mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
311 lines
6.1 KiB
C
311 lines
6.1 KiB
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[] = "@(#)closure.c 5.3 (Berkeley) 5/24/93";
|
|
#endif
|
|
#endif
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <stdlib.h>
|
|
#include "defs.h"
|
|
|
|
short *itemset;
|
|
short *itemsetend;
|
|
unsigned *ruleset;
|
|
|
|
static void set_EFF(void);
|
|
#ifdef DEBUG
|
|
static void print_closure(int);
|
|
static void print_EFF();
|
|
static void print_first_derives();
|
|
#endif
|
|
|
|
static unsigned *first_derives;
|
|
static unsigned *EFF;
|
|
|
|
|
|
static void
|
|
set_EFF(void)
|
|
{
|
|
unsigned *row;
|
|
int symbol;
|
|
short *sp;
|
|
int rowsize;
|
|
int i;
|
|
int rule;
|
|
|
|
rowsize = WORDSIZE(nvars);
|
|
EFF = NEW2(nvars * rowsize, unsigned);
|
|
|
|
row = EFF;
|
|
for (i = start_symbol; i < nsyms; i++)
|
|
{
|
|
sp = derives[i];
|
|
for (rule = *sp; rule > 0; rule = *++sp)
|
|
{
|
|
symbol = ritem[rrhs[rule]];
|
|
if (ISVAR(symbol))
|
|
{
|
|
symbol -= start_symbol;
|
|
SETBIT(row, symbol);
|
|
}
|
|
}
|
|
row += rowsize;
|
|
}
|
|
|
|
reflexive_transitive_closure(EFF, nvars);
|
|
|
|
#ifdef DEBUG
|
|
print_EFF();
|
|
#endif
|
|
}
|
|
|
|
|
|
void
|
|
set_first_derives(void)
|
|
{
|
|
unsigned *rrow;
|
|
unsigned *vrow;
|
|
int j;
|
|
unsigned k;
|
|
unsigned cword = 0;
|
|
short *rp;
|
|
|
|
int rule;
|
|
int i;
|
|
int rulesetsize;
|
|
int varsetsize;
|
|
|
|
rulesetsize = WORDSIZE(nrules);
|
|
varsetsize = WORDSIZE(nvars);
|
|
first_derives = NEW2(nvars * rulesetsize, unsigned) - ntokens * rulesetsize;
|
|
|
|
set_EFF();
|
|
|
|
rrow = first_derives + ntokens * rulesetsize;
|
|
for (i = start_symbol; i < nsyms; i++)
|
|
{
|
|
vrow = EFF + ((i - ntokens) * varsetsize);
|
|
k = BITS_PER_WORD;
|
|
for (j = start_symbol; j < nsyms; k++, j++)
|
|
{
|
|
if (k >= BITS_PER_WORD)
|
|
{
|
|
cword = *vrow++;
|
|
k = 0;
|
|
}
|
|
|
|
if (cword & (1 << k))
|
|
{
|
|
rp = derives[j];
|
|
while ((rule = *rp++) >= 0)
|
|
{
|
|
SETBIT(rrow, rule);
|
|
}
|
|
}
|
|
}
|
|
|
|
rrow += rulesetsize;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
print_first_derives();
|
|
#endif
|
|
|
|
free(EFF);
|
|
}
|
|
|
|
|
|
void
|
|
closure(short *nucleus, int n)
|
|
{
|
|
int ruleno;
|
|
unsigned word;
|
|
unsigned i;
|
|
short *csp;
|
|
unsigned *dsp;
|
|
unsigned *rsp;
|
|
int rulesetsize;
|
|
|
|
short *csend;
|
|
unsigned *rsend;
|
|
int symbol;
|
|
int itemno;
|
|
|
|
