class_linker.cc revision 15a33b3f88546bce85dcb9d28caf200da51154d7
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 <unistd.h> 23#include <deque> 24#include <memory> 25#include <string> 26#include <utility> 27#include <vector> 28 29#include "base/casts.h" 30#include "base/logging.h" 31#include "base/scoped_flock.h" 32#include "base/stl_util.h" 33#include "base/unix_file/fd_file.h" 34#include "class_linker-inl.h" 35#include "compiler_callbacks.h" 36#include "debugger.h" 37#include "dex_file-inl.h" 38#include "gc_root-inl.h" 39#include "gc/accounting/card_table-inl.h" 40#include "gc/accounting/heap_bitmap.h" 41#include "gc/heap.h" 42#include "gc/space/image_space.h" 43#include "handle_scope.h" 44#include "intern_table.h" 45#include "interpreter/interpreter.h" 46#include "leb128.h" 47#include "method_helper-inl.h" 48#include "oat.h" 49#include "oat_file.h" 50#include "object_lock.h" 51#include "mirror/art_field-inl.h" 52#include "mirror/art_method-inl.h" 53#include "mirror/class.h" 54#include "mirror/class-inl.h" 55#include "mirror/class_loader.h" 56#include "mirror/dex_cache-inl.h" 57#include "mirror/iftable-inl.h" 58#include "mirror/object-inl.h" 59#include "mirror/object_array-inl.h" 60#include "mirror/proxy.h" 61#include "mirror/reference-inl.h" 62#include "mirror/stack_trace_element.h" 63#include "mirror/string-inl.h" 64#include "os.h" 65#include "runtime.h" 66#include "entrypoints/entrypoint_utils.h" 67#include "ScopedLocalRef.h" 68#include "scoped_thread_state_change.h" 69#include "handle_scope-inl.h" 70#include "thread.h" 71#include "utils.h" 72#include "verifier/method_verifier.h" 73#include "well_known_classes.h" 74 75namespace art { 76 77static void ThrowNoClassDefFoundError(const char* fmt, ...) 78 __attribute__((__format__(__printf__, 1, 2))) 79 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 80static void ThrowNoClassDefFoundError(const char* fmt, ...) { 81 va_list args; 82 va_start(args, fmt); 83 Thread* self = Thread::Current(); 84 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 85 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 86 va_end(args); 87} 88 89static void ThrowEarlierClassFailure(mirror::Class* c) 90 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 91 // The class failed to initialize on a previous attempt, so we want to throw 92 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 93 // failed in verification, in which case v2 5.4.1 says we need to re-throw 94 // the previous error. 95 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 96 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 97 } 98 99 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 100 Thread* self = Thread::Current(); 101 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 102 if (c->GetVerifyErrorClass() != nullptr) { 103 // TODO: change the verifier to store an _instance_, with a useful detail message? 104 std::string temp; 105 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 106 PrettyDescriptor(c).c_str()); 107 } else { 108 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 109 PrettyDescriptor(c).c_str()); 110 } 111} 112 113static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 114 Thread* self = Thread::Current(); 115 JNIEnv* env = self->GetJniEnv(); 116 117 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 118 CHECK(cause.get() != nullptr); 119 120 env->ExceptionClear(); 121 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 122 env->Throw(cause.get()); 123 124 // We only wrap non-Error exceptions; an Error can just be used as-is. 125 if (!is_error) { 126 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 127 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", 128 nullptr); 129 } 130} 131 132const char* ClassLinker::class_roots_descriptors_[] = { 133 "Ljava/lang/Class;", 134 "Ljava/lang/Object;", 135 "[Ljava/lang/Class;", 136 "[Ljava/lang/Object;", 137 "Ljava/lang/String;", 138 "Ljava/lang/DexCache;", 139 "Ljava/lang/ref/Reference;", 140 "Ljava/lang/reflect/ArtField;", 141 "Ljava/lang/reflect/ArtMethod;", 142 "Ljava/lang/reflect/Proxy;", 143 "[Ljava/lang/String;", 144 "[Ljava/lang/reflect/ArtField;", 145 "[Ljava/lang/reflect/ArtMethod;", 146 "Ljava/lang/ClassLoader;", 147 "Ljava/lang/Throwable;", 148 "Ljava/lang/ClassNotFoundException;", 149 "Ljava/lang/StackTraceElement;", 150 "Z", 151 "B", 152 "C", 153 "D", 154 "F", 155 "I", 156 "J", 157 "S", 158 "V", 159 "[Z", 160 "[B", 161 "[C", 162 "[D", 163 "[F", 164 "[I", 165 "[J", 166 "[S", 167 "[Ljava/lang/StackTraceElement;", 168}; 169 170ClassLinker::ClassLinker(InternTable* intern_table) 171 // dex_lock_ is recursive as it may be used in stack dumping. 172 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 173 dex_cache_image_class_lookup_required_(false), 174 failed_dex_cache_class_lookups_(0), 175 class_roots_(nullptr), 176 array_iftable_(nullptr), 177 find_array_class_cache_next_victim_(0), 178 init_done_(false), 179 log_new_dex_caches_roots_(false), 180 log_new_class_table_roots_(false), 181 intern_table_(intern_table), 182 portable_resolution_trampoline_(nullptr), 183 quick_resolution_trampoline_(nullptr), 184 portable_imt_conflict_trampoline_(nullptr), 185 quick_imt_conflict_trampoline_(nullptr), 186 quick_generic_jni_trampoline_(nullptr), 187 quick_to_interpreter_bridge_trampoline_(nullptr), 188 image_pointer_size_(sizeof(void*)) { 189 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 190 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 191} 192 193// To set a value for generic JNI. May be necessary in compiler tests. 194extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 195extern "C" void art_quick_resolution_trampoline(mirror::ArtMethod*); 196extern "C" void art_quick_imt_conflict_trampoline(mirror::ArtMethod*); 197extern "C" void art_quick_to_interpreter_bridge(mirror::ArtMethod*); 198 199void ClassLinker::InitWithoutImage(const std::vector<const DexFile*>& boot_class_path) { 200 VLOG(startup) << "ClassLinker::Init"; 201 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 202 203 CHECK(!init_done_); 204 205 // java_lang_Class comes first, it's needed for AllocClass 206 Thread* self = Thread::Current(); 207 gc::Heap* heap = Runtime::Current()->GetHeap(); 208 // The GC can't handle an object with a null class since we can't get the size of this object. 209 heap->IncrementDisableMovingGC(self); 210 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 211 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 212 heap->AllocNonMovableObject<true>(self, nullptr, 213 mirror::Class::ClassClassSize(), 214 VoidFunctor())))); 215 CHECK(java_lang_Class.Get() != nullptr); 216 mirror::Class::SetClassClass(java_lang_Class.Get()); 217 java_lang_Class->SetClass(java_lang_Class.Get()); 218 if (kUseBakerOrBrooksReadBarrier) { 219 java_lang_Class->AssertReadBarrierPointer(); 220 } 221 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 222 heap->DecrementDisableMovingGC(self); 223 // AllocClass(mirror::Class*) can now be used 224 225 // Class[] is used for reflection support. 226 Handle<mirror::Class> class_array_class(hs.NewHandle( 227 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 228 class_array_class->SetComponentType(java_lang_Class.Get()); 229 230 // java_lang_Object comes next so that object_array_class can be created. 231 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 232 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 233 CHECK(java_lang_Object.Get() != nullptr); 234 // backfill Object as the super class of Class. 235 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 236 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 237 238 // Object[] next to hold class roots. 239 Handle<mirror::Class> object_array_class(hs.NewHandle( 240 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 241 object_array_class->SetComponentType(java_lang_Object.Get()); 242 243 // Setup the char (primitive) class to be used for char[]. 244 Handle<mirror::Class> char_class(hs.NewHandle( 245 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 246 247 // Setup the char[] class to be used for String. 248 Handle<mirror::Class> char_array_class(hs.NewHandle( 249 AllocClass(self, java_lang_Class.Get(), 250 mirror::Array::ClassSize()))); 251 char_array_class->SetComponentType(char_class.Get()); 252 mirror::CharArray::SetArrayClass(char_array_class.Get()); 253 254 // Setup String. 255 Handle<mirror::Class> java_lang_String(hs.NewHandle( 256 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 257 mirror::String::SetClass(java_lang_String.Get()); 258 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 259 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 260 261 // Setup Reference. 262 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 263 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 264 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 265 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 266 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 267 268 // Create storage for root classes, save away our work so far (requires descriptors). 269 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 270 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 271 kClassRootsMax)); 272 CHECK(!class_roots_.IsNull()); 273 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 274 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 275 SetClassRoot(kClassArrayClass, class_array_class.Get()); 276 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 277 SetClassRoot(kCharArrayClass, char_array_class.Get()); 278 SetClassRoot(kJavaLangString, java_lang_String.Get()); 279 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 280 281 // Setup the primitive type classes. 282 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 283 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 284 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 285 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 286 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 287 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 288 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 289 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 290 291 // Create array interface entries to populate once we can load system classes. 292 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 293 294 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 295 Handle<mirror::Class> int_array_class(hs.NewHandle( 296 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 297 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 298 mirror::IntArray::SetArrayClass(int_array_class.Get()); 299 SetClassRoot(kIntArrayClass, int_array_class.Get()); 300 301 // now that these are registered, we can use AllocClass() and AllocObjectArray 302 303 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 304 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 305 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 306 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 307 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 308 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 309 310 // Constructor, Field, Method, and AbstractMethod are necessary so 311 // that FindClass can link members. 312 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 313 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 314 CHECK(java_lang_reflect_ArtField.Get() != nullptr); 315 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 316 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 317 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 318 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 319 320 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 321 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 322 CHECK(java_lang_reflect_ArtMethod.Get() != nullptr); 323 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize(sizeof(void*))); 324 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 325 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 326 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 327 328 // Set up array classes for string, field, method 329 Handle<mirror::Class> object_array_string(hs.NewHandle( 330 AllocClass(self, java_lang_Class.Get(), 331 mirror::ObjectArray<mirror::String>::ClassSize()))); 332 object_array_string->SetComponentType(java_lang_String.Get()); 333 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 334 335 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 336 AllocClass(self, java_lang_Class.Get(), 337 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 338 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 339 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 340 341 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 342 AllocClass(self, java_lang_Class.Get(), 343 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 344 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 345 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 346 347 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 348 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 349 // these roots. 350 CHECK_NE(0U, boot_class_path.size()); 351 for (const DexFile* dex_file : boot_class_path) { 352 CHECK(dex_file != nullptr); 353 AppendToBootClassPath(*dex_file); 354 } 355 356 // now we can use FindSystemClass 357 358 // run char class through InitializePrimitiveClass to finish init 359 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 360 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 361 362 // Create runtime resolution and imt conflict methods. Also setup the default imt. 363 Runtime* runtime = Runtime::Current(); 364 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 365 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 366 runtime->SetImtUnimplementedMethod(runtime->CreateImtConflictMethod()); 367 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 368 369 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 370 // we do not need friend classes or a publicly exposed setter. 371 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 372 if (!runtime->IsCompiler()) { 373 // We need to set up the generic trampolines since we don't have an image. 374 quick_resolution_trampoline_ = reinterpret_cast<void*>(art_quick_resolution_trampoline); 375 quick_imt_conflict_trampoline_ = reinterpret_cast<void*>(art_quick_imt_conflict_trampoline); 376 quick_to_interpreter_bridge_trampoline_ = reinterpret_cast<void*>(art_quick_to_interpreter_bridge); 377 } 378 379 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 380 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 381 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 382 CHECK_EQ(java_lang_Object.Get(), Object_class); 383 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 384 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 385 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 386 std::ostringstream os1, os2; 387 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 388 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 389 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 390 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 391 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 392 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 393 CHECK_EQ(java_lang_String.Get(), String_class); 394 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 395 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 396 397 // Setup the primitive array type classes - can't be done until Object has a vtable. 398 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 399 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 400 401 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 402 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 403 404 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 405 CHECK_EQ(char_array_class.Get(), found_char_array_class); 406 407 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 408 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 409 410 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 411 CHECK_EQ(int_array_class.Get(), found_int_array_class); 412 413 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 414 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 415 416 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 417 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 418 419 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 420 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 421 422 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 423 CHECK_EQ(class_array_class.Get(), found_class_array_class); 424 425 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 426 CHECK_EQ(object_array_class.Get(), found_object_array_class); 427 428 // Setup the single, global copy of "iftable". 429 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 430 CHECK(java_lang_Cloneable != nullptr); 431 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 432 CHECK(java_io_Serializable != nullptr); 433 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 434 // crawl up and explicitly list all of the supers as well. 435 { 436 mirror::IfTable* array_iftable = array_iftable_.Read(); 437 array_iftable->SetInterface(0, java_lang_Cloneable); 438 array_iftable->SetInterface(1, java_io_Serializable); 439 } 440 441 // Sanity check Class[] and Object[]'s interfaces. 442 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 443 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 444 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 445 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 446 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 447 // dex_cache_ fields and register them in class_table_. 448 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 449 CHECK_EQ(java_lang_Class.Get(), Class_class); 450 451 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 452 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 453 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 454 455 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 456 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 457 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 458 459 mirror::Class* String_array_class = 460 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 461 CHECK_EQ(object_array_string.Get(), String_array_class); 462 463 mirror::Class* Art_method_array_class = 464 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 465 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 466 467 mirror::Class* Art_field_array_class = 468 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 469 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 470 471 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 472 473 // Create java.lang.reflect.Proxy root. 474 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 475 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 476 477 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 478 // finish initializing Reference class 479 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 480 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 481 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 482 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 483 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 484 mirror::Class* java_lang_ref_FinalizerReference = 485 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 486 java_lang_ref_FinalizerReference->SetAccessFlags( 487 java_lang_ref_FinalizerReference->GetAccessFlags() | 488 kAccClassIsReference | kAccClassIsFinalizerReference); 489 mirror::Class* java_lang_ref_PhantomReference = 490 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 491 java_lang_ref_PhantomReference->SetAccessFlags( 492 java_lang_ref_PhantomReference->GetAccessFlags() | 493 kAccClassIsReference | kAccClassIsPhantomReference); 494 mirror::Class* java_lang_ref_SoftReference = 495 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 496 java_lang_ref_SoftReference->SetAccessFlags( 497 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 498 mirror::Class* java_lang_ref_WeakReference = 499 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 500 java_lang_ref_WeakReference->SetAccessFlags( 501 java_lang_ref_WeakReference->GetAccessFlags() | 502 kAccClassIsReference | kAccClassIsWeakReference); 503 504 // Setup the ClassLoader, verifying the object_size_. 505 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 506 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 507 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 508 509 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 510 // java.lang.StackTraceElement as a convenience. 511 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 512 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 513 SetClassRoot(kJavaLangClassNotFoundException, 514 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 515 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 516 SetClassRoot(kJavaLangStackTraceElementArrayClass, 517 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 518 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 519 520 // Ensure void type is resolved in the core's dex cache so java.lang.Void is correctly 521 // initialized. 522 { 523 const DexFile& dex_file = java_lang_Object->GetDexFile(); 524 const DexFile::StringId* void_string_id = dex_file.FindStringId("V"); 525 CHECK(void_string_id != nullptr); 526 uint32_t void_string_index = dex_file.GetIndexForStringId(*void_string_id); 527 const DexFile::TypeId* void_type_id = dex_file.FindTypeId(void_string_index); 528 CHECK(void_type_id != nullptr); 529 uint16_t void_type_idx = dex_file.GetIndexForTypeId(*void_type_id); 530 // Now we resolve void type so the dex cache contains it. We use java.lang.Object class 531 // as referrer so the used dex cache is core's one. 532 mirror::Class* resolved_type = ResolveType(dex_file, void_type_idx, java_lang_Object.Get()); 533 CHECK_EQ(resolved_type, GetClassRoot(kPrimitiveVoid)); 534 self->AssertNoPendingException(); 535 } 536 537 FinishInit(self); 538 539 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 540} 541 542void ClassLinker::FinishInit(Thread* self) { 543 VLOG(startup) << "ClassLinker::FinishInit entering"; 544 545 // Let the heap know some key offsets into java.lang.ref instances 546 // Note: we hard code the field indexes here rather than using FindInstanceField 547 // as the types of the field can't be resolved prior to the runtime being 548 // fully initialized 549 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 550 mirror::Class* java_lang_ref_FinalizerReference = 551 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 552 553 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 554 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 555 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 556 557 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 558 CHECK_STREQ(queue->GetName(), "queue"); 559 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 560 561 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 562 CHECK_STREQ(queueNext->GetName(), "queueNext"); 563 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 564 565 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 566 CHECK_STREQ(referent->GetName(), "referent"); 567 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 568 569 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 570 CHECK_STREQ(zombie->GetName(), "zombie"); 571 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 572 573 // ensure all class_roots_ are initialized 574 for (size_t i = 0; i < kClassRootsMax; i++) { 575 ClassRoot class_root = static_cast<ClassRoot>(i); 576 mirror::Class* klass = GetClassRoot(class_root); 577 CHECK(klass != nullptr); 578 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != nullptr); 579 // note SetClassRoot does additional validation. 580 // if possible add new checks there to catch errors early 581 } 582 583 CHECK(!array_iftable_.IsNull()); 584 585 // disable the slow paths in FindClass and CreatePrimitiveClass now 586 // that Object, Class, and Object[] are setup 587 init_done_ = true; 588 589 VLOG(startup) << "ClassLinker::FinishInit exiting"; 590} 591 592void ClassLinker::RunRootClinits() { 593 Thread* self = Thread::Current(); 594 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 595 mirror::Class* c = GetClassRoot(ClassRoot(i)); 596 if (!c->IsArrayClass() && !c->IsPrimitive()) { 597 StackHandleScope<1> hs(self); 598 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 599 EnsureInitialized(h_class, true, true); 600 self->AssertNoPendingException(); 601 } 602 } 603} 604 605bool ClassLinker::GenerateOatFile(const char* dex_filename, 606 int oat_fd, 607 const char* oat_cache_filename, 608 std::string* error_msg) { 609 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 610 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 611 612 gc::Heap* heap = Runtime::Current()->GetHeap(); 613 std::string boot_image_option("--boot-image="); 614 if (heap->GetImageSpace() == nullptr) { 615 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 616 // out of space anyway it might not matter. 617 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 618 "without an image.", dex_filename); 619 return false; 620 } 621 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 622 623 std::string dex_file_option("--dex-file="); 624 dex_file_option += dex_filename; 625 626 std::string oat_fd_option("--oat-fd="); 627 StringAppendF(&oat_fd_option, "%d", oat_fd); 628 629 std::string oat_location_option("--oat-location="); 630 oat_location_option += oat_cache_filename; 631 632 std::vector<std::string> argv; 633 argv.push_back(dex2oat); 634 argv.push_back("--runtime-arg"); 635 argv.push_back("-classpath"); 636 argv.push_back("--runtime-arg"); 637 argv.push_back(Runtime::Current()->GetClassPathString()); 638 639 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 640 641 if (!Runtime::Current()->IsVerificationEnabled()) { 642 argv.push_back("--compiler-filter=verify-none"); 643 } 644 645 if (Runtime::Current()->MustRelocateIfPossible()) { 646 argv.push_back("--runtime-arg"); 647 argv.push_back("-Xrelocate"); 648 } else { 649 argv.push_back("--runtime-arg"); 650 argv.push_back("-Xnorelocate"); 651 } 652 653 if (!kIsTargetBuild) { 654 argv.push_back("--host"); 655 } 656 657 argv.push_back(boot_image_option); 658 argv.push_back(dex_file_option); 659 argv.push_back(oat_fd_option); 660 argv.push_back(oat_location_option); 661 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 662 for (size_t i = 0; i < compiler_options.size(); ++i) { 663 argv.push_back(compiler_options[i].c_str()); 664 } 665 666 if (!Exec(argv, error_msg)) { 667 // Manually delete the file. Ensures there is no garbage left over if the process unexpectedly 668 // died. Ignore unlink failure, propagate the original error. 