class_linker.cc revision 2b7c4d196c8abe32f4ca633534917da9de53c359
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 23#include <deque> 24#include <string> 25#include <utility> 26#include <vector> 27 28#include "base/casts.h" 29#include "base/logging.h" 30#include "base/stl_util.h" 31#include "base/unix_file/fd_file.h" 32#include "class_linker-inl.h" 33#include "compiler_callbacks.h" 34#include "debugger.h" 35#include "dex_file-inl.h" 36#include "gc/accounting/card_table-inl.h" 37#include "gc/accounting/heap_bitmap.h" 38#include "gc/heap.h" 39#include "gc/space/image_space.h" 40#include "handle_scope.h" 41#include "intern_table.h" 42#include "interpreter/interpreter.h" 43#include "leb128.h" 44#include "oat.h" 45#include "oat_file.h" 46#include "mirror/art_field-inl.h" 47#include "mirror/art_method-inl.h" 48#include "mirror/class.h" 49#include "mirror/class-inl.h" 50#include "mirror/class_loader.h" 51#include "mirror/dex_cache-inl.h" 52#include "mirror/iftable-inl.h" 53#include "mirror/object-inl.h" 54#include "mirror/object_array-inl.h" 55#include "mirror/proxy.h" 56#include "mirror/stack_trace_element.h" 57#include "object_utils.h" 58#include "os.h" 59#include "runtime.h" 60#include "entrypoints/entrypoint_utils.h" 61#include "ScopedLocalRef.h" 62#include "scoped_thread_state_change.h" 63#include "handle_scope-inl.h" 64#include "thread.h" 65#include "UniquePtrCompat.h" 66#include "utils.h" 67#include "verifier/method_verifier.h" 68#include "well_known_classes.h" 69 70namespace art { 71 72static void ThrowNoClassDefFoundError(const char* fmt, ...) 73 __attribute__((__format__(__printf__, 1, 2))) 74 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 75static void ThrowNoClassDefFoundError(const char* fmt, ...) { 76 va_list args; 77 va_start(args, fmt); 78 Thread* self = Thread::Current(); 79 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 80 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 81 va_end(args); 82} 83 84static void ThrowEarlierClassFailure(mirror::Class* c) 85 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 86 // The class failed to initialize on a previous attempt, so we want to throw 87 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 88 // failed in verification, in which case v2 5.4.1 says we need to re-throw 89 // the previous error. 90 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 91 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 92 } 93 94 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 95 Thread* self = Thread::Current(); 96 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 97 if (c->GetVerifyErrorClass() != NULL) { 98 // TODO: change the verifier to store an _instance_, with a useful detail message? 99 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor().c_str(), 100 PrettyDescriptor(c).c_str()); 101 } else { 102 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 103 PrettyDescriptor(c).c_str()); 104 } 105} 106 107static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 108 Thread* self = Thread::Current(); 109 JNIEnv* env = self->GetJniEnv(); 110 111 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 112 CHECK(cause.get() != NULL); 113 114 env->ExceptionClear(); 115 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 116 env->Throw(cause.get()); 117 118 // We only wrap non-Error exceptions; an Error can just be used as-is. 119 if (!is_error) { 120 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 121 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 122 } 123} 124 125static size_t Hash(const char* s) { 126 // This is the java.lang.String hashcode for convenience, not interoperability. 127 size_t hash = 0; 128 for (; *s != '\0'; ++s) { 129 hash = hash * 31 + *s; 130 } 131 return hash; 132} 133 134const char* ClassLinker::class_roots_descriptors_[] = { 135 "Ljava/lang/Class;", 136 "Ljava/lang/Object;", 137 "[Ljava/lang/Class;", 138 "[Ljava/lang/Object;", 139 "Ljava/lang/String;", 140 "Ljava/lang/DexCache;", 141 "Ljava/lang/ref/Reference;", 142 "Ljava/lang/reflect/ArtField;", 143 "Ljava/lang/reflect/ArtMethod;", 144 "Ljava/lang/reflect/Proxy;", 145 "[Ljava/lang/String;", 146 "[Ljava/lang/reflect/ArtField;", 147 "[Ljava/lang/reflect/ArtMethod;", 148 "Ljava/lang/ClassLoader;", 149 "Ljava/lang/Throwable;", 150 "Ljava/lang/ClassNotFoundException;", 151 "Ljava/lang/StackTraceElement;", 152 "Z", 153 "B", 154 "C", 155 "D", 156 "F", 157 "I", 158 "J", 159 "S", 160 "V", 161 "[Z", 162 "[B", 163 "[C", 164 "[D", 165 "[F", 166 "[I", 167 "[J", 168 "[S", 169 "[Ljava/lang/StackTraceElement;", 170}; 171 172ClassLinker::ClassLinker(InternTable* intern_table) 173 // dex_lock_ is recursive as it may be used in stack dumping. 174 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 175 dex_cache_image_class_lookup_required_(false), 176 failed_dex_cache_class_lookups_(0), 177 class_roots_(nullptr), 178 array_iftable_(nullptr), 179 find_array_class_cache_next_victim_(0), 180 init_done_(false), 181 log_new_dex_caches_roots_(false), 182 log_new_class_table_roots_(false), 183 intern_table_(intern_table), 184 portable_resolution_trampoline_(nullptr), 185 quick_resolution_trampoline_(nullptr), 186 portable_imt_conflict_trampoline_(nullptr), 187 quick_imt_conflict_trampoline_(nullptr), 188 quick_generic_jni_trampoline_(nullptr), 189 quick_to_interpreter_bridge_trampoline_(nullptr) { 190 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 191 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 192} 193 194// To set a value for generic JNI. May be necessary in compiler tests. 195extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 196 197void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 198 VLOG(startup) << "ClassLinker::Init"; 199 CHECK(Runtime::Current()->IsCompiler()); 200 201 CHECK(!init_done_); 202 203 // java_lang_Class comes first, it's needed for AllocClass 204 Thread* self = Thread::Current(); 205 gc::Heap* heap = Runtime::Current()->GetHeap(); 206 // The GC can't handle an object with a null class since we can't get the size of this object. 207 heap->IncrementDisableMovingGC(self); 208 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 209 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 210 heap->AllocNonMovableObject<true>(self, nullptr, sizeof(mirror::ClassClass), VoidFunctor())))); 211 CHECK(java_lang_Class.Get() != NULL); 212 mirror::Class::SetClassClass(java_lang_Class.Get()); 213 java_lang_Class->SetClass(java_lang_Class.Get()); 214 if (kUseBakerOrBrooksReadBarrier) { 215 java_lang_Class->AssertReadBarrierPointer(); 216 } 217 java_lang_Class->SetClassSize(sizeof(mirror::ClassClass)); 218 heap->DecrementDisableMovingGC(self); 219 // AllocClass(mirror::Class*) can now be used 220 221 // Class[] is used for reflection support. 222 Handle<mirror::Class> class_array_class( 223 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 224 class_array_class->SetComponentType(java_lang_Class.Get()); 225 226 // java_lang_Object comes next so that object_array_class can be created. 227 Handle<mirror::Class> java_lang_Object( 228 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 229 CHECK(java_lang_Object.Get() != NULL); 230 // backfill Object as the super class of Class. 231 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 232 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 233 234 // Object[] next to hold class roots. 235 Handle<mirror::Class> object_array_class( 236 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 237 object_array_class->SetComponentType(java_lang_Object.Get()); 238 239 // Setup the char class to be used for char[]. 240 Handle<mirror::Class> char_class(hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 241 242 // Setup the char[] class to be used for String. 243 Handle<mirror::Class> char_array_class(hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 244 char_array_class->SetComponentType(char_class.Get()); 245 mirror::CharArray::SetArrayClass(char_array_class.Get()); 246 247 // Setup String. 248 Handle<mirror::Class> java_lang_String(hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::StringClass)))); 249 mirror::String::SetClass(java_lang_String.Get()); 250 java_lang_String->SetObjectSize(sizeof(mirror::String)); 251 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 252 253 // Create storage for root classes, save away our work so far (requires descriptors). 254 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 255 kClassRootsMax); 256 CHECK(class_roots_ != NULL); 257 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 258 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 259 SetClassRoot(kClassArrayClass, class_array_class.Get()); 260 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 261 SetClassRoot(kCharArrayClass, char_array_class.Get()); 262 SetClassRoot(kJavaLangString, java_lang_String.Get()); 263 264 // Setup the primitive type classes. 265 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 266 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 267 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 268 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 269 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 270 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 271 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 272 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 273 274 // Create array interface entries to populate once we can load system classes. 275 array_iftable_ = AllocIfTable(self, 2); 276 277 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 278 Handle<mirror::Class> int_array_class( 279 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 280 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 281 mirror::IntArray::SetArrayClass(int_array_class.Get()); 282 SetClassRoot(kIntArrayClass, int_array_class.Get()); 283 284 // now that these are registered, we can use AllocClass() and AllocObjectArray 285 286 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 287 Handle<mirror::Class> java_lang_DexCache( 288 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::DexCacheClass)))); 289 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 290 java_lang_DexCache->SetObjectSize(sizeof(mirror::DexCache)); 291 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 292 293 // Constructor, Field, Method, and AbstractMethod are necessary so that FindClass can link members. 294 Handle<mirror::Class> java_lang_reflect_ArtField( 295 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::ArtFieldClass)))); 296 CHECK(java_lang_reflect_ArtField.Get() != NULL); 297 java_lang_reflect_ArtField->SetObjectSize(sizeof(mirror::ArtField)); 298 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 299 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 300 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 301 302 Handle<mirror::Class> java_lang_reflect_ArtMethod( 303 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::ArtMethodClass)))); 304 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 305 java_lang_reflect_ArtMethod->SetObjectSize(sizeof(mirror::ArtMethod)); 306 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 307 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 308 309 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 310 311 // Set up array classes for string, field, method 312 Handle<mirror::Class> object_array_string( 313 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 314 object_array_string->SetComponentType(java_lang_String.Get()); 315 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 316 317 Handle<mirror::Class> object_array_art_method( 318 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 319 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 320 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 321 322 Handle<mirror::Class> object_array_art_field( 323 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 324 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 325 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 326 327 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 328 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 329 // these roots. 330 CHECK_NE(0U, boot_class_path.size()); 331 for (size_t i = 0; i != boot_class_path.size(); ++i) { 332 const DexFile* dex_file = boot_class_path[i]; 333 CHECK(dex_file != NULL); 334 AppendToBootClassPath(*dex_file); 335 } 336 337 // now we can use FindSystemClass 338 339 // run char class through InitializePrimitiveClass to finish init 340 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 341 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 342 343 // Create runtime resolution and imt conflict methods. Also setup the default imt. 344 Runtime* runtime = Runtime::Current(); 345 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 346 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 347 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 348 349 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 350 // we do not need friend classes or a publicly exposed setter. 351 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 352 353 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 354 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 355 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 356 CHECK_EQ(java_lang_Object.Get(), Object_class); 357 CHECK_EQ(java_lang_Object->GetObjectSize(), sizeof(mirror::Object)); 358 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 359 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 360 CHECK_EQ(java_lang_String.Get(), String_class); 361 CHECK_EQ(java_lang_String->GetObjectSize(), sizeof(mirror::String)); 362 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 363 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 364 CHECK_EQ(java_lang_String.Get(), String_class); 365 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 366 CHECK_EQ(java_lang_DexCache->GetObjectSize(), sizeof(mirror::DexCache)); 367 368 // Setup the primitive array type classes - can't be done until Object has a vtable. 369 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 370 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 371 372 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 373 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 374 375 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 376 CHECK_EQ(char_array_class.Get(), found_char_array_class); 377 378 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 379 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 380 381 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 382 CHECK_EQ(int_array_class.Get(), found_int_array_class); 383 384 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 385 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 386 387 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 388 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 389 390 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 391 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 392 393 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 394 CHECK_EQ(class_array_class.Get(), found_class_array_class); 395 396 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 397 CHECK_EQ(object_array_class.Get(), found_object_array_class); 398 399 // Setup the single, global copy of "iftable". 400 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 401 CHECK(java_lang_Cloneable != NULL); 402 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 403 CHECK(java_io_Serializable != NULL); 404 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 405 // crawl up and explicitly list all of the supers as well. 406 array_iftable_->SetInterface(0, java_lang_Cloneable); 407 array_iftable_->SetInterface(1, java_io_Serializable); 408 409 // Sanity check Class[] and Object[]'s interfaces. 410 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 411 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 412 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 413 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 414 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 415 // dex_cache_ fields and register them in class_table_. 416 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 417 CHECK_EQ(java_lang_Class.Get(), Class_class); 418 419 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 420 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 421 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 422 423 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 424 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 425 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 426 427 mirror::Class* String_array_class = FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 428 CHECK_EQ(object_array_string.Get(), String_array_class); 429 430 mirror::Class* Art_method_array_class = 431 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 432 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 433 434 mirror::Class* Art_field_array_class = 435 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 436 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 437 438 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 439 440 // Create java.lang.reflect.Proxy root. 441 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 442 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 443 444 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 445 mirror::Class* java_lang_ref_Reference = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 446 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference); 447 mirror::Class* java_lang_ref_FinalizerReference = FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 448 java_lang_ref_FinalizerReference->SetAccessFlags( 449 java_lang_ref_FinalizerReference->GetAccessFlags() | 450 kAccClassIsReference | kAccClassIsFinalizerReference); 451 mirror::Class* java_lang_ref_PhantomReference = FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 452 java_lang_ref_PhantomReference->SetAccessFlags( 453 java_lang_ref_PhantomReference->GetAccessFlags() | 454 kAccClassIsReference | kAccClassIsPhantomReference); 455 mirror::Class* java_lang_ref_SoftReference = FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 456 java_lang_ref_SoftReference->SetAccessFlags( 457 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 458 mirror::Class* java_lang_ref_WeakReference = FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 459 java_lang_ref_WeakReference->SetAccessFlags( 460 java_lang_ref_WeakReference->GetAccessFlags() | 461 kAccClassIsReference | kAccClassIsWeakReference); 462 463 // Setup the ClassLoader, verifying the object_size_. 464 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 465 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), sizeof(mirror::ClassLoader)); 466 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 467 468 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 469 // java.lang.StackTraceElement as a convenience. 470 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 471 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 472 SetClassRoot(kJavaLangClassNotFoundException, FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 473 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 474 SetClassRoot(kJavaLangStackTraceElementArrayClass, FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 475 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 476 477 FinishInit(self); 478 479 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 480} 481 482void ClassLinker::FinishInit(Thread* self) { 483 VLOG(startup) << "ClassLinker::FinishInit entering"; 484 485 // Let the heap know some key offsets into java.lang.ref instances 486 // Note: we hard code the field indexes here rather than using FindInstanceField 487 // as the types of the field can't be resolved prior to the runtime being 488 // fully initialized 489 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 490 mirror::Class* java_lang_ref_FinalizerReference = 491 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 492 493 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 494 FieldHelper fh(pendingNext); 495 CHECK_STREQ(fh.GetName(), "pendingNext"); 496 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 497 498 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 499 fh.ChangeField(queue); 500 CHECK_STREQ(fh.GetName(), "queue"); 501 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 502 503 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 504 fh.ChangeField(queueNext); 505 CHECK_STREQ(fh.GetName(), "queueNext"); 506 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 507 508 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 509 fh.ChangeField(referent); 510 CHECK_STREQ(fh.GetName(), "referent"); 511 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 512 513 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 514 fh.ChangeField(zombie); 515 CHECK_STREQ(fh.GetName(), "zombie"); 516 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 517 518 // ensure all class_roots_ are initialized 519 for (size_t i = 0; i < kClassRootsMax; i++) { 520 ClassRoot class_root = static_cast<ClassRoot>(i); 521 mirror::Class* klass = GetClassRoot(class_root); 522 CHECK(klass != NULL); 523 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 524 // note SetClassRoot does additional validation. 