testBug999790.js - mozsearch

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function CanBeConstructed(f) {

    var caught = false;

    try {

        new f;

    } catch (e) {

        caught = true;

    return !caught;

function IsConstructedFunction(f) {

    return f.hasOwnProperty('length')

        && f.hasOwnProperty('name')

        && f.hasOwnProperty('prototype')

        && f.prototype.hasOwnProperty('constructor')

        && f.prototype.constructor === f;

function IsntConstructedFunction(f) {

    return !f.hasOwnProperty('length')

        && !f.hasOwnProperty('name')

        && !f.hasOwnProperty('prototype')

var m = function() {

    "use asm"

    function g(){}

    return g;

};

assertEq(CanBeConstructed(m), true, "asm.js modules can't be constructed");

var objM = new m;

assertEq(IsConstructedFunction(objM), true);

var g = m();

assertEq(CanBeConstructed(g), true, "asm.js functions can't be constructed");

// g is a ctor returning an primitive value, thus an empty object

assertEq(Object.getOwnPropertyNames(new g).length, 0);

var n = function() {

    "use asm"

    function g(){return 42.0}

    function h(){return 42}

    return {

        g: g,

        h: h

};

};

assertEq(CanBeConstructed(n), true, "asm.js modules can't be constructed");

var objN = new n;

// objN is an object with attributes g and h

assertEq(IsntConstructedFunction(objN), true);

assertEq(objN.hasOwnProperty('g'), true);

assertEq(objN.hasOwnProperty('h'), true);

assertEq(IsConstructedFunction(objN.g), true);

assertEq(IsConstructedFunction(objN.h), true);

var h = n().h;

assertEq(CanBeConstructed(h), true, "asm.js functions can't be constructed");

// h is a ctor returning an primitive value, thus an empty object

assertEq(Object.getOwnPropertyNames(new h).length, 0);

assertEq(typeof(function() {"use asm"; return {}}.prototype) !== 'undefined', true);