summaryrefslogtreecommitdiffstats
path: root/contrib/gcc/read-rtl.c
blob: 5b937ec9f3bd592a25c5f809d74fef68452d878d (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
/* RTL reader for GNU C Compiler.
   Copyright (C) 1987, 1988, 1991, 1994, 1997, 1998, 1999, 2000, 2001, 2002
   Free Software Foundation, Inc.

This file is part of GCC.

GCC 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, or (at your option) any later
version.

GCC 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 GCC; see the file COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  */

#include "hconfig.h"
#include "system.h"
#include "rtl.h"
#include "obstack.h"
#include "hashtab.h"

#ifndef ISDIGIT
#include <ctype.h>
#define ISDIGIT isdigit
#define ISSPACE isspace
#endif

#define	obstack_chunk_alloc	xmalloc
#define	obstack_chunk_free	free

static htab_t md_constants;

static void fatal_with_file_and_line PARAMS ((FILE *, const char *, ...))
  ATTRIBUTE_PRINTF_2 ATTRIBUTE_NORETURN;
static void fatal_expected_char PARAMS ((FILE *, int, int)) ATTRIBUTE_NORETURN;
static void read_name		PARAMS ((char *, FILE *));
static char *read_string	PARAMS ((struct obstack *, FILE *, int));
static char *read_quoted_string	PARAMS ((struct obstack *, FILE *));
static char *read_braced_string	PARAMS ((struct obstack *, FILE *));
static void read_escape		PARAMS ((struct obstack *, FILE *));
static unsigned def_hash PARAMS ((const void *));
static int def_name_eq_p PARAMS ((const void *, const void *));
static void read_constants PARAMS ((FILE *infile, char *tmp_char));
static void validate_const_int PARAMS ((FILE *, const char *));

/* Subroutines of read_rtx.  */

/* The current line number for the file.  */
int read_rtx_lineno = 1;

/* The filename for aborting with file and line.  */
const char *read_rtx_filename = "<unknown>";

static void
fatal_with_file_and_line VPARAMS ((FILE *infile, const char *msg, ...))
{
  char context[64];
  size_t i;
  int c;

  VA_OPEN (ap, msg);
  VA_FIXEDARG (ap, FILE *, infile);
  VA_FIXEDARG (ap, const char *, msg);

  fprintf (stderr, "%s:%d: ", read_rtx_filename, read_rtx_lineno);
  vfprintf (stderr, msg, ap);
  putc ('\n', stderr);

  /* Gather some following context.  */
  for (i = 0; i < sizeof (context)-1; ++i)
    {
      c = getc (infile);
      if (c == EOF)
	break;
      if (c == '\r' || c == '\n')
	break;
      context[i] = c;
    }
  context[i] = '\0';

  fprintf (stderr, "%s:%d: following context is `%s'\n",
	   read_rtx_filename, read_rtx_lineno, context);

  VA_CLOSE (ap);
  exit (1);
}

/* Dump code after printing a message.  Used when read_rtx finds
   invalid data.  */

static void
fatal_expected_char (infile, expected_c, actual_c)
     FILE *infile;
     int expected_c, actual_c;
{
  fatal_with_file_and_line (infile, "expected character `%c', found `%c'",
			    expected_c, actual_c);
}

/* Read chars from INFILE until a non-whitespace char
   and return that.  Comments, both Lisp style and C style,
   are treated as whitespace.
   Tools such as genflags use this function.  */

int
read_skip_spaces (infile)
     FILE *infile;
{
  int c;

  while (1)
    {
      c = getc (infile);
      switch (c)
	{
	case '\n':
	  read_rtx_lineno++;
	  break;

	case ' ': case '\t': case '\f': case '\r':
	  break;

	case ';':
	  do
	    c = getc (infile);
	  while (c != '\n' && c != EOF);
	  read_rtx_lineno++;
	  break;

	case '/':
	  {
	    int prevc;
	    c = getc (infile);
	    if (c != '*')
	      fatal_expected_char (infile, '*', c);

	    prevc = 0;
	    while ((c = getc (infile)) && c != EOF)
	      {
		if (c == '\n')
		   read_rtx_lineno++;
	        else if (prevc == '*' && c == '/')
		  break;
	        prevc = c;
	      }
	  }
	  break;

	default:
	  return c;
	}
    }
}

/* Read an rtx code name into the buffer STR[].
   It is terminated by any of the punctuation chars of rtx printed syntax.  */

