Mercurial > hg > graal-compiler
comparison src/share/vm/runtime/basicLock.hpp @ 1878:fa83ab460c54
6988353: refactor contended sync subsystem
Summary: reduce complexity by factoring synchronizer.cpp
Reviewed-by: dholmes, never, coleenp
author | acorn |
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date | Fri, 22 Oct 2010 15:59:34 -0400 |
parents | |
children | f95d63e2154a |
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1874:75ab0162aa84 | 1878:fa83ab460c54 |
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1 /* | |
2 * Copyright (c) 1998, 2007, Oracle and/or its affiliates. All rights reserved. | |
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 | |
25 class BasicLock VALUE_OBJ_CLASS_SPEC { | |
26 friend class VMStructs; | |
27 private: | |
28 volatile markOop _displaced_header; | |
29 public: | |
30 markOop displaced_header() const { return _displaced_header; } | |
31 void set_displaced_header(markOop header) { _displaced_header = header; } | |
32 | |
33 void print_on(outputStream* st) const; | |
34 | |
35 // move a basic lock (used during deoptimization | |
36 void move_to(oop obj, BasicLock* dest); | |
37 | |
38 static int displaced_header_offset_in_bytes() { return offset_of(BasicLock, _displaced_header); } | |
39 }; | |
40 | |
41 // A BasicObjectLock associates a specific Java object with a BasicLock. | |
42 // It is currently embedded in an interpreter frame. | |
43 | |
44 // Because some machines have alignment restrictions on the control stack, | |
45 // the actual space allocated by the interpreter may include padding words | |
46 // after the end of the BasicObjectLock. Also, in order to guarantee | |
47 // alignment of the embedded BasicLock objects on such machines, we | |
48 // put the embedded BasicLock at the beginning of the struct. | |
49 | |
50 class BasicObjectLock VALUE_OBJ_CLASS_SPEC { | |
51 friend class VMStructs; | |
52 private: | |
53 BasicLock _lock; // the lock, must be double word aligned | |
54 oop _obj; // object holds the lock; | |
55 | |
56 public: | |
57 // Manipulation | |
58 oop obj() const { return _obj; } | |
59 void set_obj(oop obj) { _obj = obj; } | |
60 BasicLock* lock() { return &_lock; } | |
61 | |
62 // Note: Use frame::interpreter_frame_monitor_size() for the size of BasicObjectLocks | |
63 // in interpreter activation frames since it includes machine-specific padding. | |
64 static int size() { return sizeof(BasicObjectLock)/wordSize; } | |
65 | |
66 // GC support | |
67 void oops_do(OopClosure* f) { f->do_oop(&_obj); } | |
68 | |
69 static int obj_offset_in_bytes() { return offset_of(BasicObjectLock, _obj); } | |
70 static int lock_offset_in_bytes() { return offset_of(BasicObjectLock, _lock); } | |
71 }; | |
72 |