173 lines
6.2 KiB
C++
173 lines
6.2 KiB
C++
// -*- 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 (_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
|