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Re-instate last patch...

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2008-08-13  Paolo Carlini  <paolo.carlini@oracle.com>

	Re-instate last patch, amended to use __exchange_and_add_dispatch
	and __atomic_add_dispatch in eh_ptr.cc and eh_throw.cc.

From-SVN: r139091
This commit is contained in:
Paolo Carlini 2008-08-14 01:17:09 +00:00 committed by Paolo Carlini
parent 23a9a619f7
commit 6d419a6ef3
17 changed files with 1084 additions and 43 deletions
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5
libstdc++-v3/ChangeLog
View File

@ -1,3 +1,8 @@
2008-08-13 Paolo Carlini <paolo.carlini@oracle.com>
Re-instate last patch, amended to use __exchange_and_add_dispatch
and __atomic_add_dispatch in eh_ptr.cc and eh_throw.cc.
2008-08-13 Paolo Carlini <paolo.carlini@oracle.com>
Revert the last patch.

29
libstdc++-v3/config/abi/pre/gnu.ver
View File

@ -66,7 +66,9 @@ GLIBCXX_3.4 {
# std::condition_variable;
std::co[^n]*;
std::c[p-s]*;
std::c[u-z]*;
std::cu[^r]*;
# std::current_exception
std::c[v-z]*;
# std::[d-g]*;
std::d[a-d]*;
std::d[f-z]*;
@ -112,10 +114,13 @@ GLIBCXX_3.4 {
std::n[^au]*;
std::nu[^m]*;
std::num[^e]*;
std::[p-r]*;
std::ostrstream*;
std::out_of_range*;
std::overflow_error*;
std::[p-q]*;
std::r[^e]*;
std::re[^t]*;
# std::rethrow_exception
std::set_new_handler*;
std::set_terminate*;
std::set_unexpected*;
@ -1047,4 +1052,24 @@ CXXABI_1.3.3 {
_ZTIPu8char32_t;
_ZTIPKu8char32_t;
# exception_ptr
_ZNSt15__exception_ptr13exception_ptrC1Ev;
_ZNSt15__exception_ptr13exception_ptrC2Ev;
_ZNSt15__exception_ptr13exception_ptrC1ERKS0_;
_ZNSt15__exception_ptr13exception_ptrC2ERKS0_;
_ZNSt15__exception_ptr13exception_ptrC1EMS0_FvvE;
_ZNSt15__exception_ptr13exception_ptrC2EMS0_FvvE;
_ZNSt15__exception_ptr13exception_ptrD1Ev;
_ZNSt15__exception_ptr13exception_ptrD2Ev;
_ZNSt15__exception_ptr13exception_ptraSERKS0_;
_ZNKSt15__exception_ptr13exception_ptrcvMS0_FvvEEv;
_ZNKSt15__exception_ptr13exception_ptrntEv;
_ZNKSt15__exception_ptr13exception_ptr20__cxa_exception_typeEv;
_ZNSt15__exception_ptr13exception_ptr4swapERS0_;
_ZNSt15__exception_ptreqERKNS_13exception_ptrES2_;
_ZNSt15__exception_ptrneERKNS_13exception_ptrES2_;
_ZSt17current_exceptionv;
_ZSt17rethrow_exceptionNSt15__exception_ptr13exception_ptrE;
} CXXABI_1.3.2;

3
libstdc++-v3/libsupc++/Makefile.am
View File

@ -34,7 +34,7 @@ noinst_LTLIBRARIES = libsupc++convenience.la
headers = \
exception new typeinfo cxxabi.h cxxabi-forced.h exception_defines.h \
initializer_list
initializer_list exception_ptr.h
if GLIBCXX_HOSTED
c_sources = \
@ -60,6 +60,7 @@ sources = \
eh_exception.cc \
eh_globals.cc \
eh_personality.cc \
eh_ptr.cc \
eh_term_handler.cc \
eh_terminate.cc \
eh_throw.cc \

