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_LOADER_H_ 18 #define ART_RUNTIME_MIRROR_CLASS_LOADER_H_ 19 20 #include "base/mutex.h" 21 #include "object.h" 22 #include "object_reference.h" 23 #include "obj_ptr.h" 24 25 namespace art { 26 27 struct ClassLoaderOffsets; 28 class ClassTable; 29 class LinearAlloc; 30 31 namespace mirror { 32 33 class Class; 34 35 // C++ mirror of java.lang.ClassLoader 36 class MANAGED ClassLoader : public Object { 37 public: 38 // Size of an instance of java.lang.ClassLoader. InstanceSize()39 static constexpr uint32_t InstanceSize() { 40 return sizeof(ClassLoader); 41 } 42 GetParent()43 ClassLoader* GetParent() REQUIRES_SHARED(Locks::mutator_lock_) { 44 return GetFieldObject<ClassLoader>(OFFSET_OF_OBJECT_MEMBER(ClassLoader, parent_)); 45 } 46 GetClassTable()47 ClassTable* GetClassTable() REQUIRES_SHARED(Locks::mutator_lock_) { 48 return reinterpret_cast<ClassTable*>( 49 GetField64(OFFSET_OF_OBJECT_MEMBER(ClassLoader, class_table_))); 50 } 51 SetClassTable(ClassTable * class_table)52 void SetClassTable(ClassTable* class_table) REQUIRES_SHARED(Locks::mutator_lock_) { 53 SetField64<false>(OFFSET_OF_OBJECT_MEMBER(ClassLoader, class_table_), 54 reinterpret_cast<uint64_t>(class_table)); 55 } 56 GetAllocator()57 LinearAlloc* GetAllocator() REQUIRES_SHARED(Locks::mutator_lock_) { 58 return reinterpret_cast<LinearAlloc*>( 59 GetField64(OFFSET_OF_OBJECT_MEMBER(ClassLoader, allocator_))); 60 } 61 SetAllocator(LinearAlloc * allocator)62 void SetAllocator(LinearAlloc* allocator) REQUIRES_SHARED(Locks::mutator_lock_) { 63 SetField64<false>(OFFSET_OF_OBJECT_MEMBER(ClassLoader, allocator_), 64 reinterpret_cast<uint64_t>(allocator)); 65 } 66 67 private: 68 // Visit instance fields of the class loader as well as its associated classes. 69 // Null class loader is handled by ClassLinker::VisitClassRoots. 70 template <bool kVisitClasses, 71 VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, 72 ReadBarrierOption kReadBarrierOption = kWithReadBarrier, 73 typename Visitor> 74 void VisitReferences(ObjPtr<Class> klass, const Visitor& visitor) 75 REQUIRES_SHARED(Locks::mutator_lock_) 76 REQUIRES(!Locks::classlinker_classes_lock_); 77 78 // Field order required by test "ValidateFieldOrderOfJavaCppUnionClasses". 79 HeapReference<Object> packages_; 80 HeapReference<ClassLoader> parent_; 81 HeapReference<Object> proxyCache_; 82 // Native pointer to class table, need to zero this out when image writing. 83 uint32_t padding_ ATTRIBUTE_UNUSED; 84 uint64_t allocator_; 85 uint64_t class_table_; 86 87 friend struct art::ClassLoaderOffsets; // for verifying offset information 88 friend class Object; // For VisitReferences 89 DISALLOW_IMPLICIT_CONSTRUCTORS(ClassLoader); 90 }; 91 92 } // namespace mirror 93 } // namespace art 94 95 #endif // ART_RUNTIME_MIRROR_CLASS_LOADER_H_ 96