regress-155924.js revision a7e24c173cf37484693b9abb38e494fa7bd7baeb 
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
4// met:
5//
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.
15//
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.
27
28// A HeapNumber with certain bits in the mantissa of the floating point
29// value should not be able to masquerade as a string in a keyed lookup
30// inline cache stub.  See http://codereview.chromium.org/155924.
31
32A = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ];
33
34function foo() {
35  x = 1 << 26;
36  x = x * x;
37  // The following floating-point heap number has a second word similar
38  // to that of the string "5":
39  // 2^52 + index << cached_index_shift + cached_index_tag
40  x = x + (5 << 2) + (1 << 1);
41  return A[x];
42}
43
44assertEquals(undefined, foo(), "First lookup A[bad_float]");
45assertEquals(undefined, foo(), "Second lookup A[bad_float]");
46assertEquals(undefined, foo(), "Third lookup A[bad_float]");
47