gcc/c-lex.c

   1 /* Lexical analyzer for C and Objective C.
   2    Copyright (C) 1987, 88, 89, 92, 94-97, 1998 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #include "config.h"
  22 #include "system.h"
  23 #include <setjmp.h>
  24
  25 #include "rtl.h"
  26 #include "tree.h"
  27 #include "input.h"
  28 #include "output.h"
  29 #include "c-lex.h"
  30 #include "c-tree.h"
  31 #include "flags.h"
  32 #include "c-parse.h"
  33 #include "c-pragma.h"
  34 #include "toplev.h"
  35
  36 #ifdef MULTIBYTE_CHARS
  37 #include "mbchar.h"
  38 #include <locale.h>
  39 #endif /* MULTIBYTE_CHARS */
  40
  41 #if USE_CPPLIB
  42 #include "cpplib.h"
  43 extern cpp_reader  parse_in;
  44 extern cpp_options parse_options;
  45 #else
  46 /* Stream for reading from the input file.  */
  47 FILE *finput;
  48 #endif
  49
  50 extern void yyprint                     PROTO((FILE *, int, YYSTYPE));
  51
  52 /* The elements of `ridpointers' are identifier nodes
  53    for the reserved type names and storage classes.
  54    It is indexed by a RID_... value.  */
  55 tree ridpointers[(int) RID_MAX];
  56
  57 /* Cause the `yydebug' variable to be defined.  */
  58 #define YYDEBUG 1
  59
  60 #if USE_CPPLIB
  61 extern unsigned char *yy_cur, *yy_lim;
  62
  63 extern int yy_get_token ();
  64
  65 #define GETC() (yy_cur < yy_lim ? *yy_cur++ : yy_get_token ())
  66 #define UNGETC(c) ((c), yy_cur--)
  67 #else
  68 #define GETC() getc (finput)
  69 #define UNGETC(c) ungetc (c, finput)
  70 #endif
  71
  72 /* the declaration found for the last IDENTIFIER token read in.
  73    yylex must look this up to detect typedefs, which get token type TYPENAME,
  74    so it is left around in case the identifier is not a typedef but is
  75    used in a context which makes it a reference to a variable.  */
  76 tree lastiddecl;
  77
  78 /* Nonzero enables objc features.  */
  79
  80 int doing_objc_thang;
  81
  82 extern int yydebug;
  83
  84 /* File used for outputting assembler code.  */
  85 extern FILE *asm_out_file;
  86
  87 #ifndef WCHAR_TYPE_SIZE
  88 #ifdef INT_TYPE_SIZE
  89 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
  90 #else
  91 #define WCHAR_TYPE_SIZE BITS_PER_WORD
  92 #endif
  93 #endif
  94
  95 /* Number of bytes in a wide character.  */
  96 #define WCHAR_BYTES (WCHAR_TYPE_SIZE / BITS_PER_UNIT)
  97
  98 static int maxtoken;            /* Current nominal length of token buffer.  */
  99 char *token_buffer;     /* Pointer to token buffer.
 100                            Actual allocated length is maxtoken + 2.
 101                            This is not static because objc-parse.y uses it.  */
 102
 103 static int indent_level = 0;        /* Number of { minus number of }. */
 104
 105 /* Nonzero if end-of-file has been seen on input.  */
 106 static int end_of_file;
 107
 108 #if !USE_CPPLIB
 109 /* Buffered-back input character; faster than using ungetc.  */
 110 static int nextchar = -1;
 111 #endif
 112
 113 #ifdef HANDLE_GENERIC_PRAGMAS
 114 static int handle_generic_pragma        PROTO((int));
 115 #endif /* HANDLE_GENERIC_PRAGMAS */
 116 static int whitespace_cr                PROTO((int));
 117 static int skip_white_space             PROTO((int));
 118 static int skip_white_space_on_line     PROTO((void));
 119 static char *extend_token_buffer        PROTO((char *));
 120 static int readescape                   PROTO((int *));
 121 \f
 122 /* Do not insert generated code into the source, instead, include it.
 123    This allows us to build gcc automatically even for targets that
 124    need to add or modify the reserved keyword lists.  */
 125 #include "c-gperf.h"
 126 \f
 127 /* Return something to represent absolute declarators containing a *.
 128    TARGET is the absolute declarator that the * contains.
 129    TYPE_QUALS is a list of modifiers such as const or volatile
 130    to apply to the pointer type, represented as identifiers.
 131
 132    We return an INDIRECT_REF whose "contents" are TARGET
 133    and whose type is the modifier list.  */
 134
 135 tree
 136 make_pointer_declarator (type_quals, target)
 137      tree type_quals, target;
 138 {
 139   return build1 (INDIRECT_REF, type_quals, target);
 140 }
 141 \f
 142 void
 143 forget_protocol_qualifiers ()
 144 {
 145   int i, n = sizeof wordlist / sizeof (struct resword);
 146
 147   for (i = 0; i < n; i++)
 148     if ((int) wordlist[i].rid >= (int) RID_IN
 149         && (int) wordlist[i].rid <= (int) RID_ONEWAY)
 150       wordlist[i].name = "";
 151 }
 152
 153 void
 154 remember_protocol_qualifiers ()
 155 {
 156   int i, n = sizeof wordlist / sizeof (struct resword);
 157
 158   for (i = 0; i < n; i++)
 159     if (wordlist[i].rid == RID_IN)
 160       wordlist[i].name = "in";
 161     else if (wordlist[i].rid == RID_OUT)
 162       wordlist[i].name = "out";
 163     else if (wordlist[i].rid == RID_INOUT)
 164       wordlist[i].name = "inout";
 165     else if (wordlist[i].rid == RID_BYCOPY)
 166       wordlist[i].name = "bycopy";
 167     else if (wordlist[i].rid == RID_BYREF)
 168       wordlist[i].name = "byref";
 169     else if (wordlist[i].rid == RID_ONEWAY)
 170       wordlist[i].name = "oneway";
 171 }
 172 \f
 173 char *
 174 init_parse (filename)
 175      char *filename;
 176 {
 177 #if !USE_CPPLIB
 178   /* Open input file.  */
 179   if (filename == 0 || !strcmp (filename, "-"))
 180     {
 181       finput = stdin;
 182       filename = "stdin";
 183     }
 184   else
 185     finput = fopen (filename, "r");
 186   if (finput == 0)
 187     pfatal_with_name (filename);
 188
 189 #ifdef IO_BUFFER_SIZE
 190   setvbuf (finput, (char *) xmalloc (IO_BUFFER_SIZE), _IOFBF, IO_BUFFER_SIZE);
 191 #endif
 192 #endif /* !USE_CPPLIB */
 193
 194   init_lex ();
 195
 196 #if USE_CPPLIB
 197   yy_cur = "\n";
 198   yy_lim = yy_cur+1;
 199
 200   parse_in.show_column = 1;
 201   if (! cpp_start_read (&parse_in, filename))
 202     abort ();
 203 #endif
 204
 205   return filename;
 206 }
 207
 208 void
 209 finish_parse ()
 210 {
 211 #if USE_CPPLIB
 212   cpp_finish (&parse_in);
 213 #else
 214   fclose (finput);
 215 #endif
 216 }
 217
 218 void
 219 init_lex ()
 220 {
 221   /* Make identifier nodes long enough for the language-specific slots.  */
 222   set_identifier_size (sizeof (struct lang_identifier));
 223
 224   /* Start it at 0, because check_newline is called at the very beginning
 225      and will increment it to 1.  */
 226   lineno = 0;
 227
 228 #ifdef MULTIBYTE_CHARS
 229   /* Change to the native locale for multibyte conversions.  */
 230   setlocale (LC_CTYPE, "");
 231   literal_codeset = getenv ("LANG");
 232 #endif
 233
 234   maxtoken = 40;
 235   token_buffer = (char *) xmalloc (maxtoken + 2);
 236
 237   ridpointers[(int) RID_INT] = get_identifier ("int");
 238   ridpointers[(int) RID_CHAR] = get_identifier ("char");
 239   ridpointers[(int) RID_VOID] = get_identifier ("void");
 240   ridpointers[(int) RID_FLOAT] = get_identifier ("float");
 241   ridpointers[(int) RID_DOUBLE] = get_identifier ("double");
 242   ridpointers[(int) RID_SHORT] = get_identifier ("short");
 243   ridpointers[(int) RID_LONG] = get_identifier ("long");
 244   ridpointers[(int) RID_UNSIGNED] = get_identifier ("unsigned");
 245   ridpointers[(int) RID_SIGNED] = get_identifier ("signed");
 246   ridpointers[(int) RID_INLINE] = get_identifier ("inline");
 247   ridpointers[(int) RID_CONST] = get_identifier ("const");
 248   ridpointers[(int) RID_VOLATILE] = get_identifier ("volatile");
 249   ridpointers[(int) RID_AUTO] = get_identifier ("auto");
 250   ridpointers[(int) RID_STATIC] = get_identifier ("static");
 251   ridpointers[(int) RID_EXTERN] = get_identifier ("extern");
 252   ridpointers[(int) RID_TYPEDEF] = get_identifier ("typedef");
 253   ridpointers[(int) RID_REGISTER] = get_identifier ("register");
 254   ridpointers[(int) RID_ITERATOR] = get_identifier ("iterator");
 255   ridpointers[(int) RID_COMPLEX] = get_identifier ("complex");
 256   ridpointers[(int) RID_ID] = get_identifier ("id");
 257   ridpointers[(int) RID_IN] = get_identifier ("in");
 258   ridpointers[(int) RID_OUT] = get_identifier ("out");
 259   ridpointers[(int) RID_INOUT] = get_identifier ("inout");
 260   ridpointers[(int) RID_BYCOPY] = get_identifier ("bycopy");
 261   ridpointers[(int) RID_BYREF] = get_identifier ("byref");
 262   ridpointers[(int) RID_ONEWAY] = get_identifier ("oneway");
 263   forget_protocol_qualifiers();
 264
 265   /* Some options inhibit certain reserved words.
