-/* Find and resolve or report look-ahead conflicts for bison,
- Copyright 1984, 1989, 1992, 2000, 2001 Free Software Foundation, Inc.
+/* Find and resolve or report lookahead conflicts for bison,
+
+ Copyright (C) 1984, 1989, 1992, 2000-2011 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 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.
+ 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 3 of the License, or
+ (at your option) any later version.
- Bison 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.
+ 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 <bitset.h>
+
+#include "LR0.h"
#include "complain.h"
-#include "getargs.h"
+#include "conflicts.h"
#include "files.h"
+#include "getargs.h"
#include "gram.h"
-#include "state.h"
#include "lalr.h"
-#include "conflicts.h"
+#include "print-xml.h"
#include "reader.h"
-#include "LR0.h"
+#include "state.h"
+#include "symtab.h"
-errs **err_table = NULL;
/* -1 stands for not specified. */
-int expected_conflicts = -1;
-static char *conflicts = NULL;
+int expected_sr_conflicts = -1;
+int expected_rr_conflicts = -1;
+static char *conflicts;
+static struct obstack solved_conflicts_obstack;
+static struct obstack solved_conflicts_xml_obstack;
+
+static bitset shift_set;
+static bitset lookahead_set;
-static unsigned *shiftset = NULL;
-static unsigned *lookaheadset = NULL;
\f
+enum conflict_resolution
+ {
+ shift_resolution,
+ reduce_resolution,
+ left_resolution,
+ right_resolution,
+ nonassoc_resolution
+ };
+
+
+/*----------------------------------------------------------------.
+| Explain how an SR conflict between TOKEN and RULE was resolved: |
+| RESOLUTION. |
+`----------------------------------------------------------------*/
+
static inline void
-log_resolution (int state, int LAno, int token, char *resolution)
+log_resolution (rule *r, symbol_number token,
+ enum conflict_resolution resolution)
{
- obstack_fgrow4 (&output_obstack,
- _("\
-Conflict in state %d between rule %d and token %s resolved as %s.\n"),
- state, LAruleno[LAno], tags[token], resolution);
+ if (report_flag & report_solved_conflicts)
+ {
+ /* The description of the resolution. */
+ switch (resolution)
+ {
+ case shift_resolution:
+ case right_resolution:
+ obstack_fgrow2 (&solved_conflicts_obstack,
+ _(" Conflict between rule %d and token %s"
+ " resolved as shift"),
+ r->number,
+ symbols[token]->tag);
+ break;
+
+ case reduce_resolution:
+ case left_resolution:
+ obstack_fgrow2 (&solved_conflicts_obstack,
+ _(" Conflict between rule %d and token %s"
+ " resolved as reduce"),
+ r->number,
+ symbols[token]->tag);
+ break;
+
+ case nonassoc_resolution:
+ obstack_fgrow2 (&solved_conflicts_obstack,
+ _(" Conflict between rule %d and token %s"
+ " resolved as an error"),
+ r->number,
+ symbols[token]->tag);
+ break;
+ }
+
+ /* The reason. */
+ switch (resolution)
+ {
+ case shift_resolution:
+ obstack_fgrow2 (&solved_conflicts_obstack,
+ " (%s < %s)",
+ r->prec->tag,
+ symbols[token]->tag);
+ break;
+
+ case reduce_resolution:
+ obstack_fgrow2 (&solved_conflicts_obstack,
+ " (%s < %s)",
+ symbols[token]->tag,
+ r->prec->tag);
+ break;
