/* Print information on generated parser, for bison,
- Copyright (C) 1984, 1986, 1989, 2000, 2001, 2002
+
+ Copyright (C) 1984, 1986, 1989, 2000, 2001, 2002, 2003
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 <bitset.h>
+#include <quotearg.h>
+
#include "LR0.h"
-#include "lalr.h"
+#include "closure.h"
#include "conflicts.h"
+#include "files.h"
#include "getargs.h"
-#include "state.h"
-#include "reader.h"
+#include "gram.h"
+#include "lalr.h"
#include "print.h"
+#include "reader.h"
#include "reduce.h"
-#include "closure.h"
-#include "bitset.h"
+#include "state.h"
+#include "symtab.h"
static bitset shiftset;
static bitset lookaheadset;
#endif
\f
+
+/*---------------------------------------.
+| *WIDTH := max (*WIDTH, strlen (STR)). |
+`---------------------------------------*/
+
+static void
+max_length (size_t *width, const char *str)
+{
+ size_t len = strlen (str);
+ if (len > *width)
+ *width = len;
+}
+
/*--------------------------------.
| Report information on a state. |
`--------------------------------*/
static void
-print_core (FILE *out, state_t *state)
+print_core (FILE *out, state *s)
{
int i;
- item_number_t *sitems = state->items;
- int snritems = state->nitems;
+ item_number *sitems = s->items;
+ int snritems = s->nitems;
+ symbol *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];
+ fputc ('\n', out);
- while (*sp >= 0)
- sp++;
+ for (i = 0; i < snritems; i++)
+ {
+ item_number *sp;
+ item_number *sp1;
+ rule_number r;
- rule = -(*sp);
- fprintf (out, " %s -> ", symbol_tag_get (rules[rule].lhs));
+ sp1 = sp = ritem + sitems[i];
- for (sp = rules[rule].rhs; sp < sp1; sp++)
- fprintf (out, "%s ", symbol_tag_get (symbols[*sp]));
+ while (*sp >= 0)
+ sp++;
- fputc ('.', out);
+ r = item_number_as_rule_number (*sp);
- for (/* Nothing */; *sp >= 0; ++sp)
- fprintf (out, " %s", symbol_tag_get (symbols[*sp]));
+ rule_lhs_print (&rules[r], previous_lhs, out);
+ previous_lhs = rules[r].lhs;
- /* Display the lookaheads? */
- if (report_flag & report_lookaheads)
- {
- int j, k;
- int nlookaheads = 0;
- /* Look for lookaheads corresponding to this rule. */
- for (j = 0; j < state->nlookaheads; ++j)
- for (k = 0; k < ntokens; ++k)
- if (bitset_test (state->lookaheads[j], k)
- && state->lookaheads_rule[j]->number == rule)
- nlookaheads++;
- if (nlookaheads)
- {
- fprintf (out, " [");
- for (j = 0; j < state->nlookaheads; ++j)
- for (k = 0; k < ntokens; ++k)
- if (bitset_test (state->lookaheads[j], k)
- && state->lookaheads_rule[j]->number == rule)
- fprintf (out, "%s%s",
- symbol_tag_get (symbols[k]),
- --nlookaheads ? ", " : "");
- fprintf (out, "]");
- }
- }
+ for (sp = rules[r].rhs; sp < sp1; sp++)
+ fprintf (out, " %s", symbols[*sp]->tag);
+ fputs (" .", out);
+ for (/* Nothing */; *sp >= 0; ++sp)
+ fprintf (out, " %s", symbols[*sp]->tag);
- fprintf (out, _(" (rule %d)"), rule - 1);
- fputc ('\n', out);
- }
+ /* Display the lookaheads? */
+ if (report_flag & report_lookaheads)
+ state_rule_lookaheads_print (s, &rules[r], out);
fputc ('\n', out);
}
}
+/*------------------------------------------------------------.
+| Report the shifts iff DISPLAY_SHIFTS_P or the gotos of S on |
+| OUT. |
+`------------------------------------------------------------*/
+
static void
-print_shifts (FILE *out, state_t *state)
+print_transitions (state *s, FILE *out, bool display_transitions_p)
{
+ transitions *trans = s->transitions;
+ size_t width = 0;
int i;
- shifts *shiftp = state->shifts;
- for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
- if (!SHIFT_IS_DISABLED (shiftp, i))
+ /* Compute the width of the lookaheads column. */
+ for (i = 0; i < trans->num; i++)
+ if (!TRANSITION_IS_DISABLED (trans, i)
+ && TRANSITION_IS_SHIFT (trans, i) == display_transitions_p)
{
- int state1 = shiftp->shifts[i];
- symbol_number_t symbol = states[state1]->accessing_symbol;
- fprintf (out,
- _(" %-4s\tshift, and go to state %d\n"),
- symbol_tag_get (symbols[symbol]), state1);
+ symbol *sym = symbols[TRANSITION_SYMBOL (trans, i)];
+ max_length (&width, sym->tag);
}
- if (i > 0)
- fputc ('\n', out);
+ /* Nothing to report. */
+ if (!width)
+ return;
+
+ fputc ('\n', out);
+ width += 2;
+
+ /* Report lookaheads and shifts. */
+ for (i = 0; i < trans->num; i++)
+ if (!TRANSITION_IS_DISABLED (trans, i)
+ && TRANSITION_IS_SHIFT (trans, i) == display_transitions_p)
+ {
+ symbol *sym = symbols[TRANSITION_SYMBOL (trans, i)];
+ const char *tag = sym->tag;
+ state *s1 = trans->states[i];
+ int j;
+
+ fprintf (out, " %s", tag);
+ for (j = width - strlen (tag); j > 0; --j)
+ fputc (' ', out);
+ if (display_transitions_p)
+ fprintf (out, _("shift, and go to state %d\n"), s1->number);
+ else
+ fprintf (out, _("go to state %d\n"), s1->number);
+ }
}
+/*--------------------------------------------------------.
+| Report the explicit errors of S raised from %nonassoc. |
+`--------------------------------------------------------*/
+
static void
-print_errs (FILE *out, state_t *state)
+print_errs (FILE *out, state *s)
{
- errs *errp = state->errs;
+ errs *errp = s->errs;
+ size_t width = 0;
int i;
- for (i = 0; i < errp->nerrs; ++i)
- if (errp->errs[i])
- fprintf (out, _(" %-4s\terror (nonassociative)\n"),
- symbol_tag_get (symbols[errp->errs[i]]));
+ /* Compute the width of the lookaheads column. */
+ for (i = 0; i < errp->num; ++i)
+ if (errp->symbols[i])
+ max_length (&width, errp->symbols[i]->tag);
- if (i > 0)
- fputc ('\n', out);
+ /* Nothing to report. */
+ if (!width)
+ return;
+
+ fputc ('\n', out);
+ width += 2;
+
+ /* Report lookaheads and errors. */
+ for (i = 0; i < errp->num; ++i)
+ if (errp->symbols[i])
+ {
+ const char *tag = errp->symbols[i]->tag;
+ int j;
+ fprintf (out, " %s", tag);
+ for (j = width - strlen (tag); j > 0; --j)
+ fputc (' ', out);
+ fputs (_("error (nonassociative)\n"), out);
+ }
}
-static void
-print_gotos (FILE *out, state_t *state)
+/*-------------------------------------------------------------.
+| Return the default rule of S if it has one, NULL otherwise. |
+`-------------------------------------------------------------*/
+
+static rule *
+state_default_rule (state *s)
{
+ reductions *reds = s->reductions;
+ rule *default_rule = NULL;
+ int cmax = 0;
int i;
- shifts *shiftp = state->shifts;
- for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
- /* Skip token shifts. */;
+ /* No need for a lookahead. */
+ if (s->consistent)
+ return reds->rules[0];
- if (i < shiftp->nshifts)
+ /* 1. Each reduction is possibly masked by the lookaheads on which
+ we shift (S/R conflicts)... */
+ bitset_zero (shiftset);
+ {
+ transitions *trans = s->transitions;
+ FOR_EACH_SHIFT (trans, i)
+ {
+ /* If this state has a shift for the error token, don't use a
+ default rule. */
+ if (TRANSITION_IS_ERROR (trans, i))
+ return NULL;
+ bitset_set (shiftset, TRANSITION_SYMBOL (trans, i));
+ }
+ }
+
+ /* 2. Each reduction is possibly masked by the lookaheads on which
+ we raise an error (due to %nonassoc). */
+ {
+ errs *errp = s->errs;
+ for (i = 0; i < errp->num; i++)
+ if (errp->symbols[i])
+ bitset_set (shiftset, errp->symbols[i]->number);
+ }
+
+ for (i = 0; i < reds->num; ++i)
{
- for (; i < shiftp->nshifts; i++)
- if (!SHIFT_IS_DISABLED (shiftp, i))
- {
- int state1 = shiftp->shifts[i];
- symbol_number_t symbol = states[state1]->accessing_symbol;
- fprintf (out, _(" %-4s\tgo to state %d\n"),
- symbol_tag_get (symbols[symbol]), state1);
- }
-
- fputc ('\n', out);
- }
-}
+ int count = 0;
-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;
+ /* How many non-masked lookaheads are there for this reduction?
