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 #include "class_linker.h" 18 19 #include <fcntl.h> 20 #include <sys/file.h> 21 #include <sys/stat.h> 22 #include <sys/types.h> 23 #include <sys/wait.h> 24 25 #include <deque> 26 #include <string> 27 #include <utility> 28 #include <vector> 29 30 #include "base/casts.h" 31 #include "base/logging.h" 32 #include "base/stl_util.h" 33 #include "base/unix_file/fd_file.h" 34 #include "class_linker-inl.h" 35 #include "debugger.h" 36 #include "dex_file-inl.h" 37 #include "gc/accounting/card_table-inl.h" 38 #include "gc/accounting/heap_bitmap.h" 39 #include "gc/heap.h" 40 #include "gc/space/image_space.h" 41 #include "intern_table.h" 42 #include "interpreter/interpreter.h" 43 #include "leb128.h" 44 #include "oat.h" 45 #include "oat_file.h" 46 #include "mirror/art_field-inl.h" 47 #include "mirror/art_method-inl.h" 48 #include "mirror/class.h" 49 #include "mirror/class-inl.h" 50 #include "mirror/class_loader.h" 51 #include "mirror/dex_cache-inl.h" 52 #include "mirror/iftable-inl.h" 53 #include "mirror/object-inl.h" 54 #include "mirror/object_array-inl.h" 55 #include "mirror/proxy.h" 56 #include "mirror/stack_trace_element.h" 57 #include "object_utils.h" 58 #include "os.h" 59 #include "runtime.h" 60 #include "entrypoints/entrypoint_utils.h" 61 #include "ScopedLocalRef.h" 62 #include "scoped_thread_state_change.h" 63 #include "sirt_ref.h" 64 #include "stack_indirect_reference_table.h" 65 #include "thread.h" 66 #include "UniquePtr.h" 67 #include "utils.h" 68 #include "verifier/method_verifier.h" 69 #include "well_known_classes.h" 70 71 namespace art { 72 73 static void ThrowNoClassDefFoundError(const char* fmt, ...) 74 __attribute__((__format__(__printf__, 1, 2))) 75 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 76 static void ThrowNoClassDefFoundError(const char* fmt, ...) { 77 va_list args; 78 va_start(args, fmt); 79 Thread* self = Thread::Current(); 80 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 81 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 82 va_end(args); 83 } 84 85 static void ThrowEarlierClassFailure(mirror::Class* c) 86 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 87 // The class failed to initialize on a previous attempt, so we want to throw 88 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 89 // failed in verification, in which case v2 5.4.1 says we need to re-throw 90 // the previous error. 91 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 92 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 93 } 94 95 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 96 Thread* self = Thread::Current(); 97 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 98 if (c->GetVerifyErrorClass() != NULL) { 99 // TODO: change the verifier to store an _instance_, with a useful detail message? 100 ClassHelper ve_ch(c->GetVerifyErrorClass()); 101 self->ThrowNewException(throw_location, ve_ch.GetDescriptor(), PrettyDescriptor(c).c_str()); 102 } else { 103 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 104 PrettyDescriptor(c).c_str()); 105 } 106 } 107 108 static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 109 Thread* self = Thread::Current(); 110 JNIEnv* env = self->GetJniEnv(); 111 112 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 113 CHECK(cause.get() != NULL); 114 115 env->ExceptionClear(); 116 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 117 env->Throw(cause.get()); 118 119 // We only wrap non-Error exceptions; an Error can just be used as-is. 120 if (!is_error) { 121 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 122 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 123 } 124 } 125 126 static size_t Hash(const char* s) { 127 // This is the java.lang.String hashcode for convenience, not interoperability. 128 size_t hash = 0; 129 for (; *s != '\0'; ++s) { 130 hash = hash * 31 + *s; 131 } 132 return hash; 133 } 134 135 const char* ClassLinker::class_roots_descriptors_[] = { 136 "Ljava/lang/Class;", 137 "Ljava/lang/Object;", 138 "[Ljava/lang/Class;", 139 "[Ljava/lang/Object;", 140 "Ljava/lang/String;", 141 "Ljava/lang/DexCache;", 142 "Ljava/lang/ref/Reference;", 143 "Ljava/lang/reflect/ArtField;", 144 "Ljava/lang/reflect/ArtMethod;", 145 "Ljava/lang/reflect/Proxy;", 146 "[Ljava/lang/String;", 147 "[Ljava/lang/reflect/ArtField;", 148 "[Ljava/lang/reflect/ArtMethod;", 149 "Ljava/lang/ClassLoader;", 150 "Ljava/lang/Throwable;", 151 "Ljava/lang/ClassNotFoundException;", 152 "Ljava/lang/StackTraceElement;", 153 "Z", 154 "B", 155 "C", 156 "D", 157 "F", 158 "I", 159 "J", 160 "S", 161 "V", 162 "[Z", 163 "[B", 164 "[C", 165 "[D", 166 "[F", 167 "[I", 168 "[J", 169 "[S", 170 "[Ljava/lang/StackTraceElement;", 171 }; 172 173 ClassLinker* ClassLinker::CreateFromCompiler(const std::vector<const DexFile*>& boot_class_path, 174 InternTable* intern_table) { 175 CHECK_NE(boot_class_path.size(), 0U); 176 UniquePtr<ClassLinker> class_linker(new ClassLinker(intern_table)); 177 class_linker->InitFromCompiler(boot_class_path); 178 return class_linker.release(); 179 } 180 181 ClassLinker* ClassLinker::CreateFromImage(InternTable* intern_table) { 182 UniquePtr<ClassLinker> class_linker(new ClassLinker(intern_table)); 183 class_linker->InitFromImage(); 184 return class_linker.release(); 185 } 186 187 ClassLinker::ClassLinker(InternTable* intern_table) 188 // dex_lock_ is recursive as it may be used in stack dumping. 189 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 190 dex_cache_image_class_lookup_required_(false), 191 failed_dex_cache_class_lookups_(0), 192 class_roots_(NULL), 193 array_iftable_(NULL), 194 init_done_(false), 195 dex_caches_dirty_(false), 196 class_table_dirty_(false), 197 intern_table_(intern_table), 198 portable_resolution_trampoline_(NULL), 199 quick_resolution_trampoline_(NULL) { 200 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 201 } 202 203 void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 204 VLOG(startup) << "ClassLinker::Init"; 205 CHECK(Runtime::Current()->IsCompiler()); 206 207 CHECK(!init_done_); 208 209 // java_lang_Class comes first, it's needed for AllocClass 210 Thread* self = Thread::Current(); 211 gc::Heap* heap = Runtime::Current()->GetHeap(); 212 SirtRef<mirror::Class> 213 java_lang_Class(self, 214 down_cast<mirror::Class*>(heap->AllocObject(self, NULL, 215 sizeof(mirror::ClassClass)))); 216 CHECK(java_lang_Class.get() != NULL); 217 mirror::Class::SetClassClass(java_lang_Class.get()); 218 java_lang_Class->SetClass(java_lang_Class.get()); 219 java_lang_Class->SetClassSize(sizeof(mirror::ClassClass)); 220 // AllocClass(mirror::Class*) can now be used 221 222 // Class[] is used for reflection support. 223 SirtRef<mirror::Class> class_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 224 class_array_class->SetComponentType(java_lang_Class.get()); 225 226 // java_lang_Object comes next so that object_array_class can be created. 227 SirtRef<mirror::Class> java_lang_Object(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 228 CHECK(java_lang_Object.get() != NULL); 229 // backfill Object as the super class of Class. 230 java_lang_Class->SetSuperClass(java_lang_Object.get()); 231 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 232 233 // Object[] next to hold class roots. 234 SirtRef<mirror::Class> object_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 235 object_array_class->SetComponentType(java_lang_Object.get()); 236 237 // Setup the char class to be used for char[]. 238 SirtRef<mirror::Class> char_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 239 240 // Setup the char[] class to be used for String. 241 SirtRef<mirror::Class> char_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 242 char_array_class->SetComponentType(char_class.get()); 243 mirror::CharArray::SetArrayClass(char_array_class.get()); 244 245 // Setup String. 246 SirtRef<mirror::Class> java_lang_String(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::StringClass))); 247 mirror::String::SetClass(java_lang_String.get()); 248 java_lang_String->SetObjectSize(sizeof(mirror::String)); 249 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 250 251 // Create storage for root classes, save away our work so far (requires descriptors). 252 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.get(), kClassRootsMax); 253 CHECK(class_roots_ != NULL); 254 SetClassRoot(kJavaLangClass, java_lang_Class.get()); 255 SetClassRoot(kJavaLangObject, java_lang_Object.get()); 256 SetClassRoot(kClassArrayClass, class_array_class.get()); 257 SetClassRoot(kObjectArrayClass, object_array_class.get()); 258 SetClassRoot(kCharArrayClass, char_array_class.get()); 259 SetClassRoot(kJavaLangString, java_lang_String.get()); 260 261 // Setup the primitive type classes. 262 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 263 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 264 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 265 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 266 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 267 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 268 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 269 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 270 271 // Create array interface entries to populate once we can load system classes. 272 array_iftable_ = AllocIfTable(self, 2); 273 274 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 275 SirtRef<mirror::Class> int_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 276 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 277 mirror::IntArray::SetArrayClass(int_array_class.get()); 278 SetClassRoot(kIntArrayClass, int_array_class.get()); 279 280 // now that these are registered, we can use AllocClass() and AllocObjectArray 281 282 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 283 SirtRef<mirror::Class> 284 java_lang_DexCache(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::DexCacheClass))); 285 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.get()); 286 java_lang_DexCache->SetObjectSize(sizeof(mirror::DexCacheClass)); 287 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 288 289 // Constructor, Field, Method, and AbstractMethod are necessary so that FindClass can link members. 290 SirtRef<mirror::Class> java_lang_reflect_ArtField(self, AllocClass(self, java_lang_Class.get(), 291 sizeof(mirror::ArtFieldClass))); 292 CHECK(java_lang_reflect_ArtField.get() != NULL); 293 java_lang_reflect_ArtField->SetObjectSize(sizeof(mirror::ArtField)); 294 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.get()); 295 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 296 mirror::ArtField::SetClass(java_lang_reflect_ArtField.get()); 297 298 SirtRef<mirror::Class> java_lang_reflect_ArtMethod(self, AllocClass(self, java_lang_Class.get(), 299 sizeof(mirror::ArtMethodClass))); 300 CHECK(java_lang_reflect_ArtMethod.get() != NULL); 301 java_lang_reflect_ArtMethod->SetObjectSize(sizeof(mirror::ArtMethod)); 302 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.get()); 303 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 304 305 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.get()); 306 307 // Set up array classes for string, field, method 308 SirtRef<mirror::Class> object_array_string(self, AllocClass(self, java_lang_Class.get(), 309 sizeof(mirror::Class))); 310 object_array_string->SetComponentType(java_lang_String.get()); 311 SetClassRoot(kJavaLangStringArrayClass, object_array_string.get()); 312 313 SirtRef<mirror::Class> object_array_art_method(self, AllocClass(self, java_lang_Class.get(), 314 sizeof(mirror::Class))); 315 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.get()); 316 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.get()); 317 318 SirtRef<mirror::Class> object_array_art_field(self, AllocClass(self, java_lang_Class.get(), 319 sizeof(mirror::Class))); 320 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.get()); 321 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.get()); 322 323 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 324 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 325 // these roots. 326 CHECK_NE(0U, boot_class_path.size()); 327 for (size_t i = 0; i != boot_class_path.size(); ++i) { 328 const DexFile* dex_file = boot_class_path[i]; 329 CHECK(dex_file != NULL); 330 AppendToBootClassPath(*dex_file); 331 } 332 333 // now we can use FindSystemClass 334 335 // run char class through InitializePrimitiveClass to finish init 336 InitializePrimitiveClass(char_class.get(), Primitive::kPrimChar); 337 SetClassRoot(kPrimitiveChar, char_class.get()); // needs descriptor 338 339 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 340 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 341 mirror::Class* Object_class = FindSystemClass("Ljava/lang/Object;"); 342 CHECK_EQ(java_lang_Object.get(), Object_class); 343 CHECK_EQ(java_lang_Object->GetObjectSize(), sizeof(mirror::Object)); 344 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 345 mirror::Class* String_class = FindSystemClass("Ljava/lang/String;"); 346 CHECK_EQ(java_lang_String.get(), String_class); 347 CHECK_EQ(java_lang_String->GetObjectSize(), sizeof(mirror::String)); 348 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 349 mirror::Class* DexCache_class = FindSystemClass("Ljava/lang/DexCache;"); 350 CHECK_EQ(java_lang_String.get(), String_class); 351 CHECK_EQ(java_lang_DexCache.get(), DexCache_class); 352 CHECK_EQ(java_lang_DexCache->GetObjectSize(), sizeof(mirror::DexCache)); 353 354 // Setup the primitive array type classes - can't be done until Object has a vtable. 355 SetClassRoot(kBooleanArrayClass, FindSystemClass("[Z")); 356 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 357 358 SetClassRoot(kByteArrayClass, FindSystemClass("[B")); 359 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 360 361 mirror::Class* found_char_array_class = FindSystemClass("[C"); 362 CHECK_EQ(char_array_class.get(), found_char_array_class); 363 364 SetClassRoot(kShortArrayClass, FindSystemClass("[S")); 365 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 366 367 mirror::Class* found_int_array_class = FindSystemClass("[I"); 368 CHECK_EQ(int_array_class.get(), found_int_array_class); 369 370 SetClassRoot(kLongArrayClass, FindSystemClass("[J")); 371 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 372 373 SetClassRoot(kFloatArrayClass, FindSystemClass("[F")); 374 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 375 376 SetClassRoot(kDoubleArrayClass, FindSystemClass("[D")); 377 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 378 379 mirror::Class* found_class_array_class = FindSystemClass("[Ljava/lang/Class;"); 380 CHECK_EQ(class_array_class.get(), found_class_array_class); 381 382 mirror::Class* found_object_array_class = FindSystemClass("[Ljava/lang/Object;"); 383 CHECK_EQ(object_array_class.get(), found_object_array_class); 384 385 // Setup the single, global copy of "iftable". 386 mirror::Class* java_lang_Cloneable = FindSystemClass("Ljava/lang/Cloneable;"); 387 CHECK(java_lang_Cloneable != NULL); 388 mirror::Class* java_io_Serializable = FindSystemClass("Ljava/io/Serializable;"); 389 CHECK(java_io_Serializable != NULL); 390 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 391 // crawl up and explicitly list all of the supers as well. 392 array_iftable_->SetInterface(0, java_lang_Cloneable); 393 array_iftable_->SetInterface(1, java_io_Serializable); 394 395 // Sanity check Class[] and Object[]'s interfaces. 396 ClassHelper kh(class_array_class.get(), this); 397 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 398 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 399 kh.ChangeClass(object_array_class.get()); 400 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 401 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 402 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 403 // dex_cache_ fields and register them in class_table_. 404 mirror::Class* Class_class = FindSystemClass("Ljava/lang/Class;"); 405 CHECK_EQ(java_lang_Class.get(), Class_class); 406 407 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 408 mirror::Class* Art_method_class = FindSystemClass("Ljava/lang/reflect/ArtMethod;"); 409 CHECK_EQ(java_lang_reflect_ArtMethod.get(), Art_method_class); 410 411 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 412 mirror::Class* Art_field_class = FindSystemClass("Ljava/lang/reflect/ArtField;"); 413 CHECK_EQ(java_lang_reflect_ArtField.get(), Art_field_class); 414 415 mirror::Class* String_array_class = FindSystemClass(class_roots_descriptors_[kJavaLangStringArrayClass]); 416 CHECK_EQ(object_array_string.get(), String_array_class); 417 418 mirror::Class* Art_method_array_class = 419 FindSystemClass(class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 420 CHECK_EQ(object_array_art_method.get(), Art_method_array_class); 421 422 mirror::Class* Art_field_array_class = 423 FindSystemClass(class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 424 CHECK_EQ(object_array_art_field.get(), Art_field_array_class); 425 426 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 427 428 // Create java.lang.reflect.Proxy root. 429 mirror::Class* java_lang_reflect_Proxy = FindSystemClass("Ljava/lang/reflect/Proxy;"); 430 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 431 432 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 433 mirror::Class* java_lang_ref_Reference = FindSystemClass("Ljava/lang/ref/Reference;"); 434 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference); 435 mirror::Class* java_lang_ref_FinalizerReference = FindSystemClass("Ljava/lang/ref/FinalizerReference;"); 436 java_lang_ref_FinalizerReference->SetAccessFlags( 437 java_lang_ref_FinalizerReference->GetAccessFlags() | 438 kAccClassIsReference | kAccClassIsFinalizerReference); 439 mirror::Class* java_lang_ref_PhantomReference = FindSystemClass("Ljava/lang/ref/PhantomReference;"); 440 java_lang_ref_PhantomReference->SetAccessFlags( 441 java_lang_ref_PhantomReference->GetAccessFlags() | 442 kAccClassIsReference | kAccClassIsPhantomReference); 443 mirror::Class* java_lang_ref_SoftReference = FindSystemClass("Ljava/lang/ref/SoftReference;"); 444 java_lang_ref_SoftReference->SetAccessFlags( 445 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 446 mirror::Class* java_lang_ref_WeakReference = FindSystemClass("Ljava/lang/ref/WeakReference;"); 447 java_lang_ref_WeakReference->SetAccessFlags( 448 java_lang_ref_WeakReference->GetAccessFlags() | 449 kAccClassIsReference | kAccClassIsWeakReference); 450 451 // Setup the ClassLoader, verifying the object_size_. 452 mirror::Class* java_lang_ClassLoader = FindSystemClass("Ljava/lang/ClassLoader;"); 453 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), sizeof(mirror::ClassLoader)); 454 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 455 456 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 457 // java.lang.StackTraceElement as a convenience. 458 SetClassRoot(kJavaLangThrowable, FindSystemClass("Ljava/lang/Throwable;")); 459 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 460 SetClassRoot(kJavaLangClassNotFoundException, FindSystemClass("Ljava/lang/ClassNotFoundException;")); 461 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass("Ljava/lang/StackTraceElement;")); 462 SetClassRoot(kJavaLangStackTraceElementArrayClass, FindSystemClass("[Ljava/lang/StackTraceElement;")); 463 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 464 465 FinishInit(); 466 467 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 468 } 469 470 void ClassLinker::FinishInit() { 471 VLOG(startup) << "ClassLinker::FinishInit entering"; 472 473 // Let the heap know some key offsets into java.lang.ref instances 474 // Note: we hard code the field indexes here rather than using FindInstanceField 475 // as the types of the field can't be resolved prior to the runtime being 476 // fully initialized 477 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 478 mirror::Class* java_lang_ref_FinalizerReference = 479 FindSystemClass("Ljava/lang/ref/FinalizerReference;"); 480 481 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 482 FieldHelper fh(pendingNext, this); 483 CHECK_STREQ(fh.GetName(), "pendingNext"); 484 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 485 486 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 487 fh.ChangeField(queue); 488 CHECK_STREQ(fh.GetName(), "queue"); 489 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 490 491 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 492 fh.ChangeField(queueNext); 493 CHECK_STREQ(fh.GetName(), "queueNext"); 494 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 495 496 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 497 fh.ChangeField(referent); 498 CHECK_STREQ(fh.GetName(), "referent"); 499 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 500 501 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 502 fh.ChangeField(zombie); 503 CHECK_STREQ(fh.GetName(), "zombie"); 504 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 505 506 gc::Heap* heap = Runtime::Current()->GetHeap(); 507 heap->SetReferenceOffsets(referent->GetOffset(), 508 queue->GetOffset(), 509 queueNext->GetOffset(), 510 pendingNext->GetOffset(), 511 zombie->GetOffset()); 512 513 // ensure all class_roots_ are initialized 514 for (size_t i = 0; i < kClassRootsMax; i++) { 515 ClassRoot class_root = static_cast<ClassRoot>(i); 516 mirror::Class* klass = GetClassRoot(class_root); 517 CHECK(klass != NULL); 518 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 519 // note SetClassRoot does additional validation. 