dfg-constant-fold-first-local-read-after-block-merge.js 1.9 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.
//
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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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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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

description(
"Tests that the DFG doesn't crash if we constant fold the first read of a local variable in a block that is the result of merging two blocks, where the first doesn't touch the local and the second reads it."
);

function foo(x, y) {
    var o = {};
    if (y == 5) {
        o.f = 42;
    }
    var z = o.f;
    if (x == 5) {
        if (y == 5) {
            return z;
        }
    }
}

function bar(x) {
    return foo(x, 5);
}

for (var i = 0; i < 200; ++i)
    shouldBe("bar(5)", "42");