gcc/read-rtl.c

   1 /* RTL reader for GCC.
   2    Copyright (C) 1987, 1988, 1991, 1994, 1997, 1998, 1999, 2000, 2001, 2002
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 #include "bconfig.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tm.h"
  26 #include "rtl.h"
  27 #include "obstack.h"
  28 #include "hashtab.h"
  29
  30 static htab_t md_constants;
  31
  32 static void fatal_with_file_and_line PARAMS ((FILE *, const char *, ...))
  33   ATTRIBUTE_PRINTF_2 ATTRIBUTE_NORETURN;
  34 static void fatal_expected_char PARAMS ((FILE *, int, int)) ATTRIBUTE_NORETURN;
  35 static void read_name           PARAMS ((char *, FILE *));
  36 static char *read_string        PARAMS ((struct obstack *, FILE *, int));
  37 static char *read_quoted_string PARAMS ((struct obstack *, FILE *));
  38 static char *read_braced_string PARAMS ((struct obstack *, FILE *));
  39 static void read_escape         PARAMS ((struct obstack *, FILE *));
  40 static hashval_t def_hash       PARAMS ((const void *));
  41 static int def_name_eq_p PARAMS ((const void *, const void *));
  42 static void read_constants PARAMS ((FILE *infile, char *tmp_char));
  43 static void validate_const_int PARAMS ((FILE *, const char *));
  44
  45 /* Subroutines of read_rtx.  */
  46
  47 /* The current line number for the file.  */
  48 int read_rtx_lineno = 1;
  49
  50 /* The filename for aborting with file and line.  */
  51 const char *read_rtx_filename = "<unknown>";
  52
  53 static void
  54 fatal_with_file_and_line (FILE *infile, const char *msg, ...)
  55 {
  56   char context[64];
  57   size_t i;
  58   int c;
  59   va_list ap;
  60
  61   va_start (ap, msg);
  62
  63   fprintf (stderr, "%s:%d: ", read_rtx_filename, read_rtx_lineno);
  64   vfprintf (stderr, msg, ap);
  65   putc ('\n', stderr);
  66
  67   /* Gather some following context.  */
  68   for (i = 0; i < sizeof (context)-1; ++i)
  69     {
  70       c = getc (infile);
  71       if (c == EOF)
  72         break;
  73       if (c == '\r' || c == '\n')
  74         break;
  75       context[i] = c;
  76     }
  77   context[i] = '\0';
  78
  79   fprintf (stderr, "%s:%d: following context is `%s'\n",
  80            read_rtx_filename, read_rtx_lineno, context);
  81
  82   va_end (ap);
  83   exit (1);
  84 }
  85
  86 /* Dump code after printing a message.  Used when read_rtx finds
  87    invalid data.  */
  88
  89 static void
  90 fatal_expected_char (infile, expected_c, actual_c)
  91      FILE *infile;
  92      int expected_c, actual_c;
  93 {
  94   fatal_with_file_and_line (infile, "expected character `%c', found `%c'",
  95                             expected_c, actual_c);
  96 }
  97
  98 /* Read chars from INFILE until a non-whitespace char
  99    and return that.  Comments, both Lisp style and C style,
 100    are treated as whitespace.
 101    Tools such as genflags use this function.  */
 102
 103 int
 104 read_skip_spaces (infile)
 105      FILE *infile;
 106 {
 107   int c;
 108
 109   while (1)
 110     {
 111       c = getc (infile);
 112       switch (c)
 113         {
 114         case '\n':
 115           read_rtx_lineno++;
 116           break;
 117
 118         case ' ': case '\t': case '\f': case '\r':
 119           break;
 120
 121         case ';':
 122           do
 123             c = getc (infile);
 124           while (c != '\n' && c != EOF);
 125           read_rtx_lineno++;
 126           break;
 127
 128         case '/':
 129           {
 130             int prevc;
 131             c = getc (infile);
 132             if (c != '*')
 133               fatal_expected_char (infile, '*', c);
 134
 135             prevc = 0;
 136             while ((c = getc (infile)) && c != EOF)
 137               {
 138                 if (c == '\n')
 139                    read_rtx_lineno++;
 140                 else if (prevc == '*' && c == '/')
 141                   break;
 142                 prevc = c;
 143               }
 144           }
 145           break;
 146
 147         default:
 148           return c;
 149         }
 150     }
 151 }
 152
 153 /* Read an rtx code name into the buffer STR[].
