class_linker.cc revision 756ee4e090bc1e1812b41fb7b4661df601a32ef9
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 std::string& dex_filename, 544 int oat_fd, 545 const std::string& oat_cache_filename) { 546 std::string dex2oat_string(GetAndroidRoot()); 547 dex2oat_string += (kIsDebugBuild ? "/bin/dex2oatd" : "/bin/dex2oat"); 548 const char* dex2oat = dex2oat_string.c_str(); 549 550 const char* class_path = Runtime::Current()->GetClassPathString().c_str(); 551 552 gc::Heap* heap = Runtime::Current()->GetHeap(); 553 std::string boot_image_option_string("--boot-image="); 554 boot_image_option_string += heap->GetImageSpace()->GetImageFilename(); 555 const char* boot_image_option = boot_image_option_string.c_str(); 556 557 std::string dex_file_option_string("--dex-file="); 558 dex_file_option_string += dex_filename; 559 const char* dex_file_option = dex_file_option_string.c_str(); 560 561 std::string oat_fd_option_string("--oat-fd="); 562 StringAppendF(&oat_fd_option_string, "%d", oat_fd); 563 const char* oat_fd_option = oat_fd_option_string.c_str(); 564 565 std::string oat_location_option_string("--oat-location="); 566 oat_location_option_string += oat_cache_filename; 567 const char* oat_location_option = oat_location_option_string.c_str(); 568 569 std::string oat_compiler_filter_string("-compiler-filter:"); 570 switch (Runtime::Current()->GetCompilerFilter()) { 571 case Runtime::kInterpretOnly: 572 oat_compiler_filter_string += "interpret-only"; 573 break; 574 case Runtime::kSpace: 575 oat_compiler_filter_string += "space"; 576 break; 577 case Runtime::kBalanced: 578 oat_compiler_filter_string += "balanced"; 579 break; 580 case Runtime::kSpeed: 581 oat_compiler_filter_string += "speed"; 582 break; 583 case Runtime::kEverything: 584 oat_compiler_filter_string += "everything"; 585 break; 586 default: 587 LOG(FATAL) << "Unexpected case."; 588 } 589 const char* oat_compiler_filter_option = oat_compiler_filter_string.c_str(); 590 591 // fork and exec dex2oat 592 pid_t pid = fork(); 593 if (pid == 0) { 594 // no allocation allowed between fork and exec 595 596 // change process groups, so we don't get reaped by ProcessManager 597 setpgid(0, 0); 598 599 // gLogVerbosity.class_linker = true; 600 VLOG(class_linker) << dex2oat 601 << " --runtime-arg -Xms64m" 602 << " --runtime-arg -Xmx64m" 603 << " --runtime-arg -classpath" 604 << " --runtime-arg " << class_path 605 << " --runtime-arg " << oat_compiler_filter_option 606#if !defined(ART_TARGET) 607 << " --host" 608#endif 609 << " " << boot_image_option 610 << " " << dex_file_option 611 << " " << oat_fd_option 612 << " " << oat_location_option; 613 614 execl(dex2oat, dex2oat, 615 "--runtime-arg", "-Xms64m", 616 "--runtime-arg", "-Xmx64m", 617 "--runtime-arg", "-classpath", 618 "--runtime-arg", class_path, 619 "--runtime-arg", oat_compiler_filter_option, 620#if !defined(ART_TARGET) 621 "--host", 622#endif 623 boot_image_option, 624 dex_file_option, 625 oat_fd_option, 626 oat_location_option, 627 NULL); 628 629 PLOG(FATAL) << "execl(" << dex2oat << ") failed"; 630 return false; 631 } else { 632 // wait for dex2oat to finish 633 int status; 634 pid_t got_pid = TEMP_FAILURE_RETRY(waitpid(pid, &status, 0)); 635 if (got_pid != pid) { 636 PLOG(ERROR) << "waitpid failed: wanted " << pid << ", got " << got_pid; 637 return false; 638 } 639 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { 640 LOG(ERROR) << dex2oat << " failed with dex-file=" << dex_filename; 641 return false; 642 } 643 } 644 return true; 645} 646 647void ClassLinker::RegisterOatFile(const OatFile& oat_file) { 648 WriterMutexLock mu(Thread::Current(), dex_lock_); 649 RegisterOatFileLocked(oat_file); 650} 651 652void ClassLinker::RegisterOatFileLocked(const OatFile& oat_file) { 653 dex_lock_.AssertExclusiveHeld(Thread::Current()); 654 if (kIsDebugBuild) { 655 for (size_t i = 0; i < oat_files_.size(); ++i) { 656 CHECK_NE(&oat_file, oat_files_[i]) << oat_file.GetLocation(); 657 } 658 } 659 VLOG(class_linker) << "Registering " << oat_file.GetLocation(); 660 oat_files_.push_back(&oat_file); 661} 662 663OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 664 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 665 OatFile& oat_file = space->ReleaseOatFile(); 666 WriterMutexLock mu(Thread::Current(), dex_lock_); 667 RegisterOatFileLocked(oat_file); 668 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 669 return oat_file; 670} 671 672const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 673 ReaderMutexLock mu(Thread::Current(), dex_lock_); 674 return FindOpenedOatFileFromDexLocation(dex_file.GetLocation(), dex_file.GetLocationChecksum()); 675} 676 677const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation(const std::string& dex_location, 678 uint32_t dex_location_checksum) { 679 for (size_t i = 0; i < oat_files_.size(); i++) { 680 const OatFile* oat_file = oat_files_[i]; 681 DCHECK(oat_file != NULL); 682 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 683 &dex_location_checksum, 684 false); 685 if (oat_dex_file != NULL) { 686 return oat_file; 687 } 688 } 689 return NULL; 690} 691 692const DexFile* ClassLinker::FindDexFileInOatLocation(const std::string& dex_location, 693 uint32_t dex_location_checksum, 694 const std::string& oat_location) { 695 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 696 !Runtime::Current()->IsCompiler())); 697 if (oat_file.get() == NULL) { 698 VLOG(class_linker) << "Failed to find existing oat file at " << oat_location; 699 return NULL; 700 } 701 Runtime* runtime = Runtime::Current(); 702 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 703 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 704 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 705 if (expected_image_oat_checksum != actual_image_oat_checksum) { 706 VLOG(class_linker) << "Failed to find oat file at " << oat_location 707 << " with expected image oat checksum of " << expected_image_oat_checksum 708 << ", found " << actual_image_oat_checksum; 709 return NULL; 710 } 711 712 uint32_t expected_image_oat_offset = reinterpret_cast<uint32_t>(image_header.GetOatDataBegin()); 713 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 714 if (expected_image_oat_offset != actual_image_oat_offset) { 715 VLOG(class_linker) << "Failed to find oat file at " << oat_location 716 << " with expected image oat offset " << expected_image_oat_offset 717 << ", found " << actual_image_oat_offset; 718 return NULL; 719 } 720 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 721 if (oat_dex_file == NULL) { 722 VLOG(class_linker) << "Failed to find oat file at " << oat_location << " containing " << dex_location; 723 return NULL; 724 } 725 uint32_t expected_dex_checksum = dex_location_checksum; 726 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 727 if (expected_dex_checksum != actual_dex_checksum) { 728 VLOG(class_linker) << "Failed to find oat file at " << oat_location 729 << " with expected dex checksum of " << expected_dex_checksum 730 << ", found " << actual_dex_checksum; 731 return NULL; 732 } 733 RegisterOatFileLocked(*oat_file.release()); 734 return oat_dex_file->OpenDexFile(); 735} 736 737const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation(const std::string& dex_location, 738 uint32_t dex_location_checksum, 739 const std::string& oat_location) { 740 WriterMutexLock mu(Thread::Current(), dex_lock_); 741 return FindOrCreateOatFileForDexLocationLocked(dex_location, dex_location_checksum, oat_location); 742} 743 744class ScopedFlock { 745 public: 746 ScopedFlock() {} 747 748 bool Init(const std::string& filename) { 749 while (true) { 750 file_.reset(OS::OpenFileWithFlags(filename.c_str(), O_CREAT | O_RDWR)); 751 if (file_.get() == NULL) { 752 LOG(ERROR) << "Failed to open file: " << filename; 753 return false; 754 } 755 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_EX)); 756 if (flock_result != 0) { 757 PLOG(ERROR) << "Failed to lock file: " << filename; 758 return false; 759 } 760 struct stat fstat_stat; 761 int fstat_result = TEMP_FAILURE_RETRY(fstat(file_->Fd(), &fstat_stat)); 762 if (fstat_result != 0) { 763 PLOG(ERROR) << "Failed to fstat: " << filename; 764 return false; 765 } 766 struct stat stat_stat; 767 int stat_result = TEMP_FAILURE_RETRY(stat(filename.c_str(), &stat_stat)); 768 if (stat_result != 0) { 769 PLOG(WARNING) << "Failed to stat, will retry: " << filename; 770 // ENOENT can happen if someone racing with us unlinks the file we created so just retry. 771 continue; 772 } 773 if (fstat_stat.st_dev != stat_stat.st_dev || fstat_stat.st_ino != stat_stat.st_ino) { 774 LOG(WARNING) << "File changed while locking, will retry: " << filename; 775 continue; 776 } 777 return true; 778 } 779 } 780 781 File& GetFile() { 782 return *file_; 783 } 784 785 ~ScopedFlock() { 786 if (file_.get() != NULL) { 787 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_UN)); 788 CHECK_EQ(0, flock_result); 789 } 790 } 791 792 private: 793 UniquePtr<File> file_; 794 795 DISALLOW_COPY_AND_ASSIGN(ScopedFlock); 796}; 797 798const DexFile* ClassLinker::FindOrCreateOatFileForDexLocationLocked(const std::string& dex_location, 799 uint32_t dex_location_checksum, 800 const std::string& oat_location) { 801 // We play a locking game here so that if two different processes 802 // race to generate (or worse, one tries to open a partial generated 803 // file) we will be okay. This is actually common with apps that use 804 // DexClassLoader to work around the dex method reference limit and 805 // that have a background service running in a separate process. 806 ScopedFlock scoped_flock; 807 if (!scoped_flock.Init(oat_location)) { 808 LOG(ERROR) << "Failed to open locked oat file: " << oat_location; 809 return NULL; 810 } 811 812 // Check if we already have an up-to-date output file 813 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, 814 dex_location_checksum, 815 oat_location); 816 if (dex_file != NULL) { 817 return dex_file; 818 } 819 820 // Generate the output oat file for the dex file 821 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 822 if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location)) { 823 LOG(ERROR) << "Failed to generate oat file: " << oat_location; 824 return NULL; 825 } 826 const OatFile* oat_file = OatFile::Open(oat_location, oat_location, NULL, 827 !Runtime::Current()->IsCompiler()); 828 if (oat_file == NULL) { 829 LOG(ERROR) << "Failed to open generated oat file: " << oat_location; 830 return NULL; 831 } 832 RegisterOatFileLocked(*oat_file); 833 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 834 if (oat_dex_file == NULL) { 835 LOG(ERROR) << "Failed to find dex file " << dex_location 836 << " (checksum " << dex_location_checksum 837 << ") in generated oat file: " << oat_location; 838 return NULL; 839 } 840 const DexFile* result = oat_dex_file->OpenDexFile(); 841 CHECK_EQ(dex_location_checksum, result->GetLocationChecksum()) 842 << "dex_location=" << dex_location << " oat_location=" << oat_location << std::hex 843 << " dex_location_checksum=" << dex_location_checksum 844 << " DexFile::GetLocationChecksum()=" << result->GetLocationChecksum(); 845 return result; 846} 847 848bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 849 const std::string& dex_location, 850 uint32_t dex_location_checksum) { 851 Runtime* runtime = Runtime::Current(); 852 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 853 uint32_t image_oat_checksum = image_header.GetOatChecksum(); 854 uint32_t image_oat_data_begin = reinterpret_cast<uint32_t>(image_header.GetOatDataBegin()); 855 bool image_check = ((oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum) 856 && (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 857 858 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 859 if (oat_dex_file == NULL) { 860 LOG(ERROR) << "oat file " << oat_file->GetLocation() 861 << " does not contain contents for " << dex_location 862 << " with checksum " << dex_location_checksum; 863 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 864 for (size_t i = 0; i < oat_dex_files.size(); i++) { 865 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 866 LOG(ERROR) << "oat file " << oat_file->GetLocation() 867 << " contains contents for " << oat_dex_file->GetDexFileLocation(); 868 } 869 return false; 870 } 871 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 872 873 if (image_check && dex_check) { 874 return true; 875 } 876 877 if (!image_check) { 878 std::string image_file(image_header.GetImageRoot( 879 ImageHeader::kOatLocation)->AsString()->ToModifiedUtf8()); 880 LOG(WARNING) << "oat file " << oat_file->GetLocation() 881 << " mismatch (" << std::hex << oat_file->GetOatHeader().GetImageFileLocationOatChecksum() 882 << ", " << oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() 883 << ") with " << image_file 884 << " (" << image_oat_checksum << ", " << std::hex << image_oat_data_begin << ")"; 885 } 886 if (!dex_check) { 887 LOG(WARNING) << "oat file " << oat_file->GetLocation() 888 << " mismatch (" << std::hex << oat_dex_file->GetDexFileLocationChecksum() 889 << ") with " << dex_location 890 << " (" << std::hex << dex_location_checksum << ")"; 891 } 892 return false; 893} 894 895const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const OatFile* oat_file, 896 const std::string& dex_location, 897 uint32_t dex_location_checksum) { 898 bool verified = VerifyOatFileChecksums(oat_file, dex_location, dex_location_checksum); 899 if (!verified) { 900 delete oat_file; 901 return NULL; 902 } 903 RegisterOatFileLocked(*oat_file); 904 return oat_file->GetOatDexFile(dex_location, &dex_location_checksum)->OpenDexFile(); 905} 906 907const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const std::string& dex_location, 908 uint32_t dex_location_checksum) { 909 WriterMutexLock mu(Thread::Current(), dex_lock_); 910 911 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location, 912 dex_location_checksum); 913 if (open_oat_file != NULL) { 914 return open_oat_file->GetOatDexFile(dex_location, &dex_location_checksum)->OpenDexFile(); 915 } 916 917 // Look for an existing file next to dex. for example, for 918 // /foo/bar/baz.jar, look for /foo/bar/baz.odex. 919 std::string odex_filename(OatFile::DexFilenameToOdexFilename(dex_location)); 920 UniquePtr<const OatFile> oat_file(FindOatFileFromOatLocationLocked(odex_filename)); 921 if (oat_file.get() != NULL) { 922 uint32_t dex_location_checksum; 923 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum)) { 924 // If no classes.dex found in dex_location, it has been stripped, assume oat is up-to-date. 925 // This is the common case in user builds for jar's and apk's in the /system directory. 926 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 927 CHECK(oat_dex_file != NULL) << odex_filename << " " << dex_location; 928 RegisterOatFileLocked(*oat_file); 929 return oat_dex_file->OpenDexFile(); 930 } 931 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(oat_file.release(), 932 dex_location, 933 dex_location_checksum); 934 if (dex_file != NULL) { 935 return dex_file; 936 } 937 } 938 // Look for an existing file in the dalvik-cache, validating the result if found 939 // not found in /foo/bar/baz.odex? try /data/dalvik-cache/foo@bar@baz.jar@classes.dex 940 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location)); 941 oat_file.reset(FindOatFileFromOatLocationLocked(cache_location)); 942 if (oat_file.get() != NULL) { 943 uint32_t dex_location_checksum; 944 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum)) { 945 LOG(WARNING) << "Failed to compute checksum: " << dex_location; 946 return NULL; 947 } 948 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(oat_file.release(), 949 dex_location, 950 dex_location_checksum); 951 if (dex_file != NULL) { 952 return dex_file; 953 } 954 if (TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 955 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 956 } 957 } 958 LOG(INFO) << "Failed to open oat file from " << odex_filename << " or " << cache_location << "."; 959 960 // Try to generate oat file if it wasn't found or was obsolete. 