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2005-12-29 Paul Brook <paul@codesourcery.com>
[official-gcc.git] / gcc / ada / lib-xref.adb
blob1d0c8cbdc09e1798e274dd7bbe02b73878d2aa73
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) 1998-2005, 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 an assignment statement, check whether
264 -- N is its name.
265
266 return Name (Parent (N)) = N;
267 end Is_On_LHS;
268
269 -- Start of processing for Generate_Reference
270
271 begin
272 pragma Assert (Nkind (E) in N_Entity);
273
274 -- Check for obsolescent reference to ASCII
275
276 if E = Standard_ASCII then
277 Check_Restriction (No_Obsolescent_Features, N);
278 end if;
279
280 -- Warn if reference to Ada 2005 entity not in Ada 2005 mode
281
282 if Is_Ada_2005 (E)
283 and then Ada_Version < Ada_05
284 and then Warn_On_Ada_2005_Compatibility
285 then
286 Error_Msg_NE ("& is only defined in Ada 2005?", N, E);
287 end if;
288
289 -- Never collect references if not in main source unit. However,
290 -- we omit this test if Typ is 'e' or 'k', since these entries are
291 -- really structural, and it is useful to have them in units
292 -- that reference packages as well as units that define packages.
293 -- We also omit the test for the case of 'p' since we want to
294 -- include inherited primitive operations from other packages.
295
296 if not In_Extended_Main_Source_Unit (N)
297 and then Typ /= 'e'
298 and then Typ /= 'p'
299 and then Typ /= 'k'
300 then
301 return;
302 end if;
303
304 -- For reference type p, the entity must be in main source unit
305
306 if Typ = 'p' and then not In_Extended_Main_Source_Unit (E) then
307 return;
308 end if;
309
310 -- Unless the reference is forced, we ignore references where
311 -- the reference itself does not come from Source.
312
313 if not Force and then not Comes_From_Source (N) then
314 return;
315 end if;
316
317 -- Deal with setting entity as referenced, unless suppressed.
318 -- Note that we still do Set_Referenced on entities that do not
319 -- come from source. This situation arises when we have a source
320 -- reference to a derived operation, where the derived operation
321 -- itself does not come from source, but we still want to mark it
322 -- as referenced, since we really are referencing an entity in the
323 -- corresponding package (this avoids incorrect complaints that the
324 -- package contains no referenced entities).
325
326 if Set_Ref then
327
328 -- For a variable that appears on the left side of an
329 -- assignment statement, we set the Referenced_As_LHS
330 -- flag since this is indeed a left hand side.
331 -- We also set the Referenced_As_LHS flag of a prefix
332 -- of selected or indexed component.
333
334 if Ekind (E) = E_Variable
335 and then Is_On_LHS (N)
336 then
337 Set_Referenced_As_LHS (E);
338
339 -- Check for a reference in a pragma that should not count as a
340 -- making the variable referenced for warning purposes.
341
342 elsif Is_Non_Significant_Pragma_Reference (N) then
343 null;
344
345 -- A reference in an attribute definition clause does not
346 -- count as a reference except for the case of Address.
347 -- The reason that 'Address is an exception is that it
348 -- creates an alias through which the variable may be
349 -- referenced.
350
351 elsif Nkind (Parent (N)) = N_Attribute_Definition_Clause
352 and then Chars (Parent (N)) /= Name_Address
353 and then N = Name (Parent (N))
354 then
355 null;
356
357 -- Constant completion does not count as a reference
358
359 elsif Typ = 'c'
360 and then Ekind (E) = E_Constant
361 then
362 null;
363
364 -- Record representation clause does not count as a reference
365
366 elsif Nkind (N) = N_Identifier
367 and then Nkind (Parent (N)) = N_Record_Representation_Clause
368 then
369 null;
370
371 -- Discriminants do not need to produce a reference to record type
372
373 elsif Typ = 'd'
374 and then Nkind (Parent (N)) = N_Discriminant_Specification
375 then
376 null;
377
378 -- Any other occurrence counts as referencing the entity
379
380 else
381 Set_Referenced (E);
382 end if;
383
384 -- Check for pragma Unreferenced given and reference is within
385 -- this source unit (occasion for possible warning to be issued)
386
387 if Has_Pragma_Unreferenced (E)
388 and then In_Same_Extended_Unit (E, N)
389 then
390 -- A reference as a named parameter in a call does not count
391 -- as a violation of pragma Unreferenced for this purpose.
392
393 if Nkind (N) = N_Identifier
394 and then Nkind (Parent (N)) = N_Parameter_Association
395 and then Selector_Name (Parent (N)) = N
396 then
397 null;
398
399 -- Neither does a reference to a variable on the left side
400 -- of an assignment
401
402 elsif Ekind (E) = E_Variable
403 and then Nkind (Parent (N)) = N_Assignment_Statement
404 and then Name (Parent (N)) = N
405 then
406 null;
407
408 -- For entry formals, we want to place the warning on the
409 -- corresponding entity in the accept statement. The current
410 -- scope is the body of the accept, so we find the formal
411 -- whose name matches that of the entry formal (there is no
412 -- link between the two entities, and the one in the accept
413 -- statement is only used for conformance checking).
414
415 elsif Ekind (Scope (E)) = E_Entry then
416 declare
417 BE : Entity_Id;
418
419 begin
420 BE := First_Entity (Current_Scope);
421 while Present (BE) loop
422 if Chars (BE) = Chars (E) then
423 Error_Msg_NE
424 ("?pragma Unreferenced given for&", N, BE);
425 exit;
426 end if;
427
428 Next_Entity (BE);
429 end loop;
430 end;
431
432 -- Here we issue the warning, since this is a real reference
433
434 else
435 Error_Msg_NE ("?pragma Unreferenced given for&", N, E);
436 end if;
437 end if;
438
439 -- If this is a subprogram instance, mark as well the internal
440 -- subprogram in the wrapper package, which may be a visible
441 -- compilation unit.
