the context, it is too early to
1338 -- know if the with'ing unit is itself obsolescent (which suppresses
1342 and then Warn_On_Obsolescent_Feature
1343 and then Nkind
(Unit_Node
) not in N_Generic_Instantiation
1345 -- Push current compilation unit as scope, so that the test for
1346 -- being within an obsolescent unit will work correctly. The check
1347 -- is not performed within an instantiation, because the warning
1348 -- will have been emitted in the corresponding generic unit.
1350 Push_Scope
(Defining_Entity
(Unit_Node
));
1352 -- Loop through context items to deal with with clauses
1360 Item
:= First
(Context_Items
(N
));
1361 while Present
(Item
) loop
1362 if Nkind
(Item
) = N_With_Clause
1364 -- Suppress this check in limited-withed units. Further work
1365 -- needed here if we decide to incorporate this check on
1366 -- limited-withed units.
1368 and then not Limited_Present
(Item
)
1371 Ent
:= Entity
(Nam
);
1373 if Is_Obsolescent
(Ent
) then
1374 Output_Obsolescent_Entity_Warnings
(Nam
, Ent
);
1382 -- Remove temporary install of current unit as scope
1387 -- If No_Elaboration_Code_All was encountered, this is where we do the
1388 -- transitive test of with'ed units to make sure they have the aspect.
1389 -- This is delayed till the end of analyzing the compilation unit to
1390 -- ensure that the pragma/aspect, if present, has been analyzed.
1392 Check_No_Elab_Code_All
(N
);
1393 end Analyze_Compilation_Unit
;
1395 ---------------------
1396 -- Analyze_Context --
1397 ---------------------
1399 procedure Analyze_Context
(N
: Node_Id
) is
1400 Ukind
: constant Node_Kind
:= Nkind
(Unit
(N
));
1404 -- First process all configuration pragmas at the start of the context
1405 -- items. Strictly these are not part of the context clause, but that
1406 -- is where the parser puts them. In any case for sure we must analyze
1407 -- these before analyzing the actual context items, since they can have
1408 -- an effect on that analysis (e.g. pragma Ada_2005 may allow a unit to
1409 -- be with'ed as a result of changing categorizations in Ada 2005).
1411 Item
:= First
(Context_Items
(N
));
1412 while Present
(Item
)
1413 and then Nkind
(Item
) = N_Pragma
1414 and then Pragma_Name
(Item
) in Configuration_Pragma_Names
1420 -- This is the point at which we capture the configuration settings
1421 -- for the unit. At the moment only the Optimize_Alignment setting
1422 -- needs to be captured. Probably more later ???
1424 if Optimize_Alignment_Local
then
1425 Set_OA_Setting
(Current_Sem_Unit
, 'L');
1427 Set_OA_Setting
(Current_Sem_Unit
, Optimize_Alignment
);
1430 -- Loop through actual context items. This is done in two passes:
1432 -- a) The first pass analyzes nonlimited with clauses and also any
1433 -- configuration pragmas (we need to get the latter analyzed right
1434 -- away, since they can affect processing of subsequent items).
1436 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
1438 while Present
(Item
) loop
1440 -- For with clause, analyze the with clause, and then update the
1441 -- version, since we are dependent on a unit that we with.
1443 if Nkind
(Item
) = N_With_Clause
1444 and then not Limited_Present
(Item
)
1446 -- Skip analyzing with clause if no unit, nothing to do (this
1447 -- happens for a with that references a non-existent unit).
1449 if Present
(Library_Unit
(Item
)) then
1451 -- Skip analyzing with clause if this is a with_clause for
1452 -- the main unit, which happens if a subunit has a useless
1453 -- with_clause on its parent.
1455 if Library_Unit
(Item
) /= Cunit
(Current_Sem_Unit
) then
1458 -- Here for the case of a useless with for the main unit
1461 Set_Entity
(Name
(Item
), Cunit_Entity
(Current_Sem_Unit
));
1465 -- Do version update (skipped for implicit with)
1467 if not Implicit_With
(Item
) then
1468 Version_Update
(N
, Library_Unit
(Item
));
1471 -- Skip pragmas. Configuration pragmas at the start were handled in
1472 -- the loop above, and remaining pragmas are not processed until we
1473 -- actually install the context (see Install_Context). We delay the
1474 -- analysis of these pragmas to make sure that we have installed all
1475 -- the implicit with's on parent units.
1477 -- Skip use clauses at this stage, since we don't want to do any
1478 -- installing of potentially use-visible entities until we
1479 -- actually install the complete context (in Install_Context).
1480 -- Otherwise things can get installed in the wrong context.
1489 -- Second pass: examine all limited_with clauses. All other context
1490 -- items are ignored in this pass.
1492 Item
:= First
(Context_Items
(N
));
1493 while Present
(Item
) loop
1494 if Nkind
(Item
) = N_With_Clause
1495 and then Limited_Present
(Item
)
1497 -- No need to check errors on implicitly generated limited-with
1500 if not Implicit_With
(Item
) then
1502 -- Verify that the illegal contexts given in 10.1.2 (18/2) are
1503 -- properly rejected, including renaming declarations.
1505 if Ukind
not in N_Package_Declaration
1506 | N_Subprogram_Declaration
1507 | N_Generic_Declaration
1508 | N_Generic_Instantiation
1510 Error_Msg_N
("limited with_clause not allowed here", Item
);
1512 -- Check wrong use of a limited with clause applied to the
1513 -- compilation unit containing the limited-with clause.
1515 -- limited with P.Q;
1516 -- package P.Q is ...
1518 elsif Unit
(Library_Unit
(Item
)) = Unit
(N
) then
1519 Error_Msg_N
("wrong use of limited-with clause", Item
);
1521 -- Check wrong use of limited-with clause applied to some
1522 -- immediate ancestor.
1524 elsif Is_Child_Spec
(Unit
(N
)) then
1526 Lib_U
: constant Entity_Id
:= Unit
(Library_Unit
(Item
));
1530 P
:= Parent_Spec
(Unit
(N
));
1532 if Unit
(P
) = Lib_U
then
1534 ("limited with_clause cannot name ancestor",
1539 exit when not Is_Child_Spec
(Unit
(P
));
1540 P
:= Parent_Spec
(Unit
(P
));
1545 -- Check if the limited-withed unit is already visible through
1546 -- some context clause of the current compilation unit or some
1547 -- ancestor of the current compilation unit.
1550 Lim_Unit_Name
: constant Node_Id
:= Name
(Item
);
1551 Comp_Unit
: Node_Id
;
1553 Unit_Name
: Node_Id
;
1558 It
:= First
(Context_Items
(Comp_Unit
));
1559 while Present
(It
) loop
1561 and then Nkind
(It
) = N_With_Clause
1562 and then not Limited_Present
(It
)
1563 and then Nkind
(Unit
(Library_Unit
(It
))) in
1564 N_Package_Declaration |
1565 N_Package_Renaming_Declaration
1567 if Nkind
(Unit
(Library_Unit
(It
))) =
1568 N_Package_Declaration
1570 Unit_Name
:= Name
(It
);
1572 Unit_Name
:= Name
(Unit
(Library_Unit
(It
)));
1575 -- Check if the named package (or some ancestor)
1576 -- leaves visible the full-view of the unit given
1577 -- in the limited-with clause.
1580 if Designate_Same_Unit
(Lim_Unit_Name
,
1583 Error_Msg_Sloc
:= Sloc
(It
);
1585 ("simultaneous visibility of limited and "
1586 & "unlimited views not allowed", Item
);
1588 ("\unlimited view visible through context "
1589 & "clause #", Item
);
1592 elsif Nkind
(Unit_Name
) = N_Identifier
then
1596 Unit_Name
:= Prefix
(Unit_Name
);
1603 exit when not Is_Child_Spec
(Unit
(Comp_Unit
));
1605 Comp_Unit
:= Parent_Spec
(Unit
(Comp_Unit
));
1610 -- Skip analyzing with clause if no unit, see above
1612 if Present
(Library_Unit
(Item
)) then
1616 -- A limited_with does not impose an elaboration order, but there
1617 -- is a semantic dependency for recompilation purposes.
1619 if not Implicit_With
(Item
) then
1620 Version_Update
(N
, Library_Unit
(Item
));
1623 -- Pragmas and use clauses and with clauses other than limited with's
1624 -- are ignored in this pass through the context items.
1632 end Analyze_Context
;
1634 -------------------------------
1635 -- Analyze_Package_Body_Stub --
1636 -------------------------------
1638 procedure Analyze_Package_Body_Stub
(N
: Node_Id
) is
1639 Id
: constant Entity_Id
:= Defining_Entity
(N
);
1641 Opts
: Config_Switches_Type
;
1644 -- The package declaration must be in the current declarative part
1646 Check_Stub_Level
(N
);
1647 Nam
:= Current_Entity_In_Scope
(Id
);
1649 if No
(Nam
) or else not Is_Package_Or_Generic_Package
(Nam
) then
1650 Error_Msg_N
("missing specification for package stub", N
);
1652 elsif Has_Completion
(Nam
)
1653 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(Nam
)))
1655 Error_Msg_N
("duplicate or redundant stub for package", N
);
1658 -- Retain and restore the configuration options of the enclosing
1659 -- context as the proper body may introduce a set of its own.
1661 Opts
:= Save_Config_Switches
;
1663 -- Indicate that the body of the package exists. If we are doing
1664 -- only semantic analysis, the stub stands for the body. If we are
1665 -- generating code, the existence of the body will be confirmed
1666 -- when we load the proper body.
1668 Set_Scope
(Id
, Current_Scope
);
1669 Mutate_Ekind
(Id
, E_Package_Body
);
1670 Set_Etype
(Id
, Standard_Void_Type
);
1672 if Has_Aspects
(N
) then
1673 Analyze_Aspect_Specifications
(N
, Id
);
1676 Set_Has_Completion
(Nam
);
1677 Set_Corresponding_Spec_Of_Stub
(N
, Nam
);
1678 Generate_Reference
(Nam
, Id
, 'b');
1679 Analyze_Proper_Body
(N
, Nam
);
1681 Restore_Config_Switches
(Opts
);
1683 end Analyze_Package_Body_Stub
;
1685 -------------------------
1686 -- Analyze_Proper_Body --
1687 -------------------------
1689 procedure Analyze_Proper_Body
(N
: Node_Id
; Nam
: Entity_Id
) is
1690 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
1692 procedure Optional_Subunit
;
1693 -- This procedure is called when the main unit is a stub, or when we
1694 -- are not generating code. In such a case, we analyze the subunit if
1695 -- present, which is user-friendly, but we don't complain if the subunit
1696 -- is missing. In GNATprove_Mode, we issue an error to avoid formal
1697 -- verification of a partial unit.
1699 ----------------------
1700 -- Optional_Subunit --
1701 ----------------------
1703 procedure Optional_Subunit
is
1704 Comp_Unit
: Node_Id
;
1705 Unum
: Unit_Number_Type
;
1708 -- Try to load subunit, but ignore any errors that occur during the
1709 -- loading of the subunit, by using the special feature in Errout to
1710 -- ignore all errors. Note that Fatal_Error will still be set, so we
1711 -- will be able to check for this case below.
1713 if not GNATprove_Mode
then
1714 Ignore_Errors_Enable
:= Ignore_Errors_Enable
+ 1;
1719 (Load_Name
=> Subunit_Name
,
1720 Required
=> GNATprove_Mode
,
1724 if not GNATprove_Mode
then
1725 Ignore_Errors_Enable
:= Ignore_Errors_Enable
- 1;
1728 -- All done if we successfully loaded the subunit
1731 and then (Fatal_Error
(Unum
) /= Error_Detected
1732 or else Try_Semantics
)
1734 Comp_Unit
:= Cunit
(Unum
);
1736 -- If the file was empty or seriously mangled, the unit itself may
1739 if No
(Unit
(Comp_Unit
)) then
1741 ("subunit does not contain expected proper body", N
);
1743 elsif Nkind
(Unit
(Comp_Unit
)) /= N_Subunit
then
1745 ("expected SEPARATE subunit, found child unit",
1746 Cunit_Entity
(Unum
));
1748 Set_Corresponding_Stub
(Unit
(Comp_Unit
), N
);
1749 Analyze_Subunit
(Comp_Unit
);
1750 Set_Library_Unit
(N
, Comp_Unit
);
1751 Set_Corresponding_Body
(N
, Defining_Entity
(Unit
(Comp_Unit
)));
1754 elsif Unum
= No_Unit
1755 and then Present
(Nam
)
1757 if Is_Protected_Type
(Nam
) then
1758 Set_Corresponding_Body
(Parent
(Nam
), Defining_Identifier
(N
));
1760 Set_Corresponding_Body
(
1761 Unit_Declaration_Node
(Nam
), Defining_Identifier
(N
));
1764 end Optional_Subunit
;
1768 Comp_Unit
: Node_Id
;
1769 Unum
: Unit_Number_Type
;
1771 -- Start of processing for Analyze_Proper_Body
1774 -- If the subunit is already loaded, it means that the main unit is a
1775 -- subunit, and that the current unit is one of its parents which was
1776 -- being analyzed to provide the needed context for the analysis of the
1777 -- subunit. In this case we analyze the subunit and continue with the
1778 -- parent, without looking at subsequent subunits.
1780 if Is_Loaded
(Subunit_Name
) then
1782 -- If the proper body is already linked to the stub node, the stub is
1783 -- in a generic unit and just needs analyzing.
1785 if Present
(Library_Unit
(N
)) then
1786 Set_Corresponding_Stub
(Unit
(Library_Unit
(N
)), N
);
1788 -- If the subunit has severe errors, the spec of the enclosing
1789 -- body may not be available, in which case do not try analysis.
1791 if Serious_Errors_Detected
> 0
1792 and then No
(Library_Unit
(Library_Unit
(N
)))
1797 -- Collect SCO information for loaded subunit if we are in the
1798 -- extended main unit.
1801 and then In_Extended_Main_Source_Unit
1802 (Cunit_Entity
(Current_Sem_Unit
))
1804 SCO_Record_Raw
(Get_Cunit_Unit_Number
(Library_Unit
(N
)));
1807 Analyze_Subunit
(Library_Unit
(N
));
1809 -- Otherwise we must load the subunit and link to it
1812 -- Load the subunit, this must work, since we originally loaded
1813 -- the subunit earlier on. So this will not really load it, just
1814 -- give access to it.
1818 (Load_Name
=> Subunit_Name
,
1823 -- And analyze the subunit in the parent context (note that we
1824 -- do not call Semantics, since that would remove the parent
1825 -- context). Because of this, we have to manually reset the
1826 -- compiler state to Analyzing since it got destroyed by Load.
1828 if Unum
/= No_Unit
then
1829 Compiler_State
:= Analyzing
;
1831 -- Check that the proper body is a subunit and not a child
1832 -- unit. If the unit was previously loaded, the error will
1833 -- have been emitted when copying the generic node, so we
1834 -- just return to avoid cascaded errors.
1836 if Nkind
(Unit
(Cunit
(Unum
))) /= N_Subunit
then
1840 Set_Corresponding_Stub
(Unit
(Cunit
(Unum
)), N
);
1841 Analyze_Subunit
(Cunit
(Unum
));
1842 Set_Library_Unit
(N
, Cunit
(Unum
));
1846 -- If the main unit is a subunit, then we are just performing semantic
1847 -- analysis on that subunit, and any other subunits of any parent unit
1848 -- should be ignored. If the main unit is itself a subunit, another
1849 -- subunit is irrelevant unless it is a subunit of the current one, that
1850 -- is to say appears in the current source tree.
1852 elsif Nkind
(Unit
(Cunit
(Main_Unit
))) = N_Subunit
1853 and then Subunit_Name
/= Unit_Name
(Main_Unit
)
1855 -- But before we return, set the flag for unloaded subunits. This
1856 -- will suppress junk warnings of variables in the same declarative
1857 -- part (or a higher level one) that are in danger of looking unused
1858 -- when in fact there might be a declaration in the subunit that we
1859 -- do not intend to load.
1861 Unloaded_Subunits
:= True;
1864 -- If the subunit is not already loaded, and we are generating code,
1865 -- then this is the case where compilation started from the parent, and
1866 -- we are generating code for an entire subunit tree. In that case we
1867 -- definitely need to load the subunit.
1869 -- In order to continue the analysis with the rest of the parent,
1870 -- and other subunits, we load the unit without requiring its
1871 -- presence, and emit a warning if not found, rather than terminating
1872 -- the compilation abruptly, as for other missing file problems.
1874 elsif Original_Operating_Mode
= Generate_Code
then
1876 -- If the proper body is already linked to the stub node, the stub is
1877 -- in a generic unit and just needs analyzing.
1879 -- We update the version. Although we are not strictly technically
1880 -- semantically dependent on the subunit, given our approach of macro
1881 -- substitution of subunits, it makes sense to include it in the
1882 -- version identification.
1884 if Present
(Library_Unit
(N
)) then
1885 Set_Corresponding_Stub
(Unit
(Library_Unit
(N
)), N
);
1886 Analyze_Subunit
(Library_Unit
(N
));
1887 Version_Update
(Cunit
(Main_Unit
), Library_Unit
(N
));
1889 -- Otherwise we must load the subunit and link to it
1892 -- Make sure that, if the subunit is preprocessed and -gnateG is
1893 -- specified, the preprocessed file will be written.
1895 Lib
.Analysing_Subunit_Of_Main
:= True;
1898 (Load_Name
=> Subunit_Name
,
1902 Lib
.Analysing_Subunit_Of_Main
:= False;
1904 -- Give message if we did not get the unit Emit warning even if
1905 -- missing subunit is not within main unit, to simplify debugging.
1907 pragma Assert
(Original_Operating_Mode
= Generate_Code
);
1908 if Unum
= No_Unit
then
1909 Error_Msg_Unit_1
:= Subunit_Name
;
1911 Get_File_Name
(Subunit_Name
, Subunit
=> True);
1913 ("subunit$$ in file{ not found??!!", N
);
1914 Subunits_Missing
:= True;
1917 -- Load_Unit may reset Compiler_State, since it may have been
1918 -- necessary to parse an additional units, so we make sure that
1919 -- we reset it to the Analyzing state.
1921 Compiler_State
:= Analyzing
;
1923 if Unum
/= No_Unit
then
1924 if Debug_Flag_L
then
1925 Write_Str
("*** Loaded subunit from stub. Analyze");
1929 Comp_Unit
:= Cunit
(Unum
);
1931 -- Check for child unit instead of subunit
1933 if Nkind
(Unit
(Comp_Unit
)) /= N_Subunit
then
1935 ("expected SEPARATE subunit, found child unit",
1936 Cunit_Entity
(Unum
));
1938 -- OK, we have a subunit
1941 Set_Corresponding_Stub
(Unit
(Comp_Unit
), N
);
1942 Set_Library_Unit
(N
, Comp_Unit
);
1944 -- We update the version. Although we are not technically
1945 -- semantically dependent on the subunit, given our approach
1946 -- of macro substitution of subunits, it makes sense to
1947 -- include it in the version identification.
1949 Version_Update
(Cunit
(Main_Unit
), Comp_Unit
);
1951 -- Collect SCO information for loaded subunit if we are in
1952 -- the extended main unit.
1955 and then In_Extended_Main_Source_Unit
1956 (Cunit_Entity
(Current_Sem_Unit
))
1958 SCO_Record_Raw
(Unum
);
1961 -- Analyze the unit if semantics active
1963 if Fatal_Error
(Unum
) /= Error_Detected
1964 or else Try_Semantics
1966 Analyze_Subunit
(Comp_Unit
);
1972 -- The remaining case is when the subunit is not already loaded and we
1973 -- are not generating code. In this case we are just performing semantic
1974 -- analysis on the parent, and we are not interested in the subunit. For
1975 -- subprograms, analyze the stub as a body. For other entities the stub
1976 -- has already been marked as completed.
1981 end Analyze_Proper_Body
;
1983 ----------------------------------
1984 -- Analyze_Protected_Body_Stub --
1985 ----------------------------------
1987 procedure Analyze_Protected_Body_Stub
(N
: Node_Id
) is
1988 Id
: constant Entity_Id
:= Defining_Entity
(N
);
1989 Nam
: Entity_Id
:= Current_Entity_In_Scope
(Id
);
1990 Opts
: Config_Switches_Type
;
1993 Check_Stub_Level
(N
);
1995 -- First occurrence of name may have been as an incomplete type
1997 if Present
(Nam
) and then Ekind
(Nam
) = E_Incomplete_Type
then
1998 Nam
:= Full_View
(Nam
);
2001 if No
(Nam
) or else not Is_Protected_Type
(Etype
(Nam
)) then
2002 Error_Msg_N
("missing specification for Protected body", N
);
2005 -- Retain and restore the configuration options of the enclosing
2006 -- context as the proper body may introduce a set of its own.
2008 Opts
:= Save_Config_Switches
;
2010 Set_Scope
(Id
, Current_Scope
);
2011 Mutate_Ekind
(Id
, E_Protected_Body
);
2012 Set_Etype
(Id
, Standard_Void_Type
);
2014 if Has_Aspects
(N
) then
2015 Analyze_Aspect_Specifications
(N
, Id
);
2018 Set_Has_Completion
(Etype
(Nam
));
2019 Set_Corresponding_Spec_Of_Stub
(N
, Nam
);
2020 Generate_Reference
(Nam
, Id
, 'b');
2021 Analyze_Proper_Body
(N
, Etype
(Nam
));
2023 Restore_Config_Switches
(Opts
);
2025 end Analyze_Protected_Body_Stub
;
2027 ----------------------------------
2028 -- Analyze_Subprogram_Body_Stub --
2029 ----------------------------------
2031 -- A subprogram body stub can appear with or without a previous spec. If
2032 -- there is one, then the analysis of the body will find it and verify
2033 -- conformance. The formals appearing in the specification of the stub play
2034 -- no role, except for requiring an additional conformance check. If there
2035 -- is no previous subprogram declaration, the stub acts as a spec, and
2036 -- provides the defining entity for the subprogram.