 154    It is terminated by any of the punctuation chars of rtx printed syntax.  */
 155
 156 static void
 157 read_name (str, infile)
 158      char *str;
 159      FILE *infile;
 160 {
 161   char *p;
 162   int c;
 163
 164   c = read_skip_spaces (infile);
 165
 166   p = str;
 167   while (1)
 168     {
 169       if (c == ' ' || c == '\n' || c == '\t' || c == '\f' || c == '\r')
 170         break;
 171       if (c == ':' || c == ')' || c == ']' || c == '"' || c == '/'
 172           || c == '(' || c == '[')
 173         {
 174           ungetc (c, infile);
 175           break;
 176         }
 177       *p++ = c;
 178       c = getc (infile);
 179     }
 180   if (p == str)
 181     fatal_with_file_and_line (infile, "missing name or number");
 182   if (c == '\n')
 183     read_rtx_lineno++;
 184
 185   *p = 0;
 186
 187   if (md_constants)
 188     {
 189       /* Do constant expansion.  */
 190       struct md_constant *def;
 191
 192       p = str;
 193       do
 194         {
 195           struct md_constant tmp_def;
 196
 197           tmp_def.name = p;
 198           def = htab_find (md_constants, &tmp_def);
 199           if (def)
 200             p = def->value;
 201         } while (def);
 202       if (p != str)
 203         strcpy (str, p);
 204     }
 205 }
 206
 207 /* Subroutine of the string readers.  Handles backslash escapes.
 208    Caller has read the backslash, but not placed it into the obstack.  */
 209 static void
 210 read_escape (ob, infile)
 211      struct obstack *ob;
 212      FILE *infile;
 213 {
 214   int c = getc (infile);
 215
 216   switch (c)
 217     {
 218       /* Backslash-newline is replaced by nothing, as in C.  */
 219     case '\n':
 220       read_rtx_lineno++;
 221       return;
 222
 223       /* \" \' \\ are replaced by the second character.  */
 224     case '\\':
 225     case '"':
 226     case '\'':
 227       break;
 228
 229       /* Standard C string escapes:
 230          \a \b \f \n \r \t \v
 231          \[0-7] \x
 232          all are passed through to the output string unmolested.
 233          In normal use these wind up in a string constant processed
 234          by the C compiler, which will translate them appropriately.
 235          We do not bother checking that \[0-7] are followed by up to
 236          two octal digits, or that \x is followed by N hex digits.
 237          \? \u \U are left out because they are not in traditional C.  */
 238     case 'a': case 'b': case 'f': case 'n': case 'r': case 't': case 'v':
 239     case '0': case '1': case '2': case '3': case '4': case '5': case '6':
 240     case '7': case 'x':
 241       obstack_1grow (ob, '\\');
 242       break;
 243
 244       /* \; makes stuff for a C string constant containing
 245          newline and tab.  */
 246     case ';':
 247       obstack_grow (ob, "\\n\\t", 4);
 248       return;
 249
 250       /* pass anything else through, but issue a warning.  */
 251     default:
 252       fprintf (stderr, "%s:%d: warning: unrecognized escape \\%c\n",
 253                read_rtx_filename, read_rtx_lineno, c);
 254       obstack_1grow (ob, '\\');
 255       break;
 256     }
 257
 258   obstack_1grow (ob, c);
 259 }
 260
 261
 262 /* Read a double-quoted string onto the obstack.  Caller has scanned
 263    the leading quote.  */
 264 static char *
 265 read_quoted_string (ob, infile)
 266      struct obstack *ob;
 267      FILE *infile;
 268 {
 269   int c;
 270
 271   while (1)
 272     {
 273       c = getc (infile); /* Read the string  */
 274       if (c == '\n')
 275         read_rtx_lineno++;
 276       else if (c == '\\')
 277         {
 278           read_escape (ob, infile);
 279           continue;
 280         }
 281       else if (c == '"')
 282         break;
 283
 284       obstack_1grow (ob, c);
 285     }
 286
