diff options
Diffstat (limited to 'contrib/libstdc++/libsupc++/unwind-cxx.h')
-rw-r--r-- | contrib/libstdc++/libsupc++/unwind-cxx.h | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/contrib/libstdc++/libsupc++/unwind-cxx.h b/contrib/libstdc++/libsupc++/unwind-cxx.h new file mode 100644 index 0000000..ea30eba --- /dev/null +++ b/contrib/libstdc++/libsupc++/unwind-cxx.h @@ -0,0 +1,171 @@ +// -*- 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. + +// As a special exception, you may use this file as part of a free software +// library without restriction. Specifically, if other files instantiate +// templates or use macros or inline functions from this file, or you compile +// this file and link it with other files to produce an executable, this +// file does not by itself cause the resulting executable to be covered by +// the GNU General Public License. This exception does not however +// invalidate any other reasons why the executable file might be covered by +// the GNU General Public License. + +// 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 (void *) 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 (void *) __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 |