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_OBJECT_H_ 18 #define ART_RUNTIME_MIRROR_OBJECT_H_ 19 20 #include "base/casts.h" 21 #include "base/logging.h" 22 #include "base/macros.h" 23 #include "cutils/atomic-inline.h" 24 #include "offsets.h" 25 26 namespace art { 27 28 class ImageWriter; 29 struct ObjectOffsets; 30 class Thread; 31 32 namespace mirror { 33 34 class ArtField; 35 class ArtMethod; 36 class Array; 37 class Class; 38 template<class T> class ObjectArray; 39 template<class T> class PrimitiveArray; 40 typedef PrimitiveArray<uint8_t> BooleanArray; 41 typedef PrimitiveArray<int8_t> ByteArray; 42 typedef PrimitiveArray<uint16_t> CharArray; 43 typedef PrimitiveArray<double> DoubleArray; 44 typedef PrimitiveArray<float> FloatArray; 45 typedef PrimitiveArray<int32_t> IntArray; 46 typedef PrimitiveArray<int64_t> LongArray; 47 typedef PrimitiveArray<int16_t> ShortArray; 48 class String; 49 class Throwable; 50 51 // Classes shared with the managed side of the world need to be packed so that they don't have 52 // extra platform specific padding. 53 #define MANAGED PACKED(4) 54 55 // Fields within mirror objects aren't accessed directly so that the appropriate amount of 56 // handshaking is done with GC (for example, read and write barriers). This macro is used to 57 // compute an offset for the Set/Get methods defined in Object that can safely access fields. 58 #define OFFSET_OF_OBJECT_MEMBER(type, field) \ 59 MemberOffset(OFFSETOF_MEMBER(type, field)) 60 61 const bool kCheckFieldAssignments = false; 62 63 // C++ mirror of java.lang.Object 64 class MANAGED Object { 65 public: 66 static MemberOffset ClassOffset() { 67 return OFFSET_OF_OBJECT_MEMBER(Object, klass_); 68 } 69 70 Class* GetClass() const; 71 72 void SetClass(Class* new_klass); 73 74 // The verifier treats all interfaces as java.lang.Object and relies on runtime checks in 75 // invoke-interface to detect incompatible interface types. 76 bool VerifierInstanceOf(const Class* klass) const 77 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 78 79 bool InstanceOf(const Class* klass) const 80 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 81 82 size_t SizeOf() const SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 83 84 Object* Clone(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 85 86 int32_t IdentityHashCode() const { 87 #ifdef MOVING_GARBAGE_COLLECTOR 88 // TODO: we'll need to use the Object's internal concept of identity 89 UNIMPLEMENTED(FATAL); 90 #endif 91 return reinterpret_cast<int32_t>(this); 92 } 93 94 static MemberOffset MonitorOffset() { 95 return OFFSET_OF_OBJECT_MEMBER(Object, monitor_); 96 } 97 98 volatile int32_t* GetRawLockWordAddress() { 99 byte* raw_addr = reinterpret_cast<byte*>(this) + 100 OFFSET_OF_OBJECT_MEMBER(Object, monitor_).Int32Value(); 101 int32_t* word_addr = reinterpret_cast<int32_t*>(raw_addr); 102 return const_cast<volatile int32_t*>(word_addr); 103 } 104 105 uint32_t GetThinLockId(); 106 107 void MonitorEnter(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 108 EXCLUSIVE_LOCK_FUNCTION(monitor_lock_); 109 110 bool MonitorExit(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 111 UNLOCK_FUNCTION(monitor_lock_); 112 113 void Notify(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 114 115 void NotifyAll(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 116 117 void Wait(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 118 119 void Wait(Thread* self, int64_t timeout, int32_t nanos) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 120 121 bool IsClass() const; 122 123 Class* AsClass(); 124 125 const Class* AsClass() const; 126 127 bool IsObjectArray() const; 128 129 template<class T> 130 ObjectArray<T>* AsObjectArray(); 131 132 template<class T> 133 const ObjectArray<T>* AsObjectArray() const; 134 135 bool IsArrayInstance() const; 136 137 Array* AsArray(); 138 139 const Array* AsArray() const; 140 141 BooleanArray* AsBooleanArray(); 142 ByteArray* AsByteArray(); 143 CharArray* AsCharArray(); 144 ShortArray* AsShortArray(); 145 IntArray* AsIntArray(); 146 LongArray* AsLongArray(); 147 148 String* AsString(); 149 150 