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comparison 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
comparison
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6724:36d1d483d5d6 6725:da91efe96a93
1 /* 1 /*
2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 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 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
21 * questions. 21 * questions.
22 * 22 *
23 */ 23 */
24 24
25 #include "precompiled.hpp" 25 #include "precompiled.hpp"
26 #include "classfile/classLoaderData.hpp"
26 #include "memory/cardTableRS.hpp" 27 #include "memory/cardTableRS.hpp"
27 #include "memory/genRemSet.hpp" 28 #include "memory/genRemSet.hpp"
28 29
29 // This kind of "BarrierSet" allows a "CollectedHeap" to detect and 30 // This kind of "BarrierSet" allows a "CollectedHeap" to detect and
30 // enumerate ref fields that have been modified (since the last 31 // enumerate ref fields that have been modified (since the last
37 default: 38 default:
38 guarantee(false, "Unrecognized GenRemSet type."); 39 guarantee(false, "Unrecognized GenRemSet type.");
39 return (0); // Make Windows compiler happy 40 return (0); // Make Windows compiler happy
40 } 41 }
41 } 42 }
43
44 class HasAccumulatedModifiedOopsClosure : public KlassClosure {
45 bool _found;
46 public:
47 HasAccumulatedModifiedOopsClosure() : _found(false) {}
48 void do_klass(Klass* klass) {
49 if (_found) {
50 return;
51 }
52
53 if (klass->has_accumulated_modified_oops()) {
54 _found = true;
55 }
56 }
57 bool found() {
58 return _found;
59 }
60 };
61
62 bool KlassRemSet::mod_union_is_clear() {
63 HasAccumulatedModifiedOopsClosure closure;
64 ClassLoaderDataGraph::classes_do(&closure);
65
66 return !closure.found();
67 }
68
69
70 class ClearKlassModUnionClosure : public KlassClosure {
71 public:
72 void do_klass(Klass* klass) {
73 if (klass->has_accumulated_modified_oops()) {
74 klass->clear_accumulated_modified_oops();
75 }
76 }
77 };
78
79 void KlassRemSet::clear_mod_union() {
80 ClearKlassModUnionClosure closure;
81 ClassLoaderDataGraph::classes_do(&closure);
82 }