/* Find and resolve or report look-ahead conflicts for bison,
- Copyright (C) 1984, 1989, 1992, 2000 Free Software Foundation, Inc.
+ Copyright 1984, 1989, 1992, 2000, 2001 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
#include "system.h"
#include "getargs.h"
-#include "alloc.h"
#include "files.h"
#include "gram.h"
#include "state.h"
#include "lalr.h"
+#include "conflicts.h"
+#include "reader.h"
+#include "LR0.h"
-extern char **tags;
-extern int fixed_outfiles;
-
-extern void initialize_conflicts PARAMS ((void));
-extern void conflict_log PARAMS ((void));
-extern void verbose_conflict_log PARAMS ((void));
-extern void print_reductions PARAMS ((int));
-extern void finalize_conflicts PARAMS ((void));
-
-char any_conflicts;
-errs **err_table;
+errs **err_table = NULL;
int expected_conflicts;
-static char *conflicts;
-
+static char *conflicts = NULL;
-static unsigned *shiftset;
-static unsigned *lookaheadset;
-static int src_total;
-static int rrc_total;
-static int src_count;
-static int rrc_count;
+static unsigned *shiftset = NULL;
+static unsigned *lookaheadset = NULL;
\f
static inline void
log_resolution (int state, int LAno, int token, char *resolution)
{
- if (verboseflag)
- fprintf (foutput,
- _("\
+ obstack_fgrow4 (&output_obstack,
+ _("\
Conflict in state %d between rule %d and token %s resolved as %s.\n"),
- state, LAruleno[LAno], tags[token], resolution);
+ state, LAruleno[LAno], tags[token], resolution);
}
unsigned *fp1;
unsigned *fp2;
int redprec;
- errs *errp = (errs *) xmalloc (sizeof (errs) + ntokens * sizeof (short));
+ 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 */
switch (sassoc[i])
{
- case RIGHT_ASSOC:
+ case right_assoc:
log_resolution (state, lookaheadnum, i, _("shift"));
break;
- case LEFT_ASSOC:
+ case left_assoc:
log_resolution (state, lookaheadnum, i, _("reduce"));
break;
- case NON_ASSOC:
+ case non_assoc:
log_resolution (state, lookaheadnum, i, _("an error"));
break;
}
- if (sassoc[i] != RIGHT_ASSOC)
+ if (sassoc[i] != right_assoc)
{
*fp2 &= ~mask; /* flush the shift for this token */
flush_shift (state, i);
}
- if (sassoc[i] != LEFT_ASSOC)
+ if (sassoc[i] != left_assoc)
{
*fp1 &= ~mask; /* flush the reduce for this token */
}
- if (sassoc[i] == NON_ASSOC)
+ if (sassoc[i] == non_assoc)
{
/* Record an explicit error for this token. */
*errtokens++ = i;
/* 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 *) xmalloc ((unsigned int) i);
+ err_table[state] = (errs *) xcalloc ((unsigned int) i, 1);
bcopy (errp, err_table[state], i);
}
else
fp3 = lookaheadset;
while (fp3 < fp4)
- {
- if (*fp2++ & *fp3++)
- {
- conflicts[state] = 1;
- any_conflicts = 1;
- }
- }
+ if (*fp2++ & *fp3++)
+ conflicts[state] = 1;
fp2 = fp1;
fp3 = lookaheadset;
}
void
-initialize_conflicts (void)
+solve_conflicts (void)
{
int i;
-/* errs *sp; JF unused */
- conflicts = NEW2 (nstates, char);
- shiftset = NEW2 (tokensetsize, unsigned);
- lookaheadset = NEW2 (tokensetsize, unsigned);
+ conflicts = XCALLOC (char, nstates);
+ shiftset = XCALLOC (unsigned, tokensetsize);
+ lookaheadset = XCALLOC (unsigned, tokensetsize);
- err_table = NEW2 (nstates, errs *);
-
- any_conflicts = 0;
+ err_table = XCALLOC (errs *, nstates);
for (i = 0; i < nstates; i++)
set_conflicts (i);
}
-
-
-
-
-
-
-
/*---------------------------------------------.
