class_linker.cc revision 52e4b43d62896b56f8c2bd041e528472bb4a0d8d
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <fcntl.h> 20#include <sys/file.h> 21#include <sys/stat.h> 22#include <deque> 23#include <memory> 24#include <string> 25#include <utility> 26#include <vector> 27 28#include "base/casts.h" 29#include "base/logging.h" 30#include "base/scoped_flock.h" 31#include "base/stl_util.h" 32#include "base/unix_file/fd_file.h" 33#include "class_linker-inl.h" 34#include "compiler_callbacks.h" 35#include "debugger.h" 36#include "dex_file-inl.h" 37#include "gc/accounting/card_table-inl.h" 38#include "gc/accounting/heap_bitmap.h" 39#include "gc/heap.h" 40#include "gc/space/image_space.h" 41#include "handle_scope.h" 42#include "intern_table.h" 43#include "interpreter/interpreter.h" 44#include "leb128.h" 45#include "oat.h" 46#include "oat_file.h" 47#include "mirror/art_field-inl.h" 48#include "mirror/art_method-inl.h" 49#include "mirror/class.h" 50#include "mirror/class-inl.h" 51#include "mirror/class_loader.h" 52#include "mirror/dex_cache-inl.h" 53#include "mirror/iftable-inl.h" 54#include "mirror/object-inl.h" 55#include "mirror/object_array-inl.h" 56#include "mirror/proxy.h" 57#include "mirror/stack_trace_element.h" 58#include "object_utils.h" 59#include "os.h" 60#include "runtime.h" 61#include "entrypoints/entrypoint_utils.h" 62#include "ScopedLocalRef.h" 63#include "scoped_thread_state_change.h" 64#include "handle_scope-inl.h" 65#include "thread.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), 211 VoidFunctor())))); 212 CHECK(java_lang_Class.Get() != NULL); 213 mirror::Class::SetClassClass(java_lang_Class.Get()); 214 java_lang_Class->SetClass(java_lang_Class.Get()); 215 if (kUseBakerOrBrooksReadBarrier) { 216 java_lang_Class->AssertReadBarrierPointer(); 217 } 218 java_lang_Class->SetClassSize(sizeof(mirror::ClassClass)); 219 heap->DecrementDisableMovingGC(self); 220 // AllocClass(mirror::Class*) can now be used 221 222 // Class[] is used for reflection support. 223 Handle<mirror::Class> class_array_class( 224 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 225 class_array_class->SetComponentType(java_lang_Class.Get()); 226 227 // java_lang_Object comes next so that object_array_class can be created. 228 Handle<mirror::Class> java_lang_Object( 229 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 230 CHECK(java_lang_Object.Get() != NULL); 231 // backfill Object as the super class of Class. 232 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 233 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 234 235 // Object[] next to hold class roots. 236 Handle<mirror::Class> object_array_class( 237 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 238 object_array_class->SetComponentType(java_lang_Object.Get()); 239 240 // Setup the char class to be used for char[]. 241 Handle<mirror::Class> char_class(hs.NewHandle(AllocClass(self, java_lang_Class.Get(), 242 sizeof(mirror::Class)))); 243 244 // Setup the char[] class to be used for String. 245 Handle<mirror::Class> char_array_class(hs.NewHandle(AllocClass(self, java_lang_Class.Get(), 246 sizeof(mirror::Class)))); 247 char_array_class->SetComponentType(char_class.Get()); 248 mirror::CharArray::SetArrayClass(char_array_class.Get()); 249 250 // Setup String. 251 Handle<mirror::Class> java_lang_String(hs.NewHandle(AllocClass(self, java_lang_Class.Get(), 252 sizeof(mirror::StringClass)))); 253 mirror::String::SetClass(java_lang_String.Get()); 254 java_lang_String->SetObjectSize(sizeof(mirror::String)); 255 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 256 257 // Create storage for root classes, save away our work so far (requires descriptors). 258 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 259 kClassRootsMax); 260 CHECK(class_roots_ != NULL); 261 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 262 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 263 SetClassRoot(kClassArrayClass, class_array_class.Get()); 264 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 265 SetClassRoot(kCharArrayClass, char_array_class.Get()); 266 SetClassRoot(kJavaLangString, java_lang_String.Get()); 267 268 // Setup the primitive type classes. 269 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 270 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 271 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 272 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 273 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 274 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 275 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 276 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 277 278 // Create array interface entries to populate once we can load system classes. 279 array_iftable_ = AllocIfTable(self, 2); 280 281 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 282 Handle<mirror::Class> int_array_class( 283 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 284 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 285 mirror::IntArray::SetArrayClass(int_array_class.Get()); 286 SetClassRoot(kIntArrayClass, int_array_class.Get()); 287 288 // now that these are registered, we can use AllocClass() and AllocObjectArray 289 290 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 291 Handle<mirror::Class> java_lang_DexCache( 292 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::DexCacheClass)))); 293 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 294 java_lang_DexCache->SetObjectSize(sizeof(mirror::DexCache)); 295 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 296 297 // Constructor, Field, Method, and AbstractMethod are necessary so 298 // that FindClass can link members. 299 Handle<mirror::Class> java_lang_reflect_ArtField( 300 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::ArtFieldClass)))); 301 CHECK(java_lang_reflect_ArtField.Get() != NULL); 302 java_lang_reflect_ArtField->SetObjectSize(sizeof(mirror::ArtField)); 303 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 304 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 305 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 306 307 Handle<mirror::Class> java_lang_reflect_ArtMethod( 308 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::ArtMethodClass)))); 309 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 310 java_lang_reflect_ArtMethod->SetObjectSize(sizeof(mirror::ArtMethod)); 311 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 312 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 313 314 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 315 316 // Set up array classes for string, field, method 317 Handle<mirror::Class> object_array_string( 318 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 319 object_array_string->SetComponentType(java_lang_String.Get()); 320 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 321 322 Handle<mirror::Class> object_array_art_method( 323 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 324 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 325 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 326 327 Handle<mirror::Class> object_array_art_field( 328 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 329 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 330 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 331 332 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 333 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 334 // these roots. 335 CHECK_NE(0U, boot_class_path.size()); 336 for (size_t i = 0; i != boot_class_path.size(); ++i) { 337 const DexFile* dex_file = boot_class_path[i]; 338 CHECK(dex_file != NULL); 339 AppendToBootClassPath(*dex_file); 340 } 341 342 // now we can use FindSystemClass 343 344 // run char class through InitializePrimitiveClass to finish init 345 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 346 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 347 348 // Create runtime resolution and imt conflict methods. Also setup the default imt. 349 Runtime* runtime = Runtime::Current(); 350 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 351 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 352 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 353 354 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 355 // we do not need friend classes or a publicly exposed setter. 356 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 357 358 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 359 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 360 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 361 CHECK_EQ(java_lang_Object.Get(), Object_class); 362 CHECK_EQ(java_lang_Object->GetObjectSize(), sizeof(mirror::Object)); 363 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 364 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 365 CHECK_EQ(java_lang_String.Get(), String_class); 366 CHECK_EQ(java_lang_String->GetObjectSize(), sizeof(mirror::String)); 367 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 368 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 369 CHECK_EQ(java_lang_String.Get(), String_class); 370 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 371 CHECK_EQ(java_lang_DexCache->GetObjectSize(), sizeof(mirror::DexCache)); 372 373 // Setup the primitive array type classes - can't be done until Object has a vtable. 374 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 375 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 376 377 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 378 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 379 380 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 381 CHECK_EQ(char_array_class.Get(), found_char_array_class); 382 383 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 384 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 385 386 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 387 CHECK_EQ(int_array_class.Get(), found_int_array_class); 388 389 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 390 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 391 392 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 393 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 394 395 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 396 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 397 398 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 399 CHECK_EQ(class_array_class.Get(), found_class_array_class); 400 401 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 402 CHECK_EQ(object_array_class.Get(), found_object_array_class); 403 404 // Setup the single, global copy of "iftable". 405 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 406 CHECK(java_lang_Cloneable != NULL); 407 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 408 CHECK(java_io_Serializable != NULL); 409 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 410 // crawl up and explicitly list all of the supers as well. 411 array_iftable_->SetInterface(0, java_lang_Cloneable); 412 array_iftable_->SetInterface(1, java_io_Serializable); 413 414 // Sanity check Class[] and Object[]'s interfaces. 415 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 416 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 417 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 418 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 419 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 420 // dex_cache_ fields and register them in class_table_. 421 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 422 CHECK_EQ(java_lang_Class.Get(), Class_class); 423 424 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 425 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 426 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 427 428 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 429 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 430 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 431 432 mirror::Class* String_array_class = 433 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 434 CHECK_EQ(object_array_string.Get(), String_array_class); 435 436 mirror::Class* Art_method_array_class = 437 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 438 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 439 440 mirror::Class* Art_field_array_class = 441 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 442 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 443 444 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 445 446 // Create java.lang.reflect.Proxy root. 447 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 448 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 449 450 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 451 mirror::Class* java_lang_ref_Reference = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 452 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference); 453 mirror::Class* java_lang_ref_FinalizerReference = 454 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 455 java_lang_ref_FinalizerReference->SetAccessFlags( 456 java_lang_ref_FinalizerReference->GetAccessFlags() | 457 kAccClassIsReference | kAccClassIsFinalizerReference); 458 mirror::Class* java_lang_ref_PhantomReference = 459 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 460 java_lang_ref_PhantomReference->SetAccessFlags( 461 java_lang_ref_PhantomReference->GetAccessFlags() | 462 kAccClassIsReference | kAccClassIsPhantomReference); 463 mirror::Class* java_lang_ref_SoftReference = 464 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 465 java_lang_ref_SoftReference->SetAccessFlags( 466 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 467 mirror::Class* java_lang_ref_WeakReference = 468 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 469 java_lang_ref_WeakReference->SetAccessFlags( 470 java_lang_ref_WeakReference->GetAccessFlags() | 471 kAccClassIsReference | kAccClassIsWeakReference); 472 473 // Setup the ClassLoader, verifying the object_size_. 474 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 475 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), sizeof(mirror::ClassLoader)); 476 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 477 478 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 479 // java.lang.StackTraceElement as a convenience. 480 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 481 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 482 SetClassRoot(kJavaLangClassNotFoundException, 483 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 484 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 485 SetClassRoot(kJavaLangStackTraceElementArrayClass, 486 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 487 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 488 489 FinishInit(self); 490 491 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 492} 493 494void ClassLinker::FinishInit(Thread* self) { 495 VLOG(startup) << "ClassLinker::FinishInit entering"; 496 497 // Let the heap know some key offsets into java.lang.ref instances 498 // Note: we hard code the field indexes here rather than using FindInstanceField 499 // as the types of the field can't be resolved prior to the runtime being 500 // fully initialized 501 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 502 mirror::Class* java_lang_ref_FinalizerReference = 503 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 504 505 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 506 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 507 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 508 509 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 510 CHECK_STREQ(queue->GetName(), "queue"); 511 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 512 513 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 514 CHECK_STREQ(queueNext->GetName(), "queueNext"); 515 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 516 517 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 518 CHECK_STREQ(referent->GetName(), "referent"); 519 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 520 521 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 522 CHECK_STREQ(zombie->GetName(), "zombie"); 523 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 524 525 // ensure all class_roots_ are initialized 526 for (size_t i = 0; i < kClassRootsMax; i++) { 527 ClassRoot class_root = static_cast<ClassRoot>(i); 528 mirror::Class* klass = GetClassRoot(class_root); 529 CHECK(klass != NULL); 530 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 531 // note SetClassRoot does additional validation. 532 // if possible add new checks there to catch errors early 533 } 534 535 CHECK(array_iftable_ != NULL); 536 537 // disable the slow paths in FindClass and CreatePrimitiveClass now 538 // that Object, Class, and Object[] are setup 539 init_done_ = true; 540 541 VLOG(startup) << "ClassLinker::FinishInit exiting"; 542} 543 544void ClassLinker::RunRootClinits() { 545 Thread* self = Thread::Current(); 546 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 547 mirror::Class* c = GetClassRoot(ClassRoot(i)); 548 if (!c->IsArrayClass() && !c->IsPrimitive()) { 549 StackHandleScope<1> hs(self); 550 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 551 EnsureInitialized(h_class, true, true); 552 self->AssertNoPendingException(); 553 } 554 } 555} 556 557bool ClassLinker::GenerateOatFile(const char* dex_filename, 558 int oat_fd, 559 const char* oat_cache_filename, 560 std::string* error_msg) { 561 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 562 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 563 564 gc::Heap* heap = Runtime::Current()->GetHeap(); 565 std::string boot_image_option("--boot-image="); 566 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 567 568 std::string dex_file_option("--dex-file="); 569 dex_file_option += dex_filename; 570 571 std::string oat_fd_option("--oat-fd="); 572 StringAppendF(&oat_fd_option, "%d", oat_fd); 573 574 std::string oat_location_option("--oat-location="); 575 oat_location_option += oat_cache_filename; 576 577 std::vector<std::string> argv; 578 argv.push_back(dex2oat); 579 argv.push_back("--runtime-arg"); 580 argv.push_back("-Xms64m"); 581 argv.push_back("--runtime-arg"); 582 argv.push_back("-Xmx64m"); 583 argv.push_back("--runtime-arg"); 584 argv.push_back("-classpath"); 585 argv.push_back("--runtime-arg"); 586 argv.push_back(Runtime::Current()->GetClassPathString()); 587 588 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 589 590 if (!Runtime::Current()->IsVerificationEnabled()) { 591 argv.push_back("--compiler-filter=verify-none"); 592 } 593 594 if (!kIsTargetBuild) { 595 argv.push_back("--host"); 596 } 597 598 argv.push_back(boot_image_option); 599 argv.push_back(dex_file_option); 600 argv.push_back(oat_fd_option); 601 argv.push_back(oat_location_option); 602 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 603 for (size_t i = 0; i < compiler_options.size(); ++i) { 604 argv.push_back(compiler_options[i].c_str()); 605 } 606 607 return Exec(argv, error_msg); 608} 609 610const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 611 WriterMutexLock mu(Thread::Current(), dex_lock_); 612 if (kIsDebugBuild) { 613 for (size_t i = 0; i < oat_files_.size(); ++i) { 614 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 615 } 616 } 617 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 618 oat_files_.push_back(oat_file); 619 return oat_file; 620} 621 622OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 623 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 624 OatFile* oat_file = space->ReleaseOatFile(); 625 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 626 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 627 return *oat_file; 628} 629 630const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 631 const char* dex_location = dex_file.GetLocation().c_str(); 632 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 633 return FindOpenedOatFileFromDexLocation(dex_location, &dex_location_checksum); 634} 635 636const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation( 637 const char* dex_location, const uint32_t* const dex_location_checksum) { 638 ReaderMutexLock mu(Thread::Current(), dex_lock_); 639 for (size_t i = 0; i < oat_files_.size(); i++) { 640 const OatFile* oat_file = oat_files_[i]; 641 DCHECK(oat_file != NULL); 642 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 643 dex_location_checksum, 644 false); 645 if (oat_dex_file != NULL) { 646 return oat_file; 647 } 648 } 649 return NULL; 650} 651 652const DexFile* ClassLinker::FindDexFileInOatLocation(const char* dex_location, 653 uint32_t dex_location_checksum, 654 const char* oat_location, 655 std::string* error_msg) { 656 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 657 !Runtime::Current()->IsCompiler(), 658 error_msg)); 659 if (oat_file.get() == nullptr) { 660 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 661 error_msg->c_str()); 662 return nullptr; 663 } 664 Runtime* runtime = Runtime::Current(); 665 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 666 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 667 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 668 if (expected_image_oat_checksum != actual_image_oat_checksum) { 669 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 670 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 671 actual_image_oat_checksum); 672 return nullptr; 673 } 674 675 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 676 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 677 if (expected_image_oat_offset != actual_image_oat_offset) { 678 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 679 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 680 actual_image_oat_offset); 681 return nullptr; 682 } 683 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 684 &dex_location_checksum); 685 if (oat_dex_file == nullptr) { 686 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 687 dex_location); 688 return nullptr; 689 } 690 uint32_t expected_dex_checksum = dex_location_checksum; 691 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 692 if (expected_dex_checksum != actual_dex_checksum) { 693 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 694 "found 0x%x", oat_location, expected_dex_checksum, 695 actual_dex_checksum); 696 return nullptr; 697 } 698 const DexFile* dex_file = oat_dex_file->OpenDexFile(error_msg); 699 if (dex_file != nullptr) { 700 RegisterOatFile(oat_file.release()); 701 } 702 return dex_file; 703} 704 705const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation( 706 const char* dex_location, 707 uint32_t dex_location_checksum, 708 const char* oat_location, 709 std::vector<std::string>* error_msgs) { 710 // We play a locking game here so that if two different processes 711 // race to generate (or worse, one tries to open a partial generated 712 // file) we will be okay. This is actually common with apps that use 713 // DexClassLoader to work around the dex method reference limit and 714 // that have a background service running in a separate process. 