# b4_user_formals
# ---------------
-# This is specific to GLR because it relies on ISO C formal argument
-# declarations.
+# The possible parse-params formal arguments preceded by a comma.
+#
+# This is not shared with yacc.c in c.m4 because GLR relies on ISO C
+# formal argument declarations.
m4_define([b4_user_formals],
[m4_ifset([b4_parse_param], [, b4_c_ansi_formals(b4_parse_param)])])
# b4_yyerror_args
# ---------------
-# Arguments passed to yyerror: user args plus yylloc.
+# Optional effective arguments passed to yyerror: user args plus yylloc, and
+# a trailing comma.
m4_define([b4_yyerror_args],
[b4_pure_if([b4_location_if([yylocp, ])])dnl
m4_ifset([b4_parse_param], [b4_c_args(b4_parse_param), ])])
# b4_pure_args
# ------------
-# Arguments needed by yyerror: user args plus yylloc.
+# Same as b4_yyerror_args, but with a leading comma.
m4_define([b4_pure_args],
[b4_pure_if([b4_location_if([, yylocp])])[]b4_user_args])
-# b4_pure_formals
-# ---------------
-# Arguments passed to yyerror: user formals plus yyllocp.
-m4_define([b4_pure_formals],
-[b4_pure_if([b4_location_if([, YYLTYPE *yylocp])])[]b4_user_formals])
-
-
# b4_lpure_args
# -------------
# Same as above, but on the look-ahead, hence yyllocp instead of yylocp.
[b4_pure_if([b4_location_if([, yyllocp])])[]b4_user_args])
+# b4_pure_formals
+# ---------------
+# Arguments passed to yyerror: user formals plus yyllocp.
+m4_define([b4_pure_formals],
+[b4_pure_if([b4_location_if([, YYLTYPE *yylocp])])[]b4_user_formals])
+
+
# b4_lpure_formals
# ----------------
# Same as above, but on the look-ahead, hence yyllocp instead of yylocp.
# Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH
# symbols on RHS.
m4_define([b4_rhs_value],
-[(((yyGLRStackItem const *)yyvsp)@{YYFILL (m4_eval([$2 - $1]))@}.yystate.yysemantics.yysval[]m4_ifval([$3], [.$3]))])
+[(((yyGLRStackItem const *)yyvsp)@{YYFILL (($2) - ($1))@}.yystate.yysemantics.yysval[]m4_ifval([$3], [.$3]))])
# Expansion of @NUM, where the current rule has RULE-LENGTH symbols
# on RHS.
m4_define([b4_rhs_location],
-[(((yyGLRStackItem const *)yyvsp)@{YYFILL (m4_eval([$2 - $1]))@}.yystate.yyloc)])
+[(((yyGLRStackItem const *)yyvsp)@{YYFILL (($2) - ($1))@}.yystate.yyloc)])
+
+
+
+## -------------- ##
+## Output files. ##
+## -------------- ##
# We do want M4 expansion after # for CPP macros.
m4_changecom()
/* This is the parser code for GLR (Generalized LR) parser. */
]b4_identification
+
m4_if(b4_prefix[], [yy], [],
[/* Substitute the variable and function names. */
#define yyparse b4_prefix[]parse
#define yychar b4_prefix[]char
#define yydebug b4_prefix[]debug
#define yynerrs b4_prefix[]nerrs
-#define yylloc b4_prefix[]lloc])
+#define yylloc b4_prefix[]lloc])
-b4_token_enums(b4_tokens)
+dnl # b4_shared_declarations
+dnl # ----------------------
+dnl # Declaration that might either go into the header (if --defines)
+dnl # or open coded in the parser body.