2038 procedure Analyze_Subprogram_Body_Stub
(N
: Node_Id
) is
2040 Opts
: Config_Switches_Type
;
2043 Check_Stub_Level
(N
);
2045 -- Verify that the identifier for the stub is unique within this
2046 -- declarative part.
2048 if Nkind
(Parent
(N
)) in
2049 N_Block_Statement | N_Package_Body | N_Subprogram_Body
2051 Decl
:= First
(Declarations
(Parent
(N
)));
2052 while Present
(Decl
) and then Decl
/= N
loop
2053 if Nkind
(Decl
) = N_Subprogram_Body_Stub
2054 and then (Chars
(Defining_Unit_Name
(Specification
(Decl
))) =
2055 Chars
(Defining_Unit_Name
(Specification
(N
))))
2057 Error_Msg_N
("identifier for stub is not unique", N
);
2064 -- Retain and restore the configuration options of the enclosing context
2065 -- as the proper body may introduce a set of its own.
2067 Opts
:= Save_Config_Switches
;
2069 -- Treat stub as a body, which checks conformance if there is a previous
2070 -- declaration, or else introduces entity and its signature.
2072 Analyze_Subprogram_Body
(N
);
2073 Analyze_Proper_Body
(N
, Empty
);
2075 Restore_Config_Switches
(Opts
);
2076 end Analyze_Subprogram_Body_Stub
;
2078 ---------------------
2079 -- Analyze_Subunit --
2080 ---------------------
2082 -- A subunit is compiled either by itself (for semantic checking) or as
2083 -- part of compiling the parent (for code generation). In either case, by
2084 -- the time we actually process the subunit, the parent has already been
2085 -- installed and analyzed. The node N is a compilation unit, whose context
2086 -- needs to be treated here, because we come directly here from the parent
2087 -- without calling Analyze_Compilation_Unit.
2089 -- The compilation context includes the explicit context of the subunit,
2090 -- and the context of the parent, together with the parent itself. In order
2091 -- to compile the current context, we remove the one inherited from the
2092 -- parent, in order to have a clean visibility table. We restore the parent
2093 -- context before analyzing the proper body itself. On exit, we remove only
2094 -- the explicit context of the subunit.
2096 -- WARNING: This routine manages SPARK regions. Return statements must be
2097 -- replaced by gotos which jump to the end of the routine and restore the
2100 procedure Analyze_Subunit
(N
: Node_Id
) is
2101 Lib_Unit
: constant Node_Id
:= Library_Unit
(N
);
2102 Par_Unit
: constant Entity_Id
:= Current_Scope
;
2104 Lib_Spec
: Node_Id
:= Library_Unit
(Lib_Unit
);
2105 Num_Scopes
: Nat
:= 0;
2106 Use_Clauses
: array (1 .. Scope_Stack
.Last
) of Node_Id
;
2107 Enclosing_Child
: Entity_Id
:= Empty
;
2108 Svg
: constant Suppress_Record
:= Scope_Suppress
;
2110 Save_Cunit_Restrictions
: constant Save_Cunit_Boolean_Restrictions
:=
2111 Cunit_Boolean_Restrictions_Save
;
2112 -- Save non-partition wide restrictions before processing the subunit.
2113 -- All subunits are analyzed with config restrictions reset and we need
2114 -- to restore these saved values at the end.
2116 procedure Analyze_Subunit_Context
;
2117 -- Capture names in use clauses of the subunit. This must be done before
2118 -- re-installing parent declarations, because items in the context must
2119 -- not be hidden by declarations local to the parent.
2121 procedure Re_Install_Parents
(L
: Node_Id
; Scop
: Entity_Id
);
2122 -- Recursive procedure to restore scope of all ancestors of subunit,
2123 -- from outermost in. If parent is not a subunit, the call to install
2124 -- context installs context of spec and (if parent is a child unit) the
2125 -- context of its parents as well. It is confusing that parents should
2126 -- be treated differently in both cases, but the semantics are just not
2129 procedure Re_Install_Use_Clauses
;
2130 -- As part of the removal of the parent scope, the use clauses are
2131 -- removed, to be reinstalled when the context of the subunit has been
2132 -- analyzed. Use clauses may also have been affected by the analysis of
2133 -- the context of the subunit, so they have to be applied again, to
2134 -- insure that the compilation environment of the rest of the parent
2135 -- unit is identical.
2137 procedure Remove_Scope
;
2138 -- Remove current scope from scope stack, and preserve the list of use
2139 -- clauses in it, to be reinstalled after context is analyzed.
2141 -----------------------------
2142 -- Analyze_Subunit_Context --
2143 -----------------------------
2145 procedure Analyze_Subunit_Context
is
2147 Unit_Name
: Entity_Id
;
2150 Analyze_Context
(N
);
2151 Check_No_Elab_Code_All
(N
);
2153 -- Make withed units immediately visible. If child unit, make the
2154 -- ultimate parent immediately visible.
2156 Item
:= First
(Context_Items
(N
));
2157 while Present
(Item
) loop
2158 if Nkind
(Item
) = N_With_Clause
then
2160 -- Protect frontend against previous errors in context clauses
2162 if Nkind
(Name
(Item
)) /= N_Selected_Component
then
2163 if Error_Posted
(Item
) then
2167 -- If a subunits has serious syntax errors, the context
2168 -- may not have been loaded. Add a harmless unit name to
2169 -- attempt processing.
2171 if Serious_Errors_Detected
> 0
2172 and then No
(Entity
(Name
(Item
)))
2174 Set_Entity
(Name
(Item
), Standard_Standard
);
2177 Unit_Name
:= Entity
(Name
(Item
));
2179 Set_Is_Visible_Lib_Unit
(Unit_Name
);
2180 exit when Scope
(Unit_Name
) = Standard_Standard
;
2181 Unit_Name
:= Scope
(Unit_Name
);
2183 if No
(Unit_Name
) then
2184 Check_Error_Detected
;
2189 if not Is_Immediately_Visible
(Unit_Name
) then
2190 Set_Is_Immediately_Visible
(Unit_Name
);
2191 Set_Context_Installed
(Item
);
2196 elsif Nkind
(Item
) = N_Use_Package_Clause
then
2197 Analyze
(Name
(Item
));
2199 elsif Nkind
(Item
) = N_Use_Type_Clause
then
2200 Analyze
(Subtype_Mark
(Item
));
2206 -- Reset visibility of withed units. They will be made visible again
2207 -- when we install the subunit context.
2209 Item
:= First
(Context_Items
(N
));
2210 while Present
(Item
) loop
2211 if Nkind
(Item
) = N_With_Clause
2213 -- Protect frontend against previous errors in context clauses
2215 and then Nkind
(Name
(Item
)) /= N_Selected_Component
2216 and then not Error_Posted
(Item
)
2218 Unit_Name
:= Entity
(Name
(Item
));
2220 Set_Is_Visible_Lib_Unit
(Unit_Name
, False);
2221 exit when Scope
(Unit_Name
) = Standard_Standard
;
2222 Unit_Name
:= Scope
(Unit_Name
);
2225 if Context_Installed
(Item
) then
2226 Set_Is_Immediately_Visible
(Unit_Name
, False);
2227 Set_Context_Installed
(Item
, False);
2233 end Analyze_Subunit_Context
;
2235 ------------------------
2236 -- Re_Install_Parents --
2237 ------------------------
2239 procedure Re_Install_Parents
(L
: Node_Id
; Scop
: Entity_Id
) is
2243 if Nkind
(Unit
(L
)) = N_Subunit
then
2244 Re_Install_Parents
(Library_Unit
(L
), Scope
(Scop
));
2247 Install_Context
(L
, False);
2249 -- If the subunit occurs within a child unit, we must restore the
2250 -- immediate visibility of any siblings that may occur in context.
2251 -- In addition, we must reset the previous visibility of the
2252 -- parent unit which is now on the scope stack. This is because
2253 -- the Previous_Visibility was previously set when removing the
2254 -- context. This is necessary to prevent the parent entity from
2255 -- remaining visible after the subunit is compiled. This only
2256 -- has an effect if a homonym exists in a body to be processed
2257 -- later if inlining is enabled.
2259 if Present
(Enclosing_Child
) then
2260 Install_Siblings
(Enclosing_Child
, L
);
2261 Scope_Stack
.Table
(Scope_Stack
.Last
).Previous_Visibility
:=
2267 if Scop
/= Par_Unit
then
2268 Set_Is_Immediately_Visible
(Scop
);
2271 -- Make entities in scope visible again. For child units, restore
2272 -- visibility only if they are actually in context.
2274 E
:= First_Entity
(Current_Scope
);
2275 while Present
(E
) loop
2276 if not Is_Child_Unit
(E
) or else Is_Visible_Lib_Unit
(E
) then
2277 Set_Is_Immediately_Visible
(E
);
2283 -- A subunit appears within a body, and for a nested subunits all the
2284 -- parents are bodies. Restore full visibility of their private
2287 if Is_Package_Or_Generic_Package
(Scop
) then
2288 Set_In_Package_Body
(Scop
);
2289 Install_Private_Declarations
(Scop
);
2291 end Re_Install_Parents
;
2293 ----------------------------
2294 -- Re_Install_Use_Clauses --
2295 ----------------------------
2297 procedure Re_Install_Use_Clauses
is
2300 for J
in reverse 1 .. Num_Scopes
loop
2301 U
:= Use_Clauses
(J
);
2302 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:= U
;
2303 Install_Use_Clauses
(U
);
2305 end Re_Install_Use_Clauses
;
2311 procedure Remove_Scope
is
2315 Num_Scopes
:= Num_Scopes
+ 1;
2316 Use_Clauses
(Num_Scopes
) :=
2317 Scope_Stack
.Table
(Scope_Stack
.Last
).First_Use_Clause
;
2319 E
:= First_Entity
(Current_Scope
);
2320 while Present
(E
) loop
2321 Set_Is_Immediately_Visible
(E
, False);
2325 if Is_Child_Unit
(Current_Scope
) then
2326 Enclosing_Child
:= Current_Scope
;
2332 Saved_SM
: SPARK_Mode_Type
:= SPARK_Mode
;
2333 Saved_SMP
: Node_Id
:= SPARK_Mode_Pragma
;
2334 -- Save the SPARK mode-related data to restore on exit. Removing
2335 -- enclosing scopes and contexts to provide a clean environment for the
2336 -- context of the subunit will eliminate any previously set SPARK_Mode.
2338 -- Start of processing for Analyze_Subunit
2341 -- For subunit in main extended unit, we reset the configuration values
2342 -- for the non-partition-wide restrictions. For other units reset them.
2344 if In_Extended_Main_Source_Unit
(N
) then
2345 Restore_Config_Cunit_Boolean_Restrictions
;
2347 Reset_Cunit_Boolean_Restrictions
;
2352 Nam
: Node_Id
:= Name
(Unit
(N
));
2355 if Nkind
(Nam
) = N_Selected_Component
then
2356 Nam
:= Selector_Name
(Nam
);
2359 Check_Identifier
(Nam
, Par_Unit
);
2363 if not Is_Empty_List
(Context_Items
(N
)) then
2365 -- Save current use clauses
2368 Remove_Context
(Lib_Unit
);
2370 -- Now remove parents and their context, including enclosing subunits
2371 -- and the outer parent body which is not a subunit.
2373 if Present
(Lib_Spec
) then
2374 Remove_Context
(Lib_Spec
);
2376 while Nkind
(Unit
(Lib_Spec
)) = N_Subunit
loop
2377 Lib_Spec
:= Library_Unit
(Lib_Spec
);
2379 Remove_Context
(Lib_Spec
);
2382 if Nkind
(Unit
(Lib_Unit
)) = N_Subunit
then
2386 if Nkind
(Unit
(Lib_Spec
)) in N_Package_Body | N_Subprogram_Body
2388 Remove_Context
(Library_Unit
(Lib_Spec
));
2392 Set_Is_Immediately_Visible
(Par_Unit
, False);
2394 Analyze_Subunit_Context
;
2396 -- Take into account the effect of any SPARK_Mode configuration
2397 -- pragma, which takes precedence over a different value of
2398 -- SPARK_Mode inherited from the context of the stub.
2400 if SPARK_Mode
/= None
then
2401 Saved_SM
:= SPARK_Mode
;
2402 Saved_SMP
:= SPARK_Mode_Pragma
;
2405 Re_Install_Parents
(Lib_Unit
, Par_Unit
);
2406 Set_Is_Immediately_Visible
(Par_Unit
);
2408 -- If the context includes a child unit of the parent of the subunit,
2409 -- the parent will have been removed from visibility, after compiling
2410 -- that cousin in the context. The visibility of the parent must be
2411 -- restored now. This also applies if the context includes another
2412 -- subunit of the same parent which in turn includes a child unit in
2415 if Is_Package_Or_Generic_Package
(Par_Unit
) then
2416 if not Is_Immediately_Visible
(Par_Unit
)
2417 or else (Present
(First_Entity
(Par_Unit
))
2419 Is_Immediately_Visible
(First_Entity
(Par_Unit
)))
2421 Set_Is_Immediately_Visible
(Par_Unit
);
2422 Install_Visible_Declarations
(Par_Unit
);
2423 Install_Private_Declarations
(Par_Unit
);
2427 Re_Install_Use_Clauses
;
2428 Install_Context
(N
, Chain
=> False);
2430 -- Restore state of suppress flags for current body
2432 Scope_Suppress
:= Svg
;
2434 -- If the subunit is within a child unit, then siblings of any parent
2435 -- unit that appear in the context clause of the subunit must also be
2436 -- made immediately visible.
2438 if Present
(Enclosing_Child
) then
2439 Install_Siblings
(Enclosing_Child
, N
);
2443 Generate_Parent_References
(Unit
(N
), Par_Unit
);
2445 -- Reinstall the SPARK_Mode which was in effect prior to any scope and
2446 -- context manipulations, taking into account a possible SPARK_Mode
2447 -- configuration pragma if present.
2449 Install_SPARK_Mode
(Saved_SM
, Saved_SMP
);
2451 -- If the subunit is part of a compilation unit which is subject to
2452 -- pragma Elaboration_Checks, set the model specified by the pragma
2453 -- because it applies to all parts of the unit.
2455 Install_Elaboration_Model
(Par_Unit
);
2457 -- The syntax rules require a proper body for a subprogram subunit
2459 if Nkind
(Proper_Body
(Sinfo
.Nodes
.Unit
(N
))) = N_Subprogram_Declaration
2461 if Null_Present
(Specification
(Proper_Body
(Sinfo
.Nodes
.Unit
(N
))))
2464 ("null procedure not allowed as subunit",
2465 Proper_Body
(Unit
(N
)));
2468 ("subprogram declaration not allowed as subunit",
2469 Defining_Unit_Name
(Specification
(Proper_Body
(Unit
(N
)))));
2473 Analyze
(Proper_Body
(Unit
(N
)));
2476 -- The subunit may contain a with_clause on a sibling of some ancestor.
2477 -- Removing the context will remove from visibility those ancestor child
2478 -- units, which must be restored to the visibility they have in the
2481 if Present
(Enclosing_Child
) then
2486 while Present
(C
) and then C
/= Standard_Standard
loop
2487 Set_Is_Immediately_Visible
(C
);
2488 Set_Is_Visible_Lib_Unit
(C
);
2494 -- Deal with restore of restrictions
2496 Cunit_Boolean_Restrictions_Restore
(Save_Cunit_Restrictions
);
2497 end Analyze_Subunit
;
2499 ----------------------------
2500 -- Analyze_Task_Body_Stub --
2501 ----------------------------
2503 procedure Analyze_Task_Body_Stub
(N
: Node_Id
) is
2504 Id
: constant Entity_Id
:= Defining_Entity
(N
);
2505 Loc
: constant Source_Ptr
:= Sloc
(N
);
2506 Nam
: Entity_Id
:= Current_Entity_In_Scope
(Id
);
2509 Check_Stub_Level
(N
);
2511 -- First occurrence of name may have been as an incomplete type
2513 if Present
(Nam
) and then Ekind
(Nam
) = E_Incomplete_Type
then
2514 Nam
:= Full_View
(Nam
);
2517 if No
(Nam
) or else not Is_Task_Type
(Etype
(Nam
)) then
2518 Error_Msg_N
("missing specification for task body", N
);
2521 Set_Scope
(Id
, Current_Scope
);
2522 Mutate_Ekind
(Id
, E_Task_Body
);
2523 Set_Etype
(Id
, Standard_Void_Type
);
2525 if Has_Aspects
(N
) then
2526 Analyze_Aspect_Specifications
(N
, Id
);
2529 Generate_Reference
(Nam
, Id
, 'b');
2530 Set_Corresponding_Spec_Of_Stub
(N
, Nam
);
2532 -- Check for duplicate stub, if so give message and terminate
2534 if Has_Completion
(Etype
(Nam
)) then
2535 Error_Msg_N
("duplicate stub for task", N
);
2538 Set_Has_Completion
(Etype
(Nam
));
2541 Analyze_Proper_Body
(N
, Etype
(Nam
));
2543 -- Set elaboration flag to indicate that entity is callable. This
2544 -- cannot be done in the expansion of the body itself, because the
2545 -- proper body is not in a declarative part. This is only done if
2546 -- expansion is active, because the context may be generic and the
2547 -- flag not defined yet.
2549 if Expander_Active
then
2551 Make_Assignment_Statement
(Loc
,
2553 Make_Identifier
(Loc
,
2554 Chars
=> New_External_Name
(Chars
(Etype
(Nam
)), 'E')),
2555 Expression
=> New_Occurrence_Of
(Standard_True
, Loc
)));
2558 end Analyze_Task_Body_Stub
;
2560 -------------------------
2561 -- Analyze_With_Clause --
2562 -------------------------
2564 -- Analyze the declaration of a unit in a with clause. At end, label the
2565 -- with clause with the defining entity for the unit.
2567 procedure Analyze_With_Clause
(N
: Node_Id
) is
2569 -- Retrieve the original kind of the unit node, before analysis. If it
2570 -- is a subprogram instantiation, its analysis below will rewrite the
2571 -- node as the declaration of the wrapper package. If the same
2572 -- instantiation appears indirectly elsewhere in the context, it will
2573 -- have been analyzed already.
2575 Unit_Kind
: constant Node_Kind
:=
2576 Nkind
(Original_Node
(Unit
(Library_Unit
(N
))));
2577 Nam
: constant Node_Id
:= Name
(N
);
2579 Par_Name
: Entity_Id
;
2584 -- Set True if the unit currently being compiled is an internal unit
2586 Restriction_Violation
: Boolean := False;
2587 -- Set True if a with violates a restriction, no point in giving any
2588 -- warnings if we have this definite error.
2590 Save_Style_Check
: constant Boolean := Opt
.Style_Check
;
2593 U
:= Unit
(Library_Unit
(N
));
2595 -- If this is an internal unit which is a renaming, then this is a
2596 -- violation of No_Obsolescent_Features.
2598 -- Note: this is not quite right if the user defines one of these units
2599 -- himself, but that's a marginal case, and fixing it is hard ???
2601 if Ada_Version
>= Ada_95
2602 and then In_Predefined_Renaming
(U
)
2604 if Restriction_Check_Required
(No_Obsolescent_Features
) then
2605 Check_Restriction
(No_Obsolescent_Features
, N
);
2606 Restriction_Violation
:= True;
2609 if Warn_On_Obsolescent_Feature
then
2611 ("renamed predefined unit is an obsolescent feature "
2612 & "(RM J.1)?j?", N
);
2616 -- Check No_Implementation_Units violation
2618 if Restriction_Check_Required
(No_Implementation_Units
) then
2619 if Not_Impl_Defined_Unit
(Get_Source_Unit
(U
)) then
2622 Check_Restriction
(No_Implementation_Units
, Nam
);
2623 Restriction_Violation
:= True;
2627 -- Several actions are skipped for dummy packages (those supplied for
2628 -- with's where no matching file could be found). Such packages are
2629 -- identified by the Sloc value being set to No_Location.
2631 if Limited_Present
(N
) then
2633 -- Ada 2005 (AI-50217): Build visibility structures but do not
2634 -- analyze the unit.
2636 -- If the designated unit is a predefined unit, which might be used
2637 -- implicitly through the rtsfind machinery, a limited with clause
2638 -- on such a unit is usually pointless, because run-time units are
2639 -- unlikely to appear in mutually dependent units, and because this
2640 -- disables the rtsfind mechanism. We transform such limited with
2641 -- clauses into regular with clauses.
2643 if Sloc
(U
) /= No_Location
then
2644 if In_Predefined_Unit
(U
) then
2645 Set_Limited_Present
(N
, False);
2646 Analyze_With_Clause
(N
);
2648 Build_Limited_Views
(N
);
2655 -- If we are compiling under "don't quit" mode (-gnatq) and we have
2656 -- already detected serious errors then we mark the with-clause nodes as
2657 -- analyzed before the corresponding compilation unit is analyzed. This
2658 -- is done here to protect the frontend against never ending recursion
2659 -- caused by circularities in the sources (because the previous errors
2660 -- may break the regular machine of the compiler implemented in
2661 -- Load_Unit to detect circularities).
2663 if Serious_Errors_Detected
> 0 and then Try_Semantics
then
2667 Semantics
(Library_Unit
(N
));
2669 Intunit
:= Is_Internal_Unit
(Current_Sem_Unit
);
2671 if Sloc
(U
) /= No_Location
then
2673 -- Check restrictions, except that we skip the check if this is an
2674 -- internal unit unless we are compiling the internal unit as the
2675 -- main unit. We also skip this for dummy packages.
2677 Check_Restriction_No_Dependence
(Nam
, N
);
2679 if not Intunit
or else Current_Sem_Unit
= Main_Unit
then
2680 Check_Restricted_Unit
(Unit_Name
(Get_Source_Unit
(U
)), N
);
2683 -- Deal with special case of GNAT.Current_Exceptions which interacts
2684 -- with the optimization of local raise statements into gotos.
