160 lines
3.7 KiB
C++
160 lines
3.7 KiB
C++
// -*- C++ -*- Manage the thread-local exception globals.
|
|
// Copyright (C) 2001-2022 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/>.
|
|
|
|
#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() _GLIBCXX_NOTHROW
|
|
{
|
|
static __thread abi::__cxa_eh_globals global;
|
|
return &global;
|
|
}
|
|
} // anonymous namespace
|
|
|
|
extern "C" __cxa_eh_globals*
|
|
__cxxabiv1::__cxa_get_globals_fast() _GLIBCXX_NOTHROW
|
|
{ return get_global(); }
|
|
|
|
extern "C" __cxa_eh_globals*
|
|
__cxxabiv1::__cxa_get_globals() _GLIBCXX_NOTHROW
|
|
{ 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() _GLIBCXX_NOTHROW
|
|
{
|
|
__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() _GLIBCXX_NOTHROW
|
|
{
|
|
__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() _GLIBCXX_NOTHROW
|
|
{ return &eh_globals; }
|
|
|
|
extern "C" __cxa_eh_globals*
|
|
__cxxabiv1::__cxa_get_globals() _GLIBCXX_NOTHROW
|
|
{ return &eh_globals; }
|
|
|
|
#endif
|
|
|
|
#endif
|