715 ScopedFlock scoped_flock; 716 std::string error_msg; 717 if (!scoped_flock.Init(oat_location, &error_msg)) { 718 error_msgs->push_back(error_msg); 719 return nullptr; 720 } 721 722 // Check if we already have an up-to-date output file 723 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, dex_location_checksum, 724 oat_location, &error_msg); 725 if (dex_file != nullptr) { 726 return dex_file; 727 } 728 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 729 dex_location, oat_location, error_msg.c_str()); 730 VLOG(class_linker) << compound_msg; 731 error_msgs->push_back(compound_msg); 732 733 // Generate the output oat file for the dex file 734 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 735 if (!GenerateOatFile(dex_location, scoped_flock.GetFile()->Fd(), oat_location, &error_msg)) { 736 CHECK(!error_msg.empty()); 737 error_msgs->push_back(error_msg); 738 return nullptr; 739 } 740 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 741 !Runtime::Current()->IsCompiler(), 742 &error_msg)); 743 if (oat_file.get() == nullptr) { 744 compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 745 oat_location, error_msg.c_str()); 746 error_msgs->push_back(compound_msg); 747 return nullptr; 748 } 749 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 750 &dex_location_checksum); 751 if (oat_dex_file == nullptr) { 752 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out file " 753 "'%s'", dex_location, dex_location_checksum, oat_location); 754 error_msgs->push_back(error_msg); 755 return nullptr; 756 } 757 const DexFile* result = oat_dex_file->OpenDexFile(&error_msg); 758 CHECK(result != nullptr) << error_msgs << ", " << error_msg; 759 CHECK_EQ(dex_location_checksum, result->GetLocationChecksum()) 760 << "dex_location=" << dex_location << " oat_location=" << oat_location << std::hex 761 << " dex_location_checksum=" << dex_location_checksum 762 << " DexFile::GetLocationChecksum()=" << result->GetLocationChecksum(); 763 RegisterOatFile(oat_file.release()); 764 return result; 765} 766 767bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 768 const char* dex_location, 769 uint32_t dex_location_checksum, 770 const InstructionSet instruction_set, 771 std::string* error_msg) { 772 Runtime* runtime = Runtime::Current(); 773 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 774 775 // If the requested instruction set is the same as the current runtime, 776 // we can use the checksums directly. If it isn't, we'll have to read the 777 // image header from the image for the right instruction set. 778 uint32_t image_oat_checksum = 0; 779 uintptr_t image_oat_data_begin = 0; 780 if (instruction_set == kRuntimeISA) { 781 const ImageHeader& image_header = image_space->GetImageHeader(); 782 image_oat_checksum = image_header.GetOatChecksum(); 783 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 784 } else { 785 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 786 image_space->GetImageLocation().c_str(), instruction_set)); 787 image_oat_checksum = image_header->GetOatChecksum(); 788 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 789 } 790 const OatHeader& oat_header = oat_file->GetOatHeader(); 791 bool image_check = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 792 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 793 794 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 795 &dex_location_checksum); 796 if (oat_dex_file == NULL) { 797 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 798 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 799 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 800 for (size_t i = 0; i < oat_dex_files.size(); i++) { 801 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 802 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 803 oat_file->GetLocation().c_str(), 804 oat_dex_file->GetDexFileLocation().c_str()); 805 } 806 return false; 807 } 808 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 809 810 if (image_check && dex_check) { 811 return true; 812 } 813 814 if (!image_check) { 815 ScopedObjectAccess soa(Thread::Current()); 816 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with (0x%x, %" PRIdPTR ")", 817 oat_file->GetLocation().c_str(), 818 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 819 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 820 image_oat_checksum, image_oat_data_begin); 821 } 822 if (!dex_check) { 823 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 824 oat_file->GetLocation().c_str(), 825 oat_dex_file->GetDexFileLocationChecksum(), 826 dex_location, dex_location_checksum); 827 } 828 return false; 829} 830 831const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const std::string& oat_file_location, 832 const char* dex_location, 833 std::string* error_msg, 834 bool* open_failed) { 835 std::unique_ptr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 836 if (oat_file.get() == nullptr) { 837 *open_failed = true; 838 return nullptr; 839 } 840 *open_failed = false; 841 const DexFile* dex_file = nullptr; 842 uint32_t dex_location_checksum; 843 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 844 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 845 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 846 // directory. 847 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 848 if (oat_dex_file == nullptr) { 849 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 850 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 851 error_msg->c_str()); 852 return nullptr; 853 } 854 dex_file = oat_dex_file->OpenDexFile(error_msg); 855 } else { 856 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 857 kRuntimeISA, error_msg); 858 if (!verified) { 859 return nullptr; 860 } 861 dex_file = oat_file->GetOatDexFile(dex_location, 862 &dex_location_checksum)->OpenDexFile(error_msg); 863 } 864 if (dex_file != nullptr) { 865 RegisterOatFile(oat_file.release()); 866 } 867 return dex_file; 868} 869 870const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation( 871 const char* dex_location, 872 const uint32_t* const dex_location_checksum, 873 InstructionSet isa, 874 std::vector<std::string>* error_msgs) { 875 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location, 876 dex_location_checksum); 877 if (open_oat_file != nullptr) { 878 const OatFile::OatDexFile* oat_dex_file = open_oat_file->GetOatDexFile(dex_location, 879 dex_location_checksum); 880 std::string error_msg; 881 const DexFile* ret = oat_dex_file->OpenDexFile(&error_msg); 882 if (ret == nullptr) { 883 error_msgs->push_back(error_msg); 884 } 885 return ret; 886 } 887 888 // Look for an existing file next to dex. for example, for 889 // /foo/bar/baz.jar, look for /foo/bar/<isa>/baz.odex. 890 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 891 bool open_failed; 892 std::string error_msg; 893 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(odex_filename, dex_location, 894 &error_msg, &open_failed); 895 if (dex_file != nullptr) { 896 return dex_file; 897 } 898 if (dex_location_checksum == nullptr) { 899 error_msgs->push_back(StringPrintf("Failed to open oat file from %s and no classes.dex found in" 900 "%s: %s", odex_filename.c_str(), dex_location, 901 error_msg.c_str())); 902 return nullptr; 903 } 904 905 std::string cache_error_msg; 906 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 907 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location, 908 dalvik_cache.c_str())); 909 dex_file = VerifyAndOpenDexFileFromOatFile(cache_location, dex_location, &cache_error_msg, 910 &open_failed); 911 if (dex_file != nullptr) { 912 return dex_file; 913 } 914 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 915 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 916 } 917 std::string compound_msg = StringPrintf("Failed to open oat file from %s (error '%s') or %s " 918 "(error '%s').", odex_filename.c_str(), error_msg.c_str(), 919 cache_location.c_str(), cache_error_msg.c_str()); 920 VLOG(class_linker) << compound_msg; 921 error_msgs->push_back(compound_msg); 922 923 // Try to generate oat file if it wasn't found or was obsolete. 924 return FindOrCreateOatFileForDexLocation(dex_location, *dex_location_checksum, 925 cache_location.c_str(), error_msgs); 926} 927 928const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 929 ReaderMutexLock mu(Thread::Current(), dex_lock_); 930 for (size_t i = 0; i < oat_files_.size(); i++) { 931 const OatFile* oat_file = oat_files_[i]; 932 DCHECK(oat_file != nullptr); 933 if (oat_file->GetLocation() == oat_location) { 934 return oat_file; 935 } 936 } 937 return nullptr; 938} 939 940const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 941 std::string* error_msg) { 942 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 943 if (oat_file != nullptr) { 944 return oat_file; 945 } 946 947 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 948 error_msg); 949 if (oat_file == NULL) { 950 return NULL; 951 } 952 return oat_file; 953} 954 955static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 956 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 957 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 958 959 DCHECK(obj != NULL); 960 DCHECK(class_linker != NULL); 961 962 if (obj->IsArtMethod()) { 963 mirror::ArtMethod* method = obj->AsArtMethod(); 964 if (!method->IsNative()) { 965 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 966 if (method != Runtime::Current()->GetResolutionMethod()) { 967 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 968 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 969 } 970 } 971 } 972} 973 974void ClassLinker::InitFromImage() { 975 VLOG(startup) << "ClassLinker::InitFromImage entering"; 976 CHECK(!init_done_); 977 978 Thread* self = Thread::Current(); 979 gc::Heap* heap = Runtime::Current()->GetHeap(); 980 gc::space::ImageSpace* space = heap->GetImageSpace(); 981 dex_cache_image_class_lookup_required_ = true; 982 CHECK(space != NULL); 983 OatFile& oat_file = GetImageOatFile(space); 984 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 985 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 986 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 987 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 988 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 989 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 990 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 991 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 992 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 993 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 994 mirror::ObjectArray<mirror::DexCache>* dex_caches = 995 dex_caches_object->AsObjectArray<mirror::DexCache>(); 996 997 StackHandleScope<1> hs(self); 998 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 999 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1000 AsObjectArray<mirror::Class>())); 1001 class_roots_ = class_roots.Get(); 1002 1003 // Special case of setting up the String class early so that we can test arbitrary objects 1004 // as being Strings or not 1005 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1006 1007 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1008 static_cast<uint32_t>(dex_caches->GetLength())); 1009 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1010 StackHandleScope<1> hs(self); 1011 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1012 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1013 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1014 nullptr); 1015 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1016 std::string error_msg; 1017 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1018 if (dex_file == NULL) { 1019 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1020 << " from within oat file " << oat_file.GetLocation() 1021 << " error '" << error_msg << "'"; 1022 } 1023 1024 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1025 1026 AppendToBootClassPath(*dex_file, dex_cache); 1027 } 1028 1029 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1030 // bitmap walk. 1031 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1032 1033 // Set entry point to interpreter if in InterpretOnly mode. 1034 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1035 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1036 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1037 } 1038 1039 // reinit class_roots_ 1040 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1041 class_roots_ = class_roots.Get(); 1042 1043 // reinit array_iftable_ from any array class instance, they should be == 1044 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1045 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1046 // String class root was set above 1047 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1048 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1049 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1050 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1051 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1052 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1053 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1054 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1055 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1056 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1057 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1058 1059 FinishInit(self); 1060 1061 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1062} 1063 1064void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1065 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1066 if ((flags & kVisitRootFlagAllRoots) != 0) { 1067 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1068 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1069 } 1070 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1071 for (auto& pair : new_class_roots_) { 1072 mirror::Object* old_ref = pair.second; 1073 callback(reinterpret_cast<mirror::Object**>(&pair.second), arg, 0, kRootStickyClass); 1074 if (UNLIKELY(pair.second != old_ref)) { 1075 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1076 // corresponding object. This is slow, but luckily for us, this may only happen with a 1077 // concurrent moving GC. 1078 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1079 it != end && it->first == pair.first; ++it) { 1080 // If the class stored matches the old class, update it to the new value. 1081 if (old_ref == it->second) { 1082 it->second = pair.second; 1083 } 1084 } 1085 } 1086 } 1087 } 1088 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1089 new_class_roots_.clear(); 1090 } 1091 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1092 log_new_class_table_roots_ = true; 1093 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1094 log_new_class_table_roots_ = false; 1095 } 1096 // We deliberately ignore the class roots in the image since we 1097 // handle image roots by using the MS/CMS rescanning of dirty cards. 1098} 1099 1100// Keep in sync with InitCallback. Anything we visit, we need to 1101// reinit references to when reinitializing a ClassLinker from a 1102// mapped image. 1103void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1104 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1105 Thread* self = Thread::Current(); 1106 { 1107 ReaderMutexLock mu(self, dex_lock_); 1108 if ((flags & kVisitRootFlagAllRoots) != 0) { 1109 for (mirror::DexCache*& dex_cache : dex_caches_) { 1110 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1111 } 1112 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1113 for (size_t index : new_dex_cache_roots_) { 1114 callback(reinterpret_cast<mirror::Object**>(&dex_caches_[index]), arg, 0, kRootVMInternal); 1115 } 1116 } 1117 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1118 new_dex_cache_roots_.clear(); 1119 } 1120 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1121 log_new_dex_caches_roots_ = true; 1122 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1123 log_new_dex_caches_roots_ = false; 1124 } 1125 } 1126 VisitClassRoots(callback, arg, flags); 1127 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1128 DCHECK(array_iftable_ != nullptr); 1129 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1130 if (find_array_class_cache_[i] != nullptr) { 1131 callback(reinterpret_cast<mirror::Object**>(&find_array_class_cache_[i]), arg, 0, 1132 kRootVMInternal); 1133 } 1134 } 1135} 1136 1137void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1138 if (dex_cache_image_class_lookup_required_) { 1139 MoveImageClassesToClassTable(); 1140 } 1141 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1142 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1143 mirror::Class** root = &it.second; 1144 mirror::Class* c = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 1145 if (!visitor(c, arg)) { 1146 return; 1147 } 1148 } 1149} 1150 1151static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1152 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1153 classes->insert(c); 1154 return true; 1155} 1156 1157void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1158 std::set<mirror::Class*> classes; 1159 VisitClasses(GetClassesVisitor, &classes); 1160 for (mirror::Class* klass : classes) { 1161 if (!visitor(klass, arg)) { 1162 return; 1163 } 1164 } 1165} 1166 1167ClassLinker::~ClassLinker() { 1168 mirror::Class::ResetClass(); 1169 mirror::String::ResetClass(); 1170 mirror::ArtField::ResetClass(); 1171 mirror::ArtMethod::ResetClass(); 1172 mirror::BooleanArray::ResetArrayClass(); 1173 mirror::ByteArray::ResetArrayClass(); 1174 mirror::CharArray::ResetArrayClass(); 1175 mirror::DoubleArray::ResetArrayClass(); 1176 mirror::FloatArray::ResetArrayClass(); 1177 mirror::IntArray::ResetArrayClass(); 1178 mirror::LongArray::ResetArrayClass(); 1179 mirror::ShortArray::ResetArrayClass(); 1180 mirror::Throwable::ResetClass(); 1181 mirror::StackTraceElement::ResetClass(); 1182 STLDeleteElements(&boot_class_path_); 1183 STLDeleteElements(&oat_files_); 1184} 1185 1186mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1187 gc::Heap* heap = Runtime::Current()->GetHeap(); 1188 StackHandleScope<16> hs(self); 1189 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1190 Handle<mirror::DexCache> dex_cache( 1191 hs.NewHandle(down_cast<mirror::DexCache*>( 1192 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1193 VoidFunctor())))); 1194 if (dex_cache.Get() == NULL) { 1195 return NULL; 1196 } 1197 Handle<mirror::String> 1198 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1199 if (location.Get() == NULL) { 1200 return NULL; 1201 } 1202 Handle<mirror::ObjectArray<mirror::String>> 1203 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1204 if (strings.Get() == NULL) { 1205 return NULL; 1206 } 1207 Handle<mirror::ObjectArray<mirror::Class>> 1208 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1209 if (types.Get() == NULL) { 1210 return NULL; 1211 } 1212 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1213 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1214 if (methods.Get() == NULL) { 1215 return NULL; 1216 } 1217 Handle<mirror::ObjectArray<mirror::ArtField>> 1218 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1219 if (fields.Get() == NULL) { 1220 return NULL; 1221 } 1222 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1223 fields.Get()); 1224 return dex_cache.Get(); 1225} 1226 1227// Used to initialize a class in the allocation code path to ensure it is guarded by a StoreStore 1228// fence. 