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FSF GCC merge 02/23/03
[official-gcc.git] / gcc / ada / lib-xref.adb
blob1a27736ba4cf79f8e7aff6bd425495da21404336
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- L I B . X R E F --
6 -- --
7 -- B o d y --
8 -- --
9 -- --
10 -- Copyright (C) 1998-2002, Free Software Foundation, Inc. --
11 -- --
12 -- GNAT is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNAT; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
22 -- --
23 -- GNAT was originally developed by the GNAT team at New York University. --
24 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 -- --
26 ------------------------------------------------------------------------------
27
28 with Atree; use Atree;
29 with Csets; use Csets;
30 with Errout; use Errout;
31 with Lib.Util; use Lib.Util;
32 with Namet; use Namet;
33 with Opt; use Opt;
34 with Sinfo; use Sinfo;
35 with Sinput; use Sinput;
36 with Stand; use Stand;
37 with Table; use Table;
38 with Widechar; use Widechar;
39
40 with GNAT.Heap_Sort_A;
41
42 package body Lib.Xref is
43
44 ------------------
45 -- Declarations --
46 ------------------
47
48 -- The Xref table is used to record references. The Loc field is set
49 -- to No_Location for a definition entry.
50
51 subtype Xref_Entry_Number is Int;
52
53 type Xref_Entry is record
54 Ent : Entity_Id;
55 -- Entity referenced (E parameter to Generate_Reference)
56
57 Def : Source_Ptr;
58 -- Original source location for entity being referenced. Note that
59 -- these values are used only during the output process, they are
60 -- not set when the entries are originally built. This is because
61 -- private entities can be swapped when the initial call is made.
62
63 Loc : Source_Ptr;
64 -- Location of reference (Original_Location (Sloc field of N parameter
65 -- to Generate_Reference). Set to No_Location for the case of a
66 -- defining occurrence.
67
68 Typ : Character;
69 -- Reference type (Typ param to Generate_Reference)
70
71 Eun : Unit_Number_Type;
72 -- Unit number corresponding to Ent
73
74 Lun : Unit_Number_Type;
75 -- Unit number corresponding to Loc. Value is undefined and not
76 -- referenced if Loc is set to No_Location.
77
78 end record;
79
80 package Xrefs is new Table.Table (
81 Table_Component_Type => Xref_Entry,
82 Table_Index_Type => Xref_Entry_Number,
83 Table_Low_Bound => 1,
84 Table_Initial => Alloc.Xrefs_Initial,
85 Table_Increment => Alloc.Xrefs_Increment,
86 Table_Name => "Xrefs");
87
88 -------------------------
89 -- Generate_Definition --
90 -------------------------
91
92 procedure Generate_Definition (E : Entity_Id) is
93 Loc : Source_Ptr;
94 Indx : Nat;
95
96 begin
97 pragma Assert (Nkind (E) in N_Entity);
98
99 -- Note that we do not test Xref_Entity_Letters here. It is too
100 -- early to do so, since we are often called before the entity
101 -- is fully constructed, so that the Ekind is still E_Void.
102
103 if Opt.Xref_Active
104
105 -- Definition must come from source
106
107 and then Comes_From_Source (E)
108
109 -- And must have a reasonable source location that is not
110 -- within an instance (all entities in instances are ignored)
111
112 and then Sloc (E) > No_Location
113 and then Instantiation_Location (Sloc (E)) = No_Location
114
115 -- And must be a non-internal name from the main source unit
116
117 and then In_Extended_Main_Source_Unit (E)
118 and then not Is_Internal_Name (Chars (E))
119 then
120 Xrefs.Increment_Last;
121 Indx := Xrefs.Last;
122 Loc := Original_Location (Sloc (E));
123
124 Xrefs.Table (Indx).Ent := E;
125 Xrefs.Table (Indx).Loc := No_Location;
126 Xrefs.Table (Indx).Eun := Get_Source_Unit (Loc);
127 Xrefs.Table (Indx).Lun := No_Unit;
128 end if;
129 end Generate_Definition;
130
131 ---------------------------------
132 -- Generate_Operator_Reference --
133 ---------------------------------
134
135 procedure Generate_Operator_Reference (N : Node_Id) is
136 begin
137 if not In_Extended_Main_Source_Unit (N) then
138 return;
139 end if;
140
141 -- If the operator is not a Standard operator, then we generate
142 -- a real reference to the user defined operator.