 266      Clear those words out of the hash table so they won't be recognized.  */
 267 #define UNSET_RESERVED_WORD(STRING) \
 268   do { struct resword *s = is_reserved_word (STRING, sizeof (STRING) - 1); \
 269        if (s) s->name = ""; } while (0)
 270
 271   if (! doing_objc_thang)
 272     UNSET_RESERVED_WORD ("id");
 273
 274   if (flag_traditional)
 275     {
 276       UNSET_RESERVED_WORD ("const");
 277       UNSET_RESERVED_WORD ("volatile");
 278       UNSET_RESERVED_WORD ("typeof");
 279       UNSET_RESERVED_WORD ("signed");
 280       UNSET_RESERVED_WORD ("inline");
 281       UNSET_RESERVED_WORD ("iterator");
 282       UNSET_RESERVED_WORD ("complex");
 283     }
 284   if (flag_no_asm)
 285     {
 286       UNSET_RESERVED_WORD ("asm");
 287       UNSET_RESERVED_WORD ("typeof");
 288       UNSET_RESERVED_WORD ("inline");
 289       UNSET_RESERVED_WORD ("iterator");
 290       UNSET_RESERVED_WORD ("complex");
 291     }
 292 }
 293
 294 void
 295 reinit_parse_for_function ()
 296 {
 297 }
 298 \f
 299 /* Function used when yydebug is set, to print a token in more detail.  */
 300
 301 void
 302 yyprint (file, yychar, yylval)
 303      FILE *file;
 304      int yychar;
 305      YYSTYPE yylval;
 306 {
 307   tree t;
 308   switch (yychar)
 309     {
 310     case IDENTIFIER:
 311     case TYPENAME:
 312     case OBJECTNAME:
 313       t = yylval.ttype;
 314       if (IDENTIFIER_POINTER (t))
 315         fprintf (file, " `%s'", IDENTIFIER_POINTER (t));
 316       break;
 317
 318     case CONSTANT:
 319       t = yylval.ttype;
 320       if (TREE_CODE (t) == INTEGER_CST)
 321         fprintf (file,
 322 #if HOST_BITS_PER_WIDE_INT == 64
 323 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
 324                  " 0x%x%016x",
 325 #else
 326 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
 327                  " 0x%lx%016lx",
 328 #else
 329                  " 0x%llx%016llx",
 330 #endif
 331 #endif
 332 #else
 333 #if HOST_BITS_PER_WIDE_INT != HOST_BITS_PER_INT
 334                  " 0x%lx%08lx",
 335 #else
 336                  " 0x%x%08x",
 337 #endif
 338 #endif
 339                  TREE_INT_CST_HIGH (t), TREE_INT_CST_LOW (t));
 340       break;
 341     }
 342 }
 343 \f
 344 /* Iff C is a carriage return, warn about it - if appropriate -
 345    and return nonzero.  */
 346 static int
 347 whitespace_cr (c)
 348      int c;
 349 {
 350   static int newline_warning = 0;
 351
 352   if (c == '\r')
 353     {
 354       /* ANSI C says the effects of a carriage return in a source file
 355          are undefined.  */
 356       if (pedantic && !newline_warning)
 357         {
 358           warning ("carriage return in source file");
 359           warning ("(we only warn about the first carriage return)");
 360           newline_warning = 1;
 361         }
 362       return 1;
 363     }
 364   return 0;
 365 }
 366
 367 /* If C is not whitespace, return C.
 368    Otherwise skip whitespace and return first nonwhite char read.  */
 369
 370 static int
 371 skip_white_space (c)
 372      register int c;
 373 {
 374   for (;;)
 375     {
 376       switch (c)
 377         {
 378           /* We don't recognize comments here, because
 379              cpp output can include / and * consecutively as operators.
 380              Also, there's no need, since cpp removes all comments.  */
 381
 382         case '\n':
 383           c = check_newline ();
 384           break;
 385
 386         case ' ':
 387         case '\t':
 388         case '\f':
 389         case '\v':
 390         case '\b':
 391           c = GETC();
 392           break;
 393
 394         case '\r':
 395           whitespace_cr (c);
 396           c = GETC();
 397           break;
 398
 399         case '\\':
 400           c = GETC();
 401           if (c == '\n')
 402             lineno++;
 403           else
 404             error ("stray '\\' in program");
 405           c = GETC();
 406           break;
 407
 408         default:
 409           return (c);
 410         }
 411     }
 412 }
 413
 414 /* Skips all of the white space at the current location in the input file.
 415    Must use and reset nextchar if it has the next character.  */
 416
 417 void
 418 position_after_white_space ()
 419 {
 420   register int c;
 421
 422 #if !USE_CPPLIB
 423   if (nextchar != -1)
 424     c = nextchar, nextchar = -1;
 425   else
 426 #endif
 427     c = GETC();
 428
 429   UNGETC (skip_white_space (c));
 430 }
 431
 432 /* Like skip_white_space, but don't advance beyond the end of line.
 433    Moreover, we don't get passed a character to start with.  */
 434 static int
 435 skip_white_space_on_line ()
 436 {
 437   register int c;
 438
 439   while (1)
 440     {
 441       c = GETC();
 442       switch (c)
 443         {
 444         case '\n':
 445         default:
 446           break;
 447
 448         case ' ':
 449         case '\t':
 450         case '\f':
 451         case '\v':
 452         case '\b':
 453           continue;
 454
 455         case '\r':
 456           whitespace_cr (c);
 457           continue;
 458         }
 459       break;
 460     }
 461   return c;
 462 }
 463
 464 /* Make the token buffer longer, preserving the data in it.
 465    P should point to just beyond the last valid character in the old buffer.
 466    The value we return is a pointer to the new buffer
 467    at a place corresponding to P.  */
 468
 469 static char *
 470 extend_token_buffer (p)
 471      char *p;
 472 {
 473   int offset = p - token_buffer;
 474
 475   maxtoken = maxtoken * 2 + 10;
 476   token_buffer = (char *) xrealloc (token_buffer, maxtoken + 2);
 477
 478   return token_buffer + offset;
 479 }
 480 \f
 481 #if defined HANDLE_PRAGMA
 482 /* Local versions of these macros, that can be passed as function pointers.  */
 483 static int
 484 pragma_getc ()
 485 {
 486   return GETC();
 487 }
 488
 489 static void
 490 pragma_ungetc (arg)
 491      int arg;
 492 {
 493   UNGETC (arg);
 494 }
 495 #endif
 496
 497 /* At the beginning of a line, increment the line number
 498    and process any #-directive on this line.
 499    If the line is a #-directive, read the entire line and return a newline.
 500    Otherwise, return the line's first non-whitespace character.  */
 501
 502 int
 503 check_newline ()
 504 {
 505   register int c;
 506   register int token;
 507
 508   lineno++;
 509
 510   /* Read first nonwhite char on the line.  */
 511
 512   c = GETC();
 513   while (c == ' ' || c == '\t')
 514     c = GETC();
 515
 516   if (c != '#')
 517     {
 518       /* If not #, return it so caller will use it.  */
 519       return c;
 520     }
 521
 522   /* Read first nonwhite char after the `#'.  */
 523
 524   c = GETC();
 525   while (c == ' ' || c == '\t')
 526     c = GETC();
 527
 528   /* If a letter follows, then if the word here is `line', skip
 529      it and ignore it; otherwise, ignore the line, with an error
 530      if the word isn't `pragma', `ident', `define', or `undef'.  */
 531
 532   if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
 533     {
 534       if (c == 'p')
 535         {
 536           if (GETC() == 'r'
 537               && GETC() == 'a'
 538               && GETC() == 'g'
 539               && GETC() == 'm'
 540               && GETC() == 'a'
 541               && ((c = GETC()) == ' ' || c == '\t' || c == '\n'
 542                    || whitespace_cr (c) ))
 543             {
 544               while (c == ' ' || c == '\t' || whitespace_cr (c))
 545                 c = GETC ();
 546               if (c == '\n')
 547                 return c;
 548
 549 #if defined HANDLE_PRAGMA || defined HANDLE_GENERIC_PRAGMAS
 550               UNGETC (c);
 551               token = yylex ();
 552               if (token != IDENTIFIER)
 553                 goto skipline;
 554 #endif /* HANDLE_PRAGMA || HANDLE_GENERIC_PRAGMAS */
 555
 556 #ifdef HANDLE_PRAGMA
 557               /* We invoke HANDLE_PRAGMA before HANDLE_GENERIC_PRAGMAS (if
 558                  both are defined), in order to give the back end a chance to
 559                  override the interpretation of generic style pragmas.  */
 560 #if !USE_CPPLIB
 561               if (nextchar >= 0)
 562                 {
 563                   c = nextchar, nextchar = -1;
 564                   UNGETC (c);
 565                 }
 566 #endif /* !USE_CPPLIB */
 567
 568               if (TREE_CODE (yylval.ttype) != IDENTIFIER_NODE)
 569                 goto skipline;
 570
 571               if (HANDLE_PRAGMA (pragma_getc, pragma_ungetc,
 572                                  IDENTIFIER_POINTER (yylval.ttype)))
 573                 return GETC ();
 574 #endif /* HANDLE_PRAGMA */
 575
 576 #ifdef HANDLE_GENERIC_PRAGMAS
 577               if (handle_generic_pragma (token))
 578                 return GETC ();
 579 #endif /* HANDLE_GENERIC_PRAGMAS */
 580
 581               /* Issue a warning message if we have been asked to do so.
