1 // Copyright 2009 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided
11 // with the distribution.
12 // * Neither the name of Google Inc. nor the names of its
13 // contributors may be used to endorse or promote products derived
14 // from this software without specific prior written permission.
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 // According to ECMA-262, sections 8.6.2.2 and 8.6.2.3 you're not
29 // allowed to override read-only properties, not even if the read-only
30 // property is in the prototype chain.
32 // However, for compatibility with WebKit/JSC, we allow the overriding
33 // of read-only properties in prototype chains.
38 var original_number_max = Number.MAX_VALUE;
40 // Assignment to a property which does not exist on the object itself,
41 // but is read-only in a prototype does not take effect.
43 assertEquals(original_number_max, f.MAX_VALUE);
45 assertEquals(original_number_max, f.MAX_VALUE);
47 // Assignment to a property which does not exist on the object itself,
48 // but is read-only in a prototype does not take effect.
53 assertEquals(original_number_max, f.MAX_VALUE);
55 // Assignment to read-only property on the object itself is ignored.
56 Number.MAX_VALUE = 42;
57 assertEquals(original_number_max, Number.MAX_VALUE);
59 // G should be read-only on the global object and the assignment is
63 assertTrue(typeof G === 'function');