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1 /*
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2 * Copyright 2000-2006 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 inline void MarkSweep::_adjust_pointer(oop* p, bool isroot) {
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26 oop obj = *p;
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27 VALIDATE_MARK_SWEEP_ONLY(oop saved_new_pointer = NULL);
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28 if (obj != NULL) {
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29 oop new_pointer = oop(obj->mark()->decode_pointer());
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30 assert(new_pointer != NULL || // is forwarding ptr?
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31 obj->mark() == markOopDesc::prototype() || // not gc marked?
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32 (UseBiasedLocking && obj->mark()->has_bias_pattern()) || // not gc marked?
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33 obj->is_shared(), // never forwarded?
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34 "should contain a forwarding pointer");
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35 if (new_pointer != NULL) {
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36 *p = new_pointer;
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37 assert(Universe::heap()->is_in_reserved(new_pointer),
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38 "should be in object space");
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39 VALIDATE_MARK_SWEEP_ONLY(saved_new_pointer = new_pointer);
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40 }
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41 }
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42 VALIDATE_MARK_SWEEP_ONLY(track_adjusted_pointer(p, saved_new_pointer, isroot));
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43 }
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44
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45 inline void MarkSweep::mark_object(oop obj) {
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46
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47 #ifndef SERIALGC
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48 if (UseParallelOldGC && VerifyParallelOldWithMarkSweep) {
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49 assert(PSParallelCompact::mark_bitmap()->is_marked(obj),
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50 "Should be marked in the marking bitmap");
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51 }
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52 #endif // SERIALGC
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53
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54 // some marks may contain information we need to preserve so we store them away
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55 // and overwrite the mark. We'll restore it at the end of markSweep.
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56 markOop mark = obj->mark();
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57 obj->set_mark(markOopDesc::prototype()->set_marked());
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58
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59 if (mark->must_be_preserved(obj)) {
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60 preserve_mark(obj, mark);
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61 }
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62 }
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