jdk8-mips64-public/hotspot: src/share/vm/services/serviceUtil.hpp@7bb995fbd3c0

     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  */

    25 //

    26 // Serviceability utility functions.

    27 // (Shared by MM and JVMTI).

    28 //

    29 class ServiceUtil : public AllStatic {

    30  public:

    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     }

    40     // ignore KlassKlass

    41     if (o->is_klass()) {

    42       return false;

    43     }

    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()

    89 };

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