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_H_ 18 #define ART_RUNTIME_MIRROR_CLASS_H_ 19 20 #include <string_view> 21 22 #include "base/bit_utils.h" 23 #include "base/casts.h" 24 #include "base/stride_iterator.h" 25 #include "class_flags.h" 26 #include "class_status.h" 27 #include "dex/dex_file_types.h" 28 #include "dex/modifiers.h" 29 #include "dex/primitive.h" 30 #include "gc/allocator_type.h" 31 #include "object.h" 32 #include "object_array.h" 33 #include "read_barrier_option.h" 34 35 namespace art { 36 37 namespace dex { 38 struct ClassDef; 39 class TypeList; 40 } // namespace dex 41 42 namespace hiddenapi { 43 class AccessContext; 44 } // namespace hiddenapi 45 46 template<typename T> class ArraySlice; 47 class ArtField; 48 class ArtMethod; 49 struct ClassOffsets; 50 class DexFile; 51 template<class T> class Handle; 52 class ImTable; 53 enum InvokeType : uint32_t; 54 template <typename Iter> class IterationRange; 55 template<typename T> class LengthPrefixedArray; 56 enum class PointerSize : size_t; 57 class Signature; 58 template<size_t kNumReferences> class PACKED(4) StackHandleScope; 59 class Thread; 60 61 namespace mirror { 62 63 class ClassExt; 64 class ClassLoader; 65 class Constructor; 66 class DexCache; 67 class IfTable; 68 class Method; 69 template <typename T> struct PACKED(8) DexCachePair; 70 71 using StringDexCachePair = DexCachePair<String>; 72 using StringDexCacheType = std::atomic<StringDexCachePair>; 73 74 // C++ mirror of java.lang.Class 75 class MANAGED Class final : public Object { 76 public: 77 // A magic value for reference_instance_offsets_. Ignore the bits and walk the super chain when 78 // this is the value. 79 // [This is an unlikely "natural" value, since it would be 30 non-ref instance fields followed by 80 // 2 ref instance fields.] 81 static constexpr uint32_t kClassWalkSuper = 0xC0000000; 82 83 // Shift primitive type by kPrimitiveTypeSizeShiftShift to get the component type size shift 84 // Used for computing array size as follows: 85 // array_bytes = header_size + (elements << (primitive_type >> kPrimitiveTypeSizeShiftShift)) 86 static constexpr uint32_t kPrimitiveTypeSizeShiftShift = 16; 87 static constexpr uint32_t kPrimitiveTypeMask = (1u << kPrimitiveTypeSizeShiftShift) - 1; 88 89 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 90 ClassStatus GetStatus() REQUIRES_SHARED(Locks::mutator_lock_) { 91 // Avoid including "subtype_check_bits_and_status.h" to get the field. 92 // The ClassStatus is always in the 4 most-significant bits of status_. 93 return enum_cast<ClassStatus>( 94 static_cast<uint32_t>(GetField32Volatile<kVerifyFlags>(StatusOffset())) >> (32 - 4)); 95 } 96 97 // This is static because 'this' may be moved by GC. 98 static void SetStatus(Handle<Class> h_this, ClassStatus new_status, Thread* self) 99 REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!Roles::uninterruptible_); 100 101 static constexpr MemberOffset StatusOffset() { 102 return MemberOffset(OFFSET_OF_OBJECT_MEMBER(Class, status_)); 103 } 104 105 // Returns true if the class has been retired. 106 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 107 bool IsRetired() REQUIRES_SHARED(Locks::mutator_lock_) { 108 return GetStatus<kVerifyFlags>() == ClassStatus::kRetired; 109 } 110 111 // Returns true if the class has failed to link. 112 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 113 bool IsErroneousUnresolved() REQUIRES_SHARED(Locks::mutator_lock_) { 114 return GetStatus<kVerifyFlags>() == ClassStatus::kErrorUnresolved; 115 } 116 117 // Returns true if the class has failed to initialize. 118 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 119 bool IsErroneousResolved() REQUIRES_SHARED(Locks::mutator_lock_) { 120 return GetStatus<kVerifyFlags>() == ClassStatus::kErrorResolved; 121 } 122 123 // Returns true if the class status indicets that the class has failed to link or initialize. 124 static bool IsErroneous(ClassStatus status) { 125 return status == ClassStatus::kErrorUnresolved || status == ClassStatus::kErrorResolved; 126 } 127 128 // Returns true if the class has failed to link or initialize. 129 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 130 bool IsErroneous() REQUIRES_SHARED(Locks::mutator_lock_) { 131 return IsErroneous(GetStatus<kVerifyFlags>()); 132 } 133 134 // Returns true if the class has been loaded. 135 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 136 bool IsIdxLoaded() REQUIRES_SHARED(Locks::mutator_lock_) { 137 return GetStatus<kVerifyFlags>() >= ClassStatus::kIdx; 138 } 139 140 // Returns true if the class has been loaded. 141 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 142 bool IsLoaded() REQUIRES_SHARED(Locks::mutator_lock_) { 143 return GetStatus<kVerifyFlags>() >= ClassStatus::kLoaded; 144 } 145 146 // Returns true if the class has been linked. 147 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 148 bool IsResolved() REQUIRES_SHARED(Locks::mutator_lock_) { 149 ClassStatus status = GetStatus<kVerifyFlags>(); 150 return status >= ClassStatus::kResolved || status == ClassStatus::kErrorResolved; 151 } 152 153 // Returns true if the class should be verified at runtime. 154 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 155 bool ShouldVerifyAtRuntime() REQUIRES_SHARED(Locks::mutator_lock_) { 156 return GetStatus<kVerifyFlags>() == ClassStatus::kRetryVerificationAtRuntime; 157 } 158 159 // Returns true if the class has been verified. 160 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 161 bool IsVerified() REQUIRES_SHARED(Locks::mutator_lock_) { 162 return GetStatus<kVerifyFlags>() >= ClassStatus::kVerified; 163 } 164 165 // Returns true if the class is initializing. 166 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 167 bool IsInitializing() REQUIRES_SHARED(Locks::mutator_lock_) { 168 return GetStatus<kVerifyFlags>() >= ClassStatus::kInitializing; 169 } 170 171 // Returns true if the class is initialized. 172 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 173 bool IsInitialized() REQUIRES_SHARED(Locks::mutator_lock_) { 174 return GetStatus<kVerifyFlags>() == ClassStatus::kInitialized; 175 } 176 177 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 178 ALWAYS_INLINE uint32_t GetAccessFlags() REQUIRES_SHARED(Locks::mutator_lock_) { 179 if (kIsDebugBuild) { 180 GetAccessFlagsDCheck<kVerifyFlags>(); 181 } 182 return GetField32<kVerifyFlags>(AccessFlagsOffset()); 183 } 184 185 static constexpr MemberOffset AccessFlagsOffset() { 186 return OFFSET_OF_OBJECT_MEMBER(Class, access_flags_); 187 } 188 189 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 190 ALWAYS_INLINE uint32_t GetClassFlags() REQUIRES_SHARED(Locks::mutator_lock_) { 191 return GetField32<kVerifyFlags>(OFFSET_OF_OBJECT_MEMBER(Class, class_flags_)); 192 } 193 void SetClassFlags(uint32_t new_flags) REQUIRES_SHARED(Locks::mutator_lock_); 194 195 void SetAccessFlags(uint32_t new_access_flags) REQUIRES_SHARED(Locks::mutator_lock_); 196 197 // Returns true if the class is an enum. 198 ALWAYS_INLINE bool IsEnum() REQUIRES_SHARED(Locks::mutator_lock_) { 199 return (GetAccessFlags() & kAccEnum) != 0; 200 } 201 202 // Returns true if the class is an interface. 203 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 204 ALWAYS_INLINE bool IsInterface() REQUIRES_SHARED(Locks::mutator_lock_) { 205 return (GetAccessFlags<kVerifyFlags>() & kAccInterface) != 0; 206 } 207 208 // Returns true if the class is declared public. 209 ALWAYS_INLINE bool IsPublic() REQUIRES_SHARED(Locks::mutator_lock_) { 210 return (GetAccessFlags() & kAccPublic) != 0; 211 } 212 213 // Returns true if the class is declared final. 