class_linker.h revision 47f867a0ae34d743f6159c2261e5b11e39693e15
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 <deque> 21#include <string> 22#include <utility> 23#include <vector> 24 25#include "base/allocator.h" 26#include "base/hash_set.h" 27#include "base/macros.h" 28#include "base/mutex.h" 29#include "dex_file.h" 30#include "gc_root.h" 31#include "jni.h" 32#include "oat_file.h" 33#include "object_callbacks.h" 34 35namespace art { 36 37namespace gc { 38namespace space { 39 class ImageSpace; 40} // namespace space 41} // namespace gc 42namespace mirror { 43 class ClassLoader; 44 class DexCache; 45 class DexCacheTest_Open_Test; 46 class IfTable; 47 template<class T> class ObjectArray; 48 class StackTraceElement; 49} // namespace mirror 50 51template<class T> class Handle; 52class InternTable; 53template<class T> class ObjectLock; 54class Runtime; 55class ScopedObjectAccessAlreadyRunnable; 56template<size_t kNumReferences> class PACKED(4) StackHandleScope; 57 58typedef bool (ClassVisitor)(mirror::Class* c, void* arg); 59 60enum VisitRootFlags : uint8_t; 61 62class ClassLinker { 63 public: 64 // Well known mirror::Class roots accessed via GetClassRoot. 65 enum ClassRoot { 66 kJavaLangClass, 67 kJavaLangObject, 68 kClassArrayClass, 69 kObjectArrayClass, 70 kJavaLangString, 71 kJavaLangDexCache, 72 kJavaLangRefReference, 73 kJavaLangReflectArtField, 74 kJavaLangReflectArtMethod, 75 kJavaLangReflectProxy, 76 kJavaLangStringArrayClass, 77 kJavaLangReflectArtFieldArrayClass, 78 kJavaLangReflectArtMethodArrayClass, 79 kJavaLangClassLoader, 80 kJavaLangThrowable, 81 kJavaLangClassNotFoundException, 82 kJavaLangStackTraceElement, 83 kPrimitiveBoolean, 84 kPrimitiveByte, 85 kPrimitiveChar, 86 kPrimitiveDouble, 87 kPrimitiveFloat, 88 kPrimitiveInt, 89 kPrimitiveLong, 90 kPrimitiveShort, 91 kPrimitiveVoid, 92 kBooleanArrayClass, 93 kByteArrayClass, 94 kCharArrayClass, 95 kDoubleArrayClass, 96 kFloatArrayClass, 97 kIntArrayClass, 98 kLongArrayClass, 99 kShortArrayClass, 100 kJavaLangStackTraceElementArrayClass, 101 kClassRootsMax, 102 }; 103 104 explicit ClassLinker(InternTable* intern_table); 105 ~ClassLinker(); 106 107 // Initialize class linker by bootstraping from dex files. 108 void InitWithoutImage(std::vector<std::unique_ptr<const DexFile>> boot_class_path) 109 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 110 111 // Initialize class linker from one or more images. 112 void InitFromImage() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 113 114 // Finds a class by its descriptor, loading it if necessary. 115 // If class_loader is null, searches boot_class_path_. 116 mirror::Class* FindClass(Thread* self, const char* descriptor, 117 Handle<mirror::ClassLoader> class_loader) 118 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 119 120 // Find a class in the path class loader, loading it if necessary without using JNI. Hash 121 // function is supposed to be ComputeModifiedUtf8Hash(descriptor). 122 mirror::Class* FindClassInPathClassLoader(ScopedObjectAccessAlreadyRunnable& soa, 123 Thread* self, const char* descriptor, size_t hash, 124 Handle<mirror::ClassLoader> class_loader) 125 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 126 127 // Finds a class by its descriptor using the "system" class loader, ie by searching the 128 // boot_class_path_. 129 mirror::Class* FindSystemClass(Thread* self, const char* descriptor) 130 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 131 132 // Finds the array class given for the element class. 133 mirror::Class* FindArrayClass(Thread* self, mirror::Class** element_class) 134 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 135 136 // Returns true if the class linker is initialized. 137 bool IsInitialized() const { 138 return init_done_; 139 } 140 141 // Define a new a class based on a ClassDef from a DexFile 142 mirror::Class* DefineClass(Thread* self, const char* descriptor, size_t hash, 143 Handle<mirror::ClassLoader> class_loader, 144 const DexFile& dex_file, const DexFile::ClassDef& dex_class_def) 145 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 146 147 // Finds a class by its descriptor, returning NULL if it isn't wasn't loaded 148 // by the given 'class_loader'. 149 mirror::Class* LookupClass(Thread* self, const char* descriptor, size_t hash, 150 mirror::ClassLoader* class_loader) 151 LOCKS_EXCLUDED(Locks::classlinker_classes_lock_) 152 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 153 154 // Finds all the classes with the given descriptor, regardless of ClassLoader. 155 void LookupClasses(const char* descriptor, std::vector<mirror::Class*>& classes) 156 LOCKS_EXCLUDED(Locks::classlinker_classes_lock_) 157 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 158 159 mirror::Class* FindPrimitiveClass(char type) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 160 161 // General class unloading is not supported, this is used to prune 162 // unwanted classes during image writing. 