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#if defined(__has_include)
#if __has_include(<objc/hooks.h>)
#import "Foundation/NSObject.h"
#import "GNUstepBase/CXXException.h"
#include <objc/runtime.h>
#include <objc/hooks.h>
/** From the CodeSourcery ABI Spec, with C++ pointers turned to void*, and
* other parts abridged. */
typedef enum
{
_URC_FOREIGN_EXCEPTION_CAUGHT = 1
} _Unwind_Reason_Code;
struct _Unwind_Exception;
typedef void (*_Unwind_Exception_Cleanup_Fn) (_Unwind_Reason_Code,
struct _Unwind_Exception *);
struct _Unwind_Exception
{
uint64_t exception_class;
_Unwind_Exception_Cleanup_Fn exception_cleanup;
unsigned long private_1;
unsigned long private_2;
} __attribute__((__aligned__));
_Unwind_Reason_Code _Unwind_Resume_or_Rethrow(struct _Unwind_Exception *);
struct __cxa_exception
{
void *exceptionType;
void (*exceptionDestructor) (void *);
void (*unexpectedHandler) (void *);
void (*terminateHandler) (void *);
void *nextException;
int handlerCount;
int handlerSwitchValue;
const char * actionRecord;
const char * languageSpecificData;
void * catchTemp;
void * adjustedPtr;
struct _Unwind_Exception unwindHeader;
};
@implementation CXXException
static Class CXXExceptionClass;
// TODO: Add an API for registering other classes for other exception types
static Class boxClass(int64_t foo)
{
// Big endian platforms
if (foo == *(int64_t*)(void*)"GNUCC++\0")
{
return CXXExceptionClass;
}
// Little endian platforms
if (foo == *(int64_t*)(void*)"\0++CCUNG")
{
return CXXExceptionClass;
}
return Nil;
}
+ (void) load
{
CXXExceptionClass = self;
_objc_class_for_boxing_foreign_exception = boxClass;
}
+ (id) exceptionWithForeignException: (struct _Unwind_Exception*)ex
{
CXXException *box = [self new];
box->ex = ex;
return [box autorelease];
}
- (void*) thrownValue
{
return ex + 1;
}
- (void*) cxx_type_info
{
char *ptr = (char*)ex;
ptr -= __builtin_offsetof(struct __cxa_exception, unwindHeader);
return ((struct __cxa_exception*)(void*)ptr)->exceptionType;
}
- (void) rethrow
{
#if defined(WITH_UNWIND)
struct _Unwind_Exception *re = ex;
// We aren't allowed to hold onto the exception if it's been rethrown.
ex = 0;
_Unwind_Resume_or_Rethrow(re);
#endif
}
- (void) dealloc
{
if (0 != ex && 0 != ex->exception_cleanup)
{
ex->exception_cleanup(_URC_FOREIGN_EXCEPTION_CAUGHT, ex);
}
[super dealloc];
}
@end
#endif
#endif
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