//**************************************************************************
//**
//**	##   ##    ##    ##   ##   ####     ####   ###     ###
//**	##   ##  ##  ##  ##   ##  ##  ##   ##  ##  ####   ####
//**	 ## ##  ##    ##  ## ##  ##    ## ##    ## ## ## ## ##
//**	 ## ##  ########  ## ##  ##    ## ##    ## ##  ###  ##
//**	  ###   ##    ##   ###    ##  ##   ##  ##  ##       ##
//**	   #    ##    ##    #      ####     ####   ##       ##
//**
//**	$Id: exception.h 4206 2010-04-03 16:32:33Z dj_jl $
//**
//**	Copyright (C) 1999-2010 Jānis Legzdiņš
//**
//**	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.
//**
//**************************************************************************

#define DO_GUARD		1
#define DO_CHECK		1

#ifdef PARANOID
#define DO_GUARD_SLOW	1
#define DO_CHECK_SLOW	1
#endif

//==========================================================================
//
//	Exceptions
//
//==========================================================================

class VException : VInterface
{
public:
	virtual const char* What() const = 0;
};

#define MAX_ERROR_TEXT_SIZE		1024

class VavoomError : public VException
{
public:
	char message[MAX_ERROR_TEXT_SIZE];

	explicit VavoomError(const char *text);
	const char* What() const;
};

class RecoverableError : public VavoomError
{
public:
	explicit RecoverableError(const char *text) : VavoomError(text) { }
};

class ZoneError : public VavoomError
{
public:
	explicit ZoneError(const char* text) : VavoomError(text) { }
};

//==========================================================================
//
//	Guard macros
//
//==========================================================================

//	Turn on usage of context in guard macros on platforms where it's not
// safe to throw an exception in signal handler.
#if DO_GUARD && defined(__linux__)
#define USE_GUARD_SIGNAL_CONTEXT
#endif

#ifdef USE_GUARD_SIGNAL_CONTEXT
#include <setjmp.h>
//	Stack control.
class __Context
{
public:
	__Context() { memcpy(&Last, &Env, sizeof(jmp_buf)); }
	~__Context() { memcpy(&Env, &Last, sizeof(jmp_buf)); }
	static jmp_buf Env;
	static const char* ErrToThrow;

protected:
	jmp_buf Last;
};
#endif

#if defined(_DEBUG) || !DO_GUARD
#define guard(name)		{static const char __FUNC_NAME__[] = #name; {
#define unguard			}}
#define unguardf(msg)	}}
#elif defined(USE_GUARD_SIGNAL_CONTEXT)
#define guard(name)		{static const char __FUNC_NAME__[] = #name; \
	__Context __LOCAL_CONTEXT__; try { if (setjmp(__Context::Env)) { \
	throw VavoomError(__Context::ErrToThrow); } else {
#define unguard			}} catch (RecoverableError &e) { throw e; } \
	catch (...) { Host_CoreDump(__FUNC_NAME__); throw; }}
#define unguardf(msg)	}} catch (RecoverableError &e) { throw e; } \
	catch (...) { Host_CoreDump(__FUNC_NAME__); Host_CoreDump msg; throw; }}
#else
#define guard(name)		{static const char __FUNC_NAME__[] = #name; try {
#define unguard			} catch (RecoverableError &e) { throw e; } \
	catch (...) { Host_CoreDump(__FUNC_NAME__); throw; }}
#define unguardf(msg)	} catch (RecoverableError &e) { throw e; } \
	catch (...) { Host_CoreDump(__FUNC_NAME__); Host_CoreDump msg; throw; }}
#endif

#if !defined(_DEBUG) && DO_GUARD_SLOW
#define guardSlow(name)		guard(name)
#define unguardSlow			unguard
#define unguardfSlow(msg)	unguardf(msg)
#else
#define guardSlow(name)		{
#define unguardSlow			}
#define unguardfSlow(msg)	}
#endif

void Host_CoreDump(const char *fmt, ...);
void __attribute__((noreturn, format(printf, 1, 2))) __declspec(noreturn) 
	Sys_Error(const char*, ...);

//==========================================================================
//
//	Assertion macros
//
//==========================================================================

#if DO_CHECK
#define check(e)	if (!(e)) throw VavoomError("Assertion failed: " #e)
#define verify(e)	if (!(e)) throw VavoomError("Assertion failed: " #e)
#else
#define check(e)
#define verify(e)	(e)
#endif

#if DO_CHECK_SLOW
#define checkSlow(e)	check(e)
#define verifySlow(e)	verify(e)
#else
#define checkSlow(e)
#define verifySlow(e)	(e)
#endif