143
144 if Sloc (Entity (N)) /= Standard_Location then
145 Generate_Reference (Entity (N), N);
146
147 -- A reference to an implicit inequality operator is a also a
148 -- reference to the user-defined equality.
149
150 if Nkind (N) = N_Op_Ne
151 and then not Comes_From_Source (Entity (N))
152 and then Present (Corresponding_Equality (Entity (N)))
153 then
154 Generate_Reference (Corresponding_Equality (Entity (N)), N);
155 end if;
156
157 -- For the case of Standard operators, we mark the result type
158 -- as referenced. This ensures that in the case where we are
159 -- using a derived operator, we mark an entity of the unit that
160 -- implicitly defines this operator as used. Otherwise we may
161 -- think that no entity of the unit is used. The actual entity
162 -- marked as referenced is the first subtype, which is the user
163 -- defined entity that is relevant.
164
165 else
166 if Nkind (N) = N_Op_Eq
167 or else Nkind (N) = N_Op_Ne
168 or else Nkind (N) = N_Op_Le
169 or else Nkind (N) = N_Op_Lt
170 or else Nkind (N) = N_Op_Ge
171 or else Nkind (N) = N_Op_Gt
172 then
173 Set_Referenced (First_Subtype (Etype (Right_Opnd (N))));
174 else
175 Set_Referenced (First_Subtype (Etype (N)));
176 end if;
177 end if;
178 end Generate_Operator_Reference;
179
180 ------------------------
181 -- Generate_Reference --
182 ------------------------
183
184 procedure Generate_Reference
185 (E : Entity_Id;
186 N : Node_Id;
187 Typ : Character := 'r';
188 Set_Ref : Boolean := True;
189 Force : Boolean := False)
190 is
191 Indx : Nat;
192 Nod : Node_Id;
193 Ref : Source_Ptr;
194 Def : Source_Ptr;
195 Ent : Entity_Id;
196
197 begin
198 pragma Assert (Nkind (E) in N_Entity);
199
200 -- Never collect references if not in main source unit. However,
201 -- we omit this test if Typ is 'e', since these entries are
202 -- really structural, and it is useful to have them in units
203 -- that reference packages as well as units that define packages.
204 -- We also omit the test for the case of 'p' since we want to
205 -- include inherited primitive operations from other packages.
206
207 if not In_Extended_Main_Source_Unit (N)
208 and then Typ /= 'e'
209 and then Typ /= 'p'
210 then
211 return;
212 end if;
213
214 -- For reference type p, then entity must be in main source unit
215
216 if Typ = 'p' and then not In_Extended_Main_Source_Unit (E) then
217 return;
218 end if;
219
220 -- Unless the reference is forced, we ignore references where
221 -- the reference itself does not come from Source.
222
223 if not Force and then not Comes_From_Source (N) then
224 return;
225 end if;
226
227 -- Deal with setting entity as referenced, unless suppressed.
228 -- Note that we still do Set_Referenced on entities that do not
229 -- come from source. This situation arises when we have a source
230 -- reference to a derived operation, where the derived operation
231 -- itself does not come from source, but we still want to mark it
232 -- as referenced, since we really are referencing an entity in the
233 -- corresponding package (this avoids incorrect complaints that the
234 -- package contains no referenced entities).
235
236 if Set_Ref then
237 Set_Referenced (E);
238
239 -- Check for pragma unreferenced given
240
241 if Has_Pragma_Unreferenced (E) then
242
243 -- A reference as a named parameter in a call does not count
244 -- as a violation of pragma Unreferenced for this purpose.
245
246 if Nkind (N) = N_Identifier
247 and then Nkind (Parent (N)) = N_Parameter_Association
248 and then Selector_Name (Parent (N)) = N
249 then
250 null;
251
252 -- Here we issue the warning, since this is a real reference
253
254 else
255 Error_Msg_NE ("?pragma Unreferenced given for&", N, E);
256 end if;
257 end if;
258
259 -- If this is a subprogram instance, mark as well the internal
260 -- subprogram in the wrapper package, which may be a visible
261 -- compilation unit.
