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Merge from mainline
[official-gcc.git] / gcc / ada / lib-xref.adb
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1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- L I B . X R E F --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1998-2006, Free Software Foundation, Inc. --
10 -- --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
21 -- --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 -- --
25 ------------------------------------------------------------------------------
26
27 with Atree; use Atree;
28 with Csets; use Csets;
29 with Elists; use Elists;
30 with Errout; use Errout;
31 with Lib.Util; use Lib.Util;
32 with Namet; use Namet;
33 with Nlists; use Nlists;
34 with Opt; use Opt;
35 with Restrict; use Restrict;
36 with Rident; use Rident;
37 with Sem; use Sem;
38 with Sem_Prag; use Sem_Prag;
39 with Sem_Util; use Sem_Util;
40 with Sinfo; use Sinfo;
41 with Sinput; use Sinput;
42 with Snames; use Snames;
43 with Stringt; use Stringt;
44 with Stand; use Stand;
45 with Table; use Table;
46 with Widechar; use Widechar;
47
48 with GNAT.Heap_Sort_A;
49
50 package body Lib.Xref is
51
52 ------------------
53 -- Declarations --
54 ------------------
55
56 -- The Xref table is used to record references. The Loc field is set
57 -- to No_Location for a definition entry.
58
59 subtype Xref_Entry_Number is Int;
60
61 type Xref_Entry is record
62 Ent : Entity_Id;
63 -- Entity referenced (E parameter to Generate_Reference)
64
65 Def : Source_Ptr;
66 -- Original source location for entity being referenced. Note that
67 -- these values are used only during the output process, they are
68 -- not set when the entries are originally built. This is because
69 -- private entities can be swapped when the initial call is made.
70
71 Loc : Source_Ptr;
72 -- Location of reference (Original_Location (Sloc field of N parameter
73 -- to Generate_Reference). Set to No_Location for the case of a
74 -- defining occurrence.
75
76 Typ : Character;
77 -- Reference type (Typ param to Generate_Reference)
78
79 Eun : Unit_Number_Type;
80 -- Unit number corresponding to Ent
81
82 Lun : Unit_Number_Type;
83 -- Unit number corresponding to Loc. Value is undefined and not
84 -- referenced if Loc is set to No_Location.
85
86 end record;
87
88 package Xrefs is new Table.Table (
89 Table_Component_Type => Xref_Entry,
90 Table_Index_Type => Xref_Entry_Number,
91 Table_Low_Bound => 1,
92 Table_Initial => Alloc.Xrefs_Initial,
93 Table_Increment => Alloc.Xrefs_Increment,
94 Table_Name => "Xrefs");
95
96 -------------------------
97 -- Generate_Definition --
98 -------------------------
99
100 procedure Generate_Definition (E : Entity_Id) is
101 Loc : Source_Ptr;
102 Indx : Nat;
103
104 begin
105 pragma Assert (Nkind (E) in N_Entity);
106
107 -- Note that we do not test Xref_Entity_Letters here. It is too
108 -- early to do so, since we are often called before the entity
109 -- is fully constructed, so that the Ekind is still E_Void.
110
111 if Opt.Xref_Active
112
113 -- Definition must come from source
114 -- We make an exception for subprogram child units that have no
115 -- spec. For these we generate a subprogram declaration for library
116 -- use, and the corresponding entity does not come from source.
117 -- Nevertheless, all references will be attached to it and we have
118 -- to treat is as coming from user code.
119
120 and then (Comes_From_Source (E) or else Is_Child_Unit (E))
121
122 -- And must have a reasonable source location that is not
123 -- within an instance (all entities in instances are ignored)
124
125 and then Sloc (E) > No_Location
126 and then Instantiation_Location (Sloc (E)) = No_Location
127
128 -- And must be a non-internal name from the main source unit
129
130 and then In_Extended_Main_Source_Unit (E)
131 and then not Is_Internal_Name (Chars (E))
132 then
133 Xrefs.Increment_Last;
134 Indx := Xrefs.Last;
135 Loc := Original_Location (Sloc (E));
136
137 Xrefs.Table (Indx).Ent := E;
138 Xrefs.Table (Indx).Loc := No_Location;
139 Xrefs.Table (Indx).Eun := Get_Source_Unit (Loc);
140 Xrefs.Table (Indx).Lun := No_Unit;
141 Set_Has_Xref_Entry (E);
142
143 if In_Inlined_Body then
144 Set_Referenced (E);
145 end if;
146 end if;
147 end Generate_Definition;
148
149 ---------------------------------
150 -- Generate_Operator_Reference --
151 ---------------------------------
152
153 procedure Generate_Operator_Reference
154 (N : Node_Id;
155 T : Entity_Id)
156 is
157 begin
158 if not In_Extended_Main_Source_Unit (N) then
159 return;
160 end if;
161
162 -- If the operator is not a Standard operator, then we generate
163 -- a real reference to the user defined operator.
164
165 if Sloc (Entity (N)) /= Standard_Location then
166 Generate_Reference (Entity (N), N);
167
168 -- A reference to an implicit inequality operator is a also a
169 -- reference to the user-defined equality.
170
171 if Nkind (N) = N_Op_Ne
172 and then not Comes_From_Source (Entity (N))
173 and then Present (Corresponding_Equality (Entity (N)))
174 then
175 Generate_Reference (Corresponding_Equality (Entity (N)), N);
176 end if;
177
178 -- For the case of Standard operators, we mark the result type
179 -- as referenced. This ensures that in the case where we are
180 -- using a derived operator, we mark an entity of the unit that
181 -- implicitly defines this operator as used. Otherwise we may
182 -- think that no entity of the unit is used. The actual entity
183 -- marked as referenced is the first subtype, which is the user
184 -- defined entity that is relevant.
185
186 -- Note: we only do this for operators that come from source.
187 -- The generated code sometimes reaches for entities that do
188 -- not need to be explicitly visible (for example, when we
189 -- expand the code for comparing two record types, the fields
190 -- of the record may not be visible).
191
192 elsif Comes_From_Source (N) then
193 Set_Referenced (First_Subtype (T));
194 end if;
195 end Generate_Operator_Reference;
196
197 ------------------------
198 -- Generate_Reference --
199 ------------------------
200
201 procedure Generate_Reference
202 (E : Entity_Id;
203 N : Node_Id;
204 Typ : Character := 'r';
205 Set_Ref : Boolean := True;
206 Force : Boolean := False)
207 is
208 Indx : Nat;
209 Nod : Node_Id;
210 Ref : Source_Ptr;
211 Def : Source_Ptr;
212 Ent : Entity_Id;
213
214 function Is_On_LHS (Node : Node_Id) return Boolean;
215 -- Used to check if a node is on the left hand side of an
216 -- assignment. The following cases are handled:
217 --
218 -- Variable Node is a direct descendant of an assignment
219 -- statement.
220 --
221 -- Prefix Of an indexed or selected component that is
222 -- present in a subtree rooted by an assignment
223 -- statement. There is no restriction of nesting
224 -- of components, thus cases such as A.B(C).D are
225 -- handled properly.
