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/*
* File: DataTarget.h
*
* Copyright (c) Freescale Semiconductor, Inc. All rights reserved.
* See included license file for license details.
*/
#if !defined(_DataTarget_h_)
#define _DataTarget_h_
#include "stdafx.h"
#include "DataSource.h"
namespace elftosb
{
// Forward declaration
class DataSource;
/*!
* \brief Abstract base class for the target address or range of data.
*
* Targets at the most basic level have a single address, and potentially
* an address range. Unbounded targets have a beginning address but no
* specific end address, while bounded targets do have an end address.
*
* Users of a data target can access the begin and end addresses directly.
* However, the most powerful way to use a target is with the
* getRangeForSegment() method. This method returns the target address range
* for a segment of a data source. The value of the resulting range can be
* completely dependent upon the segment's properties, those of its data
* source, and the type of data target.
*
* \see elftosb::DataSource
*/
class DataTarget
{
public:
//! \brief Simple structure that describes an addressed region of memory.
//! \todo Decide if the end address is inclusive or not.
struct AddressRange
{
uint32_t m_begin;
uint32_t m_end;
};
public:
//! \brief Default constructor.
DataTarget() : m_source(0) {}
//! \brief Destructor.
virtual ~DataTarget() {}
//! \brief Whether the target is just a single address or has an end to it.
virtual bool isBounded() { return false; }
virtual uint32_t getBeginAddress() { return 0; }
virtual uint32_t getEndAddress() { return 0; }
//! \brief Return the address range for a segment of a data source.
virtual DataTarget::AddressRange getRangeForSegment(DataSource & source, DataSource::Segment & segment)=0;
inline void setSource(DataSource * source) { m_source = source; }
inline DataSource * getSource() const { return m_source; }
protected:
DataSource * m_source; //!< Corresponding data source for this target.
};
/*!
* \brief Target with a constant values for the addresses.
*
* This target type supports can be both bounded and unbounded. It always has
* at least one address, the beginning address. The end address is optional,
* and if not provided makes the target unbounded.
*/
class ConstantDataTarget : public DataTarget
{
public:
//! \brief Constructor taking only a begin address.
ConstantDataTarget(uint32_t start) : DataTarget(), m_begin(start), m_end(0), m_hasEnd(false) {}
//! \brief Constructor taking both begin and end addresses.
ConstantDataTarget(uint32_t start, uint32_t end) : DataTarget(), m_begin(start), m_end(end), m_hasEnd(true) {}
//! \brief The target is bounded if an end address was specified.
virtual bool isBounded() { return m_hasEnd; }
virtual uint32_t getBeginAddress() { return m_begin; }
virtual uint32_t getEndAddress() { return m_end; }
//! \brief Return the address range for a segment of a data source.
virtual DataTarget::AddressRange getRangeForSegment(DataSource & source, DataSource::Segment & segment);
protected:
uint32_t m_begin; //!< Start address.
uint32_t m_end; //!< End address.
bool m_hasEnd; //!< Was an end address specified?
};
/*!
* \brief Target address that is the "natural" location of whatever the source data is.
*
* The data source used with the target must have a natural location. If
* getRangeForSegment() is called with a segment that does not have a natural
* location, a semantic_error will be thrown.
*/
class NaturalDataTarget : public DataTarget
{
public:
//! \brief Default constructor.
NaturalDataTarget() : DataTarget() {}
//! \brief Natural data targets are bounded by their source's segment lengths.
virtual bool isBounded() { return true; }
//! \brief Return the address range for a segment of a data source.
virtual DataTarget::AddressRange getRangeForSegment(DataSource & source, DataSource::Segment & segment);
};
}; // namespace elftosb
#endif // _DataTarget_h_
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