class_linker.cc revision 8d31bbd3d6536de12bc20e3d29cfe03fe848f9da
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 71namespace art { 72 73static void ThrowNoClassDefFoundError(const char* fmt, ...) 74 __attribute__((__format__(__printf__, 1, 2))) 75 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 76static 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 85static 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 108static 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 126static 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 135const 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 173ClassLinker* 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 181ClassLinker* 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 187ClassLinker::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 203void 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 470void 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 532void 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 543bool ClassLinker::GenerateOatFile(const char* dex_filename, 544 int oat_fd, 545 const char* oat_cache_filename) { 546 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 547 std::string dex2oat_string(GetAndroidRoot()); 548 dex2oat_string += (kIsDebugBuild ? "/bin/dex2oatd" : "/bin/dex2oat"); 549 const char* dex2oat = dex2oat_string.c_str(); 550 551 const char* class_path = Runtime::Current()->GetClassPathString().c_str(); 552 553 gc::Heap* heap = Runtime::Current()->GetHeap(); 554 std::string boot_image_option_string("--boot-image="); 555 boot_image_option_string += heap->GetImageSpace()->GetImageFilename(); 556 const char* boot_image_option = boot_image_option_string.c_str(); 557 558 std::string dex_file_option_string("--dex-file="); 559 dex_file_option_string += dex_filename; 560 const char* dex_file_option = dex_file_option_string.c_str(); 561 562 std::string oat_fd_option_string("--oat-fd="); 563 StringAppendF(&oat_fd_option_string, "%d", oat_fd); 564 const char* oat_fd_option = oat_fd_option_string.c_str(); 565 566 std::string oat_location_option_string("--oat-location="); 567 oat_location_option_string += oat_cache_filename; 568 const char* oat_location_option = oat_location_option_string.c_str(); 569 570 std::string oat_compiler_filter_string("-compiler-filter:"); 571 Runtime::CompilerFilter filter = Runtime::Current()->GetCompilerFilter(); 572 switch (filter) { 573 case Runtime::kInterpretOnly: 574 oat_compiler_filter_string += "interpret-only"; 575 break; 576 case Runtime::kSpace: 577 oat_compiler_filter_string += "space"; 578 break; 579 case Runtime::kBalanced: 580 oat_compiler_filter_string += "balanced"; 581 break; 582 case Runtime::kSpeed: 583 oat_compiler_filter_string += "speed"; 584 break; 585 case Runtime::kEverything: 586 oat_compiler_filter_string += "everything"; 587 break; 588 default: 589 LOG(FATAL) << "Unexpected case: " << filter; 590 } 591 const char* oat_compiler_filter_option = oat_compiler_filter_string.c_str(); 592 593 // fork and exec dex2oat 594 pid_t pid = fork(); 595 if (pid == 0) { 596 // no allocation allowed between fork and exec 597 598 // change process groups, so we don't get reaped by ProcessManager 599 setpgid(0, 0); 600 601 // gLogVerbosity.class_linker = true; 602 VLOG(class_linker) << dex2oat 603 << " --runtime-arg -Xms64m" 604 << " --runtime-arg -Xmx64m" 605 << " --runtime-arg -classpath" 606 << " --runtime-arg " << class_path 607 << " --runtime-arg " << oat_compiler_filter_option 608#if !defined(ART_TARGET) 609 << " --host" 610#endif 611 << " " << boot_image_option 612 << " " << dex_file_option 613 << " " << oat_fd_option 614 << " " << oat_location_option; 615 616 execl(dex2oat, dex2oat, 617 "--runtime-arg", "-Xms64m", 618 "--runtime-arg", "-Xmx64m", 619 "--runtime-arg", "-classpath", 620 "--runtime-arg", class_path, 621 "--runtime-arg", oat_compiler_filter_option, 622#if !defined(ART_TARGET) 623 "--host", 624#endif 625 boot_image_option, 626 dex_file_option, 627 oat_fd_option, 628 oat_location_option, 629 NULL); 630 631 PLOG(FATAL) << "execl(" << dex2oat << ") failed"; 632 return false; 633 } else { 634 // wait for dex2oat to finish 635 int status; 636 pid_t got_pid = TEMP_FAILURE_RETRY(waitpid(pid, &status, 0)); 637 if (got_pid != pid) { 638 ScopedObjectAccess soa(Thread::Current()); 639 ThrowIOException("Failed to create oat file. Waitpid failed: wanted %d, got %d", pid, 640 got_pid); 641 return false; 642 } 643 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { 644 ScopedObjectAccess soa(Thread::Current()); 645 ThrowIOException("Failed to create oat file. %s failed with dex-file '%s'", dex2oat, 646 dex_filename); 647 return false; 648 } 649 } 650 return true; 651} 652 653const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 654 WriterMutexLock mu(Thread::Current(), dex_lock_); 655 for (size_t i = 0; i < oat_files_.size(); ++i) { 656 if (UNLIKELY(oat_file->GetLocation() == oat_files_[i]->GetLocation())) { 657 VLOG(class_linker) << "Attempt to register oat file that's already registered: " 658 << oat_file->GetLocation(); 659 for (size_t j = i; j < oat_files_.size(); ++j) { 660 CHECK_NE(oat_file, oat_files_[j]) << "Attempt to re-register dex file."; 661 } 662 delete oat_file; 663 return oat_files_[i]; 664 } 665 } 666 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 667 oat_files_.push_back(oat_file); 668 return oat_file; 669} 670 671OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 672 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 673 OatFile* oat_file = space->ReleaseOatFile(); 674 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 675 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 676 return *oat_file; 677} 678 679const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 680 return FindOpenedOatFileFromDexLocation(dex_file.GetLocation().c_str(), 681 dex_file.GetLocationChecksum()); 682} 683 684const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation(const char* dex_location, 685 uint32_t dex_location_checksum) { 686 ReaderMutexLock mu(Thread::Current(), dex_lock_); 687 for (size_t i = 0; i < oat_files_.size(); i++) { 688 const OatFile* oat_file = oat_files_[i]; 689 DCHECK(oat_file != NULL); 690 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 691 &dex_location_checksum, 692 false); 693 if (oat_dex_file != NULL) { 694 return oat_file; 695 } 696 } 697 return NULL; 698} 699 700const DexFile* ClassLinker::FindDexFileInOatLocation(const char* dex_location, 701 uint32_t dex_location_checksum, 702 const char* oat_location, 703 std::string* error_msg) { 704 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 705 !Runtime::Current()->IsCompiler(), 706 error_msg)); 707 if (oat_file.get() == nullptr) { 708 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 709 error_msg->c_str()); 710 return nullptr; 711 } 712 Runtime* runtime = Runtime::Current(); 713 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 714 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 715 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 716 if (expected_image_oat_checksum != actual_image_oat_checksum) { 717 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 718 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 719 actual_image_oat_checksum); 720 return nullptr; 721 } 722 723 uint32_t expected_image_oat_offset = reinterpret_cast<uint32_t>(image_header.GetOatDataBegin()); 724 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 725 if (expected_image_oat_offset != actual_image_oat_offset) { 726 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %ud, " 727 "found %ud", oat_location, expected_image_oat_offset, 728 actual_image_oat_offset); 729 return nullptr; 730 } 731 // TODO: this registers the oat file now as we may use the oat_dex_file later and we want the 732 // intern behavior of RegisterOatFile. However, if we take an early return we could remove 733 // the oat file. 734 const OatFile* opened_oat_file = RegisterOatFile(oat_file.release()); 735 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, 736 &dex_location_checksum); 737 if (oat_dex_file == nullptr) { 738 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 739 dex_location); 740 return nullptr; 741 } 742 uint32_t expected_dex_checksum = dex_location_checksum; 743 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 744 if (expected_dex_checksum != actual_dex_checksum) { 745 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 746 "found 0x%x", oat_location, expected_dex_checksum, 747 actual_dex_checksum); 748 return nullptr; 749 } 750 return oat_dex_file->OpenDexFile(error_msg); 751} 752 753class ScopedFlock { 754 public: 755 ScopedFlock() {} 756 757 bool Init(const char* filename, std::string* error_msg) { 758 while (true) { 759 file_.reset(OS::OpenFileWithFlags(filename, O_CREAT | O_RDWR)); 760 if (file_.get() == NULL) { 761 *error_msg = StringPrintf("Failed to open file '%s'", filename); 762 return false; 763 } 764 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_EX)); 765 if (flock_result != 0) { 766 *error_msg = StringPrintf("Failed to lock file '%s': %s", filename, strerror(errno)); 767 return false; 768 } 769 struct stat fstat_stat; 770 int fstat_result = TEMP_FAILURE_RETRY(fstat(file_->Fd(), &fstat_stat)); 771 if (fstat_result != 0) { 772 *error_msg = StringPrintf("Failed to fstat file '%s': %s", filename, strerror(errno)); 773 return false; 774 } 775 struct stat stat_stat; 776 int stat_result = TEMP_FAILURE_RETRY(stat(filename, &stat_stat)); 777 if (stat_result != 0) { 778 PLOG(WARNING) << "Failed to stat, will retry: " << filename; 779 // ENOENT can happen if someone racing with us unlinks the file we created so just retry. 780 continue; 781 } 782 if (fstat_stat.st_dev != stat_stat.st_dev || fstat_stat.st_ino != stat_stat.st_ino) { 783 LOG(WARNING) << "File changed while locking, will retry: " << filename; 784 continue; 785 } 786 return true; 787 } 788 } 789 790 File& GetFile() { 791 return *file_; 792 } 793 794 ~ScopedFlock() { 795 if (file_.get() != NULL) { 796 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_UN)); 797 CHECK_EQ(0, flock_result); 798 } 799 } 800 801 private: 802 UniquePtr<File> file_; 803 804 DISALLOW_COPY_AND_ASSIGN(ScopedFlock); 805}; 806 807const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation(const char* dex_location, 808 uint32_t dex_location_checksum, 809 const char* oat_location, 810 std::string* error_msg) { 811 // We play a locking game here so that if two different processes 812 // race to generate (or worse, one tries to open a partial generated 813 // file) we will be okay. This is actually common with apps that use 814 // DexClassLoader to work around the dex method reference limit and 815 // that have a background service running in a separate process. 816 ScopedFlock scoped_flock; 817 if (!scoped_flock.Init(oat_location, error_msg)) { 818 return nullptr; 819 } 820 821 // Check if we already have an up-to-date output file 822 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, dex_location_checksum, 823 oat_location, error_msg); 824 if (dex_file != nullptr) { 825 return dex_file; 826 } 827 VLOG(class_linker) << "Failed to find dex file '" << dex_location << "' in oat location '" 828 << oat_location << "': " << *error_msg; 829 error_msg->clear(); 830 831 // Generate the output oat file for the dex file 832 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 833 if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location)) { 834 CHECK(Thread::Current()->IsExceptionPending()); 835 return nullptr; 836 } 837 const OatFile* oat_file = OatFile::Open(oat_location, oat_location, NULL, 838 !Runtime::Current()->IsCompiler(), 839 error_msg); 840 if (oat_file == nullptr) { 841 *error_msg = StringPrintf("Failed to open generated oat file '%s': %s", 842 oat_location, error_msg->c_str()); 843 return nullptr; 844 } 845 oat_file = RegisterOatFile(oat_file); 846 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 847 &dex_location_checksum); 848 if (oat_dex_file == nullptr) { 849 *error_msg = StringPrintf("Failed to find dex file '%s' (checksum 0x%x) in generated out file " 850 "'%s'", dex_location, dex_location_checksum, oat_location); 851 return nullptr; 852 } 853 const DexFile* result = oat_dex_file->OpenDexFile(error_msg); 854 CHECK(result != nullptr) << *error_msg; 855 CHECK_EQ(dex_location_checksum, result->GetLocationChecksum()) 856 << "dex_location=" << dex_location << " oat_location=" << oat_location << std::hex 857 << " dex_location_checksum=" << dex_location_checksum 858 << " DexFile::GetLocationChecksum()=" << result->GetLocationChecksum(); 859 return result; 860} 861 862bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 863 const char* dex_location, 864 uint32_t dex_location_checksum, 865 std::string* error_msg) { 866 Runtime* runtime = Runtime::Current(); 867 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 868 uint32_t image_oat_checksum = image_header.GetOatChecksum(); 869 uint32_t image_oat_data_begin = reinterpret_cast<uint32_t>(image_header.GetOatDataBegin()); 870 bool image_check = ((oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum) 871 && (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 872 873 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 874 if (oat_dex_file == NULL) { 875 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 876 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 877 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 878 for (size_t i = 0; i < oat_dex_files.size(); i++) { 879 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 880 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 881 oat_file->GetLocation().c_str(), 882 oat_dex_file->GetDexFileLocation().c_str()); 883 } 884 return false; 885 } 886 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 887 888 if (image_check && dex_check) { 889 return true; 890 } 891 892 if (!image_check) { 893 ScopedObjectAccess soa(Thread::Current()); 894 mirror::String* oat_location = image_header.GetImageRoot(ImageHeader::kOatLocation)->AsString(); 895 std::string image_file(oat_location->ToModifiedUtf8()); 896 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with '%s' (0x%x, %d)", 897 oat_file->GetLocation().c_str(), 898 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 899 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 900 image_file.c_str(), image_oat_checksum, image_oat_data_begin); 901 } 902 if (!dex_check) { 903 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 904 oat_file->GetLocation().c_str(), 905 oat_dex_file->GetDexFileLocationChecksum(), 906 dex_location, dex_location_checksum); 907 } 908 return false; 909} 910 911const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const std::string& oat_file_location, 912 const char* dex_location, 913 std::string* error_msg, 914 bool* open_failed) { 915 UniquePtr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 916 if (oat_file.get() == nullptr) { 917 *open_failed = true; 918 return nullptr; 919 } 920 *open_failed = false; 921 uint32_t dex_location_checksum; 922 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 923 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 924 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 925 // directory. 926 const OatFile* opened_oat_file = oat_file.release(); 927 opened_oat_file = RegisterOatFile(opened_oat_file); 928 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, NULL); 929 if (oat_dex_file == nullptr) { 930 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 931 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 932 error_msg->c_str()); 933 return nullptr; 934 } 935 return oat_dex_file->OpenDexFile(error_msg); 936 } 937 938 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 939 error_msg); 940 if (!verified) { 941 return nullptr; 942 } 943 const OatFile* opened_oat_file = oat_file.release(); 944 opened_oat_file = RegisterOatFile(opened_oat_file); 945 return opened_oat_file->GetOatDexFile(dex_location, 946 &dex_location_checksum)->OpenDexFile(error_msg); 947} 948 949const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const char* dex_location, 950 uint32_t dex_location_checksum, 951 std::string* error_msg) { 952 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location, 953 dex_location_checksum); 954 if (open_oat_file != nullptr) { 955 const OatFile::OatDexFile* oat_dex_file = open_oat_file->GetOatDexFile(dex_location, 956 &dex_location_checksum); 957 return oat_dex_file->OpenDexFile(error_msg); 958 } 959 960 // Look for an existing file next to dex. for example, for 961 // /foo/bar/baz.jar, look for /foo/bar/baz.odex. 962 std::string odex_filename(OatFile::DexFilenameToOdexFilename(dex_location)); 963 bool open_failed; 964 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(odex_filename, dex_location, 965 error_msg, &open_failed); 966 if (dex_file != nullptr) { 967 return dex_file; 968 } 969 std::string cache_error_msg; 970 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location)); 971 dex_file = VerifyAndOpenDexFileFromOatFile(cache_location, dex_location, &cache_error_msg, 972 &open_failed); 973 if (dex_file != nullptr) { 974 return dex_file; 975 } 976 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 977 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 978 } 979 VLOG(class_linker) << "Failed to open oat file from " << odex_filename 980 << " (error '" << *error_msg << "') or " << cache_location 981 << " (error '" << cache_error_msg << "')."; 982 983 // Try to generate oat file if it wasn't found or was obsolete. 