+m4_define([b4_shared_declarations],
+[b4_token_enums(b4_tokens)[
/* Copy the first part of user declarations. */
-b4_pre_prologue[
-
-/* Enabling traces. */
-#ifndef YYDEBUG
-# define YYDEBUG ]b4_debug[
-#endif
-
-/* Enabling verbose error messages. */
-#ifdef YYERROR_VERBOSE
-# undef YYERROR_VERBOSE
-# define YYERROR_VERBOSE 1
-#else
-# define YYERROR_VERBOSE ]b4_error_verbose[
-#endif
-
-/* Enabling the token table. */
-#ifndef YYTOKEN_TABLE
-# define YYTOKEN_TABLE ]b4_token_table[
-#endif
+]b4_pre_prologue[
#if ! defined (YYSTYPE) && ! defined (YYSTYPE_IS_DECLARED)
]m4_ifdef([b4_stype],
# define YYLTYPE_IS_DECLARED 1
# define YYLTYPE_IS_TRIVIAL 1
#endif
+]])
+
+m4_if(b4_defines_flag, 0,
+ [b4_shared_declarations],
+ [#include @output_header_name@])[
+
+/* Enabling traces. */
+#ifndef YYDEBUG
+# define YYDEBUG ]b4_debug[
+#endif
+
+/* Enabling verbose error messages. */
+#ifdef YYERROR_VERBOSE
+# undef YYERROR_VERBOSE
+# define YYERROR_VERBOSE 1
+#else
+# define YYERROR_VERBOSE ]b4_error_verbose[
+#endif
+
+/* Enabling the token table. */
+#ifndef YYTOKEN_TABLE
+# define YYTOKEN_TABLE ]b4_token_table[
+#endif
/* Default (constant) value used for initialization for null
right-hand sides. Unlike the standard yacc.c template,
#endif
/* Suppress unused-variable warnings by "using" E. */
-#define YYUSE(e) do {;} while (/*CONSTCOND*/ yyfalse && (e))
+#ifndef lint
+# define YYUSE(e) ((void) (e))
+#else
+# define YYUSE(e) /* empty */
+#endif
+
+/* Identity function, used to suppress warnings about constant conditions. */
+#ifndef lint
+# define YYID(n) (n)
+#else
+]b4_c_function_def([YYID], [static int], [[int i], [i]])[
+{
+ return i;
+}
+#endif
#ifndef YYFREE
# define YYFREE free
(Current).first_column = (Current).last_column = \
YYRHSLOC (Rhs, 0).last_column; \
} \
- while (/*CONSTCOND*/ 0)
+ while (YYID (0))
/* YY_LOCATION_PRINT -- Print the location on the stream.
This macro was not mandated originally: define only if we know
# define YY_LOCATION_PRINT(File, Loc) \
fprintf (File, "%d.%d-%d.%d", \
- (Loc).first_line, (Loc).first_column, \
- (Loc).last_line, (Loc).last_column)
+ (Loc).first_line, (Loc).first_column, \
+ (Loc).last_line, (Loc).last_column)
#endif
]],[
#ifndef YYLLOC_DEFAULT
#define YYCHK(YYE) \
do { YYRESULTTAG yyflag = YYE; if (yyflag != yyok) return yyflag; } \
- while (/*CONSTCOND*/ 0)
+ while (YYID (0))
#if YYDEBUG
do { \
if (yydebug) \
YYFPRINTF Args; \
-} while (/*CONSTCOND*/ 0)
+} while (YYID (0))
]b4_yysymprint_generate([b4_c_ansi_function_def])[
{ \
YYFPRINTF (stderr, "%s ", Title); \
yysymprint (stderr, \
- Type, Value]b4_location_if([, Location])[]b4_user_args[); \
+ Type, Value]b4_location_if([, Location])[]b4_user_args[); \
YYFPRINTF (stderr, "\n"); \
} \
-} while (/*CONSTCOND*/ 0)
+} while (YYID (0))
/* Nonzero means print parse trace. It is left uninitialized so that
multiple parsers can coexist. */
# endif
#endif
+#if YYSTACKEXPANDABLE
+# define YY_RESERVE_GLRSTACK(Yystack) \
+ do { \
+ if (Yystack->yyspaceLeft < YYHEADROOM) \
+ yyexpandGLRStack (Yystack); \
+ } while (YYID (0))
+#else
+# define YY_RESERVE_GLRSTACK(Yystack) \
+ do { \
+ if (Yystack->yyspaceLeft < YYHEADROOM) \
+ yyMemoryExhausted (Yystack); \
+ } while (YYID (0))
+#endif
+
+
#if YYERROR_VERBOSE
# ifndef yystpcpy
yyGLRStateSet yytops;
};
+#if YYSTACKEXPANDABLE
static void yyexpandGLRStack (yyGLRStack* yystack);
+#endif
static void yyFail (yyGLRStack* yystack]b4_pure_formals[, const char* yymsg)
__attribute__ ((__noreturn__));
/** Fill in YYVSP[YYLOW1 .. YYLOW0-1] from the chain of states starting
* at YYVSP[YYLOW0].yystate.yypred. Leaves YYVSP[YYLOW1].yystate.yypred
- * containing the pointer to the next state in the chain. Assumes
- * YYLOW1 < YYLOW0. */
+ * containing the pointer to the next state in the chain. */
static void yyfillin (yyGLRStackItem *, int, int) __attribute__ ((__unused__));
static void
yyfillin (yyGLRStackItem *yyvsp, int yylow0, int yylow1)
}
/* Do nothing if YYNORMAL or if *YYLOW <= YYLOW1. Otherwise, fill in
- YYVSP[YYLOW1 .. *YYLOW-1] as in yyfillin and set *YYLOW = YYLOW1.