+
+ case left_resolution:
+ obstack_fgrow1 (&solved_conflicts_obstack,
+ " (%%left %s)",
+ symbols[token]->tag);
+ break;
+
+ case right_resolution:
+ obstack_fgrow1 (&solved_conflicts_obstack,
+ " (%%right %s)",
+ symbols[token]->tag);
+ break;
+
+ case nonassoc_resolution:
+ obstack_fgrow1 (&solved_conflicts_obstack,
+ " (%%nonassoc %s)",
+ symbols[token]->tag);
+ break;
+ }
+
+ obstack_sgrow (&solved_conflicts_obstack, ".\n");
+ }
+
+ /* XML report */
+ if (xml_flag)
+ {
+ /* The description of the resolution. */
+ switch (resolution)
+ {
+ case shift_resolution:
+ case right_resolution:
+ obstack_fgrow2 (&solved_conflicts_xml_obstack,
+ " <resolution rule=\"%d\" symbol=\"%s\""
+ " type=\"shift\">",
+ r->number,
+ xml_escape (symbols[token]->tag));
+ break;
+
+ case reduce_resolution:
+ case left_resolution:
+ obstack_fgrow2 (&solved_conflicts_xml_obstack,
+ " <resolution rule=\"%d\" symbol=\"%s\""
+ " type=\"reduce\">",
+ r->number,
+ xml_escape (symbols[token]->tag));
+ break;
+
+ case nonassoc_resolution:
+ obstack_fgrow2 (&solved_conflicts_xml_obstack,
+ " <resolution rule=\"%d\" symbol=\"%s\""
+ " type=\"error\">",
+ r->number,
+ xml_escape (symbols[token]->tag));
+ break;
+ }
+
+ /* The reason. */
+ switch (resolution)
+ {
+ case shift_resolution:
+ obstack_fgrow2 (&solved_conflicts_xml_obstack,
+ "%s < %s",
+ xml_escape_n (0, r->prec->tag),
+ xml_escape_n (1, symbols[token]->tag));
+ break;
+
+ case reduce_resolution:
+ obstack_fgrow2 (&solved_conflicts_xml_obstack,
+ "%s < %s",
+ xml_escape_n (0, symbols[token]->tag),
+ xml_escape_n (1, r->prec->tag));
+ break;
+
+ case left_resolution:
+ obstack_fgrow1 (&solved_conflicts_xml_obstack,
+ "%%left %s",
+ xml_escape (symbols[token]->tag));
+ break;
+
+ case right_resolution:
+ obstack_fgrow1 (&solved_conflicts_xml_obstack,
+ "%%right %s",
+ xml_escape (symbols[token]->tag));
+ break;
+
+ case nonassoc_resolution:
+ obstack_fgrow1 (&solved_conflicts_xml_obstack,
+ "%%nonassoc %s",
+ xml_escape (symbols[token]->tag));
+ break;
+ }
+
+ obstack_sgrow (&solved_conflicts_xml_obstack, "</resolution>\n");
+ }
}
/*------------------------------------------------------------------.
| Turn off the shift recorded for the specified token in the |
| specified state. Used when we resolve a shift-reduce conflict in |
-| favor of the reduction. |
+| favor of the reduction or as an error (%nonassoc). |
`------------------------------------------------------------------*/
static void
-flush_shift (int state, int token)
+flush_shift (state *s, int token)
{
- shifts *shiftp;
- int k, i;
+ transitions *trans = s->transitions;
+ int i;
- shiftp = state_table[state].shift_table;
+ bitset_reset (lookahead_set, token);
+ for (i = 0; i < trans->num; i++)
+ if (!TRANSITION_IS_DISABLED (trans, i)
+ && TRANSITION_SYMBOL (trans, i) == token)
+ TRANSITION_DISABLE (trans, i);
+}
- if (shiftp)
- {
- k = shiftp->nshifts;
- for (i = 0; i < k; i++)
- {
- if (shiftp->shifts[i]
- && token == state_table[shiftp->shifts[i]].accessing_symbol)
- (shiftp->shifts[i]) = 0;
- }
- }
+
+/*--------------------------------------------------------------------.