984 error_msg->clear(); 985 return FindOrCreateOatFileForDexLocation(dex_location, dex_location_checksum, 986 cache_location.c_str(), error_msg); 987} 988 989const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 990 ReaderMutexLock mu(Thread::Current(), dex_lock_); 991 for (size_t i = 0; i < oat_files_.size(); i++) { 992 const OatFile* oat_file = oat_files_[i]; 993 DCHECK(oat_file != nullptr); 994 if (oat_file->GetLocation() == oat_location) { 995 return oat_file; 996 } 997 } 998 return nullptr; 999} 1000 1001const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1002 std::string* error_msg) { 1003 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1004 if (oat_file != nullptr) { 1005 return oat_file; 1006 } 1007 1008 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1009 error_msg); 1010 if (oat_file == NULL) { 1011 return NULL; 1012 } 1013 return oat_file; 1014} 1015 1016static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1017 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1018 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1019 1020 DCHECK(obj != NULL); 1021 DCHECK(class_linker != NULL); 1022 1023 if (obj->IsArtMethod()) { 1024 mirror::ArtMethod* method = obj->AsArtMethod(); 1025 if (!method->IsNative()) { 1026 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1027 if (method != Runtime::Current()->GetResolutionMethod()) { 1028 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1029 } 1030 } 1031 } 1032} 1033 1034void ClassLinker::InitFromImage() { 1035 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1036 CHECK(!init_done_); 1037 1038 gc::Heap* heap = Runtime::Current()->GetHeap(); 1039 gc::space::ImageSpace* space = heap->GetImageSpace(); 1040 dex_cache_image_class_lookup_required_ = true; 1041 CHECK(space != NULL); 1042 OatFile& oat_file = GetImageOatFile(space); 1043 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1044 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1045 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 1046 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1047 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1048 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1049 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1050 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1051 1052 mirror::ObjectArray<mirror::Class>* class_roots = 1053 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>(); 1054 class_roots_ = class_roots; 1055 1056 // Special case of setting up the String class early so that we can test arbitrary objects 1057 // as being Strings or not 1058 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1059 1060 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1061 static_cast<uint32_t>(dex_caches->GetLength())); 1062 Thread* self = Thread::Current(); 1063 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1064 SirtRef<mirror::DexCache> dex_cache(self, dex_caches->Get(i)); 1065 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1066 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1067 nullptr); 1068 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1069 std::string error_msg; 1070 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1071 if (dex_file == NULL) { 1072 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1073 << " from within oat file " << oat_file.GetLocation() 1074 << " error '" << error_msg << "'"; 1075 } 1076 1077 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1078 1079 AppendToBootClassPath(*dex_file, dex_cache); 1080 } 1081 1082 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1083 // bitmap walk. 1084 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1085 1086 // Set entry point to interpreter if in InterpretOnly mode. 1087 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1088 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1089 heap->FlushAllocStack(); 1090 heap->GetLiveBitmap()->Walk(InitFromImageInterpretOnlyCallback, this); 1091 } 1092 1093 // reinit class_roots_ 1094 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1095 class_roots_ = class_roots; 1096 1097 // reinit array_iftable_ from any array class instance, they should be == 1098 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1099 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1100 // String class root was set above 1101 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1102 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1103 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1104 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1105 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1106 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1107 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1108 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1109 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1110 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1111 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1112 1113 FinishInit(); 1114 1115 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1116} 1117 1118// Keep in sync with InitCallback. Anything we visit, we need to 1119// reinit references to when reinitializing a ClassLinker from a 1120// mapped image. 1121void ClassLinker::VisitRoots(RootVisitor* visitor, void* arg, bool only_dirty, bool clean_dirty) { 1122 class_roots_ = down_cast<mirror::ObjectArray<mirror::Class>*>(visitor(class_roots_, arg)); 1123 Thread* self = Thread::Current(); 1124 { 1125 ReaderMutexLock mu(self, dex_lock_); 1126 if (!only_dirty || dex_caches_dirty_) { 1127 for (mirror::DexCache*& dex_cache : dex_caches_) { 1128 dex_cache = down_cast<mirror::DexCache*>(visitor(dex_cache, arg)); 1129 DCHECK(dex_cache != nullptr); 1130 } 1131 if (clean_dirty) { 1132 dex_caches_dirty_ = false; 1133 } 1134 } 1135 } 1136 1137 { 1138 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 1139 if (!only_dirty || class_table_dirty_) { 1140 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1141 it.second = down_cast<mirror::Class*>(visitor(it.second, arg)); 1142 DCHECK(it.second != nullptr); 1143 } 1144 if (clean_dirty) { 1145 class_table_dirty_ = false; 1146 } 1147 } 1148 1149 // We deliberately ignore the class roots in the image since we 1150 // handle image roots by using the MS/CMS rescanning of dirty cards. 1151 } 1152 1153 array_iftable_ = reinterpret_cast<mirror::IfTable*>(visitor(array_iftable_, arg)); 1154 DCHECK(array_iftable_ != nullptr); 1155} 1156 1157void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1158 if (dex_cache_image_class_lookup_required_) { 1159 MoveImageClassesToClassTable(); 1160 } 1161 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1162 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 1163 if (!visitor(it.second, arg)) { 1164 return; 1165 } 1166 } 1167} 1168 1169static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1170 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1171 classes->insert(c); 1172 return true; 1173} 1174 1175void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1176 std::set<mirror::Class*> classes; 1177 VisitClasses(GetClassesVisitor, &classes); 1178 for (mirror::Class* klass : classes) { 1179 if (!visitor(klass, arg)) { 1180 return; 1181 } 1182 } 1183} 1184 1185 1186ClassLinker::~ClassLinker() { 1187 mirror::Class::ResetClass(); 1188 mirror::String::ResetClass(); 1189 mirror::ArtField::ResetClass(); 1190 mirror::ArtMethod::ResetClass(); 1191 mirror::BooleanArray::ResetArrayClass(); 1192 mirror::ByteArray::ResetArrayClass(); 1193 mirror::CharArray::ResetArrayClass(); 1194 mirror::DoubleArray::ResetArrayClass(); 1195 mirror::FloatArray::ResetArrayClass(); 1196 mirror::IntArray::ResetArrayClass(); 1197 mirror::LongArray::ResetArrayClass(); 1198 mirror::ShortArray::ResetArrayClass(); 1199 mirror::Throwable::ResetClass(); 1200 mirror::StackTraceElement::ResetClass(); 1201 STLDeleteElements(&boot_class_path_); 1202 STLDeleteElements(&oat_files_); 1203} 1204 1205mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1206 gc::Heap* heap = Runtime::Current()->GetHeap(); 1207 mirror::Class* dex_cache_class = GetClassRoot(kJavaLangDexCache); 1208 SirtRef<mirror::DexCache> dex_cache(self, 1209 down_cast<mirror::DexCache*>(heap->AllocObject(self, dex_cache_class, 1210 dex_cache_class->GetObjectSize()))); 1211 if (dex_cache.get() == NULL) { 1212 return NULL; 1213 } 1214 SirtRef<mirror::String> 1215 location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str())); 1216 if (location.get() == NULL) { 1217 return NULL; 1218 } 1219 SirtRef<mirror::ObjectArray<mirror::String> > 1220 strings(self, AllocStringArray(self, dex_file.NumStringIds())); 1221 if (strings.get() == NULL) { 1222 return NULL; 1223 } 1224 SirtRef<mirror::ObjectArray<mirror::Class> > 1225 types(self, AllocClassArray(self, dex_file.NumTypeIds())); 1226 if (types.get() == NULL) { 1227 return NULL; 1228 } 1229 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 1230 methods(self, AllocArtMethodArray(self, dex_file.NumMethodIds())); 1231 if (methods.get() == NULL) { 1232 return NULL; 1233 } 1234 SirtRef<mirror::ObjectArray<mirror::ArtField> > 1235 fields(self, AllocArtFieldArray(self, dex_file.NumFieldIds())); 1236 if (fields.get() == NULL) { 1237 return NULL; 1238 } 1239 SirtRef<mirror::ObjectArray<mirror::StaticStorageBase> > 1240 initialized_static_storage(self, 1241 AllocObjectArray<mirror::StaticStorageBase>(self, dex_file.NumTypeIds())); 1242 if (initialized_static_storage.get() == NULL) { 1243 return NULL; 1244 } 1245 1246 dex_cache->Init(&dex_file, 1247 location.get(), 1248 strings.get(), 1249 types.get(), 1250 methods.get(), 1251 fields.get(), 1252 initialized_static_storage.get()); 1253 return dex_cache.get(); 1254} 1255 1256mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1257 size_t class_size) { 1258 DCHECK_GE(class_size, sizeof(mirror::Class)); 1259 gc::Heap* heap = Runtime::Current()->GetHeap(); 1260 mirror::Object* k = heap->AllocObject(self, java_lang_Class, class_size); 1261 if (UNLIKELY(k == NULL)) { 1262 CHECK(self->IsExceptionPending()); // OOME. 1263 return NULL; 1264 } 1265 mirror::Class* klass = k->AsClass(); 1266 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1267 klass->SetClassSize(class_size); 1268 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1269 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1270 return klass; 1271} 1272 1273mirror::Class* ClassLinker::AllocClass(Thread* self, size_t class_size) { 1274 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1275} 1276 1277mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1278 return down_cast<mirror::ArtField*>(GetClassRoot(kJavaLangReflectArtField)->AllocObject(self)); 1279} 1280 1281mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1282 return down_cast<mirror::ArtMethod*>(GetClassRoot(kJavaLangReflectArtMethod)->AllocObject(self)); 1283} 1284 1285mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray(Thread* self, 1286 size_t length) { 1287 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc(self, 1288 GetClassRoot(kJavaLangStackTraceElementArrayClass), 1289 length); 1290} 1291 1292static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1293 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1294 DCHECK(klass != NULL); 1295 // Wait for the class if it has not already been linked. 1296 if (!klass->IsResolved() && !klass->IsErroneous()) { 1297 ObjectLock lock(self, klass); 1298 // Check for circular dependencies between classes. 1299 if (!klass->IsResolved() && klass->GetClinitThreadId() == self->GetTid()) { 1300 ThrowClassCircularityError(klass); 1301 klass->SetStatus(mirror::Class::kStatusError, self); 1302 return NULL; 1303 } 1304 // Wait for the pending initialization to complete. 1305 while (!klass->IsResolved() && !klass->IsErroneous()) { 1306 lock.WaitIgnoringInterrupts(); 1307 } 1308 } 1309 if (klass->IsErroneous()) { 1310 ThrowEarlierClassFailure(klass); 1311 return NULL; 1312 } 1313 // Return the loaded class. No exceptions should be pending. 1314 CHECK(klass->IsResolved()) << PrettyClass(klass); 1315 self->AssertNoPendingException(); 1316 return klass; 1317} 1318 1319bool ClassLinker::IsInBootClassPath(const char* descriptor) { 1320 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1321 return pair.second != NULL; 1322} 1323 1324mirror::Class* ClassLinker::FindSystemClass(const char* descriptor) { 1325 return FindClass(descriptor, NULL); 1326} 1327 1328mirror::Class* ClassLinker::FindClass(const char* descriptor, mirror::ClassLoader* class_loader) { 1329 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1330 Thread* self = Thread::Current(); 1331 DCHECK(self != NULL); 1332 self->AssertNoPendingException(); 1333 if (descriptor[1] == '\0') { 1334 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1335 // for primitive classes that aren't backed by dex files. 1336 return FindPrimitiveClass(descriptor[0]); 1337 } 1338 // Find the class in the loaded classes table. 1339 mirror::Class* klass = LookupClass(descriptor, class_loader); 1340 if (klass != NULL) { 1341 return EnsureResolved(self, klass); 1342 } 1343 // Class is not yet loaded. 1344 if (descriptor[0] == '[') { 1345 return CreateArrayClass(descriptor, class_loader); 1346 1347 } else if (class_loader == NULL) { 1348 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1349 if (pair.second != NULL) { 1350 return DefineClass(descriptor, NULL, *pair.first, *pair.second); 1351 } 1352 1353 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1354 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1355 // throw of a NoClassDefFoundError. 1356 if (IsInBootClassPath(descriptor)) { 1357 mirror::Class* system_class = FindSystemClass(descriptor); 1358 CHECK(system_class != NULL); 1359 return system_class; 1360 } 1361 // Next try the compile time class path. 1362 const std::vector<const DexFile*>* class_path; 1363 { 1364 ScopedObjectAccessUnchecked soa(self); 1365 ScopedLocalRef<jobject> jclass_loader(soa.Env(), soa.AddLocalReference<jobject>(class_loader)); 1366 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1367 } 1368 1369 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1370 if (pair.second != NULL) { 1371 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1372 } 1373 1374 } else { 1375 ScopedObjectAccessUnchecked soa(self->GetJniEnv()); 1376 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1377 soa.AddLocalReference<jobject>(class_loader)); 1378 std::string class_name_string(DescriptorToDot(descriptor)); 1379 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1380 { 1381 ScopedThreadStateChange tsc(self, kNative); 1382 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1383 soa.Env()->NewStringUTF(class_name_string.c_str())); 1384 if (class_name_object.get() == NULL) { 1385 return NULL; 1386 } 1387 CHECK(class_loader_object.get() != NULL); 1388 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1389 WellKnownClasses::java_lang_ClassLoader_loadClass, 1390 class_name_object.get())); 1391 } 1392 if (soa.Self()->IsExceptionPending()) { 1393 // If the ClassLoader threw, pass that exception up. 1394 return NULL; 1395 } else if (result.get() == NULL) { 1396 // broken loader - throw NPE to be compatible with Dalvik 1397 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1398 class_name_string.c_str()).c_str()); 1399 return NULL; 1400 } else { 1401 // success, return mirror::Class* 1402 return soa.Decode<mirror::Class*>(result.get()); 1403 } 1404 } 1405 1406 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1407 return NULL; 1408} 1409 1410mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1411 mirror::ClassLoader* class_loader, 1412 const DexFile& dex_file, 1413 const DexFile::ClassDef& dex_class_def) { 1414 Thread* self = Thread::Current(); 1415 SirtRef<mirror::Class> klass(self, NULL); 1416 // Load the class from the dex file. 1417 if (UNLIKELY(!init_done_)) { 1418 // finish up init of hand crafted class_roots_ 1419 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1420 klass.reset(GetClassRoot(kJavaLangObject)); 1421 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1422 klass.reset(GetClassRoot(kJavaLangClass)); 1423 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1424 klass.reset(GetClassRoot(kJavaLangString)); 1425 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1426 klass.reset(GetClassRoot(kJavaLangDexCache)); 1427 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1428 klass.reset(GetClassRoot(kJavaLangReflectArtField)); 1429 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1430 klass.reset(GetClassRoot(kJavaLangReflectArtMethod)); 1431 } else { 1432 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1433 } 1434 } else { 1435 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1436 } 1437 if (UNLIKELY(klass.get() == NULL)) { 1438 CHECK(self->IsExceptionPending()); // Expect an OOME. 1439 return NULL; 1440 } 1441 klass->SetDexCache(FindDexCache(dex_file)); 1442 LoadClass(dex_file, dex_class_def, klass, class_loader); 1443 // Check for a pending exception during load 1444 if (self->IsExceptionPending()) { 1445 klass->SetStatus(mirror::Class::kStatusError, self); 1446 return NULL; 1447 } 1448 ObjectLock lock(self, klass.get()); 1449 klass->SetClinitThreadId(self->GetTid()); 1450 { 1451 // Add the newly loaded class to the loaded classes table. 1452 mirror::Class* existing = InsertClass(descriptor, klass.get(), Hash(descriptor)); 1453 if (existing != NULL) { 1454 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1455 // this thread to block. 1456 return EnsureResolved(self, existing); 1457 } 1458 } 1459 // Finish loading (if necessary) by finding parents 1460 CHECK(!klass->IsLoaded()); 1461 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1462 // Loading failed. 1463 klass->SetStatus(mirror::Class::kStatusError, self); 1464 return NULL; 1465 } 1466 CHECK(klass->IsLoaded()); 1467 // Link the class (if necessary) 1468 CHECK(!klass->IsResolved()); 1469 if (!LinkClass(klass, NULL, self)) { 1470 // Linking failed. 1471 klass->SetStatus(mirror::Class::kStatusError, self); 1472 return NULL; 1473 } 1474 CHECK(klass->IsResolved()); 1475 1476 /* 1477 * We send CLASS_PREPARE events to the debugger from here. The 1478 * definition of "preparation" is creating the static fields for a 1479 * class and initializing them to the standard default values, but not 1480 * executing any code (that comes later, during "initialization"). 1481 * 1482 * We did the static preparation in LinkClass. 