- For convenience, always return YYLOW1. */
+ * YYVSP[YYLOW1 .. *YYLOW-1] as in yyfillin and set *YYLOW = YYLOW1.
+ * For convenience, always return YYLOW1. */
static inline int yyfill (yyGLRStackItem *, int *, int, yybool)
__attribute__ ((__unused__));
static inline int
* value ($$), and yylocp points to place for location information
* (@@$). Returns yyok for normal return, yyaccept for YYACCEPT,
* yyerr for YYERROR, yyabort for YYABORT. */
-static YYRESULTTAG
+/*ARGSUSED*/ static YYRESULTTAG
yyuserAction (yyRuleNum yyn, int yyrhslen, yyGLRStackItem* yyvsp,
YYSTYPE* yyvalp,
YYLTYPE* YYOPTIONAL_LOC (yylocp),
yyGLRStack* yystack
- ]b4_user_formals[)
+ ]b4_user_formals[)
{
yybool yynormal __attribute__ ((__unused__)) =
(yystack->yysplitPoint == NULL);
int yylow;
-
-# undef yyerrok
+]b4_parse_param_use[]dnl
+[# undef yyerrok
# define yyerrok (yystack->yyerrState = 0)
# undef YYACCEPT
# define YYACCEPT return yyaccept
}
\f
-static void
+/*ARGSUSED*/ static void
yyuserMerge (int yyn, YYSTYPE* yy0, YYSTYPE* yy1)
{
YYUSE (yy0);
#endif
if (yys->yysemantics.yyfirstVal)
- {
- yySemanticOption *yyoption = yys->yysemantics.yyfirstVal;
- yyGLRState *yyrh;
- int yyn;
- for (yyrh = yyoption->yystate, yyn = yyrhsLength (yyoption->yyrule);
- yyn > 0;
- yyrh = yyrh->yypred, yyn -= 1)
- yydestroyGLRState (yymsg, yyrh]b4_user_args[);
- }
+ {
+ yySemanticOption *yyoption = yys->yysemantics.yyfirstVal;
+ yyGLRState *yyrh;
+ int yyn;
+ for (yyrh = yyoption->yystate, yyn = yyrhsLength (yyoption->yyrule);
+ yyn > 0;
+ yyrh = yyrh->yypred, yyn -= 1)
+ yydestroyGLRState (yymsg, yyrh]b4_user_args[);
+ }
}
}
}
#define yyis_pact_ninf(yystate) \
- ]m4_if(m4_eval(b4_pact_ninf < b4_pact_min), 1,
- 0,
- ((yystate) == YYPACT_NINF))[
+ ]m4_if(m4_eval(b4_pact_ninf < b4_pact_min), [1],
+ [0],
+ [((yystate) == YYPACT_NINF)])[
/** True iff LR state STATE has only a default reduction (regardless
* of token). */
}
#define yyis_table_ninf(yytable_value) \
- ]m4_if(m4_eval(b4_table_ninf < b4_table_min), 1,
- 0,
- ((yytable_value) == YYTABLE_NINF))[
+ ]m4_if(m4_eval(b4_table_ninf < b4_table_min), [1],
+ [0],
+ [((yytable_value) == YYTABLE_NINF)])[
/** Set *YYACTION to the action to take in YYSTATE on seeing YYTOKEN.
