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lalr: clarify the API

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* src/state.h, src/state.c (state_reduction_find): Clarify.
Die on errors.
* src/lalr.c (goto_list_new): New.
Use it.
This commit is contained in:
Akim Demaille
2019-02-27 18:33:47 +01:00
parent c837141832
commit e062b9f70d
3 changed files with 14 additions and 6 deletions
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16
src/lalr.c
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@@ -54,8 +54,16 @@ typedef struct goto_list
goto_number value;
} goto_list;
static goto_list *
goto_list_new (goto_number value, struct goto_list *next)
{
goto_list *res = xmalloc (sizeof *res);
res->next = next;
res->value = value;
return res;
}
/* LA is an NLA by NTOKENS matrix of bits. LA[l, i] is 1 if the rule
/* LA is an nLA by NTOKENS matrix of bits. LA[l, i] is 1 if the rule
LArule[l] is applicable in the appropriate state when the next
token is symbol i. If LA[l, i] and LA[l, j] are both 1 for i != j,
it is a conflict. */
@@ -232,10 +240,8 @@ static void
add_lookback_edge (state *s, rule const *r, goto_number gotono)
{
int ri = state_reduction_find (s, r);
goto_list *sp = xmalloc (sizeof *sp);
sp->next = lookback[(s->reductions->lookahead_tokens - LA) + ri];
sp->value = gotono;
lookback[(s->reductions->lookahead_tokens - LA) + ri] = sp;
int idx = (s->reductions->lookahead_tokens - LA) + ri;
lookback[idx] = goto_list_new (gotono, lookback[idx]);
}