442
443 if Is_Overloadable (E)
444 and then Is_Generic_Instance (E)
445 and then Present (Alias (E))
446 then
447 Set_Referenced (Alias (E));
448 end if;
449 end if;
450
451 -- Generate reference if all conditions are met:
452
453 if
454 -- Cross referencing must be active
455
456 Opt.Xref_Active
457
458 -- The entity must be one for which we collect references
459
460 and then Xref_Entity_Letters (Ekind (E)) /= ' '
461
462 -- Both Sloc values must be set to something sensible
463
464 and then Sloc (E) > No_Location
465 and then Sloc (N) > No_Location
466
467 -- We ignore references from within an instance
468
469 and then Instantiation_Location (Sloc (N)) = No_Location
470
471 -- Ignore dummy references
472
473 and then Typ /= ' '
474 then
475 if Nkind (N) = N_Identifier
476 or else
477 Nkind (N) = N_Defining_Identifier
478 or else
479 Nkind (N) in N_Op
480 or else
481 Nkind (N) = N_Defining_Operator_Symbol
482 or else
483 Nkind (N) = N_Operator_Symbol
484 or else
485 (Nkind (N) = N_Character_Literal
486 and then Sloc (Entity (N)) /= Standard_Location)
487 or else
488 Nkind (N) = N_Defining_Character_Literal
489 then
490 Nod := N;
491
492 elsif Nkind (N) = N_Expanded_Name
493 or else
494 Nkind (N) = N_Selected_Component
495 then
496 Nod := Selector_Name (N);
497
498 else
499 return;
500 end if;
501
502 -- Normal case of source entity comes from source
503
504 if Comes_From_Source (E) then
505 Ent := E;
506
507 -- Entity does not come from source, but is a derived subprogram
508 -- and the derived subprogram comes from source (after one or more
509 -- derivations) in which case the reference is to parent subprogram.
510
511 elsif Is_Overloadable (E)
512 and then Present (Alias (E))
513 then
514 Ent := Alias (E);
515
516 loop
517 if Comes_From_Source (Ent) then
518 exit;
519 elsif No (Alias (Ent)) then
520 return;
521 else
522 Ent := Alias (Ent);
523 end if;
524 end loop;
525
526 -- The internally created defining entity for a child subprogram
527 -- that has no previous spec has valid references.
528
529 elsif Is_Overloadable (E)
530 and then Is_Child_Unit (E)
531 then
532 Ent := E;
533
534 -- Record components of discriminated subtypes or derived types
535 -- must be treated as references to the original component.
536
537 elsif Ekind (E) = E_Component
538 and then Comes_From_Source (Original_Record_Component (E))
539 then
540 Ent := Original_Record_Component (E);
541
542 -- Ignore reference to any other entity that is not from source
543
544 else
545 return;
546 end if;
547
548 -- Record reference to entity
549
550 Ref := Original_Location (Sloc (Nod));
551 Def := Original_Location (Sloc (Ent));
552
553 Xrefs.Increment_Last;
554 Indx := Xrefs.Last;
555
556 Xrefs.Table (Indx).Loc := Ref;
557
558 -- Overriding operations are marked with 'P'
559
560 if Typ = 'p'
561 and then Is_Subprogram (N)
562 and then Is_Overriding_Operation (N)
563 then
564 Xrefs.Table (Indx).Typ := 'P';
565 else
566 Xrefs.Table (Indx).Typ := Typ;
567 end if;
568
569 Xrefs.Table (Indx).Eun := Get_Source_Unit (Def);
570 Xrefs.Table (Indx).Lun := Get_Source_Unit (Ref);
571 Xrefs.Table (Indx).Ent := Ent;
572 Set_Has_Xref_Entry (Ent);
573 end if;
574 end Generate_Reference;
575
576 -----------------------------------
577 -- Generate_Reference_To_Formals --
578 -----------------------------------
579
580 procedure Generate_Reference_To_Formals (E : Entity_Id) is
581 Formal : Entity_Id;
582
583 begin
584 if Is_Generic_Subprogram (E) then
585 Formal := First_Entity (E);
586
587 while Present (Formal)
588 and then not Is_Formal (Formal)
589 loop
590 Next_Entity (Formal);
591 end loop;
592
593 else
594 Formal := First_Formal (E);
595 end if;
596
597 while Present (Formal) loop
598 if Ekind (Formal) = E_In_Parameter then
599
600 if Nkind (Parameter_Type (Parent (Formal)))
601 = N_Access_Definition
602 then
603 Generate_Reference (E, Formal, '^', False);
604 else
605 Generate_Reference (E, Formal, '>', False);
606 end if;
607
608 elsif Ekind (Formal) = E_In_Out_Parameter then
609 Generate_Reference (E, Formal, '=', False);
610
611 else
612 Generate_Reference (E, Formal, '<', False);
613 end if;
614
615 Next_Formal (Formal);
616 end loop;
617 end Generate_Reference_To_Formals;
618
619 -------------------------------------------
620 -- Generate_Reference_To_Generic_Formals --
621 -------------------------------------------
622
623 procedure Generate_Reference_To_Generic_Formals (E : Entity_Id) is
624 Formal : Entity_Id;
625
626 begin
627 Formal := First_Entity (E);
628
629 while Present (Formal) loop
630 if Comes_From_Source (Formal) then
631 Generate_Reference (E, Formal, 'z', False);
632 end if;
633
634 Next_Entity (Formal);
635 end loop;
636 end Generate_Reference_To_Generic_Formals;
637
638 ----------------
639 -- Initialize --
640 ----------------
641
642 procedure Initialize is
643 begin
644 Xrefs.Init;
645 end Initialize;
646
647 -----------------------
648 -- Output_References --
649 -----------------------
650
651 procedure Output_References is
652
653 procedure Get_Type_Reference
654 (Ent : Entity_Id;
655 Tref : out Entity_Id;
656 Left : out Character;
657 Right : out Character);
658 -- Given an entity id Ent, determines whether a type reference is
659 -- required. If so, Tref is set to the entity for the type reference
660 -- and Left and Right are set to the left/right brackets to be
661 -- output for the reference. If no type reference is required, then
662 -- Tref is set to Empty, and Left/Right are set to space.
