#include "system.h"
+#include "quotearg.h"
#include "files.h"
#include "gram.h"
#include "LR0.h"
#include "reduce.h"
#include "closure.h"
+static unsigned *shiftset = NULL;
+static unsigned *lookaheadset = NULL;
+
#if 0
static void
print_token (int extnum, int token)
}
#endif
+static inline const char *
+escape (const char *s)
+{
+ return quotearg_n_style (1, escape_quoting_style, s);
+}
+
+/* Be cautious not to use twice the same slot in a single expression. */
+static inline const char *
+escape2 (const char *s)
+{
+ return quotearg_n_style (2, escape_quoting_style, s);
+}
+
\f
/*--------------------------------.
| Report information on a state. |
`--------------------------------*/
static void
-print_core (FILE *out, int state)
+print_core (FILE *out, state_t *state)
{
int i;
- short *sitems = state_table[state]->items;
- int snitems = state_table[state]->nitems;
+ short *sitems = state->items;
+ int snitems = state->nitems;
/* New experimental feature: if TRACE_FLAGS output all the items of
a state, not only its kernel. */
sp1 = sp = ritem + sitems[i];
- while (*sp > 0)
+ while (*sp >= 0)
sp++;
rule = -(*sp);
- fprintf (out, " %s -> ", tags[rule_table[rule].lhs]);
+ fprintf (out, " %s -> ", escape (tags[rule_table[rule].lhs]));
for (sp = ritem + rule_table[rule].rhs; sp < sp1; sp++)
- fprintf (out, "%s ", tags[*sp]);
+ fprintf (out, "%s ", escape (tags[*sp]));
fputc ('.', out);
- for (/* Nothing */; *sp > 0; ++sp)
- fprintf (out, " %s", tags[*sp]);
+ for (/* Nothing */; *sp >= 0; ++sp)
+ fprintf (out, " %s", escape (tags[*sp]));
- fprintf (out, _(" (rule %d)"), rule);
+ fprintf (out, _(" (rule %d)"), rule - 1);
fputc ('\n', out);
}
}
}
+
static void
-print_actions (FILE *out, int state)
+print_shifts (FILE *out, state_t *state)
{
int i;
-
- shifts *shiftp = state_table[state]->shifts;
- reductions *redp = state_table[state]->reductions;
- errs *errp = state_table[state]->errs;
-
- if (!shiftp->nshifts && !redp)
- {
- if (final_state == state)
- fprintf (out, _(" $default\taccept\n"));
- else
- fprintf (out, _(" NO ACTIONS\n"));
- return;
- }
+ shifts *shiftp = state->shifts;
for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
if (!SHIFT_IS_DISABLED (shiftp, i))
int symbol = state_table[state1]->accessing_symbol;
fprintf (out,
_(" %-4s\tshift, and go to state %d\n"),
- tags[symbol], state1);
+ escape (tags[symbol]), state1);
}
if (i > 0)
fputc ('\n', out);
+}
+
+
+static void
+print_errs (FILE *out, state_t *state)
+{
+ errs *errp = state->errs;
+ int i;
+
+ for (i = 0; i < errp->nerrs; ++i)
+ if (errp->errs[i])
+ fprintf (out, _(" %-4s\terror (nonassociative)\n"),
+ escape (tags[errp->errs[i]]));
+
+ if (i > 0)
+ fputc ('\n', out);
+}
- if (errp)
+
+static void
+print_gotos (FILE *out, state_t *state)
+{
+ int i;
+ shifts *shiftp = state->shifts;
+
+ for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
+ /* Skip token shifts. */;
+
+ if (i < shiftp->nshifts)
{
- int j;
- for (j = 0; j < errp->nerrs; j++)
- {
- int symbol = errp->errs[j];
- if (!symbol)
- continue;
- fprintf (out, _(" %-4s\terror (nonassociative)\n"),
- tags[symbol]);
- }
+ for (; i < shiftp->nshifts; i++)
+ if (!SHIFT_IS_DISABLED (shiftp, i))
+ {
+ int state1 = shiftp->shifts[i];
+ int symbol = state_table[state1]->accessing_symbol;
+ fprintf (out, _(" %-4s\tgo to state %d\n"),
+ escape (tags[symbol]), state1);
+ }
- if (j > 0)
- fputc ('\n', out);
+ fputc ('\n', out);
}
+}
+
+static void
+print_reductions (FILE *out, state_t *state)
+{
+ int i;
+ shifts *shiftp = state->shifts;
+ reductions *redp = state->reductions;
