1 /* 2 * Copyright (c) 2000, 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_SERIAL_MARKSWEEP_INLINE_HPP 26 #define SHARE_GC_SERIAL_MARKSWEEP_INLINE_HPP 27 28 #include "gc/serial/markSweep.hpp" 29 30 #include "gc/shared/slidingForwarding.inline.hpp" 31 #include "classfile/classLoaderData.inline.hpp" 32 #include "memory/universe.hpp" 33 #include "oops/markWord.inline.hpp" 34 #include "oops/access.inline.hpp" 35 #include "oops/compressedOops.inline.hpp" 36 #include "oops/oop.inline.hpp" 37 #include "utilities/align.hpp" 38 #include "utilities/stack.inline.hpp" 39 40 inline void MarkSweep::mark_object(oop obj) { 41 // some marks may contain information we need to preserve so we store them away 42 // and overwrite the mark. We'll restore it at the end of markSweep. 43 markWord mark = obj->mark(); 44 #ifdef _LP64 45 if (UseCompactObjectHeaders) { 46 markWord real_mark = mark; 47 if (real_mark.has_displaced_mark_helper()) { 48 real_mark = real_mark.displaced_mark_helper(); 49 } 50 Klass* klass = real_mark.klass(); 51 obj->set_mark(klass->prototype_header().set_marked()); 52 } else 53 #endif 54 { 55 obj->set_mark(markWord::prototype().set_marked()); 56 } 57 58 if (obj->mark_must_be_preserved(mark)) { 59 preserve_mark(obj, mark); 60 } 61 } 62 63 template <class T> inline void MarkSweep::mark_and_push(T* p) { 64 T heap_oop = RawAccess<>::oop_load(p); 65 if (!CompressedOops::is_null(heap_oop)) { 66 oop obj = CompressedOops::decode_not_null(heap_oop); 67 if (!obj->mark().is_marked()) { 68 mark_object(obj); 69 _marking_stack.push(obj); 70 } 71 } 72 } 73 74 inline void MarkSweep::follow_klass(Klass* klass) { 75 oop op = klass->class_loader_data()->holder_no_keepalive(); 76 MarkSweep::mark_and_push(&op); 77 } 78 79 inline void MarkSweep::follow_cld(ClassLoaderData* cld) { 80 MarkSweep::follow_cld_closure.do_cld(cld); 81 } 82 83 template <typename T> 84 inline void MarkAndPushClosure::do_oop_work(T* p) { MarkSweep::mark_and_push(p); } 85 inline void MarkAndPushClosure::do_oop(oop* p) { do_oop_work(p); } 86 inline void MarkAndPushClosure::do_oop(narrowOop* p) { do_oop_work(p); } 87 inline void MarkAndPushClosure::do_klass(Klass* k) { MarkSweep::follow_klass(k); } 88 inline void MarkAndPushClosure::do_cld(ClassLoaderData* cld) { MarkSweep::follow_cld(cld); } 89 90 template <class T> inline void MarkSweep::adjust_pointer(const SlidingForwarding* const forwarding, T* p) { 91 T heap_oop = RawAccess<>::oop_load(p); 92 if (!CompressedOops::is_null(heap_oop)) { 93 oop obj = CompressedOops::decode_not_null(heap_oop); 94 assert(Universe::heap()->is_in(obj), "should be in heap"); 95 96 markWord header = obj->mark(); 97 if (header.is_marked()) { 98 oop new_obj = forwarding->forwardee(obj); 99 assert(new_obj != NULL, "must be forwarded"); 100 assert(is_object_aligned(new_obj), "oop must be aligned"); 101 RawAccess<IS_NOT_NULL>::oop_store(p, new_obj); 102 } 103 } 104 } 105 106 template <typename T> 107 void AdjustPointerClosure::do_oop_work(T* p) { MarkSweep::adjust_pointer(_forwarding, p); } 108 inline void AdjustPointerClosure::do_oop(oop* p) { do_oop_work(p); } 109 inline void AdjustPointerClosure::do_oop(narrowOop* p) { do_oop_work(p); } 110 111 112 inline int MarkSweep::adjust_pointers(const SlidingForwarding* const forwarding, oop obj) { 113 AdjustPointerClosure cl(forwarding); 114 return obj->oop_iterate_size(&cl); 115 } 116 117 #endif // SHARE_GC_SERIAL_MARKSWEEP_INLINE_HPP