path: root/deps/v8/test/mjsunit/harmony/typedarrays.js

// Copyright 2013 the V8 project authors. All rights reserved.
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// Flags: --harmony-typed-arrays

// ArrayBuffer

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

function TestArrayBufferCreation() {
  TestByteLength(1, 1);
  TestByteLength(256, 256);
  TestByteLength(-10, 0);
  TestByteLength(2.567, 2);
  TestByteLength(-2.567, 0);

  TestByteLength("abc", 0);

  TestByteLength(0, 0);

  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 slice = ab.slice(start, end);
  assertSame(expectedResultLen, slice.byteLength);
}

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(proto, elementSize, typicalElement) {
  var ab = new __ArrayBuffer(256*elementSize);

  var a1 = new proto(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 proto(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 proto(ab, 192*elementSize);
  assertSame(ab, a3.buffer);
  assertSame(64, a3.length);
  assertSame(64*elementSize, a3.byteLength);
  assertSame(192*elementSize, a3.byteOffset);

  var a4 = new proto(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]);
  }

  assertThrows(function () { new proto(ab, 256*elementSize); }, RangeError);

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

}

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);


// 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());
TestEnumerable(__Uint8Array);


// 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, i, 'val' + i);
    TestProperty(m, 'foo' + i, 'bar' + i);
  }
}
TestArbitrary(new __ArrayBuffer(256));

// Test direct constructor call
assertTrue(__ArrayBuffer() instanceof __ArrayBuffer);