9
libstdc++-v3/libsupc++/Makefile.in
View File

@ -79,7 +79,7 @@ am__libsupc___la_SOURCES_DIST = array_type_info.cc atexit_arm.cc \
bad_cast.cc bad_typeid.cc class_type_info.cc del_op.cc \
del_opnt.cc del_opv.cc del_opvnt.cc dyncast.cc eh_alloc.cc \
eh_arm.cc eh_aux_runtime.cc eh_call.cc eh_catch.cc \
eh_exception.cc eh_globals.cc eh_personality.cc \
eh_exception.cc eh_globals.cc eh_personality.cc eh_ptr.cc \
eh_term_handler.cc eh_terminate.cc eh_throw.cc eh_type.cc \
eh_unex_handler.cc enum_type_info.cc function_type_info.cc \
fundamental_type_info.cc guard.cc new_handler.cc new_op.cc \
@ -91,7 +91,7 @@ am__objects_1 = array_type_info.lo atexit_arm.lo bad_cast.lo \
bad_typeid.lo class_type_info.lo del_op.lo del_opnt.lo \
del_opv.lo del_opvnt.lo dyncast.lo eh_alloc.lo eh_arm.lo \
eh_aux_runtime.lo eh_call.lo eh_catch.lo eh_exception.lo \
eh_globals.lo eh_personality.lo eh_term_handler.lo \
eh_globals.lo eh_personality.lo eh_ptr.lo eh_term_handler.lo \
eh_terminate.lo eh_throw.lo eh_type.lo eh_unex_handler.lo \
enum_type_info.lo function_type_info.lo \
fundamental_type_info.lo guard.lo new_handler.lo new_op.lo \
@ -107,7 +107,7 @@ am__libsupc__convenience_la_SOURCES_DIST = array_type_info.cc \
atexit_arm.cc bad_cast.cc bad_typeid.cc class_type_info.cc \
del_op.cc del_opnt.cc del_opv.cc del_opvnt.cc dyncast.cc \
eh_alloc.cc eh_arm.cc eh_aux_runtime.cc eh_call.cc eh_catch.cc \
eh_exception.cc eh_globals.cc eh_personality.cc \
eh_exception.cc eh_globals.cc eh_personality.cc eh_ptr.cc \
eh_term_handler.cc eh_terminate.cc eh_throw.cc eh_type.cc \
eh_unex_handler.cc enum_type_info.cc function_type_info.cc \
fundamental_type_info.cc guard.cc new_handler.cc new_op.cc \
@ -356,7 +356,7 @@ toolexeclib_LTLIBRARIES = libsupc++.la
noinst_LTLIBRARIES = libsupc++convenience.la
headers = \
exception new typeinfo cxxabi.h cxxabi-forced.h exception_defines.h \
initializer_list
initializer_list exception_ptr.h
@GLIBCXX_HOSTED_TRUE@c_sources = \
@GLIBCXX_HOSTED_TRUE@ cp-demangle.c
@ -380,6 +380,7 @@ sources = \
eh_exception.cc \
eh_globals.cc \
eh_personality.cc \
eh_ptr.cc \
eh_term_handler.cc \
eh_terminate.cc \
eh_throw.cc \

68
libstdc++-v3/libsupc++/eh_alloc.cc
View File

@ -1,5 +1,5 @@
// -*- C++ -*- Allocate exception objects.
// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006
// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2008
// Free Software Foundation, Inc.
//
// This file is part of GCC.
@ -89,6 +89,9 @@ typedef char one_buffer[EMERGENCY_OBJ_SIZE] __attribute__((aligned));
static one_buffer emergency_buffer[EMERGENCY_OBJ_COUNT];
static bitmask_type emergency_used;
static __cxa_dependent_exception dependents_buffer[EMERGENCY_OBJ_COUNT];
static bitmask_type dependents_used;
namespace
{
// A single mutex controlling emergency allocations.
@ -157,3 +160,66 @@ __cxxabiv1::__cxa_free_exception(void *vptr) throw()
else
free (ptr - sizeof (__cxa_exception));
}
extern "C" __cxa_dependent_exception*
__cxxabiv1::__cxa_allocate_dependent_exception() throw()
{
__cxa_dependent_exception *ret;
ret = static_cast<__cxa_dependent_exception*>
(malloc (sizeof (__cxa_dependent_exception)));
if (!ret)
{
__gnu_cxx::__scoped_lock sentry(emergency_mutex);
bitmask_type used = dependents_used;
unsigned int which = 0;
while (used & 1)
{
used >>= 1;
if (++which >= EMERGENCY_OBJ_COUNT)
goto failed;
}
dependents_used |= (bitmask_type)1 << which;
ret = &dependents_buffer[which];
failed:;
if (!ret)
std::terminate ();
}
// We have an uncaught exception as soon as we allocate memory. This
// yields uncaught_exception() true during the copy-constructor that
// initializes the exception object. See Issue 475.
__cxa_eh_globals *globals = __cxa_get_globals ();
globals->uncaughtExceptions += 1;
memset (ret, 0, sizeof (__cxa_dependent_exception));
return ret;
}
extern "C" void
__cxxabiv1::__cxa_free_dependent_exception
(__cxa_dependent_exception *vptr) throw()
{
char *base = (char *) dependents_buffer;
char *ptr = (char *) vptr;
if (ptr >= base
&& ptr < base + sizeof (dependents_buffer))
{
const unsigned int which
= (unsigned) (ptr - base) / sizeof (__cxa_dependent_exception);
__gnu_cxx::__scoped_lock sentry(emergency_mutex);
dependents_used &= ~((bitmask_type)1 << which);
}
else
free (vptr);
}