262
263 if Is_Overloadable (E)
264 and then Is_Generic_Instance (E)
265 and then Present (Alias (E))
266 then
267 Set_Referenced (Alias (E));
268 end if;
269 end if;
270
271 -- Generate reference if all conditions are met:
272
273 if
274 -- Cross referencing must be active
275
276 Opt.Xref_Active
277
278 -- The entity must be one for which we collect references
279
280 and then Xref_Entity_Letters (Ekind (E)) /= ' '
281
282 -- Both Sloc values must be set to something sensible
283
284 and then Sloc (E) > No_Location
285 and then Sloc (N) > No_Location
286
287 -- We ignore references from within an instance
288
289 and then Instantiation_Location (Sloc (N)) = No_Location
290
291 -- Ignore dummy references
292
293 and then Typ /= ' '
294 then
295 if Nkind (N) = N_Identifier
296 or else
297 Nkind (N) = N_Defining_Identifier
298 or else
299 Nkind (N) in N_Op
300 or else
301 Nkind (N) = N_Defining_Operator_Symbol
302 or else
303 (Nkind (N) = N_Character_Literal
304 and then Sloc (Entity (N)) /= Standard_Location)
305 or else
306 Nkind (N) = N_Defining_Character_Literal
307 then
308 Nod := N;
309
310 elsif Nkind (N) = N_Expanded_Name
311 or else
312 Nkind (N) = N_Selected_Component
313 then
314 Nod := Selector_Name (N);
315
316 else
317 return;
318 end if;
319
320 -- Normal case of source entity comes from source
321
322 if Comes_From_Source (E) then
323 Ent := E;
324
325 -- Entity does not come from source, but is a derived subprogram
326 -- and the derived subprogram comes from source, in which case
327 -- the reference is to this parent subprogram.
328
329 elsif Is_Overloadable (E)
330 and then Present (Alias (E))
331 and then Comes_From_Source (Alias (E))
332 then
333 Ent := Alias (E);
334
335 -- Ignore reference to any other source that is not from source
336
337 else
338 return;
339 end if;
340
341 -- Record reference to entity
342
343 Ref := Original_Location (Sloc (Nod));
344 Def := Original_Location (Sloc (Ent));
345
346 Xrefs.Increment_Last;
347 Indx := Xrefs.Last;
348
349 Xrefs.Table (Indx).Loc := Ref;
350 Xrefs.Table (Indx).Typ := Typ;
351 Xrefs.Table (Indx).Eun := Get_Source_Unit (Def);
352 Xrefs.Table (Indx).Lun := Get_Source_Unit (Ref);
353 Xrefs.Table (Indx).Ent := Ent;
354 end if;
355 end Generate_Reference;
356
357 -----------------------
358 -- Output_References --
359 -----------------------
360
361 procedure Output_References is
362 Nrefs : constant Nat := Xrefs.Last;
363
364 Rnums : array (0 .. Nrefs) of Nat;
365 -- This array contains numbers of references in the Xrefs table. This
366 -- list is sorted in output order. The extra 0'th entry is convenient
367 -- for the call to sort. When we sort the table, we move these entries
368 -- around, but we do not move the original table entries.
369
370 function Lt (Op1, Op2 : Natural) return Boolean;
371 -- Comparison function for Sort call
372
373 procedure Move (From : Natural; To : Natural);
374 -- Move procedure for Sort call
375
376 function Lt (Op1, Op2 : Natural) return Boolean is
377 T1 : Xref_Entry renames Xrefs.Table (Rnums (Nat (Op1)));
378 T2 : Xref_Entry renames Xrefs.Table (Rnums (Nat (Op2)));
379
380 begin
381 -- First test. If entity is in different unit, sort by unit
382
383 if T1.Eun /= T2.Eun then
384 return Dependency_Num (T1.Eun) < Dependency_Num (T2.Eun);
385
386 -- Second test, within same unit, sort by entity Sloc
387
388 elsif T1.Def /= T2.Def then
389 return T1.Def < T2.Def;
390
391 -- Third test, sort definitions ahead of references
392
393 elsif T1.Loc = No_Location then
394 return True;
395
396 elsif T2.Loc = No_Location then
397 return False;
398
399 -- Fourth test, for same entity, sort by reference location unit
400
401 elsif T1.Lun /= T2.Lun then
402 return Dependency_Num (T1.Lun) < Dependency_Num (T2.Lun);
403
404 -- Fifth test order of location within referencing unit
405
406 elsif T1.Loc /= T2.Loc then
407 return T1.Loc < T2.Loc;
408
409 -- Finally, for two locations at the same address, we prefer
410 -- the one that does NOT have the type 'r' so that a modification
411 -- or extension takes preference, when there are more than one
412 -- reference at the same location.
