v8/test/mjsunit/harmony/dataview-accessors.js

// Copyright 2013 the V8 project authors. All rights reserved.
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// 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
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//       with the distribution.
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// These tests are adapted from Khronos DataView tests

var intArray1 =
  [0, 1, 2, 3, 100, 101, 102, 103, 128, 129, 130, 131, 252, 253, 254, 255];
var intArray2 =
  [31, 32, 33, 0, 1, 2, 3, 100, 101, 102, 103, 128, 129, 130, 131, 252,
    253, 254, 255];
var initialArray =
  [204, 204, 204, 204, 204, 204, 204, 204, 204, 204, 204, 204, 204,
    204, 204, 204];

var arayBuffer = null;
var view = null;
var viewStart = 0;
var viewLength = 0;

function getElementSize(func) {
  switch (func) {
    case "Int8":
    case "Uint8":
      return 1;
    case "Int16":
    case "Uint16":
      return 2;
    case "Int32":
    case "Uint32":
    case "Float32":
      return 4;
    case "Float64":
      return 8;
    default:
      assertUnreachable(func);
  }
}

function checkGet(func, index, expected, littleEndian) {
  function doGet() {
    if (littleEndian != undefined)
      return view["get" + func](index, littleEndian);
    else
      return view["get" + func](index);
  }
  if (index >=0 && index + getElementSize(func) - 1 < view.byteLength)
      assertSame(expected, doGet());
  else
      assertThrows(doGet, RangeError);
}

function checkSet(func, index, value, littleEndian) {
  function doSet() {
    if (littleEndian != undefined)
      view["set" + func](index, value, littleEndian);
    else
      view["set" + func](index, value);
  }
  if (index >= 0 &&
      index + getElementSize(func) - 1 < view.byteLength) {
    assertSame(undefined, doSet());
    checkGet(func, index, value, littleEndian);
  } else {
    assertThrows(doSet, RangeError);
  }
}

function test(isTestingGet, func, index, value, littleEndian) {
  if (isTestingGet)
    checkGet(func, index, value, littleEndian);
  else
    checkSet(func, index, value, littleEndian);
}

function createDataView(
    array, frontPaddingNum, littleEndian, start, length) {
  if (!littleEndian)
    array.reverse();
  var paddingArray = new Array(frontPaddingNum);
  arrayBuffer = (new Uint8Array(paddingArray.concat(array))).buffer;
  view = new DataView(arrayBuffer, viewStart, viewLength);
  if (!littleEndian)
    array.reverse(); // restore the array.
}

function runIntegerTestCases(isTestingGet, array, start, length) {
  createDataView(array, 0, true, start, length);

  test(isTestingGet, "Int8", 0, 0);
  test(isTestingGet, "Int8", undefined, 0);
  test(isTestingGet, "Int8", 8, -128);
  test(isTestingGet, "Int8", 15, -1);

  test(isTestingGet, "Uint8", 0, 0);
  test(isTestingGet, "Uint8", undefined, 0);
  test(isTestingGet, "Uint8", 8, 128);
  test(isTestingGet, "Uint8", 15, 255);

  // Little endian.
  test(isTestingGet, "Int16", 0, 256, true);
  test(isTestingGet, "Int16", undefined, 256, true);
  test(isTestingGet, "Int16", 5, 26213, true);
  test(isTestingGet, "Int16", 9, -32127, true);
  test(isTestingGet, "Int16", 14, -2, true);

  // Big endian.
  test(isTestingGet, "Int16", 0, 1);
  test(isTestingGet, "Int16", undefined, 1);
  test(isTestingGet, "Int16", 5, 25958);
  test(isTestingGet, "Int16", 9, -32382);
  test(isTestingGet, "Int16", 14, -257);