520 // if possible add new checks there to catch errors early 521 } 522 523 CHECK(array_iftable_ != NULL); 524 525 // disable the slow paths in FindClass and CreatePrimitiveClass now 526 // that Object, Class, and Object[] are setup 527 init_done_ = true; 528 529 VLOG(startup) << "ClassLinker::FinishInit exiting"; 530 } 531 532 void ClassLinker::RunRootClinits() { 533 Thread* self = Thread::Current(); 534 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 535 mirror::Class* c = GetClassRoot(ClassRoot(i)); 536 if (!c->IsArrayClass() && !c->IsPrimitive()) { 537 EnsureInitialized(GetClassRoot(ClassRoot(i)), true, true); 538 self->AssertNoPendingException(); 539 } 540 } 541 } 542 543 bool ClassLinker::GenerateOatFile(const std::string& dex_filename, 544 int oat_fd, 545 const std::string& oat_cache_filename) { 546 std::string dex2oat_string(GetAndroidRoot()); 547 dex2oat_string += (kIsDebugBuild ? "/bin/dex2oatd" : "/bin/dex2oat"); 548 const char* dex2oat = dex2oat_string.c_str(); 549 550 const char* class_path = Runtime::Current()->GetClassPathString().c_str(); 551 552 gc::Heap* heap = Runtime::Current()->GetHeap(); 553 std::string boot_image_option_string("--boot-image="); 554 boot_image_option_string += heap->GetImageSpace()->GetImageFilename(); 555 const char* boot_image_option = boot_image_option_string.c_str(); 556 557 std::string dex_file_option_string("--dex-file="); 558 dex_file_option_string += dex_filename; 559 const char* dex_file_option = dex_file_option_string.c_str(); 560 561 std::string oat_fd_option_string("--oat-fd="); 562 StringAppendF(&oat_fd_option_string, "%d", oat_fd); 563 const char* oat_fd_option = oat_fd_option_string.c_str(); 564 565 std::string oat_location_option_string("--oat-location="); 566 oat_location_option_string += oat_cache_filename; 567 const char* oat_location_option = oat_location_option_string.c_str(); 568 569 std::string oat_compiler_filter_string("-compiler-filter:"); 570 switch (Runtime::Current()->GetCompilerFilter()) { 571 case Runtime::kInterpretOnly: 572 oat_compiler_filter_string += "interpret-only"; 573 break; 574 case Runtime::kSpace: 575 oat_compiler_filter_string += "space"; 576 break; 577 case Runtime::kBalanced: 578 oat_compiler_filter_string += "balanced"; 579 break; 580 case Runtime::kSpeed: 581 oat_compiler_filter_string += "speed"; 582 break; 583 case Runtime::kEverything: 584 oat_compiler_filter_string += "everything"; 585 break; 586 default: 587 LOG(FATAL) << "Unexpected case."; 588 } 589 const char* oat_compiler_filter_option = oat_compiler_filter_string.c_str(); 590 591 // fork and exec dex2oat 592 pid_t pid = fork(); 593 if (pid == 0) { 594 // no allocation allowed between fork and exec 595 596 // change process groups, so we don't get reaped by ProcessManager 597 setpgid(0, 0); 598 599 // gLogVerbosity.class_linker = true; 600 VLOG(class_linker) << dex2oat 601 << " --runtime-arg -Xms64m" 602 << " --runtime-arg -Xmx64m" 603 << " --runtime-arg -classpath" 604 << " --runtime-arg " << class_path 605 << " --runtime-arg " << oat_compiler_filter_option 606 #if !defined(ART_TARGET) 607 << " --host" 608 #endif 609 << " " << boot_image_option 610 << " " << dex_file_option 611 << " " << oat_fd_option 612 << " " << oat_location_option; 613 614 execl(dex2oat, dex2oat, 615 "--runtime-arg", "-Xms64m", 616 "--runtime-arg", "-Xmx64m", 617 "--runtime-arg", "-classpath", 618 "--runtime-arg", class_path, 619 "--runtime-arg", oat_compiler_filter_option, 620 #if !defined(ART_TARGET) 621 "--host", 622 #endif 623 boot_image_option, 624 dex_file_option, 625 oat_fd_option, 626 oat_location_option, 627 NULL); 628 629 PLOG(FATAL) << "execl(" << dex2oat << ") failed"; 630 return false; 631 } else { 632 // wait for dex2oat to finish 633 int status; 634 pid_t got_pid = TEMP_FAILURE_RETRY(waitpid(pid, &status, 0)); 635 if (got_pid != pid) { 636 PLOG(ERROR) << "waitpid failed: wanted " << pid << ", got " << got_pid; 637 return false; 638 } 639 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { 640 LOG(ERROR) << dex2oat << " failed with dex-file=" << dex_filename; 641 return false; 642 } 643 } 644 return true; 645 } 646 647 void ClassLinker::RegisterOatFile(const OatFile& oat_file) { 648 WriterMutexLock mu(Thread::Current(), dex_lock_); 649 RegisterOatFileLocked(oat_file); 650 } 651 652 void ClassLinker::RegisterOatFileLocked(const OatFile& oat_file) { 653 dex_lock_.AssertExclusiveHeld(Thread::Current()); 654 if (kIsDebugBuild) { 655 for (size_t i = 0; i < oat_files_.size(); ++i) { 656 CHECK_NE(&oat_file, oat_files_[i]) << oat_file.GetLocation(); 657 } 658 } 659 VLOG(class_linker) << "Registering " << oat_file.GetLocation(); 660 oat_files_.push_back(&oat_file); 661 } 662 663 OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 664 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 665 OatFile& oat_file = space->ReleaseOatFile(); 666 WriterMutexLock mu(Thread::Current(), dex_lock_); 667 RegisterOatFileLocked(oat_file); 668 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 669 return oat_file; 670 } 671 672 const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 673 ReaderMutexLock mu(Thread::Current(), dex_lock_); 674 return FindOpenedOatFileFromDexLocation(dex_file.GetLocation(), dex_file.GetLocationChecksum()); 675 } 676 677 const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation(const std::string& dex_location, 678 uint32_t dex_location_checksum) { 679 for (size_t i = 0; i < oat_files_.size(); i++) { 680 const OatFile* oat_file = oat_files_[i]; 681 DCHECK(oat_file != NULL); 682 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 683 &dex_location_checksum, 684 false); 685 if (oat_dex_file != NULL) { 686 return oat_file; 687 } 688 } 689 return NULL; 690 } 691 692 const DexFile* ClassLinker::FindDexFileInOatLocation(const std::string& dex_location, 693 uint32_t dex_location_checksum, 694 const std::string& oat_location) { 695 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 696 !Runtime::Current()->IsCompiler())); 697 if (oat_file.get() == NULL) { 698 VLOG(class_linker) << "Failed to find existing oat file at " << oat_location; 699 return NULL; 700 } 701 Runtime* runtime = Runtime::Current(); 702 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 703 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 704 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 705 if (expected_image_oat_checksum != actual_image_oat_checksum) { 706 VLOG(class_linker) << "Failed to find oat file at " << oat_location 707 << " with expected image oat checksum of " << expected_image_oat_checksum 708 << ", found " << actual_image_oat_checksum; 709 return NULL; 710 } 711 712 uint32_t expected_image_oat_offset = reinterpret_cast<uint32_t>(image_header.GetOatDataBegin()); 713 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 714 if (expected_image_oat_offset != actual_image_oat_offset) { 715 VLOG(class_linker) << "Failed to find oat file at " << oat_location 716 << " with expected image oat offset " << expected_image_oat_offset 717 << ", found " << actual_image_oat_offset; 718 return NULL; 719 } 720 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 721 if (oat_dex_file == NULL) { 722 VLOG(class_linker) << "Failed to find oat file at " << oat_location << " containing " << dex_location; 723 return NULL; 724 } 725 uint32_t expected_dex_checksum = dex_location_checksum; 726 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 727 if (expected_dex_checksum != actual_dex_checksum) { 728 VLOG(class_linker) << "Failed to find oat file at " << oat_location 729 << " with expected dex checksum of " << expected_dex_checksum 730 << ", found " << actual_dex_checksum; 731 return NULL; 732 } 733 RegisterOatFileLocked(*oat_file.release()); 734 return oat_dex_file->OpenDexFile(); 735 } 736 737 const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation(const std::string& dex_location, 738 uint32_t dex_location_checksum, 739 const std::string& oat_location) { 740 WriterMutexLock mu(Thread::Current(), dex_lock_); 741 return FindOrCreateOatFileForDexLocationLocked(dex_location, dex_location_checksum, oat_location); 742 } 743 744 class ScopedFlock { 745 public: 746 ScopedFlock() {} 747 748 bool Init(const std::string& filename) { 749 while (true) { 750 file_.reset(OS::OpenFileWithFlags(filename.c_str(), O_CREAT | O_RDWR)); 751 if (file_.get() == NULL) { 752 LOG(ERROR) << "Failed to open file: " << filename; 753 return false; 754 } 755 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_EX)); 756 if (flock_result != 0) { 757 PLOG(ERROR) << "Failed to lock file: " << filename; 758 return false; 759 } 760 struct stat fstat_stat; 761 int fstat_result = TEMP_FAILURE_RETRY(fstat(file_->Fd(), &fstat_stat)); 762 if (fstat_result != 0) { 763 PLOG(ERROR) << "Failed to fstat: " << filename; 764 return false; 765 } 766 struct stat stat_stat; 767 int stat_result = TEMP_FAILURE_RETRY(stat(filename.c_str(), &stat_stat)); 768 if (stat_result != 0) { 769 PLOG(WARNING) << "Failed to stat, will retry: " << filename; 770 // ENOENT can happen if someone racing with us unlinks the file we created so just retry. 771 continue; 772 } 773 if (fstat_stat.st_dev != stat_stat.st_dev || fstat_stat.st_ino != stat_stat.st_ino) { 774 LOG(WARNING) << "File changed while locking, will retry: " << filename; 775 continue; 776 } 777 return true; 778 } 779 } 780 781 File& GetFile() { 782 return *file_; 783 } 784 785 ~ScopedFlock() { 786 if (file_.get() != NULL) { 787 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_UN)); 788 CHECK_EQ(0, flock_result); 789 } 790 } 791 792 private: 793 UniquePtr<File> file_; 794 795 DISALLOW_COPY_AND_ASSIGN(ScopedFlock); 796 }; 797 798 const DexFile* ClassLinker::FindOrCreateOatFileForDexLocationLocked(const std::string& dex_location, 799 uint32_t dex_location_checksum, 800 const std::string& oat_location) { 801 // We play a locking game here so that if two different processes 802 // race to generate (or worse, one tries to open a partial generated 803 // file) we will be okay. This is actually common with apps that use 804 // DexClassLoader to work around the dex method reference limit and 805 // that have a background service running in a separate process. 806 ScopedFlock scoped_flock; 807 if (!scoped_flock.Init(oat_location)) { 808 LOG(ERROR) << "Failed to open locked oat file: " << oat_location; 809 return NULL; 810 } 811 812 // Check if we already have an up-to-date output file 813 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, 814 dex_location_checksum, 815 oat_location); 816 if (dex_file != NULL) { 817 return dex_file; 818 } 819 820 // Generate the output oat file for the dex file 821 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 822 if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location)) { 823 LOG(ERROR) << "Failed to generate oat file: " << oat_location; 824 return NULL; 825 } 826 const OatFile* oat_file = OatFile::Open(oat_location, oat_location, NULL, 827 !Runtime::Current()->IsCompiler()); 828 if (oat_file == NULL) { 829 LOG(ERROR) << "Failed to open generated oat file: " << oat_location; 830 return NULL; 831 } 832 RegisterOatFileLocked(*oat_file); 833 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 834 if (oat_dex_file == NULL) { 835 LOG(ERROR) << "Failed to find dex file " << dex_location 836 << " (checksum " << dex_location_checksum 837 << ") in generated oat file: " << oat_location; 838 return NULL; 839 } 840 const DexFile* result = oat_dex_file->OpenDexFile(); 841 CHECK_EQ(dex_location_checksum, result->GetLocationChecksum()) 842 << "dex_location=" << dex_location << " oat_location=" << oat_location << std::hex 843 << " dex_location_checksum=" << dex_location_checksum 844 << " DexFile::GetLocationChecksum()=" << result->GetLocationChecksum(); 845 return result; 846 } 847 848 bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 849 const std::string& dex_location, 850 uint32_t dex_location_checksum) { 851 Runtime* runtime = Runtime::Current(); 852 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 853 uint32_t image_oat_checksum = image_header.GetOatChecksum(); 854 uint32_t image_oat_data_begin = reinterpret_cast<uint32_t>(image_header.GetOatDataBegin()); 855 bool image_check = ((oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum) 856 && (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 857 858 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 859 if (oat_dex_file == NULL) { 860 LOG(ERROR) << "oat file " << oat_file->GetLocation() 861 << " does not contain contents for " << dex_location 862 << " with checksum " << dex_location_checksum; 863 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 864 for (size_t i = 0; i < oat_dex_files.size(); i++) { 865 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 866 LOG(ERROR) << "oat file " << oat_file->GetLocation() 867 << " contains contents for " << oat_dex_file->GetDexFileLocation(); 868 } 869 return false; 870 } 871 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 872 873 if (image_check && dex_check) { 874 return true; 875 } 876 877 if (!image_check) { 878 std::string image_file(image_header.GetImageRoot( 879 ImageHeader::kOatLocation)->AsString()->ToModifiedUtf8()); 880 LOG(WARNING) << "oat file " << oat_file->GetLocation() 881 << " mismatch (" << std::hex << oat_file->GetOatHeader().GetImageFileLocationOatChecksum() 882 << ", " << oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() 883 << ") with " << image_file 884 << " (" << image_oat_checksum << ", " << std::hex << image_oat_data_begin << ")"; 885 } 886 if (!dex_check) { 887 LOG(WARNING) << "oat file " << oat_file->GetLocation() 888 << " mismatch (" << std::hex << oat_dex_file->GetDexFileLocationChecksum() 889 << ") with " << dex_location 890 << " (" << std::hex << dex_location_checksum << ")"; 891 } 892 return false; 893 } 894 895 const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const OatFile* oat_file, 896 const std::string& dex_location, 897 uint32_t dex_location_checksum) { 898 bool verified = VerifyOatFileChecksums(oat_file, dex_location, dex_location_checksum); 899 if (!verified) { 900 delete oat_file; 901 return NULL; 902 } 903 RegisterOatFileLocked(*oat_file); 904 return oat_file->GetOatDexFile(dex_location, &dex_location_checksum)->OpenDexFile(); 905 } 906 907 const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const std::string& dex_location, 908 uint32_t dex_location_checksum) { 909 WriterMutexLock mu(Thread::Current(), dex_lock_); 910 911 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location, 912 dex_location_checksum); 913 if (open_oat_file != NULL) { 914 return open_oat_file->GetOatDexFile(dex_location, &dex_location_checksum)->OpenDexFile(); 915 } 916 917 // Look for an existing file next to dex. for example, for 918 // /foo/bar/baz.jar, look for /foo/bar/baz.odex. 919 std::string odex_filename(OatFile::DexFilenameToOdexFilename(dex_location)); 920 UniquePtr<const OatFile> oat_file(FindOatFileFromOatLocationLocked(odex_filename)); 921 if (oat_file.get() != NULL) { 922 uint32_t dex_location_checksum; 923 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum)) { 924 // If no classes.dex found in dex_location, it has been stripped, assume oat is up-to-date. 925 // This is the common case in user builds for jar's and apk's in the /system directory. 926 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 927 CHECK(oat_dex_file != NULL) << odex_filename << " " << dex_location; 928 RegisterOatFileLocked(*oat_file); 929 return oat_dex_file->OpenDexFile(); 930 } 931 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(oat_file.release(), 932 dex_location, 933 dex_location_checksum); 934 if (dex_file != NULL) { 935 return dex_file; 936 } 937 } 938 // Look for an existing file in the dalvik-cache, validating the result if found 939 // not found in /foo/bar/baz.odex? try /data/dalvik-cache/foo@bar (at) baz.jar@classes.dex 940 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location)); 941 oat_file.reset(FindOatFileFromOatLocationLocked(cache_location)); 942 if (oat_file.get() != NULL) { 943 uint32_t dex_location_checksum; 944 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum)) { 945 LOG(WARNING) << "Failed to compute checksum: " << dex_location; 946 return NULL; 947 } 948 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(oat_file.release(), 949 dex_location, 950 dex_location_checksum); 951 if (dex_file != NULL) { 952 return dex_file; 953 } 954 if (TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 955 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 956 } 957 } 958 LOG(INFO) << "Failed to open oat file from " << odex_filename << " or " << cache_location << "."; 959 960 // Try to generate oat file if it wasn't found or was obsolete. 961 std::string oat_cache_filename(GetDalvikCacheFilenameOrDie(dex_location)); 962 return FindOrCreateOatFileForDexLocationLocked(dex_location, dex_location_checksum, oat_cache_filename); 963 } 964 965 const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 966 for (size_t i = 0; i < oat_files_.size(); i++) { 967 const OatFile* oat_file = oat_files_[i]; 968 DCHECK(oat_file != NULL); 969 if (oat_file->GetLocation() == oat_location) { 970 return oat_file; 971 } 972 } 973 return NULL; 974 } 975 976 const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location) { 977 ReaderMutexLock mu(Thread::Current(), dex_lock_); 978 return FindOatFileFromOatLocationLocked(oat_location); 979 } 980 981 const OatFile* ClassLinker::FindOatFileFromOatLocationLocked(const std::string& oat_location) { 982 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 983 if (oat_file != NULL) { 984 return oat_file; 985 } 986 987 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler()); 988 if (oat_file == NULL) { 989 return NULL; 990 } 991 return oat_file; 992 } 993 994 static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 995 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 996 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 997 998 DCHECK(obj != NULL); 999 DCHECK(class_linker != NULL); 1000 1001 if (obj->IsArtMethod()) { 1002 mirror::ArtMethod* method = obj->AsArtMethod(); 1003 if (!method->IsNative()) { 1004 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1005 if (method != Runtime::Current()->GetResolutionMethod()) { 1006 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1007 } 1008 } 1009 } 1010 } 1011 1012 void ClassLinker::InitFromImage() { 1013 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1014 CHECK(!init_done_); 1015 1016 gc::Heap* heap = Runtime::Current()->GetHeap(); 1017 gc::space::ImageSpace* space = heap->GetImageSpace(); 1018 dex_cache_image_class_lookup_required_ = true; 1019 CHECK(space != NULL); 1020 OatFile& oat_file = GetImageOatFile(space); 1021 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1022 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1023 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 1024 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1025 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1026 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1027 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1028 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1029 1030 mirror::ObjectArray<mirror::Class>* class_roots = 1031 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>(); 1032 class_roots_ = class_roots; 1033 1034 // Special case of setting up the String class early so that we can test arbitrary objects 1035 // as being Strings or not 1036 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1037 1038 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1039 static_cast<uint32_t>(dex_caches->GetLength())); 1040 Thread* self = Thread::Current(); 1041 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1042 SirtRef<mirror::DexCache> dex_cache(self, dex_caches->Get(i)); 1043 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1044 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location, NULL); 1045 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1046 const DexFile* dex_file = oat_dex_file->OpenDexFile(); 1047 if (dex_file == NULL) { 1048 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1049 << " from within oat file " << oat_file.GetLocation(); 1050 } 1051 1052 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1053 1054 AppendToBootClassPath(*dex_file, dex_cache); 1055 } 1056 1057 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1058 // bitmap walk. 1059 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1060 1061 // Set entry point to interpreter if in InterpretOnly mode. 1062 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1063 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1064 heap->FlushAllocStack(); 1065 heap->GetLiveBitmap()->Walk(InitFromImageInterpretOnlyCallback, this); 1066 } 1067 1068 // reinit class_roots_ 1069 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1070 class_roots_ = class_roots; 1071 1072 // reinit array_iftable_ from any array class instance, they should be == 1073 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1074 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1075 // String class root was set above 1076 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1077 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1078 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1079 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1080 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1081 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1082 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1083 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1084 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1085 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1086 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1087 1088 FinishInit(); 1089 1090 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1091 } 1092 1093 // Keep in sync with InitCallback. Anything we visit, we need to 1094 // reinit references to when reinitializing a ClassLinker from a 1095 // mapped image. 