libstdc++-v3/libsupc++/unwind-cxx.h - rust-lang/gcc - Git at Google

 // -*- C++ -*- Exception handling and frame unwind runtime interface routines.
 // Copyright (C) 2001-2025 Free Software Foundation, Inc.
 //
 // This file is part of GCC.
 //
 // GCC is free software; you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
 // the Free Software Foundation; either version 3, or (at your option)
 // any later version.
 //
 // GCC is distributed in the hope that it will be useful,
 // but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 // GNU General Public License for more details.
 //
 // Under Section 7 of GPL version 3, you are granted additional
 // permissions described in the GCC Runtime Library Exception, version
 // 3.1, as published by the Free Software Foundation.

 // You should have received a copy of the GNU General Public License and
 // a copy of the GCC Runtime Library Exception along with this program;
 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 // <http://www.gnu.org/licenses/>.

 // This is derived from the C++ ABI for IA-64.  Where we diverge
 // for cross-architecture compatibility are noted with "@@@".

 #ifndef _UNWIND_CXX_H
 #define _UNWIND_CXX_H 1

 // Level 2: C++ ABI

 #include <typeinfo>
 #include <exception>
 #include <cstddef>
 #include "unwind.h"
 #include <bits/atomic_word.h>
 #include <cxxabi.h>

 #ifdef _GLIBCXX_HAVE_SYS_SDT_H
 #include <sys/sdt.h>
 /* We only want to use stap probes starting with v3.  Earlier versions
    added too much startup cost.  */
 #if defined (STAP_PROBE2) && _SDT_NOTE_TYPE >= 3
 #define PROBE2(name, arg1, arg2) STAP_PROBE2 (libstdcxx, name, arg1, arg2)
 #endif
 #endif

 #ifndef PROBE2
 #define PROBE2(name, arg1, arg2)
 #endif

 #pragma GCC visibility push(default)

 namespace __cxxabiv1
 {

 // A primary C++ exception object consists of a header, which is a wrapper
 // around an unwind object header with additional C++ specific information,
 // followed by the exception object itself.

 struct __cxa_exception
 {
   // Manage the exception object itself.
   std::type_info *exceptionType;
   void (_GLIBCXX_CDTOR_CALLABI *exceptionDestructor)(void *);

   // The C++ standard has entertaining rules wrt calling set_terminate
   // and set_unexpected in the middle of the exception cleanup process.
   std::terminate_handler unexpectedHandler;
   std::terminate_handler terminateHandler;

   // The caught exception stack threads through here.
   __cxa_exception *nextException;

   // How many nested handlers have caught this exception.  A negated
   // value is a signal that this object has been rethrown.
   int handlerCount;

 #ifdef __ARM_EABI_UNWINDER__
   // Stack of exceptions in cleanups.
   __cxa_exception* nextPropagatingException;

   // The number of active cleanup handlers for this exception.
   int propagationCount;
 #else
   // Cache parsed handler data from the personality routine Phase 1
   // for Phase 2 and __cxa_call_unexpected.
   int handlerSwitchValue;
   const unsigned char *actionRecord;
   const unsigned char *languageSpecificData;
   _Unwind_Ptr catchTemp;
   void *adjustedPtr;
 #endif

   // The generic exception header.  Must be last.
   _Unwind_Exception unwindHeader;
 };

 struct __cxa_refcounted_exception
 {
   // Manage this header.
   _Atomic_word referenceCount;
   // __cxa_exception must be last, and no padding can be after it.
   __cxa_exception exc;
 };

 // A dependent C++ exception object consists of a wrapper around an unwind
 // object header with additional C++ specific information, containing a pointer
 // to a primary exception object.

 struct __cxa_dependent_exception
 {
   // The primary exception this thing depends on.
   void *primaryException;

   // Unused member to get similar layout to __cxa_exception, otherwise the
   // alignment requirements of _Unwind_Exception would require padding bytes
   // before the unwindHeader member.
   void (_GLIBCXX_CDTOR_CALLABI *__padding)(void *);