+ */
+ bitset_andn (lookaheadset, reds->lookaheads[i], shiftset);
+ count = bitset_count (lookaheadset);
- if (redp->nreds == 0)
- return;
+ if (count > cmax)
+ {
+ cmax = count;
+ default_rule = reds->rules[i];
+ }
- 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;
+ /* 3. And finally, each reduction is possibly masked by previous
+ reductions (in R/R conflicts, we keep the first reductions).
+ */
+ bitset_or (shiftset, shiftset, reds->lookaheads[i]);
}
- bitset_zero (shiftset);
+ return default_rule;
+}
- 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]);
+/*--------------------------------------------------------------------.
+| Report a reduction of RULE on LOOKAHEADS (which can be `default'). |
+| If not ENABLED, the rule is masked by a shift or a reduce (S/R and |
+| R/R conflicts). |
+`--------------------------------------------------------------------*/
- if (state->nlookaheads == 1 && !nodefault)
- {
- rule_t *default_rule = state->lookaheads_rule[0];
+static void
+print_reduction (FILE *out, size_t width,
+ const char *lookahead,
+ rule *r, bool enabled)
+{
+ int j;
+ fprintf (out, " %s", lookahead);
+ for (j = width - strlen (lookahead); j > 0; --j)
+ fputc (' ', out);
+ if (!enabled)
+ fputc ('[', out);
+ if (r->number)
+ fprintf (out, _("reduce using rule %d (%s)"), r->number, r->lhs->tag);
+ else
+ fprintf (out, _("accept"));
+ if (!enabled)
+ fputc (']', out);
+ fputc ('\n', out);
+}
- bitset_and (lookaheadset, state->lookaheads[0], shiftset);
- 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));
+/*-------------------------------------------.
+| Report on OUT the reduction actions of S. |
+`-------------------------------------------*/
- fprintf (out, _(" $default\treduce using rule %d (%s)\n\n"),
- default_rule->number - 1,
- symbol_tag_get (default_rule->lhs));
- }
- else if (state->nlookaheads >= 1)
- {
- int cmax = 0;
- int default_LA = -1;
- rule_t *default_rule = NULL;
+static void
+print_reductions (FILE *out, state *s)
+{
+ transitions *trans = s->transitions;
+ reductions *reds = s->reductions;
+ rule *default_rule = NULL;
+ size_t width = 0;
+ int i, j;
- if (!nodefault)
- for (i = 0; i < state->nlookaheads; ++i)
- {
- int count = 0;
- int j;
+ if (reds->num == 0)
+ return;
- bitset_andn (lookaheadset, state->lookaheads[i], shiftset);
+ default_rule = state_default_rule (s);
- for (j = 0; j < ntokens; j++)
- if (bitset_test (lookaheadset, j))
- count++;
+ bitset_zero (shiftset);
+ FOR_EACH_SHIFT (trans, i)
+ bitset_set (shiftset, TRANSITION_SYMBOL (trans, i));
- if (count > cmax)
- {
- cmax = count;
- default_LA = i;
- default_rule = state->lookaheads_rule[i];
- }
+ /* Compute the width of the lookaheads column. */
+ if (default_rule)
+ width = strlen (_("$default"));
- bitset_or (shiftset, shiftset, lookaheadset);
- }
+ if (reds->lookaheads)
+ for (i = 0; i < ntokens; i++)
+ {
+ int count = bitset_test (shiftset, i);
- bitset_zero (shiftset);
+ for (j = 0; j < reds->num; ++j)
+ if (bitset_test (reds->lookaheads[j], i))
+ {
+ if (count == 0)
+ {
+ if (reds->rules[j] != default_rule)
+ max_length (&width, symbols[i]->tag);
+ count++;
+ }
+ else
+ {
+ max_length (&width, symbols[i]->tag);
+ }
+ }
+ }
- 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));
+ /* Nothing to report. */
+ if (!width)
+ return;
- for (i = 0; i < ntokens; i++)
- {
- int j;
- int defaulted = 0;
- int count = bitset_test (shiftset, i);
+ fputc ('\n', out);
+ width += 2;
- for (j = 0; j < state->nlookaheads; ++j)
- if (bitset_test (state->lookaheads[j], i))
- {
- 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++;
- }
- 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));
- }
- }
- }
+ /* Report lookaheads (or $default) and reductions. */
+ if (reds->lookaheads)
+ for (i = 0; i < ntokens; i++)
+ {
+ int defaulted = 0;
+ int count = bitset_test (shiftset, i);
- if (default_LA >= 0)
- fprintf (out, _(" $default\treduce using rule %d (%s)\n"),
- default_rule->number - 1,
- symbol_tag_get (default_rule->lhs));
- }
+ for (j = 0; j < reds->num; ++j)
+ if (bitset_test (reds->lookaheads[j], i))
+ {
+ if (count == 0)
+ {
+ if (reds->rules[j] != default_rule)
+ print_reduction (out, width,
+ symbols[i]->tag,
+ reds->rules[j], true);
+ else
+ defaulted = 1;
+ count++;
+ }
+ else
+ {
+ if (defaulted)
+ print_reduction (out, width,
+ symbols[i]->tag,
+ default_rule, true);
+ defaulted = 0;
+ print_reduction (out, width,
+ symbols[i]->tag,
+ reds->rules[j], false);
+ }
+ }
+ }
+
+ if (default_rule)
+ print_reduction (out, width,
+ _("$default"), default_rule, true);
}
+/*--------------------------------------------------------------.
+| Report on OUT all the actions (shifts, gotos, reductions, and |
+| explicit erros from %nonassoc) of S. |
+`--------------------------------------------------------------*/
+
static void
-print_actions (FILE *out, state_t *state)
+print_actions (FILE *out, state *s)
{
- reductions *redp = state->reductions;
- shifts *shiftp = state->shifts;
+ /* Print shifts. */
+ print_transitions (s, out, true);
+ print_errs (out, s);
+ print_reductions (out, s);
+ /* Print gotos. */
+ print_transitions (s, out, false);
+}
- 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);
-}
+/*----------------------------------.
+| Report all the data on S on OUT. |
+`----------------------------------*/
static void
-print_state (FILE *out, state_t *state)
+print_state (FILE *out, state *s)
{
- fprintf (out, _("state %d"), state->number);
- 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);
+ fprintf (out, _("state %d"), s->number);
+ fputc ('\n', out);
+ print_core (out, s);
+ print_actions (out, s);
+ if ((report_flag & report_solved_conflicts) && s->solved_conflicts)
+ {
+ fputc ('\n', out);
+ fputs (s->solved_conflicts, out);
+ }
}
\f
/*-----------------------------------------.
static void
print_grammar (FILE *out)
{
- symbol_number_t i;
- item_number_t *rule;
+ symbol_number i;
char buffer[90];
int column = 0;
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]]);
- int r;
+ const char *tag = symbols[token_translations[i]]->tag;
+ rule_number r;
+ item_number *rhsp;
+
buffer[0] = 0;
column = strlen (tag);
fputs (tag, out);
END_TEST (50);
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 (r = 0; r < nrules; 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", r - 1);
+ sprintf (buffer + strlen (buffer), " %d", r);
break;
}
fprintf (out, "%s\n", buffer);
for (i = ntokens; i < nsyms; i++)
{
int left_count = 0, right_count = 0;
- int r;
- const char *tag = symbol_tag_get (symbols[i]);
+ rule_number r;
+ const char *tag = symbols[i]->tag;
- for (r = 1; r < nrules + 1; r++)
+ for (r = 0; r < nrules; r++)
{
+ item_number *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;
END_TEST (50);
sprintf (buffer + strlen (buffer), _(" on left:"));
- for (r = 1; r < nrules + 1; r++)
+ for (r = 0; r < nrules; r++)
{
END_TEST (65);
if (rules[r].lhs->number == i)
- sprintf (buffer + strlen (buffer), " %d", r - 1);
+ sprintf (buffer + strlen (buffer), " %d", r);
}
}
sprintf (buffer + strlen (buffer), ",");
END_TEST (50);
sprintf (buffer + strlen (buffer), _(" on right:"));
- for (r = 1; r < nrules + 1; r++)
+ for (r = 0; r < nrules; r++)
{
- for (rule = rules[r].rhs; *rule >= 0; rule++)
- if (item_number_as_symbol_number (*rule) == i)
+ item_number *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);
+ sprintf (buffer + strlen (buffer), " %d", r);
break;
}
}
}
fprintf (out, "%s\n", buffer);
}
- fputs ("\n\n", out);
}
\f
void
print_results (void)
{
- size_t i;
+ state_number 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");
reduce_output (out);
+ grammar_rules_partial_print (out,
+ _("Rules never reduced"), rule_never_reduced_p);
conflicts_output (out);
print_grammar (out);
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