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Do not patch parent exit for a stack check.

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Mike Pall 2010-02-22 21:21:52 +01:00
parent 659ea9de7b
commit f751cd1d6f
1 changed files with 8 additions and 0 deletions
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8
src/lj_asm.c
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@ -3532,8 +3532,16 @@ void lj_asm_patchexit(jit_State *J, Trace *T, ExitNo exitno, MCode *target)
MSize len = T->szmcode;
MCode *px = exitstub_addr(J, exitno) - 6;
MCode *pe = p+len-6;
uint32_t stateaddr = u32ptr(&J2G(J)->vmstate);
if (len > 5 && p[len-5] == XI_JMP && p+len-6 + *(int32_t *)(p+len-4) == px)
*(int32_t *)(p+len-4) = (int32_t)(target - (p+len));
/* Do not patch parent exit for a stack check. Skip beyond vmstate update. */
for (; p < pe; p++)
if (*(uint32_t *)(p+(LJ_64 ? 3 : 2)) == stateaddr && p[0] == XI_MOVmi) {
p += LJ_64 ? 11 : 10;
break;
}
lua_assert(p < pe);
for (; p < pe; p++) {
if ((*(uint16_t *)p & 0xf0ff) == 0x800f && p + *(int32_t *)(p+2) == px) {
*(int32_t *)(p+2) = (int32_t)(target - (p+6));