class_linker.cc revision a91a4bc1f8960f64c5f7e4616d46e21b8e1bfba2
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 1064// Keep in sync with InitCallback. Anything we visit, we need to 1065// reinit references to when reinitializing a ClassLinker from a 1066// mapped image. 1067void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1068 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1069 Thread* self = Thread::Current(); 1070 { 1071 ReaderMutexLock mu(self, dex_lock_); 1072 if ((flags & kVisitRootFlagAllRoots) != 0) { 1073 for (mirror::DexCache*& dex_cache : dex_caches_) { 1074 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1075 } 1076 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1077 for (size_t index : new_dex_cache_roots_) { 1078 callback(reinterpret_cast<mirror::Object**>(&dex_caches_[index]), arg, 0, kRootVMInternal); 1079 } 1080 } 1081 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1082 new_dex_cache_roots_.clear(); 1083 } 1084 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1085 log_new_dex_caches_roots_ = true; 1086 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1087 log_new_dex_caches_roots_ = false; 1088 } 1089 } 1090 { 1091 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 1092 if ((flags & kVisitRootFlagAllRoots) != 0) { 1093 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1094 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1095 } 1096 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1097 for (auto& pair : new_class_roots_) { 1098 mirror::Object* old_ref = pair.second; 1099 callback(reinterpret_cast<mirror::Object**>(&pair.second), arg, 0, kRootStickyClass); 1100 if (UNLIKELY(pair.second != old_ref)) { 1101 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1102 // corresponding object. This is slow, but luckily for us, this may only happen with a 1103 // concurrent moving GC. 1104 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1105 it != end && it->first == pair.first; ++it) { 1106 // If the class stored matches the old class, update it to the new value. 1107 if (old_ref == it->second) { 1108 it->second = pair.second; 1109 } 1110 } 1111 } 1112 } 1113 } 1114 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1115 new_class_roots_.clear(); 1116 } 1117 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1118 log_new_class_table_roots_ = true; 1119 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1120 log_new_class_table_roots_ = false; 1121 } 1122 // We deliberately ignore the class roots in the image since we 1123 // handle image roots by using the MS/CMS rescanning of dirty cards. 1124 } 1125 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1126 DCHECK(array_iftable_ != nullptr); 1127 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1128 if (find_array_class_cache_[i] != nullptr) { 1129 callback(reinterpret_cast<mirror::Object**>(&find_array_class_cache_[i]), arg, 0, 1130 kRootVMInternal); 1131 } 1132 } 1133} 1134 1135void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1136 if (dex_cache_image_class_lookup_required_) { 1137 MoveImageClassesToClassTable(); 1138 } 1139 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1140 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1141 mirror::Class** root = &it.second; 1142 mirror::Class* c = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 1143 if (!visitor(c, arg)) { 1144 return; 1145 } 1146 } 1147} 1148 1149static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1150 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1151 classes->insert(c); 1152 return true; 1153} 1154 1155void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1156 std::set<mirror::Class*> classes; 1157 VisitClasses(GetClassesVisitor, &classes); 1158 for (mirror::Class* klass : classes) { 1159 if (!visitor(klass, arg)) { 1160 return; 1161 } 1162 } 1163} 1164 1165ClassLinker::~ClassLinker() { 1166 mirror::Class::ResetClass(); 1167 mirror::String::ResetClass(); 1168 mirror::ArtField::ResetClass(); 1169 mirror::ArtMethod::ResetClass(); 1170 mirror::BooleanArray::ResetArrayClass(); 1171 mirror::ByteArray::ResetArrayClass(); 1172 mirror::CharArray::ResetArrayClass(); 1173 mirror::DoubleArray::ResetArrayClass(); 1174 mirror::FloatArray::ResetArrayClass(); 1175 mirror::IntArray::ResetArrayClass(); 1176 mirror::LongArray::ResetArrayClass(); 1177 mirror::ShortArray::ResetArrayClass(); 1178 mirror::Throwable::ResetClass(); 1179 mirror::StackTraceElement::ResetClass(); 1180 STLDeleteElements(&boot_class_path_); 1181 STLDeleteElements(&oat_files_); 1182} 1183 1184mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1185 gc::Heap* heap = Runtime::Current()->GetHeap(); 1186 StackHandleScope<16> hs(self); 1187 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1188 Handle<mirror::DexCache> dex_cache( 1189 hs.NewHandle(down_cast<mirror::DexCache*>( 1190 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1191 VoidFunctor())))); 1192 if (dex_cache.Get() == NULL) { 1193 return NULL; 1194 } 1195 Handle<mirror::String> 1196 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1197 if (location.Get() == NULL) { 1198 return NULL; 1199 } 1200 Handle<mirror::ObjectArray<mirror::String>> 1201 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1202 if (strings.Get() == NULL) { 1203 return NULL; 1204 } 1205 Handle<mirror::ObjectArray<mirror::Class>> 1206 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1207 if (types.Get() == NULL) { 1208 return NULL; 1209 } 1210 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1211 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1212 if (methods.Get() == NULL) { 1213 return NULL; 1214 } 1215 Handle<mirror::ObjectArray<mirror::ArtField>> 1216 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1217 if (fields.Get() == NULL) { 1218 return NULL; 1219 } 1220 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1221 fields.Get()); 1222 return dex_cache.Get(); 1223} 1224 1225// Used to initialize a class in the allocation code path to ensure it is guarded by a StoreStore 1226// fence. 1227class InitializeClassVisitor { 1228 public: 1229 explicit InitializeClassVisitor(uint32_t class_size) : class_size_(class_size) { 1230 } 1231 1232 void operator()(mirror::Object* obj, size_t usable_size) const 1233 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1234 DCHECK_LE(class_size_, usable_size); 1235 // Avoid AsClass as object is not yet in live bitmap or allocation stack. 1236 mirror::Class* klass = down_cast<mirror::Class*>(obj); 1237 // DCHECK(klass->IsClass()); 1238 klass->SetClassSize(class_size_); 1239 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1240 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1241 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1242 } 1243 1244 private: 1245 const uint32_t class_size_; 1246 1247 DISALLOW_COPY_AND_ASSIGN(InitializeClassVisitor); 1248}; 1249 1250mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1251 uint32_t class_size) { 1252 DCHECK_GE(class_size, sizeof(mirror::Class)); 1253 gc::Heap* heap = Runtime::Current()->GetHeap(); 1254 InitializeClassVisitor visitor(class_size); 1255 mirror::Object* k = (kMovingClasses) ? 1256 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1257 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1258 if (UNLIKELY(k == nullptr)) { 1259 CHECK(self->IsExceptionPending()); // OOME. 1260 return nullptr; 1261 } 1262 return k->AsClass(); 1263} 1264 1265mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1266 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1267} 1268 1269mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1270 return down_cast<mirror::ArtField*>( 1271 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1272} 1273 1274mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1275 return down_cast<mirror::ArtMethod*>( 1276 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1277} 1278 1279mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1280 Thread* self, size_t length) { 1281 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1282 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1283} 1284 1285static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1286 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1287 DCHECK(klass != NULL); 1288 // Wait for the class if it has not already been linked. 1289 if (!klass->IsResolved() && !klass->IsErroneous()) { 1290 StackHandleScope<1> hs(self); 1291 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1292 ObjectLock<mirror::Class> lock(self, h_class); 1293 // Check for circular dependencies between classes. 1294 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1295 ThrowClassCircularityError(h_class.Get()); 1296 h_class->SetStatus(mirror::Class::kStatusError, self); 1297 return nullptr; 1298 } 1299 // Wait for the pending initialization to complete. 1300 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1301 lock.WaitIgnoringInterrupts(); 1302 } 1303 } 1304 if (klass->IsErroneous()) { 1305 ThrowEarlierClassFailure(klass); 1306 return nullptr; 1307 } 1308 // Return the loaded class. No exceptions should be pending. 1309 CHECK(klass->IsResolved()) << PrettyClass(klass); 1310 self->AssertNoPendingException(); 1311 return klass; 1312} 1313 1314mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1315 Handle<mirror::ClassLoader> class_loader) { 1316 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1317 DCHECK(self != nullptr); 1318 self->AssertNoPendingException(); 1319 if (descriptor[1] == '\0') { 1320 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1321 // for primitive classes that aren't backed by dex files. 1322 return FindPrimitiveClass(descriptor[0]); 1323 } 1324 // Find the class in the loaded classes table. 1325 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1326 if (klass != NULL) { 1327 return EnsureResolved(self, klass); 1328 } 1329 // Class is not yet loaded. 1330 if (descriptor[0] == '[') { 1331 return CreateArrayClass(self, descriptor, class_loader); 1332 } else if (class_loader.Get() == nullptr) { 1333 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1334 if (pair.second != NULL) { 1335 StackHandleScope<1> hs(self); 1336 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1337 } 1338 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1339 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1340 // throw of a NoClassDefFoundError. 1341 if (IsInBootClassPath(descriptor)) { 1342 mirror::Class* system_class = FindSystemClass(self, descriptor); 1343 CHECK(system_class != NULL); 1344 return system_class; 1345 } 1346 // Next try the compile time class path. 1347 const std::vector<const DexFile*>* class_path; 1348 { 1349 ScopedObjectAccessUnchecked soa(self); 1350 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1351 soa.AddLocalReference<jobject>(class_loader.Get())); 1352 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1353 } 1354 1355 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1356 if (pair.second != NULL) { 1357 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1358 } 1359 1360 } else { 1361 ScopedObjectAccessUnchecked soa(self); 1362 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1363 soa.AddLocalReference<jobject>(class_loader.Get())); 1364 std::string class_name_string(DescriptorToDot(descriptor)); 1365 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1366 { 1367 ScopedThreadStateChange tsc(self, kNative); 1368 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1369 soa.Env()->NewStringUTF(class_name_string.c_str())); 1370 if (class_name_object.get() == NULL) { 1371 return NULL; 1372 } 1373 CHECK(class_loader_object.get() != NULL); 1374 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1375 WellKnownClasses::java_lang_ClassLoader_loadClass, 1376 class_name_object.get())); 1377 } 1378 if (self->IsExceptionPending()) { 1379 // If the ClassLoader threw, pass that exception up. 1380 return NULL; 1381 } else if (result.get() == NULL) { 1382 // broken loader - throw NPE to be compatible with Dalvik 1383 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1384 class_name_string.c_str()).c_str()); 1385 return NULL; 1386 } else { 1387 // success, return mirror::Class* 1388 return soa.Decode<mirror::Class*>(result.get()); 1389 } 1390 } 1391 1392 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1393 return NULL; 1394} 1395 1396mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1397 Handle<mirror::ClassLoader> class_loader, 1398 const DexFile& dex_file, 1399 const DexFile::ClassDef& dex_class_def) { 1400 Thread* self = Thread::Current(); 1401 StackHandleScope<2> hs(self); 1402 auto klass = hs.NewHandle<mirror::Class>(nullptr); 1403 // Load the class from the dex file. 1404 if (UNLIKELY(!init_done_)) { 1405 // finish up init of hand crafted class_roots_ 1406 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1407 klass.Assign(GetClassRoot(kJavaLangObject)); 1408 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1409 klass.Assign(GetClassRoot(kJavaLangClass)); 1410 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1411 klass.Assign(GetClassRoot(kJavaLangString)); 1412 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1413 klass.Assign(GetClassRoot(kJavaLangDexCache)); 1414 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1415 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 1416 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1417 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 1418 } else { 1419 klass.Assign(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1420 } 1421 } else { 1422 klass.Assign(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1423 } 1424 if (UNLIKELY(klass.Get() == NULL)) { 1425 CHECK(self->IsExceptionPending()); // Expect an OOME. 1426 return NULL; 1427 } 1428 klass->SetDexCache(FindDexCache(dex_file)); 1429 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 1430 // Check for a pending exception during load 1431 if (self->IsExceptionPending()) { 1432 klass->SetStatus(mirror::Class::kStatusError, self); 1433 return NULL; 1434 } 1435 ObjectLock<mirror::Class> lock(self, klass); 1436 klass->SetClinitThreadId(self->GetTid()); 1437 // Add the newly loaded class to the loaded classes table. 1438 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 1439 if (existing != NULL) { 1440 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1441 // this thread to block. 1442 return EnsureResolved(self, existing); 1443 } 1444 // Finish loading (if necessary) by finding parents 1445 CHECK(!klass->IsLoaded()); 1446 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1447 // Loading failed. 1448 klass->SetStatus(mirror::Class::kStatusError, self); 1449 return NULL; 1450 } 1451 CHECK(klass->IsLoaded()); 1452 // Link the class (if necessary) 1453 CHECK(!klass->IsResolved()); 1454 // TODO: Use fast jobjects? 1455 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1456 if (!LinkClass(self, klass, interfaces)) { 1457 // Linking failed. 1458 klass->SetStatus(mirror::Class::kStatusError, self); 1459 return NULL; 1460 } 1461 CHECK(klass->IsResolved()); 1462 1463 /* 1464 * We send CLASS_PREPARE events to the debugger from here. The 1465 * definition of "preparation" is creating the static fields for a 1466 * class and initializing them to the standard default values, but not 1467 * executing any code (that comes later, during "initialization"). 1468 * 1469 * We did the static preparation in LinkClass. 1470 * 1471 * The class has been prepared and resolved but possibly not yet verified 1472 * at this point. 