class_linker.cc revision f1d3455064792ac1c486a4a9c24279a37b4af473
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/class.h" 47#include "mirror/class-inl.h" 48#include "mirror/class_loader.h" 49#include "mirror/dex_cache-inl.h" 50#include "mirror/field-inl.h" 51#include "mirror/iftable-inl.h" 52#include "mirror/abstract_method.h" 53#include "mirror/abstract_method-inl.h" 54#include "mirror/object-inl.h" 55#include "mirror/object_array-inl.h" 56#include "mirror/proxy.h" 57#include "mirror/stack_trace_element.h" 58#include "object_utils.h" 59#include "os.h" 60#include "runtime.h" 61#include "runtime_support.h" 62#if defined(ART_USE_PORTABLE_COMPILER) 63#include "runtime_support_llvm.h" 64#endif 65#include "ScopedLocalRef.h" 66#include "scoped_thread_state_change.h" 67#include "sirt_ref.h" 68#include "stack_indirect_reference_table.h" 69#include "thread.h" 70#include "UniquePtr.h" 71#include "utils.h" 72#include "verifier/method_verifier.h" 73#include "well_known_classes.h" 74 75namespace art { 76 77extern "C" void artInterpreterToQuickEntry(Thread* self, MethodHelper& mh, 78 const DexFile::CodeItem* code_item, 79 ShadowFrame* shadow_frame, JValue* result); 80 81static void ThrowNoClassDefFoundError(const char* fmt, ...) 82 __attribute__((__format__(__printf__, 1, 2))) 83 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 84static void ThrowNoClassDefFoundError(const char* fmt, ...) { 85 va_list args; 86 va_start(args, fmt); 87 Thread* self = Thread::Current(); 88 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 89 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 90 va_end(args); 91} 92 93static void ThrowEarlierClassFailure(mirror::Class* c) 94 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 95 // The class failed to initialize on a previous attempt, so we want to throw 96 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 97 // failed in verification, in which case v2 5.4.1 says we need to re-throw 98 // the previous error. 99 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 100 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 101 } 102 103 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 104 Thread* self = Thread::Current(); 105 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 106 if (c->GetVerifyErrorClass() != NULL) { 107 // TODO: change the verifier to store an _instance_, with a useful detail message? 108 ClassHelper ve_ch(c->GetVerifyErrorClass()); 109 self->ThrowNewException(throw_location, ve_ch.GetDescriptor(), PrettyDescriptor(c).c_str()); 110 } else { 111 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 112 PrettyDescriptor(c).c_str()); 113 } 114} 115 116static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 117 Thread* self = Thread::Current(); 118 JNIEnv* env = self->GetJniEnv(); 119 120 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 121 CHECK(cause.get() != NULL); 122 123 env->ExceptionClear(); 124 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 125 env->Throw(cause.get()); 126 127 // We only wrap non-Error exceptions; an Error can just be used as-is. 128 if (!is_error) { 129 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 130 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 131 } 132} 133 134static size_t Hash(const char* s) { 135 // This is the java.lang.String hashcode for convenience, not interoperability. 136 size_t hash = 0; 137 for (; *s != '\0'; ++s) { 138 hash = hash * 31 + *s; 139 } 140 return hash; 141} 142 143const char* ClassLinker::class_roots_descriptors_[] = { 144 "Ljava/lang/Class;", 145 "Ljava/lang/Object;", 146 "[Ljava/lang/Class;", 147 "[Ljava/lang/Object;", 148 "Ljava/lang/String;", 149 "Ljava/lang/DexCache;", 150 "Ljava/lang/ref/Reference;", 151 "Ljava/lang/reflect/Constructor;", 152 "Ljava/lang/reflect/Field;", 153 "Ljava/lang/reflect/AbstractMethod;", 154 "Ljava/lang/reflect/Method;", 155 "Ljava/lang/reflect/Proxy;", 156 "[Ljava/lang/String;", 157 "[Ljava/lang/reflect/AbstractMethod;", 158 "[Ljava/lang/reflect/Field;", 159 "[Ljava/lang/reflect/Method;", 160 "Ljava/lang/ClassLoader;", 161 "Ljava/lang/Throwable;", 162 "Ljava/lang/ClassNotFoundException;", 163 "Ljava/lang/StackTraceElement;", 164 "Z", 165 "B", 166 "C", 167 "D", 168 "F", 169 "I", 170 "J", 171 "S", 172 "V", 173 "[Z", 174 "[B", 175 "[C", 176 "[D", 177 "[F", 178 "[I", 179 "[J", 180 "[S", 181 "[Ljava/lang/StackTraceElement;", 182}; 183 184ClassLinker* ClassLinker::CreateFromCompiler(const std::vector<const DexFile*>& boot_class_path, 185 InternTable* intern_table) { 186 CHECK_NE(boot_class_path.size(), 0U); 187 UniquePtr<ClassLinker> class_linker(new ClassLinker(intern_table)); 188 class_linker->InitFromCompiler(boot_class_path); 189 return class_linker.release(); 190} 191 192ClassLinker* ClassLinker::CreateFromImage(InternTable* intern_table) { 193 UniquePtr<ClassLinker> class_linker(new ClassLinker(intern_table)); 194 class_linker->InitFromImage(); 195 return class_linker.release(); 196} 197 198ClassLinker::ClassLinker(InternTable* intern_table) 199 // dex_lock_ is recursive as it may be used in stack dumping. 200 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 201 class_roots_(NULL), 202 array_iftable_(NULL), 203 init_done_(false), 204 is_dirty_(false), 205 intern_table_(intern_table), 206 portable_resolution_trampoline_(NULL), 207 quick_resolution_trampoline_(NULL) { 208 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 209} 210 211void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 212 VLOG(startup) << "ClassLinker::Init"; 213 CHECK(Runtime::Current()->IsCompiler()); 214 215 CHECK(!init_done_); 216 217 // java_lang_Class comes first, it's needed for AllocClass 218 Thread* self = Thread::Current(); 219 gc::Heap* heap = Runtime::Current()->GetHeap(); 220 SirtRef<mirror::Class> 221 java_lang_Class(self, 222 down_cast<mirror::Class*>(heap->AllocObject(self, NULL, 223 sizeof(mirror::ClassClass)))); 224 CHECK(java_lang_Class.get() != NULL); 225 mirror::Class::SetClassClass(java_lang_Class.get()); 226 java_lang_Class->SetClass(java_lang_Class.get()); 227 java_lang_Class->SetClassSize(sizeof(mirror::ClassClass)); 228 // AllocClass(mirror::Class*) can now be used 229 230 // Class[] is used for reflection support. 231 SirtRef<mirror::Class> class_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 232 class_array_class->SetComponentType(java_lang_Class.get()); 233 234 // java_lang_Object comes next so that object_array_class can be created. 235 SirtRef<mirror::Class> java_lang_Object(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 236 CHECK(java_lang_Object.get() != NULL); 237 // backfill Object as the super class of Class. 238 java_lang_Class->SetSuperClass(java_lang_Object.get()); 239 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded); 240 241 // Object[] next to hold class roots. 242 SirtRef<mirror::Class> object_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 243 object_array_class->SetComponentType(java_lang_Object.get()); 244 245 // Setup the char class to be used for char[]. 246 SirtRef<mirror::Class> char_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 247 248 // Setup the char[] class to be used for String. 249 SirtRef<mirror::Class> char_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 250 char_array_class->SetComponentType(char_class.get()); 251 mirror::CharArray::SetArrayClass(char_array_class.get()); 252 253 // Setup String. 254 SirtRef<mirror::Class> java_lang_String(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::StringClass))); 255 mirror::String::SetClass(java_lang_String.get()); 256 java_lang_String->SetObjectSize(sizeof(mirror::String)); 257 java_lang_String->SetStatus(mirror::Class::kStatusResolved); 258 259 // Create storage for root classes, save away our work so far (requires descriptors). 260 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.get(), kClassRootsMax); 261 CHECK(class_roots_ != NULL); 262 SetClassRoot(kJavaLangClass, java_lang_Class.get()); 263 SetClassRoot(kJavaLangObject, java_lang_Object.get()); 264 SetClassRoot(kClassArrayClass, class_array_class.get()); 265 SetClassRoot(kObjectArrayClass, object_array_class.get()); 266 SetClassRoot(kCharArrayClass, char_array_class.get()); 267 SetClassRoot(kJavaLangString, java_lang_String.get()); 268 269 // Setup the primitive type classes. 270 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 271 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 272 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 273 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 274 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 275 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 276 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 277 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 278 279 // Create array interface entries to populate once we can load system classes. 280 array_iftable_ = AllocIfTable(self, 2); 281 282 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 283 SirtRef<mirror::Class> int_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 284 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 285 mirror::IntArray::SetArrayClass(int_array_class.get()); 286 SetClassRoot(kIntArrayClass, int_array_class.get()); 287 288 // now that these are registered, we can use AllocClass() and AllocObjectArray 289 290 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 291 SirtRef<mirror::Class> 292 java_lang_DexCache(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::DexCacheClass))); 293 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.get()); 294 java_lang_DexCache->SetObjectSize(sizeof(mirror::DexCacheClass)); 295 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved); 296 297 // Constructor, Field, Method, and AbstractMethod are necessary so that FindClass can link members. 298 SirtRef<mirror::Class> java_lang_reflect_Field(self, AllocClass(self, java_lang_Class.get(), 299 sizeof(mirror::FieldClass))); 300 CHECK(java_lang_reflect_Field.get() != NULL); 301 java_lang_reflect_Field->SetObjectSize(sizeof(mirror::Field)); 302 SetClassRoot(kJavaLangReflectField, java_lang_reflect_Field.get()); 303 java_lang_reflect_Field->SetStatus(mirror::Class::kStatusResolved); 304 mirror::Field::SetClass(java_lang_reflect_Field.get()); 305 306 SirtRef<mirror::Class> java_lang_reflect_AbstractMethod(self, AllocClass(self, java_lang_Class.get(), 307 sizeof(mirror::AbstractMethodClass))); 308 CHECK(java_lang_reflect_AbstractMethod.get() != NULL); 309 java_lang_reflect_AbstractMethod->SetObjectSize(sizeof(mirror::AbstractMethod)); 310 SetClassRoot(kJavaLangReflectAbstractMethod, java_lang_reflect_AbstractMethod.get()); 311 java_lang_reflect_AbstractMethod->SetStatus(mirror::Class::kStatusResolved); 312 313 SirtRef<mirror::Class> java_lang_reflect_Constructor(self, AllocClass(self, java_lang_Class.get(), 314 sizeof(mirror::AbstractMethodClass))); 315 CHECK(java_lang_reflect_Constructor.get() != NULL); 316 java_lang_reflect_Constructor->SetObjectSize(sizeof(mirror::Constructor)); 317 java_lang_reflect_Constructor->SetSuperClass(java_lang_reflect_AbstractMethod.get()); 318 SetClassRoot(kJavaLangReflectConstructor, java_lang_reflect_Constructor.get()); 319 java_lang_reflect_Constructor->SetStatus(mirror::Class::kStatusResolved); 320 321 SirtRef<mirror::Class> java_lang_reflect_Method(self, AllocClass(self, java_lang_Class.get(), 322 sizeof(mirror::AbstractMethodClass))); 323 CHECK(java_lang_reflect_Method.get() != NULL); 324 java_lang_reflect_Method->SetObjectSize(sizeof(mirror::Method)); 325 java_lang_reflect_Method->SetSuperClass(java_lang_reflect_AbstractMethod.get()); 326 SetClassRoot(kJavaLangReflectMethod, java_lang_reflect_Method.get()); 327 java_lang_reflect_Method->SetStatus(mirror::Class::kStatusResolved); 328 329 mirror::AbstractMethod::SetClasses(java_lang_reflect_Constructor.get(), 330 java_lang_reflect_Method.get()); 331 332 // Set up array classes for string, field, method 333 SirtRef<mirror::Class> object_array_string(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 334 object_array_string->SetComponentType(java_lang_String.get()); 335 SetClassRoot(kJavaLangStringArrayClass, object_array_string.get()); 336 337 SirtRef<mirror::Class> object_array_abstract_method(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 338 object_array_abstract_method->SetComponentType(java_lang_reflect_AbstractMethod.get()); 339 SetClassRoot(kJavaLangReflectAbstractMethodArrayClass, object_array_abstract_method.get()); 340 341 SirtRef<mirror::Class> object_array_field(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 342 object_array_field->SetComponentType(java_lang_reflect_Field.get()); 343 SetClassRoot(kJavaLangReflectFieldArrayClass, object_array_field.get()); 344 345 SirtRef<mirror::Class> object_array_method(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 346 object_array_method->SetComponentType(java_lang_reflect_Method.get()); 347 SetClassRoot(kJavaLangReflectMethodArrayClass, object_array_method.get()); 348 349 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 350 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 351 // these roots. 352 CHECK_NE(0U, boot_class_path.size()); 353 for (size_t i = 0; i != boot_class_path.size(); ++i) { 354 const DexFile* dex_file = boot_class_path[i]; 355 CHECK(dex_file != NULL); 356 AppendToBootClassPath(*dex_file); 357 } 358 359 // now we can use FindSystemClass 360 361 // run char class through InitializePrimitiveClass to finish init 362 InitializePrimitiveClass(char_class.get(), Primitive::kPrimChar); 363 SetClassRoot(kPrimitiveChar, char_class.get()); // needs descriptor 364 365 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 366 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady); 367 mirror::Class* Object_class = FindSystemClass("Ljava/lang/Object;"); 368 CHECK_EQ(java_lang_Object.get(), Object_class); 369 CHECK_EQ(java_lang_Object->GetObjectSize(), sizeof(mirror::Object)); 370 java_lang_String->SetStatus(mirror::Class::kStatusNotReady); 371 mirror::Class* String_class = FindSystemClass("Ljava/lang/String;"); 372 CHECK_EQ(java_lang_String.get(), String_class); 373 CHECK_EQ(java_lang_String->GetObjectSize(), sizeof(mirror::String)); 374 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady); 375 mirror::Class* DexCache_class = FindSystemClass("Ljava/lang/DexCache;"); 376 CHECK_EQ(java_lang_String.get(), String_class); 377 CHECK_EQ(java_lang_DexCache.get(), DexCache_class); 378 CHECK_EQ(java_lang_DexCache->GetObjectSize(), sizeof(mirror::DexCache)); 379 380 // Setup the primitive array type classes - can't be done until Object has a vtable. 381 SetClassRoot(kBooleanArrayClass, FindSystemClass("[Z")); 382 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 383 384 SetClassRoot(kByteArrayClass, FindSystemClass("[B")); 385 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 386 387 mirror::Class* found_char_array_class = FindSystemClass("[C"); 388 CHECK_EQ(char_array_class.get(), found_char_array_class); 389 390 SetClassRoot(kShortArrayClass, FindSystemClass("[S")); 391 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 392 393 mirror::Class* found_int_array_class = FindSystemClass("[I"); 394 CHECK_EQ(int_array_class.get(), found_int_array_class); 395 396 SetClassRoot(kLongArrayClass, FindSystemClass("[J")); 397 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 398 399 SetClassRoot(kFloatArrayClass, FindSystemClass("[F")); 400 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 401 402 SetClassRoot(kDoubleArrayClass, FindSystemClass("[D")); 403 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 404 405 mirror::Class* found_class_array_class = FindSystemClass("[Ljava/lang/Class;"); 406 CHECK_EQ(class_array_class.get(), found_class_array_class); 407 408 mirror::Class* found_object_array_class = FindSystemClass("[Ljava/lang/Object;"); 409 CHECK_EQ(object_array_class.get(), found_object_array_class); 410 411 // Setup the single, global copy of "iftable". 412 mirror::Class* java_lang_Cloneable = FindSystemClass("Ljava/lang/Cloneable;"); 413 CHECK(java_lang_Cloneable != NULL); 414 mirror::Class* java_io_Serializable = FindSystemClass("Ljava/io/Serializable;"); 415 CHECK(java_io_Serializable != NULL); 416 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 417 // crawl up and explicitly list all of the supers as well. 418 array_iftable_->SetInterface(0, java_lang_Cloneable); 419 array_iftable_->SetInterface(1, java_io_Serializable); 420 421 // Sanity check Class[] and Object[]'s interfaces. 422 ClassHelper kh(class_array_class.get(), this); 423 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 424 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 425 kh.ChangeClass(object_array_class.get()); 426 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 427 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 428 // Run Class, Constructor, Field, and Method through FindSystemClass. This initializes their 429 // dex_cache_ fields and register them in classes_. 430 mirror::Class* Class_class = FindSystemClass("Ljava/lang/Class;"); 431 CHECK_EQ(java_lang_Class.get(), Class_class); 432 433 java_lang_reflect_AbstractMethod->SetStatus(mirror::Class::kStatusNotReady); 434 mirror::Class* Abstract_method_class = FindSystemClass("Ljava/lang/reflect/AbstractMethod;"); 435 CHECK_EQ(java_lang_reflect_AbstractMethod.get(), Abstract_method_class); 436 437 // Method extends AbstractMethod so must reset after. 438 java_lang_reflect_Method->SetStatus(mirror::Class::kStatusNotReady); 439 mirror::Class* Method_class = FindSystemClass("Ljava/lang/reflect/Method;"); 440 CHECK_EQ(java_lang_reflect_Method.get(), Method_class); 441 442 // Constructor extends AbstractMethod so must reset after. 443 java_lang_reflect_Constructor->SetStatus(mirror::Class::kStatusNotReady); 444 mirror::Class* Constructor_class = FindSystemClass("Ljava/lang/reflect/Constructor;"); 445 CHECK_EQ(java_lang_reflect_Constructor.get(), Constructor_class); 446 447 java_lang_reflect_Field->SetStatus(mirror::Class::kStatusNotReady); 448 mirror::Class* Field_class = FindSystemClass("Ljava/lang/reflect/Field;"); 449 CHECK_EQ(java_lang_reflect_Field.get(), Field_class); 450 451 mirror::Class* String_array_class = FindSystemClass(class_roots_descriptors_[kJavaLangStringArrayClass]); 452 CHECK_EQ(object_array_string.get(), String_array_class); 453 454 mirror::Class* Abstract_method_array_class = 455 FindSystemClass(class_roots_descriptors_[kJavaLangReflectAbstractMethodArrayClass]); 456 CHECK_EQ(object_array_abstract_method.get(), Abstract_method_array_class); 457 458 mirror::Class* Field_array_class = FindSystemClass(class_roots_descriptors_[kJavaLangReflectFieldArrayClass]); 459 CHECK_EQ(object_array_field.get(), Field_array_class); 460 461 mirror::Class* Method_array_class = 462 FindSystemClass(class_roots_descriptors_[kJavaLangReflectMethodArrayClass]); 463 CHECK_EQ(object_array_method.get(), Method_array_class); 464 465 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 466 467 // Create java.lang.reflect.Proxy root. 468 mirror::Class* java_lang_reflect_Proxy = FindSystemClass("Ljava/lang/reflect/Proxy;"); 469 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 470 471 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 472 mirror::Class* java_lang_ref_Reference = FindSystemClass("Ljava/lang/ref/Reference;"); 473 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference); 474 mirror::Class* java_lang_ref_FinalizerReference = FindSystemClass("Ljava/lang/ref/FinalizerReference;"); 475 java_lang_ref_FinalizerReference->SetAccessFlags( 476 java_lang_ref_FinalizerReference->GetAccessFlags() | 477 kAccClassIsReference | kAccClassIsFinalizerReference); 478 mirror::Class* java_lang_ref_PhantomReference = FindSystemClass("Ljava/lang/ref/PhantomReference;"); 479 java_lang_ref_PhantomReference->SetAccessFlags( 480 java_lang_ref_PhantomReference->GetAccessFlags() | 481 kAccClassIsReference | kAccClassIsPhantomReference); 482 mirror::Class* java_lang_ref_SoftReference = FindSystemClass("Ljava/lang/ref/SoftReference;"); 483 java_lang_ref_SoftReference->SetAccessFlags( 484 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 485 mirror::Class* java_lang_ref_WeakReference = FindSystemClass("Ljava/lang/ref/WeakReference;"); 486 java_lang_ref_WeakReference->SetAccessFlags( 487 java_lang_ref_WeakReference->GetAccessFlags() | 488 kAccClassIsReference | kAccClassIsWeakReference); 489 490 // Setup the ClassLoader, verifying the object_size_. 