ObjFW  Check-in [105d2f60b7]

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Comment:Make ObjC++ exceptions work on Windows with DWARF
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SHA3-256: 105d2f60b7c9580818d58ab384ab4d950dad8fbdc389295bac1ab4eb27dcbf28
User & Date: js on 2024-11-09 00:42:58
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Context
2024-11-09
00:46
Increase library versions check-in: f51da33bea user: js tags: 1.2
00:42
Make ObjC++ exceptions work on Windows with DWARF check-in: 105d2f60b7 user: js tags: 1.2
00:42
Make ObjC++ exceptions work on Windows with DWARF check-in: 643df20824 user: js tags: trunk
2024-11-08
22:43
OFColor: Improve style of deprecation message check-in: ff29e35344 user: js tags: 1.2
Changes
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Modified src/runtime/exception.m from [b7aba5c4db] to [0a89e50a33].

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#ifdef __SEH__
# include <windows.h>
#endif

#if defined(__SEH__)
# define PERSONALITY gnu_objc_personality
# define CXX_PERSONALITY_STR "__gxx_personality_seh0"
#elif defined(__USING_SJLJ_EXCEPTIONS__)
# define PERSONALITY __gnu_objc_personality_sj0
# define CXX_PERSONALITY_STR "__gxx_personality_sj0"
# define _Unwind_RaiseException _Unwind_SjLj_RaiseException
# define __builtin_eh_return_data_regno(i) (i)
#else
# define PERSONALITY __gnu_objc_personality_v0
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_Unwind_SetIP(struct _Unwind_Context *ctx, uintptr_t value)
{
	uintptr_t thumb = _Unwind_GetGR(ctx, 15) & 1;
	_Unwind_SetGR(ctx, 15, (value | thumb));
}
#endif

#if defined(OF_WINDOWS)
# ifdef __SEH__
static EXCEPTION_DISPOSITION (*cxx_personality)(PEXCEPTION_RECORD, void *,
    PCONTEXT, PDISPATCHER_CONTEXT);
# else
static PERSONALITY_FUNC((*cxx_personality));
# endif

OF_CONSTRUCTOR()
{
	/*
	 * This only works if the application uses libc++.dll or
	 * libstdc++-6.dll. There is unfortunately no other way, as Windows
	 * does not support proper weak linking.
	 */

	HMODULE module;

	module = GetModuleHandle("libc++");

	if (module == NULL)
		module = GetModuleHandle("libstdc++-6");

	if (module != NULL)
		cxx_personality = (__typeof__(cxx_personality))
		    GetProcAddress(module, CXX_PERSONALITY_STR);
}
#if defined(CXX_PERSONALITY_STR) && !defined(OF_AMIGAOS_M68K)
#elif !defined(OF_AMIGAOS_M68K)
static PERSONALITY_FUNC(cxx_personality) OF_WEAK_REF(CXX_PERSONALITY_STR);
#endif

#ifdef __SEH__
extern EXCEPTION_DISPOSITION _GCC_specific_handler(PEXCEPTION_RECORD, void *,
    PCONTEXT, PDISPATCHER_CONTEXT, _Unwind_Reason_Code (*)(int, int, uint64_t,
    struct _Unwind_Exception *, struct _Unwind_Context *));
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	struct LSDA LSDA;
	uintptr_t landingpad = 0;
	uint8_t found = 0;
	intptr_t filter = 0;

	if (foreign) {
		switch (exClass) {
#if defined(CXX_PERSONALITY_STR) && !defined(OF_AMIGAOS_M68K)
#if !defined(__SEH__) && !defined(OF_AMIGAOS_M68K)
		case GNUCCXX0_EXCEPTION_CLASS:
		case CLNGCXX0_EXCEPTION_CLASS:
			if (cxx_personality != NULL)
				return CALL_PERSONALITY(cxx_personality);
			break;
#endif
		}
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	objc_uncaught_exception_handler old = uncaughtExceptionHandler;
	uncaughtExceptionHandler = handler;

	return old;
}

#ifdef __SEH__
typedef EXCEPTION_DISPOSITION (*seh_personality_fn)(PEXCEPTION_RECORD, void *,
    PCONTEXT, PDISPATCHER_CONTEXT);
static seh_personality_fn __gxx_personality_seh0;

OF_CONSTRUCTOR()
{
	/*
	 * This only works if the application uses libc++.dll or
	 * libstdc++-6.dll. There is unfortunately no other way, as Windows
	 * does not support proper weak linking.
	 */

	HMODULE module;

	module = GetModuleHandle("libc++");

	if (module == NULL)
		module = GetModuleHandle("libstdc++-6");

	if (module != NULL)
		__gxx_personality_seh0 = (seh_personality_fn)
		    GetProcAddress(module, "__gxx_personality_seh0");
}

EXCEPTION_DISPOSITION
__gnu_objc_personality_seh0(PEXCEPTION_RECORD ms_exc, void *this_frame,
    PCONTEXT ms_orig_context, PDISPATCHER_CONTEXT ms_disp)
{
	struct _Unwind_Exception *ex =
	    (struct _Unwind_Exception *)ms_exc->ExceptionInformation[0];

	switch (ex->class) {
	case GNUCCXX0_EXCEPTION_CLASS:
	case CLNGCXX0_EXCEPTION_CLASS:
		if (__gxx_personality_seh0 != NULL)
			return __gxx_personality_seh0(ms_exc, this_frame,
		if (cxx_personality != NULL)
			return cxx_personality(ms_exc, this_frame,
			    ms_orig_context, ms_disp);
	}

	return _GCC_specific_handler(ms_exc, this_frame, ms_orig_context,
	    ms_disp, PERSONALITY);
}
#endif