summaryrefslogtreecommitdiff
path: root/gdb/expprint.c
blob: ed9d50ddf54b268d5337101598619ab748330a43 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
/* Print in infix form a struct expression.
   Copyright 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
   1998, 1999, 2000 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "value.h"
#include "language.h"
#include "parser-defs.h"
#include "frame.h"		/* For frame_map_regnum_to_name.  */
#include "target.h"
#include "gdb_string.h"

#ifdef HAVE_CTYPE_H
#include <ctype.h>
#endif

/* Prototypes for local functions */

static void print_subexp (struct expression *, int *, struct ui_file *,
			  enum precedence);

void
print_expression (struct expression *exp, struct ui_file *stream)
{
  int pc = 0;
  print_subexp (exp, &pc, stream, PREC_NULL);
}

/* Print the subexpression of EXP that starts in position POS, on STREAM.
   PREC is the precedence of the surrounding operator;
   if the precedence of the main operator of this subexpression is less,
   parentheses are needed here.  */

static void
print_subexp (register struct expression *exp, register int *pos,
	      struct ui_file *stream, enum precedence prec)
{
  register unsigned tem;
  register const struct op_print *op_print_tab;
  register int pc;
  unsigned nargs;
  register char *op_str;
  int assign_modify = 0;
  enum exp_opcode opcode;
  enum precedence myprec = PREC_NULL;
  /* Set to 1 for a right-associative operator.  */
  int assoc = 0;
  struct value *val;
  char *tempstr = NULL;

  op_print_tab = exp->language_defn->la_op_print_tab;
  pc = (*pos)++;
  opcode = exp->elts[pc].opcode;
  switch (opcode)
    {
      /* Common ops */

    case OP_SCOPE:
      myprec = PREC_PREFIX;
      assoc = 0;
      fputs_filtered (type_name_no_tag (exp->elts[pc + 1].type), stream);
      fputs_filtered ("::", stream);
      nargs = longest_to_int (exp->elts[pc + 2].longconst);
      (*pos) += 4 + BYTES_TO_EXP_ELEM (nargs + 1);
      fputs_filtered (&exp->elts[pc + 3].string, stream);
      return;

    case OP_LONG:
      (*pos) += 3;
      value_print (value_from_longest (exp->elts[pc + 1].type,
				       exp->elts[pc + 2].longconst),
		   stream, 0, Val_no_prettyprint);
      return;

    case OP_DOUBLE:
      (*pos) += 3;
      value_print (value_from_double (exp->elts[pc + 1].type,
				      exp->elts[pc + 2].doubleconst),
		   stream, 0, Val_no_prettyprint);
      return;

    case OP_VAR_VALUE:
      {
	struct block *b;
	(*pos) += 3;
	b = exp->elts[pc + 1].block;
	if (b != NULL
	    && BLOCK_FUNCTION (b) != NULL
	    && SYMBOL_SOURCE_NAME (BLOCK_FUNCTION (b)) != NULL)
	  {
	    fputs_filtered (SYMBOL_SOURCE_NAME (BLOCK_FUNCTION (b)), stream);
	    fputs_filtered ("::", stream);
	  }
	fputs_filtered (SYMBOL_SOURCE_NAME (exp->elts[pc + 2].symbol), stream);
      }
      return;

    case OP_LAST:
      (*pos) += 2;
      fprintf_filtered (stream, "$%d",
			longest_to_int (exp->elts[pc + 1].longconst));
      return;

    case OP_REGISTER:
      {
	int regnum = longest_to_int (exp->elts[pc + 1].longconst);
	(*pos) += 2;
	fprintf_filtered (stream, "$%s", frame_map_regnum_to_name (regnum));
	return;
      }

    case OP_BOOL:
      (*pos) += 2;
      fprintf_filtered (stream, "%s",
			longest_to_int (exp->elts[pc + 1].longconst)
			? "TRUE" : "FALSE");
      return;

    case OP_INTERNALVAR:
      (*pos) += 2;
      fprintf_filtered (stream, "$%s",
			internalvar_name (exp->elts[pc + 1].internalvar));
      return;

    case OP_FUNCALL:
      (*pos) += 2;
      nargs = longest_to_int (exp->elts[pc + 1].longconst);
      print_subexp (exp, pos, stream, PREC_SUFFIX);
      fputs_filtered (" (", stream);
      for (tem = 0; tem < nargs; tem++)
	{
	  if (tem != 0)
	    fputs_filtered (", ", stream);
	  print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
	}
      fputs_filtered (")", stream);
      return;

