1 /* 2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_MEMORY_GENOOPCLOSURES_INLINE_HPP 26 #define SHARE_VM_MEMORY_GENOOPCLOSURES_INLINE_HPP 27 28 #include "memory/cardTableRS.hpp" 29 #include "memory/defNewGeneration.hpp" 30 #include "memory/genCollectedHeap.hpp" 31 #include "memory/genOopClosures.hpp" 32 #include "memory/genRemSet.hpp" 33 #include "memory/generation.hpp" 34 #include "memory/space.hpp" 35 36 inline OopsInGenClosure::OopsInGenClosure(Generation* gen) : 37 ExtendedOopClosure(gen->ref_processor()), _orig_gen(gen), _rs(NULL) { 38 set_generation(gen); 39 } 40 41 inline void OopsInGenClosure::set_generation(Generation* gen) { 42 _gen = gen; 43 _gen_boundary = _gen->reserved().start(); 44 // Barrier set for the heap, must be set after heap is initialized 45 if (_rs == NULL) { 46 GenRemSet* rs = GenCollectedHeap::heap()->rem_set(); 47 _rs = (CardTableRS*)rs; 48 } 49 } 50 51 template <class T> inline void OopsInGenClosure::do_barrier(T* p) { 52 assert(generation()->is_in_reserved(p), "expected ref in generation"); 53 T heap_oop = oopDesc::load_heap_oop(p); 54 assert(!oopDesc::is_null(heap_oop), "expected non-null oop"); 55 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); 56 // If p points to a younger generation, mark the card. 57 if ((HeapWord*)obj < _gen_boundary) { 58 _rs->inline_write_ref_field_gc(p, obj); 59 } 60 } 61 62 template <class T> inline void OopsInGenClosure::par_do_barrier(T* p) { 63 assert(generation()->is_in_reserved(p), "expected ref in generation"); 64 T heap_oop = oopDesc::load_heap_oop(p); 65 assert(!oopDesc::is_null(heap_oop), "expected non-null oop"); 66 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); 67 // If p points to a younger generation, mark the card. 68 if ((HeapWord*)obj < gen_boundary()) { 69 rs()->write_ref_field_gc_par(p, obj); 70 } 71 } 72 73 inline void OopsInKlassOrGenClosure::do_klass_barrier() { 74 assert(_scanned_klass != NULL, "Must be"); 75 _scanned_klass->record_modified_oops(); 76 } 77 78 // NOTE! Any changes made here should also be made 79 // in FastScanClosure::do_oop_work() 80 template <class T> inline void ScanClosure::do_oop_work(T* p) { 81 T heap_oop = oopDesc::load_heap_oop(p); 82 // Should we copy the obj? 83 if (!oopDesc::is_null(heap_oop)) { 84 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); 85 if ((HeapWord*)obj < _boundary) { 86 assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?"); 87 oop new_obj = obj->is_forwarded() ? obj->forwardee() 88 : _g->copy_to_survivor_space(obj); 89 oopDesc::encode_store_heap_oop_not_null(p, new_obj); 90 } 91 92 if (is_scanning_a_klass()) { 93 do_klass_barrier(); 94 } else if (_gc_barrier) { 95 // Now call parent closure 96 do_barrier(p); 97 } 98 } 99 } 100 101 inline void ScanClosure::do_oop_nv(oop* p) { ScanClosure::do_oop_work(p); } 102 inline void ScanClosure::do_oop_nv(narrowOop* p) { ScanClosure::do_oop_work(p); } 103 104 // NOTE! Any changes made here should also be made 105 // in ScanClosure::do_oop_work() 106 template <class T> inline void FastScanClosure::do_oop_work(T* p) { 107 T heap_oop = oopDesc::load_heap_oop(p); 108 // Should we copy the obj? 109 if (!oopDesc::is_null(heap_oop)) { 110 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); 111 if ((HeapWord*)obj < _boundary) { 112 assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?"); 113 oop new_obj = obj->is_forwarded() ? obj->forwardee() 114 : _g->copy_to_survivor_space(obj); 115 oopDesc::encode_store_heap_oop_not_null(p, new_obj); 116 if (is_scanning_a_klass()) { 117 do_klass_barrier(); 118 } else if (_gc_barrier) { 119 // Now call parent closure 120 do_barrier(p); 121 } 122 } 123 } 124 } 125 126 inline void FastScanClosure::do_oop_nv(oop* p) { FastScanClosure::do_oop_work(p); } 127 inline void FastScanClosure::do_oop_nv(narrowOop* p) { FastScanClosure::do_oop_work(p); } 128 129 // Note similarity to ScanClosure; the difference is that 130 // the barrier set is taken care of outside this closure. 131 template <class T> inline void ScanWeakRefClosure::do_oop_work(T* p) { 132 assert(!oopDesc::is_null(*p), "null weak reference?"); 133 oop obj = oopDesc::load_decode_heap_oop_not_null(p); 134 // weak references are sometimes scanned twice; must check 135 // that to-space doesn't already contain this object 136 if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) { 137 oop new_obj = obj->is_forwarded() ? obj->forwardee() 138 : _g->copy_to_survivor_space(obj); 139 oopDesc::encode_store_heap_oop_not_null(p, new_obj); 140 } 141 } 142 143 inline void ScanWeakRefClosure::do_oop_nv(oop* p) { ScanWeakRefClosure::do_oop_work(p); } 144 inline void ScanWeakRefClosure::do_oop_nv(narrowOop* p) { ScanWeakRefClosure::do_oop_work(p); } 145 146 #endif // SHARE_VM_MEMORY_GENOOPCLOSURES_INLINE_HPP