/* Print information on generated parser, for bison,
- Copyright (C) 1984, 1986, 1989, 2000, 2001, 2002
- Free Software Foundation, Inc.
+
+ Copyright (C) 1984, 1986, 1989, 2000-2005, 2007, 2009-2013 Free
+ Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
- Bison is free software; you can redistribute it and/or modify
+ This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
- Bison is distributed in the hope that it will be useful,
+ This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with Bison; see the file COPYING. If not, write to
- the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
-
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+#include <config.h>
#include "system.h"
-#include "quotearg.h"
-#include "files.h"
-#include "symtab.h"
-#include "gram.h"
+
+#include <bitset.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 "muscle-tab.h"
#include "print.h"
+#include "reader.h"
#include "reduce.h"
-#include "closure.h"
-#include "bitset.h"
+#include "state.h"
+#include "symtab.h"
+#include "tables.h"
-static bitset shiftset;
-static bitset lookaheadset;
+static bitset no_reduce_set;
#if 0
static void
`--------------------------------*/
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;
- symbol_t *previous_lhs = NULL;
+ size_t i;
+ item_number *sitems = s->items;
+ size_t snritems = s->nitems;
+ symbol *previous_lhs = NULL;
/* Output all the items of a state, not only its kernel. */
if (report_flag & report_itemsets)
{
closure (sitems, snritems);
sitems = itemset;
- snritems = nritemset;
+ snritems = nitemset;
}
if (!snritems)
for (i = 0; i < snritems; i++)
{
- item_number_t *sp;
- item_number_t *sp1;
- int rule;
+ item_number *sp;
+ item_number *sp1;
+ rule_number r;
sp1 = sp = ritem + sitems[i];
while (*sp >= 0)
- sp++;
+ sp++;
- rule = item_number_as_rule_number (*sp);
+ r = item_number_as_rule_number (*sp);
- rule_lhs_print (&rules[rule], previous_lhs, out);
- previous_lhs = rules[rule].lhs;
+ rule_lhs_print (&rules[r], previous_lhs, out);
+ previous_lhs = rules[r].lhs;
- for (sp = rules[rule].rhs; sp < sp1; sp++)
- fprintf (out, " %s", symbols[*sp]->tag);
+ 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);
+ if (0 <= *rules[r].rhs)
+ for (/* Nothing */; 0 <= *sp; ++sp)
+ fprintf (out, " %s", symbols[*sp]->tag);
+ else
+ fprintf (out, " %%empty");
- /* Display the lookaheads? */
- if (report_flag & report_lookaheads)
- state_rule_lookaheads_print (state, &rules[rule], out);
+ /* Display the lookahead tokens? */
+ if (report_flag & report_lookahead_tokens
+ && item_number_is_rule_number (*sp1))
+ state_rule_lookahead_tokens_print (s, &rules[r], out);
fputc ('\n', out);
}
}
-/*----------------------------------------------------------------.
-| Report the shifts iff DISPLAY_SHIFTS_P or the gotos of STATE on |
-| OUT. |
-`----------------------------------------------------------------*/
+/*------------------------------------------------------------.
+| Report the shifts iff DISPLAY_SHIFTS_P or the gotos of S on |
+| OUT. |
+`------------------------------------------------------------*/
static void
-print_transitions (state_t *state, FILE *out, bool display_transitions_p)
+print_transitions (state *s, FILE *out, bool display_transitions_p)
{
- transitions_t *transitions = state->transitions;
+ transitions *trans = s->transitions;
size_t width = 0;
int i;
- /* Compute the width of the lookaheads column. */
- for (i = 0; i < transitions->num; i++)
- if (!TRANSITION_IS_DISABLED (transitions, i)
- && TRANSITION_IS_SHIFT (transitions, i) == display_transitions_p)
+ /* Compute the width of the lookahead token column. */
+ for (i = 0; i < trans->num; i++)
+ if (!TRANSITION_IS_DISABLED (trans, i)
+ && TRANSITION_IS_SHIFT (trans, i) == display_transitions_p)
{
- symbol_t *symbol = symbols[TRANSITION_SYMBOL (transitions, i)];
- max_length (&width, symbol->tag);
+ symbol *sym = symbols[TRANSITION_SYMBOL (trans, i)];
+ max_length (&width, sym->tag);
}
/* Nothing to report. */
fputc ('\n', out);
width += 2;
- /* Report lookaheads and shifts. */
- for (i = 0; i < transitions->num; i++)
- if (!TRANSITION_IS_DISABLED (transitions, i)
- && TRANSITION_IS_SHIFT (transitions, i) == display_transitions_p)
+ /* Report lookahead tokens and shifts. */
+ for (i = 0; i < trans->num; i++)
+ if (!TRANSITION_IS_DISABLED (trans, i)
+ && TRANSITION_IS_SHIFT (trans, i) == display_transitions_p)
{
- symbol_t *symbol = symbols[TRANSITION_SYMBOL (transitions, i)];
- const char *tag = symbol->tag;
- state_t *state1 = transitions->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"), state1->number);
- else
- fprintf (out, _("go to state %d\n"), state1->number);
+ 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 STATE raised from %nonassoc. |
-`------------------------------------------------------------*/
+/*--------------------------------------------------------.