+| Turn off the reduce recorded for the specified token in the |
+| specified lookahead set. Used when we resolve a shift-reduce |
+| conflict in favor of the shift or as an error (%nonassoc). |
+`--------------------------------------------------------------------*/
+
+static void
+flush_reduce (bitset lookahead_tokens, int token)
+{
+ bitset_reset (lookahead_tokens, token);
}
| precedence declarations. It has already been checked that the |
| rule has a precedence. A conflict is resolved by modifying the |
| shift or reduce tables so that there is no longer a conflict. |
+| |
+| RULENO is the number of the lookahead bitset to consider. |
+| |
+| ERRORS and NERRS can be used to store discovered explicit |
+| errors. |
`------------------------------------------------------------------*/
static void
-resolve_sr_conflict (int state, int lookaheadnum)
+resolve_sr_conflict (state *s, int ruleno, symbol **errors, int *nerrs)
{
- int i;
- int mask;
- unsigned *fp1;
- unsigned *fp2;
- int redprec;
- errs *errp = (errs *) xcalloc (sizeof (errs) + ntokens * sizeof (short), 1);
- short *errtokens = errp->errs;
-
- /* find the rule to reduce by to get precedence of reduction */
- redprec = rprec[LAruleno[lookaheadnum]];
-
- mask = 1;
- fp1 = LA + lookaheadnum * tokensetsize;
- fp2 = lookaheadset;
+ symbol_number i;
+ reductions *reds = s->reductions;
+ /* Find the rule to reduce by to get precedence of reduction. */
+ rule *redrule = reds->rules[ruleno];
+ int redprec = redrule->prec->prec;
+ bitset lookahead_tokens = reds->lookahead_tokens[ruleno];
+
for (i = 0; i < ntokens; i++)
- {
- if ((mask & *fp2 & *fp1) && sprec[i])
+ if (bitset_test (lookahead_tokens, i)
+ && bitset_test (lookahead_set, i)
+ && symbols[i]->prec)
+ {
/* Shift-reduce conflict occurs for token number i
and it has a precedence.
The precedence of shifting is that of token i. */
- {
- if (sprec[i] < redprec)
- {
- log_resolution (state, lookaheadnum, i, _("reduce"));
- *fp2 &= ~mask; /* flush the shift for this token */
- flush_shift (state, i);
- }
- else if (sprec[i] > redprec)
- {
- log_resolution (state, lookaheadnum, i, _("shift"));
- *fp1 &= ~mask; /* flush the reduce for this token */
- }
- else
+ if (symbols[i]->prec < redprec)
+ {
+ log_resolution (redrule, i, reduce_resolution);
+ flush_shift (s, i);
+ }
+ else if (symbols[i]->prec > redprec)
+ {
+ log_resolution (redrule, i, shift_resolution);
+ flush_reduce (lookahead_tokens, i);
+ }
+ else
+ /* Matching precedence levels.
+ For non-defined associativity, keep both: unexpected
+ associativity conflict.
+ For left associativity, keep only the reduction.
+ For right associativity, keep only the shift.
+ For nonassociativity, keep neither. */
+
+ switch (symbols[i]->assoc)
{
- /* Matching precedence levels.
- For left association, keep only the reduction.
- For right association, keep only the shift.
- For nonassociation, keep neither. */
-
- switch (sassoc[i])
- {
- case right_assoc:
- log_resolution (state, lookaheadnum, i, _("shift"));
- break;
-
- case left_assoc:
- log_resolution (state, lookaheadnum, i, _("reduce"));
- break;
-
- case non_assoc:
- log_resolution (state, lookaheadnum, i, _("an error"));
- break;
- }
-
- if (sassoc[i] != right_assoc)
- {
- *fp2 &= ~mask; /* flush the shift for this token */
- flush_shift (state, i);
- }
- if (sassoc[i] != left_assoc)
- {
- *fp1 &= ~mask; /* flush the reduce for this token */
- }
- if (sassoc[i] == non_assoc)
- {
- /* Record an explicit error for this token. */
- *errtokens++ = i;
- }
+ case undef_assoc:
+ abort ();
+
+ case precedence_assoc:
+ break;
+
+ case right_assoc:
+ log_resolution (redrule, i, right_resolution);
+ flush_reduce (lookahead_tokens, i);
+ break;
+
+ case left_assoc:
+ log_resolution (redrule, i, left_resolution);
+ flush_shift (s, i);
+ break;
+
+ case non_assoc:
+ log_resolution (redrule, i, nonassoc_resolution);
+ flush_shift (s, i);
+ flush_reduce (lookahead_tokens, i);
+ /* Record an explicit error for this token. */
+ errors[(*nerrs)++] = symbols[i];
+ break;
}
- }
-
- mask <<= 1;
- if (mask == 0)
- {
- mask = 1;
- fp2++;
- fp1++;
- }
- }
- errp->nerrs = errtokens - errp->errs;
- if (errp->nerrs)
- {
- /* Some tokens have been explicitly made errors. Allocate
- a permanent errs structure for this state, to record them. */
- i = (char *) errtokens - (char *) errp;
- err_table[state] = (errs *) xcalloc ((unsigned int) i, 1);
- bcopy (errp, err_table[state], i);
- }
- else
- err_table[state] = 0;
- free (errp);
+ }
}
+/*-------------------------------------------------------------------.