163 bool RemoveClass(const char* descriptor, mirror::ClassLoader* class_loader) 164 LOCKS_EXCLUDED(Locks::classlinker_classes_lock_) 165 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 166 167 void DumpAllClasses(int flags) 168 LOCKS_EXCLUDED(Locks::classlinker_classes_lock_) 169 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 170 171 void DumpForSigQuit(std::ostream& os) 172 LOCKS_EXCLUDED(Locks::classlinker_classes_lock_); 173 174 size_t NumLoadedClasses() 175 LOCKS_EXCLUDED(Locks::classlinker_classes_lock_) 176 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 177 178 // Resolve a String with the given index from the DexFile, storing the 179 // result in the DexCache. The referrer is used to identify the 180 // target DexCache and ClassLoader to use for resolution. 181 mirror::String* ResolveString(uint32_t string_idx, mirror::ArtMethod* referrer) 182 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 183 184 // Resolve a String with the given index from the DexFile, storing the 185 // result in the DexCache. 186 mirror::String* ResolveString(const DexFile& dex_file, uint32_t string_idx, 187 Handle<mirror::DexCache> dex_cache) 188 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 189 190 // Resolve a Type with the given index from the DexFile, storing the 191 // result in the DexCache. The referrer is used to identity the 192 // target DexCache and ClassLoader to use for resolution. 193 mirror::Class* ResolveType(const DexFile& dex_file, uint16_t type_idx, mirror::Class* referrer) 194 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 195 196 // Resolve a Type with the given index from the DexFile, storing the 197 // result in the DexCache. The referrer is used to identify the 198 // target DexCache and ClassLoader to use for resolution. 199 mirror::Class* ResolveType(uint16_t type_idx, mirror::ArtMethod* referrer) 200 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 201 202 mirror::Class* ResolveType(uint16_t type_idx, mirror::ArtField* referrer) 203 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 204 205 // Resolve a type with the given ID from the DexFile, storing the 206 // result in DexCache. The ClassLoader is used to search for the 207 // type, since it may be referenced from but not contained within 208 // the given DexFile. 209 mirror::Class* ResolveType(const DexFile& dex_file, uint16_t type_idx, 210 Handle<mirror::DexCache> dex_cache, 211 Handle<mirror::ClassLoader> class_loader) 212 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 213 214 // Resolve a method with a given ID from the DexFile, storing the 215 // result in DexCache. The ClassLinker and ClassLoader are used as 216 // in ResolveType. What is unique is the method type argument which 217 // is used to determine if this method is a direct, static, or 218 // virtual method. 219 mirror::ArtMethod* ResolveMethod(const DexFile& dex_file, 220 uint32_t method_idx, 221 Handle<mirror::DexCache> dex_cache, 222 Handle<mirror::ClassLoader> class_loader, 223 Handle<mirror::ArtMethod> referrer, 224 InvokeType type) 225 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 226 227 mirror::ArtMethod* GetResolvedMethod(uint32_t method_idx, mirror::ArtMethod* referrer) 228 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 229 mirror::ArtMethod* ResolveMethod(Thread* self, uint32_t method_idx, mirror::ArtMethod** referrer, 230 InvokeType type) 231 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 232 233 mirror::ArtField* GetResolvedField(uint32_t field_idx, mirror::Class* field_declaring_class) 234 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 235 mirror::ArtField* ResolveField(uint32_t field_idx, mirror::ArtMethod* referrer, 236 bool is_static) 237 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 238 239 // Resolve a field with a given ID from the DexFile, storing the 240 // result in DexCache. The ClassLinker and ClassLoader are used as 241 // in ResolveType. What is unique is the is_static argument which is 242 // used to determine if we are resolving a static or non-static 243 // field. 244 mirror::ArtField* ResolveField(const DexFile& dex_file, 245 uint32_t field_idx, 246 Handle<mirror::DexCache> dex_cache, 247 Handle<mirror::ClassLoader> class_loader, 248 bool is_static) 249 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 250 251 // Resolve a field with a given ID from the DexFile, storing the 252 // result in DexCache. The ClassLinker and ClassLoader are used as 253 // in ResolveType. No is_static argument is provided so that Java 254 // field resolution semantics are followed. 