2686 if Nkind
(Nam
) = N_Selected_Component
2687 and then Nkind
(Prefix
(Nam
)) = N_Identifier
2688 and then Chars
(Prefix
(Nam
)) = Name_Gnat
2689 and then Chars
(Selector_Name
(Nam
))
2690 in Name_Most_Recent_Exception | Name_Exception_Traces
2692 Check_Restriction
(No_Exception_Propagation
, N
);
2693 Special_Exception_Package_Used
:= True;
2696 -- Check for inappropriate with of internal implementation unit if we
2697 -- are not compiling an internal unit and also check for withing unit
2698 -- in wrong version of Ada. Do not issue these messages for implicit
2699 -- with's generated by the compiler itself.
2701 if Implementation_Unit_Warnings
2702 and then not Intunit
2703 and then not Implicit_With
(N
)
2704 and then not Restriction_Violation
2706 case Get_Kind_Of_Unit
(Get_Source_Unit
(U
)) is
2707 when Implementation_Unit
=>
2708 Error_Msg_F
("& is an internal 'G'N'A'T unit?i?", Name
(N
));
2710 -- Add alternative name if available, otherwise issue a
2711 -- general warning message.
2713 if Error_Msg_Strlen
/= 0 then
2714 Error_Msg_F
("\use ""~"" instead?i?", Name
(N
));
2717 ("\use of this unit is non-portable and "
2718 & "version-dependent?i?", Name
(N
));
2721 when Not_Predefined_Unit | Ada_95_Unit
=>
2722 null; -- no checks needed
2724 when Ada_2005_Unit
=>
2725 if Ada_Version
< Ada_2005
2726 and then Warn_On_Ada_2005_Compatibility
2728 Error_Msg_N
("& is an Ada 2005 unit?i?", Name
(N
));
2731 when Ada_2012_Unit
=>
2732 if Ada_Version
< Ada_2012
2733 and then Warn_On_Ada_2012_Compatibility
2735 Error_Msg_N
("& is an Ada 2012 unit?i?", Name
(N
));
2738 when Ada_2022_Unit
=>
2739 if Ada_Version
< Ada_2022
2740 and then Warn_On_Ada_2022_Compatibility
2742 Error_Msg_N
("& is an Ada 2022 unit?i?", Name
(N
));
2748 -- Semantic analysis of a generic unit is performed on a copy of
2749 -- the original tree. Retrieve the entity on which semantic info
2750 -- actually appears.
2752 if Unit_Kind
in N_Generic_Declaration
then
2753 E_Name
:= Defining_Entity
(U
);
2755 -- Note: in the following test, Unit_Kind is the original Nkind, but in
2756 -- the case of an instantiation, semantic analysis above will have
2757 -- replaced the unit by its instantiated version. If the instance body
2758 -- has been generated, the instance now denotes the body entity. For
2759 -- visibility purposes we need the entity of its spec.
2761 elsif (Unit_Kind
= N_Package_Instantiation
2762 or else Nkind
(Original_Node
(Unit
(Library_Unit
(N
)))) =
2763 N_Package_Instantiation
)
2764 and then Nkind
(U
) = N_Package_Body
2766 E_Name
:= Corresponding_Spec
(U
);
2768 elsif Unit_Kind
= N_Package_Instantiation
2769 and then Nkind
(U
) = N_Package_Instantiation
2770 and then Present
(Instance_Spec
(U
))
2772 -- If the instance has not been rewritten as a package declaration,
2773 -- then it appeared already in a previous with clause. Retrieve
2774 -- the entity from the previous instance.
2776 E_Name
:= Defining_Entity
(Specification
(Instance_Spec
(U
)));
2778 elsif Unit_Kind
in N_Subprogram_Instantiation
then
2780 -- The visible subprogram is created during instantiation, and is
2781 -- an attribute of the wrapper package. We retrieve the wrapper
2782 -- package directly from the instantiation node. If the instance
2783 -- is inlined the unit is still an instantiation. Otherwise it has
2784 -- been rewritten as the declaration of the wrapper itself.
2786 if Nkind
(U
) in N_Subprogram_Instantiation
then
2789 (Defining_Entity
(Specification
(Instance_Spec
(U
))));
2791 E_Name
:= Related_Instance
(Defining_Entity
(U
));
2794 elsif Unit_Kind
= N_Package_Renaming_Declaration
2795 or else Unit_Kind
in N_Generic_Renaming_Declaration
2797 E_Name
:= Defining_Entity
(U
);
2799 elsif Unit_Kind
= N_Subprogram_Body
2800 and then Nkind
(Name
(N
)) = N_Selected_Component
2801 and then not Acts_As_Spec
(Library_Unit
(N
))
2803 -- For a child unit that has no spec, one has been created and
2804 -- analyzed. The entity required is that of the spec.
2806 E_Name
:= Corresponding_Spec
(U
);
2809 E_Name
:= Defining_Entity
(U
);
2812 if Nkind
(Name
(N
)) = N_Selected_Component
then
2814 -- Child unit in a with clause
2816 Change_Selected_Component_To_Expanded_Name
(Name
(N
));
2818 -- If this is a child unit without a spec, and it has been analyzed
2819 -- already, a declaration has been created for it. The with_clause
2820 -- must reflect the actual body, and not the generated declaration,
2821 -- to prevent spurious binding errors involving an out-of-date spec.
2822 -- Note that this can only happen if the unit includes more than one
2823 -- with_clause for the child unit (e.g. in separate subunits).
2825 if Unit_Kind
= N_Subprogram_Declaration
2826 and then Analyzed
(Library_Unit
(N
))
2827 and then not Comes_From_Source
(Library_Unit
(N
))
2829 Set_Library_Unit
(N
,
2830 Cunit
(Get_Source_Unit
(Corresponding_Body
(U
))));
2834 -- Restore style checks
2836 Style_Check
:= Save_Style_Check
;
2838 -- Record the reference, but do NOT set the unit as referenced, we want
2839 -- to consider the unit as unreferenced if this is the only reference
2842 Set_Entity_With_Checks
(Name
(N
), E_Name
);
2843 Generate_Reference
(E_Name
, Name
(N
), 'w', Set_Ref
=> False);
2845 -- Generate references and check No_Dependence restriction for parents
2847 if Is_Child_Unit
(E_Name
) then
2848 Pref
:= Prefix
(Name
(N
));
2849 Par_Name
:= Scope
(E_Name
);
2850 while Nkind
(Pref
) = N_Selected_Component
loop
2851 Change_Selected_Component_To_Expanded_Name
(Pref
);
2853 if Present
(Entity
(Selector_Name
(Pref
)))
2855 Present
(Renamed_Entity
(Entity
(Selector_Name
(Pref
))))
2856 and then Entity
(Selector_Name
(Pref
)) /= Par_Name
2858 -- The prefix is a child unit that denotes a renaming declaration.
2859 -- Replace the prefix directly with the renamed unit, because the
2860 -- rest of the prefix is irrelevant to the visibility of the real
2863 Rewrite
(Pref
, New_Occurrence_Of
(Par_Name
, Sloc
(Pref
)));
2867 Set_Entity_With_Checks
(Pref
, Par_Name
);
2869 Generate_Reference
(Par_Name
, Pref
);
2870 Check_Restriction_No_Dependence
(Pref
, N
);
2871 Pref
:= Prefix
(Pref
);
2873 -- If E_Name is the dummy entity for a nonexistent unit, its scope
2874 -- is set to Standard_Standard, and no attempt should be made to
2875 -- further unwind scopes.
2877 if Par_Name
/= Standard_Standard
then
2878 Par_Name
:= Scope
(Par_Name
);
2881 -- Abandon processing in case of previous errors
2883 if No
(Par_Name
) then
2884 Check_Error_Detected
;
2889 if Present
(Entity
(Pref
))
2890 and then not Analyzed
(Parent
(Parent
(Entity
(Pref
))))
2892 -- If the entity is set without its unit being compiled, the
2893 -- original parent is a renaming, and Par_Name is the renamed
2894 -- entity. For visibility purposes, we need the original entity,
2895 -- which must be analyzed now because Load_Unit directly retrieves
2896 -- the renamed unit, and the renaming declaration itself has not
2899 Analyze
(Parent
(Parent
(Entity
(Pref
))));
2900 pragma Assert
(Renamed_Entity
(Entity
(Pref
)) = Par_Name
);
2901 Par_Name
:= Entity
(Pref
);
2904 -- Guard against missing or misspelled child units
2906 if Present
(Par_Name
) then
2907 Set_Entity_With_Checks
(Pref
, Par_Name
);
2908 Generate_Reference
(Par_Name
, Pref
);
2911 pragma Assert
(Serious_Errors_Detected
/= 0);
2913 -- Mark the node to indicate that a related error has been posted.
2914 -- This defends further compilation passes against improper use of
2915 -- the invalid WITH clause node.
2917 Set_Error_Posted
(N
);
2918 Set_Name
(N
, Error
);
2923 -- If the withed unit is System, and a system extension pragma is
2924 -- present, compile the extension now, rather than waiting for a
2925 -- visibility check on a specific entity.
2927 if Chars
(E_Name
) = Name_System
2928 and then Scope
(E_Name
) = Standard_Standard
2929 and then Present
(System_Extend_Unit
)
2930 and then Present_System_Aux
(N
)
2932 -- If the extension is not present, an error will have been emitted
2937 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
2938 -- to private_with units; they will be made visible later (just before
2939 -- the private part is analyzed)
2941 if Private_Present
(N
) then
2942 Set_Is_Immediately_Visible
(E_Name
, False);
2945 -- Propagate Fatal_Error setting from with'ed unit to current unit
2947 case Fatal_Error
(Get_Source_Unit
(Library_Unit
(N
))) is
2949 -- Nothing to do if with'ed unit had no error
2954 -- If with'ed unit had a detected fatal error, propagate it
2956 when Error_Detected
=>
2957 Set_Fatal_Error
(Current_Sem_Unit
, Error_Detected
);
2959 -- If with'ed unit had an ignored error, then propagate it but do not
2960 -- overide an existring setting.
2962 when Error_Ignored
=>
2963 if Fatal_Error
(Current_Sem_Unit
) = None
then
2964 Set_Fatal_Error
(Current_Sem_Unit
, Error_Ignored
);
2967 end Analyze_With_Clause
;
2969 ------------------------------
2970 -- Check_Private_Child_Unit --
2971 ------------------------------
2973 procedure Check_Private_Child_Unit
(N
: Node_Id
) is
2974 Lib_Unit
: constant Node_Id
:= Unit
(N
);
2976 Curr_Unit
: Entity_Id
;
2977 Sub_Parent
: Node_Id
;
2978 Priv_Child
: Entity_Id
;
2979 Par_Lib
: Entity_Id
;
2983 if Nkind
(Lib_Unit
) in N_Package_Body | N_Subprogram_Body
then
2984 Curr_Unit
:= Defining_Entity
(Unit
(Library_Unit
(N
)));
2985 Par_Lib
:= Curr_Unit
;
2987 elsif Nkind
(Lib_Unit
) = N_Subunit
then
2989 -- The parent is itself a body. The parent entity is to be found in
2990 -- the corresponding spec.
2992 Sub_Parent
:= Library_Unit
(N
);
2993 Curr_Unit
:= Defining_Entity
(Unit
(Library_Unit
(Sub_Parent
)));
2995 -- If the parent itself is a subunit, Curr_Unit is the entity of the
2996 -- enclosing body, retrieve the spec entity which is the proper
2997 -- ancestor we need for the following tests.
2999 if Ekind
(Curr_Unit
) = E_Package_Body
then
3000 Curr_Unit
:= Spec_Entity
(Curr_Unit
);
3003 Par_Lib
:= Curr_Unit
;
3006 Curr_Unit
:= Defining_Entity
(Lib_Unit
);
3008 Par_Lib
:= Curr_Unit
;
3009 Par_Spec
:= Parent_Spec
(Lib_Unit
);
3011 if No
(Par_Spec
) then
3014 Par_Lib
:= Defining_Entity
(Unit
(Par_Spec
));
3018 -- Loop through context items
3020 Item
:= First
(Context_Items
(N
));
3021 while Present
(Item
) loop
3023 -- Ada 2005 (AI-262): Allow private_with of a private child package
3024 -- in public siblings
3026 if Nkind
(Item
) = N_With_Clause
3027 and then not Implicit_With
(Item
)
3028 and then not Limited_Present
(Item
)
3029 and then Is_Private_Descendant
(Entity
(Name
(Item
)))
3031 Priv_Child
:= Entity
(Name
(Item
));
3034 Curr_Parent
: Entity_Id
:= Par_Lib
;
3035 Child_Parent
: Entity_Id
:= Scope
(Priv_Child
);
3036 Prv_Ancestor
: Entity_Id
:= Child_Parent
;
3037 Curr_Private
: Boolean := Is_Private_Library_Unit
(Curr_Unit
);
3040 -- If the child unit is a public child then locate the nearest
3041 -- private ancestor. Child_Parent will then be set to the
3042 -- parent of that ancestor.
3044 if not Is_Private_Library_Unit
(Priv_Child
) then
3045 while Present
(Prv_Ancestor
)
3046 and then not Is_Private_Library_Unit
(Prv_Ancestor
)
3048 Prv_Ancestor
:= Scope
(Prv_Ancestor
);
3051 if Present
(Prv_Ancestor
) then
3052 Child_Parent
:= Scope
(Prv_Ancestor
);
3056 while Present
(Curr_Parent
)
3057 and then Curr_Parent
/= Standard_Standard
3058 and then Curr_Parent
/= Child_Parent
3061 Curr_Private
or else Is_Private_Library_Unit
(Curr_Parent
);
3062 Curr_Parent
:= Scope
(Curr_Parent
);
3065 if No
(Curr_Parent
) then
3066 Curr_Parent
:= Standard_Standard
;
3069 if Curr_Parent
/= Child_Parent
then
3070 if Ekind
(Priv_Child
) = E_Generic_Package
3071 and then Chars
(Priv_Child
) in Text_IO_Package_Name
3072 and then Chars
(Scope
(Scope
(Priv_Child
))) = Name_Ada
3073 and then Scope
(Scope
(Scope
(Priv_Child
))) =
3077 ("& is a nested package, not a compilation unit",
3078 Name
(Item
), Priv_Child
);
3082 ("unit in with clause is private child unit!", Item
);
3084 ("\current unit must also have parent&!",
3085 Item
, Child_Parent
);
3089 or else Private_Present
(Item
)
3090 or else Nkind
(Lib_Unit
) in N_Package_Body | N_Subunit
3091 or else (Nkind
(Lib_Unit
) = N_Subprogram_Body
3092 and then not Acts_As_Spec
(Parent
(Lib_Unit
)))
3098 ("current unit must also be private descendant of&",
3099 Item
, Child_Parent
);
3106 end Check_Private_Child_Unit
;
3108 ----------------------
3109 -- Check_Stub_Level --
3110 ----------------------
3112 procedure Check_Stub_Level
(N
: Node_Id
) is
3113 Par
: constant Node_Id
:= Parent
(N
);
3114 Kind
: constant Node_Kind
:= Nkind
(Par
);
3118 N_Package_Body | N_Subprogram_Body | N_Task_Body | N_Protected_Body
3119 and then Nkind
(Parent
(Par
)) in N_Compilation_Unit | N_Subunit
3123 -- In an instance, a missing stub appears at any level. A warning
3124 -- message will have been emitted already for the missing file.
3126 elsif not In_Instance
then
3127 Error_Msg_N
("stub cannot appear in an inner scope", N
);
3129 elsif Expander_Active
then
3130 Error_Msg_N
("missing proper body", N
);
3132 end Check_Stub_Level
;
3138 procedure Decorate_Type
3141 Is_Tagged
: Boolean := False;
3142 Materialize
: Boolean := False)
3147 -- An unanalyzed type or a shadow entity of a type is treated as an
3148 -- incomplete type, and carries the corresponding attributes.
3150 Mutate_Ekind
(Ent
, E_Incomplete_Type
);
3151 Set_Etype
(Ent
, Ent
);
3152 Set_Full_View
(Ent
, Empty
);
3153 Set_Is_First_Subtype
(Ent
);
3154 Set_Scope
(Ent
, Scop
);
3155 Set_Stored_Constraint
(Ent
, No_Elist
);
3156 Reinit_Size_Align
(Ent
);
3158 if From_Limited_With
(Ent
) then
3159 Set_Private_Dependents
(Ent
, New_Elmt_List
);
3162 -- A tagged type and its corresponding shadow entity share one common
3163 -- class-wide type. The list of primitive operations for the shadow
3167 Set_Is_Tagged_Type
(Ent
);
3168 Set_Direct_Primitive_Operations
(Ent
, New_Elmt_List
);
3172 (E_Void
, Scope
(Ent
), Sloc
(Ent
), Ent
, 'C', 0, 'T');
3174 Set_Class_Wide_Type
(Ent
, CW_Typ
);
3176 -- Set parent to be the same as the parent of the tagged type.
3177 -- We need a parent field set, and it is supposed to point to
3178 -- the declaration of the type. The tagged type declaration
3179 -- essentially declares two separate types, the tagged type
3180 -- itself and the corresponding class-wide type, so it is
3181 -- reasonable for the parent fields to point to the declaration
3184 Set_Parent
(CW_Typ
, Parent
(Ent
));
3186 Mutate_Ekind
(CW_Typ
, E_Class_Wide_Type
);
3187 Set_Class_Wide_Type
(CW_Typ
, CW_Typ
);
3188 Set_Etype
(CW_Typ
, Ent
);
3189 Set_Equivalent_Type
(CW_Typ
, Empty
);
3190 Set_From_Limited_With
(CW_Typ
, From_Limited_With
(Ent
));
3191 Set_Has_Unknown_Discriminants
(CW_Typ
);
3192 Set_Is_First_Subtype
(CW_Typ
);
3193 Set_Is_Tagged_Type
(CW_Typ
);
3194 Set_Materialize_Entity
(CW_Typ
, Materialize
);
3195 Set_Scope
(CW_Typ
, Scop
);
3196 Reinit_Size_Align
(CW_Typ
);
3200 ------------------------
3201 -- Expand_With_Clause --
3202 ------------------------
3204 procedure Expand_With_Clause
(Item
: Node_Id
; Nam
: Node_Id
; N
: Node_Id
) is
3205 Loc
: constant Source_Ptr
:= Sloc
(Nam
);
3207 function Build_Unit_Name
(Nam
: Node_Id
) return Node_Id
;
3208 -- Build name to be used in implicit with_clause. In most cases this
3209 -- is the source name, but if renamings are present we must make the
3210 -- original unit visible, not the one it renames. The entity in the
3211 -- with clause is the renamed unit, but the identifier is the one from
3212 -- the source, which allows us to recover the unit renaming.
3214 ---------------------
3215 -- Build_Unit_Name --
3216 ---------------------
3218 function Build_Unit_Name
(Nam
: Node_Id
) return Node_Id
is
3223 if Nkind
(Nam
) = N_Identifier
then
3224 return New_Occurrence_Of
(Entity
(Nam
), Loc
);
3227 Ent
:= Entity
(Nam
);
3229 if Present
(Entity
(Selector_Name
(Nam
)))
3230 and then Chars
(Entity
(Selector_Name
(Nam
))) /= Chars
(Ent
)
3232 Nkind
(Unit_Declaration_Node
(Entity
(Selector_Name
(Nam
)))) =
3233 N_Package_Renaming_Declaration
3235 -- The name in the with_clause is of the form A.B.C, and B is
3236 -- given by a renaming declaration. In that case we may not
3237 -- have analyzed the unit for B, but replaced it directly in
3238 -- lib-load with the unit it renames. We have to make A.B
3239 -- visible, so analyze the declaration for B now, in case it
3240 -- has not been done yet.
3242 Ent
:= Entity
(Selector_Name
(Nam
));
3245 (Unit_Declaration_Node
(Entity
(Selector_Name
(Nam
)))));
3249 Make_Expanded_Name
(Loc
,
3250 Chars
=> Chars
(Entity
(Nam
)),
3251 Prefix
=> Build_Unit_Name
(Prefix
(Nam
)),
3252 Selector_Name
=> New_Occurrence_Of
(Ent
, Loc
));
3253 Set_Entity
(Result
, Ent
);
3257 end Build_Unit_Name
;
3261 Ent
: constant Entity_Id
:= Entity
(Nam
);
3264 -- Start of processing for Expand_With_Clause
3268 Make_With_Clause
(Loc
,
3269 Name
=> Build_Unit_Name
(Nam
));
3271 Set_Corresponding_Spec
(Withn
, Ent
);
3272 Set_First_Name
(Withn
);
3273 Set_Implicit_With
(Withn
);
3274 Set_Library_Unit
(Withn
, Parent
(Unit_Declaration_Node
(Ent
)));
3275 Set_Parent_With
(Withn
);
3277 -- If the unit is a [generic] package or subprogram declaration
3278 -- (including a subprogram body acting as spec), a private_with_clause
3279 -- on a child unit implies that the implicit with on the parent is also
3282 if Nkind
(Unit
(N
)) in N_Generic_Package_Declaration
3283 | N_Package_Declaration
3284 | N_Generic_Subprogram_Declaration
3285 | N_Subprogram_Declaration
3288 Set_Private_Present
(Withn
, Private_Present
(Item
));
3291 Prepend
(Withn
, Context_Items
(N
));
3292 Mark_Rewrite_Insertion
(Withn
);
3294 Install_With_Clause
(Withn
);
3296 -- If we have "with X.Y;", we want to recurse on "X", except in the
3297 -- unusual case where X.Y is a renaming of X. In that case, the scope
3298 -- of X will be null.