214 ALWAYS_INLINE bool IsFinal() REQUIRES_SHARED(Locks::mutator_lock_) { 215 return (GetAccessFlags() & kAccFinal) != 0; 216 } 217 218 ALWAYS_INLINE bool IsFinalizable() REQUIRES_SHARED(Locks::mutator_lock_) { 219 return (GetAccessFlags() & kAccClassIsFinalizable) != 0; 220 } 221 222 ALWAYS_INLINE bool ShouldSkipHiddenApiChecks() REQUIRES_SHARED(Locks::mutator_lock_) { 223 return (GetAccessFlags() & kAccSkipHiddenapiChecks) != 0; 224 } 225 226 ALWAYS_INLINE void SetSkipHiddenApiChecks() REQUIRES_SHARED(Locks::mutator_lock_) { 227 uint32_t flags = GetAccessFlags(); 228 SetAccessFlags(flags | kAccSkipHiddenapiChecks); 229 } 230 231 ALWAYS_INLINE void SetRecursivelyInitialized() REQUIRES_SHARED(Locks::mutator_lock_); 232 233 ALWAYS_INLINE void SetHasDefaultMethods() REQUIRES_SHARED(Locks::mutator_lock_); 234 235 ALWAYS_INLINE void SetFinalizable() REQUIRES_SHARED(Locks::mutator_lock_) { 236 uint32_t flags = GetField32(OFFSET_OF_OBJECT_MEMBER(Class, access_flags_)); 237 SetAccessFlags(flags | kAccClassIsFinalizable); 238 } 239 240 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 241 ALWAYS_INLINE bool IsStringClass() REQUIRES_SHARED(Locks::mutator_lock_) { 242 return (GetClassFlags<kVerifyFlags>() & kClassFlagString) != 0; 243 } 244 245 ALWAYS_INLINE void SetStringClass() REQUIRES_SHARED(Locks::mutator_lock_) { 246 SetClassFlags(kClassFlagString | kClassFlagNoReferenceFields); 247 } 248 249 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 250 ALWAYS_INLINE bool IsClassLoaderClass() REQUIRES_SHARED(Locks::mutator_lock_) { 251 return GetClassFlags<kVerifyFlags>() == kClassFlagClassLoader; 252 } 253 254 ALWAYS_INLINE void SetClassLoaderClass() REQUIRES_SHARED(Locks::mutator_lock_) { 255 SetClassFlags(kClassFlagClassLoader); 256 } 257 258 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 259 ALWAYS_INLINE bool IsDexCacheClass() REQUIRES_SHARED(Locks::mutator_lock_) { 260 return (GetClassFlags<kVerifyFlags>() & kClassFlagDexCache) != 0; 261 } 262 263 ALWAYS_INLINE void SetDexCacheClass() REQUIRES_SHARED(Locks::mutator_lock_) { 264 SetClassFlags(GetClassFlags() | kClassFlagDexCache); 265 } 266 267 // Returns true if the class is abstract. 268 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 269 ALWAYS_INLINE bool IsAbstract() REQUIRES_SHARED(Locks::mutator_lock_) { 270 return (GetAccessFlags<kVerifyFlags>() & kAccAbstract) != 0; 271 } 272 273 // Returns true if the class is an annotation. 274 ALWAYS_INLINE bool IsAnnotation() REQUIRES_SHARED(Locks::mutator_lock_) { 275 return (GetAccessFlags() & kAccAnnotation) != 0; 276 } 277 278 // Returns true if the class is synthetic. 279 ALWAYS_INLINE bool IsSynthetic() REQUIRES_SHARED(Locks::mutator_lock_) { 280 return (GetAccessFlags() & kAccSynthetic) != 0; 281 } 282 283 // Return whether the class had run the verifier at least once. 284 // This does not necessarily mean that access checks are avoidable, 285 // since the class methods might still need to be run with access checks. 286 bool WasVerificationAttempted() REQUIRES_SHARED(Locks::mutator_lock_) { 287 return (GetAccessFlags() & kAccVerificationAttempted) != 0; 288 } 289 290 // Mark the class as having gone through a verification attempt. 291 // Mutually exclusive from whether or not each method is allowed to skip access checks. 292 void SetVerificationAttempted() REQUIRES_SHARED(Locks::mutator_lock_) { 293 uint32_t flags = GetField32(OFFSET_OF_OBJECT_MEMBER(Class, access_flags_)); 294 if ((flags & kAccVerificationAttempted) == 0) { 295 SetAccessFlags(flags | kAccVerificationAttempted); 296 } 297 } 298 299 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 300 bool IsTypeOfReferenceClass() REQUIRES_SHARED(Locks::mutator_lock_) { 301 return (GetClassFlags<kVerifyFlags>() & kClassFlagReference) != 0; 302 } 303 304 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 305 bool IsWeakReferenceClass() REQUIRES_SHARED(Locks::mutator_lock_) { 306 return GetClassFlags<kVerifyFlags>() == kClassFlagWeakReference; 307 } 308 309 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 310 bool IsSoftReferenceClass() REQUIRES_SHARED(Locks::mutator_lock_) { 311 return GetClassFlags<kVerifyFlags>() == kClassFlagSoftReference; 312 } 313 314 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 315 bool IsFinalizerReferenceClass() REQUIRES_SHARED(Locks::mutator_lock_) { 316 return GetClassFlags<kVerifyFlags>() == kClassFlagFinalizerReference; 317 } 318 319 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 320 bool IsPhantomReferenceClass() REQUIRES_SHARED(Locks::mutator_lock_) { 321 return GetClassFlags<kVerifyFlags>() == kClassFlagPhantomReference; 322 } 323 324 // Can references of this type be assigned to by things of another type? For non-array types 325 // this is a matter of whether sub-classes may exist - which they can't if the type is final. 326 // For array classes, where all the classes are final due to there being no sub-classes, an 327 // Object[] may be assigned to by a String[] but a String[] may not be assigned to by other 328 // types as the component is final. 329 bool CannotBeAssignedFromOtherTypes() REQUIRES_SHARED(Locks::mutator_lock_); 330 331 // Returns true if this class is the placeholder and should retire and 332 // be replaced with a class with the right size for embedded imt/vtable. 333 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 334 bool IsTemp() REQUIRES_SHARED(Locks::mutator_lock_) { 335 ClassStatus s = GetStatus<kVerifyFlags>(); 336 return s < ClassStatus::kResolving && 337 s != ClassStatus::kErrorResolved && 338 ShouldHaveEmbeddedVTable<kVerifyFlags>(); 339 } 340 341 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, 342 ReadBarrierOption kReadBarrierOption = kWithReadBarrier> 343 ObjPtr<String> GetName() REQUIRES_SHARED(Locks::mutator_lock_); // Returns the cached name. 344 void SetName(ObjPtr<String> name) REQUIRES_SHARED(Locks::mutator_lock_); // Sets the cached name. 345 // Computes the name, then sets the cached value. 346 static ObjPtr<String> ComputeName(Handle<Class> h_this) REQUIRES_SHARED(Locks::mutator_lock_) 347 REQUIRES(!Roles::uninterruptible_); 348 349 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 350 bool IsProxyClass() REQUIRES_SHARED(Locks::mutator_lock_) { 351 // Read access flags without using getter as whether something is a proxy can be check in 352 // any loaded state 353 // TODO: switch to a check if the super class is java.lang.reflect.Proxy? 354 uint32_t access_flags = GetField32<kVerifyFlags>(OFFSET_OF_OBJECT_MEMBER(Class, access_flags_)); 355 return (access_flags & kAccClassIsProxy) != 0; 356 } 357 358 static constexpr MemberOffset PrimitiveTypeOffset() { 359 return OFFSET_OF_OBJECT_MEMBER(Class, primitive_type_); 360 } 361 362 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 363 Primitive::Type GetPrimitiveType() ALWAYS_INLINE REQUIRES_SHARED(Locks::mutator_lock_); 364 365 void SetPrimitiveType(Primitive::Type new_type) REQUIRES_SHARED(Locks::mutator_lock_) { 366 DCHECK_EQ(sizeof(Primitive::Type), sizeof(int32_t)); 367 uint32_t v32 = static_cast<uint32_t>(new_type); 368 DCHECK_EQ(v32 & kPrimitiveTypeMask, v32) << "upper 16 bits aren't zero"; 369 // Store the component size shift in the upper 16 bits. 370 v32 |= Primitive::ComponentSizeShift(new_type) << kPrimitiveTypeSizeShiftShift; 371 SetField32Transaction(OFFSET_OF_OBJECT_MEMBER(Class, primitive_type_), v32); 372 } 373 374 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 375 size_t GetPrimitiveTypeSizeShift() ALWAYS_INLINE REQUIRES_SHARED(Locks::mutator_lock_); 376 377 // Returns true if the class is a primitive type. 378 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 379 bool IsPrimitive() REQUIRES_SHARED(Locks::mutator_lock_) { 380 return GetPrimitiveType<kVerifyFlags>() != Primitive::kPrimNot; 381 } 382 383 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 384 bool IsPrimitiveBoolean() REQUIRES_SHARED(Locks::mutator_lock_) { 385 return GetPrimitiveType<kVerifyFlags>() == Primitive::kPrimBoolean; 386 } 387 388 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 389 bool IsPrimitiveByte() REQUIRES_SHARED(Locks::mutator_lock_) { 390 return GetPrimitiveType<kVerifyFlags>() == Primitive::kPrimByte; 391 } 392 393 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 394 bool IsPrimitiveChar() REQUIRES_SHARED(Locks::mutator_lock_) { 395 return GetPrimitiveType<kVerifyFlags>() == Primitive::kPrimChar; 396 } 397 398 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 399 bool IsPrimitiveShort() REQUIRES_SHARED(Locks::mutator_lock_) { 400 return GetPrimitiveType<kVerifyFlags>() == Primitive::kPrimShort; 401 } 402 403 