255 mirror::ArtField* ResolveFieldJLS(const DexFile& dex_file, uint32_t field_idx, 256 Handle<mirror::DexCache> dex_cache, 257 Handle<mirror::ClassLoader> class_loader) 258 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 259 260 // Get shorty from method index without resolution. Used to do handlerization. 261 const char* MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, uint32_t* length) 262 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 263 264 // Returns true on success, false if there's an exception pending. 265 // can_run_clinit=false allows the compiler to attempt to init a class, 266 // given the restriction that no <clinit> execution is possible. 267 bool EnsureInitialized(Thread* self, Handle<mirror::Class> c, bool can_init_fields, 268 bool can_init_parents) 269 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 270 271 // Initializes classes that have instances in the image but that have 272 // <clinit> methods so they could not be initialized by the compiler. 273 void RunRootClinits() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 274 275 void RegisterDexFile(const DexFile& dex_file) 276 LOCKS_EXCLUDED(dex_lock_) 277 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 278 void RegisterDexFile(const DexFile& dex_file, Handle<mirror::DexCache> dex_cache) 279 LOCKS_EXCLUDED(dex_lock_) 280 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 281 282 const OatFile* RegisterOatFile(const OatFile* oat_file) 283 LOCKS_EXCLUDED(dex_lock_); 284 285 const std::vector<const DexFile*>& GetBootClassPath() { 286 return boot_class_path_; 287 } 288 289 void VisitClasses(ClassVisitor* visitor, void* arg) 290 LOCKS_EXCLUDED(Locks::classlinker_classes_lock_) 291 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 292 293 // Less efficient variant of VisitClasses that copies the class_table_ into secondary storage 294 // so that it can visit individual classes without holding the doesn't hold the 295 // Locks::classlinker_classes_lock_. As the Locks::classlinker_classes_lock_ isn't held this code 296 // can race with insertion and deletion of classes while the visitor is being called. 297 void VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) 298 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 299 300 void VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) 301 LOCKS_EXCLUDED(Locks::classlinker_classes_lock_) 302 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 303 void VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) 304 LOCKS_EXCLUDED(dex_lock_) 305 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 306 307 mirror::DexCache* FindDexCache(const DexFile& dex_file) 308 LOCKS_EXCLUDED(dex_lock_) 309 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 310 bool IsDexFileRegistered(const DexFile& dex_file) 311 LOCKS_EXCLUDED(dex_lock_) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 312 void FixupDexCaches(mirror::ArtMethod* resolution_method) 313 LOCKS_EXCLUDED(dex_lock_) 314 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 315 316 // Finds or creates the oat file holding dex_location. Then loads and returns 317 // all corresponding dex files (there may be more than one dex file loaded 318 // in the case of multidex). 319 // This may return the original, unquickened dex files if the oat file could 320 // not be generated. 321 // 322 // Returns an empty vector if the dex files could not be loaded. In this 323 // case, there will be at least one error message returned describing why no 324 // dex files could not be loaded. The 'error_msgs' argument must not be 325 // null, regardless of whether there is an error or not. 326 // 327 // This method should not be called with the mutator_lock_ held, because it 328 // could end up starving GC if we need to generate or relocate any oat 329 // files. 330 std::vector<std::unique_ptr<const DexFile>> OpenDexFilesFromOat( 331 const char* dex_location, const char* oat_location, 332 std::vector<std::string>* error_msgs) 333 LOCKS_EXCLUDED(dex_lock_, Locks::mutator_lock_); 334 335 // Allocate an instance of a java.lang.Object. 336 mirror::Object* AllocObject(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 337 338 // TODO: replace this with multiple methods that allocate the correct managed type. 339 template <class T> 340 mirror::ObjectArray<T>* AllocObjectArray(Thread* self, size_t length) 341 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 342 343 mirror::ObjectArray<mirror::Class>* AllocClassArray(Thread* self, size_t length) 344 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 345 346 mirror::ObjectArray<mirror::String>* AllocStringArray(Thread* self, size_t length) 347 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 348 349 mirror::ObjectArray<mirror::ArtMethod>* AllocArtMethodArray(Thread* self, size_t length) 350 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 351 352 mirror::IfTable* AllocIfTable(Thread* self, size_t