aoqi@0: /*
aoqi@0:  * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #ifndef SHARE_VM_RUNTIME_BASICLOCK_HPP
aoqi@0: #define SHARE_VM_RUNTIME_BASICLOCK_HPP
aoqi@0: 
aoqi@0: #include "oops/markOop.hpp"
aoqi@0: #include "runtime/handles.hpp"
aoqi@0: #include "utilities/top.hpp"
aoqi@0: 
aoqi@0: class BasicLock VALUE_OBJ_CLASS_SPEC {
aoqi@0:   friend class VMStructs;
aoqi@0:  private:
aoqi@0:   volatile markOop _displaced_header;
aoqi@0:  public:
aoqi@0:   markOop      displaced_header() const               { return _displaced_header; }
aoqi@0:   void         set_displaced_header(markOop header)   { _displaced_header = header; }
aoqi@0: 
aoqi@0:   void print_on(outputStream* st) const;
aoqi@0: 
aoqi@0:   // move a basic lock (used during deoptimization
aoqi@0:   void move_to(oop obj, BasicLock* dest);
aoqi@0: 
aoqi@0:   static int displaced_header_offset_in_bytes()       { return offset_of(BasicLock, _displaced_header); }
aoqi@0: };
aoqi@0: 
aoqi@0: // A BasicObjectLock associates a specific Java object with a BasicLock.
aoqi@0: // It is currently embedded in an interpreter frame.
aoqi@0: 
aoqi@0: // Because some machines have alignment restrictions on the control stack,
aoqi@0: // the actual space allocated by the interpreter may include padding words
aoqi@0: // after the end of the BasicObjectLock.  Also, in order to guarantee
aoqi@0: // alignment of the embedded BasicLock objects on such machines, we
aoqi@0: // put the embedded BasicLock at the beginning of the struct.
aoqi@0: 
aoqi@0: class BasicObjectLock VALUE_OBJ_CLASS_SPEC {
aoqi@0:   friend class VMStructs;
aoqi@0:  private:
aoqi@0:   BasicLock _lock;                                    // the lock, must be double word aligned
aoqi@0:   oop       _obj;                                     // object holds the lock;
aoqi@0: 
aoqi@0:  public:
aoqi@0:   // Manipulation
aoqi@0:   oop      obj() const                                { return _obj;  }
aoqi@0:   void set_obj(oop obj)                               { _obj = obj; }
aoqi@0:   BasicLock* lock()                                   { return &_lock; }
aoqi@0: 
aoqi@0:   // Note: Use frame::interpreter_frame_monitor_size() for the size of BasicObjectLocks
aoqi@0:   //       in interpreter activation frames since it includes machine-specific padding.
aoqi@0:   static int size()                                   { return sizeof(BasicObjectLock)/wordSize; }
aoqi@0: 
aoqi@0:   // GC support
aoqi@0:   void oops_do(OopClosure* f) { f->do_oop(&_obj); }
aoqi@0: 
aoqi@0:   static int obj_offset_in_bytes()                    { return offset_of(BasicObjectLock, _obj);  }
aoqi@0:   static int lock_offset_in_bytes()                   { return offset_of(BasicObjectLock, _lock); }
aoqi@0: };
aoqi@0: 
aoqi@0: 
aoqi@0: #endif // SHARE_VM_RUNTIME_BASICLOCK_HPP