class_linker.cc revision 90af14d2743614e3e1453984b14258a6f145501d
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 class_roots_(NULL), 191 array_iftable_(NULL), 192 init_done_(false), 193 is_dirty_(false), 194 intern_table_(intern_table), 195 portable_resolution_trampoline_(NULL), 196 quick_resolution_trampoline_(NULL) { 197 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 198} 199 200void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 201 VLOG(startup) << "ClassLinker::Init"; 202 CHECK(Runtime::Current()->IsCompiler()); 203 204 CHECK(!init_done_); 205 206 // java_lang_Class comes first, it's needed for AllocClass 207 Thread* self = Thread::Current(); 208 gc::Heap* heap = Runtime::Current()->GetHeap(); 209 SirtRef<mirror::Class> 210 java_lang_Class(self, 211 down_cast<mirror::Class*>(heap->AllocObject(self, NULL, 212 sizeof(mirror::ClassClass)))); 213 CHECK(java_lang_Class.get() != NULL); 214 mirror::Class::SetClassClass(java_lang_Class.get()); 215 java_lang_Class->SetClass(java_lang_Class.get()); 216 java_lang_Class->SetClassSize(sizeof(mirror::ClassClass)); 217 // AllocClass(mirror::Class*) can now be used 218 219 // Class[] is used for reflection support. 220 SirtRef<mirror::Class> class_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 221 class_array_class->SetComponentType(java_lang_Class.get()); 222 223 // java_lang_Object comes next so that object_array_class can be created. 224 SirtRef<mirror::Class> java_lang_Object(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 225 CHECK(java_lang_Object.get() != NULL); 226 // backfill Object as the super class of Class. 227 java_lang_Class->SetSuperClass(java_lang_Object.get()); 228 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded); 229 230 // Object[] next to hold class roots. 231 SirtRef<mirror::Class> object_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 232 object_array_class->SetComponentType(java_lang_Object.get()); 233 234 // Setup the char class to be used for char[]. 235 SirtRef<mirror::Class> char_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 236 237 // Setup the char[] class to be used for String. 238 SirtRef<mirror::Class> char_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 239 char_array_class->SetComponentType(char_class.get()); 240 mirror::CharArray::SetArrayClass(char_array_class.get()); 241 242 // Setup String. 243 SirtRef<mirror::Class> java_lang_String(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::StringClass))); 244 mirror::String::SetClass(java_lang_String.get()); 245 java_lang_String->SetObjectSize(sizeof(mirror::String)); 246 java_lang_String->SetStatus(mirror::Class::kStatusResolved); 247 248 // Create storage for root classes, save away our work so far (requires descriptors). 249 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.get(), kClassRootsMax); 250 CHECK(class_roots_ != NULL); 251 SetClassRoot(kJavaLangClass, java_lang_Class.get()); 252 SetClassRoot(kJavaLangObject, java_lang_Object.get()); 253 SetClassRoot(kClassArrayClass, class_array_class.get()); 254 SetClassRoot(kObjectArrayClass, object_array_class.get()); 255 SetClassRoot(kCharArrayClass, char_array_class.get()); 256 SetClassRoot(kJavaLangString, java_lang_String.get()); 257 258 // Setup the primitive type classes. 259 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 260 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 261 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 262 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 263 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 264 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 265 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 266 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 267 268 // Create array interface entries to populate once we can load system classes. 269 array_iftable_ = AllocIfTable(self, 2); 270 271 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 272 SirtRef<mirror::Class> int_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 273 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 274 mirror::IntArray::SetArrayClass(int_array_class.get()); 275 SetClassRoot(kIntArrayClass, int_array_class.get()); 276 277 // now that these are registered, we can use AllocClass() and AllocObjectArray 278 279 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 280 SirtRef<mirror::Class> 281 java_lang_DexCache(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::DexCacheClass))); 282 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.get()); 283 java_lang_DexCache->SetObjectSize(sizeof(mirror::DexCacheClass)); 284 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved); 285 286 // Constructor, Field, Method, and AbstractMethod are necessary so that FindClass can link members. 287 SirtRef<mirror::Class> java_lang_reflect_ArtField(self, AllocClass(self, java_lang_Class.get(), 288 sizeof(mirror::ArtFieldClass))); 289 CHECK(java_lang_reflect_ArtField.get() != NULL); 290 java_lang_reflect_ArtField->SetObjectSize(sizeof(mirror::ArtField)); 291 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.get()); 292 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved); 293 mirror::ArtField::SetClass(java_lang_reflect_ArtField.get()); 294 295 SirtRef<mirror::Class> java_lang_reflect_ArtMethod(self, AllocClass(self, java_lang_Class.get(), 296 sizeof(mirror::ArtMethodClass))); 297 CHECK(java_lang_reflect_ArtMethod.get() != NULL); 298 java_lang_reflect_ArtMethod->SetObjectSize(sizeof(mirror::ArtMethod)); 299 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.get()); 300 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved); 301 302 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.get()); 303 304 // Set up array classes for string, field, method 305 SirtRef<mirror::Class> object_array_string(self, AllocClass(self, java_lang_Class.get(), 306 sizeof(mirror::Class))); 307 object_array_string->SetComponentType(java_lang_String.get()); 308 SetClassRoot(kJavaLangStringArrayClass, object_array_string.get()); 309 310 SirtRef<mirror::Class> object_array_art_method(self, AllocClass(self, java_lang_Class.get(), 311 sizeof(mirror::Class))); 312 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.get()); 313 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.get()); 314 315 SirtRef<mirror::Class> object_array_art_field(self, AllocClass(self, java_lang_Class.get(), 316 sizeof(mirror::Class))); 317 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.get()); 318 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.get()); 319 320 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 321 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 322 // these roots. 323 CHECK_NE(0U, boot_class_path.size()); 324 for (size_t i = 0; i != boot_class_path.size(); ++i) { 325 const DexFile* dex_file = boot_class_path[i]; 326 CHECK(dex_file != NULL); 327 AppendToBootClassPath(*dex_file); 328 } 329 330 // now we can use FindSystemClass 331 332 // run char class through InitializePrimitiveClass to finish init 333 InitializePrimitiveClass(char_class.get(), Primitive::kPrimChar); 334 SetClassRoot(kPrimitiveChar, char_class.get()); // needs descriptor 335 336 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 337 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady); 338 mirror::Class* Object_class = FindSystemClass("Ljava/lang/Object;"); 339 CHECK_EQ(java_lang_Object.get(), Object_class); 340 CHECK_EQ(java_lang_Object->GetObjectSize(), sizeof(mirror::Object)); 341 java_lang_String->SetStatus(mirror::Class::kStatusNotReady); 342 mirror::Class* String_class = FindSystemClass("Ljava/lang/String;"); 343 CHECK_EQ(java_lang_String.get(), String_class); 344 CHECK_EQ(java_lang_String->GetObjectSize(), sizeof(mirror::String)); 345 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady); 346 mirror::Class* DexCache_class = FindSystemClass("Ljava/lang/DexCache;"); 347 CHECK_EQ(java_lang_String.get(), String_class); 348 CHECK_EQ(java_lang_DexCache.get(), DexCache_class); 349 CHECK_EQ(java_lang_DexCache->GetObjectSize(), sizeof(mirror::DexCache)); 350 351 // Setup the primitive array type classes - can't be done until Object has a vtable. 352 SetClassRoot(kBooleanArrayClass, FindSystemClass("[Z")); 353 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 354 355 SetClassRoot(kByteArrayClass, FindSystemClass("[B")); 356 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 357 358 mirror::Class* found_char_array_class = FindSystemClass("[C"); 359 CHECK_EQ(char_array_class.get(), found_char_array_class); 360 361 SetClassRoot(kShortArrayClass, FindSystemClass("[S")); 362 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 363 364 mirror::Class* found_int_array_class = FindSystemClass("[I"); 365 CHECK_EQ(int_array_class.get(), found_int_array_class); 366 367 SetClassRoot(kLongArrayClass, FindSystemClass("[J")); 368 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 369 370 SetClassRoot(kFloatArrayClass, FindSystemClass("[F")); 371 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 372 373 SetClassRoot(kDoubleArrayClass, FindSystemClass("[D")); 374 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 375 376 mirror::Class* found_class_array_class = FindSystemClass("[Ljava/lang/Class;"); 377 CHECK_EQ(class_array_class.get(), found_class_array_class); 378 379 mirror::Class* found_object_array_class = FindSystemClass("[Ljava/lang/Object;"); 380 CHECK_EQ(object_array_class.get(), found_object_array_class); 381 382 // Setup the single, global copy of "iftable". 383 mirror::Class* java_lang_Cloneable = FindSystemClass("Ljava/lang/Cloneable;"); 384 CHECK(java_lang_Cloneable != NULL); 385 mirror::Class* java_io_Serializable = FindSystemClass("Ljava/io/Serializable;"); 386 CHECK(java_io_Serializable != NULL); 387 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 388 // crawl up and explicitly list all of the supers as well. 389 array_iftable_->SetInterface(0, java_lang_Cloneable); 390 array_iftable_->SetInterface(1, java_io_Serializable); 391 392 // Sanity check Class[] and Object[]'s interfaces. 393 ClassHelper kh(class_array_class.get(), this); 394 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 395 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 396 kh.ChangeClass(object_array_class.get()); 397 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 398 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 399 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 400 // dex_cache_ fields and register them in classes_. 401 mirror::Class* Class_class = FindSystemClass("Ljava/lang/Class;"); 402 CHECK_EQ(java_lang_Class.get(), Class_class); 403 404 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady); 405 mirror::Class* Art_method_class = FindSystemClass("Ljava/lang/reflect/ArtMethod;"); 406 CHECK_EQ(java_lang_reflect_ArtMethod.get(), Art_method_class); 407 408 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady); 409 mirror::Class* Art_field_class = FindSystemClass("Ljava/lang/reflect/ArtField;"); 410 CHECK_EQ(java_lang_reflect_ArtField.get(), Art_field_class); 411 412 mirror::Class* String_array_class = FindSystemClass(class_roots_descriptors_[kJavaLangStringArrayClass]); 413 CHECK_EQ(object_array_string.get(), String_array_class); 414 415 mirror::Class* Art_method_array_class = 416 FindSystemClass(class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 417 CHECK_EQ(object_array_art_method.get(), Art_method_array_class); 418 419 mirror::Class* Art_field_array_class = 420 FindSystemClass(class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 421 CHECK_EQ(object_array_art_field.get(), Art_field_array_class); 422 423 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 424 425 // Create java.lang.reflect.Proxy root. 426 mirror::Class* java_lang_reflect_Proxy = FindSystemClass("Ljava/lang/reflect/Proxy;"); 427 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 428 429 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 430 mirror::Class* java_lang_ref_Reference = FindSystemClass("Ljava/lang/ref/Reference;"); 431 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference); 432 mirror::Class* java_lang_ref_FinalizerReference = FindSystemClass("Ljava/lang/ref/FinalizerReference;"); 433 java_lang_ref_FinalizerReference->SetAccessFlags( 434 java_lang_ref_FinalizerReference->GetAccessFlags() | 435 kAccClassIsReference | kAccClassIsFinalizerReference); 436 mirror::Class* java_lang_ref_PhantomReference = FindSystemClass("Ljava/lang/ref/PhantomReference;"); 437 java_lang_ref_PhantomReference->SetAccessFlags( 438 java_lang_ref_PhantomReference->GetAccessFlags() | 439 kAccClassIsReference | kAccClassIsPhantomReference); 440 mirror::Class* java_lang_ref_SoftReference = FindSystemClass("Ljava/lang/ref/SoftReference;"); 441 java_lang_ref_SoftReference->SetAccessFlags( 442 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 443 mirror::Class* java_lang_ref_WeakReference = FindSystemClass("Ljava/lang/ref/WeakReference;"); 444 java_lang_ref_WeakReference->SetAccessFlags( 445 java_lang_ref_WeakReference->GetAccessFlags() | 446 kAccClassIsReference | kAccClassIsWeakReference); 447 448 // Setup the ClassLoader, verifying the object_size_. 449 mirror::Class* java_lang_ClassLoader = FindSystemClass("Ljava/lang/ClassLoader;"); 450 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), sizeof(mirror::ClassLoader)); 451 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 452 453 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 454 // java.lang.StackTraceElement as a convenience. 455 SetClassRoot(kJavaLangThrowable, FindSystemClass("Ljava/lang/Throwable;")); 456 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 457 SetClassRoot(kJavaLangClassNotFoundException, FindSystemClass("Ljava/lang/ClassNotFoundException;")); 458 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass("Ljava/lang/StackTraceElement;")); 459 SetClassRoot(kJavaLangStackTraceElementArrayClass, FindSystemClass("[Ljava/lang/StackTraceElement;")); 460 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 461 462 FinishInit(); 463 464 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 465} 466 467void ClassLinker::FinishInit() { 468 VLOG(startup) << "ClassLinker::FinishInit entering"; 469 470 // Let the heap know some key offsets into java.lang.ref instances 471 // Note: we hard code the field indexes here rather than using FindInstanceField 472 // as the types of the field can't be resolved prior to the runtime being 473 // fully initialized 474 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 475 mirror::Class* java_lang_ref_ReferenceQueue = FindSystemClass("Ljava/lang/ref/ReferenceQueue;"); 476 mirror::Class* java_lang_ref_FinalizerReference = FindSystemClass("Ljava/lang/ref/FinalizerReference;"); 477 478 const DexFile& java_lang_dex = *java_lang_ref_Reference->GetDexCache()->GetDexFile(); 479 480 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 481 FieldHelper fh(pendingNext, this); 482 CHECK_STREQ(fh.GetName(), "pendingNext"); 483 CHECK_EQ(java_lang_dex.GetFieldId(pendingNext->GetDexFieldIndex()).type_idx_, 484 java_lang_ref_Reference->GetDexTypeIndex()); 485 486 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 487 fh.ChangeField(queue); 488 CHECK_STREQ(fh.GetName(), "queue"); 489 CHECK_EQ(java_lang_dex.GetFieldId(queue->GetDexFieldIndex()).type_idx_, 490 java_lang_ref_ReferenceQueue->GetDexTypeIndex()); 491 492 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 493 fh.ChangeField(queueNext); 494 CHECK_STREQ(fh.GetName(), "queueNext"); 495 CHECK_EQ(java_lang_dex.GetFieldId(queueNext->GetDexFieldIndex()).type_idx_, 496 java_lang_ref_Reference->GetDexTypeIndex()); 497 498 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 499 fh.ChangeField(referent); 500 CHECK_STREQ(fh.GetName(), "referent"); 501 CHECK_EQ(java_lang_dex.GetFieldId(referent->GetDexFieldIndex()).type_idx_, 502 GetClassRoot(kJavaLangObject)->GetDexTypeIndex()); 503 504 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 505 fh.ChangeField(zombie); 506 CHECK_STREQ(fh.GetName(), "zombie"); 507 CHECK_EQ(java_lang_dex.GetFieldId(zombie->GetDexFieldIndex()).type_idx_, 508 GetClassRoot(kJavaLangObject)->GetDexTypeIndex()); 509 510 gc::Heap* heap = Runtime::Current()->GetHeap(); 511 heap->SetReferenceOffsets(referent->GetOffset(), 512 queue->GetOffset(), 513 queueNext->GetOffset(), 514 pendingNext->GetOffset(), 515 zombie->GetOffset()); 516 517 // ensure all class_roots_ are initialized 518 for (size_t i = 0; i < kClassRootsMax; i++) { 519 ClassRoot class_root = static_cast<ClassRoot>(i); 520 mirror::Class* klass = GetClassRoot(class_root); 521 CHECK(klass != NULL); 522 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 523 // note SetClassRoot does additional validation. 