From 82bcbebce43f0227f506d75a5b764b6847041bae Mon Sep 17 00:00:00 2001
From: Ben Cheng <bccheng@google.com>
Date: Mon, 1 Oct 2012 10:30:31 -0700
Subject: Initial check-in of gcc 4.7.2.

Change-Id: I4a2f5a921c21741a0e18bda986d77e5f1bef0365
---
 gcc-4.7/libstdc++-v3/libsupc++/eh_globals.cc | 160 +++++++++++++++++++++++++++
 1 file changed, 160 insertions(+)
 create mode 100644 gcc-4.7/libstdc++-v3/libsupc++/eh_globals.cc

(limited to 'gcc-4.7/libstdc++-v3/libsupc++/eh_globals.cc')

diff --git a/gcc-4.7/libstdc++-v3/libsupc++/eh_globals.cc b/gcc-4.7/libstdc++-v3/libsupc++/eh_globals.cc
new file mode 100644
index 000000000..0c7f6b760
--- /dev/null
+++ b/gcc-4.7/libstdc++-v3/libsupc++/eh_globals.cc
@@ -0,0 +1,160 @@
+// -*- C++ -*- Manage the thread-local exception globals.
+// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2009, 2011
+// 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 3, 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.
+//
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+#include <bits/c++config.h>
+#include <exception>
+#include <cstdlib>
+#include "cxxabi.h"
+#include "unwind-cxx.h"
+#include "bits/gthr.h"
+
+#if _GLIBCXX_HOSTED
+using std::free;
+using std::malloc;
+#else
+// In a freestanding environment, these functions may not be
+// available -- but for now, we assume that they are.
+extern "C" void *malloc (std::size_t);
+extern "C" void free(void *);
+#endif
+
+using namespace __cxxabiv1;
+
+#if _GLIBCXX_HAVE_TLS
+
+namespace
+{
+  abi::__cxa_eh_globals*
+  get_global() _GLIBCXX_NOTHROW
+  {
+    static __thread abi::__cxa_eh_globals global;
+    return &global;
+  }
+} // anonymous namespace
+
+extern "C" __cxa_eh_globals*
+__cxxabiv1::__cxa_get_globals_fast() _GLIBCXX_NOTHROW
+{ return get_global(); }
+
+extern "C" __cxa_eh_globals*
+__cxxabiv1::__cxa_get_globals() _GLIBCXX_NOTHROW
+{ return get_global(); }
+
+
+#else
+
+// Single-threaded fallback buffer.
+static __cxa_eh_globals eh_globals;
+
+#if __GTHREADS
+
+static void
+eh_globals_dtor(void* ptr)
+{
+  if (ptr)
+    {
+      __cxa_eh_globals* g = reinterpret_cast<__cxa_eh_globals*>(ptr);
+      __cxa_exception* exn = g->caughtExceptions;
+      __cxa_exception* next;
+      while (exn)
+	{
+	  next = exn->nextException;
+	  _Unwind_DeleteException(&exn->unwindHeader);
+	  exn = next;
+	}
+      free(ptr);
+    }
+}
+
+struct __eh_globals_init
+{
+  __gthread_key_t  	_M_key;
+  bool 			_M_init;
+
+  __eh_globals_init() : _M_init(false)
+  { 
+    if (__gthread_active_p())
+      _M_init = __gthread_key_create(&_M_key, eh_globals_dtor) == 0; 
+  }
+
+  ~__eh_globals_init()
+  {
+    if (_M_init)
+      __gthread_key_delete(_M_key);
+    _M_init = false;
+  }
+};
+
+static __eh_globals_init init;
+
+extern "C" __cxa_eh_globals*
+__cxxabiv1::__cxa_get_globals_fast() _GLIBCXX_NOTHROW
+{
+  __cxa_eh_globals* g;
+  if (init._M_init)
+    g = static_cast<__cxa_eh_globals*>(__gthread_getspecific(init._M_key));
+  else
+    g = &eh_globals;
+  return g;
+}
+
+extern "C" __cxa_eh_globals*
+__cxxabiv1::__cxa_get_globals() _GLIBCXX_NOTHROW
+{
+  __cxa_eh_globals* g;
+  if (init._M_init)
+    {
+      g = static_cast<__cxa_eh_globals*>(__gthread_getspecific(init._M_key));
+      if (!g)
+	{
+	  void* v = malloc(sizeof(__cxa_eh_globals));
+	  if (v == 0 || __gthread_setspecific(init._M_key, v) != 0)
+	    std::terminate();
+	  g = static_cast<__cxa_eh_globals*>(v);
+	  g->caughtExceptions = 0;
+	  g->uncaughtExceptions = 0;
+#ifdef __ARM_EABI_UNWINDER__
+	  g->propagatingExceptions = 0;
+#endif
+	}
+    }
+  else
+    g = &eh_globals;
+  return g;
+}
+
+#else
+
+extern "C" __cxa_eh_globals*
+__cxxabiv1::__cxa_get_globals_fast() _GLIBCXX_NOTHROW
+{ return &eh_globals; }
+
+extern "C" __cxa_eh_globals*
+__cxxabiv1::__cxa_get_globals() _GLIBCXX_NOTHROW
+{ return &eh_globals; }
+
+#endif
+
+#endif
-- 
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