// Copyright 2013 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// ArrayBuffer

function assertThrows(func, type) {
    var ok = false;
    try {
        func()
    } catch (e) {
        if (type !== undefined)
            ok = (typeof(e) == typeof(new type()))
        else
            ok = true
    }
    if (!ok)
        throw "assertThrows failed"
}

function assertSame(a, b) {
    if (a !== b)
        throw "assertSame failed:" + a + "!==" + b
}

function assertTrue(b) {
    if (!b)
        throw "assertTrue failed:" + b
}

function assertEquals(a, b, delta) {
    if (isNaN(a) && isNaN(b))
        return
    if (!delta && a !== b)
        throw "assertEquals failed:" + a + "!==" + b
    else if (Math.abs(a - b) > delta)
        throw "assertEquals failed: Math.abs(" + a + " - " + b + ") > " + delta
}

function assertArrayEquals(a, b)
{
    if (a.length != b.length)
        throw "assertArrayEquals failed:" + a + "!=" + b
    var i;
    for (i = 0; i < a.length; ++i)
        assertEquals(a[i], b[i])
}

function TestIsViewFalse() {
  assertTrue(!ArrayBuffer.isView());
  assertTrue(!ArrayBuffer.isView(42));
  assertTrue(!ArrayBuffer.isView('foo'));
  assertTrue(!ArrayBuffer.isView(new ArrayBuffer()));
}

TestIsViewFalse();

function TestByteLength(param, expectedByteLength) {
  var ab = new ArrayBuffer(param);
  assertSame(expectedByteLength, ab.byteLength);
}

function TestArrayBufferCreation() {
  TestByteLength(1, 1);
  TestByteLength(256, 256);
  TestByteLength(2.567, 2);

  TestByteLength("abc", 0);

  TestByteLength(0, 0);

  assertThrows(function() { new ArrayBuffer(-10); }, RangeError);
  assertThrows(function() { new ArrayBuffer(-2.567); }, RangeError);

/* TODO[dslomov]: Reenable the test
  assertThrows(function() {
    var ab1 = new ArrayBuffer(0xFFFFFFFFFFFF)
  }, RangeError);
*/

  var ab = new ArrayBuffer();
  assertSame(0, ab.byteLength);
}

TestArrayBufferCreation();

function TestByteLengthNotWritable() {
  var ab = new ArrayBuffer(1024);
  assertSame(1024, ab.byteLength);

  assertThrows(function() { "use strict"; ab.byteLength = 42; }, TypeError);
}

TestByteLengthNotWritable();

function TestSlice(expectedResultLen, initialLen, start, end) {
  var ab = new ArrayBuffer(initialLen);
  var a1 = new Uint8Array(ab);
  for (var i = 0; i < a1.length; i++) {
    a1[i] = 0xCA;
  }
  var slice = ab.slice(start, end);
  assertSame(expectedResultLen, slice.byteLength);
  var a2 = new Uint8Array(slice);
  for (var i = 0; i < a2.length; i++) {
    assertSame(0xCA, a2[i]);
  }
}

function TestArrayBufferSlice() {
  var ab = new ArrayBuffer(1024);
  var ab1 = ab.slice(512, 1024);
  assertSame(512, ab1.byteLength);

  TestSlice(512, 1024, 512, 1024);
  TestSlice(512, 1024, 512);

  TestSlice(0, 0, 1, 20);
  TestSlice(100, 100, 0, 100);
  TestSlice(100, 100, 0, 1000);

  TestSlice(0, 100, 5, 1);

  TestSlice(1, 100, -11, -10);
  TestSlice(9, 100, -10, 99);
  TestSlice(0, 100, -10, 80);
  TestSlice(10, 100, 80, -10);

  TestSlice(10, 100, 90, "100");
  TestSlice(10, 100, "90", "100");

  TestSlice(0,  100, 90, "abc");
  TestSlice(10, 100, "abc", 10);

  TestSlice(10, 100, 0.96, 10.96);
  TestSlice(10, 100, 0.96, 10.01);
  TestSlice(10, 100, 0.01, 10.01);
  TestSlice(10, 100, 0.01, 10.96);

