1 /* 2 * Copyright (c) 2000, 2015, 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_VM_GC_SERIAL_MARKSWEEP_INLINE_HPP 26 #define SHARE_VM_GC_SERIAL_MARKSWEEP_INLINE_HPP 27 28 #include "gc/serial/markSweep.hpp" 29 #include "gc/shared/collectedHeap.hpp" 30 #include "oops/instanceClassLoaderKlass.inline.hpp" 31 #include "oops/instanceKlass.inline.hpp" 32 #include "oops/instanceMirrorKlass.inline.hpp" 33 #include "oops/instanceRefKlass.inline.hpp" 34 #include "oops/markOop.inline.hpp" 35 #include "oops/objArrayKlass.inline.hpp" 36 #include "utilities/macros.hpp" 37 #include "utilities/stack.inline.hpp" 38 #if INCLUDE_ALL_GCS 39 #include "gc/g1/g1StringDedup.hpp" 40 #include "gc/g1/g1MarkSweep.hpp" 41 #endif // INCLUDE_ALL_GCS 42 43 inline void MarkSweep::mark_object(oop obj) { 44 #if INCLUDE_ALL_GCS 45 if (G1StringDedup::is_enabled()) { 46 // We must enqueue the object before it is marked 47 // as we otherwise can't read the object's age. 48 G1StringDedup::enqueue_from_mark(obj); 49 } 50 #endif 51 // some marks may contain information we need to preserve so we store them away 52 // and overwrite the mark. We'll restore it at the end of markSweep. 53 markOop mark = obj->mark(); 54 obj->set_mark(markOopDesc::prototype()->set_marked()); 55 56 if (mark->must_be_preserved(obj)) { 57 preserve_mark(obj, mark); 58 } 59 } 60 61 inline bool MarkSweep::is_archive_object(oop object) { 62 #if INCLUDE_ALL_GCS 63 return (G1MarkSweep::archive_check_enabled() && 64 G1MarkSweep::in_archive_range(object)); 65 #else 66 return false; 67 #endif 68 } 69 70 inline void MarkSweep::follow_klass(Klass* klass) { 71 oop op = klass->klass_holder(); 72 MarkSweep::mark_and_push(&op); 73 } 74 75 inline void MarkSweep::follow_object(oop obj) { 76 assert(obj->is_gc_marked(), "should be marked"); 77 78 obj->ms_follow_contents(); 79 } 80 81 template <class T> inline void MarkSweep::follow_root(T* p) { 82 assert(!Universe::heap()->is_in_reserved(p), 83 "roots shouldn't be things within the heap"); 84 T heap_oop = oopDesc::load_heap_oop(p); 85 if (!oopDesc::is_null(heap_oop)) { 86 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); 87 if (!obj->mark()->is_marked() && 88 !is_archive_object(obj)) { 89 mark_object(obj); 90 follow_object(obj); 91 } 92 } 93 follow_stack(); 94 } 95 96 template <class T> inline void MarkSweep::mark_and_push(T* p) { 97 // assert(Universe::heap()->is_in_reserved(p), "should be in object space"); 98 T heap_oop = oopDesc::load_heap_oop(p); 99 if (!oopDesc::is_null(heap_oop)) { 100 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); 101 if (!obj->mark()->is_marked() && 102 !is_archive_object(obj)) { 103 mark_object(obj); 104 _marking_stack.push(obj); 105 } 106 } 107 } 108 109 void MarkSweep::push_objarray(oop obj, size_t index) { 110 ObjArrayTask task(obj, index); 111 assert(task.is_valid(), "bad ObjArrayTask"); 112 _objarray_stack.push(task); 113 } 114 115 inline int MarkSweep::adjust_pointers(oop obj) { 116 return obj->ms_adjust_pointers(); 117 } 118 119 template <class T> inline void MarkSweep::adjust_pointer(T* p) { 120 T heap_oop = oopDesc::load_heap_oop(p); 121 if (!oopDesc::is_null(heap_oop)) { 122 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); 123 assert(Universe::heap()->is_in(obj), "should be in heap"); 124 125 oop new_obj = oop(obj->mark()->decode_pointer()); 126 assert(is_archive_object(obj) || // no forwarding of archive objects 127 new_obj != NULL || // is forwarding ptr? 128 obj->mark() == markOopDesc::prototype() || // not gc marked? 129 (UseBiasedLocking && obj->mark()->has_bias_pattern()), 130 // not gc marked? 131 "should be forwarded"); 132 if (new_obj != NULL) { 133 if (!is_archive_object(obj)) { 134 assert(Universe::heap()->is_in_reserved(new_obj), 135 "should be in object space"); 136 oopDesc::encode_store_heap_oop_not_null(p, new_obj); 137 } 138 } 139 } 140 } 141 142 template <class T> inline void MarkSweep::KeepAliveClosure::do_oop_work(T* p) { 143 mark_and_push(p); 144 } 145 146 #endif // SHARE_VM_GC_SERIAL_MARKSWEEP_INLINE_HPP