static void
read_name (str, infile)
     char *str;
     FILE *infile;
{
  char *p;
  int c;

  c = read_skip_spaces (infile);

  p = str;
  while (1)
    {
      if (c == ' ' || c == '\n' || c == '\t' || c == '\f' || c == '\r')
	break;
      if (c == ':' || c == ')' || c == ']' || c == '"' || c == '/'
	  || c == '(' || c == '[')
	{
	  ungetc (c, infile);
	  break;
	}
      *p++ = c;
      c = getc (infile);
    }
  if (p == str)
    fatal_with_file_and_line (infile, "missing name or number");
  if (c == '\n')
    read_rtx_lineno++;

  *p = 0;

  if (md_constants)
    {
      /* Do constant expansion.  */
      struct md_constant *def;

      p = str;
      do
	{
	  struct md_constant tmp_def;

	  tmp_def.name = p;
	  def = htab_find (md_constants, &tmp_def);
	  if (def)
	    p = def->value;
	} while (def);
      if (p != str)
	strcpy (str, p);
    }
}

/* Subroutine of the string readers.  Handles backslash escapes.
   Caller has read the backslash, but not placed it into the obstack.  */
static void
read_escape (ob, infile)
     struct obstack *ob;
     FILE *infile;
{
  int c = getc (infile);

  switch (c)
    {
      /* Backslash-newline is replaced by nothing, as in C.  */
    case '\n':
      read_rtx_lineno++;
      return;

      /* \" \' \\ are replaced by the second character.  */
    case '\\':
    case '"':
    case '\'':
      break;

      /* Standard C string escapes:
	 \a \b \f \n \r \t \v
	 \[0-7] \x
	 all are passed through to the output string unmolested.
	 In normal use these wind up in a string constant processed
	 by the C compiler, which will translate them appropriately.
	 We do not bother checking that \[0-7] are followed by up to
	 two octal digits, or that \x is followed by N hex digits.
	 \? \u \U are left out because they are not in traditional C.  */
    case 'a': case 'b': case 'f': case 'n': case 'r': case 't': case 'v':
    case '0': case '1': case '2': case '3': case '4': case '5': case '6':
    case '7': case 'x':
      obstack_1grow (ob, '\\');
      break;

      /* \; makes stuff for a C string constant containing
	 newline and tab.  */
    case ';':
      obstack_grow (ob, "\\n\\t", 4);
      return;

      /* pass anything else through, but issue a warning.  */
    default:
      fprintf (stderr, "%s:%d: warning: unrecognized escape \\%c\n",
	       read_rtx_filename, read_rtx_lineno, c);
      obstack_1grow (ob, '\\');
      break;
    }

  obstack_1grow (ob, c);
}
      

/* Read a double-quoted string onto the obstack.  Caller has scanned
   the leading quote.  */
static char *
read_quoted_string (ob, infile)
     struct obstack *ob;
     FILE *infile;
{
  int c;

  while (1)
    {
      c = getc (infile); /* Read the string  */
      if (c == '\n')
	read_rtx_lineno++;
      else if (c == '\\')
	{
	  read_escape (ob, infile);
	  continue;
	}
      else if (c == '"')
	break;

      obstack_1grow (ob, c);
    }

  obstack_1grow (ob, 0);
  return obstack_finish (ob);
}

/* Read a braced string (a la Tcl) onto the obstack.  Caller has
   scanned the leading brace.  Note that unlike quoted strings,
   the outermost braces _are_ included in the string constant.  */
static char *
read_braced_string (ob, infile)
     struct obstack *ob;
     FILE *infile;
{
  int c;
  int brace_depth = 1;  /* caller-processed */

  obstack_1grow (ob, '{');
  while (brace_depth)
    {
      c = getc (infile); /* Read the string  */
      if (c == '\n')
	read_rtx_lineno++;
      else if (c == '{')
	brace_depth++;
      else if (c == '}')
	brace_depth--;
      else if (c == '\\')
	{
	  read_escape (ob, infile);
	  continue;
	}

      obstack_1grow (ob, c);
    }
      
  obstack_1grow (ob, 0);
  return obstack_finish (ob);
}

/* Read some kind of string constant.  This is the high-level routine
   used by read_rtx.  It handles surrounding parentheses, leading star,
   and dispatch to the appropriate string constant reader.  */