 582                  Ignoring unknown pragmas in system header file unless
 583                  an explcit -Wunknown-pragmas has been given. */
 584               if (warn_unknown_pragmas > 1
 585                   || (warn_unknown_pragmas && ! in_system_header))
 586                 warning ("ignoring pragma: %s", token_buffer);
 587
 588               goto skipline;
 589             }
 590         }
 591
 592       else if (c == 'd')
 593         {
 594           if (GETC() == 'e'
 595               && GETC() == 'f'
 596               && GETC() == 'i'
 597               && GETC() == 'n'
 598               && GETC() == 'e'
 599               && ((c = GETC()) == ' ' || c == '\t' || c == '\n'))
 600             {
 601               if (c != '\n')
 602                 debug_define (lineno, GET_DIRECTIVE_LINE ());
 603               goto skipline;
 604             }
 605         }
 606       else if (c == 'u')
 607         {
 608           if (GETC() == 'n'
 609               && GETC() == 'd'
 610               && GETC() == 'e'
 611               && GETC() == 'f'
 612               && ((c = GETC()) == ' ' || c == '\t' || c == '\n'))
 613             {
 614               if (c != '\n')
 615                 debug_undef (lineno, GET_DIRECTIVE_LINE ());
 616               goto skipline;
 617             }
 618         }
 619       else if (c == 'l')
 620         {
 621           if (GETC() == 'i'
 622               && GETC() == 'n'
 623               && GETC() == 'e'
 624               && ((c = GETC()) == ' ' || c == '\t'))
 625             goto linenum;
 626         }
 627       else if (c == 'i')
 628         {
 629           if (GETC() == 'd'
 630               && GETC() == 'e'
 631               && GETC() == 'n'
 632               && GETC() == 't'
 633               && ((c = GETC()) == ' ' || c == '\t'))
 634             {
 635               /* #ident.  The pedantic warning is now in cccp.c.  */
 636
 637               /* Here we have just seen `#ident '.
 638                  A string constant should follow.  */
 639
 640               c = skip_white_space_on_line ();
 641
 642               /* If no argument, ignore the line.  */
 643               if (c == '\n')
 644                 return c;
 645
 646               UNGETC (c);
 647               token = yylex ();
 648               if (token != STRING
 649                   || TREE_CODE (yylval.ttype) != STRING_CST)
 650                 {
 651                   error ("invalid #ident");
 652                   goto skipline;
 653                 }
 654
 655               if (!flag_no_ident)
 656                 {
 657 #ifdef ASM_OUTPUT_IDENT
 658                   ASM_OUTPUT_IDENT (asm_out_file, TREE_STRING_POINTER (yylval.ttype));
 659 #endif
 660                 }
 661
 662               /* Skip the rest of this line.  */
 663               goto skipline;
 664             }
 665         }
 666
 667       error ("undefined or invalid # directive");
 668       goto skipline;
 669     }
 670
 671 linenum:
 672   /* Here we have either `#line' or `# <nonletter>'.
 673      In either case, it should be a line number; a digit should follow.  */
 674
 675   /* Can't use skip_white_space here, but must handle all whitespace
 676      that is not '\n', lest we get a recursion for '\r' '\n' when
 677      calling yylex.  */
 678   UNGETC (c);
 679   c = skip_white_space_on_line ();
 680
 681   /* If the # is the only nonwhite char on the line,
 682      just ignore it.  Check the new newline.  */
 683   if (c == '\n')
 684     return c;
 685
 686   /* Something follows the #; read a token.  */
 687
 688   UNGETC (c);
 689   token = yylex ();
 690
 691   if (token == CONSTANT
 692       && TREE_CODE (yylval.ttype) == INTEGER_CST)
 693     {
 694       int old_lineno = lineno;
 695       int used_up = 0;
 696       /* subtract one, because it is the following line that
 697          gets the specified number */
 698
 699       int l = TREE_INT_CST_LOW (yylval.ttype) - 1;
 700
 701       /* Is this the last nonwhite stuff on the line?  */
 702       c = skip_white_space_on_line ();
 703       if (c == '\n')
 704         {
 705           /* No more: store the line number and check following line.  */
 706           lineno = l;
 707           return c;
 708         }
 709       UNGETC (c);
 710
 711       /* More follows: it must be a string constant (filename).  */
 712
 713       /* Read the string constant.  */
 714       token = yylex ();
 715
 716       if (token != STRING || TREE_CODE (yylval.ttype) != STRING_CST)
 717         {
 718           error ("invalid #line");
 719           goto skipline;
 720         }
 721
 722       input_filename
 723         = (char *) permalloc (TREE_STRING_LENGTH (yylval.ttype) + 1);
 724       strcpy (input_filename, TREE_STRING_POINTER (yylval.ttype));
 725       lineno = l;
 726
 727       /* Each change of file name
 728          reinitializes whether we are now in a system header.  */
 729       in_system_header = 0;
 730
 731       if (main_input_filename == 0)
 732         main_input_filename = input_filename;
 733
 734       /* Is this the last nonwhite stuff on the line?  */
 735       c = skip_white_space_on_line ();
 736       if (c == '\n')
 737         {
 738           /* Update the name in the top element of input_file_stack.  */
 739           if (input_file_stack)
 740             input_file_stack->name = input_filename;
 741
 742           return c;
 743         }
 744       UNGETC (c);
 745
 746       token = yylex ();
 747       used_up = 0;
 748
 749       /* `1' after file name means entering new file.
 750          `2' after file name means just left a file.  */
 751
 752       if (token == CONSTANT
 753           && TREE_CODE (yylval.ttype) == INTEGER_CST)
 754         {
 755           if (TREE_INT_CST_LOW (yylval.ttype) == 1)
 756             {
 757               /* Pushing to a new file.  */
 758               struct file_stack *p
 759                 = (struct file_stack *) xmalloc (sizeof (struct file_stack));
 760               input_file_stack->line = old_lineno;
 761               p->next = input_file_stack;
 762               p->name = input_filename;
 763               p->indent_level = indent_level;
 764               input_file_stack = p;
 765               input_file_stack_tick++;
 766               debug_start_source_file (input_filename);
 767               used_up = 1;
 768             }
 769           else if (TREE_INT_CST_LOW (yylval.ttype) == 2)
 770             {
 771               /* Popping out of a file.  */
 772               if (input_file_stack->next)
 773                 {
 774                   struct file_stack *p = input_file_stack;
 775                   if (indent_level != p->indent_level)
 776                     {
 777                       warning_with_file_and_line
 778                         (p->name, old_lineno,
 779                          "This file contains more `%c's than `%c's.",
 780                          indent_level > p->indent_level ? '{' : '}',
 781                          indent_level > p->indent_level ? '}' : '{');
 782                     }
 783                   input_file_stack = p->next;
 784                   free (p);
 785                   input_file_stack_tick++;
 786                   debug_end_source_file (input_file_stack->line);
 787                 }
 788               else
 789                 error ("#-lines for entering and leaving files don't match");
 790
 791               used_up = 1;
 792             }
 793         }
 794
 795       /* Now that we've pushed or popped the input stack,
 796          update the name in the top element.  */
 797       if (input_file_stack)
 798         input_file_stack->name = input_filename;
 799
 800       /* If we have handled a `1' or a `2',
 801          see if there is another number to read.  */
 802       if (used_up)
 803         {
 804           /* Is this the last nonwhite stuff on the line?  */
 805           c = skip_white_space_on_line ();
 806           if (c == '\n')
 807             return c;
 808           UNGETC (c);
 809
 810           token = yylex ();
 811           used_up = 0;
 812         }
 813
 814       /* `3' after file name means this is a system header file.  */
 815
 816       if (token == CONSTANT
 817           && TREE_CODE (yylval.ttype) == INTEGER_CST
 818           && TREE_INT_CST_LOW (yylval.ttype) == 3)
 819         in_system_header = 1, used_up = 1;
 820
 821       if (used_up)
 822         {
 823           /* Is this the last nonwhite stuff on the line?  */
 824           c = skip_white_space_on_line ();
 825           if (c == '\n')
 826             return c;
 827           UNGETC (c);
 828         }
 829
 830       warning ("unrecognized text at end of #line");
 831     }
 832   else
 833     error ("invalid #-line");
 834
 835   /* skip the rest of this line.  */
 836  skipline:
 837 #if !USE_CPPLIB
 838   if (c != '\n' && c != EOF && nextchar >= 0)
 839     c = nextchar, nextchar = -1;
 840 #endif
 841   while (c != '\n' && c != EOF)
 842     c = GETC();
 843   return c;
 844 }
 845 \f
 846 #ifdef HANDLE_GENERIC_PRAGMAS
 847
 848 /* Handle a #pragma directive.
