1 // -*- C++ -*- Manage the thread-local exception globals.
2 // Copyright (C) 2001-2014 Free Software Foundation, Inc.
4 // This file is part of GCC.
6 // GCC is free software; you can redistribute it and/or modify
7 // it under the terms of the GNU General Public License as published by
8 // the Free Software Foundation; either version 3, or (at your option)
11 // GCC is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
25 #include <bits/c++config.h>
29 #include "unwind-cxx.h"
30 #include "bits/gthr.h"
36 // In a freestanding environment, these functions may not be
37 // available -- but for now, we assume that they are.
38 extern "C" void *malloc (std::size_t);
39 extern "C" void free(void *);
42 using namespace __cxxabiv1;
48 abi::__cxa_eh_globals*
49 get_global() _GLIBCXX_NOTHROW
51 static __thread abi::__cxa_eh_globals global;
54 } // anonymous namespace
56 extern "C" __cxa_eh_globals*
57 __cxxabiv1::__cxa_get_globals_fast() _GLIBCXX_NOTHROW
58 { return get_global(); }
60 extern "C" __cxa_eh_globals*
61 __cxxabiv1::__cxa_get_globals() _GLIBCXX_NOTHROW
62 { return get_global(); }
67 // Single-threaded fallback buffer.
68 static __cxa_eh_globals eh_globals;
73 eh_globals_dtor(void* ptr)
77 __cxa_eh_globals* g = reinterpret_cast<__cxa_eh_globals*>(ptr);
78 __cxa_exception* exn = g->caughtExceptions;
79 __cxa_exception* next;
82 next = exn->nextException;
83 _Unwind_DeleteException(&exn->unwindHeader);
90 struct __eh_globals_init
92 __gthread_key_t _M_key;
95 __eh_globals_init() : _M_init(false)
97 if (__gthread_active_p())
98 _M_init = __gthread_key_create(&_M_key, eh_globals_dtor) == 0;
104 __gthread_key_delete(_M_key);
109 static __eh_globals_init init;
111 extern "C" __cxa_eh_globals*
112 __cxxabiv1::__cxa_get_globals_fast() _GLIBCXX_NOTHROW
116 g = static_cast<__cxa_eh_globals*>(__gthread_getspecific(init._M_key));
122 extern "C" __cxa_eh_globals*
123 __cxxabiv1::__cxa_get_globals() _GLIBCXX_NOTHROW
128 g = static_cast<__cxa_eh_globals*>(__gthread_getspecific(init._M_key));
131 void* v = malloc(sizeof(__cxa_eh_globals));
132 if (v == 0 || __gthread_setspecific(init._M_key, v) != 0)
134 g = static_cast<__cxa_eh_globals*>(v);
135 g->caughtExceptions = 0;
136 g->uncaughtExceptions = 0;
137 #ifdef __ARM_EABI_UNWINDER__
138 g->propagatingExceptions = 0;
149 extern "C" __cxa_eh_globals*
150 __cxxabiv1::__cxa_get_globals_fast() _GLIBCXX_NOTHROW
151 { return &eh_globals; }
153 extern "C" __cxa_eh_globals*
154 __cxxabiv1::__cxa_get_globals() _GLIBCXX_NOTHROW
155 { return &eh_globals; }