# Yacc compatible skeleton for Bison
-# Copyright (C) 1984, 1989, 1990, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
-# 2007, 2008, 2009 Free Software Foundation, Inc.
+# Copyright (C) 1984, 1989-1990, 2000-2012 Free Software Foundation,
+# Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
[push], [m4_define([b4_pull_flag], [[0]])])
# Handle BISON_USE_PUSH_FOR_PULL for the test suite. So that push parsing
-# tests function as written, don't let BISON_USE_PUSH_FOR_PULL modify Bison's
-# behavior at all when push parsing is already requested.
+# tests function as written, do not let BISON_USE_PUSH_FOR_PULL modify the
+# behavior of Bison at all when push parsing is already requested.
b4_define_flag_if([use_push_for_pull])
b4_use_push_for_pull_if([
b4_push_if([m4_define([b4_use_push_for_pull_flag], [[0]])],
[m4_define([b4_push_flag], [[1]])])])
+# Check the value of %define parse.lac and friends, where LAC stands for
+# lookahead correction.
+b4_percent_define_default([[parse.lac]], [[none]])
+b4_percent_define_default([[parse.lac.es-capacity-initial]], [[20]])
+b4_percent_define_default([[parse.lac.memory-trace]], [[failures]])
+b4_percent_define_check_values([[[[parse.lac]], [[full]], [[none]]]],
+ [[[[parse.lac.memory-trace]],
+ [[failures]], [[full]]]])
+b4_define_flag_if([lac])
+m4_define([b4_lac_flag],
+ [m4_if(b4_percent_define_get([[parse.lac]]),
+ [none], [[0]], [[1]])])
+
m4_include(b4_pkgdatadir/[c.m4])
## ---------------- ##
[(yylsp@{($2) - ($1)@})])
-## ------------------ ##
-## Parser variables. ##
-## ------------------ ##
+## -------------- ##
+## Declarations. ##
+## -------------- ##
# b4_declare_scanner_communication_variables
# ------------------------------------------
`yyvs': related to semantic values.]b4_locations_if([[
`yyls': related to locations.]])[
- Refer to the stacks thru separate pointers, to allow yyoverflow
+ Refer to the stacks through separate pointers, to allow yyoverflow
to reallocate them elsewhere. */
/* The state stack. */
YYLTYPE *yylsp;
/* The locations where the error started and ended. */
- YYLTYPE yyerror_range[2];]])[
+ YYLTYPE yyerror_range[3];]])[
+
+ YYSIZE_T yystacksize;]b4_lac_if([[
- YYSIZE_T yystacksize;]])
+ yytype_int16 yyesa@{]b4_percent_define_get([[parse.lac.es-capacity-initial]])[@};
+ yytype_int16 *yyes;
+ YYSIZE_T yyes_capacity;]])])
-## --------------------------------------------------------- ##
-## Defining symbol actions, e.g., printers and destructors. ##
-## --------------------------------------------------------- ##
+# b4_declare_yyparse_push_
+# ------------------------
+# Declaration of yyparse (and dependencies) when using the push parser
+# (including in pull mode).
+m4_define([b4_declare_yyparse_push_],
+[[#ifndef YYPUSH_MORE_DEFINED
+# define YYPUSH_MORE_DEFINED
+enum { YYPUSH_MORE = 4 };
+#endif
+
+typedef struct ]b4_prefix[pstate ]b4_prefix[pstate;
+
+]b4_pull_if([b4_c_function_decl([b4_prefix[parse]], [[int]], b4_parse_param)
+])b4_c_function_decl([b4_prefix[push_parse]], [[int]],
+ [[b4_prefix[pstate *ps]], [[ps]]]b4_pure_if([,
+ [[[int pushed_char]], [[pushed_char]]],
+ [[b4_api_PREFIX[STYPE const *pushed_val]], [[pushed_val]]]b4_locations_if([,
+ [[b4_api_PREFIX[LTYPE const *pushed_loc]], [[pushed_loc]]]])])m4_ifset([b4_parse_param], [,
+ b4_parse_param]))
+b4_pull_if([b4_c_function_decl([b4_prefix[pull_parse]], [[int]],
+ [[b4_prefix[pstate *ps]], [[ps]]]m4_ifset([b4_parse_param], [,
+ b4_parse_param]))])
+b4_c_function_decl([b4_prefix[pstate_new]], [b4_prefix[pstate *]],
+ [[[void]], []])
+b4_c_function_decl([b4_prefix[pstate_delete]], [[void]],
+ [[b4_prefix[pstate *ps]], [[ps]]])dnl
+])
+
+# b4_declare_yyparse_
+# -------------------
+# When not the push parser.
+m4_define([b4_declare_yyparse_],
+[[#ifdef YYPARSE_PARAM
+]b4_c_function_decl(b4_prefix[parse], [int],
+ [[void *YYPARSE_PARAM], [YYPARSE_PARAM]])[
+#else /* ! YYPARSE_PARAM */
+]b4_c_function_decl(b4_prefix[parse], [int], b4_parse_param)[
+#endif /* ! YYPARSE_PARAM */]dnl
+])
+
+
+# b4_declare_yyparse
+# ------------------
+m4_define([b4_declare_yyparse],
+[b4_push_if([b4_declare_yyparse_push_],
+ [b4_declare_yyparse_])[]dnl
+])
+
+
+# b4_shared_declarations
+# ----------------------
+# Declaration that might either go into the header (if --defines)
+# or open coded in the parser body.
+m4_define([b4_shared_declarations],
+[b4_cpp_guard_open([b4_spec_defines_file])[
+]b4_declare_yydebug[
+]b4_percent_code_get([[requires]])[
+]b4_token_enums_defines(b4_tokens)[
+]b4_declare_yylstype[
+]b4_declare_yyparse[
+]b4_percent_code_get([[provides]])[
+]b4_cpp_guard_close([b4_spec_defines_file])[]dnl
+])
