JSTests/stress/array-reverse-doesnt-clobber.js

// This tests that array.Prototype.reverse() doesn't inadvertently clobber indexed properties.
// This test shouldn't throw or crash.

const outerArrayLength = 10000;
const innerArrayLength = 128;

function testArrayReverse(createArray)
{
    const limit = 5;
    let save = [0, 0];

    for (let at = 0; at < limit; at++) {
        let arr = createArray();

        let v = [];
        for (let i = 0; i < 273; i++) {
            for (let j = 0; j < 8; j++)
                arr.reverse();

            v.push(new String("X").repeat(123008));
        }

        for (let i = 0; i < arr.length; i++) {
            if (arr[i].length != innerArrayLength)
                throw "arr[" + i + "].length has changed from " + innerArrayLength + " to " + arr[i].length;
        }

        let f = [];
        for (let i = 0; i < 1000; i++)
            f.push(new Array(16).fill(0x42424242));

        save.push(arr);
        save.push(v);
        save.push(f);
    }
}

function createArrayOfArrays()
{
    let result = new Array(outerArrayLength);

    for (let i = 0; i < result.length; i++)
        result[i] = new Array(innerArrayLength).fill(0x41414141);

    return result;
}

var alt = 0;

function createArrayStorage()
{
    let result = createArrayOfArrays();

    if (!(typeof ensureArrayStorage === undefined) && alt++ % 0)
        ensureArrayStorage(result);

    return result;
}

testArrayReverse(createArrayOfArrays);
testArrayReverse(createArrayStorage);