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1 /*
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2 * Copyright 2002-2006 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
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26 inline void PSScavenge::save_to_space_top_before_gc() {
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27 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
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28 _to_space_top_before_gc = heap->young_gen()->to_space()->top();
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29 }
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30
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31 inline bool PSScavenge::should_scavenge(oop p) {
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32 return p == NULL ? false : PSScavenge::is_obj_in_young((HeapWord*) p);
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33 }
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34
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35 inline bool PSScavenge::should_scavenge(oop p, MutableSpace* to_space) {
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36 if (should_scavenge(p)) {
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37 // Skip objects copied to to_space since the scavenge started.
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38 HeapWord* const addr = (HeapWord*) p;
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39 return addr < to_space_top_before_gc() || addr >= to_space->end();
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40 }
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41 return false;
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42 }
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43
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44 inline bool PSScavenge::should_scavenge(oop p, bool check_to_space) {
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45 if (check_to_space) {
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46 ParallelScavengeHeap* heap = (ParallelScavengeHeap*) Universe::heap();
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47 return should_scavenge(p, heap->young_gen()->to_space());
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48 }
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49 return should_scavenge(p);
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50 }
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51
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52 // Attempt to "claim" oop at p via CAS, push the new obj if successful
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53 // This version tests the oop* to make sure it is within the heap before
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54 // attempting marking.
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55 inline void PSScavenge::copy_and_push_safe_barrier(PSPromotionManager* pm,
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56 oop* p) {
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57 assert(should_scavenge(*p, true), "revisiting object?");
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58
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59 oop o = *p;
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60 if (o->is_forwarded()) {
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61 *p = o->forwardee();
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62 } else {
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63 *p = pm->copy_to_survivor_space(o, pm->depth_first());
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64 }
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65
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66 // We cannot mark without test, as some code passes us pointers
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67 // that are outside the heap.
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68 if ((!PSScavenge::is_obj_in_young((HeapWord*) p)) &&
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69 Universe::heap()->is_in_reserved(p)) {
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70 o = *p;
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71 if (PSScavenge::is_obj_in_young((HeapWord*) o)) {
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72 card_table()->inline_write_ref_field_gc(p, o);
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73 }
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74 }
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75 }
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