1 /* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 * 22 */ 23 24 #ifndef SHARE_VM_OOPS_INSTANCEMIRRORKLASS_INLINE_HPP 25 #define SHARE_VM_OOPS_INSTANCEMIRRORKLASS_INLINE_HPP 26 27 #include "classfile/javaClasses.hpp" 28 #include "oops/instanceKlass.inline.hpp" 29 #include "oops/instanceMirrorKlass.hpp" 30 #include "oops/klass.hpp" 31 #include "oops/oop.inline.hpp" 32 #include "utilities/debug.hpp" 33 #include "utilities/globalDefinitions.hpp" 34 #include "utilities/macros.hpp" 35 36 template <bool nv, typename T, class OopClosureType> 37 void InstanceMirrorKlass::oop_oop_iterate_statics_specialized(oop obj, OopClosureType* closure) { 38 T* p = (T*)start_of_static_fields(obj); 39 T* const end = p + java_lang_Class::static_oop_field_count(obj); 40 41 for (; p < end; ++p) { 42 Devirtualizer<nv>::do_oop(closure, p); 43 } 44 } 45 46 template <bool nv, class OopClosureType> 47 void InstanceMirrorKlass::oop_oop_iterate_statics(oop obj, OopClosureType* closure) { 48 if (UseCompressedOops) { 49 oop_oop_iterate_statics_specialized<nv, narrowOop>(obj, closure); 50 } else { 51 oop_oop_iterate_statics_specialized<nv, oop>(obj, closure); 52 } 53 } 54 55 template <bool nv, class OopClosureType> 56 void InstanceMirrorKlass::oop_oop_iterate(oop obj, OopClosureType* closure) { 57 InstanceKlass::oop_oop_iterate<nv>(obj, closure); 58 59 if (Devirtualizer<nv>::do_metadata(closure)) { 60 Klass* klass = java_lang_Class::as_Klass(obj); 61 // We'll get NULL for primitive mirrors. 62 if (klass != NULL) { 63 if (klass->is_instance_klass() && InstanceKlass::cast(klass)->is_anonymous()) { 64 // An anonymous class doesn't have its own class loader, so when handling 65 // the java mirror for an anonymous class we need to make sure its class 66 // loader data is claimed, this is done by calling do_cld explicitly. 67 // For non-anonymous classes the call to do_cld is made when the class 68 // loader itself is handled. 69 Devirtualizer<nv>::do_cld(closure, klass->class_loader_data()); 70 } else { 71 Devirtualizer<nv>::do_klass(closure, klass); 72 } 73 } else { 74 // We would like to assert here (as below) that if klass has been NULL, then 75 // this has been a mirror for a primitive type that we do not need to follow 76 // as they are always strong roots. 77 // However, we might get across a klass that just changed during CMS concurrent 78 // marking if allocation occurred in the old generation. 79 // This is benign here, as we keep alive all CLDs that were loaded during the 80 // CMS concurrent phase in the class loading, i.e. they will be iterated over 81 // and kept alive during remark. 82 // assert(java_lang_Class::is_primitive(obj), "Sanity check"); 83 } 84 } 85 86 oop_oop_iterate_statics<nv>(obj, closure); 87 } 88 89 #if INCLUDE_ALL_GCS 90 template <bool nv, class OopClosureType> 91 void InstanceMirrorKlass::oop_oop_iterate_reverse(oop obj, OopClosureType* closure) { 92 InstanceKlass::oop_oop_iterate_reverse<nv>(obj, closure); 93 94 InstanceMirrorKlass::oop_oop_iterate_statics<nv>(obj, closure); 95 } 96 #endif 97 98 template <bool nv, typename T, class OopClosureType> 99 void InstanceMirrorKlass::oop_oop_iterate_statics_specialized_bounded(oop obj, 100 OopClosureType* closure, 101 MemRegion mr) { 102 T* p = (T*)start_of_static_fields(obj); 103 T* end = p + java_lang_Class::static_oop_field_count(obj); 104 105 T* const l = (T*)mr.start(); 106 T* const h = (T*)mr.end(); 107 assert(mask_bits((intptr_t)l, sizeof(T)-1) == 0 && 108 mask_bits((intptr_t)h, sizeof(T)-1) == 0, 109 "bounded region must be properly aligned"); 110 111 if (p < l) { 112 p = l; 113 } 114 if (end > h) { 115 end = h; 116 } 117 118 for (;p < end; ++p) { 119 Devirtualizer<nv>::do_oop(closure, p); 120 } 121 } 122 123 template <bool nv, class OopClosureType> 124 void InstanceMirrorKlass::oop_oop_iterate_statics_bounded(oop obj, OopClosureType* closure, MemRegion mr) { 125 if (UseCompressedOops) { 126 oop_oop_iterate_statics_specialized_bounded<nv, narrowOop>(obj, closure, mr); 127 } else { 128 oop_oop_iterate_statics_specialized_bounded<nv, oop>(obj, closure, mr); 129 } 130 } 131 132 template <bool nv, class OopClosureType> 133 void InstanceMirrorKlass::oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr) { 134 InstanceKlass::oop_oop_iterate_bounded<nv>(obj, closure, mr); 135 136 if (Devirtualizer<nv>::do_metadata(closure)) { 137 if (mr.contains(obj)) { 138 Klass* klass = java_lang_Class::as_Klass(obj); 139 // We'll get NULL for primitive mirrors. 140 if (klass != NULL) { 141 Devirtualizer<nv>::do_klass(closure, klass); 142 } 143 } 144 } 145 146 oop_oop_iterate_statics_bounded<nv>(obj, closure, mr); 147 } 148 149 #define ALL_INSTANCE_MIRROR_KLASS_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ 150 OOP_OOP_ITERATE_DEFN( InstanceMirrorKlass, OopClosureType, nv_suffix) \ 151 OOP_OOP_ITERATE_DEFN_BOUNDED( InstanceMirrorKlass, OopClosureType, nv_suffix) \ 152 OOP_OOP_ITERATE_DEFN_BACKWARDS(InstanceMirrorKlass, OopClosureType, nv_suffix) 153 154 #endif // SHARE_VM_OOPS_INSTANCEMIRRORKLASS_INLINE_HPP