1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2007, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree
; use Atree
;
27 with Debug
; use Debug
;
28 with Einfo
; use Einfo
;
29 with Elists
; use Elists
;
30 with Errout
; use Errout
;
31 with Exp_Tss
; use Exp_Tss
;
32 with Exp_Util
; use Exp_Util
;
33 with Fname
; use Fname
;
34 with Freeze
; use Freeze
;
35 with Impunit
; use Impunit
;
37 with Lib
.Load
; use Lib
.Load
;
38 with Lib
.Xref
; use Lib
.Xref
;
39 with Namet
; use Namet
;
40 with Nlists
; use Nlists
;
41 with Nmake
; use Nmake
;
43 with Output
; use Output
;
44 with Restrict
; use Restrict
;
45 with Rident
; use Rident
;
46 with Rtsfind
; use Rtsfind
;
48 with Sem_Cat
; use Sem_Cat
;
49 with Sem_Ch3
; use Sem_Ch3
;
50 with Sem_Ch4
; use Sem_Ch4
;
51 with Sem_Ch6
; use Sem_Ch6
;
52 with Sem_Ch12
; use Sem_Ch12
;
53 with Sem_Disp
; use Sem_Disp
;
54 with Sem_Dist
; use Sem_Dist
;
55 with Sem_Res
; use Sem_Res
;
56 with Sem_Util
; use Sem_Util
;
57 with Sem_Type
; use Sem_Type
;
58 with Stand
; use Stand
;
59 with Sinfo
; use Sinfo
;
60 with Sinfo
.CN
; use Sinfo
.CN
;
61 with Snames
; use Snames
;
62 with Style
; use Style
;
64 with Tbuild
; use Tbuild
;
65 with Uintp
; use Uintp
;
67 with GNAT
.Spelling_Checker
; use GNAT
.Spelling_Checker
;
69 package body Sem_Ch8
is
71 ------------------------------------
72 -- Visibility and Name Resolution --
73 ------------------------------------
75 -- This package handles name resolution and the collection of
76 -- interpretations for overloaded names, prior to overload resolution.
78 -- Name resolution is the process that establishes a mapping between source
79 -- identifiers and the entities they denote at each point in the program.
80 -- Each entity is represented by a defining occurrence. Each identifier
81 -- that denotes an entity points to the corresponding defining occurrence.
82 -- This is the entity of the applied occurrence. Each occurrence holds
83 -- an index into the names table, where source identifiers are stored.
85 -- Each entry in the names table for an identifier or designator uses the
86 -- Info pointer to hold a link to the currently visible entity that has
87 -- this name (see subprograms Get_Name_Entity_Id and Set_Name_Entity_Id
88 -- in package Sem_Util). The visibility is initialized at the beginning of
89 -- semantic processing to make entities in package Standard immediately
90 -- visible. The visibility table is used in a more subtle way when
91 -- compiling subunits (see below).
93 -- Entities that have the same name (i.e. homonyms) are chained. In the
94 -- case of overloaded entities, this chain holds all the possible meanings
95 -- of a given identifier. The process of overload resolution uses type
96 -- information to select from this chain the unique meaning of a given
99 -- Entities are also chained in their scope, through the Next_Entity link.
100 -- As a consequence, the name space is organized as a sparse matrix, where
101 -- each row corresponds to a scope, and each column to a source identifier.
102 -- Open scopes, that is to say scopes currently being compiled, have their
103 -- corresponding rows of entities in order, innermost scope first.
105 -- The scopes of packages that are mentioned in context clauses appear in
106 -- no particular order, interspersed among open scopes. This is because
107 -- in the course of analyzing the context of a compilation, a package
108 -- declaration is first an open scope, and subsequently an element of the
109 -- context. If subunits or child units are present, a parent unit may
110 -- appear under various guises at various times in the compilation.
112 -- When the compilation of the innermost scope is complete, the entities
113 -- defined therein are no longer visible. If the scope is not a package
114 -- declaration, these entities are never visible subsequently, and can be
115 -- removed from visibility chains. If the scope is a package declaration,
116 -- its visible declarations may still be accessible. Therefore the entities
117 -- defined in such a scope are left on the visibility chains, and only
118 -- their visibility (immediately visibility or potential use-visibility)
121 -- The ordering of homonyms on their chain does not necessarily follow
122 -- the order of their corresponding scopes on the scope stack. For
123 -- example, if package P and the enclosing scope both contain entities
124 -- named E, then when compiling the package body the chain for E will
125 -- hold the global entity first, and the local one (corresponding to
126 -- the current inner scope) next. As a result, name resolution routines
127 -- do not assume any relative ordering of the homonym chains, either
128 -- for scope nesting or to order of appearance of context clauses.
130 -- When compiling a child unit, entities in the parent scope are always
131 -- immediately visible. When compiling the body of a child unit, private
132 -- entities in the parent must also be made immediately visible. There
133 -- are separate routines to make the visible and private declarations
134 -- visible at various times (see package Sem_Ch7).
136 -- +--------+ +-----+
137 -- | In use |-------->| EU1 |-------------------------->
138 -- +--------+ +-----+
140 -- +--------+ +-----+ +-----+
141 -- | Stand. |---------------->| ES1 |--------------->| ES2 |--->
142 -- +--------+ +-----+ +-----+
144 -- +---------+ | +-----+
145 -- | with'ed |------------------------------>| EW2 |--->
146 -- +---------+ | +-----+
148 -- +--------+ +-----+ +-----+
149 -- | Scope2 |---------------->| E12 |--------------->| E22 |--->
150 -- +--------+ +-----+ +-----+
152 -- +--------+ +-----+ +-----+
153 -- | Scope1 |---------------->| E11 |--------------->| E12 |--->
154 -- +--------+ +-----+ +-----+
158 -- | | with'ed |----------------------------------------->
162 -- (innermost first) | |
163 -- +----------------------------+
164 -- Names table => | Id1 | | | | Id2 |
165 -- +----------------------------+
167 -- Name resolution must deal with several syntactic forms: simple names,
168 -- qualified names, indexed names, and various forms of calls.
170 -- Each identifier points to an entry in the names table. The resolution
171 -- of a simple name consists in traversing the homonym chain, starting
172 -- from the names table. If an entry is immediately visible, it is the one
173 -- designated by the identifier. If only potentially use-visible entities
174 -- are on the chain, we must verify that they do not hide each other. If
175 -- the entity we find is overloadable, we collect all other overloadable
176 -- entities on the chain as long as they are not hidden.
178 -- To resolve expanded names, we must find the entity at the intersection
179 -- of the entity chain for the scope (the prefix) and the homonym chain
180 -- for the selector. In general, homonym chains will be much shorter than
181 -- entity chains, so it is preferable to start from the names table as
182 -- well. If the entity found is overloadable, we must collect all other
183 -- interpretations that are defined in the scope denoted by the prefix.
185 -- For records, protected types, and tasks, their local entities are
186 -- removed from visibility chains on exit from the corresponding scope.
187 -- From the outside, these entities are always accessed by selected
188 -- notation, and the entity chain for the record type, protected type,
189 -- etc. is traversed sequentially in order to find the designated entity.
191 -- The discriminants of a type and the operations of a protected type or
192 -- task are unchained on exit from the first view of the type, (such as
193 -- a private or incomplete type declaration, or a protected type speci-
194 -- fication) and re-chained when compiling the second view.
196 -- In the case of operators, we do not make operators on derived types
197 -- explicit. As a result, the notation P."+" may denote either a user-
198 -- defined function with name "+", or else an implicit declaration of the
199 -- operator "+" in package P. The resolution of expanded names always
200 -- tries to resolve an operator name as such an implicitly defined entity,
201 -- in addition to looking for explicit declarations.
203 -- All forms of names that denote entities (simple names, expanded names,
204 -- character literals in some cases) have a Entity attribute, which
205 -- identifies the entity denoted by the name.
207 ---------------------
208 -- The Scope Stack --
209 ---------------------
211 -- The Scope stack keeps track of the scopes currently been compiled.
212 -- Every entity that contains declarations (including records) is placed
213 -- on the scope stack while it is being processed, and removed at the end.
214 -- Whenever a non-package scope is exited, the entities defined therein
215 -- are removed from the visibility table, so that entities in outer scopes
216 -- become visible (see previous description). On entry to Sem, the scope
217 -- stack only contains the package Standard. As usual, subunits complicate
218 -- this picture ever so slightly.
220 -- The Rtsfind mechanism can force a call to Semantics while another
221 -- compilation is in progress. The unit retrieved by Rtsfind must be
222 -- compiled in its own context, and has no access to the visibility of
223 -- the unit currently being compiled. The procedures Save_Scope_Stack and
224 -- Restore_Scope_Stack make entities in current open scopes invisible
225 -- before compiling the retrieved unit, and restore the compilation
226 -- environment afterwards.
228 ------------------------
229 -- Compiling subunits --
230 ------------------------
232 -- Subunits must be compiled in the environment of the corresponding stub,
233 -- that is to say with the same visibility into the parent (and its
234 -- context) that is available at the point of the stub declaration, but
235 -- with the additional visibility provided by the context clause of the
236 -- subunit itself. As a result, compilation of a subunit forces compilation
237 -- of the parent (see description in lib-). At the point of the stub
238 -- declaration, Analyze is called recursively to compile the proper body of
239 -- the subunit, but without reinitializing the names table, nor the scope
240 -- stack (i.e. standard is not pushed on the stack). In this fashion the
241 -- context of the subunit is added to the context of the parent, and the
242 -- subunit is compiled in the correct environment. Note that in the course
243 -- of processing the context of a subunit, Standard will appear twice on
244 -- the scope stack: once for the parent of the subunit, and once for the
245 -- unit in the context clause being compiled. However, the two sets of
246 -- entities are not linked by homonym chains, so that the compilation of
247 -- any context unit happens in a fresh visibility environment.
249 -------------------------------
250 -- Processing of USE Clauses --
251 -------------------------------
253 -- Every defining occurrence has a flag indicating if it is potentially use
254 -- visible. Resolution of simple names examines this flag. The processing
255 -- of use clauses consists in setting this flag on all visible entities
256 -- defined in the corresponding package. On exit from the scope of the use
257 -- clause, the corresponding flag must be reset. However, a package may
258 -- appear in several nested use clauses (pathological but legal, alas!)
259 -- which forces us to use a slightly more involved scheme:
261 -- a) The defining occurrence for a package holds a flag -In_Use- to
262 -- indicate that it is currently in the scope of a use clause. If a
263 -- redundant use clause is encountered, then the corresponding occurrence
264 -- of the package name is flagged -Redundant_Use-.
266 -- b) On exit from a scope, the use clauses in its declarative part are
267 -- scanned. The visibility flag is reset in all entities declared in
268 -- package named in a use clause, as long as the package is not flagged
269 -- as being in a redundant use clause (in which case the outer use
270 -- clause is still in effect, and the direct visibility of its entities
271 -- must be retained).
273 -- Note that entities are not removed from their homonym chains on exit
274 -- from the package specification. A subsequent use clause does not need
275 -- to rechain the visible entities, but only to establish their direct
278 -----------------------------------
279 -- Handling private declarations --
280 -----------------------------------
282 -- The principle that each entity has a single defining occurrence clashes
283 -- with the presence of two separate definitions for private types: the
284 -- first is the private type declaration, and second is the full type
285 -- declaration. It is important that all references to the type point to
286 -- the same defining occurrence, namely the first one. To enforce the two
287 -- separate views of the entity, the corresponding information is swapped
288 -- between the two declarations. Outside of the package, the defining
289 -- occurrence only contains the private declaration information, while in
290 -- the private part and the body of the package the defining occurrence
291 -- contains the full declaration. To simplify the swap, the defining
292 -- occurrence that currently holds the private declaration points to the
293 -- full declaration. During semantic processing the defining occurrence
294 -- also points to a list of private dependents, that is to say access types
295 -- or composite types whose designated types or component types are
296 -- subtypes or derived types of the private type in question. After the
297 -- full declaration has been seen, the private dependents are updated to
298 -- indicate that they have full definitions.
300 ------------------------------------
301 -- Handling of Undefined Messages --
302 ------------------------------------
304 -- In normal mode, only the first use of an undefined identifier generates
305 -- a message. The table Urefs is used to record error messages that have
306 -- been issued so that second and subsequent ones do not generate further
307 -- messages. However, the second reference causes text to be added to the
308 -- original undefined message noting "(more references follow)". The
309 -- full error list option (-gnatf) forces messages to be generated for
310 -- every reference and disconnects the use of this table.
312 type Uref_Entry
is record
314 -- Node for identifier for which original message was posted. The
315 -- Chars field of this identifier is used to detect later references
316 -- to the same identifier.
319 -- Records error message Id of original undefined message. Reset to
320 -- No_Error_Msg after the second occurrence, where it is used to add
321 -- text to the original message as described above.
324 -- Set if the message is not visible rather than undefined
327 -- Records location of error message. Used to make sure that we do
328 -- not consider a, b : undefined as two separate instances, which
329 -- would otherwise happen, since the parser converts this sequence
330 -- to a : undefined; b : undefined.
334 package Urefs
is new Table
.Table
(
335 Table_Component_Type
=> Uref_Entry
,
336 Table_Index_Type
=> Nat
,
337 Table_Low_Bound
=> 1,
339 Table_Increment
=> 100,
340 Table_Name
=> "Urefs");
342 Candidate_Renaming
: Entity_Id
;
343 -- Holds a candidate interpretation that appears in a subprogram renaming
344 -- declaration and does not match the given specification, but matches at
345 -- least on the first formal. Allows better error message when given
346 -- specification omits defaulted parameters, a common error.
348 -----------------------
349 -- Local Subprograms --
350 -----------------------
352 procedure Analyze_Generic_Renaming
355 -- Common processing for all three kinds of generic renaming declarations.
356 -- Enter new name and indicate that it renames the generic unit.
358 procedure Analyze_Renamed_Character
362 -- Renamed entity is given by a character literal, which must belong
363 -- to the return type of the new entity. Is_Body indicates whether the
364 -- declaration is a renaming_as_body. If the original declaration has
365 -- already been frozen (because of an intervening body, e.g.) the body of
366 -- the function must be built now. The same applies to the following
367 -- various renaming procedures.
369 procedure Analyze_Renamed_Dereference
373 -- Renamed entity is given by an explicit dereference. Prefix must be a
374 -- conformant access_to_subprogram type.
376 procedure Analyze_Renamed_Entry
380 -- If the renamed entity in a subprogram renaming is an entry or protected
381 -- subprogram, build a body for the new entity whose only statement is a
382 -- call to the renamed entity.
384 procedure Analyze_Renamed_Family_Member
388 -- Used when the renamed entity is an indexed component. The prefix must
389 -- denote an entry family.
391 function Applicable_Use
(Pack_Name
: Node_Id
) return Boolean;
392 -- Common code to Use_One_Package and Set_Use, to determine whether
393 -- use clause must be processed. Pack_Name is an entity name that
394 -- references the package in question.
396 procedure Attribute_Renaming
(N
: Node_Id
);
397 -- Analyze renaming of attribute as function. The renaming declaration N
398 -- is rewritten as a function body that returns the attribute reference
399 -- applied to the formals of the function.
401 procedure Check_Frozen_Renaming
(N
: Node_Id
; Subp
: Entity_Id
);
402 -- A renaming_as_body may occur after the entity of the original decla-
403 -- ration has been frozen. In that case, the body of the new entity must
404 -- be built now, because the usual mechanism of building the renamed
405 -- body at the point of freezing will not work. Subp is the subprogram
406 -- for which N provides the Renaming_As_Body.
408 procedure Check_In_Previous_With_Clause
411 -- N is a use_package clause and Nam the package name, or N is a use_type
412 -- clause and Nam is the prefix of the type name. In either case, verify
413 -- that the package is visible at that point in the context: either it
414 -- appears in a previous with_clause, or because it is a fully qualified
415 -- name and the root ancestor appears in a previous with_clause.
417 procedure Check_Library_Unit_Renaming
(N
: Node_Id
; Old_E
: Entity_Id
);
418 -- Verify that the entity in a renaming declaration that is a library unit
419 -- is itself a library unit and not a nested unit or subunit. Also check
420 -- that if the renaming is a child unit of a generic parent, then the
421 -- renamed unit must also be a child unit of that parent. Finally, verify
422 -- that a renamed generic unit is not an implicit child declared within
423 -- an instance of the parent.
425 procedure Chain_Use_Clause
(N
: Node_Id
);
426 -- Chain use clause onto list of uses clauses headed by First_Use_Clause in
427 -- the proper scope table entry. This is usually the current scope, but it
428 -- will be an inner scope when installing the use clauses of the private
429 -- declarations of a parent unit prior to compiling the private part of a
430 -- child unit. This chain is traversed when installing/removing use clauses
431 -- when compiling a subunit or instantiating a generic body on the fly,
432 -- when it is necessary to save and restore full environments.
434 function Has_Implicit_Character_Literal
(N
: Node_Id
) return Boolean;
435 -- Find a type derived from Character or Wide_Character in the prefix of N.
436 -- Used to resolved qualified names whose selector is a character literal.
438 function Has_Private_With
(E
: Entity_Id
) return Boolean;
439 -- Ada 2005 (AI-262): Determines if the current compilation unit has a
440 -- private with on E.
442 procedure Find_Expanded_Name
(N
: Node_Id
);
443 -- Selected component is known to be expanded name. Verify legality
444 -- of selector given the scope denoted by prefix.
446 function Find_Renamed_Entity
450 Is_Actual
: Boolean := False) return Entity_Id
;
451 -- Find the renamed entity that corresponds to the given parameter profile
452 -- in a subprogram renaming declaration. The renamed entity may be an
453 -- operator, a subprogram, an entry, or a protected operation. Is_Actual
454 -- indicates that the renaming is the one generated for an actual subpro-
455 -- gram in an instance, for which special visibility checks apply.
457 function Has_Implicit_Operator
(N
: Node_Id
) return Boolean;
458 -- N is an expanded name whose selector is an operator name (eg P."+").
459 -- declarative part contains an implicit declaration of an operator if it
460 -- has a declaration of a type to which one of the predefined operators
461 -- apply. The existence of this routine is an implementation artifact. A
462 -- more straightforward but more space-consuming choice would be to make
463 -- all inherited operators explicit in the symbol table.
465 procedure Inherit_Renamed_Profile
(New_S
: Entity_Id
; Old_S
: Entity_Id
);
466 -- A subprogram defined by a renaming declaration inherits the parameter
467 -- profile of the renamed entity. The subtypes given in the subprogram
468 -- specification are discarded and replaced with those of the renamed
469 -- subprogram, which are then used to recheck the default values.
471 function Is_Appropriate_For_Record
(T
: Entity_Id
) return Boolean;
472 -- Prefix is appropriate for record if it is of a record type, or an access
475 function Is_Appropriate_For_Entry_Prefix
(T
: Entity_Id
) return Boolean;
476 -- True if it is of a task type, a protected type, or else an access to one
479 procedure Note_Redundant_Use
(Clause
: Node_Id
);
480 -- Mark the name in a use clause as redundant if the corresponding entity
481 -- is already use-visible. Emit a warning if the use clause comes from
482 -- source and the proper warnings are enabled.
484 procedure Premature_Usage
(N
: Node_Id
);
485 -- Diagnose usage of an entity before it is visible
487 procedure Use_One_Package
(P
: Entity_Id
; N
: Node_Id
);
488 -- Make visible entities declared in package P potentially use-visible
489 -- in the current context. Also used in the analysis of subunits, when
490 -- re-installing use clauses of parent units. N is the use_clause that
491 -- names P (and possibly other packages).
493 procedure Use_One_Type
(Id
: Node_Id
);
494 -- Id is the subtype mark from a use type clause. This procedure makes
495 -- the primitive operators of the type potentially use-visible.
497 procedure Write_Info
;
498 -- Write debugging information on entities declared in current scope
500 procedure Write_Scopes
;
501 pragma Warnings
(Off
, Write_Scopes
);
502 -- Debugging information: dump all entities on scope stack
504 --------------------------------
505 -- Analyze_Exception_Renaming --
506 --------------------------------
508 -- The language only allows a single identifier, but the tree holds an
509 -- identifier list. The parser has already issued an error message if
510 -- there is more than one element in the list.
512 procedure Analyze_Exception_Renaming
(N
: Node_Id
) is
513 Id
: constant Node_Id
:= Defining_Identifier
(N
);
514 Nam
: constant Node_Id
:= Name
(N
);
520 Set_Ekind
(Id
, E_Exception
);
521 Set_Exception_Code
(Id
, Uint_0
);
522 Set_Etype
(Id
, Standard_Exception_Type
);
523 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
525 if not Is_Entity_Name
(Nam
) or else
526 Ekind
(Entity
(Nam
)) /= E_Exception
528 Error_Msg_N
("invalid exception name in renaming", Nam
);
530 if Present
(Renamed_Object
(Entity
(Nam
))) then
531 Set_Renamed_Object
(Id
, Renamed_Object
(Entity
(Nam
)));
533 Set_Renamed_Object
(Id
, Entity
(Nam
));
536 end Analyze_Exception_Renaming
;
538 ---------------------------
539 -- Analyze_Expanded_Name --
540 ---------------------------
542 procedure Analyze_Expanded_Name
(N
: Node_Id
) is
544 -- If the entity pointer is already set, this is an internal node, or a
545 -- node that is analyzed more than once, after a tree modification. In
546 -- such a case there is no resolution to perform, just set the type. For
547 -- completeness, analyze prefix as well.
549 if Present
(Entity
(N
)) then
550 if Is_Type
(Entity
(N
)) then
551 Set_Etype
(N
, Entity
(N
));
553 Set_Etype
(N
, Etype
(Entity
(N
)));
556 Analyze
(Prefix
(N
));
559 Find_Expanded_Name
(N
);
561 end Analyze_Expanded_Name
;
563 ---------------------------------------
564 -- Analyze_Generic_Function_Renaming --
565 ---------------------------------------
567 procedure Analyze_Generic_Function_Renaming
(N
: Node_Id
) is
569 Analyze_Generic_Renaming
(N
, E_Generic_Function
);
570 end Analyze_Generic_Function_Renaming
;
572 --------------------------------------
573 -- Analyze_Generic_Package_Renaming --
574 --------------------------------------
576 procedure Analyze_Generic_Package_Renaming
(N
: Node_Id
) is
578 -- Apply the Text_IO Kludge here, since we may be renaming one of the
579 -- subpackages of Text_IO, then join common routine.
581 Text_IO_Kludge
(Name
(N
));
583 Analyze_Generic_Renaming
(N
, E_Generic_Package
);
584 end Analyze_Generic_Package_Renaming
;
586 ----------------------------------------
587 -- Analyze_Generic_Procedure_Renaming --
588 ----------------------------------------
590 procedure Analyze_Generic_Procedure_Renaming
(N
: Node_Id
) is
592 Analyze_Generic_Renaming
(N
, E_Generic_Procedure
);
593 end Analyze_Generic_Procedure_Renaming
;
595 ------------------------------
596 -- Analyze_Generic_Renaming --
597 ------------------------------
599 procedure Analyze_Generic_Renaming
603 New_P
: constant Entity_Id
:= Defining_Entity
(N
);
605 Inst
: Boolean := False; -- prevent junk warning
608 if Name
(N
) = Error
then
612 Generate_Definition
(New_P
);
614 if Current_Scope
/= Standard_Standard
then
615 Set_Is_Pure
(New_P
, Is_Pure
(Current_Scope
));
618 if Nkind
(Name
(N
)) = N_Selected_Component
then
619 Check_Generic_Child_Unit
(Name
(N
), Inst
);
624 if not Is_Entity_Name
(Name
(N
)) then
625 Error_Msg_N
("expect entity name in renaming declaration", Name
(N
));
628 Old_P
:= Entity
(Name
(N
));
632 Set_Ekind
(New_P
, K
);
634 if Etype
(Old_P
) = Any_Type
then
637 elsif Ekind
(Old_P
) /= K
then
638 Error_Msg_N
("invalid generic unit name", Name
(N
));
641 if Present
(Renamed_Object
(Old_P
)) then
642 Set_Renamed_Object
(New_P
, Renamed_Object
(Old_P
));
644 Set_Renamed_Object
(New_P
, Old_P
);
647 Set_Is_Pure
(New_P
, Is_Pure
(Old_P
));
648 Set_Is_Preelaborated
(New_P
, Is_Preelaborated
(Old_P
));
650 Set_Etype
(New_P
, Etype
(Old_P
));
651 Set_Has_Completion
(New_P
);
653 if In_Open_Scopes
(Old_P
) then
654 Error_Msg_N
("within its scope, generic denotes its instance", N
);
657 Check_Library_Unit_Renaming
(N
, Old_P
);
659 end Analyze_Generic_Renaming
;
661 -----------------------------
662 -- Analyze_Object_Renaming --
663 -----------------------------
665 procedure Analyze_Object_Renaming
(N
: Node_Id
) is
666 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
668 Nam
: constant Node_Id
:= Name
(N
);
672 function In_Generic_Scope
(E
: Entity_Id
) return Boolean;
673 -- Determine whether entity E is inside a generic cope
675 ----------------------
676 -- In_Generic_Scope --
677 ----------------------
679 function In_Generic_Scope
(E
: Entity_Id
) return Boolean is
684 while Present
(S
) and then S
/= Standard_Standard
loop
685 if Is_Generic_Unit
(S
) then
693 end In_Generic_Scope
;
695 -- Start of processing for Analyze_Object_Renaming
702 Set_Is_Pure
(Id
, Is_Pure
(Current_Scope
));
705 -- The renaming of a component that depends on a discriminant requires
706 -- an actual subtype, because in subsequent use of the object Gigi will
707 -- be unable to locate the actual bounds. This explicit step is required
708 -- when the renaming is generated in removing side effects of an
709 -- already-analyzed expression.
