dc61921bbf
Deletion of global properties puts 'the hole' in the global property cell and updates the property details in the property dictionary with the information that the property has been deleted. When setting global properties that have been deleted in generated code we just store the new value in the global property cell. This does not update the property details in the property dictionary. Therefore, it looks like the property is not there eventhough it was just reintroduced. Perform 'the hole' checks in generated code for global property stores and bail out of ICs and optimized code if storing to a property cell that contains 'the hole'. Review URL: http://codereview.chromium.org/6306014 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6508 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
49 lines
2.3 KiB
JavaScript
49 lines
2.3 KiB
JavaScript
// Copyright 2011 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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// Global properties declared with 'var' or 'function' should not be
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// deleteable.
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var tmp;
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assertFalse(delete tmp); // should be DONT_DELETE
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assertTrue("tmp" in this);
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function f() { return 1; }
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assertFalse(delete f); // should be DONT_DELETE
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assertEquals(1, f());
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// Check that deleting and reintroducing global variables works.
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// Get into the IC case for storing to a deletable global property.
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function introduce_x() { x = 42; }
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for (var i = 0; i < 10; i++) introduce_x();
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// Check that the property has been introduced.
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assertTrue(this.hasOwnProperty('x'));
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// Check that deletion works.
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delete x;
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assertFalse(this.hasOwnProperty('x'));
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// Check that reintroduction works.
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introduce_x();
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assertTrue(this.hasOwnProperty('x'));
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