8
libstdc++-v3/libsupc++/eh_arm.cc
View File

@ -1,5 +1,5 @@
// -*- C++ -*- ARM specific Exception handling support routines.
// Copyright (C) 2004, 2005 Free Software Foundation, Inc.
// Copyright (C) 2004, 2005, 2008 Free Software Foundation, Inc.
//
// This file is part of GCC.
//
@ -48,13 +48,19 @@ __cxa_type_match(_Unwind_Exception* ue_header,
{
bool forced_unwind = __is_gxx_forced_unwind_class(ue_header->exception_class);
bool foreign_exception = !forced_unwind && !__is_gxx_exception_class(ue_header->exception_class);
bool dependent_exception =
__is_dependent_exception(ue_header->exception_class);
__cxa_exception* xh = __get_exception_header_from_ue(ue_header);
__cxa_dependent_exception *dx = __get_dependent_exception_from_ue(ue_header);
const std::type_info* throw_type;
if (forced_unwind)
throw_type = &typeid(abi::__forced_unwind);
else if (foreign_exception)
throw_type = &typeid(abi::__foreign_exception);
else if (dependent_exception)
throw_type = __get_exception_header_from_obj
(dx->primaryException)->exceptionType;
else
throw_type = xh->exceptionType;

4
libstdc++-v3/libsupc++/eh_call.cc
View File

@ -1,5 +1,5 @@
// -*- C++ -*- Helpers for calling unextected and terminate
// Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
// Copyright (C) 2001, 2002, 2003, 2008 Free Software Foundation, Inc.
//
// This file is part of GCC.
//
@ -125,7 +125,7 @@ __cxa_call_unexpected(void* exc_obj_in)
__cxa_eh_globals* globals = __cxa_get_globals_fast();
__cxa_exception* new_xh = globals->caughtExceptions;
void* new_ptr = new_xh + 1;
void* new_ptr = __gxx_get_object_from_ambiguous_exception (new_xh);
const std::type_info* catch_type;
int n;
bool bad_exception_allowed = false;

22
libstdc++-v3/libsupc++/eh_personality.cc
View File

@ -377,7 +377,7 @@ PERSONALITY_FUNCTION (int version,
const unsigned char *p;
_Unwind_Ptr landing_pad, ip;
int handler_switch_value;
void* thrown_ptr = ue_header + 1;
void* thrown_ptr = 0;
bool foreign_exception;
int ip_before_insn = 0;
@ -543,30 +543,33 @@ PERSONALITY_FUNCTION (int version,
bool saw_handler = false;
#ifdef __ARM_EABI_UNWINDER__
// ??? How does this work - more importantly, how does it interact with
// dependent exceptions?
throw_type = ue_header;
if (actions & _UA_FORCE_UNWIND)
{
__GXX_INIT_FORCED_UNWIND_CLASS(ue_header->exception_class);
thrown_ptr = 0;
}
else if (foreign_exception)
thrown_ptr = 0;
else if (!foreign_exception)
thrown_ptr = __get_object_from_ue (ue_header);
#else
// During forced unwinding, match a magic exception type.
if (actions & _UA_FORCE_UNWIND)
{
throw_type = &typeid(abi::__forced_unwind);
thrown_ptr = 0;
}
// With a foreign exception class, there's no exception type.
// ??? What to do about GNU Java and GNU Ada exceptions?
else if (foreign_exception)
{
throw_type = &typeid(abi::__foreign_exception);
thrown_ptr = 0;
}
else
throw_type = xh->exceptionType;
{
thrown_ptr = __get_object_from_ue (ue_header);
throw_type = __get_exception_header_from_obj
(thrown_ptr)->exceptionType;
}
#endif
while (1)
@ -758,13 +761,14 @@ __cxa_call_unexpected (void *exc_obj_in)
__cxa_eh_globals *globals = __cxa_get_globals_fast ();
__cxa_exception *new_xh = globals->caughtExceptions;
void *new_ptr = new_xh + 1;
void *new_ptr = __get_object_from_ambiguous_exception (new_xh);
// We don't quite have enough stuff cached; re-parse the LSDA.
parse_lsda_header (0, xh_lsda, &info);
// If this new exception meets the exception spec, allow it.
if (check_exception_spec (&info, new_xh->exceptionType,
if (check_exception_spec (&info, __get_exception_header_from_obj
(new_ptr)->exceptionType,
new_ptr, xh_switch_value))
__throw_exception_again;