961 std::string oat_cache_filename(GetDalvikCacheFilenameOrDie(dex_location)); 962 return FindOrCreateOatFileForDexLocationLocked(dex_location, dex_location_checksum, oat_cache_filename); 963} 964 965const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 966 for (size_t i = 0; i < oat_files_.size(); i++) { 967 const OatFile* oat_file = oat_files_[i]; 968 DCHECK(oat_file != NULL); 969 if (oat_file->GetLocation() == oat_location) { 970 return oat_file; 971 } 972 } 973 return NULL; 974} 975 976const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location) { 977 ReaderMutexLock mu(Thread::Current(), dex_lock_); 978 return FindOatFileFromOatLocationLocked(oat_location); 979} 980 981const OatFile* ClassLinker::FindOatFileFromOatLocationLocked(const std::string& oat_location) { 982 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 983 if (oat_file != NULL) { 984 return oat_file; 985 } 986 987 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler()); 988 if (oat_file == NULL) { 989 return NULL; 990 } 991 return oat_file; 992} 993 994static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 995 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 996 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 997 998 DCHECK(obj != NULL); 999 DCHECK(class_linker != NULL); 1000 1001 if (obj->IsArtMethod()) { 1002 mirror::ArtMethod* method = obj->AsArtMethod(); 1003 if (!method->IsNative()) { 1004 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1005 if (method != Runtime::Current()->GetResolutionMethod()) { 1006 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1007 } 1008 } 1009 } 1010} 1011 1012void ClassLinker::InitFromImage() { 1013 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1014 CHECK(!init_done_); 1015 1016 gc::Heap* heap = Runtime::Current()->GetHeap(); 1017 gc::space::ImageSpace* space = heap->GetImageSpace(); 1018 dex_cache_image_class_lookup_required_ = true; 1019 CHECK(space != NULL); 1020 OatFile& oat_file = GetImageOatFile(space); 1021 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1022 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1023 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 1024 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1025 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1026 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1027 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1028 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1029 1030 mirror::ObjectArray<mirror::Class>* class_roots = 1031 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>(); 1032 class_roots_ = class_roots; 1033 1034 // Special case of setting up the String class early so that we can test arbitrary objects 1035 // as being Strings or not 1036 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1037 1038 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1039 static_cast<uint32_t>(dex_caches->GetLength())); 1040 Thread* self = Thread::Current(); 1041 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1042 SirtRef<mirror::DexCache> dex_cache(self, dex_caches->Get(i)); 1043 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1044 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location, NULL); 1045 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1046 const DexFile* dex_file = oat_dex_file->OpenDexFile(); 1047 if (dex_file == NULL) { 1048 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1049 << " from within oat file " << oat_file.GetLocation(); 1050 } 1051 1052 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1053 1054 AppendToBootClassPath(*dex_file, dex_cache); 1055 } 1056 1057 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1058 // bitmap walk. 1059 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1060 1061 // Set entry point to interpreter if in InterpretOnly mode. 1062 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1063 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1064 heap->FlushAllocStack(); 1065 heap->GetLiveBitmap()->Walk(InitFromImageInterpretOnlyCallback, this); 1066 } 1067 1068 // reinit class_roots_ 1069 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1070 class_roots_ = class_roots; 1071 1072 // reinit array_iftable_ from any array class instance, they should be == 1073 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1074 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1075 // String class root was set above 1076 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1077 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1078 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1079 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1080 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1081 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1082 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1083 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1084 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1085 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1086 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1087 1088 FinishInit(); 1089 1090 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1091} 1092 1093// Keep in sync with InitCallback. Anything we visit, we need to 1094// reinit references to when reinitializing a ClassLinker from a 1095// mapped image. 1096void ClassLinker::VisitRoots(RootVisitor* visitor, void* arg, bool only_dirty, bool clean_dirty) { 1097 visitor(class_roots_, arg); 1098 Thread* self = Thread::Current(); 1099 { 1100 ReaderMutexLock mu(self, dex_lock_); 1101 if (!only_dirty || dex_caches_dirty_) { 1102 for (mirror::DexCache* dex_cache : dex_caches_) { 1103 visitor(dex_cache, arg); 1104 } 1105 if (clean_dirty) { 1106 dex_caches_dirty_ = false; 1107 } 1108 } 1109 } 1110 1111 { 1112 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 1113 if (!only_dirty || class_table_dirty_) { 1114 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 1115 visitor(it.second, arg); 1116 } 1117 if (clean_dirty) { 1118 class_table_dirty_ = false; 1119 } 1120 } 1121 1122 // We deliberately ignore the class roots in the image since we 1123 // handle image roots by using the MS/CMS rescanning of dirty cards. 1124 } 1125 1126 visitor(array_iftable_, arg); 1127} 1128 1129void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1130 if (dex_cache_image_class_lookup_required_) { 1131 MoveImageClassesToClassTable(); 1132 } 1133 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1134 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 1135 if (!visitor(it.second, arg)) { 1136 return; 1137 } 1138 } 1139} 1140 1141static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1142 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1143 classes->insert(c); 1144 return true; 1145} 1146 1147void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1148 std::set<mirror::Class*> classes; 1149 VisitClasses(GetClassesVisitor, &classes); 1150 for (mirror::Class* klass : classes) { 1151 if (!visitor(klass, arg)) { 1152 return; 1153 } 1154 } 1155} 1156 1157 1158ClassLinker::~ClassLinker() { 1159 mirror::Class::ResetClass(); 1160 mirror::String::ResetClass(); 1161 mirror::ArtField::ResetClass(); 1162 mirror::ArtMethod::ResetClass(); 1163 mirror::BooleanArray::ResetArrayClass(); 1164 mirror::ByteArray::ResetArrayClass(); 1165 mirror::CharArray::ResetArrayClass(); 1166 mirror::DoubleArray::ResetArrayClass(); 1167 mirror::FloatArray::ResetArrayClass(); 1168 mirror::IntArray::ResetArrayClass(); 1169 mirror::LongArray::ResetArrayClass(); 1170 mirror::ShortArray::ResetArrayClass(); 1171 mirror::Throwable::ResetClass(); 1172 mirror::StackTraceElement::ResetClass(); 1173 STLDeleteElements(&boot_class_path_); 1174 STLDeleteElements(&oat_files_); 1175} 1176 1177mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1178 gc::Heap* heap = Runtime::Current()->GetHeap(); 1179 mirror::Class* dex_cache_class = GetClassRoot(kJavaLangDexCache); 1180 SirtRef<mirror::DexCache> dex_cache(self, 1181 down_cast<mirror::DexCache*>(heap->AllocObject(self, dex_cache_class, 1182 dex_cache_class->GetObjectSize()))); 1183 if (dex_cache.get() == NULL) { 1184 return NULL; 1185 } 1186 SirtRef<mirror::String> 1187 location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str())); 1188 if (location.get() == NULL) { 1189 return NULL; 1190 } 1191 SirtRef<mirror::ObjectArray<mirror::String> > 1192 strings(self, AllocStringArray(self, dex_file.NumStringIds())); 1193 if (strings.get() == NULL) { 1194 return NULL; 1195 } 1196 SirtRef<mirror::ObjectArray<mirror::Class> > 1197 types(self, AllocClassArray(self, dex_file.NumTypeIds())); 1198 if (types.get() == NULL) { 1199 return NULL; 1200 } 1201 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 1202 methods(self, AllocArtMethodArray(self, dex_file.NumMethodIds())); 1203 if (methods.get() == NULL) { 1204 return NULL; 1205 } 1206 SirtRef<mirror::ObjectArray<mirror::ArtField> > 1207 fields(self, AllocArtFieldArray(self, dex_file.NumFieldIds())); 1208 if (fields.get() == NULL) { 1209 return NULL; 1210 } 1211 SirtRef<mirror::ObjectArray<mirror::StaticStorageBase> > 1212 initialized_static_storage(self, 1213 AllocObjectArray<mirror::StaticStorageBase>(self, dex_file.NumTypeIds())); 1214 if (initialized_static_storage.get() == NULL) { 1215 return NULL; 1216 } 1217 1218 dex_cache->Init(&dex_file, 1219 location.get(), 1220 strings.get(), 1221 types.get(), 1222 methods.get(), 1223 fields.get(), 1224 initialized_static_storage.get()); 1225 return dex_cache.get(); 1226} 1227 1228mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1229 size_t class_size) { 1230 DCHECK_GE(class_size, sizeof(mirror::Class)); 1231 gc::Heap* heap = Runtime::Current()->GetHeap(); 1232 mirror::Object* k = heap->AllocObject(self, java_lang_Class, class_size); 1233 if (UNLIKELY(k == NULL)) { 1234 CHECK(self->IsExceptionPending()); // OOME. 1235 return NULL; 1236 } 1237 mirror::Class* klass = k->AsClass(); 1238 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1239 klass->SetClassSize(class_size); 1240 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1241 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1242 return klass; 1243} 1244 1245mirror::Class* ClassLinker::AllocClass(Thread* self, size_t class_size) { 1246 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1247} 1248 1249mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1250 return down_cast<mirror::ArtField*>(GetClassRoot(kJavaLangReflectArtField)->AllocObject(self)); 1251} 1252 1253mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1254 return down_cast<mirror::ArtMethod*>(GetClassRoot(kJavaLangReflectArtMethod)->AllocObject(self)); 1255} 1256 1257mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray(Thread* self, 1258 size_t length) { 1259 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc(self, 1260 GetClassRoot(kJavaLangStackTraceElementArrayClass), 1261 length); 1262} 1263 1264static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1265 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1266 DCHECK(klass != NULL); 1267 // Wait for the class if it has not already been linked. 1268 if (!klass->IsResolved() && !klass->IsErroneous()) { 1269 ObjectLock lock(self, klass); 1270 // Check for circular dependencies between classes. 1271 if (!klass->IsResolved() && klass->GetClinitThreadId() == self->GetTid()) { 1272 ThrowClassCircularityError(klass); 1273 klass->SetStatus(mirror::Class::kStatusError, self); 1274 return NULL; 1275 } 1276 // Wait for the pending initialization to complete. 1277 while (!klass->IsResolved() && !klass->IsErroneous()) { 1278 lock.WaitIgnoringInterrupts(); 1279 } 1280 } 1281 if (klass->IsErroneous()) { 1282 ThrowEarlierClassFailure(klass); 1283 return NULL; 1284 } 1285 // Return the loaded class. No exceptions should be pending. 1286 CHECK(klass->IsResolved()) << PrettyClass(klass); 1287 self->AssertNoPendingException(); 1288 return klass; 1289} 1290 1291bool ClassLinker::IsInBootClassPath(const char* descriptor) { 1292 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1293 return pair.second != NULL; 1294} 1295 1296mirror::Class* ClassLinker::FindSystemClass(const char* descriptor) { 1297 return FindClass(descriptor, NULL); 1298} 1299 1300mirror::Class* ClassLinker::FindClass(const char* descriptor, mirror::ClassLoader* class_loader) { 1301 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1302 Thread* self = Thread::Current(); 1303 DCHECK(self != NULL); 1304 self->AssertNoPendingException(); 1305 if (descriptor[1] == '\0') { 1306 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1307 // for primitive classes that aren't backed by dex files. 1308 return FindPrimitiveClass(descriptor[0]); 1309 } 1310 // Find the class in the loaded classes table. 1311 mirror::Class* klass = LookupClass(descriptor, class_loader); 1312 if (klass != NULL) { 1313 return EnsureResolved(self, klass); 1314 } 1315 // Class is not yet loaded. 1316 if (descriptor[0] == '[') { 1317 return CreateArrayClass(descriptor, class_loader); 1318 1319 } else if (class_loader == NULL) { 1320 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1321 if (pair.second != NULL) { 1322 return DefineClass(descriptor, NULL, *pair.first, *pair.second); 1323 } 1324 1325 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1326 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1327 // throw of a NoClassDefFoundError. 1328 if (IsInBootClassPath(descriptor)) { 1329 mirror::Class* system_class = FindSystemClass(descriptor); 1330 CHECK(system_class != NULL); 1331 return system_class; 1332 } 1333 // Next try the compile time class path. 1334 const std::vector<const DexFile*>* class_path; 1335 { 1336 ScopedObjectAccessUnchecked soa(self); 1337 ScopedLocalRef<jobject> jclass_loader(soa.Env(), soa.AddLocalReference<jobject>(class_loader)); 1338 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1339 } 1340 1341 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1342 if (pair.second != NULL) { 1343 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1344 } 1345 1346 } else { 1347 ScopedObjectAccessUnchecked soa(self->GetJniEnv()); 1348 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1349 soa.AddLocalReference<jobject>(class_loader)); 1350 std::string class_name_string(DescriptorToDot(descriptor)); 1351 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1352 { 1353 ScopedThreadStateChange tsc(self, kNative); 1354 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1355 soa.Env()->NewStringUTF(class_name_string.c_str())); 1356 if (class_name_object.get() == NULL) { 1357 return NULL; 1358 } 1359 CHECK(class_loader_object.get() != NULL); 1360 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1361 WellKnownClasses::java_lang_ClassLoader_loadClass, 1362 class_name_object.get())); 1363 } 1364 if (soa.Self()->IsExceptionPending()) { 1365 // If the ClassLoader threw, pass that exception up. 1366 return NULL; 1367 } else if (result.get() == NULL) { 1368 // broken loader - throw NPE to be compatible with Dalvik 1369 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1370 class_name_string.c_str()).c_str()); 1371 return NULL; 1372 } else { 1373 // success, return mirror::Class* 1374 return soa.Decode<mirror::Class*>(result.get()); 1375 } 1376 } 1377 1378 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1379 return NULL; 1380} 1381 1382mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1383 mirror::ClassLoader* class_loader, 1384 const DexFile& dex_file, 1385 const DexFile::ClassDef& dex_class_def) { 1386 Thread* self = Thread::Current(); 1387 SirtRef<mirror::Class> klass(self, NULL); 1388 // Load the class from the dex file. 1389 if (UNLIKELY(!init_done_)) { 1390 // finish up init of hand crafted class_roots_ 1391 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1392 klass.reset(GetClassRoot(kJavaLangObject)); 1393 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1394 klass.reset(GetClassRoot(kJavaLangClass)); 1395 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1396 klass.reset(GetClassRoot(kJavaLangString)); 1397 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1398 klass.reset(GetClassRoot(kJavaLangDexCache)); 1399 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1400 klass.reset(GetClassRoot(kJavaLangReflectArtField)); 1401 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1402 klass.reset(GetClassRoot(kJavaLangReflectArtMethod)); 1403 } else { 1404 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1405 } 1406 } else { 1407 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1408 } 1409 if (UNLIKELY(klass.get() == NULL)) { 1410 CHECK(self->IsExceptionPending()); // Expect an OOME. 1411 return NULL; 1412 } 1413 klass->SetDexCache(FindDexCache(dex_file)); 1414 LoadClass(dex_file, dex_class_def, klass, class_loader); 1415 // Check for a pending exception during load 1416 if (self->IsExceptionPending()) { 1417 klass->SetStatus(mirror::Class::kStatusError, self); 1418 return NULL; 1419 } 1420 ObjectLock lock(self, klass.get()); 1421 klass->SetClinitThreadId(self->GetTid()); 1422 { 1423 // Add the newly loaded class to the loaded classes table. 1424 mirror::Class* existing = InsertClass(descriptor, klass.get(), Hash(descriptor)); 1425 if (existing != NULL) { 1426 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1427 // this thread to block. 1428 return EnsureResolved(self, existing); 1429 } 1430 } 1431 // Finish loading (if necessary) by finding parents 1432 CHECK(!klass->IsLoaded()); 1433 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1434 // Loading failed. 1435 klass->SetStatus(mirror::Class::kStatusError, self); 1436 return NULL; 1437 } 1438 CHECK(klass->IsLoaded()); 1439 // Link the class (if necessary) 1440 CHECK(!klass->IsResolved()); 1441 if (!LinkClass(klass, NULL, self)) { 1442 // Linking failed. 1443 klass->SetStatus(mirror::Class::kStatusError, self); 1444 return NULL; 1445 } 1446 CHECK(klass->IsResolved()); 1447 1448 /* 1449 * We send CLASS_PREPARE events to the debugger from here. The 1450 * definition of "preparation" is creating the static fields for a 1451 * class and initializing them to the standard default values, but not 1452 * executing any code (that comes later, during "initialization"). 1453 * 1454 * We did the static preparation in LinkClass. 1455 * 1456 * The class has been prepared and resolved but possibly not yet verified 1457 * at this point. 