1 /* 2 * Copyright (c) 2001, 2017, 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_GC_SHARED_GENOOPCLOSURES_INLINE_HPP 26 #define SHARE_VM_GC_SHARED_GENOOPCLOSURES_INLINE_HPP 27 28 #include "gc/serial/defNewGeneration.hpp" 29 #include "gc/shared/cardTableRS.hpp" 30 #include "gc/shared/genCollectedHeap.hpp" 31 #include "gc/shared/genOopClosures.hpp" 32 #include "gc/shared/generation.hpp" 33 #include "gc/shared/space.hpp" 34 #include "oops/access.inline.hpp" 35 #include "oops/compressedOops.inline.hpp" 36 37 inline OopsInGenClosure::OopsInGenClosure(Generation* gen) : 38 ExtendedOopClosure(gen->ref_processor()), _orig_gen(gen), _rs(NULL) { 39 set_generation(gen); 40 } 41 42 inline void OopsInGenClosure::set_generation(Generation* gen) { 43 _gen = gen; 44 _gen_boundary = _gen->reserved().start(); 45 // Barrier set for the heap, must be set after heap is initialized 46 if (_rs == NULL) { 47 _rs = GenCollectedHeap::heap()->rem_set(); 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 = RawAccess<>::oop_load(p); 54 assert(!CompressedOops::is_null(heap_oop), "expected non-null oop"); 55 oop obj = CompressedOops::decode_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 = RawAccess<>::oop_load(p); 65 assert(!CompressedOops::is_null(heap_oop), "expected non-null oop"); 66 oop obj = CompressedOops::decode_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 OopsInClassLoaderDataOrGenClosure::do_cld_barrier() { 74 assert(_scanned_cld != NULL, "Must be"); 75 if (!_scanned_cld->has_modified_oops()) { 76 _scanned_cld->record_modified_oops(); 77 } 78 } 79 80 // NOTE! Any changes made here should also be made 81 // in FastScanClosure::do_oop_work() 82 template <class T> inline void ScanClosure::do_oop_work(T* p) { 83 T heap_oop = RawAccess<>::oop_load(p); 84 // Should we copy the obj? 85 if (!CompressedOops::is_null(heap_oop)) { 86 oop obj = CompressedOops::decode_not_null(heap_oop); 87 if ((HeapWord*)obj < _boundary) { 88 assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?"); 89 oop new_obj = obj->is_forwarded() ? obj->forwardee() 90 : _g->copy_to_survivor_space(obj); 91 RawAccess<OOP_NOT_NULL>::oop_store(p, new_obj); 92 } 93 94 if (is_scanning_a_cld()) { 95 do_cld_barrier(); 96 } else if (_gc_barrier) { 97 // Now call parent closure 98 do_barrier(p); 99 } 100 } 101 } 102 103 inline void ScanClosure::do_oop_nv(oop* p) { ScanClosure::do_oop_work(p); } 104 inline void ScanClosure::do_oop_nv(narrowOop* p) { ScanClosure::do_oop_work(p); } 105 106 // NOTE! Any changes made here should also be made 107 // in ScanClosure::do_oop_work() 108 template <class T> inline void FastScanClosure::do_oop_work(T* p) { 109 T heap_oop = RawAccess<>::oop_load(p); 110 // Should we copy the obj? 111 if (!CompressedOops::is_null(heap_oop)) { 112 oop obj = CompressedOops::decode_not_null(heap_oop); 113 if ((HeapWord*)obj < _boundary) { 114 assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?"); 115 oop new_obj = obj->is_forwarded() ? obj->forwardee() 116 : _g->copy_to_survivor_space(obj); 117 RawAccess<OOP_NOT_NULL>::oop_store(p, new_obj); 118 if (is_scanning_a_cld()) { 119 do_cld_barrier(); 120 } else if (_gc_barrier) { 121 // Now call parent closure 122 do_barrier(p); 123 } 124 } 125 } 126 } 127 128 inline void FastScanClosure::do_oop_nv(oop* p) { FastScanClosure::do_oop_work(p); } 129 inline void FastScanClosure::do_oop_nv(narrowOop* p) { FastScanClosure::do_oop_work(p); } 130 131 template <class T> void FilteringClosure::do_oop_work(T* p) { 132 T heap_oop = RawAccess<>::oop_load(p); 133 if (!CompressedOops::is_null(heap_oop)) { 134 oop obj = CompressedOops::decode_not_null(heap_oop); 135 if ((HeapWord*)obj < _boundary) { 136 _cl->do_oop(p); 137 } 138 } 139 } 140 141 void FilteringClosure::do_oop_nv(oop* p) { FilteringClosure::do_oop_work(p); } 142 void FilteringClosure::do_oop_nv(narrowOop* p) { FilteringClosure::do_oop_work(p); } 143 144 // Note similarity to ScanClosure; the difference is that 145 // the barrier set is taken care of outside this closure. 146 template <class T> inline void ScanWeakRefClosure::do_oop_work(T* p) { 147 oop obj = RawAccess<OOP_NOT_NULL>::oop_load(p); 148 // weak references are sometimes scanned twice; must check 149 // that to-space doesn't already contain this object 150 if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) { 151 oop new_obj = obj->is_forwarded() ? obj->forwardee() 152 : _g->copy_to_survivor_space(obj); 153 RawAccess<OOP_NOT_NULL>::oop_store(p, new_obj); 154 } 155 } 156 157 inline void ScanWeakRefClosure::do_oop_nv(oop* p) { ScanWeakRefClosure::do_oop_work(p); } 158 inline void ScanWeakRefClosure::do_oop_nv(narrowOop* p) { ScanWeakRefClosure::do_oop_work(p); } 159 160 #endif // SHARE_VM_GC_SHARED_GENOOPCLOSURES_INLINE_HPP