1229class InitializeClassVisitor { 1230 public: 1231 explicit InitializeClassVisitor(uint32_t class_size) : class_size_(class_size) { 1232 } 1233 1234 void operator()(mirror::Object* obj, size_t usable_size) const 1235 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1236 DCHECK_LE(class_size_, usable_size); 1237 // Avoid AsClass as object is not yet in live bitmap or allocation stack. 1238 mirror::Class* klass = down_cast<mirror::Class*>(obj); 1239 // DCHECK(klass->IsClass()); 1240 klass->SetClassSize(class_size_); 1241 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1242 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1243 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1244 } 1245 1246 private: 1247 const uint32_t class_size_; 1248 1249 DISALLOW_COPY_AND_ASSIGN(InitializeClassVisitor); 1250}; 1251 1252mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1253 uint32_t class_size) { 1254 DCHECK_GE(class_size, sizeof(mirror::Class)); 1255 gc::Heap* heap = Runtime::Current()->GetHeap(); 1256 InitializeClassVisitor visitor(class_size); 1257 mirror::Object* k = kMovingClasses ? 1258 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1259 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1260 if (UNLIKELY(k == nullptr)) { 1261 CHECK(self->IsExceptionPending()); // OOME. 1262 return nullptr; 1263 } 1264 return k->AsClass(); 1265} 1266 1267mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1268 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1269} 1270 1271mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1272 return down_cast<mirror::ArtField*>( 1273 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1274} 1275 1276mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1277 return down_cast<mirror::ArtMethod*>( 1278 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1279} 1280 1281mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1282 Thread* self, size_t length) { 1283 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1284 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1285} 1286 1287static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1288 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1289 DCHECK(klass != NULL); 1290 // Wait for the class if it has not already been linked. 1291 if (!klass->IsResolved() && !klass->IsErroneous()) { 1292 StackHandleScope<1> hs(self); 1293 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1294 ObjectLock<mirror::Class> lock(self, h_class); 1295 // Check for circular dependencies between classes. 1296 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1297 ThrowClassCircularityError(h_class.Get()); 1298 h_class->SetStatus(mirror::Class::kStatusError, self); 1299 return nullptr; 1300 } 1301 // Wait for the pending initialization to complete. 1302 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1303 lock.WaitIgnoringInterrupts(); 1304 } 1305 } 1306 if (klass->IsErroneous()) { 1307 ThrowEarlierClassFailure(klass); 1308 return nullptr; 1309 } 1310 // Return the loaded class. No exceptions should be pending. 1311 CHECK(klass->IsResolved()) << PrettyClass(klass); 1312 self->AssertNoPendingException(); 1313 return klass; 1314} 1315 1316mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1317 Handle<mirror::ClassLoader> class_loader) { 1318 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1319 DCHECK(self != nullptr); 1320 self->AssertNoPendingException(); 1321 if (descriptor[1] == '\0') { 1322 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1323 // for primitive classes that aren't backed by dex files. 1324 return FindPrimitiveClass(descriptor[0]); 1325 } 1326 // Find the class in the loaded classes table. 1327 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1328 if (klass != NULL) { 1329 return EnsureResolved(self, klass); 1330 } 1331 // Class is not yet loaded. 1332 if (descriptor[0] == '[') { 1333 return CreateArrayClass(self, descriptor, class_loader); 1334 } else if (class_loader.Get() == nullptr) { 1335 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1336 if (pair.second != NULL) { 1337 StackHandleScope<1> hs(self); 1338 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1339 } 1340 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1341 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1342 // throw of a NoClassDefFoundError. 1343 if (IsInBootClassPath(descriptor)) { 1344 mirror::Class* system_class = FindSystemClass(self, descriptor); 1345 CHECK(system_class != NULL); 1346 return system_class; 1347 } 1348 // Next try the compile time class path. 1349 const std::vector<const DexFile*>* class_path; 1350 { 1351 ScopedObjectAccessUnchecked soa(self); 1352 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1353 soa.AddLocalReference<jobject>(class_loader.Get())); 1354 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1355 } 1356 1357 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1358 if (pair.second != NULL) { 1359 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1360 } 1361 1362 } else { 1363 ScopedObjectAccessUnchecked soa(self); 1364 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1365 soa.AddLocalReference<jobject>(class_loader.Get())); 1366 std::string class_name_string(DescriptorToDot(descriptor)); 1367 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1368 { 1369 ScopedThreadStateChange tsc(self, kNative); 1370 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1371 soa.Env()->NewStringUTF(class_name_string.c_str())); 1372 if (class_name_object.get() == NULL) { 1373 return NULL; 1374 } 1375 CHECK(class_loader_object.get() != NULL); 1376 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1377 WellKnownClasses::java_lang_ClassLoader_loadClass, 1378 class_name_object.get())); 1379 } 1380 if (self->IsExceptionPending()) { 1381 // If the ClassLoader threw, pass that exception up. 1382 return NULL; 1383 } else if (result.get() == NULL) { 1384 // broken loader - throw NPE to be compatible with Dalvik 1385 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1386 class_name_string.c_str()).c_str()); 1387 return NULL; 1388 } else { 1389 // success, return mirror::Class* 1390 return soa.Decode<mirror::Class*>(result.get()); 1391 } 1392 } 1393 1394 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1395 return NULL; 1396} 1397 1398mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1399 Handle<mirror::ClassLoader> class_loader, 1400 const DexFile& dex_file, 1401 const DexFile::ClassDef& dex_class_def) { 1402 Thread* self = Thread::Current(); 1403 StackHandleScope<2> hs(self); 1404 auto klass = hs.NewHandle<mirror::Class>(nullptr); 1405 // Load the class from the dex file. 1406 if (UNLIKELY(!init_done_)) { 1407 // finish up init of hand crafted class_roots_ 1408 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1409 klass.Assign(GetClassRoot(kJavaLangObject)); 1410 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1411 klass.Assign(GetClassRoot(kJavaLangClass)); 1412 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1413 klass.Assign(GetClassRoot(kJavaLangString)); 1414 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1415 klass.Assign(GetClassRoot(kJavaLangDexCache)); 1416 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1417 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 1418 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1419 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 1420 } else { 1421 klass.Assign(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1422 } 1423 } else { 1424 klass.Assign(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1425 } 1426 if (UNLIKELY(klass.Get() == NULL)) { 1427 CHECK(self->IsExceptionPending()); // Expect an OOME. 1428 return NULL; 1429 } 1430 klass->SetDexCache(FindDexCache(dex_file)); 1431 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 1432 // Check for a pending exception during load 1433 if (self->IsExceptionPending()) { 1434 klass->SetStatus(mirror::Class::kStatusError, self); 1435 return NULL; 1436 } 1437 ObjectLock<mirror::Class> lock(self, klass); 1438 klass->SetClinitThreadId(self->GetTid()); 1439 // Add the newly loaded class to the loaded classes table. 1440 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 1441 if (existing != NULL) { 1442 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1443 // this thread to block. 1444 return EnsureResolved(self, existing); 1445 } 1446 // Finish loading (if necessary) by finding parents 1447 CHECK(!klass->IsLoaded()); 1448 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1449 // Loading failed. 1450 klass->SetStatus(mirror::Class::kStatusError, self); 1451 return NULL; 1452 } 1453 CHECK(klass->IsLoaded()); 1454 // Link the class (if necessary) 1455 CHECK(!klass->IsResolved()); 1456 // TODO: Use fast jobjects? 1457 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1458 if (!LinkClass(self, klass, interfaces)) { 1459 // Linking failed. 1460 klass->SetStatus(mirror::Class::kStatusError, self); 1461 return NULL; 1462 } 1463 CHECK(klass->IsResolved()); 1464 1465 /* 1466 * We send CLASS_PREPARE events to the debugger from here. The 1467 * definition of "preparation" is creating the static fields for a 1468 * class and initializing them to the standard default values, but not 1469 * executing any code (that comes later, during "initialization"). 1470 * 1471 * We did the static preparation in LinkClass. 1472 * 1473 * The class has been prepared and resolved but possibly not yet verified 1474 * at this point. 1475 */ 1476 Dbg::PostClassPrepare(klass.Get()); 1477 1478 return klass.Get(); 1479} 1480 1481// Precomputes size that will be needed for Class, matching LinkStaticFields 1482uint32_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1483 const DexFile::ClassDef& dex_class_def) { 1484 const byte* class_data = dex_file.GetClassData(dex_class_def); 1485 size_t num_ref = 0; 1486 size_t num_32 = 0; 1487 size_t num_64 = 0; 1488 if (class_data != NULL) { 1489 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1490 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1491 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1492 char c = descriptor[0]; 1493 if (c == 'L' || c == '[') { 1494 num_ref++; 1495 } else if (c == 'J' || c == 'D') { 1496 num_64++; 1497 } else { 1498 num_32++; 1499 } 1500 } 1501 } 1502 // start with generic class data 1503 uint32_t size = sizeof(mirror::Class); 1504 // follow with reference fields which must be contiguous at start 1505 size += (num_ref * sizeof(uint32_t)); 1506 // if there are 64-bit fields to add, make sure they are aligned 1507 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1508 if (num_32 != 0) { 1509 // use an available 32-bit field for padding 1510 num_32--; 1511 } 1512 size += sizeof(uint32_t); // either way, we are adding a word 1513 DCHECK_EQ(size, RoundUp(size, 8)); 1514 } 1515 // tack on any 64-bit fields now that alignment is assured 1516 size += (num_64 * sizeof(uint64_t)); 1517 // tack on any remaining 32-bit fields 1518 size += (num_32 * sizeof(uint32_t)); 1519 return size; 1520} 1521 1522OatFile::OatClass ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1523 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1524 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1525 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1526 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1527 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1528 &dex_location_checksum); 1529 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1530 return oat_dex_file->GetOatClass(class_def_idx); 1531} 1532 1533static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1534 uint32_t method_idx) { 1535 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1536 const byte* class_data = dex_file.GetClassData(class_def); 1537 CHECK(class_data != NULL); 1538 ClassDataItemIterator it(dex_file, class_data); 1539 // Skip fields 1540 while (it.HasNextStaticField()) { 1541 it.Next(); 1542 } 1543 while (it.HasNextInstanceField()) { 1544 it.Next(); 1545 } 1546 // Process methods 1547 size_t class_def_method_index = 0; 1548 while (it.HasNextDirectMethod()) { 1549 if (it.GetMemberIndex() == method_idx) { 1550 return class_def_method_index; 1551 } 1552 class_def_method_index++; 1553 it.Next(); 1554 } 1555 while (it.HasNextVirtualMethod()) { 1556 if (it.GetMemberIndex() == method_idx) { 1557 return class_def_method_index; 1558 } 1559 class_def_method_index++; 1560 it.Next(); 1561 } 1562 DCHECK(!it.HasNext()); 1563 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1564 return 0; 1565} 1566 1567const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1568 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1569 // method for direct methods (or virtual methods made direct). 1570 mirror::Class* declaring_class = method->GetDeclaringClass(); 1571 size_t oat_method_index; 1572 if (method->IsStatic() || method->IsDirect()) { 1573 // Simple case where the oat method index was stashed at load time. 1574 oat_method_index = method->GetMethodIndex(); 1575 } else { 1576 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1577 // by search for its position in the declared virtual methods. 1578 oat_method_index = declaring_class->NumDirectMethods(); 1579 size_t end = declaring_class->NumVirtualMethods(); 1580 bool found = false; 1581 for (size_t i = 0; i < end; i++) { 1582 if (declaring_class->GetVirtualMethod(i) == method) { 1583 found = true; 1584 break; 1585 } 1586 oat_method_index++; 1587 } 1588 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1589 } 1590 DCHECK_EQ(oat_method_index, 1591 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1592 method->GetDeclaringClass()->GetDexClassDefIndex(), 1593 method->GetDexMethodIndex())); 1594 const OatFile::OatClass oat_class = GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1595 declaring_class->GetDexClassDefIndex()); 1596 1597 return oat_class.GetOatMethod(oat_method_index); 1598} 1599 1600// Special case to get oat code without overwriting a trampoline. 1601const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1602 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1603 if (method->IsProxyMethod()) { 1604 return GetQuickProxyInvokeHandler(); 1605 } 1606 const void* result = GetOatMethodFor(method).GetQuickCode(); 1607 if (result == nullptr) { 1608 if (method->IsNative()) { 1609 // No code and native? Use generic trampoline. 1610 result = GetQuickGenericJniTrampoline(); 1611 } else if (method->IsPortableCompiled()) { 1612 // No code? Do we expect portable code? 1613 result = GetQuickToPortableBridge(); 1614 } else { 1615 // No code? You must mean to go into the interpreter. 1616 result = GetQuickToInterpreterBridge(); 1617 } 1618 } 1619 return result; 1620} 1621 1622const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1623 bool* have_portable_code) { 1624 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1625 *have_portable_code = false; 1626 if (method->IsProxyMethod()) { 1627 return GetPortableProxyInvokeHandler(); 1628 } 1629 const OatFile::OatMethod oat_method = GetOatMethodFor(method); 1630 const void* result = oat_method.GetPortableCode(); 1631 if (result == nullptr) { 1632 if (oat_method.GetQuickCode() == nullptr) { 1633 // No code? You must mean to go into the interpreter. 1634 result = GetPortableToInterpreterBridge(); 1635 } else { 1636 // No code? But there's quick code, so use a bridge. 1637 result = GetPortableToQuickBridge(); 1638 } 1639 } else { 1640 *have_portable_code = true; 1641 } 1642 return result; 1643} 1644 1645const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1646 uint32_t method_idx) { 1647 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1648 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1649 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 1650} 1651 1652const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1653 uint32_t method_idx) { 1654 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1655 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1656 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 1657} 1658 1659// Returns true if the method must run with interpreter, false otherwise. 1660static bool NeedsInterpreter( 1661 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 1662 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1663 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1664 // No code: need interpreter. 1665 // May return true for native code, in the case of generic JNI 1666 // DCHECK(!method->IsNative()); 1667 return true; 1668 } 1669#ifdef ART_SEA_IR_MODE 1670 ScopedObjectAccess soa(Thread::Current()); 1671 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1672 LOG(INFO) << "Found " << PrettyMethod(method); 1673 return false; 1674 } 1675#endif 1676 // If interpreter mode is enabled, every method (except native and proxy) must 1677 // be run with interpreter. 1678 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1679 !method->IsNative() && !method->IsProxyMethod(); 1680} 1681 1682void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1683 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1684 if (klass->NumDirectMethods() == 0) { 1685 return; // No direct methods => no static methods. 1686 } 1687 Runtime* runtime = Runtime::Current(); 1688 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1689 return; // OAT file unavailable. 1690 } 1691 const DexFile& dex_file = klass->GetDexFile(); 1692 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 1693 CHECK(dex_class_def != nullptr); 1694 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1695 // There should always be class data if there were direct methods. 1696 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1697 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 1698 ClassDataItemIterator it(dex_file, class_data); 1699 // Skip fields 1700 while (it.HasNextStaticField()) { 1701 it.Next(); 1702 } 1703 while (it.HasNextInstanceField()) { 1704 it.Next(); 1705 } 1706 // Link the code of methods skipped by LinkCode. 1707 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1708 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1709 if (!method->IsStatic()) { 1710 // Only update static methods. 1711 continue; 1712 } 1713 const void* portable_code = oat_class.GetOatMethod(method_index).GetPortableCode(); 1714 const void* quick_code = oat_class.GetOatMethod(method_index).GetQuickCode(); 1715 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1716 bool have_portable_code = false; 1717 if (enter_interpreter) { 1718 // Use interpreter entry point. 