525 // if possible add new checks there to catch errors early 526 } 527 528 CHECK(array_iftable_ != NULL); 529 530 // disable the slow paths in FindClass and CreatePrimitiveClass now 531 // that Object, Class, and Object[] are setup 532 init_done_ = true; 533 534 VLOG(startup) << "ClassLinker::FinishInit exiting"; 535} 536 537void ClassLinker::RunRootClinits() { 538 Thread* self = Thread::Current(); 539 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 540 mirror::Class* c = GetClassRoot(ClassRoot(i)); 541 if (!c->IsArrayClass() && !c->IsPrimitive()) { 542 StackHandleScope<1> hs(self); 543 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 544 EnsureInitialized(h_class, true, true); 545 self->AssertNoPendingException(); 546 } 547 } 548} 549 550bool ClassLinker::GenerateOatFile(const char* dex_filename, 551 int oat_fd, 552 const char* oat_cache_filename, 553 std::string* error_msg) { 554 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 555 std::string dex2oat(GetAndroidRoot()); 556 dex2oat += (kIsDebugBuild ? "/bin/dex2oatd" : "/bin/dex2oat"); 557 558 gc::Heap* heap = Runtime::Current()->GetHeap(); 559 std::string boot_image_option("--boot-image="); 560 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 561 562 std::string dex_file_option("--dex-file="); 563 dex_file_option += dex_filename; 564 565 std::string oat_fd_option("--oat-fd="); 566 StringAppendF(&oat_fd_option, "%d", oat_fd); 567 568 std::string oat_location_option("--oat-location="); 569 oat_location_option += oat_cache_filename; 570 571 std::vector<std::string> argv; 572 argv.push_back(dex2oat); 573 argv.push_back("--runtime-arg"); 574 argv.push_back("-Xms64m"); 575 argv.push_back("--runtime-arg"); 576 argv.push_back("-Xmx64m"); 577 argv.push_back("--runtime-arg"); 578 argv.push_back("-classpath"); 579 argv.push_back("--runtime-arg"); 580 argv.push_back(Runtime::Current()->GetClassPathString()); 581 582 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 583 584 if (!Runtime::Current()->IsVerificationEnabled()) { 585 argv.push_back("--compiler-filter=verify-none"); 586 } 587 588 if (!kIsTargetBuild) { 589 argv.push_back("--host"); 590 } 591 592 argv.push_back(boot_image_option); 593 argv.push_back(dex_file_option); 594 argv.push_back(oat_fd_option); 595 argv.push_back(oat_location_option); 596 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 597 for (size_t i = 0; i < compiler_options.size(); ++i) { 598 argv.push_back(compiler_options[i].c_str()); 599 } 600 601 return Exec(argv, error_msg); 602} 603 604const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 605 WriterMutexLock mu(Thread::Current(), dex_lock_); 606 if (kIsDebugBuild) { 607 for (size_t i = 0; i < oat_files_.size(); ++i) { 608 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 609 } 610 } 611 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 612 oat_files_.push_back(oat_file); 613 return oat_file; 614} 615 616OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 617 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 618 OatFile* oat_file = space->ReleaseOatFile(); 619 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 620 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 621 return *oat_file; 622} 623 624const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 625 const char* dex_location = dex_file.GetLocation().c_str(); 626 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 627 return FindOpenedOatFileFromDexLocation(dex_location, &dex_location_checksum); 628} 629 630const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation(const char* dex_location, 631 const uint32_t* const dex_location_checksum) { 632 ReaderMutexLock mu(Thread::Current(), dex_lock_); 633 for (size_t i = 0; i < oat_files_.size(); i++) { 634 const OatFile* oat_file = oat_files_[i]; 635 DCHECK(oat_file != NULL); 636 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 637 dex_location_checksum, 638 false); 639 if (oat_dex_file != NULL) { 640 return oat_file; 641 } 642 } 643 return NULL; 644} 645 646const DexFile* ClassLinker::FindDexFileInOatLocation(const char* dex_location, 647 uint32_t dex_location_checksum, 648 const char* oat_location, 649 std::string* error_msg) { 650 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 651 !Runtime::Current()->IsCompiler(), 652 error_msg)); 653 if (oat_file.get() == nullptr) { 654 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 655 error_msg->c_str()); 656 return nullptr; 657 } 658 Runtime* runtime = Runtime::Current(); 659 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 660 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 661 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 662 if (expected_image_oat_checksum != actual_image_oat_checksum) { 663 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 664 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 665 actual_image_oat_checksum); 666 return nullptr; 667 } 668 669 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 670 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 671 if (expected_image_oat_offset != actual_image_oat_offset) { 672 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 673 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 674 actual_image_oat_offset); 675 return nullptr; 676 } 677 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 678 &dex_location_checksum); 679 if (oat_dex_file == nullptr) { 680 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 681 dex_location); 682 return nullptr; 683 } 684 uint32_t expected_dex_checksum = dex_location_checksum; 685 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 686 if (expected_dex_checksum != actual_dex_checksum) { 687 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 688 "found 0x%x", oat_location, expected_dex_checksum, 689 actual_dex_checksum); 690 return nullptr; 691 } 692 const DexFile* dex_file = oat_dex_file->OpenDexFile(error_msg); 693 if (dex_file != nullptr) { 694 RegisterOatFile(oat_file.release()); 695 } 696 return dex_file; 697} 698 699class ScopedFlock { 700 public: 701 ScopedFlock() {} 702 703 bool Init(const char* filename, std::string* error_msg) { 704 while (true) { 705 file_.reset(OS::OpenFileWithFlags(filename, O_CREAT | O_RDWR)); 706 if (file_.get() == NULL) { 707 *error_msg = StringPrintf("Failed to open file '%s': %s", filename, strerror(errno)); 708 return false; 709 } 710 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_EX)); 711 if (flock_result != 0) { 712 *error_msg = StringPrintf("Failed to lock file '%s': %s", filename, strerror(errno)); 713 return false; 714 } 715 struct stat fstat_stat; 716 int fstat_result = TEMP_FAILURE_RETRY(fstat(file_->Fd(), &fstat_stat)); 717 if (fstat_result != 0) { 718 *error_msg = StringPrintf("Failed to fstat file '%s': %s", filename, strerror(errno)); 719 return false; 720 } 721 struct stat stat_stat; 722 int stat_result = TEMP_FAILURE_RETRY(stat(filename, &stat_stat)); 723 if (stat_result != 0) { 724 PLOG(WARNING) << "Failed to stat, will retry: " << filename; 725 // ENOENT can happen if someone racing with us unlinks the file we created so just retry. 726 continue; 727 } 728 if (fstat_stat.st_dev != stat_stat.st_dev || fstat_stat.st_ino != stat_stat.st_ino) { 729 LOG(WARNING) << "File changed while locking, will retry: " << filename; 730 continue; 731 } 732 return true; 733 } 734 } 735 736 File& GetFile() { 737 return *file_; 738 } 739 740 ~ScopedFlock() { 741 if (file_.get() != NULL) { 742 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_UN)); 743 CHECK_EQ(0, flock_result); 744 } 745 } 746 747 private: 748 UniquePtr<File> file_; 749 750 DISALLOW_COPY_AND_ASSIGN(ScopedFlock); 751}; 752 753const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation(const char* dex_location, 754 uint32_t dex_location_checksum, 755 const char* oat_location, 756 std::vector<std::string>* error_msgs) { 757 // We play a locking game here so that if two different processes 758 // race to generate (or worse, one tries to open a partial generated 759 // file) we will be okay. This is actually common with apps that use 760 // DexClassLoader to work around the dex method reference limit and 761 // that have a background service running in a separate process. 762 ScopedFlock scoped_flock; 763 std::string error_msg; 764 if (!scoped_flock.Init(oat_location, &error_msg)) { 765 error_msgs->push_back(error_msg); 766 return nullptr; 767 } 768 769 // Check if we already have an up-to-date output file 770 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, dex_location_checksum, 771 oat_location, &error_msg); 772 if (dex_file != nullptr) { 773 return dex_file; 774 } 775 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 776 dex_location, oat_location, error_msg.c_str()); 777 VLOG(class_linker) << compound_msg; 778 error_msgs->push_back(compound_msg); 779 780 // Generate the output oat file for the dex file 781 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 782 if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location, &error_msg)) { 783 CHECK(!error_msg.empty()); 784 error_msgs->push_back(error_msg); 785 return nullptr; 786 } 787 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 788 !Runtime::Current()->IsCompiler(), 789 &error_msg)); 790 if (oat_file.get() == nullptr) { 791 compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 792 oat_location, error_msg.c_str()); 793 error_msgs->push_back(compound_msg); 794 return nullptr; 795 } 796 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 797 &dex_location_checksum); 798 if (oat_dex_file == nullptr) { 799 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out file " 800 "'%s'", dex_location, dex_location_checksum, oat_location); 801 error_msgs->push_back(error_msg); 802 return nullptr; 803 } 804 const DexFile* result = oat_dex_file->OpenDexFile(&error_msg); 805 CHECK(result != nullptr) << error_msgs << ", " << error_msg; 806 CHECK_EQ(dex_location_checksum, result->GetLocationChecksum()) 807 << "dex_location=" << dex_location << " oat_location=" << oat_location << std::hex 808 << " dex_location_checksum=" << dex_location_checksum 809 << " DexFile::GetLocationChecksum()=" << result->GetLocationChecksum(); 810 RegisterOatFile(oat_file.release()); 811 return result; 812} 813 814bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 815 const char* dex_location, 816 uint32_t dex_location_checksum, 817 const InstructionSet instruction_set, 818 std::string* error_msg) { 819 Runtime* runtime = Runtime::Current(); 820 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 821 822 // If the requested instruction set is the same as the current runtime, 823 // we can use the checksums directly. If it isn't, we'll have to read the 824 // image header from the image for the right instruction set. 825 uint32_t image_oat_checksum = 0; 826 uintptr_t image_oat_data_begin = 0; 827 if (instruction_set == kRuntimeISA) { 828 const ImageHeader& image_header = image_space->GetImageHeader(); 829 image_oat_checksum = image_header.GetOatChecksum(); 830 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 831 } else { 832 UniquePtr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 833 image_space->GetImageLocation().c_str(), instruction_set)); 834 image_oat_checksum = image_header->GetOatChecksum(); 835 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 836 } 837 const OatHeader& oat_header = oat_file->GetOatHeader(); 838 bool image_check = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 839 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 840 841 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 842 if (oat_dex_file == NULL) { 843 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 844 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 845 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 846 for (size_t i = 0; i < oat_dex_files.size(); i++) { 847 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 848 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 849 oat_file->GetLocation().c_str(), 850 oat_dex_file->GetDexFileLocation().c_str()); 851 } 852 return false; 853 } 854 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 855 856 if (image_check && dex_check) { 857 return true; 858 } 859 860 if (!image_check) { 861 ScopedObjectAccess soa(Thread::Current()); 862 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with (0x%x, %" PRIdPTR ")", 863 oat_file->GetLocation().c_str(), 864 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 865 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 866 image_oat_checksum, image_oat_data_begin); 867 } 868 if (!dex_check) { 869 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 870 oat_file->GetLocation().c_str(), 871 oat_dex_file->GetDexFileLocationChecksum(), 872 dex_location, dex_location_checksum); 873 } 874 return false; 875} 876 877const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const std::string& oat_file_location, 878 const char* dex_location, 879 std::string* error_msg, 880 bool* open_failed) { 881 UniquePtr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 882 if (oat_file.get() == nullptr) { 883 *open_failed = true; 884 return nullptr; 885 } 886 *open_failed = false; 887 const DexFile* dex_file = nullptr; 888 uint32_t dex_location_checksum; 889 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 890 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 891 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 892 // directory. 893 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 894 if (oat_dex_file == nullptr) { 895 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 896 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 897 error_msg->c_str()); 898 return nullptr; 899 } 900 dex_file = oat_dex_file->OpenDexFile(error_msg); 901 } else { 902 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 903 kRuntimeISA, error_msg); 904 if (!verified) { 905 return nullptr; 906 } 907 dex_file = oat_file->GetOatDexFile(dex_location, 908 &dex_location_checksum)->OpenDexFile(error_msg); 909 } 910 if (dex_file != nullptr) { 911 RegisterOatFile(oat_file.release()); 912 } 913 return dex_file; 914} 915 916const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const char* dex_location, 917 const uint32_t* const dex_location_checksum, 918 InstructionSet isa, 919 std::vector<std::string>* error_msgs) { 920 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location, 921 dex_location_checksum); 922 if (open_oat_file != nullptr) { 923 const OatFile::OatDexFile* oat_dex_file = open_oat_file->GetOatDexFile(dex_location, 924 dex_location_checksum); 925 std::string error_msg; 926 const DexFile* ret = oat_dex_file->OpenDexFile(&error_msg); 927 if (ret == nullptr) { 928 error_msgs->push_back(error_msg); 929 } 930 return ret; 931 } 932 933 // Look for an existing file next to dex. for example, for 934 // /foo/bar/baz.jar, look for /foo/bar/<isa>/baz.odex. 935 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 936 bool open_failed; 937 std::string error_msg; 938 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(odex_filename, dex_location, 939 &error_msg, &open_failed); 940 if (dex_file != nullptr) { 941 return dex_file; 942 } 943 if (dex_location_checksum == nullptr) { 944 error_msgs->push_back(StringPrintf("Failed to open oat file from %s and no classes.dex found in" 945 "%s: %s", odex_filename.c_str(), dex_location, 946 error_msg.c_str())); 947 return nullptr; 948 } 949 950 std::string cache_error_msg; 951 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 952 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location, 953 dalvik_cache.c_str())); 954 dex_file = VerifyAndOpenDexFileFromOatFile(cache_location, dex_location, &cache_error_msg, 955 &open_failed); 956 if (dex_file != nullptr) { 957 return dex_file; 958 } 959 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 960 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 961 } 962 std::string compound_msg = StringPrintf("Failed to open oat file from %s (error '%s') or %s " 963 "(error '%s').", odex_filename.c_str(), error_msg.c_str(), 964 cache_location.c_str(), cache_error_msg.c_str()); 965 VLOG(class_linker) << compound_msg; 966 error_msgs->push_back(compound_msg); 967 968 // Try to generate oat file if it wasn't found or was obsolete. 969 return FindOrCreateOatFileForDexLocation(dex_location, *dex_location_checksum, 970 cache_location.c_str(), error_msgs); 971} 972 973const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 974 ReaderMutexLock mu(Thread::Current(), dex_lock_); 975 for (size_t i = 0; i < oat_files_.size(); i++) { 976 const OatFile* oat_file = oat_files_[i]; 977 DCHECK(oat_file != nullptr); 978 if (oat_file->GetLocation() == oat_location) { 979 return oat_file; 980 } 981 } 982 return nullptr; 983} 984 985const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 986 std::string* error_msg) { 987 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 988 if (oat_file != nullptr) { 989 return oat_file; 990 } 991 992 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 993 error_msg); 994 if (oat_file == NULL) { 995 return NULL; 996 } 997 return oat_file; 998} 999 1000static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1001 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1002 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1003 1004 DCHECK(obj != NULL); 1005 DCHECK(class_linker != NULL); 1006 1007 if (obj->IsArtMethod()) { 1008 mirror::ArtMethod* method = obj->AsArtMethod(); 1009 if (!method->IsNative()) { 1010 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1011 if (method != Runtime::Current()->GetResolutionMethod()) { 1012 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1013 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1014 } 1015 } 1016 } 1017} 1018 1019void ClassLinker::InitFromImage() { 1020 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1021 CHECK(!init_done_); 1022 1023 Thread* self = Thread::Current(); 1024 gc::Heap* heap = Runtime::Current()->GetHeap(); 1025 gc::space::ImageSpace* space = heap->GetImageSpace(); 1026 dex_cache_image_class_lookup_required_ = true; 1027 CHECK(space != NULL); 1028 OatFile& oat_file = GetImageOatFile(space); 1029 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1030 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1031 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 1032 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1033 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1034 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1035 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1036 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1037 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1038 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1039 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1040 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1041 1042 StackHandleScope<1> hs(self); 1043 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1044 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1045 AsObjectArray<mirror::Class>())); 1046 class_roots_ = class_roots.Get(); 1047 1048 // Special case of setting up the String class early so that we can test arbitrary objects 1049 // as being Strings or not 1050 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1051 1052 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1053 static_cast<uint32_t>(dex_caches->GetLength())); 1054 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1055 StackHandleScope<1> hs(self); 1056 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1057 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1058 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1059 nullptr); 1060 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1061 std::string error_msg; 1062 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1063 if (dex_file == NULL) { 1064 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1065 << " from within oat file " << oat_file.GetLocation() 1066 << " error '" << error_msg << "'"; 1067 } 1068 1069 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1070 1071 AppendToBootClassPath(*dex_file, dex_cache); 1072 } 1073 1074 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1075 // bitmap walk. 1076 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1077 1078 // Set entry point to interpreter if in InterpretOnly mode. 1079 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1080 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1081 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1082 } 1083 1084 // reinit class_roots_ 1085 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1086 class_roots_ = class_roots.Get(); 1087 1088 // reinit array_iftable_ from any array class instance, they should be == 1089 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1090 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1091 // String class root was set above 1092 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1093 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1094 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1095 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1096 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1097 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1098 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1099 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1100 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1101 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1102 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1103 1104 FinishInit(self); 1105 1106 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1107} 1108 1109// Keep in sync with InitCallback. Anything we visit, we need to 1110// reinit references to when reinitializing a ClassLinker from a 1111// mapped image. 