class_linker.cc revision 0f40ac31134d9ae0f059d4c448165599dc8459c1
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <fcntl.h> 20#include <sys/file.h> 21#include <sys/stat.h> 22#include <sys/types.h> 23#include <sys/wait.h> 24 25#include <deque> 26#include <string> 27#include <utility> 28#include <vector> 29 30#include "base/casts.h" 31#include "base/logging.h" 32#include "base/stl_util.h" 33#include "base/unix_file/fd_file.h" 34#include "class_linker-inl.h" 35#include "debugger.h" 36#include "dex_file-inl.h" 37#include "gc/accounting/card_table-inl.h" 38#include "gc/accounting/heap_bitmap.h" 39#include "gc/heap.h" 40#include "gc/space/image_space.h" 41#include "intern_table.h" 42#include "interpreter/interpreter.h" 43#include "leb128.h" 44#include "oat.h" 45#include "oat_file.h" 46#include "mirror/art_field-inl.h" 47#include "mirror/art_method-inl.h" 48#include "mirror/class.h" 49#include "mirror/class-inl.h" 50#include "mirror/class_loader.h" 51#include "mirror/dex_cache-inl.h" 52#include "mirror/iftable-inl.h" 53#include "mirror/object-inl.h" 54#include "mirror/object_array-inl.h" 55#include "mirror/proxy.h" 56#include "mirror/stack_trace_element.h" 57#include "object_utils.h" 58#include "os.h" 59#include "runtime.h" 60#include "entrypoints/entrypoint_utils.h" 61#include "ScopedLocalRef.h" 62#include "scoped_thread_state_change.h" 63#include "sirt_ref.h" 64#include "stack_indirect_reference_table.h" 65#include "thread.h" 66#include "UniquePtr.h" 67#include "utils.h" 68#include "verifier/method_verifier.h" 69#include "well_known_classes.h" 70 71namespace art { 72 73static void ThrowNoClassDefFoundError(const char* fmt, ...) 74 __attribute__((__format__(__printf__, 1, 2))) 75 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 76static void ThrowNoClassDefFoundError(const char* fmt, ...) { 77 va_list args; 78 va_start(args, fmt); 79 Thread* self = Thread::Current(); 80 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 81 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 82 va_end(args); 83} 84 85static void ThrowEarlierClassFailure(mirror::Class* c) 86 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 87 // The class failed to initialize on a previous attempt, so we want to throw 88 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 89 // failed in verification, in which case v2 5.4.1 says we need to re-throw 90 // the previous error. 91 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 92 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 93 } 94 95 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 96 Thread* self = Thread::Current(); 97 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 98 if (c->GetVerifyErrorClass() != NULL) { 99 // TODO: change the verifier to store an _instance_, with a useful detail message? 100 ClassHelper ve_ch(c->GetVerifyErrorClass()); 101 self->ThrowNewException(throw_location, ve_ch.GetDescriptor(), PrettyDescriptor(c).c_str()); 102 } else { 103 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 104 PrettyDescriptor(c).c_str()); 105 } 106} 107 108static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 109 Thread* self = Thread::Current(); 110 JNIEnv* env = self->GetJniEnv(); 111 112 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 113 CHECK(cause.get() != NULL); 114 115 env->ExceptionClear(); 116 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 117 env->Throw(cause.get()); 118 119 // We only wrap non-Error exceptions; an Error can just be used as-is. 120 if (!is_error) { 121 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 122 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 123 } 124} 125 126static size_t Hash(const char* s) { 127 // This is the java.lang.String hashcode for convenience, not interoperability. 128 size_t hash = 0; 129 for (; *s != '\0'; ++s) { 130 hash = hash * 31 + *s; 131 } 132 return hash; 133} 134 135const char* ClassLinker::class_roots_descriptors_[] = { 136 "Ljava/lang/Class;", 137 "Ljava/lang/Object;", 138 "[Ljava/lang/Class;", 139 "[Ljava/lang/Object;", 140 "Ljava/lang/String;", 141 "Ljava/lang/DexCache;", 142 "Ljava/lang/ref/Reference;", 143 "Ljava/lang/reflect/ArtField;", 144 "Ljava/lang/reflect/ArtMethod;", 145 "Ljava/lang/reflect/Proxy;", 146 "[Ljava/lang/String;", 147 "[Ljava/lang/reflect/ArtField;", 148 "[Ljava/lang/reflect/ArtMethod;", 149 "Ljava/lang/ClassLoader;", 150 "Ljava/lang/Throwable;", 151 "Ljava/lang/ClassNotFoundException;", 152 "Ljava/lang/StackTraceElement;", 153 "Z", 154 "B", 155 "C", 156 "D", 157 "F", 158 "I", 159 "J", 160 "S", 161 "V", 162 "[Z", 163 "[B", 164 "[C", 165 "[D", 166 "[F", 167 "[I", 168 "[J", 169 "[S", 170 "[Ljava/lang/StackTraceElement;", 171}; 172 173ClassLinker* ClassLinker::CreateFromCompiler(const std::vector<const DexFile*>& boot_class_path, 174 InternTable* intern_table) { 175 CHECK_NE(boot_class_path.size(), 0U); 176 UniquePtr<ClassLinker> class_linker(new ClassLinker(intern_table)); 177 class_linker->InitFromCompiler(boot_class_path); 178 return class_linker.release(); 179} 180 181ClassLinker* ClassLinker::CreateFromImage(InternTable* intern_table) { 182 UniquePtr<ClassLinker> class_linker(new ClassLinker(intern_table)); 183 class_linker->InitFromImage(); 184 return class_linker.release(); 185} 186 187ClassLinker::ClassLinker(InternTable* intern_table) 188 // dex_lock_ is recursive as it may be used in stack dumping. 189 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 190 class_roots_(NULL), 191 array_iftable_(NULL), 192 init_done_(false), 193 is_dirty_(false), 194 intern_table_(intern_table), 195 portable_resolution_trampoline_(NULL), 196 quick_resolution_trampoline_(NULL) { 197 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 198} 199 200void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 201 VLOG(startup) << "ClassLinker::Init"; 202 CHECK(Runtime::Current()->IsCompiler()); 203 204 CHECK(!init_done_); 205 206 // java_lang_Class comes first, it's needed for AllocClass 207 Thread* self = Thread::Current(); 208 gc::Heap* heap = Runtime::Current()->GetHeap(); 209 SirtRef<mirror::Class> 210 java_lang_Class(self, 211 down_cast<mirror::Class*>(heap->AllocObject(self, NULL, 212 sizeof(mirror::ClassClass)))); 213 CHECK(java_lang_Class.get() != NULL); 214 mirror::Class::SetClassClass(java_lang_Class.get()); 215 java_lang_Class->SetClass(java_lang_Class.get()); 216 java_lang_Class->SetClassSize(sizeof(mirror::ClassClass)); 217 // AllocClass(mirror::Class*) can now be used 218 219 // Class[] is used for reflection support. 220 SirtRef<mirror::Class> class_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 221 class_array_class->SetComponentType(java_lang_Class.get()); 222 223 // java_lang_Object comes next so that object_array_class can be created. 224 SirtRef<mirror::Class> java_lang_Object(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 225 CHECK(java_lang_Object.get() != NULL); 226 // backfill Object as the super class of Class. 227 java_lang_Class->SetSuperClass(java_lang_Object.get()); 228 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded); 229 230 // Object[] next to hold class roots. 231 SirtRef<mirror::Class> object_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 232 object_array_class->SetComponentType(java_lang_Object.get()); 233 234 // Setup the char class to be used for char[]. 235 SirtRef<mirror::Class> char_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 236 237 // Setup the char[] class to be used for String. 238 SirtRef<mirror::Class> char_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 239 char_array_class->SetComponentType(char_class.get()); 240 mirror::CharArray::SetArrayClass(char_array_class.get()); 241 242 // Setup String. 243 SirtRef<mirror::Class> java_lang_String(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::StringClass))); 244 mirror::String::SetClass(java_lang_String.get()); 245 java_lang_String->SetObjectSize(sizeof(mirror::String)); 246 java_lang_String->SetStatus(mirror::Class::kStatusResolved); 247 248 // Create storage for root classes, save away our work so far (requires descriptors). 249 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.get(), kClassRootsMax); 250 CHECK(class_roots_ != NULL); 251 SetClassRoot(kJavaLangClass, java_lang_Class.get()); 252 SetClassRoot(kJavaLangObject, java_lang_Object.get()); 253 SetClassRoot(kClassArrayClass, class_array_class.get()); 254 SetClassRoot(kObjectArrayClass, object_array_class.get()); 255 SetClassRoot(kCharArrayClass, char_array_class.get()); 256 SetClassRoot(kJavaLangString, java_lang_String.get()); 257 258 // Setup the primitive type classes. 259 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 260 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 261 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 262 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 263 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 264 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 265 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 266 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 267 268 // Create array interface entries to populate once we can load system classes. 269 array_iftable_ = AllocIfTable(self, 2); 270 271 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 272 SirtRef<mirror::Class> int_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 273 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 274 mirror::IntArray::SetArrayClass(int_array_class.get()); 275 SetClassRoot(kIntArrayClass, int_array_class.get()); 276 277 // now that these are registered, we can use AllocClass() and AllocObjectArray 278 279 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 280 SirtRef<mirror::Class> 281 java_lang_DexCache(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::DexCacheClass))); 282 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.get()); 283 java_lang_DexCache->SetObjectSize(sizeof(mirror::DexCacheClass)); 284 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved); 285 286 // Constructor, Field, Method, and AbstractMethod are necessary so that FindClass can link members. 287 SirtRef<mirror::Class> java_lang_reflect_ArtField(self, AllocClass(self, java_lang_Class.get(), 288 sizeof(mirror::ArtFieldClass))); 289 CHECK(java_lang_reflect_ArtField.get() != NULL); 290 java_lang_reflect_ArtField->SetObjectSize(sizeof(mirror::ArtField)); 291 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.get()); 292 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved); 293 mirror::ArtField::SetClass(java_lang_reflect_ArtField.get()); 294 295 SirtRef<mirror::Class> java_lang_reflect_ArtMethod(self, AllocClass(self, java_lang_Class.get(), 296 sizeof(mirror::ArtMethodClass))); 297 CHECK(java_lang_reflect_ArtMethod.get() != NULL); 298 java_lang_reflect_ArtMethod->SetObjectSize(sizeof(mirror::ArtMethod)); 299 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.get()); 300 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved); 301 302 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.get()); 303 304 // Set up array classes for string, field, method 305 SirtRef<mirror::Class> object_array_string(self, AllocClass(self, java_lang_Class.get(), 306 sizeof(mirror::Class))); 307 object_array_string->SetComponentType(java_lang_String.get()); 308 SetClassRoot(kJavaLangStringArrayClass, object_array_string.get()); 309 310 SirtRef<mirror::Class> object_array_art_method(self, AllocClass(self, java_lang_Class.get(), 311 sizeof(mirror::Class))); 312 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.get()); 313 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.get()); 314 315 SirtRef<mirror::Class> object_array_art_field(self, AllocClass(self, java_lang_Class.get(), 316 sizeof(mirror::Class))); 317 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.get()); 318 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.get()); 319 320 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 321 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 322 // these roots. 323 CHECK_NE(0U, boot_class_path.size()); 324 for (size_t i = 0; i != boot_class_path.size(); ++i) { 325 const DexFile* dex_file = boot_class_path[i]; 326 CHECK(dex_file != NULL); 327 AppendToBootClassPath(*dex_file); 328 } 329 330 // now we can use FindSystemClass 331 332 // run char class through InitializePrimitiveClass to finish init 333 InitializePrimitiveClass(char_class.get(), Primitive::kPrimChar); 334 SetClassRoot(kPrimitiveChar, char_class.get()); // needs descriptor 335 336 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 337 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady); 338 mirror::Class* Object_class = FindSystemClass("Ljava/lang/Object;"); 339 CHECK_EQ(java_lang_Object.get(), Object_class); 340 CHECK_EQ(java_lang_Object->GetObjectSize(), sizeof(mirror::Object)); 341 java_lang_String->SetStatus(mirror::Class::kStatusNotReady); 342 mirror::Class* String_class = FindSystemClass("Ljava/lang/String;"); 343 CHECK_EQ(java_lang_String.get(), String_class); 344 CHECK_EQ(java_lang_String->GetObjectSize(), sizeof(mirror::String)); 345 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady); 346 mirror::Class* DexCache_class = FindSystemClass("Ljava/lang/DexCache;"); 347 CHECK_EQ(java_lang_String.get(), String_class); 348 CHECK_EQ(java_lang_DexCache.get(), DexCache_class); 349 CHECK_EQ(java_lang_DexCache->GetObjectSize(), sizeof(mirror::DexCache)); 350 351 // Setup the primitive array type classes - can't be done until Object has a vtable. 352 SetClassRoot(kBooleanArrayClass, FindSystemClass("[Z")); 353 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 354 355 SetClassRoot(kByteArrayClass, FindSystemClass("[B")); 356 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 357 358 mirror::Class* found_char_array_class = FindSystemClass("[C"); 359 CHECK_EQ(char_array_class.get(), found_char_array_class); 360 361 SetClassRoot(kShortArrayClass, FindSystemClass("[S")); 362 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 363 364 mirror::Class* found_int_array_class = FindSystemClass("[I"); 365 CHECK_EQ(int_array_class.get(), found_int_array_class); 366 367 SetClassRoot(kLongArrayClass, FindSystemClass("[J")); 368 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 369 370 SetClassRoot(kFloatArrayClass, FindSystemClass("[F")); 371 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 372 373 SetClassRoot(kDoubleArrayClass, FindSystemClass("[D")); 374 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 375 376 mirror::Class* found_class_array_class = FindSystemClass("[Ljava/lang/Class;"); 377 CHECK_EQ(class_array_class.get(), found_class_array_class); 378 379 mirror::Class* found_object_array_class = FindSystemClass("[Ljava/lang/Object;"); 380 CHECK_EQ(object_array_class.get(), found_object_array_class); 381 382 // Setup the single, global copy of "iftable". 383 mirror::Class* java_lang_Cloneable = FindSystemClass("Ljava/lang/Cloneable;"); 384 CHECK(java_lang_Cloneable != NULL); 385 mirror::Class* java_io_Serializable = FindSystemClass("Ljava/io/Serializable;"); 386 CHECK(java_io_Serializable != NULL); 387 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 388 // crawl up and explicitly list all of the supers as well. 389 array_iftable_->SetInterface(0, java_lang_Cloneable); 390 array_iftable_->SetInterface(1, java_io_Serializable); 391 392 // Sanity check Class[] and Object[]'s interfaces. 393 ClassHelper kh(class_array_class.get(), this); 394 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 395 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 396 kh.ChangeClass(object_array_class.get()); 397 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 398 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 399 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 400 // dex_cache_ fields and register them in classes_. 401 mirror::Class* Class_class = FindSystemClass("Ljava/lang/Class;"); 402 CHECK_EQ(java_lang_Class.get(), Class_class); 403 404 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady); 405 mirror::Class* Art_method_class = FindSystemClass("Ljava/lang/reflect/ArtMethod;"); 406 CHECK_EQ(java_lang_reflect_ArtMethod.get(), Art_method_class); 407 408 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady); 409 mirror::Class* Art_field_class = FindSystemClass("Ljava/lang/reflect/ArtField;"); 410 CHECK_EQ(java_lang_reflect_ArtField.get(), Art_field_class); 411 412 mirror::Class* String_array_class = FindSystemClass(class_roots_descriptors_[kJavaLangStringArrayClass]); 413 CHECK_EQ(object_array_string.get(), String_array_class); 414 415 mirror::Class* Art_method_array_class = 416 FindSystemClass(class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 417 CHECK_EQ(object_array_art_method.get(), Art_method_array_class); 418 419 mirror::Class* Art_field_array_class = 420 FindSystemClass(class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 421 CHECK_EQ(object_array_art_field.get(), Art_field_array_class); 422 423 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 424 425 // Create java.lang.reflect.Proxy root. 426 mirror::Class* java_lang_reflect_Proxy = FindSystemClass("Ljava/lang/reflect/Proxy;"); 427 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 428 429 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 430 mirror::Class* java_lang_ref_Reference = FindSystemClass("Ljava/lang/ref/Reference;"); 431 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference); 432 mirror::Class* java_lang_ref_FinalizerReference = FindSystemClass("Ljava/lang/ref/FinalizerReference;"); 433 java_lang_ref_FinalizerReference->SetAccessFlags( 434 java_lang_ref_FinalizerReference->GetAccessFlags() | 435 kAccClassIsReference | kAccClassIsFinalizerReference); 436 mirror::Class* java_lang_ref_PhantomReference = FindSystemClass("Ljava/lang/ref/PhantomReference;"); 437 java_lang_ref_PhantomReference->SetAccessFlags( 438 java_lang_ref_PhantomReference->GetAccessFlags() | 439 kAccClassIsReference | kAccClassIsPhantomReference); 440 mirror::Class* java_lang_ref_SoftReference = FindSystemClass("Ljava/lang/ref/SoftReference;"); 441 java_lang_ref_SoftReference->SetAccessFlags( 442 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 443 mirror::Class* java_lang_ref_WeakReference = FindSystemClass("Ljava/lang/ref/WeakReference;"); 444 java_lang_ref_WeakReference->SetAccessFlags( 445 java_lang_ref_WeakReference->GetAccessFlags() | 446 kAccClassIsReference | kAccClassIsWeakReference); 447 448 // Setup the ClassLoader, verifying the object_size_. 449 mirror::Class* java_lang_ClassLoader = FindSystemClass("Ljava/lang/ClassLoader;"); 450 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), sizeof(mirror::ClassLoader)); 451 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 452 453 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 454 // java.lang.StackTraceElement as a convenience. 