1458 */ 1459 Dbg::PostClassPrepare(klass.get()); 1460 1461 return klass.get(); 1462} 1463 1464// Precomputes size that will be needed for Class, matching LinkStaticFields 1465size_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1466 const DexFile::ClassDef& dex_class_def) { 1467 const byte* class_data = dex_file.GetClassData(dex_class_def); 1468 size_t num_ref = 0; 1469 size_t num_32 = 0; 1470 size_t num_64 = 0; 1471 if (class_data != NULL) { 1472 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1473 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1474 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1475 char c = descriptor[0]; 1476 if (c == 'L' || c == '[') { 1477 num_ref++; 1478 } else if (c == 'J' || c == 'D') { 1479 num_64++; 1480 } else { 1481 num_32++; 1482 } 1483 } 1484 } 1485 // start with generic class data 1486 size_t size = sizeof(mirror::Class); 1487 // follow with reference fields which must be contiguous at start 1488 size += (num_ref * sizeof(uint32_t)); 1489 // if there are 64-bit fields to add, make sure they are aligned 1490 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1491 if (num_32 != 0) { 1492 // use an available 32-bit field for padding 1493 num_32--; 1494 } 1495 size += sizeof(uint32_t); // either way, we are adding a word 1496 DCHECK_EQ(size, RoundUp(size, 8)); 1497 } 1498 // tack on any 64-bit fields now that alignment is assured 1499 size += (num_64 * sizeof(uint64_t)); 1500 // tack on any remaining 32-bit fields 1501 size += (num_32 * sizeof(uint32_t)); 1502 return size; 1503} 1504 1505const OatFile::OatClass* ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1506 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1507 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1508 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1509 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1510 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation(), 1511 &dex_location_checksum); 1512 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1513 const OatFile::OatClass* oat_class = oat_dex_file->GetOatClass(class_def_idx); 1514 CHECK(oat_class != NULL) << dex_file.GetLocation() << " " << class_def_idx; 1515 return oat_class; 1516} 1517 1518static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1519 uint32_t method_idx) { 1520 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1521 const byte* class_data = dex_file.GetClassData(class_def); 1522 CHECK(class_data != NULL); 1523 ClassDataItemIterator it(dex_file, class_data); 1524 // Skip fields 1525 while (it.HasNextStaticField()) { 1526 it.Next(); 1527 } 1528 while (it.HasNextInstanceField()) { 1529 it.Next(); 1530 } 1531 // Process methods 1532 size_t class_def_method_index = 0; 1533 while (it.HasNextDirectMethod()) { 1534 if (it.GetMemberIndex() == method_idx) { 1535 return class_def_method_index; 1536 } 1537 class_def_method_index++; 1538 it.Next(); 1539 } 1540 while (it.HasNextVirtualMethod()) { 1541 if (it.GetMemberIndex() == method_idx) { 1542 return class_def_method_index; 1543 } 1544 class_def_method_index++; 1545 it.Next(); 1546 } 1547 DCHECK(!it.HasNext()); 1548 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1549 return 0; 1550} 1551 1552const OatFile::OatMethod ClassLinker::GetOatMethodFor(const mirror::ArtMethod* method) { 1553 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1554 // method for direct methods (or virtual methods made direct). 1555 mirror::Class* declaring_class = method->GetDeclaringClass(); 1556 size_t oat_method_index; 1557 if (method->IsStatic() || method->IsDirect()) { 1558 // Simple case where the oat method index was stashed at load time. 1559 oat_method_index = method->GetMethodIndex(); 1560 } else { 1561 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1562 // by search for its position in the declared virtual methods. 1563 oat_method_index = declaring_class->NumDirectMethods(); 1564 size_t end = declaring_class->NumVirtualMethods(); 1565 bool found = false; 1566 for (size_t i = 0; i < end; i++) { 1567 if (declaring_class->GetVirtualMethod(i) == method) { 1568 found = true; 1569 break; 1570 } 1571 oat_method_index++; 1572 } 1573 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1574 } 1575 UniquePtr<const OatFile::OatClass> 1576 oat_class(GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1577 declaring_class->GetDexClassDefIndex())); 1578 CHECK(oat_class.get() != NULL); 1579 DCHECK_EQ(oat_method_index, 1580 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1581 method->GetDeclaringClass()->GetDexClassDefIndex(), 1582 method->GetDexMethodIndex())); 1583 1584 return oat_class->GetOatMethod(oat_method_index); 1585} 1586 1587// Special case to get oat code without overwriting a trampoline. 1588const void* ClassLinker::GetOatCodeFor(const mirror::ArtMethod* method) { 1589 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1590 if (method->IsProxyMethod()) { 1591#if !defined(ART_USE_PORTABLE_COMPILER) 1592 return reinterpret_cast<void*>(art_quick_proxy_invoke_handler); 1593#else 1594 return reinterpret_cast<void*>(art_portable_proxy_invoke_handler); 1595#endif 1596 } 1597 const void* result = GetOatMethodFor(method).GetCode(); 1598 if (result == NULL) { 1599 // No code? You must mean to go into the interpreter. 1600 result = GetCompiledCodeToInterpreterBridge(); 1601 } 1602 return result; 1603} 1604 1605const void* ClassLinker::GetOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1606 uint32_t method_idx) { 1607 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1608 CHECK(oat_class.get() != nullptr); 1609 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1610 return oat_class->GetOatMethod(oat_method_idx).GetCode(); 1611} 1612 1613// Returns true if the method must run with interpreter, false otherwise. 1614static bool NeedsInterpreter(const mirror::ArtMethod* method, const void* code) { 1615 if (code == NULL) { 1616 // No code: need interpreter. 1617 return true; 1618 } 1619#ifdef ART_SEA_IR_MODE 1620 ScopedObjectAccess soa(Thread::Current()); 1621 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1622 LOG(INFO) << "Found " << PrettyMethod(method); 1623 return false; 1624 } 1625#endif 1626 // If interpreter mode is enabled, every method (except native and proxy) must 1627 // be run with interpreter. 1628 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1629 !method->IsNative() && !method->IsProxyMethod(); 1630} 1631 1632void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1633 ClassHelper kh(klass); 1634 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 1635 CHECK(dex_class_def != NULL); 1636 const DexFile& dex_file = kh.GetDexFile(); 1637 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1638 if (class_data == NULL) { 1639 return; // no fields or methods - for example a marker interface 1640 } 1641 Runtime* runtime = Runtime::Current(); 1642 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1643 // OAT file unavailable 1644 return; 1645 } 1646 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1647 CHECK(oat_class.get() != NULL); 1648 ClassDataItemIterator it(dex_file, class_data); 1649 // Skip fields 1650 while (it.HasNextStaticField()) { 1651 it.Next(); 1652 } 1653 while (it.HasNextInstanceField()) { 1654 it.Next(); 1655 } 1656 // Link the code of methods skipped by LinkCode 1657 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1658 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1659 if (!method->IsStatic()) { 1660 // Only update static methods. 1661 continue; 1662 } 1663 const void* code = oat_class->GetOatMethod(method_index).GetCode(); 1664 const bool enter_interpreter = NeedsInterpreter(method, code); 1665 if (enter_interpreter) { 1666 // Use interpreter entry point. 1667 code = GetCompiledCodeToInterpreterBridge(); 1668 } 1669 runtime->GetInstrumentation()->UpdateMethodsCode(method, code); 1670 } 1671 // Ignore virtual methods on the iterator. 1672} 1673 1674static void LinkCode(SirtRef<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class, 1675 uint32_t method_index) 1676 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1677 // Method shouldn't have already been linked. 1678 DCHECK(method->GetEntryPointFromCompiledCode() == NULL); 1679 // Every kind of method should at least get an invoke stub from the oat_method. 1680 // non-abstract methods also get their code pointers. 1681 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1682 oat_method.LinkMethod(method.get()); 1683 1684 // Install entry point from interpreter. 1685 Runtime* runtime = Runtime::Current(); 1686 bool enter_interpreter = NeedsInterpreter(method.get(), method->GetEntryPointFromCompiledCode()); 1687 if (enter_interpreter) { 1688 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1689 } else { 1690 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1691 } 1692 1693 if (method->IsAbstract()) { 1694 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1695 return; 1696 } 1697 1698 if (method->IsStatic() && !method->IsConstructor()) { 1699 // For static methods excluding the class initializer, install the trampoline. 1700 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1701 // after initializing class (see ClassLinker::InitializeClass method). 1702 method->SetEntryPointFromCompiledCode(GetResolutionTrampoline(runtime->GetClassLinker())); 1703 } else if (enter_interpreter) { 1704 // Set entry point from compiled code if there's no code or in interpreter only mode. 1705 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1706 } 1707 1708 if (method->IsNative()) { 1709 // Unregistering restores the dlsym lookup stub. 1710 method->UnregisterNative(Thread::Current()); 1711 } 1712 1713 // Allow instrumentation its chance to hijack code. 1714 runtime->GetInstrumentation()->UpdateMethodsCode(method.get(), 1715 method->GetEntryPointFromCompiledCode()); 1716} 1717 1718void ClassLinker::LoadClass(const DexFile& dex_file, 1719 const DexFile::ClassDef& dex_class_def, 1720 SirtRef<mirror::Class>& klass, 1721 mirror::ClassLoader* class_loader) { 1722 CHECK(klass.get() != NULL); 1723 CHECK(klass->GetDexCache() != NULL); 1724 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1725 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1726 CHECK(descriptor != NULL); 1727 1728 klass->SetClass(GetClassRoot(kJavaLangClass)); 1729 uint32_t access_flags = dex_class_def.access_flags_; 1730 // Make sure that none of our runtime-only flags are set. 1731 // TODO: JACK CLASS ACCESS (HACK TO BE REMOVED) 1732 CHECK_EQ(access_flags & ~(kAccJavaFlagsMask | kAccClassJack), 0U); 1733 klass->SetAccessFlags(access_flags); 1734 klass->SetClassLoader(class_loader); 1735 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1736 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1737 1738 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1739 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1740 1741 // Load fields fields. 1742 const byte* class_data = dex_file.GetClassData(dex_class_def); 1743 if (class_data == NULL) { 1744 return; // no fields or methods - for example a marker interface 1745 } 1746 ClassDataItemIterator it(dex_file, class_data); 1747 Thread* self = Thread::Current(); 1748 if (it.NumStaticFields() != 0) { 1749 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1750 if (UNLIKELY(statics == NULL)) { 1751 CHECK(self->IsExceptionPending()); // OOME. 1752 return; 1753 } 1754 klass->SetSFields(statics); 1755 } 1756 if (it.NumInstanceFields() != 0) { 1757 mirror::ObjectArray<mirror::ArtField>* fields = 1758 AllocArtFieldArray(self, it.NumInstanceFields()); 1759 if (UNLIKELY(fields == NULL)) { 1760 CHECK(self->IsExceptionPending()); // OOME. 1761 return; 1762 } 1763 klass->SetIFields(fields); 1764 } 1765 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1766 SirtRef<mirror::ArtField> sfield(self, AllocArtField(self)); 1767 if (UNLIKELY(sfield.get() == NULL)) { 1768 CHECK(self->IsExceptionPending()); // OOME. 1769 return; 1770 } 1771 klass->SetStaticField(i, sfield.get()); 1772 LoadField(dex_file, it, klass, sfield); 1773 } 1774 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1775 SirtRef<mirror::ArtField> ifield(self, AllocArtField(self)); 1776 if (UNLIKELY(ifield.get() == NULL)) { 1777 CHECK(self->IsExceptionPending()); // OOME. 1778 return; 1779 } 1780 klass->SetInstanceField(i, ifield.get()); 1781 LoadField(dex_file, it, klass, ifield); 1782 } 1783 1784 UniquePtr<const OatFile::OatClass> oat_class; 1785 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1786 oat_class.reset(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1787 } 1788 1789 // Load methods. 1790 if (it.NumDirectMethods() != 0) { 1791 // TODO: append direct methods to class object 1792 mirror::ObjectArray<mirror::ArtMethod>* directs = 1793 AllocArtMethodArray(self, it.NumDirectMethods()); 1794 if (UNLIKELY(directs == NULL)) { 1795 CHECK(self->IsExceptionPending()); // OOME. 1796 return; 1797 } 1798 klass->SetDirectMethods(directs); 1799 } 1800 if (it.NumVirtualMethods() != 0) { 1801 // TODO: append direct methods to class object 1802 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1803 AllocArtMethodArray(self, it.NumVirtualMethods()); 1804 if (UNLIKELY(virtuals == NULL)) { 1805 CHECK(self->IsExceptionPending()); // OOME. 1806 return; 1807 } 1808 klass->SetVirtualMethods(virtuals); 1809 } 1810 size_t class_def_method_index = 0; 1811 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1812 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1813 if (UNLIKELY(method.get() == NULL)) { 1814 CHECK(self->IsExceptionPending()); // OOME. 1815 return; 1816 } 1817 klass->SetDirectMethod(i, method.get()); 1818 if (oat_class.get() != NULL) { 1819 LinkCode(method, oat_class.get(), class_def_method_index); 1820 } 1821 method->SetMethodIndex(class_def_method_index); 1822 class_def_method_index++; 1823 } 1824 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1825 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1826 if (UNLIKELY(method.get() == NULL)) { 1827 CHECK(self->IsExceptionPending()); // OOME. 1828 return; 1829 } 1830 klass->SetVirtualMethod(i, method.get()); 1831 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1832 if (oat_class.get() != NULL) { 1833 LinkCode(method, oat_class.get(), class_def_method_index); 1834 } 1835 class_def_method_index++; 1836 } 1837 DCHECK(!it.HasNext()); 1838} 1839 1840void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1841 SirtRef<mirror::Class>& klass, SirtRef<mirror::ArtField>& dst) { 1842 uint32_t field_idx = it.GetMemberIndex(); 1843 dst->SetDexFieldIndex(field_idx); 1844 dst->SetDeclaringClass(klass.get()); 1845 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1846} 1847 1848mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1849 const ClassDataItemIterator& it, 1850 SirtRef<mirror::Class>& klass) { 1851 uint32_t dex_method_idx = it.GetMemberIndex(); 1852 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1853 StringPiece method_name(dex_file.GetMethodName(method_id)); 1854 1855 mirror::ArtMethod* dst = AllocArtMethod(self); 1856 if (UNLIKELY(dst == NULL)) { 1857 CHECK(self->IsExceptionPending()); // OOME. 1858 return NULL; 1859 } 1860 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 1861 1862 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 1863 dst->SetDexMethodIndex(dex_method_idx); 1864 dst->SetDeclaringClass(klass.get()); 1865 1866 if (method_name == "finalize") { 1867 // Create the prototype for a signature of "()V" 1868 const DexFile::StringId* void_string_id = dex_file.FindStringId("V"); 1869 if (void_string_id != NULL) { 1870 const DexFile::TypeId* void_type_id = 1871 dex_file.FindTypeId(dex_file.GetIndexForStringId(*void_string_id)); 1872 if (void_type_id != NULL) { 1873 std::vector<uint16_t> no_args; 1874 const DexFile::ProtoId* finalizer_proto = 1875 dex_file.FindProtoId(dex_file.GetIndexForTypeId(*void_type_id), no_args); 1876 if (finalizer_proto != NULL) { 1877 // We have the prototype in the dex file 1878 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 1879 klass->SetFinalizable(); 1880 } else { 1881 ClassHelper kh(klass.get()); 1882 StringPiece klass_descriptor(kh.GetDescriptor()); 1883 // The Enum class declares a "final" finalize() method to prevent subclasses from 1884 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 1885 // subclasses, so we exclude it here. 1886 // We also want to avoid setting the flag on Object, where we know that finalize() is 1887 // empty. 1888 if (klass_descriptor != "Ljava/lang/Object;" && 1889 klass_descriptor != "Ljava/lang/Enum;") { 1890 klass->SetFinalizable(); 1891 } 1892 } 1893 } 1894 } 1895 } 1896 } 1897 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 1898 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1899 1900 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 1901 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 1902 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 1903 dst->SetDexCacheInitializedStaticStorage(klass->GetDexCache()->GetInitializedStaticStorage()); 1904 1905 CHECK(dst->IsArtMethod()); 1906 1907 self->EndAssertNoThreadSuspension(old_cause); 1908 return dst; 1909} 1910 1911void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 1912 Thread* self = Thread::Current(); 1913 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1914 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 1915 AppendToBootClassPath(dex_file, dex_cache); 1916} 1917 1918void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1919 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1920 boot_class_path_.push_back(&dex_file); 1921 RegisterDexFile(dex_file, dex_cache); 1922} 1923 1924bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 1925 dex_lock_.AssertSharedHeld(Thread::Current()); 1926 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1927 if (dex_caches_[i]->GetDexFile() == &dex_file) { 1928 return true; 1929 } 1930 } 1931 return false; 1932} 1933 1934bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 1935 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1936 return IsDexFileRegisteredLocked(dex_file); 1937} 1938 1939void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1940 dex_lock_.AssertExclusiveHeld(Thread::Current()); 1941 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1942 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 1943 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 1944 dex_caches_.push_back(dex_cache.get()); 1945 dex_cache->SetDexFile(&dex_file); 1946 dex_caches_dirty_ = true; 1947} 1948 1949void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 1950 Thread* self = Thread::Current(); 1951 { 1952 ReaderMutexLock mu(self, dex_lock_); 1953 if (IsDexFileRegisteredLocked(dex_file)) { 1954 return; 1955 } 1956 } 1957 // Don't alloc while holding the lock, since allocation may need to 1958 // suspend all threads and another thread may need the dex_lock_ to 1959 // get to a suspend point. 