160 lines
3.7 KiB
C++
160 lines
3.7 KiB
C++
// -*- C++ -*- Manage the thread-local exception globals.
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// Copyright (C) 2001-2021 Free Software Foundation, Inc.
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//
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// This file is part of GCC.
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//
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// GCC is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3, or (at your option)
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// any later version.
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//
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// GCC is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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#include <bits/c++config.h>
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#include <exception>
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#include <cstdlib>
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#include "cxxabi.h"
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#include "unwind-cxx.h"
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#include "bits/gthr.h"
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#if _GLIBCXX_HOSTED
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using std::free;
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using std::malloc;
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#else
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// In a freestanding environment, these functions may not be
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// available -- but for now, we assume that they are.
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extern "C" void *malloc (std::size_t);
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extern "C" void free(void *);
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#endif
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using namespace __cxxabiv1;
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#if _GLIBCXX_HAVE_TLS
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namespace
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{
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abi::__cxa_eh_globals*
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get_global() _GLIBCXX_NOTHROW
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{
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static __thread abi::__cxa_eh_globals global;
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return &global;
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}
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} // anonymous namespace
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extern "C" __cxa_eh_globals*
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__cxxabiv1::__cxa_get_globals_fast() _GLIBCXX_NOTHROW
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{ return get_global(); }
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extern "C" __cxa_eh_globals*
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__cxxabiv1::__cxa_get_globals() _GLIBCXX_NOTHROW
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{ return get_global(); }
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#else
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// Single-threaded fallback buffer.
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static __cxa_eh_globals eh_globals;
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#if __GTHREADS
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static void
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eh_globals_dtor(void* ptr)
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{
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if (ptr)
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{
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__cxa_eh_globals* g = reinterpret_cast<__cxa_eh_globals*>(ptr);
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__cxa_exception* exn = g->caughtExceptions;
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__cxa_exception* next;
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while (exn)
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{
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next = exn->nextException;
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_Unwind_DeleteException(&exn->unwindHeader);
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exn = next;
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}
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free(ptr);
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}
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}
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struct __eh_globals_init
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{
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__gthread_key_t _M_key;
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bool _M_init;
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__eh_globals_init() : _M_init(false)
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{
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if (__gthread_active_p())
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_M_init = __gthread_key_create(&_M_key, eh_globals_dtor) == 0;
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}
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~__eh_globals_init()
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{
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if (_M_init)
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__gthread_key_delete(_M_key);
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_M_init = false;
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}
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};
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static __eh_globals_init init;
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extern "C" __cxa_eh_globals*
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__cxxabiv1::__cxa_get_globals_fast() _GLIBCXX_NOTHROW
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{
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__cxa_eh_globals* g;
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if (init._M_init)
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g = static_cast<__cxa_eh_globals*>(__gthread_getspecific(init._M_key));
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else
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g = &eh_globals;
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return g;
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}
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extern "C" __cxa_eh_globals*
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__cxxabiv1::__cxa_get_globals() _GLIBCXX_NOTHROW
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{
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__cxa_eh_globals* g;
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if (init._M_init)
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{
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g = static_cast<__cxa_eh_globals*>(__gthread_getspecific(init._M_key));
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if (!g)
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{
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void* v = malloc(sizeof(__cxa_eh_globals));
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if (v == 0 || __gthread_setspecific(init._M_key, v) != 0)
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std::terminate();
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g = static_cast<__cxa_eh_globals*>(v);
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g->caughtExceptions = 0;
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g->uncaughtExceptions = 0;
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#ifdef __ARM_EABI_UNWINDER__
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g->propagatingExceptions = 0;
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#endif
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}
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}
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else
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g = &eh_globals;
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return g;
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}
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#else
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extern "C" __cxa_eh_globals*
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__cxxabiv1::__cxa_get_globals_fast() _GLIBCXX_NOTHROW
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{ return &eh_globals; }
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extern "C" __cxa_eh_globals*
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__cxxabiv1::__cxa_get_globals() _GLIBCXX_NOTHROW
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{ return &eh_globals; }
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#endif
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#endif
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