455 SetClassRoot(kJavaLangThrowable, FindSystemClass("Ljava/lang/Throwable;")); 456 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 457 SetClassRoot(kJavaLangClassNotFoundException, FindSystemClass("Ljava/lang/ClassNotFoundException;")); 458 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass("Ljava/lang/StackTraceElement;")); 459 SetClassRoot(kJavaLangStackTraceElementArrayClass, FindSystemClass("[Ljava/lang/StackTraceElement;")); 460 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 461 462 FinishInit(); 463 464 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 465} 466 467void ClassLinker::FinishInit() { 468 VLOG(startup) << "ClassLinker::FinishInit entering"; 469 470 // Let the heap know some key offsets into java.lang.ref instances 471 // Note: we hard code the field indexes here rather than using FindInstanceField 472 // as the types of the field can't be resolved prior to the runtime being 473 // fully initialized 474 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 475 mirror::Class* java_lang_ref_ReferenceQueue = FindSystemClass("Ljava/lang/ref/ReferenceQueue;"); 476 mirror::Class* java_lang_ref_FinalizerReference = FindSystemClass("Ljava/lang/ref/FinalizerReference;"); 477 478 const DexFile& java_lang_dex = *java_lang_ref_Reference->GetDexCache()->GetDexFile(); 479 480 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 481 FieldHelper fh(pendingNext, this); 482 CHECK_STREQ(fh.GetName(), "pendingNext"); 483 CHECK_EQ(java_lang_dex.GetFieldId(pendingNext->GetDexFieldIndex()).type_idx_, 484 java_lang_ref_Reference->GetDexTypeIndex()); 485 486 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 487 fh.ChangeField(queue); 488 CHECK_STREQ(fh.GetName(), "queue"); 489 CHECK_EQ(java_lang_dex.GetFieldId(queue->GetDexFieldIndex()).type_idx_, 490 java_lang_ref_ReferenceQueue->GetDexTypeIndex()); 491 492 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 493 fh.ChangeField(queueNext); 494 CHECK_STREQ(fh.GetName(), "queueNext"); 495 CHECK_EQ(java_lang_dex.GetFieldId(queueNext->GetDexFieldIndex()).type_idx_, 496 java_lang_ref_Reference->GetDexTypeIndex()); 497 498 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 499 fh.ChangeField(referent); 500 CHECK_STREQ(fh.GetName(), "referent"); 501 CHECK_EQ(java_lang_dex.GetFieldId(referent->GetDexFieldIndex()).type_idx_, 502 GetClassRoot(kJavaLangObject)->GetDexTypeIndex()); 503 504 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 505 fh.ChangeField(zombie); 506 CHECK_STREQ(fh.GetName(), "zombie"); 507 CHECK_EQ(java_lang_dex.GetFieldId(zombie->GetDexFieldIndex()).type_idx_, 508 GetClassRoot(kJavaLangObject)->GetDexTypeIndex()); 509 510 gc::Heap* heap = Runtime::Current()->GetHeap(); 511 heap->SetReferenceOffsets(referent->GetOffset(), 512 queue->GetOffset(), 513 queueNext->GetOffset(), 514 pendingNext->GetOffset(), 515 zombie->GetOffset()); 516 517 // ensure all class_roots_ are initialized 518 for (size_t i = 0; i < kClassRootsMax; i++) { 519 ClassRoot class_root = static_cast<ClassRoot>(i); 520 mirror::Class* klass = GetClassRoot(class_root); 521 CHECK(klass != NULL); 522 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 523 // note SetClassRoot does additional validation. 524 // if possible add new checks there to catch errors early 525 } 526 527 CHECK(array_iftable_ != NULL); 528 529 // disable the slow paths in FindClass and CreatePrimitiveClass now 530 // that Object, Class, and Object[] are setup 531 init_done_ = true; 532 533 VLOG(startup) << "ClassLinker::FinishInit exiting"; 534} 535 536void ClassLinker::RunRootClinits() { 537 Thread* self = Thread::Current(); 538 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 539 mirror::Class* c = GetClassRoot(ClassRoot(i)); 540 if (!c->IsArrayClass() && !c->IsPrimitive()) { 541 EnsureInitialized(GetClassRoot(ClassRoot(i)), true, true); 542 self->AssertNoPendingException(); 543 } 544 } 545} 546 547bool ClassLinker::GenerateOatFile(const std::string& dex_filename, 548 int oat_fd, 549 const std::string& oat_cache_filename) { 550 std::string dex2oat_string(GetAndroidRoot()); 551 dex2oat_string += (kIsDebugBuild ? "/bin/dex2oatd" : "/bin/dex2oat"); 552 const char* dex2oat = dex2oat_string.c_str(); 553 554 const char* class_path = Runtime::Current()->GetClassPathString().c_str(); 555 556 gc::Heap* heap = Runtime::Current()->GetHeap(); 557 std::string boot_image_option_string("--boot-image="); 558 boot_image_option_string += heap->GetImageSpace()->GetImageFilename(); 559 const char* boot_image_option = boot_image_option_string.c_str(); 560 561 std::string dex_file_option_string("--dex-file="); 562 dex_file_option_string += dex_filename; 563 const char* dex_file_option = dex_file_option_string.c_str(); 564 565 std::string oat_fd_option_string("--oat-fd="); 566 StringAppendF(&oat_fd_option_string, "%d", oat_fd); 567 const char* oat_fd_option = oat_fd_option_string.c_str(); 568 569 std::string oat_location_option_string("--oat-location="); 570 oat_location_option_string += oat_cache_filename; 571 const char* oat_location_option = oat_location_option_string.c_str(); 572 573 std::string oat_compiler_filter_string("-compiler-filter:"); 574 switch (Runtime::Current()->GetCompilerFilter()) { 575 case Runtime::kInterpretOnly: 576 oat_compiler_filter_string += "interpret-only"; 577 break; 578 case Runtime::kDeferCompilation: 579 oat_compiler_filter_string += "defer-compilation"; 580 break; 581 case Runtime::kSpace: 582 oat_compiler_filter_string += "space"; 583 break; 584 case Runtime::kBalanced: 585 oat_compiler_filter_string += "balanced"; 586 break; 587 case Runtime::kSpeed: 588 oat_compiler_filter_string += "speed"; 589 break; 590 default: 591 LOG(FATAL) << "Unexpected case."; 592 } 593 const char* oat_compiler_filter_option = oat_compiler_filter_string.c_str(); 594 595 // fork and exec dex2oat 596 pid_t pid = fork(); 597 if (pid == 0) { 598 // no allocation allowed between fork and exec 599 600 // change process groups, so we don't get reaped by ProcessManager 601 setpgid(0, 0); 602 603 VLOG(class_linker) << dex2oat 604 << " --runtime-arg -Xms64m" 605 << " --runtime-arg -Xmx64m" 606 << " --runtime-arg -classpath" 607 << " --runtime-arg " << class_path 608 << " --runtime-arg " << oat_compiler_filter_option 609#if !defined(ART_TARGET) 610 << " --host" 611#endif 612 << " " << boot_image_option 613 << " " << dex_file_option 614 << " " << oat_fd_option 615 << " " << oat_location_option; 616 617 execl(dex2oat, dex2oat, 618 "--runtime-arg", "-Xms64m", 619 "--runtime-arg", "-Xmx64m", 620 "--runtime-arg", "-classpath", 621 "--runtime-arg", class_path, 622 "--runtime-arg", oat_compiler_filter_option, 623#if !defined(ART_TARGET) 624 "--host", 625#endif 626 boot_image_option, 627 dex_file_option, 628 oat_fd_option, 629 oat_location_option, 630 NULL); 631 632 PLOG(FATAL) << "execl(" << dex2oat << ") failed"; 633 return false; 634 } else { 635 // wait for dex2oat to finish 636 int status; 637 pid_t got_pid = TEMP_FAILURE_RETRY(waitpid(pid, &status, 0)); 638 if (got_pid != pid) { 639 PLOG(ERROR) << "waitpid failed: wanted " << pid << ", got " << got_pid; 640 return false; 641 } 642 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { 643 LOG(ERROR) << dex2oat << " failed with dex-file=" << dex_filename; 644 return false; 645 } 646 } 647 return true; 648} 649 650void ClassLinker::RegisterOatFile(const OatFile& oat_file) { 651 WriterMutexLock mu(Thread::Current(), dex_lock_); 652 RegisterOatFileLocked(oat_file); 653} 654 655void ClassLinker::RegisterOatFileLocked(const OatFile& oat_file) { 656 dex_lock_.AssertExclusiveHeld(Thread::Current()); 657 if (kIsDebugBuild) { 658 for (size_t i = 0; i < oat_files_.size(); ++i) { 659 CHECK_NE(&oat_file, oat_files_[i]) << oat_file.GetLocation(); 660 } 661 } 662 oat_files_.push_back(&oat_file); 663} 664 665OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 666 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 667 OatFile& oat_file = space->ReleaseOatFile(); 668 WriterMutexLock mu(Thread::Current(), dex_lock_); 669 RegisterOatFileLocked(oat_file); 670 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 671 return oat_file; 672} 673 674const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 675 ReaderMutexLock mu(Thread::Current(), dex_lock_); 676 return FindOpenedOatFileFromDexLocation(dex_file.GetLocation()); 677} 678 679const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation(const std::string& dex_location) { 680 for (size_t i = 0; i < oat_files_.size(); i++) { 681 const OatFile* oat_file = oat_files_[i]; 682 DCHECK(oat_file != NULL); 683 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, false); 684 if (oat_dex_file != NULL) { 685 return oat_file; 686 } 687 } 688 return NULL; 689} 690 691const DexFile* ClassLinker::FindDexFileInOatLocation(const std::string& dex_location, 692 uint32_t dex_location_checksum, 693 const std::string& oat_location) { 694 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 695 !Runtime::Current()->IsCompiler())); 696 if (oat_file.get() == NULL) { 697 return NULL; 698 } 699 Runtime* runtime = Runtime::Current(); 700 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 701 if (oat_file->GetOatHeader().GetImageFileLocationOatChecksum() != image_header.GetOatChecksum()) { 702 return NULL; 703 } 704 if (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() 705 != reinterpret_cast<uint32_t>(image_header.GetOatDataBegin())) { 706 return NULL; 707 } 708 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location); 709 if (oat_dex_file == NULL) { 710 return NULL; 711 } 712 if (oat_dex_file->GetDexFileLocationChecksum() != dex_location_checksum) { 713 return NULL; 714 } 715 RegisterOatFileLocked(*oat_file.release()); 716 return oat_dex_file->OpenDexFile(); 717} 718 719const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation(const std::string& dex_location, 720 const std::string& oat_location) { 721 WriterMutexLock mu(Thread::Current(), dex_lock_); 722 return FindOrCreateOatFileForDexLocationLocked(dex_location, oat_location); 723} 724 725const DexFile* ClassLinker::FindOrCreateOatFileForDexLocationLocked(const std::string& dex_location, 726 const std::string& oat_location) { 727 uint32_t dex_location_checksum; 728 if (!DexFile::GetChecksum(dex_location, dex_location_checksum)) { 729 LOG(ERROR) << "Failed to compute checksum '" << dex_location << "'"; 730 return NULL; 731 } 732 733 // Check if we already have an up-to-date output file 734 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, 735 dex_location_checksum, 736 oat_location); 737 if (dex_file != NULL) { 738 return dex_file; 739 } 740 741 // Generate the output oat file for the dex file 742 UniquePtr<File> file(OS::OpenFile(oat_location.c_str(), true)); 743 if (file.get() == NULL) { 744 LOG(ERROR) << "Failed to create oat file: " << oat_location; 745 return NULL; 746 } 747 if (!GenerateOatFile(dex_location, file->Fd(), oat_location)) { 748 LOG(ERROR) << "Failed to generate oat file: " << oat_location; 749 return NULL; 750 } 751 const OatFile* oat_file = OatFile::Open(oat_location, oat_location, NULL, 752 !Runtime::Current()->IsCompiler()); 753 if (oat_file == NULL) { 754 LOG(ERROR) << "Failed to open generated oat file: " << oat_location; 755 return NULL; 756 } 757 RegisterOatFileLocked(*oat_file); 758 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location); 759 if (oat_dex_file == NULL) { 760 LOG(ERROR) << "Failed to find dex file in generated oat file: " << oat_location; 761 return NULL; 762 } 763 return oat_dex_file->OpenDexFile(); 764} 765 766bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 767 const std::string& dex_location, 768 uint32_t dex_location_checksum) { 769 Runtime* runtime = Runtime::Current(); 770 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 771 uint32_t image_oat_checksum = image_header.GetOatChecksum(); 772 uint32_t image_oat_data_begin = reinterpret_cast<uint32_t>(image_header.GetOatDataBegin()); 773 bool image_check = ((oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum) 774 && (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 775 776 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location); 777 if (oat_dex_file == NULL) { 778 LOG(ERROR) << "oat file " << oat_file->GetLocation() 779 << " does not contain contents for " << dex_location; 780 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 781 for (size_t i = 0; i < oat_dex_files.size(); i++) { 782 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 783 LOG(ERROR) << "oat file " << oat_file->GetLocation() 784 << " contains contents for " << oat_dex_file->GetDexFileLocation(); 785 } 786 return false; 787 } 788 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 789 790 if (image_check && dex_check) { 791 return true; 792 } 793 794 if (!image_check) { 795 std::string image_file(image_header.GetImageRoot( 796 ImageHeader::kOatLocation)->AsString()->ToModifiedUtf8()); 797 LOG(WARNING) << "oat file " << oat_file->GetLocation() 798 << " mismatch ( " << std::hex << oat_file->GetOatHeader().GetImageFileLocationOatChecksum() 799 << ", " << oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() 800 << ") with " << image_file 801 << " (" << image_oat_checksum << ", " << std::hex << image_oat_data_begin << ")"; 802 } 803 if (!dex_check) { 804 LOG(WARNING) << "oat file " << oat_file->GetLocation() 805 << " mismatch ( " << std::hex << oat_dex_file->GetDexFileLocationChecksum() 806 << ") with " << dex_location 807 << " (" << std::hex << dex_location_checksum << ")"; 808 } 809 return false; 810} 811 812const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const OatFile* oat_file, 813 const std::string& dex_location, 814 uint32_t dex_location_checksum) { 815 bool verified = VerifyOatFileChecksums(oat_file, dex_location, dex_location_checksum); 816 if (!verified) { 817 return NULL; 818 } 819 RegisterOatFileLocked(*oat_file); 820 return oat_file->GetOatDexFile(dex_location)->OpenDexFile(); 821} 822 823const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const std::string& dex_location) { 824 WriterMutexLock mu(Thread::Current(), dex_lock_); 825 826 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location); 827 if (open_oat_file != NULL) { 828 return open_oat_file->GetOatDexFile(dex_location)->OpenDexFile(); 829 } 830 831 // Look for an existing file next to dex. for example, for 832 // /foo/bar/baz.jar, look for /foo/bar/baz.odex. 833 std::string odex_filename(OatFile::DexFilenameToOdexFilename(dex_location)); 834 const OatFile* oat_file = FindOatFileFromOatLocationLocked(odex_filename); 835 if (oat_file != NULL) { 836 uint32_t dex_location_checksum; 837 if (!DexFile::GetChecksum(dex_location, dex_location_checksum)) { 838 // If no classes.dex found in dex_location, it has been stripped, assume oat is up-to-date. 839 // This is the common case in user builds for jar's and apk's in the /system directory. 840 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location); 841 CHECK(oat_dex_file != NULL) << odex_filename << " " << dex_location; 842 RegisterOatFileLocked(*oat_file); 843 return oat_dex_file->OpenDexFile(); 844 } 845 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(oat_file, 846 dex_location, 847 dex_location_checksum); 848 if (dex_file != NULL) { 849 return dex_file; 850 } 851 } 852 // Look for an existing file in the dalvik-cache, validating the result if found 853 // not found in /foo/bar/baz.odex? try /data/dalvik-cache/foo@bar@baz.jar@classes.dex 854 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location)); 855 oat_file = FindOatFileFromOatLocationLocked(cache_location); 856 if (oat_file != NULL) { 857 uint32_t dex_location_checksum; 858 if (!DexFile::GetChecksum(dex_location, dex_location_checksum)) { 859 LOG(WARNING) << "Failed to compute checksum: " << dex_location; 860 return NULL; 861 } 862 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(oat_file, 863 dex_location, 864 dex_location_checksum); 865 if (dex_file != NULL) { 866 return dex_file; 867 } 868 if (TEMP_FAILURE_RETRY(unlink(oat_file->GetLocation().c_str())) != 0) { 869 PLOG(FATAL) << "Failed to remove obsolete oat file " << oat_file->GetLocation(); 870 } 871 } 872 LOG(INFO) << "Failed to open oat file from " << odex_filename << " or " << cache_location << "."; 873 874 // Try to generate oat file if it wasn't found or was obsolete. 875 std::string oat_cache_filename(GetDalvikCacheFilenameOrDie(dex_location)); 876 return FindOrCreateOatFileForDexLocationLocked(dex_location, oat_cache_filename); 877} 878 879const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 880 for (size_t i = 0; i < oat_files_.size(); i++) { 881 const OatFile* oat_file = oat_files_[i]; 882 DCHECK(oat_file != NULL); 883 if (oat_file->GetLocation() == oat_location) { 884 return oat_file; 885 } 886 } 887 return NULL; 888} 889 890const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location) { 891 ReaderMutexLock mu(Thread::Current(), dex_lock_); 892 return FindOatFileFromOatLocationLocked(oat_location); 893} 894 895const OatFile* ClassLinker::FindOatFileFromOatLocationLocked(const std::string& oat_location) { 896 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 897 if (oat_file != NULL) { 898 return oat_file; 899 } 900 901 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler()); 902 if (oat_file == NULL) { 903 return NULL; 904 } 905 return oat_file; 906} 907 908static void InitFromImageCallbackCommon(mirror::Object* obj, ClassLinker* class_linker, 909 bool interpret_only_mode) 910 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 911 DCHECK(obj != NULL); 912 DCHECK(class_linker != NULL); 913 914 if (obj->GetClass()->IsStringClass()) { 915 class_linker->GetInternTable()->RegisterStrong(obj->AsString()); 916 } else if (obj->IsClass()) { 917 // Restore class to ClassLinker::classes_ table. 