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_CLASS_LINKER_H_ 18 #define ART_RUNTIME_CLASS_LINKER_H_ 19 20 #include <set> 21 #include <string> 22 #include <unordered_map> 23 #include <unordered_set> 24 #include <utility> 25 #include <vector> 26 27 #include "base/allocator.h" 28 #include "base/hash_set.h" 29 #include "base/macros.h" 30 #include "base/mutex.h" 31 #include "class_table.h" 32 #include "dex_cache_resolved_classes.h" 33 #include "dex_file.h" 34 #include "gc_root.h" 35 #include "jni.h" 36 #include "oat_file.h" 37 #include "object_callbacks.h" 38 39 namespace art { 40 41 namespace gc { 42 namespace space { 43 class ImageSpace; 44 } // namespace space 45 } // namespace gc 46 namespace mirror { 47 class ClassLoader; 48 class DexCache; 49 class DexCachePointerArray; 50 class DexCacheTest_Open_Test; 51 class IfTable; 52 template<class T> class ObjectArray; 53 class StackTraceElement; 54 } // namespace mirror 55 56 class ImtConflictTable; 57 template<class T> class Handle; 58 template<class T> class MutableHandle; 59 class InternTable; 60 template<class T> class ObjectLock; 61 class Runtime; 62 class ScopedObjectAccessAlreadyRunnable; 63 template<size_t kNumReferences> class PACKED(4) StackHandleScope; 64 65 enum VisitRootFlags : uint8_t; 66 67 class ClassVisitor { 68 public: 69 virtual ~ClassVisitor() {} 70 // Return true to continue visiting. 71 virtual bool operator()(mirror::Class* klass) = 0; 72 }; 73 74 class ClassLoaderVisitor { 75 public: 76 virtual ~ClassLoaderVisitor() {} 77 virtual void Visit(mirror::ClassLoader* class_loader) 78 SHARED_REQUIRES(Locks::classlinker_classes_lock_, Locks::mutator_lock_) = 0; 79 }; 80 81 class ClassLinker { 82 public: 83 // Well known mirror::Class roots accessed via GetClassRoot. 84 enum ClassRoot { 85 kJavaLangClass, 86 kJavaLangObject, 87 kClassArrayClass, 88 kObjectArrayClass, 89 kJavaLangString, 90 kJavaLangDexCache, 91 kJavaLangRefReference, 92 kJavaLangReflectConstructor, 93 kJavaLangReflectField, 94 kJavaLangReflectMethod, 95 kJavaLangReflectProxy, 96 kJavaLangStringArrayClass, 97 kJavaLangReflectConstructorArrayClass, 98 kJavaLangReflectFieldArrayClass, 99 kJavaLangReflectMethodArrayClass, 100 kJavaLangClassLoader, 101 kJavaLangThrowable, 102 kJavaLangClassNotFoundException, 103 kJavaLangStackTraceElement, 104 kPrimitiveBoolean, 105 kPrimitiveByte, 106 kPrimitiveChar, 107 kPrimitiveDouble, 108 kPrimitiveFloat, 109 kPrimitiveInt, 110 kPrimitiveLong, 111 kPrimitiveShort, 112 kPrimitiveVoid, 113 kBooleanArrayClass, 114 kByteArrayClass, 115 kCharArrayClass, 116 kDoubleArrayClass, 117 kFloatArrayClass, 118 kIntArrayClass, 119 kLongArrayClass, 120 kShortArrayClass, 121 kJavaLangStackTraceElementArrayClass, 122 kClassRootsMax, 123 }; 124 125 explicit ClassLinker(InternTable* intern_table); 126 ~ClassLinker(); 127 128 // Initialize class linker by bootstraping from dex files. 129 bool InitWithoutImage(std::vector<std::unique_ptr<const DexFile>> boot_class_path, 130 std::string* error_msg) 131 SHARED_REQUIRES(Locks::mutator_lock_) 132 REQUIRES(!dex_lock_); 133 134 // Initialize class linker from one or more boot images. 135 bool InitFromBootImage(std::string* error_msg) 136 SHARED_REQUIRES(Locks::mutator_lock_) 137 REQUIRES(!dex_lock_); 138 139 // Add an image space to the class linker, may fix up classloader fields and dex cache fields. 140 // The dex files that were newly opened for the space are placed in the out argument 141 // out_dex_files. Returns true if the operation succeeded. 142 // The space must be already added to the heap before calling AddImageSpace since we need to 143 // properly handle read barriers and object marking. 144 bool AddImageSpace(gc::space::ImageSpace* space, 145 Handle<mirror::ClassLoader> class_loader, 146 jobjectArray dex_elements, 147 const char* dex_location, 148 std::vector<std::unique_ptr<const DexFile>>* out_dex_files, 149 std::string* error_msg) 150 REQUIRES(!dex_lock_) 151 SHARED_REQUIRES(Locks::mutator_lock_); 152 153 bool OpenImageDexFiles(gc::space::ImageSpace* space, 154 std::vector<std::unique_ptr<const DexFile>>* out_dex_files, 155 std::string* error_msg) 156 REQUIRES(!dex_lock_) 157 SHARED_REQUIRES(Locks::mutator_lock_); 158 159 // Finds a class by its descriptor, loading it if necessary. 160 // If class_loader is null, searches boot_class_path_. 161 mirror::Class* FindClass(Thread* self, 162 const char* descriptor, 163 Handle<mirror::ClassLoader> class_loader) 164 SHARED_REQUIRES(Locks::mutator_lock_) 165 REQUIRES(!dex_lock_); 166 167 // Finds a class in the path class loader, loading it if necessary without using JNI. Hash 168 // function is supposed to be ComputeModifiedUtf8Hash(descriptor). Returns true if the 169 // class-loader chain could be handled, false otherwise, i.e., a non-supported class-loader 170 // was encountered while walking the parent chain (currently only BootClassLoader and 171 // PathClassLoader are supported). 172 bool FindClassInPathClassLoader(ScopedObjectAccessAlreadyRunnable& soa, 173 Thread* self, 174 const char* descriptor, 175 size_t hash, 176 Handle<mirror::ClassLoader> class_loader, 177 mirror::Class** result) 178 SHARED_REQUIRES(Locks::mutator_lock_) 179 REQUIRES(!dex_lock_); 180 181 // Finds a class by its descriptor using the "system" class loader, ie by searching the 182 // boot_class_path_. 183 mirror::Class* FindSystemClass(Thread* self, const char* descriptor) 184 SHARED_REQUIRES(Locks::mutator_lock_) 185 REQUIRES(!dex_lock_); 186 187 // Finds the array class given for the element class. 188 mirror::Class* FindArrayClass(Thread* self, mirror::Class** element_class) 189 SHARED_REQUIRES(Locks::mutator_lock_) 190 REQUIRES(!dex_lock_); 191 192 // Returns true if the class linker is initialized. 193 bool IsInitialized() const { 194 return init_done_; 195 } 196 197 // Define a new a class based on a ClassDef from a DexFile 198 mirror::Class* DefineClass(Thread* self, 199 const char* descriptor, 200 size_t hash, 201 Handle<mirror::ClassLoader> class_loader, 202 const DexFile& dex_file, 203 const DexFile::ClassDef& dex_class_def) 204 SHARED_REQUIRES(Locks::mutator_lock_) 205 REQUIRES(!dex_lock_); 206 207 // Finds a class by its descriptor, returning null if it isn't wasn't loaded 208 // by the given 'class_loader'. 