|
1878
|
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
|