491 mirror::Class* java_lang_ClassLoader = FindSystemClass("Ljava/lang/ClassLoader;"); 492 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), sizeof(mirror::ClassLoader)); 493 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 494 495 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 496 // java.lang.StackTraceElement as a convenience. 497 SetClassRoot(kJavaLangThrowable, FindSystemClass("Ljava/lang/Throwable;")); 498 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 499 SetClassRoot(kJavaLangClassNotFoundException, FindSystemClass("Ljava/lang/ClassNotFoundException;")); 500 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass("Ljava/lang/StackTraceElement;")); 501 SetClassRoot(kJavaLangStackTraceElementArrayClass, FindSystemClass("[Ljava/lang/StackTraceElement;")); 502 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 503 504 FinishInit(); 505 506 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 507} 508 509void ClassLinker::FinishInit() { 510 VLOG(startup) << "ClassLinker::FinishInit entering"; 511 512 // Let the heap know some key offsets into java.lang.ref instances 513 // Note: we hard code the field indexes here rather than using FindInstanceField 514 // as the types of the field can't be resolved prior to the runtime being 515 // fully initialized 516 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 517 mirror::Class* java_lang_ref_ReferenceQueue = FindSystemClass("Ljava/lang/ref/ReferenceQueue;"); 518 mirror::Class* java_lang_ref_FinalizerReference = FindSystemClass("Ljava/lang/ref/FinalizerReference;"); 519 520 const DexFile& java_lang_dex = *java_lang_ref_Reference->GetDexCache()->GetDexFile(); 521 522 mirror::Field* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 523 FieldHelper fh(pendingNext, this); 524 CHECK_STREQ(fh.GetName(), "pendingNext"); 525 CHECK_EQ(java_lang_dex.GetFieldId(pendingNext->GetDexFieldIndex()).type_idx_, 526 java_lang_ref_Reference->GetDexTypeIndex()); 527 528 mirror::Field* queue = java_lang_ref_Reference->GetInstanceField(1); 529 fh.ChangeField(queue); 530 CHECK_STREQ(fh.GetName(), "queue"); 531 CHECK_EQ(java_lang_dex.GetFieldId(queue->GetDexFieldIndex()).type_idx_, 532 java_lang_ref_ReferenceQueue->GetDexTypeIndex()); 533 534 mirror::Field* queueNext = java_lang_ref_Reference->GetInstanceField(2); 535 fh.ChangeField(queueNext); 536 CHECK_STREQ(fh.GetName(), "queueNext"); 537 CHECK_EQ(java_lang_dex.GetFieldId(queueNext->GetDexFieldIndex()).type_idx_, 538 java_lang_ref_Reference->GetDexTypeIndex()); 539 540 mirror::Field* referent = java_lang_ref_Reference->GetInstanceField(3); 541 fh.ChangeField(referent); 542 CHECK_STREQ(fh.GetName(), "referent"); 543 CHECK_EQ(java_lang_dex.GetFieldId(referent->GetDexFieldIndex()).type_idx_, 544 GetClassRoot(kJavaLangObject)->GetDexTypeIndex()); 545 546 mirror::Field* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 547 fh.ChangeField(zombie); 548 CHECK_STREQ(fh.GetName(), "zombie"); 549 CHECK_EQ(java_lang_dex.GetFieldId(zombie->GetDexFieldIndex()).type_idx_, 550 GetClassRoot(kJavaLangObject)->GetDexTypeIndex()); 551 552 gc::Heap* heap = Runtime::Current()->GetHeap(); 553 heap->SetReferenceOffsets(referent->GetOffset(), 554 queue->GetOffset(), 555 queueNext->GetOffset(), 556 pendingNext->GetOffset(), 557 zombie->GetOffset()); 558 559 // ensure all class_roots_ are initialized 560 for (size_t i = 0; i < kClassRootsMax; i++) { 561 ClassRoot class_root = static_cast<ClassRoot>(i); 562 mirror::Class* klass = GetClassRoot(class_root); 563 CHECK(klass != NULL); 564 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 565 // note SetClassRoot does additional validation. 566 // if possible add new checks there to catch errors early 567 } 568 569 CHECK(array_iftable_ != NULL); 570 571 // disable the slow paths in FindClass and CreatePrimitiveClass now 572 // that Object, Class, and Object[] are setup 573 init_done_ = true; 574 575 VLOG(startup) << "ClassLinker::FinishInit exiting"; 576} 577 578void ClassLinker::RunRootClinits() { 579 Thread* self = Thread::Current(); 580 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 581 mirror::Class* c = GetClassRoot(ClassRoot(i)); 582 if (!c->IsArrayClass() && !c->IsPrimitive()) { 583 EnsureInitialized(GetClassRoot(ClassRoot(i)), true, true); 584 self->AssertNoPendingException(); 585 } 586 } 587} 588 589bool ClassLinker::GenerateOatFile(const std::string& dex_filename, 590 int oat_fd, 591 const std::string& oat_cache_filename) { 592 std::string dex2oat_string(GetAndroidRoot()); 593 dex2oat_string += (kIsDebugBuild ? "/bin/dex2oatd" : "/bin/dex2oat"); 594 const char* dex2oat = dex2oat_string.c_str(); 595 596 const char* class_path = Runtime::Current()->GetClassPathString().c_str(); 597 598 gc::Heap* heap = Runtime::Current()->GetHeap(); 599 std::string boot_image_option_string("--boot-image="); 600 boot_image_option_string += heap->GetImageSpace()->GetImageFilename(); 601 const char* boot_image_option = boot_image_option_string.c_str(); 602 603 std::string dex_file_option_string("--dex-file="); 604 dex_file_option_string += dex_filename; 605 const char* dex_file_option = dex_file_option_string.c_str(); 606 607 std::string oat_fd_option_string("--oat-fd="); 608 StringAppendF(&oat_fd_option_string, "%d", oat_fd); 609 const char* oat_fd_option = oat_fd_option_string.c_str(); 610 611 std::string oat_location_option_string("--oat-location="); 612 oat_location_option_string += oat_cache_filename; 613 const char* oat_location_option = oat_location_option_string.c_str(); 614 615 // fork and exec dex2oat 616 pid_t pid = fork(); 617 if (pid == 0) { 618 // no allocation allowed between fork and exec 619 620 // change process groups, so we don't get reaped by ProcessManager 621 setpgid(0, 0); 622 623 VLOG(class_linker) << dex2oat 624 << " --runtime-arg -Xms64m" 625 << " --runtime-arg -Xmx64m" 626 << " --runtime-arg -classpath" 627 << " --runtime-arg " << class_path 628#if !defined(ART_TARGET) 629 << " --host" 630#endif 631 << " " << boot_image_option 632 << " " << dex_file_option 633 << " " << oat_fd_option 634 << " " << oat_location_option; 635 636 execl(dex2oat, dex2oat, 637 "--runtime-arg", "-Xms64m", 638 "--runtime-arg", "-Xmx64m", 639 "--runtime-arg", "-classpath", 640 "--runtime-arg", class_path, 641#if !defined(ART_TARGET) 642 "--host", 643#endif 644 boot_image_option, 645 dex_file_option, 646 oat_fd_option, 647 oat_location_option, 648 NULL); 649 650 PLOG(FATAL) << "execl(" << dex2oat << ") failed"; 651 return false; 652 } else { 653 // wait for dex2oat to finish 654 int status; 655 pid_t got_pid = TEMP_FAILURE_RETRY(waitpid(pid, &status, 0)); 656 if (got_pid != pid) { 657 PLOG(ERROR) << "waitpid failed: wanted " << pid << ", got " << got_pid; 658 return false; 659 } 660 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { 661 LOG(ERROR) << dex2oat << " failed with dex-file=" << dex_filename; 662 return false; 663 } 664 } 665 return true; 666} 667 668void ClassLinker::RegisterOatFile(const OatFile& oat_file) { 669 WriterMutexLock mu(Thread::Current(), dex_lock_); 670 RegisterOatFileLocked(oat_file); 671} 672 673void ClassLinker::RegisterOatFileLocked(const OatFile& oat_file) { 674 dex_lock_.AssertExclusiveHeld(Thread::Current()); 675 if (kIsDebugBuild) { 676 for (size_t i = 0; i < oat_files_.size(); ++i) { 677 CHECK_NE(&oat_file, oat_files_[i]) << oat_file.GetLocation(); 678 } 679 } 680 oat_files_.push_back(&oat_file); 681} 682 683OatFile* ClassLinker::OpenOat(const gc::space::ImageSpace* space) { 684 WriterMutexLock mu(Thread::Current(), dex_lock_); 685 const Runtime* runtime = Runtime::Current(); 686 const ImageHeader& image_header = space->GetImageHeader(); 687 // Grab location but don't use Object::AsString as we haven't yet initialized the roots to 688 // check the down cast 689 mirror::String* oat_location = 690 down_cast<mirror::String*>(image_header.GetImageRoot(ImageHeader::kOatLocation)); 691 std::string oat_filename; 692 oat_filename += runtime->GetHostPrefix(); 693 oat_filename += oat_location->ToModifiedUtf8(); 694 runtime->GetHeap()->UnReserveOatFileAddressRange(); 695 OatFile* oat_file = OatFile::Open(oat_filename, oat_filename, image_header.GetOatDataBegin(), 696 !Runtime::Current()->IsCompiler()); 697 VLOG(startup) << "ClassLinker::OpenOat entering oat_filename=" << oat_filename; 698 if (oat_file == NULL) { 699 LOG(ERROR) << "Failed to open oat file " << oat_filename << " referenced from image."; 700 return NULL; 701 } 702 uint32_t oat_checksum = oat_file->GetOatHeader().GetChecksum(); 703 uint32_t image_oat_checksum = image_header.GetOatChecksum(); 704 if (oat_checksum != image_oat_checksum) { 705 LOG(ERROR) << "Failed to match oat file checksum " << std::hex << oat_checksum 706 << " to expected oat checksum " << std::hex << image_oat_checksum 707 << " in image"; 708 return NULL; 709 } 710 RegisterOatFileLocked(*oat_file); 711 VLOG(startup) << "ClassLinker::OpenOat exiting"; 712 return oat_file; 713} 714 715const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 716 ReaderMutexLock mu(Thread::Current(), dex_lock_); 717 return FindOpenedOatFileFromDexLocation(dex_file.GetLocation()); 718} 719 720const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation(const std::string& dex_location) { 721 for (size_t i = 0; i < oat_files_.size(); i++) { 722 const OatFile* oat_file = oat_files_[i]; 723 DCHECK(oat_file != NULL); 724 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, false); 725 if (oat_dex_file != NULL) { 726 return oat_file; 727 } 728 } 729 return NULL; 730} 731 732const DexFile* ClassLinker::FindDexFileInOatLocation(const std::string& dex_location, 733 uint32_t dex_location_checksum, 734 const std::string& oat_location) { 735 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 736 !Runtime::Current()->IsCompiler())); 737 if (oat_file.get() == NULL) { 738 return NULL; 739 } 740 Runtime* runtime = Runtime::Current(); 741 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 742 if (oat_file->GetOatHeader().GetImageFileLocationOatChecksum() != image_header.GetOatChecksum()) { 743 return NULL; 744 } 745 if (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() 746 != reinterpret_cast<uint32_t>(image_header.GetOatDataBegin())) { 747 return NULL; 748 } 749 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location); 750 if (oat_dex_file == NULL) { 751 return NULL; 752 } 753 if (oat_dex_file->GetDexFileLocationChecksum() != dex_location_checksum) { 754 return NULL; 755 } 756 RegisterOatFileLocked(*oat_file.release()); 757 return oat_dex_file->OpenDexFile(); 758} 759 760const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation(const std::string& dex_location, 761 const std::string& oat_location) { 762 WriterMutexLock mu(Thread::Current(), dex_lock_); 763 return FindOrCreateOatFileForDexLocationLocked(dex_location, oat_location); 764} 765 766const DexFile* ClassLinker::FindOrCreateOatFileForDexLocationLocked(const std::string& dex_location, 767 const std::string& oat_location) { 768 uint32_t dex_location_checksum; 769 if (!DexFile::GetChecksum(dex_location, dex_location_checksum)) { 770 LOG(ERROR) << "Failed to compute checksum '" << dex_location << "'"; 771 return NULL; 772 } 773 774 // Check if we already have an up-to-date output file 775 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, 776 dex_location_checksum, 777 oat_location); 778 if (dex_file != NULL) { 779 return dex_file; 780 } 781 782 // Generate the output oat file for the dex file 783 UniquePtr<File> file(OS::OpenFile(oat_location.c_str(), true)); 784 if (file.get() == NULL) { 785 LOG(ERROR) << "Failed to create oat file: " << oat_location; 786 return NULL; 787 } 788 if (!GenerateOatFile(dex_location, file->Fd(), oat_location)) { 789 LOG(ERROR) << "Failed to generate oat file: " << oat_location; 790 return NULL; 791 } 792 const OatFile* oat_file = OatFile::Open(oat_location, oat_location, NULL, 793 !Runtime::Current()->IsCompiler()); 794 if (oat_file == NULL) { 795 LOG(ERROR) << "Failed to open generated oat file: " << oat_location; 796 return NULL; 797 } 798 RegisterOatFileLocked(*oat_file); 799 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location); 800 if (oat_dex_file == NULL) { 801 LOG(ERROR) << "Failed to find dex file in generated oat file: " << oat_location; 802 return NULL; 803 } 804 return oat_dex_file->OpenDexFile(); 805} 806 807bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 808 const std::string& dex_location, 809 uint32_t dex_location_checksum) { 810 Runtime* runtime = Runtime::Current(); 811 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 812 uint32_t image_oat_checksum = image_header.GetOatChecksum(); 813 uint32_t image_oat_data_begin = reinterpret_cast<uint32_t>(image_header.GetOatDataBegin()); 814 bool image_check = ((oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum) 815 && (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 816 817 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location); 818 if (oat_dex_file == NULL) { 819 LOG(ERROR) << "oat file " << oat_file->GetLocation() 820 << " does not contain contents for " << dex_location; 821 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 822 for (size_t i = 0; i < oat_dex_files.size(); i++) { 823 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 824 LOG(ERROR) << "oat file " << oat_file->GetLocation() 825 << " contains contents for " << oat_dex_file->GetDexFileLocation(); 826 } 827 return false; 828 } 829 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 830 831 if (image_check && dex_check) { 832 return true; 833 } 834 835 if (!image_check) { 836 std::string image_file(image_header.GetImageRoot( 837 ImageHeader::kOatLocation)->AsString()->ToModifiedUtf8()); 838 LOG(WARNING) << "oat file " << oat_file->GetLocation() 839 << " mismatch ( " << std::hex << oat_file->GetOatHeader().GetImageFileLocationOatChecksum() 840 << ", " << oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() 841 << ") with " << image_file 842 << " (" << image_oat_checksum << ", " << std::hex << image_oat_data_begin << ")"; 843 } 844 if (!dex_check) { 845 LOG(WARNING) << "oat file " << oat_file->GetLocation() 846 << " mismatch ( " << std::hex << oat_dex_file->GetDexFileLocationChecksum() 847 << ") with " << dex_location 848 << " (" << std::hex << dex_location_checksum << ")"; 849 } 850 return false; 851} 852 853const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const OatFile* oat_file, 854 const std::string& dex_location, 855 uint32_t dex_location_checksum) { 856 bool verified = VerifyOatFileChecksums(oat_file, dex_location, dex_location_checksum); 857 if (!verified) { 858 return NULL; 859 } 860 RegisterOatFileLocked(*oat_file); 861 return oat_file->GetOatDexFile(dex_location)->OpenDexFile(); 862} 863 864const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const std::string& dex_location) { 865 WriterMutexLock mu(Thread::Current(), dex_lock_); 866 867 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location); 868 if (open_oat_file != NULL) { 869 return open_oat_file->GetOatDexFile(dex_location)->OpenDexFile(); 870 } 871 872 // Look for an existing file next to dex. for example, for 873 // /foo/bar/baz.jar, look for /foo/bar/baz.odex. 874 std::string odex_filename(OatFile::DexFilenameToOdexFilename(dex_location)); 875 const OatFile* oat_file = FindOatFileFromOatLocationLocked(odex_filename); 876 if (oat_file != NULL) { 877 uint32_t dex_location_checksum; 878 if (!DexFile::GetChecksum(dex_location, dex_location_checksum)) { 879 // If no classes.dex found in dex_location, it has been stripped, assume oat is up-to-date. 880 // This is the common case in user builds for jar's and apk's in the /system directory. 881 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location); 882 CHECK(oat_dex_file != NULL) << odex_filename << " " << dex_location; 883 RegisterOatFileLocked(*oat_file); 884 return oat_dex_file->OpenDexFile(); 885 } 886 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(oat_file, 887 dex_location, 888 dex_location_checksum); 889 if (dex_file != NULL) { 890 return dex_file; 891 } 892 } 893 // Look for an existing file in the dalvik-cache, validating the result if found 894 // not found in /foo/bar/baz.odex? try /data/dalvik-cache/foo@bar@baz.jar@classes.dex 895 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location)); 896 oat_file = FindOatFileFromOatLocationLocked(cache_location); 897 if (oat_file != NULL) { 898 uint32_t dex_location_checksum; 899 if (!DexFile::GetChecksum(dex_location, dex_location_checksum)) { 900 LOG(WARNING) << "Failed to compute checksum: " << dex_location; 901 return NULL; 902 } 903 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(oat_file, 904 dex_location, 905 dex_location_checksum); 906 if (dex_file != NULL) { 907 return dex_file; 908 } 909 if (TEMP_FAILURE_RETRY(unlink(oat_file->GetLocation().c_str())) != 0) { 910 PLOG(FATAL) << "Failed to remove obsolete oat file " << oat_file->GetLocation(); 911 } 912 } 913 LOG(INFO) << "Failed to open oat file from " << odex_filename << " or " << cache_location << "."; 914 915 // Try to generate oat file if it wasn't found or was obsolete. 