testArrayBufferSlice.js

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function testSlice() {

    function test(subBuf, starts, size) {

        var byteLength = size;

        var subBuffer = eval(subBuf);

        var subArray = new Int8Array(subBuffer);

        assertEq(subBuffer.byteLength, byteLength);

        for (var i = 0; i < size; ++i)

            assertEq(starts + i, subArray[i]);

    var buffer = new ArrayBuffer(32);

    var array = new Int8Array(buffer);

    for (var i = 0; i < 32; ++i)

        array[i] = i;

    test("buffer.slice(0)", 0, 32);

    test("buffer.slice(16)", 16, 16);

    test("buffer.slice(24)", 24, 8);

    test("buffer.slice(32)", 32, 0);

    test("buffer.slice(40)", 32, 0);

    test("buffer.slice(80)", 32, 0);

    test("buffer.slice(-8)", 24, 8);

    test("buffer.slice(-16)", 16, 16);

    test("buffer.slice(-24)", 8, 24);

    test("buffer.slice(-32)", 0, 32);

    test("buffer.slice(-40)", 0, 32);

    test("buffer.slice(-80)", 0, 32);

    test("buffer.slice(0, 32)", 0, 32);

    test("buffer.slice(0, 16)", 0, 16);

    test("buffer.slice(8, 24)", 8, 16);

    test("buffer.slice(16, 32)", 16, 16);

    test("buffer.slice(24, 16)", 24, 0);

    test("buffer.slice(16, -8)", 16, 8);

    test("buffer.slice(-20, 30)", 12, 18);

    test("buffer.slice(-8, -20)", 24, 0);

    test("buffer.slice(-20, -8)", 12, 12);

    test("buffer.slice(-40, 16)", 0, 16);

    test("buffer.slice(-40, 40)", 0, 32);

    gczeal(7, 100000);

    var nurseryBuf = new ArrayBuffer(32);

    var arr = new Int8Array(nurseryBuf);

    arr[0] = 77;

    // tenure nurseryBuf during the slice operation

    nurseryBuf.slice; // Creates an object

    schedulegc(1);

    var newbuf = nurseryBuf.slice(0);

    var arr2 = new Int8Array(newbuf);

    assertEq(arr2[0], 77);

testSlice();