   // The C++ standard has entertaining rules wrt calling set_terminate
   // and set_unexpected in the middle of the exception cleanup process.
   std::terminate_handler unexpectedHandler;
   std::terminate_handler terminateHandler;

   // The caught exception stack threads through here.
   __cxa_exception *nextException;

   // How many nested handlers have caught this exception.  A negated
   // value is a signal that this object has been rethrown.
   int handlerCount;

 #ifdef __ARM_EABI_UNWINDER__
   // Stack of exceptions in cleanups.
   __cxa_exception* nextPropagatingException;

   // The number of active cleanup handlers for this exception.
   int propagationCount;
 #else
   // Cache parsed handler data from the personality routine Phase 1
   // for Phase 2 and __cxa_call_unexpected.
   int handlerSwitchValue;
   const unsigned char *actionRecord;
   const unsigned char *languageSpecificData;
   _Unwind_Ptr catchTemp;
   void *adjustedPtr;
 #endif

   // The generic exception header.  Must be last.
   _Unwind_Exception unwindHeader;
 };

 // Each thread in a C++ program has access to a __cxa_eh_globals object.
 struct __cxa_eh_globals
 {
   __cxa_exception *caughtExceptions;
   unsigned int uncaughtExceptions;
 #ifdef __ARM_EABI_UNWINDER__
   __cxa_exception* propagatingExceptions;
 #endif
 };

 // @@@ These are not directly specified by the IA-64 C++ ABI.

 // Handles re-checking the exception specification if unexpectedHandler
 // throws, and if bad_exception needs to be thrown.  Called from the
 // compiler.
 extern "C" void __cxa_call_unexpected (void *) __attribute__((__noreturn__));
 extern "C" void __cxa_call_terminate (void*) throw ()
   __attribute__((__noreturn__));

 #ifdef __ARM_EABI_UNWINDER__
 // Arm EABI specified routines.
 typedef enum {
   ctm_failed = 0,
   ctm_succeeded = 1,
   ctm_succeeded_with_ptr_to_base = 2
 } __cxa_type_match_result;
 extern "C" __cxa_type_match_result __cxa_type_match(_Unwind_Exception*,
 						    const std::type_info*,
 						    bool, void**);
 extern "C" bool __cxa_begin_cleanup (_Unwind_Exception*);
 extern "C" void __cxa_end_cleanup (void);
 #endif

 // Handles cleanup from transactional memory restart.
 extern "C" void __cxa_tm_cleanup (void *, void *, unsigned int) throw();

 // Invokes given handler, dying appropriately if the user handler was
 // so inconsiderate as to return.
 extern void __terminate(std::terminate_handler) throw ()
   __attribute__((__noreturn__));
 extern void __unexpected(std::terminate_handler)
   __attribute__((__noreturn__));

 // The current installed user handlers.
 extern std::terminate_handler __terminate_handler;
 extern std::terminate_handler __unexpected_handler;

 // These are explicitly GNU C++ specific.

 // Acquire the C++ exception header from the C++ object.
 static inline __cxa_exception *
 __get_exception_header_from_obj (void *ptr)
 {
   return reinterpret_cast<__cxa_exception *>(ptr) - 1;
 }

 // Acquire the C++ exception header from the generic exception header.
 static inline __cxa_exception *
 __get_exception_header_from_ue (_Unwind_Exception *exc)
 {
   return reinterpret_cast<__cxa_exception *>(exc + 1) - 1;
 }

 // Acquire the C++ refcounted exception header from the C++ object.
 static inline __cxa_refcounted_exception *
 __get_refcounted_exception_header_from_obj (void *ptr)
 {
   return reinterpret_cast<__cxa_refcounted_exception *>(ptr) - 1;
 }

 // Acquire the C++ refcounted exception header from the generic exception
 // header.
 static inline __cxa_refcounted_exception *
 __get_refcounted_exception_header_from_ue (_Unwind_Exception *exc)
 {
   return reinterpret_cast<__cxa_refcounted_exception *>(exc + 1) - 1;
 }

 static inline __cxa_dependent_exception *
 __get_dependent_exception_from_ue (_Unwind_Exception *exc)
 {
   return reinterpret_cast<__cxa_dependent_exception *>(exc + 1) - 1;
 }