711 if Nkind
(Nam
) = N_Selected_Component
712 and then Analyzed
(Nam
)
715 Dec
:= Build_Actual_Subtype_Of_Component
(Etype
(Nam
), Nam
);
717 if Present
(Dec
) then
718 Insert_Action
(N
, Dec
);
719 T
:= Defining_Identifier
(Dec
);
723 -- Complete analysis of the subtype mark in any case, for ASIS use
725 if Present
(Subtype_Mark
(N
)) then
726 Find_Type
(Subtype_Mark
(N
));
729 elsif Present
(Subtype_Mark
(N
)) then
730 Find_Type
(Subtype_Mark
(N
));
731 T
:= Entity
(Subtype_Mark
(N
));
734 if Nkind
(Nam
) = N_Type_Conversion
735 and then not Is_Tagged_Type
(T
)
738 ("renaming of conversion only allowed for tagged types", Nam
);
743 -- Ada 2005 (AI-230/AI-254): Access renaming
745 else pragma Assert
(Present
(Access_Definition
(N
)));
746 T
:= Access_Definition
748 N
=> Access_Definition
(N
));
750 Analyze_And_Resolve
(Nam
, T
);
752 -- Ada 2005 (AI-231): "In the case where the type is defined by an
753 -- access_definition, the renamed entity shall be of an access-to-
754 -- constant type if and only if the access_definition defines an
755 -- access-to-constant type" ARM 8.5.1(4)
757 if Constant_Present
(Access_Definition
(N
))
758 and then not Is_Access_Constant
(Etype
(Nam
))
760 Error_Msg_N
("(Ada 2005): the renamed object is not "
761 & "access-to-constant (RM 8.5.1(6))", N
);
765 -- Special processing for renaming function return object
767 if Nkind
(Nam
) = N_Function_Call
768 and then Comes_From_Source
(Nam
)
772 -- Usage is illegal in Ada 83
776 ("(Ada 83) cannot rename function return object", Nam
);
778 -- In Ada 95, warn for odd case of renaming parameterless function
779 -- call if this is not a limited type (where this is useful)
782 if Warn_On_Object_Renames_Function
783 and then No
(Parameter_Associations
(Nam
))
784 and then not Is_Limited_Type
(Etype
(Nam
))
787 ("?renaming function result object is suspicious",
790 ("\?function & will be called only once",
791 Nam
, Entity
(Name
(Nam
)));
793 ("\?suggest using an initialized constant object instead",
799 -- An object renaming requires an exact match of the type. Class-wide
800 -- matching is not allowed.
802 if Is_Class_Wide_Type
(T
)
803 and then Base_Type
(Etype
(Nam
)) /= Base_Type
(T
)
810 -- (Ada 2005: AI-326): Handle wrong use of incomplete type
812 if Nkind
(Nam
) = N_Explicit_Dereference
813 and then Ekind
(Etype
(T2
)) = E_Incomplete_Type
815 Error_Msg_N
("invalid use of incomplete type", Id
);
821 if Ada_Version
>= Ada_05
822 and then Nkind
(Nam
) = N_Attribute_Reference
823 and then Attribute_Name
(Nam
) = Name_Priority
827 elsif Ada_Version
>= Ada_05
828 and then Nkind
(Nam
) in N_Has_Entity
831 Error_Node
: Node_Id
;
834 Subtyp_Decl
: Node_Id
;
837 if Nkind
(Nam
) = N_Attribute_Reference
then
838 Nam_Ent
:= Entity
(Prefix
(Nam
));
840 Nam_Ent
:= Entity
(Nam
);
843 Nam_Decl
:= Parent
(Nam_Ent
);
844 Subtyp_Decl
:= Parent
(Etype
(Nam_Ent
));
846 if Has_Null_Exclusion
(N
)
847 and then not Has_Null_Exclusion
(Nam_Decl
)
849 -- Ada 2005 (AI-423): If the object name denotes a generic
850 -- formal object of a generic unit G, and the object renaming
851 -- declaration occurs within the body of G or within the body
852 -- of a generic unit declared within the declarative region
853 -- of G, then the declaration of the formal object of G must
854 -- have a null exclusion.
856 if Is_Formal_Object
(Nam_Ent
)
857 and then In_Generic_Scope
(Id
)
859 if Present
(Subtype_Mark
(Nam_Decl
)) then
860 Error_Node
:= Subtype_Mark
(Nam_Decl
);
863 (Ada_Version
>= Ada_05
864 and then Present
(Access_Definition
(Nam_Decl
)));
866 Error_Node
:= Access_Definition
(Nam_Decl
);
870 ("`NOT NULL` required in formal object declaration",
872 Error_Msg_Sloc
:= Sloc
(N
);
874 ("\because of renaming # (RM 8.5.4(4))", Error_Node
);
876 -- Ada 2005 (AI-423): Otherwise, the subtype of the object name
877 -- shall exclude null.
879 elsif Nkind
(Subtyp_Decl
) = N_Subtype_Declaration
880 and then not Has_Null_Exclusion
(Subtyp_Decl
)
883 ("`NOT NULL` required for subtype & (RM 8.5.1(4.6/2))",
884 Defining_Identifier
(Subtyp_Decl
));
890 Set_Ekind
(Id
, E_Variable
);
891 Init_Size_Align
(Id
);
893 if T
= Any_Type
or else Etype
(Nam
) = Any_Type
then
896 -- Verify that the renamed entity is an object or a function call. It
897 -- may have been rewritten in several ways.
899 elsif Is_Object_Reference
(Nam
) then
900 if Comes_From_Source
(N
)
901 and then Is_Dependent_Component_Of_Mutable_Object
(Nam
)
904 ("illegal renaming of discriminant-dependent component", Nam
);
909 -- A static function call may have been folded into a literal
911 elsif Nkind
(Original_Node
(Nam
)) = N_Function_Call
913 -- When expansion is disabled, attribute reference is not
914 -- rewritten as function call. Otherwise it may be rewritten
915 -- as a conversion, so check original node.
917 or else (Nkind
(Original_Node
(Nam
)) = N_Attribute_Reference
918 and then Is_Function_Attribute_Name
919 (Attribute_Name
(Original_Node
(Nam
))))
921 -- Weird but legal, equivalent to renaming a function call.
922 -- Illegal if the literal is the result of constant-folding an
923 -- attribute reference that is not a function.
925 or else (Is_Entity_Name
(Nam
)
926 and then Ekind
(Entity
(Nam
)) = E_Enumeration_Literal
928 Nkind
(Original_Node
(Nam
)) /= N_Attribute_Reference
)
930 or else (Nkind
(Nam
) = N_Type_Conversion
931 and then Is_Tagged_Type
(Entity
(Subtype_Mark
(Nam
))))
935 elsif Nkind
(Nam
) = N_Type_Conversion
then
937 ("renaming of conversion only allowed for tagged types", Nam
);
941 elsif Ada_Version
>= Ada_05
942 and then Nkind
(Nam
) = N_Attribute_Reference
943 and then Attribute_Name
(Nam
) = Name_Priority
948 Error_Msg_N
("expect object name in renaming", Nam
);
953 if not Is_Variable
(Nam
) then
954 Set_Ekind
(Id
, E_Constant
);
955 Set_Never_Set_In_Source
(Id
, True);
956 Set_Is_True_Constant
(Id
, True);
959 Set_Renamed_Object
(Id
, Nam
);
960 end Analyze_Object_Renaming
;
962 ------------------------------
963 -- Analyze_Package_Renaming --
964 ------------------------------
966 procedure Analyze_Package_Renaming
(N
: Node_Id
) is
967 New_P
: constant Entity_Id
:= Defining_Entity
(N
);
972 if Name
(N
) = Error
then
976 -- Apply Text_IO kludge here, since we may be renaming one of the
977 -- children of Text_IO
979 Text_IO_Kludge
(Name
(N
));
981 if Current_Scope
/= Standard_Standard
then
982 Set_Is_Pure
(New_P
, Is_Pure
(Current_Scope
));
988 if Is_Entity_Name
(Name
(N
)) then
989 Old_P
:= Entity
(Name
(N
));
994 if Etype
(Old_P
) = Any_Type
then
996 ("expect package name in renaming", Name
(N
));
998 elsif Ekind
(Old_P
) /= E_Package
999 and then not (Ekind
(Old_P
) = E_Generic_Package
1000 and then In_Open_Scopes
(Old_P
))
1002 if Ekind
(Old_P
) = E_Generic_Package
then
1004 ("generic package cannot be renamed as a package", Name
(N
));
1006 Error_Msg_Sloc
:= Sloc
(Old_P
);
1008 ("expect package name in renaming, found& declared#",
1012 -- Set basic attributes to minimize cascaded errors
1014 Set_Ekind
(New_P
, E_Package
);
1015 Set_Etype
(New_P
, Standard_Void_Type
);
1018 -- Entities in the old package are accessible through the renaming
1019 -- entity. The simplest implementation is to have both packages share
1022 Set_Ekind
(New_P
, E_Package
);
1023 Set_Etype
(New_P
, Standard_Void_Type
);
1025 if Present
(Renamed_Object
(Old_P
)) then
1026 Set_Renamed_Object
(New_P
, Renamed_Object
(Old_P
));
1028 Set_Renamed_Object
(New_P
, Old_P
);
1031 Set_Has_Completion
(New_P
);
1033 Set_First_Entity
(New_P
, First_Entity
(Old_P
));
1034 Set_Last_Entity
(New_P
, Last_Entity
(Old_P
));
1035 Set_First_Private_Entity
(New_P
, First_Private_Entity
(Old_P
));
1036 Check_Library_Unit_Renaming
(N
, Old_P
);
1037 Generate_Reference
(Old_P
, Name
(N
));
1039 -- If this is the renaming declaration of a package instantiation
1040 -- within itself, it is the declaration that ends the list of actuals
1041 -- for the instantiation. At this point, the subtypes that rename
1042 -- the actuals are flagged as generic, to avoid spurious ambiguities
1043 -- if the actuals for two distinct formals happen to coincide. If
1044 -- the actual is a private type, the subtype has a private completion
1045 -- that is flagged in the same fashion.
1047 -- Resolution is identical to what is was in the original generic.
1048 -- On exit from the generic instance, these are turned into regular
1049 -- subtypes again, so they are compatible with types in their class.
1051 if not Is_Generic_Instance
(Old_P
) then
1054 Spec
:= Specification
(Unit_Declaration_Node
(Old_P
));
1057 if Nkind
(Spec
) = N_Package_Specification
1058 and then Present
(Generic_Parent
(Spec
))
1059 and then Old_P
= Current_Scope
1060 and then Chars
(New_P
) = Chars
(Generic_Parent
(Spec
))
1066 E
:= First_Entity
(Old_P
);
1071 and then Nkind
(Parent
(E
)) = N_Subtype_Declaration
1073 Set_Is_Generic_Actual_Type
(E
);
1075 if Is_Private_Type
(E
)
1076 and then Present
(Full_View
(E
))
1078 Set_Is_Generic_Actual_Type
(Full_View
(E
));
1088 end Analyze_Package_Renaming
;
1090 -------------------------------
1091 -- Analyze_Renamed_Character --
1092 -------------------------------
1094 procedure Analyze_Renamed_Character
1099 C
: constant Node_Id
:= Name
(N
);
1102 if Ekind
(New_S
) = E_Function
then
1103 Resolve
(C
, Etype
(New_S
));
1106 Check_Frozen_Renaming
(N
, New_S
);
1110 Error_Msg_N
("character literal can only be renamed as function", N
);
1112 end Analyze_Renamed_Character
;
1114 ---------------------------------
1115 -- Analyze_Renamed_Dereference --
1116 ---------------------------------
1118 procedure Analyze_Renamed_Dereference
1123 Nam
: constant Node_Id
:= Name
(N
);
1124 P
: constant Node_Id
:= Prefix
(Nam
);
1130 if not Is_Overloaded
(P
) then
1131 if Ekind
(Etype
(Nam
)) /= E_Subprogram_Type
1132 or else not Type_Conformant
(Etype
(Nam
), New_S
) then
1133 Error_Msg_N
("designated type does not match specification", P
);
1142 Get_First_Interp
(Nam
, Ind
, It
);
1144 while Present
(It
.Nam
) loop
1146 if Ekind
(It
.Nam
) = E_Subprogram_Type
1147 and then Type_Conformant
(It
.Nam
, New_S
) then
1149 if Typ
/= Any_Id
then
1150 Error_Msg_N
("ambiguous renaming", P
);
1157 Get_Next_Interp
(Ind
, It
);
1160 if Typ
= Any_Type
then
1161 Error_Msg_N
("designated type does not match specification", P
);
1166 Check_Frozen_Renaming
(N
, New_S
);
1170 end Analyze_Renamed_Dereference
;
1172 ---------------------------
1173 -- Analyze_Renamed_Entry --
1174 ---------------------------
1176 procedure Analyze_Renamed_Entry
1181 Nam
: constant Node_Id
:= Name
(N
);
1182 Sel
: constant Node_Id
:= Selector_Name
(Nam
);
1186 if Entity
(Sel
) = Any_Id
then
1188 -- Selector is undefined on prefix. Error emitted already
1190 Set_Has_Completion
(New_S
);
1194 -- Otherwise find renamed entity and build body of New_S as a call to it
1196 Old_S
:= Find_Renamed_Entity
(N
, Selector_Name
(Nam
), New_S
);
1198 if Old_S
= Any_Id
then
1199 Error_Msg_N
(" no subprogram or entry matches specification", N
);
1202 Check_Subtype_Conformant
(New_S
, Old_S
, N
);
1203 Generate_Reference
(New_S
, Defining_Entity
(N
), 'b');
1204 Style
.Check_Identifier
(Defining_Entity
(N
), New_S
);
1207 -- Only mode conformance required for a renaming_as_declaration
1209 Check_Mode_Conformant
(New_S
, Old_S
, N
);
1212 Inherit_Renamed_Profile
(New_S
, Old_S
);
1215 Set_Convention
(New_S
, Convention
(Old_S
));
1216 Set_Has_Completion
(New_S
, Inside_A_Generic
);
1219 Check_Frozen_Renaming
(N
, New_S
);
1221 end Analyze_Renamed_Entry
;
1223 -----------------------------------
1224 -- Analyze_Renamed_Family_Member --
1225 -----------------------------------
1227 procedure Analyze_Renamed_Family_Member
1232 Nam
: constant Node_Id
:= Name
(N
);
1233 P
: constant Node_Id
:= Prefix
(Nam
);
1237 if (Is_Entity_Name
(P
) and then Ekind
(Entity
(P
)) = E_Entry_Family
)
1238 or else (Nkind
(P
) = N_Selected_Component
1240 Ekind
(Entity
(Selector_Name
(P
))) = E_Entry_Family
)
1242 if Is_Entity_Name
(P
) then
1243 Old_S
:= Entity
(P
);
1245 Old_S
:= Entity
(Selector_Name
(P
));
1248 if not Entity_Matches_Spec
(Old_S
, New_S
) then
1249 Error_Msg_N
("entry family does not match specification", N
);
1252 Check_Subtype_Conformant
(New_S
, Old_S
, N
);
1253 Generate_Reference
(New_S
, Defining_Entity
(N
), 'b');
1254 Style
.Check_Identifier
(Defining_Entity
(N
), New_S
);
1258 Error_Msg_N
("no entry family matches specification", N
);
1261 Set_Has_Completion
(New_S
, Inside_A_Generic
);
1264 Check_Frozen_Renaming
(N
, New_S
);
1266 end Analyze_Renamed_Family_Member
;
1268 ---------------------------------
1269 -- Analyze_Subprogram_Renaming --
1270 ---------------------------------
1272 procedure Analyze_Subprogram_Renaming
(N
: Node_Id
) is
1273 Formal_Spec
: constant Node_Id
:= Corresponding_Formal_Spec
(N
);
1274 Is_Actual
: constant Boolean := Present
(Formal_Spec
);
1275 Inst_Node
: Node_Id
:= Empty
;
1276 Nam
: constant Node_Id
:= Name
(N
);
1278 Old_S
: Entity_Id
:= Empty
;
1279 Rename_Spec
: Entity_Id
;
1280 Save_AV
: constant Ada_Version_Type
:= Ada_Version
;
1281 Save_AV_Exp
: constant Ada_Version_Type
:= Ada_Version_Explicit
;
1282 Spec
: constant Node_Id
:= Specification
(N
);
1284 procedure Check_Null_Exclusion
1287 -- Ada 2005 (AI-423): Given renaming Ren of subprogram Sub, check the
1288 -- following AI rules:
1290 -- If Ren is a renaming of a formal subprogram and one of its
1291 -- parameters has a null exclusion, then the corresponding formal
1292 -- in Sub must also have one. Otherwise the subtype of the Sub's
1293 -- formal parameter must exclude null.
1295 -- If Ren is a renaming of a formal function and its retrun
1296 -- profile has a null exclusion, then Sub's return profile must
1297 -- have one. Otherwise the subtype of Sub's return profile must
1300 function Original_Subprogram
(Subp
: Entity_Id
) return Entity_Id
;
1301 -- Find renamed entity when the declaration is a renaming_as_body and
1302 -- the renamed entity may itself be a renaming_as_body. Used to enforce
1303 -- rule that a renaming_as_body is illegal if the declaration occurs
1304 -- before the subprogram it completes is frozen, and renaming indirectly
1305 -- renames the subprogram itself.(Defect Report 8652/0027).
1307 --------------------------
1308 -- Check_Null_Exclusion --
1309 --------------------------
1311 procedure Check_Null_Exclusion
1315 Ren_Formal
: Entity_Id
;
1316 Sub_Formal
: Entity_Id
;
1321 Ren_Formal
:= First_Formal
(Ren
);
1322 Sub_Formal
:= First_Formal
(Sub
);
1323 while Present
(Ren_Formal
)
1324 and then Present
(Sub_Formal
)
1326 if Has_Null_Exclusion
(Parent
(Ren_Formal
))
1328 not (Has_Null_Exclusion
(Parent
(Sub_Formal
))
1329 or else Can_Never_Be_Null
(Etype
(Sub_Formal
)))
1332 ("`NOT NULL` required for parameter &",
1333 Parent
(Sub_Formal
), Sub_Formal
);
1336 Next_Formal
(Ren_Formal
);
1337 Next_Formal
(Sub_Formal
);
1340 -- Return profile check
1342 if Nkind
(Parent
(Ren
)) = N_Function_Specification
1343 and then Nkind
(Parent
(Sub
)) = N_Function_Specification
1344 and then Has_Null_Exclusion
(Parent
(Ren
))
1346 not (Has_Null_Exclusion
(Parent
(Sub
))
1347 or else Can_Never_Be_Null
(Etype
(Sub
)))
1350 ("return must specify `NOT NULL`",
1351 Result_Definition
(Parent
(Sub
)));
1353 end Check_Null_Exclusion
;
1355 -------------------------
1356 -- Original_Subprogram --
1357 -------------------------
1359 function Original_Subprogram
(Subp
: Entity_Id
) return Entity_Id
is
1360 Orig_Decl
: Node_Id
;
1361 Orig_Subp
: Entity_Id
;
1364 -- First case: renamed entity is itself a renaming
1366 if Present
(Alias
(Subp
)) then
1367 return Alias
(Subp
);
1370 Nkind
(Unit_Declaration_Node
(Subp
)) = N_Subprogram_Declaration
1372 (Corresponding_Body
(Unit_Declaration_Node
(Subp
)))
1374 -- Check if renamed entity is a renaming_as_body
1377 Unit_Declaration_Node
1378 (Corresponding_Body
(Unit_Declaration_Node
(Subp
)));
1380 if Nkind
(Orig_Decl
) = N_Subprogram_Renaming_Declaration
then
1381 Orig_Subp
:= Entity
(Name
(Orig_Decl
));
1383 if Orig_Subp
= Rename_Spec
then
1385 -- Circularity detected
1390 return (Original_Subprogram
(Orig_Subp
));
1398 end Original_Subprogram
;
1400 -- Start of processing for Analyze_Subprogram_Renaming
1403 -- We must test for the attribute renaming case before the Analyze
1404 -- call because otherwise Sem_Attr will complain that the attribute
1405 -- is missing an argument when it is analyzed.
1407 if Nkind
(Nam
) = N_Attribute_Reference
then
1409 -- In the case of an abstract formal subprogram association, rewrite
1410 -- an actual given by a stream attribute as the name of the
1411 -- corresponding stream primitive of the type.
1413 -- In a generic context the stream operations are not generated, and
1414 -- this must be treated as a normal attribute reference, to be
1415 -- expanded in subsequent instantiations.
1417 if Is_Actual
and then Is_Abstract_Subprogram
(Formal_Spec
)
1418 and then Expander_Active
1421 Stream_Prim
: Entity_Id
;
1422 Prefix_Type
: constant Entity_Id
:= Entity
(Prefix
(Nam
));
1425 -- The class-wide forms of the stream attributes are not
1426 -- primitive dispatching operations (even though they
1427 -- internally dispatch to a stream attribute).
1429 if Is_Class_Wide_Type
(Prefix_Type
) then
1431 ("attribute must be a primitive dispatching operation",
1436 -- Retrieve the primitive subprogram associated with the
1437 -- attribute. This can only be a stream attribute, since those
1438 -- are the only ones that are dispatching (and the actual for
1439 -- an abstract formal subprogram must be dispatching
1442 case Attribute_Name
(Nam
) is
1445 Find_Prim_Op
(Prefix_Type
, TSS_Stream_Input
);
1448 Find_Prim_Op
(Prefix_Type
, TSS_Stream_Output
);
1451 Find_Prim_Op
(Prefix_Type
, TSS_Stream_Read
);
1454 Find_Prim_Op
(Prefix_Type
, TSS_Stream_Write
);
1457 ("attribute must be a primitive dispatching operation",
1462 -- Rewrite the attribute into the name of its corresponding
1463 -- primitive dispatching subprogram. We can then proceed with
1464 -- the usual processing for subprogram renamings.
1467 Prim_Name
: constant Node_Id
:=
1468 Make_Identifier
(Sloc
(Nam
),
1469 Chars
=> Chars
(Stream_Prim
));
1471 Set_Entity
(Prim_Name
, Stream_Prim
);
1472 Rewrite
(Nam
, Prim_Name
);
1477 -- Normal processing for a renaming of an attribute
1480 Attribute_Renaming
(N
);
1485 -- Check whether this declaration corresponds to the instantiation
1486 -- of a formal subprogram.
1488 -- If this is an instantiation, the corresponding actual is frozen and
1489 -- error messages can be made more precise. If this is a default
1490 -- subprogram, the entity is already established in the generic, and is
1491 -- not retrieved by visibility. If it is a default with a box, the
1492 -- candidate interpretations, if any, have been collected when building
1493 -- the renaming declaration. If overloaded, the proper interpretation is
1494 -- determined in Find_Renamed_Entity. If the entity is an operator,
1495 -- Find_Renamed_Entity applies additional visibility checks.
1498 Inst_Node
:= Unit_Declaration_Node
(Formal_Spec
);
1500 if Is_Entity_Name
(Nam
)
1501 and then Present
(Entity
(Nam
))
1502 and then not Comes_From_Source
(Nam
)
1503 and then not Is_Overloaded
(Nam
)
1505 Old_S
:= Entity
(Nam
);
1506 New_S
:= Analyze_Subprogram_Specification
(Spec
);
1510 if Ekind
(Entity
(Nam
)) = E_Operator
then
1514 if Box_Present
(Inst_Node
) then
1515 Old_S
:= Find_Renamed_Entity
(N
, Name
(N
), New_S
, Is_Actual
);
1517 -- If there is an immediately visible homonym of the operator
1518 -- and the declaration has a default, this is worth a warning
1519 -- because the user probably did not intend to get the pre-
1520 -- defined operator, visible in the generic declaration. To
1521 -- find if there is an intended candidate, analyze the renaming
1522 -- again in the current context.
1524 elsif Scope
(Old_S
) = Standard_Standard
1525 and then Present
(Default_Name
(Inst_Node
))
1528 Decl
: constant Node_Id
:= New_Copy_Tree
(N
);
1532 Set_Entity
(Name
(Decl
), Empty
);
1533 Analyze
(Name
(Decl
));
1535 Find_Renamed_Entity
(Decl
, Name
(Decl
), New_S
, True);
1538 and then In_Open_Scopes
(Scope
(Hidden
))
1539 and then Is_Immediately_Visible
(Hidden
)
1540 and then Comes_From_Source
(Hidden
)
1541 and then Hidden
/= Old_S
1543 Error_Msg_Sloc
:= Sloc
(Hidden
);
1544 Error_Msg_N
("?default subprogram is resolved " &
1545 "in the generic declaration " &
1546 "(RM 12.6(17))", N
);
1547 Error_Msg_NE
("\?and will not use & #", N
, Hidden
);
1555 New_S
:= Analyze_Subprogram_Specification
(Spec
);
1559 -- Renamed entity must be analyzed first, to avoid being hidden by
1560 -- new name (which might be the same in a generic instance).
1564 -- The renaming defines a new overloaded entity, which is analyzed
1565 -- like a subprogram declaration.