  TestSlice(10, 100, 90);
  TestSlice(10, 100, -10);
}

TestArrayBufferSlice();

// Typed arrays

function TestTypedArray(constr, elementSize, typicalElement) {
  assertSame(elementSize, constr.BYTES_PER_ELEMENT);

  var ab = new ArrayBuffer(256*elementSize);

  var a0 = new constr(30);
  assertTrue(ArrayBuffer.isView(a0));
  assertSame(elementSize, a0.BYTES_PER_ELEMENT);
  assertSame(30, a0.length);
  assertSame(30*elementSize, a0.byteLength);
  assertSame(0, a0.byteOffset);
  assertSame(30*elementSize, a0.buffer.byteLength);

  var aLen0 = new constr(0);
  assertSame(elementSize, aLen0.BYTES_PER_ELEMENT);
  assertSame(0, aLen0.length);
  assertSame(0, aLen0.byteLength);
  assertSame(0, aLen0.byteOffset);
  assertSame(0, aLen0.buffer.byteLength);

  var aOverBufferLen0 = new constr(ab, 128*elementSize, 0);
  assertSame(ab, aOverBufferLen0.buffer);
  assertSame(elementSize, aOverBufferLen0.BYTES_PER_ELEMENT);
  assertSame(0, aOverBufferLen0.length);
  assertSame(0, aOverBufferLen0.byteLength);
  assertSame(128*elementSize, aOverBufferLen0.byteOffset);

  var a1 = new constr(ab, 128*elementSize, 128);
  assertSame(ab, a1.buffer);
  assertSame(elementSize, a1.BYTES_PER_ELEMENT);
  assertSame(128, a1.length);
  assertSame(128*elementSize, a1.byteLength);
  assertSame(128*elementSize, a1.byteOffset);


  var a2 = new constr(ab, 64*elementSize, 128);
  assertSame(ab, a2.buffer);
  assertSame(elementSize, a2.BYTES_PER_ELEMENT);
  assertSame(128, a2.length);
  assertSame(128*elementSize, a2.byteLength);
  assertSame(64*elementSize, a2.byteOffset);

  var a3 = new constr(ab, 192*elementSize);
  assertSame(ab, a3.buffer);
  assertSame(64, a3.length);
  assertSame(64*elementSize, a3.byteLength);
  assertSame(192*elementSize, a3.byteOffset);

  var a4 = new constr(ab);
  assertSame(ab, a4.buffer);
  assertSame(256, a4.length);
  assertSame(256*elementSize, a4.byteLength);
  assertSame(0, a4.byteOffset);


  var i;
  for (i = 0; i < 128; i++) {
    a1[i] = typicalElement;
  }

  for (i = 0; i < 128; i++) {
    assertSame(typicalElement, a1[i]);
  }

  for (i = 0; i < 64; i++) {
    assertSame(0, a2[i]);
  }

  for (i = 64; i < 128; i++) {
    assertSame(typicalElement, a2[i]);
  }

  for (i = 0; i < 64; i++) {
    assertSame(typicalElement, a3[i]);
  }

  for (i = 0; i < 128; i++) {
    assertSame(0, a4[i]);
  }

  for (i = 128; i < 256; i++) {
    assertSame(typicalElement, a4[i]);
  }

  var aAtTheEnd = new constr(ab, 256*elementSize);
  assertSame(elementSize, aAtTheEnd.BYTES_PER_ELEMENT);
  assertSame(0, aAtTheEnd.length);
  assertSame(0, aAtTheEnd.byteLength);
  assertSame(256*elementSize, aAtTheEnd.byteOffset);

  assertThrows(function () { new constr(ab, 257*elementSize); }, RangeError);
  assertThrows(
      function () { new constr(ab, 128*elementSize, 192); },
      RangeError);

