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comparison src/share/vm/services/serviceUtil.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children 4ce7240d622c
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2003 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 //
26 // Serviceability utility functions.
27 // (Shared by MM and JVMTI).
28 //
29 class ServiceUtil : public AllStatic {
30 public:
31
32 // Return true if oop represents an object that is "visible"
33 // to the java world.
34 static inline bool visible_oop(oop o) {
35 // the sentinel for deleted handles isn't visible
36 if (o == JNIHandles::deleted_handle()) {
37 return false;
38 }
39
40 // ignore KlassKlass
41 if (o->is_klass()) {
42 return false;
43 }
44
45 // instance
46 if (o->is_instance()) {
47 // instance objects are visible
48 if (o->klass() != SystemDictionary::class_klass()) {
49 return true;
50 }
51 if (java_lang_Class::is_primitive(o)) {
52 return true;
53 }
54 // java.lang.Classes are visible
55 o = java_lang_Class::as_klassOop(o);
56 if (o->is_klass()) {
57 // if it's a class for an object, an object array, or
58 // primitive (type) array then it's visible.
59 klassOop klass = (klassOop)o;
60 if (Klass::cast(klass)->oop_is_instance()) {
61 return true;
62 }
63 if (Klass::cast(klass)->oop_is_objArray()) {
64 return true;
65 }
66 if (Klass::cast(klass)->oop_is_typeArray()) {
67 return true;
68 }
69 }
70 return false;
71 }
72 // object arrays are visible if they aren't system object arrays
73 if (o->is_objArray()) {
74 objArrayOop array = (objArrayOop)o;
75 if (array->klass() != Universe::systemObjArrayKlassObj()) {
76 return true;
77 } else {
78 return false;
79 }
80 }
81 // type arrays are visible
82 if (o->is_typeArray()) {
83 return true;
84 }
85 // everything else (methodOops, ...) aren't visible
86 return false;
87 }; // end of visible_oop()
88
89 };