+| Solve the S/R conflicts of state S using the |
+| precedence/associativity, and flag it inconsistent if it still has |
+| conflicts. ERRORS can be used as storage to compute the list of |
+| lookahead tokens on which S raises a syntax error (%nonassoc). |
+`-------------------------------------------------------------------*/
+
static void
-set_conflicts (int state)
+set_conflicts (state *s, symbol **errors)
{
int i;
- int k;
- shifts *shiftp;
- unsigned *fp2;
- unsigned *fp3;
- unsigned *fp4;
- unsigned *fp1;
- int symbol;
-
- if (state_table[state].consistent)
- return;
+ transitions *trans = s->transitions;
+ reductions *reds = s->reductions;
+ int nerrs = 0;
- for (i = 0; i < tokensetsize; i++)
- lookaheadset[i] = 0;
+ if (s->consistent)
+ return;
- shiftp = state_table[state].shift_table;
- if (shiftp)
- {
- k = shiftp->nshifts;
- for (i = 0; i < k; i++)
- {
- symbol = state_table[shiftp->shifts[i]].accessing_symbol;
- if (ISVAR (symbol))
- break;
- SETBIT (lookaheadset, symbol);
- }
- }
+ bitset_zero (lookahead_set);
- k = state_table[state + 1].lookaheads;
- fp4 = lookaheadset + tokensetsize;
+ FOR_EACH_SHIFT (trans, i)
+ bitset_set (lookahead_set, TRANSITION_SYMBOL (trans, i));
/* Loop over all rules which require lookahead in this state. First
check for shift-reduce conflict, and try to resolve using
- precedence */
- for (i = state_table[state].lookaheads; i < k; i++)
- if (rprec[LAruleno[i]])
- {
- fp1 = LA + i * tokensetsize;
- fp2 = fp1;
- fp3 = lookaheadset;
-
- while (fp3 < fp4)
- {
- if (*fp2++ & *fp3++)
- {
- resolve_sr_conflict (state, i);
- break;
- }
- }
- }
+ precedence. */
+ for (i = 0; i < reds->num; ++i)
+ if (reds->rules[i]->prec && reds->rules[i]->prec->prec
+ && !bitset_disjoint_p (reds->lookahead_tokens[i], lookahead_set))
+ resolve_sr_conflict (s, i, errors, &nerrs);
+ if (nerrs)
+ {
+ /* Some tokens have been explicitly made errors. Allocate a
+ permanent errs structure for this state, to record them. */
+ state_errs_set (s, nerrs, errors);
+ }
+ if (obstack_object_size (&solved_conflicts_obstack))
+ {
+ obstack_1grow (&solved_conflicts_obstack, '\0');
+ s->solved_conflicts = obstack_finish (&solved_conflicts_obstack);
+ }
+ if (obstack_object_size (&solved_conflicts_xml_obstack))
+ {
+ obstack_1grow (&solved_conflicts_xml_obstack, '\0');
+ s->solved_conflicts_xml = obstack_finish (&solved_conflicts_xml_obstack);
+ }
/* Loop over all rules which require lookahead in this state. Check
for conflicts not resolved above. */
- for (i = state_table[state].lookaheads; i < k; i++)
+ for (i = 0; i < reds->num; ++i)
{
- fp1 = LA + i * tokensetsize;
- fp2 = fp1;
- fp3 = lookaheadset;
-
- while (fp3 < fp4)
- if (*fp2++ & *fp3++)
- conflicts[state] = 1;
-
- fp2 = fp1;
- fp3 = lookaheadset;
-
- while (fp3 < fp4)
- *fp3++ |= *fp2++;
+ if (!bitset_disjoint_p (reds->lookahead_tokens[i], lookahead_set))
+ conflicts[s->number] = 1;
+ bitset_or (lookahead_set, lookahead_set, reds->lookahead_tokens[i]);
}
}
+
+/*----------------------------------------------------------------.
