Implement the for of statement (#2871)

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

tests/jerry/es2015/for-of.js

@@ -0,0 +1,117 @@
+// 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.
+
+function parse (txt) {
+  try {
+    eval (txt)
+    assert (false)
+  } catch (e) {
+    assert (e instanceof SyntaxError)
+  }
+}
+
+function checkError (obj) {
+  try {
+    for (var a of obj);
+    assert (false)
+  } catch (e) {
+    assert (e instanceof TypeError)
+  }
+}
+
+var arr = [1,2,3,4]
+
+var forOf =
+  "for var prop of obj" +
+  "   obj [prop] += 4"
+parse (forOf)
+
+var forOf =
+  "for [var prop of obj]" +
+  "   obj[prop] += 4;"
+parse (forOf)
+
+var forOf =
+  "for (var prop obj)" +
+  "   obj[prop] += 4;"
+parse (forOf)
+
+var forOf =
+  "foreach (var prop of obj)" +
+  "   obj[prop] += 4;"
+parse (forOf)
+
+checkError(5)
+
+var obj = {}
+Object.defineProperty(obj, Symbol.iterator, { get : function () { throw TypeError ('foo');}});
+checkError (obj);
+
+var obj = {
+  [Symbol.iterator] : 5
+}
+
+checkError (obj);
+
+var obj = {
+  [Symbol.iterator] () {
+    return 5
+  }
+}
+
+checkError(obj);
+
+var obj = {
+  [Symbol.iterator] () {
+    return {}
+  }
+}
+checkError(obj);
+
+var obj = {
+  [Symbol.iterator] () {
+    return {
+      next() {
+        return 5;
+      }
+    }
+  }
+}
+checkError(obj);
+
+var array = [0, 1, 2, 3, 4, 5];
+
+var i = 0;
+for (var a of array) {
+  assert (a === i++);
+}
+
+var obj = {
+  [Symbol.iterator]() {
+    return {
+      counter : 0,
+      next () {
+        if (this.counter == 10) {
+          return { done : true, value : undefined };
+        }
+        return { done: false, value: this.counter++ };
+      }
+    }
+  }
+}
+
+var i = 0;
+for (var a of obj) {
+  assert (a === i++);
+}

tests/unit-core/test-snapshot.c

@@ -223,7 +223,7 @@ main (void)
     /* Check the snapshot data. Unused bytes should be filled with zeroes */
     const uint8_t expected_data[] =
     {
-      0x4A, 0x52, 0x52, 0x59, 0x16, 0x00, 0x00, 0x00,
+      0x4A, 0x52, 0x52, 0x59, 0x17, 0x00, 0x00, 0x00,
       0x00, 0x00, 0x00, 0x00, 0x48, 0x00, 0x00, 0x00,
       0x01, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00,
       0x03, 0x00, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00,