3300 if Nkind
(Nam
) = N_Expanded_Name
3301 and then Present
(Scope
(Entity
(Prefix
(Nam
))))
3303 Expand_With_Clause
(Item
, Prefix
(Nam
), N
);
3305 end Expand_With_Clause
;
3307 --------------------------------
3308 -- Generate_Parent_References --
3309 --------------------------------
3311 procedure Generate_Parent_References
(N
: Node_Id
; P_Id
: Entity_Id
) is
3313 P_Name
: Entity_Id
:= P_Id
;
3316 if Nkind
(N
) = N_Subunit
then
3319 Pref
:= Name
(Parent
(Defining_Entity
(N
)));
3322 if Nkind
(Pref
) = N_Expanded_Name
then
3324 -- Done already, if the unit has been compiled indirectly as
3325 -- part of the closure of its context because of inlining.
3330 while Nkind
(Pref
) = N_Selected_Component
loop
3331 Change_Selected_Component_To_Expanded_Name
(Pref
);
3332 Set_Entity
(Pref
, P_Name
);
3333 Set_Etype
(Pref
, Etype
(P_Name
));
3334 Generate_Reference
(P_Name
, Pref
, 'r');
3335 Pref
:= Prefix
(Pref
);
3336 P_Name
:= Scope
(P_Name
);
3339 -- The guard here on P_Name is to handle the error condition where
3340 -- the parent unit is missing because the file was not found.
3342 if Present
(P_Name
) then
3343 Set_Entity
(Pref
, P_Name
);
3344 Set_Etype
(Pref
, Etype
(P_Name
));
3345 Generate_Reference
(P_Name
, Pref
, 'r');
3346 Style
.Check_Identifier
(Pref
, P_Name
);
3348 end Generate_Parent_References
;
3350 ---------------------
3351 -- Has_With_Clause --
3352 ---------------------
3354 function Has_With_Clause
3357 Is_Limited
: Boolean := False) return Boolean
3361 function Named_Unit
(Clause
: Node_Id
) return Entity_Id
;
3362 -- Return the entity for the unit named in a [limited] with clause
3368 function Named_Unit
(Clause
: Node_Id
) return Entity_Id
is
3370 if Nkind
(Name
(Clause
)) = N_Selected_Component
then
3371 return Entity
(Selector_Name
(Name
(Clause
)));
3373 return Entity
(Name
(Clause
));
3377 -- Start of processing for Has_With_Clause
3380 Item
:= First
(Context_Items
(C_Unit
));
3381 while Present
(Item
) loop
3382 if Nkind
(Item
) = N_With_Clause
3383 and then Limited_Present
(Item
) = Is_Limited
3384 and then Named_Unit
(Item
) = Pack
3393 end Has_With_Clause
;
3395 -----------------------------
3396 -- Implicit_With_On_Parent --
3397 -----------------------------
3399 procedure Implicit_With_On_Parent
3400 (Child_Unit
: Node_Id
;
3403 Loc
: constant Source_Ptr
:= Sloc
(N
);
3404 P
: constant Node_Id
:= Parent_Spec
(Child_Unit
);
3405 P_Unit
: Node_Id
:= Unit
(P
);
3406 P_Name
: constant Entity_Id
:= Get_Parent_Entity
(P_Unit
);
3409 function Build_Ancestor_Name
(P
: Node_Id
) return Node_Id
;
3410 -- Build prefix of child unit name. Recurse if needed
3412 function Build_Unit_Name
return Node_Id
;
3413 -- If the unit is a child unit, build qualified name with all ancestors
3415 -------------------------
3416 -- Build_Ancestor_Name --
3417 -------------------------
3419 function Build_Ancestor_Name
(P
: Node_Id
) return Node_Id
is
3420 P_Ref
: constant Node_Id
:=
3421 New_Occurrence_Of
(Defining_Entity
(P
), Loc
);
3422 P_Spec
: Node_Id
:= P
;
3425 -- Ancestor may have been rewritten as a package body. Retrieve the
3426 -- original spec to trace earlier ancestors.
3428 if Nkind
(P
) = N_Package_Body
3429 and then Nkind
(Original_Node
(P
)) = N_Package_Instantiation
3431 P_Spec
:= Original_Node
(P
);
3434 if No
(Parent_Spec
(P_Spec
)) then
3438 Make_Selected_Component
(Loc
,
3440 Build_Ancestor_Name
(Unit
(Parent_Spec
(P_Spec
))),
3441 Selector_Name
=> P_Ref
);
3443 end Build_Ancestor_Name
;
3445 ---------------------
3446 -- Build_Unit_Name --
3447 ---------------------
3449 function Build_Unit_Name
return Node_Id
is
3453 if No
(Parent_Spec
(P_Unit
)) then
3454 return New_Occurrence_Of
(P_Name
, Loc
);
3458 Make_Expanded_Name
(Loc
,
3459 Chars
=> Chars
(P_Name
),
3461 Build_Ancestor_Name
(Unit
(Parent_Spec
(P_Unit
))),
3462 Selector_Name
=> New_Occurrence_Of
(P_Name
, Loc
));
3463 Set_Entity
(Result
, P_Name
);
3467 end Build_Unit_Name
;
3469 -- Start of processing for Implicit_With_On_Parent
3472 -- The unit of the current compilation may be a package body that
3473 -- replaces an instance node. In this case we need the original instance
3474 -- node to construct the proper parent name.
3476 if Nkind
(P_Unit
) = N_Package_Body
3477 and then Nkind
(Original_Node
(P_Unit
)) = N_Package_Instantiation
3479 P_Unit
:= Original_Node
(P_Unit
);
3482 -- We add the implicit with if the child unit is the current unit being
3483 -- compiled. If the current unit is a body, we do not want to add an
3484 -- implicit_with a second time to the corresponding spec.
3486 if Nkind
(Child_Unit
) = N_Package_Declaration
3487 and then Child_Unit
/= Unit
(Cunit
(Current_Sem_Unit
))
3492 Withn
:= Make_With_Clause
(Loc
, Name
=> Build_Unit_Name
);
3494 Set_Corresponding_Spec
(Withn
, P_Name
);
3495 Set_First_Name
(Withn
);
3496 Set_Implicit_With
(Withn
);
3497 Set_Library_Unit
(Withn
, P
);
3498 Set_Parent_With
(Withn
);
3500 -- Node is placed at the beginning of the context items, so that
3501 -- subsequent use clauses on the parent can be validated.
3503 Prepend
(Withn
, Context_Items
(N
));
3504 Mark_Rewrite_Insertion
(Withn
);
3506 Install_With_Clause
(Withn
);
3508 if Is_Child_Spec
(P_Unit
) then
3509 Implicit_With_On_Parent
(P_Unit
, N
);
3511 end Implicit_With_On_Parent
;
3517 function In_Chain
(E
: Entity_Id
) return Boolean is
3521 H
:= Current_Entity
(E
);
3522 while Present
(H
) loop
3533 ---------------------
3534 -- Install_Context --
3535 ---------------------
3537 procedure Install_Context
(N
: Node_Id
; Chain
: Boolean := True) is
3538 Lib_Unit
: constant Node_Id
:= Unit
(N
);
3541 Install_Context_Clauses
(N
, Chain
);
3543 if Is_Child_Spec
(Lib_Unit
) then
3545 (Lib_Unit
=> Lib_Unit
,
3546 Is_Private
=> Private_Present
(Parent
(Lib_Unit
)),
3550 Install_Limited_Context_Clauses
(N
);
3551 end Install_Context
;
3553 -----------------------------
3554 -- Install_Context_Clauses --
3555 -----------------------------
3557 procedure Install_Context_Clauses
(N
: Node_Id
; Chain
: Boolean := True) is
3558 Lib_Unit
: constant Node_Id
:= Unit
(N
);
3560 Uname_Node
: Entity_Id
;
3561 Check_Private
: Boolean := False;
3562 Decl_Node
: Node_Id
;
3563 Lib_Parent
: Entity_Id
;
3566 -- First skip configuration pragmas at the start of the context. They
3567 -- are not technically part of the context clause, but that's where the
3568 -- parser puts them. Note they were analyzed in Analyze_Context.
3570 Item
:= First
(Context_Items
(N
));
3571 while Present
(Item
)
3572 and then Nkind
(Item
) = N_Pragma
3573 and then Pragma_Name
(Item
) in Configuration_Pragma_Names
3578 -- Loop through the actual context clause items. We process everything
3579 -- except Limited_With clauses in this routine. Limited_With clauses
3580 -- are separately installed (see Install_Limited_Context_Clauses).
3582 while Present
(Item
) loop
3584 -- Case of explicit WITH clause
3586 if Nkind
(Item
) = N_With_Clause
3587 and then not Implicit_With
(Item
)
3589 if Limited_Present
(Item
) then
3591 -- Limited withed units will be installed later
3595 -- If Name (Item) is not an entity name, something is wrong, and
3596 -- this will be detected in due course, for now ignore the item
3598 elsif not Is_Entity_Name
(Name
(Item
)) then
3601 elsif No
(Entity
(Name
(Item
))) then
3602 Set_Entity
(Name
(Item
), Any_Id
);
3606 Uname_Node
:= Entity
(Name
(Item
));
3608 if Is_Private_Descendant
(Uname_Node
) then
3609 Check_Private
:= True;
3612 Install_With_Clause
(Item
);
3614 Decl_Node
:= Unit_Declaration_Node
(Uname_Node
);
3616 -- If the unit is a subprogram instance, it appears nested within
3617 -- a package that carries the parent information.
3619 if Is_Generic_Instance
(Uname_Node
)
3620 and then Ekind
(Uname_Node
) /= E_Package
3622 Decl_Node
:= Parent
(Parent
(Decl_Node
));
3625 if Is_Child_Spec
(Decl_Node
) then
3626 if Nkind
(Name
(Item
)) = N_Expanded_Name
then
3627 Expand_With_Clause
(Item
, Prefix
(Name
(Item
)), N
);
3629 -- If not an expanded name, the child unit must be a
3630 -- renaming, nothing to do.
3635 elsif Nkind
(Decl_Node
) = N_Subprogram_Body
3636 and then not Acts_As_Spec
(Parent
(Decl_Node
))
3637 and then Is_Child_Spec
(Unit
(Library_Unit
(Parent
(Decl_Node
))))
3639 Implicit_With_On_Parent
3640 (Unit
(Library_Unit
(Parent
(Decl_Node
))), N
);
3643 -- Check license conditions unless this is a dummy unit
3645 if Sloc
(Library_Unit
(Item
)) /= No_Location
then
3646 License_Check
: declare
3647 Withu
: constant Unit_Number_Type
:=
3648 Get_Source_Unit
(Library_Unit
(Item
));
3649 Withl
: constant License_Type
:=
3650 License
(Source_Index
(Withu
));
3651 Unitl
: constant License_Type
:=
3652 License
(Source_Index
(Current_Sem_Unit
));
3654 procedure License_Error
;
3655 -- Signal error of bad license
3661 procedure License_Error
is
3664 ("license of withed unit & may be inconsistent??",
3668 -- Start of processing for License_Check
3671 -- Exclude license check if withed unit is an internal unit.
3672 -- This situation arises e.g. with the GPL version of GNAT.
3674 if Is_Internal_Unit
(Withu
) then
3677 -- Otherwise check various cases
3689 if Withl
= Restricted
then
3693 when Modified_GPL
=>
3694 if Withl
= Restricted
or else Withl
= GPL
then
3698 when Unrestricted
=>
3705 -- Case of USE PACKAGE clause
3707 elsif Nkind
(Item
) = N_Use_Package_Clause
then
3708 Analyze_Use_Package
(Item
, Chain
);
3710 -- Case of USE TYPE clause
3712 elsif Nkind
(Item
) = N_Use_Type_Clause
then
3713 Analyze_Use_Type
(Item
, Chain
);
3717 elsif Nkind
(Item
) = N_Pragma
then
3725 if Is_Child_Spec
(Lib_Unit
) then
3727 -- The unit also has implicit with_clauses on its own parents
3729 if No
(Context_Items
(N
)) then
3730 Set_Context_Items
(N
, New_List
);
3733 Implicit_With_On_Parent
(Lib_Unit
, N
);
3736 -- If the unit is a body, the context of the specification must also
3737 -- be installed. That includes private with_clauses in that context.
3739 if Nkind
(Lib_Unit
) = N_Package_Body
3740 or else (Nkind
(Lib_Unit
) = N_Subprogram_Body
3741 and then not Acts_As_Spec
(N
))
3743 Install_Context
(Library_Unit
(N
), Chain
);
3745 -- Only install private with-clauses of a spec that comes from
3746 -- source, excluding specs created for a subprogram body that is
3749 if Comes_From_Source
(Library_Unit
(N
)) then
3750 Install_Private_With_Clauses
3751 (Defining_Entity
(Unit
(Library_Unit
(N
))));
3754 if Is_Child_Spec
(Unit
(Library_Unit
(N
))) then
3756 -- If the unit is the body of a public child unit, the private
3757 -- declarations of the parent must be made visible. If the child
3758 -- unit is private, the private declarations have been installed
3759 -- already in the call to Install_Parents for the spec. Installing
3760 -- private declarations must be done for all ancestors of public
3761 -- child units. In addition, sibling units mentioned in the
3762 -- context clause of the body are directly visible.
3770 Lib_Spec
:= Unit
(Library_Unit
(N
));
3771 while Is_Child_Spec
(Lib_Spec
) loop
3772 P
:= Unit
(Parent_Spec
(Lib_Spec
));
3773 P_Name
:= Defining_Entity
(P
);
3775 if not (Private_Present
(Parent
(Lib_Spec
)))
3776 and then not In_Private_Part
(P_Name
)
3778 Install_Private_Declarations
(P_Name
);
3779 Install_Private_With_Clauses
(P_Name
);
3780 Set_Use
(Private_Declarations
(Specification
(P
)));
3788 -- For a package body, children in context are immediately visible
3790 Install_Siblings
(Defining_Entity
(Unit
(Library_Unit
(N
))), N
);
3793 if Nkind
(Lib_Unit
) in N_Generic_Package_Declaration
3794 | N_Generic_Subprogram_Declaration
3795 | N_Package_Declaration
3796 | N_Subprogram_Declaration
3798 if Is_Child_Spec
(Lib_Unit
) then
3799 Lib_Parent
:= Defining_Entity
(Unit
(Parent_Spec
(Lib_Unit
)));
3800 Set_Is_Private_Descendant
3801 (Defining_Entity
(Lib_Unit
),
3802 Is_Private_Descendant
(Lib_Parent
)
3803 or else Private_Present
(Parent
(Lib_Unit
)));
3806 Set_Is_Private_Descendant
3807 (Defining_Entity
(Lib_Unit
),
3808 Private_Present
(Parent
(Lib_Unit
)));
3812 if Check_Private
then
3813 Check_Private_Child_Unit
(N
);
3815 end Install_Context_Clauses
;
3817 -------------------------------------
3818 -- Install_Limited_Context_Clauses --
3819 -------------------------------------
3821 procedure Install_Limited_Context_Clauses
(N
: Node_Id
) is
3824 procedure Check_Renamings
(P
: Node_Id
; W
: Node_Id
);
3825 -- Check that the unlimited view of a given compilation_unit is not
3826 -- already visible through "use + renamings".
3828 procedure Check_Private_Limited_Withed_Unit
(Item
: Node_Id
);
3829 -- Check that if a limited_with clause of a given compilation_unit
3830 -- mentions a descendant of a private child of some library unit, then
3831 -- the given compilation_unit must be the declaration of a private
3832 -- descendant of that library unit, or a public descendant of such. The
3833 -- code is analogous to that of Check_Private_Child_Unit but we cannot
3834 -- use entities on the limited with_clauses because their units have not
3835 -- been analyzed, so we have to climb the tree of ancestors looking for
3836 -- private keywords.
3838 procedure Expand_Limited_With_Clause
3839 (Comp_Unit
: Node_Id
;
3842 -- If a child unit appears in a limited_with clause, there are implicit
3843 -- limited_with clauses on all parents that are not already visible
3844 -- through a regular with clause. This procedure creates the implicit
3845 -- limited with_clauses for the parents and loads the corresponding
3846 -- units. The shadow entities are created when the inserted clause is
3847 -- analyzed. Implements Ada 2005 (AI-50217).
3849 ---------------------
3850 -- Check_Renamings --
3851 ---------------------
3853 procedure Check_Renamings
(P
: Node_Id
; W
: Node_Id
) is
3861 pragma Assert
(Nkind
(W
) = N_With_Clause
);
3863 -- Protect the frontend against previous critical errors
3865 case Nkind
(Unit
(Library_Unit
(W
))) is
3866 when N_Generic_Package_Declaration
3867 | N_Generic_Subprogram_Declaration
3868 | N_Package_Declaration
3869 | N_Subprogram_Declaration
3877 -- Check "use + renamings"
3879 WEnt
:= Defining_Unit_Name
(Specification
(Unit
(Library_Unit
(W
))));
3880 Spec
:= Specification
(Unit
(P
));
3882 Item
:= First
(Visible_Declarations
(Spec
));
3883 while Present
(Item
) loop
3885 -- Look only at use package clauses
3887 if Nkind
(Item
) = N_Use_Package_Clause
then
3889 E
:= Entity
(Name
(Item
));
3891 pragma Assert
(Present
(Parent
(E
)));
3893 if Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
3894 and then Renamed_Entity
(E
) = WEnt
3896 -- The unlimited view is visible through use clause and
3897 -- renamings. There is no need to generate the error
3898 -- message here because Is_Visible_Through_Renamings
3899 -- takes care of generating the precise error message.
3903 elsif Nkind
(Parent
(E
)) = N_Package_Specification
then
3905 -- The use clause may refer to a local package.
3906 -- Check all the enclosing scopes.
3909 while E2
/= Standard_Standard
and then E2
/= WEnt
loop
3915 ("unlimited view visible through use clause", W
);
3924 -- Recursive call to check all the ancestors
3926 if Is_Child_Spec
(Unit
(P
)) then
3927 Check_Renamings
(P
=> Parent_Spec
(Unit
(P
)), W
=> W
);
3929 end Check_Renamings
;
3931 ---------------------------------------
3932 -- Check_Private_Limited_Withed_Unit --
3933 ---------------------------------------
3935 procedure Check_Private_Limited_Withed_Unit
(Item
: Node_Id
) is
3936 Curr_Parent
: Node_Id
;
3937 Child_Parent
: Node_Id
;
3938 Curr_Private
: Boolean;
3941 -- Compilation unit of the parent of the withed library unit
3943 Child_Parent
:= Library_Unit
(Item
);
3945 -- If the child unit is a public child, then locate its nearest
3946 -- private ancestor, if any, then Child_Parent will then be set to
3947 -- the parent of that ancestor.
3949 if not Private_Present
(Library_Unit
(Item
)) then
3950 while Present
(Child_Parent
)
3951 and then not Private_Present
(Child_Parent
)
3953 Child_Parent
:= Parent_Spec
(Unit
(Child_Parent
));
3956 if No
(Child_Parent
) then
3961 Child_Parent
:= Parent_Spec
(Unit
(Child_Parent
));
3963 -- Traverse all the ancestors of the current compilation unit to
3964 -- check if it is a descendant of named library unit.
3966 Curr_Parent
:= Parent
(Item
);
3967 Curr_Private
:= Private_Present
(Curr_Parent
);
3969 while Present
(Parent_Spec
(Unit
(Curr_Parent
)))
3970 and then Curr_Parent
/= Child_Parent
3972 Curr_Parent
:= Parent_Spec
(Unit
(Curr_Parent
));
3973 Curr_Private
:= Curr_Private
or else Private_Present
(Curr_Parent
);
3976 if Curr_Parent
/= Child_Parent
then
3978 ("unit in with clause is private child unit!", Item
);
3980 ("\current unit must also have parent&!",
3981 Item
, Defining_Unit_Name
(Specification
(Unit
(Child_Parent
))));
3983 elsif Private_Present
(Parent
(Item
))
3984 or else Curr_Private
3985 or else Private_Present
(Item
)
3986 or else Nkind
(Unit
(Parent
(Item
))) in
3987 N_Package_Body | N_Subprogram_Body | N_Subunit
3989 -- Current unit is private, of descendant of a private unit
3995 ("current unit must also be private descendant of&",
3996 Item
, Defining_Unit_Name
(Specification
(Unit
(Child_Parent
))));
3998 end Check_Private_Limited_Withed_Unit
;
4000 --------------------------------
4001 -- Expand_Limited_With_Clause --
4002 --------------------------------
4004 procedure Expand_Limited_With_Clause
4005 (Comp_Unit
: Node_Id
;
4009 Loc
: constant Source_Ptr
:= Sloc
(Nam
);
4010 Unum
: Unit_Number_Type
;
4013 function Previous_Withed_Unit
(W
: Node_Id
) return Boolean;
4014 -- Returns true if the context already includes a with_clause for
4015 -- this unit. If the with_clause is nonlimited, the unit is fully
4016 -- visible and an implicit limited_with should not be created. If
4017 -- there is already a limited_with clause for W, a second one is
4018 -- simply redundant.
4020 --------------------------
4021 -- Previous_Withed_Unit --
4022 --------------------------
4024 function Previous_Withed_Unit
(W
: Node_Id
) return Boolean is
4028 -- A limited with_clause cannot appear in the same context_clause
4029 -- as a nonlimited with_clause which mentions the same library.
