serviceUtil.hpp revision 3602:da91efe96a93 
1/*
2 * Copyright (c) 2003, 2012, 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.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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24
25#ifndef SHARE_VM_SERVICES_SERVICEUTIL_HPP
26#define SHARE_VM_SERVICES_SERVICEUTIL_HPP
27
28#include "classfile/systemDictionary.hpp"
29#include "oops/objArrayOop.hpp"
30
31//
32// Serviceability utility functions.
33// (Shared by MM and JVMTI).
34//
35class ServiceUtil : public AllStatic {
36 public:
37
38  // Return true if oop represents an object that is "visible"
39  // to the java world.
40  static inline bool visible_oop(oop o) {
41    // the sentinel for deleted handles isn't visible
42    if (o == JNIHandles::deleted_handle()) {
43      return false;
44    }
45
46    // instance
47    if (o->is_instance()) {
48      // instance objects are visible
49      if (o->klass() != SystemDictionary::Class_klass()) {
50        return true;
51      }
52      if (java_lang_Class::is_primitive(o)) {
53        return true;
54      }
55      // java.lang.Classes are visible
56      Klass* k = java_lang_Class::as_Klass(o);
57      if (k->is_klass()) {
58        // if it's a class for an object, an object array, or
59        // primitive (type) array then it's visible.
60        Klass* klass = k;
61        if (Klass::cast(klass)->oop_is_instance()) {
62          return true;
63        }
64        if (Klass::cast(klass)->oop_is_objArray()) {
65          return true;
66        }
67        if (Klass::cast(klass)->oop_is_typeArray()) {
68          return true;
69        }
70      }
71      return false;
72    }
73    // object arrays are visible if they aren't system object arrays
74    if (o->is_objArray()) {
75        return true;
76    }
77    // type arrays are visible
78    if (o->is_typeArray()) {
79      return true;
80    }
81    // everything else (Method*s, ...) aren't visible
82    return false;
83  };   // end of visible_oop()
84
85};
86
87#endif // SHARE_VM_SERVICES_SERVICEUTIL_HPP
88