1567 New_S
:= Analyze_Subprogram_Specification
(Spec
);
1570 if Current_Scope
/= Standard_Standard
then
1571 Set_Is_Pure
(New_S
, Is_Pure
(Current_Scope
));
1574 Rename_Spec
:= Find_Corresponding_Spec
(N
);
1576 if Present
(Rename_Spec
) then
1578 -- Renaming_As_Body. Renaming declaration is the completion of
1579 -- the declaration of Rename_Spec. We will build an actual body
1580 -- for it at the freezing point.
1582 Set_Corresponding_Spec
(N
, Rename_Spec
);
1584 if Nkind
(Unit_Declaration_Node
(Rename_Spec
)) =
1585 N_Abstract_Subprogram_Declaration
1587 -- Input and Output stream functions are abstract if the object
1588 -- type is abstract. However, these functions may receive explicit
1589 -- declarations in representation clauses, making the attribute
1590 -- subprograms usable as defaults in subsequent type extensions.
1591 -- In this case we rewrite the declaration to make the subprogram
1592 -- non-abstract. We remove the previous declaration, and insert
1593 -- the new one at the point of the renaming, to prevent premature
1594 -- access to unfrozen types. The new declaration reuses the
1595 -- specification of the previous one, and must not be analyzed.
1597 pragma Assert
(Is_TSS
(Rename_Spec
, TSS_Stream_Output
)
1598 or else Is_TSS
(Rename_Spec
, TSS_Stream_Input
));
1601 Old_Decl
: constant Node_Id
:=
1602 Unit_Declaration_Node
(Rename_Spec
);
1603 New_Decl
: constant Node_Id
:=
1604 Make_Subprogram_Declaration
(Sloc
(N
),
1606 Relocate_Node
(Specification
(Old_Decl
)));
1609 Insert_After
(N
, New_Decl
);
1610 Set_Is_Abstract_Subprogram
(Rename_Spec
, False);
1611 Set_Analyzed
(New_Decl
);
1615 Set_Corresponding_Body
(Unit_Declaration_Node
(Rename_Spec
), New_S
);
1617 if Ada_Version
= Ada_83
and then Comes_From_Source
(N
) then
1618 Error_Msg_N
("(Ada 83) renaming cannot serve as a body", N
);
1621 Set_Convention
(New_S
, Convention
(Rename_Spec
));
1622 Check_Fully_Conformant
(New_S
, Rename_Spec
);
1623 Set_Public_Status
(New_S
);
1625 -- Indicate that the entity in the declaration functions like the
1626 -- corresponding body, and is not a new entity. The body will be
1627 -- constructed later at the freeze point, so indicate that the
1628 -- completion has not been seen yet.
1630 Set_Ekind
(New_S
, E_Subprogram_Body
);
1631 New_S
:= Rename_Spec
;
1632 Set_Has_Completion
(Rename_Spec
, False);
1634 -- Ada 2005: check overriding indicator
1636 if Must_Override
(Specification
(N
))
1637 and then not Is_Overriding_Operation
(Rename_Spec
)
1639 Error_Msg_NE
("subprogram& is not overriding", N
, Rename_Spec
);
1641 elsif Must_Not_Override
(Specification
(N
))
1642 and then Is_Overriding_Operation
(Rename_Spec
)
1645 ("subprogram& overrides inherited operation", N
, Rename_Spec
);
1649 Generate_Definition
(New_S
);
1650 New_Overloaded_Entity
(New_S
);
1652 if Is_Entity_Name
(Nam
)
1653 and then Is_Intrinsic_Subprogram
(Entity
(Nam
))
1657 Check_Delayed_Subprogram
(New_S
);
1661 -- There is no need for elaboration checks on the new entity, which may
1662 -- be called before the next freezing point where the body will appear.
1663 -- Elaboration checks refer to the real entity, not the one created by
1664 -- the renaming declaration.
1666 Set_Kill_Elaboration_Checks
(New_S
, True);
1668 if Etype
(Nam
) = Any_Type
then
1669 Set_Has_Completion
(New_S
);
1672 elsif Nkind
(Nam
) = N_Selected_Component
then
1674 -- Renamed entity is an entry or protected subprogram. For those
1675 -- cases an explicit body is built (at the point of freezing of this
1676 -- entity) that contains a call to the renamed entity.
1678 Analyze_Renamed_Entry
(N
, New_S
, Present
(Rename_Spec
));
1681 elsif Nkind
(Nam
) = N_Explicit_Dereference
then
1683 -- Renamed entity is designated by access_to_subprogram expression.
1684 -- Must build body to encapsulate call, as in the entry case.
1686 Analyze_Renamed_Dereference
(N
, New_S
, Present
(Rename_Spec
));
1689 elsif Nkind
(Nam
) = N_Indexed_Component
then
1690 Analyze_Renamed_Family_Member
(N
, New_S
, Present
(Rename_Spec
));
1693 elsif Nkind
(Nam
) = N_Character_Literal
then
1694 Analyze_Renamed_Character
(N
, New_S
, Present
(Rename_Spec
));
1697 elsif (not Is_Entity_Name
(Nam
)
1698 and then Nkind
(Nam
) /= N_Operator_Symbol
)
1699 or else not Is_Overloadable
(Entity
(Nam
))
1701 Error_Msg_N
("expect valid subprogram name in renaming", N
);
1705 -- Find the renamed entity that matches the given specification. Disable
1706 -- Ada_83 because there is no requirement of full conformance between
1707 -- renamed entity and new entity, even though the same circuit is used.
1709 -- This is a bit of a kludge, which introduces a really irregular use of
1710 -- Ada_Version[_Explicit]. Would be nice to find cleaner way to do this
1713 Ada_Version
:= Ada_Version_Type
'Max (Ada_Version
, Ada_95
);
1714 Ada_Version_Explicit
:= Ada_Version
;
1717 Old_S
:= Find_Renamed_Entity
(N
, Name
(N
), New_S
, Is_Actual
);
1719 -- When the renamed subprogram is overloaded and used as an actual
1720 -- of a generic, its entity is set to the first available homonym.
1721 -- We must first disambiguate the name, then set the proper entity.
1724 and then Is_Overloaded
(Nam
)
1726 Set_Entity
(Nam
, Old_S
);
1730 -- Most common case: subprogram renames subprogram. No body is generated
1731 -- in this case, so we must indicate the declaration is complete as is.
1733 if No
(Rename_Spec
) then
1734 Set_Has_Completion
(New_S
);
1735 Set_Is_Pure
(New_S
, Is_Pure
(Entity
(Nam
)));
1736 Set_Is_Preelaborated
(New_S
, Is_Preelaborated
(Entity
(Nam
)));
1738 -- Ada 2005 (AI-423): Check the consistency of null exclusions
1739 -- between a subprogram and its correct renaming.
1741 -- Note: the Any_Id check is a guard that prevents compiler crashes
1742 -- when performing a null exclusion check between a renaming and a
1743 -- renamed subprogram that has been found to be illegal.
1745 if Ada_Version
>= Ada_05
1746 and then Entity
(Nam
) /= Any_Id
1748 Check_Null_Exclusion
1750 Sub
=> Entity
(Nam
));
1754 if Old_S
/= Any_Id
then
1756 and then From_Default
(N
)
1758 -- This is an implicit reference to the default actual
1760 Generate_Reference
(Old_S
, Nam
, Typ
=> 'i', Force
=> True);
1762 Generate_Reference
(Old_S
, Nam
);
1765 -- For a renaming-as-body, require subtype conformance, but if the
1766 -- declaration being completed has not been frozen, then inherit the
1767 -- convention of the renamed subprogram prior to checking conformance
1768 -- (unless the renaming has an explicit convention established; the
1769 -- rule stated in the RM doesn't seem to address this ???).
1771 if Present
(Rename_Spec
) then
1772 Generate_Reference
(Rename_Spec
, Defining_Entity
(Spec
), 'b');
1773 Style
.Check_Identifier
(Defining_Entity
(Spec
), Rename_Spec
);
1775 if not Is_Frozen
(Rename_Spec
) then
1776 if not Has_Convention_Pragma
(Rename_Spec
) then
1777 Set_Convention
(New_S
, Convention
(Old_S
));
1780 if Ekind
(Old_S
) /= E_Operator
then
1781 Check_Mode_Conformant
(New_S
, Old_S
, Spec
);
1784 if Original_Subprogram
(Old_S
) = Rename_Spec
then
1785 Error_Msg_N
("unfrozen subprogram cannot rename itself ", N
);
1788 Check_Subtype_Conformant
(New_S
, Old_S
, Spec
);
1791 Check_Frozen_Renaming
(N
, Rename_Spec
);
1793 -- Check explicitly that renamed entity is not intrinsic, because
1794 -- in in a generic the renamed body is not built. In this case,
1795 -- the renaming_as_body is a completion.
1797 if Inside_A_Generic
then
1798 if Is_Frozen
(Rename_Spec
)
1799 and then Is_Intrinsic_Subprogram
(Old_S
)
1802 ("subprogram in renaming_as_body cannot be intrinsic",
1806 Set_Has_Completion
(Rename_Spec
);
1809 elsif Ekind
(Old_S
) /= E_Operator
then
1810 Check_Mode_Conformant
(New_S
, Old_S
);
1813 and then Error_Posted
(New_S
)
1815 Error_Msg_NE
("invalid actual subprogram: & #!", N
, Old_S
);
1819 if No
(Rename_Spec
) then
1821 -- The parameter profile of the new entity is that of the renamed
1822 -- entity: the subtypes given in the specification are irrelevant.
1824 Inherit_Renamed_Profile
(New_S
, Old_S
);
1826 -- A call to the subprogram is transformed into a call to the
1827 -- renamed entity. This is transitive if the renamed entity is
1828 -- itself a renaming.
1830 if Present
(Alias
(Old_S
)) then
1831 Set_Alias
(New_S
, Alias
(Old_S
));
1833 Set_Alias
(New_S
, Old_S
);
1836 -- Note that we do not set Is_Intrinsic_Subprogram if we have a
1837 -- renaming as body, since the entity in this case is not an
1838 -- intrinsic (it calls an intrinsic, but we have a real body for
1839 -- this call, and it is in this body that the required intrinsic
1840 -- processing will take place).
1842 -- Also, if this is a renaming of inequality, the renamed operator
1843 -- is intrinsic, but what matters is the corresponding equality
1844 -- operator, which may be user-defined.
1846 Set_Is_Intrinsic_Subprogram
1848 Is_Intrinsic_Subprogram
(Old_S
)
1850 (Chars
(Old_S
) /= Name_Op_Ne
1851 or else Ekind
(Old_S
) = E_Operator
1853 Is_Intrinsic_Subprogram
1854 (Corresponding_Equality
(Old_S
))));
1856 if Ekind
(Alias
(New_S
)) = E_Operator
then
1857 Set_Has_Delayed_Freeze
(New_S
, False);
1860 -- If the renaming corresponds to an association for an abstract
1861 -- formal subprogram, then various attributes must be set to
1862 -- indicate that the renaming is an abstract dispatching operation
1863 -- with a controlling type.
1865 if Is_Actual
and then Is_Abstract_Subprogram
(Formal_Spec
) then
1867 -- Mark the renaming as abstract here, so Find_Dispatching_Type
1868 -- see it as corresponding to a generic association for a
1869 -- formal abstract subprogram
1871 Set_Is_Abstract_Subprogram
(New_S
);
1874 New_S_Ctrl_Type
: constant Entity_Id
:=
1875 Find_Dispatching_Type
(New_S
);
1876 Old_S_Ctrl_Type
: constant Entity_Id
:=
1877 Find_Dispatching_Type
(Old_S
);
1880 if Old_S_Ctrl_Type
/= New_S_Ctrl_Type
then
1882 ("actual must be dispatching subprogram for type&",
1883 Nam
, New_S_Ctrl_Type
);
1886 Set_Is_Dispatching_Operation
(New_S
);
1887 Check_Controlling_Formals
(New_S_Ctrl_Type
, New_S
);
1889 -- If the actual in the formal subprogram is itself a
1890 -- formal abstract subprogram association, there's no
1891 -- dispatch table component or position to inherit.
1893 if Present
(DTC_Entity
(Old_S
)) then
1894 Set_DTC_Entity
(New_S
, DTC_Entity
(Old_S
));
1895 Set_DT_Position
(New_S
, DT_Position
(Old_S
));
1903 and then (Old_S
= New_S
1904 or else (Nkind
(Nam
) /= N_Expanded_Name
1905 and then Chars
(Old_S
) = Chars
(New_S
)))
1907 Error_Msg_N
("subprogram cannot rename itself", N
);
1910 Set_Convention
(New_S
, Convention
(Old_S
));
1912 if Is_Abstract_Subprogram
(Old_S
) then
1913 if Present
(Rename_Spec
) then
1915 ("a renaming-as-body cannot rename an abstract subprogram",
1917 Set_Has_Completion
(Rename_Spec
);
1919 Set_Is_Abstract_Subprogram
(New_S
);
1923 Check_Library_Unit_Renaming
(N
, Old_S
);
1925 -- Pathological case: procedure renames entry in the scope of its
1926 -- task. Entry is given by simple name, but body must be built for
1927 -- procedure. Of course if called it will deadlock.
1929 if Ekind
(Old_S
) = E_Entry
then
1930 Set_Has_Completion
(New_S
, False);
1931 Set_Alias
(New_S
, Empty
);
1935 Freeze_Before
(N
, Old_S
);
1936 Set_Has_Delayed_Freeze
(New_S
, False);
1937 Freeze_Before
(N
, New_S
);
1939 -- An abstract subprogram is only allowed as an actual in the case
1940 -- where the formal subprogram is also abstract.
1942 if (Ekind
(Old_S
) = E_Procedure
or else Ekind
(Old_S
) = E_Function
)
1943 and then Is_Abstract_Subprogram
(Old_S
)
1944 and then not Is_Abstract_Subprogram
(Formal_Spec
)
1947 ("abstract subprogram not allowed as generic actual", Nam
);
1952 -- A common error is to assume that implicit operators for types are
1953 -- defined in Standard, or in the scope of a subtype. In those cases
1954 -- where the renamed entity is given with an expanded name, it is
1955 -- worth mentioning that operators for the type are not declared in
1956 -- the scope given by the prefix.
1958 if Nkind
(Nam
) = N_Expanded_Name
1959 and then Nkind
(Selector_Name
(Nam
)) = N_Operator_Symbol
1960 and then Scope
(Entity
(Nam
)) = Standard_Standard
1963 T
: constant Entity_Id
:=
1964 Base_Type
(Etype
(First_Formal
(New_S
)));
1966 Error_Msg_Node_2
:= Prefix
(Nam
);
1968 ("operator for type& is not declared in&", Prefix
(Nam
), T
);
1973 ("no visible subprogram matches the specification for&",
1977 if Present
(Candidate_Renaming
) then
1983 F1
:= First_Formal
(Candidate_Renaming
);
1984 F2
:= First_Formal
(New_S
);
1986 while Present
(F1
) and then Present
(F2
) loop
1991 if Present
(F1
) and then Present
(Default_Value
(F1
)) then
1992 if Present
(Next_Formal
(F1
)) then
1994 ("\missing specification for &" &
1995 " and other formals with defaults", Spec
, F1
);
1998 ("\missing specification for &", Spec
, F1
);
2005 -- Ada 2005 AI 404: if the new subprogram is dispatching, verify that
2006 -- controlling access parameters are known non-null for the renamed
2007 -- subprogram. Test also applies to a subprogram instantiation that
2008 -- is dispatching. Test is skipped if some previous error was detected
2009 -- that set Old_S to Any_Id.
2011 if Ada_Version
>= Ada_05
2012 and then Old_S
/= Any_Id
2013 and then not Is_Dispatching_Operation
(Old_S
)
2014 and then Is_Dispatching_Operation
(New_S
)
2021 Old_F
:= First_Formal
(Old_S
);
2022 New_F
:= First_Formal
(New_S
);
2023 while Present
(Old_F
) loop
2024 if Ekind
(Etype
(Old_F
)) = E_Anonymous_Access_Type
2025 and then Is_Controlling_Formal
(New_F
)
2026 and then not Can_Never_Be_Null
(Old_F
)
2028 Error_Msg_N
("access parameter is controlling,", New_F
);
2030 ("\corresponding parameter of& "
2031 & "must be explicitly null excluding", New_F
, Old_S
);
2034 Next_Formal
(Old_F
);
2035 Next_Formal
(New_F
);
2040 -- A useful warning, suggested by Ada Bug Finder (Ada-Europe 2005)
2042 if Comes_From_Source
(N
)
2043 and then Present
(Old_S
)
2044 and then Nkind
(Old_S
) = N_Defining_Operator_Symbol
2045 and then Nkind
(New_S
) = N_Defining_Operator_Symbol
2046 and then Chars
(Old_S
) /= Chars
(New_S
)
2049 ("?& is being renamed as a different operator",
2053 -- Another warning or some utility: if the new subprogram as the same
2054 -- name as the old one, the old one is not hidden by an outer homograph,
2055 -- the new one is not a public symbol, and the old one is otherwise
2056 -- directly visible, the renaming is superfluous.
2058 if Chars
(Old_S
) = Chars
(New_S
)
2059 and then Comes_From_Source
(N
)
2060 and then Scope
(Old_S
) /= Standard_Standard
2061 and then Warn_On_Redundant_Constructs
2063 (Is_Immediately_Visible
(Old_S
)
2064 or else Is_Potentially_Use_Visible
(Old_S
))
2065 and then Is_Overloadable
(Current_Scope
)
2066 and then Chars
(Current_Scope
) /= Chars
(Old_S
)
2069 ("?redundant renaming, entity is directly visible", Name
(N
));
2072 Ada_Version
:= Save_AV
;
2073 Ada_Version_Explicit
:= Save_AV_Exp
;
2074 end Analyze_Subprogram_Renaming
;
2076 -------------------------
2077 -- Analyze_Use_Package --
2078 -------------------------
2080 -- Resolve the package names in the use clause, and make all the visible
2081 -- entities defined in the package potentially use-visible. If the package
2082 -- is already in use from a previous use clause, its visible entities are
2083 -- already use-visible. In that case, mark the occurrence as a redundant
2084 -- use. If the package is an open scope, i.e. if the use clause occurs
2085 -- within the package itself, ignore it.
2087 procedure Analyze_Use_Package
(N
: Node_Id
) is
2088 Pack_Name
: Node_Id
;
2091 -- Start of processing for Analyze_Use_Package
2094 Set_Hidden_By_Use_Clause
(N
, No_Elist
);
2096 -- Use clause is not allowed in a spec of a predefined package
2097 -- declaration except that packages whose file name starts a-n are OK
2098 -- (these are children of Ada.Numerics, and such packages are never
2099 -- loaded by Rtsfind).
2101 if Is_Predefined_File_Name
(Unit_File_Name
(Current_Sem_Unit
))
2102 and then Name_Buffer
(1 .. 3) /= "a-n"
2104 Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Declaration
2106 Error_Msg_N
("use clause not allowed in predefined spec", N
);
2109 -- Chain clause to list of use clauses in current scope
2111 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
2112 Chain_Use_Clause
(N
);
2115 -- Loop through package names to identify referenced packages
2117 Pack_Name
:= First
(Names
(N
));
2118 while Present
(Pack_Name
) loop
2119 Analyze
(Pack_Name
);
2121 if Nkind
(Parent
(N
)) = N_Compilation_Unit
2122 and then Nkind
(Pack_Name
) = N_Expanded_Name
2128 Pref
:= Prefix
(Pack_Name
);
2129 while Nkind
(Pref
) = N_Expanded_Name
loop
2130 Pref
:= Prefix
(Pref
);
2133 if Entity
(Pref
) = Standard_Standard
then
2135 ("predefined package Standard cannot appear"
2136 & " in a context clause", Pref
);
2144 -- Loop through package names to mark all entities as potentially
2147 Pack_Name
:= First
(Names
(N
));
2148 while Present
(Pack_Name
) loop
2149 if Is_Entity_Name
(Pack_Name
) then
2150 Pack
:= Entity
(Pack_Name
);
2152 if Ekind
(Pack
) /= E_Package
2153 and then Etype
(Pack
) /= Any_Type
2155 if Ekind
(Pack
) = E_Generic_Package
then
2157 ("a generic package is not allowed in a use clause",
2160 Error_Msg_N
("& is not a usable package", Pack_Name
);
2164 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2165 Check_In_Previous_With_Clause
(N
, Pack_Name
);
2168 if Applicable_Use
(Pack_Name
) then
2169 Use_One_Package
(Pack
, N
);
2176 end Analyze_Use_Package
;
2178 ----------------------
2179 -- Analyze_Use_Type --
2180 ----------------------
2182 procedure Analyze_Use_Type
(N
: Node_Id
) is
2187 Set_Hidden_By_Use_Clause
(N
, No_Elist
);
2189 -- Chain clause to list of use clauses in current scope
2191 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
2192 Chain_Use_Clause
(N
);
2195 Id
:= First
(Subtype_Marks
(N
));
2196 while Present
(Id
) loop
2200 if E
/= Any_Type
then
2203 if Nkind
(Parent
(N
)) = N_Compilation_Unit
then
2204 if Nkind
(Id
) = N_Identifier
then
2205 Error_Msg_N
("type is not directly visible", Id
);
2207 elsif Is_Child_Unit
(Scope
(E
))
2208 and then Scope
(E
) /= System_Aux_Id
2210 Check_In_Previous_With_Clause
(N
, Prefix
(Id
));
2217 end Analyze_Use_Type
;
2219 --------------------
2220 -- Applicable_Use --
2221 --------------------
2223 function Applicable_Use
(Pack_Name
: Node_Id
) return Boolean is
2224 Pack
: constant Entity_Id
:= Entity
(Pack_Name
);
2227 if In_Open_Scopes
(Pack
) then
2228 if Warn_On_Redundant_Constructs
2229 and then Pack
= Current_Scope
2232 ("& is already use-visible within itself?", Pack_Name
, Pack
);
2237 elsif In_Use
(Pack
) then
2238 Note_Redundant_Use
(Pack_Name
);
2241 elsif Present
(Renamed_Object
(Pack
))
2242 and then In_Use
(Renamed_Object
(Pack
))
2244 Note_Redundant_Use
(Pack_Name
);
2252 ------------------------
2253 -- Attribute_Renaming --
2254 ------------------------
2256 procedure Attribute_Renaming
(N
: Node_Id
) is
2257 Loc
: constant Source_Ptr
:= Sloc
(N
);
2258 Nam
: constant Node_Id
:= Name
(N
);
2259 Spec
: constant Node_Id
:= Specification
(N
);
2260 New_S
: constant Entity_Id
:= Defining_Unit_Name
(Spec
);
2261 Aname
: constant Name_Id
:= Attribute_Name
(Nam
);
2263 Form_Num
: Nat
:= 0;
2264 Expr_List
: List_Id
:= No_List
;
2266 Attr_Node
: Node_Id
;
2267 Body_Node
: Node_Id
;
2268 Param_Spec
: Node_Id
;
2271 Generate_Definition
(New_S
);
2273 -- This procedure is called in the context of subprogram renaming,
2274 -- and thus the attribute must be one that is a subprogram. All of
2275 -- those have at least one formal parameter, with the singular
2276 -- exception of AST_Entry (which is a real oddity, it is odd that
2277 -- this can be renamed at all!)
2279 if not Is_Non_Empty_List
(Parameter_Specifications
(Spec
)) then
2280 if Aname
/= Name_AST_Entry
then
2282 ("subprogram renaming an attribute must have formals", N
);
2287 Param_Spec
:= First
(Parameter_Specifications
(Spec
));
2288 while Present
(Param_Spec
) loop
2289 Form_Num
:= Form_Num
+ 1;
2291 if Nkind
(Parameter_Type
(Param_Spec
)) /= N_Access_Definition
then
2292 Find_Type
(Parameter_Type
(Param_Spec
));
2294 -- The profile of the new entity denotes the base type (s) of
2295 -- the types given in the specification. For access parameters
2296 -- there are no subtypes involved.
2298 Rewrite
(Parameter_Type
(Param_Spec
),
2300 (Base_Type
(Entity
(Parameter_Type
(Param_Spec
))), Loc
));
2303 if No
(Expr_List
) then
2304 Expr_List
:= New_List
;
2307 Append_To
(Expr_List
,
2308 Make_Identifier
(Loc
,
2309 Chars
=> Chars
(Defining_Identifier
(Param_Spec
))));
2311 -- The expressions in the attribute reference are not freeze
2312 -- points. Neither is the attribute as a whole, see below.
2314 Set_Must_Not_Freeze
(Last
(Expr_List
));
2319 -- Immediate error if too many formals. Other mismatches in numbers
2320 -- of number of types of parameters are detected when we analyze the
2321 -- body of the subprogram that we construct.
2323 if Form_Num
> 2 then
2324 Error_Msg_N
("too many formals for attribute", N
);
2326 -- Error if the attribute reference has expressions that look
2327 -- like formal parameters.
2329 elsif Present
(Expressions
(Nam
)) then
2330 Error_Msg_N
("illegal expressions in attribute reference", Nam
);
2333 Aname
= Name_Compose
or else
2334 Aname
= Name_Exponent
or else
2335 Aname
= Name_Leading_Part
or else
2336 Aname
= Name_Pos
or else
2337 Aname
= Name_Round
or else
2338 Aname
= Name_Scaling
or else
2341 if Nkind
(N
) = N_Subprogram_Renaming_Declaration
2342 and then Present
(Corresponding_Formal_Spec
(N
))
2345 ("generic actual cannot be attribute involving universal type",
2349 ("attribute involving a universal type cannot be renamed",
2354 -- AST_Entry is an odd case. It doesn't really make much sense to
2355 -- allow it to be renamed, but that's the DEC rule, so we have to
2356 -- do it right. The point is that the AST_Entry call should be made
2357 -- now, and what the function will return is the returned value.