916 std::string oat_cache_filename(GetDalvikCacheFilenameOrDie(dex_location)); 917 return FindOrCreateOatFileForDexLocationLocked(dex_location, oat_cache_filename); 918} 919 920const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 921 for (size_t i = 0; i < oat_files_.size(); i++) { 922 const OatFile* oat_file = oat_files_[i]; 923 DCHECK(oat_file != NULL); 924 if (oat_file->GetLocation() == oat_location) { 925 return oat_file; 926 } 927 } 928 return NULL; 929} 930 931const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location) { 932 ReaderMutexLock mu(Thread::Current(), dex_lock_); 933 return FindOatFileFromOatLocationLocked(oat_location); 934} 935 936const OatFile* ClassLinker::FindOatFileFromOatLocationLocked(const std::string& oat_location) { 937 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 938 if (oat_file != NULL) { 939 return oat_file; 940 } 941 942 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler()); 943 if (oat_file == NULL) { 944 return NULL; 945 } 946 return oat_file; 947} 948 949void ClassLinker::InitFromImage() { 950 VLOG(startup) << "ClassLinker::InitFromImage entering"; 951 CHECK(!init_done_); 952 953 gc::Heap* heap = Runtime::Current()->GetHeap(); 954 gc::space::ImageSpace* space = heap->GetImageSpace(); 955 OatFile* oat_file = OpenOat(space); 956 CHECK(oat_file != NULL) << "Failed to open oat file for image"; 957 CHECK_EQ(oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 958 CHECK_EQ(oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 959 CHECK(oat_file->GetOatHeader().GetImageFileLocation().empty()); 960 portable_resolution_trampoline_ = oat_file->GetOatHeader().GetPortableResolutionTrampoline(); 961 quick_resolution_trampoline_ = oat_file->GetOatHeader().GetQuickResolutionTrampoline(); 962 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 963 mirror::ObjectArray<mirror::DexCache>* dex_caches = 964 dex_caches_object->AsObjectArray<mirror::DexCache>(); 965 966 mirror::ObjectArray<mirror::Class>* class_roots = 967 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>(); 968 class_roots_ = class_roots; 969 970 // Special case of setting up the String class early so that we can test arbitrary objects 971 // as being Strings or not 972 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 973 974 CHECK_EQ(oat_file->GetOatHeader().GetDexFileCount(), 975 static_cast<uint32_t>(dex_caches->GetLength())); 976 Thread* self = Thread::Current(); 977 for (int i = 0; i < dex_caches->GetLength(); i++) { 978 SirtRef<mirror::DexCache> dex_cache(self, dex_caches->Get(i)); 979 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 980 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file_location); 981 CHECK(oat_dex_file != NULL) << oat_file->GetLocation() << " " << dex_file_location; 982 const DexFile* dex_file = oat_dex_file->OpenDexFile(); 983 if (dex_file == NULL) { 984 LOG(FATAL) << "Failed to open dex file " << dex_file_location 985 << " from within oat file " << oat_file->GetLocation(); 986 } 987 988 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 989 990 AppendToBootClassPath(*dex_file, dex_cache); 991 } 992 993 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 994 // bitmap walk. 995 mirror::AbstractMethod::SetClasses(GetClassRoot(kJavaLangReflectConstructor), 996 GetClassRoot(kJavaLangReflectMethod)); 997 998 // reinit clases_ table 999 { 1000 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1001 heap->FlushAllocStack(); 1002 heap->GetLiveBitmap()->Walk(InitFromImageCallback, this); 1003 } 1004 1005 // reinit class_roots_ 1006 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1007 class_roots_ = class_roots; 1008 1009 // reinit array_iftable_ from any array class instance, they should be == 1010 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1011 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1012 // String class root was set above 1013 mirror::Field::SetClass(GetClassRoot(kJavaLangReflectField)); 1014 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1015 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1016 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1017 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1018 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1019 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1020 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1021 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1022 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1023 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1024 1025 FinishInit(); 1026 1027 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1028} 1029 1030void ClassLinker::InitFromImageCallback(mirror::Object* obj, void* arg) { 1031 DCHECK(obj != NULL); 1032 DCHECK(arg != NULL); 1033 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1034 1035 if (obj->GetClass()->IsStringClass()) { 1036 class_linker->intern_table_->RegisterStrong(obj->AsString()); 1037 return; 1038 } 1039 if (obj->IsClass()) { 1040 // restore class to ClassLinker::classes_ table 1041 mirror::Class* klass = obj->AsClass(); 1042 ClassHelper kh(klass, class_linker); 1043 mirror::Class* existing = class_linker->InsertClass(kh.GetDescriptor(), klass, true); 1044 DCHECK(existing == NULL) << kh.GetDescriptor(); 1045 return; 1046 } 1047 1048 // Set entry points to interpreter for methods in interpreter only mode. 1049 if (obj->IsMethod()) { 1050 mirror::AbstractMethod* method = obj->AsMethod(); 1051 if (Runtime::Current()->GetInstrumentation()->InterpretOnly() && !method->IsNative()) { 1052 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterEntry); 1053 if (method != Runtime::Current()->GetResolutionMethod()) { 1054 method->SetEntryPointFromCompiledCode(GetInterpreterEntryPoint()); 1055 } 1056 } 1057 } 1058} 1059 1060// Keep in sync with InitCallback. Anything we visit, we need to 1061// reinit references to when reinitializing a ClassLinker from a 1062// mapped image. 1063void ClassLinker::VisitRoots(RootVisitor* visitor, void* arg, bool clean_dirty) { 1064 visitor(class_roots_, arg); 1065 Thread* self = Thread::Current(); 1066 { 1067 ReaderMutexLock mu(self, dex_lock_); 1068 for (size_t i = 0; i < dex_caches_.size(); i++) { 1069 visitor(dex_caches_[i], arg); 1070 } 1071 } 1072 1073 { 1074 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_); 1075 typedef Table::const_iterator It; // TODO: C++0x auto 1076 for (It it = classes_.begin(), end = classes_.end(); it != end; ++it) { 1077 visitor(it->second, arg); 1078 } 1079 1080 // We deliberately ignore the class roots in the image since we 1081 // handle image roots by using the MS/CMS rescanning of dirty cards. 1082 } 1083 1084 visitor(array_iftable_, arg); 1085 if (clean_dirty) { 1086 is_dirty_ = false; 1087 } 1088} 1089 1090void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) const { 1091 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1092 typedef Table::const_iterator It; // TODO: C++0x auto 1093 for (It it = classes_.begin(), end = classes_.end(); it != end; ++it) { 1094 if (!visitor(it->second, arg)) { 1095 return; 1096 } 1097 } 1098 for (It it = image_classes_.begin(), end = image_classes_.end(); it != end; ++it) { 1099 if (!visitor(it->second, arg)) { 1100 return; 1101 } 1102 } 1103} 1104 1105static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1106 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1107 classes->insert(c); 1108 return true; 1109} 1110 1111void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) const { 1112 std::set<mirror::Class*> classes; 1113 VisitClasses(GetClassesVisitor, &classes); 1114 typedef std::set<mirror::Class*>::const_iterator It; // TODO: C++0x auto 1115 for (It it = classes.begin(), end = classes.end(); it != end; ++it) { 1116 if (!visitor(*it, arg)) { 1117 return; 1118 } 1119 } 1120} 1121 1122 1123ClassLinker::~ClassLinker() { 1124 mirror::Class::ResetClass(); 1125 mirror::String::ResetClass(); 1126 mirror::Field::ResetClass(); 1127 mirror::AbstractMethod::ResetClasses(); 1128 mirror::BooleanArray::ResetArrayClass(); 1129 mirror::ByteArray::ResetArrayClass(); 1130 mirror::CharArray::ResetArrayClass(); 1131 mirror::DoubleArray::ResetArrayClass(); 1132 mirror::FloatArray::ResetArrayClass(); 1133 mirror::IntArray::ResetArrayClass(); 1134 mirror::LongArray::ResetArrayClass(); 1135 mirror::ShortArray::ResetArrayClass(); 1136 mirror::Throwable::ResetClass(); 1137 mirror::StackTraceElement::ResetClass(); 1138 STLDeleteElements(&boot_class_path_); 1139 STLDeleteElements(&oat_files_); 1140} 1141 1142mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1143 gc::Heap* heap = Runtime::Current()->GetHeap(); 1144 mirror::Class* dex_cache_class = GetClassRoot(kJavaLangDexCache); 1145 SirtRef<mirror::DexCache> dex_cache(self, 1146 down_cast<mirror::DexCache*>(heap->AllocObject(self, dex_cache_class, 1147 dex_cache_class->GetObjectSize()))); 1148 if (dex_cache.get() == NULL) { 1149 return NULL; 1150 } 1151 SirtRef<mirror::String> 1152 location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str())); 1153 if (location.get() == NULL) { 1154 return NULL; 1155 } 1156 SirtRef<mirror::ObjectArray<mirror::String> > 1157 strings(self, AllocStringArray(self, dex_file.NumStringIds())); 1158 if (strings.get() == NULL) { 1159 return NULL; 1160 } 1161 SirtRef<mirror::ObjectArray<mirror::Class> > 1162 types(self, AllocClassArray(self, dex_file.NumTypeIds())); 1163 if (types.get() == NULL) { 1164 return NULL; 1165 } 1166 SirtRef<mirror::ObjectArray<mirror::AbstractMethod> > 1167 methods(self, AllocAbstractMethodArray(self, dex_file.NumMethodIds())); 1168 if (methods.get() == NULL) { 1169 return NULL; 1170 } 1171 SirtRef<mirror::ObjectArray<mirror::Field> > 1172 fields(self, AllocFieldArray(self, dex_file.NumFieldIds())); 1173 if (fields.get() == NULL) { 1174 return NULL; 1175 } 1176 SirtRef<mirror::ObjectArray<mirror::StaticStorageBase> > 1177 initialized_static_storage(self, 1178 AllocObjectArray<mirror::StaticStorageBase>(self, dex_file.NumTypeIds())); 1179 if (initialized_static_storage.get() == NULL) { 1180 return NULL; 1181 } 1182 1183 dex_cache->Init(&dex_file, 1184 location.get(), 1185 strings.get(), 1186 types.get(), 1187 methods.get(), 1188 fields.get(), 1189 initialized_static_storage.get()); 1190 return dex_cache.get(); 1191} 1192 1193mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1194 size_t class_size) { 1195 DCHECK_GE(class_size, sizeof(mirror::Class)); 1196 gc::Heap* heap = Runtime::Current()->GetHeap(); 1197 SirtRef<mirror::Class> klass(self, 1198 heap->AllocObject(self, java_lang_Class, class_size)->AsClass()); 1199 klass->SetPrimitiveType(Primitive::kPrimNot); // default to not being primitive 1200 klass->SetClassSize(class_size); 1201 return klass.get(); 1202} 1203 1204mirror::Class* ClassLinker::AllocClass(Thread* self, size_t class_size) { 1205 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1206} 1207 1208mirror::Field* ClassLinker::AllocField(Thread* self) { 1209 return down_cast<mirror::Field*>(GetClassRoot(kJavaLangReflectField)->AllocObject(self)); 1210} 1211 1212mirror::Method* ClassLinker::AllocMethod(Thread* self) { 1213 return down_cast<mirror::Method*>(GetClassRoot(kJavaLangReflectMethod)->AllocObject(self)); 1214} 1215 1216mirror::Constructor* ClassLinker::AllocConstructor(Thread* self) { 1217 return down_cast<mirror::Constructor*>(GetClassRoot(kJavaLangReflectConstructor)->AllocObject(self)); 1218} 1219 1220mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray(Thread* self, 1221 size_t length) { 1222 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc(self, 1223 GetClassRoot(kJavaLangStackTraceElementArrayClass), 1224 length); 1225} 1226 1227static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1228 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1229 DCHECK(klass != NULL); 1230 // Wait for the class if it has not already been linked. 1231 if (!klass->IsResolved() && !klass->IsErroneous()) { 1232 ObjectLock lock(self, klass); 1233 // Check for circular dependencies between classes. 1234 if (!klass->IsResolved() && klass->GetClinitThreadId() == self->GetTid()) { 1235 ThrowClassCircularityError(klass); 1236 klass->SetStatus(mirror::Class::kStatusError); 1237 return NULL; 1238 } 1239 // Wait for the pending initialization to complete. 1240 while (!klass->IsResolved() && !klass->IsErroneous()) { 1241 lock.WaitIgnoringInterrupts(); 1242 } 1243 } 1244 if (klass->IsErroneous()) { 1245 ThrowEarlierClassFailure(klass); 1246 return NULL; 1247 } 1248 // Return the loaded class. No exceptions should be pending. 1249 CHECK(klass->IsResolved()) << PrettyClass(klass); 1250 self->AssertNoPendingException(); 1251 return klass; 1252} 1253 1254mirror::Class* ClassLinker::FindSystemClass(const char* descriptor) { 1255 return FindClass(descriptor, NULL); 1256} 1257 1258mirror::Class* ClassLinker::FindClass(const char* descriptor, mirror::ClassLoader* class_loader) { 1259 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1260 Thread* self = Thread::Current(); 1261 DCHECK(self != NULL); 1262 self->AssertNoPendingException(); 1263 if (descriptor[1] == '\0') { 1264 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1265 // for primitive classes that aren't backed by dex files. 1266 return FindPrimitiveClass(descriptor[0]); 1267 } 1268 // Find the class in the loaded classes table. 1269 mirror::Class* klass = LookupClass(descriptor, class_loader); 1270 if (klass != NULL) { 1271 return EnsureResolved(self, klass); 1272 } 1273 // Class is not yet loaded. 1274 if (descriptor[0] == '[') { 1275 return CreateArrayClass(descriptor, class_loader); 1276 1277 } else if (class_loader == NULL) { 1278 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1279 if (pair.second != NULL) { 1280 return DefineClass(descriptor, NULL, *pair.first, *pair.second); 1281 } 1282 1283 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1284 // first try the boot class path 1285 mirror::Class* system_class = FindSystemClass(descriptor); 1286 if (system_class != NULL) { 1287 return system_class; 1288 } 1289 CHECK(self->IsExceptionPending()); 1290 self->ClearException(); 1291 1292 // next try the compile time class path 1293 const std::vector<const DexFile*>* class_path; 1294 { 1295 ScopedObjectAccessUnchecked soa(Thread::Current()); 1296 ScopedLocalRef<jobject> jclass_loader(soa.Env(), soa.AddLocalReference<jobject>(class_loader)); 1297 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1298 } 1299 1300 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1301 if (pair.second != NULL) { 1302 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1303 } 1304 1305 } else { 1306 ScopedObjectAccessUnchecked soa(self->GetJniEnv()); 1307 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1308 soa.AddLocalReference<jobject>(class_loader)); 1309 std::string class_name_string(DescriptorToDot(descriptor)); 1310 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1311 { 1312 ScopedThreadStateChange tsc(self, kNative); 1313 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1314 soa.Env()->NewStringUTF(class_name_string.c_str())); 1315 if (class_name_object.get() == NULL) { 1316 return NULL; 1317 } 1318 CHECK(class_loader_object.get() != NULL); 1319 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1320 WellKnownClasses::java_lang_ClassLoader_loadClass, 1321 class_name_object.get())); 1322 } 1323 if (soa.Self()->IsExceptionPending()) { 1324 // If the ClassLoader threw, pass that exception up. 1325 return NULL; 1326 } else if (result.get() == NULL) { 1327 // broken loader - throw NPE to be compatible with Dalvik 1328 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1329 class_name_string.c_str()).c_str()); 1330 return NULL; 1331 } else { 1332 // success, return mirror::Class* 1333 return soa.Decode<mirror::Class*>(result.get()); 1334 } 1335 } 1336 1337 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1338 return NULL; 1339} 1340 1341mirror::Class* ClassLinker::DefineClass(const StringPiece& descriptor, 1342 mirror::ClassLoader* class_loader, 1343 const DexFile& dex_file, 1344 const DexFile::ClassDef& dex_class_def) { 1345 Thread* self = Thread::Current(); 1346 SirtRef<mirror::Class> klass(self, NULL); 1347 // Load the class from the dex file. 1348 if (!init_done_) { 1349 // finish up init of hand crafted class_roots_ 1350 if (descriptor == "Ljava/lang/Object;") { 1351 klass.reset(GetClassRoot(kJavaLangObject)); 1352 } else if (descriptor == "Ljava/lang/Class;") { 1353 klass.reset(GetClassRoot(kJavaLangClass)); 1354 } else if (descriptor == "Ljava/lang/String;") { 1355 klass.reset(GetClassRoot(kJavaLangString)); 1356 } else if (descriptor == "Ljava/lang/DexCache;") { 1357 klass.reset(GetClassRoot(kJavaLangDexCache)); 1358 } else if (descriptor == "Ljava/lang/reflect/Field;") { 1359 klass.reset(GetClassRoot(kJavaLangReflectField)); 1360 } else if (descriptor == "Ljava/lang/reflect/AbstractMethod;") { 1361 klass.reset(GetClassRoot(kJavaLangReflectAbstractMethod)); 1362 } else if (descriptor == "Ljava/lang/reflect/Constructor;") { 1363 klass.reset(GetClassRoot(kJavaLangReflectConstructor)); 1364 } else if (descriptor == "Ljava/lang/reflect/Method;") { 1365 klass.reset(GetClassRoot(kJavaLangReflectMethod)); 1366 } else { 1367 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1368 } 1369 } else { 1370 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1371 } 1372 klass->SetDexCache(FindDexCache(dex_file)); 1373 LoadClass(dex_file, dex_class_def, klass, class_loader); 1374 // Check for a pending exception during load 1375 if (self->IsExceptionPending()) { 1376 klass->SetStatus(mirror::Class::kStatusError); 1377 return NULL; 1378 } 1379 ObjectLock lock(self, klass.get()); 1380 klass->SetClinitThreadId(self->GetTid()); 1381 // Add the newly loaded class to the loaded classes table. 1382 SirtRef<mirror::Class> existing(self, InsertClass(descriptor, klass.get(), false)); 1383 if (existing.get() != NULL) { 1384 // We failed to insert because we raced with another thread. 1385 return EnsureResolved(self, existing.get()); 1386 } 1387 // Finish loading (if necessary) by finding parents 1388 CHECK(!klass->IsLoaded()); 1389 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1390 // Loading failed. 1391 klass->SetStatus(mirror::Class::kStatusError); 1392 lock.NotifyAll(); 1393 return NULL; 1394 } 1395 CHECK(klass->IsLoaded()); 1396 // Link the class (if necessary) 1397 CHECK(!klass->IsResolved()); 1398 if (!LinkClass(klass, NULL)) { 1399 // Linking failed. 1400 klass->SetStatus(mirror::Class::kStatusError); 1401 lock.NotifyAll(); 1402 return NULL; 1403 } 1404 CHECK(klass->IsResolved()); 1405 1406 /* 1407 * We send CLASS_PREPARE events to the debugger from here. The 1408 * definition of "preparation" is creating the static fields for a 1409 * class and initializing them to the standard default values, but not 1410 * executing any code (that comes later, during "initialization"). 1411 * 1412 * We did the static preparation in LinkClass. 1413 * 1414 * The class has been prepared and resolved but possibly not yet verified 1415 * at this point. 1416 */ 1417 Dbg::PostClassPrepare(klass.get()); 1418 1419 return klass.get(); 1420} 1421 1422// Precomputes size that will be needed for Class, matching LinkStaticFields 1423size_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1424 const DexFile::ClassDef& dex_class_def) { 1425 const byte* class_data = dex_file.GetClassData(dex_class_def); 1426 size_t num_ref = 0; 1427 size_t num_32 = 0; 1428 size_t num_64 = 0; 1429 if (class_data != NULL) { 1430 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1431 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1432 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1433 char c = descriptor[0]; 1434 if (c == 'L' || c == '[') { 1435 num_ref++; 1436 } else if (c == 'J' || c == 'D') { 1437 num_64++; 1438 } else { 1439 num_32++; 1440 } 1441 } 1442 } 1443 // start with generic class data 1444 size_t size = sizeof(mirror::Class); 1445 // follow with reference fields which must be contiguous at start 1446 size += (num_ref * sizeof(uint32_t)); 1447 // if there are 64-bit fields to add, make sure they are aligned 1448 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1449 if (num_32 != 0) { 1450 // use an available 32-bit field for padding 1451 num_32--; 1452 } 1453 size += sizeof(uint32_t); // either way, we are adding a word 1454 DCHECK_EQ(size, RoundUp(size, 8)); 1455 } 1456 // tack on any 64-bit fields now that alignment is assured 1457 size += (num_64 * sizeof(uint64_t)); 1458 // tack on any remaining 32-bit fields 1459 size += (num_32 * sizeof(uint32_t)); 1460 return size; 1461} 1462 1463const OatFile::OatClass* ClassLinker::GetOatClass(const DexFile& dex_file, const char* descriptor) { 1464 DCHECK(descriptor != NULL); 1465 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1466 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << descriptor; 1467 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation()); 1468 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << descriptor; 1469 uint32_t class_def_index; 1470 bool found = dex_file.FindClassDefIndex(descriptor, class_def_index); 1471 CHECK(found) << dex_file.GetLocation() << " " << descriptor; 1472 const OatFile::OatClass* oat_class = oat_dex_file->GetOatClass(class_def_index); 1473 CHECK(oat_class != NULL) << dex_file.GetLocation() << " " << descriptor; 1474 return oat_class; 1475} 1476 1477static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint32_t method_idx) { 1478 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 1479 const DexFile::TypeId& type_id = dex_file.GetTypeId(method_id.class_idx_); 1480 const DexFile::ClassDef* class_def = dex_file.FindClassDef(dex_file.GetTypeDescriptor(type_id)); 1481 CHECK(class_def != NULL); 1482 const byte* class_data = dex_file.GetClassData(*class_def); 1483 CHECK(class_data != NULL); 1484 ClassDataItemIterator it(dex_file, class_data); 1485 // Skip fields 1486 while (it.HasNextStaticField()) { 1487 it.Next(); 1488 } 1489 while (it.HasNextInstanceField()) { 1490 it.Next(); 1491 } 1492 // Process methods 1493 size_t class_def_method_index = 0; 1494 while (it.HasNextDirectMethod()) { 1495 if (it.GetMemberIndex() == method_idx) { 1496 return class_def_method_index; 1497 } 1498 class_def_method_index++; 1499 it.Next(); 1500 } 1501 while (it.HasNextVirtualMethod()) { 1502 if (it.GetMemberIndex() == method_idx) { 1503 return class_def_method_index; 1504 } 1505 class_def_method_index++; 1506 it.Next(); 1507 } 1508 DCHECK(!it.HasNext()); 1509 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1510 return 0; 1511} 1512 1513const OatFile::OatMethod ClassLinker::GetOatMethodFor(const mirror::AbstractMethod* method) { 1514 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1515 // method for direct methods (or virtual methods made direct). 