test/Closures/invalcachedscope.js

//-------------------------------------------------------------------------------------------------------
// Copyright (C) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
//-------------------------------------------------------------------------------------------------------

// "outer" is called in a loop but can't re-use its scope because "inner" escapes.
// The escape isn't detected with /forcedeferparse, because inner2 isn't visible to the
// byte code gen.
// So executing inner2 must invalidate the cache.
// If the cache is not invalidated, the call to escaped[1] will get the value of "x"
// from the scope cached when we executed escaped[0].
function outer() {
    var x = "yes!";
    function inner() {
        eval('WScript.Echo(x); x = "no!"');
    }
    function inner2() {
        return inner;
    }
    return inner2();
}

var escaped = [2];
for (var i = 0; i < 2; i++) {
    escaped[i] = outer();
}
for (i = 0; i < escaped.length; i++) {
    escaped[i]();
}

// As above, but the escape of "inner" is hidden by eval.
// Cache must be invalidated by the runtime when it does GetPropertyScoped.
function outer2() {
    var x = "yes!";
    function inner() {
        eval('WScript.Echo(x); x = "no!"');
    }
    function inner2() {
        return eval('inner');
    }
    return inner2();
}

for (i = 0; i < 2; i++) {
    escaped[i] = outer2();
}
for (i = 0; i < escaped.length; i++) {
    escaped[i]();
}