* Result R means
*/
static inline void
yygetLRActions (yyStateNum yystate, int yytoken,
- int* yyaction, const short int** yyconflicts)
+ int* yyaction, const short int** yyconflicts)
{
int yyindex = yypact[yystate] + yytoken;
if (yyindex < 0 || YYLAST < yyindex || yycheck[yyindex] != yytoken)
/* GLRStates */
+/** Return a fresh GLRStackItem. Callers should call
+ * YY_RESERVE_GLRSTACK afterwards to make sure there is sufficient
+ * headroom. */
+
+static inline yyGLRStackItem*
+yynewGLRStackItem (yyGLRStack* yystack, yybool yyisState)
+{
+ yyGLRStackItem* yynewItem = yystack->yynextFree;
+ yystack->yyspaceLeft -= 1;
+ yystack->yynextFree += 1;
+ yynewItem->yystate.yyisState = yyisState;
+ return yynewItem;
+}
+
static void
yyaddDeferredAction (yyGLRStack* yystack, yyGLRState* yystate,
yyGLRState* rhs, yyRuleNum yyrule)
{
- yySemanticOption* yynewItem;
- yynewItem = &yystack->yynextFree->yyoption;
- yystack->yyspaceLeft -= 1;
- yystack->yynextFree += 1;
- yynewItem->yyisState = yyfalse;
- yynewItem->yystate = rhs;
- yynewItem->yyrule = yyrule;
- yynewItem->yynext = yystate->yysemantics.yyfirstVal;
- yystate->yysemantics.yyfirstVal = yynewItem;
- if (yystack->yyspaceLeft < YYHEADROOM)
- yyexpandGLRStack (yystack);
+ yySemanticOption* yynewOption =
+ &yynewGLRStackItem (yystack, yyfalse)->yyoption;
+ yynewOption->yystate = rhs;
+ yynewOption->yyrule = yyrule;
+ yynewOption->yynext = yystate->yysemantics.yyfirstVal;
+ yystate->yysemantics.yyfirstVal = yynewOption;
+
+ YY_RESERVE_GLRSTACK (yystack);
}
/* GLRStacks */
return yyinitStateSet (&yystack->yytops);
}
-#define YYRELOC(YYFROMITEMS,YYTOITEMS,YYX,YYTYPE) \
+
+#if YYSTACKEXPANDABLE
+# define YYRELOC(YYFROMITEMS,YYTOITEMS,YYX,YYTYPE) \
&((YYTOITEMS) - ((YYFROMITEMS) - (yyGLRStackItem*) (YYX)))->YYTYPE
/** If STACK is expandable, extend it. WARNING: Pointers into the
static void
yyexpandGLRStack (yyGLRStack* yystack)
{
-#if YYSTACKEXPANDABLE
yyGLRStackItem* yynewItems;
yyGLRStackItem* yyp0, *yyp1;
size_t yysize, yynewSize;
yystack->yyitems = yynewItems;
yystack->yynextFree = yynewItems + yysize;
yystack->yyspaceLeft = yynewSize - yysize;
-
-#else
- yyMemoryExhausted (yystack);
-#endif
}
+#endif
static void
yyfreeGLRStack (yyGLRStack* yystack)
size_t yyposn,
YYSTYPE yysval, YYLTYPE* yylocp)
{
- yyGLRStackItem* yynewItem;
+ yyGLRState* yynewState = &yynewGLRStackItem (yystack, yytrue)->yystate;
- yynewItem = yystack->yynextFree;
- yystack->yynextFree += 1;
- yystack->yyspaceLeft -= 1;
- yynewItem->yystate.yyisState = yytrue;
- yynewItem->yystate.yylrState = yylrState;
- yynewItem->yystate.yyposn = yyposn;
- yynewItem->yystate.yyresolved = yytrue;
- yynewItem->yystate.yypred = yystack->yytops.yystates[yyk];