2359 -- Note that there is no Expr_List in this case anyway
2361 if Aname
= Name_AST_Entry
then
2367 Ent
:= Make_Defining_Identifier
(Loc
, New_Internal_Name
('R'));
2370 Make_Object_Declaration
(Loc
,
2371 Defining_Identifier
=> Ent
,
2372 Object_Definition
=>
2373 New_Occurrence_Of
(RTE
(RE_AST_Handler
), Loc
),
2375 Constant_Present
=> True);
2377 Set_Assignment_OK
(Decl
, True);
2378 Insert_Action
(N
, Decl
);
2379 Attr_Node
:= Make_Identifier
(Loc
, Chars
(Ent
));
2382 -- For all other attributes, we rewrite the attribute node to have
2383 -- a list of expressions corresponding to the subprogram formals.
2384 -- A renaming declaration is not a freeze point, and the analysis of
2385 -- the attribute reference should not freeze the type of the prefix.
2389 Make_Attribute_Reference
(Loc
,
2390 Prefix
=> Prefix
(Nam
),
2391 Attribute_Name
=> Aname
,
2392 Expressions
=> Expr_List
);
2394 Set_Must_Not_Freeze
(Attr_Node
);
2395 Set_Must_Not_Freeze
(Prefix
(Nam
));
2398 -- Case of renaming a function
2400 if Nkind
(Spec
) = N_Function_Specification
then
2401 if Is_Procedure_Attribute_Name
(Aname
) then
2402 Error_Msg_N
("attribute can only be renamed as procedure", Nam
);
2406 Find_Type
(Result_Definition
(Spec
));
2407 Rewrite
(Result_Definition
(Spec
),
2409 Base_Type
(Entity
(Result_Definition
(Spec
))), Loc
));
2412 Make_Subprogram_Body
(Loc
,
2413 Specification
=> Spec
,
2414 Declarations
=> New_List
,
2415 Handled_Statement_Sequence
=>
2416 Make_Handled_Sequence_Of_Statements
(Loc
,
2417 Statements
=> New_List
(
2418 Make_Simple_Return_Statement
(Loc
,
2419 Expression
=> Attr_Node
))));
2421 -- Case of renaming a procedure
2424 if not Is_Procedure_Attribute_Name
(Aname
) then
2425 Error_Msg_N
("attribute can only be renamed as function", Nam
);
2430 Make_Subprogram_Body
(Loc
,
2431 Specification
=> Spec
,
2432 Declarations
=> New_List
,
2433 Handled_Statement_Sequence
=>
2434 Make_Handled_Sequence_Of_Statements
(Loc
,
2435 Statements
=> New_List
(Attr_Node
)));
2438 -- In case of tagged types we add the body of the generated function to
2439 -- the freezing actions of the type (because in the general case such
2440 -- type is still not frozen). We exclude from this processing generic
2441 -- formal subprograms found in instantiations and AST_Entry renamings.
2443 if not Present
(Corresponding_Formal_Spec
(N
))
2444 and then Etype
(Nam
) /= RTE
(RE_AST_Handler
)
2447 P
: constant Entity_Id
:= Prefix
(Nam
);
2452 if Is_Tagged_Type
(Etype
(P
)) then
2453 Ensure_Freeze_Node
(Etype
(P
));
2454 Append_Freeze_Action
(Etype
(P
), Body_Node
);
2456 Rewrite
(N
, Body_Node
);
2458 Set_Etype
(New_S
, Base_Type
(Etype
(New_S
)));
2462 -- Generic formal subprograms or AST_Handler renaming
2465 Rewrite
(N
, Body_Node
);
2467 Set_Etype
(New_S
, Base_Type
(Etype
(New_S
)));
2470 if Is_Compilation_Unit
(New_S
) then
2472 ("a library unit can only rename another library unit", N
);
2475 -- We suppress elaboration warnings for the resulting entity, since
2476 -- clearly they are not needed, and more particularly, in the case
2477 -- of a generic formal subprogram, the resulting entity can appear
2478 -- after the instantiation itself, and thus look like a bogus case
2479 -- of access before elaboration.
2481 Set_Suppress_Elaboration_Warnings
(New_S
);
2483 end Attribute_Renaming
;
2485 ----------------------
2486 -- Chain_Use_Clause --
2487 ----------------------
2489 procedure Chain_Use_Clause
(N
: Node_Id
) is
2491 Level
: Int
:= Scope_Stack
.Last
;
2494 if not Is_Compilation_Unit
(Current_Scope
)
2495 or else not Is_Child_Unit
(Current_Scope
)
2497 null; -- Common case
2499 elsif Defining_Entity
(Parent
(N
)) = Current_Scope
then
2500 null; -- Common case for compilation unit
2503 -- If declaration appears in some other scope, it must be in some
2504 -- parent unit when compiling a child.
2506 Pack
:= Defining_Entity
(Parent
(N
));
2507 if not In_Open_Scopes
(Pack
) then
2508 null; -- default as well
2511 -- Find entry for parent unit in scope stack
2513 while Scope_Stack
.Table
(Level
).Entity
/= Pack
loop
2519 Set_Next_Use_Clause
(N
,
2520 Scope_Stack
.Table
(Level
).First_Use_Clause
);
2521 Scope_Stack
.Table
(Level
).First_Use_Clause
:= N
;
2522 end Chain_Use_Clause
;
2524 ---------------------------
2525 -- Check_Frozen_Renaming --
2526 ---------------------------
2528 procedure Check_Frozen_Renaming
(N
: Node_Id
; Subp
: Entity_Id
) is
2534 and then not Has_Completion
(Subp
)
2538 (Parent
(Declaration_Node
(Subp
)), Defining_Entity
(N
));
2540 if Is_Entity_Name
(Name
(N
)) then
2541 Old_S
:= Entity
(Name
(N
));
2543 if not Is_Frozen
(Old_S
)
2544 and then Operating_Mode
/= Check_Semantics
2546 Append_Freeze_Action
(Old_S
, B_Node
);
2548 Insert_After
(N
, B_Node
);
2552 if Is_Intrinsic_Subprogram
(Old_S
)
2553 and then not In_Instance
2556 ("subprogram used in renaming_as_body cannot be intrinsic",
2561 Insert_After
(N
, B_Node
);
2565 end Check_Frozen_Renaming
;
2567 -----------------------------------
2568 -- Check_In_Previous_With_Clause --
2569 -----------------------------------
2571 procedure Check_In_Previous_With_Clause
2575 Pack
: constant Entity_Id
:= Entity
(Original_Node
(Nam
));
2580 Item
:= First
(Context_Items
(Parent
(N
)));
2582 while Present
(Item
)
2585 if Nkind
(Item
) = N_With_Clause
2587 -- Protect the frontend against previous critical errors
2589 and then Nkind
(Name
(Item
)) /= N_Selected_Component
2590 and then Entity
(Name
(Item
)) = Pack
2594 -- Find root library unit in with_clause
2596 while Nkind
(Par
) = N_Expanded_Name
loop
2597 Par
:= Prefix
(Par
);
2600 if Is_Child_Unit
(Entity
(Original_Node
(Par
))) then
2602 ("& is not directly visible", Par
, Entity
(Par
));
2611 -- On exit, package is not mentioned in a previous with_clause.
2612 -- Check if its prefix is.
2614 if Nkind
(Nam
) = N_Expanded_Name
then
2615 Check_In_Previous_With_Clause
(N
, Prefix
(Nam
));
2617 elsif Pack
/= Any_Id
then
2618 Error_Msg_NE
("& is not visible", Nam
, Pack
);
2620 end Check_In_Previous_With_Clause
;
2622 ---------------------------------
2623 -- Check_Library_Unit_Renaming --
2624 ---------------------------------
2626 procedure Check_Library_Unit_Renaming
(N
: Node_Id
; Old_E
: Entity_Id
) is
2630 if Nkind
(Parent
(N
)) /= N_Compilation_Unit
then
2633 -- Check for library unit. Note that we used to check for the scope
2634 -- being Standard here, but that was wrong for Standard itself.
2636 elsif not Is_Compilation_Unit
(Old_E
)
2637 and then not Is_Child_Unit
(Old_E
)
2639 Error_Msg_N
("renamed unit must be a library unit", Name
(N
));
2641 -- Entities defined in Standard (operators and boolean literals) cannot
2642 -- be renamed as library units.
2644 elsif Scope
(Old_E
) = Standard_Standard
2645 and then Sloc
(Old_E
) = Standard_Location
2647 Error_Msg_N
("renamed unit must be a library unit", Name
(N
));
2649 elsif Present
(Parent_Spec
(N
))
2650 and then Nkind
(Unit
(Parent_Spec
(N
))) = N_Generic_Package_Declaration
2651 and then not Is_Child_Unit
(Old_E
)
2654 ("renamed unit must be a child unit of generic parent", Name
(N
));
2656 elsif Nkind
(N
) in N_Generic_Renaming_Declaration
2657 and then Nkind
(Name
(N
)) = N_Expanded_Name
2658 and then Is_Generic_Instance
(Entity
(Prefix
(Name
(N
))))
2659 and then Is_Generic_Unit
(Old_E
)
2662 ("renamed generic unit must be a library unit", Name
(N
));
2664 elsif Ekind
(Old_E
) = E_Package
2665 or else Ekind
(Old_E
) = E_Generic_Package
2667 -- Inherit categorization flags
2669 New_E
:= Defining_Entity
(N
);
2670 Set_Is_Pure
(New_E
, Is_Pure
(Old_E
));
2671 Set_Is_Preelaborated
(New_E
, Is_Preelaborated
(Old_E
));
2672 Set_Is_Remote_Call_Interface
(New_E
,
2673 Is_Remote_Call_Interface
(Old_E
));
2674 Set_Is_Remote_Types
(New_E
, Is_Remote_Types
(Old_E
));
2675 Set_Is_Shared_Passive
(New_E
, Is_Shared_Passive
(Old_E
));
2677 end Check_Library_Unit_Renaming
;
2683 procedure End_Scope
is
2689 Id
:= First_Entity
(Current_Scope
);
2690 while Present
(Id
) loop
2691 -- An entity in the current scope is not necessarily the first one
2692 -- on its homonym chain. Find its predecessor if any,
2693 -- If it is an internal entity, it will not be in the visibility
2694 -- chain altogether, and there is nothing to unchain.
2696 if Id
/= Current_Entity
(Id
) then
2697 Prev
:= Current_Entity
(Id
);
2698 while Present
(Prev
)
2699 and then Present
(Homonym
(Prev
))
2700 and then Homonym
(Prev
) /= Id
2702 Prev
:= Homonym
(Prev
);
2705 -- Skip to end of loop if Id is not in the visibility chain
2707 if No
(Prev
) or else Homonym
(Prev
) /= Id
then
2715 Set_Is_Immediately_Visible
(Id
, False);
2717 Outer
:= Homonym
(Id
);
2718 while Present
(Outer
) and then Scope
(Outer
) = Current_Scope
loop
2719 Outer
:= Homonym
(Outer
);
2722 -- Reset homonym link of other entities, but do not modify link
2723 -- between entities in current scope, so that the back-end can have
2724 -- a proper count of local overloadings.
2727 Set_Name_Entity_Id
(Chars
(Id
), Outer
);
2729 elsif Scope
(Prev
) /= Scope
(Id
) then
2730 Set_Homonym
(Prev
, Outer
);
2737 -- If the scope generated freeze actions, place them before the
2738 -- current declaration and analyze them. Type declarations and
2739 -- the bodies of initialization procedures can generate such nodes.
2740 -- We follow the parent chain until we reach a list node, which is
2741 -- the enclosing list of declarations. If the list appears within
2742 -- a protected definition, move freeze nodes outside the protected
2746 (Scope_Stack
.Table
(Scope_Stack
.Last
).Pending_Freeze_Actions
)
2750 L
: constant List_Id
:= Scope_Stack
.Table
2751 (Scope_Stack
.Last
).Pending_Freeze_Actions
;
2754 if Is_Itype
(Current_Scope
) then
2755 Decl
:= Associated_Node_For_Itype
(Current_Scope
);
2757 Decl
:= Parent
(Current_Scope
);
2762 while not (Is_List_Member
(Decl
))
2763 or else Nkind
(Parent
(Decl
)) = N_Protected_Definition
2764 or else Nkind
(Parent
(Decl
)) = N_Task_Definition
2766 Decl
:= Parent
(Decl
);
2769 Insert_List_Before_And_Analyze
(Decl
, L
);
2778 ---------------------
2779 -- End_Use_Clauses --
2780 ---------------------
2782 procedure End_Use_Clauses
(Clause
: Node_Id
) is
2786 -- Remove Use_Type clauses first, because they affect the
2787 -- visibility of operators in subsequent used packages.
2790 while Present
(U
) loop
2791 if Nkind
(U
) = N_Use_Type_Clause
then
2795 Next_Use_Clause
(U
);
2799 while Present
(U
) loop
2800 if Nkind
(U
) = N_Use_Package_Clause
then
2801 End_Use_Package
(U
);
2804 Next_Use_Clause
(U
);
2806 end End_Use_Clauses
;
2808 ---------------------
2809 -- End_Use_Package --
2810 ---------------------
2812 procedure End_Use_Package
(N
: Node_Id
) is
2813 Pack_Name
: Node_Id
;
2818 function Is_Primitive_Operator
2820 F
: Entity_Id
) return Boolean;
2821 -- Check whether Op is a primitive operator of a use-visible type
2823 ---------------------------
2824 -- Is_Primitive_Operator --
2825 ---------------------------
2827 function Is_Primitive_Operator
2829 F
: Entity_Id
) return Boolean
2831 T
: constant Entity_Id
:= Etype
(F
);
2834 and then Scope
(T
) = Scope
(Op
);
2835 end Is_Primitive_Operator
;
2837 -- Start of processing for End_Use_Package
2840 Pack_Name
:= First
(Names
(N
));
2841 while Present
(Pack_Name
) loop
2842 Pack
:= Entity
(Pack_Name
);
2844 if Ekind
(Pack
) = E_Package
then
2845 if In_Open_Scopes
(Pack
) then
2848 elsif not Redundant_Use
(Pack_Name
) then
2849 Set_In_Use
(Pack
, False);
2850 Set_Current_Use_Clause
(Pack
, Empty
);
2852 Id
:= First_Entity
(Pack
);
2853 while Present
(Id
) loop
2855 -- Preserve use-visibility of operators that are primitive
2856 -- operators of a type that is use-visible through an active
2859 if Nkind
(Id
) = N_Defining_Operator_Symbol
2861 (Is_Primitive_Operator
(Id
, First_Formal
(Id
))
2863 (Present
(Next_Formal
(First_Formal
(Id
)))
2865 Is_Primitive_Operator
2866 (Id
, Next_Formal
(First_Formal
(Id
)))))
2871 Set_Is_Potentially_Use_Visible
(Id
, False);
2874 if Is_Private_Type
(Id
)
2875 and then Present
(Full_View
(Id
))
2877 Set_Is_Potentially_Use_Visible
(Full_View
(Id
), False);
2883 if Present
(Renamed_Object
(Pack
)) then
2884 Set_In_Use
(Renamed_Object
(Pack
), False);
2885 Set_Current_Use_Clause
(Renamed_Object
(Pack
), Empty
);
2888 if Chars
(Pack
) = Name_System
2889 and then Scope
(Pack
) = Standard_Standard
2890 and then Present_System_Aux
2892 Id
:= First_Entity
(System_Aux_Id
);
2893 while Present
(Id
) loop
2894 Set_Is_Potentially_Use_Visible
(Id
, False);
2896 if Is_Private_Type
(Id
)
2897 and then Present
(Full_View
(Id
))
2899 Set_Is_Potentially_Use_Visible
(Full_View
(Id
), False);
2905 Set_In_Use
(System_Aux_Id
, False);
2909 Set_Redundant_Use
(Pack_Name
, False);
2916 if Present
(Hidden_By_Use_Clause
(N
)) then
2917 Elmt
:= First_Elmt
(Hidden_By_Use_Clause
(N
));
2918 while Present
(Elmt
) loop
2919 Set_Is_Immediately_Visible
(Node
(Elmt
));
2923 Set_Hidden_By_Use_Clause
(N
, No_Elist
);
2925 end End_Use_Package
;
2931 procedure End_Use_Type
(N
: Node_Id
) is
2938 Id
:= First
(Subtype_Marks
(N
));
2939 while Present
(Id
) loop
2941 -- A call to rtsfind may occur while analyzing a use_type clause,
2942 -- in which case the type marks are not resolved yet, and there is
2943 -- nothing to remove.
2945 if not Is_Entity_Name
(Id
)
2946 or else No
(Entity
(Id
))
2954 or else From_With_Type
(T
)
2958 -- Note that the use_Type clause may mention a subtype of the type
2959 -- whose primitive operations have been made visible. Here as
2960 -- elsewhere, it is the base type that matters for visibility.
2962 elsif In_Open_Scopes
(Scope
(Base_Type
(T
))) then
2965 elsif not Redundant_Use
(Id
) then
2966 Set_In_Use
(T
, False);
2967 Set_In_Use
(Base_Type
(T
), False);
2968 Op_List
:= Collect_Primitive_Operations
(T
);
2970 Elmt
:= First_Elmt
(Op_List
);
2971 while Present
(Elmt
) loop
2972 if Nkind
(Node
(Elmt
)) = N_Defining_Operator_Symbol
then
2973 Set_Is_Potentially_Use_Visible
(Node
(Elmt
), False);
2985 ----------------------
2986 -- Find_Direct_Name --
2987 ----------------------
2989 procedure Find_Direct_Name
(N
: Node_Id
) is
2994 Inst
: Entity_Id
:= Empty
;
2995 -- Enclosing instance, if any
2997 Homonyms
: Entity_Id
;
2998 -- Saves start of homonym chain
3000 Nvis_Entity
: Boolean;
3001 -- Set True to indicate that at there is at least one entity on the
3002 -- homonym chain which, while not visible, is visible enough from the
3003 -- user point of view to warrant an error message of "not visible"
3004 -- rather than undefined.
3006 Nvis_Is_Private_Subprg
: Boolean := False;
3007 -- Ada 2005 (AI-262): Set True to indicate that a form of Beaujolais
3008 -- effect concerning library subprograms has been detected. Used to
3009 -- generate the precise error message.
3011 function From_Actual_Package
(E
: Entity_Id
) return Boolean;
3012 -- Returns true if the entity is declared in a package that is
3013 -- an actual for a formal package of the current instance. Such an
3014 -- entity requires special handling because it may be use-visible
3015 -- but hides directly visible entities defined outside the instance.
3017 function Is_Actual_Parameter
return Boolean;
3018 -- This function checks if the node N is an identifier that is an actual
3019 -- parameter of a procedure call. If so it returns True, otherwise it
3020 -- return False. The reason for this check is that at this stage we do
3021 -- not know what procedure is being called if the procedure might be
3022 -- overloaded, so it is premature to go setting referenced flags or
3023 -- making calls to Generate_Reference. We will wait till Resolve_Actuals
3024 -- for that processing
3026 function Known_But_Invisible
(E
: Entity_Id
) return Boolean;
3027 -- This function determines whether the entity E (which is not
3028 -- visible) can reasonably be considered to be known to the writer
3029 -- of the reference. This is a heuristic test, used only for the
3030 -- purposes of figuring out whether we prefer to complain that an
3031 -- entity is undefined or invisible (and identify the declaration
3032 -- of the invisible entity in the latter case). The point here is
3033 -- that we don't want to complain that something is invisible and
3034 -- then point to something entirely mysterious to the writer.
3036 procedure Nvis_Messages
;
3037 -- Called if there are no visible entries for N, but there is at least
3038 -- one non-directly visible, or hidden declaration. This procedure
3039 -- outputs an appropriate set of error messages.
3041 procedure Undefined
(Nvis
: Boolean);
3042 -- This function is called if the current node has no corresponding
3043 -- visible entity or entities. The value set in Msg indicates whether
3044 -- an error message was generated (multiple error messages for the
3045 -- same variable are generally suppressed, see body for details).
3046 -- Msg is True if an error message was generated, False if not. This
3047 -- value is used by the caller to determine whether or not to output
3048 -- additional messages where appropriate. The parameter is set False
3049 -- to get the message "X is undefined", and True to get the message
3050 -- "X is not visible".
3052 -------------------------
3053 -- From_Actual_Package --
3054 -------------------------
3056 function From_Actual_Package
(E
: Entity_Id
) return Boolean is
3057 Scop
: constant Entity_Id
:= Scope
(E
);
3061 if not In_Instance
then
3064 Inst
:= Current_Scope
;
3065 while Present
(Inst
)
3066 and then Ekind
(Inst
) /= E_Package
3067 and then not Is_Generic_Instance
(Inst
)
3069 Inst
:= Scope
(Inst
);
3076 Act
:= First_Entity
(Inst
);
3077 while Present
(Act
) loop
3078 if Ekind
(Act
) = E_Package
then
3080 -- Check for end of actuals list
3082 if Renamed_Object
(Act
) = Inst
then
3085 elsif Present
(Associated_Formal_Package
(Act
))
3086 and then Renamed_Object
(Act
) = Scop
3088 -- Entity comes from (instance of) formal package
3103 end From_Actual_Package
;
3105 -------------------------
3106 -- Is_Actual_Parameter --
3107 -------------------------
3109 function Is_Actual_Parameter
return Boolean is
3112 Nkind
(N
) = N_Identifier
3114 (Nkind
(Parent
(N
)) = N_Procedure_Call_Statement
3116 (Nkind
(Parent
(N
)) = N_Parameter_Association
3117 and then N
= Explicit_Actual_Parameter
(Parent
(N
))
3118 and then Nkind
(Parent
(Parent
(N
))) =
3119 N_Procedure_Call_Statement
));
3120 end Is_Actual_Parameter
;
3122 -------------------------
3123 -- Known_But_Invisible --
3124 -------------------------
3126 function Known_But_Invisible
(E
: Entity_Id
) return Boolean is
3127 Fname
: File_Name_Type
;
3130 -- Entities in Standard are always considered to be known
3132 if Sloc
(E
) <= Standard_Location
then
3135 -- An entity that does not come from source is always considered
3136 -- to be unknown, since it is an artifact of code expansion.
3138 elsif not Comes_From_Source
(E
) then
3141 -- In gnat internal mode, we consider all entities known
3143 elsif GNAT_Mode
then
3147 -- Here we have an entity that is not from package Standard, and
3148 -- which comes from Source. See if it comes from an internal file.
3150 Fname
:= Unit_File_Name
(Get_Source_Unit
(E
));
3152 -- Case of from internal file
3154 if Is_Internal_File_Name
(Fname
) then
3156 -- Private part entities in internal files are never considered
3157 -- to be known to the writer of normal application code.
3159 if Is_Hidden
(E
) then
3163 -- Entities from System packages other than System and
3164 -- System.Storage_Elements are not considered to be known.
3165 -- System.Auxxxx files are also considered known to the user.
3167 -- Should refine this at some point to generally distinguish
3168 -- between known and unknown internal files ???
3170 Get_Name_String
(Fname
);
3175 Name_Buffer
(1 .. 2) /= "s-"
3177 Name_Buffer
(3 .. 8) = "stoele"
3179 Name_Buffer
(3 .. 5) = "aux";
3181 -- If not an internal file, then entity is definitely known,
3182 -- even if it is in a private part (the message generated will
3183 -- note that it is in a private part)
3188 end Known_But_Invisible
;
3194 procedure Nvis_Messages
is
3195 Comp_Unit
: Node_Id
;
3197 Hidden
: Boolean := False;
3201 -- Ada 2005 (AI-262): Generate a precise error concerning the
3202 -- Beaujolais effect that was previously detected
3204 if Nvis_Is_Private_Subprg
then
3206 pragma Assert
(Nkind
(E2
) = N_Defining_Identifier
3207 and then Ekind
(E2
) = E_Function
3208 and then Scope
(E2
) = Standard_Standard
3209 and then Has_Private_With
(E2
));
3211 -- Find the sloc corresponding to the private with'ed unit
3213 Comp_Unit
:= Cunit
(Current_Sem_Unit
);
3214 Error_Msg_Sloc
:= No_Location
;
3216 Item
:= First
(Context_Items
(Comp_Unit
));
3217 while Present
(Item
) loop
3218 if Nkind
(Item
) = N_With_Clause
3219 and then Private_Present
(Item
)
3220 and then Entity
(Name
(Item
)) = E2
3222 Error_Msg_Sloc
:= Sloc
(Item
);
3229 pragma Assert
(Error_Msg_Sloc
/= No_Location
);
3231 Error_Msg_N
("(Ada 2005): hidden by private with clause #", N
);
3235 Undefined
(Nvis
=> True);
3239 -- First loop does hidden declarations
3242 while Present
(Ent
) loop
3243 if Is_Potentially_Use_Visible
(Ent
) then
3245 Error_Msg_N
("multiple use clauses cause hiding!", N
);
3249 Error_Msg_Sloc
:= Sloc
(Ent
);
3250 Error_Msg_N
("hidden declaration#!", N
);
3253 Ent
:= Homonym
(Ent
);
3256 -- If we found hidden declarations, then that's enough, don't
3257 -- bother looking for non-visible declarations as well.