1516 mirror::Class* declaring_class = method->GetDeclaringClass(); 1517 size_t oat_method_index; 1518 if (method->IsStatic() || method->IsDirect()) { 1519 // Simple case where the oat method index was stashed at load time. 1520 oat_method_index = method->GetMethodIndex(); 1521 } else { 1522 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1523 // by search for its position in the declared virtual methods. 1524 oat_method_index = declaring_class->NumDirectMethods(); 1525 size_t end = declaring_class->NumVirtualMethods(); 1526 bool found = false; 1527 for (size_t i = 0; i < end; i++) { 1528 if (declaring_class->GetVirtualMethod(i) == method) { 1529 found = true; 1530 break; 1531 } 1532 oat_method_index++; 1533 } 1534 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1535 } 1536 ClassHelper kh(declaring_class); 1537 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(kh.GetDexFile(), kh.GetDescriptor())); 1538 CHECK(oat_class.get() != NULL); 1539 DCHECK_EQ(oat_method_index, 1540 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1541 method->GetDexMethodIndex())); 1542 1543 return oat_class->GetOatMethod(oat_method_index); 1544} 1545 1546// Special case to get oat code without overwriting a trampoline. 1547const void* ClassLinker::GetOatCodeFor(const mirror::AbstractMethod* method) { 1548 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1549 const void* result = GetOatMethodFor(method).GetCode(); 1550 if (result == NULL) { 1551 // No code? You must mean to go into the interpreter. 1552 result = GetInterpreterEntryPoint(); 1553 } 1554 return result; 1555} 1556 1557const void* ClassLinker::GetOatCodeFor(const DexFile& dex_file, uint32_t method_idx) { 1558 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 1559 const char* descriptor = dex_file.GetTypeDescriptor(dex_file.GetTypeId(method_id.class_idx_)); 1560 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, method_idx); 1561 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, descriptor)); 1562 CHECK(oat_class.get() != NULL); 1563 return oat_class->GetOatMethod(oat_method_idx).GetCode(); 1564} 1565 1566// Returns true if the method must run with interpreter, false otherwise. 1567static bool NeedsInterpreter(const mirror::AbstractMethod* method, const void* code) { 1568 if (code == NULL) { 1569 // No code: need interpreter. 1570 return true; 1571 } 1572 // If interpreter mode is enabled, every method (except native and proxy) must 1573 // be run with interpreter. 1574 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1575 !method->IsNative() && !method->IsProxyMethod(); 1576} 1577 1578void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1579 ClassHelper kh(klass); 1580 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 1581 CHECK(dex_class_def != NULL); 1582 const DexFile& dex_file = kh.GetDexFile(); 1583 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1584 if (class_data == NULL) { 1585 return; // no fields or methods - for example a marker interface 1586 } 1587 Runtime* runtime = Runtime::Current(); 1588 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1589 // OAT file unavailable 1590 return; 1591 } 1592 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, kh.GetDescriptor())); 1593 CHECK(oat_class.get() != NULL); 1594 ClassDataItemIterator it(dex_file, class_data); 1595 // Skip fields 1596 while (it.HasNextStaticField()) { 1597 it.Next(); 1598 } 1599 while (it.HasNextInstanceField()) { 1600 it.Next(); 1601 } 1602 // Link the code of methods skipped by LinkCode 1603 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1604 mirror::AbstractMethod* method = klass->GetDirectMethod(method_index); 1605 if (!method->IsStatic()) { 1606 // Only update static methods. 1607 continue; 1608 } 1609 const void* code = oat_class->GetOatMethod(method_index).GetCode(); 1610 const bool enter_interpreter = NeedsInterpreter(method, code); 1611 if (enter_interpreter) { 1612 // Use interpreter entry point. 1613 code = GetInterpreterEntryPoint(); 1614 } 1615 runtime->GetInstrumentation()->UpdateMethodsCode(method, code); 1616 } 1617 // Ignore virtual methods on the iterator. 1618} 1619 1620static void LinkCode(SirtRef<mirror::AbstractMethod>& method, const OatFile::OatClass* oat_class, 1621 uint32_t method_index) 1622 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1623 // Method shouldn't have already been linked. 1624 DCHECK(method->GetEntryPointFromCompiledCode() == NULL); 1625 // Every kind of method should at least get an invoke stub from the oat_method. 1626 // non-abstract methods also get their code pointers. 1627 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1628 oat_method.LinkMethod(method.get()); 1629 1630 // Install entry point from interpreter. 1631 Runtime* runtime = Runtime::Current(); 1632 bool enter_interpreter = NeedsInterpreter(method.get(), method->GetEntryPointFromCompiledCode()); 1633 if (enter_interpreter) { 1634 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterEntry); 1635 } else { 1636 method->SetEntryPointFromInterpreter(artInterpreterToQuickEntry); 1637 } 1638 1639 if (method->IsAbstract()) { 1640 method->SetEntryPointFromCompiledCode(GetAbstractMethodErrorStub()); 1641 return; 1642 } 1643 1644 if (method->IsStatic() && !method->IsConstructor()) { 1645 // For static methods excluding the class initializer, install the trampoline. 1646 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1647 // after initializing class (see ClassLinker::InitializeClass method). 1648 method->SetEntryPointFromCompiledCode(GetResolutionTrampoline(runtime->GetClassLinker())); 1649 } else if (enter_interpreter) { 1650 // Set entry point from compiled code if there's no code or in interpreter only mode. 1651 method->SetEntryPointFromCompiledCode(GetInterpreterEntryPoint()); 1652 } 1653 1654 if (method->IsNative()) { 1655 // Unregistering restores the dlsym lookup stub. 1656 method->UnregisterNative(Thread::Current()); 1657 } 1658 1659 // Allow instrumentation its chance to hijack code. 1660 runtime->GetInstrumentation()->UpdateMethodsCode(method.get(), 1661 method->GetEntryPointFromCompiledCode()); 1662} 1663 1664void ClassLinker::LoadClass(const DexFile& dex_file, 1665 const DexFile::ClassDef& dex_class_def, 1666 SirtRef<mirror::Class>& klass, 1667 mirror::ClassLoader* class_loader) { 1668 CHECK(klass.get() != NULL); 1669 CHECK(klass->GetDexCache() != NULL); 1670 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1671 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1672 CHECK(descriptor != NULL); 1673 1674 klass->SetClass(GetClassRoot(kJavaLangClass)); 1675 uint32_t access_flags = dex_class_def.access_flags_; 1676 // Make sure that none of our runtime-only flags are set. 1677 // TODO: JACK CLASS ACCESS (HACK TO BE REMOVED) 1678 CHECK_EQ(access_flags & ~(kAccJavaFlagsMask | kAccClassJack), 0U); 1679 klass->SetAccessFlags(access_flags); 1680 klass->SetClassLoader(class_loader); 1681 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1682 klass->SetStatus(mirror::Class::kStatusIdx); 1683 1684 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1685 1686 // Load fields fields. 1687 const byte* class_data = dex_file.GetClassData(dex_class_def); 1688 if (class_data == NULL) { 1689 return; // no fields or methods - for example a marker interface 1690 } 1691 ClassDataItemIterator it(dex_file, class_data); 1692 Thread* self = Thread::Current(); 1693 if (it.NumStaticFields() != 0) { 1694 klass->SetSFields(AllocFieldArray(self, it.NumStaticFields())); 1695 } 1696 if (it.NumInstanceFields() != 0) { 1697 klass->SetIFields(AllocFieldArray(self, it.NumInstanceFields())); 1698 } 1699 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1700 SirtRef<mirror::Field> sfield(self, AllocField(self)); 1701 klass->SetStaticField(i, sfield.get()); 1702 LoadField(dex_file, it, klass, sfield); 1703 } 1704 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1705 SirtRef<mirror::Field> ifield(self, AllocField(self)); 1706 klass->SetInstanceField(i, ifield.get()); 1707 LoadField(dex_file, it, klass, ifield); 1708 } 1709 1710 UniquePtr<const OatFile::OatClass> oat_class; 1711 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1712 oat_class.reset(GetOatClass(dex_file, descriptor)); 1713 } 1714 1715 // Load methods. 1716 if (it.NumDirectMethods() != 0) { 1717 // TODO: append direct methods to class object 1718 klass->SetDirectMethods(AllocAbstractMethodArray(self, it.NumDirectMethods())); 1719 } 1720 if (it.NumVirtualMethods() != 0) { 1721 // TODO: append direct methods to class object 1722 klass->SetVirtualMethods(AllocMethodArray(self, it.NumVirtualMethods())); 1723 } 1724 size_t class_def_method_index = 0; 1725 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1726 SirtRef<mirror::AbstractMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1727 klass->SetDirectMethod(i, method.get()); 1728 if (oat_class.get() != NULL) { 1729 LinkCode(method, oat_class.get(), class_def_method_index); 1730 } 1731 method->SetMethodIndex(class_def_method_index); 1732 class_def_method_index++; 1733 } 1734 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1735 SirtRef<mirror::AbstractMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1736 klass->SetVirtualMethod(i, method.get()); 1737 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1738 if (oat_class.get() != NULL) { 1739 LinkCode(method, oat_class.get(), class_def_method_index); 1740 } 1741 class_def_method_index++; 1742 } 1743 DCHECK(!it.HasNext()); 1744} 1745 1746void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1747 SirtRef<mirror::Class>& klass, SirtRef<mirror::Field>& dst) { 1748 uint32_t field_idx = it.GetMemberIndex(); 1749 dst->SetDexFieldIndex(field_idx); 1750 dst->SetDeclaringClass(klass.get()); 1751 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1752} 1753 1754mirror::AbstractMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1755 const ClassDataItemIterator& it, 1756 SirtRef<mirror::Class>& klass) { 1757 uint32_t dex_method_idx = it.GetMemberIndex(); 1758 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1759 StringPiece method_name(dex_file.GetMethodName(method_id)); 1760 1761 mirror::AbstractMethod* dst = NULL; 1762 if (method_name == "<init>") { 1763 dst = AllocConstructor(self); 1764 } else { 1765 dst = AllocMethod(self); 1766 } 1767 DCHECK(dst->IsMethod()) << PrettyDescriptor(dst->GetClass()); 1768 1769 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 1770 dst->SetDexMethodIndex(dex_method_idx); 1771 dst->SetDeclaringClass(klass.get()); 1772 1773 if (method_name == "finalize") { 1774 // Create the prototype for a signature of "()V" 1775 const DexFile::StringId* void_string_id = dex_file.FindStringId("V"); 1776 if (void_string_id != NULL) { 1777 const DexFile::TypeId* void_type_id = 1778 dex_file.FindTypeId(dex_file.GetIndexForStringId(*void_string_id)); 1779 if (void_type_id != NULL) { 1780 std::vector<uint16_t> no_args; 1781 const DexFile::ProtoId* finalizer_proto = 1782 dex_file.FindProtoId(dex_file.GetIndexForTypeId(*void_type_id), no_args); 1783 if (finalizer_proto != NULL) { 1784 // We have the prototype in the dex file 1785 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 1786 klass->SetFinalizable(); 1787 } else { 1788 StringPiece klass_descriptor(dex_file.StringByTypeIdx(klass->GetDexTypeIndex())); 1789 // The Enum class declares a "final" finalize() method to prevent subclasses from 1790 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 1791 // subclasses, so we exclude it here. 1792 // We also want to avoid setting the flag on Object, where we know that finalize() is 1793 // empty. 1794 if (klass_descriptor != "Ljava/lang/Object;" && 1795 klass_descriptor != "Ljava/lang/Enum;") { 1796 klass->SetFinalizable(); 1797 } 1798 } 1799 } 1800 } 1801 } 1802 } 1803 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 1804 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1805 1806 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 1807 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 1808 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 1809 dst->SetDexCacheInitializedStaticStorage(klass->GetDexCache()->GetInitializedStaticStorage()); 1810 1811 CHECK(dst->IsMethod()); 1812 1813 self->EndAssertNoThreadSuspension(old_cause); 1814 return dst; 1815} 1816 1817void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 1818 Thread* self = Thread::Current(); 1819 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1820 AppendToBootClassPath(dex_file, dex_cache); 1821} 1822 1823void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1824 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1825 boot_class_path_.push_back(&dex_file); 1826 RegisterDexFile(dex_file, dex_cache); 1827} 1828 1829bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 1830 dex_lock_.AssertSharedHeld(Thread::Current()); 1831 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1832 if (dex_caches_[i]->GetDexFile() == &dex_file) { 1833 return true; 1834 } 1835 } 1836 return false; 1837} 1838 1839bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 1840 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1841 return IsDexFileRegisteredLocked(dex_file); 1842} 1843 1844void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1845 dex_lock_.AssertExclusiveHeld(Thread::Current()); 1846 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1847 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())); 1848 dex_caches_.push_back(dex_cache.get()); 1849 dex_cache->SetDexFile(&dex_file); 1850 Dirty(); 1851} 1852 1853void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 1854 Thread* self = Thread::Current(); 1855 { 1856 ReaderMutexLock mu(self, dex_lock_); 1857 if (IsDexFileRegisteredLocked(dex_file)) { 1858 return; 1859 } 1860 } 1861 // Don't alloc while holding the lock, since allocation may need to 1862 // suspend all threads and another thread may need the dex_lock_ to 1863 // get to a suspend point. 1864 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1865 { 1866 WriterMutexLock mu(self, dex_lock_); 1867 if (IsDexFileRegisteredLocked(dex_file)) { 1868 return; 1869 } 1870 RegisterDexFileLocked(dex_file, dex_cache); 1871 } 1872} 1873 1874void ClassLinker::RegisterDexFile(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) { 1875 WriterMutexLock mu(Thread::Current(), dex_lock_); 1876 RegisterDexFileLocked(dex_file, dex_cache); 1877} 1878 1879mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 1880 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1881 // Search assuming unique-ness of dex file. 1882 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1883 mirror::DexCache* dex_cache = dex_caches_[i]; 1884 if (dex_cache->GetDexFile() == &dex_file) { 1885 return dex_cache; 1886 } 1887 } 1888 // Search matching by location name. 1889 std::string location(dex_file.GetLocation()); 1890 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1891 mirror::DexCache* dex_cache = dex_caches_[i]; 1892 if (dex_cache->GetDexFile()->GetLocation() == location) { 1893 return dex_cache; 1894 } 1895 } 1896 // Failure, dump diagnostic and abort. 1897 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1898 mirror::DexCache* dex_cache = dex_caches_[i]; 1899 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 1900 } 1901 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 1902 return NULL; 1903} 1904 1905void ClassLinker::FixupDexCaches(mirror::AbstractMethod* resolution_method) const { 1906 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1907 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1908 dex_caches_[i]->Fixup(resolution_method); 1909 } 1910} 1911 1912mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 1913 return InitializePrimitiveClass(AllocClass(self, sizeof(mirror::Class)), type); 1914} 1915 1916mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, Primitive::Type type) { 1917 CHECK(primitive_class != NULL); 1918 // Must hold lock on object when initializing. 1919 ObjectLock lock(Thread::Current(), primitive_class); 1920 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 1921 primitive_class->SetPrimitiveType(type); 1922 primitive_class->SetStatus(mirror::Class::kStatusInitialized); 1923 mirror::Class* existing = InsertClass(Primitive::Descriptor(type), primitive_class, false); 1924 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 1925 return primitive_class; 1926} 1927 1928// Create an array class (i.e. the class object for the array, not the 1929// array itself). "descriptor" looks like "[C" or "[[[[B" or 1930// "[Ljava/lang/String;". 1931// 1932// If "descriptor" refers to an array of primitives, look up the 1933// primitive type's internally-generated class object. 1934// 1935// "class_loader" is the class loader of the class that's referring to 1936// us. It's used to ensure that we're looking for the element type in 1937// the right context. It does NOT become the class loader for the 1938// array class; that always comes from the base element class. 1939// 1940// Returns NULL with an exception raised on failure. 1941mirror::Class* ClassLinker::CreateArrayClass(const std::string& descriptor, 1942 mirror::ClassLoader* class_loader) { 1943 CHECK_EQ('[', descriptor[0]); 1944 1945 // Identify the underlying component type 1946 mirror::Class* component_type = FindClass(descriptor.substr(1).c_str(), class_loader); 1947 if (component_type == NULL) { 1948 DCHECK(Thread::Current()->IsExceptionPending()); 1949 return NULL; 1950 } 1951 1952 // See if the component type is already loaded. Array classes are 1953 // always associated with the class loader of their underlying 1954 // element type -- an array of Strings goes with the loader for 1955 // java/lang/String -- so we need to look for it there. (The 1956 // caller should have checked for the existence of the class 1957 // before calling here, but they did so with *their* class loader, 1958 // not the component type's loader.) 