+| Solve all the S/R conflicts using the precedence/associativity, |
+| and flag as inconsistent the states that still have conflicts. |
+`----------------------------------------------------------------*/
+
void
-solve_conflicts (void)
+conflicts_solve (void)
{
- int i;
-
- conflicts = XCALLOC (char, nstates);
- shiftset = XCALLOC (unsigned, tokensetsize);
- lookaheadset = XCALLOC (unsigned, tokensetsize);
+ state_number i;
+ /* List of lookahead tokens on which we explicitly raise a syntax error. */
+ symbol **errors = xnmalloc (ntokens + 1, sizeof *errors);
- err_table = XCALLOC (errs *, nstates);
+ conflicts = xcalloc (nstates, sizeof *conflicts);
+ shift_set = bitset_create (ntokens, BITSET_FIXED);
+ lookahead_set = bitset_create (ntokens, BITSET_FIXED);
+ obstack_init (&solved_conflicts_obstack);
+ obstack_init (&solved_conflicts_xml_obstack);
for (i = 0; i < nstates; i++)
- set_conflicts (i);
+ {
+ set_conflicts (states[i], errors);
+
+ /* For uniformity of the code, make sure all the states have a valid
+ `errs' member. */
+ if (!states[i]->errs)
+ states[i]->errs = errs_new (0, 0);
+ }
+
+ free (errors);
+}
+
+
+void
+conflicts_update_state_numbers (state_number old_to_new[],
+ state_number nstates_old)
+{
+ state_number i;
+ for (i = 0; i < nstates_old; ++i)
+ if (old_to_new[i] != nstates_old)
+ conflicts[old_to_new[i]] = conflicts[i];
}
`---------------------------------------------*/
static int
-count_sr_conflicts (int state)
+count_sr_conflicts (state *s)
{
int i;
- int k;
- int mask;
- shifts *shiftp;
- unsigned *fp1;
- unsigned *fp2;
- unsigned *fp3;
- int symbol;
-
int src_count = 0;
+ transitions *trans = s->transitions;
+ reductions *reds = s->reductions;
- shiftp = state_table[state].shift_table;
- if (!shiftp)
+ if (!trans)
return 0;
- for (i = 0; i < tokensetsize; i++)
- {
- shiftset[i] = 0;
- lookaheadset[i] = 0;
- }
-
- k = shiftp->nshifts;
- for (i = 0; i < k; i++)
- {
- if (!shiftp->shifts[i])
- continue;
- symbol = state_table[shiftp->shifts[i]].accessing_symbol;
- if (ISVAR (symbol))
- break;
- SETBIT (shiftset, symbol);
- }
-
- k = state_table[state + 1].lookaheads;
- fp3 = lookaheadset + tokensetsize;
-
- for (i = state_table[state].lookaheads; i < k; i++)
- {
- fp1 = LA + i * tokensetsize;
- fp2 = lookaheadset;
-
- while (fp2 < fp3)
- *fp2++ |= *fp1++;
- }
+ bitset_zero (lookahead_set);
+ bitset_zero (shift_set);
- fp1 = shiftset;
- fp2 = lookaheadset;
+ FOR_EACH_SHIFT (trans, i)
+ bitset_set (shift_set, TRANSITION_SYMBOL (trans, i));
- while (fp2 < fp3)
- *fp2++ &= *fp1++;
+ for (i = 0; i < reds->num; ++i)
+ bitset_or (lookahead_set, lookahead_set, reds->lookahead_tokens[i]);
- mask = 1;
- fp2 = lookaheadset;
- for (i = 0; i < ntokens; i++)
- {
- if (mask & *fp2)
- src_count++;
+ bitset_and (lookahead_set, lookahead_set, shift_set);
- mask <<= 1;
- if (mask == 0)
- {
- mask = 1;
- fp2++;
- }
- }
+ src_count = bitset_count (lookahead_set);
return src_count;
}
-/*----------------------------------------------.
-| Count the number of reduce/reduce conflicts. |
-`----------------------------------------------*/
+/*----------------------------------------------------------------.
