1 /* 2 * Copyright (c) 2000, 2021, 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 "classfile/javaClasses.inline.hpp" 33 #include "gc/serial/serialStringDedup.hpp" 34 #include "memory/universe.hpp" 35 #include "oops/markWord.hpp" 36 #include "oops/access.inline.hpp" 37 #include "oops/compressedOops.inline.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "utilities/align.hpp" 40 #include "utilities/stack.inline.hpp" 41 42 inline void MarkSweep::mark_object(oop obj) { 43 if (StringDedup::is_enabled() && 44 java_lang_String::is_instance(obj) && 45 SerialStringDedup::is_candidate_from_mark(obj)) { 46 _string_dedup_requests->add(obj); 47 } 48 49 // some marks may contain information we need to preserve so we store them away 50 // and overwrite the mark. We'll restore it at the end of markSweep. 51 markWord mark = obj->mark(); 52 obj->set_mark(obj->klass()->prototype_header().set_marked()); 53 54 if (obj->mark_must_be_preserved(mark)) { 55 preserve_mark(obj, mark); 56 } 57 } 58 59 template <class T> inline void MarkSweep::mark_and_push(T* p) { 60 T heap_oop = RawAccess<>::oop_load(p); 61 if (!CompressedOops::is_null(heap_oop)) { 62 oop obj = CompressedOops::decode_not_null(heap_oop); 63 if (!obj->mark().is_marked()) { 64 mark_object(obj); 65 _marking_stack.push(obj); 66 } 67 } 68 } 69 70 inline void MarkSweep::follow_klass(Klass* klass) { 71 oop op = klass->class_loader_data()->holder_no_keepalive(); 72 MarkSweep::mark_and_push(&op); 73 } 74 75 inline void MarkSweep::follow_cld(ClassLoaderData* cld) { 76 MarkSweep::follow_cld_closure.do_cld(cld); 77 } 78 79 template <typename T> 80 inline void MarkAndPushClosure::do_oop_work(T* p) { MarkSweep::mark_and_push(p); } 81 inline void MarkAndPushClosure::do_oop(oop* p) { do_oop_work(p); } 82 inline void MarkAndPushClosure::do_oop(narrowOop* p) { do_oop_work(p); } 83 inline void MarkAndPushClosure::do_klass(Klass* k) { MarkSweep::follow_klass(k); } 84 inline void MarkAndPushClosure::do_cld(ClassLoaderData* cld) { MarkSweep::follow_cld(cld); } 85 86 template <class T> inline void MarkSweep::adjust_pointer(const SlidingForwarding* const forwarding, T* p) { 87 T heap_oop = RawAccess<>::oop_load(p); 88 if (!CompressedOops::is_null(heap_oop)) { 89 oop obj = CompressedOops::decode_not_null(heap_oop); 90 assert(Universe::heap()->is_in(obj), "should be in heap"); 91 92 markWord header = obj->mark(); 93 if (header.is_marked()) { 94 oop new_obj = forwarding->forwardee(obj); 95 assert(new_obj != NULL, "must be forwarded"); 96 assert(is_object_aligned(new_obj), "oop must be aligned"); 97 RawAccess<IS_NOT_NULL>::oop_store(p, new_obj); 98 } 99 } 100 } 101 102 template <typename T> 103 void AdjustPointerClosure::do_oop_work(T* p) { MarkSweep::adjust_pointer(_forwarding, p); } 104 inline void AdjustPointerClosure::do_oop(oop* p) { do_oop_work(p); } 105 inline void AdjustPointerClosure::do_oop(narrowOop* p) { do_oop_work(p); } 106 107 108 inline size_t MarkSweep::adjust_pointers(const SlidingForwarding* const forwarding, oop obj) { 109 AdjustPointerClosure cl(forwarding); 110 return obj->oop_iterate_size(&cl); 111 } 112 113 #endif // SHARE_GC_SERIAL_MARKSWEEP_INLINE_HPP