1096 void ClassLinker::VisitRoots(RootVisitor* visitor, void* arg, bool only_dirty, bool clean_dirty) { 1097 visitor(class_roots_, arg); 1098 Thread* self = Thread::Current(); 1099 { 1100 ReaderMutexLock mu(self, dex_lock_); 1101 if (!only_dirty || dex_caches_dirty_) { 1102 for (mirror::DexCache* dex_cache : dex_caches_) { 1103 visitor(dex_cache, arg); 1104 } 1105 if (clean_dirty) { 1106 dex_caches_dirty_ = false; 1107 } 1108 } 1109 } 1110 1111 { 1112 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 1113 if (!only_dirty || class_table_dirty_) { 1114 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 1115 visitor(it.second, arg); 1116 } 1117 if (clean_dirty) { 1118 class_table_dirty_ = false; 1119 } 1120 } 1121 1122 // We deliberately ignore the class roots in the image since we 1123 // handle image roots by using the MS/CMS rescanning of dirty cards. 1124 } 1125 1126 visitor(array_iftable_, arg); 1127 } 1128 1129 void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1130 if (dex_cache_image_class_lookup_required_) { 1131 MoveImageClassesToClassTable(); 1132 } 1133 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1134 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 1135 if (!visitor(it.second, arg)) { 1136 return; 1137 } 1138 } 1139 } 1140 1141 static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1142 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1143 classes->insert(c); 1144 return true; 1145 } 1146 1147 void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1148 std::set<mirror::Class*> classes; 1149 VisitClasses(GetClassesVisitor, &classes); 1150 for (mirror::Class* klass : classes) { 1151 if (!visitor(klass, arg)) { 1152 return; 1153 } 1154 } 1155 } 1156 1157 1158 ClassLinker::~ClassLinker() { 1159 mirror::Class::ResetClass(); 1160 mirror::String::ResetClass(); 1161 mirror::ArtField::ResetClass(); 1162 mirror::ArtMethod::ResetClass(); 1163 mirror::BooleanArray::ResetArrayClass(); 1164 mirror::ByteArray::ResetArrayClass(); 1165 mirror::CharArray::ResetArrayClass(); 1166 mirror::DoubleArray::ResetArrayClass(); 1167 mirror::FloatArray::ResetArrayClass(); 1168 mirror::IntArray::ResetArrayClass(); 1169 mirror::LongArray::ResetArrayClass(); 1170 mirror::ShortArray::ResetArrayClass(); 1171 mirror::Throwable::ResetClass(); 1172 mirror::StackTraceElement::ResetClass(); 1173 STLDeleteElements(&boot_class_path_); 1174 STLDeleteElements(&oat_files_); 1175 } 1176 1177 mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1178 gc::Heap* heap = Runtime::Current()->GetHeap(); 1179 mirror::Class* dex_cache_class = GetClassRoot(kJavaLangDexCache); 1180 SirtRef<mirror::DexCache> dex_cache(self, 1181 down_cast<mirror::DexCache*>(heap->AllocObject(self, dex_cache_class, 1182 dex_cache_class->GetObjectSize()))); 1183 if (dex_cache.get() == NULL) { 1184 return NULL; 1185 } 1186 SirtRef<mirror::String> 1187 location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str())); 1188 if (location.get() == NULL) { 1189 return NULL; 1190 } 1191 SirtRef<mirror::ObjectArray<mirror::String> > 1192 strings(self, AllocStringArray(self, dex_file.NumStringIds())); 1193 if (strings.get() == NULL) { 1194 return NULL; 1195 } 1196 SirtRef<mirror::ObjectArray<mirror::Class> > 1197 types(self, AllocClassArray(self, dex_file.NumTypeIds())); 1198 if (types.get() == NULL) { 1199 return NULL; 1200 } 1201 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 1202 methods(self, AllocArtMethodArray(self, dex_file.NumMethodIds())); 1203 if (methods.get() == NULL) { 1204 return NULL; 1205 } 1206 SirtRef<mirror::ObjectArray<mirror::ArtField> > 1207 fields(self, AllocArtFieldArray(self, dex_file.NumFieldIds())); 1208 if (fields.get() == NULL) { 1209 return NULL; 1210 } 1211 SirtRef<mirror::ObjectArray<mirror::StaticStorageBase> > 1212 initialized_static_storage(self, 1213 AllocObjectArray<mirror::StaticStorageBase>(self, dex_file.NumTypeIds())); 1214 if (initialized_static_storage.get() == NULL) { 1215 return NULL; 1216 } 1217 1218 dex_cache->Init(&dex_file, 1219 location.get(), 1220 strings.get(), 1221 types.get(), 1222 methods.get(), 1223 fields.get(), 1224 initialized_static_storage.get()); 1225 return dex_cache.get(); 1226 } 1227 1228 mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1229 size_t class_size) { 1230 DCHECK_GE(class_size, sizeof(mirror::Class)); 1231 gc::Heap* heap = Runtime::Current()->GetHeap(); 1232 mirror::Object* k = heap->AllocObject(self, java_lang_Class, class_size); 1233 if (UNLIKELY(k == NULL)) { 1234 CHECK(self->IsExceptionPending()); // OOME. 1235 return NULL; 1236 } 1237 mirror::Class* klass = k->AsClass(); 1238 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1239 klass->SetClassSize(class_size); 1240 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1241 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1242 return klass; 1243 } 1244 1245 mirror::Class* ClassLinker::AllocClass(Thread* self, size_t class_size) { 1246 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1247 } 1248 1249 mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1250 return down_cast<mirror::ArtField*>(GetClassRoot(kJavaLangReflectArtField)->AllocObject(self)); 1251 } 1252 1253 mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1254 return down_cast<mirror::ArtMethod*>(GetClassRoot(kJavaLangReflectArtMethod)->AllocObject(self)); 1255 } 1256 1257 mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray(Thread* self, 1258 size_t length) { 1259 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc(self, 1260 GetClassRoot(kJavaLangStackTraceElementArrayClass), 1261 length); 1262 } 1263 1264 static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1265 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1266 DCHECK(klass != NULL); 1267 // Wait for the class if it has not already been linked. 1268 if (!klass->IsResolved() && !klass->IsErroneous()) { 1269 ObjectLock lock(self, klass); 1270 // Check for circular dependencies between classes. 1271 if (!klass->IsResolved() && klass->GetClinitThreadId() == self->GetTid()) { 1272 ThrowClassCircularityError(klass); 1273 klass->SetStatus(mirror::Class::kStatusError, self); 1274 return NULL; 1275 } 1276 // Wait for the pending initialization to complete. 1277 while (!klass->IsResolved() && !klass->IsErroneous()) { 1278 lock.WaitIgnoringInterrupts(); 1279 } 1280 } 1281 if (klass->IsErroneous()) { 1282 ThrowEarlierClassFailure(klass); 1283 return NULL; 1284 } 1285 // Return the loaded class. No exceptions should be pending. 1286 CHECK(klass->IsResolved()) << PrettyClass(klass); 1287 self->AssertNoPendingException(); 1288 return klass; 1289 } 1290 1291 bool ClassLinker::IsInBootClassPath(const char* descriptor) { 1292 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1293 return pair.second != NULL; 1294 } 1295 1296 mirror::Class* ClassLinker::FindSystemClass(const char* descriptor) { 1297 return FindClass(descriptor, NULL); 1298 } 1299 1300 mirror::Class* ClassLinker::FindClass(const char* descriptor, mirror::ClassLoader* class_loader) { 1301 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1302 Thread* self = Thread::Current(); 1303 DCHECK(self != NULL); 1304 self->AssertNoPendingException(); 1305 if (descriptor[1] == '\0') { 1306 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1307 // for primitive classes that aren't backed by dex files. 1308 return FindPrimitiveClass(descriptor[0]); 1309 } 1310 // Find the class in the loaded classes table. 1311 mirror::Class* klass = LookupClass(descriptor, class_loader); 1312 if (klass != NULL) { 1313 return EnsureResolved(self, klass); 1314 } 1315 // Class is not yet loaded. 1316 if (descriptor[0] == '[') { 1317 return CreateArrayClass(descriptor, class_loader); 1318 1319 } else if (class_loader == NULL) { 1320 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1321 if (pair.second != NULL) { 1322 return DefineClass(descriptor, NULL, *pair.first, *pair.second); 1323 } 1324 1325 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1326 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1327 // throw of a NoClassDefFoundError. 1328 if (IsInBootClassPath(descriptor)) { 1329 mirror::Class* system_class = FindSystemClass(descriptor); 1330 CHECK(system_class != NULL); 1331 return system_class; 1332 } 1333 // Next try the compile time class path. 1334 const std::vector<const DexFile*>* class_path; 1335 { 1336 ScopedObjectAccessUnchecked soa(self); 1337 ScopedLocalRef<jobject> jclass_loader(soa.Env(), soa.AddLocalReference<jobject>(class_loader)); 1338 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1339 } 1340 1341 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1342 if (pair.second != NULL) { 1343 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1344 } 1345 1346 } else { 1347 ScopedObjectAccessUnchecked soa(self->GetJniEnv()); 1348 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1349 soa.AddLocalReference<jobject>(class_loader)); 1350 std::string class_name_string(DescriptorToDot(descriptor)); 1351 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1352 { 1353 ScopedThreadStateChange tsc(self, kNative); 1354 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1355 soa.Env()->NewStringUTF(class_name_string.c_str())); 1356 if (class_name_object.get() == NULL) { 1357 return NULL; 1358 } 1359 CHECK(class_loader_object.get() != NULL); 1360 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1361 WellKnownClasses::java_lang_ClassLoader_loadClass, 1362 class_name_object.get())); 1363 } 1364 if (soa.Self()->IsExceptionPending()) { 1365 // If the ClassLoader threw, pass that exception up. 1366 return NULL; 1367 } else if (result.get() == NULL) { 1368 // broken loader - throw NPE to be compatible with Dalvik 1369 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1370 class_name_string.c_str()).c_str()); 1371 return NULL; 1372 } else { 1373 // success, return mirror::Class* 1374 return soa.Decode<mirror::Class*>(result.get()); 1375 } 1376 } 1377 1378 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1379 return NULL; 1380 } 1381 1382 mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1383 mirror::ClassLoader* class_loader, 1384 const DexFile& dex_file, 1385 const DexFile::ClassDef& dex_class_def) { 1386 Thread* self = Thread::Current(); 1387 SirtRef<mirror::Class> klass(self, NULL); 1388 // Load the class from the dex file. 1389 if (UNLIKELY(!init_done_)) { 1390 // finish up init of hand crafted class_roots_ 1391 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1392 klass.reset(GetClassRoot(kJavaLangObject)); 1393 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1394 klass.reset(GetClassRoot(kJavaLangClass)); 1395 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1396 klass.reset(GetClassRoot(kJavaLangString)); 1397 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1398 klass.reset(GetClassRoot(kJavaLangDexCache)); 1399 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1400 klass.reset(GetClassRoot(kJavaLangReflectArtField)); 1401 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1402 klass.reset(GetClassRoot(kJavaLangReflectArtMethod)); 1403 } else { 1404 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1405 } 1406 } else { 1407 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1408 } 1409 if (UNLIKELY(klass.get() == NULL)) { 1410 CHECK(self->IsExceptionPending()); // Expect an OOME. 1411 return NULL; 1412 } 1413 klass->SetDexCache(FindDexCache(dex_file)); 1414 LoadClass(dex_file, dex_class_def, klass, class_loader); 1415 // Check for a pending exception during load 1416 if (self->IsExceptionPending()) { 1417 klass->SetStatus(mirror::Class::kStatusError, self); 1418 return NULL; 1419 } 1420 ObjectLock lock(self, klass.get()); 1421 klass->SetClinitThreadId(self->GetTid()); 1422 { 1423 // Add the newly loaded class to the loaded classes table. 1424 mirror::Class* existing = InsertClass(descriptor, klass.get(), Hash(descriptor)); 1425 if (existing != NULL) { 1426 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1427 // this thread to block. 1428 return EnsureResolved(self, existing); 1429 } 1430 } 1431 // Finish loading (if necessary) by finding parents 1432 CHECK(!klass->IsLoaded()); 1433 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1434 // Loading failed. 1435 klass->SetStatus(mirror::Class::kStatusError, self); 1436 return NULL; 1437 } 1438 CHECK(klass->IsLoaded()); 1439 // Link the class (if necessary) 1440 CHECK(!klass->IsResolved()); 1441 if (!LinkClass(klass, NULL, self)) { 1442 // Linking failed. 1443 klass->SetStatus(mirror::Class::kStatusError, self); 1444 return NULL; 1445 } 1446 CHECK(klass->IsResolved()); 1447 1448 /* 1449 * We send CLASS_PREPARE events to the debugger from here. The 1450 * definition of "preparation" is creating the static fields for a 1451 * class and initializing them to the standard default values, but not 1452 * executing any code (that comes later, during "initialization"). 1453 * 1454 * We did the static preparation in LinkClass. 1455 * 1456 * The class has been prepared and resolved but possibly not yet verified 1457 * at this point. 1458 */ 1459 Dbg::PostClassPrepare(klass.get()); 1460 1461 return klass.get(); 1462 } 1463 1464 // Precomputes size that will be needed for Class, matching LinkStaticFields 1465 size_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1466 const DexFile::ClassDef& dex_class_def) { 1467 const byte* class_data = dex_file.GetClassData(dex_class_def); 1468 size_t num_ref = 0; 1469 size_t num_32 = 0; 1470 size_t num_64 = 0; 1471 if (class_data != NULL) { 1472 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1473 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1474 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1475 char c = descriptor[0]; 1476 if (c == 'L' || c == '[') { 1477 num_ref++; 1478 } else if (c == 'J' || c == 'D') { 1479 num_64++; 1480 } else { 1481 num_32++; 1482 } 1483 } 1484 } 1485 // start with generic class data 1486 size_t size = sizeof(mirror::Class); 1487 // follow with reference fields which must be contiguous at start 1488 size += (num_ref * sizeof(uint32_t)); 1489 // if there are 64-bit fields to add, make sure they are aligned 1490 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1491 if (num_32 != 0) { 1492 // use an available 32-bit field for padding 1493 num_32--; 1494 } 1495 size += sizeof(uint32_t); // either way, we are adding a word 1496 DCHECK_EQ(size, RoundUp(size, 8)); 1497 } 1498 // tack on any 64-bit fields now that alignment is assured 1499 size += (num_64 * sizeof(uint64_t)); 1500 // tack on any remaining 32-bit fields 1501 size += (num_32 * sizeof(uint32_t)); 1502 return size; 1503 } 1504 1505 const OatFile::OatClass* ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1506 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1507 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1508 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1509 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1510 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation(), 1511 &dex_location_checksum); 1512 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1513 const OatFile::OatClass* oat_class = oat_dex_file->GetOatClass(class_def_idx); 1514 CHECK(oat_class != NULL) << dex_file.GetLocation() << " " << class_def_idx; 1515 return oat_class; 1516 } 1517 1518 static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1519 uint32_t method_idx) { 1520 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1521 const byte* class_data = dex_file.GetClassData(class_def); 1522 CHECK(class_data != NULL); 1523 ClassDataItemIterator it(dex_file, class_data); 1524 // Skip fields 1525 while (it.HasNextStaticField()) { 1526 it.Next(); 1527 } 1528 while (it.HasNextInstanceField()) { 1529 it.Next(); 1530 } 1531 // Process methods 1532 size_t class_def_method_index = 0; 1533 while (it.HasNextDirectMethod()) { 1534 if (it.GetMemberIndex() == method_idx) { 1535 return class_def_method_index; 1536 } 1537 class_def_method_index++; 1538 it.Next(); 1539 } 1540 while (it.HasNextVirtualMethod()) { 1541 if (it.GetMemberIndex() == method_idx) { 1542 return class_def_method_index; 1543 } 1544 class_def_method_index++; 1545 it.Next(); 1546 } 1547 DCHECK(!it.HasNext()); 1548 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1549 return 0; 1550 } 1551 1552 const OatFile::OatMethod ClassLinker::GetOatMethodFor(const mirror::ArtMethod* method) { 1553 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1554 // method for direct methods (or virtual methods made direct). 1555 mirror::Class* declaring_class = method->GetDeclaringClass(); 1556 size_t oat_method_index; 1557 if (method->IsStatic() || method->IsDirect()) { 1558 // Simple case where the oat method index was stashed at load time. 1559 oat_method_index = method->GetMethodIndex(); 1560 } else { 1561 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1562 // by search for its position in the declared virtual methods. 1563 oat_method_index = declaring_class->NumDirectMethods(); 1564 size_t end = declaring_class->NumVirtualMethods(); 1565 bool found = false; 1566 for (size_t i = 0; i < end; i++) { 1567 if (declaring_class->GetVirtualMethod(i) == method) { 1568 found = true; 1569 break; 1570 } 1571 oat_method_index++; 1572 } 1573 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1574 } 1575 UniquePtr<const OatFile::OatClass> 1576 oat_class(GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1577 declaring_class->GetDexClassDefIndex())); 1578 CHECK(oat_class.get() != NULL); 1579 DCHECK_EQ(oat_method_index, 1580 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1581 method->GetDeclaringClass()->GetDexClassDefIndex(), 1582 method->GetDexMethodIndex())); 1583 1584 return oat_class->GetOatMethod(oat_method_index); 1585 } 1586 1587 // Special case to get oat code without overwriting a trampoline. 