524 // if possible add new checks there to catch errors early 525 } 526 527 CHECK(array_iftable_ != NULL); 528 529 // disable the slow paths in FindClass and CreatePrimitiveClass now 530 // that Object, Class, and Object[] are setup 531 init_done_ = true; 532 533 VLOG(startup) << "ClassLinker::FinishInit exiting"; 534} 535 536void ClassLinker::RunRootClinits() { 537 Thread* self = Thread::Current(); 538 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 539 mirror::Class* c = GetClassRoot(ClassRoot(i)); 540 if (!c->IsArrayClass() && !c->IsPrimitive()) { 541 EnsureInitialized(GetClassRoot(ClassRoot(i)), true, true); 542 self->AssertNoPendingException(); 543 } 544 } 545} 546 547bool ClassLinker::GenerateOatFile(const std::string& dex_filename, 548 int oat_fd, 549 const std::string& oat_cache_filename) { 550 std::string dex2oat_string(GetAndroidRoot()); 551 dex2oat_string += (kIsDebugBuild ? "/bin/dex2oatd" : "/bin/dex2oat"); 552 const char* dex2oat = dex2oat_string.c_str(); 553 554 const char* class_path = Runtime::Current()->GetClassPathString().c_str(); 555 556 gc::Heap* heap = Runtime::Current()->GetHeap(); 557 std::string boot_image_option_string("--boot-image="); 558 boot_image_option_string += heap->GetImageSpace()->GetImageFilename(); 559 const char* boot_image_option = boot_image_option_string.c_str(); 560 561 std::string dex_file_option_string("--dex-file="); 562 dex_file_option_string += dex_filename; 563 const char* dex_file_option = dex_file_option_string.c_str(); 564 565 std::string oat_fd_option_string("--oat-fd="); 566 StringAppendF(&oat_fd_option_string, "%d", oat_fd); 567 const char* oat_fd_option = oat_fd_option_string.c_str(); 568 569 std::string oat_location_option_string("--oat-location="); 570 oat_location_option_string += oat_cache_filename; 571 const char* oat_location_option = oat_location_option_string.c_str(); 572 573 std::string oat_compiler_filter_string("-compiler-filter:"); 574 switch (Runtime::Current()->GetCompilerFilter()) { 575 case Runtime::kInterpretOnly: 576 oat_compiler_filter_string += "interpret-only"; 577 break; 578 case Runtime::kDeferCompilation: 579 oat_compiler_filter_string += "defer-compilation"; 580 break; 581 case Runtime::kSpace: 582 oat_compiler_filter_string += "space"; 583 break; 584 case Runtime::kBalanced: 585 oat_compiler_filter_string += "balanced"; 586 break; 587 case Runtime::kSpeed: 588 oat_compiler_filter_string += "speed"; 589 break; 590 default: 591 LOG(FATAL) << "Unexpected case."; 592 } 593 const char* oat_compiler_filter_option = oat_compiler_filter_string.c_str(); 594 595 // fork and exec dex2oat 596 pid_t pid = fork(); 597 if (pid == 0) { 598 // no allocation allowed between fork and exec 599 600 // change process groups, so we don't get reaped by ProcessManager 601 setpgid(0, 0); 602 603 VLOG(class_linker) << dex2oat 604 << " --runtime-arg -Xms64m" 605 << " --runtime-arg -Xmx64m" 606 << " --runtime-arg -classpath" 607 << " --runtime-arg " << class_path 608 << " --runtime-arg " << oat_compiler_filter_option 609#if !defined(ART_TARGET) 610 << " --host" 611#endif 612 << " " << boot_image_option 613 << " " << dex_file_option 614 << " " << oat_fd_option 615 << " " << oat_location_option; 616 617 execl(dex2oat, dex2oat, 618 "--runtime-arg", "-Xms64m", 619 "--runtime-arg", "-Xmx64m", 620 "--runtime-arg", "-classpath", 621 "--runtime-arg", class_path, 622 "--runtime-arg", oat_compiler_filter_option, 623#if !defined(ART_TARGET) 624 "--host", 625#endif 626 boot_image_option, 627 dex_file_option, 628 oat_fd_option, 629 oat_location_option, 630 NULL); 631 632 PLOG(FATAL) << "execl(" << dex2oat << ") failed"; 633 return false; 634 } else { 635 // wait for dex2oat to finish 636 int status; 637 pid_t got_pid = TEMP_FAILURE_RETRY(waitpid(pid, &status, 0)); 638 if (got_pid != pid) { 639 PLOG(ERROR) << "waitpid failed: wanted " << pid << ", got " << got_pid; 640 return false; 641 } 642 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { 643 LOG(ERROR) << dex2oat << " failed with dex-file=" << dex_filename; 644 return false; 645 } 646 } 647 return true; 648} 649 650void ClassLinker::RegisterOatFile(const OatFile& oat_file) { 651 WriterMutexLock mu(Thread::Current(), dex_lock_); 652 RegisterOatFileLocked(oat_file); 653} 654 655void ClassLinker::RegisterOatFileLocked(const OatFile& oat_file) { 656 dex_lock_.AssertExclusiveHeld(Thread::Current()); 657 if (kIsDebugBuild) { 658 for (size_t i = 0; i < oat_files_.size(); ++i) { 659 CHECK_NE(&oat_file, oat_files_[i]) << oat_file.GetLocation(); 660 } 661 } 662 VLOG(class_linker) << "Registering " << oat_file.GetLocation(); 663 oat_files_.push_back(&oat_file); 664} 665 666OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 667 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 668 OatFile& oat_file = space->ReleaseOatFile(); 669 WriterMutexLock mu(Thread::Current(), dex_lock_); 670 RegisterOatFileLocked(oat_file); 671 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 672 return oat_file; 673} 674 675const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 676 ReaderMutexLock mu(Thread::Current(), dex_lock_); 677 return FindOpenedOatFileFromDexLocation(dex_file.GetLocation()); 678} 679 680const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation(const std::string& dex_location) { 681 for (size_t i = 0; i < oat_files_.size(); i++) { 682 const OatFile* oat_file = oat_files_[i]; 683 DCHECK(oat_file != NULL); 684 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 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); 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 const std::string& oat_location) { 739 WriterMutexLock mu(Thread::Current(), dex_lock_); 740 return FindOrCreateOatFileForDexLocationLocked(dex_location, oat_location); 741} 742 743class ScopedFlock { 744 public: 745 ScopedFlock() {} 746 747 bool Init(const std::string& filename) { 748 while (true) { 749 file_.reset(OS::OpenFileWithFlags(filename.c_str(), O_CREAT | O_RDWR)); 750 if (file_.get() == NULL) { 751 LOG(ERROR) << "Failed to open file: " << filename; 752 return false; 753 } 754 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_EX)); 755 if (flock_result != 0) { 756 PLOG(ERROR) << "Failed to lock file: " << filename; 757 return false; 758 } 759 struct stat fstat_stat; 760 int fstat_result = TEMP_FAILURE_RETRY(fstat(file_->Fd(), &fstat_stat)); 761 if (fstat_result != 0) { 762 PLOG(ERROR) << "Failed to fstat: " << filename; 763 return false; 764 } 765 struct stat stat_stat; 766 int stat_result = TEMP_FAILURE_RETRY(stat(filename.c_str(), &stat_stat)); 767 if (stat_result != 0) { 768 PLOG(WARNING) << "Failed to stat, will retry: " << filename; 769 // ENOENT can happen if someone racing with us unlinks the file we created so just retry. 770 continue; 771 } 772 if (fstat_stat.st_dev != stat_stat.st_dev || fstat_stat.st_ino != stat_stat.st_ino) { 773 LOG(WARNING) << "File changed while locking, will retry: " << filename; 774 continue; 775 } 776 return true; 777 } 778 } 779 780 File& GetFile() { 781 return *file_; 782 } 783 784 ~ScopedFlock() { 785 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_UN)); 786 CHECK_EQ(0, flock_result); 787 } 788 789 private: 790 UniquePtr<File> file_; 791 792 DISALLOW_COPY_AND_ASSIGN(ScopedFlock); 793}; 794 795const DexFile* ClassLinker::FindOrCreateOatFileForDexLocationLocked(const std::string& dex_location, 796 const std::string& oat_location) { 797 uint32_t dex_location_checksum; 798 if (!DexFile::GetChecksum(dex_location, dex_location_checksum)) { 799 LOG(ERROR) << "Failed to compute checksum '" << dex_location << "'"; 800 return NULL; 801 } 802 803 // We play a locking game here so that if two different processes 804 // race to generate (or worse, one tries to open a partial generated 805 // file) we will be okay. This is actually common with apps that use 806 // DexClassLoader to work around the dex method reference limit and 807 // that have a background service running in a separate process. 808 ScopedFlock scoped_flock; 809 if (!scoped_flock.Init(oat_location)) { 810 LOG(ERROR) << "Failed to open locked oat file: " << oat_location; 811 return NULL; 812 } 813 814 // Check if we already have an up-to-date output file 815 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, 816 dex_location_checksum, 817 oat_location); 818 if (dex_file != NULL) { 819 return dex_file; 820 } 821 822 // Generate the output oat file for the dex file 823 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 824 if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location)) { 825 LOG(ERROR) << "Failed to generate oat file: " << oat_location; 826 return NULL; 827 } 828 const OatFile* oat_file = OatFile::Open(oat_location, oat_location, NULL, 829 !Runtime::Current()->IsCompiler()); 830 if (oat_file == NULL) { 831 LOG(ERROR) << "Failed to open generated oat file: " << oat_location; 832 return NULL; 833 } 834 RegisterOatFileLocked(*oat_file); 835 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location); 836 if (oat_dex_file == NULL) { 837 LOG(ERROR) << "Failed to find dex file in generated oat file: " << oat_location; 838 return NULL; 839 } 840 return oat_dex_file->OpenDexFile(); 841} 842 843bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 844 const std::string& dex_location, 845 uint32_t dex_location_checksum) { 846 Runtime* runtime = Runtime::Current(); 847 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 848 uint32_t image_oat_checksum = image_header.GetOatChecksum(); 849 uint32_t image_oat_data_begin = reinterpret_cast<uint32_t>(image_header.GetOatDataBegin()); 850 bool image_check = ((oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum) 851 && (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 852 853 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location); 854 if (oat_dex_file == NULL) { 855 LOG(ERROR) << "oat file " << oat_file->GetLocation() 856 << " does not contain contents for " << dex_location; 857 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 858 for (size_t i = 0; i < oat_dex_files.size(); i++) { 859 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 860 LOG(ERROR) << "oat file " << oat_file->GetLocation() 861 << " contains contents for " << oat_dex_file->GetDexFileLocation(); 862 } 863 return false; 864 } 865 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 866 867 if (image_check && dex_check) { 868 return true; 869 } 870 871 if (!image_check) { 872 std::string image_file(image_header.GetImageRoot( 873 ImageHeader::kOatLocation)->AsString()->ToModifiedUtf8()); 874 LOG(WARNING) << "oat file " << oat_file->GetLocation() 875 << " mismatch ( " << std::hex << oat_file->GetOatHeader().GetImageFileLocationOatChecksum() 876 << ", " << oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() 877 << ") with " << image_file 878 << " (" << image_oat_checksum << ", " << std::hex << image_oat_data_begin << ")"; 879 } 880 if (!dex_check) { 881 LOG(WARNING) << "oat file " << oat_file->GetLocation() 882 << " mismatch ( " << std::hex << oat_dex_file->GetDexFileLocationChecksum() 883 << ") with " << dex_location 884 << " (" << std::hex << dex_location_checksum << ")"; 885 } 886 return false; 887} 888 889const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const OatFile* oat_file, 890 const std::string& dex_location, 891 uint32_t dex_location_checksum) { 892 bool verified = VerifyOatFileChecksums(oat_file, dex_location, dex_location_checksum); 893 if (!verified) { 894 return NULL; 895 } 896 RegisterOatFileLocked(*oat_file); 897 return oat_file->GetOatDexFile(dex_location)->OpenDexFile(); 898} 899 900const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const std::string& dex_location) { 901 WriterMutexLock mu(Thread::Current(), dex_lock_); 902 903 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location); 904 if (open_oat_file != NULL) { 905 return open_oat_file->GetOatDexFile(dex_location)->OpenDexFile(); 906 } 907 908 // Look for an existing file next to dex. for example, for 909 // /foo/bar/baz.jar, look for /foo/bar/baz.odex. 910 std::string odex_filename(OatFile::DexFilenameToOdexFilename(dex_location)); 911 const OatFile* oat_file = FindOatFileFromOatLocationLocked(odex_filename); 912 if (oat_file != NULL) { 913 uint32_t dex_location_checksum; 914 if (!DexFile::GetChecksum(dex_location, dex_location_checksum)) { 915 // If no classes.dex found in dex_location, it has been stripped, assume oat is up-to-date. 916 // This is the common case in user builds for jar's and apk's in the /system directory. 917 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location); 918 CHECK(oat_dex_file != NULL) << odex_filename << " " << dex_location; 919 RegisterOatFileLocked(*oat_file); 920 return oat_dex_file->OpenDexFile(); 921 } 922 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(oat_file, 923 dex_location, 924 dex_location_checksum); 925 if (dex_file != NULL) { 926 return dex_file; 927 } 928 } 929 // Look for an existing file in the dalvik-cache, validating the result if found 930 // not found in /foo/bar/baz.odex? try /data/dalvik-cache/foo@bar@baz.jar@classes.dex 931 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location)); 932 oat_file = FindOatFileFromOatLocationLocked(cache_location); 933 if (oat_file != NULL) { 934 uint32_t dex_location_checksum; 935 if (!DexFile::GetChecksum(dex_location, dex_location_checksum)) { 936 LOG(WARNING) << "Failed to compute checksum: " << dex_location; 937 return NULL; 938 } 939 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(oat_file, 940 dex_location, 941 dex_location_checksum); 942 if (dex_file != NULL) { 943 return dex_file; 944 } 945 if (TEMP_FAILURE_RETRY(unlink(oat_file->GetLocation().c_str())) != 0) { 946 PLOG(FATAL) << "Failed to remove obsolete oat file " << oat_file->GetLocation(); 947 } 948 } 949 LOG(INFO) << "Failed to open oat file from " << odex_filename << " or " << cache_location << "."; 950 951 // Try to generate oat file if it wasn't found or was obsolete. 952 std::string oat_cache_filename(GetDalvikCacheFilenameOrDie(dex_location)); 953 return FindOrCreateOatFileForDexLocationLocked(dex_location, oat_cache_filename); 954} 955 956const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 957 for (size_t i = 0; i < oat_files_.size(); i++) { 958 const OatFile* oat_file = oat_files_[i]; 959 DCHECK(oat_file != NULL); 960 if (oat_file->GetLocation() == oat_location) { 961 return oat_file; 962 } 963 } 964 return NULL; 965} 966 967const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location) { 968 ReaderMutexLock mu(Thread::Current(), dex_lock_); 969 return FindOatFileFromOatLocationLocked(oat_location); 970} 971 972const OatFile* ClassLinker::FindOatFileFromOatLocationLocked(const std::string& oat_location) { 973 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 974 if (oat_file != NULL) { 975 return oat_file; 976 } 977 978 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler()); 979 if (oat_file == NULL) { 980 return NULL; 981 } 982 return oat_file; 983} 984 985static void InitFromImageCallbackCommon(mirror::Object* obj, ClassLinker* class_linker, 986 bool interpret_only_mode) 987 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 988 DCHECK(obj != NULL); 989 DCHECK(class_linker != NULL); 990 991 if (obj->GetClass()->IsStringClass()) { 992 class_linker->GetInternTable()->RegisterStrong(obj->AsString()); 993 } else if (obj->IsClass()) { 994 // Restore class to ClassLinker::classes_ table. 995 mirror::Class* klass = obj->AsClass(); 996 ClassHelper kh(klass, class_linker); 997 mirror::Class* existing = class_linker->InsertClass(kh.GetDescriptor(), klass, true); 998 DCHECK(existing == NULL) << kh.GetDescriptor(); 999 } else if (interpret_only_mode && obj->IsArtMethod()) { 1000 mirror::ArtMethod* method = obj->AsArtMethod(); 1001 if (!method->IsNative()) { 1002 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1003 if (method != Runtime::Current()->GetResolutionMethod()) { 1004 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1005 } 1006 } 1007 } 1008} 1009 1010static void InitFromImageCallback(mirror::Object* obj, void* arg) 1011 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1012 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1013 InitFromImageCallbackCommon(obj, class_linker, false); 1014} 1015 1016static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1017 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1018 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1019 InitFromImageCallbackCommon(obj, class_linker, true); 1020} 1021 1022void ClassLinker::InitFromImage() { 1023 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1024 CHECK(!init_done_); 1025 1026 gc::Heap* heap = Runtime::Current()->GetHeap(); 1027 gc::space::ImageSpace* space = heap->GetImageSpace(); 1028 CHECK(space != NULL); 1029 OatFile& oat_file = GetImageOatFile(space); 1030 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1031 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1032 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 1033 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1034 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1035 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1036 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1037 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1038 1039 mirror::ObjectArray<mirror::Class>* class_roots = 1040 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>(); 1041 class_roots_ = class_roots; 1042 1043 // Special case of setting up the String class early so that we can test arbitrary objects 1044 // as being Strings or not 1045 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1046 1047 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1048 static_cast<uint32_t>(dex_caches->GetLength())); 1049 Thread* self = Thread::Current(); 1050 for (int i = 0; i < dex_caches->GetLength(); i++) { 1051 SirtRef<mirror::DexCache> dex_cache(self, dex_caches->Get(i)); 1052 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1053 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location); 1054 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1055 const DexFile* dex_file = oat_dex_file->OpenDexFile(); 1056 if (dex_file == NULL) { 1057 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1058 << " from within oat file " << oat_file.GetLocation(); 1059 } 1060 1061 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1062 1063 AppendToBootClassPath(*dex_file, dex_cache); 1064 } 1065 1066 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1067 // bitmap walk. 1068 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1069 1070 // reinit clases_ table 1071 { 1072 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1073 heap->FlushAllocStack(); 1074 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1075 heap->GetLiveBitmap()->Walk(InitFromImageInterpretOnlyCallback, this); 1076 } else { 1077 heap->GetLiveBitmap()->Walk(InitFromImageCallback, this); 1078 } 1079 } 1080 1081 // reinit class_roots_ 1082 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1083 class_roots_ = class_roots; 1084 1085 // reinit array_iftable_ from any array class instance, they should be == 1086 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1087 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1088 // String class root was set above 1089 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1090 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1091 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1092 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1093 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1094 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1095 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1096 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1097 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1098 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1099 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1100 1101 FinishInit(); 1102 1103 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1104} 1105 1106// Keep in sync with InitCallback. Anything we visit, we need to 1107// reinit references to when reinitializing a ClassLinker from a 1108// mapped image. 