jdk8-mips64-public/hotspot: src/share/vm/services/serviceUtil.hpp@17c778814856

6811367: Fix code in HeapDumper::dump_heap() to avoid buffer overrun
Summary: Check buffer size before using and use dynamic buffer sizes for subsequent calls.
Reviewed-by: kamg, dholmes

     1 /*

     2  * Copyright (c) 2003, 2010, 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  */

    25 #ifndef SHARE_VM_SERVICES_SERVICEUTIL_HPP

    26 #define SHARE_VM_SERVICES_SERVICEUTIL_HPP

    28 #include "classfile/systemDictionary.hpp"

    29 #include "oops/objArrayOop.hpp"

    31 //

    32 // Serviceability utility functions.

    33 // (Shared by MM and JVMTI).

    34 //

    35 class ServiceUtil : public AllStatic {

    36  public:

    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     }

    46     // ignore KlassKlass

    47     if (o->is_klass()) {

    48       return false;

    49     }

    51     // instance

    52     if (o->is_instance()) {

    53       // instance objects are visible

    54       if (o->klass() != SystemDictionary::Class_klass()) {

    55         return true;

    56       }

    57       if (java_lang_Class::is_primitive(o)) {

    58         return true;

    59       }

    60       // java.lang.Classes are visible

    61       o = java_lang_Class::as_klassOop(o);

    62       if (o->is_klass()) {

    63         // if it's a class for an object, an object array, or

    64         // primitive (type) array then it's visible.

    65         klassOop klass = (klassOop)o;

    66         if (Klass::cast(klass)->oop_is_instance()) {

    67           return true;

    68         }

    69         if (Klass::cast(klass)->oop_is_objArray()) {

    70           return true;

    71         }

    72         if (Klass::cast(klass)->oop_is_typeArray()) {

    73           return true;

    74         }

    75       }

    76       return false;

    77     }

    78     // object arrays are visible if they aren't system object arrays

    79     if (o->is_objArray()) {

    80       objArrayOop array = (objArrayOop)o;

    81       if (array->klass() != Universe::systemObjArrayKlassObj()) {

    82         return true;

    83       } else {

    84         return false;

    85       }

    86     }

    87     // type arrays are visible

    88     if (o->is_typeArray()) {

    89       return true;

    90     }

    91     // everything else (methodOops, ...) aren't visible

    92     return false;

    93   };   // end of visible_oop()

    95 };

    97 #endif // SHARE_VM_SERVICES_SERVICEUTIL_HPP

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/services/serviceUtil.hpp@17c778814856

src/share/vm/services/serviceUtil.hpp