226
227 ---------------
228 -- Is_On_LHS --
229 ---------------
230
231 -- Couldn't we use Is_Lvalue or whatever it is called ???
232
233 function Is_On_LHS (Node : Node_Id) return Boolean is
234 N : Node_Id := Node;
235
236 begin
237 -- Only identifiers are considered, is this necessary???
238
239 if Nkind (N) /= N_Identifier then
240 return False;
241 end if;
242
243 -- Reach the assignment statement subtree root. In the
244 -- case of a variable being a direct descendant of an
245 -- assignment statement, the loop is skiped.
246
247 while Nkind (Parent (N)) /= N_Assignment_Statement loop
248
249 -- Check whether the parent is a component and the
250 -- current node is its prefix.
251
252 if (Nkind (Parent (N)) = N_Selected_Component
253 or else
254 Nkind (Parent (N)) = N_Indexed_Component)
255 and then Prefix (Parent (N)) = N
256 then
257 N := Parent (N);
258 else
259 return False;
260 end if;
261 end loop;
262
263 -- Parent (N) is assignment statement, check whether N is its name
264
265 return Name (Parent (N)) = N;
266 end Is_On_LHS;
267
268 -- Start of processing for Generate_Reference
269
270 begin
271 pragma Assert (Nkind (E) in N_Entity);
272
273 -- Check for obsolescent reference to ASCII
274
275 if E = Standard_ASCII then
276 Check_Restriction (No_Obsolescent_Features, N);
277 end if;
278
279 -- Warn if reference to Ada 2005 entity not in Ada 2005 mode. We only
280 -- detect real explicit references (modifications and references).
281
282 if Is_Ada_2005 (E)
283 and then Ada_Version < Ada_05
284 and then Warn_On_Ada_2005_Compatibility
285 and then (Typ = 'm' or else Typ = 'r')
286 then
287 Error_Msg_NE ("& is only defined in Ada 2005?", N, E);
288 end if;
289
290 -- Never collect references if not in main source unit. However, we omit
291 -- this test if Typ is 'e' or 'k', since these entries are structural,
292 -- and it is useful to have them in units that reference packages as
293 -- well as units that define packages. We also omit the test for the
294 -- case of 'p' since we want to include inherited primitive operations
295 -- from other packages.
296
297 if not In_Extended_Main_Source_Unit (N)
298 and then Typ /= 'e'
299 and then Typ /= 'p'
300 and then Typ /= 'k'
301 then
302 return;
303 end if;
304
305 -- For reference type p, the entity must be in main source unit
306
307 if Typ = 'p' and then not In_Extended_Main_Source_Unit (E) then
308 return;
309 end if;
310
311 -- Unless the reference is forced, we ignore references where
312 -- the reference itself does not come from Source.
313
314 if not Force and then not Comes_From_Source (N) then
315 return;
316 end if;
317
318 -- Deal with setting entity as referenced, unless suppressed.
319 -- Note that we still do Set_Referenced on entities that do not
320 -- come from source. This situation arises when we have a source
321 -- reference to a derived operation, where the derived operation
322 -- itself does not come from source, but we still want to mark it
323 -- as referenced, since we really are referencing an entity in the
324 -- corresponding package (this avoids incorrect complaints that the
325 -- package contains no referenced entities).
326
327 if Set_Ref then
328
329 -- For a variable that appears on the left side of an
330 -- assignment statement, we set the Referenced_As_LHS
331 -- flag since this is indeed a left hand side.
332 -- We also set the Referenced_As_LHS flag of a prefix
333 -- of selected or indexed component.
334
335 if Ekind (E) = E_Variable
336 and then Is_On_LHS (N)
337 then
338 Set_Referenced_As_LHS (E);
339
340 -- Check for a reference in a pragma that should not count as a
341 -- making the variable referenced for warning purposes.
342
343 elsif Is_Non_Significant_Pragma_Reference (N) then
344 null;
345
346 -- A reference in an attribute definition clause does not
347 -- count as a reference except for the case of Address.
348 -- The reason that 'Address is an exception is that it
349 -- creates an alias through which the variable may be
350 -- referenced.
351
352 elsif Nkind (Parent (N)) = N_Attribute_Definition_Clause
353 and then Chars (Parent (N)) /= Name_Address
354 and then N = Name (Parent (N))
355 then
356 null;
357
358 -- Constant completion does not count as a reference
359
360 elsif Typ = 'c'
361 and then Ekind (E) = E_Constant
362 then
363 null;
364
365 -- Record representation clause does not count as a reference
366
367 elsif Nkind (N) = N_Identifier
368 and then Nkind (Parent (N)) = N_Record_Representation_Clause
369 then
370 null;
371
372 -- Discriminants do not need to produce a reference to record type
373
374 elsif Typ = 'd'
375 and then Nkind (Parent (N)) = N_Discriminant_Specification
376 then
377 null;
378
379 -- Any other occurrence counts as referencing the entity
380
381 else
382 Set_Referenced (E);
383 end if;
384
385 -- Check for pragma Unreferenced given and reference is within
386 -- this source unit (occasion for possible warning to be issued)
387
388 if Has_Pragma_Unreferenced (E)
389 and then In_Same_Extended_Unit (E, N)
390 then
391 -- A reference as a named parameter in a call does not count
392 -- as a violation of pragma Unreferenced for this purpose.
393
394 if Nkind (N) = N_Identifier
395 and then Nkind (Parent (N)) = N_Parameter_Association
396 and then Selector_Name (Parent (N)) = N
397 then
398 null;
399
400 -- Neither does a reference to a variable on the left side
401 -- of an assignment.
402
403 elsif Is_On_LHS (N) then
404 null;
405
406 -- For entry formals, we want to place the warning on the
407 -- corresponding entity in the accept statement. The current
408 -- scope is the body of the accept, so we find the formal
409 -- whose name matches that of the entry formal (there is no
410 -- link between the two entities, and the one in the accept
411 -- statement is only used for conformance checking).
412
413 elsif Ekind (Scope (E)) = E_Entry then
414 declare
415 BE : Entity_Id;
416
417 begin
418 BE := First_Entity (Current_Scope);
419 while Present (BE) loop
420 if Chars (BE) = Chars (E) then
421 Error_Msg_NE
422 ("?pragma Unreferenced given for&", N, BE);
423 exit;
424 end if;
425
426 Next_Entity (BE);
427 end loop;
428 end;
429
430 -- Here we issue the warning, since this is a real reference
431
432 else
433 Error_Msg_NE ("?pragma Unreferenced given for&", N, E);
434 end if;
435 end if;
436
437 -- If this is a subprogram instance, mark as well the internal
438 -- subprogram in the wrapper package, which may be a visible
439 -- compilation unit.
