1 /* 2 * Copyright (c) 2016, 2019, 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_GC_G1_G1BARRIERSET_INLINE_HPP 26 #define SHARE_GC_G1_G1BARRIERSET_INLINE_HPP 27 28 #include "gc/g1/g1BarrierSet.hpp" 29 #include "gc/g1/g1CardTable.hpp" 30 #include "gc/shared/accessBarrierSupport.inline.hpp" 31 #include "oops/access.inline.hpp" 32 #include "oops/compressedOops.inline.hpp" 33 #include "oops/oop.hpp" 34 35 template <DecoratorSet decorators, typename T> 36 inline void G1BarrierSet::write_ref_field_pre(T* field) { 37 if (HasDecorator<decorators, IS_DEST_UNINITIALIZED>::value || 38 HasDecorator<decorators, AS_NO_KEEPALIVE>::value) { 39 return; 40 } 41 42 T heap_oop = RawAccess<MO_VOLATILE>::oop_load(field); 43 if (!CompressedOops::is_null(heap_oop)) { 44 enqueue(CompressedOops::decode_not_null(heap_oop)); 45 } 46 } 47 48 template <DecoratorSet decorators, typename T> 49 inline void G1BarrierSet::write_ref_field_post(T* field, oop new_val) { 50 volatile CardValue* byte = _card_table->byte_for(field); 51 if (*byte != G1CardTable::g1_young_card_val()) { 52 // Take a slow path for cards in old 53 write_ref_field_post_slow(byte); 54 } 55 } 56 57 inline void G1BarrierSet::enqueue_if_weak(DecoratorSet decorators, oop value) { 58 assert((decorators & ON_UNKNOWN_OOP_REF) == 0, "Reference strength must be known"); 59 // Loading from a weak or phantom reference needs enqueueing, as 60 // the object may not have been reachable (part of the snapshot) 61 // when marking started. 62 const bool on_strong_oop_ref = (decorators & ON_STRONG_OOP_REF) != 0; 63 const bool peek = (decorators & AS_NO_KEEPALIVE) != 0; 64 const bool needs_enqueue = (!peek && !on_strong_oop_ref); 65 66 if (needs_enqueue && value != NULL) { 67 enqueue(value); 68 } 69 } 70 71 template <DecoratorSet decorators, typename BarrierSetT> 72 template <typename T> 73 inline oop G1BarrierSet::AccessBarrier<decorators, BarrierSetT>:: 74 oop_load_not_in_heap(T* addr) { 75 oop value = ModRef::oop_load_not_in_heap(addr); 76 enqueue_if_weak(decorators, value); 77 return value; 78 } 79 80 template <DecoratorSet decorators, typename BarrierSetT> 81 template <typename T> 82 inline oop G1BarrierSet::AccessBarrier<decorators, BarrierSetT>:: 83 oop_load_in_heap(T* addr) { 84 oop value = ModRef::oop_load_in_heap(addr); 85 enqueue_if_weak(decorators, value); 86 return value; 87 } 88 89 template <DecoratorSet decorators, typename BarrierSetT> 90 inline oop G1BarrierSet::AccessBarrier<decorators, BarrierSetT>:: 91 oop_load_in_heap_at(oop base, ptrdiff_t offset) { 92 oop value = ModRef::oop_load_in_heap_at(base, offset); 93 enqueue_if_weak(AccessBarrierSupport::resolve_possibly_unknown_oop_ref_strength<decorators>(base, offset), value); 94 return value; 95 } 96 97 template <DecoratorSet decorators, typename BarrierSetT> 98 template <typename T> 99 inline void G1BarrierSet::AccessBarrier<decorators, BarrierSetT>:: 100 oop_store_not_in_heap(T* addr, oop new_value) { 101 // Apply SATB barriers for all non-heap references, to allow 102 // concurrent scanning of such references. 103 G1BarrierSet *bs = barrier_set_cast<G1BarrierSet>(BarrierSet::barrier_set()); 104 bs->write_ref_field_pre<decorators>(addr); 105 Raw::oop_store(addr, new_value); 106 } 107 108 #endif // SHARE_GC_G1_G1BARRIERSET_INLINE_HPP