  // Little endian.
  test(isTestingGet, "Uint16", 0, 256, true);
  test(isTestingGet, "Uint16", undefined, 256, true);
  test(isTestingGet, "Uint16", 5, 26213, true);
  test(isTestingGet, "Uint16", 9, 33409, true);
  test(isTestingGet, "Uint16", 14, 65534, true);

  // Big endian.
  test(isTestingGet, "Uint16", 0, 1);
  test(isTestingGet, "Uint16", undefined, 1);
  test(isTestingGet, "Uint16", 5, 25958);
  test(isTestingGet, "Uint16", 9, 33154);
  test(isTestingGet, "Uint16", 14, 65279);

  // Little endian.
  test(isTestingGet, "Int32", 0, 50462976, true);
  test(isTestingGet, "Int32", undefined, 50462976, true);
  test(isTestingGet, "Int32", 3, 1717920771, true);
  test(isTestingGet, "Int32", 6, -2122291354, true);
  test(isTestingGet, "Int32", 9, -58490239, true);
  test(isTestingGet, "Int32", 12,-66052, true);

  // Big endian.
  test(isTestingGet, "Int32", 0, 66051);
  test(isTestingGet, "Int32", undefined, 66051);
  test(isTestingGet, "Int32", 3, 56911206);
  test(isTestingGet, "Int32", 6, 1718059137);
  test(isTestingGet, "Int32", 9, -2122152964);
  test(isTestingGet, "Int32", 12, -50462977);

  // Little endian.
  test(isTestingGet, "Uint32", 0, 50462976, true);
  test(isTestingGet, "Uint32", undefined, 50462976, true);
  test(isTestingGet, "Uint32", 3, 1717920771, true);
  test(isTestingGet, "Uint32", 6, 2172675942, true);
  test(isTestingGet, "Uint32", 9, 4236477057, true);
  test(isTestingGet, "Uint32", 12,4294901244, true);

  // Big endian.
  test(isTestingGet, "Uint32", 0, 66051);
  test(isTestingGet, "Uint32", undefined, 66051);
  test(isTestingGet, "Uint32", 3, 56911206);
  test(isTestingGet, "Uint32", 6, 1718059137);
  test(isTestingGet, "Uint32", 9, 2172814332);
  test(isTestingGet, "Uint32", 12, 4244504319);
}

function testFloat(isTestingGet, func, array, start, expected) {
  // Little endian.
  createDataView(array, 0, true, start);
  test(isTestingGet, func, 0, expected, true);
  test(isTestingGet, func, undefined, expected, true);
  createDataView(array, 3, true, start);
  test(isTestingGet, func, 3, expected, true);
  createDataView(array, 7, true, start);
  test(isTestingGet, func, 7, expected, true);
  createDataView(array, 10, true, start);
  test(isTestingGet, func, 10, expected, true);

  // Big endian.
  createDataView(array, 0, false);
  test(isTestingGet, func, 0, expected, false);
  test(isTestingGet, func, undefined, expected, false);
  createDataView(array, 3, false);
  test(isTestingGet, func, 3, expected, false);
  createDataView(array, 7, false);
  test(isTestingGet, func, 7, expected, false);
  createDataView(array, 10, false);
  test(isTestingGet, func, 10, expected, false);
}

function runFloatTestCases(isTestingGet, start) {
  testFloat(isTestingGet, "Float32",
    isTestingGet ? [0, 0, 32, 65] : initialArray, start, 10);

  testFloat(isTestingGet, "Float32",
    isTestingGet ? [164, 112, 157, 63] : initialArray,
      start, 1.2300000190734863);
  testFloat(isTestingGet, "Float32",
    isTestingGet ? [95, 53, 50, 199] : initialArray,
    start, -45621.37109375);
  testFloat(isTestingGet, "Float32",
    isTestingGet ? [255, 255, 255, 127] : initialArray,
    start, NaN);
  testFloat(isTestingGet, "Float32",
    isTestingGet ? [255, 255, 255, 255] : initialArray,
    start, -NaN);

