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src/share/vm/runtime/basicLock.hpp@91ddc23482a4 (annotated)
src/share/vm/runtime/basicLock.hpp
Thu, 24 May 2018 20:03:11 +0800
- author
- aoqi
- date
- Thu, 24 May 2018 20:03:11 +0800
- changeset 8868
- 91ddc23482a4
- parent 6876
- 710a3c8b516e
- permissions
- -rw-r--r--
Increase MaxHeapSize for better performance on MIPS
| aoqi@0 | 1 | /* |
| aoqi@0 | 2 | * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved. |
| aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| aoqi@0 | 4 | * |
| aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
| aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| aoqi@0 | 7 | * published by the Free Software Foundation. |
| aoqi@0 | 8 | * |
| aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| aoqi@0 | 13 | * accompanied this code). |
| aoqi@0 | 14 | * |
| aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
| aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| aoqi@0 | 18 | * |
| aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
| aoqi@0 | 21 | * questions. |
| aoqi@0 | 22 | * |
| aoqi@0 | 23 | */ |
| aoqi@0 | 24 | |
| aoqi@0 | 25 | #ifndef SHARE_VM_RUNTIME_BASICLOCK_HPP |
| aoqi@0 | 26 | #define SHARE_VM_RUNTIME_BASICLOCK_HPP |
| aoqi@0 | 27 | |
| aoqi@0 | 28 | #include "oops/markOop.hpp" |
| aoqi@0 | 29 | #include "runtime/handles.hpp" |
| aoqi@0 | 30 | #include "utilities/top.hpp" |
| aoqi@0 | 31 | |
| aoqi@0 | 32 | class BasicLock VALUE_OBJ_CLASS_SPEC { |
| aoqi@0 | 33 | friend class VMStructs; |
| aoqi@0 | 34 | private: |
| aoqi@0 | 35 | volatile markOop _displaced_header; |
| aoqi@0 | 36 | public: |
| aoqi@0 | 37 | markOop displaced_header() const { return _displaced_header; } |
| aoqi@0 | 38 | void set_displaced_header(markOop header) { _displaced_header = header; } |
| aoqi@0 | 39 | |
| aoqi@0 | 40 | void print_on(outputStream* st) const; |
| aoqi@0 | 41 | |
| aoqi@0 | 42 | // move a basic lock (used during deoptimization |
| aoqi@0 | 43 | void move_to(oop obj, BasicLock* dest); |
| aoqi@0 | 44 | |
| aoqi@0 | 45 | static int displaced_header_offset_in_bytes() { return offset_of(BasicLock, _displaced_header); } |
| aoqi@0 | 46 | }; |
| aoqi@0 | 47 | |
| aoqi@0 | 48 | // A BasicObjectLock associates a specific Java object with a BasicLock. |
| aoqi@0 | 49 | // It is currently embedded in an interpreter frame. |
| aoqi@0 | 50 | |
| aoqi@0 | 51 | // Because some machines have alignment restrictions on the control stack, |
| aoqi@0 | 52 | // the actual space allocated by the interpreter may include padding words |
| aoqi@0 | 53 | // after the end of the BasicObjectLock. Also, in order to guarantee |
| aoqi@0 | 54 | // alignment of the embedded BasicLock objects on such machines, we |
| aoqi@0 | 55 | // put the embedded BasicLock at the beginning of the struct. |
| aoqi@0 | 56 | |
| aoqi@0 | 57 | class BasicObjectLock VALUE_OBJ_CLASS_SPEC { |
| aoqi@0 | 58 | friend class VMStructs; |
| aoqi@0 | 59 | private: |
| aoqi@0 | 60 | BasicLock _lock; // the lock, must be double word aligned |
| aoqi@0 | 61 | oop _obj; // object holds the lock; |
| aoqi@0 | 62 | |
| aoqi@0 | 63 | public: |
| aoqi@0 | 64 | // Manipulation |
| aoqi@0 | 65 | oop obj() const { return _obj; } |
| aoqi@0 | 66 | void set_obj(oop obj) { _obj = obj; } |
| aoqi@0 | 67 | BasicLock* lock() { return &_lock; } |
| aoqi@0 | 68 | |
| aoqi@0 | 69 | // Note: Use frame::interpreter_frame_monitor_size() for the size of BasicObjectLocks |
| aoqi@0 | 70 | // in interpreter activation frames since it includes machine-specific padding. |
| aoqi@0 | 71 | static int size() { return sizeof(BasicObjectLock)/wordSize; } |
| aoqi@0 | 72 | |
| aoqi@0 | 73 | // GC support |
| aoqi@0 | 74 | void oops_do(OopClosure* f) { f->do_oop(&_obj); } |
| aoqi@0 | 75 | |
| aoqi@0 | 76 | static int obj_offset_in_bytes() { return offset_of(BasicObjectLock, _obj); } |
| aoqi@0 | 77 | static int lock_offset_in_bytes() { return offset_of(BasicObjectLock, _lock); } |
| aoqi@0 | 78 | }; |
| aoqi@0 | 79 | |
| aoqi@0 | 80 | |
| aoqi@0 | 81 | #endif // SHARE_VM_RUNTIME_BASICLOCK_HPP |
