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-rw-r--r--src/mesa/shader/grammar/grammar.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/src/mesa/shader/grammar/grammar.c b/src/mesa/shader/grammar/grammar.c
index 989e954491..a9775961d3 100644
--- a/src/mesa/shader/grammar/grammar.c
+++ b/src/mesa/shader/grammar/grammar.c
@@ -2693,14 +2693,16 @@ fast_match (dict *di, const byte *text, int *index, rule *ru, int *_PP, bytepool
if (status == mr_matched)
{
- if (sp->m_emits != NULL)
- if (emit_push (sp->m_emits, _BP->_F + _P, text[ind - 1], save_ind, &ctx))
+ if (sp->m_emits != NULL) {
+ const byte ch = (ind <= 0) ? 0 : text[ind - 1];
+ if (emit_push (sp->m_emits, _BP->_F + _P, ch, save_ind, &ctx))
{
free_regbyte_ctx_stack (ctx, *rbc);
return mr_internal_error;
}
- _P = _P2;
+ }
+ _P = _P2;
}
/* if the rule operator is a logical or, we pick up the first matching specifier */