--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/cpu/zero/vm/javaFrameAnchor_zero.hpp	Tue Oct 13 12:04:21 2009 -0700
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2003-2005 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2007, 2008 Red Hat, Inc.
+ * 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.
+ *
+ */
+
+ public:
+  // Each arch must define reset, save, restore
+  // These are used by objects that only care about:
+  //  1 - initializing a new state (thread creation, javaCalls)
+  //  2 - saving a current state (javaCalls)
+  //  3 - restoring an old state (javaCalls)
+
+  void clear() {
+    // clearing _last_Java_sp must be first
+    _last_Java_sp = NULL;
+    // fence?
+    _last_Java_pc = NULL;
+  }
+
+  void copy(JavaFrameAnchor* src) {
+    // In order to make sure the transition state is valid for "this"
+    // We must clear _last_Java_sp before copying the rest of the new
+    // data
+    //
+    // Hack Alert: Temporary bugfix for 4717480/4721647 To act like
+    // previous version (pd_cache_state) don't NULL _last_Java_sp
+    // unless the value is changing
+    //
+    if (_last_Java_sp != src->_last_Java_sp)
+      _last_Java_sp = NULL;
+
+    _last_Java_pc = src->_last_Java_pc;
+    // Must be last so profiler will always see valid frame if
+    // has_last_frame() is true
+    _last_Java_sp = src->_last_Java_sp;
+  }
+
+  bool walkable() {
+    return true;
+  }
+
+  void make_walkable(JavaThread* thread) {
+    // nothing to do
+  }
+
+  intptr_t* last_Java_sp() const {
+    return _last_Java_sp;
+  }
+
+  void set_last_Java_sp(intptr_t* sp) {
+    _last_Java_sp = sp;
+  }