ifcount) 353 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 354 355 mirror::ObjectArray<mirror::ArtField>* AllocArtFieldArray(Thread* self, size_t length) 356 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 357 358 mirror::ObjectArray<mirror::StackTraceElement>* AllocStackTraceElementArray(Thread* self, 359 size_t length) 360 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 361 362 void VerifyClass(Thread* self, Handle<mirror::Class> klass) 363 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 364 bool VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 365 mirror::Class::Status& oat_file_class_status) 366 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 367 void ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 368 Handle<mirror::Class> klass) 369 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 370 void ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, mirror::ArtMethod* klass) 371 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 372 373 mirror::Class* CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 374 jobjectArray interfaces, jobject loader, jobjectArray methods, 375 jobjectArray throws) 376 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 377 std::string GetDescriptorForProxy(mirror::Class* proxy_class) 378 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 379 mirror::ArtMethod* FindMethodForProxy(mirror::Class* proxy_class, 380 mirror::ArtMethod* proxy_method) 381 LOCKS_EXCLUDED(dex_lock_) 382 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 383 384 // Get the oat code for a method when its class isn't yet initialized 385 const void* GetQuickOatCodeFor(mirror::ArtMethod* method) 386 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 387 388 // Get the oat code for a method from a method index. 389 const void* GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, uint32_t method_idx) 390 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 391 392 // Get compiled code for a method, return null if no code 393 // exists. This is unlike Get..OatCodeFor which will return a bridge 394 // or interpreter entrypoint. 395 const void* GetOatMethodQuickCodeFor(mirror::ArtMethod* method) 396 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 397 398 pid_t GetClassesLockOwner(); // For SignalCatcher. 399 pid_t GetDexLockOwner(); // For SignalCatcher. 400 401 mirror::Class* GetClassRoot(ClassRoot class_root) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 402 403 static const char* GetClassRootDescriptor(ClassRoot class_root); 404 405 // Is the given entry point quick code to run the resolution stub? 406 bool IsQuickResolutionStub(const void* entry_point) const; 407 408 // Is the given entry point quick code to bridge into the interpreter? 409 bool IsQuickToInterpreterBridge(const void* entry_point) const; 410 411 // Is the given entry point quick code to run the generic JNI stub? 412 bool IsQuickGenericJniStub(const void* entry_point) const; 413 414 InternTable* GetInternTable() const { 415 return intern_table_; 416 } 417 418 // Set the entrypoints up for method to the given code. 419 void SetEntryPointsToCompiledCode(mirror::ArtMethod* method, const void* method_code) const 420 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 421 422 // Set the entrypoints up for method to the enter the interpreter. 423 void SetEntryPointsToInterpreter(mirror::ArtMethod* method) const 424 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 425 426 // Attempts to insert a class into a class table. Returns NULL if 427 // the class was inserted, otherwise returns an existing class with 428 // the same descriptor and ClassLoader. 429 mirror::Class* InsertClass(const char* descriptor, mirror::Class* klass, size_t hash) 430 LOCKS_EXCLUDED(Locks::classlinker_classes_lock_) 431 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 432 433 // Special code to allocate an art method, use this instead of class->AllocObject. 434 mirror::ArtMethod* AllocArtMethod(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 435 436 mirror::ObjectArray<mirror::Class>* GetClassRoots() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 437 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 438 DCHECK(class_roots != NULL); 439 return class_roots; 440 } 441 442 // Move all of the image classes into the class table for faster lookups. 443 void MoveImageClassesToClassTable() 444 LOCKS_EXCLUDED(Locks::classlinker_classes_lock_) 445 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 446 // Move the class table to the pre-zygote table to reduce memory usage. This works by ensuring 447 // that no more classes are ever added to the pre zygote table which makes it that the pages 448 // always remain shared dirty instead of private dirty. 