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 404 bool IsPrimitiveInt() REQUIRES_SHARED(Locks::mutator_lock_) { 405 return GetPrimitiveType() == Primitive::kPrimInt; 406 } 407 408 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 409 bool IsPrimitiveLong() REQUIRES_SHARED(Locks::mutator_lock_) { 410 return GetPrimitiveType<kVerifyFlags>() == Primitive::kPrimLong; 411 } 412 413 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 414 bool IsPrimitiveFloat() REQUIRES_SHARED(Locks::mutator_lock_) { 415 return GetPrimitiveType<kVerifyFlags>() == Primitive::kPrimFloat; 416 } 417 418 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 419 bool IsPrimitiveDouble() REQUIRES_SHARED(Locks::mutator_lock_) { 420 return GetPrimitiveType<kVerifyFlags>() == Primitive::kPrimDouble; 421 } 422 423 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 424 bool IsPrimitiveVoid() REQUIRES_SHARED(Locks::mutator_lock_) { 425 return GetPrimitiveType<kVerifyFlags>() == Primitive::kPrimVoid; 426 } 427 428 // Depth of class from java.lang.Object 429 uint32_t Depth() REQUIRES_SHARED(Locks::mutator_lock_); 430 431 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 432 bool IsArrayClass() REQUIRES_SHARED(Locks::mutator_lock_); 433 434 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 435 bool IsClassClass() REQUIRES_SHARED(Locks::mutator_lock_); 436 437 bool IsThrowableClass() REQUIRES_SHARED(Locks::mutator_lock_); 438 439 static constexpr MemberOffset ComponentTypeOffset() { 440 return OFFSET_OF_OBJECT_MEMBER(Class, component_type_); 441 } 442 443 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, 444 ReadBarrierOption kReadBarrierOption = kWithReadBarrier> 445 ObjPtr<Class> GetComponentType() REQUIRES_SHARED(Locks::mutator_lock_); 446 447 void SetComponentType(ObjPtr<Class> new_component_type) REQUIRES_SHARED(Locks::mutator_lock_); 448 449 size_t GetComponentSize() REQUIRES_SHARED(Locks::mutator_lock_); 450 451 size_t GetComponentSizeShift() REQUIRES_SHARED(Locks::mutator_lock_); 452 453 bool IsObjectClass() REQUIRES_SHARED(Locks::mutator_lock_); 454 455 bool IsInstantiableNonArray() REQUIRES_SHARED(Locks::mutator_lock_); 456 457 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 458 bool IsInstantiable() REQUIRES_SHARED(Locks::mutator_lock_); 459 460 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 461 ALWAYS_INLINE bool IsObjectArrayClass() REQUIRES_SHARED(Locks::mutator_lock_); 462 463 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 464 bool IsPrimitiveArray() REQUIRES_SHARED(Locks::mutator_lock_); 465 466 // Creates a raw object instance but does not invoke the default constructor. 467 template<bool kIsInstrumented, bool kCheckAddFinalizer = true> 468 ALWAYS_INLINE ObjPtr<Object> Alloc(Thread* self, gc::AllocatorType allocator_type) 469 REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!Roles::uninterruptible_); 470 471 ObjPtr<Object> AllocObject(Thread* self) 472 REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!Roles::uninterruptible_); 473 ObjPtr<Object> AllocNonMovableObject(Thread* self) 474 REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!Roles::uninterruptible_); 475 476 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 477 ALWAYS_INLINE bool IsVariableSize() REQUIRES_SHARED(Locks::mutator_lock_); 478 479 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 480 uint32_t SizeOf() REQUIRES_SHARED(Locks::mutator_lock_) { 481 return GetField32<kVerifyFlags>(OFFSET_OF_OBJECT_MEMBER(Class, class_size_)); 482 } 483 484 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 485 uint32_t GetClassSize() REQUIRES_SHARED(Locks::mutator_lock_) { 486 return GetField32<kVerifyFlags>(OFFSET_OF_OBJECT_MEMBER(Class, class_size_)); 487 } 488 489 void SetClassSize(uint32_t new_class_size) 490 REQUIRES_SHARED(Locks::mutator_lock_); 491 492 // Compute how many bytes would be used a class with the given elements. 493 static uint32_t ComputeClassSize(bool has_embedded_vtable, 494 uint32_t num_vtable_entries, 495 uint32_t num_8bit_static_fields, 496 uint32_t num_16bit_static_fields, 497 uint32_t num_32bit_static_fields, 498 uint32_t num_64bit_static_fields, 499 uint32_t num_ref_static_fields, 500 PointerSize pointer_size); 501 502 // The size of java.lang.Class.class. 503 static uint32_t ClassClassSize(PointerSize pointer_size) { 504 // The number of vtable entries in java.lang.Class. 505 uint32_t vtable_entries = Object::kVTableLength + 67; 506 return ComputeClassSize(true, vtable_entries, 0, 0, 4, 1, 0, pointer_size); 507 } 508 509 // The size of a java.lang.Class representing a primitive such as int.class. 510 static uint32_t PrimitiveClassSize(PointerSize pointer_size) { 511 return ComputeClassSize(false, 0, 0, 0, 0, 0, 0, pointer_size); 512 } 513 514 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 515 uint32_t GetObjectSize() REQUIRES_SHARED(Locks::mutator_lock_); 516 static constexpr MemberOffset ObjectSizeOffset() { 517 return OFFSET_OF_OBJECT_MEMBER(Class, object_size_); 518 } 519 static constexpr MemberOffset ObjectSizeAllocFastPathOffset() { 520 return OFFSET_OF_OBJECT_MEMBER(Class, object_size_alloc_fast_path_); 521 } 522 523 ALWAYS_INLINE void SetObjectSize(uint32_t new_object_size) REQUIRES_SHARED(Locks::mutator_lock_); 524 525 void SetObjectSizeAllocFastPath(uint32_t new_object_size) REQUIRES_SHARED(Locks::mutator_lock_); 526 527 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 528 uint32_t GetObjectSizeAllocFastPath() REQUIRES_SHARED(Locks::mutator_lock_); 529 530 void SetObjectSizeWithoutChecks(uint32_t new_object_size) 531 REQUIRES_SHARED(Locks::mutator_lock_) { 532 // Not called within a transaction. 533 return SetField32<false, false, kVerifyNone>( 534 OFFSET_OF_OBJECT_MEMBER(Class, object_size_), new_object_size); 535 } 536 537 // Returns true if this class is in the same packages as that class. 538 bool IsInSamePackage(ObjPtr<Class> that) REQUIRES_SHARED(Locks::mutator_lock_); 539 540 static bool IsInSamePackage(std::string_view descriptor1, std::string_view descriptor2); 541 542 // Returns true if this class can access that class. 543 bool CanAccess(ObjPtr<Class> that) REQUIRES_SHARED(Locks::mutator_lock_); 544 545 // Can this class access a member in the provided class with the provided member access flags? 546 // Note that access to the class isn't checked in case the declaring class is protected and the 547 // method has been exposed by a public sub-class 548 bool CanAccessMember(ObjPtr<Class> access_to, uint32_t member_flags) 549 REQUIRES_SHARED(Locks::mutator_lock_); 550 551 // Can this class access a resolved field? 552 // Note that access to field's class is checked and this may require looking up the class 553 // referenced by the FieldId in the DexFile in case the declaring class is inaccessible. 554 bool CanAccessResolvedField(ObjPtr<Class> access_to, 555 ArtField* field, 556 ObjPtr<DexCache> dex_cache, 557 uint32_t field_idx) 558 REQUIRES_SHARED(Locks::mutator_lock_); 559 bool CheckResolvedFieldAccess(ObjPtr<Class> access_to, 560 ArtField* field, 561 ObjPtr<DexCache> dex_cache, 562 uint32_t field_idx) 563 REQUIRES_SHARED(Locks::mutator_lock_); 564 565 // Can this class access a resolved method? 566 // Note that access to methods's class is checked and this may require looking up the class 567 // referenced by the MethodId in the DexFile in case the declaring class is inaccessible. 568 bool CanAccessResolvedMethod(ObjPtr<Class> access_to, 569 ArtMethod* resolved_method, 570 ObjPtr<DexCache> dex_cache, 571 uint32_t method_idx) 572 REQUIRES_SHARED(Locks::mutator_lock_); 573 bool CheckResolvedMethodAccess(ObjPtr<Class> access_to, 574 ArtMethod* resolved_method, 575 ObjPtr<DexCache> dex_cache, 576 uint32_t method_idx, 577 InvokeType throw_invoke_type) 578 REQUIRES_SHARED(Locks::mutator_lock_); 579 580 bool IsSubClass(ObjPtr<Class> klass) REQUIRES_SHARED(Locks::mutator_lock_); 581 582 // Can src be assigned to this class? For example, String can be assigned to Object (by an 583 // upcast), however, an Object cannot be assigned to a String as a potentially exception throwing 584 // downcast would be necessary. Similarly for interfaces, a class that implements (or an interface 585 // that extends) another can be assigned to its parent, but not vice-versa. All Classes may assign 586 // to themselves. Classes for primitive types may not assign to each other. 