1960 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1961 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 1962 { 1963 WriterMutexLock mu(self, dex_lock_); 1964 if (IsDexFileRegisteredLocked(dex_file)) { 1965 return; 1966 } 1967 RegisterDexFileLocked(dex_file, dex_cache); 1968 } 1969} 1970 1971void ClassLinker::RegisterDexFile(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1972 WriterMutexLock mu(Thread::Current(), dex_lock_); 1973 RegisterDexFileLocked(dex_file, dex_cache); 1974} 1975 1976mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 1977 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1978 // Search assuming unique-ness of dex file. 1979 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1980 mirror::DexCache* dex_cache = dex_caches_[i]; 1981 if (dex_cache->GetDexFile() == &dex_file) { 1982 return dex_cache; 1983 } 1984 } 1985 // Search matching by location name. 1986 std::string location(dex_file.GetLocation()); 1987 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1988 mirror::DexCache* dex_cache = dex_caches_[i]; 1989 if (dex_cache->GetDexFile()->GetLocation() == location) { 1990 return dex_cache; 1991 } 1992 } 1993 // Failure, dump diagnostic and abort. 1994 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1995 mirror::DexCache* dex_cache = dex_caches_[i]; 1996 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 1997 } 1998 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 1999 return NULL; 2000} 2001 2002void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 2003 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2004 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2005 dex_caches_[i]->Fixup(resolution_method); 2006 } 2007} 2008 2009mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2010 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2011 if (UNLIKELY(klass == NULL)) { 2012 return NULL; 2013 } 2014 return InitializePrimitiveClass(klass, type); 2015} 2016 2017mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, Primitive::Type type) { 2018 CHECK(primitive_class != NULL); 2019 // Must hold lock on object when initializing. 2020 Thread* self = Thread::Current(); 2021 ObjectLock lock(self, primitive_class); 2022 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2023 primitive_class->SetPrimitiveType(type); 2024 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2025 const char* descriptor = Primitive::Descriptor(type); 2026 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2027 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2028 return primitive_class; 2029} 2030 2031// Create an array class (i.e. the class object for the array, not the 2032// array itself). "descriptor" looks like "[C" or "[[[[B" or 2033// "[Ljava/lang/String;". 2034// 2035// If "descriptor" refers to an array of primitives, look up the 2036// primitive type's internally-generated class object. 2037// 2038// "class_loader" is the class loader of the class that's referring to 2039// us. It's used to ensure that we're looking for the element type in 2040// the right context. It does NOT become the class loader for the 2041// array class; that always comes from the base element class. 2042// 2043// Returns NULL with an exception raised on failure. 2044mirror::Class* ClassLinker::CreateArrayClass(const char* descriptor, 2045 mirror::ClassLoader* class_loader) { 2046 // Identify the underlying component type 2047 CHECK_EQ('[', descriptor[0]); 2048 mirror::Class* component_type = FindClass(descriptor + 1, class_loader); 2049 if (component_type == NULL) { 2050 DCHECK(Thread::Current()->IsExceptionPending()); 2051 return NULL; 2052 } 2053 2054 // See if the component type is already loaded. Array classes are 2055 // always associated with the class loader of their underlying 2056 // element type -- an array of Strings goes with the loader for 2057 // java/lang/String -- so we need to look for it there. (The 2058 // caller should have checked for the existence of the class 2059 // before calling here, but they did so with *their* class loader, 2060 // not the component type's loader.) 2061 // 2062 // If we find it, the caller adds "loader" to the class' initiating 2063 // loader list, which should prevent us from going through this again. 2064 // 2065 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2066 // are the same, because our caller (FindClass) just did the 2067 // lookup. (Even if we get this wrong we still have correct behavior, 2068 // because we effectively do this lookup again when we add the new 2069 // class to the hash table --- necessary because of possible races with 2070 // other threads.) 2071 if (class_loader != component_type->GetClassLoader()) { 2072 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2073 if (new_class != NULL) { 2074 return new_class; 2075 } 2076 } 2077 2078 // Fill out the fields in the Class. 2079 // 2080 // It is possible to execute some methods against arrays, because 2081 // all arrays are subclasses of java_lang_Object_, so we need to set 2082 // up a vtable. We can just point at the one in java_lang_Object_. 2083 // 2084 // Array classes are simple enough that we don't need to do a full 2085 // link step. 2086 Thread* self = Thread::Current(); 2087 SirtRef<mirror::Class> new_class(self, NULL); 2088 if (UNLIKELY(!init_done_)) { 2089 // Classes that were hand created, ie not by FindSystemClass 2090 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2091 new_class.reset(GetClassRoot(kClassArrayClass)); 2092 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2093 new_class.reset(GetClassRoot(kObjectArrayClass)); 2094 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2095 new_class.reset(GetClassRoot(kJavaLangStringArrayClass)); 2096 } else if (strcmp(descriptor, 2097 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2098 new_class.reset(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2099 } else if (strcmp(descriptor, 2100 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2101 new_class.reset(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2102 } else if (strcmp(descriptor, "[C") == 0) { 2103 new_class.reset(GetClassRoot(kCharArrayClass)); 2104 } else if (strcmp(descriptor, "[I") == 0) { 2105 new_class.reset(GetClassRoot(kIntArrayClass)); 2106 } 2107 } 2108 if (new_class.get() == NULL) { 2109 new_class.reset(AllocClass(self, sizeof(mirror::Class))); 2110 if (new_class.get() == NULL) { 2111 return NULL; 2112 } 2113 new_class->SetComponentType(component_type); 2114 } 2115 ObjectLock lock(self, new_class.get()); // Must hold lock on object when initializing. 2116 DCHECK(new_class->GetComponentType() != NULL); 2117 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2118 new_class->SetSuperClass(java_lang_Object); 2119 new_class->SetVTable(java_lang_Object->GetVTable()); 2120 new_class->SetPrimitiveType(Primitive::kPrimNot); 2121 new_class->SetClassLoader(component_type->GetClassLoader()); 2122 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2123 // don't need to set new_class->SetObjectSize(..) 2124 // because Object::SizeOf delegates to Array::SizeOf 2125 2126 2127 // All arrays have java/lang/Cloneable and java/io/Serializable as 2128 // interfaces. We need to set that up here, so that stuff like 2129 // "instanceof" works right. 2130 // 2131 // Note: The GC could run during the call to FindSystemClass, 2132 // so we need to make sure the class object is GC-valid while we're in 2133 // there. Do this by clearing the interface list so the GC will just 2134 // think that the entries are null. 2135 2136 2137 // Use the single, global copies of "interfaces" and "iftable" 2138 // (remember not to free them for arrays). 2139 CHECK(array_iftable_ != NULL); 2140 new_class->SetIfTable(array_iftable_); 2141 2142 // Inherit access flags from the component type. 2143 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2144 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2145 access_flags &= kAccJavaFlagsMask; 2146 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2147 // and remove "interface". 2148 access_flags |= kAccAbstract | kAccFinal; 2149 access_flags &= ~kAccInterface; 2150 2151 new_class->SetAccessFlags(access_flags); 2152 2153 mirror::Class* existing = InsertClass(descriptor, new_class.get(), Hash(descriptor)); 2154 if (existing == NULL) { 2155 return new_class.get(); 2156 } 2157 // Another thread must have loaded the class after we 2158 // started but before we finished. Abandon what we've 2159 // done. 2160 // 2161 // (Yes, this happens.) 2162 2163 return existing; 2164} 2165 2166mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2167 switch (Primitive::GetType(type)) { 2168 case Primitive::kPrimByte: 2169 return GetClassRoot(kPrimitiveByte); 2170 case Primitive::kPrimChar: 2171 return GetClassRoot(kPrimitiveChar); 2172 case Primitive::kPrimDouble: 2173 return GetClassRoot(kPrimitiveDouble); 2174 case Primitive::kPrimFloat: 2175 return GetClassRoot(kPrimitiveFloat); 2176 case Primitive::kPrimInt: 2177 return GetClassRoot(kPrimitiveInt); 2178 case Primitive::kPrimLong: 2179 return GetClassRoot(kPrimitiveLong); 2180 case Primitive::kPrimShort: 2181 return GetClassRoot(kPrimitiveShort); 2182 case Primitive::kPrimBoolean: 2183 return GetClassRoot(kPrimitiveBoolean); 2184 case Primitive::kPrimVoid: 2185 return GetClassRoot(kPrimitiveVoid); 2186 case Primitive::kPrimNot: 2187 break; 2188 } 2189 std::string printable_type(PrintableChar(type)); 2190 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2191 return NULL; 2192} 2193 2194mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2195 size_t hash) { 2196 if (VLOG_IS_ON(class_linker)) { 2197 mirror::DexCache* dex_cache = klass->GetDexCache(); 2198 std::string source; 2199 if (dex_cache != NULL) { 2200 source += " from "; 2201 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2202 } 2203 LOG(INFO) << "Loaded class " << descriptor << source; 2204 } 2205 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2206 mirror::Class* existing = 2207 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2208 if (existing != NULL) { 2209 return existing; 2210 } 2211 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2212 // Check a class loaded with the system class loader matches one in the image if the class 2213 // is in the image. 2214 existing = LookupClassFromImage(descriptor); 2215 if (existing != NULL) { 2216 CHECK(klass == existing); 2217 } 2218 } 2219 Runtime::Current()->GetHeap()->VerifyObject(klass); 2220 class_table_.insert(std::make_pair(hash, klass)); 2221 class_table_dirty_ = true; 2222 return NULL; 2223} 2224 2225bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2226 size_t hash = Hash(descriptor); 2227 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2228 ClassHelper kh; 2229 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2230 ++it) { 2231 mirror::Class* klass = it->second; 2232 kh.ChangeClass(klass); 2233 if (strcmp(kh.GetDescriptor(), descriptor) == 0 && klass->GetClassLoader() == class_loader) { 2234 class_table_.erase(it); 2235 return true; 2236 } 2237 } 2238 return false; 2239} 2240 2241mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2242 const mirror::ClassLoader* class_loader) { 2243 size_t hash = Hash(descriptor); 2244 { 2245 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2246 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2247 if (result != NULL) { 2248 return result; 2249 } 2250 } 2251 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2252 return NULL; 2253 } else { 2254 // Lookup failed but need to search dex_caches_. 2255 mirror::Class* result = LookupClassFromImage(descriptor); 2256 if (result != NULL) { 2257 InsertClass(descriptor, result, hash); 2258 } else { 2259 // Searching the image dex files/caches failed, we don't want to get into this situation 2260 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2261 // classes into the class table. 2262 const int32_t kMaxFailedDexCacheLookups = 1000; 2263 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2264 MoveImageClassesToClassTable(); 2265 } 2266 } 2267 return result; 2268 } 2269} 2270 2271mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2272 const mirror::ClassLoader* class_loader, 2273 size_t hash) { 2274 ClassHelper kh(NULL, this); 2275 auto end = class_table_.end(); 2276 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2277 mirror::Class* klass = it->second; 2278 kh.ChangeClass(klass); 2279 if (klass->GetClassLoader() == class_loader && strcmp(descriptor, kh.GetDescriptor()) == 0) { 2280 if (kIsDebugBuild) { 2281 // Check for duplicates in the table. 2282 for (++it; it != end && it->first == hash; ++it) { 2283 mirror::Class* klass2 = it->second; 2284 kh.ChangeClass(klass2); 2285 CHECK(!(strcmp(descriptor, kh.GetDescriptor()) == 0 && klass2->GetClassLoader() == class_loader)) 2286 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2287 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2288 } 2289 } 2290 return klass; 2291 } 2292 } 2293 return NULL; 2294} 2295 2296static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2297 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2298 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2299 CHECK(image != NULL); 2300 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2301 return root->AsObjectArray<mirror::DexCache>(); 2302} 2303 2304void ClassLinker::MoveImageClassesToClassTable() { 2305 Thread* self = Thread::Current(); 2306 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2307 if (!dex_cache_image_class_lookup_required_) { 2308 return; // All dex cache classes are already in the class table. 2309 } 2310 const char* old_no_suspend_cause = 2311 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2312 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2313 ClassHelper kh(NULL, this); 2314 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2315 mirror::DexCache* dex_cache = dex_caches->Get(i); 2316 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2317 for (int32_t j = 0; j < types->GetLength(); j++) { 2318 mirror::Class* klass = types->Get(j); 2319 if (klass != NULL) { 2320 kh.ChangeClass(klass); 2321 DCHECK(klass->GetClassLoader() == NULL); 2322 const char* descriptor = kh.GetDescriptor(); 2323 size_t hash = Hash(descriptor); 2324 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 2325 if (existing != NULL) { 2326 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2327 << PrettyClassAndClassLoader(klass); 2328 } else { 2329 class_table_.insert(std::make_pair(hash, klass)); 2330 } 2331 } 2332 } 2333 } 2334 class_table_dirty_ = true; 2335 dex_cache_image_class_lookup_required_ = false; 2336 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2337} 2338 2339mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2340 Thread* self = Thread::Current(); 2341 const char* old_no_suspend_cause = 2342 self->StartAssertNoThreadSuspension("Image class lookup"); 2343 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2344 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2345 mirror::DexCache* dex_cache = dex_caches->Get(i); 2346 const DexFile* dex_file = dex_cache->GetDexFile(); 2347 // First search using the class def map, but don't bother for non-class types. 2348 if (descriptor[0] == 'L') { 2349 const DexFile::StringId* descriptor_string_id = dex_file->FindStringId(descriptor); 2350 if (descriptor_string_id != NULL) { 2351 const DexFile::TypeId* type_id = 2352 dex_file->FindTypeId(dex_file->GetIndexForStringId(*descriptor_string_id)); 2353 if (type_id != NULL) { 2354 mirror::Class* klass = dex_cache->GetResolvedType(dex_file->GetIndexForTypeId(*type_id)); 2355 if (klass != NULL) { 2356 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2357 return klass; 2358 } 2359 } 2360 } 2361 } 2362 // Now try binary searching the string/type index. 2363 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2364 if (string_id != NULL) { 2365 const DexFile::TypeId* type_id = 2366 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2367 if (type_id != NULL) { 2368 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2369 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2370 if (klass != NULL) { 2371 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2372 return klass; 2373 } 2374 } 2375 } 2376 } 2377 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2378 return NULL; 2379} 2380 2381void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2382 result.clear(); 2383 if (dex_cache_image_class_lookup_required_) { 2384 MoveImageClassesToClassTable(); 2385 } 2386 size_t hash = Hash(descriptor); 2387 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2388 ClassHelper kh(NULL, this); 2389 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2390 it != end && it->first == hash; ++it) { 2391 mirror::Class* klass = it->second; 2392 kh.ChangeClass(klass); 2393 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2394 result.push_back(klass); 2395 } 2396 } 2397} 2398 2399void ClassLinker::VerifyClass(mirror::Class* klass) { 2400 // TODO: assert that the monitor on the Class is held 2401 Thread* self = Thread::Current(); 2402 ObjectLock lock(self, klass); 2403 2404 // Don't attempt to re-verify if already sufficiently verified. 2405 if (klass->IsVerified() || 2406 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2407 return; 2408 } 2409 2410 // The class might already be erroneous, for example at compile time if we attempted to verify 2411 // this class as a parent to another. 