413
414 else
415 return T2.Typ = 'r';
416 end if;
417 end Lt;
418
419 procedure Move (From : Natural; To : Natural) is
420 begin
421 Rnums (Nat (To)) := Rnums (Nat (From));
422 end Move;
423
424 -- Start of processing for Output_References
425
426 begin
427 if not Opt.Xref_Active then
428 return;
429 end if;
430
431 -- Capture the definition Sloc values. We delay doing this till now,
432 -- since at the time the reference or definition is made, private
433 -- types may be swapped, and the Sloc value may be incorrect. We
434 -- also set up the pointer vector for the sort.
435
436 for J in 1 .. Nrefs loop
437 Rnums (J) := J;
438 Xrefs.Table (J).Def :=
439 Original_Location (Sloc (Xrefs.Table (J).Ent));
440 end loop;
441
442 -- Sort the references
443
444 GNAT.Heap_Sort_A.Sort
445 (Integer (Nrefs),
446 Move'Unrestricted_Access,
447 Lt'Unrestricted_Access);
448
449 -- Now output the references
450
451 Output_Refs : declare
452
453 Curxu : Unit_Number_Type;
454 -- Current xref unit
455
456 Curru : Unit_Number_Type;
457 -- Current reference unit for one entity
458
459 Cursrc : Source_Buffer_Ptr;
460 -- Current xref unit source text
461
462 Curent : Entity_Id;
463 -- Current entity
464
465 Curnam : String (1 .. Name_Buffer'Length);
466 Curlen : Natural;
467 -- Simple name and length of current entity
468
469 Curdef : Source_Ptr;
470 -- Original source location for current entity
471
472 Crloc : Source_Ptr;
473 -- Current reference location
474
475 Ctyp : Character;
476 -- Entity type character
477
478 Tref : Entity_Id;
479 -- Type reference
480
481 Rref : Node_Id;
482 -- Renaming reference
483
484 Trunit : Unit_Number_Type;
485 -- Unit number for type reference
486
487 function Name_Change (X : Entity_Id) return Boolean;
488 -- Determines if entity X has a different simple name from Curent
489
490 -----------------
491 -- Name_Change --
492 -----------------
493
494 function Name_Change (X : Entity_Id) return Boolean is
495 begin
496 Get_Unqualified_Name_String (Chars (X));
497
498 if Name_Len /= Curlen then
499 return True;
500
501 else
502 return Name_Buffer (1 .. Curlen) /= Curnam (1 .. Curlen);
503 end if;
504 end Name_Change;
505
506 -- Start of processing for Output_Refs
507
508 begin
509 Curxu := No_Unit;
510 Curent := Empty;
511 Curdef := No_Location;
512 Curru := No_Unit;
513 Crloc := No_Location;
514
515 for Refno in 1 .. Nrefs loop
516
517 Output_One_Ref : declare
518
519 XE : Xref_Entry renames Xrefs.Table (Rnums (Refno));
520 -- The current entry to be accessed
521
522 P : Source_Ptr;
523 -- Used to index into source buffer to get entity name
524
525 P2 : Source_Ptr;
526 WC : Char_Code;
527 Err : Boolean;
528 Ent : Entity_Id;
529 Sav : Entity_Id;
530
531 Left : Character;
532 Right : Character;
533 -- Used for {} or <> for type reference
534
535 procedure Output_Instantiation_Refs (Loc : Source_Ptr);
536 -- Recursive procedure to output instantiation references for
537 -- the given source ptr in [file|line[...]] form. No output
538 -- if the given location is not a generic template reference.
