FreeBSD-5.3/usr.bin/yacc/verbose.c
/*
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Robert Paul Corbett.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if 0
#ifndef lint
static char sccsid[] = "@(#)verbose.c 5.3 (Berkeley) 1/20/91";
#endif
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.bin/yacc/verbose.c,v 1.13 2002/04/09 11:39:05 ru Exp $");
#include <stdlib.h>
#include "defs.h"
static short *null_rules;
static void log_unused(void);
static void log_conflicts(void);
static void print_actions(int);
static void print_conflicts(int);
static void print_core(int);
static void print_gotos(int);
static void print_nulls(int);
static void print_reductions(action *, register int);
static void print_shifts(action *);
static void print_state(int);
void
verbose()
{
int i;
if (!vflag) return;
null_rules = (short *) MALLOC(nrules*sizeof(short));
if (null_rules == 0) no_space();
fprintf(verbose_file, "\f\n");
for (i = 0; i < nstates; i++)
print_state(i);
FREE(null_rules);
if (nunused)
log_unused();
if (SRtotal || RRtotal)
log_conflicts();
fprintf(verbose_file, "\n\n%d terminals, %d nonterminals\n", ntokens,
nvars);
fprintf(verbose_file, "%d grammar rules, %d states\n", nrules - 2, nstates);
}
static void
log_unused()
{
int i;
short *p;
fprintf(verbose_file, "\n\nRules never reduced:\n");
for (i = 3; i < nrules; ++i)
{
if (!rules_used[i])
{
fprintf(verbose_file, "\t%s :", symbol_name[rlhs[i]]);
for (p = ritem + rrhs[i]; *p >= 0; ++p)
fprintf(verbose_file, " %s", symbol_name[*p]);
fprintf(verbose_file, " (%d)\n", i - 2);
}
}
}
static void
log_conflicts()
{
int i;
fprintf(verbose_file, "\n\n");
for (i = 0; i < nstates; i++)
{
if (SRconflicts[i] || RRconflicts[i])
{
fprintf(verbose_file, "State %d contains ", i);
if (SRconflicts[i] == 1)
fprintf(verbose_file, "1 shift/reduce conflict");
else if (SRconflicts[i] > 1)
fprintf(verbose_file, "%d shift/reduce conflicts",
SRconflicts[i]);
if (SRconflicts[i] && RRconflicts[i])
fprintf(verbose_file, ", ");
if (RRconflicts[i] == 1)
fprintf(verbose_file, "1 reduce/reduce conflict");
else if (RRconflicts[i] > 1)
fprintf(verbose_file, "%d reduce/reduce conflicts",
RRconflicts[i]);
fprintf(verbose_file, ".\n");
}
}
}
static void
print_state(state)
int state;
{
if (state)
fprintf(verbose_file, "\n\n");
if (SRconflicts[state] || RRconflicts[state])
print_conflicts(state);
fprintf(verbose_file, "state %d\n", state);
print_core(state);
print_nulls(state);
print_actions(state);
}
static void
print_conflicts(state)
int state;
{
int symbol, act = 0, number = 0;
action *p;
symbol = -1;
for (p = parser[state]; p; p = p->next)
{
if (p->suppressed == 2)
continue;
if (p->symbol != symbol)
{
symbol = p->symbol;
number = p->number;
if (p->action_code == SHIFT)
act = SHIFT;
else
act = REDUCE;
}
else if (p->suppressed == 1)
{
if (state == final_state && symbol == 0)
{
fprintf(verbose_file, "%d: shift/reduce conflict \
(accept, reduce %d) on $end\n", state, p->number - 2);
}
else
{
if (act == SHIFT)
{
fprintf(verbose_file, "%d: shift/reduce conflict \