rulesetsize = WORDSIZE(nrules);
|
|
rsend = ruleset + rulesetsize;
|
|
for (rsp = ruleset; rsp < rsend; rsp++)
|
|
*rsp = 0;
|
|
|
|
csend = nucleus + n;
|
|
for (csp = nucleus; csp < csend; ++csp)
|
|
{
|
|
symbol = ritem[*csp];
|
|
if (ISVAR(symbol))
|
|
{
|
|
dsp = first_derives + symbol * rulesetsize;
|
|
rsp = ruleset;
|
|
while (rsp < rsend)
|
|
*rsp++ |= *dsp++;
|
|
}
|
|
}
|
|
|
|
ruleno = 0;
|
|
itemsetend = itemset;
|
|
csp = nucleus;
|
|
for (rsp = ruleset; rsp < rsend; ++rsp)
|
|
{
|
|
word = *rsp;
|
|
if (word)
|
|
{
|
|
for (i = 0; i < BITS_PER_WORD; ++i)
|
|
{
|
|
if (word & (1 << i))
|
|
{
|
|
itemno = rrhs[ruleno+i];
|
|
while (csp < csend && *csp < itemno)
|
|
*itemsetend++ = *csp++;
|
|
*itemsetend++ = itemno;
|
|
while (csp < csend && *csp == itemno)
|
|
++csp;
|
|
}
|
|
}
|
|
}
|
|
ruleno += BITS_PER_WORD;
|
|
}
|
|
|
|
while (csp < csend)
|
|
*itemsetend++ = *csp++;
|
|
|
|
#ifdef DEBUG
|
|
print_closure(n);
|
|
#endif
|
|
}
|
|
|
|
|
|
|
|
void
|
|
finalize_closure(void)
|
|
{
|
|
free(itemset);
|
|
free(ruleset);
|
|
free(first_derives + ntokens * WORDSIZE(nrules));
|
|
}
|
|
|
|
|
|
#ifdef DEBUG
|
|
|
|
static void
|
|
print_closure(int n)
|
|
{
|
|
short *isp;
|
|
|
|
printf("\n\nn = %d\n\n", n);
|
|
for (isp = itemset; isp < itemsetend; isp++)
|
|
printf(" %d\n", *isp);
|
|
}
|
|
|
|
|
|
static void
|
|
print_EFF(void)
|
|
{
|
|
int i, j;
|
|
unsigned *rowp;
|
|
unsigned word;
|
|
unsigned k;
|
|
|
|
printf("\n\nEpsilon Free Firsts\n");
|
|
|
|
for (i = start_symbol; i < nsyms; i++)
|
|
{
|
|
printf("\n%s", symbol_name[i]);
|
|
rowp = EFF + ((i - start_symbol) * WORDSIZE(nvars));
|
|
word = *rowp++;
|
|
|
|
k = BITS_PER_WORD;
|
|
for (j = 0; j < nvars; k++, j++)
|
|
{
|
|
if (k >= BITS_PER_WORD)
|
|
{
|
|
word = *rowp++;
|
|
k = 0;
|
|
}
|
|
|
|
if (word & (1 << k))
|
|
printf(" %s", symbol_name[start_symbol + j]);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
print_first_derives(void)
|
|
{
|
|
int i;
|
|
int j;
|
|
unsigned *rp;
|
|
unsigned cword;
|
|
unsigned k;
|
|
|
|
printf("\n\n\nFirst Derives\n");
|
|
|
|
for (i = start_symbol; i < nsyms; i++)
|
|
{
|
|
printf("\n%s derives\n", symbol_name[i]);
|
|
rp = first_derives + i * WORDSIZE(nrules);
|
|
k = BITS_PER_WORD;
|
|
for (j = 0; j <= nrules; k++, j++)
|
|
{
|
|
if (k >= BITS_PER_WORD)
|
|
{
|
|
cword = *rp++;
|
|
k = 0;
|
|
}
|
|
|
|
if (cword & (1 << k))
|
|
printf(" %d\n", j);
|
|
}
|
|
}
|
|
|
|
fflush(stdout);
|
|
}
|
|
|
|
#endif
|