663
664 procedure Output_Import_Export_Info (Ent : Entity_Id);
665 -- Ouput language and external name information for an interfaced
666 -- entity, using the format <language, external_name>,
667
668 ------------------------
669 -- Get_Type_Reference --
670 ------------------------
671
672 procedure Get_Type_Reference
673 (Ent : Entity_Id;
674 Tref : out Entity_Id;
675 Left : out Character;
676 Right : out Character)
677 is
678 Sav : Entity_Id;
679
680 begin
681 -- See if we have a type reference
682
683 Tref := Ent;
684 Left := '{';
685 Right := '}';
686
687 loop
688 Sav := Tref;
689
690 -- Processing for types
691
692 if Is_Type (Tref) then
693
694 -- Case of base type
695
696 if Base_Type (Tref) = Tref then
697
698 -- If derived, then get first subtype
699
700 if Tref /= Etype (Tref) then
701 Tref := First_Subtype (Etype (Tref));
702
703 -- Set brackets for derived type, but don't
704 -- override pointer case since the fact that
705 -- something is a pointer is more important
706
707 if Left /= '(' then
708 Left := '<';
709 Right := '>';
710 end if;
711
712 -- If non-derived ptr, get directly designated type.
713 -- If the type has a full view, all references are
714 -- on the partial view, that is seen first.
715
716 elsif Is_Access_Type (Tref) then
717 Tref := Directly_Designated_Type (Tref);
718 Left := '(';
719 Right := ')';
720
721 elsif Is_Private_Type (Tref)
722 and then Present (Full_View (Tref))
723 and then Is_Access_Type (Full_View (Tref))
724 then
725 Tref := Directly_Designated_Type (Full_View (Tref));
726 Left := '(';
727 Right := ')';
728
729 -- If non-derived array, get component type.
730 -- Skip component type for case of String
731 -- or Wide_String, saves worthwhile space.
732
733 elsif Is_Array_Type (Tref)
734 and then Tref /= Standard_String
735 and then Tref /= Standard_Wide_String
736 then
737 Tref := Component_Type (Tref);
738 Left := '(';
739 Right := ')';
740
741 -- For other non-derived base types, nothing
742
743 else
744 exit;
745 end if;
746
747 -- For a subtype, go to ancestor subtype
748
749 else
750 Tref := Ancestor_Subtype (Tref);
751
752 -- If no ancestor subtype, go to base type
753
754 if No (Tref) then
755 Tref := Base_Type (Sav);
756 end if;
757 end if;
758
759 -- For objects, functions, enum literals,
760 -- just get type from Etype field.
761
762 elsif Is_Object (Tref)
763 or else Ekind (Tref) = E_Enumeration_Literal
764 or else Ekind (Tref) = E_Function
765 or else Ekind (Tref) = E_Operator
766 then
767 Tref := Etype (Tref);
768
769 -- For anything else, exit
770
771 else
772 exit;
773 end if;
774
775 -- Exit if no type reference, or we are stuck in
776 -- some loop trying to find the type reference, or
777 -- if the type is standard void type (the latter is
778 -- an implementation artifact that should not show
779 -- up in the generated cross-references).
780
781 exit when No (Tref)
782 or else Tref = Sav
783 or else Tref = Standard_Void_Type;
784
785 -- If we have a usable type reference, return, otherwise
786 -- keep looking for something useful (we are looking for
787 -- something that either comes from source or standard)
788
789 if Sloc (Tref) = Standard_Location
790 or else Comes_From_Source (Tref)
791 then
792 -- If the reference is a subtype created for a generic
793 -- actual, go to actual directly, the inner subtype is
794 -- not user visible.
795
796 if Nkind (Parent (Tref)) = N_Subtype_Declaration
797 and then not Comes_From_Source (Parent (Tref))
798 and then
799 (Is_Wrapper_Package (Scope (Tref))
800 or else Is_Generic_Instance (Scope (Tref)))
801 then
802 Tref := First_Subtype (Base_Type (Tref));
803 end if;
804
805 return;
806 end if;
807 end loop;
808
809 -- If we fall through the loop, no type reference
810
811 Tref := Empty;
812 Left := ' ';
813 Right := ' ';
814 end Get_Type_Reference;
815
816 -------------------------------
817 -- Output_Import_Export_Info --
818 -------------------------------
819
820 procedure Output_Import_Export_Info (Ent : Entity_Id) is
821 Language_Name : Name_Id;
822 Conv : constant Convention_Id := Convention (Ent);
823 begin
824 if Conv = Convention_C then
825 Language_Name := Name_C;
826
827 elsif Conv = Convention_CPP then
828 Language_Name := Name_CPP;
829
830 elsif Conv = Convention_Ada then
831 Language_Name := Name_Ada;
832
833 else
834 -- These are the only languages that GPS knows about
835
836 return;
837 end if;
838
839 Write_Info_Char ('<');
840 Get_Unqualified_Name_String (Language_Name);
841
842 for J in 1 .. Name_Len loop
843 Write_Info_Char (Name_Buffer (J));
844 end loop;
845
846 if Present (Interface_Name (Ent)) then
847 Write_Info_Char (',');
848 String_To_Name_Buffer (Strval (Interface_Name (Ent)));
849
850 for J in 1 .. Name_Len loop
851 Write_Info_Char (Name_Buffer (J));
852 end loop;
853 end if;
854
855 Write_Info_Char ('>');
856 end Output_Import_Export_Info;
857
858 -- Start of processing for Output_References
859
860 begin
861 if not Opt.Xref_Active then
862 return;
863 end if;
864
865 -- Before we go ahead and output the references we have a problem
866 -- that needs dealing with. So far we have captured things that are
867 -- definitely referenced by the main unit, or defined in the main
868 -- unit. That's because we don't want to clutter up the ali file
869 -- for this unit with definition lines for entities in other units
870 -- that are not referenced.