918 mirror::Class* klass = obj->AsClass(); 919 ClassHelper kh(klass, class_linker); 920 mirror::Class* existing = class_linker->InsertClass(kh.GetDescriptor(), klass, true); 921 DCHECK(existing == NULL) << kh.GetDescriptor(); 922 } else if (interpret_only_mode && obj->IsArtMethod()) { 923 mirror::ArtMethod* method = obj->AsArtMethod(); 924 if (!method->IsNative()) { 925 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 926 if (method != Runtime::Current()->GetResolutionMethod()) { 927 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 928 } 929 } 930 } 931} 932 933static void InitFromImageCallback(mirror::Object* obj, void* arg) 934 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 935 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 936 InitFromImageCallbackCommon(obj, class_linker, false); 937} 938 939static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 940 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 941 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 942 InitFromImageCallbackCommon(obj, class_linker, true); 943} 944 945void ClassLinker::InitFromImage() { 946 VLOG(startup) << "ClassLinker::InitFromImage entering"; 947 CHECK(!init_done_); 948 949 gc::Heap* heap = Runtime::Current()->GetHeap(); 950 gc::space::ImageSpace* space = heap->GetImageSpace(); 951 CHECK(space != NULL); 952 OatFile& oat_file = GetImageOatFile(space); 953 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 954 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 955 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 956 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 957 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 958 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 959 mirror::ObjectArray<mirror::DexCache>* dex_caches = 960 dex_caches_object->AsObjectArray<mirror::DexCache>(); 961 962 mirror::ObjectArray<mirror::Class>* class_roots = 963 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>(); 964 class_roots_ = class_roots; 965 966 // Special case of setting up the String class early so that we can test arbitrary objects 967 // as being Strings or not 968 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 969 970 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 971 static_cast<uint32_t>(dex_caches->GetLength())); 972 Thread* self = Thread::Current(); 973 for (int i = 0; i < dex_caches->GetLength(); i++) { 974 SirtRef<mirror::DexCache> dex_cache(self, dex_caches->Get(i)); 975 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 976 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location); 977 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 978 const DexFile* dex_file = oat_dex_file->OpenDexFile(); 979 if (dex_file == NULL) { 980 LOG(FATAL) << "Failed to open dex file " << dex_file_location 981 << " from within oat file " << oat_file.GetLocation(); 982 } 983 984 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 985 986 AppendToBootClassPath(*dex_file, dex_cache); 987 } 988 989 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 990 // bitmap walk. 991 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 992 993 // reinit clases_ table 994 { 995 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 996 heap->FlushAllocStack(); 997 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 998 heap->GetLiveBitmap()->Walk(InitFromImageInterpretOnlyCallback, this); 999 } else { 1000 heap->GetLiveBitmap()->Walk(InitFromImageCallback, this); 1001 } 1002 } 1003 1004 // reinit class_roots_ 1005 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1006 class_roots_ = class_roots; 1007 1008 // reinit array_iftable_ from any array class instance, they should be == 1009 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1010 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1011 // String class root was set above 1012 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1013 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1014 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1015 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1016 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1017 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1018 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1019 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1020 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1021 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1022 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1023 1024 FinishInit(); 1025 1026 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1027} 1028 1029// Keep in sync with InitCallback. Anything we visit, we need to 1030// reinit references to when reinitializing a ClassLinker from a 1031// mapped image. 1032void ClassLinker::VisitRoots(RootVisitor* visitor, void* arg, bool clean_dirty) { 1033 visitor(class_roots_, arg); 1034 Thread* self = Thread::Current(); 1035 { 1036 ReaderMutexLock mu(self, dex_lock_); 1037 for (size_t i = 0; i < dex_caches_.size(); i++) { 1038 visitor(dex_caches_[i], arg); 1039 } 1040 } 1041 1042 { 1043 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 1044 typedef Table::const_iterator It; // TODO: C++0x auto 1045 for (It it = classes_.begin(), end = classes_.end(); it != end; ++it) { 1046 visitor(it->second, arg); 1047 } 1048 1049 // We deliberately ignore the class roots in the image since we 1050 // handle image roots by using the MS/CMS rescanning of dirty cards. 1051 } 1052 1053 visitor(array_iftable_, arg); 1054 if (clean_dirty) { 1055 is_dirty_ = false; 1056 } 1057} 1058 1059void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) const { 1060 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1061 typedef Table::const_iterator It; // TODO: C++0x auto 1062 for (It it = classes_.begin(), end = classes_.end(); it != end; ++it) { 1063 if (!visitor(it->second, arg)) { 1064 return; 1065 } 1066 } 1067 for (It it = image_classes_.begin(), end = image_classes_.end(); it != end; ++it) { 1068 if (!visitor(it->second, arg)) { 1069 return; 1070 } 1071 } 1072} 1073 1074static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1075 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1076 classes->insert(c); 1077 return true; 1078} 1079 1080void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) const { 1081 std::set<mirror::Class*> classes; 1082 VisitClasses(GetClassesVisitor, &classes); 1083 typedef std::set<mirror::Class*>::const_iterator It; // TODO: C++0x auto 1084 for (It it = classes.begin(), end = classes.end(); it != end; ++it) { 1085 if (!visitor(*it, arg)) { 1086 return; 1087 } 1088 } 1089} 1090 1091 1092ClassLinker::~ClassLinker() { 1093 mirror::Class::ResetClass(); 1094 mirror::String::ResetClass(); 1095 mirror::ArtField::ResetClass(); 1096 mirror::ArtMethod::ResetClass(); 1097 mirror::BooleanArray::ResetArrayClass(); 1098 mirror::ByteArray::ResetArrayClass(); 1099 mirror::CharArray::ResetArrayClass(); 1100 mirror::DoubleArray::ResetArrayClass(); 1101 mirror::FloatArray::ResetArrayClass(); 1102 mirror::IntArray::ResetArrayClass(); 1103 mirror::LongArray::ResetArrayClass(); 1104 mirror::ShortArray::ResetArrayClass(); 1105 mirror::Throwable::ResetClass(); 1106 mirror::StackTraceElement::ResetClass(); 1107 STLDeleteElements(&boot_class_path_); 1108 STLDeleteElements(&oat_files_); 1109} 1110 1111mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1112 gc::Heap* heap = Runtime::Current()->GetHeap(); 1113 mirror::Class* dex_cache_class = GetClassRoot(kJavaLangDexCache); 1114 SirtRef<mirror::DexCache> dex_cache(self, 1115 down_cast<mirror::DexCache*>(heap->AllocObject(self, dex_cache_class, 1116 dex_cache_class->GetObjectSize()))); 1117 if (dex_cache.get() == NULL) { 1118 return NULL; 1119 } 1120 SirtRef<mirror::String> 1121 location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str())); 1122 if (location.get() == NULL) { 1123 return NULL; 1124 } 1125 SirtRef<mirror::ObjectArray<mirror::String> > 1126 strings(self, AllocStringArray(self, dex_file.NumStringIds())); 1127 if (strings.get() == NULL) { 1128 return NULL; 1129 } 1130 SirtRef<mirror::ObjectArray<mirror::Class> > 1131 types(self, AllocClassArray(self, dex_file.NumTypeIds())); 1132 if (types.get() == NULL) { 1133 return NULL; 1134 } 1135 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 1136 methods(self, AllocArtMethodArray(self, dex_file.NumMethodIds())); 1137 if (methods.get() == NULL) { 1138 return NULL; 1139 } 1140 SirtRef<mirror::ObjectArray<mirror::ArtField> > 1141 fields(self, AllocArtFieldArray(self, dex_file.NumFieldIds())); 1142 if (fields.get() == NULL) { 1143 return NULL; 1144 } 1145 SirtRef<mirror::ObjectArray<mirror::StaticStorageBase> > 1146 initialized_static_storage(self, 1147 AllocObjectArray<mirror::StaticStorageBase>(self, dex_file.NumTypeIds())); 1148 if (initialized_static_storage.get() == NULL) { 1149 return NULL; 1150 } 1151 1152 dex_cache->Init(&dex_file, 1153 location.get(), 1154 strings.get(), 1155 types.get(), 1156 methods.get(), 1157 fields.get(), 1158 initialized_static_storage.get()); 1159 return dex_cache.get(); 1160} 1161 1162mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1163 size_t class_size) { 1164 DCHECK_GE(class_size, sizeof(mirror::Class)); 1165 gc::Heap* heap = Runtime::Current()->GetHeap(); 1166 SirtRef<mirror::Class> klass(self, 1167 heap->AllocObject(self, java_lang_Class, class_size)->AsClass()); 1168 klass->SetPrimitiveType(Primitive::kPrimNot); // default to not being primitive 1169 klass->SetClassSize(class_size); 1170 return klass.get(); 1171} 1172 1173mirror::Class* ClassLinker::AllocClass(Thread* self, size_t class_size) { 1174 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1175} 1176 1177mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1178 return down_cast<mirror::ArtField*>(GetClassRoot(kJavaLangReflectArtField)->AllocObject(self)); 1179} 1180 1181mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1182 return down_cast<mirror::ArtMethod*>(GetClassRoot(kJavaLangReflectArtMethod)->AllocObject(self)); 1183} 1184 1185mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray(Thread* self, 1186 size_t length) { 1187 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc(self, 1188 GetClassRoot(kJavaLangStackTraceElementArrayClass), 1189 length); 1190} 1191 1192static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1193 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1194 DCHECK(klass != NULL); 1195 // Wait for the class if it has not already been linked. 1196 if (!klass->IsResolved() && !klass->IsErroneous()) { 1197 ObjectLock lock(self, klass); 1198 // Check for circular dependencies between classes. 1199 if (!klass->IsResolved() && klass->GetClinitThreadId() == self->GetTid()) { 1200 ThrowClassCircularityError(klass); 1201 klass->SetStatus(mirror::Class::kStatusError); 1202 return NULL; 1203 } 1204 // Wait for the pending initialization to complete. 1205 while (!klass->IsResolved() && !klass->IsErroneous()) { 1206 lock.WaitIgnoringInterrupts(); 1207 } 1208 } 1209 if (klass->IsErroneous()) { 1210 ThrowEarlierClassFailure(klass); 1211 return NULL; 1212 } 1213 // Return the loaded class. No exceptions should be pending. 1214 CHECK(klass->IsResolved()) << PrettyClass(klass); 1215 self->AssertNoPendingException(); 1216 return klass; 1217} 1218 1219mirror::Class* ClassLinker::FindSystemClass(const char* descriptor) { 1220 return FindClass(descriptor, NULL); 1221} 1222 1223mirror::Class* ClassLinker::FindClass(const char* descriptor, mirror::ClassLoader* class_loader) { 1224 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1225 Thread* self = Thread::Current(); 1226 DCHECK(self != NULL); 1227 self->AssertNoPendingException(); 1228 if (descriptor[1] == '\0') { 1229 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1230 // for primitive classes that aren't backed by dex files. 1231 return FindPrimitiveClass(descriptor[0]); 1232 } 1233 // Find the class in the loaded classes table. 1234 mirror::Class* klass = LookupClass(descriptor, class_loader); 1235 if (klass != NULL) { 1236 return EnsureResolved(self, klass); 1237 } 1238 // Class is not yet loaded. 1239 if (descriptor[0] == '[') { 1240 return CreateArrayClass(descriptor, class_loader); 1241 1242 } else if (class_loader == NULL) { 1243 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1244 if (pair.second != NULL) { 1245 return DefineClass(descriptor, NULL, *pair.first, *pair.second); 1246 } 1247 1248 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1249 // first try the boot class path 1250 mirror::Class* system_class = FindSystemClass(descriptor); 1251 if (system_class != NULL) { 1252 return system_class; 1253 } 1254 CHECK(self->IsExceptionPending()); 1255 self->ClearException(); 1256 1257 // next try the compile time class path 1258 const std::vector<const DexFile*>* class_path; 1259 { 1260 ScopedObjectAccessUnchecked soa(Thread::Current()); 1261 ScopedLocalRef<jobject> jclass_loader(soa.Env(), soa.AddLocalReference<jobject>(class_loader)); 1262 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1263 } 1264 1265 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1266 if (pair.second != NULL) { 1267 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1268 } 1269 1270 } else { 1271 ScopedObjectAccessUnchecked soa(self->GetJniEnv()); 1272 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1273 soa.AddLocalReference<jobject>(class_loader)); 1274 std::string class_name_string(DescriptorToDot(descriptor)); 1275 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1276 { 1277 ScopedThreadStateChange tsc(self, kNative); 1278 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1279 soa.Env()->NewStringUTF(class_name_string.c_str())); 1280 if (class_name_object.get() == NULL) { 1281 return NULL; 1282 } 1283 CHECK(class_loader_object.get() != NULL); 1284 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1285 WellKnownClasses::java_lang_ClassLoader_loadClass, 1286 class_name_object.get())); 1287 } 1288 if (soa.Self()->IsExceptionPending()) { 1289 // If the ClassLoader threw, pass that exception up. 1290 return NULL; 1291 } else if (result.get() == NULL) { 1292 // broken loader - throw NPE to be compatible with Dalvik 1293 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1294 class_name_string.c_str()).c_str()); 1295 return NULL; 1296 } else { 1297 // success, return mirror::Class* 1298 return soa.Decode<mirror::Class*>(result.get()); 1299 } 1300 } 1301 1302 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1303 return NULL; 1304} 1305 1306mirror::Class* ClassLinker::DefineClass(const StringPiece& descriptor, 1307 mirror::ClassLoader* class_loader, 1308 const DexFile& dex_file, 1309 const DexFile::ClassDef& dex_class_def) { 1310 Thread* self = Thread::Current(); 1311 SirtRef<mirror::Class> klass(self, NULL); 1312 // Load the class from the dex file. 1313 if (!init_done_) { 1314 // finish up init of hand crafted class_roots_ 1315 if (descriptor == "Ljava/lang/Object;") { 1316 klass.reset(GetClassRoot(kJavaLangObject)); 1317 } else if (descriptor == "Ljava/lang/Class;") { 1318 klass.reset(GetClassRoot(kJavaLangClass)); 1319 } else if (descriptor == "Ljava/lang/String;") { 1320 klass.reset(GetClassRoot(kJavaLangString)); 1321 } else if (descriptor == "Ljava/lang/DexCache;") { 1322 klass.reset(GetClassRoot(kJavaLangDexCache)); 1323 } else if (descriptor == "Ljava/lang/reflect/ArtField;") { 1324 klass.reset(GetClassRoot(kJavaLangReflectArtField)); 1325 } else if (descriptor == "Ljava/lang/reflect/ArtMethod;") { 1326 klass.reset(GetClassRoot(kJavaLangReflectArtMethod)); 1327 } else { 1328 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1329 } 1330 } else { 1331 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1332 } 1333 klass->SetDexCache(FindDexCache(dex_file)); 1334 LoadClass(dex_file, dex_class_def, klass, class_loader); 1335 // Check for a pending exception during load 1336 if (self->IsExceptionPending()) { 1337 klass->SetStatus(mirror::Class::kStatusError); 1338 return NULL; 1339 } 1340 ObjectLock lock(self, klass.get()); 1341 klass->SetClinitThreadId(self->GetTid()); 1342 // Add the newly loaded class to the loaded classes table. 1343 SirtRef<mirror::Class> existing(self, InsertClass(descriptor, klass.get(), false)); 1344 if (existing.get() != NULL) { 1345 // We failed to insert because we raced with another thread. 1346 return EnsureResolved(self, existing.get()); 1347 } 1348 // Finish loading (if necessary) by finding parents 1349 CHECK(!klass->IsLoaded()); 1350 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1351 // Loading failed. 1352 klass->SetStatus(mirror::Class::kStatusError); 1353 lock.NotifyAll(); 1354 return NULL; 1355 } 1356 CHECK(klass->IsLoaded()); 1357 // Link the class (if necessary) 1358 CHECK(!klass->IsResolved()); 1359 if (!LinkClass(klass, NULL)) { 1360 // Linking failed. 1361 klass->SetStatus(mirror::Class::kStatusError); 1362 lock.NotifyAll(); 1363 return NULL; 1364 } 1365 CHECK(klass->IsResolved()); 1366 1367 /* 1368 * We send CLASS_PREPARE events to the debugger from here. The 1369 * definition of "preparation" is creating the static fields for a 1370 * class and initializing them to the standard default values, but not 1371 * executing any code (that comes later, during "initialization"). 1372 * 1373 * We did the static preparation in LinkClass. 1374 * 1375 * The class has been prepared and resolved but possibly not yet verified 1376 * at this point. 1377 */ 1378 Dbg::PostClassPrepare(klass.get()); 1379 1380 return klass.get(); 1381} 1382 1383// Precomputes size that will be needed for Class, matching LinkStaticFields 1384size_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1385 const DexFile::ClassDef& dex_class_def) { 1386 const byte* class_data = dex_file.GetClassData(dex_class_def); 1387 size_t num_ref = 0; 1388 size_t num_32 = 0; 1389 size_t num_64 = 0; 1390 if (class_data != NULL) { 1391 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1392 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1393 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1394 char c = descriptor[0]; 1395 if (c == 'L' || c == '[') { 1396 num_ref++; 1397 } else if (c == 'J' || c == 'D') { 1398 num_64++; 1399 } else { 1400 num_32++; 1401 } 1402 } 1403 } 1404 // start with generic class data 1405 size_t size = sizeof(mirror::Class); 1406 // follow with reference fields which must be contiguous at start 1407 size += (num_ref * sizeof(uint32_t)); 1408 // if there are 64-bit fields to add, make sure they are aligned 1409 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1410 if (num_32 != 0) { 1411 // use an available 32-bit field for padding 1412 num_32--; 1413 } 1414 size += sizeof(uint32_t); // either way, we are adding a word 1415 DCHECK_EQ(size, RoundUp(size, 8)); 1416 } 1417 // tack on any 64-bit fields now that alignment is assured 1418 size += (num_64 * sizeof(uint64_t)); 1419 // tack on any remaining 32-bit fields 1420 size += (num_32 * sizeof(uint32_t)); 1421 return size; 1422} 1423 1424const OatFile::OatClass* ClassLinker::GetOatClass(const DexFile& dex_file, const char* descriptor) { 1425 DCHECK(descriptor != NULL); 1426 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1427 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << descriptor; 1428 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation()); 1429 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << descriptor; 1430 uint32_t class_def_index; 1431 bool found = dex_file.FindClassDefIndex(descriptor, class_def_index); 1432 CHECK(found) << dex_file.GetLocation() << " " << descriptor; 1433 const OatFile::OatClass* oat_class = oat_dex_file->GetOatClass(class_def_index); 1434 CHECK(oat_class != NULL) << dex_file.GetLocation() << " " << descriptor; 1435 return oat_class; 1436} 1437 1438static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint32_t method_idx) { 1439 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 1440 const DexFile::TypeId& type_id = dex_file.GetTypeId(method_id.class_idx_); 1441 const DexFile::ClassDef* class_def = dex_file.FindClassDef(dex_file.GetTypeDescriptor(type_id)); 1442 CHECK(class_def != NULL); 1443 const byte* class_data = dex_file.GetClassData(*class_def); 1444 CHECK(class_data != NULL); 1445 ClassDataItemIterator it(dex_file, class_data); 1446 // Skip fields 1447 while (it.HasNextStaticField()) { 1448 it.Next(); 1449 } 1450 while (it.HasNextInstanceField()) { 1451 it.Next(); 1452 } 1453 // Process methods 1454 size_t class_def_method_index = 0; 1455 while (it.HasNextDirectMethod()) { 1456 if (it.GetMemberIndex() == method_idx) { 1457 return class_def_method_index; 1458 } 1459 class_def_method_index++; 1460 it.Next(); 1461 } 1462 while (it.HasNextVirtualMethod()) { 1463 if (it.GetMemberIndex() == method_idx) { 1464 return class_def_method_index; 1465 } 1466 class_def_method_index++; 1467 it.Next(); 1468 } 1469 DCHECK(!it.HasNext()); 1470 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1471 return 0; 1472} 1473 1474const OatFile::OatMethod ClassLinker::GetOatMethodFor(const mirror::ArtMethod* method) { 1475 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1476 // method for direct methods (or virtual methods made direct). 