From fd47929742453b4c718179f19587f3ddd8af83ef Mon Sep 17 00:00:00 2001
From: legendecas <legendecas@gmail.com>
Date: Tue, 30 Apr 2019 17:36:04 +0800
Subject: [PATCH] Add core API jerry_value_instanceof

JerryScript-DCO-1.0-Signed-off-by: legendecas legendecas@gmail.com
---
 jerry-core/api/jerry.c                | 15 +++++++++++++++
 jerry-core/include/jerryscript-core.h |  1 +
 tests/unit-core/test-api.c            |  1 +
 3 files changed, 17 insertions(+)

diff --git a/jerry-core/api/jerry.c b/jerry-core/api/jerry.c
index 0664e86612..cf9cc0f1bb 100644
--- a/jerry-core/api/jerry.c
+++ b/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.
  *
diff --git a/jerry-core/include/jerryscript-core.h b/jerry-core/include/jerryscript-core.h
index 60805eee35..a309830185 100644
--- a/jerry-core/include/jerryscript-core.h
+++ b/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.
diff --git a/tests/unit-core/test-api.c b/tests/unit-core/test-api.c
index 09ec226c05..0850e91043 100644
--- a/tests/unit-core/test-api.c
+++ b/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");