/**

 * vim: set ts=4 :

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

 * SourcePawn

 * Copyright (C) 2004-2008 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, version 3.0, as published by the

 * Free Software Foundation.

 * 

 * 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, see <http://www.gnu.org/licenses/>.

 *

 * As a special exception, AlliedModders LLC gives you permission to link the

 * code of this program (as well as its derivative works) to "Half-Life 2," the

 * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software

 * by the Valve Corporation.  You must obey the GNU General Public License in

 * all respects for all other code used.  Additionally, AlliedModders LLC grants

 * this exception to all derivative works.  AlliedModders LLC defines further

 * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),

 * or <http://www.sourcemod.net/license.php>.

 *

 * Version: $Id$

 */

#ifndef _INCLUDE_SOURCEPAWN_VM_ENGINE_H_

#define _INCLUDE_SOURCEPAWN_VM_ENGINE_H_

#include "sp_vm_api.h"

#include "sp_vm_function.h"

struct TracedCall

{

	uint32_t cip;

	uint32_t frm;

	sp_context_t *ctx;

	TracedCall *next;

	unsigned int chain;

};

class CContextTrace : public IContextTrace

{

public:

	CContextTrace(TracedCall *pStart, int error, const char *msg, uint32_t native);

public:

	int GetErrorCode();

	const char *GetErrorString();

	bool DebugInfoAvailable();

	const char *GetCustomErrorString();

	bool GetTraceInfo(CallStackInfo *trace);

	void ResetTrace();

	const char *GetLastNative(uint32_t *index);

private:

	int m_Error;

	const char *m_pMsg;

	TracedCall *m_pStart;

	TracedCall *m_pIterator;

	uint32_t m_Native;

};

class SourcePawnEngine : public ISourcePawnEngine

{

public:

	SourcePawnEngine();

	~SourcePawnEngine();

public: //ISourcePawnEngine

	sp_plugin_t *LoadFromFilePointer(FILE *fp, int *err);

	sp_plugin_t *LoadFromMemory(void *base, sp_plugin_t *plugin, int *err);

	int FreeFromMemory(sp_plugin_t *plugin);

	IPluginContext *CreateBaseContext(sp_context_t *ctx);

	void FreeBaseContext(IPluginContext *ctx);

	void *BaseAlloc(size_t size);

	void BaseFree(void *memory);

	void *ExecAlloc(size_t size);

	void ExecFree(void *address);

	IDebugListener *SetDebugListener(IDebugListener *pListener);

	unsigned int GetContextCallCount();

	unsigned int GetEngineAPIVersion();

	void *AllocatePageMemory(size_t size);

	void SetReadWrite(void *ptr);

	void SetReadExecute(void *ptr);

	void FreePageMemory(void *ptr);

public: //Debugger Stuff

	/**

	 * @brief Pushes a context onto the top of the call tracer.

	 * 

	 * @param ctx		Plugin context.

	 */

	void PushTracer(sp_context_t *ctx);

	/**

	 * @brief Pops a plugin off the call tracer.

	 */

	void PopTracer(int error, const char *msg);

	/**

	 * @brief Runs tracer from a debug break.

	 */

	void RunTracer(sp_context_t *ctx, uint32_t frame, uint32_t codeip);

public: //Plugin function stuff

	CFunction *GetFunctionFromPool(funcid_t f, IPluginContext  *plugin);

	void ReleaseFunctionToPool(CFunction *func);

private:

	TracedCall *MakeTracedCall(bool new_chain);

	void FreeTracedCall(TracedCall *pCall);

private:

	IDebugListener *m_pDebugHook;

	TracedCall *m_FreedCalls;

	TracedCall *m_CallStack;

	unsigned int m_CurChain;

	//CFunction *m_pFreeFuncs;

};

#endif //_INCLUDE_SOURCEPAWN_VM_ENGINE_H_