cache_entry.hh

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#ifndef __BASE_CACHE_CACHE_ENTRY_HH__
#define __BASE_CACHE_CACHE_ENTRY_HH__
 
#include <cassert>
 
#include "base/cprintf.hh"
#include "base/types.hh"
#include "mem/cache/replacement_policies/replaceable_entry.hh"
#include "mem/cache/tags/indexing_policies/base.hh"
 
namespace gem5
{

class CacheEntry : public ReplaceableEntry
{
  public:
    using IndexingPolicy = BaseIndexingPolicy;
    using KeyType = Addr;
    using TagExtractor = std::function<Addr(Addr)>;
 
    CacheEntry(TagExtractor ext)
      : extractTag(ext), valid(false), tag(MaxAddr)
    {}
    ~CacheEntry() = default;

    virtual bool isValid() const { return valid; }

    virtual Addr getTag() const { return tag; }

    virtual bool
    match(const Addr addr) const
    {
        return isValid() && (getTag() == extractTag(addr));
    }

    virtual void
    insert(const Addr addr)
    {
        setValid();
        setTag(extractTag(addr));
    }

    virtual void
    invalidate()
    {
        valid = false;
        setTag(MaxAddr);
    }
 
    std::string
    print() const override
    {
        return csprintf("tag: %#x valid: %d | %s", getTag(),
                        isValid(), ReplaceableEntry::print());
    }
 
  protected:
    virtual void setTag(Addr _tag) { tag = _tag; }

    virtual void
    setValid()
    {
        assert(!isValid());
        valid = true;
    }
 
  private:
    TagExtractor extractTag;

    bool valid;

    Addr tag;
};
 
} // namespace gem5
 
#endif //__CACHE_ENTRY_HH__