209 mirror::Class* LookupClass(Thread* self, 210 const char* descriptor, 211 size_t hash, 212 mirror::ClassLoader* class_loader) 213 REQUIRES(!Locks::classlinker_classes_lock_) 214 SHARED_REQUIRES(Locks::mutator_lock_); 215 216 // Finds all the classes with the given descriptor, regardless of ClassLoader. 217 void LookupClasses(const char* descriptor, std::vector<mirror::Class*>& classes) 218 REQUIRES(!Locks::classlinker_classes_lock_) 219 SHARED_REQUIRES(Locks::mutator_lock_); 220 221 mirror::Class* FindPrimitiveClass(char type) SHARED_REQUIRES(Locks::mutator_lock_); 222 223 // General class unloading is not supported, this is used to prune 224 // unwanted classes during image writing. 225 bool RemoveClass(const char* descriptor, mirror::ClassLoader* class_loader) 226 REQUIRES(!Locks::classlinker_classes_lock_) 227 SHARED_REQUIRES(Locks::mutator_lock_); 228 229 void DumpAllClasses(int flags) 230 REQUIRES(!Locks::classlinker_classes_lock_) 231 SHARED_REQUIRES(Locks::mutator_lock_); 232 233 void DumpForSigQuit(std::ostream& os) REQUIRES(!Locks::classlinker_classes_lock_); 234 235 size_t NumLoadedClasses() 236 REQUIRES(!Locks::classlinker_classes_lock_) 237 SHARED_REQUIRES(Locks::mutator_lock_); 238 239 // Resolve a String with the given index from the DexFile, storing the 240 // result in the DexCache. The referrer is used to identify the 241 // target DexCache and ClassLoader to use for resolution. 242 mirror::String* ResolveString(uint32_t string_idx, ArtMethod* referrer) 243 SHARED_REQUIRES(Locks::mutator_lock_); 244 245 // Resolve a String with the given index from the DexFile, storing the 246 // result in the DexCache. 247 mirror::String* ResolveString(const DexFile& dex_file, uint32_t string_idx, 248 Handle<mirror::DexCache> dex_cache) 249 SHARED_REQUIRES(Locks::mutator_lock_); 250 251 // Find a String with the given index from the DexFile, storing the 252 // result in the DexCache if found. Return null if not found. 253 mirror::String* LookupString(const DexFile& dex_file, uint32_t string_idx, 254 Handle<mirror::DexCache> dex_cache) 255 SHARED_REQUIRES(Locks::mutator_lock_); 256 257 // Resolve a Type with the given index from the DexFile, storing the 258 // result in the DexCache. The referrer is used to identity the 259 // target DexCache and ClassLoader to use for resolution. 260 mirror::Class* ResolveType(const DexFile& dex_file, uint16_t type_idx, mirror::Class* referrer) 261 SHARED_REQUIRES(Locks::mutator_lock_) 262 REQUIRES(!dex_lock_, !Roles::uninterruptible_); 263 264 // Resolve a Type with the given index from the DexFile, storing the 265 // result in the DexCache. The referrer is used to identify the 266 // target DexCache and ClassLoader to use for resolution. 267 mirror::Class* ResolveType(uint16_t type_idx, ArtMethod* referrer) 268 SHARED_REQUIRES(Locks::mutator_lock_) 269 REQUIRES(!dex_lock_, !Roles::uninterruptible_); 270 271 mirror::Class* ResolveType(uint16_t type_idx, ArtField* referrer) 272 SHARED_REQUIRES(Locks::mutator_lock_) 273 REQUIRES(!dex_lock_, !Roles::uninterruptible_); 274 275 // Resolve a type with the given ID from the DexFile, storing the 276 // result in DexCache. The ClassLoader is used to search for the 277 // type, since it may be referenced from but not contained within 278 // the given DexFile. 279 mirror::Class* ResolveType(const DexFile& dex_file, 280 uint16_t type_idx, 281 Handle<mirror::DexCache> dex_cache, 282 Handle<mirror::ClassLoader> class_loader) 283 SHARED_REQUIRES(Locks::mutator_lock_) 284 REQUIRES(!dex_lock_, !Roles::uninterruptible_); 285 286 // Determine whether a dex cache result should be trusted, or an IncompatibleClassChangeError 287 // check should be performed even after a hit. 288 enum ResolveMode { // private. 289 kNoICCECheckForCache, 290 kForceICCECheck 291 }; 292 293 // Resolve a method with a given ID from the DexFile, storing the 294 // result in DexCache. The ClassLinker and ClassLoader are used as 295 // in ResolveType. What is unique is the method type argument which 296 // is used to determine if this method is a direct, static, or 297 // virtual method. 298 template <ResolveMode kResolveMode> 299 ArtMethod* ResolveMethod(const DexFile& dex_file, 300 uint32_t method_idx, 301 Handle<mirror::DexCache> dex_cache, 302 Handle<mirror::ClassLoader> class_loader, 303 ArtMethod* referrer, 304 InvokeType type) 305 SHARED_REQUIRES(Locks::mutator_lock_) 306 REQUIRES(!dex_lock_, !Roles::uninterruptible_); 307 308 ArtMethod* GetResolvedMethod(uint32_t method_idx, ArtMethod* referrer) 309 SHARED_REQUIRES(Locks::mutator_lock_); 310 311 // This returns the class referred to by GetMethodId(method_idx).class_idx_. This might be 312 // different then the declaring class of the resolved method due to copied 313 // miranda/default/conflict methods. 314 mirror::Class* ResolveReferencedClassOfMethod(uint32_t method_idx, 315 Handle<mirror::DexCache> dex_cache, 316 Handle<mirror::ClassLoader> class_loader) 317 SHARED_REQUIRES(Locks::mutator_lock_) 318 REQUIRES(!dex_lock_, !Roles::uninterruptible_); 319 template <ResolveMode kResolveMode> 320 ArtMethod* ResolveMethod(Thread* self, uint32_t method_idx, ArtMethod* referrer, InvokeType type) 321 SHARED_REQUIRES(Locks::mutator_lock_) 322 REQUIRES(!dex_lock_, !Roles::uninterruptible_); 323 ArtMethod* ResolveMethodWithoutInvokeType(const DexFile& dex_file, 324 uint32_t method_idx, 325 Handle<mirror::DexCache> dex_cache, 326 Handle<mirror::ClassLoader> class_loader) 327 SHARED_REQUIRES(Locks::mutator_lock_) 328 REQUIRES(!dex_lock_, !Roles::uninterruptible_); 329 330 ArtField* GetResolvedField(uint32_t field_idx, mirror::Class* field_declaring_class) 331 SHARED_REQUIRES(Locks::mutator_lock_); 332 ArtField* GetResolvedField(uint32_t field_idx, mirror::DexCache* dex_cache) 333 SHARED_REQUIRES(Locks::mutator_lock_); 334 ArtField* ResolveField(uint32_t field_idx, ArtMethod* referrer, bool is_static) 335 SHARED_REQUIRES(Locks::mutator_lock_) 336 REQUIRES(!dex_lock_, !Roles::uninterruptible_); 337 338 // Resolve a field with a given ID from the DexFile, storing the 339 // result in DexCache. The ClassLinker and ClassLoader are used as 340 // in ResolveType. What is unique is the is_static argument which is 341 // used to determine if we are resolving a static or non-static 342 // field. 