539
540 -------------------------------
541 -- Output_Instantiation_Refs --
542 -------------------------------
543
544 procedure Output_Instantiation_Refs (Loc : Source_Ptr) is
545 Iloc : constant Source_Ptr := Instantiation_Location (Loc);
546 Lun : Unit_Number_Type;
547
548 begin
549 -- Nothing to do if this is not an instantiation
550
551 if Iloc = No_Location then
552 return;
553 end if;
554
555 -- Output instantiation reference
556
557 Write_Info_Char ('[');
558 Lun := Get_Source_Unit (Iloc);
559
560 if Lun /= Curru then
561 Curru := XE.Lun;
562 Write_Info_Nat (Dependency_Num (Curru));
563 Write_Info_Char ('|');
564 end if;
565
566 Write_Info_Nat (Int (Get_Logical_Line_Number (Iloc)));
567
568 -- Recursive call to get nested instantiations
569
570 Output_Instantiation_Refs (Iloc);
571
572 -- Output final ] after call to get proper nesting
573
574 Write_Info_Char (']');
575 return;
576 end Output_Instantiation_Refs;
577
578 -- Start of processing for Output_One_Ref
579
580 begin
581 Ent := XE.Ent;
582 Ctyp := Xref_Entity_Letters (Ekind (Ent));
583
584 -- Skip reference if it is the only reference to an entity,
585 -- and it is an end-line reference, and the entity is not in
586 -- the current extended source. This prevents junk entries
587 -- consisting only of packages with end lines, where no
588 -- entity from the package is actually referenced.
589
590 if XE.Typ = 'e'
591 and then Ent /= Curent
592 and then (Refno = Nrefs or else
593 Ent /= Xrefs.Table (Rnums (Refno + 1)).Ent)
594 and then
595 not In_Extended_Main_Source_Unit (Ent)
596 then
597 goto Continue;
598 end if;
599
600 -- For private type, get full view type
601
602 if Ctyp = '+'
603 and then Present (Full_View (XE.Ent))
604 then
605 Ent := Underlying_Type (Ent);
606
607 if Present (Ent) then
608 Ctyp := Xref_Entity_Letters (Ekind (Ent));
609 end if;
610 end if;
611
612 -- Special exception for Boolean
613
614 if Ctyp = 'E' and then Is_Boolean_Type (Ent) then
615 Ctyp := 'B';
616 end if;
617
618 -- For variable reference, get corresponding type
619
620 if Ctyp = '*' then
621 Ent := Etype (XE.Ent);
622 Ctyp := Fold_Lower (Xref_Entity_Letters (Ekind (Ent)));
623
624 -- If variable is private type, get full view type
625
626 if Ctyp = '+'
627 and then Present (Full_View (Etype (XE.Ent)))
628 then
629 Ent := Underlying_Type (Etype (XE.Ent));
630
631 if Present (Ent) then
632 Ctyp := Xref_Entity_Letters (Ekind (Ent));
633 end if;
634 end if;
635
636 -- Special handling for access parameter
637
638 if Ekind (Etype (XE.Ent)) = E_Anonymous_Access_Type
639 and then Is_Formal (XE.Ent)
640 then
641 Ctyp := 'p';
642
643 -- Special handling for Boolean
644
645 elsif Ctyp = 'e' and then Is_Boolean_Type (Ent) then
646 Ctyp := 'b';
647 end if;
648 end if;
649
650 -- Only output reference if interesting type of entity,
651 -- and suppress self references. Also suppress definitions
652 -- of body formals (we only treat these as references, and
653 -- the references were separately recorded).
654
655 if Ctyp /= ' '
656 and then XE.Loc /= XE.Def
657 and then (not Is_Formal (XE.Ent)
658 or else No (Spec_Entity (XE.Ent)))
659 then
660 -- Start new Xref section if new xref unit
661
662 if XE.Eun /= Curxu then
663
664 if Write_Info_Col > 1 then
665 Write_Info_EOL;
666 end if;
667
668 Curxu := XE.Eun;
669 Cursrc := Source_Text (Source_Index (Curxu));
670
671 Write_Info_Initiate ('X');
672 Write_Info_Char (' ');
673 Write_Info_Nat (Dependency_Num (XE.Eun));
674 Write_Info_Char (' ');
675 Write_Info_Name (Reference_Name (Source_Index (XE.Eun)));
676 end if;
677
678 -- Start new Entity line if new entity. Note that we
679 -- consider two entities the same if they have the same
680 -- name and source location. This causes entities in
681 -- instantiations to be treated as though they referred
682 -- to the template.
