class_linker.cc revision 6d3f72ce67d012318dee23c86a7464a9440fabff
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::kSpace: 579 oat_compiler_filter_string += "space"; 580 break; 581 case Runtime::kBalanced: 582 oat_compiler_filter_string += "balanced"; 583 break; 584 case Runtime::kSpeed: 585 oat_compiler_filter_string += "speed"; 586 break; 587 case Runtime::kEverything: 588 oat_compiler_filter_string += "everything"; 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 if (file_.get() != NULL) { 786 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_UN)); 787 CHECK_EQ(0, flock_result); 788 } 789 } 790 791 private: 792 UniquePtr<File> file_; 793 794 DISALLOW_COPY_AND_ASSIGN(ScopedFlock); 795}; 796 797const DexFile* ClassLinker::FindOrCreateOatFileForDexLocationLocked(const std::string& dex_location, 798 const std::string& oat_location) { 799 uint32_t dex_location_checksum; 800 if (!DexFile::GetChecksum(dex_location, dex_location_checksum)) { 801 LOG(ERROR) << "Failed to compute checksum '" << dex_location << "'"; 802 return NULL; 803 } 804 805 // We play a locking game here so that if two different processes 806 // race to generate (or worse, one tries to open a partial generated 807 // file) we will be okay. This is actually common with apps that use 808 // DexClassLoader to work around the dex method reference limit and 809 // that have a background service running in a separate process. 810 ScopedFlock scoped_flock; 811 if (!scoped_flock.Init(oat_location)) { 812 LOG(ERROR) << "Failed to open locked oat file: " << oat_location; 813 return NULL; 814 } 815 816 // Check if we already have an up-to-date output file 817 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, 818 dex_location_checksum, 819 oat_location); 820 if (dex_file != NULL) { 821 return dex_file; 822 } 823 824 // Generate the output oat file for the dex file 825 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 826 if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location)) { 827 LOG(ERROR) << "Failed to generate oat file: " << oat_location; 828 return NULL; 829 } 830 const OatFile* oat_file = OatFile::Open(oat_location, oat_location, NULL, 831 !Runtime::Current()->IsCompiler()); 832 if (oat_file == NULL) { 833 LOG(ERROR) << "Failed to open generated oat file: " << oat_location; 834 return NULL; 835 } 836 RegisterOatFileLocked(*oat_file); 837 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location); 838 if (oat_dex_file == NULL) { 839 LOG(ERROR) << "Failed to find dex file in generated oat file: " << oat_location; 840 return NULL; 841 } 842 return oat_dex_file->OpenDexFile(); 843} 844 845bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 846 const std::string& dex_location, 847 uint32_t dex_location_checksum) { 848 Runtime* runtime = Runtime::Current(); 849 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 850 uint32_t image_oat_checksum = image_header.GetOatChecksum(); 851 uint32_t image_oat_data_begin = reinterpret_cast<uint32_t>(image_header.GetOatDataBegin()); 852 bool image_check = ((oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum) 853 && (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 854 855 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location); 856 if (oat_dex_file == NULL) { 857 LOG(ERROR) << "oat file " << oat_file->GetLocation() 858 << " does not contain contents for " << dex_location; 859 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 860 for (size_t i = 0; i < oat_dex_files.size(); i++) { 861 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 862 LOG(ERROR) << "oat file " << oat_file->GetLocation() 863 << " contains contents for " << oat_dex_file->GetDexFileLocation(); 864 } 865 return false; 866 } 867 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 868 869 if (image_check && dex_check) { 870 return true; 871 } 872 873 if (!image_check) { 874 std::string image_file(image_header.GetImageRoot( 875 ImageHeader::kOatLocation)->AsString()->ToModifiedUtf8()); 876 LOG(WARNING) << "oat file " << oat_file->GetLocation() 877 << " mismatch ( " << std::hex << oat_file->GetOatHeader().GetImageFileLocationOatChecksum() 878 << ", " << oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() 879 << ") with " << image_file 880 << " (" << image_oat_checksum << ", " << std::hex << image_oat_data_begin << ")"; 881 } 882 if (!dex_check) { 883 LOG(WARNING) << "oat file " << oat_file->GetLocation() 884 << " mismatch ( " << std::hex << oat_dex_file->GetDexFileLocationChecksum() 885 << ") with " << dex_location 886 << " (" << std::hex << dex_location_checksum << ")"; 887 } 888 return false; 889} 890 891const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const OatFile* oat_file, 892 const std::string& dex_location, 893 uint32_t dex_location_checksum) { 894 bool verified = VerifyOatFileChecksums(oat_file, dex_location, dex_location_checksum); 895 if (!verified) { 896 return NULL; 897 } 898 RegisterOatFileLocked(*oat_file); 899 return oat_file->GetOatDexFile(dex_location)->OpenDexFile(); 900} 901 902const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const std::string& dex_location) { 903 WriterMutexLock mu(Thread::Current(), dex_lock_); 904 905 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location); 906 if (open_oat_file != NULL) { 907 return open_oat_file->GetOatDexFile(dex_location)->OpenDexFile(); 908 } 909 910 // Look for an existing file next to dex. for example, for 911 // /foo/bar/baz.jar, look for /foo/bar/baz.odex. 912 std::string odex_filename(OatFile::DexFilenameToOdexFilename(dex_location)); 913 const OatFile* oat_file = FindOatFileFromOatLocationLocked(odex_filename); 914 if (oat_file != NULL) { 915 uint32_t dex_location_checksum; 916 if (!DexFile::GetChecksum(dex_location, dex_location_checksum)) { 917 // If no classes.dex found in dex_location, it has been stripped, assume oat is up-to-date. 918 // This is the common case in user builds for jar's and apk's in the /system directory. 919 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location); 920 CHECK(oat_dex_file != NULL) << odex_filename << " " << dex_location; 921 RegisterOatFileLocked(*oat_file); 922 return oat_dex_file->OpenDexFile(); 923 } 924 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(oat_file, 925 dex_location, 926 dex_location_checksum); 927 if (dex_file != NULL) { 928 return dex_file; 929 } 930 } 931 // Look for an existing file in the dalvik-cache, validating the result if found 932 // not found in /foo/bar/baz.odex? try /data/dalvik-cache/foo@bar@baz.jar@classes.dex 933 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location)); 934 oat_file = FindOatFileFromOatLocationLocked(cache_location); 935 if (oat_file != NULL) { 936 uint32_t dex_location_checksum; 937 if (!DexFile::GetChecksum(dex_location, dex_location_checksum)) { 938 LOG(WARNING) << "Failed to compute checksum: " << dex_location; 939 return NULL; 940 } 941 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(oat_file, 942 dex_location, 943 dex_location_checksum); 944 if (dex_file != NULL) { 945 return dex_file; 946 } 947 if (TEMP_FAILURE_RETRY(unlink(oat_file->GetLocation().c_str())) != 0) { 948 PLOG(FATAL) << "Failed to remove obsolete oat file " << oat_file->GetLocation(); 949 } 950 } 951 LOG(INFO) << "Failed to open oat file from " << odex_filename << " or " << cache_location << "."; 952 953 // Try to generate oat file if it wasn't found or was obsolete. 954 std::string oat_cache_filename(GetDalvikCacheFilenameOrDie(dex_location)); 955 return FindOrCreateOatFileForDexLocationLocked(dex_location, oat_cache_filename); 956} 957 958const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 959 for (size_t i = 0; i < oat_files_.size(); i++) { 960 const OatFile* oat_file = oat_files_[i]; 961 DCHECK(oat_file != NULL); 962 if (oat_file->GetLocation() == oat_location) { 963 return oat_file; 964 } 965 } 966 return NULL; 967} 968 969const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location) { 970 ReaderMutexLock mu(Thread::Current(), dex_lock_); 971 return FindOatFileFromOatLocationLocked(oat_location); 972} 973 974const OatFile* ClassLinker::FindOatFileFromOatLocationLocked(const std::string& oat_location) { 975 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 976 if (oat_file != NULL) { 977 return oat_file; 978 } 979 980 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler()); 981 if (oat_file == NULL) { 982 return NULL; 983 } 984 return oat_file; 985} 986 987static void InitFromImageCallbackCommon(mirror::Object* obj, ClassLinker* class_linker, 988 bool interpret_only_mode) 989 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 990 DCHECK(obj != NULL); 991 DCHECK(class_linker != NULL); 992 993 if (obj->GetClass()->IsStringClass()) { 994 class_linker->GetInternTable()->RegisterStrong(obj->AsString()); 995 } else if (obj->IsClass()) { 996 // Restore class to ClassLinker::classes_ table. 997 mirror::Class* klass = obj->AsClass(); 998 ClassHelper kh(klass, class_linker); 999 mirror::Class* existing = class_linker->InsertClass(kh.GetDescriptor(), klass, true); 1000 DCHECK(existing == NULL) << kh.GetDescriptor(); 1001 } else if (interpret_only_mode && obj->IsArtMethod()) { 1002 mirror::ArtMethod* method = obj->AsArtMethod(); 1003 if (!method->IsNative()) { 1004 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1005 if (method != Runtime::Current()->GetResolutionMethod()) { 1006 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1007 } 1008 } 1009 } 1010} 1011 1012static void InitFromImageCallback(mirror::Object* obj, void* arg) 1013 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1014 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1015 InitFromImageCallbackCommon(obj, class_linker, false); 1016} 1017 1018static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1019 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1020 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1021 InitFromImageCallbackCommon(obj, class_linker, true); 1022} 1023 1024void ClassLinker::InitFromImage() { 1025 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1026 CHECK(!init_done_); 1027 1028 gc::Heap* heap = Runtime::Current()->GetHeap(); 1029 gc::space::ImageSpace* space = heap->GetImageSpace(); 1030 CHECK(space != NULL); 1031 OatFile& oat_file = GetImageOatFile(space); 1032 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1033 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1034 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 1035 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1036 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1037 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1038 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1039 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1040 1041 mirror::ObjectArray<mirror::Class>* class_roots = 1042 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>(); 1043 class_roots_ = class_roots; 1044 1045 // Special case of setting up the String class early so that we can test arbitrary objects 1046 // as being Strings or not 1047 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1048 1049 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1050 static_cast<uint32_t>(dex_caches->GetLength())); 1051 Thread* self = Thread::Current(); 1052 for (int i = 0; i < dex_caches->GetLength(); i++) { 1053 SirtRef<mirror::DexCache> dex_cache(self, dex_caches->Get(i)); 1054 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1055 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location); 1056 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1057 const DexFile* dex_file = oat_dex_file->OpenDexFile(); 1058 if (dex_file == NULL) { 1059 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1060 << " from within oat file " << oat_file.GetLocation(); 1061 } 1062 1063 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1064 1065 AppendToBootClassPath(*dex_file, dex_cache); 1066 } 1067 1068 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1069 // bitmap walk. 1070 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1071 1072 // reinit clases_ table 1073 { 1074 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1075 heap->FlushAllocStack(); 1076 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1077 heap->GetLiveBitmap()->Walk(InitFromImageInterpretOnlyCallback, this); 1078 } else { 1079 heap->GetLiveBitmap()->Walk(InitFromImageCallback, this); 1080 } 1081 } 1082 1083 // reinit class_roots_ 1084 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1085 class_roots_ = class_roots; 1086 1087 // reinit array_iftable_ from any array class instance, they should be == 1088 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1089 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1090 // String class root was set above 1091 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1092 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1093 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1094 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1095 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1096 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1097 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1098 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1099 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1100 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1101 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1102 1103 FinishInit(); 1104 1105 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1106} 1107 1108// Keep in sync with InitCallback. Anything we visit, we need to 1109// reinit references to when reinitializing a ClassLinker from a 1110// mapped image. 1111void ClassLinker::VisitRoots(RootVisitor* visitor, void* arg, bool clean_dirty) { 1112 visitor(class_roots_, arg); 1113 Thread* self = Thread::Current(); 1114 { 1115 ReaderMutexLock mu(self, dex_lock_); 1116 for (mirror::DexCache* dex_cache : dex_caches_) { 1117 visitor(dex_cache, arg); 1118 } 1119 } 1120 1121 { 1122 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 1123 for (const std::pair<size_t, mirror::Class*>& it : classes_) { 1124 visitor(it.second, arg); 1125 } 1126 1127 // We deliberately ignore the class roots in the image since we 1128 // handle image roots by using the MS/CMS rescanning of dirty cards. 