jdk8-mips64-public/hotspot: src/share/vm/jfr/leakprofiler/chains/edge.hpp@8e875c964f41

8214542: JFR: Old Object Sample event slow on a deep heap in debug builds
Reviewed-by: egahlin, rwestberg

     1 /*

     2  * Copyright (c) 2014, 2018, 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_JFR_LEAKPROFILER_CHAINS_EDGE_HPP

    26 #define SHARE_VM_JFR_LEAKPROFILER_CHAINS_EDGE_HPP

    28 #include "memory/allocation.hpp"

    29 #include "oops/oopsHierarchy.hpp"

    31 class Edge {

    32  protected:

    33   const Edge* _parent;

    34   const oop* _reference;

    35  public:

    36   Edge();

    37   Edge(const Edge* parent, const oop* reference);

    39   const oop* reference() const {

    40     return _reference;

    41   }

    42   const Edge* parent() const {

    43     return _parent;

    44   }

    45   bool is_root() const {

    46     return _parent == NULL;

    47   }

    48   const oop pointee() const;

    49   const Klass* pointee_klass() const;

    50   const oop reference_owner() const;

    51   const Klass* reference_owner_klass() const;

    52   size_t distance_to_root() const;

    54   void* operator new (size_t sz, void* here) {

    55     return here;

    56   }

    57 };

    59 #endif // SHARE_VM_JFR_LEAKPROFILER_CHAINS_EDGE_HPP

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