236
libstdc++-v3/libsupc++/eh_ptr.cc Normal file
View File

@ -0,0 +1,236 @@
// -*- C++ -*- Implement the members of exception_ptr.
// Copyright (C) 2008 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 2, 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.
//
// You should have received a copy of the GNU General Public License
// along with GCC; see the file COPYING. If not, write to
// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
// Boston, MA 02110-1301, 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.
#include <bits/c++config.h>
#include <exception>
#include <exception_ptr.h>
#include "unwind-cxx.h"
using namespace __cxxabiv1;
std::__exception_ptr::exception_ptr::exception_ptr() throw()
: _M_exception_object(0)
{
}
std::__exception_ptr::exception_ptr::exception_ptr(void* obj) throw()
: _M_exception_object(obj)
{
_M_addref();
}
std::__exception_ptr::exception_ptr::exception_ptr(__safe_bool) throw()
: _M_exception_object(0)
{
}
std::__exception_ptr::exception_ptr::exception_ptr(
const exception_ptr& other) throw()
: _M_exception_object(other._M_exception_object)
{
_M_addref();
}
std::__exception_ptr::exception_ptr::~exception_ptr() throw()
{
_M_release();
}
std::__exception_ptr::exception_ptr&
std::__exception_ptr::exception_ptr::operator=(
const exception_ptr& other) throw()
{
exception_ptr(other).swap(*this);
return *this;
}
void
std::__exception_ptr::exception_ptr::_M_addref() throw()
{
if (_M_exception_object)
{
__cxa_exception *eh =
__get_exception_header_from_obj (_M_exception_object);
__gnu_cxx::__atomic_add_dispatch (&eh->referenceCount, 1);
}
}
void
std::__exception_ptr::exception_ptr::_M_release() throw()
{
if (_M_exception_object)
{
__cxa_exception *eh =
__get_exception_header_from_obj (_M_exception_object);
if (__gnu_cxx::__exchange_and_add_dispatch (&eh->referenceCount, -1) == 0)
{
if (eh->exceptionDestructor)
eh->exceptionDestructor (_M_exception_object);
__cxa_free_exception (_M_exception_object);
_M_exception_object = 0;
}
}
}
void*
std::__exception_ptr::exception_ptr::_M_get() const throw()
{
return _M_exception_object;
}
void
std::__exception_ptr::exception_ptr::_M_safe_bool_dummy()
{
}
void
std::__exception_ptr::exception_ptr::swap(exception_ptr &other) throw()
{
void *tmp = _M_exception_object;
_M_exception_object = other._M_exception_object;
other._M_exception_object = tmp;
}
bool
std::__exception_ptr::exception_ptr::operator!() const throw()
{
return _M_exception_object == 0;
}
std::__exception_ptr::exception_ptr::operator __safe_bool() const throw()
{
return _M_exception_object ? &exception_ptr::_M_safe_bool_dummy : 0;
}
const std::type_info*
std::__exception_ptr::exception_ptr::__cxa_exception_type() const throw()
{
__cxa_exception *eh = __get_exception_header_from_obj (_M_exception_object);
return eh->exceptionType;
}
bool std::__exception_ptr::operator==(const exception_ptr& lhs,
const exception_ptr& rhs) throw()
{
return lhs._M_exception_object == rhs._M_exception_object;
}
bool std::__exception_ptr::operator!=(const exception_ptr& lhs,
const exception_ptr& rhs) throw()
{
return !(lhs == rhs);
}
std::exception_ptr
std::current_exception() throw()
{
__cxa_eh_globals *globals = __cxa_get_globals ();
__cxa_exception *header = globals->caughtExceptions;
if (!header)
return std::exception_ptr();
// Since foreign exceptions can't be counted, we can't return them.
if (!__is_gxx_exception_class (header->unwindHeader.exception_class))
return std::exception_ptr();
return std::exception_ptr(
__get_object_from_ambiguous_exception (header));
}
static void
__gxx_dependent_exception_cleanup (_Unwind_Reason_Code code,
_Unwind_Exception *exc)
{
// This cleanup is set only for dependents.
__cxa_dependent_exception *dep = __get_dependent_exception_from_ue (exc);
__cxa_exception *header =
__get_exception_header_from_obj (dep->primaryException);
// We only want to be called through _Unwind_DeleteException.
// _Unwind_DeleteException in the HP-UX IA64 libunwind library
// returns _URC_NO_REASON and not _URC_FOREIGN_EXCEPTION_CAUGHT
// like the GCC _Unwind_DeleteException function does.
if (code != _URC_FOREIGN_EXCEPTION_CAUGHT && code != _URC_NO_REASON)
__terminate (header->terminateHandler);
if (__gnu_cxx::__exchange_and_add_dispatch (&header->referenceCount, -1) == 0)
{
if (header->exceptionDestructor)
header->exceptionDestructor (header + 1);
__cxa_free_exception (header + 1);
}
}
void
std::rethrow_exception(std::exception_ptr ep)
{
void *obj = ep._M_get();
__cxa_exception *eh = __get_exception_header_from_obj (obj);
__cxa_dependent_exception *dep = __cxa_allocate_dependent_exception ();
dep->primaryException = obj;
__gnu_cxx::__atomic_add_dispatch (&eh->referenceCount, 1);
dep->unexpectedHandler = __unexpected_handler;
dep->terminateHandler = __terminate_handler;
__GXX_INIT_DEPENDENT_EXCEPTION_CLASS(dep->unwindHeader.exception_class);
dep->unwindHeader.exception_cleanup = __gxx_dependent_exception_cleanup;
#ifdef _GLIBCXX_SJLJ_EXCEPTIONS
_Unwind_SjLj_RaiseException (&dep->unwindHeader);
#else
_Unwind_RaiseException (&dep->unwindHeader);
#endif
// Some sort of unwinding error. Note that terminate is a handler.
__cxa_begin_catch (&dep->unwindHeader);
std::terminate ();
}

