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grammar: warn about unused precedence for symbols

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Symbols with precedence but no associativity, and whose precedence is
never used, can be declared with %token instead.  The used precedence
relationships are recorded and a warning about useless ones is issued.

* src/conflicts.c (resolve_sr_conflict): Record precedence relation.
* src/symtab.c, src/symtab.h (prec_nodes, init_prec_nodes)
(symgraphlink_new, register_precedence_second_symbol)
(print_precedence_warnings): New.
Record relationships in a graph and warn about useless ones.
* src/main.c (main): Print precedence warnings.
* tests/conflicts.at: New.
This commit is contained in:
Valentin Tolmer
2013-01-29 14:55:53 +01:00
committed by Akim Demaille
parent fbecd2ab59
commit 284bc49c83
6 changed files with 211 additions and 1 deletions
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2
src/conflicts.c
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@@ -276,11 +276,13 @@ resolve_sr_conflict (state *s, int ruleno, symbol **errors, int *nerrs)
The precedence of shifting is that of token i. */
if (symbols[i]->prec < redprec)
{
register_precedence (redrule->prec->number, i);
log_resolution (redrule, i, reduce_resolution);
flush_shift (s, i);
}
else if (symbols[i]->prec > redprec)
{
register_precedence (i, redrule->prec->number);
log_resolution (redrule, i, shift_resolution);
flush_reduce (lookahead_tokens, i);
}