587 ALWAYS_INLINE bool IsAssignableFrom(ObjPtr<Class> src) REQUIRES_SHARED(Locks::mutator_lock_); 588 589 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, 590 ReadBarrierOption kReadBarrierOption = kWithReadBarrier> 591 ALWAYS_INLINE ObjPtr<Class> GetSuperClass() REQUIRES_SHARED(Locks::mutator_lock_); 592 593 // Get first common super class. It will never return null. 594 // `This` and `klass` must be classes. 595 ObjPtr<Class> GetCommonSuperClass(Handle<Class> klass) REQUIRES_SHARED(Locks::mutator_lock_); 596 597 void SetSuperClass(ObjPtr<Class> new_super_class) REQUIRES_SHARED(Locks::mutator_lock_); 598 599 bool HasSuperClass() REQUIRES_SHARED(Locks::mutator_lock_); 600 601 static constexpr MemberOffset SuperClassOffset() { 602 return MemberOffset(OFFSETOF_MEMBER(Class, super_class_)); 603 } 604 605 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, 606 ReadBarrierOption kReadBarrierOption = kWithReadBarrier> 607 ObjPtr<ClassLoader> GetClassLoader() ALWAYS_INLINE REQUIRES_SHARED(Locks::mutator_lock_); 608 609 template <bool kCheckTransaction = true> 610 void SetClassLoader(ObjPtr<ClassLoader> new_cl) REQUIRES_SHARED(Locks::mutator_lock_); 611 612 static constexpr MemberOffset DexCacheOffset() { 613 return MemberOffset(OFFSETOF_MEMBER(Class, dex_cache_)); 614 } 615 616 static constexpr MemberOffset IfTableOffset() { 617 return MemberOffset(OFFSETOF_MEMBER(Class, iftable_)); 618 } 619 620 enum { 621 kDumpClassFullDetail = 1, 622 kDumpClassClassLoader = (1 << 1), 623 kDumpClassInitialized = (1 << 2), 624 }; 625 626 void DumpClass(std::ostream& os, int flags) REQUIRES_SHARED(Locks::mutator_lock_); 627 628 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, 629 ReadBarrierOption kReadBarrierOption = kWithReadBarrier> 630 ObjPtr<DexCache> GetDexCache() REQUIRES_SHARED(Locks::mutator_lock_); 631 632 // Also updates the dex_cache_strings_ variable from new_dex_cache. 633 void SetDexCache(ObjPtr<DexCache> new_dex_cache) REQUIRES_SHARED(Locks::mutator_lock_); 634 635 ALWAYS_INLINE ArraySlice<ArtMethod> GetDirectMethods(PointerSize pointer_size) 636 REQUIRES_SHARED(Locks::mutator_lock_); 637 638 ALWAYS_INLINE LengthPrefixedArray<ArtMethod>* GetMethodsPtr() 639 REQUIRES_SHARED(Locks::mutator_lock_); 640 641 static constexpr MemberOffset MethodsOffset() { 642 return MemberOffset(OFFSETOF_MEMBER(Class, methods_)); 643 } 644 645 ALWAYS_INLINE ArraySlice<ArtMethod> GetMethods(PointerSize pointer_size) 646 REQUIRES_SHARED(Locks::mutator_lock_); 647 648 void SetMethodsPtr(LengthPrefixedArray<ArtMethod>* new_methods, 649 uint32_t num_direct, 650 uint32_t num_virtual) 651 REQUIRES_SHARED(Locks::mutator_lock_); 652 // Used by image writer. 653 void SetMethodsPtrUnchecked(LengthPrefixedArray<ArtMethod>* new_methods, 654 uint32_t num_direct, 655 uint32_t num_virtual) 656 REQUIRES_SHARED(Locks::mutator_lock_); 657 658 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 659 ALWAYS_INLINE ArraySlice<ArtMethod> GetDirectMethodsSlice(PointerSize pointer_size) 660 REQUIRES_SHARED(Locks::mutator_lock_); 661 662 ALWAYS_INLINE ArtMethod* GetDirectMethod(size_t i, PointerSize pointer_size) 663 REQUIRES_SHARED(Locks::mutator_lock_); 664 665 // Use only when we are allocating populating the method arrays. 666 ALWAYS_INLINE ArtMethod* GetDirectMethodUnchecked(size_t i, PointerSize pointer_size) 667 REQUIRES_SHARED(Locks::mutator_lock_); 668 ALWAYS_INLINE ArtMethod* GetVirtualMethodUnchecked(size_t i, PointerSize pointer_size) 669 REQUIRES_SHARED(Locks::mutator_lock_); 670 671 // Returns the number of static, private, and constructor methods. 672 ALWAYS_INLINE uint32_t NumDirectMethods() REQUIRES_SHARED(Locks::mutator_lock_); 673 674 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 675 ALWAYS_INLINE ArraySlice<ArtMethod> GetMethodsSlice(PointerSize pointer_size) 676 REQUIRES_SHARED(Locks::mutator_lock_); 677 678 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 679 ALWAYS_INLINE ArraySlice<ArtMethod> GetDeclaredMethodsSlice(PointerSize pointer_size) 680 REQUIRES_SHARED(Locks::mutator_lock_); 681 682 ALWAYS_INLINE ArraySlice<ArtMethod> GetDeclaredMethods( 683 PointerSize pointer_size) 684 REQUIRES_SHARED(Locks::mutator_lock_); 685 686 template <PointerSize kPointerSize, bool kTransactionActive> 687 static ObjPtr<Method> GetDeclaredMethodInternal( 688 Thread* self, 689 ObjPtr<Class> klass, 690 ObjPtr<String> name, 691 ObjPtr<ObjectArray<Class>> args, 692 const std::function<hiddenapi::AccessContext()>& fn_get_access_context) 693 REQUIRES_SHARED(Locks::mutator_lock_); 694 695 template <PointerSize kPointerSize, bool kTransactionActive> 696 static ObjPtr<Constructor> GetDeclaredConstructorInternal(Thread* self, 697 ObjPtr<Class> klass, 698 ObjPtr<ObjectArray<Class>> args) 699 REQUIRES_SHARED(Locks::mutator_lock_); 700 701 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 702 ALWAYS_INLINE ArraySlice<ArtMethod> GetDeclaredVirtualMethodsSlice(PointerSize pointer_size) 703 REQUIRES_SHARED(Locks::mutator_lock_); 704 705 ALWAYS_INLINE ArraySlice<ArtMethod> GetDeclaredVirtualMethods( 706 PointerSize pointer_size) 707 REQUIRES_SHARED(Locks::mutator_lock_); 708 709 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 710 ALWAYS_INLINE ArraySlice<ArtMethod> GetCopiedMethodsSlice(PointerSize pointer_size) 711 REQUIRES_SHARED(Locks::mutator_lock_); 712 713 ALWAYS_INLINE ArraySlice<ArtMethod> GetCopiedMethods(PointerSize pointer_size) 714 REQUIRES_SHARED(Locks::mutator_lock_); 715 716 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 717 ALWAYS_INLINE ArraySlice<ArtMethod> GetVirtualMethodsSlice(PointerSize pointer_size) 718 REQUIRES_SHARED(Locks::mutator_lock_); 719 720 ALWAYS_INLINE ArraySlice<ArtMethod> GetVirtualMethods( 721 PointerSize pointer_size) 722 REQUIRES_SHARED(Locks::mutator_lock_); 723 724 // Returns the number of non-inherited virtual methods (sum of declared and copied methods). 725 ALWAYS_INLINE uint32_t NumVirtualMethods() REQUIRES_SHARED(Locks::mutator_lock_); 726 727 // Returns the number of copied virtual methods. 728 ALWAYS_INLINE uint32_t NumCopiedVirtualMethods() REQUIRES_SHARED(Locks::mutator_lock_); 729 730 // Returns the number of declared virtual methods. 731 ALWAYS_INLINE uint32_t NumDeclaredVirtualMethods() REQUIRES_SHARED(Locks::mutator_lock_); 732 733 ALWAYS_INLINE uint32_t NumMethods() REQUIRES_SHARED(Locks::mutator_lock_); 734 static ALWAYS_INLINE uint32_t NumMethods(LengthPrefixedArray<ArtMethod>* methods) 735 REQUIRES_SHARED(Locks::mutator_lock_); 736 737 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 738 ArtMethod* GetVirtualMethod(size_t i, PointerSize pointer_size) 739 REQUIRES_SHARED(Locks::mutator_lock_); 740 741 ArtMethod* GetVirtualMethodDuringLinking(size_t i, PointerSize pointer_size) 742 REQUIRES_SHARED(Locks::mutator_lock_); 743 744 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, 745 ReadBarrierOption kReadBarrierOption = kWithReadBarrier> 746 ALWAYS_INLINE ObjPtr<PointerArray> GetVTable() REQUIRES_SHARED(Locks::mutator_lock_); 747 748 ALWAYS_INLINE ObjPtr<PointerArray> GetVTableDuringLinking() REQUIRES_SHARED(Locks::mutator_lock_); 749 750 void SetVTable(ObjPtr<PointerArray> new_vtable) REQUIRES_SHARED(Locks::mutator_lock_); 751 752 static constexpr MemberOffset VTableOffset() { 753 return OFFSET_OF_OBJECT_MEMBER(Class, vtable_); 754 } 755 756 static constexpr MemberOffset EmbeddedVTableLengthOffset() { 757 return MemberOffset(sizeof(Class)); 758 } 759 760 static constexpr MemberOffset ImtPtrOffset(PointerSize pointer_size) { 761 return MemberOffset( 762 RoundUp(EmbeddedVTableLengthOffset().Uint32Value() + sizeof(uint32_t), 763 static_cast<size_t>(pointer_size))); 764 } 765 766 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 767 bool ShouldHaveImt() REQUIRES_SHARED(Locks::mutator_lock_); 768 769 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 770 bool ShouldHaveEmbeddedVTable() REQUIRES_SHARED(Locks::mutator_lock_); 