1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2005, 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 2, 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 COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 with Atree
; use Atree
;
28 with Debug
; use Debug
;
29 with Einfo
; use Einfo
;
30 with Errout
; use Errout
;
31 with Exp_Util
; use Exp_Util
;
32 with Fname
; use Fname
;
33 with Fname
.UF
; use Fname
.UF
;
34 with Freeze
; use Freeze
;
35 with Impunit
; use Impunit
;
36 with Inline
; use Inline
;
38 with Lib
.Load
; use Lib
.Load
;
39 with Lib
.Xref
; use Lib
.Xref
;
40 with Namet
; use Namet
;
41 with Nlists
; use Nlists
;
42 with Nmake
; use Nmake
;
44 with Output
; use Output
;
45 with Restrict
; use Restrict
;
46 with Rtsfind
; use Rtsfind
;
48 with Sem_Ch6
; use Sem_Ch6
;
49 with Sem_Ch7
; use Sem_Ch7
;
50 with Sem_Ch8
; use Sem_Ch8
;
51 with Sem_Dist
; use Sem_Dist
;
52 with Sem_Prag
; use Sem_Prag
;
53 with Sem_Util
; use Sem_Util
;
54 with Sem_Warn
; use Sem_Warn
;
55 with Stand
; use Stand
;
56 with Sinfo
; use Sinfo
;
57 with Sinfo
.CN
; use Sinfo
.CN
;
58 with Sinput
; use Sinput
;
59 with Snames
; use Snames
;
60 with Style
; use Style
;
61 with Stylesw
; use Stylesw
;
62 with Tbuild
; use Tbuild
;
63 with Ttypes
; use Ttypes
;
64 with Uname
; use Uname
;
66 package body Sem_Ch10
is
68 -----------------------
69 -- Local Subprograms --
70 -----------------------
72 procedure Analyze_Context
(N
: Node_Id
);
73 -- Analyzes items in the context clause of compilation unit
75 procedure Build_Limited_Views
(N
: Node_Id
);
76 -- Build and decorate the list of shadow entities for a package mentioned
77 -- in a limited_with clause. If the package was not previously analyzed
78 -- then it also performs a basic decoration of the real entities; this
79 -- is required to do not pass non-decorated entities to the back-end.
80 -- Implements Ada 2005 (AI-50217).
82 procedure Check_Body_Needed_For_SAL
(Unit_Name
: Entity_Id
);
83 -- Check whether the source for the body of a compilation unit must
84 -- be included in a standalone library.
86 procedure Check_With_Type_Clauses
(N
: Node_Id
);
87 -- If N is a body, verify that any with_type clauses on the spec, or
88 -- on the spec of any parent, have a matching with_clause.
90 procedure Check_Private_Child_Unit
(N
: Node_Id
);
91 -- If a with_clause mentions a private child unit, the compilation
92 -- unit must be a member of the same family, as described in 10.1.2 (8).
94 procedure Check_Stub_Level
(N
: Node_Id
);
95 -- Verify that a stub is declared immediately within a compilation unit,
96 -- and not in an inner frame.
98 procedure Expand_With_Clause
(Item
: Node_Id
; Nam
: Node_Id
; N
: Node_Id
);
99 -- When a child unit appears in a context clause, the implicit withs on
100 -- parents are made explicit, and with clauses are inserted in the context
101 -- clause before the one for the child. If a parent in the with_clause
102 -- is a renaming, the implicit with_clause is on the renaming whose name
103 -- is mentioned in the with_clause, and not on the package it renames.
104 -- N is the compilation unit whose list of context items receives the
105 -- implicit with_clauses.
107 function Get_Parent_Entity
(Unit
: Node_Id
) return Entity_Id
;
108 -- Get defining entity of parent unit of a child unit. In most cases this
109 -- is the defining entity of the unit, but for a child instance whose
110 -- parent needs a body for inlining, the instantiation node of the parent
111 -- has not yet been rewritten as a package declaration, and the entity has
112 -- to be retrieved from the Instance_Spec of the unit.
114 procedure Implicit_With_On_Parent
(Child_Unit
: Node_Id
; N
: Node_Id
);
115 -- If the main unit is a child unit, implicit withs are also added for
116 -- all its ancestors.
118 function In_Chain
(E
: Entity_Id
) return Boolean;
119 -- Check that the shadow entity is not already in the homonym chain, for
120 -- example through a limited_with clause in a parent unit.
122 procedure Install_Context_Clauses
(N
: Node_Id
);
123 -- Subsidiary to Install_Context and Install_Parents. Process only with_
124 -- and use_clauses for current unit and its library unit if any.
126 procedure Install_Limited_Context_Clauses
(N
: Node_Id
);
127 -- Subsidiary to Install_Context. Process only limited with_clauses
128 -- for current unit. Implements Ada 2005 (AI-50217).
130 procedure Install_Limited_Withed_Unit
(N
: Node_Id
);
131 -- Place shadow entities for a limited_with package in the visibility
132 -- structures for the current compilation. Implements Ada 2005 (AI-50217).
134 procedure Install_Withed_Unit
135 (With_Clause
: Node_Id
;
136 Private_With_OK
: Boolean := False);
137 -- If the unit is not a child unit, make unit immediately visible.
138 -- The caller ensures that the unit is not already currently installed.
139 -- The flag Private_With_OK is set true in Install_Private_With_Clauses,
140 -- which is called when compiling the private part of a package, or
141 -- installing the private declarations of a parent unit.
143 procedure Install_Parents
(Lib_Unit
: Node_Id
; Is_Private
: Boolean);
144 -- This procedure establishes the context for the compilation of a child
145 -- unit. If Lib_Unit is a child library spec then the context of the parent
146 -- is installed, and the parent itself made immediately visible, so that
147 -- the child unit is processed in the declarative region of the parent.
148 -- Install_Parents makes a recursive call to itself to ensure that all
149 -- parents are loaded in the nested case. If Lib_Unit is a library body,
150 -- the only effect of Install_Parents is to install the private decls of
151 -- the parents, because the visible parent declarations will have been
152 -- installed as part of the context of the corresponding spec.
154 procedure Install_Siblings
(U_Name
: Entity_Id
; N
: Node_Id
);
155 -- In the compilation of a child unit, a child of any of the ancestor
156 -- units is directly visible if it is visible, because the parent is in
157 -- an enclosing scope. Iterate over context to find child units of U_Name
158 -- or of some ancestor of it.
160 function Is_Child_Spec
(Lib_Unit
: Node_Id
) return Boolean;
161 -- Lib_Unit is a library unit which may be a spec or a body. Is_Child_Spec
162 -- returns True if Lib_Unit is a library spec which is a child spec, i.e.
163 -- a library spec that has a parent. If the call to Is_Child_Spec returns
164 -- True, then Parent_Spec (Lib_Unit) is non-Empty and points to the
165 -- compilation unit for the parent spec.
167 -- Lib_Unit can also be a subprogram body that acts as its own spec. If
168 -- the Parent_Spec is non-empty, this is also a child unit.
170 procedure Remove_With_Type_Clause
(Name
: Node_Id
);
171 -- Remove imported type and its enclosing package from visibility, and
172 -- remove attributes of imported type so they don't interfere with its
173 -- analysis (should it appear otherwise in the context).
175 procedure Remove_Context_Clauses
(N
: Node_Id
);
176 -- Subsidiary of previous one. Remove use_ and with_clauses
178 procedure Remove_Limited_With_Clause
(N
: Node_Id
);
179 -- Remove from visibility the shadow entities introduced for a package
180 -- mentioned in a limited_with clause. Implements Ada 2005 (AI-50217).
182 procedure Remove_Parents
(Lib_Unit
: Node_Id
);
183 -- Remove_Parents checks if Lib_Unit is a child spec. If so then the parent
184 -- contexts established by the corresponding call to Install_Parents are
185 -- removed. Remove_Parents contains a recursive call to itself to ensure
186 -- that all parents are removed in the nested case.
188 procedure Remove_Unit_From_Visibility
(Unit_Name
: Entity_Id
);
189 -- Reset all visibility flags on unit after compiling it, either as a
190 -- main unit or as a unit in the context.
192 procedure Unchain
(E
: Entity_Id
);
193 -- Remove single entity from visibility list
195 procedure Analyze_Proper_Body
(N
: Node_Id
; Nam
: Entity_Id
);
196 -- Common processing for all stubs (subprograms, tasks, packages, and
197 -- protected cases). N is the stub to be analyzed. Once the subunit
198 -- name is established, load and analyze. Nam is the non-overloadable
199 -- entity for which the proper body provides a completion. Subprogram
200 -- stubs are handled differently because they can be declarations.
202 --------------------------
203 -- Limited_With_Clauses --
204 --------------------------
206 -- Limited_With clauses are the mechanism chosen for Ada05 to support
207 -- mutually recursive types declared in different units. A limited_with
208 -- clause that names package P in the context of unit U makes the types
209 -- declared in the visible part of P available within U, but with the
210 -- restriction that these types can only be used as incomplete types.
211 -- The limited_with clause does not impose a semantic dependence on P,
212 -- and it is possible for two packages to have limited_with_clauses on
213 -- each other without creating an elaboration circularity.
215 -- To support this feature, the analysis of a limited_with clause must
216 -- create an abbreviated view of the package, without performing any
217 -- semantic analysis on it. This "package abstract" contains shadow
218 -- types that are in one-one correspondence with the real types in the
219 -- package, and that have the properties of incomplete types.
221 -- The implementation creates two element lists: one to chain the shadow
222 -- entities, and one to chain the corresponding type entities in the tree
223 -- of the package. Links between corresponding entities in both chains
224 -- allow the compiler to select the proper view of a given type, depending
225 -- on the context. Note that in contrast with the handling of private
226 -- types, the limited view and the non-limited view of a type are treated
227 -- as separate entities, and no entity exchange needs to take place, which
228 -- makes the implementation must simpler than could be feared.
230 ------------------------------
231 -- Analyze_Compilation_Unit --
232 ------------------------------
234 procedure Analyze_Compilation_Unit
(N
: Node_Id
) is
235 Unit_Node
: constant Node_Id
:= Unit
(N
);
236 Lib_Unit
: Node_Id
:= Library_Unit
(N
);
238 Main_Cunit
: constant Node_Id
:= Cunit
(Main_Unit
);
239 Par_Spec_Name
: Unit_Name_Type
;
240 Unum
: Unit_Number_Type
;
242 procedure Generate_Parent_References
(N
: Node_Id
; P_Id
: Entity_Id
);
243 -- Generate cross-reference information for the parents of child units.
244 -- N is a defining_program_unit_name, and P_Id is the immediate parent.
246 --------------------------------
247 -- Generate_Parent_References --
248 --------------------------------
250 procedure Generate_Parent_References
(N
: Node_Id
; P_Id
: Entity_Id
) is
252 P_Name
: Entity_Id
:= P_Id
;
255 Pref
:= Name
(Parent
(Defining_Entity
(N
)));
257 if Nkind
(Pref
) = N_Expanded_Name
then
259 -- Done already, if the unit has been compiled indirectly as
260 -- part of the closure of its context because of inlining.
265 while Nkind
(Pref
) = N_Selected_Component
loop
266 Change_Selected_Component_To_Expanded_Name
(Pref
);
267 Set_Entity
(Pref
, P_Name
);
268 Set_Etype
(Pref
, Etype
(P_Name
));
269 Generate_Reference
(P_Name
, Pref
, 'r');
270 Pref
:= Prefix
(Pref
);
271 P_Name
:= Scope
(P_Name
);
274 -- The guard here on P_Name is to handle the error condition where
275 -- the parent unit is missing because the file was not found.
277 if Present
(P_Name
) then
278 Set_Entity
(Pref
, P_Name
);
279 Set_Etype
(Pref
, Etype
(P_Name
));
280 Generate_Reference
(P_Name
, Pref
, 'r');
281 Style
.Check_Identifier
(Pref
, P_Name
);
283 end Generate_Parent_References
;
285 -- Start of processing for Analyze_Compilation_Unit
288 Process_Compilation_Unit_Pragmas
(N
);
290 -- If the unit is a subunit whose parent has not been analyzed (which
291 -- indicates that the main unit is a subunit, either the current one or
292 -- one of its descendents) then the subunit is compiled as part of the
293 -- analysis of the parent, which we proceed to do. Basically this gets
294 -- handled from the top down and we don't want to do anything at this
295 -- level (i.e. this subunit will be handled on the way down from the
296 -- parent), so at this level we immediately return. If the subunit
297 -- ends up not analyzed, it means that the parent did not contain a
298 -- stub for it, or that there errors were dectected in some ancestor.
300 if Nkind
(Unit_Node
) = N_Subunit
301 and then not Analyzed
(Lib_Unit
)
303 Semantics
(Lib_Unit
);
305 if not Analyzed
(Proper_Body
(Unit_Node
)) then
306 if Serious_Errors_Detected
> 0 then
307 Error_Msg_N
("subunit not analyzed (errors in parent unit)", N
);
309 Error_Msg_N
("missing stub for subunit", N
);
316 -- Analyze context (this will call Sem recursively for with'ed units)
320 -- If the unit is a package body, the spec is already loaded and must
321 -- be analyzed first, before we analyze the body.
323 if Nkind
(Unit_Node
) = N_Package_Body
then
325 -- If no Lib_Unit, then there was a serious previous error, so
326 -- just ignore the entire analysis effort
328 if No
(Lib_Unit
) then
332 Semantics
(Lib_Unit
);
333 Check_Unused_Withs
(Get_Cunit_Unit_Number
(Lib_Unit
));
335 -- Verify that the library unit is a package declaration
337 if Nkind
(Unit
(Lib_Unit
)) /= N_Package_Declaration
339 Nkind
(Unit
(Lib_Unit
)) /= N_Generic_Package_Declaration
342 ("no legal package declaration for package body", N
);
345 -- Otherwise, the entity in the declaration is visible. Update
346 -- the version to reflect dependence of this body on the spec.
349 Spec_Id
:= Defining_Entity
(Unit
(Lib_Unit
));
350 Set_Is_Immediately_Visible
(Spec_Id
, True);
351 Version_Update
(N
, Lib_Unit
);
353 if Nkind
(Defining_Unit_Name
(Unit_Node
))
354 = N_Defining_Program_Unit_Name
356 Generate_Parent_References
(Unit_Node
, Scope
(Spec_Id
));
361 -- If the unit is a subprogram body, then we similarly need to analyze
362 -- its spec. However, things are a little simpler in this case, because
363 -- here, this analysis is done only for error checking and consistency
364 -- purposes, so there's nothing else to be done.
366 elsif Nkind
(Unit_Node
) = N_Subprogram_Body
then
367 if Acts_As_Spec
(N
) then
369 -- If the subprogram body is a child unit, we must create a
370 -- declaration for it, in order to properly load the parent(s).
371 -- After this, the original unit does not acts as a spec, because
372 -- there is an explicit one. If this unit appears in a context
373 -- clause, then an implicit with on the parent will be added when
374 -- installing the context. If this is the main unit, there is no
375 -- Unit_Table entry for the declaration, (It has the unit number
376 -- of the main unit) and code generation is unaffected.
378 Unum
:= Get_Cunit_Unit_Number
(N
);
379 Par_Spec_Name
:= Get_Parent_Spec_Name
(Unit_Name
(Unum
));
381 if Par_Spec_Name
/= No_Name
then
384 (Load_Name
=> Par_Spec_Name
,
389 if Unum
/= No_Unit
then
391 -- Build subprogram declaration and attach parent unit to it
392 -- This subprogram declaration does not come from source,
393 -- Nevertheless the backend must generate debugging info for
394 -- it, and this must be indicated explicitly.
397 Loc
: constant Source_Ptr
:= Sloc
(N
);
398 SCS
: constant Boolean :=
399 Get_Comes_From_Source_Default
;
402 Set_Comes_From_Source_Default
(False);
404 Make_Compilation_Unit
(Loc
,
405 Context_Items
=> New_Copy_List
(Context_Items
(N
)),
407 Make_Subprogram_Declaration
(Sloc
(N
),
410 (Specification
(Unit_Node
))),
412 Make_Compilation_Unit_Aux
(Loc
));
414 Set_Library_Unit
(N
, Lib_Unit
);
415 Set_Parent_Spec
(Unit
(Lib_Unit
), Cunit
(Unum
));
416 Semantics
(Lib_Unit
);
417 Set_Acts_As_Spec
(N
, False);
418 Set_Needs_Debug_Info
(Defining_Entity
(Unit
(Lib_Unit
)));
419 Set_Comes_From_Source_Default
(SCS
);
424 -- Here for subprogram with separate declaration
427 Semantics
(Lib_Unit
);
428 Check_Unused_Withs
(Get_Cunit_Unit_Number
(Lib_Unit
));
429 Version_Update
(N
, Lib_Unit
);
432 if Nkind
(Defining_Unit_Name
(Specification
(Unit_Node
))) =
433 N_Defining_Program_Unit_Name
435 Generate_Parent_References
(
436 Specification
(Unit_Node
),
437 Scope
(Defining_Entity
(Unit
(Lib_Unit
))));
441 -- If it is a child unit, the parent must be elaborated first
442 -- and we update version, since we are dependent on our parent.
444 if Is_Child_Spec
(Unit_Node
) then
446 -- The analysis of the parent is done with style checks off
449 Save_Style_Check
: constant Boolean := Style_Check
;
450 Save_C_Restrict
: constant Save_Cunit_Boolean_Restrictions
:=
451 Cunit_Boolean_Restrictions_Save
;
454 if not GNAT_Mode
then
455 Style_Check
:= False;
458 Semantics
(Parent_Spec
(Unit_Node
));
459 Version_Update
(N
, Parent_Spec
(Unit_Node
));
460 Style_Check
:= Save_Style_Check
;
461 Cunit_Boolean_Restrictions_Restore
(Save_C_Restrict
);
465 -- With the analysis done, install the context. Note that we can't
466 -- install the context from the with clauses as we analyze them,
467 -- because each with clause must be analyzed in a clean visibility
468 -- context, so we have to wait and install them all at once.
472 if Is_Child_Spec
(Unit_Node
) then
474 -- Set the entities of all parents in the program_unit_name
476 Generate_Parent_References
(
477 Unit_Node
, Get_Parent_Entity
(Unit
(Parent_Spec
(Unit_Node
))));
480 -- All components of the context: with-clauses, library unit, ancestors
481 -- if any, (and their context) are analyzed and installed. Now analyze
482 -- the unit itself, which is either a package, subprogram spec or body.
486 -- The above call might have made Unit_Node an N_Subprogram_Body
487 -- from something else, so propagate any Acts_As_Spec flag.