    case OP_NAME:
    case OP_EXPRSTRING:
      nargs = longest_to_int (exp->elts[pc + 1].longconst);
      (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
      fputs_filtered (&exp->elts[pc + 2].string, stream);
      return;

    case OP_STRING:
      nargs = longest_to_int (exp->elts[pc + 1].longconst);
      (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
      /* LA_PRINT_STRING will print using the current repeat count threshold.
         If necessary, we can temporarily set it to zero, or pass it as an
         additional parameter to LA_PRINT_STRING.  -fnf */
      LA_PRINT_STRING (stream, &exp->elts[pc + 2].string, nargs, 1, 0);
      return;

    case OP_BITSTRING:
      nargs = longest_to_int (exp->elts[pc + 1].longconst);
      (*pos)
	+= 3 + BYTES_TO_EXP_ELEM ((nargs + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT);
      fprintf_unfiltered (stream, "B'<unimplemented>'");
      return;

    case OP_OBJC_NSSTRING:	/* Objective-C Foundation Class NSString constant.  */
      nargs = longest_to_int (exp->elts[pc + 1].longconst);
      (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
      fputs_filtered ("@\"", stream);
      LA_PRINT_STRING (stream, &exp->elts[pc + 2].string, nargs, 1, 0);
      fputs_filtered ("\"", stream);
      return;

    case OP_OBJC_MSGCALL:
      {			/* Objective C message (method) call.  */
	char *selector;
	(*pos) += 3;
	nargs = longest_to_int (exp->elts[pc + 2].longconst);
	fprintf_unfiltered (stream, "[");
	print_subexp (exp, pos, stream, PREC_SUFFIX);
	if (0 == target_read_string (exp->elts[pc + 1].longconst,
				     &selector, 1024, NULL))
	  {
	    error ("bad selector");
	    return;
	  }
	if (nargs)
	  {
	    char *s, *nextS;
	    s = alloca (strlen (selector) + 1);
	    strcpy (s, selector);
	    for (tem = 0; tem < nargs; tem++)
	      {
		nextS = strchr (s, ':');
		*nextS = '\0';
		fprintf_unfiltered (stream, " %s: ", s);
		s = nextS + 1;
		print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
	      }
	  }
	else
	  {
	    fprintf_unfiltered (stream, " %s", selector);
	  }
	fprintf_unfiltered (stream, "]");
	/* "selector" was malloc'd by target_read_string. Free it.  */
	free (selector);
	return;
      }

    case OP_ARRAY:
      (*pos) += 3;
      nargs = longest_to_int (exp->elts[pc + 2].longconst);
      nargs -= longest_to_int (exp->elts[pc + 1].longconst);
      nargs++;
      tem = 0;
      if (exp->elts[pc + 4].opcode == OP_LONG
	  && exp->elts[pc + 5].type == builtin_type_char
	  && exp->language_defn->la_language == language_c)
	{
	  /* Attempt to print C character arrays using string syntax.
	     Walk through the args, picking up one character from each
	     of the OP_LONG expression elements.  If any array element
	     does not match our expection of what we should find for
	     a simple string, revert back to array printing.  Note that
	     the last expression element is an explicit null terminator
	     byte, which doesn't get printed. */
	  tempstr = alloca (nargs);
	  pc += 4;
	  while (tem < nargs)
	    {
	      if (exp->elts[pc].opcode != OP_LONG
		  || exp->elts[pc + 1].type != builtin_type_char)
		{
		  /* Not a simple array of char, use regular array printing. */
		  tem = 0;
		  break;
		}
	      else
		{
		  tempstr[tem++] =
		    longest_to_int (exp->elts[pc + 2].longconst);
		  pc += 4;
		}
	    }
	}
      if (tem > 0)
	{
	  LA_PRINT_STRING (stream, tempstr, nargs - 1, 1, 0);
	  (*pos) = pc;
	}
      else
	{
	  /* OBSOLETE int is_chill = exp->language_defn->la_language == language_chill; */
	  /* OBSOLETE fputs_filtered (is_chill ? " [" : " {", stream); */
	  fputs_filtered (" {", stream);
	  for (tem = 0; tem < nargs; tem++)
	    {
	      if (tem != 0)
		{
		  fputs_filtered (", ", stream);
		}
	      print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
	    }
	  /* OBSOLETE fputs_filtered (is_chill ? "]" : "}", stream); */
	  fputs_filtered ("}", stream);
	}
      return;

    case OP_LABELED:
      tem = longest_to_int (exp->elts[pc + 1].longconst);
      (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);

