/* Print information on generated parser, for bison,
- Copyright 1984, 1986, 1989, 2000, 2001 Free Software Foundation, Inc.
+ Copyright (C) 1984, 1986, 1989, 2000, 2001, 2002
+ Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
#include "system.h"
+#include "quotearg.h"
#include "files.h"
+#include "symtab.h"
#include "gram.h"
#include "LR0.h"
#include "lalr.h"
#include "print.h"
#include "reduce.h"
#include "closure.h"
+#include "bitset.h"
+
+static bitset shiftset;
+static bitset lookaheadset;
#if 0
static void
print_core (FILE *out, state_t *state)
{
int i;
- short *sitems = state->items;
- int snitems = state->nitems;
+ item_number_t *sitems = state->items;
+ int snritems = state->nitems;
+ symbol_t *previous_lhs = NULL;
- /* New experimental feature: if TRACE_FLAGS output all the items of
- a state, not only its kernel. */
- if (trace_flag)
+ /* Output all the items of a state, not only its kernel. */
+ if (report_flag & report_itemsets)
{
- closure (sitems, snitems);
+ closure (sitems, snritems);
sitems = itemset;
- snitems = nitemset;
+ snritems = nritemset;
}
- if (snitems)
+ if (!snritems)
+ return;
+
+ for (i = 0; i < snritems; i++)
{
- for (i = 0; i < snitems; i++)
- {
- short *sp;
- short *sp1;
- int rule;
+ item_number_t *sp;
+ item_number_t *sp1;
+ int rule;
- sp1 = sp = ritem + sitems[i];
+ sp1 = sp = ritem + sitems[i];
- while (*sp > 0)
- sp++;
+ while (*sp >= 0)
+ sp++;
- rule = -(*sp);
- fprintf (out, " %s -> ", tags[rule_table[rule].lhs]);
+ rule = -(*sp);
- for (sp = ritem + rule_table[rule].rhs; sp < sp1; sp++)
- fprintf (out, "%s ", tags[*sp]);
+ rule_lhs_print (&rules[rule], previous_lhs, out);
+ previous_lhs = rules[rule].lhs;
- fputc ('.', out);
+ 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]));
- for (/* Nothing */; *sp > 0; ++sp)
- fprintf (out, " %s", tags[*sp]);
-
- fprintf (out, _(" (rule %d)"), rule);
- 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);
}
+
static void
-print_actions (FILE *out, state_t *state)
+print_shifts (FILE *out, state_t *state)
{
int i;
-
- shifts *shiftp = state->shifts;
- reductions *redp = state->reductions;
- errs *errp = state->errs;
-
- if (!shiftp->nshifts && !redp)
- {
- if (final_state == state->number)
- fprintf (out, _(" $default\taccept\n"));
- else
- fprintf (out, _(" NO ACTIONS\n"));
- return;
- }
+ shifts_t *shiftp = state->shifts;
for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
if (!SHIFT_IS_DISABLED (shiftp, i))
{
- int state1 = shiftp->shifts[i];
- int symbol = state_table[state1]->accessing_symbol;
+ state_number_t state1 = shiftp->shifts[i];
+ symbol_number_t symbol = states[state1]->accessing_symbol;
fprintf (out,
_(" %-4s\tshift, and go to state %d\n"),
- tags[symbol], state1);
+ symbol_tag_get (symbols[symbol]), state1);
}
if (i > 0)
fputc ('\n', out);
+}
- if (errp)
- {
- 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]);
- }
- if (j > 0)
- fputc ('\n', out);
- }
+static void
+print_errs (FILE *out, state_t *state)
+{
+ errs_t *errp = state->errs;
+ int i;
- if (state->consistent && redp)
- {
- int rule = redp->rules[0];
- int symbol = rule_table[rule].lhs;
- fprintf (out, _(" $default\treduce using rule %d (%s)\n\n"),
- rule, tags[symbol]);
- }
- else if (redp)
- {
- print_reductions (out, state);
- }
+ for (i = 0; i < errp->nerrs; ++i)
+ if (errp->errs[i])
+ fprintf (out, _(" %-4s\terror (nonassociative)\n"),
+ symbol_tag_get (symbols[errp->errs[i]]));
+
+ if (i > 0)
+ fputc ('\n', out);
+}
+
+
+static void
+print_gotos (FILE *out, state_t *state)
+{
+ int i;
+ shifts_t *shiftp = state->shifts;
+
+ for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
+ /* Skip token shifts. */;
if (i < shiftp->nshifts)
{
for (; i < shiftp->nshifts; i++)
if (!SHIFT_IS_DISABLED (shiftp, i))
{
- int state1 = shiftp->shifts[i];
- int symbol = state_table[state1]->accessing_symbol;
+ state_number_t state1 = shiftp->shifts[i];
+ symbol_number_t symbol = states[state1]->accessing_symbol;
fprintf (out, _(" %-4s\tgo to state %d\n"),
- tags[symbol], state1);
+ symbol_tag_get (symbols[symbol]), state1);
}
fputc ('\n', out);
}
}
+
+/*----------------------------------------------------------.
