support

/*	Copyright (C) 2004 Garrett A. Kajmowicz

	This file is part of the uClibc++ Library.

	This library is free software; you can redistribute it and/or
	modify it under the terms of the GNU Lesser General Public
	License as published by the Free Software Foundation; either
	version 2.1 of the License, or (at your option) any later version.

	This library 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
	Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public
	License along with this library; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include <exception>
#include <cstdlib>
#include <typeinfo>

#ifndef HEADER_ULC_SUPPORT
#define HEADER_ULC_SUPPORT 1

using namespace std;

//From C++ ABI spec
typedef enum {
	_URC_NO_REASON = 0,
	_URC_FOREIGN_EXCEPTION_CAUGHT = 1,
	_URC_FATAL_PHASE2_ERROR = 2,
	_URC_FATAL_PHASE1_ERROR = 3,
	_URC_NORMAL_STOP = 4,
	_URC_END_OF_STACK = 5,
	_URC_HANDLER_FOUND = 6,
	_URC_INSTALL_CONTEXT = 7,
	_URC_CONTINUE_UNWIND = 8
} _Unwind_Reason_Code;


typedef void (*_Unwind_Exception_Cleanup_Fn)
	(_Unwind_Reason_Code reason, struct _Unwind_Exception *exc);

//The following definitions were grabbed from the gcc implementation
typedef unsigned _Unwind_Ptr __attribute__((__mode__(__pointer__)));
typedef unsigned _Unwind_Word __attribute__((__mode__(__word__)));
typedef signed _Unwind_Sword __attribute__((__mode__(__word__)));
typedef unsigned _Unwind_Exception_Class __attribute__((__mode__(__DI__)));
typedef void (*_Unwind_Exception_Cleanup_Fn) (_Unwind_Reason_Code, struct _Unwind_Exception *);

typedef int _Unwind_Action;
static const _Unwind_Action _UA_SEARCH_PHASE = 1;
static const _Unwind_Action _UA_CLEANUP_PHASE = 2;
static const _Unwind_Action _UA_HANDLER_FRAME = 4;
static const _Unwind_Action _UA_FORCE_UNWIND = 8;

const _Unwind_Exception_Class __uclibcxx_exception_class = ((((((((
	_Unwind_Exception_Class) 'u' << 8 | (_Unwind_Exception_Class) 'l') << 8 
	| (_Unwind_Exception_Class) 'i') << 8 | (_Unwind_Exception_Class) 'b') << 8
	| (_Unwind_Exception_Class) 'C')<< 8 | (_Unwind_Exception_Class) '+') << 8 
	| (_Unwind_Exception_Class) '+') << 8 | (_Unwind_Exception_Class) '\0');


#define _UA_SEARCH_PHASE        1
#define _UA_CLEANUP_PHASE       2
#define _UA_HANDLER_FRAME       4
#define _UA_FORCE_UNWIND        8
#define _UA_END_OF_STACK        16

struct _Unwind_Exception{
        _Unwind_Exception_Class exception_class;		//Type of exception, eg ulibC++\0
        _Unwind_Exception_Cleanup_Fn exception_cleanup;		//Destructor if from diff runtime
        _Unwind_Word private_1;					//Don't touch at all!
        _Unwind_Word private_2;					//Don't touch at all!
} __attribute__((__aligned__));


//The following structure is system-dependent and defined by the compiler
//Thus it's definition was copied from the gcc 3.4.0 header files
struct _Unwind_Context;
//{
//	void *reg[DWARF_FRAME_REGISTERS+1];
//	void *cfa;
//	void *ra;
//	void *lsda;
//	struct dwarf_eh_bases bases;
//	_Unwind_Word args_size;
//};



_Unwind_Reason_Code _Unwind_RaiseException ( struct _Unwind_Exception *exception_object );

//_Unwind_ForcedUnwind 

typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)
	(int version, _Unwind_Action actions,  _Unwind_Exception_Class exceptionClass,
	struct _Unwind_Exception *exceptionObject, 
	struct _Unwind_Context *context, void *stop_parameter );

_Unwind_Reason_Code _Unwind_ForcedUnwind ( 
	struct _Unwind_Exception *exception_object, _Unwind_Stop_Fn stop,
	void *stop_parameter );

void _Unwind_Resume (struct _Unwind_Exception *exception_object);
void _Unwind_DeleteException (struct _Unwind_Exception *exception_object);

_Unwind_Word _Unwind_GetGR (struct _Unwind_Context *context, int index);
void _Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word);

_Unwind_Ptr _Unwind_GetIP (struct _Unwind_Context *context);
void _Unwind_SetIP (struct _Unwind_Context *context, _Unwind_Ptr new_value);

_Unwind_Ptr _Unwind_GetLanguageSpecificData (struct _Unwind_Context *context);
_Unwind_Ptr _Unwind_GetRegionStart (struct _Unwind_Context *context);

_Unwind_Reason_Code (*__personality_routine)
	(int version,					//Should be 1
	_Unwind_Action actions,				//Actions the routine will perform (bitmask)
	_Unwind_Exception_Class exceptionClass,		//Type of exception - vendor is high 4 bytes
	struct _Unwind_Exception *exceptionObject,	//Points to exception header
	struct _Unwind_Context *context);		//Unwinder state information


/*The following part is the Level II ABI which is required for compatability*/
//This might be the only stuff that *I* need to implement

struct __cxa_exception { 
	std::type_info *exceptionType;		//Type of thrown exception
	void (*exceptionDestructor) (void *); 	//Pointer to the destructor
	unexpected_handler unexpectedHandler;	//Unexpected handler to use
	terminate_handler terminateHandler;	//Terminate handle to use
	__cxa_exception *nextException;		//per thread linked list

	int handlerCount;			//How many handlers have caught this
	int handlerSwitchValue;			
	const char *actionRecord;
	const char *languageSpecificData;
	void *catchTemp;
	void *adjustedPtr;

	_Unwind_Exception unwindHeader;
};

struct __cxa_eh_globals {
	__cxa_exception *caughtExceptions;
	unsigned int uncaughtExceptions;
};

extern "C" __cxa_eh_globals *__cxa_get_globals(void);	//Return ptr to the eh_globals object for current thread
extern "C" __cxa_eh_globals *__cxa_get_globals_fast(void);	//Same as above, assumes that above called at least once

extern "C" void *__cxa_allocate_exception(size_t thrown_size);	//Allocate space for exception plus header
extern "C" void __cxa_free_exception(void *thrown_exception);	//Free space allocated from the above

extern "C" void __cxa_throw (void *thrown_exception, 	//This is the actual throw call
//	std::type_info *tinfo, 			//Type of object
	void * tinfo, 			//Type of object
	void (*dest) (void *) );		//Pointer to destructor destroy object


#endif