  if (elementSize !== 1) {
    assertThrows(function() { new constr(ab, 128*elementSize - 1, 10); },
                 RangeError);
    var unalignedArrayBuffer = new ArrayBuffer(10*elementSize + 1);
    var goodArray = new constr(unalignedArrayBuffer, 0, 10);
    assertSame(10, goodArray.length);
    assertSame(10*elementSize, goodArray.byteLength);
    assertThrows(function() { new constr(unalignedArrayBuffer)}, RangeError);
    assertThrows(function() { new constr(unalignedArrayBuffer, 5*elementSize)},
                 RangeError);
  }

  var aFromString = new constr("30");
  assertSame(elementSize, aFromString.BYTES_PER_ELEMENT);
  assertSame(30, aFromString.length);
  assertSame(30*elementSize, aFromString.byteLength);
  assertSame(0, aFromString.byteOffset);
  assertSame(30*elementSize, aFromString.buffer.byteLength);

  var jsArray = [];
  for (i = 0; i < 30; i++) {
    jsArray.push(typicalElement);
  }
  var aFromArray = new constr(jsArray);
  assertSame(elementSize, aFromArray.BYTES_PER_ELEMENT);
  assertSame(30, aFromArray.length);
  assertSame(30*elementSize, aFromArray.byteLength);
  assertSame(0, aFromArray.byteOffset);
  assertSame(30*elementSize, aFromArray.buffer.byteLength);
  for (i = 0; i < 30; i++) {
    assertSame(typicalElement, aFromArray[i]);
  }

  var abLen0 = new ArrayBuffer(0);
  var aOverAbLen0 = new constr(abLen0);
  assertSame(abLen0, aOverAbLen0.buffer);
  assertSame(elementSize, aOverAbLen0.BYTES_PER_ELEMENT);
  assertSame(0, aOverAbLen0.length);
  assertSame(0, aOverAbLen0.byteLength);
  assertSame(0, aOverAbLen0.byteOffset);

  var aNoParam = new constr();
  assertSame(elementSize, aNoParam.BYTES_PER_ELEMENT);
  assertSame(0, aNoParam.length);
  assertSame(0, aNoParam.byteLength);
  assertSame(0, aNoParam.byteOffset);
}

TestTypedArray(Uint8Array, 1, 0xFF);
TestTypedArray(Int8Array, 1, -0x7F);
TestTypedArray(Uint16Array, 2, 0xFFFF);
TestTypedArray(Int16Array, 2, -0x7FFF);
TestTypedArray(Uint32Array, 4, 0xFFFFFFFF);
TestTypedArray(Int32Array, 4, -0x7FFFFFFF);
TestTypedArray(Float32Array, 4, 0.5);
TestTypedArray(Float64Array, 8, 0.5);
TestTypedArray(Uint8ClampedArray, 1, 0xFF);

function SubarrayTestCase(constructor, item, expectedResultLen, expectedStartIndex,
                          initialLen, start, end) {
  var a = new constructor(initialLen);
  var s = a.subarray(start, end);
  assertSame(constructor, s.constructor);
  assertSame(expectedResultLen, s.length);
  if (s.length > 0) {
    s[0] = item;
    assertSame(item, a[expectedStartIndex]);
  }
}

function TestSubArray(constructor, item) {
  SubarrayTestCase(constructor, item, 512, 512, 1024, 512, 1024);
  SubarrayTestCase(constructor, item, 512, 512, 1024, 512);

  SubarrayTestCase(constructor, item, 0, undefined, 0, 1, 20);
  SubarrayTestCase(constructor, item, 100, 0,       100, 0, 100);
  SubarrayTestCase(constructor, item, 100, 0,       100,  0, 1000);
  SubarrayTestCase(constructor, item, 0, undefined, 100, 5, 1);

  SubarrayTestCase(constructor, item, 1, 89,        100, -11, -10);
  SubarrayTestCase(constructor, item, 9, 90,        100, -10, 99);
  SubarrayTestCase(constructor, item, 0, undefined, 100, -10, 80);
  SubarrayTestCase(constructor, item, 10,80,        100, 80, -10);

  SubarrayTestCase(constructor, item, 10,90,        100, 90, "100");
  SubarrayTestCase(constructor, item, 10,90,        100, "90", "100");

