1 /* 2 * Copyright (c) 2015, 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 #ifndef SHARE_GC_Z_ZOOPCLOSURES_INLINE_HPP 25 #define SHARE_GC_Z_ZOOPCLOSURES_INLINE_HPP 26 27 #include "classfile/classLoaderData.hpp" 28 #include "gc/z/zBarrier.inline.hpp" 29 #include "gc/z/zHeap.inline.hpp" 30 #include "gc/z/zOop.inline.hpp" 31 #include "gc/z/zOopClosures.hpp" 32 #include "oops/oop.inline.hpp" 33 #include "runtime/atomic.hpp" 34 #include "utilities/debug.hpp" 35 36 inline void ZLoadBarrierOopClosure::do_oop(oop* p) { 37 ZBarrier::load_barrier_on_oop_field(p); 38 } 39 40 inline void ZLoadBarrierOopClosure::do_oop(narrowOop* p) { 41 ShouldNotReachHere(); 42 } 43 44 inline void ZNMethodOopClosure::do_oop(oop* p) { 45 if (ZResurrection::is_blocked()) { 46 ZBarrier::keep_alive_barrier_on_phantom_root_oop_field(p); 47 } else { 48 ZBarrier::load_barrier_on_root_oop_field(p); 49 } 50 } 51 52 inline void ZNMethodOopClosure::do_oop(narrowOop* p) { 53 ShouldNotReachHere(); 54 } 55 56 template <bool finalizable> 57 inline ZMarkBarrierOopClosure<finalizable>::ZMarkBarrierOopClosure() : 58 ClaimMetadataVisitingOopIterateClosure(finalizable 59 ? ClassLoaderData::_claim_finalizable 60 : ClassLoaderData::_claim_strong, 61 finalizable 62 ? NULL 63 : ZHeap::heap()->reference_discoverer()) {} 64 65 template <bool finalizable> 66 inline void ZMarkBarrierOopClosure<finalizable>::do_oop(oop* p) { 67 ZBarrier::mark_barrier_on_oop_field(p, finalizable); 68 } 69 70 template <bool finalizable> 71 inline void ZMarkBarrierOopClosure<finalizable>::do_oop(narrowOop* p) { 72 ShouldNotReachHere(); 73 } 74 75 inline bool ZPhantomIsAliveObjectClosure::do_object_b(oop o) { 76 return ZBarrier::is_alive_barrier_on_phantom_oop(o); 77 } 78 79 inline void ZPhantomKeepAliveOopClosure::do_oop(oop* p) { 80 ZBarrier::keep_alive_barrier_on_phantom_oop_field(p); 81 } 82 83 inline void ZPhantomKeepAliveOopClosure::do_oop(narrowOop* p) { 84 ShouldNotReachHere(); 85 } 86 87 inline void ZPhantomCleanOopClosure::do_oop(oop* p) { 88 // Read the oop once, to make sure the liveness check 89 // and the later clearing uses the same value. 90 const oop obj = *(volatile oop*)p; 91 if (ZBarrier::is_alive_barrier_on_phantom_oop(obj)) { 92 ZBarrier::keep_alive_barrier_on_phantom_oop_field(p); 93 } else { 94 // The destination could have been modified/reused, in which case 95 // we don't want to clear it. However, no one could write the same 96 // oop here again (the object would be strongly live and we would 97 // not consider clearing such oops), so therefore we don't have an 98 // ABA problem here. 99 Atomic::cmpxchg(oop(NULL), p, obj); 100 } 101 } 102 103 inline void ZPhantomCleanOopClosure::do_oop(narrowOop* p) { 104 ShouldNotReachHere(); 105 } 106 107 #endif // SHARE_GC_Z_ZOOPCLOSURES_INLINE_HPP