4031 Item
:= First
(Context_Items
(Comp_Unit
));
4032 while Present
(Item
) loop
4033 if Nkind
(Item
) = N_With_Clause
4034 and then Library_Unit
(Item
) = Library_Unit
(W
)
4043 end Previous_Withed_Unit
;
4045 -- Start of processing for Expand_Limited_With_Clause
4048 if Nkind
(Nam
) = N_Identifier
then
4050 -- Create node for name of withed unit
4053 Make_With_Clause
(Loc
,
4054 Name
=> New_Copy
(Nam
));
4056 else pragma Assert
(Nkind
(Nam
) = N_Selected_Component
);
4058 Make_With_Clause
(Loc
,
4059 Name
=> Make_Selected_Component
(Loc
,
4060 Prefix
=> New_Copy_Tree
(Prefix
(Nam
)),
4061 Selector_Name
=> New_Copy
(Selector_Name
(Nam
))));
4062 Set_Parent
(Withn
, Parent
(N
));
4065 Set_First_Name
(Withn
);
4066 Set_Implicit_With
(Withn
);
4067 Set_Limited_Present
(Withn
);
4071 (Load_Name
=> Get_Spec_Name
(Get_Unit_Name
(Nam
)),
4076 -- Do not generate a limited_with_clause on the current unit. This
4077 -- path is taken when a unit has a limited_with clause on one of its
4080 if Unum
= Current_Sem_Unit
then
4084 Set_Library_Unit
(Withn
, Cunit
(Unum
));
4085 Set_Corresponding_Spec
4086 (Withn
, Specification
(Unit
(Cunit
(Unum
))));
4088 if not Previous_Withed_Unit
(Withn
) then
4089 Prepend
(Withn
, Context_Items
(Parent
(N
)));
4090 Mark_Rewrite_Insertion
(Withn
);
4092 -- Add implicit limited_with_clauses for parents of child units
4093 -- mentioned in limited_with clauses.
4095 if Nkind
(Nam
) = N_Selected_Component
then
4096 Expand_Limited_With_Clause
(Comp_Unit
, Prefix
(Nam
), N
);
4101 if not Limited_View_Installed
(Withn
) then
4102 Install_Limited_With_Clause
(Withn
);
4105 end Expand_Limited_With_Clause
;
4107 -- Start of processing for Install_Limited_Context_Clauses
4110 Item
:= First
(Context_Items
(N
));
4111 while Present
(Item
) loop
4112 if Nkind
(Item
) = N_With_Clause
4113 and then Limited_Present
(Item
)
4114 and then not Error_Posted
(Item
)
4116 if Nkind
(Name
(Item
)) = N_Selected_Component
then
4117 Expand_Limited_With_Clause
4118 (Comp_Unit
=> N
, Nam
=> Prefix
(Name
(Item
)), N
=> Item
);
4121 Check_Private_Limited_Withed_Unit
(Item
);
4123 if not Implicit_With
(Item
) and then Is_Child_Spec
(Unit
(N
)) then
4124 Check_Renamings
(Parent_Spec
(Unit
(N
)), Item
);
4127 -- A unit may have a limited with on itself if it has a limited
4128 -- with_clause on one of its child units. In that case it is
4129 -- already being compiled and it makes no sense to install its
4132 -- If the item is a limited_private_with_clause, install it if the
4133 -- current unit is a body or if it is a private child. Otherwise
4134 -- the private clause is installed before analyzing the private
4135 -- part of the current unit.
4137 if Library_Unit
(Item
) /= Cunit
(Current_Sem_Unit
)
4138 and then not Limited_View_Installed
(Item
)
4140 not Is_Ancestor_Unit
4141 (Library_Unit
(Item
), Cunit
(Current_Sem_Unit
))
4143 if not Private_Present
(Item
)
4144 or else Private_Present
(N
)
4145 or else Nkind
(Unit
(N
)) in
4146 N_Package_Body | N_Subprogram_Body | N_Subunit
4148 Install_Limited_With_Clause
(Item
);
4156 -- Ada 2005 (AI-412): Examine visible declarations of a package spec,
4157 -- looking for incomplete subtype declarations of incomplete types
4158 -- visible through a limited with clause.
4160 if Ada_Version
>= Ada_2005
4161 and then Analyzed
(N
)
4162 and then Nkind
(Unit
(N
)) = N_Package_Declaration
4167 Non_Lim_View
: Entity_Id
;
4170 Decl
:= First
(Visible_Declarations
(Specification
(Unit
(N
))));
4171 while Present
(Decl
) loop
4172 if Nkind
(Decl
) = N_Subtype_Declaration
4174 Ekind
(Defining_Identifier
(Decl
)) = E_Incomplete_Subtype
4176 From_Limited_With
(Defining_Identifier
(Decl
))
4178 Def_Id
:= Defining_Identifier
(Decl
);
4179 Non_Lim_View
:= Non_Limited_View
(Def_Id
);
4181 if not Is_Incomplete_Type
(Non_Lim_View
) then
4183 -- Convert an incomplete subtype declaration into a
4184 -- corresponding nonlimited view subtype declaration.
4185 -- This is usually the case when analyzing a body that
4186 -- has regular with clauses, when the spec has limited
4189 -- If the nonlimited view is still incomplete, it is
4190 -- the dummy entry already created, and the declaration
4191 -- cannot be reanalyzed. This is the case when installing
4192 -- a parent unit that has limited with-clauses.
4194 Set_Subtype_Indication
(Decl
,
4195 New_Occurrence_Of
(Non_Lim_View
, Sloc
(Def_Id
)));
4196 Set_Etype
(Def_Id
, Non_Lim_View
);
4198 (Def_Id
, Subtype_Kind
(Ekind
(Non_Lim_View
)));
4199 Set_Analyzed
(Decl
, False);
4201 -- Reanalyze the declaration, suppressing the call to
4202 -- Enter_Name to avoid duplicate names.
4204 Analyze_Subtype_Declaration
4214 end Install_Limited_Context_Clauses
;
4216 ---------------------
4217 -- Install_Parents --
4218 ---------------------
4220 procedure Install_Parents
4221 (Lib_Unit
: Node_Id
;
4222 Is_Private
: Boolean;
4223 Chain
: Boolean := True)
4231 P
:= Unit
(Parent_Spec
(Lib_Unit
));
4232 P_Name
:= Get_Parent_Entity
(P
);
4234 if Etype
(P_Name
) = Any_Type
then
4238 if Ekind
(P_Name
) = E_Generic_Package
4239 and then Nkind
(Lib_Unit
) not in N_Generic_Declaration
4240 | N_Generic_Renaming_Declaration
4243 ("child of a generic package must be a generic unit", Lib_Unit
);
4245 elsif not Is_Package_Or_Generic_Package
(P_Name
) then
4247 ("parent unit must be package or generic package", Lib_Unit
);
4248 raise Unrecoverable_Error
;
4250 elsif Present
(Renamed_Entity
(P_Name
)) then
4251 Error_Msg_N
("parent unit cannot be a renaming", Lib_Unit
);
4252 raise Unrecoverable_Error
;
4254 -- Verify that a child of an instance is itself an instance, or the
4255 -- renaming of one. Given that an instance that is a unit is replaced
4256 -- with a package declaration, check against the original node. The
4257 -- parent may be currently being instantiated, in which case it appears
4258 -- as a declaration, but the generic_parent is already established
4259 -- indicating that we deal with an instance.
4261 elsif Nkind
(Original_Node
(P
)) = N_Package_Instantiation
then
4262 if Nkind
(Lib_Unit
) in N_Renaming_Declaration
4263 or else Nkind
(Original_Node
(Lib_Unit
)) in N_Generic_Instantiation
4265 (Nkind
(Lib_Unit
) = N_Package_Declaration
4266 and then Present
(Generic_Parent
(Specification
(Lib_Unit
))))
4271 ("child of an instance must be an instance or renaming",
4276 -- This is the recursive call that ensures all parents are loaded
4278 if Is_Child_Spec
(P
) then
4282 Is_Private
or else Private_Present
(Parent
(Lib_Unit
)),
4286 -- Now we can install the context for this parent
4288 Install_Context_Clauses
(Parent_Spec
(Lib_Unit
), Chain
);
4289 Install_Limited_Context_Clauses
(Parent_Spec
(Lib_Unit
));
4290 Install_Siblings
(P_Name
, Parent
(Lib_Unit
));
4292 -- The child unit is in the declarative region of the parent. The parent
4293 -- must therefore appear in the scope stack and be visible, as when
4294 -- compiling the corresponding body. If the child unit is private or it
4295 -- is a package body, private declarations must be accessible as well.
4296 -- Use declarations in the parent must also be installed. Finally, other
4297 -- child units of the same parent that are in the context are
4298 -- immediately visible.
4300 -- Find entity for compilation unit, and set its private descendant
4301 -- status as needed. Indicate that it is a compilation unit, which is
4302 -- redundant in general, but needed if this is a generated child spec
4303 -- for a child body without previous spec.
4305 E_Name
:= Defining_Entity
(Lib_Unit
);
4307 Set_Is_Child_Unit
(E_Name
);
4308 Set_Is_Compilation_Unit
(E_Name
);
4310 Set_Is_Private_Descendant
(E_Name
,
4311 Is_Private_Descendant
(P_Name
)
4312 or else Private_Present
(Parent
(Lib_Unit
)));
4314 P_Spec
:= Package_Specification
(P_Name
);
4315 Push_Scope
(P_Name
);
4317 -- Save current visibility of unit
4319 Scope_Stack
.Table
(Scope_Stack
.Last
).Previous_Visibility
:=
4320 Is_Immediately_Visible
(P_Name
);
4321 Set_Is_Immediately_Visible
(P_Name
);
4322 Install_Visible_Declarations
(P_Name
);
4323 Set_Use
(Visible_Declarations
(P_Spec
));
4325 -- If the parent is a generic unit, its formal part may contain formal
4326 -- packages and use clauses for them.
4328 if Ekind
(P_Name
) = E_Generic_Package
then
4329 Set_Use
(Generic_Formal_Declarations
(Parent
(P_Spec
)));
4332 if Is_Private
or else Private_Present
(Parent
(Lib_Unit
)) then
4333 Install_Private_Declarations
(P_Name
);
4334 Install_Private_With_Clauses
(P_Name
);
4335 Set_Use
(Private_Declarations
(P_Spec
));
4337 end Install_Parents
;
4339 ----------------------------------
4340 -- Install_Private_With_Clauses --
4341 ----------------------------------
4343 procedure Install_Private_With_Clauses
(P
: Entity_Id
) is
4344 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
4348 if Debug_Flag_I
then
4349 Write_Str
("install private with clauses of ");
4350 Write_Name
(Chars
(P
));
4354 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
4355 Item
:= First
(Context_Items
(Parent
(Decl
)));
4356 while Present
(Item
) loop
4357 if Nkind
(Item
) = N_With_Clause
4358 and then Private_Present
(Item
)
4360 -- If the unit is an ancestor of the current one, it is the
4361 -- case of a private limited with clause on a child unit, and
4362 -- the compilation of one of its descendants, In that case the
4363 -- limited view is errelevant.
4365 if Limited_Present
(Item
) then
4366 if not Limited_View_Installed
(Item
)
4368 not Is_Ancestor_Unit
(Library_Unit
(Item
),
4369 Cunit
(Current_Sem_Unit
))
4371 Install_Limited_With_Clause
(Item
);
4374 Install_With_Clause
(Item
, Private_With_OK
=> True);
4381 end Install_Private_With_Clauses
;
4383 ----------------------
4384 -- Install_Siblings --
4385 ----------------------
4387 procedure Install_Siblings
(U_Name
: Entity_Id
; N
: Node_Id
) is
4393 -- Iterate over explicit with clauses, and check whether the scope of
4394 -- each entity is an ancestor of the current unit, in which case it is
4395 -- immediately visible.
4397 Item
:= First
(Context_Items
(N
));
4398 while Present
(Item
) loop
4400 -- Do not install private_with_clauses declaration, unless unit
4401 -- is itself a private child unit, or is a body. Note that for a
4402 -- subprogram body the private_with_clause does not take effect
4403 -- until after the specification.
4405 if Nkind
(Item
) /= N_With_Clause
4406 or else Implicit_With
(Item
)
4407 or else Limited_Present
(Item
)
4408 or else Error_Posted
(Item
)
4410 -- Skip processing malformed trees
4412 or else (Try_Semantics
4413 and then Nkind
(Name
(Item
)) not in N_Has_Entity
)
4417 elsif not Private_Present
(Item
)
4418 or else Private_Present
(N
)
4419 or else Nkind
(Unit
(N
)) = N_Package_Body
4421 Id
:= Entity
(Name
(Item
));
4423 if Is_Child_Unit
(Id
)
4424 and then Is_Ancestor_Package
(Scope
(Id
), U_Name
)
4426 Set_Is_Immediately_Visible
(Id
);
4428 -- Check for the presence of another unit in the context that
4429 -- may be inadvertently hidden by the child.
4431 Prev
:= Current_Entity
(Id
);
4434 and then Is_Immediately_Visible
(Prev
)
4435 and then not Is_Child_Unit
(Prev
)
4441 Clause
:= First
(Context_Items
(N
));
4442 while Present
(Clause
) loop
4443 if Nkind
(Clause
) = N_With_Clause
4444 and then Entity
(Name
(Clause
)) = Prev
4447 ("child unit& hides compilation unit " &
4448 "with the same name??",
4458 -- The With_Clause may be on a grandchild or one of its further
4459 -- descendants, which makes a child immediately visible. Examine
4460 -- ancestry to determine whether such a child exists. For example,
4461 -- if current unit is A.C, and with_clause is on A.X.Y.Z, then X
4462 -- is immediately visible.
4464 elsif Is_Child_Unit
(Id
) then
4470 while Is_Child_Unit
(Par
) loop
4471 if Is_Ancestor_Package
(Scope
(Par
), U_Name
) then
4472 Set_Is_Immediately_Visible
(Par
);
4481 -- If the item is a private with-clause on a child unit, the parent
4482 -- may have been installed already, but the child unit must remain
4483 -- invisible until installed in a private part or body, unless there
4484 -- is already a regular with_clause for it in the current unit.
4486 elsif Private_Present
(Item
) then
4487 Id
:= Entity
(Name
(Item
));
4489 if Is_Child_Unit
(Id
) then
4493 function In_Context
return Boolean;
4494 -- Scan context of current unit, to check whether there is
4495 -- a with_clause on the same unit as a private with-clause
4496 -- on a parent, in which case child unit is visible. If the
4497 -- unit is a grandchild, the same applies to its parent.
4503 function In_Context
return Boolean is
4506 First
(Context_Items
(Cunit
(Current_Sem_Unit
)));
4507 while Present
(Clause
) loop
4508 if Nkind
(Clause
) = N_With_Clause
4509 and then Comes_From_Source
(Clause
)
4510 and then Is_Entity_Name
(Name
(Clause
))
4511 and then not Private_Present
(Clause
)
4513 if Entity
(Name
(Clause
)) = Id
4515 (Nkind
(Name
(Clause
)) = N_Expanded_Name
4516 and then Entity
(Prefix
(Name
(Clause
))) = Id
)
4529 Set_Is_Visible_Lib_Unit
(Id
, In_Context
);
4536 end Install_Siblings
;
4538 ---------------------------------
4539 -- Install_Limited_With_Clause --
4540 ---------------------------------
4542 procedure Install_Limited_With_Clause
(N
: Node_Id
) is
4543 P_Unit
: constant Entity_Id
:= Unit
(Library_Unit
(N
));
4546 Is_Child_Package
: Boolean := False;
4547 Lim_Header
: Entity_Id
;
4548 Lim_Typ
: Entity_Id
;
4550 procedure Check_Body_Required
;
4551 -- A unit mentioned in a limited with_clause may not be mentioned in
4552 -- a regular with_clause, but must still be included in the current
4553 -- partition. We need to determine whether the unit needs a body, so
4554 -- that the binder can determine the name of the file to be compiled.
4555 -- Checking whether a unit needs a body can be done without semantic
4556 -- analysis, by examining the nature of the declarations in the package.
4558 function Has_Limited_With_Clause
4559 (C_Unit
: Entity_Id
;
4560 Pack
: Entity_Id
) return Boolean;
4561 -- Determine whether any package in the ancestor chain starting with
4562 -- C_Unit has a limited with clause for package Pack.
4564 -------------------------
4565 -- Check_Body_Required --
4566 -------------------------
4568 procedure Check_Body_Required
is
4569 PA
: constant List_Id
:=
4570 Pragmas_After
(Aux_Decls_Node
(Parent
(P_Unit
)));
4572 procedure Check_Declarations
(Spec
: Node_Id
);
4573 -- Recursive procedure that does the work and checks nested packages
4575 ------------------------
4576 -- Check_Declarations --
4577 ------------------------
4579 procedure Check_Declarations
(Spec
: Node_Id
) is
4581 Incomplete_Decls
: constant Elist_Id
:= New_Elmt_List
;
4583 Subp_List
: constant Elist_Id
:= New_Elmt_List
;
4585 procedure Check_Pragma_Import
(P
: Node_Id
);
4586 -- If a pragma import applies to a previous subprogram, the
4587 -- enclosing unit may not need a body. The processing is syntactic
4588 -- and does not require a declaration to be analyzed. The code
4589 -- below also handles pragma Import when applied to a subprogram
4590 -- that renames another. In this case the pragma applies to the
4593 -- Chains of multiple renames are not handled by the code below.
4594 -- It is probably impossible to handle all cases without proper
4595 -- name resolution. In such cases the algorithm is conservative
4596 -- and will indicate that a body is needed???
4598 -------------------------
4599 -- Check_Pragma_Import --
4600 -------------------------
4602 procedure Check_Pragma_Import
(P
: Node_Id
) is
4608 procedure Remove_Homonyms
(E
: Node_Id
);
4609 -- Make one pass over list of subprograms. Called again if
4610 -- subprogram is a renaming. E is known to be an identifier.
4612 ---------------------
4613 -- Remove_Homonyms --
4614 ---------------------
4616 procedure Remove_Homonyms
(E
: Node_Id
) is
4617 R
: Entity_Id
:= Empty
;
4618 -- Name of renamed entity, if any
4621 Subp_Id
:= First_Elmt
(Subp_List
);
4622 while Present
(Subp_Id
) loop
4623 if Chars
(Node
(Subp_Id
)) = Chars
(E
) then
4624 if Nkind
(Parent
(Parent
(Node
(Subp_Id
))))
4625 /= N_Subprogram_Renaming_Declaration
4628 Next_Elmt
(Subp_Id
);
4629 Remove_Elmt
(Subp_List
, Prev_Id
);
4631 R
:= Name
(Parent
(Parent
(Node
(Subp_Id
))));
4635 Next_Elmt
(Subp_Id
);
4640 if Nkind
(R
) = N_Identifier
then
4641 Remove_Homonyms
(R
);
4643 elsif Nkind
(R
) = N_Selected_Component
then
4644 Remove_Homonyms
(Selector_Name
(R
));
4646 -- Renaming of attribute
4652 end Remove_Homonyms
;
4654 -- Start of processing for Check_Pragma_Import
4657 -- Find name of entity in Import pragma. We have not analyzed
4658 -- the construct, so we must guard against syntax errors.
4660 Arg
:= Next
(First
(Pragma_Argument_Associations
(P
)));
4663 or else Nkind
(Expression
(Arg
)) /= N_Identifier
4667 Imported
:= Expression
(Arg
);
4670 Remove_Homonyms
(Imported
);
4671 end Check_Pragma_Import
;
4673 -- Start of processing for Check_Declarations
4676 -- Search for Elaborate Body pragma
4678 Decl
:= First
(Visible_Declarations
(Spec
));
4679 while Present
(Decl
)
4680 and then Nkind
(Decl
) = N_Pragma
4682 if Get_Pragma_Id
(Decl
) = Pragma_Elaborate_Body
then
4683 Set_Body_Required
(Library_Unit
(N
));
4690 -- Look for declarations that require the presence of a body. We
4691 -- have already skipped pragmas at the start of the list.
4693 while Present
(Decl
) loop
4695 -- Subprogram that comes from source means body may be needed.
4696 -- Save for subsequent examination of import pragmas.
4698 if Comes_From_Source
(Decl
)
4699 and then (Nkind
(Decl
) in N_Subprogram_Declaration
4700 | N_Subprogram_Renaming_Declaration
4701 | N_Generic_Subprogram_Declaration
)
4703 Append_Elmt
(Defining_Entity
(Decl
), Subp_List
);
4705 -- Package declaration of generic package declaration. We need
4706 -- to recursively examine nested declarations.
4708 elsif Nkind
(Decl
) in N_Package_Declaration
4709 | N_Generic_Package_Declaration
4711 Check_Declarations
(Specification
(Decl
));
4713 elsif Nkind
(Decl
) = N_Pragma
4714 and then Pragma_Name
(Decl
) = Name_Import
4716 Check_Pragma_Import
(Decl
);
4722 -- Same set of tests for private part. In addition to subprograms
4723 -- detect the presence of Taft Amendment types (incomplete types
4724 -- completed in the body).
4726 Decl
:= First
(Private_Declarations
(Spec
));
4727 while Present
(Decl
) loop
4728 if Comes_From_Source
(Decl
)
4729 and then Nkind
(Decl
) in N_Subprogram_Declaration
4730 | N_Subprogram_Renaming_Declaration
4731 | N_Generic_Subprogram_Declaration
4733 Append_Elmt
(Defining_Entity
(Decl
), Subp_List
);
4735 elsif Nkind
(Decl
) in N_Package_Declaration
4736 | N_Generic_Package_Declaration
4738 Check_Declarations
(Specification
(Decl
));
4740 -- Collect incomplete type declarations for separate pass
4742 elsif Nkind
(Decl
) = N_Incomplete_Type_Declaration
then
4743 Append_Elmt
(Decl
, Incomplete_Decls
);
4745 elsif Nkind
(Decl
) = N_Pragma
4746 and then Pragma_Name
(Decl
) = Name_Import
4748 Check_Pragma_Import
(Decl
);
4754 -- Now check incomplete declarations to locate Taft amendment
4755 -- types. This can be done by examining the defining identifiers
4756 -- of type declarations without real semantic analysis.
4762 Inc
:= First_Elmt
(Incomplete_Decls
);
4763 while Present
(Inc
) loop
4764 Decl
:= Next
(Node
(Inc
));
4765 while Present
(Decl
) loop
4766 if Nkind
(Decl
) = N_Full_Type_Declaration
4767 and then Chars
(Defining_Identifier
(Decl
)) =
4768 Chars
(Defining_Identifier
(Node
(Inc
)))
4776 -- If no completion, this is a TAT, and a body is needed
4779 Set_Body_Required
(Library_Unit
(N
));
4787 -- Finally, check whether there are subprograms that still require
4788 -- a body, i.e. are not renamings or null.