1473 */ 1474 Dbg::PostClassPrepare(klass.Get()); 1475 1476 return klass.Get(); 1477} 1478 1479// Precomputes size that will be needed for Class, matching LinkStaticFields 1480uint32_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1481 const DexFile::ClassDef& dex_class_def) { 1482 const byte* class_data = dex_file.GetClassData(dex_class_def); 1483 size_t num_ref = 0; 1484 size_t num_32 = 0; 1485 size_t num_64 = 0; 1486 if (class_data != NULL) { 1487 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1488 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1489 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1490 char c = descriptor[0]; 1491 if (c == 'L' || c == '[') { 1492 num_ref++; 1493 } else if (c == 'J' || c == 'D') { 1494 num_64++; 1495 } else { 1496 num_32++; 1497 } 1498 } 1499 } 1500 // start with generic class data 1501 uint32_t size = sizeof(mirror::Class); 1502 // follow with reference fields which must be contiguous at start 1503 size += (num_ref * sizeof(uint32_t)); 1504 // if there are 64-bit fields to add, make sure they are aligned 1505 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1506 if (num_32 != 0) { 1507 // use an available 32-bit field for padding 1508 num_32--; 1509 } 1510 size += sizeof(uint32_t); // either way, we are adding a word 1511 DCHECK_EQ(size, RoundUp(size, 8)); 1512 } 1513 // tack on any 64-bit fields now that alignment is assured 1514 size += (num_64 * sizeof(uint64_t)); 1515 // tack on any remaining 32-bit fields 1516 size += (num_32 * sizeof(uint32_t)); 1517 return size; 1518} 1519 1520OatFile::OatClass ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1521 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1522 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1523 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1524 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1525 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1526 &dex_location_checksum); 1527 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1528 return oat_dex_file->GetOatClass(class_def_idx); 1529} 1530 1531static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1532 uint32_t method_idx) { 1533 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1534 const byte* class_data = dex_file.GetClassData(class_def); 1535 CHECK(class_data != NULL); 1536 ClassDataItemIterator it(dex_file, class_data); 1537 // Skip fields 1538 while (it.HasNextStaticField()) { 1539 it.Next(); 1540 } 1541 while (it.HasNextInstanceField()) { 1542 it.Next(); 1543 } 1544 // Process methods 1545 size_t class_def_method_index = 0; 1546 while (it.HasNextDirectMethod()) { 1547 if (it.GetMemberIndex() == method_idx) { 1548 return class_def_method_index; 1549 } 1550 class_def_method_index++; 1551 it.Next(); 1552 } 1553 while (it.HasNextVirtualMethod()) { 1554 if (it.GetMemberIndex() == method_idx) { 1555 return class_def_method_index; 1556 } 1557 class_def_method_index++; 1558 it.Next(); 1559 } 1560 DCHECK(!it.HasNext()); 1561 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1562 return 0; 1563} 1564 1565const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1566 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1567 // method for direct methods (or virtual methods made direct). 1568 mirror::Class* declaring_class = method->GetDeclaringClass(); 1569 size_t oat_method_index; 1570 if (method->IsStatic() || method->IsDirect()) { 1571 // Simple case where the oat method index was stashed at load time. 1572 oat_method_index = method->GetMethodIndex(); 1573 } else { 1574 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1575 // by search for its position in the declared virtual methods. 1576 oat_method_index = declaring_class->NumDirectMethods(); 1577 size_t end = declaring_class->NumVirtualMethods(); 1578 bool found = false; 1579 for (size_t i = 0; i < end; i++) { 1580 if (declaring_class->GetVirtualMethod(i) == method) { 1581 found = true; 1582 break; 1583 } 1584 oat_method_index++; 1585 } 1586 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1587 } 1588 DCHECK_EQ(oat_method_index, 1589 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1590 method->GetDeclaringClass()->GetDexClassDefIndex(), 1591 method->GetDexMethodIndex())); 1592 const OatFile::OatClass oat_class = GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1593 declaring_class->GetDexClassDefIndex()); 1594 1595 return oat_class.GetOatMethod(oat_method_index); 1596} 1597 1598// Special case to get oat code without overwriting a trampoline. 1599const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1600 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1601 if (method->IsProxyMethod()) { 1602 return GetQuickProxyInvokeHandler(); 1603 } 1604 const void* result = GetOatMethodFor(method).GetQuickCode(); 1605 if (result == nullptr) { 1606 if (method->IsNative()) { 1607 // No code and native? Use generic trampoline. 1608 result = GetQuickGenericJniTrampoline(); 1609 } else if (method->IsPortableCompiled()) { 1610 // No code? Do we expect portable code? 1611 result = GetQuickToPortableBridge(); 1612 } else { 1613 // No code? You must mean to go into the interpreter. 1614 result = GetQuickToInterpreterBridge(); 1615 } 1616 } 1617 return result; 1618} 1619 1620const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1621 bool* have_portable_code) { 1622 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1623 *have_portable_code = false; 1624 if (method->IsProxyMethod()) { 1625 return GetPortableProxyInvokeHandler(); 1626 } 1627 const OatFile::OatMethod oat_method = GetOatMethodFor(method); 1628 const void* result = oat_method.GetPortableCode(); 1629 if (result == nullptr) { 1630 if (oat_method.GetQuickCode() == nullptr) { 1631 // No code? You must mean to go into the interpreter. 1632 result = GetPortableToInterpreterBridge(); 1633 } else { 1634 // No code? But there's quick code, so use a bridge. 1635 result = GetPortableToQuickBridge(); 1636 } 1637 } else { 1638 *have_portable_code = true; 1639 } 1640 return result; 1641} 1642 1643const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1644 uint32_t method_idx) { 1645 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1646 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1647 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 1648} 1649 1650const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1651 uint32_t method_idx) { 1652 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1653 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1654 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 1655} 1656 1657// Returns true if the method must run with interpreter, false otherwise. 1658static bool NeedsInterpreter( 1659 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 1660 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1661 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1662 // No code: need interpreter. 1663 // May return true for native code, in the case of generic JNI 1664 // DCHECK(!method->IsNative()); 1665 return true; 1666 } 1667#ifdef ART_SEA_IR_MODE 1668 ScopedObjectAccess soa(Thread::Current()); 1669 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1670 LOG(INFO) << "Found " << PrettyMethod(method); 1671 return false; 1672 } 1673#endif 1674 // If interpreter mode is enabled, every method (except native and proxy) must 1675 // be run with interpreter. 1676 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1677 !method->IsNative() && !method->IsProxyMethod(); 1678} 1679 1680void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1681 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1682 if (klass->NumDirectMethods() == 0) { 1683 return; // No direct methods => no static methods. 1684 } 1685 Runtime* runtime = Runtime::Current(); 1686 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1687 return; // OAT file unavailable. 1688 } 1689 const DexFile& dex_file = klass->GetDexFile(); 1690 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 1691 CHECK(dex_class_def != nullptr); 1692 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1693 // There should always be class data if there were direct methods. 1694 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1695 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 1696 ClassDataItemIterator it(dex_file, class_data); 1697 // Skip fields 1698 while (it.HasNextStaticField()) { 1699 it.Next(); 1700 } 1701 while (it.HasNextInstanceField()) { 1702 it.Next(); 1703 } 1704 // Link the code of methods skipped by LinkCode. 1705 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1706 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1707 if (!method->IsStatic()) { 1708 // Only update static methods. 1709 continue; 1710 } 1711 const void* portable_code = oat_class.GetOatMethod(method_index).GetPortableCode(); 1712 const void* quick_code = oat_class.GetOatMethod(method_index).GetQuickCode(); 1713 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1714 bool have_portable_code = false; 1715 if (enter_interpreter) { 1716 // Use interpreter entry point. 1717 // Check whether the method is native, in which case it's generic JNI. 1718 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 1719 quick_code = GetQuickGenericJniTrampoline(); 1720 portable_code = GetPortableToQuickBridge(); 1721 } else { 1722 portable_code = GetPortableToInterpreterBridge(); 1723 quick_code = GetQuickToInterpreterBridge(); 1724 } 1725 } else { 1726 if (portable_code == nullptr) { 1727 portable_code = GetPortableToQuickBridge(); 1728 } else { 1729 have_portable_code = true; 1730 } 1731 if (quick_code == nullptr) { 1732 quick_code = GetQuickToPortableBridge(); 1733 } 1734 } 1735 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1736 have_portable_code); 1737 } 1738 // Ignore virtual methods on the iterator. 1739} 1740 1741void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 1742 const DexFile& dex_file, uint32_t dex_method_index, 1743 uint32_t method_index) { 1744 // Method shouldn't have already been linked. 1745 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1746 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1747 // Every kind of method should at least get an invoke stub from the oat_method. 1748 // non-abstract methods also get their code pointers. 1749 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1750 oat_method.LinkMethod(method.Get()); 1751 1752 // Install entry point from interpreter. 1753 Runtime* runtime = Runtime::Current(); 1754 bool enter_interpreter = NeedsInterpreter(method.Get(), 1755 method->GetEntryPointFromQuickCompiledCode(), 1756 method->GetEntryPointFromPortableCompiledCode()); 1757 if (enter_interpreter && !method->IsNative()) { 1758 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1759 } else { 1760 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1761 } 1762 1763 if (method->IsAbstract()) { 1764 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1765 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1766 return; 1767 } 1768 1769 bool have_portable_code = false; 1770 if (method->IsStatic() && !method->IsConstructor()) { 1771 // For static methods excluding the class initializer, install the trampoline. 1772 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1773 // after initializing class (see ClassLinker::InitializeClass method). 1774 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 1775 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 1776 } else if (enter_interpreter) { 1777 if (!method->IsNative()) { 1778 // Set entry point from compiled code if there's no code or in interpreter only mode. 1779 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1780 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1781 } else { 1782 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 1783 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1784 } 1785 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1786 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1787 have_portable_code = true; 1788 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1789 } else { 1790 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1791 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1792 } 1793 1794 if (method->IsNative()) { 1795 // Unregistering restores the dlsym lookup stub. 1796 method->UnregisterNative(Thread::Current()); 1797 1798 if (enter_interpreter) { 1799 // We have a native method here without code. Then it should have either the GenericJni 1800 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 1801 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 1802 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 1803 } 1804 } 1805 1806 // Allow instrumentation its chance to hijack code. 1807 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 1808 method->GetEntryPointFromQuickCompiledCode(), 1809 method->GetEntryPointFromPortableCompiledCode(), 1810 have_portable_code); 1811} 1812 1813void ClassLinker::LoadClass(const DexFile& dex_file, 1814 const DexFile::ClassDef& dex_class_def, 1815 Handle<mirror::Class> klass, 1816 mirror::ClassLoader* class_loader) { 1817 CHECK(klass.Get() != NULL); 1818 CHECK(klass->GetDexCache() != NULL); 1819 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1820 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1821 CHECK(descriptor != NULL); 1822 1823 klass->SetClass(GetClassRoot(kJavaLangClass)); 1824 if (kUseBakerOrBrooksReadBarrier) { 1825 klass->AssertReadBarrierPointer(); 1826 } 1827 uint32_t access_flags = dex_class_def.access_flags_; 1828 // Make sure that none of our runtime-only flags are set. 1829 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1830 klass->SetAccessFlags(access_flags); 1831 klass->SetClassLoader(class_loader); 1832 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1833 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1834 1835 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1836 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1837 1838 const byte* class_data = dex_file.GetClassData(dex_class_def); 1839 if (class_data == NULL) { 1840 return; // no fields or methods - for example a marker interface 1841 } 1842 1843 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1844 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 1845 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 1846 } else { 1847 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 1848 } 1849} 1850 1851void ClassLinker::LoadClassMembers(const DexFile& dex_file, 1852 const byte* class_data, 1853 Handle<mirror::Class> klass, 1854 mirror::ClassLoader* class_loader, 1855 const OatFile::OatClass* oat_class) { 1856 // Load fields. 1857 ClassDataItemIterator it(dex_file, class_data); 1858 Thread* self = Thread::Current(); 1859 if (it.NumStaticFields() != 0) { 1860 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1861 if (UNLIKELY(statics == NULL)) { 1862 CHECK(self->IsExceptionPending()); // OOME. 1863 return; 1864 } 1865 klass->SetSFields(statics); 1866 } 1867 if (it.NumInstanceFields() != 0) { 1868 mirror::ObjectArray<mirror::ArtField>* fields = 1869 AllocArtFieldArray(self, it.NumInstanceFields()); 1870 if (UNLIKELY(fields == NULL)) { 1871 CHECK(self->IsExceptionPending()); // OOME. 1872 return; 1873 } 1874 klass->SetIFields(fields); 1875 } 1876 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1877 StackHandleScope<1> hs(self); 1878 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 1879 if (UNLIKELY(sfield.Get() == NULL)) { 1880 CHECK(self->IsExceptionPending()); // OOME. 1881 return; 1882 } 1883 klass->SetStaticField(i, sfield.Get()); 1884 LoadField(dex_file, it, klass, sfield); 1885 } 1886 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1887 StackHandleScope<1> hs(self); 1888 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 1889 if (UNLIKELY(ifield.Get() == NULL)) { 1890 CHECK(self->IsExceptionPending()); // OOME. 1891 return; 1892 } 1893 klass->SetInstanceField(i, ifield.Get()); 1894 LoadField(dex_file, it, klass, ifield); 1895 } 1896 1897 // Load methods. 