2412 if (klass->IsErroneous()) { 2413 ThrowEarlierClassFailure(klass); 2414 return; 2415 } 2416 2417 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2418 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2419 } else { 2420 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2421 << PrettyClass(klass); 2422 CHECK(!Runtime::Current()->IsCompiler()); 2423 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2424 } 2425 2426 // Verify super class. 2427 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 2428 if (super.get() != NULL) { 2429 // Acquire lock to prevent races on verifying the super class. 2430 ObjectLock lock(self, super.get()); 2431 2432 if (!super->IsVerified() && !super->IsErroneous()) { 2433 VerifyClass(super.get()); 2434 } 2435 if (!super->IsCompileTimeVerified()) { 2436 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2437 PrettyDescriptor(klass).c_str(), 2438 PrettyDescriptor(super.get()).c_str())); 2439 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2440 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 2441 if (cause.get() != NULL) { 2442 self->ClearException(); 2443 } 2444 ThrowVerifyError(klass, "%s", error_msg.c_str()); 2445 if (cause.get() != NULL) { 2446 self->GetException(NULL)->SetCause(cause.get()); 2447 } 2448 klass->SetStatus(mirror::Class::kStatusError, self); 2449 return; 2450 } 2451 } 2452 2453 // Try to use verification information from the oat file, otherwise do runtime verification. 2454 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2455 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2456 bool preverified = VerifyClassUsingOatFile(dex_file, klass, oat_file_class_status); 2457 if (oat_file_class_status == mirror::Class::kStatusError) { 2458 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2459 << PrettyDescriptor(klass) << " in " 2460 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2461 ThrowVerifyError(klass, "Rejecting class %s because it failed compile-time verification", 2462 PrettyDescriptor(klass).c_str()); 2463 klass->SetStatus(mirror::Class::kStatusError, self); 2464 return; 2465 } 2466 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2467 std::string error_msg; 2468 if (!preverified) { 2469 verifier_failure = verifier::MethodVerifier::VerifyClass(klass, 2470 Runtime::Current()->IsCompiler(), 2471 &error_msg); 2472 } 2473 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2474 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2475 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass) 2476 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2477 << " because: " << error_msg; 2478 } 2479 self->AssertNoPendingException(); 2480 // Make sure all classes referenced by catch blocks are resolved. 2481 ResolveClassExceptionHandlerTypes(dex_file, klass); 2482 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2483 // Even though there were no verifier failures we need to respect whether the super-class 2484 // was verified or requiring runtime reverification. 2485 if (super.get() == NULL || super->IsVerified()) { 2486 klass->SetStatus(mirror::Class::kStatusVerified, self); 2487 } else { 2488 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2489 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2490 // Pretend a soft failure occured so that we don't consider the class verified below. 2491 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2492 } 2493 } else { 2494 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2495 // Soft failures at compile time should be retried at runtime. Soft 2496 // failures at runtime will be handled by slow paths in the generated 2497 // code. Set status accordingly. 2498 if (Runtime::Current()->IsCompiler()) { 2499 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2500 } else { 2501 klass->SetStatus(mirror::Class::kStatusVerified, self); 2502 } 2503 } 2504 } else { 2505 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass) 2506 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2507 << " because: " << error_msg; 2508 self->AssertNoPendingException(); 2509 ThrowVerifyError(klass, "%s", error_msg.c_str()); 2510 klass->SetStatus(mirror::Class::kStatusError, self); 2511 } 2512 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2513 // Class is verified so we don't need to do any access check on its methods. 2514 // Let the interpreter know it by setting the kAccPreverified flag onto each 2515 // method. 2516 // Note: we're going here during compilation and at runtime. When we set the 2517 // kAccPreverified flag when compiling image classes, the flag is recorded 2518 // in the image and is set when loading the image. 2519 klass->SetPreverifiedFlagOnAllMethods(); 2520 } 2521} 2522 2523bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2524 mirror::Class::Status& oat_file_class_status) { 2525 // If we're compiling, we can only verify the class using the oat file if 2526 // we are not compiling the image or if the class we're verifying is not part of 2527 // the app. In other words, we will only check for preverification of bootclasspath 2528 // classes. 2529 if (Runtime::Current()->IsCompiler()) { 2530 // Are we compiling the bootclasspath? 2531 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2532 return false; 2533 } 2534 // We are compiling an app (not the image). 2535 2536 // Is this an app class? (I.e. not a bootclasspath class) 2537 if (klass->GetClassLoader() != NULL) { 2538 return false; 2539 } 2540 } 2541 2542 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2543 // Make this work with gtests, which do not set up the image properly. 2544 // TODO: we should clean up gtests to set up the image path properly. 2545 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2546 return false; 2547 } 2548 2549 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2550 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2551 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation(), 2552 &dex_location_checksum); 2553 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2554 const char* descriptor = ClassHelper(klass).GetDescriptor(); 2555 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2556 UniquePtr<const OatFile::OatClass> oat_class(oat_dex_file->GetOatClass(class_def_index)); 2557 CHECK(oat_class.get() != NULL) 2558 << dex_file.GetLocation() << " " << PrettyClass(klass) << " " << descriptor; 2559 oat_file_class_status = oat_class->GetStatus(); 2560 if (oat_file_class_status == mirror::Class::kStatusVerified || 2561 oat_file_class_status == mirror::Class::kStatusInitialized) { 2562 return true; 2563 } 2564 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2565 // Compile time verification failed with a soft error. Compile time verification can fail 2566 // because we have incomplete type information. Consider the following: 2567 // class ... { 2568 // Foo x; 2569 // .... () { 2570 // if (...) { 2571 // v1 gets assigned a type of resolved class Foo 2572 // } else { 2573 // v1 gets assigned a type of unresolved class Bar 2574 // } 2575 // iput x = v1 2576 // } } 2577 // when we merge v1 following the if-the-else it results in Conflict 2578 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2579 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2580 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2581 // at compile time). 2582 return false; 2583 } 2584 if (oat_file_class_status == mirror::Class::kStatusError) { 2585 // Compile time verification failed with a hard error. This is caused by invalid instructions 2586 // in the class. These errors are unrecoverable. 2587 return false; 2588 } 2589 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2590 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2591 // not loading the class. 2592 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2593 // isn't a problem and this case shouldn't occur 2594 return false; 2595 } 2596 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2597 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " << descriptor; 2598 2599 return false; 2600} 2601 2602void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, mirror::Class* klass) { 2603 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2604 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2605 } 2606 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2607 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2608 } 2609} 2610 2611void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2612 mirror::ArtMethod* method) { 2613 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2614 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2615 if (code_item == NULL) { 2616 return; // native or abstract method 2617 } 2618 if (code_item->tries_size_ == 0) { 2619 return; // nothing to process 2620 } 2621 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2622 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2623 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2624 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2625 CatchHandlerIterator iterator(handlers_ptr); 2626 for (; iterator.HasNext(); iterator.Next()) { 2627 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2628 // unresolved exception types will be ignored by exception delivery 2629 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2630 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2631 if (exception_type == NULL) { 2632 DCHECK(Thread::Current()->IsExceptionPending()); 2633 Thread::Current()->ClearException(); 2634 } 2635 } 2636 } 2637 handlers_ptr = iterator.EndDataPointer(); 2638 } 2639} 2640 2641static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2642static void CheckProxyMethod(mirror::ArtMethod* method, 2643 SirtRef<mirror::ArtMethod>& prototype); 2644 2645mirror::Class* ClassLinker::CreateProxyClass(mirror::String* name, 2646 mirror::ObjectArray<mirror::Class>* interfaces, 2647 mirror::ClassLoader* loader, 2648 mirror::ObjectArray<mirror::ArtMethod>* methods, 2649 mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >* throws) { 2650 Thread* self = Thread::Current(); 2651 SirtRef<mirror::Class> klass(self, AllocClass(self, GetClassRoot(kJavaLangClass), 2652 sizeof(mirror::SynthesizedProxyClass))); 2653 if (klass.get() == NULL) { 2654 CHECK(self->IsExceptionPending()); // OOME. 2655 return NULL; 2656 } 2657 DCHECK(klass->GetClass() != NULL); 2658 klass->SetObjectSize(sizeof(mirror::Proxy)); 2659 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2660 klass->SetClassLoader(loader); 2661 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2662 klass->SetName(name); 2663 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2664 klass->SetDexCache(proxy_class->GetDexCache()); 2665 2666 klass->SetStatus(mirror::Class::kStatusIdx, self); 2667 2668 // Instance fields are inherited, but we add a couple of static fields... 2669 { 2670 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2671 if (UNLIKELY(sfields == NULL)) { 2672 CHECK(self->IsExceptionPending()); // OOME. 2673 return NULL; 2674 } 2675 klass->SetSFields(sfields); 2676 } 2677 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2678 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2679 SirtRef<mirror::ArtField> interfaces_sfield(self, AllocArtField(self)); 2680 if (UNLIKELY(interfaces_sfield.get() == NULL)) { 2681 CHECK(self->IsExceptionPending()); // OOME. 2682 return NULL; 2683 } 2684 klass->SetStaticField(0, interfaces_sfield.get()); 2685 interfaces_sfield->SetDexFieldIndex(0); 2686 interfaces_sfield->SetDeclaringClass(klass.get()); 2687 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2688 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2689 SirtRef<mirror::ArtField> throws_sfield(self, AllocArtField(self)); 2690 if (UNLIKELY(throws_sfield.get() == NULL)) { 2691 CHECK(self->IsExceptionPending()); // OOME. 2692 return NULL; 2693 } 2694 klass->SetStaticField(1, throws_sfield.get()); 2695 throws_sfield->SetDexFieldIndex(1); 2696 throws_sfield->SetDeclaringClass(klass.get()); 2697 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2698 2699 // Proxies have 1 direct method, the constructor 2700 { 2701 mirror::ObjectArray<mirror::ArtMethod>* directs = 2702 AllocArtMethodArray(self, 1); 2703 if (UNLIKELY(directs == NULL)) { 2704 CHECK(self->IsExceptionPending()); // OOME. 2705 return NULL; 2706 } 2707 klass->SetDirectMethods(directs); 2708 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2709 if (UNLIKELY(constructor == NULL)) { 2710 CHECK(self->IsExceptionPending()); // OOME. 2711 return NULL; 2712 } 2713 klass->SetDirectMethod(0, constructor); 2714 } 2715 2716 // Create virtual method using specified prototypes 2717 size_t num_virtual_methods = methods->GetLength(); 2718 { 2719 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2720 AllocArtMethodArray(self, num_virtual_methods); 2721 if (UNLIKELY(virtuals == NULL)) { 2722 CHECK(self->IsExceptionPending()); // OOME. 2723 return NULL; 2724 } 2725 klass->SetVirtualMethods(virtuals); 2726 } 2727 for (size_t i = 0; i < num_virtual_methods; ++i) { 2728 SirtRef<mirror::ArtMethod> prototype(self, methods->Get(i)); 2729 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2730 if (UNLIKELY(clone == NULL)) { 2731 CHECK(self->IsExceptionPending()); // OOME. 2732 return NULL; 2733 } 2734 klass->SetVirtualMethod(i, clone); 2735 } 2736 2737 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2738 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Class is now effectively in the loaded state 2739 self->AssertNoPendingException(); 2740 2741 { 2742 ObjectLock lock(self, klass.get()); // Must hold lock on object when resolved. 2743 // Link the fields and virtual methods, creating vtable and iftables 2744 if (!LinkClass(klass, interfaces, self)) { 2745 klass->SetStatus(mirror::Class::kStatusError, self); 2746 return NULL; 2747 } 2748 2749 interfaces_sfield->SetObject(klass.get(), interfaces); 2750 throws_sfield->SetObject(klass.get(), throws); 2751 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2752 } 2753 2754 // sanity checks 2755 if (kIsDebugBuild) { 2756 CHECK(klass->GetIFields() == NULL); 2757 CheckProxyConstructor(klass->GetDirectMethod(0)); 2758 for (size_t i = 0; i < num_virtual_methods; ++i) { 2759 SirtRef<mirror::ArtMethod> prototype(self, methods->Get(i)); 2760 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2761 } 2762 2763 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2764 name->ToModifiedUtf8().c_str())); 2765 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2766 2767 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2768 name->ToModifiedUtf8().c_str())); 2769 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2770 2771 mirror::SynthesizedProxyClass* synth_proxy_class = 2772 down_cast<mirror::SynthesizedProxyClass*>(klass.get()); 2773 CHECK_EQ(synth_proxy_class->GetInterfaces(), interfaces); 2774 CHECK_EQ(synth_proxy_class->GetThrows(), throws); 2775 } 2776 return klass.get(); 2777} 2778 2779std::string ClassLinker::GetDescriptorForProxy(const mirror::Class* proxy_class) { 2780 DCHECK(proxy_class->IsProxyClass()); 2781 mirror::String* name = proxy_class->GetName(); 2782 DCHECK(name != NULL); 2783 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2784} 2785 2786mirror::ArtMethod* ClassLinker::FindMethodForProxy(const mirror::Class* proxy_class, 2787 const mirror::ArtMethod* proxy_method) { 2788 DCHECK(proxy_class->IsProxyClass()); 2789 DCHECK(proxy_method->IsProxyMethod()); 2790 // Locate the dex cache of the original interface/Object 2791 mirror::DexCache* dex_cache = NULL; 2792 { 2793 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2794 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2795 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2796 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2797 dex_cache = dex_caches_[i]; 2798 break; 2799 } 2800 } 2801 } 2802 CHECK(dex_cache != NULL); 2803 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2804 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2805 CHECK(resolved_method != NULL); 2806 return resolved_method; 2807} 2808 2809 2810mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2811 SirtRef<mirror::Class>& klass, 2812 mirror::Class* proxy_class) { 2813 // Create constructor for Proxy that must initialize h 2814 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2815 proxy_class->GetDirectMethods(); 2816 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2817 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2818 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2819 // code_ too) 2820 mirror::ArtMethod* constructor = 2821 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2822 if (constructor == NULL) { 2823 CHECK(self->IsExceptionPending()); // OOME. 2824 return NULL; 2825 } 2826 // Make this constructor public and fix the class to be our Proxy version 2827 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2828 constructor->SetDeclaringClass(klass.get()); 2829 return constructor; 2830} 2831 2832static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2833 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2834 CHECK(constructor->IsConstructor()); 2835 MethodHelper mh(constructor); 2836 CHECK_STREQ(mh.GetName(), "<init>"); 2837 CHECK_EQ(mh.GetSignature(), std::string("(Ljava/lang/reflect/InvocationHandler;)V")); 2838 DCHECK(constructor->IsPublic()); 2839} 2840 2841mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, SirtRef<mirror::Class>& klass, 2842 SirtRef<mirror::ArtMethod>& prototype) { 2843 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2844 // prototype method 2845 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2846 prototype.get()); 2847 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2848 // as necessary 2849 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 2850 if (UNLIKELY(method == NULL)) { 2851 CHECK(self->IsExceptionPending()); // OOME. 2852 return NULL; 2853 } 2854 2855 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 2856 // the intersection of throw exceptions as defined in Proxy 2857 method->SetDeclaringClass(klass.get()); 2858 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 2859 2860 // At runtime the method looks like a reference and argument saving method, clone the code 2861 // related parameters from this method. 