static char *
read_string (ob, infile, star_if_braced)
     struct obstack *ob;
     FILE *infile;
     int star_if_braced;
{
  char *stringbuf;
  int saw_paren = 0;
  int c;

  c = read_skip_spaces (infile);
  if (c == '(')
    {
      saw_paren = 1;
      c = read_skip_spaces (infile);
    }

  if (c == '"')
    stringbuf = read_quoted_string (ob, infile);
  else if (c == '{')
    {
      if (star_if_braced)
	obstack_1grow (ob, '*');
      stringbuf = read_braced_string (ob, infile);
    }
  else
    fatal_with_file_and_line (infile, "expected `\"' or `{', found `%c'", c);
       
  if (saw_paren)
    {
      c = read_skip_spaces (infile);
      if (c != ')')
	fatal_expected_char (infile, ')', c);
    }

  return stringbuf;
}

/* Provide a version of a function to read a long long if the system does
   not provide one.  */
#if HOST_BITS_PER_WIDE_INT > HOST_BITS_PER_LONG && !defined(HAVE_ATOLL) && !defined(HAVE_ATOQ)
HOST_WIDE_INT
atoll (p)
    const char *p;
{
  int neg = 0;
  HOST_WIDE_INT tmp_wide;

  while (ISSPACE (*p))
    p++;
  if (*p == '-')
    neg = 1, p++;
  else if (*p == '+')
    p++;

  tmp_wide = 0;
  while (ISDIGIT (*p))
    {
      HOST_WIDE_INT new_wide = tmp_wide*10 + (*p - '0');
      if (new_wide < tmp_wide)
	{
	  /* Return INT_MAX equiv on overflow.  */
	  tmp_wide = (~(unsigned HOST_WIDE_INT) 0) >> 1;
	  break;
	}
      tmp_wide = new_wide;
      p++;
    }

  if (neg)
    tmp_wide = -tmp_wide;
  return tmp_wide;
}
#endif

/* Given a constant definition, return a hash code for its name.  */
static unsigned
def_hash (def)
     const void *def;
{
  unsigned result, i;
  const char *string = ((const struct md_constant *) def)->name;

  for (result = i = 0;*string++ != '\0'; i++)
    result += ((unsigned char) *string << (i % CHAR_BIT));
  return result;
}

/* Given two constant definitions, return true if they have the same name.  */
static int
def_name_eq_p (def1, def2)
     const void *def1, *def2;
{
  return ! strcmp (((const struct md_constant *) def1)->name,
		   ((const struct md_constant *) def2)->name);
}

/* INFILE is a FILE pointer to read text from.  TMP_CHAR is a buffer suitable
   to read a name or number into.  Process a define_constants directive,
   starting with the optional space after the "define_constants".  */
static void
read_constants (infile, tmp_char)
     FILE *infile;
     char *tmp_char;
{
  int c;
  htab_t defs;

  c = read_skip_spaces (infile);
  if (c != '[')
    fatal_expected_char (infile, '[', c);
  defs = md_constants;
  if (! defs)
    defs = htab_create (32, def_hash, def_name_eq_p, (htab_del) 0);
  /* Disable constant expansion during definition processing.  */
  md_constants = 0;
  while ( (c = read_skip_spaces (infile)) != ']')
    {
      struct md_constant *def;
      void **entry_ptr;

      if (c != '(')
	fatal_expected_char (infile, '(', c);
      def = xmalloc (sizeof (struct md_constant));
      def->name = tmp_char;
      read_name (tmp_char, infile);
      entry_ptr = htab_find_slot (defs, def, TRUE);
      if (! *entry_ptr)
	def->name = xstrdup (tmp_char);
      c = read_skip_spaces (infile);
      ungetc (c, infile);
      read_name (tmp_char, infile);
      if (! *entry_ptr)
	{
	  def->value = xstrdup (tmp_char);
	  *entry_ptr = def;
	}
      else
	{
	  def = *entry_ptr;
	  if (strcmp (def->value, tmp_char))
	    fatal_with_file_and_line (infile,
				      "redefinition of %s, was %s, now %s",
				      def->name, def->value, tmp_char);
	}
      c = read_skip_spaces (infile);
      if (c != ')')
	fatal_expected_char (infile, ')', c);
    }
  md_constants = defs;
  c = read_skip_spaces (infile);
  if (c != ')')
    fatal_expected_char (infile, ')', c);
}

