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annotate src/share/vm/memory/genRemSet.cpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents f95d63e2154a
children ab68fc0101ce
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1 /*
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2 * Copyright (c) 2001, 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 #include "precompiled.hpp"
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26 #include "classfile/classLoaderData.hpp"
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27 #include "memory/cardTableRS.hpp"
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28 #include "memory/genRemSet.hpp"
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29
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30 // This kind of "BarrierSet" allows a "CollectedHeap" to detect and
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31 // enumerate ref fields that have been modified (since the last
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32 // enumeration.)
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33
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34 uintx GenRemSet::max_alignment_constraint(Name nm) {
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35 switch (nm) {
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36 case GenRemSet::CardTable:
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37 return CardTableRS::ct_max_alignment_constraint();
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38 default:
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39 guarantee(false, "Unrecognized GenRemSet type.");
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40 return (0); // Make Windows compiler happy
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41 }
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42 }
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44 class HasAccumulatedModifiedOopsClosure : public KlassClosure {
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45 bool _found;
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46 public:
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47 HasAccumulatedModifiedOopsClosure() : _found(false) {}
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48 void do_klass(Klass* klass) {
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49 if (_found) {
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50 return;
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51 }
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52
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53 if (klass->has_accumulated_modified_oops()) {
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54 _found = true;
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55 }
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56 }
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57 bool found() {
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58 return _found;
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59 }
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60 };
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61
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62 bool KlassRemSet::mod_union_is_clear() {
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63 HasAccumulatedModifiedOopsClosure closure;
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64 ClassLoaderDataGraph::classes_do(&closure);
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65
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66 return !closure.found();
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67 }
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68
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70 class ClearKlassModUnionClosure : public KlassClosure {
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71 public:
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72 void do_klass(Klass* klass) {
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73 if (klass->has_accumulated_modified_oops()) {
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74 klass->clear_accumulated_modified_oops();
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75 }
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76 }
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77 };
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78
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79 void KlassRemSet::clear_mod_union() {
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80 ClearKlassModUnionClosure closure;
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81 ClassLoaderDataGraph::classes_do(&closure);
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82 }