1// Copyright 2011 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#ifndef V8_MEMORY_H_
29#define V8_MEMORY_H_
30
31namespace v8 {
32namespace internal {
33
34// Memory provides an interface to 'raw' memory. It encapsulates the casts
35// that typically are needed when incompatible pointer types are used.
36
37class Memory {
38 public:
39  static uint8_t& uint8_at(Address addr) {
40    return *reinterpret_cast<uint8_t*>(addr);
41  }
42
43  static uint16_t& uint16_at(Address addr)  {
44    return *reinterpret_cast<uint16_t*>(addr);
45  }
46
47  static uint32_t& uint32_at(Address addr)  {
48    return *reinterpret_cast<uint32_t*>(addr);
49  }
50
51  static int32_t& int32_at(Address addr)  {
52    return *reinterpret_cast<int32_t*>(addr);
53  }
54
55  static uint64_t& uint64_at(Address addr)  {
56    return *reinterpret_cast<uint64_t*>(addr);
57  }
58
59  static int& int_at(Address addr)  {
60    return *reinterpret_cast<int*>(addr);
61  }
62
63  static unsigned& unsigned_at(Address addr) {
64    return *reinterpret_cast<unsigned*>(addr);
65  }
66
67  static double& double_at(Address addr)  {
68    return *reinterpret_cast<double*>(addr);
69  }
70
71  static Address& Address_at(Address addr)  {
72    return *reinterpret_cast<Address*>(addr);
73  }
74
75  static Object*& Object_at(Address addr)  {
76    return *reinterpret_cast<Object**>(addr);
77  }
78
79  static Handle<Object>& Object_Handle_at(Address addr)  {
80    return *reinterpret_cast<Handle<Object>*>(addr);
81  }
82};
83
84} }  // namespace v8::internal
85
86#endif  // V8_MEMORY_H_
87