 #ifdef __ARM_EABI_UNWINDER__
 static inline bool
 __is_gxx_exception_class(_Unwind_Exception_Class c)
 {
   // TODO: Take advantage of the fact that c will always be word aligned.
   return c[0] == 'G'
 	 && c[1] == 'N'
 	 && c[2] == 'U'
 	 && c[3] == 'C'
 	 && c[4] == 'C'
 	 && c[5] == '+'
 	 && c[6] == '+'
 	 && (c[7] == '\0' || c[7] == '\x01');
 }

 // Only checks for primary or dependent, but not that it is a C++ exception at
 // all.
 static inline bool
 __is_dependent_exception(_Unwind_Exception_Class c)
 {
   return c[7] == '\x01';
 }

 static inline void
 __GXX_INIT_PRIMARY_EXCEPTION_CLASS(_Unwind_Exception_Class c)
 {
   c[0] = 'G';
   c[1] = 'N';
   c[2] = 'U';
   c[3] = 'C';
   c[4] = 'C';
   c[5] = '+';
   c[6] = '+';
   c[7] = '\0';
 }

 static inline void
 __GXX_INIT_DEPENDENT_EXCEPTION_CLASS(_Unwind_Exception_Class c)
 {
   c[0] = 'G';
   c[1] = 'N';
   c[2] = 'U';
   c[3] = 'C';
   c[4] = 'C';
   c[5] = '+';
   c[6] = '+';
   c[7] = '\x01';
 }

 static inline bool
 __is_gxx_forced_unwind_class(_Unwind_Exception_Class c)
 {
   return c[0] == 'G'
 	 && c[1] == 'N'
 	 && c[2] == 'U'
 	 && c[3] == 'C'
 	 && c[4] == 'F'
 	 && c[5] == 'O'
 	 && c[6] == 'R'
 	 && c[7] == '\0';
 }

 static inline void
 __GXX_INIT_FORCED_UNWIND_CLASS(_Unwind_Exception_Class c)
 {
   c[0] = 'G';
   c[1] = 'N';
   c[2] = 'U';
   c[3] = 'C';
   c[4] = 'F';
   c[5] = 'O';
   c[6] = 'R';
   c[7] = '\0';
 }

 static inline void*
 __gxx_caught_object(_Unwind_Exception* eo)
 {
   return (void*)eo->barrier_cache.bitpattern[0];
 }
 #else // !__ARM_EABI_UNWINDER__
 // This is the primary exception class we report -- "GNUCC++\0".
 const _Unwind_Exception_Class __gxx_primary_exception_class
 = ((((((((_Unwind_Exception_Class) 'G'
 	 << 8 | (_Unwind_Exception_Class) 'N')
 	<< 8 | (_Unwind_Exception_Class) 'U')
        << 8 | (_Unwind_Exception_Class) 'C')
       << 8 | (_Unwind_Exception_Class) 'C')
      << 8 | (_Unwind_Exception_Class) '+')
     << 8 | (_Unwind_Exception_Class) '+')
    << 8 | (_Unwind_Exception_Class) '\0');

 // This is the dependent (from std::rethrow_exception) exception class we report
 // "GNUCC++\x01"
 const _Unwind_Exception_Class __gxx_dependent_exception_class
 = ((((((((_Unwind_Exception_Class) 'G'
 	 << 8 | (_Unwind_Exception_Class) 'N')
 	<< 8 | (_Unwind_Exception_Class) 'U')
        << 8 | (_Unwind_Exception_Class) 'C')
       << 8 | (_Unwind_Exception_Class) 'C')
      << 8 | (_Unwind_Exception_Class) '+')
     << 8 | (_Unwind_Exception_Class) '+')
    << 8 | (_Unwind_Exception_Class) '\x01');

 static inline bool
 __is_gxx_exception_class(_Unwind_Exception_Class c)
 {
   return c == __gxx_primary_exception_class
       || c == __gxx_dependent_exception_class;
 }