+| Count the number of reduce/reduce conflicts. If ONE_PER_TOKEN, |
+| count one conflict for each token that has any reduce/reduce |
+| conflicts. Otherwise, count one conflict for each pair of |
+| conflicting reductions. |
++`----------------------------------------------------------------*/
static int
-count_rr_conflicts (int state)
+count_rr_conflicts (state *s, bool one_per_token)
{
int i;
- unsigned mask;
- unsigned *baseword;
-
+ reductions *reds = s->reductions;
int rrc_count = 0;
- int m = state_table[state].lookaheads;
- int n = state_table[state + 1].lookaheads;
-
- if (n - m < 2)
- return 0;
-
- mask = 1;
- baseword = LA + m * tokensetsize;
for (i = 0; i < ntokens; i++)
{
- unsigned *wordp = baseword;
-
int count = 0;
int j;
- for (j = m; j < n; j++)
- {
- if (mask & *wordp)
- count++;
-
- wordp += tokensetsize;
- }
+ for (j = 0; j < reds->num; ++j)
+ if (bitset_test (reds->lookahead_tokens[j], i))
+ count++;
if (count >= 2)
- rrc_count++;
-
- mask <<= 1;
- if (mask == 0)
- {
- mask = 1;
- baseword++;
- }
+ rrc_count += one_per_token ? 1 : count-1;
}
return rrc_count;
}
-/*--------------------------------------------------------------.
-| Return a human readable string which reports shift/reduce and |
-| reduce/reduce conflict numbers (SRC_NUM, RRC_NUM). |
-`--------------------------------------------------------------*/
-static const char *
-conflict_report (int src_num, int rrc_num)
-{
- static char res[4096];
- char *cp = res;
+/*--------------------------------------------------------.
+| Report the number of conflicts, using the Yacc format. |
+`--------------------------------------------------------*/
- if (src_num >= 1)
- {
- sprintf (cp, ngettext ("%d shift/reduce conflict",
- "%d shift/reduce conflicts", src_num), src_num);
- cp += strlen (cp);
- }
-
- if (src_num > 0 && rrc_num > 0)
- {
- sprintf (cp, " %s ", _("and"));
- cp += strlen (cp);
- }
-
- if (rrc_num >= 1)
- {
- sprintf (cp, ngettext ("%d reduce/reduce conflict",
- "%d reduce/reduce conflicts", rrc_num), rrc_num);
- cp += strlen (cp);
- }
-
- *cp++ = '.';
- *cp++ = '\n';
- *cp++ = '\0';
-
- return res;
+static void
+conflict_report (FILE *out, int src_num, int rrc_num)
+{
+ if (src_num && rrc_num)
+ fprintf (out, _("conflicts: %d shift/reduce, %d reduce/reduce\n"),
+ src_num, rrc_num);
+ else if (src_num)
+ fprintf (out, _("conflicts: %d shift/reduce\n"), src_num);
+ else if (rrc_num)
+ fprintf (out, _("conflicts: %d reduce/reduce\n"), rrc_num);
}
void
conflicts_output (FILE *out)
{
- int i;
+ bool printed_sth = false;
+ state_number i;
+ for (i = 0; i < nstates; i++)
+ {
+ state *s = states[i];
+ if (conflicts[i])
+ {
+ fprintf (out, _("State %d "), i);
+ conflict_report (out, count_sr_conflicts (s),
+ count_rr_conflicts (s, true));
+ printed_sth = true;
+ }
+ }
+ if (printed_sth)
+ fputs ("\n\n", out);
+}
+
+/*--------------------------------------------------------.
