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annotate src/share/vm/classfile/metadataOnStackMark.cpp @ 21810:0366a71eda74

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8047125: (ref) More phantom object references Reviewed-by: mchung, dfuchs, ahgross, jmasa, brutisso, mgerdin Contributed-by: kim.barrett@oracle.com
author jmasa
date Fri, 26 Sep 2014 17:48:10 -0400
parents 0b9ea9a72436
children 2c6ef90f030a
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1 /*
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2 * Copyright (c) 2013, 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/metadataOnStackMark.hpp"
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27 #include "code/codeCache.hpp"
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28 #include "compiler/compileBroker.hpp"
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29 #include "oops/metadata.hpp"
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30 #include "prims/jvmtiImpl.hpp"
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31 #include "runtime/synchronizer.hpp"
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32 #include "runtime/thread.hpp"
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33 #include "services/threadService.hpp"
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34 #include "utilities/growableArray.hpp"
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35
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36
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37 // Keep track of marked on-stack metadata so it can be cleared.
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38 GrowableArray<Metadata*>* _marked_objects = NULL;
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39 NOT_PRODUCT(bool MetadataOnStackMark::_is_active = false;)
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40
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41 // Walk metadata on the stack and mark it so that redefinition doesn't delete
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42 // it. Class unloading also walks the previous versions and might try to
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43 // delete it, so this class is used by class unloading also.
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44 MetadataOnStackMark::MetadataOnStackMark() {
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45 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
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46 NOT_PRODUCT(_is_active = true;)
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47 if (_marked_objects == NULL) {
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48 _marked_objects = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(1000, true);
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49 }
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50 Threads::metadata_do(Metadata::mark_on_stack);
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51 CodeCache::alive_nmethods_do(nmethod::mark_on_stack);
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52 CompileBroker::mark_on_stack();
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53 JvmtiCurrentBreakpoints::metadata_do(Metadata::mark_on_stack);
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54 ThreadService::metadata_do(Metadata::mark_on_stack);
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55 }
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56
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57 MetadataOnStackMark::~MetadataOnStackMark() {
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58 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
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59 // Unmark everything that was marked. Can't do the same walk because
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60 // redefine classes messes up the code cache so the set of methods
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61 // might not be the same.
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62 for (int i = 0; i< _marked_objects->length(); i++) {
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63 _marked_objects->at(i)->set_on_stack(false);
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64 }
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65 _marked_objects->clear(); // reuse growable array for next time.
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66 NOT_PRODUCT(_is_active = false;)
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67 }
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68
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69 // Record which objects are marked so we can unmark the same objects.
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70 void MetadataOnStackMark::record(Metadata* m) {
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71 assert(_is_active, "metadata on stack marking is active");
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72 _marked_objects->push(m);
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73 }