 849    TOKEN is the token we read after `#pragma'.  Processes the entire input
 850    line and return non-zero iff the pragma has been successfully parsed.  */
 851
 852 /* This function has to be in this file, in order to get at
 853    the token types.  */
 854
 855 static int
 856 handle_generic_pragma (token)
 857      register int token;
 858 {
 859   register int c;
 860
 861   for (;;)
 862     {
 863       switch (token)
 864         {
 865         case IDENTIFIER:
 866         case TYPENAME:
 867         case STRING:
 868         case CONSTANT:
 869           handle_pragma_token (token_buffer, yylval.ttype);
 870           break;
 871         default:
 872           handle_pragma_token (token_buffer, NULL);
 873         }
 874 #if !USE_CPPLIB
 875       if (nextchar >= 0)
 876         c = nextchar, nextchar = -1;
 877       else
 878 #endif
 879         c = GETC ();
 880
 881       while (c == ' ' || c == '\t')
 882         c = GETC ();
 883       UNGETC (c);
 884
 885       if (c == '\n' || c == EOF)
 886         return handle_pragma_token (NULL, NULL);
 887
 888       token = yylex ();
 889     }
 890 }
 891
 892 #endif /* HANDLE_GENERIC_PRAGMAS */
 893 \f
 894 #define ENDFILE -1  /* token that represents end-of-file */
 895
 896 /* Read an escape sequence, returning its equivalent as a character,
 897    or store 1 in *ignore_ptr if it is backslash-newline.  */
 898
 899 static int
 900 readescape (ignore_ptr)
 901      int *ignore_ptr;
 902 {
 903   register int c = GETC();
 904   register int code;
 905   register unsigned count;
 906   unsigned firstdig = 0;
 907   int nonnull;
 908
 909   switch (c)
 910     {
 911     case 'x':
 912       if (warn_traditional)
 913         warning ("the meaning of `\\x' varies with -traditional");
 914
 915       if (flag_traditional)
 916         return c;
 917
 918       code = 0;
 919       count = 0;
 920       nonnull = 0;
 921       while (1)
 922         {
 923           c = GETC();
 924           if (!(c >= 'a' && c <= 'f')
 925               && !(c >= 'A' && c <= 'F')
 926               && !(c >= '0' && c <= '9'))
 927             {
 928               UNGETC (c);
 929               break;
 930             }
 931           code *= 16;
 932           if (c >= 'a' && c <= 'f')
 933             code += c - 'a' + 10;
 934           if (c >= 'A' && c <= 'F')
 935             code += c - 'A' + 10;
 936           if (c >= '0' && c <= '9')
 937             code += c - '0';
 938           if (code != 0 || count != 0)
 939             {
 940               if (count == 0)
 941                 firstdig = code;
 942               count++;
 943             }
 944           nonnull = 1;
 945         }
 946       if (! nonnull)
 947         error ("\\x used with no following hex digits");
 948       else if (count == 0)
 949         /* Digits are all 0's.  Ok.  */
 950         ;
 951       else if ((count - 1) * 4 >= TYPE_PRECISION (integer_type_node)
 952                || (count > 1
 953                    && (((unsigned)1 << (TYPE_PRECISION (integer_type_node) - (count - 1) * 4))
 954                        <= firstdig)))
 955         pedwarn ("hex escape out of range");
 956       return code;
 957
 958     case '0':  case '1':  case '2':  case '3':  case '4':
 959     case '5':  case '6':  case '7':
 960       code = 0;
 961       count = 0;
 962       while ((c <= '7') && (c >= '0') && (count++ < 3))
 963         {
 964           code = (code * 8) + (c - '0');
 965           c = GETC();
 966         }
 967       UNGETC (c);
 968       return code;
 969
 970     case '\\': case '\'': case '"':
 971       return c;
 972
 973     case '\n':
 974       lineno++;
 975       *ignore_ptr = 1;
 976       return 0;
 977
 978     case 'n':
 979       return TARGET_NEWLINE;
 980
 981     case 't':
 982       return TARGET_TAB;
 983
 984     case 'r':
 985       return TARGET_CR;
 986
 987     case 'f':
 988       return TARGET_FF;
 989
 990     case 'b':
 991       return TARGET_BS;
 992
 993     case 'a':
 994       if (warn_traditional)
 995         warning ("the meaning of `\\a' varies with -traditional");
 996
 997       if (flag_traditional)
 998         return c;
 999       return TARGET_BELL;
1000
1001     case 'v':
1002 #if 0 /* Vertical tab is present in common usage compilers.  */
1003       if (flag_traditional)
1004         return c;
1005 #endif
1006       return TARGET_VT;
1007
1008     case 'e':
1009     case 'E':
1010       if (pedantic)
1011         pedwarn ("non-ANSI-standard escape sequence, `\\%c'", c);
1012       return 033;
1013
1014     case '?':
1015       return c;
1016
1017       /* `\(', etc, are used at beginning of line to avoid confusing Emacs.  */
1018     case '(':
1019     case '{':
1020     case '[':
1021       /* `\%' is used to prevent SCCS from getting confused.  */
1022     case '%':
1023       if (pedantic)
1024         pedwarn ("non-ANSI escape sequence `\\%c'", c);
1025       return c;
1026     }
1027   if (c >= 040 && c < 0177)
1028     pedwarn ("unknown escape sequence `\\%c'", c);
1029   else
1030     pedwarn ("unknown escape sequence: `\\' followed by char code 0x%x", c);
1031   return c;
1032 }
1033 \f
1034 void
1035 yyerror (string)
1036      char *string;
1037 {
1038   char buf[200];
1039
1040   strcpy (buf, string);
1041
1042   /* We can't print string and character constants well
1043      because the token_buffer contains the result of processing escapes.  */
1044   if (end_of_file)
1045     strcat (buf, " at end of input");
1046   else if (token_buffer[0] == 0)
1047     strcat (buf, " at null character");
1048   else if (token_buffer[0] == '"')
1049     strcat (buf, " before string constant");
1050   else if (token_buffer[0] == '\'')
1051     strcat (buf, " before character constant");
1052   else if (token_buffer[0] < 040 || (unsigned char) token_buffer[0] >= 0177)
1053     sprintf (buf + strlen (buf), " before character 0%o",
1054              (unsigned char) token_buffer[0]);
1055   else
1056     strcat (buf, " before `%s'");
1057
1058   error (buf, token_buffer);
1059 }
1060
1061 #if 0
1062
1063 struct try_type
1064 {
1065   tree *node_var;
1066   char unsigned_flag;
1067   char long_flag;
1068   char long_long_flag;
1069 };
1070
1071 struct try_type type_sequence[] =
1072 {
1073   { &integer_type_node, 0, 0, 0},
1074   { &unsigned_type_node, 1, 0, 0},
1075   { &long_integer_type_node, 0, 1, 0},
1076   { &long_unsigned_type_node, 1, 1, 0},
1077   { &long_long_integer_type_node, 0, 1, 1},
1078   { &long_long_unsigned_type_node, 1, 1, 1}
1079 };
1080 #endif /* 0 */
1081 \f
1082 int
1083 yylex ()
1084 {
1085   register int c;
1086   register char *p;
1087   register int value;
1088   int wide_flag = 0;
1089   int objc_flag = 0;
1090
1091 #if !USE_CPPLIB
1092   if (nextchar >= 0)
1093     c = nextchar, nextchar = -1;
1094   else
1095 #endif
1096     c = GETC();
1097
1098   /* Effectively do c = skip_white_space (c)
1099      but do it faster in the usual cases.  */
1100   while (1)
1101     switch (c)
1102       {
1103       case ' ':
1104       case '\t':
1105       case '\f':
1106       case '\v':
1107       case '\b':
1108         c = GETC();
1109         break;
1110
1111       case '\r':
1112         /* Call skip_white_space so we can warn if appropriate.  */
1113
1114       case '\n':
1115       case '/':
1116       case '\\':
1117         c = skip_white_space (c);
1118       default:
1119         goto found_nonwhite;
1120       }
1121  found_nonwhite:
1122
1123   token_buffer[0] = c;
1124   token_buffer[1] = 0;
1125
1126 /*  yylloc.first_line = lineno; */
1127
1128   switch (c)
1129     {
1130     case EOF:
1131       end_of_file = 1;
1132       token_buffer[0] = 0;
1133       value = ENDFILE;
1134       break;
1135
1136     case 'L':
1137       /* Capital L may start a wide-string or wide-character constant.  */
1138       {
1139         register int c = GETC();
1140         if (c == '\'')
1141           {
1142             wide_flag = 1;
1143             goto char_constant;
1144           }
1145         if (c == '"')
1146           {
1147             wide_flag = 1;
1148             goto string_constant;
1149           }
1150         UNGETC (c);
1151       }
1152       goto letter;
1153
1154     case '@':
1155       if (!doing_objc_thang)
1156         {
1157           value = c;
1158           break;
1159         }
1160       else
1161         {
1162           /* '@' may start a constant string object.  */
1163           register int c = GETC ();
1164           if (c == '"')
1165             {
1166               objc_flag = 1;
1167               goto string_constant;
1168             }
1169           UNGETC (c);
1170           /* Fall through to treat '@' as the start of an identifier.  */
1171         }
1172
1173     case 'A':  case 'B':  case 'C':  case 'D':  case 'E':
1174     case 'F':  case 'G':  case 'H':  case 'I':  case 'J':
1175     case 'K':             case 'M':  case 'N':  case 'O':
1176     case 'P':  case 'Q':  case 'R':  case 'S':  case 'T':
1177     case 'U':  case 'V':  case 'W':  case 'X':  case 'Y':
1178     case 'Z':
1179     case 'a':  case 'b':  case 'c':  case 'd':  case 'e':
1180     case 'f':  case 'g':  case 'h':  case 'i':  case 'j':
1181     case 'k':  case 'l':  case 'm':  case 'n':  case 'o':
1182     case 'p':  case 'q':  case 'r':  case 's':  case 't':
1183     case 'u':  case 'v':  case 'w':  case 'x':  case 'y':
1184     case 'z':
1185     case '_':
1186     case '$':
1187     letter:
1188       p = token_buffer;
1189       while (ISALNUM (c) || c == '_' || c == '$' || c == '@')
1190         {
1191           /* Make sure this char really belongs in an identifier.  */
1192           if (c == '@' && ! doing_objc_thang)
1193             break;
1194           if (c == '$')
1195             {
1196               if (! dollars_in_ident)
1197                 error ("`$' in identifier");
1198               else if (pedantic)
1199                 pedwarn ("`$' in identifier");
1200             }
1201
1202           if (p >= token_buffer + maxtoken)
1203             p = extend_token_buffer (p);
1204
1205           *p++ = c;
1206           c = GETC();
1207         }
1208
1209       *p = 0;
1210 #if USE_CPPLIB
1211       UNGETC (c);
1212 #else
1213       nextchar = c;
1214 #endif
1215
1216       value = IDENTIFIER;
1217       yylval.itype = 0;
1218
1219       /* Try to recognize a keyword.  Uses minimum-perfect hash function */
1220
1221       {
1222         register struct resword *ptr;
1223
1224         if ((ptr = is_reserved_word (token_buffer, p - token_buffer)))
1225           {
1226             if (ptr->rid)
1227               yylval.ttype = ridpointers[(int) ptr->rid];
1228             value = (int) ptr->token;
1229
1230             /* Only return OBJECTNAME if it is a typedef.  */
1231             if (doing_objc_thang && value == OBJECTNAME)
1232               {
1233                 lastiddecl = lookup_name(yylval.ttype);
1234
1235                 if (lastiddecl == NULL_TREE
1236                     || TREE_CODE (lastiddecl) != TYPE_DECL)
1237                   value = IDENTIFIER;
1238               }
1239
1240             /* Even if we decided to recognize asm, still perhaps warn.  */
1241             if (pedantic
1242                 && (value == ASM_KEYWORD || value == TYPEOF
1243                     || ptr->rid == RID_INLINE)
1244                 && token_buffer[0] != '_')
1245               pedwarn ("ANSI does not permit the keyword `%s'",
1246                        token_buffer);
1247           }
1248       }
1249
1250       /* If we did not find a keyword, look for an identifier
1251          (or a typename).  */
1252
1253       if (value == IDENTIFIER)
1254         {
1255           if (token_buffer[0] == '@')
1256             error("invalid identifier `%s'", token_buffer);
1257
1258           yylval.ttype = get_identifier (token_buffer);
1259           lastiddecl = lookup_name (yylval.ttype);
1260
1261           if (lastiddecl != 0 && TREE_CODE (lastiddecl) == TYPE_DECL)
1262             value = TYPENAME;
1263           /* A user-invisible read-only initialized variable
1264              should be replaced by its value.
