--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/runtime/basicLock.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 1998, 2010, 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_RUNTIME_BASICLOCK_HPP
+#define SHARE_VM_RUNTIME_BASICLOCK_HPP
+
+#include "oops/markOop.hpp"
+#include "runtime/handles.hpp"
+
+class BasicLock VALUE_OBJ_CLASS_SPEC {
+  friend class VMStructs;
+  friend class JVMCIVMStructs;
+ private:
+  volatile markOop _displaced_header;
+ public:
+  markOop      displaced_header() const               { return _displaced_header; }
+  void         set_displaced_header(markOop header)   { _displaced_header = header; }
+
+  void print_on(outputStream* st) const;
+
+  // move a basic lock (used during deoptimization
+  void move_to(oop obj, BasicLock* dest);
+
+  static int displaced_header_offset_in_bytes()       { return offset_of(BasicLock, _displaced_header); }
+};
+
+// A BasicObjectLock associates a specific Java object with a BasicLock.
+// It is currently embedded in an interpreter frame.
+
+// Because some machines have alignment restrictions on the control stack,
+// the actual space allocated by the interpreter may include padding words
+// after the end of the BasicObjectLock.  Also, in order to guarantee
+// alignment of the embedded BasicLock objects on such machines, we
+// put the embedded BasicLock at the beginning of the struct.
+
+class BasicObjectLock VALUE_OBJ_CLASS_SPEC {
+  friend class VMStructs;
+ private:
+  BasicLock _lock;                                    // the lock, must be double word aligned
+  oop       _obj;                                     // object holds the lock;
+
+ public:
+  // Manipulation
+  oop      obj() const                                { return _obj;  }
+  void set_obj(oop obj)                               { _obj = obj; }
+  BasicLock* lock()                                   { return &_lock; }
+
+  // Note: Use frame::interpreter_frame_monitor_size() for the size of BasicObjectLocks
+  //       in interpreter activation frames since it includes machine-specific padding.
+  static int size()                                   { return sizeof(BasicObjectLock)/wordSize; }
+
+  // GC support
+  void oops_do(OopClosure* f) { f->do_oop(&_obj); }
+
+  static int obj_offset_in_bytes()                    { return offset_of(BasicObjectLock, _obj);  }
+  static int lock_offset_in_bytes()                   { return offset_of(BasicObjectLock, _lock); }
+};
+
+
+#endif // SHARE_VM_RUNTIME_BASICLOCK_HPP