1483 * 1484 * The class has been prepared and resolved but possibly not yet verified 1485 * at this point. 1486 */ 1487 Dbg::PostClassPrepare(klass.get()); 1488 1489 return klass.get(); 1490} 1491 1492// Precomputes size that will be needed for Class, matching LinkStaticFields 1493size_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1494 const DexFile::ClassDef& dex_class_def) { 1495 const byte* class_data = dex_file.GetClassData(dex_class_def); 1496 size_t num_ref = 0; 1497 size_t num_32 = 0; 1498 size_t num_64 = 0; 1499 if (class_data != NULL) { 1500 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1501 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1502 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1503 char c = descriptor[0]; 1504 if (c == 'L' || c == '[') { 1505 num_ref++; 1506 } else if (c == 'J' || c == 'D') { 1507 num_64++; 1508 } else { 1509 num_32++; 1510 } 1511 } 1512 } 1513 // start with generic class data 1514 size_t size = sizeof(mirror::Class); 1515 // follow with reference fields which must be contiguous at start 1516 size += (num_ref * sizeof(uint32_t)); 1517 // if there are 64-bit fields to add, make sure they are aligned 1518 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1519 if (num_32 != 0) { 1520 // use an available 32-bit field for padding 1521 num_32--; 1522 } 1523 size += sizeof(uint32_t); // either way, we are adding a word 1524 DCHECK_EQ(size, RoundUp(size, 8)); 1525 } 1526 // tack on any 64-bit fields now that alignment is assured 1527 size += (num_64 * sizeof(uint64_t)); 1528 // tack on any remaining 32-bit fields 1529 size += (num_32 * sizeof(uint32_t)); 1530 return size; 1531} 1532 1533const OatFile::OatClass* ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1534 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1535 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1536 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1537 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1538 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1539 &dex_location_checksum); 1540 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1541 const OatFile::OatClass* oat_class = oat_dex_file->GetOatClass(class_def_idx); 1542 CHECK(oat_class != NULL) << dex_file.GetLocation() << " " << class_def_idx; 1543 return oat_class; 1544} 1545 1546static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1547 uint32_t method_idx) { 1548 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1549 const byte* class_data = dex_file.GetClassData(class_def); 1550 CHECK(class_data != NULL); 1551 ClassDataItemIterator it(dex_file, class_data); 1552 // Skip fields 1553 while (it.HasNextStaticField()) { 1554 it.Next(); 1555 } 1556 while (it.HasNextInstanceField()) { 1557 it.Next(); 1558 } 1559 // Process methods 1560 size_t class_def_method_index = 0; 1561 while (it.HasNextDirectMethod()) { 1562 if (it.GetMemberIndex() == method_idx) { 1563 return class_def_method_index; 1564 } 1565 class_def_method_index++; 1566 it.Next(); 1567 } 1568 while (it.HasNextVirtualMethod()) { 1569 if (it.GetMemberIndex() == method_idx) { 1570 return class_def_method_index; 1571 } 1572 class_def_method_index++; 1573 it.Next(); 1574 } 1575 DCHECK(!it.HasNext()); 1576 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1577 return 0; 1578} 1579 1580const OatFile::OatMethod ClassLinker::GetOatMethodFor(const mirror::ArtMethod* method) { 1581 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1582 // method for direct methods (or virtual methods made direct). 1583 mirror::Class* declaring_class = method->GetDeclaringClass(); 1584 size_t oat_method_index; 1585 if (method->IsStatic() || method->IsDirect()) { 1586 // Simple case where the oat method index was stashed at load time. 1587 oat_method_index = method->GetMethodIndex(); 1588 } else { 1589 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1590 // by search for its position in the declared virtual methods. 1591 oat_method_index = declaring_class->NumDirectMethods(); 1592 size_t end = declaring_class->NumVirtualMethods(); 1593 bool found = false; 1594 for (size_t i = 0; i < end; i++) { 1595 if (declaring_class->GetVirtualMethod(i) == method) { 1596 found = true; 1597 break; 1598 } 1599 oat_method_index++; 1600 } 1601 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1602 } 1603 UniquePtr<const OatFile::OatClass> 1604 oat_class(GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1605 declaring_class->GetDexClassDefIndex())); 1606 CHECK(oat_class.get() != NULL); 1607 DCHECK_EQ(oat_method_index, 1608 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1609 method->GetDeclaringClass()->GetDexClassDefIndex(), 1610 method->GetDexMethodIndex())); 1611 1612 return oat_class->GetOatMethod(oat_method_index); 1613} 1614 1615// Special case to get oat code without overwriting a trampoline. 1616const void* ClassLinker::GetOatCodeFor(const mirror::ArtMethod* method) { 1617 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1618 if (method->IsProxyMethod()) { 1619#if !defined(ART_USE_PORTABLE_COMPILER) 1620 return reinterpret_cast<void*>(art_quick_proxy_invoke_handler); 1621#else 1622 return reinterpret_cast<void*>(art_portable_proxy_invoke_handler); 1623#endif 1624 } 1625 const void* result = GetOatMethodFor(method).GetCode(); 1626 if (result == NULL) { 1627 // No code? You must mean to go into the interpreter. 1628 result = GetCompiledCodeToInterpreterBridge(); 1629 } 1630 return result; 1631} 1632 1633const void* ClassLinker::GetOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1634 uint32_t method_idx) { 1635 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1636 CHECK(oat_class.get() != nullptr); 1637 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1638 return oat_class->GetOatMethod(oat_method_idx).GetCode(); 1639} 1640 1641// Returns true if the method must run with interpreter, false otherwise. 1642static bool NeedsInterpreter(const mirror::ArtMethod* method, const void* code) { 1643 if (code == NULL) { 1644 // No code: need interpreter. 1645 return true; 1646 } 1647#ifdef ART_SEA_IR_MODE 1648 ScopedObjectAccess soa(Thread::Current()); 1649 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1650 LOG(INFO) << "Found " << PrettyMethod(method); 1651 return false; 1652 } 1653#endif 1654 // If interpreter mode is enabled, every method (except native and proxy) must 1655 // be run with interpreter. 1656 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1657 !method->IsNative() && !method->IsProxyMethod(); 1658} 1659 1660void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1661 if (klass->NumDirectMethods() == 0) { 1662 return; // No direct methods => no static methods. 1663 } 1664 Runtime* runtime = Runtime::Current(); 1665 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1666 return; // OAT file unavailable. 1667 } 1668 ClassHelper kh(klass); 1669 const DexFile& dex_file = kh.GetDexFile(); 1670 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 1671 CHECK(dex_class_def != nullptr); 1672 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1673 // There should always be class data if there were direct methods. 1674 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1675 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1676 CHECK(oat_class.get() != nullptr); 1677 ClassDataItemIterator it(dex_file, class_data); 1678 // Skip fields 1679 while (it.HasNextStaticField()) { 1680 it.Next(); 1681 } 1682 while (it.HasNextInstanceField()) { 1683 it.Next(); 1684 } 1685 // Link the code of methods skipped by LinkCode. 1686 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1687 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1688 if (!method->IsStatic()) { 1689 // Only update static methods. 1690 continue; 1691 } 1692 const void* code = oat_class->GetOatMethod(method_index).GetCode(); 1693 const bool enter_interpreter = NeedsInterpreter(method, code); 1694 if (enter_interpreter) { 1695 // Use interpreter entry point. 1696 code = GetCompiledCodeToInterpreterBridge(); 1697 } 1698 runtime->GetInstrumentation()->UpdateMethodsCode(method, code); 1699 } 1700 // Ignore virtual methods on the iterator. 1701} 1702 1703static void LinkCode(SirtRef<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class, 1704 uint32_t method_index) 1705 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1706 // Method shouldn't have already been linked. 1707 DCHECK(method->GetEntryPointFromCompiledCode() == NULL); 1708 // Every kind of method should at least get an invoke stub from the oat_method. 1709 // non-abstract methods also get their code pointers. 1710 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1711 oat_method.LinkMethod(method.get()); 1712 1713 // Install entry point from interpreter. 1714 Runtime* runtime = Runtime::Current(); 1715 bool enter_interpreter = NeedsInterpreter(method.get(), method->GetEntryPointFromCompiledCode()); 1716 if (enter_interpreter) { 1717 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1718 } else { 1719 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1720 } 1721 1722 if (method->IsAbstract()) { 1723 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1724 return; 1725 } 1726 1727 if (method->IsStatic() && !method->IsConstructor()) { 1728 // For static methods excluding the class initializer, install the trampoline. 1729 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1730 // after initializing class (see ClassLinker::InitializeClass method). 1731 method->SetEntryPointFromCompiledCode(GetResolutionTrampoline(runtime->GetClassLinker())); 1732 } else if (enter_interpreter) { 1733 // Set entry point from compiled code if there's no code or in interpreter only mode. 1734 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1735 } 1736 1737 if (method->IsNative()) { 1738 // Unregistering restores the dlsym lookup stub. 1739 method->UnregisterNative(Thread::Current()); 1740 } 1741 1742 // Allow instrumentation its chance to hijack code. 1743 runtime->GetInstrumentation()->UpdateMethodsCode(method.get(), 1744 method->GetEntryPointFromCompiledCode()); 1745} 1746 1747void ClassLinker::LoadClass(const DexFile& dex_file, 1748 const DexFile::ClassDef& dex_class_def, 1749 SirtRef<mirror::Class>& klass, 1750 mirror::ClassLoader* class_loader) { 1751 CHECK(klass.get() != NULL); 1752 CHECK(klass->GetDexCache() != NULL); 1753 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1754 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1755 CHECK(descriptor != NULL); 1756 1757 klass->SetClass(GetClassRoot(kJavaLangClass)); 1758 uint32_t access_flags = dex_class_def.access_flags_; 1759 // Make sure that none of our runtime-only flags are set. 1760 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1761 klass->SetAccessFlags(access_flags); 1762 klass->SetClassLoader(class_loader); 1763 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1764 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1765 1766 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1767 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1768 1769 // Load fields fields. 1770 const byte* class_data = dex_file.GetClassData(dex_class_def); 1771 if (class_data == NULL) { 1772 return; // no fields or methods - for example a marker interface 1773 } 1774 ClassDataItemIterator it(dex_file, class_data); 1775 Thread* self = Thread::Current(); 1776 if (it.NumStaticFields() != 0) { 1777 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1778 if (UNLIKELY(statics == NULL)) { 1779 CHECK(self->IsExceptionPending()); // OOME. 1780 return; 1781 } 1782 klass->SetSFields(statics); 1783 } 1784 if (it.NumInstanceFields() != 0) { 1785 mirror::ObjectArray<mirror::ArtField>* fields = 1786 AllocArtFieldArray(self, it.NumInstanceFields()); 1787 if (UNLIKELY(fields == NULL)) { 1788 CHECK(self->IsExceptionPending()); // OOME. 1789 return; 1790 } 1791 klass->SetIFields(fields); 1792 } 1793 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1794 SirtRef<mirror::ArtField> sfield(self, AllocArtField(self)); 1795 if (UNLIKELY(sfield.get() == NULL)) { 1796 CHECK(self->IsExceptionPending()); // OOME. 1797 return; 1798 } 1799 klass->SetStaticField(i, sfield.get()); 1800 LoadField(dex_file, it, klass, sfield); 1801 } 1802 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1803 SirtRef<mirror::ArtField> ifield(self, AllocArtField(self)); 1804 if (UNLIKELY(ifield.get() == NULL)) { 1805 CHECK(self->IsExceptionPending()); // OOME. 1806 return; 1807 } 1808 klass->SetInstanceField(i, ifield.get()); 1809 LoadField(dex_file, it, klass, ifield); 1810 } 1811 1812 UniquePtr<const OatFile::OatClass> oat_class; 1813 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1814 oat_class.reset(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1815 } 1816 1817 // Load methods. 1818 if (it.NumDirectMethods() != 0) { 1819 // TODO: append direct methods to class object 1820 mirror::ObjectArray<mirror::ArtMethod>* directs = 1821 AllocArtMethodArray(self, it.NumDirectMethods()); 1822 if (UNLIKELY(directs == NULL)) { 1823 CHECK(self->IsExceptionPending()); // OOME. 1824 return; 1825 } 1826 klass->SetDirectMethods(directs); 1827 } 1828 if (it.NumVirtualMethods() != 0) { 1829 // TODO: append direct methods to class object 1830 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1831 AllocArtMethodArray(self, it.NumVirtualMethods()); 1832 if (UNLIKELY(virtuals == NULL)) { 1833 CHECK(self->IsExceptionPending()); // OOME. 1834 return; 1835 } 1836 klass->SetVirtualMethods(virtuals); 1837 } 1838 size_t class_def_method_index = 0; 1839 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1840 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1841 if (UNLIKELY(method.get() == NULL)) { 1842 CHECK(self->IsExceptionPending()); // OOME. 1843 return; 1844 } 1845 klass->SetDirectMethod(i, method.get()); 1846 if (oat_class.get() != NULL) { 1847 LinkCode(method, oat_class.get(), class_def_method_index); 1848 } 1849 method->SetMethodIndex(class_def_method_index); 1850 class_def_method_index++; 1851 } 1852 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1853 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1854 if (UNLIKELY(method.get() == NULL)) { 1855 CHECK(self->IsExceptionPending()); // OOME. 1856 return; 1857 } 1858 klass->SetVirtualMethod(i, method.get()); 1859 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1860 if (oat_class.get() != NULL) { 1861 LinkCode(method, oat_class.get(), class_def_method_index); 1862 } 1863 class_def_method_index++; 1864 } 1865 DCHECK(!it.HasNext()); 1866} 1867 1868void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1869 SirtRef<mirror::Class>& klass, SirtRef<mirror::ArtField>& dst) { 1870 uint32_t field_idx = it.GetMemberIndex(); 1871 dst->SetDexFieldIndex(field_idx); 1872 dst->SetDeclaringClass(klass.get()); 1873 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1874} 1875 1876mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1877 const ClassDataItemIterator& it, 1878 SirtRef<mirror::Class>& klass) { 1879 uint32_t dex_method_idx = it.GetMemberIndex(); 1880 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1881 StringPiece method_name(dex_file.StringDataAsStringPieceByIdx(method_id.name_idx_)); 1882 1883 mirror::ArtMethod* dst = AllocArtMethod(self); 1884 if (UNLIKELY(dst == NULL)) { 1885 CHECK(self->IsExceptionPending()); // OOME. 1886 return NULL; 1887 } 1888 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 1889 1890 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 1891 dst->SetDexMethodIndex(dex_method_idx); 1892 dst->SetDeclaringClass(klass.get()); 1893 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 1894 1895 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 1896 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 1897 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 1898 dst->SetDexCacheInitializedStaticStorage(klass->GetDexCache()->GetInitializedStaticStorage()); 1899 1900 uint32_t access_flags = it.GetMemberAccessFlags(); 1901 1902 if (UNLIKELY(method_name == "finalize")) { 1903 // Set finalizable flag on declaring class. 1904 const DexFile::ProtoId& proto = dex_file.GetProtoId(method_id.proto_idx_); 1905 if (dex_file.GetProtoParameters(proto) == NULL) { // No arguments 1906 const DexFile::TypeId& return_type = dex_file.GetTypeId(proto.return_type_idx_); 1907 if (dex_file.StringDataAsStringPieceByIdx(return_type.descriptor_idx_) == "V") { 1908 // Void return type. 1909 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 1910 klass->SetFinalizable(); 1911 } else { 1912 ClassHelper kh(klass.get()); 1913 StringPiece klass_descriptor(kh.GetDescriptorAsStringPiece()); 1914 // The Enum class declares a "final" finalize() method to prevent subclasses from 1915 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 1916 // subclasses, so we exclude it here. 1917 // We also want to avoid setting the flag on Object, where we know that finalize() is 1918 // empty. 1919 if (klass_descriptor != "Ljava/lang/Object;" && 1920 klass_descriptor != "Ljava/lang/Enum;") { 1921 klass->SetFinalizable(); 1922 } 1923 } 1924 } 1925 } 1926 } else if (method_name[0] == '<') { 1927 // Fix broken access flags for initializers. Bug 11157540. 