440
441 if Is_Overloadable (E)
442 and then Is_Generic_Instance (E)
443 and then Present (Alias (E))
444 then
445 Set_Referenced (Alias (E));
446 end if;
447 end if;
448
449 -- Generate reference if all conditions are met:
450
451 if
452 -- Cross referencing must be active
453
454 Opt.Xref_Active
455
456 -- The entity must be one for which we collect references
457
458 and then Xref_Entity_Letters (Ekind (E)) /= ' '
459
460 -- Both Sloc values must be set to something sensible
461
462 and then Sloc (E) > No_Location
463 and then Sloc (N) > No_Location
464
465 -- We ignore references from within an instance
466
467 and then Instantiation_Location (Sloc (N)) = No_Location
468
469 -- Ignore dummy references
470
471 and then Typ /= ' '
472 then
473 if Nkind (N) = N_Identifier
474 or else
475 Nkind (N) = N_Defining_Identifier
476 or else
477 Nkind (N) in N_Op
478 or else
479 Nkind (N) = N_Defining_Operator_Symbol
480 or else
481 Nkind (N) = N_Operator_Symbol
482 or else
483 (Nkind (N) = N_Character_Literal
484 and then Sloc (Entity (N)) /= Standard_Location)
485 or else
486 Nkind (N) = N_Defining_Character_Literal
487 then
488 Nod := N;
489
490 elsif Nkind (N) = N_Expanded_Name
491 or else
492 Nkind (N) = N_Selected_Component
493 then
494 Nod := Selector_Name (N);
495
496 else
497 return;
498 end if;
499
500 -- Normal case of source entity comes from source
501
502 if Comes_From_Source (E) then
503 Ent := E;
504
505 -- Entity does not come from source, but is a derived subprogram
506 -- and the derived subprogram comes from source (after one or more
507 -- derivations) in which case the reference is to parent subprogram.
508
509 elsif Is_Overloadable (E)
510 and then Present (Alias (E))
511 then
512 Ent := Alias (E);
513
514 loop
515 if Comes_From_Source (Ent) then
516 exit;
517 elsif No (Alias (Ent)) then
518 return;
519 else
520 Ent := Alias (Ent);
521 end if;
522 end loop;
523
524 -- The internally created defining entity for a child subprogram
525 -- that has no previous spec has valid references.
526
527 elsif Is_Overloadable (E)
528 and then Is_Child_Unit (E)
529 then
530 Ent := E;
531
532 -- Record components of discriminated subtypes or derived types
533 -- must be treated as references to the original component.
534
535 elsif Ekind (E) = E_Component
536 and then Comes_From_Source (Original_Record_Component (E))
537 then
538 Ent := Original_Record_Component (E);
539
540 -- Ignore reference to any other entity that is not from source
541
542 else
543 return;
544 end if;
545
546 -- Record reference to entity
547
548 Ref := Original_Location (Sloc (Nod));
549 Def := Original_Location (Sloc (Ent));
550
551 Xrefs.Increment_Last;
552 Indx := Xrefs.Last;
553
554 Xrefs.Table (Indx).Loc := Ref;
555
556 -- Overriding operations are marked with 'P'
557
558 if Typ = 'p'
559 and then Is_Subprogram (N)
560 and then Is_Overriding_Operation (N)
561 then
562 Xrefs.Table (Indx).Typ := 'P';
563 else
564 Xrefs.Table (Indx).Typ := Typ;
565 end if;
566
567 Xrefs.Table (Indx).Eun := Get_Source_Unit (Def);
568 Xrefs.Table (Indx).Lun := Get_Source_Unit (Ref);
569 Xrefs.Table (Indx).Ent := Ent;
570 Set_Has_Xref_Entry (Ent);
571 end if;
572 end Generate_Reference;
573
574 -----------------------------------
575 -- Generate_Reference_To_Formals --
576 -----------------------------------
577
578 procedure Generate_Reference_To_Formals (E : Entity_Id) is
579 Formal : Entity_Id;
580
581 begin
582 if Is_Generic_Subprogram (E) then
583 Formal := First_Entity (E);
584
585 while Present (Formal)
586 and then not Is_Formal (Formal)
587 loop
588 Next_Entity (Formal);
589 end loop;
590
591 else
592 Formal := First_Formal (E);
593 end if;
594
595 while Present (Formal) loop
596 if Ekind (Formal) = E_In_Parameter then
597
598 if Nkind (Parameter_Type (Parent (Formal)))
599 = N_Access_Definition
600 then
601 Generate_Reference (E, Formal, '^', False);
602 else
603 Generate_Reference (E, Formal, '>', False);
604 end if;
605
606 elsif Ekind (Formal) = E_In_Out_Parameter then
607 Generate_Reference (E, Formal, '=', False);
608
609 else
610 Generate_Reference (E, Formal, '<', False);
611 end if;
612
613 Next_Formal (Formal);
614 end loop;
615 end Generate_Reference_To_Formals;
616
617 -------------------------------------------
618 -- Generate_Reference_To_Generic_Formals --
619 -------------------------------------------
620
621 procedure Generate_Reference_To_Generic_Formals (E : Entity_Id) is
622 Formal : Entity_Id;
623
624 begin
625 Formal := First_Entity (E);
626
627 while Present (Formal) loop
628 if Comes_From_Source (Formal) then
629 Generate_Reference (E, Formal, 'z', False);
630 end if;
631
632 Next_Entity (Formal);
633 end loop;
634 end Generate_Reference_To_Generic_Formals;
635
636 ----------------
637 -- Initialize --
638 ----------------
639
640 procedure Initialize is
641 begin
642 Xrefs.Init;
643 end Initialize;
644
645 -----------------------
646 -- Output_References --
647 -----------------------
648
649 procedure Output_References is
650
651 procedure Get_Type_Reference
652 (Ent : Entity_Id;
653 Tref : out Entity_Id;
654 Left : out Character;
655 Right : out Character);
656 -- Given an entity id Ent, determines whether a type reference is
657 -- required. If so, Tref is set to the entity for the type reference
658 -- and Left and Right are set to the left/right brackets to be
659 -- output for the reference. If no type reference is required, then
660 -- Tref is set to Empty, and Left/Right are set to space.
661
662 procedure Output_Import_Export_Info (Ent : Entity_Id);
663 -- Ouput language and external name information for an interfaced
664 -- entity, using the format <language, external_name>,
665
666 ------------------------
667 -- Get_Type_Reference --
668 ------------------------
669
670 procedure Get_Type_Reference
671 (Ent : Entity_Id;
672 Tref : out Entity_Id;
673 Left : out Character;
674 Right : out Character)
675 is
676 Sav : Entity_Id;
677
678 begin
679 -- See if we have a type reference
680
681 Tref := Ent;
682 Left := '{';
683 Right := '}';
684
685 loop
686 Sav := Tref;
687
688 -- Processing for types
689
690 if Is_Type (Tref) then
691
692 -- Case of base type
693
694 if Base_Type (Tref) = Tref then
695
696 -- If derived, then get first subtype
697
698 if Tref /= Etype (Tref) then
699 Tref := First_Subtype (Etype (Tref));
700
701 -- Set brackets for derived type, but don't
702 -- override pointer case since the fact that
703 -- something is a pointer is more important
704
705 if Left /= '(' then
706 Left := '<';
707 Right := '>';
708 end if;
709
710 -- If non-derived ptr, get directly designated type.
