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1 /*
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2 * Copyright 2003 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 //
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26 // Serviceability utility functions.
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27 // (Shared by MM and JVMTI).
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28 //
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29 class ServiceUtil : public AllStatic {
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30 public:
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31
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32 // Return true if oop represents an object that is "visible"
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33 // to the java world.
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34 static inline bool visible_oop(oop o) {
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35 // the sentinel for deleted handles isn't visible
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36 if (o == JNIHandles::deleted_handle()) {
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37 return false;
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38 }
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39
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40 // ignore KlassKlass
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41 if (o->is_klass()) {
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42 return false;
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43 }
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44
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45 // instance
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46 if (o->is_instance()) {
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47 // instance objects are visible
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48 if (o->klass() != SystemDictionary::class_klass()) {
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49 return true;
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50 }
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51 if (java_lang_Class::is_primitive(o)) {
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52 return true;
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53 }
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54 // java.lang.Classes are visible
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55 o = java_lang_Class::as_klassOop(o);
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56 if (o->is_klass()) {
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57 // if it's a class for an object, an object array, or
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58 // primitive (type) array then it's visible.
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59 klassOop klass = (klassOop)o;
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60 if (Klass::cast(klass)->oop_is_instance()) {
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61 return true;
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62 }
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63 if (Klass::cast(klass)->oop_is_objArray()) {
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64 return true;
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65 }
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66 if (Klass::cast(klass)->oop_is_typeArray()) {
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67 return true;
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68 }
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69 }
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70 return false;
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71 }
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72 // object arrays are visible if they aren't system object arrays
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73 if (o->is_objArray()) {
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74 objArrayOop array = (objArrayOop)o;
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75 if (array->klass() != Universe::systemObjArrayKlassObj()) {
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76 return true;
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77 } else {
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78 return false;
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79 }
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80 }
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81 // type arrays are visible
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82 if (o->is_typeArray()) {
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83 return true;
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84 }
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85 // everything else (methodOops, ...) aren't visible
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86 return false;
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87 }; // end of visible_oop()
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88
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89 };
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