| /* |
| * 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 |