  SubarrayTestCase(constructor, item, 0, undefined, 100, 90, "abc");
  SubarrayTestCase(constructor, item, 10,0,         100, "abc", 10);

  SubarrayTestCase(constructor, item, 10,0,         100, 0.96, 10.96);
  SubarrayTestCase(constructor, item, 10,0,         100, 0.96, 10.01);
  SubarrayTestCase(constructor, item, 10,0,         100, 0.01, 10.01);
  SubarrayTestCase(constructor, item, 10,0,         100, 0.01, 10.96);


  SubarrayTestCase(constructor, item, 10,90,        100, 90);
  SubarrayTestCase(constructor, item, 10,90,        100, -10);

  var method = constructor.prototype.subarray;
  method.call(new constructor(100), 0, 100);
  var o = {};
  assertThrows(function() { method.call(o, 0, 100); }, TypeError);
}

TestSubArray(Uint8Array, 0xFF);
TestSubArray(Int8Array, -0x7F);
TestSubArray(Uint16Array, 0xFFFF);
TestSubArray(Int16Array, -0x7FFF);
TestSubArray(Uint32Array, 0xFFFFFFFF);
TestSubArray(Int32Array, -0x7FFFFFFF);
TestSubArray(Float32Array, 0.5);
TestSubArray(Float64Array, 0.5);
TestSubArray(Uint8ClampedArray, 0xFF);

function TestTypedArrayOutOfRange(constructor, value, result) {
  var a = new constructor(1);
  a[0] = value;
  assertSame(result, a[0]);
}

TestTypedArrayOutOfRange(Uint8Array, 0x1FA, 0xFA);
TestTypedArrayOutOfRange(Uint8Array, -1, 0xFF);

TestTypedArrayOutOfRange(Int8Array, 0x1FA, 0x7A - 0x80);

TestTypedArrayOutOfRange(Uint16Array, 0x1FFFA, 0xFFFA);
TestTypedArrayOutOfRange(Uint16Array, -1, 0xFFFF);
TestTypedArrayOutOfRange(Int16Array, 0x1FFFA, 0x7FFA - 0x8000);

TestTypedArrayOutOfRange(Uint32Array, 0x1FFFFFFFA, 0xFFFFFFFA);
TestTypedArrayOutOfRange(Uint32Array, -1, 0xFFFFFFFF);
TestTypedArrayOutOfRange(Int32Array, 0x1FFFFFFFA, 0x7FFFFFFA - 0x80000000);

TestTypedArrayOutOfRange(Uint8ClampedArray, 0x1FA, 0xFF);
TestTypedArrayOutOfRange(Uint8ClampedArray, -1, 0);

var typedArrayConstructors = [
  Uint8Array,
  Int8Array,
  Uint16Array,
  Int16Array,
  Uint32Array,
  Int32Array,
  Uint8ClampedArray,
  Float32Array,
  Float64Array];

function TestPropertyTypeChecks(constructor) {
  function CheckProperty(name) {
    var d = Object.getOwnPropertyDescriptor(constructor.prototype, name);
    var o = {};
    assertThrows(function() {d.get.call(o);}, TypeError);
    for (var i = 0; i < typedArrayConstructors.length; i++) {
      var ctor = typedArrayConstructors[i];
      var a = new ctor(10);
        /* Lars: According to my interpretation of ecma6 the test below is wrong. The accessors for the buffer etc. properties
          do not check for type matching, are the same for all typed arrays. According to the spec they only check that the
          object has a [[ViewedArrayBuffer]] internal property which they all have.

      if (ctor === constructor) {
        d.get.call(a); // shouldn't throw
      } else {
        assertThrows(function() {d.get.call(a);}, TypeError);
      }

      the below is IMO correct:
      */
        d.get.call(a); // shouldn't throw
        assertThrows(function() {d.get.call({});}, TypeError); // throw on objects that aren't Typed Arrays
    }
  }

  CheckProperty("buffer");
  CheckProperty("byteOffset");
  CheckProperty("byteLength");
  CheckProperty("length");
}

for(i = 0; i < typedArrayConstructors.length; i++) {
  TestPropertyTypeChecks(typedArrayConstructors[i]);
}


function TestTypedArraySet() {
  // Test array.set in different combinations.