1109void ClassLinker::VisitRoots(RootVisitor* visitor, void* arg, bool clean_dirty) { 1110 visitor(class_roots_, arg); 1111 Thread* self = Thread::Current(); 1112 { 1113 ReaderMutexLock mu(self, dex_lock_); 1114 for (size_t i = 0; i < dex_caches_.size(); i++) { 1115 visitor(dex_caches_[i], arg); 1116 } 1117 } 1118 1119 { 1120 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 1121 typedef Table::const_iterator It; // TODO: C++0x auto 1122 for (It it = classes_.begin(), end = classes_.end(); it != end; ++it) { 1123 visitor(it->second, arg); 1124 } 1125 1126 // We deliberately ignore the class roots in the image since we 1127 // handle image roots by using the MS/CMS rescanning of dirty cards. 1128 } 1129 1130 visitor(array_iftable_, arg); 1131 if (clean_dirty) { 1132 is_dirty_ = false; 1133 } 1134} 1135 1136void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) const { 1137 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1138 typedef Table::const_iterator It; // TODO: C++0x auto 1139 for (It it = classes_.begin(), end = classes_.end(); it != end; ++it) { 1140 if (!visitor(it->second, arg)) { 1141 return; 1142 } 1143 } 1144 for (It it = image_classes_.begin(), end = image_classes_.end(); it != end; ++it) { 1145 if (!visitor(it->second, arg)) { 1146 return; 1147 } 1148 } 1149} 1150 1151static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1152 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1153 classes->insert(c); 1154 return true; 1155} 1156 1157void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) const { 1158 std::set<mirror::Class*> classes; 1159 VisitClasses(GetClassesVisitor, &classes); 1160 typedef std::set<mirror::Class*>::const_iterator It; // TODO: C++0x auto 1161 for (It it = classes.begin(), end = classes.end(); it != end; ++it) { 1162 if (!visitor(*it, arg)) { 1163 return; 1164 } 1165 } 1166} 1167 1168 1169ClassLinker::~ClassLinker() { 1170 mirror::Class::ResetClass(); 1171 mirror::String::ResetClass(); 1172 mirror::ArtField::ResetClass(); 1173 mirror::ArtMethod::ResetClass(); 1174 mirror::BooleanArray::ResetArrayClass(); 1175 mirror::ByteArray::ResetArrayClass(); 1176 mirror::CharArray::ResetArrayClass(); 1177 mirror::DoubleArray::ResetArrayClass(); 1178 mirror::FloatArray::ResetArrayClass(); 1179 mirror::IntArray::ResetArrayClass(); 1180 mirror::LongArray::ResetArrayClass(); 1181 mirror::ShortArray::ResetArrayClass(); 1182 mirror::Throwable::ResetClass(); 1183 mirror::StackTraceElement::ResetClass(); 1184 STLDeleteElements(&boot_class_path_); 1185 STLDeleteElements(&oat_files_); 1186} 1187 1188mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1189 gc::Heap* heap = Runtime::Current()->GetHeap(); 1190 mirror::Class* dex_cache_class = GetClassRoot(kJavaLangDexCache); 1191 SirtRef<mirror::DexCache> dex_cache(self, 1192 down_cast<mirror::DexCache*>(heap->AllocObject(self, dex_cache_class, 1193 dex_cache_class->GetObjectSize()))); 1194 if (dex_cache.get() == NULL) { 1195 return NULL; 1196 } 1197 SirtRef<mirror::String> 1198 location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str())); 1199 if (location.get() == NULL) { 1200 return NULL; 1201 } 1202 SirtRef<mirror::ObjectArray<mirror::String> > 1203 strings(self, AllocStringArray(self, dex_file.NumStringIds())); 1204 if (strings.get() == NULL) { 1205 return NULL; 1206 } 1207 SirtRef<mirror::ObjectArray<mirror::Class> > 1208 types(self, AllocClassArray(self, dex_file.NumTypeIds())); 1209 if (types.get() == NULL) { 1210 return NULL; 1211 } 1212 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 1213 methods(self, AllocArtMethodArray(self, dex_file.NumMethodIds())); 1214 if (methods.get() == NULL) { 1215 return NULL; 1216 } 1217 SirtRef<mirror::ObjectArray<mirror::ArtField> > 1218 fields(self, AllocArtFieldArray(self, dex_file.NumFieldIds())); 1219 if (fields.get() == NULL) { 1220 return NULL; 1221 } 1222 SirtRef<mirror::ObjectArray<mirror::StaticStorageBase> > 1223 initialized_static_storage(self, 1224 AllocObjectArray<mirror::StaticStorageBase>(self, dex_file.NumTypeIds())); 1225 if (initialized_static_storage.get() == NULL) { 1226 return NULL; 1227 } 1228 1229 dex_cache->Init(&dex_file, 1230 location.get(), 1231 strings.get(), 1232 types.get(), 1233 methods.get(), 1234 fields.get(), 1235 initialized_static_storage.get()); 1236 return dex_cache.get(); 1237} 1238 1239mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1240 size_t class_size) { 1241 DCHECK_GE(class_size, sizeof(mirror::Class)); 1242 gc::Heap* heap = Runtime::Current()->GetHeap(); 1243 SirtRef<mirror::Class> klass(self, 1244 heap->AllocObject(self, java_lang_Class, class_size)->AsClass()); 1245 klass->SetPrimitiveType(Primitive::kPrimNot); // default to not being primitive 1246 klass->SetClassSize(class_size); 1247 return klass.get(); 1248} 1249 1250mirror::Class* ClassLinker::AllocClass(Thread* self, size_t class_size) { 1251 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1252} 1253 1254mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1255 return down_cast<mirror::ArtField*>(GetClassRoot(kJavaLangReflectArtField)->AllocObject(self)); 1256} 1257 1258mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1259 return down_cast<mirror::ArtMethod*>(GetClassRoot(kJavaLangReflectArtMethod)->AllocObject(self)); 1260} 1261 1262mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray(Thread* self, 1263 size_t length) { 1264 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc(self, 1265 GetClassRoot(kJavaLangStackTraceElementArrayClass), 1266 length); 1267} 1268 1269static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1270 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1271 DCHECK(klass != NULL); 1272 // Wait for the class if it has not already been linked. 1273 if (!klass->IsResolved() && !klass->IsErroneous()) { 1274 ObjectLock lock(self, klass); 1275 // Check for circular dependencies between classes. 1276 if (!klass->IsResolved() && klass->GetClinitThreadId() == self->GetTid()) { 1277 ThrowClassCircularityError(klass); 1278 klass->SetStatus(mirror::Class::kStatusError); 1279 return NULL; 1280 } 1281 // Wait for the pending initialization to complete. 1282 while (!klass->IsResolved() && !klass->IsErroneous()) { 1283 lock.WaitIgnoringInterrupts(); 1284 } 1285 } 1286 if (klass->IsErroneous()) { 1287 ThrowEarlierClassFailure(klass); 1288 return NULL; 1289 } 1290 // Return the loaded class. No exceptions should be pending. 1291 CHECK(klass->IsResolved()) << PrettyClass(klass); 1292 self->AssertNoPendingException(); 1293 return klass; 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 1327 mirror::Class* system_class = FindSystemClass(descriptor); 1328 if (system_class != NULL) { 1329 return system_class; 1330 } 1331 CHECK(self->IsExceptionPending()); 1332 self->ClearException(); 1333 1334 // next try the compile time class path 1335 const std::vector<const DexFile*>* class_path; 1336 { 1337 ScopedObjectAccessUnchecked soa(Thread::Current()); 1338 ScopedLocalRef<jobject> jclass_loader(soa.Env(), soa.AddLocalReference<jobject>(class_loader)); 1339 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1340 } 1341 1342 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1343 if (pair.second != NULL) { 1344 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1345 } 1346 1347 } else { 1348 ScopedObjectAccessUnchecked soa(self->GetJniEnv()); 1349 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1350 soa.AddLocalReference<jobject>(class_loader)); 1351 std::string class_name_string(DescriptorToDot(descriptor)); 1352 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1353 { 1354 ScopedThreadStateChange tsc(self, kNative); 1355 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1356 soa.Env()->NewStringUTF(class_name_string.c_str())); 1357 if (class_name_object.get() == NULL) { 1358 return NULL; 1359 } 1360 CHECK(class_loader_object.get() != NULL); 1361 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1362 WellKnownClasses::java_lang_ClassLoader_loadClass, 1363 class_name_object.get())); 1364 } 1365 if (soa.Self()->IsExceptionPending()) { 1366 // If the ClassLoader threw, pass that exception up. 1367 return NULL; 1368 } else if (result.get() == NULL) { 1369 // broken loader - throw NPE to be compatible with Dalvik 1370 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1371 class_name_string.c_str()).c_str()); 1372 return NULL; 1373 } else { 1374 // success, return mirror::Class* 1375 return soa.Decode<mirror::Class*>(result.get()); 1376 } 1377 } 1378 1379 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1380 return NULL; 1381} 1382 1383mirror::Class* ClassLinker::DefineClass(const StringPiece& descriptor, 1384 mirror::ClassLoader* class_loader, 1385 const DexFile& dex_file, 1386 const DexFile::ClassDef& dex_class_def) { 1387 Thread* self = Thread::Current(); 1388 SirtRef<mirror::Class> klass(self, NULL); 1389 // Load the class from the dex file. 1390 if (!init_done_) { 1391 // finish up init of hand crafted class_roots_ 1392 if (descriptor == "Ljava/lang/Object;") { 1393 klass.reset(GetClassRoot(kJavaLangObject)); 1394 } else if (descriptor == "Ljava/lang/Class;") { 1395 klass.reset(GetClassRoot(kJavaLangClass)); 1396 } else if (descriptor == "Ljava/lang/String;") { 1397 klass.reset(GetClassRoot(kJavaLangString)); 1398 } else if (descriptor == "Ljava/lang/DexCache;") { 1399 klass.reset(GetClassRoot(kJavaLangDexCache)); 1400 } else if (descriptor == "Ljava/lang/reflect/ArtField;") { 1401 klass.reset(GetClassRoot(kJavaLangReflectArtField)); 1402 } else if (descriptor == "Ljava/lang/reflect/ArtMethod;") { 1403 klass.reset(GetClassRoot(kJavaLangReflectArtMethod)); 1404 } else { 1405 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1406 } 1407 } else { 1408 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1409 } 1410 klass->SetDexCache(FindDexCache(dex_file)); 1411 LoadClass(dex_file, dex_class_def, klass, class_loader); 1412 // Check for a pending exception during load 1413 if (self->IsExceptionPending()) { 1414 klass->SetStatus(mirror::Class::kStatusError); 1415 return NULL; 1416 } 1417 ObjectLock lock(self, klass.get()); 1418 klass->SetClinitThreadId(self->GetTid()); 1419 // Add the newly loaded class to the loaded classes table. 1420 SirtRef<mirror::Class> existing(self, InsertClass(descriptor, klass.get(), false)); 1421 if (existing.get() != NULL) { 1422 // We failed to insert because we raced with another thread. 1423 return EnsureResolved(self, existing.get()); 1424 } 1425 // Finish loading (if necessary) by finding parents 1426 CHECK(!klass->IsLoaded()); 1427 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1428 // Loading failed. 1429 klass->SetStatus(mirror::Class::kStatusError); 1430 lock.NotifyAll(); 1431 return NULL; 1432 } 1433 CHECK(klass->IsLoaded()); 1434 // Link the class (if necessary) 1435 CHECK(!klass->IsResolved()); 1436 if (!LinkClass(klass, NULL)) { 1437 // Linking failed. 1438 klass->SetStatus(mirror::Class::kStatusError); 1439 lock.NotifyAll(); 1440 return NULL; 1441 } 1442 CHECK(klass->IsResolved()); 1443 1444 /* 1445 * We send CLASS_PREPARE events to the debugger from here. The 1446 * definition of "preparation" is creating the static fields for a 1447 * class and initializing them to the standard default values, but not 1448 * executing any code (that comes later, during "initialization"). 1449 * 1450 * We did the static preparation in LinkClass. 1451 * 1452 * The class has been prepared and resolved but possibly not yet verified 1453 * at this point. 1454 */ 1455 Dbg::PostClassPrepare(klass.get()); 1456 1457 return klass.get(); 1458} 1459 1460// Precomputes size that will be needed for Class, matching LinkStaticFields 1461size_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1462 const DexFile::ClassDef& dex_class_def) { 1463 const byte* class_data = dex_file.GetClassData(dex_class_def); 1464 size_t num_ref = 0; 1465 size_t num_32 = 0; 1466 size_t num_64 = 0; 1467 if (class_data != NULL) { 1468 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1469 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1470 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1471 char c = descriptor[0]; 1472 if (c == 'L' || c == '[') { 1473 num_ref++; 1474 } else if (c == 'J' || c == 'D') { 1475 num_64++; 1476 } else { 1477 num_32++; 1478 } 1479 } 1480 } 1481 // start with generic class data 1482 size_t size = sizeof(mirror::Class); 1483 // follow with reference fields which must be contiguous at start 1484 size += (num_ref * sizeof(uint32_t)); 1485 // if there are 64-bit fields to add, make sure they are aligned 1486 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1487 if (num_32 != 0) { 1488 // use an available 32-bit field for padding 1489 num_32--; 1490 } 1491 size += sizeof(uint32_t); // either way, we are adding a word 1492 DCHECK_EQ(size, RoundUp(size, 8)); 1493 } 1494 // tack on any 64-bit fields now that alignment is assured 1495 size += (num_64 * sizeof(uint64_t)); 1496 // tack on any remaining 32-bit fields 1497 size += (num_32 * sizeof(uint32_t)); 1498 return size; 1499} 1500 1501const OatFile::OatClass* ClassLinker::GetOatClass(const DexFile& dex_file, const char* descriptor) { 1502 DCHECK(descriptor != NULL); 1503 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1504 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << descriptor; 1505 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation()); 1506 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << descriptor; 1507 uint32_t class_def_index; 1508 bool found = dex_file.FindClassDefIndex(descriptor, class_def_index); 1509 CHECK(found) << dex_file.GetLocation() << " " << descriptor; 1510 const OatFile::OatClass* oat_class = oat_dex_file->GetOatClass(class_def_index); 1511 CHECK(oat_class != NULL) << dex_file.GetLocation() << " " << descriptor; 1512 return oat_class; 1513} 1514 1515static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint32_t method_idx) { 1516 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 1517 const DexFile::TypeId& type_id = dex_file.GetTypeId(method_id.class_idx_); 1518 const DexFile::ClassDef* class_def = dex_file.FindClassDef(dex_file.GetTypeDescriptor(type_id)); 1519 CHECK(class_def != NULL); 1520 const byte* class_data = dex_file.GetClassData(*class_def); 1521 CHECK(class_data != NULL); 1522 ClassDataItemIterator it(dex_file, class_data); 1523 // Skip fields 1524 while (it.HasNextStaticField()) { 1525 it.Next(); 1526 } 1527 while (it.HasNextInstanceField()) { 1528 it.Next(); 1529 } 1530 // Process methods 1531 size_t class_def_method_index = 0; 1532 while (it.HasNextDirectMethod()) { 1533 if (it.GetMemberIndex() == method_idx) { 1534 return class_def_method_index; 1535 } 1536 class_def_method_index++; 1537 it.Next(); 1538 } 1539 while (it.HasNextVirtualMethod()) { 1540 if (it.GetMemberIndex() == method_idx) { 1541 return class_def_method_index; 1542 } 1543 class_def_method_index++; 1544 it.Next(); 1545 } 1546 DCHECK(!it.HasNext()); 1547 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1548 return 0; 1549} 1550 1551const OatFile::OatMethod ClassLinker::GetOatMethodFor(const mirror::ArtMethod* method) { 1552 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1553 // method for direct methods (or virtual methods made direct). 1554 mirror::Class* declaring_class = method->GetDeclaringClass(); 1555 size_t oat_method_index; 1556 if (method->IsStatic() || method->IsDirect()) { 1557 // Simple case where the oat method index was stashed at load time. 1558 oat_method_index = method->GetMethodIndex(); 1559 } else { 1560 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1561 // by search for its position in the declared virtual methods. 1562 oat_method_index = declaring_class->NumDirectMethods(); 1563 size_t end = declaring_class->NumVirtualMethods(); 1564 bool found = false; 1565 for (size_t i = 0; i < end; i++) { 1566 if (declaring_class->GetVirtualMethod(i) == method) { 1567 found = true; 1568 break; 1569 } 1570 oat_method_index++; 1571 } 1572 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1573 } 1574 ClassHelper kh(declaring_class); 1575 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(kh.GetDexFile(), kh.GetDescriptor())); 1576 CHECK(oat_class.get() != NULL); 1577 DCHECK_EQ(oat_method_index, 1578 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1579 method->GetDexMethodIndex())); 1580 1581 return oat_class->GetOatMethod(oat_method_index); 1582} 1583 1584// Special case to get oat code without overwriting a trampoline. 1585const void* ClassLinker::GetOatCodeFor(const mirror::ArtMethod* method) { 1586 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1587 if (method->IsProxyMethod()) { 1588#if !defined(ART_USE_PORTABLE_COMPILER) 1589 return reinterpret_cast<void*>(art_quick_proxy_invoke_handler); 1590#else 1591 return reinterpret_cast<void*>(art_portable_proxy_invoke_handler); 1592#endif 1593 } 1594 const void* result = GetOatMethodFor(method).GetCode(); 1595 if (result == NULL) { 1596 // No code? You must mean to go into the interpreter. 1597 result = GetCompiledCodeToInterpreterBridge(); 1598 } 1599 return result; 1600} 1601 1602const void* ClassLinker::GetOatCodeFor(const DexFile& dex_file, uint32_t method_idx) { 1603 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 1604 const char* descriptor = dex_file.GetTypeDescriptor(dex_file.GetTypeId(method_id.class_idx_)); 1605 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, method_idx); 1606 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, descriptor)); 1607 CHECK(oat_class.get() != NULL); 1608 return oat_class->GetOatMethod(oat_method_idx).GetCode(); 1609} 1610 1611// Returns true if the method must run with interpreter, false otherwise. 1612static bool NeedsInterpreter(const mirror::ArtMethod* method, const void* code) { 1613 if (code == NULL) { 1614 // No code: need interpreter. 1615 return true; 1616 } 1617#ifdef ART_SEA_IR_MODE 1618 ScopedObjectAccess soa(Thread::Current()); 1619 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1620 LOG(INFO) << "Found " << PrettyMethod(method); 1621 return false; 1622 } 1623#endif 1624 // If interpreter mode is enabled, every method (except native and proxy) must 1625 // be run with interpreter. 