1 // -*- C++ -*- Manage the thread-local exception globals.
2 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006
3 // Free Software Foundation, Inc.
5 // This file is part of GCC.
7 // GCC is free software; you can redistribute it and/or modify
8 // it under the terms of the GNU General Public License as published by
9 // the Free Software Foundation; either version 2, or (at your option)
12 // GCC is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with GCC; see the file COPYING. If not, write to
19 // the Free Software Foundation, 51 Franklin Street, Fifth Floor,
20 // Boston, MA 02110-1301, USA.
22 // As a special exception, you may use this file as part of a free software
23 // library without restriction. Specifically, if other files instantiate
24 // templates or use macros or inline functions from this file, or you compile
25 // this file and link it with other files to produce an executable, this
26 // file does not by itself cause the resulting executable to be covered by
27 // the GNU General Public License. This exception does not however
28 // invalidate any other reasons why the executable file might be covered by
29 // the GNU General Public License.
31 #include <bits/c++config.h>
35 #include "unwind-cxx.h"
36 #include "bits/gthr.h"
42 // In a freestanding environment, these functions may not be
43 // available -- but for now, we assume that they are.
44 extern "C" void *malloc (std::size_t);
45 extern "C" void free(void *);
48 using namespace __cxxabiv1;
54 abi::__cxa_eh_globals*
57 static __thread abi::__cxa_eh_globals global;
60 } // anonymous namespace
62 extern "C" __cxa_eh_globals*
63 __cxxabiv1::__cxa_get_globals_fast() throw()
64 { return get_global(); }
66 extern "C" __cxa_eh_globals*
67 __cxxabiv1::__cxa_get_globals() throw()
68 { return get_global(); }
73 // Single-threaded fallback buffer.
74 static __cxa_eh_globals eh_globals;
79 eh_globals_dtor(void* ptr)
83 __cxa_eh_globals* g = reinterpret_cast<__cxa_eh_globals*>(ptr);
84 __cxa_exception* exn = g->caughtExceptions;
85 __cxa_exception* next;
88 next = exn->nextException;
89 _Unwind_DeleteException(&exn->unwindHeader);
96 struct __eh_globals_init
98 __gthread_key_t _M_key;
101 __eh_globals_init() : _M_init(false)
103 if (__gthread_active_p())
104 _M_init = __gthread_key_create(&_M_key, eh_globals_dtor) == 0;
110 __gthread_key_delete(_M_key);
115 static __eh_globals_init init;
117 extern "C" __cxa_eh_globals*
118 __cxxabiv1::__cxa_get_globals_fast() throw()
122 g = static_cast<__cxa_eh_globals*>(__gthread_getspecific(init._M_key));
128 extern "C" __cxa_eh_globals*
129 __cxxabiv1::__cxa_get_globals() throw()
134 g = static_cast<__cxa_eh_globals*>(__gthread_getspecific(init._M_key));
137 void* v = malloc(sizeof(__cxa_eh_globals));
138 if (v == 0 || __gthread_setspecific(init._M_key, v) != 0)
140 g = static_cast<__cxa_eh_globals*>(v);
141 g->caughtExceptions = 0;
142 g->uncaughtExceptions = 0;
152 extern "C" __cxa_eh_globals*
153 __cxxabiv1::__cxa_get_globals_fast() throw()
154 { return &eh_globals; }
156 extern "C" __cxa_eh_globals*
157 __cxxabiv1::__cxa_get_globals() throw()
158 { return &eh_globals; }