711 -- If the type has a full view, all references are
712 -- on the partial view, that is seen first.
713
714 elsif Is_Access_Type (Tref) then
715 Tref := Directly_Designated_Type (Tref);
716 Left := '(';
717 Right := ')';
718
719 elsif Is_Private_Type (Tref)
720 and then Present (Full_View (Tref))
721 then
722 if Is_Access_Type (Full_View (Tref)) then
723 Tref := Directly_Designated_Type (Full_View (Tref));
724 Left := '(';
725 Right := ')';
726
727 -- If the full view is an array type, we also retrieve
728 -- the corresponding component type, because the ali
729 -- entry already indicates that this is an array.
730
731 elsif Is_Array_Type (Full_View (Tref)) then
732 Tref := Component_Type (Full_View (Tref));
733 Left := '(';
734 Right := ')';
735 end if;
736
737 -- If non-derived array, get component type.
738 -- Skip component type for case of String
739 -- or Wide_String, saves worthwhile space.
740
741 elsif Is_Array_Type (Tref)
742 and then Tref /= Standard_String
743 and then Tref /= Standard_Wide_String
744 then
745 Tref := Component_Type (Tref);
746 Left := '(';
747 Right := ')';
748
749 -- For other non-derived base types, nothing
750
751 else
752 exit;
753 end if;
754
755 -- For a subtype, go to ancestor subtype
756
757 else
758 Tref := Ancestor_Subtype (Tref);
759
760 -- If no ancestor subtype, go to base type
761
762 if No (Tref) then
763 Tref := Base_Type (Sav);
764 end if;
765 end if;
766
767 -- For objects, functions, enum literals,
768 -- just get type from Etype field.
769
770 elsif Is_Object (Tref)
771 or else Ekind (Tref) = E_Enumeration_Literal
772 or else Ekind (Tref) = E_Function
773 or else Ekind (Tref) = E_Operator
774 then
775 Tref := Etype (Tref);
776
777 -- For anything else, exit
778
779 else
780 exit;
781 end if;
782
783 -- Exit if no type reference, or we are stuck in
784 -- some loop trying to find the type reference, or
785 -- if the type is standard void type (the latter is
786 -- an implementation artifact that should not show
787 -- up in the generated cross-references).
788
789 exit when No (Tref)
790 or else Tref = Sav
791 or else Tref = Standard_Void_Type;
792
793 -- If we have a usable type reference, return, otherwise
794 -- keep looking for something useful (we are looking for
795 -- something that either comes from source or standard)
796
797 if Sloc (Tref) = Standard_Location
798 or else Comes_From_Source (Tref)
799 then
800 -- If the reference is a subtype created for a generic
801 -- actual, go to actual directly, the inner subtype is
802 -- not user visible.
803
804 if Nkind (Parent (Tref)) = N_Subtype_Declaration
805 and then not Comes_From_Source (Parent (Tref))
806 and then
807 (Is_Wrapper_Package (Scope (Tref))
808 or else Is_Generic_Instance (Scope (Tref)))
809 then
810 Tref := First_Subtype (Base_Type (Tref));
811 end if;
812
813 return;
814 end if;
815 end loop;
816
817 -- If we fall through the loop, no type reference
818
819 Tref := Empty;
820 Left := ' ';
821 Right := ' ';
822 end Get_Type_Reference;
823
824 -------------------------------
825 -- Output_Import_Export_Info --
826 -------------------------------
827
828 procedure Output_Import_Export_Info (Ent : Entity_Id) is
829 Language_Name : Name_Id;
830 Conv : constant Convention_Id := Convention (Ent);
831 begin
832 if Conv = Convention_C then
833 Language_Name := Name_C;
834
835 elsif Conv = Convention_CPP then
836 Language_Name := Name_CPP;
837
838 elsif Conv = Convention_Ada then
839 Language_Name := Name_Ada;
840
841 else
842 -- These are the only languages that GPS knows about
843
844 return;
845 end if;
846
847 Write_Info_Char ('<');
848 Get_Unqualified_Name_String (Language_Name);
849
850 for J in 1 .. Name_Len loop
851 Write_Info_Char (Name_Buffer (J));
852 end loop;
853
854 if Present (Interface_Name (Ent)) then
855 Write_Info_Char (',');
856 String_To_Name_Buffer (Strval (Interface_Name (Ent)));
857
858 for J in 1 .. Name_Len loop
859 Write_Info_Char (Name_Buffer (J));
860 end loop;
861 end if;
862
863 Write_Info_Char ('>');
864 end Output_Import_Export_Info;
865
866 -- Start of processing for Output_References
867
868 begin
869 if not Opt.Xref_Active then
870 return;
871 end if;
872
873 -- Before we go ahead and output the references we have a problem
874 -- that needs dealing with. So far we have captured things that are
875 -- definitely referenced by the main unit, or defined in the main
876 -- unit. That's because we don't want to clutter up the ali file
877 -- for this unit with definition lines for entities in other units
878 -- that are not referenced.
879
880 -- But there is a glitch. We may reference an entity in another unit,
881 -- and it may have a type reference to an entity that is not directly
882 -- referenced in the main unit, which may mean that there is no xref
883 -- entry for this entity yet in the list of references.
884
885 -- If we don't do something about this, we will end with an orphan
886 -- type reference, i.e. it will point to an entity that does not
887 -- appear within the generated references in the ali file. That is
888 -- not good for tools using the xref information.
889
890 -- To fix this, we go through the references adding definition
891 -- entries for any unreferenced entities that can be referenced
892 -- in a type reference. There is a recursion problem here, and
893 -- that is dealt with by making sure that this traversal also
894 -- traverses any entries that get added by the traversal.
895
896 declare
897 J : Nat;
898 Tref : Entity_Id;
899 L, R : Character;
900 Indx : Nat;
901 Ent : Entity_Id;
902 Loc : Source_Ptr;
903
904 begin
905 -- Note that this is not a for loop for a very good reason. The
906 -- processing of items in the table can add new items to the
907 -- table, and they must be processed as well
908
909 J := 1;
910 while J <= Xrefs.Last loop
911 Ent := Xrefs.Table (J).Ent;
912 Get_Type_Reference (Ent, Tref, L, R);
913
914 if Present (Tref)
915 and then not Has_Xref_Entry (Tref)
916 and then Sloc (Tref) > No_Location
917 then
918 Xrefs.Increment_Last;
919 Indx := Xrefs.Last;
920 Loc := Original_Location (Sloc (Tref));
921 Xrefs.Table (Indx).Ent := Tref;
922 Xrefs.Table (Indx).Loc := No_Location;
923 Xrefs.Table (Indx).Eun := Get_Source_Unit (Loc);
924 Xrefs.Table (Indx).Lun := No_Unit;
925 Set_Has_Xref_Entry (Tref);
926 end if;
927
928 -- Collect inherited primitive operations that may be
929 -- declared in another unit and have no visible reference
930 -- in the current one.
