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      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 
     31 namespace v8 {
     32 namespace 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 
     37 class 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