#if 0
      if (0 /* OBSOLETE exp->language_defn->la_language == language_chill */)
	{ /* OBSOLETE */
	  fputs_filtered (".", stream); /* OBSOLETE */
	  fputs_filtered (&exp->elts[pc + 2].string, stream); /* OBSOLETE */
	  fputs_filtered (exp->elts[*pos].opcode == OP_LABELED ? ", " /* OBSOLETE */
			  : ": ", /* OBSOLETE */
			  stream); /* OBSOLETE */
	} /* OBSOLETE */
      else /* OBSOLETE */
#endif
	{
	  /* Gcc support both these syntaxes.  Unsure which is preferred.  */
#if 1
	  fputs_filtered (&exp->elts[pc + 2].string, stream);
	  fputs_filtered (": ", stream);
#else
	  fputs_filtered (".", stream);
	  fputs_filtered (&exp->elts[pc + 2].string, stream);
	  fputs_filtered ("=", stream);
#endif
	}
      print_subexp (exp, pos, stream, PREC_SUFFIX);
      return;

    case TERNOP_COND:
      if ((int) prec > (int) PREC_COMMA)
	fputs_filtered ("(", stream);
      /* Print the subexpressions, forcing parentheses
         around any binary operations within them.
         This is more parentheses than are strictly necessary,
         but it looks clearer.  */
      print_subexp (exp, pos, stream, PREC_HYPER);
      fputs_filtered (" ? ", stream);
      print_subexp (exp, pos, stream, PREC_HYPER);
      fputs_filtered (" : ", stream);
      print_subexp (exp, pos, stream, PREC_HYPER);
      if ((int) prec > (int) PREC_COMMA)
	fputs_filtered (")", stream);
      return;

    case TERNOP_SLICE:
    case TERNOP_SLICE_COUNT:
      print_subexp (exp, pos, stream, PREC_SUFFIX);
      fputs_filtered ("(", stream);
      print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
      fputs_filtered (opcode == TERNOP_SLICE ? " : " : " UP ", stream);
      print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
      fputs_filtered (")", stream);
      return;

    case STRUCTOP_STRUCT:
      tem = longest_to_int (exp->elts[pc + 1].longconst);
      (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
      print_subexp (exp, pos, stream, PREC_SUFFIX);
      fputs_filtered (".", stream);
      fputs_filtered (&exp->elts[pc + 2].string, stream);
      return;

      /* Will not occur for Modula-2 */
    case STRUCTOP_PTR:
      tem = longest_to_int (exp->elts[pc + 1].longconst);
      (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
      print_subexp (exp, pos, stream, PREC_SUFFIX);
      fputs_filtered ("->", stream);
      fputs_filtered (&exp->elts[pc + 2].string, stream);
      return;

    case BINOP_SUBSCRIPT:
      print_subexp (exp, pos, stream, PREC_SUFFIX);
      fputs_filtered ("[", stream);
      print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
      fputs_filtered ("]", stream);
      return;

    case UNOP_POSTINCREMENT:
      print_subexp (exp, pos, stream, PREC_SUFFIX);
      fputs_filtered ("++", stream);
      return;

    case UNOP_POSTDECREMENT:
      print_subexp (exp, pos, stream, PREC_SUFFIX);
      fputs_filtered ("--", stream);
      return;

    case UNOP_CAST:
      (*pos) += 2;
      if ((int) prec > (int) PREC_PREFIX)
	fputs_filtered ("(", stream);
      fputs_filtered ("(", stream);
      type_print (exp->elts[pc + 1].type, "", stream, 0);
      fputs_filtered (") ", stream);
      print_subexp (exp, pos, stream, PREC_PREFIX);
      if ((int) prec > (int) PREC_PREFIX)
	fputs_filtered (")", stream);
      return;