 // Only checks for primary or dependent, but not that it is a C++ exception at
 // all.
 static inline bool
 __is_dependent_exception(_Unwind_Exception_Class c)
 {
   return (c & 1);
 }

 #define __GXX_INIT_PRIMARY_EXCEPTION_CLASS(c) c = __gxx_primary_exception_class
 #define __GXX_INIT_DEPENDENT_EXCEPTION_CLASS(c) \
   c = __gxx_dependent_exception_class

 // GNU C++ personality routine, Version 0.
 extern "C" _Unwind_Reason_Code __gxx_personality_v0
      (int, _Unwind_Action, _Unwind_Exception_Class,
       struct _Unwind_Exception *, struct _Unwind_Context *);

 // GNU C++ sjlj personality routine, Version 0.
 extern "C" _Unwind_Reason_Code __gxx_personality_sj0
      (int, _Unwind_Action, _Unwind_Exception_Class,
       struct _Unwind_Exception *, struct _Unwind_Context *);

 static inline void*
 __gxx_caught_object(_Unwind_Exception* eo)
 {
   // Bad as it looks, this actually works for dependent exceptions too.
   __cxa_exception* header = __get_exception_header_from_ue (eo);
   return header->adjustedPtr;
 }
 #endif // !__ARM_EABI_UNWINDER__

 static inline void*
 __get_object_from_ue(_Unwind_Exception* eo) throw()
 {
   return __is_dependent_exception (eo->exception_class) ?
     __get_dependent_exception_from_ue (eo)->primaryException :
     eo + 1;
 }

 static inline void *
 __get_object_from_ambiguous_exception(__cxa_exception *p_or_d) throw()
 {
 	return __get_object_from_ue (&p_or_d->unwindHeader);
 }


 } /* namespace __cxxabiv1 */

 #pragma GCC visibility pop

 #endif // _UNWIND_CXX_H
	// -- C++ -- Exception handling and frame unwind runtime interface routines.
	// Copyright (C) 2001-2025 Free Software Foundation, Inc.
	//
	// This file is part of GCC.
	//
	// GCC is free software; you can redistribute it and/or modify
	// it under the terms of the GNU General Public License as published by
	// the Free Software Foundation; either version 3, or (at your option)
	// any later version.
	//
	// GCC is distributed in the hope that it will be useful,
	// but WITHOUT ANY WARRANTY; without even the implied warranty of
	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	// GNU General Public License for more details.
	//
	// Under Section 7 of GPL version 3, you are granted additional
	// permissions described in the GCC Runtime Library Exception, version
	// 3.1, as published by the Free Software Foundation.

	// You should have received a copy of the GNU General Public License and
	// a copy of the GCC Runtime Library Exception along with this program;
	// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
	// <http://www.gnu.org/licenses/>.

	// This is derived from the C++ ABI for IA-64. Where we diverge
	// for cross-architecture compatibility are noted with "@@@".

	#ifndef _UNWIND_CXX_H
	#define _UNWIND_CXX_H 1

	// Level 2: C++ ABI

	#include <typeinfo>
	#include <exception>
	#include <cstddef>
	#include "unwind.h"
	#include <bits/atomic_word.h>
	#include <cxxabi.h>

	#ifdef _GLIBCXX_HAVE_SYS_SDT_H
	#include <sys/sdt.h>
	/* We only want to use stap probes starting with v3. Earlier versions
	added too much startup cost. */
	#if defined (STAP_PROBE2) && _SDT_NOTE_TYPE >= 3
	#define PROBE2(name, arg1, arg2) STAP_PROBE2 (libstdcxx, name, arg1, arg2)
	#endif
	#endif

	#ifndef PROBE2
	#define PROBE2(name, arg1, arg2)
	#endif

	#pragma GCC visibility push(default)

	namespace __cxxabiv1
	{

	// A primary C++ exception object consists of a header, which is a wrapper
	// around an unwind object header with additional C++ specific information,
	// followed by the exception object itself.

