1 /* 2 * Copyright (c) 2016, 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_G1_G1SATBCARDTABLEMODREFBS_INLINE_HPP 26 #define SHARE_VM_GC_G1_G1SATBCARDTABLEMODREFBS_INLINE_HPP 27 28 #include "gc/shared/accessBarrierSupport.inline.hpp" 29 #include "gc/g1/g1SATBCardTableModRefBS.hpp" 30 #include "oops/oop.inline.hpp" 31 32 template <DecoratorSet decorators, typename T> 33 inline void G1SATBCardTableModRefBS::write_ref_field_pre(T* field) { 34 if (HasDecorator<decorators, ARRAYCOPY_DEST_NOT_INITIALIZED>::value || 35 HasDecorator<decorators, AS_NO_KEEPALIVE>::value) { 36 return; 37 } 38 39 T heap_oop = oopDesc::load_heap_oop(field); 40 if (!oopDesc::is_null(heap_oop)) { 41 enqueue(oopDesc::decode_heap_oop_not_null(heap_oop)); 42 } 43 } 44 45 template <DecoratorSet decorators, typename T> 46 inline void G1SATBCardTableLoggingModRefBS::write_ref_field_post(T* field, oop new_val) { 47 volatile jbyte* byte = byte_for(field); 48 if (*byte != g1_young_gen) { 49 // Take a slow path for cards in old 50 write_ref_field_post_slow(byte); 51 } 52 } 53 54 void G1SATBCardTableModRefBS::set_card_claimed(size_t card_index) { 55 jbyte val = _byte_map[card_index]; 56 if (val == clean_card_val()) { 57 val = (jbyte)claimed_card_val(); 58 } else { 59 val |= (jbyte)claimed_card_val(); 60 } 61 _byte_map[card_index] = val; 62 } 63 64 inline void G1SATBCardTableModRefBS::enqueue_if_weak_or_archive(DecoratorSet decorators, oop value) { 65 assert((decorators & ON_UNKNOWN_OOP_REF) == 0, "Reference strength must be known"); 66 // Archive roots need to be enqueued since they add subgraphs to the 67 // Java heap that were not there at the snapshot when marking started. 68 // Weak and phantom references also need enqueueing for similar reasons. 69 const bool in_archive_root = (decorators & IN_ARCHIVE_ROOT) != 0; 70 const bool on_strong_oop_ref = (decorators & ON_STRONG_OOP_REF) != 0; 71 const bool peek = (decorators & AS_NO_KEEPALIVE) != 0; 72 const bool needs_enqueue = in_archive_root || (!peek && !on_strong_oop_ref); 73 74 if (needs_enqueue && value != NULL) { 75 enqueue(value); 76 } 77 } 78 79 template <DecoratorSet decorators, typename BarrierSetT> 80 template <typename T> 81 inline oop G1SATBCardTableLoggingModRefBS::AccessBarrier<decorators, BarrierSetT>:: 82 oop_load_not_in_heap(T* addr) { 83 oop value = ModRef::oop_load_not_in_heap(addr); 84 enqueue_if_weak_or_archive(decorators, value); 85 return value; 86 } 87 88 template <DecoratorSet decorators, typename BarrierSetT> 89 template <typename T> 90 inline oop G1SATBCardTableLoggingModRefBS::AccessBarrier<decorators, BarrierSetT>:: 91 oop_load_in_heap(T* addr) { 92 oop value = ModRef::oop_load_in_heap(addr); 93 enqueue_if_weak_or_archive(decorators, value); 94 return value; 95 } 96 97 template <DecoratorSet decorators, typename BarrierSetT> 98 inline oop G1SATBCardTableLoggingModRefBS::AccessBarrier<decorators, BarrierSetT>:: 99 oop_load_in_heap_at(oop base, ptrdiff_t offset) { 100 oop value = ModRef::oop_load_in_heap_at(base, offset); 101 enqueue_if_weak_or_archive(AccessBarrierSupport::resolve_possibly_unknown_oop_ref_strength<decorators>(base, offset), value); 102 return value; 103 } 104 105 template <DecoratorSet decorators, typename BarrierSetT> 106 template <typename T> 107 inline void G1SATBCardTableLoggingModRefBS::AccessBarrier<decorators, BarrierSetT>:: 108 oop_store_not_in_heap(T* addr, oop new_value) { 109 if (HasDecorator<decorators, IN_CONCURRENT_ROOT>::value) { 110 // For roots not scanned in a safepoint, we have to apply SATB barriers 111 // even for roots. 112 G1SATBCardTableLoggingModRefBS *bs = barrier_set_cast<G1SATBCardTableLoggingModRefBS>(BarrierSet::barrier_set()); 113 bs->write_ref_field_pre<decorators>(addr); 114 } 115 Raw::oop_store(addr, new_value); 116 } 117 118 #endif // SHARE_VM_GC_G1_G1SATBCARDTABLEMODREFBS_INLINE_HPP