1626 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1627 !method->IsNative() && !method->IsProxyMethod(); 1628} 1629 1630void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1631 ClassHelper kh(klass); 1632 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 1633 CHECK(dex_class_def != NULL); 1634 const DexFile& dex_file = kh.GetDexFile(); 1635 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1636 if (class_data == NULL) { 1637 return; // no fields or methods - for example a marker interface 1638 } 1639 Runtime* runtime = Runtime::Current(); 1640 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1641 // OAT file unavailable 1642 return; 1643 } 1644 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, kh.GetDescriptor())); 1645 CHECK(oat_class.get() != NULL); 1646 ClassDataItemIterator it(dex_file, class_data); 1647 // Skip fields 1648 while (it.HasNextStaticField()) { 1649 it.Next(); 1650 } 1651 while (it.HasNextInstanceField()) { 1652 it.Next(); 1653 } 1654 // Link the code of methods skipped by LinkCode 1655 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1656 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1657 if (!method->IsStatic()) { 1658 // Only update static methods. 1659 continue; 1660 } 1661 const void* code = oat_class->GetOatMethod(method_index).GetCode(); 1662 const bool enter_interpreter = NeedsInterpreter(method, code); 1663 if (enter_interpreter) { 1664 // Use interpreter entry point. 1665 code = GetCompiledCodeToInterpreterBridge(); 1666 } 1667 runtime->GetInstrumentation()->UpdateMethodsCode(method, code); 1668 } 1669 // Ignore virtual methods on the iterator. 1670} 1671 1672static void LinkCode(SirtRef<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class, 1673 uint32_t method_index) 1674 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1675 // Method shouldn't have already been linked. 1676 DCHECK(method->GetEntryPointFromCompiledCode() == NULL); 1677 // Every kind of method should at least get an invoke stub from the oat_method. 1678 // non-abstract methods also get their code pointers. 1679 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1680 oat_method.LinkMethod(method.get()); 1681 1682 // Install entry point from interpreter. 1683 Runtime* runtime = Runtime::Current(); 1684 bool enter_interpreter = NeedsInterpreter(method.get(), method->GetEntryPointFromCompiledCode()); 1685 if (enter_interpreter) { 1686 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1687 } else { 1688 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1689 } 1690 1691 if (method->IsAbstract()) { 1692 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1693 return; 1694 } 1695 1696 if (method->IsStatic() && !method->IsConstructor()) { 1697 // For static methods excluding the class initializer, install the trampoline. 1698 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1699 // after initializing class (see ClassLinker::InitializeClass method). 1700 method->SetEntryPointFromCompiledCode(GetResolutionTrampoline(runtime->GetClassLinker())); 1701 } else if (enter_interpreter) { 1702 // Set entry point from compiled code if there's no code or in interpreter only mode. 1703 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1704 } 1705 1706 if (method->IsNative()) { 1707 // Unregistering restores the dlsym lookup stub. 1708 method->UnregisterNative(Thread::Current()); 1709 } 1710 1711 // Allow instrumentation its chance to hijack code. 1712 runtime->GetInstrumentation()->UpdateMethodsCode(method.get(), 1713 method->GetEntryPointFromCompiledCode()); 1714} 1715 1716void ClassLinker::LoadClass(const DexFile& dex_file, 1717 const DexFile::ClassDef& dex_class_def, 1718 SirtRef<mirror::Class>& klass, 1719 mirror::ClassLoader* class_loader) { 1720 CHECK(klass.get() != NULL); 1721 CHECK(klass->GetDexCache() != NULL); 1722 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1723 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1724 CHECK(descriptor != NULL); 1725 1726 klass->SetClass(GetClassRoot(kJavaLangClass)); 1727 uint32_t access_flags = dex_class_def.access_flags_; 1728 // Make sure that none of our runtime-only flags are set. 1729 // TODO: JACK CLASS ACCESS (HACK TO BE REMOVED) 1730 CHECK_EQ(access_flags & ~(kAccJavaFlagsMask | kAccClassJack), 0U); 1731 klass->SetAccessFlags(access_flags); 1732 klass->SetClassLoader(class_loader); 1733 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1734 klass->SetStatus(mirror::Class::kStatusIdx); 1735 1736 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1737 1738 // Load fields fields. 1739 const byte* class_data = dex_file.GetClassData(dex_class_def); 1740 if (class_data == NULL) { 1741 return; // no fields or methods - for example a marker interface 1742 } 1743 ClassDataItemIterator it(dex_file, class_data); 1744 Thread* self = Thread::Current(); 1745 if (it.NumStaticFields() != 0) { 1746 klass->SetSFields(AllocArtFieldArray(self, it.NumStaticFields())); 1747 } 1748 if (it.NumInstanceFields() != 0) { 1749 klass->SetIFields(AllocArtFieldArray(self, it.NumInstanceFields())); 1750 } 1751 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1752 SirtRef<mirror::ArtField> sfield(self, AllocArtField(self)); 1753 klass->SetStaticField(i, sfield.get()); 1754 LoadField(dex_file, it, klass, sfield); 1755 } 1756 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1757 SirtRef<mirror::ArtField> ifield(self, AllocArtField(self)); 1758 klass->SetInstanceField(i, ifield.get()); 1759 LoadField(dex_file, it, klass, ifield); 1760 } 1761 1762 UniquePtr<const OatFile::OatClass> oat_class; 1763 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1764 oat_class.reset(GetOatClass(dex_file, descriptor)); 1765 } 1766 1767 // Load methods. 1768 if (it.NumDirectMethods() != 0) { 1769 // TODO: append direct methods to class object 1770 klass->SetDirectMethods(AllocArtMethodArray(self, it.NumDirectMethods())); 1771 } 1772 if (it.NumVirtualMethods() != 0) { 1773 // TODO: append direct methods to class object 1774 klass->SetVirtualMethods(AllocArtMethodArray(self, it.NumVirtualMethods())); 1775 } 1776 size_t class_def_method_index = 0; 1777 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1778 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1779 klass->SetDirectMethod(i, method.get()); 1780 if (oat_class.get() != NULL) { 1781 LinkCode(method, oat_class.get(), class_def_method_index); 1782 } 1783 method->SetMethodIndex(class_def_method_index); 1784 class_def_method_index++; 1785 } 1786 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1787 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1788 klass->SetVirtualMethod(i, method.get()); 1789 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1790 if (oat_class.get() != NULL) { 1791 LinkCode(method, oat_class.get(), class_def_method_index); 1792 } 1793 class_def_method_index++; 1794 } 1795 DCHECK(!it.HasNext()); 1796} 1797 1798void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1799 SirtRef<mirror::Class>& klass, SirtRef<mirror::ArtField>& dst) { 1800 uint32_t field_idx = it.GetMemberIndex(); 1801 dst->SetDexFieldIndex(field_idx); 1802 dst->SetDeclaringClass(klass.get()); 1803 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1804} 1805 1806mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1807 const ClassDataItemIterator& it, 1808 SirtRef<mirror::Class>& klass) { 1809 uint32_t dex_method_idx = it.GetMemberIndex(); 1810 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1811 StringPiece method_name(dex_file.GetMethodName(method_id)); 1812 1813 mirror::ArtMethod* dst = AllocArtMethod(self); 1814 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 1815 1816 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 1817 dst->SetDexMethodIndex(dex_method_idx); 1818 dst->SetDeclaringClass(klass.get()); 1819 1820 if (method_name == "finalize") { 1821 // Create the prototype for a signature of "()V" 1822 const DexFile::StringId* void_string_id = dex_file.FindStringId("V"); 1823 if (void_string_id != NULL) { 1824 const DexFile::TypeId* void_type_id = 1825 dex_file.FindTypeId(dex_file.GetIndexForStringId(*void_string_id)); 1826 if (void_type_id != NULL) { 1827 std::vector<uint16_t> no_args; 1828 const DexFile::ProtoId* finalizer_proto = 1829 dex_file.FindProtoId(dex_file.GetIndexForTypeId(*void_type_id), no_args); 1830 if (finalizer_proto != NULL) { 1831 // We have the prototype in the dex file 1832 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 1833 klass->SetFinalizable(); 1834 } else { 1835 StringPiece klass_descriptor(dex_file.StringByTypeIdx(klass->GetDexTypeIndex())); 1836 // The Enum class declares a "final" finalize() method to prevent subclasses from 1837 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 1838 // subclasses, so we exclude it here. 1839 // We also want to avoid setting the flag on Object, where we know that finalize() is 1840 // empty. 1841 if (klass_descriptor != "Ljava/lang/Object;" && 1842 klass_descriptor != "Ljava/lang/Enum;") { 1843 klass->SetFinalizable(); 1844 } 1845 } 1846 } 1847 } 1848 } 1849 } 1850 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 1851 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1852 1853 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 1854 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 1855 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 1856 dst->SetDexCacheInitializedStaticStorage(klass->GetDexCache()->GetInitializedStaticStorage()); 1857 1858 CHECK(dst->IsArtMethod()); 1859 1860 self->EndAssertNoThreadSuspension(old_cause); 1861 return dst; 1862} 1863 1864void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 1865 Thread* self = Thread::Current(); 1866 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1867 AppendToBootClassPath(dex_file, dex_cache); 1868} 1869 1870void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1871 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1872 boot_class_path_.push_back(&dex_file); 1873 RegisterDexFile(dex_file, dex_cache); 1874} 1875 1876bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 1877 dex_lock_.AssertSharedHeld(Thread::Current()); 1878 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1879 if (dex_caches_[i]->GetDexFile() == &dex_file) { 1880 return true; 1881 } 1882 } 1883 return false; 1884} 1885 1886bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 1887 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1888 return IsDexFileRegisteredLocked(dex_file); 1889} 1890 1891void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1892 dex_lock_.AssertExclusiveHeld(Thread::Current()); 1893 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1894 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())); 1895 dex_caches_.push_back(dex_cache.get()); 1896 dex_cache->SetDexFile(&dex_file); 1897 Dirty(); 1898} 1899 1900void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 1901 Thread* self = Thread::Current(); 1902 { 1903 ReaderMutexLock mu(self, dex_lock_); 1904 if (IsDexFileRegisteredLocked(dex_file)) { 1905 return; 1906 } 1907 } 1908 // Don't alloc while holding the lock, since allocation may need to 1909 // suspend all threads and another thread may need the dex_lock_ to 1910 // get to a suspend point. 1911 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1912 { 1913 WriterMutexLock mu(self, dex_lock_); 1914 if (IsDexFileRegisteredLocked(dex_file)) { 1915 return; 1916 } 1917 RegisterDexFileLocked(dex_file, dex_cache); 1918 } 1919} 1920 1921void ClassLinker::RegisterDexFile(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1922 WriterMutexLock mu(Thread::Current(), dex_lock_); 1923 RegisterDexFileLocked(dex_file, dex_cache); 1924} 1925 1926mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 1927 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1928 // Search assuming unique-ness of dex file. 1929 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1930 mirror::DexCache* dex_cache = dex_caches_[i]; 1931 if (dex_cache->GetDexFile() == &dex_file) { 1932 return dex_cache; 1933 } 1934 } 1935 // Search matching by location name. 1936 std::string location(dex_file.GetLocation()); 1937 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1938 mirror::DexCache* dex_cache = dex_caches_[i]; 1939 if (dex_cache->GetDexFile()->GetLocation() == location) { 1940 return dex_cache; 1941 } 1942 } 1943 // Failure, dump diagnostic and abort. 1944 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1945 mirror::DexCache* dex_cache = dex_caches_[i]; 1946 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 1947 } 1948 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 1949 return NULL; 1950} 1951 1952void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 1953 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1954 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1955 dex_caches_[i]->Fixup(resolution_method); 1956 } 1957} 1958 1959mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 1960 return InitializePrimitiveClass(AllocClass(self, sizeof(mirror::Class)), type); 1961} 1962 1963mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, Primitive::Type type) { 1964 CHECK(primitive_class != NULL); 1965 // Must hold lock on object when initializing. 1966 ObjectLock lock(Thread::Current(), primitive_class); 1967 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 1968 primitive_class->SetPrimitiveType(type); 1969 primitive_class->SetStatus(mirror::Class::kStatusInitialized); 1970 mirror::Class* existing = InsertClass(Primitive::Descriptor(type), primitive_class, false); 1971 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 1972 return primitive_class; 1973} 1974 1975// Create an array class (i.e. the class object for the array, not the 1976// array itself). "descriptor" looks like "[C" or "[[[[B" or 1977// "[Ljava/lang/String;". 1978// 1979// If "descriptor" refers to an array of primitives, look up the 1980// primitive type's internally-generated class object. 1981// 1982// "class_loader" is the class loader of the class that's referring to 1983// us. It's used to ensure that we're looking for the element type in 1984// the right context. It does NOT become the class loader for the 1985// array class; that always comes from the base element class. 1986// 1987// Returns NULL with an exception raised on failure. 1988mirror::Class* ClassLinker::CreateArrayClass(const std::string& descriptor, 1989 mirror::ClassLoader* class_loader) { 1990 CHECK_EQ('[', descriptor[0]); 1991 1992 // Identify the underlying component type 1993 mirror::Class* component_type = FindClass(descriptor.substr(1).c_str(), class_loader); 1994 if (component_type == NULL) { 1995 DCHECK(Thread::Current()->IsExceptionPending()); 1996 return NULL; 1997 } 1998 1999 // See if the component type is already loaded. Array classes are 2000 // always associated with the class loader of their underlying 2001 // element type -- an array of Strings goes with the loader for 2002 // java/lang/String -- so we need to look for it there. (The 2003 // caller should have checked for the existence of the class 2004 // before calling here, but they did so with *their* class loader, 2005 // not the component type's loader.) 2006 // 2007 // If we find it, the caller adds "loader" to the class' initiating 2008 // loader list, which should prevent us from going through this again. 2009 // 2010 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2011 // are the same, because our caller (FindClass) just did the 2012 // lookup. (Even if we get this wrong we still have correct behavior, 2013 // because we effectively do this lookup again when we add the new 2014 // class to the hash table --- necessary because of possible races with 2015 // other threads.) 2016 if (class_loader != component_type->GetClassLoader()) { 2017 mirror::Class* new_class = LookupClass(descriptor.c_str(), component_type->GetClassLoader()); 2018 if (new_class != NULL) { 2019 return new_class; 2020 } 2021 } 2022 2023 // Fill out the fields in the Class. 2024 // 2025 // It is possible to execute some methods against arrays, because 2026 // all arrays are subclasses of java_lang_Object_, so we need to set 2027 // up a vtable. We can just point at the one in java_lang_Object_. 2028 // 2029 // Array classes are simple enough that we don't need to do a full 2030 // link step. 2031 Thread* self = Thread::Current(); 2032 SirtRef<mirror::Class> new_class(self, NULL); 2033 if (!init_done_) { 2034 // Classes that were hand created, ie not by FindSystemClass 2035 if (descriptor == "[Ljava/lang/Class;") { 2036 new_class.reset(GetClassRoot(kClassArrayClass)); 2037 } else if (descriptor == "[Ljava/lang/Object;") { 2038 new_class.reset(GetClassRoot(kObjectArrayClass)); 2039 } else if (descriptor == class_roots_descriptors_[kJavaLangStringArrayClass]) { 2040 new_class.reset(GetClassRoot(kJavaLangStringArrayClass)); 2041 } else if (descriptor == class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) { 2042 new_class.reset(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2043 } else if (descriptor == class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) { 2044 new_class.reset(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2045 } else if (descriptor == "[C") { 2046 new_class.reset(GetClassRoot(kCharArrayClass)); 2047 } else if (descriptor == "[I") { 2048 new_class.reset(GetClassRoot(kIntArrayClass)); 2049 } 2050 } 2051 if (new_class.get() == NULL) { 2052 new_class.reset(AllocClass(self, sizeof(mirror::Class))); 2053 if (new_class.get() == NULL) { 2054 return NULL; 2055 } 2056 new_class->SetComponentType(component_type); 2057 } 2058 ObjectLock lock(self, new_class.get()); // Must hold lock on object when initializing. 2059 DCHECK(new_class->GetComponentType() != NULL); 2060 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2061 new_class->SetSuperClass(java_lang_Object); 2062 new_class->SetVTable(java_lang_Object->GetVTable()); 2063 new_class->SetPrimitiveType(Primitive::kPrimNot); 2064 new_class->SetClassLoader(component_type->GetClassLoader()); 2065 new_class->SetStatus(mirror::Class::kStatusInitialized); 2066 // don't need to set new_class->SetObjectSize(..) 2067 // because Object::SizeOf delegates to Array::SizeOf 2068 2069 2070 // All arrays have java/lang/Cloneable and java/io/Serializable as 2071 // interfaces. We need to set that up here, so that stuff like 2072 // "instanceof" works right. 2073 // 2074 // Note: The GC could run during the call to FindSystemClass, 2075 // so we need to make sure the class object is GC-valid while we're in 2076 // there. Do this by clearing the interface list so the GC will just 2077 // think that the entries are null. 2078 2079 2080 // Use the single, global copies of "interfaces" and "iftable" 2081 // (remember not to free them for arrays). 2082 CHECK(array_iftable_ != NULL); 2083 new_class->SetIfTable(array_iftable_); 2084 2085 // Inherit access flags from the component type. 2086 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2087 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2088 access_flags &= kAccJavaFlagsMask; 2089 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2090 // and remove "interface". 