int i;
item_number_t *sitems = state->items;
int snritems = state->nitems;
+ symbol_t *previous_lhs = NULL;
/* Output all the items of a state, not only its kernel. */
if (report_flag & report_itemsets)
snritems = nritemset;
}
- if (snritems)
- {
- for (i = 0; i < snritems; i++)
- {
- item_number_t *sp;
- item_number_t *sp1;
- int rule;
+ if (!snritems)
+ return;
- sp1 = sp = ritem + sitems[i];
+ for (i = 0; i < snritems; i++)
+ {
+ item_number_t *sp;
+ item_number_t *sp1;
+ int rule;
- while (*sp >= 0)
- sp++;
+ sp1 = sp = ritem + sitems[i];
- rule = -(*sp);
- fprintf (out, " %s -> ", symbol_tag_get (rules[rule].lhs));
+ while (*sp >= 0)
+ sp++;
- for (sp = rules[rule].rhs; sp < sp1; sp++)
- fprintf (out, "%s ", symbol_tag_get (symbols[*sp]));
+ rule = -(*sp);
- fputc ('.', out);
+ rule_lhs_print (&rules[rule], previous_lhs, out);
+ previous_lhs = rules[rule].lhs;
- for (/* Nothing */; *sp >= 0; ++sp)
- fprintf (out, " %s", symbol_tag_get (symbols[*sp]));
+ for (sp = rules[rule].rhs; sp < sp1; sp++)
+ fprintf (out, " %s", symbol_tag_get (symbols[*sp]));
+ fputs (" .", out);
+ for (/* Nothing */; *sp >= 0; ++sp)
+ fprintf (out, " %s", symbol_tag_get (symbols[*sp]));
- /* Display the lookaheads? */
- if (report_flag & report_lookaheads)
- state_rule_lookaheads_print (state, &rules[rule], out);
-
- fprintf (out, _(" (rule %d)"), rule - 1);
- fputc ('\n', out);
- }
+ /* Display the lookaheads? */
+ if (report_flag & report_lookaheads)
+ state_rule_lookaheads_print (state, &rules[rule], out);
fputc ('\n', out);
}
+
+ fputc ('\n', out);
}
print_shifts (FILE *out, state_t *state)
{
int i;
- shifts *shiftp = state->shifts;
+ shifts_t *shiftp = state->shifts;
for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
if (!SHIFT_IS_DISABLED (shiftp, i))
static void
print_errs (FILE *out, state_t *state)
{
- errs *errp = state->errs;
+ errs_t *errp = state->errs;
int i;
for (i = 0; i < errp->nerrs; ++i)
print_gotos (FILE *out, state_t *state)
{
int i;
- shifts *shiftp = state->shifts;
+ shifts_t *shiftp = state->shifts;
for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
/* Skip token shifts. */;
}
}
-static void
-print_reductions (FILE *out, state_t *state)
+
+/*----------------------------------------------------------.
+| Return the default rule of this STATE if it has one, NULL |
+| otherwise. |
+`----------------------------------------------------------*/
+
+static rule_t *
+state_default_rule_compute (state_t *state)
{
+ reductions_t *redp = state->reductions;
+ rule_t *default_rule = NULL;
+ int cmax = 0;
int i;
- shifts *shiftp = state->shifts;
- reductions *redp = state->reductions;
- errs *errp = state->errs;
- int nodefault = 0;
-
- if (redp->nreds == 0)
- return;
+ /* No need for a lookahead. */
if (state->consistent)
- {
- int rule = redp->rules[0];
- symbol_number_t symbol = rules[rule].lhs->number;
- fprintf (out, _(" $default\treduce using rule %d (%s)\n\n"),
- rule - 1, symbol_tag_get (symbols[symbol]));
- return;
- }
+ return &rules[redp->rules[0]];
+ /* 1. Each reduction is possibly masked by the lookaheads on which
+ we shift (S/R conflicts)... */
bitset_zero (shiftset);
-
- 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;
- bitset_set (shiftset, SHIFT_SYMBOL (shiftp, i));
- }
-
- for (i = 0; i < errp->nerrs; i++)
- if (errp->errs[i])
- bitset_set (shiftset, errp->errs[i]);
-
- if (state->nlookaheads == 1 && !nodefault)
+ {
+ shifts_t *shiftp = state->shifts;
+ 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))
+ return NULL;
+ bitset_set (shiftset, SHIFT_SYMBOL (shiftp, i));
+ }
+ }
+
+ /* 2. Each reduction is possibly masked by the lookaheads on which
+ we raise an error (due to %nonassoc). */
+ {
+ errs_t *errp = state->errs;
+ for (i = 0; i < errp->nerrs; i++)
+ if (errp->errs[i])
+ bitset_set (shiftset, errp->errs[i]);
+ }
+
+ for (i = 0; i < state->nlookaheads; ++i)
{
- rule_t *default_rule = state->lookaheads_rule[0];
+ int count = 0;
- bitset_and (lookaheadset, state->lookaheads[0], shiftset);
+ /* How many non-masked lookaheads are there for this reduction?