1898 if (it.NumDirectMethods() != 0) { 1899 // TODO: append direct methods to class object 1900 mirror::ObjectArray<mirror::ArtMethod>* directs = 1901 AllocArtMethodArray(self, it.NumDirectMethods()); 1902 if (UNLIKELY(directs == NULL)) { 1903 CHECK(self->IsExceptionPending()); // OOME. 1904 return; 1905 } 1906 klass->SetDirectMethods(directs); 1907 } 1908 if (it.NumVirtualMethods() != 0) { 1909 // TODO: append direct methods to class object 1910 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1911 AllocArtMethodArray(self, it.NumVirtualMethods()); 1912 if (UNLIKELY(virtuals == NULL)) { 1913 CHECK(self->IsExceptionPending()); // OOME. 1914 return; 1915 } 1916 klass->SetVirtualMethods(virtuals); 1917 } 1918 size_t class_def_method_index = 0; 1919 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1920 StackHandleScope<1> hs(self); 1921 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 1922 if (UNLIKELY(method.Get() == NULL)) { 1923 CHECK(self->IsExceptionPending()); // OOME. 1924 return; 1925 } 1926 klass->SetDirectMethod(i, method.Get()); 1927 if (oat_class != nullptr) { 1928 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 1929 } 1930 method->SetMethodIndex(class_def_method_index); 1931 class_def_method_index++; 1932 } 1933 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1934 StackHandleScope<1> hs(self); 1935 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 1936 if (UNLIKELY(method.Get() == NULL)) { 1937 CHECK(self->IsExceptionPending()); // OOME. 1938 return; 1939 } 1940 klass->SetVirtualMethod(i, method.Get()); 1941 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1942 if (oat_class != nullptr) { 1943 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 1944 } 1945 class_def_method_index++; 1946 } 1947 DCHECK(!it.HasNext()); 1948} 1949 1950void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1951 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 1952 uint32_t field_idx = it.GetMemberIndex(); 1953 dst->SetDexFieldIndex(field_idx); 1954 dst->SetDeclaringClass(klass.Get()); 1955 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1956} 1957 1958mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1959 const ClassDataItemIterator& it, 1960 Handle<mirror::Class> klass) { 1961 uint32_t dex_method_idx = it.GetMemberIndex(); 1962 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1963 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 1964 1965 mirror::ArtMethod* dst = AllocArtMethod(self); 1966 if (UNLIKELY(dst == NULL)) { 1967 CHECK(self->IsExceptionPending()); // OOME. 1968 return NULL; 1969 } 1970 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 1971 1972 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 1973 dst->SetDexMethodIndex(dex_method_idx); 1974 dst->SetDeclaringClass(klass.Get()); 1975 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 1976 1977 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 1978 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 1979 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 1980 1981 uint32_t access_flags = it.GetMemberAccessFlags(); 1982 1983 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 1984 // Set finalizable flag on declaring class. 1985 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 1986 // Void return type. 1987 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 1988 klass->SetFinalizable(); 1989 } else { 1990 std::string klass_descriptor = klass->GetDescriptor(); 1991 // The Enum class declares a "final" finalize() method to prevent subclasses from 1992 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 1993 // subclasses, so we exclude it here. 1994 // We also want to avoid setting the flag on Object, where we know that finalize() is 1995 // empty. 1996 if (klass_descriptor.compare("Ljava/lang/Object;") != 0 && 1997 klass_descriptor.compare("Ljava/lang/Enum;") != 0) { 1998 klass->SetFinalizable(); 1999 } 2000 } 2001 } 2002 } else if (method_name[0] == '<') { 2003 // Fix broken access flags for initializers. Bug 11157540. 2004 bool is_init = (strcmp("<init>", method_name) == 0); 2005 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2006 if (UNLIKELY(!is_init && !is_clinit)) { 2007 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2008 } else { 2009 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2010 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2011 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2012 access_flags |= kAccConstructor; 2013 } 2014 } 2015 } 2016 dst->SetAccessFlags(access_flags); 2017 2018 self->EndAssertNoThreadSuspension(old_cause); 2019 return dst; 2020} 2021 2022void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2023 Thread* self = Thread::Current(); 2024 StackHandleScope<1> hs(self); 2025 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2026 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2027 AppendToBootClassPath(dex_file, dex_cache); 2028} 2029 2030void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2031 Handle<mirror::DexCache> dex_cache) { 2032 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2033 boot_class_path_.push_back(&dex_file); 2034 RegisterDexFile(dex_file, dex_cache); 2035} 2036 2037bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 2038 dex_lock_.AssertSharedHeld(Thread::Current()); 2039 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2040 if (dex_caches_[i]->GetDexFile() == &dex_file) { 2041 return true; 2042 } 2043 } 2044 return false; 2045} 2046 2047bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 2048 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2049 return IsDexFileRegisteredLocked(dex_file); 2050} 2051 2052void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2053 Handle<mirror::DexCache> dex_cache) { 2054 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2055 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2056 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2057 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2058 dex_caches_.push_back(dex_cache.Get()); 2059 dex_cache->SetDexFile(&dex_file); 2060 if (log_new_dex_caches_roots_) { 2061 // TODO: This is not safe if we can remove dex caches. 2062 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2063 } 2064} 2065 2066void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2067 Thread* self = Thread::Current(); 2068 { 2069 ReaderMutexLock mu(self, dex_lock_); 2070 if (IsDexFileRegisteredLocked(dex_file)) { 2071 return; 2072 } 2073 } 2074 // Don't alloc while holding the lock, since allocation may need to 2075 // suspend all threads and another thread may need the dex_lock_ to 2076 // get to a suspend point. 2077 StackHandleScope<1> hs(self); 2078 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2079 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2080 { 2081 WriterMutexLock mu(self, dex_lock_); 2082 if (IsDexFileRegisteredLocked(dex_file)) { 2083 return; 2084 } 2085 RegisterDexFileLocked(dex_file, dex_cache); 2086 } 2087} 2088 2089void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2090 Handle<mirror::DexCache> dex_cache) { 2091 WriterMutexLock mu(Thread::Current(), dex_lock_); 2092 RegisterDexFileLocked(dex_file, dex_cache); 2093} 2094 2095mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 2096 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2097 // Search assuming unique-ness of dex file. 2098 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2099 mirror::DexCache* dex_cache = dex_caches_[i]; 2100 if (dex_cache->GetDexFile() == &dex_file) { 2101 return dex_cache; 2102 } 2103 } 2104 // Search matching by location name. 2105 std::string location(dex_file.GetLocation()); 2106 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2107 mirror::DexCache* dex_cache = dex_caches_[i]; 2108 if (dex_cache->GetDexFile()->GetLocation() == location) { 2109 return dex_cache; 2110 } 2111 } 2112 // Failure, dump diagnostic and abort. 2113 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2114 mirror::DexCache* dex_cache = dex_caches_[i]; 2115 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2116 } 2117 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2118 return NULL; 2119} 2120 2121void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 2122 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2123 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2124 dex_caches_[i]->Fixup(resolution_method); 2125 } 2126} 2127 2128mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2129 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2130 if (UNLIKELY(klass == NULL)) { 2131 return NULL; 2132 } 2133 return InitializePrimitiveClass(klass, type); 2134} 2135 2136mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2137 Primitive::Type type) { 2138 CHECK(primitive_class != NULL); 2139 // Must hold lock on object when initializing. 2140 Thread* self = Thread::Current(); 2141 StackHandleScope<1> hs(self); 2142 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2143 ObjectLock<mirror::Class> lock(self, h_class); 2144 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2145 primitive_class->SetPrimitiveType(type); 2146 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2147 const char* descriptor = Primitive::Descriptor(type); 2148 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2149 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2150 return primitive_class; 2151} 2152 2153// Create an array class (i.e. the class object for the array, not the 2154// array itself). "descriptor" looks like "[C" or "[[[[B" or 2155// "[Ljava/lang/String;". 2156// 2157// If "descriptor" refers to an array of primitives, look up the 2158// primitive type's internally-generated class object. 2159// 2160// "class_loader" is the class loader of the class that's referring to 2161// us. It's used to ensure that we're looking for the element type in 2162// the right context. It does NOT become the class loader for the 2163// array class; that always comes from the base element class. 2164// 2165// Returns NULL with an exception raised on failure. 2166mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2167 Handle<mirror::ClassLoader> class_loader) { 2168 // Identify the underlying component type 2169 CHECK_EQ('[', descriptor[0]); 2170 StackHandleScope<2> hs(self); 2171 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2172 if (component_type.Get() == nullptr) { 2173 DCHECK(self->IsExceptionPending()); 2174 return nullptr; 2175 } 2176 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2177 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2178 return nullptr; 2179 } 2180 // See if the component type is already loaded. Array classes are 2181 // always associated with the class loader of their underlying 2182 // element type -- an array of Strings goes with the loader for 2183 // java/lang/String -- so we need to look for it there. (The 2184 // caller should have checked for the existence of the class 2185 // before calling here, but they did so with *their* class loader, 2186 // not the component type's loader.) 2187 // 2188 // If we find it, the caller adds "loader" to the class' initiating 2189 // loader list, which should prevent us from going through this again. 2190 // 2191 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2192 // are the same, because our caller (FindClass) just did the 2193 // lookup. (Even if we get this wrong we still have correct behavior, 2194 // because we effectively do this lookup again when we add the new 2195 // class to the hash table --- necessary because of possible races with 2196 // other threads.) 2197 if (class_loader.Get() != component_type->GetClassLoader()) { 2198 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2199 if (new_class != NULL) { 2200 return new_class; 2201 } 2202 } 2203 2204 // Fill out the fields in the Class. 2205 // 2206 // It is possible to execute some methods against arrays, because 2207 // all arrays are subclasses of java_lang_Object_, so we need to set 2208 // up a vtable. We can just point at the one in java_lang_Object_. 2209 // 2210 // Array classes are simple enough that we don't need to do a full 2211 // link step. 2212 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2213 if (UNLIKELY(!init_done_)) { 2214 // Classes that were hand created, ie not by FindSystemClass 2215 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2216 new_class.Assign(GetClassRoot(kClassArrayClass)); 2217 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2218 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2219 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2220 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2221 } else if (strcmp(descriptor, 2222 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2223 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2224 } else if (strcmp(descriptor, 2225 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2226 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2227 } else if (strcmp(descriptor, "[C") == 0) { 2228 new_class.Assign(GetClassRoot(kCharArrayClass)); 2229 } else if (strcmp(descriptor, "[I") == 0) { 2230 new_class.Assign(GetClassRoot(kIntArrayClass)); 2231 } 2232 } 2233 if (new_class.Get() == nullptr) { 2234 new_class.Assign(AllocClass(self, sizeof(mirror::Class))); 2235 if (new_class.Get() == nullptr) { 2236 return nullptr; 2237 } 2238 new_class->SetComponentType(component_type.Get()); 2239 } 2240 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2241 DCHECK(new_class->GetComponentType() != NULL); 2242 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2243 new_class->SetSuperClass(java_lang_Object); 2244 new_class->SetVTable(java_lang_Object->GetVTable()); 2245 new_class->SetPrimitiveType(Primitive::kPrimNot); 2246 new_class->SetClassLoader(component_type->GetClassLoader()); 2247 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2248 // don't need to set new_class->SetObjectSize(..) 2249 // because Object::SizeOf delegates to Array::SizeOf 2250 2251 2252 // All arrays have java/lang/Cloneable and java/io/Serializable as 2253 // interfaces. We need to set that up here, so that stuff like 2254 // "instanceof" works right. 2255 // 2256 // Note: The GC could run during the call to FindSystemClass, 2257 // so we need to make sure the class object is GC-valid while we're in 2258 // there. Do this by clearing the interface list so the GC will just 2259 // think that the entries are null. 2260 2261 2262 // Use the single, global copies of "interfaces" and "iftable" 2263 // (remember not to free them for arrays). 2264 CHECK(array_iftable_ != nullptr); 2265 new_class->SetIfTable(array_iftable_); 2266 2267 // Inherit access flags from the component type. 2268 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2269 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2270 access_flags &= kAccJavaFlagsMask; 2271 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2272 // and remove "interface". 2273 access_flags |= kAccAbstract | kAccFinal; 2274 access_flags &= ~kAccInterface; 2275 2276 new_class->SetAccessFlags(access_flags); 2277 2278 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2279 if (existing == nullptr) { 2280 return new_class.Get(); 2281 } 2282 // Another thread must have loaded the class after we 2283 // started but before we finished. Abandon what we've 2284 // done. 2285 // 2286 // (Yes, this happens.) 