931
932 if Is_Type (Ent)
933 and then Is_Tagged_Type (Ent)
934 and then Is_Derived_Type (Ent)
935 and then Ent = Base_Type (Ent)
936 and then In_Extended_Main_Source_Unit (Ent)
937 then
938 declare
939 Op_List : constant Elist_Id := Primitive_Operations (Ent);
940 Op : Elmt_Id;
941 Prim : Entity_Id;
942
943 function Parent_Op (E : Entity_Id) return Entity_Id;
944 -- Find original operation, which may be inherited
945 -- through several derivations.
946
947 function Parent_Op (E : Entity_Id) return Entity_Id is
948 Orig_Op : constant Entity_Id := Alias (E);
949 begin
950 if No (Orig_Op) then
951 return Empty;
952 elsif not Comes_From_Source (E)
953 and then not Has_Xref_Entry (Orig_Op)
954 and then Comes_From_Source (Orig_Op)
955 then
956 return Orig_Op;
957 else
958 return Parent_Op (Orig_Op);
959 end if;
960 end Parent_Op;
961
962 begin
963 Op := First_Elmt (Op_List);
964 while Present (Op) loop
965 Prim := Parent_Op (Node (Op));
966
967 if Present (Prim) then
968 Xrefs.Increment_Last;
969 Indx := Xrefs.Last;
970 Loc := Original_Location (Sloc (Prim));
971 Xrefs.Table (Indx).Ent := Prim;
972 Xrefs.Table (Indx).Loc := No_Location;
973 Xrefs.Table (Indx).Eun :=
974 Get_Source_Unit (Sloc (Prim));
975 Xrefs.Table (Indx).Lun := No_Unit;
976 Set_Has_Xref_Entry (Prim);
977 end if;
978
979 Next_Elmt (Op);
980 end loop;
981 end;
982 end if;
983
984 J := J + 1;
985 end loop;
986 end;
987
988 -- Now we have all the references, including those for any embedded
989 -- type references, so we can sort them, and output them.
990
991 Output_Refs : declare
992
993 Nrefs : Nat := Xrefs.Last;
994 -- Number of references in table. This value may get reset
995 -- (reduced) when we eliminate duplicate reference entries.
996
997 Rnums : array (0 .. Nrefs) of Nat;
998 -- This array contains numbers of references in the Xrefs table.
999 -- This list is sorted in output order. The extra 0'th entry is
1000 -- convenient for the call to sort. When we sort the table, we
1001 -- move the entries in Rnums around, but we do not move the
1002 -- original table entries.
1003
1004 Curxu : Unit_Number_Type;
1005 -- Current xref unit
1006
1007 Curru : Unit_Number_Type;
1008 -- Current reference unit for one entity
1009
1010 Cursrc : Source_Buffer_Ptr;
1011 -- Current xref unit source text
1012
1013 Curent : Entity_Id;
1014 -- Current entity
1015
1016 Curnam : String (1 .. Name_Buffer'Length);
1017 Curlen : Natural;
1018 -- Simple name and length of current entity
1019
1020 Curdef : Source_Ptr;
1021 -- Original source location for current entity
1022
1023 Crloc : Source_Ptr;
1024 -- Current reference location
1025
1026 Ctyp : Character;
1027 -- Entity type character
1028
1029 Tref : Entity_Id;
1030 -- Type reference
1031
1032 Rref : Node_Id;
1033 -- Renaming reference
1034
1035 Trunit : Unit_Number_Type;
1036 -- Unit number for type reference
1037
1038 function Lt (Op1, Op2 : Natural) return Boolean;
1039 -- Comparison function for Sort call
1040
1041 function Name_Change (X : Entity_Id) return Boolean;
1042 -- Determines if entity X has a different simple name from Curent
1043
1044 procedure Move (From : Natural; To : Natural);
1045 -- Move procedure for Sort call
1046
1047 --------
1048 -- Lt --
1049 --------
1050
1051 function Lt (Op1, Op2 : Natural) return Boolean is
1052 T1 : Xref_Entry renames Xrefs.Table (Rnums (Nat (Op1)));
1053 T2 : Xref_Entry renames Xrefs.Table (Rnums (Nat (Op2)));
1054
1055 begin
1056 -- First test. If entity is in different unit, sort by unit
1057
1058 if T1.Eun /= T2.Eun then
1059 return Dependency_Num (T1.Eun) < Dependency_Num (T2.Eun);
1060
1061 -- Second test, within same unit, sort by entity Sloc
1062
1063 elsif T1.Def /= T2.Def then
1064 return T1.Def < T2.Def;
1065
1066 -- Third test, sort definitions ahead of references
1067
1068 elsif T1.Loc = No_Location then
1069 return True;
1070
1071 elsif T2.Loc = No_Location then
1072 return False;
1073
1074 -- Fourth test, for same entity, sort by reference location unit
1075
1076 elsif T1.Lun /= T2.Lun then
1077 return Dependency_Num (T1.Lun) < Dependency_Num (T2.Lun);
1078
1079 -- Fifth test order of location within referencing unit
1080
1081 elsif T1.Loc /= T2.Loc then
1082 return T1.Loc < T2.Loc;
1083
1084 -- Finally, for two locations at the same address, we prefer
1085 -- the one that does NOT have the type 'r' so that a modification
1086 -- or extension takes preference, when there are more than one
1087 -- reference at the same location.
1088
1089 else
1090 return T2.Typ = 'r';
1091 end if;
1092 end Lt;
1093
1094 ----------
1095 -- Move --
1096 ----------
1097
1098 procedure Move (From : Natural; To : Natural) is
1099 begin
1100 Rnums (Nat (To)) := Rnums (Nat (From));
1101 end Move;
1102
1103 -----------------
1104 -- Name_Change --
1105 -----------------
1106
1107 function Name_Change (X : Entity_Id) return Boolean is
1108 begin
1109 Get_Unqualified_Name_String (Chars (X));
1110
1111 if Name_Len /= Curlen then
1112 return True;
1113
1114 else
1115 return Name_Buffer (1 .. Curlen) /= Curnam (1 .. Curlen);
1116 end if;
1117 end Name_Change;
1118
1119 -- Start of processing for Output_Refs
1120
1121 begin
1122 -- Capture the definition Sloc values. We delay doing this till now,
1123 -- since at the time the reference or definition is made, private
1124 -- types may be swapped, and the Sloc value may be incorrect. We
1125 -- also set up the pointer vector for the sort.
