1%{/* Bison Grammar Parser                             -*- C -*-
2
3   Copyright (C) 2002-2012 Free Software Foundation, Inc.
4
5   This file is part of Bison, the GNU Compiler Compiler.
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#include <config.h>
21#include "system.h"
22
23#include "c-ctype.h"
24#include "complain.h"
25#include "conflicts.h"
26#include "files.h"
27#include "getargs.h"
28#include "gram.h"
29#include "muscle-tab.h"
30#include "named-ref.h"
31#include "quotearg.h"
32#include "reader.h"
33#include "symlist.h"
34#include "scan-gram.h"
35#include "scan-code.h"
36#include "xmemdup0.h"
37
38#define YYLLOC_DEFAULT(Current, Rhs, N)  (Current) = lloc_default (Rhs, N)
39static YYLTYPE lloc_default (YYLTYPE const *, int);
40
41#define YY_LOCATION_PRINT(File, Loc) \
42	  location_print (File, Loc)
43
44static void version_check (location const *loc, char const *version);
45
46/* Request detailed syntax error messages, and pass them to GRAM_ERROR.
47   FIXME: depends on the undocumented availability of YYLLOC.  */
48#undef  yyerror
49#define yyerror(Msg) \
50	gram_error (&yylloc, Msg)
51static void gram_error (location const *, char const *);
52
53static char const *char_name (char);
54
55/** Add a lex-param or a parse-param.
56 *
57 * \param type  \a lex_param or \a parse_param
58 * \param decl  the formal argument
59 * \param loc   the location in the source.
60 */
61static void add_param (char const *type, char *decl, location loc);
62
63
64static symbol_class current_class = unknown_sym;
65static uniqstr current_type = NULL;
66static symbol *current_lhs_symbol;
67static location current_lhs_location;
68static named_ref *current_lhs_named_ref;
69static int current_prec = 0;
70
71/** Set the new current left-hand side symbol, possibly common
72 * to several right-hand side parts of rule.
73 */
74static
75void
76current_lhs(symbol *sym, location loc, named_ref *ref)
77{
78  current_lhs_symbol = sym;
79  current_lhs_location = loc;
80  /* In order to simplify memory management, named references for lhs
81     are always assigned by deep copy into the current symbol_list
82     node.  This is because a single named-ref in the grammar may
83     result in several uses when the user factors lhs between several
84     rules using "|".  Therefore free the parser's original copy.  */
85  free (current_lhs_named_ref);
86  current_lhs_named_ref = ref;
87}
88
89
90#define YYTYPE_INT16 int_fast16_t
91#define YYTYPE_INT8 int_fast8_t
92#define YYTYPE_UINT16 uint_fast16_t
93#define YYTYPE_UINT8 uint_fast8_t
94%}
95
96%debug
97%define api.prefix "gram_"
98%define api.pure
99%define parse.lac full
100%defines
101%error-verbose
102%expect 0
103%locations
104%verbose
105
106%initial-action
107{
108  /* Bison's grammar can initial empty locations, hence a default
109     location is needed. */
110  boundary_set (&@$.start, current_file, 1, 1);
111  boundary_set (&@$.end, current_file, 1, 1);
112}
113
114%union
115{
116  symbol *symbol;
117  symbol_list *list;
118  int integer;
119  char const *chars;
120  char *code;
121  assoc assoc;
122  uniqstr uniqstr;
123  unsigned char character;
124  named_ref *named_ref;
125};
126
127/* Define the tokens together with their human representation.  */
128%token GRAM_EOF 0 "end of file"
129%token STRING     "string"
130%token INT        "integer"
131
132%token PERCENT_TOKEN       "%token"
133%token PERCENT_NTERM       "%nterm"
134
135%token PERCENT_TYPE        "%type"
136%token PERCENT_DESTRUCTOR  "%destructor"
137%token PERCENT_PRINTER     "%printer"
138
139%token PERCENT_LEFT        "%left"
140%token PERCENT_RIGHT       "%right"
141%token PERCENT_NONASSOC    "%nonassoc"
142
143%token PERCENT_PREC          "%prec"
144%token PERCENT_DPREC         "%dprec"
145%token PERCENT_MERGE         "%merge"
146
147
148/*----------------------.