489 if Nkind
(Unit_Node
) = N_Subprogram_Body
490 and then Acts_As_Spec
(Unit_Node
)
492 Set_Acts_As_Spec
(N
);
495 -- Register predefined units in Rtsfind
498 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(Sloc
(N
));
500 if Is_Predefined_File_Name
(Unit_File_Name
(Unum
)) then
501 Set_RTU_Loaded
(Unit_Node
);
505 -- Treat compilation unit pragmas that appear after the library unit
507 if Present
(Pragmas_After
(Aux_Decls_Node
(N
))) then
509 Prag_Node
: Node_Id
:= First
(Pragmas_After
(Aux_Decls_Node
(N
)));
512 while Present
(Prag_Node
) loop
519 -- Generate distribution stubs if requested and no error
522 and then (Distribution_Stub_Mode
= Generate_Receiver_Stub_Body
524 Distribution_Stub_Mode
= Generate_Caller_Stub_Body
)
525 and then not Fatal_Error
(Main_Unit
)
527 if Is_RCI_Pkg_Spec_Or_Body
(N
) then
529 -- Regular RCI package
531 Add_Stub_Constructs
(N
);
533 elsif (Nkind
(Unit_Node
) = N_Package_Declaration
534 and then Is_Shared_Passive
(Defining_Entity
535 (Specification
(Unit_Node
))))
536 or else (Nkind
(Unit_Node
) = N_Package_Body
538 Is_Shared_Passive
(Corresponding_Spec
(Unit_Node
)))
540 -- Shared passive package
542 Add_Stub_Constructs
(N
);
544 elsif Nkind
(Unit_Node
) = N_Package_Instantiation
546 Is_Remote_Call_Interface
547 (Defining_Entity
(Specification
(Instance_Spec
(Unit_Node
))))
549 -- Instantiation of a RCI generic package
551 Add_Stub_Constructs
(N
);
556 if Nkind
(Unit_Node
) = N_Package_Declaration
557 or else Nkind
(Unit_Node
) in N_Generic_Declaration
558 or else Nkind
(Unit_Node
) = N_Package_Renaming_Declaration
559 or else Nkind
(Unit_Node
) = N_Subprogram_Declaration
561 Remove_Unit_From_Visibility
(Defining_Entity
(Unit_Node
));
563 -- If the unit is an instantiation whose body will be elaborated
564 -- for inlining purposes, use the the proper entity of the instance.
566 elsif Nkind
(Unit_Node
) = N_Package_Instantiation
567 and then not Error_Posted
(Unit_Node
)
569 Remove_Unit_From_Visibility
570 (Defining_Entity
(Instance_Spec
(Unit_Node
)));
572 elsif Nkind
(Unit_Node
) = N_Package_Body
573 or else (Nkind
(Unit_Node
) = N_Subprogram_Body
574 and then not Acts_As_Spec
(Unit_Node
))
576 -- Bodies that are not the main unit are compiled if they
577 -- are generic or contain generic or inlined units. Their
578 -- analysis brings in the context of the corresponding spec
579 -- (unit declaration) which must be removed as well, to
580 -- return the compilation environment to its proper state.
582 Remove_Context
(Lib_Unit
);
583 Set_Is_Immediately_Visible
(Defining_Entity
(Unit
(Lib_Unit
)), False);
586 -- Last step is to deinstall the context we just installed
587 -- as well as the unit just compiled.
591 -- If this is the main unit and we are generating code, we must
592 -- check that all generic units in the context have a body if they
593 -- need it, even if they have not been instantiated. In the absence
594 -- of .ali files for generic units, we must force the load of the body,
595 -- just to produce the proper error if the body is absent. We skip this
596 -- verification if the main unit itself is generic.
598 if Get_Cunit_Unit_Number
(N
) = Main_Unit
599 and then Operating_Mode
= Generate_Code
600 and then Expander_Active
602 -- Check whether the source for the body of the unit must be
603 -- included in a standalone library.
605 Check_Body_Needed_For_SAL
(Cunit_Entity
(Main_Unit
));
607 -- Indicate that the main unit is now analyzed, to catch possible
608 -- circularities between it and generic bodies. Remove main unit
609 -- from visibility. This might seem superfluous, but the main unit
610 -- must not be visible in the generic body expansions that follow.
612 Set_Analyzed
(N
, True);
613 Set_Is_Immediately_Visible
(Cunit_Entity
(Main_Unit
), False);
618 Un
: Unit_Number_Type
;
620 Save_Style_Check
: constant Boolean := Style_Check
;
621 Save_C_Restrict
: constant Save_Cunit_Boolean_Restrictions
:=
622 Cunit_Boolean_Restrictions_Save
;
625 Item
:= First
(Context_Items
(N
));
626 while Present
(Item
) loop
628 -- Ada 2005 (AI-50217): Do not consider limited-withed units
630 if Nkind
(Item
) = N_With_Clause
631 and then not Implicit_With
(Item
)
632 and then not Limited_Present
(Item
)
634 Nam
:= Entity
(Name
(Item
));
636 if (Is_Generic_Subprogram
(Nam
)
637 and then not Is_Intrinsic_Subprogram
(Nam
))
638 or else (Ekind
(Nam
) = E_Generic_Package
639 and then Unit_Requires_Body
(Nam
))
641 Style_Check
:= False;
643 if Present
(Renamed_Object
(Nam
)) then
646 (Load_Name
=> Get_Body_Name
648 (Unit_Declaration_Node
649 (Renamed_Object
(Nam
)))),
657 (Load_Name
=> Get_Body_Name
658 (Get_Unit_Name
(Item
)),
667 ("body of generic unit& not found", Item
, Nam
);
670 elsif not Analyzed
(Cunit
(Un
))
671 and then Un
/= Main_Unit
672 and then not Fatal_Error
(Un
)
674 Style_Check
:= False;
675 Semantics
(Cunit
(Un
));
683 Style_Check
:= Save_Style_Check
;
684 Cunit_Boolean_Restrictions_Restore
(Save_C_Restrict
);
688 -- Deal with creating elaboration Boolean if needed. We create an
689 -- elaboration boolean only for units that come from source since
690 -- units manufactured by the compiler never need elab checks.
692 if Comes_From_Source
(N
)
694 (Nkind
(Unit
(N
)) = N_Package_Declaration
or else
695 Nkind
(Unit
(N
)) = N_Generic_Package_Declaration
or else
696 Nkind
(Unit
(N
)) = N_Subprogram_Declaration
or else
697 Nkind
(Unit
(N
)) = N_Generic_Subprogram_Declaration
)
700 Loc
: constant Source_Ptr
:= Sloc
(N
);
701 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(Loc
);
704 Spec_Id
:= Defining_Entity
(Unit
(N
));
705 Generate_Definition
(Spec_Id
);
707 -- See if an elaboration entity is required for possible
708 -- access before elaboration checking. Note that we must
709 -- allow for this even if -gnatE is not set, since a client
710 -- may be compiled in -gnatE mode and reference the entity.
712 -- Case of units which do not require elaboration checks
715 -- Pure units do not need checks
719 -- Preelaborated units do not need checks
721 or else Is_Preelaborated
(Spec_Id
)
723 -- No checks needed if pagma Elaborate_Body present
725 or else Has_Pragma_Elaborate_Body
(Spec_Id
)
727 -- No checks needed if unit does not require a body
729 or else not Unit_Requires_Body
(Spec_Id
)
731 -- No checks needed for predefined files
733 or else Is_Predefined_File_Name
(Unit_File_Name
(Unum
))
735 -- No checks required if no separate spec
737 or else Acts_As_Spec
(N
)
739 -- This is a case where we only need the entity for
740 -- checking to prevent multiple elaboration checks.
742 Set_Elaboration_Entity_Required
(Spec_Id
, False);
744 -- Case of elaboration entity is required for access before
745 -- elaboration checking (so certainly we must build it!)
748 Set_Elaboration_Entity_Required
(Spec_Id
, True);
751 Build_Elaboration_Entity
(N
, Spec_Id
);
755 -- Finally, freeze the compilation unit entity. This for sure is needed
756 -- because of some warnings that can be output (see Freeze_Subprogram),
757 -- but may in general be required. If freezing actions result, place
758 -- them in the compilation unit actions list, and analyze them.
761 Loc
: constant Source_Ptr
:= Sloc
(N
);
762 L
: constant List_Id
:=
763 Freeze_Entity
(Cunit_Entity
(Current_Sem_Unit
), Loc
);
766 while Is_Non_Empty_List
(L
) loop
767 Insert_Library_Level_Action
(Remove_Head
(L
));
773 if Nkind
(Unit_Node
) = N_Package_Declaration
774 and then Get_Cunit_Unit_Number
(N
) /= Main_Unit
775 and then Expander_Active
778 Save_Style_Check
: constant Boolean := Style_Check
;
779 Save_Warning
: constant Warning_Mode_Type
:= Warning_Mode
;
780 Options
: Style_Check_Options
;
783 Save_Style_Check_Options
(Options
);
784 Reset_Style_Check_Options
;
785 Opt
.Warning_Mode
:= Suppress
;
786 Check_Body_For_Inlining
(N
, Defining_Entity
(Unit_Node
));
788 Reset_Style_Check_Options
;
789 Set_Style_Check_Options
(Options
);
790 Style_Check
:= Save_Style_Check
;
791 Warning_Mode
:= Save_Warning
;
794 end Analyze_Compilation_Unit
;
796 ---------------------
797 -- Analyze_Context --
798 ---------------------
800 procedure Analyze_Context
(N
: Node_Id
) is
801 Ukind
: constant Node_Kind
:= Nkind
(Unit
(N
));
805 -- Loop through context items. This is done in two:
806 -- a) The first pass analyzes non-limited with-clauses
807 -- b) The second pass analyzes limited_with clauses (Ada 2005: AI-50217)
809 Item
:= First
(Context_Items
(N
));
810 while Present
(Item
) loop
812 -- For with clause, analyze the with clause, and then update
813 -- the version, since we are dependent on a unit that we with.
815 if Nkind
(Item
) = N_With_Clause
816 and then not Limited_Present
(Item
)
818 -- Skip analyzing with clause if no unit, nothing to do (this
819 -- happens for a with that references a non-existant unit)
821 if Present
(Library_Unit
(Item
)) then
825 if not Implicit_With
(Item
) then
826 Version_Update
(N
, Library_Unit
(Item
));
829 -- But skip use clauses at this stage, since we don't want to do
830 -- any installing of potentially use visible entities until we
831 -- we actually install the complete context (in Install_Context).
832 -- Otherwise things can get installed in the wrong context.
833 -- Similarly, pragmas are analyzed in Install_Context, after all
834 -- the implicit with's on parent units are generated.
843 -- Second pass: examine all limited_with clauses
845 Item
:= First
(Context_Items
(N
));
846 while Present
(Item
) loop
847 if Nkind
(Item
) = N_With_Clause
848 and then Limited_Present
(Item
)
850 -- No need to check errors on implicitly generated limited-with
853 if not Implicit_With
(Item
) then
855 -- Check compilation unit containing the limited-with clause
857 if Ukind
/= N_Package_Declaration
858 and then Ukind
/= N_Subprogram_Declaration
859 and then Ukind
/= N_Package_Renaming_Declaration
860 and then Ukind
/= N_Subprogram_Renaming_Declaration
861 and then Ukind
not in N_Generic_Declaration
862 and then Ukind
not in N_Generic_Renaming_Declaration
863 and then Ukind
not in N_Generic_Instantiation
865 Error_Msg_N
("limited with_clause not allowed here", Item
);
867 -- Check wrong use of a limited with clause applied to the
868 -- compilation unit containing the limited-with clause.
871 -- package P.Q is ...
873 elsif Unit
(Library_Unit
(Item
)) = Unit
(N
) then
874 Error_Msg_N
("wrong use of limited-with clause", Item
);
876 -- Check wrong use of limited-with clause applied to some
877 -- immediate ancestor.
879 elsif Is_Child_Spec
(Unit
(N
)) then
881 Lib_U
: constant Entity_Id
:= Unit
(Library_Unit
(Item
));
885 P
:= Parent_Spec
(Unit
(N
));
887 if Unit
(P
) = Lib_U
then
888 Error_Msg_N
("limited with_clause of immediate "
889 & "ancestor not allowed", Item
);
893 exit when not Is_Child_Spec
(Unit
(P
));
894 P
:= Parent_Spec
(Unit
(P
));
899 -- Check if the limited-withed unit is already visible through
900 -- some context clause of the current compilation unit or some
901 -- ancestor of the current compilation unit.
904 Lim_Unit_Name
: constant Node_Id
:= Name
(Item
);
912 It
:= First
(Context_Items
(Comp_Unit
));
913 while Present
(It
) loop
915 and then Nkind
(It
) = N_With_Clause
916 and then not Limited_Present
(It
)
918 (Nkind
(Unit
(Library_Unit
(It
)))
919 = N_Package_Declaration
921 Nkind
(Unit
(Library_Unit
(It
)))
922 = N_Package_Renaming_Declaration
)
924 if Nkind
(Unit
(Library_Unit
(It
)))
925 = N_Package_Declaration
927 Unit_Name
:= Name
(It
);
929 Unit_Name
:= Name
(Unit
(Library_Unit
(It
)));
932 -- Check if the named package (or some ancestor)
933 -- leaves visible the full-view of the unit given
934 -- in the limited-with clause
937 if Designate_Same_Unit
(Lim_Unit_Name
,
940 Error_Msg_Sloc
:= Sloc
(It
);
942 ("unlimited view visible through the"
943 & " context clause found #",
946 ("simultaneous visibility of the limited"
947 & " and unlimited views not allowed"
951 elsif Nkind
(Unit_Name
) = N_Identifier
then
955 Unit_Name
:= Prefix
(Unit_Name
);
962 exit when not Is_Child_Spec
(Unit
(Comp_Unit
));
964 Comp_Unit
:= Parent_Spec
(Unit
(Comp_Unit
));
969 -- Skip analyzing with clause if no unit, see above
971 if Present
(Library_Unit
(Item
)) then
975 -- A limited_with does not impose an elaboration order, but
976 -- there is a semantic dependency for recompilation purposes.
978 if not Implicit_With
(Item
) then
979 Version_Update
(N
, Library_Unit
(Item
));
987 -------------------------------
988 -- Analyze_Package_Body_Stub --
989 -------------------------------
991 procedure Analyze_Package_Body_Stub
(N
: Node_Id
) is
992 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
996 -- The package declaration must be in the current declarative part
998 Check_Stub_Level
(N
);
999 Nam
:= Current_Entity_In_Scope
(Id
);
1001 if No
(Nam
) or else not Is_Package_Or_Generic_Package
(Nam
) then
1002 Error_Msg_N
("missing specification for package stub", N
);
1004 elsif Has_Completion
(Nam
)
1005 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(Nam
)))
1007 Error_Msg_N
("duplicate or redundant stub for package", N
);
1010 -- Indicate that the body of the package exists. If we are doing
1011 -- only semantic analysis, the stub stands for the body. If we are
1012 -- generating code, the existence of the body will be confirmed
1013 -- when we load the proper body.
1015 Set_Has_Completion
(Nam
);
1016 Set_Scope
(Defining_Entity
(N
), Current_Scope
);
1017 Generate_Reference
(Nam
, Id
, 'b');
1018 Analyze_Proper_Body
(N
, Nam
);
1020 end Analyze_Package_Body_Stub
;
1022 -------------------------
1023 -- Analyze_Proper_Body --
1024 -------------------------
1026 procedure Analyze_Proper_Body
(N
: Node_Id
; Nam
: Entity_Id
) is
1027 Subunit_Name
: constant Unit_Name_Type
:= Get_Unit_Name
(N
);
1028 Unum
: Unit_Number_Type
;
1030 procedure Optional_Subunit
;
1031 -- This procedure is called when the main unit is a stub, or when we
1032 -- are not generating code. In such a case, we analyze the subunit if
1033 -- present, which is user-friendly and in fact required for ASIS, but
1034 -- we don't complain if the subunit is missing.
1036 ----------------------
1037 -- Optional_Subunit --
1038 ----------------------
1040 procedure Optional_Subunit
is
1041 Comp_Unit
: Node_Id
;
1044 -- Try to load subunit, but ignore any errors that occur during
1045 -- the loading of the subunit, by using the special feature in
1046 -- Errout to ignore all errors. Note that Fatal_Error will still
1047 -- be set, so we will be able to check for this case below.
1049 if not ASIS_Mode
then
1050 Ignore_Errors_Enable
:= Ignore_Errors_Enable
+ 1;
1055 (Load_Name
=> Subunit_Name
,
1060 if not ASIS_Mode
then
1061 Ignore_Errors_Enable
:= Ignore_Errors_Enable
- 1;
1064 -- All done if we successfully loaded the subunit
1067 and then (not Fatal_Error
(Unum
) or else Try_Semantics
)
1069 Comp_Unit
:= Cunit
(Unum
);
1071 -- If the file was empty or seriously mangled, the unit
1072 -- itself may be missing.
1074 if No
(Unit
(Comp_Unit
)) then
1076 ("subunit does not contain expected proper body", N
);
1078 elsif Nkind
(Unit
(Comp_Unit
)) /= N_Subunit
then
1080 ("expected SEPARATE subunit, found child unit",
1081 Cunit_Entity
(Unum
));
1083 Set_Corresponding_Stub
(Unit
(Comp_Unit
), N
);
1084 Analyze_Subunit
(Comp_Unit
);
1085 Set_Library_Unit
(N
, Comp_Unit
);
1088 elsif Unum
= No_Unit
1089 and then Present
(Nam
)
1091 if Is_Protected_Type
(Nam
) then
1092 Set_Corresponding_Body
(Parent
(Nam
), Defining_Identifier
(N
));
1094 Set_Corresponding_Body
(
1095 Unit_Declaration_Node
(Nam
), Defining_Identifier
(N
));
1098 end Optional_Subunit
;
1100 -- Start of processing for Analyze_Proper_Body
1103 -- If the subunit is already loaded, it means that the main unit
1104 -- is a subunit, and that the current unit is one of its parents
1105 -- which was being analyzed to provide the needed context for the
1106 -- analysis of the subunit. In this case we analyze the subunit and
1107 -- continue with the parent, without looking a subsequent subunits.
1109 if Is_Loaded
(Subunit_Name
) then
1111 -- If the proper body is already linked to the stub node,
1112 -- the stub is in a generic unit and just needs analyzing.
1114 if Present
(Library_Unit
(N
)) then
1115 Set_Corresponding_Stub
(Unit
(Library_Unit
(N
)), N
);
1116 Analyze_Subunit
(Library_Unit
(N
));
1118 -- Otherwise we must load the subunit and link to it
1121 -- Load the subunit, this must work, since we originally
1122 -- loaded the subunit earlier on. So this will not really
1123 -- load it, just give access to it.
1127 (Load_Name
=> Subunit_Name
,
1132 -- And analyze the subunit in the parent context (note that we
1133 -- do not call Semantics, since that would remove the parent
1134 -- context). Because of this, we have to manually reset the
1135 -- compiler state to Analyzing since it got destroyed by Load.
1137 if Unum
/= No_Unit
then
1138 Compiler_State
:= Analyzing
;
1140 -- Check that the proper body is a subunit and not a child
1141 -- unit. If the unit was previously loaded, the error will
1142 -- have been emitted when copying the generic node, so we
1143 -- just return to avoid cascaded errors.
1145 if Nkind
(Unit
(Cunit
(Unum
))) /= N_Subunit
then
1149 Set_Corresponding_Stub
(Unit
(Cunit
(Unum
)), N
);
1150 Analyze_Subunit
(Cunit
(Unum
));
1151 Set_Library_Unit
(N
, Cunit
(Unum
));
1155 -- If the main unit is a subunit, then we are just performing semantic
1156 -- analysis on that subunit, and any other subunits of any parent unit
1157 -- should be ignored, except that if we are building trees for ASIS
1158 -- usage we want to annotate the stub properly.
1160 elsif Nkind
(Unit
(Cunit
(Main_Unit
))) = N_Subunit
1161 and then Subunit_Name
/= Unit_Name
(Main_Unit
)
1167 -- But before we return, set the flag for unloaded subunits. This
1168 -- will suppress junk warnings of variables in the same declarative
1169 -- part (or a higher level one) that are in danger of looking unused
1170 -- when in fact there might be a declaration in the subunit that we
1171 -- do not intend to load.
1173 Unloaded_Subunits
:= True;
1176 -- If the subunit is not already loaded, and we are generating code,
1177 -- then this is the case where compilation started from the parent,
1178 -- and we are generating code for an entire subunit tree. In that
1179 -- case we definitely need to load the subunit.
