data/c.m4

   1                                                             -*- Autoconf -*-
   2
   3 # C M4 Macros for Bison.
   4
   5 # Copyright (C) 2002, 2004-2012 Free Software Foundation, Inc.
   6
   7 # This program is free software: you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation, either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 m4_include(b4_pkgdatadir/[c-like.m4])
  21
  22 # b4_tocpp(STRING)
  23 # ----------------
  24 # Convert STRING into a valid C macro name.
  25 m4_define([b4_tocpp],
  26 [m4_toupper(m4_bpatsubst(m4_quote($1), [[^a-zA-Z0-9]+], [_]))])
  27
  28
  29 # b4_cpp_guard(FILE)
  30 # ------------------
  31 # A valid C macro name to use as a CPP header guard for FILE.
  32 m4_define([b4_cpp_guard],
  33 [[YY_]b4_tocpp(m4_defn([b4_prefix])/[$1])[_INCLUDED]])
  34
  35
  36 # b4_cpp_guard_open(FILE)
  37 # b4_cpp_guard_close(FILE)
  38 # ------------------------
  39 # If FILE does not expand to nothing, open/close CPP inclusion guards for FILE.
  40 m4_define([b4_cpp_guard_open],
  41 [m4_ifval(m4_quote($1),
  42 [#ifndef b4_cpp_guard([$1])
  43 # define b4_cpp_guard([$1])])])
  44
  45 m4_define([b4_cpp_guard_close],
  46 [m4_ifval(m4_quote($1),
  47 [#endif b4_comment([!b4_cpp_guard([$1])])])])
  48
  49
  50 ## ---------------- ##
  51 ## Identification.  ##
  52 ## ---------------- ##
  53
  54 # b4_comment(TEXT)
  55 # ----------------
  56 m4_define([b4_comment], [/* m4_bpatsubst([$1], [
  57 ], [
  58    ])  */])
  59
  60 # b4_identification
  61 # -----------------
  62 # Depends on individual skeletons to define b4_pure_flag, b4_push_flag, or
  63 # b4_pull_flag if they use the values of the %define variables api.pure or
  64 # api.push-pull.
  65 m4_define([b4_identification],
  66 [[/* Identify Bison output.  */
  67 #define YYBISON 1
  68
  69 /* Bison version.  */
  70 #define YYBISON_VERSION "]b4_version["
  71
  72 /* Skeleton name.  */
  73 #define YYSKELETON_NAME ]b4_skeleton[]m4_ifdef([b4_pure_flag], [[
  74
  75 /* Pure parsers.  */
  76 #define YYPURE ]b4_pure_flag])[]m4_ifdef([b4_push_flag], [[
  77
  78 /* Push parsers.  */
  79 #define YYPUSH ]b4_push_flag])[]m4_ifdef([b4_pull_flag], [[
  80
  81 /* Pull parsers.  */
  82 #define YYPULL ]b4_pull_flag])[
  83 ]])
  84
  85
  86 ## ---------------- ##
  87 ## Default values.  ##
  88 ## ---------------- ##
  89
  90 # b4_api_prefix, b4_api_PREFIX
  91 # ----------------------------
  92 # Corresponds to %define api.prefix
  93 b4_percent_define_default([[api.prefix]], [[yy]])
  94 m4_define([b4_api_prefix],
  95 [b4_percent_define_get([[api.prefix]])])
  96 m4_define([b4_api_PREFIX],
  97 [m4_toupper(b4_api_prefix)])
  98
  99
 100 # b4_prefix
 101 # ---------
 102 # If the %name-prefix is not given, it is api.prefix.
 103 m4_define_default([b4_prefix], [b4_api_prefix])
 104
 105 # If the %union is not named, its name is YYSTYPE.
 106 m4_define_default([b4_union_name], [b4_api_PREFIX[]STYPE])
 107
 108
 109 ## ------------------------ ##
 110 ## Pure/impure interfaces.  ##
 111 ## ------------------------ ##
 112
 113 # b4_user_args
 114 # ------------
 115 m4_define([b4_user_args],
 116 [m4_ifset([b4_parse_param], [, b4_c_args(b4_parse_param)])])
 117
 118
 119 # b4_parse_param
 120 # --------------
 121 # If defined, b4_parse_param arrives double quoted, but below we prefer
 122 # it to be single quoted.