2287 2288 return existing; 2289} 2290 2291mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2292 switch (type) { 2293 case 'B': 2294 return GetClassRoot(kPrimitiveByte); 2295 case 'C': 2296 return GetClassRoot(kPrimitiveChar); 2297 case 'D': 2298 return GetClassRoot(kPrimitiveDouble); 2299 case 'F': 2300 return GetClassRoot(kPrimitiveFloat); 2301 case 'I': 2302 return GetClassRoot(kPrimitiveInt); 2303 case 'J': 2304 return GetClassRoot(kPrimitiveLong); 2305 case 'S': 2306 return GetClassRoot(kPrimitiveShort); 2307 case 'Z': 2308 return GetClassRoot(kPrimitiveBoolean); 2309 case 'V': 2310 return GetClassRoot(kPrimitiveVoid); 2311 default: 2312 break; 2313 } 2314 std::string printable_type(PrintableChar(type)); 2315 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2316 return NULL; 2317} 2318 2319mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2320 size_t hash) { 2321 if (VLOG_IS_ON(class_linker)) { 2322 mirror::DexCache* dex_cache = klass->GetDexCache(); 2323 std::string source; 2324 if (dex_cache != NULL) { 2325 source += " from "; 2326 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2327 } 2328 LOG(INFO) << "Loaded class " << descriptor << source; 2329 } 2330 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2331 mirror::Class* existing = 2332 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2333 if (existing != NULL) { 2334 return existing; 2335 } 2336 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2337 // Check a class loaded with the system class loader matches one in the image if the class 2338 // is in the image. 2339 existing = LookupClassFromImage(descriptor); 2340 if (existing != NULL) { 2341 CHECK(klass == existing); 2342 } 2343 } 2344 VerifyObject(klass); 2345 class_table_.insert(std::make_pair(hash, klass)); 2346 if (log_new_class_table_roots_) { 2347 new_class_roots_.push_back(std::make_pair(hash, klass)); 2348 } 2349 return NULL; 2350} 2351 2352bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2353 size_t hash = Hash(descriptor); 2354 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2355 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2356 it != end && it->first == hash; 2357 ++it) { 2358 mirror::Class** root = &it->second; 2359 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2360 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2361 class_table_.erase(it); 2362 return true; 2363 } 2364 } 2365 return false; 2366} 2367 2368mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2369 const mirror::ClassLoader* class_loader) { 2370 size_t hash = Hash(descriptor); 2371 { 2372 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2373 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2374 if (result != NULL) { 2375 return result; 2376 } 2377 } 2378 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2379 return NULL; 2380 } else { 2381 // Lookup failed but need to search dex_caches_. 2382 mirror::Class* result = LookupClassFromImage(descriptor); 2383 if (result != NULL) { 2384 InsertClass(descriptor, result, hash); 2385 } else { 2386 // Searching the image dex files/caches failed, we don't want to get into this situation 2387 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2388 // classes into the class table. 2389 const int32_t kMaxFailedDexCacheLookups = 1000; 2390 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2391 MoveImageClassesToClassTable(); 2392 } 2393 } 2394 return result; 2395 } 2396} 2397 2398mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2399 const mirror::ClassLoader* class_loader, 2400 size_t hash) { 2401 auto end = class_table_.end(); 2402 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2403 mirror::Class** root = &it->second; 2404 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2405 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2406 if (kIsDebugBuild) { 2407 // Check for duplicates in the table. 2408 for (++it; it != end && it->first == hash; ++it) { 2409 mirror::Class** root2 = &it->second; 2410 mirror::Class* klass2 = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root2); 2411 CHECK(!(klass2->GetClassLoader() == class_loader && 2412 klass2->DescriptorEquals(descriptor))) 2413 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2414 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2415 } 2416 } 2417 return klass; 2418 } 2419 } 2420 return NULL; 2421} 2422 2423static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2424 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2425 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2426 CHECK(image != NULL); 2427 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2428 return root->AsObjectArray<mirror::DexCache>(); 2429} 2430 2431void ClassLinker::MoveImageClassesToClassTable() { 2432 Thread* self = Thread::Current(); 2433 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2434 if (!dex_cache_image_class_lookup_required_) { 2435 return; // All dex cache classes are already in the class table. 2436 } 2437 const char* old_no_suspend_cause = 2438 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2439 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2440 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2441 mirror::DexCache* dex_cache = dex_caches->Get(i); 2442 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2443 for (int32_t j = 0; j < types->GetLength(); j++) { 2444 mirror::Class* klass = types->Get(j); 2445 if (klass != NULL) { 2446 DCHECK(klass->GetClassLoader() == NULL); 2447 std::string descriptor = klass->GetDescriptor(); 2448 size_t hash = Hash(descriptor.c_str()); 2449 mirror::Class* existing = LookupClassFromTableLocked(descriptor.c_str(), NULL, hash); 2450 if (existing != NULL) { 2451 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2452 << PrettyClassAndClassLoader(klass); 2453 } else { 2454 class_table_.insert(std::make_pair(hash, klass)); 2455 if (log_new_class_table_roots_) { 2456 new_class_roots_.push_back(std::make_pair(hash, klass)); 2457 } 2458 } 2459 } 2460 } 2461 } 2462 dex_cache_image_class_lookup_required_ = false; 2463 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2464} 2465 2466mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2467 Thread* self = Thread::Current(); 2468 const char* old_no_suspend_cause = 2469 self->StartAssertNoThreadSuspension("Image class lookup"); 2470 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2471 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2472 mirror::DexCache* dex_cache = dex_caches->Get(i); 2473 const DexFile* dex_file = dex_cache->GetDexFile(); 2474 // Try binary searching the string/type index. 2475 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2476 if (string_id != NULL) { 2477 const DexFile::TypeId* type_id = 2478 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2479 if (type_id != NULL) { 2480 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2481 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2482 if (klass != NULL) { 2483 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2484 return klass; 2485 } 2486 } 2487 } 2488 } 2489 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2490 return NULL; 2491} 2492 2493void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2494 result.clear(); 2495 if (dex_cache_image_class_lookup_required_) { 2496 MoveImageClassesToClassTable(); 2497 } 2498 size_t hash = Hash(descriptor); 2499 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2500 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2501 it != end && it->first == hash; ++it) { 2502 mirror::Class** root = &it->second; 2503 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2504 if (klass->DescriptorEquals(descriptor)) { 2505 result.push_back(klass); 2506 } 2507 } 2508} 2509 2510void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 2511 // TODO: assert that the monitor on the Class is held 2512 Thread* self = Thread::Current(); 2513 ObjectLock<mirror::Class> lock(self, klass); 2514 2515 // Don't attempt to re-verify if already sufficiently verified. 2516 if (klass->IsVerified() || 2517 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2518 return; 2519 } 2520 2521 // The class might already be erroneous, for example at compile time if we attempted to verify 2522 // this class as a parent to another. 2523 if (klass->IsErroneous()) { 2524 ThrowEarlierClassFailure(klass.Get()); 2525 return; 2526 } 2527 2528 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2529 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2530 } else { 2531 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2532 << PrettyClass(klass.Get()); 2533 CHECK(!Runtime::Current()->IsCompiler()); 2534 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2535 } 2536 2537 // Skip verification if disabled. 2538 if (!Runtime::Current()->IsVerificationEnabled()) { 2539 klass->SetStatus(mirror::Class::kStatusVerified, self); 2540 return; 2541 } 2542 2543 // Verify super class. 2544 StackHandleScope<2> hs(self); 2545 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 2546 if (super.Get() != NULL) { 2547 // Acquire lock to prevent races on verifying the super class. 2548 ObjectLock<mirror::Class> lock(self, super); 2549 2550 if (!super->IsVerified() && !super->IsErroneous()) { 2551 VerifyClass(super); 2552 } 2553 if (!super->IsCompileTimeVerified()) { 2554 std::string error_msg( 2555 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2556 PrettyDescriptor(klass.Get()).c_str(), 2557 PrettyDescriptor(super.Get()).c_str())); 2558 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2559 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 2560 if (cause.Get() != nullptr) { 2561 self->ClearException(); 2562 } 2563 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2564 if (cause.Get() != nullptr) { 2565 self->GetException(nullptr)->SetCause(cause.Get()); 2566 } 2567 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2568 if (Runtime::Current()->IsCompiler()) { 2569 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2570 } 2571 klass->SetStatus(mirror::Class::kStatusError, self); 2572 return; 2573 } 2574 } 2575 2576 // Try to use verification information from the oat file, otherwise do runtime verification. 2577 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2578 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2579 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 2580 if (oat_file_class_status == mirror::Class::kStatusError) { 2581 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2582 << PrettyDescriptor(klass.Get()) << " in " 2583 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2584 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 2585 PrettyDescriptor(klass.Get()).c_str()); 2586 klass->SetStatus(mirror::Class::kStatusError, self); 2587 return; 2588 } 2589 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2590 std::string error_msg; 2591 if (!preverified) { 2592 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 2593 Runtime::Current()->IsCompiler(), 2594 &error_msg); 2595 } 2596 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2597 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2598 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 2599 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2600 << " because: " << error_msg; 2601 } 2602 self->AssertNoPendingException(); 2603 // Make sure all classes referenced by catch blocks are resolved. 2604 ResolveClassExceptionHandlerTypes(dex_file, klass); 2605 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2606 // Even though there were no verifier failures we need to respect whether the super-class 2607 // was verified or requiring runtime reverification. 2608 if (super.Get() == NULL || super->IsVerified()) { 2609 klass->SetStatus(mirror::Class::kStatusVerified, self); 2610 } else { 2611 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2612 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2613 // Pretend a soft failure occured so that we don't consider the class verified below. 2614 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2615 } 2616 } else { 2617 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2618 // Soft failures at compile time should be retried at runtime. Soft 2619 // failures at runtime will be handled by slow paths in the generated 2620 // code. Set status accordingly. 2621 if (Runtime::Current()->IsCompiler()) { 2622 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2623 } else { 2624 klass->SetStatus(mirror::Class::kStatusVerified, self); 2625 } 2626 } 2627 } else { 2628 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 2629 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2630 << " because: " << error_msg; 2631 self->AssertNoPendingException(); 2632 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2633 klass->SetStatus(mirror::Class::kStatusError, self); 2634 } 2635 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2636 // Class is verified so we don't need to do any access check on its methods. 2637 // Let the interpreter know it by setting the kAccPreverified flag onto each 2638 // method. 2639 // Note: we're going here during compilation and at runtime. When we set the 2640 // kAccPreverified flag when compiling image classes, the flag is recorded 2641 // in the image and is set when loading the image. 2642 klass->SetPreverifiedFlagOnAllMethods(); 2643 } 2644} 2645 2646bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2647 mirror::Class::Status& oat_file_class_status) { 2648 // If we're compiling, we can only verify the class using the oat file if 2649 // we are not compiling the image or if the class we're verifying is not part of 2650 // the app. In other words, we will only check for preverification of bootclasspath 2651 // classes. 2652 if (Runtime::Current()->IsCompiler()) { 2653 // Are we compiling the bootclasspath? 2654 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2655 return false; 2656 } 2657 // We are compiling an app (not the image). 2658 2659 // Is this an app class? (I.e. not a bootclasspath class) 2660 if (klass->GetClassLoader() != NULL) { 2661 return false; 2662 } 2663 } 2664 2665 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2666 // Make this work with gtests, which do not set up the image properly. 2667 // TODO: we should clean up gtests to set up the image path properly. 2668 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2669 return false; 2670 } 2671 2672 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2673 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2674 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2675 &dex_location_checksum); 2676 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2677 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2678 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 2679 if (oat_file_class_status == mirror::Class::kStatusVerified || 2680 oat_file_class_status == mirror::Class::kStatusInitialized) { 2681 return true; 2682 } 2683 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2684 // Compile time verification failed with a soft error. Compile time verification can fail 2685 // because we have incomplete type information. Consider the following: 2686 // class ... { 2687 // Foo x; 2688 // .... () { 2689 // if (...) { 2690 // v1 gets assigned a type of resolved class Foo 2691 // } else { 2692 // v1 gets assigned a type of unresolved class Bar 2693 // } 2694 // iput x = v1 2695 // } } 2696 // when we merge v1 following the if-the-else it results in Conflict 2697 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2698 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2699 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2700 // at compile time). 2701 return false; 2702 } 2703 if (oat_file_class_status == mirror::Class::kStatusError) { 2704 // Compile time verification failed with a hard error. This is caused by invalid instructions 2705 // in the class. These errors are unrecoverable. 2706 return false; 2707 } 2708 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2709 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2710 // not loading the class. 