Function Reverse

deps/v8/test/mjsunit/typedarray-growablesharedarraybuffer.js:3030–3082

(reverseHelper)

})();

function Reverse(reverseHelper) {
  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);

    const wholeArrayView = new ctor(gsab);
    function WriteData() {
      // Write some data into the array.
      for (let i = 0; i < wholeArrayView.length; ++i) {
        WriteToTypedArray(wholeArrayView, i, 2 * i);
      }
    }
    WriteData();

    // Orig. array: [0, 2, 4, 6]
    //              [0, 2, 4, 6] << fixedLength
    //                    [4, 6] << fixedLengthWithOffset
    //              [0, 2, 4, 6, ...] << lengthTracking
    //                    [4, 6, ...] << lengthTrackingWithOffset

    reverseHelper(fixedLength);
    assertEquals([6, 4, 2, 0], ToNumbers(wholeArrayView));
    reverseHelper(fixedLengthWithOffset);
    assertEquals([6, 4, 0, 2], ToNumbers(wholeArrayView));
    reverseHelper(lengthTracking);
    assertEquals([2, 0, 4, 6], ToNumbers(wholeArrayView));
    reverseHelper(lengthTrackingWithOffset);
    assertEquals([2, 0, 6, 4], ToNumbers(wholeArrayView));

    // Grow.
    gsab.grow(6 * ctor.BYTES_PER_ELEMENT);
    WriteData();

    // Orig. array: [0, 2, 4, 6, 8, 10]
    //              [0, 2, 4, 6] << fixedLength
    //                    [4, 6] << fixedLengthWithOffset
    //              [0, 2, 4, 6, 8, 10, ...] << lengthTracking
    //                    [4, 6, 8, 10, ...] << lengthTrackingWithOffset

    reverseHelper(fixedLength);
    assertEquals([6, 4, 2, 0, 8, 10], ToNumbers(wholeArrayView));
    reverseHelper(fixedLengthWithOffset);
    assertEquals([6, 4, 0, 2, 8, 10], ToNumbers(wholeArrayView));
    reverseHelper(lengthTracking);
    assertEquals([10, 8, 2, 0, 4, 6], ToNumbers(wholeArrayView));
    reverseHelper(lengthTrackingWithOffset);
    assertEquals([10, 8, 6, 4, 0, 2], ToNumbers(wholeArrayView));
  }
}
Reverse(TypedArrayReverseHelper);
Reverse(ArrayReverseHelper);