1719 // Check whether the method is native, in which case it's generic JNI. 1720 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 1721 quick_code = GetQuickGenericJniTrampoline(); 1722 portable_code = GetPortableToQuickBridge(); 1723 } else { 1724 portable_code = GetPortableToInterpreterBridge(); 1725 quick_code = GetQuickToInterpreterBridge(); 1726 } 1727 } else { 1728 if (portable_code == nullptr) { 1729 portable_code = GetPortableToQuickBridge(); 1730 } else { 1731 have_portable_code = true; 1732 } 1733 if (quick_code == nullptr) { 1734 quick_code = GetQuickToPortableBridge(); 1735 } 1736 } 1737 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1738 have_portable_code); 1739 } 1740 // Ignore virtual methods on the iterator. 1741} 1742 1743void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 1744 const DexFile& dex_file, uint32_t dex_method_index, 1745 uint32_t method_index) { 1746 // Method shouldn't have already been linked. 1747 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1748 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1749 // Every kind of method should at least get an invoke stub from the oat_method. 1750 // non-abstract methods also get their code pointers. 1751 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1752 oat_method.LinkMethod(method.Get()); 1753 1754 // Install entry point from interpreter. 1755 Runtime* runtime = Runtime::Current(); 1756 bool enter_interpreter = NeedsInterpreter(method.Get(), 1757 method->GetEntryPointFromQuickCompiledCode(), 1758 method->GetEntryPointFromPortableCompiledCode()); 1759 if (enter_interpreter && !method->IsNative()) { 1760 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1761 } else { 1762 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1763 } 1764 1765 if (method->IsAbstract()) { 1766 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1767 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1768 return; 1769 } 1770 1771 bool have_portable_code = false; 1772 if (method->IsStatic() && !method->IsConstructor()) { 1773 // For static methods excluding the class initializer, install the trampoline. 1774 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1775 // after initializing class (see ClassLinker::InitializeClass method). 1776 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 1777 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 1778 } else if (enter_interpreter) { 1779 if (!method->IsNative()) { 1780 // Set entry point from compiled code if there's no code or in interpreter only mode. 1781 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1782 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1783 } else { 1784 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 1785 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1786 } 1787 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1788 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1789 have_portable_code = true; 1790 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1791 } else { 1792 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1793 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1794 } 1795 1796 if (method->IsNative()) { 1797 // Unregistering restores the dlsym lookup stub. 1798 method->UnregisterNative(Thread::Current()); 1799 1800 if (enter_interpreter) { 1801 // We have a native method here without code. Then it should have either the GenericJni 1802 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 1803 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 1804 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 1805 } 1806 } 1807 1808 // Allow instrumentation its chance to hijack code. 1809 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 1810 method->GetEntryPointFromQuickCompiledCode(), 1811 method->GetEntryPointFromPortableCompiledCode(), 1812 have_portable_code); 1813} 1814 1815void ClassLinker::LoadClass(const DexFile& dex_file, 1816 const DexFile::ClassDef& dex_class_def, 1817 Handle<mirror::Class> klass, 1818 mirror::ClassLoader* class_loader) { 1819 CHECK(klass.Get() != NULL); 1820 CHECK(klass->GetDexCache() != NULL); 1821 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1822 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1823 CHECK(descriptor != NULL); 1824 1825 klass->SetClass(GetClassRoot(kJavaLangClass)); 1826 if (kUseBakerOrBrooksReadBarrier) { 1827 klass->AssertReadBarrierPointer(); 1828 } 1829 uint32_t access_flags = dex_class_def.access_flags_; 1830 // Make sure that none of our runtime-only flags are set. 1831 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1832 klass->SetAccessFlags(access_flags); 1833 klass->SetClassLoader(class_loader); 1834 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1835 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1836 1837 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1838 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1839 1840 const byte* class_data = dex_file.GetClassData(dex_class_def); 1841 if (class_data == NULL) { 1842 return; // no fields or methods - for example a marker interface 1843 } 1844 1845 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1846 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 1847 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 1848 } else { 1849 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 1850 } 1851} 1852 1853void ClassLinker::LoadClassMembers(const DexFile& dex_file, 1854 const byte* class_data, 1855 Handle<mirror::Class> klass, 1856 mirror::ClassLoader* class_loader, 1857 const OatFile::OatClass* oat_class) { 1858 // Load fields. 1859 ClassDataItemIterator it(dex_file, class_data); 1860 Thread* self = Thread::Current(); 1861 if (it.NumStaticFields() != 0) { 1862 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1863 if (UNLIKELY(statics == NULL)) { 1864 CHECK(self->IsExceptionPending()); // OOME. 1865 return; 1866 } 1867 klass->SetSFields(statics); 1868 } 1869 if (it.NumInstanceFields() != 0) { 1870 mirror::ObjectArray<mirror::ArtField>* fields = 1871 AllocArtFieldArray(self, it.NumInstanceFields()); 1872 if (UNLIKELY(fields == NULL)) { 1873 CHECK(self->IsExceptionPending()); // OOME. 1874 return; 1875 } 1876 klass->SetIFields(fields); 1877 } 1878 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1879 StackHandleScope<1> hs(self); 1880 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 1881 if (UNLIKELY(sfield.Get() == NULL)) { 1882 CHECK(self->IsExceptionPending()); // OOME. 1883 return; 1884 } 1885 klass->SetStaticField(i, sfield.Get()); 1886 LoadField(dex_file, it, klass, sfield); 1887 } 1888 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1889 StackHandleScope<1> hs(self); 1890 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 1891 if (UNLIKELY(ifield.Get() == NULL)) { 1892 CHECK(self->IsExceptionPending()); // OOME. 1893 return; 1894 } 1895 klass->SetInstanceField(i, ifield.Get()); 1896 LoadField(dex_file, it, klass, ifield); 1897 } 1898 1899 // Load methods. 1900 if (it.NumDirectMethods() != 0) { 1901 // TODO: append direct methods to class object 1902 mirror::ObjectArray<mirror::ArtMethod>* directs = 1903 AllocArtMethodArray(self, it.NumDirectMethods()); 1904 if (UNLIKELY(directs == NULL)) { 1905 CHECK(self->IsExceptionPending()); // OOME. 1906 return; 1907 } 1908 klass->SetDirectMethods(directs); 1909 } 1910 if (it.NumVirtualMethods() != 0) { 1911 // TODO: append direct methods to class object 1912 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1913 AllocArtMethodArray(self, it.NumVirtualMethods()); 1914 if (UNLIKELY(virtuals == NULL)) { 1915 CHECK(self->IsExceptionPending()); // OOME. 1916 return; 1917 } 1918 klass->SetVirtualMethods(virtuals); 1919 } 1920 size_t class_def_method_index = 0; 1921 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1922 StackHandleScope<1> hs(self); 1923 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 1924 if (UNLIKELY(method.Get() == NULL)) { 1925 CHECK(self->IsExceptionPending()); // OOME. 1926 return; 1927 } 1928 klass->SetDirectMethod(i, method.Get()); 1929 if (oat_class != nullptr) { 1930 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 1931 } 1932 method->SetMethodIndex(class_def_method_index); 1933 class_def_method_index++; 1934 } 1935 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1936 StackHandleScope<1> hs(self); 1937 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 1938 if (UNLIKELY(method.Get() == NULL)) { 1939 CHECK(self->IsExceptionPending()); // OOME. 1940 return; 1941 } 1942 klass->SetVirtualMethod(i, method.Get()); 1943 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1944 if (oat_class != nullptr) { 1945 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 1946 } 1947 class_def_method_index++; 1948 } 1949 DCHECK(!it.HasNext()); 1950} 1951 1952void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1953 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 1954 uint32_t field_idx = it.GetMemberIndex(); 1955 dst->SetDexFieldIndex(field_idx); 1956 dst->SetDeclaringClass(klass.Get()); 1957 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1958} 1959 1960mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1961 const ClassDataItemIterator& it, 1962 Handle<mirror::Class> klass) { 1963 uint32_t dex_method_idx = it.GetMemberIndex(); 1964 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1965 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 1966 1967 mirror::ArtMethod* dst = AllocArtMethod(self); 1968 if (UNLIKELY(dst == NULL)) { 1969 CHECK(self->IsExceptionPending()); // OOME. 1970 return NULL; 1971 } 1972 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 1973 1974 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 1975 dst->SetDexMethodIndex(dex_method_idx); 1976 dst->SetDeclaringClass(klass.Get()); 1977 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 1978 1979 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 1980 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 1981 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 1982 1983 uint32_t access_flags = it.GetMemberAccessFlags(); 1984 1985 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 1986 // Set finalizable flag on declaring class. 1987 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 1988 // Void return type. 1989 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 1990 klass->SetFinalizable(); 1991 } else { 1992 std::string klass_descriptor = klass->GetDescriptor(); 1993 // The Enum class declares a "final" finalize() method to prevent subclasses from 1994 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 1995 // subclasses, so we exclude it here. 1996 // We also want to avoid setting the flag on Object, where we know that finalize() is 1997 // empty. 1998 if (klass_descriptor.compare("Ljava/lang/Object;") != 0 && 1999 klass_descriptor.compare("Ljava/lang/Enum;") != 0) { 2000 klass->SetFinalizable(); 2001 } 2002 } 2003 } 2004 } else if (method_name[0] == '<') { 2005 // Fix broken access flags for initializers. Bug 11157540. 2006 bool is_init = (strcmp("<init>", method_name) == 0); 2007 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2008 if (UNLIKELY(!is_init && !is_clinit)) { 2009 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2010 } else { 2011 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2012 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2013 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2014 access_flags |= kAccConstructor; 2015 } 2016 } 2017 } 2018 dst->SetAccessFlags(access_flags); 2019 2020 self->EndAssertNoThreadSuspension(old_cause); 2021 return dst; 2022} 2023 2024void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2025 Thread* self = Thread::Current(); 2026 StackHandleScope<1> hs(self); 2027 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2028 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2029 AppendToBootClassPath(dex_file, dex_cache); 2030} 2031 2032void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2033 Handle<mirror::DexCache> dex_cache) { 2034 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2035 boot_class_path_.push_back(&dex_file); 2036 RegisterDexFile(dex_file, dex_cache); 2037} 2038 2039bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 2040 dex_lock_.AssertSharedHeld(Thread::Current()); 2041 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2042 if (dex_caches_[i]->GetDexFile() == &dex_file) { 2043 return true; 2044 } 2045 } 2046 return false; 2047} 2048 2049bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 2050 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2051 return IsDexFileRegisteredLocked(dex_file); 2052} 2053 2054void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2055 Handle<mirror::DexCache> dex_cache) { 2056 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2057 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2058 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2059 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2060 dex_caches_.push_back(dex_cache.Get()); 2061 dex_cache->SetDexFile(&dex_file); 2062 if (log_new_dex_caches_roots_) { 2063 // TODO: This is not safe if we can remove dex caches. 2064 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2065 } 2066} 2067 2068void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2069 Thread* self = Thread::Current(); 2070 { 2071 ReaderMutexLock mu(self, dex_lock_); 2072 if (IsDexFileRegisteredLocked(dex_file)) { 2073 return; 2074 } 2075 } 2076 // Don't alloc while holding the lock, since allocation may need to 2077 // suspend all threads and another thread may need the dex_lock_ to 2078 // get to a suspend point. 2079 StackHandleScope<1> hs(self); 2080 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2081 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2082 { 2083 WriterMutexLock mu(self, dex_lock_); 2084 if (IsDexFileRegisteredLocked(dex_file)) { 2085 return; 2086 } 2087 RegisterDexFileLocked(dex_file, dex_cache); 2088 } 2089} 2090 2091void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2092 Handle<mirror::DexCache> dex_cache) { 2093 WriterMutexLock mu(Thread::Current(), dex_lock_); 2094 RegisterDexFileLocked(dex_file, dex_cache); 2095} 2096 2097mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 2098 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2099 // Search assuming unique-ness of dex file. 2100 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2101 mirror::DexCache* dex_cache = dex_caches_[i]; 2102 if (dex_cache->GetDexFile() == &dex_file) { 2103 return dex_cache; 2104 } 2105 } 2106 // Search matching by location name. 2107 std::string location(dex_file.GetLocation()); 2108 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2109 mirror::DexCache* dex_cache = dex_caches_[i]; 2110 if (dex_cache->GetDexFile()->GetLocation() == location) { 2111 return dex_cache; 2112 } 2113 } 2114 // Failure, dump diagnostic and abort. 2115 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2116 mirror::DexCache* dex_cache = dex_caches_[i]; 2117 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2118 } 2119 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2120 return NULL; 2121} 2122 2123void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 2124 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2125 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2126 dex_caches_[i]->Fixup(resolution_method); 2127 } 2128} 2129 2130mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2131 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2132 if (UNLIKELY(klass == NULL)) { 2133 return NULL; 2134 } 2135 return InitializePrimitiveClass(klass, type); 2136} 2137 2138mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2139 Primitive::Type type) { 2140 CHECK(primitive_class != NULL); 2141 // Must hold lock on object when initializing. 2142 Thread* self = Thread::Current(); 2143 StackHandleScope<1> hs(self); 2144 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2145 ObjectLock<mirror::Class> lock(self, h_class); 2146 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2147 primitive_class->SetPrimitiveType(type); 2148 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2149 const char* descriptor = Primitive::Descriptor(type); 2150 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2151 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2152 return primitive_class; 2153} 2154 2155// Create an array class (i.e. the class object for the array, not the 2156// array itself). "descriptor" looks like "[C" or "[[[[B" or 2157// "[Ljava/lang/String;". 2158// 2159// If "descriptor" refers to an array of primitives, look up the 2160// primitive type's internally-generated class object. 2161// 2162// "class_loader" is the class loader of the class that's referring to 2163// us. It's used to ensure that we're looking for the element type in 2164// the right context. It does NOT become the class loader for the 2165// array class; that always comes from the base element class. 2166// 2167// Returns NULL with an exception raised on failure. 2168mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2169 Handle<mirror::ClassLoader> class_loader) { 2170 // Identify the underlying component type 2171 CHECK_EQ('[', descriptor[0]); 2172 StackHandleScope<2> hs(self); 2173 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2174 if (component_type.Get() == nullptr) { 2175 DCHECK(self->IsExceptionPending()); 2176 return nullptr; 2177 } 2178 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2179 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2180 return nullptr; 2181 } 2182 // See if the component type is already loaded. Array classes are 2183 // always associated with the class loader of their underlying 2184 // element type -- an array of Strings goes with the loader for 2185 // java/lang/String -- so we need to look for it there. (The 2186 // caller should have checked for the existence of the class 2187 // before calling here, but they did so with *their* class loader, 2188 // not the component type's loader.) 2189 // 2190 // If we find it, the caller adds "loader" to the class' initiating 2191 // loader list, which should prevent us from going through this again. 2192 // 2193 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2194 // are the same, because our caller (FindClass) just did the 2195 // lookup. (Even if we get this wrong we still have correct behavior, 2196 // because we effectively do this lookup again when we add the new 2197 // class to the hash table --- necessary because of possible races with 2198 // other threads.) 2199 if (class_loader.Get() != component_type->GetClassLoader()) { 2200 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2201 if (new_class != NULL) { 2202 return new_class; 2203 } 2204 } 2205 2206 // Fill out the fields in the Class. 2207 // 2208 // It is possible to execute some methods against arrays, because 2209 // all arrays are subclasses of java_lang_Object_, so we need to set 2210 // up a vtable. We can just point at the one in java_lang_Object_. 2211 // 2212 // Array classes are simple enough that we don't need to do a full 2213 // link step. 2214 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2215 if (UNLIKELY(!init_done_)) { 2216 // Classes that were hand created, ie not by FindSystemClass 2217 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2218 new_class.Assign(GetClassRoot(kClassArrayClass)); 2219 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2220 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2221 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2222 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2223 } else if (strcmp(descriptor, 2224 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2225 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2226 } else if (strcmp(descriptor, 2227 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2228 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2229 } else if (strcmp(descriptor, "[C") == 0) { 2230 new_class.Assign(GetClassRoot(kCharArrayClass)); 2231 } else if (strcmp(descriptor, "[I") == 0) { 2232 new_class.Assign(GetClassRoot(kIntArrayClass)); 2233 } 2234 } 2235 if (new_class.Get() == nullptr) { 2236 new_class.Assign(AllocClass(self, sizeof(mirror::Class))); 2237 if (new_class.Get() == nullptr) { 2238 return nullptr; 2239 } 2240 new_class->SetComponentType(component_type.Get()); 2241 } 2242 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2243 DCHECK(new_class->GetComponentType() != NULL); 2244 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2245 new_class->SetSuperClass(java_lang_Object); 2246 new_class->SetVTable(java_lang_Object->GetVTable()); 2247 new_class->SetPrimitiveType(Primitive::kPrimNot); 2248 new_class->SetClassLoader(component_type->GetClassLoader()); 2249 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2250 // don't need to set new_class->SetObjectSize(..) 