 123 m4_define([b4_parse_param],
 124 b4_parse_param)
 125
 126
 127 # b4_parse_param_for(DECL, FORMAL, BODY)
 128 # ---------------------------------------
 129 # Iterate over the user parameters, binding the declaration to DECL,
 130 # the formal name to FORMAL, and evaluating the BODY.
 131 m4_define([b4_parse_param_for],
 132 [m4_foreach([$1_$2], m4_defn([b4_parse_param]),
 133 [m4_pushdef([$1], m4_unquote(m4_car($1_$2)))dnl
 134 m4_pushdef([$2], m4_shift($1_$2))dnl
 135 $3[]dnl
 136 m4_popdef([$2])dnl
 137 m4_popdef([$1])dnl
 138 ])])
 139
 140 # b4_parse_param_use
 141 # ------------------
 142 # `YYUSE' all the parse-params.
 143 m4_define([b4_parse_param_use],
 144 [b4_parse_param_for([Decl], [Formal], [  YYUSE (Formal);
 145 ])dnl
 146 ])
 147
 148
 149 ## ------------ ##
 150 ## Data Types.  ##
 151 ## ------------ ##
 152
 153 # b4_int_type(MIN, MAX)
 154 # ---------------------
 155 # Return the smallest int type able to handle numbers ranging from
 156 # MIN to MAX (included).
 157 m4_define([b4_int_type],
 158 [m4_if(b4_ints_in($@,      [0],   [255]), [1], [unsigned char],
 159        b4_ints_in($@,   [-128],   [127]), [1], [signed char],
 160
 161        b4_ints_in($@,      [0], [65535]), [1], [unsigned short int],
 162        b4_ints_in($@, [-32768], [32767]), [1], [short int],
 163
 164        m4_eval([0 <= $1]),                [1], [unsigned int],
 165
 166                                                [int])])
 167
 168
 169 # b4_int_type_for(NAME)
 170 # ---------------------
 171 # Return the smallest int type able to handle numbers ranging from
 172 # `NAME_min' to `NAME_max' (included).
 173 m4_define([b4_int_type_for],
 174 [b4_int_type($1_min, $1_max)])
 175
 176
 177 # b4_table_value_equals(TABLE, VALUE, LITERAL)
 178 # --------------------------------------------
 179 # Without inducing a comparison warning from the compiler, check if the
 180 # literal value LITERAL equals VALUE from table TABLE, which must have
 181 # TABLE_min and TABLE_max defined.  YYID must be defined as an identity
 182 # function that suppresses warnings about constant conditions.
 183 m4_define([b4_table_value_equals],
 184 [m4_if(m4_eval($3 < m4_indir([b4_]$1[_min])
 185                || m4_indir([b4_]$1[_max]) < $3), [1],
 186        [[YYID (0)]],
 187        [[((]$2[) == (]$3[))]])])
 188
 189
 190 ## ---------##
 191 ## Values.  ##
 192 ## ---------##
 193
 194
 195 # b4_null_define
 196 # --------------
 197 # Portability issues: define a YY_NULL appropriate for the current
 198 # language (C, C++98, or C++11).
 199 m4_define([b4_null_define],
 200 [# ifndef YY_NULL
 201 #  if defined __cplusplus && 201103L <= __cplusplus
 202 #   define YY_NULL nullptr
 203 #  else
 204 #   define YY_NULL 0
 205 #  endif
 206 # endif[]dnl
 207 ])
 208
 209
 210 # b4_null
 211 # -------
 212 # Return a null pointer constant.
 213 m4_define([b4_null], [YY_NULL])
 214
 215
 216
 217 ## ------------------------- ##
 218 ## Assigning token numbers.  ##
 219 ## ------------------------- ##
 220
 221 # b4_token_define(TOKEN-NAME, TOKEN-NUMBER)
 222 # -----------------------------------------
 223 # Output the definition of this token as #define.
 224 m4_define([b4_token_define],
 225 [#define $1 $2
 226 ])
 227
 228
 229 # b4_token_defines(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
 230 # -------------------------------------------------------
 231 # Output the definition of the tokens (if there are) as #defines.