1112void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1113 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1114 Thread* self = Thread::Current(); 1115 { 1116 ReaderMutexLock mu(self, dex_lock_); 1117 if ((flags & kVisitRootFlagAllRoots) != 0) { 1118 for (mirror::DexCache*& dex_cache : dex_caches_) { 1119 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1120 } 1121 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1122 for (size_t index : new_dex_cache_roots_) { 1123 callback(reinterpret_cast<mirror::Object**>(&dex_caches_[index]), arg, 0, kRootVMInternal); 1124 } 1125 } 1126 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1127 new_dex_cache_roots_.clear(); 1128 } 1129 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1130 log_new_dex_caches_roots_ = true; 1131 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1132 log_new_dex_caches_roots_ = false; 1133 } 1134 } 1135 { 1136 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 1137 if ((flags & kVisitRootFlagAllRoots) != 0) { 1138 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1139 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1140 } 1141 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1142 for (auto& pair : new_class_roots_) { 1143 mirror::Object* old_ref = pair.second; 1144 callback(reinterpret_cast<mirror::Object**>(&pair.second), arg, 0, kRootStickyClass); 1145 if (UNLIKELY(pair.second != old_ref)) { 1146 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1147 // corresponding object. This is slow, but luckily for us, this may only happen with a 1148 // concurrent moving GC. 1149 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1150 it != end && it->first == pair.first; ++it) { 1151 // If the class stored matches the old class, update it to the new value. 1152 if (old_ref == it->second) { 1153 it->second = pair.second; 1154 } 1155 } 1156 } 1157 } 1158 } 1159 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1160 new_class_roots_.clear(); 1161 } 1162 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1163 log_new_class_table_roots_ = true; 1164 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1165 log_new_class_table_roots_ = false; 1166 } 1167 // We deliberately ignore the class roots in the image since we 1168 // handle image roots by using the MS/CMS rescanning of dirty cards. 1169 } 1170 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1171 DCHECK(array_iftable_ != nullptr); 1172 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1173 if (find_array_class_cache_[i] != nullptr) { 1174 callback(reinterpret_cast<mirror::Object**>(&find_array_class_cache_[i]), arg, 0, 1175 kRootVMInternal); 1176 } 1177 } 1178} 1179 1180void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1181 if (dex_cache_image_class_lookup_required_) { 1182 MoveImageClassesToClassTable(); 1183 } 1184 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1185 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 1186 if (!visitor(it.second, arg)) { 1187 return; 1188 } 1189 } 1190} 1191 1192static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1193 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1194 classes->insert(c); 1195 return true; 1196} 1197 1198void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1199 std::set<mirror::Class*> classes; 1200 VisitClasses(GetClassesVisitor, &classes); 1201 for (mirror::Class* klass : classes) { 1202 if (!visitor(klass, arg)) { 1203 return; 1204 } 1205 } 1206} 1207 1208ClassLinker::~ClassLinker() { 1209 mirror::Class::ResetClass(); 1210 mirror::String::ResetClass(); 1211 mirror::ArtField::ResetClass(); 1212 mirror::ArtMethod::ResetClass(); 1213 mirror::BooleanArray::ResetArrayClass(); 1214 mirror::ByteArray::ResetArrayClass(); 1215 mirror::CharArray::ResetArrayClass(); 1216 mirror::DoubleArray::ResetArrayClass(); 1217 mirror::FloatArray::ResetArrayClass(); 1218 mirror::IntArray::ResetArrayClass(); 1219 mirror::LongArray::ResetArrayClass(); 1220 mirror::ShortArray::ResetArrayClass(); 1221 mirror::Throwable::ResetClass(); 1222 mirror::StackTraceElement::ResetClass(); 1223 STLDeleteElements(&boot_class_path_); 1224 STLDeleteElements(&oat_files_); 1225} 1226 1227mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1228 gc::Heap* heap = Runtime::Current()->GetHeap(); 1229 StackHandleScope<16> hs(self); 1230 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1231 Handle<mirror::DexCache> dex_cache( 1232 hs.NewHandle(down_cast<mirror::DexCache*>( 1233 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1234 VoidFunctor())))); 1235 if (dex_cache.Get() == NULL) { 1236 return NULL; 1237 } 1238 Handle<mirror::String> 1239 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1240 if (location.Get() == NULL) { 1241 return NULL; 1242 } 1243 Handle<mirror::ObjectArray<mirror::String> > 1244 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1245 if (strings.Get() == NULL) { 1246 return NULL; 1247 } 1248 Handle<mirror::ObjectArray<mirror::Class> > 1249 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1250 if (types.Get() == NULL) { 1251 return NULL; 1252 } 1253 Handle<mirror::ObjectArray<mirror::ArtMethod> > 1254 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1255 if (methods.Get() == NULL) { 1256 return NULL; 1257 } 1258 Handle<mirror::ObjectArray<mirror::ArtField> > 1259 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1260 if (fields.Get() == NULL) { 1261 return NULL; 1262 } 1263 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1264 fields.Get()); 1265 return dex_cache.Get(); 1266} 1267 1268// Used to initialize a class in the allocation code path to ensure it is guarded by a StoreStore 1269// fence. 1270class InitializeClassVisitor { 1271 public: 1272 explicit InitializeClassVisitor(uint32_t class_size) : class_size_(class_size) { 1273 } 1274 1275 void operator()(mirror::Object* obj, size_t usable_size) const 1276 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1277 DCHECK_LE(class_size_, usable_size); 1278 // Avoid AsClass as object is not yet in live bitmap or allocation stack. 1279 mirror::Class* klass = down_cast<mirror::Class*>(obj); 1280 // DCHECK(klass->IsClass()); 1281 klass->SetClassSize(class_size_); 1282 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1283 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1284 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1285 } 1286 1287 private: 1288 const uint32_t class_size_; 1289 1290 DISALLOW_COPY_AND_ASSIGN(InitializeClassVisitor); 1291}; 1292 1293mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1294 uint32_t class_size) { 1295 DCHECK_GE(class_size, sizeof(mirror::Class)); 1296 gc::Heap* heap = Runtime::Current()->GetHeap(); 1297 InitializeClassVisitor visitor(class_size); 1298 mirror::Object* k = 1299 kMovingClasses ? heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) 1300 : heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1301 if (UNLIKELY(k == nullptr)) { 1302 CHECK(self->IsExceptionPending()); // OOME. 1303 return nullptr; 1304 } 1305 return k->AsClass(); 1306} 1307 1308mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1309 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1310} 1311 1312mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1313 return down_cast<mirror::ArtField*>( 1314 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1315} 1316 1317mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1318 return down_cast<mirror::ArtMethod*>( 1319 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1320} 1321 1322mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1323 Thread* self, size_t length) { 1324 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1325 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1326} 1327 1328static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1329 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1330 DCHECK(klass != NULL); 1331 // Wait for the class if it has not already been linked. 1332 if (!klass->IsResolved() && !klass->IsErroneous()) { 1333 StackHandleScope<1> hs(self); 1334 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1335 ObjectLock<mirror::Class> lock(self, h_class); 1336 // Check for circular dependencies between classes. 1337 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1338 ThrowClassCircularityError(h_class.Get()); 1339 h_class->SetStatus(mirror::Class::kStatusError, self); 1340 return nullptr; 1341 } 1342 // Wait for the pending initialization to complete. 1343 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1344 lock.WaitIgnoringInterrupts(); 1345 } 1346 } 1347 if (klass->IsErroneous()) { 1348 ThrowEarlierClassFailure(klass); 1349 return nullptr; 1350 } 1351 // Return the loaded class. No exceptions should be pending. 1352 CHECK(klass->IsResolved()) << PrettyClass(klass); 1353 self->AssertNoPendingException(); 1354 return klass; 1355} 1356 1357mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1358 const Handle<mirror::ClassLoader>& class_loader) { 1359 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1360 DCHECK(self != nullptr); 1361 self->AssertNoPendingException(); 1362 if (descriptor[1] == '\0') { 1363 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1364 // for primitive classes that aren't backed by dex files. 1365 return FindPrimitiveClass(descriptor[0]); 1366 } 1367 // Find the class in the loaded classes table. 1368 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1369 if (klass != NULL) { 1370 return EnsureResolved(self, klass); 1371 } 1372 // Class is not yet loaded. 1373 if (descriptor[0] == '[') { 1374 return CreateArrayClass(self, descriptor, class_loader); 1375 } else if (class_loader.Get() == nullptr) { 1376 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1377 if (pair.second != NULL) { 1378 StackHandleScope<1> hs(self); 1379 auto class_loader = hs.NewHandle<mirror::ClassLoader>(nullptr); 1380 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1381 } 1382 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1383 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1384 // throw of a NoClassDefFoundError. 1385 if (IsInBootClassPath(descriptor)) { 1386 mirror::Class* system_class = FindSystemClass(self, descriptor); 1387 CHECK(system_class != NULL); 1388 return system_class; 1389 } 1390 // Next try the compile time class path. 1391 const std::vector<const DexFile*>* class_path; 1392 { 1393 ScopedObjectAccessUnchecked soa(self); 1394 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1395 soa.AddLocalReference<jobject>(class_loader.Get())); 1396 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1397 } 1398 1399 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1400 if (pair.second != NULL) { 1401 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1402 } 1403 1404 } else { 1405 ScopedObjectAccessUnchecked soa(self); 1406 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1407 soa.AddLocalReference<jobject>(class_loader.Get())); 1408 std::string class_name_string(DescriptorToDot(descriptor)); 1409 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1410 { 1411 ScopedThreadStateChange tsc(self, kNative); 1412 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1413 soa.Env()->NewStringUTF(class_name_string.c_str())); 1414 if (class_name_object.get() == NULL) { 1415 return NULL; 1416 } 1417 CHECK(class_loader_object.get() != NULL); 1418 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1419 WellKnownClasses::java_lang_ClassLoader_loadClass, 1420 class_name_object.get())); 1421 } 1422 if (self->IsExceptionPending()) { 1423 // If the ClassLoader threw, pass that exception up. 1424 return NULL; 1425 } else if (result.get() == NULL) { 1426 // broken loader - throw NPE to be compatible with Dalvik 1427 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1428 class_name_string.c_str()).c_str()); 1429 return NULL; 1430 } else { 1431 // success, return mirror::Class* 1432 return soa.Decode<mirror::Class*>(result.get()); 1433 } 1434 } 1435 1436 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1437 return NULL; 1438} 1439 1440mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1441 const Handle<mirror::ClassLoader>& class_loader, 1442 const DexFile& dex_file, 1443 const DexFile::ClassDef& dex_class_def) { 1444 Thread* self = Thread::Current(); 1445 StackHandleScope<2> hs(self); 1446 auto klass = hs.NewHandle<mirror::Class>(nullptr); 1447 // Load the class from the dex file. 1448 if (UNLIKELY(!init_done_)) { 1449 // finish up init of hand crafted class_roots_ 1450 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1451 klass.Assign(GetClassRoot(kJavaLangObject)); 1452 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1453 klass.Assign(GetClassRoot(kJavaLangClass)); 1454 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1455 klass.Assign(GetClassRoot(kJavaLangString)); 1456 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1457 klass.Assign(GetClassRoot(kJavaLangDexCache)); 1458 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1459 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 1460 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1461 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 1462 } else { 1463 klass.Assign(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1464 } 1465 } else { 1466 klass.Assign(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1467 } 1468 if (UNLIKELY(klass.Get() == NULL)) { 1469 CHECK(self->IsExceptionPending()); // Expect an OOME. 1470 return NULL; 1471 } 1472 klass->SetDexCache(FindDexCache(dex_file)); 1473 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 1474 // Check for a pending exception during load 1475 if (self->IsExceptionPending()) { 1476 klass->SetStatus(mirror::Class::kStatusError, self); 1477 return NULL; 1478 } 1479 ObjectLock<mirror::Class> lock(self, klass); 1480 klass->SetClinitThreadId(self->GetTid()); 1481 // Add the newly loaded class to the loaded classes table. 1482 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 1483 if (existing != NULL) { 1484 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1485 // this thread to block. 1486 return EnsureResolved(self, existing); 1487 } 1488 // Finish loading (if necessary) by finding parents 1489 CHECK(!klass->IsLoaded()); 1490 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1491 // Loading failed. 1492 klass->SetStatus(mirror::Class::kStatusError, self); 1493 return NULL; 1494 } 1495 CHECK(klass->IsLoaded()); 1496 // Link the class (if necessary) 1497 CHECK(!klass->IsResolved()); 1498 // TODO: Use fast jobjects? 1499 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1500 if (!LinkClass(self, klass, interfaces)) { 1501 // Linking failed. 1502 klass->SetStatus(mirror::Class::kStatusError, self); 1503 return NULL; 1504 } 1505 CHECK(klass->IsResolved()); 1506 1507 /* 1508 * We send CLASS_PREPARE events to the debugger from here. The 1509 * definition of "preparation" is creating the static fields for a 1510 * class and initializing them to the standard default values, but not 1511 * executing any code (that comes later, during "initialization"). 1512 * 1513 * We did the static preparation in LinkClass. 1514 * 1515 * The class has been prepared and resolved but possibly not yet verified 1516 * at this point. 1517 */ 1518 Dbg::PostClassPrepare(klass.Get()); 1519 1520 return klass.Get(); 1521} 1522 1523// Precomputes size that will be needed for Class, matching LinkStaticFields 1524uint32_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1525 const DexFile::ClassDef& dex_class_def) { 1526 const byte* class_data = dex_file.GetClassData(dex_class_def); 1527 size_t num_ref = 0; 1528 size_t num_32 = 0; 1529 size_t num_64 = 0; 1530 if (class_data != NULL) { 1531 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1532 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1533 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1534 char c = descriptor[0]; 1535 if (c == 'L' || c == '[') { 1536 num_ref++; 1537 } else if (c == 'J' || c == 'D') { 1538 num_64++; 1539 } else { 1540 num_32++; 1541 } 1542 } 1543 } 1544 // start with generic class data 1545 uint32_t size = sizeof(mirror::Class); 1546 // follow with reference fields which must be contiguous at start 1547 size += (num_ref * sizeof(uint32_t)); 1548 // if there are 64-bit fields to add, make sure they are aligned 1549 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1550 if (num_32 != 0) { 1551 // use an available 32-bit field for padding 1552 num_32--; 1553 } 1554 size += sizeof(uint32_t); // either way, we are adding a word 1555 DCHECK_EQ(size, RoundUp(size, 8)); 1556 } 1557 // tack on any 64-bit fields now that alignment is assured 1558 size += (num_64 * sizeof(uint64_t)); 1559 // tack on any remaining 32-bit fields 1560 size += (num_32 * sizeof(uint32_t)); 1561 return size; 1562} 1563 1564OatFile::OatClass ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1565 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1566 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1567 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1568 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1569 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1570 &dex_location_checksum); 1571 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1572 return oat_dex_file->GetOatClass(class_def_idx); 1573} 1574 1575static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1576 uint32_t method_idx) { 1577 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1578 const byte* class_data = dex_file.GetClassData(class_def); 1579 CHECK(class_data != NULL); 1580 ClassDataItemIterator it(dex_file, class_data); 1581 // Skip fields 1582 while (it.HasNextStaticField()) { 1583 it.Next(); 1584 } 1585 while (it.HasNextInstanceField()) { 1586 it.Next(); 1587 } 1588 // Process methods 1589 size_t class_def_method_index = 0; 1590 while (it.HasNextDirectMethod()) { 1591 if (it.GetMemberIndex() == method_idx) { 1592 return class_def_method_index; 1593 } 1594 class_def_method_index++; 1595 it.Next(); 1596 } 1597 while (it.HasNextVirtualMethod()) { 1598 if (it.GetMemberIndex() == method_idx) { 1599 return class_def_method_index; 1600 } 1601 class_def_method_index++; 1602 it.Next(); 1603 } 1604 DCHECK(!it.HasNext()); 1605 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1606 return 0; 1607} 1608 1609const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1610 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1611 // method for direct methods (or virtual methods made direct). 1612 mirror::Class* declaring_class = method->GetDeclaringClass(); 1613 size_t oat_method_index; 1614 if (method->IsStatic() || method->IsDirect()) { 1615 // Simple case where the oat method index was stashed at load time. 1616 oat_method_index = method->GetMethodIndex(); 1617 } else { 1618 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1619 // by search for its position in the declared virtual methods. 1620 oat_method_index = declaring_class->NumDirectMethods(); 1621 size_t end = declaring_class->NumVirtualMethods(); 1622 bool found = false; 1623 for (size_t i = 0; i < end; i++) { 1624 if (declaring_class->GetVirtualMethod(i) == method) { 1625 found = true; 1626 break; 1627 } 1628 oat_method_index++; 1629 } 1630 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1631 } 1632 DCHECK_EQ(oat_method_index, 1633 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1634 method->GetDeclaringClass()->GetDexClassDefIndex(), 1635 method->GetDexMethodIndex())); 1636 const OatFile::OatClass oat_class = GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1637 declaring_class->GetDexClassDefIndex()); 1638 1639 return oat_class.GetOatMethod(oat_method_index); 1640} 1641 1642// Special case to get oat code without overwriting a trampoline. 1643const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1644 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1645 if (method->IsProxyMethod()) { 1646 return GetQuickProxyInvokeHandler(); 1647 } 1648 const void* result = GetOatMethodFor(method).GetQuickCode(); 1649 if (result == nullptr) { 1650 if (method->IsNative()) { 1651 // No code and native? Use generic trampoline. 