--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/prims/stackwalk.hpp	Mon Nov 23 12:44:43 2015 -0800
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+
+#ifndef SHARE_VM_PRIMS_STACKWALK_HPP
+#define SHARE_VM_PRIMS_STACKWALK_HPP
+
+#include "oops/oop.hpp"
+#include "runtime/vframe.hpp"
+
+class StackWalkAnchor : public StackObj {
+private:
+  enum {
+    magic_pos = 0
+  };
+
+  JavaThread*           _thread;
+  vframeStream          _vfst;
+  jlong                 _anchor;
+public:
+  StackWalkAnchor(JavaThread* thread)
+    : _thread(thread), _vfst(thread), _anchor(0L) {}
+
+  vframeStream&   vframe_stream()         { return _vfst; }
+  JavaThread*     thread()                { return _thread; }
+
+  void setup_magic_on_entry(objArrayHandle classes_array);
+  bool check_magic(objArrayHandle classes_array);
+  bool cleanup_magic_on_exit(objArrayHandle classes_array);
+
+  bool is_valid_in(Thread* thread, objArrayHandle classes_array) {
+    return (_thread == thread && check_magic(classes_array));
+  }
+
+  jlong address_value() {
+    return (jlong) castable_address(this);
+  }
+
+  static StackWalkAnchor* from_current(JavaThread* thread, jlong anchor, objArrayHandle frames_array);
+};
+
+class StackWalk : public AllStatic {
+private:
+  static int fill_in_frames(jlong mode, vframeStream& vfst,
+                            int max_nframes, int start_index,
+                            objArrayHandle classes_array,
+                            objArrayHandle frames_array,
+                            int& end_index, TRAPS);
+
+  static void fill_stackframe(Handle stackFrame, const methodHandle& method, int bci);
+
+  static void fill_live_stackframe(Handle stackFrame, const methodHandle& method, int bci,
+                                   javaVFrame* jvf, TRAPS);
+
+  static inline bool skip_hidden_frames(int mode) {
+    return (mode & JVM_STACKWALK_SHOW_HIDDEN_FRAMES) == 0;
+  }
+  static inline bool need_method_info(int mode) {
+    return (mode & JVM_STACKWALK_FILL_CLASS_REFS_ONLY) == 0;
+  }
+  static inline bool live_frame_info(int mode) {
+    return (mode & JVM_STACKWALK_FILL_LIVE_STACK_FRAMES) != 0;
+  }
+  static inline bool fill_in_stacktrace(int mode) {
+    return (mode & JVM_STACKWALK_FILTER_FILL_IN_STACK_TRACE) != 0;
+  }
+
+public:
+  static oop walk(Handle stackStream, jlong mode,
+                  int skip_frames, int frame_count, int start_index,
+                  objArrayHandle classes_array,
+                  objArrayHandle frames_array,
+                  TRAPS);
+
+  static jint moreFrames(Handle stackStream, jlong mode, jlong magic,
+                         int frame_count, int start_index,
+                         objArrayHandle classes_array,
+                         objArrayHandle frames_array,
+                         TRAPS);
+};
+#endif // SHARE_VM_PRIMS_STACKWALK_HPP