1959 // 1960 // If we find it, the caller adds "loader" to the class' initiating 1961 // loader list, which should prevent us from going through this again. 1962 // 1963 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 1964 // are the same, because our caller (FindClass) just did the 1965 // lookup. (Even if we get this wrong we still have correct behavior, 1966 // because we effectively do this lookup again when we add the new 1967 // class to the hash table --- necessary because of possible races with 1968 // other threads.) 1969 if (class_loader != component_type->GetClassLoader()) { 1970 mirror::Class* new_class = LookupClass(descriptor.c_str(), component_type->GetClassLoader()); 1971 if (new_class != NULL) { 1972 return new_class; 1973 } 1974 } 1975 1976 // Fill out the fields in the Class. 1977 // 1978 // It is possible to execute some methods against arrays, because 1979 // all arrays are subclasses of java_lang_Object_, so we need to set 1980 // up a vtable. We can just point at the one in java_lang_Object_. 1981 // 1982 // Array classes are simple enough that we don't need to do a full 1983 // link step. 1984 Thread* self = Thread::Current(); 1985 SirtRef<mirror::Class> new_class(self, NULL); 1986 if (!init_done_) { 1987 // Classes that were hand created, ie not by FindSystemClass 1988 if (descriptor == "[Ljava/lang/Class;") { 1989 new_class.reset(GetClassRoot(kClassArrayClass)); 1990 } else if (descriptor == "[Ljava/lang/Object;") { 1991 new_class.reset(GetClassRoot(kObjectArrayClass)); 1992 } else if (descriptor == class_roots_descriptors_[kJavaLangStringArrayClass]) { 1993 new_class.reset(GetClassRoot(kJavaLangStringArrayClass)); 1994 } else if (descriptor == class_roots_descriptors_[kJavaLangReflectAbstractMethodArrayClass]) { 1995 new_class.reset(GetClassRoot(kJavaLangReflectAbstractMethodArrayClass)); 1996 } else if (descriptor == class_roots_descriptors_[kJavaLangReflectFieldArrayClass]) { 1997 new_class.reset(GetClassRoot(kJavaLangReflectFieldArrayClass)); 1998 } else if (descriptor == class_roots_descriptors_[kJavaLangReflectMethodArrayClass]) { 1999 new_class.reset(GetClassRoot(kJavaLangReflectMethodArrayClass)); 2000 } else if (descriptor == "[C") { 2001 new_class.reset(GetClassRoot(kCharArrayClass)); 2002 } else if (descriptor == "[I") { 2003 new_class.reset(GetClassRoot(kIntArrayClass)); 2004 } 2005 } 2006 if (new_class.get() == NULL) { 2007 new_class.reset(AllocClass(self, sizeof(mirror::Class))); 2008 if (new_class.get() == NULL) { 2009 return NULL; 2010 } 2011 new_class->SetComponentType(component_type); 2012 } 2013 ObjectLock lock(self, new_class.get()); // Must hold lock on object when initializing. 2014 DCHECK(new_class->GetComponentType() != NULL); 2015 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2016 new_class->SetSuperClass(java_lang_Object); 2017 new_class->SetVTable(java_lang_Object->GetVTable()); 2018 new_class->SetPrimitiveType(Primitive::kPrimNot); 2019 new_class->SetClassLoader(component_type->GetClassLoader()); 2020 new_class->SetStatus(mirror::Class::kStatusInitialized); 2021 // don't need to set new_class->SetObjectSize(..) 2022 // because Object::SizeOf delegates to Array::SizeOf 2023 2024 2025 // All arrays have java/lang/Cloneable and java/io/Serializable as 2026 // interfaces. We need to set that up here, so that stuff like 2027 // "instanceof" works right. 2028 // 2029 // Note: The GC could run during the call to FindSystemClass, 2030 // so we need to make sure the class object is GC-valid while we're in 2031 // there. Do this by clearing the interface list so the GC will just 2032 // think that the entries are null. 2033 2034 2035 // Use the single, global copies of "interfaces" and "iftable" 2036 // (remember not to free them for arrays). 2037 CHECK(array_iftable_ != NULL); 2038 new_class->SetIfTable(array_iftable_); 2039 2040 // Inherit access flags from the component type. 2041 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2042 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2043 access_flags &= kAccJavaFlagsMask; 2044 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2045 // and remove "interface". 2046 access_flags |= kAccAbstract | kAccFinal; 2047 access_flags &= ~kAccInterface; 2048 2049 new_class->SetAccessFlags(access_flags); 2050 2051 mirror::Class* existing = InsertClass(descriptor, new_class.get(), false); 2052 if (existing == NULL) { 2053 return new_class.get(); 2054 } 2055 // Another thread must have loaded the class after we 2056 // started but before we finished. Abandon what we've 2057 // done. 2058 // 2059 // (Yes, this happens.) 2060 2061 return existing; 2062} 2063 2064mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2065 switch (Primitive::GetType(type)) { 2066 case Primitive::kPrimByte: 2067 return GetClassRoot(kPrimitiveByte); 2068 case Primitive::kPrimChar: 2069 return GetClassRoot(kPrimitiveChar); 2070 case Primitive::kPrimDouble: 2071 return GetClassRoot(kPrimitiveDouble); 2072 case Primitive::kPrimFloat: 2073 return GetClassRoot(kPrimitiveFloat); 2074 case Primitive::kPrimInt: 2075 return GetClassRoot(kPrimitiveInt); 2076 case Primitive::kPrimLong: 2077 return GetClassRoot(kPrimitiveLong); 2078 case Primitive::kPrimShort: 2079 return GetClassRoot(kPrimitiveShort); 2080 case Primitive::kPrimBoolean: 2081 return GetClassRoot(kPrimitiveBoolean); 2082 case Primitive::kPrimVoid: 2083 return GetClassRoot(kPrimitiveVoid); 2084 case Primitive::kPrimNot: 2085 break; 2086 } 2087 std::string printable_type(PrintableChar(type)); 2088 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2089 return NULL; 2090} 2091 2092mirror::Class* ClassLinker::InsertClass(const StringPiece& descriptor, mirror::Class* klass, 2093 bool image_class) { 2094 if (VLOG_IS_ON(class_linker)) { 2095 mirror::DexCache* dex_cache = klass->GetDexCache(); 2096 std::string source; 2097 if (dex_cache != NULL) { 2098 source += " from "; 2099 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2100 } 2101 LOG(INFO) << "Loaded class " << descriptor << source; 2102 } 2103 size_t hash = StringPieceHash()(descriptor); 2104 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2105 Table& classes = image_class ? image_classes_ : classes_; 2106 mirror::Class* existing = 2107 LookupClassLocked(descriptor.data(), klass->GetClassLoader(), hash, classes); 2108#ifndef NDEBUG 2109 // Check we don't have the class in the other table in error 2110 Table& other_classes = image_class ? classes_ : image_classes_; 2111 CHECK(LookupClassLocked(descriptor.data(), klass->GetClassLoader(), hash, other_classes) == NULL); 2112#endif 2113 if (existing != NULL) { 2114 return existing; 2115 } 2116 Runtime::Current()->GetHeap()->VerifyObject(klass); 2117 classes.insert(std::make_pair(hash, klass)); 2118 Dirty(); 2119 return NULL; 2120} 2121 2122bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2123 size_t hash = Hash(descriptor); 2124 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2125 typedef Table::iterator It; // TODO: C++0x auto 2126 // TODO: determine if its better to search classes_ or image_classes_ first 2127 ClassHelper kh; 2128 for (It it = classes_.lower_bound(hash), end = classes_.end(); it != end && it->first == hash; 2129 ++it) { 2130 mirror::Class* klass = it->second; 2131 kh.ChangeClass(klass); 2132 if (strcmp(kh.GetDescriptor(), descriptor) == 0 && klass->GetClassLoader() == class_loader) { 2133 classes_.erase(it); 2134 return true; 2135 } 2136 } 2137 for (It it = image_classes_.lower_bound(hash), end = classes_.end(); 2138 it != end && it->first == hash; ++it) { 2139 mirror::Class* klass = it->second; 2140 kh.ChangeClass(klass); 2141 if (strcmp(kh.GetDescriptor(), descriptor) == 0 && klass->GetClassLoader() == class_loader) { 2142 image_classes_.erase(it); 2143 return true; 2144 } 2145 } 2146 return false; 2147} 2148 2149mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2150 const mirror::ClassLoader* class_loader) { 2151 size_t hash = Hash(descriptor); 2152 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2153 // TODO: determine if its better to search classes_ or image_classes_ first 2154 mirror::Class* klass = NULL; 2155 // Use image class only if the class_loader is null. 2156 if (class_loader == NULL) { 2157 klass = LookupClassLocked(descriptor, class_loader, hash, image_classes_); 2158 } 2159 if (klass != NULL) { 2160 return klass; 2161 } 2162 return LookupClassLocked(descriptor, class_loader, hash, classes_); 2163} 2164 2165mirror::Class* ClassLinker::LookupClassLocked(const char* descriptor, 2166 const mirror::ClassLoader* class_loader, 2167 size_t hash, const Table& classes) { 2168 ClassHelper kh(NULL, this); 2169 typedef Table::const_iterator It; // TODO: C++0x auto 2170 for (It it = classes.lower_bound(hash), end = classes_.end(); it != end && it->first == hash; ++it) { 2171 mirror::Class* klass = it->second; 2172 kh.ChangeClass(klass); 2173 if (strcmp(descriptor, kh.GetDescriptor()) == 0 && klass->GetClassLoader() == class_loader) { 2174#ifndef NDEBUG 2175 for (++it; it != end && it->first == hash; ++it) { 2176 mirror::Class* klass2 = it->second; 2177 kh.ChangeClass(klass2); 2178 CHECK(!(strcmp(descriptor, kh.GetDescriptor()) == 0 && klass2->GetClassLoader() == class_loader)) 2179 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2180 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2181 } 2182#endif 2183 return klass; 2184 } 2185 } 2186 return NULL; 2187} 2188 2189void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& classes) { 2190 classes.clear(); 2191 size_t hash = Hash(descriptor); 2192 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2193 typedef Table::const_iterator It; // TODO: C++0x auto 2194 // TODO: determine if its better to search classes_ or image_classes_ first 2195 ClassHelper kh(NULL, this); 2196 for (It it = classes_.lower_bound(hash), end = classes_.end(); it != end && it->first == hash; ++it) { 2197 mirror::Class* klass = it->second; 2198 kh.ChangeClass(klass); 2199 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2200 classes.push_back(klass); 2201 } 2202 } 2203 for (It it = image_classes_.lower_bound(hash), end = classes_.end(); it != end && it->first == hash; ++it) { 2204 mirror::Class* klass = it->second; 2205 kh.ChangeClass(klass); 2206 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2207 classes.push_back(klass); 2208 } 2209 } 2210} 2211 2212void ClassLinker::VerifyClass(mirror::Class* klass) { 2213 // TODO: assert that the monitor on the Class is held 2214 Thread* self = Thread::Current(); 2215 ObjectLock lock(self, klass); 2216 2217 // Don't attempt to re-verify if already sufficiently verified. 2218 if (klass->IsVerified() || 2219 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2220 return; 2221 } 2222 2223 // The class might already be erroneous, for example at compile time if we attempted to verify 2224 // this class as a parent to another. 2225 if (klass->IsErroneous()) { 2226 ThrowEarlierClassFailure(klass); 2227 return; 2228 } 2229 2230 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2231 klass->SetStatus(mirror::Class::kStatusVerifying); 2232 } else { 2233 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2234 << PrettyClass(klass); 2235 CHECK(!Runtime::Current()->IsCompiler()); 2236 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime); 2237 } 2238 2239 // Verify super class. 2240 mirror::Class* super = klass->GetSuperClass(); 2241 if (super != NULL) { 2242 // Acquire lock to prevent races on verifying the super class. 2243 ObjectLock lock(self, super); 2244 2245 if (!super->IsVerified() && !super->IsErroneous()) { 2246 Runtime::Current()->GetClassLinker()->VerifyClass(super); 2247 } 2248 if (!super->IsCompileTimeVerified()) { 2249 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2250 PrettyDescriptor(klass).c_str(), 2251 PrettyDescriptor(super).c_str())); 2252 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2253 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 2254 if (cause.get() != NULL) { 2255 self->ClearException(); 2256 } 2257 ThrowVerifyError(klass, "%s", error_msg.c_str()); 2258 if (cause.get() != NULL) { 2259 self->GetException(NULL)->SetCause(cause.get()); 2260 } 2261 klass->SetStatus(mirror::Class::kStatusError); 2262 return; 2263 } 2264 } 2265 2266 // Try to use verification information from the oat file, otherwise do runtime verification. 2267 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2268 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2269 bool preverified = VerifyClassUsingOatFile(dex_file, klass, oat_file_class_status); 2270 if (oat_file_class_status == mirror::Class::kStatusError) { 2271 LOG(WARNING) << "Skipping runtime verification of erroneous class " << PrettyDescriptor(klass) 2272 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2273 ThrowVerifyError(klass, "Rejecting class %s because it failed compile-time verification", 2274 PrettyDescriptor(klass).c_str()); 2275 klass->SetStatus(mirror::Class::kStatusError); 2276 return; 2277 } 2278 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2279 std::string error_msg; 2280 if (!preverified) { 2281 verifier_failure = verifier::MethodVerifier::VerifyClass(klass, error_msg, 2282 Runtime::Current()->IsCompiler()); 2283 } 2284 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2285 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2286 LOG(WARNING) << "Soft verification failure in class " << PrettyDescriptor(klass) 2287 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2288 << " because: " << error_msg; 2289 } 2290 self->AssertNoPendingException(); 2291 // Make sure all classes referenced by catch blocks are resolved. 2292 ResolveClassExceptionHandlerTypes(dex_file, klass); 2293 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2294 klass->SetStatus(mirror::Class::kStatusVerified); 2295 } else { 2296 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2297 // Soft failures at compile time should be retried at runtime. Soft 2298 // failures at runtime will be handled by slow paths in the generated 2299 // code. Set status accordingly. 2300 if (Runtime::Current()->IsCompiler()) { 2301 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime); 2302 } else { 2303 klass->SetStatus(mirror::Class::kStatusVerified); 2304 } 2305 } 2306 } else { 2307 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass) 2308 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2309 << " because: " << error_msg; 2310 self->AssertNoPendingException(); 2311 ThrowVerifyError(klass, "%s", error_msg.c_str()); 2312 klass->SetStatus(mirror::Class::kStatusError); 2313 } 2314 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2315 // Class is verified so we don't need to do any access check in its methods. 2316 // Let the interpreter know it by setting the kAccPreverified flag onto each 2317 // method. 2318 // Note: we're going here during compilation and at runtime. When we set the 2319 // kAccPreverified flag when compiling image classes, the flag is recorded 2320 // in the image and is set when loading the image. 2321 klass->SetPreverifiedFlagOnAllMethods(); 2322 } 2323} 2324 2325bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2326 mirror::Class::Status& oat_file_class_status) { 2327 if (!Runtime::Current()->IsStarted()) { 2328 return false; 2329 } 2330 if (Runtime::Current()->UseCompileTimeClassPath()) { 2331 return false; 2332 } 2333 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2334 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2335 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation()); 2336 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2337 const char* descriptor = ClassHelper(klass).GetDescriptor(); 2338 uint32_t class_def_index; 2339 bool found = dex_file.FindClassDefIndex(descriptor, class_def_index); 2340 CHECK(found) << dex_file.GetLocation() << " " << PrettyClass(klass) << " " << descriptor; 2341 UniquePtr<const OatFile::OatClass> oat_class(oat_dex_file->GetOatClass(class_def_index)); 2342 CHECK(oat_class.get() != NULL) 2343 << dex_file.GetLocation() << " " << PrettyClass(klass) << " " << descriptor; 2344 oat_file_class_status = oat_class->GetStatus(); 2345 if (oat_file_class_status == mirror::Class::kStatusVerified || 2346 oat_file_class_status == mirror::Class::kStatusInitialized) { 2347 return true; 2348 } 2349 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2350 // Compile time verification failed with a soft error. Compile time verification can fail 2351 // because we have incomplete type information. Consider the following: 2352 // class ... { 2353 // Foo x; 2354 // .... () { 2355 // if (...) { 2356 // v1 gets assigned a type of resolved class Foo 2357 // } else { 2358 // v1 gets assigned a type of unresolved class Bar 2359 // } 2360 // iput x = v1 2361 // } } 2362 // when we merge v1 following the if-the-else it results in Conflict 2363 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2364 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2365 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2366 // at compile time). 2367 return false; 2368 } 2369 if (oat_file_class_status == mirror::Class::kStatusError) { 2370 // Compile time verification failed with a hard error. This is caused by invalid instructions 2371 // in the class. These errors are unrecoverable. 2372 return false; 2373 } 2374 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2375 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2376 // not loading the class. 2377 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2378 // isn't a problem and this case shouldn't occur 2379 return false; 2380 } 2381 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2382 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " << descriptor; 2383 2384 return false; 2385} 2386 2387void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, mirror::Class* klass) { 2388 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2389 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2390 } 2391 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2392 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2393 } 2394} 2395 2396void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2397 mirror::AbstractMethod* method) { 2398 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2399 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2400 if (code_item == NULL) { 2401 return; // native or abstract method 2402 } 2403 if (code_item->tries_size_ == 0) { 2404 return; // nothing to process 2405 } 2406 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2407 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2408 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2409 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2410 CatchHandlerIterator iterator(handlers_ptr); 2411 for (; iterator.HasNext(); iterator.Next()) { 2412 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2413 // unresolved exception types will be ignored by exception delivery 2414 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2415 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2416 if (exception_type == NULL) { 2417 DCHECK(Thread::Current()->IsExceptionPending()); 2418 Thread::Current()->ClearException(); 2419 } 2420 } 2421 } 2422 handlers_ptr = iterator.EndDataPointer(); 2423 } 2424} 2425 2426static void CheckProxyConstructor(mirror::AbstractMethod* constructor); 2427static void CheckProxyMethod(mirror::AbstractMethod* method, 2428 SirtRef<mirror::AbstractMethod>& prototype); 2429 2430mirror::Class* ClassLinker::CreateProxyClass(mirror::String* name, 2431 mirror::ObjectArray<mirror::Class>* interfaces, 2432 mirror::ClassLoader* loader, 2433 mirror::ObjectArray<mirror::AbstractMethod>* methods, 2434 mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >* throws) { 2435 Thread* self = Thread::Current(); 2436 SirtRef<mirror::Class> klass(self, AllocClass(self, GetClassRoot(kJavaLangClass), 2437 sizeof(mirror::SynthesizedProxyClass))); 2438 CHECK(klass.get() != NULL); 2439 DCHECK(klass->GetClass() != NULL); 2440 klass->SetObjectSize(sizeof(mirror::Proxy)); 2441 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2442 klass->SetClassLoader(loader); 2443 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2444 klass->SetName(name); 2445 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2446 klass->SetDexCache(proxy_class->GetDexCache()); 2447 2448 klass->SetStatus(mirror::Class::kStatusIdx); 2449 2450 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); 2451 2452 // Instance fields are inherited, but we add a couple of static fields... 