2091 access_flags |= kAccAbstract | kAccFinal; 2092 access_flags &= ~kAccInterface; 2093 2094 new_class->SetAccessFlags(access_flags); 2095 2096 mirror::Class* existing = InsertClass(descriptor, new_class.get(), false); 2097 if (existing == NULL) { 2098 return new_class.get(); 2099 } 2100 // Another thread must have loaded the class after we 2101 // started but before we finished. Abandon what we've 2102 // done. 2103 // 2104 // (Yes, this happens.) 2105 2106 return existing; 2107} 2108 2109mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2110 switch (Primitive::GetType(type)) { 2111 case Primitive::kPrimByte: 2112 return GetClassRoot(kPrimitiveByte); 2113 case Primitive::kPrimChar: 2114 return GetClassRoot(kPrimitiveChar); 2115 case Primitive::kPrimDouble: 2116 return GetClassRoot(kPrimitiveDouble); 2117 case Primitive::kPrimFloat: 2118 return GetClassRoot(kPrimitiveFloat); 2119 case Primitive::kPrimInt: 2120 return GetClassRoot(kPrimitiveInt); 2121 case Primitive::kPrimLong: 2122 return GetClassRoot(kPrimitiveLong); 2123 case Primitive::kPrimShort: 2124 return GetClassRoot(kPrimitiveShort); 2125 case Primitive::kPrimBoolean: 2126 return GetClassRoot(kPrimitiveBoolean); 2127 case Primitive::kPrimVoid: 2128 return GetClassRoot(kPrimitiveVoid); 2129 case Primitive::kPrimNot: 2130 break; 2131 } 2132 std::string printable_type(PrintableChar(type)); 2133 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2134 return NULL; 2135} 2136 2137mirror::Class* ClassLinker::InsertClass(const StringPiece& descriptor, mirror::Class* klass, 2138 bool image_class) { 2139 if (VLOG_IS_ON(class_linker)) { 2140 mirror::DexCache* dex_cache = klass->GetDexCache(); 2141 std::string source; 2142 if (dex_cache != NULL) { 2143 source += " from "; 2144 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2145 } 2146 LOG(INFO) << "Loaded class " << descriptor << source; 2147 } 2148 size_t hash = StringPieceHash()(descriptor); 2149 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2150 Table& classes = image_class ? image_classes_ : classes_; 2151 mirror::Class* existing = 2152 LookupClassLocked(descriptor.data(), klass->GetClassLoader(), hash, classes); 2153#ifndef NDEBUG 2154 // Check we don't have the class in the other table in error 2155 Table& other_classes = image_class ? classes_ : image_classes_; 2156 CHECK(LookupClassLocked(descriptor.data(), klass->GetClassLoader(), hash, other_classes) == NULL); 2157#endif 2158 if (existing != NULL) { 2159 return existing; 2160 } 2161 Runtime::Current()->GetHeap()->VerifyObject(klass); 2162 classes.insert(std::make_pair(hash, klass)); 2163 Dirty(); 2164 return NULL; 2165} 2166 2167bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2168 size_t hash = Hash(descriptor); 2169 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2170 typedef Table::iterator It; // TODO: C++0x auto 2171 // TODO: determine if its better to search classes_ or image_classes_ first 2172 ClassHelper kh; 2173 for (It it = classes_.lower_bound(hash), end = classes_.end(); it != end && it->first == hash; 2174 ++it) { 2175 mirror::Class* klass = it->second; 2176 kh.ChangeClass(klass); 2177 if (strcmp(kh.GetDescriptor(), descriptor) == 0 && klass->GetClassLoader() == class_loader) { 2178 classes_.erase(it); 2179 return true; 2180 } 2181 } 2182 for (It it = image_classes_.lower_bound(hash), end = classes_.end(); 2183 it != end && it->first == hash; ++it) { 2184 mirror::Class* klass = it->second; 2185 kh.ChangeClass(klass); 2186 if (strcmp(kh.GetDescriptor(), descriptor) == 0 && klass->GetClassLoader() == class_loader) { 2187 image_classes_.erase(it); 2188 return true; 2189 } 2190 } 2191 return false; 2192} 2193 2194mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2195 const mirror::ClassLoader* class_loader) { 2196 size_t hash = Hash(descriptor); 2197 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2198 // TODO: determine if its better to search classes_ or image_classes_ first 2199 mirror::Class* klass = NULL; 2200 // Use image class only if the class_loader is null. 2201 if (class_loader == NULL) { 2202 klass = LookupClassLocked(descriptor, class_loader, hash, image_classes_); 2203 } 2204 if (klass != NULL) { 2205 return klass; 2206 } 2207 return LookupClassLocked(descriptor, class_loader, hash, classes_); 2208} 2209 2210mirror::Class* ClassLinker::LookupClassLocked(const char* descriptor, 2211 const mirror::ClassLoader* class_loader, 2212 size_t hash, const Table& classes) { 2213 ClassHelper kh(NULL, this); 2214 typedef Table::const_iterator It; // TODO: C++0x auto 2215 for (It it = classes.lower_bound(hash), end = classes_.end(); it != end && it->first == hash; ++it) { 2216 mirror::Class* klass = it->second; 2217 kh.ChangeClass(klass); 2218 if (strcmp(descriptor, kh.GetDescriptor()) == 0 && klass->GetClassLoader() == class_loader) { 2219#ifndef NDEBUG 2220 for (++it; it != end && it->first == hash; ++it) { 2221 mirror::Class* klass2 = it->second; 2222 kh.ChangeClass(klass2); 2223 CHECK(!(strcmp(descriptor, kh.GetDescriptor()) == 0 && klass2->GetClassLoader() == class_loader)) 2224 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2225 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2226 } 2227#endif 2228 return klass; 2229 } 2230 } 2231 return NULL; 2232} 2233 2234void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& classes) { 2235 classes.clear(); 2236 size_t hash = Hash(descriptor); 2237 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2238 typedef Table::const_iterator It; // TODO: C++0x auto 2239 // TODO: determine if its better to search classes_ or image_classes_ first 2240 ClassHelper kh(NULL, this); 2241 for (It it = classes_.lower_bound(hash), end = classes_.end(); it != end && it->first == hash; ++it) { 2242 mirror::Class* klass = it->second; 2243 kh.ChangeClass(klass); 2244 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2245 classes.push_back(klass); 2246 } 2247 } 2248 for (It it = image_classes_.lower_bound(hash), end = classes_.end(); it != end && it->first == hash; ++it) { 2249 mirror::Class* klass = it->second; 2250 kh.ChangeClass(klass); 2251 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2252 classes.push_back(klass); 2253 } 2254 } 2255} 2256 2257void ClassLinker::VerifyClass(mirror::Class* klass) { 2258 // TODO: assert that the monitor on the Class is held 2259 Thread* self = Thread::Current(); 2260 ObjectLock lock(self, klass); 2261 2262 // Don't attempt to re-verify if already sufficiently verified. 2263 if (klass->IsVerified() || 2264 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2265 return; 2266 } 2267 2268 // The class might already be erroneous, for example at compile time if we attempted to verify 2269 // this class as a parent to another. 2270 if (klass->IsErroneous()) { 2271 ThrowEarlierClassFailure(klass); 2272 return; 2273 } 2274 2275 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2276 klass->SetStatus(mirror::Class::kStatusVerifying); 2277 } else { 2278 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2279 << PrettyClass(klass); 2280 CHECK(!Runtime::Current()->IsCompiler()); 2281 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime); 2282 } 2283 2284 // Verify super class. 2285 mirror::Class* super = klass->GetSuperClass(); 2286 if (super != NULL) { 2287 // Acquire lock to prevent races on verifying the super class. 2288 ObjectLock lock(self, super); 2289 2290 if (!super->IsVerified() && !super->IsErroneous()) { 2291 Runtime::Current()->GetClassLinker()->VerifyClass(super); 2292 } 2293 if (!super->IsCompileTimeVerified()) { 2294 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2295 PrettyDescriptor(klass).c_str(), 2296 PrettyDescriptor(super).c_str())); 2297 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2298 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 2299 if (cause.get() != NULL) { 2300 self->ClearException(); 2301 } 2302 ThrowVerifyError(klass, "%s", error_msg.c_str()); 2303 if (cause.get() != NULL) { 2304 self->GetException(NULL)->SetCause(cause.get()); 2305 } 2306 klass->SetStatus(mirror::Class::kStatusError); 2307 return; 2308 } 2309 } 2310 2311 // Try to use verification information from the oat file, otherwise do runtime verification. 2312 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2313 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2314 bool preverified = VerifyClassUsingOatFile(dex_file, klass, oat_file_class_status); 2315 if (oat_file_class_status == mirror::Class::kStatusError) { 2316 LOG(WARNING) << "Skipping runtime verification of erroneous class " << PrettyDescriptor(klass) 2317 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2318 ThrowVerifyError(klass, "Rejecting class %s because it failed compile-time verification", 2319 PrettyDescriptor(klass).c_str()); 2320 klass->SetStatus(mirror::Class::kStatusError); 2321 return; 2322 } 2323 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2324 std::string error_msg; 2325 if (!preverified) { 2326 verifier_failure = verifier::MethodVerifier::VerifyClass(klass, error_msg, 2327 Runtime::Current()->IsCompiler()); 2328 } 2329 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2330 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2331 LOG(WARNING) << "Soft verification failure in class " << PrettyDescriptor(klass) 2332 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2333 << " because: " << error_msg; 2334 } 2335 self->AssertNoPendingException(); 2336 // Make sure all classes referenced by catch blocks are resolved. 2337 ResolveClassExceptionHandlerTypes(dex_file, klass); 2338 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2339 klass->SetStatus(mirror::Class::kStatusVerified); 2340 } else { 2341 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2342 // Soft failures at compile time should be retried at runtime. Soft 2343 // failures at runtime will be handled by slow paths in the generated 2344 // code. Set status accordingly. 2345 if (Runtime::Current()->IsCompiler()) { 2346 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime); 2347 } else { 2348 klass->SetStatus(mirror::Class::kStatusVerified); 2349 } 2350 } 2351 } else { 2352 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass) 2353 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2354 << " because: " << error_msg; 2355 self->AssertNoPendingException(); 2356 ThrowVerifyError(klass, "%s", error_msg.c_str()); 2357 klass->SetStatus(mirror::Class::kStatusError); 2358 } 2359 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2360 // Class is verified so we don't need to do any access check in its methods. 2361 // Let the interpreter know it by setting the kAccPreverified flag onto each 2362 // method. 2363 // Note: we're going here during compilation and at runtime. When we set the 2364 // kAccPreverified flag when compiling image classes, the flag is recorded 2365 // in the image and is set when loading the image. 2366 klass->SetPreverifiedFlagOnAllMethods(); 2367 } 2368} 2369 2370bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2371 mirror::Class::Status& oat_file_class_status) { 2372 // If we're compiling, we can only verify the class using the oat file if 2373 // we are not compiling the image or if the class we're verifying is not part of 2374 // the app. In other words, we will only check for preverification of bootclasspath 2375 // classes. 2376 if (Runtime::Current()->IsCompiler()) { 2377 // Are we compiling the bootclasspath? 2378 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2379 return false; 2380 } 2381 // We are compiling an app (not the image). 2382 2383 // Is this an app class? (I.e. not a bootclasspath class) 2384 if (klass->GetClassLoader() != NULL) { 2385 return false; 2386 } 2387 } 2388 2389 2390 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2391 // Make this work with gtests, which do not set up the image properly. 2392 // TODO: we should clean up gtests to set up the image path properly. 2393 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2394 return false; 2395 } 2396 2397 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2398 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation()); 2399 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2400 const char* descriptor = ClassHelper(klass).GetDescriptor(); 2401 uint32_t class_def_index; 2402 bool found = dex_file.FindClassDefIndex(descriptor, class_def_index); 2403 CHECK(found) << dex_file.GetLocation() << " " << PrettyClass(klass) << " " << descriptor; 2404 UniquePtr<const OatFile::OatClass> oat_class(oat_dex_file->GetOatClass(class_def_index)); 2405 CHECK(oat_class.get() != NULL) 2406 << dex_file.GetLocation() << " " << PrettyClass(klass) << " " << descriptor; 2407 oat_file_class_status = oat_class->GetStatus(); 2408 if (oat_file_class_status == mirror::Class::kStatusVerified || 2409 oat_file_class_status == mirror::Class::kStatusInitialized) { 2410 return true; 2411 } 2412 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2413 // Compile time verification failed with a soft error. Compile time verification can fail 2414 // because we have incomplete type information. Consider the following: 2415 // class ... { 2416 // Foo x; 2417 // .... () { 2418 // if (...) { 2419 // v1 gets assigned a type of resolved class Foo 2420 // } else { 2421 // v1 gets assigned a type of unresolved class Bar 2422 // } 2423 // iput x = v1 2424 // } } 2425 // when we merge v1 following the if-the-else it results in Conflict 2426 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2427 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2428 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2429 // at compile time). 2430 return false; 2431 } 2432 if (oat_file_class_status == mirror::Class::kStatusError) { 2433 // Compile time verification failed with a hard error. This is caused by invalid instructions 2434 // in the class. These errors are unrecoverable. 2435 return false; 2436 } 2437 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2438 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2439 // not loading the class. 2440 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2441 // isn't a problem and this case shouldn't occur 2442 return false; 2443 } 2444 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2445 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " << descriptor; 2446 2447 return false; 2448} 2449 2450void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, mirror::Class* klass) { 2451 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2452 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2453 } 2454 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2455 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2456 } 2457} 2458 2459void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2460 mirror::ArtMethod* method) { 2461 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2462 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2463 if (code_item == NULL) { 2464 return; // native or abstract method 2465 } 2466 if (code_item->tries_size_ == 0) { 2467 return; // nothing to process 2468 } 2469 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2470 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2471 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2472 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2473 CatchHandlerIterator iterator(handlers_ptr); 2474 for (; iterator.HasNext(); iterator.Next()) { 2475 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2476 // unresolved exception types will be ignored by exception delivery 2477 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2478 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2479 if (exception_type == NULL) { 2480 DCHECK(Thread::Current()->IsExceptionPending()); 2481 Thread::Current()->ClearException(); 2482 } 2483 } 2484 } 2485 handlers_ptr = iterator.EndDataPointer(); 2486 } 2487} 2488 2489static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2490static void CheckProxyMethod(mirror::ArtMethod* method, 2491 SirtRef<mirror::ArtMethod>& prototype); 2492 2493mirror::Class* ClassLinker::CreateProxyClass(mirror::String* name, 2494 mirror::ObjectArray<mirror::Class>* interfaces, 2495 mirror::ClassLoader* loader, 2496 mirror::ObjectArray<mirror::ArtMethod>* methods, 2497 mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >* throws) { 2498 Thread* self = Thread::Current(); 2499 SirtRef<mirror::Class> klass(self, AllocClass(self, GetClassRoot(kJavaLangClass), 2500 sizeof(mirror::SynthesizedProxyClass))); 2501 CHECK(klass.get() != NULL); 2502 DCHECK(klass->GetClass() != NULL); 2503 klass->SetObjectSize(sizeof(mirror::Proxy)); 2504 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2505 klass->SetClassLoader(loader); 2506 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2507 klass->SetName(name); 2508 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2509 klass->SetDexCache(proxy_class->GetDexCache()); 2510 2511 klass->SetStatus(mirror::Class::kStatusIdx); 2512 2513 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); 2514 2515 // Instance fields are inherited, but we add a couple of static fields... 2516 klass->SetSFields(AllocArtFieldArray(self, 2)); 2517 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2518 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2519 SirtRef<mirror::ArtField> interfaces_sfield(self, AllocArtField(self)); 2520 klass->SetStaticField(0, interfaces_sfield.get()); 2521 interfaces_sfield->SetDexFieldIndex(0); 2522 interfaces_sfield->SetDeclaringClass(klass.get()); 2523 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2524 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2525 SirtRef<mirror::ArtField> throws_sfield(self, AllocArtField(self)); 2526 klass->SetStaticField(1, throws_sfield.get()); 2527 throws_sfield->SetDexFieldIndex(1); 2528 throws_sfield->SetDeclaringClass(klass.get()); 2529 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2530 2531 // Proxies have 1 direct method, the constructor 2532 klass->SetDirectMethods(AllocArtMethodArray(self, 1)); 2533 klass->SetDirectMethod(0, CreateProxyConstructor(self, klass, proxy_class)); 2534 2535 // Create virtual method using specified prototypes 2536 size_t num_virtual_methods = methods->GetLength(); 2537 klass->SetVirtualMethods(AllocArtMethodArray(self, num_virtual_methods)); 2538 for (size_t i = 0; i < num_virtual_methods; ++i) { 2539 SirtRef<mirror::ArtMethod> prototype(self, methods->Get(i)); 2540 klass->SetVirtualMethod(i, CreateProxyMethod(self, klass, prototype)); 2541 } 2542 2543 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2544 klass->SetStatus(mirror::Class::kStatusLoaded); // Class is now effectively in the loaded state 2545 self->AssertNoPendingException(); 2546 2547 // Link the fields and virtual methods, creating vtable and iftables 2548 if (!LinkClass(klass, interfaces)) { 2549 klass->SetStatus(mirror::Class::kStatusError); 2550 return NULL; 2551 } 2552 { 2553 ObjectLock lock(self, klass.get()); // Must hold lock on object when initializing. 