| Count the number of shift/reduce conflicts. |
`---------------------------------------------*/
-static void
+static int
count_sr_conflicts (int state)
{
int i;
unsigned *fp3;
int symbol;
- src_count = 0;
+ int src_count = 0;
shiftp = shift_table[state];
if (!shiftp)
- return;
+ return 0;
for (i = 0; i < tokensetsize; i++)
{
fp2++;
}
}
+
+ return src_count;
}
| Count the number of reduce/reduce conflicts. |
`----------------------------------------------*/
-static void
+static int
count_rr_conflicts (int state)
{
int i;
- int j;
- int count;
unsigned mask;
unsigned *baseword;
- unsigned *wordp;
- int m;
- int n;
- rrc_count = 0;
+ int rrc_count = 0;
- m = lookaheads[state];
- n = lookaheads[state + 1];
+ int m = lookaheads[state];
+ int n = lookaheads[state + 1];
if (n - m < 2)
- return;
+ return 0;
mask = 1;
baseword = LA + m * tokensetsize;
for (i = 0; i < ntokens; i++)
{
- wordp = baseword;
+ unsigned *wordp = baseword;
- count = 0;
+ int count = 0;
+ int j;
for (j = m; j < n; j++)
{
if (mask & *wordp)
baseword++;
}
}
+
+ return rrc_count;
}
-/*------------------------------------.
-| Give a report about the conflicts. |
-`------------------------------------*/
+/*--------------------------------------------------------------.
+| Return a human readable string which reports shift/reduce and |
+| reduce/reduce conflict numbers (SRC_NUM, RRC_NUM). |
+`--------------------------------------------------------------*/
-static void
-total_conflicts (void)
+static const char *
+conflict_report (int src_num, int rrc_num)
{
- if (src_total == expected_conflicts && rrc_total == 0)
- return;
+ static char res[4096];
+ char *cp = res;
- if (fixed_outfiles)
+ if (src_num == 1)
{
- /* If invoked under the name `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);
+ sprintf (cp, _(" 1 shift/reduce conflict"));
+ cp += strlen (cp);
}
- else
+ else if (src_num > 1)
{
- fprintf (stderr, _("%s contains"), infile);
+ sprintf (cp, _(" %d shift/reduce conflicts"), src_num);
+ cp += strlen (cp);
+ }
- if (src_total == 1)
- fprintf (stderr, _(" 1 shift/reduce conflict"));
- else if (src_total > 1)
- fprintf (stderr, _(" %d shift/reduce conflicts"), src_total);
+ if (src_num > 0 && rrc_num > 0)
+ {
+ sprintf (cp, _(" and"));
+ cp += strlen (cp);
+ }
- if (src_total > 0 && rrc_total > 0)
- fprintf (stderr, _(" and"));
+ if (rrc_num == 1)
+ {
+ sprintf (cp, _(" 1 reduce/reduce conflict"));
+ cp += strlen (cp);
+ }
+ else if (rrc_num > 1)
+ {
+ sprintf (cp, _(" %d reduce/reduce conflicts"), rrc_num);
+ cp += strlen (cp);
+ }
- if (rrc_total == 1)
- fprintf (stderr, _(" 1 reduce/reduce conflict"));
- else if (rrc_total > 1)
- fprintf (stderr, _(" %d reduce/reduce conflicts"), rrc_total);
+ *cp++ = '.';
+ *cp++ = '\n';
+ *cp++ = '\0';
- putc ('.', stderr);
- putc ('\n', stderr);
- }
+ return res;
}
-/*---------------------------------------------.
-| Compute and give a report on the conflicts. |
-`---------------------------------------------*/
+/*-----------------------------------------------------------.
+| Output the detailed description of states with conflicts. |
+`-----------------------------------------------------------*/
void
-conflict_log (void)
+conflicts_output (FILE *out)
{
int i;
-
- src_total = 0;
- rrc_total = 0;
-
for (i = 0; i < nstates; i++)
- {
- if (conflicts[i])
- {
- count_sr_conflicts (i);
- count_rr_conflicts (i);
- src_total += src_count;
- rrc_total += rrc_count;
- }
- }
-
- total_conflicts ();
+ if (conflicts[i])
+ {
+ fprintf (out, _("State %d contains"), i);
+ fputs (conflict_report (count_sr_conflicts (i),
+ count_rr_conflicts (i)), out);
+ }
}
+/*------------------------------------------.