+| 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;
+
+ /* No need for a lookahead. */
+ if (state->consistent)
+ return &rules[redp->rules[0]];
+
+ /* 1. Each reduction is possibly masked by the lookaheads on which
+ we shift (S/R conflicts)... */
+ bitset_zero (shiftset);
+ {
+ 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)
+ {
+ int count = 0;
+
+ /* How many non-masked lookaheads are there for this reduction?
+ */
+ bitset_andn (lookaheadset, state->lookaheads[i], shiftset);
+ count = bitset_count (lookaheadset);
+
+ if (count > cmax)
+ {
+ cmax = count;
+ default_rule = state->lookaheads_rule[i];
+ }
+
+ /* 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]);
+ }
+
+ return default_rule;
+}
+
+
+/*----------------------------------------------------.
+| Report on OUT the reduction actions of this STATE. |
+`----------------------------------------------------*/
+
+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;
+
+ if (redp->nreds == 0)
+ return;
+
+ default_rule = state_default_rule_compute (state);
+
+ 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 (j = 0; j < state->nlookaheads; ++j)
+ if (bitset_test (state->lookaheads[j], i))
+ {
+ if (count == 0)
+ {
+ 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
+ defaulted = 1;
+ count++;
+ }
+ 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_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"));
+ 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, state_t *state)
{
fputs ("\n\n", out);
print_core (out, state);
print_actions (out, state);
+ if ((report_flag & report_solved_conflicts)
+ && state->solved_conflicts)
+ fputs (state->solved_conflicts, out);
fputs ("\n\n", out);
}
\f
static void
print_grammar (FILE *out)
{
- int i, j;
- short *rule;
+ symbol_number_t i;
char buffer[90];
int column = 0;
- /* rule # : LHS -> RHS */
- fprintf (out, "%s\n\n", _("Grammar"));
- fprintf (out, " %s\n", _("Number, Line, Rule"));
- for (i = 1; i <= nrules; i++)
- /* Don't print rules disabled in reduce_grammar_tables. */
- if (rule_table[i].useful)
- {
- fprintf (out, _(" %3d %3d %s ->"),
- i, rule_table[i].line, tags[rule_table[i].lhs]);
- rule = &ritem[rule_table[i].rhs];
- if (*rule > 0)
- while (*rule > 0)
- fprintf (out, " %s", tags[*rule++]);
- else
- fprintf (out, " /* %s */", _("empty"));
- fputc ('\n', out);
- }
- fputs ("\n\n", out);
-
+ grammar_rules_print (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)
+ for (i = 0; i < max_user_token_number + 1; i++)
+ if (token_translations[i] != undeftoken->number)
{
+ const char *tag = symbol_tag_get (symbols[token_translations[i]]);
+ rule_number_t r;
+ item_number_t *rhsp;
+
buffer[0] = 0;
- column = strlen (tags[token_translations[i]]);
- fputs (tags[token_translations[i]], out);
+ column = strlen (tag);
+ fputs (tag, out);
END_TEST (50);
sprintf (buffer, " (%d)", i);
- for (j = 1; j <= nrules; j++)