2862 mirror::ArtMethod* refs_and_args = 2863 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 2864 method->SetCoreSpillMask(refs_and_args->GetCoreSpillMask()); 2865 method->SetFpSpillMask(refs_and_args->GetFpSpillMask()); 2866 method->SetFrameSizeInBytes(refs_and_args->GetFrameSizeInBytes()); 2867 method->SetEntryPointFromCompiledCode(GetProxyInvokeHandler()); 2868 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2869 2870 return method; 2871} 2872 2873static void CheckProxyMethod(mirror::ArtMethod* method, 2874 SirtRef<mirror::ArtMethod>& prototype) 2875 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2876 // Basic sanity 2877 CHECK(!prototype->IsFinal()); 2878 CHECK(method->IsFinal()); 2879 CHECK(!method->IsAbstract()); 2880 2881 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 2882 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 2883 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 2884 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 2885 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 2886 CHECK_EQ(prototype->GetDexCacheInitializedStaticStorage(), 2887 method->GetDexCacheInitializedStaticStorage()); 2888 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 2889 2890 MethodHelper mh(method); 2891 MethodHelper mh2(prototype.get()); 2892 CHECK_STREQ(mh.GetName(), mh2.GetName()); 2893 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 2894 // More complex sanity - via dex cache 2895 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 2896} 2897 2898static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 2899 bool can_init_parents) 2900 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2901 if (can_init_statics && can_init_statics) { 2902 return true; 2903 } 2904 if (!can_init_statics) { 2905 // Check if there's a class initializer. 2906 mirror::ArtMethod* clinit = klass->FindDeclaredDirectMethod("<clinit>", "()V"); 2907 if (clinit != NULL) { 2908 return false; 2909 } 2910 // Check if there are encoded static values needing initialization. 2911 if (klass->NumStaticFields() != 0) { 2912 ClassHelper kh(klass); 2913 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 2914 DCHECK(dex_class_def != NULL); 2915 if (dex_class_def->static_values_off_ != 0) { 2916 return false; 2917 } 2918 } 2919 } 2920 if (!klass->IsInterface() && klass->HasSuperClass()) { 2921 mirror::Class* super_class = klass->GetSuperClass(); 2922 if (!can_init_parents && !super_class->IsInitialized()) { 2923 return false; 2924 } else { 2925 if (!CanWeInitializeClass(super_class, can_init_statics, true)) { 2926 return false; 2927 } 2928 } 2929 } 2930 return true; 2931} 2932 2933bool ClassLinker::InitializeClass(mirror::Class* klass, bool can_init_statics, 2934 bool can_init_parents) { 2935 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 2936 2937 // Are we already initialized and therefore done? 2938 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 2939 // an initialized class will never change its state. 2940 if (klass->IsInitialized()) { 2941 return true; 2942 } 2943 2944 // Fast fail if initialization requires a full runtime. Not part of the JLS. 2945 if (!CanWeInitializeClass(klass, can_init_statics, can_init_parents)) { 2946 return false; 2947 } 2948 2949 Thread* self = Thread::Current(); 2950 uint64_t t0; 2951 { 2952 ObjectLock lock(self, klass); 2953 2954 // Re-check under the lock in case another thread initialized ahead of us. 2955 if (klass->IsInitialized()) { 2956 return true; 2957 } 2958 2959 // Was the class already found to be erroneous? Done under the lock to match the JLS. 2960 if (klass->IsErroneous()) { 2961 ThrowEarlierClassFailure(klass); 2962 return false; 2963 } 2964 2965 CHECK(klass->IsResolved()) << PrettyClass(klass) << ": state=" << klass->GetStatus(); 2966 2967 if (!klass->IsVerified()) { 2968 VerifyClass(klass); 2969 if (!klass->IsVerified()) { 2970 // We failed to verify, expect either the klass to be erroneous or verification failed at 2971 // compile time. 2972 if (klass->IsErroneous()) { 2973 CHECK(self->IsExceptionPending()); 2974 } else { 2975 CHECK(Runtime::Current()->IsCompiler()); 2976 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2977 } 2978 return false; 2979 } 2980 } 2981 2982 // If the class is kStatusInitializing, either this thread is 2983 // initializing higher up the stack or another thread has beat us 2984 // to initializing and we need to wait. Either way, this 2985 // invocation of InitializeClass will not be responsible for 2986 // running <clinit> and will return. 2987 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 2988 // We caught somebody else in the act; was it us? 2989 if (klass->GetClinitThreadId() == self->GetTid()) { 2990 // Yes. That's fine. Return so we can continue initializing. 2991 return true; 2992 } 2993 // No. That's fine. Wait for another thread to finish initializing. 2994 return WaitForInitializeClass(klass, self, lock); 2995 } 2996 2997 if (!ValidateSuperClassDescriptors(klass)) { 2998 klass->SetStatus(mirror::Class::kStatusError, self); 2999 return false; 3000 } 3001 3002 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass); 3003 3004 // From here out other threads may observe that we're initializing and so changes of state 3005 // require the a notification. 3006 klass->SetClinitThreadId(self->GetTid()); 3007 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3008 3009 t0 = NanoTime(); 3010 } 3011 3012 // Initialize super classes, must be done while initializing for the JLS. 3013 if (!klass->IsInterface() && klass->HasSuperClass()) { 3014 mirror::Class* super_class = klass->GetSuperClass(); 3015 if (!super_class->IsInitialized()) { 3016 CHECK(!super_class->IsInterface()); 3017 CHECK(can_init_parents); 3018 bool super_initialized = InitializeClass(super_class, can_init_statics, true); 3019 if (!super_initialized) { 3020 // The super class was verified ahead of entering initializing, we should only be here if 3021 // the super class became erroneous due to initialization. 3022 CHECK(super_class->IsErroneous() && self->IsExceptionPending()) 3023 << "Super class initialization failed for " << PrettyDescriptor(super_class) 3024 << " that has unexpected status " << super_class->GetStatus() 3025 << "\nPending exception:\n" 3026 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3027 ObjectLock lock(self, klass); 3028 // Initialization failed because the super-class is erroneous. 3029 klass->SetStatus(mirror::Class::kStatusError, self); 3030 return false; 3031 } 3032 } 3033 } 3034 3035 if (klass->NumStaticFields() > 0) { 3036 ClassHelper kh(klass); 3037 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3038 CHECK(dex_class_def != NULL); 3039 const DexFile& dex_file = kh.GetDexFile(); 3040 EncodedStaticFieldValueIterator it(dex_file, kh.GetDexCache(), klass->GetClassLoader(), 3041 this, *dex_class_def); 3042 if (it.HasNext()) { 3043 CHECK(can_init_statics); 3044 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 3045 SafeMap<uint32_t, mirror::ArtField*> field_map; 3046 ConstructFieldMap(dex_file, *dex_class_def, klass, field_map); 3047 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3048 it.ReadValueToField(field_map.Get(i)); 3049 } 3050 } 3051 } 3052 3053 mirror::ArtMethod* clinit = klass->FindDeclaredDirectMethod("<clinit>", "()V"); 3054 if (clinit != NULL) { 3055 CHECK(can_init_statics); 3056 if (LIKELY(Runtime::Current()->IsStarted())) { 3057 JValue result; 3058 clinit->Invoke(self, NULL, 0, &result, 'V'); 3059 } else { 3060 art::interpreter::EnterInterpreterFromInvoke(self, clinit, NULL, NULL, NULL); 3061 } 3062 } 3063 3064 // Opportunistically set static method trampolines to their destination. 3065 FixupStaticTrampolines(klass); 3066 3067 uint64_t t1 = NanoTime(); 3068 3069 bool success = true; 3070 { 3071 ObjectLock lock(self, klass); 3072 3073 if (self->IsExceptionPending()) { 3074 WrapExceptionInInitializer(); 3075 klass->SetStatus(mirror::Class::kStatusError, self); 3076 success = false; 3077 } else { 3078 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3079 RuntimeStats* thread_stats = self->GetStats(); 3080 ++global_stats->class_init_count; 3081 ++thread_stats->class_init_count; 3082 global_stats->class_init_time_ns += (t1 - t0); 3083 thread_stats->class_init_time_ns += (t1 - t0); 3084 // Set the class as initialized except if failed to initialize static fields. 3085 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3086 if (VLOG_IS_ON(class_linker)) { 3087 ClassHelper kh(klass); 3088 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 3089 } 3090 } 3091 } 3092 return success; 3093} 3094 3095bool ClassLinker::WaitForInitializeClass(mirror::Class* klass, Thread* self, ObjectLock& lock) 3096 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3097 while (true) { 3098 self->AssertNoPendingException(); 3099 CHECK(!klass->IsInitialized()); 3100 lock.WaitIgnoringInterrupts(); 3101 3102 // When we wake up, repeat the test for init-in-progress. If 3103 // there's an exception pending (only possible if 3104 // "interruptShouldThrow" was set), bail out. 3105 if (self->IsExceptionPending()) { 3106 WrapExceptionInInitializer(); 3107 klass->SetStatus(mirror::Class::kStatusError, self); 3108 return false; 3109 } 3110 // Spurious wakeup? Go back to waiting. 3111 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3112 continue; 3113 } 3114 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3115 // Compile time initialization failed. 3116 return false; 3117 } 3118 if (klass->IsErroneous()) { 3119 // The caller wants an exception, but it was thrown in a 3120 // different thread. Synthesize one here. 3121 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3122 PrettyDescriptor(klass).c_str()); 3123 return false; 3124 } 3125 if (klass->IsInitialized()) { 3126 return true; 3127 } 3128 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass) << " is " << klass->GetStatus(); 3129 } 3130 LOG(FATAL) << "Not Reached" << PrettyClass(klass); 3131} 3132 3133bool ClassLinker::ValidateSuperClassDescriptors(const mirror::Class* klass) { 3134 if (klass->IsInterface()) { 3135 return true; 3136 } 3137 // begin with the methods local to the superclass 3138 if (klass->HasSuperClass() && 3139 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3140 const mirror::Class* super = klass->GetSuperClass(); 3141 for (int i = super->GetVTable()->GetLength() - 1; i >= 0; --i) { 3142 const mirror::ArtMethod* method = klass->GetVTable()->Get(i); 3143 if (method != super->GetVTable()->Get(i) && 3144 !IsSameMethodSignatureInDifferentClassContexts(method, super, klass)) { 3145 ThrowLinkageError(klass, "Class %s method %s resolves differently in superclass %s", 3146 PrettyDescriptor(klass).c_str(), PrettyMethod(method).c_str(), 3147 PrettyDescriptor(super).c_str()); 3148 return false; 3149 } 3150 } 3151 } 3152 mirror::IfTable* iftable = klass->GetIfTable(); 3153 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3154 mirror::Class* interface = iftable->GetInterface(i); 3155 if (klass->GetClassLoader() != interface->GetClassLoader()) { 3156 for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { 3157 const mirror::ArtMethod* method = iftable->GetMethodArray(i)->Get(j); 3158 if (!IsSameMethodSignatureInDifferentClassContexts(method, interface, 3159 method->GetDeclaringClass())) { 3160 ThrowLinkageError(klass, "Class %s method %s resolves differently in interface %s", 3161 PrettyDescriptor(method->GetDeclaringClass()).c_str(), 3162 PrettyMethod(method).c_str(), 3163 PrettyDescriptor(interface).c_str()); 3164 return false; 3165 } 3166 } 3167 } 3168 } 3169 return true; 3170} 3171 3172// Returns true if classes referenced by the signature of the method are the 3173// same classes in klass1 as they are in klass2. 3174bool ClassLinker::IsSameMethodSignatureInDifferentClassContexts(const mirror::ArtMethod* method, 3175 const mirror::Class* klass1, 3176 const mirror::Class* klass2) { 3177 if (klass1 == klass2) { 3178 return true; 3179 } 3180 const DexFile& dex_file = *method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 3181 const DexFile::ProtoId& proto_id = 3182 dex_file.GetMethodPrototype(dex_file.GetMethodId(method->GetDexMethodIndex())); 3183 for (DexFileParameterIterator it(dex_file, proto_id); it.HasNext(); it.Next()) { 3184 const char* descriptor = it.GetDescriptor(); 3185 if (descriptor == NULL) { 3186 break; 3187 } 3188 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3189 // Found a non-primitive type. 3190 if (!IsSameDescriptorInDifferentClassContexts(descriptor, klass1, klass2)) { 3191 return false; 3192 } 3193 } 3194 } 3195 // Check the return type 3196 const char* descriptor = dex_file.GetReturnTypeDescriptor(proto_id); 3197 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3198 if (!IsSameDescriptorInDifferentClassContexts(descriptor, klass1, klass2)) { 3199 return false; 3200 } 3201 } 3202 return true; 3203} 3204 3205// Returns true if the descriptor resolves to the same class in the context of klass1 and klass2. 3206bool ClassLinker::IsSameDescriptorInDifferentClassContexts(const char* descriptor, 3207 const mirror::Class* klass1, 3208 const mirror::Class* klass2) { 3209 CHECK(descriptor != NULL); 3210 CHECK(klass1 != NULL); 3211 CHECK(klass2 != NULL); 3212 if (klass1 == klass2) { 3213 return true; 3214 } 3215 mirror::Class* found1 = FindClass(descriptor, klass1->GetClassLoader()); 3216 if (found1 == NULL) { 3217 Thread::Current()->ClearException(); 3218 } 3219 mirror::Class* found2 = FindClass(descriptor, klass2->GetClassLoader()); 3220 if (found2 == NULL) { 3221 Thread::Current()->ClearException(); 3222 } 3223 return found1 == found2; 3224} 3225 3226bool ClassLinker::EnsureInitialized(mirror::Class* c, bool can_init_fields, bool can_init_parents) { 3227 DCHECK(c != NULL); 3228 if (c->IsInitialized()) { 3229 return true; 3230 } 3231 3232 bool success = InitializeClass(c, can_init_fields, can_init_parents); 3233 if (!success) { 3234 Thread* self = Thread::Current(); 3235 CHECK(self->IsExceptionPending() || !can_init_fields || !can_init_parents) << PrettyClass(c); 3236 } 3237 return success; 3238} 3239 3240void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3241 mirror::Class* c, SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3242 mirror::ClassLoader* cl = c->GetClassLoader(); 3243 const byte* class_data = dex_file.GetClassData(dex_class_def); 3244 ClassDataItemIterator it(dex_file, class_data); 3245 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3246 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), c->GetDexCache(), cl, true)); 3247 } 3248} 3249 3250bool ClassLinker::LinkClass(SirtRef<mirror::Class>& klass, 3251 mirror::ObjectArray<mirror::Class>* interfaces, Thread* self) { 3252 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3253 if (!LinkSuperClass(klass)) { 3254 return false; 3255 } 3256 if (!LinkMethods(klass, interfaces)) { 3257 return false; 3258 } 3259 if (!LinkInstanceFields(klass)) { 3260 return false; 3261 } 3262 if (!LinkStaticFields(klass)) { 3263 return false; 3264 } 3265 CreateReferenceInstanceOffsets(klass); 3266 CreateReferenceStaticOffsets(klass); 3267 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3268 klass->SetStatus(mirror::Class::kStatusResolved, self); 3269 return true; 3270} 3271 3272bool ClassLinker::LoadSuperAndInterfaces(SirtRef<mirror::Class>& klass, const DexFile& dex_file) { 3273 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3274 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3275 uint16_t super_class_idx = class_def.superclass_idx_; 3276 if (super_class_idx != DexFile::kDexNoIndex16) { 3277 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.get()); 3278 if (super_class == NULL) { 3279 DCHECK(Thread::Current()->IsExceptionPending()); 3280 return false; 3281 } 3282 // Verify 3283 if (!klass->CanAccess(super_class)) { 3284 ThrowIllegalAccessError(klass.get(), "Class %s extended by class %s is inaccessible", 3285 PrettyDescriptor(super_class).c_str(), 3286 PrettyDescriptor(klass.get()).c_str()); 3287 return false; 3288 } 3289 klass->SetSuperClass(super_class); 3290 } 3291 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3292 if (interfaces != NULL) { 3293 for (size_t i = 0; i < interfaces->Size(); i++) { 3294 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3295 mirror::Class* interface = ResolveType(dex_file, idx, klass.get()); 3296 if (interface == NULL) { 3297 DCHECK(Thread::Current()->IsExceptionPending()); 3298 return false; 3299 } 3300 // Verify 3301 if (!klass->CanAccess(interface)) { 3302 // TODO: the RI seemed to ignore this in my testing. 3303 ThrowIllegalAccessError(klass.get(), "Interface %s implemented by class %s is inaccessible", 3304 PrettyDescriptor(interface).c_str(), 3305 PrettyDescriptor(klass.get()).c_str()); 3306 return false; 3307 } 3308 } 3309 } 3310 // Mark the class as loaded. 