1588 const void* ClassLinker::GetOatCodeFor(const mirror::ArtMethod* method) { 1589 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1590 if (method->IsProxyMethod()) { 1591 #if !defined(ART_USE_PORTABLE_COMPILER) 1592 return reinterpret_cast<void*>(art_quick_proxy_invoke_handler); 1593 #else 1594 return reinterpret_cast<void*>(art_portable_proxy_invoke_handler); 1595 #endif 1596 } 1597 const void* result = GetOatMethodFor(method).GetCode(); 1598 if (result == NULL) { 1599 // No code? You must mean to go into the interpreter. 1600 result = GetCompiledCodeToInterpreterBridge(); 1601 } 1602 return result; 1603 } 1604 1605 const void* ClassLinker::GetOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1606 uint32_t method_idx) { 1607 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1608 CHECK(oat_class.get() != nullptr); 1609 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1610 return oat_class->GetOatMethod(oat_method_idx).GetCode(); 1611 } 1612 1613 // Returns true if the method must run with interpreter, false otherwise. 1614 static bool NeedsInterpreter(const mirror::ArtMethod* method, const void* code) { 1615 if (code == NULL) { 1616 // No code: need interpreter. 1617 return true; 1618 } 1619 #ifdef ART_SEA_IR_MODE 1620 ScopedObjectAccess soa(Thread::Current()); 1621 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1622 LOG(INFO) << "Found " << PrettyMethod(method); 1623 return false; 1624 } 1625 #endif 1626 // If interpreter mode is enabled, every method (except native and proxy) must 1627 // be run with interpreter. 1628 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1629 !method->IsNative() && !method->IsProxyMethod(); 1630 } 1631 1632 void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1633 ClassHelper kh(klass); 1634 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 1635 CHECK(dex_class_def != NULL); 1636 const DexFile& dex_file = kh.GetDexFile(); 1637 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1638 if (class_data == NULL) { 1639 return; // no fields or methods - for example a marker interface 1640 } 1641 Runtime* runtime = Runtime::Current(); 1642 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1643 // OAT file unavailable 1644 return; 1645 } 1646 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1647 CHECK(oat_class.get() != NULL); 1648 ClassDataItemIterator it(dex_file, class_data); 1649 // Skip fields 1650 while (it.HasNextStaticField()) { 1651 it.Next(); 1652 } 1653 while (it.HasNextInstanceField()) { 1654 it.Next(); 1655 } 1656 // Link the code of methods skipped by LinkCode 1657 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1658 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1659 if (!method->IsStatic()) { 1660 // Only update static methods. 1661 continue; 1662 } 1663 const void* code = oat_class->GetOatMethod(method_index).GetCode(); 1664 const bool enter_interpreter = NeedsInterpreter(method, code); 1665 if (enter_interpreter) { 1666 // Use interpreter entry point. 1667 code = GetCompiledCodeToInterpreterBridge(); 1668 } 1669 runtime->GetInstrumentation()->UpdateMethodsCode(method, code); 1670 } 1671 // Ignore virtual methods on the iterator. 1672 } 1673 1674 static void LinkCode(SirtRef<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class, 1675 uint32_t method_index) 1676 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1677 // Method shouldn't have already been linked. 1678 DCHECK(method->GetEntryPointFromCompiledCode() == NULL); 1679 // Every kind of method should at least get an invoke stub from the oat_method. 1680 // non-abstract methods also get their code pointers. 1681 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1682 oat_method.LinkMethod(method.get()); 1683 1684 // Install entry point from interpreter. 1685 Runtime* runtime = Runtime::Current(); 1686 bool enter_interpreter = NeedsInterpreter(method.get(), method->GetEntryPointFromCompiledCode()); 1687 if (enter_interpreter) { 1688 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1689 } else { 1690 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1691 } 1692 1693 if (method->IsAbstract()) { 1694 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1695 return; 1696 } 1697 1698 if (method->IsStatic() && !method->IsConstructor()) { 1699 // For static methods excluding the class initializer, install the trampoline. 1700 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1701 // after initializing class (see ClassLinker::InitializeClass method). 1702 method->SetEntryPointFromCompiledCode(GetResolutionTrampoline(runtime->GetClassLinker())); 1703 } else if (enter_interpreter) { 1704 // Set entry point from compiled code if there's no code or in interpreter only mode. 1705 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1706 } 1707 1708 if (method->IsNative()) { 1709 // Unregistering restores the dlsym lookup stub. 1710 method->UnregisterNative(Thread::Current()); 1711 } 1712 1713 // Allow instrumentation its chance to hijack code. 1714 runtime->GetInstrumentation()->UpdateMethodsCode(method.get(), 1715 method->GetEntryPointFromCompiledCode()); 1716 } 1717 1718 void ClassLinker::LoadClass(const DexFile& dex_file, 1719 const DexFile::ClassDef& dex_class_def, 1720 SirtRef<mirror::Class>& klass, 1721 mirror::ClassLoader* class_loader) { 1722 CHECK(klass.get() != NULL); 1723 CHECK(klass->GetDexCache() != NULL); 1724 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1725 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1726 CHECK(descriptor != NULL); 1727 1728 klass->SetClass(GetClassRoot(kJavaLangClass)); 1729 uint32_t access_flags = dex_class_def.access_flags_; 1730 // Make sure that none of our runtime-only flags are set. 1731 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1732 klass->SetAccessFlags(access_flags); 1733 klass->SetClassLoader(class_loader); 1734 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1735 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1736 1737 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1738 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1739 1740 // Load fields fields. 1741 const byte* class_data = dex_file.GetClassData(dex_class_def); 1742 if (class_data == NULL) { 1743 return; // no fields or methods - for example a marker interface 1744 } 1745 ClassDataItemIterator it(dex_file, class_data); 1746 Thread* self = Thread::Current(); 1747 if (it.NumStaticFields() != 0) { 1748 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1749 if (UNLIKELY(statics == NULL)) { 1750 CHECK(self->IsExceptionPending()); // OOME. 1751 return; 1752 } 1753 klass->SetSFields(statics); 1754 } 1755 if (it.NumInstanceFields() != 0) { 1756 mirror::ObjectArray<mirror::ArtField>* fields = 1757 AllocArtFieldArray(self, it.NumInstanceFields()); 1758 if (UNLIKELY(fields == NULL)) { 1759 CHECK(self->IsExceptionPending()); // OOME. 1760 return; 1761 } 1762 klass->SetIFields(fields); 1763 } 1764 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1765 SirtRef<mirror::ArtField> sfield(self, AllocArtField(self)); 1766 if (UNLIKELY(sfield.get() == NULL)) { 1767 CHECK(self->IsExceptionPending()); // OOME. 1768 return; 1769 } 1770 klass->SetStaticField(i, sfield.get()); 1771 LoadField(dex_file, it, klass, sfield); 1772 } 1773 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1774 SirtRef<mirror::ArtField> ifield(self, AllocArtField(self)); 1775 if (UNLIKELY(ifield.get() == NULL)) { 1776 CHECK(self->IsExceptionPending()); // OOME. 1777 return; 1778 } 1779 klass->SetInstanceField(i, ifield.get()); 1780 LoadField(dex_file, it, klass, ifield); 1781 } 1782 1783 UniquePtr<const OatFile::OatClass> oat_class; 1784 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1785 oat_class.reset(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1786 } 1787 1788 // Load methods. 1789 if (it.NumDirectMethods() != 0) { 1790 // TODO: append direct methods to class object 1791 mirror::ObjectArray<mirror::ArtMethod>* directs = 1792 AllocArtMethodArray(self, it.NumDirectMethods()); 1793 if (UNLIKELY(directs == NULL)) { 1794 CHECK(self->IsExceptionPending()); // OOME. 1795 return; 1796 } 1797 klass->SetDirectMethods(directs); 1798 } 1799 if (it.NumVirtualMethods() != 0) { 1800 // TODO: append direct methods to class object 1801 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1802 AllocArtMethodArray(self, it.NumVirtualMethods()); 1803 if (UNLIKELY(virtuals == NULL)) { 1804 CHECK(self->IsExceptionPending()); // OOME. 1805 return; 1806 } 1807 klass->SetVirtualMethods(virtuals); 1808 } 1809 size_t class_def_method_index = 0; 1810 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1811 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1812 if (UNLIKELY(method.get() == NULL)) { 1813 CHECK(self->IsExceptionPending()); // OOME. 1814 return; 1815 } 1816 klass->SetDirectMethod(i, method.get()); 1817 if (oat_class.get() != NULL) { 1818 LinkCode(method, oat_class.get(), class_def_method_index); 1819 } 1820 method->SetMethodIndex(class_def_method_index); 1821 class_def_method_index++; 1822 } 1823 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1824 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1825 if (UNLIKELY(method.get() == NULL)) { 1826 CHECK(self->IsExceptionPending()); // OOME. 1827 return; 1828 } 1829 klass->SetVirtualMethod(i, method.get()); 1830 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1831 if (oat_class.get() != NULL) { 1832 LinkCode(method, oat_class.get(), class_def_method_index); 1833 } 1834 class_def_method_index++; 1835 } 1836 DCHECK(!it.HasNext()); 1837 } 1838 1839 void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1840 SirtRef<mirror::Class>& klass, SirtRef<mirror::ArtField>& dst) { 1841 uint32_t field_idx = it.GetMemberIndex(); 1842 dst->SetDexFieldIndex(field_idx); 1843 dst->SetDeclaringClass(klass.get()); 1844 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1845 } 1846 1847 mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1848 const ClassDataItemIterator& it, 1849 SirtRef<mirror::Class>& klass) { 1850 uint32_t dex_method_idx = it.GetMemberIndex(); 1851 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1852 StringPiece method_name(dex_file.GetMethodName(method_id)); 1853 1854 mirror::ArtMethod* dst = AllocArtMethod(self); 1855 if (UNLIKELY(dst == NULL)) { 1856 CHECK(self->IsExceptionPending()); // OOME. 1857 return NULL; 1858 } 1859 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 1860 1861 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 1862 dst->SetDexMethodIndex(dex_method_idx); 1863 dst->SetDeclaringClass(klass.get()); 1864 1865 if (method_name == "finalize") { 1866 // Create the prototype for a signature of "()V" 1867 const DexFile::StringId* void_string_id = dex_file.FindStringId("V"); 1868 if (void_string_id != NULL) { 1869 const DexFile::TypeId* void_type_id = 1870 dex_file.FindTypeId(dex_file.GetIndexForStringId(*void_string_id)); 1871 if (void_type_id != NULL) { 1872 std::vector<uint16_t> no_args; 1873 const DexFile::ProtoId* finalizer_proto = 1874 dex_file.FindProtoId(dex_file.GetIndexForTypeId(*void_type_id), no_args); 1875 if (finalizer_proto != NULL) { 1876 // We have the prototype in the dex file 1877 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 1878 klass->SetFinalizable(); 1879 } else { 1880 ClassHelper kh(klass.get()); 1881 StringPiece klass_descriptor(kh.GetDescriptor()); 1882 // The Enum class declares a "final" finalize() method to prevent subclasses from 1883 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 1884 // subclasses, so we exclude it here. 1885 // We also want to avoid setting the flag on Object, where we know that finalize() is 1886 // empty. 1887 if (klass_descriptor != "Ljava/lang/Object;" && 1888 klass_descriptor != "Ljava/lang/Enum;") { 1889 klass->SetFinalizable(); 1890 } 1891 } 1892 } 1893 } 1894 } 1895 } 1896 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 1897 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1898 1899 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 1900 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 1901 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 1902 dst->SetDexCacheInitializedStaticStorage(klass->GetDexCache()->GetInitializedStaticStorage()); 1903 1904 CHECK(dst->IsArtMethod()); 1905 1906 self->EndAssertNoThreadSuspension(old_cause); 1907 return dst; 1908 } 1909 1910 void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 1911 Thread* self = Thread::Current(); 1912 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1913 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 1914 AppendToBootClassPath(dex_file, dex_cache); 1915 } 1916 1917 void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1918 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1919 boot_class_path_.push_back(&dex_file); 1920 RegisterDexFile(dex_file, dex_cache); 1921 } 1922 1923 bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 1924 dex_lock_.AssertSharedHeld(Thread::Current()); 1925 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1926 if (dex_caches_[i]->GetDexFile() == &dex_file) { 1927 return true; 1928 } 1929 } 1930 return false; 1931 } 1932 1933 bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 1934 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1935 return IsDexFileRegisteredLocked(dex_file); 1936 } 1937 1938 void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1939 dex_lock_.AssertExclusiveHeld(Thread::Current()); 1940 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1941 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 1942 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 1943 dex_caches_.push_back(dex_cache.get()); 1944 dex_cache->SetDexFile(&dex_file); 1945 dex_caches_dirty_ = true; 1946 } 1947 1948 void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 1949 Thread* self = Thread::Current(); 1950 { 1951 ReaderMutexLock mu(self, dex_lock_); 1952 if (IsDexFileRegisteredLocked(dex_file)) { 1953 return; 1954 } 1955 } 1956 // Don't alloc while holding the lock, since allocation may need to 1957 // suspend all threads and another thread may need the dex_lock_ to 1958 // get to a suspend point. 1959 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1960 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 1961 { 1962 WriterMutexLock mu(self, dex_lock_); 1963 if (IsDexFileRegisteredLocked(dex_file)) { 1964 return; 1965 } 1966 RegisterDexFileLocked(dex_file, dex_cache); 1967 } 1968 } 1969 1970 void ClassLinker::RegisterDexFile(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1971 WriterMutexLock mu(Thread::Current(), dex_lock_); 1972 RegisterDexFileLocked(dex_file, dex_cache); 1973 } 1974 1975 mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 1976 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1977 // Search assuming unique-ness of dex file. 1978 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1979 mirror::DexCache* dex_cache = dex_caches_[i]; 1980 if (dex_cache->GetDexFile() == &dex_file) { 1981 return dex_cache; 1982 } 1983 } 1984 // Search matching by location name. 1985 std::string location(dex_file.GetLocation()); 1986 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1987 mirror::DexCache* dex_cache = dex_caches_[i]; 1988 if (dex_cache->GetDexFile()->GetLocation() == location) { 1989 return dex_cache; 1990 } 1991 } 1992 // Failure, dump diagnostic and abort. 1993 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1994 mirror::DexCache* dex_cache = dex_caches_[i]; 1995 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 1996 } 1997 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 1998 return NULL; 1999 } 2000 2001 void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 2002 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2003 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2004 dex_caches_[i]->Fixup(resolution_method); 2005 } 2006 } 2007 2008 mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2009 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2010 if (UNLIKELY(klass == NULL)) { 2011 return NULL; 2012 } 2013 return InitializePrimitiveClass(klass, type); 2014 } 2015 2016 mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, Primitive::Type type) { 2017 CHECK(primitive_class != NULL); 2018 // Must hold lock on object when initializing. 2019 Thread* self = Thread::Current(); 2020 ObjectLock lock(self, primitive_class); 2021 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2022 primitive_class->SetPrimitiveType(type); 2023 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2024 const char* descriptor = Primitive::Descriptor(type); 2025 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2026 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2027 return primitive_class; 2028 } 2029 2030 // Create an array class (i.e. the class object for the array, not the 2031 // array itself). "descriptor" looks like "[C" or "[[[[B" or 2032 // "[Ljava/lang/String;". 2033 // 2034 // If "descriptor" refers to an array of primitives, look up the 2035 // primitive type's internally-generated class object. 2036 // 2037 // "class_loader" is the class loader of the class that's referring to 2038 // us. It's used to ensure that we're looking for the element type in 2039 // the right context. It does NOT become the class loader for the 2040 // array class; that always comes from the base element class. 2041 // 2042 // Returns NULL with an exception raised on failure. 2043 mirror::Class* ClassLinker::CreateArrayClass(const char* descriptor, 2044 mirror::ClassLoader* class_loader) { 2045 // Identify the underlying component type 2046 CHECK_EQ('[', descriptor[0]); 2047 mirror::Class* component_type = FindClass(descriptor + 1, class_loader); 2048 if (component_type == NULL) { 2049 DCHECK(Thread::Current()->IsExceptionPending()); 2050 return NULL; 2051 } 2052 2053 // See if the component type is already loaded. Array classes are 2054 // always associated with the class loader of their underlying 2055 // element type -- an array of Strings goes with the loader for 2056 // java/lang/String -- so we need to look for it there. (The 2057 // caller should have checked for the existence of the class 2058 // before calling here, but they did so with *their* class loader, 2059 // not the component type's loader.) 2060 // 2061 // If we find it, the caller adds "loader" to the class' initiating 2062 // loader list, which should prevent us from going through this again. 2063 // 2064 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2065 // are the same, because our caller (FindClass) just did the 2066 // lookup. (Even if we get this wrong we still have correct behavior, 2067 // because we effectively do this lookup again when we add the new 2068 // class to the hash table --- necessary because of possible races with 2069 // other threads.) 2070 if (class_loader != component_type->GetClassLoader()) { 2071 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2072 if (new_class != NULL) { 2073 return new_class; 2074 } 2075 } 2076 2077 // Fill out the fields in the Class. 2078 // 2079 // It is possible to execute some methods against arrays, because 2080 // all arrays are subclasses of java_lang_Object_, so we need to set 2081 // up a vtable. We can just point at the one in java_lang_Object_. 2082 // 2083 // Array classes are simple enough that we don't need to do a full 2084 // link step. 2085 Thread* self = Thread::Current(); 2086 SirtRef<mirror::Class> new_class(self, NULL); 2087 if (UNLIKELY(!init_done_)) { 2088 // Classes that were hand created, ie not by FindSystemClass 2089 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2090 new_class.reset(GetClassRoot(kClassArrayClass)); 2091 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2092 new_class.reset(GetClassRoot(kObjectArrayClass)); 2093 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2094 new_class.reset(GetClassRoot(kJavaLangStringArrayClass)); 2095 } else if (strcmp(descriptor, 2096 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2097 new_class.reset(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2098 } else if (strcmp(descriptor, 2099 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2100 new_class.reset(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2101 } else if (strcmp(descriptor, "[C") == 0) { 2102 new_class.reset(GetClassRoot(kCharArrayClass)); 2103 } else if (strcmp(descriptor, "[I") == 0) { 2104 new_class.reset(GetClassRoot(kIntArrayClass)); 2105 } 2106 } 2107 if (new_class.get() == NULL) { 2108 new_class.reset(AllocClass(self, sizeof(mirror::Class))); 2109 if (new_class.get() == NULL) { 2110 return NULL; 2111 } 2112 new_class->SetComponentType(component_type); 2113 } 2114 ObjectLock lock(self, new_class.get()); // Must hold lock on object when initializing. 