1477 mirror::Class* declaring_class = method->GetDeclaringClass(); 1478 size_t oat_method_index; 1479 if (method->IsStatic() || method->IsDirect()) { 1480 // Simple case where the oat method index was stashed at load time. 1481 oat_method_index = method->GetMethodIndex(); 1482 } else { 1483 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1484 // by search for its position in the declared virtual methods. 1485 oat_method_index = declaring_class->NumDirectMethods(); 1486 size_t end = declaring_class->NumVirtualMethods(); 1487 bool found = false; 1488 for (size_t i = 0; i < end; i++) { 1489 if (declaring_class->GetVirtualMethod(i) == method) { 1490 found = true; 1491 break; 1492 } 1493 oat_method_index++; 1494 } 1495 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1496 } 1497 ClassHelper kh(declaring_class); 1498 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(kh.GetDexFile(), kh.GetDescriptor())); 1499 CHECK(oat_class.get() != NULL); 1500 DCHECK_EQ(oat_method_index, 1501 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1502 method->GetDexMethodIndex())); 1503 1504 return oat_class->GetOatMethod(oat_method_index); 1505} 1506 1507// Special case to get oat code without overwriting a trampoline. 1508const void* ClassLinker::GetOatCodeFor(const mirror::ArtMethod* method) { 1509 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1510 if (method->IsProxyMethod()) { 1511#if !defined(ART_USE_PORTABLE_COMPILER) 1512 return reinterpret_cast<void*>(art_quick_proxy_invoke_handler); 1513#else 1514 return reinterpret_cast<void*>(art_portable_proxy_invoke_handler); 1515#endif 1516 } 1517 const void* result = GetOatMethodFor(method).GetCode(); 1518 if (result == NULL) { 1519 // No code? You must mean to go into the interpreter. 1520 result = GetCompiledCodeToInterpreterBridge(); 1521 } 1522 return result; 1523} 1524 1525const void* ClassLinker::GetOatCodeFor(const DexFile& dex_file, uint32_t method_idx) { 1526 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 1527 const char* descriptor = dex_file.GetTypeDescriptor(dex_file.GetTypeId(method_id.class_idx_)); 1528 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, method_idx); 1529 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, descriptor)); 1530 CHECK(oat_class.get() != NULL); 1531 return oat_class->GetOatMethod(oat_method_idx).GetCode(); 1532} 1533 1534// Returns true if the method must run with interpreter, false otherwise. 1535static bool NeedsInterpreter(const mirror::ArtMethod* method, const void* code) { 1536 if (code == NULL) { 1537 // No code: need interpreter. 1538 return true; 1539 } 1540 // If interpreter mode is enabled, every method (except native and proxy) must 1541 // be run with interpreter. 1542 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1543 !method->IsNative() && !method->IsProxyMethod(); 1544} 1545 1546void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1547 ClassHelper kh(klass); 1548 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 1549 CHECK(dex_class_def != NULL); 1550 const DexFile& dex_file = kh.GetDexFile(); 1551 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1552 if (class_data == NULL) { 1553 return; // no fields or methods - for example a marker interface 1554 } 1555 Runtime* runtime = Runtime::Current(); 1556 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1557 // OAT file unavailable 1558 return; 1559 } 1560 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, kh.GetDescriptor())); 1561 CHECK(oat_class.get() != NULL); 1562 ClassDataItemIterator it(dex_file, class_data); 1563 // Skip fields 1564 while (it.HasNextStaticField()) { 1565 it.Next(); 1566 } 1567 while (it.HasNextInstanceField()) { 1568 it.Next(); 1569 } 1570 // Link the code of methods skipped by LinkCode 1571 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1572 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1573 if (!method->IsStatic()) { 1574 // Only update static methods. 1575 continue; 1576 } 1577 const void* code = oat_class->GetOatMethod(method_index).GetCode(); 1578 const bool enter_interpreter = NeedsInterpreter(method, code); 1579 if (enter_interpreter) { 1580 // Use interpreter entry point. 1581 code = GetCompiledCodeToInterpreterBridge(); 1582 } 1583 runtime->GetInstrumentation()->UpdateMethodsCode(method, code); 1584 } 1585 // Ignore virtual methods on the iterator. 1586} 1587 1588static void LinkCode(SirtRef<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class, 1589 uint32_t method_index) 1590 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1591 // Method shouldn't have already been linked. 1592 DCHECK(method->GetEntryPointFromCompiledCode() == NULL); 1593 // Every kind of method should at least get an invoke stub from the oat_method. 1594 // non-abstract methods also get their code pointers. 1595 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1596 oat_method.LinkMethod(method.get()); 1597 1598 // Install entry point from interpreter. 1599 Runtime* runtime = Runtime::Current(); 1600 bool enter_interpreter = NeedsInterpreter(method.get(), method->GetEntryPointFromCompiledCode()); 1601 if (enter_interpreter) { 1602 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1603 } else { 1604 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1605 } 1606 1607 if (method->IsAbstract()) { 1608 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1609 return; 1610 } 1611 1612 if (method->IsStatic() && !method->IsConstructor()) { 1613 // For static methods excluding the class initializer, install the trampoline. 1614 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1615 // after initializing class (see ClassLinker::InitializeClass method). 1616 method->SetEntryPointFromCompiledCode(GetResolutionTrampoline(runtime->GetClassLinker())); 1617 } else if (enter_interpreter) { 1618 // Set entry point from compiled code if there's no code or in interpreter only mode. 1619 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1620 } 1621 1622 if (method->IsNative()) { 1623 // Unregistering restores the dlsym lookup stub. 1624 method->UnregisterNative(Thread::Current()); 1625 } 1626 1627 // Allow instrumentation its chance to hijack code. 1628 runtime->GetInstrumentation()->UpdateMethodsCode(method.get(), 1629 method->GetEntryPointFromCompiledCode()); 1630} 1631 1632void ClassLinker::LoadClass(const DexFile& dex_file, 1633 const DexFile::ClassDef& dex_class_def, 1634 SirtRef<mirror::Class>& klass, 1635 mirror::ClassLoader* class_loader) { 1636 CHECK(klass.get() != NULL); 1637 CHECK(klass->GetDexCache() != NULL); 1638 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1639 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1640 CHECK(descriptor != NULL); 1641 1642 klass->SetClass(GetClassRoot(kJavaLangClass)); 1643 uint32_t access_flags = dex_class_def.access_flags_; 1644 // Make sure that none of our runtime-only flags are set. 1645 // TODO: JACK CLASS ACCESS (HACK TO BE REMOVED) 1646 CHECK_EQ(access_flags & ~(kAccJavaFlagsMask | kAccClassJack), 0U); 1647 klass->SetAccessFlags(access_flags); 1648 klass->SetClassLoader(class_loader); 1649 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1650 klass->SetStatus(mirror::Class::kStatusIdx); 1651 1652 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1653 1654 // Load fields fields. 1655 const byte* class_data = dex_file.GetClassData(dex_class_def); 1656 if (class_data == NULL) { 1657 return; // no fields or methods - for example a marker interface 1658 } 1659 ClassDataItemIterator it(dex_file, class_data); 1660 Thread* self = Thread::Current(); 1661 if (it.NumStaticFields() != 0) { 1662 klass->SetSFields(AllocArtFieldArray(self, it.NumStaticFields())); 1663 } 1664 if (it.NumInstanceFields() != 0) { 1665 klass->SetIFields(AllocArtFieldArray(self, it.NumInstanceFields())); 1666 } 1667 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1668 SirtRef<mirror::ArtField> sfield(self, AllocArtField(self)); 1669 klass->SetStaticField(i, sfield.get()); 1670 LoadField(dex_file, it, klass, sfield); 1671 } 1672 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1673 SirtRef<mirror::ArtField> ifield(self, AllocArtField(self)); 1674 klass->SetInstanceField(i, ifield.get()); 1675 LoadField(dex_file, it, klass, ifield); 1676 } 1677 1678 UniquePtr<const OatFile::OatClass> oat_class; 1679 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1680 oat_class.reset(GetOatClass(dex_file, descriptor)); 1681 } 1682 1683 // Load methods. 1684 if (it.NumDirectMethods() != 0) { 1685 // TODO: append direct methods to class object 1686 klass->SetDirectMethods(AllocArtMethodArray(self, it.NumDirectMethods())); 1687 } 1688 if (it.NumVirtualMethods() != 0) { 1689 // TODO: append direct methods to class object 1690 klass->SetVirtualMethods(AllocArtMethodArray(self, it.NumVirtualMethods())); 1691 } 1692 size_t class_def_method_index = 0; 1693 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1694 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1695 klass->SetDirectMethod(i, method.get()); 1696 if (oat_class.get() != NULL) { 1697 LinkCode(method, oat_class.get(), class_def_method_index); 1698 } 1699 method->SetMethodIndex(class_def_method_index); 1700 class_def_method_index++; 1701 } 1702 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1703 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1704 klass->SetVirtualMethod(i, method.get()); 1705 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1706 if (oat_class.get() != NULL) { 1707 LinkCode(method, oat_class.get(), class_def_method_index); 1708 } 1709 class_def_method_index++; 1710 } 1711 DCHECK(!it.HasNext()); 1712} 1713 1714void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1715 SirtRef<mirror::Class>& klass, SirtRef<mirror::ArtField>& dst) { 1716 uint32_t field_idx = it.GetMemberIndex(); 1717 dst->SetDexFieldIndex(field_idx); 1718 dst->SetDeclaringClass(klass.get()); 1719 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1720} 1721 1722mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1723 const ClassDataItemIterator& it, 1724 SirtRef<mirror::Class>& klass) { 1725 uint32_t dex_method_idx = it.GetMemberIndex(); 1726 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1727 StringPiece method_name(dex_file.GetMethodName(method_id)); 1728 1729 mirror::ArtMethod* dst = AllocArtMethod(self); 1730 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 1731 1732 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 1733 dst->SetDexMethodIndex(dex_method_idx); 1734 dst->SetDeclaringClass(klass.get()); 1735 1736 if (method_name == "finalize") { 1737 // Create the prototype for a signature of "()V" 1738 const DexFile::StringId* void_string_id = dex_file.FindStringId("V"); 1739 if (void_string_id != NULL) { 1740 const DexFile::TypeId* void_type_id = 1741 dex_file.FindTypeId(dex_file.GetIndexForStringId(*void_string_id)); 1742 if (void_type_id != NULL) { 1743 std::vector<uint16_t> no_args; 1744 const DexFile::ProtoId* finalizer_proto = 1745 dex_file.FindProtoId(dex_file.GetIndexForTypeId(*void_type_id), no_args); 1746 if (finalizer_proto != NULL) { 1747 // We have the prototype in the dex file 1748 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 1749 klass->SetFinalizable(); 1750 } else { 1751 StringPiece klass_descriptor(dex_file.StringByTypeIdx(klass->GetDexTypeIndex())); 1752 // The Enum class declares a "final" finalize() method to prevent subclasses from 1753 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 1754 // subclasses, so we exclude it here. 1755 // We also want to avoid setting the flag on Object, where we know that finalize() is 1756 // empty. 1757 if (klass_descriptor != "Ljava/lang/Object;" && 1758 klass_descriptor != "Ljava/lang/Enum;") { 1759 klass->SetFinalizable(); 1760 } 1761 } 1762 } 1763 } 1764 } 1765 } 1766 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 1767 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1768 1769 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 1770 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 1771 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 1772 dst->SetDexCacheInitializedStaticStorage(klass->GetDexCache()->GetInitializedStaticStorage()); 1773 1774 CHECK(dst->IsArtMethod()); 1775 1776 self->EndAssertNoThreadSuspension(old_cause); 1777 return dst; 1778} 1779 1780void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 1781 Thread* self = Thread::Current(); 1782 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1783 AppendToBootClassPath(dex_file, dex_cache); 1784} 1785 1786void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1787 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1788 boot_class_path_.push_back(&dex_file); 1789 RegisterDexFile(dex_file, dex_cache); 1790} 1791 1792bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 1793 dex_lock_.AssertSharedHeld(Thread::Current()); 1794 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1795 if (dex_caches_[i]->GetDexFile() == &dex_file) { 1796 return true; 1797 } 1798 } 1799 return false; 1800} 1801 1802bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 1803 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1804 return IsDexFileRegisteredLocked(dex_file); 1805} 1806 1807void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1808 dex_lock_.AssertExclusiveHeld(Thread::Current()); 1809 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1810 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())); 1811 dex_caches_.push_back(dex_cache.get()); 1812 dex_cache->SetDexFile(&dex_file); 1813 Dirty(); 1814} 1815 1816void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 1817 Thread* self = Thread::Current(); 1818 { 1819 ReaderMutexLock mu(self, dex_lock_); 1820 if (IsDexFileRegisteredLocked(dex_file)) { 1821 return; 1822 } 1823 } 1824 // Don't alloc while holding the lock, since allocation may need to 1825 // suspend all threads and another thread may need the dex_lock_ to 1826 // get to a suspend point. 1827 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1828 { 1829 WriterMutexLock mu(self, dex_lock_); 1830 if (IsDexFileRegisteredLocked(dex_file)) { 1831 return; 1832 } 1833 RegisterDexFileLocked(dex_file, dex_cache); 1834 } 1835} 1836 1837void ClassLinker::RegisterDexFile(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1838 WriterMutexLock mu(Thread::Current(), dex_lock_); 1839 RegisterDexFileLocked(dex_file, dex_cache); 1840} 1841 1842mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 1843 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1844 // Search assuming unique-ness of dex file. 1845 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1846 mirror::DexCache* dex_cache = dex_caches_[i]; 1847 if (dex_cache->GetDexFile() == &dex_file) { 1848 return dex_cache; 1849 } 1850 } 1851 // Search matching by location name. 1852 std::string location(dex_file.GetLocation()); 1853 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1854 mirror::DexCache* dex_cache = dex_caches_[i]; 1855 if (dex_cache->GetDexFile()->GetLocation() == location) { 1856 return dex_cache; 1857 } 1858 } 1859 // Failure, dump diagnostic and abort. 1860 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1861 mirror::DexCache* dex_cache = dex_caches_[i]; 1862 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 1863 } 1864 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 1865 return NULL; 1866} 1867 1868void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 1869 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1870 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1871 dex_caches_[i]->Fixup(resolution_method); 1872 } 1873} 1874 1875mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 1876 return InitializePrimitiveClass(AllocClass(self, sizeof(mirror::Class)), type); 1877} 1878 1879mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, Primitive::Type type) { 1880 CHECK(primitive_class != NULL); 1881 // Must hold lock on object when initializing. 1882 ObjectLock lock(Thread::Current(), primitive_class); 1883 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 1884 primitive_class->SetPrimitiveType(type); 1885 primitive_class->SetStatus(mirror::Class::kStatusInitialized); 1886 mirror::Class* existing = InsertClass(Primitive::Descriptor(type), primitive_class, false); 1887 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 1888 return primitive_class; 1889} 1890 1891// Create an array class (i.e. the class object for the array, not the 1892// array itself). "descriptor" looks like "[C" or "[[[[B" or 1893// "[Ljava/lang/String;". 1894// 1895// If "descriptor" refers to an array of primitives, look up the 1896// primitive type's internally-generated class object. 1897// 1898// "class_loader" is the class loader of the class that's referring to 1899// us. It's used to ensure that we're looking for the element type in 1900// the right context. It does NOT become the class loader for the 1901// array class; that always comes from the base element class. 1902// 1903// Returns NULL with an exception raised on failure. 1904mirror::Class* ClassLinker::CreateArrayClass(const std::string& descriptor, 1905 mirror::ClassLoader* class_loader) { 1906 CHECK_EQ('[', descriptor[0]); 1907 1908 // Identify the underlying component type 1909 mirror::Class* component_type = FindClass(descriptor.substr(1).c_str(), class_loader); 1910 if (component_type == NULL) { 1911 DCHECK(Thread::Current()->IsExceptionPending()); 1912 return NULL; 1913 } 1914 1915 // See if the component type is already loaded. Array classes are 1916 // always associated with the class loader of their underlying 1917 // element type -- an array of Strings goes with the loader for 1918 // java/lang/String -- so we need to look for it there. (The 1919 // caller should have checked for the existence of the class 1920 // before calling here, but they did so with *their* class loader, 1921 // not the component type's loader.) 1922 // 1923 // If we find it, the caller adds "loader" to the class' initiating 1924 // loader list, which should prevent us from going through this again. 1925 // 1926 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 1927 // are the same, because our caller (FindClass) just did the 1928 // lookup. (Even if we get this wrong we still have correct behavior, 1929 // because we effectively do this lookup again when we add the new 1930 // class to the hash table --- necessary because of possible races with 1931 // other threads.) 1932 if (class_loader != component_type->GetClassLoader()) { 1933 mirror::Class* new_class = LookupClass(descriptor.c_str(), component_type->GetClassLoader()); 1934 if (new_class != NULL) { 1935 return new_class; 1936 } 1937 } 1938 1939 // Fill out the fields in the Class. 1940 // 1941 // It is possible to execute some methods against arrays, because 1942 // all arrays are subclasses of java_lang_Object_, so we need to set 1943 // up a vtable. We can just point at the one in java_lang_Object_. 