1928 bool is_init = (method_name == "<init>"); 1929 bool is_clinit = !is_init && (method_name == "<clinit>"); 1930 if (UNLIKELY(!is_init && !is_clinit)) { 1931 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 1932 } else { 1933 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 1934 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 1935 << PrettyDescriptor(klass.get()) << " in dex file " << dex_file.GetLocation(); 1936 access_flags |= kAccConstructor; 1937 } 1938 } 1939 } 1940 dst->SetAccessFlags(access_flags); 1941 1942 self->EndAssertNoThreadSuspension(old_cause); 1943 return dst; 1944} 1945 1946void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 1947 Thread* self = Thread::Current(); 1948 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1949 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 1950 AppendToBootClassPath(dex_file, dex_cache); 1951} 1952 1953void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1954 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1955 boot_class_path_.push_back(&dex_file); 1956 RegisterDexFile(dex_file, dex_cache); 1957} 1958 1959bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 1960 dex_lock_.AssertSharedHeld(Thread::Current()); 1961 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1962 if (dex_caches_[i]->GetDexFile() == &dex_file) { 1963 return true; 1964 } 1965 } 1966 return false; 1967} 1968 1969bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 1970 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1971 return IsDexFileRegisteredLocked(dex_file); 1972} 1973 1974void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1975 dex_lock_.AssertExclusiveHeld(Thread::Current()); 1976 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1977 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 1978 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 1979 dex_caches_.push_back(dex_cache.get()); 1980 dex_cache->SetDexFile(&dex_file); 1981 dex_caches_dirty_ = true; 1982} 1983 1984void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 1985 Thread* self = Thread::Current(); 1986 { 1987 ReaderMutexLock mu(self, dex_lock_); 1988 if (IsDexFileRegisteredLocked(dex_file)) { 1989 return; 1990 } 1991 } 1992 // Don't alloc while holding the lock, since allocation may need to 1993 // suspend all threads and another thread may need the dex_lock_ to 1994 // get to a suspend point. 1995 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1996 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 1997 { 1998 WriterMutexLock mu(self, dex_lock_); 1999 if (IsDexFileRegisteredLocked(dex_file)) { 2000 return; 2001 } 2002 RegisterDexFileLocked(dex_file, dex_cache); 2003 } 2004} 2005 2006void ClassLinker::RegisterDexFile(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 2007 WriterMutexLock mu(Thread::Current(), dex_lock_); 2008 RegisterDexFileLocked(dex_file, dex_cache); 2009} 2010 2011mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 2012 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2013 // Search assuming unique-ness of dex file. 2014 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2015 mirror::DexCache* dex_cache = dex_caches_[i]; 2016 if (dex_cache->GetDexFile() == &dex_file) { 2017 return dex_cache; 2018 } 2019 } 2020 // Search matching by location name. 2021 std::string location(dex_file.GetLocation()); 2022 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2023 mirror::DexCache* dex_cache = dex_caches_[i]; 2024 if (dex_cache->GetDexFile()->GetLocation() == location) { 2025 return dex_cache; 2026 } 2027 } 2028 // Failure, dump diagnostic and abort. 2029 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2030 mirror::DexCache* dex_cache = dex_caches_[i]; 2031 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2032 } 2033 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2034 return NULL; 2035} 2036 2037void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 2038 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2039 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2040 dex_caches_[i]->Fixup(resolution_method); 2041 } 2042} 2043 2044mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2045 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2046 if (UNLIKELY(klass == NULL)) { 2047 return NULL; 2048 } 2049 return InitializePrimitiveClass(klass, type); 2050} 2051 2052mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, Primitive::Type type) { 2053 CHECK(primitive_class != NULL); 2054 // Must hold lock on object when initializing. 2055 Thread* self = Thread::Current(); 2056 ObjectLock lock(self, primitive_class); 2057 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2058 primitive_class->SetPrimitiveType(type); 2059 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2060 const char* descriptor = Primitive::Descriptor(type); 2061 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2062 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2063 return primitive_class; 2064} 2065 2066// Create an array class (i.e. the class object for the array, not the 2067// array itself). "descriptor" looks like "[C" or "[[[[B" or 2068// "[Ljava/lang/String;". 2069// 2070// If "descriptor" refers to an array of primitives, look up the 2071// primitive type's internally-generated class object. 2072// 2073// "class_loader" is the class loader of the class that's referring to 2074// us. It's used to ensure that we're looking for the element type in 2075// the right context. It does NOT become the class loader for the 2076// array class; that always comes from the base element class. 2077// 2078// Returns NULL with an exception raised on failure. 2079mirror::Class* ClassLinker::CreateArrayClass(const char* descriptor, 2080 mirror::ClassLoader* class_loader) { 2081 // Identify the underlying component type 2082 CHECK_EQ('[', descriptor[0]); 2083 mirror::Class* component_type = FindClass(descriptor + 1, class_loader); 2084 if (component_type == NULL) { 2085 DCHECK(Thread::Current()->IsExceptionPending()); 2086 return NULL; 2087 } 2088 2089 // See if the component type is already loaded. Array classes are 2090 // always associated with the class loader of their underlying 2091 // element type -- an array of Strings goes with the loader for 2092 // java/lang/String -- so we need to look for it there. (The 2093 // caller should have checked for the existence of the class 2094 // before calling here, but they did so with *their* class loader, 2095 // not the component type's loader.) 2096 // 2097 // If we find it, the caller adds "loader" to the class' initiating 2098 // loader list, which should prevent us from going through this again. 2099 // 2100 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2101 // are the same, because our caller (FindClass) just did the 2102 // lookup. (Even if we get this wrong we still have correct behavior, 2103 // because we effectively do this lookup again when we add the new 2104 // class to the hash table --- necessary because of possible races with 2105 // other threads.) 2106 if (class_loader != component_type->GetClassLoader()) { 2107 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2108 if (new_class != NULL) { 2109 return new_class; 2110 } 2111 } 2112 2113 // Fill out the fields in the Class. 2114 // 2115 // It is possible to execute some methods against arrays, because 2116 // all arrays are subclasses of java_lang_Object_, so we need to set 2117 // up a vtable. We can just point at the one in java_lang_Object_. 2118 // 2119 // Array classes are simple enough that we don't need to do a full 2120 // link step. 2121 Thread* self = Thread::Current(); 2122 SirtRef<mirror::Class> new_class(self, NULL); 2123 if (UNLIKELY(!init_done_)) { 2124 // Classes that were hand created, ie not by FindSystemClass 2125 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2126 new_class.reset(GetClassRoot(kClassArrayClass)); 2127 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2128 new_class.reset(GetClassRoot(kObjectArrayClass)); 2129 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2130 new_class.reset(GetClassRoot(kJavaLangStringArrayClass)); 2131 } else if (strcmp(descriptor, 2132 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2133 new_class.reset(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2134 } else if (strcmp(descriptor, 2135 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2136 new_class.reset(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2137 } else if (strcmp(descriptor, "[C") == 0) { 2138 new_class.reset(GetClassRoot(kCharArrayClass)); 2139 } else if (strcmp(descriptor, "[I") == 0) { 2140 new_class.reset(GetClassRoot(kIntArrayClass)); 2141 } 2142 } 2143 if (new_class.get() == NULL) { 2144 new_class.reset(AllocClass(self, sizeof(mirror::Class))); 2145 if (new_class.get() == NULL) { 2146 return NULL; 2147 } 2148 new_class->SetComponentType(component_type); 2149 } 2150 ObjectLock lock(self, new_class.get()); // Must hold lock on object when initializing. 2151 DCHECK(new_class->GetComponentType() != NULL); 2152 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2153 new_class->SetSuperClass(java_lang_Object); 2154 new_class->SetVTable(java_lang_Object->GetVTable()); 2155 new_class->SetPrimitiveType(Primitive::kPrimNot); 2156 new_class->SetClassLoader(component_type->GetClassLoader()); 2157 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2158 // don't need to set new_class->SetObjectSize(..) 2159 // because Object::SizeOf delegates to Array::SizeOf 2160 2161 2162 // All arrays have java/lang/Cloneable and java/io/Serializable as 2163 // interfaces. We need to set that up here, so that stuff like 2164 // "instanceof" works right. 2165 // 2166 // Note: The GC could run during the call to FindSystemClass, 2167 // so we need to make sure the class object is GC-valid while we're in 2168 // there. Do this by clearing the interface list so the GC will just 2169 // think that the entries are null. 2170 2171 2172 // Use the single, global copies of "interfaces" and "iftable" 2173 // (remember not to free them for arrays). 2174 CHECK(array_iftable_ != NULL); 2175 new_class->SetIfTable(array_iftable_); 2176 2177 // Inherit access flags from the component type. 2178 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2179 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2180 access_flags &= kAccJavaFlagsMask; 2181 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2182 // and remove "interface". 2183 access_flags |= kAccAbstract | kAccFinal; 2184 access_flags &= ~kAccInterface; 2185 2186 new_class->SetAccessFlags(access_flags); 2187 2188 mirror::Class* existing = InsertClass(descriptor, new_class.get(), Hash(descriptor)); 2189 if (existing == NULL) { 2190 return new_class.get(); 2191 } 2192 // Another thread must have loaded the class after we 2193 // started but before we finished. Abandon what we've 2194 // done. 2195 // 2196 // (Yes, this happens.) 2197 2198 return existing; 2199} 2200 2201mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2202 switch (Primitive::GetType(type)) { 2203 case Primitive::kPrimByte: 2204 return GetClassRoot(kPrimitiveByte); 2205 case Primitive::kPrimChar: 2206 return GetClassRoot(kPrimitiveChar); 2207 case Primitive::kPrimDouble: 2208 return GetClassRoot(kPrimitiveDouble); 2209 case Primitive::kPrimFloat: 2210 return GetClassRoot(kPrimitiveFloat); 2211 case Primitive::kPrimInt: 2212 return GetClassRoot(kPrimitiveInt); 2213 case Primitive::kPrimLong: 2214 return GetClassRoot(kPrimitiveLong); 2215 case Primitive::kPrimShort: 2216 return GetClassRoot(kPrimitiveShort); 2217 case Primitive::kPrimBoolean: 2218 return GetClassRoot(kPrimitiveBoolean); 2219 case Primitive::kPrimVoid: 2220 return GetClassRoot(kPrimitiveVoid); 2221 case Primitive::kPrimNot: 2222 break; 2223 } 2224 std::string printable_type(PrintableChar(type)); 2225 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2226 return NULL; 2227} 2228 2229mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2230 size_t hash) { 2231 if (VLOG_IS_ON(class_linker)) { 2232 mirror::DexCache* dex_cache = klass->GetDexCache(); 2233 std::string source; 2234 if (dex_cache != NULL) { 2235 source += " from "; 2236 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2237 } 2238 LOG(INFO) << "Loaded class " << descriptor << source; 2239 } 2240 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2241 mirror::Class* existing = 2242 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2243 if (existing != NULL) { 2244 return existing; 2245 } 2246 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2247 // Check a class loaded with the system class loader matches one in the image if the class 2248 // is in the image. 2249 existing = LookupClassFromImage(descriptor); 2250 if (existing != NULL) { 2251 CHECK(klass == existing); 2252 } 2253 } 2254 Runtime::Current()->GetHeap()->VerifyObject(klass); 2255 class_table_.insert(std::make_pair(hash, klass)); 2256 class_table_dirty_ = true; 2257 return NULL; 2258} 2259 2260bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2261 size_t hash = Hash(descriptor); 2262 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2263 ClassHelper kh; 2264 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2265 ++it) { 2266 mirror::Class* klass = it->second; 2267 kh.ChangeClass(klass); 2268 if (kh.GetDescriptorAsStringPiece() == descriptor && klass->GetClassLoader() == class_loader) { 2269 class_table_.erase(it); 2270 return true; 2271 } 2272 } 2273 return false; 2274} 2275 2276mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2277 const mirror::ClassLoader* class_loader) { 2278 size_t hash = Hash(descriptor); 2279 { 2280 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2281 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2282 if (result != NULL) { 2283 return result; 2284 } 2285 } 2286 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2287 return NULL; 2288 } else { 2289 // Lookup failed but need to search dex_caches_. 2290 mirror::Class* result = LookupClassFromImage(descriptor); 2291 if (result != NULL) { 2292 InsertClass(descriptor, result, hash); 2293 } else { 2294 // Searching the image dex files/caches failed, we don't want to get into this situation 2295 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2296 // classes into the class table. 2297 const int32_t kMaxFailedDexCacheLookups = 1000; 2298 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2299 MoveImageClassesToClassTable(); 2300 } 2301 } 2302 return result; 2303 } 2304} 2305 2306mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2307 const mirror::ClassLoader* class_loader, 2308 size_t hash) { 2309 ClassHelper kh(NULL, this); 2310 auto end = class_table_.end(); 2311 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2312 mirror::Class* klass = it->second; 2313 kh.ChangeClass(klass); 2314 if (klass->GetClassLoader() == class_loader && kh.GetDescriptorAsStringPiece() == descriptor) { 2315 if (kIsDebugBuild) { 2316 // Check for duplicates in the table. 2317 for (++it; it != end && it->first == hash; ++it) { 2318 mirror::Class* klass2 = it->second; 2319 kh.ChangeClass(klass2); 2320 CHECK(!(kh.GetDescriptorAsStringPiece() == descriptor && 2321 klass2->GetClassLoader() == class_loader)) 2322 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2323 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2324 } 2325 } 2326 return klass; 2327 } 2328 } 2329 return NULL; 2330} 2331 2332static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2333 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2334 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2335 CHECK(image != NULL); 2336 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2337 return root->AsObjectArray<mirror::DexCache>(); 2338} 2339 2340void ClassLinker::MoveImageClassesToClassTable() { 2341 Thread* self = Thread::Current(); 2342 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2343 if (!dex_cache_image_class_lookup_required_) { 2344 return; // All dex cache classes are already in the class table. 2345 } 2346 const char* old_no_suspend_cause = 2347 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2348 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2349 ClassHelper kh(NULL, this); 2350 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2351 mirror::DexCache* dex_cache = dex_caches->Get(i); 2352 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2353 for (int32_t j = 0; j < types->GetLength(); j++) { 2354 mirror::Class* klass = types->Get(j); 2355 if (klass != NULL) { 2356 kh.ChangeClass(klass); 2357 DCHECK(klass->GetClassLoader() == NULL); 2358 const char* descriptor = kh.GetDescriptor(); 2359 size_t hash = Hash(descriptor); 2360 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 2361 if (existing != NULL) { 2362 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2363 << PrettyClassAndClassLoader(klass); 2364 } else { 2365 class_table_.insert(std::make_pair(hash, klass)); 2366 } 2367 } 2368 } 2369 } 2370 class_table_dirty_ = true; 2371 dex_cache_image_class_lookup_required_ = false; 2372 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2373} 2374 2375mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2376 Thread* self = Thread::Current(); 2377 const char* old_no_suspend_cause = 2378 self->StartAssertNoThreadSuspension("Image class lookup"); 2379 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2380 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2381 mirror::DexCache* dex_cache = dex_caches->Get(i); 2382 const DexFile* dex_file = dex_cache->GetDexFile(); 2383 // First search using the class def map, but don't bother for non-class types. 2384 if (descriptor[0] == 'L') { 2385 const DexFile::StringId* descriptor_string_id = dex_file->FindStringId(descriptor); 2386 if (descriptor_string_id != NULL) { 2387 const DexFile::TypeId* type_id = 2388 dex_file->FindTypeId(dex_file->GetIndexForStringId(*descriptor_string_id)); 2389 if (type_id != NULL) { 2390 mirror::Class* klass = dex_cache->GetResolvedType(dex_file->GetIndexForTypeId(*type_id)); 2391 if (klass != NULL) { 2392 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2393 return klass; 2394 } 2395 } 2396 } 2397 } 2398 // Now try binary searching the string/type index. 2399 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2400 if (string_id != NULL) { 2401 const DexFile::TypeId* type_id = 2402 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2403 if (type_id != NULL) { 2404 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2405 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2406 if (klass != NULL) { 2407 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2408 return klass; 2409 } 2410 } 2411 } 2412 } 2413 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2414 return NULL; 2415} 2416 2417void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2418 result.clear(); 2419 if (dex_cache_image_class_lookup_required_) { 2420 MoveImageClassesToClassTable(); 2421 } 2422 size_t hash = Hash(descriptor); 2423 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2424 ClassHelper kh(NULL, this); 2425 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2426 it != end && it->first == hash; ++it) { 2427 mirror::Class* klass = it->second; 2428 kh.ChangeClass(klass); 2429 if (kh.GetDescriptorAsStringPiece() == descriptor) { 2430 result.push_back(klass); 2431 } 2432 } 2433} 2434 2435void ClassLinker::VerifyClass(mirror::Class* klass) { 2436 // TODO: assert that the monitor on the Class is held 2437 Thread* self = Thread::Current(); 2438 ObjectLock lock(self, klass); 2439 2440 // Don't attempt to re-verify if already sufficiently verified. 2441 if (klass->IsVerified() || 2442 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2443 return; 2444 } 2445 2446 // The class might already be erroneous, for example at compile time if we attempted to verify 2447 // this class as a parent to another. 2448 if (klass->IsErroneous()) { 2449 ThrowEarlierClassFailure(klass); 2450 return; 2451 } 2452 2453 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2454 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2455 } else { 2456 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2457 << PrettyClass(klass); 2458 CHECK(!Runtime::Current()->IsCompiler()); 2459 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2460 } 2461 2462 // Verify super class. 2463 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 2464 if (super.get() != NULL) { 2465 // Acquire lock to prevent races on verifying the super class. 2466 ObjectLock lock(self, super.get()); 2467 2468 if (!super->IsVerified() && !super->IsErroneous()) { 2469 VerifyClass(super.get()); 2470 } 2471 if (!super->IsCompileTimeVerified()) { 2472 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2473 PrettyDescriptor(klass).c_str(), 2474 PrettyDescriptor(super.get()).c_str())); 2475 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2476 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 2477 if (cause.get() != NULL) { 2478 self->ClearException(); 2479 } 2480 ThrowVerifyError(klass, "%s", error_msg.c_str()); 2481 if (cause.get() != NULL) { 2482 self->GetException(NULL)->SetCause(cause.get()); 2483 } 2484 klass->SetStatus(mirror::Class::kStatusError, self); 2485 return; 2486 } 2487 } 2488 2489 // Try to use verification information from the oat file, otherwise do runtime verification. 2490 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2491 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2492 bool preverified = VerifyClassUsingOatFile(dex_file, klass, oat_file_class_status); 2493 if (oat_file_class_status == mirror::Class::kStatusError) { 2494 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2495 << PrettyDescriptor(klass) << " in " 2496 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2497 ThrowVerifyError(klass, "Rejecting class %s because it failed compile-time verification", 2498 PrettyDescriptor(klass).c_str()); 2499 klass->SetStatus(mirror::Class::kStatusError, self); 2500 return; 2501 } 2502 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2503 std::string error_msg; 2504 if (!preverified) { 2505 verifier_failure = verifier::MethodVerifier::VerifyClass(klass, 2506 Runtime::Current()->IsCompiler(), 2507 &error_msg); 2508 } 2509 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2510 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2511 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass) 2512 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2513 << " because: " << error_msg; 2514 } 2515 self->AssertNoPendingException(); 2516 // Make sure all classes referenced by catch blocks are resolved. 2517 ResolveClassExceptionHandlerTypes(dex_file, klass); 2518 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2519 // Even though there were no verifier failures we need to respect whether the super-class 2520 // was verified or requiring runtime reverification. 2521 if (super.get() == NULL || super->IsVerified()) { 2522 klass->SetStatus(mirror::Class::kStatusVerified, self); 2523 } else { 2524 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2525 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2526 // Pretend a soft failure occured so that we don't consider the class verified below. 2527 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2528 } 2529 } else { 2530 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2531 // Soft failures at compile time should be retried at runtime. Soft 2532 // failures at runtime will be handled by slow paths in the generated 2533 // code. Set status accordingly. 2534 if (Runtime::Current()->IsCompiler()) { 2535 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2536 } else { 2537 klass->SetStatus(mirror::Class::kStatusVerified, self); 2538 } 2539 } 2540 } else { 2541 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass) 2542 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2543 << " because: " << error_msg; 2544 self->AssertNoPendingException(); 2545 ThrowVerifyError(klass, "%s", error_msg.c_str()); 2546 klass->SetStatus(mirror::Class::kStatusError, self); 2547 } 2548 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2549 // Class is verified so we don't need to do any access check on its methods. 2550 // Let the interpreter know it by setting the kAccPreverified flag onto each 2551 // method. 2552 // Note: we're going here during compilation and at runtime. When we set the 2553 // kAccPreverified flag when compiling image classes, the flag is recorded 2554 // in the image and is set when loading the image. 2555 klass->SetPreverifiedFlagOnAllMethods(); 2556 } 2557} 2558 2559bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2560 mirror::Class::Status& oat_file_class_status) { 2561 // If we're compiling, we can only verify the class using the oat file if 2562 // we are not compiling the image or if the class we're verifying is not part of 2563 // the app. In other words, we will only check for preverification of bootclasspath 2564 // classes. 2565 if (Runtime::Current()->IsCompiler()) { 2566 // Are we compiling the bootclasspath? 2567 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2568 return false; 2569 } 2570 // We are compiling an app (not the image). 2571 2572 // Is this an app class? (I.e. not a bootclasspath class) 2573 if (klass->GetClassLoader() != NULL) { 2574 return false; 2575 } 2576 } 2577 2578 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2579 // Make this work with gtests, which do not set up the image properly. 2580 // TODO: we should clean up gtests to set up the image path properly. 2581 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2582 return false; 2583 } 2584 2585 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2586 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2587 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2588 &dex_location_checksum); 2589 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2590 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2591 UniquePtr<const OatFile::OatClass> oat_class(oat_dex_file->GetOatClass(class_def_index)); 2592 CHECK(oat_class.get() != NULL) 2593 << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2594 << ClassHelper(klass).GetDescriptor(); 2595 oat_file_class_status = oat_class->GetStatus(); 2596 if (oat_file_class_status == mirror::Class::kStatusVerified || 2597 oat_file_class_status == mirror::Class::kStatusInitialized) { 2598 return true; 2599 } 2600 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2601 // Compile time verification failed with a soft error. Compile time verification can fail 2602 // because we have incomplete type information. Consider the following: 2603 // class ... { 2604 // Foo x; 2605 // .... () { 2606 // if (...) { 2607 // v1 gets assigned a type of resolved class Foo 2608 // } else { 2609 // v1 gets assigned a type of unresolved class Bar 2610 // } 2611 // iput x = v1 2612 // } } 2613 // when we merge v1 following the if-the-else it results in Conflict 2614 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2615 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2616 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2617 // at compile time). 2618 return false; 2619 } 2620 if (oat_file_class_status == mirror::Class::kStatusError) { 2621 // Compile time verification failed with a hard error. This is caused by invalid instructions 2622 // in the class. These errors are unrecoverable. 2623 return false; 2624 } 2625 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2626 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2627 // not loading the class. 2628 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2629 // isn't a problem and this case shouldn't occur 2630 return false; 2631 } 2632 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2633 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2634 << ClassHelper(klass).GetDescriptor(); 2635 2636 return false; 2637} 2638 2639void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, mirror::Class* klass) { 2640 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2641 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2642 } 2643 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2644 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2645 } 2646} 2647 2648void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2649 mirror::ArtMethod* method) { 2650 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2651 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2652 if (code_item == NULL) { 2653 return; // native or abstract method 2654 } 2655 if (code_item->tries_size_ == 0) { 2656 return; // nothing to process 2657 } 2658 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2659 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2660 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2661 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2662 CatchHandlerIterator iterator(handlers_ptr); 2663 for (; iterator.HasNext(); iterator.Next()) { 2664 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2665 // unresolved exception types will be ignored by exception delivery 2666 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2667 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2668 if (exception_type == NULL) { 2669 DCHECK(Thread::Current()->IsExceptionPending()); 2670 Thread::Current()->ClearException(); 2671 } 2672 } 2673 } 2674 handlers_ptr = iterator.EndDataPointer(); 2675 } 2676} 2677 2678static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2679static void CheckProxyMethod(mirror::ArtMethod* method, 2680 SirtRef<mirror::ArtMethod>& prototype); 2681 2682mirror::Class* ClassLinker::CreateProxyClass(mirror::String* name, 2683 mirror::ObjectArray<mirror::Class>* interfaces, 2684 mirror::ClassLoader* loader, 2685 mirror::ObjectArray<mirror::ArtMethod>* methods, 2686 mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >* throws) { 2687 Thread* self = Thread::Current(); 2688 SirtRef<mirror::Class> klass(self, AllocClass(self, GetClassRoot(kJavaLangClass), 2689 sizeof(mirror::SynthesizedProxyClass))); 2690 if (klass.get() == NULL) { 2691 CHECK(self->IsExceptionPending()); // OOME. 2692 return NULL; 2693 } 2694 DCHECK(klass->GetClass() != NULL); 2695 klass->SetObjectSize(sizeof(mirror::Proxy)); 2696 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2697 klass->SetClassLoader(loader); 2698 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2699 klass->SetName(name); 2700 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2701 klass->SetDexCache(proxy_class->GetDexCache()); 2702 klass->SetStatus(mirror::Class::kStatusIdx, self); 2703 2704 // Instance fields are inherited, but we add a couple of static fields... 2705 { 2706 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2707 if (UNLIKELY(sfields == NULL)) { 2708 CHECK(self->IsExceptionPending()); // OOME. 2709 return NULL; 2710 } 2711 klass->SetSFields(sfields); 2712 } 2713 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2714 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2715 SirtRef<mirror::ArtField> interfaces_sfield(self, AllocArtField(self)); 2716 if (UNLIKELY(interfaces_sfield.get() == NULL)) { 2717 CHECK(self->IsExceptionPending()); // OOME. 2718 return NULL; 2719 } 2720 klass->SetStaticField(0, interfaces_sfield.get()); 2721 interfaces_sfield->SetDexFieldIndex(0); 2722 interfaces_sfield->SetDeclaringClass(klass.get()); 2723 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2724 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2725 SirtRef<mirror::ArtField> throws_sfield(self, AllocArtField(self)); 2726 if (UNLIKELY(throws_sfield.get() == NULL)) { 2727 CHECK(self->IsExceptionPending()); // OOME. 2728 return NULL; 2729 } 2730 klass->SetStaticField(1, throws_sfield.get()); 2731 throws_sfield->SetDexFieldIndex(1); 2732 throws_sfield->SetDeclaringClass(klass.get()); 2733 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2734 2735 // Proxies have 1 direct method, the constructor 2736 { 2737 mirror::ObjectArray<mirror::ArtMethod>* directs = 2738 AllocArtMethodArray(self, 1); 2739 if (UNLIKELY(directs == NULL)) { 2740 CHECK(self->IsExceptionPending()); // OOME. 2741 return NULL; 2742 } 2743 klass->SetDirectMethods(directs); 2744 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2745 if (UNLIKELY(constructor == NULL)) { 2746 CHECK(self->IsExceptionPending()); // OOME. 2747 return NULL; 2748 } 2749 klass->SetDirectMethod(0, constructor); 2750 } 2751 2752 // Create virtual method using specified prototypes 2753 size_t num_virtual_methods = methods->GetLength(); 2754 { 2755 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2756 AllocArtMethodArray(self, num_virtual_methods); 2757 if (UNLIKELY(virtuals == NULL)) { 2758 CHECK(self->IsExceptionPending()); // OOME. 2759 return NULL; 2760 } 2761 klass->SetVirtualMethods(virtuals); 2762 } 2763 for (size_t i = 0; i < num_virtual_methods; ++i) { 2764 SirtRef<mirror::ArtMethod> prototype(self, methods->Get(i)); 2765 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2766 if (UNLIKELY(clone == NULL)) { 2767 CHECK(self->IsExceptionPending()); // OOME. 2768 return NULL; 2769 } 2770 klass->SetVirtualMethod(i, clone); 2771 } 2772 2773 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2774 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Class is now effectively in the loaded state 2775 self->AssertNoPendingException(); 2776 2777 { 2778 ObjectLock lock(self, klass.get()); // Must hold lock on object when resolved. 2779 // Link the fields and virtual methods, creating vtable and iftables 2780 if (!LinkClass(klass, interfaces, self)) { 2781 klass->SetStatus(mirror::Class::kStatusError, self); 2782 return NULL; 2783 } 2784 2785 interfaces_sfield->SetObject(klass.get(), interfaces); 2786 throws_sfield->SetObject(klass.get(), throws); 2787 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2788 } 2789 2790 // sanity checks 2791 if (kIsDebugBuild) { 2792 CHECK(klass->GetIFields() == NULL); 2793 CheckProxyConstructor(klass->GetDirectMethod(0)); 2794 for (size_t i = 0; i < num_virtual_methods; ++i) { 2795 SirtRef<mirror::ArtMethod> prototype(self, methods->Get(i)); 2796 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2797 } 2798 2799 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2800 name->ToModifiedUtf8().c_str())); 2801 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2802 2803 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2804 name->ToModifiedUtf8().c_str())); 2805 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2806 2807 mirror::SynthesizedProxyClass* synth_proxy_class = 2808 down_cast<mirror::SynthesizedProxyClass*>(klass.get()); 2809 CHECK_EQ(synth_proxy_class->GetInterfaces(), interfaces); 2810 CHECK_EQ(synth_proxy_class->GetThrows(), throws); 2811 } 2812 std::string descriptor(GetDescriptorForProxy(klass.get())); 2813 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.get(), Hash(descriptor.c_str())); 2814 CHECK(existing == nullptr); 2815 return klass.get(); 2816} 2817 2818std::string ClassLinker::GetDescriptorForProxy(const mirror::Class* proxy_class) { 2819 DCHECK(proxy_class->IsProxyClass()); 2820 mirror::String* name = proxy_class->GetName(); 2821 DCHECK(name != NULL); 2822 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2823} 2824 2825mirror::ArtMethod* ClassLinker::FindMethodForProxy(const mirror::Class* proxy_class, 2826 const mirror::ArtMethod* proxy_method) { 2827 DCHECK(proxy_class->IsProxyClass()); 2828 DCHECK(proxy_method->IsProxyMethod()); 2829 // Locate the dex cache of the original interface/Object 2830 mirror::DexCache* dex_cache = NULL; 2831 { 2832 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2833 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2834 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2835 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2836 dex_cache = dex_caches_[i]; 2837 break; 2838 } 2839 } 2840 } 2841 CHECK(dex_cache != NULL); 2842 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2843 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2844 CHECK(resolved_method != NULL); 2845 return resolved_method; 2846} 2847 2848 2849mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2850 SirtRef<mirror::Class>& klass, 2851 mirror::Class* proxy_class) { 2852 // Create constructor for Proxy that must initialize h 2853 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2854 proxy_class->GetDirectMethods(); 2855 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2856 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2857 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2858 // code_ too) 2859 mirror::ArtMethod* constructor = 2860 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2861 if (constructor == NULL) { 2862 CHECK(self->IsExceptionPending()); // OOME. 2863 return NULL; 2864 } 2865 // Make this constructor public and fix the class to be our Proxy version 2866 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2867 constructor->SetDeclaringClass(klass.get()); 2868 return constructor; 2869} 2870 2871static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2872 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2873 CHECK(constructor->IsConstructor()); 2874 MethodHelper mh(constructor); 2875 CHECK_STREQ(mh.GetName(), "<init>"); 2876 CHECK_STREQ(mh.GetSignature().ToString().c_str(), "(Ljava/lang/reflect/InvocationHandler;)V"); 2877 DCHECK(constructor->IsPublic()); 2878} 2879 2880mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, SirtRef<mirror::Class>& klass, 2881 SirtRef<mirror::ArtMethod>& prototype) { 2882 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2883 // prototype method 2884 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2885 prototype.get()); 2886 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2887 // as necessary 2888 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 2889 if (UNLIKELY(method == NULL)) { 2890 CHECK(self->IsExceptionPending()); // OOME. 2891 return NULL; 2892 } 2893 2894 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 2895 // the intersection of throw exceptions as defined in Proxy 2896 method->SetDeclaringClass(klass.get()); 2897 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 2898 2899 // At runtime the method looks like a reference and argument saving method, clone the code 2900 // related parameters from this method. 