 232 m4_define([b4_token_defines],
 233 [m4_if([$#$1], [1], [],
 234 [/* Tokens.  */
 235 m4_map([b4_token_define], [$@])])
 236 ])
 237
 238
 239 # b4_token_enum(TOKEN-NAME, TOKEN-NUMBER)
 240 # ---------------------------------------
 241 # Output the definition of this token as an enum.
 242 m4_define([b4_token_enum],
 243 [$1 = $2])
 244
 245
 246 # b4_token_enums(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
 247 # -----------------------------------------------------
 248 # Output the definition of the tokens (if there are) as enums.
 249 m4_define([b4_token_enums],
 250 [m4_if([$#$1], [1], [],
 251 [[/* Tokens.  */
 252 #ifndef ]b4_api_PREFIX[TOKENTYPE
 253 # define ]b4_api_PREFIX[TOKENTYPE
 254    /* Put the tokens into the symbol table, so that GDB and other debuggers
 255       know about them.  */
 256    enum ]b4_api_prefix[tokentype {
 257 ]m4_map_sep([     b4_token_enum], [,
 258 ],
 259            [$@])[
 260    };
 261 #endif
 262 ]])])
 263
 264
 265 # b4_token_enums_defines(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
 266 # -------------------------------------------------------------
 267 # Output the definition of the tokens (if there are any) as enums and, if POSIX
 268 # Yacc is enabled, as #defines.
 269 m4_define([b4_token_enums_defines],
 270 [b4_token_enums($@)b4_yacc_if([b4_token_defines($@)], [])
 271 ])
 272
 273
 274
 275 ## --------------------------------------------- ##
 276 ## Defining C functions in both K&R and ANSI-C.  ##
 277 ## --------------------------------------------- ##
 278
 279
 280 # b4_modern_c
 281 # -----------
 282 # A predicate useful in #if to determine whether C is ancient or modern.
 283 #
 284 # If __STDC__ is defined, the compiler is modern.  IBM xlc 7.0 when run
 285 # as 'cc' doesn't define __STDC__ (or __STDC_VERSION__) for pedantic
 286 # reasons, but it defines __C99__FUNC__ so check that as well.
 287 # Microsoft C normally doesn't define these macros, but it defines _MSC_VER.
 288 # Consider a C++ compiler to be modern if it defines __cplusplus.
 289 #
 290 m4_define([b4_c_modern],
 291   [[(defined __STDC__ || defined __C99__FUNC__ \
 292      || defined __cplusplus || defined _MSC_VER)]])
 293
 294 # b4_c_function_def(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 295 # ----------------------------------------------------------
 296 # Declare the function NAME.
 297 m4_define([b4_c_function_def],
 298 [#if b4_c_modern
 299 b4_c_ansi_function_def($@)
 300 #else
 301 $2
 302 $1 (b4_c_knr_formal_names(m4_shift2($@)))
 303 b4_c_knr_formal_decls(m4_shift2($@))
 304 #endif[]dnl
 305 ])
 306
 307
 308 # b4_c_ansi_function_def(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 309 # ---------------------------------------------------------------
 310 # Declare the function NAME in ANSI.
 311 m4_define([b4_c_ansi_function_def],
 312 [$2
 313 $1 (b4_c_ansi_formals(m4_shift2($@)))[]dnl
 314 ])
 315
 316
 317 # b4_c_ansi_formals([DECL1, NAME1], ...)
 318 # --------------------------------------
 319 # Output the arguments ANSI-C definition.
 320 m4_define([b4_c_ansi_formals],
 321 [m4_if([$#], [0], [void],
 322        [$#$1], [1], [void],
 323                [m4_map_sep([b4_c_ansi_formal], [, ], [$@])])])
 324
 325 m4_define([b4_c_ansi_formal],
 326 [$1])
 327
 328
 329 # b4_c_knr_formal_names([DECL1, NAME1], ...)
 330 # ------------------------------------------
 331 # Output the argument names.
 332 m4_define([b4_c_knr_formal_names],
 333 [m4_map_sep([b4_c_knr_formal_name], [, ], [$@])])
 334
 335 m4_define([b4_c_knr_formal_name],
 336 [$2])
 337
 338
 339 # b4_c_knr_formal_decls([DECL1, NAME1], ...)
 340 # ------------------------------------------
 341 # Output the K&R argument declarations.
