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60 lines
2.1 KiB
Objective-C
60 lines
2.1 KiB
Objective-C
#include "objc/runtime.h"
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#include "objc/objc-exception.h"
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#include "objc/hooks.h"
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#include <stdio.h>
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#include <windows.h>
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#define STATUS_GCC_THROW 0x20474343
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extern void *__cxa_current_exception_type(void);
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extern void __cxa_rethrow();
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BOOL handler_installed = NO;
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_Thread_local BOOL in_handler = NO;
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// This vectored exception handler is the last handler to get invoke for every exception (Objective C or foreign).
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// It calls _objc_unexpected_exception only when the exception is a C++ exception (ex->ExceptionCode == STATUS_GCC_THROW)
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// and the exception is an Objective C exception.
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// It always returns EXCEPTION_CONTINUE_SEARCH, so Windows will continue handling the exception.
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static LONG CALLBACK _objc_vectored_exception_handler(EXCEPTION_POINTERS* exceptionInfo)
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{
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const EXCEPTION_RECORD* ex = exceptionInfo->ExceptionRecord;
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if (_objc_unexpected_exception != 0
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&& ex->ExceptionCode == STATUS_GCC_THROW
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&& !in_handler)
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{
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// Rethrow the current exception and use the @catch clauses to determine whether it's an Objective C exception
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// or a foreign exception.
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if (__cxa_current_exception_type()) {
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in_handler = YES;
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@try {
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__cxa_rethrow();
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} @catch (id e) {
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// Invoke _objc_unexpected_exception for Objective C exceptions
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(*_objc_unexpected_exception)((id)e);
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} @catch (...) {
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// Ignore foreign exceptions.
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}
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in_handler = NO;
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}
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}
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// EXCEPTION_CONTINUE_SEARCH instructs the exception handler to continue searching for appropriate exception handlers.
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return EXCEPTION_CONTINUE_SEARCH;
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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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objc_uncaught_exception_handler previousHandler = __atomic_exchange_n(&_objc_unexpected_exception, handler, __ATOMIC_SEQ_CST);
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// Add a vectored exception handler to support the hook. We only need to do this once.
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if (!handler_installed) {
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AddVectoredExceptionHandler(0 /* The handler is the last handler to be called */ , _objc_vectored_exception_handler);
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handler_installed = YES;
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}
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return previousHandler;
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}
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