1265              We handle only strings since that's the only case used in C.  */
1266           else if (lastiddecl != 0 && TREE_CODE (lastiddecl) == VAR_DECL
1267                    && DECL_IGNORED_P (lastiddecl)
1268                    && TREE_READONLY (lastiddecl)
1269                    && DECL_INITIAL (lastiddecl) != 0
1270                    && TREE_CODE (DECL_INITIAL (lastiddecl)) == STRING_CST)
1271             {
1272               tree stringval = DECL_INITIAL (lastiddecl);
1273
1274               /* Copy the string value so that we won't clobber anything
1275                  if we put something in the TREE_CHAIN of this one.  */
1276               yylval.ttype = build_string (TREE_STRING_LENGTH (stringval),
1277                                            TREE_STRING_POINTER (stringval));
1278               value = STRING;
1279             }
1280           else if (doing_objc_thang)
1281             {
1282               tree objc_interface_decl = is_class_name (yylval.ttype);
1283
1284               if (objc_interface_decl)
1285                 {
1286                   value = CLASSNAME;
1287                   yylval.ttype = objc_interface_decl;
1288                 }
1289             }
1290         }
1291
1292       break;
1293
1294     case '0':  case '1':
1295       {
1296         int next_c;
1297         /* Check first for common special case:  single-digit 0 or 1.  */
1298
1299         next_c = GETC ();
1300         UNGETC (next_c);        /* Always undo this lookahead.  */
1301         if (!ISALNUM (next_c) && next_c != '.')
1302           {
1303             token_buffer[0] = (char)c,  token_buffer[1] = '\0';
1304             yylval.ttype = (c == '0') ? integer_zero_node : integer_one_node;
1305             value = CONSTANT;
1306             break;
1307           }
1308         /*FALLTHRU*/
1309       }
1310     case '2':  case '3':  case '4':
1311     case '5':  case '6':  case '7':  case '8':  case '9':
1312     case '.':
1313       {
1314         int base = 10;
1315         int count = 0;
1316         int largest_digit = 0;
1317         int numdigits = 0;
1318         /* for multi-precision arithmetic,
1319            we actually store only HOST_BITS_PER_CHAR bits in each part.
1320            The number of parts is chosen so as to be sufficient to hold
1321            the enough bits to fit into the two HOST_WIDE_INTs that contain
1322            the integer value (this is always at least as many bits as are
1323            in a target `long long' value, but may be wider).  */
1324 #define TOTAL_PARTS ((HOST_BITS_PER_WIDE_INT / HOST_BITS_PER_CHAR) * 2 + 2)
1325         int parts[TOTAL_PARTS];
1326         int overflow = 0;
1327
1328         enum anon1 { NOT_FLOAT, AFTER_POINT, TOO_MANY_POINTS} floatflag
1329           = NOT_FLOAT;
1330
1331         for (count = 0; count < TOTAL_PARTS; count++)
1332           parts[count] = 0;
1333
1334         p = token_buffer;
1335         *p++ = c;
1336
1337         if (c == '0')
1338           {
1339             *p++ = (c = GETC());
1340             if ((c == 'x') || (c == 'X'))
1341               {
1342                 base = 16;
1343                 *p++ = (c = GETC());
1344               }
1345             /* Leading 0 forces octal unless the 0 is the only digit.  */
1346             else if (c >= '0' && c <= '9')
1347               {
1348                 base = 8;
1349                 numdigits++;
1350               }
1351             else
1352               numdigits++;
1353           }
1354
1355         /* Read all the digits-and-decimal-points.  */
1356
1357         while (c == '.'
1358                || (ISALNUM (c) && c != 'l' && c != 'L'
1359                    && c != 'u' && c != 'U'
1360                    && c != 'i' && c != 'I' && c != 'j' && c != 'J'
1361                    && (floatflag == NOT_FLOAT || ((c != 'f') && (c != 'F')))))
1362           {
1363             if (c == '.')
1364               {
1365                 if (base == 16)
1366                   error ("floating constant may not be in radix 16");
1367                 if (floatflag == TOO_MANY_POINTS)
1368                   /* We have already emitted an error.  Don't need another.  */
1369                   ;
1370                 else if (floatflag == AFTER_POINT)
1371                   {
1372                     error ("malformed floating constant");
1373                     floatflag = TOO_MANY_POINTS;
1374                     /* Avoid another error from atof by forcing all characters
1375                        from here on to be ignored.  */
1376                     p[-1] = '\0';
1377                   }
1378                 else
1379                   floatflag = AFTER_POINT;
1380
1381                 base = 10;
1382                 *p++ = c = GETC();
1383                 /* Accept '.' as the start of a floating-point number
1384                    only when it is followed by a digit.
1385                    Otherwise, unread the following non-digit
1386                    and use the '.' as a structural token.  */
1387                 if (p == token_buffer + 2 && !ISDIGIT (c))
1388                   {
1389                     if (c == '.')
1390                       {
1391                         c = GETC();
1392                         if (c == '.')
1393                           {
1394                             *p++ = c;
1395                             *p = 0;
1396                             return ELLIPSIS;
1397                           }
1398                         error ("parse error at `..'");
1399                       }
1400                     UNGETC (c);
1401                     token_buffer[1] = 0;
1402                     value = '.';
1403                     goto done;
1404                   }
1405               }
1406             else
1407               {
1408                 /* It is not a decimal point.