1652 result = GetQuickGenericJniTrampoline(); 1653 } else if (method->IsPortableCompiled()) { 1654 // No code? Do we expect portable code? 1655 result = GetQuickToPortableBridge(); 1656 } else { 1657 // No code? You must mean to go into the interpreter. 1658 result = GetQuickToInterpreterBridge(); 1659 } 1660 } 1661 return result; 1662} 1663 1664const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1665 bool* have_portable_code) { 1666 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1667 *have_portable_code = false; 1668 if (method->IsProxyMethod()) { 1669 return GetPortableProxyInvokeHandler(); 1670 } 1671 const OatFile::OatMethod oat_method = GetOatMethodFor(method); 1672 const void* result = oat_method.GetPortableCode(); 1673 if (result == nullptr) { 1674 if (oat_method.GetQuickCode() == nullptr) { 1675 // No code? You must mean to go into the interpreter. 1676 result = GetPortableToInterpreterBridge(); 1677 } else { 1678 // No code? But there's quick code, so use a bridge. 1679 result = GetPortableToQuickBridge(); 1680 } 1681 } else { 1682 *have_portable_code = true; 1683 } 1684 return result; 1685} 1686 1687const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1688 uint32_t method_idx) { 1689 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1690 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1691 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 1692} 1693 1694const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1695 uint32_t method_idx) { 1696 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1697 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1698 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 1699} 1700 1701// Returns true if the method must run with interpreter, false otherwise. 1702static bool NeedsInterpreter(mirror::ArtMethod* method, const void* quick_code, 1703 const void* portable_code) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1704 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1705 // No code: need interpreter. 1706 // May return true for native code, in the case of generic JNI 1707 // DCHECK(!method->IsNative()); 1708 return true; 1709 } 1710#ifdef ART_SEA_IR_MODE 1711 ScopedObjectAccess soa(Thread::Current()); 1712 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1713 LOG(INFO) << "Found " << PrettyMethod(method); 1714 return false; 1715 } 1716#endif 1717 // If interpreter mode is enabled, every method (except native and proxy) must 1718 // be run with interpreter. 1719 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1720 !method->IsNative() && !method->IsProxyMethod(); 1721} 1722 1723void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1724 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1725 if (klass->NumDirectMethods() == 0) { 1726 return; // No direct methods => no static methods. 1727 } 1728 Runtime* runtime = Runtime::Current(); 1729 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1730 return; // OAT file unavailable. 1731 } 1732 const DexFile& dex_file = klass->GetDexFile(); 1733 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 1734 CHECK(dex_class_def != nullptr); 1735 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1736 // There should always be class data if there were direct methods. 1737 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1738 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 1739 ClassDataItemIterator it(dex_file, class_data); 1740 // Skip fields 1741 while (it.HasNextStaticField()) { 1742 it.Next(); 1743 } 1744 while (it.HasNextInstanceField()) { 1745 it.Next(); 1746 } 1747 // Link the code of methods skipped by LinkCode. 1748 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1749 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1750 if (!method->IsStatic()) { 1751 // Only update static methods. 1752 continue; 1753 } 1754 const void* portable_code = oat_class.GetOatMethod(method_index).GetPortableCode(); 1755 const void* quick_code = oat_class.GetOatMethod(method_index).GetQuickCode(); 1756 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1757 bool have_portable_code = false; 1758 if (enter_interpreter) { 1759 // Use interpreter entry point. 1760 // Check whether the method is native, in which case it's generic JNI. 1761 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 1762 quick_code = GetQuickGenericJniTrampoline(); 1763 portable_code = GetPortableToQuickBridge(); 1764 } else { 1765 portable_code = GetPortableToInterpreterBridge(); 1766 quick_code = GetQuickToInterpreterBridge(); 1767 } 1768 } else { 1769 if (portable_code == nullptr) { 1770 portable_code = GetPortableToQuickBridge(); 1771 } else { 1772 have_portable_code = true; 1773 } 1774 if (quick_code == nullptr) { 1775 quick_code = GetQuickToPortableBridge(); 1776 } 1777 } 1778 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1779 have_portable_code); 1780 } 1781 // Ignore virtual methods on the iterator. 1782} 1783 1784void ClassLinker::LinkCode(const Handle<mirror::ArtMethod>& method, 1785 const OatFile::OatClass* oat_class, 1786 const DexFile& dex_file, uint32_t dex_method_index, 1787 uint32_t method_index) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1788 // Method shouldn't have already been linked. 1789 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1790 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1791 // Every kind of method should at least get an invoke stub from the oat_method. 1792 // non-abstract methods also get their code pointers. 1793 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1794 oat_method.LinkMethod(method.Get()); 1795 1796 // Install entry point from interpreter. 1797 Runtime* runtime = Runtime::Current(); 1798 bool enter_interpreter = NeedsInterpreter(method.Get(), 1799 method->GetEntryPointFromQuickCompiledCode(), 1800 method->GetEntryPointFromPortableCompiledCode()); 1801 if (enter_interpreter && !method->IsNative()) { 1802 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1803 } else { 1804 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1805 } 1806 1807 if (method->IsAbstract()) { 1808 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1809 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1810 return; 1811 } 1812 1813 bool have_portable_code = false; 1814 if (method->IsStatic() && !method->IsConstructor()) { 1815 // For static methods excluding the class initializer, install the trampoline. 1816 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1817 // after initializing class (see ClassLinker::InitializeClass method). 1818 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 1819 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 1820 } else if (enter_interpreter) { 1821 if (!method->IsNative()) { 1822 // Set entry point from compiled code if there's no code or in interpreter only mode. 1823 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1824 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1825 } else { 1826 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 1827 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1828 } 1829 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1830 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1831 have_portable_code = true; 1832 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1833 } else { 1834 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1835 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1836 } 1837 1838 if (method->IsNative()) { 1839 // Unregistering restores the dlsym lookup stub. 1840 method->UnregisterNative(Thread::Current()); 1841 1842 if (enter_interpreter) { 1843 // We have a native method here without code. Then it should have either the GenericJni 1844 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 1845 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 1846 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 1847 } 1848 } 1849 1850 // Allow instrumentation its chance to hijack code. 1851 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 1852 method->GetEntryPointFromQuickCompiledCode(), 1853 method->GetEntryPointFromPortableCompiledCode(), 1854 have_portable_code); 1855} 1856 1857void ClassLinker::LoadClass(const DexFile& dex_file, 1858 const DexFile::ClassDef& dex_class_def, 1859 const Handle<mirror::Class>& klass, 1860 mirror::ClassLoader* class_loader) { 1861 CHECK(klass.Get() != NULL); 1862 CHECK(klass->GetDexCache() != NULL); 1863 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1864 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1865 CHECK(descriptor != NULL); 1866 1867 klass->SetClass(GetClassRoot(kJavaLangClass)); 1868 if (kUseBakerOrBrooksReadBarrier) { 1869 klass->AssertReadBarrierPointer(); 1870 } 1871 uint32_t access_flags = dex_class_def.access_flags_; 1872 // Make sure that none of our runtime-only flags are set. 1873 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1874 klass->SetAccessFlags(access_flags); 1875 klass->SetClassLoader(class_loader); 1876 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1877 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1878 1879 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1880 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1881 1882 const byte* class_data = dex_file.GetClassData(dex_class_def); 1883 if (class_data == NULL) { 1884 return; // no fields or methods - for example a marker interface 1885 } 1886 1887 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1888 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 1889 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 1890 } else { 1891 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 1892 } 1893} 1894 1895void ClassLinker::LoadClassMembers(const DexFile& dex_file, 1896 const byte* class_data, 1897 const Handle<mirror::Class>& klass, 1898 mirror::ClassLoader* class_loader, 1899 const OatFile::OatClass* oat_class) { 1900 // Load fields. 1901 ClassDataItemIterator it(dex_file, class_data); 1902 Thread* self = Thread::Current(); 1903 if (it.NumStaticFields() != 0) { 1904 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1905 if (UNLIKELY(statics == NULL)) { 1906 CHECK(self->IsExceptionPending()); // OOME. 1907 return; 1908 } 1909 klass->SetSFields(statics); 1910 } 1911 if (it.NumInstanceFields() != 0) { 1912 mirror::ObjectArray<mirror::ArtField>* fields = 1913 AllocArtFieldArray(self, it.NumInstanceFields()); 1914 if (UNLIKELY(fields == NULL)) { 1915 CHECK(self->IsExceptionPending()); // OOME. 1916 return; 1917 } 1918 klass->SetIFields(fields); 1919 } 1920 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1921 StackHandleScope<1> hs(self); 1922 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 1923 if (UNLIKELY(sfield.Get() == NULL)) { 1924 CHECK(self->IsExceptionPending()); // OOME. 1925 return; 1926 } 1927 klass->SetStaticField(i, sfield.Get()); 1928 LoadField(dex_file, it, klass, sfield); 1929 } 1930 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1931 StackHandleScope<1> hs(self); 1932 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 1933 if (UNLIKELY(ifield.Get() == NULL)) { 1934 CHECK(self->IsExceptionPending()); // OOME. 1935 return; 1936 } 1937 klass->SetInstanceField(i, ifield.Get()); 1938 LoadField(dex_file, it, klass, ifield); 1939 } 1940 1941 // Load methods. 1942 if (it.NumDirectMethods() != 0) { 1943 // TODO: append direct methods to class object 1944 mirror::ObjectArray<mirror::ArtMethod>* directs = 1945 AllocArtMethodArray(self, it.NumDirectMethods()); 1946 if (UNLIKELY(directs == NULL)) { 1947 CHECK(self->IsExceptionPending()); // OOME. 1948 return; 1949 } 1950 klass->SetDirectMethods(directs); 1951 } 1952 if (it.NumVirtualMethods() != 0) { 1953 // TODO: append direct methods to class object 1954 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1955 AllocArtMethodArray(self, it.NumVirtualMethods()); 1956 if (UNLIKELY(virtuals == NULL)) { 1957 CHECK(self->IsExceptionPending()); // OOME. 1958 return; 1959 } 1960 klass->SetVirtualMethods(virtuals); 1961 } 1962 size_t class_def_method_index = 0; 1963 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1964 StackHandleScope<1> hs(self); 1965 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 1966 if (UNLIKELY(method.Get() == NULL)) { 1967 CHECK(self->IsExceptionPending()); // OOME. 1968 return; 1969 } 1970 klass->SetDirectMethod(i, method.Get()); 1971 if (oat_class != nullptr) { 1972 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 1973 } 1974 method->SetMethodIndex(class_def_method_index); 1975 class_def_method_index++; 1976 } 1977 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1978 StackHandleScope<1> hs(self); 1979 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 1980 if (UNLIKELY(method.Get() == NULL)) { 1981 CHECK(self->IsExceptionPending()); // OOME. 1982 return; 1983 } 1984 klass->SetVirtualMethod(i, method.Get()); 1985 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1986 if (oat_class != nullptr) { 1987 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 1988 } 1989 class_def_method_index++; 1990 } 1991 DCHECK(!it.HasNext()); 1992} 1993 1994void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1995 const Handle<mirror::Class>& klass, 1996 const Handle<mirror::ArtField>& dst) { 1997 uint32_t field_idx = it.GetMemberIndex(); 1998 dst->SetDexFieldIndex(field_idx); 1999 dst->SetDeclaringClass(klass.Get()); 2000 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2001} 2002 2003mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2004 const ClassDataItemIterator& it, 2005 const Handle<mirror::Class>& klass) { 2006 uint32_t dex_method_idx = it.GetMemberIndex(); 2007 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2008 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2009 2010 mirror::ArtMethod* dst = AllocArtMethod(self); 2011 if (UNLIKELY(dst == NULL)) { 2012 CHECK(self->IsExceptionPending()); // OOME. 2013 return NULL; 2014 } 2015 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2016 2017 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2018 dst->SetDexMethodIndex(dex_method_idx); 2019 dst->SetDeclaringClass(klass.Get()); 2020 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2021 2022 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2023 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2024 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2025 2026 uint32_t access_flags = it.GetMemberAccessFlags(); 2027 2028 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2029 // Set finalizable flag on declaring class. 2030 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2031 // Void return type. 2032 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 2033 klass->SetFinalizable(); 2034 } else { 2035 std::string klass_descriptor = klass->GetDescriptor(); 2036 // The Enum class declares a "final" finalize() method to prevent subclasses from 2037 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2038 // subclasses, so we exclude it here. 2039 // We also want to avoid setting the flag on Object, where we know that finalize() is 2040 // empty. 2041 if (klass_descriptor.compare("Ljava/lang/Object;") != 0 && 2042 klass_descriptor.compare("Ljava/lang/Enum;") != 0) { 2043 klass->SetFinalizable(); 2044 } 2045 } 2046 } 2047 } else if (method_name[0] == '<') { 2048 // Fix broken access flags for initializers. Bug 11157540. 2049 bool is_init = (strcmp("<init>", method_name) == 0); 2050 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2051 if (UNLIKELY(!is_init && !is_clinit)) { 2052 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2053 } else { 2054 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2055 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2056 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2057 access_flags |= kAccConstructor; 2058 } 2059 } 2060 } 2061 dst->SetAccessFlags(access_flags); 2062 2063 self->EndAssertNoThreadSuspension(old_cause); 2064 return dst; 2065} 2066 2067void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2068 Thread* self = Thread::Current(); 2069 StackHandleScope<1> hs(self); 2070 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2071 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2072 AppendToBootClassPath(dex_file, dex_cache); 2073} 2074 2075void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2076 const Handle<mirror::DexCache>& dex_cache) { 2077 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2078 boot_class_path_.push_back(&dex_file); 2079 RegisterDexFile(dex_file, dex_cache); 2080} 2081 2082bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 2083 dex_lock_.AssertSharedHeld(Thread::Current()); 2084 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2085 if (dex_caches_[i]->GetDexFile() == &dex_file) { 2086 return true; 2087 } 2088 } 2089 return false; 2090} 2091 2092bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 2093 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2094 return IsDexFileRegisteredLocked(dex_file); 2095} 2096 2097void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2098 const Handle<mirror::DexCache>& dex_cache) { 2099 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2100 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2101 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2102 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2103 dex_caches_.push_back(dex_cache.Get()); 2104 dex_cache->SetDexFile(&dex_file); 2105 if (log_new_dex_caches_roots_) { 2106 // TODO: This is not safe if we can remove dex caches. 2107 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2108 } 2109} 2110 2111void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2112 Thread* self = Thread::Current(); 2113 { 2114 ReaderMutexLock mu(self, dex_lock_); 2115 if (IsDexFileRegisteredLocked(dex_file)) { 2116 return; 2117 } 2118 } 2119 // Don't alloc while holding the lock, since allocation may need to 2120 // suspend all threads and another thread may need the dex_lock_ to 2121 // get to a suspend point. 2122 StackHandleScope<1> hs(self); 2123 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2124 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2125 { 2126 WriterMutexLock mu(self, dex_lock_); 2127 if (IsDexFileRegisteredLocked(dex_file)) { 2128 return; 2129 } 2130 RegisterDexFileLocked(dex_file, dex_cache); 2131 } 2132} 2133 2134void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2135 const Handle<mirror::DexCache>& dex_cache) { 2136 WriterMutexLock mu(Thread::Current(), dex_lock_); 2137 RegisterDexFileLocked(dex_file, dex_cache); 2138} 2139 2140mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 2141 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2142 // Search assuming unique-ness of dex file. 2143 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2144 mirror::DexCache* dex_cache = dex_caches_[i]; 2145 if (dex_cache->GetDexFile() == &dex_file) { 2146 return dex_cache; 2147 } 2148 } 2149 // Search matching by location name. 2150 std::string location(dex_file.GetLocation()); 2151 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2152 mirror::DexCache* dex_cache = dex_caches_[i]; 2153 if (dex_cache->GetDexFile()->GetLocation() == location) { 2154 return dex_cache; 2155 } 2156 } 2157 // Failure, dump diagnostic and abort. 2158 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2159 mirror::DexCache* dex_cache = dex_caches_[i]; 2160 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2161 } 2162 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2163 return NULL; 2164} 2165 2166void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 2167 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2168 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2169 dex_caches_[i]->Fixup(resolution_method); 2170 } 2171} 2172 2173mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2174 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2175 if (UNLIKELY(klass == NULL)) { 2176 return NULL; 2177 } 2178 return InitializePrimitiveClass(klass, type); 2179} 2180 2181mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2182 Primitive::Type type) { 2183 CHECK(primitive_class != NULL); 2184 // Must hold lock on object when initializing. 2185 Thread* self = Thread::Current(); 2186 StackHandleScope<1> hs(self); 2187 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2188 ObjectLock<mirror::Class> lock(self, h_class); 2189 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2190 primitive_class->SetPrimitiveType(type); 2191 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2192 const char* descriptor = Primitive::Descriptor(type); 2193 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2194 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2195 return primitive_class; 2196} 2197 2198// Create an array class (i.e. the class object for the array, not the 2199// array itself). "descriptor" looks like "[C" or "[[[[B" or 2200// "[Ljava/lang/String;". 2201// 2202// If "descriptor" refers to an array of primitives, look up the 2203// primitive type's internally-generated class object. 2204// 2205// "class_loader" is the class loader of the class that's referring to 2206// us. It's used to ensure that we're looking for the element type in 2207// the right context. It does NOT become the class loader for the 2208// array class; that always comes from the base element class. 