+
+## -------------- ##
+## Output files. ##
+## -------------- ##
# We do want M4 expansion after # for CPP macros.
m4_changecom()
m4_divert_push(0)dnl
@output(b4_parser_file_name@)@
-b4_copyright([Skeleton implementation for Bison's Yacc-like parsers in C],
- [1984, 1989, 1990, 2000, 2001, 2002, 2003, 2004, 2005,
- 2006, 2007, 2008, 2009])[
+b4_copyright([Bison implementation for Yacc-like parsers in C],
+ [1984, 1989-1990, 2000-2012])[
/* C LALR(1) parser skeleton written by Richard Stallman, by
simplifying the original so-called "semantic" parser. */
]b4_identification
b4_percent_code_get([[top]])[]dnl
-m4_if(b4_prefix, [yy], [],
+m4_if(b4_api_prefix, [yy], [],
+[[/* Substitute the type names. */
+#define YYSTYPE ]b4_api_PREFIX[STYPE]b4_locations_if([[
+#define YYLTYPE ]b4_api_PREFIX[LTYPE]])])[
+]m4_if(b4_prefix, [yy], [],
[[/* Substitute the variable and function names. */]b4_pull_if([[
#define yyparse ]b4_prefix[parse]])b4_push_if([[
#define yypush_parse ]b4_prefix[push_parse]b4_pull_if([[
#define yylval ]b4_prefix[lval
#define yychar ]b4_prefix[char
#define yydebug ]b4_prefix[debug
-#define yynerrs ]b4_prefix[nerrs
-]b4_locations_if([[#define yylloc ]b4_prefix[lloc]])])[
+#define yynerrs ]b4_prefix[nerrs]b4_locations_if([[
+#define yylloc ]b4_prefix[lloc]])])[
/* Copy the first part of user declarations. */
]b4_user_pre_prologue[
-/* Enabling traces. */
-#ifndef YYDEBUG
-# define YYDEBUG ]b4_debug_flag[
-#endif
+]b4_null_define[
/* Enabling verbose error messages. */
#ifdef YYERROR_VERBOSE
# define YYERROR_VERBOSE ]b4_error_verbose_flag[
#endif
-/* Enabling the token table. */
-#ifndef YYTOKEN_TABLE
-# define YYTOKEN_TABLE ]b4_token_table[
-#endif
-
-]b4_percent_code_get([[requires]])[]dnl
-
-b4_token_enums_defines(b4_tokens)[
-
-#if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
-]m4_ifdef([b4_stype],
-[[typedef union ]b4_union_name[
-{
-]b4_user_stype[
-} YYSTYPE;
-# define YYSTYPE_IS_TRIVIAL 1]],
-[m4_if(b4_tag_seen_flag, 0,
-[[typedef int YYSTYPE;
-# define YYSTYPE_IS_TRIVIAL 1]])])[
-# define yystype YYSTYPE /* obsolescent; will be withdrawn */
-# define YYSTYPE_IS_DECLARED 1
-#endif]b4_locations_if([[
-
-#if ! defined YYLTYPE && ! defined YYLTYPE_IS_DECLARED
-typedef struct YYLTYPE
-{
- int first_line;
- int first_column;
- int last_line;
- int last_column;
-} YYLTYPE;
-# define yyltype YYLTYPE /* obsolescent; will be withdrawn */
-# define YYLTYPE_IS_DECLARED 1
-# define YYLTYPE_IS_TRIVIAL 1
-#endif]])b4_push_if([[
-
-#ifndef YYPUSH_DECLS
-# define YYPUSH_DECLS
-struct yypstate;
-typedef struct yypstate yypstate;
-enum { YYPUSH_MORE = 4 };
-
-]b4_pull_if([b4_c_function_decl([[yyparse]], [[int]], b4_parse_param)
-])b4_c_function_decl([[yypush_parse]], [[int]],
- [[[yypstate *yyps]], [[yyps]]]b4_pure_if([,
- [[[int yypushed_char]], [[yypushed_char]]],
- [[[YYSTYPE const *yypushed_val]], [[yypushed_val]]]b4_locations_if([,
- [[[YYLTYPE const *yypushed_loc]], [[yypushed_loc]]]])])m4_ifset([b4_parse_param], [,
- b4_parse_param]))
-b4_pull_if([b4_c_function_decl([[yypull_parse]], [[int]],
- [[[yypstate *yyps]], [[yyps]]]m4_ifset([b4_parse_param], [,
- b4_parse_param]))])
-b4_c_function_decl([[yypstate_new]], [[yypstate *]], [[[void]], []])
-b4_c_function_decl([[yypstate_delete]], [[void]],
- [[[yypstate *yyps]], [[yyps]]])[
-#endif]])
-
-b4_percent_code_get([[provides]])[]dnl
+]m4_ifval(m4_quote(b4_spec_defines_file),
+[[/* In a future release of Bison, this section will be replaced
+ by #include "@basename(]b4_spec_defines_file[@)". */
+]])dnl
+b4_shared_declarations[
-[/* Copy the second part of user declarations. */
+/* Copy the second part of user declarations. */
]b4_user_post_prologue
b4_percent_code_get[]dnl
}
#endif
-#if ! defined yyoverflow || YYERROR_VERBOSE
+#if ]b4_lac_if([[1]], [[! defined yyoverflow || YYERROR_VERBOSE]])[
-]b4_push_if([],
-[[/* The parser invokes alloca or malloc; define the necessary symbols. */
+/* The parser invokes alloca or malloc; define the necessary symbols. */]dnl
+b4_push_if([], [b4_lac_if([], [[
# ifdef YYSTACK_USE_ALLOCA
# if YYSTACK_USE_ALLOCA
# define alloca _alloca
# else
# define YYSTACK_ALLOC alloca
-# if ! defined _ALLOCA_H && ! defined _STDLIB_H && ]b4_c_modern[
+# if ! defined _ALLOCA_H && ! defined EXIT_SUCCESS && ]b4_c_modern[
# include <stdlib.h> /* INFRINGES ON USER NAME SPACE */
-# ifndef _STDLIB_H
-# define _STDLIB_H 1
+ /* Use EXIT_SUCCESS as a witness for stdlib.h. */
+# ifndef EXIT_SUCCESS
+# define EXIT_SUCCESS 0
# endif
# endif
# endif
# endif
-# endif
+# endif]])])[
-]])dnl
-[# ifdef YYSTACK_ALLOC
+# ifdef YYSTACK_ALLOC
/* Pacify GCC's `empty if-body' warning. */
# define YYSTACK_FREE(Ptr) do { /* empty */; } while (YYID (0))
# ifndef YYSTACK_ALLOC_MAXIMUM
# ifndef YYSTACK_ALLOC_MAXIMUM
# define YYSTACK_ALLOC_MAXIMUM YYSIZE_MAXIMUM
# endif
-# if (defined __cplusplus && ! defined _STDLIB_H \
+# if (defined __cplusplus && ! defined EXIT_SUCCESS \
&& ! ((defined YYMALLOC || defined malloc) \
&& (defined YYFREE || defined free)))
# include <stdlib.h> /* INFRINGES ON USER NAME SPACE */
-# ifndef _STDLIB_H
-# define _STDLIB_H 1
+# ifndef EXIT_SUCCESS
+# define EXIT_SUCCESS 0
# endif
# endif
# ifndef YYMALLOC
# define YYMALLOC malloc
-# if ! defined malloc && ! defined _STDLIB_H && ]b4_c_modern[
+# if ! defined malloc && ! defined EXIT_SUCCESS && ]b4_c_modern[
void *malloc (YYSIZE_T); /* INFRINGES ON USER NAME SPACE */
# endif
# endif
# ifndef YYFREE
# define YYFREE free
-# if ! defined free && ! defined _STDLIB_H && ]b4_c_modern[
+# if ! defined free && ! defined EXIT_SUCCESS && ]b4_c_modern[
void free (void *); /* INFRINGES ON USER NAME SPACE */
# endif
# endif
-# endif
-#endif /* ! defined yyoverflow || YYERROR_VERBOSE */
+# endif]b4_lac_if([[
+# define YYCOPY_NEEDED 1]])[
+#endif]b4_lac_if([], [[ /* ! defined yyoverflow || YYERROR_VERBOSE */]])[
#if (! defined yyoverflow \
&& (! defined __cplusplus \
- || (]b4_locations_if([[defined YYLTYPE_IS_TRIVIAL && YYLTYPE_IS_TRIVIAL \
- && ]])[defined YYSTYPE_IS_TRIVIAL && YYSTYPE_IS_TRIVIAL)))
+ || (]b4_locations_if([[defined ]b4_api_PREFIX[LTYPE_IS_TRIVIAL && ]b4_api_PREFIX[LTYPE_IS_TRIVIAL \
+ && ]])[defined ]b4_api_PREFIX[STYPE_IS_TRIVIAL && ]b4_api_PREFIX[STYPE_IS_TRIVIAL)))
/* A type that is properly aligned for any stack member. */
union yyalloc
((N) * (sizeof (yytype_int16) + sizeof (YYSTYPE)) \
+ YYSTACK_GAP_MAXIMUM)])[