4790 if not Is_Empty_Elmt_List
(Subp_List
) then
4796 Subp_Id
:= First_Elmt
(Subp_List
);
4797 Spec
:= Parent
(Node
(Subp_Id
));
4799 while Present
(Subp_Id
) loop
4800 if Nkind
(Parent
(Spec
))
4801 = N_Subprogram_Renaming_Declaration
4805 elsif Nkind
(Spec
) = N_Procedure_Specification
4806 and then Null_Present
(Spec
)
4811 Set_Body_Required
(Library_Unit
(N
));
4815 Next_Elmt
(Subp_Id
);
4819 end Check_Declarations
;
4821 -- Start of processing for Check_Body_Required
4824 -- If this is an imported package (Java and CIL usage) no body is
4825 -- needed. Scan list of pragmas that may follow a compilation unit
4826 -- to look for a relevant pragma Import.
4828 if Present
(PA
) then
4834 while Present
(Prag
) loop
4835 if Nkind
(Prag
) = N_Pragma
4836 and then Get_Pragma_Id
(Prag
) = Pragma_Import
4846 Check_Declarations
(Specification
(P_Unit
));
4847 end Check_Body_Required
;
4849 -----------------------------
4850 -- Has_Limited_With_Clause --
4851 -----------------------------
4853 function Has_Limited_With_Clause
4854 (C_Unit
: Entity_Id
;
4855 Pack
: Entity_Id
) return Boolean
4862 while Present
(Par
) loop
4863 if Ekind
(Par
) /= E_Package
then
4867 -- Retrieve the Compilation_Unit node for Par and determine if
4868 -- its context clauses contain a limited with for Pack.
4870 Par_Unit
:= Parent
(Parent
(Parent
(Par
)));
4872 if Nkind
(Par_Unit
) = N_Package_Declaration
then
4873 Par_Unit
:= Parent
(Par_Unit
);
4876 if Has_With_Clause
(Par_Unit
, Pack
, True) then
4880 -- If there are more ancestors, climb up the tree, otherwise we
4883 if Is_Child_Unit
(Par
) then
4891 end Has_Limited_With_Clause
;
4893 -- Start of processing for Install_Limited_With_Clause
4896 pragma Assert
(not Limited_View_Installed
(N
));
4898 -- In case of limited with_clause on subprograms, generics, instances,
4899 -- or renamings, the corresponding error was previously posted and we
4900 -- have nothing to do here. If the file is missing altogether, it has
4901 -- no source location.
4903 if Nkind
(P_Unit
) /= N_Package_Declaration
4904 or else Sloc
(P_Unit
) = No_Location
4909 P
:= Defining_Unit_Name
(Specification
(P_Unit
));
4911 -- Handle child packages
4913 if Nkind
(P
) = N_Defining_Program_Unit_Name
then
4914 Is_Child_Package
:= True;
4915 P
:= Defining_Identifier
(P
);
4918 -- Do not install the limited-view if the context of the unit is already
4919 -- available through a regular with clause.
4921 if Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
4922 and then Has_With_Clause
(Cunit
(Current_Sem_Unit
), P
)
4927 -- Do not install the limited-view if the full-view is already visible
4928 -- through renaming declarations.
4930 if Is_Visible_Through_Renamings
(P
, N
) then
4934 -- Do not install the limited view if this is the unit being analyzed.
4935 -- This unusual case will happen when a unit has a limited_with clause
4936 -- on one of its children. The compilation of the child forces the load
4937 -- of the parent which tries to install the limited view of the child
4938 -- again. Installing the limited view must also be disabled when
4939 -- compiling the body of the child unit.
4941 if P
= Cunit_Entity
(Current_Sem_Unit
)
4942 or else (Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
4943 and then P
= Main_Unit_Entity
4944 and then Is_Ancestor_Unit
4945 (Cunit
(Main_Unit
), Cunit
(Current_Sem_Unit
)))
4950 -- This scenario is similar to the one above, the difference is that the
4951 -- compilation of sibling Par.Sib forces the load of parent Par which
4952 -- tries to install the limited view of Lim_Pack [1]. However Par.Sib
4953 -- has a with clause for Lim_Pack [2] in its body, and thus needs the
4954 -- nonlimited views of all entities from Lim_Pack.
4956 -- limited with Lim_Pack; -- [1]
4957 -- package Par is ... package Lim_Pack is ...
4959 -- with Lim_Pack; -- [2]
4960 -- package Par.Sib is ... package body Par.Sib is ...
4962 -- In this case Main_Unit_Entity is the spec of Par.Sib and Current_
4963 -- Sem_Unit is the body of Par.Sib.
4965 if Ekind
(P
) = E_Package
4966 and then Ekind
(Main_Unit_Entity
) = E_Package
4967 and then Is_Child_Unit
(Main_Unit_Entity
)
4969 -- The body has a regular with clause
4971 and then Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
4972 and then Has_With_Clause
(Cunit
(Current_Sem_Unit
), P
)
4974 -- One of the ancestors has a limited with clause
4976 and then Nkind
(Parent
(Parent
(Main_Unit_Entity
))) =
4977 N_Package_Specification
4978 and then Has_Limited_With_Clause
(Scope
(Main_Unit_Entity
), P
)
4983 -- A common use of the limited-with is to have a limited-with in the
4984 -- package spec, and a normal with in its package body. For example:
4986 -- limited with X; -- [1]
4990 -- package body A is ...
4992 -- The compilation of A's body installs the context clauses found at [2]
4993 -- and then the context clauses of its specification (found at [1]). As
4994 -- a consequence, at [1] the specification of X has been analyzed and it
4995 -- is immediately visible. According to the semantics of limited-with
4996 -- context clauses we don't install the limited view because the full
4997 -- view of X supersedes its limited view.
4999 if Analyzed
(P_Unit
)
5001 (Is_Immediately_Visible
(P
)
5002 or else (Is_Child_Package
and then Is_Visible_Lib_Unit
(P
)))
5005 -- The presence of both the limited and the analyzed nonlimited view
5006 -- may also be an error, such as an illegal context for a limited
5007 -- with_clause. In that case, do not process the context item at all.
5009 if Error_Posted
(N
) then
5013 if Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
then
5017 Item
:= First
(Context_Items
(Cunit
(Current_Sem_Unit
)));
5018 while Present
(Item
) loop
5019 if Nkind
(Item
) = N_With_Clause
5020 and then Comes_From_Source
(Item
)
5021 and then Entity
(Name
(Item
)) = P
5030 -- If this is a child body, assume that the nonlimited with_clause
5031 -- appears in an ancestor. Could be refined ???
5035 (Unit
(Library_Unit
(Cunit
(Current_Sem_Unit
)))))
5042 -- If in package declaration, nonlimited view brought in from
5043 -- parent unit or some error condition.
5049 if Debug_Flag_I
then
5050 Write_Str
("install limited view of ");
5051 Write_Name
(Chars
(P
));
5055 -- If the unit has not been analyzed and the limited view has not been
5056 -- already installed then we install it.
5058 if not Analyzed
(P_Unit
) then
5059 if not In_Chain
(P
) then
5061 -- Minimum decoration
5063 Mutate_Ekind
(P
, E_Package
);
5064 Set_Etype
(P
, Standard_Void_Type
);
5065 Set_Scope
(P
, Standard_Standard
);
5066 Set_Is_Visible_Lib_Unit
(P
);
5068 if Is_Child_Package
then
5069 Set_Is_Child_Unit
(P
);
5070 Set_Scope
(P
, Defining_Entity
(Unit
(Parent_Spec
(P_Unit
))));
5073 -- Place entity on visibility structure
5075 Set_Homonym
(P
, Current_Entity
(P
));
5076 Set_Current_Entity
(P
);
5078 if Debug_Flag_I
then
5079 Write_Str
(" (homonym) chain ");
5080 Write_Name
(Chars
(P
));
5084 -- Install the incomplete view. The first element of the limited
5085 -- view is a header (an E_Package entity) used to reference the
5086 -- first shadow entity in the private part of the package.
5088 Lim_Header
:= Limited_View
(P
);
5089 Lim_Typ
:= First_Entity
(Lim_Header
);
5091 while Present
(Lim_Typ
)
5092 and then Lim_Typ
/= First_Private_Entity
(Lim_Header
)
5094 Set_Homonym
(Lim_Typ
, Current_Entity
(Lim_Typ
));
5095 Set_Current_Entity
(Lim_Typ
);
5097 if Debug_Flag_I
then
5098 Write_Str
(" (homonym) chain ");
5099 Write_Name
(Chars
(Lim_Typ
));
5103 Next_Entity
(Lim_Typ
);
5107 -- If the unit appears in a previous regular with_clause, the regular
5108 -- entities of the public part of the withed package must be replaced
5109 -- by the shadow ones.
5111 -- This code must be kept synchronized with the code that replaces the
5112 -- shadow entities by the real entities in Remove_Limited_With_Unit,
5113 -- otherwise the contents of the homonym chains are not consistent.
5116 -- Hide all the type entities of the public part of the package to
5117 -- avoid its usage. This is needed to cover all the subtype decla-
5118 -- rations because we do not remove them from the homonym chain.
5120 E
:= First_Entity
(P
);
5121 while Present
(E
) and then E
/= First_Private_Entity
(P
) loop
5123 Set_Was_Hidden
(E
, Is_Hidden
(E
));
5130 -- Replace the real entities by the shadow entities of the limited
5131 -- view. The first element of the limited view is a header that is
5132 -- used to reference the first shadow entity in the private part
5133 -- of the package. Successive elements are the limited views of the
5134 -- type (including regular incomplete types) declared in the package.
5136 Lim_Header
:= Limited_View
(P
);
5138 Lim_Typ
:= First_Entity
(Lim_Header
);
5139 while Present
(Lim_Typ
)
5140 and then Lim_Typ
/= First_Private_Entity
(Lim_Header
)
5142 pragma Assert
(not In_Chain
(Lim_Typ
));
5144 -- Do not unchain nested packages and child units
5146 if Ekind
(Lim_Typ
) /= E_Package
5147 and then not Is_Child_Unit
(Lim_Typ
)
5150 Non_Lim_View
: constant Entity_Id
:=
5151 Non_Limited_View
(Lim_Typ
);
5156 Prev
:= Current_Entity
(Lim_Typ
);
5158 -- Replace Non_Lim_View in the homonyms list, so that the
5159 -- limited view becomes available.
5161 -- If the nonlimited view is a record with an anonymous
5162 -- self-referential component, the analysis of the record
5163 -- declaration creates an incomplete type with the same name
5164 -- in order to define an internal access type. The visible
5165 -- entity is now the incomplete type, and that is the one to
5166 -- replace in the visibility structure.
5168 -- Similarly, if the source already contains the incomplete
5169 -- type declaration, the limited view of the incomplete type
5170 -- is in fact never visible (AI05-129) but we have created a
5171 -- shadow entity E1 for it that points to E2, the incomplete
5172 -- type at stake. This in turn has full view E3 that is the
5173 -- full declaration, with a corresponding shadow entity E4.
5174 -- When reinstalling the limited view, the visible entity E2
5175 -- is first replaced with E1, but E4 must eventually become
5176 -- the visible entity as per the AI and thus displace E1, as
5177 -- it is replacing E3 in the homonyms list.
5179 -- regular views limited views
5181 -- * E2 (incomplete) <-- E1 (shadow)
5186 -- E3 (full) <-- E4 (shadow) *
5188 -- [*] denotes the visible entity (Current_Entity)
5190 if Prev
= Non_Lim_View
5192 (Ekind
(Prev
) = E_Incomplete_Type
5193 and then Full_View
(Prev
) = Non_Lim_View
)
5195 (Ekind
(Prev
) = E_Incomplete_Type
5196 and then From_Limited_With
(Prev
)
5198 Ekind
(Non_Limited_View
(Prev
)) = E_Incomplete_Type
5200 Full_View
(Non_Limited_View
(Prev
)) = Non_Lim_View
)
5202 Set_Current_Entity
(Lim_Typ
);
5205 while Present
(Homonym
(Prev
))
5206 and then Homonym
(Prev
) /= Non_Lim_View
5208 Prev
:= Homonym
(Prev
);
5211 Set_Homonym
(Prev
, Lim_Typ
);
5214 Set_Homonym
(Lim_Typ
, Homonym
(Non_Lim_View
));
5217 if Debug_Flag_I
then
5218 Write_Str
(" (homonym) chain ");
5219 Write_Name
(Chars
(Lim_Typ
));
5224 Next_Entity
(Lim_Typ
);
5228 -- The package must be visible while the limited-with clause is active
5229 -- because references to the type P.T must resolve in the usual way.
5230 -- In addition, we remember that the limited-view has been installed to
5231 -- uninstall it at the point of context removal.
5233 Set_Is_Immediately_Visible
(P
);
5234 Set_Limited_View_Installed
(N
);
5236 -- If unit has not been analyzed in some previous context, check
5237 -- (imperfectly ???) whether it might need a body.
5239 if not Analyzed
(P_Unit
) then
5240 Check_Body_Required
;
5243 -- If the package in the limited_with clause is a child unit, the clause
5244 -- is unanalyzed and appears as a selected component. Recast it as an
5245 -- expanded name so that the entity can be properly set. Use entity of
5246 -- parent, if available, for higher ancestors in the name.
5248 if Nkind
(Name
(N
)) = N_Selected_Component
then
5256 while Nkind
(Nam
) = N_Selected_Component
5257 and then Present
(Ent
)
5259 Change_Selected_Component_To_Expanded_Name
(Nam
);
5261 -- Set entity of parent identifiers if the unit is a child
5262 -- unit. This ensures that the tree is properly formed from
5263 -- semantic point of view. The unit entities are not fully
5264 -- analyzed, so we need to follow unit links in the tree.
5266 Set_Entity
(Nam
, Ent
);
5268 Nam
:= Prefix
(Nam
);
5271 (Unit
(Parent_Spec
(Unit_Declaration_Node
(Ent
))));
5273 -- Set entity of last ancestor
5275 if Nkind
(Nam
) = N_Identifier
then
5276 Set_Entity
(Nam
, Ent
);
5282 Set_Entity
(Name
(N
), P
);
5283 Set_From_Limited_With
(P
);
5284 end Install_Limited_With_Clause
;
5286 -------------------------
5287 -- Install_With_Clause --
5288 -------------------------
5290 procedure Install_With_Clause
5291 (With_Clause
: Node_Id
;
5292 Private_With_OK
: Boolean := False)
5294 Uname
: constant Entity_Id
:= Entity
(Name
(With_Clause
));
5295 P
: constant Entity_Id
:= Scope
(Uname
);
5298 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
5299 -- compiling a package declaration and the Private_With_OK flag was not
5300 -- set by the caller. These declarations will be installed later (before
5301 -- analyzing the private part of the package).
5303 if Private_Present
(With_Clause
)
5304 and then Nkind
(Unit
(Parent
(With_Clause
)))
5305 in N_Package_Declaration | N_Generic_Package_Declaration
5306 and then not Private_With_OK
5311 if Debug_Flag_I
then
5312 if Private_Present
(With_Clause
) then
5313 Write_Str
("install private withed unit ");
5315 Write_Str
("install withed unit ");
5318 Write_Name
(Chars
(Uname
));
5322 -- We do not apply the restrictions to an internal unit unless we are
5323 -- compiling the internal unit as a main unit. This check is also
5324 -- skipped for dummy units (for missing packages).
5326 if Sloc
(Uname
) /= No_Location
5327 and then (not Is_Internal_Unit
(Current_Sem_Unit
)
5328 or else Current_Sem_Unit
= Main_Unit
)
5330 Check_Restricted_Unit
5331 (Unit_Name
(Get_Source_Unit
(Uname
)), With_Clause
);
5334 if P
/= Standard_Standard
then
5336 -- If the unit is not analyzed after analysis of the with clause and
5337 -- it is an instantiation then it awaits a body and is the main unit.
5338 -- Its appearance in the context of some other unit indicates a
5339 -- circular dependency (DEC suite perversity).
5341 if not Analyzed
(Uname
)
5342 and then Nkind
(Parent
(Uname
)) = N_Package_Instantiation
5345 ("instantiation depends on itself", Name
(With_Clause
));
5347 elsif not Analyzed
(Uname
)
5348 and then Is_Internal_Unit
(Current_Sem_Unit
)
5349 and then not Is_Visible_Lib_Unit
(Uname
)
5350 and then No
(Scope
(Uname
))
5352 if Is_Predefined_Unit
(Current_Sem_Unit
) then
5354 ("predefined unit depends on itself", Name
(With_Clause
));
5357 ("GNAT-defined unit depends on itself", Name
(With_Clause
));
5361 elsif not Is_Visible_Lib_Unit
(Uname
) then
5363 -- Abandon processing in case of previous errors
5365 if No
(Scope
(Uname
)) then
5366 Check_Error_Detected
;
5370 Set_Is_Visible_Lib_Unit
(Uname
);
5372 -- If the unit is a wrapper package for a compilation unit that is
5373 -- a subprogram instance, indicate that the instance itself is a
5374 -- visible unit. This is necessary if the instance is inlined.
5376 if Is_Wrapper_Package
(Uname
) then
5377 Set_Is_Visible_Lib_Unit
(Related_Instance
(Uname
));
5380 -- If the child unit appears in the context of its parent, it is
5381 -- immediately visible.
5383 if In_Open_Scopes
(Scope
(Uname
)) then
5384 Set_Is_Immediately_Visible
(Uname
);
5387 if Is_Generic_Instance
(Uname
)
5388 and then Is_Subprogram
(Uname
)
5390 -- Set flag as well on the visible entity that denotes the
5391 -- instance, which renames the current one.
5393 Set_Is_Visible_Lib_Unit
5395 (Defining_Entity
(Unit
(Library_Unit
(With_Clause
)))));
5398 -- The parent unit may have been installed already, and may have
5399 -- appeared in a use clause.
5401 if In_Use
(Scope
(Uname
)) then
5402 Set_Is_Potentially_Use_Visible
(Uname
);
5405 Set_Context_Installed
(With_Clause
);
5408 elsif not Is_Immediately_Visible
(Uname
) then
5409 Set_Is_Visible_Lib_Unit
(Uname
);
5411 if not Private_Present
(With_Clause
) or else Private_With_OK
then
5412 Set_Is_Immediately_Visible
(Uname
);
5415 Set_Context_Installed
(With_Clause
);
5418 -- A [private] with clause overrides a limited with clause. Restore the
5419 -- proper view of the package by performing the following actions:
5421 -- * Remove all shadow entities which hide their corresponding
5422 -- entities from direct visibility by updating the entity and
5425 -- * Enter the corresponding entities back in direct visibility
5427 -- Note that the original limited with clause which installed its view
5428 -- is still marked as "active". This effect is undone when the clause
5429 -- itself is removed, see Remove_Limited_With_Clause.
5431 if Ekind
(Uname
) = E_Package
and then From_Limited_With
(Uname
) then
5432 Remove_Limited_With_Unit
(Unit_Declaration_Node
(Uname
));
5435 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
5436 -- unit if there is a visible homograph for it declared in the same
5437 -- declarative region. This pathological case can only arise when an
5438 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
5439 -- G1 has a generic child also named G2, and the context includes with_
5440 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
5441 -- of I1.G2 visible as well. If the child unit is named Standard, do
5442 -- not apply the check to the Standard package itself.
5444 if Is_Child_Unit
(Uname
)
5445 and then Is_Visible_Lib_Unit
(Uname
)
5446 and then Ada_Version
>= Ada_2005
5449 Decl1
: constant Node_Id
:= Unit_Declaration_Node
(P
);
5455 U2
:= Homonym
(Uname
);
5456 while Present
(U2
) and then U2
/= Standard_Standard
loop
5458 Decl2
:= Unit_Declaration_Node
(P2
);
5460 if Is_Child_Unit
(U2
) and then Is_Visible_Lib_Unit
(U2
) then
5461 if Is_Generic_Instance
(P
)
5462 and then Nkind
(Decl1
) = N_Package_Declaration
5463 and then Generic_Parent
(Specification
(Decl1
)) = P2
5465 Error_Msg_N
("illegal with_clause", With_Clause
);
5467 ("\child unit has visible homograph" &
5468 " (RM 8.3(26), 10.1.1(19))",
5472 elsif Is_Generic_Instance
(P2
)
5473 and then Nkind
(Decl2
) = N_Package_Declaration
5474 and then Generic_Parent
(Specification
(Decl2
)) = P
5476 -- With_clause for child unit of instance appears before
5477 -- in the context. We want to place the error message on
5478 -- it, not on the generic child unit itself.
