1 /* $Id: closure.c,v 1.7 2009/10/27 09:30:14 tom Exp $ */
9 static unsigned *first_derives;
22 rowsize = WORDSIZE(nvars);
23 EFF = NEW2(nvars * rowsize, unsigned);
26 for (i = start_symbol; i < nsyms; i++)
29 for (rule = *sp; rule > 0; rule = *++sp)
31 symbol = ritem[rrhs[rule]];
34 symbol -= start_symbol;
41 reflexive_transitive_closure(EFF, nvars);
49 set_first_derives(void)
63 rulesetsize = WORDSIZE(nrules);
64 varsetsize = WORDSIZE(nvars);
65 first_derives = NEW2(nvars * rulesetsize, unsigned) - ntokens * rulesetsize;
69 rrow = first_derives + ntokens * rulesetsize;
70 for (i = start_symbol; i < nsyms; i++)
72 vrow = EFF + ((i - ntokens) * varsetsize);
74 for (j = start_symbol; j < nsyms; k++, j++)
76 if (k >= BITS_PER_WORD)
85 while ((rule = *rp++) >= 0)
97 print_first_derives();
104 closure(short *nucleus, int n)
119 rulesetsize = WORDSIZE(nrules);
121 rsend = ruleset + rulesetsize;
122 for (rsp = ruleset; rsp < rsend; rsp++)
126 for (csp = nucleus; csp < csend; ++csp)
128 symbol = ritem[*csp];
131 dsp = first_derives + symbol * rulesetsize;
139 itemsetend = itemset;
141 for (rsp = ruleset; rsp < rsend; ++rsp)
146 for (i = 0; i < BITS_PER_WORD; ++i)
150 itemno = rrhs[ruleno + i];
151 while (csp < csend && *csp < itemno)
152 *itemsetend++ = *csp++;
153 *itemsetend++ = itemno;
154 while (csp < csend && *csp == itemno)
159 ruleno += BITS_PER_WORD;
163 *itemsetend++ = *csp++;
171 finalize_closure(void)
175 FREE(first_derives + ntokens * WORDSIZE(nrules));
185 printf("\n\nn = %d\n\n", n);
186 for (isp = itemset; isp < itemsetend; isp++)
187 printf(" %d\n", *isp);
198 printf("\n\nEpsilon Free Firsts\n");
200 for (i = start_symbol; i < nsyms; i++)
202 printf("\n%s", symbol_name[i]);
203 rowp = EFF + ((i - start_symbol) * WORDSIZE(nvars));
207 for (j = 0; j < nvars; k++, j++)
209 if (k >= BITS_PER_WORD)
216 printf(" %s", symbol_name[start_symbol + j]);
222 print_first_derives(void)
230 printf("\n\n\nFirst Derives\n");
232 for (i = start_symbol; i < nsyms; i++)
234 printf("\n%s derives\n", symbol_name[i]);
235 rp = first_derives + i * WORDSIZE(nrules);
237 for (j = 0; j <= nrules; k++, j++)
239 if (k >= BITS_PER_WORD)
245 if (cword & (1 << k))