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// license:GPL-2.0+
// copyright-holders:Couriersud
/*
* ppmf.h
*
*/
#ifndef PPMF_H_
#define PPMF_H_
#include "pconfig.h"
#include <utility>
#include <cstdint>
/*
*
* NL_PMF_TYPE_GNUC_PMF
* Use standard pointer to member function syntax C++11
*
* NL_PMF_TYPE_GNUC_PMF_CONV
* Use gnu extension and convert the pmf to a function pointer.
* This is not standard compliant and needs
* -Wno-pmf-conversions to compile.
*
* NL_PMF_TYPE_INTERNAL
* Use the same approach as MAME for deriving the function pointer.
* This is compiler-dependent as well
*
* Benchmarks for ./nltool -c run -f src/mame/machine/nl_pong.cpp -t 10 -n pong_fast
*
* NL_PMF_TYPE_INTERNAL: 215% 215%
* NL_PMF_TYPE_GNUC_PMF: 163% 196%
* NL_PMF_TYPE_GNUC_PMF_CONV: 215% 215%
* NL_PMF_TYPE_VIRTUAL: 213% 209%
*
* The whole exercise was done to avoid virtual calls. In prior versions of
* netlist, the INTERNAL and GNUC_PMF_CONV approach provided significant improvement.
* Since than, "hot" was removed from functions declared as virtual.
* This may explain that the recent benchmarks show no difference at all.
*
*/
#if (PPMF_TYPE == PPMF_TYPE_GNUC_PMF_CONV)
#pragma GCC diagnostic ignored "-Wpmf-conversions"
#endif
namespace plib {
/*
* The following class was derived from the MAME delegate.h code.
* It derives a pointer to a member function.
*/
#if (PHAS_PMF_INTERNAL)
class mfp
{
public:
// construct from any member function pointer
class generic_class;
using generic_function = void (*)();
template<typename MemberFunctionType>
mfp(MemberFunctionType mftp)
: m_function(0), m_this_delta(0)
{
*reinterpret_cast<MemberFunctionType *>(this) = mftp;
}
template<typename FunctionType, typename MemberFunctionType, typename ObjectType>
static FunctionType get_mfp(MemberFunctionType mftp, ObjectType *object)
{
mfp mfpo(mftp);
//return mfpo.update_after_bind<FunctionType>(object);
return reinterpret_cast<FunctionType>(
mfpo.convert_to_generic(reinterpret_cast<generic_class *>(object)));
}
private:
// extract the generic function and adjust the object pointer
generic_function convert_to_generic(generic_class * object) const
{
// apply the "this" delta to the object first
generic_class * o_p_delta = reinterpret_cast<generic_class *>(reinterpret_cast<std::uint8_t *>(object) + m_this_delta);
// if the low bit of the vtable index is clear, then it is just a raw function pointer
if (!(m_function & 1))
return reinterpret_cast<generic_function>(m_function);
// otherwise, it is the byte index into the vtable where the actual function lives
std::uint8_t *vtable_base = *reinterpret_cast<std::uint8_t **>(o_p_delta);
return *reinterpret_cast<generic_function *>(vtable_base + m_function - 1);
}
// actual state
uintptr_t m_function; // first item can be one of two things:
// if even, it's a pointer to the function
// if odd, it's the byte offset into the vtable
int m_this_delta; // delta to apply to the 'this' pointer
};
#endif
#if (PPMF_TYPE == PPMF_TYPE_PMF)
template<typename R, typename... Targs>
class pmfp_base
{
public:
class generic_class;
#if defined (__INTEL_COMPILER) && defined (_M_X64) // needed for "Intel(R) C++ Intel(R) 64 Compiler XE for applications running on Intel(R) 64, Version 14.0.2.176 Build 20140130" at least
using generic_function = int [((sizeof(void *) + 4 * sizeof(int)) + (sizeof(int) - 1)) / sizeof(int)];
#elif defined(_MSC_VER)// all other cases - for MSVC maximum size is one pointer, plus 3 ints; all other implementations seem to be smaller
using generic_function = int [((sizeof(void *) + 3 * sizeof(int)) + (sizeof(int) - 1)) / sizeof(int)];
#else
using generic_function = R (generic_class::*)(Targs...);
#endif
pmfp_base() {}
template<typename MemberFunctionType, typename O>
void set_base(MemberFunctionType mftp, O *object)
{
using function_ptr = R (O::*)(Targs...);
function_ptr t = mftp;
*reinterpret_cast<function_ptr *>(&m_func) = t;
}
template<typename O>
inline R call(O *obj, Targs... args)
{
using function_ptr = R (O::*)(Targs...);
function_ptr t = *reinterpret_cast<function_ptr *>(&m_func);
return (obj->*t)(std::forward<Targs>(args)...);
}
private:
generic_function m_func;
};
#elif ((PPMF_TYPE == PPMF_TYPE_GNUC_PMF_CONV) || (PPMF_TYPE == PPMF_TYPE_INTERNAL))
template<typename R, typename... Targs>
class pmfp_base
{
public:
using generic_function = void (*)();
pmfp_base() : m_func(nullptr) {}
template<typename MemberFunctionType, typename O>
void set_base(MemberFunctionType mftp, O *object)
{
#if (PPMF_TYPE == PPMF_TYPE_INTERNAL)
using function_ptr = MEMBER_ABI R (*)(O *obj, Targs... args);
m_func = reinterpret_cast<generic_function>(plib::mfp::get_mfp<function_ptr>(mftp, object));
#elif (PPMF_TYPE == PPMF_TYPE_GNUC_PMF_CONV)
R (O::* pFunc)(Targs...) = mftp;
m_func = reinterpret_cast<generic_function>((object->*pFunc));
#endif
}
template<typename O>
inline R call(O *obj, Targs... args) const
{
using function_ptr = MEMBER_ABI R (*)(O *obj, Targs... args);
return (reinterpret_cast<function_ptr>(m_func))(obj, std::forward<Targs>(args)...);
}
bool is_set() { return m_func != nullptr; }
private:
generic_function m_func;
};
#endif
template<typename R, typename... Targs>
class pmfp : public pmfp_base<R, Targs...>
{
public:
class generic_class;
pmfp() : pmfp_base<R, Targs...>(), m_obj(nullptr) {}
template<typename MemberFunctionType, typename O>
pmfp(MemberFunctionType mftp, O *object)
{
this->set(mftp, object);
}
template<typename MemberFunctionType, typename O>
void set(MemberFunctionType mftp, O *object)
{
this->set_base(mftp, object);
m_obj = reinterpret_cast<generic_class *>(object);
}
inline R operator()(Targs... args)
{
return this->call(m_obj, std::forward<Targs>(args)...);
}
private:
generic_class *m_obj;
};
}
#endif /* PPMF_H_ */
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