343 ArtField* ResolveField(const DexFile& dex_file, uint32_t field_idx, 344 Handle<mirror::DexCache> dex_cache, 345 Handle<mirror::ClassLoader> class_loader, bool is_static) 346 SHARED_REQUIRES(Locks::mutator_lock_) 347 REQUIRES(!dex_lock_, !Roles::uninterruptible_); 348 349 // Resolve a field with a given ID from the DexFile, storing the 350 // result in DexCache. The ClassLinker and ClassLoader are used as 351 // in ResolveType. No is_static argument is provided so that Java 352 // field resolution semantics are followed. 353 ArtField* ResolveFieldJLS(const DexFile& dex_file, 354 uint32_t field_idx, 355 Handle<mirror::DexCache> dex_cache, 356 Handle<mirror::ClassLoader> class_loader) 357 SHARED_REQUIRES(Locks::mutator_lock_) 358 REQUIRES(!dex_lock_, !Roles::uninterruptible_); 359 360 // Get shorty from method index without resolution. Used to do handlerization. 361 const char* MethodShorty(uint32_t method_idx, ArtMethod* referrer, uint32_t* length) 362 SHARED_REQUIRES(Locks::mutator_lock_); 363 364 // Returns true on success, false if there's an exception pending. 365 // can_run_clinit=false allows the compiler to attempt to init a class, 366 // given the restriction that no <clinit> execution is possible. 367 bool EnsureInitialized(Thread* self, 368 Handle<mirror::Class> c, 369 bool can_init_fields, 370 bool can_init_parents) 371 SHARED_REQUIRES(Locks::mutator_lock_) 372 REQUIRES(!dex_lock_, !Roles::uninterruptible_); 373 374 // Initializes classes that have instances in the image but that have 375 // <clinit> methods so they could not be initialized by the compiler. 376 void RunRootClinits() 377 SHARED_REQUIRES(Locks::mutator_lock_) 378 REQUIRES(!dex_lock_, !Roles::uninterruptible_); 379 380 mirror::DexCache* RegisterDexFile(const DexFile& dex_file, 381 mirror::ClassLoader* class_loader) 382 REQUIRES(!dex_lock_) 383 SHARED_REQUIRES(Locks::mutator_lock_); 384 void RegisterDexFile(const DexFile& dex_file, Handle<mirror::DexCache> dex_cache) 385 REQUIRES(!dex_lock_) 386 SHARED_REQUIRES(Locks::mutator_lock_); 387 388 const std::vector<const DexFile*>& GetBootClassPath() { 389 return boot_class_path_; 390 } 391 392 void VisitClasses(ClassVisitor* visitor) 393 REQUIRES(!Locks::classlinker_classes_lock_) 394 SHARED_REQUIRES(Locks::mutator_lock_); 395 396 // Less efficient variant of VisitClasses that copies the class_table_ into secondary storage 397 // so that it can visit individual classes without holding the doesn't hold the 398 // Locks::classlinker_classes_lock_. As the Locks::classlinker_classes_lock_ isn't held this code 399 // can race with insertion and deletion of classes while the visitor is being called. 400 void VisitClassesWithoutClassesLock(ClassVisitor* visitor) 401 SHARED_REQUIRES(Locks::mutator_lock_) 402 REQUIRES(!dex_lock_); 403 404 void VisitClassRoots(RootVisitor* visitor, VisitRootFlags flags) 405 REQUIRES(!Locks::classlinker_classes_lock_) 406 SHARED_REQUIRES(Locks::mutator_lock_); 407 void VisitRoots(RootVisitor* visitor, VisitRootFlags flags) 408 REQUIRES(!dex_lock_) 409 SHARED_REQUIRES(Locks::mutator_lock_); 410 411 mirror::DexCache* FindDexCache(Thread* self, 412 const DexFile& dex_file, 413 bool allow_failure = false) 414 REQUIRES(!dex_lock_) 415 SHARED_REQUIRES(Locks::mutator_lock_); 416 void FixupDexCaches(ArtMethod* resolution_method) 417 REQUIRES(!dex_lock_) 418 SHARED_REQUIRES(Locks::mutator_lock_); 419 420 // Allocate an instance of a java.lang.Object. 421 mirror::Object* AllocObject(Thread* self) 422 SHARED_REQUIRES(Locks::mutator_lock_) 423 REQUIRES(!Roles::uninterruptible_); 424 425 // TODO: replace this with multiple methods that allocate the correct managed type. 426 template <class T> 427 mirror::ObjectArray<T>* AllocObjectArray(Thread* self, size_t length) 428 SHARED_REQUIRES(Locks::mutator_lock_) 429 REQUIRES(!Roles::uninterruptible_); 430 431 mirror::ObjectArray<mirror::Class>* AllocClassArray(Thread* self, size_t length) 432 SHARED_REQUIRES(Locks::mutator_lock_) 433 REQUIRES(!Roles::uninterruptible_); 434 435 mirror::ObjectArray<mirror::String>* AllocStringArray(Thread* self, size_t length) 436 SHARED_REQUIRES(Locks::mutator_lock_) 437 REQUIRES(!Roles::uninterruptible_); 438 439 LengthPrefixedArray<ArtField>* AllocArtFieldArray(Thread* self, 440 LinearAlloc* allocator, 441 size_t length); 442 443 LengthPrefixedArray<ArtMethod>* AllocArtMethodArray(Thread* self, 444 LinearAlloc* allocator, 445 size_t length); 446 447 mirror::PointerArray* AllocPointerArray(Thread* self, size_t length) 448 SHARED_REQUIRES(Locks::mutator_lock_) 449 REQUIRES(!Roles::uninterruptible_); 450 451 mirror::IfTable* AllocIfTable(Thread* self, size_t ifcount) 452 SHARED_REQUIRES(Locks::mutator_lock_) 453 REQUIRES(!Roles::uninterruptible_); 454 455 mirror::ObjectArray<mirror::StackTraceElement>* AllocStackTraceElementArray(Thread* self, 456 size_t length) 457 SHARED_REQUIRES(Locks::mutator_lock_) 458 REQUIRES(!Roles::uninterruptible_); 459 460 void VerifyClass(Thread* self, 461 Handle<mirror::Class> klass, 462 LogSeverity log_level = LogSeverity::NONE) 463 SHARED_REQUIRES(Locks::mutator_lock_) 464 REQUIRES(!dex_lock_); 465 bool VerifyClassUsingOatFile(const DexFile& dex_file, 466 mirror::Class* klass, 467 mirror::Class::Status& oat_file_class_status) 468 SHARED_REQUIRES(Locks::mutator_lock_) 469 REQUIRES(!dex_lock_); 470 void ResolveClassExceptionHandlerTypes(Handle<mirror::Class> klass) 471 SHARED_REQUIRES(Locks::mutator_lock_) 472 REQUIRES(!dex_lock_); 473 void ResolveMethodExceptionHandlerTypes(ArtMethod* klass) 474 SHARED_REQUIRES(Locks::mutator_lock_) 475 REQUIRES(!dex_lock_); 476 477 mirror::Class* CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, 478 jstring name, 479 jobjectArray interfaces, 480 jobject loader, 481 jobjectArray methods, 482 jobjectArray throws) 483 SHARED_REQUIRES(Locks::mutator_lock_); 484 std::string GetDescriptorForProxy(mirror::Class* proxy_class) 485 SHARED_REQUIRES(Locks::mutator_lock_); 486 ArtMethod* FindMethodForProxy(mirror::Class* proxy_class, ArtMethod* proxy_method) 487 REQUIRES(!dex_lock_) 488 SHARED_REQUIRES(Locks::mutator_lock_); 489 490 // Get the oat code for a method when its class isn't yet initialized 491 const void* GetQuickOatCodeFor(ArtMethod* method) 492 SHARED_REQUIRES(Locks::mutator_lock_); 493 494 // Get compiled code for a method, return null if no code 495 // exists. This is unlike Get..OatCodeFor which will return a bridge 496 // or interpreter entrypoint. 