--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/prims/stackwalk.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,160 @@
+/*
+ * Copyright (c) 2015, 2017, 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"
+
+// BaseFrameStream is an abstract base class for encapsulating the VM-side
+// implementation of the StackWalker API.  There are two concrete subclasses:
+// - JavaFrameStream:
+//     -based on vframeStream; used in most instances
+// - LiveFrameStream:
+//     -based on javaVFrame; used for retrieving locals/monitors/operands for
+//      LiveStackFrame
+class BaseFrameStream : public StackObj {
+private:
+  enum {
+    magic_pos = 0
+  };
+
+  JavaThread*           _thread;
+  jlong                 _anchor;
+protected:
+  void fill_stackframe(Handle stackFrame, const methodHandle& method, TRAPS);
+public:
+  BaseFrameStream(JavaThread* thread) : _thread(thread), _anchor(0L) {}
+
+  virtual void    next()=0;
+  virtual bool    at_end()=0;
+
+  virtual Method* method()=0;
+  virtual int     bci()=0;
+
+  virtual void    fill_frame(int index, objArrayHandle  frames_array,
+                             const methodHandle& method, TRAPS)=0;
+
+  void setup_magic_on_entry(objArrayHandle frames_array);
+  bool check_magic(objArrayHandle frames_array);
+  bool cleanup_magic_on_exit(objArrayHandle frames_array);
+
+  bool is_valid_in(Thread* thread, objArrayHandle frames_array) {
+    return (_thread == thread && check_magic(frames_array));
+  }
+
+  jlong address_value() {
+    return (jlong) castable_address(this);
+  }
+
+  static BaseFrameStream* from_current(JavaThread* thread, jlong magic, objArrayHandle frames_array);
+};
+
+class JavaFrameStream : public BaseFrameStream {
+private:
+  vframeStream          _vfst;
+  bool                  _need_method_info;
+public:
+  JavaFrameStream(JavaThread* thread, int mode);
+
+  void next()      { _vfst.next();}
+  bool at_end()    { return _vfst.at_end(); }
+
+  Method* method() { return _vfst.method(); }
+  int bci()        { return _vfst.bci(); }
+
+  void fill_frame(int index, objArrayHandle  frames_array,
+                  const methodHandle& method, TRAPS);
+};
+
+class LiveFrameStream : public BaseFrameStream {
+private:
+  enum {
+    MODE_INTERPRETED = 0x01,
+    MODE_COMPILED    = 0x02
+  };
+
+  javaVFrame*           _jvf;
+
+  void fill_live_stackframe(Handle stackFrame, const methodHandle& method, TRAPS);
+  static oop create_primitive_slot_instance(StackValueCollection* values,
+                                            int i, BasicType type, TRAPS);
+  static objArrayHandle monitors_to_object_array(GrowableArray<MonitorInfo*>* monitors,
+                                                 TRAPS);
+  static objArrayHandle values_to_object_array(StackValueCollection* values, TRAPS);
+public:
+  LiveFrameStream(JavaThread* thread, RegisterMap* rm) : BaseFrameStream(thread) {
+    _jvf = thread->last_java_vframe(rm);
+  }
+
+  void next()      { _jvf = _jvf->java_sender(); }
+  bool at_end()    { return _jvf == NULL; }
+
+  Method* method() { return _jvf->method(); }
+  int bci()        { return _jvf->bci(); }
+
+  void fill_frame(int index, objArrayHandle  frames_array,
+                  const methodHandle& method, TRAPS);
+};
+
+class StackWalk : public AllStatic {
+private:
+  static int fill_in_frames(jlong mode, BaseFrameStream& stream,
+                            int max_nframes, int start_index,
+                            objArrayHandle frames_array,
+                            int& end_index, TRAPS);
+
+  static inline bool get_caller_class(int mode) {
+    return (mode & JVM_STACKWALK_GET_CALLER_CLASS) != 0;
+  }
+  static inline bool skip_hidden_frames(int mode) {
+    return (mode & JVM_STACKWALK_SHOW_HIDDEN_FRAMES) == 0;
+  }
+  static inline bool live_frame_info(int mode) {
+    return (mode & JVM_STACKWALK_FILL_LIVE_STACK_FRAMES) != 0;
+  }
+
+public:
+  static inline bool need_method_info(int mode) {
+    return (mode & JVM_STACKWALK_FILL_CLASS_REFS_ONLY) == 0;
+  }
+  static inline bool use_frames_array(int mode) {
+    return (mode & JVM_STACKWALK_FILL_CLASS_REFS_ONLY) == 0;
+  }
+  static oop walk(Handle stackStream, jlong mode,
+                  int skip_frames, int frame_count, int start_index,
+                  objArrayHandle frames_array,
+                  TRAPS);
+
+  static oop fetchFirstBatch(BaseFrameStream& stream, Handle stackStream,
+                             jlong mode, int skip_frames, int frame_count,
+                             int start_index, objArrayHandle frames_array, TRAPS);
+
+  static jint fetchNextBatch(Handle stackStream, jlong mode, jlong magic,
+                             int frame_count, int start_index,
+                             objArrayHandle frames_array, TRAPS);
+};
+#endif // SHARE_VM_PRIMS_STACKWALK_HPP