2209// 2210// Returns NULL with an exception raised on failure. 2211mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2212 const Handle<mirror::ClassLoader>& class_loader) { 2213 // Identify the underlying component type 2214 CHECK_EQ('[', descriptor[0]); 2215 StackHandleScope<2> hs(self); 2216 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2217 if (component_type.Get() == nullptr) { 2218 DCHECK(self->IsExceptionPending()); 2219 return nullptr; 2220 } 2221 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2222 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2223 return nullptr; 2224 } 2225 // See if the component type is already loaded. Array classes are 2226 // always associated with the class loader of their underlying 2227 // element type -- an array of Strings goes with the loader for 2228 // java/lang/String -- so we need to look for it there. (The 2229 // caller should have checked for the existence of the class 2230 // before calling here, but they did so with *their* class loader, 2231 // not the component type's loader.) 2232 // 2233 // If we find it, the caller adds "loader" to the class' initiating 2234 // loader list, which should prevent us from going through this again. 2235 // 2236 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2237 // are the same, because our caller (FindClass) just did the 2238 // lookup. (Even if we get this wrong we still have correct behavior, 2239 // because we effectively do this lookup again when we add the new 2240 // class to the hash table --- necessary because of possible races with 2241 // other threads.) 2242 if (class_loader.Get() != component_type->GetClassLoader()) { 2243 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2244 if (new_class != NULL) { 2245 return new_class; 2246 } 2247 } 2248 2249 // Fill out the fields in the Class. 2250 // 2251 // It is possible to execute some methods against arrays, because 2252 // all arrays are subclasses of java_lang_Object_, so we need to set 2253 // up a vtable. We can just point at the one in java_lang_Object_. 2254 // 2255 // Array classes are simple enough that we don't need to do a full 2256 // link step. 2257 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2258 if (UNLIKELY(!init_done_)) { 2259 // Classes that were hand created, ie not by FindSystemClass 2260 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2261 new_class.Assign(GetClassRoot(kClassArrayClass)); 2262 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2263 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2264 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2265 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2266 } else if (strcmp(descriptor, 2267 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2268 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2269 } else if (strcmp(descriptor, 2270 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2271 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2272 } else if (strcmp(descriptor, "[C") == 0) { 2273 new_class.Assign(GetClassRoot(kCharArrayClass)); 2274 } else if (strcmp(descriptor, "[I") == 0) { 2275 new_class.Assign(GetClassRoot(kIntArrayClass)); 2276 } 2277 } 2278 if (new_class.Get() == nullptr) { 2279 new_class.Assign(AllocClass(self, sizeof(mirror::Class))); 2280 if (new_class.Get() == nullptr) { 2281 return nullptr; 2282 } 2283 new_class->SetComponentType(component_type.Get()); 2284 } 2285 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2286 DCHECK(new_class->GetComponentType() != NULL); 2287 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2288 new_class->SetSuperClass(java_lang_Object); 2289 new_class->SetVTable(java_lang_Object->GetVTable()); 2290 new_class->SetPrimitiveType(Primitive::kPrimNot); 2291 new_class->SetClassLoader(component_type->GetClassLoader()); 2292 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2293 // don't need to set new_class->SetObjectSize(..) 2294 // because Object::SizeOf delegates to Array::SizeOf 2295 2296 2297 // All arrays have java/lang/Cloneable and java/io/Serializable as 2298 // interfaces. We need to set that up here, so that stuff like 2299 // "instanceof" works right. 2300 // 2301 // Note: The GC could run during the call to FindSystemClass, 2302 // so we need to make sure the class object is GC-valid while we're in 2303 // there. Do this by clearing the interface list so the GC will just 2304 // think that the entries are null. 2305 2306 2307 // Use the single, global copies of "interfaces" and "iftable" 2308 // (remember not to free them for arrays). 2309 CHECK(array_iftable_ != nullptr); 2310 new_class->SetIfTable(array_iftable_); 2311 2312 // Inherit access flags from the component type. 2313 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2314 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2315 access_flags &= kAccJavaFlagsMask; 2316 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2317 // and remove "interface". 2318 access_flags |= kAccAbstract | kAccFinal; 2319 access_flags &= ~kAccInterface; 2320 2321 new_class->SetAccessFlags(access_flags); 2322 2323 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2324 if (existing == nullptr) { 2325 return new_class.Get(); 2326 } 2327 // Another thread must have loaded the class after we 2328 // started but before we finished. Abandon what we've 2329 // done. 2330 // 2331 // (Yes, this happens.) 2332 2333 return existing; 2334} 2335 2336mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2337 switch (type) { 2338 case 'B': 2339 return GetClassRoot(kPrimitiveByte); 2340 case 'C': 2341 return GetClassRoot(kPrimitiveChar); 2342 case 'D': 2343 return GetClassRoot(kPrimitiveDouble); 2344 case 'F': 2345 return GetClassRoot(kPrimitiveFloat); 2346 case 'I': 2347 return GetClassRoot(kPrimitiveInt); 2348 case 'J': 2349 return GetClassRoot(kPrimitiveLong); 2350 case 'S': 2351 return GetClassRoot(kPrimitiveShort); 2352 case 'Z': 2353 return GetClassRoot(kPrimitiveBoolean); 2354 case 'V': 2355 return GetClassRoot(kPrimitiveVoid); 2356 default: 2357 break; 2358 } 2359 std::string printable_type(PrintableChar(type)); 2360 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2361 return NULL; 2362} 2363 2364mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2365 size_t hash) { 2366 if (VLOG_IS_ON(class_linker)) { 2367 mirror::DexCache* dex_cache = klass->GetDexCache(); 2368 std::string source; 2369 if (dex_cache != NULL) { 2370 source += " from "; 2371 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2372 } 2373 LOG(INFO) << "Loaded class " << descriptor << source; 2374 } 2375 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2376 mirror::Class* existing = 2377 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2378 if (existing != NULL) { 2379 return existing; 2380 } 2381 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2382 // Check a class loaded with the system class loader matches one in the image if the class 2383 // is in the image. 2384 existing = LookupClassFromImage(descriptor); 2385 if (existing != NULL) { 2386 CHECK(klass == existing); 2387 } 2388 } 2389 VerifyObject(klass); 2390 class_table_.insert(std::make_pair(hash, klass)); 2391 if (log_new_class_table_roots_) { 2392 new_class_roots_.push_back(std::make_pair(hash, klass)); 2393 } 2394 return NULL; 2395} 2396 2397bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2398 size_t hash = Hash(descriptor); 2399 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2400 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2401 ++it) { 2402 mirror::Class* klass = it->second; 2403 if (klass->GetClassLoader() == class_loader && descriptor == klass->GetDescriptor()) { 2404 class_table_.erase(it); 2405 return true; 2406 } 2407 } 2408 return false; 2409} 2410 2411mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2412 const mirror::ClassLoader* class_loader) { 2413 size_t hash = Hash(descriptor); 2414 { 2415 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2416 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2417 if (result != NULL) { 2418 return result; 2419 } 2420 } 2421 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2422 return NULL; 2423 } else { 2424 // Lookup failed but need to search dex_caches_. 2425 mirror::Class* result = LookupClassFromImage(descriptor); 2426 if (result != NULL) { 2427 InsertClass(descriptor, result, hash); 2428 } else { 2429 // Searching the image dex files/caches failed, we don't want to get into this situation 2430 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2431 // classes into the class table. 2432 const int32_t kMaxFailedDexCacheLookups = 1000; 2433 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2434 MoveImageClassesToClassTable(); 2435 } 2436 } 2437 return result; 2438 } 2439} 2440 2441mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2442 const mirror::ClassLoader* class_loader, 2443 size_t hash) { 2444 auto end = class_table_.end(); 2445 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2446 mirror::Class* klass = it->second; 2447 if (klass->GetClassLoader() == class_loader && descriptor == klass->GetDescriptor()) { 2448 if (kIsDebugBuild) { 2449 // Check for duplicates in the table. 2450 for (++it; it != end && it->first == hash; ++it) { 2451 mirror::Class* klass2 = it->second; 2452 CHECK(!((klass2->GetClassLoader() == class_loader) && 2453 descriptor == klass2->GetDescriptor())) 2454 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2455 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2456 } 2457 } 2458 return klass; 2459 } 2460 } 2461 return NULL; 2462} 2463 2464static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2465 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2466 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2467 CHECK(image != NULL); 2468 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2469 return root->AsObjectArray<mirror::DexCache>(); 2470} 2471 2472void ClassLinker::MoveImageClassesToClassTable() { 2473 Thread* self = Thread::Current(); 2474 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2475 if (!dex_cache_image_class_lookup_required_) { 2476 return; // All dex cache classes are already in the class table. 2477 } 2478 const char* old_no_suspend_cause = 2479 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2480 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2481 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2482 mirror::DexCache* dex_cache = dex_caches->Get(i); 2483 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2484 for (int32_t j = 0; j < types->GetLength(); j++) { 2485 mirror::Class* klass = types->Get(j); 2486 if (klass != NULL) { 2487 DCHECK(klass->GetClassLoader() == NULL); 2488 std::string descriptor = klass->GetDescriptor(); 2489 size_t hash = Hash(descriptor.c_str()); 2490 mirror::Class* existing = LookupClassFromTableLocked(descriptor.c_str(), NULL, hash); 2491 if (existing != NULL) { 2492 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2493 << PrettyClassAndClassLoader(klass); 2494 } else { 2495 class_table_.insert(std::make_pair(hash, klass)); 2496 if (log_new_class_table_roots_) { 2497 new_class_roots_.push_back(std::make_pair(hash, klass)); 2498 } 2499 } 2500 } 2501 } 2502 } 2503 dex_cache_image_class_lookup_required_ = false; 2504 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2505} 2506 2507mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2508 Thread* self = Thread::Current(); 2509 const char* old_no_suspend_cause = 2510 self->StartAssertNoThreadSuspension("Image class lookup"); 2511 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2512 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2513 mirror::DexCache* dex_cache = dex_caches->Get(i); 2514 const DexFile* dex_file = dex_cache->GetDexFile(); 2515 // Try binary searching the string/type index. 2516 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2517 if (string_id != NULL) { 2518 const DexFile::TypeId* type_id = 2519 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2520 if (type_id != NULL) { 2521 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2522 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2523 if (klass != NULL) { 2524 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2525 return klass; 2526 } 2527 } 2528 } 2529 } 2530 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2531 return NULL; 2532} 2533 2534void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2535 result.clear(); 2536 if (dex_cache_image_class_lookup_required_) { 2537 MoveImageClassesToClassTable(); 2538 } 2539 size_t hash = Hash(descriptor); 2540 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2541 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2542 it != end && it->first == hash; ++it) { 2543 mirror::Class* klass = it->second; 2544 if (descriptor == klass->GetDescriptor()) { 2545 result.push_back(klass); 2546 } 2547 } 2548} 2549 2550void ClassLinker::VerifyClass(const Handle<mirror::Class>& klass) { 2551 // TODO: assert that the monitor on the Class is held 2552 Thread* self = Thread::Current(); 2553 ObjectLock<mirror::Class> lock(self, klass); 2554 2555 // Don't attempt to re-verify if already sufficiently verified. 2556 if (klass->IsVerified() || 2557 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2558 return; 2559 } 2560 2561 // The class might already be erroneous, for example at compile time if we attempted to verify 2562 // this class as a parent to another. 2563 if (klass->IsErroneous()) { 2564 ThrowEarlierClassFailure(klass.Get()); 2565 return; 2566 } 2567 2568 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2569 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2570 } else { 2571 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2572 << PrettyClass(klass.Get()); 2573 CHECK(!Runtime::Current()->IsCompiler()); 2574 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2575 } 2576 2577 // Skip verification if disabled. 2578 if (!Runtime::Current()->IsVerificationEnabled()) { 2579 klass->SetStatus(mirror::Class::kStatusVerified, self); 2580 return; 2581 } 2582 2583 // Verify super class. 2584 StackHandleScope<2> hs(self); 2585 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 2586 if (super.Get() != NULL) { 2587 // Acquire lock to prevent races on verifying the super class. 2588 ObjectLock<mirror::Class> lock(self, super); 2589 2590 if (!super->IsVerified() && !super->IsErroneous()) { 2591 VerifyClass(super); 2592 } 2593 if (!super->IsCompileTimeVerified()) { 2594 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2595 PrettyDescriptor(klass.Get()).c_str(), 2596 PrettyDescriptor(super.Get()).c_str())); 2597 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2598 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 2599 if (cause.Get() != nullptr) { 2600 self->ClearException(); 2601 } 2602 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2603 if (cause.Get() != nullptr) { 2604 self->GetException(nullptr)->SetCause(cause.Get()); 2605 } 2606 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2607 if (Runtime::Current()->IsCompiler()) { 2608 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2609 } 2610 klass->SetStatus(mirror::Class::kStatusError, self); 2611 return; 2612 } 2613 } 2614 2615 // Try to use verification information from the oat file, otherwise do runtime verification. 2616 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2617 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2618 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 2619 if (oat_file_class_status == mirror::Class::kStatusError) { 2620 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2621 << PrettyDescriptor(klass.Get()) << " in " 2622 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2623 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 2624 PrettyDescriptor(klass.Get()).c_str()); 2625 klass->SetStatus(mirror::Class::kStatusError, self); 2626 return; 2627 } 2628 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2629 std::string error_msg; 2630 if (!preverified) { 2631 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 2632 Runtime::Current()->IsCompiler(), 2633 &error_msg); 2634 } 2635 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2636 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2637 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 2638 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2639 << " because: " << error_msg; 2640 } 2641 self->AssertNoPendingException(); 2642 // Make sure all classes referenced by catch blocks are resolved. 2643 ResolveClassExceptionHandlerTypes(dex_file, klass); 2644 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2645 // Even though there were no verifier failures we need to respect whether the super-class 2646 // was verified or requiring runtime reverification. 2647 if (super.Get() == NULL || super->IsVerified()) { 2648 klass->SetStatus(mirror::Class::kStatusVerified, self); 2649 } else { 2650 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2651 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2652 // Pretend a soft failure occured so that we don't consider the class verified below. 2653 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2654 } 2655 } else { 2656 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2657 // Soft failures at compile time should be retried at runtime. Soft 2658 // failures at runtime will be handled by slow paths in the generated 2659 // code. Set status accordingly. 2660 if (Runtime::Current()->IsCompiler()) { 2661 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2662 } else { 2663 klass->SetStatus(mirror::Class::kStatusVerified, self); 2664 } 2665 } 2666 } else { 2667 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 2668 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2669 << " because: " << error_msg; 2670 self->AssertNoPendingException(); 2671 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2672 klass->SetStatus(mirror::Class::kStatusError, self); 2673 } 2674 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2675 // Class is verified so we don't need to do any access check on its methods. 2676 // Let the interpreter know it by setting the kAccPreverified flag onto each 2677 // method. 2678 // Note: we're going here during compilation and at runtime. When we set the 2679 // kAccPreverified flag when compiling image classes, the flag is recorded 2680 // in the image and is set when loading the image. 2681 klass->SetPreverifiedFlagOnAllMethods(); 2682 } 2683} 2684 2685bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2686 mirror::Class::Status& oat_file_class_status) { 2687 // If we're compiling, we can only verify the class using the oat file if 2688 // we are not compiling the image or if the class we're verifying is not part of 2689 // the app. In other words, we will only check for preverification of bootclasspath 2690 // classes. 2691 if (Runtime::Current()->IsCompiler()) { 2692 // Are we compiling the bootclasspath? 2693 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2694 return false; 2695 } 2696 // We are compiling an app (not the image). 2697 2698 // Is this an app class? (I.e. not a bootclasspath class) 2699 if (klass->GetClassLoader() != NULL) { 2700 return false; 2701 } 2702 } 2703 2704 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2705 // Make this work with gtests, which do not set up the image properly. 2706 // TODO: we should clean up gtests to set up the image path properly. 2707 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2708 return false; 2709 } 2710 2711 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2712 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2713 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2714 &dex_location_checksum); 2715 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2716 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2717 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 2718 if (oat_file_class_status == mirror::Class::kStatusVerified || 2719 oat_file_class_status == mirror::Class::kStatusInitialized) { 2720 return true; 2721 } 2722 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2723 // Compile time verification failed with a soft error. Compile time verification can fail 2724 // because we have incomplete type information. Consider the following: 2725 // class ... { 2726 // Foo x; 2727 // .... () { 2728 // if (...) { 2729 // v1 gets assigned a type of resolved class Foo 2730 // } else { 2731 // v1 gets assigned a type of unresolved class Bar 2732 // } 2733 // iput x = v1 2734 // } } 2735 // when we merge v1 following the if-the-else it results in Conflict 2736 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2737 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2738 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2739 // at compile time). 2740 return false; 2741 } 2742 if (oat_file_class_status == mirror::Class::kStatusError) { 2743 // Compile time verification failed with a hard error. This is caused by invalid instructions 2744 // in the class. These errors are unrecoverable. 