3263 -- Second loop does non-directly visible declarations
3266 while Present
(Ent
) loop
3267 if not Is_Potentially_Use_Visible
(Ent
) then
3269 -- Do not bother the user with unknown entities
3271 if not Known_But_Invisible
(Ent
) then
3275 Error_Msg_Sloc
:= Sloc
(Ent
);
3277 -- Output message noting that there is a non-visible
3278 -- declaration, distinguishing the private part case.
3280 if Is_Hidden
(Ent
) then
3281 Error_Msg_N
("non-visible (private) declaration#!", N
);
3283 Error_Msg_N
("non-visible declaration#!", N
);
3285 if Is_Compilation_Unit
(Ent
)
3287 Nkind
(Parent
(Parent
(N
))) = N_Use_Package_Clause
3289 Error_Msg_Qual_Level
:= 99;
3290 Error_Msg_NE
("\\missing `WITH &;`", N
, Ent
);
3291 Error_Msg_Qual_Level
:= 0;
3295 -- Set entity and its containing package as referenced. We
3296 -- can't be sure of this, but this seems a better choice
3297 -- to avoid unused entity messages.
3299 if Comes_From_Source
(Ent
) then
3300 Set_Referenced
(Ent
);
3301 Set_Referenced
(Cunit_Entity
(Get_Source_Unit
(Ent
)));
3306 Ent
:= Homonym
(Ent
);
3315 procedure Undefined
(Nvis
: Boolean) is
3316 Emsg
: Error_Msg_Id
;
3319 -- We should never find an undefined internal name. If we do, then
3320 -- see if we have previous errors. If so, ignore on the grounds that
3321 -- it is probably a cascaded message (e.g. a block label from a badly
3322 -- formed block). If no previous errors, then we have a real internal
3323 -- error of some kind so raise an exception.
3325 if Is_Internal_Name
(Chars
(N
)) then
3326 if Total_Errors_Detected
/= 0 then
3329 raise Program_Error
;
3333 -- A very specialized error check, if the undefined variable is
3334 -- a case tag, and the case type is an enumeration type, check
3335 -- for a possible misspelling, and if so, modify the identifier
3337 -- Named aggregate should also be handled similarly ???
3339 if Nkind
(N
) = N_Identifier
3340 and then Nkind
(Parent
(N
)) = N_Case_Statement_Alternative
3342 Get_Name_String
(Chars
(N
));
3345 Case_Str
: constant String := Name_Buffer
(1 .. Name_Len
);
3346 Case_Stm
: constant Node_Id
:= Parent
(Parent
(N
));
3347 Case_Typ
: constant Entity_Id
:= Etype
(Expression
(Case_Stm
));
3348 Case_Rtp
: constant Entity_Id
:= Root_Type
(Case_Typ
);
3353 if Is_Enumeration_Type
(Case_Typ
)
3354 and then Case_Rtp
/= Standard_Character
3355 and then Case_Rtp
/= Standard_Wide_Character
3356 and then Case_Rtp
/= Standard_Wide_Wide_Character
3358 Lit
:= First_Literal
(Case_Typ
);
3359 Get_Name_String
(Chars
(Lit
));
3361 if Chars
(Lit
) /= Chars
(N
)
3362 and then Is_Bad_Spelling_Of
3363 (Case_Str
, Name_Buffer
(1 .. Name_Len
))
3365 Error_Msg_Node_2
:= Lit
;
3367 ("& is undefined, assume misspelling of &", N
);
3368 Rewrite
(N
, New_Occurrence_Of
(Lit
, Sloc
(N
)));
3372 Lit
:= Next_Literal
(Lit
);
3377 -- Normal processing
3379 Set_Entity
(N
, Any_Id
);
3380 Set_Etype
(N
, Any_Type
);
3382 -- We use the table Urefs to keep track of entities for which we
3383 -- have issued errors for undefined references. Multiple errors
3384 -- for a single name are normally suppressed, however we modify
3385 -- the error message to alert the programmer to this effect.
3387 for J
in Urefs
.First
.. Urefs
.Last
loop
3388 if Chars
(N
) = Chars
(Urefs
.Table
(J
).Node
) then
3389 if Urefs
.Table
(J
).Err
/= No_Error_Msg
3390 and then Sloc
(N
) /= Urefs
.Table
(J
).Loc
3392 Error_Msg_Node_1
:= Urefs
.Table
(J
).Node
;
3394 if Urefs
.Table
(J
).Nvis
then
3395 Change_Error_Text
(Urefs
.Table
(J
).Err
,
3396 "& is not visible (more references follow)");
3398 Change_Error_Text
(Urefs
.Table
(J
).Err
,
3399 "& is undefined (more references follow)");
3402 Urefs
.Table
(J
).Err
:= No_Error_Msg
;
3405 -- Although we will set Msg False, and thus suppress the
3406 -- message, we also set Error_Posted True, to avoid any
3407 -- cascaded messages resulting from the undefined reference.
3410 Set_Error_Posted
(N
, True);
3415 -- If entry not found, this is first undefined occurrence
3418 Error_Msg_N
("& is not visible!", N
);
3422 Error_Msg_N
("& is undefined!", N
);
3425 -- A very bizarre special check, if the undefined identifier
3426 -- is put or put_line, then add a special error message (since
3427 -- this is a very common error for beginners to make).
3429 if Chars
(N
) = Name_Put
or else Chars
(N
) = Name_Put_Line
then
3431 ("\\possible missing `WITH Ada.Text_'I'O; " &
3432 "USE Ada.Text_'I'O`!", N
);
3434 -- Another special check if N is the prefix of a selected
3435 -- component which is a known unit, add message complaining
3436 -- about missing with for this unit.
3438 elsif Nkind
(Parent
(N
)) = N_Selected_Component
3439 and then N
= Prefix
(Parent
(N
))
3440 and then Is_Known_Unit
(Parent
(N
))
3442 Error_Msg_Node_2
:= Selector_Name
(Parent
(N
));
3443 Error_Msg_N
("\\missing `WITH &.&;`", Prefix
(Parent
(N
)));
3446 -- Now check for possible misspellings
3448 Get_Name_String
(Chars
(N
));
3452 Ematch
: Entity_Id
:= Empty
;
3454 Last_Name_Id
: constant Name_Id
:=
3455 Name_Id
(Nat
(First_Name_Id
) +
3456 Name_Entries_Count
- 1);
3458 S
: constant String (1 .. Name_Len
) :=
3459 Name_Buffer
(1 .. Name_Len
);
3462 for N
in First_Name_Id
.. Last_Name_Id
loop
3463 E
:= Get_Name_Entity_Id
(N
);
3466 and then (Is_Immediately_Visible
(E
)
3468 Is_Potentially_Use_Visible
(E
))
3470 Get_Name_String
(N
);
3472 if Is_Bad_Spelling_Of
3473 (S
, Name_Buffer
(1 .. Name_Len
))
3481 if Present
(Ematch
) then
3482 Error_Msg_NE
("\possible misspelling of&", N
, Ematch
);
3487 -- Make entry in undefined references table unless the full errors
3488 -- switch is set, in which case by refraining from generating the
3489 -- table entry, we guarantee that we get an error message for every
3490 -- undefined reference.
3492 if not All_Errors_Mode
then
3503 -- Start of processing for Find_Direct_Name
3506 -- If the entity pointer is already set, this is an internal node, or
3507 -- a node that is analyzed more than once, after a tree modification.
3508 -- In such a case there is no resolution to perform, just set the type.
3510 if Present
(Entity
(N
)) then
3511 if Is_Type
(Entity
(N
)) then
3512 Set_Etype
(N
, Entity
(N
));
3516 Entyp
: constant Entity_Id
:= Etype
(Entity
(N
));
3519 -- One special case here. If the Etype field is already set,
3520 -- and references the packed array type corresponding to the
3521 -- etype of the referenced entity, then leave it alone. This
3522 -- happens for trees generated from Exp_Pakd, where expressions
3523 -- can be deliberately "mis-typed" to the packed array type.
3525 if Is_Array_Type
(Entyp
)
3526 and then Is_Packed
(Entyp
)
3527 and then Present
(Etype
(N
))
3528 and then Etype
(N
) = Packed_Array_Type
(Entyp
)
3532 -- If not that special case, then just reset the Etype
3535 Set_Etype
(N
, Etype
(Entity
(N
)));
3543 -- Here if Entity pointer was not set, we need full visibility analysis
3544 -- First we generate debugging output if the debug E flag is set.
3546 if Debug_Flag_E
then
3547 Write_Str
("Looking for ");
3548 Write_Name
(Chars
(N
));
3552 Homonyms
:= Current_Entity
(N
);
3553 Nvis_Entity
:= False;
3556 while Present
(E
) loop
3558 -- If entity is immediately visible or potentially use
3559 -- visible, then process the entity and we are done.
3561 if Is_Immediately_Visible
(E
) then
3562 goto Immediately_Visible_Entity
;
3564 elsif Is_Potentially_Use_Visible
(E
) then
3565 goto Potentially_Use_Visible_Entity
;
3567 -- Note if a known but invisible entity encountered
3569 elsif Known_But_Invisible
(E
) then
3570 Nvis_Entity
:= True;
3573 -- Move to next entity in chain and continue search
3578 -- If no entries on homonym chain that were potentially visible,
3579 -- and no entities reasonably considered as non-visible, then
3580 -- we have a plain undefined reference, with no additional
3581 -- explanation required!
3583 if not Nvis_Entity
then
3584 Undefined
(Nvis
=> False);
3586 -- Otherwise there is at least one entry on the homonym chain that
3587 -- is reasonably considered as being known and non-visible.
3595 -- Processing for a potentially use visible entry found. We must search
3596 -- the rest of the homonym chain for two reasons. First, if there is a
3597 -- directly visible entry, then none of the potentially use-visible
3598 -- entities are directly visible (RM 8.4(10)). Second, we need to check
3599 -- for the case of multiple potentially use-visible entries hiding one
3600 -- another and as a result being non-directly visible (RM 8.4(11)).
3602 <<Potentially_Use_Visible_Entity
>> declare
3603 Only_One_Visible
: Boolean := True;
3604 All_Overloadable
: Boolean := Is_Overloadable
(E
);
3608 while Present
(E2
) loop
3609 if Is_Immediately_Visible
(E2
) then
3611 -- If the use-visible entity comes from the actual for a
3612 -- formal package, it hides a directly visible entity from
3613 -- outside the instance.
3615 if From_Actual_Package
(E
)
3616 and then Scope_Depth
(E2
) < Scope_Depth
(Inst
)
3621 goto Immediately_Visible_Entity
;
3624 elsif Is_Potentially_Use_Visible
(E2
) then
3625 Only_One_Visible
:= False;
3626 All_Overloadable
:= All_Overloadable
and Is_Overloadable
(E2
);
3628 -- Ada 2005 (AI-262): Protect against a form of Beujolais effect
3629 -- that can occurr in private_with clauses. Example:
3632 -- private with B; package A is
3633 -- package C is function B return Integer;
3635 -- V1 : Integer := B;
3636 -- private function B return Integer;
3637 -- V2 : Integer := B;
3640 -- V1 resolves to A.B, but V2 resolves to library unit B
3642 elsif Ekind
(E2
) = E_Function
3643 and then Scope
(E2
) = Standard_Standard
3644 and then Has_Private_With
(E2
)
3646 Only_One_Visible
:= False;
3647 All_Overloadable
:= False;
3648 Nvis_Is_Private_Subprg
:= True;
3655 -- On falling through this loop, we have checked that there are no
3656 -- immediately visible entities. Only_One_Visible is set if exactly
3657 -- one potentially use visible entity exists. All_Overloadable is
3658 -- set if all the potentially use visible entities are overloadable.
3659 -- The condition for legality is that either there is one potentially
3660 -- use visible entity, or if there is more than one, then all of them
3661 -- are overloadable.
3663 if Only_One_Visible
or All_Overloadable
then
3666 -- If there is more than one potentially use-visible entity and at
3667 -- least one of them non-overloadable, we have an error (RM 8.4(11).
3668 -- Note that E points to the first such entity on the homonym list.
3669 -- Special case: if one of the entities is declared in an actual
3670 -- package, it was visible in the generic, and takes precedence over
3671 -- other entities that are potentially use-visible. Same if it is
3672 -- declared in a local instantiation of the current instance.
3677 -- Find current instance
3679 Inst
:= Current_Scope
;
3680 while Present
(Inst
)
3681 and then Inst
/= Standard_Standard
3683 if Is_Generic_Instance
(Inst
) then
3687 Inst
:= Scope
(Inst
);
3691 while Present
(E2
) loop
3692 if From_Actual_Package
(E2
)
3694 (Is_Generic_Instance
(Scope
(E2
))
3695 and then Scope_Depth
(Scope
(E2
)) > Scope_Depth
(Inst
))
3708 Is_Predefined_File_Name
(Unit_File_Name
(Current_Sem_Unit
))
3710 -- A use-clause in the body of a system file creates conflict
3711 -- with some entity in a user scope, while rtsfind is active.
3712 -- Keep only the entity coming from another predefined unit.
3715 while Present
(E2
) loop
3716 if Is_Predefined_File_Name
3717 (Unit_File_Name
(Get_Source_Unit
(Sloc
(E2
))))
3726 -- Entity must exist because predefined unit is correct
3728 raise Program_Error
;
3737 -- Come here with E set to the first immediately visible entity on
3738 -- the homonym chain. This is the one we want unless there is another
3739 -- immediately visible entity further on in the chain for a more
3740 -- inner scope (RM 8.3(8)).
3742 <<Immediately_Visible_Entity
>> declare
3747 -- Find scope level of initial entity. When compiling through
3748 -- Rtsfind, the previous context is not completely invisible, and
3749 -- an outer entity may appear on the chain, whose scope is below
3750 -- the entry for Standard that delimits the current scope stack.
3751 -- Indicate that the level for this spurious entry is outside of
3752 -- the current scope stack.
3754 Level
:= Scope_Stack
.Last
;
3756 Scop
:= Scope_Stack
.Table
(Level
).Entity
;
3757 exit when Scop
= Scope
(E
);
3759 exit when Scop
= Standard_Standard
;
3762 -- Now search remainder of homonym chain for more inner entry
3763 -- If the entity is Standard itself, it has no scope, and we
3764 -- compare it with the stack entry directly.
3767 while Present
(E2
) loop
3768 if Is_Immediately_Visible
(E2
) then
3770 -- If a generic package contains a local declaration that
3771 -- has the same name as the generic, there may be a visibility
3772 -- conflict in an instance, where the local declaration must
3773 -- also hide the name of the corresponding package renaming.
3774 -- We check explicitly for a package declared by a renaming,
3775 -- whose renamed entity is an instance that is on the scope
3776 -- stack, and that contains a homonym in the same scope. Once
3777 -- we have found it, we know that the package renaming is not
3778 -- immediately visible, and that the identifier denotes the
3779 -- other entity (and its homonyms if overloaded).
3781 if Scope
(E
) = Scope
(E2
)
3782 and then Ekind
(E
) = E_Package
3783 and then Present
(Renamed_Object
(E
))
3784 and then Is_Generic_Instance
(Renamed_Object
(E
))
3785 and then In_Open_Scopes
(Renamed_Object
(E
))
3786 and then Comes_From_Source
(N
)
3788 Set_Is_Immediately_Visible
(E
, False);
3792 for J
in Level
+ 1 .. Scope_Stack
.Last
loop
3793 if Scope_Stack
.Table
(J
).Entity
= Scope
(E2
)
3794 or else Scope_Stack
.Table
(J
).Entity
= E2
3807 -- At the end of that loop, E is the innermost immediately
3808 -- visible entity, so we are all set.
3811 -- Come here with entity found, and stored in E
3815 if Comes_From_Source
(N
)
3816 and then Is_Remote_Access_To_Subprogram_Type
(E
)
3817 and then Expander_Active
3818 and then Get_PCS_Name
/= Name_No_DSA
3821 New_Occurrence_Of
(Equivalent_Type
(E
), Sloc
(N
)));
3826 -- Why no Style_Check here???
3831 Set_Etype
(N
, Get_Full_View
(Etype
(E
)));
3834 if Debug_Flag_E
then
3835 Write_Str
(" found ");
3836 Write_Entity_Info
(E
, " ");
3839 -- If the Ekind of the entity is Void, it means that all homonyms
3840 -- are hidden from all visibility (RM 8.3(5,14-20)). However, this
3841 -- test is skipped if the current scope is a record and the name is
3842 -- a pragma argument expression (case of Atomic and Volatile pragmas
3843 -- and possibly other similar pragmas added later, which are allowed
3844 -- to reference components in the current record).
3846 if Ekind
(E
) = E_Void
3848 (not Is_Record_Type
(Current_Scope
)
3849 or else Nkind
(Parent
(N
)) /= N_Pragma_Argument_Association
)
3851 Premature_Usage
(N
);
3853 -- If the entity is overloadable, collect all interpretations of the
3854 -- name for subsequent overload resolution. We optimize a bit here to
3855 -- do this only if we have an overloadable entity that is not on its
3856 -- own on the homonym chain.
3858 elsif Is_Overloadable
(E
)
3859 and then (Present
(Homonym
(E
)) or else Current_Entity
(N
) /= E
)
3861 Collect_Interps
(N
);
3863 -- If no homonyms were visible, the entity is unambiguous
3865 if not Is_Overloaded
(N
) then
3866 if not Is_Actual_Parameter
then
3867 Generate_Reference
(E
, N
);
3871 -- Case of non-overloadable entity, set the entity providing that
3872 -- we do not have the case of a discriminant reference within a
3873 -- default expression. Such references are replaced with the
3874 -- corresponding discriminal, which is the formal corresponding to
3875 -- to the discriminant in the initialization procedure.
3878 -- Entity is unambiguous, indicate that it is referenced here. One
3879 -- slightly odd case is that we do not want to set the Referenced
3880 -- flag if the entity is a label, and the identifier is the label
3881 -- in the source, since this is not a reference from the point of
3884 if Nkind
(Parent
(N
)) = N_Label
then
3886 R
: constant Boolean := Referenced
(E
);
3888 if not Is_Actual_Parameter
then
3889 Generate_Reference
(E
, N
);
3890 Set_Referenced
(E
, R
);
3894 -- Normal case, not a label: generate reference
3896 -- ??? It is too early to generate a reference here even if
3897 -- the entity is unambiguous, because the tree is not
3898 -- sufficiently typed at this point for Generate_Reference to
3899 -- determine whether this reference modifies the denoted object
3900 -- (because implicit derefences cannot be identified prior to
3901 -- full type resolution).
3903 -- ??? The Is_Actual_Parameter routine takes care of one of these
3904 -- cases but there are others probably
3907 if not Is_Actual_Parameter
then
3908 Generate_Reference
(E
, N
);
3911 Check_Nested_Access
(E
);
3914 -- Set Entity, with style check if need be. For a discriminant
3915 -- reference, replace by the corresponding discriminal, i.e. the
3916 -- parameter of the initialization procedure that corresponds to
3917 -- the discriminant. If this replacement is being performed, there
3918 -- is no style check to perform.
3920 -- This replacement must not be done if we are currently
3921 -- processing a generic spec or body, because the discriminal
3922 -- has not been not generated in this case.
3924 if not In_Default_Expression
3925 or else Ekind
(E
) /= E_Discriminant
3926 or else Inside_A_Generic
3928 Set_Entity_With_Style_Check
(N
, E
);
3930 -- The replacement is not done either for a task discriminant that
3931 -- appears in a default expression of an entry parameter. See
3932 -- Expand_Discriminant in exp_ch2 for details on their handling.
3934 elsif Is_Concurrent_Type
(Scope
(E
)) then
3941 and then Nkind
(P
) /= N_Parameter_Specification
3942 and then Nkind
(P
) /= N_Component_Declaration
3948 and then Nkind
(P
) = N_Parameter_Specification
3952 Set_Entity
(N
, Discriminal
(E
));
3956 -- Otherwise, this is a discriminant in a context in which
3957 -- it is a reference to the corresponding parameter of the
3958 -- init proc for the enclosing type.
3961 Set_Entity
(N
, Discriminal
(E
));
3965 end Find_Direct_Name
;
3967 ------------------------
3968 -- Find_Expanded_Name --
3969 ------------------------
3971 -- This routine searches the homonym chain of the entity until it finds
3972 -- an entity declared in the scope denoted by the prefix. If the entity
3973 -- is private, it may nevertheless be immediately visible, if we are in
3974 -- the scope of its declaration.
3976 procedure Find_Expanded_Name
(N
: Node_Id
) is
3977 Selector
: constant Node_Id
:= Selector_Name
(N
);
3978 Candidate
: Entity_Id
:= Empty
;
3984 P_Name
:= Entity
(Prefix
(N
));
3987 -- If the prefix is a renamed package, look for the entity
3988 -- in the original package.
3990 if Ekind
(P_Name
) = E_Package
3991 and then Present
(Renamed_Object
(P_Name
))
3993 P_Name
:= Renamed_Object
(P_Name
);
3995 -- Rewrite node with entity field pointing to renamed object
3997 Rewrite
(Prefix
(N
), New_Copy
(Prefix
(N
)));
3998 Set_Entity
(Prefix
(N
), P_Name
);
4000 -- If the prefix is an object of a concurrent type, look for
4001 -- the entity in the associated task or protected type.
4003 elsif Is_Concurrent_Type
(Etype
(P_Name
)) then
4004 P_Name
:= Etype
(P_Name
);
4007 Id
:= Current_Entity
(Selector
);
4010 Is_New_Candidate
: Boolean;
4013 while Present
(Id
) loop
4014 if Scope
(Id
) = P_Name
then
4016 Is_New_Candidate
:= True;
4018 -- Ada 2005 (AI-217): Handle shadow entities associated with types
4019 -- declared in limited-withed nested packages. We don't need to
4020 -- handle E_Incomplete_Subtype entities because the entities in
4021 -- the limited view are always E_Incomplete_Type entities (see
4022 -- Build_Limited_Views). Regarding the expression used to evaluate
4023 -- the scope, it is important to note that the limited view also
4024 -- has shadow entities associated nested packages. For this reason
4025 -- the correct scope of the entity is the scope of the real entity
4026 -- The non-limited view may itself be incomplete, in which case
4027 -- get the full view if available.
4029 elsif From_With_Type
(Id
)
4030 and then Is_Type
(Id
)
4031 and then Ekind
(Id
) = E_Incomplete_Type
4032 and then Present
(Non_Limited_View
(Id
))
4033 and then Scope
(Non_Limited_View
(Id
)) = P_Name
4035 Candidate
:= Get_Full_View
(Non_Limited_View
(Id
));
4036 Is_New_Candidate
:= True;
4039 Is_New_Candidate
:= False;
4042 if Is_New_Candidate
then
4043 if Is_Child_Unit
(Id
) then
4044 exit when Is_Visible_Child_Unit
(Id
)
4045 or else Is_Immediately_Visible
(Id
);
4048 exit when not Is_Hidden
(Id
)
4049 or else Is_Immediately_Visible
(Id
);
4058 and then (Ekind
(P_Name
) = E_Procedure
4060 Ekind
(P_Name
) = E_Function
)
4061 and then Is_Generic_Instance
(P_Name
)
4063 -- Expanded name denotes entity in (instance of) generic subprogram.
4064 -- The entity may be in the subprogram instance, or may denote one of
4065 -- the formals, which is declared in the enclosing wrapper package.
4067 P_Name
:= Scope
(P_Name
);
4069 Id
:= Current_Entity
(Selector
);
4070 while Present
(Id
) loop
4071 exit when Scope
(Id
) = P_Name
;
4076 if No
(Id
) or else Chars
(Id
) /= Chars
(Selector
) then
4077 Set_Etype
(N
, Any_Type
);
4079 -- If we are looking for an entity defined in System, try to
4080 -- find it in the child package that may have been provided as
4081 -- an extension to System. The Extend_System pragma will have
4082 -- supplied the name of the extension, which may have to be loaded.
4084 if Chars
(P_Name
) = Name_System
4085 and then Scope
(P_Name
) = Standard_Standard
4086 and then Present
(System_Extend_Unit
)
4087 and then Present_System_Aux
(N
)
4089 Set_Entity
(Prefix
(N
), System_Aux_Id
);
4090 Find_Expanded_Name
(N
);
4093 elsif Nkind
(Selector
) = N_Operator_Symbol
4094 and then Has_Implicit_Operator
(N
)
4096 -- There is an implicit instance of the predefined operator in
4097 -- the given scope. The operator entity is defined in Standard.
4098 -- Has_Implicit_Operator makes the node into an Expanded_Name.
4102 elsif Nkind
(Selector
) = N_Character_Literal
4103 and then Has_Implicit_Character_Literal
(N
)
4105 -- If there is no literal defined in the scope denoted by the
4106 -- prefix, the literal may belong to (a type derived from)
4107 -- Standard_Character, for which we have no explicit literals.
4112 -- If the prefix is a single concurrent object, use its
4113 -- name in the error message, rather than that of the
4116 if Is_Concurrent_Type
(P_Name
)
4117 and then Is_Internal_Name
(Chars
(P_Name
))
4119 Error_Msg_Node_2
:= Entity
(Prefix
(N
));
4121 Error_Msg_Node_2
:= P_Name
;
4124 if P_Name
= System_Aux_Id
then
4125 P_Name
:= Scope
(P_Name
);
4126 Set_Entity
(Prefix
(N
), P_Name
);
4129 if Present
(Candidate
) then
4131 -- If we know that the unit is a child unit we can give a more
4132 -- accurate error message.