2901 mirror::ArtMethod* refs_and_args = 2902 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 2903 method->SetCoreSpillMask(refs_and_args->GetCoreSpillMask()); 2904 method->SetFpSpillMask(refs_and_args->GetFpSpillMask()); 2905 method->SetFrameSizeInBytes(refs_and_args->GetFrameSizeInBytes()); 2906 method->SetEntryPointFromCompiledCode(GetProxyInvokeHandler()); 2907 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2908 2909 return method; 2910} 2911 2912static void CheckProxyMethod(mirror::ArtMethod* method, 2913 SirtRef<mirror::ArtMethod>& prototype) 2914 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2915 // Basic sanity 2916 CHECK(!prototype->IsFinal()); 2917 CHECK(method->IsFinal()); 2918 CHECK(!method->IsAbstract()); 2919 2920 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 2921 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 2922 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 2923 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 2924 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 2925 CHECK_EQ(prototype->GetDexCacheInitializedStaticStorage(), 2926 method->GetDexCacheInitializedStaticStorage()); 2927 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 2928 2929 MethodHelper mh(method); 2930 MethodHelper mh2(prototype.get()); 2931 CHECK_STREQ(mh.GetName(), mh2.GetName()); 2932 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 2933 // More complex sanity - via dex cache 2934 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 2935} 2936 2937static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 2938 bool can_init_parents) 2939 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2940 if (can_init_statics && can_init_statics) { 2941 return true; 2942 } 2943 if (!can_init_statics) { 2944 // Check if there's a class initializer. 2945 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 2946 if (clinit != NULL) { 2947 return false; 2948 } 2949 // Check if there are encoded static values needing initialization. 2950 if (klass->NumStaticFields() != 0) { 2951 ClassHelper kh(klass); 2952 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 2953 DCHECK(dex_class_def != NULL); 2954 if (dex_class_def->static_values_off_ != 0) { 2955 return false; 2956 } 2957 } 2958 } 2959 if (!klass->IsInterface() && klass->HasSuperClass()) { 2960 mirror::Class* super_class = klass->GetSuperClass(); 2961 if (!can_init_parents && !super_class->IsInitialized()) { 2962 return false; 2963 } else { 2964 if (!CanWeInitializeClass(super_class, can_init_statics, true)) { 2965 return false; 2966 } 2967 } 2968 } 2969 return true; 2970} 2971 2972bool ClassLinker::InitializeClass(mirror::Class* klass, bool can_init_statics, 2973 bool can_init_parents) { 2974 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 2975 2976 // Are we already initialized and therefore done? 2977 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 2978 // an initialized class will never change its state. 2979 if (klass->IsInitialized()) { 2980 return true; 2981 } 2982 2983 // Fast fail if initialization requires a full runtime. Not part of the JLS. 2984 if (!CanWeInitializeClass(klass, can_init_statics, can_init_parents)) { 2985 return false; 2986 } 2987 2988 Thread* self = Thread::Current(); 2989 uint64_t t0; 2990 { 2991 ObjectLock lock(self, klass); 2992 2993 // Re-check under the lock in case another thread initialized ahead of us. 2994 if (klass->IsInitialized()) { 2995 return true; 2996 } 2997 2998 // Was the class already found to be erroneous? Done under the lock to match the JLS. 2999 if (klass->IsErroneous()) { 3000 ThrowEarlierClassFailure(klass); 3001 return false; 3002 } 3003 3004 CHECK(klass->IsResolved()) << PrettyClass(klass) << ": state=" << klass->GetStatus(); 3005 3006 if (!klass->IsVerified()) { 3007 VerifyClass(klass); 3008 if (!klass->IsVerified()) { 3009 // We failed to verify, expect either the klass to be erroneous or verification failed at 3010 // compile time. 3011 if (klass->IsErroneous()) { 3012 CHECK(self->IsExceptionPending()); 3013 } else { 3014 CHECK(Runtime::Current()->IsCompiler()); 3015 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3016 } 3017 return false; 3018 } 3019 } 3020 3021 // If the class is kStatusInitializing, either this thread is 3022 // initializing higher up the stack or another thread has beat us 3023 // to initializing and we need to wait. Either way, this 3024 // invocation of InitializeClass will not be responsible for 3025 // running <clinit> and will return. 3026 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3027 // We caught somebody else in the act; was it us? 3028 if (klass->GetClinitThreadId() == self->GetTid()) { 3029 // Yes. That's fine. Return so we can continue initializing. 3030 return true; 3031 } 3032 // No. That's fine. Wait for another thread to finish initializing. 3033 return WaitForInitializeClass(klass, self, lock); 3034 } 3035 3036 if (!ValidateSuperClassDescriptors(klass)) { 3037 klass->SetStatus(mirror::Class::kStatusError, self); 3038 return false; 3039 } 3040 3041 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass); 3042 3043 // From here out other threads may observe that we're initializing and so changes of state 3044 // require the a notification. 3045 klass->SetClinitThreadId(self->GetTid()); 3046 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3047 3048 t0 = NanoTime(); 3049 } 3050 3051 // Initialize super classes, must be done while initializing for the JLS. 3052 if (!klass->IsInterface() && klass->HasSuperClass()) { 3053 mirror::Class* super_class = klass->GetSuperClass(); 3054 if (!super_class->IsInitialized()) { 3055 CHECK(!super_class->IsInterface()); 3056 CHECK(can_init_parents); 3057 bool super_initialized = InitializeClass(super_class, can_init_statics, true); 3058 if (!super_initialized) { 3059 // The super class was verified ahead of entering initializing, we should only be here if 3060 // the super class became erroneous due to initialization. 3061 CHECK(super_class->IsErroneous() && self->IsExceptionPending()) 3062 << "Super class initialization failed for " << PrettyDescriptor(super_class) 3063 << " that has unexpected status " << super_class->GetStatus() 3064 << "\nPending exception:\n" 3065 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3066 ObjectLock lock(self, klass); 3067 // Initialization failed because the super-class is erroneous. 3068 klass->SetStatus(mirror::Class::kStatusError, self); 3069 return false; 3070 } 3071 } 3072 } 3073 3074 if (klass->NumStaticFields() > 0) { 3075 ClassHelper kh(klass); 3076 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3077 CHECK(dex_class_def != NULL); 3078 const DexFile& dex_file = kh.GetDexFile(); 3079 EncodedStaticFieldValueIterator it(dex_file, kh.GetDexCache(), klass->GetClassLoader(), 3080 this, *dex_class_def); 3081 if (it.HasNext()) { 3082 CHECK(can_init_statics); 3083 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 3084 SafeMap<uint32_t, mirror::ArtField*> field_map; 3085 ConstructFieldMap(dex_file, *dex_class_def, klass, field_map); 3086 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3087 it.ReadValueToField(field_map.Get(i)); 3088 } 3089 } 3090 } 3091 3092 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3093 if (clinit != NULL) { 3094 CHECK(can_init_statics); 3095 if (LIKELY(Runtime::Current()->IsStarted())) { 3096 JValue result; 3097 clinit->Invoke(self, NULL, 0, &result, 'V'); 3098 } else { 3099 art::interpreter::EnterInterpreterFromInvoke(self, clinit, NULL, NULL, NULL); 3100 } 3101 } 3102 3103 // Opportunistically set static method trampolines to their destination. 3104 FixupStaticTrampolines(klass); 3105 3106 uint64_t t1 = NanoTime(); 3107 3108 bool success = true; 3109 { 3110 ObjectLock lock(self, klass); 3111 3112 if (self->IsExceptionPending()) { 3113 WrapExceptionInInitializer(); 3114 klass->SetStatus(mirror::Class::kStatusError, self); 3115 success = false; 3116 } else { 3117 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3118 RuntimeStats* thread_stats = self->GetStats(); 3119 ++global_stats->class_init_count; 3120 ++thread_stats->class_init_count; 3121 global_stats->class_init_time_ns += (t1 - t0); 3122 thread_stats->class_init_time_ns += (t1 - t0); 3123 // Set the class as initialized except if failed to initialize static fields. 3124 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3125 if (VLOG_IS_ON(class_linker)) { 3126 ClassHelper kh(klass); 3127 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 3128 } 3129 } 3130 } 3131 return success; 3132} 3133 3134bool ClassLinker::WaitForInitializeClass(mirror::Class* klass, Thread* self, ObjectLock& lock) 3135 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3136 while (true) { 3137 self->AssertNoPendingException(); 3138 CHECK(!klass->IsInitialized()); 3139 lock.WaitIgnoringInterrupts(); 3140 3141 // When we wake up, repeat the test for init-in-progress. If 3142 // there's an exception pending (only possible if 3143 // "interruptShouldThrow" was set), bail out. 3144 if (self->IsExceptionPending()) { 3145 WrapExceptionInInitializer(); 3146 klass->SetStatus(mirror::Class::kStatusError, self); 3147 return false; 3148 } 3149 // Spurious wakeup? Go back to waiting. 3150 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3151 continue; 3152 } 3153 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3154 // Compile time initialization failed. 3155 return false; 3156 } 3157 if (klass->IsErroneous()) { 3158 // The caller wants an exception, but it was thrown in a 3159 // different thread. Synthesize one here. 3160 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3161 PrettyDescriptor(klass).c_str()); 3162 return false; 3163 } 3164 if (klass->IsInitialized()) { 3165 return true; 3166 } 3167 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass) << " is " << klass->GetStatus(); 3168 } 3169 LOG(FATAL) << "Not Reached" << PrettyClass(klass); 3170} 3171 3172bool ClassLinker::ValidateSuperClassDescriptors(const mirror::Class* klass) { 3173 if (klass->IsInterface()) { 3174 return true; 3175 } 3176 // begin with the methods local to the superclass 3177 if (klass->HasSuperClass() && 3178 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3179 const mirror::Class* super = klass->GetSuperClass(); 3180 for (int i = super->GetVTable()->GetLength() - 1; i >= 0; --i) { 3181 const mirror::ArtMethod* method = klass->GetVTable()->Get(i); 3182 if (method != super->GetVTable()->Get(i) && 3183 !IsSameMethodSignatureInDifferentClassContexts(method, super, klass)) { 3184 ThrowLinkageError(klass, "Class %s method %s resolves differently in superclass %s", 3185 PrettyDescriptor(klass).c_str(), PrettyMethod(method).c_str(), 3186 PrettyDescriptor(super).c_str()); 3187 return false; 3188 } 3189 } 3190 } 3191 mirror::IfTable* iftable = klass->GetIfTable(); 3192 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3193 mirror::Class* interface = iftable->GetInterface(i); 3194 if (klass->GetClassLoader() != interface->GetClassLoader()) { 3195 for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { 3196 const mirror::ArtMethod* method = iftable->GetMethodArray(i)->Get(j); 3197 if (!IsSameMethodSignatureInDifferentClassContexts(method, interface, 3198 method->GetDeclaringClass())) { 3199 ThrowLinkageError(klass, "Class %s method %s resolves differently in interface %s", 3200 PrettyDescriptor(method->GetDeclaringClass()).c_str(), 3201 PrettyMethod(method).c_str(), 3202 PrettyDescriptor(interface).c_str()); 3203 return false; 3204 } 3205 } 3206 } 3207 } 3208 return true; 3209} 3210 3211// Returns true if classes referenced by the signature of the method are the 3212// same classes in klass1 as they are in klass2. 3213bool ClassLinker::IsSameMethodSignatureInDifferentClassContexts(const mirror::ArtMethod* method, 3214 const mirror::Class* klass1, 3215 const mirror::Class* klass2) { 3216 if (klass1 == klass2) { 3217 return true; 3218 } 3219 const DexFile& dex_file = *method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 3220 const DexFile::ProtoId& proto_id = 3221 dex_file.GetMethodPrototype(dex_file.GetMethodId(method->GetDexMethodIndex())); 3222 for (DexFileParameterIterator it(dex_file, proto_id); it.HasNext(); it.Next()) { 3223 const char* descriptor = it.GetDescriptor(); 3224 if (descriptor == NULL) { 3225 break; 3226 } 3227 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3228 // Found a non-primitive type. 3229 if (!IsSameDescriptorInDifferentClassContexts(descriptor, klass1, klass2)) { 3230 return false; 3231 } 3232 } 3233 } 3234 // Check the return type 3235 const char* descriptor = dex_file.GetReturnTypeDescriptor(proto_id); 3236 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3237 if (!IsSameDescriptorInDifferentClassContexts(descriptor, klass1, klass2)) { 3238 return false; 3239 } 3240 } 3241 return true; 3242} 3243 3244// Returns true if the descriptor resolves to the same class in the context of klass1 and klass2. 3245bool ClassLinker::IsSameDescriptorInDifferentClassContexts(const char* descriptor, 3246 const mirror::Class* klass1, 3247 const mirror::Class* klass2) { 3248 CHECK(descriptor != NULL); 3249 CHECK(klass1 != NULL); 3250 CHECK(klass2 != NULL); 3251 if (klass1 == klass2) { 3252 return true; 3253 } 3254 mirror::Class* found1 = FindClass(descriptor, klass1->GetClassLoader()); 3255 if (found1 == NULL) { 3256 Thread::Current()->ClearException(); 3257 } 3258 mirror::Class* found2 = FindClass(descriptor, klass2->GetClassLoader()); 3259 if (found2 == NULL) { 3260 Thread::Current()->ClearException(); 3261 } 3262 return found1 == found2; 3263} 3264 3265bool ClassLinker::EnsureInitialized(mirror::Class* c, bool can_init_fields, bool can_init_parents) { 3266 DCHECK(c != NULL); 3267 if (c->IsInitialized()) { 3268 return true; 3269 } 3270 3271 bool success = InitializeClass(c, can_init_fields, can_init_parents); 3272 if (!success) { 3273 Thread* self = Thread::Current(); 3274 CHECK(self->IsExceptionPending() || !can_init_fields || !can_init_parents) << PrettyClass(c); 3275 } 3276 return success; 3277} 3278 3279void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3280 mirror::Class* c, SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3281 mirror::ClassLoader* cl = c->GetClassLoader(); 3282 const byte* class_data = dex_file.GetClassData(dex_class_def); 3283 ClassDataItemIterator it(dex_file, class_data); 3284 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3285 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), c->GetDexCache(), cl, true)); 3286 } 3287} 3288 3289bool ClassLinker::LinkClass(SirtRef<mirror::Class>& klass, 3290 mirror::ObjectArray<mirror::Class>* interfaces, Thread* self) { 3291 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3292 if (!LinkSuperClass(klass)) { 3293 return false; 3294 } 3295 if (!LinkMethods(klass, interfaces)) { 3296 return false; 3297 } 3298 if (!LinkInstanceFields(klass)) { 3299 return false; 3300 } 3301 if (!LinkStaticFields(klass)) { 3302 return false; 3303 } 3304 CreateReferenceInstanceOffsets(klass); 3305 CreateReferenceStaticOffsets(klass); 3306 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3307 klass->SetStatus(mirror::Class::kStatusResolved, self); 3308 return true; 3309} 3310 3311bool ClassLinker::LoadSuperAndInterfaces(SirtRef<mirror::Class>& klass, const DexFile& dex_file) { 3312 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3313 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3314 uint16_t super_class_idx = class_def.superclass_idx_; 3315 if (super_class_idx != DexFile::kDexNoIndex16) { 3316 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.get()); 3317 if (super_class == NULL) { 3318 DCHECK(Thread::Current()->IsExceptionPending()); 3319 return false; 3320 } 3321 // Verify 3322 if (!klass->CanAccess(super_class)) { 3323 ThrowIllegalAccessError(klass.get(), "Class %s extended by class %s is inaccessible", 3324 PrettyDescriptor(super_class).c_str(), 3325 PrettyDescriptor(klass.get()).c_str()); 3326 return false; 3327 } 3328 klass->SetSuperClass(super_class); 3329 } 3330 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3331 if (interfaces != NULL) { 3332 for (size_t i = 0; i < interfaces->Size(); i++) { 3333 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3334 mirror::Class* interface = ResolveType(dex_file, idx, klass.get()); 3335 if (interface == NULL) { 3336 DCHECK(Thread::Current()->IsExceptionPending()); 3337 return false; 3338 } 3339 // Verify 3340 if (!klass->CanAccess(interface)) { 3341 // TODO: the RI seemed to ignore this in my testing. 