1129 } 1130 1131 visitor(array_iftable_, arg); 1132 if (clean_dirty) { 1133 is_dirty_ = false; 1134 } 1135} 1136 1137void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) const { 1138 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1139 for (const std::pair<size_t, mirror::Class*>& it : classes_) { 1140 if (!visitor(it.second, arg)) { 1141 return; 1142 } 1143 } 1144 for (const std::pair<size_t, mirror::Class*>& it : image_classes_) { 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 for (mirror::Class* klass : classes) { 1161 if (!visitor(klass, arg)) { 1162 return; 1163 } 1164 } 1165} 1166 1167 1168ClassLinker::~ClassLinker() { 1169 mirror::Class::ResetClass(); 1170 mirror::String::ResetClass(); 1171 mirror::ArtField::ResetClass(); 1172 mirror::ArtMethod::ResetClass(); 1173 mirror::BooleanArray::ResetArrayClass(); 1174 mirror::ByteArray::ResetArrayClass(); 1175 mirror::CharArray::ResetArrayClass(); 1176 mirror::DoubleArray::ResetArrayClass(); 1177 mirror::FloatArray::ResetArrayClass(); 1178 mirror::IntArray::ResetArrayClass(); 1179 mirror::LongArray::ResetArrayClass(); 1180 mirror::ShortArray::ResetArrayClass(); 1181 mirror::Throwable::ResetClass(); 1182 mirror::StackTraceElement::ResetClass(); 1183 STLDeleteElements(&boot_class_path_); 1184 STLDeleteElements(&oat_files_); 1185} 1186 1187mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1188 gc::Heap* heap = Runtime::Current()->GetHeap(); 1189 mirror::Class* dex_cache_class = GetClassRoot(kJavaLangDexCache); 1190 SirtRef<mirror::DexCache> dex_cache(self, 1191 down_cast<mirror::DexCache*>(heap->AllocObject(self, dex_cache_class, 1192 dex_cache_class->GetObjectSize()))); 1193 if (dex_cache.get() == NULL) { 1194 return NULL; 1195 } 1196 SirtRef<mirror::String> 1197 location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str())); 1198 if (location.get() == NULL) { 1199 return NULL; 1200 } 1201 SirtRef<mirror::ObjectArray<mirror::String> > 1202 strings(self, AllocStringArray(self, dex_file.NumStringIds())); 1203 if (strings.get() == NULL) { 1204 return NULL; 1205 } 1206 SirtRef<mirror::ObjectArray<mirror::Class> > 1207 types(self, AllocClassArray(self, dex_file.NumTypeIds())); 1208 if (types.get() == NULL) { 1209 return NULL; 1210 } 1211 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 1212 methods(self, AllocArtMethodArray(self, dex_file.NumMethodIds())); 1213 if (methods.get() == NULL) { 1214 return NULL; 1215 } 1216 SirtRef<mirror::ObjectArray<mirror::ArtField> > 1217 fields(self, AllocArtFieldArray(self, dex_file.NumFieldIds())); 1218 if (fields.get() == NULL) { 1219 return NULL; 1220 } 1221 SirtRef<mirror::ObjectArray<mirror::StaticStorageBase> > 1222 initialized_static_storage(self, 1223 AllocObjectArray<mirror::StaticStorageBase>(self, dex_file.NumTypeIds())); 1224 if (initialized_static_storage.get() == NULL) { 1225 return NULL; 1226 } 1227 1228 dex_cache->Init(&dex_file, 1229 location.get(), 1230 strings.get(), 1231 types.get(), 1232 methods.get(), 1233 fields.get(), 1234 initialized_static_storage.get()); 1235 return dex_cache.get(); 1236} 1237 1238mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1239 size_t class_size) { 1240 DCHECK_GE(class_size, sizeof(mirror::Class)); 1241 gc::Heap* heap = Runtime::Current()->GetHeap(); 1242 SirtRef<mirror::Class> klass(self, 1243 heap->AllocObject(self, java_lang_Class, class_size)->AsClass()); 1244 klass->SetPrimitiveType(Primitive::kPrimNot); // default to not being primitive 1245 klass->SetClassSize(class_size); 1246 return klass.get(); 1247} 1248 1249mirror::Class* ClassLinker::AllocClass(Thread* self, size_t class_size) { 1250 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1251} 1252 1253mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1254 return down_cast<mirror::ArtField*>(GetClassRoot(kJavaLangReflectArtField)->AllocObject(self)); 1255} 1256 1257mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1258 return down_cast<mirror::ArtMethod*>(GetClassRoot(kJavaLangReflectArtMethod)->AllocObject(self)); 1259} 1260 1261mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray(Thread* self, 1262 size_t length) { 1263 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc(self, 1264 GetClassRoot(kJavaLangStackTraceElementArrayClass), 1265 length); 1266} 1267 1268static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1269 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1270 DCHECK(klass != NULL); 1271 // Wait for the class if it has not already been linked. 1272 if (!klass->IsResolved() && !klass->IsErroneous()) { 1273 ObjectLock lock(self, klass); 1274 // Check for circular dependencies between classes. 1275 if (!klass->IsResolved() && klass->GetClinitThreadId() == self->GetTid()) { 1276 ThrowClassCircularityError(klass); 1277 klass->SetStatus(mirror::Class::kStatusError); 1278 return NULL; 1279 } 1280 // Wait for the pending initialization to complete. 1281 while (!klass->IsResolved() && !klass->IsErroneous()) { 1282 lock.WaitIgnoringInterrupts(); 1283 } 1284 } 1285 if (klass->IsErroneous()) { 1286 ThrowEarlierClassFailure(klass); 1287 return NULL; 1288 } 1289 // Return the loaded class. No exceptions should be pending. 1290 CHECK(klass->IsResolved()) << PrettyClass(klass); 1291 self->AssertNoPendingException(); 1292 return klass; 1293} 1294 1295bool ClassLinker::IsInBootClassPath(const char* descriptor) { 1296 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1297 return pair.second != NULL; 1298} 1299 1300mirror::Class* ClassLinker::FindSystemClass(const char* descriptor) { 1301 return FindClass(descriptor, NULL); 1302} 1303 1304mirror::Class* ClassLinker::FindClass(const char* descriptor, mirror::ClassLoader* class_loader) { 1305 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1306 Thread* self = Thread::Current(); 1307 DCHECK(self != NULL); 1308 self->AssertNoPendingException(); 1309 if (descriptor[1] == '\0') { 1310 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1311 // for primitive classes that aren't backed by dex files. 1312 return FindPrimitiveClass(descriptor[0]); 1313 } 1314 // Find the class in the loaded classes table. 1315 mirror::Class* klass = LookupClass(descriptor, class_loader); 1316 if (klass != NULL) { 1317 return EnsureResolved(self, klass); 1318 } 1319 // Class is not yet loaded. 1320 if (descriptor[0] == '[') { 1321 return CreateArrayClass(descriptor, class_loader); 1322 1323 } else if (class_loader == NULL) { 1324 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1325 if (pair.second != NULL) { 1326 return DefineClass(descriptor, NULL, *pair.first, *pair.second); 1327 } 1328 1329 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1330 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1331 // throw of a NoClassDefFoundError. 1332 if (IsInBootClassPath(descriptor)) { 1333 mirror::Class* system_class = FindSystemClass(descriptor); 1334 CHECK(system_class != NULL); 1335 return system_class; 1336 } 1337 // Next try the compile time class path. 1338 const std::vector<const DexFile*>* class_path; 1339 { 1340 ScopedObjectAccessUnchecked soa(self); 1341 ScopedLocalRef<jobject> jclass_loader(soa.Env(), soa.AddLocalReference<jobject>(class_loader)); 1342 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1343 } 1344 1345 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1346 if (pair.second != NULL) { 1347 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1348 } 1349 1350 } else { 1351 ScopedObjectAccessUnchecked soa(self->GetJniEnv()); 1352 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1353 soa.AddLocalReference<jobject>(class_loader)); 1354 std::string class_name_string(DescriptorToDot(descriptor)); 1355 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1356 { 1357 ScopedThreadStateChange tsc(self, kNative); 1358 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1359 soa.Env()->NewStringUTF(class_name_string.c_str())); 1360 if (class_name_object.get() == NULL) { 1361 return NULL; 1362 } 1363 CHECK(class_loader_object.get() != NULL); 1364 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1365 WellKnownClasses::java_lang_ClassLoader_loadClass, 1366 class_name_object.get())); 1367 } 1368 if (soa.Self()->IsExceptionPending()) { 1369 // If the ClassLoader threw, pass that exception up. 1370 return NULL; 1371 } else if (result.get() == NULL) { 1372 // broken loader - throw NPE to be compatible with Dalvik 1373 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1374 class_name_string.c_str()).c_str()); 1375 return NULL; 1376 } else { 1377 // success, return mirror::Class* 1378 return soa.Decode<mirror::Class*>(result.get()); 1379 } 1380 } 1381 1382 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1383 return NULL; 1384} 1385 1386mirror::Class* ClassLinker::DefineClass(const StringPiece& descriptor, 1387 mirror::ClassLoader* class_loader, 1388 const DexFile& dex_file, 1389 const DexFile::ClassDef& dex_class_def) { 1390 Thread* self = Thread::Current(); 1391 SirtRef<mirror::Class> klass(self, NULL); 1392 // Load the class from the dex file. 1393 if (!init_done_) { 1394 // finish up init of hand crafted class_roots_ 1395 if (descriptor == "Ljava/lang/Object;") { 1396 klass.reset(GetClassRoot(kJavaLangObject)); 1397 } else if (descriptor == "Ljava/lang/Class;") { 1398 klass.reset(GetClassRoot(kJavaLangClass)); 1399 } else if (descriptor == "Ljava/lang/String;") { 1400 klass.reset(GetClassRoot(kJavaLangString)); 1401 } else if (descriptor == "Ljava/lang/DexCache;") { 1402 klass.reset(GetClassRoot(kJavaLangDexCache)); 1403 } else if (descriptor == "Ljava/lang/reflect/ArtField;") { 1404 klass.reset(GetClassRoot(kJavaLangReflectArtField)); 1405 } else if (descriptor == "Ljava/lang/reflect/ArtMethod;") { 1406 klass.reset(GetClassRoot(kJavaLangReflectArtMethod)); 1407 } else { 1408 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1409 } 1410 } else { 1411 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1412 } 1413 klass->SetDexCache(FindDexCache(dex_file)); 1414 LoadClass(dex_file, dex_class_def, klass, class_loader); 1415 // Check for a pending exception during load 1416 if (self->IsExceptionPending()) { 1417 klass->SetStatus(mirror::Class::kStatusError); 1418 return NULL; 1419 } 1420 ObjectLock lock(self, klass.get()); 1421 klass->SetClinitThreadId(self->GetTid()); 1422 // Add the newly loaded class to the loaded classes table. 1423 SirtRef<mirror::Class> existing(self, InsertClass(descriptor, klass.get(), false)); 1424 if (existing.get() != NULL) { 1425 // We failed to insert because we raced with another thread. 1426 return EnsureResolved(self, existing.get()); 1427 } 1428 // Finish loading (if necessary) by finding parents 1429 CHECK(!klass->IsLoaded()); 1430 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1431 // Loading failed. 1432 klass->SetStatus(mirror::Class::kStatusError); 1433 lock.NotifyAll(); 1434 return NULL; 1435 } 1436 CHECK(klass->IsLoaded()); 1437 // Link the class (if necessary) 1438 CHECK(!klass->IsResolved()); 1439 if (!LinkClass(klass, NULL)) { 1440 // Linking failed. 1441 klass->SetStatus(mirror::Class::kStatusError); 1442 lock.NotifyAll(); 1443 return NULL; 1444 } 1445 CHECK(klass->IsResolved()); 1446 1447 /* 1448 * We send CLASS_PREPARE events to the debugger from here. The 1449 * definition of "preparation" is creating the static fields for a 1450 * class and initializing them to the standard default values, but not 1451 * executing any code (that comes later, during "initialization"). 1452 * 1453 * We did the static preparation in LinkClass. 1454 * 1455 * The class has been prepared and resolved but possibly not yet verified 1456 * at this point. 1457 */ 1458 Dbg::PostClassPrepare(klass.get()); 1459 1460 return klass.get(); 1461} 1462 1463// Precomputes size that will be needed for Class, matching LinkStaticFields 1464size_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1465 const DexFile::ClassDef& dex_class_def) { 1466 const byte* class_data = dex_file.GetClassData(dex_class_def); 1467 size_t num_ref = 0; 1468 size_t num_32 = 0; 1469 size_t num_64 = 0; 1470 if (class_data != NULL) { 1471 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1472 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1473 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1474 char c = descriptor[0]; 1475 if (c == 'L' || c == '[') { 1476 num_ref++; 1477 } else if (c == 'J' || c == 'D') { 1478 num_64++; 1479 } else { 1480 num_32++; 1481 } 1482 } 1483 } 1484 // start with generic class data 1485 size_t size = sizeof(mirror::Class); 1486 // follow with reference fields which must be contiguous at start 1487 size += (num_ref * sizeof(uint32_t)); 1488 // if there are 64-bit fields to add, make sure they are aligned 1489 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1490 if (num_32 != 0) { 1491 // use an available 32-bit field for padding 1492 num_32--; 1493 } 1494 size += sizeof(uint32_t); // either way, we are adding a word 1495 DCHECK_EQ(size, RoundUp(size, 8)); 1496 } 1497 // tack on any 64-bit fields now that alignment is assured 1498 size += (num_64 * sizeof(uint64_t)); 1499 // tack on any remaining 32-bit fields 1500 size += (num_32 * sizeof(uint32_t)); 1501 return size; 1502} 1503 1504const OatFile::OatClass* ClassLinker::GetOatClass(const DexFile& dex_file, const char* descriptor) { 1505 DCHECK(descriptor != NULL); 1506 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1507 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << descriptor; 1508 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation()); 1509 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << descriptor; 1510 uint32_t class_def_index; 1511 bool found = dex_file.FindClassDefIndex(descriptor, class_def_index); 1512 CHECK(found) << dex_file.GetLocation() << " " << descriptor; 1513 const OatFile::OatClass* oat_class = oat_dex_file->GetOatClass(class_def_index); 1514 CHECK(oat_class != NULL) << dex_file.GetLocation() << " " << descriptor; 1515 return oat_class; 1516} 1517 1518static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint32_t method_idx) { 1519 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 1520 const DexFile::TypeId& type_id = dex_file.GetTypeId(method_id.class_idx_); 1521 const DexFile::ClassDef* class_def = dex_file.FindClassDef(dex_file.GetTypeDescriptor(type_id)); 1522 CHECK(class_def != NULL); 1523 const byte* class_data = dex_file.GetClassData(*class_def); 1524 CHECK(class_data != NULL); 1525 ClassDataItemIterator it(dex_file, class_data); 1526 // Skip fields 1527 while (it.HasNextStaticField()) { 1528 it.Next(); 1529 } 1530 while (it.HasNextInstanceField()) { 1531 it.Next(); 1532 } 1533 // Process methods 1534 size_t class_def_method_index = 0; 1535 while (it.HasNextDirectMethod()) { 1536 if (it.GetMemberIndex() == method_idx) { 1537 return class_def_method_index; 1538 } 1539 class_def_method_index++; 1540 it.Next(); 1541 } 1542 while (it.HasNextVirtualMethod()) { 1543 if (it.GetMemberIndex() == method_idx) { 1544 return class_def_method_index; 1545 } 1546 class_def_method_index++; 1547 it.Next(); 1548 } 1549 DCHECK(!it.HasNext()); 1550 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1551 return 0; 1552} 1553 1554const OatFile::OatMethod ClassLinker::GetOatMethodFor(const mirror::ArtMethod* method) { 1555 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1556 // method for direct methods (or virtual methods made direct). 1557 mirror::Class* declaring_class = method->GetDeclaringClass(); 1558 size_t oat_method_index; 1559 if (method->IsStatic() || method->IsDirect()) { 1560 // Simple case where the oat method index was stashed at load time. 1561 oat_method_index = method->GetMethodIndex(); 1562 } else { 1563 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1564 // by search for its position in the declared virtual methods. 1565 oat_method_index = declaring_class->NumDirectMethods(); 1566 size_t end = declaring_class->NumVirtualMethods(); 1567 bool found = false; 1568 for (size_t i = 0; i < end; i++) { 1569 if (declaring_class->GetVirtualMethod(i) == method) { 1570 found = true; 1571 break; 1572 } 1573 oat_method_index++; 1574 } 1575 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1576 } 1577 ClassHelper kh(declaring_class); 1578 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(kh.GetDexFile(), kh.GetDescriptor())); 1579 CHECK(oat_class.get() != NULL); 1580 DCHECK_EQ(oat_method_index, 1581 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1582 method->GetDexMethodIndex())); 1583 1584 return oat_class->GetOatMethod(oat_method_index); 1585} 1586 1587// Special case to get oat code without overwriting a trampoline. 1588const void* ClassLinker::GetOatCodeFor(const mirror::ArtMethod* method) { 1589 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1590 if (method->IsProxyMethod()) { 1591#if !defined(ART_USE_PORTABLE_COMPILER) 1592 return reinterpret_cast<void*>(art_quick_proxy_invoke_handler); 1593#else 1594 return reinterpret_cast<void*>(art_portable_proxy_invoke_handler); 1595#endif 1596 } 1597 const void* result = GetOatMethodFor(method).GetCode(); 1598 if (result == NULL) { 1599 // No code? You must mean to go into the interpreter. 