497 const void* GetOatMethodQuickCodeFor(ArtMethod* method) 498 SHARED_REQUIRES(Locks::mutator_lock_); 499 500 const OatFile::OatMethod FindOatMethodFor(ArtMethod* method, bool* found) 501 SHARED_REQUIRES(Locks::mutator_lock_); 502 503 pid_t GetClassesLockOwner(); // For SignalCatcher. 504 pid_t GetDexLockOwner(); // For SignalCatcher. 505 506 mirror::Class* GetClassRoot(ClassRoot class_root) SHARED_REQUIRES(Locks::mutator_lock_); 507 508 static const char* GetClassRootDescriptor(ClassRoot class_root); 509 510 // Is the given entry point quick code to run the resolution stub? 511 bool IsQuickResolutionStub(const void* entry_point) const; 512 513 // Is the given entry point quick code to bridge into the interpreter? 514 bool IsQuickToInterpreterBridge(const void* entry_point) const; 515 516 // Is the given entry point quick code to run the generic JNI stub? 517 bool IsQuickGenericJniStub(const void* entry_point) const; 518 519 InternTable* GetInternTable() const { 520 return intern_table_; 521 } 522 523 // Set the entrypoints up for method to the given code. 524 void SetEntryPointsToCompiledCode(ArtMethod* method, const void* method_code) const 525 SHARED_REQUIRES(Locks::mutator_lock_); 526 527 // Set the entrypoints up for method to the enter the interpreter. 528 void SetEntryPointsToInterpreter(ArtMethod* method) const 529 SHARED_REQUIRES(Locks::mutator_lock_); 530 531 // Attempts to insert a class into a class table. Returns null if 532 // the class was inserted, otherwise returns an existing class with 533 // the same descriptor and ClassLoader. 534 mirror::Class* InsertClass(const char* descriptor, mirror::Class* klass, size_t hash) 535 REQUIRES(!Locks::classlinker_classes_lock_) 536 SHARED_REQUIRES(Locks::mutator_lock_); 537 538 mirror::ObjectArray<mirror::Class>* GetClassRoots() SHARED_REQUIRES(Locks::mutator_lock_) { 539 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 540 DCHECK(class_roots != nullptr); 541 return class_roots; 542 } 543 544 // Move all of the boot image classes into the class table for faster lookups. 545 void AddBootImageClassesToClassTable() 546 REQUIRES(!Locks::classlinker_classes_lock_) 547 SHARED_REQUIRES(Locks::mutator_lock_); 548 549 // Add image classes to the class table. 550 void AddImageClassesToClassTable(std::vector<gc::space::ImageSpace*> image_spaces, 551 mirror::ClassLoader* class_loader) 552 REQUIRES(!Locks::classlinker_classes_lock_) 553 SHARED_REQUIRES(Locks::mutator_lock_); 554 555 // Move the class table to the pre-zygote table to reduce memory usage. This works by ensuring 556 // that no more classes are ever added to the pre zygote table which makes it that the pages 557 // always remain shared dirty instead of private dirty. 558 void MoveClassTableToPreZygote() 559 REQUIRES(!Locks::classlinker_classes_lock_) 560 SHARED_REQUIRES(Locks::mutator_lock_); 561 562 // Creates a GlobalRef PathClassLoader that can be used to load classes from the given dex files. 563 // Note: the objects are not completely set up. Do not use this outside of tests and the compiler. 564 jobject CreatePathClassLoader(Thread* self, const std::vector<const DexFile*>& dex_files) 565 SHARED_REQUIRES(Locks::mutator_lock_) 566 REQUIRES(!dex_lock_); 567 568 size_t GetImagePointerSize() const { 569 DCHECK(ValidPointerSize(image_pointer_size_)) << image_pointer_size_; 570 return image_pointer_size_; 571 } 572 573 // Used by image writer for checking. 574 bool ClassInClassTable(mirror::Class* klass) 575 REQUIRES(Locks::classlinker_classes_lock_) 576 SHARED_REQUIRES(Locks::mutator_lock_); 577 578 ArtMethod* CreateRuntimeMethod(LinearAlloc* linear_alloc); 579 580 // Clear the ArrayClass cache. This is necessary when cleaning up for the image, as the cache 581 // entries are roots, but potentially not image classes. 582 void DropFindArrayClassCache() SHARED_REQUIRES(Locks::mutator_lock_); 583 584 // Clean up class loaders, this needs to happen after JNI weak globals are cleared. 585 void CleanupClassLoaders() 586 REQUIRES(!Locks::classlinker_classes_lock_) 587 SHARED_REQUIRES(Locks::mutator_lock_); 588 589 // Unlike GetOrCreateAllocatorForClassLoader, GetAllocatorForClassLoader asserts that the 590 // allocator for this class loader is already created. 591 LinearAlloc* GetAllocatorForClassLoader(mirror::ClassLoader* class_loader) 592 SHARED_REQUIRES(Locks::mutator_lock_); 593 594 // Return the linear alloc for a class loader if it is already allocated, otherwise allocate and 595 // set it. TODO: Consider using a lock other than classlinker_classes_lock_. 596 LinearAlloc* GetOrCreateAllocatorForClassLoader(mirror::ClassLoader* class_loader) 597 REQUIRES(!Locks::classlinker_classes_lock_) 598 SHARED_REQUIRES(Locks::mutator_lock_); 599 600 // May be called with null class_loader due to legacy code. b/27954959 601 void InsertDexFileInToClassLoader(mirror::Object* dex_file, mirror::ClassLoader* class_loader) 602 REQUIRES(!Locks::classlinker_classes_lock_) 603 SHARED_REQUIRES(Locks::mutator_lock_); 604 605 static bool ShouldUseInterpreterEntrypoint(ArtMethod* method, const void* quick_code) 606 SHARED_REQUIRES(Locks::mutator_lock_); 607 608 std::set<DexCacheResolvedClasses> GetResolvedClasses(bool ignore_boot_classes) 609 REQUIRES(!dex_lock_); 610 611 std::unordered_set<std::string> GetClassDescriptorsForProfileKeys( 612 const std::set<DexCacheResolvedClasses>& classes) 613 REQUIRES(!dex_lock_); 614 615 static bool IsBootClassLoader(ScopedObjectAccessAlreadyRunnable& soa, 616 mirror::ClassLoader* class_loader) 617 SHARED_REQUIRES(Locks::mutator_lock_); 618 619 ArtMethod* AddMethodToConflictTable(mirror::Class* klass, 620 ArtMethod* conflict_method, 621 ArtMethod* interface_method, 622 ArtMethod* method, 623 bool force_new_conflict_method) 624 SHARED_REQUIRES(Locks::mutator_lock_); 625 626 // Create a conflict table with a specified capacity. 