 287   obstack_1grow (ob, 0);
 288   return obstack_finish (ob);
 289 }
 290
 291 /* Read a braced string (a la Tcl) onto the obstack.  Caller has
 292    scanned the leading brace.  Note that unlike quoted strings,
 293    the outermost braces _are_ included in the string constant.  */
 294 static char *
 295 read_braced_string (ob, infile)
 296      struct obstack *ob;
 297      FILE *infile;
 298 {
 299   int c;
 300   int brace_depth = 1;  /* caller-processed */
 301   unsigned long starting_read_rtx_lineno = read_rtx_lineno;
 302
 303   obstack_1grow (ob, '{');
 304   while (brace_depth)
 305     {
 306       c = getc (infile); /* Read the string  */
 307
 308       if (c == '\n')
 309         read_rtx_lineno++;
 310       else if (c == '{')
 311         brace_depth++;
 312       else if (c == '}')
 313         brace_depth--;
 314       else if (c == '\\')
 315         {
 316           read_escape (ob, infile);
 317           continue;
 318         }
 319       else if (c == EOF)
 320         fatal_with_file_and_line
 321           (infile, "missing closing } for opening brace on line %lu",
 322            starting_read_rtx_lineno);
 323
 324       obstack_1grow (ob, c);
 325     }
 326
 327   obstack_1grow (ob, 0);
 328   return obstack_finish (ob);
 329 }
 330
 331 /* Read some kind of string constant.  This is the high-level routine
 332    used by read_rtx.  It handles surrounding parentheses, leading star,
 333    and dispatch to the appropriate string constant reader.  */
 334
 335 static char *
 336 read_string (ob, infile, star_if_braced)
 337      struct obstack *ob;
 338      FILE *infile;
 339      int star_if_braced;
 340 {
 341   char *stringbuf;
 342   int saw_paren = 0;
 343   int c;
 344
 345   c = read_skip_spaces (infile);
 346   if (c == '(')
 347     {
 348       saw_paren = 1;
 349       c = read_skip_spaces (infile);
 350     }
 351
 352   if (c == '"')
 353     stringbuf = read_quoted_string (ob, infile);
 354   else if (c == '{')
 355     {
 356       if (star_if_braced)
 357         obstack_1grow (ob, '*');
 358       stringbuf = read_braced_string (ob, infile);
 359     }
 360   else
 361     fatal_with_file_and_line (infile, "expected `\"' or `{', found `%c'", c);
 362
 363   if (saw_paren)
 364     {
 365       c = read_skip_spaces (infile);
 366       if (c != ')')
 367         fatal_expected_char (infile, ')', c);
 368     }
 369
 370   return stringbuf;
 371 }
 372 \f
 373 /* Provide a version of a function to read a long long if the system does
 374    not provide one.  */
 375 #if HOST_BITS_PER_WIDE_INT > HOST_BITS_PER_LONG && !defined(HAVE_ATOLL) && !defined(HAVE_ATOQ)
 376 HOST_WIDE_INT atoll PARAMS ((const char *));
 377
 378 HOST_WIDE_INT
 379 atoll (p)
 380     const char *p;
 381 {
 382   int neg = 0;
 383   HOST_WIDE_INT tmp_wide;
 384
 385   while (ISSPACE (*p))
 386     p++;
 387   if (*p == '-')
 388     neg = 1, p++;
 389   else if (*p == '+')
 390     p++;
 391
 392   tmp_wide = 0;
 393   while (ISDIGIT (*p))
 394     {
 395       HOST_WIDE_INT new_wide = tmp_wide*10 + (*p - '0');
 396       if (new_wide < tmp_wide)
 397         {
 398           /* Return INT_MAX equiv on overflow.  */
 399           tmp_wide = (~(unsigned HOST_WIDE_INT) 0) >> 1;
 400           break;
 401         }
 402       tmp_wide = new_wide;
 403       p++;
 404     }
 405
 406   if (neg)
 407     tmp_wide = -tmp_wide;
 408   return tmp_wide;
 409 }
 410 #endif
 411
 412 /* Given a constant definition, return a hash code for its name.  */
 413 static hashval_t
 414 def_hash (def)
 415      const void *def;
 416 {
 417   unsigned result, i;
 418   const char *string = ((const struct md_constant *) def)->name;
 419
 420   for (result = i = 0;*string++ != '\0'; i++)
 421     result += ((unsigned char) *string << (i % CHAR_BIT));
 422   return result;
