--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/utilities/preserveException.hpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,85 @@
+/*
+ * Copyright 1998-2006 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// This file provides more support for exception handling; see also exceptions.hpp
+class PreserveExceptionMark {
+ private:
+  Thread*     _thread;
+  Handle      _preserved_exception_oop;
+  int         _preserved_exception_line;
+  const char* _preserved_exception_file;
+
+ public:
+  PreserveExceptionMark(Thread*& thread);
+  ~PreserveExceptionMark();
+};
+
+
+// This is a clone of PreserveExceptionMark which asserts instead
+// of failing when what it wraps generates a pending exception.
+// It also addresses bug 6431341.
+class CautiouslyPreserveExceptionMark {
+ private:
+  Thread*     _thread;
+  Handle      _preserved_exception_oop;
+  int         _preserved_exception_line;
+  const char* _preserved_exception_file;
+
+ public:
+  CautiouslyPreserveExceptionMark(Thread* thread);
+  ~CautiouslyPreserveExceptionMark();
+};
+
+
+// Like PreserveExceptionMark but allows new exceptions to be generated in
+// the body of the mark. If a new exception is generated then the original one
+// is discarded.
+class WeakPreserveExceptionMark {
+private:
+  Thread*     _thread;
+  Handle      _preserved_exception_oop;
+  int         _preserved_exception_line;
+  const char* _preserved_exception_file;
+
+  void        preserve();
+  void        restore();
+
+  public:
+    WeakPreserveExceptionMark(Thread* pThread) :  _thread(pThread), _preserved_exception_oop()  {
+      if (pThread->has_pending_exception()) {
+        preserve();
+      }
+    }
+    ~WeakPreserveExceptionMark() {
+      if (_preserved_exception_oop.not_null()) {
+        restore();
+      }
+    }
+};
+
+
+
+// use global exception mark when allowing pending exception to be set and
+// saving and restoring them
+#define PRESERVE_EXCEPTION_MARK                    Thread* THREAD; PreserveExceptionMark __em(THREAD);