627 ImtConflictTable* CreateImtConflictTable(size_t count, LinearAlloc* linear_alloc); 628 629 // Static version for when the class linker is not yet created. 630 static ImtConflictTable* CreateImtConflictTable(size_t count, 631 LinearAlloc* linear_alloc, 632 size_t pointer_size); 633 634 635 // Create the IMT and conflict tables for a class. 636 void FillIMTAndConflictTables(mirror::Class* klass) SHARED_REQUIRES(Locks::mutator_lock_); 637 638 // Clear class table strong roots (other than classes themselves). This is done by dex2oat to 639 // allow pruning dex caches. 640 void ClearClassTableStrongRoots() const 641 REQUIRES(!Locks::classlinker_classes_lock_) 642 SHARED_REQUIRES(Locks::mutator_lock_); 643 644 // Throw the class initialization failure recorded when first trying to initialize the given 645 // class. 646 void ThrowEarlierClassFailure(mirror::Class* c, bool wrap_in_no_class_def = false) 647 SHARED_REQUIRES(Locks::mutator_lock_) 648 REQUIRES(!dex_lock_); 649 650 struct DexCacheData { 651 // Weak root to the DexCache. Note: Do not decode this unnecessarily or else class unloading may 652 // not work properly. 653 jweak weak_root; 654 // The following two fields are caches to the DexCache's fields and here to avoid unnecessary 655 // jweak decode that triggers read barriers (and mark them alive unnecessarily and mess with 656 // class unloading.) 657 const DexFile* dex_file; 658 GcRoot<mirror::Class>* resolved_types; 659 }; 660 661 private: 662 struct ClassLoaderData { 663 jweak weak_root; // Weak root to enable class unloading. 664 ClassTable* class_table; 665 LinearAlloc* allocator; 666 }; 667 668 // Ensures that the supertype of 'klass' ('supertype') is verified. Returns false and throws 669 // appropriate exceptions if verification failed hard. Returns true for successful verification or 670 // soft-failures. 671 bool AttemptSupertypeVerification(Thread* self, 672 Handle<mirror::Class> klass, 673 Handle<mirror::Class> supertype) 674 REQUIRES(!dex_lock_) 675 SHARED_REQUIRES(Locks::mutator_lock_); 676 677 static void DeleteClassLoader(Thread* self, const ClassLoaderData& data) 678 REQUIRES(Locks::classlinker_classes_lock_) 679 SHARED_REQUIRES(Locks::mutator_lock_); 680 681 void VisitClassLoaders(ClassLoaderVisitor* visitor) const 682 SHARED_REQUIRES(Locks::classlinker_classes_lock_, Locks::mutator_lock_); 683 684 void VisitClassesInternal(ClassVisitor* visitor) 685 SHARED_REQUIRES(Locks::classlinker_classes_lock_, Locks::mutator_lock_); 686 687 // Returns the number of zygote and image classes. 688 size_t NumZygoteClasses() const 689 REQUIRES(Locks::classlinker_classes_lock_) 690 SHARED_REQUIRES(Locks::mutator_lock_); 691 692 // Returns the number of non zygote nor image classes. 693 size_t NumNonZygoteClasses() const 694 REQUIRES(Locks::classlinker_classes_lock_) 695 SHARED_REQUIRES(Locks::mutator_lock_); 696 697 void FinishInit(Thread* self) 698 SHARED_REQUIRES(Locks::mutator_lock_) 699 REQUIRES(!dex_lock_, !Roles::uninterruptible_); 700 701 // For early bootstrapping by Init 702 mirror::Class* AllocClass(Thread* self, mirror::Class* java_lang_Class, uint32_t class_size) 703 SHARED_REQUIRES(Locks::mutator_lock_) 704 REQUIRES(!Roles::uninterruptible_); 705 706 // Alloc* convenience functions to avoid needing to pass in mirror::Class* 707 // values that are known to the ClassLinker such as 708 // kObjectArrayClass and kJavaLangString etc. 709 mirror::Class* AllocClass(Thread* self, uint32_t class_size) 710 SHARED_REQUIRES(Locks::mutator_lock_) 711 REQUIRES(!Roles::uninterruptible_); 712 mirror::DexCache* AllocDexCache(Thread* self, 713 const DexFile& dex_file, 714 LinearAlloc* linear_alloc) 715 SHARED_REQUIRES(Locks::mutator_lock_) 716 REQUIRES(!Roles::uninterruptible_); 717 718 mirror::Class* CreatePrimitiveClass(Thread* self, Primitive::Type type) 719 SHARED_REQUIRES(Locks::mutator_lock_) 720 REQUIRES(!Roles::uninterruptible_); 721 mirror::Class* InitializePrimitiveClass(mirror::Class* primitive_class, Primitive::Type type) 722 SHARED_REQUIRES(Locks::mutator_lock_) 723 REQUIRES(!Roles::uninterruptible_); 724 725 mirror::Class* CreateArrayClass(Thread* self, 726 const char* descriptor, 727 size_t hash, 728 Handle<mirror::ClassLoader> class_loader) 729 SHARED_REQUIRES(Locks::mutator_lock_) 730 REQUIRES(!dex_lock_, !Roles::uninterruptible_); 731 732 void AppendToBootClassPath(Thread* self, const DexFile& dex_file) 733 SHARED_REQUIRES(Locks::mutator_lock_) 734 REQUIRES(!dex_lock_); 735 void AppendToBootClassPath(const DexFile& dex_file, Handle<mirror::DexCache> dex_cache) 736 SHARED_REQUIRES(Locks::mutator_lock_) 737 REQUIRES(!dex_lock_); 738 739 // Precomputes size needed for Class, in the case of a non-temporary class this size must be 740 // sufficient to hold all static fields. 741 uint32_t SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 742 const DexFile::ClassDef& dex_class_def); 743 744 // Setup the classloader, class def index, type idx so that we can insert this class in the class 745 // table. 746 void SetupClass(const DexFile& dex_file, 747 const DexFile::ClassDef& dex_class_def, 748 Handle<mirror::Class> klass, 749 mirror::ClassLoader* class_loader) 750 SHARED_REQUIRES(Locks::mutator_lock_); 751 752 void LoadClass(Thread* self, 753 const DexFile& dex_file, 754 const DexFile::ClassDef& dex_class_def, 755 Handle<mirror::Class> klass) 756 SHARED_REQUIRES(Locks::mutator_lock_); 757 void LoadClassMembers(Thread* self, 758 const DexFile& dex_file, 759 const uint8_t* class_data, 760 Handle<mirror::Class> klass, 761 const OatFile::OatClass* oat_class) 762 SHARED_REQUIRES(Locks::mutator_lock_); 763 764 void LoadField(const ClassDataItemIterator& it, Handle<mirror::Class> klass, ArtField* dst) 765 SHARED_REQUIRES(Locks::mutator_lock_); 766 767 void LoadMethod(Thread* self, 768 const DexFile& dex_file, 769 const ClassDataItemIterator& it, 770 Handle<mirror::Class> klass, ArtMethod* dst) 771 SHARED_REQUIRES(Locks::mutator_lock_); 772 773 void FixupStaticTrampolines(mirror::Class* klass) SHARED_REQUIRES(Locks::mutator_lock_); 774 775 // Finds the associated oat class for a dex_file and descriptor. Returns an invalid OatClass on 776 // error and sets found to false. 