1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000 1.2 +++ b/src/share/vm/runtime/basicLock.hpp Wed Apr 27 01:25:04 2016 +0800 1.3 @@ -0,0 +1,81 @@ 1.4 +/* 1.5 + * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved. 1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 1.7 + * 1.8 + * This code is free software; you can redistribute it and/or modify it 1.9 + * under the terms of the GNU General Public License version 2 only, as 1.10 + * published by the Free Software Foundation. 1.11 + * 1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT 1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1.15 + * version 2 for more details (a copy is included in the LICENSE file that 1.16 + * accompanied this code). 1.17 + * 1.18 + * You should have received a copy of the GNU General Public License version 1.19 + * 2 along with this work; if not, write to the Free Software Foundation, 1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 1.21 + * 1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 1.23 + * or visit www.oracle.com if you need additional information or have any 1.24 + * questions. 1.25 + * 1.26 + */ 1.27 + 1.28 +#ifndef SHARE_VM_RUNTIME_BASICLOCK_HPP 1.29 +#define SHARE_VM_RUNTIME_BASICLOCK_HPP 1.30 + 1.31 +#include "oops/markOop.hpp" 1.32 +#include "runtime/handles.hpp" 1.33 +#include "utilities/top.hpp" 1.34 + 1.35 +class BasicLock VALUE_OBJ_CLASS_SPEC { 1.36 + friend class VMStructs; 1.37 + private: 1.38 + volatile markOop _displaced_header; 1.39 + public: 1.40 + markOop displaced_header() const { return _displaced_header; } 1.41 + void set_displaced_header(markOop header) { _displaced_header = header; } 1.42 + 1.43 + void print_on(outputStream* st) const; 1.44 + 1.45 + // move a basic lock (used during deoptimization 1.46 + void move_to(oop obj, BasicLock* dest); 1.47 + 1.48 + static int displaced_header_offset_in_bytes() { return offset_of(BasicLock, _displaced_header); } 1.49 +}; 1.50 + 1.51 +// A BasicObjectLock associates a specific Java object with a BasicLock. 1.52 +// It is currently embedded in an interpreter frame. 1.53 + 1.54 +// Because some machines have alignment restrictions on the control stack, 1.55 +// the actual space allocated by the interpreter may include padding words 1.56 +// after the end of the BasicObjectLock. Also, in order to guarantee 1.57 +// alignment of the embedded BasicLock objects on such machines, we 1.58 +// put the embedded BasicLock at the beginning of the struct. 1.59 + 1.60 +class BasicObjectLock VALUE_OBJ_CLASS_SPEC { 1.61 + friend class VMStructs; 1.62 + private: 1.63 + BasicLock _lock; // the lock, must be double word aligned 1.64 + oop _obj; // object holds the lock; 1.65 + 1.66 + public: 1.67 + // Manipulation 1.68 + oop obj() const { return _obj; } 1.69 + void set_obj(oop obj) { _obj = obj; } 1.70 + BasicLock* lock() { return &_lock; } 1.71 + 1.72 + // Note: Use frame::interpreter_frame_monitor_size() for the size of BasicObjectLocks 1.73 + // in interpreter activation frames since it includes machine-specific padding. 1.74 + static int size() { return sizeof(BasicObjectLock)/wordSize; } 1.75 + 1.76 + // GC support 1.77 + void oops_do(OopClosure* f) { f->do_oop(&_obj); } 1.78 + 1.79 + static int obj_offset_in_bytes() { return offset_of(BasicObjectLock, _obj); } 1.80 + static int lock_offset_in_bytes() { return offset_of(BasicObjectLock, _lock); } 1.81 +}; 1.82 + 1.83 + 1.84 +#endif // SHARE_VM_RUNTIME_BASICLOCK_HPP