dfg-int32-to-double-on-set-local-and-sometimes-exit.js 2.33 KB
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// Copyright 2013 the V8 project authors. All rights reserved.
// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1.  Redistributions of source code must retain the above copyright
//     notice, this list of conditions and the following disclaimer.
// 2.  Redistributions in binary form must reproduce the above copyright
//     notice, this list of conditions and the following disclaimer in the
//     documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (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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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

description(
"Tests that an Int32ToDouble placed on a SetLocal does a forward exit, and works right even when the relevant variable is actually predicted numeric."
);

var counter = 0;

function checkpoint(text) {
    debug("Checkpoint: " + text);
    counter++;
}

function func1() {
    checkpoint("a");
    a = Date.now() + Date.now() + Date.now() + Date.now() + Date.now() + Date.now();
    checkpoint("b");
    if (counter < 1100)
        return 0;
}
function func2() {
    checkpoint("c");
    return Date.now() + Date.now() + Date.now() + Date.now() + Date.now() + Date.now();
}

function func3(s) {
    checkpoint("1");
    s = func1(); // The bug is that this function will be called twice, if our Int32ToDouble hoisting does a backward speculation.
    checkpoint("2");
    s = func2();
    checkpoint("3");
    return s;
}

function test() {
    return func3(1);
}


for (var i=0; i < 200; i++) {
    test();
}

shouldBe("counter", "1200");