149| Global Declarations.  |
150`----------------------*/
151
152%token
153  PERCENT_CODE            "%code"
154  PERCENT_DEBUG           "%debug"
155  PERCENT_DEFAULT_PREC    "%default-prec"
156  PERCENT_DEFINE          "%define"
157  PERCENT_DEFINES         "%defines"
158  PERCENT_ERROR_VERBOSE   "%error-verbose"
159  PERCENT_EXPECT          "%expect"
160  PERCENT_EXPECT_RR	  "%expect-rr"
161  PERCENT_FILE_PREFIX     "%file-prefix"
162  PERCENT_GLR_PARSER      "%glr-parser"
163  PERCENT_INITIAL_ACTION  "%initial-action"
164  PERCENT_LANGUAGE        "%language"
165  PERCENT_LEX_PARAM       "%lex-param"
166  PERCENT_LOCATIONS       "%locations"
167  PERCENT_NAME_PREFIX     "%name-prefix"
168  PERCENT_NO_DEFAULT_PREC "%no-default-prec"
169  PERCENT_NO_LINES        "%no-lines"
170  PERCENT_NONDETERMINISTIC_PARSER
171			  "%nondeterministic-parser"
172  PERCENT_OUTPUT          "%output"
173  PERCENT_PARSE_PARAM     "%parse-param"
174  PERCENT_PURE_PARSER     "%pure-parser"
175  PERCENT_REQUIRE	  "%require"
176  PERCENT_SKELETON        "%skeleton"
177  PERCENT_START           "%start"
178  PERCENT_TOKEN_TABLE     "%token-table"
179  PERCENT_VERBOSE         "%verbose"
180  PERCENT_YACC            "%yacc"
181;
182
183%token BRACED_CODE     "{...}"
184%token BRACKETED_ID    "[identifier]"
185%token CHAR            "char"
186%token EPILOGUE        "epilogue"
187%token EQUAL           "="
188%token ID              "identifier"
189%token ID_COLON        "identifier:"
190%token PERCENT_PERCENT "%%"
191%token PIPE            "|"
192%token PROLOGUE        "%{...%}"
193%token SEMICOLON       ";"
194%token TYPE            "type"
195%token TYPE_TAG_ANY    "<*>"
196%token TYPE_TAG_NONE   "<>"
197
198%type <character> CHAR
199%printer { fputs (char_name ($$), stderr); } CHAR
200
201/* braceless is not to be used for rule or symbol actions, as it
202   calls code_props_plain_init.  */
203%type <chars> STRING "%{...%}" EPILOGUE braceless content.opt
204%type <code> "{...}"
205%printer { fputs (quotearg_style (c_quoting_style, $$), stderr); }
206	 STRING
207%printer { fprintf (stderr, "{\n%s\n}", $$); }
208	 braceless content.opt "{...}" "%{...%}" EPILOGUE
209
210%type <uniqstr> BRACKETED_ID ID ID_COLON TYPE variable
211%printer { fputs ($$, stderr); } <uniqstr>
212%printer { fprintf (stderr, "[%s]", $$); } BRACKETED_ID
213%printer { fprintf (stderr, "%s:", $$); } ID_COLON
214%printer { fprintf (stderr, "<%s>", $$); } TYPE
215
216%type <integer> INT
217%printer { fprintf (stderr, "%d", $$); } <integer>
218
219%type <symbol> id id_colon string_as_id symbol symbol.prec
220%printer { fprintf (stderr, "%s", $$->tag); } <symbol>
221%printer { fprintf (stderr, "%s:", $$->tag); } id_colon
222
223%type <assoc> precedence_declarator
224%type <list>  symbols.1 symbols.prec generic_symlist generic_symlist_item
225%type <named_ref> named_ref.opt
226
227%%
228
229input:
230  prologue_declarations "%%" grammar epilogue.opt
231;
232
233
234	/*------------------------------------.