2554 interfaces_sfield->SetObject(klass.get(), interfaces); 2555 throws_sfield->SetObject(klass.get(), throws); 2556 klass->SetStatus(mirror::Class::kStatusInitialized); 2557 } 2558 2559 // sanity checks 2560 if (kIsDebugBuild) { 2561 CHECK(klass->GetIFields() == NULL); 2562 CheckProxyConstructor(klass->GetDirectMethod(0)); 2563 for (size_t i = 0; i < num_virtual_methods; ++i) { 2564 SirtRef<mirror::ArtMethod> prototype(self, methods->Get(i)); 2565 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2566 } 2567 2568 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2569 name->ToModifiedUtf8().c_str())); 2570 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2571 2572 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2573 name->ToModifiedUtf8().c_str())); 2574 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2575 2576 mirror::SynthesizedProxyClass* synth_proxy_class = 2577 down_cast<mirror::SynthesizedProxyClass*>(klass.get()); 2578 CHECK_EQ(synth_proxy_class->GetInterfaces(), interfaces); 2579 CHECK_EQ(synth_proxy_class->GetThrows(), throws); 2580 } 2581 return klass.get(); 2582} 2583 2584std::string ClassLinker::GetDescriptorForProxy(const mirror::Class* proxy_class) { 2585 DCHECK(proxy_class->IsProxyClass()); 2586 mirror::String* name = proxy_class->GetName(); 2587 DCHECK(name != NULL); 2588 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2589} 2590 2591mirror::ArtMethod* ClassLinker::FindMethodForProxy(const mirror::Class* proxy_class, 2592 const mirror::ArtMethod* proxy_method) { 2593 DCHECK(proxy_class->IsProxyClass()); 2594 DCHECK(proxy_method->IsProxyMethod()); 2595 // Locate the dex cache of the original interface/Object 2596 mirror::DexCache* dex_cache = NULL; 2597 { 2598 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2599 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2600 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2601 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2602 dex_cache = dex_caches_[i]; 2603 break; 2604 } 2605 } 2606 } 2607 CHECK(dex_cache != NULL); 2608 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2609 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2610 CHECK(resolved_method != NULL); 2611 return resolved_method; 2612} 2613 2614 2615mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2616 SirtRef<mirror::Class>& klass, 2617 mirror::Class* proxy_class) { 2618 // Create constructor for Proxy that must initialize h 2619 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2620 proxy_class->GetDirectMethods(); 2621 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2622 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2623 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2624 // code_ too) 2625 mirror::ArtMethod* constructor = 2626 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2627 // Make this constructor public and fix the class to be our Proxy version 2628 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2629 constructor->SetDeclaringClass(klass.get()); 2630 return constructor; 2631} 2632 2633static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2634 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2635 CHECK(constructor->IsConstructor()); 2636 MethodHelper mh(constructor); 2637 CHECK_STREQ(mh.GetName(), "<init>"); 2638 CHECK_EQ(mh.GetSignature(), std::string("(Ljava/lang/reflect/InvocationHandler;)V")); 2639 DCHECK(constructor->IsPublic()); 2640} 2641 2642mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, SirtRef<mirror::Class>& klass, 2643 SirtRef<mirror::ArtMethod>& prototype) { 2644 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2645 // prototype method 2646 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2647 prototype.get()); 2648 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2649 // as necessary 2650 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 2651 2652 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 2653 // the intersection of throw exceptions as defined in Proxy 2654 method->SetDeclaringClass(klass.get()); 2655 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 2656 2657 // At runtime the method looks like a reference and argument saving method, clone the code 2658 // related parameters from this method. 2659 mirror::ArtMethod* refs_and_args = 2660 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 2661 method->SetCoreSpillMask(refs_and_args->GetCoreSpillMask()); 2662 method->SetFpSpillMask(refs_and_args->GetFpSpillMask()); 2663 method->SetFrameSizeInBytes(refs_and_args->GetFrameSizeInBytes()); 2664 method->SetEntryPointFromCompiledCode(GetProxyInvokeHandler()); 2665 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2666 2667 return method; 2668} 2669 2670static void CheckProxyMethod(mirror::ArtMethod* method, 2671 SirtRef<mirror::ArtMethod>& prototype) 2672 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2673 // Basic sanity 2674 CHECK(!prototype->IsFinal()); 2675 CHECK(method->IsFinal()); 2676 CHECK(!method->IsAbstract()); 2677 2678 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 2679 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 2680 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 2681 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 2682 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 2683 CHECK_EQ(prototype->GetDexCacheInitializedStaticStorage(), 2684 method->GetDexCacheInitializedStaticStorage()); 2685 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 2686 2687 MethodHelper mh(method); 2688 MethodHelper mh2(prototype.get()); 2689 CHECK_STREQ(mh.GetName(), mh2.GetName()); 2690 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 2691 // More complex sanity - via dex cache 2692 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 2693} 2694 2695bool ClassLinker::InitializeClass(mirror::Class* klass, bool can_run_clinit, bool can_init_statics) { 2696 CHECK(klass->IsResolved() || klass->IsErroneous()) 2697 << PrettyClass(klass) << ": state=" << klass->GetStatus(); 2698 2699 Thread* self = Thread::Current(); 2700 2701 mirror::ArtMethod* clinit = NULL; 2702 { 2703 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 2704 ObjectLock lock(self, klass); 2705 2706 if (klass->GetStatus() == mirror::Class::kStatusInitialized) { 2707 return true; 2708 } 2709 2710 if (klass->IsErroneous()) { 2711 ThrowEarlierClassFailure(klass); 2712 return false; 2713 } 2714 2715 if (klass->GetStatus() == mirror::Class::kStatusResolved || 2716 klass->GetStatus() == mirror::Class::kStatusRetryVerificationAtRuntime) { 2717 VerifyClass(klass); 2718 if (klass->GetStatus() != mirror::Class::kStatusVerified) { 2719 if (klass->GetStatus() == mirror::Class::kStatusError) { 2720 CHECK(self->IsExceptionPending()); 2721 } 2722 return false; 2723 } 2724 } 2725 2726 clinit = klass->FindDeclaredDirectMethod("<clinit>", "()V"); 2727 if (clinit != NULL && !can_run_clinit) { 2728 // if the class has a <clinit> but we can't run it during compilation, 2729 // don't bother going to kStatusInitializing. We return false so that 2730 // sub-classes don't believe this class is initialized. 2731 // Opportunistically link non-static methods, TODO: don't initialize and dirty pages 2732 // in second pass. 2733 return false; 2734 } 2735 2736 // If the class is kStatusInitializing, either this thread is 2737 // initializing higher up the stack or another thread has beat us 2738 // to initializing and we need to wait. Either way, this 2739 // invocation of InitializeClass will not be responsible for 2740 // running <clinit> and will return. 2741 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 2742 // We caught somebody else in the act; was it us? 2743 if (klass->GetClinitThreadId() == self->GetTid()) { 2744 // Yes. That's fine. Return so we can continue initializing. 2745 return true; 2746 } 2747 // No. That's fine. Wait for another thread to finish initializing. 2748 return WaitForInitializeClass(klass, self, lock); 2749 } 2750 2751 if (!ValidateSuperClassDescriptors(klass)) { 2752 klass->SetStatus(mirror::Class::kStatusError); 2753 lock.NotifyAll(); 2754 return false; 2755 } 2756 2757 DCHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass); 2758 2759 klass->SetClinitThreadId(self->GetTid()); 2760 klass->SetStatus(mirror::Class::kStatusInitializing); 2761 } 2762 2763 uint64_t t0 = NanoTime(); 2764 2765 if (!InitializeSuperClass(klass, can_run_clinit, can_init_statics)) { 2766 // Super class initialization failed, this can be because we can't run 2767 // super-class class initializers in which case we'll be verified. 2768 // Otherwise this class is erroneous. 2769 if (!can_run_clinit) { 2770 CHECK(klass->IsVerified()); 2771 } else { 2772 CHECK(klass->IsErroneous()); 2773 } 2774 // Signal to any waiting threads that saw this class as initializing. 2775 ObjectLock lock(self, klass); 2776 lock.NotifyAll(); 2777 return false; 2778 } 2779 2780 bool has_static_field_initializers = InitializeStaticFields(klass); 2781 2782 if (clinit != NULL) { 2783 if (Runtime::Current()->IsStarted()) { 2784 JValue result; 2785 clinit->Invoke(self, NULL, 0, &result, 'V'); 2786 } else { 2787 art::interpreter::EnterInterpreterFromInvoke(self, clinit, NULL, NULL, NULL); 2788 } 2789 } 2790 2791 FixupStaticTrampolines(klass); 2792 2793 uint64_t t1 = NanoTime(); 2794 2795 bool success = true; 2796 { 2797 ObjectLock lock(self, klass); 2798 2799 if (self->IsExceptionPending()) { 2800 WrapExceptionInInitializer(); 2801 klass->SetStatus(mirror::Class::kStatusError); 2802 success = false; 2803 } else { 2804 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 2805 RuntimeStats* thread_stats = self->GetStats(); 2806 ++global_stats->class_init_count; 2807 ++thread_stats->class_init_count; 2808 global_stats->class_init_time_ns += (t1 - t0); 2809 thread_stats->class_init_time_ns += (t1 - t0); 2810 // Set the class as initialized except if we can't initialize static fields and static field 2811 // initialization is necessary. 2812 if (!can_init_statics && has_static_field_initializers) { 2813 klass->SetStatus(mirror::Class::kStatusVerified); // Don't leave class in initializing state. 2814 success = false; 2815 } else { 2816 klass->SetStatus(mirror::Class::kStatusInitialized); 2817 } 2818 if (VLOG_IS_ON(class_linker)) { 2819 ClassHelper kh(klass); 2820 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 2821 } 2822 } 2823 lock.NotifyAll(); 2824 } 2825 return success; 2826} 2827 2828bool ClassLinker::WaitForInitializeClass(mirror::Class* klass, Thread* self, ObjectLock& lock) 2829 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2830 while (true) { 2831 self->AssertNoPendingException(); 2832 lock.WaitIgnoringInterrupts(); 2833 2834 // When we wake up, repeat the test for init-in-progress. If 2835 // there's an exception pending (only possible if 2836 // "interruptShouldThrow" was set), bail out. 2837 if (self->IsExceptionPending()) { 2838 WrapExceptionInInitializer(); 2839 klass->SetStatus(mirror::Class::kStatusError); 2840 return false; 2841 } 2842 // Spurious wakeup? Go back to waiting. 2843 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 2844 continue; 2845 } 2846 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 2847 // Compile time initialization failed. 2848 return false; 2849 } 2850 if (klass->IsErroneous()) { 2851 // The caller wants an exception, but it was thrown in a 2852 // different thread. Synthesize one here. 2853 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 2854 PrettyDescriptor(klass).c_str()); 2855 return false; 2856 } 2857 if (klass->IsInitialized()) { 2858 return true; 2859 } 2860 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass) << " is " << klass->GetStatus(); 2861 } 2862 LOG(FATAL) << "Not Reached" << PrettyClass(klass); 2863} 2864 2865bool ClassLinker::ValidateSuperClassDescriptors(const mirror::Class* klass) { 2866 if (klass->IsInterface()) { 2867 return true; 2868 } 2869 // begin with the methods local to the superclass 2870 if (klass->HasSuperClass() && 2871 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 2872 const mirror::Class* super = klass->GetSuperClass(); 2873 for (int i = super->GetVTable()->GetLength() - 1; i >= 0; --i) { 2874 const mirror::ArtMethod* method = klass->GetVTable()->Get(i); 2875 if (method != super->GetVTable()->Get(i) && 2876 !IsSameMethodSignatureInDifferentClassContexts(method, super, klass)) { 2877 ThrowLinkageError(klass, "Class %s method %s resolves differently in superclass %s", 2878 PrettyDescriptor(klass).c_str(), PrettyMethod(method).c_str(), 2879 PrettyDescriptor(super).c_str()); 2880 return false; 2881 } 2882 } 2883 } 2884 mirror::IfTable* iftable = klass->GetIfTable(); 2885 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 2886 mirror::Class* interface = iftable->GetInterface(i); 2887 if (klass->GetClassLoader() != interface->GetClassLoader()) { 2888 for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { 2889 const mirror::ArtMethod* method = iftable->GetMethodArray(i)->Get(j); 2890 if (!IsSameMethodSignatureInDifferentClassContexts(method, interface, 2891 method->GetDeclaringClass())) { 2892 ThrowLinkageError(klass, "Class %s method %s resolves differently in interface %s", 2893 PrettyDescriptor(method->GetDeclaringClass()).c_str(), 2894 PrettyMethod(method).c_str(), 2895 PrettyDescriptor(interface).c_str()); 2896 return false; 2897 } 2898 } 2899 } 2900 } 2901 return true; 2902} 2903 2904// Returns true if classes referenced by the signature of the method are the 2905// same classes in klass1 as they are in klass2. 2906bool ClassLinker::IsSameMethodSignatureInDifferentClassContexts(const mirror::ArtMethod* method, 2907 const mirror::Class* klass1, 2908 const mirror::Class* klass2) { 2909 if (klass1 == klass2) { 2910 return true; 2911 } 2912 const DexFile& dex_file = *method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 2913 const DexFile::ProtoId& proto_id = 2914 dex_file.GetMethodPrototype(dex_file.GetMethodId(method->GetDexMethodIndex())); 2915 for (DexFileParameterIterator it(dex_file, proto_id); it.HasNext(); it.Next()) { 2916 const char* descriptor = it.GetDescriptor(); 2917 if (descriptor == NULL) { 2918 break; 2919 } 2920 if (descriptor[0] == 'L' || descriptor[0] == '[') { 2921 // Found a non-primitive type. 2922 if (!IsSameDescriptorInDifferentClassContexts(descriptor, klass1, klass2)) { 2923 return false; 2924 } 2925 } 2926 } 2927 // Check the return type 2928 const char* descriptor = dex_file.GetReturnTypeDescriptor(proto_id); 2929 if (descriptor[0] == 'L' || descriptor[0] == '[') { 2930 if (!IsSameDescriptorInDifferentClassContexts(descriptor, klass1, klass2)) { 2931 return false; 2932 } 2933 } 2934 return true; 2935} 2936 2937// Returns true if the descriptor resolves to the same class in the context of klass1 and klass2. 2938bool ClassLinker::IsSameDescriptorInDifferentClassContexts(const char* descriptor, 2939 const mirror::Class* klass1, 2940 const mirror::Class* klass2) { 2941 CHECK(descriptor != NULL); 2942 CHECK(klass1 != NULL); 2943 CHECK(klass2 != NULL); 2944 if (klass1 == klass2) { 2945 return true; 2946 } 2947 mirror::Class* found1 = FindClass(descriptor, klass1->GetClassLoader()); 2948 if (found1 == NULL) { 2949 Thread::Current()->ClearException(); 2950 } 2951 mirror::Class* found2 = FindClass(descriptor, klass2->GetClassLoader()); 2952 if (found2 == NULL) { 2953 Thread::Current()->ClearException(); 2954 } 2955 return found1 == found2; 2956} 2957 2958bool ClassLinker::InitializeSuperClass(mirror::Class* klass, bool can_run_clinit, bool can_init_fields) { 2959 CHECK(klass != NULL); 2960 if (!klass->IsInterface() && klass->HasSuperClass()) { 2961 mirror::Class* super_class = klass->GetSuperClass(); 2962 if (!super_class->IsInitialized()) { 2963 CHECK(!super_class->IsInterface()); 2964 // Must hold lock on object when initializing and setting status. 2965 Thread* self = Thread::Current(); 2966 ObjectLock lock(self, klass); 2967 bool super_initialized = InitializeClass(super_class, can_run_clinit, can_init_fields); 2968 // TODO: check for a pending exception 2969 if (!super_initialized) { 2970 if (!can_run_clinit) { 2971 // Don't set status to error when we can't run <clinit>. 2972 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusInitializing) << PrettyClass(klass); 2973 klass->SetStatus(mirror::Class::kStatusVerified); 2974 return false; 2975 } 2976 klass->SetStatus(mirror::Class::kStatusError); 2977 klass->NotifyAll(self); 2978 return false; 2979 } 2980 } 2981 } 2982 return true; 2983} 2984 2985bool ClassLinker::EnsureInitialized(mirror::Class* c, bool can_run_clinit, bool can_init_fields) { 2986 DCHECK(c != NULL); 2987 if (c->IsInitialized()) { 2988 return true; 2989 } 2990 2991 Thread* self = Thread::Current(); 2992 ScopedThreadStateChange tsc(self, kRunnable); 2993 bool success = InitializeClass(c, can_run_clinit, can_init_fields); 2994 if (!success) { 2995 CHECK(self->IsExceptionPending() || !can_run_clinit) << PrettyClass(c); 2996 } 2997 return success; 2998} 2999 3000void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3001 mirror::Class* c, SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3002 mirror::ClassLoader* cl = c->GetClassLoader(); 3003 const byte* class_data = dex_file.GetClassData(dex_class_def); 3004 ClassDataItemIterator it(dex_file, class_data); 3005 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3006 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), c->GetDexCache(), cl, true)); 3007 } 3008} 3009 3010bool ClassLinker::InitializeStaticFields(mirror::Class* klass) { 3011 size_t num_static_fields = klass->NumStaticFields(); 3012 if (num_static_fields == 0) { 3013 return false; 3014 } 3015 mirror::DexCache* dex_cache = klass->GetDexCache(); 3016 // TODO: this seems like the wrong check. do we really want !IsPrimitive && !IsArray? 