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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 10:46:08 +00:00
parent d287d66a69
commit d39a6b7ca9
7 changed files with 131 additions and 30 deletions
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2
src/print.c
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@@ -216,7 +216,7 @@ print_grammar (FILE *out)
fprintf (out, " %s\n", _("Number, Line, Rule"));
for (i = 1; i <= nrules; i++)
/* Don't print rules disabled in reduce_grammar_tables. */
if (rule_table[i].lhs >= 0)
if (rule_table[i].useful)
{
fprintf (out, _(" %3d %3d %s ->"),
i, rule_table[i].line, tags[rule_table[i].lhs]);