235	| Declarations: before the first %%.  |
236	`------------------------------------*/
237
238prologue_declarations:
239  /* Nothing */
240| prologue_declarations prologue_declaration
241;
242
243prologue_declaration:
244  grammar_declaration
245| "%{...%}"
246    {
247      code_props plain_code;
248      code_props_plain_init (&plain_code, $1, @1);
249      code_props_translate_code (&plain_code);
250      gram_scanner_last_string_free ();
251      muscle_code_grow (union_seen ? "post_prologue" : "pre_prologue",
252                        plain_code.code, @1);
253      code_scanner_last_string_free ();
254    }
255| "%debug"                         { debug = true; }
256| "%define" variable content.opt
257    {
258      muscle_percent_define_insert ($2, @2, $3,
259                                    MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE);
260    }
261| "%defines"                       { defines_flag = true; }
262| "%defines" STRING
263    {
264      defines_flag = true;
265      spec_defines_file = xstrdup ($2);
266    }
267| "%error-verbose"                 { error_verbose = true; }
268| "%expect" INT                    { expected_sr_conflicts = $2; }
269| "%expect-rr" INT		   { expected_rr_conflicts = $2; }
270| "%file-prefix" STRING            { spec_file_prefix = $2; }
271| "%file-prefix" "=" STRING        { spec_file_prefix = $3; } /* deprecated */
272| "%glr-parser"
273    {
274      nondeterministic_parser = true;
275      glr_parser = true;
276    }
277| "%initial-action" "{...}"
278    {
279      code_props action;
280      code_props_symbol_action_init (&action, $2, @2);
281      code_props_translate_code (&action);
282      gram_scanner_last_string_free ();
283      muscle_code_grow ("initial_action", action.code, @2);
284      code_scanner_last_string_free ();
285    }
286| "%language" STRING		{ language_argmatch ($2, grammar_prio, @1); }
287| "%lex-param" "{...}"		{ add_param ("lex_param", $2, @2); }
288| "%locations"                  { locations_flag = true; }
289| "%name-prefix" STRING         { spec_name_prefix = $2; }
290| "%name-prefix" "=" STRING     { spec_name_prefix = $3; } /* deprecated */
291| "%no-lines"                   { no_lines_flag = true; }
292| "%nondeterministic-parser"	{ nondeterministic_parser = true; }
293| "%output" STRING              { spec_outfile = $2; }
294| "%output" "=" STRING          { spec_outfile = $3; }  /* deprecated */
295| "%parse-param" "{...}"	{ add_param ("parse_param", $2, @2); }
296| "%pure-parser"
297    {
298      /* %pure-parser is deprecated in favor of `%define api.pure', so use
299         `%define api.pure' in a backward-compatible manner here.  First, don't
300         complain if %pure-parser is specified multiple times.  */
301      if (!muscle_find_const ("percent_define(api.pure)"))
302        muscle_percent_define_insert ("api.pure", @1, "",
303                                      MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE);
304      /* In all cases, use api.pure now so that the backend doesn't complain if
305         the skeleton ignores api.pure, but do warn now if there's a previous
306         conflicting definition from an actual %define.  */
307      if (!muscle_percent_define_flag_if ("api.pure"))
308        muscle_percent_define_insert ("api.pure", @1, "",
309                                      MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE);
310    }
311| "%require" STRING             { version_check (&@2, $2); }
312| "%skeleton" STRING
313    {
314      char const *skeleton_user = $2;
315      if (mbschr (skeleton_user, '/'))
316        {
317          size_t dir_length = strlen (current_file);
318          char *skeleton_build;
319          while (dir_length && current_file[dir_length - 1] != '/')
320            --dir_length;
321          while (dir_length && current_file[dir_length - 1] == '/')
322            --dir_length;
323          skeleton_build =
324            xmalloc (dir_length + 1 + strlen (skeleton_user) + 1);
325          if (dir_length > 0)
326            {
327              memcpy (skeleton_build, current_file, dir_length);
328              skeleton_build[dir_length++] = '/';
329            }
330          strcpy (skeleton_build + dir_length, skeleton_user);
331          skeleton_user = uniqstr_new (skeleton_build);
332          free (skeleton_build);
333        }
334      skeleton_arg (skeleton_user, grammar_prio, @1);
335    }
336| "%token-table"                { token_table_flag = true; }
337| "%verbose"                    { report_flag |= report_states; }
338| "%yacc"                       { yacc_flag = true; }
339| /*FIXME: Err?  What is this horror doing here? */ ";"
340;
341
342grammar_declaration:
343  precedence_declaration
344| symbol_declaration
345| "%start" symbol
346    {
347      grammar_start_symbol_set ($2, @2);
348    }
349| "%destructor" "{...}" generic_symlist
350    {
351      code_props code;
