/* Find and resolve or report look-ahead conflicts for bison,
- Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002
+ Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002, 2003, 2004
Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
#include "symtab.h"
/* -1 stands for not specified. */
-int expected_conflicts = -1;
+int expected_sr_conflicts = -1;
+int expected_rr_conflicts = -1;
static char *conflicts = NULL;
struct obstack solved_conflicts_obstack;
}
}
- /* 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 (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))
{
for (i = 0; i < reds->num; ++i)
if (reds->rules[i]->prec && reds->rules[i]->prec->prec
&& !bitset_disjoint_p (reds->lookaheads[i], lookaheadset))
- {
- resolve_sr_conflict (s, i, errors);
- break;
- }
+ resolve_sr_conflict (s, i, errors);
/* Loop over all rules which require lookahead in this state. Check
for conflicts not resolved above. */
+`----------------------------------------------------------------*/
static int
-count_rr_conflicts (state *s, int one_per_token)
+count_rr_conflicts (state *s, bool one_per_token)
{
int i;
reductions *reds = s->reductions;
}
-/*--------------------------------------------------------------.
-| 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;
-
- 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++ = '\0';
-
- return res;
-}
-
-
-/*----------------------------------------------------------------.
-| Same as above, but report the number of conflicts a` la POSIX. |
-`----------------------------------------------------------------*/
+/*--------------------------------------------------------.
+| Report the number of conflicts, using the Yacc format. |
+`--------------------------------------------------------*/
static void
-conflict_report_yacc (int src_num, int rrc_num)
+conflict_report (FILE *out, int src_num, int rrc_num)
{
- /* If invoked with `--yacc', use the output format specified by
- POSIX. */
- fprintf (stderr, _("conflicts: "));
- if (src_num > 0)
- fprintf (stderr, _(" %d shift/reduce"), src_num);
- if (src_num > 0 && rrc_num > 0)
- fprintf (stderr, ",");
- if (rrc_num > 0)
- fprintf (stderr, _(" %d reduce/reduce"), rrc_num);
- putc ('\n', stderr);
+ 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);
}
state *s = states[i];
if (conflicts[i])
{
- fprintf (out, _("State %d contains "), i);
- fprintf (out, "%s.\n",
- conflict_report (count_sr_conflicts (s),
- count_rr_conflicts (s, true)));
+ fprintf (out, _("State %d "), i);
+ conflict_report (out, count_sr_conflicts (s),
+ count_rr_conflicts (s, true));
printed_sth = true;
}
}
/* 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. */
- int src_ok = 0;
+ bool src_ok = false;
+ bool rrc_ok = false;
int src_total = 0;
int rrc_total = 0;
}
}
- src_ok = src_total == (expected_conflicts == -1 ? 0 : expected_conflicts);
+ if (! glr_parser && rrc_total > 0 && expected_rr_conflicts != -1)
+ {
+ warn (_("%%expect-rr applies only to GLR parsers"));
+ expected_rr_conflicts = -1;
+ }
- /* If there are no RR conflicts, and as many SR conflicts as
+ src_ok =
+ src_total == (expected_sr_conflicts == -1 ? 0 : expected_sr_conflicts);
+ rrc_ok =
+ rrc_total == (expected_rr_conflicts == -1 ? 0 : expected_rr_conflicts);
+
+ /* If there are as many RR conflicts and SR conflicts as
expected, then there is nothing to report. */
- if (!rrc_total && src_ok)
+ if (rrc_ok && src_ok)
return;
/* Report the total number of conflicts on STDERR. */
- if (yacc_flag)
- conflict_report_yacc (src_total, rrc_total);
- else
- warn ("%s", conflict_report (src_total, rrc_total));
+ if (! yacc_flag)
+ fprintf (stderr, "%s: ", current_file);
+ conflict_report (stderr, src_total, rrc_total);
- if (expected_conflicts != -1 && !src_ok)
- complain (ngettext ("expected %d shift/reduce conflict",
+ if (expected_sr_conflicts != -1 || expected_rr_conflicts != -1)
+ {
+ int sr = expected_sr_conflicts == -1 ? 0 : expected_sr_conflicts;
+ int rr = expected_rr_conflicts == -1 ? 0 : expected_rr_conflicts;
+ if (! src_ok)
+ warn (ngettext ("expected %d shift/reduce conflict",
"expected %d shift/reduce conflicts",
- expected_conflicts),
- expected_conflicts);
+ sr), sr);
+ if (! rrc_ok)
+ warn (ngettext ("expected %d reduce/reduce conflict",
+ "expected %d reduce/reduce conflicts",
+ rr), rr);
+ }
}
void
conflicts_free (void)
{
- free (conflicts);
+ XFREE (conflicts);
bitset_free (shiftset);
bitset_free (lookaheadset);
obstack_free (&solved_conflicts_obstack, NULL);
projects / bison.git / blobdiff