449 void MoveClassTableToPreZygote() 450 LOCKS_EXCLUDED(Locks::classlinker_classes_lock_) 451 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 452 453 // Returns true if the method can be called with its direct code pointer, false otherwise. 454 bool MayBeCalledWithDirectCodePointer(mirror::ArtMethod* m) 455 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 456 457 private: 458 static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 459 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 460 461 const OatFile::OatMethod FindOatMethodFor(mirror::ArtMethod* method, bool* found) 462 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 463 464 OatFile& GetImageOatFile(gc::space::ImageSpace* space) 465 LOCKS_EXCLUDED(dex_lock_) 466 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 467 468 void FinishInit(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 469 470 // For early bootstrapping by Init 471 mirror::Class* AllocClass(Thread* self, mirror::Class* java_lang_Class, uint32_t class_size) 472 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 473 474 // Alloc* convenience functions to avoid needing to pass in mirror::Class* 475 // values that are known to the ClassLinker such as 476 // kObjectArrayClass and kJavaLangString etc. 477 mirror::Class* AllocClass(Thread* self, uint32_t class_size) 478 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 479 mirror::DexCache* AllocDexCache(Thread* self, const DexFile& dex_file) 480 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 481 mirror::ArtField* AllocArtField(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 482 483 mirror::Class* CreatePrimitiveClass(Thread* self, Primitive::Type type) 484 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 485 mirror::Class* InitializePrimitiveClass(mirror::Class* primitive_class, Primitive::Type type) 486 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 487 488 489 mirror::Class* CreateArrayClass(Thread* self, const char* descriptor, size_t hash, 490 Handle<mirror::ClassLoader> class_loader) 491 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 492 493 void AppendToBootClassPath(Thread* self, const DexFile& dex_file) 494 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 495 void AppendToBootClassPath(const DexFile& dex_file, Handle<mirror::DexCache> dex_cache) 496 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 497 498 // Precomputes size needed for Class, in the case of a non-temporary class this size must be 499 // sufficient to hold all static fields. 500 uint32_t SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 501 const DexFile::ClassDef& dex_class_def); 502 503 void LoadClass(Thread* self, const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 504 Handle<mirror::Class> klass, mirror::ClassLoader* class_loader) 505 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 506 void LoadClassMembers(Thread* self, const DexFile& dex_file, const uint8_t* class_data, 507 Handle<mirror::Class> klass, const OatFile::OatClass* oat_class) 508 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 509 510 void LoadField(const DexFile& dex_file, const ClassDataItemIterator& it, 511 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) 512 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 513 514 mirror::ArtMethod* LoadMethod(Thread* self, const DexFile& dex_file, 515 const ClassDataItemIterator& dex_method, 516 Handle<mirror::Class> klass) 517 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 518 519 void FixupStaticTrampolines(mirror::Class* klass) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 520 521 // Finds the associated oat class for a dex_file and descriptor. Returns an invalid OatClass on 522 // error and sets found to false. 523 OatFile::OatClass FindOatClass(const DexFile& dex_file, uint16_t class_def_idx, bool* found) 524 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 525 526 void RegisterDexFileLocked(const DexFile& dex_file, Handle<mirror::DexCache> dex_cache) 527 EXCLUSIVE_LOCKS_REQUIRED(dex_lock_) 528 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 529 bool IsDexFileRegisteredLocked(const DexFile& dex_file) 530 SHARED_LOCKS_REQUIRED(dex_lock_, Locks::mutator_lock_); 531 532 bool InitializeClass(Thread* self, Handle<mirror::Class> klass, bool can_run_clinit, 533 bool can_init_parents) 534 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 535 bool WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 536 ObjectLock<mirror::Class>& lock); 537 bool ValidateSuperClassDescriptors(Handle<mirror::Class> klass) 538 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 539 540 bool IsSameDescriptorInDifferentClassContexts(Thread* self, const char* descriptor, 541 Handle<mirror::ClassLoader> class_loader1, 542 Handle<mirror::ClassLoader> class_loader2) 543 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 544 545 bool