352      code_props_symbol_action_init (&code, $2, @2);
353      code_props_translate_code (&code);
354      {
355        symbol_list *list;
356        for (list = $3; list; list = list->next)
357          symbol_list_destructor_set (list, &code);
358        symbol_list_free ($3);
359      }
360    }
361| "%printer" "{...}" generic_symlist
362    {
363      code_props code;
364      code_props_symbol_action_init (&code, $2, @2);
365      code_props_translate_code (&code);
366      {
367        symbol_list *list;
368        for (list = $3; list; list = list->next)
369          symbol_list_printer_set (list, &code);
370        symbol_list_free ($3);
371      }
372    }
373| "%default-prec"
374    {
375      default_prec = true;
376    }
377| "%no-default-prec"
378    {
379      default_prec = false;
380    }
381| "%code" braceless
382    {
383      /* Do not invoke muscle_percent_code_grow here since it invokes
384         muscle_user_name_list_grow.  */
385      muscle_code_grow ("percent_code()", $2, @2);
386      code_scanner_last_string_free ();
387    }
388| "%code" ID braceless
389    {
390      muscle_percent_code_grow ($2, @2, $3, @3);
391      code_scanner_last_string_free ();
392    }
393;
394
395
396/*----------*
397 | %union.  |
398 *----------*/
399
400%token PERCENT_UNION "%union";
401
402union_name:
403  /* Nothing. */ {}
404| ID             { muscle_code_grow ("union_name", $1, @1); }
405;
406
407grammar_declaration:
408  "%union" union_name braceless
409    {
410      union_seen = true;
411      muscle_code_grow ("stype", $3, @3);
412      code_scanner_last_string_free ();
413    }
414;
415
416
417
418
419symbol_declaration:
420  "%nterm" { current_class = nterm_sym; } symbol_defs.1
421    {
422      current_class = unknown_sym;
423      current_type = NULL;
424    }
425| "%token" { current_class = token_sym; } symbol_defs.1
426    {
427      current_class = unknown_sym;
428      current_type = NULL;
429    }
430| "%type" TYPE symbols.1
431    {
432      symbol_list *list;
433      tag_seen = true;
434      for (list = $3; list; list = list->next)
435	symbol_type_set (list->content.sym, $2, @2);
436      symbol_list_free ($3);
437    }
438;
439
440precedence_declaration:
441  precedence_declarator type.opt symbols.prec
442    {
443      symbol_list *list;
444      ++current_prec;
445      for (list = $3; list; list = list->next)
446	{
447	  symbol_type_set (list->content.sym, current_type, @2);
448	  symbol_precedence_set (list->content.sym, current_prec, $1, @1);
449	}
450      symbol_list_free ($3);
451      current_type = NULL;
452    }
453;
454
455precedence_declarator:
456  "%left"     { $$ = left_assoc; }
457| "%right"    { $$ = right_assoc; }
458| "%nonassoc" { $$ = non_assoc; }
459;
460
461type.opt:
462  /* Nothing. */ { current_type = NULL; }
463| TYPE           { current_type = $1; tag_seen = true; }
464;
465
466/* Just like symbols.1 but accept INT for the sake of POSIX.  */
467symbols.prec:
468  symbol.prec
469    { $$ = symbol_list_sym_new ($1, @1); }
470| symbols.prec symbol.prec
471    { $$ = symbol_list_prepend ($1, symbol_list_sym_new ($2, @2)); }
472;
473
474symbol.prec:
475    symbol { $$ = $1; }
476  | symbol INT { $$ = $1; symbol_user_token_number_set ($1, $2, @2); }
477  ;
478
479/* One or more symbols to be %typed. */
480symbols.1:
481  symbol
482    { $$ = symbol_list_sym_new ($1, @1); }
483| symbols.1 symbol
484    { $$ = symbol_list_prepend ($1, symbol_list_sym_new ($2, @2)); }
485;
486
487generic_symlist:
488  generic_symlist_item { $$ = $1; }
489| generic_symlist generic_symlist_item { $$ = symbol_list_prepend ($1, $2); }
490;
491
492generic_symlist_item:
493  symbol            { $$ = symbol_list_sym_new ($1, @1); }
494| TYPE              { $$ = symbol_list_type_new ($1, @1); }
495| "<*>"             { $$ = symbol_list_default_tagged_new (@1); }
496| "<>"             { $$ = symbol_list_default_tagless_new (@1); }
497;
498
499/* One token definition.  */
500symbol_def:
501  TYPE
502     {
503       current_type = $1;
504       tag_seen = true;
505     }
506| id
507     {
508       symbol_class_set ($1, current_class, @1, true);
509       symbol_type_set ($1, current_type, @1);
510     }
511| id INT
512    {
513      symbol_class_set ($1, current_class, @1, true);
514      symbol_type_set ($1, current_type, @1);
515      symbol_user_token_number_set ($1, $2, @2);
516    }
517| id string_as_id
518    {
519      symbol_class_set ($1, current_class, @1, true);
520      symbol_type_set ($1, current_type, @1);
521      symbol_make_alias ($1, $2, @$);
522    }
523| id INT string_as_id
524    {
525      symbol_class_set ($1, current_class, @1, true);
526      symbol_type_set ($1, current_type, @1);
527      symbol_user_token_number_set ($1, $2, @2);
528      symbol_make_alias ($1, $3, @$);
529    }
530;
531
532/* One or more symbol definitions. */
533symbol_defs.1:
534  symbol_def
535| symbol_defs.1 symbol_def
536;
537
538
539	/*------------------------------------------.
