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/locks.h" 21 #include "obj_ptr.h" 22 #include "object.h" 23 #include "object_reference.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 MIRROR_CLASS("Ljava/lang/ClassLoader;"); 39 40 // Size of an instance of java.lang.ClassLoader. InstanceSize()41 static constexpr uint32_t InstanceSize() { 42 return sizeof(ClassLoader); 43 } 44 45 ObjPtr<ClassLoader> GetParent() REQUIRES_SHARED(Locks::mutator_lock_); 46 47 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> GetClassTable()48 ClassTable* GetClassTable() REQUIRES_SHARED(Locks::mutator_lock_) { 49 return reinterpret_cast<ClassTable*>( 50 GetField64<kVerifyFlags>(OFFSET_OF_OBJECT_MEMBER(ClassLoader, class_table_))); 51 } 52 SetClassTable(ClassTable * class_table)53 void SetClassTable(ClassTable* class_table) REQUIRES_SHARED(Locks::mutator_lock_) { 54 SetField64<false>(OFFSET_OF_OBJECT_MEMBER(ClassLoader, class_table_), 55 reinterpret_cast<uint64_t>(class_table)); 56 } 57 GetAllocator()58 LinearAlloc* GetAllocator() REQUIRES_SHARED(Locks::mutator_lock_) { 59 return reinterpret_cast<LinearAlloc*>( 60 GetField64(OFFSET_OF_OBJECT_MEMBER(ClassLoader, allocator_))); 61 } 62 SetAllocator(LinearAlloc * allocator)63 void SetAllocator(LinearAlloc* allocator) REQUIRES_SHARED(Locks::mutator_lock_) { 64 SetField64<false>(OFFSET_OF_OBJECT_MEMBER(ClassLoader, allocator_), 65 reinterpret_cast<uint64_t>(allocator)); 66 } 67 68 private: 69 // Visit instance fields of the class loader as well as its associated classes. 70 // Null class loader is handled by ClassLinker::VisitClassRoots. 71 template <bool kVisitClasses, 72 VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, 73 ReadBarrierOption kReadBarrierOption = kWithReadBarrier, 74 typename Visitor> 75 void VisitReferences(ObjPtr<Class> klass, const Visitor& visitor) 76 REQUIRES_SHARED(Locks::mutator_lock_) 77 REQUIRES(!Locks::classlinker_classes_lock_); 78 79 // Field order required by test "ValidateFieldOrderOfJavaCppUnionClasses". 80 HeapReference<Object> packages_; 81 HeapReference<ClassLoader> parent_; 82 HeapReference<Object> proxyCache_; 83 // Native pointer to class table, need to zero this out when image writing. 84 uint32_t padding_ ATTRIBUTE_UNUSED; 85 uint64_t allocator_; 86 uint64_t class_table_; 87 88 friend struct art::ClassLoaderOffsets; // for verifying offset information 89 friend class Object; // For VisitReferences 90 DISALLOW_IMPLICIT_CONSTRUCTORS(ClassLoader); 91 }; 92 93 } // namespace mirror 94 } // namespace art 95 96 #endif // ART_RUNTIME_MIRROR_CLASS_LOADER_H_ 97