2745 return false; 2746 } 2747 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2748 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2749 // not loading the class. 2750 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2751 // isn't a problem and this case shouldn't occur 2752 return false; 2753 } 2754 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2755 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2756 << klass->GetDescriptor(); 2757 2758 return false; 2759} 2760 2761void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2762 const Handle<mirror::Class>& klass) { 2763 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2764 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2765 } 2766 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2767 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2768 } 2769} 2770 2771void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2772 mirror::ArtMethod* method) { 2773 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2774 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2775 if (code_item == NULL) { 2776 return; // native or abstract method 2777 } 2778 if (code_item->tries_size_ == 0) { 2779 return; // nothing to process 2780 } 2781 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2782 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2783 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2784 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2785 CatchHandlerIterator iterator(handlers_ptr); 2786 for (; iterator.HasNext(); iterator.Next()) { 2787 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2788 // unresolved exception types will be ignored by exception delivery 2789 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2790 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2791 if (exception_type == NULL) { 2792 DCHECK(Thread::Current()->IsExceptionPending()); 2793 Thread::Current()->ClearException(); 2794 } 2795 } 2796 } 2797 handlers_ptr = iterator.EndDataPointer(); 2798 } 2799} 2800 2801static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2802static void CheckProxyMethod(mirror::ArtMethod* method, 2803 Handle<mirror::ArtMethod>& prototype); 2804 2805mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 2806 jobjectArray interfaces, jobject loader, 2807 jobjectArray methods, jobjectArray throws) { 2808 Thread* self = soa.Self(); 2809 StackHandleScope<8> hs(self); 2810 Handle<mirror::Class> klass(hs.NewHandle(AllocClass(self, GetClassRoot(kJavaLangClass), 2811 sizeof(mirror::SynthesizedProxyClass)))); 2812 if (klass.Get() == NULL) { 2813 CHECK(self->IsExceptionPending()); // OOME. 2814 return NULL; 2815 } 2816 DCHECK(klass->GetClass() != NULL); 2817 klass->SetObjectSize(sizeof(mirror::Proxy)); 2818 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2819 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2820 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2821 klass->SetName(soa.Decode<mirror::String*>(name)); 2822 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2823 klass->SetDexCache(proxy_class->GetDexCache()); 2824 klass->SetStatus(mirror::Class::kStatusIdx, self); 2825 2826 // Instance fields are inherited, but we add a couple of static fields... 2827 { 2828 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2829 if (UNLIKELY(sfields == NULL)) { 2830 CHECK(self->IsExceptionPending()); // OOME. 2831 return NULL; 2832 } 2833 klass->SetSFields(sfields); 2834 } 2835 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2836 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2837 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 2838 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 2839 CHECK(self->IsExceptionPending()); // OOME. 2840 return nullptr; 2841 } 2842 klass->SetStaticField(0, interfaces_sfield.Get()); 2843 interfaces_sfield->SetDexFieldIndex(0); 2844 interfaces_sfield->SetDeclaringClass(klass.Get()); 2845 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2846 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2847 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 2848 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 2849 CHECK(self->IsExceptionPending()); // OOME. 2850 return nullptr; 2851 } 2852 klass->SetStaticField(1, throws_sfield.Get()); 2853 throws_sfield->SetDexFieldIndex(1); 2854 throws_sfield->SetDeclaringClass(klass.Get()); 2855 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2856 2857 // Proxies have 1 direct method, the constructor 2858 { 2859 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 2860 if (UNLIKELY(directs == nullptr)) { 2861 CHECK(self->IsExceptionPending()); // OOME. 2862 return nullptr; 2863 } 2864 klass->SetDirectMethods(directs); 2865 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2866 if (UNLIKELY(constructor == nullptr)) { 2867 CHECK(self->IsExceptionPending()); // OOME. 2868 return nullptr; 2869 } 2870 klass->SetDirectMethod(0, constructor); 2871 } 2872 2873 // Create virtual method using specified prototypes. 2874 size_t num_virtual_methods = 2875 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 2876 { 2877 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, num_virtual_methods); 2878 if (UNLIKELY(virtuals == NULL)) { 2879 CHECK(self->IsExceptionPending()); // OOME. 2880 return NULL; 2881 } 2882 klass->SetVirtualMethods(virtuals); 2883 } 2884 for (size_t i = 0; i < num_virtual_methods; ++i) { 2885 StackHandleScope<1> hs(self); 2886 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2887 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2888 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 2889 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2890 if (UNLIKELY(clone == nullptr)) { 2891 CHECK(self->IsExceptionPending()); // OOME. 2892 return nullptr; 2893 } 2894 klass->SetVirtualMethod(i, clone); 2895 } 2896 2897 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2898 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Class is now effectively in the loaded state 2899 self->AssertNoPendingException(); 2900 2901 { 2902 ObjectLock<mirror::Class> lock(self, klass); // Must hold lock on object when resolved. 2903 // Link the fields and virtual methods, creating vtable and iftables 2904 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 2905 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 2906 if (!LinkClass(self, klass, h_interfaces)) { 2907 klass->SetStatus(mirror::Class::kStatusError, self); 2908 return nullptr; 2909 } 2910 2911 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2912 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2913 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2914 } 2915 2916 // sanity checks 2917 if (kIsDebugBuild) { 2918 CHECK(klass->GetIFields() == nullptr); 2919 CheckProxyConstructor(klass->GetDirectMethod(0)); 2920 for (size_t i = 0; i < num_virtual_methods; ++i) { 2921 StackHandleScope<1> hs(self); 2922 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2923 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2924 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 2925 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2926 } 2927 2928 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 2929 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2930 decoded_name->ToModifiedUtf8().c_str())); 2931 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2932 2933 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2934 decoded_name->ToModifiedUtf8().c_str())); 2935 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2936 2937 mirror::SynthesizedProxyClass* synth_proxy_class = 2938 down_cast<mirror::SynthesizedProxyClass*>(klass.Get()); 2939 CHECK_EQ(synth_proxy_class->GetInterfaces(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2940 CHECK_EQ(synth_proxy_class->GetThrows(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2941 } 2942 std::string descriptor(GetDescriptorForProxy(klass.Get())); 2943 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 2944 CHECK(existing == nullptr); 2945 return klass.Get(); 2946} 2947 2948std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 2949 DCHECK(proxy_class->IsProxyClass()); 2950 mirror::String* name = proxy_class->GetName(); 2951 DCHECK(name != NULL); 2952 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2953} 2954 2955mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 2956 mirror::ArtMethod* proxy_method) { 2957 DCHECK(proxy_class->IsProxyClass()); 2958 DCHECK(proxy_method->IsProxyMethod()); 2959 // Locate the dex cache of the original interface/Object 2960 mirror::DexCache* dex_cache = NULL; 2961 { 2962 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2963 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2964 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2965 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2966 dex_cache = dex_caches_[i]; 2967 break; 2968 } 2969 } 2970 } 2971 CHECK(dex_cache != NULL); 2972 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2973 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2974 CHECK(resolved_method != NULL); 2975 return resolved_method; 2976} 2977 2978 2979mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2980 const Handle<mirror::Class>& klass, 2981 mirror::Class* proxy_class) { 2982 // Create constructor for Proxy that must initialize h 2983 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2984 proxy_class->GetDirectMethods(); 2985 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2986 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2987 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2988 // code_ too) 2989 mirror::ArtMethod* constructor = 2990 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2991 if (constructor == NULL) { 2992 CHECK(self->IsExceptionPending()); // OOME. 2993 return NULL; 2994 } 2995 // Make this constructor public and fix the class to be our Proxy version 2996 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2997 constructor->SetDeclaringClass(klass.Get()); 2998 return constructor; 2999} 3000 3001static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3002 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3003 CHECK(constructor->IsConstructor()); 3004 MethodHelper mh(constructor); 3005 CHECK_STREQ(mh.GetName(), "<init>"); 3006 CHECK_STREQ(mh.GetSignature().ToString().c_str(), "(Ljava/lang/reflect/InvocationHandler;)V"); 3007 DCHECK(constructor->IsPublic()); 3008} 3009 3010mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3011 const Handle<mirror::Class>& klass, 3012 const Handle<mirror::ArtMethod>& prototype) { 3013 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3014 // prototype method 3015 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3016 prototype.Get()); 3017 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3018 // as necessary 3019 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3020 if (UNLIKELY(method == NULL)) { 3021 CHECK(self->IsExceptionPending()); // OOME. 3022 return NULL; 3023 } 3024 3025 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3026 // the intersection of throw exceptions as defined in Proxy 3027 method->SetDeclaringClass(klass.Get()); 3028 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3029 3030 // At runtime the method looks like a reference and argument saving method, clone the code 3031 // related parameters from this method. 3032 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3033 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3034 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3035 3036 return method; 3037} 3038 3039static void CheckProxyMethod(mirror::ArtMethod* method, 3040 Handle<mirror::ArtMethod>& prototype) 3041 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3042 // Basic sanity 3043 CHECK(!prototype->IsFinal()); 3044 CHECK(method->IsFinal()); 3045 CHECK(!method->IsAbstract()); 3046 3047 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3048 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3049 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3050 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 3051 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 3052 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3053 3054 MethodHelper mh(method); 3055 MethodHelper mh2(prototype.Get()); 3056 CHECK_STREQ(mh.GetName(), mh2.GetName()); 3057 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 3058 // More complex sanity - via dex cache 3059 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3060} 3061 3062static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3063 bool can_init_parents) 3064 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3065 if (can_init_statics && can_init_parents) { 3066 return true; 3067 } 3068 if (!can_init_statics) { 3069 // Check if there's a class initializer. 3070 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3071 if (clinit != NULL) { 3072 return false; 3073 } 3074 // Check if there are encoded static values needing initialization. 3075 if (klass->NumStaticFields() != 0) { 3076 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3077 DCHECK(dex_class_def != NULL); 3078 if (dex_class_def->static_values_off_ != 0) { 3079 return false; 3080 } 3081 } 3082 } 3083 if (!klass->IsInterface() && klass->HasSuperClass()) { 3084 mirror::Class* super_class = klass->GetSuperClass(); 3085 if (!can_init_parents && !super_class->IsInitialized()) { 3086 return false; 3087 } else { 3088 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3089 return false; 3090 } 3091 } 3092 } 3093 return true; 3094} 3095 3096bool ClassLinker::IsInitialized() const { 3097 return init_done_; 3098} 3099 3100bool ClassLinker::InitializeClass(const Handle<mirror::Class>& klass, bool can_init_statics, 3101 bool can_init_parents) { 3102 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3103 3104 // Are we already initialized and therefore done? 3105 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3106 // an initialized class will never change its state. 3107 if (klass->IsInitialized()) { 3108 return true; 3109 } 3110 3111 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3112 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3113 return false; 3114 } 3115 3116 Thread* self = Thread::Current(); 3117 uint64_t t0; 3118 { 3119 ObjectLock<mirror::Class> lock(self, klass); 3120 3121 // Re-check under the lock in case another thread initialized ahead of us. 3122 if (klass->IsInitialized()) { 3123 return true; 3124 } 3125 3126 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3127 if (klass->IsErroneous()) { 3128 ThrowEarlierClassFailure(klass.Get()); 3129 return false; 3130 } 3131 3132 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3133 3134 if (!klass->IsVerified()) { 3135 VerifyClass(klass); 3136 if (!klass->IsVerified()) { 3137 // We failed to verify, expect either the klass to be erroneous or verification failed at 3138 // compile time. 3139 if (klass->IsErroneous()) { 3140 CHECK(self->IsExceptionPending()); 3141 } else { 3142 CHECK(Runtime::Current()->IsCompiler()); 3143 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3144 } 3145 return false; 3146 } 3147 } 3148 3149 // If the class is kStatusInitializing, either this thread is 3150 // initializing higher up the stack or another thread has beat us 3151 // to initializing and we need to wait. Either way, this 3152 // invocation of InitializeClass will not be responsible for 3153 // running <clinit> and will return. 3154 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3155 // We caught somebody else in the act; was it us? 3156 if (klass->GetClinitThreadId() == self->GetTid()) { 3157 // Yes. That's fine. Return so we can continue initializing. 3158 return true; 3159 } 3160 // No. That's fine. Wait for another thread to finish initializing. 3161 return WaitForInitializeClass(klass, self, lock); 3162 } 3163 3164 if (!ValidateSuperClassDescriptors(klass)) { 3165 klass->SetStatus(mirror::Class::kStatusError, self); 3166 return false; 3167 } 3168 3169 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3170 3171 // From here out other threads may observe that we're initializing and so changes of state 3172 // require the a notification. 3173 klass->SetClinitThreadId(self->GetTid()); 3174 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3175 3176 t0 = NanoTime(); 3177 } 3178 3179 // Initialize super classes, must be done while initializing for the JLS. 3180 if (!klass->IsInterface() && klass->HasSuperClass()) { 3181 mirror::Class* super_class = klass->GetSuperClass(); 3182 if (!super_class->IsInitialized()) { 3183 CHECK(!super_class->IsInterface()); 3184 CHECK(can_init_parents); 3185 StackHandleScope<1> hs(self); 3186 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3187 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3188 if (!super_initialized) { 3189 // The super class was verified ahead of entering initializing, we should only be here if 3190 // the super class became erroneous due to initialization. 3191 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3192 << "Super class initialization failed for " << PrettyDescriptor(handle_scope_super.Get()) 3193 << " that has unexpected status " << handle_scope_super->GetStatus() 3194 << "\nPending exception:\n" 3195 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3196 ObjectLock<mirror::Class> lock(self, klass); 3197 // Initialization failed because the super-class is erroneous. 3198 klass->SetStatus(mirror::Class::kStatusError, self); 3199 return false; 3200 } 3201 } 3202 } 3203 3204 if (klass->NumStaticFields() > 0) { 3205 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3206 CHECK(dex_class_def != NULL); 3207 const DexFile& dex_file = klass->GetDexFile(); 3208 StackHandleScope<2> hs(self); 3209 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3210 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3211 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3212 this, *dex_class_def); 3213 if (it.HasNext()) { 3214 CHECK(can_init_statics); 3215 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 3216 SafeMap<uint32_t, mirror::ArtField*> field_map; 3217 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3218 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3219 if (Runtime::Current()->IsActiveTransaction()) { 3220 it.ReadValueToField<true>(field_map.Get(i)); 3221 } else { 3222 it.ReadValueToField<false>(field_map.Get(i)); 3223 } 3224 } 3225 } 3226 } 3227 3228 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3229 if (clinit != NULL) { 3230 CHECK(can_init_statics); 3231 JValue result; 3232 clinit->Invoke(self, NULL, 0, &result, "V"); 3233 } 3234 3235 uint64_t t1 = NanoTime(); 3236 3237 bool success = true; 3238 { 3239 ObjectLock<mirror::Class> lock(self, klass); 3240 3241 if (self->IsExceptionPending()) { 3242 WrapExceptionInInitializer(); 3243 klass->SetStatus(mirror::Class::kStatusError, self); 3244 success = false; 3245 } else { 3246 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3247 RuntimeStats* thread_stats = self->GetStats(); 3248 ++global_stats->class_init_count; 3249 ++thread_stats->class_init_count; 3250 global_stats->class_init_time_ns += (t1 - t0); 3251 thread_stats->class_init_time_ns += (t1 - t0); 3252 // Set the class as initialized except if failed to initialize static fields. 3253 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3254 if (VLOG_IS_ON(class_linker)) { 3255 LOG(INFO) << "Initialized class " << klass->GetDescriptor() << " from " << 3256 klass->GetLocation(); 3257 } 3258 // Opportunistically set static method trampolines to their destination. 3259 FixupStaticTrampolines(klass.Get()); 3260 } 3261 } 3262 return success; 3263} 3264 3265bool ClassLinker::WaitForInitializeClass(const Handle<mirror::Class>& klass, Thread* self, 3266 ObjectLock<mirror::Class>& lock) 3267 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3268 while (true) { 3269 self->AssertNoPendingException(); 3270 CHECK(!klass->IsInitialized()); 3271 lock.WaitIgnoringInterrupts(); 3272 3273 // When we wake up, repeat the test for init-in-progress. If 3274 // there's an exception pending (only possible if 3275 // "interruptShouldThrow" was set), bail out. 3276 if (self->IsExceptionPending()) { 3277 WrapExceptionInInitializer(); 3278 klass->SetStatus(mirror::Class::kStatusError, self); 3279 return false; 3280 } 3281 // Spurious wakeup? Go back to waiting. 3282 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3283 continue; 3284 } 3285 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3286 // Compile time initialization failed. 3287 return false; 3288 } 3289 if (klass->IsErroneous()) { 3290 // The caller wants an exception, but it was thrown in a 3291 // different thread. Synthesize one here. 3292 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3293 PrettyDescriptor(klass.Get()).c_str()); 3294 return false; 3295 } 3296 if (klass->IsInitialized()) { 3297 return true; 3298 } 3299 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 3300 << klass->GetStatus(); 3301 } 3302 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 3303} 3304 3305bool ClassLinker::ValidateSuperClassDescriptors(const Handle<mirror::Class>& klass) { 3306 if (klass->IsInterface()) { 3307 return true; 3308 } 3309 // Begin with the methods local to the superclass. 