2453 klass->SetSFields(AllocFieldArray(self, 2)); 2454 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2455 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2456 SirtRef<mirror::Field> interfaces_sfield(self, AllocField(self)); 2457 klass->SetStaticField(0, interfaces_sfield.get()); 2458 interfaces_sfield->SetDexFieldIndex(0); 2459 interfaces_sfield->SetDeclaringClass(klass.get()); 2460 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2461 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2462 SirtRef<mirror::Field> throws_sfield(self, AllocField(self)); 2463 klass->SetStaticField(1, throws_sfield.get()); 2464 throws_sfield->SetDexFieldIndex(1); 2465 throws_sfield->SetDeclaringClass(klass.get()); 2466 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2467 2468 // Proxies have 1 direct method, the constructor 2469 klass->SetDirectMethods(AllocAbstractMethodArray(self, 1)); 2470 klass->SetDirectMethod(0, CreateProxyConstructor(self, klass, proxy_class)); 2471 2472 // Create virtual method using specified prototypes 2473 size_t num_virtual_methods = methods->GetLength(); 2474 klass->SetVirtualMethods(AllocMethodArray(self, num_virtual_methods)); 2475 for (size_t i = 0; i < num_virtual_methods; ++i) { 2476 SirtRef<mirror::AbstractMethod> prototype(self, methods->Get(i)); 2477 klass->SetVirtualMethod(i, CreateProxyMethod(self, klass, prototype)); 2478 } 2479 2480 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2481 klass->SetStatus(mirror::Class::kStatusLoaded); // Class is now effectively in the loaded state 2482 self->AssertNoPendingException(); 2483 2484 // Link the fields and virtual methods, creating vtable and iftables 2485 if (!LinkClass(klass, interfaces)) { 2486 klass->SetStatus(mirror::Class::kStatusError); 2487 return NULL; 2488 } 2489 { 2490 ObjectLock lock(self, klass.get()); // Must hold lock on object when initializing. 2491 interfaces_sfield->SetObject(klass.get(), interfaces); 2492 throws_sfield->SetObject(klass.get(), throws); 2493 klass->SetStatus(mirror::Class::kStatusInitialized); 2494 } 2495 2496 // sanity checks 2497 if (kIsDebugBuild) { 2498 CHECK(klass->GetIFields() == NULL); 2499 CheckProxyConstructor(klass->GetDirectMethod(0)); 2500 for (size_t i = 0; i < num_virtual_methods; ++i) { 2501 SirtRef<mirror::AbstractMethod> prototype(self, methods->Get(i)); 2502 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2503 } 2504 2505 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2506 name->ToModifiedUtf8().c_str())); 2507 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2508 2509 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2510 name->ToModifiedUtf8().c_str())); 2511 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2512 2513 mirror::SynthesizedProxyClass* synth_proxy_class = 2514 down_cast<mirror::SynthesizedProxyClass*>(klass.get()); 2515 CHECK_EQ(synth_proxy_class->GetInterfaces(), interfaces); 2516 CHECK_EQ(synth_proxy_class->GetThrows(), throws); 2517 } 2518 return klass.get(); 2519} 2520 2521std::string ClassLinker::GetDescriptorForProxy(const mirror::Class* proxy_class) { 2522 DCHECK(proxy_class->IsProxyClass()); 2523 mirror::String* name = proxy_class->GetName(); 2524 DCHECK(name != NULL); 2525 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2526} 2527 2528mirror::AbstractMethod* ClassLinker::FindMethodForProxy(const mirror::Class* proxy_class, 2529 const mirror::AbstractMethod* proxy_method) { 2530 DCHECK(proxy_class->IsProxyClass()); 2531 DCHECK(proxy_method->IsProxyMethod()); 2532 // Locate the dex cache of the original interface/Object 2533 mirror::DexCache* dex_cache = NULL; 2534 { 2535 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2536 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2537 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2538 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2539 dex_cache = dex_caches_[i]; 2540 break; 2541 } 2542 } 2543 } 2544 CHECK(dex_cache != NULL); 2545 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2546 mirror::AbstractMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2547 CHECK(resolved_method != NULL); 2548 return resolved_method; 2549} 2550 2551 2552mirror::AbstractMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2553 SirtRef<mirror::Class>& klass, 2554 mirror::Class* proxy_class) { 2555 // Create constructor for Proxy that must initialize h 2556 mirror::ObjectArray<mirror::AbstractMethod>* proxy_direct_methods = 2557 proxy_class->GetDirectMethods(); 2558 CHECK_EQ(proxy_direct_methods->GetLength(), 15); 2559 mirror::AbstractMethod* proxy_constructor = proxy_direct_methods->Get(2); 2560 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2561 // code_ too) 2562 mirror::AbstractMethod* constructor = 2563 down_cast<mirror::AbstractMethod*>(proxy_constructor->Clone(self)); 2564 // Make this constructor public and fix the class to be our Proxy version 2565 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2566 constructor->SetDeclaringClass(klass.get()); 2567 return constructor; 2568} 2569 2570static void CheckProxyConstructor(mirror::AbstractMethod* constructor) 2571 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2572 CHECK(constructor->IsConstructor()); 2573 MethodHelper mh(constructor); 2574 CHECK_STREQ(mh.GetName(), "<init>"); 2575 CHECK_EQ(mh.GetSignature(), std::string("(Ljava/lang/reflect/InvocationHandler;)V")); 2576 DCHECK(constructor->IsPublic()); 2577} 2578 2579mirror::AbstractMethod* ClassLinker::CreateProxyMethod(Thread* self, SirtRef<mirror::Class>& klass, 2580 SirtRef<mirror::AbstractMethod>& prototype) { 2581 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2582 // prototype method 2583 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2584 prototype.get()); 2585 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2586 // as necessary 2587 mirror::AbstractMethod* method = down_cast<mirror::AbstractMethod*>(prototype->Clone(self)); 2588 2589 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 2590 // the intersection of throw exceptions as defined in Proxy 2591 method->SetDeclaringClass(klass.get()); 2592 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 2593 2594 // At runtime the method looks like a reference and argument saving method, clone the code 2595 // related parameters from this method. 2596 mirror::AbstractMethod* refs_and_args = 2597 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 2598 method->SetCoreSpillMask(refs_and_args->GetCoreSpillMask()); 2599 method->SetFpSpillMask(refs_and_args->GetFpSpillMask()); 2600 method->SetFrameSizeInBytes(refs_and_args->GetFrameSizeInBytes()); 2601#if !defined(ART_USE_PORTABLE_COMPILER) 2602 method->SetEntryPointFromCompiledCode(reinterpret_cast<void*>(art_quick_proxy_invoke_handler)); 2603#else 2604 method->SetEntryPointFromCompiledCode(reinterpret_cast<void*>(art_portable_proxy_invoke_handler)); 2605#endif 2606 method->SetEntryPointFromInterpreter(artInterpreterToQuickEntry); 2607 2608 return method; 2609} 2610 2611static void CheckProxyMethod(mirror::AbstractMethod* method, 2612 SirtRef<mirror::AbstractMethod>& prototype) 2613 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2614 // Basic sanity 2615 CHECK(!prototype->IsFinal()); 2616 CHECK(method->IsFinal()); 2617 CHECK(!method->IsAbstract()); 2618 2619 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 2620 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 2621 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 2622 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 2623 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 2624 CHECK_EQ(prototype->GetDexCacheInitializedStaticStorage(), 2625 method->GetDexCacheInitializedStaticStorage()); 2626 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 2627 2628 MethodHelper mh(method); 2629 MethodHelper mh2(prototype.get()); 2630 CHECK_STREQ(mh.GetName(), mh2.GetName()); 2631 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 2632 // More complex sanity - via dex cache 2633 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 2634} 2635 2636bool ClassLinker::InitializeClass(mirror::Class* klass, bool can_run_clinit, bool can_init_statics) { 2637 CHECK(klass->IsResolved() || klass->IsErroneous()) 2638 << PrettyClass(klass) << ": state=" << klass->GetStatus(); 2639 2640 Thread* self = Thread::Current(); 2641 2642 mirror::AbstractMethod* clinit = NULL; 2643 { 2644 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 2645 ObjectLock lock(self, klass); 2646 2647 if (klass->GetStatus() == mirror::Class::kStatusInitialized) { 2648 return true; 2649 } 2650 2651 if (klass->IsErroneous()) { 2652 ThrowEarlierClassFailure(klass); 2653 return false; 2654 } 2655 2656 if (klass->GetStatus() == mirror::Class::kStatusResolved || 2657 klass->GetStatus() == mirror::Class::kStatusRetryVerificationAtRuntime) { 2658 VerifyClass(klass); 2659 if (klass->GetStatus() != mirror::Class::kStatusVerified) { 2660 if (klass->GetStatus() == mirror::Class::kStatusError) { 2661 CHECK(self->IsExceptionPending()); 2662 } 2663 return false; 2664 } 2665 } 2666 2667 clinit = klass->FindDeclaredDirectMethod("<clinit>", "()V"); 2668 if (clinit != NULL && !can_run_clinit) { 2669 // if the class has a <clinit> but we can't run it during compilation, 2670 // don't bother going to kStatusInitializing. We return false so that 2671 // sub-classes don't believe this class is initialized. 2672 // Opportunistically link non-static methods, TODO: don't initialize and dirty pages 2673 // in second pass. 2674 return false; 2675 } 2676 2677 // If the class is kStatusInitializing, either this thread is 2678 // initializing higher up the stack or another thread has beat us 2679 // to initializing and we need to wait. Either way, this 2680 // invocation of InitializeClass will not be responsible for 2681 // running <clinit> and will return. 2682 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 2683 // We caught somebody else in the act; was it us? 2684 if (klass->GetClinitThreadId() == self->GetTid()) { 2685 // Yes. That's fine. Return so we can continue initializing. 2686 return true; 2687 } 2688 // No. That's fine. Wait for another thread to finish initializing. 2689 return WaitForInitializeClass(klass, self, lock); 2690 } 2691 2692 if (!ValidateSuperClassDescriptors(klass)) { 2693 klass->SetStatus(mirror::Class::kStatusError); 2694 lock.NotifyAll(); 2695 return false; 2696 } 2697 2698 DCHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass); 2699 2700 klass->SetClinitThreadId(self->GetTid()); 2701 klass->SetStatus(mirror::Class::kStatusInitializing); 2702 } 2703 2704 uint64_t t0 = NanoTime(); 2705 2706 if (!InitializeSuperClass(klass, can_run_clinit, can_init_statics)) { 2707 // Super class initialization failed, this can be because we can't run 2708 // super-class class initializers in which case we'll be verified. 2709 // Otherwise this class is erroneous. 2710 if (!can_run_clinit) { 2711 CHECK(klass->IsVerified()); 2712 } else { 2713 CHECK(klass->IsErroneous()); 2714 } 2715 // Signal to any waiting threads that saw this class as initializing. 2716 ObjectLock lock(self, klass); 2717 lock.NotifyAll(); 2718 return false; 2719 } 2720 2721 bool has_static_field_initializers = InitializeStaticFields(klass); 2722 2723 if (clinit != NULL) { 2724 if (Runtime::Current()->IsStarted()) { 2725 JValue result; 2726 clinit->Invoke(self, NULL, 0, &result, 'V'); 2727 } else { 2728 art::interpreter::EnterInterpreterFromInvoke(self, clinit, NULL, NULL, NULL); 2729 } 2730 } 2731 2732 FixupStaticTrampolines(klass); 2733 2734 uint64_t t1 = NanoTime(); 2735 2736 bool success = true; 2737 { 2738 ObjectLock lock(self, klass); 2739 2740 if (self->IsExceptionPending()) { 2741 WrapExceptionInInitializer(); 2742 klass->SetStatus(mirror::Class::kStatusError); 2743 success = false; 2744 } else { 2745 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 2746 RuntimeStats* thread_stats = self->GetStats(); 2747 ++global_stats->class_init_count; 2748 ++thread_stats->class_init_count; 2749 global_stats->class_init_time_ns += (t1 - t0); 2750 thread_stats->class_init_time_ns += (t1 - t0); 2751 // Set the class as initialized except if we can't initialize static fields and static field 2752 // initialization is necessary. 2753 if (!can_init_statics && has_static_field_initializers) { 2754 klass->SetStatus(mirror::Class::kStatusVerified); // Don't leave class in initializing state. 2755 success = false; 2756 } else { 2757 klass->SetStatus(mirror::Class::kStatusInitialized); 2758 } 2759 if (VLOG_IS_ON(class_linker)) { 2760 ClassHelper kh(klass); 2761 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 2762 } 2763 } 2764 lock.NotifyAll(); 2765 } 2766 return success; 2767} 2768 2769bool ClassLinker::WaitForInitializeClass(mirror::Class* klass, Thread* self, ObjectLock& lock) 2770 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2771 while (true) { 2772 self->AssertNoPendingException(); 2773 lock.WaitIgnoringInterrupts(); 2774 2775 // When we wake up, repeat the test for init-in-progress. If 2776 // there's an exception pending (only possible if 2777 // "interruptShouldThrow" was set), bail out. 2778 if (self->IsExceptionPending()) { 2779 WrapExceptionInInitializer(); 2780 klass->SetStatus(mirror::Class::kStatusError); 2781 return false; 2782 } 2783 // Spurious wakeup? Go back to waiting. 2784 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 2785 continue; 2786 } 2787 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 2788 // Compile time initialization failed. 2789 return false; 2790 } 2791 if (klass->IsErroneous()) { 2792 // The caller wants an exception, but it was thrown in a 2793 // different thread. Synthesize one here. 2794 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 2795 PrettyDescriptor(klass).c_str()); 2796 return false; 2797 } 2798 if (klass->IsInitialized()) { 2799 return true; 2800 } 2801 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass) << " is " << klass->GetStatus(); 2802 } 2803 LOG(FATAL) << "Not Reached" << PrettyClass(klass); 2804} 2805 2806bool ClassLinker::ValidateSuperClassDescriptors(const mirror::Class* klass) { 2807 if (klass->IsInterface()) { 2808 return true; 2809 } 2810 // begin with the methods local to the superclass 2811 if (klass->HasSuperClass() && 2812 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 2813 const mirror::Class* super = klass->GetSuperClass(); 2814 for (int i = super->GetVTable()->GetLength() - 1; i >= 0; --i) { 2815 const mirror::AbstractMethod* method = klass->GetVTable()->Get(i); 2816 if (method != super->GetVTable()->Get(i) && 2817 !IsSameMethodSignatureInDifferentClassContexts(method, super, klass)) { 2818 ThrowLinkageError(klass, "Class %s method %s resolves differently in superclass %s", 2819 PrettyDescriptor(klass).c_str(), PrettyMethod(method).c_str(), 2820 PrettyDescriptor(super).c_str()); 2821 return false; 2822 } 2823 } 2824 } 2825 mirror::IfTable* iftable = klass->GetIfTable(); 2826 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 2827 mirror::Class* interface = iftable->GetInterface(i); 2828 if (klass->GetClassLoader() != interface->GetClassLoader()) { 2829 for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { 2830 const mirror::AbstractMethod* method = iftable->GetMethodArray(i)->Get(j); 2831 if (!IsSameMethodSignatureInDifferentClassContexts(method, interface, 2832 method->GetDeclaringClass())) { 2833 ThrowLinkageError(klass, "Class %s method %s resolves differently in interface %s", 2834 PrettyDescriptor(method->GetDeclaringClass()).c_str(), 2835 PrettyMethod(method).c_str(), 2836 PrettyDescriptor(interface).c_str()); 2837 return false; 2838 } 2839 } 2840 } 2841 } 2842 return true; 2843} 2844 2845// Returns true if classes referenced by the signature of the method are the 2846// same classes in klass1 as they are in klass2. 2847bool ClassLinker::IsSameMethodSignatureInDifferentClassContexts(const mirror::AbstractMethod* method, 2848 const mirror::Class* klass1, 2849 const mirror::Class* klass2) { 2850 if (klass1 == klass2) { 2851 return true; 2852 } 2853 const DexFile& dex_file = *method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 2854 const DexFile::ProtoId& proto_id = 2855 dex_file.GetMethodPrototype(dex_file.GetMethodId(method->GetDexMethodIndex())); 2856 for (DexFileParameterIterator it(dex_file, proto_id); it.HasNext(); it.Next()) { 2857 const char* descriptor = it.GetDescriptor(); 2858 if (descriptor == NULL) { 2859 break; 2860 } 2861 if (descriptor[0] == 'L' || descriptor[0] == '[') { 2862 // Found a non-primitive type. 2863 if (!IsSameDescriptorInDifferentClassContexts(descriptor, klass1, klass2)) { 2864 return false; 2865 } 2866 } 2867 } 2868 // Check the return type 2869 const char* descriptor = dex_file.GetReturnTypeDescriptor(proto_id); 2870 if (descriptor[0] == 'L' || descriptor[0] == '[') { 2871 if (!IsSameDescriptorInDifferentClassContexts(descriptor, klass1, klass2)) { 2872 return false; 2873 } 2874 } 2875 return true; 2876} 2877 2878// Returns true if the descriptor resolves to the same class in the context of klass1 and klass2. 2879bool ClassLinker::IsSameDescriptorInDifferentClassContexts(const char* descriptor, 2880 const mirror::Class* klass1, 2881 const mirror::Class* klass2) { 2882 CHECK(descriptor != NULL); 2883 CHECK(klass1 != NULL); 2884 CHECK(klass2 != NULL); 2885 if (klass1 == klass2) { 2886 return true; 2887 } 2888 mirror::Class* found1 = FindClass(descriptor, klass1->GetClassLoader()); 2889 if (found1 == NULL) { 2890 Thread::Current()->ClearException(); 2891 } 2892 mirror::Class* found2 = FindClass(descriptor, klass2->GetClassLoader()); 2893 if (found2 == NULL) { 2894 Thread::Current()->ClearException(); 2895 } 2896 return found1 == found2; 2897} 2898 2899bool ClassLinker::InitializeSuperClass(mirror::Class* klass, bool can_run_clinit, bool can_init_fields) { 2900 CHECK(klass != NULL); 2901 if (!klass->IsInterface() && klass->HasSuperClass()) { 2902 mirror::Class* super_class = klass->GetSuperClass(); 2903 if (!super_class->IsInitialized()) { 2904 CHECK(!super_class->IsInterface()); 2905 // Must hold lock on object when initializing and setting status. 2906 Thread* self = Thread::Current(); 2907 ObjectLock lock(self, klass); 2908 bool super_initialized = InitializeClass(super_class, can_run_clinit, can_init_fields); 2909 // TODO: check for a pending exception 2910 if (!super_initialized) { 2911 if (!can_run_clinit) { 2912 // Don't set status to error when we can't run <clinit>. 