node/deps/v8/test/webkit/dfg-proto-access-inline-osr-exit.js

// Copyright 2013 the V8 project authors. All rights reserved.
// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
//
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// modification, are permitted provided that the following conditions
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// 2.  Redistributions in binary form must reproduce the above copyright
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//
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// DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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description(
"Tests what happens when we OSR exit on an inlined prototype access due to a change in the prototype chain."
);

function foo(o) {
    return o.g.f;
}

function Thingy() {
}

var myProto = {f:42};

Thingy.prototype = myProto;

for (var i = 0; i < 200; ++i) {
    if (i == 150)
        myProto.g = 67;
    shouldBe("foo({g:new Thingy()})", "42");
}