53 lines
2.7 KiB
JavaScript
53 lines
2.7 KiB
JavaScript
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// Copyright 2013 the V8 project authors. All rights reserved.
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// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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// 1. Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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description(
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"Tests that constant folding an access to an uncaptured variable that is captured later in the same basic block doesn't lead to assertion failures."
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);
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var thingy = 456;
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function bar() {
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return thingy;
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}
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function baz(a) {
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if (a) // Here we have an access to r2. The bug was concerned with our assertions thinking that this access was invalid.
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return arguments; // Force r2 (see below) to get captured.
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}
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function foo(p, a) {
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// The temporary variable corresponding to the 'bar' callee coming out of the ternary expression will be allocated by
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// the bytecompiler to some virtual register, say r2. This expression is engineered so that (1) the virtual register
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// chosen for the callee here is the same as the one that will be chosen for the first non-this argument below,
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// (2) that the callee ends up being constant but requires CFA to prove it, and (3) that we actually load that constant
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// using GetLocal (which happens because of the CheckFunction to check the callee).
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var x = (a + 1) + (p ? bar : bar)();
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// The temporary variable corresponding to the first non-this argument to baz will be allocated to the same virtual
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// register (i.e. r2).
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return baz(x);
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}
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for (var i = 0; i < 100; ++i)
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shouldBe("foo(true, 5)[0]", "462");
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