1  /*
 2   * Copyright (C) 2008 Apple Inc. All rights reserved.
 3   * Copyright (C) 2008 Cameron Zwarich <cwzwarich@uwaterloo.ca>
 4   *
 5   * Redistribution and use in source and binary forms, with or without
 6   * modification, are permitted provided that the following conditions
 7   * are met:
 8   *
 9   * 1.  Redistributions of source code must retain the above copyright
10   *     notice, this list of conditions and the following disclaimer.
11   * 2.  Redistributions in binary form must reproduce the above copyright
12   *     notice, this list of conditions and the following disclaimer in the
13   *     documentation and/or other materials provided with the distribution.
14   * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
15   *     its contributors may be used to endorse or promote products derived
16   *     from this software without specific prior written permission.
17   *
18   * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
19   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21   * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
22   * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28   */
29  
30  #include "config.h"
31  #include "JumpTable.h"
32  
33  #include <wtf/text/StringHash.h>
34  
35  namespace JSC {
36  
37  int32_t SimpleJumpTable::offsetForValue(int32_t value, int32_t defaultOffset)
38  {
39      if (value >= min && static_cast<uint32_t>(value - min) < branchOffsets.size()) {
40          int32_t offset = branchOffsets[value - min];
41          if (offset)
42              return offset;
43      }
44      return defaultOffset;        
45  }
46  
47  } // namespace JSC