669 TEMP_FAILURE_RETRY(unlink(oat_cache_filename)); 670 return false; 671 } 672 673 return true; 674} 675 676const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 677 WriterMutexLock mu(Thread::Current(), dex_lock_); 678 if (kIsDebugBuild) { 679 for (size_t i = 0; i < oat_files_.size(); ++i) { 680 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 681 } 682 } 683 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 684 oat_files_.push_back(oat_file); 685 return oat_file; 686} 687 688OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 689 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 690 OatFile* oat_file = space->ReleaseOatFile(); 691 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 692 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 693 return *oat_file; 694} 695 696const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFileForDexFile(const DexFile& dex_file) { 697 const char* dex_location = dex_file.GetLocation().c_str(); 698 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 699 return FindOpenedOatDexFile(nullptr, dex_location, &dex_location_checksum); 700} 701 702const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFile(const char* oat_location, 703 const char* dex_location, 704 const uint32_t* dex_location_checksum) { 705 ReaderMutexLock mu(Thread::Current(), dex_lock_); 706 for (const OatFile* oat_file : oat_files_) { 707 DCHECK(oat_file != nullptr); 708 709 if (oat_location != nullptr) { 710 if (oat_file->GetLocation() != oat_location) { 711 continue; 712 } 713 } 714 715 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 716 dex_location_checksum, 717 false); 718 if (oat_dex_file != nullptr) { 719 return oat_dex_file; 720 } 721 } 722 return nullptr; 723} 724 725 726// Loads all multi dex files from the given oat file returning true on success. 727// 728// Parameters: 729// oat_file - the oat file to load from 730// dex_location - the dex location used to generate the oat file 731// dex_location_checksum - the checksum of the dex_location (may be null for pre-opted files) 732// generated - whether or not the oat_file existed before or was just (re)generated 733// error_msgs - any error messages will be appended here 734// dex_files - the loaded dex_files will be appended here (only if the loading succeeds) 735static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, 736 const char* dex_location, 737 const uint32_t* dex_location_checksum, 738 bool generated, 739 std::vector<std::string>* error_msgs, 740 std::vector<const DexFile*>* dex_files) { 741 if (oat_file == nullptr) { 742 return false; 743 } 744 745 size_t old_size = dex_files->size(); // To rollback on error. 746 747 bool success = true; 748 for (size_t i = 0; success; ++i) { 749 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 750 const char* next_name = next_name_str.c_str(); 751 752 uint32_t next_location_checksum; 753 uint32_t* next_location_checksum_pointer = &next_location_checksum; 754 std::string error_msg; 755 if ((i == 0) && (strcmp(next_name, dex_location) == 0)) { 756 // When i=0 the multidex name should be the same as the location name. We already have the 757 // checksum it so we don't need to recompute it. 758 if (dex_location_checksum == nullptr) { 759 next_location_checksum_pointer = nullptr; 760 } else { 761 next_location_checksum = *dex_location_checksum; 762 } 763 } else if (!DexFile::GetChecksum(next_name, next_location_checksum_pointer, &error_msg)) { 764 DCHECK_EQ(false, i == 0 && generated); 765 next_location_checksum_pointer = nullptr; 766 } 767 768 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 769 770 if (oat_dex_file == nullptr) { 771 if (i == 0 && generated) { 772 std::string error_msg; 773 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 774 " file'%s'", dex_location, next_location_checksum, 775 oat_file->GetLocation().c_str()); 776 error_msgs->push_back(error_msg); 777 } 778 break; // Not found, done. 779 } 780 781 // Checksum test. Test must succeed when generated. 782 success = !generated; 783 if (next_location_checksum_pointer != nullptr) { 784 success = next_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 785 } 786 787 if (success) { 788 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 789 if (dex_file == nullptr) { 790 success = false; 791 error_msgs->push_back(error_msg); 792 } else { 793 dex_files->push_back(dex_file); 794 } 795 } 796 797 // When we generated the file, we expect success, or something is terribly wrong. 798 CHECK_EQ(false, generated && !success) 799 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 800 << std::hex << " dex_location_checksum=" << next_location_checksum 801 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 802 } 803 804 if (dex_files->size() == old_size) { 805 success = false; // We did not even find classes.dex 806 } 807 808 if (success) { 809 return true; 810 } else { 811 // Free all the dex files we have loaded. 812 auto it = dex_files->begin() + old_size; 813 auto it_end = dex_files->end(); 814 for (; it != it_end; it++) { 815 delete *it; 816 } 817 dex_files->erase(dex_files->begin() + old_size, it_end); 818 819 return false; 820 } 821} 822 823// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 824// complicates the loading process, as we should not use an iterative loading process, because that 825// would register the oat file and dex files that come before the broken one. Instead, check all 826// multidex ahead of time. 827bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 828 std::vector<std::string>* error_msgs, 829 std::vector<const DexFile*>* dex_files) { 830 // 1) Check whether we have an open oat file. 831 // This requires a dex checksum, use the "primary" one. 832 uint32_t dex_location_checksum; 833 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 834 bool have_checksum = true; 835 std::string checksum_error_msg; 836 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 837 // This happens for pre-opted files since the corresponding dex files are no longer on disk. 838 dex_location_checksum_pointer = nullptr; 839 have_checksum = false; 840 } 841 842 bool needs_registering = false; 843 844 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFile(oat_location, dex_location, 845 dex_location_checksum_pointer); 846 std::unique_ptr<const OatFile> open_oat_file( 847 oat_dex_file != nullptr ? oat_dex_file->GetOatFile() : nullptr); 848 849 // 2) If we do not have an open one, maybe there's one on disk already. 850 851 // In case the oat file is not open, we play a locking game here so 852 // that if two different processes race to load and register or generate 853 // (or worse, one tries to open a partial generated file) we will be okay. 854 // This is actually common with apps that use DexClassLoader to work 855 // around the dex method reference limit and that have a background 856 // service running in a separate process. 857 ScopedFlock scoped_flock; 858 859 if (open_oat_file.get() == nullptr) { 860 if (oat_location != nullptr) { 861 // Can only do this if we have a checksum, else error. 862 if (!have_checksum) { 863 error_msgs->push_back(checksum_error_msg); 864 return false; 865 } 866 867 std::string error_msg; 868 869 // We are loading or creating one in the future. Time to set up the file lock. 870 if (!scoped_flock.Init(oat_location, &error_msg)) { 871 error_msgs->push_back(error_msg); 872 return false; 873 } 874 875 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 876 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 877 oat_location, &error_msg)); 878 879 if (open_oat_file.get() == nullptr) { 880 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 881 dex_location, oat_location, error_msg.c_str()); 882 VLOG(class_linker) << compound_msg; 883 error_msgs->push_back(compound_msg); 884 } 885 } else { 886 // TODO: What to lock here? 887 bool obsolete_file_cleanup_failed; 888 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 889 dex_location_checksum_pointer, 890 kRuntimeISA, error_msgs, 891 &obsolete_file_cleanup_failed)); 892 // There's no point in going forward and eventually try to regenerate the 893 // file if we couldn't remove the obsolete one. Mostly likely we will fail 894 // with the same error when trying to write the new file. 895 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 896 if (obsolete_file_cleanup_failed) { 897 return false; 898 } 899 } 900 needs_registering = true; 901 } 902 903 // 3) If we have an oat file, check all contained multidex files for our dex_location. 904 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 905 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 906 dex_location_checksum_pointer, 907 false, error_msgs, dex_files); 908 if (success) { 909 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 910 if (needs_registering) { 911 // We opened the oat file, so we must register it. 912 RegisterOatFile(oat_file); 913 } 914 // If the file isn't executable we failed patchoat but did manage to get the dex files. 915 return oat_file->IsExecutable(); 916 } else { 917 if (needs_registering) { 918 // We opened it, delete it. 919 open_oat_file.reset(); 920 } else { 921 open_oat_file.release(); // Do not delete open oat files. 922 } 923 } 924 925 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 926 927 // Need a checksum, fail else. 928 if (!have_checksum) { 929 error_msgs->push_back(checksum_error_msg); 930 return false; 931 } 932 933 // Look in cache location if no oat_location is given. 934 std::string cache_location; 935 if (oat_location == nullptr) { 936 // Use the dalvik cache. 937 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 938 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 939 oat_location = cache_location.c_str(); 940 } 941 942 bool has_flock = true; 943 // Definitely need to lock now. 944 if (!scoped_flock.HasFile()) { 945 std::string error_msg; 946 if (!scoped_flock.Init(oat_location, &error_msg)) { 947 error_msgs->push_back(error_msg); 948 has_flock = false; 949 } 950 } 951 952 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 953 // Create the oat file. 954 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 955 oat_location, error_msgs)); 956 } 957 958 // Failed, bail. 959 if (open_oat_file.get() == nullptr) { 960 std::string error_msg; 961 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 962 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 963 error_msgs->push_back(error_msg); 964 return false; 965 } 966 967 // Try to load again, but stronger checks. 968 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 969 dex_location_checksum_pointer, 970 true, error_msgs, dex_files); 971 if (success) { 972 RegisterOatFile(open_oat_file.release()); 973 return true; 974 } else { 975 return false; 976 } 977} 978 979const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 980 uint32_t dex_location_checksum, 981 const char* oat_location, 982 std::string* error_msg) { 983 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, nullptr, 984 !Runtime::Current()->IsCompiler(), 985 error_msg)); 986 if (oat_file.get() == nullptr) { 987 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 988 error_msg->c_str()); 989 return nullptr; 990 } 991 Runtime* runtime = Runtime::Current(); 992 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 993 if (image_space != nullptr) { 994 const ImageHeader& image_header = image_space->GetImageHeader(); 995 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 996 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 997 if (expected_image_oat_checksum != actual_image_oat_checksum) { 998 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 999 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 1000 actual_image_oat_checksum); 1001 return nullptr; 1002 } 1003 1004 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1005 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 1006 if (expected_image_oat_offset != actual_image_oat_offset) { 1007 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 1008 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 1009 actual_image_oat_offset); 1010 return nullptr; 1011 } 1012 int32_t expected_patch_delta = image_header.GetPatchDelta(); 1013 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 1014 if (expected_patch_delta != actual_patch_delta) { 1015 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 1016 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 1017 return nullptr; 1018 } 1019 } 1020 1021 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1022 &dex_location_checksum); 1023 if (oat_dex_file == nullptr) { 1024 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 1025 dex_location); 1026 return nullptr; 1027 } 1028 uint32_t expected_dex_checksum = dex_location_checksum; 1029 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 1030 if (expected_dex_checksum != actual_dex_checksum) { 1031 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 1032 "found 0x%x", oat_location, expected_dex_checksum, 1033 actual_dex_checksum); 1034 return nullptr; 1035 } 1036 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 1037 if (dex_file.get() != nullptr) { 1038 return oat_file.release(); 1039 } else { 1040 return nullptr; 1041 } 1042} 1043 1044const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1045 int fd, const char* oat_location, 1046 std::vector<std::string>* error_msgs) { 1047 // Generate the output oat file for the dex file 1048 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1049 std::string error_msg; 1050 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1051 CHECK(!error_msg.empty()); 1052 error_msgs->push_back(error_msg); 1053 return nullptr; 1054 } 1055 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, nullptr, 1056 !Runtime::Current()->IsCompiler(), 1057 &error_msg)); 1058 if (oat_file.get() == nullptr) { 1059 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1060 oat_location, error_msg.c_str()); 1061 error_msgs->push_back(compound_msg); 1062 return nullptr; 1063 } 1064 1065 return oat_file.release(); 1066} 1067 1068bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1069 const InstructionSet instruction_set) { 1070 Runtime* runtime = Runtime::Current(); 1071 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1072 if (image_space == nullptr) { 1073 return false; 1074 } 1075 uint32_t image_oat_checksum = 0; 1076 if (instruction_set == kRuntimeISA) { 1077 const ImageHeader& image_header = image_space->GetImageHeader(); 1078 image_oat_checksum = image_header.GetOatChecksum(); 1079 } else { 1080 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1081 image_space->GetImageLocation().c_str(), instruction_set)); 1082 image_oat_checksum = image_header->GetOatChecksum(); 1083 } 1084 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1085} 1086 1087bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1088 const InstructionSet instruction_set, 1089 std::string* error_msg) { 1090 Runtime* runtime = Runtime::Current(); 1091 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1092 if (image_space == nullptr) { 1093 *error_msg = "No image space for verification against"; 1094 return false; 1095 } 1096 1097 // If the requested instruction set is the same as the current runtime, 1098 // we can use the checksums directly. If it isn't, we'll have to read the 1099 // image header from the image for the right instruction set. 1100 uint32_t image_oat_checksum = 0; 1101 uintptr_t image_oat_data_begin = 0; 1102 int32_t image_patch_delta = 0; 1103 if (instruction_set == runtime->GetInstructionSet()) { 1104 const ImageHeader& image_header = image_space->GetImageHeader(); 1105 image_oat_checksum = image_header.GetOatChecksum(); 1106 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1107 image_patch_delta = image_header.GetPatchDelta(); 1108 } else { 1109 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1110 image_space->GetImageLocation().c_str(), instruction_set)); 1111 image_oat_checksum = image_header->GetOatChecksum(); 1112 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1113 image_patch_delta = image_header->GetPatchDelta(); 1114 } 1115 const OatHeader& oat_header = oat_file->GetOatHeader(); 1116 bool ret = (oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum); 1117 1118 // If the oat file is PIC, it doesn't care if/how image was relocated. Ignore these checks. 1119 if (!oat_file->IsPic()) { 1120 ret = ret && (oat_header.GetImagePatchDelta() == image_patch_delta) 1121 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin); 1122 } 1123 if (!ret) { 1124 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1125 oat_file->GetLocation().c_str(), 1126 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1127 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1128 oat_file->GetOatHeader().GetImagePatchDelta(), 1129 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1130 } 1131 return ret; 1132} 1133 1134bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1135 const char* dex_location, 1136 uint32_t dex_location_checksum, 1137 const InstructionSet instruction_set, 1138 std::string* error_msg) { 1139 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1140 return false; 1141 } 1142 1143 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1144 &dex_location_checksum); 1145 if (oat_dex_file == nullptr) { 1146 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1147 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1148 for (const OatFile::OatDexFile* oat_dex_file : oat_file->GetOatDexFiles()) { 1149 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s' with checksum 0x%x", 1150 oat_file->GetLocation().c_str(), 1151 oat_dex_file->GetDexFileLocation().c_str(), 1152 oat_dex_file->GetDexFileLocationChecksum()); 1153 } 1154 return false; 1155 } 1156 1157 if (dex_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) { 1158 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1159 oat_file->GetLocation().c_str(), 1160 oat_dex_file->GetDexFileLocationChecksum(), 1161 dex_location, dex_location_checksum); 1162 return false; 1163 } 1164 return true; 1165} 1166 1167bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1168 const char* dex_location, 1169 const uint32_t* dex_location_checksum, 1170 std::string* error_msg) { 1171 CHECK(oat_file != nullptr); 1172 CHECK(dex_location != nullptr); 1173 std::unique_ptr<const DexFile> dex_file; 1174 if (dex_location_checksum == nullptr) { 1175 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1176 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1177 // directory. 1178 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, nullptr); 1179 if (oat_dex_file == nullptr) { 1180 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1181 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1182 error_msg->c_str()); 1183 return false; 1184 } 1185 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1186 } else { 1187 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, *dex_location_checksum, 1188 kRuntimeISA, error_msg); 1189 if (!verified) { 1190 return false; 1191 } 1192 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1193 dex_location_checksum)->OpenDexFile(error_msg)); 1194 } 1195 return dex_file.get() != nullptr; 1196} 1197 1198const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1199 const char* dex_location, 1200 const uint32_t* dex_location_checksum, 1201 InstructionSet isa, 1202 std::vector<std::string>* error_msgs, 1203 bool* obsolete_file_cleanup_failed) { 1204 *obsolete_file_cleanup_failed = false; 1205 bool already_opened = false; 1206 std::string dex_location_str(dex_location); 1207 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1208 &already_opened, 1209 obsolete_file_cleanup_failed, 1210 error_msgs)); 1211 std::string error_msg; 1212 if (oat_file.get() == nullptr) { 1213 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1214 dex_location)); 1215 return nullptr; 1216 } else if (oat_file->IsExecutable() && 1217 !VerifyOatWithDexFile(oat_file.get(), dex_location, 1218 dex_location_checksum, &error_msg)) { 1219 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1220 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1221 error_msg.c_str())); 1222 return nullptr; 1223 } else if (!oat_file->IsExecutable() && 1224 Runtime::Current()->GetHeap()->HasImageSpace() && 1225 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1226 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1227 "dex location '%s'. Image checksum incorrect.", 1228 oat_file->GetLocation().c_str(), dex_location)); 1229 return nullptr; 1230 } else { 1231 return oat_file.release(); 1232 } 1233} 1234 1235const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1236 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1237 for (size_t i = 0; i < oat_files_.size(); i++) { 1238 const OatFile* oat_file = oat_files_[i]; 1239 DCHECK(oat_file != nullptr); 1240 if (oat_file->GetLocation() == oat_location) { 1241 return oat_file; 1242 } 1243 } 1244 return nullptr; 1245} 1246 1247const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1248 InstructionSet isa, 1249 bool *already_opened, 1250 bool *obsolete_file_cleanup_failed, 1251 std::vector<std::string>* error_msgs) { 1252 // Find out if we've already opened the file 1253 const OatFile* ret = nullptr; 1254 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1255 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1256 if (ret != nullptr) { 1257 *already_opened = true; 1258 return ret; 1259 } 1260 1261 std::string dalvik_cache; 1262 bool have_android_data = false; 1263 bool have_dalvik_cache = false; 1264 bool is_global_cache = false; 1265 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1266 &have_android_data, &have_dalvik_cache, &is_global_cache); 1267 std::string cache_filename; 1268 if (have_dalvik_cache) { 1269 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1270 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1271 if (ret != nullptr) { 1272 *already_opened = true; 1273 return ret; 1274 } 1275 } else { 1276 // If we need to relocate we should just place odex back where it started. 1277 cache_filename = odex_filename; 1278 } 1279 1280 ret = nullptr; 1281 1282 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1283 // 1284 // Now we do the following: 1285 // 1) Try and open the odex version 1286 // 2) If present, checksum-verified & relocated correctly return it 1287 // 3) Close the odex version to free up its address space. 1288 // 4) Try and open the cache version 1289 // 5) If present, checksum-verified & relocated correctly return it 1290 // 6) Close the cache version to free up its address space. 1291 // 7) If we should relocate: 1292 // a) If we have opened and checksum-verified the odex version relocate it to 1293 // 'cache_filename' and return it 1294 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1295 // it. This should not happen often (I think only the run-test's will hit this case). 1296 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1297 // this point. 1298 // 9) Return nullptr 1299 1300 *already_opened = false; 1301 const Runtime* runtime = Runtime::Current(); 1302 CHECK(runtime != nullptr); 1303 bool executable = !runtime->IsCompiler(); 1304 1305 std::string odex_error_msg; 1306 bool should_patch_system = false; 1307 bool odex_checksum_verified = false; 1308 bool have_system_odex = false; 1309 { 1310 // There is a high probability that both these oat files map similar/the same address 1311 // spaces so we must scope them like this so they each gets its turn. 1312 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, nullptr, 1313 nullptr, 1314 executable, &odex_error_msg)); 1315 if (odex_oat_file.get() != nullptr && CheckOatFile(runtime, odex_oat_file.get(), isa, 1316 &odex_checksum_verified, 1317 &odex_error_msg)) { 1318 error_msgs->push_back(odex_error_msg); 1319 return odex_oat_file.release(); 1320 } else { 1321 if (odex_checksum_verified) { 1322 // We can just relocate 1323 should_patch_system = true; 1324 odex_error_msg = "Image Patches are incorrect"; 1325 } 1326 if (odex_oat_file.get() != nullptr) { 1327 have_system_odex = true; 1328 } 1329 } 1330 } 1331 1332 std::string cache_error_msg; 1333 bool should_patch_cache = false; 1334 bool cache_checksum_verified = false; 1335 if (have_dalvik_cache) { 1336 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, nullptr, 1337 nullptr, 1338 executable, &cache_error_msg)); 1339 if (cache_oat_file.get() != nullptr && CheckOatFile(runtime, cache_oat_file.get(), isa, 1340 &cache_checksum_verified, 1341 &cache_error_msg)) { 1342 error_msgs->push_back(cache_error_msg); 1343 return cache_oat_file.release(); 1344 } else if (cache_checksum_verified) { 1345 // We can just relocate 1346 should_patch_cache = true; 1347 cache_error_msg = "Image Patches are incorrect"; 1348 } 1349 } else if (have_android_data) { 1350 // dalvik_cache does not exist but android data does. This means we should be able to create 1351 // it, so we should try. 1352 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1353 } 1354 1355 ret = nullptr; 1356 std::string error_msg; 1357 if (runtime->CanRelocate()) { 1358 // Run relocation 1359 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1360 if (space != nullptr) { 1361 const std::string& image_location = space->GetImageLocation(); 1362 if (odex_checksum_verified && should_patch_system) { 1363 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1364 } else if (cache_checksum_verified && should_patch_cache) { 1365 CHECK(have_dalvik_cache); 1366 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1367 } 1368 } else if (have_system_odex) { 1369 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1370 } 1371 } 1372 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1373 // implicitly: were able to fine where the cached version is but we were unable to use it, 1374 // either as a destination for relocation or to open a file. We should delete it if it is 1375 // there. 1376 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1377 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1378 "searching for dex file %s: %s", 1379 cache_filename.c_str(), dex_location.c_str(), 1380 strerror(errno)); 1381 error_msgs->push_back(rm_error_msg); 1382 VLOG(class_linker) << rm_error_msg; 1383 // Let the caller know that we couldn't remove the obsolete file. 1384 // This is a good indication that further writes may fail as well. 1385 *obsolete_file_cleanup_failed = true; 1386 } 1387 } 1388 if (ret == nullptr) { 1389 VLOG(class_linker) << error_msg; 1390 error_msgs->push_back(error_msg); 1391 std::string relocation_msg; 1392 if (runtime->CanRelocate()) { 1393 relocation_msg = StringPrintf(" and relocation failed"); 1394 } 1395 if (have_dalvik_cache && cache_checksum_verified) { 1396 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1397 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1398 cache_filename.c_str(), cache_error_msg.c_str(), 1399 relocation_msg.c_str()); 1400 } else { 1401 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1402 "dalvik_cache availible)%s.", odex_filename.c_str(), 1403 odex_error_msg.c_str(), relocation_msg.c_str()); 1404 } 1405 VLOG(class_linker) << error_msg; 1406 error_msgs->push_back(error_msg); 1407 } 1408 return ret; 1409} 1410 1411const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1412 InstructionSet isa, 1413 std::string* error_msg) { 1414 // We open it non-executable 1415 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, nullptr, nullptr, false, error_msg)); 1416 if (output.get() == nullptr) { 1417 return nullptr; 1418 } 1419 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1420 VerifyOatImageChecksum(output.get(), isa)) { 1421 return output.release(); 1422 } else { 1423 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1424 oat_path.c_str()); 1425 return nullptr; 1426 } 1427} 1428 1429const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1430 const std::string& output_oat, 1431 const std::string& image_location, 1432 InstructionSet isa, 1433 std::string* error_msg) { 1434 Runtime* runtime = Runtime::Current(); 1435 DCHECK(runtime != nullptr); 1436 if (!runtime->GetHeap()->HasImageSpace()) { 1437 // We don't have an image space so there is no point in trying to patchoat. 1438 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1439 << "running without an image. Attempting to use oat file for interpretation."; 1440 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1441 } 1442 if (!runtime->IsDex2OatEnabled()) { 1443 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1444 // input_oat but make sure we only do interpretation on it's dex files. 