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// -*- C++ -*- Manage the thread-local exception globals. |
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// Copyright (C) 2001-2013 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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// . |
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#include |
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#include |
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#include |
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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 |