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Diffstat (limited to 'trunk/src/emu/delegate.c')
-rw-r--r-- | trunk/src/emu/delegate.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/trunk/src/emu/delegate.c b/trunk/src/emu/delegate.c new file mode 100644 index 00000000000..0aaee215d61 --- /dev/null +++ b/trunk/src/emu/delegate.c @@ -0,0 +1,70 @@ +/*************************************************************************** + + delegate.c + + Templates and classes to enable delegates for callbacks. + +**************************************************************************** + + Copyright Aaron Giles + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in + the documentation and/or other materials provided with the + distribution. + * Neither the name 'MAME' nor the names of its contributors may be + used to endorse or promote products derived from this software + without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND ANY EXPRESS OR + IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + DISCLAIMED. IN NO EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT, + INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + POSSIBILITY OF SUCH DAMAGE. + +***************************************************************************/ + +#include "emucore.h" +#include "delegate.h" + + +//************************************************************************** +// INTERNAL DELEGATE HELPERS +//************************************************************************** + +#if (USE_DELEGATE_TYPE == DELEGATE_TYPE_INTERNAL) + +//------------------------------------------------- +// delegate_convert_raw - given an object and +// an raw function, adjust the object base and +// return the actual final code pointer +//------------------------------------------------- + +delegate_generic_function delegate_internal_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 |