+ */
+ bitset_andn (lookaheadset, state->lookaheads[i], shiftset);
+ count = bitset_count (lookaheadset);
- for (i = 0; i < ntokens; i++)
- if (bitset_test (lookaheadset, i))
- fprintf (out, _(" %-4s\t[reduce using rule %d (%s)]\n"),
- symbol_tag_get (symbols[i]),
- default_rule->number - 1,
- symbol_tag_get_n (default_rule->lhs, 1));
+ if (count > cmax)
+ {
+ cmax = count;
+ default_rule = state->lookaheads_rule[i];
+ }
- fprintf (out, _(" $default\treduce using rule %d (%s)\n\n"),
- default_rule->number - 1,
- symbol_tag_get (default_rule->lhs));
+ /* 3. And finally, each reduction is possibly masked by previous
+ reductions (in R/R conflicts, we keep the first reductions).
+ */
+ bitset_or (shiftset, shiftset, state->lookaheads[i]);
}
- else if (state->nlookaheads >= 1)
- {
- int cmax = 0;
- int default_LA = -1;
- rule_t *default_rule = NULL;
- if (!nodefault)
- for (i = 0; i < state->nlookaheads; ++i)
- {
- int count = 0;
- int j;
+ return default_rule;
+}
- bitset_andn (lookaheadset, state->lookaheads[i], shiftset);
- for (j = 0; j < ntokens; j++)
- if (bitset_test (lookaheadset, j))
- count++;
+/*----------------------------------------------------.
+| Report on OUT the reduction actions of this STATE. |
+`----------------------------------------------------*/
- if (count > cmax)
- {
- cmax = count;
- default_LA = i;
- default_rule = state->lookaheads_rule[i];
- }
+static void
+print_reductions (FILE *out, state_t *state)
+{
+ int i;
+ shifts_t *shiftp = state->shifts;
+ reductions_t *redp = state->reductions;
+ rule_t *default_rule = NULL;
- bitset_or (shiftset, shiftset, lookaheadset);
- }
+ if (redp->nreds == 0)
+ return;
- bitset_zero (shiftset);
+ default_rule = state_default_rule_compute (state);
- for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
- if (!SHIFT_IS_DISABLED (shiftp, i))
- bitset_set (shiftset, SHIFT_SYMBOL (shiftp, i));
+ bitset_zero (shiftset);
+ for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
+ if (!SHIFT_IS_DISABLED (shiftp, i))
+ bitset_set (shiftset, SHIFT_SYMBOL (shiftp, i));
- for (i = 0; i < ntokens; i++)
- {
- int j;
- int defaulted = 0;
- int count = bitset_test (shiftset, i);
+ for (i = 0; i < ntokens; i++)
+ {
+ int j;
+ int defaulted = 0;
+ int count = bitset_test (shiftset, i);
- for (j = 0; j < state->nlookaheads; ++j)
- if (bitset_test (state->lookaheads[j], i))
+ for (j = 0; j < state->nlookaheads; ++j)
+ if (bitset_test (state->lookaheads[j], i))
+ {
+ if (count == 0)
{
- if (count == 0)
- {
- if (j != default_LA)
- fprintf (out,
- _(" %-4s\treduce using rule %d (%s)\n"),
- symbol_tag_get (symbols[i]),
- state->lookaheads_rule[j]->number - 1,
- symbol_tag_get_n (state->lookaheads_rule[j]->lhs, 1));
- else
- defaulted = 1;
-
- count++;
- }
+ if (state->lookaheads_rule[j] != default_rule)
+ fprintf (out,
+ _(" %-4s\treduce using rule %d (%s)\n"),
+ symbol_tag_get (symbols[i]),
+ state->lookaheads_rule[j]->number - 1,
+ symbol_tag_get_n (state->lookaheads_rule[j]->lhs, 1));
else
- {
- if (defaulted)
- fprintf (out,
- _(" %-4s\treduce using rule %d (%s)\n"),
- symbol_tag_get (symbols[i]),
- state->lookaheads_rule[default_LA]->number - 1,
- symbol_tag_get_n (state->lookaheads_rule[default_LA]->lhs, 1));
- defaulted = 0;
- fprintf (out,
- _(" %-4s\t[reduce using rule %d (%s)]\n"),