    case UNOP_MEMVAL:
      (*pos) += 2;
      if ((int) prec > (int) PREC_PREFIX)
	fputs_filtered ("(", stream);
      if (TYPE_CODE (exp->elts[pc + 1].type) == TYPE_CODE_FUNC &&
	  exp->elts[pc + 3].opcode == OP_LONG)
	{
	  /* We have a minimal symbol fn, probably.  It's encoded
	     as a UNOP_MEMVAL (function-type) of an OP_LONG (int, address).
	     Swallow the OP_LONG (including both its opcodes); ignore
	     its type; print the value in the type of the MEMVAL.  */
	  (*pos) += 4;
	  val = value_at_lazy (exp->elts[pc + 1].type,
			       (CORE_ADDR) exp->elts[pc + 5].longconst,
			       NULL);
	  value_print (val, stream, 0, Val_no_prettyprint);
	}
      else
	{
	  fputs_filtered ("{", stream);
	  type_print (exp->elts[pc + 1].type, "", stream, 0);
	  fputs_filtered ("} ", stream);
	  print_subexp (exp, pos, stream, PREC_PREFIX);
	}
      if ((int) prec > (int) PREC_PREFIX)
	fputs_filtered (")", stream);
      return;

    case BINOP_ASSIGN_MODIFY:
      opcode = exp->elts[pc + 1].opcode;
      (*pos) += 2;
      myprec = PREC_ASSIGN;
      assoc = 1;
      assign_modify = 1;
      op_str = "???";
      for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
	if (op_print_tab[tem].opcode == opcode)
	  {
	    op_str = op_print_tab[tem].string;
	    break;
	  }
      if (op_print_tab[tem].opcode != opcode)
	/* Not found; don't try to keep going because we don't know how
	   to interpret further elements.  */
	error ("Invalid expression");
      break;

      /* C++ ops */

    case OP_THIS:
      ++(*pos);
      fputs_filtered ("this", stream);
      return;

      /* Objective-C ops */

    case OP_OBJC_SELF:
      ++(*pos);
      fputs_filtered ("self", stream);	/* The ObjC equivalent of "this".  */
      return;

      /* Modula-2 ops */

    case MULTI_SUBSCRIPT:
      (*pos) += 2;
      nargs = longest_to_int (exp->elts[pc + 1].longconst);
      print_subexp (exp, pos, stream, PREC_SUFFIX);
      fprintf_unfiltered (stream, " [");
      for (tem = 0; tem < nargs; tem++)
	{
	  if (tem != 0)
	    fprintf_unfiltered (stream, ", ");
	  print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
	}
      fprintf_unfiltered (stream, "]");
      return;

    case BINOP_VAL:
      (*pos) += 2;
      fprintf_unfiltered (stream, "VAL(");
      type_print (exp->elts[pc + 1].type, "", stream, 0);
      fprintf_unfiltered (stream, ",");
      print_subexp (exp, pos, stream, PREC_PREFIX);
      fprintf_unfiltered (stream, ")");
      return;

    case BINOP_INCL:
    case BINOP_EXCL:
      error ("print_subexp:  Not implemented.");

      /* Default ops */

    default:
      op_str = "???";
      for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
	if (op_print_tab[tem].opcode == opcode)
	  {
	    op_str = op_print_tab[tem].string;
	    myprec = op_print_tab[tem].precedence;
	    assoc = op_print_tab[tem].right_assoc;
	    break;
	  }
      if (op_print_tab[tem].opcode != opcode)
	/* Not found; don't try to keep going because we don't know how
	   to interpret further elements.  For example, this happens
	   if opcode is OP_TYPE.  */
	error ("Invalid expression");
    }

  /* Note that PREC_BUILTIN will always emit parentheses. */
  if ((int) myprec < (int) prec)
    fputs_filtered ("(", stream);
  if ((int) opcode > (int) BINOP_END)
    {
      if (assoc)
	{
	  /* Unary postfix operator.  */
	  print_subexp (exp, pos, stream, PREC_SUFFIX);
	  fputs_filtered (op_str, stream);
	}
      else
	{
	  /* Unary prefix operator.  */
	  fputs_filtered (op_str, stream);
	  if (myprec == PREC_BUILTIN_FUNCTION)
	    fputs_filtered ("(", stream);
	  print_subexp (exp, pos, stream, PREC_PREFIX);
	  if (myprec == PREC_BUILTIN_FUNCTION)
	    fputs_filtered (")", stream);
	}
    }
  else
    {
      /* Binary operator.  */
      /* Print left operand.
         If operator is right-associative,
         increment precedence for this operand.  */
      print_subexp (exp, pos, stream,
		    (enum precedence) ((int) myprec + assoc));
      /* Print the operator itself.  */
      if (assign_modify)
	fprintf_filtered (stream, " %s= ", op_str);
      else if (op_str[0] == ',')
	fprintf_filtered (stream, "%s ", op_str);
      else
	fprintf_filtered (stream, " %s ", op_str);
      /* Print right operand.
         If operator is left-associative,
         increment precedence for this operand.  */
      print_subexp (exp, pos, stream,
		    (enum precedence) ((int) myprec + !assoc));
    }

