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 "classfile/classLoaderData.inline.hpp" 29 #include "gc/serial/markSweep.hpp" 30 #include "memory/universe.hpp" 31 #include "oops/markWord.inline.hpp" 32 #include "oops/access.inline.hpp" 33 #include "oops/compressedOops.inline.hpp" 34 #include "oops/oop.inline.hpp" 35 #include "utilities/stack.inline.hpp" 36 37 inline void MarkSweep::mark_object(oop obj) { 38 // some marks may contain information we need to preserve so we store them away 39 // and overwrite the mark. We'll restore it at the end of markSweep. 40 markWord mark = obj->mark_raw(); 41 obj->set_mark_raw(markWord::prototype().set_marked()); 42 43 if (obj->mark_must_be_preserved(mark)) { 44 preserve_mark(obj, mark); 45 } 46 } 47 48 template <class T> inline void MarkSweep::mark_and_push(T* p) { 49 T heap_oop = RawAccess<>::oop_load(p); 50 if (!CompressedOops::is_null(heap_oop)) { 51 oop obj = CompressedOops::decode_not_null(heap_oop); 52 if (!obj->mark_raw().is_marked()) { 53 mark_object(obj); 54 _marking_stack.push(obj); 55 } 56 } 57 } 58 59 inline void MarkSweep::follow_klass(Klass* klass) { 60 oop op = klass->class_loader_data()->holder_no_keepalive(); 61 MarkSweep::mark_and_push(&op); 62 } 63 64 inline void MarkSweep::follow_cld(ClassLoaderData* cld) { 65 MarkSweep::follow_cld_closure.do_cld(cld); 66 } 67 68 template <typename T> 69 inline void MarkAndPushClosure::do_oop_work(T* p) { MarkSweep::mark_and_push(p); } 70 inline void MarkAndPushClosure::do_oop(oop* p) { do_oop_work(p); } 71 inline void MarkAndPushClosure::do_oop(narrowOop* p) { do_oop_work(p); } 72 inline void MarkAndPushClosure::do_klass(Klass* k) { MarkSweep::follow_klass(k); } 73 inline void MarkAndPushClosure::do_cld(ClassLoaderData* cld) { MarkSweep::follow_cld(cld); } 74 75 template <class T> inline void MarkSweep::adjust_pointer(T* p) { 76 T heap_oop = RawAccess<>::oop_load(p); 77 if (!CompressedOops::is_null(heap_oop)) { 78 oop obj = CompressedOops::decode_not_null(heap_oop); 79 assert(Universe::heap()->is_in(obj), "should be in heap"); 80 81 oop new_obj = oop(obj->mark_raw().decode_pointer()); 82 83 assert(new_obj != NULL || // is forwarding ptr? 84 obj->mark_raw() == markWord::prototype() || // not gc marked? 85 (UseBiasedLocking && obj->mark_raw().has_bias_pattern()), 86 // not gc marked? 87 "should be forwarded"); 88 89 if (new_obj != NULL) { 90 DEBUG_ONLY(Universe::heap()->check_oop_location((HeapWord*)new_obj);) 91 RawAccess<IS_NOT_NULL>::oop_store(p, new_obj); 92 } 93 } 94 } 95 96 template <typename T> 97 void AdjustPointerClosure::do_oop_work(T* p) { MarkSweep::adjust_pointer(p); } 98 inline void AdjustPointerClosure::do_oop(oop* p) { do_oop_work(p); } 99 inline void AdjustPointerClosure::do_oop(narrowOop* p) { do_oop_work(p); } 100 101 102 inline int MarkSweep::adjust_pointers(oop obj) { 103 return obj->oop_iterate_size(&MarkSweep::adjust_pointer_closure); 104 } 105 106 #endif // SHARE_GC_SERIAL_MARKSWEEP_INLINE_HPP