 342 m4_define([b4_c_knr_formal_decls],
 343 [m4_map_sep([b4_c_knr_formal_decl],
 344             [
 345 ],
 346             [$@])])
 347
 348 m4_define([b4_c_knr_formal_decl],
 349 [    $1;])
 350
 351
 352
 353 ## ------------------------------------------------------------ ##
 354 ## Declaring (prototyping) C functions in both K&R and ANSI-C.  ##
 355 ## ------------------------------------------------------------ ##
 356
 357
 358 # b4_c_function_decl(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 359 # -----------------------------------------------------------
 360 # Declare the function NAME.
 361 m4_define([b4_c_function_decl],
 362 [#if defined __STDC__ || defined __cplusplus
 363 b4_c_ansi_function_decl($@)
 364 #else
 365 $2 $1 ();
 366 #endif[]dnl
 367 ])
 368
 369
 370 # b4_c_ansi_function_decl(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 371 # ----------------------------------------------------------------
 372 # Declare the function NAME.
 373 m4_define([b4_c_ansi_function_decl],
 374 [$2 $1 (b4_c_ansi_formals(m4_shift2($@)));[]dnl
 375 ])
 376
 377
 378
 379
 380 ## --------------------- ##
 381 ## Calling C functions.  ##
 382 ## --------------------- ##
 383
 384
 385 # b4_c_function_call(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 386 # -----------------------------------------------------------
 387 # Call the function NAME with arguments NAME1, NAME2 etc.
 388 m4_define([b4_c_function_call],
 389 [$1 (b4_c_args(m4_shift2($@)))[]dnl
 390 ])
 391
 392
 393 # b4_c_args([DECL1, NAME1], ...)
 394 # ------------------------------
 395 # Output the arguments NAME1, NAME2...
 396 m4_define([b4_c_args],
 397 [m4_map_sep([b4_c_arg], [, ], [$@])])
 398
 399 m4_define([b4_c_arg],
 400 [$2])
 401
 402
 403 ## ----------- ##
 404 ## Synclines.  ##
 405 ## ----------- ##
 406
 407 # b4_sync_start(LINE, FILE)
 408 # -----------------------
 409 m4_define([b4_sync_start], [[#]line $1 $2])
 410
 411
 412 ## -------------- ##
 413 ## User actions.  ##
 414 ## -------------- ##
 415
 416 # b4_case(LABEL, STATEMENTS)
 417 # --------------------------
 418 m4_define([b4_case],
 419 [  case $1:
 420 $2
 421     break;])
 422
 423 # b4_symbol_actions(FILENAME, LINENO,
 424 #                   SYMBOL-TAG, SYMBOL-NUM,
 425 #                   SYMBOL-ACTION, SYMBOL-TYPENAME)
 426 # -------------------------------------------------
 427 # Issue the code for a symbol action (e.g., %printer).
 428 #
 429 # Define b4_dollar_dollar([TYPE-NAME]), and b4_at_dollar, which are
 430 # invoked where $<TYPE-NAME>$ and @$ were specified by the user.
 431 m4_define([b4_symbol_actions],
 432 [b4_dollar_pushdef([(*yyvaluep)], [$6], [(*yylocationp)])dnl
 433       case $4: /* $3 */
 434 b4_syncline([$2], [$1])
 435         $5;
 436 b4_syncline([@oline@], [@ofile@])
 437         break;
 438 b4_dollar_popdef[]dnl
 439 ])
 440
 441
 442 # b4_yydestruct_generate(FUNCTION-DECLARATOR)
 443 # -------------------------------------------
 444 # Generate the "yydestruct" function, which declaration is issued using
 445 # FUNCTION-DECLARATOR, which may be "b4_c_ansi_function_def" for ISO C
 446 # or "b4_c_function_def" for K&R.
 447 m4_define_default([b4_yydestruct_generate],
 448 [[/*-----------------------------------------------.