+ errs *errp = state->errs;
+ int nodefault = 0;
+
+ if (redp->nreds == 0)
+ return;
- if (state_table[state]->consistent && redp)
+ if (state->consistent)
{
int rule = redp->rules[0];
int symbol = rule_table[rule].lhs;
fprintf (out, _(" $default\treduce using rule %d (%s)\n\n"),
- rule, tags[symbol]);
+ rule - 1, escape (tags[symbol]));
+ return;
}
- else if (redp)
+
+ for (i = 0; i < tokensetsize; i++)
+ shiftset[i] = 0;
+
+ for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
+ if (!SHIFT_IS_DISABLED (shiftp, i))
+ {
+ /* if this state has a shift for the error token, don't use a
+ default rule. */
+ if (SHIFT_IS_ERROR (shiftp, i))
+ nodefault = 1;
+ SETBIT (shiftset, SHIFT_SYMBOL (shiftp, i));
+ }
+
+ for (i = 0; i < errp->nerrs; i++)
+ if (errp->errs[i])
+ SETBIT (shiftset, errp->errs[i]);
+
+ if (state->nlookaheads == 1 && !nodefault)
{
- print_reductions (out, state);
- }
+ int k;
+ int default_rule = LAruleno[state->lookaheadsp];
- if (i < shiftp->nshifts)
+ for (k = 0; k < tokensetsize; ++k)
+ lookaheadset[k] = LA (state->lookaheadsp)[k] & shiftset[k];
+
+ for (i = 0; i < ntokens; i++)
+ if (BITISSET (lookaheadset, i))
+ fprintf (out, _(" %-4s\t[reduce using rule %d (%s)]\n"),
+ escape (tags[i]), default_rule - 1,
+ escape2 (tags[rule_table[default_rule].lhs]));
+
+ fprintf (out, _(" $default\treduce using rule %d (%s)\n\n"),
+ default_rule - 1, escape (tags[rule_table[default_rule].lhs]));
+ }
+ else if (state->nlookaheads >= 1)
{
- for (; i < shiftp->nshifts; i++)
- if (!SHIFT_IS_DISABLED (shiftp, i))
+ int cmax = 0;
+ int default_LA = -1;
+ int default_rule = 0;
+
+ if (!nodefault)
+ for (i = 0; i < state->nlookaheads; ++i)
{
- int state1 = shiftp->shifts[i];
- int symbol = state_table[state1]->accessing_symbol;
- fprintf (out, _(" %-4s\tgo to state %d\n"),
- tags[symbol], state1);
+ int count = 0;
+ int j, k;
+
+ for (k = 0; k < tokensetsize; ++k)
+ lookaheadset[k] = LA (state->lookaheadsp + i)[k] & ~shiftset[k];
+
+ for (j = 0; j < ntokens; j++)
+ if (BITISSET (lookaheadset, j))
+ count++;
+
+ if (count > cmax)
+ {
+ cmax = count;
+ default_LA = state->lookaheadsp + i;
+ default_rule = LAruleno[state->lookaheadsp + i];
+ }
+
+ for (k = 0; k < tokensetsize; ++k)
+ shiftset[k] |= lookaheadset[k];
}
- fputc ('\n', out);
+ for (i = 0; i < tokensetsize; i++)
+ shiftset[i] = 0;
+
+ for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
+ if (!SHIFT_IS_DISABLED (shiftp, i))
+ SETBIT (shiftset, SHIFT_SYMBOL (shiftp, i));
+
+ for (i = 0; i < ntokens; i++)
+ {
+ int j;
+ int defaulted = 0;
+ int count = BITISSET (shiftset, i);
+
+ for (j = 0; j < state->nlookaheads; ++j)
+ {
+ if (BITISSET (LA (state->lookaheadsp + j), i))
+ {
+ if (count == 0)
+ {
+ if (state->lookaheadsp + j != default_LA)
+ fprintf (out,
+ _(" %-4s\treduce using rule %d (%s)\n"),
+ escape (tags[i]),
+ LAruleno[state->lookaheadsp + j] - 1,
+ escape2 (tags[rule_table[LAruleno[state->lookaheadsp + j]].lhs]));
+ else
+ defaulted = 1;
+
+ count++;
+ }
+ else
+ {
+ if (defaulted)
+ fprintf (out,
+ _(" %-4s\treduce using rule %d (%s)\n"),
+ escape (tags[i]),
+ LAruleno[default_LA] - 1,
+ escape2 (tags[rule_table[LAruleno[default_LA]].lhs]));
+ defaulted = 0;
+ fprintf (out,
+ _(" %-4s\t[reduce using rule %d (%s)]\n"),
+ escape (tags[i]),
+ LAruleno[state->lookaheadsp + j] - 1,
+ escape2 (tags[rule_table[LAruleno[state->lookaheadsp + j]].lhs]));
+ }
+ }
+ }
+ }
+
+ if (default_LA >= 0)
+ fprintf (out, _(" $default\treduce using rule %d (%s)\n"),
+ default_rule - 1,
+ escape (tags[rule_table[default_rule].lhs]));
}
}
+
+static void
+print_actions (FILE *out, state_t *state)