- yystack->yytops.yystates[yyk] = &yynewItem->yystate;
- yynewItem->yystate.yysemantics.yysval = yysval;
- yynewItem->yystate.yyloc = *yylocp;
- if (yystack->yyspaceLeft < YYHEADROOM)
- yyexpandGLRStack (yystack);
+ yynewState->yylrState = yylrState;
+ yynewState->yyposn = yyposn;
+ yynewState->yyresolved = yytrue;
+ yynewState->yypred = yystack->yytops.yystates[yyk];
+ yynewState->yysemantics.yysval = yysval;
+ yynewState->yyloc = *yylocp;
+ yystack->yytops.yystates[yyk] = yynewState;
+
+ YY_RESERVE_GLRSTACK (yystack);
}
/** Shift stack #K of YYSTACK, to a new state corresponding to LR
yyglrShiftDefer (yyGLRStack* yystack, size_t yyk, yyStateNum yylrState,
size_t yyposn, yyGLRState* rhs, yyRuleNum yyrule)
{
- yyGLRStackItem* yynewItem;
+ yyGLRState* yynewState = &yynewGLRStackItem (yystack, yytrue)->yystate;
- yynewItem = yystack->yynextFree;
- yynewItem->yystate.yyisState = yytrue;
- yynewItem->yystate.yylrState = yylrState;
- yynewItem->yystate.yyposn = yyposn;
- yynewItem->yystate.yyresolved = yyfalse;
- yynewItem->yystate.yypred = yystack->yytops.yystates[yyk];
- yynewItem->yystate.yysemantics.yyfirstVal = NULL;
- yystack->yytops.yystates[yyk] = &yynewItem->yystate;
- yystack->yynextFree += 1;
- yystack->yyspaceLeft -= 1;
- yyaddDeferredAction (yystack, &yynewItem->yystate, rhs, yyrule);
+ yynewState->yylrState = yylrState;
+ yynewState->yyposn = yyposn;
+ yynewState->yyresolved = yyfalse;
+ yynewState->yypred = yystack->yytops.yystates[yyk];
+ yynewState->yysemantics.yyfirstVal = NULL;
+ yystack->yytops.yystates[yyk] = yynewState;
+
+ /* Invokes YY_RESERVE_GLRSTACK. */
+ yyaddDeferredAction (yystack, yynewState, rhs, yyrule);
}
/** Pop the symbols consumed by reduction #RULE from the top of stack
}
else
{
+ /* At present, doAction is never called in nondeterministic
+ * mode, so this branch is never taken. It is here in
+ * anticipation of a future feature that will allow immediate
+ * evaluation of selected actions in nondeterministic mode. */
int yyi;
yyGLRState* yys;
yyGLRStackItem yyrhsVals[YYMAXRHS + YYMAXLEFT + 1];
yys = yyrhsVals[YYMAXRHS + YYMAXLEFT].yystate.yypred
- = yystack->yytops.yystates[yyk];
+ = yystack->yytops.yystates[yyk];]b4_location_if([[
+ if (yynrhs == 0)
+ /* Set default location. */
+ yyrhsVals[YYMAXRHS + YYMAXLEFT - 1].yystate.yyloc = yys->yyloc;]])[
for (yyi = 0; yyi < yynrhs; yyi += 1)
{
yys = yys->yypred;
}
#if !YYDEBUG
-# define YY_REDUCE_PRINT(K, Rule)
+# define YY_REDUCE_PRINT(Args)
#else
-# define YY_REDUCE_PRINT(K, Rule) \
+# define YY_REDUCE_PRINT(Args) \
do { \
if (yydebug) \
- yy_reduce_print (K, Rule); \
-} while (/*CONSTCOND*/ 0)
+ yy_reduce_print Args; \
+} while (YYID (0))
/*----------------------------------------------------------.
