Mercurial > hg > truffle
annotate src/share/vm/memory/referencePolicy.hpp @ 15177:66e3af78ea96
HSAIL: added safepoint support
Contributed-by: Eric Caspole <eric.caspole@amd.com>
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 17 Apr 2014 00:44:32 +0200 |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_MEMORY_REFERENCEPOLICY_HPP |
26 #define SHARE_VM_MEMORY_REFERENCEPOLICY_HPP | |
27 | |
0 | 28 // referencePolicy is used to determine when soft reference objects |
29 // should be cleared. | |
30 | |
31 | |
6197 | 32 class ReferencePolicy : public CHeapObj<mtGC> { |
0 | 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 */ } |
0 | 41 }; |
42 | |
43 class NeverClearPolicy : public ReferencePolicy { | |
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 } |
0 | 48 }; |
49 | |
50 class AlwaysClearPolicy : public ReferencePolicy { | |
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 } |
0 | 55 }; |
56 | |
57 class LRUCurrentHeapPolicy : public ReferencePolicy { | |
58 private: | |
59 jlong _max_interval; | |
60 | |
61 public: | |
62 LRUCurrentHeapPolicy(); | |
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); |
0 | 67 }; |
68 | |
69 class LRUMaxHeapPolicy : public ReferencePolicy { | |
70 private: | |
71 jlong _max_interval; | |
72 | |
73 public: | |
74 LRUMaxHeapPolicy(); | |
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); |
0 | 79 }; |
1972 | 80 |
81 #endif // SHARE_VM_MEMORY_REFERENCEPOLICY_HPP |