2251 // because Object::SizeOf delegates to Array::SizeOf 2252 2253 2254 // All arrays have java/lang/Cloneable and java/io/Serializable as 2255 // interfaces. We need to set that up here, so that stuff like 2256 // "instanceof" works right. 2257 // 2258 // Note: The GC could run during the call to FindSystemClass, 2259 // so we need to make sure the class object is GC-valid while we're in 2260 // there. Do this by clearing the interface list so the GC will just 2261 // think that the entries are null. 2262 2263 2264 // Use the single, global copies of "interfaces" and "iftable" 2265 // (remember not to free them for arrays). 2266 CHECK(array_iftable_ != nullptr); 2267 new_class->SetIfTable(array_iftable_); 2268 2269 // Inherit access flags from the component type. 2270 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2271 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2272 access_flags &= kAccJavaFlagsMask; 2273 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2274 // and remove "interface". 2275 access_flags |= kAccAbstract | kAccFinal; 2276 access_flags &= ~kAccInterface; 2277 2278 new_class->SetAccessFlags(access_flags); 2279 2280 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2281 if (existing == nullptr) { 2282 return new_class.Get(); 2283 } 2284 // Another thread must have loaded the class after we 2285 // started but before we finished. Abandon what we've 2286 // done. 2287 // 2288 // (Yes, this happens.) 2289 2290 return existing; 2291} 2292 2293mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2294 switch (type) { 2295 case 'B': 2296 return GetClassRoot(kPrimitiveByte); 2297 case 'C': 2298 return GetClassRoot(kPrimitiveChar); 2299 case 'D': 2300 return GetClassRoot(kPrimitiveDouble); 2301 case 'F': 2302 return GetClassRoot(kPrimitiveFloat); 2303 case 'I': 2304 return GetClassRoot(kPrimitiveInt); 2305 case 'J': 2306 return GetClassRoot(kPrimitiveLong); 2307 case 'S': 2308 return GetClassRoot(kPrimitiveShort); 2309 case 'Z': 2310 return GetClassRoot(kPrimitiveBoolean); 2311 case 'V': 2312 return GetClassRoot(kPrimitiveVoid); 2313 default: 2314 break; 2315 } 2316 std::string printable_type(PrintableChar(type)); 2317 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2318 return NULL; 2319} 2320 2321mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2322 size_t hash) { 2323 if (VLOG_IS_ON(class_linker)) { 2324 mirror::DexCache* dex_cache = klass->GetDexCache(); 2325 std::string source; 2326 if (dex_cache != NULL) { 2327 source += " from "; 2328 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2329 } 2330 LOG(INFO) << "Loaded class " << descriptor << source; 2331 } 2332 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2333 mirror::Class* existing = 2334 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2335 if (existing != NULL) { 2336 return existing; 2337 } 2338 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2339 // Check a class loaded with the system class loader matches one in the image if the class 2340 // is in the image. 2341 existing = LookupClassFromImage(descriptor); 2342 if (existing != NULL) { 2343 CHECK(klass == existing); 2344 } 2345 } 2346 VerifyObject(klass); 2347 class_table_.insert(std::make_pair(hash, klass)); 2348 if (log_new_class_table_roots_) { 2349 new_class_roots_.push_back(std::make_pair(hash, klass)); 2350 } 2351 return NULL; 2352} 2353 2354bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2355 size_t hash = Hash(descriptor); 2356 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2357 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2358 it != end && it->first == hash; 2359 ++it) { 2360 mirror::Class** root = &it->second; 2361 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2362 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2363 class_table_.erase(it); 2364 return true; 2365 } 2366 } 2367 return false; 2368} 2369 2370mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2371 const mirror::ClassLoader* class_loader) { 2372 size_t hash = Hash(descriptor); 2373 { 2374 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2375 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2376 if (result != NULL) { 2377 return result; 2378 } 2379 } 2380 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2381 return NULL; 2382 } else { 2383 // Lookup failed but need to search dex_caches_. 2384 mirror::Class* result = LookupClassFromImage(descriptor); 2385 if (result != NULL) { 2386 InsertClass(descriptor, result, hash); 2387 } else { 2388 // Searching the image dex files/caches failed, we don't want to get into this situation 2389 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2390 // classes into the class table. 2391 const int32_t kMaxFailedDexCacheLookups = 1000; 2392 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2393 MoveImageClassesToClassTable(); 2394 } 2395 } 2396 return result; 2397 } 2398} 2399 2400mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2401 const mirror::ClassLoader* class_loader, 2402 size_t hash) { 2403 auto end = class_table_.end(); 2404 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2405 mirror::Class** root = &it->second; 2406 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2407 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2408 if (kIsDebugBuild) { 2409 // Check for duplicates in the table. 2410 for (++it; it != end && it->first == hash; ++it) { 2411 mirror::Class** root2 = &it->second; 2412 mirror::Class* klass2 = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root2); 2413 CHECK(!(klass2->GetClassLoader() == class_loader && 2414 klass2->DescriptorEquals(descriptor))) 2415 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2416 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2417 } 2418 } 2419 return klass; 2420 } 2421 } 2422 return NULL; 2423} 2424 2425static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2426 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2427 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2428 CHECK(image != NULL); 2429 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2430 return root->AsObjectArray<mirror::DexCache>(); 2431} 2432 2433void ClassLinker::MoveImageClassesToClassTable() { 2434 Thread* self = Thread::Current(); 2435 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2436 if (!dex_cache_image_class_lookup_required_) { 2437 return; // All dex cache classes are already in the class table. 2438 } 2439 const char* old_no_suspend_cause = 2440 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2441 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2442 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2443 mirror::DexCache* dex_cache = dex_caches->Get(i); 2444 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2445 for (int32_t j = 0; j < types->GetLength(); j++) { 2446 mirror::Class* klass = types->Get(j); 2447 if (klass != NULL) { 2448 DCHECK(klass->GetClassLoader() == NULL); 2449 std::string descriptor = klass->GetDescriptor(); 2450 size_t hash = Hash(descriptor.c_str()); 2451 mirror::Class* existing = LookupClassFromTableLocked(descriptor.c_str(), NULL, hash); 2452 if (existing != NULL) { 2453 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2454 << PrettyClassAndClassLoader(klass); 2455 } else { 2456 class_table_.insert(std::make_pair(hash, klass)); 2457 if (log_new_class_table_roots_) { 2458 new_class_roots_.push_back(std::make_pair(hash, klass)); 2459 } 2460 } 2461 } 2462 } 2463 } 2464 dex_cache_image_class_lookup_required_ = false; 2465 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2466} 2467 2468mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2469 Thread* self = Thread::Current(); 2470 const char* old_no_suspend_cause = 2471 self->StartAssertNoThreadSuspension("Image class lookup"); 2472 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2473 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2474 mirror::DexCache* dex_cache = dex_caches->Get(i); 2475 const DexFile* dex_file = dex_cache->GetDexFile(); 2476 // Try binary searching the string/type index. 2477 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2478 if (string_id != NULL) { 2479 const DexFile::TypeId* type_id = 2480 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2481 if (type_id != NULL) { 2482 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2483 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2484 if (klass != NULL) { 2485 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2486 return klass; 2487 } 2488 } 2489 } 2490 } 2491 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2492 return NULL; 2493} 2494 2495void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2496 result.clear(); 2497 if (dex_cache_image_class_lookup_required_) { 2498 MoveImageClassesToClassTable(); 2499 } 2500 size_t hash = Hash(descriptor); 2501 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2502 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2503 it != end && it->first == hash; ++it) { 2504 mirror::Class** root = &it->second; 2505 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2506 if (klass->DescriptorEquals(descriptor)) { 2507 result.push_back(klass); 2508 } 2509 } 2510} 2511 2512void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 2513 // TODO: assert that the monitor on the Class is held 2514 Thread* self = Thread::Current(); 2515 ObjectLock<mirror::Class> lock(self, klass); 2516 2517 // Don't attempt to re-verify if already sufficiently verified. 2518 if (klass->IsVerified() || 2519 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2520 return; 2521 } 2522 2523 // The class might already be erroneous, for example at compile time if we attempted to verify 2524 // this class as a parent to another. 2525 if (klass->IsErroneous()) { 2526 ThrowEarlierClassFailure(klass.Get()); 2527 return; 2528 } 2529 2530 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2531 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2532 } else { 2533 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2534 << PrettyClass(klass.Get()); 2535 CHECK(!Runtime::Current()->IsCompiler()); 2536 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2537 } 2538 2539 // Skip verification if disabled. 2540 if (!Runtime::Current()->IsVerificationEnabled()) { 2541 klass->SetStatus(mirror::Class::kStatusVerified, self); 2542 return; 2543 } 2544 2545 // Verify super class. 2546 StackHandleScope<2> hs(self); 2547 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 2548 if (super.Get() != NULL) { 2549 // Acquire lock to prevent races on verifying the super class. 2550 ObjectLock<mirror::Class> lock(self, super); 2551 2552 if (!super->IsVerified() && !super->IsErroneous()) { 2553 VerifyClass(super); 2554 } 2555 if (!super->IsCompileTimeVerified()) { 2556 std::string error_msg( 2557 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2558 PrettyDescriptor(klass.Get()).c_str(), 2559 PrettyDescriptor(super.Get()).c_str())); 2560 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2561 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 2562 if (cause.Get() != nullptr) { 2563 self->ClearException(); 2564 } 2565 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2566 if (cause.Get() != nullptr) { 2567 self->GetException(nullptr)->SetCause(cause.Get()); 2568 } 2569 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2570 if (Runtime::Current()->IsCompiler()) { 2571 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2572 } 2573 klass->SetStatus(mirror::Class::kStatusError, self); 2574 return; 2575 } 2576 } 2577 2578 // Try to use verification information from the oat file, otherwise do runtime verification. 2579 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2580 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2581 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 2582 if (oat_file_class_status == mirror::Class::kStatusError) { 2583 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2584 << PrettyDescriptor(klass.Get()) << " in " 2585 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2586 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 2587 PrettyDescriptor(klass.Get()).c_str()); 2588 klass->SetStatus(mirror::Class::kStatusError, self); 2589 return; 2590 } 2591 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2592 std::string error_msg; 2593 if (!preverified) { 2594 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 2595 Runtime::Current()->IsCompiler(), 2596 &error_msg); 2597 } 2598 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2599 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2600 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 2601 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2602 << " because: " << error_msg; 2603 } 2604 self->AssertNoPendingException(); 2605 // Make sure all classes referenced by catch blocks are resolved. 2606 ResolveClassExceptionHandlerTypes(dex_file, klass); 2607 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2608 // Even though there were no verifier failures we need to respect whether the super-class 2609 // was verified or requiring runtime reverification. 2610 if (super.Get() == NULL || super->IsVerified()) { 2611 klass->SetStatus(mirror::Class::kStatusVerified, self); 2612 } else { 2613 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2614 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2615 // Pretend a soft failure occured so that we don't consider the class verified below. 2616 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2617 } 2618 } else { 2619 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2620 // Soft failures at compile time should be retried at runtime. Soft 2621 // failures at runtime will be handled by slow paths in the generated 2622 // code. Set status accordingly. 2623 if (Runtime::Current()->IsCompiler()) { 2624 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2625 } else { 2626 klass->SetStatus(mirror::Class::kStatusVerified, self); 2627 } 2628 } 2629 } else { 2630 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 2631 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2632 << " because: " << error_msg; 2633 self->AssertNoPendingException(); 2634 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2635 klass->SetStatus(mirror::Class::kStatusError, self); 2636 } 2637 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2638 // Class is verified so we don't need to do any access check on its methods. 2639 // Let the interpreter know it by setting the kAccPreverified flag onto each 2640 // method. 2641 // Note: we're going here during compilation and at runtime. When we set the 2642 // kAccPreverified flag when compiling image classes, the flag is recorded 2643 // in the image and is set when loading the image. 2644 klass->SetPreverifiedFlagOnAllMethods(); 2645 } 2646} 2647 2648bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2649 mirror::Class::Status& oat_file_class_status) { 2650 // If we're compiling, we can only verify the class using the oat file if 2651 // we are not compiling the image or if the class we're verifying is not part of 2652 // the app. In other words, we will only check for preverification of bootclasspath 2653 // classes. 2654 if (Runtime::Current()->IsCompiler()) { 2655 // Are we compiling the bootclasspath? 2656 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2657 return false; 2658 } 2659 // We are compiling an app (not the image). 2660 2661 // Is this an app class? (I.e. not a bootclasspath class) 2662 if (klass->GetClassLoader() != NULL) { 2663 return false; 2664 } 2665 } 2666 2667 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2668 // Make this work with gtests, which do not set up the image properly. 2669 // TODO: we should clean up gtests to set up the image path properly. 2670 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2671 return false; 2672 } 2673 2674 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2675 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2676 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2677 &dex_location_checksum); 2678 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2679 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2680 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 2681 if (oat_file_class_status == mirror::Class::kStatusVerified || 2682 oat_file_class_status == mirror::Class::kStatusInitialized) { 2683 return true; 2684 } 2685 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2686 // Compile time verification failed with a soft error. Compile time verification can fail 2687 // because we have incomplete type information. Consider the following: 2688 // class ... { 2689 // Foo x; 2690 // .... () { 2691 // if (...) { 2692 // v1 gets assigned a type of resolved class Foo 2693 // } else { 2694 // v1 gets assigned a type of unresolved class Bar 2695 // } 2696 // iput x = v1 2697 // } } 2698 // when we merge v1 following the if-the-else it results in Conflict 2699 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2700 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2701 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2702 // at compile time). 2703 return false; 2704 } 2705 if (oat_file_class_status == mirror::Class::kStatusError) { 2706 // Compile time verification failed with a hard error. This is caused by invalid instructions 2707 // in the class. These errors are unrecoverable. 2708 return false; 2709 } 2710 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2711 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2712 // not loading the class. 2713 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2714 // isn't a problem and this case shouldn't occur 2715 return false; 2716 } 2717 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2718 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2719 << klass->GetDescriptor(); 2720 2721 return false; 2722} 2723 2724void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2725 Handle<mirror::Class> klass) { 2726 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2727 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2728 } 2729 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2730 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2731 } 2732} 2733 2734void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2735 mirror::ArtMethod* method) { 2736 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2737 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2738 if (code_item == NULL) { 2739 return; // native or abstract method 2740 } 2741 if (code_item->tries_size_ == 0) { 2742 return; // nothing to process 2743 } 2744 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2745 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2746 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2747 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2748 CatchHandlerIterator iterator(handlers_ptr); 2749 for (; iterator.HasNext(); iterator.Next()) { 2750 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2751 // unresolved exception types will be ignored by exception delivery 2752 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2753 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2754 if (exception_type == NULL) { 2755 DCHECK(Thread::Current()->IsExceptionPending()); 2756 Thread::Current()->ClearException(); 2757 } 2758 } 2759 } 2760 handlers_ptr = iterator.EndDataPointer(); 2761 } 2762} 2763 2764static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2765static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 2766 Handle<mirror::ArtMethod> prototype); 2767 2768mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 2769 jobjectArray interfaces, jobject loader, 2770 jobjectArray methods, jobjectArray throws) { 2771 Thread* self = soa.Self(); 2772 StackHandleScope<8> hs(self); 2773 Handle<mirror::Class> klass(hs.NewHandle(AllocClass(self, GetClassRoot(kJavaLangClass), 2774 sizeof(mirror::SynthesizedProxyClass)))); 2775 if (klass.Get() == NULL) { 2776 CHECK(self->IsExceptionPending()); // OOME. 2777 return NULL; 2778 } 2779 DCHECK(klass->GetClass() != NULL); 2780 klass->SetObjectSize(sizeof(mirror::Proxy)); 2781 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2782 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2783 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2784 klass->SetName(soa.Decode<mirror::String*>(name)); 2785 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2786 klass->SetDexCache(proxy_class->GetDexCache()); 2787 klass->SetStatus(mirror::Class::kStatusIdx, self); 2788 2789 // Instance fields are inherited, but we add a couple of static fields... 