1409                    It should be a digit (perhaps a hex digit).  */
1410
1411                 if (ISDIGIT (c))
1412                   {
1413                     c = c - '0';
1414                   }
1415                 else if (base <= 10)
1416                   {
1417                     if (c == 'e' || c == 'E')
1418                       {
1419                         base = 10;
1420                         floatflag = AFTER_POINT;
1421                         break;   /* start of exponent */
1422                       }
1423                     error ("nondigits in number and not hexadecimal");
1424                     c = 0;
1425                   }
1426                 else if (c >= 'a')
1427                   {
1428                     c = c - 'a' + 10;
1429                   }
1430                 else
1431                   {
1432                     c = c - 'A' + 10;
1433                   }
1434                 if (c >= largest_digit)
1435                   largest_digit = c;
1436                 numdigits++;
1437
1438                 for (count = 0; count < TOTAL_PARTS; count++)
1439                   {
1440                     parts[count] *= base;
1441                     if (count)
1442                       {
1443                         parts[count]
1444                           += (parts[count-1] >> HOST_BITS_PER_CHAR);
1445                         parts[count-1]
1446                           &= (1 << HOST_BITS_PER_CHAR) - 1;
1447                       }
1448                     else
1449                       parts[0] += c;
1450                   }
1451
1452                 /* If the extra highest-order part ever gets anything in it,
1453                    the number is certainly too big.  */
1454                 if (parts[TOTAL_PARTS - 1] != 0)
1455                   overflow = 1;
1456
1457                 if (p >= token_buffer + maxtoken - 3)
1458                   p = extend_token_buffer (p);
1459                 *p++ = (c = GETC());
1460               }
1461           }
1462
1463         if (numdigits == 0)
1464           error ("numeric constant with no digits");
1465
1466         if (largest_digit >= base)
1467           error ("numeric constant contains digits beyond the radix");
1468
1469         /* Remove terminating char from the token buffer and delimit the string */
1470         *--p = 0;
1471
1472         if (floatflag != NOT_FLOAT)
1473           {
1474             tree type = double_type_node;
1475             int imag = 0;
1476             int conversion_errno = 0;
1477             REAL_VALUE_TYPE value;
1478             jmp_buf handler;
1479
1480             /* Read explicit exponent if any, and put it in tokenbuf.  */
1481
1482             if ((c == 'e') || (c == 'E'))
1483               {
1484                 if (p >= token_buffer + maxtoken - 3)
1485                   p = extend_token_buffer (p);
1486                 *p++ = c;
1487                 c = GETC();
1488                 if ((c == '+') || (c == '-'))
1489                   {
1490                     *p++ = c;
1491                     c = GETC();
1492                   }
1493                 if (! ISDIGIT (c))
1494                   error ("floating constant exponent has no digits");
1495                 while (ISDIGIT (c))
1496                   {
1497                     if (p >= token_buffer + maxtoken - 3)
1498                       p = extend_token_buffer (p);
1499                     *p++ = c;
1500                     c = GETC();
1501                   }
1502               }
1503
1504             *p = 0;
1505
1506             /* Convert string to a double, checking for overflow.  */
1507             if (setjmp (handler))
1508               {
1509                 error ("floating constant out of range");
1510                 value = dconst0;
1511               }
1512             else
1513               {
1514                 int fflag = 0, lflag = 0;
1515                 /* Copy token_buffer now, while it has just the number
1516                    and not the suffixes; once we add `f' or `i',
1517                    REAL_VALUE_ATOF may not work any more.  */
1518                 char *copy = (char *) alloca (p - token_buffer + 1);
1519                 bcopy (token_buffer, copy, p - token_buffer + 1);
1520
1521                 set_float_handler (handler);
1522
1523                 while (1)
1524                   {
1525                     int lose = 0;
1526
1527                     /* Read the suffixes to choose a data type.  */
1528                     switch (c)
1529                       {
1530                       case 'f': case 'F':
1531                         if (fflag)
1532                           error ("more than one `f' in numeric constant");
1533                         fflag = 1;
1534                         break;
1535
1536                       case 'l': case 'L':
1537                         if (lflag)
1538                           error ("more than one `l' in numeric constant");
1539                         lflag = 1;
1540                         break;
1541
1542                       case 'i': case 'I':
1543                         if (imag)
1544                           error ("more than one `i' or `j' in numeric constant");
1545                         else if (pedantic)
1546                           pedwarn ("ANSI C forbids imaginary numeric constants");
1547                         imag = 1;
1548                         break;
1549
1550                       default:
1551                         lose = 1;
1552                       }
1553
1554                     if (lose)
1555                       break;
1556
1557                     if (p >= token_buffer + maxtoken - 3)
1558                       p = extend_token_buffer (p);
1559                     *p++ = c;
1560                     *p = 0;
1561                     c = GETC();
1562                   }
1563
1564                 /* The second argument, machine_mode, of REAL_VALUE_ATOF
1565                    tells the desired precision of the binary result
1566                    of decimal-to-binary conversion.  */
1567
1568                 if (fflag)
1569                   {
1570                     if (lflag)
1571                       error ("both `f' and `l' in floating constant");
1572
1573                     type = float_type_node;
1574                     errno = 0;
1575                     value = REAL_VALUE_ATOF (copy, TYPE_MODE (type));
1576                     conversion_errno = errno;
1577                     /* A diagnostic is required here by some ANSI C testsuites.
1578                        This is not pedwarn, become some people don't want
1579                        an error for this.  */
1580                     if (REAL_VALUE_ISINF (value) && pedantic)
1581                       warning ("floating point number exceeds range of `float'");
1582                   }
1583                 else if (lflag)
1584                   {
1585                     type = long_double_type_node;
1586                     errno = 0;
1587                     value = REAL_VALUE_ATOF (copy, TYPE_MODE (type));
1588                     conversion_errno = errno;
1589                     if (REAL_VALUE_ISINF (value) && pedantic)
1590                       warning ("floating point number exceeds range of `long double'");
1591                   }
1592                 else
1593                   {
1594                     errno = 0;
1595                     value = REAL_VALUE_ATOF (copy, TYPE_MODE (type));
1596                     conversion_errno = errno;
1597                     if (REAL_VALUE_ISINF (value) && pedantic)
1598                       warning ("floating point number exceeds range of `double'");
1599                   }
1600
1601                 set_float_handler (NULL_PTR);
1602             }
1603 #ifdef ERANGE
1604             /* ERANGE is also reported for underflow,
1605                so test the value to distinguish overflow from that.  */
1606             if (conversion_errno == ERANGE && !flag_traditional && pedantic
1607                 && (REAL_VALUES_LESS (dconst1, value)
1608                     || REAL_VALUES_LESS (value, dconstm1)))
1609               warning ("floating point number exceeds range of `double'");
1610 #endif
1611
1612             /* If the result is not a number, assume it must have been
1613                due to some error message above, so silently convert
1614                it to a zero.  */
1615             if (REAL_VALUE_ISNAN (value))
1616               value = dconst0;
1617
1618             /* Create a node with determined type and value.  */
1619             if (imag)
1620               yylval.ttype = build_complex (NULL_TREE,
1621                                             convert (type, integer_zero_node),
1622                                             build_real (type, value));
1623             else
1624               yylval.ttype = build_real (type, value);
1625           }
1626         else
1627           {
1628             tree traditional_type, ansi_type, type;
1629             HOST_WIDE_INT high, low;
1630             int spec_unsigned = 0;
1631             int spec_long = 0;
1632             int spec_long_long = 0;
1633             int spec_imag = 0;
1634             int bytes, warn, i;
1635
1636             traditional_type = ansi_type = type = NULL_TREE;
1637             while (1)
1638               {
1639                 if (c == 'u' || c == 'U')
1640                   {
1641                     if (spec_unsigned)
1642                       error ("two `u's in integer constant");
1643                     spec_unsigned = 1;
1644                   }
1645                 else if (c == 'l' || c == 'L')
1646                   {
1647                     if (spec_long)
1648                       {
1649                         if (spec_long_long)
1650                           error ("three `l's in integer constant");
1651                         else if (pedantic && ! in_system_header && warn_long_long)
1652                           pedwarn ("ANSI C forbids long long integer constants");
1653                         spec_long_long = 1;
1654                       }
1655                     spec_long = 1;
1656                   }
1657                 else if (c == 'i' || c == 'j' || c == 'I' || c == 'J')
1658                   {
1659                     if (spec_imag)
1660                       error ("more than one `i' or `j' in numeric constant");
1661                     else if (pedantic)
1662                       pedwarn ("ANSI C forbids imaginary numeric constants");
1663                     spec_imag = 1;
1664                   }
1665                 else
1666                   break;
1667                 if (p >= token_buffer + maxtoken - 3)
1668                   p = extend_token_buffer (p);
1669                 *p++ = c;
1670                 c = GETC();
1671               }
1672
1673             /* If the constant won't fit in an unsigned long long,
1674                then warn that the constant is out of range.  */
1675
1676             /* ??? This assumes that long long and long integer types are
1677                a multiple of 8 bits.  This better than the original code
1678                though which assumed that long was exactly 32 bits and long
1679                long was exactly 64 bits.  */
1680
1681             bytes = TYPE_PRECISION (long_long_integer_type_node) / 8;
1682
1683             warn = overflow;
1684             for (i = bytes; i < TOTAL_PARTS; i++)
1685               if (parts[i])
1686                 warn = 1;
1687             if (warn)
1688               pedwarn ("integer constant out of range");
1689
1690             /* This is simplified by the fact that our constant
1691                is always positive.  */
1692
1693             high = low = 0;
1694
1695             for (i = 0; i < HOST_BITS_PER_WIDE_INT / HOST_BITS_PER_CHAR; i++)
1696               {
1697                 high |= ((HOST_WIDE_INT) parts[i + (HOST_BITS_PER_WIDE_INT
1698                                                     / HOST_BITS_PER_CHAR)]
1699                          << (i * HOST_BITS_PER_CHAR));
1700                 low |= (HOST_WIDE_INT) parts[i] << (i * HOST_BITS_PER_CHAR);
1701               }
1702
1703             yylval.ttype = build_int_2 (low, high);
1704             TREE_TYPE (yylval.ttype) = long_long_unsigned_type_node;
1705
1706             /* If warn_traditional, calculate both the ANSI type and the
1707                traditional type, then see if they disagree.
1708                Otherwise, calculate only the type for the dialect in use.  */
1709             if (warn_traditional || flag_traditional)
1710               {
1711                 /* Calculate the traditional type.  */
1712                 /* Traditionally, any constant is signed;
1713                    but if unsigned is specified explicitly, obey that.
1714                    Use the smallest size with the right number of bits,
1715                    except for one special case with decimal constants.  */
1716                 if (! spec_long && base != 10
1717                     && int_fits_type_p (yylval.ttype, unsigned_type_node))
1718                   traditional_type = (spec_unsigned ? unsigned_type_node
1719                                       : integer_type_node);
1720                 /* A decimal constant must be long
1721                    if it does not fit in type int.