2913 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusInitializing) << PrettyClass(klass); 2914 klass->SetStatus(mirror::Class::kStatusVerified); 2915 return false; 2916 } 2917 klass->SetStatus(mirror::Class::kStatusError); 2918 klass->NotifyAll(self); 2919 return false; 2920 } 2921 } 2922 } 2923 return true; 2924} 2925 2926bool ClassLinker::EnsureInitialized(mirror::Class* c, bool can_run_clinit, bool can_init_fields) { 2927 DCHECK(c != NULL); 2928 if (c->IsInitialized()) { 2929 return true; 2930 } 2931 2932 Thread* self = Thread::Current(); 2933 ScopedThreadStateChange tsc(self, kRunnable); 2934 bool success = InitializeClass(c, can_run_clinit, can_init_fields); 2935 if (!success) { 2936 CHECK(self->IsExceptionPending() || !can_run_clinit) << PrettyClass(c); 2937 } 2938 return success; 2939} 2940 2941void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 2942 mirror::Class* c, SafeMap<uint32_t, mirror::Field*>& field_map) { 2943 mirror::ClassLoader* cl = c->GetClassLoader(); 2944 const byte* class_data = dex_file.GetClassData(dex_class_def); 2945 ClassDataItemIterator it(dex_file, class_data); 2946 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2947 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), c->GetDexCache(), cl, true)); 2948 } 2949} 2950 2951bool ClassLinker::InitializeStaticFields(mirror::Class* klass) { 2952 size_t num_static_fields = klass->NumStaticFields(); 2953 if (num_static_fields == 0) { 2954 return false; 2955 } 2956 mirror::DexCache* dex_cache = klass->GetDexCache(); 2957 // TODO: this seems like the wrong check. do we really want !IsPrimitive && !IsArray? 2958 if (dex_cache == NULL) { 2959 return false; 2960 } 2961 ClassHelper kh(klass); 2962 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 2963 CHECK(dex_class_def != NULL); 2964 const DexFile& dex_file = kh.GetDexFile(); 2965 EncodedStaticFieldValueIterator it(dex_file, dex_cache, klass->GetClassLoader(), 2966 this, *dex_class_def); 2967 2968 if (it.HasNext()) { 2969 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 2970 SafeMap<uint32_t, mirror::Field*> field_map; 2971 ConstructFieldMap(dex_file, *dex_class_def, klass, field_map); 2972 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 2973 it.ReadValueToField(field_map.Get(i)); 2974 } 2975 return true; 2976 } 2977 return false; 2978} 2979 2980bool ClassLinker::LinkClass(SirtRef<mirror::Class>& klass, 2981 mirror::ObjectArray<mirror::Class>* interfaces) { 2982 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 2983 if (!LinkSuperClass(klass)) { 2984 return false; 2985 } 2986 if (!LinkMethods(klass, interfaces)) { 2987 return false; 2988 } 2989 if (!LinkInstanceFields(klass)) { 2990 return false; 2991 } 2992 if (!LinkStaticFields(klass)) { 2993 return false; 2994 } 2995 CreateReferenceInstanceOffsets(klass); 2996 CreateReferenceStaticOffsets(klass); 2997 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 2998 klass->SetStatus(mirror::Class::kStatusResolved); 2999 return true; 3000} 3001 3002bool ClassLinker::LoadSuperAndInterfaces(SirtRef<mirror::Class>& klass, const DexFile& dex_file) { 3003 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3004 StringPiece descriptor(dex_file.StringByTypeIdx(klass->GetDexTypeIndex())); 3005 const DexFile::ClassDef* class_def = dex_file.FindClassDef(descriptor); 3006 CHECK(class_def != NULL); 3007 uint16_t super_class_idx = class_def->superclass_idx_; 3008 if (super_class_idx != DexFile::kDexNoIndex16) { 3009 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.get()); 3010 if (super_class == NULL) { 3011 DCHECK(Thread::Current()->IsExceptionPending()); 3012 return false; 3013 } 3014 // Verify 3015 if (!klass->CanAccess(super_class)) { 3016 ThrowIllegalAccessError(klass.get(), "Class %s extended by class %s is inaccessible", 3017 PrettyDescriptor(super_class).c_str(), 3018 PrettyDescriptor(klass.get()).c_str()); 3019 return false; 3020 } 3021 klass->SetSuperClass(super_class); 3022 } 3023 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(*class_def); 3024 if (interfaces != NULL) { 3025 for (size_t i = 0; i < interfaces->Size(); i++) { 3026 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3027 mirror::Class* interface = ResolveType(dex_file, idx, klass.get()); 3028 if (interface == NULL) { 3029 DCHECK(Thread::Current()->IsExceptionPending()); 3030 return false; 3031 } 3032 // Verify 3033 if (!klass->CanAccess(interface)) { 3034 // TODO: the RI seemed to ignore this in my testing. 3035 ThrowIllegalAccessError(klass.get(), "Interface %s implemented by class %s is inaccessible", 3036 PrettyDescriptor(interface).c_str(), 3037 PrettyDescriptor(klass.get()).c_str()); 3038 return false; 3039 } 3040 } 3041 } 3042 // Mark the class as loaded. 3043 klass->SetStatus(mirror::Class::kStatusLoaded); 3044 return true; 3045} 3046 3047bool ClassLinker::LinkSuperClass(SirtRef<mirror::Class>& klass) { 3048 CHECK(!klass->IsPrimitive()); 3049 mirror::Class* super = klass->GetSuperClass(); 3050 if (klass.get() == GetClassRoot(kJavaLangObject)) { 3051 if (super != NULL) { 3052 ThrowClassFormatError(klass.get(), "java.lang.Object must not have a superclass"); 3053 return false; 3054 } 3055 return true; 3056 } 3057 if (super == NULL) { 3058 ThrowLinkageError(klass.get(), "No superclass defined for class %s", 3059 PrettyDescriptor(klass.get()).c_str()); 3060 return false; 3061 } 3062 // Verify 3063 if (super->IsFinal() || super->IsInterface()) { 3064 ThrowIncompatibleClassChangeError(klass.get(), "Superclass %s of %s is %s", 3065 PrettyDescriptor(super).c_str(), 3066 PrettyDescriptor(klass.get()).c_str(), 3067 super->IsFinal() ? "declared final" : "an interface"); 3068 return false; 3069 } 3070 if (!klass->CanAccess(super)) { 3071 ThrowIllegalAccessError(klass.get(), "Superclass %s is inaccessible to class %s", 3072 PrettyDescriptor(super).c_str(), 3073 PrettyDescriptor(klass.get()).c_str()); 3074 return false; 3075 } 3076 3077 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3078 if (super->IsFinalizable()) { 3079 klass->SetFinalizable(); 3080 } 3081 3082 // Inherit reference flags (if any) from the superclass. 3083 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3084 if (reference_flags != 0) { 3085 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3086 } 3087 // Disallow custom direct subclasses of java.lang.ref.Reference. 3088 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3089 ThrowLinkageError(klass.get(), 3090 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3091 PrettyDescriptor(klass.get()).c_str()); 3092 return false; 3093 } 3094 3095#ifndef NDEBUG 3096 // Ensure super classes are fully resolved prior to resolving fields.. 3097 while (super != NULL) { 3098 CHECK(super->IsResolved()); 3099 super = super->GetSuperClass(); 3100 } 3101#endif 3102 return true; 3103} 3104 3105// Populate the class vtable and itable. Compute return type indices. 3106bool ClassLinker::LinkMethods(SirtRef<mirror::Class>& klass, 3107 mirror::ObjectArray<mirror::Class>* interfaces) { 3108 if (klass->IsInterface()) { 3109 // No vtable. 3110 size_t count = klass->NumVirtualMethods(); 3111 if (!IsUint(16, count)) { 3112 ThrowClassFormatError(klass.get(), "Too many methods on interface: %zd", count); 3113 return false; 3114 } 3115 for (size_t i = 0; i < count; ++i) { 3116 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3117 } 3118 // Link interface method tables 3119 return LinkInterfaceMethods(klass, interfaces); 3120 } else { 3121 // Link virtual and interface method tables 3122 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3123 } 3124 return true; 3125} 3126 3127bool ClassLinker::LinkVirtualMethods(SirtRef<mirror::Class>& klass) { 3128 Thread* self = Thread::Current(); 3129 if (klass->HasSuperClass()) { 3130 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3131 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3132 CHECK_LE(actual_count, max_count); 3133 // TODO: do not assign to the vtable field until it is fully constructed. 3134 SirtRef<mirror::ObjectArray<mirror::AbstractMethod> > 3135 vtable(self, klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count)); 3136 // See if any of our virtual methods override the superclass. 3137 MethodHelper local_mh(NULL, this); 3138 MethodHelper super_mh(NULL, this); 3139 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3140 mirror::AbstractMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3141 local_mh.ChangeMethod(local_method); 3142 size_t j = 0; 3143 for (; j < actual_count; ++j) { 3144 mirror::AbstractMethod* super_method = vtable->Get(j); 3145 super_mh.ChangeMethod(super_method); 3146 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3147 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3148 if (super_method->IsFinal()) { 3149 ThrowLinkageError(klass.get(), "Method %s overrides final method in class %s", 3150 PrettyMethod(local_method).c_str(), 3151 super_mh.GetDeclaringClassDescriptor()); 3152 return false; 3153 } 3154 vtable->Set(j, local_method); 3155 local_method->SetMethodIndex(j); 3156 break; 3157 } else { 3158 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3159 << " would have incorrectly overridden the package-private method in " 3160 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3161 } 3162 } 3163 } 3164 if (j == actual_count) { 3165 // Not overriding, append. 3166 vtable->Set(actual_count, local_method); 3167 local_method->SetMethodIndex(actual_count); 3168 actual_count += 1; 3169 } 3170 } 3171 if (!IsUint(16, actual_count)) { 3172 ThrowClassFormatError(klass.get(), "Too many methods defined on class: %zd", actual_count); 3173 return false; 3174 } 3175 // Shrink vtable if possible 3176 CHECK_LE(actual_count, max_count); 3177 if (actual_count < max_count) { 3178 vtable.reset(vtable->CopyOf(self, actual_count)); 3179 } 3180 klass->SetVTable(vtable.get()); 3181 } else { 3182 CHECK(klass.get() == GetClassRoot(kJavaLangObject)); 3183 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3184 if (!IsUint(16, num_virtual_methods)) { 3185 ThrowClassFormatError(klass.get(), "Too many methods: %d", num_virtual_methods); 3186 return false; 3187 } 3188 SirtRef<mirror::ObjectArray<mirror::AbstractMethod> > 3189 vtable(self, AllocMethodArray(self, num_virtual_methods)); 3190 for (size_t i = 0; i < num_virtual_methods; ++i) { 3191 mirror::AbstractMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3192 vtable->Set(i, virtual_method); 3193 virtual_method->SetMethodIndex(i & 0xFFFF); 3194 } 3195 klass->SetVTable(vtable.get()); 3196 } 3197 return true; 3198} 3199 3200bool ClassLinker::LinkInterfaceMethods(SirtRef<mirror::Class>& klass, 3201 mirror::ObjectArray<mirror::Class>* interfaces) { 3202 size_t super_ifcount; 3203 if (klass->HasSuperClass()) { 3204 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3205 } else { 3206 super_ifcount = 0; 3207 } 3208 size_t ifcount = super_ifcount; 3209 ClassHelper kh(klass.get(), this); 3210 uint32_t num_interfaces = interfaces == NULL ? kh.NumDirectInterfaces() : interfaces->GetLength(); 3211 ifcount += num_interfaces; 3212 for (size_t i = 0; i < num_interfaces; i++) { 3213 mirror::Class* interface = interfaces == NULL ? kh.GetDirectInterface(i) : interfaces->Get(i); 3214 ifcount += interface->GetIfTableCount(); 3215 } 3216 if (ifcount == 0) { 3217 // Class implements no interfaces. 3218 DCHECK_EQ(klass->GetIfTableCount(), 0); 3219 DCHECK(klass->GetIfTable() == NULL); 3220 return true; 3221 } 3222 if (ifcount == super_ifcount) { 3223 // Class implements same interfaces as parent, are any of these not marker interfaces? 3224 bool has_non_marker_interface = false; 3225 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3226 for (size_t i = 0; i < ifcount; ++i) { 3227 if (super_iftable->GetMethodArrayCount(i) > 0) { 3228 has_non_marker_interface = true; 3229 break; 3230 } 3231 } 3232 if (!has_non_marker_interface) { 3233 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3234 klass->SetIfTable(super_iftable); 3235 return true; 3236 } 3237 } 3238 Thread* self = Thread::Current(); 3239 SirtRef<mirror::IfTable> iftable(self, AllocIfTable(self, ifcount)); 3240 if (super_ifcount != 0) { 3241 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3242 for (size_t i = 0; i < super_ifcount; i++) { 3243 mirror::Class* super_interface = super_iftable->GetInterface(i); 3244 iftable->SetInterface(i, super_interface); 3245 } 3246 } 3247 // Flatten the interface inheritance hierarchy. 3248 size_t idx = super_ifcount; 3249 for (size_t i = 0; i < num_interfaces; i++) { 3250 mirror::Class* interface = interfaces == NULL ? kh.GetDirectInterface(i) : interfaces->Get(i); 3251 DCHECK(interface != NULL); 3252 if (!interface->IsInterface()) { 3253 ClassHelper ih(interface); 3254 ThrowIncompatibleClassChangeError(klass.get(), "Class %s implements non-interface class %s", 3255 PrettyDescriptor(klass.get()).c_str(), 3256 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3257 return false; 3258 } 3259 // Check if interface is already in iftable 3260 bool duplicate = false; 3261 for (size_t j = 0; j < idx; j++) { 3262 mirror::Class* existing_interface = iftable->GetInterface(j); 3263 if (existing_interface == interface) { 3264 duplicate = true; 3265 break; 3266 } 3267 } 3268 if (!duplicate) { 3269 // Add this non-duplicate interface. 3270 iftable->SetInterface(idx++, interface); 3271 // Add this interface's non-duplicate super-interfaces. 3272 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3273 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3274 bool super_duplicate = false; 3275 for (size_t k = 0; k < idx; k++) { 3276 mirror::Class* existing_interface = iftable->GetInterface(k); 3277 if (existing_interface == super_interface) { 3278 super_duplicate = true; 3279 break; 3280 } 3281 } 3282 if (!super_duplicate) { 3283 iftable->SetInterface(idx++, super_interface); 3284 } 3285 } 3286 } 3287 } 3288 // Shrink iftable in case duplicates were found 3289 if (idx < ifcount) { 3290 iftable.reset(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3291 ifcount = idx; 3292 } else { 3293 CHECK_EQ(idx, ifcount); 3294 } 3295 klass->SetIfTable(iftable.get()); 3296 3297 // If we're an interface, we don't need the vtable pointers, so we're done. 3298 if (klass->IsInterface()) { 3299 return true; 3300 } 3301 std::vector<mirror::AbstractMethod*> miranda_list; 3302 MethodHelper vtable_mh(NULL, this); 3303 MethodHelper interface_mh(NULL, this); 3304 for (size_t i = 0; i < ifcount; ++i) { 3305 mirror::Class* interface = iftable->GetInterface(i); 3306 size_t num_methods = interface->NumVirtualMethods(); 3307 if (num_methods > 0) { 3308 mirror::ObjectArray<mirror::AbstractMethod>* method_array = 3309 AllocMethodArray(self, num_methods); 3310 iftable->SetMethodArray(i, method_array); 3311 mirror::ObjectArray<mirror::AbstractMethod>* vtable = klass->GetVTableDuringLinking(); 3312 for (size_t j = 0; j < num_methods; ++j) { 3313 mirror::AbstractMethod* interface_method = interface->GetVirtualMethod(j); 3314 interface_mh.ChangeMethod(interface_method); 3315 int32_t k; 3316 // For each method listed in the interface's method list, find the 3317 // matching method in our class's method list. We want to favor the 3318 // subclass over the superclass, which just requires walking 3319 // back from the end of the vtable. (This only matters if the 3320 // superclass defines a private method and this class redefines 3321 // it -- otherwise it would use the same vtable slot. In .dex files 3322 // those don't end up in the virtual method table, so it shouldn't 3323 // matter which direction we go. We walk it backward anyway.) 3324 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3325 mirror::AbstractMethod* vtable_method = vtable->Get(k); 3326 vtable_mh.ChangeMethod(vtable_method); 3327 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3328 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3329 ThrowIllegalAccessError(klass.get(), 3330 "Method '%s' implementing interface method '%s' is not public", 3331 PrettyMethod(vtable_method).c_str(), 3332 PrettyMethod(interface_method).c_str()); 3333 return false; 3334 } 3335 method_array->Set(j, vtable_method); 3336 break; 3337 } 3338 } 3339 if (k < 0) { 3340 SirtRef<mirror::AbstractMethod> miranda_method(self, NULL); 3341 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3342 mirror::AbstractMethod* mir_method = miranda_list[mir]; 3343 vtable_mh.ChangeMethod(mir_method); 3344 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3345 miranda_method.reset(miranda_list[mir]); 3346 break; 3347 } 3348 } 3349 if (miranda_method.get() == NULL) { 3350 // point the interface table at a phantom slot 3351 miranda_method.reset(down_cast<mirror::AbstractMethod*>(interface_method->Clone(self))); 3352 miranda_list.push_back(miranda_method.get()); 3353 } 3354 method_array->Set(j, miranda_method.get()); 3355 } 3356 } 3357 } 3358 } 3359 if (!miranda_list.empty()) { 3360 int old_method_count = klass->NumVirtualMethods(); 3361 int new_method_count = old_method_count + miranda_list.size(); 3362 klass->SetVirtualMethods((old_method_count == 0) 3363 ? AllocMethodArray(self, new_method_count) 3364 : klass->GetVirtualMethods()->CopyOf(self, new_method_count)); 3365 3366 SirtRef<mirror::ObjectArray<mirror::AbstractMethod> > 3367 vtable(self, klass->GetVTableDuringLinking()); 3368 CHECK(vtable.get() != NULL); 3369 int old_vtable_count = vtable->GetLength(); 3370 int new_vtable_count = old_vtable_count + miranda_list.size(); 3371 vtable.reset(vtable->CopyOf(self, new_vtable_count)); 3372 for (size_t i = 0; i < miranda_list.size(); ++i) { 3373 mirror::AbstractMethod* method = miranda_list[i]; 3374 // Leave the declaring class alone as type indices are relative to it 3375 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3376 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3377 klass->SetVirtualMethod(old_method_count + i, method); 3378 vtable->Set(old_vtable_count + i, method); 3379 } 3380 // TODO: do not assign to the vtable field until it is fully constructed. 3381 klass->SetVTable(vtable.get()); 3382 } 3383 3384 mirror::ObjectArray<mirror::AbstractMethod>* vtable = klass->GetVTableDuringLinking(); 3385 for (int i = 0; i < vtable->GetLength(); ++i) { 3386 CHECK(vtable->Get(i) != NULL); 3387 } 3388 3389// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3390 3391 return true; 3392} 3393 3394bool ClassLinker::LinkInstanceFields(SirtRef<mirror::Class>& klass) { 3395 CHECK(klass.get() != NULL); 3396 return LinkFields(klass, false); 3397} 3398 3399bool ClassLinker::LinkStaticFields(SirtRef<mirror::Class>& klass) { 3400 CHECK(klass.get() != NULL); 3401 size_t allocated_class_size = klass->GetClassSize(); 3402 bool success = LinkFields(klass, true); 3403 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3404 return success; 3405} 3406 3407struct LinkFieldsComparator { 3408 explicit LinkFieldsComparator(FieldHelper* fh) 3409 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 3410 : fh_(fh) {} 3411 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3412 bool operator()(const mirror::Field* field1, const mirror::Field* field2) 3413 NO_THREAD_SAFETY_ANALYSIS { 3414 // First come reference fields, then 64-bit, and finally 32-bit 3415 fh_->ChangeField(field1); 3416 Primitive::Type type1 = fh_->GetTypeAsPrimitiveType(); 3417 fh_->ChangeField(field2); 3418 Primitive::Type type2 = fh_->GetTypeAsPrimitiveType(); 3419 bool isPrimitive1 = type1 != Primitive::kPrimNot; 3420 bool isPrimitive2 = type2 != Primitive::kPrimNot; 3421 bool is64bit1 = isPrimitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3422 bool is64bit2 = isPrimitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3423 int order1 = (!isPrimitive1 ? 0 : (is64bit1 ? 1 : 2)); 3424 int order2 = (!isPrimitive2 ? 0 : (is64bit2 ? 