1944 // 1945 // Array classes are simple enough that we don't need to do a full 1946 // link step. 1947 Thread* self = Thread::Current(); 1948 SirtRef<mirror::Class> new_class(self, NULL); 1949 if (!init_done_) { 1950 // Classes that were hand created, ie not by FindSystemClass 1951 if (descriptor == "[Ljava/lang/Class;") { 1952 new_class.reset(GetClassRoot(kClassArrayClass)); 1953 } else if (descriptor == "[Ljava/lang/Object;") { 1954 new_class.reset(GetClassRoot(kObjectArrayClass)); 1955 } else if (descriptor == class_roots_descriptors_[kJavaLangStringArrayClass]) { 1956 new_class.reset(GetClassRoot(kJavaLangStringArrayClass)); 1957 } else if (descriptor == class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) { 1958 new_class.reset(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 1959 } else if (descriptor == class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) { 1960 new_class.reset(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 1961 } else if (descriptor == "[C") { 1962 new_class.reset(GetClassRoot(kCharArrayClass)); 1963 } else if (descriptor == "[I") { 1964 new_class.reset(GetClassRoot(kIntArrayClass)); 1965 } 1966 } 1967 if (new_class.get() == NULL) { 1968 new_class.reset(AllocClass(self, sizeof(mirror::Class))); 1969 if (new_class.get() == NULL) { 1970 return NULL; 1971 } 1972 new_class->SetComponentType(component_type); 1973 } 1974 ObjectLock lock(self, new_class.get()); // Must hold lock on object when initializing. 1975 DCHECK(new_class->GetComponentType() != NULL); 1976 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 1977 new_class->SetSuperClass(java_lang_Object); 1978 new_class->SetVTable(java_lang_Object->GetVTable()); 1979 new_class->SetPrimitiveType(Primitive::kPrimNot); 1980 new_class->SetClassLoader(component_type->GetClassLoader()); 1981 new_class->SetStatus(mirror::Class::kStatusInitialized); 1982 // don't need to set new_class->SetObjectSize(..) 1983 // because Object::SizeOf delegates to Array::SizeOf 1984 1985 1986 // All arrays have java/lang/Cloneable and java/io/Serializable as 1987 // interfaces. We need to set that up here, so that stuff like 1988 // "instanceof" works right. 1989 // 1990 // Note: The GC could run during the call to FindSystemClass, 1991 // so we need to make sure the class object is GC-valid while we're in 1992 // there. Do this by clearing the interface list so the GC will just 1993 // think that the entries are null. 1994 1995 1996 // Use the single, global copies of "interfaces" and "iftable" 1997 // (remember not to free them for arrays). 1998 CHECK(array_iftable_ != NULL); 1999 new_class->SetIfTable(array_iftable_); 2000 2001 // Inherit access flags from the component type. 2002 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2003 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2004 access_flags &= kAccJavaFlagsMask; 2005 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2006 // and remove "interface". 2007 access_flags |= kAccAbstract | kAccFinal; 2008 access_flags &= ~kAccInterface; 2009 2010 new_class->SetAccessFlags(access_flags); 2011 2012 mirror::Class* existing = InsertClass(descriptor, new_class.get(), false); 2013 if (existing == NULL) { 2014 return new_class.get(); 2015 } 2016 // Another thread must have loaded the class after we 2017 // started but before we finished. Abandon what we've 2018 // done. 2019 // 2020 // (Yes, this happens.) 2021 2022 return existing; 2023} 2024 2025mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2026 switch (Primitive::GetType(type)) { 2027 case Primitive::kPrimByte: 2028 return GetClassRoot(kPrimitiveByte); 2029 case Primitive::kPrimChar: 2030 return GetClassRoot(kPrimitiveChar); 2031 case Primitive::kPrimDouble: 2032 return GetClassRoot(kPrimitiveDouble); 2033 case Primitive::kPrimFloat: 2034 return GetClassRoot(kPrimitiveFloat); 2035 case Primitive::kPrimInt: 2036 return GetClassRoot(kPrimitiveInt); 2037 case Primitive::kPrimLong: 2038 return GetClassRoot(kPrimitiveLong); 2039 case Primitive::kPrimShort: 2040 return GetClassRoot(kPrimitiveShort); 2041 case Primitive::kPrimBoolean: 2042 return GetClassRoot(kPrimitiveBoolean); 2043 case Primitive::kPrimVoid: 2044 return GetClassRoot(kPrimitiveVoid); 2045 case Primitive::kPrimNot: 2046 break; 2047 } 2048 std::string printable_type(PrintableChar(type)); 2049 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2050 return NULL; 2051} 2052 2053mirror::Class* ClassLinker::InsertClass(const StringPiece& descriptor, mirror::Class* klass, 2054 bool image_class) { 2055 if (VLOG_IS_ON(class_linker)) { 2056 mirror::DexCache* dex_cache = klass->GetDexCache(); 2057 std::string source; 2058 if (dex_cache != NULL) { 2059 source += " from "; 2060 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2061 } 2062 LOG(INFO) << "Loaded class " << descriptor << source; 2063 } 2064 size_t hash = StringPieceHash()(descriptor); 2065 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2066 Table& classes = image_class ? image_classes_ : classes_; 2067 mirror::Class* existing = 2068 LookupClassLocked(descriptor.data(), klass->GetClassLoader(), hash, classes); 2069#ifndef NDEBUG 2070 // Check we don't have the class in the other table in error 2071 Table& other_classes = image_class ? classes_ : image_classes_; 2072 CHECK(LookupClassLocked(descriptor.data(), klass->GetClassLoader(), hash, other_classes) == NULL); 2073#endif 2074 if (existing != NULL) { 2075 return existing; 2076 } 2077 Runtime::Current()->GetHeap()->VerifyObject(klass); 2078 classes.insert(std::make_pair(hash, klass)); 2079 Dirty(); 2080 return NULL; 2081} 2082 2083bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2084 size_t hash = Hash(descriptor); 2085 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2086 typedef Table::iterator It; // TODO: C++0x auto 2087 // TODO: determine if its better to search classes_ or image_classes_ first 2088 ClassHelper kh; 2089 for (It it = classes_.lower_bound(hash), end = classes_.end(); it != end && it->first == hash; 2090 ++it) { 2091 mirror::Class* klass = it->second; 2092 kh.ChangeClass(klass); 2093 if (strcmp(kh.GetDescriptor(), descriptor) == 0 && klass->GetClassLoader() == class_loader) { 2094 classes_.erase(it); 2095 return true; 2096 } 2097 } 2098 for (It it = image_classes_.lower_bound(hash), end = classes_.end(); 2099 it != end && it->first == hash; ++it) { 2100 mirror::Class* klass = it->second; 2101 kh.ChangeClass(klass); 2102 if (strcmp(kh.GetDescriptor(), descriptor) == 0 && klass->GetClassLoader() == class_loader) { 2103 image_classes_.erase(it); 2104 return true; 2105 } 2106 } 2107 return false; 2108} 2109 2110mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2111 const mirror::ClassLoader* class_loader) { 2112 size_t hash = Hash(descriptor); 2113 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2114 // TODO: determine if its better to search classes_ or image_classes_ first 2115 mirror::Class* klass = NULL; 2116 // Use image class only if the class_loader is null. 2117 if (class_loader == NULL) { 2118 klass = LookupClassLocked(descriptor, class_loader, hash, image_classes_); 2119 } 2120 if (klass != NULL) { 2121 return klass; 2122 } 2123 return LookupClassLocked(descriptor, class_loader, hash, classes_); 2124} 2125 2126mirror::Class* ClassLinker::LookupClassLocked(const char* descriptor, 2127 const mirror::ClassLoader* class_loader, 2128 size_t hash, const Table& classes) { 2129 ClassHelper kh(NULL, this); 2130 typedef Table::const_iterator It; // TODO: C++0x auto 2131 for (It it = classes.lower_bound(hash), end = classes_.end(); it != end && it->first == hash; ++it) { 2132 mirror::Class* klass = it->second; 2133 kh.ChangeClass(klass); 2134 if (strcmp(descriptor, kh.GetDescriptor()) == 0 && klass->GetClassLoader() == class_loader) { 2135#ifndef NDEBUG 2136 for (++it; it != end && it->first == hash; ++it) { 2137 mirror::Class* klass2 = it->second; 2138 kh.ChangeClass(klass2); 2139 CHECK(!(strcmp(descriptor, kh.GetDescriptor()) == 0 && klass2->GetClassLoader() == class_loader)) 2140 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2141 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2142 } 2143#endif 2144 return klass; 2145 } 2146 } 2147 return NULL; 2148} 2149 2150void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& classes) { 2151 classes.clear(); 2152 size_t hash = Hash(descriptor); 2153 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2154 typedef Table::const_iterator It; // TODO: C++0x auto 2155 // TODO: determine if its better to search classes_ or image_classes_ first 2156 ClassHelper kh(NULL, this); 2157 for (It it = classes_.lower_bound(hash), end = classes_.end(); it != end && it->first == hash; ++it) { 2158 mirror::Class* klass = it->second; 2159 kh.ChangeClass(klass); 2160 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2161 classes.push_back(klass); 2162 } 2163 } 2164 for (It it = image_classes_.lower_bound(hash), end = classes_.end(); it != end && it->first == hash; ++it) { 2165 mirror::Class* klass = it->second; 2166 kh.ChangeClass(klass); 2167 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2168 classes.push_back(klass); 2169 } 2170 } 2171} 2172 2173void ClassLinker::VerifyClass(mirror::Class* klass) { 2174 // TODO: assert that the monitor on the Class is held 2175 Thread* self = Thread::Current(); 2176 ObjectLock lock(self, klass); 2177 2178 // Don't attempt to re-verify if already sufficiently verified. 2179 if (klass->IsVerified() || 2180 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2181 return; 2182 } 2183 2184 // The class might already be erroneous, for example at compile time if we attempted to verify 2185 // this class as a parent to another. 2186 if (klass->IsErroneous()) { 2187 ThrowEarlierClassFailure(klass); 2188 return; 2189 } 2190 2191 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2192 klass->SetStatus(mirror::Class::kStatusVerifying); 2193 } else { 2194 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2195 << PrettyClass(klass); 2196 CHECK(!Runtime::Current()->IsCompiler()); 2197 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime); 2198 } 2199 2200 // Verify super class. 2201 mirror::Class* super = klass->GetSuperClass(); 2202 if (super != NULL) { 2203 // Acquire lock to prevent races on verifying the super class. 2204 ObjectLock lock(self, super); 2205 2206 if (!super->IsVerified() && !super->IsErroneous()) { 2207 Runtime::Current()->GetClassLinker()->VerifyClass(super); 2208 } 2209 if (!super->IsCompileTimeVerified()) { 2210 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2211 PrettyDescriptor(klass).c_str(), 2212 PrettyDescriptor(super).c_str())); 2213 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2214 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 2215 if (cause.get() != NULL) { 2216 self->ClearException(); 2217 } 2218 ThrowVerifyError(klass, "%s", error_msg.c_str()); 2219 if (cause.get() != NULL) { 2220 self->GetException(NULL)->SetCause(cause.get()); 2221 } 2222 klass->SetStatus(mirror::Class::kStatusError); 2223 return; 2224 } 2225 } 2226 2227 // Try to use verification information from the oat file, otherwise do runtime verification. 2228 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2229 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2230 bool preverified = VerifyClassUsingOatFile(dex_file, klass, oat_file_class_status); 2231 if (oat_file_class_status == mirror::Class::kStatusError) { 2232 LOG(WARNING) << "Skipping runtime verification of erroneous class " << PrettyDescriptor(klass) 2233 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2234 ThrowVerifyError(klass, "Rejecting class %s because it failed compile-time verification", 2235 PrettyDescriptor(klass).c_str()); 2236 klass->SetStatus(mirror::Class::kStatusError); 2237 return; 2238 } 2239 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2240 std::string error_msg; 2241 if (!preverified) { 2242 verifier_failure = verifier::MethodVerifier::VerifyClass(klass, error_msg, 2243 Runtime::Current()->IsCompiler()); 2244 } 2245 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2246 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2247 LOG(WARNING) << "Soft verification failure in class " << PrettyDescriptor(klass) 2248 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2249 << " because: " << error_msg; 2250 } 2251 self->AssertNoPendingException(); 2252 // Make sure all classes referenced by catch blocks are resolved. 2253 ResolveClassExceptionHandlerTypes(dex_file, klass); 2254 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2255 klass->SetStatus(mirror::Class::kStatusVerified); 2256 } else { 2257 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2258 // Soft failures at compile time should be retried at runtime. Soft 2259 // failures at runtime will be handled by slow paths in the generated 2260 // code. Set status accordingly. 2261 if (Runtime::Current()->IsCompiler()) { 2262 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime); 2263 } else { 2264 klass->SetStatus(mirror::Class::kStatusVerified); 2265 } 2266 } 2267 } else { 2268 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass) 2269 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2270 << " because: " << error_msg; 2271 self->AssertNoPendingException(); 2272 ThrowVerifyError(klass, "%s", error_msg.c_str()); 2273 klass->SetStatus(mirror::Class::kStatusError); 2274 } 2275 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2276 // Class is verified so we don't need to do any access check in its methods. 2277 // Let the interpreter know it by setting the kAccPreverified flag onto each 2278 // method. 2279 // Note: we're going here during compilation and at runtime. When we set the 2280 // kAccPreverified flag when compiling image classes, the flag is recorded 2281 // in the image and is set when loading the image. 2282 klass->SetPreverifiedFlagOnAllMethods(); 2283 } 2284} 2285 2286bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2287 mirror::Class::Status& oat_file_class_status) { 2288 // If we're compiling, we can only verify the class using the oat file if 2289 // we are not compiling the image or if the class we're verifying is not part of 2290 // the app. In other words, we will only check for preverification of bootclasspath 2291 // classes. 2292 if (Runtime::Current()->IsCompiler()) { 2293 // Are we compiling the bootclasspath? 2294 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2295 return false; 2296 } 2297 // We are compiling an app (not the image). 2298 2299 // Is this an app class? (I.e. not a bootclasspath class) 2300 if (klass->GetClassLoader() != NULL) { 2301 return false; 2302 } 2303 } 2304 2305 2306 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2307 // Make this work with gtests, which do not set up the image properly. 2308 // TODO: we should clean up gtests to set up the image path properly. 2309 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2310 return false; 2311 } 2312 2313 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2314 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation()); 2315 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2316 const char* descriptor = ClassHelper(klass).GetDescriptor(); 2317 uint32_t class_def_index; 2318 bool found = dex_file.FindClassDefIndex(descriptor, class_def_index); 2319 CHECK(found) << dex_file.GetLocation() << " " << PrettyClass(klass) << " " << descriptor; 2320 UniquePtr<const OatFile::OatClass> oat_class(oat_dex_file->GetOatClass(class_def_index)); 2321 CHECK(oat_class.get() != NULL) 2322 << dex_file.GetLocation() << " " << PrettyClass(klass) << " " << descriptor; 2323 oat_file_class_status = oat_class->GetStatus(); 2324 if (oat_file_class_status == mirror::Class::kStatusVerified || 2325 oat_file_class_status == mirror::Class::kStatusInitialized) { 2326 return true; 2327 } 2328 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2329 // Compile time verification failed with a soft error. Compile time verification can fail 2330 // because we have incomplete type information. Consider the following: 2331 // class ... { 2332 // Foo x; 2333 // .... () { 2334 // if (...) { 2335 // v1 gets assigned a type of resolved class Foo 2336 // } else { 2337 // v1 gets assigned a type of unresolved class Bar 2338 // } 2339 // iput x = v1 2340 // } } 2341 // when we merge v1 following the if-the-else it results in Conflict 2342 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2343 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2344 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2345 // at compile time). 2346 return false; 2347 } 2348 if (oat_file_class_status == mirror::Class::kStatusError) { 2349 // Compile time verification failed with a hard error. This is caused by invalid instructions 2350 // in the class. These errors are unrecoverable. 2351 return false; 2352 } 2353 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2354 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2355 // not loading the class. 2356 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2357 // isn't a problem and this case shouldn't occur 2358 return false; 2359 } 2360 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2361 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " << descriptor; 2362 2363 return false; 2364} 2365 2366void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, mirror::Class* klass) { 2367 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2368 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2369 } 2370 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2371 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2372 } 2373} 2374 2375void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2376 mirror::ArtMethod* method) { 2377 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2378 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2379 if (code_item == NULL) { 2380 return; // native or abstract method 2381 } 2382 if (code_item->tries_size_ == 0) { 2383 return; // nothing to process 2384 } 2385 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2386 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2387 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2388 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2389 CatchHandlerIterator iterator(handlers_ptr); 2390 for (; iterator.HasNext(); iterator.Next()) { 2391 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2392 // unresolved exception types will be ignored by exception delivery 2393 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2394 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2395 if (exception_type == NULL) { 2396 DCHECK(Thread::Current()->IsExceptionPending()); 2397 Thread::Current()->ClearException(); 2398 } 2399 } 2400 } 2401 handlers_ptr = iterator.EndDataPointer(); 2402 } 2403} 2404 2405static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2406static void CheckProxyMethod(mirror::ArtMethod* method, 2407 SirtRef<mirror::ArtMethod>& prototype); 2408 2409mirror::Class* ClassLinker::CreateProxyClass(mirror::String* name, 2410 mirror::ObjectArray<mirror::Class>* interfaces, 2411 mirror::ClassLoader* loader, 2412 mirror::ObjectArray<mirror::ArtMethod>* methods, 2413 mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >* throws) { 2414 Thread* self = Thread::Current(); 2415 SirtRef<mirror::Class> klass(self, AllocClass(self, GetClassRoot(kJavaLangClass), 2416 sizeof(mirror::SynthesizedProxyClass))); 2417 CHECK(klass.get() != NULL); 2418 DCHECK(klass->GetClass() != NULL); 2419 klass->SetObjectSize(sizeof(mirror::Proxy)); 2420 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2421 klass->SetClassLoader(loader); 2422 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2423 klass->SetName(name); 2424 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2425 klass->SetDexCache(proxy_class->GetDexCache()); 2426 2427 klass->SetStatus(mirror::Class::kStatusIdx); 2428 2429 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); 2430 2431 // Instance fields are inherited, but we add a couple of static fields... 