Mercurial > hg > truffle
view src/share/vm/runtime/basicLock.hpp @ 4877:c03e06373b47
Merge
author | stefank |
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date | Sat, 28 Jan 2012 01:15:34 -0800 |
parents | f95d63e2154a |
children | 3dbcd1013cc8 |
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/* * 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