Rework Map object (#2760)

This patch reworks the core of the builtin Map object.

Advantages:
 - Provide sublinear access time for the elements via Lcache and property hashmap
 - This implementation is suitable for the builtin Set object as well

Also add the missing 'forEach' routine for the builtin object as well.

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu

tests/jerry/es2015/map-prototype-foreach.js

@@ -0,0 +1,108 @@
+/* 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.
+ */
+
+var map = new Map();
+
+/* Test when the map object keys are strings */
+for (var i = 0; i < 15; i++) {
+  map.set ("foo" + i, i);
+  assert (map.size === i + 1);
+}
+
+var counter = 0;
+
+map.forEach (function (value, key) {
+  assert (typeof key === "string");
+  assert (key === "foo" + counter);
+  assert (typeof value === "number");
+  assert (value === counter);
+  counter++;
+});
+
+map.clear ();
+assert (map.size === 0);
+counter = 0;
+
+/* Test when the map object keys are numbers */
+for (var i = 0; i < 15; i++) {
+  map.set (i + 0.5, "foo" + i);
+  assert (map.size === i + 1);
+}
+
+map.forEach (function (value, key) {
+  assert (typeof key === "number");
+  assert (key === counter + 0.5);
+  assert (typeof value === "string");
+  assert (value === "foo" + counter);
+  counter++;
+});
+
+map.clear ();
+assert (map.size === 0);
+counter = 0;
+
+var objectList = [];
+
+/* Test when the map object keys are objects */
+for (var i = 0; i < 15; i++) {
+  objectList[i] = { index : i };
+  map.set (objectList[i], "foo" + i);
+  assert (map.size === i + 1);
+}
+
+map.forEach (function (value, key) {
+  assert (typeof key === "object");
+  assert (key === objectList[counter]);
+  assert (key.index === objectList[counter].index);
+  assert (typeof value === "string");
+  assert (value === "foo" + counter);
+  counter++;
+});
+
+/* Test when the this argument is not a map object */
+try {
+  Map.prototype.forEach.call ({});
+  assert (false);
+} catch (e) {
+  assert (e instanceof TypeError);
+}
+
+/* Test when the 1st argument is not callable */
+try {
+  map.forEach (5);
+  assert (false);
+} catch (e) {
+  assert (e instanceof TypeError);
+}
+
+/* Test when the the callback function throws error */
+try {
+  map.forEach (function (value, key) {
+    throw new ReferenceError ("foo");
+  });
+  assert (false);
+} catch (e) {
+  assert (e instanceof ReferenceError);
+  assert (e.message === "foo");
+}
+
+/* Test when the 2nd optional argument is present */
+var object = {
+  _secret : 42
+}
+
+map.forEach (function (value, key) {
+  assert (this._secret === 42);
+}, object);

tests/jerry/es2015/map.js

@@ -73,6 +73,43 @@ assert(m.get(1) === 8);
 assert(m.get(2) === 8);
 assert(m.get(3) === 8);
 
+m.set(NaN, "not a number");
+assert(m.size === 4);
+assert(m.get(NaN) === "not a number");
+assert(m.get(Number("foo")) === "not a number")
+
+m.set(0, "PosZero");
+assert(m.size === 5);
+m.set(-0, "NegZero");
+assert(m.size === 5);
+assert(m.get (0) === "NegZero");
+assert(m.get (-0) === "NegZero");
+
+var symbolFoo = Symbol ("foo");
+m.set (symbolFoo, "SymbolFoo");
+assert(m.size === 6);
+assert(m.get(symbolFoo) === "SymbolFoo");
+
+var object = {};
+m.set (object, "object");
+assert(m.size === 7);
+assert(m.get(object) === "object");
+assert(m.get({}) === undefined);
+
+var myObj = { o : 4 };
+m.set("foo", myObj);
+assert(m.size === 8);
+assert(m.get ("foo") === myObj);
+assert(m.get ("foo").o === 4);
+
+m.clear();
+assert(m.size === 0);
+
+m.set("foo", myObj);
+assert(m.size === 1);
+assert(m.get ("foo") === myObj);
+assert(m.get ("foo").o === 4);
+
 var mapNameDesc = Object.getOwnPropertyDescriptor (Map, 'name');
 assert(mapNameDesc.value === "Map");
 assert(mapNameDesc.writable === false);