172 lines
6.1 KiB
C++
172 lines
6.1 KiB
C++
// -*- C++ -*- Exception handling and frame unwind runtime interface routines.
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// Copyright (C) 2001 Free Software Foundation, Inc.
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//
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// This file is part of GCC.
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//
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// GCC is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2, or (at your option)
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// any later version.
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//
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// GCC is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with GCC; see the file COPYING. If not, write to
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// the Free Software Foundation, 59 Temple Place - Suite 330,
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// Boston, MA 02111-1307, USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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// This is derived from the C++ ABI for IA-64. Where we diverge
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// for cross-architecture compatibility are noted with "@@@".
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#ifndef _UNWIND_CXX_H
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#define _UNWIND_CXX_H 1
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// Level 2: C++ ABI
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#include <typeinfo>
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#include <exception>
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#include <cstddef>
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#include "unwind.h"
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namespace __cxxabiv1
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{
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// A C++ exception object consists of a header, which is a wrapper around
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// an unwind object header with additional C++ specific information,
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// followed by the exception object itself.
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struct __cxa_exception
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{
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// Manage the exception object itself.
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std::type_info *exceptionType;
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void (*exceptionDestructor)(void *);
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// The C++ standard has entertaining rules wrt calling set_terminate
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// and set_unexpected in the middle of the exception cleanup process.
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std::unexpected_handler unexpectedHandler;
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std::terminate_handler terminateHandler;
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// The caught exception stack threads through here.
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__cxa_exception *nextException;
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// How many nested handlers have caught this exception. A negated
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// value is a signal that this object has been rethrown.
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int handlerCount;
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// Cache parsed handler data from the personality routine Phase 1
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// for Phase 2 and __cxa_call_unexpected.
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int handlerSwitchValue;
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const unsigned char *actionRecord;
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const unsigned char *languageSpecificData;
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_Unwind_Ptr catchTemp;
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void *adjustedPtr;
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// The generic exception header. Must be last.
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_Unwind_Exception unwindHeader;
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};
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// Each thread in a C++ program has access to a __cxa_eh_globals object.
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struct __cxa_eh_globals
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{
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__cxa_exception *caughtExceptions;
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unsigned int uncaughtExceptions;
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};
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// The __cxa_eh_globals for the current thread can be obtained by using
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// either of the following functions. The "fast" version assumes at least
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// one prior call of __cxa_get_globals has been made from the current
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// thread, so no initialization is necessary.
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extern "C" __cxa_eh_globals *__cxa_get_globals () throw();
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extern "C" __cxa_eh_globals *__cxa_get_globals_fast () throw();
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// Allocate memory for the exception plus the thown object.
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extern "C" void *__cxa_allocate_exception(std::size_t thrown_size) throw();
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// Free the space allocated for the exception.
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extern "C" void __cxa_free_exception(void *thrown_exception) throw();
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// Throw the exception.
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extern "C" void __cxa_throw (void *thrown_exception,
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std::type_info *tinfo,
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void (*dest) (void *))
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__attribute__((noreturn));
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// Used to implement exception handlers.
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extern "C" void *__cxa_begin_catch (void *) throw();
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extern "C" void __cxa_end_catch ();
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extern "C" void __cxa_rethrow () __attribute__((noreturn));
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// These facilitate code generation for recurring situations.
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extern "C" void __cxa_bad_cast ();
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extern "C" void __cxa_bad_typeid ();
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// @@@ These are not directly specified by the IA-64 C++ ABI.
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// Handles re-checking the exception specification if unexpectedHandler
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// throws, and if bad_exception needs to be thrown. Called from the
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// compiler.
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extern "C" void __cxa_call_unexpected (void *) __attribute__((noreturn));
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// Invokes given handler, dying appropriately if the user handler was
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// so inconsiderate as to return.
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extern void __terminate(std::terminate_handler) __attribute__((noreturn));
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extern void __unexpected(std::unexpected_handler) __attribute__((noreturn));
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// The current installed user handlers.
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extern std::terminate_handler __terminate_handler;
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extern std::unexpected_handler __unexpected_handler;
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// These are explicitly GNU C++ specific.
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// This is the exception class we report -- "GNUCC++\0".
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const _Unwind_Exception_Class __gxx_exception_class
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= ((((((((_Unwind_Exception_Class) 'G'
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<< 8 | (_Unwind_Exception_Class) 'N')
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<< 8 | (_Unwind_Exception_Class) 'U')
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<< 8 | (_Unwind_Exception_Class) 'C')
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<< 8 | (_Unwind_Exception_Class) 'C')
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<< 8 | (_Unwind_Exception_Class) '+')
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<< 8 | (_Unwind_Exception_Class) '+')
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<< 8 | (_Unwind_Exception_Class) '\0');
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// GNU C++ personality routine, Version 0.
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extern "C" _Unwind_Reason_Code __gxx_personality_v0
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(int, _Unwind_Action, _Unwind_Exception_Class,
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struct _Unwind_Exception *, struct _Unwind_Context *);
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// GNU C++ sjlj personality routine, Version 0.
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extern "C" _Unwind_Reason_Code __gxx_personality_sj0
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(int, _Unwind_Action, _Unwind_Exception_Class,
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struct _Unwind_Exception *, struct _Unwind_Context *);
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// Acquire the C++ exception header from the C++ object.
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static inline __cxa_exception *
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__get_exception_header_from_obj (void *ptr)
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{
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return reinterpret_cast<__cxa_exception *>(ptr) - 1;
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}
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// Acquire the C++ exception header from the generic exception header.
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static inline __cxa_exception *
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__get_exception_header_from_ue (_Unwind_Exception *exc)
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{
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return reinterpret_cast<__cxa_exception *>(exc + 1) - 1;
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}
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} /* namespace __cxxabiv1 */
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#endif // _UNWIND_CXX_H
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