afc15bb48f
We need to be careful to check global property cells for the property encountered during lookup. Therefore, the ICs have to be specific to the name of the property if global objects are involved. In principle, this means that we could get a large number of monomorphic ICs for the same map if there is a global object in the prototype chain. However, since this is only done for normal load ICs and not for keyed load ICs I do not expect this to be a problem. I will experiment with it once this goes in. BUG=675 Review URL: http://codereview.chromium.org/1559033 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4426 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
62 lines
2.3 KiB
JavaScript
62 lines
2.3 KiB
JavaScript
// Copyright 2010 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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// Regression test for http://code.google.com/p/v8/issues/detail?id=675.
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//
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// Test that load ICs for nonexistent properties check global
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// property cells.
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function f() { return this.x; }
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// Initialize IC for nonexistent x property on global object.
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f();
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f();
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// Assign to global property cell for x.
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this.x = 23;
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// Check that we bail out from the IC.
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assertEquals(23, f());
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// Same test, but test that the global property cell is also checked
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// if the global object is the last object in the prototype chain for
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// the load.
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this.__proto__ = null;
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function g() { return this.y; }
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// Initialize IC.
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g();
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g();
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// Update global property cell.
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this.y = 42;
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// Check that IC bails out.
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assertEquals(42, g());
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