1126
1127 for J in 1 .. Nrefs loop
1128 Rnums (J) := J;
1129 Xrefs.Table (J).Def :=
1130 Original_Location (Sloc (Xrefs.Table (J).Ent));
1131 end loop;
1132
1133 -- Sort the references
1134
1135 GNAT.Heap_Sort_A.Sort
1136 (Integer (Nrefs),
1137 Move'Unrestricted_Access,
1138 Lt'Unrestricted_Access);
1139
1140 -- Eliminate duplicate entries
1141
1142 declare
1143 NR : constant Nat := Nrefs;
1144
1145 begin
1146 -- We need this test for NR because if we force ALI file
1147 -- generation in case of errors detected, it may be the case
1148 -- that Nrefs is 0, so we should not reset it here
1149
1150 if NR >= 2 then
1151 Nrefs := 1;
1152
1153 for J in 2 .. NR loop
1154 if Xrefs.Table (Rnums (J)) /=
1155 Xrefs.Table (Rnums (Nrefs))
1156 then
1157 Nrefs := Nrefs + 1;
1158 Rnums (Nrefs) := Rnums (J);
1159 end if;
1160 end loop;
1161 end if;
1162 end;
1163
1164 -- Initialize loop through references
1165
1166 Curxu := No_Unit;
1167 Curent := Empty;
1168 Curdef := No_Location;
1169 Curru := No_Unit;
1170 Crloc := No_Location;
1171
1172 -- Loop to output references
1173
1174 for Refno in 1 .. Nrefs loop
1175 Output_One_Ref : declare
1176 P2 : Source_Ptr;
1177 WC : Char_Code;
1178 Err : Boolean;
1179 Ent : Entity_Id;
1180
1181 XE : Xref_Entry renames Xrefs.Table (Rnums (Refno));
1182 -- The current entry to be accessed
1183
1184 P : Source_Ptr;
1185 -- Used to index into source buffer to get entity name
1186
1187 Left : Character;
1188 Right : Character;
1189 -- Used for {} or <> or () for type reference
1190
1191 procedure Output_Instantiation_Refs (Loc : Source_Ptr);
1192 -- Recursive procedure to output instantiation references for
1193 -- the given source ptr in [file|line[...]] form. No output
1194 -- if the given location is not a generic template reference.
1195
1196 procedure Output_Overridden_Op (Old_E : Entity_Id);
1197 -- For a subprogram that is overriding, display information
1198 -- about the inherited operation that it overrides.
1199
1200 -------------------------------
1201 -- Output_Instantiation_Refs --
1202 -------------------------------
1203
1204 procedure Output_Instantiation_Refs (Loc : Source_Ptr) is
1205 Iloc : constant Source_Ptr := Instantiation_Location (Loc);
1206 Lun : Unit_Number_Type;
1207 Cu : constant Unit_Number_Type := Curru;
1208
1209 begin
1210 -- Nothing to do if this is not an instantiation
1211
1212 if Iloc = No_Location then
1213 return;
1214 end if;
1215
1216 -- Output instantiation reference
1217
1218 Write_Info_Char ('[');
1219 Lun := Get_Source_Unit (Iloc);
1220
1221 if Lun /= Curru then
1222 Curru := Lun;
1223 Write_Info_Nat (Dependency_Num (Curru));
1224 Write_Info_Char ('|');
1225 end if;
1226
1227 Write_Info_Nat (Int (Get_Logical_Line_Number (Iloc)));
1228
1229 -- Recursive call to get nested instantiations
1230
1231 Output_Instantiation_Refs (Iloc);
1232
1233 -- Output final ] after call to get proper nesting
1234
1235 Write_Info_Char (']');
1236 Curru := Cu;
1237 return;
1238 end Output_Instantiation_Refs;
1239
1240 --------------------------
1241 -- Output_Overridden_Op --
1242 --------------------------
1243
1244 procedure Output_Overridden_Op (Old_E : Entity_Id) is
1245 begin
1246 if Present (Old_E)
1247 and then Sloc (Old_E) /= Standard_Location
1248 then
1249 declare
1250 Loc : constant Source_Ptr := Sloc (Old_E);
1251 Par_Unit : constant Unit_Number_Type :=
1252 Get_Source_Unit (Loc);
1253 begin
1254 Write_Info_Char ('<');
1255
1256 if Par_Unit /= Curxu then
1257 Write_Info_Nat (Dependency_Num (Par_Unit));
1258 Write_Info_Char ('|');
1259 end if;
1260
1261 Write_Info_Nat (Int (Get_Logical_Line_Number (Loc)));
1262 Write_Info_Char ('p');
1263 Write_Info_Nat (Int (Get_Column_Number (Loc)));
1264 Write_Info_Char ('>');
1265 end;
1266 end if;
1267 end Output_Overridden_Op;
1268
1269 -- Start of processing for Output_One_Ref
1270
1271 begin
1272 Ent := XE.Ent;
1273 Ctyp := Xref_Entity_Letters (Ekind (Ent));
1274
1275 -- Skip reference if it is the only reference to an entity,
1276 -- and it is an end-line reference, and the entity is not in
1277 -- the current extended source. This prevents junk entries
1278 -- consisting only of packages with end lines, where no
1279 -- entity from the package is actually referenced.
1280
1281 if XE.Typ = 'e'
1282 and then Ent /= Curent
1283 and then (Refno = Nrefs or else
1284 Ent /= Xrefs.Table (Rnums (Refno + 1)).Ent)
1285 and then
1286 not In_Extended_Main_Source_Unit (Ent)
1287 then
1288 goto Continue;
1289 end if;
1290
1291 -- For private type, get full view type
1292
1293 if Ctyp = '+'
1294 and then Present (Full_View (XE.Ent))
1295 then
1296 Ent := Underlying_Type (Ent);
1297
1298 if Present (Ent) then
1299 Ctyp := Xref_Entity_Letters (Ekind (Ent));
1300 end if;
1301 end if;
1302
1303 -- Special exception for Boolean
1304
1305 if Ctyp = 'E' and then Is_Boolean_Type (Ent) then
1306 Ctyp := 'B';
1307 end if;
1308
1309 -- For variable reference, get corresponding type
1310
1311 if Ctyp = '*' then
1312 Ent := Etype (XE.Ent);
1313 Ctyp := Fold_Lower (Xref_Entity_Letters (Ekind (Ent)));
1314
1315 -- If variable is private type, get full view type
1316
1317 if Ctyp = '+'
1318 and then Present (Full_View (Etype (XE.Ent)))
1319 then
1320 Ent := Underlying_Type (Etype (XE.Ent));
1321
1322 if Present (Ent) then
1323 Ctyp := Fold_Lower (Xref_Entity_Letters (Ekind (Ent)));
1324 end if;
1325
1326 elsif Is_Generic_Type (Ent) then
1327
1328 -- If the type of the entity is a generic private type
1329 -- there is no usable full view, so retain the indication
1330 -- that this is an object.