4134 if Is_Child_Unit
(Candidate
) then
4136 -- If the candidate is a private child unit and we are in
4137 -- the visible part of a public unit, specialize the error
4138 -- message. There might be a private with_clause for it,
4139 -- but it is not currently active.
4141 if Is_Private_Descendant
(Candidate
)
4142 and then Ekind
(Current_Scope
) = E_Package
4143 and then not In_Private_Part
(Current_Scope
)
4144 and then not Is_Private_Descendant
(Current_Scope
)
4146 Error_Msg_N
("private child unit& is not visible here",
4149 -- Normal case where we have a missing with for a child unit
4152 Error_Msg_Qual_Level
:= 99;
4153 Error_Msg_NE
("missing `WITH &;`", Selector
, Candidate
);
4154 Error_Msg_Qual_Level
:= 0;
4157 -- Here we don't know that this is a child unit
4160 Error_Msg_NE
("& is not a visible entity of&", N
, Selector
);
4164 -- Within the instantiation of a child unit, the prefix may
4165 -- denote the parent instance, but the selector has the name
4166 -- of the original child. Find whether we are within the
4167 -- corresponding instance, and get the proper entity, which
4168 -- can only be an enclosing scope.
4171 and then In_Open_Scopes
(P_Name
)
4172 and then Is_Generic_Instance
(P_Name
)
4175 S
: Entity_Id
:= Current_Scope
;
4179 for J
in reverse 0 .. Scope_Stack
.Last
loop
4180 S
:= Scope_Stack
.Table
(J
).Entity
;
4182 exit when S
= Standard_Standard
;
4184 if Ekind
(S
) = E_Function
4185 or else Ekind
(S
) = E_Package
4186 or else Ekind
(S
) = E_Procedure
4188 P
:= Generic_Parent
(Specification
4189 (Unit_Declaration_Node
(S
)));
4192 and then Chars
(Scope
(P
)) = Chars
(O_Name
)
4193 and then Chars
(P
) = Chars
(Selector
)
4204 -- If this is a selection from Ada, System or Interfaces, then
4205 -- we assume a missing with for the corresponding package.
4207 if Is_Known_Unit
(N
) then
4208 if not Error_Posted
(N
) then
4209 Error_Msg_Node_2
:= Selector
;
4210 Error_Msg_N
("missing `WITH &.&;`", Prefix
(N
));
4213 -- If this is a selection from a dummy package, then suppress
4214 -- the error message, of course the entity is missing if the
4215 -- package is missing!
4217 elsif Sloc
(Error_Msg_Node_2
) = No_Location
then
4220 -- Here we have the case of an undefined component
4223 Error_Msg_NE
("& not declared in&", N
, Selector
);
4225 -- Check for misspelling of some entity in prefix
4227 Id
:= First_Entity
(P_Name
);
4228 Get_Name_String
(Chars
(Selector
));
4231 S
: constant String (1 .. Name_Len
) :=
4232 Name_Buffer
(1 .. Name_Len
);
4234 while Present
(Id
) loop
4235 Get_Name_String
(Chars
(Id
));
4236 if Is_Bad_Spelling_Of
4237 (Name_Buffer
(1 .. Name_Len
), S
)
4238 and then not Is_Internal_Name
(Chars
(Id
))
4241 ("possible misspelling of&", Selector
, Id
);
4249 -- Specialize the message if this may be an instantiation
4250 -- of a child unit that was not mentioned in the context.
4252 if Nkind
(Parent
(N
)) = N_Package_Instantiation
4253 and then Is_Generic_Instance
(Entity
(Prefix
(N
)))
4254 and then Is_Compilation_Unit
4255 (Generic_Parent
(Parent
(Entity
(Prefix
(N
)))))
4257 Error_Msg_Node_2
:= Selector
;
4258 Error_Msg_N
("\missing `WITH &.&;`", Prefix
(N
));
4268 if Comes_From_Source
(N
)
4269 and then Is_Remote_Access_To_Subprogram_Type
(Id
)
4270 and then Present
(Equivalent_Type
(Id
))
4272 -- If we are not actually generating distribution code (i.e. the
4273 -- current PCS is the dummy non-distributed version), then the
4274 -- Equivalent_Type will be missing, and Id should be treated as
4275 -- a regular access-to-subprogram type.
4277 Id
:= Equivalent_Type
(Id
);
4278 Set_Chars
(Selector
, Chars
(Id
));
4281 -- Ada 2005 (AI-50217): Check usage of entities in limited withed units
4283 if Ekind
(P_Name
) = E_Package
4284 and then From_With_Type
(P_Name
)
4286 if From_With_Type
(Id
)
4287 or else Is_Type
(Id
)
4288 or else Ekind
(Id
) = E_Package
4293 ("limited withed package can only be used to access "
4294 & " incomplete types",
4299 if Is_Task_Type
(P_Name
)
4300 and then ((Ekind
(Id
) = E_Entry
4301 and then Nkind
(Parent
(N
)) /= N_Attribute_Reference
)
4303 (Ekind
(Id
) = E_Entry_Family
4305 Nkind
(Parent
(Parent
(N
))) /= N_Attribute_Reference
))
4307 -- It is an entry call after all, either to the current task (which
4308 -- will deadlock) or to an enclosing task.
4310 Analyze_Selected_Component
(N
);
4314 Change_Selected_Component_To_Expanded_Name
(N
);
4316 -- Do style check and generate reference, but skip both steps if this
4317 -- entity has homonyms, since we may not have the right homonym set yet.
4318 -- The proper homonym will be set during the resolve phase.
4320 if Has_Homonym
(Id
) then
4323 Set_Entity_With_Style_Check
(N
, Id
);
4324 Generate_Reference
(Id
, N
);
4327 if Is_Type
(Id
) then
4330 Set_Etype
(N
, Get_Full_View
(Etype
(Id
)));
4333 -- If the Ekind of the entity is Void, it means that all homonyms are
4334 -- hidden from all visibility (RM 8.3(5,14-20)).
4336 if Ekind
(Id
) = E_Void
then
4337 Premature_Usage
(N
);
4339 elsif Is_Overloadable
(Id
)
4340 and then Present
(Homonym
(Id
))
4343 H
: Entity_Id
:= Homonym
(Id
);
4346 while Present
(H
) loop
4347 if Scope
(H
) = Scope
(Id
)
4350 or else Is_Immediately_Visible
(H
))
4352 Collect_Interps
(N
);
4359 -- If an extension of System is present, collect possible explicit
4360 -- overloadings declared in the extension.
4362 if Chars
(P_Name
) = Name_System
4363 and then Scope
(P_Name
) = Standard_Standard
4364 and then Present
(System_Extend_Unit
)
4365 and then Present_System_Aux
(N
)
4367 H
:= Current_Entity
(Id
);
4369 while Present
(H
) loop
4370 if Scope
(H
) = System_Aux_Id
then
4371 Add_One_Interp
(N
, H
, Etype
(H
));
4380 if Nkind
(Selector_Name
(N
)) = N_Operator_Symbol
4381 and then Scope
(Id
) /= Standard_Standard
4383 -- In addition to user-defined operators in the given scope, there
4384 -- may be an implicit instance of the predefined operator. The
4385 -- operator (defined in Standard) is found in Has_Implicit_Operator,
4386 -- and added to the interpretations. Procedure Add_One_Interp will
4387 -- determine which hides which.
4389 if Has_Implicit_Operator
(N
) then
4393 end Find_Expanded_Name
;
4395 -------------------------
4396 -- Find_Renamed_Entity --
4397 -------------------------
4399 function Find_Renamed_Entity
4403 Is_Actual
: Boolean := False) return Entity_Id
4406 I1
: Interp_Index
:= 0; -- Suppress junk warnings
4412 function Enclosing_Instance
return Entity_Id
;
4413 -- If the renaming determines the entity for the default of a formal
4414 -- subprogram nested within another instance, choose the innermost
4415 -- candidate. This is because if the formal has a box, and we are within
4416 -- an enclosing instance where some candidate interpretations are local
4417 -- to this enclosing instance, we know that the default was properly
4418 -- resolved when analyzing the generic, so we prefer the local
4419 -- candidates to those that are external. This is not always the case
4420 -- but is a reasonable heuristic on the use of nested generics. The
4421 -- proper solution requires a full renaming model.
4423 function Is_Visible_Operation
(Op
: Entity_Id
) return Boolean;
4424 -- If the renamed entity is an implicit operator, check whether it is
4425 -- visible because its operand type is properly visible. This check
4426 -- applies to explicit renamed entities that appear in the source in a
4427 -- renaming declaration or a formal subprogram instance, but not to
4428 -- default generic actuals with a name.
4430 function Report_Overload
return Entity_Id
;
4431 -- List possible interpretations, and specialize message in the
4432 -- case of a generic actual.
4434 function Within
(Inner
, Outer
: Entity_Id
) return Boolean;
4435 -- Determine whether a candidate subprogram is defined within the
4436 -- enclosing instance. If yes, it has precedence over outer candidates.
4438 ------------------------
4439 -- Enclosing_Instance --
4440 ------------------------
4442 function Enclosing_Instance
return Entity_Id
is
4446 if not Is_Generic_Instance
(Current_Scope
)
4447 and then not Is_Actual
4452 S
:= Scope
(Current_Scope
);
4453 while S
/= Standard_Standard
loop
4454 if Is_Generic_Instance
(S
) then
4462 end Enclosing_Instance
;
4464 --------------------------
4465 -- Is_Visible_Operation --
4466 --------------------------
4468 function Is_Visible_Operation
(Op
: Entity_Id
) return Boolean is
4474 if Ekind
(Op
) /= E_Operator
4475 or else Scope
(Op
) /= Standard_Standard
4476 or else (In_Instance
4479 or else Present
(Enclosing_Instance
)))
4484 -- For a fixed point type operator, check the resulting type,
4485 -- because it may be a mixed mode integer * fixed operation.
4487 if Present
(Next_Formal
(First_Formal
(New_S
)))
4488 and then Is_Fixed_Point_Type
(Etype
(New_S
))
4490 Typ
:= Etype
(New_S
);
4492 Typ
:= Etype
(First_Formal
(New_S
));
4495 Btyp
:= Base_Type
(Typ
);
4497 if Nkind
(Nam
) /= N_Expanded_Name
then
4498 return (In_Open_Scopes
(Scope
(Btyp
))
4499 or else Is_Potentially_Use_Visible
(Btyp
)
4500 or else In_Use
(Btyp
)
4501 or else In_Use
(Scope
(Btyp
)));
4504 Scop
:= Entity
(Prefix
(Nam
));
4506 if Ekind
(Scop
) = E_Package
4507 and then Present
(Renamed_Object
(Scop
))
4509 Scop
:= Renamed_Object
(Scop
);
4512 -- Operator is visible if prefix of expanded name denotes
4513 -- scope of type, or else type type is defined in System_Aux
4514 -- and the prefix denotes System.
4516 return Scope
(Btyp
) = Scop
4517 or else (Scope
(Btyp
) = System_Aux_Id
4518 and then Scope
(Scope
(Btyp
)) = Scop
);
4521 end Is_Visible_Operation
;
4527 function Within
(Inner
, Outer
: Entity_Id
) return Boolean is
4531 Sc
:= Scope
(Inner
);
4532 while Sc
/= Standard_Standard
loop
4543 ---------------------
4544 -- Report_Overload --
4545 ---------------------
4547 function Report_Overload
return Entity_Id
is
4551 ("ambiguous actual subprogram&, " &
4552 "possible interpretations:", N
, Nam
);
4555 ("ambiguous subprogram, " &
4556 "possible interpretations:", N
);
4559 List_Interps
(Nam
, N
);
4561 end Report_Overload
;
4563 -- Start of processing for Find_Renamed_Entry
4567 Candidate_Renaming
:= Empty
;
4569 if not Is_Overloaded
(Nam
) then
4570 if Entity_Matches_Spec
(Entity
(Nam
), New_S
)
4571 and then Is_Visible_Operation
(Entity
(Nam
))
4573 Old_S
:= Entity
(Nam
);
4576 Present
(First_Formal
(Entity
(Nam
)))
4577 and then Present
(First_Formal
(New_S
))
4578 and then (Base_Type
(Etype
(First_Formal
(Entity
(Nam
))))
4579 = Base_Type
(Etype
(First_Formal
(New_S
))))
4581 Candidate_Renaming
:= Entity
(Nam
);
4585 Get_First_Interp
(Nam
, Ind
, It
);
4586 while Present
(It
.Nam
) loop
4587 if Entity_Matches_Spec
(It
.Nam
, New_S
)
4588 and then Is_Visible_Operation
(It
.Nam
)
4590 if Old_S
/= Any_Id
then
4592 -- Note: The call to Disambiguate only happens if a
4593 -- previous interpretation was found, in which case I1
4594 -- has received a value.
4596 It1
:= Disambiguate
(Nam
, I1
, Ind
, Etype
(Old_S
));
4598 if It1
= No_Interp
then
4599 Inst
:= Enclosing_Instance
;
4601 if Present
(Inst
) then
4602 if Within
(It
.Nam
, Inst
) then
4604 elsif Within
(Old_S
, Inst
) then
4607 return Report_Overload
;
4611 return Report_Overload
;
4625 Present
(First_Formal
(It
.Nam
))
4626 and then Present
(First_Formal
(New_S
))
4627 and then (Base_Type
(Etype
(First_Formal
(It
.Nam
)))
4628 = Base_Type
(Etype
(First_Formal
(New_S
))))
4630 Candidate_Renaming
:= It
.Nam
;
4633 Get_Next_Interp
(Ind
, It
);
4636 Set_Entity
(Nam
, Old_S
);
4637 Set_Is_Overloaded
(Nam
, False);
4641 end Find_Renamed_Entity
;
4643 -----------------------------
4644 -- Find_Selected_Component --
4645 -----------------------------
4647 procedure Find_Selected_Component
(N
: Node_Id
) is
4648 P
: constant Node_Id
:= Prefix
(N
);
4651 -- Entity denoted by prefix
4661 if Nkind
(P
) = N_Error
then
4664 -- If the selector already has an entity, the node has been constructed
4665 -- in the course of expansion, and is known to be valid. Do not verify
4666 -- that it is defined for the type (it may be a private component used
4667 -- in the expansion of record equality).
4669 elsif Present
(Entity
(Selector_Name
(N
))) then
4672 or else Etype
(N
) = Any_Type
4675 Sel_Name
: constant Node_Id
:= Selector_Name
(N
);
4676 Selector
: constant Entity_Id
:= Entity
(Sel_Name
);
4680 Set_Etype
(Sel_Name
, Etype
(Selector
));
4682 if not Is_Entity_Name
(P
) then
4686 -- Build an actual subtype except for the first parameter
4687 -- of an init proc, where this actual subtype is by
4688 -- definition incorrect, since the object is uninitialized
4689 -- (and does not even have defined discriminants etc.)
4691 if Is_Entity_Name
(P
)
4692 and then Ekind
(Entity
(P
)) = E_Function
4694 Nam
:= New_Copy
(P
);
4696 if Is_Overloaded
(P
) then
4697 Save_Interps
(P
, Nam
);
4701 Make_Function_Call
(Sloc
(P
), Name
=> Nam
));
4703 Analyze_Selected_Component
(N
);
4706 elsif Ekind
(Selector
) = E_Component
4707 and then (not Is_Entity_Name
(P
)
4708 or else Chars
(Entity
(P
)) /= Name_uInit
)
4711 Build_Actual_Subtype_Of_Component
(
4712 Etype
(Selector
), N
);
4717 if No
(C_Etype
) then
4718 C_Etype
:= Etype
(Selector
);
4720 Insert_Action
(N
, C_Etype
);
4721 C_Etype
:= Defining_Identifier
(C_Etype
);
4724 Set_Etype
(N
, C_Etype
);
4727 -- If this is the name of an entry or protected operation, and
4728 -- the prefix is an access type, insert an explicit dereference,
4729 -- so that entry calls are treated uniformly.
4731 if Is_Access_Type
(Etype
(P
))
4732 and then Is_Concurrent_Type
(Designated_Type
(Etype
(P
)))
4735 New_P
: constant Node_Id
:=
4736 Make_Explicit_Dereference
(Sloc
(P
),
4737 Prefix
=> Relocate_Node
(P
));
4740 Set_Etype
(P
, Designated_Type
(Etype
(Prefix
(P
))));
4744 -- If the selected component appears within a default expression
4745 -- and it has an actual subtype, the pre-analysis has not yet
4746 -- completed its analysis, because Insert_Actions is disabled in
4747 -- that context. Within the init proc of the enclosing type we
4748 -- must complete this analysis, if an actual subtype was created.
4750 elsif Inside_Init_Proc
then
4752 Typ
: constant Entity_Id
:= Etype
(N
);
4753 Decl
: constant Node_Id
:= Declaration_Node
(Typ
);
4755 if Nkind
(Decl
) = N_Subtype_Declaration
4756 and then not Analyzed
(Decl
)
4757 and then Is_List_Member
(Decl
)
4758 and then No
(Parent
(Decl
))
4761 Insert_Action
(N
, Decl
);
4768 elsif Is_Entity_Name
(P
) then
4769 P_Name
:= Entity
(P
);
4771 -- The prefix may denote an enclosing type which is the completion
4772 -- of an incomplete type declaration.
4774 if Is_Type
(P_Name
) then
4775 Set_Entity
(P
, Get_Full_View
(P_Name
));
4776 Set_Etype
(P
, Entity
(P
));
4777 P_Name
:= Entity
(P
);
4780 P_Type
:= Base_Type
(Etype
(P
));
4782 if Debug_Flag_E
then
4783 Write_Str
("Found prefix type to be ");
4784 Write_Entity_Info
(P_Type
, " "); Write_Eol
;
4787 -- First check for components of a record object (not the
4788 -- result of a call, which is handled below).
4790 if Is_Appropriate_For_Record
(P_Type
)
4791 and then not Is_Overloadable
(P_Name
)
4792 and then not Is_Type
(P_Name
)
4794 -- Selected component of record. Type checking will validate
4795 -- name of selector.
4796 -- ??? could we rewrite an implicit dereference into an explicit
4799 Analyze_Selected_Component
(N
);
4801 elsif Is_Appropriate_For_Entry_Prefix
(P_Type
)
4802 and then not In_Open_Scopes
(P_Name
)
4803 and then (not Is_Concurrent_Type
(Etype
(P_Name
))
4804 or else not In_Open_Scopes
(Etype
(P_Name
)))
4806 -- Call to protected operation or entry. Type checking is
4807 -- needed on the prefix.
4809 Analyze_Selected_Component
(N
);
4811 elsif (In_Open_Scopes
(P_Name
)
4812 and then Ekind
(P_Name
) /= E_Void
4813 and then not Is_Overloadable
(P_Name
))
4814 or else (Is_Concurrent_Type
(Etype
(P_Name
))
4815 and then In_Open_Scopes
(Etype
(P_Name
)))
4817 -- Prefix denotes an enclosing loop, block, or task, i.e. an
4818 -- enclosing construct that is not a subprogram or accept.
4820 Find_Expanded_Name
(N
);
4822 elsif Ekind
(P_Name
) = E_Package
then
4823 Find_Expanded_Name
(N
);
4825 elsif Is_Overloadable
(P_Name
) then
4827 -- The subprogram may be a renaming (of an enclosing scope) as
4828 -- in the case of the name of the generic within an instantiation.
4830 if (Ekind
(P_Name
) = E_Procedure
4831 or else Ekind
(P_Name
) = E_Function
)
4832 and then Present
(Alias
(P_Name
))
4833 and then Is_Generic_Instance
(Alias
(P_Name
))
4835 P_Name
:= Alias
(P_Name
);
4838 if Is_Overloaded
(P
) then
4840 -- The prefix must resolve to a unique enclosing construct
4843 Found
: Boolean := False;
4848 Get_First_Interp
(P
, Ind
, It
);
4849 while Present
(It
.Nam
) loop
4850 if In_Open_Scopes
(It
.Nam
) then
4853 "prefix must be unique enclosing scope", N
);
4854 Set_Entity
(N
, Any_Id
);
4855 Set_Etype
(N
, Any_Type
);
4864 Get_Next_Interp
(Ind
, It
);
4869 if In_Open_Scopes
(P_Name
) then
4870 Set_Entity
(P
, P_Name
);
4871 Set_Is_Overloaded
(P
, False);
4872 Find_Expanded_Name
(N
);
4875 -- If no interpretation as an expanded name is possible, it
4876 -- must be a selected component of a record returned by a
4877 -- function call. Reformat prefix as a function call, the rest
4878 -- is done by type resolution. If the prefix is procedure or
4879 -- entry, as is P.X; this is an error.
4881 if Ekind
(P_Name
) /= E_Function
4882 and then (not Is_Overloaded
(P
)
4884 Nkind
(Parent
(N
)) = N_Procedure_Call_Statement
)
4886 -- Prefix may mention a package that is hidden by a local
4887 -- declaration: let the user know. Scan the full homonym
4888 -- chain, the candidate package may be anywhere on it.
4890 if Present
(Homonym
(Current_Entity
(P_Name
))) then
4892 P_Name
:= Current_Entity
(P_Name
);
4894 while Present
(P_Name
) loop
4895 exit when Ekind
(P_Name
) = E_Package
;
4896 P_Name
:= Homonym
(P_Name
);
4899 if Present
(P_Name
) then
4900 Error_Msg_Sloc
:= Sloc
(Entity
(Prefix
(N
)));
4903 ("package& is hidden by declaration#",
4906 Set_Entity
(Prefix
(N
), P_Name
);
4907 Find_Expanded_Name
(N
);
4910 P_Name
:= Entity
(Prefix
(N
));
4915 ("invalid prefix in selected component&", N
, P_Name
);
4916 Change_Selected_Component_To_Expanded_Name
(N
);
4917 Set_Entity
(N
, Any_Id
);
4918 Set_Etype
(N
, Any_Type
);
4921 Nam
:= New_Copy
(P
);
4922 Save_Interps
(P
, Nam
);
4924 Make_Function_Call
(Sloc
(P
), Name
=> Nam
));
4926 Analyze_Selected_Component
(N
);
4930 -- Remaining cases generate various error messages
4933 -- Format node as expanded name, to avoid cascaded errors
4935 Change_Selected_Component_To_Expanded_Name
(N
);
4936 Set_Entity
(N
, Any_Id
);
4937 Set_Etype
(N
, Any_Type
);
4939 -- Issue error message, but avoid this if error issued already.
4940 -- Use identifier of prefix if one is available.
4942 if P_Name
= Any_Id
then
4945 elsif Ekind
(P_Name
) = E_Void
then
4946 Premature_Usage
(P
);
4948 elsif Nkind
(P
) /= N_Attribute_Reference
then
4950 "invalid prefix in selected component&", P
);
4952 if Is_Access_Type
(P_Type
)
4953 and then Ekind
(Designated_Type
(P_Type
)) = E_Incomplete_Type
4956 ("\dereference must not be of an incomplete type " &
4962 "invalid prefix in selected component", P
);
4967 -- If prefix is not the name of an entity, it must be an expression,
4968 -- whose type is appropriate for a record. This is determined by
4971 Analyze_Selected_Component
(N
);
4973 end Find_Selected_Component
;
4979 procedure Find_Type
(N
: Node_Id
) is
4989 elsif Nkind
(N
) = N_Attribute_Reference
then
4991 -- Class attribute. This is not valid in Ada 83 mode, but we do not
4992 -- need to enforce that at this point, since the declaration of the
4993 -- tagged type in the prefix would have been flagged already.
4995 if Attribute_Name
(N
) = Name_Class
then
4996 Check_Restriction
(No_Dispatch
, N
);
4997 Find_Type
(Prefix
(N
));
4999 -- Propagate error from bad prefix
5001 if Etype
(Prefix
(N
)) = Any_Type
then
5002 Set_Entity
(N
, Any_Type
);
5003 Set_Etype
(N
, Any_Type
);
5007 T
:= Base_Type
(Entity
(Prefix
(N
)));
5009 -- Case where type is not known to be tagged. Its appearance in
5010 -- the prefix of the 'Class attribute indicates that the full view
5013 if not Is_Tagged_Type
(T
) then
5014 if Ekind
(T
) = E_Incomplete_Type
then
5016 -- It is legal to denote the class type of an incomplete
5017 -- type. The full type will have to be tagged, of course.
5018 -- In Ada2005 this usage is declared obsolescent, so we
5019 -- warn accordingly.
5021 -- ??? This test is temporarily disabled (always False)
5022 -- because it causes an unwanted warning on GNAT sources
5023 -- (built with -gnatg, which includes Warn_On_Obsolescent_
5024 -- Feature). Once this issue is cleared in the sources, it
5027 if not Is_Tagged_Type
(T
)
5028 and then Ada_Version
>= Ada_05
5029 and then Warn_On_Obsolescent_Feature
5033 ("applying 'Class to an untagged imcomplete type"
5034 & " is an obsolescent feature (RM J.11)", N
);
5037 Set_Is_Tagged_Type
(T
);
5038 Set_Primitive_Operations
(T
, New_Elmt_List
);
5039 Make_Class_Wide_Type
(T
);
5040 Set_Entity
(N
, Class_Wide_Type
(T
));
5041 Set_Etype
(N
, Class_Wide_Type
(T
));
5043 elsif Ekind
(T
) = E_Private_Type
5044 and then not Is_Generic_Type
(T
)
5045 and then In_Private_Part
(Scope
(T
))
5047 -- The Class attribute can be applied to an untagged private
5048 -- type fulfilled by a tagged type prior to the full type
5049 -- declaration (but only within the parent package's private
5050 -- part). Create the class-wide type now and check that the
5051 -- full type is tagged later during its analysis. Note that
5052 -- we do not mark the private type as tagged, unlike the
5053 -- case of incomplete types, because the type must still
5054 -- appear untagged to outside units.