IsSameMethodSignatureInDifferentClassContexts(Thread* self, mirror::ArtMethod* method, 546 mirror::Class* klass1, 547 mirror::Class* klass2) 548 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 549 550 bool LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 551 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 552 mirror::Class** new_class) 553 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 554 555 bool LinkSuperClass(Handle<mirror::Class> klass) 556 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 557 558 bool LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) 559 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 560 561 bool LinkMethods(Thread* self, Handle<mirror::Class> klass, 562 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 563 StackHandleScope<mirror::Class::kImtSize>* out_imt) 564 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 565 566 bool LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) 567 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 568 569 bool LinkInterfaceMethods(Thread* const self, Handle<mirror::Class> klass, 570 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 571 StackHandleScope<mirror::Class::kImtSize>* out_imt) 572 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 573 574 bool LinkStaticFields(Thread* self, Handle<mirror::Class> klass, size_t* class_size) 575 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 576 bool LinkInstanceFields(Thread* self, Handle<mirror::Class> klass) 577 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 578 bool LinkFields(Thread* self, Handle<mirror::Class> klass, bool is_static, size_t* class_size) 579 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 580 void LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 581 uint32_t class_def_method_index) 582 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 583 void CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) 584 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 585 586 // For use by ImageWriter to find DexCaches for its roots 587 ReaderWriterMutex* DexLock() 588 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) LOCK_RETURNED(dex_lock_) { 589 return &dex_lock_; 590 } 591 size_t GetDexCacheCount() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_, dex_lock_) { 592 return dex_caches_.size(); 593 } 594 mirror::DexCache* GetDexCache(size_t idx) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_, dex_lock_); 595 596 const OatFile::OatDexFile* FindOpenedOatDexFileForDexFile(const DexFile& dex_file) 597 LOCKS_EXCLUDED(dex_lock_) 598 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 599 600 // Find an opened oat dex file that contains dex_location. If oat_location is not nullptr, 601 // the file must have that location, else any oat location is accepted. 602 const OatFile::OatDexFile* FindOpenedOatDexFile(const char* oat_location, 603 const char* dex_location, 604 const uint32_t* dex_location_checksum) 605 LOCKS_EXCLUDED(dex_lock_); 606 607 const OatFile* FindOpenedOatFileFromOatLocation(const std::string& oat_location) 608 LOCKS_EXCLUDED(dex_lock_); 609 610 mirror::ArtMethod* CreateProxyConstructor(Thread* self, Handle<mirror::Class> klass, 611 mirror::Class* proxy_class) 612 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 613 mirror::ArtMethod* CreateProxyMethod(Thread* self, Handle<mirror::Class> klass, 614 Handle<mirror::ArtMethod> prototype) 615 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 616 617 // Ensures that methods have the kAccPreverified bit set. We use the kAccPreverfied bit on the 618 // class access flags to determine whether this has been done before. 619 void EnsurePreverifiedMethods(Handle<mirror::Class> c) 620 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 621 622 mirror::Class* LookupClassFromTableLocked(const char* descriptor, 623 mirror::ClassLoader* class_loader, 624 size_t hash) 625 SHARED_LOCKS_REQUIRED(Locks::classlinker_classes_lock_, Locks::mutator_lock_); 626 627 mirror::Class* UpdateClass(const char* descriptor, mirror::Class* klass, size_t hash) 628 LOCKS_EXCLUDED(Locks::classlinker_classes_lock_) 629 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 630 631 mirror::Class* LookupClassFromImage(const char* descriptor) 632 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 633 634 // EnsureResolved is called to make sure that a class in the class_table_ has been resolved 635 // before returning it to the caller. Its the responsibility of the thread that placed the class 636 // in the table to make it resolved. The thread doing resolution must notify on the class' lock 637 // when resolution has occurred. This happens in mirror::Class::SetStatus. As resolution may 638 // retire a class, the version of the class in the table is returned and this may differ from 639 // the class passed in. 640 mirror::Class* EnsureResolved(Thread* self, const char* descriptor, mirror::Class* klass) 641 WARN_UNUSED SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 642 643 void FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) 644 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 645 646 void SetClassRoot(ClassRoot class_root, mirror::Class* klass) 647 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 648 649 // Return the quick generic JNI stub for testing. 