540	| The grammar section: between the two %%.  |
541	`------------------------------------------*/
542
543grammar:
544  rules_or_grammar_declaration
545| grammar rules_or_grammar_declaration
546;
547
548/* As a Bison extension, one can use the grammar declarations in the
549   body of the grammar.  */
550rules_or_grammar_declaration:
551  rules
552| grammar_declaration ";"
553| error ";"
554    {
555      yyerrok;
556    }
557;
558
559rules:
560  id_colon named_ref.opt { current_lhs ($1, @1, $2); } rhses.1
561  {
562    /* Free the current lhs. */
563    current_lhs (0, @1, 0);
564  }
565;
566
567rhses.1:
568  rhs                { grammar_current_rule_end (@1); }
569| rhses.1 "|" rhs    { grammar_current_rule_end (@3); }
570| rhses.1 ";"
571;
572
573rhs:
574  /* Nothing.  */
575    { grammar_current_rule_begin (current_lhs_symbol, current_lhs_location,
576				  current_lhs_named_ref); }
577| rhs symbol named_ref.opt
578    { grammar_current_rule_symbol_append ($2, @2, $3); }
579| rhs "{...}" named_ref.opt
580    { grammar_current_rule_action_append ($2, @2, $3); }
581| rhs "%prec" symbol
582    { grammar_current_rule_prec_set ($3, @3); }
583| rhs "%dprec" INT
584    { grammar_current_rule_dprec_set ($3, @3); }
585| rhs "%merge" TYPE
586    { grammar_current_rule_merge_set ($3, @3); }
587;
588
589named_ref.opt:
590  /* Nothing. */ { $$ = 0; }
591|
592  BRACKETED_ID   { $$ = named_ref_new($1, @1); }
593;
594
595
596/*----------------------------*
597 | variable and content.opt.  |
598 *---------------------------*/
599
600/* The STRING form of variable is deprecated and is not M4-friendly.
601   For example, M4 fails for `%define "[" "value"'.  */
602variable:
603  ID
604| STRING { $$ = uniqstr_new ($1); }
605;
606
607/* Some content or empty by default. */
608content.opt:
609  /* Nothing. */   { $$ = ""; }
610| ID { $$ = $1; }
611| STRING
612;
613
614
615/*-------------*
616 | braceless.  |
617 *-------------*/
618
619braceless:
620  "{...}"
621    {
622      code_props plain_code;
623      $1[strlen ($1) - 1] = '\n';
624      code_props_plain_init (&plain_code, $1+1, @1);
625      code_props_translate_code (&plain_code);
626      gram_scanner_last_string_free ();
627      $$ = plain_code.code;
628    }
629;
630
631
632/*---------------*
633 | Identifiers.  |
634 *---------------*/
635
636/* Identifiers are returned as uniqstr values by the scanner.