871
872 -- But there is a glitch. We may reference an entity in another unit,
873 -- and it may have a type reference to an entity that is not directly
874 -- referenced in the main unit, which may mean that there is no xref
875 -- entry for this entity yet in the list of references.
876
877 -- If we don't do something about this, we will end with an orphan
878 -- type reference, i.e. it will point to an entity that does not
879 -- appear within the generated references in the ali file. That is
880 -- not good for tools using the xref information.
881
882 -- To fix this, we go through the references adding definition
883 -- entries for any unreferenced entities that can be referenced
884 -- in a type reference. There is a recursion problem here, and
885 -- that is dealt with by making sure that this traversal also
886 -- traverses any entries that get added by the traversal.
887
888 declare
889 J : Nat;
890 Tref : Entity_Id;
891 L, R : Character;
892 Indx : Nat;
893 Ent : Entity_Id;
894 Loc : Source_Ptr;
895
896 begin
897 -- Note that this is not a for loop for a very good reason. The
898 -- processing of items in the table can add new items to the
899 -- table, and they must be processed as well
900
901 J := 1;
902 while J <= Xrefs.Last loop
903 Ent := Xrefs.Table (J).Ent;
904 Get_Type_Reference (Ent, Tref, L, R);
905
906 if Present (Tref)
907 and then not Has_Xref_Entry (Tref)
908 and then Sloc (Tref) > No_Location
909 then
910 Xrefs.Increment_Last;
911 Indx := Xrefs.Last;
912 Loc := Original_Location (Sloc (Tref));
913 Xrefs.Table (Indx).Ent := Tref;
914 Xrefs.Table (Indx).Loc := No_Location;
915 Xrefs.Table (Indx).Eun := Get_Source_Unit (Loc);
916 Xrefs.Table (Indx).Lun := No_Unit;
917 Set_Has_Xref_Entry (Tref);
918 end if;
919
920 -- Collect inherited primitive operations that may be
921 -- declared in another unit and have no visible reference
922 -- in the current one.
923
924 if Is_Type (Ent)
925 and then Is_Tagged_Type (Ent)
926 and then Is_Derived_Type (Ent)
927 and then Ent = Base_Type (Ent)
928 and then In_Extended_Main_Source_Unit (Ent)
929 then
930 declare
931 Op_List : constant Elist_Id := Primitive_Operations (Ent);
932 Op : Elmt_Id;
933 Prim : Entity_Id;
934
935 function Parent_Op (E : Entity_Id) return Entity_Id;
936 -- Find original operation, which may be inherited
937 -- through several derivations.
938
939 function Parent_Op (E : Entity_Id) return Entity_Id is
940 Orig_Op : constant Entity_Id := Alias (E);
941 begin
942 if No (Orig_Op) then
943 return Empty;
944 elsif not Comes_From_Source (E)
945 and then not Has_Xref_Entry (Orig_Op)
946 and then Comes_From_Source (Orig_Op)
947 then
948 return Orig_Op;
949 else
950 return Parent_Op (Orig_Op);
951 end if;
952 end Parent_Op;
953
954 begin
955 Op := First_Elmt (Op_List);
956 while Present (Op) loop
957 Prim := Parent_Op (Node (Op));
958
959 if Present (Prim) then
960 Xrefs.Increment_Last;
961 Indx := Xrefs.Last;
962 Loc := Original_Location (Sloc (Prim));
963 Xrefs.Table (Indx).Ent := Prim;
964 Xrefs.Table (Indx).Loc := No_Location;
965 Xrefs.Table (Indx).Eun :=
966 Get_Source_Unit (Sloc (Prim));
967 Xrefs.Table (Indx).Lun := No_Unit;
968 Set_Has_Xref_Entry (Prim);
969 end if;
970
971 Next_Elmt (Op);
972 end loop;
973 end;
974 end if;
975
976 J := J + 1;
977 end loop;
978 end;
979
980 -- Now we have all the references, including those for any embedded
981 -- type references, so we can sort them, and output them.
982
983 Output_Refs : declare
984
985 Nrefs : Nat := Xrefs.Last;
986 -- Number of references in table. This value may get reset
987 -- (reduced) when we eliminate duplicate reference entries.
988
989 Rnums : array (0 .. Nrefs) of Nat;
990 -- This array contains numbers of references in the Xrefs table.
991 -- This list is sorted in output order. The extra 0'th entry is
992 -- convenient for the call to sort. When we sort the table, we
993 -- move the entries in Rnums around, but we do not move the
994 -- original table entries.
995
996 Curxu : Unit_Number_Type;
997 -- Current xref unit
998
999 Curru : Unit_Number_Type;
1000 -- Current reference unit for one entity
1001
1002 Cursrc : Source_Buffer_Ptr;
1003 -- Current xref unit source text
1004
1005 Curent : Entity_Id;
1006 -- Current entity
1007
1008 Curnam : String (1 .. Name_Buffer'Length);
1009 Curlen : Natural;
1010 -- Simple name and length of current entity
1011
1012 Curdef : Source_Ptr;
1013 -- Original source location for current entity
1014
1015 Crloc : Source_Ptr;
1016 -- Current reference location
1017
1018 Ctyp : Character;
1019 -- Entity type character
1020
1021 Tref : Entity_Id;
1022 -- Type reference
1023
1024 Rref : Node_Id;
1025 -- Renaming reference
1026
1027 Trunit : Unit_Number_Type;
1028 -- Unit number for type reference
1029
1030 function Lt (Op1, Op2 : Natural) return Boolean;
1031 -- Comparison function for Sort call
1032
1033 function Name_Change (X : Entity_Id) return Boolean;
1034 -- Determines if entity X has a different simple name from Curent
1035
1036 procedure Move (From : Natural; To : Natural);
1037 -- Move procedure for Sort call
1038
1039 --------
1040 -- Lt --
1041 --------
1042
1043 function Lt (Op1, Op2 : Natural) return Boolean is
1044 T1 : Xref_Entry renames Xrefs.Table (Rnums (Nat (Op1)));
1045 T2 : Xref_Entry renames Xrefs.Table (Rnums (Nat (Op2)));
1046
1047 begin
1048 -- First test. If entity is in different unit, sort by unit
1049
1050 if T1.Eun /= T2.Eun then
1051 return Dependency_Num (T1.Eun) < Dependency_Num (T2.Eun);
1052
1053 -- Second test, within same unit, sort by entity Sloc
1054
1055 elsif T1.Def /= T2.Def then
1056 return T1.Def < T2.Def;
1057
1058 -- Third test, sort definitions ahead of references
1059
1060 elsif T1.Loc = No_Location then
1061 return True;
1062
1063 elsif T2.Loc = No_Location then
1064 return False;
1065
1066 -- Fourth test, for same entity, sort by reference location unit
1067
1068 elsif T1.Lun /= T2.Lun then
1069 return Dependency_Num (T1.Lun) < Dependency_Num (T2.Lun);
1070
1071 -- Fifth test order of location within referencing unit
1072
1073 elsif T1.Loc /= T2.Loc then
1074 return T1.Loc < T2.Loc;
1075
1076 -- Finally, for two locations at the same address, we prefer
1077 -- the one that does NOT have the type 'r' so that a modification
1078 -- or extension takes preference, when there are more than one
1079 -- reference at the same location.