2115 DCHECK(new_class->GetComponentType() != NULL); 2116 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2117 new_class->SetSuperClass(java_lang_Object); 2118 new_class->SetVTable(java_lang_Object->GetVTable()); 2119 new_class->SetPrimitiveType(Primitive::kPrimNot); 2120 new_class->SetClassLoader(component_type->GetClassLoader()); 2121 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2122 // don't need to set new_class->SetObjectSize(..) 2123 // because Object::SizeOf delegates to Array::SizeOf 2124 2125 2126 // All arrays have java/lang/Cloneable and java/io/Serializable as 2127 // interfaces. We need to set that up here, so that stuff like 2128 // "instanceof" works right. 2129 // 2130 // Note: The GC could run during the call to FindSystemClass, 2131 // so we need to make sure the class object is GC-valid while we're in 2132 // there. Do this by clearing the interface list so the GC will just 2133 // think that the entries are null. 2134 2135 2136 // Use the single, global copies of "interfaces" and "iftable" 2137 // (remember not to free them for arrays). 2138 CHECK(array_iftable_ != NULL); 2139 new_class->SetIfTable(array_iftable_); 2140 2141 // Inherit access flags from the component type. 2142 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2143 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2144 access_flags &= kAccJavaFlagsMask; 2145 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2146 // and remove "interface". 2147 access_flags |= kAccAbstract | kAccFinal; 2148 access_flags &= ~kAccInterface; 2149 2150 new_class->SetAccessFlags(access_flags); 2151 2152 mirror::Class* existing = InsertClass(descriptor, new_class.get(), Hash(descriptor)); 2153 if (existing == NULL) { 2154 return new_class.get(); 2155 } 2156 // Another thread must have loaded the class after we 2157 // started but before we finished. Abandon what we've 2158 // done. 2159 // 2160 // (Yes, this happens.) 2161 2162 return existing; 2163 } 2164 2165 mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2166 switch (Primitive::GetType(type)) { 2167 case Primitive::kPrimByte: 2168 return GetClassRoot(kPrimitiveByte); 2169 case Primitive::kPrimChar: 2170 return GetClassRoot(kPrimitiveChar); 2171 case Primitive::kPrimDouble: 2172 return GetClassRoot(kPrimitiveDouble); 2173 case Primitive::kPrimFloat: 2174 return GetClassRoot(kPrimitiveFloat); 2175 case Primitive::kPrimInt: 2176 return GetClassRoot(kPrimitiveInt); 2177 case Primitive::kPrimLong: 2178 return GetClassRoot(kPrimitiveLong); 2179 case Primitive::kPrimShort: 2180 return GetClassRoot(kPrimitiveShort); 2181 case Primitive::kPrimBoolean: 2182 return GetClassRoot(kPrimitiveBoolean); 2183 case Primitive::kPrimVoid: 2184 return GetClassRoot(kPrimitiveVoid); 2185 case Primitive::kPrimNot: 2186 break; 2187 } 2188 std::string printable_type(PrintableChar(type)); 2189 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2190 return NULL; 2191 } 2192 2193 mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2194 size_t hash) { 2195 if (VLOG_IS_ON(class_linker)) { 2196 mirror::DexCache* dex_cache = klass->GetDexCache(); 2197 std::string source; 2198 if (dex_cache != NULL) { 2199 source += " from "; 2200 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2201 } 2202 LOG(INFO) << "Loaded class " << descriptor << source; 2203 } 2204 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2205 mirror::Class* existing = 2206 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2207 if (existing != NULL) { 2208 return existing; 2209 } 2210 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2211 // Check a class loaded with the system class loader matches one in the image if the class 2212 // is in the image. 2213 existing = LookupClassFromImage(descriptor); 2214 if (existing != NULL) { 2215 CHECK(klass == existing); 2216 } 2217 } 2218 Runtime::Current()->GetHeap()->VerifyObject(klass); 2219 class_table_.insert(std::make_pair(hash, klass)); 2220 class_table_dirty_ = true; 2221 return NULL; 2222 } 2223 2224 bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2225 size_t hash = Hash(descriptor); 2226 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2227 ClassHelper kh; 2228 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2229 ++it) { 2230 mirror::Class* klass = it->second; 2231 kh.ChangeClass(klass); 2232 if (strcmp(kh.GetDescriptor(), descriptor) == 0 && klass->GetClassLoader() == class_loader) { 2233 class_table_.erase(it); 2234 return true; 2235 } 2236 } 2237 return false; 2238 } 2239 2240 mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2241 const mirror::ClassLoader* class_loader) { 2242 size_t hash = Hash(descriptor); 2243 { 2244 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2245 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2246 if (result != NULL) { 2247 return result; 2248 } 2249 } 2250 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2251 return NULL; 2252 } else { 2253 // Lookup failed but need to search dex_caches_. 2254 mirror::Class* result = LookupClassFromImage(descriptor); 2255 if (result != NULL) { 2256 InsertClass(descriptor, result, hash); 2257 } else { 2258 // Searching the image dex files/caches failed, we don't want to get into this situation 2259 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2260 // classes into the class table. 2261 const int32_t kMaxFailedDexCacheLookups = 1000; 2262 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2263 MoveImageClassesToClassTable(); 2264 } 2265 } 2266 return result; 2267 } 2268 } 2269 2270 mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2271 const mirror::ClassLoader* class_loader, 2272 size_t hash) { 2273 ClassHelper kh(NULL, this); 2274 auto end = class_table_.end(); 2275 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2276 mirror::Class* klass = it->second; 2277 kh.ChangeClass(klass); 2278 if (klass->GetClassLoader() == class_loader && strcmp(descriptor, kh.GetDescriptor()) == 0) { 2279 if (kIsDebugBuild) { 2280 // Check for duplicates in the table. 2281 for (++it; it != end && it->first == hash; ++it) { 2282 mirror::Class* klass2 = it->second; 2283 kh.ChangeClass(klass2); 2284 CHECK(!(strcmp(descriptor, kh.GetDescriptor()) == 0 && klass2->GetClassLoader() == class_loader)) 2285 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2286 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2287 } 2288 } 2289 return klass; 2290 } 2291 } 2292 return NULL; 2293 } 2294 2295 static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2296 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2297 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2298 CHECK(image != NULL); 2299 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2300 return root->AsObjectArray<mirror::DexCache>(); 2301 } 2302 2303 void ClassLinker::MoveImageClassesToClassTable() { 2304 Thread* self = Thread::Current(); 2305 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2306 if (!dex_cache_image_class_lookup_required_) { 2307 return; // All dex cache classes are already in the class table. 2308 } 2309 const char* old_no_suspend_cause = 2310 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2311 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2312 ClassHelper kh(NULL, this); 2313 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2314 mirror::DexCache* dex_cache = dex_caches->Get(i); 2315 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2316 for (int32_t j = 0; j < types->GetLength(); j++) { 2317 mirror::Class* klass = types->Get(j); 2318 if (klass != NULL) { 2319 kh.ChangeClass(klass); 2320 DCHECK(klass->GetClassLoader() == NULL); 2321 const char* descriptor = kh.GetDescriptor(); 2322 size_t hash = Hash(descriptor); 2323 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 2324 if (existing != NULL) { 2325 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2326 << PrettyClassAndClassLoader(klass); 2327 } else { 2328 class_table_.insert(std::make_pair(hash, klass)); 2329 } 2330 } 2331 } 2332 } 2333 class_table_dirty_ = true; 2334 dex_cache_image_class_lookup_required_ = false; 2335 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2336 } 2337 2338 mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2339 Thread* self = Thread::Current(); 2340 const char* old_no_suspend_cause = 2341 self->StartAssertNoThreadSuspension("Image class lookup"); 2342 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2343 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2344 mirror::DexCache* dex_cache = dex_caches->Get(i); 2345 const DexFile* dex_file = dex_cache->GetDexFile(); 2346 // First search using the class def map, but don't bother for non-class types. 2347 if (descriptor[0] == 'L') { 2348 const DexFile::StringId* descriptor_string_id = dex_file->FindStringId(descriptor); 2349 if (descriptor_string_id != NULL) { 2350 const DexFile::TypeId* type_id = 2351 dex_file->FindTypeId(dex_file->GetIndexForStringId(*descriptor_string_id)); 2352 if (type_id != NULL) { 2353 mirror::Class* klass = dex_cache->GetResolvedType(dex_file->GetIndexForTypeId(*type_id)); 2354 if (klass != NULL) { 2355 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2356 return klass; 2357 } 2358 } 2359 } 2360 } 2361 // Now try binary searching the string/type index. 2362 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2363 if (string_id != NULL) { 2364 const DexFile::TypeId* type_id = 2365 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2366 if (type_id != NULL) { 2367 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2368 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2369 if (klass != NULL) { 2370 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2371 return klass; 2372 } 2373 } 2374 } 2375 } 2376 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2377 return NULL; 2378 } 2379 2380 void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2381 result.clear(); 2382 if (dex_cache_image_class_lookup_required_) { 2383 MoveImageClassesToClassTable(); 2384 } 2385 size_t hash = Hash(descriptor); 2386 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2387 ClassHelper kh(NULL, this); 2388 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2389 it != end && it->first == hash; ++it) { 2390 mirror::Class* klass = it->second; 2391 kh.ChangeClass(klass); 2392 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2393 result.push_back(klass); 2394 } 2395 } 2396 } 2397 2398 void ClassLinker::VerifyClass(mirror::Class* klass) { 2399 // TODO: assert that the monitor on the Class is held 2400 Thread* self = Thread::Current(); 2401 ObjectLock lock(self, klass); 2402 2403 // Don't attempt to re-verify if already sufficiently verified. 2404 if (klass->IsVerified() || 2405 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2406 return; 2407 } 2408 2409 // The class might already be erroneous, for example at compile time if we attempted to verify 2410 // this class as a parent to another. 2411 if (klass->IsErroneous()) { 2412 ThrowEarlierClassFailure(klass); 2413 return; 2414 } 2415 2416 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2417 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2418 } else { 2419 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2420 << PrettyClass(klass); 2421 CHECK(!Runtime::Current()->IsCompiler()); 2422 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2423 } 2424 2425 // Verify super class. 2426 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 2427 if (super.get() != NULL) { 2428 // Acquire lock to prevent races on verifying the super class. 2429 ObjectLock lock(self, super.get()); 2430 2431 if (!super->IsVerified() && !super->IsErroneous()) { 2432 VerifyClass(super.get()); 2433 } 2434 if (!super->IsCompileTimeVerified()) { 2435 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2436 PrettyDescriptor(klass).c_str(), 2437 PrettyDescriptor(super.get()).c_str())); 2438 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2439 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 2440 if (cause.get() != NULL) { 2441 self->ClearException(); 2442 } 2443 ThrowVerifyError(klass, "%s", error_msg.c_str()); 2444 if (cause.get() != NULL) { 2445 self->GetException(NULL)->SetCause(cause.get()); 2446 } 2447 klass->SetStatus(mirror::Class::kStatusError, self); 2448 return; 2449 } 2450 } 2451 2452 // Try to use verification information from the oat file, otherwise do runtime verification. 2453 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2454 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2455 bool preverified = VerifyClassUsingOatFile(dex_file, klass, oat_file_class_status); 2456 if (oat_file_class_status == mirror::Class::kStatusError) { 2457 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2458 << PrettyDescriptor(klass) << " in " 2459 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2460 ThrowVerifyError(klass, "Rejecting class %s because it failed compile-time verification", 2461 PrettyDescriptor(klass).c_str()); 2462 klass->SetStatus(mirror::Class::kStatusError, self); 2463 return; 2464 } 2465 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2466 std::string error_msg; 2467 if (!preverified) { 2468 verifier_failure = verifier::MethodVerifier::VerifyClass(klass, 2469 Runtime::Current()->IsCompiler(), 2470 &error_msg); 2471 } 2472 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2473 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2474 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass) 2475 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2476 << " because: " << error_msg; 2477 } 2478 self->AssertNoPendingException(); 2479 // Make sure all classes referenced by catch blocks are resolved. 2480 ResolveClassExceptionHandlerTypes(dex_file, klass); 2481 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2482 // Even though there were no verifier failures we need to respect whether the super-class 2483 // was verified or requiring runtime reverification. 2484 if (super.get() == NULL || super->IsVerified()) { 2485 klass->SetStatus(mirror::Class::kStatusVerified, self); 2486 } else { 2487 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2488 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2489 // Pretend a soft failure occured so that we don't consider the class verified below. 2490 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2491 } 2492 } else { 2493 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2494 // Soft failures at compile time should be retried at runtime. Soft 2495 // failures at runtime will be handled by slow paths in the generated 2496 // code. Set status accordingly. 2497 if (Runtime::Current()->IsCompiler()) { 2498 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2499 } else { 2500 klass->SetStatus(mirror::Class::kStatusVerified, self); 2501 } 2502 } 2503 } else { 2504 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass) 2505 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2506 << " because: " << error_msg; 2507 self->AssertNoPendingException(); 2508 ThrowVerifyError(klass, "%s", error_msg.c_str()); 2509 klass->SetStatus(mirror::Class::kStatusError, self); 2510 } 2511 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2512 // Class is verified so we don't need to do any access check on its methods. 2513 // Let the interpreter know it by setting the kAccPreverified flag onto each 2514 // method. 2515 // Note: we're going here during compilation and at runtime. When we set the 2516 // kAccPreverified flag when compiling image classes, the flag is recorded 2517 // in the image and is set when loading the image. 2518 klass->SetPreverifiedFlagOnAllMethods(); 2519 } 2520 } 2521 2522 bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2523 mirror::Class::Status& oat_file_class_status) { 2524 // If we're compiling, we can only verify the class using the oat file if 2525 // we are not compiling the image or if the class we're verifying is not part of 2526 // the app. In other words, we will only check for preverification of bootclasspath 2527 // classes. 2528 if (Runtime::Current()->IsCompiler()) { 2529 // Are we compiling the bootclasspath? 2530 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2531 return false; 2532 } 2533 // We are compiling an app (not the image). 2534 2535 // Is this an app class? (I.e. not a bootclasspath class) 2536 if (klass->GetClassLoader() != NULL) { 2537 return false; 2538 } 2539 } 2540 2541 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2542 // Make this work with gtests, which do not set up the image properly. 2543 // TODO: we should clean up gtests to set up the image path properly. 2544 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2545 return false; 2546 } 2547 2548 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2549 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2550 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation(), 2551 &dex_location_checksum); 2552 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2553 const char* descriptor = ClassHelper(klass).GetDescriptor(); 2554 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2555 UniquePtr<const OatFile::OatClass> oat_class(oat_dex_file->GetOatClass(class_def_index)); 2556 CHECK(oat_class.get() != NULL) 2557 << dex_file.GetLocation() << " " << PrettyClass(klass) << " " << descriptor; 2558 oat_file_class_status = oat_class->GetStatus(); 2559 if (oat_file_class_status == mirror::Class::kStatusVerified || 2560 oat_file_class_status == mirror::Class::kStatusInitialized) { 2561 return true; 2562 } 2563 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2564 // Compile time verification failed with a soft error. Compile time verification can fail 2565 // because we have incomplete type information. Consider the following: 2566 // class ... { 2567 // Foo x; 2568 // .... () { 2569 // if (...) { 2570 // v1 gets assigned a type of resolved class Foo 2571 // } else { 2572 // v1 gets assigned a type of unresolved class Bar 2573 // } 2574 // iput x = v1 2575 // } } 2576 // when we merge v1 following the if-the-else it results in Conflict 2577 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2578 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2579 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2580 // at compile time). 2581 return false; 2582 } 2583 if (oat_file_class_status == mirror::Class::kStatusError) { 2584 // Compile time verification failed with a hard error. This is caused by invalid instructions 2585 // in the class. These errors are unrecoverable. 2586 return false; 2587 } 2588 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2589 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2590 // not loading the class. 2591 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2592 // isn't a problem and this case shouldn't occur 2593 return false; 2594 } 2595 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2596 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " << descriptor; 2597 2598 return false; 2599 } 2600 2601 void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, mirror::Class* klass) { 2602 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2603 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2604 } 2605 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2606 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2607 } 2608 } 2609 2610 void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2611 mirror::ArtMethod* method) { 2612 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2613 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2614 if (code_item == NULL) { 2615 return; // native or abstract method 2616 } 2617 if (code_item->tries_size_ == 0) { 2618 return; // nothing to process 2619 } 2620 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2621 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2622 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2623 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2624 CatchHandlerIterator iterator(handlers_ptr); 2625 for (; iterator.HasNext(); iterator.Next()) { 2626 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2627 // unresolved exception types will be ignored by exception delivery 2628 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2629 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2630 if (exception_type == NULL) { 2631 DCHECK(Thread::Current()->IsExceptionPending()); 2632 Thread::Current()->ClearException(); 2633 } 2634 } 2635 } 2636 handlers_ptr = iterator.EndDataPointer(); 2637 } 2638 } 2639 2640 static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2641 static void CheckProxyMethod(mirror::ArtMethod* method, 2642 SirtRef<mirror::ArtMethod>& prototype); 2643 2644 mirror::Class* ClassLinker::CreateProxyClass(mirror::String* name, 2645 mirror::ObjectArray<mirror::Class>* interfaces, 2646 mirror::ClassLoader* loader, 2647 mirror::ObjectArray<mirror::ArtMethod>* methods, 2648 mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >* throws) { 2649 Thread* self = Thread::Current(); 2650 SirtRef<mirror::Class> klass(self, AllocClass(self, GetClassRoot(kJavaLangClass), 2651 sizeof(mirror::SynthesizedProxyClass))); 2652 if (klass.get() == NULL) { 2653 CHECK(self->IsExceptionPending()); // OOME. 2654 return NULL; 2655 } 2656 DCHECK(klass->GetClass() != NULL); 2657 klass->SetObjectSize(sizeof(mirror::Proxy)); 2658 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2659 klass->SetClassLoader(loader); 2660 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2661 klass->SetName(name); 2662 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2663 klass->SetDexCache(proxy_class->GetDexCache()); 2664 klass->SetStatus(mirror::Class::kStatusIdx, self); 2665 2666 // Instance fields are inherited, but we add a couple of static fields... 