1445 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1446 << "disabled. Attempting to use oat file for interpretation"; 1447 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1448 } 1449 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1450 std::string patchoat(runtime->GetPatchoatExecutable()); 1451 1452 std::string isa_arg("--instruction-set="); 1453 isa_arg += GetInstructionSetString(isa); 1454 std::string input_oat_filename_arg("--input-oat-file="); 1455 input_oat_filename_arg += input_oat; 1456 std::string output_oat_filename_arg("--output-oat-file="); 1457 output_oat_filename_arg += output_oat; 1458 std::string patched_image_arg("--patched-image-location="); 1459 patched_image_arg += image_location; 1460 1461 std::vector<std::string> argv; 1462 argv.push_back(patchoat); 1463 argv.push_back(isa_arg); 1464 argv.push_back(input_oat_filename_arg); 1465 argv.push_back(output_oat_filename_arg); 1466 argv.push_back(patched_image_arg); 1467 1468 std::string command_line(Join(argv, ' ')); 1469 LOG(INFO) << "Relocate Oat File: " << command_line; 1470 bool success = Exec(argv, error_msg); 1471 if (success) { 1472 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, nullptr, nullptr, 1473 !runtime->IsCompiler(), error_msg)); 1474 bool checksum_verified = false; 1475 if (output.get() != nullptr && CheckOatFile(runtime, output.get(), isa, &checksum_verified, 1476 error_msg)) { 1477 return output.release(); 1478 } else if (output.get() != nullptr) { 1479 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1480 "but output file '%s' failed verifcation: %s", 1481 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1482 } else { 1483 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1484 "but was unable to open output file '%s': %s", 1485 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1486 } 1487 } else if (!runtime->IsCompiler()) { 1488 // patchoat failed which means we probably don't have enough room to place the output oat file, 1489 // instead of failing we should just run the interpreter from the dex files in the input oat. 1490 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1491 << "for interpretation. patchoat failure was: " << *error_msg; 1492 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1493 } else { 1494 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1495 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1496 error_msg->c_str()); 1497 } 1498 return nullptr; 1499} 1500 1501bool ClassLinker::CheckOatFile(const Runtime* runtime, const OatFile* oat_file, InstructionSet isa, 1502 bool* checksum_verified, 1503 std::string* error_msg) { 1504 std::string compound_msg("Oat file failed to verify: "); 1505 uint32_t real_image_checksum; 1506 void* real_image_oat_offset; 1507 int32_t real_patch_delta; 1508 const gc::space::ImageSpace* image_space = Runtime::Current()->GetHeap()->GetImageSpace(); 1509 if (image_space == nullptr) { 1510 *error_msg = "No image space present"; 1511 return false; 1512 } 1513 if (isa == Runtime::Current()->GetInstructionSet()) { 1514 const ImageHeader& image_header = image_space->GetImageHeader(); 1515 real_image_checksum = image_header.GetOatChecksum(); 1516 real_image_oat_offset = image_header.GetOatDataBegin(); 1517 real_patch_delta = image_header.GetPatchDelta(); 1518 } else { 1519 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1520 image_space->GetImageLocation().c_str(), isa)); 1521 real_image_checksum = image_header->GetOatChecksum(); 1522 real_image_oat_offset = image_header->GetOatDataBegin(); 1523 real_patch_delta = image_header->GetPatchDelta(); 1524 } 1525 1526 const OatHeader& oat_header = oat_file->GetOatHeader(); 1527 1528 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1529 *checksum_verified = oat_image_checksum == real_image_checksum; 1530 if (!*checksum_verified) { 1531 compound_msg += StringPrintf(" Oat Image Checksum Incorrect (expected 0x%x, recieved 0x%x)", 1532 real_image_checksum, oat_image_checksum); 1533 } 1534 1535 bool offset_verified; 1536 bool patch_delta_verified; 1537 1538 if (!oat_file->IsPic()) { 1539 void* oat_image_oat_offset = 1540 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1541 offset_verified = oat_image_oat_offset == real_image_oat_offset; 1542 if (!offset_verified) { 1543 compound_msg += StringPrintf(" Oat Image oat offset incorrect (expected 0x%p, recieved 0x%p)", 1544 real_image_oat_offset, oat_image_oat_offset); 1545 } 1546 1547 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1548 patch_delta_verified = oat_patch_delta == real_patch_delta; 1549 if (!patch_delta_verified) { 1550 compound_msg += StringPrintf(" Oat image patch delta incorrect (expected 0x%x, recieved 0x%x)", 1551 real_patch_delta, oat_patch_delta); 1552 } 1553 } else { 1554 // If an oat file is PIC, we ignore offset and patching delta. 1555 offset_verified = true; 1556 patch_delta_verified = true; 1557 } 1558 1559 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1560 if (ret) { 1561 *error_msg = compound_msg; 1562 } 1563 return ret; 1564} 1565 1566const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1567 std::string* error_msg) { 1568 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1569 if (oat_file != nullptr) { 1570 return oat_file; 1571 } 1572 1573 return OatFile::Open(oat_location, oat_location, nullptr, nullptr, !Runtime::Current()->IsCompiler(), 1574 error_msg); 1575} 1576 1577static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1578 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1579 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1580 1581 DCHECK(obj != nullptr); 1582 DCHECK(class_linker != nullptr); 1583 1584 if (obj->IsArtMethod()) { 1585 mirror::ArtMethod* method = obj->AsArtMethod(); 1586 if (!method->IsNative()) { 1587 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1588 if (method != Runtime::Current()->GetResolutionMethod()) { 1589 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1590#if defined(ART_USE_PORTABLE_COMPILER) 1591 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1592#endif 1593 } 1594 } 1595 } 1596} 1597 1598void ClassLinker::InitFromImage() { 1599 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1600 CHECK(!init_done_); 1601 1602 Thread* self = Thread::Current(); 1603 gc::Heap* heap = Runtime::Current()->GetHeap(); 1604 gc::space::ImageSpace* space = heap->GetImageSpace(); 1605 dex_cache_image_class_lookup_required_ = true; 1606 CHECK(space != nullptr); 1607 OatFile& oat_file = GetImageOatFile(space); 1608 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1609 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1610 const char* image_file_location = oat_file.GetOatHeader(). 1611 GetStoreValueByKey(OatHeader::kImageLocationKey); 1612 CHECK(image_file_location == nullptr || *image_file_location == 0); 1613 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1614 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1615 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1616 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1617 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1618 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1619 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1620 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1621 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1622 1623 StackHandleScope<1> hs(self); 1624 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1625 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1626 AsObjectArray<mirror::Class>())); 1627 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1628 1629 // Special case of setting up the String class early so that we can test arbitrary objects 1630 // as being Strings or not 1631 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1632 1633 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1634 static_cast<uint32_t>(dex_caches->GetLength())); 1635 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1636 StackHandleScope<1> hs(self); 1637 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1638 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1639 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1640 nullptr); 1641 CHECK(oat_dex_file != nullptr) << oat_file.GetLocation() << " " << dex_file_location; 1642 std::string error_msg; 1643 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1644 if (dex_file == nullptr) { 1645 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1646 << " from within oat file " << oat_file.GetLocation() 1647 << " error '" << error_msg << "'"; 1648 } 1649 1650 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1651 1652 AppendToBootClassPath(*dex_file, dex_cache); 1653 } 1654 1655 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1656 // bitmap walk. 1657 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1658 size_t art_method_object_size = mirror::ArtMethod::GetJavaLangReflectArtMethod()->GetObjectSize(); 1659 if (!Runtime::Current()->IsCompiler()) { 1660 // Compiler supports having an image with a different pointer size than the runtime. This 1661 // happens on the host for compile 32 bit tests since we use a 64 bit libart compiler. We may 1662 // also use 32 bit dex2oat on a system with 64 bit apps. 1663 CHECK_EQ(art_method_object_size, mirror::ArtMethod::InstanceSize(sizeof(void*))) 1664 << sizeof(void*); 1665 } 1666 if (art_method_object_size == mirror::ArtMethod::InstanceSize(4)) { 1667 image_pointer_size_ = 4; 1668 } else { 1669 CHECK_EQ(art_method_object_size, mirror::ArtMethod::InstanceSize(8)); 1670 image_pointer_size_ = 8; 1671 } 1672 1673 // Set entry point to interpreter if in InterpretOnly mode. 1674 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1675 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1676 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1677 } 1678 1679 // reinit class_roots_ 1680 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1681 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1682 1683 // reinit array_iftable_ from any array class instance, they should be == 1684 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1685 DCHECK_EQ(array_iftable_.Read(), GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1686 // String class root was set above 1687 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1688 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1689 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1690 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1691 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1692 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1693 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1694 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1695 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1696 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1697 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1698 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1699 1700 FinishInit(self); 1701 1702 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1703} 1704 1705void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1706 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1707 if ((flags & kVisitRootFlagAllRoots) != 0) { 1708 for (GcRoot<mirror::Class>& root : class_table_) { 1709 root.VisitRoot(callback, arg, 0, kRootStickyClass); 1710 } 1711 for (GcRoot<mirror::Class>& root : pre_zygote_class_table_) { 1712 root.VisitRoot(callback, arg, 0, kRootStickyClass); 1713 } 1714 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1715 for (auto& root : new_class_roots_) { 1716 mirror::Class* old_ref = root.Read<kWithoutReadBarrier>(); 1717 root.VisitRoot(callback, arg, 0, kRootStickyClass); 1718 mirror::Class* new_ref = root.Read<kWithoutReadBarrier>(); 1719 if (UNLIKELY(new_ref != old_ref)) { 1720 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1721 // corresponding object. This is slow, but luckily for us, this may only happen with a 1722 // concurrent moving GC. 1723 auto it = class_table_.Find(GcRoot<mirror::Class>(old_ref)); 1724 class_table_.Erase(it); 1725 class_table_.Insert(GcRoot<mirror::Class>(new_ref)); 1726 } 1727 } 1728 } 1729 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1730 new_class_roots_.clear(); 1731 } 1732 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1733 log_new_class_table_roots_ = true; 1734 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1735 log_new_class_table_roots_ = false; 1736 } 1737 // We deliberately ignore the class roots in the image since we 1738 // handle image roots by using the MS/CMS rescanning of dirty cards. 1739} 1740 1741// Keep in sync with InitCallback. Anything we visit, we need to 1742// reinit references to when reinitializing a ClassLinker from a 1743// mapped image. 1744void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1745 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1746 Thread* self = Thread::Current(); 1747 { 1748 ReaderMutexLock mu(self, dex_lock_); 1749 if ((flags & kVisitRootFlagAllRoots) != 0) { 1750 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1751 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1752 } 1753 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1754 for (size_t index : new_dex_cache_roots_) { 1755 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1756 } 1757 } 1758 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1759 new_dex_cache_roots_.clear(); 1760 } 1761 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1762 log_new_dex_caches_roots_ = true; 1763 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1764 log_new_dex_caches_roots_ = false; 1765 } 1766 } 1767 VisitClassRoots(callback, arg, flags); 1768 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1769 DCHECK(!array_iftable_.IsNull()); 1770 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1771 if (!find_array_class_cache_[i].IsNull()) { 1772 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1773 } 1774 } 1775} 1776 1777void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1778 if (dex_cache_image_class_lookup_required_) { 1779 MoveImageClassesToClassTable(); 1780 } 1781 // TODO: why isn't this a ReaderMutexLock? 1782 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1783 for (GcRoot<mirror::Class>& root : class_table_) { 1784 if (!visitor(root.Read(), arg)) { 1785 return; 1786 } 1787 } 1788 for (GcRoot<mirror::Class>& root : pre_zygote_class_table_) { 1789 if (!visitor(root.Read(), arg)) { 1790 return; 1791 } 1792 } 1793} 1794 1795static bool GetClassesVisitorSet(mirror::Class* c, void* arg) { 1796 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1797 classes->insert(c); 1798 return true; 1799} 1800 1801struct GetClassesVisitorArrayArg { 1802 Handle<mirror::ObjectArray<mirror::Class>>* classes; 1803 int32_t index; 1804 bool success; 1805}; 1806 1807static bool GetClassesVisitorArray(mirror::Class* c, void* varg) 1808 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1809 GetClassesVisitorArrayArg* arg = reinterpret_cast<GetClassesVisitorArrayArg*>(varg); 1810 if (arg->index < (*arg->classes)->GetLength()) { 1811 (*arg->classes)->Set(arg->index, c); 1812 arg->index++; 1813 return true; 1814 } else { 1815 arg->success = false; 1816 return false; 1817 } 1818} 1819 1820void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1821 // TODO: it may be possible to avoid secondary storage if we iterate over dex caches. The problem 1822 // is avoiding duplicates. 1823 if (!kMovingClasses) { 1824 std::set<mirror::Class*> classes; 1825 VisitClasses(GetClassesVisitorSet, &classes); 1826 for (mirror::Class* klass : classes) { 1827 if (!visitor(klass, arg)) { 1828 return; 1829 } 1830 } 1831 } else { 1832 Thread* self = Thread::Current(); 1833 StackHandleScope<1> hs(self); 1834 Handle<mirror::ObjectArray<mirror::Class>> classes = 1835 hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1836 GetClassesVisitorArrayArg local_arg; 1837 local_arg.classes = &classes; 1838 local_arg.success = false; 1839 // We size the array assuming classes won't be added to the class table during the visit. 1840 // If this assumption fails we iterate again. 1841 while (!local_arg.success) { 1842 size_t class_table_size; 1843 { 1844 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1845 class_table_size = class_table_.Size() + pre_zygote_class_table_.Size(); 1846 } 1847 mirror::Class* class_type = mirror::Class::GetJavaLangClass(); 1848 mirror::Class* array_of_class = FindArrayClass(self, &class_type); 1849 classes.Assign( 1850 mirror::ObjectArray<mirror::Class>::Alloc(self, array_of_class, class_table_size)); 1851 CHECK(classes.Get() != nullptr); // OOME. 1852 local_arg.index = 0; 1853 local_arg.success = true; 1854 VisitClasses(GetClassesVisitorArray, &local_arg); 1855 } 1856 for (int32_t i = 0; i < classes->GetLength(); ++i) { 1857 // If the class table shrank during creation of the clases array we expect null elements. If 1858 // the class table grew then the loop repeats. If classes are created after the loop has 1859 // finished then we don't visit. 1860 mirror::Class* klass = classes->Get(i); 1861 if (klass != nullptr && !visitor(klass, arg)) { 1862 return; 1863 } 1864 } 1865 } 1866} 1867 1868ClassLinker::~ClassLinker() { 1869 mirror::Class::ResetClass(); 1870 mirror::String::ResetClass(); 1871 mirror::Reference::ResetClass(); 1872 mirror::ArtField::ResetClass(); 1873 mirror::ArtMethod::ResetClass(); 1874 mirror::BooleanArray::ResetArrayClass(); 1875 mirror::ByteArray::ResetArrayClass(); 1876 mirror::CharArray::ResetArrayClass(); 1877 mirror::DoubleArray::ResetArrayClass(); 1878 mirror::FloatArray::ResetArrayClass(); 1879 mirror::IntArray::ResetArrayClass(); 1880 mirror::LongArray::ResetArrayClass(); 1881 mirror::ShortArray::ResetArrayClass(); 1882 mirror::Throwable::ResetClass(); 1883 mirror::StackTraceElement::ResetClass(); 1884 STLDeleteElements(&boot_class_path_); 1885 STLDeleteElements(&oat_files_); 1886} 1887 1888mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1889 gc::Heap* heap = Runtime::Current()->GetHeap(); 1890 StackHandleScope<16> hs(self); 1891 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1892 Handle<mirror::DexCache> dex_cache( 1893 hs.NewHandle(down_cast<mirror::DexCache*>( 1894 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1895 VoidFunctor())))); 1896 if (dex_cache.Get() == nullptr) { 1897 return nullptr; 1898 } 1899 Handle<mirror::String> 1900 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1901 if (location.Get() == nullptr) { 1902 return nullptr; 1903 } 1904 Handle<mirror::ObjectArray<mirror::String>> 1905 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1906 if (strings.Get() == nullptr) { 1907 return nullptr; 1908 } 1909 Handle<mirror::ObjectArray<mirror::Class>> 1910 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1911 if (types.Get() == nullptr) { 1912 return nullptr; 1913 } 1914 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1915 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1916 if (methods.Get() == nullptr) { 1917 return nullptr; 1918 } 1919 Handle<mirror::ObjectArray<mirror::ArtField>> 1920 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1921 if (fields.Get() == nullptr) { 1922 return nullptr; 1923 } 1924 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1925 fields.Get()); 1926 return dex_cache.Get(); 1927} 1928 1929mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1930 uint32_t class_size) { 1931 DCHECK_GE(class_size, sizeof(mirror::Class)); 1932 gc::Heap* heap = Runtime::Current()->GetHeap(); 1933 mirror::Class::InitializeClassVisitor visitor(class_size); 1934 mirror::Object* k = kMovingClasses ? 1935 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1936 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1937 if (UNLIKELY(k == nullptr)) { 1938 CHECK(self->IsExceptionPending()); // OOME. 1939 return nullptr; 1940 } 1941 return k->AsClass(); 1942} 1943 1944mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1945 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1946} 1947 1948mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1949 return down_cast<mirror::ArtField*>( 1950 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1951} 1952 1953mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1954 return down_cast<mirror::ArtMethod*>( 1955 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1956} 1957 1958mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1959 Thread* self, size_t length) { 1960 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1961 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1962} 1963 1964mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1965 mirror::Class* klass) { 1966 DCHECK(klass != nullptr); 1967 1968 // For temporary classes we must wait for them to be retired. 1969 if (init_done_ && klass->IsTemp()) { 1970 CHECK(!klass->IsResolved()); 1971 if (klass->IsErroneous()) { 1972 ThrowEarlierClassFailure(klass); 1973 return nullptr; 1974 } 1975 StackHandleScope<1> hs(self); 1976 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1977 ObjectLock<mirror::Class> lock(self, h_class); 1978 // Loop and wait for the resolving thread to retire this class. 1979 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1980 lock.WaitIgnoringInterrupts(); 1981 } 1982 if (h_class->IsErroneous()) { 1983 ThrowEarlierClassFailure(h_class.Get()); 1984 return nullptr; 1985 } 1986 CHECK(h_class->IsRetired()); 1987 // Get the updated class from class table. 1988 klass = LookupClass(descriptor, ComputeModifiedUtf8Hash(descriptor), 1989 h_class.Get()->GetClassLoader()); 1990 } 1991 1992 // Wait for the class if it has not already been linked. 1993 if (!klass->IsResolved() && !klass->IsErroneous()) { 1994 StackHandleScope<1> hs(self); 1995 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1996 ObjectLock<mirror::Class> lock(self, h_class); 1997 // Check for circular dependencies between classes. 1998 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1999 ThrowClassCircularityError(h_class.Get()); 2000 h_class->SetStatus(mirror::Class::kStatusError, self); 2001 return nullptr; 2002 } 2003 // Wait for the pending initialization to complete. 2004 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 2005 lock.WaitIgnoringInterrupts(); 2006 } 2007 } 2008 2009 if (klass->IsErroneous()) { 2010 ThrowEarlierClassFailure(klass); 2011 return nullptr; 2012 } 2013 // Return the loaded class. No exceptions should be pending. 2014 CHECK(klass->IsResolved()) << PrettyClass(klass); 2015 self->AssertNoPendingException(); 2016 return klass; 2017} 2018 2019typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry; 2020 2021// Search a collection of DexFiles for a descriptor 2022ClassPathEntry FindInClassPath(const char* descriptor, 2023 size_t hash, const std::vector<const DexFile*>& class_path) { 2024 for (const DexFile* dex_file : class_path) { 2025 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor, hash); 2026 if (dex_class_def != nullptr) { 2027 return ClassPathEntry(dex_file, dex_class_def); 2028 } 2029 } 2030 return ClassPathEntry(nullptr, nullptr); 2031} 2032 2033mirror::Class* ClassLinker::FindClassInPathClassLoader(ScopedObjectAccessAlreadyRunnable& soa, 2034 Thread* self, const char* descriptor, 2035 size_t hash, 2036 Handle<mirror::ClassLoader> class_loader) { 2037 if (class_loader->GetClass() != 2038 soa.Decode<mirror::Class*>(WellKnownClasses::dalvik_system_PathClassLoader) || 2039 class_loader->GetParent()->GetClass() != 2040 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_BootClassLoader)) { 2041 return nullptr; 2042 } 2043 ClassPathEntry pair = FindInClassPath(descriptor, hash, boot_class_path_); 2044 // Check if this would be found in the parent boot class loader. 2045 if (pair.second != nullptr) { 2046 mirror::Class* klass = LookupClass(descriptor, hash, nullptr); 2047 if (klass != nullptr) { 2048 return EnsureResolved(self, descriptor, klass); 2049 } 2050 klass = DefineClass(self, descriptor, hash, NullHandle<mirror::ClassLoader>(), *pair.first, 2051 *pair.second); 2052 if (klass != nullptr) { 2053 return klass; 2054 } 2055 CHECK(self->IsExceptionPending()) << descriptor; 2056 self->ClearException(); 2057 } else { 2058 // RegisterDexFile may allocate dex caches (and cause thread suspension). 2059 StackHandleScope<3> hs(self); 2060 // The class loader is a PathClassLoader which inherits from BaseDexClassLoader. 2061 // We need to get the DexPathList and loop through it. 2062 Handle<mirror::ArtField> cookie_field = 2063 hs.NewHandle(soa.DecodeField(WellKnownClasses::dalvik_system_DexFile_cookie)); 2064 Handle<mirror::ArtField> dex_file_field = 2065 hs.NewHandle( 2066 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList$Element_dexFile)); 2067 mirror::Object* dex_path_list = 2068 soa.DecodeField(WellKnownClasses::dalvik_system_PathClassLoader_pathList)-> 2069 GetObject(class_loader.Get()); 2070 if (dex_path_list != nullptr && dex_file_field.Get() != nullptr && 2071 cookie_field.Get() != nullptr) { 2072 // DexPathList has an array dexElements of Elements[] which each contain a dex file. 2073 mirror::Object* dex_elements_obj = 2074 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList_dexElements)-> 2075 GetObject(dex_path_list); 2076 // Loop through each dalvik.system.DexPathList$Element's dalvik.system.DexFile and look 2077 // at the mCookie which is a DexFile vector. 2078 if (dex_elements_obj != nullptr) { 2079 Handle<mirror::ObjectArray<mirror::Object>> dex_elements = 2080 hs.NewHandle(dex_elements_obj->AsObjectArray<mirror::Object>()); 2081 for (int32_t i = 0; i < dex_elements->GetLength(); ++i) { 2082 mirror::Object* element = dex_elements->GetWithoutChecks(i); 2083 if (element == nullptr) { 2084 // Should never happen, fall back to java code to throw a NPE. 2085 break; 2086 } 2087 mirror::Object* dex_file = dex_file_field->GetObject(element); 2088 if (dex_file != nullptr) { 2089 const uint64_t cookie = cookie_field->GetLong(dex_file); 2090 auto* dex_files = 2091 reinterpret_cast<std::vector<const DexFile*>*>(static_cast<uintptr_t>(cookie)); 2092 if (dex_files == nullptr) { 2093 // This should never happen so log a warning. 2094 LOG(WARNING) << "Null DexFile::mCookie for " << descriptor; 2095 break; 2096 } 2097 for (const DexFile* dex_file : *dex_files) { 2098 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor, hash); 2099 if (dex_class_def != nullptr) { 2100 RegisterDexFile(*dex_file); 2101 mirror::Class* klass = DefineClass(self, descriptor, hash, class_loader, *dex_file, 2102 *dex_class_def); 2103 if (klass == nullptr) { 2104 CHECK(self->IsExceptionPending()) << descriptor; 2105 self->ClearException(); 2106 return nullptr; 2107 } 2108 return klass; 2109 } 2110 } 2111 } 2112 } 2113 } 2114 } 2115 } 2116 return nullptr; 2117} 2118 2119mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 2120 Handle<mirror::ClassLoader> class_loader) { 2121 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 2122 DCHECK(self != nullptr); 2123 self->AssertNoPendingException(); 2124 if (descriptor[1] == '\0') { 2125 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 2126 // for primitive classes that aren't backed by dex files. 2127 return FindPrimitiveClass(descriptor[0]); 2128 } 2129 const size_t hash = ComputeModifiedUtf8Hash(descriptor); 2130 // Find the class in the loaded classes table. 2131 mirror::Class* klass = LookupClass(descriptor, hash, class_loader.Get()); 2132 if (klass != nullptr) { 2133 return EnsureResolved(self, descriptor, klass); 2134 } 2135 // Class is not yet loaded. 