+{
+ reductions *redp = state->reductions;
+ shifts *shiftp = state->shifts;
+
+ if (shiftp->nshifts == 0 && redp->nreds == 0)
+ {
+ if (final_state == state->number)
+ fprintf (out, _(" $default\taccept\n"));
+ else
+ fprintf (out, _(" NO ACTIONS\n"));
+ return;
+ }
+
+ print_shifts (out, state);
+ print_errs (out, state);
+ print_reductions (out, state);
+ print_gotos (out, state);
+}
+
static void
-print_state (FILE *out, int state)
+print_state (FILE *out, state_t *state)
{
- fprintf (out, _("state %d"), state);
+ fprintf (out, _("state %d"), state->number);
fputs ("\n\n", out);
print_core (out, state);
print_actions (out, state);
if (rule_table[i].useful)
{
fprintf (out, _(" %3d %3d %s ->"),
- i, rule_table[i].line, tags[rule_table[i].lhs]);
+ i - 1, rule_table[i].line, escape (tags[rule_table[i].lhs]));
rule = &ritem[rule_table[i].rhs];
- if (*rule > 0)
- while (*rule > 0)
- fprintf (out, " %s", tags[*rule++]);
+ if (*rule >= 0)
+ while (*rule >= 0)
+ fprintf (out, " %s", escape (tags[*rule++]));
else
fprintf (out, " /* %s */", _("empty"));
fputc ('\n', out);
/* TERMINAL (type #) : rule #s terminal is on RHS */
fprintf (out, "%s\n\n", _("Terminals, with rules where they appear"));
- fprintf (out, "%s (-1)\n", tags[0]);
-
for (i = 0; i <= max_user_token_number; i++)
if (token_translations[i] != 2)
{
buffer[0] = 0;
- column = strlen (tags[token_translations[i]]);
- fputs (tags[token_translations[i]], out);
+ column = strlen (escape (tags[token_translations[i]]));
+ fputs (escape (tags[token_translations[i]]), out);
END_TEST (50);
sprintf (buffer, " (%d)", i);
for (j = 1; j <= nrules; j++)
- for (rule = &ritem[rule_table[j].rhs]; *rule > 0; rule++)
+ for (rule = &ritem[rule_table[j].rhs]; *rule >= 0; rule++)
if (*rule == token_translations[i])
{
END_TEST (65);
- sprintf (buffer + strlen (buffer), " %d", j);
+ sprintf (buffer + strlen (buffer), " %d", j - 1);
break;
}
fprintf (out, "%s\n", buffer);
{
if (rule_table[j].lhs == i)
left_count++;
- for (rule = &ritem[rule_table[j].rhs]; *rule > 0; rule++)
+ for (rule = &ritem[rule_table[j].rhs]; *rule >= 0; rule++)
if (*rule == i)
{
right_count++;
}
buffer[0] = 0;
- fputs (tags[i], out);
- column = strlen (tags[i]);
+ fputs (escape (tags[i]), out);
+ column = strlen (escape (tags[i]));
sprintf (buffer, " (%d)", i);
END_TEST (0);
{
END_TEST (65);
if (rule_table[j].lhs == i)
- sprintf (buffer + strlen (buffer), " %d", j);
+ sprintf (buffer + strlen (buffer), " %d", j - 1);
}
}
sprintf (buffer + strlen (buffer), _(" on right:"));
for (j = 1; j <= nrules; j++)
{
- for (rule = &ritem[rule_table[j].rhs]; *rule > 0; rule++)
+ for (rule = &ritem[rule_table[j].rhs]; *rule >= 0; rule++)
if (*rule == i)
{
END_TEST (65);
- sprintf (buffer + strlen (buffer), " %d", j);
+ sprintf (buffer + strlen (buffer), " %d", j - 1);
break;
}
}
print_grammar (out);
- /* New experimental feature: output all the items of a state,
- not only its kernel. Requires to run closure, which need
- memory allocation/deallocation. */
+ /* New experimental feature: output all the items of a state, not
+ only its kernel. Requires to run closure, which need memory
+ allocation/deallocation. */
if (trace_flag)
- new_closure (nitems);
+ new_closure (nritems);
+ /* Storage for print_reductions. */
+ shiftset = XCALLOC (unsigned, tokensetsize);
+ lookaheadset = XCALLOC (unsigned, tokensetsize);
for (i = 0; i < nstates; i++)
- print_state (out, i);
+ print_state (out, state_table[i]);
+ free (shiftset);
+ free (lookaheadset);
if (trace_flag)
free_closure ();
projects / bison.git / blobdiff