 449 | Release the memory associated to this symbol.  |
 450 `-----------------------------------------------*/
 451
 452 /*ARGSUSED*/
 453 ]$1([yydestruct],
 454     [static void],
 455     [[const char *yymsg],    [yymsg]],
 456     [[int yytype],           [yytype]],
 457     [[YYSTYPE *yyvaluep],    [yyvaluep]][]dnl
 458 b4_locations_if(            [, [[YYLTYPE *yylocationp], [yylocationp]]])[]dnl
 459 m4_ifset([b4_parse_param], [, b4_parse_param]))[
 460 {
 461   YYUSE (yyvaluep);
 462 ]b4_locations_if([  YYUSE (yylocationp);
 463 ])dnl
 464 b4_parse_param_use[]dnl
 465 [
 466   if (!yymsg)
 467     yymsg = "Deleting";
 468   YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp);
 469
 470   switch (yytype)
 471     {
 472 ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[
 473       default:
 474         break;
 475     }
 476 }]dnl
 477 ])
 478
 479
 480 # b4_yy_symbol_print_generate(FUNCTION-DECLARATOR)
 481 # ------------------------------------------------
 482 # Generate the "yy_symbol_print" function, which declaration is issued using
 483 # FUNCTION-DECLARATOR, which may be "b4_c_ansi_function_def" for ISO C
 484 # or "b4_c_function_def" for K&R.
 485 m4_define_default([b4_yy_symbol_print_generate],
 486 [[
 487 /*--------------------------------.
 488 | Print this symbol on YYOUTPUT.  |
 489 `--------------------------------*/
 490
 491 /*ARGSUSED*/
 492 ]$1([yy_symbol_value_print],
 493     [static void],
 494                [[FILE *yyoutput],                       [yyoutput]],
 495                [[int yytype],                           [yytype]],
 496                [[YYSTYPE const * const yyvaluep],       [yyvaluep]][]dnl
 497 b4_locations_if([, [[YYLTYPE const * const yylocationp], [yylocationp]]])[]dnl
 498 m4_ifset([b4_parse_param], [, b4_parse_param]))[
 499 {
 500   FILE *yyo = yyoutput;
 501   YYUSE (yyo);
 502   if (!yyvaluep)
 503     return;
 504 ]b4_locations_if([  YYUSE (yylocationp);
 505 ])dnl
 506 b4_parse_param_use[]dnl
 507 [# ifdef YYPRINT
 508   if (yytype < YYNTOKENS)
 509     YYPRINT (yyoutput, yytoknum[yytype], *yyvaluep);
 510 # else
 511   YYUSE (yyoutput);
 512 # endif
 513   switch (yytype)
 514     {
 515 ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
 516 [      default:
 517         break;
 518     }
 519 }
 520
 521
 522 /*--------------------------------.
 523 | Print this symbol on YYOUTPUT.  |
 524 `--------------------------------*/
 525
 526 ]$1([yy_symbol_print],
 527     [static void],
 528                [[FILE *yyoutput],                       [yyoutput]],
 529                [[int yytype],                           [yytype]],
 530                [[YYSTYPE const * const yyvaluep],       [yyvaluep]][]dnl
 531 b4_locations_if([, [[YYLTYPE const * const yylocationp], [yylocationp]]])[]dnl
 532 m4_ifset([b4_parse_param], [, b4_parse_param]))[
 533 {
 534   if (yytype < YYNTOKENS)
 535     YYFPRINTF (yyoutput, "token %s (", yytname[yytype]);
 536   else
 537     YYFPRINTF (yyoutput, "nterm %s (", yytname[yytype]);
 538
 539 ]b4_locations_if([  YY_LOCATION_PRINT (yyoutput, *yylocationp);
 540   YYFPRINTF (yyoutput, ": ");
 541 ])dnl
 542 [  yy_symbol_value_print (yyoutput, yytype, yyvaluep]dnl
 543 b4_locations_if([, yylocationp])[]b4_user_args[);
 544   YYFPRINTF (yyoutput, ")");
 545 }]dnl
 546 ])
 547
 548 ## -------------- ##
 549 ## Declarations.  ##
 550 ## -------------- ##
 551
 552 # b4_declare_yylstype
 553 # -------------------
 554 # Declarations that might either go into the header (if --defines) or
 555 # in the parser body.  Declare YYSTYPE/YYLTYPE, and yylval/yylloc.