2667 { 2668 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2669 if (UNLIKELY(sfields == NULL)) { 2670 CHECK(self->IsExceptionPending()); // OOME. 2671 return NULL; 2672 } 2673 klass->SetSFields(sfields); 2674 } 2675 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2676 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2677 SirtRef<mirror::ArtField> interfaces_sfield(self, AllocArtField(self)); 2678 if (UNLIKELY(interfaces_sfield.get() == NULL)) { 2679 CHECK(self->IsExceptionPending()); // OOME. 2680 return NULL; 2681 } 2682 klass->SetStaticField(0, interfaces_sfield.get()); 2683 interfaces_sfield->SetDexFieldIndex(0); 2684 interfaces_sfield->SetDeclaringClass(klass.get()); 2685 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2686 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2687 SirtRef<mirror::ArtField> throws_sfield(self, AllocArtField(self)); 2688 if (UNLIKELY(throws_sfield.get() == NULL)) { 2689 CHECK(self->IsExceptionPending()); // OOME. 2690 return NULL; 2691 } 2692 klass->SetStaticField(1, throws_sfield.get()); 2693 throws_sfield->SetDexFieldIndex(1); 2694 throws_sfield->SetDeclaringClass(klass.get()); 2695 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2696 2697 // Proxies have 1 direct method, the constructor 2698 { 2699 mirror::ObjectArray<mirror::ArtMethod>* directs = 2700 AllocArtMethodArray(self, 1); 2701 if (UNLIKELY(directs == NULL)) { 2702 CHECK(self->IsExceptionPending()); // OOME. 2703 return NULL; 2704 } 2705 klass->SetDirectMethods(directs); 2706 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2707 if (UNLIKELY(constructor == NULL)) { 2708 CHECK(self->IsExceptionPending()); // OOME. 2709 return NULL; 2710 } 2711 klass->SetDirectMethod(0, constructor); 2712 } 2713 2714 // Create virtual method using specified prototypes 2715 size_t num_virtual_methods = methods->GetLength(); 2716 { 2717 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2718 AllocArtMethodArray(self, num_virtual_methods); 2719 if (UNLIKELY(virtuals == NULL)) { 2720 CHECK(self->IsExceptionPending()); // OOME. 2721 return NULL; 2722 } 2723 klass->SetVirtualMethods(virtuals); 2724 } 2725 for (size_t i = 0; i < num_virtual_methods; ++i) { 2726 SirtRef<mirror::ArtMethod> prototype(self, methods->Get(i)); 2727 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2728 if (UNLIKELY(clone == NULL)) { 2729 CHECK(self->IsExceptionPending()); // OOME. 2730 return NULL; 2731 } 2732 klass->SetVirtualMethod(i, clone); 2733 } 2734 2735 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2736 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Class is now effectively in the loaded state 2737 self->AssertNoPendingException(); 2738 2739 { 2740 ObjectLock lock(self, klass.get()); // Must hold lock on object when resolved. 2741 // Link the fields and virtual methods, creating vtable and iftables 2742 if (!LinkClass(klass, interfaces, self)) { 2743 klass->SetStatus(mirror::Class::kStatusError, self); 2744 return NULL; 2745 } 2746 2747 interfaces_sfield->SetObject(klass.get(), interfaces); 2748 throws_sfield->SetObject(klass.get(), throws); 2749 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2750 } 2751 2752 // sanity checks 2753 if (kIsDebugBuild) { 2754 CHECK(klass->GetIFields() == NULL); 2755 CheckProxyConstructor(klass->GetDirectMethod(0)); 2756 for (size_t i = 0; i < num_virtual_methods; ++i) { 2757 SirtRef<mirror::ArtMethod> prototype(self, methods->Get(i)); 2758 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2759 } 2760 2761 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2762 name->ToModifiedUtf8().c_str())); 2763 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2764 2765 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2766 name->ToModifiedUtf8().c_str())); 2767 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2768 2769 mirror::SynthesizedProxyClass* synth_proxy_class = 2770 down_cast<mirror::SynthesizedProxyClass*>(klass.get()); 2771 CHECK_EQ(synth_proxy_class->GetInterfaces(), interfaces); 2772 CHECK_EQ(synth_proxy_class->GetThrows(), throws); 2773 } 2774 std::string descriptor(GetDescriptorForProxy(klass.get())); 2775 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.get(), Hash(descriptor.c_str())); 2776 CHECK(existing == nullptr); 2777 return klass.get(); 2778 } 2779 2780 std::string ClassLinker::GetDescriptorForProxy(const mirror::Class* proxy_class) { 2781 DCHECK(proxy_class->IsProxyClass()); 2782 mirror::String* name = proxy_class->GetName(); 2783 DCHECK(name != NULL); 2784 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2785 } 2786 2787 mirror::ArtMethod* ClassLinker::FindMethodForProxy(const mirror::Class* proxy_class, 2788 const mirror::ArtMethod* proxy_method) { 2789 DCHECK(proxy_class->IsProxyClass()); 2790 DCHECK(proxy_method->IsProxyMethod()); 2791 // Locate the dex cache of the original interface/Object 2792 mirror::DexCache* dex_cache = NULL; 2793 { 2794 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2795 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2796 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2797 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2798 dex_cache = dex_caches_[i]; 2799 break; 2800 } 2801 } 2802 } 2803 CHECK(dex_cache != NULL); 2804 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2805 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2806 CHECK(resolved_method != NULL); 2807 return resolved_method; 2808 } 2809 2810 2811 mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2812 SirtRef<mirror::Class>& klass, 2813 mirror::Class* proxy_class) { 2814 // Create constructor for Proxy that must initialize h 2815 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2816 proxy_class->GetDirectMethods(); 2817 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2818 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2819 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2820 // code_ too) 2821 mirror::ArtMethod* constructor = 2822 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2823 if (constructor == NULL) { 2824 CHECK(self->IsExceptionPending()); // OOME. 2825 return NULL; 2826 } 2827 // Make this constructor public and fix the class to be our Proxy version 2828 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2829 constructor->SetDeclaringClass(klass.get()); 2830 return constructor; 2831 } 2832 2833 static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2834 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2835 CHECK(constructor->IsConstructor()); 2836 MethodHelper mh(constructor); 2837 CHECK_STREQ(mh.GetName(), "<init>"); 2838 CHECK_EQ(mh.GetSignature(), std::string("(Ljava/lang/reflect/InvocationHandler;)V")); 2839 DCHECK(constructor->IsPublic()); 2840 } 2841 2842 mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, SirtRef<mirror::Class>& klass, 2843 SirtRef<mirror::ArtMethod>& prototype) { 2844 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2845 // prototype method 2846 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2847 prototype.get()); 2848 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2849 // as necessary 2850 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 2851 if (UNLIKELY(method == NULL)) { 2852 CHECK(self->IsExceptionPending()); // OOME. 2853 return NULL; 2854 } 2855 2856 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 2857 // the intersection of throw exceptions as defined in Proxy 2858 method->SetDeclaringClass(klass.get()); 2859 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 2860 2861 // At runtime the method looks like a reference and argument saving method, clone the code 2862 // related parameters from this method. 2863 mirror::ArtMethod* refs_and_args = 2864 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 2865 method->SetCoreSpillMask(refs_and_args->GetCoreSpillMask()); 2866 method->SetFpSpillMask(refs_and_args->GetFpSpillMask()); 2867 method->SetFrameSizeInBytes(refs_and_args->GetFrameSizeInBytes()); 2868 method->SetEntryPointFromCompiledCode(GetProxyInvokeHandler()); 2869 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2870 2871 return method; 2872 } 2873 2874 static void CheckProxyMethod(mirror::ArtMethod* method, 2875 SirtRef<mirror::ArtMethod>& prototype) 2876 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2877 // Basic sanity 2878 CHECK(!prototype->IsFinal()); 2879 CHECK(method->IsFinal()); 2880 CHECK(!method->IsAbstract()); 2881 2882 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 2883 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 2884 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 2885 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 2886 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 2887 CHECK_EQ(prototype->GetDexCacheInitializedStaticStorage(), 2888 method->GetDexCacheInitializedStaticStorage()); 2889 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 2890 2891 MethodHelper mh(method); 2892 MethodHelper mh2(prototype.get()); 2893 CHECK_STREQ(mh.GetName(), mh2.GetName()); 2894 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 2895 // More complex sanity - via dex cache 2896 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 2897 } 2898 2899 static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 2900 bool can_init_parents) 2901 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2902 if (can_init_statics && can_init_statics) { 2903 return true; 2904 } 2905 if (!can_init_statics) { 2906 // Check if there's a class initializer. 2907 mirror::ArtMethod* clinit = klass->FindDeclaredDirectMethod("<clinit>", "()V"); 2908 if (clinit != NULL) { 2909 return false; 2910 } 2911 // Check if there are encoded static values needing initialization. 2912 if (klass->NumStaticFields() != 0) { 2913 ClassHelper kh(klass); 2914 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 2915 DCHECK(dex_class_def != NULL); 2916 if (dex_class_def->static_values_off_ != 0) { 2917 return false; 2918 } 2919 } 2920 } 2921 if (!klass->IsInterface() && klass->HasSuperClass()) { 2922 mirror::Class* super_class = klass->GetSuperClass(); 2923 if (!can_init_parents && !super_class->IsInitialized()) { 2924 return false; 2925 } else { 2926 if (!CanWeInitializeClass(super_class, can_init_statics, true)) { 2927 return false; 2928 } 2929 } 2930 } 2931 return true; 2932 } 2933 2934 bool ClassLinker::InitializeClass(mirror::Class* klass, bool can_init_statics, 2935 bool can_init_parents) { 2936 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 2937 2938 // Are we already initialized and therefore done? 2939 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 2940 // an initialized class will never change its state. 2941 if (klass->IsInitialized()) { 2942 return true; 2943 } 2944 2945 // Fast fail if initialization requires a full runtime. Not part of the JLS. 2946 if (!CanWeInitializeClass(klass, can_init_statics, can_init_parents)) { 2947 return false; 2948 } 2949 2950 Thread* self = Thread::Current(); 2951 uint64_t t0; 2952 { 2953 ObjectLock lock(self, klass); 2954 2955 // Re-check under the lock in case another thread initialized ahead of us. 2956 if (klass->IsInitialized()) { 2957 return true; 2958 } 2959 2960 // Was the class already found to be erroneous? Done under the lock to match the JLS. 2961 if (klass->IsErroneous()) { 2962 ThrowEarlierClassFailure(klass); 2963 return false; 2964 } 2965 2966 CHECK(klass->IsResolved()) << PrettyClass(klass) << ": state=" << klass->GetStatus(); 2967 2968 if (!klass->IsVerified()) { 2969 VerifyClass(klass); 2970 if (!klass->IsVerified()) { 2971 // We failed to verify, expect either the klass to be erroneous or verification failed at 2972 // compile time. 2973 if (klass->IsErroneous()) { 2974 CHECK(self->IsExceptionPending()); 2975 } else { 2976 CHECK(Runtime::Current()->IsCompiler()); 2977 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2978 } 2979 return false; 2980 } 2981 } 2982 2983 // If the class is kStatusInitializing, either this thread is 2984 // initializing higher up the stack or another thread has beat us 2985 // to initializing and we need to wait. Either way, this 2986 // invocation of InitializeClass will not be responsible for 2987 // running <clinit> and will return. 2988 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 2989 // We caught somebody else in the act; was it us? 2990 if (klass->GetClinitThreadId() == self->GetTid()) { 2991 // Yes. That's fine. Return so we can continue initializing. 2992 return true; 2993 } 2994 // No. That's fine. Wait for another thread to finish initializing. 2995 return WaitForInitializeClass(klass, self, lock); 2996 } 2997 2998 if (!ValidateSuperClassDescriptors(klass)) { 2999 klass->SetStatus(mirror::Class::kStatusError, self); 3000 return false; 3001 } 3002 3003 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass); 3004 3005 // From here out other threads may observe that we're initializing and so changes of state 3006 // require the a notification. 3007 klass->SetClinitThreadId(self->GetTid()); 3008 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3009 3010 t0 = NanoTime(); 3011 } 3012 3013 // Initialize super classes, must be done while initializing for the JLS. 3014 if (!klass->IsInterface() && klass->HasSuperClass()) { 3015 mirror::Class* super_class = klass->GetSuperClass(); 3016 if (!super_class->IsInitialized()) { 3017 CHECK(!super_class->IsInterface()); 3018 CHECK(can_init_parents); 3019 bool super_initialized = InitializeClass(super_class, can_init_statics, true); 3020 if (!super_initialized) { 3021 // The super class was verified ahead of entering initializing, we should only be here if 3022 // the super class became erroneous due to initialization. 3023 CHECK(super_class->IsErroneous() && self->IsExceptionPending()) 3024 << "Super class initialization failed for " << PrettyDescriptor(super_class) 3025 << " that has unexpected status " << super_class->GetStatus() 3026 << "\nPending exception:\n" 3027 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3028 ObjectLock lock(self, klass); 3029 // Initialization failed because the super-class is erroneous. 3030 klass->SetStatus(mirror::Class::kStatusError, self); 3031 return false; 3032 } 3033 } 3034 } 3035 3036 if (klass->NumStaticFields() > 0) { 3037 ClassHelper kh(klass); 3038 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3039 CHECK(dex_class_def != NULL); 3040 const DexFile& dex_file = kh.GetDexFile(); 3041 EncodedStaticFieldValueIterator it(dex_file, kh.GetDexCache(), klass->GetClassLoader(), 3042 this, *dex_class_def); 3043 if (it.HasNext()) { 3044 CHECK(can_init_statics); 3045 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 3046 SafeMap<uint32_t, mirror::ArtField*> field_map; 3047 ConstructFieldMap(dex_file, *dex_class_def, klass, field_map); 3048 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3049 it.ReadValueToField(field_map.Get(i)); 3050 } 3051 } 3052 } 3053 3054 mirror::ArtMethod* clinit = klass->FindDeclaredDirectMethod("<clinit>", "()V"); 3055 if (clinit != NULL) { 3056 CHECK(can_init_statics); 3057 if (LIKELY(Runtime::Current()->IsStarted())) { 3058 JValue result; 3059 clinit->Invoke(self, NULL, 0, &result, 'V'); 3060 } else { 3061 art::interpreter::EnterInterpreterFromInvoke(self, clinit, NULL, NULL, NULL); 3062 } 3063 } 3064 3065 // Opportunistically set static method trampolines to their destination. 3066 FixupStaticTrampolines(klass); 3067 3068 uint64_t t1 = NanoTime(); 3069 3070 bool success = true; 3071 { 3072 ObjectLock lock(self, klass); 3073 3074 if (self->IsExceptionPending()) { 3075 WrapExceptionInInitializer(); 3076 klass->SetStatus(mirror::Class::kStatusError, self); 3077 success = false; 3078 } else { 3079 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3080 RuntimeStats* thread_stats = self->GetStats(); 3081 ++global_stats->class_init_count; 3082 ++thread_stats->class_init_count; 3083 global_stats->class_init_time_ns += (t1 - t0); 3084 thread_stats->class_init_time_ns += (t1 - t0); 3085 // Set the class as initialized except if failed to initialize static fields. 3086 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3087 if (VLOG_IS_ON(class_linker)) { 3088 ClassHelper kh(klass); 3089 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 3090 } 3091 } 3092 } 3093 return success; 3094 } 3095 3096 bool ClassLinker::WaitForInitializeClass(mirror::Class* klass, Thread* self, ObjectLock& lock) 3097 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3098 while (true) { 3099 self->AssertNoPendingException(); 3100 CHECK(!klass->IsInitialized()); 3101 lock.WaitIgnoringInterrupts(); 3102 3103 // When we wake up, repeat the test for init-in-progress. If 3104 // there's an exception pending (only possible if 3105 // "interruptShouldThrow" was set), bail out. 3106 if (self->IsExceptionPending()) { 3107 WrapExceptionInInitializer(); 3108 klass->SetStatus(mirror::Class::kStatusError, self); 3109 return false; 3110 } 3111 // Spurious wakeup? Go back to waiting. 3112 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3113 continue; 3114 } 3115 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3116 // Compile time initialization failed. 3117 return false; 3118 } 3119 if (klass->IsErroneous()) { 3120 // The caller wants an exception, but it was thrown in a 3121 // different thread. Synthesize one here. 3122 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3123 PrettyDescriptor(klass).c_str()); 3124 return false; 3125 } 3126 if (klass->IsInitialized()) { 3127 return true; 3128 } 3129 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass) << " is " << klass->GetStatus(); 3130 } 3131 LOG(FATAL) << "Not Reached" << PrettyClass(klass); 3132 } 3133 3134 bool ClassLinker::ValidateSuperClassDescriptors(const mirror::Class* klass) { 3135 if (klass->IsInterface()) { 3136 return true; 3137 } 3138 // begin with the methods local to the superclass 3139 if (klass->HasSuperClass() && 3140 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3141 const mirror::Class* super = klass->GetSuperClass(); 3142 for (int i = super->GetVTable()->GetLength() - 1; i >= 0; --i) { 3143 const mirror::ArtMethod* method = klass->GetVTable()->Get(i); 3144 if (method != super->GetVTable()->Get(i) && 3145 !IsSameMethodSignatureInDifferentClassContexts(method, super, klass)) { 3146 ThrowLinkageError(klass, "Class %s method %s resolves differently in superclass %s", 3147 PrettyDescriptor(klass).c_str(), PrettyMethod(method).c_str(), 3148 PrettyDescriptor(super).c_str()); 3149 return false; 3150 } 3151 } 3152 } 3153 mirror::IfTable* iftable = klass->GetIfTable(); 3154 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3155 mirror::Class* interface = iftable->GetInterface(i); 3156 if (klass->GetClassLoader() != interface->GetClassLoader()) { 3157 for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { 3158 const mirror::ArtMethod* method = iftable->GetMethodArray(i)->Get(j); 3159 if (!IsSameMethodSignatureInDifferentClassContexts(method, interface, 3160 method->GetDeclaringClass())) { 3161 ThrowLinkageError(klass, "Class %s method %s resolves differently in interface %s", 3162 PrettyDescriptor(method->GetDeclaringClass()).c_str(), 3163 PrettyMethod(method).c_str(), 3164 PrettyDescriptor(interface).c_str()); 3165 return false; 3166 } 3167 } 3168 } 3169 } 3170 return true; 3171 } 3172 3173 // Returns true if classes referenced by the signature of the method are the 3174 // same classes in klass1 as they are in klass2. 