1722                    I think this is independent of whether
1723                    the constant is signed.  */
1724                 else if (! spec_long && base == 10
1725                          && int_fits_type_p (yylval.ttype, integer_type_node))
1726                   traditional_type = (spec_unsigned ? unsigned_type_node
1727                                       : integer_type_node);
1728                 else if (! spec_long_long)
1729                   traditional_type = (spec_unsigned ? long_unsigned_type_node
1730                                       : long_integer_type_node);
1731                 else
1732                   traditional_type = (spec_unsigned
1733                                       ? long_long_unsigned_type_node
1734                                       : long_long_integer_type_node);
1735               }
1736             if (warn_traditional || ! flag_traditional)
1737               {
1738                 /* Calculate the ANSI type.  */
1739                 if (! spec_long && ! spec_unsigned
1740                     && int_fits_type_p (yylval.ttype, integer_type_node))
1741                   ansi_type = integer_type_node;
1742                 else if (! spec_long && (base != 10 || spec_unsigned)
1743                          && int_fits_type_p (yylval.ttype, unsigned_type_node))
1744                   ansi_type = unsigned_type_node;
1745                 else if (! spec_unsigned && !spec_long_long
1746                          && int_fits_type_p (yylval.ttype, long_integer_type_node))
1747                   ansi_type = long_integer_type_node;
1748                 else if (! spec_long_long
1749                          && int_fits_type_p (yylval.ttype,
1750                                              long_unsigned_type_node))
1751                   ansi_type = long_unsigned_type_node;
1752                 else if (! spec_unsigned
1753                          && int_fits_type_p (yylval.ttype,
1754                                              long_long_integer_type_node))
1755                   ansi_type = long_long_integer_type_node;
1756                 else
1757                   ansi_type = long_long_unsigned_type_node;
1758               }
1759
1760             type = flag_traditional ? traditional_type : ansi_type;
1761
1762             if (warn_traditional && traditional_type != ansi_type)
1763               {
1764                 if (TYPE_PRECISION (traditional_type)
1765                     != TYPE_PRECISION (ansi_type))
1766                   warning ("width of integer constant changes with -traditional");
1767                 else if (TREE_UNSIGNED (traditional_type)
1768                          != TREE_UNSIGNED (ansi_type))
1769                   warning ("integer constant is unsigned in ANSI C, signed with -traditional");
1770                 else
1771                   warning ("width of integer constant may change on other systems with -traditional");
1772               }
1773
1774             if (pedantic && !flag_traditional && !spec_long_long && !warn
1775                 && (TYPE_PRECISION (long_integer_type_node)
1776                     < TYPE_PRECISION (type)))
1777               pedwarn ("integer constant out of range");
1778
1779             if (base == 10 && ! spec_unsigned && TREE_UNSIGNED (type))
1780               warning ("decimal constant is so large that it is unsigned");
1781
1782             if (spec_imag)
1783               {
1784                 if (TYPE_PRECISION (type)
1785                     <= TYPE_PRECISION (integer_type_node))
1786                   yylval.ttype
1787                     = build_complex (NULL_TREE, integer_zero_node,
1788                                      convert (integer_type_node,
1789                                               yylval.ttype));
1790                 else
1791                   error ("complex integer constant is too wide for `complex int'");
1792               }
1793             else if (flag_traditional && !int_fits_type_p (yylval.ttype, type))
1794               /* The traditional constant 0x80000000 is signed
1795                  but doesn't fit in the range of int.
1796                  This will change it to -0x80000000, which does fit.  */
1797               {
1798                 TREE_TYPE (yylval.ttype) = unsigned_type (type);
1799                 yylval.ttype = convert (type, yylval.ttype);
1800                 TREE_OVERFLOW (yylval.ttype)
1801                   = TREE_CONSTANT_OVERFLOW (yylval.ttype) = 0;
1802               }
1803             else
1804               TREE_TYPE (yylval.ttype) = type;
1805           }
1806
1807         UNGETC (c);
1808         *p = 0;
1809
1810         if (ISALNUM (c) || c == '.' || c == '_' || c == '$'
1811             || (!flag_traditional && (c == '-' || c == '+')
1812                 && (p[-1] == 'e' || p[-1] == 'E')))
1813           error ("missing white space after number `%s'", token_buffer);
1814
1815         value = CONSTANT; break;
1816       }
1817
1818     case '\'':
1819     char_constant:
1820       {
1821         register int result = 0;
1822         register int num_chars = 0;
1823         int chars_seen = 0;
1824         unsigned width = TYPE_PRECISION (char_type_node);
1825         int max_chars;
1826 #ifdef MULTIBYTE_CHARS
1827         int longest_char = local_mb_cur_max ();
1828         (void) local_mbtowc (NULL_PTR, NULL_PTR, 0);
1829 #endif
1830
1831         max_chars = TYPE_PRECISION (integer_type_node) / width;
1832         if (wide_flag)
1833           width = WCHAR_TYPE_SIZE;
1834
1835         while (1)
1836           {
1837           tryagain:
1838             c = GETC();
1839
1840             if (c == '\'' || c == EOF)
1841               break;
1842
1843             ++chars_seen;
1844             if (c == '\\')
1845               {
1846                 int ignore = 0;
1847                 c = readescape (&ignore);
1848                 if (ignore)
1849                   goto tryagain;
1850                 if (width < HOST_BITS_PER_INT
1851                     && (unsigned) c >= ((unsigned)1 << width))
1852                   pedwarn ("escape sequence out of range for character");
1853 #ifdef MAP_CHARACTER
1854                 if (ISPRINT (c))
1855                   c = MAP_CHARACTER (c);
1856 #endif
1857               }
1858             else if (c == '\n')
1859               {
1860                 if (pedantic)
1861                   pedwarn ("ANSI C forbids newline in character constant");
1862                 lineno++;
1863               }
1864             else
1865               {
1866 #ifdef MULTIBYTE_CHARS
1867                 wchar_t wc;
1868                 int i;
1869                 int char_len = -1;
1870                 for (i = 1; i <= longest_char; ++i)
1871                   {
1872                     if (i > maxtoken - 4)
1873                       extend_token_buffer (token_buffer);
1874
1875                     token_buffer[i] = c;
1876                     char_len = local_mbtowc (& wc,
1877                                              token_buffer + 1,
1878                                              i);
1879                     if (char_len != -1)
1880                       break;
1881                     c = GETC ();
1882                   }
1883                 if (char_len > 1)
1884                   {
1885                     /* mbtowc sometimes needs an extra char before accepting */
1886                     if (char_len < i)
1887                       UNGETC (c);
1888                     if (! wide_flag)
1889                       {
1890                         /* Merge character into result; ignore excess chars.  */
1891                         for (i = 1; i <= char_len; ++i)
1892                           {
1893                             if (i > max_chars)
1894                               break;
1895                             if (width < HOST_BITS_PER_INT)
1896                               result = (result << width)
1897                                 | (token_buffer[i]
1898                                    & ((1 << width) - 1));
1899                             else
1900                               result = token_buffer[i];
1901                           }
1902                         num_chars += char_len;
1903                         goto tryagain;
1904                       }
1905                     c = wc;
1906                   }
1907                 else
1908                   {
1909                     if (char_len == -1)
1910                       warning ("Ignoring invalid multibyte character");
1911                     if (wide_flag)
1912                       c = wc;
1913 #ifdef MAP_CHARACTER
1914                     else
1915                       c = MAP_CHARACTER (c);
1916 #endif
1917                   }
1918 #else /* ! MULTIBYTE_CHARS */
1919 #ifdef MAP_CHARACTER
1920                 c = MAP_CHARACTER (c);
1921 #endif
1922 #endif /* ! MULTIBYTE_CHARS */
1923               }
1924
1925             if (wide_flag)
1926               {
1927                 if (chars_seen == 1) /* only keep the first one */
1928                   result = c;
1929                 goto tryagain;
1930               }
1931
1932             /* Merge character into result; ignore excess chars.  */
1933             num_chars += (width / TYPE_PRECISION (char_type_node));
1934             if (num_chars < max_chars + 1)
1935               {
1936                 if (width < HOST_BITS_PER_INT)
1937                   result = (result << width) | (c & ((1 << width) - 1));
1938                 else
1939                   result = c;
1940               }
1941           }
1942
1943         if (c != '\'')
1944           error ("malformatted character constant");
1945         else if (chars_seen == 0)
1946           error ("empty character constant");
1947         else if (num_chars > max_chars)
1948           {
1949             num_chars = max_chars;
1950             error ("character constant too long");
1951           }
1952         else if (chars_seen != 1 && ! flag_traditional && warn_multichar)
1953           warning ("multi-character character constant");
1954
1955         /* If char type is signed, sign-extend the constant.  */
1956         if (! wide_flag)
1957           {
1958             int num_bits = num_chars * width;
1959             if (num_bits == 0)
1960               /* We already got an error; avoid invalid shift.  */
1961               yylval.ttype = build_int_2 (0, 0);
1962             else if (TREE_UNSIGNED (char_type_node)
1963                      || ((result >> (num_bits - 1)) & 1) == 0)
1964               yylval.ttype