21
libstdc++-v3/libsupc++/eh_throw.cc
View File

@ -1,5 +1,5 @@
// -*- C++ -*- Exception handling routines for throwing.
// Copyright (C) 2001, 2003 Free Software Foundation, Inc.
// Copyright (C) 2001, 2003, 2008 Free Software Foundation, Inc.
//
// This file is part of GCC.
//
@ -36,20 +36,23 @@ using namespace __cxxabiv1;
static void
__gxx_exception_cleanup (_Unwind_Reason_Code code, _Unwind_Exception *exc)
{
// This cleanup is set only for primaries.
__cxa_exception *header = __get_exception_header_from_ue (exc);
// If we haven't been caught by a foreign handler, then this is
// some sort of unwind error. In that case just die immediately.
// We only want to be called through _Unwind_DeleteException.
// _Unwind_DeleteException in the HP-UX IA64 libunwind library
// returns _URC_NO_REASON and not _URC_FOREIGN_EXCEPTION_CAUGHT
// returns _URC_NO_REASON and not _URC_FOREIGN_EXCEPTION_CAUGHT
// like the GCC _Unwind_DeleteException function does.
if (code != _URC_FOREIGN_EXCEPTION_CAUGHT && code != _URC_NO_REASON)
__terminate (header->terminateHandler);
if (header->exceptionDestructor)
header->exceptionDestructor (header + 1);
if (__gnu_cxx::__exchange_and_add_dispatch (&header->referenceCount, -1) == 0)
{
if (header->exceptionDestructor)
header->exceptionDestructor (header + 1);
__cxa_free_exception (header + 1);
__cxa_free_exception (header + 1);
}
}
@ -57,12 +60,14 @@ extern "C" void
__cxxabiv1::__cxa_throw (void *obj, std::type_info *tinfo,
void (*dest) (void *))
{
// Definitely a primary.
__cxa_exception *header = __get_exception_header_from_obj (obj);
header->referenceCount = 0;
header->exceptionType = tinfo;
header->exceptionDestructor = dest;
header->unexpectedHandler = __unexpected_handler;
header->terminateHandler = __terminate_handler;
__GXX_INIT_EXCEPTION_CLASS(header->unwindHeader.exception_class);
__GXX_INIT_PRIMARY_EXCEPTION_CLASS(header->unwindHeader.exception_class);
header->unwindHeader.exception_cleanup = __gxx_exception_cleanup;
#ifdef _GLIBCXX_SJLJ_EXCEPTIONS

12
libstdc++-v3/libsupc++/eh_type.cc
View File

@ -1,5 +1,5 @@
// -*- C++ -*- Exception handling routines for catching.
// Copyright (C) 2001 Free Software Foundation, Inc.
// Copyright (C) 2001, 2008 Free Software Foundation, Inc.
//
// This file is part of GCC.
//
@ -43,7 +43,15 @@ std::type_info *__cxa_current_exception_type ()
__cxa_eh_globals *globals = __cxa_get_globals ();
__cxa_exception *header = globals->caughtExceptions;
if (header)
return header->exceptionType;
{
if (__is_dependent_exception (header->unwindHeader.exception_class))
{
__cxa_dependent_exception *de =
__get_dependent_exception_from_ue (&header->unwindHeader);
header = __get_exception_header_from_obj (de->primaryException);
}
return header->exceptionType;
}
else
return 0;
}