/* For every constant definition, call CALLBACK with two arguments:
   a pointer a pointer to the constant definition and INFO.
   Stops when CALLBACK returns zero.  */
void
traverse_md_constants (callback, info)
     htab_trav callback;
     void *info;
{
  if (md_constants)
    htab_traverse (md_constants, callback, info);
}

static void
validate_const_int (infile, string)
     FILE *infile;
     const char *string;
{
  const char *cp;
  int valid = 1;

  cp = string;
  while (*cp && ISSPACE (*cp))
    cp++;
  if (*cp == '-' || *cp == '+')
    cp++;
  if (*cp == 0)
    valid = 0;
  for (; *cp; cp++)
    if (! ISDIGIT (*cp))
      valid = 0;
  if (!valid)
    fatal_with_file_and_line (infile, "invalid decimal constant \"%s\"\n", string);
}

/* Read an rtx in printed representation from INFILE
   and return an actual rtx in core constructed accordingly.
   read_rtx is not used in the compiler proper, but rather in
   the utilities gen*.c that construct C code from machine descriptions.  */

rtx
read_rtx (infile)
     FILE *infile;
{
  int i, j;
  RTX_CODE tmp_code;
  const char *format_ptr;
  /* tmp_char is a buffer used for reading decimal integers
     and names of rtx types and machine modes.
     Therefore, 256 must be enough.  */
  char tmp_char[256];
  rtx return_rtx;
  int c;
  int tmp_int;
  HOST_WIDE_INT tmp_wide;

  /* Obstack used for allocating RTL objects.  */
  static struct obstack rtl_obstack;
  static int initialized;

  /* Linked list structure for making RTXs: */
  struct rtx_list
    {
      struct rtx_list *next;
      rtx value;		/* Value of this node.  */
    };

  if (!initialized) {
    obstack_init (&rtl_obstack);
    initialized = 1;
  }

again:
  c = read_skip_spaces (infile); /* Should be open paren.  */
  if (c != '(')
    fatal_expected_char (infile, '(', c);

  read_name (tmp_char, infile);

  tmp_code = UNKNOWN;

  if (! strcmp (tmp_char, "define_constants"))
    {
      read_constants (infile, tmp_char);
      goto again;
    }
  for (i = 0; i < NUM_RTX_CODE; i++)
    if (! strcmp (tmp_char, GET_RTX_NAME (i)))
      {
	tmp_code = (RTX_CODE) i;	/* get value for name */
	break;
      }

  if (tmp_code == UNKNOWN)
    fatal_with_file_and_line (infile, "unknown rtx code `%s'", tmp_char);

  /* (NIL) stands for an expression that isn't there.  */
  if (tmp_code == NIL)
    {
      /* Discard the closeparen.  */
      while ((c = getc (infile)) && c != ')')
	;

      return 0;
    }

  /* If we end up with an insn expression then we free this space below.  */
  return_rtx = rtx_alloc (tmp_code);
  format_ptr = GET_RTX_FORMAT (GET_CODE (return_rtx));

  /* If what follows is `: mode ', read it and
     store the mode in the rtx.  */

  i = read_skip_spaces (infile);
  if (i == ':')
    {
      read_name (tmp_char, infile);
      for (j = 0; j < NUM_MACHINE_MODES; j++)
	if (! strcmp (GET_MODE_NAME (j), tmp_char))
	  break;

      if (j == MAX_MACHINE_MODE)
	fatal_with_file_and_line (infile, "unknown mode `%s'", tmp_char);

      PUT_MODE (return_rtx, (enum machine_mode) j);
    }
  else
    ungetc (i, infile);

  for (i = 0; i < GET_RTX_LENGTH (GET_CODE (return_rtx)); i++)
    switch (*format_ptr++)
      {
	/* 0 means a field for internal use only.
	   Don't expect it to be present in the input.  */
      case '0':
	break;

      case 'e':
      case 'u':
	XEXP (return_rtx, i) = read_rtx (infile);
	break;

      case 'V':
	/* 'V' is an optional vector: if a closeparen follows,
	   just store NULL for this element.  */
	c = read_skip_spaces (infile);
	ungetc (c, infile);
	if (c == ')')
	  {
	    XVEC (return_rtx, i) = 0;
	    break;
 	  }
	/* Now process the vector.  */

      case 'E':
	{
	  /* Obstack to store scratch vector in.  */
	  struct obstack vector_stack;
	  int list_counter = 0;
	  rtvec return_vec = NULL_RTVEC;

	  c = read_skip_spaces (infile);
	  if (c != '[')
	    fatal_expected_char (infile, '[', c);

