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Preserve snapshot #0 PC for root traces.

master
Mike Pall 2012-05-14 17:35:05 +02:00
parent e6bcb545f8
commit f3197046b8
1 changed files with 5 additions and 0 deletions
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5
src/lj_snap.c
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@ -136,6 +136,11 @@ void lj_snap_add(jit_State *J)
/* Merge if no ins. inbetween or if requested and no guard inbetween. */
if (J->mergesnap ? !irt_isguard(J->guardemit) :
(nsnap > 0 && J->cur.snap[nsnap-1].ref == J->cur.nins)) {
if (nsnap == 1 && J->parent == 0) {
/* But preserve snap #0 PC for root traces. */
J->mergesnap = 0;
return;
}
nsnapmap = J->cur.snap[--nsnap].mapofs;
} else {
lj_snap_grow_buf(J, nsnap+1);