torc/architecture/Segments.hpp

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// Torc - Copyright 2011 University of Southern California.  All Rights Reserved.
// $HeadURL: https://svn.east.isi.edu/torc/trunk/src/torc/architecture/Segments.hpp $
// $Id: Segments.hpp 477 2011-06-05 02:15:29Z nsteiner $

// This program is free software: you can redistribute it and/or modify it under the terms of the 
// GNU General Public License as published by the Free Software Foundation, either version 3 of the 
// License, or (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See 
// the GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License along with this program.  If 
// not, see <http://www.gnu.org/licenses/>.

/// \file
/// \brief Header for the Segments class.

#ifndef TORC_ARCHITECTURE_SEGMENTS_HPP
#define TORC_ARCHITECTURE_SEGMENTS_HPP

#include "torc/architecture/XilinxDatabaseTypes.hpp"
#include "torc/architecture/DigestStream.hpp"
#include "torc/architecture/Array.hpp"
#include "torc/architecture/Tilewire.hpp"

namespace torc {
namespace architecture {

// forward declaration of our unit test class within its namespace
namespace architecture { class architecture_segments; }
namespace architecture { class segments_regression_test_helper; }
namespace architecture { class segments_unit_test_helper; }

    /// \brief Segment and irregular arc data for the device.
    /// \details Segment data is encoded in a collection of compact segments (segment shapes 
    ///     normalized to tile index 0) and a mapping from tilewires to segment references and 
    ///     anchor tile indexes.
    class Segments {
    // friends
        /// \brief The database has access to our protected functions.
        friend class DDB;
        /// \brief Our unit test has access to our protected functions.
        friend class torc::architecture::architecture::architecture_segments;
        friend class torc::architecture::architecture::segments_regression_test_helper;
        friend class torc::architecture::architecture::segments_unit_test_helper;
    protected:
    // types
        typedef std::string string;                     ///< \brief Imported type name.
        typedef xilinx::TileCount TileCount;            ///< \brief Imported type name.
        typedef xilinx::TileIndex TileIndex;            ///< \brief Imported type name.
        typedef xilinx::WireIndex WireIndex;            ///< \brief Imported type name.
        typedef xilinx::TileOffset TileOffset;          ///< \brief Imported type name.
        typedef xilinx::CompactSegmentCount CompactSegmentCount; ///< \brief Imported type name.
        typedef xilinx::CompactSegmentIndex CompactSegmentIndex; ///< \brief Imported type name.
    // enums
        enum { eSegmentUndefined = 0xffffffff, eSegmentTrivial = 0 };
    // nested classes
        /// \brief Encapsulation of a wire belonging to a compact segment.
        /// \details A compact segment is defined by wire indexes in tiles normalized relative to 
        ///     tile index 0.  The set of wire index and tile offset pairs fully defines the shape 
        ///     of the compact segment.
        class CompactSegmentTilewire {
            WireIndex mWireIndex;
            TileOffset mTileOffset;
        public:
            inline WireIndex getWireIndex(void) const { return mWireIndex; }
            inline TileOffset getTileOffset(void) const { return mTileOffset; }
            CompactSegmentTilewire(void) : mWireIndex(), mTileOffset() {}
            CompactSegmentTilewire(WireIndex inWireIndex, TileOffset inTileOffset)
                : mWireIndex(inWireIndex), mTileOffset(inTileOffset) {}
        };
        /// \brief Encapsulation of compact segment index and an anchoring tile index.
        /// \details Compact segments are normalized relative to tile index 0.  The accompanying 
        ///     tile index serves as an anchor from which to derive a full segment description.
        class SegmentReference {
            CompactSegmentIndex mCompactSegmentIndex;
            TileIndex mAnchorTileIndex;
        public:
            inline CompactSegmentIndex getCompactSegmentIndex(void) const 
                { return mCompactSegmentIndex; }
            inline TileIndex getAnchorTileIndex(void) const { return mAnchorTileIndex; }
            SegmentReference(void) : mCompactSegmentIndex(), mAnchorTileIndex() {}
            SegmentReference(CompactSegmentIndex inCompactSegmentIndex, TileIndex inAnchorTileIndex)