650 const void* GetRuntimeQuickGenericJniStub() const; 651 652 std::vector<const DexFile*> boot_class_path_; 653 std::vector<std::unique_ptr<const DexFile>> opened_dex_files_; 654 655 mutable ReaderWriterMutex dex_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER; 656 std::vector<size_t> new_dex_cache_roots_ GUARDED_BY(dex_lock_); 657 std::vector<GcRoot<mirror::DexCache>> dex_caches_ GUARDED_BY(dex_lock_); 658 std::vector<const OatFile*> oat_files_ GUARDED_BY(dex_lock_); 659 660 class ClassDescriptorHashEquals { 661 public: 662 // Same class loader and descriptor. 663 std::size_t operator()(const GcRoot<mirror::Class>& root) const NO_THREAD_SAFETY_ANALYSIS; 664 bool operator()(const GcRoot<mirror::Class>& a, const GcRoot<mirror::Class>& b) const 665 NO_THREAD_SAFETY_ANALYSIS; 666 // Same class loader and descriptor. 667 std::size_t operator()(const std::pair<const char*, mirror::ClassLoader*>& element) const 668 NO_THREAD_SAFETY_ANALYSIS; 669 bool operator()(const GcRoot<mirror::Class>& a, 670 const std::pair<const char*, mirror::ClassLoader*>& b) const 671 NO_THREAD_SAFETY_ANALYSIS; 672 // Same descriptor. 673 bool operator()(const GcRoot<mirror::Class>& a, const char* descriptor) const 674 NO_THREAD_SAFETY_ANALYSIS; 675 std::size_t operator()(const char* descriptor) const NO_THREAD_SAFETY_ANALYSIS; 676 }; 677 class GcRootEmptyFn { 678 public: 679 void MakeEmpty(GcRoot<mirror::Class>& item) const { 680 item = GcRoot<mirror::Class>(); 681 } 682 bool IsEmpty(const GcRoot<mirror::Class>& item) const { 683 return item.IsNull(); 684 } 685 }; 686 687 // hash set which hashes class descriptor, and compares descriptors nad class loaders. Results 688 // should be compared for a matching Class descriptor and class loader. 689 typedef HashSet<GcRoot<mirror::Class>, GcRootEmptyFn, ClassDescriptorHashEquals, 690 ClassDescriptorHashEquals, TrackingAllocator<GcRoot<mirror::Class>, kAllocatorTagClassTable>> 691 Table; 692 // This contains strong roots. To enable concurrent root scanning of 693 // the class table, be careful to use a read barrier when accessing this. 694 Table class_table_ GUARDED_BY(Locks::classlinker_classes_lock_); 695 Table pre_zygote_class_table_ GUARDED_BY(Locks::classlinker_classes_lock_); 696 std::vector<GcRoot<mirror::Class>> new_class_roots_; 697 698 // Do we need to search dex caches to find image classes? 699 bool dex_cache_image_class_lookup_required_; 700 // Number of times we've searched dex caches for a class. After a certain number of misses we move 701 // the classes into the class_table_ to avoid dex cache based searches. 702 Atomic<uint32_t> failed_dex_cache_class_lookups_; 703 704 // Well known mirror::Class roots. 705 GcRoot<mirror::ObjectArray<mirror::Class>> class_roots_; 706 707 // The interface table used by all arrays. 708 GcRoot<mirror::IfTable> array_iftable_; 709 710 // A cache of the last FindArrayClass results. The cache serves to avoid creating array class 711 // descriptors for the sake of performing FindClass. 712 static constexpr size_t kFindArrayCacheSize = 16; 713 GcRoot<mirror::Class> find_array_class_cache_[kFindArrayCacheSize]; 714 size_t find_array_class_cache_next_victim_; 715 716 bool init_done_; 717 bool log_new_dex_caches_roots_ GUARDED_BY(dex_lock_); 718 bool log_new_class_table_roots_ GUARDED_BY(Locks::classlinker_classes_lock_); 719 720 InternTable* intern_table_; 721 722 // Trampolines within the image the bounce to runtime entrypoints. Done so that there is a single 723 // patch point within the image. TODO: make these proper relocations. 724 const void* quick_resolution_trampoline_; 725 const void* quick_imt_conflict_trampoline_; 726 const void* quick_generic_jni_trampoline_; 727 const void* quick_to_interpreter_bridge_trampoline_; 728 729 // Image pointer size. 730 size_t image_pointer_size_; 731 732 friend class ImageWriter; // for GetClassRoots 733 friend class ImageDumper; // for FindOpenedOatFileFromOatLocation 734 friend class JniCompilerTest; // for GetRuntimeQuickGenericJniStub 735 friend class NoDex2OatTest; // for FindOpenedOatFileForDexFile 736 friend class NoPatchoatTest; // for FindOpenedOatFileForDexFile 737 ART_FRIEND_TEST(mirror::DexCacheTest, Open); // for AllocDexCache 738 739 DISALLOW_COPY_AND_ASSIGN(ClassLinker); 740}; 741 742} // namespace art 743 744#endif // ART_RUNTIME_CLASS_LINKER_H_ 745