/* Find and resolve or report lookahead conflicts for bison,
- Copyright (C) 1984, 1989, 1992, 2000-2012 Free Software Foundation,
+ Copyright (C) 1984, 1989, 1992, 2000-2013 Free Software Foundation,
Inc.
This file is part of Bison, the GNU Compiler Compiler.
The precedence of shifting is that of token i. */
if (symbols[i]->prec < redprec)
{
+ register_precedence (redrule->prec->number, i);
log_resolution (redrule, i, reduce_resolution);
flush_shift (s, i);
}
else if (symbols[i]->prec > redprec)
{
+ register_precedence (i, redrule->prec->number);
log_resolution (redrule, i, shift_resolution);
flush_reduce (lookahead_tokens, i);
}
break;
case right_assoc:
+ register_assoc (i, redrule->prec->number);
log_resolution (redrule, i, right_resolution);
flush_reduce (lookahead_tokens, i);
break;
case left_assoc:
+ register_assoc (i, redrule->prec->number);
log_resolution (redrule, i, left_resolution);
flush_shift (s, i);
break;
case non_assoc:
+ register_assoc (i, redrule->prec->number);
log_resolution (redrule, i, nonassoc_resolution);
flush_shift (s, i);
flush_reduce (lookahead_tokens, i);
set_conflicts (states[i], errors);
/* For uniformity of the code, make sure all the states have a valid
- `errs' member. */
+ 'errs' member. */
if (!states[i]->errs)
states[i]->errs = errs_new (0, 0);
}
| Count the number of shift/reduce conflicts. |
`---------------------------------------------*/
-static int
-count_sr_conflicts (state *s)
+static size_t
+count_state_sr_conflicts (state *s)
{
int i;
- int src_count = 0;
transitions *trans = s->transitions;
reductions *reds = s->reductions;
bitset_and (lookahead_set, lookahead_set, shift_set);
- src_count = bitset_count (lookahead_set);
+ return bitset_count (lookahead_set);
+}
+
+/*---------------------------------------------.
+| The total number of shift/reduce conflicts. |
+`---------------------------------------------*/
- return src_count;
+static size_t
+count_sr_conflicts (void)
+{
+ size_t res = 0;
+ state_number i;
+
+ /* Conflicts by state. */
+ for (i = 0; i < nstates; i++)
+ if (conflicts[i])
+ res += count_state_sr_conflicts (states[i]);
+ return res;
}
+
/*----------------------------------------------------------------.
| 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 (state *s, bool one_per_token)
+static size_t
+count_state_rr_conflicts (state *s, bool one_per_token)
{
int i;
reductions *reds = s->reductions;
- int rrc_count = 0;
+ size_t res = 0;
for (i = 0; i < ntokens; i++)
{
int count = 0;
int j;
for (j = 0; j < reds->num; ++j)
- if (bitset_test (reds->lookahead_tokens[j], i))
- count++;
-
+ count += bitset_test (reds->lookahead_tokens[j], i);
if (count >= 2)
- rrc_count += one_per_token ? 1 : count-1;
+ res += one_per_token ? 1 : count-1;
}
- return rrc_count;
+ return res;
}
-
-/*--------------------------------------------------------.