3342 ThrowIllegalAccessError(klass.get(), "Interface %s implemented by class %s is inaccessible", 3343 PrettyDescriptor(interface).c_str(), 3344 PrettyDescriptor(klass.get()).c_str()); 3345 return false; 3346 } 3347 } 3348 } 3349 // Mark the class as loaded. 3350 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3351 return true; 3352} 3353 3354bool ClassLinker::LinkSuperClass(SirtRef<mirror::Class>& klass) { 3355 CHECK(!klass->IsPrimitive()); 3356 mirror::Class* super = klass->GetSuperClass(); 3357 if (klass.get() == GetClassRoot(kJavaLangObject)) { 3358 if (super != NULL) { 3359 ThrowClassFormatError(klass.get(), "java.lang.Object must not have a superclass"); 3360 return false; 3361 } 3362 return true; 3363 } 3364 if (super == NULL) { 3365 ThrowLinkageError(klass.get(), "No superclass defined for class %s", 3366 PrettyDescriptor(klass.get()).c_str()); 3367 return false; 3368 } 3369 // Verify 3370 if (super->IsFinal() || super->IsInterface()) { 3371 ThrowIncompatibleClassChangeError(klass.get(), "Superclass %s of %s is %s", 3372 PrettyDescriptor(super).c_str(), 3373 PrettyDescriptor(klass.get()).c_str(), 3374 super->IsFinal() ? "declared final" : "an interface"); 3375 return false; 3376 } 3377 if (!klass->CanAccess(super)) { 3378 ThrowIllegalAccessError(klass.get(), "Superclass %s is inaccessible to class %s", 3379 PrettyDescriptor(super).c_str(), 3380 PrettyDescriptor(klass.get()).c_str()); 3381 return false; 3382 } 3383 3384 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3385 if (super->IsFinalizable()) { 3386 klass->SetFinalizable(); 3387 } 3388 3389 // Inherit reference flags (if any) from the superclass. 3390 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3391 if (reference_flags != 0) { 3392 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3393 } 3394 // Disallow custom direct subclasses of java.lang.ref.Reference. 3395 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3396 ThrowLinkageError(klass.get(), 3397 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3398 PrettyDescriptor(klass.get()).c_str()); 3399 return false; 3400 } 3401 3402 if (kIsDebugBuild) { 3403 // Ensure super classes are fully resolved prior to resolving fields.. 3404 while (super != NULL) { 3405 CHECK(super->IsResolved()); 3406 super = super->GetSuperClass(); 3407 } 3408 } 3409 return true; 3410} 3411 3412// Populate the class vtable and itable. Compute return type indices. 3413bool ClassLinker::LinkMethods(SirtRef<mirror::Class>& klass, 3414 mirror::ObjectArray<mirror::Class>* interfaces) { 3415 if (klass->IsInterface()) { 3416 // No vtable. 3417 size_t count = klass->NumVirtualMethods(); 3418 if (!IsUint(16, count)) { 3419 ThrowClassFormatError(klass.get(), "Too many methods on interface: %zd", count); 3420 return false; 3421 } 3422 for (size_t i = 0; i < count; ++i) { 3423 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3424 } 3425 // Link interface method tables 3426 return LinkInterfaceMethods(klass, interfaces); 3427 } else { 3428 // Link virtual and interface method tables 3429 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3430 } 3431 return true; 3432} 3433 3434bool ClassLinker::LinkVirtualMethods(SirtRef<mirror::Class>& klass) { 3435 Thread* self = Thread::Current(); 3436 if (klass->HasSuperClass()) { 3437 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3438 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3439 CHECK_LE(actual_count, max_count); 3440 // TODO: do not assign to the vtable field until it is fully constructed. 3441 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3442 vtable(self, klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count)); 3443 if (UNLIKELY(vtable.get() == NULL)) { 3444 CHECK(self->IsExceptionPending()); // OOME. 3445 return false; 3446 } 3447 // See if any of our virtual methods override the superclass. 3448 MethodHelper local_mh(NULL, this); 3449 MethodHelper super_mh(NULL, this); 3450 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3451 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3452 local_mh.ChangeMethod(local_method); 3453 size_t j = 0; 3454 for (; j < actual_count; ++j) { 3455 mirror::ArtMethod* super_method = vtable->Get(j); 3456 super_mh.ChangeMethod(super_method); 3457 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3458 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3459 if (super_method->IsFinal()) { 3460 ThrowLinkageError(klass.get(), "Method %s overrides final method in class %s", 3461 PrettyMethod(local_method).c_str(), 3462 super_mh.GetDeclaringClassDescriptor()); 3463 return false; 3464 } 3465 vtable->Set(j, local_method); 3466 local_method->SetMethodIndex(j); 3467 break; 3468 } else { 3469 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3470 << " would have incorrectly overridden the package-private method in " 3471 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3472 } 3473 } 3474 } 3475 if (j == actual_count) { 3476 // Not overriding, append. 3477 vtable->Set(actual_count, local_method); 3478 local_method->SetMethodIndex(actual_count); 3479 actual_count += 1; 3480 } 3481 } 3482 if (!IsUint(16, actual_count)) { 3483 ThrowClassFormatError(klass.get(), "Too many methods defined on class: %zd", actual_count); 3484 return false; 3485 } 3486 // Shrink vtable if possible 3487 CHECK_LE(actual_count, max_count); 3488 if (actual_count < max_count) { 3489 vtable.reset(vtable->CopyOf(self, actual_count)); 3490 if (UNLIKELY(vtable.get() == NULL)) { 3491 CHECK(self->IsExceptionPending()); // OOME. 3492 return false; 3493 } 3494 } 3495 klass->SetVTable(vtable.get()); 3496 } else { 3497 CHECK(klass.get() == GetClassRoot(kJavaLangObject)); 3498 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3499 if (!IsUint(16, num_virtual_methods)) { 3500 ThrowClassFormatError(klass.get(), "Too many methods: %d", num_virtual_methods); 3501 return false; 3502 } 3503 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3504 vtable(self, AllocArtMethodArray(self, num_virtual_methods)); 3505 if (UNLIKELY(vtable.get() == NULL)) { 3506 CHECK(self->IsExceptionPending()); // OOME. 3507 return false; 3508 } 3509 for (size_t i = 0; i < num_virtual_methods; ++i) { 3510 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3511 vtable->Set(i, virtual_method); 3512 virtual_method->SetMethodIndex(i & 0xFFFF); 3513 } 3514 klass->SetVTable(vtable.get()); 3515 } 3516 return true; 3517} 3518 3519bool ClassLinker::LinkInterfaceMethods(SirtRef<mirror::Class>& klass, 3520 mirror::ObjectArray<mirror::Class>* interfaces) { 3521 size_t super_ifcount; 3522 if (klass->HasSuperClass()) { 3523 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3524 } else { 3525 super_ifcount = 0; 3526 } 3527 size_t ifcount = super_ifcount; 3528 ClassHelper kh(klass.get(), this); 3529 uint32_t num_interfaces = interfaces == NULL ? kh.NumDirectInterfaces() : interfaces->GetLength(); 3530 ifcount += num_interfaces; 3531 for (size_t i = 0; i < num_interfaces; i++) { 3532 mirror::Class* interface = interfaces == NULL ? kh.GetDirectInterface(i) : interfaces->Get(i); 3533 ifcount += interface->GetIfTableCount(); 3534 } 3535 if (ifcount == 0) { 3536 // Class implements no interfaces. 3537 DCHECK_EQ(klass->GetIfTableCount(), 0); 3538 DCHECK(klass->GetIfTable() == NULL); 3539 return true; 3540 } 3541 if (ifcount == super_ifcount) { 3542 // Class implements same interfaces as parent, are any of these not marker interfaces? 3543 bool has_non_marker_interface = false; 3544 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3545 for (size_t i = 0; i < ifcount; ++i) { 3546 if (super_iftable->GetMethodArrayCount(i) > 0) { 3547 has_non_marker_interface = true; 3548 break; 3549 } 3550 } 3551 if (!has_non_marker_interface) { 3552 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3553 klass->SetIfTable(super_iftable); 3554 return true; 3555 } 3556 } 3557 Thread* self = Thread::Current(); 3558 SirtRef<mirror::IfTable> iftable(self, AllocIfTable(self, ifcount)); 3559 if (UNLIKELY(iftable.get() == NULL)) { 3560 CHECK(self->IsExceptionPending()); // OOME. 3561 return false; 3562 } 3563 if (super_ifcount != 0) { 3564 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3565 for (size_t i = 0; i < super_ifcount; i++) { 3566 mirror::Class* super_interface = super_iftable->GetInterface(i); 3567 iftable->SetInterface(i, super_interface); 3568 } 3569 } 3570 // Flatten the interface inheritance hierarchy. 3571 size_t idx = super_ifcount; 3572 for (size_t i = 0; i < num_interfaces; i++) { 3573 mirror::Class* interface = interfaces == NULL ? kh.GetDirectInterface(i) : interfaces->Get(i); 3574 DCHECK(interface != NULL); 3575 if (!interface->IsInterface()) { 3576 ClassHelper ih(interface); 3577 ThrowIncompatibleClassChangeError(klass.get(), "Class %s implements non-interface class %s", 3578 PrettyDescriptor(klass.get()).c_str(), 3579 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3580 return false; 3581 } 3582 // Check if interface is already in iftable 3583 bool duplicate = false; 3584 for (size_t j = 0; j < idx; j++) { 3585 mirror::Class* existing_interface = iftable->GetInterface(j); 3586 if (existing_interface == interface) { 3587 duplicate = true; 3588 break; 3589 } 3590 } 3591 if (!duplicate) { 3592 // Add this non-duplicate interface. 3593 iftable->SetInterface(idx++, interface); 3594 // Add this interface's non-duplicate super-interfaces. 3595 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3596 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3597 bool super_duplicate = false; 3598 for (size_t k = 0; k < idx; k++) { 3599 mirror::Class* existing_interface = iftable->GetInterface(k); 3600 if (existing_interface == super_interface) { 3601 super_duplicate = true; 3602 break; 3603 } 3604 } 3605 if (!super_duplicate) { 3606 iftable->SetInterface(idx++, super_interface); 3607 } 3608 } 3609 } 3610 } 3611 // Shrink iftable in case duplicates were found 3612 if (idx < ifcount) { 3613 iftable.reset(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3614 if (UNLIKELY(iftable.get() == NULL)) { 3615 CHECK(self->IsExceptionPending()); // OOME. 3616 return false; 3617 } 3618 ifcount = idx; 3619 } else { 3620 CHECK_EQ(idx, ifcount); 3621 } 3622 klass->SetIfTable(iftable.get()); 3623 3624 // If we're an interface, we don't need the vtable pointers, so we're done. 3625 if (klass->IsInterface()) { 3626 return true; 3627 } 3628 std::vector<mirror::ArtMethod*> miranda_list; 3629 MethodHelper vtable_mh(NULL, this); 3630 MethodHelper interface_mh(NULL, this); 3631 for (size_t i = 0; i < ifcount; ++i) { 3632 mirror::Class* interface = iftable->GetInterface(i); 3633 size_t num_methods = interface->NumVirtualMethods(); 3634 if (num_methods > 0) { 3635 mirror::ObjectArray<mirror::ArtMethod>* method_array = 3636 AllocArtMethodArray(self, num_methods); 3637 if (UNLIKELY(method_array == NULL)) { 3638 CHECK(self->IsExceptionPending()); // OOME. 3639 return false; 3640 } 3641 iftable->SetMethodArray(i, method_array); 3642 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3643 for (size_t j = 0; j < num_methods; ++j) { 3644 mirror::ArtMethod* interface_method = interface->GetVirtualMethod(j); 3645 interface_mh.ChangeMethod(interface_method); 3646 int32_t k; 3647 // For each method listed in the interface's method list, find the 3648 // matching method in our class's method list. We want to favor the 3649 // subclass over the superclass, which just requires walking 3650 // back from the end of the vtable. (This only matters if the 3651 // superclass defines a private method and this class redefines 3652 // it -- otherwise it would use the same vtable slot. In .dex files 3653 // those don't end up in the virtual method table, so it shouldn't 3654 // matter which direction we go. We walk it backward anyway.) 3655 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3656 mirror::ArtMethod* vtable_method = vtable->Get(k); 3657 vtable_mh.ChangeMethod(vtable_method); 3658 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3659 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3660 ThrowIllegalAccessError(klass.get(), 3661 "Method '%s' implementing interface method '%s' is not public", 3662 PrettyMethod(vtable_method).c_str(), 3663 PrettyMethod(interface_method).c_str()); 3664 return false; 3665 } 3666 method_array->Set(j, vtable_method); 3667 break; 3668 } 3669 } 3670 if (k < 0) { 3671 SirtRef<mirror::ArtMethod> miranda_method(self, NULL); 3672 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3673 mirror::ArtMethod* mir_method = miranda_list[mir]; 3674 vtable_mh.ChangeMethod(mir_method); 3675 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3676 miranda_method.reset(miranda_list[mir]); 3677 break; 3678 } 3679 } 3680 if (miranda_method.get() == NULL) { 3681 // Point the interface table at a phantom slot. 3682 miranda_method.reset(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3683 if (UNLIKELY(miranda_method.get() == NULL)) { 3684 CHECK(self->IsExceptionPending()); // OOME. 3685 return false; 3686 } 3687#ifdef MOVING_GARBAGE_COLLECTOR 3688 // TODO: If a methods move then the miranda_list may hold stale references. 3689 UNIMPLEMENTED(FATAL); 3690#endif 3691 miranda_list.push_back(miranda_method.get()); 3692 } 3693 method_array->Set(j, miranda_method.get()); 3694 } 3695 } 3696 } 3697 } 3698 if (!miranda_list.empty()) { 3699 int old_method_count = klass->NumVirtualMethods(); 3700 int new_method_count = old_method_count + miranda_list.size(); 3701 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3702 if (old_method_count == 0) { 3703 virtuals = AllocArtMethodArray(self, new_method_count); 3704 } else { 3705 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3706 } 3707 if (UNLIKELY(virtuals == NULL)) { 3708 CHECK(self->IsExceptionPending()); // OOME. 3709 return false; 3710 } 3711 klass->SetVirtualMethods(virtuals); 3712 3713 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3714 vtable(self, klass->GetVTableDuringLinking()); 3715 CHECK(vtable.get() != NULL); 3716 int old_vtable_count = vtable->GetLength(); 3717 int new_vtable_count = old_vtable_count + miranda_list.size(); 3718 vtable.reset(vtable->CopyOf(self, new_vtable_count)); 3719 if (UNLIKELY(vtable.get() == NULL)) { 3720 CHECK(self->IsExceptionPending()); // OOME. 3721 return false; 3722 } 3723 for (size_t i = 0; i < miranda_list.size(); ++i) { 3724 mirror::ArtMethod* method = miranda_list[i]; 3725 // Leave the declaring class alone as type indices are relative to it 3726 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3727 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3728 klass->SetVirtualMethod(old_method_count + i, method); 3729 vtable->Set(old_vtable_count + i, method); 3730 } 3731 // TODO: do not assign to the vtable field until it is fully constructed. 3732 klass->SetVTable(vtable.get()); 3733 } 3734 3735 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3736 for (int i = 0; i < vtable->GetLength(); ++i) { 3737 CHECK(vtable->Get(i) != NULL); 3738 } 3739 3740// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3741 3742 return true; 3743} 3744 3745bool ClassLinker::LinkInstanceFields(SirtRef<mirror::Class>& klass) { 3746 CHECK(klass.get() != NULL); 3747 return LinkFields(klass, false); 3748} 3749 3750bool ClassLinker::LinkStaticFields(SirtRef<mirror::Class>& klass) { 3751 CHECK(klass.get() != NULL); 3752 size_t allocated_class_size = klass->GetClassSize(); 3753 bool success = LinkFields(klass, true); 3754 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3755 return success; 3756} 3757 3758struct LinkFieldsComparator { 3759 explicit LinkFieldsComparator(FieldHelper* fh) 3760 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 3761 : fh_(fh) {} 3762 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3763 bool operator()(const mirror::ArtField* field1, const mirror::ArtField* field2) 3764 NO_THREAD_SAFETY_ANALYSIS { 3765 // First come reference fields, then 64-bit, and finally 32-bit 3766 fh_->ChangeField(field1); 3767 Primitive::Type type1 = fh_->GetTypeAsPrimitiveType(); 3768 fh_->ChangeField(field2); 3769 Primitive::Type type2 = fh_->GetTypeAsPrimitiveType(); 3770 bool isPrimitive1 = type1 != Primitive::kPrimNot; 3771 bool isPrimitive2 = type2 != Primitive::kPrimNot; 3772 bool is64bit1 = isPrimitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3773 bool is64bit2 = isPrimitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3774 int order1 = (!isPrimitive1 ? 0 : (is64bit1 ? 1 : 2)); 3775 int order2 = (!isPrimitive2 ? 0 : (is64bit2 ? 1 : 2)); 3776 if (order1 != order2) { 3777 return order1 < order2; 3778 } 3779 3780 // same basic group? then sort by string. 3781 fh_->ChangeField(field1); 3782 const char* name1 = fh_->GetName(); 3783 fh_->ChangeField(field2); 3784 const char* name2 = fh_->GetName(); 3785 return strcmp(name1, name2) < 0; 3786 } 3787 3788 FieldHelper* fh_; 3789}; 3790 3791bool ClassLinker::LinkFields(SirtRef<mirror::Class>& klass, bool is_static) { 3792 size_t num_fields = 3793 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3794 3795 mirror::ObjectArray<mirror::ArtField>* fields = 3796 is_static ? klass->GetSFields() : klass->GetIFields(); 3797 3798 // Initialize size and field_offset 3799 size_t size; 3800 MemberOffset field_offset(0); 3801 if (is_static) { 3802 size = klass->GetClassSize(); 3803 field_offset = mirror::Class::FieldsOffset(); 3804 } else { 3805 mirror::Class* super_class = klass->GetSuperClass(); 3806 if (super_class != NULL) { 3807 CHECK(super_class->IsResolved()); 3808 field_offset = MemberOffset(super_class->GetObjectSize()); 3809 } 3810 size = field_offset.Uint32Value(); 3811 } 3812 3813 CHECK_EQ(num_fields == 0, fields == NULL); 3814 3815 // we want a relatively stable order so that adding new fields 3816 // minimizes disruption of C++ version such as Class and Method. 3817 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3818 for (size_t i = 0; i < num_fields; i++) { 3819 mirror::ArtField* f = fields->Get(i); 3820 CHECK(f != NULL); 3821 grouped_and_sorted_fields.push_back(f); 3822 } 3823 FieldHelper fh(NULL, this); 3824 std::sort(grouped_and_sorted_fields.begin(), 3825 grouped_and_sorted_fields.end(), 3826 LinkFieldsComparator(&fh)); 3827 3828 // References should be at the front. 