1080
1081 else
1082 return T2.Typ = 'r';
1083 end if;
1084 end Lt;
1085
1086 ----------
1087 -- Move --
1088 ----------
1089
1090 procedure Move (From : Natural; To : Natural) is
1091 begin
1092 Rnums (Nat (To)) := Rnums (Nat (From));
1093 end Move;
1094
1095 -----------------
1096 -- Name_Change --
1097 -----------------
1098
1099 function Name_Change (X : Entity_Id) return Boolean is
1100 begin
1101 Get_Unqualified_Name_String (Chars (X));
1102
1103 if Name_Len /= Curlen then
1104 return True;
1105
1106 else
1107 return Name_Buffer (1 .. Curlen) /= Curnam (1 .. Curlen);
1108 end if;
1109 end Name_Change;
1110
1111 -- Start of processing for Output_Refs
1112
1113 begin
1114 -- Capture the definition Sloc values. We delay doing this till now,
1115 -- since at the time the reference or definition is made, private
1116 -- types may be swapped, and the Sloc value may be incorrect. We
1117 -- also set up the pointer vector for the sort.
1118
1119 for J in 1 .. Nrefs loop
1120 Rnums (J) := J;
1121 Xrefs.Table (J).Def :=
1122 Original_Location (Sloc (Xrefs.Table (J).Ent));
1123 end loop;
1124
1125 -- Sort the references
1126
1127 GNAT.Heap_Sort_A.Sort
1128 (Integer (Nrefs),
1129 Move'Unrestricted_Access,
1130 Lt'Unrestricted_Access);
1131
1132 -- Eliminate duplicate entries
1133
1134 declare
1135 NR : constant Nat := Nrefs;
1136
1137 begin
1138 -- We need this test for NR because if we force ALI file
1139 -- generation in case of errors detected, it may be the case
1140 -- that Nrefs is 0, so we should not reset it here
1141
1142 if NR >= 2 then
1143 Nrefs := 1;
1144
1145 for J in 2 .. NR loop
1146 if Xrefs.Table (Rnums (J)) /=
1147 Xrefs.Table (Rnums (Nrefs))
1148 then
1149 Nrefs := Nrefs + 1;
1150 Rnums (Nrefs) := Rnums (J);
1151 end if;
1152 end loop;
1153 end if;
1154 end;
1155
1156 -- Initialize loop through references
1157
1158 Curxu := No_Unit;
1159 Curent := Empty;
1160 Curdef := No_Location;
1161 Curru := No_Unit;
1162 Crloc := No_Location;
1163
1164 -- Loop to output references
1165
1166 for Refno in 1 .. Nrefs loop
1167 Output_One_Ref : declare
1168 P2 : Source_Ptr;
1169 WC : Char_Code;
1170 Err : Boolean;
1171 Ent : Entity_Id;
1172
1173 XE : Xref_Entry renames Xrefs.Table (Rnums (Refno));
1174 -- The current entry to be accessed
1175
1176 P : Source_Ptr;
1177 -- Used to index into source buffer to get entity name
1178
1179 Left : Character;
1180 Right : Character;
1181 -- Used for {} or <> or () for type reference
1182
1183 procedure Output_Instantiation_Refs (Loc : Source_Ptr);
1184 -- Recursive procedure to output instantiation references for
1185 -- the given source ptr in [file|line[...]] form. No output
1186 -- if the given location is not a generic template reference.
1187
1188 procedure Output_Overridden_Op (Old_E : Entity_Id);
1189 -- For a subprogram that is overriding, display information
1190 -- about the inherited operation that it overrides.