| Report that the RULE is going to be reduced on stack #K. |
`----------------------------------------------------------*/
-static inline void
-yy_reduce_print (size_t yyk, yyRuleNum yyrule)
+/*ARGSUSED*/ static inline void
+yy_reduce_print (yyGLRStack* yystack, size_t yyk, yyRuleNum yyrule,
+ YYSTYPE* yyvalp, YYLTYPE* yylocp]b4_user_formals[)
{
+ int yynrhs = yyrhsLength (yyrule);
+ yybool yynormal __attribute__ ((__unused__)) =
+ (yystack->yysplitPoint == NULL);
+ yyGLRStackItem* yyvsp = (yyGLRStackItem*) yystack->yytops.yystates[yyk];
+ int yylow = 1;
int yyi;
- YYFPRINTF (stderr, "Reducing stack %lu by rule %d (line %lu), ",
+ YYUSE (yyvalp);
+ YYUSE (yylocp);
+]b4_parse_param_use[]dnl
+[ YYFPRINTF (stderr, "Reducing stack %lu by rule %d (line %lu):\n",
(unsigned long int) yyk, yyrule - 1,
(unsigned long int) yyrline[yyrule]);
- /* Print the symbols being reduced, and their result. */
- for (yyi = yyprhs[yyrule]; 0 <= yyrhs[yyi]; yyi++)
- YYFPRINTF (stderr, "%s ", yytokenName (yyrhs[yyi]));
- YYFPRINTF (stderr, "-> %s\n", yytokenName (yyr1[yyrule]));
+ /* The symbols being reduced. */
+ for (yyi = 0; yyi < yynrhs; yyi++)
+ {
+ fprintf (stderr, " $%d = ", yyi + 1);
+ yysymprint (stderr, yyrhs[yyprhs[yyrule] + yyi],
+ &]b4_rhs_value(yynrhs, yyi + 1)[
+ ]b4_location_if([, &]b4_rhs_location(yynrhs, yyi + 1))[]dnl
+ b4_user_args[);
+ fprintf (stderr, "\n");
+ }
}
#endif
*/
static inline YYRESULTTAG
yyglrReduce (yyGLRStack* yystack, size_t yyk, yyRuleNum yyrule,
- yybool yyforceEval]b4_user_formals[)
+ yybool yyforceEval]b4_user_formals[)
{
size_t yyposn = yystack->yytops.yystates[yyk]->yyposn;
YYSTYPE yysval;
YYLTYPE yyloc;
- YY_REDUCE_PRINT (yyk, yyrule);
+ YY_REDUCE_PRINT ((yystack, yyk, yyrule, &yysval, &yyloc]b4_user_args[));
YYCHK (yydoAction (yystack, yyk, yyrule, &yysval, &yyloc]b4_user_args[));
+ YY_SYMBOL_PRINT ("-> $$ =", yyr1[yyrule], &yysval, &yyloc);
yyglrShift (yystack, yyk,
yyLRgotoState (yystack->yytops.yystates[yyk]->yylrState,
yylhsNonterm (yyrule)),
static YYRESULTTAG
yyresolveAction (yySemanticOption* yyopt, yyGLRStack* yystack,
- YYSTYPE* yyvalp, YYLTYPE* yylocp]b4_user_formals[)
+ YYSTYPE* yyvalp, YYLTYPE* yylocp]b4_user_formals[)
{
yyGLRStackItem yyrhsVals[YYMAXRHS + YYMAXLEFT + 1];
int yynrhs;
yynrhs = yyrhsLength (yyopt->yyrule);
YYCHK (yyresolveStates (yyopt->yystate, yynrhs, yystack]b4_user_args[));
- yyrhsVals[YYMAXRHS + YYMAXLEFT].yystate.yypred = yyopt->yystate;
+ yyrhsVals[YYMAXRHS + YYMAXLEFT].yystate.yypred = yyopt->yystate;]b4_location_if([[
+ if (yynrhs == 0)
+ /* Set default location. */
+ yyrhsVals[YYMAXRHS + YYMAXLEFT - 1].yystate.yyloc = yyopt->yystate->yyloc;]])[
return yyuserAction (yyopt->yyrule, yynrhs,
yyrhsVals + YYMAXRHS + YYMAXLEFT - 1,
yyvalp, yylocp, yystack]b4_user_args[);
break;
default:
/* This cannot happen so it is not worth a YYASSERT (yyfalse),
- but some compilers complain if the default case is
+ but some compilers complain if the default case is
omitted. */
break;
}
static YYRESULTTAG
yyprocessOneStack (yyGLRStack* yystack, size_t yyk,
- size_t yyposn, YYSTYPE* yylvalp, YYLTYPE* yyllocp