  if ((int) myprec < (int) prec)
    fputs_filtered (")", stream);
}

/* Return the operator corresponding to opcode OP as
   a string.   NULL indicates that the opcode was not found in the
   current language table.  */
char *
op_string (enum exp_opcode op)
{
  int tem;
  register const struct op_print *op_print_tab;

  op_print_tab = current_language->la_op_print_tab;
  for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
    if (op_print_tab[tem].opcode == op)
      return op_print_tab[tem].string;
  return NULL;
}

/* Support for dumping the raw data from expressions in a human readable
   form.  */

static char *op_name (int opcode);

static char *
op_name (int opcode)
{
  switch (opcode)
    {
    default:
      {
	static char buf[30];

	sprintf (buf, "<unknown %d>", opcode);
	return buf;
      }
    case OP_NULL:
      return "OP_NULL";
    case BINOP_ADD:
      return "BINOP_ADD";
    case BINOP_SUB:
      return "BINOP_SUB";
    case BINOP_MUL:
      return "BINOP_MUL";
    case BINOP_DIV:
      return "BINOP_DIV";
    case BINOP_REM:
      return "BINOP_REM";
    case BINOP_MOD:
      return "BINOP_MOD";
    case BINOP_LSH:
      return "BINOP_LSH";
    case BINOP_RSH:
      return "BINOP_RSH";
    case BINOP_LOGICAL_AND:
      return "BINOP_LOGICAL_AND";
    case BINOP_LOGICAL_OR:
      return "BINOP_LOGICAL_OR";
    case BINOP_BITWISE_AND:
      return "BINOP_BITWISE_AND";
    case BINOP_BITWISE_IOR:
      return "BINOP_BITWISE_IOR";
    case BINOP_BITWISE_XOR:
      return "BINOP_BITWISE_XOR";
    case BINOP_EQUAL:
      return "BINOP_EQUAL";
    case BINOP_NOTEQUAL:
      return "BINOP_NOTEQUAL";
    case BINOP_LESS:
      return "BINOP_LESS";
    case BINOP_GTR:
      return "BINOP_GTR";
    case BINOP_LEQ:
      return "BINOP_LEQ";
    case BINOP_GEQ:
      return "BINOP_GEQ";
    case BINOP_REPEAT:
      return "BINOP_REPEAT";
    case BINOP_ASSIGN:
      return "BINOP_ASSIGN";
    case BINOP_COMMA:
      return "BINOP_COMMA";
    case BINOP_SUBSCRIPT:
      return "BINOP_SUBSCRIPT";
    case MULTI_SUBSCRIPT:
      return "MULTI_SUBSCRIPT";
    case BINOP_EXP:
      return "BINOP_EXP";
    case BINOP_MIN:
      return "BINOP_MIN";
    case BINOP_MAX:
      return "BINOP_MAX";
    case STRUCTOP_MEMBER:
      return "STRUCTOP_MEMBER";
    case STRUCTOP_MPTR:
      return "STRUCTOP_MPTR";
    case BINOP_INTDIV:
      return "BINOP_INTDIV";
    case BINOP_ASSIGN_MODIFY:
      return "BINOP_ASSIGN_MODIFY";
    case BINOP_VAL:
      return "BINOP_VAL";
    case BINOP_INCL:
      return "BINOP_INCL";
    case BINOP_EXCL:
      return "BINOP_EXCL";
    case BINOP_CONCAT:
      return "BINOP_CONCAT";
    case BINOP_RANGE:
      return "BINOP_RANGE";
    case BINOP_END:
      return "BINOP_END";
    case TERNOP_COND:
      return "TERNOP_COND";
    case TERNOP_SLICE:
      return "TERNOP_SLICE";
    case TERNOP_SLICE_COUNT:
      return "TERNOP_SLICE_COUNT";
    case OP_LONG:
      return "OP_LONG";
    case OP_DOUBLE:
      return "OP_DOUBLE";
    case OP_VAR_VALUE:
      return "OP_VAR_VALUE";
    case OP_LAST:
