xref: /external/chromium_org/v8/test/mjsunit/regress/regress-155924.js

// Copyright 2009 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.

// A HeapNumber with certain bits in the mantissa of the floating point
// value should not be able to masquerade as a string in a keyed lookup
// inline cache stub.  See http://codereview.chromium.org/155924.

A = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ];

function foo() {
  x = 1 << 26;
  x = x * x;
  // The following floating-point heap number has a second word similar
  // to that of the string "5":
  // 2^52 + index << cached_index_shift + cached_index_tag
  x = x + (5 << 2) + (1 << 1);
  return A[x];
}

assertEquals(undefined, foo(), "First lookup A[bad_float]");
assertEquals(undefined, foo(), "Second lookup A[bad_float]");
assertEquals(undefined, foo(), "Third lookup A[bad_float]");