5056 if No
(Class_Wide_Type
(T
)) then
5057 Make_Class_Wide_Type
(T
);
5060 Set_Entity
(N
, Class_Wide_Type
(T
));
5061 Set_Etype
(N
, Class_Wide_Type
(T
));
5064 -- Should we introduce a type Any_Tagged and use Wrong_Type
5065 -- here, it would be a bit more consistent???
5068 ("tagged type required, found}",
5069 Prefix
(N
), First_Subtype
(T
));
5070 Set_Entity
(N
, Any_Type
);
5074 -- Case of tagged type
5077 if Is_Concurrent_Type
(T
) then
5078 if No
(Corresponding_Record_Type
(Entity
(Prefix
(N
)))) then
5080 -- Previous error. Use current type, which at least
5081 -- provides some operations.
5083 C
:= Entity
(Prefix
(N
));
5086 C
:= Class_Wide_Type
5087 (Corresponding_Record_Type
(Entity
(Prefix
(N
))));
5091 C
:= Class_Wide_Type
(Entity
(Prefix
(N
)));
5094 Set_Entity_With_Style_Check
(N
, C
);
5095 Generate_Reference
(C
, N
);
5099 -- Base attribute, not allowed in Ada 83
5101 elsif Attribute_Name
(N
) = Name_Base
then
5102 if Ada_Version
= Ada_83
and then Comes_From_Source
(N
) then
5104 ("(Ada 83) Base attribute not allowed in subtype mark", N
);
5107 Find_Type
(Prefix
(N
));
5108 Typ
:= Entity
(Prefix
(N
));
5110 if Ada_Version
>= Ada_95
5111 and then not Is_Scalar_Type
(Typ
)
5112 and then not Is_Generic_Type
(Typ
)
5115 ("prefix of Base attribute must be scalar type",
5118 elsif Sloc
(Typ
) = Standard_Location
5119 and then Base_Type
(Typ
) = Typ
5120 and then Warn_On_Redundant_Constructs
5123 ("?redudant attribute, & is its own base type", N
, Typ
);
5126 T
:= Base_Type
(Typ
);
5128 -- Rewrite attribute reference with type itself (see similar
5129 -- processing in Analyze_Attribute, case Base). Preserve
5130 -- prefix if present, for other legality checks.
5132 if Nkind
(Prefix
(N
)) = N_Expanded_Name
then
5134 Make_Expanded_Name
(Sloc
(N
),
5136 Prefix
=> New_Copy
(Prefix
(Prefix
(N
))),
5137 Selector_Name
=> New_Reference_To
(T
, Sloc
(N
))));
5140 Rewrite
(N
, New_Reference_To
(T
, Sloc
(N
)));
5147 elsif Attribute_Name
(N
) = Name_Stub_Type
then
5149 -- This is handled in Analyze_Attribute
5153 -- All other attributes are invalid in a subtype mark
5156 Error_Msg_N
("invalid attribute in subtype mark", N
);
5162 if Is_Entity_Name
(N
) then
5163 T_Name
:= Entity
(N
);
5165 Error_Msg_N
("subtype mark required in this context", N
);
5166 Set_Etype
(N
, Any_Type
);
5170 if T_Name
= Any_Id
or else Etype
(N
) = Any_Type
then
5172 -- Undefined id. Make it into a valid type
5174 Set_Entity
(N
, Any_Type
);
5176 elsif not Is_Type
(T_Name
)
5177 and then T_Name
/= Standard_Void_Type
5179 Error_Msg_Sloc
:= Sloc
(T_Name
);
5180 Error_Msg_N
("subtype mark required in this context", N
);
5181 Error_Msg_NE
("\\found & declared#", N
, T_Name
);
5182 Set_Entity
(N
, Any_Type
);
5185 -- If the type is an incomplete type created to handle
5186 -- anonymous access components of a record type, then the
5187 -- incomplete type is the visible entity and subsequent
5188 -- references will point to it. Mark the original full
5189 -- type as referenced, to prevent spurious warnings.
5191 if Is_Incomplete_Type
(T_Name
)
5192 and then Present
(Full_View
(T_Name
))
5193 and then not Comes_From_Source
(T_Name
)
5195 Set_Referenced
(Full_View
(T_Name
));
5198 T_Name
:= Get_Full_View
(T_Name
);
5200 -- Ada 2005 (AI-251, AI-50217): Handle interfaces visible through
5201 -- limited-with clauses
5203 if From_With_Type
(T_Name
)
5204 and then Ekind
(T_Name
) in Incomplete_Kind
5205 and then Present
(Non_Limited_View
(T_Name
))
5206 and then Is_Interface
(Non_Limited_View
(T_Name
))
5208 T_Name
:= Non_Limited_View
(T_Name
);
5211 if In_Open_Scopes
(T_Name
) then
5212 if Ekind
(Base_Type
(T_Name
)) = E_Task_Type
then
5214 -- In Ada 2005, a task name can be used in an access
5215 -- definition within its own body.
5217 if Ada_Version
>= Ada_05
5218 and then Nkind
(Parent
(N
)) = N_Access_Definition
5220 Set_Entity
(N
, T_Name
);
5221 Set_Etype
(N
, T_Name
);
5226 ("task type cannot be used as type mark " &
5227 "within its own spec or body", N
);
5230 elsif Ekind
(Base_Type
(T_Name
)) = E_Protected_Type
then
5232 -- In Ada 2005, a protected name can be used in an access
5233 -- definition within its own body.
5235 if Ada_Version
>= Ada_05
5236 and then Nkind
(Parent
(N
)) = N_Access_Definition
5238 Set_Entity
(N
, T_Name
);
5239 Set_Etype
(N
, T_Name
);
5244 ("protected type cannot be used as type mark " &
5245 "within its own spec or body", N
);
5249 Error_Msg_N
("type declaration cannot refer to itself", N
);
5252 Set_Etype
(N
, Any_Type
);
5253 Set_Entity
(N
, Any_Type
);
5254 Set_Error_Posted
(T_Name
);
5258 Set_Entity
(N
, T_Name
);
5259 Set_Etype
(N
, T_Name
);
5263 if Present
(Etype
(N
)) and then Comes_From_Source
(N
) then
5264 if Is_Fixed_Point_Type
(Etype
(N
)) then
5265 Check_Restriction
(No_Fixed_Point
, N
);
5266 elsif Is_Floating_Point_Type
(Etype
(N
)) then
5267 Check_Restriction
(No_Floating_Point
, N
);
5272 ------------------------------------
5273 -- Has_Implicit_Character_Literal --
5274 ------------------------------------
5276 function Has_Implicit_Character_Literal
(N
: Node_Id
) return Boolean is
5278 Found
: Boolean := False;
5279 P
: constant Entity_Id
:= Entity
(Prefix
(N
));
5280 Priv_Id
: Entity_Id
:= Empty
;
5283 if Ekind
(P
) = E_Package
5284 and then not In_Open_Scopes
(P
)
5286 Priv_Id
:= First_Private_Entity
(P
);
5289 if P
= Standard_Standard
then
5290 Change_Selected_Component_To_Expanded_Name
(N
);
5291 Rewrite
(N
, Selector_Name
(N
));
5293 Set_Etype
(Original_Node
(N
), Standard_Character
);
5297 Id
:= First_Entity
(P
);
5300 and then Id
/= Priv_Id
5302 if Is_Character_Type
(Id
)
5303 and then (Root_Type
(Id
) = Standard_Character
5304 or else Root_Type
(Id
) = Standard_Wide_Character
5305 or else Root_Type
(Id
) = Standard_Wide_Wide_Character
)
5306 and then Id
= Base_Type
(Id
)
5308 -- We replace the node with the literal itself, resolve as a
5309 -- character, and set the type correctly.
5312 Change_Selected_Component_To_Expanded_Name
(N
);
5313 Rewrite
(N
, Selector_Name
(N
));
5316 Set_Etype
(Original_Node
(N
), Id
);
5320 -- More than one type derived from Character in given scope.
5321 -- Collect all possible interpretations.
5323 Add_One_Interp
(N
, Id
, Id
);
5331 end Has_Implicit_Character_Literal
;
5333 ----------------------
5334 -- Has_Private_With --
5335 ----------------------
5337 function Has_Private_With
(E
: Entity_Id
) return Boolean is
5338 Comp_Unit
: constant Node_Id
:= Cunit
(Current_Sem_Unit
);
5342 Item
:= First
(Context_Items
(Comp_Unit
));
5343 while Present
(Item
) loop
5344 if Nkind
(Item
) = N_With_Clause
5345 and then Private_Present
(Item
)
5346 and then Entity
(Name
(Item
)) = E
5355 end Has_Private_With
;
5357 ---------------------------
5358 -- Has_Implicit_Operator --
5359 ---------------------------
5361 function Has_Implicit_Operator
(N
: Node_Id
) return Boolean is
5362 Op_Id
: constant Name_Id
:= Chars
(Selector_Name
(N
));
5363 P
: constant Entity_Id
:= Entity
(Prefix
(N
));
5365 Priv_Id
: Entity_Id
:= Empty
;
5367 procedure Add_Implicit_Operator
5369 Op_Type
: Entity_Id
:= Empty
);
5370 -- Add implicit interpretation to node N, using the type for which a
5371 -- predefined operator exists. If the operator yields a boolean type,
5372 -- the Operand_Type is implicitly referenced by the operator, and a
5373 -- reference to it must be generated.
5375 ---------------------------
5376 -- Add_Implicit_Operator --
5377 ---------------------------
5379 procedure Add_Implicit_Operator
5381 Op_Type
: Entity_Id
:= Empty
)
5383 Predef_Op
: Entity_Id
;
5386 Predef_Op
:= Current_Entity
(Selector_Name
(N
));
5388 while Present
(Predef_Op
)
5389 and then Scope
(Predef_Op
) /= Standard_Standard
5391 Predef_Op
:= Homonym
(Predef_Op
);
5394 if Nkind
(N
) = N_Selected_Component
then
5395 Change_Selected_Component_To_Expanded_Name
(N
);
5398 Add_One_Interp
(N
, Predef_Op
, T
);
5400 -- For operators with unary and binary interpretations, add both
5402 if Present
(Homonym
(Predef_Op
)) then
5403 Add_One_Interp
(N
, Homonym
(Predef_Op
), T
);
5406 -- The node is a reference to a predefined operator, and
5407 -- an implicit reference to the type of its operands.
5409 if Present
(Op_Type
) then
5410 Generate_Operator_Reference
(N
, Op_Type
);
5412 Generate_Operator_Reference
(N
, T
);
5414 end Add_Implicit_Operator
;
5416 -- Start of processing for Has_Implicit_Operator
5419 if Ekind
(P
) = E_Package
5420 and then not In_Open_Scopes
(P
)
5422 Priv_Id
:= First_Private_Entity
(P
);
5425 Id
:= First_Entity
(P
);
5429 -- Boolean operators: an implicit declaration exists if the scope
5430 -- contains a declaration for a derived Boolean type, or for an
5431 -- array of Boolean type.
5433 when Name_Op_And | Name_Op_Not | Name_Op_Or | Name_Op_Xor
=>
5434 while Id
/= Priv_Id
loop
5435 if Valid_Boolean_Arg
(Id
)
5436 and then Id
= Base_Type
(Id
)
5438 Add_Implicit_Operator
(Id
);
5445 -- Equality: look for any non-limited type (result is Boolean)
5447 when Name_Op_Eq | Name_Op_Ne
=>
5448 while Id
/= Priv_Id
loop
5450 and then not Is_Limited_Type
(Id
)
5451 and then Id
= Base_Type
(Id
)
5453 Add_Implicit_Operator
(Standard_Boolean
, Id
);
5460 -- Comparison operators: scalar type, or array of scalar
5462 when Name_Op_Lt | Name_Op_Le | Name_Op_Gt | Name_Op_Ge
=>
5463 while Id
/= Priv_Id
loop
5464 if (Is_Scalar_Type
(Id
)
5465 or else (Is_Array_Type
(Id
)
5466 and then Is_Scalar_Type
(Component_Type
(Id
))))
5467 and then Id
= Base_Type
(Id
)
5469 Add_Implicit_Operator
(Standard_Boolean
, Id
);
5476 -- Arithmetic operators: any numeric type
5486 while Id
/= Priv_Id
loop
5487 if Is_Numeric_Type
(Id
)
5488 and then Id
= Base_Type
(Id
)
5490 Add_Implicit_Operator
(Id
);
5497 -- Concatenation: any one-dimensional array type
5499 when Name_Op_Concat
=>
5500 while Id
/= Priv_Id
loop
5501 if Is_Array_Type
(Id
) and then Number_Dimensions
(Id
) = 1
5502 and then Id
= Base_Type
(Id
)
5504 Add_Implicit_Operator
(Id
);
5511 -- What is the others condition here? Should we be using a
5512 -- subtype of Name_Id that would restrict to operators ???
5514 when others => null;
5517 -- If we fall through, then we do not have an implicit operator
5521 end Has_Implicit_Operator
;
5523 --------------------
5524 -- In_Open_Scopes --
5525 --------------------
5527 function In_Open_Scopes
(S
: Entity_Id
) return Boolean is
5529 -- Several scope stacks are maintained by Scope_Stack. The base of the
5530 -- currently active scope stack is denoted by the Is_Active_Stack_Base
5531 -- flag in the scope stack entry. Note that the scope stacks used to
5532 -- simply be delimited implicitly by the presence of Standard_Standard
5533 -- at their base, but there now are cases where this is not sufficient
5534 -- because Standard_Standard actually may appear in the middle of the
5535 -- active set of scopes.
5537 for J
in reverse 0 .. Scope_Stack
.Last
loop
5538 if Scope_Stack
.Table
(J
).Entity
= S
then
5542 -- Check Is_Active_Stack_Base to tell us when to stop, as there are
5543 -- cases where Standard_Standard appears in the middle of the active
5544 -- set of scopes. This affects the declaration and overriding of
5545 -- private inherited operations in instantiations of generic child
5548 exit when Scope_Stack
.Table
(J
).Is_Active_Stack_Base
;
5554 -----------------------------
5555 -- Inherit_Renamed_Profile --
5556 -----------------------------
5558 procedure Inherit_Renamed_Profile
(New_S
: Entity_Id
; Old_S
: Entity_Id
) is
5565 if Ekind
(Old_S
) = E_Operator
then
5566 New_F
:= First_Formal
(New_S
);
5568 while Present
(New_F
) loop
5569 Set_Etype
(New_F
, Base_Type
(Etype
(New_F
)));
5570 Next_Formal
(New_F
);
5573 Set_Etype
(New_S
, Base_Type
(Etype
(New_S
)));
5576 New_F
:= First_Formal
(New_S
);
5577 Old_F
:= First_Formal
(Old_S
);
5579 while Present
(New_F
) loop
5580 New_T
:= Etype
(New_F
);
5581 Old_T
:= Etype
(Old_F
);
5583 -- If the new type is a renaming of the old one, as is the
5584 -- case for actuals in instances, retain its name, to simplify
5585 -- later disambiguation.
5587 if Nkind
(Parent
(New_T
)) = N_Subtype_Declaration
5588 and then Is_Entity_Name
(Subtype_Indication
(Parent
(New_T
)))
5589 and then Entity
(Subtype_Indication
(Parent
(New_T
))) = Old_T
5593 Set_Etype
(New_F
, Old_T
);
5596 Next_Formal
(New_F
);
5597 Next_Formal
(Old_F
);
5600 if Ekind
(Old_S
) = E_Function
5601 or else Ekind
(Old_S
) = E_Enumeration_Literal
5603 Set_Etype
(New_S
, Etype
(Old_S
));
5606 end Inherit_Renamed_Profile
;
5612 procedure Initialize
is
5617 -------------------------
5618 -- Install_Use_Clauses --
5619 -------------------------
5621 procedure Install_Use_Clauses
5623 Force_Installation
: Boolean := False)
5631 while Present
(U
) loop
5633 -- Case of USE package
5635 if Nkind
(U
) = N_Use_Package_Clause
then
5636 P
:= First
(Names
(U
));
5637 while Present
(P
) loop
5640 if Ekind
(Id
) = E_Package
then
5642 Note_Redundant_Use
(P
);
5644 elsif Present
(Renamed_Object
(Id
))
5645 and then In_Use
(Renamed_Object
(Id
))
5647 Note_Redundant_Use
(P
);
5649 elsif Force_Installation
or else Applicable_Use
(P
) then
5650 Use_One_Package
(Id
, U
);
5661 P
:= First
(Subtype_Marks
(U
));
5662 while Present
(P
) loop
5663 if not Is_Entity_Name
(P
)
5664 or else No
(Entity
(P
))
5668 elsif Entity
(P
) /= Any_Type
then
5676 Next_Use_Clause
(U
);
5678 end Install_Use_Clauses
;
5680 -------------------------------------
5681 -- Is_Appropriate_For_Entry_Prefix --
5682 -------------------------------------
5684 function Is_Appropriate_For_Entry_Prefix
(T
: Entity_Id
) return Boolean is
5685 P_Type
: Entity_Id
:= T
;
5688 if Is_Access_Type
(P_Type
) then
5689 P_Type
:= Designated_Type
(P_Type
);
5692 return Is_Task_Type
(P_Type
) or else Is_Protected_Type
(P_Type
);
5693 end Is_Appropriate_For_Entry_Prefix
;
5695 -------------------------------
5696 -- Is_Appropriate_For_Record --
5697 -------------------------------
5699 function Is_Appropriate_For_Record
(T
: Entity_Id
) return Boolean is
5701 function Has_Components
(T1
: Entity_Id
) return Boolean;
5702 -- Determine if given type has components (i.e. is either a record
5703 -- type or a type that has discriminants).
5705 --------------------
5706 -- Has_Components --
5707 --------------------
5709 function Has_Components
(T1
: Entity_Id
) return Boolean is
5711 return Is_Record_Type
(T1
)
5712 or else (Is_Private_Type
(T1
) and then Has_Discriminants
(T1
))
5713 or else (Is_Task_Type
(T1
) and then Has_Discriminants
(T1
))
5714 or else (Is_Incomplete_Type
(T1
)
5715 and then From_With_Type
(T1
)
5716 and then Present
(Non_Limited_View
(T1
))
5717 and then Is_Record_Type
5718 (Get_Full_View
(Non_Limited_View
(T1
))));
5721 -- Start of processing for Is_Appropriate_For_Record
5726 and then (Has_Components
(T
)
5727 or else (Is_Access_Type
(T
)
5728 and then Has_Components
(Designated_Type
(T
))));
5729 end Is_Appropriate_For_Record
;
5731 ------------------------
5732 -- Note_Redundant_Use --
5733 ------------------------
5735 procedure Note_Redundant_Use
(Clause
: Node_Id
) is
5736 Pack_Name
: constant Entity_Id
:= Entity
(Clause
);
5737 Cur_Use
: constant Node_Id
:= Current_Use_Clause
(Pack_Name
);
5738 Decl
: constant Node_Id
:= Parent
(Clause
);
5740 Prev_Use
: Node_Id
:= Empty
;
5741 Redundant
: Node_Id
:= Empty
;
5742 -- The Use_Clause which is actually redundant. In the simplest case
5743 -- it is Pack itself, but when we compile a body we install its
5744 -- context before that of its spec, in which case it is the use_clause
5745 -- in the spec that will appear to be redundant, and we want the
5746 -- warning to be placed on the body. Similar complications appear when
5747 -- the redundancy is between a child unit and one of its ancestors.
5750 Set_Redundant_Use
(Clause
, True);
5752 if not Comes_From_Source
(Clause
)
5754 or else not Warn_On_Redundant_Constructs
5759 if not Is_Compilation_Unit
(Current_Scope
) then
5761 -- If the use_clause is in an inner scope, it is made redundant
5762 -- by some clause in the current context, with one exception:
5763 -- If we're compiling a nested package body, and the use_clause
5764 -- comes from the corresponding spec, the clause is not necessarily
5765 -- fully redundant, so we should not warn. If a warning was
5766 -- warranted, it would have been given when the spec was processed.
5768 if Nkind
(Parent
(Decl
)) = N_Package_Specification
then
5770 Package_Spec_Entity
: constant Entity_Id
:=
5771 Defining_Unit_Name
(Parent
(Decl
));
5773 if In_Package_Body
(Package_Spec_Entity
) then
5779 Redundant
:= Clause
;
5780 Prev_Use
:= Cur_Use
;
5782 elsif Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
then
5784 Cur_Unit
: constant Unit_Number_Type
:= Get_Source_Unit
(Cur_Use
);
5785 New_Unit
: constant Unit_Number_Type
:= Get_Source_Unit
(Clause
);
5789 if Cur_Unit
= New_Unit
then
5791 -- Redundant clause in same body
5793 Redundant
:= Clause
;
5794 Prev_Use
:= Cur_Use
;
5796 elsif Cur_Unit
= Current_Sem_Unit
then
5798 -- If the new clause is not in the current unit it has been
5799 -- analyzed first, and it makes the other one redundant.
5800 -- However, if the new clause appears in a subunit, Cur_Unit
5801 -- is still the parent, and in that case the redundant one
5802 -- is the one appearing in the subunit.
5804 if Nkind
(Unit
(Cunit
(New_Unit
))) = N_Subunit
then
5805 Redundant
:= Clause
;
5806 Prev_Use
:= Cur_Use
;
5808 -- Most common case: redundant clause in body,
5809 -- original clause in spec. Current scope is spec entity.
5814 Unit
(Library_Unit
(Cunit
(Current_Sem_Unit
))))
5816 Redundant
:= Cur_Use
;
5820 -- The new clause may appear in an unrelated unit, when
5821 -- the parents of a generic are being installed prior to
5822 -- instantiation. In this case there must be no warning.
5823 -- We detect this case by checking whether the current top
5824 -- of the stack is related to the current compilation.
5826 Scop
:= Current_Scope
;
5827 while Present
(Scop
)
5828 and then Scop
/= Standard_Standard
5830 if Is_Compilation_Unit
(Scop
)
5831 and then not Is_Child_Unit
(Scop
)
5835 elsif Scop
= Cunit_Entity
(Current_Sem_Unit
) then
5839 Scop
:= Scope
(Scop
);
5842 Redundant
:= Cur_Use
;
5846 elsif New_Unit
= Current_Sem_Unit
then
5847 Redundant
:= Clause
;
5848 Prev_Use
:= Cur_Use
;
5851 -- Neither is the current unit, so they appear in parent or
5852 -- sibling units. Warning will be emitted elsewhere.
5858 elsif Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Declaration
5859 and then Present
(Parent_Spec
(Unit
(Cunit
(Current_Sem_Unit
))))
5861 -- Use_clause is in child unit of current unit, and the child
5862 -- unit appears in the context of the body of the parent, so it
5863 -- has been installed first, even though it is the redundant one.
5864 -- Depending on their placement in the context, the visible or the
5865 -- private parts of the two units, either might appear as redundant,
5866 -- but the message has to be on the current unit.
5868 if Get_Source_Unit
(Cur_Use
) = Current_Sem_Unit
then
5869 Redundant
:= Cur_Use
;
5872 Redundant
:= Clause
;
5873 Prev_Use
:= Cur_Use
;
5876 -- If the new use clause appears in the private part of a parent unit
5877 -- it may appear to be redudant w.r.t. a use clause in a child unit,
5878 -- but the previous use clause was needed in the visible part of the
5879 -- child, and no warning should be emitted.
5881 if Nkind
(Parent
(Decl
)) = N_Package_Specification
5883 List_Containing
(Decl
) = Private_Declarations
(Parent
(Decl
))
5886 Par
: constant Entity_Id
:= Defining_Entity
(Parent
(Decl
));
5887 Spec
: constant Node_Id
:=
5888 Specification
(Unit
(Cunit
(Current_Sem_Unit
)));
5891 if Is_Compilation_Unit
(Par
)
5892 and then Par
/= Cunit_Entity
(Current_Sem_Unit
)
5893 and then Parent
(Cur_Use
) = Spec
5895 List_Containing
(Cur_Use
) = Visible_Declarations
(Spec
)
5906 if Present
(Redundant
) then
5907 Error_Msg_Sloc
:= Sloc
(Prev_Use
);
5909 ("& is already use-visible through previous use clause #?",
5910 Redundant
, Pack_Name
);
5912 end Note_Redundant_Use
;
5918 procedure Pop_Scope
is
5919 SST
: Scope_Stack_Entry
renames Scope_Stack
.Table
(Scope_Stack
.Last
);
5922 if Debug_Flag_E
then
5926 Scope_Suppress
:= SST
.Save_Scope_Suppress
;
5927 Local_Suppress_Stack_Top
:= SST
.Save_Local_Suppress_Stack_Top
;
5929 if Debug_Flag_W
then
5930 Write_Str
("--> exiting scope: ");
5931 Write_Name
(Chars
(Current_Scope
));
5932 Write_Str
(", Depth=");
5933 Write_Int
(Int
(Scope_Stack
.Last
));
5937 End_Use_Clauses
(SST
.First_Use_Clause
);
5939 -- If the actions to be wrapped are still there they will get lost
5940 -- causing incomplete code to be generated. It is better to abort in
5941 -- this case (and we do the abort even with assertions off since the
5942 -- penalty is incorrect code generation)
5944 if SST
.Actions_To_Be_Wrapped_Before
/= No_List
5946 SST
.Actions_To_Be_Wrapped_After
/= No_List
5951 -- Free last subprogram name if allocated, and pop scope
5953 Free
(SST
.Last_Subprogram_Name
);
5954 Scope_Stack
.Decrement_Last
;
5961 procedure Push_Scope
(S
: Entity_Id
) is
5965 if Ekind
(S
) = E_Void
then
5968 -- Set scope depth if not a non-concurrent type, and we have not
5969 -- yet set the scope depth. This means that we have the first
5970 -- occurrence of the scope, and this is where the depth is set.
