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annotate src/share/vm/memory/referencePolicy.hpp @ 12146:9758d9f36299

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8021954: VM SIGSEGV during classloading on MacOS; hs_err_pid file produced Summary: declare all user-defined operator new()s within Hotspot code with the empty throw() exception specification Reviewed-by: coleenp, twisti, dholmes, hseigel, dcubed, kvn, ccheung Contributed-by: lois.foltan@oracle.com
author coleenp
date Thu, 29 Aug 2013 18:56:29 -0400
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1 /*
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2 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_MEMORY_REFERENCEPOLICY_HPP
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26 #define SHARE_VM_MEMORY_REFERENCEPOLICY_HPP
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27
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28 // referencePolicy is used to determine when soft reference objects
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29 // should be cleared.
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31
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32 class ReferencePolicy : public CHeapObj<mtGC> {
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33 public:
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34 virtual bool should_clear_reference(oop p, jlong timestamp_clock) {
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35 ShouldNotReachHere();
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36 return true;
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37 }
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38
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39 // Capture state (of-the-VM) information needed to evaluate the policy
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40 virtual void setup() { /* do nothing */ }
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41 };
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42
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43 class NeverClearPolicy : public ReferencePolicy {
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44 public:
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45 virtual bool should_clear_reference(oop p, jlong timestamp_clock) {
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46 return false;
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47 }
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48 };
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49
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50 class AlwaysClearPolicy : public ReferencePolicy {
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51 public:
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52 virtual bool should_clear_reference(oop p, jlong timestamp_clock) {
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53 return true;
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54 }
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55 };
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56
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57 class LRUCurrentHeapPolicy : public ReferencePolicy {
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58 private:
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59 jlong _max_interval;
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61 public:
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62 LRUCurrentHeapPolicy();
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63
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64 // Capture state (of-the-VM) information needed to evaluate the policy
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65 void setup();
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66 virtual bool should_clear_reference(oop p, jlong timestamp_clock);
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67 };
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69 class LRUMaxHeapPolicy : public ReferencePolicy {
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70 private:
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71 jlong _max_interval;
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73 public:
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74 LRUMaxHeapPolicy();
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75
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76 // Capture state (of-the-VM) information needed to evaluate the policy
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77 void setup();
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78 virtual bool should_clear_reference(oop p, jlong timestamp_clock);
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79 };
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81 #endif // SHARE_VM_MEMORY_REFERENCEPOLICY_HPP