683
684 if No (Curent)
685 or else
686 (XE.Ent /= Curent
687 and then
688 (Name_Change (XE.Ent) or else XE.Def /= Curdef))
689 then
690 Curent := XE.Ent;
691 Curdef := XE.Def;
692
693 Get_Unqualified_Name_String (Chars (XE.Ent));
694 Curlen := Name_Len;
695 Curnam (1 .. Curlen) := Name_Buffer (1 .. Curlen);
696
697 if Write_Info_Col > 1 then
698 Write_Info_EOL;
699 end if;
700
701 -- Write column number information
702
703 Write_Info_Nat (Int (Get_Logical_Line_Number (XE.Def)));
704 Write_Info_Char (Ctyp);
705 Write_Info_Nat (Int (Get_Column_Number (XE.Def)));
706
707 -- Write level information
708
709 if Is_Public (Curent) and then not Is_Hidden (Curent) then
710 Write_Info_Char ('*');
711 else
712 Write_Info_Char (' ');
713 end if;
714
715 -- Output entity name. We use the occurrence from the
716 -- actual source program at the definition point
717
718 P := Original_Location (Sloc (XE.Ent));
719
720 -- Entity is character literal
721
722 if Cursrc (P) = ''' then
723 Write_Info_Char (Cursrc (P));
724 Write_Info_Char (Cursrc (P + 1));
725 Write_Info_Char (Cursrc (P + 2));
726
727 -- Entity is operator symbol
728
729 elsif Cursrc (P) = '"' or else Cursrc (P) = '%' then
730 Write_Info_Char (Cursrc (P));
731
732 P2 := P;
733 loop
734 P2 := P2 + 1;
735 Write_Info_Char (Cursrc (P2));
736 exit when Cursrc (P2) = Cursrc (P);
737 end loop;
738
739 -- Entity is identifier
740
741 else
742 loop
743 if Is_Start_Of_Wide_Char (Cursrc, P) then
744 Scan_Wide (Cursrc, P, WC, Err);
745 elsif not Identifier_Char (Cursrc (P)) then
746 exit;
747 else
748 P := P + 1;
749 end if;
750 end loop;
751
752 for J in
753 Original_Location (Sloc (XE.Ent)) .. P - 1
754 loop
755 Write_Info_Char (Cursrc (J));
756 end loop;
757 end if;
758
759 -- See if we have a renaming reference
760
761 if Is_Object (XE.Ent)
762 and then Present (Renamed_Object (XE.Ent))
763 then
764 Rref := Renamed_Object (XE.Ent);
765
766 elsif Is_Overloadable (XE.Ent)
767 and then Nkind (Parent (Declaration_Node (XE.Ent))) =
768 N_Subprogram_Renaming_Declaration
769 then
770 Rref := Name (Parent (Declaration_Node (XE.Ent)));
771
772 elsif Ekind (XE.Ent) = E_Package
773 and then Nkind (Declaration_Node (XE.Ent)) =
774 N_Package_Renaming_Declaration
775 then
776 Rref := Name (Declaration_Node (XE.Ent));
777
778 else
779 Rref := Empty;
780 end if;
781
782 if Present (Rref) then
783 if Nkind (Rref) = N_Expanded_Name then
784 Rref := Selector_Name (Rref);
785 end if;
786
787 if Nkind (Rref) /= N_Identifier then
788 Rref := Empty;
789 end if;
790 end if;
791
792 -- Write out renaming reference if we have one
793
794 if Present (Rref) then
795 Write_Info_Char ('=');
796 Write_Info_Nat
797 (Int (Get_Logical_Line_Number (Sloc (Rref))));
798 Write_Info_Char (':');
799 Write_Info_Nat
800 (Int (Get_Column_Number (Sloc (Rref))));
801 end if;
802
803 -- See if we have a type reference
804
805 Tref := XE.Ent;
806 Left := '{';
807 Right := '}';
808
809 loop
810 Sav := Tref;
811
812 -- Processing for types
813
814 if Is_Type (Tref) then
815
816 -- Case of base type
817
818 if Base_Type (Tref) = Tref then
819
820 -- If derived, then get first subtype
821
822 if Tref /= Etype (Tref) then
823 Tref := First_Subtype (Etype (Tref));
824
825 -- Set brackets for derived type, but don't
826 -- override pointer case since the fact that
827 -- something is a pointer is more important
828
829 if Left /= '(' then
830 Left := '<';
831 Right := '>';
832 end if;
833
834 -- If non-derived ptr, get designated type
835
836 elsif Is_Access_Type (Tref) then
837 Tref := Designated_Type (Tref);
838 Left := '(';
839 Right := ')';
840
841 -- For other non-derived base types, nothing
842
843 else
844 exit;
845 end if;
846
847 -- For a subtype, go to ancestor subtype
848
849 else
850 Tref := Ancestor_Subtype (Tref);
851
852 -- If no ancestor subtype, go to base type
853
854 if No (Tref) then
855 Tref := Base_Type (Sav);
856 end if;
857 end if;
858
859 -- For objects, functions, enum literals,
860 -- just get type from Etype field.