3829 size_t current_field = 0; 3830 size_t num_reference_fields = 0; 3831 for (; current_field < num_fields; current_field++) { 3832 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3833 fh.ChangeField(field); 3834 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3835 bool isPrimitive = type != Primitive::kPrimNot; 3836 if (isPrimitive) { 3837 break; // past last reference, move on to the next phase 3838 } 3839 grouped_and_sorted_fields.pop_front(); 3840 num_reference_fields++; 3841 fields->Set(current_field, field); 3842 field->SetOffset(field_offset); 3843 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3844 } 3845 3846 // Now we want to pack all of the double-wide fields together. If 3847 // we're not aligned, though, we want to shuffle one 32-bit field 3848 // into place. If we can't find one, we'll have to pad it. 3849 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3850 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3851 mirror::ArtField* field = grouped_and_sorted_fields[i]; 3852 fh.ChangeField(field); 3853 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3854 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3855 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 3856 continue; 3857 } 3858 fields->Set(current_field++, field); 3859 field->SetOffset(field_offset); 3860 // drop the consumed field 3861 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 3862 break; 3863 } 3864 // whether we found a 32-bit field for padding or not, we advance 3865 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3866 } 3867 3868 // Alignment is good, shuffle any double-wide fields forward, and 3869 // finish assigning field offsets to all fields. 3870 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 3871 while (!grouped_and_sorted_fields.empty()) { 3872 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3873 grouped_and_sorted_fields.pop_front(); 3874 fh.ChangeField(field); 3875 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3876 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3877 fields->Set(current_field, field); 3878 field->SetOffset(field_offset); 3879 field_offset = MemberOffset(field_offset.Uint32Value() + 3880 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 3881 ? sizeof(uint64_t) 3882 : sizeof(uint32_t))); 3883 current_field++; 3884 } 3885 3886 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 3887 if (!is_static && 3888 (ClassHelper(klass.get(), this).GetDescriptorAsStringPiece() == "Ljava/lang/ref/Reference;")) { 3889 // We know there are no non-reference fields in the Reference classes, and we know 3890 // that 'referent' is alphabetically last, so this is easy... 3891 CHECK_EQ(num_reference_fields, num_fields); 3892 fh.ChangeField(fields->Get(num_fields - 1)); 3893 CHECK_STREQ(fh.GetName(), "referent"); 3894 --num_reference_fields; 3895 } 3896 3897 if (kIsDebugBuild) { 3898 // Make sure that all reference fields appear before 3899 // non-reference fields, and all double-wide fields are aligned. 3900 bool seen_non_ref = false; 3901 for (size_t i = 0; i < num_fields; i++) { 3902 mirror::ArtField* field = fields->Get(i); 3903 if (false) { // enable to debug field layout 3904 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 3905 << " class=" << PrettyClass(klass.get()) 3906 << " field=" << PrettyField(field) 3907 << " offset=" << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset()), 3908 false); 3909 } 3910 fh.ChangeField(field); 3911 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3912 bool is_primitive = type != Primitive::kPrimNot; 3913 if (ClassHelper(klass.get(), this).GetDescriptorAsStringPiece() == "Ljava/lang/ref/Reference;" && 3914 fh.GetNameAsStringPiece() == "referent") { 3915 is_primitive = true; // We lied above, so we have to expect a lie here. 3916 } 3917 if (is_primitive) { 3918 if (!seen_non_ref) { 3919 seen_non_ref = true; 3920 DCHECK_EQ(num_reference_fields, i); 3921 } 3922 } else { 3923 DCHECK(!seen_non_ref); 3924 } 3925 } 3926 if (!seen_non_ref) { 3927 DCHECK_EQ(num_fields, num_reference_fields); 3928 } 3929 } 3930 size = field_offset.Uint32Value(); 3931 // Update klass 3932 if (is_static) { 3933 klass->SetNumReferenceStaticFields(num_reference_fields); 3934 klass->SetClassSize(size); 3935 } else { 3936 klass->SetNumReferenceInstanceFields(num_reference_fields); 3937 if (!klass->IsVariableSize()) { 3938 DCHECK_GE(size, sizeof(mirror::Object)) << ClassHelper(klass.get(), this).GetDescriptor(); 3939 klass->SetObjectSize(size); 3940 } 3941 } 3942 return true; 3943} 3944 3945// Set the bitmap of reference offsets, refOffsets, from the ifields 3946// list. 3947void ClassLinker::CreateReferenceInstanceOffsets(SirtRef<mirror::Class>& klass) { 3948 uint32_t reference_offsets = 0; 3949 mirror::Class* super_class = klass->GetSuperClass(); 3950 if (super_class != NULL) { 3951 reference_offsets = super_class->GetReferenceInstanceOffsets(); 3952 // If our superclass overflowed, we don't stand a chance. 3953 if (reference_offsets == CLASS_WALK_SUPER) { 3954 klass->SetReferenceInstanceOffsets(reference_offsets); 3955 return; 3956 } 3957 } 3958 CreateReferenceOffsets(klass, false, reference_offsets); 3959} 3960 3961void ClassLinker::CreateReferenceStaticOffsets(SirtRef<mirror::Class>& klass) { 3962 CreateReferenceOffsets(klass, true, 0); 3963} 3964 3965void ClassLinker::CreateReferenceOffsets(SirtRef<mirror::Class>& klass, bool is_static, 3966 uint32_t reference_offsets) { 3967 size_t num_reference_fields = 3968 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 3969 : klass->NumReferenceInstanceFieldsDuringLinking(); 3970 const mirror::ObjectArray<mirror::ArtField>* fields = 3971 is_static ? klass->GetSFields() : klass->GetIFields(); 3972 // All of the fields that contain object references are guaranteed 3973 // to be at the beginning of the fields list. 3974 for (size_t i = 0; i < num_reference_fields; ++i) { 3975 // Note that byte_offset is the offset from the beginning of 3976 // object, not the offset into instance data 3977 const mirror::ArtField* field = fields->Get(i); 3978 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 3979 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 3980 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 3981 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 3982 CHECK_NE(new_bit, 0U); 3983 reference_offsets |= new_bit; 3984 } else { 3985 reference_offsets = CLASS_WALK_SUPER; 3986 break; 3987 } 3988 } 3989 // Update fields in klass 3990 if (is_static) { 3991 klass->SetReferenceStaticOffsets(reference_offsets); 3992 } else { 3993 klass->SetReferenceInstanceOffsets(reference_offsets); 3994 } 3995} 3996 3997mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, 3998 uint32_t string_idx, mirror::DexCache* dex_cache) { 3999 DCHECK(dex_cache != NULL); 4000 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4001 if (resolved != NULL) { 4002 return resolved; 4003 } 4004 const DexFile::StringId& string_id = dex_file.GetStringId(string_idx); 4005 int32_t utf16_length = dex_file.GetStringLength(string_id); 4006 const char* utf8_data = dex_file.GetStringData(string_id); 4007 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4008 dex_cache->SetResolvedString(string_idx, string); 4009 return string; 4010} 4011 4012mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, 4013 uint16_t type_idx, 4014 mirror::DexCache* dex_cache, 4015 mirror::ClassLoader* class_loader) { 4016 DCHECK(dex_cache != NULL); 4017 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4018 if (resolved == NULL) { 4019 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4020 resolved = FindClass(descriptor, class_loader); 4021 if (resolved != NULL) { 4022 // TODO: we used to throw here if resolved's class loader was not the 4023 // boot class loader. This was to permit different classes with the 4024 // same name to be loaded simultaneously by different loaders 4025 dex_cache->SetResolvedType(type_idx, resolved); 4026 } else { 4027 Thread* self = Thread::Current(); 4028 CHECK(self->IsExceptionPending()) 4029 << "Expected pending exception for failed resolution of: " << descriptor; 4030 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4031 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 4032 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4033 Thread::Current()->ClearException(); 4034 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4035 self->GetException(NULL)->SetCause(cause.get()); 4036 } 4037 } 4038 } 4039 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4040 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4041 return resolved; 4042} 4043 4044mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 4045 uint32_t method_idx, 4046 mirror::DexCache* dex_cache, 4047 mirror::ClassLoader* class_loader, 4048 const mirror::ArtMethod* referrer, 4049 InvokeType type) { 4050 DCHECK(dex_cache != NULL); 4051 // Check for hit in the dex cache. 4052 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4053 if (resolved != NULL && !resolved->IsRuntimeMethod()) { 4054 return resolved; 4055 } 4056 // Fail, get the declaring class. 4057 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4058 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4059 if (klass == NULL) { 4060 DCHECK(Thread::Current()->IsExceptionPending()); 4061 return NULL; 4062 } 4063 // Scan using method_idx, this saves string compares but will only hit for matching dex 4064 // caches/files. 4065 switch (type) { 4066 case kDirect: // Fall-through. 4067 case kStatic: 4068 resolved = klass->FindDirectMethod(dex_cache, method_idx); 4069 break; 4070 case kInterface: 4071 resolved = klass->FindInterfaceMethod(dex_cache, method_idx); 4072 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4073 break; 4074 case kSuper: // Fall-through. 4075 case kVirtual: 4076 resolved = klass->FindVirtualMethod(dex_cache, method_idx); 4077 break; 4078 default: 4079 LOG(FATAL) << "Unreachable - invocation type: " << type; 4080 } 4081 if (resolved == NULL) { 4082 // Search by name, which works across dex files. 4083 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4084 const Signature signature = dex_file.GetMethodSignature(method_id); 4085 switch (type) { 4086 case kDirect: // Fall-through. 4087 case kStatic: 4088 resolved = klass->FindDirectMethod(name, signature); 4089 break; 4090 case kInterface: 4091 resolved = klass->FindInterfaceMethod(name, signature); 4092 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4093 break; 4094 case kSuper: // Fall-through. 4095 case kVirtual: 4096 resolved = klass->FindVirtualMethod(name, signature); 4097 break; 4098 } 4099 } 4100 if (resolved != NULL) { 4101 // We found a method, check for incompatible class changes. 4102 if (resolved->CheckIncompatibleClassChange(type)) { 4103 resolved = NULL; 4104 } 4105 } 4106 if (resolved != NULL) { 4107 // Be a good citizen and update the dex cache to speed subsequent calls. 4108 dex_cache->SetResolvedMethod(method_idx, resolved); 4109 return resolved; 4110 } else { 4111 // We failed to find the method which means either an access error, an incompatible class 4112 // change, or no such method. First try to find the method among direct and virtual methods. 4113 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4114 const Signature signature = dex_file.GetMethodSignature(method_id); 4115 switch (type) { 4116 case kDirect: 4117 case kStatic: 4118 resolved = klass->FindVirtualMethod(name, signature); 4119 break; 4120 case kInterface: 4121 case kVirtual: 4122 case kSuper: 4123 resolved = klass->FindDirectMethod(name, signature); 4124 break; 4125 } 4126 4127 // If we found something, check that it can be accessed by the referrer. 4128 if (resolved != NULL && referrer != NULL) { 4129 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4130 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4131 if (!referring_class->CanAccess(methods_class)) { 4132 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4133 referrer, resolved, type); 4134 return NULL; 4135 } else if (!referring_class->CanAccessMember(methods_class, 4136 resolved->GetAccessFlags())) { 4137 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4138 return NULL; 4139 } 4140 } 4141 4142 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4143 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4144 switch (type) { 4145 case kDirect: 4146 case kStatic: 4147 if (resolved != NULL) { 4148 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4149 } else { 4150 resolved = klass->FindInterfaceMethod(name, signature); 4151 if (resolved != NULL) { 4152 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4153 } else { 4154 ThrowNoSuchMethodError(type, klass, name, signature); 4155 } 4156 } 4157 break; 4158 case kInterface: 4159 if (resolved != NULL) { 4160 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4161 } else { 4162 resolved = klass->FindVirtualMethod(name, signature); 4163 if (resolved != NULL) { 4164 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4165 } else { 4166 ThrowNoSuchMethodError(type, klass, name, signature); 4167 } 4168 } 4169 break; 4170 case kSuper: 4171 ThrowNoSuchMethodError(type, klass, name, signature); 4172 break; 4173 case kVirtual: 4174 if (resolved != NULL) { 4175 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4176 } else { 4177 resolved = klass->FindInterfaceMethod(name, signature); 4178 if (resolved != NULL) { 4179 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4180 } else { 4181 ThrowNoSuchMethodError(type, klass, name, signature); 4182 } 4183 } 4184 break; 4185 } 4186 DCHECK(Thread::Current()->IsExceptionPending()); 4187 return NULL; 4188 } 4189} 4190 4191mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, 4192 uint32_t field_idx, 4193 mirror::DexCache* dex_cache, 4194 mirror::ClassLoader* class_loader, 4195 bool is_static) { 4196 DCHECK(dex_cache != NULL); 4197 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4198 if (resolved != NULL) { 4199 return resolved; 4200 } 4201 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4202 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4203 if (klass == NULL) { 4204 DCHECK(Thread::Current()->IsExceptionPending()); 4205 return NULL; 4206 } 4207 4208 if (is_static) { 4209 resolved = klass->FindStaticField(dex_cache, field_idx); 4210 } else { 4211 resolved = klass->FindInstanceField(dex_cache, field_idx); 4212 } 4213 4214 if (resolved == NULL) { 4215 const char* name = dex_file.GetFieldName(field_id); 4216 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4217 if (is_static) { 4218 resolved = klass->FindStaticField(name, type); 4219 } else { 4220 resolved = klass->FindInstanceField(name, type); 4221 } 4222 if (resolved == NULL) { 4223 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 4224 return NULL; 4225 } 4226 } 4227 dex_cache->SetResolvedField(field_idx, resolved); 4228 return resolved; 4229} 4230 4231mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4232 uint32_t field_idx, 4233 mirror::DexCache* dex_cache, 4234 mirror::ClassLoader* class_loader) { 4235 DCHECK(dex_cache != NULL); 4236 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4237 if (resolved != NULL) { 4238 return resolved; 4239 } 4240 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4241 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4242 if (klass == NULL) { 4243 DCHECK(Thread::Current()->IsExceptionPending()); 4244 return NULL; 4245 } 4246 4247 StringPiece name(dex_file.StringDataAsStringPieceByIdx(field_id.name_idx_)); 4248 StringPiece type(dex_file.StringDataAsStringPieceByIdx( 4249 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4250 resolved = klass->FindField(name, type); 4251 if (resolved != NULL) { 4252 dex_cache->SetResolvedField(field_idx, resolved); 4253 } else { 4254 ThrowNoSuchFieldError("", klass, type, name); 4255 } 4256 return resolved; 4257} 4258 4259const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4260 uint32_t* length) { 4261 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4262 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4263 const DexFile& dex_file = *dex_cache->GetDexFile(); 4264 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4265 return dex_file.GetMethodShorty(method_id, length); 4266} 4267 4268void ClassLinker::DumpAllClasses(int flags) { 4269 if (dex_cache_image_class_lookup_required_) { 4270 MoveImageClassesToClassTable(); 4271 } 4272 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4273 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4274 std::vector<mirror::Class*> all_classes; 4275 { 4276 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4277 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 4278 all_classes.push_back(it.second); 4279 } 4280 } 4281 4282 for (size_t i = 0; i < all_classes.size(); ++i) { 4283 all_classes[i]->DumpClass(std::cerr, flags); 4284 } 4285} 4286 4287void ClassLinker::DumpForSigQuit(std::ostream& os) { 4288 if (dex_cache_image_class_lookup_required_) { 4289 MoveImageClassesToClassTable(); 4290 } 4291 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4292 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4293} 4294 4295size_t ClassLinker::NumLoadedClasses() { 4296 if (dex_cache_image_class_lookup_required_) { 4297 MoveImageClassesToClassTable(); 4298 } 4299 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4300 return class_table_.size(); 4301} 4302 4303pid_t ClassLinker::GetClassesLockOwner() { 4304 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4305} 4306 4307pid_t ClassLinker::GetDexLockOwner() { 4308 return dex_lock_.GetExclusiveOwnerTid(); 4309} 4310 4311void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4312 DCHECK(!init_done_); 4313 4314 DCHECK(klass != NULL); 4315 DCHECK(klass->GetClassLoader() == NULL); 4316 4317 DCHECK(class_roots_ != NULL); 4318 DCHECK(class_roots_->Get(class_root) == NULL); 4319 class_roots_->Set(class_root, klass); 4320} 4321 4322} // namespace art 4323