2790 { 2791 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2792 if (UNLIKELY(sfields == NULL)) { 2793 CHECK(self->IsExceptionPending()); // OOME. 2794 return NULL; 2795 } 2796 klass->SetSFields(sfields); 2797 } 2798 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2799 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2800 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 2801 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 2802 CHECK(self->IsExceptionPending()); // OOME. 2803 return nullptr; 2804 } 2805 klass->SetStaticField(0, interfaces_sfield.Get()); 2806 interfaces_sfield->SetDexFieldIndex(0); 2807 interfaces_sfield->SetDeclaringClass(klass.Get()); 2808 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2809 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2810 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 2811 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 2812 CHECK(self->IsExceptionPending()); // OOME. 2813 return nullptr; 2814 } 2815 klass->SetStaticField(1, throws_sfield.Get()); 2816 throws_sfield->SetDexFieldIndex(1); 2817 throws_sfield->SetDeclaringClass(klass.Get()); 2818 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2819 2820 // Proxies have 1 direct method, the constructor 2821 { 2822 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 2823 if (UNLIKELY(directs == nullptr)) { 2824 CHECK(self->IsExceptionPending()); // OOME. 2825 return nullptr; 2826 } 2827 klass->SetDirectMethods(directs); 2828 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2829 if (UNLIKELY(constructor == nullptr)) { 2830 CHECK(self->IsExceptionPending()); // OOME. 2831 return nullptr; 2832 } 2833 klass->SetDirectMethod(0, constructor); 2834 } 2835 2836 // Create virtual method using specified prototypes. 2837 size_t num_virtual_methods = 2838 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 2839 { 2840 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 2841 num_virtual_methods); 2842 if (UNLIKELY(virtuals == NULL)) { 2843 CHECK(self->IsExceptionPending()); // OOME. 2844 return NULL; 2845 } 2846 klass->SetVirtualMethods(virtuals); 2847 } 2848 for (size_t i = 0; i < num_virtual_methods; ++i) { 2849 StackHandleScope<1> hs(self); 2850 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2851 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2852 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 2853 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2854 if (UNLIKELY(clone == nullptr)) { 2855 CHECK(self->IsExceptionPending()); // OOME. 2856 return nullptr; 2857 } 2858 klass->SetVirtualMethod(i, clone); 2859 } 2860 2861 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2862 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 2863 self->AssertNoPendingException(); 2864 2865 { 2866 ObjectLock<mirror::Class> lock(self, klass); // Must hold lock on object when resolved. 2867 // Link the fields and virtual methods, creating vtable and iftables 2868 Handle<mirror::ObjectArray<mirror::Class>> h_interfaces( 2869 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 2870 if (!LinkClass(self, klass, h_interfaces)) { 2871 klass->SetStatus(mirror::Class::kStatusError, self); 2872 return nullptr; 2873 } 2874 2875 interfaces_sfield->SetObject<false>( 2876 klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2877 throws_sfield->SetObject<false>( 2878 klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 2879 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2880 } 2881 2882 // sanity checks 2883 if (kIsDebugBuild) { 2884 CHECK(klass->GetIFields() == nullptr); 2885 CheckProxyConstructor(klass->GetDirectMethod(0)); 2886 for (size_t i = 0; i < num_virtual_methods; ++i) { 2887 StackHandleScope<2> hs(self); 2888 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2889 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2890 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 2891 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 2892 CheckProxyMethod(virtual_method, prototype); 2893 } 2894 2895 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 2896 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2897 decoded_name->ToModifiedUtf8().c_str())); 2898 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2899 2900 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2901 decoded_name->ToModifiedUtf8().c_str())); 2902 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2903 2904 mirror::SynthesizedProxyClass* synth_proxy_class = 2905 down_cast<mirror::SynthesizedProxyClass*>(klass.Get()); 2906 CHECK_EQ(synth_proxy_class->GetInterfaces(), 2907 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2908 CHECK_EQ(synth_proxy_class->GetThrows(), 2909 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 2910 } 2911 std::string descriptor(GetDescriptorForProxy(klass.Get())); 2912 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 2913 CHECK(existing == nullptr); 2914 return klass.Get(); 2915} 2916 2917std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 2918 DCHECK(proxy_class->IsProxyClass()); 2919 mirror::String* name = proxy_class->GetName(); 2920 DCHECK(name != NULL); 2921 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2922} 2923 2924mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 2925 mirror::ArtMethod* proxy_method) { 2926 DCHECK(proxy_class->IsProxyClass()); 2927 DCHECK(proxy_method->IsProxyMethod()); 2928 // Locate the dex cache of the original interface/Object 2929 mirror::DexCache* dex_cache = NULL; 2930 { 2931 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2932 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2933 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2934 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2935 dex_cache = dex_caches_[i]; 2936 break; 2937 } 2938 } 2939 } 2940 CHECK(dex_cache != NULL); 2941 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2942 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2943 CHECK(resolved_method != NULL); 2944 return resolved_method; 2945} 2946 2947 2948mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2949 Handle<mirror::Class> klass, 2950 mirror::Class* proxy_class) { 2951 // Create constructor for Proxy that must initialize h 2952 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2953 proxy_class->GetDirectMethods(); 2954 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2955 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2956 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2957 // code_ too) 2958 mirror::ArtMethod* constructor = 2959 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2960 if (constructor == NULL) { 2961 CHECK(self->IsExceptionPending()); // OOME. 2962 return NULL; 2963 } 2964 // Make this constructor public and fix the class to be our Proxy version 2965 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2966 constructor->SetDeclaringClass(klass.Get()); 2967 return constructor; 2968} 2969 2970static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2971 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2972 CHECK(constructor->IsConstructor()); 2973 CHECK_STREQ(constructor->GetName(), "<init>"); 2974 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 2975 "(Ljava/lang/reflect/InvocationHandler;)V"); 2976 DCHECK(constructor->IsPublic()); 2977} 2978 2979mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 2980 Handle<mirror::Class> klass, 2981 Handle<mirror::ArtMethod> prototype) { 2982 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2983 // prototype method 2984 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2985 prototype.Get()); 2986 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2987 // as necessary 2988 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 2989 if (UNLIKELY(method == NULL)) { 2990 CHECK(self->IsExceptionPending()); // OOME. 2991 return NULL; 2992 } 2993 2994 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 2995 // the intersection of throw exceptions as defined in Proxy 2996 method->SetDeclaringClass(klass.Get()); 2997 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 2998 2999 // At runtime the method looks like a reference and argument saving method, clone the code 3000 // related parameters from this method. 3001 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3002 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3003 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3004 3005 return method; 3006} 3007 3008static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3009 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3010 // Basic sanity 3011 CHECK(!prototype->IsFinal()); 3012 CHECK(method->IsFinal()); 3013 CHECK(!method->IsAbstract()); 3014 3015 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3016 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3017 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3018 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 3019 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 3020 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3021 3022 MethodHelper mh(method); 3023 MethodHelper mh2(prototype); 3024 CHECK_STREQ(method->GetName(), prototype->GetName()); 3025 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3026 // More complex sanity - via dex cache 3027 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3028} 3029 3030static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3031 bool can_init_parents) 3032 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3033 if (can_init_statics && can_init_parents) { 3034 return true; 3035 } 3036 if (!can_init_statics) { 3037 // Check if there's a class initializer. 3038 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3039 if (clinit != NULL) { 3040 return false; 3041 } 3042 // Check if there are encoded static values needing initialization. 3043 if (klass->NumStaticFields() != 0) { 3044 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3045 DCHECK(dex_class_def != NULL); 3046 if (dex_class_def->static_values_off_ != 0) { 3047 return false; 3048 } 3049 } 3050 } 3051 if (!klass->IsInterface() && klass->HasSuperClass()) { 3052 mirror::Class* super_class = klass->GetSuperClass(); 3053 if (!can_init_parents && !super_class->IsInitialized()) { 3054 return false; 3055 } else { 3056 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3057 return false; 3058 } 3059 } 3060 } 3061 return true; 3062} 3063 3064bool ClassLinker::IsInitialized() const { 3065 return init_done_; 3066} 3067 3068bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3069 bool can_init_parents) { 3070 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3071 3072 // Are we already initialized and therefore done? 3073 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3074 // an initialized class will never change its state. 3075 if (klass->IsInitialized()) { 3076 return true; 3077 } 3078 3079 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3080 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3081 return false; 3082 } 3083 3084 Thread* self = Thread::Current(); 3085 uint64_t t0; 3086 { 3087 ObjectLock<mirror::Class> lock(self, klass); 3088 3089 // Re-check under the lock in case another thread initialized ahead of us. 3090 if (klass->IsInitialized()) { 3091 return true; 3092 } 3093 3094 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3095 if (klass->IsErroneous()) { 3096 ThrowEarlierClassFailure(klass.Get()); 3097 return false; 3098 } 3099 3100 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3101 3102 if (!klass->IsVerified()) { 3103 VerifyClass(klass); 3104 if (!klass->IsVerified()) { 3105 // We failed to verify, expect either the klass to be erroneous or verification failed at 3106 // compile time. 3107 if (klass->IsErroneous()) { 3108 CHECK(self->IsExceptionPending()); 3109 } else { 3110 CHECK(Runtime::Current()->IsCompiler()); 3111 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3112 } 3113 return false; 3114 } 3115 } 3116 3117 // If the class is kStatusInitializing, either this thread is 3118 // initializing higher up the stack or another thread has beat us 3119 // to initializing and we need to wait. Either way, this 3120 // invocation of InitializeClass will not be responsible for 3121 // running <clinit> and will return. 3122 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3123 // We caught somebody else in the act; was it us? 3124 if (klass->GetClinitThreadId() == self->GetTid()) { 3125 // Yes. That's fine. Return so we can continue initializing. 3126 return true; 3127 } 3128 // No. That's fine. Wait for another thread to finish initializing. 3129 return WaitForInitializeClass(klass, self, lock); 3130 } 3131 3132 if (!ValidateSuperClassDescriptors(klass)) { 3133 klass->SetStatus(mirror::Class::kStatusError, self); 3134 return false; 3135 } 3136 3137 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3138 3139 // From here out other threads may observe that we're initializing and so changes of state 3140 // require the a notification. 3141 klass->SetClinitThreadId(self->GetTid()); 3142 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3143 3144 t0 = NanoTime(); 3145 } 3146 3147 // Initialize super classes, must be done while initializing for the JLS. 3148 if (!klass->IsInterface() && klass->HasSuperClass()) { 3149 mirror::Class* super_class = klass->GetSuperClass(); 3150 if (!super_class->IsInitialized()) { 3151 CHECK(!super_class->IsInterface()); 3152 CHECK(can_init_parents); 3153 StackHandleScope<1> hs(self); 3154 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3155 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3156 if (!super_initialized) { 3157 // The super class was verified ahead of entering initializing, we should only be here if 3158 // the super class became erroneous due to initialization. 3159 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3160 << "Super class initialization failed for " 3161 << PrettyDescriptor(handle_scope_super.Get()) 3162 << " that has unexpected status " << handle_scope_super->GetStatus() 3163 << "\nPending exception:\n" 3164 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3165 ObjectLock<mirror::Class> lock(self, klass); 3166 // Initialization failed because the super-class is erroneous. 3167 klass->SetStatus(mirror::Class::kStatusError, self); 3168 return false; 3169 } 3170 } 3171 } 3172 3173 if (klass->NumStaticFields() > 0) { 3174 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3175 CHECK(dex_class_def != NULL); 3176 const DexFile& dex_file = klass->GetDexFile(); 3177 StackHandleScope<2> hs(self); 3178 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3179 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3180 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3181 this, *dex_class_def); 3182 if (it.HasNext()) { 3183 CHECK(can_init_statics); 3184 // We reordered the fields, so we need to be able to map the 3185 // field indexes to the right fields. 3186 SafeMap<uint32_t, mirror::ArtField*> field_map; 3187 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3188 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3189 if (Runtime::Current()->IsActiveTransaction()) { 3190 it.ReadValueToField<true>(field_map.Get(i)); 3191 } else { 3192 it.ReadValueToField<false>(field_map.Get(i)); 3193 } 3194 } 3195 } 3196 } 3197 3198 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3199 if (clinit != NULL) { 3200 CHECK(can_init_statics); 3201 JValue result; 3202 clinit->Invoke(self, NULL, 0, &result, "V"); 3203 } 3204 3205 uint64_t t1 = NanoTime(); 3206 3207 bool success = true; 3208 { 3209 ObjectLock<mirror::Class> lock(self, klass); 3210 3211 if (self->IsExceptionPending()) { 3212 WrapExceptionInInitializer(); 3213 klass->SetStatus(mirror::Class::kStatusError, self); 3214 success = false; 3215 } else { 3216 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3217 RuntimeStats* thread_stats = self->GetStats(); 3218 ++global_stats->class_init_count; 3219 ++thread_stats->class_init_count; 3220 global_stats->class_init_time_ns += (t1 - t0); 3221 thread_stats->class_init_time_ns += (t1 - t0); 3222 // Set the class as initialized except if failed to initialize static fields. 3223 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3224 if (VLOG_IS_ON(class_linker)) { 3225 LOG(INFO) << "Initialized class " << klass->GetDescriptor() << " from " << 3226 klass->GetLocation(); 3227 } 3228 // Opportunistically set static method trampolines to their destination. 3229 FixupStaticTrampolines(klass.Get()); 3230 } 3231 } 3232 return success; 3233} 3234 3235bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3236 ObjectLock<mirror::Class>& lock) 3237 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3238 while (true) { 3239 self->AssertNoPendingException(); 3240 CHECK(!klass->IsInitialized()); 3241 lock.WaitIgnoringInterrupts(); 3242 3243 // When we wake up, repeat the test for init-in-progress. If 3244 // there's an exception pending (only possible if 3245 // "interruptShouldThrow" was set), bail out. 3246 if (self->IsExceptionPending()) { 3247 WrapExceptionInInitializer(); 3248 klass->SetStatus(mirror::Class::kStatusError, self); 3249 return false; 3250 } 3251 // Spurious wakeup? Go back to waiting. 3252 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3253 continue; 3254 } 3255 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3256 // Compile time initialization failed. 3257 return false; 3258 } 3259 if (klass->IsErroneous()) { 3260 // The caller wants an exception, but it was thrown in a 3261 // different thread. Synthesize one here. 3262 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3263 PrettyDescriptor(klass.Get()).c_str()); 3264 return false; 3265 } 3266 if (klass->IsInitialized()) { 3267 return true; 3268 } 3269 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 3270 << klass->GetStatus(); 3271 } 3272 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 3273} 3274 3275bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 3276 if (klass->IsInterface()) { 3277 return true; 3278 } 3279 // Begin with the methods local to the superclass. 