1600 result = GetCompiledCodeToInterpreterBridge(); 1601 } 1602 return result; 1603} 1604 1605const void* ClassLinker::GetOatCodeFor(const DexFile& dex_file, uint32_t method_idx) { 1606 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 1607 const char* descriptor = dex_file.GetTypeDescriptor(dex_file.GetTypeId(method_id.class_idx_)); 1608 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, method_idx); 1609 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, descriptor)); 1610 CHECK(oat_class.get() != NULL); 1611 return oat_class->GetOatMethod(oat_method_idx).GetCode(); 1612} 1613 1614// Returns true if the method must run with interpreter, false otherwise. 1615static bool NeedsInterpreter(const mirror::ArtMethod* method, const void* code) { 1616 if (code == NULL) { 1617 // No code: need interpreter. 1618 return true; 1619 } 1620#ifdef ART_SEA_IR_MODE 1621 ScopedObjectAccess soa(Thread::Current()); 1622 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1623 LOG(INFO) << "Found " << PrettyMethod(method); 1624 return false; 1625 } 1626#endif 1627 // If interpreter mode is enabled, every method (except native and proxy) must 1628 // be run with interpreter. 1629 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1630 !method->IsNative() && !method->IsProxyMethod(); 1631} 1632 1633void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1634 ClassHelper kh(klass); 1635 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 1636 CHECK(dex_class_def != NULL); 1637 const DexFile& dex_file = kh.GetDexFile(); 1638 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1639 if (class_data == NULL) { 1640 return; // no fields or methods - for example a marker interface 1641 } 1642 Runtime* runtime = Runtime::Current(); 1643 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1644 // OAT file unavailable 1645 return; 1646 } 1647 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, kh.GetDescriptor())); 1648 CHECK(oat_class.get() != NULL); 1649 ClassDataItemIterator it(dex_file, class_data); 1650 // Skip fields 1651 while (it.HasNextStaticField()) { 1652 it.Next(); 1653 } 1654 while (it.HasNextInstanceField()) { 1655 it.Next(); 1656 } 1657 // Link the code of methods skipped by LinkCode 1658 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1659 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1660 if (!method->IsStatic()) { 1661 // Only update static methods. 1662 continue; 1663 } 1664 const void* code = oat_class->GetOatMethod(method_index).GetCode(); 1665 const bool enter_interpreter = NeedsInterpreter(method, code); 1666 if (enter_interpreter) { 1667 // Use interpreter entry point. 1668 code = GetCompiledCodeToInterpreterBridge(); 1669 } 1670 runtime->GetInstrumentation()->UpdateMethodsCode(method, code); 1671 } 1672 // Ignore virtual methods on the iterator. 1673} 1674 1675static void LinkCode(SirtRef<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class, 1676 uint32_t method_index) 1677 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1678 // Method shouldn't have already been linked. 1679 DCHECK(method->GetEntryPointFromCompiledCode() == NULL); 1680 // Every kind of method should at least get an invoke stub from the oat_method. 1681 // non-abstract methods also get their code pointers. 1682 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1683 oat_method.LinkMethod(method.get()); 1684 1685 // Install entry point from interpreter. 1686 Runtime* runtime = Runtime::Current(); 1687 bool enter_interpreter = NeedsInterpreter(method.get(), method->GetEntryPointFromCompiledCode()); 1688 if (enter_interpreter) { 1689 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1690 } else { 1691 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1692 } 1693 1694 if (method->IsAbstract()) { 1695 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1696 return; 1697 } 1698 1699 if (method->IsStatic() && !method->IsConstructor()) { 1700 // For static methods excluding the class initializer, install the trampoline. 1701 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1702 // after initializing class (see ClassLinker::InitializeClass method). 1703 method->SetEntryPointFromCompiledCode(GetResolutionTrampoline(runtime->GetClassLinker())); 1704 } else if (enter_interpreter) { 1705 // Set entry point from compiled code if there's no code or in interpreter only mode. 1706 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1707 } 1708 1709 if (method->IsNative()) { 1710 // Unregistering restores the dlsym lookup stub. 1711 method->UnregisterNative(Thread::Current()); 1712 } 1713 1714 // Allow instrumentation its chance to hijack code. 1715 runtime->GetInstrumentation()->UpdateMethodsCode(method.get(), 1716 method->GetEntryPointFromCompiledCode()); 1717} 1718 1719void ClassLinker::LoadClass(const DexFile& dex_file, 1720 const DexFile::ClassDef& dex_class_def, 1721 SirtRef<mirror::Class>& klass, 1722 mirror::ClassLoader* class_loader) { 1723 CHECK(klass.get() != NULL); 1724 CHECK(klass->GetDexCache() != NULL); 1725 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1726 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1727 CHECK(descriptor != NULL); 1728 1729 klass->SetClass(GetClassRoot(kJavaLangClass)); 1730 uint32_t access_flags = dex_class_def.access_flags_; 1731 // Make sure that none of our runtime-only flags are set. 1732 // TODO: JACK CLASS ACCESS (HACK TO BE REMOVED) 1733 CHECK_EQ(access_flags & ~(kAccJavaFlagsMask | kAccClassJack), 0U); 1734 klass->SetAccessFlags(access_flags); 1735 klass->SetClassLoader(class_loader); 1736 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1737 klass->SetStatus(mirror::Class::kStatusIdx); 1738 1739 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1740 1741 // Load fields fields. 1742 const byte* class_data = dex_file.GetClassData(dex_class_def); 1743 if (class_data == NULL) { 1744 return; // no fields or methods - for example a marker interface 1745 } 1746 ClassDataItemIterator it(dex_file, class_data); 1747 Thread* self = Thread::Current(); 1748 if (it.NumStaticFields() != 0) { 1749 klass->SetSFields(AllocArtFieldArray(self, it.NumStaticFields())); 1750 } 1751 if (it.NumInstanceFields() != 0) { 1752 klass->SetIFields(AllocArtFieldArray(self, it.NumInstanceFields())); 1753 } 1754 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1755 SirtRef<mirror::ArtField> sfield(self, AllocArtField(self)); 1756 klass->SetStaticField(i, sfield.get()); 1757 LoadField(dex_file, it, klass, sfield); 1758 } 1759 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1760 SirtRef<mirror::ArtField> ifield(self, AllocArtField(self)); 1761 klass->SetInstanceField(i, ifield.get()); 1762 LoadField(dex_file, it, klass, ifield); 1763 } 1764 1765 UniquePtr<const OatFile::OatClass> oat_class; 1766 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1767 oat_class.reset(GetOatClass(dex_file, descriptor)); 1768 } 1769 1770 // Load methods. 1771 if (it.NumDirectMethods() != 0) { 1772 // TODO: append direct methods to class object 1773 klass->SetDirectMethods(AllocArtMethodArray(self, it.NumDirectMethods())); 1774 } 1775 if (it.NumVirtualMethods() != 0) { 1776 // TODO: append direct methods to class object 1777 klass->SetVirtualMethods(AllocArtMethodArray(self, it.NumVirtualMethods())); 1778 } 1779 size_t class_def_method_index = 0; 1780 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1781 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1782 klass->SetDirectMethod(i, method.get()); 1783 if (oat_class.get() != NULL) { 1784 LinkCode(method, oat_class.get(), class_def_method_index); 1785 } 1786 method->SetMethodIndex(class_def_method_index); 1787 class_def_method_index++; 1788 } 1789 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1790 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1791 klass->SetVirtualMethod(i, method.get()); 1792 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1793 if (oat_class.get() != NULL) { 1794 LinkCode(method, oat_class.get(), class_def_method_index); 1795 } 1796 class_def_method_index++; 1797 } 1798 DCHECK(!it.HasNext()); 1799} 1800 1801void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1802 SirtRef<mirror::Class>& klass, SirtRef<mirror::ArtField>& dst) { 1803 uint32_t field_idx = it.GetMemberIndex(); 1804 dst->SetDexFieldIndex(field_idx); 1805 dst->SetDeclaringClass(klass.get()); 1806 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1807} 1808 1809mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1810 const ClassDataItemIterator& it, 1811 SirtRef<mirror::Class>& klass) { 1812 uint32_t dex_method_idx = it.GetMemberIndex(); 1813 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1814 StringPiece method_name(dex_file.GetMethodName(method_id)); 1815 1816 mirror::ArtMethod* dst = AllocArtMethod(self); 1817 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 1818 1819 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 1820 dst->SetDexMethodIndex(dex_method_idx); 1821 dst->SetDeclaringClass(klass.get()); 1822 1823 if (method_name == "finalize") { 1824 // Create the prototype for a signature of "()V" 1825 const DexFile::StringId* void_string_id = dex_file.FindStringId("V"); 1826 if (void_string_id != NULL) { 1827 const DexFile::TypeId* void_type_id = 1828 dex_file.FindTypeId(dex_file.GetIndexForStringId(*void_string_id)); 1829 if (void_type_id != NULL) { 1830 std::vector<uint16_t> no_args; 1831 const DexFile::ProtoId* finalizer_proto = 1832 dex_file.FindProtoId(dex_file.GetIndexForTypeId(*void_type_id), no_args); 1833 if (finalizer_proto != NULL) { 1834 // We have the prototype in the dex file 1835 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 1836 klass->SetFinalizable(); 1837 } else { 1838 StringPiece klass_descriptor(dex_file.StringByTypeIdx(klass->GetDexTypeIndex())); 1839 // The Enum class declares a "final" finalize() method to prevent subclasses from 1840 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 1841 // subclasses, so we exclude it here. 1842 // We also want to avoid setting the flag on Object, where we know that finalize() is 1843 // empty. 1844 if (klass_descriptor != "Ljava/lang/Object;" && 1845 klass_descriptor != "Ljava/lang/Enum;") { 1846 klass->SetFinalizable(); 1847 } 1848 } 1849 } 1850 } 1851 } 1852 } 1853 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 1854 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1855 1856 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 1857 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 1858 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 1859 dst->SetDexCacheInitializedStaticStorage(klass->GetDexCache()->GetInitializedStaticStorage()); 1860 1861 CHECK(dst->IsArtMethod()); 1862 1863 self->EndAssertNoThreadSuspension(old_cause); 1864 return dst; 1865} 1866 1867void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 1868 Thread* self = Thread::Current(); 1869 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1870 AppendToBootClassPath(dex_file, dex_cache); 1871} 1872 1873void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1874 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1875 boot_class_path_.push_back(&dex_file); 1876 RegisterDexFile(dex_file, dex_cache); 1877} 1878 1879bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 1880 dex_lock_.AssertSharedHeld(Thread::Current()); 1881 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1882 if (dex_caches_[i]->GetDexFile() == &dex_file) { 1883 return true; 1884 } 1885 } 1886 return false; 1887} 1888 1889bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 1890 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1891 return IsDexFileRegisteredLocked(dex_file); 1892} 1893 1894void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1895 dex_lock_.AssertExclusiveHeld(Thread::Current()); 1896 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1897 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())); 1898 dex_caches_.push_back(dex_cache.get()); 1899 dex_cache->SetDexFile(&dex_file); 1900 Dirty(); 1901} 1902 1903void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 1904 Thread* self = Thread::Current(); 1905 { 1906 ReaderMutexLock mu(self, dex_lock_); 1907 if (IsDexFileRegisteredLocked(dex_file)) { 1908 return; 1909 } 1910 } 1911 // Don't alloc while holding the lock, since allocation may need to 1912 // suspend all threads and another thread may need the dex_lock_ to 1913 // get to a suspend point. 1914 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1915 { 1916 WriterMutexLock mu(self, dex_lock_); 1917 if (IsDexFileRegisteredLocked(dex_file)) { 1918 return; 1919 } 1920 RegisterDexFileLocked(dex_file, dex_cache); 1921 } 1922} 1923 1924void ClassLinker::RegisterDexFile(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1925 WriterMutexLock mu(Thread::Current(), dex_lock_); 1926 RegisterDexFileLocked(dex_file, dex_cache); 1927} 1928 1929mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 1930 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1931 // Search assuming unique-ness of dex file. 1932 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1933 mirror::DexCache* dex_cache = dex_caches_[i]; 1934 if (dex_cache->GetDexFile() == &dex_file) { 1935 return dex_cache; 1936 } 1937 } 1938 // Search matching by location name. 1939 std::string location(dex_file.GetLocation()); 1940 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1941 mirror::DexCache* dex_cache = dex_caches_[i]; 1942 if (dex_cache->GetDexFile()->GetLocation() == location) { 1943 return dex_cache; 1944 } 1945 } 1946 // Failure, dump diagnostic and abort. 1947 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1948 mirror::DexCache* dex_cache = dex_caches_[i]; 1949 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 1950 } 1951 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 1952 return NULL; 1953} 1954 1955void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 1956 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1957 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1958 dex_caches_[i]->Fixup(resolution_method); 1959 } 1960} 1961 1962mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 1963 return InitializePrimitiveClass(AllocClass(self, sizeof(mirror::Class)), type); 1964} 1965 1966mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, Primitive::Type type) { 1967 CHECK(primitive_class != NULL); 1968 // Must hold lock on object when initializing. 1969 ObjectLock lock(Thread::Current(), primitive_class); 1970 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 1971 primitive_class->SetPrimitiveType(type); 1972 primitive_class->SetStatus(mirror::Class::kStatusInitialized); 1973 mirror::Class* existing = InsertClass(Primitive::Descriptor(type), primitive_class, false); 1974 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 1975 return primitive_class; 1976} 1977 1978// Create an array class (i.e. the class object for the array, not the 1979// array itself). "descriptor" looks like "[C" or "[[[[B" or 1980// "[Ljava/lang/String;". 1981// 1982// If "descriptor" refers to an array of primitives, look up the 1983// primitive type's internally-generated class object. 1984// 1985// "class_loader" is the class loader of the class that's referring to 1986// us. It's used to ensure that we're looking for the element type in 1987// the right context. It does NOT become the class loader for the 1988// array class; that always comes from the base element class. 1989// 1990// Returns NULL with an exception raised on failure. 1991mirror::Class* ClassLinker::CreateArrayClass(const std::string& descriptor, 1992 mirror::ClassLoader* class_loader) { 1993 CHECK_EQ('[', descriptor[0]); 1994 1995 // Identify the underlying component type 1996 mirror::Class* component_type = FindClass(descriptor.substr(1).c_str(), class_loader); 1997 if (component_type == NULL) { 1998 DCHECK(Thread::Current()->IsExceptionPending()); 1999 return NULL; 2000 } 2001 2002 // See if the component type is already loaded. Array classes are 2003 // always associated with the class loader of their underlying 2004 // element type -- an array of Strings goes with the loader for 2005 // java/lang/String -- so we need to look for it there. (The 2006 // caller should have checked for the existence of the class 2007 // before calling here, but they did so with *their* class loader, 2008 // not the component type's loader.) 