ObjFW  Check-in [5eb22639e4]

				[Whether to use assembly for lookup])
		])

		AS_IF([test x"$enable_seluid24" = x"yes"], [
			AC_DEFINE(OF_SELUID24, 1,
				[Whether to use 24 bit selector UIDs])
		])

		AC_MSG_CHECKING(for exception type)
		AC_TRY_COMPILE([
			extern void foo();
		], [
			@try {
				foo();
			} @finally {
				foo();
			}
		], [
			AS_IF([$EGREP __gnu_objc_personality_v0 \
					conftest.$ac_objext >/dev/null], [
				exception_type="DWARF"
			])
			AS_IF([$EGREP __gnu_objc_personality_sj0 \
					conftest.$ac_objext >/dev/null], [
				exception_type="SjLj"
			])

			case $exception_type in
			DWARF)
				AC_DEFINE(HAVE_DWARF_EXCEPTIONS, 1,
					[Whether DWARF exceptions are used])
				;;
			SjLj)
				AC_DEFINE(HAVE_SJLJ_EXCEPTIONS, 1,
					[Whether SjLj exceptions are used])
				;;
			*)
				AC_MSG_RESULT(unknown)
				AC_MSG_ERROR([Exception type not detected!])
				;;
			esac

			AC_MSG_RESULT($exception_type)
		], [
			AC_MSG_RESULT(exceptions unavailable!)
			AC_MSG_ERROR([Exceptions not accepted by compiler!])
		])
		;;
	"Apple runtime")
		AC_DEFINE(OF_APPLE_RUNTIME, 1,
			[Whether we use the Apple ObjC runtime])

		AC_CHECK_LIB(objc, objc_msgSend, [
			LIBS="-lobjc $LIBS"

	uint8_t typestable_enc;
	const uint8_t *typestable;
	uintptr_t typestable_base;
	uint8_t callsites_enc;
	const uint8_t *callsites, *actiontable;
};

#ifndef HAVE_SJLJ_EXCEPTIONS
extern _Unwind_Reason_Code _Unwind_RaiseException(struct _Unwind_Exception*);
#else
extern _Unwind_Reason_Code _Unwind_SjLj_RaiseException(
    struct _Unwind_Exception*);
#endif
extern void* _Unwind_GetLanguageSpecificData(struct _Unwind_Context*);
extern uintptr_t _Unwind_GetRegionStart(struct _Unwind_Context*);
extern uintptr_t _Unwind_GetDataRelBase(struct _Unwind_Context*);
extern uintptr_t _Unwind_GetTextRelBase(struct _Unwind_Context*);

#if defined(__arm__) || defined(__ARM__)
extern _Unwind_Reason_Code __gnu_unwind_frame(struct _Unwind_Exception*,

#else
# define CONTINUE_UNWIND return _URC_CONTINUE_UNWIND

extern uintptr_t _Unwind_GetIP(struct _Unwind_Context*);
extern void _Unwind_SetIP(struct _Unwind_Context*, uintptr_t);
extern void _Unwind_SetGR(struct _Unwind_Context*, int, uintptr_t);
#endif

#if defined(HAVE_DWARF_EXCEPTIONS)
# define PERSONALITY __gnu_objc_personality_v0
# define RAISE_EXCEPTION _Unwind_RaiseException
#elif defined(HAVE_SJLJ_EXCEPTIONS)
# define PERSONALITY __gnu_objc_personality_sj0
# define RAISE_EXCEPTION _Unwind_SjLj_RaiseException
#else
# error Unknown exception type!
#endif

static objc_uncaught_exception_handler uncaught_exception_handler;

static uint64_t
read_uleb128(const uint8_t **ptr)
{
	uint64_t value = 0;

}

static bool
find_callsite(struct _Unwind_Context *ctx, struct lsda *lsda,
    uintptr_t *landingpad, const uint8_t **actionrecords)
{
	uintptr_t ip = _Unwind_GetIP(ctx);
	const uint8_t *ptr = lsda->callsites;

	*landingpad = 0;
	*actionrecords = NULL;

#ifndef HAVE_SJLJ_EXCEPTIONS
	while (ptr < lsda->actiontable) {
		uintptr_t callsite_start, callsite_len, callsite_landingpad;
		uintptr_t callsite_action;

		callsite_start = lsda->region_start +
		    (uintptr_t)read_value(lsda->callsites_enc, &ptr);
		callsite_len = (uintptr_t)read_value(lsda->callsites_enc, &ptr);

				    callsite_action - 1;

			return true;
		}
	}

	return false;
#else
	uintptr_t callsite_landingpad, callsite_action;

	if ((uintptr_t)ip < 1)
		return false;

	do {
		callsite_landingpad = (uintptr_t)read_uleb128(&ptr);
		callsite_action = (uintptr_t)read_uleb128(&ptr);
	} while (--ip > 1);

	*landingpad = callsite_landingpad + 1;
	if (callsite_action != 0)
		*actionrecords = lsda->actiontable + callsite_action - 1;

	return true;
#endif
}

static bool
class_matches(Class class, id object)
{
	Class iter;

	} while (displacement != 0);

	return 0;
}

#if defined(__arm__) || defined(__ARM__)
_Unwind_Reason_Code
PERSONALITY(uint32_t state, struct _Unwind_Exception *ex,
    struct _Unwind_Context *ctx)
{
	int version = 1;
	uint64_t ex_class = ex->class;
	int actions;

	switch (state) {

	default:
		return _URC_FAILURE;
	}

	_Unwind_SetGR(ctx, 12, (uintptr_t)ex);
#else
_Unwind_Reason_Code
PERSONALITY(int version, int actions, uint64_t ex_class,
    struct _Unwind_Exception *ex, struct _Unwind_Context *ctx)
{
#endif
	struct objc_exception *e = (struct objc_exception*)ex;
	bool foreign = (ex_class != objc_exception_class);
	const uint8_t *lsda_addr, *actionrecords;
	struct lsda lsda;

		abort();

	memset(e, 0, sizeof(*e));
	e->exception.class = objc_exception_class;
	e->exception.cleanup = cleanup;
	e->object = object;

	if (RAISE_EXCEPTION(&e->exception) == _URC_END_OF_STACK &&
	    uncaught_exception_handler != NULL)
		uncaught_exception_handler(object);

	abort();
}

objc_uncaught_exception_handler