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Fix the vm stop checking bug (#2795)

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when the vm executes VM_OC_LESS operation, the lookahead optimization will cause the by-passing of vm stop checking.
Thus we need to disable the optimization here if JERRY_VM_EXEC_STOP is defined.

JerryScript-DCO-1.0-Signed-off-by: Wang Zhikang wzk0406@mail.ustc.edu.cn
This commit is contained in:
wangzhikang123
2019-03-13 22:18:35 +08:00
committed by László Langó
parent 7d48e011c9
commit f3c8eeecb5
1 changed files with 2 additions and 2 deletions
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jerry-core/vm/vm.c
+2 -2
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@@ -2553,7 +2553,7 @@ vm_loop (vm_frame_ctx_t *frame_ctx_p) /**< frame context */
if (ecma_are_values_integer_numbers (left_value, right_value)) if (ecma_are_values_integer_numbers (left_value, right_value))
{ {
bool is_less = (ecma_integer_value_t) left_value < (ecma_integer_value_t) right_value; bool is_less = (ecma_integer_value_t) left_value < (ecma_integer_value_t) right_value;
#ifndef JERRY_VM_EXEC_STOP
/* This is a lookahead to the next opcode to improve performance. /* This is a lookahead to the next opcode to improve performance.
* If it is CBC_BRANCH_IF_TRUE_BACKWARD, execute it. */ * If it is CBC_BRANCH_IF_TRUE_BACKWARD, execute it. */
if (*byte_code_p <= CBC_BRANCH_IF_TRUE_BACKWARD_3 && *byte_code_p >= CBC_BRANCH_IF_TRUE_BACKWARD) if (*byte_code_p <= CBC_BRANCH_IF_TRUE_BACKWARD_3 && *byte_code_p >= CBC_BRANCH_IF_TRUE_BACKWARD)
@@ -2587,7 +2587,7 @@ vm_loop (vm_frame_ctx_t *frame_ctx_p) /**< frame context */
continue; continue;
} }
#endif /* !JERRY_VM_EXEC_STOP */
*stack_top_p++ = ecma_make_boolean_value (is_less); *stack_top_p++ = ecma_make_boolean_value (is_less);
continue; continue;
} }