1 files changed, 138 insertions, 0 deletions
diff --git a/libstdc++-v3/libsupc++/eh_catch.cc b/libstdc++-v3/libsupc++/eh_catch.cc
new file mode 100644
index 000000000..567222aa5
--- /dev/null
+++ b/libstdc++-v3/libsupc++/eh_catch.cc
@@ -0,0 +1,138 @@
+// -*- C++ -*- Exception handling routines for catching.
+// Copyright (C) 2001, 2003, 2004, 2009 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 <cstdlib>
+#include "unwind-cxx.h"
+
+using namespace __cxxabiv1;
+
+extern "C" void *
+__cxxabiv1::__cxa_get_exception_ptr(void *exc_obj_in) throw()
+{
+  _Unwind_Exception *exceptionObject
+    = reinterpret_cast <_Unwind_Exception *>(exc_obj_in);
+
+  return __gxx_caught_object(exceptionObject);
+}
+
+extern "C" void *
+__cxxabiv1::__cxa_begin_catch (void *exc_obj_in) throw()
+{
+  _Unwind_Exception *exceptionObject
+    = reinterpret_cast <_Unwind_Exception *>(exc_obj_in);
+  __cxa_eh_globals *globals = __cxa_get_globals ();
+  __cxa_exception *prev = globals->caughtExceptions;
+  __cxa_exception *header = __get_exception_header_from_ue (exceptionObject);
+  void* objectp;
+
+  // Foreign exceptions can't be stacked here.  If the exception stack is
+  // empty, then fine.  Otherwise we really have no choice but to terminate.
+  // Note that this use of "header" is a lie.  It's fine so long as we only
+  // examine header->unwindHeader though.
+  if (!__is_gxx_exception_class(header->unwindHeader.exception_class))
+    {
+      if (prev != 0)
+	std::terminate ();
+
+      // Remember for end_catch and rethrow.
+      globals->caughtExceptions = header;
+
+      // ??? No sensible value to return; we don't know what the 
+      // object is, much less where it is in relation to the header.
+      return 0;
+    }
+
+  int count = header->handlerCount;
+  // Count is less than zero if this exception was rethrown from an
+  // immediately enclosing region.
+  if (count < 0)
+    count = -count + 1;
+  else
+    count += 1;
+  header->handlerCount = count;
+  globals->uncaughtExceptions -= 1;
+
+  if (header != prev)
+    {
+      header->nextException = prev;
+      globals->caughtExceptions = header;
+    }
+
+  objectp = __gxx_caught_object(exceptionObject);
+#ifdef __ARM_EABI_UNWINDER__
+  _Unwind_Complete(exceptionObject);
+#endif
+  return objectp;
+}
+
+
+extern "C" void
+__cxxabiv1::__cxa_end_catch ()
+{
+  __cxa_eh_globals *globals = __cxa_get_globals_fast ();
+  __cxa_exception *header = globals->caughtExceptions;
+
+  // A rethrow of a foreign exception will be removed from the
+  // the exception stack immediately by __cxa_rethrow.
+  if (!header)
+    return;
+
+  // A foreign exception couldn't have been stacked (see above),
+  // so by definition processing must be complete.
+  if (!__is_gxx_exception_class(header->unwindHeader.exception_class))
+    {
+      globals->caughtExceptions = 0;
+      _Unwind_DeleteException (&header->unwindHeader);
+      return;
+    }
+
+  int count = header->handlerCount;
+  if (count < 0)
+    {
+      // This exception was rethrown.  Decrement the (inverted) catch
+      // count and remove it from the chain when it reaches zero.
+      if (++count == 0)
+	globals->caughtExceptions = header->nextException;
+    }
+  else if (--count == 0)
+    {
+      // Handling for this exception is complete.  Destroy the object.
+      globals->caughtExceptions = header->nextException;
+      _Unwind_DeleteException (&header->unwindHeader);
+      return;
+    }
+  else if (count < 0)
+    // A bug in the exception handling library or compiler.
+    std::terminate ();
+
+  header->handlerCount = count;
+}
+
+
+bool
+std::uncaught_exception() throw()
+{
+  __cxa_eh_globals *globals = __cxa_get_globals ();
+  return globals->uncaughtExceptions != 0;
+}