55e924c595
This happens when a map A with no descriptors in fast_holey_elements mode first gets some properties, making it share descriptor arrays with a map B to which it transitions. Then map A transitions elements kind to dictionary_elements in map C. C stores the empty_descriptor_array in its own transition array. When adding a property to C, C transitions to D and shares the descriptors. If D dies, a CNLT clears the transition array of C, making the descriptor array of A (and thus also of B) shine through. If a property is now added to an object in state C, it'll inherit all the properties of A (and B). If those properties had high field indices, we do not have a large enough backing store for the single newly added property, and we'll write out of bounds. BUG=chromium:151749 Review URL: https://chromiumcodereview.appspot.com/11017054 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12687 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
44 lines
1.8 KiB
JavaScript
44 lines
1.8 KiB
JavaScript
// Copyright 2012 the V8 project authors. All rights reserved.
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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 are
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// met:
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//
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// * 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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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// 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
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Flags: --expose-gc
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var a = JSON.parse('{"b":1,"c":2,"d":3,"e":4}');
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var b = JSON.parse('{"12040200":1, "a":2, "b":2}');
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var c = JSON.parse('{"24050300":1}');
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b = null;
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gc();
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gc();
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c.a1 = 2;
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c.a2 = 2;
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c.a3 = 2;
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c.a4 = 2;
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c.a5 = 2;
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c.a6 = 2;
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c.a7 = 2;
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c.a8 = 2;
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