1331
1332 Ctyp := '*';
1333 end if;
1334
1335 -- Special handling for access parameter
1336
1337 declare
1338 K : constant Entity_Kind := Ekind (Etype (XE.Ent));
1339
1340 begin
1341 if (K = E_Anonymous_Access_Type
1342 or else
1343 K = E_Anonymous_Access_Subprogram_Type
1344 or else K =
1345 E_Anonymous_Access_Protected_Subprogram_Type)
1346 and then Is_Formal (XE.Ent)
1347 then
1348 Ctyp := 'p';
1349
1350 -- Special handling for Boolean
1351
1352 elsif Ctyp = 'e' and then Is_Boolean_Type (Ent) then
1353 Ctyp := 'b';
1354 end if;
1355 end;
1356 end if;
1357
1358 -- Special handling for abstract types and operations
1359
1360 if Is_Abstract (XE.Ent) then
1361
1362 if Ctyp = 'U' then
1363 Ctyp := 'x'; -- abstract procedure
1364
1365 elsif Ctyp = 'V' then
1366 Ctyp := 'y'; -- abstract function
1367
1368 elsif Ctyp = 'R' then
1369 Ctyp := 'H'; -- abstract type
1370 end if;
1371 end if;
1372
1373 -- Only output reference if interesting type of entity,
1374 -- and suppress self references, except for bodies that
1375 -- act as specs. Also suppress definitions of body formals
1376 -- (we only treat these as references, and the references
1377 -- were separately recorded).
1378
1379 if Ctyp = ' '
1380 or else (XE.Loc = XE.Def
1381 and then
1382 (XE.Typ /= 'b'
1383 or else not Is_Subprogram (XE.Ent)))
1384 or else (Is_Formal (XE.Ent)
1385 and then Present (Spec_Entity (XE.Ent)))
1386 then
1387 null;
1388
1389 else
1390 -- Start new Xref section if new xref unit
1391
1392 if XE.Eun /= Curxu then
1393 if Write_Info_Col > 1 then
1394 Write_Info_EOL;
1395 end if;
1396
1397 Curxu := XE.Eun;
1398 Cursrc := Source_Text (Source_Index (Curxu));
1399
1400 Write_Info_Initiate ('X');
1401 Write_Info_Char (' ');
1402 Write_Info_Nat (Dependency_Num (XE.Eun));
1403 Write_Info_Char (' ');
1404 Write_Info_Name (Reference_Name (Source_Index (XE.Eun)));
1405 end if;
1406
1407 -- Start new Entity line if new entity. Note that we
1408 -- consider two entities the same if they have the same
1409 -- name and source location. This causes entities in
1410 -- instantiations to be treated as though they referred
1411 -- to the template.
1412
1413 if No (Curent)
1414 or else
1415 (XE.Ent /= Curent
1416 and then
1417 (Name_Change (XE.Ent) or else XE.Def /= Curdef))
1418 then
1419 Curent := XE.Ent;
1420 Curdef := XE.Def;
1421
1422 Get_Unqualified_Name_String (Chars (XE.Ent));
1423 Curlen := Name_Len;
1424 Curnam (1 .. Curlen) := Name_Buffer (1 .. Curlen);
1425
1426 if Write_Info_Col > 1 then
1427 Write_Info_EOL;
1428 end if;
1429
1430 -- Write column number information
1431
1432 Write_Info_Nat (Int (Get_Logical_Line_Number (XE.Def)));
1433 Write_Info_Char (Ctyp);
1434 Write_Info_Nat (Int (Get_Column_Number (XE.Def)));
1435
1436 -- Write level information
1437
1438 Write_Level_Info : declare
1439 function Is_Visible_Generic_Entity
1440 (E : Entity_Id) return Boolean;
1441 -- Check whether E is declared in the visible part
1442 -- of a generic package. For source navigation
1443 -- purposes, treat this as a visible entity.
1444
1445 function Is_Private_Record_Component
1446 (E : Entity_Id) return Boolean;
1447 -- Check whether E is a non-inherited component of a
1448 -- private extension. Even if the enclosing record is
1449 -- public, we want to treat the component as private
1450 -- for navigation purposes.
1451
1452 ---------------------------------
1453 -- Is_Private_Record_Component --
1454 ---------------------------------
1455
1456 function Is_Private_Record_Component
1457 (E : Entity_Id) return Boolean
1458 is
1459 S : constant Entity_Id := Scope (E);
1460 begin
1461 return
1462 Ekind (E) = E_Component
1463 and then Nkind (Declaration_Node (S)) =
1464 N_Private_Extension_Declaration
1465 and then Original_Record_Component (E) = E;
1466 end Is_Private_Record_Component;
1467
1468 -------------------------------
1469 -- Is_Visible_Generic_Entity --
1470 -------------------------------
1471
1472 function Is_Visible_Generic_Entity
1473 (E : Entity_Id) return Boolean
1474 is
1475 Par : Node_Id;
1476
1477 begin
1478 if Ekind (Scope (E)) /= E_Generic_Package then
1479 return False;
1480 end if;
1481
1482 Par := Parent (E);
1483 while Present (Par) loop
1484 if
1485 Nkind (Par) = N_Generic_Package_Declaration
1486 then
1487 -- Entity is a generic formal
1488
1489 return False;
1490
1491 elsif
1492 Nkind (Parent (Par)) = N_Package_Specification
1493 then
1494 return
1495 Is_List_Member (Par)
1496 and then List_Containing (Par) =
1497 Visible_Declarations (Parent (Par));
1498 else
1499 Par := Parent (Par);
1500 end if;
1501 end loop;
1502
1503 return False;
1504 end Is_Visible_Generic_Entity;
1505
1506 -- Start of processing for Write_Level_Info
1507
1508 begin
1509 if Is_Hidden (Curent)
1510 or else Is_Private_Record_Component (Curent)
1511 then
1512 Write_Info_Char (' ');
1513
1514 elsif
1515 Is_Public (Curent)
1516 or else Is_Visible_Generic_Entity (Curent)
1517 then
1518 Write_Info_Char ('*');
1519
1520 else
1521 Write_Info_Char (' ');
1522 end if;
1523 end Write_Level_Info;
1524
1525 -- Output entity name. We use the occurrence from the
1526 -- actual source program at the definition point
1527
1528 P := Original_Location (Sloc (XE.Ent));
1529
1530 -- Entity is character literal
1531
1532 if Cursrc (P) = ''' then
1533 Write_Info_Char (Cursrc (P));
1534 Write_Info_Char (Cursrc (P + 1));
1535 Write_Info_Char (Cursrc (P + 2));
1536
1537 -- Entity is operator symbol
1538
1539 elsif Cursrc (P) = '"' or else Cursrc (P) = '%' then
1540 Write_Info_Char (Cursrc (P));
1541
1542 P2 := P;
1543 loop
1544 P2 := P2 + 1;
1545 Write_Info_Char (Cursrc (P2));
1546 exit when Cursrc (P2) = Cursrc (P);
1547 end loop;
1548
1549 -- Entity is identifier
1550
1551 else
1552 loop
1553 if Is_Start_Of_Wide_Char (Cursrc, P) then
1554 Scan_Wide (Cursrc, P, WC, Err);
1555 elsif not Identifier_Char (Cursrc (P)) then
1556 exit;
1557 else
1558 P := P + 1;
1559 end if;
1560 end loop;
1561
1562 for J in
1563 Original_Location (Sloc (XE.Ent)) .. P - 1
1564 loop
1565 Write_Info_Char (Cursrc (J));
1566 end loop;
1567 end if;
1568
1569 -- See if we have a renaming reference
1570
1571 if Is_Object (XE.Ent)
1572 and then Present (Renamed_Object (XE.Ent))
1573 then
1574 Rref := Renamed_Object (XE.Ent);
1575
1576 elsif Is_Overloadable (XE.Ent)
1577 and then Nkind (Parent (Declaration_Node (XE.Ent))) =
1578 N_Subprogram_Renaming_Declaration
1579 then
1580 Rref := Name (Parent (Declaration_Node (XE.Ent)));
1581
1582 elsif Ekind (XE.Ent) = E_Package
1583 and then Nkind (Declaration_Node (XE.Ent)) =
1584 N_Package_Renaming_Declaration
1585 then
1586 Rref := Name (Declaration_Node (XE.Ent));
1587
1588 else
1589 Rref := Empty;
1590 end if;
1591
1592 if Present (Rref) then
1593 if Nkind (Rref) = N_Expanded_Name then
1594 Rref := Selector_Name (Rref);
1595 end if;
1596
1597 if Nkind (Rref) = N_Identifier
1598 or else Nkind (Rref) = N_Operator_Symbol
1599 then
1600 null;
1601
1602 -- For renamed array components, use the array name
1603 -- for the renamed entity, which reflect the fact that
1604 -- in general the whole array is aliased.