3310 MethodHelper mh; 3311 MethodHelper super_mh; 3312 if (klass->HasSuperClass() && 3313 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3314 for (int i = klass->GetSuperClass()->GetVTable()->GetLength() - 1; i >= 0; --i) { 3315 mh.ChangeMethod(klass->GetVTable()->GetWithoutChecks(i)); 3316 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTable()->GetWithoutChecks(i)); 3317 bool is_override = mh.GetMethod() != super_mh.GetMethod(); 3318 if (is_override && !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3319 ThrowLinkageError(klass.Get(), "Class %s method %s resolves differently in superclass %s", 3320 PrettyDescriptor(klass.Get()).c_str(), 3321 PrettyMethod(mh.GetMethod()).c_str(), 3322 PrettyDescriptor(klass->GetSuperClass()).c_str()); 3323 return false; 3324 } 3325 } 3326 } 3327 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3328 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 3329 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 3330 for (uint32_t j = 0; j < num_methods; ++j) { 3331 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 3332 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 3333 bool is_override = mh.GetMethod() != super_mh.GetMethod(); 3334 if (is_override && !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3335 ThrowLinkageError(klass.Get(), "Class %s method %s resolves differently in interface %s", 3336 PrettyDescriptor(klass.Get()).c_str(), 3337 PrettyMethod(mh.GetMethod()).c_str(), 3338 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 3339 return false; 3340 } 3341 } 3342 } 3343 } 3344 return true; 3345} 3346 3347bool ClassLinker::EnsureInitialized(const Handle<mirror::Class>& c, bool can_init_fields, 3348 bool can_init_parents) { 3349 DCHECK(c.Get() != NULL); 3350 if (c->IsInitialized()) { 3351 return true; 3352 } 3353 3354 bool success = InitializeClass(c, can_init_fields, can_init_parents); 3355 if (!success) { 3356 if (can_init_fields && can_init_parents) { 3357 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.Get()); 3358 } 3359 } 3360 return success; 3361} 3362 3363void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3364 mirror::Class* c, 3365 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3366 const byte* class_data = dex_file.GetClassData(dex_class_def); 3367 ClassDataItemIterator it(dex_file, class_data); 3368 StackHandleScope<2> hs(Thread::Current()); 3369 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 3370 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 3371 CHECK(!kMovingFields); 3372 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3373 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3374 } 3375} 3376 3377bool ClassLinker::LinkClass(Thread* self, const Handle<mirror::Class>& klass, 3378 const Handle<mirror::ObjectArray<mirror::Class> >& interfaces) { 3379 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3380 if (!LinkSuperClass(klass)) { 3381 return false; 3382 } 3383 if (!LinkMethods(klass, interfaces)) { 3384 return false; 3385 } 3386 if (!LinkInstanceFields(klass)) { 3387 return false; 3388 } 3389 if (!LinkStaticFields(klass)) { 3390 return false; 3391 } 3392 CreateReferenceInstanceOffsets(klass); 3393 CreateReferenceStaticOffsets(klass); 3394 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3395 klass->SetStatus(mirror::Class::kStatusResolved, self); 3396 return true; 3397} 3398 3399bool ClassLinker::LoadSuperAndInterfaces(const Handle<mirror::Class>& klass, 3400 const DexFile& dex_file) { 3401 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3402 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3403 uint16_t super_class_idx = class_def.superclass_idx_; 3404 if (super_class_idx != DexFile::kDexNoIndex16) { 3405 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 3406 if (super_class == NULL) { 3407 DCHECK(Thread::Current()->IsExceptionPending()); 3408 return false; 3409 } 3410 // Verify 3411 if (!klass->CanAccess(super_class)) { 3412 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 3413 PrettyDescriptor(super_class).c_str(), 3414 PrettyDescriptor(klass.Get()).c_str()); 3415 return false; 3416 } 3417 klass->SetSuperClass(super_class); 3418 } 3419 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3420 if (interfaces != NULL) { 3421 for (size_t i = 0; i < interfaces->Size(); i++) { 3422 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3423 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 3424 if (interface == NULL) { 3425 DCHECK(Thread::Current()->IsExceptionPending()); 3426 return false; 3427 } 3428 // Verify 3429 if (!klass->CanAccess(interface)) { 3430 // TODO: the RI seemed to ignore this in my testing. 3431 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 3432 PrettyDescriptor(interface).c_str(), 3433 PrettyDescriptor(klass.Get()).c_str()); 3434 return false; 3435 } 3436 } 3437 } 3438 // Mark the class as loaded. 3439 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3440 return true; 3441} 3442 3443bool ClassLinker::LinkSuperClass(const Handle<mirror::Class>& klass) { 3444 CHECK(!klass->IsPrimitive()); 3445 mirror::Class* super = klass->GetSuperClass(); 3446 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 3447 if (super != NULL) { 3448 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 3449 return false; 3450 } 3451 return true; 3452 } 3453 if (super == NULL) { 3454 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 3455 PrettyDescriptor(klass.Get()).c_str()); 3456 return false; 3457 } 3458 // Verify 3459 if (super->IsFinal() || super->IsInterface()) { 3460 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 3461 PrettyDescriptor(super).c_str(), 3462 PrettyDescriptor(klass.Get()).c_str(), 3463 super->IsFinal() ? "declared final" : "an interface"); 3464 return false; 3465 } 3466 if (!klass->CanAccess(super)) { 3467 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 3468 PrettyDescriptor(super).c_str(), 3469 PrettyDescriptor(klass.Get()).c_str()); 3470 return false; 3471 } 3472 3473 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3474 if (super->IsFinalizable()) { 3475 klass->SetFinalizable(); 3476 } 3477 3478 // Inherit reference flags (if any) from the superclass. 3479 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3480 if (reference_flags != 0) { 3481 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3482 } 3483 // Disallow custom direct subclasses of java.lang.ref.Reference. 3484 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3485 ThrowLinkageError(klass.Get(), 3486 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3487 PrettyDescriptor(klass.Get()).c_str()); 3488 return false; 3489 } 3490 3491 if (kIsDebugBuild) { 3492 // Ensure super classes are fully resolved prior to resolving fields.. 3493 while (super != NULL) { 3494 CHECK(super->IsResolved()); 3495 super = super->GetSuperClass(); 3496 } 3497 } 3498 return true; 3499} 3500 3501// Populate the class vtable and itable. Compute return type indices. 3502bool ClassLinker::LinkMethods(const Handle<mirror::Class>& klass, 3503 const Handle<mirror::ObjectArray<mirror::Class> >& interfaces) { 3504 if (klass->IsInterface()) { 3505 // No vtable. 3506 size_t count = klass->NumVirtualMethods(); 3507 if (!IsUint(16, count)) { 3508 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 3509 return false; 3510 } 3511 for (size_t i = 0; i < count; ++i) { 3512 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3513 } 3514 // Link interface method tables 3515 return LinkInterfaceMethods(klass, interfaces); 3516 } else { 3517 // Link virtual and interface method tables 3518 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3519 } 3520 return true; 3521} 3522 3523bool ClassLinker::LinkVirtualMethods(const Handle<mirror::Class>& klass) { 3524 Thread* self = Thread::Current(); 3525 if (klass->HasSuperClass()) { 3526 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3527 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3528 CHECK_LE(actual_count, max_count); 3529 // TODO: do not assign to the vtable field until it is fully constructed. 3530 StackHandleScope<1> hs(self); 3531 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3532 hs.NewHandle(klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count))); 3533 if (UNLIKELY(vtable.Get() == NULL)) { 3534 CHECK(self->IsExceptionPending()); // OOME. 3535 return false; 3536 } 3537 // See if any of our virtual methods override the superclass. 3538 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3539 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3540 MethodHelper local_mh(local_method); 3541 size_t j = 0; 3542 for (; j < actual_count; ++j) { 3543 mirror::ArtMethod* super_method = vtable->Get(j); 3544 MethodHelper super_mh(super_method); 3545 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3546 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3547 if (super_method->IsFinal()) { 3548 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 3549 PrettyMethod(local_method).c_str(), 3550 super_mh.GetDeclaringClassDescriptor()); 3551 return false; 3552 } 3553 vtable->Set<false>(j, local_method); 3554 local_method->SetMethodIndex(j); 3555 break; 3556 } else { 3557 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3558 << " would have incorrectly overridden the package-private method in " 3559 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3560 } 3561 } 3562 } 3563 if (j == actual_count) { 3564 // Not overriding, append. 3565 vtable->Set<false>(actual_count, local_method); 3566 local_method->SetMethodIndex(actual_count); 3567 actual_count += 1; 3568 } 3569 } 3570 if (!IsUint(16, actual_count)) { 3571 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 3572 return false; 3573 } 3574 // Shrink vtable if possible 3575 CHECK_LE(actual_count, max_count); 3576 if (actual_count < max_count) { 3577 vtable.Assign(vtable->CopyOf(self, actual_count)); 3578 if (UNLIKELY(vtable.Get() == NULL)) { 3579 CHECK(self->IsExceptionPending()); // OOME. 3580 return false; 3581 } 3582 } 3583 klass->SetVTable(vtable.Get()); 3584 } else { 3585 CHECK(klass.Get() == GetClassRoot(kJavaLangObject)); 3586 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3587 if (!IsUint(16, num_virtual_methods)) { 3588 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 3589 return false; 3590 } 3591 StackHandleScope<1> hs(self); 3592 Handle<mirror::ObjectArray<mirror::ArtMethod> > 3593 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 3594 if (UNLIKELY(vtable.Get() == NULL)) { 3595 CHECK(self->IsExceptionPending()); // OOME. 3596 return false; 3597 } 3598 for (size_t i = 0; i < num_virtual_methods; ++i) { 3599 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3600 vtable->Set<false>(i, virtual_method); 3601 virtual_method->SetMethodIndex(i & 0xFFFF); 3602 } 3603 klass->SetVTable(vtable.Get()); 3604 } 3605 return true; 3606} 3607 3608bool ClassLinker::LinkInterfaceMethods(const Handle<mirror::Class>& klass, 3609 const Handle<mirror::ObjectArray<mirror::Class> >& interfaces) { 3610 Thread* const self = Thread::Current(); 3611 // Set the imt table to be all conflicts by default. 3612 klass->SetImTable(Runtime::Current()->GetDefaultImt()); 3613 size_t super_ifcount; 3614 if (klass->HasSuperClass()) { 3615 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3616 } else { 3617 super_ifcount = 0; 3618 } 3619 uint32_t num_interfaces = 3620 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 3621 size_t ifcount = super_ifcount + num_interfaces; 3622 for (size_t i = 0; i < num_interfaces; i++) { 3623 mirror::Class* interface = 3624 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 3625 interfaces->Get(i); 3626 ifcount += interface->GetIfTableCount(); 3627 } 3628 if (ifcount == 0) { 3629 // Class implements no interfaces. 3630 DCHECK_EQ(klass->GetIfTableCount(), 0); 3631 DCHECK(klass->GetIfTable() == NULL); 3632 return true; 3633 } 3634 if (ifcount == super_ifcount) { 3635 // Class implements same interfaces as parent, are any of these not marker interfaces? 3636 bool has_non_marker_interface = false; 3637 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3638 for (size_t i = 0; i < ifcount; ++i) { 3639 if (super_iftable->GetMethodArrayCount(i) > 0) { 3640 has_non_marker_interface = true; 3641 break; 3642 } 3643 } 3644 if (!has_non_marker_interface) { 3645 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3646 klass->SetIfTable(super_iftable); 3647 return true; 3648 } 3649 } 3650 StackHandleScope<2> hs(self); 3651 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 3652 if (UNLIKELY(iftable.Get() == NULL)) { 3653 CHECK(self->IsExceptionPending()); // OOME. 3654 return false; 3655 } 3656 if (super_ifcount != 0) { 3657 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3658 for (size_t i = 0; i < super_ifcount; i++) { 3659 mirror::Class* super_interface = super_iftable->GetInterface(i); 3660 iftable->SetInterface(i, super_interface); 3661 } 3662 } 3663 // Flatten the interface inheritance hierarchy. 3664 size_t idx = super_ifcount; 3665 for (size_t i = 0; i < num_interfaces; i++) { 3666 mirror::Class* interface = 3667 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 3668 interfaces->Get(i); 3669 DCHECK(interface != NULL); 3670 if (!interface->IsInterface()) { 3671 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 3672 PrettyDescriptor(klass.Get()).c_str(), 3673 PrettyDescriptor(interface->GetDescriptor()).c_str()); 3674 return false; 3675 } 3676 // Check if interface is already in iftable 3677 bool duplicate = false; 3678 for (size_t j = 0; j < idx; j++) { 3679 mirror::Class* existing_interface = iftable->GetInterface(j); 3680 if (existing_interface == interface) { 3681 duplicate = true; 3682 break; 3683 } 3684 } 3685 if (!duplicate) { 3686 // Add this non-duplicate interface. 3687 iftable->SetInterface(idx++, interface); 3688 // Add this interface's non-duplicate super-interfaces. 3689 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3690 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3691 bool super_duplicate = false; 3692 for (size_t k = 0; k < idx; k++) { 3693 mirror::Class* existing_interface = iftable->GetInterface(k); 3694 if (existing_interface == super_interface) { 3695 super_duplicate = true; 3696 break; 3697 } 3698 } 3699 if (!super_duplicate) { 3700 iftable->SetInterface(idx++, super_interface); 3701 } 3702 } 3703 } 3704 } 3705 // Shrink iftable in case duplicates were found 3706 if (idx < ifcount) { 3707 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3708 if (UNLIKELY(iftable.Get() == NULL)) { 3709 CHECK(self->IsExceptionPending()); // OOME. 3710 return false; 3711 } 3712 ifcount = idx; 3713 } else { 3714 CHECK_EQ(idx, ifcount); 3715 } 3716 klass->SetIfTable(iftable.Get()); 3717 3718 // If we're an interface, we don't need the vtable pointers, so we're done. 3719 if (klass->IsInterface()) { 3720 return true; 3721 } 3722 // Allocate imtable 3723 bool imtable_changed = false; 3724 Handle<mirror::ObjectArray<mirror::ArtMethod> > imtable( 3725 hs.NewHandle(AllocArtMethodArray(self, kImtSize))); 3726 if (UNLIKELY(imtable.Get() == NULL)) { 3727 CHECK(self->IsExceptionPending()); // OOME. 3728 return false; 3729 } 3730 std::vector<mirror::ArtMethod*> miranda_list; 3731 for (size_t i = 0; i < ifcount; ++i) { 3732 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 3733 if (num_methods > 0) { 3734 StackHandleScope<2> hs(self); 3735 Handle<mirror::ObjectArray<mirror::ArtMethod> > 3736 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 3737 if (UNLIKELY(method_array.Get() == nullptr)) { 3738 CHECK(self->IsExceptionPending()); // OOME. 3739 return false; 3740 } 3741 iftable->SetMethodArray(i, method_array.Get()); 3742 Handle<mirror::ObjectArray<mirror::ArtMethod> > vtable( 3743 hs.NewHandle(klass->GetVTableDuringLinking())); 3744 for (size_t j = 0; j < num_methods; ++j) { 3745 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 3746 MethodHelper interface_mh(interface_method); 3747 int32_t k; 3748 // For each method listed in the interface's method list, find the 3749 // matching method in our class's method list. We want to favor the 3750 // subclass over the superclass, which just requires walking 3751 // back from the end of the vtable. (This only matters if the 3752 // superclass defines a private method and this class redefines 3753 // it -- otherwise it would use the same vtable slot. In .dex files 3754 // those don't end up in the virtual method table, so it shouldn't 3755 // matter which direction we go. We walk it backward anyway.) 3756 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3757 mirror::ArtMethod* vtable_method = vtable->Get(k); 3758 MethodHelper vtable_mh(vtable_method); 3759 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3760 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3761 ThrowIllegalAccessError(klass.Get(), 3762 "Method '%s' implementing interface method '%s' is not public", 3763 PrettyMethod(vtable_method).c_str(), 3764 PrettyMethod(interface_method).c_str()); 3765 return false; 3766 } 3767 method_array->Set<false>(j, vtable_method); 3768 // Place method in imt if entry is empty, place conflict otherwise. 3769 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3770 if (imtable->Get(imt_index) == NULL) { 3771 imtable->Set<false>(imt_index, vtable_method); 3772 imtable_changed = true; 3773 } else { 3774 imtable->Set<false>(imt_index, Runtime::Current()->GetImtConflictMethod()); 3775 } 3776 break; 3777 } 3778 } 3779 if (k < 0) { 3780 StackHandleScope<1> hs(self); 3781 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 3782 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3783 mirror::ArtMethod* mir_method = miranda_list[mir]; 3784 MethodHelper vtable_mh(mir_method); 3785 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3786 miranda_method.Assign(miranda_list[mir]); 3787 break; 3788 } 3789 } 3790 if (miranda_method.Get() == NULL) { 3791 // Point the interface table at a phantom slot. 3792 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3793 if (UNLIKELY(miranda_method.Get() == NULL)) { 3794 CHECK(self->IsExceptionPending()); // OOME. 3795 return false; 3796 } 3797 // TODO: If a methods move then the miranda_list may hold stale references. 3798 miranda_list.push_back(miranda_method.Get()); 3799 } 3800 method_array->Set<false>(j, miranda_method.Get()); 3801 } 3802 } 3803 } 3804 } 3805 if (imtable_changed) { 3806 // Fill in empty entries in interface method table with conflict. 3807 mirror::ArtMethod* imt_conflict_method = Runtime::Current()->GetImtConflictMethod(); 3808 for (size_t i = 0; i < kImtSize; i++) { 3809 if (imtable->Get(i) == NULL) { 3810 imtable->Set<false>(i, imt_conflict_method); 3811 } 3812 } 3813 klass->SetImTable(imtable.Get()); 3814 } 3815 if (!miranda_list.empty()) { 3816 int old_method_count = klass->NumVirtualMethods(); 3817 int new_method_count = old_method_count + miranda_list.size(); 3818 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3819 if (old_method_count == 0) { 3820 virtuals = AllocArtMethodArray(self, new_method_count); 3821 } else { 3822 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3823 } 3824 if (UNLIKELY(virtuals == NULL)) { 3825 CHECK(self->IsExceptionPending()); // OOME. 3826 return false; 3827 } 3828 klass->SetVirtualMethods(virtuals); 3829 3830 StackHandleScope<1> hs(self); 3831 Handle<mirror::ObjectArray<mirror::ArtMethod> > vtable( 3832 hs.NewHandle(klass->GetVTableDuringLinking())); 3833 CHECK(vtable.Get() != NULL); 3834 int old_vtable_count = vtable->GetLength(); 3835 int new_vtable_count = old_vtable_count + miranda_list.size(); 3836 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 3837 if (UNLIKELY(vtable.Get() == NULL)) { 3838 CHECK(self->IsExceptionPending()); // OOME. 3839 return false; 3840 } 3841 for (size_t i = 0; i < miranda_list.size(); ++i) { 3842 mirror::ArtMethod* method = miranda_list[i]; 3843 // Leave the declaring class alone as type indices are relative to it 3844 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3845 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3846 klass->SetVirtualMethod(old_method_count + i, method); 3847 vtable->Set<false>(old_vtable_count + i, method); 3848 } 3849 // TODO: do not assign to the vtable field until it is fully constructed. 