1191
1192 -------------------------------
1193 -- Output_Instantiation_Refs --
1194 -------------------------------
1195
1196 procedure Output_Instantiation_Refs (Loc : Source_Ptr) is
1197 Iloc : constant Source_Ptr := Instantiation_Location (Loc);
1198 Lun : Unit_Number_Type;
1199 Cu : constant Unit_Number_Type := Curru;
1200
1201 begin
1202 -- Nothing to do if this is not an instantiation
1203
1204 if Iloc = No_Location then
1205 return;
1206 end if;
1207
1208 -- Output instantiation reference
1209
1210 Write_Info_Char ('[');
1211 Lun := Get_Source_Unit (Iloc);
1212
1213 if Lun /= Curru then
1214 Curru := Lun;
1215 Write_Info_Nat (Dependency_Num (Curru));
1216 Write_Info_Char ('|');
1217 end if;
1218
1219 Write_Info_Nat (Int (Get_Logical_Line_Number (Iloc)));
1220
1221 -- Recursive call to get nested instantiations
1222
1223 Output_Instantiation_Refs (Iloc);
1224
1225 -- Output final ] after call to get proper nesting
1226
1227 Write_Info_Char (']');
1228 Curru := Cu;
1229 return;
1230 end Output_Instantiation_Refs;
1231
1232 --------------------------
1233 -- Output_Overridden_Op --
1234 --------------------------
1235
1236 procedure Output_Overridden_Op (Old_E : Entity_Id) is
1237 begin
1238 if Present (Old_E)
1239 and then Sloc (Old_E) /= Standard_Location
1240 then
1241 declare
1242 Loc : constant Source_Ptr := Sloc (Old_E);
1243 Par_Unit : constant Unit_Number_Type :=
1244 Get_Source_Unit (Loc);
1245 begin
1246 Write_Info_Char ('<');
1247
1248 if Par_Unit /= Curxu then
1249 Write_Info_Nat (Dependency_Num (Par_Unit));
1250 Write_Info_Char ('|');
1251 end if;
1252
1253 Write_Info_Nat (Int (Get_Logical_Line_Number (Loc)));
1254 Write_Info_Char ('p');
1255 Write_Info_Nat (Int (Get_Column_Number (Loc)));
1256 Write_Info_Char ('>');
1257 end;
1258 end if;
1259 end Output_Overridden_Op;
1260
1261 -- Start of processing for Output_One_Ref
1262
1263 begin
1264 Ent := XE.Ent;
1265 Ctyp := Xref_Entity_Letters (Ekind (Ent));
1266
1267 -- Skip reference if it is the only reference to an entity,
1268 -- and it is an end-line reference, and the entity is not in
1269 -- the current extended source. This prevents junk entries
1270 -- consisting only of packages with end lines, where no
1271 -- entity from the package is actually referenced.
1272
1273 if XE.Typ = 'e'
1274 and then Ent /= Curent
1275 and then (Refno = Nrefs or else
1276 Ent /= Xrefs.Table (Rnums (Refno + 1)).Ent)
1277 and then
1278 not In_Extended_Main_Source_Unit (Ent)
1279 then
1280 goto Continue;
1281 end if;
1282
1283 -- For private type, get full view type
1284
1285 if Ctyp = '+'
1286 and then Present (Full_View (XE.Ent))
1287 then
1288 Ent := Underlying_Type (Ent);
1289
1290 if Present (Ent) then
1291 Ctyp := Xref_Entity_Letters (Ekind (Ent));
1292 end if;
1293 end if;
1294
1295 -- Special exception for Boolean
1296
1297 if Ctyp = 'E' and then Is_Boolean_Type (Ent) then
1298 Ctyp := 'B';
1299 end if;
1300
1301 -- For variable reference, get corresponding type
1302
1303 if Ctyp = '*' then
1304 Ent := Etype (XE.Ent);
1305 Ctyp := Fold_Lower (Xref_Entity_Letters (Ekind (Ent)));
1306
1307 -- If variable is private type, get full view type
1308
1309 if Ctyp = '+'
1310 and then Present (Full_View (Etype (XE.Ent)))
1311 then
1312 Ent := Underlying_Type (Etype (XE.Ent));
1313
1314 if Present (Ent) then
1315 Ctyp := Fold_Lower (Xref_Entity_Letters (Ekind (Ent)));
1316 end if;
1317
1318 elsif Is_Generic_Type (Ent) then
1319
1320 -- If the type of the entity is a generic private type
1321 -- there is no usable full view, so retain the indication
1322 -- that this is an object.
1323
1324 Ctyp := '*';
1325 end if;
1326
1327 -- Special handling for access parameter
1328
1329 declare
1330 K : constant Entity_Kind := Ekind (Etype (XE.Ent));
1331
1332 begin
1333 if (K = E_Anonymous_Access_Type
1334 or else
1335 K = E_Anonymous_Access_Subprogram_Type
1336 or else K =
1337 E_Anonymous_Access_Protected_Subprogram_Type)
1338 and then Is_Formal (XE.Ent)
1339 then
1340 Ctyp := 'p';
1341
1342 -- Special handling for Boolean
1343
1344 elsif Ctyp = 'e' and then Is_Boolean_Type (Ent) then
1345 Ctyp := 'b';
1346 end if;
1347 end;
1348 end if;
1349
1350 -- Special handling for abstract types and operations
1351
1352 if Is_Abstract (XE.Ent) then
1353
1354 if Ctyp = 'U' then
1355 Ctyp := 'x'; -- abstract procedure
1356
1357 elsif Ctyp = 'V' then
1358 Ctyp := 'y'; -- abstract function
1359
1360 elsif Ctyp = 'R' then
1361 Ctyp := 'H'; -- abstract type
1362 end if;
1363 end if;
1364
1365 -- Only output reference if interesting type of entity,
1366 -- and suppress self references, except for bodies that
1367 -- act as specs. Also suppress definitions of body formals
1368 -- (we only treat these as references, and the references
1369 -- were separately recorded).
1370
1371 if Ctyp = ' '
1372 or else (XE.Loc = XE.Def
1373 and then
1374 (XE.Typ /= 'b'
1375 or else not Is_Subprogram (XE.Ent)))
1376 or else (Is_Formal (XE.Ent)
1377 and then Present (Spec_Entity (XE.Ent)))
1378 then
1379 null;
1380
1381 else
1382 -- Start new Xref section if new xref unit
1383
1384 if XE.Eun /= Curxu then
1385 if Write_Info_Col > 1 then
1386 Write_Info_EOL;
1387 end if;
1388
1389 Curxu := XE.Eun;
1390 Cursrc := Source_Text (Source_Index (Curxu));
1391
1392 Write_Info_Initiate ('X');
1393 Write_Info_Char (' ');
1394 Write_Info_Nat (Dependency_Num (XE.Eun));
1395 Write_Info_Char (' ');
1396 Write_Info_Name (Reference_Name (Source_Index (XE.Eun)));
1397 end if;
1398
1399 -- Start new Entity line if new entity. Note that we
1400 -- consider two entities the same if they have the same
1401 -- name and source location. This causes entities in
1402 -- instantiations to be treated as though they referred
1403 -- to the template.
