Reorganize the gcc vendor import work area. This flattens out a bunch

of unnecessary path components that are relics of cvs2svn.

(These are directory moves)

1 files changed, 201 insertions, 0 deletions

diff --git a/libstdc++/libsupc++/guard.cc b/libstdc++/libsupc++/guard.cc
new file mode 100644
index 0000000..eb64216
--- /dev/null
+++ b/libstdc++/libsupc++/guard.cc
@@ -0,0 +1,201 @@
+// Copyright (C) 2002, 2004, 2006 Free Software Foundation, Inc.
+//  
+// This file is part of GCC.
+//
+// GCC is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// GCC is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with GCC; see the file COPYING.  If not, write to
+// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+// Boston, MA 02110-1301, USA. 
+
+// As a special exception, you may use this file as part of a free software
+// library without restriction.  Specifically, if other files instantiate
+// templates or use macros or inline functions from this file, or you compile
+// this file and link it with other files to produce an executable, this
+// file does not by itself cause the resulting executable to be covered by
+// the GNU General Public License.  This exception does not however
+// invalidate any other reasons why the executable file might be covered by
+// the GNU General Public License.
+
+// Written by Mark Mitchell, CodeSourcery LLC, <mark@codesourcery.com>
+// Thread support written by Jason Merrill, Red Hat Inc. <jason@redhat.com>
+
+#include <bits/c++config.h>
+#include <cxxabi.h>
+#include <exception>
+#include <new>
+#include <ext/atomicity.h>
+#include <ext/concurrence.h>
+
+// The IA64/generic ABI uses the first byte of the guard variable.
+// The ARM EABI uses the least significant bit.
+
+// Thread-safe static local initialization support.
+#ifdef __GTHREADS
+namespace
+{
+  // A single mutex controlling all static initializations.
+  static __gnu_cxx::__recursive_mutex* static_mutex;  
+
+  typedef char fake_recursive_mutex[sizeof(__gnu_cxx::__recursive_mutex)]
+  __attribute__ ((aligned(__alignof__(__gnu_cxx::__recursive_mutex))));
+  fake_recursive_mutex fake_mutex;
+
+  static void init()
+  { static_mutex =  new (&fake_mutex) __gnu_cxx::__recursive_mutex(); }
+
+  __gnu_cxx::__recursive_mutex&
+  get_static_mutex()
+  {
+    static __gthread_once_t once = __GTHREAD_ONCE_INIT;
+    __gthread_once(&once, init);
+    return *static_mutex;
+  }
+}
+
+#ifndef _GLIBCXX_GUARD_TEST_AND_ACQUIRE
+inline bool
+__test_and_acquire (__cxxabiv1::__guard *g)
+{
+  bool b = _GLIBCXX_GUARD_TEST (g);
+  _GLIBCXX_READ_MEM_BARRIER;
+  return b;
+}
+#define _GLIBCXX_GUARD_TEST_AND_ACQUIRE(G) __test_and_acquire (G)
+#endif
+
+#ifndef _GLIBCXX_GUARD_SET_AND_RELEASE
+inline void
+__set_and_release (__cxxabiv1::__guard *g)
+{
+  _GLIBCXX_WRITE_MEM_BARRIER;
+  _GLIBCXX_GUARD_SET (g);
+}
+#define _GLIBCXX_GUARD_SET_AND_RELEASE(G) __set_and_release (G)
+#endif
+
+#else /* !__GTHREADS */
+
+#undef _GLIBCXX_GUARD_TEST_AND_ACQUIRE
+#undef _GLIBCXX_GUARD_SET_AND_RELEASE
+#define _GLIBCXX_GUARD_SET_AND_RELEASE(G) _GLIBCXX_GUARD_SET (G)
+
+#endif /* __GTHREADS */
+
+namespace __gnu_cxx
+{
+  // 6.7[stmt.dcl]/4: If control re-enters the declaration (recursively)
+  // while the object is being initialized, the behavior is undefined.
+
+  // Since we already have a library function to handle locking, we might
+  // as well check for this situation and throw an exception.
+  // We use the second byte of the guard variable to remember that we're
+  // in the middle of an initialization.
+  class recursive_init_error: public std::exception
+  {
+  public:
+    recursive_init_error() throw() { }
+    virtual ~recursive_init_error() throw ();
+  };
+
+  recursive_init_error::~recursive_init_error() throw() { }
+}
+
+namespace __cxxabiv1 
+{
+  static inline int
+  recursion_push (__guard* g)
+  { return ((char *)g)[1]++; }
+
+  static inline void
+  recursion_pop (__guard* g)
+  { --((char *)g)[1]; }
+
+  static int
+  acquire (__guard *g)
+  {
+    if (_GLIBCXX_GUARD_TEST (g))
+      return 0;
+
+    if (recursion_push (g))
+      {
+#ifdef __EXCEPTIONS
+	throw __gnu_cxx::recursive_init_error();
+#else
+	// Use __builtin_trap so we don't require abort().
+	__builtin_trap ();
+#endif
+      }
+    return 1;
+  }
+
+  extern "C"
+  int __cxa_guard_acquire (__guard *g) 
+  {
+#ifdef __GTHREADS
+    // If the target can reorder loads, we need to insert a read memory
+    // barrier so that accesses to the guarded variable happen after the
+    // guard test.
+    if (_GLIBCXX_GUARD_TEST_AND_ACQUIRE (g))
+      return 0;
+
+    if (__gthread_active_p ())
+      {
+	// Simple wrapper for exception safety.
+	struct mutex_wrapper
+	{
+	  bool unlock;
+	  mutex_wrapper() : unlock(true)
+	  { get_static_mutex().lock(); }
+
+	  ~mutex_wrapper()
+	  {
+	    if (unlock)
+	      static_mutex->unlock();
+	  }
+	};
+
+	mutex_wrapper mw;
+	if (acquire (g))
+	  {
+	    mw.unlock = false;
+	    return 1;
+	  }
+
+	return 0;
+      }
+#endif
+
+    return acquire (g);
+  }
+
+  extern "C"
+  void __cxa_guard_abort (__guard *g)
+  {
+    recursion_pop (g);
+#ifdef __GTHREADS
+    if (__gthread_active_p ())
+      static_mutex->unlock();
+#endif
+  }
+
+  extern "C"
+  void __cxa_guard_release (__guard *g)
+  {
+    recursion_pop (g);
+    _GLIBCXX_GUARD_SET_AND_RELEASE (g);
+#ifdef __GTHREADS
+    if (__gthread_active_p ())
+      static_mutex->unlock();
+#endif
+  }
+}