      return "OP_LAST";
    case OP_REGISTER:
      return "OP_REGISTER";
    case OP_INTERNALVAR:
      return "OP_INTERNALVAR";
    case OP_FUNCALL:
      return "OP_FUNCALL";
    case OP_STRING:
      return "OP_STRING";
    case OP_BITSTRING:
      return "OP_BITSTRING";
    case OP_ARRAY:
      return "OP_ARRAY";
    case UNOP_CAST:
      return "UNOP_CAST";
    case UNOP_MEMVAL:
      return "UNOP_MEMVAL";
    case UNOP_NEG:
      return "UNOP_NEG";
    case UNOP_LOGICAL_NOT:
      return "UNOP_LOGICAL_NOT";
    case UNOP_COMPLEMENT:
      return "UNOP_COMPLEMENT";
    case UNOP_IND:
      return "UNOP_IND";
    case UNOP_ADDR:
      return "UNOP_ADDR";
    case UNOP_PREINCREMENT:
      return "UNOP_PREINCREMENT";
    case UNOP_POSTINCREMENT:
      return "UNOP_POSTINCREMENT";
    case UNOP_PREDECREMENT:
      return "UNOP_PREDECREMENT";
    case UNOP_POSTDECREMENT:
      return "UNOP_POSTDECREMENT";
    case UNOP_SIZEOF:
      return "UNOP_SIZEOF";
    case UNOP_LOWER:
      return "UNOP_LOWER";
    case UNOP_UPPER:
      return "UNOP_UPPER";
    case UNOP_LENGTH:
      return "UNOP_LENGTH";
    case UNOP_PLUS:
      return "UNOP_PLUS";
    case UNOP_CAP:
      return "UNOP_CAP";
    case UNOP_CHR:
      return "UNOP_CHR";
    case UNOP_ORD:
      return "UNOP_ORD";
    case UNOP_ABS:
      return "UNOP_ABS";
    case UNOP_FLOAT:
      return "UNOP_FLOAT";
    case UNOP_HIGH:
      return "UNOP_HIGH";
    case UNOP_MAX:
      return "UNOP_MAX";
    case UNOP_MIN:
      return "UNOP_MIN";
    case UNOP_ODD:
      return "UNOP_ODD";
    case UNOP_TRUNC:
      return "UNOP_TRUNC";
    case OP_BOOL:
      return "OP_BOOL";
    case OP_M2_STRING:
      return "OP_M2_STRING";
    case STRUCTOP_STRUCT:
      return "STRUCTOP_STRUCT";
    case STRUCTOP_PTR:
      return "STRUCTOP_PTR";
    case OP_THIS:
      return "OP_THIS";
    case OP_OBJC_SELF:
      return "OP_OBJC_SELF";
    case OP_SCOPE:
      return "OP_SCOPE";
    case OP_TYPE:
      return "OP_TYPE";
    case OP_LABELED:
      return "OP_LABELED";
    }
}

void
dump_prefix_expression (struct expression *exp, struct ui_file *stream,
			char *note)
{
  int elt;
  char *opcode_name;
  char *eltscan;
  int eltsize;

  fprintf_filtered (stream, "Dump of expression @ ");
  gdb_print_host_address (exp, stream);
  fprintf_filtered (stream, ", %s:\nExpression: `", note);
  if (exp->elts[0].opcode != OP_TYPE)
    print_expression (exp, stream);
  else
    fprintf_filtered (stream, "Type printing not yet supported....");
  fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
		    exp->language_defn->la_name, exp->nelts,
		    (long) sizeof (union exp_element));
  fprintf_filtered (stream, "\t%5s  %20s  %16s  %s\n", "Index", "Opcode",
		    "Hex Value", "String Value");
  for (elt = 0; elt < exp->nelts; elt++)
    {
      fprintf_filtered (stream, "\t%5d  ", elt);
      opcode_name = op_name (exp->elts[elt].opcode);

      fprintf_filtered (stream, "%20s  ", opcode_name);
      print_longest (stream, 'd', 0, exp->elts[elt].longconst);
      fprintf_filtered (stream, "  ");