-| Report the number of conflicts, using the Yacc format. |
-`--------------------------------------------------------*/
-
-static void
-conflict_report (FILE *out, int src_num, int rrc_num)
+static size_t
+count_rr_conflicts (bool one_per_token)
{
- 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);
+ size_t res = 0;
+ state_number i;
+
+ /* Conflicts by state. */
+ for (i = 0; i < nstates; i++)
+ if (conflicts[i])
+ res += count_state_rr_conflicts (states[i], one_per_token);
+ return res;
}
state *s = states[i];
if (conflicts[i])
{
+ int src = count_state_sr_conflicts (s);
+ int rrc = count_state_rr_conflicts (s, true);
fprintf (out, _("State %d "), i);
- conflict_report (out, count_sr_conflicts (s),
- count_rr_conflicts (s, true));
+ if (src && rrc)
+ fprintf (out,
+ _("conflicts: %d shift/reduce, %d reduce/reduce\n"),
+ src, rrc);
+ else if (src)
+ fprintf (out, _("conflicts: %d shift/reduce\n"), src);
+ else if (rrc)
+ fprintf (out, _("conflicts: %d reduce/reduce\n"), rrc);
printed_sth = true;
}
}
int
conflicts_total_count (void)
{
- state_number i;
- int count;
-
- /* Conflicts by state. */
- count = 0;
- for (i = 0; i < nstates; i++)
- if (conflicts[i])
- {
- count += count_sr_conflicts (states[i]);
- count += count_rr_conflicts (states[i], false);
- }
- return count;
+ return count_sr_conflicts () + count_rr_conflicts (false);
}
void
conflicts_print (void)
{
- /* 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. */
- {
- state_number i;
-
- for (i = 0; i < nstates; i++)
- if (conflicts[i])
- {
- src_total += count_sr_conflicts (states[i]);
- rrc_total += count_rr_conflicts (states[i], true);
- }
- }
-
- if (! glr_parser && rrc_total > 0 && expected_rr_conflicts != -1)
+ if (! glr_parser && expected_rr_conflicts != -1)
{
- complain (Wother, _("%%expect-rr applies only to GLR parsers"));
+ complain (NULL, Wother, _("%%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;
-
- /* If there are as many RR conflicts and SR conflicts as
- expected, then there is nothing to report. */
- if (rrc_ok & src_ok)
- return;
-
- /* Report the total number of conflicts on STDERR. */
- if (expected_sr_conflicts == -1 && expected_rr_conflicts == -1)
- {
- if (!(warnings_flag & Wconflicts_sr))
- src_total = 0;
- if (!(warnings_flag & Wconflicts_rr))
- rrc_total = 0;
- }
- if (src_total | rrc_total)
- {
- if (expected_sr_conflicts == -1 && expected_rr_conflicts == -1)
- set_warning_issued ();
- if (! yacc_flag)
- fprintf (stderr, "%s: ", current_file);
- conflict_report (stderr, src_total, rrc_total);
- }
+ /* Screams for factoring, but almost useless because of the
+ different strings to translate. */
+ {
+ int total = count_sr_conflicts ();
+ /* If %expect is not used, but %expect-rr is, then expect 0 sr. */
+ int expected =
+ (expected_sr_conflicts == -1 && expected_rr_conflicts != -1)
+ ? 0
+ : expected_sr_conflicts;
+ if (expected != -1)
+ {
+ if (expected != total)
+ complain (NULL, complaint,
+ _("shift/reduce conflicts: %d found, %d expected"),
+ total, expected);
+ }
+ else if (total)
+ complain (NULL, Wconflicts_sr,
+ ngettext ("%d shift/reduce conflict",
+ "%d shift/reduce conflicts",
+ total),
+ total);
+ }
- if (expected_sr_conflicts != -1 || expected_rr_conflicts != -1)
- {
- if (! src_ok)
- complain (complaint, ngettext ("expected %d shift/reduce conflict",
- "expected %d shift/reduce conflicts",
- src_expected),
- src_expected);
- if (! rrc_ok)
- complain (complaint, ngettext ("expected %d reduce/reduce conflict",
- "expected %d reduce/reduce conflicts",
- rrc_expected),
- rrc_expected);
- }
+ {
+ int total = count_rr_conflicts (true);
+ /* If %expect-rr is not used, but %expect is, then expect 0 rr. */
+ int expected =
+ (expected_rr_conflicts == -1 && expected_sr_conflicts != -1)
+ ? 0
+ : expected_rr_conflicts;
+ if (expected != -1)
+ {
+ if (expected != total)
+ complain (NULL, complaint,
+ _("reduce/reduce conflicts: %d found, %d expected"),
+ total, expected);
+ }
+ else if (total)
+ complain (NULL, Wconflicts_rr,
+ ngettext ("%d reduce/reduce conflict",
+ "%d reduce/reduce conflicts",
+ total),
+ total);
+ }
}
projects / bison.git / blobdiff