1 /* 2 * Copyright (c) 2015, 2018, 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 "gc/z/zBarrier.inline.hpp" 28 #include "gc/z/zHeap.inline.hpp" 29 #include "gc/z/zOop.inline.hpp" 30 #include "gc/z/zOopClosures.hpp" 31 #include "oops/oop.inline.hpp" 32 #include "runtime/atomic.hpp" 33 #include "utilities/debug.hpp" 34 35 inline void ZLoadBarrierOopClosure::do_oop_nv(oop* p) { 36 ZBarrier::load_barrier_on_oop_field(p); 37 } 38 39 inline void ZLoadBarrierOopClosure::do_oop_nv(narrowOop* p) { 40 ShouldNotReachHere(); 41 } 42 43 inline void ZLoadBarrierOopClosure::do_oop(oop* p) { 44 do_oop_nv(p); 45 } 46 47 inline void ZLoadBarrierOopClosure::do_oop(narrowOop* p) { 48 do_oop_nv(p); 49 } 50 51 inline void ZMarkRootOopClosure::do_oop(oop* p) { 52 ZBarrier::mark_barrier_on_root_oop_field(p); 53 } 54 55 inline void ZMarkRootOopClosure::do_oop(narrowOop* p) { 56 ShouldNotReachHere(); 57 } 58 59 inline void ZRelocateRootOopClosure::do_oop(oop* p) { 60 ZBarrier::relocate_barrier_on_root_oop_field(p); 61 } 62 63 inline void ZRelocateRootOopClosure::do_oop(narrowOop* p) { 64 ShouldNotReachHere(); 65 } 66 67 template <bool finalizable> 68 inline ZMarkBarrierOopClosure<finalizable>::ZMarkBarrierOopClosure() : 69 ExtendedOopClosure(finalizable ? NULL : ZHeap::heap()->reference_discoverer()) {} 70 71 template <bool finalizable> 72 inline void ZMarkBarrierOopClosure<finalizable>::do_oop_nv(oop* p) { 73 ZBarrier::mark_barrier_on_oop_field(p, finalizable); 74 } 75 76 template <bool finalizable> 77 inline void ZMarkBarrierOopClosure<finalizable>::do_oop_nv(narrowOop* p) { 78 ShouldNotReachHere(); 79 } 80 81 template <bool finalizable> 82 inline void ZMarkBarrierOopClosure<finalizable>::do_oop(oop* p) { 83 do_oop_nv(p); 84 } 85 86 template <bool finalizable> 87 inline void ZMarkBarrierOopClosure<finalizable>::do_oop(narrowOop* p) { 88 do_oop_nv(p); 89 } 90 91 inline bool ZPhantomIsAliveObjectClosure::do_object_b(oop o) { 92 return ZBarrier::is_alive_barrier_on_phantom_oop(o); 93 } 94 95 inline void ZPhantomKeepAliveOopClosure::do_oop(oop* p) { 96 ZBarrier::keep_alive_barrier_on_phantom_oop_field(p); 97 } 98 99 inline void ZPhantomKeepAliveOopClosure::do_oop(narrowOop* p) { 100 ShouldNotReachHere(); 101 } 102 103 inline void ZPhantomCleanOopClosure::do_oop(oop* p) { 104 // Read the oop once, to make sure the liveness check 105 // and the later clearing uses the same value. 106 const oop obj = *(volatile oop*)p; 107 if (ZBarrier::is_alive_barrier_on_phantom_oop(obj)) { 108 ZBarrier::keep_alive_barrier_on_phantom_oop_field(p); 109 } else { 110 // The destination could have been modified/reused, in which case 111 // we don't want to clear it. However, no one could write the same 112 // oop here again (the object would be strongly live and we would 113 // not consider clearing such oops), so therefore we don't have an 114 // ABA problem here. 115 Atomic::cmpxchg(oop(NULL), p, obj); 116 } 117 } 118 119 inline void ZPhantomCleanOopClosure::do_oop(narrowOop* p) { 120 ShouldNotReachHere(); 121 } 122 123 #endif // SHARE_GC_Z_ZOOPCLOSURES_INLINE_HPP