2432 klass->SetSFields(AllocArtFieldArray(self, 2)); 2433 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2434 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2435 SirtRef<mirror::ArtField> interfaces_sfield(self, AllocArtField(self)); 2436 klass->SetStaticField(0, interfaces_sfield.get()); 2437 interfaces_sfield->SetDexFieldIndex(0); 2438 interfaces_sfield->SetDeclaringClass(klass.get()); 2439 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2440 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2441 SirtRef<mirror::ArtField> throws_sfield(self, AllocArtField(self)); 2442 klass->SetStaticField(1, throws_sfield.get()); 2443 throws_sfield->SetDexFieldIndex(1); 2444 throws_sfield->SetDeclaringClass(klass.get()); 2445 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2446 2447 // Proxies have 1 direct method, the constructor 2448 klass->SetDirectMethods(AllocArtMethodArray(self, 1)); 2449 klass->SetDirectMethod(0, CreateProxyConstructor(self, klass, proxy_class)); 2450 2451 // Create virtual method using specified prototypes 2452 size_t num_virtual_methods = methods->GetLength(); 2453 klass->SetVirtualMethods(AllocArtMethodArray(self, num_virtual_methods)); 2454 for (size_t i = 0; i < num_virtual_methods; ++i) { 2455 SirtRef<mirror::ArtMethod> prototype(self, methods->Get(i)); 2456 klass->SetVirtualMethod(i, CreateProxyMethod(self, klass, prototype)); 2457 } 2458 2459 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2460 klass->SetStatus(mirror::Class::kStatusLoaded); // Class is now effectively in the loaded state 2461 self->AssertNoPendingException(); 2462 2463 // Link the fields and virtual methods, creating vtable and iftables 2464 if (!LinkClass(klass, interfaces)) { 2465 klass->SetStatus(mirror::Class::kStatusError); 2466 return NULL; 2467 } 2468 { 2469 ObjectLock lock(self, klass.get()); // Must hold lock on object when initializing. 2470 interfaces_sfield->SetObject(klass.get(), interfaces); 2471 throws_sfield->SetObject(klass.get(), throws); 2472 klass->SetStatus(mirror::Class::kStatusInitialized); 2473 } 2474 2475 // sanity checks 2476 if (kIsDebugBuild) { 2477 CHECK(klass->GetIFields() == NULL); 2478 CheckProxyConstructor(klass->GetDirectMethod(0)); 2479 for (size_t i = 0; i < num_virtual_methods; ++i) { 2480 SirtRef<mirror::ArtMethod> prototype(self, methods->Get(i)); 2481 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2482 } 2483 2484 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2485 name->ToModifiedUtf8().c_str())); 2486 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2487 2488 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2489 name->ToModifiedUtf8().c_str())); 2490 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2491 2492 mirror::SynthesizedProxyClass* synth_proxy_class = 2493 down_cast<mirror::SynthesizedProxyClass*>(klass.get()); 2494 CHECK_EQ(synth_proxy_class->GetInterfaces(), interfaces); 2495 CHECK_EQ(synth_proxy_class->GetThrows(), throws); 2496 } 2497 return klass.get(); 2498} 2499 2500std::string ClassLinker::GetDescriptorForProxy(const mirror::Class* proxy_class) { 2501 DCHECK(proxy_class->IsProxyClass()); 2502 mirror::String* name = proxy_class->GetName(); 2503 DCHECK(name != NULL); 2504 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2505} 2506 2507mirror::ArtMethod* ClassLinker::FindMethodForProxy(const mirror::Class* proxy_class, 2508 const mirror::ArtMethod* proxy_method) { 2509 DCHECK(proxy_class->IsProxyClass()); 2510 DCHECK(proxy_method->IsProxyMethod()); 2511 // Locate the dex cache of the original interface/Object 2512 mirror::DexCache* dex_cache = NULL; 2513 { 2514 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2515 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2516 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2517 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2518 dex_cache = dex_caches_[i]; 2519 break; 2520 } 2521 } 2522 } 2523 CHECK(dex_cache != NULL); 2524 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2525 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2526 CHECK(resolved_method != NULL); 2527 return resolved_method; 2528} 2529 2530 2531mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2532 SirtRef<mirror::Class>& klass, 2533 mirror::Class* proxy_class) { 2534 // Create constructor for Proxy that must initialize h 2535 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2536 proxy_class->GetDirectMethods(); 2537 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2538 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2539 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2540 // code_ too) 2541 mirror::ArtMethod* constructor = 2542 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2543 // Make this constructor public and fix the class to be our Proxy version 2544 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2545 constructor->SetDeclaringClass(klass.get()); 2546 return constructor; 2547} 2548 2549static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2550 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2551 CHECK(constructor->IsConstructor()); 2552 MethodHelper mh(constructor); 2553 CHECK_STREQ(mh.GetName(), "<init>"); 2554 CHECK_EQ(mh.GetSignature(), std::string("(Ljava/lang/reflect/InvocationHandler;)V")); 2555 DCHECK(constructor->IsPublic()); 2556} 2557 2558mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, SirtRef<mirror::Class>& klass, 2559 SirtRef<mirror::ArtMethod>& prototype) { 2560 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2561 // prototype method 2562 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2563 prototype.get()); 2564 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2565 // as necessary 2566 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 2567 2568 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 2569 // the intersection of throw exceptions as defined in Proxy 2570 method->SetDeclaringClass(klass.get()); 2571 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 2572 2573 // At runtime the method looks like a reference and argument saving method, clone the code 2574 // related parameters from this method. 2575 mirror::ArtMethod* refs_and_args = 2576 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 2577 method->SetCoreSpillMask(refs_and_args->GetCoreSpillMask()); 2578 method->SetFpSpillMask(refs_and_args->GetFpSpillMask()); 2579 method->SetFrameSizeInBytes(refs_and_args->GetFrameSizeInBytes()); 2580 method->SetEntryPointFromCompiledCode(GetProxyInvokeHandler()); 2581 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2582 2583 return method; 2584} 2585 2586static void CheckProxyMethod(mirror::ArtMethod* method, 2587 SirtRef<mirror::ArtMethod>& prototype) 2588 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2589 // Basic sanity 2590 CHECK(!prototype->IsFinal()); 2591 CHECK(method->IsFinal()); 2592 CHECK(!method->IsAbstract()); 2593 2594 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 2595 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 2596 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 2597 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 2598 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 2599 CHECK_EQ(prototype->GetDexCacheInitializedStaticStorage(), 2600 method->GetDexCacheInitializedStaticStorage()); 2601 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 2602 2603 MethodHelper mh(method); 2604 MethodHelper mh2(prototype.get()); 2605 CHECK_STREQ(mh.GetName(), mh2.GetName()); 2606 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 2607 // More complex sanity - via dex cache 2608 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 2609} 2610 2611bool ClassLinker::InitializeClass(mirror::Class* klass, bool can_run_clinit, bool can_init_statics) { 2612 CHECK(klass->IsResolved() || klass->IsErroneous()) 2613 << PrettyClass(klass) << ": state=" << klass->GetStatus(); 2614 2615 Thread* self = Thread::Current(); 2616 2617 mirror::ArtMethod* clinit = NULL; 2618 { 2619 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 2620 ObjectLock lock(self, klass); 2621 2622 if (klass->GetStatus() == mirror::Class::kStatusInitialized) { 2623 return true; 2624 } 2625 2626 if (klass->IsErroneous()) { 2627 ThrowEarlierClassFailure(klass); 2628 return false; 2629 } 2630 2631 if (klass->GetStatus() == mirror::Class::kStatusResolved || 2632 klass->GetStatus() == mirror::Class::kStatusRetryVerificationAtRuntime) { 2633 VerifyClass(klass); 2634 if (klass->GetStatus() != mirror::Class::kStatusVerified) { 2635 if (klass->GetStatus() == mirror::Class::kStatusError) { 2636 CHECK(self->IsExceptionPending()); 2637 } 2638 return false; 2639 } 2640 } 2641 2642 clinit = klass->FindDeclaredDirectMethod("<clinit>", "()V"); 2643 if (clinit != NULL && !can_run_clinit) { 2644 // if the class has a <clinit> but we can't run it during compilation, 2645 // don't bother going to kStatusInitializing. We return false so that 2646 // sub-classes don't believe this class is initialized. 2647 // Opportunistically link non-static methods, TODO: don't initialize and dirty pages 2648 // in second pass. 2649 return false; 2650 } 2651 2652 // If the class is kStatusInitializing, either this thread is 2653 // initializing higher up the stack or another thread has beat us 2654 // to initializing and we need to wait. Either way, this 2655 // invocation of InitializeClass will not be responsible for 2656 // running <clinit> and will return. 2657 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 2658 // We caught somebody else in the act; was it us? 2659 if (klass->GetClinitThreadId() == self->GetTid()) { 2660 // Yes. That's fine. Return so we can continue initializing. 2661 return true; 2662 } 2663 // No. That's fine. Wait for another thread to finish initializing. 2664 return WaitForInitializeClass(klass, self, lock); 2665 } 2666 2667 if (!ValidateSuperClassDescriptors(klass)) { 2668 klass->SetStatus(mirror::Class::kStatusError); 2669 lock.NotifyAll(); 2670 return false; 2671 } 2672 2673 DCHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass); 2674 2675 klass->SetClinitThreadId(self->GetTid()); 2676 klass->SetStatus(mirror::Class::kStatusInitializing); 2677 } 2678 2679 uint64_t t0 = NanoTime(); 2680 2681 if (!InitializeSuperClass(klass, can_run_clinit, can_init_statics)) { 2682 // Super class initialization failed, this can be because we can't run 2683 // super-class class initializers in which case we'll be verified. 2684 // Otherwise this class is erroneous. 2685 if (!can_run_clinit) { 2686 CHECK(klass->IsVerified()); 2687 } else { 2688 CHECK(klass->IsErroneous()); 2689 } 2690 // Signal to any waiting threads that saw this class as initializing. 2691 ObjectLock lock(self, klass); 2692 lock.NotifyAll(); 2693 return false; 2694 } 2695 2696 bool has_static_field_initializers = InitializeStaticFields(klass); 2697 2698 if (clinit != NULL) { 2699 if (Runtime::Current()->IsStarted()) { 2700 JValue result; 2701 clinit->Invoke(self, NULL, 0, &result, 'V'); 2702 } else { 2703 art::interpreter::EnterInterpreterFromInvoke(self, clinit, NULL, NULL, NULL); 2704 } 2705 } 2706 2707 FixupStaticTrampolines(klass); 2708 2709 uint64_t t1 = NanoTime(); 2710 2711 bool success = true; 2712 { 2713 ObjectLock lock(self, klass); 2714 2715 if (self->IsExceptionPending()) { 2716 WrapExceptionInInitializer(); 2717 klass->SetStatus(mirror::Class::kStatusError); 2718 success = false; 2719 } else { 2720 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 2721 RuntimeStats* thread_stats = self->GetStats(); 2722 ++global_stats->class_init_count; 2723 ++thread_stats->class_init_count; 2724 global_stats->class_init_time_ns += (t1 - t0); 2725 thread_stats->class_init_time_ns += (t1 - t0); 2726 // Set the class as initialized except if we can't initialize static fields and static field 2727 // initialization is necessary. 2728 if (!can_init_statics && has_static_field_initializers) { 2729 klass->SetStatus(mirror::Class::kStatusVerified); // Don't leave class in initializing state. 2730 success = false; 2731 } else { 2732 klass->SetStatus(mirror::Class::kStatusInitialized); 2733 } 2734 if (VLOG_IS_ON(class_linker)) { 2735 ClassHelper kh(klass); 2736 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 2737 } 2738 } 2739 lock.NotifyAll(); 2740 } 2741 return success; 2742} 2743 2744bool ClassLinker::WaitForInitializeClass(mirror::Class* klass, Thread* self, ObjectLock& lock) 2745 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2746 while (true) { 2747 self->AssertNoPendingException(); 2748 lock.WaitIgnoringInterrupts(); 2749 2750 // When we wake up, repeat the test for init-in-progress. If 2751 // there's an exception pending (only possible if 2752 // "interruptShouldThrow" was set), bail out. 2753 if (self->IsExceptionPending()) { 2754 WrapExceptionInInitializer(); 2755 klass->SetStatus(mirror::Class::kStatusError); 2756 return false; 2757 } 2758 // Spurious wakeup? Go back to waiting. 2759 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 2760 continue; 2761 } 2762 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 2763 // Compile time initialization failed. 2764 return false; 2765 } 2766 if (klass->IsErroneous()) { 2767 // The caller wants an exception, but it was thrown in a 2768 // different thread. Synthesize one here. 2769 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 2770 PrettyDescriptor(klass).c_str()); 2771 return false; 2772 } 2773 if (klass->IsInitialized()) { 2774 return true; 2775 } 2776 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass) << " is " << klass->GetStatus(); 2777 } 2778 LOG(FATAL) << "Not Reached" << PrettyClass(klass); 2779} 2780 2781bool ClassLinker::ValidateSuperClassDescriptors(const mirror::Class* klass) { 2782 if (klass->IsInterface()) { 2783 return true; 2784 } 2785 // begin with the methods local to the superclass 2786 if (klass->HasSuperClass() && 2787 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 2788 const mirror::Class* super = klass->GetSuperClass(); 2789 for (int i = super->GetVTable()->GetLength() - 1; i >= 0; --i) { 2790 const mirror::ArtMethod* method = klass->GetVTable()->Get(i); 2791 if (method != super->GetVTable()->Get(i) && 2792 !IsSameMethodSignatureInDifferentClassContexts(method, super, klass)) { 2793 ThrowLinkageError(klass, "Class %s method %s resolves differently in superclass %s", 2794 PrettyDescriptor(klass).c_str(), PrettyMethod(method).c_str(), 2795 PrettyDescriptor(super).c_str()); 2796 return false; 2797 } 2798 } 2799 } 2800 mirror::IfTable* iftable = klass->GetIfTable(); 2801 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 2802 mirror::Class* interface = iftable->GetInterface(i); 2803 if (klass->GetClassLoader() != interface->GetClassLoader()) { 2804 for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { 2805 const mirror::ArtMethod* method = iftable->GetMethodArray(i)->Get(j); 2806 if (!IsSameMethodSignatureInDifferentClassContexts(method, interface, 2807 method->GetDeclaringClass())) { 2808 ThrowLinkageError(klass, "Class %s method %s resolves differently in interface %s", 2809 PrettyDescriptor(method->GetDeclaringClass()).c_str(), 2810 PrettyMethod(method).c_str(), 2811 PrettyDescriptor(interface).c_str()); 2812 return false; 2813 } 2814 } 2815 } 2816 } 2817 return true; 2818} 2819 2820// Returns true if classes referenced by the signature of the method are the 2821// same classes in klass1 as they are in klass2. 2822bool ClassLinker::IsSameMethodSignatureInDifferentClassContexts(const mirror::ArtMethod* method, 2823 const mirror::Class* klass1, 2824 const mirror::Class* klass2) { 2825 if (klass1 == klass2) { 2826 return true; 2827 } 2828 const DexFile& dex_file = *method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 2829 const DexFile::ProtoId& proto_id = 2830 dex_file.GetMethodPrototype(dex_file.GetMethodId(method->GetDexMethodIndex())); 2831 for (DexFileParameterIterator it(dex_file, proto_id); it.HasNext(); it.Next()) { 2832 const char* descriptor = it.GetDescriptor(); 2833 if (descriptor == NULL) { 2834 break; 2835 } 2836 if (descriptor[0] == 'L' || descriptor[0] == '[') { 2837 // Found a non-primitive type. 2838 if (!IsSameDescriptorInDifferentClassContexts(descriptor, klass1, klass2)) { 2839 return false; 2840 } 2841 } 2842 } 2843 // Check the return type 2844 const char* descriptor = dex_file.GetReturnTypeDescriptor(proto_id); 2845 if (descriptor[0] == 'L' || descriptor[0] == '[') { 2846 if (!IsSameDescriptorInDifferentClassContexts(descriptor, klass1, klass2)) { 2847 return false; 2848 } 2849 } 2850 return true; 2851} 2852 2853// Returns true if the descriptor resolves to the same class in the context of klass1 and klass2. 2854bool ClassLinker::IsSameDescriptorInDifferentClassContexts(const char* descriptor, 2855 const mirror::Class* klass1, 2856 const mirror::Class* klass2) { 2857 CHECK(descriptor != NULL); 2858 CHECK(klass1 != NULL); 2859 CHECK(klass2 != NULL); 2860 if (klass1 == klass2) { 2861 return true; 2862 } 2863 mirror::Class* found1 = FindClass(descriptor, klass1->GetClassLoader()); 2864 if (found1 == NULL) { 2865 Thread::Current()->ClearException(); 2866 } 2867 mirror::Class* found2 = FindClass(descriptor, klass2->GetClassLoader()); 2868 if (found2 == NULL) { 2869 Thread::Current()->ClearException(); 2870 } 2871 return found1 == found2; 2872} 2873 2874bool ClassLinker::InitializeSuperClass(mirror::Class* klass, bool can_run_clinit, bool can_init_fields) { 2875 CHECK(klass != NULL); 2876 if (!klass->IsInterface() && klass->HasSuperClass()) { 2877 mirror::Class* super_class = klass->GetSuperClass(); 2878 if (!super_class->IsInitialized()) { 2879 CHECK(!super_class->IsInterface()); 2880 // Must hold lock on object when initializing and setting status. 2881 Thread* self = Thread::Current(); 2882 ObjectLock lock(self, klass); 2883 bool super_initialized = InitializeClass(super_class, can_run_clinit, can_init_fields); 2884 // TODO: check for a pending exception 2885 if (!super_initialized) { 2886 if (!can_run_clinit) { 2887 // Don't set status to error when we can't run <clinit>. 