+| 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_t *errp = state->errs;
+ errs *errp = s->errs;
size_t width = 0;
int i;
- /* Compute the width of the lookaheads column. */
+ /* Compute the width of the lookahead token column. */
for (i = 0; i < errp->num; ++i)
if (errp->symbols[i])
max_length (&width, errp->symbols[i]->tag);
fputc ('\n', out);
width += 2;
- /* Report lookaheads and errors. */
+ /* Report lookahead tokens 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);
+ 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);
}
}
-/*----------------------------------------------------------.
-| Return the default rule of this STATE if it has one, NULL |
-| otherwise. |
-`----------------------------------------------------------*/
-
-static rule_t *
-state_default_rule (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 redp->rules[0];
-
- /* 1. Each reduction is possibly masked by the lookaheads on which
- we shift (S/R conflicts)... */
- bitset_zero (shiftset);
- {
- transitions_t *transitions = state->transitions;
- FOR_EACH_SHIFT (transitions, i)
- {
- /* If this state has a shift for the error token, don't use a
- default rule. */
- if (TRANSITION_IS_ERROR (transitions, i))
- return NULL;
- bitset_set (shiftset, TRANSITION_SYMBOL (transitions, 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->num; i++)
- if (errp->symbols[i])
- bitset_set (shiftset, errp->symbols[i]->number);
- }
-
- for (i = 0; i < redp->num; ++i)
- {
- int count = 0;
-
- /* How many non-masked lookaheads are there for this reduction?
- */
- bitset_andn (lookaheadset, redp->lookaheads[i], shiftset);
- count = bitset_count (lookaheadset);
-
- if (count > cmax)
- {
- cmax = count;
- default_rule = redp->rules[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, redp->lookaheads[i]);
- }
-
- return default_rule;
-}
-
-
-/*--------------------------------------------------------------------.
-| 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). |
-`--------------------------------------------------------------------*/
+/*-------------------------------------------------------------------------.
+| Report a reduction of RULE on LOOKAHEAD_TOKEN (which can be 'default'). |
+| If not ENABLED, the rule is masked by a shift or a reduce (S/R and |
+| R/R conflicts). |
+`-------------------------------------------------------------------------*/
static void
print_reduction (FILE *out, size_t width,
- const char *lookahead,
- rule_t *rule, bool enabled)
+ const char *lookahead_token,
+ rule *r, bool enabled)
{
int j;
- fprintf (out, " %s", lookahead);
- for (j = width - strlen (lookahead); j > 0; --j)
+ fprintf (out, " %s", lookahead_token);
+ for (j = width - strlen (lookahead_token); j > 0; --j)
fputc (' ', out);
if (!enabled)
fputc ('[', out);
- if (rule->number)
- fprintf (out, _("reduce using rule %d (%s)"),
- rule->number, rule->lhs->tag);
+ if (r->number)
+ fprintf (out, _("reduce using rule %d (%s)"), r->number, r->lhs->tag);
else
fprintf (out, _("accept"));
if (!enabled)
}
-/*----------------------------------------------------.
-| Report on OUT the reduction actions of this STATE. |
-`----------------------------------------------------*/
+/*-------------------------------------------.