5481 Prev_Clause
: Node_Id
;
5484 Prev_Clause
:= First
(List_Containing
(With_Clause
));
5485 while Entity
(Name
(Prev_Clause
)) /= U2
loop
5489 pragma Assert
(Present
(Prev_Clause
));
5490 Error_Msg_N
("illegal with_clause", Prev_Clause
);
5492 ("\child unit has visible homograph" &
5493 " (RM 8.3(26), 10.1.1(19))",
5504 end Install_With_Clause
;
5510 function Is_Child_Spec
(Lib_Unit
: Node_Id
) return Boolean is
5511 K
: constant Node_Kind
:= Nkind
(Lib_Unit
);
5514 return (K
in N_Generic_Declaration
or else
5515 K
in N_Generic_Instantiation
or else
5516 K
in N_Generic_Renaming_Declaration
or else
5517 K
= N_Package_Declaration
or else
5518 K
= N_Package_Renaming_Declaration
or else
5519 K
= N_Subprogram_Declaration
or else
5520 K
= N_Subprogram_Renaming_Declaration
)
5521 and then Present
(Parent_Spec
(Lib_Unit
));
5524 ------------------------------------
5525 -- Is_Legal_Shadow_Entity_In_Body --
5526 ------------------------------------
5528 function Is_Legal_Shadow_Entity_In_Body
(T
: Entity_Id
) return Boolean is
5529 C_Unit
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
5531 return Nkind
(Unit
(C_Unit
)) = N_Package_Body
5534 (C_Unit
, Cunit_Entity
(Get_Source_Unit
(Non_Limited_View
(T
))));
5535 end Is_Legal_Shadow_Entity_In_Body
;
5537 ----------------------
5538 -- Is_Ancestor_Unit --
5539 ----------------------
5541 function Is_Ancestor_Unit
(U1
: Node_Id
; U2
: Node_Id
) return Boolean is
5542 E1
: constant Entity_Id
:= Defining_Entity
(Unit
(U1
));
5545 if Nkind
(Unit
(U2
)) in N_Package_Body | N_Subprogram_Body
then
5546 E2
:= Defining_Entity
(Unit
(Library_Unit
(U2
)));
5547 return Is_Ancestor_Package
(E1
, E2
);
5551 end Is_Ancestor_Unit
;
5553 ----------------------------------
5554 -- Is_Visible_Through_Renamings --
5555 ----------------------------------
5557 function Is_Visible_Through_Renamings
5559 Error_Node
: Node_Id
:= Empty
) return Boolean
5561 function Is_Limited_Withed_Unit
5562 (Lib_Unit
: Node_Id
;
5563 Pkg_Ent
: Entity_Id
) return Boolean;
5564 -- Return True if Pkg_Ent is a limited-withed package of the given
5567 ----------------------------
5568 -- Is_Limited_Withed_Unit --
5569 ----------------------------
5571 function Is_Limited_Withed_Unit
5572 (Lib_Unit
: Node_Id
;
5573 Pkg_Ent
: Entity_Id
) return Boolean
5575 Item
: Node_Id
:= First
(Context_Items
(Lib_Unit
));
5578 while Present
(Item
) loop
5579 if Nkind
(Item
) = N_With_Clause
5580 and then Limited_Present
(Item
)
5581 and then Entity
(Name
(Item
)) = Pkg_Ent
5590 end Is_Limited_Withed_Unit
;
5594 Kind
: constant Node_Kind
:= Nkind
(Unit
(Cunit
(Current_Sem_Unit
)));
5600 -- Example of the error detected by this subprogram:
5608 -- package Ren_P renames P;
5614 -- limited with P; -- ERROR
5615 -- package R.C is ...
5617 Aux_Unit
:= Cunit
(Current_Sem_Unit
);
5620 Item
:= First
(Context_Items
(Aux_Unit
));
5621 while Present
(Item
) loop
5622 if Nkind
(Item
) = N_With_Clause
5623 and then not Limited_Present
(Item
)
5624 and then Nkind
(Unit
(Library_Unit
(Item
))) =
5625 N_Package_Declaration
5628 First
(Visible_Declarations
5629 (Specification
(Unit
(Library_Unit
(Item
)))));
5630 while Present
(Decl
) loop
5631 if Nkind
(Decl
) = N_Package_Renaming_Declaration
5632 and then Entity
(Name
(Decl
)) = P
5633 and then not Is_Limited_Withed_Unit
5634 (Lib_Unit
=> Library_Unit
(Item
),
5635 Pkg_Ent
=> Entity
(Name
(Decl
)))
5637 -- Generate the error message only if the current unit
5638 -- is a package declaration; in case of subprogram
5639 -- bodies and package bodies we just return True to
5640 -- indicate that the limited view must not be
5643 if Kind
= N_Package_Declaration
5644 and then Present
(Error_Node
)
5647 ("simultaneous visibility of the limited and " &
5648 "unlimited views not allowed", Error_Node
);
5649 Error_Msg_Sloc
:= Sloc
(Item
);
5651 ("\\ unlimited view of & visible through the " &
5652 "context clause #", Error_Node
, P
);
5653 Error_Msg_Sloc
:= Sloc
(Decl
);
5654 Error_Msg_NE
("\\ and the renaming #", Error_Node
, P
);
5667 -- If it is a body not acting as spec, follow pointer to the
5668 -- corresponding spec, otherwise follow pointer to parent spec.
5670 if Present
(Library_Unit
(Aux_Unit
))
5671 and then Nkind
(Unit
(Aux_Unit
)) in
5672 N_Package_Body | N_Subprogram_Body
5674 if Aux_Unit
= Library_Unit
(Aux_Unit
) then
5676 -- Aux_Unit is a body that acts as a spec. Clause has
5677 -- already been flagged as illegal.
5682 Aux_Unit
:= Library_Unit
(Aux_Unit
);
5686 Aux_Unit
:= Parent_Spec
(Unit
(Aux_Unit
));
5689 exit when No
(Aux_Unit
);
5693 end Is_Visible_Through_Renamings
;
5695 -----------------------
5696 -- Load_Needed_Body --
5697 -----------------------
5699 -- N is a generic unit named in a with clause, or else it is a unit that
5700 -- contains a generic unit or an inlined function. In order to perform an
5701 -- instantiation, the body of the unit must be present. If the unit itself
5702 -- is generic, we assume that an instantiation follows, and load & analyze
5703 -- the body unconditionally. This forces analysis of the spec as well.
5705 -- If the unit is not generic, but contains a generic unit, it is loaded on
5706 -- demand, at the point of instantiation (see ch12).
5708 procedure Load_Needed_Body
5712 Body_Name
: Unit_Name_Type
;
5713 Unum
: Unit_Number_Type
;
5715 Save_Style_Check
: constant Boolean := Opt
.Style_Check
;
5716 -- The loading and analysis is done with style checks off
5719 if not GNAT_Mode
then
5720 Style_Check
:= False;
5723 Body_Name
:= Get_Body_Name
(Get_Unit_Name
(Unit
(N
)));
5726 (Load_Name
=> Body_Name
,
5732 if Unum
= No_Unit
then
5736 Compiler_State
:= Analyzing
; -- reset after load
5738 if Fatal_Error
(Unum
) /= Error_Detected
or else Try_Semantics
then
5739 if Debug_Flag_L
then
5740 Write_Str
("*** Loaded generic body");
5744 -- We always perform analyses
5745 Semantics
(Cunit
(Unum
));
5751 Style_Check
:= Save_Style_Check
;
5752 end Load_Needed_Body
;
5754 -------------------------
5755 -- Build_Limited_Views --
5756 -------------------------
5758 procedure Build_Limited_Views
(N
: Node_Id
) is
5759 Unum
: constant Unit_Number_Type
:=
5760 Get_Source_Unit
(Library_Unit
(N
));
5761 Is_Analyzed
: constant Boolean := Analyzed
(Cunit
(Unum
));
5763 Shadow_Pack
: Entity_Id
;
5764 -- The corresponding shadow entity of the withed package. This entity
5765 -- offers incomplete views of packages and types as well as abstract
5766 -- views of states and variables declared within.
5768 Last_Shadow
: Entity_Id
:= Empty
;
5769 -- The last shadow entity created by routine Build_Shadow_Entity
5771 procedure Build_Shadow_Entity
5774 Shadow
: out Entity_Id
;
5775 Is_Tagged
: Boolean := False);
5776 -- Create a shadow entity that hides Ent and offers an abstract or
5777 -- incomplete view of Ent. Scop is the proper scope. Flag Is_Tagged
5778 -- should be set when Ent is a tagged type. The generated entity is
5779 -- added to Shadow_Pack. The routine updates the value of Last_Shadow.
5781 procedure Decorate_Package
(Ent
: Entity_Id
; Scop
: Entity_Id
);
5782 -- Perform minimal decoration of a package or its corresponding shadow
5783 -- entity denoted by Ent. Scop is the proper scope.
5785 procedure Decorate_State
(Ent
: Entity_Id
; Scop
: Entity_Id
);
5786 -- Perform full decoration of an abstract state or its corresponding
5787 -- shadow entity denoted by Ent. Scop is the proper scope.
5789 procedure Decorate_Variable
(Ent
: Entity_Id
; Scop
: Entity_Id
);
5790 -- Perform minimal decoration of a variable denoted by Ent. Scop is the
5793 procedure Process_Declarations_And_States
5797 Create_Abstract_Views
: Boolean);
5798 -- Inspect the states of package Pack and declarative list Decls. Create
5799 -- shadow entities for all nested packages, states, types and variables
5800 -- encountered. Scop is the proper scope. Create_Abstract_Views should
5801 -- be set when the abstract states and variables need to be processed.
5803 -------------------------
5804 -- Build_Shadow_Entity --
5805 -------------------------
5807 procedure Build_Shadow_Entity
5810 Shadow
: out Entity_Id
;
5811 Is_Tagged
: Boolean := False)
5814 Shadow
:= Make_Temporary
(Sloc
(Ent
), 'Z');
5816 -- The shadow entity must share the same name and parent as the
5819 Set_Chars
(Shadow
, Chars
(Ent
));
5820 Set_Parent
(Shadow
, Parent
(Ent
));
5822 -- The abstract view of a variable is a state, not another variable
5824 if Ekind
(Ent
) = E_Variable
then
5825 Mutate_Ekind
(Shadow
, E_Abstract_State
);
5827 Mutate_Ekind
(Shadow
, Ekind
(Ent
));
5830 Set_Is_Internal
(Shadow
);
5831 Set_From_Limited_With
(Shadow
);
5833 -- Add the new shadow entity to the limited view of the package
5835 Last_Shadow
:= Shadow
;
5836 Append_Entity
(Shadow
, Shadow_Pack
);
5838 -- Perform context-specific decoration of the shadow entity
5840 if Ekind
(Ent
) = E_Abstract_State
then
5841 Decorate_State
(Shadow
, Scop
);
5842 Set_Non_Limited_View
(Shadow
, Ent
);
5844 elsif Ekind
(Ent
) = E_Package
then
5845 Decorate_Package
(Shadow
, Scop
);
5847 elsif Is_Type
(Ent
) then
5848 Decorate_Type
(Shadow
, Scop
, Is_Tagged
);
5850 -- If Ent is a private type and we are analyzing the body of its
5851 -- scope, its private and full views are swapped and, therefore,
5852 -- we need to undo this swapping in order to build the same shadow
5853 -- entity as we would have in other contexts.
5855 if Is_Private_Type
(Ent
)
5856 and then Present
(Full_View
(Ent
))
5857 and then In_Package_Body
(Scop
)
5859 Set_Non_Limited_View
(Shadow
, Full_View
(Ent
));
5861 Set_Non_Limited_View
(Shadow
, Ent
);
5865 Set_Non_Limited_View
5866 (Class_Wide_Type
(Shadow
), Class_Wide_Type
(Ent
));
5869 if Is_Incomplete_Or_Private_Type
(Ent
) then
5870 Set_Private_Dependents
(Shadow
, New_Elmt_List
);
5873 elsif Ekind
(Ent
) = E_Variable
then
5874 Decorate_State
(Shadow
, Scop
);
5875 Set_Non_Limited_View
(Shadow
, Ent
);
5877 end Build_Shadow_Entity
;
5879 ----------------------
5880 -- Decorate_Package --
5881 ----------------------
5883 procedure Decorate_Package
(Ent
: Entity_Id
; Scop
: Entity_Id
) is
5885 Mutate_Ekind
(Ent
, E_Package
);
5886 Set_Etype
(Ent
, Standard_Void_Type
);
5887 Set_Scope
(Ent
, Scop
);
5888 end Decorate_Package
;
5890 --------------------
5891 -- Decorate_State --
5892 --------------------
5894 procedure Decorate_State
(Ent
: Entity_Id
; Scop
: Entity_Id
) is
5896 Mutate_Ekind
(Ent
, E_Abstract_State
);
5897 Set_Etype
(Ent
, Standard_Void_Type
);
5898 Set_Scope
(Ent
, Scop
);
5899 Set_Encapsulating_State
(Ent
, Empty
);
5902 -----------------------
5903 -- Decorate_Variable --
5904 -----------------------
5906 procedure Decorate_Variable
(Ent
: Entity_Id
; Scop
: Entity_Id
) is
5908 Mutate_Ekind
(Ent
, E_Variable
);
5909 Set_Etype
(Ent
, Standard_Void_Type
);
5910 Set_Scope
(Ent
, Scop
);
5911 end Decorate_Variable
;
5913 -------------------------------------
5914 -- Process_Declarations_And_States --
5915 -------------------------------------
5917 procedure Process_Declarations_And_States
5921 Create_Abstract_Views
: Boolean)
5923 procedure Find_And_Process_States
;
5924 -- Determine whether package Pack defines abstract state either by
5925 -- using an aspect or a pragma. If this is the case, build shadow
5926 -- entities for all abstract states of Pack.
5928 procedure Process_States
(States
: Elist_Id
);
5929 -- Generate shadow entities for all abstract states in list States
5931 -----------------------------
5932 -- Find_And_Process_States --
5933 -----------------------------
5935 procedure Find_And_Process_States
is
5936 procedure Process_State
(State
: Node_Id
);
5937 -- Generate shadow entities for a single abstract state or
5938 -- multiple states expressed as an aggregate.
5944 procedure Process_State
(State
: Node_Id
) is
5945 Loc
: constant Source_Ptr
:= Sloc
(State
);
5952 -- Multiple abstract states appear as an aggregate
5954 if Nkind
(State
) = N_Aggregate
then
5955 Elmt
:= First
(Expressions
(State
));
5956 while Present
(Elmt
) loop
5957 Process_State
(Elmt
);
5963 -- A null state has no abstract view
5965 elsif Nkind
(State
) = N_Null
then
5968 -- State declaration with various options appears as an
5969 -- extension aggregate.
5971 elsif Nkind
(State
) = N_Extension_Aggregate
then
5972 Decl
:= Ancestor_Part
(State
);
5974 -- Simple state declaration
5976 elsif Nkind
(State
) = N_Identifier
then
5979 -- Possibly an illegal state declaration
5985 -- Abstract states are elaborated when the related pragma is
5986 -- elaborated. Since the withed package is not analyzed yet,
5987 -- the entities of the abstract states are not available. To
5988 -- overcome this complication, create the entities now and
5989 -- store them in their respective declarations. The entities
5990 -- are later used by routine Create_Abstract_State to declare
5991 -- and enter the states into visibility.
5993 if No
(Entity
(Decl
)) then
5994 Id
:= Make_Defining_Identifier
(Loc
, Chars
(Decl
));
5996 Set_Entity
(Decl
, Id
);
5997 Set_Parent
(Id
, State
);
5998 Decorate_State
(Id
, Scop
);
6000 -- Otherwise the package was previously withed
6003 Id
:= Entity
(Decl
);
6006 Build_Shadow_Entity
(Id
, Scop
, Dummy
);
6011 Pack_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Pack
);
6015 -- Start of processing for Find_And_Process_States
6018 -- Find aspect Abstract_State
6020 Asp
:= First
(Aspect_Specifications
(Pack_Decl
));
6021 while Present
(Asp
) loop
6022 if Chars
(Identifier
(Asp
)) = Name_Abstract_State
then
6023 Process_State
(Expression
(Asp
));
6031 -- Find pragma Abstract_State by inspecting the declarations
6033 Decl
:= First
(Decls
);
6034 while Present
(Decl
) and then Nkind
(Decl
) = N_Pragma
loop
6035 if Pragma_Name
(Decl
) = Name_Abstract_State
then
6038 (First
(Pragma_Argument_Associations
(Decl
))));
6045 end Find_And_Process_States
;
6047 --------------------
6048 -- Process_States --
6049 --------------------
6051 procedure Process_States
(States
: Elist_Id
) is
6056 Elmt
:= First_Elmt
(States
);
6057 while Present
(Elmt
) loop
6058 Build_Shadow_Entity
(Node
(Elmt
), Scop
, Dummy
);
6066 Is_Tagged
: Boolean;
6072 -- Start of processing for Process_Declarations_And_States
6075 -- Build abstract views for all states defined in the package
6077 if Create_Abstract_Views
then
6079 -- When a package has been analyzed, all states are stored in list
6080 -- Abstract_States. Generate the shadow entities directly.
6083 if Present
(Abstract_States
(Pack
)) then
6084 Process_States
(Abstract_States
(Pack
));
6087 -- The package may declare abstract states by using an aspect or a
6088 -- pragma. Attempt to locate one of these construct and if found,
6089 -- build the shadow entities.
6092 Find_And_Process_States
;
6096 -- Inspect the declarative list, looking for nested packages, types
6097 -- and variable declarations.
6099 Decl
:= First
(Decls
);
6100 while Present
(Decl
) loop
6104 if Nkind
(Decl
) = N_Package_Declaration
then
6105 Def_Id
:= Defining_Entity
(Decl
);
6107 -- Perform minor decoration when the withed package has not
6110 if not Is_Analyzed
then
6111 Decorate_Package
(Def_Id
, Scop
);
6114 -- Create a shadow entity that offers a limited view of all
6115 -- visible types declared within.
6117 Build_Shadow_Entity
(Def_Id
, Scop
, Shadow
);
6119 Process_Declarations_And_States
6122 Visible_Declarations
(Specification
(Decl
)),
6124 Create_Abstract_Views
=> Create_Abstract_Views
);
6128 elsif Nkind
(Decl
) in N_Full_Type_Declaration
6129 | N_Incomplete_Type_Declaration
6130 | N_Private_Extension_Declaration
6131 | N_Private_Type_Declaration
6132 | N_Protected_Type_Declaration
6133 | N_Task_Type_Declaration
6135 Def_Id
:= Defining_Entity
(Decl
);
6137 -- Determine whether the type is tagged. Note that packages
6138 -- included via a limited with clause are not always analyzed,
6139 -- hence the tree lookup rather than the use of attribute
6142 if Nkind
(Decl
) = N_Full_Type_Declaration
then
6143 Def
:= Type_Definition
(Decl
);
6146 (Nkind
(Def
) = N_Record_Definition
6147 and then Tagged_Present
(Def
))
6149 (Nkind
(Def
) = N_Derived_Type_Definition
6150 and then Present
(Record_Extension_Part
(Def
)));
6152 elsif Nkind
(Decl
) in N_Incomplete_Type_Declaration
6153 | N_Private_Type_Declaration
6155 Is_Tagged
:= Tagged_Present
(Decl
);
6157 elsif Nkind
(Decl
) = N_Private_Extension_Declaration
then
6164 -- Perform minor decoration when the withed package has not
6167 if not Is_Analyzed
then
6168 Decorate_Type
(Def_Id
, Scop
, Is_Tagged
, True);
6171 -- Create a shadow entity that hides the type and offers an
6172 -- incomplete view of the said type.
6174 Build_Shadow_Entity
(Def_Id
, Scop
, Shadow
, Is_Tagged
);
6178 elsif Create_Abstract_Views
6179 and then Nkind
(Decl
) = N_Object_Declaration
6180 and then not Constant_Present
(Decl
)
6182 Def_Id
:= Defining_Entity
(Decl
);
6184 -- Perform minor decoration when the withed package has not
6187 if not Is_Analyzed
then
6188 Decorate_Variable
(Def_Id
, Scop
);
6191 -- Create a shadow entity that hides the variable and offers an
6192 -- abstract view of the said variable.
6194 Build_Shadow_Entity
(Def_Id
, Scop
, Shadow
);
6199 end Process_Declarations_And_States
;
6203 Nam
: constant Node_Id
:= Name
(N
);
6204 Pack
: constant Entity_Id
:= Cunit_Entity
(Unum
);
6206 Last_Public_Shadow
: Entity_Id
:= Empty
;
6207 Private_Shadow
: Entity_Id
;
6210 -- Start of processing for Build_Limited_Views
6213 pragma Assert
(Limited_Present
(N
));
6215 -- A library_item mentioned in a limited_with_clause is a package
6216 -- declaration, not a subprogram declaration, generic declaration,
6217 -- generic instantiation, or package renaming declaration.
6219 case Nkind
(Unit
(Library_Unit
(N
))) is
6220 when N_Package_Declaration
=>
6223 when N_Subprogram_Declaration
=>
6225 ("subprogram not allowed in `LIMITED WITH` clause", N
);
6228 when N_Generic_Declaration
=>
6229 Error_Msg_N
("generic not allowed in `LIMITED WITH` clause", N
);
6232 when N_Generic_Instantiation
=>
6234 ("generic instantiation not allowed in `LIMITED WITH` clause",
6238 when N_Generic_Renaming_Declaration
=>
6240 ("generic renaming not allowed in `LIMITED WITH` clause", N
);
6243 when N_Subprogram_Renaming_Declaration
=>
6245 ("renamed subprogram not allowed in `LIMITED WITH` clause", N
);
6248 when N_Package_Renaming_Declaration
=>
6250 ("renamed package not allowed in `LIMITED WITH` clause", N
);
6254 raise Program_Error
;
6257 -- The withed unit may not be analyzed, but the with calause itself
6258 -- must be minimally decorated. This ensures that the checks on unused
6259 -- with clauses also process limieted withs.
6261 Mutate_Ekind
(Pack
, E_Package
);
6262 Set_Etype
(Pack
, Standard_Void_Type
);
6264 if Is_Entity_Name
(Nam
) then
6265 Set_Entity
(Nam
, Pack
);
6267 elsif Nkind
(Nam
) = N_Selected_Component
then
6268 Set_Entity
(Selector_Name
(Nam
), Pack
);
6271 -- Check if the chain is already built
6273 Spec
:= Specification
(Unit
(Library_Unit
(N
)));
6275 if Limited_View_Installed
(Spec
) then
6279 -- Create the shadow package wich hides the withed unit and provides
6280 -- incomplete view of all types and packages declared within.
6282 Shadow_Pack
:= Make_Temporary
(Sloc
(N
), 'Z');
6283 Mutate_Ekind
(Shadow_Pack
, E_Package
);
6284 Set_Is_Internal
(Shadow_Pack
);
6285 Set_Limited_View
(Pack
, Shadow_Pack
);
6287 -- Inspect the abstract states and visible declarations of the withed
6288 -- unit and create shadow entities that hide existing packages, states,
6289 -- variables and types.
