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142 lines
3.6 KiB
C++
142 lines
3.6 KiB
C++
#include <atomic>
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#include <stdlib.h>
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#include <stdio.h>
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#include <windows.h>
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#include "dwarf_eh.h"
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#include "objcxx_eh_private.h"
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#include "objcxx_eh.h"
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#include "objc/runtime.h"
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#include "objc/objc-arc.h"
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#include "objc/objc-exception.h"
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#include "objc/hooks.h"
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namespace __cxxabiv1
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{
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struct __cxa_refcounted_exception
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{
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int referenceCount;
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};
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}
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using namespace __cxxabiv1;
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extern "C" __cxa_refcounted_exception* __cxa_init_primary_exception(void *obj, std::type_info *tinfo, void (*dest) (void *));
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static void eh_cleanup(void *exception)
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{
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DEBUG_LOG("eh_cleanup: Releasing 0x%x\n", *(id*)exception);
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objc_release(*(id*)exception);
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}
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/**
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* Flag indicating that we've already inspected a C++ exception and found all
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* of the offsets.
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*/
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std::atomic<bool> done_setup;
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/**
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* The size of the `_Unwind_Exception` (including padding) in a
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* `__cxa_exception`.
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*/
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std::atomic<size_t> exception_struct_size;
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extern "C"
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OBJC_PUBLIC
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void objc_exception_throw(id object)
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{
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#ifdef __GLIBCXX__
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// Don't bother with a mutex here. It doesn't matter if two threads set
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// these values at the same time.
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if (!done_setup)
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{
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DEBUG_LOG("objc_exception_throw: Doing initial setup\n");
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MagicValueHolder *magicExc = (MagicValueHolder *)__cxa_allocate_exception(sizeof(MagicValueHolder));
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MagicValueHolder x;
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*magicExc = x;
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__cxa_refcounted_exception *header =
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__cxa_init_primary_exception(magicExc, & __objc_id_type_info, NULL);
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exception_struct_size = find_forwards(header, MagicValueHolder::magic);
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__cxa_free_exception(magicExc);
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DEBUG_LOG("objc_exception_throw: exception_struct_size: 0x%x\n", unsigned(exception_struct_size));
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done_setup = true;
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}
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#endif
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id *exc = (id *)__cxa_allocate_exception(sizeof(id));
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*exc = object;
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objc_retain(object);
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DEBUG_LOG("objc_exception_throw: Throwing 0x%x\n", *exc);
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#ifndef __GLIBCXX__
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// At the moment, only libstdc++ exposes __cxa_init_primary_exception.
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__cxa_throw(exc, & __objc_id_type_info, eh_cleanup);
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#else
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__cxa_eh_globals *globals = __cxa_get_globals ();
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globals->uncaughtExceptions += 1;
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__cxa_refcounted_exception *header =
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__cxa_init_primary_exception(exc, & __objc_id_type_info, eh_cleanup);
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header->referenceCount = 1;
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_Unwind_Exception *unwindHeader = pointer_add<_Unwind_Exception>(header, exception_struct_size - sizeof(_Unwind_Exception));
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_Unwind_Reason_Code err = _Unwind_RaiseException (unwindHeader);
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if (_URC_END_OF_STACK == err && 0 != _objc_unexpected_exception)
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{
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DEBUG_LOG("Invoking _objc_unexpected_exception\n");
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_objc_unexpected_exception(object);
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}
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DEBUG_LOG("Throw returned %d\n",(int) err);
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abort();
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#endif
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}
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OBJC_PUBLIC extern objc_uncaught_exception_handler objc_setUncaughtExceptionHandler(objc_uncaught_exception_handler handler)
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{
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return __atomic_exchange_n(&_objc_unexpected_exception, handler, __ATOMIC_SEQ_CST);
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}
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extern "C" void* __cxa_begin_catch(void *object);
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extern "C"
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OBJC_PUBLIC
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void* objc_begin_catch(void* object)
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{
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return __cxa_begin_catch(object);
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}
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extern "C" void __cxa_end_catch();
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extern "C"
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OBJC_PUBLIC
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void objc_end_catch()
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{
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__cxa_end_catch();
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}
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extern "C" void __cxa_rethrow();
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extern "C"
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OBJC_PUBLIC
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void objc_exception_rethrow()
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{
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__cxa_rethrow();
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}
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extern "C" EXCEPTION_DISPOSITION __gxx_personality_seh0(PEXCEPTION_RECORD ms_exc,
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void *this_frame,
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PCONTEXT ms_orig_context,
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PDISPATCHER_CONTEXT ms_disp);
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extern "C"
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OBJC_PUBLIC
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EXCEPTION_DISPOSITION __gnu_objc_personality_seh0(PEXCEPTION_RECORD ms_exc,
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void *this_frame,
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PCONTEXT ms_orig_context,
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PDISPATCHER_CONTEXT ms_disp)
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{
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return __gxx_personality_seh0(ms_exc, this_frame, ms_orig_context, ms_disp);
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}
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