2136 if (descriptor[0] == '[') { 2137 return CreateArrayClass(self, descriptor, hash, class_loader); 2138 } else if (class_loader.Get() == nullptr) { 2139 // The boot class loader, search the boot class path. 2140 ClassPathEntry pair = FindInClassPath(descriptor, hash, boot_class_path_); 2141 if (pair.second != nullptr) { 2142 return DefineClass(self, descriptor, hash, NullHandle<mirror::ClassLoader>(), *pair.first, 2143 *pair.second); 2144 } else { 2145 // The boot class loader is searched ahead of the application class loader, failures are 2146 // expected and will be wrapped in a ClassNotFoundException. Use the pre-allocated error to 2147 // trigger the chaining with a proper stack trace. 2148 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2149 self->SetException(ThrowLocation(), pre_allocated); 2150 return nullptr; 2151 } 2152 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 2153 // First try with the bootstrap class loader. 2154 if (class_loader.Get() != nullptr) { 2155 klass = LookupClass(descriptor, hash, nullptr); 2156 if (klass != nullptr) { 2157 return EnsureResolved(self, descriptor, klass); 2158 } 2159 } 2160 // If the lookup failed search the boot class path. We don't perform a recursive call to avoid 2161 // a NoClassDefFoundError being allocated. 2162 ClassPathEntry pair = FindInClassPath(descriptor, hash, boot_class_path_); 2163 if (pair.second != nullptr) { 2164 return DefineClass(self, descriptor, hash, NullHandle<mirror::ClassLoader>(), *pair.first, 2165 *pair.second); 2166 } 2167 // Next try the compile time class path. 2168 const std::vector<const DexFile*>* class_path; 2169 { 2170 ScopedObjectAccessUnchecked soa(self); 2171 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 2172 soa.AddLocalReference<jobject>(class_loader.Get())); 2173 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 2174 } 2175 pair = FindInClassPath(descriptor, hash, *class_path); 2176 if (pair.second != nullptr) { 2177 return DefineClass(self, descriptor, hash, class_loader, *pair.first, *pair.second); 2178 } 2179 } else { 2180 ScopedObjectAccessUnchecked soa(self); 2181 mirror::Class* klass = FindClassInPathClassLoader(soa, self, descriptor, hash, class_loader); 2182 if (klass != nullptr) { 2183 return klass; 2184 } 2185 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 2186 soa.AddLocalReference<jobject>(class_loader.Get())); 2187 std::string class_name_string(DescriptorToDot(descriptor)); 2188 ScopedLocalRef<jobject> result(soa.Env(), nullptr); 2189 { 2190 ScopedThreadStateChange tsc(self, kNative); 2191 ScopedLocalRef<jobject> class_name_object(soa.Env(), 2192 soa.Env()->NewStringUTF(class_name_string.c_str())); 2193 if (class_name_object.get() == nullptr) { 2194 DCHECK(self->IsExceptionPending()); // OOME. 2195 return nullptr; 2196 } 2197 CHECK(class_loader_object.get() != nullptr); 2198 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 2199 WellKnownClasses::java_lang_ClassLoader_loadClass, 2200 class_name_object.get())); 2201 } 2202 if (self->IsExceptionPending()) { 2203 // If the ClassLoader threw, pass that exception up. 2204 return nullptr; 2205 } else if (result.get() == nullptr) { 2206 // broken loader - throw NPE to be compatible with Dalvik 2207 ThrowNullPointerException(nullptr, StringPrintf("ClassLoader.loadClass returned null for %s", 2208 class_name_string.c_str()).c_str()); 2209 return nullptr; 2210 } else { 2211 // success, return mirror::Class* 2212 return soa.Decode<mirror::Class*>(result.get()); 2213 } 2214 } 2215 2216 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 2217 return nullptr; 2218} 2219 2220mirror::Class* ClassLinker::DefineClass(Thread* self, const char* descriptor, size_t hash, 2221 Handle<mirror::ClassLoader> class_loader, 2222 const DexFile& dex_file, 2223 const DexFile::ClassDef& dex_class_def) { 2224 StackHandleScope<3> hs(self); 2225 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2226 2227 // Load the class from the dex file. 2228 if (UNLIKELY(!init_done_)) { 2229 // finish up init of hand crafted class_roots_ 2230 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2231 klass.Assign(GetClassRoot(kJavaLangObject)); 2232 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2233 klass.Assign(GetClassRoot(kJavaLangClass)); 2234 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2235 klass.Assign(GetClassRoot(kJavaLangString)); 2236 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2237 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2238 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2239 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2240 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2241 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2242 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2243 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2244 } 2245 } 2246 2247 if (klass.Get() == nullptr) { 2248 // Allocate a class with the status of not ready. 2249 // Interface object should get the right size here. Regular class will 2250 // figure out the right size later and be replaced with one of the right 2251 // size when the class becomes resolved. 2252 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2253 } 2254 if (UNLIKELY(klass.Get() == nullptr)) { 2255 CHECK(self->IsExceptionPending()); // Expect an OOME. 2256 return nullptr; 2257 } 2258 klass->SetDexCache(FindDexCache(dex_file)); 2259 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 2260 ObjectLock<mirror::Class> lock(self, klass); 2261 if (self->IsExceptionPending()) { 2262 // An exception occured during load, set status to erroneous while holding klass' lock in case 2263 // notification is necessary. 2264 if (!klass->IsErroneous()) { 2265 klass->SetStatus(mirror::Class::kStatusError, self); 2266 } 2267 return nullptr; 2268 } 2269 klass->SetClinitThreadId(self->GetTid()); 2270 2271 // Add the newly loaded class to the loaded classes table. 2272 mirror::Class* existing = InsertClass(descriptor, klass.Get(), hash); 2273 if (existing != nullptr) { 2274 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2275 // this thread to block. 2276 return EnsureResolved(self, descriptor, existing); 2277 } 2278 2279 // Finish loading (if necessary) by finding parents 2280 CHECK(!klass->IsLoaded()); 2281 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2282 // Loading failed. 2283 if (!klass->IsErroneous()) { 2284 klass->SetStatus(mirror::Class::kStatusError, self); 2285 } 2286 return nullptr; 2287 } 2288 CHECK(klass->IsLoaded()); 2289 // Link the class (if necessary) 2290 CHECK(!klass->IsResolved()); 2291 // TODO: Use fast jobjects? 2292 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2293 2294 mirror::Class* new_class = nullptr; 2295 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2296 // Linking failed. 2297 if (!klass->IsErroneous()) { 2298 klass->SetStatus(mirror::Class::kStatusError, self); 2299 } 2300 return nullptr; 2301 } 2302 self->AssertNoPendingException(); 2303 CHECK(new_class != nullptr) << descriptor; 2304 CHECK(new_class->IsResolved()) << descriptor; 2305 2306 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2307 2308 /* 2309 * We send CLASS_PREPARE events to the debugger from here. The 2310 * definition of "preparation" is creating the static fields for a 2311 * class and initializing them to the standard default values, but not 2312 * executing any code (that comes later, during "initialization"). 2313 * 2314 * We did the static preparation in LinkClass. 2315 * 2316 * The class has been prepared and resolved but possibly not yet verified 2317 * at this point. 2318 */ 2319 Dbg::PostClassPrepare(new_class_h.Get()); 2320 2321 return new_class_h.Get(); 2322} 2323 2324uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2325 const DexFile::ClassDef& dex_class_def) { 2326 const byte* class_data = dex_file.GetClassData(dex_class_def); 2327 size_t num_ref = 0; 2328 size_t num_32 = 0; 2329 size_t num_64 = 0; 2330 if (class_data != nullptr) { 2331 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2332 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2333 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2334 char c = descriptor[0]; 2335 if (c == 'L' || c == '[') { 2336 num_ref++; 2337 } else if (c == 'J' || c == 'D') { 2338 num_64++; 2339 } else { 2340 num_32++; 2341 } 2342 } 2343 } 2344 return mirror::Class::ComputeClassSize(false, 0, num_32, num_64, num_ref); 2345} 2346 2347bool ClassLinker::FindOatClass(const DexFile& dex_file, 2348 uint16_t class_def_idx, 2349 OatFile::OatClass* oat_class) { 2350 DCHECK(oat_class != nullptr); 2351 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2352 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 2353 if (oat_dex_file == nullptr) { 2354 return false; 2355 } 2356 *oat_class = oat_dex_file->GetOatClass(class_def_idx); 2357 return true; 2358} 2359 2360static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2361 uint32_t method_idx) { 2362 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2363 const byte* class_data = dex_file.GetClassData(class_def); 2364 CHECK(class_data != nullptr); 2365 ClassDataItemIterator it(dex_file, class_data); 2366 // Skip fields 2367 while (it.HasNextStaticField()) { 2368 it.Next(); 2369 } 2370 while (it.HasNextInstanceField()) { 2371 it.Next(); 2372 } 2373 // Process methods 2374 size_t class_def_method_index = 0; 2375 while (it.HasNextDirectMethod()) { 2376 if (it.GetMemberIndex() == method_idx) { 2377 return class_def_method_index; 2378 } 2379 class_def_method_index++; 2380 it.Next(); 2381 } 2382 while (it.HasNextVirtualMethod()) { 2383 if (it.GetMemberIndex() == method_idx) { 2384 return class_def_method_index; 2385 } 2386 class_def_method_index++; 2387 it.Next(); 2388 } 2389 DCHECK(!it.HasNext()); 2390 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2391 return 0; 2392} 2393 2394bool ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, OatFile::OatMethod* oat_method) { 2395 DCHECK(oat_method != nullptr); 2396 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2397 // method for direct methods (or virtual methods made direct). 2398 mirror::Class* declaring_class = method->GetDeclaringClass(); 2399 size_t oat_method_index; 2400 if (method->IsStatic() || method->IsDirect()) { 2401 // Simple case where the oat method index was stashed at load time. 2402 oat_method_index = method->GetMethodIndex(); 2403 } else { 2404 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2405 // by search for its position in the declared virtual methods. 2406 oat_method_index = declaring_class->NumDirectMethods(); 2407 size_t end = declaring_class->NumVirtualMethods(); 2408 bool found = false; 2409 for (size_t i = 0; i < end; i++) { 2410 // Check method index instead of identity in case of duplicate method definitions. 2411 if (method->GetDexMethodIndex() == 2412 declaring_class->GetVirtualMethod(i)->GetDexMethodIndex()) { 2413 found = true; 2414 break; 2415 } 2416 oat_method_index++; 2417 } 2418 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2419 } 2420 DCHECK_EQ(oat_method_index, 2421 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2422 method->GetDeclaringClass()->GetDexClassDefIndex(), 2423 method->GetDexMethodIndex())); 2424 OatFile::OatClass oat_class; 2425 if (!FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2426 declaring_class->GetDexClassDefIndex(), 2427 &oat_class)) { 2428 return false; 2429 } 2430 2431 *oat_method = oat_class.GetOatMethod(oat_method_index); 2432 return true; 2433} 2434 2435// Special case to get oat code without overwriting a trampoline. 2436const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2437 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2438 if (method->IsProxyMethod()) { 2439 return GetQuickProxyInvokeHandler(); 2440 } 2441 OatFile::OatMethod oat_method; 2442 const void* result = nullptr; 2443 if (FindOatMethodFor(method, &oat_method)) { 2444 result = oat_method.GetQuickCode(); 2445 } 2446 2447 if (result == nullptr) { 2448 if (method->IsNative()) { 2449 // No code and native? Use generic trampoline. 2450 result = GetQuickGenericJniTrampoline(); 2451#if defined(ART_USE_PORTABLE_COMPILER) 2452 } else if (method->IsPortableCompiled()) { 2453 // No code? Do we expect portable code? 2454 result = GetQuickToPortableBridge(); 2455#endif 2456 } else { 2457 // No code? You must mean to go into the interpreter. 2458 result = GetQuickToInterpreterBridge(); 2459 } 2460 } 2461 return result; 2462} 2463 2464#if defined(ART_USE_PORTABLE_COMPILER) 2465const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2466 bool* have_portable_code) { 2467 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2468 *have_portable_code = false; 2469 if (method->IsProxyMethod()) { 2470 return GetPortableProxyInvokeHandler(); 2471 } 2472 OatFile::OatMethod oat_method; 2473 const void* result = nullptr; 2474 const void* quick_code = nullptr; 2475 if (FindOatMethodFor(method, &oat_method)) { 2476 result = oat_method.GetPortableCode(); 2477 quick_code = oat_method.GetQuickCode(); 2478 } 2479 2480 if (result == nullptr) { 2481 if (quick_code == nullptr) { 2482 // No code? You must mean to go into the interpreter. 2483 result = GetPortableToInterpreterBridge(); 2484 } else { 2485 // No code? But there's quick code, so use a bridge. 2486 result = GetPortableToQuickBridge(); 2487 } 2488 } else { 2489 *have_portable_code = true; 2490 } 2491 return result; 2492} 2493#endif 2494 2495const void* ClassLinker::GetOatMethodQuickCodeFor(mirror::ArtMethod* method) { 2496 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2497 return nullptr; 2498 } 2499 OatFile::OatMethod oat_method; 2500 bool found = FindOatMethodFor(method, &oat_method); 2501 return found ? oat_method.GetQuickCode() : nullptr; 2502} 2503 2504const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2505 uint32_t method_idx) { 2506 OatFile::OatClass oat_class; 2507 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2508 return nullptr; 2509 } 2510 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2511 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2512} 2513 2514#if defined(ART_USE_PORTABLE_COMPILER) 2515const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2516 uint32_t method_idx) { 2517 OatFile::OatClass oat_class; 2518 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2519 return nullptr; 2520 } 2521 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2522 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2523} 2524#endif 2525 2526// Returns true if the method must run with interpreter, false otherwise. 2527static bool NeedsInterpreter( 2528 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2529 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2530 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2531 // No code: need interpreter. 2532 // May return true for native code, in the case of generic JNI 2533 // DCHECK(!method->IsNative()); 2534 return true; 2535 } 2536#ifdef ART_SEA_IR_MODE 2537 ScopedObjectAccess soa(Thread::Current()); 2538 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2539 LOG(INFO) << "Found " << PrettyMethod(method); 2540 return false; 2541 } 2542#endif 2543 // If interpreter mode is enabled, every method (except native and proxy) must 2544 // be run with interpreter. 2545 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2546 !method->IsNative() && !method->IsProxyMethod(); 2547} 2548 2549void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2550 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2551 if (klass->NumDirectMethods() == 0) { 2552 return; // No direct methods => no static methods. 2553 } 2554 Runtime* runtime = Runtime::Current(); 2555 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2556 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2557 return; // OAT file unavailable. 2558 } 2559 } 2560 2561 const DexFile& dex_file = klass->GetDexFile(); 2562 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2563 CHECK(dex_class_def != nullptr); 2564 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2565 // There should always be class data if there were direct methods. 2566 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2567 ClassDataItemIterator it(dex_file, class_data); 2568 // Skip fields 2569 while (it.HasNextStaticField()) { 2570 it.Next(); 2571 } 2572 while (it.HasNextInstanceField()) { 2573 it.Next(); 2574 } 2575 OatFile::OatClass oat_class; 2576 bool has_oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class); 2577 // Link the code of methods skipped by LinkCode. 2578 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2579 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2580 if (!method->IsStatic()) { 2581 // Only update static methods. 2582 continue; 2583 } 2584 const void* portable_code = nullptr; 2585 const void* quick_code = nullptr; 2586 if (has_oat_class) { 2587 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2588 portable_code = oat_method.GetPortableCode(); 2589 quick_code = oat_method.GetQuickCode(); 2590 } 2591 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2592 bool have_portable_code = false; 2593 if (enter_interpreter) { 2594 // Use interpreter entry point. 2595 // Check whether the method is native, in which case it's generic JNI. 2596 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2597 quick_code = GetQuickGenericJniTrampoline(); 2598#if defined(ART_USE_PORTABLE_COMPILER) 2599 portable_code = GetPortableToQuickBridge(); 2600#endif 2601 } else { 2602#if defined(ART_USE_PORTABLE_COMPILER) 2603 portable_code = GetPortableToInterpreterBridge(); 2604#endif 2605 quick_code = GetQuickToInterpreterBridge(); 2606 } 2607 } else { 2608#if defined(ART_USE_PORTABLE_COMPILER) 2609 if (portable_code == nullptr) { 2610 portable_code = GetPortableToQuickBridge(); 2611 } else { 2612 have_portable_code = true; 2613 } 2614 if (quick_code == nullptr) { 2615 quick_code = GetQuickToPortableBridge(); 2616 } 2617#else 2618 if (quick_code == nullptr) { 2619 quick_code = GetQuickToInterpreterBridge(); 2620 } 2621#endif 2622 } 2623 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2624 have_portable_code); 2625 } 2626 // Ignore virtual methods on the iterator. 2627} 2628 2629void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 2630 const DexFile& dex_file, uint32_t dex_method_index, 2631 uint32_t method_index) { 2632 if (Runtime::Current()->IsCompiler()) { 2633 // The following code only applies to a non-compiler runtime. 2634 return; 2635 } 2636 // Method shouldn't have already been linked. 2637 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2638#if defined(ART_USE_PORTABLE_COMPILER) 2639 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2640#endif 2641 if (oat_class != nullptr) { 2642 // Every kind of method should at least get an invoke stub from the oat_method. 2643 // non-abstract methods also get their code pointers. 2644 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2645 oat_method.LinkMethod(method.Get()); 2646 } 2647 2648 // Install entry point from interpreter. 2649 bool enter_interpreter = NeedsInterpreter(method.Get(), 2650 method->GetEntryPointFromQuickCompiledCode(), 2651#if defined(ART_USE_PORTABLE_COMPILER) 2652 method->GetEntryPointFromPortableCompiledCode()); 2653#else 2654 nullptr); 2655#endif 2656 if (enter_interpreter && !method->IsNative()) { 2657 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2658 } else { 2659 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2660 } 2661 2662 if (method->IsAbstract()) { 2663 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2664#if defined(ART_USE_PORTABLE_COMPILER) 2665 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2666#endif 2667 return; 2668 } 2669 2670 bool have_portable_code = false; 2671 if (method->IsStatic() && !method->IsConstructor()) { 2672 // For static methods excluding the class initializer, install the trampoline. 2673 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2674 // after initializing class (see ClassLinker::InitializeClass method). 2675 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2676#if defined(ART_USE_PORTABLE_COMPILER) 2677 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2678#endif 2679 } else if (enter_interpreter) { 2680 if (!method->IsNative()) { 2681 // Set entry point from compiled code if there's no code or in interpreter only mode. 2682 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2683#if defined(ART_USE_PORTABLE_COMPILER) 2684 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2685#endif 2686 } else { 2687 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2688#if defined(ART_USE_PORTABLE_COMPILER) 2689 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2690#endif 2691 } 2692#if defined(ART_USE_PORTABLE_COMPILER) 2693 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2694 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2695 have_portable_code = true; 2696 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2697#endif 2698 } else { 2699 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2700#if defined(ART_USE_PORTABLE_COMPILER) 2701 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2702#endif 2703 } 2704 2705 if (method->IsNative()) { 2706 // Unregistering restores the dlsym lookup stub. 2707 method->UnregisterNative(Thread::Current()); 2708 2709 if (enter_interpreter) { 2710 // We have a native method here without code. Then it should have either the GenericJni 2711 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2712 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2713 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2714 } 2715 } 2716 2717 // Allow instrumentation its chance to hijack code. 2718 Runtime* runtime = Runtime::Current(); 2719 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2720 method->GetEntryPointFromQuickCompiledCode(), 2721#if defined(ART_USE_PORTABLE_COMPILER) 2722 method->GetEntryPointFromPortableCompiledCode(), 2723#else 2724 nullptr, 2725#endif 2726 have_portable_code); 2727} 2728 2729void ClassLinker::LoadClass(const DexFile& dex_file, 2730 const DexFile::ClassDef& dex_class_def, 2731 Handle<mirror::Class> klass, 2732 mirror::ClassLoader* class_loader) { 2733 CHECK(klass.Get() != nullptr); 2734 CHECK(klass->GetDexCache() != nullptr); 2735 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2736 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2737 CHECK(descriptor != nullptr); 2738 2739 klass->SetClass(GetClassRoot(kJavaLangClass)); 2740 if (kUseBakerOrBrooksReadBarrier) { 2741 klass->AssertReadBarrierPointer(); 2742 } 2743 uint32_t access_flags = dex_class_def.GetJavaAccessFlags(); 2744 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2745 klass->SetAccessFlags(access_flags); 2746 klass->SetClassLoader(class_loader); 2747 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2748 klass->SetStatus(mirror::Class::kStatusIdx, nullptr); 2749 2750 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2751 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2752 CHECK(klass->GetDexCacheStrings() != nullptr); 2753 2754 const byte* class_data = dex_file.GetClassData(dex_class_def); 2755 if (class_data == nullptr) { 2756 return; // no fields or methods - for example a marker interface 2757 } 2758 2759 OatFile::OatClass oat_class; 2760 if (Runtime::Current()->IsStarted() 2761 && !Runtime::Current()->UseCompileTimeClassPath() 2762 && FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class)) { 2763 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2764 } else { 2765 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2766 } 2767} 2768 2769void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2770 const byte* class_data, 2771 Handle<mirror::Class> klass, 2772 mirror::ClassLoader* class_loader, 2773 const OatFile::OatClass* oat_class) { 2774 // Load fields. 2775 ClassDataItemIterator it(dex_file, class_data); 2776 Thread* self = Thread::Current(); 2777 if (it.NumStaticFields() != 0) { 2778 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2779 if (UNLIKELY(statics == nullptr)) { 2780 CHECK(self->IsExceptionPending()); // OOME. 2781 return; 2782 } 2783 klass->SetSFields(statics); 2784 } 2785 if (it.NumInstanceFields() != 0) { 2786 mirror::ObjectArray<mirror::ArtField>* fields = 2787 AllocArtFieldArray(self, it.NumInstanceFields()); 2788 if (UNLIKELY(fields == nullptr)) { 2789 CHECK(self->IsExceptionPending()); // OOME. 2790 return; 2791 } 2792 klass->SetIFields(fields); 2793 } 2794 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2795 StackHandleScope<1> hs(self); 2796 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2797 if (UNLIKELY(sfield.Get() == nullptr)) { 2798 CHECK(self->IsExceptionPending()); // OOME. 2799 return; 2800 } 2801 klass->SetStaticField(i, sfield.Get()); 2802 LoadField(dex_file, it, klass, sfield); 2803 } 2804 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2805 StackHandleScope<1> hs(self); 2806 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2807 if (UNLIKELY(ifield.Get() == nullptr)) { 2808 CHECK(self->IsExceptionPending()); // OOME. 2809 return; 2810 } 2811 klass->SetInstanceField(i, ifield.Get()); 2812 LoadField(dex_file, it, klass, ifield); 2813 } 2814 2815 // Load methods. 2816 if (it.NumDirectMethods() != 0) { 2817 // TODO: append direct methods to class object 2818 mirror::ObjectArray<mirror::ArtMethod>* directs = 2819 AllocArtMethodArray(self, it.NumDirectMethods()); 2820 if (UNLIKELY(directs == nullptr)) { 2821 CHECK(self->IsExceptionPending()); // OOME. 2822 return; 2823 } 2824 klass->SetDirectMethods(directs); 2825 } 2826 if (it.NumVirtualMethods() != 0) { 2827 // TODO: append direct methods to class object 2828 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2829 AllocArtMethodArray(self, it.NumVirtualMethods()); 2830 if (UNLIKELY(virtuals == nullptr)) { 2831 CHECK(self->IsExceptionPending()); // OOME. 2832 return; 2833 } 2834 klass->SetVirtualMethods(virtuals); 2835 } 2836 size_t class_def_method_index = 0; 2837 uint32_t last_dex_method_index = DexFile::kDexNoIndex; 2838 size_t last_class_def_method_index = 0; 2839 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2840 StackHandleScope<1> hs(self); 2841 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2842 if (UNLIKELY(method.Get() == nullptr)) { 2843 CHECK(self->IsExceptionPending()); // OOME. 2844 return; 2845 } 2846 klass->SetDirectMethod(i, method.Get()); 2847 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2848 uint32_t it_method_index = it.GetMemberIndex(); 2849 if (last_dex_method_index == it_method_index) { 2850 // duplicate case 2851 method->SetMethodIndex(last_class_def_method_index); 2852 } else { 2853 method->SetMethodIndex(class_def_method_index); 2854 last_dex_method_index = it_method_index; 2855 last_class_def_method_index = class_def_method_index; 2856 } 2857 class_def_method_index++; 2858 } 2859 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2860 StackHandleScope<1> hs(self); 2861 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2862 if (UNLIKELY(method.Get() == nullptr)) { 2863 CHECK(self->IsExceptionPending()); // OOME. 2864 return; 2865 } 2866 klass->SetVirtualMethod(i, method.Get()); 2867 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2868 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2869 class_def_method_index++; 2870 } 2871 DCHECK(!it.HasNext()); 2872} 2873 2874void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2875 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2876 uint32_t field_idx = it.GetMemberIndex(); 2877 dst->SetDexFieldIndex(field_idx); 2878 dst->SetDeclaringClass(klass.Get()); 2879 dst->SetAccessFlags(it.GetFieldAccessFlags()); 2880} 2881 2882mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2883 const ClassDataItemIterator& it, 2884 Handle<mirror::Class> klass) { 2885 uint32_t dex_method_idx = it.GetMemberIndex(); 2886 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2887 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2888 2889 mirror::ArtMethod* dst = AllocArtMethod(self); 2890 if (UNLIKELY(dst == nullptr)) { 2891 CHECK(self->IsExceptionPending()); // OOME. 2892 return nullptr; 2893 } 2894 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2895 2896 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2897 dst->SetDexMethodIndex(dex_method_idx); 2898 dst->SetDeclaringClass(klass.Get()); 2899 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2900 2901 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2902 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2903 2904 uint32_t access_flags = it.GetMethodAccessFlags(); 2905 2906 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2907 // Set finalizable flag on declaring class. 