Mercurial > hg > truffle
annotate src/share/vm/classfile/metadataOnStackMark.cpp @ 17541:4aa6fa2864af
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author | asaha |
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date | Thu, 23 Jan 2014 14:50:08 -0800 |
parents | 0b9ea9a72436 |
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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 } |