 423 }
 424
 425 /* Given two constant definitions, return true if they have the same name.  */
 426 static int
 427 def_name_eq_p (def1, def2)
 428      const void *def1, *def2;
 429 {
 430   return ! strcmp (((const struct md_constant *) def1)->name,
 431                    ((const struct md_constant *) def2)->name);
 432 }
 433
 434 /* INFILE is a FILE pointer to read text from.  TMP_CHAR is a buffer suitable
 435    to read a name or number into.  Process a define_constants directive,
 436    starting with the optional space after the "define_constants".  */
 437 static void
 438 read_constants (infile, tmp_char)
 439      FILE *infile;
 440      char *tmp_char;
 441 {
 442   int c;
 443   htab_t defs;
 444
 445   c = read_skip_spaces (infile);
 446   if (c != '[')
 447     fatal_expected_char (infile, '[', c);
 448   defs = md_constants;
 449   if (! defs)
 450     defs = htab_create (32, def_hash, def_name_eq_p, (htab_del) 0);
 451   /* Disable constant expansion during definition processing.  */
 452   md_constants = 0;
 453   while ( (c = read_skip_spaces (infile)) != ']')
 454     {
 455       struct md_constant *def;
 456       void **entry_ptr;
 457
 458       if (c != '(')
 459         fatal_expected_char (infile, '(', c);
 460       def = xmalloc (sizeof (struct md_constant));
 461       def->name = tmp_char;
 462       read_name (tmp_char, infile);
 463       entry_ptr = htab_find_slot (defs, def, TRUE);
 464       if (! *entry_ptr)
 465         def->name = xstrdup (tmp_char);
 466       c = read_skip_spaces (infile);
 467       ungetc (c, infile);
 468       read_name (tmp_char, infile);
 469       if (! *entry_ptr)
 470         {
 471           def->value = xstrdup (tmp_char);
 472           *entry_ptr = def;
 473         }
 474       else
 475         {
 476           def = *entry_ptr;
 477           if (strcmp (def->value, tmp_char))
 478             fatal_with_file_and_line (infile,
 479                                       "redefinition of %s, was %s, now %s",
 480                                       def->name, def->value, tmp_char);
 481         }
 482       c = read_skip_spaces (infile);
 483       if (c != ')')
 484         fatal_expected_char (infile, ')', c);
 485     }
 486   md_constants = defs;
 487   c = read_skip_spaces (infile);
 488   if (c != ')')
 489     fatal_expected_char (infile, ')', c);
 490 }
 491
 492 /* For every constant definition, call CALLBACK with two arguments:
 493    a pointer a pointer to the constant definition and INFO.
 494    Stops when CALLBACK returns zero.  */
 495 void
 496 traverse_md_constants (callback, info)
 497      htab_trav callback;
 498      void *info;
 499 {
 500   if (md_constants)
 501     htab_traverse (md_constants, callback, info);
 502 }
 503
 504 static void
 505 validate_const_int (infile, string)
 506      FILE *infile;
 507      const char *string;
 508 {
 509   const char *cp;
 510   int valid = 1;
 511
 512   cp = string;
 513   while (*cp && ISSPACE (*cp))
 514     cp++;
 515   if (*cp == '-' || *cp == '+')
 516     cp++;
 517   if (*cp == 0)
 518     valid = 0;
 519   for (; *cp; cp++)
 520     if (! ISDIGIT (*cp))
 521       valid = 0;
 522   if (!valid)
 523     fatal_with_file_and_line (infile, "invalid decimal constant \"%s\"\n", string);
 524 }
 525
 526 /* Read an rtx in printed representation from INFILE
 527    and return an actual rtx in core constructed accordingly.
 528    read_rtx is not used in the compiler proper, but rather in
 529    the utilities gen*.c that construct C code from machine descriptions.  */
 530
 531 rtx
 532 read_rtx (infile)
 533      FILE *infile;
 534 {
 535   int i, j;
 536   RTX_CODE tmp_code;
 537   const char *format_ptr;
 538   /* tmp_char is a buffer used for reading decimal integers
 539      and names of rtx types and machine modes.
