Mercurial > jdk8-mips64-public > hotspot / annotate
src/share/vm/runtime/basicLock.hpp@9de67bf4244d (annotated)
src/share/vm/runtime/basicLock.hpp
Tue, 02 Nov 2010 16:02:46 -0700
- author
- iveresov
- date
- Tue, 02 Nov 2010 16:02:46 -0700
- changeset 2246
- 9de67bf4244d
- parent 2233
- fa83ab460c54
- child 2314
- f95d63e2154a
- permissions
- -rw-r--r--
6996136: VM crash in src/share/vm/runtime/virtualspace.cpp:424
Summary: Turn CDS off if compressed oops is on
Reviewed-by: ysr, kvn, jcoomes, phh
| acorn@2233 | 1 | /* |
| acorn@2233 | 2 | * Copyright (c) 1998, 2007, Oracle and/or its affiliates. All rights reserved. |
| acorn@2233 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| acorn@2233 | 4 | * |
| acorn@2233 | 5 | * This code is free software; you can redistribute it and/or modify it |
| acorn@2233 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| acorn@2233 | 7 | * published by the Free Software Foundation. |
| acorn@2233 | 8 | * |
| acorn@2233 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| acorn@2233 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| acorn@2233 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| acorn@2233 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| acorn@2233 | 13 | * accompanied this code). |
| acorn@2233 | 14 | * |
| acorn@2233 | 15 | * You should have received a copy of the GNU General Public License version |
| acorn@2233 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| acorn@2233 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| acorn@2233 | 18 | * |
| acorn@2233 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| acorn@2233 | 20 | * or visit www.oracle.com if you need additional information or have any |
| acorn@2233 | 21 | * questions. |
| acorn@2233 | 22 | * |
| acorn@2233 | 23 | */ |
| acorn@2233 | 24 | |
| acorn@2233 | 25 | class BasicLock VALUE_OBJ_CLASS_SPEC { |
| acorn@2233 | 26 | friend class VMStructs; |
| acorn@2233 | 27 | private: |
| acorn@2233 | 28 | volatile markOop _displaced_header; |
| acorn@2233 | 29 | public: |
| acorn@2233 | 30 | markOop displaced_header() const { return _displaced_header; } |
| acorn@2233 | 31 | void set_displaced_header(markOop header) { _displaced_header = header; } |
| acorn@2233 | 32 | |
| acorn@2233 | 33 | void print_on(outputStream* st) const; |
| acorn@2233 | 34 | |
| acorn@2233 | 35 | // move a basic lock (used during deoptimization |
| acorn@2233 | 36 | void move_to(oop obj, BasicLock* dest); |
| acorn@2233 | 37 | |
| acorn@2233 | 38 | static int displaced_header_offset_in_bytes() { return offset_of(BasicLock, _displaced_header); } |
| acorn@2233 | 39 | }; |
| acorn@2233 | 40 | |
| acorn@2233 | 41 | // A BasicObjectLock associates a specific Java object with a BasicLock. |
| acorn@2233 | 42 | // It is currently embedded in an interpreter frame. |
| acorn@2233 | 43 | |
| acorn@2233 | 44 | // Because some machines have alignment restrictions on the control stack, |
| acorn@2233 | 45 | // the actual space allocated by the interpreter may include padding words |
| acorn@2233 | 46 | // after the end of the BasicObjectLock. Also, in order to guarantee |
| acorn@2233 | 47 | // alignment of the embedded BasicLock objects on such machines, we |
| acorn@2233 | 48 | // put the embedded BasicLock at the beginning of the struct. |
| acorn@2233 | 49 | |
| acorn@2233 | 50 | class BasicObjectLock VALUE_OBJ_CLASS_SPEC { |
| acorn@2233 | 51 | friend class VMStructs; |
| acorn@2233 | 52 | private: |
| acorn@2233 | 53 | BasicLock _lock; // the lock, must be double word aligned |
| acorn@2233 | 54 | oop _obj; // object holds the lock; |
| acorn@2233 | 55 | |
| acorn@2233 | 56 | public: |
| acorn@2233 | 57 | // Manipulation |
| acorn@2233 | 58 | oop obj() const { return _obj; } |
| acorn@2233 | 59 | void set_obj(oop obj) { _obj = obj; } |
| acorn@2233 | 60 | BasicLock* lock() { return &_lock; } |
| acorn@2233 | 61 | |
| acorn@2233 | 62 | // Note: Use frame::interpreter_frame_monitor_size() for the size of BasicObjectLocks |
| acorn@2233 | 63 | // in interpreter activation frames since it includes machine-specific padding. |
| acorn@2233 | 64 | static int size() { return sizeof(BasicObjectLock)/wordSize; } |
| acorn@2233 | 65 | |
| acorn@2233 | 66 | // GC support |
| acorn@2233 | 67 | void oops_do(OopClosure* f) { f->do_oop(&_obj); } |
| acorn@2233 | 68 | |
| acorn@2233 | 69 | static int obj_offset_in_bytes() { return offset_of(BasicObjectLock, _obj); } |
| acorn@2233 | 70 | static int lock_offset_in_bytes() { return offset_of(BasicObjectLock, _lock); } |
| acorn@2233 | 71 | }; |
| acorn@2233 | 72 |