3311 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3312 return true; 3313} 3314 3315bool ClassLinker::LinkSuperClass(SirtRef<mirror::Class>& klass) { 3316 CHECK(!klass->IsPrimitive()); 3317 mirror::Class* super = klass->GetSuperClass(); 3318 if (klass.get() == GetClassRoot(kJavaLangObject)) { 3319 if (super != NULL) { 3320 ThrowClassFormatError(klass.get(), "java.lang.Object must not have a superclass"); 3321 return false; 3322 } 3323 return true; 3324 } 3325 if (super == NULL) { 3326 ThrowLinkageError(klass.get(), "No superclass defined for class %s", 3327 PrettyDescriptor(klass.get()).c_str()); 3328 return false; 3329 } 3330 // Verify 3331 if (super->IsFinal() || super->IsInterface()) { 3332 ThrowIncompatibleClassChangeError(klass.get(), "Superclass %s of %s is %s", 3333 PrettyDescriptor(super).c_str(), 3334 PrettyDescriptor(klass.get()).c_str(), 3335 super->IsFinal() ? "declared final" : "an interface"); 3336 return false; 3337 } 3338 if (!klass->CanAccess(super)) { 3339 ThrowIllegalAccessError(klass.get(), "Superclass %s is inaccessible to class %s", 3340 PrettyDescriptor(super).c_str(), 3341 PrettyDescriptor(klass.get()).c_str()); 3342 return false; 3343 } 3344 3345 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3346 if (super->IsFinalizable()) { 3347 klass->SetFinalizable(); 3348 } 3349 3350 // Inherit reference flags (if any) from the superclass. 3351 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3352 if (reference_flags != 0) { 3353 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3354 } 3355 // Disallow custom direct subclasses of java.lang.ref.Reference. 3356 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3357 ThrowLinkageError(klass.get(), 3358 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3359 PrettyDescriptor(klass.get()).c_str()); 3360 return false; 3361 } 3362 3363 if (kIsDebugBuild) { 3364 // Ensure super classes are fully resolved prior to resolving fields.. 3365 while (super != NULL) { 3366 CHECK(super->IsResolved()); 3367 super = super->GetSuperClass(); 3368 } 3369 } 3370 return true; 3371} 3372 3373// Populate the class vtable and itable. Compute return type indices. 3374bool ClassLinker::LinkMethods(SirtRef<mirror::Class>& klass, 3375 mirror::ObjectArray<mirror::Class>* interfaces) { 3376 if (klass->IsInterface()) { 3377 // No vtable. 3378 size_t count = klass->NumVirtualMethods(); 3379 if (!IsUint(16, count)) { 3380 ThrowClassFormatError(klass.get(), "Too many methods on interface: %zd", count); 3381 return false; 3382 } 3383 for (size_t i = 0; i < count; ++i) { 3384 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3385 } 3386 // Link interface method tables 3387 return LinkInterfaceMethods(klass, interfaces); 3388 } else { 3389 // Link virtual and interface method tables 3390 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3391 } 3392 return true; 3393} 3394 3395bool ClassLinker::LinkVirtualMethods(SirtRef<mirror::Class>& klass) { 3396 Thread* self = Thread::Current(); 3397 if (klass->HasSuperClass()) { 3398 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3399 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3400 CHECK_LE(actual_count, max_count); 3401 // TODO: do not assign to the vtable field until it is fully constructed. 3402 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3403 vtable(self, klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count)); 3404 if (UNLIKELY(vtable.get() == NULL)) { 3405 CHECK(self->IsExceptionPending()); // OOME. 3406 return false; 3407 } 3408 // See if any of our virtual methods override the superclass. 3409 MethodHelper local_mh(NULL, this); 3410 MethodHelper super_mh(NULL, this); 3411 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3412 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3413 local_mh.ChangeMethod(local_method); 3414 size_t j = 0; 3415 for (; j < actual_count; ++j) { 3416 mirror::ArtMethod* super_method = vtable->Get(j); 3417 super_mh.ChangeMethod(super_method); 3418 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3419 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3420 if (super_method->IsFinal()) { 3421 ThrowLinkageError(klass.get(), "Method %s overrides final method in class %s", 3422 PrettyMethod(local_method).c_str(), 3423 super_mh.GetDeclaringClassDescriptor()); 3424 return false; 3425 } 3426 vtable->Set(j, local_method); 3427 local_method->SetMethodIndex(j); 3428 break; 3429 } else { 3430 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3431 << " would have incorrectly overridden the package-private method in " 3432 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3433 } 3434 } 3435 } 3436 if (j == actual_count) { 3437 // Not overriding, append. 3438 vtable->Set(actual_count, local_method); 3439 local_method->SetMethodIndex(actual_count); 3440 actual_count += 1; 3441 } 3442 } 3443 if (!IsUint(16, actual_count)) { 3444 ThrowClassFormatError(klass.get(), "Too many methods defined on class: %zd", actual_count); 3445 return false; 3446 } 3447 // Shrink vtable if possible 3448 CHECK_LE(actual_count, max_count); 3449 if (actual_count < max_count) { 3450 vtable.reset(vtable->CopyOf(self, actual_count)); 3451 if (UNLIKELY(vtable.get() == NULL)) { 3452 CHECK(self->IsExceptionPending()); // OOME. 3453 return false; 3454 } 3455 } 3456 klass->SetVTable(vtable.get()); 3457 } else { 3458 CHECK(klass.get() == GetClassRoot(kJavaLangObject)); 3459 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3460 if (!IsUint(16, num_virtual_methods)) { 3461 ThrowClassFormatError(klass.get(), "Too many methods: %d", num_virtual_methods); 3462 return false; 3463 } 3464 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3465 vtable(self, AllocArtMethodArray(self, num_virtual_methods)); 3466 if (UNLIKELY(vtable.get() == NULL)) { 3467 CHECK(self->IsExceptionPending()); // OOME. 3468 return false; 3469 } 3470 for (size_t i = 0; i < num_virtual_methods; ++i) { 3471 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3472 vtable->Set(i, virtual_method); 3473 virtual_method->SetMethodIndex(i & 0xFFFF); 3474 } 3475 klass->SetVTable(vtable.get()); 3476 } 3477 return true; 3478} 3479 3480bool ClassLinker::LinkInterfaceMethods(SirtRef<mirror::Class>& klass, 3481 mirror::ObjectArray<mirror::Class>* interfaces) { 3482 size_t super_ifcount; 3483 if (klass->HasSuperClass()) { 3484 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3485 } else { 3486 super_ifcount = 0; 3487 } 3488 size_t ifcount = super_ifcount; 3489 ClassHelper kh(klass.get(), this); 3490 uint32_t num_interfaces = interfaces == NULL ? kh.NumDirectInterfaces() : interfaces->GetLength(); 3491 ifcount += num_interfaces; 3492 for (size_t i = 0; i < num_interfaces; i++) { 3493 mirror::Class* interface = interfaces == NULL ? kh.GetDirectInterface(i) : interfaces->Get(i); 3494 ifcount += interface->GetIfTableCount(); 3495 } 3496 if (ifcount == 0) { 3497 // Class implements no interfaces. 3498 DCHECK_EQ(klass->GetIfTableCount(), 0); 3499 DCHECK(klass->GetIfTable() == NULL); 3500 return true; 3501 } 3502 if (ifcount == super_ifcount) { 3503 // Class implements same interfaces as parent, are any of these not marker interfaces? 3504 bool has_non_marker_interface = false; 3505 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3506 for (size_t i = 0; i < ifcount; ++i) { 3507 if (super_iftable->GetMethodArrayCount(i) > 0) { 3508 has_non_marker_interface = true; 3509 break; 3510 } 3511 } 3512 if (!has_non_marker_interface) { 3513 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3514 klass->SetIfTable(super_iftable); 3515 return true; 3516 } 3517 } 3518 Thread* self = Thread::Current(); 3519 SirtRef<mirror::IfTable> iftable(self, AllocIfTable(self, ifcount)); 3520 if (UNLIKELY(iftable.get() == NULL)) { 3521 CHECK(self->IsExceptionPending()); // OOME. 3522 return false; 3523 } 3524 if (super_ifcount != 0) { 3525 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3526 for (size_t i = 0; i < super_ifcount; i++) { 3527 mirror::Class* super_interface = super_iftable->GetInterface(i); 3528 iftable->SetInterface(i, super_interface); 3529 } 3530 } 3531 // Flatten the interface inheritance hierarchy. 3532 size_t idx = super_ifcount; 3533 for (size_t i = 0; i < num_interfaces; i++) { 3534 mirror::Class* interface = interfaces == NULL ? kh.GetDirectInterface(i) : interfaces->Get(i); 3535 DCHECK(interface != NULL); 3536 if (!interface->IsInterface()) { 3537 ClassHelper ih(interface); 3538 ThrowIncompatibleClassChangeError(klass.get(), "Class %s implements non-interface class %s", 3539 PrettyDescriptor(klass.get()).c_str(), 3540 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3541 return false; 3542 } 3543 // Check if interface is already in iftable 3544 bool duplicate = false; 3545 for (size_t j = 0; j < idx; j++) { 3546 mirror::Class* existing_interface = iftable->GetInterface(j); 3547 if (existing_interface == interface) { 3548 duplicate = true; 3549 break; 3550 } 3551 } 3552 if (!duplicate) { 3553 // Add this non-duplicate interface. 3554 iftable->SetInterface(idx++, interface); 3555 // Add this interface's non-duplicate super-interfaces. 3556 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3557 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3558 bool super_duplicate = false; 3559 for (size_t k = 0; k < idx; k++) { 3560 mirror::Class* existing_interface = iftable->GetInterface(k); 3561 if (existing_interface == super_interface) { 3562 super_duplicate = true; 3563 break; 3564 } 3565 } 3566 if (!super_duplicate) { 3567 iftable->SetInterface(idx++, super_interface); 3568 } 3569 } 3570 } 3571 } 3572 // Shrink iftable in case duplicates were found 3573 if (idx < ifcount) { 3574 iftable.reset(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3575 if (UNLIKELY(iftable.get() == NULL)) { 3576 CHECK(self->IsExceptionPending()); // OOME. 3577 return false; 3578 } 3579 ifcount = idx; 3580 } else { 3581 CHECK_EQ(idx, ifcount); 3582 } 3583 klass->SetIfTable(iftable.get()); 3584 3585 // If we're an interface, we don't need the vtable pointers, so we're done. 3586 if (klass->IsInterface()) { 3587 return true; 3588 } 3589 std::vector<mirror::ArtMethod*> miranda_list; 3590 MethodHelper vtable_mh(NULL, this); 3591 MethodHelper interface_mh(NULL, this); 3592 for (size_t i = 0; i < ifcount; ++i) { 3593 mirror::Class* interface = iftable->GetInterface(i); 3594 size_t num_methods = interface->NumVirtualMethods(); 3595 if (num_methods > 0) { 3596 mirror::ObjectArray<mirror::ArtMethod>* method_array = 3597 AllocArtMethodArray(self, num_methods); 3598 if (UNLIKELY(method_array == NULL)) { 3599 CHECK(self->IsExceptionPending()); // OOME. 3600 return false; 3601 } 3602 iftable->SetMethodArray(i, method_array); 3603 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3604 for (size_t j = 0; j < num_methods; ++j) { 3605 mirror::ArtMethod* interface_method = interface->GetVirtualMethod(j); 3606 interface_mh.ChangeMethod(interface_method); 3607 int32_t k; 3608 // For each method listed in the interface's method list, find the 3609 // matching method in our class's method list. We want to favor the 3610 // subclass over the superclass, which just requires walking 3611 // back from the end of the vtable. (This only matters if the 3612 // superclass defines a private method and this class redefines 3613 // it -- otherwise it would use the same vtable slot. In .dex files 3614 // those don't end up in the virtual method table, so it shouldn't 3615 // matter which direction we go. We walk it backward anyway.) 3616 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3617 mirror::ArtMethod* vtable_method = vtable->Get(k); 3618 vtable_mh.ChangeMethod(vtable_method); 3619 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3620 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3621 ThrowIllegalAccessError(klass.get(), 3622 "Method '%s' implementing interface method '%s' is not public", 3623 PrettyMethod(vtable_method).c_str(), 3624 PrettyMethod(interface_method).c_str()); 3625 return false; 3626 } 3627 method_array->Set(j, vtable_method); 3628 break; 3629 } 3630 } 3631 if (k < 0) { 3632 SirtRef<mirror::ArtMethod> miranda_method(self, NULL); 3633 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3634 mirror::ArtMethod* mir_method = miranda_list[mir]; 3635 vtable_mh.ChangeMethod(mir_method); 3636 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3637 miranda_method.reset(miranda_list[mir]); 3638 break; 3639 } 3640 } 3641 if (miranda_method.get() == NULL) { 3642 // Point the interface table at a phantom slot. 3643 miranda_method.reset(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3644 if (UNLIKELY(miranda_method.get() == NULL)) { 3645 CHECK(self->IsExceptionPending()); // OOME. 3646 return false; 3647 } 3648#ifdef MOVING_GARBAGE_COLLECTOR 3649 // TODO: If a methods move then the miranda_list may hold stale references. 3650 UNIMPLEMENTED(FATAL); 3651#endif 3652 miranda_list.push_back(miranda_method.get()); 3653 } 3654 method_array->Set(j, miranda_method.get()); 3655 } 3656 } 3657 } 3658 } 3659 if (!miranda_list.empty()) { 3660 int old_method_count = klass->NumVirtualMethods(); 3661 int new_method_count = old_method_count + miranda_list.size(); 3662 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3663 if (old_method_count == 0) { 3664 virtuals = AllocArtMethodArray(self, new_method_count); 3665 } else { 3666 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3667 } 3668 if (UNLIKELY(virtuals == NULL)) { 3669 CHECK(self->IsExceptionPending()); // OOME. 3670 return false; 3671 } 3672 klass->SetVirtualMethods(virtuals); 3673 3674 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3675 vtable(self, klass->GetVTableDuringLinking()); 3676 CHECK(vtable.get() != NULL); 3677 int old_vtable_count = vtable->GetLength(); 3678 int new_vtable_count = old_vtable_count + miranda_list.size(); 3679 vtable.reset(vtable->CopyOf(self, new_vtable_count)); 3680 if (UNLIKELY(vtable.get() == NULL)) { 3681 CHECK(self->IsExceptionPending()); // OOME. 3682 return false; 3683 } 3684 for (size_t i = 0; i < miranda_list.size(); ++i) { 3685 mirror::ArtMethod* method = miranda_list[i]; 3686 // Leave the declaring class alone as type indices are relative to it 3687 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3688 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3689 klass->SetVirtualMethod(old_method_count + i, method); 3690 vtable->Set(old_vtable_count + i, method); 3691 } 3692 // TODO: do not assign to the vtable field until it is fully constructed. 3693 klass->SetVTable(vtable.get()); 3694 } 3695 3696 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3697 for (int i = 0; i < vtable->GetLength(); ++i) { 3698 CHECK(vtable->Get(i) != NULL); 3699 } 3700 3701// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3702 3703 return true; 3704} 3705 3706bool ClassLinker::LinkInstanceFields(SirtRef<mirror::Class>& klass) { 3707 CHECK(klass.get() != NULL); 3708 return LinkFields(klass, false); 3709} 3710 3711bool ClassLinker::LinkStaticFields(SirtRef<mirror::Class>& klass) { 3712 CHECK(klass.get() != NULL); 3713 size_t allocated_class_size = klass->GetClassSize(); 3714 bool success = LinkFields(klass, true); 3715 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3716 return success; 3717} 3718 3719struct LinkFieldsComparator { 3720 explicit LinkFieldsComparator(FieldHelper* fh) 3721 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 3722 : fh_(fh) {} 3723 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3724 bool operator()(const mirror::ArtField* field1, const mirror::ArtField* field2) 3725 NO_THREAD_SAFETY_ANALYSIS { 3726 // First come reference fields, then 64-bit, and finally 32-bit 3727 fh_->ChangeField(field1); 3728 Primitive::Type type1 = fh_->GetTypeAsPrimitiveType(); 3729 fh_->ChangeField(field2); 3730 Primitive::Type type2 = fh_->GetTypeAsPrimitiveType(); 3731 bool isPrimitive1 = type1 != Primitive::kPrimNot; 3732 bool isPrimitive2 = type2 != Primitive::kPrimNot; 3733 bool is64bit1 = isPrimitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3734 bool is64bit2 = isPrimitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3735 int order1 = (!isPrimitive1 ? 0 : (is64bit1 ? 1 : 2)); 3736 int order2 = (!isPrimitive2 ? 0 : (is64bit2 ? 1 : 2)); 3737 if (order1 != order2) { 3738 return order1 < order2; 3739 } 3740 3741 // same basic group? then sort by string. 3742 fh_->ChangeField(field1); 3743 StringPiece name1(fh_->GetName()); 3744 fh_->ChangeField(field2); 3745 StringPiece name2(fh_->GetName()); 3746 return name1 < name2; 3747 } 3748 3749 FieldHelper* fh_; 3750}; 3751 3752bool ClassLinker::LinkFields(SirtRef<mirror::Class>& klass, bool is_static) { 3753 size_t num_fields = 3754 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3755 3756 mirror::ObjectArray<mirror::ArtField>* fields = 3757 is_static ? klass->GetSFields() : klass->GetIFields(); 3758 3759 // Initialize size and field_offset 3760 size_t size; 3761 MemberOffset field_offset(0); 3762 if (is_static) { 3763 size = klass->GetClassSize(); 3764 field_offset = mirror::Class::FieldsOffset(); 3765 } else { 3766 mirror::Class* super_class = klass->GetSuperClass(); 3767 if (super_class != NULL) { 3768 CHECK(super_class->IsResolved()); 3769 field_offset = MemberOffset(super_class->GetObjectSize()); 3770 } 3771 size = field_offset.Uint32Value(); 3772 } 3773 3774 CHECK_EQ(num_fields == 0, fields == NULL); 3775 3776 // we want a relatively stable order so that adding new fields 3777 // minimizes disruption of C++ version such as Class and Method. 3778 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3779 for (size_t i = 0; i < num_fields; i++) { 3780 grouped_and_sorted_fields.push_back(fields->Get(i)); 3781 } 3782 FieldHelper fh(NULL, this); 3783 std::sort(grouped_and_sorted_fields.begin(), 3784 grouped_and_sorted_fields.end(), 3785 LinkFieldsComparator(&fh)); 3786 3787 // References should be at the front. 