2908 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2909 // Void return type. 2910 if (klass->GetClassLoader() != nullptr) { // All non-boot finalizer methods are flagged. 2911 klass->SetFinalizable(); 2912 } else { 2913 std::string temp; 2914 const char* klass_descriptor = klass->GetDescriptor(&temp); 2915 // The Enum class declares a "final" finalize() method to prevent subclasses from 2916 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2917 // subclasses, so we exclude it here. 2918 // We also want to avoid setting the flag on Object, where we know that finalize() is 2919 // empty. 2920 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2921 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2922 klass->SetFinalizable(); 2923 } 2924 } 2925 } 2926 } else if (method_name[0] == '<') { 2927 // Fix broken access flags for initializers. Bug 11157540. 2928 bool is_init = (strcmp("<init>", method_name) == 0); 2929 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2930 if (UNLIKELY(!is_init && !is_clinit)) { 2931 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2932 } else { 2933 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2934 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2935 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2936 access_flags |= kAccConstructor; 2937 } 2938 } 2939 } 2940 dst->SetAccessFlags(access_flags); 2941 2942 self->EndAssertNoThreadSuspension(old_cause); 2943 return dst; 2944} 2945 2946void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2947 Thread* self = Thread::Current(); 2948 StackHandleScope<1> hs(self); 2949 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2950 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 2951 << dex_file.GetLocation(); 2952 AppendToBootClassPath(dex_file, dex_cache); 2953} 2954 2955void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2956 Handle<mirror::DexCache> dex_cache) { 2957 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 2958 boot_class_path_.push_back(&dex_file); 2959 RegisterDexFile(dex_file, dex_cache); 2960} 2961 2962bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2963 dex_lock_.AssertSharedHeld(Thread::Current()); 2964 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2965 mirror::DexCache* dex_cache = GetDexCache(i); 2966 if (dex_cache->GetDexFile() == &dex_file) { 2967 return true; 2968 } 2969 } 2970 return false; 2971} 2972 2973bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2974 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2975 return IsDexFileRegisteredLocked(dex_file); 2976} 2977 2978void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2979 Handle<mirror::DexCache> dex_cache) { 2980 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2981 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 2982 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2983 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2984 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2985 dex_cache->SetDexFile(&dex_file); 2986 if (log_new_dex_caches_roots_) { 2987 // TODO: This is not safe if we can remove dex caches. 2988 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2989 } 2990} 2991 2992void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2993 Thread* self = Thread::Current(); 2994 { 2995 ReaderMutexLock mu(self, dex_lock_); 2996 if (IsDexFileRegisteredLocked(dex_file)) { 2997 return; 2998 } 2999 } 3000 // Don't alloc while holding the lock, since allocation may need to 3001 // suspend all threads and another thread may need the dex_lock_ to 3002 // get to a suspend point. 3003 StackHandleScope<1> hs(self); 3004 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 3005 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 3006 << dex_file.GetLocation(); 3007 { 3008 WriterMutexLock mu(self, dex_lock_); 3009 if (IsDexFileRegisteredLocked(dex_file)) { 3010 return; 3011 } 3012 RegisterDexFileLocked(dex_file, dex_cache); 3013 } 3014} 3015 3016void ClassLinker::RegisterDexFile(const DexFile& dex_file, 3017 Handle<mirror::DexCache> dex_cache) { 3018 WriterMutexLock mu(Thread::Current(), dex_lock_); 3019 RegisterDexFileLocked(dex_file, dex_cache); 3020} 3021 3022mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 3023 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3024 // Search assuming unique-ness of dex file. 3025 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3026 mirror::DexCache* dex_cache = GetDexCache(i); 3027 if (dex_cache->GetDexFile() == &dex_file) { 3028 return dex_cache; 3029 } 3030 } 3031 // Search matching by location name. 3032 std::string location(dex_file.GetLocation()); 3033 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3034 mirror::DexCache* dex_cache = GetDexCache(i); 3035 if (dex_cache->GetDexFile()->GetLocation() == location) { 3036 return dex_cache; 3037 } 3038 } 3039 // Failure, dump diagnostic and abort. 3040 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3041 mirror::DexCache* dex_cache = GetDexCache(i); 3042 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 3043 } 3044 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 3045 return nullptr; 3046} 3047 3048void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 3049 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3050 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3051 mirror::DexCache* dex_cache = GetDexCache(i); 3052 dex_cache->Fixup(resolution_method); 3053 } 3054} 3055 3056mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 3057 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 3058 if (UNLIKELY(klass == nullptr)) { 3059 return nullptr; 3060 } 3061 return InitializePrimitiveClass(klass, type); 3062} 3063 3064mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 3065 Primitive::Type type) { 3066 CHECK(primitive_class != nullptr); 3067 // Must hold lock on object when initializing. 3068 Thread* self = Thread::Current(); 3069 StackHandleScope<1> hs(self); 3070 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 3071 ObjectLock<mirror::Class> lock(self, h_class); 3072 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 3073 primitive_class->SetPrimitiveType(type); 3074 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 3075 const char* descriptor = Primitive::Descriptor(type); 3076 mirror::Class* existing = InsertClass(descriptor, primitive_class, 3077 ComputeModifiedUtf8Hash(descriptor)); 3078 CHECK(existing == nullptr) << "InitPrimitiveClass(" << type << ") failed"; 3079 return primitive_class; 3080} 3081 3082// Create an array class (i.e. the class object for the array, not the 3083// array itself). "descriptor" looks like "[C" or "[[[[B" or 3084// "[Ljava/lang/String;". 3085// 3086// If "descriptor" refers to an array of primitives, look up the 3087// primitive type's internally-generated class object. 3088// 3089// "class_loader" is the class loader of the class that's referring to 3090// us. It's used to ensure that we're looking for the element type in 3091// the right context. It does NOT become the class loader for the 3092// array class; that always comes from the base element class. 3093// 3094// Returns nullptr with an exception raised on failure. 3095mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, size_t hash, 3096 Handle<mirror::ClassLoader> class_loader) { 3097 // Identify the underlying component type 3098 CHECK_EQ('[', descriptor[0]); 3099 StackHandleScope<2> hs(self); 3100 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 3101 if (component_type.Get() == nullptr) { 3102 DCHECK(self->IsExceptionPending()); 3103 // We need to accept erroneous classes as component types. 3104 const size_t component_hash = ComputeModifiedUtf8Hash(descriptor + 1); 3105 component_type.Assign(LookupClass(descriptor + 1, component_hash, class_loader.Get())); 3106 if (component_type.Get() == nullptr) { 3107 DCHECK(self->IsExceptionPending()); 3108 return nullptr; 3109 } else { 3110 self->ClearException(); 3111 } 3112 } 3113 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 3114 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 3115 return nullptr; 3116 } 3117 // See if the component type is already loaded. Array classes are 3118 // always associated with the class loader of their underlying 3119 // element type -- an array of Strings goes with the loader for 3120 // java/lang/String -- so we need to look for it there. (The 3121 // caller should have checked for the existence of the class 3122 // before calling here, but they did so with *their* class loader, 3123 // not the component type's loader.) 3124 // 3125 // If we find it, the caller adds "loader" to the class' initiating 3126 // loader list, which should prevent us from going through this again. 3127 // 3128 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 3129 // are the same, because our caller (FindClass) just did the 3130 // lookup. (Even if we get this wrong we still have correct behavior, 3131 // because we effectively do this lookup again when we add the new 3132 // class to the hash table --- necessary because of possible races with 3133 // other threads.) 3134 if (class_loader.Get() != component_type->GetClassLoader()) { 3135 mirror::Class* new_class = LookupClass(descriptor, hash, component_type->GetClassLoader()); 3136 if (new_class != nullptr) { 3137 return new_class; 3138 } 3139 } 3140 3141 // Fill out the fields in the Class. 3142 // 3143 // It is possible to execute some methods against arrays, because 3144 // all arrays are subclasses of java_lang_Object_, so we need to set 3145 // up a vtable. We can just point at the one in java_lang_Object_. 3146 // 3147 // Array classes are simple enough that we don't need to do a full 3148 // link step. 3149 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 3150 if (UNLIKELY(!init_done_)) { 3151 // Classes that were hand created, ie not by FindSystemClass 3152 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 3153 new_class.Assign(GetClassRoot(kClassArrayClass)); 3154 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 3155 new_class.Assign(GetClassRoot(kObjectArrayClass)); 3156 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 3157 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 3158 } else if (strcmp(descriptor, 3159 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 3160 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 3161 } else if (strcmp(descriptor, 3162 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 3163 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 3164 } else if (strcmp(descriptor, "[C") == 0) { 3165 new_class.Assign(GetClassRoot(kCharArrayClass)); 3166 } else if (strcmp(descriptor, "[I") == 0) { 3167 new_class.Assign(GetClassRoot(kIntArrayClass)); 3168 } 3169 } 3170 if (new_class.Get() == nullptr) { 3171 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 3172 if (new_class.Get() == nullptr) { 3173 return nullptr; 3174 } 3175 new_class->SetComponentType(component_type.Get()); 3176 } 3177 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 3178 DCHECK(new_class->GetComponentType() != nullptr); 3179 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 3180 new_class->SetSuperClass(java_lang_Object); 3181 new_class->SetVTable(java_lang_Object->GetVTable()); 3182 new_class->SetPrimitiveType(Primitive::kPrimNot); 3183 new_class->SetClassLoader(component_type->GetClassLoader()); 3184 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 3185 { 3186 StackHandleScope<mirror::Class::kImtSize> hs(self, 3187 Runtime::Current()->GetImtUnimplementedMethod()); 3188 new_class->PopulateEmbeddedImtAndVTable(&hs); 3189 } 3190 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 3191 // don't need to set new_class->SetObjectSize(..) 3192 // because Object::SizeOf delegates to Array::SizeOf 3193 3194 3195 // All arrays have java/lang/Cloneable and java/io/Serializable as 3196 // interfaces. We need to set that up here, so that stuff like 3197 // "instanceof" works right. 3198 // 3199 // Note: The GC could run during the call to FindSystemClass, 3200 // so we need to make sure the class object is GC-valid while we're in 3201 // there. Do this by clearing the interface list so the GC will just 3202 // think that the entries are null. 3203 3204 3205 // Use the single, global copies of "interfaces" and "iftable" 3206 // (remember not to free them for arrays). 3207 { 3208 mirror::IfTable* array_iftable = array_iftable_.Read(); 3209 CHECK(array_iftable != nullptr); 3210 new_class->SetIfTable(array_iftable); 3211 } 3212 3213 // Inherit access flags from the component type. 3214 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 3215 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 3216 access_flags &= kAccJavaFlagsMask; 3217 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 3218 // and remove "interface". 3219 access_flags |= kAccAbstract | kAccFinal; 3220 access_flags &= ~kAccInterface; 3221 3222 new_class->SetAccessFlags(access_flags); 3223 3224 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), hash); 3225 if (existing == nullptr) { 3226 return new_class.Get(); 3227 } 3228 // Another thread must have loaded the class after we 3229 // started but before we finished. Abandon what we've 3230 // done. 3231 // 3232 // (Yes, this happens.) 3233 3234 return existing; 3235} 3236 3237mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 3238 switch (type) { 3239 case 'B': 3240 return GetClassRoot(kPrimitiveByte); 3241 case 'C': 3242 return GetClassRoot(kPrimitiveChar); 3243 case 'D': 3244 return GetClassRoot(kPrimitiveDouble); 3245 case 'F': 3246 return GetClassRoot(kPrimitiveFloat); 3247 case 'I': 3248 return GetClassRoot(kPrimitiveInt); 3249 case 'J': 3250 return GetClassRoot(kPrimitiveLong); 3251 case 'S': 3252 return GetClassRoot(kPrimitiveShort); 3253 case 'Z': 3254 return GetClassRoot(kPrimitiveBoolean); 3255 case 'V': 3256 return GetClassRoot(kPrimitiveVoid); 3257 default: 3258 break; 3259 } 3260 std::string printable_type(PrintableChar(type)); 3261 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 3262 return nullptr; 3263} 3264 3265mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 3266 size_t hash) { 3267 if (VLOG_IS_ON(class_linker)) { 3268 mirror::DexCache* dex_cache = klass->GetDexCache(); 3269 std::string source; 3270 if (dex_cache != nullptr) { 3271 source += " from "; 3272 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3273 } 3274 LOG(INFO) << "Loaded class " << descriptor << source; 3275 } 3276 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3277 mirror::Class* existing = LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3278 if (existing != nullptr) { 3279 return existing; 3280 } 3281 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == nullptr && 3282 dex_cache_image_class_lookup_required_) { 3283 // Check a class loaded with the system class loader matches one in the image if the class 3284 // is in the image. 3285 existing = LookupClassFromImage(descriptor); 3286 if (existing != nullptr) { 3287 CHECK_EQ(klass, existing); 3288 } 3289 } 3290 VerifyObject(klass); 3291 class_table_.InsertWithHash(GcRoot<mirror::Class>(klass), hash); 3292 if (log_new_class_table_roots_) { 3293 new_class_roots_.push_back(GcRoot<mirror::Class>(klass)); 3294 } 3295 return nullptr; 3296} 3297 3298mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3299 size_t hash) { 3300 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3301 auto existing_it = class_table_.FindWithHash(std::make_pair(descriptor, klass->GetClassLoader()), 3302 hash); 3303 if (existing_it == class_table_.end()) { 3304 CHECK(klass->IsProxyClass()); 3305 return nullptr; 3306 } 3307 3308 mirror::Class* existing = existing_it->Read(); 3309 CHECK_NE(existing, klass) << descriptor; 3310 CHECK(!existing->IsResolved()) << descriptor; 3311 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3312 3313 CHECK(!klass->IsTemp()) << descriptor; 3314 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3315 dex_cache_image_class_lookup_required_) { 3316 // Check a class loaded with the system class loader matches one in the image if the class 3317 // is in the image. 3318 existing = LookupClassFromImage(descriptor); 3319 if (existing != nullptr) { 3320 CHECK_EQ(klass, existing) << descriptor; 3321 } 3322 } 3323 VerifyObject(klass); 3324 3325 // Update the element in the hash set. 3326 *existing_it = GcRoot<mirror::Class>(klass); 3327 if (log_new_class_table_roots_) { 3328 new_class_roots_.push_back(GcRoot<mirror::Class>(klass)); 3329 } 3330 3331 return existing; 3332} 3333 3334bool ClassLinker::RemoveClass(const char* descriptor, mirror::ClassLoader* class_loader) { 3335 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3336 auto pair = std::make_pair(descriptor, class_loader); 3337 auto it = class_table_.Find(pair); 3338 if (it != class_table_.end()) { 3339 class_table_.Erase(it); 3340 return true; 3341 } 3342 it = pre_zygote_class_table_.Find(pair); 3343 if (it != pre_zygote_class_table_.end()) { 3344 pre_zygote_class_table_.Erase(it); 3345 return true; 3346 } 3347 return false; 3348} 3349 3350mirror::Class* ClassLinker::LookupClass(const char* descriptor, size_t hash, 3351 mirror::ClassLoader* class_loader) { 3352 { 3353 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3354 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3355 if (result != nullptr) { 3356 return result; 3357 } 3358 } 3359 if (class_loader != nullptr || !dex_cache_image_class_lookup_required_) { 3360 return nullptr; 3361 } else { 3362 // Lookup failed but need to search dex_caches_. 3363 mirror::Class* result = LookupClassFromImage(descriptor); 3364 if (result != nullptr) { 3365 InsertClass(descriptor, result, hash); 3366 } else { 3367 // Searching the image dex files/caches failed, we don't want to get into this situation 3368 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3369 // classes into the class table. 3370 constexpr uint32_t kMaxFailedDexCacheLookups = 1000; 3371 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3372 MoveImageClassesToClassTable(); 3373 } 3374 } 3375 return result; 3376 } 3377} 3378 3379mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3380 mirror::ClassLoader* class_loader, 3381 size_t hash) { 3382 auto descriptor_pair = std::make_pair(descriptor, class_loader); 3383 auto it = pre_zygote_class_table_.FindWithHash(descriptor_pair, hash); 3384 if (it == pre_zygote_class_table_.end()) { 3385 it = class_table_.FindWithHash(descriptor_pair, hash); 3386 if (it == class_table_.end()) { 3387 return nullptr; 3388 } 3389 } 3390 return it->Read(); 3391} 3392 3393static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3394 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3395 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3396 CHECK(image != nullptr); 3397 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3398 return root->AsObjectArray<mirror::DexCache>(); 3399} 3400 3401void ClassLinker::MoveImageClassesToClassTable() { 3402 Thread* self = Thread::Current(); 3403 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3404 if (!dex_cache_image_class_lookup_required_) { 3405 return; // All dex cache classes are already in the class table. 3406 } 3407 const char* old_no_suspend_cause = 3408 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 3409 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3410 std::string temp; 3411 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3412 mirror::DexCache* dex_cache = dex_caches->Get(i); 3413 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3414 for (int32_t j = 0; j < types->GetLength(); j++) { 3415 mirror::Class* klass = types->Get(j); 3416 if (klass != nullptr) { 3417 DCHECK(klass->GetClassLoader() == nullptr); 3418 const char* descriptor = klass->GetDescriptor(&temp); 3419 size_t hash = ComputeModifiedUtf8Hash(descriptor); 3420 mirror::Class* existing = LookupClassFromTableLocked(descriptor, nullptr, hash); 3421 if (existing != nullptr) { 3422 CHECK_EQ(existing, klass) << PrettyClassAndClassLoader(existing) << " != " 3423 << PrettyClassAndClassLoader(klass); 3424 } else { 3425 class_table_.Insert(GcRoot<mirror::Class>(klass)); 3426 if (log_new_class_table_roots_) { 3427 new_class_roots_.push_back(GcRoot<mirror::Class>(klass)); 3428 } 3429 } 3430 } 3431 } 3432 } 3433 dex_cache_image_class_lookup_required_ = false; 3434 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3435} 3436 3437void ClassLinker::MoveClassTableToPreZygote() { 3438 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3439 DCHECK(pre_zygote_class_table_.Empty()); 3440 pre_zygote_class_table_ = std::move(class_table_); 3441 class_table_.Clear(); 3442} 3443 3444mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3445 Thread* self = Thread::Current(); 3446 const char* old_no_suspend_cause = 3447 self->StartAssertNoThreadSuspension("Image class lookup"); 3448 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3449 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3450 mirror::DexCache* dex_cache = dex_caches->Get(i); 3451 const DexFile* dex_file = dex_cache->GetDexFile(); 3452 // Try binary searching the string/type index. 3453 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3454 if (string_id != nullptr) { 3455 const DexFile::TypeId* type_id = 3456 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3457 if (type_id != nullptr) { 3458 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3459 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3460 if (klass != nullptr) { 3461 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3462 return klass; 3463 } 3464 } 3465 } 3466 } 3467 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3468 return nullptr; 3469} 3470 3471void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3472 result.clear(); 3473 if (dex_cache_image_class_lookup_required_) { 3474 MoveImageClassesToClassTable(); 3475 } 3476 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3477 while (true) { 3478 auto it = class_table_.Find(descriptor); 3479 if (it == class_table_.end()) { 3480 break; 3481 } 3482 result.push_back(it->Read()); 3483 class_table_.Erase(it); 3484 } 3485 for (mirror::Class* k : result) { 3486 class_table_.Insert(GcRoot<mirror::Class>(k)); 3487 } 3488 size_t pre_zygote_start = result.size(); 3489 // Now handle the pre zygote table. 3490 // Note: This dirties the pre-zygote table but shouldn't be an issue since LookupClasses is only 3491 // called from the debugger. 3492 while (true) { 3493 auto it = pre_zygote_class_table_.Find(descriptor); 3494 if (it == pre_zygote_class_table_.end()) { 3495 break; 3496 } 3497 result.push_back(it->Read()); 3498 pre_zygote_class_table_.Erase(it); 3499 } 3500 for (size_t i = pre_zygote_start; i < result.size(); ++i) { 3501 pre_zygote_class_table_.Insert(GcRoot<mirror::Class>(result[i])); 3502 } 3503} 3504 3505void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 3506 // TODO: assert that the monitor on the Class is held 3507 Thread* self = Thread::Current(); 3508 ObjectLock<mirror::Class> lock(self, klass); 3509 3510 // Don't attempt to re-verify if already sufficiently verified. 3511 if (klass->IsVerified()) { 3512 EnsurePreverifiedMethods(klass); 3513 return; 3514 } 3515 if (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler()) { 3516 return; 3517 } 3518 3519 // The class might already be erroneous, for example at compile time if we attempted to verify 3520 // this class as a parent to another. 3521 if (klass->IsErroneous()) { 3522 ThrowEarlierClassFailure(klass.Get()); 3523 return; 3524 } 3525 3526 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3527 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3528 } else { 3529 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3530 << PrettyClass(klass.Get()); 3531 CHECK(!Runtime::Current()->IsCompiler()); 3532 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3533 } 3534 3535 // Skip verification if disabled. 3536 if (!Runtime::Current()->IsVerificationEnabled()) { 3537 klass->SetStatus(mirror::Class::kStatusVerified, self); 3538 EnsurePreverifiedMethods(klass); 3539 return; 3540 } 3541 3542 // Verify super class. 3543 StackHandleScope<2> hs(self); 3544 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3545 if (super.Get() != nullptr) { 3546 // Acquire lock to prevent races on verifying the super class. 3547 ObjectLock<mirror::Class> lock(self, super); 3548 3549 if (!super->IsVerified() && !super->IsErroneous()) { 3550 VerifyClass(super); 3551 } 3552 if (!super->IsCompileTimeVerified()) { 3553 std::string error_msg( 3554 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3555 PrettyDescriptor(klass.Get()).c_str(), 3556 PrettyDescriptor(super.Get()).c_str())); 3557 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3558 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3559 if (cause.Get() != nullptr) { 3560 self->ClearException(); 3561 } 3562 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3563 if (cause.Get() != nullptr) { 3564 self->GetException(nullptr)->SetCause(cause.Get()); 3565 } 3566 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3567 if (Runtime::Current()->IsCompiler()) { 3568 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3569 } 3570 klass->SetStatus(mirror::Class::kStatusError, self); 3571 return; 3572 } 3573 } 3574 3575 // Try to use verification information from the oat file, otherwise do runtime verification. 3576 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3577 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3578 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3579 if (oat_file_class_status == mirror::Class::kStatusError) { 3580 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3581 << PrettyDescriptor(klass.Get()) << " in " 3582 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3583 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3584 PrettyDescriptor(klass.Get()).c_str()); 3585 klass->SetStatus(mirror::Class::kStatusError, self); 3586 return; 3587 } 3588 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3589 std::string error_msg; 3590 if (!preverified) { 3591 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 3592 Runtime::Current()->IsCompiler(), 3593 &error_msg); 3594 } 3595 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3596 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3597 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3598 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3599 << " because: " << error_msg; 3600 } 3601 self->AssertNoPendingException(); 3602 // Make sure all classes referenced by catch blocks are resolved. 3603 ResolveClassExceptionHandlerTypes(dex_file, klass); 3604 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3605 // Even though there were no verifier failures we need to respect whether the super-class 3606 // was verified or requiring runtime reverification. 3607 if (super.Get() == nullptr || super->IsVerified()) { 3608 klass->SetStatus(mirror::Class::kStatusVerified, self); 3609 } else { 3610 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3611 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3612 // Pretend a soft failure occured so that we don't consider the class verified below. 