+| Report on OUT the reduction actions of S. |
+`-------------------------------------------*/
static void
-print_reductions (FILE *out, state_t *state)
+print_reductions (FILE *out, state *s)
{
- transitions_t *transitions = state->transitions;
- reductions_t *redp = state->reductions;
- rule_t *default_rule = NULL;
+ transitions *trans = s->transitions;
+ reductions *reds = s->reductions;
+ rule *default_reduction = NULL;
size_t width = 0;
int i, j;
+ bool default_reduction_only = true;
- if (redp->num == 0)
+ if (reds->num == 0)
return;
- default_rule = state_default_rule (state);
+ if (yydefact[s->number] != 0)
+ default_reduction = &rules[yydefact[s->number] - 1];
- bitset_zero (shiftset);
- FOR_EACH_SHIFT (transitions, i)
- bitset_set (shiftset, TRANSITION_SYMBOL (transitions, i));
+ bitset_zero (no_reduce_set);
+ FOR_EACH_SHIFT (trans, i)
+ bitset_set (no_reduce_set, TRANSITION_SYMBOL (trans, i));
+ for (i = 0; i < s->errs->num; ++i)
+ if (s->errs->symbols[i])
+ bitset_set (no_reduce_set, s->errs->symbols[i]->number);
- /* Compute the width of the lookaheads column. */
- if (default_rule)
+ /* Compute the width of the lookahead token column. */
+ if (default_reduction)
width = strlen (_("$default"));
- if (redp->lookaheads)
+ if (reds->lookahead_tokens)
for (i = 0; i < ntokens; i++)
{
- int count = bitset_test (shiftset, i);
-
- for (j = 0; j < redp->num; ++j)
- if (bitset_test (redp->lookaheads[j], i))
- {
- if (count == 0)
- {
- if (redp->rules[j] != default_rule)
- max_length (&width, symbols[i]->tag);
- count++;
- }
- else
- {
- max_length (&width, symbols[i]->tag);
- }
- }
+ bool count = bitset_test (no_reduce_set, i);
+
+ for (j = 0; j < reds->num; ++j)
+ if (bitset_test (reds->lookahead_tokens[j], i))
+ {
+ if (! count)
+ {
+ if (reds->rules[j] != default_reduction)
+ max_length (&width, symbols[i]->tag);
+ count = true;
+ }
+ else
+ {
+ max_length (&width, symbols[i]->tag);
+ }
+ }
}
/* Nothing to report. */
fputc ('\n', out);
width += 2;
- /* Report lookaheads (or $default) and reductions. */
- if (redp->lookaheads)
+ /* Report lookahead tokens (or $default) and reductions. */
+ if (reds->lookahead_tokens)
for (i = 0; i < ntokens; i++)
{
- int defaulted = 0;
- int count = bitset_test (shiftset, i);
-
- for (j = 0; j < redp->num; ++j)
- if (bitset_test (redp->lookaheads[j], i))
- {
- if (count == 0)
- {
- if (redp->rules[j] != default_rule)
- print_reduction (out, width,
- symbols[i]->tag,
- redp->rules[j], true);
- else
- defaulted = 1;
- count++;
- }
- else
- {
- if (defaulted)
- print_reduction (out, width,
- symbols[i]->tag,
- default_rule, true);
- defaulted = 0;
- print_reduction (out, width,
- symbols[i]->tag,
- redp->rules[j], false);
- }
- }
+ bool defaulted = false;
+ bool count = bitset_test (no_reduce_set, i);
+ if (count)
+ default_reduction_only = false;
+
+ for (j = 0; j < reds->num; ++j)
+ if (bitset_test (reds->lookahead_tokens[j], i))
+ {
+ if (! count)
+ {
+ if (reds->rules[j] != default_reduction)
+ {
+ default_reduction_only = false;
+ print_reduction (out, width,
+ symbols[i]->tag,
+ reds->rules[j], true);
+ }
+ else
+ defaulted = true;
+ count = true;
+ }
+ else
+ {
+ default_reduction_only = false;
+ if (defaulted)
+ print_reduction (out, width,
+ symbols[i]->tag,
+ default_reduction, true);
+ defaulted = false;
+ print_reduction (out, width,
+ symbols[i]->tag,
+ reds->rules[j], false);
+ }
+ }
}
- if (default_rule)
- print_reduction (out, width,
- _("$default"), default_rule, true);
+ if (default_reduction)
+ {
+ char *default_reductions =
+ muscle_percent_define_get ("lr.default-reduction");
+ print_reduction (out, width, _("$default"), default_reduction, true);
+ aver (STREQ (default_reductions, "most")
+ || (STREQ (default_reductions, "consistent")
+ && default_reduction_only)
+ || (reds->num == 1 && reds->rules[0]->number == 0));
+ free (default_reductions);
+ }
}
/*--------------------------------------------------------------.
| Report on OUT all the actions (shifts, gotos, reductions, and |
-| explicit erros from %nonassoc) of STATE. |
+| explicit erros from %nonassoc) of S. |
`--------------------------------------------------------------*/
static void
-print_actions (FILE *out, state_t *state)
+print_actions (FILE *out, state *s)
{
/* Print shifts. */
- print_transitions (state, out, true);
- print_errs (out, state);
- print_reductions (out, state);
+ print_transitions (s, out, true);
+ print_errs (out, s);
+ print_reductions (out, s);
/* Print gotos. */
- print_transitions (state, out, false);
+ print_transitions (s, out, false);
}
-/*--------------------------------------.
-| Report all the data on STATE on OUT. |
-`--------------------------------------*/
+/*----------------------------------.
