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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
delegate.c
Templates and classes to enable delegates for callbacks.
***************************************************************************/
#include <assert.h>
#include "osdcomm.h"
#include "delegate.h"
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
#if (USE_DELEGATE_TYPE == DELEGATE_TYPE_COMPATIBLE)
delegate_mfp::raw_mfp_data delegate_mfp::s_null_mfp = { {0 }};
#endif
//**************************************************************************
// INTERNAL DELEGATE HELPERS
//**************************************************************************
#if (USE_DELEGATE_TYPE == DELEGATE_TYPE_INTERNAL)
/**
* @fn delegate_generic_function delegate_mfp::convert_to_generic(delegate_generic_class *&object) const
*
* @brief -------------------------------------------------
* delegate_convert_raw - given an object and an raw function, adjust the object base
* and return the actual final code pointer
* -------------------------------------------------.
*
* @param [in,out] object [in,out] If non-null, the object.
*
* @return The given data converted to a generic.
*/
delegate_generic_function delegate_mfp::convert_to_generic(delegate_generic_class *&object) const
{
// apply the "this" delta to the object first
object = reinterpret_cast<delegate_generic_class *>(reinterpret_cast<UINT8 *>(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<delegate_generic_function>(m_function);
// otherwise, it is the byte index into the vtable where the actual function lives
UINT8 *vtable_base = *reinterpret_cast<UINT8 **>(object);
return *reinterpret_cast<delegate_generic_function *>(vtable_base + m_function - 1);
}
#endif
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