3788 size_t current_field = 0; 3789 size_t num_reference_fields = 0; 3790 for (; current_field < num_fields; current_field++) { 3791 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3792 fh.ChangeField(field); 3793 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3794 bool isPrimitive = type != Primitive::kPrimNot; 3795 if (isPrimitive) { 3796 break; // past last reference, move on to the next phase 3797 } 3798 grouped_and_sorted_fields.pop_front(); 3799 num_reference_fields++; 3800 fields->Set(current_field, field); 3801 field->SetOffset(field_offset); 3802 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3803 } 3804 3805 // Now we want to pack all of the double-wide fields together. If 3806 // we're not aligned, though, we want to shuffle one 32-bit field 3807 // into place. If we can't find one, we'll have to pad it. 3808 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3809 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3810 mirror::ArtField* field = grouped_and_sorted_fields[i]; 3811 fh.ChangeField(field); 3812 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3813 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3814 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 3815 continue; 3816 } 3817 fields->Set(current_field++, field); 3818 field->SetOffset(field_offset); 3819 // drop the consumed field 3820 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 3821 break; 3822 } 3823 // whether we found a 32-bit field for padding or not, we advance 3824 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3825 } 3826 3827 // Alignment is good, shuffle any double-wide fields forward, and 3828 // finish assigning field offsets to all fields. 3829 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 3830 while (!grouped_and_sorted_fields.empty()) { 3831 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3832 grouped_and_sorted_fields.pop_front(); 3833 fh.ChangeField(field); 3834 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3835 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3836 fields->Set(current_field, field); 3837 field->SetOffset(field_offset); 3838 field_offset = MemberOffset(field_offset.Uint32Value() + 3839 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 3840 ? sizeof(uint64_t) 3841 : sizeof(uint32_t))); 3842 current_field++; 3843 } 3844 3845 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 3846 if (!is_static && 3847 StringPiece(ClassHelper(klass.get(), this).GetDescriptor()) == "Ljava/lang/ref/Reference;") { 3848 // We know there are no non-reference fields in the Reference classes, and we know 3849 // that 'referent' is alphabetically last, so this is easy... 3850 CHECK_EQ(num_reference_fields, num_fields); 3851 fh.ChangeField(fields->Get(num_fields - 1)); 3852 CHECK_STREQ(fh.GetName(), "referent"); 3853 --num_reference_fields; 3854 } 3855 3856#ifndef NDEBUG 3857 // Make sure that all reference fields appear before 3858 // non-reference fields, and all double-wide fields are aligned. 3859 bool seen_non_ref = false; 3860 for (size_t i = 0; i < num_fields; i++) { 3861 mirror::ArtField* field = fields->Get(i); 3862 if (false) { // enable to debug field layout 3863 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 3864 << " class=" << PrettyClass(klass.get()) 3865 << " field=" << PrettyField(field) 3866 << " offset=" << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset()), 3867 false); 3868 } 3869 fh.ChangeField(field); 3870 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3871 bool is_primitive = type != Primitive::kPrimNot; 3872 if (StringPiece(ClassHelper(klass.get(), this).GetDescriptor()) == "Ljava/lang/ref/Reference;" && 3873 StringPiece(fh.GetName()) == "referent") { 3874 is_primitive = true; // We lied above, so we have to expect a lie here. 3875 } 3876 if (is_primitive) { 3877 if (!seen_non_ref) { 3878 seen_non_ref = true; 3879 DCHECK_EQ(num_reference_fields, i); 3880 } 3881 } else { 3882 DCHECK(!seen_non_ref); 3883 } 3884 } 3885 if (!seen_non_ref) { 3886 DCHECK_EQ(num_fields, num_reference_fields); 3887 } 3888#endif 3889 size = field_offset.Uint32Value(); 3890 // Update klass 3891 if (is_static) { 3892 klass->SetNumReferenceStaticFields(num_reference_fields); 3893 klass->SetClassSize(size); 3894 } else { 3895 klass->SetNumReferenceInstanceFields(num_reference_fields); 3896 if (!klass->IsVariableSize()) { 3897 DCHECK_GE(size, sizeof(mirror::Object)) << ClassHelper(klass.get(), this).GetDescriptor(); 3898 klass->SetObjectSize(size); 3899 } 3900 } 3901 return true; 3902} 3903 3904// Set the bitmap of reference offsets, refOffsets, from the ifields 3905// list. 3906void ClassLinker::CreateReferenceInstanceOffsets(SirtRef<mirror::Class>& klass) { 3907 uint32_t reference_offsets = 0; 3908 mirror::Class* super_class = klass->GetSuperClass(); 3909 if (super_class != NULL) { 3910 reference_offsets = super_class->GetReferenceInstanceOffsets(); 3911 // If our superclass overflowed, we don't stand a chance. 3912 if (reference_offsets == CLASS_WALK_SUPER) { 3913 klass->SetReferenceInstanceOffsets(reference_offsets); 3914 return; 3915 } 3916 } 3917 CreateReferenceOffsets(klass, false, reference_offsets); 3918} 3919 3920void ClassLinker::CreateReferenceStaticOffsets(SirtRef<mirror::Class>& klass) { 3921 CreateReferenceOffsets(klass, true, 0); 3922} 3923 3924void ClassLinker::CreateReferenceOffsets(SirtRef<mirror::Class>& klass, bool is_static, 3925 uint32_t reference_offsets) { 3926 size_t num_reference_fields = 3927 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 3928 : klass->NumReferenceInstanceFieldsDuringLinking(); 3929 const mirror::ObjectArray<mirror::ArtField>* fields = 3930 is_static ? klass->GetSFields() : klass->GetIFields(); 3931 // All of the fields that contain object references are guaranteed 3932 // to be at the beginning of the fields list. 3933 for (size_t i = 0; i < num_reference_fields; ++i) { 3934 // Note that byte_offset is the offset from the beginning of 3935 // object, not the offset into instance data 3936 const mirror::ArtField* field = fields->Get(i); 3937 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 3938 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 3939 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 3940 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 3941 CHECK_NE(new_bit, 0U); 3942 reference_offsets |= new_bit; 3943 } else { 3944 reference_offsets = CLASS_WALK_SUPER; 3945 break; 3946 } 3947 } 3948 // Update fields in klass 3949 if (is_static) { 3950 klass->SetReferenceStaticOffsets(reference_offsets); 3951 } else { 3952 klass->SetReferenceInstanceOffsets(reference_offsets); 3953 } 3954} 3955 3956mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, 3957 uint32_t string_idx, mirror::DexCache* dex_cache) { 3958 DCHECK(dex_cache != NULL); 3959 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 3960 if (resolved != NULL) { 3961 return resolved; 3962 } 3963 const DexFile::StringId& string_id = dex_file.GetStringId(string_idx); 3964 int32_t utf16_length = dex_file.GetStringLength(string_id); 3965 const char* utf8_data = dex_file.GetStringData(string_id); 3966 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 3967 dex_cache->SetResolvedString(string_idx, string); 3968 return string; 3969} 3970 3971mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, 3972 uint16_t type_idx, 3973 mirror::DexCache* dex_cache, 3974 mirror::ClassLoader* class_loader) { 3975 DCHECK(dex_cache != NULL); 3976 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 3977 if (resolved == NULL) { 3978 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 3979 resolved = FindClass(descriptor, class_loader); 3980 if (resolved != NULL) { 3981 // TODO: we used to throw here if resolved's class loader was not the 3982 // boot class loader. This was to permit different classes with the 3983 // same name to be loaded simultaneously by different loaders 3984 dex_cache->SetResolvedType(type_idx, resolved); 3985 } else { 3986 Thread* self = Thread::Current(); 3987 CHECK(self->IsExceptionPending()) 3988 << "Expected pending exception for failed resolution of: " << descriptor; 3989 // Convert a ClassNotFoundException to a NoClassDefFoundError. 3990 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 3991 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 3992 Thread::Current()->ClearException(); 3993 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 3994 self->GetException(NULL)->SetCause(cause.get()); 3995 } 3996 } 3997 } 3998 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 3999 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4000 return resolved; 4001} 4002 4003mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 4004 uint32_t method_idx, 4005 mirror::DexCache* dex_cache, 4006 mirror::ClassLoader* class_loader, 4007 const mirror::ArtMethod* referrer, 4008 InvokeType type) { 4009 DCHECK(dex_cache != NULL); 4010 // Check for hit in the dex cache. 4011 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4012 if (resolved != NULL) { 4013 return resolved; 4014 } 4015 // Fail, get the declaring class. 4016 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4017 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4018 if (klass == NULL) { 4019 DCHECK(Thread::Current()->IsExceptionPending()); 4020 return NULL; 4021 } 4022 // Scan using method_idx, this saves string compares but will only hit for matching dex 4023 // caches/files. 4024 switch (type) { 4025 case kDirect: // Fall-through. 4026 case kStatic: 4027 resolved = klass->FindDirectMethod(dex_cache, method_idx); 4028 break; 4029 case kInterface: 4030 resolved = klass->FindInterfaceMethod(dex_cache, method_idx); 4031 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4032 break; 4033 case kSuper: // Fall-through. 4034 case kVirtual: 4035 resolved = klass->FindVirtualMethod(dex_cache, method_idx); 4036 break; 4037 default: 4038 LOG(FATAL) << "Unreachable - invocation type: " << type; 4039 } 4040 if (resolved == NULL) { 4041 // Search by name, which works across dex files. 4042 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4043 std::string signature(dex_file.CreateMethodSignature(method_id.proto_idx_, NULL)); 4044 switch (type) { 4045 case kDirect: // Fall-through. 4046 case kStatic: 4047 resolved = klass->FindDirectMethod(name, signature); 4048 break; 4049 case kInterface: 4050 resolved = klass->FindInterfaceMethod(name, signature); 4051 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4052 break; 4053 case kSuper: // Fall-through. 4054 case kVirtual: 4055 resolved = klass->FindVirtualMethod(name, signature); 4056 break; 4057 } 4058 } 4059 if (resolved != NULL) { 4060 // We found a method, check for incompatible class changes. 4061 if (resolved->CheckIncompatibleClassChange(type)) { 4062 resolved = NULL; 4063 } 4064 } 4065 if (resolved != NULL) { 4066 // Be a good citizen and update the dex cache to speed subsequent calls. 4067 dex_cache->SetResolvedMethod(method_idx, resolved); 4068 return resolved; 4069 } else { 4070 // We failed to find the method which means either an access error, an incompatible class 4071 // change, or no such method. First try to find the method among direct and virtual methods. 4072 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4073 std::string signature(dex_file.CreateMethodSignature(method_id.proto_idx_, NULL)); 4074 switch (type) { 4075 case kDirect: 4076 case kStatic: 4077 resolved = klass->FindVirtualMethod(name, signature); 4078 break; 4079 case kInterface: 4080 case kVirtual: 4081 case kSuper: 4082 resolved = klass->FindDirectMethod(name, signature); 4083 break; 4084 } 4085 4086 // If we found something, check that it can be accessed by the referrer. 4087 if (resolved != NULL && referrer != NULL) { 4088 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4089 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4090 if (!referring_class->CanAccess(methods_class)) { 4091 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4092 referrer, resolved, type); 4093 return NULL; 4094 } else if (!referring_class->CanAccessMember(methods_class, 4095 resolved->GetAccessFlags())) { 4096 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4097 return NULL; 4098 } 4099 } 4100 4101 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4102 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4103 switch (type) { 4104 case kDirect: 4105 case kStatic: 4106 if (resolved != NULL) { 4107 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4108 } else { 4109 resolved = klass->FindInterfaceMethod(name, signature); 4110 if (resolved != NULL) { 4111 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4112 } else { 4113 ThrowNoSuchMethodError(type, klass, name, signature); 4114 } 4115 } 4116 break; 4117 case kInterface: 4118 if (resolved != NULL) { 4119 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4120 } else { 4121 resolved = klass->FindVirtualMethod(name, signature); 4122 if (resolved != NULL) { 4123 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4124 } else { 4125 ThrowNoSuchMethodError(type, klass, name, signature); 4126 } 4127 } 4128 break; 4129 case kSuper: 4130 ThrowNoSuchMethodError(type, klass, name, signature); 4131 break; 4132 case kVirtual: 4133 if (resolved != NULL) { 4134 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4135 } else { 4136 resolved = klass->FindInterfaceMethod(name, signature); 4137 if (resolved != NULL) { 4138 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4139 } else { 4140 ThrowNoSuchMethodError(type, klass, name, signature); 4141 } 4142 } 4143 break; 4144 } 4145 DCHECK(Thread::Current()->IsExceptionPending()); 4146 return NULL; 4147 } 4148} 4149 4150mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, 4151 uint32_t field_idx, 4152 mirror::DexCache* dex_cache, 4153 mirror::ClassLoader* class_loader, 4154 bool is_static) { 4155 DCHECK(dex_cache != NULL); 4156 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4157 if (resolved != NULL) { 4158 return resolved; 4159 } 4160 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4161 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4162 if (klass == NULL) { 4163 DCHECK(Thread::Current()->IsExceptionPending()); 4164 return NULL; 4165 } 4166 4167 if (is_static) { 4168 resolved = klass->FindStaticField(dex_cache, field_idx); 4169 } else { 4170 resolved = klass->FindInstanceField(dex_cache, field_idx); 4171 } 4172 4173 if (resolved == NULL) { 4174 const char* name = dex_file.GetFieldName(field_id); 4175 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4176 if (is_static) { 4177 resolved = klass->FindStaticField(name, type); 4178 } else { 4179 resolved = klass->FindInstanceField(name, type); 4180 } 4181 if (resolved == NULL) { 4182 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 4183 return NULL; 4184 } 4185 } 4186 dex_cache->SetResolvedField(field_idx, resolved); 4187 return resolved; 4188} 4189 4190mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4191 uint32_t field_idx, 4192 mirror::DexCache* dex_cache, 4193 mirror::ClassLoader* class_loader) { 4194 DCHECK(dex_cache != NULL); 4195 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4196 if (resolved != NULL) { 4197 return resolved; 4198 } 4199 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4200 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4201 if (klass == NULL) { 4202 DCHECK(Thread::Current()->IsExceptionPending()); 4203 return NULL; 4204 } 4205 4206 const char* name = dex_file.GetFieldName(field_id); 4207 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4208 resolved = klass->FindField(name, type); 4209 if (resolved != NULL) { 4210 dex_cache->SetResolvedField(field_idx, resolved); 4211 } else { 4212 ThrowNoSuchFieldError("", klass, type, name); 4213 } 4214 return resolved; 4215} 4216 4217const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4218 uint32_t* length) { 4219 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4220 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4221 const DexFile& dex_file = *dex_cache->GetDexFile(); 4222 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4223 return dex_file.GetMethodShorty(method_id, length); 4224} 4225 4226void ClassLinker::DumpAllClasses(int flags) { 4227 if (dex_cache_image_class_lookup_required_) { 4228 MoveImageClassesToClassTable(); 4229 } 4230 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4231 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4232 std::vector<mirror::Class*> all_classes; 4233 { 4234 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4235 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 4236 all_classes.push_back(it.second); 4237 } 4238 } 4239 4240 for (size_t i = 0; i < all_classes.size(); ++i) { 4241 all_classes[i]->DumpClass(std::cerr, flags); 4242 } 4243} 4244 4245void ClassLinker::DumpForSigQuit(std::ostream& os) { 4246 if (dex_cache_image_class_lookup_required_) { 4247 MoveImageClassesToClassTable(); 4248 } 4249 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4250 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4251} 4252 4253size_t ClassLinker::NumLoadedClasses() { 4254 if (dex_cache_image_class_lookup_required_) { 4255 MoveImageClassesToClassTable(); 4256 } 4257 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4258 return class_table_.size(); 4259} 4260 4261pid_t ClassLinker::GetClassesLockOwner() { 4262 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4263} 4264 4265pid_t ClassLinker::GetDexLockOwner() { 4266 return dex_lock_.GetExclusiveOwnerTid(); 4267} 4268 4269void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4270 DCHECK(!init_done_); 4271 4272 DCHECK(klass != NULL); 4273 DCHECK(klass->GetClassLoader() == NULL); 4274 4275 DCHECK(class_roots_ != NULL); 4276 DCHECK(class_roots_->Get(class_root) == NULL); 4277 class_roots_->Set(class_root, klass); 4278} 4279 4280} // namespace art 4281