2888 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusInitializing) << PrettyClass(klass); 2889 klass->SetStatus(mirror::Class::kStatusVerified); 2890 return false; 2891 } 2892 klass->SetStatus(mirror::Class::kStatusError); 2893 klass->NotifyAll(self); 2894 return false; 2895 } 2896 } 2897 } 2898 return true; 2899} 2900 2901bool ClassLinker::EnsureInitialized(mirror::Class* c, bool can_run_clinit, bool can_init_fields) { 2902 DCHECK(c != NULL); 2903 if (c->IsInitialized()) { 2904 return true; 2905 } 2906 2907 Thread* self = Thread::Current(); 2908 ScopedThreadStateChange tsc(self, kRunnable); 2909 bool success = InitializeClass(c, can_run_clinit, can_init_fields); 2910 if (!success) { 2911 CHECK(self->IsExceptionPending() || !can_run_clinit) << PrettyClass(c); 2912 } 2913 return success; 2914} 2915 2916void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 2917 mirror::Class* c, SafeMap<uint32_t, mirror::ArtField*>& field_map) { 2918 mirror::ClassLoader* cl = c->GetClassLoader(); 2919 const byte* class_data = dex_file.GetClassData(dex_class_def); 2920 ClassDataItemIterator it(dex_file, class_data); 2921 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2922 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), c->GetDexCache(), cl, true)); 2923 } 2924} 2925 2926bool ClassLinker::InitializeStaticFields(mirror::Class* klass) { 2927 size_t num_static_fields = klass->NumStaticFields(); 2928 if (num_static_fields == 0) { 2929 return false; 2930 } 2931 mirror::DexCache* dex_cache = klass->GetDexCache(); 2932 // TODO: this seems like the wrong check. do we really want !IsPrimitive && !IsArray? 2933 if (dex_cache == NULL) { 2934 return false; 2935 } 2936 ClassHelper kh(klass); 2937 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 2938 CHECK(dex_class_def != NULL); 2939 const DexFile& dex_file = kh.GetDexFile(); 2940 EncodedStaticFieldValueIterator it(dex_file, dex_cache, klass->GetClassLoader(), 2941 this, *dex_class_def); 2942 2943 if (it.HasNext()) { 2944 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 2945 SafeMap<uint32_t, mirror::ArtField*> field_map; 2946 ConstructFieldMap(dex_file, *dex_class_def, klass, field_map); 2947 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 2948 it.ReadValueToField(field_map.Get(i)); 2949 } 2950 return true; 2951 } 2952 return false; 2953} 2954 2955bool ClassLinker::LinkClass(SirtRef<mirror::Class>& klass, 2956 mirror::ObjectArray<mirror::Class>* interfaces) { 2957 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 2958 if (!LinkSuperClass(klass)) { 2959 return false; 2960 } 2961 if (!LinkMethods(klass, interfaces)) { 2962 return false; 2963 } 2964 if (!LinkInstanceFields(klass)) { 2965 return false; 2966 } 2967 if (!LinkStaticFields(klass)) { 2968 return false; 2969 } 2970 CreateReferenceInstanceOffsets(klass); 2971 CreateReferenceStaticOffsets(klass); 2972 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 2973 klass->SetStatus(mirror::Class::kStatusResolved); 2974 return true; 2975} 2976 2977bool ClassLinker::LoadSuperAndInterfaces(SirtRef<mirror::Class>& klass, const DexFile& dex_file) { 2978 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 2979 StringPiece descriptor(dex_file.StringByTypeIdx(klass->GetDexTypeIndex())); 2980 const DexFile::ClassDef* class_def = dex_file.FindClassDef(descriptor); 2981 CHECK(class_def != NULL); 2982 uint16_t super_class_idx = class_def->superclass_idx_; 2983 if (super_class_idx != DexFile::kDexNoIndex16) { 2984 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.get()); 2985 if (super_class == NULL) { 2986 DCHECK(Thread::Current()->IsExceptionPending()); 2987 return false; 2988 } 2989 // Verify 2990 if (!klass->CanAccess(super_class)) { 2991 ThrowIllegalAccessError(klass.get(), "Class %s extended by class %s is inaccessible", 2992 PrettyDescriptor(super_class).c_str(), 2993 PrettyDescriptor(klass.get()).c_str()); 2994 return false; 2995 } 2996 klass->SetSuperClass(super_class); 2997 } 2998 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(*class_def); 2999 if (interfaces != NULL) { 3000 for (size_t i = 0; i < interfaces->Size(); i++) { 3001 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3002 mirror::Class* interface = ResolveType(dex_file, idx, klass.get()); 3003 if (interface == NULL) { 3004 DCHECK(Thread::Current()->IsExceptionPending()); 3005 return false; 3006 } 3007 // Verify 3008 if (!klass->CanAccess(interface)) { 3009 // TODO: the RI seemed to ignore this in my testing. 3010 ThrowIllegalAccessError(klass.get(), "Interface %s implemented by class %s is inaccessible", 3011 PrettyDescriptor(interface).c_str(), 3012 PrettyDescriptor(klass.get()).c_str()); 3013 return false; 3014 } 3015 } 3016 } 3017 // Mark the class as loaded. 3018 klass->SetStatus(mirror::Class::kStatusLoaded); 3019 return true; 3020} 3021 3022bool ClassLinker::LinkSuperClass(SirtRef<mirror::Class>& klass) { 3023 CHECK(!klass->IsPrimitive()); 3024 mirror::Class* super = klass->GetSuperClass(); 3025 if (klass.get() == GetClassRoot(kJavaLangObject)) { 3026 if (super != NULL) { 3027 ThrowClassFormatError(klass.get(), "java.lang.Object must not have a superclass"); 3028 return false; 3029 } 3030 return true; 3031 } 3032 if (super == NULL) { 3033 ThrowLinkageError(klass.get(), "No superclass defined for class %s", 3034 PrettyDescriptor(klass.get()).c_str()); 3035 return false; 3036 } 3037 // Verify 3038 if (super->IsFinal() || super->IsInterface()) { 3039 ThrowIncompatibleClassChangeError(klass.get(), "Superclass %s of %s is %s", 3040 PrettyDescriptor(super).c_str(), 3041 PrettyDescriptor(klass.get()).c_str(), 3042 super->IsFinal() ? "declared final" : "an interface"); 3043 return false; 3044 } 3045 if (!klass->CanAccess(super)) { 3046 ThrowIllegalAccessError(klass.get(), "Superclass %s is inaccessible to class %s", 3047 PrettyDescriptor(super).c_str(), 3048 PrettyDescriptor(klass.get()).c_str()); 3049 return false; 3050 } 3051 3052 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3053 if (super->IsFinalizable()) { 3054 klass->SetFinalizable(); 3055 } 3056 3057 // Inherit reference flags (if any) from the superclass. 3058 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3059 if (reference_flags != 0) { 3060 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3061 } 3062 // Disallow custom direct subclasses of java.lang.ref.Reference. 3063 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3064 ThrowLinkageError(klass.get(), 3065 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3066 PrettyDescriptor(klass.get()).c_str()); 3067 return false; 3068 } 3069 3070#ifndef NDEBUG 3071 // Ensure super classes are fully resolved prior to resolving fields.. 3072 while (super != NULL) { 3073 CHECK(super->IsResolved()); 3074 super = super->GetSuperClass(); 3075 } 3076#endif 3077 return true; 3078} 3079 3080// Populate the class vtable and itable. Compute return type indices. 3081bool ClassLinker::LinkMethods(SirtRef<mirror::Class>& klass, 3082 mirror::ObjectArray<mirror::Class>* interfaces) { 3083 if (klass->IsInterface()) { 3084 // No vtable. 3085 size_t count = klass->NumVirtualMethods(); 3086 if (!IsUint(16, count)) { 3087 ThrowClassFormatError(klass.get(), "Too many methods on interface: %zd", count); 3088 return false; 3089 } 3090 for (size_t i = 0; i < count; ++i) { 3091 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3092 } 3093 // Link interface method tables 3094 return LinkInterfaceMethods(klass, interfaces); 3095 } else { 3096 // Link virtual and interface method tables 3097 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3098 } 3099 return true; 3100} 3101 3102bool ClassLinker::LinkVirtualMethods(SirtRef<mirror::Class>& klass) { 3103 Thread* self = Thread::Current(); 3104 if (klass->HasSuperClass()) { 3105 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3106 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3107 CHECK_LE(actual_count, max_count); 3108 // TODO: do not assign to the vtable field until it is fully constructed. 3109 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3110 vtable(self, klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count)); 3111 // See if any of our virtual methods override the superclass. 3112 MethodHelper local_mh(NULL, this); 3113 MethodHelper super_mh(NULL, this); 3114 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3115 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3116 local_mh.ChangeMethod(local_method); 3117 size_t j = 0; 3118 for (; j < actual_count; ++j) { 3119 mirror::ArtMethod* super_method = vtable->Get(j); 3120 super_mh.ChangeMethod(super_method); 3121 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3122 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3123 if (super_method->IsFinal()) { 3124 ThrowLinkageError(klass.get(), "Method %s overrides final method in class %s", 3125 PrettyMethod(local_method).c_str(), 3126 super_mh.GetDeclaringClassDescriptor()); 3127 return false; 3128 } 3129 vtable->Set(j, local_method); 3130 local_method->SetMethodIndex(j); 3131 break; 3132 } else { 3133 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3134 << " would have incorrectly overridden the package-private method in " 3135 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3136 } 3137 } 3138 } 3139 if (j == actual_count) { 3140 // Not overriding, append. 3141 vtable->Set(actual_count, local_method); 3142 local_method->SetMethodIndex(actual_count); 3143 actual_count += 1; 3144 } 3145 } 3146 if (!IsUint(16, actual_count)) { 3147 ThrowClassFormatError(klass.get(), "Too many methods defined on class: %zd", actual_count); 3148 return false; 3149 } 3150 // Shrink vtable if possible 3151 CHECK_LE(actual_count, max_count); 3152 if (actual_count < max_count) { 3153 vtable.reset(vtable->CopyOf(self, actual_count)); 3154 } 3155 klass->SetVTable(vtable.get()); 3156 } else { 3157 CHECK(klass.get() == GetClassRoot(kJavaLangObject)); 3158 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3159 if (!IsUint(16, num_virtual_methods)) { 3160 ThrowClassFormatError(klass.get(), "Too many methods: %d", num_virtual_methods); 3161 return false; 3162 } 3163 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3164 vtable(self, AllocArtMethodArray(self, num_virtual_methods)); 3165 for (size_t i = 0; i < num_virtual_methods; ++i) { 3166 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3167 vtable->Set(i, virtual_method); 3168 virtual_method->SetMethodIndex(i & 0xFFFF); 3169 } 3170 klass->SetVTable(vtable.get()); 3171 } 3172 return true; 3173} 3174 3175bool ClassLinker::LinkInterfaceMethods(SirtRef<mirror::Class>& klass, 3176 mirror::ObjectArray<mirror::Class>* interfaces) { 3177 size_t super_ifcount; 3178 if (klass->HasSuperClass()) { 3179 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3180 } else { 3181 super_ifcount = 0; 3182 } 3183 size_t ifcount = super_ifcount; 3184 ClassHelper kh(klass.get(), this); 3185 uint32_t num_interfaces = interfaces == NULL ? kh.NumDirectInterfaces() : interfaces->GetLength(); 3186 ifcount += num_interfaces; 3187 for (size_t i = 0; i < num_interfaces; i++) { 3188 mirror::Class* interface = interfaces == NULL ? kh.GetDirectInterface(i) : interfaces->Get(i); 3189 ifcount += interface->GetIfTableCount(); 3190 } 3191 if (ifcount == 0) { 3192 // Class implements no interfaces. 3193 DCHECK_EQ(klass->GetIfTableCount(), 0); 3194 DCHECK(klass->GetIfTable() == NULL); 3195 return true; 3196 } 3197 if (ifcount == super_ifcount) { 3198 // Class implements same interfaces as parent, are any of these not marker interfaces? 3199 bool has_non_marker_interface = false; 3200 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3201 for (size_t i = 0; i < ifcount; ++i) { 3202 if (super_iftable->GetMethodArrayCount(i) > 0) { 3203 has_non_marker_interface = true; 3204 break; 3205 } 3206 } 3207 if (!has_non_marker_interface) { 3208 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3209 klass->SetIfTable(super_iftable); 3210 return true; 3211 } 3212 } 3213 Thread* self = Thread::Current(); 3214 SirtRef<mirror::IfTable> iftable(self, AllocIfTable(self, ifcount)); 3215 if (super_ifcount != 0) { 3216 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3217 for (size_t i = 0; i < super_ifcount; i++) { 3218 mirror::Class* super_interface = super_iftable->GetInterface(i); 3219 iftable->SetInterface(i, super_interface); 3220 } 3221 } 3222 // Flatten the interface inheritance hierarchy. 3223 size_t idx = super_ifcount; 3224 for (size_t i = 0; i < num_interfaces; i++) { 3225 mirror::Class* interface = interfaces == NULL ? kh.GetDirectInterface(i) : interfaces->Get(i); 3226 DCHECK(interface != NULL); 3227 if (!interface->IsInterface()) { 3228 ClassHelper ih(interface); 3229 ThrowIncompatibleClassChangeError(klass.get(), "Class %s implements non-interface class %s", 3230 PrettyDescriptor(klass.get()).c_str(), 3231 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3232 return false; 3233 } 3234 // Check if interface is already in iftable 3235 bool duplicate = false; 3236 for (size_t j = 0; j < idx; j++) { 3237 mirror::Class* existing_interface = iftable->GetInterface(j); 3238 if (existing_interface == interface) { 3239 duplicate = true; 3240 break; 3241 } 3242 } 3243 if (!duplicate) { 3244 // Add this non-duplicate interface. 3245 iftable->SetInterface(idx++, interface); 3246 // Add this interface's non-duplicate super-interfaces. 3247 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3248 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3249 bool super_duplicate = false; 3250 for (size_t k = 0; k < idx; k++) { 3251 mirror::Class* existing_interface = iftable->GetInterface(k); 3252 if (existing_interface == super_interface) { 3253 super_duplicate = true; 3254 break; 3255 } 3256 } 3257 if (!super_duplicate) { 3258 iftable->SetInterface(idx++, super_interface); 3259 } 3260 } 3261 } 3262 } 3263 // Shrink iftable in case duplicates were found 3264 if (idx < ifcount) { 3265 iftable.reset(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3266 ifcount = idx; 3267 } else { 3268 CHECK_EQ(idx, ifcount); 3269 } 3270 klass->SetIfTable(iftable.get()); 3271 3272 // If we're an interface, we don't need the vtable pointers, so we're done. 3273 if (klass->IsInterface()) { 3274 return true; 3275 } 3276 std::vector<mirror::ArtMethod*> miranda_list; 3277 MethodHelper vtable_mh(NULL, this); 3278 MethodHelper interface_mh(NULL, this); 3279 for (size_t i = 0; i < ifcount; ++i) { 3280 mirror::Class* interface = iftable->GetInterface(i); 3281 size_t num_methods = interface->NumVirtualMethods(); 3282 if (num_methods > 0) { 3283 mirror::ObjectArray<mirror::ArtMethod>* method_array = 3284 AllocArtMethodArray(self, num_methods); 3285 iftable->SetMethodArray(i, method_array); 3286 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3287 for (size_t j = 0; j < num_methods; ++j) { 3288 mirror::ArtMethod* interface_method = interface->GetVirtualMethod(j); 3289 interface_mh.ChangeMethod(interface_method); 3290 int32_t k; 3291 // For each method listed in the interface's method list, find the 3292 // matching method in our class's method list. We want to favor the 3293 // subclass over the superclass, which just requires walking 3294 // back from the end of the vtable. (This only matters if the 3295 // superclass defines a private method and this class redefines 3296 // it -- otherwise it would use the same vtable slot. In .dex files 3297 // those don't end up in the virtual method table, so it shouldn't 3298 // matter which direction we go. We walk it backward anyway.) 3299 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3300 mirror::ArtMethod* vtable_method = vtable->Get(k); 3301 vtable_mh.ChangeMethod(vtable_method); 3302 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3303 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3304 ThrowIllegalAccessError(klass.get(), 3305 "Method '%s' implementing interface method '%s' is not public", 3306 PrettyMethod(vtable_method).c_str(), 3307 PrettyMethod(interface_method).c_str()); 3308 return false; 3309 } 3310 method_array->Set(j, vtable_method); 3311 break; 3312 } 3313 } 3314 if (k < 0) { 3315 SirtRef<mirror::ArtMethod> miranda_method(self, NULL); 3316 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3317 mirror::ArtMethod* mir_method = miranda_list[mir]; 3318 vtable_mh.ChangeMethod(mir_method); 3319 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3320 miranda_method.reset(miranda_list[mir]); 3321 break; 3322 } 3323 } 3324 if (miranda_method.get() == NULL) { 3325 // point the interface table at a phantom slot 3326 miranda_method.reset(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3327 miranda_list.push_back(miranda_method.get()); 3328 } 3329 method_array->Set(j, miranda_method.get()); 3330 } 3331 } 3332 } 3333 } 3334 if (!miranda_list.empty()) { 3335 int old_method_count = klass->NumVirtualMethods(); 3336 int new_method_count = old_method_count + miranda_list.size(); 3337 klass->SetVirtualMethods((old_method_count == 0) 3338 ? AllocArtMethodArray(self, new_method_count) 3339 : klass->GetVirtualMethods()->CopyOf(self, new_method_count)); 3340 3341 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3342 vtable(self, klass->GetVTableDuringLinking()); 3343 CHECK(vtable.get() != NULL); 3344 int old_vtable_count = vtable->GetLength(); 3345 int new_vtable_count = old_vtable_count + miranda_list.size(); 3346 vtable.reset(vtable->CopyOf(self, new_vtable_count)); 3347 for (size_t i = 0; i < miranda_list.size(); ++i) { 3348 mirror::ArtMethod* method = miranda_list[i]; 3349 // Leave the declaring class alone as type indices are relative to it 3350 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3351 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3352 klass->SetVirtualMethod(old_method_count + i, method); 3353 vtable->Set(old_vtable_count + i, method); 3354 } 3355 // TODO: do not assign to the vtable field until it is fully constructed. 3356 klass->SetVTable(vtable.get()); 3357 } 3358 3359 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3360 for (int i = 0; i < vtable->GetLength(); ++i) { 3361 CHECK(vtable->Get(i) != NULL); 3362 } 3363 3364// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3365 3366 return true; 3367} 3368 3369bool ClassLinker::LinkInstanceFields(SirtRef<mirror::Class>& klass) { 3370 CHECK(klass.get() != NULL); 3371 return LinkFields(klass, false); 3372} 3373 3374bool ClassLinker::LinkStaticFields(SirtRef<mirror::Class>& klass) { 3375 CHECK(klass.get() != NULL); 3376 size_t allocated_class_size = klass->GetClassSize(); 3377 bool success = LinkFields(klass, true); 3378 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3379 return success; 3380} 3381 3382struct LinkFieldsComparator { 3383 explicit LinkFieldsComparator(FieldHelper* fh) 3384 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 3385 : fh_(fh) {} 3386 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3387 bool operator()(const mirror::ArtField* field1, const mirror::ArtField* field2) 3388 NO_THREAD_SAFETY_ANALYSIS { 3389 // First come reference fields, then 64-bit, and finally 32-bit 3390 fh_->ChangeField(field1); 3391 Primitive::Type type1 = fh_->GetTypeAsPrimitiveType(); 3392 fh_->ChangeField(field2); 3393 Primitive::Type type2 = fh_->GetTypeAsPrimitiveType(); 3394 bool isPrimitive1 = type1 != Primitive::kPrimNot; 3395 bool isPrimitive2 = type2 != Primitive::kPrimNot; 3396 bool is64bit1 = isPrimitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3397 bool is64bit2 = isPrimitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3398 int order1 = (!isPrimitive1 ? 0 : (is64bit1 ? 1 : 2)); 3399 int order2 = (!isPrimitive2 ? 0 : (is64bit2 ? 1 : 2)); 3400 if (order1 != order2) { 3401 return order1 < order2; 3402 } 3403 3404 // same basic group? then sort by string. 