1 /* $Id: closure.c,v 1.11 2014/09/18 00:40:07 tom Exp $ */
9 static unsigned *first_base;
10 static unsigned *first_derives;
14 static void print_closure(int);
15 static void print_EFF(void);
16 static void print_first_derives(void);
29 rowsize = WORDSIZE(nvars);
30 EFF = NEW2(nvars * rowsize, unsigned);
33 for (i = start_symbol; i < nsyms; i++)
36 for (rule = *sp; rule > 0; rule = *++sp)
38 symbol = ritem[rrhs[rule]];
41 symbol -= start_symbol;
48 reflexive_transitive_closure(EFF, nvars);
56 set_first_derives(void)
70 rulesetsize = WORDSIZE(nrules);
71 varsetsize = WORDSIZE(nvars);
72 first_base = NEW2(nvars * rulesetsize, unsigned);
73 first_derives = first_base - ntokens * rulesetsize;
77 rrow = first_derives + ntokens * rulesetsize;
78 for (i = start_symbol; i < nsyms; i++)
80 vrow = EFF + ((i - ntokens) * varsetsize);
82 for (j = start_symbol; j < nsyms; k++, j++)
84 if (k >= BITS_PER_WORD)
90 if (cword & (unsigned)(1 << k))
93 while ((rule = *rp++) >= 0)
104 print_first_derives();
111 closure(Value_t *nucleus, int n)
126 rulesetsize = WORDSIZE(nrules);
127 rsend = ruleset + rulesetsize;
128 for (rsp = ruleset; rsp < rsend; rsp++)
132 for (csp = nucleus; csp < csend; ++csp)
134 symbol = ritem[*csp];
137 dsp = first_derives + symbol * rulesetsize;
145 itemsetend = itemset;
147 for (rsp = ruleset; rsp < rsend; ++rsp)
152 for (i = 0; i < BITS_PER_WORD; ++i)
154 if (word & (unsigned)(1 << i))
156 itemno = rrhs[ruleno + i];
157 while (csp < csend && *csp < itemno)
158 *itemsetend++ = *csp++;
159 *itemsetend++ = itemno;
160 while (csp < csend && *csp == itemno)
165 ruleno += BITS_PER_WORD;
169 *itemsetend++ = *csp++;
177 finalize_closure(void)
191 printf("\n\nn = %d\n\n", n);
192 for (isp = itemset; isp < itemsetend; isp++)
193 printf(" %d\n", *isp);
204 printf("\n\nEpsilon Free Firsts\n");
206 for (i = start_symbol; i < nsyms; i++)
208 printf("\n%s", symbol_name[i]);
209 rowp = EFF + ((i - start_symbol) * WORDSIZE(nvars));
213 for (j = 0; j < nvars; k++, j++)
215 if (k >= BITS_PER_WORD)
222 printf(" %s", symbol_name[start_symbol + j]);
228 print_first_derives(void)
236 printf("\n\n\nFirst Derives\n");
238 for (i = start_symbol; i < nsyms; i++)
240 printf("\n%s derives\n", symbol_name[i]);
241 rp = first_derives + i * WORDSIZE(nrules);
243 for (j = 0; j <= nrules; k++, j++)
245 if (k >= BITS_PER_WORD)
251 if (cword & (1 << k))