instance_specific_extensions_int.h

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#ifndef TLM_UTILS_INSTANCE_SPECIFIC_EXTENSIONS_INT_H_INCLUDED_
#define TLM_UTILS_INSTANCE_SPECIFIC_EXTENSIONS_INT_H_INCLUDED_

#ifndef SC_BUILD // incluce full TLM, when not building the library
#include <tlm>
#else
#include "tlm_core/tlm_2/tlm_generic_payload/tlm_gp.h"
#endif // SC_BUILD

namespace tlm_utils {
class SC_API ispex_base;
class SC_API instance_specific_extension_accessor;
class SC_API instance_specific_extension_container;
class instance_specific_extension_carrier;
class instance_specific_extension_container_pool;
}

namespace tlm {
SC_API_TEMPLATE_DECL_ tlm_array<tlm_utils::ispex_base*>;
} // namespace tlm

namespace tlm_utils {

//The private extension base. Similar to normal extension base, but without clone and free
class SC_API ispex_base
{
    friend class tlm::tlm_array<ispex_base*>;
    void free() {} // needed for explicit tlm_array instantiation
public:
    virtual ~ispex_base() {}
protected:
    static unsigned int register_private_extension(const std::type_info&);
};

//this thing is basically a snippet of the generic_payload
// it contains all the extension specific code (the extension API so to speak)
// the differences are:
// - it calls back to its owner whenever a real (==non-NULL) extension gets set for the first time
// - it calls back to its owner whenever a living (==non-NULL) extension gets cleared
class SC_API instance_specific_extensions_per_accessor
{
public:
  typedef instance_specific_extension_container container_type;

  explicit
  instance_specific_extensions_per_accessor(container_type* container)
    : m_container(container)
  {}

  template <typename T> T* set_extension(T* ext)
  {
      return static_cast<T*>( set_extension(T::priv_id, ext) );
  }

  // non-templatized version with manual index:
  ispex_base* set_extension(unsigned int index, ispex_base* ext);

  // Check for an extension, ext will point to 0 if not present
  template <typename T> void get_extension(T*& ext) const
  {
      ext = static_cast<T*>(get_extension(T::priv_id));
  }
  // Non-templatized version:
   ispex_base* get_extension(unsigned int index) const;

  // Clear extension, the argument is needed to find the right index:
  template <typename T> void clear_extension(const T*)
  {
      clear_extension(T::priv_id);
  }

  // Non-templatized version with manual index
  void clear_extension(unsigned int index);

  // Make sure the extension array is large enough. Can be called once by
  // an initiator module (before issuing the first transaction) to make
  // sure that the extension array is of correct size. This is only needed
  // if the initiator cannot guarantee that the generic payload object is
  // allocated after C++ static construction time.
  void resize_extensions();

private:
  tlm::tlm_array<ispex_base*> m_extensions;
  container_type* m_container;

}; // class instance_specific_extensions_per_accessor

#if defined(_MSC_VER) && !defined(SC_WIN_DLL_WARN)
#pragma warning(push)
#pragma warning(disable: 4251) // DLL import for vector
#endif

//this thing contains the vector of extensions per accessor
//which can be really large so this one should be pool allocated
// therefore it keeps a use_count of itself to automatically free itself
// - to this end it provides callbacks to the extensions per accessor
//   to increment and decrement the use_count
class SC_API instance_specific_extension_container
{
  friend class instance_specific_extension_accessor;
  friend class instance_specific_extension_carrier;
  friend class instance_specific_extension_container_pool;
  friend class instance_specific_extensions_per_accessor;

  typedef void release_fn(instance_specific_extension_carrier*,void*);

  instance_specific_extension_container();
  ~instance_specific_extension_container();

  void resize();

  void inc_use_count();
  void dec_use_count();

  static instance_specific_extension_container* create();
  void attach_carrier(instance_specific_extension_carrier*, void* txn, release_fn*);

  instance_specific_extensions_per_accessor* get_accessor(unsigned int index);

  std::vector<instance_specific_extensions_per_accessor*> m_ispex_per_accessor;
  unsigned int use_count;
  void* m_txn;
  release_fn* m_release_fn;
  instance_specific_extension_carrier* m_carrier;
  instance_specific_extension_container* next; //for pooling

}; // class instance_specific_extension_container

#if defined(_MSC_VER) && !defined(SC_WIN_DLL_WARN)
#pragma warning(pop)
#endif

// ----------------------------------------------------------------------------

//This class 'hides' all the instance specific extension stuff from the user
// he instantiates one of those (e.g. instance_specific_extension_accessor extAcc;) and can then access
// the private extensions
//    extAcc(txn).extensionAPIFnCall()
//  where extensionAPIFnCall is set_extension, get_extension, clear_extension,...
class SC_API instance_specific_extension_accessor
{
public:
  instance_specific_extension_accessor();

  template<typename T> // implementation in instance_specific_extensions.h
  inline instance_specific_extensions_per_accessor& operator()(T& txn);

protected:
  template<typename T>
  static void release_carrier(instance_specific_extension_carrier*, void* txn);

  unsigned int m_index;
}; // class instance_specific_extension_accessor

} // namespace tlm_utils
#endif // TLM_UTILS_INSTANCE_SPECIFIC_EXTENSIONS_INT_H_INCLUDED_