 540      Therefore, 256 must be enough.  */
 541   char tmp_char[256];
 542   rtx return_rtx;
 543   int c;
 544   int tmp_int;
 545   HOST_WIDE_INT tmp_wide;
 546
 547   /* Obstack used for allocating RTL objects.  */
 548   static struct obstack rtl_obstack;
 549   static int initialized;
 550
 551   /* Linked list structure for making RTXs: */
 552   struct rtx_list
 553     {
 554       struct rtx_list *next;
 555       rtx value;                /* Value of this node.  */
 556     };
 557
 558   if (!initialized) {
 559     obstack_init (&rtl_obstack);
 560     initialized = 1;
 561   }
 562
 563 again:
 564   c = read_skip_spaces (infile); /* Should be open paren.  */
 565   if (c != '(')
 566     fatal_expected_char (infile, '(', c);
 567
 568   read_name (tmp_char, infile);
 569
 570   tmp_code = UNKNOWN;
 571
 572   if (! strcmp (tmp_char, "define_constants"))
 573     {
 574       read_constants (infile, tmp_char);
 575       goto again;
 576     }
 577   for (i = 0; i < NUM_RTX_CODE; i++)
 578     if (! strcmp (tmp_char, GET_RTX_NAME (i)))
 579       {
 580         tmp_code = (RTX_CODE) i;        /* get value for name */
 581         break;
 582       }
 583
 584   if (tmp_code == UNKNOWN)
 585     fatal_with_file_and_line (infile, "unknown rtx code `%s'", tmp_char);
 586
 587   /* (NIL) stands for an expression that isn't there.  */
 588   if (tmp_code == NIL)
 589     {
 590       /* Discard the closeparen.  */
 591       while ((c = getc (infile)) && c != ')')
 592         ;
 593
 594       return 0;
 595     }
 596
 597   /* If we end up with an insn expression then we free this space below.  */
 598   return_rtx = rtx_alloc (tmp_code);
 599   format_ptr = GET_RTX_FORMAT (GET_CODE (return_rtx));
 600
 601   /* If what follows is `: mode ', read it and
 602      store the mode in the rtx.  */
 603
 604   i = read_skip_spaces (infile);
 605   if (i == ':')
 606     {
 607       read_name (tmp_char, infile);
 608       for (j = 0; j < NUM_MACHINE_MODES; j++)
 609         if (! strcmp (GET_MODE_NAME (j), tmp_char))
 610           break;
 611
 612       if (j == MAX_MACHINE_MODE)
 613         fatal_with_file_and_line (infile, "unknown mode `%s'", tmp_char);
 614
 615       PUT_MODE (return_rtx, (enum machine_mode) j);
 616     }
 617   else
 618     ungetc (i, infile);
 619
 620   for (i = 0; i < GET_RTX_LENGTH (GET_CODE (return_rtx)); i++)
 621     switch (*format_ptr++)
 622       {
 623         /* 0 means a field for internal use only.