1605
1606 elsif Nkind (Rref) = N_Indexed_Component then
1607 if Nkind (Prefix (Rref)) = N_Identifier then
1608 Rref := Prefix (Rref);
1609 elsif Nkind (Prefix (Rref)) = N_Expanded_Name then
1610 Rref := Selector_Name (Prefix (Rref));
1611 else
1612 Rref := Empty;
1613 end if;
1614
1615 else
1616 Rref := Empty;
1617 end if;
1618 end if;
1619
1620 -- Write out renaming reference if we have one
1621
1622 if Present (Rref) then
1623 Write_Info_Char ('=');
1624 Write_Info_Nat
1625 (Int (Get_Logical_Line_Number (Sloc (Rref))));
1626 Write_Info_Char (':');
1627 Write_Info_Nat
1628 (Int (Get_Column_Number (Sloc (Rref))));
1629 end if;
1630
1631 -- Indicate that the entity is in the unit
1632 -- of the current xref xection.
1633
1634 Curru := Curxu;
1635
1636 -- Write out information about generic parent,
1637 -- if entity is an instance.
1638
1639 if Is_Generic_Instance (XE.Ent) then
1640 declare
1641 Gen_Par : constant Entity_Id :=
1642 Generic_Parent
1643 (Specification
1644 (Unit_Declaration_Node (XE.Ent)));
1645 Loc : constant Source_Ptr := Sloc (Gen_Par);
1646 Gen_U : constant Unit_Number_Type :=
1647 Get_Source_Unit (Loc);
1648 begin
1649 Write_Info_Char ('[');
1650 if Curru /= Gen_U then
1651 Write_Info_Nat (Dependency_Num (Gen_U));
1652 Write_Info_Char ('|');
1653 end if;
1654
1655 Write_Info_Nat
1656 (Int (Get_Logical_Line_Number (Loc)));
1657 Write_Info_Char (']');
1658 end;
1659 end if;
1660
1661 -- See if we have a type reference and if so output
1662
1663 Get_Type_Reference (XE.Ent, Tref, Left, Right);
1664
1665 if Present (Tref) then
1666
1667 -- Case of standard entity, output name
1668
1669 if Sloc (Tref) = Standard_Location then
1670 Write_Info_Char (Left);
1671 Write_Info_Name (Chars (Tref));
1672 Write_Info_Char (Right);
1673
1674 -- Case of source entity, output location
1675
1676 else
1677 Write_Info_Char (Left);
1678 Trunit := Get_Source_Unit (Sloc (Tref));
1679
1680 if Trunit /= Curxu then
1681 Write_Info_Nat (Dependency_Num (Trunit));
1682 Write_Info_Char ('|');
1683 end if;
1684
1685 Write_Info_Nat
1686 (Int (Get_Logical_Line_Number (Sloc (Tref))));
1687
1688 declare
1689 Ent : Entity_Id := Tref;
1690 Kind : constant Entity_Kind := Ekind (Ent);
1691 Ctyp : Character := Xref_Entity_Letters (Kind);
1692
1693 begin
1694 if Ctyp = '+'
1695 and then Present (Full_View (Ent))
1696 then
1697 Ent := Underlying_Type (Ent);
1698
1699 if Present (Ent) then
1700 Ctyp := Xref_Entity_Letters (Ekind (Ent));
1701 end if;
1702 end if;
1703
1704 Write_Info_Char (Ctyp);
1705 end;
1706
1707 Write_Info_Nat
1708 (Int (Get_Column_Number (Sloc (Tref))));
1709
1710 -- If the type comes from an instantiation,
1711 -- add the corresponding info.
1712
1713 Output_Instantiation_Refs (Sloc (Tref));
1714 Write_Info_Char (Right);
1715 end if;
1716 end if;
1717
1718 -- If the entity is an overriding operation, write
1719 -- info on operation that was overridden.
1720
1721 if Is_Subprogram (XE.Ent)
1722 and then Is_Overriding_Operation (XE.Ent)
1723 then
1724 Output_Overridden_Op (Overridden_Operation (XE.Ent));
1725 end if;
1726
1727 -- End of processing for entity output
1728
1729 Crloc := No_Location;
1730 end if;
1731
1732 -- Output the reference
1733
1734 if XE.Loc /= No_Location
1735 and then XE.Loc /= Crloc
1736 then
1737 Crloc := XE.Loc;
1738
1739 -- Start continuation if line full, else blank
1740
1741 if Write_Info_Col > 72 then
1742 Write_Info_EOL;
1743 Write_Info_Initiate ('.');
1744 end if;
1745
1746 Write_Info_Char (' ');
1747
1748 -- Output file number if changed
1749
1750 if XE.Lun /= Curru then
1751 Curru := XE.Lun;
1752 Write_Info_Nat (Dependency_Num (Curru));
1753 Write_Info_Char ('|');
1754 end if;
1755
1756 Write_Info_Nat (Int (Get_Logical_Line_Number (XE.Loc)));
1757 Write_Info_Char (XE.Typ);
1758
1759 if Is_Overloadable (XE.Ent)
1760 and then Is_Imported (XE.Ent)
1761 and then XE.Typ = 'b'
1762 then
1763 Output_Import_Export_Info (XE.Ent);
1764 end if;
1765
1766 Write_Info_Nat (Int (Get_Column_Number (XE.Loc)));
1767
1768 Output_Instantiation_Refs (Sloc (XE.Ent));
1769 end if;
1770 end if;
1771 end Output_One_Ref;
1772
1773 <<Continue>>
1774 null;
1775 end loop;
1776
1777 Write_Info_EOL;
1778 end Output_Refs;
1779 end Output_References;
1780
1781 end Lib.Xref;
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