      for (eltscan = (char *) &exp->elts[elt],
	   eltsize = sizeof (union exp_element);
	   eltsize-- > 0;
	   eltscan++)
	{
	  fprintf_filtered (stream, "%c",
			    isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
	}
      fprintf_filtered (stream, "\n");
    }
}

static int dump_subexp (struct expression *exp, struct ui_file *stream,
			int elt);

static int
dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
{
  static int indent = 0;
  int i;

  fprintf_filtered (stream, "\n");
  fprintf_filtered (stream, "\t%5d  ", elt);

  for (i = 1; i <= indent; i++)
    fprintf_filtered (stream, " ");
  indent += 2;

  fprintf_filtered (stream, "%-20s  ", op_name (exp->elts[elt].opcode));

  switch (exp->elts[elt++].opcode)
    {
    case TERNOP_COND:
    case TERNOP_SLICE:
    case TERNOP_SLICE_COUNT:
      elt = dump_subexp (exp, stream, elt);
    case BINOP_ADD:
    case BINOP_SUB:
    case BINOP_MUL:
    case BINOP_DIV:
    case BINOP_REM:
    case BINOP_MOD:
    case BINOP_LSH:
    case BINOP_RSH:
    case BINOP_LOGICAL_AND:
    case BINOP_LOGICAL_OR:
    case BINOP_BITWISE_AND:
    case BINOP_BITWISE_IOR:
    case BINOP_BITWISE_XOR:
    case BINOP_EQUAL:
    case BINOP_NOTEQUAL:
    case BINOP_LESS:
    case BINOP_GTR:
    case BINOP_LEQ:
    case BINOP_GEQ:
    case BINOP_REPEAT:
    case BINOP_ASSIGN:
    case BINOP_COMMA:
    case BINOP_SUBSCRIPT:
    case BINOP_EXP:
    case BINOP_MIN:
    case BINOP_MAX:
    case BINOP_INTDIV:
    case BINOP_ASSIGN_MODIFY:
    case BINOP_VAL:
    case BINOP_INCL:
    case BINOP_EXCL:
    case BINOP_CONCAT:
    case BINOP_IN:
    case BINOP_RANGE:
    case BINOP_END:
      elt = dump_subexp (exp, stream, elt);
    case UNOP_NEG:
    case UNOP_LOGICAL_NOT:
    case UNOP_COMPLEMENT:
    case UNOP_IND:
    case UNOP_ADDR:
    case UNOP_PREINCREMENT:
    case UNOP_POSTINCREMENT:
    case UNOP_PREDECREMENT:
    case UNOP_POSTDECREMENT:
    case UNOP_SIZEOF:
    case UNOP_PLUS:
    case UNOP_CAP:
    case UNOP_CHR:
    case UNOP_ORD:
    case UNOP_ABS:
    case UNOP_FLOAT:
    case UNOP_HIGH:
    case UNOP_MAX:
    case UNOP_MIN:
    case UNOP_ODD:
    case UNOP_TRUNC:
    case UNOP_LOWER:
    case UNOP_UPPER:
    case UNOP_LENGTH:
    case UNOP_CARD:
    case UNOP_CHMAX:
    case UNOP_CHMIN:
      elt = dump_subexp (exp, stream, elt);
      break;
    case OP_LONG:
      fprintf_filtered (stream, "Type @");
      gdb_print_host_address (exp->elts[elt].type, stream);
      fprintf_filtered (stream, " (");
      type_print (exp->elts[elt].type, NULL, stream, 0);
      fprintf_filtered (stream, "), value %ld (0x%lx)",
			(long) exp->elts[elt + 1].longconst,
			(long) exp->elts[elt + 1].longconst);
      elt += 3;
      break;
    case OP_DOUBLE:
      fprintf_filtered (stream, "Type @");
      gdb_print_host_address (exp->elts[elt].type, stream);
      fprintf_filtered (stream, " (");
      type_print (exp->elts[elt].type, NULL, stream, 0);
      fprintf_filtered (stream, "), value %g",
			(double) exp->elts[elt + 1].doubleconst);
      elt += 3;
      break;
    case OP_VAR_VALUE:
      fprintf_filtered (stream, "Block @");
      gdb_print_host_address (exp->elts[elt].block, stream);
      fprintf_filtered (stream, ", symbol @");
      gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
      fprintf_filtered (stream, " (%s)",
			SYMBOL_NAME (exp->elts[elt + 1].symbol));
      elt += 3;
      break;
    case OP_LAST:
      fprintf_filtered (stream, "History element %ld",
			(long) exp->elts[elt].longconst);
      elt += 2;
      break;
    case OP_REGISTER:
      fprintf_filtered (stream, "Register %ld",
			(long) exp->elts[elt].longconst);
      elt += 2;
      break;
    case OP_INTERNALVAR:
      fprintf_filtered (stream, "Internal var @");
      gdb_print_host_address (exp->elts[elt].internalvar, stream);
      fprintf_filtered (stream, " (%s)",
			exp->elts[elt].internalvar->name);
      elt += 2;
      break;
    case OP_FUNCALL:
      {
	int nargs;