1181 -- In order to continue the analysis with the rest of the parent,
1182 -- and other subunits, we load the unit without requiring its
1183 -- presence, and emit a warning if not found, rather than terminating
1184 -- the compilation abruptly, as for other missing file problems.
1186 elsif Original_Operating_Mode
= Generate_Code
then
1188 -- If the proper body is already linked to the stub node,
1189 -- the stub is in a generic unit and just needs analyzing.
1191 -- We update the version. Although we are not technically
1192 -- semantically dependent on the subunit, given our approach
1193 -- of macro substitution of subunits, it makes sense to
1194 -- include it in the version identification.
1196 if Present
(Library_Unit
(N
)) then
1197 Set_Corresponding_Stub
(Unit
(Library_Unit
(N
)), N
);
1198 Analyze_Subunit
(Library_Unit
(N
));
1199 Version_Update
(Cunit
(Main_Unit
), Library_Unit
(N
));
1201 -- Otherwise we must load the subunit and link to it
1206 (Load_Name
=> Subunit_Name
,
1211 if Original_Operating_Mode
= Generate_Code
1212 and then Unum
= No_Unit
1214 Error_Msg_Name_1
:= Subunit_Name
;
1216 Get_File_Name
(Subunit_Name
, Subunit
=> True);
1218 ("subunit% in file{ not found!?", N
);
1219 Subunits_Missing
:= True;
1222 -- Load_Unit may reset Compiler_State, since it may have been
1223 -- necessary to parse an additional units, so we make sure
1224 -- that we reset it to the Analyzing state.
1226 Compiler_State
:= Analyzing
;
1229 and then (not Fatal_Error
(Unum
) or else Try_Semantics
)
1231 if Debug_Flag_L
then
1232 Write_Str
("*** Loaded subunit from stub. Analyze");
1237 Comp_Unit
: constant Node_Id
:= Cunit
(Unum
);
1240 -- Check for child unit instead of subunit
1242 if Nkind
(Unit
(Comp_Unit
)) /= N_Subunit
then
1244 ("expected SEPARATE subunit, found child unit",
1245 Cunit_Entity
(Unum
));
1247 -- OK, we have a subunit, so go ahead and analyze it,
1248 -- and set Scope of entity in stub, for ASIS use.
1251 Set_Corresponding_Stub
(Unit
(Comp_Unit
), N
);
1252 Analyze_Subunit
(Comp_Unit
);
1253 Set_Library_Unit
(N
, Comp_Unit
);
1255 -- We update the version. Although we are not technically
1256 -- semantically dependent on the subunit, given our
1257 -- approach of macro substitution of subunits, it makes
1258 -- sense to include it in the version identification.
1260 Version_Update
(Cunit
(Main_Unit
), Comp_Unit
);
1266 -- The remaining case is when the subunit is not already loaded and
1267 -- we are not generating code. In this case we are just performing
1268 -- semantic analysis on the parent, and we are not interested in
1269 -- the subunit. For subprograms, analyze the stub as a body. For
1270 -- other entities the stub has already been marked as completed.
1276 end Analyze_Proper_Body
;
1278 ----------------------------------
1279 -- Analyze_Protected_Body_Stub --
1280 ----------------------------------
1282 procedure Analyze_Protected_Body_Stub
(N
: Node_Id
) is
1283 Nam
: Entity_Id
:= Current_Entity_In_Scope
(Defining_Identifier
(N
));
1286 Check_Stub_Level
(N
);
1288 -- First occurence of name may have been as an incomplete type
1290 if Present
(Nam
) and then Ekind
(Nam
) = E_Incomplete_Type
then
1291 Nam
:= Full_View
(Nam
);
1295 or else not Is_Protected_Type
(Etype
(Nam
))
1297 Error_Msg_N
("missing specification for Protected body", N
);
1299 Set_Scope
(Defining_Entity
(N
), Current_Scope
);
1300 Set_Has_Completion
(Etype
(Nam
));
1301 Generate_Reference
(Nam
, Defining_Identifier
(N
), 'b');
1302 Analyze_Proper_Body
(N
, Etype
(Nam
));
1304 end Analyze_Protected_Body_Stub
;
1306 ----------------------------------
1307 -- Analyze_Subprogram_Body_Stub --
1308 ----------------------------------
1310 -- A subprogram body stub can appear with or without a previous
1311 -- specification. If there is one, the analysis of the body will
1312 -- find it and verify conformance. The formals appearing in the
1313 -- specification of the stub play no role, except for requiring an
1314 -- additional conformance check. If there is no previous subprogram
1315 -- declaration, the stub acts as a spec, and provides the defining
1316 -- entity for the subprogram.
1318 procedure Analyze_Subprogram_Body_Stub
(N
: Node_Id
) is
1322 Check_Stub_Level
(N
);
1324 -- Verify that the identifier for the stub is unique within this
1325 -- declarative part.
1327 if Nkind
(Parent
(N
)) = N_Block_Statement
1328 or else Nkind
(Parent
(N
)) = N_Package_Body
1329 or else Nkind
(Parent
(N
)) = N_Subprogram_Body
1331 Decl
:= First
(Declarations
(Parent
(N
)));
1332 while Present
(Decl
)
1335 if Nkind
(Decl
) = N_Subprogram_Body_Stub
1336 and then (Chars
(Defining_Unit_Name
(Specification
(Decl
)))
1337 = Chars
(Defining_Unit_Name
(Specification
(N
))))
1339 Error_Msg_N
("identifier for stub is not unique", N
);
1346 -- Treat stub as a body, which checks conformance if there is a previous
1347 -- declaration, or else introduces entity and its signature.
1349 Analyze_Subprogram_Body
(N
);
1350 Analyze_Proper_Body
(N
, Empty
);
1351 end Analyze_Subprogram_Body_Stub
;
1353 ---------------------
1354 -- Analyze_Subunit --
1355 ---------------------
1357 -- A subunit is compiled either by itself (for semantic checking)
1358 -- or as part of compiling the parent (for code generation). In
1359 -- either case, by the time we actually process the subunit, the
1360 -- parent has already been installed and analyzed. The node N is
1361 -- a compilation unit, whose context needs to be treated here,
1362 -- because we come directly here from the parent without calling
1363 -- Analyze_Compilation_Unit.
1365 -- The compilation context includes the explicit context of the
1366 -- subunit, and the context of the parent, together with the parent
1367 -- itself. In order to compile the current context, we remove the
1368 -- one inherited from the parent, in order to have a clean visibility
1369 -- table. We restore the parent context before analyzing the proper
1370 -- body itself. On exit, we remove only the explicit context of the
1373 procedure Analyze_Subunit
(N
: Node_Id
) is
1374 Lib_Unit
: constant Node_Id
:= Library_Unit
(N
);
1375 Par_Unit
: constant Entity_Id
:= Current_Scope
;
1377 Lib_Spec
: Node_Id
:= Library_Unit
(Lib_Unit
);
1378 Num_Scopes
: Int
:= 0;
1379 Use_Clauses
: array (1 .. Scope_Stack
.Last
) of Node_Id
;
1380 Enclosing_Child
: Entity_Id
:= Empty
;
1381 Svg
: constant Suppress_Array
:= Scope_Suppress
;
1383 procedure Analyze_Subunit_Context
;
1384 -- Capture names in use clauses of the subunit. This must be done
1385 -- before re-installing parent declarations, because items in the
1386 -- context must not be hidden by declarations local to the parent.
1388 procedure Re_Install_Parents
(L
: Node_Id
; Scop
: Entity_Id
);
1389 -- Recursive procedure to restore scope of all ancestors of subunit,
1390 -- from outermost in. If parent is not a subunit, the call to install
1391 -- context installs context of spec and (if parent is a child unit)
1392 -- the context of its parents as well. It is confusing that parents
1393 -- should be treated differently in both cases, but the semantics are
1394 -- just not identical.
1396 procedure Re_Install_Use_Clauses
;
1397 -- As part of the removal of the parent scope, the use clauses are
1398 -- removed, to be reinstalled when the context of the subunit has
1399 -- been analyzed. Use clauses may also have been affected by the
1400 -- analysis of the context of the subunit, so they have to be applied
1401 -- again, to insure that the compilation environment of the rest of
1402 -- the parent unit is identical.
1404 procedure Remove_Scope
;
1405 -- Remove current scope from scope stack, and preserve the list
1406 -- of use clauses in it, to be reinstalled after context is analyzed.
1408 -----------------------------
1409 -- Analyze_Subunit_Context --
1410 -----------------------------
1412 procedure Analyze_Subunit_Context
is
1415 Unit_Name
: Entity_Id
;
1418 Analyze_Context
(N
);
1420 -- Make withed units immediately visible. If child unit, make the
1421 -- ultimate parent immediately visible.
1423 Item
:= First
(Context_Items
(N
));
1424 while Present
(Item
) loop
1425 if Nkind
(Item
) = N_With_Clause
then
1427 -- Protect frontend against previous errors in context clauses
1429 if Nkind
(Name
(Item
)) /= N_Selected_Component
then
1430 Unit_Name
:= Entity
(Name
(Item
));
1431 while Is_Child_Unit
(Unit_Name
) loop
1432 Set_Is_Visible_Child_Unit
(Unit_Name
);
1433 Unit_Name
:= Scope
(Unit_Name
);
1436 if not Is_Immediately_Visible
(Unit_Name
) then
1437 Set_Is_Immediately_Visible
(Unit_Name
);
1438 Set_Context_Installed
(Item
);
1442 elsif Nkind
(Item
) = N_Use_Package_Clause
then
1443 Nam
:= First
(Names
(Item
));
1444 while Present
(Nam
) loop
1449 elsif Nkind
(Item
) = N_Use_Type_Clause
then
1450 Nam
:= First
(Subtype_Marks
(Item
));
1451 while Present
(Nam
) loop
1460 -- Reset visibility of withed units. They will be made visible
1461 -- again when we install the subunit context.
1463 Item
:= First
(Context_Items
(N
));
1464 while Present
(Item
) loop
1465 if Nkind
(Item
) = N_With_Clause
1467 -- Protect frontend against previous errors in context clauses
1469 and then Nkind
(Name
(Item
)) /= N_Selected_Component
1471 Unit_Name
:= Entity
(Name
(Item
));
1472 while Is_Child_Unit
(Unit_Name
) loop
1473 Set_Is_Visible_Child_Unit
(Unit_Name
, False);
1474 Unit_Name
:= Scope
(Unit_Name
);
1477 if Context_Installed
(Item
) then
1478 Set_Is_Immediately_Visible
(Unit_Name
, False);
1479 Set_Context_Installed
(Item
, False);
1485 end Analyze_Subunit_Context
;
1487 ------------------------
1488 -- Re_Install_Parents --
1489 ------------------------
1491 procedure Re_Install_Parents
(L
: Node_Id
; Scop
: Entity_Id
) is
1495 if Nkind
(Unit
(L
)) = N_Subunit
then
1496 Re_Install_Parents
(Library_Unit
(L
), Scope
(Scop
));
1499 Install_Context
(L
);
1501 -- If the subunit occurs within a child unit, we must restore the
1502 -- immediate visibility of any siblings that may occur in context.
1504 if Present
(Enclosing_Child
) then
1505 Install_Siblings
(Enclosing_Child
, L
);
1510 if Scop
/= Par_Unit
then
1511 Set_Is_Immediately_Visible
(Scop
);
1514 -- Make entities in scope visible again. For child units, restore
1515 -- visibility only if they are actually in context.
1517 E
:= First_Entity
(Current_Scope
);
1518 while Present
(E
) loop
1519 if not Is_Child_Unit
(E
)
1520 or else Is_Visible_Child_Unit
(E
)
1522 Set_Is_Immediately_Visible
(E
);
1528 -- A subunit appears within a body, and for a nested subunits
1529 -- all the parents are bodies. Restore full visibility of their
1530 -- private entities.
1532 if Ekind
(Scop
) = E_Package
then
1533 Set_In_Package_Body
(Scop
);
1534 Install_Private_Declarations
(Scop
);
1536 end Re_Install_Parents
;
1538 ----------------------------
1539 -- Re_Install_Use_Clauses --
1540 ----------------------------
1542 procedure Re_Install_Use_Clauses
is
1545 for J
in reverse 1 .. Num_Scopes
loop
1546 U
:= Use_Clauses
(J
);
1547 Scope_Stack
.Table
(Scope_Stack
.Last
- J
+ 1).First_Use_Clause
:= U
;
1548 Install_Use_Clauses
(U
, Force_Installation
=> True);
1550 end Re_Install_Use_Clauses
;
1556 procedure Remove_Scope
is
1560 Num_Scopes
:= Num_Scopes
+ 1;
1561 Use_Clauses
(Num_Scopes
) :=
1562 Scope_Stack
.Table
(Scope_Stack
.Last
).First_Use_Clause
;
1564 E
:= First_Entity
(Current_Scope
);
1565 while Present
(E
) loop
1566 Set_Is_Immediately_Visible
(E
, False);
1570 if Is_Child_Unit
(Current_Scope
) then
1571 Enclosing_Child
:= Current_Scope
;
1577 -- Start of processing for Analyze_Subunit
1580 if not Is_Empty_List
(Context_Items
(N
)) then
1582 -- Save current use clauses
1585 Remove_Context
(Lib_Unit
);
1587 -- Now remove parents and their context, including enclosing
1588 -- subunits and the outer parent body which is not a subunit.
1590 if Present
(Lib_Spec
) then
1591 Remove_Context
(Lib_Spec
);
1593 while Nkind
(Unit
(Lib_Spec
)) = N_Subunit
loop
1594 Lib_Spec
:= Library_Unit
(Lib_Spec
);
1596 Remove_Context
(Lib_Spec
);
1599 if Nkind
(Unit
(Lib_Unit
)) = N_Subunit
then
1603 if Nkind
(Unit
(Lib_Spec
)) = N_Package_Body
then
1604 Remove_Context
(Library_Unit
(Lib_Spec
));
1608 Set_Is_Immediately_Visible
(Par_Unit
, False);
1610 Analyze_Subunit_Context
;
1612 Re_Install_Parents
(Lib_Unit
, Par_Unit
);
1613 Set_Is_Immediately_Visible
(Par_Unit
);
1615 -- If the context includes a child unit of the parent of the
1616 -- subunit, the parent will have been removed from visibility,
1617 -- after compiling that cousin in the context. The visibility
1618 -- of the parent must be restored now. This also applies if the
1619 -- context includes another subunit of the same parent which in
1620 -- turn includes a child unit in its context.
1622 if Ekind
(Par_Unit
) = E_Package
then
1623 if not Is_Immediately_Visible
(Par_Unit
)
1624 or else (Present
(First_Entity
(Par_Unit
))
1625 and then not Is_Immediately_Visible
1626 (First_Entity
(Par_Unit
)))
1628 Set_Is_Immediately_Visible
(Par_Unit
);
1629 Install_Visible_Declarations
(Par_Unit
);
1630 Install_Private_Declarations
(Par_Unit
);
1634 Re_Install_Use_Clauses
;
1635 Install_Context
(N
);
1637 -- Restore state of suppress flags for current body
1639 Scope_Suppress
:= Svg
;
1641 -- If the subunit is within a child unit, then siblings of any
1642 -- parent unit that appear in the context clause of the subunit
1643 -- must also be made immediately visible.
1645 if Present
(Enclosing_Child
) then
1646 Install_Siblings
(Enclosing_Child
, N
);
1651 Analyze
(Proper_Body
(Unit
(N
)));
1653 end Analyze_Subunit
;
1655 ----------------------------
1656 -- Analyze_Task_Body_Stub --
1657 ----------------------------
1659 procedure Analyze_Task_Body_Stub
(N
: Node_Id
) is
1660 Nam
: Entity_Id
:= Current_Entity_In_Scope
(Defining_Identifier
(N
));
1661 Loc
: constant Source_Ptr
:= Sloc
(N
);
1664 Check_Stub_Level
(N
);
1666 -- First occurence of name may have been as an incomplete type
1668 if Present
(Nam
) and then Ekind
(Nam
) = E_Incomplete_Type
then
1669 Nam
:= Full_View
(Nam
);
1673 or else not Is_Task_Type
(Etype
(Nam
))
1675 Error_Msg_N
("missing specification for task body", N
);
1677 Set_Scope
(Defining_Entity
(N
), Current_Scope
);
1678 Generate_Reference
(Nam
, Defining_Identifier
(N
), 'b');
1679 Set_Has_Completion
(Etype
(Nam
));
1680 Analyze_Proper_Body
(N
, Etype
(Nam
));
1682 -- Set elaboration flag to indicate that entity is callable.
1683 -- This cannot be done in the expansion of the body itself,
1684 -- because the proper body is not in a declarative part. This
1685 -- is only done if expansion is active, because the context
1686 -- may be generic and the flag not defined yet.
1688 if Expander_Active
then
1690 Make_Assignment_Statement
(Loc
,
1692 Make_Identifier
(Loc
,
1693 New_External_Name
(Chars
(Etype
(Nam
)), 'E')),
1694 Expression
=> New_Reference_To
(Standard_True
, Loc
)));
1698 end Analyze_Task_Body_Stub
;
1700 -------------------------
1701 -- Analyze_With_Clause --
1702 -------------------------
1704 -- Analyze the declaration of a unit in a with clause. At end,
1705 -- label the with clause with the defining entity for the unit.
1707 procedure Analyze_With_Clause
(N
: Node_Id
) is
1709 -- Retrieve the original kind of the unit node, before analysis.
1710 -- If it is a subprogram instantiation, its analysis below will
1711 -- rewrite as the declaration of the wrapper package. If the same
1712 -- instantiation appears indirectly elsewhere in the context, it
1713 -- will have been analyzed already.
1715 Unit_Kind
: constant Node_Kind
:=
1716 Nkind
(Original_Node
(Unit
(Library_Unit
(N
))));
1719 Par_Name
: Entity_Id
;
1724 -- Set True if the unit currently being compiled is an internal unit
1726 Save_Style_Check
: constant Boolean := Opt
.Style_Check
;
1727 Save_C_Restrict
: constant Save_Cunit_Boolean_Restrictions
:=
1728 Cunit_Boolean_Restrictions_Save
;
1731 if Limited_Present
(N
) then
1733 -- Ada 2005 (AI-50217): Build visibility structures but do not
1736 Build_Limited_Views
(N
);
1740 -- We reset ordinary style checking during the analysis of a with'ed
1741 -- unit, but we do NOT reset GNAT special analysis mode (the latter
1742 -- definitely *does* apply to with'ed units).
1744 if not GNAT_Mode
then
1745 Style_Check
:= False;
1748 -- If the library unit is a predefined unit, and we are in high
1749 -- integrity mode, then temporarily reset Configurable_Run_Time_Mode
1750 -- for the analysis of the with'ed unit. This mode does not prevent
1751 -- explicit with'ing of run-time units.
1753 if Configurable_Run_Time_Mode
1755 Is_Predefined_File_Name
1756 (Unit_File_Name
(Get_Source_Unit
(Unit
(Library_Unit
(N
)))))
1758 Configurable_Run_Time_Mode
:= False;
1759 Semantics
(Library_Unit
(N
));
1760 Configurable_Run_Time_Mode
:= True;
1763 Semantics
(Library_Unit
(N
));
1766 U
:= Unit
(Library_Unit
(N
));
1767 Check_Restriction_No_Dependence
(Name
(N
), N
);
1768 Intunit
:= Is_Internal_File_Name
(Unit_File_Name
(Current_Sem_Unit
));
1770 -- Following checks are skipped for dummy packages (those supplied
1771 -- for with's where no matching file could be found). Such packages
1772 -- are identified by the Sloc value being set to No_Location
1774 if Sloc
(U
) /= No_Location
then
1776 -- Check restrictions, except that we skip the check if this
1777 -- is an internal unit unless we are compiling the internal
1778 -- unit as the main unit. We also skip this for dummy packages.