7
libstdc++-v3/libsupc++/exception
View File

@ -1,7 +1,7 @@
// Exception Handling support header for -*- C++ -*-
// Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
// 2004, 2005, 2006, 2007
// 2004, 2005, 2006, 2007, 2008
// Free Software Foundation
//
// This file is part of GCC.
@ -110,6 +110,7 @@ namespace std
* result in a call of @c terminate() (15.5.1)."
*/
bool uncaught_exception() throw();
} // namespace std
_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
@ -132,4 +133,8 @@ _GLIBCXX_END_NAMESPACE
#pragma GCC visibility pop
#ifdef __GXX_EXPERIMENTAL_CXX0X__
#include <exception_ptr.h>
#endif
#endif

169
libstdc++-v3/libsupc++/exception_ptr.h Normal file
View File

@ -0,0 +1,169 @@
// Exception Handling support header (exception_ptr class) for -*- C++ -*-
// Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
// 2004, 2005, 2006, 2007, 2008
// Free Software Foundation
//
// 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 2, 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.
//
// You should have received a copy of the GNU General Public License
// along with GCC; see the file COPYING. If not, write to
// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
// Boston, MA 02110-1301, 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.
/** @file exception_ptr.h
* This is an internal header file, included by other headers and the
* implementation. You should not attempt to use it directly.
*/
#ifndef __EXCEPTION_PTR_H__
#define __EXCEPTION_PTR_H__
#pragma GCC visibility push(default)
#include <bits/c++config.h>
extern "C++" {
namespace std
{
// Hide the free operators from other types
namespace __exception_ptr
{
/**
* @brief An opaque pointer to an arbitrary exception.
*/
class exception_ptr;
}
using __exception_ptr::exception_ptr;
/** Obtain an %exception_ptr to the currently handled exception. If there
* is none, or the currently handled exception is foreign, return the null
* value.
*/
exception_ptr current_exception() throw();
/// Throw the object pointed to by the %exception_ptr.
void rethrow_exception(exception_ptr) __attribute__ ((__noreturn__));
/// Obtain an %exception_ptr pointing to a copy of the supplied object.
template <class _Ex>
exception_ptr copy_exception(_Ex __ex) throw();
namespace __exception_ptr
{
bool operator==(const exception_ptr&,
const exception_ptr&) throw();
bool operator!=(const exception_ptr&,
const exception_ptr&) throw();
class exception_ptr
{
void* _M_exception_object;
explicit exception_ptr(void* __e) throw();
void _M_addref() throw();
void _M_release() throw();
void *_M_get() const throw();
void _M_safe_bool_dummy();
friend exception_ptr std::current_exception() throw();
friend void std::rethrow_exception(exception_ptr);
public:
exception_ptr() throw();
typedef void (exception_ptr::*__safe_bool)();
// For construction from nullptr or 0.
exception_ptr(__safe_bool) throw();
exception_ptr(const exception_ptr&) throw();
#ifdef __GXX_EXPERIMENTAL_CXX0X__
exception_ptr(exception_ptr&& __o) throw()
: _M_exception_object(__o._M_exception_object)
{
__o._M_exception_object = 0;
}
#endif
exception_ptr& operator=(const exception_ptr&) throw();
#ifdef __GXX_EXPERIMENTAL_CXX0X__
exception_ptr& operator=(exception_ptr&& __o) throw()
{
exception_ptr(__o).swap(*this);
return *this;
}
#endif
~exception_ptr() throw();
void swap(exception_ptr&) throw();
#ifdef __GXX_EXPERIMENTAL_CXX0X__
void swap(exception_ptr &&__o) throw()
{
void *__tmp = _M_exception_object;
_M_exception_object = __o._M_exception_object;
__o._M_exception_object = __tmp;
}
#endif
bool operator!() const throw();
operator __safe_bool() const throw();
friend bool operator==(const exception_ptr&,
const exception_ptr&) throw();
const type_info *__cxa_exception_type() const throw();
};
} // namespace __exception_ptr
template <class _Ex>
exception_ptr copy_exception(_Ex __ex) throw()
{
try
{
throw __ex;
}
catch(...)
{
return current_exception ();
}
}
} // namespace std
} // extern "C++"
#pragma GCC visibility pop
#endif

