# Yacc compatible skeleton for Bison
-# Copyright (C) 1984, 1989, 1990, 2000, 2001, 2002, 2003, 2004, 2005,
-# 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+# Copyright (C) 1984, 1989-1990, 2000-2011 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])
## ---------------- ##
/* The locations where the error started and ended. */
YYLTYPE yyerror_range[3];]])[
- YYSIZE_T yystacksize;]])
+ YYSIZE_T yystacksize;]b4_lac_if([[
+
+ yytype_int16 yyesa@{]b4_percent_define_get([[parse.lac.es-capacity-initial]])[@};
+ yytype_int16 *yyes;
+ YYSIZE_T yyes_capacity;]])])
## --------------------------------------------------------- ##
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, 2010])[
+b4_copyright([Bison implementation for Yacc-like parsers in C],
+ [1984, 1989-1990, 2000-2011])[
/* C LALR(1) parser skeleton written by Richard Stallman, by
simplifying the original so-called "semantic" parser. */
}
#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
# 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
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 \
((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 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
+#endif /* !YYCOPY_NEEDED */
+
/* YYFINAL -- State number of the termination state. */
#define YYFINAL ]b4_final_state_number[
/* YYLAST -- Last index in YYTABLE. */
{ \
yychar = (Token); \
yylval = (Value); \
- YYPOPSTACK (1); \
+ YYPOPSTACK (1); \]b4_lac_if([[
+ YY_LAC_DISCARD ("YYBACKUP"); \]])[
goto yybackup; \
} \
else \
#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 YYDEBUG
+ 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 YYDEBUG
+# 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 YYDEBUG
+ " (", ")",
#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)
-{
- int yyn = yypact[yystate];
-
- if (! (YYPACT_NINF < yyn && yyn <= YYLAST))
- return 1;
- else
+ ]b4_lac_if([[yytype_int16 *yyesa, yytype_int16 **yyes,
+ YYSIZE_T *yyes_capacity, ]])[yytype_int16 *yyssp, int yytoken)
{
YYSIZE_T yysize0 = yytnamerr (0, yytname[yytoken]);
YYSIZE_T yysize = yysize0;
const char *yyformat = 0;
/* 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)
+ {
+ 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;
- /* Number of reported tokens (one for the "unexpected", one per
- "expected"). */
- int yycount = 0;
- int yyx;
+ int yyxend = yychecklim < YYNTOKENS ? yychecklim : YYNTOKENS;]])[
+ int yyx;]b4_lac_if([[
- yyarg[yycount++] = yytname[yytoken];
+ 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;
}
yyarg[yycount++] = yytname[yyx];
yysize1 = yysize + yytnamerr (0, yytname[yyx]);
- if (! (yysize <= yysize1 && yysize1 <= YYSTACK_ALLOC_MAXIMUM))
- {
- /* Overflow. */
- *yymsg_alloc = 0;
- return 2;
- }
+ if (! (yysize <= yysize1
+ && yysize1 <= YYSTACK_ALLOC_MAXIMUM))
+ return 2;
yysize = yysize1;
}
+ }]b4_lac_if([[
+# if YYDEBUG
+ else if (yydebug)
+ YYFPRINTF (stderr, "No expected tokens.\n");
+# endif]])[
+ }
switch (yycount)
{
-#define YYCASE_(N, S) \
+# 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_
+# undef YYCASE_
}
yysize1 = yysize + yystrlen (yyformat);
if (! (yysize <= yysize1 && yysize1 <= YYSTACK_ALLOC_MAXIMUM))
- {
- /* Overflow. */
- *yymsg_alloc = 0;
- return 2;
- }
+ return 2;
yysize = yysize1;
if (*yymsg_alloc < yysize)
if (! (yysize <= *yymsg_alloc
&& *yymsg_alloc <= YYSTACK_ALLOC_MAXIMUM))
*yymsg_alloc = YYSTACK_ALLOC_MAXIMUM;
- return 2;
+ return 1;
}
/* Avoid sprintf, as that infringes on the user's name space.
}
return 0;
}
-}
#endif /* YYERROR_VERBOSE */
-\f
]b4_yydestruct_generate([b4_c_function_def])b4_push_if([], [[
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. */
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"));
/* 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.
yyerrlab:
/* Make sure we have latest lookahead translation. See comments at
user semantic actions for why this is necessary. */
- yytoken = YYTRANSLATE (yychar);
+ 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
-# define YYSYNTAX_ERROR yysyntax_error (&yymsg_alloc, &yymsg, yystate, \
- yytoken)
+# 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 = YYSYNTAX_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 == 2 && 0 < yymsg_alloc)
+ else if (yysyntax_error_status == 1)
{
if (yymsg != yymsgbuf)
YYSTACK_FREE (yymsg);
{
yymsg = yymsgbuf;
yymsg_alloc = sizeof yymsgbuf;
+ yysyntax_error_status = 2;
}
else
{
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([[
yyresult = 1;
goto yyreturn;
-#if !defined(yyoverflow) || YYERROR_VERBOSE
+#if ]b4_lac_if([[1]], [[!defined(yyoverflow) || YYERROR_VERBOSE]])[
/*-------------------------------------------------.
| yyexhaustedlab -- memory exhaustion comes here. |
`-------------------------------------------------*/
#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_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, 2010])
+b4_copyright([Bison interface for Yacc-like parsers in C],
+ [1984, 1989-1990, 2000-2011])
b4_percent_code_get([[requires]])[]dnl
projects / bison.git / blobdiff