7
static unsigned *first_derives;
13
register unsigned *row;
20
rowsize = WORDSIZE(nvars);
21
EFF = NEW2(nvars * rowsize, unsigned);
24
for (i = start_symbol; i < nsyms; i++)
27
for (rule = *sp; rule > 0; rule = *++sp)
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symbol = ritem[rrhs[rule]];
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symbol -= start_symbol;
39
reflexive_transitive_closure(EFF, nvars);
47
void set_first_derives()
49
register unsigned *rrow;
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register unsigned *vrow;
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register unsigned mask;
53
register unsigned cword;
61
rulesetsize = WORDSIZE(nrules);
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varsetsize = WORDSIZE(nvars);
63
first_derives = NEW2(nvars * rulesetsize, unsigned) - ntokens * rulesetsize;
67
rrow = first_derives + ntokens * rulesetsize;
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for (i = start_symbol; i < nsyms; i++)
70
vrow = EFF + ((i - ntokens) * varsetsize);
73
for (j = start_symbol; j < nsyms; j++)
78
while ((rule = *rp++) >= 0)
97
print_first_derives();
104
void closure(Yshort *nucleus, int n)
107
register unsigned word;
108
register unsigned mask;
109
register Yshort *csp;
110
register unsigned *dsp;
111
register unsigned *rsp;
112
register int rulesetsize;
119
rulesetsize = WORDSIZE(nrules);
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rsend = ruleset + rulesetsize;
122
for (rsp = ruleset; rsp < rsend; rsp++)
126
for (csp = nucleus; csp < csend; ++csp)
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symbol = ritem[*csp];
131
dsp = first_derives + symbol * rulesetsize;
139
itemsetend = itemset;
141
for (rsp = ruleset; rsp < rsend; ++rsp)
145
ruleno += BITS_PER_WORD;
153
itemno = rrhs[ruleno];
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while (csp < csend && *csp < itemno)
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*itemsetend++ = *csp++;
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*itemsetend++ = itemno;
157
while (csp < csend && *csp == itemno)
168
*itemsetend++ = *csp++;
177
void finalize_closure()
181
FREE(first_derives + ntokens * WORDSIZE(nrules));
187
void print_closure(int n)
189
register Yshort *isp;
191
printf("\n\nn = %d\n\n", n);
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for (isp = itemset; isp < itemsetend; isp++)
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printf(" %d\n", *isp);
200
register unsigned *rowp;
201
register unsigned word;
202
register unsigned mask;
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; j++)
216
printf(" %s", symbol_name[start_symbol + j]);
229
void print_first_derives()
233
register unsigned *rp;
234
register unsigned cword;
235
register unsigned mask;
237
printf("\n\n\nFirst Derives\n");
239
for (i = start_symbol; i < nsyms; i++)
241
printf("\n%s derives\n", symbol_name[i]);
242
rp = first_derives + i * WORDSIZE(nrules);
245
for (j = 0; j <= nrules; j++)