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+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-typedarray-buffer-byteoffset-length
+description: >
+ ToIndex(byteOffset) operations
+info: |
+ 22.2.4.5 TypedArray ( buffer [ , byteOffset [ , length ] ] )
+
+ This description applies only if the TypedArray function is called with at
+ least one argument and the Type of the first argument is Object and that
+ object has an [[ArrayBufferData]] internal slot.
+
+ ...
+ 7. Let offset be ? ToIndex(byteOffset).
+ 8. If offset modulo elementSize ≠ 0, throw a RangeError exception.
+ ...
+includes: [testTypedArray.js]
+features: [TypedArray]
+---*/
+
+var buffer = new ArrayBuffer(16);
+
+var obj1 = {
+ valueOf: function() {
+ return 8;
+ }
+};
+
+var obj2 = {
+ toString: function() {
+ return 8;
+ }
+};
+
+var items = [
+ [-0, 0, "-0"],
+ [obj1, 8, "object's valueOf"],
+ [obj2, 8, "object's toString"],
+ ["", 0, "the Empty string"],
+ ["0", 0, "string '0'"],
+ ["8", 8, "string '8'"],
+ [false, 0, "false"],
+ [NaN, 0, "NaN"],
+ [null, 0, "null"],
+ [undefined, 0, "undefined"],
+ [0.1, 0, "0.1"],
+ [0.9, 0, "0.9"],
+ [8.1, 8, "8.1"],
+ [8.9, 8, "8.9"],
+ [-0.1, 0, "-0.1"],
+ [-0.99999, 0, "-0.99999"]
+];
+
+testWithTypedArrayConstructors(function(TA) {
+ items.forEach(function(item) {
+ var offset = item[0];
+ var expected = item[1];
+ var name = item[2];
+
+ var typedArray = new TA(buffer, offset);
+ assert.sameValue(typedArray.byteOffset, expected, name + " byteOffset");
+ assert.sameValue(typedArray.constructor, TA, name + " constructor");
+ assert.sameValue(
+ Object.getPrototypeOf(typedArray),
+ TA.prototype,
+ name + " prototype"
+ );
+ });
+
+ // Testing `true`. See step 8
+ if (TA.BYTES_PER_ELEMENT === 1) {
+ var typedArray = new TA(buffer, true);
+ assert.sameValue(typedArray.byteOffset, 1, "true => 1 byteOffset");
+ assert.sameValue(typedArray.constructor, TA, "true => 1 constructor");
+ assert.sameValue(
+ Object.getPrototypeOf(typedArray),
+ TA.prototype,
+ "true => 1 prototype"
+ );
+ } else {
+ assert.throws(RangeError, function() {
+ new TA(buffer, true);
+ }, "1 modulo elementSize ≠ 0, throws a RangeError");
+ }
+});