861
862 elsif Is_Object (Tref)
863 or else Ekind (Tref) = E_Enumeration_Literal
864 or else Ekind (Tref) = E_Function
865 or else Ekind (Tref) = E_Operator
866 then
867 Tref := Etype (Tref);
868
869 -- For anything else, exit
870
871 else
872 exit;
873 end if;
874
875 -- Exit if no type reference, or we are stuck in
876 -- some loop trying to find the type reference, or
877 -- if the type is standard void type (the latter is
878 -- an implementation artifact that should not show
879 -- up in the generated cross-references).
880
881 exit when No (Tref)
882 or else Tref = Sav
883 or else Tref = Standard_Void_Type;
884
885 -- Here we have a type reference to output
886
887 -- Case of standard entity, output name
888
889 if Sloc (Tref) = Standard_Location then
890 Write_Info_Char (Left);
891 Write_Info_Name (Chars (Tref));
892 Write_Info_Char (Right);
893 exit;
894
895 -- Case of source entity, output location
896
897 elsif Comes_From_Source (Tref) then
898
899 -- Do not output type reference if referenced
900 -- entity is not in the main unit and is itself
901 -- not referenced, since otherwise the reference
902 -- will dangle.
903
904 exit when not Referenced (Tref)
905 and then not In_Extended_Main_Source_Unit (Tref);
906
907 -- Output the reference
908
909 Write_Info_Char (Left);
910 Trunit := Get_Source_Unit (Sloc (Tref));
911
912 if Trunit /= Curxu then
913 Write_Info_Nat (Dependency_Num (Trunit));
914 Write_Info_Char ('|');
915 end if;
916
917 Write_Info_Nat
918 (Int (Get_Logical_Line_Number (Sloc (Tref))));
919
920 declare
921 Ent : Entity_Id := Tref;
922 Kind : constant Entity_Kind := Ekind (Ent);
923 Ctyp : Character := Xref_Entity_Letters (Kind);
924
925 begin
926 if Ctyp = '+'
927 and then Present (Full_View (Ent))
928 then
929 Ent := Underlying_Type (Ent);
930
931 if Present (Ent) then
932 Ctyp := Xref_Entity_Letters (Ekind (Ent));
933 end if;
934 end if;
935
936 Write_Info_Char (Ctyp);
937 end;
938
939 Write_Info_Nat
940 (Int (Get_Column_Number (Sloc (Tref))));
941 Write_Info_Char (Right);
942 exit;
943
944 -- If non-standard, non-source entity, keep looking
945
946 else
947 null;
948 end if;
949 end loop;
950
951 -- End of processing for entity output
952
953 Curru := Curxu;
954 Crloc := No_Location;
955 end if;
956
957 -- Output the reference
958
959 if XE.Loc /= No_Location
960 and then XE.Loc /= Crloc
961 then
962 Crloc := XE.Loc;
963
964 -- Start continuation if line full, else blank
965
966 if Write_Info_Col > 72 then
967 Write_Info_EOL;
968 Write_Info_Initiate ('.');
969 end if;
970
971 Write_Info_Char (' ');
972
973 -- Output file number if changed
974
975 if XE.Lun /= Curru then
976 Curru := XE.Lun;
977 Write_Info_Nat (Dependency_Num (Curru));
978 Write_Info_Char ('|');
979 end if;
980
981 Write_Info_Nat (Int (Get_Logical_Line_Number (XE.Loc)));
982 Write_Info_Char (XE.Typ);
983 Write_Info_Nat (Int (Get_Column_Number (XE.Loc)));
984
985 Output_Instantiation_Refs (Sloc (XE.Ent));
986 end if;
987 end if;
988 end Output_One_Ref;
989
990 <<Continue>>
991 null;
992 end loop;
993
994 Write_Info_EOL;
995 end Output_Refs;
996 end Output_References;
997
998 end Lib.Xref;
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