  function assertArrayPrefix(expected, array) {
    for (var i = 0; i < expected.length; ++i) {
      assertEquals(expected[i], array[i]);
    }
  }

  var a11 = new Int16Array([1, 2, 3, 4, 0, -1])
  var a12 = new Uint16Array(15)
  a12.set(a11, 3)
  assertArrayPrefix([0, 0, 0, 1, 2, 3, 4, 0, 0xffff, 0, 0], a12)
  assertThrows(function(){ a11.set(a12) })

  var a21 = [1, undefined, 10, NaN, 0, -1, {valueOf: function() {return 3}}]
  var a22 = new Int32Array(12)
  a22.set(a21, 2)
  assertArrayPrefix([0, 0, 1, 0, 10, 0, 0, -1, 3, 0], a22)

  var a31 = new Float32Array([2, 4, 6, 8, 11, NaN, 1/0, -3])
  var a32 = a31.subarray(2, 6)
  a31.set(a32, 4)
  assertArrayPrefix([2, 4, 6, 8, 6, 8, 11, NaN], a31)
  assertArrayPrefix([6, 8, 6, 8], a32)

  var a4 = new Uint8ClampedArray([3,2,5,6])
  a4.set(a4)
  assertArrayPrefix([3, 2, 5, 6], a4)

  // Cases with overlapping backing store but different element sizes.
  var b = new ArrayBuffer(4)
  var a5 = new Int16Array(b)
  var a50 = new Int8Array(b)
  var a51 = new Int8Array(b, 0, 2)
  var a52 = new Int8Array(b, 1, 2)
  var a53 = new Int8Array(b, 2, 2)

  a5.set([0x5050, 0x0a0a])
  assertArrayPrefix([0x50, 0x50, 0x0a, 0x0a], a50)
  assertArrayPrefix([0x50, 0x50], a51)
  assertArrayPrefix([0x50, 0x0a], a52)
  assertArrayPrefix([0x0a, 0x0a], a53)

  a50.set([0x50, 0x50, 0x0a, 0x0a])
  a51.set(a5)
  assertArrayPrefix([0x50, 0x0a, 0x0a, 0x0a], a50)

  a50.set([0x50, 0x50, 0x0a, 0x0a])
  a52.set(a5)
  assertArrayPrefix([0x50, 0x50, 0x0a, 0x0a], a50)

  a50.set([0x50, 0x50, 0x0a, 0x0a])
  a53.set(a5)
  assertArrayPrefix([0x50, 0x50, 0x50, 0x0a], a50)

  a50.set([0x50, 0x51, 0x0a, 0x0b])
  a5.set(a51)
  assertArrayPrefix([0x0050, 0x0051], a5)

  a50.set([0x50, 0x51, 0x0a, 0x0b])
  a5.set(a52)
  assertArrayPrefix([0x0051, 0x000a], a5)

  a50.set([0x50, 0x51, 0x0a, 0x0b])
  a5.set(a53)
  assertArrayPrefix([0x000a, 0x000b], a5)

  // Mixed types of same size.
  var a61 = new Float32Array([1.2, 12.3])
  var a62 = new Int32Array(2)
  a62.set(a61)
  assertArrayPrefix([1, 12], a62)
  a61.set(a62)
  assertArrayPrefix([1, 12], a61)

  // Invalid source
  var a = new Uint16Array(50);
  var expected = [];
  for (i = 0; i < 50; i++) {
    a[i] = i;
    expected.push(i);
  }
  /* Lars: Also here the test is wrong. According to ecma 6 this should throw:
  a.set({});

  but a.set([]) shouldn't
  */
  assertThrows(function() { a.set({}) }, TypeError)
  a.set([])
  assertArrayPrefix(expected, a);
  assertThrows(function() { a.set.call({}) }, TypeError);
  assertThrows(function() { a.set.call([]) }, TypeError);

  assertThrows(function() { a.set(0); }, TypeError);
  assertThrows(function() { a.set(0, 1); }, TypeError);
}