1404
1405 if No (Curent)
1406 or else
1407 (XE.Ent /= Curent
1408 and then
1409 (Name_Change (XE.Ent) or else XE.Def /= Curdef))
1410 then
1411 Curent := XE.Ent;
1412 Curdef := XE.Def;
1413
1414 Get_Unqualified_Name_String (Chars (XE.Ent));
1415 Curlen := Name_Len;
1416 Curnam (1 .. Curlen) := Name_Buffer (1 .. Curlen);
1417
1418 if Write_Info_Col > 1 then
1419 Write_Info_EOL;
1420 end if;
1421
1422 -- Write column number information
1423
1424 Write_Info_Nat (Int (Get_Logical_Line_Number (XE.Def)));
1425 Write_Info_Char (Ctyp);
1426 Write_Info_Nat (Int (Get_Column_Number (XE.Def)));
1427
1428 -- Write level information
1429
1430 Write_Level_Info : declare
1431 function Is_Visible_Generic_Entity
1432 (E : Entity_Id) return Boolean;
1433 -- Check whether E is declared in the visible part
1434 -- of a generic package. For source navigation
1435 -- purposes, treat this as a visible entity.
1436
1437 function Is_Private_Record_Component
1438 (E : Entity_Id) return Boolean;
1439 -- Check whether E is a non-inherited component of a
1440 -- private extension. Even if the enclosing record is
1441 -- public, we want to treat the component as private
1442 -- for navigation purposes.
1443
1444 ---------------------------------
1445 -- Is_Private_Record_Component --
1446 ---------------------------------
1447
1448 function Is_Private_Record_Component
1449 (E : Entity_Id) return Boolean
1450 is
1451 S : constant Entity_Id := Scope (E);
1452 begin
1453 return
1454 Ekind (E) = E_Component
1455 and then Nkind (Declaration_Node (S)) =
1456 N_Private_Extension_Declaration
1457 and then Original_Record_Component (E) = E;
1458 end Is_Private_Record_Component;
1459
1460 -------------------------------
1461 -- Is_Visible_Generic_Entity --
1462 -------------------------------
1463
1464 function Is_Visible_Generic_Entity
1465 (E : Entity_Id) return Boolean
1466 is
1467 Par : Node_Id;
1468
1469 begin
1470 if Ekind (Scope (E)) /= E_Generic_Package then
1471 return False;
1472 end if;
1473
1474 Par := Parent (E);
1475 while Present (Par) loop
1476 if
1477 Nkind (Par) = N_Generic_Package_Declaration
1478 then
1479 -- Entity is a generic formal
1480
1481 return False;
1482
1483 elsif
1484 Nkind (Parent (Par)) = N_Package_Specification
1485 then
1486 return
1487 Is_List_Member (Par)
1488 and then List_Containing (Par) =
1489 Visible_Declarations (Parent (Par));
1490 else
1491 Par := Parent (Par);
1492 end if;
1493 end loop;
1494
1495 return False;
1496 end Is_Visible_Generic_Entity;
1497
1498 -- Start of processing for Write_Level_Info
1499
1500 begin
1501 if Is_Hidden (Curent)
1502 or else Is_Private_Record_Component (Curent)
1503 then
1504 Write_Info_Char (' ');
1505
1506 elsif
1507 Is_Public (Curent)
1508 or else Is_Visible_Generic_Entity (Curent)
1509 then
1510 Write_Info_Char ('*');
1511
1512 else
1513 Write_Info_Char (' ');
1514 end if;
1515 end Write_Level_Info;
1516
1517 -- Output entity name. We use the occurrence from the
1518 -- actual source program at the definition point
1519
1520 P := Original_Location (Sloc (XE.Ent));
1521
1522 -- Entity is character literal
1523
1524 if Cursrc (P) = ''' then
1525 Write_Info_Char (Cursrc (P));
1526 Write_Info_Char (Cursrc (P + 1));
1527 Write_Info_Char (Cursrc (P + 2));
1528
1529 -- Entity is operator symbol
1530
1531 elsif Cursrc (P) = '"' or else Cursrc (P) = '%' then
1532 Write_Info_Char (Cursrc (P));
1533
1534 P2 := P;
1535 loop
1536 P2 := P2 + 1;
1537 Write_Info_Char (Cursrc (P2));
1538 exit when Cursrc (P2) = Cursrc (P);
1539 end loop;
1540
1541 -- Entity is identifier
1542
1543 else
1544 loop
1545 if Is_Start_Of_Wide_Char (Cursrc, P) then
1546 Scan_Wide (Cursrc, P, WC, Err);
1547 elsif not Identifier_Char (Cursrc (P)) then
1548 exit;
1549 else
1550 P := P + 1;
1551 end if;
1552 end loop;
1553
1554 for J in
1555 Original_Location (Sloc (XE.Ent)) .. P - 1
1556 loop
1557 Write_Info_Char (Cursrc (J));
1558 end loop;
1559 end if;
1560
1561 -- See if we have a renaming reference
1562
1563 if Is_Object (XE.Ent)
1564 and then Present (Renamed_Object (XE.Ent))
1565 then
1566 Rref := Renamed_Object (XE.Ent);
1567
1568 elsif Is_Overloadable (XE.Ent)
1569 and then Nkind (Parent (Declaration_Node (XE.Ent))) =
1570 N_Subprogram_Renaming_Declaration
1571 then
1572 Rref := Name (Parent (Declaration_Node (XE.Ent)));
1573
1574 elsif Ekind (XE.Ent) = E_Package
1575 and then Nkind (Declaration_Node (XE.Ent)) =
1576 N_Package_Renaming_Declaration
1577 then
1578 Rref := Name (Declaration_Node (XE.Ent));
1579
1580 else
1581 Rref := Empty;
1582 end if;
1583
1584 if Present (Rref) then
1585 if Nkind (Rref) = N_Expanded_Name then
1586 Rref := Selector_Name (Rref);
1587 end if;
1588
1589 if Nkind (Rref) = N_Identifier
1590 or else Nkind (Rref) = N_Operator_Symbol
1591 then
1592 null;
1593
1594 -- For renamed array components, use the array name
1595 -- for the renamed entity, which reflect the fact that
1596 -- in general the whole array is aliased.