                : mCompactSegmentIndex(inCompactSegmentIndex), mAnchorTileIndex(inAnchorTileIndex) 
                {}
            void undefine(void) { 
                mCompactSegmentIndex = CompactSegmentIndex(eSegmentUndefined); 
                mAnchorTileIndex = TileIndex(eSegmentUndefined);
            }
            bool isDefined(void) const { return mCompactSegmentIndex != eSegmentUndefined; }
            bool isTrivial(void) const { return mCompactSegmentIndex == eSegmentTrivial; }
            static const SegmentReference& getTrivialSegment(void) 
                { return sTrivialSegmentReference; }
            static const SegmentReference sTrivialSegmentReference;
        };
        /// \brief Encapsulation of an irregular arc.
        /// \details Arcs which are defined for a tile type, but which are not instantiated in 
        ///     every single tile of that type are considered irregular, and must be considered on 
        ///     a case by case basis.  Every irregular arc in a given tile defines its source and 
        ///     sink wire indexes.
        class IrregularArc {
            WireIndex mSourceWireIndex;
            WireIndex mSinkWireIndex;
        public:
            inline WireIndex getSourceWireIndex(void) const { return mSourceWireIndex; }
            inline WireIndex getSinkWireIndex(void) const { return mSinkWireIndex; }
            IrregularArc(void) : mSourceWireIndex(), mSinkWireIndex() {}
            IrregularArc(WireIndex inSourceWireIndex, WireIndex inSinkWireIndex)
                : mSourceWireIndex(inSourceWireIndex), mSinkWireIndex(inSinkWireIndex) {}
        };
    // members
        /// \brief The compact segments in the device.
        Array2D<CompactSegmentTilewire> mCompactSegments;
        /// \brief The segment references for every wire in every tile.
        Array2D<SegmentReference> mTilewireSegments;
        /// \brief The irregular arcs for in the device.
        Array2D<IrregularArc> mIrregularArcs;
        /// \brief The number of compact segments in the device.
        CompactSegmentCount mCompactSegmentCount;
        /// \brief The number of irregular arcs in the device.
        uint32_t mIrregularArcCount;
        /// \brief The total number of defined wires on non-trivial segments.
        /// \note We cannot use a WireCount for this, because it is only intended for use in a 
        ///     single tile, and is consequently only 16 bits wide.
        uint32_t mTotalWireCount;
        /// \brief The total number of defined non-trivial segments.
        /// \note We could use a CompactSegmentCount for this, but that would be semantically 
        ///     incorrect because we are really counting full segments, not compact segments.
        uint32_t mTotalSegmentCount;
    // constructors
        /// \brief Protected constructor.
        Segments(void);
    // functions
        /// \brief Read the segment entries for every tile.
        size_t readTilewireSegments(DigestStream& inStream);
        /// \brief Read the compact segments for the device.
        size_t readSegments(DigestStream& inStream, bool inExtendedAnchorTileCount);
        /// \brief Read the irregular arcs for the device.
        size_t readIrregularArcs(DigestStream& inStream);
        /// \brief Return a pointer to the requested IrregularArc, or 0 if the arc does not exist.
        const Segments::IrregularArc* getIrregularArc(TileIndex inTileIndex, 
            WireIndex inSourceWireIndex, WireIndex inSinkWireIndex);
    public:
    // accessors
        /// \brief Return the total number of real wires in the device.
        uint32_t getTotalWireCount(void) const { return mTotalWireCount; }
        /// \brief Return the total number of full segments in the device.
        uint32_t getTotalSegmentCount(void) const { return mTotalSegmentCount; }
        /// \brief Return the number of compact segments in the device.
        uint32_t getCompactSegmentCount(void) const { return mCompactSegmentCount; }
        /// \brief Return the total number of irregular args in the device.
        uint32_t getIrregularArcCount(void) const { return mIrregularArcCount; }
        /// \brief Return the segment reference for the given tile and wire index.
        const Segments::SegmentReference& getTilewireSegment(const Tilewire& inTilewire) const {
            return mTilewireSegments[inTilewire.getTileIndex()][inTilewire.getWireIndex()];
        }
    };

} // namespace architecture
} // namespace torc

#endif // TORC_ARCHITECTURE_SEGMENTS_HPP

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