2711 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2712 // isn't a problem and this case shouldn't occur 2713 return false; 2714 } 2715 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2716 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2717 << klass->GetDescriptor(); 2718 2719 return false; 2720} 2721 2722void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2723 Handle<mirror::Class> klass) { 2724 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2725 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2726 } 2727 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2728 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2729 } 2730} 2731 2732void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2733 mirror::ArtMethod* method) { 2734 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2735 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2736 if (code_item == NULL) { 2737 return; // native or abstract method 2738 } 2739 if (code_item->tries_size_ == 0) { 2740 return; // nothing to process 2741 } 2742 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2743 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2744 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2745 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2746 CatchHandlerIterator iterator(handlers_ptr); 2747 for (; iterator.HasNext(); iterator.Next()) { 2748 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2749 // unresolved exception types will be ignored by exception delivery 2750 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2751 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2752 if (exception_type == NULL) { 2753 DCHECK(Thread::Current()->IsExceptionPending()); 2754 Thread::Current()->ClearException(); 2755 } 2756 } 2757 } 2758 handlers_ptr = iterator.EndDataPointer(); 2759 } 2760} 2761 2762static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2763static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 2764 Handle<mirror::ArtMethod> prototype); 2765 2766mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 2767 jobjectArray interfaces, jobject loader, 2768 jobjectArray methods, jobjectArray throws) { 2769 Thread* self = soa.Self(); 2770 StackHandleScope<8> hs(self); 2771 Handle<mirror::Class> klass(hs.NewHandle(AllocClass(self, GetClassRoot(kJavaLangClass), 2772 sizeof(mirror::SynthesizedProxyClass)))); 2773 if (klass.Get() == NULL) { 2774 CHECK(self->IsExceptionPending()); // OOME. 2775 return NULL; 2776 } 2777 DCHECK(klass->GetClass() != NULL); 2778 klass->SetObjectSize(sizeof(mirror::Proxy)); 2779 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2780 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2781 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2782 klass->SetName(soa.Decode<mirror::String*>(name)); 2783 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2784 klass->SetDexCache(proxy_class->GetDexCache()); 2785 klass->SetStatus(mirror::Class::kStatusIdx, self); 2786 2787 // Instance fields are inherited, but we add a couple of static fields... 2788 { 2789 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2790 if (UNLIKELY(sfields == NULL)) { 2791 CHECK(self->IsExceptionPending()); // OOME. 2792 return NULL; 2793 } 2794 klass->SetSFields(sfields); 2795 } 2796 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2797 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2798 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 2799 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 2800 CHECK(self->IsExceptionPending()); // OOME. 2801 return nullptr; 2802 } 2803 klass->SetStaticField(0, interfaces_sfield.Get()); 2804 interfaces_sfield->SetDexFieldIndex(0); 2805 interfaces_sfield->SetDeclaringClass(klass.Get()); 2806 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2807 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2808 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 2809 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 2810 CHECK(self->IsExceptionPending()); // OOME. 2811 return nullptr; 2812 } 2813 klass->SetStaticField(1, throws_sfield.Get()); 2814 throws_sfield->SetDexFieldIndex(1); 2815 throws_sfield->SetDeclaringClass(klass.Get()); 2816 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2817 2818 // Proxies have 1 direct method, the constructor 2819 { 2820 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 2821 if (UNLIKELY(directs == nullptr)) { 2822 CHECK(self->IsExceptionPending()); // OOME. 2823 return nullptr; 2824 } 2825 klass->SetDirectMethods(directs); 2826 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2827 if (UNLIKELY(constructor == nullptr)) { 2828 CHECK(self->IsExceptionPending()); // OOME. 2829 return nullptr; 2830 } 2831 klass->SetDirectMethod(0, constructor); 2832 } 2833 2834 // Create virtual method using specified prototypes. 2835 size_t num_virtual_methods = 2836 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 2837 { 2838 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 2839 num_virtual_methods); 2840 if (UNLIKELY(virtuals == NULL)) { 2841 CHECK(self->IsExceptionPending()); // OOME. 2842 return NULL; 2843 } 2844 klass->SetVirtualMethods(virtuals); 2845 } 2846 for (size_t i = 0; i < num_virtual_methods; ++i) { 2847 StackHandleScope<1> hs(self); 2848 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2849 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2850 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 2851 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2852 if (UNLIKELY(clone == nullptr)) { 2853 CHECK(self->IsExceptionPending()); // OOME. 2854 return nullptr; 2855 } 2856 klass->SetVirtualMethod(i, clone); 2857 } 2858 2859 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2860 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 2861 self->AssertNoPendingException(); 2862 2863 { 2864 ObjectLock<mirror::Class> lock(self, klass); // Must hold lock on object when resolved. 2865 // Link the fields and virtual methods, creating vtable and iftables 2866 Handle<mirror::ObjectArray<mirror::Class>> h_interfaces( 2867 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 2868 if (!LinkClass(self, klass, h_interfaces)) { 2869 klass->SetStatus(mirror::Class::kStatusError, self); 2870 return nullptr; 2871 } 2872 2873 interfaces_sfield->SetObject<false>( 2874 klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2875 throws_sfield->SetObject<false>( 2876 klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 2877 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2878 } 2879 2880 // sanity checks 2881 if (kIsDebugBuild) { 2882 CHECK(klass->GetIFields() == nullptr); 2883 CheckProxyConstructor(klass->GetDirectMethod(0)); 2884 for (size_t i = 0; i < num_virtual_methods; ++i) { 2885 StackHandleScope<2> hs(self); 2886 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2887 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2888 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 2889 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 2890 CheckProxyMethod(virtual_method, prototype); 2891 } 2892 2893 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 2894 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2895 decoded_name->ToModifiedUtf8().c_str())); 2896 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2897 2898 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2899 decoded_name->ToModifiedUtf8().c_str())); 2900 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2901 2902 mirror::SynthesizedProxyClass* synth_proxy_class = 2903 down_cast<mirror::SynthesizedProxyClass*>(klass.Get()); 2904 CHECK_EQ(synth_proxy_class->GetInterfaces(), 2905 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2906 CHECK_EQ(synth_proxy_class->GetThrows(), 2907 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 2908 } 2909 std::string descriptor(GetDescriptorForProxy(klass.Get())); 2910 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 2911 CHECK(existing == nullptr); 2912 return klass.Get(); 2913} 2914 2915std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 2916 DCHECK(proxy_class->IsProxyClass()); 2917 mirror::String* name = proxy_class->GetName(); 2918 DCHECK(name != NULL); 2919 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2920} 2921 2922mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 2923 mirror::ArtMethod* proxy_method) { 2924 DCHECK(proxy_class->IsProxyClass()); 2925 DCHECK(proxy_method->IsProxyMethod()); 2926 // Locate the dex cache of the original interface/Object 2927 mirror::DexCache* dex_cache = NULL; 2928 { 2929 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2930 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2931 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2932 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2933 dex_cache = dex_caches_[i]; 2934 break; 2935 } 2936 } 2937 } 2938 CHECK(dex_cache != NULL); 2939 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2940 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2941 CHECK(resolved_method != NULL); 2942 return resolved_method; 2943} 2944 2945 2946mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2947 Handle<mirror::Class> klass, 2948 mirror::Class* proxy_class) { 2949 // Create constructor for Proxy that must initialize h 2950 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2951 proxy_class->GetDirectMethods(); 2952 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2953 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2954 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2955 // code_ too) 2956 mirror::ArtMethod* constructor = 2957 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2958 if (constructor == NULL) { 2959 CHECK(self->IsExceptionPending()); // OOME. 2960 return NULL; 2961 } 2962 // Make this constructor public and fix the class to be our Proxy version 2963 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2964 constructor->SetDeclaringClass(klass.Get()); 2965 return constructor; 2966} 2967 2968static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2969 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2970 CHECK(constructor->IsConstructor()); 2971 CHECK_STREQ(constructor->GetName(), "<init>"); 2972 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 2973 "(Ljava/lang/reflect/InvocationHandler;)V"); 2974 DCHECK(constructor->IsPublic()); 2975} 2976 2977mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 2978 Handle<mirror::Class> klass, 2979 Handle<mirror::ArtMethod> prototype) { 2980 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2981 // prototype method 2982 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2983 prototype.Get()); 2984 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2985 // as necessary 2986 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 2987 if (UNLIKELY(method == NULL)) { 2988 CHECK(self->IsExceptionPending()); // OOME. 2989 return NULL; 2990 } 2991 2992 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 2993 // the intersection of throw exceptions as defined in Proxy 2994 method->SetDeclaringClass(klass.Get()); 2995 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 2996 2997 // At runtime the method looks like a reference and argument saving method, clone the code 2998 // related parameters from this method. 2999 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3000 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3001 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3002 3003 return method; 3004} 3005 3006static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3007 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3008 // Basic sanity 3009 CHECK(!prototype->IsFinal()); 3010 CHECK(method->IsFinal()); 3011 CHECK(!method->IsAbstract()); 3012 3013 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3014 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3015 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3016 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 3017 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 3018 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3019 3020 MethodHelper mh(method); 3021 MethodHelper mh2(prototype); 3022 CHECK_STREQ(method->GetName(), prototype->GetName()); 3023 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3024 // More complex sanity - via dex cache 3025 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3026} 3027 3028static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3029 bool can_init_parents) 3030 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3031 if (can_init_statics && can_init_parents) { 3032 return true; 3033 } 3034 if (!can_init_statics) { 3035 // Check if there's a class initializer. 3036 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3037 if (clinit != NULL) { 3038 return false; 3039 } 3040 // Check if there are encoded static values needing initialization. 3041 if (klass->NumStaticFields() != 0) { 3042 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3043 DCHECK(dex_class_def != NULL); 3044 if (dex_class_def->static_values_off_ != 0) { 3045 return false; 3046 } 3047 } 3048 } 3049 if (!klass->IsInterface() && klass->HasSuperClass()) { 3050 mirror::Class* super_class = klass->GetSuperClass(); 3051 if (!can_init_parents && !super_class->IsInitialized()) { 3052 return false; 3053 } else { 3054 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3055 return false; 3056 } 3057 } 3058 } 3059 return true; 3060} 3061 3062bool ClassLinker::IsInitialized() const { 3063 return init_done_; 3064} 3065 3066bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3067 bool can_init_parents) { 3068 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3069 3070 // Are we already initialized and therefore done? 3071 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3072 // an initialized class will never change its state. 3073 if (klass->IsInitialized()) { 3074 return true; 3075 } 3076 3077 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3078 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3079 return false; 3080 } 3081 3082 Thread* self = Thread::Current(); 3083 uint64_t t0; 3084 { 3085 ObjectLock<mirror::Class> lock(self, klass); 3086 3087 // Re-check under the lock in case another thread initialized ahead of us. 3088 if (klass->IsInitialized()) { 3089 return true; 3090 } 3091 3092 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3093 if (klass->IsErroneous()) { 3094 ThrowEarlierClassFailure(klass.Get()); 3095 return false; 3096 } 3097 3098 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3099 3100 if (!klass->IsVerified()) { 3101 VerifyClass(klass); 3102 if (!klass->IsVerified()) { 3103 // We failed to verify, expect either the klass to be erroneous or verification failed at 3104 // compile time. 3105 if (klass->IsErroneous()) { 3106 CHECK(self->IsExceptionPending()); 3107 } else { 3108 CHECK(Runtime::Current()->IsCompiler()); 3109 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3110 } 3111 return false; 3112 } 3113 } 3114 3115 // If the class is kStatusInitializing, either this thread is 3116 // initializing higher up the stack or another thread has beat us 3117 // to initializing and we need to wait. Either way, this 3118 // invocation of InitializeClass will not be responsible for 3119 // running <clinit> and will return. 3120 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3121 // We caught somebody else in the act; was it us? 3122 if (klass->GetClinitThreadId() == self->GetTid()) { 3123 // Yes. That's fine. Return so we can continue initializing. 3124 return true; 3125 } 3126 // No. That's fine. Wait for another thread to finish initializing. 