143
libstdc++-v3/libsupc++/unwind-cxx.h
View File

@ -1,5 +1,5 @@
// -*- C++ -*- Exception handling and frame unwind runtime interface routines.
// Copyright (C) 2001 Free Software Foundation, Inc.
// Copyright (C) 2001, 2008 Free Software Foundation, Inc.
//
// This file is part of GCC.
//
@ -39,18 +39,22 @@
#include <exception>
#include <cstddef>
#include "unwind.h"
#include <ext/atomicity.h>
#pragma GCC visibility push(default)
namespace __cxxabiv1
{
// A C++ exception object consists of a header, which is a wrapper around
// an unwind object header with additional C++ specific information,
// 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 this header.
_Atomic_word referenceCount;
// Manage the exception object itself.
std::type_info *exceptionType;
void (*exceptionDestructor)(void *);
@ -87,6 +91,47 @@ struct __cxa_exception
_Unwind_Exception unwindHeader;
};
// 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
{
@ -105,12 +150,20 @@ struct __cxa_eh_globals
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.
// Allocate memory for the primary exception plus the thrown object.
extern "C" void *__cxa_allocate_exception(std::size_t thrown_size) throw();
// Free the space allocated for the exception.
// Free the space allocated for the primary exception.
extern "C" void __cxa_free_exception(void *thrown_exception) throw();
// Allocate memory for a dependent exception.
extern "C" __cxa_dependent_exception*
__cxa_allocate_dependent_exception() throw();
// Free the space allocated for the dependent exception.
extern "C" void
__cxa_free_dependent_exception(__cxa_dependent_exception *ex) throw();
// Throw the exception.
extern "C" void __cxa_throw (void *thrown_exception,
std::type_info *tinfo,
@ -173,6 +226,12 @@ __get_exception_header_from_ue (_Unwind_Exception *exc)
return reinterpret_cast<__cxa_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)
@ -185,11 +244,19 @@ __is_gxx_exception_class(_Unwind_Exception_Class c)
&& c[4] == 'C'
&& c[5] == '+'
&& c[6] == '+'
&& c[7] == '\0';
&& (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_EXCEPTION_CLASS(_Unwind_Exception_Class c)
__GXX_INIT_PRIMARY_EXCEPTION_CLASS(_Unwind_Exception_Class c)
{
c[0] = 'G';
c[1] = 'N';
@ -201,6 +268,19 @@ __GXX_INIT_EXCEPTION_CLASS(_Unwind_Exception_Class c)
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)
{
@ -233,8 +313,8 @@ __gxx_caught_object(_Unwind_Exception* eo)
return (void*)eo->barrier_cache.bitpattern[0];
}
#else // !__ARM_EABI_UNWINDER__
// This is the exception class we report -- "GNUCC++\0".
const _Unwind_Exception_Class __gxx_exception_class
// 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')
@ -244,13 +324,36 @@ const _Unwind_Exception_Class __gxx_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_exception_class;
return c == __gxx_primary_exception_class
|| c == __gxx_dependent_exception_class;
}
#define __GXX_INIT_EXCEPTION_CLASS(c) c = __gxx_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
@ -265,11 +368,27 @@ extern "C" _Unwind_Reason_Code __gxx_personality_sj0
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

90
libstdc++-v3/testsuite/18_support/exception_ptr/current_exception.cc Normal file
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@ -0,0 +1,90 @@
// { dg-options "-std=gnu++0x" }
// 2008-05-25 Sebastian Redl <sebastian.redl@getdesigned.at>
// Copyright (C) 2008 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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.
// This library 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 this library; see the file COPYING. If not, write to the Free
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.
// current_exception() under various conditions.
#include <exception>
#include <testsuite_hooks.h>
void test01()
{
bool test __attribute__((unused)) = true;
using namespace std;
exception_ptr ep = current_exception();
VERIFY( !ep );
}
void test02()
{
bool test __attribute__((unused)) = true;
using namespace std;
try {
throw 0;
} catch(...) {
exception_ptr ep = current_exception();
VERIFY( ep );
}
}
void test03()
{
bool test __attribute__((unused)) = true;
using namespace std;
try {
throw exception();
} catch(std::exception&) {
exception_ptr ep = current_exception();
VERIFY( ep );
}
}
void test04()
{
bool test __attribute__((unused)) = true;
using namespace std;
try {
throw 0;
} catch(...) {
exception_ptr ep1 = current_exception();
try {
throw 0;
} catch(...) {
exception_ptr ep2 = current_exception();
VERIFY( ep1 != ep2 );
}
exception_ptr ep3 = current_exception();
// Not guaranteed by standard, but by this implementation.
VERIFY( ep1 == ep3 );
}
}
int main()
{
test01();
test02();
test03();
test04();
return 0;
}