2009 // 2010 // If we find it, the caller adds "loader" to the class' initiating 2011 // loader list, which should prevent us from going through this again. 2012 // 2013 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2014 // are the same, because our caller (FindClass) just did the 2015 // lookup. (Even if we get this wrong we still have correct behavior, 2016 // because we effectively do this lookup again when we add the new 2017 // class to the hash table --- necessary because of possible races with 2018 // other threads.) 2019 if (class_loader != component_type->GetClassLoader()) { 2020 mirror::Class* new_class = LookupClass(descriptor.c_str(), component_type->GetClassLoader()); 2021 if (new_class != NULL) { 2022 return new_class; 2023 } 2024 } 2025 2026 // Fill out the fields in the Class. 2027 // 2028 // It is possible to execute some methods against arrays, because 2029 // all arrays are subclasses of java_lang_Object_, so we need to set 2030 // up a vtable. We can just point at the one in java_lang_Object_. 2031 // 2032 // Array classes are simple enough that we don't need to do a full 2033 // link step. 2034 Thread* self = Thread::Current(); 2035 SirtRef<mirror::Class> new_class(self, NULL); 2036 if (!init_done_) { 2037 // Classes that were hand created, ie not by FindSystemClass 2038 if (descriptor == "[Ljava/lang/Class;") { 2039 new_class.reset(GetClassRoot(kClassArrayClass)); 2040 } else if (descriptor == "[Ljava/lang/Object;") { 2041 new_class.reset(GetClassRoot(kObjectArrayClass)); 2042 } else if (descriptor == class_roots_descriptors_[kJavaLangStringArrayClass]) { 2043 new_class.reset(GetClassRoot(kJavaLangStringArrayClass)); 2044 } else if (descriptor == class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) { 2045 new_class.reset(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2046 } else if (descriptor == class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) { 2047 new_class.reset(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2048 } else if (descriptor == "[C") { 2049 new_class.reset(GetClassRoot(kCharArrayClass)); 2050 } else if (descriptor == "[I") { 2051 new_class.reset(GetClassRoot(kIntArrayClass)); 2052 } 2053 } 2054 if (new_class.get() == NULL) { 2055 new_class.reset(AllocClass(self, sizeof(mirror::Class))); 2056 if (new_class.get() == NULL) { 2057 return NULL; 2058 } 2059 new_class->SetComponentType(component_type); 2060 } 2061 ObjectLock lock(self, new_class.get()); // Must hold lock on object when initializing. 2062 DCHECK(new_class->GetComponentType() != NULL); 2063 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2064 new_class->SetSuperClass(java_lang_Object); 2065 new_class->SetVTable(java_lang_Object->GetVTable()); 2066 new_class->SetPrimitiveType(Primitive::kPrimNot); 2067 new_class->SetClassLoader(component_type->GetClassLoader()); 2068 new_class->SetStatus(mirror::Class::kStatusInitialized); 2069 // don't need to set new_class->SetObjectSize(..) 2070 // because Object::SizeOf delegates to Array::SizeOf 2071 2072 2073 // All arrays have java/lang/Cloneable and java/io/Serializable as 2074 // interfaces. We need to set that up here, so that stuff like 2075 // "instanceof" works right. 2076 // 2077 // Note: The GC could run during the call to FindSystemClass, 2078 // so we need to make sure the class object is GC-valid while we're in 2079 // there. Do this by clearing the interface list so the GC will just 2080 // think that the entries are null. 2081 2082 2083 // Use the single, global copies of "interfaces" and "iftable" 2084 // (remember not to free them for arrays). 2085 CHECK(array_iftable_ != NULL); 2086 new_class->SetIfTable(array_iftable_); 2087 2088 // Inherit access flags from the component type. 2089 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2090 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2091 access_flags &= kAccJavaFlagsMask; 2092 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2093 // and remove "interface". 2094 access_flags |= kAccAbstract | kAccFinal; 2095 access_flags &= ~kAccInterface; 2096 2097 new_class->SetAccessFlags(access_flags); 2098 2099 mirror::Class* existing = InsertClass(descriptor, new_class.get(), false); 2100 if (existing == NULL) { 2101 return new_class.get(); 2102 } 2103 // Another thread must have loaded the class after we 2104 // started but before we finished. Abandon what we've 2105 // done. 2106 // 2107 // (Yes, this happens.) 2108 2109 return existing; 2110} 2111 2112mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2113 switch (Primitive::GetType(type)) { 2114 case Primitive::kPrimByte: 2115 return GetClassRoot(kPrimitiveByte); 2116 case Primitive::kPrimChar: 2117 return GetClassRoot(kPrimitiveChar); 2118 case Primitive::kPrimDouble: 2119 return GetClassRoot(kPrimitiveDouble); 2120 case Primitive::kPrimFloat: 2121 return GetClassRoot(kPrimitiveFloat); 2122 case Primitive::kPrimInt: 2123 return GetClassRoot(kPrimitiveInt); 2124 case Primitive::kPrimLong: 2125 return GetClassRoot(kPrimitiveLong); 2126 case Primitive::kPrimShort: 2127 return GetClassRoot(kPrimitiveShort); 2128 case Primitive::kPrimBoolean: 2129 return GetClassRoot(kPrimitiveBoolean); 2130 case Primitive::kPrimVoid: 2131 return GetClassRoot(kPrimitiveVoid); 2132 case Primitive::kPrimNot: 2133 break; 2134 } 2135 std::string printable_type(PrintableChar(type)); 2136 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2137 return NULL; 2138} 2139 2140mirror::Class* ClassLinker::InsertClass(const StringPiece& descriptor, mirror::Class* klass, 2141 bool image_class) { 2142 if (VLOG_IS_ON(class_linker)) { 2143 mirror::DexCache* dex_cache = klass->GetDexCache(); 2144 std::string source; 2145 if (dex_cache != NULL) { 2146 source += " from "; 2147 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2148 } 2149 LOG(INFO) << "Loaded class " << descriptor << source; 2150 } 2151 size_t hash = StringPieceHash()(descriptor); 2152 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2153 Table& classes = image_class ? image_classes_ : classes_; 2154 mirror::Class* existing = 2155 LookupClassLocked(descriptor.data(), klass->GetClassLoader(), hash, classes); 2156#ifndef NDEBUG 2157 // Check we don't have the class in the other table in error 2158 Table& other_classes = image_class ? classes_ : image_classes_; 2159 CHECK(LookupClassLocked(descriptor.data(), klass->GetClassLoader(), hash, other_classes) == NULL); 2160#endif 2161 if (existing != NULL) { 2162 return existing; 2163 } 2164 Runtime::Current()->GetHeap()->VerifyObject(klass); 2165 classes.insert(std::make_pair(hash, klass)); 2166 Dirty(); 2167 return NULL; 2168} 2169 2170bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2171 size_t hash = Hash(descriptor); 2172 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2173 // TODO: determine if its better to search classes_ or image_classes_ first 2174 ClassHelper kh; 2175 for (auto it = classes_.lower_bound(hash), end = classes_.end(); it != end && it->first == hash; 2176 ++it) { 2177 mirror::Class* klass = it->second; 2178 kh.ChangeClass(klass); 2179 if (strcmp(kh.GetDescriptor(), descriptor) == 0 && klass->GetClassLoader() == class_loader) { 2180 classes_.erase(it); 2181 return true; 2182 } 2183 } 2184 for (auto it = image_classes_.lower_bound(hash), end = classes_.end(); 2185 it != end && it->first == hash; ++it) { 2186 mirror::Class* klass = it->second; 2187 kh.ChangeClass(klass); 2188 if (strcmp(kh.GetDescriptor(), descriptor) == 0 && klass->GetClassLoader() == class_loader) { 2189 image_classes_.erase(it); 2190 return true; 2191 } 2192 } 2193 return false; 2194} 2195 2196mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2197 const mirror::ClassLoader* class_loader) { 2198 size_t hash = Hash(descriptor); 2199 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2200 // TODO: determine if its better to search classes_ or image_classes_ first 2201 mirror::Class* klass = NULL; 2202 // Use image class only if the class_loader is null. 2203 if (class_loader == NULL) { 2204 klass = LookupClassLocked(descriptor, class_loader, hash, image_classes_); 2205 } 2206 if (klass != NULL) { 2207 return klass; 2208 } 2209 return LookupClassLocked(descriptor, class_loader, hash, classes_); 2210} 2211 2212mirror::Class* ClassLinker::LookupClassLocked(const char* descriptor, 2213 const mirror::ClassLoader* class_loader, 2214 size_t hash, const Table& classes) { 2215 ClassHelper kh(NULL, this); 2216 auto end = classes_.end(); 2217 for (auto it = classes.lower_bound(hash); it != end && it->first == hash; 2218 ++it) { 2219 mirror::Class* klass = it->second; 2220 kh.ChangeClass(klass); 2221 if (strcmp(descriptor, kh.GetDescriptor()) == 0 && klass->GetClassLoader() == class_loader) { 2222#ifndef NDEBUG 2223 for (++it; it != end && it->first == hash; ++it) { 2224 mirror::Class* klass2 = it->second; 2225 kh.ChangeClass(klass2); 2226 CHECK(!(strcmp(descriptor, kh.GetDescriptor()) == 0 && klass2->GetClassLoader() == class_loader)) 2227 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2228 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2229 } 2230#endif 2231 return klass; 2232 } 2233 } 2234 return NULL; 2235} 2236 2237void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& classes) { 2238 classes.clear(); 2239 size_t hash = Hash(descriptor); 2240 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2241 // TODO: determine if its better to search classes_ or image_classes_ first 2242 ClassHelper kh(NULL, this); 2243 for (auto it = classes_.lower_bound(hash), end = classes_.end(); it != end && it->first == hash; 2244 ++it) { 2245 mirror::Class* klass = it->second; 2246 kh.ChangeClass(klass); 2247 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2248 classes.push_back(klass); 2249 } 2250 } 2251 for (auto it = image_classes_.lower_bound(hash), end = classes_.end(); 2252 it != end && it->first == hash; ++it) { 2253 mirror::Class* klass = it->second; 2254 kh.ChangeClass(klass); 2255 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2256 classes.push_back(klass); 2257 } 2258 } 2259} 2260 2261void ClassLinker::VerifyClass(mirror::Class* klass) { 2262 // TODO: assert that the monitor on the Class is held 2263 Thread* self = Thread::Current(); 2264 ObjectLock lock(self, klass); 2265 2266 // Don't attempt to re-verify if already sufficiently verified. 2267 if (klass->IsVerified() || 2268 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2269 return; 2270 } 2271 2272 // The class might already be erroneous, for example at compile time if we attempted to verify 2273 // this class as a parent to another. 2274 if (klass->IsErroneous()) { 2275 ThrowEarlierClassFailure(klass); 2276 return; 2277 } 2278 2279 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2280 klass->SetStatus(mirror::Class::kStatusVerifying); 2281 } else { 2282 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2283 << PrettyClass(klass); 2284 CHECK(!Runtime::Current()->IsCompiler()); 2285 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime); 2286 } 2287 2288 // Verify super class. 2289 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 2290 if (super.get() != NULL) { 2291 // Acquire lock to prevent races on verifying the super class. 2292 ObjectLock lock(self, super.get()); 2293 2294 if (!super->IsVerified() && !super->IsErroneous()) { 2295 VerifyClass(super.get()); 2296 } 2297 if (!super->IsCompileTimeVerified()) { 2298 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2299 PrettyDescriptor(klass).c_str(), 2300 PrettyDescriptor(super.get()).c_str())); 2301 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2302 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 2303 if (cause.get() != NULL) { 2304 self->ClearException(); 2305 } 2306 ThrowVerifyError(klass, "%s", error_msg.c_str()); 2307 if (cause.get() != NULL) { 2308 self->GetException(NULL)->SetCause(cause.get()); 2309 } 2310 klass->SetStatus(mirror::Class::kStatusError); 2311 return; 2312 } 2313 } 2314 2315 // Try to use verification information from the oat file, otherwise do runtime verification. 2316 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2317 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2318 bool preverified = VerifyClassUsingOatFile(dex_file, klass, oat_file_class_status); 2319 if (oat_file_class_status == mirror::Class::kStatusError) { 2320 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2321 << PrettyDescriptor(klass) << " in " 2322 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2323 ThrowVerifyError(klass, "Rejecting class %s because it failed compile-time verification", 2324 PrettyDescriptor(klass).c_str()); 2325 klass->SetStatus(mirror::Class::kStatusError); 2326 return; 2327 } 2328 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2329 std::string error_msg; 2330 if (!preverified) { 2331 verifier_failure = verifier::MethodVerifier::VerifyClass(klass, error_msg, 2332 Runtime::Current()->IsCompiler()); 2333 } 2334 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2335 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2336 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass) 2337 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2338 << " because: " << error_msg; 2339 } 2340 self->AssertNoPendingException(); 2341 // Make sure all classes referenced by catch blocks are resolved. 2342 ResolveClassExceptionHandlerTypes(dex_file, klass); 2343 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2344 // Even though there were no verifier failures we need to respect whether the super-class 2345 // was verified or requiring runtime reverification. 2346 if (super.get() == NULL || super->IsVerified()) { 2347 klass->SetStatus(mirror::Class::kStatusVerified); 2348 } else { 2349 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2350 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime); 2351 // Pretend a soft failure occured so that we don't consider the class verified below. 2352 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2353 } 2354 } else { 2355 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2356 // Soft failures at compile time should be retried at runtime. Soft 2357 // failures at runtime will be handled by slow paths in the generated 2358 // code. Set status accordingly. 2359 if (Runtime::Current()->IsCompiler()) { 2360 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime); 2361 } else { 2362 klass->SetStatus(mirror::Class::kStatusVerified); 2363 } 2364 } 2365 } else { 2366 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass) 2367 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2368 << " because: " << error_msg; 2369 self->AssertNoPendingException(); 2370 ThrowVerifyError(klass, "%s", error_msg.c_str()); 2371 klass->SetStatus(mirror::Class::kStatusError); 2372 } 2373 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2374 // Class is verified so we don't need to do any access check on its methods. 2375 // Let the interpreter know it by setting the kAccPreverified flag onto each 2376 // method. 2377 // Note: we're going here during compilation and at runtime. When we set the 2378 // kAccPreverified flag when compiling image classes, the flag is recorded 2379 // in the image and is set when loading the image. 2380 klass->SetPreverifiedFlagOnAllMethods(); 2381 } 2382} 2383 2384bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2385 mirror::Class::Status& oat_file_class_status) { 2386 // If we're compiling, we can only verify the class using the oat file if 2387 // we are not compiling the image or if the class we're verifying is not part of 2388 // the app. In other words, we will only check for preverification of bootclasspath 2389 // classes. 