1 /* 2 * Copyright (c) 2000, 2014, 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_IMPLEMENTATION_SHARED_MARKSWEEP_INLINE_HPP 26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_INLINE_HPP 27 28 #include "gc_implementation/shared/markSweep.hpp" 29 #include "gc_interface/collectedHeap.hpp" 30 #include "utilities/stack.inline.hpp" 31 #include "utilities/macros.hpp" 32 #if INCLUDE_ALL_GCS 33 #include "gc_implementation/g1/g1StringDedup.hpp" 34 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" 35 #endif // INCLUDE_ALL_GCS 36 37 inline void MarkSweep::mark_object(oop obj) { 38 #if INCLUDE_ALL_GCS 39 if (G1StringDedup::is_enabled()) { 40 // We must enqueue the object before it is marked 41 // as we otherwise can't read the object's age. 42 G1StringDedup::enqueue_from_mark(obj); 43 } 44 #endif 45 // some marks may contain information we need to preserve so we store them away 46 // and overwrite the mark. We'll restore it at the end of markSweep. 47 markOop mark = obj->mark(); 48 obj->set_mark(markOopDesc::prototype()->set_marked()); 49 50 if (mark->must_be_preserved(obj)) { 51 preserve_mark(obj, mark); 52 } 53 } 54 55 inline void MarkSweep::follow_klass(Klass* klass) { 56 oop op = klass->klass_holder(); 57 MarkSweep::mark_and_push(&op); 58 } 59 60 template <class T> inline void MarkSweep::follow_root(T* p) { 61 assert(!Universe::heap()->is_in_reserved(p), 62 "roots shouldn't be things within the heap"); 63 T heap_oop = oopDesc::load_heap_oop(p); 64 if (!oopDesc::is_null(heap_oop)) { 65 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); 66 if (!obj->mark()->is_marked()) { 67 mark_object(obj); 68 obj->follow_contents(); 69 } 70 } 71 follow_stack(); 72 } 73 74 template <class T> inline void MarkSweep::mark_and_push(T* p) { 75 // assert(Universe::heap()->is_in_reserved(p), "should be in object space"); 76 T heap_oop = oopDesc::load_heap_oop(p); 77 if (!oopDesc::is_null(heap_oop)) { 78 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); 79 if (!obj->mark()->is_marked()) { 80 mark_object(obj); 81 _marking_stack.push(obj); 82 } 83 } 84 } 85 86 void MarkSweep::push_objarray(oop obj, size_t index) { 87 ObjArrayTask task(obj, index); 88 assert(task.is_valid(), "bad ObjArrayTask"); 89 _objarray_stack.push(task); 90 } 91 92 template <class T> inline void MarkSweep::adjust_pointer(T* p) { 93 T heap_oop = oopDesc::load_heap_oop(p); 94 if (!oopDesc::is_null(heap_oop)) { 95 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); 96 oop new_obj = oop(obj->mark()->decode_pointer()); 97 assert(new_obj != NULL || // is forwarding ptr? 98 obj->mark() == markOopDesc::prototype() || // not gc marked? 99 (UseBiasedLocking && obj->mark()->has_bias_pattern()), 100 // not gc marked? 101 "should be forwarded"); 102 if (new_obj != NULL) { 103 assert(Universe::heap()->is_in_reserved(new_obj), 104 "should be in object space"); 105 oopDesc::encode_store_heap_oop_not_null(p, new_obj); 106 } 107 } 108 } 109 110 template <class T> inline void MarkSweep::KeepAliveClosure::do_oop_work(T* p) { 111 mark_and_push(p); 112 } 113 114 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_INLINE_HPP