JSTests/stress/array-storage-length.js

'use strict';

function shouldBe(actual, expected) {
    if (actual !== expected)
        throw new Error('bad value: ' + actual);
}

var object = { a: 10 };
Object.defineProperties(object, {
    "0": {
        get: function() { return this.a; },
        set: function(x) { this.a = x; },
    },
});

var array = [ 0, 1, 2, 3, 4, 5 ];
ensureArrayStorage(array);

function testInBound(array)
{
    return array.length;
}
noInline(testInBound);
for (var i = 0; i < 1e5; ++i)
    shouldBe(testInBound(array), 6);

function testUncountable(array)
{
    return array.length;
}
noInline(testUncountable);
for (var i = 0; i < 1e5; ++i)
    shouldBe(testUncountable(array), 6);
array.length = 0xffffffff - 1;
for (var i = 0; i < 1e5; ++i)
    shouldBe(testUncountable(array), 0xffffffff - 1);


var slowPutArray = [ 0, 1, 2, 3, 4, 5 ];
ensureArrayStorage(slowPutArray);
slowPutArray.__proto__ = object;

function testSlowPutInBound(array)
{
    return array.length;
}
noInline(testSlowPutInBound);
for (var i = 0; i < 1e5; ++i)
    shouldBe(testSlowPutInBound(slowPutArray), 6);

function testSlowPutUncountable(array)
{
    return array.length;
}
noInline(testSlowPutUncountable);
for (var i = 0; i < 1e5; ++i)
    shouldBe(testSlowPutUncountable(slowPutArray), 6);
slowPutArray.length = 0xffffffff - 1;
for (var i = 0; i < 1e5; ++i)
    shouldBe(testSlowPutUncountable(slowPutArray), 0xffffffff - 1);