3017 if (dex_cache == NULL) { 3018 return false; 3019 } 3020 ClassHelper kh(klass); 3021 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3022 CHECK(dex_class_def != NULL); 3023 const DexFile& dex_file = kh.GetDexFile(); 3024 EncodedStaticFieldValueIterator it(dex_file, dex_cache, klass->GetClassLoader(), 3025 this, *dex_class_def); 3026 3027 if (it.HasNext()) { 3028 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 3029 SafeMap<uint32_t, mirror::ArtField*> field_map; 3030 ConstructFieldMap(dex_file, *dex_class_def, klass, field_map); 3031 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3032 it.ReadValueToField(field_map.Get(i)); 3033 } 3034 return true; 3035 } 3036 return false; 3037} 3038 3039bool ClassLinker::LinkClass(SirtRef<mirror::Class>& klass, 3040 mirror::ObjectArray<mirror::Class>* interfaces) { 3041 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3042 if (!LinkSuperClass(klass)) { 3043 return false; 3044 } 3045 if (!LinkMethods(klass, interfaces)) { 3046 return false; 3047 } 3048 if (!LinkInstanceFields(klass)) { 3049 return false; 3050 } 3051 if (!LinkStaticFields(klass)) { 3052 return false; 3053 } 3054 CreateReferenceInstanceOffsets(klass); 3055 CreateReferenceStaticOffsets(klass); 3056 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3057 klass->SetStatus(mirror::Class::kStatusResolved); 3058 return true; 3059} 3060 3061bool ClassLinker::LoadSuperAndInterfaces(SirtRef<mirror::Class>& klass, const DexFile& dex_file) { 3062 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3063 StringPiece descriptor(dex_file.StringByTypeIdx(klass->GetDexTypeIndex())); 3064 const DexFile::ClassDef* class_def = dex_file.FindClassDef(descriptor); 3065 CHECK(class_def != NULL); 3066 uint16_t super_class_idx = class_def->superclass_idx_; 3067 if (super_class_idx != DexFile::kDexNoIndex16) { 3068 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.get()); 3069 if (super_class == NULL) { 3070 DCHECK(Thread::Current()->IsExceptionPending()); 3071 return false; 3072 } 3073 // Verify 3074 if (!klass->CanAccess(super_class)) { 3075 ThrowIllegalAccessError(klass.get(), "Class %s extended by class %s is inaccessible", 3076 PrettyDescriptor(super_class).c_str(), 3077 PrettyDescriptor(klass.get()).c_str()); 3078 return false; 3079 } 3080 klass->SetSuperClass(super_class); 3081 } 3082 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(*class_def); 3083 if (interfaces != NULL) { 3084 for (size_t i = 0; i < interfaces->Size(); i++) { 3085 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3086 mirror::Class* interface = ResolveType(dex_file, idx, klass.get()); 3087 if (interface == NULL) { 3088 DCHECK(Thread::Current()->IsExceptionPending()); 3089 return false; 3090 } 3091 // Verify 3092 if (!klass->CanAccess(interface)) { 3093 // TODO: the RI seemed to ignore this in my testing. 3094 ThrowIllegalAccessError(klass.get(), "Interface %s implemented by class %s is inaccessible", 3095 PrettyDescriptor(interface).c_str(), 3096 PrettyDescriptor(klass.get()).c_str()); 3097 return false; 3098 } 3099 } 3100 } 3101 // Mark the class as loaded. 3102 klass->SetStatus(mirror::Class::kStatusLoaded); 3103 return true; 3104} 3105 3106bool ClassLinker::LinkSuperClass(SirtRef<mirror::Class>& klass) { 3107 CHECK(!klass->IsPrimitive()); 3108 mirror::Class* super = klass->GetSuperClass(); 3109 if (klass.get() == GetClassRoot(kJavaLangObject)) { 3110 if (super != NULL) { 3111 ThrowClassFormatError(klass.get(), "java.lang.Object must not have a superclass"); 3112 return false; 3113 } 3114 return true; 3115 } 3116 if (super == NULL) { 3117 ThrowLinkageError(klass.get(), "No superclass defined for class %s", 3118 PrettyDescriptor(klass.get()).c_str()); 3119 return false; 3120 } 3121 // Verify 3122 if (super->IsFinal() || super->IsInterface()) { 3123 ThrowIncompatibleClassChangeError(klass.get(), "Superclass %s of %s is %s", 3124 PrettyDescriptor(super).c_str(), 3125 PrettyDescriptor(klass.get()).c_str(), 3126 super->IsFinal() ? "declared final" : "an interface"); 3127 return false; 3128 } 3129 if (!klass->CanAccess(super)) { 3130 ThrowIllegalAccessError(klass.get(), "Superclass %s is inaccessible to class %s", 3131 PrettyDescriptor(super).c_str(), 3132 PrettyDescriptor(klass.get()).c_str()); 3133 return false; 3134 } 3135 3136 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3137 if (super->IsFinalizable()) { 3138 klass->SetFinalizable(); 3139 } 3140 3141 // Inherit reference flags (if any) from the superclass. 3142 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3143 if (reference_flags != 0) { 3144 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3145 } 3146 // Disallow custom direct subclasses of java.lang.ref.Reference. 3147 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3148 ThrowLinkageError(klass.get(), 3149 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3150 PrettyDescriptor(klass.get()).c_str()); 3151 return false; 3152 } 3153 3154#ifndef NDEBUG 3155 // Ensure super classes are fully resolved prior to resolving fields.. 3156 while (super != NULL) { 3157 CHECK(super->IsResolved()); 3158 super = super->GetSuperClass(); 3159 } 3160#endif 3161 return true; 3162} 3163 3164// Populate the class vtable and itable. Compute return type indices. 3165bool ClassLinker::LinkMethods(SirtRef<mirror::Class>& klass, 3166 mirror::ObjectArray<mirror::Class>* interfaces) { 3167 if (klass->IsInterface()) { 3168 // No vtable. 3169 size_t count = klass->NumVirtualMethods(); 3170 if (!IsUint(16, count)) { 3171 ThrowClassFormatError(klass.get(), "Too many methods on interface: %zd", count); 3172 return false; 3173 } 3174 for (size_t i = 0; i < count; ++i) { 3175 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3176 } 3177 // Link interface method tables 3178 return LinkInterfaceMethods(klass, interfaces); 3179 } else { 3180 // Link virtual and interface method tables 3181 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3182 } 3183 return true; 3184} 3185 3186bool ClassLinker::LinkVirtualMethods(SirtRef<mirror::Class>& klass) { 3187 Thread* self = Thread::Current(); 3188 if (klass->HasSuperClass()) { 3189 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3190 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3191 CHECK_LE(actual_count, max_count); 3192 // TODO: do not assign to the vtable field until it is fully constructed. 3193 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3194 vtable(self, klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count)); 3195 // See if any of our virtual methods override the superclass. 3196 MethodHelper local_mh(NULL, this); 3197 MethodHelper super_mh(NULL, this); 3198 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3199 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3200 local_mh.ChangeMethod(local_method); 3201 size_t j = 0; 3202 for (; j < actual_count; ++j) { 3203 mirror::ArtMethod* super_method = vtable->Get(j); 3204 super_mh.ChangeMethod(super_method); 3205 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3206 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3207 if (super_method->IsFinal()) { 3208 ThrowLinkageError(klass.get(), "Method %s overrides final method in class %s", 3209 PrettyMethod(local_method).c_str(), 3210 super_mh.GetDeclaringClassDescriptor()); 3211 return false; 3212 } 3213 vtable->Set(j, local_method); 3214 local_method->SetMethodIndex(j); 3215 break; 3216 } else { 3217 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3218 << " would have incorrectly overridden the package-private method in " 3219 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3220 } 3221 } 3222 } 3223 if (j == actual_count) { 3224 // Not overriding, append. 3225 vtable->Set(actual_count, local_method); 3226 local_method->SetMethodIndex(actual_count); 3227 actual_count += 1; 3228 } 3229 } 3230 if (!IsUint(16, actual_count)) { 3231 ThrowClassFormatError(klass.get(), "Too many methods defined on class: %zd", actual_count); 3232 return false; 3233 } 3234 // Shrink vtable if possible 3235 CHECK_LE(actual_count, max_count); 3236 if (actual_count < max_count) { 3237 vtable.reset(vtable->CopyOf(self, actual_count)); 3238 } 3239 klass->SetVTable(vtable.get()); 3240 } else { 3241 CHECK(klass.get() == GetClassRoot(kJavaLangObject)); 3242 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3243 if (!IsUint(16, num_virtual_methods)) { 3244 ThrowClassFormatError(klass.get(), "Too many methods: %d", num_virtual_methods); 3245 return false; 3246 } 3247 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3248 vtable(self, AllocArtMethodArray(self, num_virtual_methods)); 3249 for (size_t i = 0; i < num_virtual_methods; ++i) { 3250 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3251 vtable->Set(i, virtual_method); 3252 virtual_method->SetMethodIndex(i & 0xFFFF); 3253 } 3254 klass->SetVTable(vtable.get()); 3255 } 3256 return true; 3257} 3258 3259bool ClassLinker::LinkInterfaceMethods(SirtRef<mirror::Class>& klass, 3260 mirror::ObjectArray<mirror::Class>* interfaces) { 3261 size_t super_ifcount; 3262 if (klass->HasSuperClass()) { 3263 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3264 } else { 3265 super_ifcount = 0; 3266 } 3267 size_t ifcount = super_ifcount; 3268 ClassHelper kh(klass.get(), this); 3269 uint32_t num_interfaces = interfaces == NULL ? kh.NumDirectInterfaces() : interfaces->GetLength(); 3270 ifcount += num_interfaces; 3271 for (size_t i = 0; i < num_interfaces; i++) { 3272 mirror::Class* interface = interfaces == NULL ? kh.GetDirectInterface(i) : interfaces->Get(i); 3273 ifcount += interface->GetIfTableCount(); 3274 } 3275 if (ifcount == 0) { 3276 // Class implements no interfaces. 3277 DCHECK_EQ(klass->GetIfTableCount(), 0); 3278 DCHECK(klass->GetIfTable() == NULL); 3279 return true; 3280 } 3281 if (ifcount == super_ifcount) { 3282 // Class implements same interfaces as parent, are any of these not marker interfaces? 3283 bool has_non_marker_interface = false; 3284 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3285 for (size_t i = 0; i < ifcount; ++i) { 3286 if (super_iftable->GetMethodArrayCount(i) > 0) { 3287 has_non_marker_interface = true; 3288 break; 3289 } 3290 } 3291 if (!has_non_marker_interface) { 3292 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3293 klass->SetIfTable(super_iftable); 3294 return true; 3295 } 3296 } 3297 Thread* self = Thread::Current(); 3298 SirtRef<mirror::IfTable> iftable(self, AllocIfTable(self, ifcount)); 3299 if (super_ifcount != 0) { 3300 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3301 for (size_t i = 0; i < super_ifcount; i++) { 3302 mirror::Class* super_interface = super_iftable->GetInterface(i); 3303 iftable->SetInterface(i, super_interface); 3304 } 3305 } 3306 // Flatten the interface inheritance hierarchy. 3307 size_t idx = super_ifcount; 3308 for (size_t i = 0; i < num_interfaces; i++) { 3309 mirror::Class* interface = interfaces == NULL ? kh.GetDirectInterface(i) : interfaces->Get(i); 3310 DCHECK(interface != NULL); 3311 if (!interface->IsInterface()) { 3312 ClassHelper ih(interface); 3313 ThrowIncompatibleClassChangeError(klass.get(), "Class %s implements non-interface class %s", 3314 PrettyDescriptor(klass.get()).c_str(), 3315 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3316 return false; 3317 } 3318 // Check if interface is already in iftable 3319 bool duplicate = false; 3320 for (size_t j = 0; j < idx; j++) { 3321 mirror::Class* existing_interface = iftable->GetInterface(j); 3322 if (existing_interface == interface) { 3323 duplicate = true; 3324 break; 3325 } 3326 } 3327 if (!duplicate) { 3328 // Add this non-duplicate interface. 3329 iftable->SetInterface(idx++, interface); 3330 // Add this interface's non-duplicate super-interfaces. 3331 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3332 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3333 bool super_duplicate = false; 3334 for (size_t k = 0; k < idx; k++) { 3335 mirror::Class* existing_interface = iftable->GetInterface(k); 3336 if (existing_interface == super_interface) { 3337 super_duplicate = true; 3338 break; 3339 } 3340 } 3341 if (!super_duplicate) { 3342 iftable->SetInterface(idx++, super_interface); 3343 } 3344 } 3345 } 3346 } 3347 // Shrink iftable in case duplicates were found 3348 if (idx < ifcount) { 3349 iftable.reset(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3350 ifcount = idx; 3351 } else { 3352 CHECK_EQ(idx, ifcount); 3353 } 3354 klass->SetIfTable(iftable.get()); 3355 3356 // If we're an interface, we don't need the vtable pointers, so we're done. 3357 if (klass->IsInterface()) { 3358 return true; 3359 } 3360 std::vector<mirror::ArtMethod*> miranda_list; 3361 MethodHelper vtable_mh(NULL, this); 3362 MethodHelper interface_mh(NULL, this); 3363 for (size_t i = 0; i < ifcount; ++i) { 3364 mirror::Class* interface = iftable->GetInterface(i); 3365 size_t num_methods = interface->NumVirtualMethods(); 3366 if (num_methods > 0) { 3367 mirror::ObjectArray<mirror::ArtMethod>* method_array = 3368 AllocArtMethodArray(self, num_methods); 3369 iftable->SetMethodArray(i, method_array); 3370 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3371 for (size_t j = 0; j < num_methods; ++j) { 3372 mirror::ArtMethod* interface_method = interface->GetVirtualMethod(j); 3373 interface_mh.ChangeMethod(interface_method); 3374 int32_t k; 3375 // For each method listed in the interface's method list, find the 3376 // matching method in our class's method list. We want to favor the 3377 // subclass over the superclass, which just requires walking 3378 // back from the end of the vtable. (This only matters if the 3379 // superclass defines a private method and this class redefines 3380 // it -- otherwise it would use the same vtable slot. In .dex files 3381 // those don't end up in the virtual method table, so it shouldn't 3382 // matter which direction we go. We walk it backward anyway.) 3383 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3384 mirror::ArtMethod* vtable_method = vtable->Get(k); 3385 vtable_mh.ChangeMethod(vtable_method); 3386 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3387 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3388 ThrowIllegalAccessError(klass.get(), 3389 "Method '%s' implementing interface method '%s' is not public", 3390 PrettyMethod(vtable_method).c_str(), 3391 PrettyMethod(interface_method).c_str()); 3392 return false; 3393 } 3394 method_array->Set(j, vtable_method); 3395 break; 3396 } 3397 } 3398 if (k < 0) { 3399 SirtRef<mirror::ArtMethod> miranda_method(self, NULL); 3400 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3401 mirror::ArtMethod* mir_method = miranda_list[mir]; 3402 vtable_mh.ChangeMethod(mir_method); 3403 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3404 miranda_method.reset(miranda_list[mir]); 3405 break; 3406 } 3407 } 3408 if (miranda_method.get() == NULL) { 3409 // point the interface table at a phantom slot 3410 miranda_method.reset(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3411 miranda_list.push_back(miranda_method.get()); 3412 } 3413 method_array->Set(j, miranda_method.get()); 3414 } 3415 } 3416 } 3417 } 3418 if (!miranda_list.empty()) { 3419 int old_method_count = klass->NumVirtualMethods(); 3420 int new_method_count = old_method_count + miranda_list.size(); 3421 klass->SetVirtualMethods((old_method_count == 0) 3422 ? AllocArtMethodArray(self, new_method_count) 3423 : klass->GetVirtualMethods()->CopyOf(self, new_method_count)); 3424 3425 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3426 vtable(self, klass->GetVTableDuringLinking()); 3427 CHECK(vtable.get() != NULL); 3428 int old_vtable_count = vtable->GetLength(); 3429 int new_vtable_count = old_vtable_count + miranda_list.size(); 3430 vtable.reset(vtable->CopyOf(self, new_vtable_count)); 3431 for (size_t i = 0; i < miranda_list.size(); ++i) { 3432 mirror::ArtMethod* method = miranda_list[i]; 3433 // Leave the declaring class alone as type indices are relative to it 3434 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3435 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3436 klass->SetVirtualMethod(old_method_count + i, method); 3437 vtable->Set(old_vtable_count + i, method); 3438 } 3439 // TODO: do not assign to the vtable field until it is fully constructed. 3440 klass->SetVTable(vtable.get()); 3441 } 3442 3443 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3444 for (int i = 0; i < vtable->GetLength(); ++i) { 3445 CHECK(vtable->Get(i) != NULL); 3446 } 3447 3448// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3449 3450 return true; 3451} 3452 3453bool ClassLinker::LinkInstanceFields(SirtRef<mirror::Class>& klass) { 3454 CHECK(klass.get() != NULL); 3455 return LinkFields(klass, false); 3456} 3457 3458bool ClassLinker::LinkStaticFields(SirtRef<mirror::Class>& klass) { 3459 CHECK(klass.get() != NULL); 3460 size_t allocated_class_size = klass->GetClassSize(); 3461 bool success = LinkFields(klass, true); 3462 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3463 return success; 3464} 3465 3466struct LinkFieldsComparator { 3467 explicit LinkFieldsComparator(FieldHelper* fh) 3468 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 3469 : fh_(fh) {} 3470 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3471 bool operator()(const mirror::ArtField* field1, const mirror::ArtField* field2) 3472 NO_THREAD_SAFETY_ANALYSIS { 3473 // First come reference fields, then 64-bit, and finally 32-bit 3474 fh_->ChangeField(field1); 3475 Primitive::Type type1 = fh_->GetTypeAsPrimitiveType(); 3476 fh_->ChangeField(field2); 3477 Primitive::Type type2 = fh_->GetTypeAsPrimitiveType(); 3478 bool isPrimitive1 = type1 != Primitive::kPrimNot; 3479 bool isPrimitive2 = type2 != Primitive::kPrimNot; 3480 bool is64bit1 = isPrimitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3481 bool is64bit2 = isPrimitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3482 int order1 = (!isPrimitive1 ? 0 : (is64bit1 ? 1 : 2)); 3483 int order2 = (!isPrimitive2 ? 0 : (is64bit2 ? 1 : 2)); 3484 if (order1 != order2) { 3485 return order1 < order2; 3486 } 3487 3488 // same basic group? then sort by string. 3489 fh_->ChangeField(field1); 3490 StringPiece name1(fh_->GetName()); 3491 fh_->ChangeField(field2); 3492 StringPiece name2(fh_->GetName()); 3493 return name1 < name2; 3494 } 3495 3496 FieldHelper* fh_; 3497}; 3498 3499bool ClassLinker::LinkFields(SirtRef<mirror::Class>& klass, bool is_static) { 3500 size_t num_fields = 3501 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3502 3503 mirror::ObjectArray<mirror::ArtField>* fields = 3504 is_static ? klass->GetSFields() : klass->GetIFields(); 3505 3506 // Initialize size and field_offset 3507 size_t size; 3508 MemberOffset field_offset(0); 3509 if (is_static) { 3510 size = klass->GetClassSize(); 3511 field_offset = mirror::Class::FieldsOffset(); 3512 } else { 3513 mirror::Class* super_class = klass->GetSuperClass(); 3514 if (super_class != NULL) { 3515 CHECK(super_class->IsResolved()); 3516 field_offset = MemberOffset(super_class->GetObjectSize()); 3517 } 3518 size = field_offset.Uint32Value(); 3519 } 3520 3521 CHECK_EQ(num_fields == 0, fields == NULL); 3522 3523 // we want a relatively stable order so that adding new fields 3524 // minimizes disruption of C++ version such as Class and Method. 