777 OatFile::OatClass FindOatClass(const DexFile& dex_file, uint16_t class_def_idx, bool* found) 778 SHARED_REQUIRES(Locks::mutator_lock_); 779 780 void RegisterDexFileLocked(const DexFile& dex_file, Handle<mirror::DexCache> dex_cache) 781 REQUIRES(dex_lock_) 782 SHARED_REQUIRES(Locks::mutator_lock_); 783 mirror::DexCache* FindDexCacheLocked(Thread* self, const DexFile& dex_file, bool allow_failure) 784 REQUIRES(dex_lock_) 785 SHARED_REQUIRES(Locks::mutator_lock_); 786 787 bool InitializeClass(Thread* self, 788 Handle<mirror::Class> klass, 789 bool can_run_clinit, 790 bool can_init_parents) 791 SHARED_REQUIRES(Locks::mutator_lock_) 792 REQUIRES(!dex_lock_); 793 bool InitializeDefaultInterfaceRecursive(Thread* self, 794 Handle<mirror::Class> klass, 795 bool can_run_clinit, 796 bool can_init_parents) 797 REQUIRES(!dex_lock_) 798 SHARED_REQUIRES(Locks::mutator_lock_); 799 bool WaitForInitializeClass(Handle<mirror::Class> klass, 800 Thread* self, 801 ObjectLock<mirror::Class>& lock); 802 bool ValidateSuperClassDescriptors(Handle<mirror::Class> klass) 803 SHARED_REQUIRES(Locks::mutator_lock_); 804 805 bool IsSameDescriptorInDifferentClassContexts(Thread* self, 806 const char* descriptor, 807 Handle<mirror::ClassLoader> class_loader1, 808 Handle<mirror::ClassLoader> class_loader2) 809 SHARED_REQUIRES(Locks::mutator_lock_); 810 811 bool IsSameMethodSignatureInDifferentClassContexts(Thread* self, 812 ArtMethod* method, 813 mirror::Class* klass1, 814 mirror::Class* klass2) 815 SHARED_REQUIRES(Locks::mutator_lock_); 816 817 bool LinkClass(Thread* self, 818 const char* descriptor, 819 Handle<mirror::Class> klass, 820 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 821 MutableHandle<mirror::Class>* h_new_class_out) 822 SHARED_REQUIRES(Locks::mutator_lock_) 823 REQUIRES(!Locks::classlinker_classes_lock_); 824 825 bool LinkSuperClass(Handle<mirror::Class> klass) 826 SHARED_REQUIRES(Locks::mutator_lock_); 827 828 bool LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) 829 SHARED_REQUIRES(Locks::mutator_lock_) 830 REQUIRES(!dex_lock_); 831 832 bool LinkMethods(Thread* self, 833 Handle<mirror::Class> klass, 834 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 835 bool* out_new_conflict, 836 ArtMethod** out_imt) 837 SHARED_REQUIRES(Locks::mutator_lock_); 838 839 // Does anything needed to make sure that the compiler will not generate a direct invoke to this 840 // method. Should only be called on non-invokable methods. 841 void EnsureThrowsInvocationError(ArtMethod* method) 842 SHARED_REQUIRES(Locks::mutator_lock_); 843 844 // A wrapper class representing the result of a method translation used for linking methods and 845 // updating superclass default methods. For each method in a classes vtable there are 4 states it 846 // could be in: 847 // 1) No translation is necessary. In this case there is no MethodTranslation object for it. This 848 // is the standard case and is true when the method is not overridable by a default method, 849 // the class defines a concrete implementation of the method, the default method implementation 850 // remains the same, or an abstract method stayed abstract. 851 // 2) The method must be translated to a different default method. We note this with 852 // CreateTranslatedMethod. 853 // 3) The method must be replaced with a conflict method. This happens when a superclass 854 // implements an interface with a default method and this class implements an unrelated 855 // interface that also defines that default method. We note this with CreateConflictingMethod. 856 // 4) The method must be replaced with an abstract miranda method. This happens when a superclass 857 // implements an interface with a default method and this class implements a subinterface of 858 // the superclass's interface which declares the default method abstract. We note this with 859 // CreateAbstractMethod. 860 // 861 // When a method translation is unnecessary (case #1), we don't put it into the 862 // default_translation maps. So an instance of MethodTranslation must be in one of #2-#4. 863 class MethodTranslation { 864 public: 865 // This slot must become a default conflict method. 866 static MethodTranslation CreateConflictingMethod() { 867 return MethodTranslation(Type::kConflict, /*translation*/nullptr); 868 } 869 870 // This slot must become an abstract method. 871 static MethodTranslation CreateAbstractMethod() { 872 return MethodTranslation(Type::kAbstract, /*translation*/nullptr); 873 } 874 875 // Use the given method as the current value for this vtable slot during translation. 876 static MethodTranslation CreateTranslatedMethod(ArtMethod* new_method) { 877 return MethodTranslation(Type::kTranslation, new_method); 878 } 879 880 // Returns true if this is a method that must become a conflict method. 881 bool IsInConflict() const { 882 return type_ == Type::kConflict; 883 } 884 885 // Returns true if this is a method that must become an abstract method. 886 bool IsAbstract() const { 887 return type_ == Type::kAbstract; 888 } 889 890 // Returns true if this is a method that must become a different method. 891 bool IsTranslation() const { 892 return type_ == Type::kTranslation; 893 } 894 895 // Get the translated version of this method. 896 ArtMethod* GetTranslation() const { 897 DCHECK(IsTranslation()); 898 DCHECK(translation_ != nullptr); 899 return translation_; 900 } 901 902 private: 903 enum class Type { 904 kTranslation, 905 kConflict, 906 kAbstract, 907 }; 908 909 MethodTranslation(Type type, ArtMethod* translation) 910 : translation_(translation), type_(type) {} 911 912 ArtMethod* const translation_; 913 const Type type_; 914 }; 915 916 // Links the virtual methods for the given class and records any default methods that will need to 917 // be updated later. 918 // 919 // Arguments: 920 // * self - The current thread. 