- symbol_tag_get (symbols[i]),
- state->lookaheads_rule[j]->number - 1,
- symbol_tag_get_n (state->lookaheads_rule[j]->lhs, 1));
- }
+ defaulted = 1;
+ count++;
}
- }
-
- if (default_LA >= 0)
- fprintf (out, _(" $default\treduce using rule %d (%s)\n"),
- default_rule->number - 1,
- symbol_tag_get (default_rule->lhs));
+ else
+ {
+ if (defaulted)
+ fprintf (out,
+ _(" %-4s\treduce using rule %d (%s)\n"),
+ symbol_tag_get (symbols[i]),
+ default_rule->number - 1,
+ symbol_tag_get_n (default_rule->lhs, 1));
+ defaulted = 0;
+ fprintf (out,
+ _(" %-4s\t[reduce using rule %d (%s)]\n"),
+ symbol_tag_get (symbols[i]),
+ state->lookaheads_rule[j]->number - 1,
+ symbol_tag_get_n (state->lookaheads_rule[j]->lhs, 1));
+ }
+ }
}
+
+ if (default_rule)
+ fprintf (out, _(" $default\treduce using rule %d (%s)\n"),
+ default_rule->number - 1,
+ symbol_tag_get (default_rule->lhs));
+ fputc ('\n', out);
}
+/*--------------------------------------------------------------.
+| Report on OUT all the actions (shifts, gotos, reductions, and |
+| explicit erros from %nonassoc) of STATE. |
+`--------------------------------------------------------------*/
+
static void
print_actions (FILE *out, state_t *state)
{
- reductions *redp = state->reductions;
- shifts *shiftp = state->shifts;
+ reductions_t *redp = state->reductions;
+ shifts_t *shiftp = state->shifts;
if (shiftp->nshifts == 0 && redp->nreds == 0)
{
if (state->number == final_state->number)
- fprintf (out, _(" $default\taccept\n"));
+ fprintf (out, _(" $default\taccept\n"));
else
- fprintf (out, _(" NO ACTIONS\n"));
+ fprintf (out, _(" NO ACTIONS\n"));
return;
}
print_gotos (out, state);
}
+
static void
print_state (FILE *out, state_t *state)
{
print_grammar (FILE *out)
{
symbol_number_t i;
- item_number_t *rule;
char buffer[90];
int column = 0;
if (token_translations[i] != undeftoken->number)
{
const char *tag = symbol_tag_get (symbols[token_translations[i]]);
- int r;
+ rule_number_t r;
+ item_number_t *rhsp;
+
buffer[0] = 0;
column = strlen (tag);
fputs (tag, out);
sprintf (buffer, " (%d)", i);
for (r = 1; r < nrules + 1; r++)
- for (rule = rules[r].rhs; *rule >= 0; rule++)
- if (item_number_as_symbol_number (*rule) == token_translations[i])
+ for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++)
+ if (item_number_as_symbol_number (*rhsp) == token_translations[i])
{
END_TEST (65);
sprintf (buffer + strlen (buffer), " %d", r - 1);
for (i = ntokens; i < nsyms; i++)
{
int left_count = 0, right_count = 0;
- int r;
+ rule_number_t r;
const char *tag = symbol_tag_get (symbols[i]);
for (r = 1; r < nrules + 1; r++)
{
+ item_number_t *rhsp;
if (rules[r].lhs->number == i)
left_count++;
- for (rule = rules[r].rhs; *rule >= 0; rule++)
- if (item_number_as_symbol_number (*rule) == i)
+ for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++)
+ if (item_number_as_symbol_number (*rhsp) == i)
{
right_count++;
break;
sprintf (buffer + strlen (buffer), _(" on right:"));
for (r = 1; r < nrules + 1; r++)
{
- for (rule = rules[r].rhs; *rule >= 0; rule++)
- if (item_number_as_symbol_number (*rule) == i)
+ item_number_t *rhsp;
+ for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++)
+ if (item_number_as_symbol_number (*rhsp) == i)
{
END_TEST (65);
sprintf (buffer + strlen (buffer), " %d", r - 1);
projects / bison.git / blobdiff