+ size_t yyposn, YYSTYPE* yylvalp, YYLTYPE* yyllocp
]b4_pure_formals[)
{
int yyaction;
}
if (yyisShiftAction (yyaction))
- {
- YYDPRINTF ((stderr, "On stack %lu, ", (unsigned long int) yyk));
- YY_SYMBOL_PRINT ("shifting", *yytokenp, yylvalp, yyllocp);
- yyglrShift (yystack, yyk, yyaction, yyposn+1,
- *yylvalp, yyllocp);
- YYDPRINTF ((stderr, "Stack %lu now in state #%d\n",
- (unsigned long int) yyk,
- yystack->yytops.yystates[yyk]->yylrState));
- break;
- }
+ break;
else if (yyisErrorAction (yyaction))
{
YYDPRINTF ((stderr, "Stack %lu dies.\n",
/* Recover from a syntax error on YYSTACK, assuming that YYTOKENP,
YYLVALP, and YYLLOCP point to the syntactic category, semantic
value, and location of the look-ahead. */
-static void
+/*ARGSUSED*/ static void
yyrecoverSyntaxError (yyGLRStack* yystack,
YYSTYPE* yylvalp,
YYLTYPE* YYOPTIONAL_LOC (yyllocp)
default: \
goto yybuglab; \
} \
- } while (/*CONSTCOND*/ 0)
+ } while (YYID (0))
/*----------.
const short int* yyconflicts;
yyStateNum yystate = yystack.yytops.yystates[0]->yylrState;
- YYDPRINTF ((stderr, "Entering state %d\n", yystate));
+ YYDPRINTF ((stderr, "Entering state %d\n", yystate));
if (yystate == YYFINAL)
goto yyacceptlab;
if (yyisDefaultedState (yystate))
YYDPRINTF ((stderr, "Reading a token: "));
yychar = YYLEX;
yytoken = YYTRANSLATE (yychar);
- YY_SYMBOL_PRINT ("Next token is", yytoken, yylvalp, yyllocp);
+ YY_SYMBOL_PRINT ("Next token is", yytoken, yylvalp, yyllocp);
}
yygetLRActions (yystate, yytoken, &yyaction, &yyconflicts);
if (*yyconflicts != 0)
while (yytrue)
{
+ yySymbol yytoken_to_shift;
size_t yys;
size_t yyn = yystack.yytops.yysize;
+
+ /* yyprocessOneStack returns one of three things:
+
+ - An error flag. If the caller is yyprocessOneStack, it
+ immediately returns as well. When the caller is finally
+ yyparse, it jumps to an error label via YYCHK1.
+
+ - yyok, but yyprocessOneStack has invoked yymarkStackDeleted
+ (&yystack, yys), which sets the top state of yys to NULL. Thus,
+ yyparse's following invocation of yyremoveDeletes will remove
+ the stack.
+
+ - yyok, when ready to shift a token.
+
+ Except in the first case, yyparse will invoke yyremoveDeletes and
+ then shift the next token onto all remaining stacks. This
+ synchronization of the shift (that is, after all preceding
+ reductions on all stacks) helps prevents double destructor calls
+ on yylval in the event of memory exhaustion. */
+
for (yys = 0; yys < yyn; yys += 1)
YYCHK1 (yyprocessOneStack (&yystack, yys, yyposn,
yylvalp, yyllocp]b4_lpure_args[));
+ yyremoveDeletes (&yystack);
+ yyn = yystack.yytops.yysize;
+
+ /* If any yyglrShift call fails, it will fail after shifting. Thus,
+ a copy of yylval will already be on stack 0 in the event of a
+ failure in the following loop. Thus, yytoken is set to YYEMPTY
+ before the loop to make sure the user destructor for yylval isn't
+ called twice. */
+ yytoken_to_shift = yytoken;
yytoken = YYEMPTY;
yyposn += 1;
- yyremoveDeletes (&yystack);
+ for (yys = 0; yys < yyn; yys += 1)
+ {
+ int yyaction;
+ const short int* yyconflicts;
+ yyStateNum yystate = yystack.yytops.yystates[yys]->yylrState;