+| Report all the data on S on OUT. |
+`----------------------------------*/
static void
-print_state (FILE *out, state_t *state)
+print_state (FILE *out, state *s)
{
fputs ("\n\n", out);
- fprintf (out, _("state %d"), state->number);
+ fprintf (out, _("State %d"), s->number);
fputc ('\n', out);
- print_core (out, state);
- print_actions (out, state);
- if ((report_flag & report_solved_conflicts)
- && state->solved_conflicts)
+ print_core (out, s);
+ print_actions (out, s);
+ if ((report_flag & report_solved_conflicts) && s->solved_conflicts)
{
fputc ('\n', out);
- fputs (state->solved_conflicts, out);
+ fputs (s->solved_conflicts, out);
}
}
\f
| Print information on the whole grammar. |
`-----------------------------------------*/
-#define END_TEST(End) \
-do { \
- if (column + strlen(buffer) > (End)) \
- { \
- fprintf (out, "%s\n ", buffer); \
- column = 3; \
- buffer[0] = 0; \
- } \
-} while (0)
+#define END_TEST(End) \
+ do { \
+ if (column + strlen (buffer) > (End)) \
+ { \
+ fprintf (out, "%s\n ", buffer); \
+ column = 3; \
+ buffer[0] = 0; \
+ } \
+ } while (0)
static void
print_grammar (FILE *out)
{
- symbol_number_t i;
+ 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 = symbols[token_translations[i]]->tag;
- rule_number_t r;
- item_number_t *rhsp;
-
- buffer[0] = 0;
- column = strlen (tag);
- fputs (tag, out);
- END_TEST (50);
- sprintf (buffer, " (%d)", 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);
- break;
- }
- fprintf (out, "%s\n", buffer);
+ 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 (65);
+ sprintf (buffer, " (%d)", 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);
+ break;
+ }
+ fprintf (out, "%s\n", buffer);
}
fputs ("\n\n", out);
for (i = ntokens; i < nsyms; i++)
{
int left_count = 0, right_count = 0;
- rule_number_t r;
+ rule_number r;
const char *tag = symbols[i]->tag;
for (r = 0; r < nrules; r++)
- {
- item_number_t *rhsp;
- if (rules[r].lhs->number == i)
- left_count++;
- for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++)
- if (item_number_as_symbol_number (*rhsp) == i)
- {
- right_count++;
- break;
- }
- }
+ {
+ item_number *rhsp;
+ if (rules[r].lhs->number == i)
+ left_count++;
+ for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++)
+ if (item_number_as_symbol_number (*rhsp) == i)
+ {
+ right_count++;
+ break;
+ }
+ }
buffer[0] = 0;
fputs (tag, out);
END_TEST (0);
if (left_count > 0)
- {
- END_TEST (50);
- sprintf (buffer + strlen (buffer), _(" on left:"));
-
- for (r = 0; r < nrules; r++)
- {
- END_TEST (65);
- if (rules[r].lhs->number == i)
- sprintf (buffer + strlen (buffer), " %d", r);
- }
- }
+ {
+ END_TEST (65);
+ sprintf (buffer + strlen (buffer), _(" on left:"));
+
+ for (r = 0; r < nrules; r++)
+ {
+ if (rules[r].lhs->number == i)
+ {
+ END_TEST (65);
+ sprintf (buffer + strlen (buffer), " %d", r);
+ }
+ }
+ }
if (right_count > 0)
- {
- if (left_count > 0)
- sprintf (buffer + strlen (buffer), ",");
- END_TEST (50);
- sprintf (buffer + strlen (buffer), _(" on right:"));
- for (r = 0; r < nrules; r++)
- {
- 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);
- break;
- }
- }
- }
+ {
+ if (left_count > 0)
+ sprintf (buffer + strlen (buffer), ",");
+ END_TEST (65);
+ sprintf (buffer + strlen (buffer), _(" on right:"));
+ for (r = 0; r < nrules; r++)
+ {
+ 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);
+ break;
+ }
+ }
+ }
fprintf (out, "%s\n", buffer);
}
}
void
print_results (void)
{
- state_number_t i;
+ state_number i;
/* We used to use just .out if SPEC_NAME_PREFIX (-p) was used, but
that conflicts with Posix. */
reduce_output (out);
grammar_rules_partial_print (out,
- _("Rules never reduced"), rule_never_reduced_p);
+ _("Rules useless in parser due to conflicts"),
+ rule_useless_in_parser_p);
conflicts_output (out);
print_grammar (out);
/* If the whole state item sets, not only the kernels, are wanted,
- `closure' will be run, which needs memory allocation/deallocation. */
+ '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);
+ no_reduce_set = bitset_create (ntokens, BITSET_FIXED);
for (i = 0; i < nstates; i++)
print_state (out, states[i]);
- bitset_free (shiftset);
- bitset_free (lookaheadset);
+ bitset_free (no_reduce_set);
if (report_flag & report_itemsets)
free_closure ();
projects / bison.git / blobdiff