771 772 bool HasVTable() REQUIRES_SHARED(Locks::mutator_lock_); 773 774 static MemberOffset EmbeddedVTableEntryOffset(uint32_t i, PointerSize pointer_size); 775 776 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 777 int32_t GetVTableLength() REQUIRES_SHARED(Locks::mutator_lock_); 778 779 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, 780 ReadBarrierOption kReadBarrierOption = kWithReadBarrier> 781 ArtMethod* GetVTableEntry(uint32_t i, PointerSize pointer_size) 782 REQUIRES_SHARED(Locks::mutator_lock_); 783 784 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 785 int32_t GetEmbeddedVTableLength() REQUIRES_SHARED(Locks::mutator_lock_); 786 787 void SetEmbeddedVTableLength(int32_t len) REQUIRES_SHARED(Locks::mutator_lock_); 788 789 ImTable* GetImt(PointerSize pointer_size) REQUIRES_SHARED(Locks::mutator_lock_); 790 791 void SetImt(ImTable* imt, PointerSize pointer_size) REQUIRES_SHARED(Locks::mutator_lock_); 792 793 ArtMethod* GetEmbeddedVTableEntry(uint32_t i, PointerSize pointer_size) 794 REQUIRES_SHARED(Locks::mutator_lock_); 795 796 void SetEmbeddedVTableEntry(uint32_t i, ArtMethod* method, PointerSize pointer_size) 797 REQUIRES_SHARED(Locks::mutator_lock_); 798 799 inline void SetEmbeddedVTableEntryUnchecked(uint32_t i, 800 ArtMethod* method, 801 PointerSize pointer_size) 802 REQUIRES_SHARED(Locks::mutator_lock_); 803 804 void PopulateEmbeddedVTable(PointerSize pointer_size) 805 REQUIRES_SHARED(Locks::mutator_lock_); 806 807 // Given a method implemented by this class but potentially from a super class, return the 808 // specific implementation method for this class. 809 ArtMethod* FindVirtualMethodForVirtual(ArtMethod* method, PointerSize pointer_size) 810 REQUIRES_SHARED(Locks::mutator_lock_); 811 812 // Given a method implemented by this class' super class, return the specific implementation 813 // method for this class. 814 ArtMethod* FindVirtualMethodForSuper(ArtMethod* method, PointerSize pointer_size) 815 REQUIRES_SHARED(Locks::mutator_lock_); 816 817 // Given a method from some implementor of this interface, return the specific implementation 818 // method for this class. 819 ArtMethod* FindVirtualMethodForInterfaceSuper(ArtMethod* method, PointerSize pointer_size) 820 REQUIRES_SHARED(Locks::mutator_lock_); 821 822 // Given a method implemented by this class, but potentially from a 823 // super class or interface, return the specific implementation 824 // method for this class. 825 ArtMethod* FindVirtualMethodForInterface(ArtMethod* method, PointerSize pointer_size) 826 REQUIRES_SHARED(Locks::mutator_lock_) ALWAYS_INLINE; 827 828 ArtMethod* FindVirtualMethodForVirtualOrInterface(ArtMethod* method, PointerSize pointer_size) 829 REQUIRES_SHARED(Locks::mutator_lock_); 830 831 // Find a method with the given name and signature in an interface class. 832 // 833 // Search for the method declared in the class, then search for a method declared in any 834 // superinterface, then search the superclass java.lang.Object (implicitly declared methods 835 // in an interface without superinterfaces, see JLS 9.2, can be inherited, see JLS 9.4.1). 836 // TODO: Implement search for a unique maximally-specific non-abstract superinterface method. 837 838 ArtMethod* FindInterfaceMethod(std::string_view name, 839 std::string_view signature, 840 PointerSize pointer_size) 841 REQUIRES_SHARED(Locks::mutator_lock_); 842 843 ArtMethod* FindInterfaceMethod(std::string_view name, 844 const Signature& signature, 845 PointerSize pointer_size) 846 REQUIRES_SHARED(Locks::mutator_lock_); 847 848 ArtMethod* FindInterfaceMethod(ObjPtr<DexCache> dex_cache, 849 uint32_t dex_method_idx, 850 PointerSize pointer_size) 851 REQUIRES_SHARED(Locks::mutator_lock_); 852 853 // Find a method with the given name and signature in a non-interface class. 854 // 855 // Search for the method in the class, following the JLS rules which conflict with the RI 856 // in some cases. The JLS says that inherited methods are searched (JLS 15.12.2.1) and 857 // these can come from a superclass or a superinterface (JLS 8.4.8). We perform the 858 // following search: 859 // 1. Search the methods declared directly in the class. If we find a method with the 860 // given name and signature, return that method. 861 // 2. Search the methods declared in superclasses until we find a method with the given 862 // signature or complete the search in java.lang.Object. If we find a method with the 863 // given name and signature, check if it's been inherited by the class where we're 864 // performing the lookup (qualifying type). If it's inherited, return it. Otherwise, 865 // just remember the method and its declaring class and proceed to step 3. 866 // 3. Search "copied" methods (containing methods inherited from interfaces) in the class 867 // and its superclass chain. If we found a method in step 2 (which was not inherited, 868 // otherwise we would not be performing step 3), end the search when we reach its 869 // declaring class, otherwise search the entire superclass chain. If we find a method 870 // with the given name and signature, return that method. 871 // 4. Return the method found in step 2 if any (not inherited), or null. 872 // 873 // It's the responsibility of the caller to throw exceptions if the returned method (or null) 874 // does not satisfy the request. Special consideration should be given to the case where this 875 // function returns a method that's not inherited (found in step 2, returned in step 4). 876 877 ArtMethod* FindClassMethod(std::string_view name, 878 std::string_view signature, 879 PointerSize pointer_size) 880 REQUIRES_SHARED(Locks::mutator_lock_); 881 882 ArtMethod* FindClassMethod(std::string_view name, 883 const Signature& signature, 884 PointerSize pointer_size) 885 REQUIRES_SHARED(Locks::mutator_lock_); 886 887 ArtMethod* FindClassMethod(ObjPtr<DexCache> dex_cache, 888 uint32_t dex_method_idx, 889 PointerSize pointer_size) 890 REQUIRES_SHARED(Locks::mutator_lock_); 891 892 ArtMethod* FindConstructor(std::string_view signature, PointerSize pointer_size) 893 REQUIRES_SHARED(Locks::mutator_lock_); 894 895 ArtMethod* FindDeclaredVirtualMethodByName(std::string_view name, PointerSize pointer_size) 896 REQUIRES_SHARED(Locks::mutator_lock_); 897 898 ArtMethod* FindDeclaredDirectMethodByName(std::string_view name, PointerSize pointer_size) 899 REQUIRES_SHARED(Locks::mutator_lock_); 900 901 ArtMethod* FindClassInitializer(PointerSize pointer_size) REQUIRES_SHARED(Locks::mutator_lock_); 902 903 bool HasDefaultMethods() REQUIRES_SHARED(Locks::mutator_lock_) { 904 return (GetAccessFlags() & kAccHasDefaultMethod) != 0; 905 } 906 907 bool HasBeenRecursivelyInitialized() REQUIRES_SHARED(Locks::mutator_lock_) { 908 return (GetAccessFlags() & kAccRecursivelyInitialized) != 0; 909 } 910 911 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 912 ALWAYS_INLINE int32_t GetIfTableCount() REQUIRES_SHARED(Locks::mutator_lock_); 913 914 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, 915 ReadBarrierOption kReadBarrierOption = kWithReadBarrier> 916 ALWAYS_INLINE ObjPtr<IfTable> GetIfTable() REQUIRES_SHARED(Locks::mutator_lock_); 917 918 ALWAYS_INLINE void SetIfTable(ObjPtr<IfTable> new_iftable) 919 REQUIRES_SHARED(Locks::mutator_lock_); 920 921 // Get instance fields of the class (See also GetSFields). 922 LengthPrefixedArray<ArtField>* GetIFieldsPtr() REQUIRES_SHARED(Locks::mutator_lock_); 923 924 ALWAYS_INLINE IterationRange<StrideIterator<ArtField>> GetIFields() 925 REQUIRES_SHARED(Locks::mutator_lock_); 926 927 void SetIFieldsPtr(LengthPrefixedArray<ArtField>* new_ifields) 928 REQUIRES_SHARED(Locks::mutator_lock_); 929 930 // Unchecked edition has no verification flags. 931 void SetIFieldsPtrUnchecked(LengthPrefixedArray<ArtField>* new_sfields) 932 REQUIRES_SHARED(Locks::mutator_lock_); 933 934 uint32_t NumInstanceFields() REQUIRES_SHARED(Locks::mutator_lock_); 935 ArtField* GetInstanceField(uint32_t i) REQUIRES_SHARED(Locks::mutator_lock_); 936 937 // Returns the number of instance fields containing reference types. Does not count fields in any 938 // super classes. 