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//===- MemoryObject.h - Abstract memory interface ---------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_MEMORYOBJECT_H
#define LLVM_SUPPORT_MEMORYOBJECT_H
#include "llvm/Support/DataTypes.h"
namespace llvm {
/// MemoryObject - Abstract base class for contiguous addressable memory.
/// Necessary for cases in which the memory is in another process, in a
/// file, or on a remote machine.
/// All size and offset parameters are uint64_ts, to allow 32-bit processes
/// access to 64-bit address spaces.
class MemoryObject {
public:
/// Destructor - Override as necessary.
virtual ~MemoryObject();
/// getBase - Returns the lowest valid address in the region.
///
/// @result - The lowest valid address.
virtual uint64_t getBase() const = 0;
/// getExtent - Returns the size of the region in bytes. (The region is
/// contiguous, so the highest valid address of the region
/// is getBase() + getExtent() - 1).
///
/// @result - The size of the region.
virtual uint64_t getExtent() const = 0;
/// readByte - Tries to read a single byte from the region.
///
/// @param address - The address of the byte, in the same space as getBase().
/// @param ptr - A pointer to a byte to be filled in. Must be non-NULL.
/// @result - 0 if successful; -1 if not. Failure may be due to a
/// bounds violation or an implementation-specific error.
virtual int readByte(uint64_t address, uint8_t *ptr) const = 0;
/// readBytes - Tries to read a contiguous range of bytes from the
/// region, up to the end of the region.
/// You should override this function if there is a quicker
/// way than going back and forth with individual bytes.
///
/// @param address - The address of the first byte, in the same space as
/// getBase().
/// @param size - The number of bytes to copy.
/// @param buf - A pointer to a buffer to be filled in. Must be non-NULL
/// and large enough to hold size bytes.
/// @result - 0 if successful; -1 if not. Failure may be due to a
/// bounds violation or an implementation-specific error.
virtual int readBytes(uint64_t address, uint64_t size, uint8_t *buf) const;
};
}
#endif
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