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vm: Detect stack underflow in addition to overflow.

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This commit is contained in:
Paul Sokolovsky 2014-05-31 18:14:54 +03:00
parent ae9c82d5f3
commit ff8da0b835
1 changed files with 7 additions and 0 deletions
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py/vm.c
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@ -158,6 +158,13 @@ mp_vm_return_kind_t mp_execute_bytecode(const byte *code, const mp_obj_t *args,
mp_vm_return_kind_t vm_return_kind = mp_execute_bytecode2(code, &ip, &state[n_state - 1], &sp, exc_stack, &exc_sp, MP_OBJ_NULL);
#if DETECT_VM_STACK_OVERFLOW
if (vm_return_kind == MP_VM_RETURN_NORMAL) {
if (sp != state) {
printf("Stack misalign: %d\n", sp - state);
assert(0);
}
}
// We can't check the case when an exception is returned in state[n_state - 1]
// and there are no arguments, because in this case our detection slot may have
// been overwritten by the returned exception (which is allowed).