1 /* 2 * Copyright (c) 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_OOPS_INSTANCEREFKLASS_INLINE_HPP 26 #define SHARE_VM_OOPS_INSTANCEREFKLASS_INLINE_HPP 27 28 #include "classfile/javaClasses.hpp" 29 #include "gc/shared/referenceProcessor.hpp" 30 #include "oops/instanceKlass.inline.hpp" 31 #include "oops/instanceRefKlass.hpp" 32 #include "oops/oop.inline.hpp" 33 #include "utilities/debug.hpp" 34 #include "utilities/globalDefinitions.hpp" 35 #include "utilities/macros.hpp" 36 37 template <bool nv, typename T, class OopClosureType, class Contains> 38 void InstanceRefKlass::oop_oop_iterate_ref_processing_specialized(oop obj, OopClosureType* closure, Contains& contains) { 39 T* disc_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); 40 if (closure->apply_to_weak_ref_discovered_field()) { 41 Devirtualizer<nv>::do_oop(closure, disc_addr); 42 } 43 44 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); 45 T heap_oop = oopDesc::load_heap_oop(referent_addr); 46 ReferenceProcessor* rp = closure->_ref_processor; 47 if (!oopDesc::is_null(heap_oop)) { 48 oop referent = oopDesc::decode_heap_oop_not_null(heap_oop); 49 if (!referent->is_gc_marked() && (rp != NULL) && 50 rp->discover_reference(obj, reference_type())) { 51 return; 52 } else if (contains(referent_addr)) { 53 // treat referent as normal oop 54 Devirtualizer<nv>::do_oop(closure, referent_addr); 55 } 56 } 57 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); 58 T next_oop = oopDesc::load_heap_oop(next_addr); 59 // Treat discovered as normal oop, if ref is not "active" (next non-NULL) 60 if (!oopDesc::is_null(next_oop) && contains(disc_addr)) { 61 // i.e. ref is not "active" 62 debug_only( 63 if(TraceReferenceGC && PrintGCDetails) { 64 gclog_or_tty->print_cr(" Process discovered as normal " 65 PTR_FORMAT, p2i(disc_addr)); 66 } 67 ) 68 Devirtualizer<nv>::do_oop(closure, disc_addr); 69 } 70 // treat next as normal oop 71 if (contains(next_addr)) { 72 Devirtualizer<nv>::do_oop(closure, next_addr); 73 } 74 } 75 76 class AlwaysContains { 77 public: 78 template <typename T> bool operator()(T* p) const { return true; } 79 }; 80 81 template <bool nv, class OopClosureType> 82 void InstanceRefKlass::oop_oop_iterate_ref_processing(oop obj, OopClosureType* closure) { 83 AlwaysContains always_contains; 84 if (UseCompressedOops) { 85 oop_oop_iterate_ref_processing_specialized<nv, narrowOop>(obj, closure, always_contains); 86 } else { 87 oop_oop_iterate_ref_processing_specialized<nv, oop>(obj, closure, always_contains); 88 } 89 } 90 91 class MrContains { 92 const MemRegion _mr; 93 public: 94 MrContains(MemRegion mr) : _mr(mr) {} 95 template <typename T> bool operator()(T* p) const { return _mr.contains(p); } 96 }; 97 98 template <bool nv, class OopClosureType> 99 void InstanceRefKlass::oop_oop_iterate_ref_processing_bounded(oop obj, OopClosureType* closure, MemRegion mr) { 100 const MrContains contains(mr); 101 if (UseCompressedOops) { 102 oop_oop_iterate_ref_processing_specialized<nv, narrowOop>(obj, closure, contains); 103 } else { 104 oop_oop_iterate_ref_processing_specialized<nv, oop>(obj, closure, contains); 105 } 106 } 107 108 template <bool nv, class OopClosureType> 109 void InstanceRefKlass::oop_oop_iterate(oop obj, OopClosureType* closure) { 110 InstanceKlass::oop_oop_iterate<nv>(obj, closure); 111 112 oop_oop_iterate_ref_processing<nv>(obj, closure); 113 } 114 115 #if INCLUDE_ALL_GCS 116 template <bool nv, class OopClosureType> 117 void InstanceRefKlass::oop_oop_iterate_reverse(oop obj, OopClosureType* closure) { 118 InstanceKlass::oop_oop_iterate_reverse<nv>(obj, closure); 119 120 oop_oop_iterate_ref_processing<nv>(obj, closure); 121 } 122 #endif // INCLUDE_ALL_GCS 123 124 125 template <bool nv, class OopClosureType> 126 void InstanceRefKlass::oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr) { 127 InstanceKlass::oop_oop_iterate_bounded<nv>(obj, closure, mr); 128 129 oop_oop_iterate_ref_processing_bounded<nv>(obj, closure, mr); 130 } 131 132 // Macro to define InstanceRefKlass::oop_oop_iterate for virtual/nonvirtual for 133 // all closures. Macros calling macros above for each oop size. 134 #define ALL_INSTANCE_REF_KLASS_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ 135 OOP_OOP_ITERATE_DEFN( InstanceRefKlass, OopClosureType, nv_suffix) \ 136 OOP_OOP_ITERATE_DEFN_BOUNDED( InstanceRefKlass, OopClosureType, nv_suffix) \ 137 OOP_OOP_ITERATE_DEFN_BACKWARDS(InstanceRefKlass, OopClosureType, nv_suffix) 138 139 #endif // SHARE_VM_OOPS_INSTANCEREFKLASS_INLINE_HPP