Re-target for ES.Next (#3901)

A list of changes:
- 'es2015-subset' profile is deprecated, and an 'es.next' profile is added.
- The default profile is changed to 'es.next'
- Renamed the JERRY_ES2015 guard to JERRY_ESNEXT
- Renamed JERRY_ES2015_BUILTIN_* guards to JERRY_BUILTIN_*
- Moved es2015 specific tests to a new 'es.next' subdirectory
- Updated docs, targets, and test runners to reflect these changes

Resolves #3737.

JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai dbatyai@inf.u-szeged.hu

tests/jerry/es.next/proxy_is_extensible.js

@@ -0,0 +1,164 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// 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.
+
+// error checks
+var target = {};
+var handler = { isExtensible (target) {
+  throw 42;
+}};
+
+var proxy = new Proxy(target, handler);
+
+try {
+  // 7.3.15
+  Object.isFrozen(proxy)
+  assert(false);
+} catch (e) {
+  assert(e === 42);
+}
+
+try {
+  // 7.3.15
+  Object.isSealed(proxy)
+  assert(false);
+} catch (e) {
+  assert(e === 42);
+}
+
+try {
+  // 7.2.5
+  Object.isExtensible(proxy)
+  assert(false);
+} catch (e) {
+  assert(e === 42);
+}
+
+// no trap
+var target = {};
+var handler = {};
+var proxy = new Proxy(target, handler);
+assert(Object.isExtensible(target) === true)
+assert(Object.isExtensible(proxy) === true);
+Object.preventExtensions(target);
+assert(Object.isExtensible(target) === false);
+assert(Object.isExtensible(proxy) === false);
+
+// undefined trap
+var target = {};
+var handler =  { isExtensible: null };
+var proxy = new Proxy(target, handler);
+assert(Object.isExtensible(target) === true)
+assert(Object.isExtensible(proxy) === true);
+Object.preventExtensions(target);
+assert(Object.isExtensible(target) === false);
+assert(Object.isExtensible(proxy) === false);
+
+// invalid trap
+var target = {};
+var handler =  { isExtensible: true };
+var proxy = new Proxy(target, handler);
+
+try {
+  Object.isExtensible(proxy);
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError); 
+}
+
+// valid trap
+var target = { prop1: true };
+var handler = {
+  isExtensible(target) {
+    target.prop1 = false;
+    return Object.isExtensible(target);
+  }
+};
+
+var proxy = new Proxy(target, handler);
+assert(Object.isExtensible(proxy) === true);
+assert(target.prop1 === false);
+Object.preventExtensions(target);
+assert(Object.isExtensible(target) === false);
+assert(Object.isExtensible(proxy) === false);
+
+// trap result is invalid
+var target = {};
+var handler = {
+  isExtensible(target) {
+    return false;
+  }
+};
+
+var proxy = new Proxy(target, handler);
+
+try {
+  Object.isExtensible(proxy);
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+// handler is null
+var target = {};
+var handler = { 
+  isExtensible (target) {
+    return Object.isExtensible(target);
+  }
+};
+
+var revocable = Proxy.revocable (target, {});
+var proxy = revocable.proxy;
+revocable.revoke();
+
+try {
+  Object.isExtensible(proxy);
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+// proxy within proxy
+var target = {};
+var handler1 = {
+  isExtensible(target) {
+    return Object.isExtensible(target);
+  }
+};
+
+var handler2 = {
+  isExtensible(target) {
+    return false;
+  }
+};
+
+var proxy = new Proxy(target, handler1);
+var proxy2 = new Proxy(proxy, handler1);
+assert(Object.isExtensible(proxy2) === true);
+
+var proxy3 = new Proxy(proxy, handler2);
+
+try {
+  Object.isExtensible(proxy3);
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+var proxy4 = new Proxy(proxy2, handler1);
+Object.preventExtensions(target);
+assert(Object.isExtensible(proxy4) === false);