xref: /gem5/src/mem/ruby/common/DataBlock.hh

/*
 * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
 * 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 the copyright holders 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.
 */

#ifndef DATABLOCK_H
#define DATABLOCK_H

#include "mem/ruby/common/Global.hh"
#include "mem/ruby/system/System.hh"
#include "mem/gems_common/Vector.hh"

class DataBlock {
 public:
  // Constructors
  DataBlock() {alloc();}
  DataBlock(const DataBlock & cp) {
    m_data = new uint8[RubySystem::getBlockSizeBytes()];
    memcpy(m_data, cp.m_data, RubySystem::getBlockSizeBytes());
    m_alloc = true;
  }

  // Destructor
  ~DataBlock() { if(m_alloc) delete [] m_data;}

  DataBlock& operator=(const DataBlock& obj);

  // Public Methods
  void assign(uint8* data);

  void clear();
  uint8 getByte(int whichByte) const;
  const uint8* getData(int offset, int len) const;
  void setByte(int whichByte, uint8 data);
  void setData(uint8* data, int offset, int len);
  void copyPartial(const DataBlock & dblk, int offset, int len);
  bool equal(const DataBlock& obj) const;
  void print(ostream& out) const;

private:
  void alloc();
  // Data Members (m_ prefix)
  uint8* m_data;
  bool m_alloc;
};

// Output operator declaration
ostream& operator<<(ostream& out, const DataBlock& obj);

bool operator==(const DataBlock& obj1, const DataBlock& obj2);

// inline functions for speed

inline
void DataBlock::assign(uint8* data)
{
  delete [] m_data;
  m_data = data;
  m_alloc = false;
}

inline
void DataBlock::alloc()
{
  m_data = new uint8[RubySystem::getBlockSizeBytes()];
  m_alloc = true;
  clear();
}

inline
void DataBlock::clear()
{
  memset(m_data, 0, RubySystem::getBlockSizeBytes());
}

inline
bool DataBlock::equal(const DataBlock& obj) const
{
  return !memcmp(m_data, obj.m_data, RubySystem::getBlockSizeBytes());
}

inline
void DataBlock::print(ostream& out) const
{
  int size = RubySystem::getBlockSizeBytes();
  out << "[ ";
  for (int i = 0; i < size; i+=4) {
    out << hex << *((uint32*)(&(m_data[i]))) << " ";
  }
  out << dec << "]" << flush;
}

inline
uint8 DataBlock::getByte(int whichByte) const
{
  return m_data[whichByte];
}

inline
const uint8* DataBlock::getData(int offset, int len) const
{
  assert(offset + len <= RubySystem::getBlockSizeBytes());
  return &m_data[offset];
}

inline
void DataBlock::setByte(int whichByte, uint8 data)
{
    m_data[whichByte] = data;
}

inline
void DataBlock::setData(uint8* data, int offset, int len)
{
  assert(offset + len <= RubySystem::getBlockSizeBytes());
  memcpy(&m_data[offset], data, len);
}

inline
void DataBlock::copyPartial(const DataBlock & dblk, int offset, int len)
{
  setData(&dblk.m_data[offset], offset, len);
}

// ******************* Definitions *******************

// Output operator definition
extern inline
ostream& operator<<(ostream& out, const DataBlock& obj)
{
  obj.print(out);
  out << flush;
  return out;
}

extern inline
bool operator==(const DataBlock& obj1,const DataBlock& obj2)
{
  return (obj1.equal(obj2));
}

#endif //DATABLOCK_H