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Instead of mapping the LHS of unused rules to -1, keep the LHS

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valid, but flag the rules as invalid.
* src/gram.h (rule_t): `useful' is a new member.
* src/print.c (print_grammar): Adjust.
* src/derives.c (set_derives): Likewise.
* src/reader.c (packgram, reduce_output): Likewise.
* src/reduce.c (reduce_grammar_tables): Likewise.
* tests/reduce.at (Underivable Rules, Useless Rules): New.
This commit is contained in:
Akim Demaille
2001-11-30 10:49:24 +00:00
parent d2d1b42b07
commit 68f1e3edc3
7 changed files with 131 additions and 30 deletions
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src/reader.c
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@@ -1971,6 +1971,7 @@ packgram (void)
rule_table[ruleno].lhs = p->sym->value;
rule_table[ruleno].rhs = itemno;
rule_table[ruleno].line = p->line;
rule_table[ruleno].useful = TRUE;
p = p->next;
while (p && p->sym)