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Restore state when recording __concat metamethod throws an error.

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Thanks to Sergey Kaplun. #1234
This commit is contained in:
Mike Pall 2024-07-04 00:48:49 +02:00
parent 510f88d468
commit 7421a1b33c
1 changed files with 24 additions and 2 deletions
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26
src/lj_record.c
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@ -1025,7 +1025,9 @@ void lj_record_ret(jit_State *J, BCReg rbase, ptrdiff_t gotresults)
J->L->base = b + baseadj;
copyTV(J->L, b-(2<<LJ_FR2), &save);
}
if (tr) { /* Store final result. */
if (tr >= 0xffffff00) {
lj_err_throw(J->L, -(int32_t)tr); /* Propagate errors. */
} else if (tr) { /* Store final result. */
BCReg dst = bc_a(*(frame_contpc(frame)-1));
J->base[dst] = tr;
if (dst >= J->maxslot) {
@ -2075,12 +2077,27 @@ static TRef rec_tnew(jit_State *J, uint32_t ah)
/* -- Concatenation ------------------------------------------------------- */
typedef struct RecCatDataCP {
jit_State *J;
RecordIndex *ix;
} RecCatDataCP;
static TValue *rec_mm_concat_cp(lua_State *L, lua_CFunction dummy, void *ud)
{
RecCatDataCP *rcd = (RecCatDataCP *)ud;
UNUSED(L); UNUSED(dummy);
rec_mm_arith(rcd->J, rcd->ix, MM_concat); /* Call __concat metamethod. */
return NULL;
}
static TRef rec_cat(jit_State *J, BCReg baseslot, BCReg topslot)
{
TRef *top = &J->base[topslot];
TValue savetv[5+LJ_FR2];
BCReg s;
RecordIndex ix;
RecCatDataCP rcd;
int errcode;
lj_assertJ(baseslot < topslot, "bad CAT arg");
for (s = baseslot; s <= topslot; s++)
(void)getslot(J, s); /* Ensure all arguments have a reference. */
@ -2116,8 +2133,11 @@ static TRef rec_cat(jit_State *J, BCReg baseslot, BCReg topslot)
ix.tab = top[-1];
ix.key = top[0];
memcpy(savetv, &J->L->base[topslot-1], sizeof(savetv)); /* Save slots. */
rec_mm_arith(J, &ix, MM_concat); /* Call __concat metamethod. */
rcd.J = J;
rcd.ix = &ix;
errcode = lj_vm_cpcall(J->L, NULL, &rcd, rec_mm_concat_cp);
memcpy(&J->L->base[topslot-1], savetv, sizeof(savetv)); /* Restore slots. */
if (errcode) return (TRef)(-errcode);
return 0; /* No result yet. */
}
@ -2440,6 +2460,8 @@ void lj_record_ins(jit_State *J)
case BC_CAT:
rc = rec_cat(J, rb, rc);
if (rc >= 0xffffff00)
lj_err_throw(J->L, -(int32_t)rc); /* Propagate errors. */
break;
/* -- Constant and move ops --------------------------------------------- */