gcc/libstdc++-v3/libsupc++/eh_globals.cc

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// -*- C++ -*- Manage the thread-local exception globals.
// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006
// 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 <cstdlib>
#include "cxxabi.h"
#include "unwind-cxx.h"
#include "bits/gthr.h"
#if _GLIBCXX_HOSTED
using std::free;
using std::malloc;
#else
// In a freestanding environment, these functions may not be
// available -- but for now, we assume that they are.
extern "C" void *malloc (std::size_t);
extern "C" void free(void *);
#endif
using namespace __cxxabiv1;
#if _GLIBCXX_HAVE_TLS
namespace
{
abi::__cxa_eh_globals*
get_global() throw()
{
static __thread abi::__cxa_eh_globals global;
return &global;
}
} // anonymous namespace
extern "C" __cxa_eh_globals*
__cxxabiv1::__cxa_get_globals_fast() throw()
{ return get_global(); }
extern "C" __cxa_eh_globals*
__cxxabiv1::__cxa_get_globals() throw()
{ return get_global(); }
#else
// Single-threaded fallback buffer.
static __cxa_eh_globals eh_globals;
#if __GTHREADS
static void
eh_globals_dtor(void* ptr)
{
if (ptr)
{
__cxa_eh_globals* g = reinterpret_cast<__cxa_eh_globals*>(ptr);
__cxa_exception* exn = g->caughtExceptions;
__cxa_exception* next;
while (exn)
{
next = exn->nextException;
_Unwind_DeleteException(&exn->unwindHeader);
exn = next;
}
free(ptr);
}
}
struct __eh_globals_init
{
__gthread_key_t _M_key;
bool _M_init;
__eh_globals_init() : _M_init(false)
{
if (__gthread_active_p())
_M_init = __gthread_key_create(&_M_key, eh_globals_dtor) == 0;
}
~__eh_globals_init()
{
if (_M_init)
__gthread_key_delete(_M_key);
_M_init = false;
}
};
static __eh_globals_init init;
extern "C" __cxa_eh_globals*
__cxxabiv1::__cxa_get_globals_fast() throw()
{
__cxa_eh_globals* g;
if (init._M_init)
g = static_cast<__cxa_eh_globals*>(__gthread_getspecific(init._M_key));
else
g = &eh_globals;
return g;
}
extern "C" __cxa_eh_globals*
__cxxabiv1::__cxa_get_globals() throw()
{
__cxa_eh_globals* g;
if (init._M_init)
{
g = static_cast<__cxa_eh_globals*>(__gthread_getspecific(init._M_key));
if (!g)
{
void* v = malloc(sizeof(__cxa_eh_globals));
if (v == 0 || __gthread_setspecific(init._M_key, v) != 0)
std::terminate();
g = static_cast<__cxa_eh_globals*>(v);
g->caughtExceptions = 0;
g->uncaughtExceptions = 0;
#ifdef __ARM_EABI_UNWINDER__
g->propagatingExceptions = 0;
#endif
}
}
else
g = &eh_globals;
return g;
}
#else
extern "C" __cxa_eh_globals*
__cxxabiv1::__cxa_get_globals_fast() throw()
{ return &eh_globals; }
extern "C" __cxa_eh_globals*
__cxxabiv1::__cxa_get_globals() throw()
{ return &eh_globals; }
#endif
#endif