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Fix use-def analysis for vararg functions.

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Reported by Shmuel Zeigerman.
This commit is contained in:
Mike Pall 2021-05-29 15:31:13 +02:00
parent 2801500a26
commit 0e53a314d7
1 changed files with 4 additions and 2 deletions
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6
src/lj_snap.c
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@ -271,8 +271,10 @@ static BCReg snap_usedef(jit_State *J, uint8_t *udf,
void lj_snap_purge(jit_State *J)
{
uint8_t udf[SNAP_USEDEF_SLOTS];
BCReg maxslot = J->maxslot;
BCReg s = snap_usedef(J, udf, J->pc, maxslot);
BCReg s, maxslot = J->maxslot;
if (bc_op(*J->pc) == BC_FUNCV && maxslot > J->pt->numparams)
maxslot = J->pt->numparams;
s = snap_usedef(J, udf, J->pc, maxslot);
for (; s < maxslot; s++)
if (udf[s] != 0)
J->base[s] = 0; /* Purge dead slots. */