3280 StackHandleScope<2> hs(Thread::Current()); 3281 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3282 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3283 if (klass->HasSuperClass() && 3284 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3285 for (int i = klass->GetSuperClass()->GetVTable()->GetLength() - 1; i >= 0; --i) { 3286 mh.ChangeMethod(klass->GetVTable()->GetWithoutChecks(i)); 3287 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTable()->GetWithoutChecks(i)); 3288 if (mh.GetMethod() != super_mh.GetMethod() && 3289 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3290 ThrowLinkageError(klass.Get(), 3291 "Class %s method %s resolves differently in superclass %s", 3292 PrettyDescriptor(klass.Get()).c_str(), 3293 PrettyMethod(mh.GetMethod()).c_str(), 3294 PrettyDescriptor(klass->GetSuperClass()).c_str()); 3295 return false; 3296 } 3297 } 3298 } 3299 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3300 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 3301 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 3302 for (uint32_t j = 0; j < num_methods; ++j) { 3303 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 3304 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 3305 if (mh.GetMethod() != super_mh.GetMethod() && 3306 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3307 ThrowLinkageError(klass.Get(), 3308 "Class %s method %s resolves differently in interface %s", 3309 PrettyDescriptor(klass.Get()).c_str(), 3310 PrettyMethod(mh.GetMethod()).c_str(), 3311 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 3312 return false; 3313 } 3314 } 3315 } 3316 } 3317 return true; 3318} 3319 3320bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 3321 bool can_init_parents) { 3322 DCHECK(c.Get() != nullptr); 3323 const bool success = c->IsInitialized() || InitializeClass(c, can_init_fields, can_init_parents); 3324 if (!success && can_init_fields && can_init_parents) { 3325 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.Get()); 3326 } 3327 return success; 3328} 3329 3330void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3331 mirror::Class* c, 3332 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3333 const byte* class_data = dex_file.GetClassData(dex_class_def); 3334 ClassDataItemIterator it(dex_file, class_data); 3335 StackHandleScope<2> hs(Thread::Current()); 3336 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 3337 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 3338 CHECK(!kMovingFields); 3339 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3340 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3341 } 3342} 3343 3344bool ClassLinker::LinkClass(Thread* self, Handle<mirror::Class> klass, 3345 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3346 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3347 if (!LinkSuperClass(klass)) { 3348 return false; 3349 } 3350 if (!LinkMethods(self, klass, interfaces)) { 3351 return false; 3352 } 3353 if (!LinkInstanceFields(klass)) { 3354 return false; 3355 } 3356 if (!LinkStaticFields(klass)) { 3357 return false; 3358 } 3359 CreateReferenceInstanceOffsets(klass); 3360 CreateReferenceStaticOffsets(klass); 3361 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3362 klass->SetStatus(mirror::Class::kStatusResolved, self); 3363 return true; 3364} 3365 3366bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 3367 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3368 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3369 uint16_t super_class_idx = class_def.superclass_idx_; 3370 if (super_class_idx != DexFile::kDexNoIndex16) { 3371 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 3372 if (super_class == NULL) { 3373 DCHECK(Thread::Current()->IsExceptionPending()); 3374 return false; 3375 } 3376 // Verify 3377 if (!klass->CanAccess(super_class)) { 3378 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 3379 PrettyDescriptor(super_class).c_str(), 3380 PrettyDescriptor(klass.Get()).c_str()); 3381 return false; 3382 } 3383 klass->SetSuperClass(super_class); 3384 } 3385 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3386 if (interfaces != NULL) { 3387 for (size_t i = 0; i < interfaces->Size(); i++) { 3388 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3389 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 3390 if (interface == NULL) { 3391 DCHECK(Thread::Current()->IsExceptionPending()); 3392 return false; 3393 } 3394 // Verify 3395 if (!klass->CanAccess(interface)) { 3396 // TODO: the RI seemed to ignore this in my testing. 3397 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 3398 PrettyDescriptor(interface).c_str(), 3399 PrettyDescriptor(klass.Get()).c_str()); 3400 return false; 3401 } 3402 } 3403 } 3404 // Mark the class as loaded. 3405 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3406 return true; 3407} 3408 3409bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 3410 CHECK(!klass->IsPrimitive()); 3411 mirror::Class* super = klass->GetSuperClass(); 3412 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 3413 if (super != NULL) { 3414 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 3415 return false; 3416 } 3417 return true; 3418 } 3419 if (super == NULL) { 3420 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 3421 PrettyDescriptor(klass.Get()).c_str()); 3422 return false; 3423 } 3424 // Verify 3425 if (super->IsFinal() || super->IsInterface()) { 3426 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 3427 PrettyDescriptor(super).c_str(), 3428 PrettyDescriptor(klass.Get()).c_str(), 3429 super->IsFinal() ? "declared final" : "an interface"); 3430 return false; 3431 } 3432 if (!klass->CanAccess(super)) { 3433 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 3434 PrettyDescriptor(super).c_str(), 3435 PrettyDescriptor(klass.Get()).c_str()); 3436 return false; 3437 } 3438 3439 // Inherit kAccClassIsFinalizable from the superclass in case this 3440 // class doesn't override finalize. 3441 if (super->IsFinalizable()) { 3442 klass->SetFinalizable(); 3443 } 3444 3445 // Inherit reference flags (if any) from the superclass. 3446 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3447 if (reference_flags != 0) { 3448 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3449 } 3450 // Disallow custom direct subclasses of java.lang.ref.Reference. 3451 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3452 ThrowLinkageError(klass.Get(), 3453 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3454 PrettyDescriptor(klass.Get()).c_str()); 3455 return false; 3456 } 3457 3458 if (kIsDebugBuild) { 3459 // Ensure super classes are fully resolved prior to resolving fields.. 3460 while (super != NULL) { 3461 CHECK(super->IsResolved()); 3462 super = super->GetSuperClass(); 3463 } 3464 } 3465 return true; 3466} 3467 3468// Populate the class vtable and itable. Compute return type indices. 3469bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 3470 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3471 if (klass->IsInterface()) { 3472 // No vtable. 3473 size_t count = klass->NumVirtualMethods(); 3474 if (!IsUint(16, count)) { 3475 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 3476 return false; 3477 } 3478 for (size_t i = 0; i < count; ++i) { 3479 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3480 } 3481 // Link interface method tables 3482 return LinkInterfaceMethods(klass, interfaces); 3483 } else { 3484 // Link virtual and interface method tables 3485 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 3486 } 3487 return true; 3488} 3489 3490bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 3491 if (klass->HasSuperClass()) { 3492 uint32_t max_count = klass->NumVirtualMethods() + 3493 klass->GetSuperClass()->GetVTable()->GetLength(); 3494 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3495 CHECK_LE(actual_count, max_count); 3496 // TODO: do not assign to the vtable field until it is fully constructed. 3497 StackHandleScope<3> hs(self); 3498 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3499 hs.NewHandle(klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count))); 3500 if (UNLIKELY(vtable.Get() == NULL)) { 3501 CHECK(self->IsExceptionPending()); // OOME. 3502 return false; 3503 } 3504 // See if any of our virtual methods override the superclass. 3505 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3506 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3507 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3508 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3509 local_mh.ChangeMethod(local_method); 3510 size_t j = 0; 3511 for (; j < actual_count; ++j) { 3512 mirror::ArtMethod* super_method = vtable->Get(j); 3513 super_mh.ChangeMethod(super_method); 3514 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3515 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 3516 super_method->GetAccessFlags())) { 3517 if (super_method->IsFinal()) { 3518 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 3519 PrettyMethod(local_method).c_str(), 3520 super_method->GetDeclaringClassDescriptor()); 3521 return false; 3522 } 3523 vtable->Set<false>(j, local_method); 3524 local_method->SetMethodIndex(j); 3525 break; 3526 } else { 3527 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3528 << " would have incorrectly overridden the package-private method in " 3529 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 3530 } 3531 } 3532 } 3533 if (j == actual_count) { 3534 // Not overriding, append. 3535 vtable->Set<false>(actual_count, local_method); 3536 local_method->SetMethodIndex(actual_count); 3537 actual_count += 1; 3538 } 3539 } 3540 if (!IsUint(16, actual_count)) { 3541 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 3542 return false; 3543 } 3544 // Shrink vtable if possible 3545 CHECK_LE(actual_count, max_count); 3546 if (actual_count < max_count) { 3547 vtable.Assign(vtable->CopyOf(self, actual_count)); 3548 if (UNLIKELY(vtable.Get() == NULL)) { 3549 CHECK(self->IsExceptionPending()); // OOME. 3550 return false; 3551 } 3552 } 3553 klass->SetVTable(vtable.Get()); 3554 } else { 3555 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 3556 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3557 if (!IsUint(16, num_virtual_methods)) { 3558 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 3559 return false; 3560 } 3561 StackHandleScope<1> hs(self); 3562 Handle<mirror::ObjectArray<mirror::ArtMethod>> 3563 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 3564 if (UNLIKELY(vtable.Get() == NULL)) { 3565 CHECK(self->IsExceptionPending()); // OOME. 3566 return false; 3567 } 3568 for (size_t i = 0; i < num_virtual_methods; ++i) { 3569 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3570 vtable->Set<false>(i, virtual_method); 3571 virtual_method->SetMethodIndex(i & 0xFFFF); 3572 } 3573 klass->SetVTable(vtable.Get()); 3574 } 3575 return true; 3576} 3577 3578bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 3579 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3580 Thread* const self = Thread::Current(); 3581 Runtime* const runtime = Runtime::Current(); 3582 // Set the imt table to be all conflicts by default. 3583 klass->SetImTable(runtime->GetDefaultImt()); 3584 size_t super_ifcount; 3585 if (klass->HasSuperClass()) { 3586 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3587 } else { 3588 super_ifcount = 0; 3589 } 3590 uint32_t num_interfaces = 3591 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 3592 size_t ifcount = super_ifcount + num_interfaces; 3593 for (size_t i = 0; i < num_interfaces; i++) { 3594 mirror::Class* interface = 3595 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 3596 interfaces->Get(i); 3597 ifcount += interface->GetIfTableCount(); 3598 } 3599 if (ifcount == 0) { 3600 // Class implements no interfaces. 3601 DCHECK_EQ(klass->GetIfTableCount(), 0); 3602 DCHECK(klass->GetIfTable() == NULL); 3603 return true; 3604 } 3605 if (ifcount == super_ifcount) { 3606 // Class implements same interfaces as parent, are any of these not marker interfaces? 3607 bool has_non_marker_interface = false; 3608 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3609 for (size_t i = 0; i < ifcount; ++i) { 3610 if (super_iftable->GetMethodArrayCount(i) > 0) { 3611 has_non_marker_interface = true; 3612 break; 3613 } 3614 } 3615 if (!has_non_marker_interface) { 3616 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3617 klass->SetIfTable(super_iftable); 3618 return true; 3619 } 3620 } 3621 StackHandleScope<4> hs(self); 3622 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 3623 if (UNLIKELY(iftable.Get() == NULL)) { 3624 CHECK(self->IsExceptionPending()); // OOME. 3625 return false; 3626 } 3627 if (super_ifcount != 0) { 3628 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3629 for (size_t i = 0; i < super_ifcount; i++) { 3630 mirror::Class* super_interface = super_iftable->GetInterface(i); 3631 iftable->SetInterface(i, super_interface); 3632 } 3633 } 3634 // Flatten the interface inheritance hierarchy. 3635 size_t idx = super_ifcount; 3636 for (size_t i = 0; i < num_interfaces; i++) { 3637 mirror::Class* interface = 3638 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 3639 interfaces->Get(i); 3640 DCHECK(interface != NULL); 3641 if (!interface->IsInterface()) { 3642 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 3643 PrettyDescriptor(klass.Get()).c_str(), 3644 PrettyDescriptor(interface->GetDescriptor()).c_str()); 3645 return false; 3646 } 3647 // Check if interface is already in iftable 3648 bool duplicate = false; 3649 for (size_t j = 0; j < idx; j++) { 3650 mirror::Class* existing_interface = iftable->GetInterface(j); 3651 if (existing_interface == interface) { 3652 duplicate = true; 3653 break; 3654 } 3655 } 3656 if (!duplicate) { 3657 // Add this non-duplicate interface. 3658 iftable->SetInterface(idx++, interface); 3659 // Add this interface's non-duplicate super-interfaces. 3660 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3661 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3662 bool super_duplicate = false; 3663 for (size_t k = 0; k < idx; k++) { 3664 mirror::Class* existing_interface = iftable->GetInterface(k); 3665 if (existing_interface == super_interface) { 3666 super_duplicate = true; 3667 break; 3668 } 3669 } 3670 if (!super_duplicate) { 3671 iftable->SetInterface(idx++, super_interface); 3672 } 3673 } 3674 } 3675 } 3676 // Shrink iftable in case duplicates were found 3677 if (idx < ifcount) { 3678 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3679 if (UNLIKELY(iftable.Get() == NULL)) { 3680 CHECK(self->IsExceptionPending()); // OOME. 3681 return false; 3682 } 3683 ifcount = idx; 3684 } else { 3685 CHECK_EQ(idx, ifcount); 3686 } 3687 klass->SetIfTable(iftable.Get()); 3688 3689 // If we're an interface, we don't need the vtable pointers, so we're done. 3690 if (klass->IsInterface()) { 3691 return true; 3692 } 3693 // Allocate imtable 3694 bool imtable_changed = false; 3695 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 3696 hs.NewHandle(AllocArtMethodArray(self, kImtSize))); 3697 if (UNLIKELY(imtable.Get() == NULL)) { 3698 CHECK(self->IsExceptionPending()); // OOME. 3699 return false; 3700 } 3701 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3702 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3703 std::vector<mirror::ArtMethod*> miranda_list; 3704 for (size_t i = 0; i < ifcount; ++i) { 3705 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 3706 if (num_methods > 0) { 3707 StackHandleScope<2> hs(self); 3708 Handle<mirror::ObjectArray<mirror::ArtMethod>> 3709 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 3710 if (UNLIKELY(method_array.Get() == nullptr)) { 3711 CHECK(self->IsExceptionPending()); // OOME. 3712 return false; 3713 } 3714 iftable->SetMethodArray(i, method_array.Get()); 3715 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3716 hs.NewHandle(klass->GetVTableDuringLinking())); 3717 for (size_t j = 0; j < num_methods; ++j) { 3718 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 3719 interface_mh.ChangeMethod(interface_method); 3720 int32_t k; 3721 // For each method listed in the interface's method list, find the 3722 // matching method in our class's method list. We want to favor the 3723 // subclass over the superclass, which just requires walking 3724 // back from the end of the vtable. (This only matters if the 3725 // superclass defines a private method and this class redefines 3726 // it -- otherwise it would use the same vtable slot. In .dex files 3727 // those don't end up in the virtual method table, so it shouldn't 3728 // matter which direction we go. We walk it backward anyway.) 3729 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3730 mirror::ArtMethod* vtable_method = vtable->Get(k); 3731 vtable_mh.ChangeMethod(vtable_method); 3732 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3733 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3734 ThrowIllegalAccessError( 3735 klass.Get(), 3736 "Method '%s' implementing interface method '%s' is not public", 3737 PrettyMethod(vtable_method).c_str(), 3738 PrettyMethod(interface_method).c_str()); 3739 return false; 3740 } 3741 method_array->Set<false>(j, vtable_method); 3742 // Place method in imt if entry is empty, place conflict otherwise. 3743 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3744 if (imtable->Get(imt_index) == NULL) { 3745 imtable->Set<false>(imt_index, vtable_method); 3746 imtable_changed = true; 3747 } else { 3748 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 3749 } 3750 break; 3751 } 3752 } 3753 if (k < 0) { 3754 StackHandleScope<1> hs(self); 3755 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 3756 for (mirror::ArtMethod* mir_method : miranda_list) { 3757 vtable_mh.ChangeMethod(mir_method); 3758 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3759 miranda_method.Assign(mir_method); 3760 break; 3761 } 3762 } 3763 if (miranda_method.Get() == NULL) { 3764 // Point the interface table at a phantom slot. 3765 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3766 if (UNLIKELY(miranda_method.Get() == NULL)) { 3767 CHECK(self->IsExceptionPending()); // OOME. 3768 return false; 3769 } 3770 // TODO: If a methods move then the miranda_list may hold stale references. 3771 miranda_list.push_back(miranda_method.Get()); 3772 } 3773 method_array->Set<false>(j, miranda_method.Get()); 3774 } 3775 } 3776 } 3777 } 3778 if (imtable_changed) { 3779 // Fill in empty entries in interface method table with conflict. 3780 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 3781 for (size_t i = 0; i < kImtSize; i++) { 3782 if (imtable->Get(i) == NULL) { 3783 imtable->Set<false>(i, imt_conflict_method); 3784 } 3785 } 3786 klass->SetImTable(imtable.Get()); 3787 } 3788 if (!miranda_list.empty()) { 3789 int old_method_count = klass->NumVirtualMethods(); 3790 int new_method_count = old_method_count + miranda_list.size(); 3791 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3792 if (old_method_count == 0) { 3793 virtuals = AllocArtMethodArray(self, new_method_count); 3794 } else { 3795 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3796 } 3797 if (UNLIKELY(virtuals == NULL)) { 3798 CHECK(self->IsExceptionPending()); // OOME. 3799 return false; 3800 } 3801 klass->SetVirtualMethods(virtuals); 3802 3803 StackHandleScope<1> hs(self); 3804 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3805 hs.NewHandle(klass->GetVTableDuringLinking())); 3806 CHECK(vtable.Get() != NULL); 3807 int old_vtable_count = vtable->GetLength(); 3808 int new_vtable_count = old_vtable_count + miranda_list.size(); 3809 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 3810 if (UNLIKELY(vtable.Get() == NULL)) { 3811 CHECK(self->IsExceptionPending()); // OOME. 3812 return false; 3813 } 3814 for (size_t i = 0; i < miranda_list.size(); ++i) { 3815 mirror::ArtMethod* method = miranda_list[i]; 3816 // Leave the declaring class alone as type indices are relative to it 3817 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3818 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3819 klass->SetVirtualMethod(old_method_count + i, method); 3820 vtable->Set<false>(old_vtable_count + i, method); 3821 } 3822 // TODO: do not assign to the vtable field until it is fully constructed. 3823 klass->SetVTable(vtable.Get()); 3824 } 3825 3826 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3827 for (int i = 0; i < vtable->GetLength(); ++i) { 3828 CHECK(vtable->Get(i) != NULL); 3829 } 3830 3831// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3832 3833 return true; 3834} 3835 3836bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 3837 CHECK(klass.Get() != NULL); 3838 return LinkFields(klass, false); 3839} 3840 3841bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass) { 3842 CHECK(klass.Get() != NULL); 3843 size_t allocated_class_size = klass->GetClassSize(); 3844 bool success = LinkFields(klass, true); 3845 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3846 return success; 3847} 3848 3849struct LinkFieldsComparator { 3850 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3851 } 3852 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3853 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 3854 NO_THREAD_SAFETY_ANALYSIS { 3855 // First come reference fields, then 64-bit, and finally 32-bit 3856 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 3857 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 3858 if (type1 != type2) { 3859 bool is_primitive1 = type1 != Primitive::kPrimNot; 3860 bool is_primitive2 = type2 != Primitive::kPrimNot; 3861 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 3862 type1 == Primitive::kPrimDouble); 3863 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 3864 type2 == Primitive::kPrimDouble); 3865 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 3866 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 3867 if (order1 != order2) { 3868 return order1 < order2; 3869 } 3870 } 3871 // same basic group? then sort by string. 