Implement ToPropertyKey operation (#3966)

From ES 6 the ToPropertyKey operation is used to convert elements to a valid property key.
This "new" method uses the ToPrimitive operation which can call the `@@ToPrimitive`
well-known symbol to convert the given element to a key.

JerryScript-DCO-1.0-Signed-off-by: Peter Gal pgal.usz@partner.samsung.com

tests/jerry/es.next/to-property-key.js

@@ -0,0 +1,126 @@
+// 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.
+
+/* Test if the ToPropertyKey operation calls the @@ToPrimitive symbol */
+
+var obj_A = {};
+var sym = Symbol();
+
+var toprimitive_called = 0;
+
+var wrap = {
+    [Symbol.toPrimitive]: function() {
+        toprimitive_called++;
+        return sym;
+    }
+};
+
+/* <object>.hasOwnProperty calls the ToPropertyKey operation */
+assert (obj_A.hasOwnProperty (wrap) === false);
+assert (toprimitive_called === 1);
+
+/* "in" operator calls the ToPropertyKey operation */
+assert ((wrap in obj_A) === false);
+assert (toprimitive_called === 2);
+
+obj_A[sym] = 0;
+
+/* <object>.hasOwnProperty calls the ToPropertyKey operation */
+assert (obj_A.hasOwnProperty (wrap) === true);
+assert (toprimitive_called === 3);
+
+/* "in" operator calls the ToPropertyKey operation */
+assert ((wrap in obj_A) === true);
+assert (toprimitive_called === 4);
+
+
+var obj_B = {};
+
+/* <object>.hasOwnProperty calls the ToPropertyKey operation */
+assert (obj_B.hasOwnProperty (wrap) === false);
+assert (toprimitive_called === 5);
+
+/* Object.defineProperty calls the ToPropertyKey operation */
+Object.defineProperty (obj_B, wrap, {
+  value: -1,
+  enumerable: false,
+  configurable: true,
+  writable: true
+});
+assert (toprimitive_called === 6);
+
+assert (obj_B[sym] === -1);
+
+/* Object.getOwnPropertyDescriptor calls the ToPropertyKey operation */
+var desc = Object.getOwnPropertyDescriptor (obj_B, wrap);
+assert (toprimitive_called === 7);
+
+assert (desc.value === -1);
+assert (desc.enumerable === false);
+assert (desc.configurable === true);
+assert (desc.writable === true);
+
+/* Reflect.get calls the ToPropertyKey operation */
+assert (Reflect.get (obj_B, wrap) === -1);
+assert (toprimitive_called === 8);
+
+/* Reflect.deleteProperty calls the ToPropertyKey operation */
+assert (Reflect.deleteProperty (obj_B, wrap) === true);
+assert (toprimitive_called === 9);
+
+/* Reflect.has calls the ToPropertyKey operation */
+assert (Reflect.has (obj_B, wrap) === false);
+assert (toprimitive_called === 10);
+
+/* Reflect.defineProperty calls the ToPropertyKey operation */
+Reflect.defineProperty (obj_B, wrap, {
+  value: 50,
+  enumerable: false,
+  configurable: true,
+  writable: true
+});
+
+assert (toprimitive_called === 11);
+
+/* Reflect.getOwnPropertyDescriptor calls the ToPropertyKey operation */
+var desc_B = Reflect.getOwnPropertyDescriptor (obj_B, wrap);
+assert (toprimitive_called === 12);
+
+assert (desc_B.value === 50);
+assert (desc_B.enumerable === false);
+assert (desc_B.configurable === true);
+assert (desc_B.writable === true);
+
+/* Delete calls the ToPropertyKey operation */
+delete obj_B[wrap];
+assert (toprimitive_called === 13);
+
+/* Get calls the ToPropertyKey operation */
+assert (obj_B[wrap] === undefined);
+assert (toprimitive_called === 14);
+
+/* Computed property calls the ToPropertyKey operation */
+var obj_C = {
+    [wrap]: function() { return 100; }
+};
+assert (toprimitive_called === 15);
+assert (obj_C[sym]() === 100);
+
+/* Setter/Getter will each call the ToPropertyKey operation */
+var obj_D = {
+    get [wrap] () { return 150; },
+    set [wrap] (value) { }
+};
+assert (toprimitive_called === 17);
+assert (obj_D[sym] === 150);

tests/test262-es6-excludelist.xml

@@ -61,12 +61,6 @@
   <test id="built-ins/decodeURI/S15.1.3.1_A2.5_T1.js"><reason></reason></test>
   <test id="built-ins/GeneratorPrototype/next/context-constructor-invocation.js"><reason></reason></test>
   <test id="built-ins/Map/prototype/Symbol.iterator.js"><reason></reason></test>
-  <test id="built-ins/Object/prototype/hasOwnProperty/symbol_property_toPrimitive.js"><reason></reason></test>
-  <test id="built-ins/Object/prototype/hasOwnProperty/symbol_property_toString.js"><reason></reason></test>
-  <test id="built-ins/Object/prototype/hasOwnProperty/symbol_property_valueOf.js"><reason></reason></test>
-  <test id="built-ins/Object/prototype/propertyIsEnumerable/symbol_property_toPrimitive.js"><reason></reason></test>
-  <test id="built-ins/Object/prototype/propertyIsEnumerable/symbol_property_toString.js"><reason></reason></test>
-  <test id="built-ins/Object/prototype/propertyIsEnumerable/symbol_property_valueOf.js"><reason></reason></test>
   <test id="built-ins/Promise/all/invoke-then.js"><reason></reason></test>
   <test id="built-ins/Promise/all/species-get-error.js"><reason></reason></test>
   <test id="built-ins/Promise/exec-args.js"><reason></reason></test>