3175 bool ClassLinker::IsSameMethodSignatureInDifferentClassContexts(const mirror::ArtMethod* method, 3176 const mirror::Class* klass1, 3177 const mirror::Class* klass2) { 3178 if (klass1 == klass2) { 3179 return true; 3180 } 3181 const DexFile& dex_file = *method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 3182 const DexFile::ProtoId& proto_id = 3183 dex_file.GetMethodPrototype(dex_file.GetMethodId(method->GetDexMethodIndex())); 3184 for (DexFileParameterIterator it(dex_file, proto_id); it.HasNext(); it.Next()) { 3185 const char* descriptor = it.GetDescriptor(); 3186 if (descriptor == NULL) { 3187 break; 3188 } 3189 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3190 // Found a non-primitive type. 3191 if (!IsSameDescriptorInDifferentClassContexts(descriptor, klass1, klass2)) { 3192 return false; 3193 } 3194 } 3195 } 3196 // Check the return type 3197 const char* descriptor = dex_file.GetReturnTypeDescriptor(proto_id); 3198 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3199 if (!IsSameDescriptorInDifferentClassContexts(descriptor, klass1, klass2)) { 3200 return false; 3201 } 3202 } 3203 return true; 3204 } 3205 3206 // Returns true if the descriptor resolves to the same class in the context of klass1 and klass2. 3207 bool ClassLinker::IsSameDescriptorInDifferentClassContexts(const char* descriptor, 3208 const mirror::Class* klass1, 3209 const mirror::Class* klass2) { 3210 CHECK(descriptor != NULL); 3211 CHECK(klass1 != NULL); 3212 CHECK(klass2 != NULL); 3213 if (klass1 == klass2) { 3214 return true; 3215 } 3216 mirror::Class* found1 = FindClass(descriptor, klass1->GetClassLoader()); 3217 if (found1 == NULL) { 3218 Thread::Current()->ClearException(); 3219 } 3220 mirror::Class* found2 = FindClass(descriptor, klass2->GetClassLoader()); 3221 if (found2 == NULL) { 3222 Thread::Current()->ClearException(); 3223 } 3224 return found1 == found2; 3225 } 3226 3227 bool ClassLinker::EnsureInitialized(mirror::Class* c, bool can_init_fields, bool can_init_parents) { 3228 DCHECK(c != NULL); 3229 if (c->IsInitialized()) { 3230 return true; 3231 } 3232 3233 bool success = InitializeClass(c, can_init_fields, can_init_parents); 3234 if (!success) { 3235 Thread* self = Thread::Current(); 3236 CHECK(self->IsExceptionPending() || !can_init_fields || !can_init_parents) << PrettyClass(c); 3237 } 3238 return success; 3239 } 3240 3241 void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3242 mirror::Class* c, SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3243 mirror::ClassLoader* cl = c->GetClassLoader(); 3244 const byte* class_data = dex_file.GetClassData(dex_class_def); 3245 ClassDataItemIterator it(dex_file, class_data); 3246 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3247 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), c->GetDexCache(), cl, true)); 3248 } 3249 } 3250 3251 bool ClassLinker::LinkClass(SirtRef<mirror::Class>& klass, 3252 mirror::ObjectArray<mirror::Class>* interfaces, Thread* self) { 3253 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3254 if (!LinkSuperClass(klass)) { 3255 return false; 3256 } 3257 if (!LinkMethods(klass, interfaces)) { 3258 return false; 3259 } 3260 if (!LinkInstanceFields(klass)) { 3261 return false; 3262 } 3263 if (!LinkStaticFields(klass)) { 3264 return false; 3265 } 3266 CreateReferenceInstanceOffsets(klass); 3267 CreateReferenceStaticOffsets(klass); 3268 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3269 klass->SetStatus(mirror::Class::kStatusResolved, self); 3270 return true; 3271 } 3272 3273 bool ClassLinker::LoadSuperAndInterfaces(SirtRef<mirror::Class>& klass, const DexFile& dex_file) { 3274 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3275 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3276 uint16_t super_class_idx = class_def.superclass_idx_; 3277 if (super_class_idx != DexFile::kDexNoIndex16) { 3278 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.get()); 3279 if (super_class == NULL) { 3280 DCHECK(Thread::Current()->IsExceptionPending()); 3281 return false; 3282 } 3283 // Verify 3284 if (!klass->CanAccess(super_class)) { 3285 ThrowIllegalAccessError(klass.get(), "Class %s extended by class %s is inaccessible", 3286 PrettyDescriptor(super_class).c_str(), 3287 PrettyDescriptor(klass.get()).c_str()); 3288 return false; 3289 } 3290 klass->SetSuperClass(super_class); 3291 } 3292 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3293 if (interfaces != NULL) { 3294 for (size_t i = 0; i < interfaces->Size(); i++) { 3295 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3296 mirror::Class* interface = ResolveType(dex_file, idx, klass.get()); 3297 if (interface == NULL) { 3298 DCHECK(Thread::Current()->IsExceptionPending()); 3299 return false; 3300 } 3301 // Verify 3302 if (!klass->CanAccess(interface)) { 3303 // TODO: the RI seemed to ignore this in my testing. 3304 ThrowIllegalAccessError(klass.get(), "Interface %s implemented by class %s is inaccessible", 3305 PrettyDescriptor(interface).c_str(), 3306 PrettyDescriptor(klass.get()).c_str()); 3307 return false; 3308 } 3309 } 3310 } 3311 // Mark the class as loaded. 3312 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3313 return true; 3314 } 3315 3316 bool ClassLinker::LinkSuperClass(SirtRef<mirror::Class>& klass) { 3317 CHECK(!klass->IsPrimitive()); 3318 mirror::Class* super = klass->GetSuperClass(); 3319 if (klass.get() == GetClassRoot(kJavaLangObject)) { 3320 if (super != NULL) { 3321 ThrowClassFormatError(klass.get(), "java.lang.Object must not have a superclass"); 3322 return false; 3323 } 3324 return true; 3325 } 3326 if (super == NULL) { 3327 ThrowLinkageError(klass.get(), "No superclass defined for class %s", 3328 PrettyDescriptor(klass.get()).c_str()); 3329 return false; 3330 } 3331 // Verify 3332 if (super->IsFinal() || super->IsInterface()) { 3333 ThrowIncompatibleClassChangeError(klass.get(), "Superclass %s of %s is %s", 3334 PrettyDescriptor(super).c_str(), 3335 PrettyDescriptor(klass.get()).c_str(), 3336 super->IsFinal() ? "declared final" : "an interface"); 3337 return false; 3338 } 3339 if (!klass->CanAccess(super)) { 3340 ThrowIllegalAccessError(klass.get(), "Superclass %s is inaccessible to class %s", 3341 PrettyDescriptor(super).c_str(), 3342 PrettyDescriptor(klass.get()).c_str()); 3343 return false; 3344 } 3345 3346 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3347 if (super->IsFinalizable()) { 3348 klass->SetFinalizable(); 3349 } 3350 3351 // Inherit reference flags (if any) from the superclass. 3352 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3353 if (reference_flags != 0) { 3354 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3355 } 3356 // Disallow custom direct subclasses of java.lang.ref.Reference. 3357 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3358 ThrowLinkageError(klass.get(), 3359 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3360 PrettyDescriptor(klass.get()).c_str()); 3361 return false; 3362 } 3363 3364 if (kIsDebugBuild) { 3365 // Ensure super classes are fully resolved prior to resolving fields.. 3366 while (super != NULL) { 3367 CHECK(super->IsResolved()); 3368 super = super->GetSuperClass(); 3369 } 3370 } 3371 return true; 3372 } 3373 3374 // Populate the class vtable and itable. Compute return type indices. 3375 bool ClassLinker::LinkMethods(SirtRef<mirror::Class>& klass, 3376 mirror::ObjectArray<mirror::Class>* interfaces) { 3377 if (klass->IsInterface()) { 3378 // No vtable. 3379 size_t count = klass->NumVirtualMethods(); 3380 if (!IsUint(16, count)) { 3381 ThrowClassFormatError(klass.get(), "Too many methods on interface: %zd", count); 3382 return false; 3383 } 3384 for (size_t i = 0; i < count; ++i) { 3385 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3386 } 3387 // Link interface method tables 3388 return LinkInterfaceMethods(klass, interfaces); 3389 } else { 3390 // Link virtual and interface method tables 3391 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3392 } 3393 return true; 3394 } 3395 3396 bool ClassLinker::LinkVirtualMethods(SirtRef<mirror::Class>& klass) { 3397 Thread* self = Thread::Current(); 3398 if (klass->HasSuperClass()) { 3399 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3400 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3401 CHECK_LE(actual_count, max_count); 3402 // TODO: do not assign to the vtable field until it is fully constructed. 3403 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3404 vtable(self, klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count)); 3405 if (UNLIKELY(vtable.get() == NULL)) { 3406 CHECK(self->IsExceptionPending()); // OOME. 3407 return false; 3408 } 3409 // See if any of our virtual methods override the superclass. 3410 MethodHelper local_mh(NULL, this); 3411 MethodHelper super_mh(NULL, this); 3412 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3413 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3414 local_mh.ChangeMethod(local_method); 3415 size_t j = 0; 3416 for (; j < actual_count; ++j) { 3417 mirror::ArtMethod* super_method = vtable->Get(j); 3418 super_mh.ChangeMethod(super_method); 3419 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3420 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3421 if (super_method->IsFinal()) { 3422 ThrowLinkageError(klass.get(), "Method %s overrides final method in class %s", 3423 PrettyMethod(local_method).c_str(), 3424 super_mh.GetDeclaringClassDescriptor()); 3425 return false; 3426 } 3427 vtable->Set(j, local_method); 3428 local_method->SetMethodIndex(j); 3429 break; 3430 } else { 3431 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3432 << " would have incorrectly overridden the package-private method in " 3433 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3434 } 3435 } 3436 } 3437 if (j == actual_count) { 3438 // Not overriding, append. 3439 vtable->Set(actual_count, local_method); 3440 local_method->SetMethodIndex(actual_count); 3441 actual_count += 1; 3442 } 3443 } 3444 if (!IsUint(16, actual_count)) { 3445 ThrowClassFormatError(klass.get(), "Too many methods defined on class: %zd", actual_count); 3446 return false; 3447 } 3448 // Shrink vtable if possible 3449 CHECK_LE(actual_count, max_count); 3450 if (actual_count < max_count) { 3451 vtable.reset(vtable->CopyOf(self, actual_count)); 3452 if (UNLIKELY(vtable.get() == NULL)) { 3453 CHECK(self->IsExceptionPending()); // OOME. 3454 return false; 3455 } 3456 } 3457 klass->SetVTable(vtable.get()); 3458 } else { 3459 CHECK(klass.get() == GetClassRoot(kJavaLangObject)); 3460 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3461 if (!IsUint(16, num_virtual_methods)) { 3462 ThrowClassFormatError(klass.get(), "Too many methods: %d", num_virtual_methods); 3463 return false; 3464 } 3465 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3466 vtable(self, AllocArtMethodArray(self, num_virtual_methods)); 3467 if (UNLIKELY(vtable.get() == NULL)) { 3468 CHECK(self->IsExceptionPending()); // OOME. 3469 return false; 3470 } 3471 for (size_t i = 0; i < num_virtual_methods; ++i) { 3472 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3473 vtable->Set(i, virtual_method); 3474 virtual_method->SetMethodIndex(i & 0xFFFF); 3475 } 3476 klass->SetVTable(vtable.get()); 3477 } 3478 return true; 3479 } 3480 3481 bool ClassLinker::LinkInterfaceMethods(SirtRef<mirror::Class>& klass, 3482 mirror::ObjectArray<mirror::Class>* interfaces) { 3483 size_t super_ifcount; 3484 if (klass->HasSuperClass()) { 3485 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3486 } else { 3487 super_ifcount = 0; 3488 } 3489 size_t ifcount = super_ifcount; 3490 ClassHelper kh(klass.get(), this); 3491 uint32_t num_interfaces = interfaces == NULL ? kh.NumDirectInterfaces() : interfaces->GetLength(); 3492 ifcount += num_interfaces; 3493 for (size_t i = 0; i < num_interfaces; i++) { 3494 mirror::Class* interface = interfaces == NULL ? kh.GetDirectInterface(i) : interfaces->Get(i); 3495 ifcount += interface->GetIfTableCount(); 3496 } 3497 if (ifcount == 0) { 3498 // Class implements no interfaces. 3499 DCHECK_EQ(klass->GetIfTableCount(), 0); 3500 DCHECK(klass->GetIfTable() == NULL); 3501 return true; 3502 } 3503 if (ifcount == super_ifcount) { 3504 // Class implements same interfaces as parent, are any of these not marker interfaces? 3505 bool has_non_marker_interface = false; 3506 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3507 for (size_t i = 0; i < ifcount; ++i) { 3508 if (super_iftable->GetMethodArrayCount(i) > 0) { 3509 has_non_marker_interface = true; 3510 break; 3511 } 3512 } 3513 if (!has_non_marker_interface) { 3514 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3515 klass->SetIfTable(super_iftable); 3516 return true; 3517 } 3518 } 3519 Thread* self = Thread::Current(); 3520 SirtRef<mirror::IfTable> iftable(self, AllocIfTable(self, ifcount)); 3521 if (UNLIKELY(iftable.get() == NULL)) { 3522 CHECK(self->IsExceptionPending()); // OOME. 3523 return false; 3524 } 3525 if (super_ifcount != 0) { 3526 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3527 for (size_t i = 0; i < super_ifcount; i++) { 3528 mirror::Class* super_interface = super_iftable->GetInterface(i); 3529 iftable->SetInterface(i, super_interface); 3530 } 3531 } 3532 // Flatten the interface inheritance hierarchy. 3533 size_t idx = super_ifcount; 3534 for (size_t i = 0; i < num_interfaces; i++) { 3535 mirror::Class* interface = interfaces == NULL ? kh.GetDirectInterface(i) : interfaces->Get(i); 3536 DCHECK(interface != NULL); 3537 if (!interface->IsInterface()) { 3538 ClassHelper ih(interface); 3539 ThrowIncompatibleClassChangeError(klass.get(), "Class %s implements non-interface class %s", 3540 PrettyDescriptor(klass.get()).c_str(), 3541 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3542 return false; 3543 } 3544 // Check if interface is already in iftable 3545 bool duplicate = false; 3546 for (size_t j = 0; j < idx; j++) { 3547 mirror::Class* existing_interface = iftable->GetInterface(j); 3548 if (existing_interface == interface) { 3549 duplicate = true; 3550 break; 3551 } 3552 } 3553 if (!duplicate) { 3554 // Add this non-duplicate interface. 3555 iftable->SetInterface(idx++, interface); 3556 // Add this interface's non-duplicate super-interfaces. 3557 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3558 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3559 bool super_duplicate = false; 3560 for (size_t k = 0; k < idx; k++) { 3561 mirror::Class* existing_interface = iftable->GetInterface(k); 3562 if (existing_interface == super_interface) { 3563 super_duplicate = true; 3564 break; 3565 } 3566 } 3567 if (!super_duplicate) { 3568 iftable->SetInterface(idx++, super_interface); 3569 } 3570 } 3571 } 3572 } 3573 // Shrink iftable in case duplicates were found 3574 if (idx < ifcount) { 3575 iftable.reset(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3576 if (UNLIKELY(iftable.get() == NULL)) { 3577 CHECK(self->IsExceptionPending()); // OOME. 3578 return false; 3579 } 3580 ifcount = idx; 3581 } else { 3582 CHECK_EQ(idx, ifcount); 3583 } 3584 klass->SetIfTable(iftable.get()); 3585 3586 // If we're an interface, we don't need the vtable pointers, so we're done. 3587 if (klass->IsInterface()) { 3588 return true; 3589 } 3590 std::vector<mirror::ArtMethod*> miranda_list; 3591 MethodHelper vtable_mh(NULL, this); 3592 MethodHelper interface_mh(NULL, this); 3593 for (size_t i = 0; i < ifcount; ++i) { 3594 mirror::Class* interface = iftable->GetInterface(i); 3595 size_t num_methods = interface->NumVirtualMethods(); 3596 if (num_methods > 0) { 3597 mirror::ObjectArray<mirror::ArtMethod>* method_array = 3598 AllocArtMethodArray(self, num_methods); 3599 if (UNLIKELY(method_array == NULL)) { 3600 CHECK(self->IsExceptionPending()); // OOME. 3601 return false; 3602 } 3603 iftable->SetMethodArray(i, method_array); 3604 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3605 for (size_t j = 0; j < num_methods; ++j) { 3606 mirror::ArtMethod* interface_method = interface->GetVirtualMethod(j); 3607 interface_mh.ChangeMethod(interface_method); 3608 int32_t k; 3609 // For each method listed in the interface's method list, find the 3610 // matching method in our class's method list. We want to favor the 3611 // subclass over the superclass, which just requires walking 3612 // back from the end of the vtable. (This only matters if the 3613 // superclass defines a private method and this class redefines 3614 // it -- otherwise it would use the same vtable slot. In .dex files 3615 // those don't end up in the virtual method table, so it shouldn't 3616 // matter which direction we go. We walk it backward anyway.) 3617 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3618 mirror::ArtMethod* vtable_method = vtable->Get(k); 3619 vtable_mh.ChangeMethod(vtable_method); 3620 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3621 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3622 ThrowIllegalAccessError(klass.get(), 3623 "Method '%s' implementing interface method '%s' is not public", 3624 PrettyMethod(vtable_method).c_str(), 3625 PrettyMethod(interface_method).c_str()); 3626 return false; 3627 } 3628 method_array->Set(j, vtable_method); 3629 break; 3630 } 3631 } 3632 if (k < 0) { 3633 SirtRef<mirror::ArtMethod> miranda_method(self, NULL); 3634 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3635 mirror::ArtMethod* mir_method = miranda_list[mir]; 3636 vtable_mh.ChangeMethod(mir_method); 3637 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3638 miranda_method.reset(miranda_list[mir]); 3639 break; 3640 } 3641 } 3642 if (miranda_method.get() == NULL) { 3643 // Point the interface table at a phantom slot. 3644 miranda_method.reset(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3645 if (UNLIKELY(miranda_method.get() == NULL)) { 3646 CHECK(self->IsExceptionPending()); // OOME. 3647 return false; 3648 } 3649 #ifdef MOVING_GARBAGE_COLLECTOR 3650 // TODO: If a methods move then the miranda_list may hold stale references. 3651 UNIMPLEMENTED(FATAL); 3652 #endif 3653 miranda_list.push_back(miranda_method.get()); 3654 } 3655 method_array->Set(j, miranda_method.get()); 3656 } 3657 } 3658 } 3659 } 3660 if (!miranda_list.empty()) { 3661 int old_method_count = klass->NumVirtualMethods(); 3662 int new_method_count = old_method_count + miranda_list.size(); 3663 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3664 if (old_method_count == 0) { 3665 virtuals = AllocArtMethodArray(self, new_method_count); 3666 } else { 3667 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3668 } 3669 if (UNLIKELY(virtuals == NULL)) { 3670 CHECK(self->IsExceptionPending()); // OOME. 3671 return false; 3672 } 3673 klass->SetVirtualMethods(virtuals); 3674 3675 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3676 vtable(self, klass->GetVTableDuringLinking()); 3677 CHECK(vtable.get() != NULL); 3678 int old_vtable_count = vtable->GetLength(); 3679 int new_vtable_count = old_vtable_count + miranda_list.size(); 3680 vtable.reset(vtable->CopyOf(self, new_vtable_count)); 3681 if (UNLIKELY(vtable.get() == NULL)) { 3682 CHECK(self->IsExceptionPending()); // OOME. 3683 return false; 3684 } 3685 for (size_t i = 0; i < miranda_list.size(); ++i) { 3686 mirror::ArtMethod* method = miranda_list[i]; 3687 // Leave the declaring class alone as type indices are relative to it 3688 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3689 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3690 klass->SetVirtualMethod(old_method_count + i, method); 3691 vtable->Set(old_vtable_count + i, method); 3692 } 3693 // TODO: do not assign to the vtable field until it is fully constructed. 