921 // * klass - class, whose vtable will be filled in. 922 // * default_translations - Vtable index to new method map. 923 // Any vtable entries that need to be updated with new default methods 924 // are stored into the default_translations map. The default_translations 925 // map is keyed on the vtable index that needs to be updated. We use this 926 // map because if we override a default method with another default 927 // method we need to update the vtable to point to the new method. 928 // Unfortunately since we copy the ArtMethod* we cannot just do a simple 929 // scan, we therefore store the vtable index's that might need to be 930 // updated with the method they will turn into. 931 // TODO This whole default_translations thing is very dirty. There should be a better way. 932 bool LinkVirtualMethods( 933 Thread* self, 934 Handle<mirror::Class> klass, 935 /*out*/std::unordered_map<size_t, MethodTranslation>* default_translations) 936 SHARED_REQUIRES(Locks::mutator_lock_); 937 938 // Sets up the interface lookup table (IFTable) in the correct order to allow searching for 939 // default methods. 940 bool SetupInterfaceLookupTable(Thread* self, 941 Handle<mirror::Class> klass, 942 Handle<mirror::ObjectArray<mirror::Class>> interfaces) 943 SHARED_REQUIRES(Locks::mutator_lock_); 944 945 946 enum class DefaultMethodSearchResult { 947 kDefaultFound, 948 kAbstractFound, 949 kDefaultConflict 950 }; 951 952 // Find the default method implementation for 'interface_method' in 'klass', if one exists. 953 // 954 // Arguments: 955 // * self - The current thread. 956 // * target_method - The method we are trying to find a default implementation for. 957 // * klass - The class we are searching for a definition of target_method. 958 // * out_default_method - The pointer we will store the found default method to on success. 959 // 960 // Return value: 961 // * kDefaultFound - There were no conflicting method implementations found in the class while 962 // searching for target_method. The default method implementation is stored into 963 // out_default_method. 964 // * kAbstractFound - There were no conflicting method implementations found in the class while 965 // searching for target_method but no default implementation was found either. 966 // out_default_method is set to null and the method should be considered not 967 // implemented. 968 // * kDefaultConflict - Conflicting method implementations were found when searching for 969 // target_method. The value of *out_default_method is null. 970 DefaultMethodSearchResult FindDefaultMethodImplementation( 971 Thread* self, 972 ArtMethod* target_method, 973 Handle<mirror::Class> klass, 974 /*out*/ArtMethod** out_default_method) const 975 SHARED_REQUIRES(Locks::mutator_lock_); 976 977 // Sets the imt entries and fixes up the vtable for the given class by linking all the interface 978 // methods. See LinkVirtualMethods for an explanation of what default_translations is. 979 bool LinkInterfaceMethods( 980 Thread* self, 981 Handle<mirror::Class> klass, 982 const std::unordered_map<size_t, MethodTranslation>& default_translations, 983 bool* out_new_conflict, 984 ArtMethod** out_imt) 985 SHARED_REQUIRES(Locks::mutator_lock_); 986 987 bool LinkStaticFields(Thread* self, Handle<mirror::Class> klass, size_t* class_size) 988 SHARED_REQUIRES(Locks::mutator_lock_); 989 bool LinkInstanceFields(Thread* self, Handle<mirror::Class> klass) 990 SHARED_REQUIRES(Locks::mutator_lock_); 991 bool LinkFields(Thread* self, Handle<mirror::Class> klass, bool is_static, size_t* class_size) 992 SHARED_REQUIRES(Locks::mutator_lock_); 993 void LinkCode(ArtMethod* method, 994 const OatFile::OatClass* oat_class, 995 uint32_t class_def_method_index) 996 SHARED_REQUIRES(Locks::mutator_lock_); 997 void CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) 998 SHARED_REQUIRES(Locks::mutator_lock_); 999 1000 void CheckProxyConstructor(ArtMethod* constructor) const 1001 SHARED_REQUIRES(Locks::mutator_lock_); 1002 void CheckProxyMethod(ArtMethod* method, ArtMethod* prototype) const 1003 SHARED_REQUIRES(Locks::mutator_lock_); 1004 1005 // For use by ImageWriter to find DexCaches for its roots 1006 ReaderWriterMutex* DexLock() 1007 SHARED_REQUIRES(Locks::mutator_lock_) 1008 LOCK_RETURNED(dex_lock_) { 1009 return &dex_lock_; 1010 } 1011 size_t GetDexCacheCount() SHARED_REQUIRES(Locks::mutator_lock_, dex_lock_) { 1012 return dex_caches_.size(); 1013 } 1014 const std::list<DexCacheData>& GetDexCachesData() 1015 SHARED_REQUIRES(Locks::mutator_lock_, dex_lock_) { 1016 return dex_caches_; 1017 } 1018 1019 void CreateProxyConstructor(Handle<mirror::Class> klass, ArtMethod* out) 1020 SHARED_REQUIRES(Locks::mutator_lock_); 1021 void CreateProxyMethod(Handle<mirror::Class> klass, ArtMethod* prototype, ArtMethod* out) 1022 SHARED_REQUIRES(Locks::mutator_lock_); 1023 1024 // Ensures that methods have the kAccSkipAccessChecks bit set. We use the 1025 // kAccVerificationAttempted bit on the class access flags to determine whether this has been done 1026 // before. 1027 void EnsureSkipAccessChecksMethods(Handle<mirror::Class> c) 1028 SHARED_REQUIRES(Locks::mutator_lock_); 1029 1030 mirror::Class* LookupClassFromBootImage(const char* descriptor) 1031 SHARED_REQUIRES(Locks::mutator_lock_); 1032 1033 // Register a class loader and create its class table and allocator. Should not be called if 1034 // these are already created. 1035 void RegisterClassLoader(mirror::ClassLoader* class_loader) 1036 SHARED_REQUIRES(Locks::mutator_lock_) 1037 REQUIRES(Locks::classlinker_classes_lock_); 1038 1039 // Returns null if not found. 1040 ClassTable* ClassTableForClassLoader(mirror::ClassLoader* class_loader) 1041 SHARED_REQUIRES(Locks::mutator_lock_); 1042 1043 // Insert a new class table if not found. 