  testFloat(isTestingGet, "Float64",
    isTestingGet ? [0, 0, 0, 0, 0, 0, 36, 64] : initialArray,
    start, 10);
  testFloat(isTestingGet, "Float64",
    isTestingGet ? [174, 71, 225, 122, 20, 174, 243, 63] : initialArray,
    start, 1.23);
  testFloat(isTestingGet, "Float64",
    isTestingGet ? [181, 55, 248, 30, 242, 179, 87, 193] : initialArray,
    start, -6213576.4839);
  testFloat(isTestingGet, "Float64",
    isTestingGet ? [255, 255, 255, 255, 255, 255, 255, 127] : initialArray,
    start, NaN);
  testFloat(isTestingGet, "Float64",
    isTestingGet ? [255, 255, 255, 255, 255, 255, 255, 255] : initialArray,
    start, -NaN);
}

function runNegativeIndexTests(isTestingGet) {
  createDataView(intArray1, 0, true, 0, 16);

  test(isTestingGet, "Int8", -1, 0);
  test(isTestingGet, "Int8", -2, 0);

  test(isTestingGet, "Uint8", -1, 0);
  test(isTestingGet, "Uint8", -2, 0);

  test(isTestingGet, "Int16", -1, 1);
  test(isTestingGet, "Int16", -2, 1);
  test(isTestingGet, "Int16", -3, 1);

  test(isTestingGet, "Uint16", -1, 1);
  test(isTestingGet, "Uint16", -2, 1);
  test(isTestingGet, "Uint16", -3, 1);

  test(isTestingGet, "Int32", -1, 66051);
  test(isTestingGet, "Int32", -3, 66051);
  test(isTestingGet, "Int32", -5, 66051);

  test(isTestingGet, "Uint32", -1, 66051);
  test(isTestingGet, "Uint32", -3, 66051);
  test(isTestingGet, "Uint32", -5, 66051);

  createDataView([0, 0, 0, 0, 0, 0, 0, 0], 0, true, 0, 8);

  test(isTestingGet, "Float32", -1, 0);
  test(isTestingGet, "Float32", -3, 0);
  test(isTestingGet, "Float32", -5, 0);

  test(isTestingGet, "Float64", -1, 0);
  test(isTestingGet, "Float64", -5, 0);
  test(isTestingGet, "Float64", -9, 0);
}


function TestGetters() {
  runIntegerTestCases(true, intArray1, 0, 16);
  runFloatTestCases(true, 0);

  runIntegerTestCases(true, intArray2, 3, 2);
  runFloatTestCases(true, 3);

  runNegativeIndexTests(true);
}

function TestSetters() {
  runIntegerTestCases(false, initialArray, 0, 16);
  runFloatTestCases(false);

  runIntegerTestCases(false, initialArray, 3, 2);
  runFloatTestCases(false, 7);

  runNegativeIndexTests(false);

}

TestGetters();
TestSetters();

function TestGeneralAccessors() {
  var a = new DataView(new ArrayBuffer(256));
  function CheckAccessor(name) {
    var f = a[name];
    assertThrows(function() { f(); }, TypeError);
    f.call(a, 0, 0); // should not throw
    assertThrows(function() { f.call({}, 0, 0); }, TypeError);
    assertThrows(function() { f.call(a); }, TypeError);
  }
  CheckAccessor("getUint8");
  CheckAccessor("setUint8");
  CheckAccessor("getInt8");
  CheckAccessor("setInt8");
  CheckAccessor("getUint16");
  CheckAccessor("setUint16");
  CheckAccessor("getInt16");
  CheckAccessor("setInt16");
  CheckAccessor("getUint32");
  CheckAccessor("setUint32");
  CheckAccessor("getInt32");
  CheckAccessor("setInt32");
  CheckAccessor("getFloat32");
  CheckAccessor("setFloat32");
  CheckAccessor("getFloat64");
  CheckAccessor("setFloat64");
}

TestGeneralAccessors();