/**

 * vim: set ts=4 :

 * ===============================================================

 * SourceMod BinTools Extension

 * Copyright (C) 2004-2007 AlliedModders LLC. All rights reserved.

 * ===============================================================

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 * 

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

 *

 * Version: $Id$

 */

#include "extension.h"

#include "CallWrapper.h"

CallWrapper::CallWrapper(CallConvention cv, const PassInfo *paramInfo, const PassInfo *retInfo, unsigned int numParams)

{

	m_Cv = cv;

	if (numParams)

	{

		m_Params = new PassEncode[numParams];

		for (size_t i=0; i<numParams; i++)

		{

			m_Params[i].info = paramInfo[i];

		}

	}

	if (retInfo)

	{

		m_RetParam = new PassInfo;

		*m_RetParam = *retInfo;

	} else {

		m_RetParam = NULL;

	}

	m_NumParams = numParams;

	/* Calculate virtual stack offsets for each parameter */

	size_t offs = 0;

	if (cv == CallConv_ThisCall)

	{

		offs += sizeof(void *);

	}

	for (size_t i=0; i<numParams; i++)

	{

		m_Params[i].offset = offs;

		offs += m_Params[i].info.size;

	}

}

CallWrapper::~CallWrapper()

{

	delete [] m_Params;

	delete m_RetParam;

	g_SPEngine->ExecFree(m_Addrs[ADDR_CODEBASE]);

}

CallConvention CallWrapper::GetCallConvention()

{

	return m_Cv;

}

const PassEncode *CallWrapper::GetParamInfo(unsigned int num)

{

	return (num+1 > m_NumParams) ? NULL : &m_Params[num];

}

const PassInfo *CallWrapper::GetReturnInfo()

{

	return m_RetParam;

}

unsigned int CallWrapper::GetParamCount()

{

	return m_NumParams;

}

void CallWrapper::Execute(void *vParamStack, void *retBuffer)

{

	typedef void (*CALL_EXECUTE)(void *, void *);

	CALL_EXECUTE fn = (CALL_EXECUTE)m_Addrs[ADDR_CODEBASE];

	fn(vParamStack, retBuffer);

}