939 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 940 uint32_t NumReferenceInstanceFields() REQUIRES_SHARED(Locks::mutator_lock_) { 941 DCHECK(IsResolved<kVerifyFlags>()); 942 return GetField32<kVerifyFlags>(OFFSET_OF_OBJECT_MEMBER(Class, num_reference_instance_fields_)); 943 } 944 945 uint32_t NumReferenceInstanceFieldsDuringLinking() REQUIRES_SHARED(Locks::mutator_lock_) { 946 DCHECK(IsLoaded() || IsErroneous()); 947 return GetField32(OFFSET_OF_OBJECT_MEMBER(Class, num_reference_instance_fields_)); 948 } 949 950 void SetNumReferenceInstanceFields(uint32_t new_num) REQUIRES_SHARED(Locks::mutator_lock_) { 951 // Not called within a transaction. 952 SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, num_reference_instance_fields_), new_num); 953 } 954 955 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 956 uint32_t GetReferenceInstanceOffsets() ALWAYS_INLINE REQUIRES_SHARED(Locks::mutator_lock_); 957 958 void SetReferenceInstanceOffsets(uint32_t new_reference_offsets) 959 REQUIRES_SHARED(Locks::mutator_lock_); 960 961 // Get the offset of the first reference instance field. Other reference instance fields follow. 962 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, 963 ReadBarrierOption kReadBarrierOption = kWithReadBarrier> 964 MemberOffset GetFirstReferenceInstanceFieldOffset() 965 REQUIRES_SHARED(Locks::mutator_lock_); 966 967 // Returns the number of static fields containing reference types. 968 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 969 uint32_t NumReferenceStaticFields() REQUIRES_SHARED(Locks::mutator_lock_) { 970 DCHECK(IsResolved<kVerifyFlags>()); 971 return GetField32<kVerifyFlags>(OFFSET_OF_OBJECT_MEMBER(Class, num_reference_static_fields_)); 972 } 973 974 uint32_t NumReferenceStaticFieldsDuringLinking() REQUIRES_SHARED(Locks::mutator_lock_) { 975 DCHECK(IsLoaded() || IsErroneous() || IsRetired()); 976 return GetField32(OFFSET_OF_OBJECT_MEMBER(Class, num_reference_static_fields_)); 977 } 978 979 void SetNumReferenceStaticFields(uint32_t new_num) REQUIRES_SHARED(Locks::mutator_lock_) { 980 // Not called within a transaction. 981 SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, num_reference_static_fields_), new_num); 982 } 983 984 // Get the offset of the first reference static field. Other reference static fields follow. 985 template <VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags> 986 MemberOffset GetFirstReferenceStaticFieldOffset(PointerSize pointer_size) 987 REQUIRES_SHARED(Locks::mutator_lock_); 988 989 // Get the offset of the first reference static field. Other reference static fields follow. 990 MemberOffset GetFirstReferenceStaticFieldOffsetDuringLinking(PointerSize pointer_size) 991 REQUIRES_SHARED(Locks::mutator_lock_); 992 993 // Gets the static fields of the class. 994 LengthPrefixedArray<ArtField>* GetSFieldsPtr() REQUIRES_SHARED(Locks::mutator_lock_); 995 ALWAYS_INLINE IterationRange<StrideIterator<ArtField>> GetSFields() 996 REQUIRES_SHARED(Locks::mutator_lock_); 997 998 void SetSFieldsPtr(LengthPrefixedArray<ArtField>* new_sfields) 999 REQUIRES_SHARED(Locks::mutator_lock_); 1000 1001 // Unchecked edition has no verification flags. 1002 void SetSFieldsPtrUnchecked(LengthPrefixedArray<ArtField>* new_sfields) 1003 REQUIRES_SHARED(Locks::mutator_lock_); 1004 1005 uint32_t NumStaticFields() REQUIRES_SHARED(Locks::mutator_lock_); 1006 1007 // TODO: uint16_t 1008 ArtField* GetStaticField(uint32_t i) REQUIRES_SHARED(Locks::mutator_lock_); 1009 1010 // Find a static or instance field using the JLS resolution order 1011 static ArtField* FindField(Thread* self, 1012 ObjPtr<Class> klass, 1013 std::string_view name, 1014 std::string_view type) 1015 REQUIRES_SHARED(Locks::mutator_lock_); 1016 1017 // Finds the given instance field in this class or a superclass. 1018 ArtField* FindInstanceField(std::string_view name, std::string_view type) 1019 REQUIRES_SHARED(Locks::mutator_lock_); 1020 1021 // Finds the given instance field in this class or a superclass, only searches classes that 1022 // have the same dex cache. 1023 ArtField* FindInstanceField(ObjPtr<DexCache> dex_cache, uint32_t dex_field_idx) 1024 REQUIRES_SHARED(Locks::mutator_lock_); 1025 1026 ArtField* FindDeclaredInstanceField(std::string_view name, std::string_view type) 1027 REQUIRES_SHARED(Locks::mutator_lock_); 1028 1029 ArtField* FindDeclaredInstanceField(ObjPtr<DexCache> dex_cache, uint32_t dex_field_idx) 1030 REQUIRES_SHARED(Locks::mutator_lock_); 1031 1032 // Finds the given static field in this class or a superclass. 1033 static ArtField* FindStaticField(Thread* self, 1034 ObjPtr<Class> klass, 1035 std::string_view name, 1036 std::string_view type) 1037 REQUIRES_SHARED(Locks::mutator_lock_); 1038 1039 // Finds the given static field in this class or superclass, only searches classes that 1040 // have the same dex cache. 1041 static ArtField* FindStaticField(Thread* self, 1042 ObjPtr<Class> klass, 1043 ObjPtr<DexCache> dex_cache, 1044 uint32_t dex_field_idx) 1045 REQUIRES_SHARED(Locks::mutator_lock_); 1046 1047 ArtField* FindDeclaredStaticField(std::string_view name, std::string_view type) 1048 REQUIRES_SHARED(Locks::mutator_lock_); 1049 1050 ArtField* FindDeclaredStaticField(ObjPtr<DexCache> dex_cache, uint32_t dex_field_idx) 1051 REQUIRES_SHARED(Locks::mutator_lock_); 1052 1053 pid_t GetClinitThreadId() REQUIRES_SHARED(Locks::mutator_lock_) { 1054 DCHECK(IsIdxLoaded() || IsErroneous()) << PrettyClass(); 1055 return GetField32(OFFSET_OF_OBJECT_MEMBER(Class, clinit_thread_id_)); 1056 } 1057 1058 void SetClinitThreadId(pid_t new_clinit_thread_id) REQUIRES_SHARED(Locks::mutator_lock_); 1059 1060 template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, 1061 ReadBarrierOption kReadBarrierOption = kWithReadBarrier> 1062 ObjPtr<ClassExt> GetExtData() REQUIRES_SHARED(Locks::mutator_lock_); 1063 1064 // Returns the ExtData for this class, allocating one if necessary. This should be the only way 1065 // to force ext_data_ to be set. No functions are available for changing an already set ext_data_ 1066 // since doing so is not allowed. 1067 ObjPtr<ClassExt> EnsureExtDataPresent(Thread* self) 1068 REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!Roles::uninterruptible_); 1069 1070 uint16_t GetDexClassDefIndex() REQUIRES_SHARED(Locks::mutator_lock_) { 1071 return GetField32(OFFSET_OF_OBJECT_MEMBER(Class, dex_class_def_idx_)); 1072 } 1073 1074 void SetDexClassDefIndex(uint16_t class_def_idx) REQUIRES_SHARED(Locks::mutator_lock_) { 1075 SetField32Transaction(OFFSET_OF_OBJECT_MEMBER(Class, dex_class_def_idx_), class_def_idx); 1076 } 1077 1078 dex::TypeIndex GetDexTypeIndex() REQUIRES_SHARED(Locks::mutator_lock_) { 1079 return dex::TypeIndex( 1080 static_cast<uint16_t>(GetField32(OFFSET_OF_OBJECT_MEMBER(Class, dex_type_idx_)))); 1081 } 1082 1083 void SetDexTypeIndex(dex::TypeIndex type_idx) REQUIRES_SHARED(Locks::mutator_lock_) { 1084 SetField32Transaction(OFFSET_OF_OBJECT_MEMBER(Class, dex_type_idx_), type_idx.index_); 1085 } 1086 1087 dex::TypeIndex FindTypeIndexInOtherDexFile(const DexFile& dex_file) 1088 REQUIRES_SHARED(Locks::mutator_lock_); 1089 1090 // Visit native roots visits roots which are keyed off the native pointers such as ArtFields and 1091 // ArtMethods. 1092 template<ReadBarrierOption kReadBarrierOption = kWithReadBarrier, class Visitor> 1093 void VisitNativeRoots(Visitor& visitor, PointerSize pointer_size) 1094 REQUIRES_SHARED(Locks::mutator_lock_); 1095 1096 // Get one of the primitive classes. 1097 static ObjPtr<mirror::Class> GetPrimitiveClass(ObjPtr<mirror::String> name) 1098 REQUIRES_SHARED(Locks::mutator_lock_); 1099 1100 // When class is verified, set the kAccSkipAccessChecks flag on each method. 