-/* Copy COUNT objects from FROM to TO. The source and destination do
- not overlap. */
-# ifndef YYCOPY
-# if defined __GNUC__ && 1 < __GNUC__
-# define YYCOPY(To, From, Count) \
- __builtin_memcpy (To, From, (Count) * sizeof (*(From)))
-# else
-# define YYCOPY(To, From, Count) \
- do \
- { \
- YYSIZE_T yyi; \
- for (yyi = 0; yyi < (Count); yyi++) \
- (To)[yyi] = (From)[yyi]; \
- } \
- while (YYID (0))
-# endif
-# endif
+# define YYCOPY_NEEDED 1
/* Relocate STACK from its old location to the new one. The
local variables YYSIZE and YYSTACKSIZE give the old and new number of
#endif
+#if defined YYCOPY_NEEDED && YYCOPY_NEEDED
+/* Copy COUNT objects from SRC to DST. The source and destination do
+ not overlap. */
+# ifndef YYCOPY
+# if defined __GNUC__ && 1 < __GNUC__
+# define YYCOPY(Dst, Src, Count) \
+ __builtin_memcpy (Dst, Src, (Count) * sizeof (*(Src)))
+# else
+# define YYCOPY(Dst, Src, Count) \
+ do \
+ { \
+ YYSIZE_T yyi; \
+ for (yyi = 0; yyi < (Count); yyi++) \
+ (Dst)[yyi] = (Src)[yyi]; \
+ } \
+ while (YYID (0))
+# endif
+# endif
+#endif /* !YYCOPY_NEEDED */
+
/* YYFINAL -- State number of the termination state. */
#define YYFINAL ]b4_final_state_number[
/* YYLAST -- Last index in YYTABLE. */
]b4_translate[
};
-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG
/* YYPRHS[YYN] -- Index of the first RHS symbol of rule number YYN in
YYRHS. */
static const ]b4_int_type_for([b4_prhs])[ yyprhs[] =
};
#endif
-#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
+#if ]b4_api_PREFIX[DEBUG || YYERROR_VERBOSE || ]b4_token_table_flag[
/* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
First, the terminals, then, starting at YYNTOKENS, nonterminals. */
static const char *const yytname[] =
/* Like YYERROR except do call yyerror. This remains here temporarily
to ease the transition to the new meaning of YYERROR, for GCC.
- Once GCC version 2 has supplanted version 1, this can go. */
+ Once GCC version 2 has supplanted version 1, this can go. However,
+ YYFAIL appears to be in use. Nevertheless, it is formally deprecated
+ in Bison 2.4.2's NEWS entry, where a plan to phase it out is
+ discussed. */
#define YYFAIL goto yyerrlab
+#if defined YYFAIL
+ /* This is here to suppress warnings from the GCC cpp's
+ -Wunused-macros. Normally we don't worry about that warning, but
+ some users do, and we want to make it easy for users to remove
+ YYFAIL uses, which will produce warnings from Bison 2.5. */
+#endif
#define YYRECOVERING() (!!yyerrstatus)
-#define YYBACKUP(Token, Value) \
-do \
- if (yychar == YYEMPTY && yylen == 1) \
- { \
- yychar = (Token); \
- yylval = (Value); \
- yytoken = YYTRANSLATE (yychar); \
- YYPOPSTACK (1); \
- goto yybackup; \
- } \
- else \
- { \
+#define YYBACKUP(Token, Value) \
+do \
+ if (yychar == YYEMPTY) \
+ { \
+ yychar = (Token); \
+ yylval = (Value); \
+ YYPOPSTACK (yylen); \
+ yystate = *yyssp; \]b4_lac_if([[
+ YY_LAC_DISCARD ("YYBACKUP"); \]])[
+ goto yybackup; \
+ } \
+ else \
+ { \
yyerror (]b4_yyerror_args[YY_("syntax error: cannot back up")); \
YYERROR; \
} \
#define YYTERROR 1
#define YYERRCODE 256
-
-/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
- If N is 0, then set CURRENT to the empty location which ends
- the previous symbol: RHS[0] (always defined). */
-
+]b4_yylloc_default_define[
#define YYRHSLOC(Rhs, K) ((Rhs)[K])
-#ifndef YYLLOC_DEFAULT
-# define YYLLOC_DEFAULT(Current, Rhs, N) \
- do \
- if (YYID (N)) \
- { \
- (Current).first_line = YYRHSLOC (Rhs, 1).first_line; \
- (Current).first_column = YYRHSLOC (Rhs, 1).first_column; \
- (Current).last_line = YYRHSLOC (Rhs, N).last_line; \
- (Current).last_column = YYRHSLOC (Rhs, N).last_column; \
- } \
- else \
- { \
- (Current).first_line = (Current).last_line = \
- YYRHSLOC (Rhs, 0).last_line; \
- (Current).first_column = (Current).last_column = \
- YYRHSLOC (Rhs, 0).last_column; \
- } \
- while (YYID (0))
-#endif
+]b4_locations_if([[
/* YY_LOCATION_PRINT -- Print the location on the stream.
we won't break user code: when these are the locations we know. */
#ifndef YY_LOCATION_PRINT
-# if defined YYLTYPE_IS_TRIVIAL && YYLTYPE_IS_TRIVIAL
+# if defined ]b4_api_PREFIX[LTYPE_IS_TRIVIAL && ]b4_api_PREFIX[LTYPE_IS_TRIVIAL
# define YY_LOCATION_PRINT(File, Loc) \
fprintf (File, "%d.%d-%d.%d", \
(Loc).first_line, (Loc).first_column, \
# else
# define YY_LOCATION_PRINT(File, Loc) ((void) 0)
# endif
-#endif
+#endif]], [[
+
+
+/* This macro is provided for backward compatibility. */
+
+#ifndef YY_LOCATION_PRINT
+# define YY_LOCATION_PRINT(File, Loc) ((void) 0)
+#endif]])[
/* YYLEX -- calling `yylex' with the right arguments. */
#endif
/* Enable debugging if requested. */
-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG
# ifndef YYFPRINTF
# include <stdio.h> /* INFRINGES ON USER NAME SPACE */
/* Nonzero means print parse trace. It is left uninitialized so that
multiple parsers can coexist. */
int yydebug;
-#else /* !YYDEBUG */
+#else /* !]b4_api_PREFIX[DEBUG */
# define YYDPRINTF(Args)
# define YY_SYMBOL_PRINT(Title, Type, Value, Location)
# define YY_STACK_PRINT(Bottom, Top)
# define YY_REDUCE_PRINT(Rule)
-#endif /* !YYDEBUG */
+#endif /* !]b4_api_PREFIX[DEBUG */
/* YYINITDEPTH -- initial size of the parser's stacks. */
#ifndef YYMAXDEPTH
# define YYMAXDEPTH ]b4_stack_depth_max[
+#endif]b4_lac_if([[
+
+/* Given a state stack such that *YYBOTTOM is its bottom, such that
+ *YYTOP is either its top or is YYTOP_EMPTY to indicate an empty
+ stack, and such that *YYCAPACITY is the maximum number of elements it
+ can hold without a reallocation, make sure there is enough room to
+ store YYADD more elements. If not, allocate a new stack using
+ YYSTACK_ALLOC, copy the existing elements, and adjust *YYBOTTOM,
+ *YYTOP, and *YYCAPACITY to reflect the new capacity and memory
+ location. If *YYBOTTOM != YYBOTTOM_NO_FREE, then free the old stack
+ using YYSTACK_FREE. Return 0 if successful or if no reallocation is
+ required. Return 1 if memory is exhausted. */
+static int
+yy_lac_stack_realloc (YYSIZE_T *yycapacity, YYSIZE_T yyadd,
+#if ]b4_api_PREFIX[DEBUG
+ char const *yydebug_prefix,
+ char const *yydebug_suffix,
#endif
+ yytype_int16 **yybottom,
+ yytype_int16 *yybottom_no_free,
+ yytype_int16 **yytop, yytype_int16 *yytop_empty)
+{
+ YYSIZE_T yysize_old =
+ *yytop == yytop_empty ? 0 : *yytop - *yybottom + 1;
+ YYSIZE_T yysize_new = yysize_old + yyadd;
+ if (*yycapacity < yysize_new)
+ {
