JSTests/stress/dataview-jit-neuter.js

"use strict";

function assert(b) {
    if (!b)
        throw new Error("Bad!");
}

function getIsLittleEndian() {
    let ab = new ArrayBuffer(2);
    let ta = new Int16Array(ab);
    ta[0] = 0x0102;
    let dv = new DataView(ab);
    return dv.getInt16(0, true) === 0x0102;
}

let isLittleEndian = getIsLittleEndian();

function adjustForEndianess(value) {
    if (isLittleEndian)
        return value;

    let ab = new ArrayBuffer(4);
    let ta = new Uint32Array(ab);
    ta[0] = value;
    let dv = new DataView(ab);
    return dv.getUint32(0, true);
}

function test() {
    function load(o, i) {
        return o.getUint8(i);
    }
    noInline(load);

    let ab = new ArrayBuffer(4);
    let ta = new Uint32Array(ab);
    ta[0] = adjustForEndianess(0xa070fa01);
    let dv = new DataView(ab);

    for (let i = 0; i < 1000; ++i) {
        assert(load(dv, 0) === 0x01);
    }

    transferArrayBuffer(ab);
    let e = null;
    try {
        load(dv, 0);
    } catch(err) {
        e = err;
    }
    assert(e instanceof TypeError);
}
test();


function test2() {
    function load(o, i) {
        return o.getUint8(i);
    }
    noInline(load);

    let ab = new ArrayBuffer(4);
    let ta = new Uint32Array(ab);
    ta[0] = adjustForEndianess(0xa070fa01);
    let dv = new DataView(ab);

    for (let i = 0; i < 10000; ++i) {
        assert(load(dv, 0) === 0x01);
    }

    transferArrayBuffer(ab);
    let e = null;
    try {
        load(dv, 0);
    } catch(err) {
        e = err;
    }
    assert(e instanceof TypeError);
}
test2();