1780 if not Intunit
or else Current_Sem_Unit
= Main_Unit
then
1781 Check_Restricted_Unit
(Unit_Name
(Get_Source_Unit
(U
)), N
);
1784 -- Check for inappropriate with of internal implementation unit
1785 -- if we are currently compiling the main unit and the main unit
1786 -- is itself not an internal unit. We do not issue this message
1787 -- for implicit with's generated by the compiler itself.
1789 if Implementation_Unit_Warnings
1790 and then Current_Sem_Unit
= Main_Unit
1791 and then not Intunit
1792 and then not Implicit_With
(N
)
1793 and then not GNAT_Mode
1796 U_Kind
: constant Kind_Of_Unit
:=
1797 Get_Kind_Of_Unit
(Get_Source_Unit
(U
));
1800 if U_Kind
= Implementation_Unit
then
1801 Error_Msg_N
("& is an internal 'G'N'A'T unit?", Name
(N
));
1803 ("\use of this unit is non-portable " &
1804 "and version-dependent?",
1807 elsif U_Kind
= Ada_05_Unit
1808 and then Ada_Version
< Ada_05
1809 and then Warn_On_Ada_2005_Compatibility
1811 Error_Msg_N
("& is an Ada 2005 unit?", Name
(N
));
1817 -- Semantic analysis of a generic unit is performed on a copy of
1818 -- the original tree. Retrieve the entity on which semantic info
1819 -- actually appears.
1821 if Unit_Kind
in N_Generic_Declaration
then
1822 E_Name
:= Defining_Entity
(U
);
1824 -- Note: in the following test, Unit_Kind is the original Nkind, but
1825 -- in the case of an instantiation, semantic analysis above will
1826 -- have replaced the unit by its instantiated version. If the instance
1827 -- body has been generated, the instance now denotes the body entity.
1828 -- For visibility purposes we need the entity of its spec.
1830 elsif (Unit_Kind
= N_Package_Instantiation
1831 or else Nkind
(Original_Node
(Unit
(Library_Unit
(N
)))) =
1832 N_Package_Instantiation
)
1833 and then Nkind
(U
) = N_Package_Body
1835 E_Name
:= Corresponding_Spec
(U
);
1837 elsif Unit_Kind
= N_Package_Instantiation
1838 and then Nkind
(U
) = N_Package_Instantiation
1840 -- If the instance has not been rewritten as a package declaration,
1841 -- then it appeared already in a previous with clause. Retrieve
1842 -- the entity from the previous instance.
1844 E_Name
:= Defining_Entity
(Specification
(Instance_Spec
(U
)));
1846 elsif Unit_Kind
in N_Subprogram_Instantiation
then
1848 -- Instantiation node is replaced with a package that contains
1849 -- renaming declarations and instance itself. The subprogram
1850 -- Instance is declared in the visible part of the wrapper package.
1852 E_Name
:= First_Entity
(Defining_Entity
(U
));
1853 while Present
(E_Name
) loop
1854 exit when Is_Subprogram
(E_Name
)
1855 and then Is_Generic_Instance
(E_Name
);
1856 E_Name
:= Next_Entity
(E_Name
);
1859 elsif Unit_Kind
= N_Package_Renaming_Declaration
1860 or else Unit_Kind
in N_Generic_Renaming_Declaration
1862 E_Name
:= Defining_Entity
(U
);
1864 elsif Unit_Kind
= N_Subprogram_Body
1865 and then Nkind
(Name
(N
)) = N_Selected_Component
1866 and then not Acts_As_Spec
(Library_Unit
(N
))
1868 -- For a child unit that has no spec, one has been created and
1869 -- analyzed. The entity required is that of the spec.
1871 E_Name
:= Corresponding_Spec
(U
);
1874 E_Name
:= Defining_Entity
(U
);
1877 if Nkind
(Name
(N
)) = N_Selected_Component
then
1879 -- Child unit in a with clause
1881 Change_Selected_Component_To_Expanded_Name
(Name
(N
));
1884 -- Restore style checks and restrictions
1886 Style_Check
:= Save_Style_Check
;
1887 Cunit_Boolean_Restrictions_Restore
(Save_C_Restrict
);
1889 -- Record the reference, but do NOT set the unit as referenced, we want
1890 -- to consider the unit as unreferenced if this is the only reference
1893 Set_Entity_With_Style_Check
(Name
(N
), E_Name
);
1894 Generate_Reference
(E_Name
, Name
(N
), 'w', Set_Ref
=> False);
1896 if Is_Child_Unit
(E_Name
) then
1897 Pref
:= Prefix
(Name
(N
));
1898 Par_Name
:= Scope
(E_Name
);
1899 while Nkind
(Pref
) = N_Selected_Component
loop
1900 Change_Selected_Component_To_Expanded_Name
(Pref
);
1901 Set_Entity_With_Style_Check
(Pref
, Par_Name
);
1903 Generate_Reference
(Par_Name
, Pref
);
1904 Pref
:= Prefix
(Pref
);
1906 -- If E_Name is the dummy entity for a nonexistent unit, its scope
1907 -- is set to Standard_Standard, and no attempt should be made to
1908 -- further unwind scopes.
1910 if Par_Name
/= Standard_Standard
then
1911 Par_Name
:= Scope
(Par_Name
);
1915 if Present
(Entity
(Pref
))
1916 and then not Analyzed
(Parent
(Parent
(Entity
(Pref
))))
1918 -- If the entity is set without its unit being compiled, the
1919 -- original parent is a renaming, and Par_Name is the renamed
1920 -- entity. For visibility purposes, we need the original entity,
1921 -- which must be analyzed now because Load_Unit directly retrieves
1922 -- the renamed unit, and the renaming declaration itself has not
1925 Analyze
(Parent
(Parent
(Entity
(Pref
))));
1926 pragma Assert
(Renamed_Object
(Entity
(Pref
)) = Par_Name
);
1927 Par_Name
:= Entity
(Pref
);
1930 Set_Entity_With_Style_Check
(Pref
, Par_Name
);
1931 Generate_Reference
(Par_Name
, Pref
);
1934 -- If the withed unit is System, and a system extension pragma is
1935 -- present, compile the extension now, rather than waiting for a
1936 -- visibility check on a specific entity.
1938 if Chars
(E_Name
) = Name_System
1939 and then Scope
(E_Name
) = Standard_Standard
1940 and then Present
(System_Extend_Unit
)
1941 and then Present_System_Aux
(N
)
1943 -- If the extension is not present, an error will have been emitted
1948 -- Ada 2005 (AI-262): Remove from visibility the entity corresponding
1949 -- to private_with units; they will be made visible later (just before
1950 -- the private part is analyzed)
1952 if Private_Present
(N
) then
1953 Set_Is_Immediately_Visible
(E_Name
, False);
1956 -- Check for with'ing obsolescent package. Exclude subprograms here
1957 -- since we will catch those on the call rather than the WITH.
1959 if Is_Package_Or_Generic_Package
(E_Name
) then
1960 Check_Obsolescent
(E_Name
, N
);
1962 end Analyze_With_Clause
;
1964 ------------------------------
1965 -- Analyze_With_Type_Clause --
1966 ------------------------------
1968 procedure Analyze_With_Type_Clause
(N
: Node_Id
) is
1969 Loc
: constant Source_Ptr
:= Sloc
(N
);
1970 Nam
: constant Node_Id
:= Name
(N
);
1974 Unum
: Unit_Number_Type
;
1977 procedure Decorate_Tagged_Type
(T
: Entity_Id
);
1978 -- Set basic attributes of type, including its class_wide type
1980 function In_Chain
(E
: Entity_Id
) return Boolean;
1981 -- Check that the imported type is not already in the homonym chain,
1982 -- for example through a with_type clause in a parent unit.
1984 --------------------------
1985 -- Decorate_Tagged_Type --
1986 --------------------------
1988 procedure Decorate_Tagged_Type
(T
: Entity_Id
) is
1992 Set_Ekind
(T
, E_Record_Type
);
1993 Set_Is_Tagged_Type
(T
);
1995 Set_From_With_Type
(T
);
1998 if not In_Chain
(T
) then
1999 Set_Homonym
(T
, Current_Entity
(T
));
2000 Set_Current_Entity
(T
);
2003 -- Build bogus class_wide type, if not previously done
2005 if No
(Class_Wide_Type
(T
)) then
2006 CW
:= Make_Defining_Identifier
(Loc
, New_Internal_Name
('S'));
2008 Set_Ekind
(CW
, E_Class_Wide_Type
);
2011 Set_Is_Tagged_Type
(CW
);
2012 Set_Is_First_Subtype
(CW
, True);
2013 Init_Size_Align
(CW
);
2014 Set_Has_Unknown_Discriminants
2016 Set_Class_Wide_Type
(CW
, CW
);
2017 Set_Equivalent_Type
(CW
, Empty
);
2018 Set_From_With_Type
(CW
);
2020 Set_Class_Wide_Type
(T
, CW
);
2022 end Decorate_Tagged_Type
;
2028 function In_Chain
(E
: Entity_Id
) return Boolean is
2032 H
:= Current_Entity
(E
);
2033 while Present
(H
) loop
2044 -- Start of processing for Analyze_With_Type_Clause
2047 if Nkind
(Nam
) = N_Selected_Component
then
2048 Pack
:= New_Copy_Tree
(Prefix
(Nam
));
2049 Sel
:= Selector_Name
(Nam
);
2052 Error_Msg_N
("illegal name for imported type", Nam
);
2057 Make_Package_Declaration
(Loc
,
2059 (Make_Package_Specification
(Loc
,
2060 Defining_Unit_Name
=> Pack
,
2061 Visible_Declarations
=> New_List
,
2062 End_Label
=> Empty
)));
2066 (Load_Name
=> Get_Unit_Name
(Decl
),
2072 or else Nkind
(Unit
(Cunit
(Unum
))) /= N_Package_Declaration
2074 Error_Msg_N
("imported type must be declared in package", Nam
);
2077 elsif Unum
= Current_Sem_Unit
then
2079 -- If type is defined in unit being analyzed, then the clause
2085 P
:= Cunit_Entity
(Unum
);
2088 -- Find declaration for imported type, and set its basic attributes
2089 -- if it has not been analyzed (which will be the case if there is
2090 -- circular dependence).
2097 if not Analyzed
(Cunit
(Unum
))
2098 and then not From_With_Type
(P
)
2100 Set_Ekind
(P
, E_Package
);
2101 Set_Etype
(P
, Standard_Void_Type
);
2102 Set_From_With_Type
(P
);
2103 Set_Scope
(P
, Standard_Standard
);
2104 Set_Homonym
(P
, Current_Entity
(P
));
2105 Set_Current_Entity
(P
);
2107 elsif Analyzed
(Cunit
(Unum
))
2108 and then Is_Child_Unit
(P
)
2110 -- If the child unit is already in scope, indicate that it is
2111 -- visible, and remains so after intervening calls to rtsfind.
2113 Set_Is_Visible_Child_Unit
(P
);
2116 if Nkind
(Parent
(P
)) = N_Defining_Program_Unit_Name
then
2118 -- Make parent packages visible
2121 Parent_Comp
: Node_Id
;
2122 Parent_Id
: Entity_Id
;
2127 Parent_Comp
:= Parent_Spec
(Unit
(Cunit
(Unum
)));
2130 Parent_Id
:= Defining_Entity
(Unit
(Parent_Comp
));
2131 Set_Scope
(Child
, Parent_Id
);
2133 -- The type may be imported from a child unit, in which
2134 -- case the current compilation appears in the name. Do
2135 -- not change its visibility here because it will conflict
2136 -- with the subsequent normal processing.
2138 if not Analyzed
(Unit_Declaration_Node
(Parent_Id
))
2139 and then Parent_Id
/= Cunit_Entity
(Current_Sem_Unit
)
2141 Set_Ekind
(Parent_Id
, E_Package
);
2142 Set_Etype
(Parent_Id
, Standard_Void_Type
);
2144 -- The same package may appear is several with_type
2147 if not From_With_Type
(Parent_Id
) then
2148 Set_Homonym
(Parent_Id
, Current_Entity
(Parent_Id
));
2149 Set_Current_Entity
(Parent_Id
);
2150 Set_From_With_Type
(Parent_Id
);
2154 Set_Is_Immediately_Visible
(Parent_Id
);
2157 Parent_Comp
:= Parent_Spec
(Unit
(Parent_Comp
));
2158 exit when No
(Parent_Comp
);
2161 Set_Scope
(Parent_Id
, Standard_Standard
);
2165 -- Even if analyzed, the package may not be currently visible. It
2166 -- must be while the with_type clause is active.
2168 Set_Is_Immediately_Visible
(P
);
2171 First
(Visible_Declarations
(Specification
(Unit
(Cunit
(Unum
)))));
2172 while Present
(Decl
) loop
2173 if Nkind
(Decl
) = N_Full_Type_Declaration
2174 and then Chars
(Defining_Identifier
(Decl
)) = Chars
(Sel
)
2176 Typ
:= Defining_Identifier
(Decl
);
2178 if Tagged_Present
(N
) then
2180 -- The declaration must indicate that this is a tagged
2181 -- type or a type extension.
2183 if (Nkind
(Type_Definition
(Decl
)) = N_Record_Definition
2184 and then Tagged_Present
(Type_Definition
(Decl
)))
2186 (Nkind
(Type_Definition
(Decl
))
2187 = N_Derived_Type_Definition
2189 (Record_Extension_Part
(Type_Definition
(Decl
))))
2193 Error_Msg_N
("imported type is not a tagged type", Nam
);
2197 if not Analyzed
(Decl
) then
2199 -- Unit is not currently visible. Add basic attributes
2200 -- to type and build its class-wide type.
2202 Init_Size_Align
(Typ
);
2203 Decorate_Tagged_Type
(Typ
);
2207 if Nkind
(Type_Definition
(Decl
))
2208 /= N_Access_To_Object_Definition
2211 ("imported type is not an access type", Nam
);
2213 elsif not Analyzed
(Decl
) then
2214 Set_Ekind
(Typ
, E_Access_Type
);
2215 Set_Etype
(Typ
, Typ
);
2217 Init_Size
(Typ
, System_Address_Size
);
2218 Init_Alignment
(Typ
);
2219 Set_Directly_Designated_Type
(Typ
, Standard_Integer
);
2220 Set_From_With_Type
(Typ
);
2222 if not In_Chain
(Typ
) then
2223 Set_Homonym
(Typ
, Current_Entity
(Typ
));
2224 Set_Current_Entity
(Typ
);
2229 Set_Entity
(Sel
, Typ
);
2232 elsif ((Nkind
(Decl
) = N_Private_Type_Declaration
2233 and then Tagged_Present
(Decl
))
2234 or else (Nkind
(Decl
) = N_Private_Extension_Declaration
))
2235 and then Chars
(Defining_Identifier
(Decl
)) = Chars
(Sel
)
2237 Typ
:= Defining_Identifier
(Decl
);
2239 if not Tagged_Present
(N
) then
2240 Error_Msg_N
("type must be declared tagged", N
);
2242 elsif not Analyzed
(Decl
) then
2243 Decorate_Tagged_Type
(Typ
);
2246 Set_Entity
(Sel
, Typ
);
2247 Set_From_With_Type
(Typ
);
2251 Decl
:= Next
(Decl
);
2254 Error_Msg_NE
("not a visible access or tagged type in&", Nam
, P
);
2256 end Analyze_With_Type_Clause
;
2258 -----------------------------
2259 -- Check_With_Type_Clauses --
2260 -----------------------------
2262 procedure Check_With_Type_Clauses
(N
: Node_Id
) is
2263 Lib_Unit
: constant Node_Id
:= Unit
(N
);
2265 procedure Check_Parent_Context
(U
: Node_Id
);
2266 -- Examine context items of parent unit to locate with_type clauses
2268 --------------------------
2269 -- Check_Parent_Context --
2270 --------------------------
2272 procedure Check_Parent_Context
(U
: Node_Id
) is
2276 Item
:= First
(Context_Items
(U
));
2277 while Present
(Item
) loop
2278 if Nkind
(Item
) = N_With_Type_Clause
2279 and then not Error_Posted
(Item
)
2281 From_With_Type
(Scope
(Entity
(Selector_Name
(Name
(Item
)))))
2283 Error_Msg_Sloc
:= Sloc
(Item
);
2284 Error_Msg_N
("missing With_Clause for With_Type_Clause#", N
);
2289 end Check_Parent_Context
;
2291 -- Start of processing for Check_With_Type_Clauses
2294 if Extensions_Allowed
2295 and then (Nkind
(Lib_Unit
) = N_Package_Body
2296 or else Nkind
(Lib_Unit
) = N_Subprogram_Body
)
2298 Check_Parent_Context
(Library_Unit
(N
));
2300 if Is_Child_Spec
(Unit
(Library_Unit
(N
))) then
2301 Check_Parent_Context
(Parent_Spec
(Unit
(Library_Unit
(N
))));
2304 end Check_With_Type_Clauses
;
2306 ------------------------------
2307 -- Check_Private_Child_Unit --
2308 ------------------------------
2310 procedure Check_Private_Child_Unit
(N
: Node_Id
) is
2311 Lib_Unit
: constant Node_Id
:= Unit
(N
);
2313 Curr_Unit
: Entity_Id
;
2314 Sub_Parent
: Node_Id
;
2315 Priv_Child
: Entity_Id
;
2316 Par_Lib
: Entity_Id
;
2319 function Is_Private_Library_Unit
(Unit
: Entity_Id
) return Boolean;
2320 -- Returns true if and only if the library unit is declared with
2321 -- an explicit designation of private.
2323 function Is_Private_Library_Unit
(Unit
: Entity_Id
) return Boolean is
2324 Comp_Unit
: constant Node_Id
:= Parent
(Unit_Declaration_Node
(Unit
));
2327 return Private_Present
(Comp_Unit
);
2328 end Is_Private_Library_Unit
;
2330 -- Start of processing for Check_Private_Child_Unit
2333 if Nkind
(Lib_Unit
) = N_Package_Body
2334 or else Nkind
(Lib_Unit
) = N_Subprogram_Body
2336 Curr_Unit
:= Defining_Entity
(Unit
(Library_Unit
(N
)));
2337 Par_Lib
:= Curr_Unit
;
2339 elsif Nkind
(Lib_Unit
) = N_Subunit
then
2341 -- The parent is itself a body. The parent entity is to be found
2342 -- in the corresponding spec.
2344 Sub_Parent
:= Library_Unit
(N
);
2345 Curr_Unit
:= Defining_Entity
(Unit
(Library_Unit
(Sub_Parent
)));
2347 -- If the parent itself is a subunit, Curr_Unit is the entity
2348 -- of the enclosing body, retrieve the spec entity which is
2349 -- the proper ancestor we need for the following tests.