	  /* add expressions to a list, while keeping a count */
	  obstack_init (&vector_stack);
	  while ((c = read_skip_spaces (infile)) && c != ']')
	    {
	      ungetc (c, infile);
	      list_counter++;
	      obstack_ptr_grow (&vector_stack, (PTR) read_rtx (infile));
	    }
	  if (list_counter > 0)
	    {
	      return_vec = rtvec_alloc (list_counter);
	      memcpy (&return_vec->elem[0], obstack_finish (&vector_stack),
		      list_counter * sizeof (rtx));
	    }
	  XVEC (return_rtx, i) = return_vec;
	  obstack_free (&vector_stack, NULL);
	  /* close bracket gotten */
	}
	break;

      case 'S':
	/* 'S' is an optional string: if a closeparen follows,
	   just store NULL for this element.  */
	c = read_skip_spaces (infile);
	ungetc (c, infile);
	if (c == ')')
	  {
	    XSTR (return_rtx, i) = 0;
	    break;
	  }

      case 'T':
      case 's':
	{
	  char *stringbuf;

	  /* The output template slot of a DEFINE_INSN,
	     DEFINE_INSN_AND_SPLIT, or DEFINE_PEEPHOLE automatically
	     gets a star inserted as its first character, if it is
	     written with a brace block instead of a string constant.  */
	  int star_if_braced = (format_ptr[-1] == 'T');
	    
	  stringbuf = read_string (&rtl_obstack, infile, star_if_braced);

	  /* For insn patterns, we want to provide a default name
	     based on the file and line, like "*foo.md:12", if the
	     given name is blank.  These are only for define_insn and
	     define_insn_and_split, to aid debugging.  */
	  if (*stringbuf == '\0'
	      && i == 0
	      && (GET_CODE (return_rtx) == DEFINE_INSN
		  || GET_CODE (return_rtx) == DEFINE_INSN_AND_SPLIT))
	    {
	      char line_name[20];
	      const char *fn = (read_rtx_filename ? read_rtx_filename : "rtx");
	      const char *slash;
	      for (slash = fn; *slash; slash ++)
		if (*slash == '/' || *slash == '\\' || *slash == ':')
		  fn = slash + 1;
	      obstack_1grow (&rtl_obstack, '*');
	      obstack_grow (&rtl_obstack, fn, strlen (fn));
	      sprintf (line_name, ":%d", read_rtx_lineno);
	      obstack_grow (&rtl_obstack, line_name, strlen (line_name)+1);
	      stringbuf = (char *) obstack_finish (&rtl_obstack);
	    }

	  if (star_if_braced)
	    XTMPL (return_rtx, i) = stringbuf;
	  else
	    XSTR (return_rtx, i) = stringbuf;
	}
	break;

      case 'w':
	read_name (tmp_char, infile);
	validate_const_int (infile, tmp_char);
#if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
	tmp_wide = atoi (tmp_char);
#else
#if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
	tmp_wide = atol (tmp_char);
#else
	/* Prefer atoll over atoq, since the former is in the ISO C99 standard.
	   But prefer not to use our hand-rolled function above either.  */
#if defined(HAVE_ATOLL) || !defined(HAVE_ATOQ)
	tmp_wide = atoll (tmp_char);
#else
	tmp_wide = atoq (tmp_char);
#endif
#endif
#endif
	XWINT (return_rtx, i) = tmp_wide;
	break;

      case 'i':
      case 'n':
	read_name (tmp_char, infile);
	validate_const_int (infile, tmp_char);
	tmp_int = atoi (tmp_char);
	XINT (return_rtx, i) = tmp_int;
	break;

      default:
	fprintf (stderr,
		 "switch format wrong in rtl.read_rtx(). format was: %c.\n",
		 format_ptr[-1]);
	fprintf (stderr, "\tfile position: %ld\n", ftell (infile));
	abort ();
      }

  c = read_skip_spaces (infile);
  if (c != ')')
    fatal_expected_char (infile, ')', c);

  return return_rtx;
}
OpenPOWER on IntegriCloud