2390 if (Runtime::Current()->IsCompiler()) { 2391 // Are we compiling the bootclasspath? 2392 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2393 return false; 2394 } 2395 // We are compiling an app (not the image). 2396 2397 // Is this an app class? (I.e. not a bootclasspath class) 2398 if (klass->GetClassLoader() != NULL) { 2399 return false; 2400 } 2401 } 2402 2403 2404 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2405 // Make this work with gtests, which do not set up the image properly. 2406 // TODO: we should clean up gtests to set up the image path properly. 2407 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2408 return false; 2409 } 2410 2411 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2412 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation()); 2413 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2414 const char* descriptor = ClassHelper(klass).GetDescriptor(); 2415 uint32_t class_def_index; 2416 bool found = dex_file.FindClassDefIndex(descriptor, class_def_index); 2417 CHECK(found) << dex_file.GetLocation() << " " << PrettyClass(klass) << " " << descriptor; 2418 UniquePtr<const OatFile::OatClass> oat_class(oat_dex_file->GetOatClass(class_def_index)); 2419 CHECK(oat_class.get() != NULL) 2420 << dex_file.GetLocation() << " " << PrettyClass(klass) << " " << descriptor; 2421 oat_file_class_status = oat_class->GetStatus(); 2422 if (oat_file_class_status == mirror::Class::kStatusVerified || 2423 oat_file_class_status == mirror::Class::kStatusInitialized) { 2424 return true; 2425 } 2426 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2427 // Compile time verification failed with a soft error. Compile time verification can fail 2428 // because we have incomplete type information. Consider the following: 2429 // class ... { 2430 // Foo x; 2431 // .... () { 2432 // if (...) { 2433 // v1 gets assigned a type of resolved class Foo 2434 // } else { 2435 // v1 gets assigned a type of unresolved class Bar 2436 // } 2437 // iput x = v1 2438 // } } 2439 // when we merge v1 following the if-the-else it results in Conflict 2440 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2441 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2442 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2443 // at compile time). 2444 return false; 2445 } 2446 if (oat_file_class_status == mirror::Class::kStatusError) { 2447 // Compile time verification failed with a hard error. This is caused by invalid instructions 2448 // in the class. These errors are unrecoverable. 2449 return false; 2450 } 2451 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2452 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2453 // not loading the class. 2454 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2455 // isn't a problem and this case shouldn't occur 2456 return false; 2457 } 2458 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2459 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " << descriptor; 2460 2461 return false; 2462} 2463 2464void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, mirror::Class* klass) { 2465 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2466 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2467 } 2468 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2469 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2470 } 2471} 2472 2473void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2474 mirror::ArtMethod* method) { 2475 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2476 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2477 if (code_item == NULL) { 2478 return; // native or abstract method 2479 } 2480 if (code_item->tries_size_ == 0) { 2481 return; // nothing to process 2482 } 2483 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2484 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2485 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2486 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2487 CatchHandlerIterator iterator(handlers_ptr); 2488 for (; iterator.HasNext(); iterator.Next()) { 2489 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2490 // unresolved exception types will be ignored by exception delivery 2491 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2492 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2493 if (exception_type == NULL) { 2494 DCHECK(Thread::Current()->IsExceptionPending()); 2495 Thread::Current()->ClearException(); 2496 } 2497 } 2498 } 2499 handlers_ptr = iterator.EndDataPointer(); 2500 } 2501} 2502 2503static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2504static void CheckProxyMethod(mirror::ArtMethod* method, 2505 SirtRef<mirror::ArtMethod>& prototype); 2506 2507mirror::Class* ClassLinker::CreateProxyClass(mirror::String* name, 2508 mirror::ObjectArray<mirror::Class>* interfaces, 2509 mirror::ClassLoader* loader, 2510 mirror::ObjectArray<mirror::ArtMethod>* methods, 2511 mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >* throws) { 2512 Thread* self = Thread::Current(); 2513 SirtRef<mirror::Class> klass(self, AllocClass(self, GetClassRoot(kJavaLangClass), 2514 sizeof(mirror::SynthesizedProxyClass))); 2515 CHECK(klass.get() != NULL); 2516 DCHECK(klass->GetClass() != NULL); 2517 klass->SetObjectSize(sizeof(mirror::Proxy)); 2518 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2519 klass->SetClassLoader(loader); 2520 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2521 klass->SetName(name); 2522 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2523 klass->SetDexCache(proxy_class->GetDexCache()); 2524 2525 klass->SetStatus(mirror::Class::kStatusIdx); 2526 2527 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); 2528 2529 // Instance fields are inherited, but we add a couple of static fields... 2530 klass->SetSFields(AllocArtFieldArray(self, 2)); 2531 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2532 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2533 SirtRef<mirror::ArtField> interfaces_sfield(self, AllocArtField(self)); 2534 klass->SetStaticField(0, interfaces_sfield.get()); 2535 interfaces_sfield->SetDexFieldIndex(0); 2536 interfaces_sfield->SetDeclaringClass(klass.get()); 2537 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2538 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2539 SirtRef<mirror::ArtField> throws_sfield(self, AllocArtField(self)); 2540 klass->SetStaticField(1, throws_sfield.get()); 2541 throws_sfield->SetDexFieldIndex(1); 2542 throws_sfield->SetDeclaringClass(klass.get()); 2543 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2544 2545 // Proxies have 1 direct method, the constructor 2546 klass->SetDirectMethods(AllocArtMethodArray(self, 1)); 2547 klass->SetDirectMethod(0, CreateProxyConstructor(self, klass, proxy_class)); 2548 2549 // Create virtual method using specified prototypes 2550 size_t num_virtual_methods = methods->GetLength(); 2551 klass->SetVirtualMethods(AllocArtMethodArray(self, num_virtual_methods)); 2552 for (size_t i = 0; i < num_virtual_methods; ++i) { 2553 SirtRef<mirror::ArtMethod> prototype(self, methods->Get(i)); 2554 klass->SetVirtualMethod(i, CreateProxyMethod(self, klass, prototype)); 2555 } 2556 2557 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2558 klass->SetStatus(mirror::Class::kStatusLoaded); // Class is now effectively in the loaded state 2559 self->AssertNoPendingException(); 2560 2561 // Link the fields and virtual methods, creating vtable and iftables 2562 if (!LinkClass(klass, interfaces)) { 2563 klass->SetStatus(mirror::Class::kStatusError); 2564 return NULL; 2565 } 2566 { 2567 ObjectLock lock(self, klass.get()); // Must hold lock on object when initializing. 2568 interfaces_sfield->SetObject(klass.get(), interfaces); 2569 throws_sfield->SetObject(klass.get(), throws); 2570 klass->SetStatus(mirror::Class::kStatusInitialized); 2571 } 2572 2573 // sanity checks 2574 if (kIsDebugBuild) { 2575 CHECK(klass->GetIFields() == NULL); 2576 CheckProxyConstructor(klass->GetDirectMethod(0)); 2577 for (size_t i = 0; i < num_virtual_methods; ++i) { 2578 SirtRef<mirror::ArtMethod> prototype(self, methods->Get(i)); 2579 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2580 } 2581 2582 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2583 name->ToModifiedUtf8().c_str())); 2584 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2585 2586 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2587 name->ToModifiedUtf8().c_str())); 2588 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2589 2590 mirror::SynthesizedProxyClass* synth_proxy_class = 2591 down_cast<mirror::SynthesizedProxyClass*>(klass.get()); 2592 CHECK_EQ(synth_proxy_class->GetInterfaces(), interfaces); 2593 CHECK_EQ(synth_proxy_class->GetThrows(), throws); 2594 } 2595 return klass.get(); 2596} 2597 2598std::string ClassLinker::GetDescriptorForProxy(const mirror::Class* proxy_class) { 2599 DCHECK(proxy_class->IsProxyClass()); 2600 mirror::String* name = proxy_class->GetName(); 2601 DCHECK(name != NULL); 2602 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2603} 2604 2605mirror::ArtMethod* ClassLinker::FindMethodForProxy(const mirror::Class* proxy_class, 2606 const mirror::ArtMethod* proxy_method) { 2607 DCHECK(proxy_class->IsProxyClass()); 2608 DCHECK(proxy_method->IsProxyMethod()); 2609 // Locate the dex cache of the original interface/Object 2610 mirror::DexCache* dex_cache = NULL; 2611 { 2612 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2613 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2614 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2615 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2616 dex_cache = dex_caches_[i]; 2617 break; 2618 } 2619 } 2620 } 2621 CHECK(dex_cache != NULL); 2622 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2623 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2624 CHECK(resolved_method != NULL); 2625 return resolved_method; 2626} 2627 2628 2629mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2630 SirtRef<mirror::Class>& klass, 2631 mirror::Class* proxy_class) { 2632 // Create constructor for Proxy that must initialize h 2633 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2634 proxy_class->GetDirectMethods(); 2635 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2636 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2637 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2638 // code_ too) 2639 mirror::ArtMethod* constructor = 2640 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2641 // Make this constructor public and fix the class to be our Proxy version 2642 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2643 constructor->SetDeclaringClass(klass.get()); 2644 return constructor; 2645} 2646 2647static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2648 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2649 CHECK(constructor->IsConstructor()); 2650 MethodHelper mh(constructor); 2651 CHECK_STREQ(mh.GetName(), "<init>"); 2652 CHECK_EQ(mh.GetSignature(), std::string("(Ljava/lang/reflect/InvocationHandler;)V")); 2653 DCHECK(constructor->IsPublic()); 2654} 2655 2656mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, SirtRef<mirror::Class>& klass, 2657 SirtRef<mirror::ArtMethod>& prototype) { 2658 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2659 // prototype method 2660 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2661 prototype.get()); 2662 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2663 // as necessary 2664 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 2665 2666 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 2667 // the intersection of throw exceptions as defined in Proxy 2668 method->SetDeclaringClass(klass.get()); 2669 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 2670 2671 // At runtime the method looks like a reference and argument saving method, clone the code 2672 // related parameters from this method. 2673 mirror::ArtMethod* refs_and_args = 2674 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 2675 method->SetCoreSpillMask(refs_and_args->GetCoreSpillMask()); 2676 method->SetFpSpillMask(refs_and_args->GetFpSpillMask()); 2677 method->SetFrameSizeInBytes(refs_and_args->GetFrameSizeInBytes()); 2678 method->SetEntryPointFromCompiledCode(GetProxyInvokeHandler()); 2679 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2680 2681 return method; 2682} 2683 2684static void CheckProxyMethod(mirror::ArtMethod* method, 2685 SirtRef<mirror::ArtMethod>& prototype) 2686 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2687 // Basic sanity 2688 CHECK(!prototype->IsFinal()); 2689 CHECK(method->IsFinal()); 2690 CHECK(!method->IsAbstract()); 2691 2692 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 2693 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 2694 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 2695 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 2696 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 2697 CHECK_EQ(prototype->GetDexCacheInitializedStaticStorage(), 2698 method->GetDexCacheInitializedStaticStorage()); 2699 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 2700 2701 MethodHelper mh(method); 2702 MethodHelper mh2(prototype.get()); 2703 CHECK_STREQ(mh.GetName(), mh2.GetName()); 2704 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 2705 // More complex sanity - via dex cache 2706 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 2707} 2708 2709static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 2710 bool can_init_parents) 2711 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2712 if (can_init_statics && can_init_statics) { 2713 return true; 2714 } 2715 if (!can_init_statics) { 2716 // Check if there's a class initializer. 2717 mirror::ArtMethod* clinit = klass->FindDeclaredDirectMethod("<clinit>", "()V"); 2718 if (clinit != NULL) { 2719 return false; 2720 } 2721 // Check if there are encoded static values needing initialization. 2722 if (klass->NumStaticFields() != 0) { 2723 ClassHelper kh(klass); 2724 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 2725 DCHECK(dex_class_def != NULL); 2726 if (dex_class_def->static_values_off_ != 0) { 2727 return false; 2728 } 2729 } 2730 } 2731 if (!klass->IsInterface() && klass->HasSuperClass()) { 2732 mirror::Class* super_class = klass->GetSuperClass(); 2733 if (!can_init_parents && !super_class->IsInitialized()) { 2734 return false; 2735 } else { 2736 if (!CanWeInitializeClass(super_class, can_init_statics, true)) { 2737 return false; 2738 } 2739 } 2740 } 2741 return true; 2742} 2743 2744bool ClassLinker::InitializeClass(mirror::Class* klass, bool can_init_statics, 2745 bool can_init_parents) { 2746 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 2747 2748 // Are we already initialized and therefore done? 2749 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 2750 // an initialized class will never change its state. 2751 if (klass->IsInitialized()) { 2752 return true; 2753 } 2754 2755 // Fast fail if initialization requires a full runtime. Not part of the JLS. 2756 if (!CanWeInitializeClass(klass, can_init_statics, can_init_parents)) { 2757 return false; 2758 } 2759 2760 Thread* self = Thread::Current(); 2761 uint64_t t0; 2762 { 2763 ObjectLock lock(self, klass); 2764 2765 // Re-check under the lock in case another thread initialized ahead of us. 2766 if (klass->IsInitialized()) { 2767 return true; 2768 } 2769 2770 // Was the class already found to be erroneous? Done under the lock to match the JLS. 2771 if (klass->IsErroneous()) { 2772 ThrowEarlierClassFailure(klass); 2773 return false; 2774 } 2775 2776 CHECK(klass->IsResolved()) << PrettyClass(klass) << ": state=" << klass->GetStatus(); 2777 2778 if (!klass->IsVerified()) { 2779 VerifyClass(klass); 2780 if (!klass->IsVerified()) { 2781 // We failed to verify, expect either the klass to be erroneous or verification failed at 2782 // compile time. 2783 if (klass->IsErroneous()) { 2784 CHECK(self->IsExceptionPending()); 2785 } else { 2786 CHECK(Runtime::Current()->IsCompiler()); 2787 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2788 } 2789 return false; 2790 } 2791 } 2792 2793 // If the class is kStatusInitializing, either this thread is 2794 // initializing higher up the stack or another thread has beat us 2795 // to initializing and we need to wait. Either way, this 2796 // invocation of InitializeClass will not be responsible for 2797 // running <clinit> and will return. 