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//===------------------------- cxa_handlers.cpp ---------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//
// This file implements the functionality associated with the terminate_handler,
// unexpected_handler, and new_handler.
//===----------------------------------------------------------------------===//
#include <stdexcept>
#include <new>
#include <exception>
#include "abort_message.h"
#include "cxxabi.h"
#include "cxa_handlers.hpp"
#include "cxa_exception.hpp"
#include "private_typeinfo.h"
namespace std
{
unexpected_handler
get_unexpected() _NOEXCEPT
{
return __sync_fetch_and_add(&__cxa_unexpected_handler, (unexpected_handler)0);
// The above is safe but overkill on x86
// Using of C++11 atomics this should be rewritten
// return __cxa_unexpected_handler.load(memory_order_acq);
}
void
__unexpected(unexpected_handler func)
{
func();
// unexpected handler should not return
abort_message("unexpected_handler unexpectedly returned");
}
__attribute__((noreturn))
void
unexpected()
{
__unexpected(get_unexpected());
}
terminate_handler
get_terminate() _NOEXCEPT
{
return __sync_fetch_and_add(&__cxa_terminate_handler, (terminate_handler)0);
// The above is safe but overkill on x86
// Using of C++11 atomics this should be rewritten
// return __cxa_terminate_handler.load(memory_order_acq);
}
void
__terminate(terminate_handler func) _NOEXCEPT
{
#ifndef _LIBCXXABI_NO_EXCEPTIONS
try
{
#endif // _LIBCXXABI_NO_EXCEPTIONS
func();
// handler should not return
abort_message("terminate_handler unexpectedly returned");
#ifndef _LIBCXXABI_NO_EXCEPTIONS
}
catch (...)
{
// handler should not throw exception
abort_message("terminate_handler unexpectedly threw an exception");
}
#endif // _LIBCXXABI_NO_EXCEPTIONS
}
__attribute__((noreturn))
void
terminate() _NOEXCEPT
{
// If there might be an uncaught exception
using namespace __cxxabiv1;
__cxa_eh_globals* globals = __cxa_get_globals_fast();
if (globals)
{
__cxa_exception* exception_header = globals->caughtExceptions;
if (exception_header)
{
_Unwind_Exception* unwind_exception =
reinterpret_cast<_Unwind_Exception*>(exception_header + 1) - 1;
bool native_exception =
(unwind_exception->exception_class & get_vendor_and_language) ==
(kOurExceptionClass & get_vendor_and_language);
if (native_exception)
__terminate(exception_header->terminateHandler);
}
}
__terminate(get_terminate());
}
// In the future this will become:
// std::atomic<std::new_handler> __cxa_new_handler(0);
extern "C" {
new_handler __cxa_new_handler = 0;
}
new_handler
set_new_handler(new_handler handler) _NOEXCEPT
{
return __atomic_exchange_n(&__cxa_new_handler, handler, __ATOMIC_ACQ_REL);
// Using of C++11 atomics this should be rewritten
// return __cxa_new_handler.exchange(handler, memory_order_acq_rel);
}
new_handler
get_new_handler() _NOEXCEPT
{
return __sync_fetch_and_add(&__cxa_new_handler, (new_handler)0);
// The above is safe but overkill on x86
// Using of C++11 atomics this should be rewritten
// return __cxa_new_handler.load(memory_order_acq);
}
} // std
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