637   Depending on their use, we may need to make them genuine symbols.  */
638
639id:
640  ID
641    { $$ = symbol_from_uniqstr ($1, @1); }
642| CHAR
643    {
644      $$ = symbol_get (char_name ($1), @1);
645      symbol_class_set ($$, token_sym, @1, false);
646      symbol_user_token_number_set ($$, $1, @1);
647    }
648;
649
650id_colon:
651  ID_COLON { $$ = symbol_from_uniqstr ($1, @1); }
652;
653
654
655symbol:
656  id
657| string_as_id
658;
659
660/* A string used as an ID: quote it.  */
661string_as_id:
662  STRING
663    {
664      $$ = symbol_get (quotearg_style (c_quoting_style, $1), @1);
665      symbol_class_set ($$, token_sym, @1, false);
666    }
667;
668
669epilogue.opt:
670  /* Nothing.  */
671| "%%" EPILOGUE
672    {
673      code_props plain_code;
674      code_props_plain_init (&plain_code, $2, @2);
675      code_props_translate_code (&plain_code);
676      gram_scanner_last_string_free ();
677      muscle_code_grow ("epilogue", plain_code.code, @2);
678      code_scanner_last_string_free ();
679    }
680;
681
682%%
683
684
685/* Return the location of the left-hand side of a rule whose
686   right-hand side is RHS[1] ... RHS[N].  Ignore empty nonterminals in
687   the right-hand side, and return an empty location equal to the end
688   boundary of RHS[0] if the right-hand side is empty.  */
689
690static YYLTYPE
691lloc_default (YYLTYPE const *rhs, int n)
692{
693  int i;
694  YYLTYPE loc;
695
696  /* SGI MIPSpro 7.4.1m miscompiles "loc.start = loc.end = rhs[n].end;".
697     The bug is fixed in 7.4.2m, but play it safe for now.  */
698  loc.start = rhs[n].end;
699  loc.end = rhs[n].end;
700
701  /* Ignore empty nonterminals the start of the right-hand side.
702     Do not bother to ignore them at the end of the right-hand side,
703     since empty nonterminals have the same end as their predecessors.  */
704  for (i = 1; i <= n; i++)
705    if (! equal_boundaries (rhs[i].start, rhs[i].end))
706      {
707	loc.start = rhs[i].start;
708	break;
709      }
710
711  return loc;
712}
713
714
715/* Add a lex-param or a parse-param (depending on TYPE) with
716   declaration DECL and location LOC.  */
717
718static void
719add_param (char const *type, char *decl, location loc)
720{
721  static char const alphanum[26 + 26 + 1 + 10] =
722    "abcdefghijklmnopqrstuvwxyz"
723    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
724    "_"
725    "0123456789";
726  char const *name_start = NULL;
727  char *p;
728
729  /* Stop on last actual character.  */
730  for (p = decl; p[1]; p++)
731    if ((p == decl
732	 || ! memchr (alphanum, p[-1], sizeof alphanum))
733	&& memchr (alphanum, p[0], sizeof alphanum - 10))
734      name_start = p;
735
736  /* Strip the surrounding '{' and '}', and any blanks just inside
737     the braces.  */
738  --p;
739  while (c_isspace ((unsigned char) *p))
740    --p;
741  p[1] = '\0';
742  ++decl;
743  while (c_isspace ((unsigned char) *decl))
744    ++decl;
745
746  if (! name_start)
747    complain_at (loc, _("missing identifier in parameter declaration"));
748  else
749    {
750      char *name = xmemdup0 (name_start, strspn (name_start, alphanum));
751      muscle_pair_list_grow (type, decl, name);
752      free (name);
753    }
754
755  gram_scanner_last_string_free ();
756}
757
758
759static void
760version_check (location const *loc, char const *version)
761{
762  if (strverscmp (version, PACKAGE_VERSION) > 0)
763    {
764      complain_at (*loc, "require bison %s, but have %s",
765                   version, PACKAGE_VERSION);
766      exit (EX_MISMATCH);
767    }
768}
769
770static void
771gram_error (location const *loc, char const *msg)
772{
773  complain_at (*loc, "%s", msg);
774}
775
776char const *
777token_name (int type)
778{
779  return yytname[YYTRANSLATE (type)];
780}
781
782static char const *
783char_name (char c)
784{
785  if (c == '\'')
786    return "'\\''";
787  else
788    {
789      char buf[4];
790      buf[0] = '\''; buf[1] = c; buf[2] = '\''; buf[3] = '\0';
791      return quotearg_style (escape_quoting_style, buf);
792    }
793}
794