+ YYSIZE_T yyalloc = 2 * yysize_new;
+ yytype_int16 *yybottom_new;
+ /* Use YYMAXDEPTH for maximum stack size given that the stack
+ should never need to grow larger than the main state stack
+ needs to grow without LAC. */
+ if (YYMAXDEPTH < yysize_new)
+ {
+ YYDPRINTF ((stderr, "%smax size exceeded%s", yydebug_prefix,
+ yydebug_suffix));
+ return 1;
+ }
+ if (YYMAXDEPTH < yyalloc)
+ yyalloc = YYMAXDEPTH;
+ yybottom_new =
+ (yytype_int16*) YYSTACK_ALLOC (yyalloc * sizeof *yybottom_new);
+ if (!yybottom_new)
+ {
+ YYDPRINTF ((stderr, "%srealloc failed%s", yydebug_prefix,
+ yydebug_suffix));
+ return 1;
+ }
+ if (*yytop != yytop_empty)
+ {
+ YYCOPY (yybottom_new, *yybottom, yysize_old);
+ *yytop = yybottom_new + (yysize_old - 1);
+ }
+ if (*yybottom != yybottom_no_free)
+ YYSTACK_FREE (*yybottom);
+ *yybottom = yybottom_new;
+ *yycapacity = yyalloc;]m4_if(b4_percent_define_get([[parse.lac.memory-trace]]),
+ [full], [[
+ YYDPRINTF ((stderr, "%srealloc to %lu%s", yydebug_prefix,
+ (unsigned long int) yyalloc, yydebug_suffix));]])[
+ }
+ return 0;
+}
+
+/* Establish the initial context for the current lookahead if no initial
+ context is currently established.
+
+ We define a context as a snapshot of the parser stacks. We define
+ the initial context for a lookahead as the context in which the
+ parser initially examines that lookahead in order to select a
+ syntactic action. Thus, if the lookahead eventually proves
+ syntactically unacceptable (possibly in a later context reached via a
+ series of reductions), the initial context can be used to determine
+ the exact set of tokens that would be syntactically acceptable in the
+ lookahead's place. Moreover, it is the context after which any
+ further semantic actions would be erroneous because they would be
+ determined by a syntactically unacceptable token.
+
+ YY_LAC_ESTABLISH should be invoked when a reduction is about to be
+ performed in an inconsistent state (which, for the purposes of LAC,
+ includes consistent states that don't know they're consistent because
+ their default reductions have been disabled). Iff there is a
+ lookahead token, it should also be invoked before reporting a syntax
+ error. This latter case is for the sake of the debugging output.
+
+ For parse.lac=full, the implementation of YY_LAC_ESTABLISH is as
+ follows. If no initial context is currently established for the
+ current lookahead, then check if that lookahead can eventually be
+ shifted if syntactic actions continue from the current context.
+ Report a syntax error if it cannot. */
+#define YY_LAC_ESTABLISH \
+do { \
+ if (!yy_lac_established) \
+ { \
+ YYDPRINTF ((stderr, \
+ "LAC: initial context established for %s\n", \
+ yytname[yytoken])); \
+ yy_lac_established = 1; \
+ { \
+ int yy_lac_status = \
+ yy_lac (yyesa, &yyes, &yyes_capacity, yyssp, yytoken); \
+ if (yy_lac_status == 2) \
+ goto yyexhaustedlab; \
+ if (yy_lac_status == 1) \
+ goto yyerrlab; \
+ } \
+ } \
+} while (YYID (0))
+
+/* Discard any previous initial lookahead context because of Event,
+ which may be a lookahead change or an invalidation of the currently
+ established initial context for the current lookahead.
+
+ The most common example of a lookahead change is a shift. An example
+ of both cases is syntax error recovery. That is, a syntax error
+ occurs when the lookahead is syntactically erroneous for the
+ currently established initial context, so error recovery manipulates
+ the parser stacks to try to find a new initial context in which the
+ current lookahead is syntactically acceptable. If it fails to find
+ such a context, it discards the lookahead. */
+#if ]b4_api_PREFIX[DEBUG
+# define YY_LAC_DISCARD(Event) \
+do { \
+ if (yy_lac_established) \
+ { \
+ if (yydebug) \
+ YYFPRINTF (stderr, "LAC: initial context discarded due to " \
+ Event "\n"); \
+ yy_lac_established = 0; \
+ } \
+} while (YYID (0))
+#else
+# define YY_LAC_DISCARD(Event) yy_lac_established = 0
+#endif
+
+/* Given the stack whose top is *YYSSP, return 0 iff YYTOKEN can
+ eventually (after perhaps some reductions) be shifted, return 1 if
+ not, or return 2 if memory is exhausted. As preconditions and
+ postconditions: *YYES_CAPACITY is the allocated size of the array to
+ which *YYES points, and either *YYES = YYESA or *YYES points to an
+ array allocated with YYSTACK_ALLOC. yy_lac may overwrite the
+ contents of either array, alter *YYES and *YYES_CAPACITY, and free
+ any old *YYES other than YYESA. */
+static int
+yy_lac (yytype_int16 *yyesa, yytype_int16 **yyes,
+ YYSIZE_T *yyes_capacity, yytype_int16 *yyssp, int yytoken)
+{
+ yytype_int16 *yyes_prev = yyssp;
+ yytype_int16 *yyesp = yyes_prev;
+ YYDPRINTF ((stderr, "LAC: checking lookahead %s:", yytname[yytoken]));
+ if (yytoken == YYUNDEFTOK)
+ {
+ YYDPRINTF ((stderr, " Always Err\n"));
+ return 1;
+ }
+ while (1)
+ {
+ int yyrule = yypact[*yyesp];
+ if (yypact_value_is_default (yyrule)
+ || (yyrule += yytoken) < 0 || YYLAST < yyrule
+ || yycheck[yyrule] != yytoken)
+ {
+ yyrule = yydefact[*yyesp];
+ if (yyrule == 0)
+ {
+ YYDPRINTF ((stderr, " Err\n"));
+ return 1;
+ }
+ }
+ else
+ {
+ yyrule = yytable[yyrule];
+ if (yytable_value_is_error (yyrule))
+ {
+ YYDPRINTF ((stderr, " Err\n"));
+ return 1;
+ }
+ if (0 < yyrule)
+ {
+ YYDPRINTF ((stderr, " S%d\n", yyrule));
+ return 0;
+ }
+ yyrule = -yyrule;
+ }
+ {
+ YYSIZE_T yylen = yyr2[yyrule];
+ YYDPRINTF ((stderr, " R%d", yyrule - 1));
+ if (yyesp != yyes_prev)
+ {
+ YYSIZE_T yysize = yyesp - *yyes + 1;
+ if (yylen < yysize)
+ {
+ yyesp -= yylen;
+ yylen = 0;
+ }
+ else
+ {
+ yylen -= yysize;
+ yyesp = yyes_prev;
+ }
+ }
+ if (yylen)
+ yyesp = yyes_prev -= yylen;
+ }
+ {
+ int yystate;
+ {
+ int yylhs = yyr1[yyrule] - YYNTOKENS;
+ yystate = yypgoto[yylhs] + *yyesp;
+ if (yystate < 0 || YYLAST < yystate
+ || yycheck[yystate] != *yyesp)
+ yystate = yydefgoto[yylhs];
+ else
+ yystate = yytable[yystate];
+ }
+ if (yyesp == yyes_prev)
+ {
+ yyesp = *yyes;
+ *yyesp = yystate;
+ }
+ else
+ {
+ if (yy_lac_stack_realloc (yyes_capacity, 1,
+#if ]b4_api_PREFIX[DEBUG
+ " (", ")",
+#endif
+ yyes, yyesa, &yyesp, yyes_prev))
+ {
+ YYDPRINTF ((stderr, "\n"));
+ return 2;
+ }
+ *++yyesp = yystate;
+ }
+ YYDPRINTF ((stderr, " G%d", yystate));
+ }
+ }
+}]])[
-\f
#if YYERROR_VERBOSE
# endif
/* Copy into *YYMSG, which is of size *YYMSG_ALLOC, an error message
- about the unexpected token YYTOKEN while in state YYSTATE.
