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2005-11-21 Benjamin Kosnik <bkoz@redhat.com> * libsupc++/del_op.cc: Include c++config.h first. * libsupc++/eh_alloc.cc: Same. * libsupc++/new_opv.cc: Same. * libsupc++/eh_throw.cc: Same. * libsupc++/new_op.cc: Same. * libsupc++/del_opv.cc: Same. * libsupc++/eh_catch.cc: Same. * libsupc++/guard.cc: Same. * libsupc++/del_opnt.cc: Same. * libsupc++/eh_exception.cc: Same. * libsupc++/new_opvnt.cc: Same. * libsupc++/eh_term_handler.cc: Same. * libsupc++/eh_personality.cc: Same. * libsupc++/eh_call.cc: Same. * libsupc++/new_opnt.cc: Same. * libsupc++/del_opvnt.cc: Same. 2005-11-21 Benjamin Kosnik <bkoz@redhat.com> * src/Makefile.am (LTCXXCOMPILE): CXXFLAGS last. * libsupc++/Makefile.am: Same. * src/Makefile.in: Regenerate. * libsupc++/Makefile.in: Same. From-SVN: r107343
231 lines
5.6 KiB
C++
231 lines
5.6 KiB
C++
// Copyright (C) 2002 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 2, or (at your option)
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// any later version.
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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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// You should have received a copy of the GNU General Public License
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// along with GCC; see the file COPYING. If not, write to
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// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
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// Boston, MA 02110-1301, USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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// Written by Mark Mitchell, CodeSourcery LLC, <mark@codesourcery.com>
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// Thread support written by Jason Merrill, Red Hat Inc. <jason@redhat.com>
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#include <bits/c++config.h>
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#include <cxxabi.h>
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#include <exception>
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#include <bits/gthr.h>
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#include <bits/atomicity.h>
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// The IA64/generic ABI uses the first byte of the guard variable.
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// The ARM EABI uses the least significant bit.
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// Thread-safe static local initialization support.
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#ifdef __GTHREADS
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namespace
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{
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// static_mutex is a single mutex controlling all static initializations.
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// This is a static class--the need for a static initialization function
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// to pass to __gthread_once precludes creating multiple instances, though
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// I suppose you could achieve the same effect with a template.
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class static_mutex
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{
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static __gthread_recursive_mutex_t mutex;
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#ifdef __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION
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static void init();
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#endif
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public:
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static void lock();
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static void unlock();
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};
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__gthread_recursive_mutex_t static_mutex::mutex
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#ifdef __GTHREAD_RECURSIVE_MUTEX_INIT
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= __GTHREAD_RECURSIVE_MUTEX_INIT
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#endif
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;
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#ifdef __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION
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void static_mutex::init()
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{
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__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION (&mutex);
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}
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#endif
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void static_mutex::lock()
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{
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#ifdef __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION
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static __gthread_once_t once = __GTHREAD_ONCE_INIT;
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__gthread_once (&once, init);
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#endif
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__gthread_recursive_mutex_lock (&mutex);
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}
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void static_mutex::unlock ()
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{
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__gthread_recursive_mutex_unlock (&mutex);
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}
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}
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#ifndef _GLIBCXX_GUARD_TEST_AND_ACQUIRE
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inline bool
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__test_and_acquire (__cxxabiv1::__guard *g)
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{
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bool b = _GLIBCXX_GUARD_TEST (g);
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_GLIBCXX_READ_MEM_BARRIER;
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return b;
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}
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#define _GLIBCXX_GUARD_TEST_AND_ACQUIRE(G) __test_and_acquire (G)
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#endif
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#ifndef _GLIBCXX_GUARD_SET_AND_RELEASE
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inline void
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__set_and_release (__cxxabiv1::__guard *g)
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{
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_GLIBCXX_WRITE_MEM_BARRIER;
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_GLIBCXX_GUARD_SET (g);
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}
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#define _GLIBCXX_GUARD_SET_AND_RELEASE(G) __set_and_release (G)
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#endif
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#else /* !__GTHREADS */
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#undef _GLIBCXX_GUARD_TEST_AND_ACQUIRE
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#undef _GLIBCXX_GUARD_SET_AND_RELEASE
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#define _GLIBCXX_GUARD_SET_AND_RELEASE(G) _GLIBCXX_GUARD_SET (G)
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#endif /* __GTHREADS */
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namespace __gnu_cxx
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{
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// 6.7[stmt.dcl]/4: If control re-enters the declaration (recursively)
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// while the object is being initialized, the behavior is undefined.
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// Since we already have a library function to handle locking, we might
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// as well check for this situation and throw an exception.
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// We use the second byte of the guard variable to remember that we're
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// in the middle of an initialization.
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class recursive_init: public std::exception
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{
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public:
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recursive_init() throw() { }
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virtual ~recursive_init() throw ();
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};
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recursive_init::~recursive_init() throw() { }
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}
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namespace __cxxabiv1
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{
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static inline int
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recursion_push (__guard* g)
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{
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return ((char *)g)[1]++;
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}
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static inline void
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recursion_pop (__guard* g)
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{
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--((char *)g)[1];
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}
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static int
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acquire_1 (__guard *g)
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{
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if (_GLIBCXX_GUARD_TEST (g))
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return 0;
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if (recursion_push (g))
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{
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#ifdef __EXCEPTIONS
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throw __gnu_cxx::recursive_init();
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#else
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// Use __builtin_trap so we don't require abort().
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__builtin_trap ();
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#endif
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}
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return 1;
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}
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extern "C"
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int __cxa_guard_acquire (__guard *g)
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{
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#ifdef __GTHREADS
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// If the target can reorder loads, we need to insert a read memory
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// barrier so that accesses to the guarded variable happen after the
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// guard test.
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if (_GLIBCXX_GUARD_TEST_AND_ACQUIRE (g))
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return 0;
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if (__gthread_active_p ())
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{
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// Simple wrapper for exception safety.
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struct mutex_wrapper
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{
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bool unlock;
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mutex_wrapper (): unlock(true)
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{
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static_mutex::lock ();
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}
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~mutex_wrapper ()
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{
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if (unlock)
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static_mutex::unlock ();
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}
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} mw;
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if (acquire_1 (g))
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{
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mw.unlock = false;
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return 1;
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}
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return 0;
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}
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#endif
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return acquire_1 (g);
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}
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extern "C"
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void __cxa_guard_abort (__guard *g)
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{
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recursion_pop (g);
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#ifdef __GTHREADS
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if (__gthread_active_p ())
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static_mutex::unlock ();
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#endif
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}
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extern "C"
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void __cxa_guard_release (__guard *g)
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{
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recursion_pop (g);
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_GLIBCXX_GUARD_SET_AND_RELEASE (g);
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#ifdef __GTHREADS
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if (__gthread_active_p ())
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static_mutex::unlock ();
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#endif
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}
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}
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