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annotate src/share/vm/gc_implementation/parallelScavenge/psScavenge.inline.hpp @ 2426:1d1603768966

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7010070: Update all 2010 Oracle-changed OpenJDK files to have the proper copyright dates - second pass Summary: Update the copyright to be 2010 on all changed files in OpenJDK Reviewed-by: ohair
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date Tue, 05 Apr 2011 14:12:31 -0700
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1 /*
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2 * Copyright (c) 2002, 2011, 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_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP
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27
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28 #include "gc_implementation/parallelScavenge/cardTableExtension.hpp"
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29 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
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30 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp"
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31 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
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32
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33 inline void PSScavenge::save_to_space_top_before_gc() {
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34 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
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35 _to_space_top_before_gc = heap->young_gen()->to_space()->top();
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36 }
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37
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38 template <class T> inline bool PSScavenge::should_scavenge(T* p) {
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39 T heap_oop = oopDesc::load_heap_oop(p);
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40 if (oopDesc::is_null(heap_oop)) return false;
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41 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
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42 return PSScavenge::is_obj_in_young((HeapWord*)obj);
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43 }
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44
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45 template <class T>
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46 inline bool PSScavenge::should_scavenge(T* p, MutableSpace* to_space) {
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47 if (should_scavenge(p)) {
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48 oop obj = oopDesc::load_decode_heap_oop_not_null(p);
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49 // Skip objects copied to to_space since the scavenge started.
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50 HeapWord* const addr = (HeapWord*)obj;
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51 return addr < to_space_top_before_gc() || addr >= to_space->end();
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52 }
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53 return false;
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54 }
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55
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56 template <class T>
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57 inline bool PSScavenge::should_scavenge(T* p, bool check_to_space) {
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58 if (check_to_space) {
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59 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
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60 return should_scavenge(p, heap->young_gen()->to_space());
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61 }
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62 return should_scavenge(p);
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63 }
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64
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65 // Attempt to "claim" oop at p via CAS, push the new obj if successful
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66 // This version tests the oop* to make sure it is within the heap before
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67 // attempting marking.
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68 template <class T>
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69 inline void PSScavenge::copy_and_push_safe_barrier(PSPromotionManager* pm,
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70 T* p) {
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71 assert(should_scavenge(p, true), "revisiting object?");
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72
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73 oop o = oopDesc::load_decode_heap_oop_not_null(p);
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74 oop new_obj = o->is_forwarded()
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75 ? o->forwardee()
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76 : pm->copy_to_survivor_space(o);
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77 oopDesc::encode_store_heap_oop_not_null(p, new_obj);
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78
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79 // We cannot mark without test, as some code passes us pointers
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80 // that are outside the heap.
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81 if ((!PSScavenge::is_obj_in_young((HeapWord*)p)) &&
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82 Universe::heap()->is_in_reserved(p)) {
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83 if (PSScavenge::is_obj_in_young((HeapWord*)new_obj)) {
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84 card_table()->inline_write_ref_field_gc(p, new_obj);
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85 }
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86 }
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87 }
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88
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89 class PSScavengeRootsClosure: public OopClosure {
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90 private:
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91 PSPromotionManager* _promotion_manager;
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92
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93 protected:
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94 template <class T> void do_oop_work(T *p) {
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95 if (PSScavenge::should_scavenge(p)) {
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96 // We never card mark roots, maybe call a func without test?
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97 PSScavenge::copy_and_push_safe_barrier(_promotion_manager, p);
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98 }
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99 }
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100 public:
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101 PSScavengeRootsClosure(PSPromotionManager* pm) : _promotion_manager(pm) { }
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102 void do_oop(oop* p) { PSScavengeRootsClosure::do_oop_work(p); }
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103 void do_oop(narrowOop* p) { PSScavengeRootsClosure::do_oop_work(p); }
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104 };
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105
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106 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP