Mercurial > hg > graal-compiler
annotate src/share/vm/memory/genRemSet.cpp @ 11001:c52abc8a0b08
8010124: JVM_GetClassContext: use GrowableArray instead of KlassLink
Summary: replace linked data structure with array (performance)
Reviewed-by: kvn
Contributed-by: christian.thalinger@oracle.com, david.r.chase@oracle.com
author | drchase |
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date | Thu, 13 Jun 2013 15:39:47 -0400 |
parents | da91efe96a93 |
children | ab68fc0101ce |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 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 #include "precompiled.hpp" |
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26 #include "classfile/classLoaderData.hpp" |
1972 | 27 #include "memory/cardTableRS.hpp" |
28 #include "memory/genRemSet.hpp" | |
29 | |
0 | 30 // This kind of "BarrierSet" allows a "CollectedHeap" to detect and |
31 // enumerate ref fields that have been modified (since the last | |
32 // enumeration.) | |
33 | |
34 uintx GenRemSet::max_alignment_constraint(Name nm) { | |
35 switch (nm) { | |
36 case GenRemSet::CardTable: | |
37 return CardTableRS::ct_max_alignment_constraint(); | |
38 default: | |
39 guarantee(false, "Unrecognized GenRemSet type."); | |
40 return (0); // Make Windows compiler happy | |
41 } | |
42 } | |
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43 |
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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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69 |
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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 } |