1965                 = build_int_2 (result & (~(unsigned HOST_WIDE_INT) 0
1966                                          >> (HOST_BITS_PER_WIDE_INT - num_bits)),
1967                                0);
1968             else
1969               yylval.ttype
1970                 = build_int_2 (result | ~(~(unsigned HOST_WIDE_INT) 0
1971                                           >> (HOST_BITS_PER_WIDE_INT - num_bits)),
1972                                -1);
1973             TREE_TYPE (yylval.ttype) = integer_type_node;
1974           }
1975         else
1976           {
1977             yylval.ttype = build_int_2 (result, 0);
1978             TREE_TYPE (yylval.ttype) = wchar_type_node;
1979           }
1980
1981         value = CONSTANT;
1982         break;
1983       }
1984
1985     case '"':
1986     string_constant:
1987       {
1988         unsigned width = wide_flag ? WCHAR_TYPE_SIZE
1989                                    : TYPE_PRECISION (char_type_node);
1990 #ifdef MULTIBYTE_CHARS
1991         int longest_char = local_mb_cur_max ();
1992         (void) local_mbtowc (NULL_PTR, NULL_PTR, 0);
1993 #endif
1994         c = GETC ();
1995         p = token_buffer + 1;
1996
1997         while (c != '"' && c >= 0)
1998           {
1999             if (c == '\\')
2000               {
2001                 int ignore = 0;
2002                 c = readescape (&ignore);
2003                 if (ignore)
2004                   goto skipnewline;
2005                 if (width < HOST_BITS_PER_INT
2006                     && (unsigned) c >= ((unsigned)1 << width))
2007                   pedwarn ("escape sequence out of range for character");
2008               }
2009             else if (c == '\n')
2010               {
2011                 if (pedantic)
2012                   pedwarn ("ANSI C forbids newline in string constant");
2013                 lineno++;
2014               }
2015             else
2016               {
2017 #ifdef MULTIBYTE_CHARS
2018                 wchar_t wc;
2019                 int i;
2020                 int char_len = -1;
2021                 for (i = 0; i < longest_char; ++i)
2022                   {
2023                     if (p + i >= token_buffer + maxtoken)
2024                       p = extend_token_buffer (p);
2025                     p[i] = c;
2026
2027                     char_len = local_mbtowc (& wc, p, i + 1);
2028                     if (char_len != -1)
2029                       break;
2030                     c = GETC ();
2031                   }
2032                 if (char_len == -1)
2033                   warning ("Ignoring invalid multibyte character");
2034                 else
2035                   {
2036                     /* mbtowc sometimes needs an extra char before accepting */
2037                     if (char_len <= i)
2038                       UNGETC (c);
2039                     if (wide_flag)
2040                       {
2041                         *(wchar_t *)p = wc;
2042                         p += sizeof (wc);
2043                       }
2044                     else
2045                       p += (i + 1);
2046                     c = GETC ();
2047                     continue;
2048                   }
2049 #endif /* MULTIBYTE_CHARS */
2050               }
2051
2052             /* Add this single character into the buffer either as a wchar_t
2053                or as a single byte.  */
2054             if (wide_flag)
2055               {
2056                 unsigned width = TYPE_PRECISION (char_type_node);
2057                 unsigned bytemask = (1 << width) - 1;
2058                 int byte;
2059
2060                 if (p + WCHAR_BYTES > token_buffer + maxtoken)
2061                   p = extend_token_buffer (p);
2062
2063                 for (byte = 0; byte < WCHAR_BYTES; ++byte)
2064                   {
2065                     int value;
2066                     if (byte >= (int) sizeof (c))
2067                       value = 0;
2068                     else
2069                       value = (c >> (byte * width)) & bytemask;
2070                     if (BYTES_BIG_ENDIAN)
2071                       p[WCHAR_BYTES - byte - 1] = value;
2072                     else
2073                       p[byte] = value;
2074                   }
2075                 p += WCHAR_BYTES;
2076               }
2077             else
2078               {
2079                 if (p >= token_buffer + maxtoken)
2080                   p = extend_token_buffer (p);
2081                 *p++ = c;
2082               }
2083
2084           skipnewline:
2085             c = GETC ();
2086           }
2087
2088         /* Terminate the string value, either with a single byte zero
2089            or with a wide zero.  */
2090         if (wide_flag)
2091           {
2092             if (p + WCHAR_BYTES > token_buffer + maxtoken)
2093               p = extend_token_buffer (p);
2094             bzero (p, WCHAR_BYTES);
2095             p += WCHAR_BYTES;
2096           }
2097         else
2098           {
2099             if (p >= token_buffer + maxtoken)
2100               p = extend_token_buffer (p);
2101             *p++ = 0;
2102           }
2103
2104         if (c < 0)
2105           error ("Unterminated string constant");
2106
2107         /* We have read the entire constant.
2108            Construct a STRING_CST for the result.  */
2109
2110         if (wide_flag)
2111           {
2112             yylval.ttype = build_string (p - (token_buffer + 1),
2113                                          token_buffer + 1);
2114             TREE_TYPE (yylval.ttype) = wchar_array_type_node;
2115             value = STRING;
2116           }
2117         else if (objc_flag)
2118           {
2119             /* Return an Objective-C @"..." constant string object.  */
2120             yylval.ttype = build_objc_string (p - (token_buffer + 1),
2121                                               token_buffer + 1);
2122             TREE_TYPE (yylval.ttype) = char_array_type_node;
2123             value = OBJC_STRING;
2124           }
2125         else
2126           {
2127             yylval.ttype = build_string (p - (token_buffer + 1),
2128                                          token_buffer + 1);
2129             TREE_TYPE (yylval.ttype) = char_array_type_node;
2130             value = STRING;
2131           }
2132
2133         break;
2134       }
2135
2136     case '+':
2137     case '-':
2138     case '&':
2139     case '|':
2140     case ':':
2141     case '<':
2142     case '>':
2143     case '*':
2144     case '/':
2145     case '%':
2146     case '^':
2147     case '!':
2148     case '=':
2149       {
2150         register int c1;
2151
2152       combine:
2153
2154         switch (c)
2155           {
2156           case '+':
2157             yylval.code = PLUS_EXPR; break;
2158           case '-':
2159             yylval.code = MINUS_EXPR; break;
2160           case '&':
2161             yylval.code = BIT_AND_EXPR; break;
2162           case '|':
2163             yylval.code = BIT_IOR_EXPR; break;
2164           case '*':
2165             yylval.code = MULT_EXPR; break;
2166           case '/':
2167             yylval.code = TRUNC_DIV_EXPR; break;
2168           case '%':
2169             yylval.code = TRUNC_MOD_EXPR; break;
2170           case '^':
2171             yylval.code = BIT_XOR_EXPR; break;
2172           case LSHIFT:
2173             yylval.code = LSHIFT_EXPR; break;
2174           case RSHIFT:
2175             yylval.code = RSHIFT_EXPR; break;
2176           case '<':
2177             yylval.code = LT_EXPR; break;
2178           case '>':
2179             yylval.code = GT_EXPR; break;
2180           }
2181
2182         token_buffer[1] = c1 = GETC();
2183         token_buffer[2] = 0;
2184
2185         if (c1 == '=')
2186           {
2187             switch (c)
2188               {
2189               case '<':
2190                 value = ARITHCOMPARE; yylval.code = LE_EXPR; goto done;
2191               case '>':
2192                 value = ARITHCOMPARE; yylval.code = GE_EXPR; goto done;
2193               case '!':
2194                 value = EQCOMPARE; yylval.code = NE_EXPR; goto done;
2195               case '=':
2196                 value = EQCOMPARE; yylval.code = EQ_EXPR; goto done;
2197               }
2198             value = ASSIGN; goto done;
2199           }
2200         else if (c == c1)
2201           switch (c)
2202             {
2203             case '+':
2204               value = PLUSPLUS; goto done;
2205             case '-':
2206               value = MINUSMINUS; goto done;
2207             case '&':
2208               value = ANDAND; goto done;
2209             case '|':
2210               value = OROR; goto done;
2211             case '<':
2212               c = LSHIFT;
2213               goto combine;
2214             case '>':
2215               c = RSHIFT;
2216               goto combine;
2217             }
2218         else
2219           switch (c)
2220             {
2221             case '-':
2222               if (c1 == '>')
2223                 { value = POINTSAT; goto done; }
2224               break;
2225             case ':':
2226               if (c1 == '>')
2227                 { value = ']'; goto done; }
2228               break;
2229             case '<':
2230               if (c1 == '%')
2231                 { value = '{'; indent_level++; goto done; }
2232               if (c1 == ':')
2233                 { value = '['; goto done; }
2234               break;
2235             case '%':
2236               if (c1 == '>')
2237                 { value = '}'; indent_level--; goto done; }
2238               break;
2239             }
2240         UNGETC (c1);
2241         token_buffer[1] = 0;
2242
2243         if ((c == '<') || (c == '>'))
2244           value = ARITHCOMPARE;
2245         else value = c;
2246         goto done;
2247       }
2248
2249     case 0:
2250       /* Don't make yyparse think this is eof.  */
2251       value = 1;
2252       break;
2253
2254     case '{':
2255       indent_level++;
2256       value = c;
2257       break;
2258
2259     case '}':
2260       indent_level--;
2261       value = c;
2262       break;
2263
2264     default:
2265       value = c;
2266     }
2267
2268 done:
2269 /*  yylloc.last_line = lineno; */
2270
2271   return value;
2272 }
2273
2274 /* Sets the value of the 'yydebug' variable to VALUE.
2275    This is a function so we don't have to have YYDEBUG defined
2276    in order to build the compiler.  */
2277
2278 void
2279 set_yydebug (value)
2280      int value;
2281 {
2282 #if YYDEBUG != 0
2283   yydebug = value;
2284 #else
2285   warning ("YYDEBUG not defined.");
2286 #endif
2287 }