Add core API jerry_value_instanceof

jerry-core/api/jerry.c

@@ -807,6 +807,21 @@ jerry_value_is_undefined (const jerry_value_t value) /**< api value */
   return ecma_is_value_undefined (value);
 } /* jerry_value_is_undefined */
 
+/**
+ * Perform instanceof check on the specified two operands.
+ *
+ * @return true  - if the left hand side is instance of right hand side,
+ *         false - otherwise.
+ */
+bool
+jerry_value_instanceof (const jerry_value_t value, const jerry_value_t proto)
+{
+  jerry_assert_api_available ();
+
+  ecma_value_t ret = ecma_op_object_has_instance (ecma_get_object_from_value (proto), value);
+  return ecma_is_value_true (ret);
+}
+
 /**
  * Perform the base type of the JavaScript value.
  *

jerry-core/include/jerryscript-core.h

@@ -372,6 +372,7 @@ bool jerry_value_is_promise (const jerry_value_t value);
 bool jerry_value_is_string (const jerry_value_t value);
 bool jerry_value_is_symbol (const jerry_value_t value);
 bool jerry_value_is_undefined (const jerry_value_t value);
+bool jerry_value_instanceof(const jerry_value_t value, const jerry_value_t proto);
 
 /**
  * JerryScript API value type information.

tests/unit-core/test-api.c

@@ -450,6 +450,7 @@ main (void)
   val_a = get_property (global_obj_val, "a");
   TEST_ASSERT (!jerry_value_is_error (val_a));
   TEST_ASSERT (jerry_value_is_object (val_a));
+  TEST_ASSERT (jerry_value_instanceof (val_a, val_A));
 
   /* Get a.t */
   res = get_property (val_a, "t");