+ yygetLRActions (yystate, yytoken_to_shift, &yyaction,
+ &yyconflicts);
+ /* Note that yyconflicts were handled by yyprocessOneStack. */
+ YYDPRINTF ((stderr, "On stack %lu, ", (unsigned long int) yys));
+ YY_SYMBOL_PRINT ("shifting", yytoken_to_shift, yylvalp, yyllocp);
+ yyglrShift (&yystack, yys, yyaction, yyposn,
+ *yylvalp, yyllocp);
+ YYDPRINTF ((stderr, "Stack %lu now in state #%d\n",
+ (unsigned long int) yys,
+ yystack.yytops.yystates[yys]->yylrState));
+ }
if (yystack.yytops.yysize == 0)
{
yyundeleteLastStack (&yystack);
yyreturn:
if (yytoken != YYEOF && yytoken != YYEMPTY)
yydestruct ("Cleanup: discarding lookahead",
- yytoken, yylvalp]b4_location_if([, yyllocp])[]b4_user_args[);
+ yytoken, yylvalp]b4_location_if([, yyllocp])[]b4_user_args[);
/* If the stack is well-formed, pop the stack until it is empty,
destroying its entries as we go. But free the stack regardless
{
yyGLRState** yystates = yystack.yytops.yystates;
if (yystates)
- while (yystates[0])
- {
- yyGLRState *yys = yystates[0];
-]b4_location_if([[ yystack.yyerror_range[1].yystate.yyloc = yys->yyloc;]]
-)[ yydestroyGLRState ("Cleanup: popping", yys]b4_user_args[);
- yystates[0] = yys->yypred;
- yystack.yynextFree -= 1;
- yystack.yyspaceLeft += 1;
- }
+ {
+ size_t yysize = yystack.yytops.yysize;
+ size_t yyk;
+ for (yyk = 0; yyk < yysize; yyk += 1)
+ if (yystates[yyk])
+ {
+ while (yystates[yyk])
+ {
+ yyGLRState *yys = yystates[yyk];
+]b4_location_if([[ yystack.yyerror_range[1].yystate.yyloc = yys->yyloc;]]
+)[ yydestroyGLRState ("Cleanup: popping", yys]b4_user_args[);
+ yystates[yyk] = yys->yypred;
+ yystack.yynextFree -= 1;
+ yystack.yyspaceLeft += 1;
+ }
+ break;
+ }
+ }
yyfreeGLRStack (&yystack);
}
m4_if(b4_defines_flag, 0, [],
[@output @output_header_name@
b4_copyright([Skeleton parser for GLR parsing with Bison],
- [2002, 2003, 2004, 2005])
+ [2002, 2003, 2004, 2005])[
-b4_token_enums(b4_tokens)
+/* As a special exception, when this parser skeleton is copied by
+ Bison into a Bison output file, you may use that output file
+ without restriction. This special exception was added by the Free
+ Software Foundation for C GLR parsers in version 2.2 of Bison. */
-#if ! defined (YYSTYPE) && ! defined (YYSTYPE_IS_DECLARED)
-m4_ifdef([b4_stype],
-[b4_syncline([b4_stype_line], [b4_file_name])
-typedef union m4_bregexp(b4_stype, [^{], [YYSTYPE ])b4_stype YYSTYPE;
-/* Line __line__ of glr.c. */
-b4_syncline([@oline@], [@ofile@])],
-[typedef int YYSTYPE;])
-# define YYSTYPE_IS_DECLARED 1
-# define YYSTYPE_IS_TRIVIAL 1
-#endif
+/* C GLR parser skeleton written by Paul Hilfinger. */
+]
-b4_pure_if([],
-[extern YYSTYPE b4_prefix[]lval;])
+b4_shared_declarations
-#if ! defined (YYLTYPE) && ! defined (YYLTYPE_IS_DECLARED)
-typedef struct YYLTYPE
-{
-b4_location_if([
- int first_line;
- int first_column;
- int last_line;
- int last_column;
-],[
- char yydummy;
-])
-} YYLTYPE;
-# define YYLTYPE_IS_DECLARED 1
-# define YYLTYPE_IS_TRIVIAL 1
-#endif
+extern YYSTYPE b4_prefix[]lval;
b4_location_if([b4_pure_if([],
[extern YYLTYPE b4_prefix[]lloc;])
projects / bison.git / blobdiff