2 * Copyright (c) 1989 The Regents of the University of California.
5 * This code is derived from software contributed to Berkeley by
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35 static char sccsid[] = "@(#)closure.c 5.3 (Berkeley) 5/24/93";
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
49 static void set_EFF(void);
51 static void print_closure(int);
52 static void print_EFF();
53 static void print_first_derives();
56 static unsigned *first_derives;
70 rowsize = WORDSIZE(nvars);
71 EFF = NEW2(nvars * rowsize, unsigned);
74 for (i = start_symbol; i < nsyms; i++)
77 for (rule = *sp; rule > 0; rule = *++sp)
79 symbol = ritem[rrhs[rule]];
82 symbol -= start_symbol;
89 reflexive_transitive_closure(EFF, nvars);
98 set_first_derives(void)
112 rulesetsize = WORDSIZE(nrules);
113 varsetsize = WORDSIZE(nvars);
114 first_derives = NEW2(nvars * rulesetsize, unsigned) - ntokens * rulesetsize;
118 rrow = first_derives + ntokens * rulesetsize;
119 for (i = start_symbol; i < nsyms; i++)
121 vrow = EFF + ((i - ntokens) * varsetsize);
123 for (j = start_symbol; j < nsyms; k++, j++)
125 if (k >= BITS_PER_WORD)
131 if (cword & (1 << k))
134 while ((rule = *rp++) >= 0)
145 print_first_derives();
153 closure(short *nucleus, int n)
168 rulesetsize = WORDSIZE(nrules);
169 rsend = ruleset + rulesetsize;
170 for (rsp = ruleset; rsp < rsend; rsp++)
174 for (csp = nucleus; csp < csend; ++csp)
176 symbol = ritem[*csp];
179 dsp = first_derives + symbol * rulesetsize;
187 itemsetend = itemset;
189 for (rsp = ruleset; rsp < rsend; ++rsp)
194 for (i = 0; i < BITS_PER_WORD; ++i)
198 itemno = rrhs[ruleno+i];
199 while (csp < csend && *csp < itemno)
200 *itemsetend++ = *csp++;
201 *itemsetend++ = itemno;
202 while (csp < csend && *csp == itemno)
207 ruleno += BITS_PER_WORD;
211 *itemsetend++ = *csp++;
221 finalize_closure(void)
225 free(first_derives + ntokens * WORDSIZE(nrules));
236 printf("\n\nn = %d\n\n", n);
237 for (isp = itemset; isp < itemsetend; isp++)
238 printf(" %d\n", *isp);
250 printf("\n\nEpsilon Free Firsts\n");
252 for (i = start_symbol; i < nsyms; i++)
254 printf("\n%s", symbol_name[i]);
255 rowp = EFF + ((i - start_symbol) * WORDSIZE(nvars));
259 for (j = 0; j < nvars; k++, j++)
261 if (k >= BITS_PER_WORD)
268 printf(" %s", symbol_name[start_symbol + j]);
275 print_first_derives(void)
283 printf("\n\n\nFirst Derives\n");
285 for (i = start_symbol; i < nsyms; i++)
287 printf("\n%s derives\n", symbol_name[i]);
288 rp = first_derives + i * WORDSIZE(nrules);
290 for (j = 0; j <= nrules; k++, j++)
292 if (k >= BITS_PER_WORD)
298 if (cword & (1 << k))