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Whole document tree                   unwind-cxx.h Go to the documentation of this file. // -*- C++ -*- Exception handling and frame unwind runtime interface routines. // Copyright (C) 2001 Free Software Foundation, Inc. // // This file is part of GNU CC. // // GNU CC 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 2, or (at your option) // any later version. // // GNU CC 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. // // You should have received a copy of the GNU General Public License // along with GNU CC; see the file COPYING. If not, write to // the Free Software Foundation, 59 Temple Place - Suite 330, // Boston, MA 02111-1307, USA. // 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" namespace __cxxabiv1 { // A 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 (*exceptionDestructor)(void *); // The C++ standard has entertaining rules wrt calling set_terminate // and set_unexpected in the middle of the exception cleanup process. std::unexpected_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; // 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; void *catchTemp; void *adjustedPtr; // 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; }; // The __cxa_eh_globals for the current thread can be obtained by using // either of the following functions. The "fast" version assumes at least // one prior call of __cxa_get_globals has been made from the current // thread, so no initialization is necessary. extern "C" __cxa_eh_globals *__cxa_get_globals () throw(); extern "C" __cxa_eh_globals *__cxa_get_globals_fast () throw(); // Allocate memory for the exception plus the thown object. extern "C" void *__cxa_allocate_exception(std::size_t thrown_size) throw(); // Free the space allocated for the exception. extern "C" void __cxa_free_exception(void *thrown_exception) throw(); // Throw the exception. extern "C" void __cxa_throw (void *thrown_exception, std::type_info *tinfo, void (*dest) (void *)) __attribute__((noreturn)); // Used to implement exception handlers. extern "C" void *__cxa_begin_catch (_Unwind_Exception *) throw(); extern "C" void __cxa_end_catch (); extern "C" void __cxa_rethrow () __attribute__((noreturn)); // These facilitate code generation for recurring situations. extern "C" void __cxa_bad_cast (); extern "C" void __cxa_bad_typeid (); // @@@ 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 (_Unwind_Exception *) __attribute__((noreturn)); // Invokes given handler, dying appropriately if the user handler was // so inconsiderate as to return. extern void __terminate(std::terminate_handler) __attribute__((noreturn)); extern void __unexpected(std::unexpected_handler) __attribute__((noreturn)); // The current installed user handlers. extern std::terminate_handler __terminate_handler; extern std::unexpected_handler __unexpected_handler; // These are explicitly GNU C++ specific. // This is the exception class we report -- "GNUCC++\0". const _Unwind_Exception_Class __gxx_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'); // 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 *); // 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; } } /* namespace __cxxabiv1 */ #endif // __UNWIND_CXX_H