Mercurial > hg > truffle
annotate src/share/vm/memory/referencePolicy.hpp @ 989:148e5441d916
6863023: need non-perm oops in code cache for JSR 292
Summary: Make a special root-list for those few nmethods which might contain non-perm oops.
Reviewed-by: twisti, kvn, never, jmasa, ysr
| author | jrose |
|---|---|
| date | Tue, 15 Sep 2009 21:53:47 -0700 |
| parents | ad8c8ca4ab0f |
| children | c18cbe5936b8 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 470 | 2 * Copyright 2000-2008 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // referencePolicy is used to determine when soft reference objects | |
| 26 // should be cleared. | |
| 27 | |
| 28 | |
|
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6684579: SoftReference processing can be made more efficient
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29 class ReferencePolicy : public CHeapObj { |
| 0 | 30 public: |
| 31 virtual bool should_clear_reference(oop p) { ShouldNotReachHere(); return true; } | |
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6684579: SoftReference processing can be made more efficient
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32 // Capture state (of-the-VM) information needed to evaluate the policy |
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27a80744a83b
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
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33 virtual void setup() { /* do nothing */ } |
| 0 | 34 }; |
| 35 | |
| 36 class NeverClearPolicy : public ReferencePolicy { | |
| 37 public: | |
| 38 bool should_clear_reference(oop p) { return false; } | |
| 39 }; | |
| 40 | |
| 41 class AlwaysClearPolicy : public ReferencePolicy { | |
| 42 public: | |
| 43 bool should_clear_reference(oop p) { return true; } | |
| 44 }; | |
| 45 | |
| 46 class LRUCurrentHeapPolicy : public ReferencePolicy { | |
| 47 private: | |
| 48 jlong _max_interval; | |
| 49 | |
| 50 public: | |
| 51 LRUCurrentHeapPolicy(); | |
| 52 | |
|
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
0
diff
changeset
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53 // Capture state (of-the-VM) information needed to evaluate the policy |
|
457
27a80744a83b
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
453
diff
changeset
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54 void setup(); |
| 0 | 55 bool should_clear_reference(oop p); |
| 56 }; | |
| 57 | |
| 58 class LRUMaxHeapPolicy : public ReferencePolicy { | |
| 59 private: | |
| 60 jlong _max_interval; | |
| 61 | |
| 62 public: | |
| 63 LRUMaxHeapPolicy(); | |
| 64 | |
|
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
0
diff
changeset
|
65 // Capture state (of-the-VM) information needed to evaluate the policy |
|
457
27a80744a83b
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
453
diff
changeset
|
66 void setup(); |
| 0 | 67 bool should_clear_reference(oop p); |
| 68 }; |