Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * 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"

 #include "utilities/top.hpp"

 class BasicLock VALUE_OBJ_CLASS_SPEC {

   friend class VMStructs;

  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