3127 return WaitForInitializeClass(klass, self, lock); 3128 } 3129 3130 if (!ValidateSuperClassDescriptors(klass)) { 3131 klass->SetStatus(mirror::Class::kStatusError, self); 3132 return false; 3133 } 3134 3135 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3136 3137 // From here out other threads may observe that we're initializing and so changes of state 3138 // require the a notification. 3139 klass->SetClinitThreadId(self->GetTid()); 3140 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3141 3142 t0 = NanoTime(); 3143 } 3144 3145 // Initialize super classes, must be done while initializing for the JLS. 3146 if (!klass->IsInterface() && klass->HasSuperClass()) { 3147 mirror::Class* super_class = klass->GetSuperClass(); 3148 if (!super_class->IsInitialized()) { 3149 CHECK(!super_class->IsInterface()); 3150 CHECK(can_init_parents); 3151 StackHandleScope<1> hs(self); 3152 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3153 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3154 if (!super_initialized) { 3155 // The super class was verified ahead of entering initializing, we should only be here if 3156 // the super class became erroneous due to initialization. 3157 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3158 << "Super class initialization failed for " 3159 << PrettyDescriptor(handle_scope_super.Get()) 3160 << " that has unexpected status " << handle_scope_super->GetStatus() 3161 << "\nPending exception:\n" 3162 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3163 ObjectLock<mirror::Class> lock(self, klass); 3164 // Initialization failed because the super-class is erroneous. 3165 klass->SetStatus(mirror::Class::kStatusError, self); 3166 return false; 3167 } 3168 } 3169 } 3170 3171 if (klass->NumStaticFields() > 0) { 3172 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3173 CHECK(dex_class_def != NULL); 3174 const DexFile& dex_file = klass->GetDexFile(); 3175 StackHandleScope<2> hs(self); 3176 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3177 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3178 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3179 this, *dex_class_def); 3180 if (it.HasNext()) { 3181 CHECK(can_init_statics); 3182 // We reordered the fields, so we need to be able to map the 3183 // field indexes to the right fields. 3184 SafeMap<uint32_t, mirror::ArtField*> field_map; 3185 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3186 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3187 if (Runtime::Current()->IsActiveTransaction()) { 3188 it.ReadValueToField<true>(field_map.Get(i)); 3189 } else { 3190 it.ReadValueToField<false>(field_map.Get(i)); 3191 } 3192 } 3193 } 3194 } 3195 3196 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3197 if (clinit != NULL) { 3198 CHECK(can_init_statics); 3199 JValue result; 3200 clinit->Invoke(self, NULL, 0, &result, "V"); 3201 } 3202 3203 uint64_t t1 = NanoTime(); 3204 3205 bool success = true; 3206 { 3207 ObjectLock<mirror::Class> lock(self, klass); 3208 3209 if (self->IsExceptionPending()) { 3210 WrapExceptionInInitializer(); 3211 klass->SetStatus(mirror::Class::kStatusError, self); 3212 success = false; 3213 } else { 3214 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3215 RuntimeStats* thread_stats = self->GetStats(); 3216 ++global_stats->class_init_count; 3217 ++thread_stats->class_init_count; 3218 global_stats->class_init_time_ns += (t1 - t0); 3219 thread_stats->class_init_time_ns += (t1 - t0); 3220 // Set the class as initialized except if failed to initialize static fields. 3221 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3222 if (VLOG_IS_ON(class_linker)) { 3223 LOG(INFO) << "Initialized class " << klass->GetDescriptor() << " from " << 3224 klass->GetLocation(); 3225 } 3226 // Opportunistically set static method trampolines to their destination. 3227 FixupStaticTrampolines(klass.Get()); 3228 } 3229 } 3230 return success; 3231} 3232 3233bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3234 ObjectLock<mirror::Class>& lock) 3235 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3236 while (true) { 3237 self->AssertNoPendingException(); 3238 CHECK(!klass->IsInitialized()); 3239 lock.WaitIgnoringInterrupts(); 3240 3241 // When we wake up, repeat the test for init-in-progress. If 3242 // there's an exception pending (only possible if 3243 // "interruptShouldThrow" was set), bail out. 3244 if (self->IsExceptionPending()) { 3245 WrapExceptionInInitializer(); 3246 klass->SetStatus(mirror::Class::kStatusError, self); 3247 return false; 3248 } 3249 // Spurious wakeup? Go back to waiting. 3250 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3251 continue; 3252 } 3253 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3254 // Compile time initialization failed. 3255 return false; 3256 } 3257 if (klass->IsErroneous()) { 3258 // The caller wants an exception, but it was thrown in a 3259 // different thread. Synthesize one here. 3260 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3261 PrettyDescriptor(klass.Get()).c_str()); 3262 return false; 3263 } 3264 if (klass->IsInitialized()) { 3265 return true; 3266 } 3267 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 3268 << klass->GetStatus(); 3269 } 3270 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 3271} 3272 3273bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 3274 if (klass->IsInterface()) { 3275 return true; 3276 } 3277 // Begin with the methods local to the superclass. 3278 StackHandleScope<2> hs(Thread::Current()); 3279 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3280 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3281 if (klass->HasSuperClass() && 3282 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3283 for (int i = klass->GetSuperClass()->GetVTable()->GetLength() - 1; i >= 0; --i) { 3284 mh.ChangeMethod(klass->GetVTable()->GetWithoutChecks(i)); 3285 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTable()->GetWithoutChecks(i)); 3286 if (mh.GetMethod() != super_mh.GetMethod() && 3287 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3288 ThrowLinkageError(klass.Get(), 3289 "Class %s method %s resolves differently in superclass %s", 3290 PrettyDescriptor(klass.Get()).c_str(), 3291 PrettyMethod(mh.GetMethod()).c_str(), 3292 PrettyDescriptor(klass->GetSuperClass()).c_str()); 3293 return false; 3294 } 3295 } 3296 } 3297 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3298 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 3299 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 3300 for (uint32_t j = 0; j < num_methods; ++j) { 3301 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 3302 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 3303 if (mh.GetMethod() != super_mh.GetMethod() && 3304 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3305 ThrowLinkageError(klass.Get(), 3306 "Class %s method %s resolves differently in interface %s", 3307 PrettyDescriptor(klass.Get()).c_str(), 3308 PrettyMethod(mh.GetMethod()).c_str(), 3309 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 3310 return false; 3311 } 3312 } 3313 } 3314 } 3315 return true; 3316} 3317 3318bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 3319 bool can_init_parents) { 3320 DCHECK(c.Get() != nullptr); 3321 const bool success = c->IsInitialized() || InitializeClass(c, can_init_fields, can_init_parents); 3322 if (!success && can_init_fields && can_init_parents) { 3323 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.Get()); 3324 } 3325 return success; 3326} 3327 3328void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3329 mirror::Class* c, 3330 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3331 const byte* class_data = dex_file.GetClassData(dex_class_def); 3332 ClassDataItemIterator it(dex_file, class_data); 3333 StackHandleScope<2> hs(Thread::Current()); 3334 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 3335 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 3336 CHECK(!kMovingFields); 3337 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3338 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3339 } 3340} 3341 3342bool ClassLinker::LinkClass(Thread* self, Handle<mirror::Class> klass, 3343 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3344 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3345 if (!LinkSuperClass(klass)) { 3346 return false; 3347 } 3348 if (!LinkMethods(self, klass, interfaces)) { 3349 return false; 3350 } 3351 if (!LinkInstanceFields(klass)) { 3352 return false; 3353 } 3354 if (!LinkStaticFields(klass)) { 3355 return false; 3356 } 3357 CreateReferenceInstanceOffsets(klass); 3358 CreateReferenceStaticOffsets(klass); 3359 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3360 klass->SetStatus(mirror::Class::kStatusResolved, self); 3361 return true; 3362} 3363 3364bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 3365 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3366 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3367 uint16_t super_class_idx = class_def.superclass_idx_; 3368 if (super_class_idx != DexFile::kDexNoIndex16) { 3369 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 3370 if (super_class == NULL) { 3371 DCHECK(Thread::Current()->IsExceptionPending()); 3372 return false; 3373 } 3374 // Verify 3375 if (!klass->CanAccess(super_class)) { 3376 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 3377 PrettyDescriptor(super_class).c_str(), 3378 PrettyDescriptor(klass.Get()).c_str()); 3379 return false; 3380 } 3381 klass->SetSuperClass(super_class); 3382 } 3383 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3384 if (interfaces != NULL) { 3385 for (size_t i = 0; i < interfaces->Size(); i++) { 3386 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3387 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 3388 if (interface == NULL) { 3389 DCHECK(Thread::Current()->IsExceptionPending()); 3390 return false; 3391 } 3392 // Verify 3393 if (!klass->CanAccess(interface)) { 3394 // TODO: the RI seemed to ignore this in my testing. 3395 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 3396 PrettyDescriptor(interface).c_str(), 3397 PrettyDescriptor(klass.Get()).c_str()); 3398 return false; 3399 } 3400 } 3401 } 3402 // Mark the class as loaded. 3403 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3404 return true; 3405} 3406 3407bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 3408 CHECK(!klass->IsPrimitive()); 3409 mirror::Class* super = klass->GetSuperClass(); 3410 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 3411 if (super != NULL) { 3412 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 3413 return false; 3414 } 3415 return true; 3416 } 3417 if (super == NULL) { 3418 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 3419 PrettyDescriptor(klass.Get()).c_str()); 3420 return false; 3421 } 3422 // Verify 3423 if (super->IsFinal() || super->IsInterface()) { 3424 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 3425 PrettyDescriptor(super).c_str(), 3426 PrettyDescriptor(klass.Get()).c_str(), 3427 super->IsFinal() ? "declared final" : "an interface"); 3428 return false; 3429 } 3430 if (!klass->CanAccess(super)) { 3431 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 3432 PrettyDescriptor(super).c_str(), 3433 PrettyDescriptor(klass.Get()).c_str()); 3434 return false; 3435 } 3436 3437 // Inherit kAccClassIsFinalizable from the superclass in case this 3438 // class doesn't override finalize. 3439 if (super->IsFinalizable()) { 3440 klass->SetFinalizable(); 3441 } 3442 3443 // Inherit reference flags (if any) from the superclass. 3444 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3445 if (reference_flags != 0) { 3446 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3447 } 3448 // Disallow custom direct subclasses of java.lang.ref.Reference. 3449 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3450 ThrowLinkageError(klass.Get(), 3451 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3452 PrettyDescriptor(klass.Get()).c_str()); 3453 return false; 3454 } 3455 3456 if (kIsDebugBuild) { 3457 // Ensure super classes are fully resolved prior to resolving fields.. 3458 while (super != NULL) { 3459 CHECK(super->IsResolved()); 3460 super = super->GetSuperClass(); 3461 } 3462 } 3463 return true; 3464} 3465 3466// Populate the class vtable and itable. Compute return type indices. 3467bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 3468 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3469 if (klass->IsInterface()) { 3470 // No vtable. 3471 size_t count = klass->NumVirtualMethods(); 3472 if (!IsUint(16, count)) { 3473 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 3474 return false; 3475 } 3476 for (size_t i = 0; i < count; ++i) { 3477 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3478 } 3479 // Link interface method tables 3480 return LinkInterfaceMethods(klass, interfaces); 3481 } else { 3482 // Link virtual and interface method tables 3483 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 3484 } 3485 return true; 3486} 3487 3488bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 3489 if (klass->HasSuperClass()) { 3490 uint32_t max_count = klass->NumVirtualMethods() + 3491 klass->GetSuperClass()->GetVTable()->GetLength(); 3492 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3493 CHECK_LE(actual_count, max_count); 3494 // TODO: do not assign to the vtable field until it is fully constructed. 3495 StackHandleScope<3> hs(self); 3496 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3497 hs.NewHandle(klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count))); 3498 if (UNLIKELY(vtable.Get() == NULL)) { 3499 CHECK(self->IsExceptionPending()); // OOME. 3500 return false; 3501 } 3502 // See if any of our virtual methods override the superclass. 3503 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3504 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3505 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3506 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3507 local_mh.ChangeMethod(local_method); 3508 size_t j = 0; 3509 for (; j < actual_count; ++j) { 3510 mirror::ArtMethod* super_method = vtable->Get(j); 3511 super_mh.ChangeMethod(super_method); 3512 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3513 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 3514 super_method->GetAccessFlags())) { 3515 if (super_method->IsFinal()) { 3516 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 3517 PrettyMethod(local_method).c_str(), 3518 super_method->GetDeclaringClassDescriptor()); 3519 return false; 3520 } 3521 vtable->Set<false>(j, local_method); 3522 local_method->SetMethodIndex(j); 3523 break; 3524 } else { 3525 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3526 << " would have incorrectly overridden the package-private method in " 3527 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 3528 } 3529 } 3530 } 3531 if (j == actual_count) { 3532 // Not overriding, append. 3533 vtable->Set<false>(actual_count, local_method); 3534 local_method->SetMethodIndex(actual_count); 3535 actual_count += 1; 3536 } 3537 } 3538 if (!IsUint(16, actual_count)) { 3539 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 3540 return false; 3541 } 3542 // Shrink vtable if possible 3543 CHECK_LE(actual_count, max_count); 3544 if (actual_count < max_count) { 3545 vtable.Assign(vtable->CopyOf(self, actual_count)); 3546 if (UNLIKELY(vtable.Get() == NULL)) { 3547 CHECK(self->IsExceptionPending()); // OOME. 3548 return false; 3549 } 3550 } 3551 klass->SetVTable(vtable.Get()); 3552 } else { 3553 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 3554 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3555 if (!IsUint(16, num_virtual_methods)) { 3556 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 3557 return false; 3558 } 3559 StackHandleScope<1> hs(self); 3560 Handle<mirror::ObjectArray<mirror::ArtMethod>> 3561 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 3562 if (UNLIKELY(vtable.Get() == NULL)) { 3563 CHECK(self->IsExceptionPending()); // OOME. 3564 return false; 3565 } 3566 for (size_t i = 0; i < num_virtual_methods; ++i) { 3567 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3568 vtable->Set<false>(i, virtual_method); 3569 virtual_method->SetMethodIndex(i & 0xFFFF); 3570 } 3571 klass->SetVTable(vtable.Get()); 3572 } 3573 return true; 3574} 3575 3576bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 3577 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3578 Thread* const self = Thread::Current(); 3579 Runtime* const runtime = Runtime::Current(); 3580 // Set the imt table to be all conflicts by default. 