Function TestCopyWithin

deps/v8/test/mjsunit/typedarray-growablesharedarraybuffer.js:965–1045

(helper)

})();

function TestCopyWithin(helper) {
  for (let ctor of ctors) {
    const gsab = CreateGrowableSharedArrayBuffer(4 * ctor.BYTES_PER_ELEMENT,
                                                 8 * ctor.BYTES_PER_ELEMENT);
    const fixedLength = new ctor(gsab, 0, 4);
    const fixedLengthWithOffset = new ctor(gsab, 2 * ctor.BYTES_PER_ELEMENT, 2);
    const lengthTracking = new ctor(gsab, 0);
    const lengthTrackingWithOffset = new ctor(gsab, 2 * ctor.BYTES_PER_ELEMENT);

    // Write some data into the array.
    const taWrite = new ctor(gsab);
    for (let i = 0; i < 4; ++i) {
      WriteToTypedArray(taWrite, i, i);
    }

    // Orig. array: [0, 1, 2, 3]
    //              [0, 1, 2, 3] << fixedLength
    //                    [2, 3] << fixedLengthWithOffset
    //              [0, 1, 2, 3, ...] << lengthTracking
    //                    [2, 3, ...] << lengthTrackingWithOffset

    helper(fixedLength, 0, 2);
    assertEquals([2, 3, 2, 3], ToNumbers(fixedLength));

    for (let i = 0; i < 4; ++i) {
      WriteToTypedArray(taWrite, i, i);
    }

    helper(fixedLengthWithOffset, 0, 1);
    assertEquals([3, 3], ToNumbers(fixedLengthWithOffset));

    for (let i = 0; i < 4; ++i) {
      WriteToTypedArray(taWrite, i, i);
    }

    helper(lengthTracking, 0, 2);
    assertEquals([2, 3, 2, 3], ToNumbers(lengthTracking));

    helper(lengthTrackingWithOffset, 0, 1);
    assertEquals([3, 3], ToNumbers(lengthTrackingWithOffset));

    gsab.grow(6 * ctor.BYTES_PER_ELEMENT);
    for (let i = 0; i < 6; ++i) {
      WriteToTypedArray(taWrite, i, i);
    }

    // Orig. array: [0, 1, 2, 3, 4, 5]
    //              [0, 1, 2, 3] << fixedLength
    //                    [2, 3] << fixedLengthWithOffset
    //              [0, 1, 2, 3, 4, 5, ...] << lengthTracking
    //                    [2, 3, 4, 5, ...] << lengthTrackingWithOffset

    helper(fixedLength, 0, 2);
    assertEquals([2, 3, 2, 3], ToNumbers(fixedLength));

    for (let i = 0; i < 6; ++i) {
      WriteToTypedArray(taWrite, i, i);
    }