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61 lines
2.4 KiB
61 lines
2.4 KiB
12 years ago
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// 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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12 years ago
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// Flags: --expose-gc
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12 years ago
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12 years ago
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// Create a transition tree A (no descriptors) -> B (descriptor for a) -> C
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// (descriptor for a and c), that all share the descriptor array [a,c]. C is the
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// owner of the descriptor array.
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var o = {};
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o.a = 1;
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o.c = 2;
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// Add a transition B -> D where D has its own descriptor array [a,b] where b is
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// a constant function.
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var o1 = {};
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o1.a = 1;
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// Install an enumeration cache in the descriptor array [a,c] at map B.
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for (var x in o1) { }
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o1.b = function() { return 1; };
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// Return ownership of the descriptor array [a,c] to B and trim it to [a].
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o = null;
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gc();
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// Convert the transition B -> D into a transition to B -> E so that E uses the
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// instance descriptors [a,b] with b being a field.
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var o2 = {};
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o2.a = 1;
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o2.b = 10;
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// Create an object with map B and iterate over it.
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var o3 = {};
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o3.a = 1;
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for (var y in o3) { }
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