mirror of git://gcc.gnu.org/git/gcc.git
383 lines
11 KiB
C++
383 lines
11 KiB
C++
// -*- C++ -*- Exception handling and frame unwind runtime interface routines.
|
|
// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
|
|
// 2011 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>
|
|
|
|
#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::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;
|
|
|
|
#ifdef __ARM_EABI_UNWINDER__
|
|
// Stack of exceptions in cleanups.
|
|
__cxa_exception* nextPropagatingException;
|
|
|
|
// The nuber 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;
|
|
|
|
// 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;
|
|
|
|
#ifdef __ARM_EABI_UNWINDER__
|
|
// Stack of exceptions in cleanups.
|
|
__cxa_exception* nextPropagatingException;
|
|
|
|
// The nuber 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 (_Unwind_Exception*) 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::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.
|
|
|
|
// 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
|