-
- Return 0 if *YYMSG was successfully written. Return 1 if an ordinary
- "syntax error" message will suffice instead. Return 2 if *YYMSG is
- not large enough to hold the message. In the last case, also set
- *YYMSG_ALLOC to either (a) the required number of bytes or (b) zero
- if the required number of bytes is too large to store. */
+ about the unexpected token YYTOKEN for the state stack whose top is
+ YYSSP.]b4_lac_if([[ In order to see if a particular token T is a
+ valid looakhead, invoke yy_lac (YYESA, YYES, YYES_CAPACITY, YYSSP, T).]])[
+
+ Return 0 if *YYMSG was successfully written. Return 1 if *YYMSG is
+ not large enough to hold the message. In that case, also set
+ *YYMSG_ALLOC to the required number of bytes. Return 2 if the
+ required number of bytes is too large to store]b4_lac_if([[ or if
+ yy_lac returned 2]])[. */
static int
yysyntax_error (YYSIZE_T *yymsg_alloc, char **yymsg,
- int yystate, int yytoken)
+ ]b4_lac_if([[yytype_int16 *yyesa, yytype_int16 **yyes,
+ YYSIZE_T *yyes_capacity, ]])[yytype_int16 *yyssp, int yytoken)
{
- int yyn = yypact[yystate];
-
- if (! (YYPACT_NINF < yyn && yyn <= YYLAST))
- return 1;
- else
+ YYSIZE_T yysize0 = yytnamerr (YY_NULL, yytname[yytoken]);
+ YYSIZE_T yysize = yysize0;
+ YYSIZE_T yysize1;
+ enum { YYERROR_VERBOSE_ARGS_MAXIMUM = 5 };
+ /* Internationalized format string. */
+ const char *yyformat = YY_NULL;
+ /* Arguments of yyformat. */
+ char const *yyarg[YYERROR_VERBOSE_ARGS_MAXIMUM];
+ /* Number of reported tokens (one for the "unexpected", one per
+ "expected"). */
+ int yycount = 0;
+
+ /* There are many possibilities here to consider:
+ - Assume YYFAIL is not used. It's too flawed to consider. See
+ <http://lists.gnu.org/archive/html/bison-patches/2009-12/msg00024.html>
+ for details. YYERROR is fine as it does not invoke this
+ function.
+ - If this state is a consistent state with a default action, then
+ the only way this function was invoked is if the default action
+ is an error action. In that case, don't check for expected
+ tokens because there are none.
+ - The only way there can be no lookahead present (in yychar) is if
+ this state is a consistent state with a default action. Thus,
+ detecting the absence of a lookahead is sufficient to determine
+ that there is no unexpected or expected token to report. In that
+ case, just report a simple "syntax error".
+ - Don't assume there isn't a lookahead just because this state is a
+ consistent state with a default action. There might have been a
+ previous inconsistent state, consistent state with a non-default
+ action, or user semantic action that manipulated yychar.]b4_lac_if([[
+ In the first two cases, it might appear that the current syntax
+ error should have been detected in the previous state when yy_lac
+ was invoked. However, at that time, there might have been a
+ different syntax error that discarded a different initial context
+ during error recovery, leaving behind the current lookahead.]], [[
+ - Of course, the expected token list depends on states to have
+ correct lookahead information, and it depends on the parser not
+ to perform extra reductions after fetching a lookahead from the
+ scanner and before detecting a syntax error. Thus, state merging
+ (from LALR or IELR) and default reductions corrupt the expected
+ token list. However, the list is correct for canonical LR with
+ one exception: it will still contain any token that will not be
+ accepted due to an error action in a later state.]])[
+ */
+ if (yytoken != YYEMPTY)
{
- YYSIZE_T yysize0 = yytnamerr (0, yytname[yytoken]);
- YYSIZE_T yysize = yysize0;
- YYSIZE_T yysize1;
- enum { YYERROR_VERBOSE_ARGS_MAXIMUM = 5 };
- /* Internationalized format string. */
- const char *yyformat = 0;
- /* Arguments of yyformat. */
- char const *yyarg[YYERROR_VERBOSE_ARGS_MAXIMUM];
-
- /* Start YYX at -YYN if negative to avoid negative indexes in
- YYCHECK. In other words, skip the first -YYN actions for this
- state because they are default actions. */
- int yyxbegin = yyn < 0 ? -yyn : 0;
-
- /* Stay within bounds of both yycheck and yytname. */
- int yychecklim = YYLAST - yyn + 1;
- int yyxend = yychecklim < YYNTOKENS ? yychecklim : YYNTOKENS;
- /* Number of reported tokens (one for the "unexpected", one per
- "expected"). */
- int yycount = 0;
- int yyx;
-
+ int yyn = yypact[*yyssp];]b4_lac_if([[
+ YYDPRINTF ((stderr, "Constructing syntax error message\n"));]])[
yyarg[yycount++] = yytname[yytoken];
+ if (!yypact_value_is_default (yyn))
+ {]b4_lac_if([], [[
+ /* Start YYX at -YYN if negative to avoid negative indexes in
+ YYCHECK. In other words, skip the first -YYN actions for
+ this state because they are default actions. */
+ int yyxbegin = yyn < 0 ? -yyn : 0;
+ /* Stay within bounds of both yycheck and yytname. */
+ int yychecklim = YYLAST - yyn + 1;
+ int yyxend = yychecklim < YYNTOKENS ? yychecklim : YYNTOKENS;]])[
+ int yyx;]b4_lac_if([[
+
+ for (yyx = 0; yyx < YYNTOKENS; ++yyx)
+ if (yyx != YYTERROR && yyx != YYUNDEFTOK)
+ {
+ {
+ int yy_lac_status = yy_lac (yyesa, yyes, yyes_capacity,
+ yyssp, yyx);
+ if (yy_lac_status == 2)
+ return 2;
+ if (yy_lac_status == 1)
+ continue;
+ }]], [[
+
+ for (yyx = yyxbegin; yyx < yyxend; ++yyx)
+ if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR
+ && !yytable_value_is_error (yytable[yyx + yyn]))
+ {]])[
+ if (yycount == YYERROR_VERBOSE_ARGS_MAXIMUM)
+ {
+ yycount = 1;
+ yysize = yysize0;
+ break;
+ }
+ yyarg[yycount++] = yytname[yyx];
