2ac04c11ac
This patch adds explicit overrides as this is now required when using "-Wall" with clang >= 3.5, the latter now part of the most recent XCode. The patch consequently removes "virtual" for those methods where "override" is added. The latter should be enough of an indication. As part of this patch, a few minor issues that clang >= 3.5 complains about are also resolved (unused methods and variables).
158 lines
4.8 KiB
C++
158 lines
4.8 KiB
C++
/*
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* Copyright (c) 2001-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Nathan Binkert
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*/
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/** @file
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* Disk Image Interfaces
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*/
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#ifndef __DISK_IMAGE_HH__
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#define __DISK_IMAGE_HH__
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#include <fstream>
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#include <unordered_map>
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#include "params/CowDiskImage.hh"
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#include "params/DiskImage.hh"
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#include "params/RawDiskImage.hh"
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#include "sim/sim_object.hh"
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#define SectorSize (512)
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/**
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* Basic interface for accessing a disk image.
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*/
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class DiskImage : public SimObject
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{
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protected:
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bool initialized;
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public:
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typedef DiskImageParams Params;
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DiskImage(const Params *p) : SimObject(p), initialized(false) {}
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virtual ~DiskImage() {}
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virtual std::streampos size() const = 0;
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virtual std::streampos read(uint8_t *data,
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std::streampos offset) const = 0;
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virtual std::streampos write(const uint8_t *data,
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std::streampos offset) = 0;
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};
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/**
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* Specialization for accessing a raw disk image
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*/
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class RawDiskImage : public DiskImage
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{
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protected:
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mutable std::fstream stream;
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std::string file;
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bool readonly;
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mutable std::streampos disk_size;
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public:
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typedef RawDiskImageParams Params;
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RawDiskImage(const Params *p);
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~RawDiskImage();
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void close();
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void open(const std::string &filename, bool rd_only = false);
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virtual std::streampos size() const;
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virtual std::streampos read(uint8_t *data, std::streampos offset) const;
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virtual std::streampos write(const uint8_t *data, std::streampos offset);
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};
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/**
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* Specialization for accessing a copy-on-write disk image layer.
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* A copy-on-write(COW) layer must be stacked on top of another disk
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* image layer this layer can be another CowDiskImage, or a
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* RawDiskImage.
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*
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* This object is designed to provide a mechanism for persistant
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* changes to a main disk image, or to provide a place for temporary
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* changes to the image to take place that later may be thrown away.
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*/
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class CowDiskImage : public DiskImage
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{
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public:
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static const uint32_t VersionMajor;
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static const uint32_t VersionMinor;
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protected:
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struct Sector {
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uint8_t data[SectorSize];
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};
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typedef std::unordered_map<uint64_t, Sector *> SectorTable;
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protected:
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std::string filename;
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DiskImage *child;
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SectorTable *table;
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public:
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typedef CowDiskImageParams Params;
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CowDiskImage(const Params *p);
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~CowDiskImage();
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void initSectorTable(int hash_size);
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bool open(const std::string &file);
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void save() const;
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void save(const std::string &file) const;
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void writeback();
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void serialize(CheckpointOut &cp) const override;
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void unserialize(CheckpointIn &cp) override;
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std::streampos size() const override;
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std::streampos read(uint8_t *data, std::streampos offset) const override;
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std::streampos write(const uint8_t *data, std::streampos offset) override;
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};
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void SafeRead(std::ifstream &stream, void *data, int count);
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template<class T>
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void SafeRead(std::ifstream &stream, T &data);
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template<class T>
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void SafeReadSwap(std::ifstream &stream, T &data);
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void SafeWrite(std::ofstream &stream, const void *data, int count);
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template<class T>
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void SafeWrite(std::ofstream &stream, const T &data);
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template<class T>
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void SafeWriteSwap(std::ofstream &stream, const T &data);
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#endif // __DISK_IMAGE_HH__
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