1101 void SetSkipAccessChecksFlagOnAllMethods(PointerSize pointer_size) 1102 REQUIRES_SHARED(Locks::mutator_lock_); 1103 1104 // Get the descriptor of the class. In a few cases a std::string is required, rather than 1105 // always create one the storage argument is populated and its internal c_str() returned. We do 1106 // this to avoid memory allocation in the common case. 1107 const char* GetDescriptor(std::string* storage) REQUIRES_SHARED(Locks::mutator_lock_); 1108 1109 bool DescriptorEquals(const char* match) REQUIRES_SHARED(Locks::mutator_lock_); 1110 1111 const dex::ClassDef* GetClassDef() REQUIRES_SHARED(Locks::mutator_lock_); 1112 1113 ALWAYS_INLINE uint32_t NumDirectInterfaces() REQUIRES_SHARED(Locks::mutator_lock_); 1114 1115 dex::TypeIndex GetDirectInterfaceTypeIdx(uint32_t idx) REQUIRES_SHARED(Locks::mutator_lock_); 1116 1117 // Get the direct interface of the `klass` at index `idx` if resolved, otherwise return null. 1118 // If the caller expects the interface to be resolved, for example for a resolved `klass`, 1119 // that assumption should be checked by `DCHECK(result != nullptr)`. 1120 static ObjPtr<Class> GetDirectInterface(Thread* self, ObjPtr<Class> klass, uint32_t idx) 1121 REQUIRES_SHARED(Locks::mutator_lock_); 1122 1123 // Resolve and get the direct interface of the `klass` at index `idx`. 1124 // Returns null with a pending exception if the resolution fails. 1125 static ObjPtr<Class> ResolveDirectInterface(Thread* self, Handle<Class> klass, uint32_t idx) 1126 REQUIRES_SHARED(Locks::mutator_lock_); 1127 1128 const char* GetSourceFile() REQUIRES_SHARED(Locks::mutator_lock_); 1129 1130 std::string GetLocation() REQUIRES_SHARED(Locks::mutator_lock_); 1131 1132 const DexFile& GetDexFile() REQUIRES_SHARED(Locks::mutator_lock_); 1133 1134 const dex::TypeList* GetInterfaceTypeList() REQUIRES_SHARED(Locks::mutator_lock_); 1135 1136 // Asserts we are initialized or initializing in the given thread. 1137 void AssertInitializedOrInitializingInThread(Thread* self) 1138 REQUIRES_SHARED(Locks::mutator_lock_); 1139 1140 ObjPtr<Class> CopyOf(Thread* self, int32_t new_length, ImTable* imt, PointerSize pointer_size) 1141 REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!Roles::uninterruptible_); 1142 1143 // For proxy class only. 1144 ObjPtr<ObjectArray<Class>> GetProxyInterfaces() REQUIRES_SHARED(Locks::mutator_lock_); 1145 1146 // For proxy class only. 1147 ObjPtr<ObjectArray<ObjectArray<Class>>> GetProxyThrows() REQUIRES_SHARED(Locks::mutator_lock_); 1148 1149 // May cause thread suspension due to EqualParameters. 1150 ArtMethod* GetDeclaredConstructor(Thread* self, 1151 Handle<ObjectArray<Class>> args, 1152 PointerSize pointer_size) 1153 REQUIRES_SHARED(Locks::mutator_lock_); 1154 1155 static int32_t GetInnerClassFlags(Handle<Class> h_this, int32_t default_value) 1156 REQUIRES_SHARED(Locks::mutator_lock_); 1157 1158 // Used to initialize a class in the allocation code path to ensure it is guarded by a StoreStore 1159 // fence. 1160 class InitializeClassVisitor { 1161 public: 1162 explicit InitializeClassVisitor(uint32_t class_size) : class_size_(class_size) { 1163 } 1164 1165 void operator()(ObjPtr<Object> obj, size_t usable_size) const 1166 REQUIRES_SHARED(Locks::mutator_lock_); 1167 1168 private: 1169 const uint32_t class_size_; 1170 1171 DISALLOW_COPY_AND_ASSIGN(InitializeClassVisitor); 1172 }; 1173 1174 // Returns true if the class loader is null, ie the class loader is the boot strap class loader. 1175 bool IsBootStrapClassLoaded() REQUIRES_SHARED(Locks::mutator_lock_); 1176 1177 static size_t ImTableEntrySize(PointerSize pointer_size) { 1178 return static_cast<size_t>(pointer_size); 1179 } 1180 1181 static size_t VTableEntrySize(PointerSize pointer_size) { 1182 return static_cast<size_t>(pointer_size); 1183 } 1184 1185 ALWAYS_INLINE ArraySlice<ArtMethod> GetDirectMethodsSliceUnchecked(PointerSize pointer_size) 1186 REQUIRES_SHARED(Locks::mutator_lock_); 1187 1188 ALWAYS_INLINE ArraySlice<ArtMethod> GetVirtualMethodsSliceUnchecked(PointerSize pointer_size) 1189 REQUIRES_SHARED(Locks::mutator_lock_); 1190 1191 ALWAYS_INLINE ArraySlice<ArtMethod> GetDeclaredMethodsSliceUnchecked(PointerSize pointer_size) 1192 REQUIRES_SHARED(Locks::mutator_lock_); 1193 1194 ALWAYS_INLINE ArraySlice<ArtMethod> GetDeclaredVirtualMethodsSliceUnchecked( 1195 PointerSize pointer_size) 1196 REQUIRES_SHARED(Locks::mutator_lock_); 1197 1198 ALWAYS_INLINE ArraySlice<ArtMethod> GetCopiedMethodsSliceUnchecked(PointerSize pointer_size) 1199 REQUIRES_SHARED(Locks::mutator_lock_); 1200 1201 static std::string PrettyDescriptor(ObjPtr<mirror::Class> klass) 1202 REQUIRES_SHARED(Locks::mutator_lock_); 1203 std::string PrettyDescriptor() 1204 REQUIRES_SHARED(Locks::mutator_lock_); 1205 // Returns a human-readable form of the name of the given class. 1206 // Given String.class, the output would be "java.lang.Class<java.lang.String>". 1207 static std::string PrettyClass(ObjPtr<mirror::Class> c) 1208 REQUIRES_SHARED(Locks::mutator_lock_); 1209 std::string PrettyClass() 1210 REQUIRES_SHARED(Locks::mutator_lock_); 1211 // Returns a human-readable form of the name of the given class with its class loader. 1212 static std::string PrettyClassAndClassLoader(ObjPtr<mirror::Class> c) 1213 REQUIRES_SHARED(Locks::mutator_lock_); 1214 std::string PrettyClassAndClassLoader() 1215 REQUIRES_SHARED(Locks::mutator_lock_); 1216 1217 // Fix up all of the native pointers in the class by running them through the visitor. Only sets 1218 // the corresponding entry in dest if visitor(obj) != obj to prevent dirty memory. Dest should be 1219 // initialized to a copy of *this to prevent issues. Does not visit the ArtMethod and ArtField 1220 // roots. 1221 template <VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, typename Visitor> 1222 void FixupNativePointers(Class* dest, PointerSize pointer_size, const Visitor& visitor) 1223 REQUIRES_SHARED(Locks::mutator_lock_); 1224 1225 private: 1226 template <typename T, VerifyObjectFlags kVerifyFlags, typename Visitor> 1227 void FixupNativePointer( 1228 Class* dest, PointerSize pointer_size, const Visitor& visitor, MemberOffset member_offset) 1229 REQUIRES_SHARED(Locks::mutator_lock_); 1230 1231 ALWAYS_INLINE static ArraySlice<ArtMethod> GetMethodsSliceRangeUnchecked( 1232 LengthPrefixedArray<ArtMethod>* methods, 1233 PointerSize pointer_size, 1234 uint32_t start_offset, 1235 uint32_t end_offset) 1236 REQUIRES_SHARED(Locks::mutator_lock_); 1237 1238 template <bool throw_on_failure> 1239 bool ResolvedFieldAccessTest(ObjPtr<Class> access_to, 1240 ArtField* field, 1241 ObjPtr<DexCache> dex_cache, 1242 uint32_t field_idx) 1243 REQUIRES_SHARED(Locks::mutator_lock_); 1244 1245 template <bool throw_on_failure> 1246 bool ResolvedMethodAccessTest(ObjPtr<Class> access_to, 1247 ArtMethod* resolved_method, 1248 ObjPtr<DexCache> dex_cache, 1249 uint32_t method_idx, 1250 InvokeType throw_invoke_type) 1251 REQUIRES_SHARED(Locks::mutator_lock_); 1252 1253 bool Implements(ObjPtr<Class> klass) REQUIRES_SHARED(Locks::mutator_lock_); 1254 bool IsArrayAssignableFromArray(ObjPtr<Class> klass) REQUIRES_SHARED(Locks::mutator_lock_); 1255 bool IsAssignableFromArray(ObjPtr<Class> klass) REQUIRES_SHARED(Locks::mutator_lock_); 1256 1257 void CheckObjectAlloc() REQUIRES_SHARED(Locks::mutator_lock_); 1258 1259 // Unchecked editions is for root visiting. 1260 LengthPrefixedArray<ArtField>* GetSFieldsPtrUnchecked() REQUIRES_SHARED(Locks::mutator_lock_); 1261 IterationRange<StrideIterator<ArtField>> GetSFieldsUnchecked() 1262 REQUIRES_SHARED(Locks::mutator_lock_); 1263 LengthPrefixedArray<ArtField>* GetIFieldsPtrUnchecked() REQUIRES_SHARED(Locks::mutator_lock_); 1264 IterationRange<StrideIterator<ArtField>> GetIFieldsUnchecked() 1265 REQUIRES_SHARED(Locks::mutator_lock_); 1266 1267 // The index in the methods_ array where the first declared virtual method is. 1268 ALWAYS_INLINE uint32_t GetVirtualMethodsStartOffset() REQUIRES_SHARED(Locks::mutator_lock_); 1269 1270 // The index in the methods_ array where the first direct method is. 1271 ALWAYS_INLINE uint32_t GetDirectMethodsStartOffset() REQUIRES_SHARED(Locks::mutator_lock_); 1272 1273 // The index in the methods_ array where the first copied method is. 1274 ALWAYS_INLINE uint32_t GetCopiedMethodsStartOffset() REQUIRES_SHARED(Locks::mutator_lock_); 1275 1276 bool ProxyDescriptorEquals(const char* match) REQUIRES_SHARED(Locks::mutator_lock_); 1277 1278 template<VerifyObjectFlags kVerifyFlags> 1279 void GetAccessFlagsDCheck() REQUIRES_SHARED(Locks::mutator_lock_); 1280 1281 void SetAccessFlagsDCheck(uint32_t new_access_flags) REQUIRES_SHARED(Locks::mutator_lock_); 1282 1283 // Check that the pointer size matches the one in the class linker. 