3613 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3614 } 3615 } else { 3616 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3617 // Soft failures at compile time should be retried at runtime. Soft 3618 // failures at runtime will be handled by slow paths in the generated 3619 // code. Set status accordingly. 3620 if (Runtime::Current()->IsCompiler()) { 3621 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3622 } else { 3623 klass->SetStatus(mirror::Class::kStatusVerified, self); 3624 // As this is a fake verified status, make sure the methods are _not_ marked preverified 3625 // later. 3626 klass->SetAccessFlags(klass->GetAccessFlags() | kAccPreverified); 3627 } 3628 } 3629 } else { 3630 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3631 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3632 << " because: " << error_msg; 3633 self->AssertNoPendingException(); 3634 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3635 klass->SetStatus(mirror::Class::kStatusError, self); 3636 } 3637 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3638 // Class is verified so we don't need to do any access check on its methods. 3639 // Let the interpreter know it by setting the kAccPreverified flag onto each 3640 // method. 3641 // Note: we're going here during compilation and at runtime. When we set the 3642 // kAccPreverified flag when compiling image classes, the flag is recorded 3643 // in the image and is set when loading the image. 3644 EnsurePreverifiedMethods(klass); 3645 } 3646} 3647 3648void ClassLinker::EnsurePreverifiedMethods(Handle<mirror::Class> klass) { 3649 if ((klass->GetAccessFlags() & kAccPreverified) == 0) { 3650 klass->SetPreverifiedFlagOnAllMethods(); 3651 klass->SetAccessFlags(klass->GetAccessFlags() | kAccPreverified); 3652 } 3653} 3654 3655bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3656 mirror::Class::Status& oat_file_class_status) { 3657 // If we're compiling, we can only verify the class using the oat file if 3658 // we are not compiling the image or if the class we're verifying is not part of 3659 // the app. In other words, we will only check for preverification of bootclasspath 3660 // classes. 3661 if (Runtime::Current()->IsCompiler()) { 3662 // Are we compiling the bootclasspath? 3663 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3664 return false; 3665 } 3666 // We are compiling an app (not the image). 3667 3668 // Is this an app class? (I.e. not a bootclasspath class) 3669 if (klass->GetClassLoader() != nullptr) { 3670 return false; 3671 } 3672 } 3673 3674 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 3675 // In case we run without an image there won't be a backing oat file. 3676 if (oat_dex_file == nullptr) { 3677 return false; 3678 } 3679 3680 // We may be running with a preopted oat file but without image. In this case, 3681 // we don't skip verification of preverified classes to ensure we initialize 3682 // dex caches with all types resolved during verification. 3683 if (!Runtime::Current()->IsCompiler() && 3684 !Runtime::Current()->GetHeap()->HasImageSpace()) { 3685 return false; 3686 } 3687 3688 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3689 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3690 if (oat_file_class_status == mirror::Class::kStatusVerified || 3691 oat_file_class_status == mirror::Class::kStatusInitialized) { 3692 return true; 3693 } 3694 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3695 // Compile time verification failed with a soft error. Compile time verification can fail 3696 // because we have incomplete type information. Consider the following: 3697 // class ... { 3698 // Foo x; 3699 // .... () { 3700 // if (...) { 3701 // v1 gets assigned a type of resolved class Foo 3702 // } else { 3703 // v1 gets assigned a type of unresolved class Bar 3704 // } 3705 // iput x = v1 3706 // } } 3707 // when we merge v1 following the if-the-else it results in Conflict 3708 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3709 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3710 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3711 // at compile time). 3712 return false; 3713 } 3714 if (oat_file_class_status == mirror::Class::kStatusError) { 3715 // Compile time verification failed with a hard error. This is caused by invalid instructions 3716 // in the class. These errors are unrecoverable. 3717 return false; 3718 } 3719 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3720 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3721 // not loading the class. 3722 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3723 // isn't a problem and this case shouldn't occur 3724 return false; 3725 } 3726 std::string temp; 3727 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3728 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3729 << klass->GetDescriptor(&temp); 3730 3731 return false; 3732} 3733 3734void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3735 Handle<mirror::Class> klass) { 3736 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3737 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3738 } 3739 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3740 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3741 } 3742} 3743 3744void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3745 mirror::ArtMethod* method) { 3746 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3747 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3748 if (code_item == nullptr) { 3749 return; // native or abstract method 3750 } 3751 if (code_item->tries_size_ == 0) { 3752 return; // nothing to process 3753 } 3754 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3755 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3756 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3757 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3758 CatchHandlerIterator iterator(handlers_ptr); 3759 for (; iterator.HasNext(); iterator.Next()) { 3760 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3761 // unresolved exception types will be ignored by exception delivery 3762 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3763 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3764 if (exception_type == nullptr) { 3765 DCHECK(Thread::Current()->IsExceptionPending()); 3766 Thread::Current()->ClearException(); 3767 } 3768 } 3769 } 3770 handlers_ptr = iterator.EndDataPointer(); 3771 } 3772} 3773 3774static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3775static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3776 Handle<mirror::ArtMethod> prototype); 3777 3778mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3779 jobjectArray interfaces, jobject loader, 3780 jobjectArray methods, jobjectArray throws) { 3781 Thread* self = soa.Self(); 3782 StackHandleScope<8> hs(self); 3783 Handle<mirror::Class> klass(hs.NewHandle( 3784 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3785 if (klass.Get() == nullptr) { 3786 CHECK(self->IsExceptionPending()); // OOME. 3787 return nullptr; 3788 } 3789 DCHECK(klass->GetClass() != nullptr); 3790 klass->SetObjectSize(sizeof(mirror::Proxy)); 3791 // Set the class access flags incl. preverified, so we do not try to set the flag on the methods. 3792 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal | kAccPreverified); 3793 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3794 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3795 klass->SetName(soa.Decode<mirror::String*>(name)); 3796 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3797 klass->SetDexCache(proxy_class->GetDexCache()); 3798 klass->SetStatus(mirror::Class::kStatusIdx, self); 3799 3800 // Instance fields are inherited, but we add a couple of static fields... 3801 { 3802 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3803 if (UNLIKELY(sfields == nullptr)) { 3804 CHECK(self->IsExceptionPending()); // OOME. 3805 return nullptr; 3806 } 3807 klass->SetSFields(sfields); 3808 } 3809 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3810 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3811 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3812 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3813 CHECK(self->IsExceptionPending()); // OOME. 3814 return nullptr; 3815 } 3816 klass->SetStaticField(0, interfaces_sfield.Get()); 3817 interfaces_sfield->SetDexFieldIndex(0); 3818 interfaces_sfield->SetDeclaringClass(klass.Get()); 3819 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3820 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3821 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3822 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3823 CHECK(self->IsExceptionPending()); // OOME. 3824 return nullptr; 3825 } 3826 klass->SetStaticField(1, throws_sfield.Get()); 3827 throws_sfield->SetDexFieldIndex(1); 3828 throws_sfield->SetDeclaringClass(klass.Get()); 3829 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3830 3831 // Proxies have 1 direct method, the constructor 3832 { 3833 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3834 if (UNLIKELY(directs == nullptr)) { 3835 CHECK(self->IsExceptionPending()); // OOME. 3836 return nullptr; 3837 } 3838 klass->SetDirectMethods(directs); 3839 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3840 if (UNLIKELY(constructor == nullptr)) { 3841 CHECK(self->IsExceptionPending()); // OOME. 3842 return nullptr; 3843 } 3844 klass->SetDirectMethod(0, constructor); 3845 } 3846 3847 // Create virtual method using specified prototypes. 3848 size_t num_virtual_methods = 3849 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3850 { 3851 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3852 num_virtual_methods); 3853 if (UNLIKELY(virtuals == nullptr)) { 3854 CHECK(self->IsExceptionPending()); // OOME. 3855 return nullptr; 3856 } 3857 klass->SetVirtualMethods(virtuals); 3858 } 3859 for (size_t i = 0; i < num_virtual_methods; ++i) { 3860 StackHandleScope<1> hs(self); 3861 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3862 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3863 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3864 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3865 if (UNLIKELY(clone == nullptr)) { 3866 CHECK(self->IsExceptionPending()); // OOME. 3867 return nullptr; 3868 } 3869 klass->SetVirtualMethod(i, clone); 3870 } 3871 3872 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3873 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3874 self->AssertNoPendingException(); 3875 3876 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3877 mirror::Class* new_class = nullptr; 3878 { 3879 // Must hold lock on object when resolved. 3880 ObjectLock<mirror::Class> resolution_lock(self, klass); 3881 // Link the fields and virtual methods, creating vtable and iftables 3882 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3883 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3884 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3885 klass->SetStatus(mirror::Class::kStatusError, self); 3886 return nullptr; 3887 } 3888 } 3889 3890 CHECK(klass->IsRetired()); 3891 CHECK_NE(klass.Get(), new_class); 3892 klass.Assign(new_class); 3893 3894 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3895 interfaces_sfield->SetObject<false>(klass.Get(), 3896 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3897 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3898 throws_sfield->SetObject<false>(klass.Get(), 3899 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3900 3901 { 3902 // Lock on klass is released. Lock new class object. 3903 ObjectLock<mirror::Class> initialization_lock(self, klass); 3904 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3905 } 3906 3907 // sanity checks 3908 if (kIsDebugBuild) { 3909 CHECK(klass->GetIFields() == nullptr); 3910 CheckProxyConstructor(klass->GetDirectMethod(0)); 3911 for (size_t i = 0; i < num_virtual_methods; ++i) { 3912 StackHandleScope<2> hs(self); 3913 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3914 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3915 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3916 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3917 CheckProxyMethod(virtual_method, prototype); 3918 } 3919 3920 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3921 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3922 decoded_name->ToModifiedUtf8().c_str())); 3923 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3924 3925 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3926 decoded_name->ToModifiedUtf8().c_str())); 3927 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3928 3929 CHECK_EQ(klass.Get()->GetInterfaces(), 3930 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3931 CHECK_EQ(klass.Get()->GetThrows(), 3932 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3933 } 3934 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), 3935 ComputeModifiedUtf8Hash(descriptor.c_str())); 3936 CHECK(existing == nullptr); 3937 return klass.Get(); 3938} 3939 3940std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3941 DCHECK(proxy_class->IsProxyClass()); 3942 mirror::String* name = proxy_class->GetName(); 3943 DCHECK(name != nullptr); 3944 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3945} 3946 3947mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3948 mirror::ArtMethod* proxy_method) { 3949 DCHECK(proxy_class->IsProxyClass()); 3950 DCHECK(proxy_method->IsProxyMethod()); 3951 // Locate the dex cache of the original interface/Object 3952 mirror::DexCache* dex_cache = nullptr; 3953 { 3954 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3955 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3956 mirror::DexCache* a_dex_cache = GetDexCache(i); 3957 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3958 dex_cache = a_dex_cache; 3959 break; 3960 } 3961 } 3962 } 3963 CHECK(dex_cache != nullptr); 3964 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3965 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3966 CHECK(resolved_method != nullptr); 3967 return resolved_method; 3968} 3969 3970 3971mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3972 Handle<mirror::Class> klass, 3973 mirror::Class* proxy_class) { 3974 // Create constructor for Proxy that must initialize h 3975 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3976 proxy_class->GetDirectMethods(); 3977 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3978 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3979 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 3980 // constructor method. 3981 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 3982 proxy_constructor); 3983 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3984 // code_ too) 3985 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3986 if (constructor == nullptr) { 3987 CHECK(self->IsExceptionPending()); // OOME. 3988 return nullptr; 3989 } 3990 // Make this constructor public and fix the class to be our Proxy version 3991 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3992 constructor->SetDeclaringClass(klass.Get()); 3993 return constructor; 3994} 3995 3996static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3997 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3998 CHECK(constructor->IsConstructor()); 3999 CHECK_STREQ(constructor->GetName(), "<init>"); 4000 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 4001 "(Ljava/lang/reflect/InvocationHandler;)V"); 4002 DCHECK(constructor->IsPublic()); 4003} 4004 4005mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 4006 Handle<mirror::Class> klass, 4007 Handle<mirror::ArtMethod> prototype) { 4008 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 4009 // prototype method 4010 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 4011 prototype.Get()); 4012 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 4013 // as necessary 4014 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 4015 if (UNLIKELY(method == nullptr)) { 4016 CHECK(self->IsExceptionPending()); // OOME. 4017 return nullptr; 4018 } 4019 4020 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 4021 // the intersection of throw exceptions as defined in Proxy 4022 method->SetDeclaringClass(klass.Get()); 4023 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 4024 4025 // At runtime the method looks like a reference and argument saving method, clone the code 4026 // related parameters from this method. 4027 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 4028#if defined(ART_USE_PORTABLE_COMPILER) 4029 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 4030#endif 4031 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 4032 4033 return method; 4034} 4035 4036static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 4037 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4038 // Basic sanity 4039 CHECK(!prototype->IsFinal()); 4040 CHECK(method->IsFinal()); 4041 CHECK(!method->IsAbstract()); 4042 4043 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 4044 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 4045 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 4046 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 4047 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 4048 4049 MethodHelper mh(method); 4050 MethodHelper mh2(prototype); 4051 CHECK_STREQ(method->GetName(), prototype->GetName()); 4052 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 4053 // More complex sanity - via dex cache 4054 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 4055} 4056 4057static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 4058 bool can_init_parents) 4059 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4060 if (can_init_statics && can_init_parents) { 4061 return true; 4062 } 4063 if (!can_init_statics) { 4064 // Check if there's a class initializer. 4065 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4066 if (clinit != nullptr) { 4067 return false; 4068 } 4069 // Check if there are encoded static values needing initialization. 4070 if (klass->NumStaticFields() != 0) { 4071 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4072 DCHECK(dex_class_def != nullptr); 4073 if (dex_class_def->static_values_off_ != 0) { 4074 return false; 4075 } 4076 } 4077 } 4078 if (!klass->IsInterface() && klass->HasSuperClass()) { 4079 mirror::Class* super_class = klass->GetSuperClass(); 4080 if (!can_init_parents && !super_class->IsInitialized()) { 4081 return false; 4082 } else { 4083 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 4084 return false; 4085 } 4086 } 4087 } 4088 return true; 4089} 4090 4091bool ClassLinker::IsInitialized() const { 4092 return init_done_; 4093} 4094 4095bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 4096 bool can_init_parents) { 4097 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 4098 4099 // Are we already initialized and therefore done? 4100 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 4101 // an initialized class will never change its state. 4102 if (klass->IsInitialized()) { 4103 return true; 4104 } 4105 4106 // Fast fail if initialization requires a full runtime. Not part of the JLS. 4107 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 4108 return false; 4109 } 4110 4111 Thread* self = Thread::Current(); 4112 uint64_t t0; 4113 { 4114 ObjectLock<mirror::Class> lock(self, klass); 4115 4116 // Re-check under the lock in case another thread initialized ahead of us. 4117 if (klass->IsInitialized()) { 4118 return true; 4119 } 4120 4121 // Was the class already found to be erroneous? Done under the lock to match the JLS. 4122 if (klass->IsErroneous()) { 4123 ThrowEarlierClassFailure(klass.Get()); 4124 return false; 4125 } 4126 4127 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 4128 4129 if (!klass->IsVerified()) { 4130 VerifyClass(klass); 4131 if (!klass->IsVerified()) { 4132 // We failed to verify, expect either the klass to be erroneous or verification failed at 4133 // compile time. 4134 if (klass->IsErroneous()) { 4135 CHECK(self->IsExceptionPending()); 4136 } else { 4137 CHECK(Runtime::Current()->IsCompiler()); 4138 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 4139 } 4140 return false; 4141 } else { 4142 self->AssertNoPendingException(); 4143 } 4144 } 4145 4146 // If the class is kStatusInitializing, either this thread is 4147 // initializing higher up the stack or another thread has beat us 4148 // to initializing and we need to wait. Either way, this 4149 // invocation of InitializeClass will not be responsible for 4150 // running <clinit> and will return. 4151 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4152 // Could have got an exception during verification. 4153 if (self->IsExceptionPending()) { 4154 return false; 4155 } 4156 // We caught somebody else in the act; was it us? 4157 if (klass->GetClinitThreadId() == self->GetTid()) { 4158 // Yes. That's fine. Return so we can continue initializing. 4159 return true; 4160 } 4161 // No. That's fine. Wait for another thread to finish initializing. 4162 return WaitForInitializeClass(klass, self, lock); 4163 } 4164 4165 if (!ValidateSuperClassDescriptors(klass)) { 4166 klass->SetStatus(mirror::Class::kStatusError, self); 4167 return false; 4168 } 4169 4170 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 4171 4172 // From here out other threads may observe that we're initializing and so changes of state 4173 // require the a notification. 4174 klass->SetClinitThreadId(self->GetTid()); 4175 klass->SetStatus(mirror::Class::kStatusInitializing, self); 4176 4177 t0 = NanoTime(); 4178 } 4179 4180 // Initialize super classes, must be done while initializing for the JLS. 4181 if (!klass->IsInterface() && klass->HasSuperClass()) { 4182 mirror::Class* super_class = klass->GetSuperClass(); 4183 if (!super_class->IsInitialized()) { 4184 CHECK(!super_class->IsInterface()); 4185 CHECK(can_init_parents); 4186 StackHandleScope<1> hs(self); 4187 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 4188 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 4189 if (!super_initialized) { 4190 // The super class was verified ahead of entering initializing, we should only be here if 4191 // the super class became erroneous due to initialization. 4192 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 4193 << "Super class initialization failed for " 4194 << PrettyDescriptor(handle_scope_super.Get()) 4195 << " that has unexpected status " << handle_scope_super->GetStatus() 4196 << "\nPending exception:\n" 4197 << (self->GetException(nullptr) != nullptr ? self->GetException(nullptr)->Dump() : ""); 4198 ObjectLock<mirror::Class> lock(self, klass); 4199 // Initialization failed because the super-class is erroneous. 4200 klass->SetStatus(mirror::Class::kStatusError, self); 4201 return false; 4202 } 4203 } 4204 } 4205 4206 const size_t num_static_fields = klass->NumStaticFields(); 4207 if (num_static_fields > 0) { 4208 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4209 CHECK(dex_class_def != nullptr); 4210 const DexFile& dex_file = klass->GetDexFile(); 4211 StackHandleScope<2> hs(self); 4212 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 4213 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 4214 4215 // Eagerly fill in static fields so that the we don't have to do as many expensive 4216 // Class::FindStaticField in ResolveField. 4217 for (size_t i = 0; i < num_static_fields; ++i) { 4218 mirror::ArtField* field = klass->GetStaticField(i); 4219 const uint32_t field_idx = field->GetDexFieldIndex(); 4220 mirror::ArtField* resolved_field = dex_cache->GetResolvedField(field_idx); 4221 if (resolved_field == nullptr) { 4222 dex_cache->SetResolvedField(field_idx, field); 4223 } else { 4224 DCHECK_EQ(field, resolved_field); 4225 } 4226 } 4227 4228 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 4229 this, *dex_class_def); 4230 if (it.HasNext()) { 4231 CHECK(can_init_statics); 4232 // We reordered the fields, so we need to be able to map the 4233 // field indexes to the right fields. 4234 SafeMap<uint32_t, mirror::ArtField*> field_map; 4235 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 4236 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 4237 if (Runtime::Current()->IsActiveTransaction()) { 4238 it.ReadValueToField<true>(field_map.Get(i)); 4239 } else { 4240 it.ReadValueToField<false>(field_map.Get(i)); 4241 } 4242 } 4243 } 4244 } 4245 4246 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4247 if (clinit != nullptr) { 4248 CHECK(can_init_statics); 4249 JValue result; 4250 clinit->Invoke(self, nullptr, 0, &result, "V"); 4251 } 4252 4253 uint64_t t1 = NanoTime(); 4254 4255 bool success = true; 4256 { 4257 ObjectLock<mirror::Class> lock(self, klass); 4258 4259 if (self->IsExceptionPending()) { 4260 WrapExceptionInInitializer(); 4261 klass->SetStatus(mirror::Class::kStatusError, self); 4262 success = false; 4263 } else { 4264 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 4265 RuntimeStats* thread_stats = self->GetStats(); 4266 ++global_stats->class_init_count; 4267 ++thread_stats->class_init_count; 4268 global_stats->class_init_time_ns += (t1 - t0); 4269 thread_stats->class_init_time_ns += (t1 - t0); 4270 // Set the class as initialized except if failed to initialize static fields. 4271 klass->SetStatus(mirror::Class::kStatusInitialized, self); 4272 if (VLOG_IS_ON(class_linker)) { 4273 std::string temp; 4274 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 4275 klass->GetLocation(); 4276 } 4277 // Opportunistically set static method trampolines to their destination. 4278 FixupStaticTrampolines(klass.Get()); 4279 } 4280 } 4281 return success; 4282} 4283 4284bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 4285 ObjectLock<mirror::Class>& lock) 4286 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4287 while (true) { 4288 self->AssertNoPendingException(); 4289 CHECK(!klass->IsInitialized()); 4290 lock.WaitIgnoringInterrupts(); 4291 4292 // When we wake up, repeat the test for init-in-progress. If 4293 // there's an exception pending (only possible if 4294 // "interruptShouldThrow" was set), bail out. 4295 if (self->IsExceptionPending()) { 4296 WrapExceptionInInitializer(); 4297 klass->SetStatus(mirror::Class::kStatusError, self); 4298 return false; 4299 } 4300 // Spurious wakeup? Go back to waiting. 4301 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4302 continue; 4303 } 4304 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 4305 // Compile time initialization failed. 4306 return false; 4307 } 4308 if (klass->IsErroneous()) { 4309 // The caller wants an exception, but it was thrown in a 4310 // different thread. Synthesize one here. 4311 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 4312 PrettyDescriptor(klass.Get()).c_str()); 4313 return false; 4314 } 4315 if (klass->IsInitialized()) { 4316 return true; 4317 } 4318 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4319 << klass->GetStatus(); 4320 } 4321 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 4322} 4323 4324bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 4325 if (klass->IsInterface()) { 4326 return true; 4327 } 4328 // Begin with the methods local to the superclass. 