v8/test/webkit/dfg-array-pop-side-effects.js

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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
// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
description(
"Tests that ArrayPop is known to the DFG to be a side effect."
);
function foo(a, b) {
var result = a.f;
result += b.pop();
result += a.g;
return result;
}
var ouches = 0;
for (var i = 0; i < 200; ++i) {
var a = {f:1, g:2};
var b = [];
var expected;
if (i < 150) {
// Ensure that we always transition the array's structure to one that indicates
// that we have array storage.
b.__defineGetter__("0", function() {
testFailed("Should never get here");
});
b.length = 0;
b[0] = 42;
expected = "45";
} else {
b.__defineGetter__("0", function() {
debug("Ouch!");
ouches++;
delete a.g;
a.h = 43;
return 5;
});
expected = "0/0";
}
shouldBe("foo(a, b)", expected);
}
shouldBe("ouches", "50");