+ yysize1 = yysize + yytnamerr (YY_NULL, yytname[yyx]);
+ if (! (yysize <= yysize1
+ && yysize1 <= YYSTACK_ALLOC_MAXIMUM))
+ return 2;
+ yysize = yysize1;
+ }
+ }]b4_lac_if([[
+# if ]b4_api_PREFIX[DEBUG
+ else if (yydebug)
+ YYFPRINTF (stderr, "No expected tokens.\n");
+# endif]])[
+ }
- for (yyx = yyxbegin; yyx < yyxend; ++yyx)
- if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR
- && !yytable_value_is_error (yytable[yyx + yyn]))
- {
- if (yycount == YYERROR_VERBOSE_ARGS_MAXIMUM)
- {
- yycount = 1;
- yysize = yysize0;
- break;
- }
- yyarg[yycount++] = yytname[yyx];
- yysize1 = yysize + yytnamerr (0, yytname[yyx]);
- if (! (yysize <= yysize1
- && yysize1 <= YYSTACK_ALLOC_MAXIMUM))
- {
- /* Overflow. */
- *yymsg_alloc = 0;
- return 2;
- }
- yysize = yysize1;
- }
+ switch (yycount)
+ {
+# define YYCASE_(N, S) \
+ case N: \
+ yyformat = S; \
+ break
+ YYCASE_(0, YY_("syntax error"));
+ YYCASE_(1, YY_("syntax error, unexpected %s"));
+ YYCASE_(2, YY_("syntax error, unexpected %s, expecting %s"));
+ YYCASE_(3, YY_("syntax error, unexpected %s, expecting %s or %s"));
+ YYCASE_(4, YY_("syntax error, unexpected %s, expecting %s or %s or %s"));
+ YYCASE_(5, YY_("syntax error, unexpected %s, expecting %s or %s or %s or %s"));
+# undef YYCASE_
+ }
- switch (yycount)
- {
-#define YYCASE_(N, S) \
- case N: \
- yyformat = S; \
- break
- YYCASE_(1, YY_("syntax error, unexpected %s"));
- YYCASE_(2, YY_("syntax error, unexpected %s, expecting %s"));
- YYCASE_(3, YY_("syntax error, unexpected %s, expecting %s or %s"));
- YYCASE_(4, YY_("syntax error, unexpected %s, expecting %s or %s or %s"));
- YYCASE_(5, YY_("syntax error, unexpected %s, expecting %s or %s or %s or %s"));
-#undef YYCASE_
- }
+ yysize1 = yysize + yystrlen (yyformat);
+ if (! (yysize <= yysize1 && yysize1 <= YYSTACK_ALLOC_MAXIMUM))
+ return 2;
+ yysize = yysize1;
+
+ if (*yymsg_alloc < yysize)
+ {
+ *yymsg_alloc = 2 * yysize;
+ if (! (yysize <= *yymsg_alloc
+ && *yymsg_alloc <= YYSTACK_ALLOC_MAXIMUM))
+ *yymsg_alloc = YYSTACK_ALLOC_MAXIMUM;
+ return 1;
+ }
- yysize1 = yysize + yystrlen (yyformat);
- if (! (yysize <= yysize1 && yysize1 <= YYSTACK_ALLOC_MAXIMUM))
+ /* Avoid sprintf, as that infringes on the user's name space.
+ Don't have undefined behavior even if the translation
+ produced a string with the wrong number of "%s"s. */
+ {
+ char *yyp = *yymsg;
+ int yyi = 0;
+ while ((*yyp = *yyformat) != '\0')
+ if (*yyp == '%' && yyformat[1] == 's' && yyi < yycount)
{
- /* Overflow. */
- *yymsg_alloc = 0;
- return 2;
+ yyp += yytnamerr (yyp, yyarg[yyi++]);
+ yyformat += 2;
}
- yysize = yysize1;
-
- if (*yymsg_alloc < yysize)
+ else
{
- *yymsg_alloc = 2 * yysize;
- if (! (yysize <= *yymsg_alloc
- && *yymsg_alloc <= YYSTACK_ALLOC_MAXIMUM))
- *yymsg_alloc = YYSTACK_ALLOC_MAXIMUM;
- return 2;
+ yyp++;
+ yyformat++;
}
-
- /* Avoid sprintf, as that infringes on the user's name space.
- Don't have undefined behavior even if the translation
- produced a string with the wrong number of "%s"s. */
- {
- char *yyp = *yymsg;
- int yyi = 0;
- while ((*yyp = *yyformat) != '\0')
- if (*yyp == '%' && yyformat[1] == 's' && yyi < yycount)
- {
- yyp += yytnamerr (yyp, yyarg[yyi++]);
- yyformat += 2;
- }
- else
- {
- yyp++;
- yyformat++;
- }
- }
- return 0;
- }
+ }
+ return 0;
}
#endif /* YYERROR_VERBOSE */
-\f
-]b4_yydestruct_generate([b4_c_function_def])b4_push_if([], [[
+]b4_yydestruct_generate([b4_c_function_def])[
-
-/* Prevent warnings from -Wmissing-prototypes. */
-#ifdef YYPARSE_PARAM
-]b4_c_function_decl([yyparse], [int],
- [[void *YYPARSE_PARAM], [YYPARSE_PARAM]])[
-#else /* ! YYPARSE_PARAM */
-]b4_c_function_decl([yyparse], [int], b4_parse_param)[
-#endif /* ! YYPARSE_PARAM */]])b4_pure_if([], [
+]b4_pure_if([], [
b4_declare_scanner_communication_variables])[]b4_push_if([[
-
struct yypstate
{]b4_declare_parser_state_variables[
/* Used to determine if this is the first time this instance has
b4_c_function_def([[yyparse]], [[int]], b4_parse_param)[
{
- return yypull_parse (0]m4_ifset([b4_parse_param],
+ return yypull_parse (YY_NULL]m4_ifset([b4_parse_param],
[[, ]b4_c_args(b4_parse_param)])[);
}
int yychar;
YYSTYPE yylval;]b4_locations_if([[
YYLTYPE yylloc;]])])[
- if (yyps == 0)
+ if (yyps)
+ yyps_local = yyps;
+ else
{
yyps_local = yypstate_new ();
if (!yyps_local)
return 2;
}
}
- else
- yyps_local = yyps;
do {
yychar = YYLEX;
yystatus =
yypush_parse (yyps_local]b4_pure_if([[, yychar, &yylval]b4_locations_if([[, &yylloc]])])m4_ifset([b4_parse_param], [, b4_c_args(b4_parse_param)])[);
} while (yystatus == YYPUSH_MORE);
- if (yyps == 0)
+ if (!yyps)
yypstate_delete (yyps_local);
return yystatus;
}]])[
{
yypstate *yyps;]b4_pure_if([], [[
if (yypstate_allocated)
- return 0;]])[
+ return YY_NULL;]])[
yyps = (yypstate *) malloc (sizeof *yyps);
if (!yyps)
- return 0;
+ return YY_NULL;
yyps->yynew = 1;]b4_pure_if([], [[
yypstate_allocated = 1;]])[
return yyps;
stack still needs to be freed. */
if (!yyps->yynew && yyps->yyss != yyps->yyssa)
YYSTACK_FREE (yyps->yyss);
-#endif
+#endif]b4_lac_if([[
+ if (!yyps->yynew && yyps->yyes != yyps->yyesa)
+ YYSTACK_FREE (yyps->yyes);]])[
free (yyps);]b4_pure_if([], [[
yypstate_allocated = 0;]])[
}
#define yyls yyps->yyls
#define yylsp yyps->yylsp
#define yyerror_range yyps->yyerror_range]])[
-#define yystacksize yyps->yystacksize
+#define yystacksize yyps->yystacksize]b4_lac_if([[
+#define yyesa yyps->yyesa
+#define yyes yyps->yyes
+#define yyes_capacity yyps->yyes_capacity]])[
/*---------------.