	struct __cxa_exception
	{
	// Manage the exception object itself.
	std::type_info *exceptionType;
	void (_GLIBCXX_CDTOR_CALLABI exceptionDestructor)(void );

	// The C++ standard has entertaining rules wrt calling set_terminate
	// and set_unexpected in the middle of the exception cleanup process.
	std::terminate_handler unexpectedHandler;
	std::terminate_handler terminateHandler;

	// The caught exception stack threads through here.
	__cxa_exception *nextException;

	// How many nested handlers have caught this exception. A negated
	// value is a signal that this object has been rethrown.
	int handlerCount;

	#ifdef __ARM_EABI_UNWINDER__
	// Stack of exceptions in cleanups.
	__cxa_exception* nextPropagatingException;

	// The number of active cleanup handlers for this exception.
	int propagationCount;
	#else
	// Cache parsed handler data from the personality routine Phase 1
	// for Phase 2 and __cxa_call_unexpected.
	int handlerSwitchValue;
	const unsigned char *actionRecord;
	const unsigned char *languageSpecificData;
	_Unwind_Ptr catchTemp;
	void *adjustedPtr;
	#endif

	// The generic exception header. Must be last.
	_Unwind_Exception unwindHeader;
	};

	struct __cxa_refcounted_exception
	{
	// Manage this header.
	_Atomic_word referenceCount;
	// __cxa_exception must be last, and no padding can be after it.
	__cxa_exception exc;
	};

	// A dependent C++ exception object consists of a wrapper around an unwind
	// object header with additional C++ specific information, containing a pointer
	// to a primary exception object.

	struct __cxa_dependent_exception
	{
	// The primary exception this thing depends on.
	void *primaryException;

	// Unused member to get similar layout to __cxa_exception, otherwise the
	// alignment requirements of _Unwind_Exception would require padding bytes
	// before the unwindHeader member.
	void (_GLIBCXX_CDTOR_CALLABI __padding)(void );

	// The C++ standard has entertaining rules wrt calling set_terminate
	// and set_unexpected in the middle of the exception cleanup process.
	std::terminate_handler unexpectedHandler;
	std::terminate_handler terminateHandler;

	// The caught exception stack threads through here.
	__cxa_exception *nextException;

	// How many nested handlers have caught this exception. A negated
	// value is a signal that this object has been rethrown.
	int handlerCount;

	#ifdef __ARM_EABI_UNWINDER__
	// Stack of exceptions in cleanups.
	__cxa_exception* nextPropagatingException;

	// The number of active cleanup handlers for this exception.
	int propagationCount;
	#else
	// Cache parsed handler data from the personality routine Phase 1
	// for Phase 2 and __cxa_call_unexpected.
	int handlerSwitchValue;
	const unsigned char *actionRecord;
	const unsigned char *languageSpecificData;
	_Unwind_Ptr catchTemp;
	void *adjustedPtr;
	#endif

	// The generic exception header. Must be last.
	_Unwind_Exception unwindHeader;
	};

	// Each thread in a C++ program has access to a __cxa_eh_globals object.
	struct __cxa_eh_globals
	{
	__cxa_exception *caughtExceptions;
	unsigned int uncaughtExceptions;
	#ifdef __ARM_EABI_UNWINDER__
	__cxa_exception* propagatingExceptions;
	#endif
	};

	// @@@ These are not directly specified by the IA-64 C++ ABI.