2351 if Ekind
(Curr_Unit
) = E_Package_Body
then
2352 Curr_Unit
:= Spec_Entity
(Curr_Unit
);
2355 Par_Lib
:= Curr_Unit
;
2358 Curr_Unit
:= Defining_Entity
(Lib_Unit
);
2360 Par_Lib
:= Curr_Unit
;
2361 Par_Spec
:= Parent_Spec
(Lib_Unit
);
2363 if No
(Par_Spec
) then
2366 Par_Lib
:= Defining_Entity
(Unit
(Par_Spec
));
2370 -- Loop through context items
2372 Item
:= First
(Context_Items
(N
));
2373 while Present
(Item
) loop
2375 -- Ada 2005 (AI-262): Allow private_with of a private child package
2376 -- in public siblings
2378 if Nkind
(Item
) = N_With_Clause
2379 and then not Implicit_With
(Item
)
2380 and then not Private_Present
(Item
)
2381 and then Is_Private_Descendant
(Entity
(Name
(Item
)))
2383 Priv_Child
:= Entity
(Name
(Item
));
2386 Curr_Parent
: Entity_Id
:= Par_Lib
;
2387 Child_Parent
: Entity_Id
:= Scope
(Priv_Child
);
2388 Prv_Ancestor
: Entity_Id
:= Child_Parent
;
2389 Curr_Private
: Boolean := Is_Private_Library_Unit
(Curr_Unit
);
2392 -- If the child unit is a public child then locate
2393 -- the nearest private ancestor; Child_Parent will
2394 -- then be set to the parent of that ancestor.
2396 if not Is_Private_Library_Unit
(Priv_Child
) then
2397 while Present
(Prv_Ancestor
)
2398 and then not Is_Private_Library_Unit
(Prv_Ancestor
)
2400 Prv_Ancestor
:= Scope
(Prv_Ancestor
);
2403 if Present
(Prv_Ancestor
) then
2404 Child_Parent
:= Scope
(Prv_Ancestor
);
2408 while Present
(Curr_Parent
)
2409 and then Curr_Parent
/= Standard_Standard
2410 and then Curr_Parent
/= Child_Parent
2413 Curr_Private
or else Is_Private_Library_Unit
(Curr_Parent
);
2414 Curr_Parent
:= Scope
(Curr_Parent
);
2417 if not Present
(Curr_Parent
) then
2418 Curr_Parent
:= Standard_Standard
;
2421 if Curr_Parent
/= Child_Parent
then
2423 if Ekind
(Priv_Child
) = E_Generic_Package
2424 and then Chars
(Priv_Child
) in Text_IO_Package_Name
2425 and then Chars
(Scope
(Scope
(Priv_Child
))) = Name_Ada
2428 ("& is a nested package, not a compilation unit",
2429 Name
(Item
), Priv_Child
);
2433 ("unit in with clause is private child unit!", Item
);
2435 ("current unit must also have parent&!",
2436 Item
, Child_Parent
);
2439 elsif not Curr_Private
2440 and then Nkind
(Lib_Unit
) /= N_Package_Body
2441 and then Nkind
(Lib_Unit
) /= N_Subprogram_Body
2442 and then Nkind
(Lib_Unit
) /= N_Subunit
2445 ("current unit must also be private descendant of&",
2446 Item
, Child_Parent
);
2454 end Check_Private_Child_Unit
;
2456 ----------------------
2457 -- Check_Stub_Level --
2458 ----------------------
2460 procedure Check_Stub_Level
(N
: Node_Id
) is
2461 Par
: constant Node_Id
:= Parent
(N
);
2462 Kind
: constant Node_Kind
:= Nkind
(Par
);
2465 if (Kind
= N_Package_Body
2466 or else Kind
= N_Subprogram_Body
2467 or else Kind
= N_Task_Body
2468 or else Kind
= N_Protected_Body
)
2469 and then (Nkind
(Parent
(Par
)) = N_Compilation_Unit
2470 or else Nkind
(Parent
(Par
)) = N_Subunit
)
2474 -- In an instance, a missing stub appears at any level. A warning
2475 -- message will have been emitted already for the missing file.
2477 elsif not In_Instance
then
2478 Error_Msg_N
("stub cannot appear in an inner scope", N
);
2480 elsif Expander_Active
then
2481 Error_Msg_N
("missing proper body", N
);
2483 end Check_Stub_Level
;
2485 ------------------------
2486 -- Expand_With_Clause --
2487 ------------------------
2489 procedure Expand_With_Clause
(Item
: Node_Id
; Nam
: Node_Id
; N
: Node_Id
) is
2490 Loc
: constant Source_Ptr
:= Sloc
(Nam
);
2491 Ent
: constant Entity_Id
:= Entity
(Nam
);
2495 function Build_Unit_Name
(Nam
: Node_Id
) return Node_Id
;
2496 -- Comment requireed here ???
2498 ---------------------
2499 -- Build_Unit_Name --
2500 ---------------------
2502 function Build_Unit_Name
(Nam
: Node_Id
) return Node_Id
is
2506 if Nkind
(Nam
) = N_Identifier
then
2507 return New_Occurrence_Of
(Entity
(Nam
), Loc
);
2511 Make_Expanded_Name
(Loc
,
2512 Chars
=> Chars
(Entity
(Nam
)),
2513 Prefix
=> Build_Unit_Name
(Prefix
(Nam
)),
2514 Selector_Name
=> New_Occurrence_Of
(Entity
(Nam
), Loc
));
2515 Set_Entity
(Result
, Entity
(Nam
));
2518 end Build_Unit_Name
;
2520 -- Start of processing for Expand_With_Clause
2523 New_Nodes_OK
:= New_Nodes_OK
+ 1;
2525 Make_With_Clause
(Loc
, Name
=> Build_Unit_Name
(Nam
));
2527 P
:= Parent
(Unit_Declaration_Node
(Ent
));
2528 Set_Library_Unit
(Withn
, P
);
2529 Set_Corresponding_Spec
(Withn
, Ent
);
2530 Set_First_Name
(Withn
, True);
2531 Set_Implicit_With
(Withn
, True);
2533 -- If the unit is a package declaration, a private_with_clause on a
2534 -- child unit implies that the implicit with on the parent is also
2537 if Nkind
(Unit
(N
)) = N_Package_Declaration
then
2538 Set_Private_Present
(Withn
, Private_Present
(Item
));
2541 Prepend
(Withn
, Context_Items
(N
));
2542 Mark_Rewrite_Insertion
(Withn
);
2543 Install_Withed_Unit
(Withn
);
2545 if Nkind
(Nam
) = N_Expanded_Name
then
2546 Expand_With_Clause
(Item
, Prefix
(Nam
), N
);
2549 New_Nodes_OK
:= New_Nodes_OK
- 1;
2550 end Expand_With_Clause
;
2552 -----------------------
2553 -- Get_Parent_Entity --
2554 -----------------------
2556 function Get_Parent_Entity
(Unit
: Node_Id
) return Entity_Id
is
2558 if Nkind
(Unit
) = N_Package_Body
2559 and then Nkind
(Original_Node
(Unit
)) = N_Package_Instantiation
2563 (Specification
(Instance_Spec
(Original_Node
(Unit
))));
2565 elsif Nkind
(Unit
) = N_Package_Instantiation
then
2566 return Defining_Entity
(Specification
(Instance_Spec
(Unit
)));
2569 return Defining_Entity
(Unit
);
2571 end Get_Parent_Entity
;
2573 -----------------------------
2574 -- Implicit_With_On_Parent --
2575 -----------------------------
2577 procedure Implicit_With_On_Parent
2578 (Child_Unit
: Node_Id
;
2581 Loc
: constant Source_Ptr
:= Sloc
(N
);
2582 P
: constant Node_Id
:= Parent_Spec
(Child_Unit
);
2584 P_Unit
: Node_Id
:= Unit
(P
);
2586 P_Name
: constant Entity_Id
:= Get_Parent_Entity
(P_Unit
);
2589 function Build_Ancestor_Name
(P
: Node_Id
) return Node_Id
;
2590 -- Build prefix of child unit name. Recurse if needed
2592 function Build_Unit_Name
return Node_Id
;
2593 -- If the unit is a child unit, build qualified name with all
2596 -------------------------
2597 -- Build_Ancestor_Name --
2598 -------------------------
2600 function Build_Ancestor_Name
(P
: Node_Id
) return Node_Id
is
2601 P_Ref
: constant Node_Id
:=
2602 New_Reference_To
(Defining_Entity
(P
), Loc
);
2603 P_Spec
: Node_Id
:= P
;
2606 -- Ancestor may have been rewritten as a package body. Retrieve
2607 -- the original spec to trace earlier ancestors.
2609 if Nkind
(P
) = N_Package_Body
2610 and then Nkind
(Original_Node
(P
)) = N_Package_Instantiation
2612 P_Spec
:= Original_Node
(P
);
2615 if No
(Parent_Spec
(P_Spec
)) then
2619 Make_Selected_Component
(Loc
,
2620 Prefix
=> Build_Ancestor_Name
(Unit
(Parent_Spec
(P_Spec
))),
2621 Selector_Name
=> P_Ref
);
2623 end Build_Ancestor_Name
;
2625 ---------------------
2626 -- Build_Unit_Name --
2627 ---------------------
2629 function Build_Unit_Name
return Node_Id
is
2632 if No
(Parent_Spec
(P_Unit
)) then
2633 return New_Reference_To
(P_Name
, Loc
);
2636 Make_Expanded_Name
(Loc
,
2637 Chars
=> Chars
(P_Name
),
2638 Prefix
=> Build_Ancestor_Name
(Unit
(Parent_Spec
(P_Unit
))),
2639 Selector_Name
=> New_Reference_To
(P_Name
, Loc
));
2640 Set_Entity
(Result
, P_Name
);
2643 end Build_Unit_Name
;
2645 -- Start of processing for Implicit_With_On_Parent
2648 -- The unit of the current compilation may be a package body
2649 -- that replaces an instance node. In this case we need the
2650 -- original instance node to construct the proper parent name.
2652 if Nkind
(P_Unit
) = N_Package_Body
2653 and then Nkind
(Original_Node
(P_Unit
)) = N_Package_Instantiation
2655 P_Unit
:= Original_Node
(P_Unit
);
2658 -- We add the implicit with if the child unit is the current unit
2659 -- being compiled. If the current unit is a body, we do not want
2660 -- to add an implicit_with a second time to the corresponding spec.
2662 if Nkind
(Child_Unit
) = N_Package_Declaration
2663 and then Child_Unit
/= Unit
(Cunit
(Current_Sem_Unit
))
2668 New_Nodes_OK
:= New_Nodes_OK
+ 1;
2669 Withn
:= Make_With_Clause
(Loc
, Name
=> Build_Unit_Name
);
2671 Set_Library_Unit
(Withn
, P
);
2672 Set_Corresponding_Spec
(Withn
, P_Name
);
2673 Set_First_Name
(Withn
, True);
2674 Set_Implicit_With
(Withn
, True);
2676 -- Node is placed at the beginning of the context items, so that
2677 -- subsequent use clauses on the parent can be validated.
2679 Prepend
(Withn
, Context_Items
(N
));
2680 Mark_Rewrite_Insertion
(Withn
);
2681 Install_Withed_Unit
(Withn
);
2683 if Is_Child_Spec
(P_Unit
) then
2684 Implicit_With_On_Parent
(P_Unit
, N
);
2687 New_Nodes_OK
:= New_Nodes_OK
- 1;
2688 end Implicit_With_On_Parent
;
2694 function In_Chain
(E
: Entity_Id
) return Boolean is
2698 H
:= Current_Entity
(E
);
2699 while Present
(H
) loop
2710 ---------------------
2711 -- Install_Context --
2712 ---------------------
2714 procedure Install_Context
(N
: Node_Id
) is
2715 Lib_Unit
: constant Node_Id
:= Unit
(N
);
2718 Install_Context_Clauses
(N
);
2720 if Is_Child_Spec
(Lib_Unit
) then
2721 Install_Parents
(Lib_Unit
, Private_Present
(Parent
(Lib_Unit
)));
2724 Install_Limited_Context_Clauses
(N
);
2726 Check_With_Type_Clauses
(N
);
2727 end Install_Context
;
2729 -----------------------------
2730 -- Install_Context_Clauses --
2731 -----------------------------
2733 procedure Install_Context_Clauses
(N
: Node_Id
) is
2734 Lib_Unit
: constant Node_Id
:= Unit
(N
);
2736 Uname_Node
: Entity_Id
;
2737 Check_Private
: Boolean := False;
2738 Decl_Node
: Node_Id
;
2739 Lib_Parent
: Entity_Id
;
2742 -- Loop through context clauses to find the with/use clauses.
2743 -- This is done twice, first for everything except limited_with
2744 -- clauses, and then for those, if any are present.
2746 Item
:= First
(Context_Items
(N
));
2747 while Present
(Item
) loop
2749 -- Case of explicit WITH clause
2751 if Nkind
(Item
) = N_With_Clause
2752 and then not Implicit_With
(Item
)
2754 if Limited_Present
(Item
) then
2756 -- Limited withed units will be installed later
2760 -- If Name (Item) is not an entity name, something is wrong, and
2761 -- this will be detected in due course, for now ignore the item
2763 elsif not Is_Entity_Name
(Name
(Item
)) then
2766 elsif No
(Entity
(Name
(Item
))) then
2767 Set_Entity
(Name
(Item
), Any_Id
);
2771 Uname_Node
:= Entity
(Name
(Item
));
2773 if Is_Private_Descendant
(Uname_Node
) then
2774 Check_Private
:= True;
2777 Install_Withed_Unit
(Item
);
2779 Decl_Node
:= Unit_Declaration_Node
(Uname_Node
);
2781 -- If the unit is a subprogram instance, it appears nested
2782 -- within a package that carries the parent information.
2784 if Is_Generic_Instance
(Uname_Node
)
2785 and then Ekind
(Uname_Node
) /= E_Package
2787 Decl_Node
:= Parent
(Parent
(Decl_Node
));
2790 if Is_Child_Spec
(Decl_Node
) then
2791 if Nkind
(Name
(Item
)) = N_Expanded_Name
then
2792 Expand_With_Clause
(Item
, Prefix
(Name
(Item
)), N
);
2794 -- if not an expanded name, the child unit must be a
2795 -- renaming, nothing to do.
2800 elsif Nkind
(Decl_Node
) = N_Subprogram_Body
2801 and then not Acts_As_Spec
(Parent
(Decl_Node
))
2802 and then Is_Child_Spec
(Unit
(Library_Unit
(Parent
(Decl_Node
))))
2804 Implicit_With_On_Parent
2805 (Unit
(Library_Unit
(Parent
(Decl_Node
))), N
);
2808 -- Check license conditions unless this is a dummy unit
2810 if Sloc
(Library_Unit
(Item
)) /= No_Location
then
2811 License_Check
: declare
2813 Withu
: constant Unit_Number_Type
:=
2814 Get_Source_Unit
(Library_Unit
(Item
));
2816 Withl
: constant License_Type
:=
2817 License
(Source_Index
(Withu
));
2819 Unitl
: constant License_Type
:=
2820 License
(Source_Index
(Current_Sem_Unit
));
2822 procedure License_Error
;
2823 -- Signal error of bad license
2829 procedure License_Error
is
2832 ("?license of with'ed unit & may be inconsistent",
2836 -- Start of processing for License_Check
2839 -- Exclude license check if withed unit is an internal unit.
2840 -- This situation arises e.g. with the GPL version of GNAT.
2842 if Is_Internal_File_Name
(Unit_File_Name
(Withu
)) then
2845 -- Otherwise check various cases
2857 if Withl
= Restricted
then
2861 when Modified_GPL
=>
2862 if Withl
= Restricted
or else Withl
= GPL
then
2866 when Unrestricted
=>
2873 -- Case of USE PACKAGE clause
2875 elsif Nkind
(Item
) = N_Use_Package_Clause
then
2876 Analyze_Use_Package
(Item
);
2878 -- Case of USE TYPE clause
2880 elsif Nkind
(Item
) = N_Use_Type_Clause
then
2881 Analyze_Use_Type
(Item
);
2883 -- Case of WITH TYPE clause
2885 -- A With_Type_Clause is processed when installing the context,
2886 -- because it is a visibility mechanism and does not create a
2887 -- semantic dependence on other units, as a With_Clause does.
2889 elsif Nkind
(Item
) = N_With_Type_Clause
then
2890 Analyze_With_Type_Clause
(Item
);
2894 elsif Nkind
(Item
) = N_Pragma
then
2902 if Is_Child_Spec
(Lib_Unit
) then
2904 -- The unit also has implicit withs on its own parents
2906 if No
(Context_Items
(N
)) then
2907 Set_Context_Items
(N
, New_List
);
2910 Implicit_With_On_Parent
(Lib_Unit
, N
);
2913 -- If the unit is a body, the context of the specification must also
2916 if Nkind
(Lib_Unit
) = N_Package_Body
2917 or else (Nkind
(Lib_Unit
) = N_Subprogram_Body
2918 and then not Acts_As_Spec
(N
))
2920 Install_Context
(Library_Unit
(N
));
2922 if Is_Child_Spec
(Unit
(Library_Unit
(N
))) then
2924 -- If the unit is the body of a public child unit, the private
2925 -- declarations of the parent must be made visible. If the child
2926 -- unit is private, the private declarations have been installed
2927 -- already in the call to Install_Parents for the spec. Installing
2928 -- private declarations must be done for all ancestors of public
2929 -- child units. In addition, sibling units mentioned in the
2930 -- context clause of the body are directly visible.
2938 Lib_Spec
:= Unit
(Library_Unit
(N
));
2939 while Is_Child_Spec
(Lib_Spec
) loop
2940 P
:= Unit
(Parent_Spec
(Lib_Spec
));
2941 P_Name
:= Defining_Entity
(P
);
2943 if not (Private_Present
(Parent
(Lib_Spec
)))
2944 and then not In_Private_Part
(P_Name
)
2946 Install_Private_Declarations
(P_Name
);
2947 Install_Private_With_Clauses
(P_Name
);
2948 Set_Use
(Private_Declarations
(Specification
(P
)));
2956 -- For a package body, children in context are immediately visible
2958 Install_Siblings
(Defining_Entity
(Unit
(Library_Unit
(N
))), N
);
2961 if Nkind
(Lib_Unit
) = N_Generic_Package_Declaration
2962 or else Nkind
(Lib_Unit
) = N_Generic_Subprogram_Declaration
2963 or else Nkind
(Lib_Unit
) = N_Package_Declaration
2964 or else Nkind
(Lib_Unit
) = N_Subprogram_Declaration
2966 if Is_Child_Spec
(Lib_Unit
) then
2967 Lib_Parent
:= Defining_Entity
(Unit
(Parent_Spec
(Lib_Unit
)));
2968 Set_Is_Private_Descendant
2969 (Defining_Entity
(Lib_Unit
),
2970 Is_Private_Descendant
(Lib_Parent
)
2971 or else Private_Present
(Parent
(Lib_Unit
)));
2974 Set_Is_Private_Descendant
2975 (Defining_Entity
(Lib_Unit
),
2976 Private_Present
(Parent
(Lib_Unit
)));
2980 if Check_Private
then
2981 Check_Private_Child_Unit
(N
);
2983 end Install_Context_Clauses
;
2985 -------------------------------------
2986 -- Install_Limited_Context_Clauses --
2987 -------------------------------------
2989 procedure Install_Limited_Context_Clauses
(N
: Node_Id
) is
2992 procedure Check_Renamings
(P
: Node_Id
; W
: Node_Id
);
2993 -- Check that the unlimited view of a given compilation_unit is not
2994 -- already visible through "use + renamings".
2996 procedure Check_Private_Limited_Withed_Unit
(N
: Node_Id
);
2997 -- Check that if a limited_with clause of a given compilation_unit
2998 -- mentions a private child of some library unit, then the given
2999 -- compilation_unit shall be the declaration of a private descendant
3000 -- of that library unit.