2798 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 2799 // We caught somebody else in the act; was it us? 2800 if (klass->GetClinitThreadId() == self->GetTid()) { 2801 // Yes. That's fine. Return so we can continue initializing. 2802 return true; 2803 } 2804 // No. That's fine. Wait for another thread to finish initializing. 2805 return WaitForInitializeClass(klass, self, lock); 2806 } 2807 2808 if (!ValidateSuperClassDescriptors(klass)) { 2809 klass->SetStatus(mirror::Class::kStatusError); 2810 return false; 2811 } 2812 2813 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass); 2814 2815 // From here out other threads may observe that we're initializing and so changes of state 2816 // require the a notification. 2817 klass->SetClinitThreadId(self->GetTid()); 2818 klass->SetStatus(mirror::Class::kStatusInitializing); 2819 2820 t0 = NanoTime(); 2821 } 2822 2823 // Initialize super classes, must be done while initializing for the JLS. 2824 if (!klass->IsInterface() && klass->HasSuperClass()) { 2825 mirror::Class* super_class = klass->GetSuperClass(); 2826 if (!super_class->IsInitialized()) { 2827 CHECK(!super_class->IsInterface()); 2828 CHECK(can_init_parents); 2829 bool super_initialized = InitializeClass(super_class, can_init_statics, true); 2830 if (!super_initialized) { 2831 // The super class was verified ahead of entering initializing, we should only be here if 2832 // the super class became erroneous due to initialization. 2833 CHECK(super_class->IsErroneous() && self->IsExceptionPending()) 2834 << "Super class initialization failed for " << PrettyDescriptor(super_class) 2835 << " that has unexpected status " << super_class->GetStatus() 2836 << "\nPending exception:\n" 2837 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 2838 ObjectLock lock(self, klass); 2839 // Initialization failed because the super-class is erroneous. 2840 klass->SetStatus(mirror::Class::kStatusError); 2841 lock.NotifyAll(); 2842 return false; 2843 } 2844 } 2845 } 2846 2847 if (klass->NumStaticFields() > 0) { 2848 ClassHelper kh(klass); 2849 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 2850 CHECK(dex_class_def != NULL); 2851 const DexFile& dex_file = kh.GetDexFile(); 2852 EncodedStaticFieldValueIterator it(dex_file, kh.GetDexCache(), klass->GetClassLoader(), 2853 this, *dex_class_def); 2854 if (it.HasNext()) { 2855 CHECK(can_init_statics); 2856 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 2857 SafeMap<uint32_t, mirror::ArtField*> field_map; 2858 ConstructFieldMap(dex_file, *dex_class_def, klass, field_map); 2859 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 2860 it.ReadValueToField(field_map.Get(i)); 2861 } 2862 } 2863 } 2864 2865 mirror::ArtMethod* clinit = klass->FindDeclaredDirectMethod("<clinit>", "()V"); 2866 if (clinit != NULL) { 2867 CHECK(can_init_statics); 2868 if (LIKELY(Runtime::Current()->IsStarted())) { 2869 JValue result; 2870 clinit->Invoke(self, NULL, 0, &result, 'V'); 2871 } else { 2872 art::interpreter::EnterInterpreterFromInvoke(self, clinit, NULL, NULL, NULL); 2873 } 2874 } 2875 2876 // Opportunistically set static method trampolines to their destination. 2877 FixupStaticTrampolines(klass); 2878 2879 uint64_t t1 = NanoTime(); 2880 2881 bool success = true; 2882 { 2883 ObjectLock lock(self, klass); 2884 2885 if (self->IsExceptionPending()) { 2886 WrapExceptionInInitializer(); 2887 klass->SetStatus(mirror::Class::kStatusError); 2888 success = false; 2889 } else { 2890 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 2891 RuntimeStats* thread_stats = self->GetStats(); 2892 ++global_stats->class_init_count; 2893 ++thread_stats->class_init_count; 2894 global_stats->class_init_time_ns += (t1 - t0); 2895 thread_stats->class_init_time_ns += (t1 - t0); 2896 // Set the class as initialized except if failed to initialize static fields. 2897 klass->SetStatus(mirror::Class::kStatusInitialized); 2898 if (VLOG_IS_ON(class_linker)) { 2899 ClassHelper kh(klass); 2900 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 2901 } 2902 } 2903 lock.NotifyAll(); 2904 } 2905 return success; 2906} 2907 2908bool ClassLinker::WaitForInitializeClass(mirror::Class* klass, Thread* self, ObjectLock& lock) 2909 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2910 while (true) { 2911 self->AssertNoPendingException(); 2912 CHECK(!klass->IsInitialized()); 2913 lock.WaitIgnoringInterrupts(); 2914 2915 // When we wake up, repeat the test for init-in-progress. If 2916 // there's an exception pending (only possible if 2917 // "interruptShouldThrow" was set), bail out. 2918 if (self->IsExceptionPending()) { 2919 WrapExceptionInInitializer(); 2920 klass->SetStatus(mirror::Class::kStatusError); 2921 return false; 2922 } 2923 // Spurious wakeup? Go back to waiting. 2924 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 2925 continue; 2926 } 2927 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 2928 // Compile time initialization failed. 2929 return false; 2930 } 2931 if (klass->IsErroneous()) { 2932 // The caller wants an exception, but it was thrown in a 2933 // different thread. Synthesize one here. 2934 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 2935 PrettyDescriptor(klass).c_str()); 2936 return false; 2937 } 2938 if (klass->IsInitialized()) { 2939 return true; 2940 } 2941 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass) << " is " << klass->GetStatus(); 2942 } 2943 LOG(FATAL) << "Not Reached" << PrettyClass(klass); 2944} 2945 2946bool ClassLinker::ValidateSuperClassDescriptors(const mirror::Class* klass) { 2947 if (klass->IsInterface()) { 2948 return true; 2949 } 2950 // begin with the methods local to the superclass 2951 if (klass->HasSuperClass() && 2952 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 2953 const mirror::Class* super = klass->GetSuperClass(); 2954 for (int i = super->GetVTable()->GetLength() - 1; i >= 0; --i) { 2955 const mirror::ArtMethod* method = klass->GetVTable()->Get(i); 2956 if (method != super->GetVTable()->Get(i) && 2957 !IsSameMethodSignatureInDifferentClassContexts(method, super, klass)) { 2958 ThrowLinkageError(klass, "Class %s method %s resolves differently in superclass %s", 2959 PrettyDescriptor(klass).c_str(), PrettyMethod(method).c_str(), 2960 PrettyDescriptor(super).c_str()); 2961 return false; 2962 } 2963 } 2964 } 2965 mirror::IfTable* iftable = klass->GetIfTable(); 2966 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 2967 mirror::Class* interface = iftable->GetInterface(i); 2968 if (klass->GetClassLoader() != interface->GetClassLoader()) { 2969 for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { 2970 const mirror::ArtMethod* method = iftable->GetMethodArray(i)->Get(j); 2971 if (!IsSameMethodSignatureInDifferentClassContexts(method, interface, 2972 method->GetDeclaringClass())) { 2973 ThrowLinkageError(klass, "Class %s method %s resolves differently in interface %s", 2974 PrettyDescriptor(method->GetDeclaringClass()).c_str(), 2975 PrettyMethod(method).c_str(), 2976 PrettyDescriptor(interface).c_str()); 2977 return false; 2978 } 2979 } 2980 } 2981 } 2982 return true; 2983} 2984 2985// Returns true if classes referenced by the signature of the method are the 2986// same classes in klass1 as they are in klass2. 2987bool ClassLinker::IsSameMethodSignatureInDifferentClassContexts(const mirror::ArtMethod* method, 2988 const mirror::Class* klass1, 2989 const mirror::Class* klass2) { 2990 if (klass1 == klass2) { 2991 return true; 2992 } 2993 const DexFile& dex_file = *method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 2994 const DexFile::ProtoId& proto_id = 2995 dex_file.GetMethodPrototype(dex_file.GetMethodId(method->GetDexMethodIndex())); 2996 for (DexFileParameterIterator it(dex_file, proto_id); it.HasNext(); it.Next()) { 2997 const char* descriptor = it.GetDescriptor(); 2998 if (descriptor == NULL) { 2999 break; 3000 } 3001 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3002 // Found a non-primitive type. 3003 if (!IsSameDescriptorInDifferentClassContexts(descriptor, klass1, klass2)) { 3004 return false; 3005 } 3006 } 3007 } 3008 // Check the return type 3009 const char* descriptor = dex_file.GetReturnTypeDescriptor(proto_id); 3010 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3011 if (!IsSameDescriptorInDifferentClassContexts(descriptor, klass1, klass2)) { 3012 return false; 3013 } 3014 } 3015 return true; 3016} 3017 3018// Returns true if the descriptor resolves to the same class in the context of klass1 and klass2. 3019bool ClassLinker::IsSameDescriptorInDifferentClassContexts(const char* descriptor, 3020 const mirror::Class* klass1, 3021 const mirror::Class* klass2) { 3022 CHECK(descriptor != NULL); 3023 CHECK(klass1 != NULL); 3024 CHECK(klass2 != NULL); 3025 if (klass1 == klass2) { 3026 return true; 3027 } 3028 mirror::Class* found1 = FindClass(descriptor, klass1->GetClassLoader()); 3029 if (found1 == NULL) { 3030 Thread::Current()->ClearException(); 3031 } 3032 mirror::Class* found2 = FindClass(descriptor, klass2->GetClassLoader()); 3033 if (found2 == NULL) { 3034 Thread::Current()->ClearException(); 3035 } 3036 return found1 == found2; 3037} 3038 3039bool ClassLinker::EnsureInitialized(mirror::Class* c, bool can_init_fields, bool can_init_parents) { 3040 DCHECK(c != NULL); 3041 if (c->IsInitialized()) { 3042 return true; 3043 } 3044 3045 bool success = InitializeClass(c, can_init_fields, can_init_parents); 3046 if (!success) { 3047 Thread* self = Thread::Current(); 3048 CHECK(self->IsExceptionPending() || !can_init_fields || !can_init_parents) << PrettyClass(c); 3049 } 3050 return success; 3051} 3052 3053void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3054 mirror::Class* c, SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3055 mirror::ClassLoader* cl = c->GetClassLoader(); 3056 const byte* class_data = dex_file.GetClassData(dex_class_def); 3057 ClassDataItemIterator it(dex_file, class_data); 3058 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3059 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), c->GetDexCache(), cl, true)); 3060 } 3061} 3062 3063bool ClassLinker::LinkClass(SirtRef<mirror::Class>& klass, 3064 mirror::ObjectArray<mirror::Class>* interfaces) { 3065 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3066 if (!LinkSuperClass(klass)) { 3067 return false; 3068 } 3069 if (!LinkMethods(klass, interfaces)) { 3070 return false; 3071 } 3072 if (!LinkInstanceFields(klass)) { 3073 return false; 3074 } 3075 if (!LinkStaticFields(klass)) { 3076 return false; 3077 } 3078 CreateReferenceInstanceOffsets(klass); 3079 CreateReferenceStaticOffsets(klass); 3080 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3081 klass->SetStatus(mirror::Class::kStatusResolved); 3082 return true; 3083} 3084 3085bool ClassLinker::LoadSuperAndInterfaces(SirtRef<mirror::Class>& klass, const DexFile& dex_file) { 3086 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3087 StringPiece descriptor(dex_file.StringByTypeIdx(klass->GetDexTypeIndex())); 3088 const DexFile::ClassDef* class_def = dex_file.FindClassDef(descriptor); 3089 CHECK(class_def != NULL); 3090 uint16_t super_class_idx = class_def->superclass_idx_; 3091 if (super_class_idx != DexFile::kDexNoIndex16) { 3092 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.get()); 3093 if (super_class == NULL) { 3094 DCHECK(Thread::Current()->IsExceptionPending()); 3095 return false; 3096 } 3097 // Verify 3098 if (!klass->CanAccess(super_class)) { 3099 ThrowIllegalAccessError(klass.get(), "Class %s extended by class %s is inaccessible", 3100 PrettyDescriptor(super_class).c_str(), 3101 PrettyDescriptor(klass.get()).c_str()); 3102 return false; 3103 } 3104 klass->SetSuperClass(super_class); 3105 } 3106 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(*class_def); 3107 if (interfaces != NULL) { 3108 for (size_t i = 0; i < interfaces->Size(); i++) { 3109 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3110 mirror::Class* interface = ResolveType(dex_file, idx, klass.get()); 3111 if (interface == NULL) { 3112 DCHECK(Thread::Current()->IsExceptionPending()); 3113 return false; 3114 } 3115 // Verify 3116 if (!klass->CanAccess(interface)) { 3117 // TODO: the RI seemed to ignore this in my testing. 3118 ThrowIllegalAccessError(klass.get(), "Interface %s implemented by class %s is inaccessible", 3119 PrettyDescriptor(interface).c_str(), 3120 PrettyDescriptor(klass.get()).c_str()); 3121 return false; 3122 } 3123 } 3124 } 3125 // Mark the class as loaded. 3126 klass->SetStatus(mirror::Class::kStatusLoaded); 3127 return true; 3128} 3129 3130bool ClassLinker::LinkSuperClass(SirtRef<mirror::Class>& klass) { 3131 CHECK(!klass->IsPrimitive()); 3132 mirror::Class* super = klass->GetSuperClass(); 3133 if (klass.get() == GetClassRoot(kJavaLangObject)) { 3134 if (super != NULL) { 3135 ThrowClassFormatError(klass.get(), "java.lang.Object must not have a superclass"); 3136 return false; 3137 } 3138 return true; 3139 } 3140 if (super == NULL) { 3141 ThrowLinkageError(klass.get(), "No superclass defined for class %s", 3142 PrettyDescriptor(klass.get()).c_str()); 3143 return false; 3144 } 3145 // Verify 3146 if (super->IsFinal() || super->IsInterface()) { 3147 ThrowIncompatibleClassChangeError(klass.get(), "Superclass %s of %s is %s", 3148 PrettyDescriptor(super).c_str(), 3149 PrettyDescriptor(klass.get()).c_str(), 3150 super->IsFinal() ? "declared final" : "an interface"); 3151 return false; 3152 } 3153 if (!klass->CanAccess(super)) { 3154 ThrowIllegalAccessError(klass.get(), "Superclass %s is inaccessible to class %s", 3155 PrettyDescriptor(super).c_str(), 3156 PrettyDescriptor(klass.get()).c_str()); 3157 return false; 3158 } 3159 3160 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3161 if (super->IsFinalizable()) { 3162 klass->SetFinalizable(); 3163 } 3164 3165 // Inherit reference flags (if any) from the superclass. 3166 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3167 if (reference_flags != 0) { 3168 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3169 } 3170 // Disallow custom direct subclasses of java.lang.ref.Reference. 3171 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3172 ThrowLinkageError(klass.get(), 3173 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3174 PrettyDescriptor(klass.get()).c_str()); 3175 return false; 3176 } 3177 3178#ifndef NDEBUG 3179 // Ensure super classes are fully resolved prior to resolving fields.. 3180 while (super != NULL) { 3181 CHECK(super->IsResolved()); 3182 super = super->GetSuperClass(); 3183 } 3184#endif 3185 return true; 3186} 3187 3188// Populate the class vtable and itable. Compute return type indices. 3189bool ClassLinker::LinkMethods(SirtRef<mirror::Class>& klass, 3190 mirror::ObjectArray<mirror::Class>* interfaces) { 3191 if (klass->IsInterface()) { 3192 // No vtable. 