TestTypedArraySet();

function TestTypedArraysWithIllegalIndices() {
  var a = new Int32Array(100);

  a[-10] = 10;
  assertEquals(undefined, a[-10]);
  a["-10"] = 10;
  assertEquals(undefined, a["-10"]);

  var s = "    -10";
  a[s] = 10;
  assertEquals(10, a[s]);
  var s1 = "    -10   ";
  a[s] = 10;
  assertEquals(10, a[s]);

  a["-1e2"] = 10;
  assertEquals(10, a["-1e2"]);
  assertEquals(undefined, a[-1e2]);

  /* Chromium bug: 424619
   * a[-Infinity] = 50;
   * assertEquals(undefined, a[-Infinity]);
   */
  a[1.5] = 10;
  assertEquals(undefined, a[1.5]);
  var nan = Math.sqrt(-1);
  a[nan] = 5;
  assertEquals(5, a[nan]);

  var x = 0;
  var y = -0;
  assertEquals(Infinity, 1/x);
  assertEquals(-Infinity, 1/y);
  a[x] = 5;
  a[y] = 27;
  assertEquals(27, a[x]);
  assertEquals(27, a[y]);
}

// Lars: I can't find anything in the spec that should prevent indices that are not array indices from working as usual.
// So I don't see why the test is as it is.
//TestTypedArraysWithIllegalIndices();

function TestTypedArraysWithIllegalIndicesStrict() {
  'use strict';
  var a = new Int32Array(100);

  a[-10] = 10;
  assertEquals(undefined, a[-10]);
  a["-10"] = 10;
  assertEquals(undefined, a["-10"]);

  var s = "    -10";
  a[s] = 10;
  assertEquals(10, a[s]);
  var s1 = "    -10   ";
  a[s] = 10;
  assertEquals(10, a[s]);

  a["-1e2"] = 10;
  assertEquals(10, a["-1e2"]);
  assertEquals(undefined, a[-1e2]);

  /* Chromium bug: 424619
   * a[-Infinity] = 50;
   * assertEquals(undefined, a[-Infinity]);
   */
  a[1.5] = 10;
  assertEquals(undefined, a[1.5]);
  var nan = Math.sqrt(-1);
  a[nan] = 5;
  assertEquals(5, a[nan]);

  var x = 0;
  var y = -0;
  assertEquals(Infinity, 1/x);
  assertEquals(-Infinity, 1/y);
  a[x] = 5;
  a[y] = 27;
  assertEquals(27, a[x]);
  assertEquals(27, a[y]);
}

// Lars: See above
//TestTypedArraysWithIllegalIndicesStrict();

// DataView
function TestDataViewConstructor() {
  var ab = new ArrayBuffer(256);

  var d1 = new DataView(ab, 1, 255);
  assertTrue(ArrayBuffer.isView(d1));
  assertSame(ab, d1.buffer);
  assertSame(1, d1.byteOffset);
  assertSame(255, d1.byteLength);

  var d2 = new DataView(ab, 2);
  assertSame(ab, d2.buffer);
  assertSame(2, d2.byteOffset);
  assertSame(254, d2.byteLength);

  var d3 = new DataView(ab);
  assertSame(ab, d3.buffer);
  assertSame(0, d3.byteOffset);
  assertSame(256, d3.byteLength);

  var d3a = new DataView(ab, 1, 0);
  assertSame(ab, d3a.buffer);
  assertSame(1, d3a.byteOffset);
  assertSame(0, d3a.byteLength);

  var d3b = new DataView(ab, 256, 0);
  assertSame(ab, d3b.buffer);
  assertSame(256, d3b.byteOffset);
  assertSame(0, d3b.byteLength);

  var d3c = new DataView(ab, 256);
  assertSame(ab, d3c.buffer);
  assertSame(256, d3c.byteOffset);
  assertSame(0, d3c.byteLength);

    /* This is wrong according to ecma 6 and should throw:

  var d4 = new DataView(ab, 1, Math.PI);
  assertSame(ab, d4.buffer);
  assertSame(1, d4.byteOffset);
  assertSame(3, d4.byteLength);
    */
  assertThrows(function() { new DataView(ab, Math.PI); }, RangeError);