	// Handles re-checking the exception specification if unexpectedHandler
	// throws, and if bad_exception needs to be thrown. Called from the
	// compiler.
	extern "C" void __cxa_call_unexpected (void *) __attribute__((__noreturn__));
	extern "C" void __cxa_call_terminate (void*) throw ()
	__attribute__((__noreturn__));

	#ifdef __ARM_EABI_UNWINDER__
	// Arm EABI specified routines.
	typedef enum {
	ctm_failed = 0,
	ctm_succeeded = 1,
	ctm_succeeded_with_ptr_to_base = 2
	} __cxa_type_match_result;
	extern "C" __cxa_type_match_result __cxa_type_match(_Unwind_Exception*,
	const std::type_info*,
	bool, void**);
	extern "C" bool __cxa_begin_cleanup (_Unwind_Exception*);
	extern "C" void __cxa_end_cleanup (void);
	#endif

	// Handles cleanup from transactional memory restart.
	extern "C" void __cxa_tm_cleanup (void , void , unsigned int) throw();

	// Invokes given handler, dying appropriately if the user handler was
	// so inconsiderate as to return.
	extern void __terminate(std::terminate_handler) throw ()
	__attribute__((__noreturn__));
	extern void __unexpected(std::terminate_handler)
	__attribute__((__noreturn__));

	// The current installed user handlers.
	extern std::terminate_handler __terminate_handler;
	extern std::terminate_handler __unexpected_handler;

	// These are explicitly GNU C++ specific.

	// Acquire the C++ exception header from the C++ object.
	static inline __cxa_exception *
	__get_exception_header_from_obj (void *ptr)
	{
	return reinterpret_cast<__cxa_exception *>(ptr) - 1;
	}

	// Acquire the C++ exception header from the generic exception header.
	static inline __cxa_exception *
	__get_exception_header_from_ue (_Unwind_Exception *exc)
	{
	return reinterpret_cast<__cxa_exception *>(exc + 1) - 1;
	}

	// Acquire the C++ refcounted exception header from the C++ object.
	static inline __cxa_refcounted_exception *
	__get_refcounted_exception_header_from_obj (void *ptr)
	{
	return reinterpret_cast<__cxa_refcounted_exception *>(ptr) - 1;
	}

	// Acquire the C++ refcounted exception header from the generic exception
	// header.
	static inline __cxa_refcounted_exception *
	__get_refcounted_exception_header_from_ue (_Unwind_Exception *exc)
	{
	return reinterpret_cast<__cxa_refcounted_exception *>(exc + 1) - 1;
	}

	static inline __cxa_dependent_exception *
	__get_dependent_exception_from_ue (_Unwind_Exception *exc)
	{
	return reinterpret_cast<__cxa_dependent_exception *>(exc + 1) - 1;
	}

	#ifdef __ARM_EABI_UNWINDER__
	static inline bool
	__is_gxx_exception_class(_Unwind_Exception_Class c)
	{
	// TODO: Take advantage of the fact that c will always be word aligned.
	return c[0] == 'G'
	&& c[1] == 'N'
	&& c[2] == 'U'
	&& c[3] == 'C'
	&& c[4] == 'C'
	&& c[5] == '+'
	&& c[6] == '+'
	&& (c[7] == '\0' \|\| c[7] == '\x01');
	}

	// Only checks for primary or dependent, but not that it is a C++ exception at
	// all.
	static inline bool
	__is_dependent_exception(_Unwind_Exception_Class c)
	{
	return c[7] == '\x01';
	}

	static inline void
	__GXX_INIT_PRIMARY_EXCEPTION_CLASS(_Unwind_Exception_Class c)
	{
	c[0] = 'G';
	c[1] = 'N';
	c[2] = 'U';
	c[3] = 'C';
	c[4] = 'C';
	c[5] = '+';
	c[6] = '+';
	c[7] = '\0';
	}

	static inline void
	__GXX_INIT_DEPENDENT_EXCEPTION_CLASS(_Unwind_Exception_Class c)
	{
	c[0] = 'G';
	c[1] = 'N';
	c[2] = 'U';
	c[3] = 'C';
	c[4] = 'C';
	c[5] = '+';
	c[6] = '+';
	c[7] = '\x01';
	}

	static inline bool
	__is_gxx_forced_unwind_class(_Unwind_Exception_Class c)
	{
	return c[0] == 'G'
	&& c[1] == 'N'
	&& c[2] == 'U'
	&& c[3] == 'C'
	&& c[4] == 'F'
	&& c[5] == 'O'
	&& c[6] == 'R'
	&& c[7] == '\0';
	}