3405 fh_->ChangeField(field1); 3406 StringPiece name1(fh_->GetName()); 3407 fh_->ChangeField(field2); 3408 StringPiece name2(fh_->GetName()); 3409 return name1 < name2; 3410 } 3411 3412 FieldHelper* fh_; 3413}; 3414 3415bool ClassLinker::LinkFields(SirtRef<mirror::Class>& klass, bool is_static) { 3416 size_t num_fields = 3417 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3418 3419 mirror::ObjectArray<mirror::ArtField>* fields = 3420 is_static ? klass->GetSFields() : klass->GetIFields(); 3421 3422 // Initialize size and field_offset 3423 size_t size; 3424 MemberOffset field_offset(0); 3425 if (is_static) { 3426 size = klass->GetClassSize(); 3427 field_offset = mirror::Class::FieldsOffset(); 3428 } else { 3429 mirror::Class* super_class = klass->GetSuperClass(); 3430 if (super_class != NULL) { 3431 CHECK(super_class->IsResolved()); 3432 field_offset = MemberOffset(super_class->GetObjectSize()); 3433 } 3434 size = field_offset.Uint32Value(); 3435 } 3436 3437 CHECK_EQ(num_fields == 0, fields == NULL); 3438 3439 // we want a relatively stable order so that adding new fields 3440 // minimizes disruption of C++ version such as Class and Method. 3441 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3442 for (size_t i = 0; i < num_fields; i++) { 3443 grouped_and_sorted_fields.push_back(fields->Get(i)); 3444 } 3445 FieldHelper fh(NULL, this); 3446 std::sort(grouped_and_sorted_fields.begin(), 3447 grouped_and_sorted_fields.end(), 3448 LinkFieldsComparator(&fh)); 3449 3450 // References should be at the front. 3451 size_t current_field = 0; 3452 size_t num_reference_fields = 0; 3453 for (; current_field < num_fields; current_field++) { 3454 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3455 fh.ChangeField(field); 3456 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3457 bool isPrimitive = type != Primitive::kPrimNot; 3458 if (isPrimitive) { 3459 break; // past last reference, move on to the next phase 3460 } 3461 grouped_and_sorted_fields.pop_front(); 3462 num_reference_fields++; 3463 fields->Set(current_field, field); 3464 field->SetOffset(field_offset); 3465 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3466 } 3467 3468 // Now we want to pack all of the double-wide fields together. If 3469 // we're not aligned, though, we want to shuffle one 32-bit field 3470 // into place. If we can't find one, we'll have to pad it. 3471 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3472 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3473 mirror::ArtField* field = grouped_and_sorted_fields[i]; 3474 fh.ChangeField(field); 3475 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3476 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3477 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 3478 continue; 3479 } 3480 fields->Set(current_field++, field); 3481 field->SetOffset(field_offset); 3482 // drop the consumed field 3483 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 3484 break; 3485 } 3486 // whether we found a 32-bit field for padding or not, we advance 3487 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3488 } 3489 3490 // Alignment is good, shuffle any double-wide fields forward, and 3491 // finish assigning field offsets to all fields. 3492 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 3493 while (!grouped_and_sorted_fields.empty()) { 3494 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3495 grouped_and_sorted_fields.pop_front(); 3496 fh.ChangeField(field); 3497 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3498 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3499 fields->Set(current_field, field); 3500 field->SetOffset(field_offset); 3501 field_offset = MemberOffset(field_offset.Uint32Value() + 3502 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 3503 ? sizeof(uint64_t) 3504 : sizeof(uint32_t))); 3505 current_field++; 3506 } 3507 3508 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 3509 if (!is_static && 3510 StringPiece(ClassHelper(klass.get(), this).GetDescriptor()) == "Ljava/lang/ref/Reference;") { 3511 // We know there are no non-reference fields in the Reference classes, and we know 3512 // that 'referent' is alphabetically last, so this is easy... 3513 CHECK_EQ(num_reference_fields, num_fields); 3514 fh.ChangeField(fields->Get(num_fields - 1)); 3515 CHECK_STREQ(fh.GetName(), "referent"); 3516 --num_reference_fields; 3517 } 3518 3519#ifndef NDEBUG 3520 // Make sure that all reference fields appear before 3521 // non-reference fields, and all double-wide fields are aligned. 3522 bool seen_non_ref = false; 3523 for (size_t i = 0; i < num_fields; i++) { 3524 mirror::ArtField* field = fields->Get(i); 3525 if (false) { // enable to debug field layout 3526 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 3527 << " class=" << PrettyClass(klass.get()) 3528 << " field=" << PrettyField(field) 3529 << " offset=" << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset()), 3530 false); 3531 } 3532 fh.ChangeField(field); 3533 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3534 bool is_primitive = type != Primitive::kPrimNot; 3535 if (StringPiece(ClassHelper(klass.get(), this).GetDescriptor()) == "Ljava/lang/ref/Reference;" && 3536 StringPiece(fh.GetName()) == "referent") { 3537 is_primitive = true; // We lied above, so we have to expect a lie here. 3538 } 3539 if (is_primitive) { 3540 if (!seen_non_ref) { 3541 seen_non_ref = true; 3542 DCHECK_EQ(num_reference_fields, i); 3543 } 3544 } else { 3545 DCHECK(!seen_non_ref); 3546 } 3547 } 3548 if (!seen_non_ref) { 3549 DCHECK_EQ(num_fields, num_reference_fields); 3550 } 3551#endif 3552 size = field_offset.Uint32Value(); 3553 // Update klass 3554 if (is_static) { 3555 klass->SetNumReferenceStaticFields(num_reference_fields); 3556 klass->SetClassSize(size); 3557 } else { 3558 klass->SetNumReferenceInstanceFields(num_reference_fields); 3559 if (!klass->IsVariableSize()) { 3560 DCHECK_GE(size, sizeof(mirror::Object)) << ClassHelper(klass.get(), this).GetDescriptor(); 3561 klass->SetObjectSize(size); 3562 } 3563 } 3564 return true; 3565} 3566 3567// Set the bitmap of reference offsets, refOffsets, from the ifields 3568// list. 3569void ClassLinker::CreateReferenceInstanceOffsets(SirtRef<mirror::Class>& klass) { 3570 uint32_t reference_offsets = 0; 3571 mirror::Class* super_class = klass->GetSuperClass(); 3572 if (super_class != NULL) { 3573 reference_offsets = super_class->GetReferenceInstanceOffsets(); 3574 // If our superclass overflowed, we don't stand a chance. 3575 if (reference_offsets == CLASS_WALK_SUPER) { 3576 klass->SetReferenceInstanceOffsets(reference_offsets); 3577 return; 3578 } 3579 } 3580 CreateReferenceOffsets(klass, false, reference_offsets); 3581} 3582 3583void ClassLinker::CreateReferenceStaticOffsets(SirtRef<mirror::Class>& klass) { 3584 CreateReferenceOffsets(klass, true, 0); 3585} 3586 3587void ClassLinker::CreateReferenceOffsets(SirtRef<mirror::Class>& klass, bool is_static, 3588 uint32_t reference_offsets) { 3589 size_t num_reference_fields = 3590 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 3591 : klass->NumReferenceInstanceFieldsDuringLinking(); 3592 const mirror::ObjectArray<mirror::ArtField>* fields = 3593 is_static ? klass->GetSFields() : klass->GetIFields(); 3594 // All of the fields that contain object references are guaranteed 3595 // to be at the beginning of the fields list. 3596 for (size_t i = 0; i < num_reference_fields; ++i) { 3597 // Note that byte_offset is the offset from the beginning of 3598 // object, not the offset into instance data 3599 const mirror::ArtField* field = fields->Get(i); 3600 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 3601 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 3602 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 3603 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 3604 CHECK_NE(new_bit, 0U); 3605 reference_offsets |= new_bit; 3606 } else { 3607 reference_offsets = CLASS_WALK_SUPER; 3608 break; 3609 } 3610 } 3611 // Update fields in klass 3612 if (is_static) { 3613 klass->SetReferenceStaticOffsets(reference_offsets); 3614 } else { 3615 klass->SetReferenceInstanceOffsets(reference_offsets); 3616 } 3617} 3618 3619mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, 3620 uint32_t string_idx, mirror::DexCache* dex_cache) { 3621 DCHECK(dex_cache != NULL); 3622 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 3623 if (resolved != NULL) { 3624 return resolved; 3625 } 3626 const DexFile::StringId& string_id = dex_file.GetStringId(string_idx); 3627 int32_t utf16_length = dex_file.GetStringLength(string_id); 3628 const char* utf8_data = dex_file.GetStringData(string_id); 3629 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 3630 dex_cache->SetResolvedString(string_idx, string); 3631 return string; 3632} 3633 3634mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, 3635 uint16_t type_idx, 3636 mirror::DexCache* dex_cache, 3637 mirror::ClassLoader* class_loader) { 3638 DCHECK(dex_cache != NULL); 3639 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 3640 if (resolved == NULL) { 3641 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 3642 resolved = FindClass(descriptor, class_loader); 3643 if (resolved != NULL) { 3644 // TODO: we used to throw here if resolved's class loader was not the 3645 // boot class loader. This was to permit different classes with the 3646 // same name to be loaded simultaneously by different loaders 3647 dex_cache->SetResolvedType(type_idx, resolved); 3648 } else { 3649 Thread* self = Thread::Current(); 3650 CHECK(self->IsExceptionPending()) 3651 << "Expected pending exception for failed resolution of: " << descriptor; 3652 // Convert a ClassNotFoundException to a NoClassDefFoundError. 3653 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 3654 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 3655 Thread::Current()->ClearException(); 3656 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 3657 self->GetException(NULL)->SetCause(cause.get()); 3658 } 3659 } 3660 } 3661 return resolved; 3662} 3663 3664mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 3665 uint32_t method_idx, 3666 mirror::DexCache* dex_cache, 3667 mirror::ClassLoader* class_loader, 3668 const mirror::ArtMethod* referrer, 3669 InvokeType type) { 3670 DCHECK(dex_cache != NULL); 3671 // Check for hit in the dex cache. 3672 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 3673 if (resolved != NULL) { 3674 return resolved; 3675 } 3676 // Fail, get the declaring class. 3677 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 3678 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 3679 if (klass == NULL) { 3680 DCHECK(Thread::Current()->IsExceptionPending()); 3681 return NULL; 3682 } 3683 // Scan using method_idx, this saves string compares but will only hit for matching dex 3684 // caches/files. 3685 switch (type) { 3686 case kDirect: // Fall-through. 3687 case kStatic: 3688 resolved = klass->FindDirectMethod(dex_cache, method_idx); 3689 break; 3690 case kInterface: 3691 resolved = klass->FindInterfaceMethod(dex_cache, method_idx); 3692 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 3693 break; 3694 case kSuper: // Fall-through. 3695 case kVirtual: 3696 resolved = klass->FindVirtualMethod(dex_cache, method_idx); 3697 break; 3698 default: 3699 LOG(FATAL) << "Unreachable - invocation type: " << type; 3700 } 3701 if (resolved == NULL) { 3702 // Search by name, which works across dex files. 3703 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 3704 std::string signature(dex_file.CreateMethodSignature(method_id.proto_idx_, NULL)); 3705 switch (type) { 3706 case kDirect: // Fall-through. 3707 case kStatic: 3708 resolved = klass->FindDirectMethod(name, signature); 3709 break; 3710 case kInterface: 3711 resolved = klass->FindInterfaceMethod(name, signature); 3712 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 3713 break; 3714 case kSuper: // Fall-through. 3715 case kVirtual: 3716 resolved = klass->FindVirtualMethod(name, signature); 3717 break; 3718 } 3719 } 3720 if (resolved != NULL) { 3721 // We found a method, check for incompatible class changes. 3722 if (resolved->CheckIncompatibleClassChange(type)) { 3723 resolved = NULL; 3724 } 3725 } 3726 if (resolved != NULL) { 3727 // Be a good citizen and update the dex cache to speed subsequent calls. 3728 dex_cache->SetResolvedMethod(method_idx, resolved); 3729 return resolved; 3730 } else { 3731 // We failed to find the method which means either an access error, an incompatible class 3732 // change, or no such method. First try to find the method among direct and virtual methods. 3733 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 3734 std::string signature(dex_file.CreateMethodSignature(method_id.proto_idx_, NULL)); 3735 switch (type) { 3736 case kDirect: 3737 case kStatic: 3738 resolved = klass->FindVirtualMethod(name, signature); 3739 break; 3740 case kInterface: 3741 case kVirtual: 3742 case kSuper: 3743 resolved = klass->FindDirectMethod(name, signature); 3744 break; 3745 } 3746 3747 // If we found something, check that it can be accessed by the referrer. 3748 if (resolved != NULL && referrer != NULL) { 3749 mirror::Class* methods_class = resolved->GetDeclaringClass(); 3750 mirror::Class* referring_class = referrer->GetDeclaringClass(); 3751 if (!referring_class->CanAccess(methods_class)) { 3752 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 3753 referrer, resolved, type); 3754 return NULL; 3755 } else if (!referring_class->CanAccessMember(methods_class, 3756 resolved->GetAccessFlags())) { 3757 ThrowIllegalAccessErrorMethod(referring_class, resolved); 3758 return NULL; 3759 } 3760 } 3761 3762 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 3763 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 3764 switch (type) { 3765 case kDirect: 3766 case kStatic: 3767 if (resolved != NULL) { 3768 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 3769 } else { 3770 resolved = klass->FindInterfaceMethod(name, signature); 3771 if (resolved != NULL) { 3772 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 3773 } else { 3774 ThrowNoSuchMethodError(type, klass, name, signature); 3775 } 3776 } 3777 break; 3778 case kInterface: 3779 if (resolved != NULL) { 3780 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 3781 } else { 3782 resolved = klass->FindVirtualMethod(name, signature); 3783 if (resolved != NULL) { 3784 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 3785 } else { 3786 ThrowNoSuchMethodError(type, klass, name, signature); 3787 } 3788 } 3789 break; 3790 case kSuper: 3791 ThrowNoSuchMethodError(type, klass, name, signature); 3792 break; 3793 case kVirtual: 3794 if (resolved != NULL) { 3795 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 3796 } else { 3797 resolved = klass->FindInterfaceMethod(name, signature); 3798 if (resolved != NULL) { 3799 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 3800 } else { 3801 ThrowNoSuchMethodError(type, klass, name, signature); 3802 } 3803 } 3804 break; 3805 } 3806 DCHECK(Thread::Current()->IsExceptionPending()); 3807 return NULL; 3808 } 3809} 3810 3811mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, 3812 uint32_t field_idx, 3813 mirror::DexCache* dex_cache, 3814 mirror::ClassLoader* class_loader, 3815 bool is_static) { 3816 DCHECK(dex_cache != NULL); 3817 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 3818 if (resolved != NULL) { 3819 return resolved; 3820 } 3821 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 3822 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 3823 if (klass == NULL) { 3824 DCHECK(Thread::Current()->IsExceptionPending()); 3825 return NULL; 3826 } 3827 3828 if (is_static) { 3829 resolved = klass->FindStaticField(dex_cache, field_idx); 3830 } else { 3831 resolved = klass->FindInstanceField(dex_cache, field_idx); 3832 } 3833 3834 if (resolved == NULL) { 3835 const char* name = dex_file.GetFieldName(field_id); 3836 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 3837 if (is_static) { 3838 resolved = klass->FindStaticField(name, type); 3839 } else { 3840 resolved = klass->FindInstanceField(name, type); 3841 } 3842 if (resolved == NULL) { 3843 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 3844 return NULL; 3845 } 3846 } 3847 dex_cache->SetResolvedField(field_idx, resolved); 3848 return resolved; 3849} 3850 3851mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 3852 uint32_t field_idx, 3853 mirror::DexCache* dex_cache, 3854 mirror::ClassLoader* class_loader) { 3855 DCHECK(dex_cache != NULL); 3856 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 3857 if (resolved != NULL) { 3858 return resolved; 3859 } 3860 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 3861 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 3862 if (klass == NULL) { 3863 DCHECK(Thread::Current()->IsExceptionPending()); 3864 return NULL; 3865 } 3866 3867 const char* name = dex_file.GetFieldName(field_id); 3868 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 3869 resolved = klass->FindField(name, type); 3870 if (resolved != NULL) { 3871 dex_cache->SetResolvedField(field_idx, resolved); 3872 } else { 3873 ThrowNoSuchFieldError("", klass, type, name); 3874 } 3875 return resolved; 3876} 3877 3878const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 3879 uint32_t* length) { 3880 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 3881 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 3882 const DexFile& dex_file = *dex_cache->GetDexFile(); 3883 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 3884 return dex_file.GetMethodShorty(method_id, length); 3885} 3886 3887void ClassLinker::DumpAllClasses(int flags) const { 3888 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 3889 // lock held, because it might need to resolve a field's type, which would try to take the lock. 3890 std::vector<mirror::Class*> all_classes; 3891 { 3892 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3893 typedef Table::const_iterator It; // TODO: C++0x auto 3894 for (It it = classes_.begin(), end = classes_.end(); it != end; ++it) { 3895 all_classes.push_back(it->second); 3896 } 3897 for (It it = image_classes_.begin(), end = image_classes_.end(); it != end; ++it) { 3898 all_classes.push_back(it->second); 3899 } 3900 } 3901 3902 for (size_t i = 0; i < all_classes.size(); ++i) { 3903 all_classes[i]->DumpClass(std::cerr, flags); 3904 } 3905} 3906 3907void ClassLinker::DumpForSigQuit(std::ostream& os) const { 3908 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3909 os << "Loaded classes: " << image_classes_.size() << " image classes; " 3910 << classes_.size() << " allocated classes\n"; 3911} 3912 3913size_t ClassLinker::NumLoadedClasses() const { 3914 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3915 return classes_.size() + image_classes_.size(); 3916} 3917 3918pid_t ClassLinker::GetClassesLockOwner() { 3919 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 3920} 3921 3922pid_t ClassLinker::GetDexLockOwner() { 3923 return dex_lock_.GetExclusiveOwnerTid(); 3924} 3925 3926void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 3927 DCHECK(!init_done_); 3928 3929 DCHECK(klass != NULL); 3930 DCHECK(klass->GetClassLoader() == NULL); 3931 3932 DCHECK(class_roots_ != NULL); 3933 DCHECK(class_roots_->Get(class_root) == NULL); 3934 class_roots_->Set(class_root, klass); 3935} 3936 3937} // namespace art 3938