3581 klass->SetImTable(runtime->GetDefaultImt()); 3582 size_t super_ifcount; 3583 if (klass->HasSuperClass()) { 3584 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3585 } else { 3586 super_ifcount = 0; 3587 } 3588 uint32_t num_interfaces = 3589 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 3590 size_t ifcount = super_ifcount + num_interfaces; 3591 for (size_t i = 0; i < num_interfaces; i++) { 3592 mirror::Class* interface = 3593 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 3594 interfaces->Get(i); 3595 ifcount += interface->GetIfTableCount(); 3596 } 3597 if (ifcount == 0) { 3598 // Class implements no interfaces. 3599 DCHECK_EQ(klass->GetIfTableCount(), 0); 3600 DCHECK(klass->GetIfTable() == NULL); 3601 return true; 3602 } 3603 if (ifcount == super_ifcount) { 3604 // Class implements same interfaces as parent, are any of these not marker interfaces? 3605 bool has_non_marker_interface = false; 3606 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3607 for (size_t i = 0; i < ifcount; ++i) { 3608 if (super_iftable->GetMethodArrayCount(i) > 0) { 3609 has_non_marker_interface = true; 3610 break; 3611 } 3612 } 3613 if (!has_non_marker_interface) { 3614 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3615 klass->SetIfTable(super_iftable); 3616 return true; 3617 } 3618 } 3619 StackHandleScope<4> hs(self); 3620 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 3621 if (UNLIKELY(iftable.Get() == NULL)) { 3622 CHECK(self->IsExceptionPending()); // OOME. 3623 return false; 3624 } 3625 if (super_ifcount != 0) { 3626 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3627 for (size_t i = 0; i < super_ifcount; i++) { 3628 mirror::Class* super_interface = super_iftable->GetInterface(i); 3629 iftable->SetInterface(i, super_interface); 3630 } 3631 } 3632 // Flatten the interface inheritance hierarchy. 3633 size_t idx = super_ifcount; 3634 for (size_t i = 0; i < num_interfaces; i++) { 3635 mirror::Class* interface = 3636 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 3637 interfaces->Get(i); 3638 DCHECK(interface != NULL); 3639 if (!interface->IsInterface()) { 3640 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 3641 PrettyDescriptor(klass.Get()).c_str(), 3642 PrettyDescriptor(interface->GetDescriptor()).c_str()); 3643 return false; 3644 } 3645 // Check if interface is already in iftable 3646 bool duplicate = false; 3647 for (size_t j = 0; j < idx; j++) { 3648 mirror::Class* existing_interface = iftable->GetInterface(j); 3649 if (existing_interface == interface) { 3650 duplicate = true; 3651 break; 3652 } 3653 } 3654 if (!duplicate) { 3655 // Add this non-duplicate interface. 3656 iftable->SetInterface(idx++, interface); 3657 // Add this interface's non-duplicate super-interfaces. 3658 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3659 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3660 bool super_duplicate = false; 3661 for (size_t k = 0; k < idx; k++) { 3662 mirror::Class* existing_interface = iftable->GetInterface(k); 3663 if (existing_interface == super_interface) { 3664 super_duplicate = true; 3665 break; 3666 } 3667 } 3668 if (!super_duplicate) { 3669 iftable->SetInterface(idx++, super_interface); 3670 } 3671 } 3672 } 3673 } 3674 // Shrink iftable in case duplicates were found 3675 if (idx < ifcount) { 3676 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3677 if (UNLIKELY(iftable.Get() == NULL)) { 3678 CHECK(self->IsExceptionPending()); // OOME. 3679 return false; 3680 } 3681 ifcount = idx; 3682 } else { 3683 CHECK_EQ(idx, ifcount); 3684 } 3685 klass->SetIfTable(iftable.Get()); 3686 3687 // If we're an interface, we don't need the vtable pointers, so we're done. 3688 if (klass->IsInterface()) { 3689 return true; 3690 } 3691 // Allocate imtable 3692 bool imtable_changed = false; 3693 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 3694 hs.NewHandle(AllocArtMethodArray(self, kImtSize))); 3695 if (UNLIKELY(imtable.Get() == NULL)) { 3696 CHECK(self->IsExceptionPending()); // OOME. 3697 return false; 3698 } 3699 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3700 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3701 std::vector<mirror::ArtMethod*> miranda_list; 3702 for (size_t i = 0; i < ifcount; ++i) { 3703 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 3704 if (num_methods > 0) { 3705 StackHandleScope<2> hs(self); 3706 Handle<mirror::ObjectArray<mirror::ArtMethod>> 3707 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 3708 if (UNLIKELY(method_array.Get() == nullptr)) { 3709 CHECK(self->IsExceptionPending()); // OOME. 3710 return false; 3711 } 3712 iftable->SetMethodArray(i, method_array.Get()); 3713 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3714 hs.NewHandle(klass->GetVTableDuringLinking())); 3715 for (size_t j = 0; j < num_methods; ++j) { 3716 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 3717 interface_mh.ChangeMethod(interface_method); 3718 int32_t k; 3719 // For each method listed in the interface's method list, find the 3720 // matching method in our class's method list. We want to favor the 3721 // subclass over the superclass, which just requires walking 3722 // back from the end of the vtable. (This only matters if the 3723 // superclass defines a private method and this class redefines 3724 // it -- otherwise it would use the same vtable slot. In .dex files 3725 // those don't end up in the virtual method table, so it shouldn't 3726 // matter which direction we go. We walk it backward anyway.) 3727 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3728 mirror::ArtMethod* vtable_method = vtable->Get(k); 3729 vtable_mh.ChangeMethod(vtable_method); 3730 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3731 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3732 ThrowIllegalAccessError( 3733 klass.Get(), 3734 "Method '%s' implementing interface method '%s' is not public", 3735 PrettyMethod(vtable_method).c_str(), 3736 PrettyMethod(interface_method).c_str()); 3737 return false; 3738 } 3739 method_array->Set<false>(j, vtable_method); 3740 // Place method in imt if entry is empty, place conflict otherwise. 3741 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3742 if (imtable->Get(imt_index) == NULL) { 3743 imtable->Set<false>(imt_index, vtable_method); 3744 imtable_changed = true; 3745 } else { 3746 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 3747 } 3748 break; 3749 } 3750 } 3751 if (k < 0) { 3752 StackHandleScope<1> hs(self); 3753 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 3754 for (mirror::ArtMethod* mir_method : miranda_list) { 3755 vtable_mh.ChangeMethod(mir_method); 3756 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3757 miranda_method.Assign(mir_method); 3758 break; 3759 } 3760 } 3761 if (miranda_method.Get() == NULL) { 3762 // Point the interface table at a phantom slot. 3763 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3764 if (UNLIKELY(miranda_method.Get() == NULL)) { 3765 CHECK(self->IsExceptionPending()); // OOME. 3766 return false; 3767 } 3768 // TODO: If a methods move then the miranda_list may hold stale references. 3769 miranda_list.push_back(miranda_method.Get()); 3770 } 3771 method_array->Set<false>(j, miranda_method.Get()); 3772 } 3773 } 3774 } 3775 } 3776 if (imtable_changed) { 3777 // Fill in empty entries in interface method table with conflict. 3778 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 3779 for (size_t i = 0; i < kImtSize; i++) { 3780 if (imtable->Get(i) == NULL) { 3781 imtable->Set<false>(i, imt_conflict_method); 3782 } 3783 } 3784 klass->SetImTable(imtable.Get()); 3785 } 3786 if (!miranda_list.empty()) { 3787 int old_method_count = klass->NumVirtualMethods(); 3788 int new_method_count = old_method_count + miranda_list.size(); 3789 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3790 if (old_method_count == 0) { 3791 virtuals = AllocArtMethodArray(self, new_method_count); 3792 } else { 3793 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3794 } 3795 if (UNLIKELY(virtuals == NULL)) { 3796 CHECK(self->IsExceptionPending()); // OOME. 3797 return false; 3798 } 3799 klass->SetVirtualMethods(virtuals); 3800 3801 StackHandleScope<1> hs(self); 3802 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3803 hs.NewHandle(klass->GetVTableDuringLinking())); 3804 CHECK(vtable.Get() != NULL); 3805 int old_vtable_count = vtable->GetLength(); 3806 int new_vtable_count = old_vtable_count + miranda_list.size(); 3807 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 3808 if (UNLIKELY(vtable.Get() == NULL)) { 3809 CHECK(self->IsExceptionPending()); // OOME. 3810 return false; 3811 } 3812 for (size_t i = 0; i < miranda_list.size(); ++i) { 3813 mirror::ArtMethod* method = miranda_list[i]; 3814 // Leave the declaring class alone as type indices are relative to it 3815 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3816 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3817 klass->SetVirtualMethod(old_method_count + i, method); 3818 vtable->Set<false>(old_vtable_count + i, method); 3819 } 3820 // TODO: do not assign to the vtable field until it is fully constructed. 3821 klass->SetVTable(vtable.Get()); 3822 } 3823 3824 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3825 for (int i = 0; i < vtable->GetLength(); ++i) { 3826 CHECK(vtable->Get(i) != NULL); 3827 } 3828 3829// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3830 3831 return true; 3832} 3833 3834bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 3835 CHECK(klass.Get() != NULL); 3836 return LinkFields(klass, false); 3837} 3838 3839bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass) { 3840 CHECK(klass.Get() != NULL); 3841 size_t allocated_class_size = klass->GetClassSize(); 3842 bool success = LinkFields(klass, true); 3843 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3844 return success; 3845} 3846 3847struct LinkFieldsComparator { 3848 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3849 } 3850 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3851 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 3852 NO_THREAD_SAFETY_ANALYSIS { 3853 // First come reference fields, then 64-bit, and finally 32-bit 3854 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 3855 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 3856 if (type1 != type2) { 3857 bool is_primitive1 = type1 != Primitive::kPrimNot; 3858 bool is_primitive2 = type2 != Primitive::kPrimNot; 3859 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 3860 type1 == Primitive::kPrimDouble); 3861 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 3862 type2 == Primitive::kPrimDouble); 3863 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 3864 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 3865 if (order1 != order2) { 3866 return order1 < order2; 3867 } 3868 } 3869 // same basic group? then sort by string. 3870 return strcmp(field1->GetName(), field2->GetName()) < 0; 3871 } 3872}; 3873 3874bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static) { 3875 size_t num_fields = 3876 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3877 3878 mirror::ObjectArray<mirror::ArtField>* fields = 3879 is_static ? klass->GetSFields() : klass->GetIFields(); 3880 3881 // Initialize size and field_offset 3882 size_t size; 3883 MemberOffset field_offset(0); 3884 if (is_static) { 3885 size = klass->GetClassSize(); 3886 field_offset = mirror::Class::FieldsOffset(); 3887 } else { 3888 mirror::Class* super_class = klass->GetSuperClass(); 3889 if (super_class != NULL) { 3890 CHECK(super_class->IsResolved()) 3891 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 3892 field_offset = MemberOffset(super_class->GetObjectSize()); 3893 } 3894 size = field_offset.Uint32Value(); 3895 } 3896 3897 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 3898 3899 // we want a relatively stable order so that adding new fields 3900 // minimizes disruption of C++ version such as Class and Method. 3901 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3902 for (size_t i = 0; i < num_fields; i++) { 3903 mirror::ArtField* f = fields->Get(i); 3904 CHECK(f != NULL) << PrettyClass(klass.Get()); 3905 grouped_and_sorted_fields.push_back(f); 3906 } 3907 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 3908 LinkFieldsComparator()); 3909 3910 // References should be at the front. 3911 size_t current_field = 0; 3912 size_t num_reference_fields = 0; 3913 for (; current_field < num_fields; current_field++) { 3914 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3915 Primitive::Type type = field->GetTypeAsPrimitiveType(); 3916 bool isPrimitive = type != Primitive::kPrimNot; 3917 if (isPrimitive) { 3918 break; // past last reference, move on to the next phase 3919 } 3920 grouped_and_sorted_fields.pop_front(); 3921 num_reference_fields++; 3922 fields->Set<false>(current_field, field); 3923 field->SetOffset(field_offset); 3924 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3925 } 3926 3927 // Now we want to pack all of the double-wide fields together. If 3928 // we're not aligned, though, we want to shuffle one 32-bit field 3929 // into place. If we can't find one, we'll have to pad it. 3930 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3931 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3932 mirror::ArtField* field = grouped_and_sorted_fields[i]; 3933 Primitive::Type type = field->GetTypeAsPrimitiveType(); 3934 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 3935 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 3936 continue; 3937 } 3938 fields->Set<false>(current_field++, field); 3939 field->SetOffset(field_offset); 3940 // drop the consumed field 3941 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 3942 break; 3943 } 3944 // whether we found a 32-bit field for padding or not, we advance 3945 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3946 } 3947 3948 // Alignment is good, shuffle any double-wide fields forward, and 3949 // finish assigning field offsets to all fields. 3950 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 3951 << PrettyClass(klass.Get()); 3952 while (!grouped_and_sorted_fields.empty()) { 3953 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3954 grouped_and_sorted_fields.pop_front(); 3955 Primitive::Type type = field->GetTypeAsPrimitiveType(); 3956 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 3957 fields->Set<false>(current_field, field); 3958 field->SetOffset(field_offset); 3959 field_offset = MemberOffset(field_offset.Uint32Value() + 3960 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 3961 ? sizeof(uint64_t) 3962 : sizeof(uint32_t))); 3963 current_field++; 3964 } 3965 3966 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 3967 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 3968 // We know there are no non-reference fields in the Reference classes, and we know 3969 // that 'referent' is alphabetically last, so this is easy... 3970 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 3971 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 3972 --num_reference_fields; 3973 } 3974 3975 if (kIsDebugBuild) { 3976 // Make sure that all reference fields appear before 3977 // non-reference fields, and all double-wide fields are aligned. 