	static inline void
	__GXX_INIT_FORCED_UNWIND_CLASS(_Unwind_Exception_Class c)
	{
	c[0] = 'G';
	c[1] = 'N';
	c[2] = 'U';
	c[3] = 'C';
	c[4] = 'F';
	c[5] = 'O';
	c[6] = 'R';
	c[7] = '\0';
	}

	static inline void*
	__gxx_caught_object(_Unwind_Exception* eo)
	{
	return (void*)eo->barrier_cache.bitpattern[0];
	}
	#else // !__ARM_EABI_UNWINDER__
	// This is the primary exception class we report -- "GNUCC++\0".
	const _Unwind_Exception_Class __gxx_primary_exception_class
	= ((((((((_Unwind_Exception_Class) 'G'
	<< 8 \| (_Unwind_Exception_Class) 'N')
	<< 8 \| (_Unwind_Exception_Class) 'U')
	<< 8 \| (_Unwind_Exception_Class) 'C')
	<< 8 \| (_Unwind_Exception_Class) 'C')
	<< 8 \| (_Unwind_Exception_Class) '+')
	<< 8 \| (_Unwind_Exception_Class) '+')
	<< 8 \| (_Unwind_Exception_Class) '\0');

	// This is the dependent (from std::rethrow_exception) exception class we report
	// "GNUCC++\x01"
	const _Unwind_Exception_Class __gxx_dependent_exception_class
	= ((((((((_Unwind_Exception_Class) 'G'
	<< 8 \| (_Unwind_Exception_Class) 'N')
	<< 8 \| (_Unwind_Exception_Class) 'U')
	<< 8 \| (_Unwind_Exception_Class) 'C')
	<< 8 \| (_Unwind_Exception_Class) 'C')
	<< 8 \| (_Unwind_Exception_Class) '+')
	<< 8 \| (_Unwind_Exception_Class) '+')
	<< 8 \| (_Unwind_Exception_Class) '\x01');

	static inline bool
	__is_gxx_exception_class(_Unwind_Exception_Class c)
	{
	return c == __gxx_primary_exception_class
	\|\| c == __gxx_dependent_exception_class;
	}

	// Only checks for primary or dependent, but not that it is a C++ exception at
	// all.
	static inline bool
	__is_dependent_exception(_Unwind_Exception_Class c)
	{
	return (c & 1);
	}

	#define __GXX_INIT_PRIMARY_EXCEPTION_CLASS(c) c = __gxx_primary_exception_class
	#define __GXX_INIT_DEPENDENT_EXCEPTION_CLASS(c) \
	c = __gxx_dependent_exception_class

	// GNU C++ personality routine, Version 0.
	extern "C" _Unwind_Reason_Code __gxx_personality_v0
	(int, _Unwind_Action, _Unwind_Exception_Class,
	struct _Unwind_Exception , struct _Unwind_Context );

	// GNU C++ sjlj personality routine, Version 0.
	extern "C" _Unwind_Reason_Code __gxx_personality_sj0
	(int, _Unwind_Action, _Unwind_Exception_Class,
	struct _Unwind_Exception , struct _Unwind_Context );

	static inline void*
	__gxx_caught_object(_Unwind_Exception* eo)
	{
	// Bad as it looks, this actually works for dependent exceptions too.
	__cxa_exception* header = __get_exception_header_from_ue (eo);
	return header->adjustedPtr;
	}
	#endif // !__ARM_EABI_UNWINDER__

	static inline void*
	__get_object_from_ue(_Unwind_Exception* eo) throw()
	{
	return __is_dependent_exception (eo->exception_class) ?
	__get_dependent_exception_from_ue (eo)->primaryException :
	eo + 1;
	}

	static inline void *
	__get_object_from_ambiguous_exception(__cxa_exception *p_or_d) throw()
	{
	return __get_object_from_ue (&p_or_d->unwindHeader);
	}


	} /* namespace __cxxabiv1 */

	#pragma GCC visibility pop

	#endif // _UNWIND_CXX_H