/*
+ * Acess2 C++ Support Library
+ * - By John Hodge (thePowersGang)
+ *
+ * exception_handling.cc
+ * - Exception handling code (defined by C++ ABI)
+ *
+ * References:
+ * - LLVM Exception handling
+ * > http://llvm.org/docs/ExceptionHandling.html
+ * - Itanium C++ ABI
+ * >http://mentorembedded.github.io/cxx-abi/abi-eh.html
+ * - HP's "aC++" Document, Ch 7 "Exception Handling Tables"
+ * > http://mentorembedded.github.io/cxx-abi/exceptions.pdf
*/
#include <typeinfo>
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <exception>
-#include "exception_handling.h"
+#include "exception_handling_cxxabi.h"
#include <acess/sys.h>
+#define DEBUG_ENABLED 1
+
+#if DEBUG_ENABLED
+# define DEBUG(v...) ::_SysDebug(v)
+#else
+# define DEBUG(v...) do{}while(0)
+#endif
+
/*__thread*/ struct __cxa_eh_globals {
__cxa_exception *caughtExceptions;
unsigned int uncaughtExceptions;
extern "C" void *__cxa_allocate_exception(size_t thrown_size)
{
- ::_SysDebug("__cxa_allocate_exception(%i)", thrown_size);
+ DEBUG("__cxa_allocate_exception(%i)", thrown_size);
__cxa_exception *ret = static_cast<__cxa_exception*>( malloc( sizeof(__cxa_exception) + thrown_size ) );
if( !ret ) {
if( thrown_size <= sizeof(emergency_exception.buf) && TEST_AND_SET(emergency_exception_used) )
_SysDebug("__cxa_allocate_exception - No free space");
::std::terminate();
}
- ::_SysDebug("__cxa_allocate_exception: return %p", ret+1);
+ DEBUG("__cxa_allocate_exception: return %p", ret+1);
return ret + 1;
}
extern "C" void __cxa_free_exception(void *thrown_exception)
{
- ::_SysDebug("__cxa_free_exception(%p)", thrown_exception);
+ DEBUG("__cxa_free_exception(%p)", thrown_exception);
if(thrown_exception == &emergency_exception.buf) {
//assert(emergency_exception_used);
emergency_exception_used = false;
extern "C" void __cxa_throw(void *thrown_exception, std::type_info *tinfo, void (*dest)(void*))
{
- ::_SysDebug("__cxa_throw(%p,%p,%p) '%s'", thrown_exception, tinfo, dest, tinfo->name());
+ #if DEBUG_ENABLED
+ DEBUG("__cxa_throw(%p,%p,%p) '%s' by %p",
+ thrown_exception, tinfo, dest, tinfo->name(), __builtin_return_address(0)
+ );
{
const ::std::exception* e = reinterpret_cast<const ::std::exception*>(thrown_exception);
- ::_SysDebug("- e.what() = '%s'", e->what());
+ DEBUG("- e.what() = '%s'", e->what());
}
- ::_SysDebug("- typeid(*tinfo) = %p", &typeid(*tinfo));
+ #endif
__cxa_exception *except = static_cast<__cxa_exception*>( thrown_exception ) - 1;
except->terminateHandler = 0;
except->exceptionType = tinfo;
except->exceptionDestructor = dest;
- memcpy(&except->unwindHeader.exception_class, "Ac20C++\0", 8);
+ memcpy(&except->unwindHeader.exception_class, EXCEPTION_CLASS_ACESS, 8);
__cxa_get_globals()->uncaughtExceptions ++;
- _Unwind_RaiseException(thrown_exception);
+ int rv = _Unwind_RaiseException( &except->unwindHeader );
- ::_SysDebug("__cxa_throw(%p,%s) :: UNCAUGHT", thrown_exception, tinfo->name());
+ ::_SysDebug("__cxa_throw(%p,%s) :: UNCAUGHT %i", thrown_exception, tinfo->name(), rv);
::std::terminate();
}
-extern "C" void *__cxa_begin_catch(void *exceptionObject)
+extern "C" void *__cxa_begin_catch(_Unwind_Exception *exceptionObject)
{
- ::_SysDebug("__cxa_begin_catch(%p)", exceptionObject);
- __cxa_exception *except = static_cast<__cxa_exception*>( exceptionObject ) - 1;
+ __cxa_exception *except = reinterpret_cast<__cxa_exception*>( exceptionObject+1 )-1;
+ DEBUG("__cxa_begin_catch(%p) - except=%p", exceptionObject, except);
except->handlerCount ++;
__cxa_get_globals_fast()->uncaughtExceptions --;
- return except;
+ return except+1;
}
extern "C" void __cxa_end_catch()
{
struct __cxa_exception *except = __cxa_get_globals()->caughtExceptions;
- ::_SysDebug("__cxa_end_catch - %p", except);
+ DEBUG("__cxa_end_catch - %p", except);
except->handlerCount --;
__cxa_get_globals()->caughtExceptions = except->nextException;
}
}
+