Karen Kinnear | 22929fb | 2010-10-22 15:59:34 -0400 | [diff] [blame] | 1 | /* |
Stefan Karlsson | 8006fe8 | 2010-11-23 13:22:55 -0800 | [diff] [blame] | 2 | * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved. |
Karen Kinnear | 22929fb | 2010-10-22 15:59:34 -0400 | [diff] [blame] | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| 13 | * accompanied this code). |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License version |
| 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| 20 | * or visit www.oracle.com if you need additional information or have any |
| 21 | * questions. |
| 22 | * |
| 23 | */ |
| 24 | |
Stefan Karlsson | 8006fe8 | 2010-11-23 13:22:55 -0800 | [diff] [blame] | 25 | #ifndef SHARE_VM_RUNTIME_BASICLOCK_HPP |
| 26 | #define SHARE_VM_RUNTIME_BASICLOCK_HPP |
| 27 | |
| 28 | #include "oops/markOop.hpp" |
| 29 | #include "runtime/handles.hpp" |
| 30 | #include "utilities/top.hpp" |
| 31 | |
Karen Kinnear | 22929fb | 2010-10-22 15:59:34 -0400 | [diff] [blame] | 32 | class BasicLock VALUE_OBJ_CLASS_SPEC { |
| 33 | friend class VMStructs; |
Christian Thalinger | bf5db72 | 2015-12-14 17:02:02 -1000 | [diff] [blame] | 34 | friend class JVMCIVMStructs; |
Karen Kinnear | 22929fb | 2010-10-22 15:59:34 -0400 | [diff] [blame] | 35 | private: |
| 36 | volatile markOop _displaced_header; |
| 37 | public: |
| 38 | markOop displaced_header() const { return _displaced_header; } |
| 39 | void set_displaced_header(markOop header) { _displaced_header = header; } |
| 40 | |
| 41 | void print_on(outputStream* st) const; |
| 42 | |
| 43 | // move a basic lock (used during deoptimization |
| 44 | void move_to(oop obj, BasicLock* dest); |
| 45 | |
| 46 | static int displaced_header_offset_in_bytes() { return offset_of(BasicLock, _displaced_header); } |
| 47 | }; |
| 48 | |
| 49 | // A BasicObjectLock associates a specific Java object with a BasicLock. |
| 50 | // It is currently embedded in an interpreter frame. |
| 51 | |
| 52 | // Because some machines have alignment restrictions on the control stack, |
| 53 | // the actual space allocated by the interpreter may include padding words |
| 54 | // after the end of the BasicObjectLock. Also, in order to guarantee |
| 55 | // alignment of the embedded BasicLock objects on such machines, we |
| 56 | // put the embedded BasicLock at the beginning of the struct. |
| 57 | |
| 58 | class BasicObjectLock VALUE_OBJ_CLASS_SPEC { |
| 59 | friend class VMStructs; |
| 60 | private: |
| 61 | BasicLock _lock; // the lock, must be double word aligned |
| 62 | oop _obj; // object holds the lock; |
| 63 | |
| 64 | public: |
| 65 | // Manipulation |
| 66 | oop obj() const { return _obj; } |
| 67 | void set_obj(oop obj) { _obj = obj; } |
| 68 | BasicLock* lock() { return &_lock; } |
| 69 | |
| 70 | // Note: Use frame::interpreter_frame_monitor_size() for the size of BasicObjectLocks |
| 71 | // in interpreter activation frames since it includes machine-specific padding. |
| 72 | static int size() { return sizeof(BasicObjectLock)/wordSize; } |
| 73 | |
| 74 | // GC support |
| 75 | void oops_do(OopClosure* f) { f->do_oop(&_obj); } |
| 76 | |
| 77 | static int obj_offset_in_bytes() { return offset_of(BasicObjectLock, _obj); } |
| 78 | static int lock_offset_in_bytes() { return offset_of(BasicObjectLock, _lock); } |
| 79 | }; |
| 80 | |
Stefan Karlsson | 8006fe8 | 2010-11-23 13:22:55 -0800 | [diff] [blame] | 81 | |
| 82 | #endif // SHARE_VM_RUNTIME_BASICLOCK_HPP |