3002 procedure Expand_Limited_With_Clause
3003 (Comp_Unit
: Node_Id
; Nam
: Node_Id
; N
: Node_Id
);
3004 -- If a child unit appears in a limited_with clause, there are implicit
3005 -- limited_with clauses on all parents that are not already visible
3006 -- through a regular with clause. This procedure creates the implicit
3007 -- limited with_clauses for the parents and loads the corresponding
3008 -- units. The shadow entities are created when the inserted clause is
3009 -- analyzed. Implements Ada 2005 (AI-50217).
3011 ---------------------
3012 -- Check_Renamings --
3013 ---------------------
3015 procedure Check_Renamings
(P
: Node_Id
; W
: Node_Id
) is
3024 pragma Assert
(Nkind
(W
) = N_With_Clause
);
3026 -- Protect the frontend against previous critical errors
3028 case Nkind
(Unit
(Library_Unit
(W
))) is
3029 when N_Subprogram_Declaration |
3030 N_Package_Declaration |
3031 N_Generic_Subprogram_Declaration |
3032 N_Generic_Package_Declaration
=>
3039 -- Check "use + renamings"
3041 WEnt
:= Defining_Unit_Name
(Specification
(Unit
(Library_Unit
(W
))));
3042 Spec
:= Specification
(Unit
(P
));
3044 Item
:= First
(Visible_Declarations
(Spec
));
3045 while Present
(Item
) loop
3047 if Nkind
(Item
) = N_Use_Package_Clause
then
3049 -- Traverse the list of packages
3051 Nam
:= First
(Names
(Item
));
3052 while Present
(Nam
) loop
3055 pragma Assert
(Present
(Parent
(E
)));
3057 if Nkind
(Parent
(E
)) = N_Package_Renaming_Declaration
3058 and then Renamed_Entity
(E
) = WEnt
3060 Error_Msg_N
("unlimited view visible through " &
3061 "use clause and renamings", W
);
3064 elsif Nkind
(Parent
(E
)) = N_Package_Specification
then
3066 -- The use clause may refer to a local package.
3067 -- Check all the enclosing scopes.
3070 while E2
/= Standard_Standard
3071 and then E2
/= WEnt
loop
3077 ("unlimited view visible through use clause ", W
);
3090 -- Recursive call to check all the ancestors
3092 if Is_Child_Spec
(Unit
(P
)) then
3093 Check_Renamings
(P
=> Parent_Spec
(Unit
(P
)), W
=> W
);
3095 end Check_Renamings
;
3097 ---------------------------------------
3098 -- Check_Private_Limited_Withed_Unit --
3099 ---------------------------------------
3101 procedure Check_Private_Limited_Withed_Unit
(N
: Node_Id
) is
3104 Found
: Boolean := False;
3107 -- If the current compilation unit is not private we don't
3108 -- need to check anything else.
3110 if not Private_Present
(Parent
(N
)) then
3114 -- Compilation unit of the parent of the withed library unit
3116 P
:= Parent_Spec
(Unit
(Library_Unit
(N
)));
3118 -- Traverse all the ancestors of the current compilation
3119 -- unit to check if it is a descendant of named library unit.
3122 while Present
(Parent_Spec
(Unit
(C
))) loop
3123 C
:= Parent_Spec
(Unit
(C
));
3133 Error_Msg_N
("current unit is not a private descendant"
3134 & " of the withed unit ('R'M 10.1.2(8)", N
);
3136 end Check_Private_Limited_Withed_Unit
;
3138 --------------------------------
3139 -- Expand_Limited_With_Clause --
3140 --------------------------------
3142 procedure Expand_Limited_With_Clause
3143 (Comp_Unit
: Node_Id
;
3147 Loc
: constant Source_Ptr
:= Sloc
(Nam
);
3148 Unum
: Unit_Number_Type
;
3151 function Previous_Withed_Unit
(W
: Node_Id
) return Boolean;
3152 -- Returns true if the context already includes a with_clause for
3153 -- this unit. If the with_clause is non-limited, the unit is fully
3154 -- visible and an implicit limited_with should not be created. If
3155 -- there is already a limited_with clause for W, a second one is
3156 -- simply redundant.
3158 --------------------------
3159 -- Previous_Withed_Unit --
3160 --------------------------
3162 function Previous_Withed_Unit
(W
: Node_Id
) return Boolean is
3166 -- A limited with_clause cannot appear in the same context_clause
3167 -- as a nonlimited with_clause which mentions the same library.
3169 Item
:= First
(Context_Items
(Comp_Unit
));
3170 while Present
(Item
) loop
3171 if Nkind
(Item
) = N_With_Clause
3172 and then Library_Unit
(Item
) = Library_Unit
(W
)
3181 end Previous_Withed_Unit
;
3183 -- Start of processing for Expand_Limited_With_Clause
3186 New_Nodes_OK
:= New_Nodes_OK
+ 1;
3188 if Nkind
(Nam
) = N_Identifier
then
3190 Make_With_Clause
(Loc
,
3193 else pragma Assert
(Nkind
(Nam
) = N_Selected_Component
);
3195 Make_With_Clause
(Loc
,
3196 Name
=> Make_Selected_Component
(Loc
,
3197 Prefix
=> Prefix
(Nam
),
3198 Selector_Name
=> Selector_Name
(Nam
)));
3199 Set_Parent
(Withn
, Parent
(N
));
3202 Set_Limited_Present
(Withn
);
3203 Set_First_Name
(Withn
);
3204 Set_Implicit_With
(Withn
);
3208 (Load_Name
=> Get_Spec_Name
(Get_Unit_Name
(Nam
)),
3213 -- Do not generate a limited_with_clause on the current unit.
3214 -- This path is taken when a unit has a limited_with clause on
3215 -- one of its child units.
3217 if Unum
= Current_Sem_Unit
then
3221 Set_Library_Unit
(Withn
, Cunit
(Unum
));
3222 Set_Corresponding_Spec
3223 (Withn
, Specification
(Unit
(Cunit
(Unum
))));
3225 if not Previous_Withed_Unit
(Withn
) then
3226 Prepend
(Withn
, Context_Items
(Parent
(N
)));
3227 Mark_Rewrite_Insertion
(Withn
);
3229 -- Add implicit limited_with_clauses for parents of child units
3230 -- mentioned in limited_with clauses.
3232 if Nkind
(Nam
) = N_Selected_Component
then
3233 Expand_Limited_With_Clause
(Comp_Unit
, Prefix
(Nam
), N
);
3238 if not Limited_View_Installed
(Withn
) then
3239 Install_Limited_Withed_Unit
(Withn
);
3243 New_Nodes_OK
:= New_Nodes_OK
- 1;
3244 end Expand_Limited_With_Clause
;
3246 -- Start of processing for Install_Limited_Context_Clauses
3249 Item
:= First
(Context_Items
(N
));
3250 while Present
(Item
) loop
3251 if Nkind
(Item
) = N_With_Clause
3252 and then Limited_Present
(Item
)
3254 if Nkind
(Name
(Item
)) = N_Selected_Component
then
3255 Expand_Limited_With_Clause
3256 (Comp_Unit
=> N
, Nam
=> Prefix
(Name
(Item
)), N
=> Item
);
3259 if Private_Present
(Library_Unit
(Item
)) then
3260 Check_Private_Limited_Withed_Unit
(Item
);
3263 if not Implicit_With
(Item
)
3264 and then Is_Child_Spec
(Unit
(N
))
3266 Check_Renamings
(Parent_Spec
(Unit
(N
)), Item
);
3269 -- A unit may have a limited with on itself if it has a
3270 -- limited with_clause on one of its child units. In that
3271 -- case it is already being compiled and it makes no sense
3272 -- to install its limited view.
3274 if Library_Unit
(Item
) /= Cunit
(Current_Sem_Unit
)
3275 and then not Limited_View_Installed
(Item
)
3277 Install_Limited_Withed_Unit
(Item
);
3283 end Install_Limited_Context_Clauses
;
3285 ---------------------
3286 -- Install_Parents --
3287 ---------------------
3289 procedure Install_Parents
(Lib_Unit
: Node_Id
; Is_Private
: Boolean) is
3296 P
:= Unit
(Parent_Spec
(Lib_Unit
));
3297 P_Name
:= Get_Parent_Entity
(P
);
3299 if Etype
(P_Name
) = Any_Type
then
3303 if Ekind
(P_Name
) = E_Generic_Package
3304 and then Nkind
(Lib_Unit
) /= N_Generic_Subprogram_Declaration
3305 and then Nkind
(Lib_Unit
) /= N_Generic_Package_Declaration
3306 and then Nkind
(Lib_Unit
) not in N_Generic_Renaming_Declaration
3309 ("child of a generic package must be a generic unit", Lib_Unit
);
3311 elsif not Is_Package_Or_Generic_Package
(P_Name
) then
3313 ("parent unit must be package or generic package", Lib_Unit
);
3314 raise Unrecoverable_Error
;
3316 elsif Present
(Renamed_Object
(P_Name
)) then
3317 Error_Msg_N
("parent unit cannot be a renaming", Lib_Unit
);
3318 raise Unrecoverable_Error
;
3320 -- Verify that a child of an instance is itself an instance, or
3321 -- the renaming of one. Given that an instance that is a unit is
3322 -- replaced with a package declaration, check against the original
3323 -- node. The parent may be currently being instantiated, in which
3324 -- case it appears as a declaration, but the generic_parent is
3325 -- already established indicating that we deal with an instance.
3327 elsif Nkind
(Original_Node
(P
)) = N_Package_Instantiation
then
3329 if Nkind
(Lib_Unit
) in N_Renaming_Declaration
3330 or else Nkind
(Original_Node
(Lib_Unit
)) in N_Generic_Instantiation
3332 (Nkind
(Lib_Unit
) = N_Package_Declaration
3333 and then Present
(Generic_Parent
(Specification
(Lib_Unit
))))
3338 ("child of an instance must be an instance or renaming",
3343 -- This is the recursive call that ensures all parents are loaded
3345 if Is_Child_Spec
(P
) then
3347 Is_Private
or else Private_Present
(Parent
(Lib_Unit
)));
3350 -- Now we can install the context for this parent
3352 Install_Context_Clauses
(Parent_Spec
(Lib_Unit
));
3353 Install_Siblings
(P_Name
, Parent
(Lib_Unit
));
3355 -- The child unit is in the declarative region of the parent. The
3356 -- parent must therefore appear in the scope stack and be visible,
3357 -- as when compiling the corresponding body. If the child unit is
3358 -- private or it is a package body, private declarations must be
3359 -- accessible as well. Use declarations in the parent must also
3360 -- be installed. Finally, other child units of the same parent that
3361 -- are in the context are immediately visible.
3363 -- Find entity for compilation unit, and set its private descendant
3364 -- status as needed.
3366 E_Name
:= Defining_Entity
(Lib_Unit
);
3368 Set_Is_Child_Unit
(E_Name
);
3370 Set_Is_Private_Descendant
(E_Name
,
3371 Is_Private_Descendant
(P_Name
)
3372 or else Private_Present
(Parent
(Lib_Unit
)));
3374 P_Spec
:= Specification
(Unit_Declaration_Node
(P_Name
));
3377 -- Save current visibility of unit
3379 Scope_Stack
.Table
(Scope_Stack
.Last
).Previous_Visibility
:=
3380 Is_Immediately_Visible
(P_Name
);
3381 Set_Is_Immediately_Visible
(P_Name
);
3382 Install_Visible_Declarations
(P_Name
);
3383 Set_Use
(Visible_Declarations
(P_Spec
));
3385 -- If the parent is a generic unit, its formal part may contain
3386 -- formal packages and use clauses for them.
3388 if Ekind
(P_Name
) = E_Generic_Package
then
3389 Set_Use
(Generic_Formal_Declarations
(Parent
(P_Spec
)));
3393 or else Private_Present
(Parent
(Lib_Unit
))
3395 Install_Private_Declarations
(P_Name
);
3396 Install_Private_With_Clauses
(P_Name
);
3397 Set_Use
(Private_Declarations
(P_Spec
));
3399 end Install_Parents
;
3401 ----------------------------------
3402 -- Install_Private_With_Clauses --
3403 ----------------------------------
3405 procedure Install_Private_With_Clauses
(P
: Entity_Id
) is
3406 Decl
: constant Node_Id
:= Unit_Declaration_Node
(P
);
3410 if Debug_Flag_I
then
3411 Write_Str
("install private with clauses of ");
3412 Write_Name
(Chars
(P
));
3416 if Nkind
(Parent
(Decl
)) = N_Compilation_Unit
then
3417 Item
:= First
(Context_Items
(Parent
(Decl
)));
3418 while Present
(Item
) loop
3419 if Nkind
(Item
) = N_With_Clause
3420 and then Private_Present
(Item
)
3422 if Limited_Present
(Item
) then
3423 if not Limited_View_Installed
(Item
) then
3424 Install_Limited_Withed_Unit
(Item
);
3427 Install_Withed_Unit
(Item
, Private_With_OK
=> True);
3434 end Install_Private_With_Clauses
;
3436 ----------------------
3437 -- Install_Siblings --
3438 ----------------------
3440 procedure Install_Siblings
(U_Name
: Entity_Id
; N
: Node_Id
) is
3445 -- Iterate over explicit with clauses, and check whether the
3446 -- scope of each entity is an ancestor of the current unit.
3448 Item
:= First
(Context_Items
(N
));
3449 while Present
(Item
) loop
3451 -- Do not install private_with_clauses if the unit is a package
3452 -- declaration, unless it is itself a private child unit.
3454 if Nkind
(Item
) = N_With_Clause
3455 and then not Implicit_With
(Item
)
3456 and then not Limited_Present
(Item
)
3458 (not Private_Present
(Item
)
3459 or else Nkind
(Unit
(N
)) /= N_Package_Declaration
3460 or else Private_Present
(N
))
3462 Id
:= Entity
(Name
(Item
));
3464 if Is_Child_Unit
(Id
)
3465 and then Is_Ancestor_Package
(Scope
(Id
), U_Name
)
3467 Set_Is_Immediately_Visible
(Id
);
3469 -- Check for the presence of another unit in the context,
3470 -- that may be inadvertently hidden by the child.
3472 Prev
:= Current_Entity
(Id
);
3475 and then Is_Immediately_Visible
(Prev
)
3476 and then not Is_Child_Unit
(Prev
)
3482 Clause
:= First
(Context_Items
(N
));
3483 while Present
(Clause
) loop
3484 if Nkind
(Clause
) = N_With_Clause
3485 and then Entity
(Name
(Clause
)) = Prev
3488 ("child unit& hides compilation unit " &
3489 "with the same name?",
3499 -- the With_Clause may be on a grand-child, which makes
3500 -- the child immediately visible.
3502 elsif Is_Child_Unit
(Scope
(Id
))
3503 and then Is_Ancestor_Package
(Scope
(Scope
(Id
)), U_Name
)
3505 Set_Is_Immediately_Visible
(Scope
(Id
));
3511 end Install_Siblings
;
3513 -------------------------------
3514 -- Install_Limited_With_Unit --
3515 -------------------------------
3517 procedure Install_Limited_Withed_Unit
(N
: Node_Id
) is
3518 P_Unit
: constant Entity_Id
:= Unit
(Library_Unit
(N
));
3520 Is_Child_Package
: Boolean := False;
3522 Lim_Header
: Entity_Id
;
3523 Lim_Typ
: Entity_Id
;
3525 function Is_Visible_Through_Renamings
(P
: Entity_Id
) return Boolean;
3526 -- Check if some package installed though normal with-clauses has a
3527 -- renaming declaration of package P. AARM 10.1.2(21/2).
3529 ----------------------------------
3530 -- Is_Visible_Through_Renamings --
3531 ----------------------------------
3533 function Is_Visible_Through_Renamings
(P
: Entity_Id
) return Boolean is
3534 Kind
: constant Node_Kind
:=
3535 Nkind
(Unit
(Cunit
(Current_Sem_Unit
)));
3541 -- Example of the error detected by this subprogram:
3549 -- package Ren_P renames P;
3555 -- limited with P; -- ERROR
3556 -- package R.C is ...
3558 Aux_Unit
:= Cunit
(Current_Sem_Unit
);
3560 Item
:= First
(Context_Items
(Aux_Unit
));
3561 while Present
(Item
) loop
3562 if Nkind
(Item
) = N_With_Clause
3563 and then not Limited_Present
(Item
)
3564 and then Nkind
(Unit
(Library_Unit
(Item
)))
3565 = N_Package_Declaration
3568 First
(Visible_Declarations
3569 (Specification
(Unit
(Library_Unit
(Item
)))));
3570 while Present
(Decl
) loop
3571 if Nkind
(Decl
) = N_Package_Renaming_Declaration
3572 and then Entity
(Name
(Decl
)) = P
3574 -- Generate the error message only if the current unit
3575 -- is a package declaration; in case of subprogram
3576 -- bodies and package bodies we just return true to
3577 -- indicate that the limited view must not be
3580 if Kind
= N_Package_Declaration
then
3581 Error_Msg_Sloc
:= Sloc
(Item
);
3583 ("unlimited view of & visible through the context"
3584 & " clause found #", N
, P
);
3586 Error_Msg_Sloc
:= Sloc
(Decl
);
3588 ("unlimited view of & visible through the"
3589 & " renaming found #", N
, P
);
3592 ("simultaneous visibility of the limited and"
3593 & " unlimited views not allowed", N
);
3606 if Present
(Library_Unit
(Aux_Unit
)) then
3607 Aux_Unit
:= Library_Unit
(Aux_Unit
);
3609 Aux_Unit
:= Parent_Spec
(Unit
(Aux_Unit
));
3612 exit when not Present
(Aux_Unit
);
3616 end Is_Visible_Through_Renamings
;
3618 -- Start of processing for Install_Limited_Withed_Unit
3621 pragma Assert
(not Limited_View_Installed
(N
));
3623 -- In case of limited with_clause on subprograms, generics, instances,
3624 -- or renamings, the corresponding error was previously posted and we
3625 -- have nothing to do here.
3627 if Nkind
(P_Unit
) /= N_Package_Declaration
then
3631 P
:= Defining_Unit_Name
(Specification
(P_Unit
));
3633 -- Handle child packages
3635 if Nkind
(P
) = N_Defining_Program_Unit_Name
then
3636 Is_Child_Package
:= True;
3637 P
:= Defining_Identifier
(P
);
3640 -- Do not install the limited-view if the full-view is already visible
3641 -- through renaming declarations.
3643 if Is_Visible_Through_Renamings
(P
) then
3647 -- A common use of the limited-with is to have a limited-with
3648 -- in the package spec, and a normal with in its package body.
3651 -- limited with X; -- [1]
3655 -- package body A is ...
3657 -- The compilation of A's body installs the context clauses found at [2]
3658 -- and then the context clauses of its specification (found at [1]). As
3659 -- a consequence, at [1] the specification of X has been analyzed and it
3660 -- is immediately visible. According to the semantics of limited-with
3661 -- context clauses we don't install the limited view because the full
3662 -- view of X supersedes its limited view.
3664 if Analyzed
(P_Unit
)
3665 and then (Is_Immediately_Visible
(P
)
3666 or else (Is_Child_Package
3667 and then Is_Visible_Child_Unit
(P
)))
3669 -- Ada 2005 (AI-262): Install the private declarations of P
3671 if Private_Present
(N
)
3672 and then not In_Private_Part
(P
)
3678 Id
:= First_Private_Entity
(P
);
3679 while Present
(Id
) loop
3680 if not Is_Internal
(Id
)
3681 and then not Is_Child_Unit
(Id
)
3683 if not In_Chain
(Id
) then
3684 Set_Homonym
(Id
, Current_Entity
(Id
));
3685 Set_Current_Entity
(Id
);
3688 Set_Is_Immediately_Visible
(Id
);
3694 Set_In_Private_Part
(P
);
3701 if Debug_Flag_I
then
3702 Write_Str
("install limited view of ");
3703 Write_Name
(Chars
(P
));
3707 -- If the unit has not been analyzed and the limited view has not been
3708 -- already installed then we install it.
