Mercurial > hg > truffle
annotate src/share/vm/memory/referencePolicy.hpp @ 3229:4a6bda6cfe28
Fix for usages that are phi in rematerialization
author | Gilles Duboscq <gilles.duboscq@oracle.com> |
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date | Thu, 21 Jul 2011 11:32:22 +0200 |
parents | f95d63e2154a |
children | d1bdeef3e3e2 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2000, 2010, 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). | |
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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 | |
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32 class ReferencePolicy : public CHeapObj { |
0 | 33 public: |
34 virtual bool should_clear_reference(oop p) { ShouldNotReachHere(); return true; } | |
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35 // Capture state (of-the-VM) information needed to evaluate the policy |
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36 virtual void setup() { /* do nothing */ } |
0 | 37 }; |
38 | |
39 class NeverClearPolicy : public ReferencePolicy { | |
40 public: | |
41 bool should_clear_reference(oop p) { return false; } | |
42 }; | |
43 | |
44 class AlwaysClearPolicy : public ReferencePolicy { | |
45 public: | |
46 bool should_clear_reference(oop p) { return true; } | |
47 }; | |
48 | |
49 class LRUCurrentHeapPolicy : public ReferencePolicy { | |
50 private: | |
51 jlong _max_interval; | |
52 | |
53 public: | |
54 LRUCurrentHeapPolicy(); | |
55 | |
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56 // Capture state (of-the-VM) information needed to evaluate the policy |
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57 void setup(); |
0 | 58 bool should_clear_reference(oop p); |
59 }; | |
60 | |
61 class LRUMaxHeapPolicy : public ReferencePolicy { | |
62 private: | |
63 jlong _max_interval; | |
64 | |
65 public: | |
66 LRUMaxHeapPolicy(); | |
67 | |
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68 // Capture state (of-the-VM) information needed to evaluate the policy |
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69 void setup(); |
0 | 70 bool should_clear_reference(oop p); |
71 }; | |
1972 | 72 |
73 #endif // SHARE_VM_MEMORY_REFERENCEPOLICY_HPP |