1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ART_RUNTIME_MIRROR_CLASS_REFVISITOR_INL_H_ 18 #define ART_RUNTIME_MIRROR_CLASS_REFVISITOR_INL_H_ 19 20 #include "class-inl.h" 21 22 #include "art_field-inl.h" 23 #include "class_ext-inl.h" 24 25 namespace art { 26 namespace mirror { 27 28 template <bool kVisitNativeRoots, 29 VerifyObjectFlags kVerifyFlags, 30 ReadBarrierOption kReadBarrierOption, 31 typename Visitor> 32 inline void Class::VisitReferences(ObjPtr<Class> klass, const Visitor& visitor) { 33 VisitInstanceFieldsReferences<kVerifyFlags, kReadBarrierOption>(klass.Ptr(), visitor); 34 // Right after a class is allocated, but not yet loaded 35 // (ClassStatus::kNotReady, see ClassLinker::LoadClass()), GC may find it 36 // and scan it. IsTemp() may call Class::GetAccessFlags() but may 37 // fail in the DCHECK in Class::GetAccessFlags() because the class 38 // status is ClassStatus::kNotReady. To avoid it, rely on IsResolved() 39 // only. This is fine because a temp class never goes into the 40 // ClassStatus::kResolved state. 41 if (IsResolved<kVerifyFlags>()) { 42 // Temp classes don't ever populate imt/vtable or static fields and they are not even 43 // allocated with the right size for those. Also, unresolved classes don't have fields 44 // linked yet. 45 VisitStaticFieldsReferences<kVerifyFlags, kReadBarrierOption>(this, visitor); 46 } 47 if (kVisitNativeRoots) { 48 // Since this class is reachable, we must also visit the associated roots when we scan it. 49 VisitNativeRoots<kReadBarrierOption>( 50 visitor, Runtime::Current()->GetClassLinker()->GetImagePointerSize()); 51 } 52 } 53 54 template<ReadBarrierOption kReadBarrierOption, class Visitor> 55 void Class::VisitNativeRoots(Visitor& visitor, PointerSize pointer_size) { 56 VisitFields<kReadBarrierOption>([&](ArtField* field) REQUIRES_SHARED(art::Locks::mutator_lock_) { 57 field->VisitRoots(visitor); 58 if (kIsDebugBuild && IsResolved()) { 59 CHECK_EQ(field->GetDeclaringClass<kReadBarrierOption>(), this) 60 << GetStatus() << field->GetDeclaringClass()->PrettyClass() << " != " << PrettyClass(); 61 } 62 }); 63 // Don't use VisitMethods because we don't want to hit the class-ext methods twice. 64 for (ArtMethod& method : GetMethods(pointer_size)) { 65 method.VisitRoots<kReadBarrierOption>(visitor, pointer_size); 66 } 67 ObjPtr<ClassExt> ext(GetExtData<kDefaultVerifyFlags, kReadBarrierOption>()); 68 if (!ext.IsNull()) { 69 ext->VisitNativeRoots<kReadBarrierOption, Visitor>(visitor, pointer_size); 70 } 71 } 72 73 template<ReadBarrierOption kReadBarrierOption, class Visitor> 74 void Class::VisitMethods(Visitor visitor, PointerSize pointer_size) { 75 for (ArtMethod& method : GetMethods(pointer_size)) { 76 visitor(&method); 77 } 78 ObjPtr<ClassExt> ext(GetExtData<kDefaultVerifyFlags, kReadBarrierOption>()); 79 if (!ext.IsNull()) { 80 ext->VisitMethods<kReadBarrierOption, Visitor>(visitor, pointer_size); 81 } 82 } 83 84 template<ReadBarrierOption kReadBarrierOption, class Visitor> 85 void Class::VisitFields(Visitor visitor) { 86 for (ArtField& sfield : GetSFieldsUnchecked()) { 87 visitor(&sfield); 88 } 89 for (ArtField& ifield : GetIFieldsUnchecked()) { 90 visitor(&ifield); 91 } 92 } 93 94 } // namespace mirror 95 } // namespace art 96 97 #endif // ART_RUNTIME_MIRROR_CLASS_REFVISITOR_INL_H_ 98