YYLTYPE yypushed_loc = yylloc;]])
])],
[b4_declare_parser_state_variables
-])[
+])b4_lac_if([[
+ int yy_lac_established = 0;]])[
int yyn;
int yyresult;
/* Lookahead token as an internal (translated) token number. */
- int yytoken;
+ int yytoken = 0;
/* The variables used to return semantic value and location from the
action routines. */
YYSTYPE yyval;]b4_locations_if([[
goto yyread_pushed_token;
}]])[
- yytoken = 0;
yyss = yyssa;
yyvs = yyvsa;]b4_locations_if([[
yyls = yylsa;]])[
- yystacksize = YYINITDEPTH;
+ yystacksize = YYINITDEPTH;]b4_lac_if([[
+
+ yyes = yyesa;
+ yyes_capacity = sizeof yyesa / sizeof *yyes;
+ if (YYMAXDEPTH < yyes_capacity)
+ yyes_capacity = YYMAXDEPTH;]])[
YYDPRINTF ((stderr, "Starting parse\n"));
yyvsp = yyvs;]b4_locations_if([[
yylsp = yyls;
-#if defined YYLTYPE_IS_TRIVIAL && YYLTYPE_IS_TRIVIAL
+#if defined ]b4_api_PREFIX[LTYPE_IS_TRIVIAL && ]b4_api_PREFIX[LTYPE_IS_TRIVIAL
/* Initialize the default location before parsing starts. */
yylloc.first_line = yylloc.last_line = ]b4_location_initial_line[;
yylloc.first_column = yylloc.last_column = ]b4_location_initial_column[;
#endif]])
m4_ifdef([b4_initial_action],[
-m4_pushdef([b4_at_dollar], [m4_define([b4_at_dollar_used])yylloc])dnl
-m4_pushdef([b4_dollar_dollar], [m4_define([b4_dollar_dollar_used])yylval])dnl
+b4_dollar_pushdef([m4_define([b4_dollar_dollar_used])yylval], [],
+ [m4_define([b4_at_dollar_used])yylloc])dnl
/* User initialization code. */
b4_user_initial_action
-m4_popdef([b4_dollar_dollar])dnl
-m4_popdef([b4_at_dollar])])dnl
+b4_dollar_popdef[]dnl
m4_ifdef([b4_dollar_dollar_used],[[ yyvsp[0] = yylval;
]])dnl
m4_ifdef([b4_at_dollar_used], [[ yylsp[0] = yylloc;
-]])[
- goto yysetstate;
+]])])dnl
+[ goto yysetstate;
/*------------------------------------------------------------.
| yynewstate -- Push a new state, which is found in yystate. |
/* If the proper action on seeing token YYTOKEN is to reduce or to
detect an error, take that action. */
yyn += yytoken;
- if (yyn < 0 || YYLAST < yyn || yycheck[yyn] != yytoken)
- goto yydefault;
+ if (yyn < 0 || YYLAST < yyn || yycheck[yyn] != yytoken)]b4_lac_if([[
+ {
+ YY_LAC_ESTABLISH;
+ goto yydefault;
+ }]], [[
+ goto yydefault;]])[
yyn = yytable[yyn];
if (yyn <= 0)
{
if (yytable_value_is_error (yyn))
- goto yyerrlab;
+ goto yyerrlab;]b4_lac_if([[
+ YY_LAC_ESTABLISH;]])[
yyn = -yyn;
goto yyreduce;
}
YY_SYMBOL_PRINT ("Shifting", yytoken, &yylval, &yylloc);
/* Discard the shifted token. */
- yychar = YYEMPTY;
+ yychar = YYEMPTY;]b4_lac_if([[
+ YY_LAC_DISCARD ("shift");]])[
yystate = yyn;
*++yyvsp = yylval;
]b4_locations_if(
[[ /* Default location. */
YYLLOC_DEFAULT (yyloc, (yylsp - yylen), yylen);]])[
- YY_REDUCE_PRINT (yyn);
+ YY_REDUCE_PRINT (yyn);]b4_lac_if([[
+ {
+ int yychar_backup = yychar;
+ switch (yyn)
+ {
+ ]b4_user_actions[
+ default: break;
+ }
+ if (yychar_backup != yychar)
+ YY_LAC_DISCARD ("yychar change");
+ }]], [[
switch (yyn)
{
]b4_user_actions[
default: break;
- }
+ }]])[
+ /* User semantic actions sometimes alter yychar, and that requires
+ that yytoken be updated with the new translation. We take the
+ approach of translating immediately before every use of yytoken.
+ One alternative is translating here after every semantic action,
+ but that translation would be missed if the semantic action invokes
+ YYABORT, YYACCEPT, or YYERROR immediately after altering yychar or
+ if it invokes YYBACKUP. In the case of YYABORT or YYACCEPT, an
+ incorrect destructor might then be invoked immediately. In the
+ case of YYERROR or YYBACKUP, subsequent parser actions might lead
+ to an incorrect destructor call or verbose syntax error message
+ before the lookahead is translated. */
YY_SYMBOL_PRINT ("-> $$ =", yyr1[yyn], &yyval, &yyloc);
YYPOPSTACK (yylen);
| yyerrlab -- here on detecting error |
`------------------------------------*/
yyerrlab:
+ /* Make sure we have latest lookahead translation. See comments at
+ user semantic actions for why this is necessary. */
+ yytoken = yychar == YYEMPTY ? YYEMPTY : YYTRANSLATE (yychar);
+
/* If not already recovering from an error, report this error. */
if (!yyerrstatus)
{
#if ! YYERROR_VERBOSE
yyerror (]b4_yyerror_args[YY_("syntax error"));
#else
- while (1)
- {
- int yysyntax_error_status =
- yysyntax_error (&yymsg_alloc, &yymsg, yystate, yytoken);
- if (yysyntax_error_status == 2 && 0 < yymsg_alloc)
- {
- if (yymsg != yymsgbuf)
- YYSTACK_FREE (yymsg);
- yymsg = (char *) YYSTACK_ALLOC (yymsg_alloc);
- if (yymsg)
- continue;
- yymsg = yymsgbuf;
- yymsg_alloc = sizeof yymsgbuf;
- }
- if (yysyntax_error_status == 0)
- yyerror (]b4_yyerror_args[yymsg);
- else
- yyerror (]b4_yyerror_args[YY_("syntax error"));
- if (yysyntax_error_status == 2)
- goto yyexhaustedlab;
- break;
- }
+# define YYSYNTAX_ERROR yysyntax_error (&yymsg_alloc, &yymsg, \]b4_lac_if([[
+ yyesa, &yyes, &yyes_capacity, \]])[
+ yyssp, yytoken)
+ {
+ char const *yymsgp = YY_("syntax error");
+ int yysyntax_error_status;]b4_lac_if([[
+ if (yychar != YYEMPTY)
+ YY_LAC_ESTABLISH;]])[
+ yysyntax_error_status = YYSYNTAX_ERROR;
+ if (yysyntax_error_status == 0)