5972 elsif (not Is_Type
(S
) or else Is_Concurrent_Type
(S
))
5973 and then not Scope_Depth_Set
(S
)
5975 if S
= Standard_Standard
then
5976 Set_Scope_Depth_Value
(S
, Uint_0
);
5978 elsif Is_Child_Unit
(S
) then
5979 Set_Scope_Depth_Value
(S
, Uint_1
);
5981 elsif not Is_Record_Type
(Current_Scope
) then
5982 if Ekind
(S
) = E_Loop
then
5983 Set_Scope_Depth_Value
(S
, Scope_Depth
(Current_Scope
));
5985 Set_Scope_Depth_Value
(S
, Scope_Depth
(Current_Scope
) + 1);
5990 Scope_Stack
.Increment_Last
;
5993 SST
: Scope_Stack_Entry
renames Scope_Stack
.Table
(Scope_Stack
.Last
);
5997 SST
.Save_Scope_Suppress
:= Scope_Suppress
;
5998 SST
.Save_Local_Suppress_Stack_Top
:= Local_Suppress_Stack_Top
;
6000 if Scope_Stack
.Last
> Scope_Stack
.First
then
6001 SST
.Component_Alignment_Default
:= Scope_Stack
.Table
6002 (Scope_Stack
.Last
- 1).
6003 Component_Alignment_Default
;
6006 SST
.Last_Subprogram_Name
:= null;
6007 SST
.Is_Transient
:= False;
6008 SST
.Node_To_Be_Wrapped
:= Empty
;
6009 SST
.Pending_Freeze_Actions
:= No_List
;
6010 SST
.Actions_To_Be_Wrapped_Before
:= No_List
;
6011 SST
.Actions_To_Be_Wrapped_After
:= No_List
;
6012 SST
.First_Use_Clause
:= Empty
;
6013 SST
.Is_Active_Stack_Base
:= False;
6014 SST
.Previous_Visibility
:= False;
6017 if Debug_Flag_W
then
6018 Write_Str
("--> new scope: ");
6019 Write_Name
(Chars
(Current_Scope
));
6020 Write_Str
(", Id=");
6021 Write_Int
(Int
(Current_Scope
));
6022 Write_Str
(", Depth=");
6023 Write_Int
(Int
(Scope_Stack
.Last
));
6027 -- Deal with copying flags from the previous scope to this one. This
6028 -- is not necessary if either scope is standard, or if the new scope
6031 if S
/= Standard_Standard
6032 and then Scope
(S
) /= Standard_Standard
6033 and then not Is_Child_Unit
(S
)
6037 if Nkind
(E
) not in N_Entity
then
6041 -- Copy categorization flags from Scope (S) to S, this is not done
6042 -- when Scope (S) is Standard_Standard since propagation is from
6043 -- library unit entity inwards. Copy other relevant attributes as
6044 -- well (Discard_Names in particular).
6046 -- We only propagate inwards for library level entities,
6047 -- inner level subprograms do not inherit the categorization.
6049 if Is_Library_Level_Entity
(S
) then
6050 Set_Is_Preelaborated
(S
, Is_Preelaborated
(E
));
6051 Set_Is_Shared_Passive
(S
, Is_Shared_Passive
(E
));
6052 Set_Discard_Names
(S
, Discard_Names
(E
));
6053 Set_Suppress_Value_Tracking_On_Call
6054 (S
, Suppress_Value_Tracking_On_Call
(E
));
6055 Set_Categorization_From_Scope
(E
=> S
, Scop
=> E
);
6060 ---------------------
6061 -- Premature_Usage --
6062 ---------------------
6064 procedure Premature_Usage
(N
: Node_Id
) is
6065 Kind
: constant Node_Kind
:= Nkind
(Parent
(Entity
(N
)));
6066 E
: Entity_Id
:= Entity
(N
);
6069 -- Within an instance, the analysis of the actual for a formal object
6070 -- does not see the name of the object itself. This is significant only
6071 -- if the object is an aggregate, where its analysis does not do any
6072 -- name resolution on component associations. (see 4717-008). In such a
6073 -- case, look for the visible homonym on the chain.
6076 and then Present
(Homonym
(E
))
6081 and then not In_Open_Scopes
(Scope
(E
))
6088 Set_Etype
(N
, Etype
(E
));
6093 if Kind
= N_Component_Declaration
then
6095 ("component&! cannot be used before end of record declaration", N
);
6097 elsif Kind
= N_Parameter_Specification
then
6099 ("formal parameter&! cannot be used before end of specification",
6102 elsif Kind
= N_Discriminant_Specification
then
6104 ("discriminant&! cannot be used before end of discriminant part",
6107 elsif Kind
= N_Procedure_Specification
6108 or else Kind
= N_Function_Specification
6111 ("subprogram&! cannot be used before end of its declaration",
6115 ("object& cannot be used before end of its declaration!", N
);
6117 end Premature_Usage
;
6119 ------------------------
6120 -- Present_System_Aux --
6121 ------------------------
6123 function Present_System_Aux
(N
: Node_Id
:= Empty
) return Boolean is
6125 Aux_Name
: Unit_Name_Type
;
6126 Unum
: Unit_Number_Type
;
6131 function Find_System
(C_Unit
: Node_Id
) return Entity_Id
;
6132 -- Scan context clause of compilation unit to find with_clause
6139 function Find_System
(C_Unit
: Node_Id
) return Entity_Id
is
6140 With_Clause
: Node_Id
;
6143 With_Clause
:= First
(Context_Items
(C_Unit
));
6144 while Present
(With_Clause
) loop
6145 if (Nkind
(With_Clause
) = N_With_Clause
6146 and then Chars
(Name
(With_Clause
)) = Name_System
)
6147 and then Comes_From_Source
(With_Clause
)
6158 -- Start of processing for Present_System_Aux
6161 -- The child unit may have been loaded and analyzed already
6163 if Present
(System_Aux_Id
) then
6166 -- If no previous pragma for System.Aux, nothing to load
6168 elsif No
(System_Extend_Unit
) then
6171 -- Use the unit name given in the pragma to retrieve the unit.
6172 -- Verify that System itself appears in the context clause of the
6173 -- current compilation. If System is not present, an error will
6174 -- have been reported already.
6177 With_Sys
:= Find_System
(Cunit
(Current_Sem_Unit
));
6179 The_Unit
:= Unit
(Cunit
(Current_Sem_Unit
));
6182 and then (Nkind
(The_Unit
) = N_Package_Body
6183 or else (Nkind
(The_Unit
) = N_Subprogram_Body
6184 and then not Acts_As_Spec
(Cunit
(Current_Sem_Unit
))))
6186 With_Sys
:= Find_System
(Library_Unit
(Cunit
(Current_Sem_Unit
)));
6190 and then Present
(N
)
6192 -- If we are compiling a subunit, we need to examine its
6193 -- context as well (Current_Sem_Unit is the parent unit);
6195 The_Unit
:= Parent
(N
);
6197 while Nkind
(The_Unit
) /= N_Compilation_Unit
loop
6198 The_Unit
:= Parent
(The_Unit
);
6201 if Nkind
(Unit
(The_Unit
)) = N_Subunit
then
6202 With_Sys
:= Find_System
(The_Unit
);
6206 if No
(With_Sys
) then
6210 Loc
:= Sloc
(With_Sys
);
6211 Get_Name_String
(Chars
(Expression
(System_Extend_Unit
)));
6212 Name_Buffer
(8 .. Name_Len
+ 7) := Name_Buffer
(1 .. Name_Len
);
6213 Name_Buffer
(1 .. 7) := "system.";
6214 Name_Buffer
(Name_Len
+ 8) := '%';
6215 Name_Buffer
(Name_Len
+ 9) := 's';
6216 Name_Len
:= Name_Len
+ 9;
6217 Aux_Name
:= Name_Find
;
6221 (Load_Name
=> Aux_Name
,
6224 Error_Node
=> With_Sys
);
6226 if Unum
/= No_Unit
then
6227 Semantics
(Cunit
(Unum
));
6229 Defining_Entity
(Specification
(Unit
(Cunit
(Unum
))));
6232 Make_With_Clause
(Loc
,
6234 Make_Expanded_Name
(Loc
,
6235 Chars
=> Chars
(System_Aux_Id
),
6236 Prefix
=> New_Reference_To
(Scope
(System_Aux_Id
), Loc
),
6237 Selector_Name
=> New_Reference_To
(System_Aux_Id
, Loc
)));
6239 Set_Entity
(Name
(Withn
), System_Aux_Id
);
6241 Set_Library_Unit
(Withn
, Cunit
(Unum
));
6242 Set_Corresponding_Spec
(Withn
, System_Aux_Id
);
6243 Set_First_Name
(Withn
, True);
6244 Set_Implicit_With
(Withn
, True);
6246 Insert_After
(With_Sys
, Withn
);
6247 Mark_Rewrite_Insertion
(Withn
);
6248 Set_Context_Installed
(Withn
);
6252 -- Here if unit load failed
6255 Error_Msg_Name_1
:= Name_System
;
6256 Error_Msg_Name_2
:= Chars
(Expression
(System_Extend_Unit
));
6258 ("extension package `%.%` does not exist",
6259 Opt
.System_Extend_Unit
);
6263 end Present_System_Aux
;
6265 -------------------------
6266 -- Restore_Scope_Stack --
6267 -------------------------
6269 procedure Restore_Scope_Stack
(Handle_Use
: Boolean := True) is
6272 Comp_Unit
: Node_Id
;
6273 In_Child
: Boolean := False;
6274 Full_Vis
: Boolean := True;
6275 SS_Last
: constant Int
:= Scope_Stack
.Last
;
6278 -- Restore visibility of previous scope stack, if any
6280 for J
in reverse 0 .. Scope_Stack
.Last
loop
6281 exit when Scope_Stack
.Table
(J
).Entity
= Standard_Standard
6282 or else No
(Scope_Stack
.Table
(J
).Entity
);
6284 S
:= Scope_Stack
.Table
(J
).Entity
;
6286 if not Is_Hidden_Open_Scope
(S
) then
6288 -- If the parent scope is hidden, its entities are hidden as
6289 -- well, unless the entity is the instantiation currently
6292 if not Is_Hidden_Open_Scope
(Scope
(S
))
6293 or else not Analyzed
(Parent
(S
))
6294 or else Scope
(S
) = Standard_Standard
6296 Set_Is_Immediately_Visible
(S
, True);
6299 E
:= First_Entity
(S
);
6300 while Present
(E
) loop
6301 if Is_Child_Unit
(E
) then
6302 Set_Is_Immediately_Visible
(E
,
6303 Is_Visible_Child_Unit
(E
) or else In_Open_Scopes
(E
));
6305 Set_Is_Immediately_Visible
(E
, True);
6310 if not Full_Vis
then
6311 exit when E
= First_Private_Entity
(S
);
6315 -- The visibility of child units (siblings of current compilation)
6316 -- must be restored in any case. Their declarations may appear
6317 -- after the private part of the parent.
6319 if not Full_Vis
then
6320 while Present
(E
) loop
6321 if Is_Child_Unit
(E
) then
6322 Set_Is_Immediately_Visible
(E
,
6323 Is_Visible_Child_Unit
(E
) or else In_Open_Scopes
(E
));
6331 if Is_Child_Unit
(S
)
6332 and not In_Child
-- check only for current unit
6336 -- Restore visibility of parents according to whether the child
6337 -- is private and whether we are in its visible part.
6339 Comp_Unit
:= Parent
(Unit_Declaration_Node
(S
));
6341 if Nkind
(Comp_Unit
) = N_Compilation_Unit
6342 and then Private_Present
(Comp_Unit
)
6346 elsif (Ekind
(S
) = E_Package
6347 or else Ekind
(S
) = E_Generic_Package
)
6348 and then (In_Private_Part
(S
)
6349 or else In_Package_Body
(S
))
6353 elsif (Ekind
(S
) = E_Procedure
6354 or else Ekind
(S
) = E_Function
)
6355 and then Has_Completion
(S
)
6366 if SS_Last
>= Scope_Stack
.First
6367 and then Scope_Stack
.Table
(SS_Last
).Entity
/= Standard_Standard
6370 Install_Use_Clauses
(Scope_Stack
.Table
(SS_Last
).First_Use_Clause
);
6372 end Restore_Scope_Stack
;
6374 ----------------------
6375 -- Save_Scope_Stack --
6376 ----------------------
6378 procedure Save_Scope_Stack
(Handle_Use
: Boolean := True) is
6381 SS_Last
: constant Int
:= Scope_Stack
.Last
;
6384 if SS_Last
>= Scope_Stack
.First
6385 and then Scope_Stack
.Table
(SS_Last
).Entity
/= Standard_Standard
6388 End_Use_Clauses
(Scope_Stack
.Table
(SS_Last
).First_Use_Clause
);
6391 -- If the call is from within a compilation unit, as when called from
6392 -- Rtsfind, make current entries in scope stack invisible while we
6393 -- analyze the new unit.
6395 for J
in reverse 0 .. SS_Last
loop
6396 exit when Scope_Stack
.Table
(J
).Entity
= Standard_Standard
6397 or else No
(Scope_Stack
.Table
(J
).Entity
);
6399 S
:= Scope_Stack
.Table
(J
).Entity
;
6400 Set_Is_Immediately_Visible
(S
, False);
6402 E
:= First_Entity
(S
);
6403 while Present
(E
) loop
6404 Set_Is_Immediately_Visible
(E
, False);
6410 end Save_Scope_Stack
;
6416 procedure Set_Use
(L
: List_Id
) is
6418 Pack_Name
: Node_Id
;
6425 while Present
(Decl
) loop
6426 if Nkind
(Decl
) = N_Use_Package_Clause
then
6427 Chain_Use_Clause
(Decl
);
6429 Pack_Name
:= First
(Names
(Decl
));
6430 while Present
(Pack_Name
) loop
6431 Pack
:= Entity
(Pack_Name
);
6433 if Ekind
(Pack
) = E_Package
6434 and then Applicable_Use
(Pack_Name
)
6436 Use_One_Package
(Pack
, Decl
);
6442 elsif Nkind
(Decl
) = N_Use_Type_Clause
then
6443 Chain_Use_Clause
(Decl
);
6445 Id
:= First
(Subtype_Marks
(Decl
));
6446 while Present
(Id
) loop
6447 if Entity
(Id
) /= Any_Type
then
6460 ---------------------
6461 -- Use_One_Package --
6462 ---------------------
6464 procedure Use_One_Package
(P
: Entity_Id
; N
: Node_Id
) is
6467 Current_Instance
: Entity_Id
:= Empty
;
6469 Private_With_OK
: Boolean := False;
6472 if Ekind
(P
) /= E_Package
then
6477 Set_Current_Use_Clause
(P
, N
);
6479 -- Ada 2005 (AI-50217): Check restriction
6481 if From_With_Type
(P
) then
6482 Error_Msg_N
("limited withed package cannot appear in use clause", N
);
6485 -- Find enclosing instance, if any
6488 Current_Instance
:= Current_Scope
;
6489 while not Is_Generic_Instance
(Current_Instance
) loop
6490 Current_Instance
:= Scope
(Current_Instance
);
6493 if No
(Hidden_By_Use_Clause
(N
)) then
6494 Set_Hidden_By_Use_Clause
(N
, New_Elmt_List
);
6498 -- If unit is a package renaming, indicate that the renamed
6499 -- package is also in use (the flags on both entities must
6500 -- remain consistent, and a subsequent use of either of them
6501 -- should be recognized as redundant).
6503 if Present
(Renamed_Object
(P
)) then
6504 Set_In_Use
(Renamed_Object
(P
));
6505 Set_Current_Use_Clause
(Renamed_Object
(P
), N
);
6506 Real_P
:= Renamed_Object
(P
);
6511 -- Ada 2005 (AI-262): Check the use_clause of a private withed package
6512 -- found in the private part of a package specification
6514 if In_Private_Part
(Current_Scope
)
6515 and then Has_Private_With
(P
)
6516 and then Is_Child_Unit
(Current_Scope
)
6517 and then Is_Child_Unit
(P
)
6518 and then Is_Ancestor_Package
(Scope
(Current_Scope
), P
)
6520 Private_With_OK
:= True;
6523 -- Loop through entities in one package making them potentially
6526 Id
:= First_Entity
(P
);
6528 and then (Id
/= First_Private_Entity
(P
)
6529 or else Private_With_OK
) -- Ada 2005 (AI-262)
6531 Prev
:= Current_Entity
(Id
);
6532 while Present
(Prev
) loop
6533 if Is_Immediately_Visible
(Prev
)
6534 and then (not Is_Overloadable
(Prev
)
6535 or else not Is_Overloadable
(Id
)
6536 or else (Type_Conformant
(Id
, Prev
)))
6538 if No
(Current_Instance
) then
6540 -- Potentially use-visible entity remains hidden
6542 goto Next_Usable_Entity
;
6544 -- A use clause within an instance hides outer global entities,
6545 -- which are not used to resolve local entities in the
6546 -- instance. Note that the predefined entities in Standard
6547 -- could not have been hidden in the generic by a use clause,
6548 -- and therefore remain visible. Other compilation units whose
6549 -- entities appear in Standard must be hidden in an instance.
6551 -- To determine whether an entity is external to the instance
6552 -- we compare the scope depth of its scope with that of the
6553 -- current instance. However, a generic actual of a subprogram
6554 -- instance is declared in the wrapper package but will not be
6555 -- hidden by a use-visible entity.
6557 -- If Id is called Standard, the predefined package with the
6558 -- same name is in the homonym chain. It has to be ignored
6559 -- because it has no defined scope (being the only entity in
6560 -- the system with this mandated behavior).
6562 elsif not Is_Hidden
(Id
)
6563 and then Present
(Scope
(Prev
))
6564 and then not Is_Wrapper_Package
(Scope
(Prev
))
6565 and then Scope_Depth
(Scope
(Prev
)) <
6566 Scope_Depth
(Current_Instance
)
6567 and then (Scope
(Prev
) /= Standard_Standard
6568 or else Sloc
(Prev
) > Standard_Location
)
6570 Set_Is_Potentially_Use_Visible
(Id
);
6571 Set_Is_Immediately_Visible
(Prev
, False);
6572 Append_Elmt
(Prev
, Hidden_By_Use_Clause
(N
));
6575 -- A user-defined operator is not use-visible if the predefined
6576 -- operator for the type is immediately visible, which is the case
6577 -- if the type of the operand is in an open scope. This does not
6578 -- apply to user-defined operators that have operands of different
6579 -- types, because the predefined mixed mode operations (multiply
6580 -- and divide) apply to universal types and do not hide anything.
6582 elsif Ekind
(Prev
) = E_Operator
6583 and then Operator_Matches_Spec
(Prev
, Id
)
6584 and then In_Open_Scopes
6585 (Scope
(Base_Type
(Etype
(First_Formal
(Id
)))))
6586 and then (No
(Next_Formal
(First_Formal
(Id
)))
6587 or else Etype
(First_Formal
(Id
))
6588 = Etype
(Next_Formal
(First_Formal
(Id
)))
6589 or else Chars
(Prev
) = Name_Op_Expon
)
6591 goto Next_Usable_Entity
;
6594 Prev
:= Homonym
(Prev
);
6597 -- On exit, we know entity is not hidden, unless it is private
6599 if not Is_Hidden
(Id
)
6600 and then ((not Is_Child_Unit
(Id
))
6601 or else Is_Visible_Child_Unit
(Id
))
6603 Set_Is_Potentially_Use_Visible
(Id
);
6605 if Is_Private_Type
(Id
)
6606 and then Present
(Full_View
(Id
))
6608 Set_Is_Potentially_Use_Visible
(Full_View
(Id
));
6612 <<Next_Usable_Entity
>>
6616 -- Child units are also made use-visible by a use clause, but they may
6617 -- appear after all visible declarations in the parent entity list.
6619 while Present
(Id
) loop
6620 if Is_Child_Unit
(Id
)
6621 and then Is_Visible_Child_Unit
(Id
)
6623 Set_Is_Potentially_Use_Visible
(Id
);
6629 if Chars
(Real_P
) = Name_System
6630 and then Scope
(Real_P
) = Standard_Standard
6631 and then Present_System_Aux
(N
)
6633 Use_One_Package
(System_Aux_Id
, N
);
6636 end Use_One_Package
;
6642 procedure Use_One_Type
(Id
: Node_Id
) is
6644 Is_Known_Used
: Boolean;
6648 function Spec_Reloaded_For_Body
return Boolean;
6649 -- Determine whether the compilation unit is a package body and the use
6650 -- type clause is in the spec of the same package. Even though the spec
6651 -- was analyzed first, its context is reloaded when analysing the body.
6653 ----------------------------
6654 -- Spec_Reloaded_For_Body --
6655 ----------------------------
6657 function Spec_Reloaded_For_Body
return Boolean is
6659 if Nkind
(Unit
(Cunit
(Current_Sem_Unit
))) = N_Package_Body
then
6661 Spec
: constant Node_Id
:=
6662 Parent
(List_Containing
(Parent
(Id
)));
6665 Nkind
(Spec
) = N_Package_Specification
6666 and then Corresponding_Body
(Parent
(Spec
)) =
6667 Cunit_Entity
(Current_Sem_Unit
);
6672 end Spec_Reloaded_For_Body
;
6674 -- Start of processing for Use_One_Type;
6677 -- It is the type determined by the subtype mark (8.4(8)) whose
6678 -- operations become potentially use-visible.
6680 T
:= Base_Type
(Entity
(Id
));
6682 -- Either the type itself is used, the package where it is declared
6683 -- is in use or the entity is declared in the current package, thus
6688 or else In_Use
(Scope
(T
))
6689 or else Scope
(T
) = Current_Scope
;
6691 Set_Redundant_Use
(Id
,
6692 Is_Known_Used
or else Is_Potentially_Use_Visible
(T
));
6694 if In_Open_Scopes
(Scope
(T
)) then
6697 elsif From_With_Type
(T
) then
6699 ("incomplete type from limited view "
6700 & "cannot appear in use clause", Id
);
6702 -- If the subtype mark designates a subtype in a different package,
6703 -- we have to check that the parent type is visible, otherwise the
6704 -- use type clause is a noop. Not clear how to do that???
6706 elsif not Redundant_Use
(Id
) then
6708 Op_List
:= Collect_Primitive_Operations
(T
);
6710 Elmt
:= First_Elmt
(Op_List
);
6711 while Present
(Elmt
) loop
6712 if (Nkind
(Node
(Elmt
)) = N_Defining_Operator_Symbol
6713 or else Chars
(Node
(Elmt
)) in Any_Operator_Name
)
6714 and then not Is_Hidden
(Node
(Elmt
))
6716 Set_Is_Potentially_Use_Visible
(Node
(Elmt
));
6723 -- If warning on redundant constructs, check for unnecessary WITH
6725 if Warn_On_Redundant_Constructs
6726 and then Is_Known_Used
6728 -- with P; with P; use P;
6729 -- package P is package X is package body X is
6730 -- type T ... use P.T;
6732 -- The compilation unit is the body of X. GNAT first compiles the
6733 -- spec of X, then procedes to the body. At that point P is marked
6734 -- as use visible. The analysis then reinstalls the spec along with
6735 -- its context. The use clause P.T is now recognized as redundant,
6736 -- but in the wrong context. Do not emit a warning in such cases.
6738 and then not Spec_Reloaded_For_Body
6740 -- The type already has a use clause
6744 ("& is already use-visible through previous use type clause?",
6747 -- The package where T is declared is already used
6749 elsif In_Use
(Scope
(T
)) then
6750 Error_Msg_Sloc
:= Sloc
(Current_Use_Clause
(Scope
(T
)));
6752 ("& is already use-visible through package use clause #?",
6755 -- The current scope is the package where T is declared
6758 Error_Msg_Node_2
:= Scope
(T
);
6760 ("& is already use-visible inside package &?", Id
, Id
);
6769 procedure Write_Info
is
6770 Id
: Entity_Id
:= First_Entity
(Current_Scope
);
6773 -- No point in dumping standard entities
6775 if Current_Scope
= Standard_Standard
then
6779 Write_Str
("========================================================");
6781 Write_Str
(" Defined Entities in ");
6782 Write_Name
(Chars
(Current_Scope
));
6784 Write_Str
("========================================================");
6788 Write_Str
("-- none --");
6792 while Present
(Id
) loop
6793 Write_Entity_Info
(Id
, " ");
6798 if Scope
(Current_Scope
) = Standard_Standard
then
6800 -- Print information on the current unit itself
6802 Write_Entity_Info
(Current_Scope
, " ");
6812 procedure Write_Scopes
is
6815 for J
in reverse 1 .. Scope_Stack
.Last
loop
6816 S
:= Scope_Stack
.Table
(J
).Entity
;
6817 Write_Int
(Int
(S
));
6818 Write_Str
(" === ");
6819 Write_Name
(Chars
(S
));