3978 bool seen_non_ref = false; 3979 for (size_t i = 0; i < num_fields; i++) { 3980 mirror::ArtField* field = fields->Get(i); 3981 if (false) { // enable to debug field layout 3982 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 3983 << " class=" << PrettyClass(klass.Get()) 3984 << " field=" << PrettyField(field) 3985 << " offset=" 3986 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 3987 } 3988 Primitive::Type type = field->GetTypeAsPrimitiveType(); 3989 bool is_primitive = type != Primitive::kPrimNot; 3990 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 3991 strcmp("referent", field->GetName()) == 0) { 3992 is_primitive = true; // We lied above, so we have to expect a lie here. 3993 } 3994 if (is_primitive) { 3995 if (!seen_non_ref) { 3996 seen_non_ref = true; 3997 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 3998 } 3999 } else { 4000 DCHECK(!seen_non_ref) << PrettyField(field); 4001 } 4002 } 4003 if (!seen_non_ref) { 4004 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4005 } 4006 } 4007 size = field_offset.Uint32Value(); 4008 // Update klass 4009 if (is_static) { 4010 klass->SetNumReferenceStaticFields(num_reference_fields); 4011 klass->SetClassSize(size); 4012 } else { 4013 klass->SetNumReferenceInstanceFields(num_reference_fields); 4014 if (!klass->IsVariableSize()) { 4015 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(); 4016 size_t previous_size = klass->GetObjectSize(); 4017 if (previous_size != 0) { 4018 // Make sure that we didn't originally have an incorrect size. 4019 CHECK_EQ(previous_size, size) << klass->GetDescriptor(); 4020 } 4021 klass->SetObjectSize(size); 4022 } 4023 } 4024 return true; 4025} 4026 4027// Set the bitmap of reference offsets, refOffsets, from the ifields 4028// list. 4029void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4030 uint32_t reference_offsets = 0; 4031 mirror::Class* super_class = klass->GetSuperClass(); 4032 if (super_class != NULL) { 4033 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4034 // If our superclass overflowed, we don't stand a chance. 4035 if (reference_offsets == CLASS_WALK_SUPER) { 4036 klass->SetReferenceInstanceOffsets(reference_offsets); 4037 return; 4038 } 4039 } 4040 CreateReferenceOffsets(klass, false, reference_offsets); 4041} 4042 4043void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4044 CreateReferenceOffsets(klass, true, 0); 4045} 4046 4047void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4048 uint32_t reference_offsets) { 4049 size_t num_reference_fields = 4050 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4051 : klass->NumReferenceInstanceFieldsDuringLinking(); 4052 mirror::ObjectArray<mirror::ArtField>* fields = 4053 is_static ? klass->GetSFields() : klass->GetIFields(); 4054 // All of the fields that contain object references are guaranteed 4055 // to be at the beginning of the fields list. 4056 for (size_t i = 0; i < num_reference_fields; ++i) { 4057 // Note that byte_offset is the offset from the beginning of 4058 // object, not the offset into instance data 4059 mirror::ArtField* field = fields->Get(i); 4060 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4061 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4062 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4063 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4064 CHECK_NE(new_bit, 0U); 4065 reference_offsets |= new_bit; 4066 } else { 4067 reference_offsets = CLASS_WALK_SUPER; 4068 break; 4069 } 4070 } 4071 // Update fields in klass 4072 if (is_static) { 4073 klass->SetReferenceStaticOffsets(reference_offsets); 4074 } else { 4075 klass->SetReferenceInstanceOffsets(reference_offsets); 4076 } 4077} 4078 4079mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4080 Handle<mirror::DexCache> dex_cache) { 4081 DCHECK(dex_cache.Get() != nullptr); 4082 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4083 if (resolved != NULL) { 4084 return resolved; 4085 } 4086 uint32_t utf16_length; 4087 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4088 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4089 dex_cache->SetResolvedString(string_idx, string); 4090 return string; 4091} 4092 4093mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4094 mirror::Class* referrer) { 4095 StackHandleScope<2> hs(Thread::Current()); 4096 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4097 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4098 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4099} 4100 4101mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4102 Handle<mirror::DexCache> dex_cache, 4103 Handle<mirror::ClassLoader> class_loader) { 4104 DCHECK(dex_cache.Get() != NULL); 4105 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4106 if (resolved == NULL) { 4107 Thread* self = Thread::Current(); 4108 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4109 resolved = FindClass(self, descriptor, class_loader); 4110 if (resolved != NULL) { 4111 // TODO: we used to throw here if resolved's class loader was not the 4112 // boot class loader. This was to permit different classes with the 4113 // same name to be loaded simultaneously by different loaders 4114 dex_cache->SetResolvedType(type_idx, resolved); 4115 } else { 4116 CHECK(self->IsExceptionPending()) 4117 << "Expected pending exception for failed resolution of: " << descriptor; 4118 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4119 StackHandleScope<1> hs(self); 4120 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4121 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4122 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4123 self->ClearException(); 4124 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4125 self->GetException(NULL)->SetCause(cause.Get()); 4126 } 4127 } 4128 } 4129 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4130 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4131 return resolved; 4132} 4133 4134mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 4135 Handle<mirror::DexCache> dex_cache, 4136 Handle<mirror::ClassLoader> class_loader, 4137 Handle<mirror::ArtMethod> referrer, 4138 InvokeType type) { 4139 DCHECK(dex_cache.Get() != NULL); 4140 // Check for hit in the dex cache. 4141 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4142 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 4143 return resolved; 4144 } 4145 // Fail, get the declaring class. 4146 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4147 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4148 if (klass == NULL) { 4149 DCHECK(Thread::Current()->IsExceptionPending()); 4150 return NULL; 4151 } 4152 // Scan using method_idx, this saves string compares but will only hit for matching dex 4153 // caches/files. 4154 switch (type) { 4155 case kDirect: // Fall-through. 4156 case kStatic: 4157 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 4158 break; 4159 case kInterface: 4160 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 4161 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4162 break; 4163 case kSuper: // Fall-through. 4164 case kVirtual: 4165 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 4166 break; 4167 default: 4168 LOG(FATAL) << "Unreachable - invocation type: " << type; 4169 } 4170 if (resolved == NULL) { 4171 // Search by name, which works across dex files. 4172 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4173 const Signature signature = dex_file.GetMethodSignature(method_id); 4174 switch (type) { 4175 case kDirect: // Fall-through. 4176 case kStatic: 4177 resolved = klass->FindDirectMethod(name, signature); 4178 break; 4179 case kInterface: 4180 resolved = klass->FindInterfaceMethod(name, signature); 4181 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4182 break; 4183 case kSuper: // Fall-through. 4184 case kVirtual: 4185 resolved = klass->FindVirtualMethod(name, signature); 4186 break; 4187 } 4188 } 4189 if (resolved != NULL) { 4190 // We found a method, check for incompatible class changes. 4191 if (resolved->CheckIncompatibleClassChange(type)) { 4192 resolved = NULL; 4193 } 4194 } 4195 if (resolved != NULL) { 4196 // Be a good citizen and update the dex cache to speed subsequent calls. 4197 dex_cache->SetResolvedMethod(method_idx, resolved); 4198 return resolved; 4199 } else { 4200 // We failed to find the method which means either an access error, an incompatible class 4201 // change, or no such method. First try to find the method among direct and virtual methods. 4202 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4203 const Signature signature = dex_file.GetMethodSignature(method_id); 4204 switch (type) { 4205 case kDirect: 4206 case kStatic: 4207 resolved = klass->FindVirtualMethod(name, signature); 4208 break; 4209 case kInterface: 4210 case kVirtual: 4211 case kSuper: 4212 resolved = klass->FindDirectMethod(name, signature); 4213 break; 4214 } 4215 4216 // If we found something, check that it can be accessed by the referrer. 4217 if (resolved != NULL && referrer.Get() != NULL) { 4218 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4219 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4220 if (!referring_class->CanAccess(methods_class)) { 4221 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4222 resolved, type); 4223 return NULL; 4224 } else if (!referring_class->CanAccessMember(methods_class, 4225 resolved->GetAccessFlags())) { 4226 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4227 return NULL; 4228 } 4229 } 4230 4231 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4232 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4233 switch (type) { 4234 case kDirect: 4235 case kStatic: 4236 if (resolved != NULL) { 4237 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4238 } else { 4239 resolved = klass->FindInterfaceMethod(name, signature); 4240 if (resolved != NULL) { 4241 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4242 } else { 4243 ThrowNoSuchMethodError(type, klass, name, signature); 4244 } 4245 } 4246 break; 4247 case kInterface: 4248 if (resolved != NULL) { 4249 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4250 } else { 4251 resolved = klass->FindVirtualMethod(name, signature); 4252 if (resolved != NULL) { 4253 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4254 } else { 4255 ThrowNoSuchMethodError(type, klass, name, signature); 4256 } 4257 } 4258 break; 4259 case kSuper: 4260 ThrowNoSuchMethodError(type, klass, name, signature); 4261 break; 4262 case kVirtual: 4263 if (resolved != NULL) { 4264 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4265 } else { 4266 resolved = klass->FindInterfaceMethod(name, signature); 4267 if (resolved != NULL) { 4268 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4269 } else { 4270 ThrowNoSuchMethodError(type, klass, name, signature); 4271 } 4272 } 4273 break; 4274 } 4275 DCHECK(Thread::Current()->IsExceptionPending()); 4276 return NULL; 4277 } 4278} 4279 4280mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4281 Handle<mirror::DexCache> dex_cache, 4282 Handle<mirror::ClassLoader> class_loader, 4283 bool is_static) { 4284 DCHECK(dex_cache.Get() != nullptr); 4285 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4286 if (resolved != NULL) { 4287 return resolved; 4288 } 4289 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4290 Thread* const self = Thread::Current(); 4291 StackHandleScope<1> hs(self); 4292 Handle<mirror::Class> klass( 4293 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4294 if (klass.Get() == NULL) { 4295 DCHECK(Thread::Current()->IsExceptionPending()); 4296 return NULL; 4297 } 4298 4299 if (is_static) { 4300 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 4301 } else { 4302 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 4303 } 4304 4305 if (resolved == NULL) { 4306 const char* name = dex_file.GetFieldName(field_id); 4307 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4308 if (is_static) { 4309 resolved = mirror::Class::FindStaticField(self, klass, name, type); 4310 } else { 4311 resolved = klass->FindInstanceField(name, type); 4312 } 4313 if (resolved == NULL) { 4314 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 4315 return NULL; 4316 } 4317 } 4318 dex_cache->SetResolvedField(field_idx, resolved); 4319 return resolved; 4320} 4321 4322mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4323 uint32_t field_idx, 4324 Handle<mirror::DexCache> dex_cache, 4325 Handle<mirror::ClassLoader> class_loader) { 4326 DCHECK(dex_cache.Get() != nullptr); 4327 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4328 if (resolved != NULL) { 4329 return resolved; 4330 } 4331 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4332 Thread* self = Thread::Current(); 4333 StackHandleScope<1> hs(self); 4334 Handle<mirror::Class> klass( 4335 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4336 if (klass.Get() == NULL) { 4337 DCHECK(Thread::Current()->IsExceptionPending()); 4338 return NULL; 4339 } 4340 4341 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4342 StringPiece type(dex_file.StringDataByIdx( 4343 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4344 resolved = mirror::Class::FindField(self, klass, name, type); 4345 if (resolved != NULL) { 4346 dex_cache->SetResolvedField(field_idx, resolved); 4347 } else { 4348 ThrowNoSuchFieldError("", klass.Get(), type, name); 4349 } 4350 return resolved; 4351} 4352 4353const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4354 uint32_t* length) { 4355 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4356 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4357 const DexFile& dex_file = *dex_cache->GetDexFile(); 4358 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4359 return dex_file.GetMethodShorty(method_id, length); 4360} 4361 4362void ClassLinker::DumpAllClasses(int flags) { 4363 if (dex_cache_image_class_lookup_required_) { 4364 MoveImageClassesToClassTable(); 4365 } 4366 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4367 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4368 std::vector<mirror::Class*> all_classes; 4369 { 4370 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4371 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 4372 mirror::Class** root = &it.second; 4373 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 4374 all_classes.push_back(klass); 4375 } 4376 } 4377 4378 for (size_t i = 0; i < all_classes.size(); ++i) { 4379 all_classes[i]->DumpClass(std::cerr, flags); 4380 } 4381} 4382 4383void ClassLinker::DumpForSigQuit(std::ostream& os) { 4384 if (dex_cache_image_class_lookup_required_) { 4385 MoveImageClassesToClassTable(); 4386 } 4387 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4388 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4389} 4390 4391size_t ClassLinker::NumLoadedClasses() { 4392 if (dex_cache_image_class_lookup_required_) { 4393 MoveImageClassesToClassTable(); 4394 } 4395 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4396 return class_table_.size(); 4397} 4398 4399pid_t ClassLinker::GetClassesLockOwner() { 4400 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4401} 4402 4403pid_t ClassLinker::GetDexLockOwner() { 4404 return dex_lock_.GetExclusiveOwnerTid(); 4405} 4406 4407void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4408 DCHECK(!init_done_); 4409 4410 DCHECK(klass != NULL); 4411 DCHECK(klass->GetClassLoader() == NULL); 4412 4413 DCHECK(class_roots_ != NULL); 4414 DCHECK(class_roots_->Get(class_root) == NULL); 4415 class_roots_->Set<false>(class_root, klass); 4416} 4417 4418} // namespace art 4419