1597
1598 elsif Nkind (Rref) = N_Indexed_Component then
1599 if Nkind (Prefix (Rref)) = N_Identifier then
1600 Rref := Prefix (Rref);
1601 elsif Nkind (Prefix (Rref)) = N_Expanded_Name then
1602 Rref := Selector_Name (Prefix (Rref));
1603 else
1604 Rref := Empty;
1605 end if;
1606
1607 else
1608 Rref := Empty;
1609 end if;
1610 end if;
1611
1612 -- Write out renaming reference if we have one
1613
1614 if Present (Rref) then
1615 Write_Info_Char ('=');
1616 Write_Info_Nat
1617 (Int (Get_Logical_Line_Number (Sloc (Rref))));
1618 Write_Info_Char (':');
1619 Write_Info_Nat
1620 (Int (Get_Column_Number (Sloc (Rref))));
1621 end if;
1622
1623 -- Indicate that the entity is in the unit
1624 -- of the current xref xection.
1625
1626 Curru := Curxu;
1627
1628 -- Write out information about generic parent,
1629 -- if entity is an instance.
1630
1631 if Is_Generic_Instance (XE.Ent) then
1632 declare
1633 Gen_Par : constant Entity_Id :=
1634 Generic_Parent
1635 (Specification
1636 (Unit_Declaration_Node (XE.Ent)));
1637 Loc : constant Source_Ptr := Sloc (Gen_Par);
1638 Gen_U : constant Unit_Number_Type :=
1639 Get_Source_Unit (Loc);
1640 begin
1641 Write_Info_Char ('[');
1642 if Curru /= Gen_U then
1643 Write_Info_Nat (Dependency_Num (Gen_U));
1644 Write_Info_Char ('|');
1645 end if;
1646
1647 Write_Info_Nat
1648 (Int (Get_Logical_Line_Number (Loc)));
1649 Write_Info_Char (']');
1650 end;
1651 end if;
1652
1653 -- See if we have a type reference and if so output
1654
1655 Get_Type_Reference (XE.Ent, Tref, Left, Right);
1656
1657 if Present (Tref) then
1658
1659 -- Case of standard entity, output name
1660
1661 if Sloc (Tref) = Standard_Location then
1662 Write_Info_Char (Left);
1663 Write_Info_Name (Chars (Tref));
1664 Write_Info_Char (Right);
1665
1666 -- Case of source entity, output location
1667
1668 else
1669 Write_Info_Char (Left);
1670 Trunit := Get_Source_Unit (Sloc (Tref));
1671
1672 if Trunit /= Curxu then
1673 Write_Info_Nat (Dependency_Num (Trunit));
1674 Write_Info_Char ('|');
1675 end if;
1676
1677 Write_Info_Nat
1678 (Int (Get_Logical_Line_Number (Sloc (Tref))));
1679
1680 declare
1681 Ent : Entity_Id := Tref;
1682 Kind : constant Entity_Kind := Ekind (Ent);
1683 Ctyp : Character := Xref_Entity_Letters (Kind);
1684
1685 begin
1686 if Ctyp = '+'
1687 and then Present (Full_View (Ent))
1688 then
1689 Ent := Underlying_Type (Ent);
1690
1691 if Present (Ent) then
1692 Ctyp := Xref_Entity_Letters (Ekind (Ent));
1693 end if;
1694 end if;
1695
1696 Write_Info_Char (Ctyp);
1697 end;
1698
1699 Write_Info_Nat
1700 (Int (Get_Column_Number (Sloc (Tref))));
1701
1702 -- If the type comes from an instantiation,
1703 -- add the corresponding info.
1704
1705 Output_Instantiation_Refs (Sloc (Tref));
1706 Write_Info_Char (Right);
1707 end if;
1708 end if;
1709
1710 -- If the entity is an overriding operation, write
1711 -- info on operation that was overridden.
1712
1713 if Is_Subprogram (XE.Ent)
1714 and then Is_Overriding_Operation (XE.Ent)
1715 then
1716 Output_Overridden_Op (Overridden_Operation (XE.Ent));
1717 end if;
1718
1719 -- End of processing for entity output
1720
1721 Crloc := No_Location;
1722 end if;
1723
1724 -- Output the reference
1725
1726 if XE.Loc /= No_Location
1727 and then XE.Loc /= Crloc
1728 then
1729 Crloc := XE.Loc;
1730
1731 -- Start continuation if line full, else blank
1732
1733 if Write_Info_Col > 72 then
1734 Write_Info_EOL;
1735 Write_Info_Initiate ('.');
1736 end if;
1737
1738 Write_Info_Char (' ');
1739
1740 -- Output file number if changed
1741
1742 if XE.Lun /= Curru then
1743 Curru := XE.Lun;
1744 Write_Info_Nat (Dependency_Num (Curru));
1745 Write_Info_Char ('|');
1746 end if;
1747
1748 Write_Info_Nat (Int (Get_Logical_Line_Number (XE.Loc)));
1749 Write_Info_Char (XE.Typ);
1750
1751 if Is_Overloadable (XE.Ent)
1752 and then Is_Imported (XE.Ent)
1753 and then XE.Typ = 'b'
1754 then
1755 Output_Import_Export_Info (XE.Ent);
1756 end if;
1757
1758 Write_Info_Nat (Int (Get_Column_Number (XE.Loc)));
1759
1760 Output_Instantiation_Refs (Sloc (XE.Ent));
1761 end if;
1762 end if;
1763 end Output_One_Ref;
1764
1765 <<Continue>>
1766 null;
1767 end loop;
1768
1769 Write_Info_EOL;
1770 end Output_Refs;
1771 end Output_References;
1772
1773 end Lib.Xref;
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