3193 size_t count = klass->NumVirtualMethods(); 3194 if (!IsUint(16, count)) { 3195 ThrowClassFormatError(klass.get(), "Too many methods on interface: %zd", count); 3196 return false; 3197 } 3198 for (size_t i = 0; i < count; ++i) { 3199 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3200 } 3201 // Link interface method tables 3202 return LinkInterfaceMethods(klass, interfaces); 3203 } else { 3204 // Link virtual and interface method tables 3205 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3206 } 3207 return true; 3208} 3209 3210bool ClassLinker::LinkVirtualMethods(SirtRef<mirror::Class>& klass) { 3211 Thread* self = Thread::Current(); 3212 if (klass->HasSuperClass()) { 3213 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3214 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3215 CHECK_LE(actual_count, max_count); 3216 // TODO: do not assign to the vtable field until it is fully constructed. 3217 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3218 vtable(self, klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count)); 3219 // See if any of our virtual methods override the superclass. 3220 MethodHelper local_mh(NULL, this); 3221 MethodHelper super_mh(NULL, this); 3222 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3223 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3224 local_mh.ChangeMethod(local_method); 3225 size_t j = 0; 3226 for (; j < actual_count; ++j) { 3227 mirror::ArtMethod* super_method = vtable->Get(j); 3228 super_mh.ChangeMethod(super_method); 3229 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3230 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3231 if (super_method->IsFinal()) { 3232 ThrowLinkageError(klass.get(), "Method %s overrides final method in class %s", 3233 PrettyMethod(local_method).c_str(), 3234 super_mh.GetDeclaringClassDescriptor()); 3235 return false; 3236 } 3237 vtable->Set(j, local_method); 3238 local_method->SetMethodIndex(j); 3239 break; 3240 } else { 3241 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3242 << " would have incorrectly overridden the package-private method in " 3243 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3244 } 3245 } 3246 } 3247 if (j == actual_count) { 3248 // Not overriding, append. 3249 vtable->Set(actual_count, local_method); 3250 local_method->SetMethodIndex(actual_count); 3251 actual_count += 1; 3252 } 3253 } 3254 if (!IsUint(16, actual_count)) { 3255 ThrowClassFormatError(klass.get(), "Too many methods defined on class: %zd", actual_count); 3256 return false; 3257 } 3258 // Shrink vtable if possible 3259 CHECK_LE(actual_count, max_count); 3260 if (actual_count < max_count) { 3261 vtable.reset(vtable->CopyOf(self, actual_count)); 3262 } 3263 klass->SetVTable(vtable.get()); 3264 } else { 3265 CHECK(klass.get() == GetClassRoot(kJavaLangObject)); 3266 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3267 if (!IsUint(16, num_virtual_methods)) { 3268 ThrowClassFormatError(klass.get(), "Too many methods: %d", num_virtual_methods); 3269 return false; 3270 } 3271 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3272 vtable(self, AllocArtMethodArray(self, num_virtual_methods)); 3273 for (size_t i = 0; i < num_virtual_methods; ++i) { 3274 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3275 vtable->Set(i, virtual_method); 3276 virtual_method->SetMethodIndex(i & 0xFFFF); 3277 } 3278 klass->SetVTable(vtable.get()); 3279 } 3280 return true; 3281} 3282 3283bool ClassLinker::LinkInterfaceMethods(SirtRef<mirror::Class>& klass, 3284 mirror::ObjectArray<mirror::Class>* interfaces) { 3285 size_t super_ifcount; 3286 if (klass->HasSuperClass()) { 3287 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3288 } else { 3289 super_ifcount = 0; 3290 } 3291 size_t ifcount = super_ifcount; 3292 ClassHelper kh(klass.get(), this); 3293 uint32_t num_interfaces = interfaces == NULL ? kh.NumDirectInterfaces() : interfaces->GetLength(); 3294 ifcount += num_interfaces; 3295 for (size_t i = 0; i < num_interfaces; i++) { 3296 mirror::Class* interface = interfaces == NULL ? kh.GetDirectInterface(i) : interfaces->Get(i); 3297 ifcount += interface->GetIfTableCount(); 3298 } 3299 if (ifcount == 0) { 3300 // Class implements no interfaces. 3301 DCHECK_EQ(klass->GetIfTableCount(), 0); 3302 DCHECK(klass->GetIfTable() == NULL); 3303 return true; 3304 } 3305 if (ifcount == super_ifcount) { 3306 // Class implements same interfaces as parent, are any of these not marker interfaces? 3307 bool has_non_marker_interface = false; 3308 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3309 for (size_t i = 0; i < ifcount; ++i) { 3310 if (super_iftable->GetMethodArrayCount(i) > 0) { 3311 has_non_marker_interface = true; 3312 break; 3313 } 3314 } 3315 if (!has_non_marker_interface) { 3316 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3317 klass->SetIfTable(super_iftable); 3318 return true; 3319 } 3320 } 3321 Thread* self = Thread::Current(); 3322 SirtRef<mirror::IfTable> iftable(self, AllocIfTable(self, ifcount)); 3323 if (super_ifcount != 0) { 3324 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3325 for (size_t i = 0; i < super_ifcount; i++) { 3326 mirror::Class* super_interface = super_iftable->GetInterface(i); 3327 iftable->SetInterface(i, super_interface); 3328 } 3329 } 3330 // Flatten the interface inheritance hierarchy. 3331 size_t idx = super_ifcount; 3332 for (size_t i = 0; i < num_interfaces; i++) { 3333 mirror::Class* interface = interfaces == NULL ? kh.GetDirectInterface(i) : interfaces->Get(i); 3334 DCHECK(interface != NULL); 3335 if (!interface->IsInterface()) { 3336 ClassHelper ih(interface); 3337 ThrowIncompatibleClassChangeError(klass.get(), "Class %s implements non-interface class %s", 3338 PrettyDescriptor(klass.get()).c_str(), 3339 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3340 return false; 3341 } 3342 // Check if interface is already in iftable 3343 bool duplicate = false; 3344 for (size_t j = 0; j < idx; j++) { 3345 mirror::Class* existing_interface = iftable->GetInterface(j); 3346 if (existing_interface == interface) { 3347 duplicate = true; 3348 break; 3349 } 3350 } 3351 if (!duplicate) { 3352 // Add this non-duplicate interface. 3353 iftable->SetInterface(idx++, interface); 3354 // Add this interface's non-duplicate super-interfaces. 3355 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3356 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3357 bool super_duplicate = false; 3358 for (size_t k = 0; k < idx; k++) { 3359 mirror::Class* existing_interface = iftable->GetInterface(k); 3360 if (existing_interface == super_interface) { 3361 super_duplicate = true; 3362 break; 3363 } 3364 } 3365 if (!super_duplicate) { 3366 iftable->SetInterface(idx++, super_interface); 3367 } 3368 } 3369 } 3370 } 3371 // Shrink iftable in case duplicates were found 3372 if (idx < ifcount) { 3373 iftable.reset(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3374 ifcount = idx; 3375 } else { 3376 CHECK_EQ(idx, ifcount); 3377 } 3378 klass->SetIfTable(iftable.get()); 3379 3380 // If we're an interface, we don't need the vtable pointers, so we're done. 3381 if (klass->IsInterface()) { 3382 return true; 3383 } 3384 std::vector<mirror::ArtMethod*> miranda_list; 3385 MethodHelper vtable_mh(NULL, this); 3386 MethodHelper interface_mh(NULL, this); 3387 for (size_t i = 0; i < ifcount; ++i) { 3388 mirror::Class* interface = iftable->GetInterface(i); 3389 size_t num_methods = interface->NumVirtualMethods(); 3390 if (num_methods > 0) { 3391 mirror::ObjectArray<mirror::ArtMethod>* method_array = 3392 AllocArtMethodArray(self, num_methods); 3393 iftable->SetMethodArray(i, method_array); 3394 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3395 for (size_t j = 0; j < num_methods; ++j) { 3396 mirror::ArtMethod* interface_method = interface->GetVirtualMethod(j); 3397 interface_mh.ChangeMethod(interface_method); 3398 int32_t k; 3399 // For each method listed in the interface's method list, find the 3400 // matching method in our class's method list. We want to favor the 3401 // subclass over the superclass, which just requires walking 3402 // back from the end of the vtable. (This only matters if the 3403 // superclass defines a private method and this class redefines 3404 // it -- otherwise it would use the same vtable slot. In .dex files 3405 // those don't end up in the virtual method table, so it shouldn't 3406 // matter which direction we go. We walk it backward anyway.) 3407 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3408 mirror::ArtMethod* vtable_method = vtable->Get(k); 3409 vtable_mh.ChangeMethod(vtable_method); 3410 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3411 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3412 ThrowIllegalAccessError(klass.get(), 3413 "Method '%s' implementing interface method '%s' is not public", 3414 PrettyMethod(vtable_method).c_str(), 3415 PrettyMethod(interface_method).c_str()); 3416 return false; 3417 } 3418 method_array->Set(j, vtable_method); 3419 break; 3420 } 3421 } 3422 if (k < 0) { 3423 SirtRef<mirror::ArtMethod> miranda_method(self, NULL); 3424 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3425 mirror::ArtMethod* mir_method = miranda_list[mir]; 3426 vtable_mh.ChangeMethod(mir_method); 3427 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3428 miranda_method.reset(miranda_list[mir]); 3429 break; 3430 } 3431 } 3432 if (miranda_method.get() == NULL) { 3433 // point the interface table at a phantom slot 3434 miranda_method.reset(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3435 miranda_list.push_back(miranda_method.get()); 3436 } 3437 method_array->Set(j, miranda_method.get()); 3438 } 3439 } 3440 } 3441 } 3442 if (!miranda_list.empty()) { 3443 int old_method_count = klass->NumVirtualMethods(); 3444 int new_method_count = old_method_count + miranda_list.size(); 3445 klass->SetVirtualMethods((old_method_count == 0) 3446 ? AllocArtMethodArray(self, new_method_count) 3447 : klass->GetVirtualMethods()->CopyOf(self, new_method_count)); 3448 3449 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3450 vtable(self, klass->GetVTableDuringLinking()); 3451 CHECK(vtable.get() != NULL); 3452 int old_vtable_count = vtable->GetLength(); 3453 int new_vtable_count = old_vtable_count + miranda_list.size(); 3454 vtable.reset(vtable->CopyOf(self, new_vtable_count)); 3455 for (size_t i = 0; i < miranda_list.size(); ++i) { 3456 mirror::ArtMethod* method = miranda_list[i]; 3457 // Leave the declaring class alone as type indices are relative to it 3458 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3459 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3460 klass->SetVirtualMethod(old_method_count + i, method); 3461 vtable->Set(old_vtable_count + i, method); 3462 } 3463 // TODO: do not assign to the vtable field until it is fully constructed. 3464 klass->SetVTable(vtable.get()); 3465 } 3466 3467 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3468 for (int i = 0; i < vtable->GetLength(); ++i) { 3469 CHECK(vtable->Get(i) != NULL); 3470 } 3471 3472// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3473 3474 return true; 3475} 3476 3477bool ClassLinker::LinkInstanceFields(SirtRef<mirror::Class>& klass) { 3478 CHECK(klass.get() != NULL); 3479 return LinkFields(klass, false); 3480} 3481 3482bool ClassLinker::LinkStaticFields(SirtRef<mirror::Class>& klass) { 3483 CHECK(klass.get() != NULL); 3484 size_t allocated_class_size = klass->GetClassSize(); 3485 bool success = LinkFields(klass, true); 3486 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3487 return success; 3488} 3489 3490struct LinkFieldsComparator { 3491 explicit LinkFieldsComparator(FieldHelper* fh) 3492 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 3493 : fh_(fh) {} 3494 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3495 bool operator()(const mirror::ArtField* field1, const mirror::ArtField* field2) 3496 NO_THREAD_SAFETY_ANALYSIS { 3497 // First come reference fields, then 64-bit, and finally 32-bit 3498 fh_->ChangeField(field1); 3499 Primitive::Type type1 = fh_->GetTypeAsPrimitiveType(); 3500 fh_->ChangeField(field2); 3501 Primitive::Type type2 = fh_->GetTypeAsPrimitiveType(); 3502 bool isPrimitive1 = type1 != Primitive::kPrimNot; 3503 bool isPrimitive2 = type2 != Primitive::kPrimNot; 3504 bool is64bit1 = isPrimitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3505 bool is64bit2 = isPrimitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3506 int order1 = (!isPrimitive1 ? 0 : (is64bit1 ? 1 : 2)); 3507 int order2 = (!isPrimitive2 ? 0 : (is64bit2 ? 1 : 2)); 3508 if (order1 != order2) { 3509 return order1 < order2; 3510 } 3511 3512 // same basic group? then sort by string. 3513 fh_->ChangeField(field1); 3514 StringPiece name1(fh_->GetName()); 3515 fh_->ChangeField(field2); 3516 StringPiece name2(fh_->GetName()); 3517 return name1 < name2; 3518 } 3519 3520 FieldHelper* fh_; 3521}; 3522 3523bool ClassLinker::LinkFields(SirtRef<mirror::Class>& klass, bool is_static) { 3524 size_t num_fields = 3525 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3526 3527 mirror::ObjectArray<mirror::ArtField>* fields = 3528 is_static ? klass->GetSFields() : klass->GetIFields(); 3529 3530 // Initialize size and field_offset 3531 size_t size; 3532 MemberOffset field_offset(0); 3533 if (is_static) { 3534 size = klass->GetClassSize(); 3535 field_offset = mirror::Class::FieldsOffset(); 3536 } else { 3537 mirror::Class* super_class = klass->GetSuperClass(); 3538 if (super_class != NULL) { 3539 CHECK(super_class->IsResolved()); 3540 field_offset = MemberOffset(super_class->GetObjectSize()); 3541 } 3542 size = field_offset.Uint32Value(); 3543 } 3544 3545 CHECK_EQ(num_fields == 0, fields == NULL); 3546 3547 // we want a relatively stable order so that adding new fields 3548 // minimizes disruption of C++ version such as Class and Method. 3549 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3550 for (size_t i = 0; i < num_fields; i++) { 3551 grouped_and_sorted_fields.push_back(fields->Get(i)); 3552 } 3553 FieldHelper fh(NULL, this); 3554 std::sort(grouped_and_sorted_fields.begin(), 3555 grouped_and_sorted_fields.end(), 3556 LinkFieldsComparator(&fh)); 3557 3558 // References should be at the front. 3559 size_t current_field = 0; 3560 size_t num_reference_fields = 0; 3561 for (; current_field < num_fields; current_field++) { 3562 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3563 fh.ChangeField(field); 3564 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3565 bool isPrimitive = type != Primitive::kPrimNot; 3566 if (isPrimitive) { 3567 break; // past last reference, move on to the next phase 3568 } 3569 grouped_and_sorted_fields.pop_front(); 3570 num_reference_fields++; 3571 fields->Set(current_field, field); 3572 field->SetOffset(field_offset); 3573 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3574 } 3575 3576 // Now we want to pack all of the double-wide fields together. If 3577 // we're not aligned, though, we want to shuffle one 32-bit field 3578 // into place. If we can't find one, we'll have to pad it. 3579 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3580 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3581 mirror::ArtField* field = grouped_and_sorted_fields[i]; 3582 fh.ChangeField(field); 3583 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3584 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3585 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 3586 continue; 3587 } 3588 fields->Set(current_field++, field); 3589 field->SetOffset(field_offset); 3590 // drop the consumed field 3591 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 3592 break; 3593 } 3594 // whether we found a 32-bit field for padding or not, we advance 3595 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3596 } 3597 3598 // Alignment is good, shuffle any double-wide fields forward, and 3599 // finish assigning field offsets to all fields. 