+| Total the number of S/R and R/R conflicts. Unlike the |
+| code in conflicts_output, however, count EACH pair of |
+| reductions for the same state and lookahead as one |
+| conflict. |
+`--------------------------------------------------------*/
+
+int
+conflicts_total_count (void)
+{
+ state_number i;
+ int count;
+
+ /* Conflicts by state. */
+ count = 0;
for (i = 0; i < nstates; i++)
if (conflicts[i])
{
- fprintf (out, _("State %d contains "), i);
- fputs (conflict_report (count_sr_conflicts (i),
- count_rr_conflicts (i)), out);
+ count += count_sr_conflicts (states[i]);
+ count += count_rr_conflicts (states[i], false);
}
+ return count;
}
void
conflicts_print (void)
{
- int i;
+ /* Is the number of SR conflicts OK? Either EXPECTED_CONFLICTS is
+ not set, and then we want 0 SR, or else it is specified, in which
+ case we want equality. */
+ bool src_ok;
+ bool rrc_ok;
int src_total = 0;
int rrc_total = 0;
+ int src_expected;
+ int rrc_expected;
/* Conflicts by state. */
- for (i = 0; i < nstates; i++)
- if (conflicts[i])
- {
- src_total += count_sr_conflicts (i);
- rrc_total += count_rr_conflicts (i);
- }
+ {
+ state_number i;
- /* Report the total number of conflicts on STDERR. */
- if (src_total || rrc_total)
- {
- if (yacc_flag)
+ for (i = 0; i < nstates; i++)
+ if (conflicts[i])
{
- /* If invoked with `--yacc', use the output format specified by
- POSIX. */
- fprintf (stderr, _("conflicts: "));
- if (src_total > 0)
- fprintf (stderr, _(" %d shift/reduce"), src_total);
- if (src_total > 0 && rrc_total > 0)
- fprintf (stderr, ",");
- if (rrc_total > 0)
- fprintf (stderr, _(" %d reduce/reduce"), rrc_total);
- putc ('\n', stderr);
+ src_total += count_sr_conflicts (states[i]);
+ rrc_total += count_rr_conflicts (states[i], true);
}
- else
- {
- fprintf (stderr, _("%s contains "), infile);
- fputs (conflict_report (src_total, rrc_total), stderr);
- }
- }
+ }
- if (expected_conflicts != -1
- && src_total != expected_conflicts)
+ if (! glr_parser && rrc_total > 0 && expected_rr_conflicts != -1)
{
- complain_message_count++;
- fprintf (stderr, ngettext ("expected %d shift/reduce conflict",
- "expected %d shift/reduce conflicts",
- expected_conflicts),
- expected_conflicts);
+ warn (_("%%expect-rr applies only to GLR parsers"));
+ expected_rr_conflicts = -1;
}
-}
+ src_expected = expected_sr_conflicts == -1 ? 0 : expected_sr_conflicts;
+ rrc_expected = expected_rr_conflicts == -1 ? 0 : expected_rr_conflicts;
+ src_ok = src_total == src_expected;
+ rrc_ok = rrc_total == rrc_expected;
-void
-print_reductions (FILE *out, int state)
-{
- int i;
- int j;
- int k;
- unsigned *fp1;
- unsigned *fp2;
- unsigned *fp3;
- unsigned *fp4;
- int rule;
- int symbol;
- unsigned mask;
- int m;
- int n;
- int default_LA;
- int default_rule = 0;
- int cmax;
- int count;
- shifts *shiftp;
- errs *errp;
- int nodefault = 0;
-
- for (i = 0; i < tokensetsize; i++)
- shiftset[i] = 0;
-
- shiftp = state_table[state].shift_table;
- if (shiftp)
- {
- k = shiftp->nshifts;
- for (i = 0; i < k; i++)
- {
- if (!shiftp->shifts[i])
- continue;
- symbol = state_table[shiftp->shifts[i]].accessing_symbol;
- if (ISVAR (symbol))
- break;
- /* if this state has a shift for the error token,
- don't use a default rule. */
- if (symbol == error_token_number)
- nodefault = 1;
- SETBIT (shiftset, symbol);
- }
- }
+ /* If there are as many RR conflicts and SR conflicts as
+ expected, then there is nothing to report. */
+ if (rrc_ok & src_ok)
+ return;
- errp = err_table[state];
- if (errp)
+ /* Report the total number of conflicts on STDERR. */
+ if (src_total | rrc_total)
{
- k = errp->nerrs;
- for (i = 0; i < k; i++)