4329 StackHandleScope<2> hs(Thread::Current()); 4330 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4331 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4332 if (klass->HasSuperClass() && 4333 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4334 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4335 mh.ChangeMethod(klass->GetVTableEntry(i)); 4336 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 4337 if (mh.GetMethod() != super_mh.GetMethod() && 4338 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4339 ThrowLinkageError(klass.Get(), 4340 "Class %s method %s resolves differently in superclass %s", 4341 PrettyDescriptor(klass.Get()).c_str(), 4342 PrettyMethod(mh.GetMethod()).c_str(), 4343 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4344 return false; 4345 } 4346 } 4347 } 4348 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4349 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4350 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4351 for (uint32_t j = 0; j < num_methods; ++j) { 4352 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4353 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4354 if (mh.GetMethod() != super_mh.GetMethod() && 4355 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4356 ThrowLinkageError(klass.Get(), 4357 "Class %s method %s resolves differently in interface %s", 4358 PrettyDescriptor(klass.Get()).c_str(), 4359 PrettyMethod(mh.GetMethod()).c_str(), 4360 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4361 return false; 4362 } 4363 } 4364 } 4365 } 4366 return true; 4367} 4368 4369bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 4370 bool can_init_parents) { 4371 DCHECK(c.Get() != nullptr); 4372 if (c->IsInitialized()) { 4373 EnsurePreverifiedMethods(c); 4374 return true; 4375 } 4376 const bool success = InitializeClass(c, can_init_fields, can_init_parents); 4377 Thread* self = Thread::Current(); 4378 if (!success) { 4379 if (can_init_fields && can_init_parents) { 4380 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4381 } 4382 } else { 4383 self->AssertNoPendingException(); 4384 } 4385 return success; 4386} 4387 4388void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 4389 mirror::Class* c, 4390 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 4391 const byte* class_data = dex_file.GetClassData(dex_class_def); 4392 ClassDataItemIterator it(dex_file, class_data); 4393 StackHandleScope<2> hs(Thread::Current()); 4394 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 4395 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 4396 CHECK(!kMovingFields); 4397 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 4398 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 4399 } 4400} 4401 4402void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4403 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4404 if (fields != nullptr) { 4405 for (int index = 0; index < fields->GetLength(); index ++) { 4406 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4407 fields->Get(index)->SetDeclaringClass(new_class); 4408 } 4409 } 4410 } 4411 4412 fields = new_class->GetSFields(); 4413 if (fields != nullptr) { 4414 for (int index = 0; index < fields->GetLength(); index ++) { 4415 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4416 fields->Get(index)->SetDeclaringClass(new_class); 4417 } 4418 } 4419 } 4420 4421 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4422 if (methods != nullptr) { 4423 for (int index = 0; index < methods->GetLength(); index ++) { 4424 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4425 methods->Get(index)->SetDeclaringClass(new_class); 4426 } 4427 } 4428 } 4429 4430 methods = new_class->GetVirtualMethods(); 4431 if (methods != nullptr) { 4432 for (int index = 0; index < methods->GetLength(); index ++) { 4433 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4434 methods->Get(index)->SetDeclaringClass(new_class); 4435 } 4436 } 4437 } 4438} 4439 4440bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4441 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4442 mirror::Class** new_class) { 4443 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4444 4445 if (!LinkSuperClass(klass)) { 4446 return false; 4447 } 4448 StackHandleScope<mirror::Class::kImtSize> imt_handle_scope( 4449 self, Runtime::Current()->GetImtUnimplementedMethod()); 4450 if (!LinkMethods(self, klass, interfaces, &imt_handle_scope)) { 4451 return false; 4452 } 4453 if (!LinkInstanceFields(klass)) { 4454 return false; 4455 } 4456 size_t class_size; 4457 if (!LinkStaticFields(klass, &class_size)) { 4458 return false; 4459 } 4460 CreateReferenceInstanceOffsets(klass); 4461 CreateReferenceStaticOffsets(klass); 4462 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4463 4464 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4465 // We don't need to retire this class as it has no embedded tables or it was created the 4466 // correct size during class linker initialization. 4467 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4468 4469 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4470 klass->PopulateEmbeddedImtAndVTable(&imt_handle_scope); 4471 } 4472 4473 // This will notify waiters on klass that saw the not yet resolved 4474 // class in the class_table_ during EnsureResolved. 4475 klass->SetStatus(mirror::Class::kStatusResolved, self); 4476 *new_class = klass.Get(); 4477 } else { 4478 CHECK(!klass->IsResolved()); 4479 // Retire the temporary class and create the correctly sized resolved class. 4480 *new_class = klass->CopyOf(self, class_size, &imt_handle_scope); 4481 if (UNLIKELY(*new_class == nullptr)) { 4482 CHECK(self->IsExceptionPending()); // Expect an OOME. 4483 klass->SetStatus(mirror::Class::kStatusError, self); 4484 return false; 4485 } 4486 4487 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4488 StackHandleScope<1> hs(self); 4489 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4490 ObjectLock<mirror::Class> lock(self, new_class_h); 4491 4492 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4493 4494 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), 4495 ComputeModifiedUtf8Hash(descriptor)); 4496 CHECK(existing == nullptr || existing == klass.Get()); 4497 4498 // This will notify waiters on temp class that saw the not yet resolved class in the 4499 // class_table_ during EnsureResolved. 4500 klass->SetStatus(mirror::Class::kStatusRetired, self); 4501 4502 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4503 // This will notify waiters on new_class that saw the not yet resolved 4504 // class in the class_table_ during EnsureResolved. 4505 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4506 } 4507 return true; 4508} 4509 4510static void CountMethodsAndFields(ClassDataItemIterator& dex_data, 4511 size_t* virtual_methods, 4512 size_t* direct_methods, 4513 size_t* static_fields, 4514 size_t* instance_fields) { 4515 *virtual_methods = *direct_methods = *static_fields = *instance_fields = 0; 4516 4517 while (dex_data.HasNextStaticField()) { 4518 dex_data.Next(); 4519 (*static_fields)++; 4520 } 4521 while (dex_data.HasNextInstanceField()) { 4522 dex_data.Next(); 4523 (*instance_fields)++; 4524 } 4525 while (dex_data.HasNextDirectMethod()) { 4526 (*direct_methods)++; 4527 dex_data.Next(); 4528 } 4529 while (dex_data.HasNextVirtualMethod()) { 4530 (*virtual_methods)++; 4531 dex_data.Next(); 4532 } 4533 DCHECK(!dex_data.HasNext()); 4534} 4535 4536static void DumpClass(std::ostream& os, 4537 const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 4538 const char* suffix) { 4539 ClassDataItemIterator dex_data(dex_file, dex_file.GetClassData(dex_class_def)); 4540 os << dex_file.GetClassDescriptor(dex_class_def) << suffix << ":\n"; 4541 os << " Static fields:\n"; 4542 while (dex_data.HasNextStaticField()) { 4543 const DexFile::FieldId& id = dex_file.GetFieldId(dex_data.GetMemberIndex()); 4544 os << " " << dex_file.GetFieldTypeDescriptor(id) << " " << dex_file.GetFieldName(id) << "\n"; 4545 dex_data.Next(); 4546 } 4547 os << " Instance fields:\n"; 4548 while (dex_data.HasNextInstanceField()) { 4549 const DexFile::FieldId& id = dex_file.GetFieldId(dex_data.GetMemberIndex()); 4550 os << " " << dex_file.GetFieldTypeDescriptor(id) << " " << dex_file.GetFieldName(id) << "\n"; 4551 dex_data.Next(); 4552 } 4553 os << " Direct methods:\n"; 4554 while (dex_data.HasNextDirectMethod()) { 4555 const DexFile::MethodId& id = dex_file.GetMethodId(dex_data.GetMemberIndex()); 4556 os << " " << dex_file.GetMethodName(id) << dex_file.GetMethodSignature(id).ToString() << "\n"; 4557 dex_data.Next(); 4558 } 4559 os << " Virtual methods:\n"; 4560 while (dex_data.HasNextVirtualMethod()) { 4561 const DexFile::MethodId& id = dex_file.GetMethodId(dex_data.GetMemberIndex()); 4562 os << " " << dex_file.GetMethodName(id) << dex_file.GetMethodSignature(id).ToString() << "\n"; 4563 dex_data.Next(); 4564 } 4565} 4566 4567static std::string DumpClasses(const DexFile& dex_file1, const DexFile::ClassDef& dex_class_def1, 4568 const DexFile& dex_file2, const DexFile::ClassDef& dex_class_def2) { 4569 std::ostringstream os; 4570 DumpClass(os, dex_file1, dex_class_def1, " (Compile time)"); 4571 DumpClass(os, dex_file2, dex_class_def2, " (Runtime)"); 4572 return os.str(); 4573} 4574 4575 4576// Very simple structural check on whether the classes match. Only compares the number of 4577// methods and fields. 4578static bool SimpleStructuralCheck(const DexFile& dex_file1, const DexFile::ClassDef& dex_class_def1, 4579 const DexFile& dex_file2, const DexFile::ClassDef& dex_class_def2, 4580 std::string* error_msg) { 4581 ClassDataItemIterator dex_data1(dex_file1, dex_file1.GetClassData(dex_class_def1)); 4582 ClassDataItemIterator dex_data2(dex_file2, dex_file2.GetClassData(dex_class_def2)); 4583 4584 // Counters for current dex file. 4585 size_t dex_virtual_methods1, dex_direct_methods1, dex_static_fields1, dex_instance_fields1; 4586 CountMethodsAndFields(dex_data1, &dex_virtual_methods1, &dex_direct_methods1, &dex_static_fields1, 4587 &dex_instance_fields1); 4588 // Counters for compile-time dex file. 4589 size_t dex_virtual_methods2, dex_direct_methods2, dex_static_fields2, dex_instance_fields2; 4590 CountMethodsAndFields(dex_data2, &dex_virtual_methods2, &dex_direct_methods2, &dex_static_fields2, 4591 &dex_instance_fields2); 4592 4593 if (dex_virtual_methods1 != dex_virtual_methods2) { 4594 std::string class_dump = DumpClasses(dex_file1, dex_class_def1, dex_file2, dex_class_def2); 4595 *error_msg = StringPrintf("Virtual method count off: %zu vs %zu\n%s", dex_virtual_methods1, 4596 dex_virtual_methods2, class_dump.c_str()); 4597 return false; 4598 } 4599 if (dex_direct_methods1 != dex_direct_methods2) { 4600 std::string class_dump = DumpClasses(dex_file1, dex_class_def1, dex_file2, dex_class_def2); 4601 *error_msg = StringPrintf("Direct method count off: %zu vs %zu\n%s", dex_direct_methods1, 4602 dex_direct_methods2, class_dump.c_str()); 4603 return false; 4604 } 4605 if (dex_static_fields1 != dex_static_fields2) { 4606 std::string class_dump = DumpClasses(dex_file1, dex_class_def1, dex_file2, dex_class_def2); 4607 *error_msg = StringPrintf("Static field count off: %zu vs %zu\n%s", dex_static_fields1, 4608 dex_static_fields2, class_dump.c_str()); 4609 return false; 4610 } 4611 if (dex_instance_fields1 != dex_instance_fields2) { 4612 std::string class_dump = DumpClasses(dex_file1, dex_class_def1, dex_file2, dex_class_def2); 4613 *error_msg = StringPrintf("Instance field count off: %zu vs %zu\n%s", dex_instance_fields1, 4614 dex_instance_fields2, class_dump.c_str()); 4615 return false; 4616 } 4617 4618 return true; 4619} 4620 4621// Checks whether a the super-class changed from what we had at compile-time. This would 4622// invalidate quickening. 4623static bool CheckSuperClassChange(Handle<mirror::Class> klass, 4624 const DexFile& dex_file, 4625 const DexFile::ClassDef& class_def, 4626 mirror::Class* super_class) 4627 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4628 // Check for unexpected changes in the superclass. 4629 // Quick check 1) is the super_class class-loader the boot class loader? This always has 4630 // precedence. 4631 if (super_class->GetClassLoader() != nullptr && 4632 // Quick check 2) different dex cache? Breaks can only occur for different dex files, 4633 // which is implied by different dex cache. 4634 klass->GetDexCache() != super_class->GetDexCache()) { 4635 // Now comes the expensive part: things can be broken if (a) the klass' dex file has a 4636 // definition for the super-class, and (b) the files are in separate oat files. The oat files 4637 // are referenced from the dex file, so do (b) first. Only relevant if we have oat files. 4638 const OatFile* class_oat_file = dex_file.GetOatFile(); 4639 if (class_oat_file != nullptr) { 4640 const OatFile* loaded_super_oat_file = super_class->GetDexFile().GetOatFile(); 4641 if (loaded_super_oat_file != nullptr && class_oat_file != loaded_super_oat_file) { 4642 // Now check (a). 4643 const DexFile::ClassDef* super_class_def = dex_file.FindClassDef(class_def.superclass_idx_); 4644 if (super_class_def != nullptr) { 4645 // Uh-oh, we found something. Do our check. 4646 std::string error_msg; 4647 if (!SimpleStructuralCheck(dex_file, *super_class_def, 4648 super_class->GetDexFile(), *super_class->GetClassDef(), 4649 &error_msg)) { 4650 // Print a warning to the log. This exception might be caught, e.g., as common in test 4651 // drivers. When the class is later tried to be used, we re-throw a new instance, as we 4652 // only save the type of the exception. 4653 LOG(WARNING) << "Incompatible structural change detected: " << 4654 StringPrintf( 4655 "Structural change of %s is hazardous (%s at compile time, %s at runtime): %s", 4656 PrettyType(super_class_def->class_idx_, dex_file).c_str(), 4657 class_oat_file->GetLocation().c_str(), 4658 loaded_super_oat_file->GetLocation().c_str(), 4659 error_msg.c_str()); 4660 ThrowIncompatibleClassChangeError(klass.Get(), 4661 "Structural change of %s is hazardous (%s at compile time, %s at runtime): %s", 4662 PrettyType(super_class_def->class_idx_, dex_file).c_str(), 4663 class_oat_file->GetLocation().c_str(), 4664 loaded_super_oat_file->GetLocation().c_str(), 4665 error_msg.c_str()); 4666 return false; 4667 } 4668 } 4669 } 4670 } 4671 } 4672 return true; 4673} 4674 4675bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4676 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4677 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4678 uint16_t super_class_idx = class_def.superclass_idx_; 4679 if (super_class_idx != DexFile::kDexNoIndex16) { 4680 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4681 if (super_class == nullptr) { 4682 DCHECK(Thread::Current()->IsExceptionPending()); 4683 return false; 4684 } 4685 // Verify 4686 if (!klass->CanAccess(super_class)) { 4687 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4688 PrettyDescriptor(super_class).c_str(), 4689 PrettyDescriptor(klass.Get()).c_str()); 4690 return false; 4691 } 4692 CHECK(super_class->IsResolved()); 4693 klass->SetSuperClass(super_class); 4694 4695 if (!CheckSuperClassChange(klass, dex_file, class_def, super_class)) { 4696 DCHECK(Thread::Current()->IsExceptionPending()); 4697 return false; 4698 } 4699 } 4700 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4701 if (interfaces != nullptr) { 4702 for (size_t i = 0; i < interfaces->Size(); i++) { 4703 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4704 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4705 if (interface == nullptr) { 4706 DCHECK(Thread::Current()->IsExceptionPending()); 4707 return false; 4708 } 4709 // Verify 4710 if (!klass->CanAccess(interface)) { 4711 // TODO: the RI seemed to ignore this in my testing. 4712 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4713 PrettyDescriptor(interface).c_str(), 4714 PrettyDescriptor(klass.Get()).c_str()); 4715 return false; 4716 } 4717 } 4718 } 4719 // Mark the class as loaded. 4720 klass->SetStatus(mirror::Class::kStatusLoaded, nullptr); 4721 return true; 4722} 4723 4724bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4725 CHECK(!klass->IsPrimitive()); 4726 mirror::Class* super = klass->GetSuperClass(); 4727 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4728 if (super != nullptr) { 4729 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4730 return false; 4731 } 4732 return true; 4733 } 4734 if (super == nullptr) { 4735 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4736 PrettyDescriptor(klass.Get()).c_str()); 4737 return false; 4738 } 4739 // Verify 4740 if (super->IsFinal() || super->IsInterface()) { 4741 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4742 PrettyDescriptor(super).c_str(), 4743 PrettyDescriptor(klass.Get()).c_str(), 4744 super->IsFinal() ? "declared final" : "an interface"); 4745 return false; 4746 } 4747 if (!klass->CanAccess(super)) { 4748 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4749 PrettyDescriptor(super).c_str(), 4750 PrettyDescriptor(klass.Get()).c_str()); 4751 return false; 4752 } 4753 4754 // Inherit kAccClassIsFinalizable from the superclass in case this 4755 // class doesn't override finalize. 4756 if (super->IsFinalizable()) { 4757 klass->SetFinalizable(); 4758 } 4759 4760 // Inherit reference flags (if any) from the superclass. 4761 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4762 if (reference_flags != 0) { 4763 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4764 } 4765 // Disallow custom direct subclasses of java.lang.ref.Reference. 4766 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4767 ThrowLinkageError(klass.Get(), 4768 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4769 PrettyDescriptor(klass.Get()).c_str()); 4770 return false; 4771 } 4772 4773 if (kIsDebugBuild) { 4774 // Ensure super classes are fully resolved prior to resolving fields.. 4775 while (super != nullptr) { 4776 CHECK(super->IsResolved()); 4777 super = super->GetSuperClass(); 4778 } 4779 } 4780 return true; 4781} 4782 4783// Populate the class vtable and itable. Compute return type indices. 4784bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4785 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4786 StackHandleScope<mirror::Class::kImtSize>* out_imt) { 4787 if (klass->IsInterface()) { 4788 // No vtable. 4789 size_t count = klass->NumVirtualMethods(); 4790 if (!IsUint(16, count)) { 4791 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4792 return false; 4793 } 4794 for (size_t i = 0; i < count; ++i) { 4795 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4796 } 4797 } else if (!LinkVirtualMethods(self, klass)) { // Link virtual methods first. 4798 return false; 4799 } 4800 return LinkInterfaceMethods(self, klass, interfaces, out_imt); // Link interface method last. 4801} 4802 4803// Comparator for name and signature of a method, used in finding overriding methods. Implementation 4804// avoids the use of handles, if it didn't then rather than compare dex files we could compare dex 4805// caches in the implementation below. 4806class MethodNameAndSignatureComparator FINAL { 4807 public: 4808 explicit MethodNameAndSignatureComparator(mirror::ArtMethod* method) 4809 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) : 4810 dex_file_(method->GetDexFile()), mid_(&dex_file_->GetMethodId(method->GetDexMethodIndex())), 4811 name_(nullptr), name_len_(0) { 4812 DCHECK(!method->IsProxyMethod()) << PrettyMethod(method); 4813 } 4814 4815 const char* GetName() { 4816 if (name_ == nullptr) { 4817 name_ = dex_file_->StringDataAndUtf16LengthByIdx(mid_->name_idx_, &name_len_); 4818 } 4819 return name_; 4820 } 4821 4822 bool HasSameNameAndSignature(mirror::ArtMethod* other) 4823 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4824 DCHECK(!other->IsProxyMethod()) << PrettyMethod(other); 4825 const DexFile* other_dex_file = other->GetDexFile(); 4826 const DexFile::MethodId& other_mid = other_dex_file->GetMethodId(other->GetDexMethodIndex()); 4827 if (dex_file_ == other_dex_file) { 4828 return mid_->name_idx_ == other_mid.name_idx_ && mid_->proto_idx_ == other_mid.proto_idx_; 4829 } 4830 GetName(); // Only used to make sure its calculated. 4831 uint32_t other_name_len; 4832 const char* other_name = other_dex_file->StringDataAndUtf16LengthByIdx(other_mid.name_idx_, 4833 &other_name_len); 4834 if (name_len_ != other_name_len || strcmp(name_, other_name) != 0) { 4835 return false; 4836 } 4837 return dex_file_->GetMethodSignature(*mid_) == other_dex_file->GetMethodSignature(other_mid); 4838 } 4839 4840 private: 4841 // Dex file for the method to compare against. 4842 const DexFile* const dex_file_; 4843 // MethodId for the method to compare against. 4844 const DexFile::MethodId* const mid_; 4845 // Lazily computed name from the dex file's strings. 4846 const char* name_; 4847 // Lazily computed name length. 4848 uint32_t name_len_; 4849}; 4850 4851class LinkVirtualHashTable { 4852 public: 4853 LinkVirtualHashTable(Handle<mirror::Class> klass, size_t hash_size, uint32_t* hash_table) 4854 : klass_(klass), hash_size_(hash_size), hash_table_(hash_table) { 4855 std::fill(hash_table_, hash_table_ + hash_size_, invalid_index_); 4856 } 4857 void Add(uint32_t virtual_method_index) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4858 mirror::ArtMethod* local_method = klass_->GetVirtualMethodDuringLinking(virtual_method_index); 4859 const char* name = local_method->GetName(); 4860 uint32_t hash = ComputeModifiedUtf8Hash(name); 4861 uint32_t index = hash % hash_size_; 4862 // Linear probe until we have an empty slot. 4863 while (hash_table_[index] != invalid_index_) { 4864 if (++index == hash_size_) { 4865 index = 0; 4866 } 4867 } 4868 hash_table_[index] = virtual_method_index; 4869 } 4870 uint32_t FindAndRemove(MethodNameAndSignatureComparator* comparator) 4871 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4872 const char* name = comparator->GetName(); 4873 uint32_t hash = ComputeModifiedUtf8Hash(name); 4874 size_t index = hash % hash_size_; 4875 while (true) { 4876 const uint32_t value = hash_table_[index]; 4877 // Since linear probe makes continuous blocks, hitting an invalid index means we are done 4878 // the block and can safely assume not found. 4879 if (value == invalid_index_) { 4880 break; 4881 } 4882 if (value != removed_index_) { // This signifies not already overriden. 4883 mirror::ArtMethod* virtual_method = 4884 klass_->GetVirtualMethodDuringLinking(value); 4885 if (comparator->HasSameNameAndSignature(virtual_method->GetInterfaceMethodIfProxy())) { 4886 hash_table_[index] = removed_index_; 4887 return value; 4888 } 4889 } 4890 if (++index == hash_size_) { 4891 index = 0; 4892 } 4893 } 4894 return GetNotFoundIndex(); 4895 } 4896 static uint32_t GetNotFoundIndex() { 4897 return invalid_index_; 4898 } 4899 4900 private: 4901 static const uint32_t invalid_index_; 4902 static const uint32_t removed_index_; 4903 4904 Handle<mirror::Class> klass_; 4905 const size_t hash_size_; 4906 uint32_t* const hash_table_; 4907}; 4908 4909const uint32_t LinkVirtualHashTable::invalid_index_ = std::numeric_limits<uint32_t>::max(); 4910const uint32_t LinkVirtualHashTable::removed_index_ = std::numeric_limits<uint32_t>::max() - 1; 4911 4912bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4913 const size_t num_virtual_methods = klass->NumVirtualMethods(); 4914 if (klass->HasSuperClass()) { 4915 const size_t super_vtable_length = klass->GetSuperClass()->GetVTableLength(); 4916 const size_t max_count = num_virtual_methods + super_vtable_length; 4917 StackHandleScope<2> hs(self); 4918 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4919 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4920 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4921 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4922 if (UNLIKELY(vtable.Get() == nullptr)) { 4923 CHECK(self->IsExceptionPending()); // OOME. 4924 return false; 4925 } 4926 for (size_t i = 0; i < super_vtable_length; i++) { 4927 vtable->SetWithoutChecks<false>(i, super_class->GetEmbeddedVTableEntry(i)); 4928 } 4929 if (num_virtual_methods == 0) { 4930 klass->SetVTable(vtable.Get()); 4931 return true; 4932 } 4933 } else { 4934 mirror::ObjectArray<mirror::ArtMethod>* super_vtable = super_class->GetVTable(); 4935 CHECK(super_vtable != nullptr) << PrettyClass(super_class.Get()); 4936 if (num_virtual_methods == 0) { 4937 klass->SetVTable(super_vtable); 4938 return true; 4939 } 4940 vtable = hs.NewHandle(super_vtable->CopyOf(self, max_count)); 4941 if (UNLIKELY(vtable.Get() == nullptr)) { 4942 CHECK(self->IsExceptionPending()); // OOME. 4943 return false; 4944 } 4945 } 4946 // How the algorithm works: 4947 // 1. Populate hash table by adding num_virtual_methods from klass. The values in the hash 4948 // table are: invalid_index for unused slots, index super_vtable_length + i for a virtual 4949 // method which has not been matched to a vtable method, and j if the virtual method at the 4950 // index overrode the super virtual method at index j. 4951 // 2. Loop through super virtual methods, if they overwrite, update hash table to j 4952 // (j < super_vtable_length) to avoid redundant checks. (TODO maybe use this info for reducing 4953 // the need for the initial vtable which we later shrink back down). 4954 // 3. Add non overridden methods to the end of the vtable. 4955 static constexpr size_t kMaxStackHash = 250; 4956 const size_t hash_table_size = num_virtual_methods * 3; 4957 uint32_t* hash_table_ptr; 4958 std::unique_ptr<uint32_t[]> hash_heap_storage; 4959 if (hash_table_size <= kMaxStackHash) { 4960 hash_table_ptr = reinterpret_cast<uint32_t*>( 4961 alloca(hash_table_size * sizeof(*hash_table_ptr))); 4962 } else { 4963 hash_heap_storage.reset(new uint32_t[hash_table_size]); 4964 hash_table_ptr = hash_heap_storage.get(); 4965 } 4966 LinkVirtualHashTable hash_table(klass, hash_table_size, hash_table_ptr); 4967 // Add virtual methods to the hash table. 4968 for (size_t i = 0; i < num_virtual_methods; ++i) { 4969 hash_table.Add(i); 4970 } 4971 // Loop through each super vtable method and see if they are overriden by a method we added to 4972 // the hash table. 4973 for (size_t j = 0; j < super_vtable_length; ++j) { 4974 // Search the hash table to see if we are overidden by any method. 4975 mirror::ArtMethod* super_method = vtable->GetWithoutChecks(j); 4976 MethodNameAndSignatureComparator super_method_name_comparator( 4977 super_method->GetInterfaceMethodIfProxy()); 4978 uint32_t hash_index = hash_table.FindAndRemove(&super_method_name_comparator); 4979 if (hash_index != hash_table.GetNotFoundIndex()) { 4980 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(hash_index); 4981 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4982 super_method->GetAccessFlags())) { 4983 if (super_method->IsFinal()) { 4984 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4985 PrettyMethod(virtual_method).c_str(), 4986 super_method->GetDeclaringClassDescriptor()); 4987 return false; 4988 } 4989 vtable->SetWithoutChecks<false>(j, virtual_method); 4990 virtual_method->SetMethodIndex(j); 4991 } else { 4992 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(virtual_method) 4993 << " would have incorrectly overridden the package-private method in " 4994 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4995 } 4996 } 4997 } 4998 // Add the non overridden methods at the end. 4999 size_t actual_count = super_vtable_length; 5000 for (size_t i = 0; i < num_virtual_methods; ++i) { 5001 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 5002 size_t method_idx = local_method->GetMethodIndexDuringLinking(); 5003 if (method_idx < super_vtable_length && 5004 local_method == vtable->GetWithoutChecks(method_idx)) { 5005 continue; 5006 } 5007 vtable->SetWithoutChecks<false>(actual_count, local_method); 5008 local_method->SetMethodIndex(actual_count); 5009 ++actual_count; 5010 } 5011 if (!IsUint(16, actual_count)) { 5012 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 5013 return false; 5014 } 5015 // Shrink vtable if possible 5016 CHECK_LE(actual_count, max_count); 5017 if (actual_count < max_count) { 5018 vtable.Assign(vtable->CopyOf(self, actual_count)); 5019 if (UNLIKELY(vtable.Get() == nullptr)) { 5020 CHECK(self->IsExceptionPending()); // OOME. 5021 return false; 5022 } 5023 } 5024 klass->SetVTable(vtable.Get()); 5025 } else { 5026 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 5027 if (!IsUint(16, num_virtual_methods)) { 5028 ThrowClassFormatError(klass.Get(), "Too many methods: %d", 5029 static_cast<int>(num_virtual_methods)); 5030 return false; 5031 } 5032 mirror::ObjectArray<mirror::ArtMethod>* vtable = AllocArtMethodArray(self, num_virtual_methods); 5033 if (UNLIKELY(vtable == nullptr)) { 5034 CHECK(self->IsExceptionPending()); // OOME. 5035 return false; 5036 } 5037 for (size_t i = 0; i < num_virtual_methods; ++i) { 5038 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 5039 vtable->SetWithoutChecks<false>(i, virtual_method); 5040 virtual_method->SetMethodIndex(i & 0xFFFF); 5041 } 5042 klass->SetVTable(vtable); 5043 } 5044 return true; 5045} 5046 5047bool ClassLinker::LinkInterfaceMethods(Thread* self, Handle<mirror::Class> klass, 5048 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 5049 StackHandleScope<mirror::Class::kImtSize>* out_imt) { 5050 StackHandleScope<2> hs(self); 5051 Runtime* const runtime = Runtime::Current(); 5052 const bool has_superclass = klass->HasSuperClass(); 5053 const size_t super_ifcount = has_superclass ? klass->GetSuperClass()->GetIfTableCount() : 0U; 5054 const bool have_interfaces = interfaces.Get() != nullptr; 5055 const size_t num_interfaces = 5056 have_interfaces ? interfaces->GetLength() : klass->NumDirectInterfaces(); 5057 if (num_interfaces == 0) { 5058 if (super_ifcount == 0) { 5059 // Class implements no interfaces. 