3600 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 3601 while (!grouped_and_sorted_fields.empty()) { 3602 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3603 grouped_and_sorted_fields.pop_front(); 3604 fh.ChangeField(field); 3605 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3606 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3607 fields->Set(current_field, field); 3608 field->SetOffset(field_offset); 3609 field_offset = MemberOffset(field_offset.Uint32Value() + 3610 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 3611 ? sizeof(uint64_t) 3612 : sizeof(uint32_t))); 3613 current_field++; 3614 } 3615 3616 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 3617 if (!is_static && 3618 StringPiece(ClassHelper(klass.get(), this).GetDescriptor()) == "Ljava/lang/ref/Reference;") { 3619 // We know there are no non-reference fields in the Reference classes, and we know 3620 // that 'referent' is alphabetically last, so this is easy... 3621 CHECK_EQ(num_reference_fields, num_fields); 3622 fh.ChangeField(fields->Get(num_fields - 1)); 3623 CHECK_STREQ(fh.GetName(), "referent"); 3624 --num_reference_fields; 3625 } 3626 3627#ifndef NDEBUG 3628 // Make sure that all reference fields appear before 3629 // non-reference fields, and all double-wide fields are aligned. 3630 bool seen_non_ref = false; 3631 for (size_t i = 0; i < num_fields; i++) { 3632 mirror::ArtField* field = fields->Get(i); 3633 if (false) { // enable to debug field layout 3634 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 3635 << " class=" << PrettyClass(klass.get()) 3636 << " field=" << PrettyField(field) 3637 << " offset=" << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset()), 3638 false); 3639 } 3640 fh.ChangeField(field); 3641 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3642 bool is_primitive = type != Primitive::kPrimNot; 3643 if (StringPiece(ClassHelper(klass.get(), this).GetDescriptor()) == "Ljava/lang/ref/Reference;" && 3644 StringPiece(fh.GetName()) == "referent") { 3645 is_primitive = true; // We lied above, so we have to expect a lie here. 3646 } 3647 if (is_primitive) { 3648 if (!seen_non_ref) { 3649 seen_non_ref = true; 3650 DCHECK_EQ(num_reference_fields, i); 3651 } 3652 } else { 3653 DCHECK(!seen_non_ref); 3654 } 3655 } 3656 if (!seen_non_ref) { 3657 DCHECK_EQ(num_fields, num_reference_fields); 3658 } 3659#endif 3660 size = field_offset.Uint32Value(); 3661 // Update klass 3662 if (is_static) { 3663 klass->SetNumReferenceStaticFields(num_reference_fields); 3664 klass->SetClassSize(size); 3665 } else { 3666 klass->SetNumReferenceInstanceFields(num_reference_fields); 3667 if (!klass->IsVariableSize()) { 3668 DCHECK_GE(size, sizeof(mirror::Object)) << ClassHelper(klass.get(), this).GetDescriptor(); 3669 klass->SetObjectSize(size); 3670 } 3671 } 3672 return true; 3673} 3674 3675// Set the bitmap of reference offsets, refOffsets, from the ifields 3676// list. 3677void ClassLinker::CreateReferenceInstanceOffsets(SirtRef<mirror::Class>& klass) { 3678 uint32_t reference_offsets = 0; 3679 mirror::Class* super_class = klass->GetSuperClass(); 3680 if (super_class != NULL) { 3681 reference_offsets = super_class->GetReferenceInstanceOffsets(); 3682 // If our superclass overflowed, we don't stand a chance. 3683 if (reference_offsets == CLASS_WALK_SUPER) { 3684 klass->SetReferenceInstanceOffsets(reference_offsets); 3685 return; 3686 } 3687 } 3688 CreateReferenceOffsets(klass, false, reference_offsets); 3689} 3690 3691void ClassLinker::CreateReferenceStaticOffsets(SirtRef<mirror::Class>& klass) { 3692 CreateReferenceOffsets(klass, true, 0); 3693} 3694 3695void ClassLinker::CreateReferenceOffsets(SirtRef<mirror::Class>& klass, bool is_static, 3696 uint32_t reference_offsets) { 3697 size_t num_reference_fields = 3698 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 3699 : klass->NumReferenceInstanceFieldsDuringLinking(); 3700 const mirror::ObjectArray<mirror::ArtField>* fields = 3701 is_static ? klass->GetSFields() : klass->GetIFields(); 3702 // All of the fields that contain object references are guaranteed 3703 // to be at the beginning of the fields list. 3704 for (size_t i = 0; i < num_reference_fields; ++i) { 3705 // Note that byte_offset is the offset from the beginning of 3706 // object, not the offset into instance data 3707 const mirror::ArtField* field = fields->Get(i); 3708 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 3709 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 3710 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 3711 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 3712 CHECK_NE(new_bit, 0U); 3713 reference_offsets |= new_bit; 3714 } else { 3715 reference_offsets = CLASS_WALK_SUPER; 3716 break; 3717 } 3718 } 3719 // Update fields in klass 3720 if (is_static) { 3721 klass->SetReferenceStaticOffsets(reference_offsets); 3722 } else { 3723 klass->SetReferenceInstanceOffsets(reference_offsets); 3724 } 3725} 3726 3727mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, 3728 uint32_t string_idx, mirror::DexCache* dex_cache) { 3729 DCHECK(dex_cache != NULL); 3730 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 3731 if (resolved != NULL) { 3732 return resolved; 3733 } 3734 const DexFile::StringId& string_id = dex_file.GetStringId(string_idx); 3735 int32_t utf16_length = dex_file.GetStringLength(string_id); 3736 const char* utf8_data = dex_file.GetStringData(string_id); 3737 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 3738 dex_cache->SetResolvedString(string_idx, string); 3739 return string; 3740} 3741 3742mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, 3743 uint16_t type_idx, 3744 mirror::DexCache* dex_cache, 3745 mirror::ClassLoader* class_loader) { 3746 DCHECK(dex_cache != NULL); 3747 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 3748 if (resolved == NULL) { 3749 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 3750 resolved = FindClass(descriptor, class_loader); 3751 if (resolved != NULL) { 3752 // TODO: we used to throw here if resolved's class loader was not the 3753 // boot class loader. This was to permit different classes with the 3754 // same name to be loaded simultaneously by different loaders 3755 dex_cache->SetResolvedType(type_idx, resolved); 3756 } else { 3757 Thread* self = Thread::Current(); 3758 CHECK(self->IsExceptionPending()) 3759 << "Expected pending exception for failed resolution of: " << descriptor; 3760 // Convert a ClassNotFoundException to a NoClassDefFoundError. 3761 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 3762 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 3763 Thread::Current()->ClearException(); 3764 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 3765 self->GetException(NULL)->SetCause(cause.get()); 3766 } 3767 } 3768 } 3769 return resolved; 3770} 3771 3772mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 3773 uint32_t method_idx, 3774 mirror::DexCache* dex_cache, 3775 mirror::ClassLoader* class_loader, 3776 const mirror::ArtMethod* referrer, 3777 InvokeType type) { 3778 DCHECK(dex_cache != NULL); 3779 // Check for hit in the dex cache. 3780 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 3781 if (resolved != NULL) { 3782 return resolved; 3783 } 3784 // Fail, get the declaring class. 3785 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 3786 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 3787 if (klass == NULL) { 3788 DCHECK(Thread::Current()->IsExceptionPending()); 3789 return NULL; 3790 } 3791 // Scan using method_idx, this saves string compares but will only hit for matching dex 3792 // caches/files. 3793 switch (type) { 3794 case kDirect: // Fall-through. 3795 case kStatic: 3796 resolved = klass->FindDirectMethod(dex_cache, method_idx); 3797 break; 3798 case kInterface: 3799 resolved = klass->FindInterfaceMethod(dex_cache, method_idx); 3800 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 3801 break; 3802 case kSuper: // Fall-through. 3803 case kVirtual: 3804 resolved = klass->FindVirtualMethod(dex_cache, method_idx); 3805 break; 3806 default: 3807 LOG(FATAL) << "Unreachable - invocation type: " << type; 3808 } 3809 if (resolved == NULL) { 3810 // Search by name, which works across dex files. 3811 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 3812 std::string signature(dex_file.CreateMethodSignature(method_id.proto_idx_, NULL)); 3813 switch (type) { 3814 case kDirect: // Fall-through. 3815 case kStatic: 3816 resolved = klass->FindDirectMethod(name, signature); 3817 break; 3818 case kInterface: 3819 resolved = klass->FindInterfaceMethod(name, signature); 3820 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 3821 break; 3822 case kSuper: // Fall-through. 3823 case kVirtual: 3824 resolved = klass->FindVirtualMethod(name, signature); 3825 break; 3826 } 3827 } 3828 if (resolved != NULL) { 3829 // We found a method, check for incompatible class changes. 3830 if (resolved->CheckIncompatibleClassChange(type)) { 3831 resolved = NULL; 3832 } 3833 } 3834 if (resolved != NULL) { 3835 // Be a good citizen and update the dex cache to speed subsequent calls. 3836 dex_cache->SetResolvedMethod(method_idx, resolved); 3837 return resolved; 3838 } else { 3839 // We failed to find the method which means either an access error, an incompatible class 3840 // change, or no such method. First try to find the method among direct and virtual methods. 3841 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 3842 std::string signature(dex_file.CreateMethodSignature(method_id.proto_idx_, NULL)); 3843 switch (type) { 3844 case kDirect: 3845 case kStatic: 3846 resolved = klass->FindVirtualMethod(name, signature); 3847 break; 3848 case kInterface: 3849 case kVirtual: 3850 case kSuper: 3851 resolved = klass->FindDirectMethod(name, signature); 3852 break; 3853 } 3854 3855 // If we found something, check that it can be accessed by the referrer. 3856 if (resolved != NULL && referrer != NULL) { 3857 mirror::Class* methods_class = resolved->GetDeclaringClass(); 3858 mirror::Class* referring_class = referrer->GetDeclaringClass(); 3859 if (!referring_class->CanAccess(methods_class)) { 3860 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 3861 referrer, resolved, type); 3862 return NULL; 3863 } else if (!referring_class->CanAccessMember(methods_class, 3864 resolved->GetAccessFlags())) { 3865 ThrowIllegalAccessErrorMethod(referring_class, resolved); 3866 return NULL; 3867 } 3868 } 3869 3870 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 3871 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 3872 switch (type) { 3873 case kDirect: 3874 case kStatic: 3875 if (resolved != NULL) { 3876 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 3877 } else { 3878 resolved = klass->FindInterfaceMethod(name, signature); 3879 if (resolved != NULL) { 3880 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 3881 } else { 3882 ThrowNoSuchMethodError(type, klass, name, signature); 3883 } 3884 } 3885 break; 3886 case kInterface: 3887 if (resolved != NULL) { 3888 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 3889 } else { 3890 resolved = klass->FindVirtualMethod(name, signature); 3891 if (resolved != NULL) { 3892 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 3893 } else { 3894 ThrowNoSuchMethodError(type, klass, name, signature); 3895 } 3896 } 3897 break; 3898 case kSuper: 3899 ThrowNoSuchMethodError(type, klass, name, signature); 3900 break; 3901 case kVirtual: 3902 if (resolved != NULL) { 3903 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 3904 } else { 3905 resolved = klass->FindInterfaceMethod(name, signature); 3906 if (resolved != NULL) { 3907 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 3908 } else { 3909 ThrowNoSuchMethodError(type, klass, name, signature); 3910 } 3911 } 3912 break; 3913 } 3914 DCHECK(Thread::Current()->IsExceptionPending()); 3915 return NULL; 3916 } 3917} 3918 3919mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, 3920 uint32_t field_idx, 3921 mirror::DexCache* dex_cache, 3922 mirror::ClassLoader* class_loader, 3923 bool is_static) { 3924 DCHECK(dex_cache != NULL); 3925 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 3926 if (resolved != NULL) { 3927 return resolved; 3928 } 3929 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 3930 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 3931 if (klass == NULL) { 3932 DCHECK(Thread::Current()->IsExceptionPending()); 3933 return NULL; 3934 } 3935 3936 if (is_static) { 3937 resolved = klass->FindStaticField(dex_cache, field_idx); 3938 } else { 3939 resolved = klass->FindInstanceField(dex_cache, field_idx); 3940 } 3941 3942 if (resolved == NULL) { 3943 const char* name = dex_file.GetFieldName(field_id); 3944 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 3945 if (is_static) { 3946 resolved = klass->FindStaticField(name, type); 3947 } else { 3948 resolved = klass->FindInstanceField(name, type); 3949 } 3950 if (resolved == NULL) { 3951 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 3952 return NULL; 3953 } 3954 } 3955 dex_cache->SetResolvedField(field_idx, resolved); 3956 return resolved; 3957} 3958 3959mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 3960 uint32_t field_idx, 3961 mirror::DexCache* dex_cache, 3962 mirror::ClassLoader* class_loader) { 3963 DCHECK(dex_cache != NULL); 3964 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 3965 if (resolved != NULL) { 3966 return resolved; 3967 } 3968 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 3969 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 3970 if (klass == NULL) { 3971 DCHECK(Thread::Current()->IsExceptionPending()); 3972 return NULL; 3973 } 3974 3975 const char* name = dex_file.GetFieldName(field_id); 3976 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 3977 resolved = klass->FindField(name, type); 3978 if (resolved != NULL) { 3979 dex_cache->SetResolvedField(field_idx, resolved); 3980 } else { 3981 ThrowNoSuchFieldError("", klass, type, name); 3982 } 3983 return resolved; 3984} 3985 3986const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 3987 uint32_t* length) { 3988 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 3989 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 3990 const DexFile& dex_file = *dex_cache->GetDexFile(); 3991 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 3992 return dex_file.GetMethodShorty(method_id, length); 3993} 3994 3995void ClassLinker::DumpAllClasses(int flags) const { 3996 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 3997 // lock held, because it might need to resolve a field's type, which would try to take the lock. 3998 std::vector<mirror::Class*> all_classes; 3999 { 4000 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4001 for (const std::pair<size_t, mirror::Class*>& it : classes_) { 4002 all_classes.push_back(it.second); 4003 } 4004 for (const std::pair<size_t, mirror::Class*>& it : image_classes_) { 4005 all_classes.push_back(it.second); 4006 } 4007 } 4008 4009 for (size_t i = 0; i < all_classes.size(); ++i) { 4010 all_classes[i]->DumpClass(std::cerr, flags); 4011 } 4012} 4013 4014void ClassLinker::DumpForSigQuit(std::ostream& os) const { 4015 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4016 os << "Loaded classes: " << image_classes_.size() << " image classes; " 4017 << classes_.size() << " allocated classes\n"; 4018} 4019 4020size_t ClassLinker::NumLoadedClasses() const { 4021 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4022 return classes_.size() + image_classes_.size(); 4023} 4024 4025pid_t ClassLinker::GetClassesLockOwner() { 4026 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4027} 4028 4029pid_t ClassLinker::GetDexLockOwner() { 4030 return dex_lock_.GetExclusiveOwnerTid(); 4031} 4032 4033void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4034 DCHECK(!init_done_); 4035 4036 DCHECK(klass != NULL); 4037 DCHECK(klass->GetClassLoader() == NULL); 4038 4039 DCHECK(class_roots_ != NULL); 4040 DCHECK(class_roots_->Get(class_root) == NULL); 4041 class_roots_->Set(class_root, klass); 4042} 4043 4044} // namespace art 4045