 556 m4_define([b4_declare_yylstype],
 557 [[#if ! defined ]b4_api_PREFIX[STYPE && ! defined ]b4_api_PREFIX[STYPE_IS_DECLARED
 558 ]m4_ifdef([b4_stype],
 559 [[typedef union ]b4_union_name[
 560 {
 561 ]b4_user_stype[
 562 } ]b4_api_PREFIX[STYPE;
 563 # define ]b4_api_PREFIX[STYPE_IS_TRIVIAL 1]],
 564 [m4_if(b4_tag_seen_flag, 0,
 565 [[typedef int ]b4_api_PREFIX[STYPE;
 566 # define ]b4_api_PREFIX[STYPE_IS_TRIVIAL 1]])])[
 567 # define ]b4_api_prefix[stype ]b4_api_PREFIX[STYPE /* obsolescent; will be withdrawn */
 568 # define ]b4_api_PREFIX[STYPE_IS_DECLARED 1
 569 #endif]b4_locations_if([[
 570
 571 #if ! defined ]b4_api_PREFIX[LTYPE && ! defined ]b4_api_PREFIX[LTYPE_IS_DECLARED
 572 typedef struct ]b4_api_PREFIX[LTYPE
 573 {
 574   int first_line;
 575   int first_column;
 576   int last_line;
 577   int last_column;
 578 } ]b4_api_PREFIX[LTYPE;
 579 # define ]b4_api_prefix[ltype ]b4_api_PREFIX[LTYPE /* obsolescent; will be withdrawn */
 580 # define ]b4_api_PREFIX[LTYPE_IS_DECLARED 1
 581 # define ]b4_api_PREFIX[LTYPE_IS_TRIVIAL 1
 582 #endif]])
 583
 584 b4_pure_if([], [[extern ]b4_api_PREFIX[STYPE ]b4_prefix[lval;
 585 ]b4_locations_if([[extern ]b4_api_PREFIX[LTYPE ]b4_prefix[lloc;]])])[]dnl
 586 ])
 587
 588 # b4_YYDEBUG_define
 589 # ------------------
 590 m4_define([b4_YYDEBUG_define],
 591 [[/* Enabling traces.  */
 592 ]m4_if(b4_api_prefix, [yy],
 593 [[#ifndef YYDEBUG
 594 # define YYDEBUG ]b4_debug_flag[
 595 #endif]],
 596 [[#ifndef ]b4_api_PREFIX[DEBUG
 597 # if defined YYDEBUG
 598 #  if YYDEBUG
 599 #   define ]b4_api_PREFIX[DEBUG 1
 600 #  else
 601 #   define ]b4_api_PREFIX[DEBUG 0
 602 #  endif
 603 # else /* ! defined YYDEBUG */
 604 #  define ]b4_api_PREFIX[DEBUG ]b4_debug_flag[
 605 # endif /* ! defined ]b4_api_PREFIX[DEBUG */
 606 #endif  /* ! defined ]b4_api_PREFIX[DEBUG */]])[]dnl
 607 ])
 608
 609 # b4_declare_yydebug
 610 # ------------------
 611 m4_define([b4_declare_yydebug],
 612 [b4_YYDEBUG_define[
 613 #if ]b4_api_PREFIX[DEBUG
 614 extern int ]b4_prefix[debug;
 615 #endif][]dnl
 616 ])
 617
 618 # b4_yylloc_default_define
 619 # ------------------------
 620 # Define YYLLOC_DEFAULT.
 621 m4_define([b4_yylloc_default_define],
 622 [[/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
 623    If N is 0, then set CURRENT to the empty location which ends
 624    the previous symbol: RHS[0] (always defined).  */
 625
 626 #ifndef YYLLOC_DEFAULT
 627 # define YYLLOC_DEFAULT(Current, Rhs, N)                                \
 628     do                                                                  \
 629       if (YYID (N))                                                     \
 630         {                                                               \
 631           (Current).first_line   = YYRHSLOC (Rhs, 1).first_line;        \
 632           (Current).first_column = YYRHSLOC (Rhs, 1).first_column;      \
 633           (Current).last_line    = YYRHSLOC (Rhs, N).last_line;         \
 634           (Current).last_column  = YYRHSLOC (Rhs, N).last_column;       \
 635         }                                                               \
 636       else                                                              \
 637         {                                                               \
 638           (Current).first_line   = (Current).last_line   =              \
 639             YYRHSLOC (Rhs, 0).last_line;                                \
 640           (Current).first_column = (Current).last_column =              \
 641             YYRHSLOC (Rhs, 0).last_column;                              \
 642         }                                                               \
 643     while (YYID (0))
 644 #endif
 645 ]])