3850 klass->SetVTable(vtable.Get()); 3851 } 3852 3853 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3854 for (int i = 0; i < vtable->GetLength(); ++i) { 3855 CHECK(vtable->Get(i) != NULL); 3856 } 3857 3858// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3859 3860 return true; 3861} 3862 3863bool ClassLinker::LinkInstanceFields(const Handle<mirror::Class>& klass) { 3864 CHECK(klass.Get() != NULL); 3865 return LinkFields(klass, false); 3866} 3867 3868bool ClassLinker::LinkStaticFields(const Handle<mirror::Class>& klass) { 3869 CHECK(klass.Get() != NULL); 3870 size_t allocated_class_size = klass->GetClassSize(); 3871 bool success = LinkFields(klass, true); 3872 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3873 return success; 3874} 3875 3876struct LinkFieldsComparator { 3877 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3878 } 3879 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3880 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 3881 NO_THREAD_SAFETY_ANALYSIS { 3882 // First come reference fields, then 64-bit, and finally 32-bit 3883 FieldHelper fh1(field1); 3884 Primitive::Type type1 = fh1.GetTypeAsPrimitiveType(); 3885 FieldHelper fh2(field2); 3886 Primitive::Type type2 = fh2.GetTypeAsPrimitiveType(); 3887 if (type1 != type2) { 3888 bool is_primitive1 = type1 != Primitive::kPrimNot; 3889 bool is_primitive2 = type2 != Primitive::kPrimNot; 3890 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3891 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3892 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 3893 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 3894 if (order1 != order2) { 3895 return order1 < order2; 3896 } 3897 } 3898 // same basic group? then sort by string. 3899 const char* name1 = fh1.GetName(); 3900 const char* name2 = fh2.GetName(); 3901 return strcmp(name1, name2) < 0; 3902 } 3903}; 3904 3905bool ClassLinker::LinkFields(const Handle<mirror::Class>& klass, bool is_static) { 3906 size_t num_fields = 3907 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3908 3909 mirror::ObjectArray<mirror::ArtField>* fields = 3910 is_static ? klass->GetSFields() : klass->GetIFields(); 3911 3912 // Initialize size and field_offset 3913 size_t size; 3914 MemberOffset field_offset(0); 3915 if (is_static) { 3916 size = klass->GetClassSize(); 3917 field_offset = mirror::Class::FieldsOffset(); 3918 } else { 3919 mirror::Class* super_class = klass->GetSuperClass(); 3920 if (super_class != NULL) { 3921 CHECK(super_class->IsResolved()); 3922 field_offset = MemberOffset(super_class->GetObjectSize()); 3923 } 3924 size = field_offset.Uint32Value(); 3925 } 3926 3927 CHECK_EQ(num_fields == 0, fields == NULL); 3928 3929 // we want a relatively stable order so that adding new fields 3930 // minimizes disruption of C++ version such as Class and Method. 3931 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3932 for (size_t i = 0; i < num_fields; i++) { 3933 mirror::ArtField* f = fields->Get(i); 3934 CHECK(f != NULL); 3935 grouped_and_sorted_fields.push_back(f); 3936 } 3937 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 3938 LinkFieldsComparator()); 3939 3940 // References should be at the front. 3941 size_t current_field = 0; 3942 size_t num_reference_fields = 0; 3943 for (; current_field < num_fields; current_field++) { 3944 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3945 FieldHelper fh(field); 3946 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3947 bool isPrimitive = type != Primitive::kPrimNot; 3948 if (isPrimitive) { 3949 break; // past last reference, move on to the next phase 3950 } 3951 grouped_and_sorted_fields.pop_front(); 3952 num_reference_fields++; 3953 fields->Set<false>(current_field, field); 3954 field->SetOffset(field_offset); 3955 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3956 } 3957 3958 // Now we want to pack all of the double-wide fields together. If 3959 // we're not aligned, though, we want to shuffle one 32-bit field 3960 // into place. If we can't find one, we'll have to pad it. 3961 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3962 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3963 mirror::ArtField* field = grouped_and_sorted_fields[i]; 3964 FieldHelper fh(field); 3965 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3966 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3967 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 3968 continue; 3969 } 3970 fields->Set<false>(current_field++, field); 3971 field->SetOffset(field_offset); 3972 // drop the consumed field 3973 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 3974 break; 3975 } 3976 // whether we found a 32-bit field for padding or not, we advance 3977 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3978 } 3979 3980 // Alignment is good, shuffle any double-wide fields forward, and 3981 // finish assigning field offsets to all fields. 3982 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 3983 while (!grouped_and_sorted_fields.empty()) { 3984 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3985 grouped_and_sorted_fields.pop_front(); 3986 FieldHelper fh(field); 3987 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3988 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3989 fields->Set<false>(current_field, field); 3990 field->SetOffset(field_offset); 3991 field_offset = MemberOffset(field_offset.Uint32Value() + 3992 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 3993 ? sizeof(uint64_t) 3994 : sizeof(uint32_t))); 3995 current_field++; 3996 } 3997 3998 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 3999 if (!is_static && "Ljava/lang/ref/Reference;" == klass->GetDescriptor()) { 4000 // We know there are no non-reference fields in the Reference classes, and we know 4001 // that 'referent' is alphabetically last, so this is easy... 4002 CHECK_EQ(num_reference_fields, num_fields); 4003 FieldHelper fh(fields->Get(num_fields - 1)); 4004 CHECK_STREQ(fh.GetName(), "referent"); 4005 --num_reference_fields; 4006 } 4007 4008 if (kIsDebugBuild) { 4009 // Make sure that all reference fields appear before 4010 // non-reference fields, and all double-wide fields are aligned. 4011 bool seen_non_ref = false; 4012 for (size_t i = 0; i < num_fields; i++) { 4013 mirror::ArtField* field = fields->Get(i); 4014 if (false) { // enable to debug field layout 4015 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4016 << " class=" << PrettyClass(klass.Get()) 4017 << " field=" << PrettyField(field) 4018 << " offset=" 4019 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4020 } 4021 FieldHelper fh(field); 4022 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4023 bool is_primitive = type != Primitive::kPrimNot; 4024 if ("Ljava/lang/ref/Reference;" == klass->GetDescriptor() && 4025 strcmp("referent", fh.GetName()) == 0) { 4026 is_primitive = true; // We lied above, so we have to expect a lie here. 4027 } 4028 if (is_primitive) { 4029 if (!seen_non_ref) { 4030 seen_non_ref = true; 4031 DCHECK_EQ(num_reference_fields, i); 4032 } 4033 } else { 4034 DCHECK(!seen_non_ref); 4035 } 4036 } 4037 if (!seen_non_ref) { 4038 DCHECK_EQ(num_fields, num_reference_fields); 4039 } 4040 } 4041 size = field_offset.Uint32Value(); 4042 // Update klass 4043 if (is_static) { 4044 klass->SetNumReferenceStaticFields(num_reference_fields); 4045 klass->SetClassSize(size); 4046 } else { 4047 klass->SetNumReferenceInstanceFields(num_reference_fields); 4048 if (!klass->IsVariableSize()) { 4049 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(); 4050 size_t previous_size = klass->GetObjectSize(); 4051 if (previous_size != 0) { 4052 // Make sure that we didn't originally have an incorrect size. 4053 CHECK_EQ(previous_size, size); 4054 } 4055 klass->SetObjectSize(size); 4056 } 4057 } 4058 return true; 4059} 4060 4061// Set the bitmap of reference offsets, refOffsets, from the ifields 4062// list. 4063void ClassLinker::CreateReferenceInstanceOffsets(const Handle<mirror::Class>& klass) { 4064 uint32_t reference_offsets = 0; 4065 mirror::Class* super_class = klass->GetSuperClass(); 4066 if (super_class != NULL) { 4067 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4068 // If our superclass overflowed, we don't stand a chance. 4069 if (reference_offsets == CLASS_WALK_SUPER) { 4070 klass->SetReferenceInstanceOffsets(reference_offsets); 4071 return; 4072 } 4073 } 4074 CreateReferenceOffsets(klass, false, reference_offsets); 4075} 4076 4077void ClassLinker::CreateReferenceStaticOffsets(const Handle<mirror::Class>& klass) { 4078 CreateReferenceOffsets(klass, true, 0); 4079} 4080 4081void ClassLinker::CreateReferenceOffsets(const Handle<mirror::Class>& klass, bool is_static, 4082 uint32_t reference_offsets) { 4083 size_t num_reference_fields = 4084 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4085 : klass->NumReferenceInstanceFieldsDuringLinking(); 4086 mirror::ObjectArray<mirror::ArtField>* fields = 4087 is_static ? klass->GetSFields() : klass->GetIFields(); 4088 // All of the fields that contain object references are guaranteed 4089 // to be at the beginning of the fields list. 4090 for (size_t i = 0; i < num_reference_fields; ++i) { 4091 // Note that byte_offset is the offset from the beginning of 4092 // object, not the offset into instance data 4093 mirror::ArtField* field = fields->Get(i); 4094 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4095 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4096 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4097 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4098 CHECK_NE(new_bit, 0U); 4099 reference_offsets |= new_bit; 4100 } else { 4101 reference_offsets = CLASS_WALK_SUPER; 4102 break; 4103 } 4104 } 4105 // Update fields in klass 4106 if (is_static) { 4107 klass->SetReferenceStaticOffsets(reference_offsets); 4108 } else { 4109 klass->SetReferenceInstanceOffsets(reference_offsets); 4110 } 4111} 4112 4113mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4114 const Handle<mirror::DexCache>& dex_cache) { 4115 DCHECK(dex_cache.Get() != nullptr); 4116 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4117 if (resolved != NULL) { 4118 return resolved; 4119 } 4120 uint32_t utf16_length; 4121 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4122 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4123 dex_cache->SetResolvedString(string_idx, string); 4124 return string; 4125} 4126 4127mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4128 mirror::Class* referrer) { 4129 StackHandleScope<2> hs(Thread::Current()); 4130 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4131 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4132 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4133} 4134 4135mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4136 const Handle<mirror::DexCache>& dex_cache, 4137 const Handle<mirror::ClassLoader>& class_loader) { 4138 DCHECK(dex_cache.Get() != NULL); 4139 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4140 if (resolved == NULL) { 4141 Thread* self = Thread::Current(); 4142 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4143 resolved = FindClass(self, descriptor, class_loader); 4144 if (resolved != NULL) { 4145 // TODO: we used to throw here if resolved's class loader was not the 4146 // boot class loader. This was to permit different classes with the 4147 // same name to be loaded simultaneously by different loaders 4148 dex_cache->SetResolvedType(type_idx, resolved); 4149 } else { 4150 CHECK(self->IsExceptionPending()) 4151 << "Expected pending exception for failed resolution of: " << descriptor; 4152 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4153 StackHandleScope<1> hs(self); 4154 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4155 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4156 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4157 self->ClearException(); 4158 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4159 self->GetException(NULL)->SetCause(cause.Get()); 4160 } 4161 } 4162 } 4163 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4164 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4165 return resolved; 4166} 4167 4168mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 4169 uint32_t method_idx, 4170 const Handle<mirror::DexCache>& dex_cache, 4171 const Handle<mirror::ClassLoader>& class_loader, 4172 mirror::ArtMethod* referrer, 4173 InvokeType type) { 4174 DCHECK(dex_cache.Get() != NULL); 4175 // Check for hit in the dex cache. 4176 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4177 if (resolved != NULL && !resolved->IsRuntimeMethod()) { 4178 return resolved; 4179 } 4180 // Fail, get the declaring class. 4181 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4182 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4183 if (klass == NULL) { 4184 DCHECK(Thread::Current()->IsExceptionPending()); 4185 return NULL; 4186 } 4187 // Scan using method_idx, this saves string compares but will only hit for matching dex 4188 // caches/files. 4189 switch (type) { 4190 case kDirect: // Fall-through. 4191 case kStatic: 4192 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 4193 break; 4194 case kInterface: 4195 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 4196 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4197 break; 4198 case kSuper: // Fall-through. 4199 case kVirtual: 4200 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 4201 break; 4202 default: 4203 LOG(FATAL) << "Unreachable - invocation type: " << type; 4204 } 4205 if (resolved == NULL) { 4206 // Search by name, which works across dex files. 4207 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4208 const Signature signature = dex_file.GetMethodSignature(method_id); 4209 switch (type) { 4210 case kDirect: // Fall-through. 4211 case kStatic: 4212 resolved = klass->FindDirectMethod(name, signature); 4213 break; 4214 case kInterface: 4215 resolved = klass->FindInterfaceMethod(name, signature); 4216 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4217 break; 4218 case kSuper: // Fall-through. 4219 case kVirtual: 4220 resolved = klass->FindVirtualMethod(name, signature); 4221 break; 4222 } 4223 } 4224 if (resolved != NULL) { 4225 // We found a method, check for incompatible class changes. 4226 if (resolved->CheckIncompatibleClassChange(type)) { 4227 resolved = NULL; 4228 } 4229 } 4230 if (resolved != NULL) { 4231 // Be a good citizen and update the dex cache to speed subsequent calls. 4232 dex_cache->SetResolvedMethod(method_idx, resolved); 4233 return resolved; 4234 } else { 4235 // We failed to find the method which means either an access error, an incompatible class 4236 // change, or no such method. First try to find the method among direct and virtual methods. 4237 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4238 const Signature signature = dex_file.GetMethodSignature(method_id); 4239 switch (type) { 4240 case kDirect: 4241 case kStatic: 4242 resolved = klass->FindVirtualMethod(name, signature); 4243 break; 4244 case kInterface: 4245 case kVirtual: 4246 case kSuper: 4247 resolved = klass->FindDirectMethod(name, signature); 4248 break; 4249 } 4250 4251 // If we found something, check that it can be accessed by the referrer. 4252 if (resolved != NULL && referrer != NULL) { 4253 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4254 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4255 if (!referring_class->CanAccess(methods_class)) { 4256 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4257 resolved, type); 4258 return NULL; 4259 } else if (!referring_class->CanAccessMember(methods_class, 4260 resolved->GetAccessFlags())) { 4261 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4262 return NULL; 4263 } 4264 } 4265 4266 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4267 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4268 switch (type) { 4269 case kDirect: 4270 case kStatic: 4271 if (resolved != NULL) { 4272 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4273 } else { 4274 resolved = klass->FindInterfaceMethod(name, signature); 4275 if (resolved != NULL) { 4276 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4277 } else { 4278 ThrowNoSuchMethodError(type, klass, name, signature); 4279 } 4280 } 4281 break; 4282 case kInterface: 4283 if (resolved != NULL) { 4284 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4285 } else { 4286 resolved = klass->FindVirtualMethod(name, signature); 4287 if (resolved != NULL) { 4288 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4289 } else { 4290 ThrowNoSuchMethodError(type, klass, name, signature); 4291 } 4292 } 4293 break; 4294 case kSuper: 4295 ThrowNoSuchMethodError(type, klass, name, signature); 4296 break; 4297 case kVirtual: 4298 if (resolved != NULL) { 4299 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4300 } else { 4301 resolved = klass->FindInterfaceMethod(name, signature); 4302 if (resolved != NULL) { 4303 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4304 } else { 4305 ThrowNoSuchMethodError(type, klass, name, signature); 4306 } 4307 } 4308 break; 4309 } 4310 DCHECK(Thread::Current()->IsExceptionPending()); 4311 return NULL; 4312 } 4313} 4314 4315mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4316 const Handle<mirror::DexCache>& dex_cache, 4317 const Handle<mirror::ClassLoader>& class_loader, 4318 bool is_static) { 4319 DCHECK(dex_cache.Get() != nullptr); 4320 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4321 if (resolved != NULL) { 4322 return resolved; 4323 } 4324 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4325 Thread* const self = Thread::Current(); 4326 StackHandleScope<1> hs(self); 4327 Handle<mirror::Class> klass( 4328 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4329 if (klass.Get() == NULL) { 4330 DCHECK(Thread::Current()->IsExceptionPending()); 4331 return NULL; 4332 } 4333 4334 if (is_static) { 4335 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 4336 } else { 4337 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 4338 } 4339 4340 if (resolved == NULL) { 4341 const char* name = dex_file.GetFieldName(field_id); 4342 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4343 if (is_static) { 4344 resolved = mirror::Class::FindStaticField(self, klass, name, type); 4345 } else { 4346 resolved = klass->FindInstanceField(name, type); 4347 } 4348 if (resolved == NULL) { 4349 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 4350 return NULL; 4351 } 4352 } 4353 dex_cache->SetResolvedField(field_idx, resolved); 4354 return resolved; 4355} 4356 4357mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4358 uint32_t field_idx, 4359 const Handle<mirror::DexCache>& dex_cache, 4360 const Handle<mirror::ClassLoader>& class_loader) { 4361 DCHECK(dex_cache.Get() != nullptr); 4362 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4363 if (resolved != NULL) { 4364 return resolved; 4365 } 4366 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4367 Thread* self = Thread::Current(); 4368 StackHandleScope<1> hs(self); 4369 Handle<mirror::Class> klass( 4370 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4371 if (klass.Get() == NULL) { 4372 DCHECK(Thread::Current()->IsExceptionPending()); 4373 return NULL; 4374 } 4375 4376 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4377 StringPiece type(dex_file.StringDataByIdx( 4378 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4379 resolved = mirror::Class::FindField(self, klass, name, type); 4380 if (resolved != NULL) { 4381 dex_cache->SetResolvedField(field_idx, resolved); 4382 } else { 4383 ThrowNoSuchFieldError("", klass.Get(), type, name); 4384 } 4385 return resolved; 4386} 4387 4388const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4389 uint32_t* length) { 4390 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4391 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4392 const DexFile& dex_file = *dex_cache->GetDexFile(); 4393 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4394 return dex_file.GetMethodShorty(method_id, length); 4395} 4396 4397void ClassLinker::DumpAllClasses(int flags) { 4398 if (dex_cache_image_class_lookup_required_) { 4399 MoveImageClassesToClassTable(); 4400 } 4401 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4402 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4403 std::vector<mirror::Class*> all_classes; 4404 { 4405 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4406 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 4407 all_classes.push_back(it.second); 4408 } 4409 } 4410 4411 for (size_t i = 0; i < all_classes.size(); ++i) { 4412 all_classes[i]->DumpClass(std::cerr, flags); 4413 } 4414} 4415 4416void ClassLinker::DumpForSigQuit(std::ostream& os) { 4417 if (dex_cache_image_class_lookup_required_) { 4418 MoveImageClassesToClassTable(); 4419 } 4420 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4421 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4422} 4423 4424size_t ClassLinker::NumLoadedClasses() { 4425 if (dex_cache_image_class_lookup_required_) { 4426 MoveImageClassesToClassTable(); 4427 } 4428 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4429 return class_table_.size(); 4430} 4431 4432pid_t ClassLinker::GetClassesLockOwner() { 4433 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4434} 4435 4436pid_t ClassLinker::GetDexLockOwner() { 4437 return dex_lock_.GetExclusiveOwnerTid(); 4438} 4439 4440void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4441 DCHECK(!init_done_); 4442 4443 DCHECK(klass != NULL); 4444 DCHECK(klass->GetClassLoader() == NULL); 4445 4446 DCHECK(class_roots_ != NULL); 4447 DCHECK(class_roots_->Get(class_root) == NULL); 4448 class_roots_->Set<false>(class_root, klass); 4449} 4450 4451} // namespace art 4452