(shift %d, reduce %d) on %s\n", state, number, p->number - 2,
symbol_name[symbol]);
}
else
{
fprintf(verbose_file, "%d: reduce/reduce conflict \
(reduce %d, reduce %d) on %s\n", state, number - 2, p->number - 2,
symbol_name[symbol]);
}
}
}
}
}
static void
print_core(state)
int state;
{
int i;
int k;
int rule;
core *statep;
short *sp;
short *sp1;
statep = state_table[state];
k = statep->nitems;
for (i = 0; i < k; i++)
{
sp1 = sp = ritem + statep->items[i];
while (*sp >= 0) ++sp;
rule = -(*sp);
fprintf(verbose_file, "\t%s : ", symbol_name[rlhs[rule]]);
for (sp = ritem + rrhs[rule]; sp < sp1; sp++)
fprintf(verbose_file, "%s ", symbol_name[*sp]);
putc('.', verbose_file);
while (*sp >= 0)
{
fprintf(verbose_file, " %s", symbol_name[*sp]);
sp++;
}
fprintf(verbose_file, " (%d)\n", -2 - *sp);
}
}
static void
print_nulls(state)
int state;
{
action *p;
int i, j, k, nnulls;
nnulls = 0;
for (p = parser[state]; p; p = p->next)
{
if (p->action_code == REDUCE &&
(p->suppressed == 0 || p->suppressed == 1))
{
i = p->number;
if (rrhs[i] + 1 == rrhs[i+1])
{
for (j = 0; j < nnulls && i > null_rules[j]; ++j)
continue;
if (j == nnulls)
{
++nnulls;
null_rules[j] = i;
}
else if (i != null_rules[j])
{
++nnulls;
for (k = nnulls - 1; k > j; --k)
null_rules[k] = null_rules[k-1];
null_rules[j] = i;
}
}
}
}
for (i = 0; i < nnulls; ++i)
{
j = null_rules[i];
fprintf(verbose_file, "\t%s : . (%d)\n", symbol_name[rlhs[j]],
j - 2);
}
fprintf(verbose_file, "\n");
}
static void
print_actions(stateno)
int stateno;
{
action *p;
shifts *sp;
int as;
if (stateno == final_state)
fprintf(verbose_file, "\t$end accept\n");
p = parser[stateno];
if (p)
{
print_shifts(p);
print_reductions(p, defred[stateno]);
}
sp = shift_table[stateno];
if (sp && sp->nshifts > 0)
{
as = accessing_symbol[sp->shift[sp->nshifts - 1]];
if (ISVAR(as))
print_gotos(stateno);
}
}
static void
print_shifts(p)
action *p;
{
int count;
action *q;
count = 0;
for (q = p; q; q = q->next)
{
if (q->suppressed < 2 && q->action_code == SHIFT)
++count;
}
if (count > 0)
{
for (; p; p = p->next)
{
if (p->action_code == SHIFT && p->suppressed == 0)
fprintf(verbose_file, "\t%s shift %d\n",
symbol_name[p->symbol], p->number);
}
}
}
static void
print_reductions(p, defreduct)
action *p;
int defreduct;
{
int k, anyreds;
action *q;
anyreds = 0;
for (q = p; q ; q = q->next)
{
if (q->action_code == REDUCE && q->suppressed < 2)
{
anyreds = 1;
break;
}
}
if (anyreds == 0)
fprintf(verbose_file, "\t. error\n");
else
{
for (; p; p = p->next)
{
if (p->action_code == REDUCE && p->number != defreduct)
{
k = p->number - 2;
if (p->suppressed == 0)
fprintf(verbose_file, "\t%s reduce %d\n",
symbol_name[p->symbol], k);
}
}
if (defreduct > 0)
fprintf(verbose_file, "\t. reduce %d\n", defreduct - 2);
}
}
static void
print_gotos(stateno)
int stateno;
{
int i, k;
int as;
short *tostate;
shifts *sp;
putc('\n', verbose_file);
sp = shift_table[stateno];
tostate = sp->shift;
for (i = 0; i < sp->nshifts; ++i)
{
k = tostate[i];
as = accessing_symbol[k];
if (ISVAR(as))
fprintf(verbose_file, "\t%s goto %d\n", symbol_name[as], k);
}
}