6291 Process_Declarations_And_States
6293 Decls
=> Visible_Declarations
(Spec
),
6295 Create_Abstract_Views
=> True);
6297 Last_Public_Shadow
:= Last_Shadow
;
6299 -- Ada 2005 (AI-262): Build the limited view of the private declarations
6300 -- to accommodate limited private with clauses.
6302 Process_Declarations_And_States
6304 Decls
=> Private_Declarations
(Spec
),
6306 Create_Abstract_Views
=> False);
6308 if Present
(Last_Public_Shadow
) then
6309 Private_Shadow
:= Next_Entity
(Last_Public_Shadow
);
6311 Private_Shadow
:= First_Entity
(Shadow_Pack
);
6314 Set_First_Private_Entity
(Shadow_Pack
, Private_Shadow
);
6315 Set_Limited_View_Installed
(Spec
);
6316 end Build_Limited_Views
;
6318 ----------------------------
6319 -- Check_No_Elab_Code_All --
6320 ----------------------------
6322 procedure Check_No_Elab_Code_All
(N
: Node_Id
) is
6324 if Present
(No_Elab_Code_All_Pragma
)
6325 and then In_Extended_Main_Source_Unit
(N
)
6326 and then Present
(Context_Items
(N
))
6329 CL
: constant List_Id
:= Context_Items
(N
);
6334 while Present
(CI
) loop
6335 if Nkind
(CI
) = N_With_Clause
6337 No_Elab_Code_All
(Get_Source_Unit
(Library_Unit
(CI
)))
6339 -- In GNATprove mode, some runtime units are implicitly
6340 -- loaded to make their entities available for analysis. In
6341 -- this case, ignore violations of No_Elaboration_Code_All
6342 -- for this special analysis mode.
6345 (GNATprove_Mode
and then Implicit_With
(CI
))
6347 Error_Msg_Sloc
:= Sloc
(No_Elab_Code_All_Pragma
);
6349 ("violation of No_Elaboration_Code_All#", CI
);
6351 ("\unit& does not have No_Elaboration_Code_All",
6352 CI
, Entity
(Name
(CI
)));
6359 end Check_No_Elab_Code_All
;
6361 -------------------------------
6362 -- Check_Body_Needed_For_SAL --
6363 -------------------------------
6365 procedure Check_Body_Needed_For_SAL
(Unit_Name
: Entity_Id
) is
6366 function Entity_Needs_Body
(E
: Entity_Id
) return Boolean;
6367 -- Determine whether use of entity E might require the presence of its
6368 -- body. For a package this requires a recursive traversal of all nested
6371 -----------------------
6372 -- Entity_Needs_Body --
6373 -----------------------
6375 function Entity_Needs_Body
(E
: Entity_Id
) return Boolean is
6379 if Is_Subprogram
(E
) and then Has_Pragma_Inline
(E
) then
6382 elsif Is_Generic_Subprogram
(E
) then
6384 -- A generic subprogram always requires the presence of its
6385 -- body because an instantiation needs both templates. The only
6386 -- exceptions is a generic subprogram renaming. In this case the
6387 -- body is needed only when the template is declared outside the
6388 -- compilation unit being checked.
6390 if Present
(Renamed_Entity
(E
)) then
6391 return not Within_Scope
(E
, Unit_Name
);
6396 elsif Ekind
(E
) = E_Generic_Package
6398 Nkind
(Unit_Declaration_Node
(E
)) = N_Generic_Package_Declaration
6399 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(E
)))
6403 elsif Ekind
(E
) = E_Package
6404 and then Nkind
(Unit_Declaration_Node
(E
)) = N_Package_Declaration
6405 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(E
)))
6407 Ent
:= First_Entity
(E
);
6408 while Present
(Ent
) loop
6409 if Entity_Needs_Body
(Ent
) then
6421 end Entity_Needs_Body
;
6423 -- Start of processing for Check_Body_Needed_For_SAL
6426 if Ekind
(Unit_Name
) = E_Generic_Package
6427 and then Nkind
(Unit_Declaration_Node
(Unit_Name
)) =
6428 N_Generic_Package_Declaration
6430 Present
(Corresponding_Body
(Unit_Declaration_Node
(Unit_Name
)))
6432 Set_Body_Needed_For_SAL
(Unit_Name
);
6434 elsif Ekind
(Unit_Name
) in E_Generic_Procedure | E_Generic_Function
then
6435 Set_Body_Needed_For_SAL
(Unit_Name
);
6437 elsif Is_Subprogram
(Unit_Name
)
6438 and then Nkind
(Unit_Declaration_Node
(Unit_Name
)) =
6439 N_Subprogram_Declaration
6440 and then Has_Pragma_Inline
(Unit_Name
)
6442 Set_Body_Needed_For_SAL
(Unit_Name
);
6444 elsif Ekind
(Unit_Name
) = E_Subprogram_Body
then
6445 Check_Body_Needed_For_SAL
6446 (Corresponding_Spec
(Unit_Declaration_Node
(Unit_Name
)));
6448 elsif Ekind
(Unit_Name
) = E_Package
6449 and then Entity_Needs_Body
(Unit_Name
)
6451 Set_Body_Needed_For_SAL
(Unit_Name
);
6453 elsif Ekind
(Unit_Name
) = E_Package_Body
6454 and then Nkind
(Unit_Declaration_Node
(Unit_Name
)) = N_Package_Body
6456 Check_Body_Needed_For_SAL
6457 (Corresponding_Spec
(Unit_Declaration_Node
(Unit_Name
)));
6459 end Check_Body_Needed_For_SAL
;
6461 --------------------
6462 -- Remove_Context --
6463 --------------------
6465 procedure Remove_Context
(N
: Node_Id
) is
6466 Lib_Unit
: constant Node_Id
:= Unit
(N
);
6469 -- If this is a child unit, first remove the parent units
6471 if Is_Child_Spec
(Lib_Unit
) then
6472 Remove_Parents
(Lib_Unit
);
6475 Remove_Context_Clauses
(N
);
6478 ----------------------------
6479 -- Remove_Context_Clauses --
6480 ----------------------------
6482 procedure Remove_Context_Clauses
(N
: Node_Id
) is
6484 Unit_Name
: Entity_Id
;
6487 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
6488 -- limited-views first and regular-views later (to maintain the stack
6491 -- First Phase: Remove limited_with context clauses
6493 Item
:= First
(Context_Items
(N
));
6494 while Present
(Item
) loop
6496 -- We are interested only in with clauses that got installed on entry
6498 if Nkind
(Item
) = N_With_Clause
6499 and then Limited_Present
(Item
)
6501 if Limited_View_Installed
(Item
) then
6502 Remove_Limited_With_Clause
(Item
);
6504 -- An unusual case: If the library unit of the Main_Unit has a
6505 -- limited with_clause on some unit P and the context somewhere
6506 -- includes a with_clause on P, P has been analyzed. The entity
6507 -- for P is still visible, which in general is harmless because
6508 -- this is the end of the compilation, but it can affect pending
6509 -- instantiations that may have been generated elsewhere, so it
6510 -- it is necessary to remove U from visibility so that inlining
6511 -- and the analysis of instance bodies can proceed cleanly.
6513 elsif Current_Sem_Unit
= Main_Unit
6514 and then Serious_Errors_Detected
= 0
6515 and then not Implicit_With
(Item
)
6517 Set_Is_Immediately_Visible
6518 (Defining_Entity
(Unit
(Library_Unit
(Item
))), False);
6525 -- Second Phase: Loop through context items and undo regular
6526 -- with_clauses and use_clauses.
6528 Item
:= First
(Context_Items
(N
));
6529 while Present
(Item
) loop
6531 -- We are interested only in with clauses which got installed on
6532 -- entry, as indicated by their Context_Installed flag set
6534 if Nkind
(Item
) = N_With_Clause
6535 and then Limited_Present
(Item
)
6536 and then Limited_View_Installed
(Item
)
6540 elsif Nkind
(Item
) = N_With_Clause
6541 and then Context_Installed
(Item
)
6543 -- Remove items from one with'ed unit
6545 Unit_Name
:= Entity
(Name
(Item
));
6546 Remove_Unit_From_Visibility
(Unit_Name
);
6547 Set_Context_Installed
(Item
, False);
6549 elsif Nkind
(Item
) = N_Use_Package_Clause
then
6550 End_Use_Package
(Item
);
6552 elsif Nkind
(Item
) = N_Use_Type_Clause
then
6553 End_Use_Type
(Item
);
6558 end Remove_Context_Clauses
;
6560 --------------------------------
6561 -- Remove_Limited_With_Clause --
6562 --------------------------------
6564 procedure Remove_Limited_With_Clause
(N
: Node_Id
) is
6565 Pack_Decl
: constant Entity_Id
:= Unit
(Library_Unit
(N
));
6568 pragma Assert
(Limited_View_Installed
(N
));
6570 -- Limited with clauses that designate units other than packages are
6571 -- illegal and are never installed.
6573 if Nkind
(Pack_Decl
) = N_Package_Declaration
then
6574 Remove_Limited_With_Unit
(Pack_Decl
, N
);
6577 -- Indicate that the limited views of the clause have been removed
6579 Set_Limited_View_Installed
(N
, False);
6580 end Remove_Limited_With_Clause
;
6582 ------------------------------
6583 -- Remove_Limited_With_Unit --
6584 ------------------------------
6586 procedure Remove_Limited_With_Unit
6587 (Pack_Decl
: Node_Id
;
6588 Lim_Clause
: Node_Id
:= Empty
)
6590 procedure Remove_Shadow_Entities_From_Visibility
(Pack_Id
: Entity_Id
);
6591 -- Remove the shadow entities of package Pack_Id from direct visibility
6593 procedure Remove_Shadow_Entities_With_Restore
(Pack_Id
: Entity_Id
);
6594 -- Remove the shadow entities of package Pack_Id from direct visibility,
6595 -- restore the corresponding entities they hide into direct visibility,
6596 -- and update the entity and homonym chains.
6598 --------------------------------------------
6599 -- Remove_Shadow_Entities_From_Visibility --
6600 --------------------------------------------
6602 procedure Remove_Shadow_Entities_From_Visibility
(Pack_Id
: Entity_Id
) is
6603 Lim_Header
: constant Entity_Id
:= Limited_View
(Pack_Id
);
6604 Upto
: constant Entity_Id
:= First_Private_Entity
(Lim_Header
);
6609 -- Remove the package from direct visibility
6612 Set_Is_Immediately_Visible
(Pack_Id
, False);
6614 -- Remove all shadow entities from direct visibility
6616 Shadow
:= First_Entity
(Lim_Header
);
6617 while Present
(Shadow
) and then Shadow
/= Upto
loop
6619 Next_Entity
(Shadow
);
6621 end Remove_Shadow_Entities_From_Visibility
;
6623 -----------------------------------------
6624 -- Remove_Shadow_Entities_With_Restore --
6625 -----------------------------------------
6627 -- This code must be kept synchronized with the code that replaces the
6628 -- real entities by the shadow entities in Install_Limited_With_Clause,
6629 -- otherwise the contents of the homonym chains are not consistent.
6631 procedure Remove_Shadow_Entities_With_Restore
(Pack_Id
: Entity_Id
) is
6632 procedure Restore_Chain_For_Shadow
(Shadow
: Entity_Id
);
6633 -- Remove shadow entity Shadow by updating the entity and homonym
6636 procedure Restore_Chains
6639 -- Remove a sequence of shadow entities starting from From and ending
6640 -- prior to Upto by updating the entity and homonym chains.
6642 procedure Restore_Type_Visibility
6645 -- Restore a sequence of types starting from From and ending prior to
6646 -- Upto back in direct visibility.
6648 ------------------------------
6649 -- Restore_Chain_For_Shadow --
6650 ------------------------------
6652 procedure Restore_Chain_For_Shadow
(Shadow
: Entity_Id
) is
6658 -- If the package has incomplete types, the limited view of the
6659 -- incomplete type is in fact never visible (AI05-129) but we
6660 -- have created a shadow entity E1 for it, that points to E2,
6661 -- the incomplete type at stake. This in turn has a full view
6662 -- E3 that is the full declaration, with a corresponding
6663 -- shadow entity E4. When reinstalling the nonlimited view,
6664 -- the nonvisible entity E1 is first replaced with E2, but then
6665 -- E3 must *not* become the visible entity as it is replacing E4
6666 -- in the homonyms list and simply be ignored.
6668 -- regular views limited views
6670 -- * E2 (incomplete) <-- E1 (shadow)
6675 -- E3 (full) <-- E4 (shadow) *
6677 -- [*] denotes the visible entity (Current_Entity)
6679 Typ
:= Non_Limited_View
(Shadow
);
6680 pragma Assert
(not In_Chain
(Typ
));
6682 Is_E3
:= Nkind
(Parent
(Typ
)) = N_Full_Type_Declaration
6683 and then Present
(Incomplete_View
(Parent
(Typ
)));
6685 Prev
:= Current_Entity
(Shadow
);
6687 if Prev
= Shadow
then
6689 Set_Name_Entity_Id
(Chars
(Prev
), Homonym
(Prev
));
6693 Set_Current_Entity
(Typ
);
6697 while Present
(Homonym
(Prev
))
6698 and then Homonym
(Prev
) /= Shadow
6700 Prev
:= Homonym
(Prev
);
6704 Set_Homonym
(Prev
, Homonym
(Shadow
));
6708 Set_Homonym
(Prev
, Typ
);
6712 Set_Homonym
(Typ
, Homonym
(Shadow
));
6713 end Restore_Chain_For_Shadow
;
6715 --------------------
6716 -- Restore_Chains --
6717 --------------------
6719 procedure Restore_Chains
6727 while Present
(Shadow
) and then Shadow
/= Upto
loop
6729 -- Do not unchain nested packages and child units
6731 if Ekind
(Shadow
) = E_Package
then
6734 elsif Is_Child_Unit
(Non_Limited_View
(Shadow
)) then
6738 Restore_Chain_For_Shadow
(Shadow
);
6741 Next_Entity
(Shadow
);
6745 -----------------------------
6746 -- Restore_Type_Visibility --
6747 -----------------------------
6749 procedure Restore_Type_Visibility
6757 while Present
(Typ
) and then Typ
/= Upto
loop
6758 if Is_Type
(Typ
) then
6759 Set_Is_Hidden
(Typ
, Was_Hidden
(Typ
));
6764 end Restore_Type_Visibility
;
6768 Lim_Header
: constant Entity_Id
:= Limited_View
(Pack_Id
);
6770 -- Start of processing Remove_Shadow_Entities_With_Restore
6773 -- The limited view of a package is being uninstalled by removing
6774 -- the effects of a limited with clause. If the clause appears in a
6775 -- unit which is not part of the main unit closure, then the related
6776 -- package must not be visible.
6778 if Present
(Lim_Clause
)
6779 and then not In_Extended_Main_Source_Unit
(Lim_Clause
)
6781 Set_Is_Immediately_Visible
(Pack_Id
, False);
6783 -- Otherwise a limited view is being overridden by a nonlimited view.
6784 -- Leave the visibility of the package as is because the unit must be
6785 -- visible when the nonlimited view is installed.
6791 -- Remove the shadow entities from visibility by updating the entity
6792 -- and homonym chains.
6795 (From
=> First_Entity
(Lim_Header
),
6796 Upto
=> First_Private_Entity
(Lim_Header
));
6798 -- Reinstate the types that were hidden by the shadow entities back
6799 -- into direct visibility.
6801 Restore_Type_Visibility
6802 (From
=> First_Entity
(Pack_Id
),
6803 Upto
=> First_Private_Entity
(Pack_Id
));
6804 end Remove_Shadow_Entities_With_Restore
;
6808 Pack_Id
: constant Entity_Id
:= Defining_Entity
(Pack_Decl
);
6810 -- Start of processing for Remove_Limited_With_Unit
6813 -- Nothing to do when the limited view of the package is not installed
6815 if not From_Limited_With
(Pack_Id
) then
6819 if Debug_Flag_I
then
6820 Write_Str
("remove limited view of ");
6821 Write_Name
(Chars
(Pack_Id
));
6822 Write_Str
(" from visibility");
6826 -- The package already appears in the compilation closure. As a result,
6827 -- its shadow entities must be replaced by the real entities they hide
6828 -- and the previously hidden entities must be entered back into direct
6831 if Analyzed
(Pack_Decl
) then
6832 Remove_Shadow_Entities_With_Restore
(Pack_Id
);
6834 -- Otherwise the package is not analyzed and its shadow entities must be
6835 -- removed from direct visibility.
6838 Remove_Shadow_Entities_From_Visibility
(Pack_Id
);
6841 -- Indicate that the limited view of the package is not installed
6843 Set_From_Limited_With
(Pack_Id
, False);
6844 end Remove_Limited_With_Unit
;
6846 --------------------
6847 -- Remove_Parents --
6848 --------------------
6850 procedure Remove_Parents
(Lib_Unit
: Node_Id
) is
6853 P_Spec
: Node_Id
:= Empty
;
6855 Vis
: constant Boolean :=
6856 Scope_Stack
.Table
(Scope_Stack
.Last
).Previous_Visibility
;
6859 if Is_Child_Spec
(Lib_Unit
) then
6860 P_Spec
:= Parent_Spec
(Lib_Unit
);
6862 elsif Nkind
(Lib_Unit
) = N_Package_Body
6863 and then Nkind
(Original_Node
(Lib_Unit
)) = N_Package_Instantiation
6865 P_Spec
:= Parent_Spec
(Original_Node
(Lib_Unit
));
6868 if Present
(P_Spec
) then
6870 P_Name
:= Get_Parent_Entity
(P
);
6871 Remove_Context_Clauses
(P_Spec
);
6872 End_Package_Scope
(P_Name
);
6873 Set_Is_Immediately_Visible
(P_Name
, Vis
);
6875 -- Remove from visibility the siblings as well, which are directly
6876 -- visible while the parent is in scope.
6878 E
:= First_Entity
(P_Name
);
6879 while Present
(E
) loop
6880 if Is_Child_Unit
(E
) then
6881 Set_Is_Immediately_Visible
(E
, False);
6887 Set_In_Package_Body
(P_Name
, False);
6889 -- This is the recursive call to remove the context of any higher
6890 -- level parent. This recursion ensures that all parents are removed
6891 -- in the reverse order of their installation.
6897 ---------------------------------
6898 -- Remove_Private_With_Clauses --
6899 ---------------------------------
6901 procedure Remove_Private_With_Clauses
(Comp_Unit
: Node_Id
) is
6904 function In_Regular_With_Clause
(E
: Entity_Id
) return Boolean;
6905 -- Check whether a given unit appears in a regular with_clause. Used to
6906 -- determine whether a private_with_clause, implicit or explicit, should
6909 ----------------------------
6910 -- In_Regular_With_Clause --
6911 ----------------------------
6913 function In_Regular_With_Clause
(E
: Entity_Id
) return Boolean is
6917 Item
:= First
(Context_Items
(Comp_Unit
));
6919 while Present
(Item
) loop
6920 if Nkind
(Item
) = N_With_Clause
6922 -- The following guard is needed to ensure that the name has
6923 -- been properly analyzed before we go fetching its entity.
6925 and then Is_Entity_Name
(Name
(Item
))
6926 and then Entity
(Name
(Item
)) = E
6927 and then not Private_Present
(Item
)
6936 end In_Regular_With_Clause
;
6938 -- Start of processing for Remove_Private_With_Clauses
6941 Item
:= First
(Context_Items
(Comp_Unit
));
6942 while Present
(Item
) loop
6943 if Nkind
(Item
) = N_With_Clause
and then Private_Present
(Item
) then
6945 -- If private_with_clause is redundant, remove it from context,
6946 -- as a small optimization to subsequent handling of private_with
6947 -- clauses in other nested packages. We replace the clause with
6948 -- a null statement, which is otherwise ignored by the rest of
6951 if In_Regular_With_Clause
(Entity
(Name
(Item
))) then
6953 Nxt
: constant Node_Id
:= Next
(Item
);
6955 Rewrite
(Item
, Make_Null_Statement
(Sloc
(Item
)));
6960 elsif Limited_Present
(Item
) then
6961 if not Limited_View_Installed
(Item
) then
6962 Remove_Limited_With_Clause
(Item
);
6968 Remove_Unit_From_Visibility
(Entity
(Name
(Item
)));
6969 Set_Context_Installed
(Item
, False);
6977 end Remove_Private_With_Clauses
;
6979 ---------------------------------
6980 -- Remove_Unit_From_Visibility --
6981 ---------------------------------
6983 procedure Remove_Unit_From_Visibility
(Unit_Name
: Entity_Id
) is
6985 if Debug_Flag_I
then
6986 Write_Str
("remove unit ");
6987 Write_Name
(Chars
(Unit_Name
));
6988 Write_Str
(" from visibility");
6992 Set_Is_Visible_Lib_Unit
(Unit_Name
, False);
6993 Set_Is_Potentially_Use_Visible
(Unit_Name
, False);
6994 Set_Is_Immediately_Visible
(Unit_Name
, False);
6996 -- If the unit is a wrapper package, the subprogram instance is
6997 -- what must be removed from visibility.
6998 -- Should we use Related_Instance instead???
7000 if Is_Wrapper_Package
(Unit_Name
) then
7001 Set_Is_Immediately_Visible
(Current_Entity
(Unit_Name
), False);
7003 end Remove_Unit_From_Visibility
;
7018 procedure Unchain
(E
: Entity_Id
) is
7022 Prev
:= Current_Entity
(E
);
7028 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
7031 while Present
(Prev
) and then Homonym
(Prev
) /= E
loop
7032 Prev
:= Homonym
(Prev
);
7035 if Present
(Prev
) then
7036 Set_Homonym
(Prev
, Homonym
(E
));
7040 if Debug_Flag_I
then
7041 Write_Str
(" (homonym) unchain ");
7042 Write_Name
(Chars
(E
));