3525 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3526 for (size_t i = 0; i < num_fields; i++) { 3527 grouped_and_sorted_fields.push_back(fields->Get(i)); 3528 } 3529 FieldHelper fh(NULL, this); 3530 std::sort(grouped_and_sorted_fields.begin(), 3531 grouped_and_sorted_fields.end(), 3532 LinkFieldsComparator(&fh)); 3533 3534 // References should be at the front. 3535 size_t current_field = 0; 3536 size_t num_reference_fields = 0; 3537 for (; current_field < num_fields; current_field++) { 3538 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3539 fh.ChangeField(field); 3540 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3541 bool isPrimitive = type != Primitive::kPrimNot; 3542 if (isPrimitive) { 3543 break; // past last reference, move on to the next phase 3544 } 3545 grouped_and_sorted_fields.pop_front(); 3546 num_reference_fields++; 3547 fields->Set(current_field, field); 3548 field->SetOffset(field_offset); 3549 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3550 } 3551 3552 // Now we want to pack all of the double-wide fields together. If 3553 // we're not aligned, though, we want to shuffle one 32-bit field 3554 // into place. If we can't find one, we'll have to pad it. 3555 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3556 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3557 mirror::ArtField* field = grouped_and_sorted_fields[i]; 3558 fh.ChangeField(field); 3559 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3560 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3561 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 3562 continue; 3563 } 3564 fields->Set(current_field++, field); 3565 field->SetOffset(field_offset); 3566 // drop the consumed field 3567 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 3568 break; 3569 } 3570 // whether we found a 32-bit field for padding or not, we advance 3571 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3572 } 3573 3574 // Alignment is good, shuffle any double-wide fields forward, and 3575 // finish assigning field offsets to all fields. 3576 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 3577 while (!grouped_and_sorted_fields.empty()) { 3578 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3579 grouped_and_sorted_fields.pop_front(); 3580 fh.ChangeField(field); 3581 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3582 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3583 fields->Set(current_field, field); 3584 field->SetOffset(field_offset); 3585 field_offset = MemberOffset(field_offset.Uint32Value() + 3586 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 3587 ? sizeof(uint64_t) 3588 : sizeof(uint32_t))); 3589 current_field++; 3590 } 3591 3592 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 3593 if (!is_static && 3594 StringPiece(ClassHelper(klass.get(), this).GetDescriptor()) == "Ljava/lang/ref/Reference;") { 3595 // We know there are no non-reference fields in the Reference classes, and we know 3596 // that 'referent' is alphabetically last, so this is easy... 3597 CHECK_EQ(num_reference_fields, num_fields); 3598 fh.ChangeField(fields->Get(num_fields - 1)); 3599 CHECK_STREQ(fh.GetName(), "referent"); 3600 --num_reference_fields; 3601 } 3602 3603#ifndef NDEBUG 3604 // Make sure that all reference fields appear before 3605 // non-reference fields, and all double-wide fields are aligned. 3606 bool seen_non_ref = false; 3607 for (size_t i = 0; i < num_fields; i++) { 3608 mirror::ArtField* field = fields->Get(i); 3609 if (false) { // enable to debug field layout 3610 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 3611 << " class=" << PrettyClass(klass.get()) 3612 << " field=" << PrettyField(field) 3613 << " offset=" << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset()), 3614 false); 3615 } 3616 fh.ChangeField(field); 3617 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3618 bool is_primitive = type != Primitive::kPrimNot; 3619 if (StringPiece(ClassHelper(klass.get(), this).GetDescriptor()) == "Ljava/lang/ref/Reference;" && 3620 StringPiece(fh.GetName()) == "referent") { 3621 is_primitive = true; // We lied above, so we have to expect a lie here. 3622 } 3623 if (is_primitive) { 3624 if (!seen_non_ref) { 3625 seen_non_ref = true; 3626 DCHECK_EQ(num_reference_fields, i); 3627 } 3628 } else { 3629 DCHECK(!seen_non_ref); 3630 } 3631 } 3632 if (!seen_non_ref) { 3633 DCHECK_EQ(num_fields, num_reference_fields); 3634 } 3635#endif 3636 size = field_offset.Uint32Value(); 3637 // Update klass 3638 if (is_static) { 3639 klass->SetNumReferenceStaticFields(num_reference_fields); 3640 klass->SetClassSize(size); 3641 } else { 3642 klass->SetNumReferenceInstanceFields(num_reference_fields); 3643 if (!klass->IsVariableSize()) { 3644 DCHECK_GE(size, sizeof(mirror::Object)) << ClassHelper(klass.get(), this).GetDescriptor(); 3645 klass->SetObjectSize(size); 3646 } 3647 } 3648 return true; 3649} 3650 3651// Set the bitmap of reference offsets, refOffsets, from the ifields 3652// list. 3653void ClassLinker::CreateReferenceInstanceOffsets(SirtRef<mirror::Class>& klass) { 3654 uint32_t reference_offsets = 0; 3655 mirror::Class* super_class = klass->GetSuperClass(); 3656 if (super_class != NULL) { 3657 reference_offsets = super_class->GetReferenceInstanceOffsets(); 3658 // If our superclass overflowed, we don't stand a chance. 3659 if (reference_offsets == CLASS_WALK_SUPER) { 3660 klass->SetReferenceInstanceOffsets(reference_offsets); 3661 return; 3662 } 3663 } 3664 CreateReferenceOffsets(klass, false, reference_offsets); 3665} 3666 3667void ClassLinker::CreateReferenceStaticOffsets(SirtRef<mirror::Class>& klass) { 3668 CreateReferenceOffsets(klass, true, 0); 3669} 3670 3671void ClassLinker::CreateReferenceOffsets(SirtRef<mirror::Class>& klass, bool is_static, 3672 uint32_t reference_offsets) { 3673 size_t num_reference_fields = 3674 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 3675 : klass->NumReferenceInstanceFieldsDuringLinking(); 3676 const mirror::ObjectArray<mirror::ArtField>* fields = 3677 is_static ? klass->GetSFields() : klass->GetIFields(); 3678 // All of the fields that contain object references are guaranteed 3679 // to be at the beginning of the fields list. 3680 for (size_t i = 0; i < num_reference_fields; ++i) { 3681 // Note that byte_offset is the offset from the beginning of 3682 // object, not the offset into instance data 3683 const mirror::ArtField* field = fields->Get(i); 3684 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 3685 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 3686 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 3687 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 3688 CHECK_NE(new_bit, 0U); 3689 reference_offsets |= new_bit; 3690 } else { 3691 reference_offsets = CLASS_WALK_SUPER; 3692 break; 3693 } 3694 } 3695 // Update fields in klass 3696 if (is_static) { 3697 klass->SetReferenceStaticOffsets(reference_offsets); 3698 } else { 3699 klass->SetReferenceInstanceOffsets(reference_offsets); 3700 } 3701} 3702 3703mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, 3704 uint32_t string_idx, mirror::DexCache* dex_cache) { 3705 DCHECK(dex_cache != NULL); 3706 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 3707 if (resolved != NULL) { 3708 return resolved; 3709 } 3710 const DexFile::StringId& string_id = dex_file.GetStringId(string_idx); 3711 int32_t utf16_length = dex_file.GetStringLength(string_id); 3712 const char* utf8_data = dex_file.GetStringData(string_id); 3713 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 3714 dex_cache->SetResolvedString(string_idx, string); 3715 return string; 3716} 3717 3718mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, 3719 uint16_t type_idx, 3720 mirror::DexCache* dex_cache, 3721 mirror::ClassLoader* class_loader) { 3722 DCHECK(dex_cache != NULL); 3723 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 3724 if (resolved == NULL) { 3725 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 3726 resolved = FindClass(descriptor, class_loader); 3727 if (resolved != NULL) { 3728 // TODO: we used to throw here if resolved's class loader was not the 3729 // boot class loader. This was to permit different classes with the 3730 // same name to be loaded simultaneously by different loaders 3731 dex_cache->SetResolvedType(type_idx, resolved); 3732 } else { 3733 Thread* self = Thread::Current(); 3734 CHECK(self->IsExceptionPending()) 3735 << "Expected pending exception for failed resolution of: " << descriptor; 3736 // Convert a ClassNotFoundException to a NoClassDefFoundError. 3737 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 3738 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 3739 Thread::Current()->ClearException(); 3740 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 3741 self->GetException(NULL)->SetCause(cause.get()); 3742 } 3743 } 3744 } 3745 return resolved; 3746} 3747 3748mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 3749 uint32_t method_idx, 3750 mirror::DexCache* dex_cache, 3751 mirror::ClassLoader* class_loader, 3752 const mirror::ArtMethod* referrer, 3753 InvokeType type) { 3754 DCHECK(dex_cache != NULL); 3755 // Check for hit in the dex cache. 3756 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 3757 if (resolved != NULL) { 3758 return resolved; 3759 } 3760 // Fail, get the declaring class. 3761 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 3762 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 3763 if (klass == NULL) { 3764 DCHECK(Thread::Current()->IsExceptionPending()); 3765 return NULL; 3766 } 3767 // Scan using method_idx, this saves string compares but will only hit for matching dex 3768 // caches/files. 3769 switch (type) { 3770 case kDirect: // Fall-through. 3771 case kStatic: 3772 resolved = klass->FindDirectMethod(dex_cache, method_idx); 3773 break; 3774 case kInterface: 3775 resolved = klass->FindInterfaceMethod(dex_cache, method_idx); 3776 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 3777 break; 3778 case kSuper: // Fall-through. 3779 case kVirtual: 3780 resolved = klass->FindVirtualMethod(dex_cache, method_idx); 3781 break; 3782 default: 3783 LOG(FATAL) << "Unreachable - invocation type: " << type; 3784 } 3785 if (resolved == NULL) { 3786 // Search by name, which works across dex files. 3787 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 3788 std::string signature(dex_file.CreateMethodSignature(method_id.proto_idx_, NULL)); 3789 switch (type) { 3790 case kDirect: // Fall-through. 3791 case kStatic: 3792 resolved = klass->FindDirectMethod(name, signature); 3793 break; 3794 case kInterface: 3795 resolved = klass->FindInterfaceMethod(name, signature); 3796 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 3797 break; 3798 case kSuper: // Fall-through. 3799 case kVirtual: 3800 resolved = klass->FindVirtualMethod(name, signature); 3801 break; 3802 } 3803 } 3804 if (resolved != NULL) { 3805 // We found a method, check for incompatible class changes. 3806 if (resolved->CheckIncompatibleClassChange(type)) { 3807 resolved = NULL; 3808 } 3809 } 3810 if (resolved != NULL) { 3811 // Be a good citizen and update the dex cache to speed subsequent calls. 3812 dex_cache->SetResolvedMethod(method_idx, resolved); 3813 return resolved; 3814 } else { 3815 // We failed to find the method which means either an access error, an incompatible class 3816 // change, or no such method. First try to find the method among direct and virtual methods. 3817 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 3818 std::string signature(dex_file.CreateMethodSignature(method_id.proto_idx_, NULL)); 3819 switch (type) { 3820 case kDirect: 3821 case kStatic: 3822 resolved = klass->FindVirtualMethod(name, signature); 3823 break; 3824 case kInterface: 3825 case kVirtual: 3826 case kSuper: 3827 resolved = klass->FindDirectMethod(name, signature); 3828 break; 3829 } 3830 3831 // If we found something, check that it can be accessed by the referrer. 3832 if (resolved != NULL && referrer != NULL) { 3833 mirror::Class* methods_class = resolved->GetDeclaringClass(); 3834 mirror::Class* referring_class = referrer->GetDeclaringClass(); 3835 if (!referring_class->CanAccess(methods_class)) { 3836 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 3837 referrer, resolved, type); 3838 return NULL; 3839 } else if (!referring_class->CanAccessMember(methods_class, 3840 resolved->GetAccessFlags())) { 3841 ThrowIllegalAccessErrorMethod(referring_class, resolved); 3842 return NULL; 3843 } 3844 } 3845 3846 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 3847 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 3848 switch (type) { 3849 case kDirect: 3850 case kStatic: 3851 if (resolved != NULL) { 3852 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 3853 } else { 3854 resolved = klass->FindInterfaceMethod(name, signature); 3855 if (resolved != NULL) { 3856 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 3857 } else { 3858 ThrowNoSuchMethodError(type, klass, name, signature); 3859 } 3860 } 3861 break; 3862 case kInterface: 3863 if (resolved != NULL) { 3864 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 3865 } else { 3866 resolved = klass->FindVirtualMethod(name, signature); 3867 if (resolved != NULL) { 3868 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 3869 } else { 3870 ThrowNoSuchMethodError(type, klass, name, signature); 3871 } 3872 } 3873 break; 3874 case kSuper: 3875 ThrowNoSuchMethodError(type, klass, name, signature); 3876 break; 3877 case kVirtual: 3878 if (resolved != NULL) { 3879 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 3880 } else { 3881 resolved = klass->FindInterfaceMethod(name, signature); 3882 if (resolved != NULL) { 3883 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 3884 } else { 3885 ThrowNoSuchMethodError(type, klass, name, signature); 3886 } 3887 } 3888 break; 3889 } 3890 DCHECK(Thread::Current()->IsExceptionPending()); 3891 return NULL; 3892 } 3893} 3894 3895mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, 3896 uint32_t field_idx, 3897 mirror::DexCache* dex_cache, 3898 mirror::ClassLoader* class_loader, 3899 bool is_static) { 3900 DCHECK(dex_cache != NULL); 3901 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 3902 if (resolved != NULL) { 3903 return resolved; 3904 } 3905 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 3906 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 3907 if (klass == NULL) { 3908 DCHECK(Thread::Current()->IsExceptionPending()); 3909 return NULL; 3910 } 3911 3912 if (is_static) { 3913 resolved = klass->FindStaticField(dex_cache, field_idx); 3914 } else { 3915 resolved = klass->FindInstanceField(dex_cache, field_idx); 3916 } 3917 3918 if (resolved == NULL) { 3919 const char* name = dex_file.GetFieldName(field_id); 3920 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 3921 if (is_static) { 3922 resolved = klass->FindStaticField(name, type); 3923 } else { 3924 resolved = klass->FindInstanceField(name, type); 3925 } 3926 if (resolved == NULL) { 3927 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 3928 return NULL; 3929 } 3930 } 3931 dex_cache->SetResolvedField(field_idx, resolved); 3932 return resolved; 3933} 3934 3935mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 3936 uint32_t field_idx, 3937 mirror::DexCache* dex_cache, 3938 mirror::ClassLoader* class_loader) { 3939 DCHECK(dex_cache != NULL); 3940 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 3941 if (resolved != NULL) { 3942 return resolved; 3943 } 3944 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 3945 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 3946 if (klass == NULL) { 3947 DCHECK(Thread::Current()->IsExceptionPending()); 3948 return NULL; 3949 } 3950 3951 const char* name = dex_file.GetFieldName(field_id); 3952 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 3953 resolved = klass->FindField(name, type); 3954 if (resolved != NULL) { 3955 dex_cache->SetResolvedField(field_idx, resolved); 3956 } else { 3957 ThrowNoSuchFieldError("", klass, type, name); 3958 } 3959 return resolved; 3960} 3961 3962const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 3963 uint32_t* length) { 3964 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 3965 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 3966 const DexFile& dex_file = *dex_cache->GetDexFile(); 3967 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 3968 return dex_file.GetMethodShorty(method_id, length); 3969} 3970 3971void ClassLinker::DumpAllClasses(int flags) const { 3972 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 3973 // lock held, because it might need to resolve a field's type, which would try to take the lock. 3974 std::vector<mirror::Class*> all_classes; 3975 { 3976 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3977 typedef Table::const_iterator It; // TODO: C++0x auto 3978 for (It it = classes_.begin(), end = classes_.end(); it != end; ++it) { 3979 all_classes.push_back(it->second); 3980 } 3981 for (It it = image_classes_.begin(), end = image_classes_.end(); it != end; ++it) { 3982 all_classes.push_back(it->second); 3983 } 3984 } 3985 3986 for (size_t i = 0; i < all_classes.size(); ++i) { 3987 all_classes[i]->DumpClass(std::cerr, flags); 3988 } 3989} 3990 3991void ClassLinker::DumpForSigQuit(std::ostream& os) const { 3992 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3993 os << "Loaded classes: " << image_classes_.size() << " image classes; " 3994 << classes_.size() << " allocated classes\n"; 3995} 3996 3997size_t ClassLinker::NumLoadedClasses() const { 3998 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3999 return classes_.size() + image_classes_.size(); 4000} 4001 4002pid_t ClassLinker::GetClassesLockOwner() { 4003 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4004} 4005 4006pid_t ClassLinker::GetDexLockOwner() { 4007 return dex_lock_.GetExclusiveOwnerTid(); 4008} 4009 4010void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4011 DCHECK(!init_done_); 4012 4013 DCHECK(klass != NULL); 4014 DCHECK(klass->GetClassLoader() == NULL); 4015 4016 DCHECK(class_roots_ != NULL); 4017 DCHECK(class_roots_->Get(class_root) == NULL); 4018 class_roots_->Set(class_root, klass); 4019} 4020 4021} // namespace art 4022