3710 if not Analyzed
(P_Unit
) then
3711 if not In_Chain
(P
) then
3713 -- Minimum decoration
3715 Set_Ekind
(P
, E_Package
);
3716 Set_Etype
(P
, Standard_Void_Type
);
3717 Set_Scope
(P
, Standard_Standard
);
3719 if Is_Child_Package
then
3720 Set_Is_Child_Unit
(P
);
3721 Set_Is_Visible_Child_Unit
(P
);
3722 Set_Scope
(P
, Defining_Entity
(Unit
(Parent_Spec
(P_Unit
))));
3725 -- Place entity on visibility structure
3727 Set_Homonym
(P
, Current_Entity
(P
));
3728 Set_Current_Entity
(P
);
3730 if Debug_Flag_I
then
3731 Write_Str
(" (homonym) chain ");
3732 Write_Name
(Chars
(P
));
3736 -- Install the incomplete view. The first element of the limited
3737 -- view is a header (an E_Package entity) used to reference the
3738 -- first shadow entity in the private part of the package.
3740 Lim_Header
:= Limited_View
(P
);
3741 Lim_Typ
:= First_Entity
(Lim_Header
);
3743 while Present
(Lim_Typ
)
3744 and then Lim_Typ
/= First_Private_Entity
(Lim_Header
)
3746 Set_Homonym
(Lim_Typ
, Current_Entity
(Lim_Typ
));
3747 Set_Current_Entity
(Lim_Typ
);
3749 if Debug_Flag_I
then
3750 Write_Str
(" (homonym) chain ");
3751 Write_Name
(Chars
(Lim_Typ
));
3755 Next_Entity
(Lim_Typ
);
3759 -- If the unit appears in a previous regular with_clause, the regular
3760 -- entities of the public part of the withed package must be replaced
3761 -- by the shadow ones.
3763 -- This code must be kept synchronized with the code that replaces the
3764 -- the shadow entities by the real entities (see body of Remove_Limited
3765 -- With_Clause); otherwise the contents of the homonym chains are not
3769 -- Hide all the type entities of the public part of the package to
3770 -- avoid its usage. This is needed to cover all the subtype decla-
3771 -- rations because we do not remove them from the homonym chain.
3777 E
:= First_Entity
(P
);
3778 while Present
(E
) and then E
/= First_Private_Entity
(P
) loop
3780 Set_Was_Hidden
(E
, Is_Hidden
(E
));
3788 -- Replace the real entities by the shadow entities of the limited
3789 -- view. The first element of the limited view is a header that is
3790 -- used to reference the first shadow entity in the private part
3793 Lim_Header
:= Limited_View
(P
);
3795 Lim_Typ
:= First_Entity
(Lim_Header
);
3796 while Present
(Lim_Typ
)
3797 and then Lim_Typ
/= First_Private_Entity
(Lim_Header
)
3799 pragma Assert
(not In_Chain
(Lim_Typ
));
3801 -- Do not unchain child units
3803 if not Is_Child_Unit
(Lim_Typ
) then
3808 Set_Homonym
(Lim_Typ
, Homonym
(Non_Limited_View
(Lim_Typ
)));
3809 Prev
:= Current_Entity
(Lim_Typ
);
3811 if Prev
= Non_Limited_View
(Lim_Typ
) then
3812 Set_Current_Entity
(Lim_Typ
);
3814 while Present
(Prev
)
3815 and then Homonym
(Prev
) /= Non_Limited_View
(Lim_Typ
)
3817 Prev
:= Homonym
(Prev
);
3820 Set_Homonym
(Prev
, Lim_Typ
);
3824 if Debug_Flag_I
then
3825 Write_Str
(" (homonym) chain ");
3826 Write_Name
(Chars
(Lim_Typ
));
3831 Next_Entity
(Lim_Typ
);
3835 -- The package must be visible while the limited-with clause is active
3836 -- because references to the type P.T must resolve in the usual way.
3837 -- In addition, we remember that the limited-view has been installed to
3838 -- uninstall it at the point of context removal.
3840 Set_Is_Immediately_Visible
(P
);
3841 Set_Limited_View_Installed
(N
);
3842 Set_From_With_Type
(P
);
3843 end Install_Limited_Withed_Unit
;
3845 -------------------------
3846 -- Install_Withed_Unit --
3847 -------------------------
3849 procedure Install_Withed_Unit
3850 (With_Clause
: Node_Id
;
3851 Private_With_OK
: Boolean := False)
3853 Uname
: constant Entity_Id
:= Entity
(Name
(With_Clause
));
3854 P
: constant Entity_Id
:= Scope
(Uname
);
3857 -- Ada 2005 (AI-262): Do not install the private withed unit if we are
3858 -- compiling a package declaration and the Private_With_OK flag was not
3859 -- set by the caller. These declarations will be installed later (before
3860 -- analyzing the private part of the package).
3862 if Private_Present
(With_Clause
)
3863 and then Nkind
(Unit
(Parent
(With_Clause
))) = N_Package_Declaration
3864 and then not (Private_With_OK
)
3869 if Debug_Flag_I
then
3870 if Private_Present
(With_Clause
) then
3871 Write_Str
("install private withed unit ");
3873 Write_Str
("install withed unit ");
3876 Write_Name
(Chars
(Uname
));
3880 -- We do not apply the restrictions to an internal unit unless
3881 -- we are compiling the internal unit as a main unit. This check
3882 -- is also skipped for dummy units (for missing packages).
3884 if Sloc
(Uname
) /= No_Location
3885 and then (not Is_Internal_File_Name
(Unit_File_Name
(Current_Sem_Unit
))
3886 or else Current_Sem_Unit
= Main_Unit
)
3888 Check_Restricted_Unit
3889 (Unit_Name
(Get_Source_Unit
(Uname
)), With_Clause
);
3892 if P
/= Standard_Standard
then
3894 -- If the unit is not analyzed after analysis of the with clause and
3895 -- it is an instantiation then it awaits a body and is the main unit.
3896 -- Its appearance in the context of some other unit indicates a
3897 -- circular dependency (DEC suite perversity).
3899 if not Analyzed
(Uname
)
3900 and then Nkind
(Parent
(Uname
)) = N_Package_Instantiation
3903 ("instantiation depends on itself", Name
(With_Clause
));
3905 elsif not Is_Visible_Child_Unit
(Uname
) then
3906 Set_Is_Visible_Child_Unit
(Uname
);
3908 -- If the child unit appears in the context of its parent, it is
3909 -- immediately visible.
3911 if In_Open_Scopes
(Scope
(Uname
)) then
3912 Set_Is_Immediately_Visible
(Uname
);
3915 if Is_Generic_Instance
(Uname
)
3916 and then Ekind
(Uname
) in Subprogram_Kind
3918 -- Set flag as well on the visible entity that denotes the
3919 -- instance, which renames the current one.
3921 Set_Is_Visible_Child_Unit
3923 (Defining_Entity
(Unit
(Library_Unit
(With_Clause
)))));
3926 -- The parent unit may have been installed already, and may have
3927 -- appeared in a use clause.
3929 if In_Use
(Scope
(Uname
)) then
3930 Set_Is_Potentially_Use_Visible
(Uname
);
3933 Set_Context_Installed
(With_Clause
);
3936 elsif not Is_Immediately_Visible
(Uname
) then
3937 if not Private_Present
(With_Clause
)
3938 or else Private_With_OK
3940 Set_Is_Immediately_Visible
(Uname
);
3943 Set_Context_Installed
(With_Clause
);
3946 -- A with-clause overrides a with-type clause: there are no restric-
3947 -- tions on the use of package entities.
3949 if Ekind
(Uname
) = E_Package
then
3950 Set_From_With_Type
(Uname
, False);
3953 -- Ada 2005 (AI-377): it is illegal for a with_clause to name a child
3954 -- unit if there is a visible homograph for it declared in the same
3955 -- declarative region. This pathological case can only arise when an
3956 -- instance I1 of a generic unit G1 has an explicit child unit I1.G2,
3957 -- G1 has a generic child also named G2, and the context includes with_
3958 -- clauses for both I1.G2 and for G1.G2, making an implicit declaration
3959 -- of I1.G2 visible as well. If the child unit is named Standard, do
3960 -- not apply the check to the Standard package itself.
3962 if Is_Child_Unit
(Uname
)
3963 and then Is_Visible_Child_Unit
(Uname
)
3964 and then Ada_Version
>= Ada_05
3967 Decl1
: constant Node_Id
:= Unit_Declaration_Node
(P
);
3973 U2
:= Homonym
(Uname
);
3975 and U2
/= Standard_Standard
3978 Decl2
:= Unit_Declaration_Node
(P2
);
3980 if Is_Child_Unit
(U2
)
3981 and then Is_Visible_Child_Unit
(U2
)
3983 if Is_Generic_Instance
(P
)
3984 and then Nkind
(Decl1
) = N_Package_Declaration
3985 and then Generic_Parent
(Specification
(Decl1
)) = P2
3987 Error_Msg_N
("illegal with_clause", With_Clause
);
3989 ("\child unit has visible homograph" &
3990 " ('R'M 8.3(26), 10.1.1(19))",
3994 elsif Is_Generic_Instance
(P2
)
3995 and then Nkind
(Decl2
) = N_Package_Declaration
3996 and then Generic_Parent
(Specification
(Decl2
)) = P
3998 -- With_clause for child unit of instance appears before
3999 -- in the context. We want to place the error message on
4000 -- it, not on the generic child unit itself.
4003 Prev_Clause
: Node_Id
;
4006 Prev_Clause
:= First
(List_Containing
(With_Clause
));
4007 while Entity
(Name
(Prev_Clause
)) /= U2
loop
4011 pragma Assert
(Present
(Prev_Clause
));
4012 Error_Msg_N
("illegal with_clause", Prev_Clause
);
4014 ("\child unit has visible homograph" &
4015 " ('R'M 8.3(26), 10.1.1(19))",
4026 end Install_Withed_Unit
;
4032 function Is_Child_Spec
(Lib_Unit
: Node_Id
) return Boolean is
4033 K
: constant Node_Kind
:= Nkind
(Lib_Unit
);
4036 return (K
in N_Generic_Declaration
or else
4037 K
in N_Generic_Instantiation
or else
4038 K
in N_Generic_Renaming_Declaration
or else
4039 K
= N_Package_Declaration
or else
4040 K
= N_Package_Renaming_Declaration
or else
4041 K
= N_Subprogram_Declaration
or else
4042 K
= N_Subprogram_Renaming_Declaration
)
4043 and then Present
(Parent_Spec
(Lib_Unit
));
4046 -----------------------
4047 -- Load_Needed_Body --
4048 -----------------------
4050 -- N is a generic unit named in a with clause, or else it is
4051 -- a unit that contains a generic unit or an inlined function.
4052 -- In order to perform an instantiation, the body of the unit
4053 -- must be present. If the unit itself is generic, we assume
4054 -- that an instantiation follows, and load and analyze the body
4055 -- unconditionally. This forces analysis of the spec as well.
4057 -- If the unit is not generic, but contains a generic unit, it
4058 -- is loaded on demand, at the point of instantiation (see ch12).
4060 procedure Load_Needed_Body
(N
: Node_Id
; OK
: out Boolean) is
4061 Body_Name
: Unit_Name_Type
;
4062 Unum
: Unit_Number_Type
;
4064 Save_Style_Check
: constant Boolean := Opt
.Style_Check
;
4065 -- The loading and analysis is done with style checks off
4068 if not GNAT_Mode
then
4069 Style_Check
:= False;
4072 Body_Name
:= Get_Body_Name
(Get_Unit_Name
(Unit
(N
)));
4075 (Load_Name
=> Body_Name
,
4081 if Unum
= No_Unit
then
4085 Compiler_State
:= Analyzing
; -- reset after load
4087 if not Fatal_Error
(Unum
) or else Try_Semantics
then
4088 if Debug_Flag_L
then
4089 Write_Str
("*** Loaded generic body");
4093 Semantics
(Cunit
(Unum
));
4099 Style_Check
:= Save_Style_Check
;
4100 end Load_Needed_Body
;
4102 -------------------------
4103 -- Build_Limited_Views --
4104 -------------------------
4106 procedure Build_Limited_Views
(N
: Node_Id
) is
4107 Unum
: constant Unit_Number_Type
:= Get_Source_Unit
(Library_Unit
(N
));
4108 P
: constant Entity_Id
:= Cunit_Entity
(Unum
);
4110 Spec
: Node_Id
; -- To denote a package specification
4111 Lim_Typ
: Entity_Id
; -- To denote shadow entities
4112 Comp_Typ
: Entity_Id
; -- To denote real entities
4114 Lim_Header
: Entity_Id
; -- Package entity
4115 Last_Lim_E
: Entity_Id
:= Empty
; -- Last limited entity built
4116 Last_Pub_Lim_E
: Entity_Id
; -- To set the first private entity
4118 procedure Decorate_Incomplete_Type
4121 -- Add attributes of an incomplete type to a shadow entity. The same
4122 -- attributes are placed on the real entity, so that gigi receives
4123 -- a consistent view.
4125 procedure Decorate_Package_Specification
(P
: Entity_Id
);
4126 -- Add attributes of a package entity to the entity in a package
4129 procedure Decorate_Tagged_Type
4133 -- Set basic attributes of tagged type T, including its class_wide type.
4134 -- The parameters Loc, Scope are used to decorate the class_wide type.
4136 procedure Build_Chain
4138 First_Decl
: Node_Id
);
4139 -- Construct list of shadow entities and attach it to entity of
4140 -- package that is mentioned in a limited_with clause.
4142 function New_Internal_Shadow_Entity
4143 (Kind
: Entity_Kind
;
4144 Sloc_Value
: Source_Ptr
;
4145 Id_Char
: Character) return Entity_Id
;
4146 -- Build a new internal entity and append it to the list of shadow
4147 -- entities available through the limited-header
4149 ------------------------------
4150 -- Decorate_Incomplete_Type --
4151 ------------------------------
4153 procedure Decorate_Incomplete_Type
4158 Set_Ekind
(E
, E_Incomplete_Type
);
4159 Set_Scope
(E
, Scop
);
4161 Set_Is_First_Subtype
(E
, True);
4162 Set_Stored_Constraint
(E
, No_Elist
);
4163 Set_Full_View
(E
, Empty
);
4164 Init_Size_Align
(E
);
4165 end Decorate_Incomplete_Type
;
4167 --------------------------
4168 -- Decorate_Tagged_Type --
4169 --------------------------
4171 procedure Decorate_Tagged_Type
4179 Decorate_Incomplete_Type
(T
, Scop
);
4180 Set_Is_Tagged_Type
(T
);
4182 -- Build corresponding class_wide type, if not previously done
4184 if No
(Class_Wide_Type
(T
)) then
4185 CW
:= Make_Defining_Identifier
(Loc
, New_Internal_Name
('S'));
4187 Set_Ekind
(CW
, E_Class_Wide_Type
);
4189 Set_Scope
(CW
, Scop
);
4190 Set_Is_Tagged_Type
(CW
);
4191 Set_Is_First_Subtype
(CW
, True);
4192 Init_Size_Align
(CW
);
4193 Set_Has_Unknown_Discriminants
(CW
, True);
4194 Set_Class_Wide_Type
(CW
, CW
);
4195 Set_Equivalent_Type
(CW
, Empty
);
4196 Set_From_With_Type
(CW
, From_With_Type
(T
));
4198 Set_Class_Wide_Type
(T
, CW
);
4200 end Decorate_Tagged_Type
;
4202 ------------------------------------
4203 -- Decorate_Package_Specification --
4204 ------------------------------------
4206 procedure Decorate_Package_Specification
(P
: Entity_Id
) is
4208 -- Place only the most basic attributes
4210 Set_Ekind
(P
, E_Package
);
4211 Set_Etype
(P
, Standard_Void_Type
);
4212 end Decorate_Package_Specification
;
4214 -------------------------
4215 -- New_Internal_Entity --
4216 -------------------------
4218 function New_Internal_Shadow_Entity
4219 (Kind
: Entity_Kind
;
4220 Sloc_Value
: Source_Ptr
;
4221 Id_Char
: Character) return Entity_Id
4223 E
: constant Entity_Id
:=
4224 Make_Defining_Identifier
(Sloc_Value
,
4225 Chars
=> New_Internal_Name
(Id_Char
));
4228 Set_Ekind
(E
, Kind
);
4229 Set_Is_Internal
(E
, True);
4231 if Kind
in Type_Kind
then
4232 Init_Size_Align
(E
);
4235 Append_Entity
(E
, Lim_Header
);
4238 end New_Internal_Shadow_Entity
;
4244 procedure Build_Chain
4246 First_Decl
: Node_Id
)
4248 Analyzed_Unit
: constant Boolean := Analyzed
(Cunit
(Unum
));
4249 Is_Tagged
: Boolean;
4254 while Present
(Decl
) loop
4256 -- For each library_package_declaration in the environment, there
4257 -- is an implicit declaration of a *limited view* of that library
4258 -- package. The limited view of a package contains:
4260 -- * For each nested package_declaration, a declaration of the
4261 -- limited view of that package, with the same defining-
4262 -- program-unit name.
