Implement Proxy object [[setPrototypeOf]] internal method (#3631)

The algorithm is based on ECMA-262 v6, 9.5.2

JerryScript-DCO-1.0-Signed-off-by: Adam Szilagyi aszilagy@inf.u-szeged.hu

tests/jerry/es2015/proxy_set_prototoype_of.js

@@ -12,7 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// TODO: Update these tests when the internal routine has been implemented
+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
 
 var target = {};
 var handler = { setPrototypeOf (target) {
@@ -25,6 +27,132 @@ try {
   // 19.1.2.18
   Object.setPrototypeOf(proxy, {});
   assert(false);
+} catch (e) {
+  assert(e === 42);
+}
+
+// test basic funcionality
+var targetProto = {};
+var target = {
+  foo: false
+};
+
+var handler = {
+  setPrototypeOf(target, targetrProto) {
+    target.foo = true;
+    return false;
+  }
+};
+
+var proxy = new Proxy(target, handler);
+
+assert(Reflect.setPrototypeOf(proxy, targetProto) === false);
+assert(target.foo === true);
+
+try {
+  Object.setPrototypeOf(proxy, targetProto);
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+try {
+  Object.setPrototypeOf(proxy, undefined);
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+try {
+  Object.setPrototypeOf(proxy, 1);
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+var target = {};
+var handler = {};
+var prototype = [];
+
+var proxy = new Proxy(target, handler);
+
+Object.setPrototypeOf(proxy, prototype);
+assert(Object.getPrototypeOf(target) === prototype);
+
+handler.setPrototypeOf = function(target, proto) {
+  return false;
+};
+
+try {
+  Object.setPrototypeOf(proxy, {});
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+handler.setPrototypeOf = function(target, proto) {
+  return undefined;
+};
+
+try {
+  Object.setPrototypeOf(proxy, {});
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+handler.setPrototypeOf = function(proto) {};
+
+try {
+  Object.setPrototypeOf(proxy, {});
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+var proto = {};
+Object.setPrototypeOf(proto, Function.prototype);
+
+var seen_prototype;
+var seen_target;
+
+handler.setPrototypeOf = function(target, proto) {
+  seen_target = target;
+  seen_prototype = proto;
+  return true;
+}
+
+Object.setPrototypeOf(proxy, proto);
+assert(target === seen_target);
+assert(proto === seen_prototype);
+
+// test when target is proxy
+var target = {};
+var handler = {};
+var handler2 = {};
+var target2 = new Proxy(target, handler2);
+var proxy2 = new Proxy(target2, handler);
+var prototype = [2,3];
+
+Object.setPrototypeOf(proxy2, prototype);
+
+assert(prototype === Object.getPrototypeOf(target));
+
+// test when invariants gets violated
+var target = {};
+var handler = {
+    setPrototypeOf(target, proto) {
+        Object.setPrototypeOf(target, Function.prototype);
+        Object.preventExtensions(target);
+        return true;
+    }
+}
+
+var proxy = new Proxy(target, handler);
+
+try {
+  Object.setPrototypeOf(proxy, Array.prototype);
+  assert(false);
 } catch (e) {
   assert(e instanceof TypeError);
 }

tests/unit-core/test-api.c

@@ -733,21 +733,21 @@ main (void)
 
   if (jerry_is_feature_enabled (JERRY_FEATURE_PROXY))
   {
-    /* Note: update this test when the internal method is implemented */
     jerry_value_t target = jerry_create_object ();
     jerry_value_t handler = jerry_create_object ();
     jerry_value_t proxy = jerry_create_proxy (target, handler);
+    new_proto = jerry_eval ((jerry_char_t *) "Function.prototype", 18, JERRY_PARSE_NO_OPTS);
+
+    res = jerry_set_prototype (proxy, new_proto);
+    TEST_ASSERT (!jerry_value_is_error (res));
+    jerry_value_t target_proto = jerry_get_prototype (target);
+    TEST_ASSERT (target_proto == new_proto);
 
     jerry_release_value (target);
     jerry_release_value (handler);
-    new_proto = jerry_create_object ();
-    res = jerry_set_prototype (proxy, new_proto);
-    jerry_release_value (new_proto);
-    TEST_ASSERT (jerry_value_is_error (res));
-    error = jerry_get_value_from_error (res, true);
-    TEST_ASSERT (jerry_get_error_type (error) == JERRY_ERROR_TYPE);
-    jerry_release_value (error);
     jerry_release_value (proxy);
+    jerry_release_value (new_proto);
+    jerry_release_value (target_proto);
   }
 
   /* Test: eval */