3694 klass->SetVTable(vtable.get()); 3695 } 3696 3697 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3698 for (int i = 0; i < vtable->GetLength(); ++i) { 3699 CHECK(vtable->Get(i) != NULL); 3700 } 3701 3702 // klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3703 3704 return true; 3705 } 3706 3707 bool ClassLinker::LinkInstanceFields(SirtRef<mirror::Class>& klass) { 3708 CHECK(klass.get() != NULL); 3709 return LinkFields(klass, false); 3710 } 3711 3712 bool ClassLinker::LinkStaticFields(SirtRef<mirror::Class>& klass) { 3713 CHECK(klass.get() != NULL); 3714 size_t allocated_class_size = klass->GetClassSize(); 3715 bool success = LinkFields(klass, true); 3716 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3717 return success; 3718 } 3719 3720 struct LinkFieldsComparator { 3721 explicit LinkFieldsComparator(FieldHelper* fh) 3722 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 3723 : fh_(fh) {} 3724 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3725 bool operator()(const mirror::ArtField* field1, const mirror::ArtField* field2) 3726 NO_THREAD_SAFETY_ANALYSIS { 3727 // First come reference fields, then 64-bit, and finally 32-bit 3728 fh_->ChangeField(field1); 3729 Primitive::Type type1 = fh_->GetTypeAsPrimitiveType(); 3730 fh_->ChangeField(field2); 3731 Primitive::Type type2 = fh_->GetTypeAsPrimitiveType(); 3732 bool isPrimitive1 = type1 != Primitive::kPrimNot; 3733 bool isPrimitive2 = type2 != Primitive::kPrimNot; 3734 bool is64bit1 = isPrimitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3735 bool is64bit2 = isPrimitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3736 int order1 = (!isPrimitive1 ? 0 : (is64bit1 ? 1 : 2)); 3737 int order2 = (!isPrimitive2 ? 0 : (is64bit2 ? 1 : 2)); 3738 if (order1 != order2) { 3739 return order1 < order2; 3740 } 3741 3742 // same basic group? then sort by string. 3743 fh_->ChangeField(field1); 3744 StringPiece name1(fh_->GetName()); 3745 fh_->ChangeField(field2); 3746 StringPiece name2(fh_->GetName()); 3747 return name1 < name2; 3748 } 3749 3750 FieldHelper* fh_; 3751 }; 3752 3753 bool ClassLinker::LinkFields(SirtRef<mirror::Class>& klass, bool is_static) { 3754 size_t num_fields = 3755 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3756 3757 mirror::ObjectArray<mirror::ArtField>* fields = 3758 is_static ? klass->GetSFields() : klass->GetIFields(); 3759 3760 // Initialize size and field_offset 3761 size_t size; 3762 MemberOffset field_offset(0); 3763 if (is_static) { 3764 size = klass->GetClassSize(); 3765 field_offset = mirror::Class::FieldsOffset(); 3766 } else { 3767 mirror::Class* super_class = klass->GetSuperClass(); 3768 if (super_class != NULL) { 3769 CHECK(super_class->IsResolved()); 3770 field_offset = MemberOffset(super_class->GetObjectSize()); 3771 } 3772 size = field_offset.Uint32Value(); 3773 } 3774 3775 CHECK_EQ(num_fields == 0, fields == NULL); 3776 3777 // we want a relatively stable order so that adding new fields 3778 // minimizes disruption of C++ version such as Class and Method. 3779 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3780 for (size_t i = 0; i < num_fields; i++) { 3781 grouped_and_sorted_fields.push_back(fields->Get(i)); 3782 } 3783 FieldHelper fh(NULL, this); 3784 std::sort(grouped_and_sorted_fields.begin(), 3785 grouped_and_sorted_fields.end(), 3786 LinkFieldsComparator(&fh)); 3787 3788 // References should be at the front. 3789 size_t current_field = 0; 3790 size_t num_reference_fields = 0; 3791 for (; current_field < num_fields; current_field++) { 3792 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3793 fh.ChangeField(field); 3794 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3795 bool isPrimitive = type != Primitive::kPrimNot; 3796 if (isPrimitive) { 3797 break; // past last reference, move on to the next phase 3798 } 3799 grouped_and_sorted_fields.pop_front(); 3800 num_reference_fields++; 3801 fields->Set(current_field, field); 3802 field->SetOffset(field_offset); 3803 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3804 } 3805 3806 // Now we want to pack all of the double-wide fields together. If 3807 // we're not aligned, though, we want to shuffle one 32-bit field 3808 // into place. If we can't find one, we'll have to pad it. 3809 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3810 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3811 mirror::ArtField* field = grouped_and_sorted_fields[i]; 3812 fh.ChangeField(field); 3813 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3814 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3815 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 3816 continue; 3817 } 3818 fields->Set(current_field++, field); 3819 field->SetOffset(field_offset); 3820 // drop the consumed field 3821 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 3822 break; 3823 } 3824 // whether we found a 32-bit field for padding or not, we advance 3825 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3826 } 3827 3828 // Alignment is good, shuffle any double-wide fields forward, and 3829 // finish assigning field offsets to all fields. 3830 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 3831 while (!grouped_and_sorted_fields.empty()) { 3832 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3833 grouped_and_sorted_fields.pop_front(); 3834 fh.ChangeField(field); 3835 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3836 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3837 fields->Set(current_field, field); 3838 field->SetOffset(field_offset); 3839 field_offset = MemberOffset(field_offset.Uint32Value() + 3840 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 3841 ? sizeof(uint64_t) 3842 : sizeof(uint32_t))); 3843 current_field++; 3844 } 3845 3846 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 3847 if (!is_static && 3848 StringPiece(ClassHelper(klass.get(), this).GetDescriptor()) == "Ljava/lang/ref/Reference;") { 3849 // We know there are no non-reference fields in the Reference classes, and we know 3850 // that 'referent' is alphabetically last, so this is easy... 3851 CHECK_EQ(num_reference_fields, num_fields); 3852 fh.ChangeField(fields->Get(num_fields - 1)); 3853 CHECK_STREQ(fh.GetName(), "referent"); 3854 --num_reference_fields; 3855 } 3856 3857 #ifndef NDEBUG 3858 // Make sure that all reference fields appear before 3859 // non-reference fields, and all double-wide fields are aligned. 3860 bool seen_non_ref = false; 3861 for (size_t i = 0; i < num_fields; i++) { 3862 mirror::ArtField* field = fields->Get(i); 3863 if (false) { // enable to debug field layout 3864 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 3865 << " class=" << PrettyClass(klass.get()) 3866 << " field=" << PrettyField(field) 3867 << " offset=" << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset()), 3868 false); 3869 } 3870 fh.ChangeField(field); 3871 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3872 bool is_primitive = type != Primitive::kPrimNot; 3873 if (StringPiece(ClassHelper(klass.get(), this).GetDescriptor()) == "Ljava/lang/ref/Reference;" && 3874 StringPiece(fh.GetName()) == "referent") { 3875 is_primitive = true; // We lied above, so we have to expect a lie here. 3876 } 3877 if (is_primitive) { 3878 if (!seen_non_ref) { 3879 seen_non_ref = true; 3880 DCHECK_EQ(num_reference_fields, i); 3881 } 3882 } else { 3883 DCHECK(!seen_non_ref); 3884 } 3885 } 3886 if (!seen_non_ref) { 3887 DCHECK_EQ(num_fields, num_reference_fields); 3888 } 3889 #endif 3890 size = field_offset.Uint32Value(); 3891 // Update klass 3892 if (is_static) { 3893 klass->SetNumReferenceStaticFields(num_reference_fields); 3894 klass->SetClassSize(size); 3895 } else { 3896 klass->SetNumReferenceInstanceFields(num_reference_fields); 3897 if (!klass->IsVariableSize()) { 3898 DCHECK_GE(size, sizeof(mirror::Object)) << ClassHelper(klass.get(), this).GetDescriptor(); 3899 klass->SetObjectSize(size); 3900 } 3901 } 3902 return true; 3903 } 3904 3905 // Set the bitmap of reference offsets, refOffsets, from the ifields 3906 // list. 3907 void ClassLinker::CreateReferenceInstanceOffsets(SirtRef<mirror::Class>& klass) { 3908 uint32_t reference_offsets = 0; 3909 mirror::Class* super_class = klass->GetSuperClass(); 3910 if (super_class != NULL) { 3911 reference_offsets = super_class->GetReferenceInstanceOffsets(); 3912 // If our superclass overflowed, we don't stand a chance. 3913 if (reference_offsets == CLASS_WALK_SUPER) { 3914 klass->SetReferenceInstanceOffsets(reference_offsets); 3915 return; 3916 } 3917 } 3918 CreateReferenceOffsets(klass, false, reference_offsets); 3919 } 3920 3921 void ClassLinker::CreateReferenceStaticOffsets(SirtRef<mirror::Class>& klass) { 3922 CreateReferenceOffsets(klass, true, 0); 3923 } 3924 3925 void ClassLinker::CreateReferenceOffsets(SirtRef<mirror::Class>& klass, bool is_static, 3926 uint32_t reference_offsets) { 3927 size_t num_reference_fields = 3928 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 3929 : klass->NumReferenceInstanceFieldsDuringLinking(); 3930 const mirror::ObjectArray<mirror::ArtField>* fields = 3931 is_static ? klass->GetSFields() : klass->GetIFields(); 3932 // All of the fields that contain object references are guaranteed 3933 // to be at the beginning of the fields list. 3934 for (size_t i = 0; i < num_reference_fields; ++i) { 3935 // Note that byte_offset is the offset from the beginning of 3936 // object, not the offset into instance data 3937 const mirror::ArtField* field = fields->Get(i); 3938 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 3939 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 3940 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 3941 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 3942 CHECK_NE(new_bit, 0U); 3943 reference_offsets |= new_bit; 3944 } else { 3945 reference_offsets = CLASS_WALK_SUPER; 3946 break; 3947 } 3948 } 3949 // Update fields in klass 3950 if (is_static) { 3951 klass->SetReferenceStaticOffsets(reference_offsets); 3952 } else { 3953 klass->SetReferenceInstanceOffsets(reference_offsets); 3954 } 3955 } 3956 3957 mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, 3958 uint32_t string_idx, mirror::DexCache* dex_cache) { 3959 DCHECK(dex_cache != NULL); 3960 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 3961 if (resolved != NULL) { 3962 return resolved; 3963 } 3964 const DexFile::StringId& string_id = dex_file.GetStringId(string_idx); 3965 int32_t utf16_length = dex_file.GetStringLength(string_id); 3966 const char* utf8_data = dex_file.GetStringData(string_id); 3967 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 3968 dex_cache->SetResolvedString(string_idx, string); 3969 return string; 3970 } 3971 3972 mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, 3973 uint16_t type_idx, 3974 mirror::DexCache* dex_cache, 3975 mirror::ClassLoader* class_loader) { 3976 DCHECK(dex_cache != NULL); 3977 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 3978 if (resolved == NULL) { 3979 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 3980 resolved = FindClass(descriptor, class_loader); 3981 if (resolved != NULL) { 3982 // TODO: we used to throw here if resolved's class loader was not the 3983 // boot class loader. This was to permit different classes with the 3984 // same name to be loaded simultaneously by different loaders 3985 dex_cache->SetResolvedType(type_idx, resolved); 3986 } else { 3987 Thread* self = Thread::Current(); 3988 CHECK(self->IsExceptionPending()) 3989 << "Expected pending exception for failed resolution of: " << descriptor; 3990 // Convert a ClassNotFoundException to a NoClassDefFoundError. 3991 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 3992 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 3993 Thread::Current()->ClearException(); 3994 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 3995 self->GetException(NULL)->SetCause(cause.get()); 3996 } 3997 } 3998 } 3999 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4000 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4001 return resolved; 4002 } 4003 4004 mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 4005 uint32_t method_idx, 4006 mirror::DexCache* dex_cache, 4007 mirror::ClassLoader* class_loader, 4008 const mirror::ArtMethod* referrer, 4009 InvokeType type) { 4010 DCHECK(dex_cache != NULL); 4011 // Check for hit in the dex cache. 4012 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4013 if (resolved != NULL) { 4014 return resolved; 4015 } 4016 // Fail, get the declaring class. 4017 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4018 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4019 if (klass == NULL) { 4020 DCHECK(Thread::Current()->IsExceptionPending()); 4021 return NULL; 4022 } 4023 // Scan using method_idx, this saves string compares but will only hit for matching dex 4024 // caches/files. 4025 switch (type) { 4026 case kDirect: // Fall-through. 4027 case kStatic: 4028 resolved = klass->FindDirectMethod(dex_cache, method_idx); 4029 break; 4030 case kInterface: 4031 resolved = klass->FindInterfaceMethod(dex_cache, method_idx); 4032 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4033 break; 4034 case kSuper: // Fall-through. 4035 case kVirtual: 4036 resolved = klass->FindVirtualMethod(dex_cache, method_idx); 4037 break; 4038 default: 4039 LOG(FATAL) << "Unreachable - invocation type: " << type; 4040 } 4041 if (resolved == NULL) { 4042 // Search by name, which works across dex files. 4043 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4044 std::string signature(dex_file.CreateMethodSignature(method_id.proto_idx_, NULL)); 4045 switch (type) { 4046 case kDirect: // Fall-through. 4047 case kStatic: 4048 resolved = klass->FindDirectMethod(name, signature); 4049 break; 4050 case kInterface: 4051 resolved = klass->FindInterfaceMethod(name, signature); 4052 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4053 break; 4054 case kSuper: // Fall-through. 4055 case kVirtual: 4056 resolved = klass->FindVirtualMethod(name, signature); 4057 break; 4058 } 4059 } 4060 if (resolved != NULL) { 4061 // We found a method, check for incompatible class changes. 4062 if (resolved->CheckIncompatibleClassChange(type)) { 4063 resolved = NULL; 4064 } 4065 } 4066 if (resolved != NULL) { 4067 // Be a good citizen and update the dex cache to speed subsequent calls. 4068 dex_cache->SetResolvedMethod(method_idx, resolved); 4069 return resolved; 4070 } else { 4071 // We failed to find the method which means either an access error, an incompatible class 4072 // change, or no such method. First try to find the method among direct and virtual methods. 4073 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4074 std::string signature(dex_file.CreateMethodSignature(method_id.proto_idx_, NULL)); 4075 switch (type) { 4076 case kDirect: 4077 case kStatic: 4078 resolved = klass->FindVirtualMethod(name, signature); 4079 break; 4080 case kInterface: 4081 case kVirtual: 4082 case kSuper: 4083 resolved = klass->FindDirectMethod(name, signature); 4084 break; 4085 } 4086 4087 // If we found something, check that it can be accessed by the referrer. 4088 if (resolved != NULL && referrer != NULL) { 4089 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4090 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4091 if (!referring_class->CanAccess(methods_class)) { 4092 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4093 referrer, resolved, type); 4094 return NULL; 4095 } else if (!referring_class->CanAccessMember(methods_class, 4096 resolved->GetAccessFlags())) { 4097 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4098 return NULL; 4099 } 4100 } 4101 4102 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4103 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4104 switch (type) { 4105 case kDirect: 4106 case kStatic: 4107 if (resolved != NULL) { 4108 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4109 } else { 4110 resolved = klass->FindInterfaceMethod(name, signature); 4111 if (resolved != NULL) { 4112 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4113 } else { 4114 ThrowNoSuchMethodError(type, klass, name, signature); 4115 } 4116 } 4117 break; 4118 case kInterface: 4119 if (resolved != NULL) { 4120 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4121 } else { 4122 resolved = klass->FindVirtualMethod(name, signature); 4123 if (resolved != NULL) { 4124 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4125 } else { 4126 ThrowNoSuchMethodError(type, klass, name, signature); 4127 } 4128 } 4129 break; 4130 case kSuper: 4131 ThrowNoSuchMethodError(type, klass, name, signature); 4132 break; 4133 case kVirtual: 4134 if (resolved != NULL) { 4135 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4136 } else { 4137 resolved = klass->FindInterfaceMethod(name, signature); 4138 if (resolved != NULL) { 4139 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4140 } else { 4141 ThrowNoSuchMethodError(type, klass, name, signature); 4142 } 4143 } 4144 break; 4145 } 4146 DCHECK(Thread::Current()->IsExceptionPending()); 4147 return NULL; 4148 } 4149 } 4150 4151 mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, 4152 uint32_t field_idx, 4153 mirror::DexCache* dex_cache, 4154 mirror::ClassLoader* class_loader, 4155 bool is_static) { 4156 DCHECK(dex_cache != NULL); 4157 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4158 if (resolved != NULL) { 4159 return resolved; 4160 } 4161 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4162 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4163 if (klass == NULL) { 4164 DCHECK(Thread::Current()->IsExceptionPending()); 4165 return NULL; 4166 } 4167 4168 if (is_static) { 4169 resolved = klass->FindStaticField(dex_cache, field_idx); 4170 } else { 4171 resolved = klass->FindInstanceField(dex_cache, field_idx); 4172 } 4173 4174 if (resolved == NULL) { 4175 const char* name = dex_file.GetFieldName(field_id); 4176 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4177 if (is_static) { 4178 resolved = klass->FindStaticField(name, type); 4179 } else { 4180 resolved = klass->FindInstanceField(name, type); 4181 } 4182 if (resolved == NULL) { 4183 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 4184 return NULL; 4185 } 4186 } 4187 dex_cache->SetResolvedField(field_idx, resolved); 4188 return resolved; 4189 } 4190 4191 mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4192 uint32_t field_idx, 4193 mirror::DexCache* dex_cache, 4194 mirror::ClassLoader* class_loader) { 4195 DCHECK(dex_cache != NULL); 4196 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4197 if (resolved != NULL) { 4198 return resolved; 4199 } 4200 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4201 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4202 if (klass == NULL) { 4203 DCHECK(Thread::Current()->IsExceptionPending()); 4204 return NULL; 4205 } 4206 4207 const char* name = dex_file.GetFieldName(field_id); 4208 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4209 resolved = klass->FindField(name, type); 4210 if (resolved != NULL) { 4211 dex_cache->SetResolvedField(field_idx, resolved); 4212 } else { 4213 ThrowNoSuchFieldError("", klass, type, name); 4214 } 4215 return resolved; 4216 } 4217 4218 const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4219 uint32_t* length) { 4220 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4221 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4222 const DexFile& dex_file = *dex_cache->GetDexFile(); 4223 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4224 return dex_file.GetMethodShorty(method_id, length); 4225 } 4226 4227 void ClassLinker::DumpAllClasses(int flags) { 4228 if (dex_cache_image_class_lookup_required_) { 4229 MoveImageClassesToClassTable(); 4230 } 4231 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4232 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4233 std::vector<mirror::Class*> all_classes; 4234 { 4235 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4236 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 4237 all_classes.push_back(it.second); 4238 } 4239 } 4240 4241 for (size_t i = 0; i < all_classes.size(); ++i) { 4242 all_classes[i]->DumpClass(std::cerr, flags); 4243 } 4244 } 4245 4246 void ClassLinker::DumpForSigQuit(std::ostream& os) { 4247 if (dex_cache_image_class_lookup_required_) { 4248 MoveImageClassesToClassTable(); 4249 } 4250 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4251 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4252 } 4253 4254 size_t ClassLinker::NumLoadedClasses() { 4255 if (dex_cache_image_class_lookup_required_) { 4256 MoveImageClassesToClassTable(); 4257 } 4258 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4259 return class_table_.size(); 4260 } 4261 4262 pid_t ClassLinker::GetClassesLockOwner() { 4263 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4264 } 4265 4266 pid_t ClassLinker::GetDexLockOwner() { 4267 return dex_lock_.GetExclusiveOwnerTid(); 4268 } 4269 4270 void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4271 DCHECK(!init_done_); 4272 4273 DCHECK(klass != NULL); 4274 DCHECK(klass->GetClassLoader() == NULL); 4275 4276 DCHECK(class_roots_ != NULL); 4277 DCHECK(class_roots_->Get(class_root) == NULL); 4278 class_roots_->Set(class_root, klass); 4279 } 4280 4281 } // namespace art 4282
