{
int i, j;
shifts *shiftp;
- int symbol;
if (state_table[state].consistent)
return;
shiftp = state_table[state].shift_table;
if (shiftp)
- for (i = 0; i < shiftp->nshifts; i++)
- {
- symbol = state_table[shiftp->shifts[i]].accessing_symbol;
- if (ISVAR (symbol))
- break;
- SETBIT (lookaheadset, symbol);
- }
+ for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
+ SETBIT (lookaheadset, SHIFT_SYMBOL (shiftp, i));
/* Loop over all rules which require lookahead in this state. First
check for shift-reduce conflict, and try to resolve using
static int
count_sr_conflicts (int state)
{
- int i;
- int k;
- int mask;
- shifts *shiftp;
- unsigned *fp1;
- unsigned *fp2;
- unsigned *fp3;
- int symbol;
-
+ int i, k;
int src_count = 0;
+ shifts *shiftp = state_table[state].shift_table;
- shiftp = state_table[state].shift_table;
if (!shiftp)
return 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);
- fp2 = lookaheadset;
-
- while (fp2 < fp3)
- *fp2++ |= *fp1++;
- }
+ for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
+ SETBIT (shiftset, SHIFT_SYMBOL (shiftp, i));
- fp1 = shiftset;
- fp2 = lookaheadset;
+ for (i = state_table[state].lookaheads;
+ i < state_table[state + 1].lookaheads;
+ ++i)
+ for (k = 0; k < tokensetsize; ++k)
+ lookaheadset[k] |= LA (i)[k];
- while (fp2 < fp3)
- *fp2++ &= *fp1++;
+ for (k = 0; k < tokensetsize; ++k)
+ lookaheadset[k] &= shiftset[k];
- mask = 1;
- fp2 = lookaheadset;
for (i = 0; i < ntokens; i++)
- {
- if (mask & *fp2)
- src_count++;
-
- mask <<= 1;
- if (mask == 0)
- {
- mask = 1;
- fp2++;
- }
- }
+ if (BITISSET (lookaheadset, i))
+ src_count++;
return src_count;
}
count_rr_conflicts (int state)
{
int i;
- unsigned mask;
- unsigned *baseword;
-
int rrc_count = 0;
int m = state_table[state].lookaheads;
if (n - m < 2)
return 0;
- mask = 1;
- baseword = LA (m);
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;
- }
+ if (BITISSET (LA (m), j))
+ count++;
if (count >= 2)
rrc_count++;
-
- mask <<= 1;
- if (mask == 0)
- {
- mask = 1;
- baseword++;
- }
}
return rrc_count;
{
int i;
int j;
- 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;
shiftp = state_table[state].shift_table;
if (shiftp)
- for (i = 0; i < shiftp->nshifts; i++)
+ for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); 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)
+ /* if this state has a shift for the error token, don't use a
+ default rule. */
+ if (SHIFT_IS_ERROR (shiftp, i))
nodefault = 1;
- SETBIT (shiftset, symbol);
+ SETBIT (shiftset, SHIFT_SYMBOL (shiftp, i));
}
errp = err_table[state];
if (errp)
- {
- for (i = 0; i < errp->nerrs; i++)
- {
- if (!errp->errs[i])
- continue;
- symbol = errp->errs[i];
- SETBIT (shiftset, symbol);
- }
- }
+ for (i = 0; i < errp->nerrs; i++)
+ if (errp->errs[i])
+ SETBIT (shiftset, errp->errs[i]);
m = state_table[state].lookaheads;
n = state_table[state + 1].lookaheads;
if (n - m == 1 && !nodefault)
{
int k;
- default_rule = LAruleno[m];
+ int default_rule = LAruleno[m];
for (k = 0; k < tokensetsize; ++k)
lookaheadset[k] = LA (m)[k] & shiftset[k];
}
else if (n - m >= 1)
{
- unsigned *fp1, *fp2, *fp3, *fp4;
+ int k;
- cmax = 0;
- default_LA = -1;
- fp4 = lookaheadset + tokensetsize;
+ int cmax = 0;
+ int default_LA = -1;
+ int default_rule = 0;
if (!nodefault)
for (i = m; i < n; i++)
{
- fp1 = LA (i);
- fp2 = shiftset;
- fp3 = lookaheadset;
+ int count = 0;
- while (fp3 < fp4)
- *fp3++ = *fp1++ & (~(*fp2++));
+ for (k = 0; k < tokensetsize; ++k)
+ lookaheadset[k] = LA (i)[k] & ~shiftset[k];
- 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 (BITISSET (lookaheadset, j))
+ count++;
if (count > cmax)
{
default_rule = LAruleno[i];
}
- fp2 = shiftset;
- fp3 = lookaheadset;
-
- while (fp3 < fp4)
- *fp2++ |= *fp3++;
+ for (k = 0; k < tokensetsize; ++k)
+ shiftset[k] |= lookaheadset[k];
}
for (i = 0; i < tokensetsize; i++)
shiftset[i] = 0;
if (shiftp)
- {
- for (i = 0; i < shiftp->nshifts; i++)
- {
- if (!shiftp->shifts[i])
- continue;
- symbol = state_table[shiftp->shifts[i]].accessing_symbol;
- if (ISVAR (symbol))
- break;
- SETBIT (shiftset, symbol);
- }
- }
+ for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
+ SETBIT (shiftset, SHIFT_SYMBOL (shiftp, i));
- mask = 1;
- fp1 = LA (m);
- fp2 = shiftset;
for (i = 0; i < ntokens; i++)
{
int defaulted = 0;
+ int count = BITISSET (shiftset, i);
- if (mask & *fp2)
- count = 1;
- else
- count = 0;
-
- fp3 = fp1;
for (j = m; j < n; j++)
{
- if (mask & *fp3)
+ if (BITISSET (LA (m), j))
{
if (count == 0)
{
if (j != default_LA)
- {
- rule = LAruleno[j];
- fprintf (out,
- _(" %-4s\treduce using rule %d (%s)\n"),
- tags[i], rule, tags[rule_table[rule].lhs]);
- }
+ fprintf (out,
+ _(" %-4s\treduce using rule %d (%s)\n"),
+ tags[i],
+ LAruleno[j],
+ tags[rule_table[LAruleno[j]].lhs]);
else
defaulted = 1;
else
{
if (defaulted)
- {
- rule = LAruleno[default_LA];
- fprintf (out,
- _(" %-4s\treduce using rule %d (%s)\n"),
- tags[i], rule, tags[rule_table[rule].lhs]);
- defaulted = 0;
- }
- rule = LAruleno[j];
+ fprintf (out,
+ _(" %-4s\treduce using rule %d (%s)\n"),
+ tags[i],
+ LAruleno[default_LA],
+ tags[rule_table[LAruleno[default_LA]].lhs]);
+ defaulted = 0;
fprintf (out,
_(" %-4s\t[reduce using rule %d (%s)]\n"),
- tags[i], rule, tags[rule_table[rule].lhs]);
+ tags[i],
+ LAruleno[j],
+ tags[rule_table[LAruleno[j]].lhs]);
}
}
-
- 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++;
}
}
projects / bison.git / blobdiff