+ yymsgp = yymsg;
+ else if (yysyntax_error_status == 1)
+ {
+ if (yymsg != yymsgbuf)
+ YYSTACK_FREE (yymsg);
+ yymsg = (char *) YYSTACK_ALLOC (yymsg_alloc);
+ if (!yymsg)
+ {
+ yymsg = yymsgbuf;
+ yymsg_alloc = sizeof yymsgbuf;
+ yysyntax_error_status = 2;
+ }
+ else
+ {
+ yysyntax_error_status = YYSYNTAX_ERROR;
+ yymsgp = yymsg;
+ }
+ }
+ yyerror (]b4_yyerror_args[yymsgp);
+ if (yysyntax_error_status == 2)
+ goto yyexhaustedlab;
+ }
+# undef YYSYNTAX_ERROR
#endif
}
-]b4_locations_if([[ yyerror_range[0] = yylloc;]])[
+]b4_locations_if([[ yyerror_range[1] = yylloc;]])[
if (yyerrstatus == 3)
{
if (/*CONSTCOND*/ 0)
goto yyerrorlab;
-]b4_locations_if([[ yyerror_range[0] = yylsp[1-yylen];
+]b4_locations_if([[ yyerror_range[1] = yylsp[1-yylen];
]])[ /* Do not reclaim the symbols of the rule which action triggered
this YYERROR. */
YYPOPSTACK (yylen);
if (yyssp == yyss)
YYABORT;
-]b4_locations_if([[ yyerror_range[0] = *yylsp;]])[
+]b4_locations_if([[ yyerror_range[1] = *yylsp;]])[
yydestruct ("Error: popping",
yystos[yystate], yyvsp]b4_locations_if([, yylsp])[]b4_user_args[);
YYPOPSTACK (1);
yystate = *yyssp;
YY_STACK_PRINT (yyss, yyssp);
- }
+ }]b4_lac_if([[
+
+ /* If the stack popping above didn't lose the initial context for the
+ current lookahead token, the shift below will for sure. */
+ YY_LAC_DISCARD ("error recovery");]])[
*++yyvsp = yylval;
]b4_locations_if([[
- yyerror_range[1] = yylloc;
+ yyerror_range[2] = yylloc;
/* Using YYLLOC is tempting, but would change the location of
the lookahead. YYLOC is available though. */
- YYLLOC_DEFAULT (yyloc, (yyerror_range - 1), 2);
+ YYLLOC_DEFAULT (yyloc, yyerror_range, 2);
*++yylsp = yyloc;]])[
/* Shift the error token. */
yyresult = 1;
goto yyreturn;
-#if !defined(yyoverflow) || YYERROR_VERBOSE
+#if ]b4_lac_if([[1]], [[!defined yyoverflow || YYERROR_VERBOSE]])[
/*-------------------------------------------------.
| yyexhaustedlab -- memory exhaustion comes here. |
`-------------------------------------------------*/
yyreturn:
if (yychar != YYEMPTY)
- yydestruct ("Cleanup: discarding lookahead",
- yytoken, &yylval]b4_locations_if([, &yylloc])[]b4_user_args[);
+ {
+ /* Make sure we have latest lookahead translation. See comments at
+ user semantic actions for why this is necessary. */
+ yytoken = YYTRANSLATE (yychar);
+ yydestruct ("Cleanup: discarding lookahead",
+ yytoken, &yylval]b4_locations_if([, &yylloc])[]b4_user_args[);
+ }
/* Do not reclaim the symbols of the rule which action triggered
this YYABORT or YYACCEPT. */
YYPOPSTACK (yylen);
#ifndef yyoverflow
if (yyss != yyssa)
YYSTACK_FREE (yyss);
-#endif]b4_push_if([[
+#endif]b4_lac_if([[
+ if (yyes != yyesa)
+ YYSTACK_FREE (yyes);]])b4_push_if([[
yyps->yynew = 1;
yypushreturn:]])[
}
-]b4_epilogue
+]b4_epilogue[]dnl
b4_defines_if(
[@output(b4_spec_defines_file@)@
-b4_copyright([Skeleton interface for Bison's Yacc-like parsers in C],
- [1984, 1989, 1990, 2000, 2001, 2002, 2003, 2004, 2005,
- 2006, 2007, 2008, 2009])
-
-b4_percent_code_get([[requires]])[]dnl
-
-b4_token_enums_defines(b4_tokens)
-
-[#if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
-]m4_ifdef([b4_stype],
-[[typedef union ]b4_union_name[
-{
-]b4_user_stype[
-} YYSTYPE;
-# define YYSTYPE_IS_TRIVIAL 1]],
-[m4_if(b4_tag_seen_flag, 0,
-[[typedef int YYSTYPE;
-# define YYSTYPE_IS_TRIVIAL 1]])])[
-# define yystype YYSTYPE /* obsolescent; will be withdrawn */
-# define YYSTYPE_IS_DECLARED 1
-#endif
+b4_copyright([Bison interface for Yacc-like parsers in C],
+ [1984, 1989-1990, 2000-2012])[
-]b4_pure_if([], [[extern YYSTYPE ]b4_prefix[lval;]])
-
-b4_locations_if(
-[#if ! defined YYLTYPE && ! defined YYLTYPE_IS_DECLARED
-typedef struct YYLTYPE
-{
- int first_line;
- int first_column;
- int last_line;
- int last_column;
-} YYLTYPE;
-# define yyltype YYLTYPE /* obsolescent; will be withdrawn */
-# define YYLTYPE_IS_DECLARED 1
-# define YYLTYPE_IS_TRIVIAL 1
-#endif
-
-]b4_pure_if([], [[extern YYLTYPE ]b4_prefix[lloc;]])
-)dnl b4_locations_if
-b4_push_if([[
-#ifndef YYPUSH_DECLS
-# define YYPUSH_DECLS
-struct ]b4_prefix[pstate;
-typedef struct ]b4_prefix[pstate ]b4_prefix[pstate;
-enum { YYPUSH_MORE = 4 };
-]b4_pull_if([b4_c_function_decl([b4_prefix[parse]], [[int]], b4_parse_param)
-])b4_c_function_decl([b4_prefix[push_parse]], [[int]],
- [[b4_prefix[pstate *yyps]], [[yyps]]]b4_pure_if([,
- [[[int yypushed_char]], [[yypushed_char]]],
- [[[YYSTYPE const *yypushed_val]], [[yypushed_val]]]b4_locations_if([,
- [[[YYLTYPE const *yypushed_loc]], [[yypushed_loc]]]])])m4_ifset([b4_parse_param], [,
- b4_parse_param]))
-b4_pull_if([b4_c_function_decl([b4_prefix[pull_parse]], [[int]],
- [[b4_prefix[pstate *yyps]], [[yyps]]]m4_ifset([b4_parse_param], [,
- b4_parse_param]))])
-b4_c_function_decl([b4_prefix[pstate_new]], [b4_prefix[pstate *]],
- [[[void]], []])
-b4_c_function_decl([b4_prefix[pstate_delete]], [[void]],
- [[b4_prefix[pstate *yyps]], [[yyps]]])[
-#endif
-]])
-b4_percent_code_get([[provides]])[]dnl
-])dnl b4_defines_if
+]b4_shared_declarations[
+]])dnl b4_defines_if
m4_divert_pop(0)
projects / bison.git / blobdiff