 624            Don't expect it to be present in the input.  */
 625       case '0':
 626         break;
 627
 628       case 'e':
 629       case 'u':
 630         XEXP (return_rtx, i) = read_rtx (infile);
 631         break;
 632
 633       case 'V':
 634         /* 'V' is an optional vector: if a closeparen follows,
 635            just store NULL for this element.  */
 636         c = read_skip_spaces (infile);
 637         ungetc (c, infile);
 638         if (c == ')')
 639           {
 640             XVEC (return_rtx, i) = 0;
 641             break;
 642           }
 643         /* Now process the vector.  */
 644
 645       case 'E':
 646         {
 647           /* Obstack to store scratch vector in.  */
 648           struct obstack vector_stack;
 649           int list_counter = 0;
 650           rtvec return_vec = NULL_RTVEC;
 651
 652           c = read_skip_spaces (infile);
 653           if (c != '[')
 654             fatal_expected_char (infile, '[', c);
 655
 656           /* add expressions to a list, while keeping a count */
 657           obstack_init (&vector_stack);
 658           while ((c = read_skip_spaces (infile)) && c != ']')
 659             {
 660               ungetc (c, infile);
 661               list_counter++;
 662               obstack_ptr_grow (&vector_stack, read_rtx (infile));
 663             }
 664           if (list_counter > 0)
 665             {
 666               return_vec = rtvec_alloc (list_counter);
 667               memcpy (&return_vec->elem[0], obstack_finish (&vector_stack),
 668                       list_counter * sizeof (rtx));
 669             }
 670           XVEC (return_rtx, i) = return_vec;
 671           obstack_free (&vector_stack, NULL);
 672           /* close bracket gotten */
 673         }
 674         break;
 675
 676       case 'S':
 677         /* 'S' is an optional string: if a closeparen follows,
 678            just store NULL for this element.  */
 679         c = read_skip_spaces (infile);
 680         ungetc (c, infile);
 681         if (c == ')')
 682           {
 683             XSTR (return_rtx, i) = 0;
 684             break;
 685           }
 686
 687       case 'T':
 688       case 's':
 689         {
 690           char *stringbuf;
 691
 692           /* The output template slot of a DEFINE_INSN,
 693              DEFINE_INSN_AND_SPLIT, or DEFINE_PEEPHOLE automatically
 694              gets a star inserted as its first character, if it is
 695              written with a brace block instead of a string constant.  */
 696           int star_if_braced = (format_ptr[-1] == 'T');
 697
 698           stringbuf = read_string (&rtl_obstack, infile, star_if_braced);
 699
 700           /* For insn patterns, we want to provide a default name
 701              based on the file and line, like "*foo.md:12", if the
 702              given name is blank.  These are only for define_insn and
 703              define_insn_and_split, to aid debugging.  */
 704           if (*stringbuf == '\0'
 705               && i == 0
 706               && (GET_CODE (return_rtx) == DEFINE_INSN
 707                   || GET_CODE (return_rtx) == DEFINE_INSN_AND_SPLIT))
 708             {
 709               char line_name[20];
 710               const char *fn = (read_rtx_filename ? read_rtx_filename : "rtx");
 711               const char *slash;
 712               for (slash = fn; *slash; slash ++)
 713                 if (*slash == '/' || *slash == '\\' || *slash == ':')
 714                   fn = slash + 1;
 715               obstack_1grow (&rtl_obstack, '*');
 716               obstack_grow (&rtl_obstack, fn, strlen (fn));
 717               sprintf (line_name, ":%d", read_rtx_lineno);
 718               obstack_grow (&rtl_obstack, line_name, strlen (line_name)+1);
 719               stringbuf = (char *) obstack_finish (&rtl_obstack);
 720             }
 721
 722           if (star_if_braced)
 723             XTMPL (return_rtx, i) = stringbuf;
 724           else
 725             XSTR (return_rtx, i) = stringbuf;
 726         }
 727         break;
 728
 729       case 'w':
 730         read_name (tmp_char, infile);
 731         validate_const_int (infile, tmp_char);
 732 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
 733         tmp_wide = atoi (tmp_char);
 734 #else
 735 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
 736         tmp_wide = atol (tmp_char);
 737 #else
 738         /* Prefer atoll over atoq, since the former is in the ISO C99 standard.
 739            But prefer not to use our hand-rolled function above either.  */
 740 #if defined(HAVE_ATOLL) || !defined(HAVE_ATOQ)
 741         tmp_wide = atoll (tmp_char);
 742 #else
 743         tmp_wide = atoq (tmp_char);
 744 #endif
 745 #endif
 746 #endif
 747         XWINT (return_rtx, i) = tmp_wide;
 748         break;
 749
 750       case 'i':
 751       case 'n':
 752         read_name (tmp_char, infile);
 753         validate_const_int (infile, tmp_char);
 754         tmp_int = atoi (tmp_char);
 755         XINT (return_rtx, i) = tmp_int;
 756         break;
 757
 758       default:
 759         fprintf (stderr,
 760                  "switch format wrong in rtl.read_rtx(). format was: %c.\n",
 761                  format_ptr[-1]);
 762         fprintf (stderr, "\tfile position: %ld\n", ftell (infile));
 763         abort ();
 764       }
 765
 766   c = read_skip_spaces (infile);
 767   if (c != ')')
 768     fatal_expected_char (infile, ')', c);
 769
 770   return return_rtx;
 771 }