4264 -- * For each type_declaration in the visible part, an incomplete
4265 -- type-declaration with the same defining_identifier, whose
4266 -- completion is the type_declaration. If the type_declaration
4267 -- is tagged, then the incomplete_type_declaration is tagged
4270 if Nkind
(Decl
) = N_Full_Type_Declaration
then
4272 Nkind
(Type_Definition
(Decl
)) = N_Record_Definition
4273 and then Tagged_Present
(Type_Definition
(Decl
));
4275 Comp_Typ
:= Defining_Identifier
(Decl
);
4277 if not Analyzed_Unit
then
4279 Decorate_Tagged_Type
(Sloc
(Decl
), Comp_Typ
, Scope
);
4281 Decorate_Incomplete_Type
(Comp_Typ
, Scope
);
4285 -- Create shadow entity for type
4287 Lim_Typ
:= New_Internal_Shadow_Entity
4288 (Kind
=> Ekind
(Comp_Typ
),
4289 Sloc_Value
=> Sloc
(Comp_Typ
),
4292 Set_Chars
(Lim_Typ
, Chars
(Comp_Typ
));
4293 Set_Parent
(Lim_Typ
, Parent
(Comp_Typ
));
4294 Set_From_With_Type
(Lim_Typ
);
4297 Decorate_Tagged_Type
(Sloc
(Decl
), Lim_Typ
, Scope
);
4299 Decorate_Incomplete_Type
(Lim_Typ
, Scope
);
4302 Set_Non_Limited_View
(Lim_Typ
, Comp_Typ
);
4304 elsif Nkind
(Decl
) = N_Private_Type_Declaration
then
4305 Comp_Typ
:= Defining_Identifier
(Decl
);
4307 if not Analyzed_Unit
then
4308 if Tagged_Present
(Decl
) then
4309 Decorate_Tagged_Type
(Sloc
(Decl
), Comp_Typ
, Scope
);
4311 Decorate_Incomplete_Type
(Comp_Typ
, Scope
);
4315 Lim_Typ
:= New_Internal_Shadow_Entity
4316 (Kind
=> Ekind
(Comp_Typ
),
4317 Sloc_Value
=> Sloc
(Comp_Typ
),
4320 Set_Chars
(Lim_Typ
, Chars
(Comp_Typ
));
4321 Set_Parent
(Lim_Typ
, Parent
(Comp_Typ
));
4322 Set_From_With_Type
(Lim_Typ
);
4324 if Tagged_Present
(Decl
) then
4325 Decorate_Tagged_Type
(Sloc
(Decl
), Lim_Typ
, Scope
);
4327 Decorate_Incomplete_Type
(Lim_Typ
, Scope
);
4330 Set_Non_Limited_View
(Lim_Typ
, Comp_Typ
);
4332 elsif Nkind
(Decl
) = N_Private_Extension_Declaration
then
4333 Comp_Typ
:= Defining_Identifier
(Decl
);
4335 if not Analyzed_Unit
then
4336 Decorate_Tagged_Type
(Sloc
(Decl
), Comp_Typ
, Scope
);
4339 -- Create shadow entity for type
4341 Lim_Typ
:= New_Internal_Shadow_Entity
4342 (Kind
=> Ekind
(Comp_Typ
),
4343 Sloc_Value
=> Sloc
(Comp_Typ
),
4346 Set_Chars
(Lim_Typ
, Chars
(Comp_Typ
));
4347 Set_Parent
(Lim_Typ
, Parent
(Comp_Typ
));
4348 Set_From_With_Type
(Lim_Typ
);
4350 Decorate_Tagged_Type
(Sloc
(Decl
), Lim_Typ
, Scope
);
4351 Set_Non_Limited_View
(Lim_Typ
, Comp_Typ
);
4353 elsif Nkind
(Decl
) = N_Package_Declaration
then
4358 Spec
: constant Node_Id
:= Specification
(Decl
);
4361 Comp_Typ
:= Defining_Unit_Name
(Spec
);
4363 if not Analyzed
(Cunit
(Unum
)) then
4364 Decorate_Package_Specification
(Comp_Typ
);
4365 Set_Scope
(Comp_Typ
, Scope
);
4368 Lim_Typ
:= New_Internal_Shadow_Entity
4369 (Kind
=> Ekind
(Comp_Typ
),
4370 Sloc_Value
=> Sloc
(Comp_Typ
),
4373 Decorate_Package_Specification
(Lim_Typ
);
4374 Set_Scope
(Lim_Typ
, Scope
);
4376 Set_Chars
(Lim_Typ
, Chars
(Comp_Typ
));
4377 Set_Parent
(Lim_Typ
, Parent
(Comp_Typ
));
4378 Set_From_With_Type
(Lim_Typ
);
4380 -- Note: The non_limited_view attribute is not used
4381 -- for local packages.
4385 First_Decl
=> First
(Visible_Declarations
(Spec
)));
4393 -- Start of processing for Build_Limited_Views
4396 pragma Assert
(Limited_Present
(N
));
4398 -- A library_item mentioned in a limited_with_clause shall be
4399 -- a package_declaration, not a subprogram_declaration,
4400 -- generic_declaration, generic_instantiation, or
4401 -- package_renaming_declaration
4403 case Nkind
(Unit
(Library_Unit
(N
))) is
4405 when N_Package_Declaration
=>
4408 when N_Subprogram_Declaration
=>
4409 Error_Msg_N
("subprograms not allowed in "
4410 & "limited with_clauses", N
);
4413 when N_Generic_Package_Declaration |
4414 N_Generic_Subprogram_Declaration
=>
4415 Error_Msg_N
("generics not allowed in "
4416 & "limited with_clauses", N
);
4419 when N_Generic_Instantiation
=>
4420 Error_Msg_N
("generic instantiations not allowed in "
4421 & "limited with_clauses", N
);
4424 when N_Generic_Renaming_Declaration
=>
4425 Error_Msg_N
("generic renamings not allowed in "
4426 & "limited with_clauses", N
);
4429 when N_Subprogram_Renaming_Declaration
=>
4430 Error_Msg_N
("renamed subprograms not allowed in "
4431 & "limited with_clauses", N
);
4434 when N_Package_Renaming_Declaration
=>
4435 Error_Msg_N
("renamed packages not allowed in "
4436 & "limited with_clauses", N
);
4440 raise Program_Error
;
4443 -- Check if the chain is already built
4445 Spec
:= Specification
(Unit
(Library_Unit
(N
)));
4447 if Limited_View_Installed
(Spec
) then
4451 Set_Ekind
(P
, E_Package
);
4453 -- Build the header of the limited_view
4455 Lim_Header
:= Make_Defining_Identifier
(Sloc
(N
),
4456 Chars
=> New_Internal_Name
(Id_Char
=> 'Z'));
4457 Set_Ekind
(Lim_Header
, E_Package
);
4458 Set_Is_Internal
(Lim_Header
);
4459 Set_Limited_View
(P
, Lim_Header
);
4461 -- Create the auxiliary chain. All the shadow entities are appended
4462 -- to the list of entities of the limited-view header
4466 First_Decl
=> First
(Visible_Declarations
(Spec
)));
4468 -- Save the last built shadow entity. It is needed later to set the
4469 -- reference to the first shadow entity in the private part
4471 Last_Pub_Lim_E
:= Last_Lim_E
;
4473 -- Ada 2005 (AI-262): Add the limited view of the private declarations
4474 -- Required to give support to limited-private-with clauses
4476 Build_Chain
(Scope
=> P
,
4477 First_Decl
=> First
(Private_Declarations
(Spec
)));
4479 if Last_Pub_Lim_E
/= Empty
then
4480 Set_First_Private_Entity
(Lim_Header
,
4481 Next_Entity
(Last_Pub_Lim_E
));
4483 Set_First_Private_Entity
(Lim_Header
,
4487 Set_Limited_View_Installed
(Spec
);
4488 end Build_Limited_Views
;
4490 -------------------------------
4491 -- Check_Body_Needed_For_SAL --
4492 -------------------------------
4494 procedure Check_Body_Needed_For_SAL
(Unit_Name
: Entity_Id
) is
4496 function Entity_Needs_Body
(E
: Entity_Id
) return Boolean;
4497 -- Determine whether use of entity E might require the presence
4498 -- of its body. For a package this requires a recursive traversal
4499 -- of all nested declarations.
4501 ---------------------------
4502 -- Entity_Needed_For_SAL --
4503 ---------------------------
4505 function Entity_Needs_Body
(E
: Entity_Id
) return Boolean is
4509 if Is_Subprogram
(E
)
4510 and then Has_Pragma_Inline
(E
)
4514 elsif Ekind
(E
) = E_Generic_Function
4515 or else Ekind
(E
) = E_Generic_Procedure
4519 elsif Ekind
(E
) = E_Generic_Package
4521 Nkind
(Unit_Declaration_Node
(E
)) = N_Generic_Package_Declaration
4522 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(E
)))
4526 elsif Ekind
(E
) = E_Package
4528 Nkind
(Unit_Declaration_Node
(E
)) = N_Package_Declaration
4529 and then Present
(Corresponding_Body
(Unit_Declaration_Node
(E
)))
4531 Ent
:= First_Entity
(E
);
4532 while Present
(Ent
) loop
4533 if Entity_Needs_Body
(Ent
) then
4545 end Entity_Needs_Body
;
4547 -- Start of processing for Check_Body_Needed_For_SAL
4550 if Ekind
(Unit_Name
) = E_Generic_Package
4552 Nkind
(Unit_Declaration_Node
(Unit_Name
)) =
4553 N_Generic_Package_Declaration
4555 Present
(Corresponding_Body
(Unit_Declaration_Node
(Unit_Name
)))
4557 Set_Body_Needed_For_SAL
(Unit_Name
);
4559 elsif Ekind
(Unit_Name
) = E_Generic_Procedure
4560 or else Ekind
(Unit_Name
) = E_Generic_Function
4562 Set_Body_Needed_For_SAL
(Unit_Name
);
4564 elsif Is_Subprogram
(Unit_Name
)
4565 and then Nkind
(Unit_Declaration_Node
(Unit_Name
)) =
4566 N_Subprogram_Declaration
4567 and then Has_Pragma_Inline
(Unit_Name
)
4569 Set_Body_Needed_For_SAL
(Unit_Name
);
4571 elsif Ekind
(Unit_Name
) = E_Subprogram_Body
then
4572 Check_Body_Needed_For_SAL
4573 (Corresponding_Spec
(Unit_Declaration_Node
(Unit_Name
)));
4575 elsif Ekind
(Unit_Name
) = E_Package
4576 and then Entity_Needs_Body
(Unit_Name
)
4578 Set_Body_Needed_For_SAL
(Unit_Name
);
4580 elsif Ekind
(Unit_Name
) = E_Package_Body
4581 and then Nkind
(Unit_Declaration_Node
(Unit_Name
)) = N_Package_Body
4583 Check_Body_Needed_For_SAL
4584 (Corresponding_Spec
(Unit_Declaration_Node
(Unit_Name
)));
4586 end Check_Body_Needed_For_SAL
;
4588 --------------------
4589 -- Remove_Context --
4590 --------------------
4592 procedure Remove_Context
(N
: Node_Id
) is
4593 Lib_Unit
: constant Node_Id
:= Unit
(N
);
4596 -- If this is a child unit, first remove the parent units
4598 if Is_Child_Spec
(Lib_Unit
) then
4599 Remove_Parents
(Lib_Unit
);
4602 Remove_Context_Clauses
(N
);
4605 ----------------------------
4606 -- Remove_Context_Clauses --
4607 ----------------------------
4609 procedure Remove_Context_Clauses
(N
: Node_Id
) is
4611 Unit_Name
: Entity_Id
;
4614 -- Ada 2005 (AI-50217): We remove the context clauses in two phases:
4615 -- limited-views first and regular-views later (to maintain the
4618 -- First Phase: Remove limited_with context clauses
4620 Item
:= First
(Context_Items
(N
));
4621 while Present
(Item
) loop
4623 -- We are interested only in with clauses which got installed
4626 if Nkind
(Item
) = N_With_Clause
4627 and then Limited_Present
(Item
)
4628 and then Limited_View_Installed
(Item
)
4630 Remove_Limited_With_Clause
(Item
);
4636 -- Second Phase: Loop through context items and undo regular
4637 -- with_clauses and use_clauses.
4639 Item
:= First
(Context_Items
(N
));
4640 while Present
(Item
) loop
4642 -- We are interested only in with clauses which got installed
4643 -- on entry, as indicated by their Context_Installed flag set
4645 if Nkind
(Item
) = N_With_Clause
4646 and then Limited_Present
(Item
)
4647 and then Limited_View_Installed
(Item
)
4651 elsif Nkind
(Item
) = N_With_Clause
4652 and then Context_Installed
(Item
)
4654 -- Remove items from one with'ed unit
4656 Unit_Name
:= Entity
(Name
(Item
));
4657 Remove_Unit_From_Visibility
(Unit_Name
);
4658 Set_Context_Installed
(Item
, False);
4660 elsif Nkind
(Item
) = N_Use_Package_Clause
then
4661 End_Use_Package
(Item
);
4663 elsif Nkind
(Item
) = N_Use_Type_Clause
then
4664 End_Use_Type
(Item
);
4666 elsif Nkind
(Item
) = N_With_Type_Clause
then
4667 Remove_With_Type_Clause
(Name
(Item
));
4672 end Remove_Context_Clauses
;
4674 --------------------------------
4675 -- Remove_Limited_With_Clause --
4676 --------------------------------
4678 procedure Remove_Limited_With_Clause
(N
: Node_Id
) is
4679 P_Unit
: constant Entity_Id
:= Unit
(Library_Unit
(N
));
4681 Lim_Header
: Entity_Id
;
4682 Lim_Typ
: Entity_Id
;
4686 pragma Assert
(Limited_View_Installed
(N
));
4688 -- In case of limited with_clause on subprograms, generics, instances,
4689 -- or renamings, the corresponding error was previously posted and we
4690 -- have nothing to do here.
4692 if Nkind
(P_Unit
) /= N_Package_Declaration
then
4696 P
:= Defining_Unit_Name
(Specification
(P_Unit
));
4698 -- Handle child packages
4700 if Nkind
(P
) = N_Defining_Program_Unit_Name
then
4701 P
:= Defining_Identifier
(P
);
4704 if Debug_Flag_I
then
4705 Write_Str
("remove limited view of ");
4706 Write_Name
(Chars
(P
));
4707 Write_Str
(" from visibility");
4711 -- Prepare the removal of the shadow entities from visibility. The
4712 -- first element of the limited view is a header (an E_Package
4713 -- entity) that is used to reference the first shadow entity in the
4714 -- private part of the package
4716 Lim_Header
:= Limited_View
(P
);
4717 Lim_Typ
:= First_Entity
(Lim_Header
);
4719 -- Remove package and shadow entities from visibility if it has not
4722 if not Analyzed
(P_Unit
) then
4724 Set_Is_Immediately_Visible
(P
, False);
4726 while Present
(Lim_Typ
) loop
4728 Next_Entity
(Lim_Typ
);
4731 -- Otherwise this package has already appeared in the closure and its
4732 -- shadow entities must be replaced by its real entities. This code
4733 -- must be kept synchronized with the complementary code in Install
4734 -- Limited_Withed_Unit.
4737 -- Real entities that are type or subtype declarations were hidden
4738 -- from visibility at the point of installation of the limited-view.
4739 -- Now we recover the previous value of the hidden attribute.
4745 E
:= First_Entity
(P
);
4746 while Present
(E
) and then E
/= First_Private_Entity
(P
) loop
4748 Set_Is_Hidden
(E
, Was_Hidden
(E
));
4755 while Present
(Lim_Typ
)
4756 and then Lim_Typ
/= First_Private_Entity
(Lim_Header
)
4758 pragma Assert
(not In_Chain
(Non_Limited_View
(Lim_Typ
)));
4760 -- Child units have not been unchained
4762 if not Is_Child_Unit
(Non_Limited_View
(Lim_Typ
)) then
4763 Prev
:= Current_Entity
(Lim_Typ
);
4765 if Prev
= Lim_Typ
then
4766 Set_Current_Entity
(Non_Limited_View
(Lim_Typ
));
4768 while Present
(Prev
)
4769 and then Homonym
(Prev
) /= Lim_Typ
4771 Prev
:= Homonym
(Prev
);
4774 pragma Assert
(Present
(Prev
));
4775 Set_Homonym
(Prev
, Non_Limited_View
(Lim_Typ
));
4778 -- We must also set the next homonym entity of the real entity
4779 -- to handle the case in which the next homonym was a shadow
4782 Set_Homonym
(Non_Limited_View
(Lim_Typ
), Homonym
(Lim_Typ
));
4785 Next_Entity
(Lim_Typ
);
4789 -- Indicate that the limited view of the package is not installed
4791 Set_From_With_Type
(P
, False);
4792 Set_Limited_View_Installed
(N
, False);
4793 end Remove_Limited_With_Clause
;
4795 --------------------
4796 -- Remove_Parents --
4797 --------------------
4799 procedure Remove_Parents
(Lib_Unit
: Node_Id
) is
4802 P_Spec
: Node_Id
:= Empty
;
4804 Vis
: constant Boolean :=
4805 Scope_Stack
.Table
(Scope_Stack
.Last
).Previous_Visibility
;
4808 if Is_Child_Spec
(Lib_Unit
) then
4809 P_Spec
:= Parent_Spec
(Lib_Unit
);
4811 elsif Nkind
(Lib_Unit
) = N_Package_Body
4812 and then Nkind
(Original_Node
(Lib_Unit
)) = N_Package_Instantiation
4814 P_Spec
:= Parent_Spec
(Original_Node
(Lib_Unit
));
4817 if Present
(P_Spec
) then
4820 P_Name
:= Get_Parent_Entity
(P
);
4821 Remove_Context_Clauses
(P_Spec
);
4822 End_Package_Scope
(P_Name
);
4823 Set_Is_Immediately_Visible
(P_Name
, Vis
);
4825 -- Remove from visibility the siblings as well, which are directly
4826 -- visible while the parent is in scope.
4828 E
:= First_Entity
(P_Name
);
4829 while Present
(E
) loop
4830 if Is_Child_Unit
(E
) then
4831 Set_Is_Immediately_Visible
(E
, False);
4837 Set_In_Package_Body
(P_Name
, False);
4839 -- This is the recursive call to remove the context of any
4840 -- higher level parent. This recursion ensures that all parents
4841 -- are removed in the reverse order of their installation.
4847 -----------------------------
4848 -- Remove_With_Type_Clause --
4849 -----------------------------
4851 procedure Remove_With_Type_Clause
(Name
: Node_Id
) is
4855 procedure Unchain
(E
: Entity_Id
);
4856 -- Remove entity from visibility list
4862 procedure Unchain
(E
: Entity_Id
) is
4866 Prev
:= Current_Entity
(E
);
4868 -- Package entity may appear is several with_type_clauses, and
4869 -- may have been removed already.
4875 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
4878 while Present
(Prev
)
4879 and then Homonym
(Prev
) /= E
4881 Prev
:= Homonym
(Prev
);
4884 if Present
(Prev
) then
4885 Set_Homonym
(Prev
, Homonym
(E
));
4890 -- Start of processing for Remove_With_Type_Clause
4893 if Nkind
(Name
) = N_Selected_Component
then
4894 Typ
:= Entity
(Selector_Name
(Name
));
4896 -- If no Typ, then error in declaration, ignore
4907 -- If the exporting package has been analyzed, it has appeared in the
4908 -- context already and should be left alone. Otherwise, remove from
4911 if not Analyzed
(Unit_Declaration_Node
(P
)) then
4914 Set_Is_Frozen
(Typ
, False);
4917 if Ekind
(Typ
) = E_Record_Type
then
4918 Set_From_With_Type
(Class_Wide_Type
(Typ
), False);
4919 Set_From_With_Type
(Typ
, False);
4922 Set_From_With_Type
(P
, False);
4924 -- If P is a child unit, remove parents as well
4928 and then P
/= Standard_Standard
4930 Set_From_With_Type
(P
, False);
4932 if not Analyzed
(Unit_Declaration_Node
(P
)) then
4939 -- The back-end needs to know that an access type is imported, so it
4940 -- does not need elaboration and can appear in a mutually recursive
4941 -- record definition, so the imported flag on an access type is
4944 end Remove_With_Type_Clause
;
4946 ---------------------------------
4947 -- Remove_Unit_From_Visibility --
4948 ---------------------------------
4950 procedure Remove_Unit_From_Visibility
(Unit_Name
: Entity_Id
) is
4951 P
: constant Entity_Id
:= Scope
(Unit_Name
);
4955 if Debug_Flag_I
then
4956 Write_Str
("remove unit ");
4957 Write_Name
(Chars
(Unit_Name
));
4958 Write_Str
(" from visibility");
4962 if P
/= Standard_Standard
then
4963 Set_Is_Visible_Child_Unit
(Unit_Name
, False);
4966 Set_Is_Potentially_Use_Visible
(Unit_Name
, False);
4967 Set_Is_Immediately_Visible
(Unit_Name
, False);
4969 end Remove_Unit_From_Visibility
;
4975 procedure Unchain
(E
: Entity_Id
) is
4979 Prev
:= Current_Entity
(E
);
4985 Set_Name_Entity_Id
(Chars
(E
), Homonym
(E
));
4988 while Present
(Prev
)
4989 and then Homonym
(Prev
) /= E
4991 Prev
:= Homonym
(Prev
);
4994 if Present
(Prev
) then
4995 Set_Homonym
(Prev
, Homonym
(E
));
4999 if Debug_Flag_I
then
5000 Write_Str
(" (homonym) unchain ");
5001 Write_Name
(Chars
(E
));