188
libstdc++-v3/testsuite/18_support/exception_ptr/lifespan.cc Normal file
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@ -0,0 +1,188 @@
// { dg-options "-std=gnu++0x" }
// 2008-05-25 Sebastian Redl <sebastian.redl@getdesigned.at>
// Copyright (C) 2008 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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.
// This library 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 this library; see the file COPYING. If not, write to the Free
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.
// Tests the life span of the exception object.
#include <exception>
#include <testsuite_hooks.h>
bool may_destruct = false;
class destructing
{
mutable bool copied;
public:
destructing() : copied(false) { }
destructing(const destructing &o) : copied(false) { o.copied = true; }
~destructing() { VERIFY( copied || may_destruct ); }
};
void test01()
{
bool test __attribute__((unused)) = true;
using namespace std;
may_destruct = false;
// Test the destructing class.
{
destructing *d = new destructing;
destructing d2(*d);
delete d;
may_destruct = true;
}
may_destruct = false;
}
void test02()
{
bool test __attribute__((unused)) = true;
using namespace std;
may_destruct = false;
try {
throw destructing();
} catch(...) {
may_destruct = true;
}
may_destruct = false;
}
void test03()
{
bool test __attribute__((unused)) = true;
using namespace std;
may_destruct = false;
try {
throw destructing();
} catch(...) {
{
exception_ptr ep = current_exception();
}
may_destruct = true;
}
may_destruct = false;
}
void test04()
{
bool test __attribute__((unused)) = true;
using namespace std;
may_destruct = false;
{
exception_ptr ep;
try {
throw destructing();
} catch(...) {
ep = current_exception();
}
may_destruct = true;
}
may_destruct = false;
}
void test05_helper()
{
using namespace std;
try {
throw destructing();
} catch(...) {
exception_ptr ep = current_exception();
rethrow_exception(ep);
}
}
void test05()
{
bool test __attribute__((unused)) = true;
using namespace std;
may_destruct = false;
try {
test05_helper();
} catch(...) {
may_destruct = true;
}
may_destruct = false;
}
void test06_helper()
{
using namespace std;
try {
throw destructing();
} catch(...) {
exception_ptr ep = current_exception();
throw;
}
}
void test06()
{
bool test __attribute__((unused)) = true;
using namespace std;
may_destruct = false;
try {
test06_helper();
} catch(...) {
may_destruct = true;
}
may_destruct = false;
}
std::exception_ptr gep;
void test99()
{
bool test __attribute__((unused)) = true;
using namespace std;
may_destruct = false;
try {
throw destructing();
} catch(...) {
gep = current_exception();
}
}
int main()
{
test01();
test02();
test03();
test04();
test05();
test06();
test99();
may_destruct = true;
return 0;
}

113
libstdc++-v3/testsuite/18_support/exception_ptr/rethrow_exception.cc Normal file
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@ -0,0 +1,113 @@
// { dg-options "-std=gnu++0x" }
// 2008-05-25 Sebastian Redl <sebastian.redl@getdesigned.at>
// Copyright (C) 2008 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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.
// This library 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 this library; see the file COPYING. If not, write to the Free
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.
// rethrow_exception() and preservation of data
#include <exception>
#include <typeinfo>
#include <cstring>
#include <stdexcept>
#include <testsuite_hooks.h>
void test01()
{
bool test __attribute__((unused)) = true;
using namespace std;
try {
rethrow_exception(copy_exception(0));
} catch(...) {
}
}
void test02()
{
bool test __attribute__((unused)) = true;
using namespace std;
try {
rethrow_exception(copy_exception(runtime_error("test")));
} catch(exception &e) {
VERIFY( typeid(e) == typeid(runtime_error) );
VERIFY( strcmp(e.what(), "test") == 0 );
}
}
void test03()
{
bool test __attribute__((unused)) = true;
using namespace std;
exception_ptr ep;
try {
throw 0;
} catch(...) {
ep = current_exception();
}
try {
rethrow_exception(ep);
} catch(...) {
}
}
void test04()
{
bool test __attribute__((unused)) = true;
using namespace std;
// Weave the exceptions in an attempt to confuse the machinery.
try {
throw 0;
} catch(...) {
exception_ptr ep1 = current_exception();
try {
throw 1;
} catch(...) {
exception_ptr ep2 = current_exception();
try {
rethrow_exception(ep1);
} catch(...) {
try {
rethrow_exception(ep2);
} catch(...) {
try {
rethrow_exception(ep1);
} catch(...) {
}
try {
rethrow_exception(ep2);
} catch(...) {
}
}
}
}
}
}
int main()
{
test01();
test02();
test03();
test04();
return 0;
}