Throwable* AsThrowable() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 151 152 bool IsArtMethod() const; 153 154 ArtMethod* AsArtMethod(); 155 156 const ArtMethod* AsArtMethod() const; 157 158 bool IsArtField() const SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 159 160 ArtField* AsArtField() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 161 162 const ArtField* AsArtField() const SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 163 164 bool IsReferenceInstance() const; 165 166 bool IsWeakReferenceInstance() const; 167 168 bool IsSoftReferenceInstance() const; 169 170 bool IsFinalizerReferenceInstance() const; 171 172 bool IsPhantomReferenceInstance() const; 173 174 // Accessors for Java type fields 175 template<class T> 176 T GetFieldObject(MemberOffset field_offset, bool is_volatile) const { 177 T result = reinterpret_cast<T>(GetField32(field_offset, is_volatile)); 178 VerifyObject(result); 179 return result; 180 } 181 182 void SetFieldObject(MemberOffset field_offset, const Object* new_value, bool is_volatile, 183 bool this_is_valid = true) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 184 VerifyObject(new_value); 185 SetField32(field_offset, reinterpret_cast<uint32_t>(new_value), is_volatile, this_is_valid); 186 if (new_value != NULL) { 187 CheckFieldAssignment(field_offset, new_value); 188 WriteBarrierField(this, field_offset, new_value); 189 } 190 } 191 192 uint32_t GetField32(MemberOffset field_offset, bool is_volatile) const { 193 VerifyObject(this); 194 const byte* raw_addr = reinterpret_cast<const byte*>(this) + field_offset.Int32Value(); 195 const int32_t* word_addr = reinterpret_cast<const int32_t*>(raw_addr); 196 if (UNLIKELY(is_volatile)) { 197 return android_atomic_acquire_load(word_addr); 198 } else { 199 return *word_addr; 200 } 201 } 202 203 void SetField32(MemberOffset field_offset, uint32_t new_value, bool is_volatile, 204 bool this_is_valid = true) { 205 if (this_is_valid) { 206 VerifyObject(this); 207 } 208 byte* raw_addr = reinterpret_cast<byte*>(this) + field_offset.Int32Value(); 209 uint32_t* word_addr = reinterpret_cast<uint32_t*>(raw_addr); 210 if (UNLIKELY(is_volatile)) { 211 /* 212 * TODO: add an android_atomic_synchronization_store() function and 213 * use it in the 32-bit volatile set handlers. On some platforms we 214 * can use a fast atomic instruction and avoid the barriers. 215 */ 216 ANDROID_MEMBAR_STORE(); 217 *word_addr = new_value; 218 ANDROID_MEMBAR_FULL(); 219 } else { 220 *word_addr = new_value; 221 } 222 } 223 224 uint64_t GetField64(MemberOffset field_offset, bool is_volatile) const; 225 226 void SetField64(MemberOffset field_offset, uint64_t new_value, bool is_volatile); 227 228 protected: 229 // Accessors for non-Java type fields 230 template<class T> 231 T GetFieldPtr(MemberOffset field_offset, bool is_volatile) const { 232 return reinterpret_cast<T>(GetField32(field_offset, is_volatile)); 233 } 234 235 template<typename T> 236 void SetFieldPtr(MemberOffset field_offset, T new_value, bool is_volatile, bool this_is_valid = true) { 237 SetField32(field_offset, reinterpret_cast<uint32_t>(new_value), is_volatile, this_is_valid); 238 } 239 240 private: 241 static void VerifyObject(const Object* obj) ALWAYS_INLINE; 242 243 // Verify the type correctness of stores to fields. 244 void CheckFieldAssignmentImpl(MemberOffset field_offset, const Object* new_value) 245 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 246 void CheckFieldAssignment(MemberOffset field_offset, const Object* new_value) 247 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 248 if (kCheckFieldAssignments) { 249 CheckFieldAssignmentImpl(field_offset, new_value); 250 } 251 } 252 253 // Write barrier called post update to a reference bearing field. 254 static void WriteBarrierField(const Object* dst, MemberOffset offset, const Object* new_value); 255 256 Class* klass_; 257 258 uint32_t monitor_; 259 260 friend class art::ImageWriter; 261 friend struct art::ObjectOffsets; // for verifying offset information 262 DISALLOW_IMPLICIT_CONSTRUCTORS(Object); 263 }; 264 265 } // namespace mirror 266 } // namespace art 267 268 #endif // ART_RUNTIME_MIRROR_OBJECT_H_ 269