3872 return strcmp(field1->GetName(), field2->GetName()) < 0; 3873 } 3874}; 3875 3876bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static) { 3877 size_t num_fields = 3878 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3879 3880 mirror::ObjectArray<mirror::ArtField>* fields = 3881 is_static ? klass->GetSFields() : klass->GetIFields(); 3882 3883 // Initialize size and field_offset 3884 size_t size; 3885 MemberOffset field_offset(0); 3886 if (is_static) { 3887 size = klass->GetClassSize(); 3888 field_offset = mirror::Class::FieldsOffset(); 3889 } else { 3890 mirror::Class* super_class = klass->GetSuperClass(); 3891 if (super_class != NULL) { 3892 CHECK(super_class->IsResolved()) 3893 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 3894 field_offset = MemberOffset(super_class->GetObjectSize()); 3895 } 3896 size = field_offset.Uint32Value(); 3897 } 3898 3899 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 3900 3901 // we want a relatively stable order so that adding new fields 3902 // minimizes disruption of C++ version such as Class and Method. 3903 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3904 for (size_t i = 0; i < num_fields; i++) { 3905 mirror::ArtField* f = fields->Get(i); 3906 CHECK(f != NULL) << PrettyClass(klass.Get()); 3907 grouped_and_sorted_fields.push_back(f); 3908 } 3909 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 3910 LinkFieldsComparator()); 3911 3912 // References should be at the front. 3913 size_t current_field = 0; 3914 size_t num_reference_fields = 0; 3915 for (; current_field < num_fields; current_field++) { 3916 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3917 Primitive::Type type = field->GetTypeAsPrimitiveType(); 3918 bool isPrimitive = type != Primitive::kPrimNot; 3919 if (isPrimitive) { 3920 break; // past last reference, move on to the next phase 3921 } 3922 grouped_and_sorted_fields.pop_front(); 3923 num_reference_fields++; 3924 fields->Set<false>(current_field, field); 3925 field->SetOffset(field_offset); 3926 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3927 } 3928 3929 // Now we want to pack all of the double-wide fields together. If 3930 // we're not aligned, though, we want to shuffle one 32-bit field 3931 // into place. If we can't find one, we'll have to pad it. 3932 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3933 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3934 mirror::ArtField* field = grouped_and_sorted_fields[i]; 3935 Primitive::Type type = field->GetTypeAsPrimitiveType(); 3936 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 3937 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 3938 continue; 3939 } 3940 fields->Set<false>(current_field++, field); 3941 field->SetOffset(field_offset); 3942 // drop the consumed field 3943 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 3944 break; 3945 } 3946 // whether we found a 32-bit field for padding or not, we advance 3947 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3948 } 3949 3950 // Alignment is good, shuffle any double-wide fields forward, and 3951 // finish assigning field offsets to all fields. 3952 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 3953 << PrettyClass(klass.Get()); 3954 while (!grouped_and_sorted_fields.empty()) { 3955 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3956 grouped_and_sorted_fields.pop_front(); 3957 Primitive::Type type = field->GetTypeAsPrimitiveType(); 3958 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 3959 fields->Set<false>(current_field, field); 3960 field->SetOffset(field_offset); 3961 field_offset = MemberOffset(field_offset.Uint32Value() + 3962 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 3963 ? sizeof(uint64_t) 3964 : sizeof(uint32_t))); 3965 current_field++; 3966 } 3967 3968 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 3969 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 3970 // We know there are no non-reference fields in the Reference classes, and we know 3971 // that 'referent' is alphabetically last, so this is easy... 3972 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 3973 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 3974 --num_reference_fields; 3975 } 3976 3977 if (kIsDebugBuild) { 3978 // Make sure that all reference fields appear before 3979 // non-reference fields, and all double-wide fields are aligned. 3980 bool seen_non_ref = false; 3981 for (size_t i = 0; i < num_fields; i++) { 3982 mirror::ArtField* field = fields->Get(i); 3983 if (false) { // enable to debug field layout 3984 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 3985 << " class=" << PrettyClass(klass.Get()) 3986 << " field=" << PrettyField(field) 3987 << " offset=" 3988 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 3989 } 3990 Primitive::Type type = field->GetTypeAsPrimitiveType(); 3991 bool is_primitive = type != Primitive::kPrimNot; 3992 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 3993 strcmp("referent", field->GetName()) == 0) { 3994 is_primitive = true; // We lied above, so we have to expect a lie here. 3995 } 3996 if (is_primitive) { 3997 if (!seen_non_ref) { 3998 seen_non_ref = true; 3999 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4000 } 4001 } else { 4002 DCHECK(!seen_non_ref) << PrettyField(field); 4003 } 4004 } 4005 if (!seen_non_ref) { 4006 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4007 } 4008 } 4009 size = field_offset.Uint32Value(); 4010 // Update klass 4011 if (is_static) { 4012 klass->SetNumReferenceStaticFields(num_reference_fields); 4013 klass->SetClassSize(size); 4014 } else { 4015 klass->SetNumReferenceInstanceFields(num_reference_fields); 4016 if (!klass->IsVariableSize()) { 4017 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(); 4018 size_t previous_size = klass->GetObjectSize(); 4019 if (previous_size != 0) { 4020 // Make sure that we didn't originally have an incorrect size. 4021 CHECK_EQ(previous_size, size) << klass->GetDescriptor(); 4022 } 4023 klass->SetObjectSize(size); 4024 } 4025 } 4026 return true; 4027} 4028 4029// Set the bitmap of reference offsets, refOffsets, from the ifields 4030// list. 4031void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4032 uint32_t reference_offsets = 0; 4033 mirror::Class* super_class = klass->GetSuperClass(); 4034 if (super_class != NULL) { 4035 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4036 // If our superclass overflowed, we don't stand a chance. 4037 if (reference_offsets == CLASS_WALK_SUPER) { 4038 klass->SetReferenceInstanceOffsets(reference_offsets); 4039 return; 4040 } 4041 } 4042 CreateReferenceOffsets(klass, false, reference_offsets); 4043} 4044 4045void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4046 CreateReferenceOffsets(klass, true, 0); 4047} 4048 4049void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4050 uint32_t reference_offsets) { 4051 size_t num_reference_fields = 4052 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4053 : klass->NumReferenceInstanceFieldsDuringLinking(); 4054 mirror::ObjectArray<mirror::ArtField>* fields = 4055 is_static ? klass->GetSFields() : klass->GetIFields(); 4056 // All of the fields that contain object references are guaranteed 4057 // to be at the beginning of the fields list. 4058 for (size_t i = 0; i < num_reference_fields; ++i) { 4059 // Note that byte_offset is the offset from the beginning of 4060 // object, not the offset into instance data 4061 mirror::ArtField* field = fields->Get(i); 4062 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4063 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4064 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4065 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4066 CHECK_NE(new_bit, 0U); 4067 reference_offsets |= new_bit; 4068 } else { 4069 reference_offsets = CLASS_WALK_SUPER; 4070 break; 4071 } 4072 } 4073 // Update fields in klass 4074 if (is_static) { 4075 klass->SetReferenceStaticOffsets(reference_offsets); 4076 } else { 4077 klass->SetReferenceInstanceOffsets(reference_offsets); 4078 } 4079} 4080 4081mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4082 Handle<mirror::DexCache> dex_cache) { 4083 DCHECK(dex_cache.Get() != nullptr); 4084 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4085 if (resolved != NULL) { 4086 return resolved; 4087 } 4088 uint32_t utf16_length; 4089 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4090 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4091 dex_cache->SetResolvedString(string_idx, string); 4092 return string; 4093} 4094 4095mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4096 mirror::Class* referrer) { 4097 StackHandleScope<2> hs(Thread::Current()); 4098 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4099 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4100 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4101} 4102 4103mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4104 Handle<mirror::DexCache> dex_cache, 4105 Handle<mirror::ClassLoader> class_loader) { 4106 DCHECK(dex_cache.Get() != NULL); 4107 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4108 if (resolved == NULL) { 4109 Thread* self = Thread::Current(); 4110 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4111 resolved = FindClass(self, descriptor, class_loader); 4112 if (resolved != NULL) { 4113 // TODO: we used to throw here if resolved's class loader was not the 4114 // boot class loader. This was to permit different classes with the 4115 // same name to be loaded simultaneously by different loaders 4116 dex_cache->SetResolvedType(type_idx, resolved); 4117 } else { 4118 CHECK(self->IsExceptionPending()) 4119 << "Expected pending exception for failed resolution of: " << descriptor; 4120 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4121 StackHandleScope<1> hs(self); 4122 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4123 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4124 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4125 self->ClearException(); 4126 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4127 self->GetException(NULL)->SetCause(cause.Get()); 4128 } 4129 } 4130 } 4131 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4132 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4133 return resolved; 4134} 4135 4136mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 4137 Handle<mirror::DexCache> dex_cache, 4138 Handle<mirror::ClassLoader> class_loader, 4139 Handle<mirror::ArtMethod> referrer, 4140 InvokeType type) { 4141 DCHECK(dex_cache.Get() != NULL); 4142 // Check for hit in the dex cache. 4143 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4144 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 4145 return resolved; 4146 } 4147 // Fail, get the declaring class. 4148 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4149 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4150 if (klass == NULL) { 4151 DCHECK(Thread::Current()->IsExceptionPending()); 4152 return NULL; 4153 } 4154 // Scan using method_idx, this saves string compares but will only hit for matching dex 4155 // caches/files. 4156 switch (type) { 4157 case kDirect: // Fall-through. 4158 case kStatic: 4159 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 4160 break; 4161 case kInterface: 4162 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 4163 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4164 break; 4165 case kSuper: // Fall-through. 4166 case kVirtual: 4167 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 4168 break; 4169 default: 4170 LOG(FATAL) << "Unreachable - invocation type: " << type; 4171 } 4172 if (resolved == NULL) { 4173 // Search by name, which works across dex files. 4174 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4175 const Signature signature = dex_file.GetMethodSignature(method_id); 4176 switch (type) { 4177 case kDirect: // Fall-through. 4178 case kStatic: 4179 resolved = klass->FindDirectMethod(name, signature); 4180 break; 4181 case kInterface: 4182 resolved = klass->FindInterfaceMethod(name, signature); 4183 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4184 break; 4185 case kSuper: // Fall-through. 4186 case kVirtual: 4187 resolved = klass->FindVirtualMethod(name, signature); 4188 break; 4189 } 4190 } 4191 if (resolved != NULL) { 4192 // We found a method, check for incompatible class changes. 4193 if (resolved->CheckIncompatibleClassChange(type)) { 4194 resolved = NULL; 4195 } 4196 } 4197 if (resolved != NULL) { 4198 // Be a good citizen and update the dex cache to speed subsequent calls. 4199 dex_cache->SetResolvedMethod(method_idx, resolved); 4200 return resolved; 4201 } else { 4202 // We failed to find the method which means either an access error, an incompatible class 4203 // change, or no such method. First try to find the method among direct and virtual methods. 4204 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4205 const Signature signature = dex_file.GetMethodSignature(method_id); 4206 switch (type) { 4207 case kDirect: 4208 case kStatic: 4209 resolved = klass->FindVirtualMethod(name, signature); 4210 break; 4211 case kInterface: 4212 case kVirtual: 4213 case kSuper: 4214 resolved = klass->FindDirectMethod(name, signature); 4215 break; 4216 } 4217 4218 // If we found something, check that it can be accessed by the referrer. 4219 if (resolved != NULL && referrer.Get() != NULL) { 4220 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4221 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4222 if (!referring_class->CanAccess(methods_class)) { 4223 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4224 resolved, type); 4225 return NULL; 4226 } else if (!referring_class->CanAccessMember(methods_class, 4227 resolved->GetAccessFlags())) { 4228 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4229 return NULL; 4230 } 4231 } 4232 4233 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4234 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4235 switch (type) { 4236 case kDirect: 4237 case kStatic: 4238 if (resolved != NULL) { 4239 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4240 } else { 4241 resolved = klass->FindInterfaceMethod(name, signature); 4242 if (resolved != NULL) { 4243 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4244 } else { 4245 ThrowNoSuchMethodError(type, klass, name, signature); 4246 } 4247 } 4248 break; 4249 case kInterface: 4250 if (resolved != NULL) { 4251 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4252 } else { 4253 resolved = klass->FindVirtualMethod(name, signature); 4254 if (resolved != NULL) { 4255 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4256 } else { 4257 ThrowNoSuchMethodError(type, klass, name, signature); 4258 } 4259 } 4260 break; 4261 case kSuper: 4262 ThrowNoSuchMethodError(type, klass, name, signature); 4263 break; 4264 case kVirtual: 4265 if (resolved != NULL) { 4266 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4267 } else { 4268 resolved = klass->FindInterfaceMethod(name, signature); 4269 if (resolved != NULL) { 4270 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4271 } else { 4272 ThrowNoSuchMethodError(type, klass, name, signature); 4273 } 4274 } 4275 break; 4276 } 4277 DCHECK(Thread::Current()->IsExceptionPending()); 4278 return NULL; 4279 } 4280} 4281 4282mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4283 Handle<mirror::DexCache> dex_cache, 4284 Handle<mirror::ClassLoader> class_loader, 4285 bool is_static) { 4286 DCHECK(dex_cache.Get() != nullptr); 4287 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4288 if (resolved != NULL) { 4289 return resolved; 4290 } 4291 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4292 Thread* const self = Thread::Current(); 4293 StackHandleScope<1> hs(self); 4294 Handle<mirror::Class> klass( 4295 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4296 if (klass.Get() == NULL) { 4297 DCHECK(Thread::Current()->IsExceptionPending()); 4298 return NULL; 4299 } 4300 4301 if (is_static) { 4302 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 4303 } else { 4304 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 4305 } 4306 4307 if (resolved == NULL) { 4308 const char* name = dex_file.GetFieldName(field_id); 4309 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4310 if (is_static) { 4311 resolved = mirror::Class::FindStaticField(self, klass, name, type); 4312 } else { 4313 resolved = klass->FindInstanceField(name, type); 4314 } 4315 if (resolved == NULL) { 4316 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 4317 return NULL; 4318 } 4319 } 4320 dex_cache->SetResolvedField(field_idx, resolved); 4321 return resolved; 4322} 4323 4324mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4325 uint32_t field_idx, 4326 Handle<mirror::DexCache> dex_cache, 4327 Handle<mirror::ClassLoader> class_loader) { 4328 DCHECK(dex_cache.Get() != nullptr); 4329 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4330 if (resolved != NULL) { 4331 return resolved; 4332 } 4333 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4334 Thread* self = Thread::Current(); 4335 StackHandleScope<1> hs(self); 4336 Handle<mirror::Class> klass( 4337 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4338 if (klass.Get() == NULL) { 4339 DCHECK(Thread::Current()->IsExceptionPending()); 4340 return NULL; 4341 } 4342 4343 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4344 StringPiece type(dex_file.StringDataByIdx( 4345 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4346 resolved = mirror::Class::FindField(self, klass, name, type); 4347 if (resolved != NULL) { 4348 dex_cache->SetResolvedField(field_idx, resolved); 4349 } else { 4350 ThrowNoSuchFieldError("", klass.Get(), type, name); 4351 } 4352 return resolved; 4353} 4354 4355const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4356 uint32_t* length) { 4357 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4358 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4359 const DexFile& dex_file = *dex_cache->GetDexFile(); 4360 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4361 return dex_file.GetMethodShorty(method_id, length); 4362} 4363 4364void ClassLinker::DumpAllClasses(int flags) { 4365 if (dex_cache_image_class_lookup_required_) { 4366 MoveImageClassesToClassTable(); 4367 } 4368 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4369 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4370 std::vector<mirror::Class*> all_classes; 4371 { 4372 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4373 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 4374 mirror::Class** root = &it.second; 4375 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 4376 all_classes.push_back(klass); 4377 } 4378 } 4379 4380 for (size_t i = 0; i < all_classes.size(); ++i) { 4381 all_classes[i]->DumpClass(std::cerr, flags); 4382 } 4383} 4384 4385void ClassLinker::DumpForSigQuit(std::ostream& os) { 4386 if (dex_cache_image_class_lookup_required_) { 4387 MoveImageClassesToClassTable(); 4388 } 4389 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4390 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4391} 4392 4393size_t ClassLinker::NumLoadedClasses() { 4394 if (dex_cache_image_class_lookup_required_) { 4395 MoveImageClassesToClassTable(); 4396 } 4397 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4398 return class_table_.size(); 4399} 4400 4401pid_t ClassLinker::GetClassesLockOwner() { 4402 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4403} 4404 4405pid_t ClassLinker::GetDexLockOwner() { 4406 return dex_lock_.GetExclusiveOwnerTid(); 4407} 4408 4409void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4410 DCHECK(!init_done_); 4411 4412 DCHECK(klass != NULL); 4413 DCHECK(klass->GetClassLoader() == NULL); 4414 4415 DCHECK(class_roots_ != NULL); 4416 DCHECK(class_roots_->Get(class_root) == NULL); 4417 class_roots_->Set<false>(class_root, klass); 4418} 4419 4420} // namespace art 4421