1 : 2)); 3425 if (order1 != order2) { 3426 return order1 < order2; 3427 } 3428 3429 // same basic group? then sort by string. 3430 fh_->ChangeField(field1); 3431 StringPiece name1(fh_->GetName()); 3432 fh_->ChangeField(field2); 3433 StringPiece name2(fh_->GetName()); 3434 return name1 < name2; 3435 } 3436 3437 FieldHelper* fh_; 3438}; 3439 3440bool ClassLinker::LinkFields(SirtRef<mirror::Class>& klass, bool is_static) { 3441 size_t num_fields = 3442 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3443 3444 mirror::ObjectArray<mirror::Field>* fields = 3445 is_static ? klass->GetSFields() : klass->GetIFields(); 3446 3447 // Initialize size and field_offset 3448 size_t size; 3449 MemberOffset field_offset(0); 3450 if (is_static) { 3451 size = klass->GetClassSize(); 3452 field_offset = mirror::Class::FieldsOffset(); 3453 } else { 3454 mirror::Class* super_class = klass->GetSuperClass(); 3455 if (super_class != NULL) { 3456 CHECK(super_class->IsResolved()); 3457 field_offset = MemberOffset(super_class->GetObjectSize()); 3458 } 3459 size = field_offset.Uint32Value(); 3460 } 3461 3462 CHECK_EQ(num_fields == 0, fields == NULL); 3463 3464 // we want a relatively stable order so that adding new fields 3465 // minimizes disruption of C++ version such as Class and Method. 3466 std::deque<mirror::Field*> grouped_and_sorted_fields; 3467 for (size_t i = 0; i < num_fields; i++) { 3468 grouped_and_sorted_fields.push_back(fields->Get(i)); 3469 } 3470 FieldHelper fh(NULL, this); 3471 std::sort(grouped_and_sorted_fields.begin(), 3472 grouped_and_sorted_fields.end(), 3473 LinkFieldsComparator(&fh)); 3474 3475 // References should be at the front. 3476 size_t current_field = 0; 3477 size_t num_reference_fields = 0; 3478 for (; current_field < num_fields; current_field++) { 3479 mirror::Field* field = grouped_and_sorted_fields.front(); 3480 fh.ChangeField(field); 3481 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3482 bool isPrimitive = type != Primitive::kPrimNot; 3483 if (isPrimitive) { 3484 break; // past last reference, move on to the next phase 3485 } 3486 grouped_and_sorted_fields.pop_front(); 3487 num_reference_fields++; 3488 fields->Set(current_field, field); 3489 field->SetOffset(field_offset); 3490 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3491 } 3492 3493 // Now we want to pack all of the double-wide fields together. If 3494 // we're not aligned, though, we want to shuffle one 32-bit field 3495 // into place. If we can't find one, we'll have to pad it. 3496 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3497 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3498 mirror::Field* field = grouped_and_sorted_fields[i]; 3499 fh.ChangeField(field); 3500 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3501 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3502 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 3503 continue; 3504 } 3505 fields->Set(current_field++, field); 3506 field->SetOffset(field_offset); 3507 // drop the consumed field 3508 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 3509 break; 3510 } 3511 // whether we found a 32-bit field for padding or not, we advance 3512 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3513 } 3514 3515 // Alignment is good, shuffle any double-wide fields forward, and 3516 // finish assigning field offsets to all fields. 3517 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 3518 while (!grouped_and_sorted_fields.empty()) { 3519 mirror::Field* field = grouped_and_sorted_fields.front(); 3520 grouped_and_sorted_fields.pop_front(); 3521 fh.ChangeField(field); 3522 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3523 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3524 fields->Set(current_field, field); 3525 field->SetOffset(field_offset); 3526 field_offset = MemberOffset(field_offset.Uint32Value() + 3527 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 3528 ? sizeof(uint64_t) 3529 : sizeof(uint32_t))); 3530 current_field++; 3531 } 3532 3533 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 3534 if (!is_static && 3535 StringPiece(ClassHelper(klass.get(), this).GetDescriptor()) == "Ljava/lang/ref/Reference;") { 3536 // We know there are no non-reference fields in the Reference classes, and we know 3537 // that 'referent' is alphabetically last, so this is easy... 3538 CHECK_EQ(num_reference_fields, num_fields); 3539 fh.ChangeField(fields->Get(num_fields - 1)); 3540 CHECK_STREQ(fh.GetName(), "referent"); 3541 --num_reference_fields; 3542 } 3543 3544#ifndef NDEBUG 3545 // Make sure that all reference fields appear before 3546 // non-reference fields, and all double-wide fields are aligned. 3547 bool seen_non_ref = false; 3548 for (size_t i = 0; i < num_fields; i++) { 3549 mirror::Field* field = fields->Get(i); 3550 if (false) { // enable to debug field layout 3551 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 3552 << " class=" << PrettyClass(klass.get()) 3553 << " field=" << PrettyField(field) 3554 << " offset=" << field->GetField32(MemberOffset(mirror::Field::OffsetOffset()), 3555 false); 3556 } 3557 fh.ChangeField(field); 3558 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3559 bool is_primitive = type != Primitive::kPrimNot; 3560 if (StringPiece(ClassHelper(klass.get(), this).GetDescriptor()) == "Ljava/lang/ref/Reference;" && 3561 StringPiece(fh.GetName()) == "referent") { 3562 is_primitive = true; // We lied above, so we have to expect a lie here. 3563 } 3564 if (is_primitive) { 3565 if (!seen_non_ref) { 3566 seen_non_ref = true; 3567 DCHECK_EQ(num_reference_fields, i); 3568 } 3569 } else { 3570 DCHECK(!seen_non_ref); 3571 } 3572 } 3573 if (!seen_non_ref) { 3574 DCHECK_EQ(num_fields, num_reference_fields); 3575 } 3576#endif 3577 size = field_offset.Uint32Value(); 3578 // Update klass 3579 if (is_static) { 3580 klass->SetNumReferenceStaticFields(num_reference_fields); 3581 klass->SetClassSize(size); 3582 } else { 3583 klass->SetNumReferenceInstanceFields(num_reference_fields); 3584 if (!klass->IsVariableSize()) { 3585 DCHECK_GE(size, sizeof(mirror::Object)) << ClassHelper(klass.get(), this).GetDescriptor(); 3586 klass->SetObjectSize(size); 3587 } 3588 } 3589 return true; 3590} 3591 3592// Set the bitmap of reference offsets, refOffsets, from the ifields 3593// list. 3594void ClassLinker::CreateReferenceInstanceOffsets(SirtRef<mirror::Class>& klass) { 3595 uint32_t reference_offsets = 0; 3596 mirror::Class* super_class = klass->GetSuperClass(); 3597 if (super_class != NULL) { 3598 reference_offsets = super_class->GetReferenceInstanceOffsets(); 3599 // If our superclass overflowed, we don't stand a chance. 3600 if (reference_offsets == CLASS_WALK_SUPER) { 3601 klass->SetReferenceInstanceOffsets(reference_offsets); 3602 return; 3603 } 3604 } 3605 CreateReferenceOffsets(klass, false, reference_offsets); 3606} 3607 3608void ClassLinker::CreateReferenceStaticOffsets(SirtRef<mirror::Class>& klass) { 3609 CreateReferenceOffsets(klass, true, 0); 3610} 3611 3612void ClassLinker::CreateReferenceOffsets(SirtRef<mirror::Class>& klass, bool is_static, 3613 uint32_t reference_offsets) { 3614 size_t num_reference_fields = 3615 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 3616 : klass->NumReferenceInstanceFieldsDuringLinking(); 3617 const mirror::ObjectArray<mirror::Field>* fields = 3618 is_static ? klass->GetSFields() : klass->GetIFields(); 3619 // All of the fields that contain object references are guaranteed 3620 // to be at the beginning of the fields list. 3621 for (size_t i = 0; i < num_reference_fields; ++i) { 3622 // Note that byte_offset is the offset from the beginning of 3623 // object, not the offset into instance data 3624 const mirror::Field* field = fields->Get(i); 3625 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 3626 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 3627 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 3628 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 3629 CHECK_NE(new_bit, 0U); 3630 reference_offsets |= new_bit; 3631 } else { 3632 reference_offsets = CLASS_WALK_SUPER; 3633 break; 3634 } 3635 } 3636 // Update fields in klass 3637 if (is_static) { 3638 klass->SetReferenceStaticOffsets(reference_offsets); 3639 } else { 3640 klass->SetReferenceInstanceOffsets(reference_offsets); 3641 } 3642} 3643 3644mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, 3645 uint32_t string_idx, mirror::DexCache* dex_cache) { 3646 DCHECK(dex_cache != NULL); 3647 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 3648 if (resolved != NULL) { 3649 return resolved; 3650 } 3651 const DexFile::StringId& string_id = dex_file.GetStringId(string_idx); 3652 int32_t utf16_length = dex_file.GetStringLength(string_id); 3653 const char* utf8_data = dex_file.GetStringData(string_id); 3654 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 3655 dex_cache->SetResolvedString(string_idx, string); 3656 return string; 3657} 3658 3659mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, 3660 uint16_t type_idx, 3661 mirror::DexCache* dex_cache, 3662 mirror::ClassLoader* class_loader) { 3663 DCHECK(dex_cache != NULL); 3664 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 3665 if (resolved == NULL) { 3666 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 3667 resolved = FindClass(descriptor, class_loader); 3668 if (resolved != NULL) { 3669 // TODO: we used to throw here if resolved's class loader was not the 3670 // boot class loader. This was to permit different classes with the 3671 // same name to be loaded simultaneously by different loaders 3672 dex_cache->SetResolvedType(type_idx, resolved); 3673 } else { 3674 Thread* self = Thread::Current(); 3675 CHECK(self->IsExceptionPending()) 3676 << "Expected pending exception for failed resolution of: " << descriptor; 3677 // Convert a ClassNotFoundException to a NoClassDefFoundError. 3678 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 3679 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 3680 Thread::Current()->ClearException(); 3681 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 3682 self->GetException(NULL)->SetCause(cause.get()); 3683 } 3684 } 3685 } 3686 return resolved; 3687} 3688 3689mirror::AbstractMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 3690 uint32_t method_idx, 3691 mirror::DexCache* dex_cache, 3692 mirror::ClassLoader* class_loader, 3693 const mirror::AbstractMethod* referrer, 3694 InvokeType type) { 3695 DCHECK(dex_cache != NULL); 3696 // Check for hit in the dex cache. 3697 mirror::AbstractMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 3698 if (resolved != NULL) { 3699 return resolved; 3700 } 3701 // Fail, get the declaring class. 3702 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 3703 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 3704 if (klass == NULL) { 3705 DCHECK(Thread::Current()->IsExceptionPending()); 3706 return NULL; 3707 } 3708 // Scan using method_idx, this saves string compares but will only hit for matching dex 3709 // caches/files. 3710 switch (type) { 3711 case kDirect: // Fall-through. 3712 case kStatic: 3713 resolved = klass->FindDirectMethod(dex_cache, method_idx); 3714 break; 3715 case kInterface: 3716 resolved = klass->FindInterfaceMethod(dex_cache, method_idx); 3717 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 3718 break; 3719 case kSuper: // Fall-through. 3720 case kVirtual: 3721 resolved = klass->FindVirtualMethod(dex_cache, method_idx); 3722 break; 3723 default: 3724 LOG(FATAL) << "Unreachable - invocation type: " << type; 3725 } 3726 if (resolved == NULL) { 3727 // Search by name, which works across dex files. 3728 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 3729 std::string signature(dex_file.CreateMethodSignature(method_id.proto_idx_, NULL)); 3730 switch (type) { 3731 case kDirect: // Fall-through. 3732 case kStatic: 3733 resolved = klass->FindDirectMethod(name, signature); 3734 break; 3735 case kInterface: 3736 resolved = klass->FindInterfaceMethod(name, signature); 3737 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 3738 break; 3739 case kSuper: // Fall-through. 3740 case kVirtual: 3741 resolved = klass->FindVirtualMethod(name, signature); 3742 break; 3743 } 3744 } 3745 if (resolved != NULL) { 3746 // We found a method, check for incompatible class changes. 3747 if (resolved->CheckIncompatibleClassChange(type)) { 3748 resolved = NULL; 3749 } 3750 } 3751 if (resolved != NULL) { 3752 // Be a good citizen and update the dex cache to speed subsequent calls. 3753 dex_cache->SetResolvedMethod(method_idx, resolved); 3754 return resolved; 3755 } else { 3756 // We failed to find the method which means either an access error, an incompatible class 3757 // change, or no such method. First try to find the method among direct and virtual methods. 3758 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 3759 std::string signature(dex_file.CreateMethodSignature(method_id.proto_idx_, NULL)); 3760 switch (type) { 3761 case kDirect: 3762 case kStatic: 3763 resolved = klass->FindVirtualMethod(name, signature); 3764 break; 3765 case kInterface: 3766 case kVirtual: 3767 case kSuper: 3768 resolved = klass->FindDirectMethod(name, signature); 3769 break; 3770 } 3771 3772 // If we found something, check that it can be accessed by the referrer. 3773 if (resolved != NULL && referrer != NULL) { 3774 mirror::Class* methods_class = resolved->GetDeclaringClass(); 3775 mirror::Class* referring_class = referrer->GetDeclaringClass(); 3776 if (!referring_class->CanAccess(methods_class)) { 3777 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 3778 referrer, resolved, type); 3779 return NULL; 3780 } else if (!referring_class->CanAccessMember(methods_class, 3781 resolved->GetAccessFlags())) { 3782 ThrowIllegalAccessErrorMethod(referring_class, resolved); 3783 return NULL; 3784 } 3785 } 3786 3787 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 3788 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 3789 switch (type) { 3790 case kDirect: 3791 case kStatic: 3792 if (resolved != NULL) { 3793 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 3794 } else { 3795 resolved = klass->FindInterfaceMethod(name, signature); 3796 if (resolved != NULL) { 3797 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 3798 } else { 3799 ThrowNoSuchMethodError(type, klass, name, signature); 3800 } 3801 } 3802 break; 3803 case kInterface: 3804 if (resolved != NULL) { 3805 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 3806 } else { 3807 resolved = klass->FindVirtualMethod(name, signature); 3808 if (resolved != NULL) { 3809 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 3810 } else { 3811 ThrowNoSuchMethodError(type, klass, name, signature); 3812 } 3813 } 3814 break; 3815 case kSuper: 3816 ThrowNoSuchMethodError(type, klass, name, signature); 3817 break; 3818 case kVirtual: 3819 if (resolved != NULL) { 3820 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 3821 } else { 3822 resolved = klass->FindInterfaceMethod(name, signature); 3823 if (resolved != NULL) { 3824 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 3825 } else { 3826 ThrowNoSuchMethodError(type, klass, name, signature); 3827 } 3828 } 3829 break; 3830 } 3831 DCHECK(Thread::Current()->IsExceptionPending()); 3832 return NULL; 3833 } 3834} 3835 3836mirror::Field* ClassLinker::ResolveField(const DexFile& dex_file, 3837 uint32_t field_idx, 3838 mirror::DexCache* dex_cache, 3839 mirror::ClassLoader* class_loader, 3840 bool is_static) { 3841 DCHECK(dex_cache != NULL); 3842 mirror::Field* resolved = dex_cache->GetResolvedField(field_idx); 3843 if (resolved != NULL) { 3844 return resolved; 3845 } 3846 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 3847 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 3848 if (klass == NULL) { 3849 DCHECK(Thread::Current()->IsExceptionPending()); 3850 return NULL; 3851 } 3852 3853 if (is_static) { 3854 resolved = klass->FindStaticField(dex_cache, field_idx); 3855 } else { 3856 resolved = klass->FindInstanceField(dex_cache, field_idx); 3857 } 3858 3859 if (resolved == NULL) { 3860 const char* name = dex_file.GetFieldName(field_id); 3861 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 3862 if (is_static) { 3863 resolved = klass->FindStaticField(name, type); 3864 } else { 3865 resolved = klass->FindInstanceField(name, type); 3866 } 3867 if (resolved == NULL) { 3868 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 3869 return NULL; 3870 } 3871 } 3872 dex_cache->SetResolvedField(field_idx, resolved); 3873 return resolved; 3874} 3875 3876mirror::Field* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 3877 uint32_t field_idx, 3878 mirror::DexCache* dex_cache, 3879 mirror::ClassLoader* class_loader) { 3880 DCHECK(dex_cache != NULL); 3881 mirror::Field* resolved = dex_cache->GetResolvedField(field_idx); 3882 if (resolved != NULL) { 3883 return resolved; 3884 } 3885 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 3886 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 3887 if (klass == NULL) { 3888 DCHECK(Thread::Current()->IsExceptionPending()); 3889 return NULL; 3890 } 3891 3892 const char* name = dex_file.GetFieldName(field_id); 3893 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 3894 resolved = klass->FindField(name, type); 3895 if (resolved != NULL) { 3896 dex_cache->SetResolvedField(field_idx, resolved); 3897 } else { 3898 ThrowNoSuchFieldError("", klass, type, name); 3899 } 3900 return resolved; 3901} 3902 3903const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::AbstractMethod* referrer, 3904 uint32_t* length) { 3905 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 3906 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 3907 const DexFile& dex_file = *dex_cache->GetDexFile(); 3908 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 3909 return dex_file.GetMethodShorty(method_id, length); 3910} 3911 3912void ClassLinker::DumpAllClasses(int flags) const { 3913 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 3914 // lock held, because it might need to resolve a field's type, which would try to take the lock. 3915 std::vector<mirror::Class*> all_classes; 3916 { 3917 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3918 typedef Table::const_iterator It; // TODO: C++0x auto 3919 for (It it = classes_.begin(), end = classes_.end(); it != end; ++it) { 3920 all_classes.push_back(it->second); 3921 } 3922 for (It it = image_classes_.begin(), end = image_classes_.end(); it != end; ++it) { 3923 all_classes.push_back(it->second); 3924 } 3925 } 3926 3927 for (size_t i = 0; i < all_classes.size(); ++i) { 3928 all_classes[i]->DumpClass(std::cerr, flags); 3929 } 3930} 3931 3932void ClassLinker::DumpForSigQuit(std::ostream& os) const { 3933 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3934 os << "Loaded classes: " << image_classes_.size() << " image classes; " 3935 << classes_.size() << " allocated classes\n"; 3936} 3937 3938size_t ClassLinker::NumLoadedClasses() const { 3939 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3940 return classes_.size() + image_classes_.size(); 3941} 3942 3943pid_t ClassLinker::GetClassesLockOwner() { 3944 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 3945} 3946 3947pid_t ClassLinker::GetDexLockOwner() { 3948 return dex_lock_.GetExclusiveOwnerTid(); 3949} 3950 3951void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 3952 DCHECK(!init_done_); 3953 3954 DCHECK(klass != NULL); 3955 DCHECK(klass->GetClassLoader() == NULL); 3956 3957 DCHECK(class_roots_ != NULL); 3958 DCHECK(class_roots_->Get(class_root) == NULL); 3959 class_roots_->Set(class_root, klass); 3960} 3961 3962} // namespace art 3963