1284 ALWAYS_INLINE static void CheckPointerSize(PointerSize pointer_size); 1285 1286 static MemberOffset EmbeddedVTableOffset(PointerSize pointer_size); 1287 template <bool kVisitNativeRoots, 1288 VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags, 1289 ReadBarrierOption kReadBarrierOption = kWithReadBarrier, 1290 typename Visitor> 1291 void VisitReferences(ObjPtr<Class> klass, const Visitor& visitor) 1292 REQUIRES_SHARED(Locks::mutator_lock_); 1293 1294 // 'Class' Object Fields 1295 // Order governed by java field ordering. See art::ClassLinker::LinkFields. 1296 1297 // Defining class loader, or null for the "bootstrap" system loader. 1298 HeapReference<ClassLoader> class_loader_; 1299 1300 // For array classes, the component class object for instanceof/checkcast 1301 // (for String[][][], this will be String[][]). null for non-array classes. 1302 HeapReference<Class> component_type_; 1303 1304 // DexCache of resolved constant pool entries (will be null for classes generated by the 1305 // runtime such as arrays and primitive classes). 1306 HeapReference<DexCache> dex_cache_; 1307 1308 // Extraneous class data that is not always needed. This field is allocated lazily and may 1309 // only be set with 'this' locked. This is synchronized on 'this'. 1310 // TODO(allight) We should probably synchronize it on something external or handle allocation in 1311 // some other (safe) way to prevent possible deadlocks. 1312 HeapReference<ClassExt> ext_data_; 1313 1314 // The interface table (iftable_) contains pairs of a interface class and an array of the 1315 // interface methods. There is one pair per interface supported by this class. That means one 1316 // pair for each interface we support directly, indirectly via superclass, or indirectly via a 1317 // superinterface. This will be null if neither we nor our superclass implement any interfaces. 1318 // 1319 // Why we need this: given "class Foo implements Face", declare "Face faceObj = new Foo()". 1320 // Invoke faceObj.blah(), where "blah" is part of the Face interface. We can't easily use a 1321 // single vtable. 1322 // 1323 // For every interface a concrete class implements, we create an array of the concrete vtable_ 1324 // methods for the methods in the interface. 1325 HeapReference<IfTable> iftable_; 1326 1327 // Descriptor for the class such as "java.lang.Class" or "[C". Lazily initialized by ComputeName 1328 HeapReference<String> name_; 1329 1330 // The superclass, or null if this is java.lang.Object or a primitive type. 1331 // 1332 // Note that interfaces have java.lang.Object as their 1333 // superclass. This doesn't match the expectations in JNI 1334 // GetSuperClass or java.lang.Class.getSuperClass() which need to 1335 // check for interfaces and return null. 1336 HeapReference<Class> super_class_; 1337 1338 // Virtual method table (vtable), for use by "invoke-virtual". The vtable from the superclass is 1339 // copied in, and virtual methods from our class either replace those from the super or are 1340 // appended. For abstract classes, methods may be created in the vtable that aren't in 1341 // virtual_ methods_ for miranda methods. 1342 HeapReference<PointerArray> vtable_; 1343 1344 // instance fields 1345 // 1346 // These describe the layout of the contents of an Object. 1347 // Note that only the fields directly declared by this class are 1348 // listed in ifields; fields declared by a superclass are listed in 1349 // the superclass's Class.ifields. 1350 // 1351 // ArtFields are allocated as a length prefixed ArtField array, and not an array of pointers to 1352 // ArtFields. 1353 uint64_t ifields_; 1354 1355 // Pointer to an ArtMethod length-prefixed array. All the methods where this class is the place 1356 // where they are logically defined. This includes all private, static, final and virtual methods 1357 // as well as inherited default methods and miranda methods. 1358 // 1359 // The slice methods_ [0, virtual_methods_offset_) are the direct (static, private, init) methods 1360 // declared by this class. 1361 // 1362 // The slice methods_ [virtual_methods_offset_, copied_methods_offset_) are the virtual methods 1363 // declared by this class. 1364 // 1365 // The slice methods_ [copied_methods_offset_, |methods_|) are the methods that are copied from 1366 // interfaces such as miranda or default methods. These are copied for resolution purposes as this 1367 // class is where they are (logically) declared as far as the virtual dispatch is concerned. 1368 // 1369 // Note that this field is used by the native debugger as the unique identifier for the type. 1370 uint64_t methods_; 1371 1372 // Static fields length-prefixed array. 1373 uint64_t sfields_; 1374 1375 // Access flags; low 16 bits are defined by VM spec. 1376 uint32_t access_flags_; 1377 1378 // Class flags to help speed up visiting object references. 1379 uint32_t class_flags_; 1380 1381 // Total size of the Class instance; used when allocating storage on gc heap. 1382 // See also object_size_. 1383 uint32_t class_size_; 1384 1385 // Tid used to check for recursive <clinit> invocation. 1386 pid_t clinit_thread_id_; 1387 static_assert(sizeof(pid_t) == sizeof(int32_t), "java.lang.Class.clinitThreadId size check"); 1388 1389 // ClassDef index in dex file, -1 if no class definition such as an array. 1390 // TODO: really 16bits 1391 int32_t dex_class_def_idx_; 1392 1393 // Type index in dex file. 1394 // TODO: really 16bits 1395 int32_t dex_type_idx_; 1396 1397 // Number of instance fields that are object refs. 1398 uint32_t num_reference_instance_fields_; 1399 1400 // Number of static fields that are object refs, 1401 uint32_t num_reference_static_fields_; 1402 1403 // Total object size; used when allocating storage on gc heap. 1404 // (For interfaces and abstract classes this will be zero.) 1405 // See also class_size_. 1406 uint32_t object_size_; 1407 1408 // Aligned object size for allocation fast path. The value is max uint32_t if the object is 1409 // uninitialized or finalizable. Not currently used for variable sized objects. 1410 uint32_t object_size_alloc_fast_path_; 1411 1412 // The lower 16 bits contains a Primitive::Type value. The upper 16 1413 // bits contains the size shift of the primitive type. 1414 uint32_t primitive_type_; 1415 1416 // Bitmap of offsets of ifields. 1417 uint32_t reference_instance_offsets_; 1418 1419 // See the real definition in subtype_check_bits_and_status.h 1420 // typeof(status_) is actually SubtypeCheckBitsAndStatus. 1421 uint32_t status_; 1422 1423 // The offset of the first virtual method that is copied from an interface. This includes miranda, 1424 // default, and default-conflict methods. Having a hard limit of ((2 << 16) - 1) for methods 1425 // defined on a single class is well established in Java so we will use only uint16_t's here. 1426 uint16_t copied_methods_offset_; 1427 1428 // The offset of the first declared virtual methods in the methods_ array. 1429 uint16_t virtual_methods_offset_; 1430 1431 // TODO: ? 1432 // initiating class loader list 1433 // NOTE: for classes with low serialNumber, these are unused, and the 1434 // values are kept in a table in gDvm. 1435 // InitiatingLoaderList initiating_loader_list_; 1436 1437 // The following data exist in real class objects. 1438 // Embedded Imtable, for class object that's not an interface, fixed size. 1439 // ImTableEntry embedded_imtable_[0]; 1440 // Embedded Vtable, for class object that's not an interface, variable size. 1441 // VTableEntry embedded_vtable_[0]; 1442 // Static fields, variable size. 1443 // uint32_t fields_[0]; 1444 1445 ART_FRIEND_TEST(DexCacheTest, TestResolvedFieldAccess); // For ResolvedFieldAccessTest 1446 friend struct art::ClassOffsets; // for verifying offset information 1447 friend class Object; // For VisitReferences 1448 DISALLOW_IMPLICIT_CONSTRUCTORS(Class); 1449 }; 1450 1451 } // namespace mirror 1452 } // namespace art 1453 1454 #endif // ART_RUNTIME_MIRROR_CLASS_H_ 1455