  // error cases
  assertThrows(function() { new DataView(ab, -1); }, RangeError);
  assertThrows(function() { new DataView(ab, 1, -1); }, RangeError);
  assertThrows(function() { new DataView(); }, TypeError);
  assertThrows(function() { new DataView([]); }, TypeError);
  assertThrows(function() { new DataView(ab, 257); }, RangeError);
  assertThrows(function() { new DataView(ab, 1, 1024); }, RangeError);
}

TestDataViewConstructor();

function TestDataViewPropertyTypeChecks() {
  var a = new DataView(new ArrayBuffer(10));
  function CheckProperty(name) {
    var d = Object.getOwnPropertyDescriptor(DataView.prototype, name);
    var o = {}
    assertThrows(function() {d.get.call(o);}, TypeError);
    d.get.call(a); // shouldn't throw
  }

  CheckProperty("buffer");
  CheckProperty("byteOffset");
  CheckProperty("byteLength");
}

TestDataViewPropertyTypeChecks();

function TestDataGetterSetters() {
  var a = new DataView(new ArrayBuffer(16));
  function TestGetterSetter(size, name, value0, value1, delta1, delta2) {
    var getter = 'get' + name;
    var setter = 'set' + name;
    a[setter](0, value0);
    a[setter](size, value1);
    assertEquals(value0, a[getter](0), delta1);
    assertEquals(value1, a[getter](size), delta2);
  }

  TestGetterSetter(1, 'Int8', 111, -100);
  TestGetterSetter(2, 'Int16', 31111, -30000);
  TestGetterSetter(4, 'Int32', 2111111111, -2000000000);
  TestGetterSetter(1, 'Uint8', 111, 200);
  TestGetterSetter(2, 'Uint16', 31111, 60000);
  TestGetterSetter(4, 'Uint32', 2111111111, 4000000000);
  TestGetterSetter(4, 'Float32', Math.pow(10, 38), Math.pow(10, -38), Math.pow(10, 31), Math.pow(10, -45));
  TestGetterSetter(8, 'Float64', Math.pow(10, 308), Math.pow(10, -293), Math.pow(10, 293), Math.pow(10, -308));

  // Backword compatibility
  TestGetterSetter(1, 'UInt8', 111, 200);
  TestGetterSetter(2, 'UInt16', 31111, 60000);
  TestGetterSetter(4, 'UInt32', 2111111111, 4000000000);
}

TestDataGetterSetters();

// General tests for properties

// Test property attribute [[Enumerable]]
function TestEnumerable(func, obj) {
  function props(x) {
    var array = [];
    for (var p in x) array.push(p);
    return array.sort();
  }
  assertArrayEquals([], props(func));
  assertArrayEquals([], props(func.prototype));
  if (obj)
    assertArrayEquals([], props(obj));
}
TestEnumerable(ArrayBuffer, new ArrayBuffer());
for(i = 0; i < typedArrayConstructors.length; i++) {
  TestEnumerable(typedArrayConstructors[i]);
}
TestEnumerable(DataView, new DataView(new ArrayBuffer()));

// Test arbitrary properties on ArrayBuffer
function TestArbitrary(m) {
  function TestProperty(map, property, value) {
    map[property] = value;
    assertEquals(value, map[property]);
  }
  for (var i = 0; i < 20; i++) {
    TestProperty(m, 'key' + i, 'val' + i);
    TestProperty(m, 'foo' + i, 'bar' + i);
  }
}
TestArbitrary(new ArrayBuffer(256));
for(i = 0; i < typedArrayConstructors.length; i++) {
  TestArbitrary(new typedArrayConstructors[i](10));
}
TestArbitrary(new DataView(new ArrayBuffer(256)));

/* Lars: Not sure this is correct, as ECMA6 seems to allow calling the constructors as functions.
  */
// Test direct constructor call
//assertThrows(function() { ArrayBuffer(); }, TypeError);
//assertThrows(function() { DataView(new ArrayBuffer()); }, TypeError);