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#ifndef LIBTRELLIS_CRAM_HPP
#define LIBTRELLIS_CRAM_HPP
#include <cstdint>
#include <memory>
#include <vector>
using namespace std;
namespace Trellis {
// This represents the difference between two CRAMViews
struct ChangedBit {
int frame;
int bit;
int delta; // -1, 0 or +1 (false-true, equal, true-false)
inline bool operator==(const ChangedBit &other) {
return (frame == other.frame) && (bit == other.bit) && (delta == other.delta);
}
};
typedef vector<ChangedBit> CRAMDelta;
// This represents a view into the configuration memory, typically used to represent a tile
class CRAMView {
public:
// Access a bit inside the CRAM view by frame and bit offset within the view
char &bit(int frame, int bit) const;
// Primarily for Python use
bool get_bit(int frame, int biti) const;
void set_bit(int frame, int biti, bool value);
// Return the number of frames inside the view
int frames() const;
// Return the number of bits inside the view
int bits() const;
// Clear the CRAM region
void clear();
friend CRAMDelta operator-(const CRAMView &a, const CRAMView &b);
private:
// Private constructor, CRAM::make_view should always be used
CRAMView(shared_ptr<vector<vector<char>>> data, int frame_offset, int bit_offset, int frame_count, int bit_count);
int frame_offset;
int bit_offset;
int frame_count;
int bit_count;
friend class CRAM;
shared_ptr<vector<vector<char>>> cram_data;
};
CRAMDelta operator-(const CRAMView &a, const CRAMView &b);
// This represents the chip configuration RAM, and allows views of it to be made (for tile accesses)
// N.B. all accesses are in the format (frame, bit)
class CRAM {
public:
// Construct empty CRAM given size
CRAM(int frames, int bits);
// Access a bit in the CRAM given frame and bit offset
char &bit(int frame, int bit) const;
// Primarily for Python use
bool get_bit(int frame, int biti) const;
void set_bit(int frame, int biti, bool value);
// Return number of frames in CRAM
int frames() const;
// Return number of bits per frame in CRAM
int bits() const;
// Make a view to the CRAM given frame and bit offset; and frames and bits per frame in the view
CRAMView make_view(int frame_offset, int bit_offset, int frame_count, int bit_count);
// Using a shared_ptr so views are not invalidated even if the CRAM itself is deleted
// A vector of type char is used as the optimisations in vector<bool> are not worth the loss of bool& etc
shared_ptr<vector<vector<char>>> data;
};
}
#endif //LIBTRELLIS_CRAM_HPP
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