coherence_protocol.h

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#pragma once
 
#include "cache_abc.h"
 
#define STATE_ERR std::cerr << __FILE__ << ':' << __FUNCTION__ << ": Cache line in invalid state: " << (int)(line->state) << std::endl
#define UNIMPLEMENTED std::cerr << "Call of unimplemented bus message: " << __FUNCTION__ << std::endl; return false
 
class CoherenceProtocol {
public:
 
    CoherenceProtocol(CacheABC& cache) : cache(cache) {}
    virtual ~CoherenceProtocol() {}
 
    virtual void PrRd(cache_line* line) = 0;
    virtual void PrWr(cache_line* line) = 0;
 
    virtual bool BusRd(cache_line* line) = 0;
    virtual bool BusRdX(cache_line* line) { UNIMPLEMENTED; };
    virtual bool BusUpdt(cache_line* line) { UNIMPLEMENTED; };
    virtual bool BusUpgr(cache_line* line) { UNIMPLEMENTED; };
    virtual bool BusWr(cache_line* line) { UNIMPLEMENTED; };
 
    virtual bool doesDirtySharing() { return false; }
    virtual bool doesWriteNoAllocate() { return false; }
 
    virtual bool isWriteBackNeeded(state_e state) = 0;
 
protected:
 
    CacheABC& cache;
};
 
#define ADD_COHERENCE_TO_CMD_LINE(coh_prot) static int register_coherence = []() { \
if (coherence_map == nullptr) coherence_map = new std::map<std::string, coh_factory_t, ci_less>(); \
(*coherence_map)[#coh_prot] = [](CacheABC& cache) { return new coh_prot(cache); }; return 0; }()