1044 ClassTable* InsertClassTableForClassLoader(mirror::ClassLoader* class_loader) 1045 SHARED_REQUIRES(Locks::mutator_lock_) 1046 REQUIRES(Locks::classlinker_classes_lock_); 1047 1048 // EnsureResolved is called to make sure that a class in the class_table_ has been resolved 1049 // before returning it to the caller. Its the responsibility of the thread that placed the class 1050 // in the table to make it resolved. The thread doing resolution must notify on the class' lock 1051 // when resolution has occurred. This happens in mirror::Class::SetStatus. As resolution may 1052 // retire a class, the version of the class in the table is returned and this may differ from 1053 // the class passed in. 1054 mirror::Class* EnsureResolved(Thread* self, const char* descriptor, mirror::Class* klass) 1055 WARN_UNUSED 1056 SHARED_REQUIRES(Locks::mutator_lock_) 1057 REQUIRES(!dex_lock_); 1058 1059 void FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) 1060 SHARED_REQUIRES(Locks::mutator_lock_); 1061 1062 void SetClassRoot(ClassRoot class_root, mirror::Class* klass) 1063 SHARED_REQUIRES(Locks::mutator_lock_); 1064 1065 // Return the quick generic JNI stub for testing. 1066 const void* GetRuntimeQuickGenericJniStub() const; 1067 1068 bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, bool can_init_parents) 1069 SHARED_REQUIRES(Locks::mutator_lock_); 1070 1071 void UpdateClassMethods(mirror::Class* klass, 1072 LengthPrefixedArray<ArtMethod>* new_methods) 1073 SHARED_REQUIRES(Locks::mutator_lock_) 1074 REQUIRES(!Locks::classlinker_classes_lock_); 1075 1076 // new_class_set is the set of classes that were read from the class table section in the image. 1077 // If there was no class table section, it is null. 1078 bool UpdateAppImageClassLoadersAndDexCaches( 1079 gc::space::ImageSpace* space, 1080 Handle<mirror::ClassLoader> class_loader, 1081 Handle<mirror::ObjectArray<mirror::DexCache>> dex_caches, 1082 ClassTable::ClassSet* new_class_set, 1083 bool* out_forward_dex_cache_array, 1084 std::string* out_error_msg) 1085 REQUIRES(!dex_lock_) 1086 SHARED_REQUIRES(Locks::mutator_lock_); 1087 1088 // Check that c1 == FindSystemClass(self, descriptor). Abort with class dumps otherwise. 1089 void CheckSystemClass(Thread* self, Handle<mirror::Class> c1, const char* descriptor) 1090 REQUIRES(!dex_lock_) 1091 SHARED_REQUIRES(Locks::mutator_lock_); 1092 1093 // Sets imt_ref appropriately for LinkInterfaceMethods. 1094 // If there is no method in the imt location of imt_ref it will store the given method there. 1095 // Otherwise it will set the conflict method which will figure out which method to use during 1096 // runtime. 1097 void SetIMTRef(ArtMethod* unimplemented_method, 1098 ArtMethod* imt_conflict_method, 1099 ArtMethod* current_method, 1100 /*out*/bool* new_conflict, 1101 /*out*/ArtMethod** imt_ref) SHARED_REQUIRES(Locks::mutator_lock_); 1102 1103 void FillIMTFromIfTable(mirror::IfTable* if_table, 1104 ArtMethod* unimplemented_method, 1105 ArtMethod* imt_conflict_method, 1106 mirror::Class* klass, 1107 bool create_conflict_tables, 1108 bool ignore_copied_methods, 1109 /*out*/bool* new_conflict, 1110 /*out*/ArtMethod** imt) SHARED_REQUIRES(Locks::mutator_lock_); 1111 1112 void FillImtFromSuperClass(Handle<mirror::Class> klass, 1113 ArtMethod* unimplemented_method, 1114 ArtMethod* imt_conflict_method, 1115 bool* new_conflict, 1116 ArtMethod** imt) SHARED_REQUIRES(Locks::mutator_lock_); 1117 1118 std::vector<const DexFile*> boot_class_path_; 1119 std::vector<std::unique_ptr<const DexFile>> boot_dex_files_; 1120 1121 mutable ReaderWriterMutex dex_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER; 1122 // JNI weak globals and side data to allow dex caches to get unloaded. We lazily delete weak 1123 // globals when we register new dex files. 1124 std::list<DexCacheData> dex_caches_ GUARDED_BY(dex_lock_); 1125 1126 // This contains the class loaders which have class tables. It is populated by 1127 // InsertClassTableForClassLoader. 1128 std::list<ClassLoaderData> class_loaders_ 1129 GUARDED_BY(Locks::classlinker_classes_lock_); 1130 1131 // Boot class path table. Since the class loader for this is null. 1132 ClassTable boot_class_table_ GUARDED_BY(Locks::classlinker_classes_lock_); 1133 1134 // New class roots, only used by CMS since the GC needs to mark these in the pause. 1135 std::vector<GcRoot<mirror::Class>> new_class_roots_ GUARDED_BY(Locks::classlinker_classes_lock_); 1136 1137 // Do we need to search dex caches to find boot image classes? 1138 bool dex_cache_boot_image_class_lookup_required_; 1139 // Number of times we've searched dex caches for a class. After a certain number of misses we move 1140 // the classes into the class_table_ to avoid dex cache based searches. 1141 Atomic<uint32_t> failed_dex_cache_class_lookups_; 1142 1143 // Well known mirror::Class roots. 1144 GcRoot<mirror::ObjectArray<mirror::Class>> class_roots_; 1145 1146 // The interface table used by all arrays. 1147 GcRoot<mirror::IfTable> array_iftable_; 1148 1149 // A cache of the last FindArrayClass results. The cache serves to avoid creating array class 1150 // descriptors for the sake of performing FindClass. 1151 static constexpr size_t kFindArrayCacheSize = 16; 1152 GcRoot<mirror::Class> find_array_class_cache_[kFindArrayCacheSize]; 1153 size_t find_array_class_cache_next_victim_; 1154 1155 bool init_done_; 1156 bool log_new_class_table_roots_ GUARDED_BY(Locks::classlinker_classes_lock_); 1157 1158 InternTable* intern_table_; 1159 1160 // Trampolines within the image the bounce to runtime entrypoints. Done so that there is a single 1161 // patch point within the image. TODO: make these proper relocations. 1162 const void* quick_resolution_trampoline_; 1163 const void* quick_imt_conflict_trampoline_; 1164 const void* quick_generic_jni_trampoline_; 1165 const void* quick_to_interpreter_bridge_trampoline_; 1166 1167 // Image pointer size. 1168 size_t image_pointer_size_; 1169 1170 friend class ImageDumper; // for DexLock 1171 friend class ImageWriter; // for GetClassRoots 1172 friend class JniCompilerTest; // for GetRuntimeQuickGenericJniStub 1173 friend class JniInternalTest; // for GetRuntimeQuickGenericJniStub 1174 ART_FRIEND_TEST(ClassLinkerTest, RegisterDexFileName); // for DexLock, and RegisterDexFileLocked 1175 ART_FRIEND_TEST(mirror::DexCacheTest, Open); // for AllocDexCache 1176 DISALLOW_COPY_AND_ASSIGN(ClassLinker); 1177 }; 1178 1179 } // namespace art 1180 1181 #endif // ART_RUNTIME_CLASS_LINKER_H_ 1182
