1 /* |
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2 * Copyright (c) 2010, 2019, 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 #ifndef SHARE_GC_CMS_PROMOTIONINFO_INLINE_HPP |
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26 #define SHARE_GC_CMS_PROMOTIONINFO_INLINE_HPP |
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27 |
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28 #include "gc/cms/promotionInfo.hpp" |
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29 #include "oops/oop.inline.hpp" |
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30 #include "utilities/debug.hpp" |
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31 #include "utilities/macros.hpp" |
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32 |
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33 ////////////////////////////////////////////////////////////////////////////// |
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34 // We go over the list of promoted objects, removing each from the list, |
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35 // and applying the closure (this may, in turn, add more elements to |
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36 // the tail of the promoted list, and these newly added objects will |
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37 // also be processed) until the list is empty. |
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38 // To aid verification and debugging, in the non-product builds |
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39 // we actually forward _promoHead each time we process a promoted oop. |
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40 // Note that this is not necessary in general (i.e. when we don't need to |
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41 // call PromotionInfo::verify()) because oop_iterate can only add to the |
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42 // end of _promoTail, and never needs to look at _promoHead. |
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43 |
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44 template <typename OopClosureType> |
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45 void PromotionInfo::promoted_oops_iterate(OopClosureType* cl) { |
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46 NOT_PRODUCT(verify()); |
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47 PromotedObject *curObj, *nextObj; |
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48 for (curObj = _promoHead; curObj != NULL; curObj = nextObj) { |
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49 if ((nextObj = curObj->next()) == NULL) { |
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50 /* protect ourselves against additions due to closure application |
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51 below by resetting the list. */ |
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52 assert(_promoTail == curObj, "Should have been the tail"); |
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53 _promoHead = _promoTail = NULL; |
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54 } |
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55 if (curObj->hasDisplacedMark()) { |
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56 /* restore displaced header */ |
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57 oop(curObj)->set_mark_raw(nextDisplacedHeader()); |
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58 } else { |
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59 /* restore prototypical header */ |
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60 oop(curObj)->init_mark_raw(); |
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61 } |
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62 /* The "promoted_mark" should now not be set */ |
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63 assert(!curObj->hasPromotedMark(), |
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64 "Should have been cleared by restoring displaced mark-word"); |
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65 NOT_PRODUCT(_promoHead = nextObj); |
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66 if (cl != NULL) oop(curObj)->oop_iterate(cl); |
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67 if (nextObj == NULL) { /* start at head of list reset above */ |
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68 nextObj = _promoHead; |
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69 } |
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70 } |
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71 assert(noPromotions(), "post-condition violation"); |
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72 assert(_promoHead == NULL && _promoTail == NULL, "emptied promoted list"); |
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73 assert(_spoolHead == _spoolTail, "emptied spooling buffers"); |
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74 assert(_firstIndex == _nextIndex, "empty buffer"); |
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75 } |
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76 |
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77 #endif // SHARE_GC_CMS_PROMOTIONINFO_INLINE_HPP |
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