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annotate src/share/vm/oops/objArrayKlass.inline.hpp @ 1311:2a1472c30599

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4396719: Mark Sweep stack overflow on deeply nested Object arrays Summary: Use an explicit stack for object arrays and process them in chunks. Reviewed-by: iveresov, apetrusenko
author jcoomes
date Wed, 03 Mar 2010 14:48:26 -0800
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children c18cbe5936b8
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1311
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1 /*
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2 * Copyright 2010 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 void objArrayKlass::oop_follow_contents(oop obj, int index) {
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26 if (UseCompressedOops) {
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27 objarray_follow_contents<narrowOop>(obj, index);
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28 } else {
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29 objarray_follow_contents<oop>(obj, index);
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30 }
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31 }
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32
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33 template <class T>
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34 void objArrayKlass::objarray_follow_contents(oop obj, int index) {
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35 objArrayOop a = objArrayOop(obj);
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36 const size_t len = size_t(a->length());
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37 const size_t beg_index = size_t(index);
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38 assert(beg_index < len || len == 0, "index too large");
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39
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40 const size_t stride = MIN2(len - beg_index, ObjArrayMarkingStride);
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41 const size_t end_index = beg_index + stride;
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42 T* const base = (T*)a->base();
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43 T* const beg = base + beg_index;
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44 T* const end = base + end_index;
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45
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46 // Push the non-NULL elements of the next stride on the marking stack.
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47 for (T* e = beg; e < end; e++) {
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48 MarkSweep::mark_and_push<T>(e);
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49 }
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50
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51 if (end_index < len) {
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52 MarkSweep::push_objarray(a, end_index); // Push the continuation.
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53 }
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54 }
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55
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56 #ifndef SERIALGC
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57 void objArrayKlass::oop_follow_contents(ParCompactionManager* cm, oop obj,
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58 int index) {
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59 if (UseCompressedOops) {
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60 objarray_follow_contents<narrowOop>(cm, obj, index);
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61 } else {
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62 objarray_follow_contents<oop>(cm, obj, index);
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63 }
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64 }
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65
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66 template <class T>
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67 void objArrayKlass::objarray_follow_contents(ParCompactionManager* cm, oop obj,
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68 int index) {
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69 objArrayOop a = objArrayOop(obj);
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70 const size_t len = size_t(a->length());
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71 const size_t beg_index = size_t(index);
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72 assert(beg_index < len || len == 0, "index too large");
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73
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74 const size_t stride = MIN2(len - beg_index, ObjArrayMarkingStride);
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75 const size_t end_index = beg_index + stride;
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76 T* const base = (T*)a->base();
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77 T* const beg = base + beg_index;
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78 T* const end = base + end_index;
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79
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80 // Push the non-NULL elements of the next stride on the marking stack.
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81 for (T* e = beg; e < end; e++) {
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82 PSParallelCompact::mark_and_push<T>(cm, e);
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83 }
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84
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85 if (end_index < len) {
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86 cm->push_objarray(a, end_index); // Push the continuation.
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87 }
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88 }
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89 #endif // #ifndef SERIALGC