- for (rule = &ritem[rule_table[j].rhs]; *rule > 0; rule++)
- if (*rule == token_translations[i])
+ for (r = 1; r < nrules + 1; r++)
+ 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", j);
+ sprintf (buffer + strlen (buffer), " %d", r - 1);
break;
}
fprintf (out, "%s\n", buffer);
fprintf (out, "%s\n\n", _("Nonterminals, with rules where they appear"));
- for (i = ntokens; i <= nsyms - 1; i++)
+ for (i = ntokens; i < nsyms; i++)
{
int left_count = 0, right_count = 0;
+ rule_number_t r;
+ const char *tag = symbol_tag_get (symbols[i]);
- for (j = 1; j <= nrules; j++)
+ for (r = 1; r < nrules + 1; r++)
{
- if (rule_table[j].lhs == i)
+ item_number_t *rhsp;
+ if (rules[r].lhs->number == i)
left_count++;
- for (rule = &ritem[rule_table[j].rhs]; *rule > 0; rule++)
- if (*rule == i)
+ for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++)
+ if (item_number_as_symbol_number (*rhsp) == i)
{
right_count++;
break;
}
buffer[0] = 0;
- fputs (tags[i], out);
- column = strlen (tags[i]);
+ fputs (tag, out);
+ column = strlen (tag);
sprintf (buffer, " (%d)", i);
END_TEST (0);
END_TEST (50);
sprintf (buffer + strlen (buffer), _(" on left:"));
- for (j = 1; j <= nrules; j++)
+ for (r = 1; r < nrules + 1; r++)
{
END_TEST (65);
- if (rule_table[j].lhs == i)
- sprintf (buffer + strlen (buffer), " %d", j);
+ if (rules[r].lhs->number == i)
+ sprintf (buffer + strlen (buffer), " %d", r - 1);
}
}
sprintf (buffer + strlen (buffer), ",");
END_TEST (50);
sprintf (buffer + strlen (buffer), _(" on right:"));
- for (j = 1; j <= nrules; j++)
+ for (r = 1; r < nrules + 1; r++)
{
- for (rule = &ritem[rule_table[j].rhs]; *rule > 0; rule++)
- if (*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", j);
+ sprintf (buffer + strlen (buffer), " %d", r - 1);
break;
}
}
void
print_results (void)
{
- int i;
+ state_number_t i;
/* We used to use just .out if SPEC_NAME_PREFIX (-p) was used, but
that conflicts with Posix. */
FILE *out = xfopen (spec_verbose_file, "w");
- size_t size = obstack_object_size (&output_obstack);
- fwrite (obstack_finish (&output_obstack), 1, size, out);
- obstack_free (&output_obstack, NULL);
-
- if (size)
- fputs ("\n\n", out);
-
reduce_output (out);
conflicts_output (out);
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. */
- if (trace_flag)
- new_closure (nitems);
+ /* If the whole state item sets, not only the kernels, are wanted,
+ `closure' will be run, which needs memory allocation/deallocation. */
+ if (report_flag & report_itemsets)
+ new_closure (nritems);
+ /* Storage for print_reductions. */
+ shiftset = bitset_create (ntokens, BITSET_FIXED);
+ lookaheadset = bitset_create (ntokens, BITSET_FIXED);
for (i = 0; i < nstates; i++)
- print_state (out, state_table[i]);
- if (trace_flag)
+ print_state (out, states[i]);
+ bitset_free (shiftset);
+ bitset_free (lookaheadset);
+ if (report_flag & report_itemsets)
free_closure ();
xfclose (out);
projects / bison.git / blobdiff