Mercurial > hg > graal-compiler
view src/share/vm/memory/referencePolicy.hpp @ 12090:8009adb44523
Merge
author | jmasa |
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date | Thu, 22 Aug 2013 14:03:47 -0700 |
parents | b9a9ed0f8eeb |
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/* * Copyright (c) 2000, 2012, 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<mtGC> { public: virtual bool should_clear_reference(oop p, jlong timestamp_clock) { ShouldNotReachHere(); return true; } // Capture state (of-the-VM) information needed to evaluate the policy virtual void setup() { /* do nothing */ } }; class NeverClearPolicy : public ReferencePolicy { public: virtual bool should_clear_reference(oop p, jlong timestamp_clock) { return false; } }; class AlwaysClearPolicy : public ReferencePolicy { public: virtual bool should_clear_reference(oop p, jlong timestamp_clock) { 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(); virtual bool should_clear_reference(oop p, jlong timestamp_clock); }; class LRUMaxHeapPolicy : public ReferencePolicy { private: jlong _max_interval; public: LRUMaxHeapPolicy(); // Capture state (of-the-VM) information needed to evaluate the policy void setup(); virtual bool should_clear_reference(oop p, jlong timestamp_clock); }; #endif // SHARE_VM_MEMORY_REFERENCEPOLICY_HPP