Add %TypedArray%.prototype.subarray([ begin [, end ] ]) support. (#2410)

JerryScript-DCO-1.0-Signed-off-by: Anthony Calandra anthony@anthony-calandra.com

tests/jerry/es2015/typedArray-subarray.js

@@ -0,0 +1,48 @@
+/* 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 a = new Int32Array([1, 2, 3, 4, 5]);
+assert(a.subarray().toString() === '1,2,3,4,5');
+assert(a.subarray(3).toString() === '4,5');
+assert(a.subarray(1, 3).toString() === '2,3');
+assert(a.subarray(-3).toString() === '3,4,5');
+assert(a.subarray(-3, -1).toString() === '3,4');
+assert(a.subarray(3, 2).toString() === '');
+assert(a.subarray(-2, -3).toString() === '');
+assert(a.subarray(4, 1).toString() === '');
+assert(a.subarray(-1, -4).toString() === '');
+assert(a.subarray(1).subarray(1).toString() === '3,4,5');
+assert(a.subarray(1, 4).subarray(1, 2).toString() === '3');
+
+var b = new Uint8Array([]);
+assert(b.subarray(123456, -123456).toString() === '');
+assert(b.subarray().subarray().toString() === '');
+
+var ab = new ArrayBuffer(28);
+var tmp = new Int32Array(ab);
+tmp.set([0, 1, 2, 3, 4, 5, 0]);
+var c = new Int32Array(ab, 4, 5);
+assert(c.toString() === '1,2,3,4,5');
+assert(c.subarray().toString() === '1,2,3,4,5');
+assert(c.subarray(3).toString() === '4,5');
+assert(c.subarray(1, 3).toString() === '2,3');
+assert(c.subarray(-3).toString() === '3,4,5');
+assert(c.subarray(-3, -1).toString() === '3,4');
+assert(c.subarray(3, 2).toString() === '');
+assert(c.subarray(-2, -3).toString() === '');
+assert(c.subarray(4, 1).toString() === '');
+assert(c.subarray(-1, -4).toString() === '');
+assert(c.subarray(1).subarray(1).toString() === '3,4,5');
+assert(c.subarray(1, 4).subarray(1, 2).toString() === '3');