Mercurial > hg > truffle
view src/share/vm/memory/referencePolicy.hpp @ 3630:3b18b27b0dd4
IdealGraphVisualizer: When layouting a tree (or forest), do a final down-sweep in the crossing reduction phase. This usually gives a nicer layout for these types of graphs. Also, do a little cleanup and use arrays in the coordinate assignment phase.
author | Peter Hofer <peter.hofer@jku.at> |
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date | Mon, 14 Nov 2011 15:36:09 +0100 |
parents | f95d63e2154a |
children | d1bdeef3e3e2 |
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/* * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_MEMORY_REFERENCEPOLICY_HPP #define SHARE_VM_MEMORY_REFERENCEPOLICY_HPP // referencePolicy is used to determine when soft reference objects // should be cleared. class ReferencePolicy : public CHeapObj { public: virtual bool should_clear_reference(oop p) { ShouldNotReachHere(); return true; } // Capture state (of-the-VM) information needed to evaluate the policy virtual void setup() { /* do nothing */ } }; class NeverClearPolicy : public ReferencePolicy { public: bool should_clear_reference(oop p) { return false; } }; class AlwaysClearPolicy : public ReferencePolicy { public: bool should_clear_reference(oop p) { return true; } }; class LRUCurrentHeapPolicy : public ReferencePolicy { private: jlong _max_interval; public: LRUCurrentHeapPolicy(); // Capture state (of-the-VM) information needed to evaluate the policy void setup(); bool should_clear_reference(oop p); }; class LRUMaxHeapPolicy : public ReferencePolicy { private: jlong _max_interval; public: LRUMaxHeapPolicy(); // Capture state (of-the-VM) information needed to evaluate the policy void setup(); bool should_clear_reference(oop p); }; #endif // SHARE_VM_MEMORY_REFERENCEPOLICY_HPP