61 lines
2.4 KiB
JavaScript
61 lines
2.4 KiB
JavaScript
|
// Copyright 2012 the V8 project authors. All rights reserved.
|
||
|
|
// Redistribution and use in source and binary forms, with or without
|
||
|
|
// modification, are permitted provided that the following conditions are
|
||
|
|
// met:
|
||
|
|
//
|
||
|
|
// * Redistributions of source code must retain the above copyright
|
||
|
|
// notice, this list of conditions and the following disclaimer.
|
||
|
|
// * 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.
|
||
|
|
// * Neither the name of Google Inc. nor the names of its
|
||
|
|
// contributors may be used to endorse or promote products derived
|
||
|
|
// from this software without specific prior written permission.
|
||
|
|
//
|
||
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
|
||
|
|
// OWNER OR 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.
|
||
|
|
|
||
|
|
// Flags: --expose-gc
|
||
|
|
|
||
|
|
// Create a transition tree A (no descriptors) -> B (descriptor for a) -> C
|
||
|
|
// (descriptor for a and c), that all share the descriptor array [a,c]. C is the
|
||
|
|
// owner of the descriptor array.
|
||
|
|
var o = {};
|
||
|
|
o.a = 1;
|
||
|
|
o.c = 2;
|
||
|
|
|
||
|
|
// Add a transition B -> D where D has its own descriptor array [a,b] where b is
|
||
|
|
// a constant function.
|
||
|
|
var o1 = {};
|
||
|
|
o1.a = 1;
|
||
|
|
|
||
|
|
// Install an enumeration cache in the descriptor array [a,c] at map B.
|
||
|
|
for (var x in o1) { }
|
||
|
|
o1.b = function() { return 1; };
|
||
|
|
|
||
|
|
// Return ownership of the descriptor array [a,c] to B and trim it to [a].
|
||
|
|
o = null;
|
||
|
|
gc();
|
||
|
|
|
||
|
|
// Convert the transition B -> D into a transition to B -> E so that E uses the
|
||
|
|
// instance descriptors [a,b] with b being a field.
|
||
|
|
var o2 = {};
|
||
|
|
o2.a = 1;
|
||
|
|
o2.b = 10;
|
||
|
|
|
||
|
|
// Create an object with map B and iterate over it.
|
||
|
|
var o3 = {};
|
||
|
|
o3.a = 1;
|
||
|
|
|
||
|
|
for (var y in o3) { }
|