+| Reporting the total number of conflicts. |
+`------------------------------------------*/
+
void
-verbose_conflict_log (void)
+conflicts_print (void)
{
int i;
- src_total = 0;
- rrc_total = 0;
+ int src_total = 0;
+ int rrc_total = 0;
+ /* Conflicts by state. */
for (i = 0; i < nstates; i++)
- {
- if (conflicts[i])
- {
- count_sr_conflicts (i);
- count_rr_conflicts (i);
- src_total += src_count;
- rrc_total += rrc_count;
-
- fprintf (foutput, _("State %d contains"), i);
-
- if (src_count == 1)
- fprintf (foutput, _(" 1 shift/reduce conflict"));
- else if (src_count > 1)
- fprintf (foutput, _(" %d shift/reduce conflicts"), src_count);
-
- if (src_count > 0 && rrc_count > 0)
- fprintf (foutput, _(" and"));
-
- if (rrc_count == 1)
- fprintf (foutput, _(" 1 reduce/reduce conflict"));
- else if (rrc_count > 1)
- fprintf (foutput, _(" %d reduce/reduce conflicts"), rrc_count);
-
- putc ('.', foutput);
- putc ('\n', foutput);
- }
- }
+ if (conflicts[i])
+ {
+ src_total += count_sr_conflicts (i);
+ rrc_total += count_rr_conflicts (i);
+ }
- total_conflicts ();
+ /* Report the total number of conflicts on STDERR. */
+ if (src_total || rrc_total)
+ if (yacc_flag)
+ {
+ /* 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);
+ }
+ else
+ {
+ fprintf (stderr, _("%s contains"), infile);
+ fputs (conflict_report (src_total, rrc_total), stderr);
+ }
}
-
-
-
-
void
print_reductions (int state)
{
for (i = 0; i < ntokens; i++)
{
if (mask & *fp3)
- fprintf (foutput, _(" %-4s\t[reduce using rule %d (%s)]\n"),
- tags[i], default_rule, tags[rlhs[default_rule]]);
+ obstack_fgrow3 (&output_obstack,
+ _(" %-4s\t[reduce using rule %d (%s)]\n"),
+ tags[i], default_rule, tags[rlhs[default_rule]]);
mask <<= 1;
if (mask == 0)
}
}
- fprintf (foutput, _(" $default\treduce using rule %d (%s)\n\n"),
- default_rule, tags[rlhs[default_rule]]);
+ obstack_fgrow2 (&output_obstack,
+ _(" $default\treduce using rule %d (%s)\n\n"),
+ default_rule, tags[rlhs[default_rule]]);
}
else if (n - m >= 1)
{
if (j != default_LA)
{
rule = LAruleno[j];
- fprintf (foutput,
+ obstack_fgrow3 (&output_obstack,
_(" %-4s\treduce using rule %d (%s)\n"),
tags[i], rule, tags[rlhs[rule]]);
}
if (defaulted)
{
rule = LAruleno[default_LA];
- fprintf (foutput,
+ obstack_fgrow3 (&output_obstack,
_(" %-4s\treduce using rule %d (%s)\n"),
tags[i], rule, tags[rlhs[rule]]);
defaulted = 0;
}
rule = LAruleno[j];
- fprintf (foutput,
+ obstack_fgrow3 (&output_obstack,
_(" %-4s\t[reduce using rule %d (%s)]\n"),
tags[i], rule, tags[rlhs[rule]]);
}
}
if (default_LA >= 0)
- {
- fprintf (foutput, _(" $default\treduce using rule %d (%s)\n"),
- default_rule, tags[rlhs[default_rule]]);
- }
+ obstack_fgrow2 (&output_obstack,
+ _(" $default\treduce using rule %d (%s)\n"),
+ default_rule, tags[rlhs[default_rule]]);
- putc ('\n', foutput);
+ obstack_1grow (&output_obstack, '\n');
}
}
void
-finalize_conflicts (void)
+free_conflicts (void)
{
- FREE (conflicts);
- FREE (shiftset);
- FREE (lookaheadset);
+ XFREE (conflicts);
+ XFREE (shiftset);
+ XFREE (lookaheadset);
}
projects / bison.git / blobdiff