	nargs = longest_to_int (exp->elts[elt].longconst);

	fprintf_filtered (stream, "Number of args: %d", nargs);
	elt += 2;

	for (i = 1; i <= nargs + 1; i++)
	  elt = dump_subexp (exp, stream, elt);
      }
      break;
    case OP_ARRAY:
      {
	int lower, upper;
	int i;

	lower = longest_to_int (exp->elts[elt].longconst);
	upper = longest_to_int (exp->elts[elt + 1].longconst);

	fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
	elt += 3;

	for (i = 1; i <= upper - lower + 1; i++)
	  elt = dump_subexp (exp, stream, elt);
      }
      break;
    case UNOP_MEMVAL:
    case UNOP_CAST:
      fprintf_filtered (stream, "Type @");
      gdb_print_host_address (exp->elts[elt].type, stream);
      fprintf_filtered (stream, " (");
      type_print (exp->elts[elt].type, NULL, stream, 0);
      fprintf_filtered (stream, ")");
      elt = dump_subexp (exp, stream, elt + 2);
      break;
    case OP_TYPE:
      fprintf_filtered (stream, "Type @");
      gdb_print_host_address (exp->elts[elt].type, stream);
      fprintf_filtered (stream, " (");
      type_print (exp->elts[elt].type, NULL, stream, 0);
      fprintf_filtered (stream, ")");
      elt += 2;
      break;
    case STRUCTOP_STRUCT:
    case STRUCTOP_PTR:
      {
	char *elem_name;
	int len;

	len = longest_to_int (exp->elts[elt].longconst);
	elem_name = &exp->elts[elt + 1].string;

	fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
	elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
      }
      break;
    case OP_SCOPE:
      {
	char *elem_name;
	int len;

	fprintf_filtered (stream, "Type @");
	gdb_print_host_address (exp->elts[elt].type, stream);
	fprintf_filtered (stream, " (");
	type_print (exp->elts[elt].type, NULL, stream, 0);
	fprintf_filtered (stream, ") ");

	len = longest_to_int (exp->elts[elt + 1].longconst);
	elem_name = &exp->elts[elt + 2].string;

	fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
	elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
      }
      break;
    default:
    case OP_NULL:
    case STRUCTOP_MEMBER:
    case STRUCTOP_MPTR:
    case MULTI_SUBSCRIPT:
    case OP_F77_UNDETERMINED_ARGLIST:
    case OP_COMPLEX:
    case OP_STRING:
    case OP_BITSTRING:
    case OP_BOOL:
    case OP_M2_STRING:
    case OP_THIS:
    case OP_LABELED:
    case OP_NAME:
    case OP_EXPRSTRING:
      fprintf_filtered (stream, "Unknown format");
    }

  indent -= 2;

  return elt;
}

void
dump_postfix_expression (struct expression *exp, struct ui_file *stream,
			 char *note)
{
  int elt;

  fprintf_filtered (stream, "Dump of expression @ ");
  gdb_print_host_address (exp, stream);
  fprintf_filtered (stream, ", %s:\nExpression: `", note);
  if (exp->elts[0].opcode != OP_TYPE)
    print_expression (exp, stream);
  else
    fputs_filtered ("Type printing not yet supported....", stream);
  fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
		    exp->language_defn->la_name, exp->nelts,
		    (long) sizeof (union exp_element));
  fputs_filtered ("\n", stream);

  for (elt = 0; elt < exp->nelts;)
    elt = dump_subexp (exp, stream, elt);
  fputs_filtered ("\n", stream);
}