- {
- if (!errp->errs[i])
- continue;
- symbol = errp->errs[i];
- SETBIT (shiftset, symbol);
- }
+ if (! yacc_flag)
+ fprintf (stderr, "%s: ", current_file);
+ conflict_report (stderr, src_total, rrc_total);
}
- m = state_table[state].lookaheads;
- n = state_table[state + 1].lookaheads;
-
- if (n - m == 1 && !nodefault)
- {
- default_rule = LAruleno[m];
-
- fp1 = LA + m * tokensetsize;
- fp2 = shiftset;
- fp3 = lookaheadset;
- fp4 = lookaheadset + tokensetsize;
-
- while (fp3 < fp4)
- *fp3++ = *fp1++ & *fp2++;
-
- mask = 1;
- fp3 = lookaheadset;
-
- for (i = 0; i < ntokens; i++)
- {
- if (mask & *fp3)
- fprintf (out, _(" %-4s\t[reduce using rule %d (%s)]\n"),
- tags[i], default_rule, tags[rlhs[default_rule]]);
-
- mask <<= 1;
- if (mask == 0)
- {
- mask = 1;
- fp3++;
- }
- }
-
- fprintf (out, _(" $default\treduce using rule %d (%s)\n\n"),
- default_rule, tags[rlhs[default_rule]]);
- }
- else if (n - m >= 1)
+ if (expected_sr_conflicts != -1 || expected_rr_conflicts != -1)
{
- cmax = 0;
- default_LA = -1;
- fp4 = lookaheadset + tokensetsize;
-
- if (!nodefault)
- for (i = m; i < n; i++)
- {
- fp1 = LA + i * tokensetsize;
- fp2 = shiftset;
- fp3 = lookaheadset;
-
- while (fp3 < fp4)
- *fp3++ = *fp1++ & (~(*fp2++));
-
- count = 0;
- mask = 1;
- fp3 = lookaheadset;
- for (j = 0; j < ntokens; j++)
- {
- if (mask & *fp3)
- count++;
-
- mask <<= 1;
- if (mask == 0)
- {
- mask = 1;
- fp3++;
- }
- }
-
- if (count > cmax)
- {
- cmax = count;
- default_LA = i;
- default_rule = LAruleno[i];
- }
-
- fp2 = shiftset;
- fp3 = lookaheadset;
-
- while (fp3 < fp4)
- *fp2++ |= *fp3++;
- }
-
- for (i = 0; i < tokensetsize; i++)
- shiftset[i] = 0;
-
- if (shiftp)
- {
- k = shiftp->nshifts;
- for (i = 0; i < k; i++)
- {
- if (!shiftp->shifts[i])
- continue;
- symbol = state_table[shiftp->shifts[i]].accessing_symbol;
- if (ISVAR (symbol))
- break;
- SETBIT (shiftset, symbol);
- }
- }
-
- mask = 1;
- fp1 = LA + m * tokensetsize;
- fp2 = shiftset;
- for (i = 0; i < ntokens; i++)
- {
- int defaulted = 0;
-
- if (mask & *fp2)
- count = 1;
- else
- count = 0;
-
- fp3 = fp1;
- for (j = m; j < n; j++)
- {
- if (mask & *fp3)
- {
- if (count == 0)
- {
- if (j != default_LA)
- {
- rule = LAruleno[j];
- fprintf (out,
- _(" %-4s\treduce using rule %d (%s)\n"),
- tags[i], rule, tags[rlhs[rule]]);
- }
- else
- defaulted = 1;
-
- count++;
- }
- else
- {
- if (defaulted)
- {
- rule = LAruleno[default_LA];
- fprintf (out,
- _(" %-4s\treduce using rule %d (%s)\n"),
- tags[i], rule, tags[rlhs[rule]]);
- defaulted = 0;
- }
- rule = LAruleno[j];
- fprintf (out,
- _(" %-4s\t[reduce using rule %d (%s)]\n"),
- tags[i], rule, tags[rlhs[rule]]);
- }
- }
-
- fp3 += tokensetsize;
- }
-
- mask <<= 1;
- if (mask == 0)
- {
- mask = 1;
- /* We tried incrementing just fp1, and just fp2; both seem wrong.
- It seems necessary to increment both in sync. */
- fp1++;
- fp2++;
- }
- }
-
- if (default_LA >= 0)
- fprintf (out, _(" $default\treduce using rule %d (%s)\n"),
- default_rule, tags[rlhs[default_rule]]);
+ if (! src_ok)
+ complain (ngettext ("expected %d shift/reduce conflict",
+ "expected %d shift/reduce conflicts",
+ src_expected),
+ src_expected);
+ if (! rrc_ok)
+ complain (ngettext ("expected %d reduce/reduce conflict",
+ "expected %d reduce/reduce conflicts",
+ rrc_expected),
+ rrc_expected);
}
}
void
-free_conflicts (void)
+conflicts_free (void)
{
- XFREE (conflicts);
- XFREE (shiftset);
- XFREE (lookaheadset);
+ free (conflicts);
+ bitset_free (shift_set);
+ bitset_free (lookahead_set);
+ obstack_free (&solved_conflicts_obstack, NULL);
+ obstack_free (&solved_conflicts_xml_obstack, NULL);
}
projects / bison.git / blobdiff