5060 DCHECK_EQ(klass->GetIfTableCount(), 0); 5061 DCHECK(klass->GetIfTable() == nullptr); 5062 return true; 5063 } 5064 // Class implements same interfaces as parent, are any of these not marker interfaces? 5065 bool has_non_marker_interface = false; 5066 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 5067 for (size_t i = 0; i < super_ifcount; ++i) { 5068 if (super_iftable->GetMethodArrayCount(i) > 0) { 5069 has_non_marker_interface = true; 5070 break; 5071 } 5072 } 5073 // Class just inherits marker interfaces from parent so recycle parent's iftable. 5074 if (!has_non_marker_interface) { 5075 klass->SetIfTable(super_iftable); 5076 return true; 5077 } 5078 } 5079 size_t ifcount = super_ifcount + num_interfaces; 5080 for (size_t i = 0; i < num_interfaces; i++) { 5081 mirror::Class* interface = have_interfaces ? 5082 interfaces->GetWithoutChecks(i) : mirror::Class::GetDirectInterface(self, klass, i); 5083 DCHECK(interface != nullptr); 5084 if (UNLIKELY(!interface->IsInterface())) { 5085 std::string temp; 5086 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 5087 PrettyDescriptor(klass.Get()).c_str(), 5088 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 5089 return false; 5090 } 5091 ifcount += interface->GetIfTableCount(); 5092 } 5093 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 5094 if (UNLIKELY(iftable.Get() == nullptr)) { 5095 CHECK(self->IsExceptionPending()); // OOME. 5096 return false; 5097 } 5098 if (super_ifcount != 0) { 5099 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 5100 for (size_t i = 0; i < super_ifcount; i++) { 5101 mirror::Class* super_interface = super_iftable->GetInterface(i); 5102 iftable->SetInterface(i, super_interface); 5103 } 5104 } 5105 // Flatten the interface inheritance hierarchy. 5106 size_t idx = super_ifcount; 5107 for (size_t i = 0; i < num_interfaces; i++) { 5108 mirror::Class* interface = have_interfaces ? interfaces->Get(i) : 5109 mirror::Class::GetDirectInterface(self, klass, i); 5110 // Check if interface is already in iftable 5111 bool duplicate = false; 5112 for (size_t j = 0; j < idx; j++) { 5113 mirror::Class* existing_interface = iftable->GetInterface(j); 5114 if (existing_interface == interface) { 5115 duplicate = true; 5116 break; 5117 } 5118 } 5119 if (!duplicate) { 5120 // Add this non-duplicate interface. 5121 iftable->SetInterface(idx++, interface); 5122 // Add this interface's non-duplicate super-interfaces. 5123 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 5124 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 5125 bool super_duplicate = false; 5126 for (size_t k = 0; k < idx; k++) { 5127 mirror::Class* existing_interface = iftable->GetInterface(k); 5128 if (existing_interface == super_interface) { 5129 super_duplicate = true; 5130 break; 5131 } 5132 } 5133 if (!super_duplicate) { 5134 iftable->SetInterface(idx++, super_interface); 5135 } 5136 } 5137 } 5138 } 5139 // Shrink iftable in case duplicates were found 5140 if (idx < ifcount) { 5141 DCHECK_NE(num_interfaces, 0U); 5142 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 5143 if (UNLIKELY(iftable.Get() == nullptr)) { 5144 CHECK(self->IsExceptionPending()); // OOME. 5145 return false; 5146 } 5147 ifcount = idx; 5148 } else { 5149 DCHECK_EQ(idx, ifcount); 5150 } 5151 klass->SetIfTable(iftable.Get()); 5152 // If we're an interface, we don't need the vtable pointers, so we're done. 5153 if (klass->IsInterface()) { 5154 return true; 5155 } 5156 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 5157 hs.NewHandle(klass->GetVTableDuringLinking())); 5158 std::vector<mirror::ArtMethod*> miranda_list; 5159 // Copy the IMT from the super class if possible. 5160 bool extend_super_iftable = false; 5161 if (has_superclass) { 5162 mirror::Class* super_class = klass->GetSuperClass(); 5163 extend_super_iftable = true; 5164 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 5165 for (size_t i = 0; i < mirror::Class::kImtSize; ++i) { 5166 out_imt->SetReference(i, super_class->GetEmbeddedImTableEntry(i)); 5167 } 5168 } else { 5169 // No imt in the super class, need to reconstruct from the iftable. 5170 mirror::IfTable* if_table = super_class->GetIfTable(); 5171 mirror::ArtMethod* conflict_method = runtime->GetImtConflictMethod(); 5172 const size_t length = super_class->GetIfTableCount(); 5173 for (size_t i = 0; i < length; ++i) { 5174 mirror::Class* interface = iftable->GetInterface(i); 5175 const size_t num_virtuals = interface->NumVirtualMethods(); 5176 const size_t method_array_count = if_table->GetMethodArrayCount(i); 5177 DCHECK_EQ(num_virtuals, method_array_count); 5178 if (method_array_count == 0) { 5179 continue; 5180 } 5181 mirror::ObjectArray<mirror::ArtMethod>* method_array = if_table->GetMethodArray(i); 5182 for (size_t j = 0; j < num_virtuals; ++j) { 5183 mirror::ArtMethod* method = method_array->GetWithoutChecks(j); 5184 if (method->IsMiranda()) { 5185 continue; 5186 } 5187 mirror::ArtMethod* interface_method = interface->GetVirtualMethod(j); 5188 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 5189 mirror::ArtMethod* imt_ref = out_imt->GetReference(imt_index)->AsArtMethod(); 5190 if (imt_ref == runtime->GetImtUnimplementedMethod()) { 5191 out_imt->SetReference(imt_index, method); 5192 } else if (imt_ref != conflict_method) { 5193 out_imt->SetReference(imt_index, conflict_method); 5194 } 5195 } 5196 } 5197 } 5198 } 5199 for (size_t i = 0; i < ifcount; ++i) { 5200 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 5201 if (num_methods > 0) { 5202 StackHandleScope<2> hs(self); 5203 const bool is_super = i < super_ifcount; 5204 const bool super_interface = is_super && extend_super_iftable; 5205 Handle<mirror::ObjectArray<mirror::ArtMethod>> method_array; 5206 Handle<mirror::ObjectArray<mirror::ArtMethod>> input_array; 5207 if (super_interface) { 5208 mirror::IfTable* if_table = klass->GetSuperClass()->GetIfTable(); 5209 DCHECK(if_table != nullptr); 5210 DCHECK(if_table->GetMethodArray(i) != nullptr); 5211 // If we are working on a super interface, try extending the existing method array. 5212 method_array = hs.NewHandle(if_table->GetMethodArray(i)->Clone(self)-> 5213 AsObjectArray<mirror::ArtMethod>()); 5214 // We are overwriting a super class interface, try to only virtual methods instead of the 5215 // whole vtable. 5216 input_array = hs.NewHandle(klass->GetVirtualMethods()); 5217 } else { 5218 method_array = hs.NewHandle(AllocArtMethodArray(self, num_methods)); 5219 // A new interface, we need the whole vtable incase a new interface method is implemented 5220 // in the whole superclass. 5221 input_array = vtable; 5222 } 5223 if (UNLIKELY(method_array.Get() == nullptr)) { 5224 CHECK(self->IsExceptionPending()); // OOME. 5225 return false; 5226 } 5227 iftable->SetMethodArray(i, method_array.Get()); 5228 if (input_array.Get() == nullptr) { 5229 // If the added virtual methods is empty, do nothing. 5230 DCHECK(super_interface); 5231 continue; 5232 } 5233 for (size_t j = 0; j < num_methods; ++j) { 5234 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 5235 MethodNameAndSignatureComparator interface_name_comparator( 5236 interface_method->GetInterfaceMethodIfProxy()); 5237 int32_t k; 5238 // For each method listed in the interface's method list, find the 5239 // matching method in our class's method list. We want to favor the 5240 // subclass over the superclass, which just requires walking 5241 // back from the end of the vtable. (This only matters if the 5242 // superclass defines a private method and this class redefines 5243 // it -- otherwise it would use the same vtable slot. In .dex files 5244 // those don't end up in the virtual method table, so it shouldn't 5245 // matter which direction we go. We walk it backward anyway.) 5246 for (k = input_array->GetLength() - 1; k >= 0; --k) { 5247 mirror::ArtMethod* vtable_method = input_array->GetWithoutChecks(k); 5248 mirror::ArtMethod* vtable_method_for_name_comparison = 5249 vtable_method->GetInterfaceMethodIfProxy(); 5250 if (interface_name_comparator.HasSameNameAndSignature( 5251 vtable_method_for_name_comparison)) { 5252 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 5253 ThrowIllegalAccessError( 5254 klass.Get(), 5255 "Method '%s' implementing interface method '%s' is not public", 5256 PrettyMethod(vtable_method).c_str(), 5257 PrettyMethod(interface_method).c_str()); 5258 return false; 5259 } 5260 method_array->SetWithoutChecks<false>(j, vtable_method); 5261 // Place method in imt if entry is empty, place conflict otherwise. 5262 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 5263 mirror::ArtMethod* imt_ref = out_imt->GetReference(imt_index)->AsArtMethod(); 5264 mirror::ArtMethod* conflict_method = runtime->GetImtConflictMethod(); 5265 if (imt_ref == runtime->GetImtUnimplementedMethod()) { 5266 out_imt->SetReference(imt_index, vtable_method); 5267 } else if (imt_ref != conflict_method) { 5268 // If we are not a conflict and we have the same signature and name as the imt entry, 5269 // it must be that we overwrote a superclass vtable entry. 5270 MethodNameAndSignatureComparator imt_ref_name_comparator( 5271 imt_ref->GetInterfaceMethodIfProxy()); 5272 if (imt_ref_name_comparator.HasSameNameAndSignature( 5273 vtable_method_for_name_comparison)) { 5274 out_imt->SetReference(imt_index, vtable_method); 5275 } else { 5276 out_imt->SetReference(imt_index, conflict_method); 5277 } 5278 } 5279 break; 5280 } 5281 } 5282 if (k < 0 && !super_interface) { 5283 mirror::ArtMethod* miranda_method = nullptr; 5284 for (mirror::ArtMethod* mir_method : miranda_list) { 5285 if (interface_name_comparator.HasSameNameAndSignature( 5286 mir_method->GetInterfaceMethodIfProxy())) { 5287 miranda_method = mir_method; 5288 break; 5289 } 5290 } 5291 if (miranda_method == nullptr) { 5292 // Point the interface table at a phantom slot. 5293 miranda_method = down_cast<mirror::ArtMethod*>(interface_method->Clone(self)); 5294 if (UNLIKELY(miranda_method == nullptr)) { 5295 CHECK(self->IsExceptionPending()); // OOME. 5296 return false; 5297 } 5298 // TODO: If a methods move then the miranda_list may hold stale references. 5299 miranda_list.push_back(miranda_method); 5300 } 5301 method_array->SetWithoutChecks<false>(j, miranda_method); 5302 } 5303 } 5304 } 5305 } 5306 if (!miranda_list.empty()) { 5307 int old_method_count = klass->NumVirtualMethods(); 5308 int new_method_count = old_method_count + miranda_list.size(); 5309 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 5310 if (old_method_count == 0) { 5311 virtuals = AllocArtMethodArray(self, new_method_count); 5312 } else { 5313 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 5314 } 5315 if (UNLIKELY(virtuals == nullptr)) { 5316 CHECK(self->IsExceptionPending()); // OOME. 5317 return false; 5318 } 5319 klass->SetVirtualMethods(virtuals); 5320 5321 int old_vtable_count = vtable->GetLength(); 5322 int new_vtable_count = old_vtable_count + miranda_list.size(); 5323 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 5324 if (UNLIKELY(vtable.Get() == nullptr)) { 5325 CHECK(self->IsExceptionPending()); // OOME. 5326 return false; 5327 } 5328 for (size_t i = 0; i < miranda_list.size(); ++i) { 5329 mirror::ArtMethod* method = miranda_list[i]; 5330 // Leave the declaring class alone as type indices are relative to it 5331 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 5332 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 5333 klass->SetVirtualMethod(old_method_count + i, method); 5334 vtable->SetWithoutChecks<false>(old_vtable_count + i, method); 5335 } 5336 // TODO: do not assign to the vtable field until it is fully constructed. 5337 klass->SetVTable(vtable.Get()); 5338 } 5339 5340 if (kIsDebugBuild) { 5341 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 5342 for (int i = 0; i < vtable->GetLength(); ++i) { 5343 CHECK(vtable->GetWithoutChecks(i) != nullptr); 5344 } 5345 } 5346 5347 return true; 5348} 5349 5350bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 5351 CHECK(klass.Get() != nullptr); 5352 return LinkFields(klass, false, nullptr); 5353} 5354 5355bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass, size_t* class_size) { 5356 CHECK(klass.Get() != nullptr); 5357 return LinkFields(klass, true, class_size); 5358} 5359 5360struct LinkFieldsComparator { 5361 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 5362 } 5363 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 5364 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 5365 NO_THREAD_SAFETY_ANALYSIS { 5366 // First come reference fields, then 64-bit, and finally 32-bit 5367 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 5368 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 5369 if (type1 != type2) { 5370 if (type1 == Primitive::kPrimNot) { 5371 // Reference always goes first. 5372 return true; 5373 } 5374 if (type2 == Primitive::kPrimNot) { 5375 // Reference always goes first. 5376 return false; 5377 } 5378 size_t size1 = Primitive::ComponentSize(type1); 5379 size_t size2 = Primitive::ComponentSize(type2); 5380 if (size1 != size2) { 5381 // Larger primitive types go first. 5382 return size1 > size2; 5383 } 5384 // Primitive types differ but sizes match. Arbitrarily order by primitive type. 5385 return type1 < type2; 5386 } 5387 // Same basic group? Then sort by dex field index. This is guaranteed to be sorted 5388 // by name and for equal names by type id index. 5389 // NOTE: This works also for proxies. Their static fields are assigned appropriate indexes. 5390 return field1->GetDexFieldIndex() < field2->GetDexFieldIndex(); 5391 } 5392}; 5393 5394bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static, size_t* class_size) { 5395 size_t num_fields = 5396 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 5397 5398 mirror::ObjectArray<mirror::ArtField>* fields = 5399 is_static ? klass->GetSFields() : klass->GetIFields(); 5400 5401 // Initialize field_offset 5402 MemberOffset field_offset(0); 5403 if (is_static) { 5404 field_offset = klass->GetFirstReferenceStaticFieldOffsetDuringLinking(); 5405 } else { 5406 mirror::Class* super_class = klass->GetSuperClass(); 5407 if (super_class != nullptr) { 5408 CHECK(super_class->IsResolved()) 5409 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 5410 field_offset = MemberOffset(super_class->GetObjectSize()); 5411 } 5412 } 5413 5414 CHECK_EQ(num_fields == 0, fields == nullptr) << PrettyClass(klass.Get()); 5415 5416 // we want a relatively stable order so that adding new fields 5417 // minimizes disruption of C++ version such as Class and Method. 5418 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 5419 for (size_t i = 0; i < num_fields; i++) { 5420 mirror::ArtField* f = fields->Get(i); 5421 CHECK(f != nullptr) << PrettyClass(klass.Get()); 5422 grouped_and_sorted_fields.push_back(f); 5423 } 5424 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 5425 LinkFieldsComparator()); 5426 5427 // References should be at the front. 5428 size_t current_field = 0; 5429 size_t num_reference_fields = 0; 5430 for (; current_field < num_fields; current_field++) { 5431 mirror::ArtField* field = grouped_and_sorted_fields.front(); 5432 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5433 bool isPrimitive = type != Primitive::kPrimNot; 5434 if (isPrimitive) { 5435 break; // past last reference, move on to the next phase 5436 } 5437 grouped_and_sorted_fields.pop_front(); 5438 num_reference_fields++; 5439 field->SetOffset(field_offset); 5440 field_offset = MemberOffset(field_offset.Uint32Value() + 5441 sizeof(mirror::HeapReference<mirror::Object>)); 5442 } 5443 5444 // Now we want to pack all of the double-wide fields together. If 5445 // we're not aligned, though, we want to shuffle one 32-bit field 5446 // into place. If we can't find one, we'll have to pad it. 5447 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 5448 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 5449 mirror::ArtField* field = grouped_and_sorted_fields[i]; 5450 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5451 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 5452 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 5453 continue; 5454 } 5455 current_field++; 5456 field->SetOffset(field_offset); 5457 // drop the consumed field 5458 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 5459 break; 5460 } 5461 // whether we found a 32-bit field for padding or not, we advance 5462 field_offset = MemberOffset(field_offset.Uint32Value() + 5463 sizeof(mirror::HeapReference<mirror::Object>)); 5464 } 5465 5466 // Alignment is good, shuffle any double-wide fields forward, and 5467 // finish assigning field offsets to all fields. 5468 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 5469 << PrettyClass(klass.Get()); 5470 while (!grouped_and_sorted_fields.empty()) { 5471 mirror::ArtField* field = grouped_and_sorted_fields.front(); 5472 grouped_and_sorted_fields.pop_front(); 5473 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5474 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 5475 field->SetOffset(field_offset); 5476 field_offset = MemberOffset(field_offset.Uint32Value() + 5477 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 5478 ? sizeof(uint64_t) 5479 : sizeof(uint32_t))); 5480 current_field++; 5481 } 5482 5483 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 5484 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 5485 // We know there are no non-reference fields in the Reference classes, and we know 5486 // that 'referent' is alphabetically last, so this is easy... 5487 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 5488 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 5489 --num_reference_fields; 5490 } 5491 5492 size_t size = field_offset.Uint32Value(); 5493 // Update klass 5494 if (is_static) { 5495 klass->SetNumReferenceStaticFields(num_reference_fields); 5496 *class_size = size; 5497 } else { 5498 klass->SetNumReferenceInstanceFields(num_reference_fields); 5499 if (!klass->IsVariableSize()) { 5500 if (klass->DescriptorEquals("Ljava/lang/reflect/ArtMethod;")) { 5501 klass->SetObjectSize(mirror::ArtMethod::InstanceSize(sizeof(void*))); 5502 } else { 5503 std::string temp; 5504 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 5505 size_t previous_size = klass->GetObjectSize(); 5506 if (previous_size != 0) { 5507 // Make sure that we didn't originally have an incorrect size. 5508 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 5509 } 5510 klass->SetObjectSize(size); 5511 } 5512 } 5513 } 5514 5515 if (kIsDebugBuild) { 5516 // Make sure that the fields array is ordered by name but all reference 5517 // offsets are at the beginning as far as alignment allows. 5518 MemberOffset start_ref_offset = is_static 5519 ? klass->GetFirstReferenceStaticFieldOffsetDuringLinking() 5520 : klass->GetFirstReferenceInstanceFieldOffset(); 5521 MemberOffset end_ref_offset(start_ref_offset.Uint32Value() + 5522 num_reference_fields * 5523 sizeof(mirror::HeapReference<mirror::Object>)); 5524 MemberOffset current_ref_offset = start_ref_offset; 5525 for (size_t i = 0; i < num_fields; i++) { 5526 mirror::ArtField* field = fields->Get(i); 5527 if (false) { // enable to debug field layout 5528 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 5529 << " class=" << PrettyClass(klass.Get()) 5530 << " field=" << PrettyField(field) 5531 << " offset=" 5532 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 5533 } 5534 if (i != 0) { 5535 mirror::ArtField* prev_field = fields->Get(i - 1u); 5536 // NOTE: The field names can be the same. This is not possible in the Java language 5537 // but it's valid Java/dex bytecode and for example proguard can generate such bytecode. 5538 CHECK_LE(strcmp(prev_field->GetName(), field->GetName()), 0); 5539 } 5540 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5541 bool is_primitive = type != Primitive::kPrimNot; 5542 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 5543 strcmp("referent", field->GetName()) == 0) { 5544 is_primitive = true; // We lied above, so we have to expect a lie here. 5545 } 5546 MemberOffset offset = field->GetOffsetDuringLinking(); 5547 if (is_primitive) { 5548 if (offset.Uint32Value() < end_ref_offset.Uint32Value()) { 5549 // Shuffled before references. 5550 size_t type_size = Primitive::ComponentSize(type); 5551 CHECK_LT(type_size, sizeof(mirror::HeapReference<mirror::Object>)); 5552 CHECK_LT(offset.Uint32Value(), start_ref_offset.Uint32Value()); 5553 CHECK_LE(offset.Uint32Value() + type_size, start_ref_offset.Uint32Value()); 5554 CHECK(!IsAligned<sizeof(mirror::HeapReference<mirror::Object>)>(offset.Uint32Value())); 5555 } 5556 } else { 5557 CHECK_EQ(current_ref_offset.Uint32Value(), offset.Uint32Value()); 5558 current_ref_offset = MemberOffset(current_ref_offset.Uint32Value() + 5559 sizeof(mirror::HeapReference<mirror::Object>)); 5560 } 5561 } 5562 CHECK_EQ(current_ref_offset.Uint32Value(), end_ref_offset.Uint32Value()); 5563 } 5564 return true; 5565} 5566 5567// Set the bitmap of reference instance field offsets. 5568void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 5569 uint32_t reference_offsets = 0; 5570 mirror::Class* super_class = klass->GetSuperClass(); 5571 if (super_class != nullptr) { 5572 reference_offsets = super_class->GetReferenceInstanceOffsets(); 5573 // If our superclass overflowed, we don't stand a chance. 5574 if (reference_offsets == CLASS_WALK_SUPER) { 5575 klass->SetReferenceInstanceOffsets(reference_offsets); 5576 return; 5577 } 5578 } 5579 CreateReferenceOffsets(klass, false, reference_offsets); 5580} 5581 5582void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 5583 CreateReferenceOffsets(klass, true, 0); 5584} 5585 5586void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 5587 uint32_t reference_offsets) { 5588 size_t num_reference_fields = 5589 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 5590 : klass->NumReferenceInstanceFieldsDuringLinking(); 5591 if (num_reference_fields != 0u) { 5592 // All of the fields that contain object references are guaranteed be grouped in memory 5593 // starting at an appropriately aligned address after super class object data for instances 5594 // and after the basic class data for classes. 5595 uint32_t start_offset = 5596 !is_static 5597 ? klass->GetFirstReferenceInstanceFieldOffset().Uint32Value() 5598 // Can't use klass->GetFirstReferenceStaticFieldOffset() yet. 5599 : klass->ShouldHaveEmbeddedImtAndVTable() 5600 ? mirror::Class::ComputeClassSize( 5601 true, klass->GetVTableDuringLinking()->GetLength(), 0, 0, 0) 5602 : sizeof(mirror::Class); 5603 uint32_t start_bit = start_offset / sizeof(mirror::HeapReference<mirror::Object>); 5604 if (start_bit + num_reference_fields > 32) { 5605 reference_offsets = CLASS_WALK_SUPER; 5606 } else { 5607 reference_offsets |= (0xffffffffu >> start_bit) & 5608 (0xffffffffu << (32 - (start_bit + num_reference_fields))); 5609 } 5610 } 5611 // Update fields in klass 5612 if (is_static) { 5613 klass->SetReferenceStaticOffsets(reference_offsets); 5614 } else { 5615 klass->SetReferenceInstanceOffsets(reference_offsets); 5616 } 5617} 5618 5619mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 5620 Handle<mirror::DexCache> dex_cache) { 5621 DCHECK(dex_cache.Get() != nullptr); 5622 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 5623 if (resolved != nullptr) { 5624 return resolved; 5625 } 5626 uint32_t utf16_length; 5627 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 5628 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 5629 dex_cache->SetResolvedString(string_idx, string); 5630 return string; 5631} 5632 5633mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5634 mirror::Class* referrer) { 5635 StackHandleScope<2> hs(Thread::Current()); 5636 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 5637 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 5638 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 5639} 5640 5641mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5642 Handle<mirror::DexCache> dex_cache, 5643 Handle<mirror::ClassLoader> class_loader) { 5644 DCHECK(dex_cache.Get() != nullptr); 5645 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 5646 if (resolved == nullptr) { 5647 Thread* self = Thread::Current(); 5648 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 5649 resolved = FindClass(self, descriptor, class_loader); 5650 if (resolved != nullptr) { 5651 // TODO: we used to throw here if resolved's class loader was not the 5652 // boot class loader. This was to permit different classes with the 5653 // same name to be loaded simultaneously by different loaders 5654 dex_cache->SetResolvedType(type_idx, resolved); 5655 } else { 5656 CHECK(self->IsExceptionPending()) 5657 << "Expected pending exception for failed resolution of: " << descriptor; 5658 // Convert a ClassNotFoundException to a NoClassDefFoundError. 5659 StackHandleScope<1> hs(self); 5660 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 5661 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 5662 DCHECK(resolved == nullptr); // No Handle needed to preserve resolved. 5663 self->ClearException(); 5664 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 5665 self->GetException(nullptr)->SetCause(cause.Get()); 5666 } 5667 } 5668 } 5669 DCHECK((resolved == nullptr) || resolved->IsResolved() || resolved->IsErroneous()) 5670 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 5671 return resolved; 5672} 5673 5674mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 5675 Handle<mirror::DexCache> dex_cache, 5676 Handle<mirror::ClassLoader> class_loader, 5677 Handle<mirror::ArtMethod> referrer, 5678 InvokeType type) { 5679 DCHECK(dex_cache.Get() != nullptr); 5680 // Check for hit in the dex cache. 5681 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 5682 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 5683 return resolved; 5684 } 5685 // Fail, get the declaring class. 5686 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5687 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 5688 if (klass == nullptr) { 5689 DCHECK(Thread::Current()->IsExceptionPending()); 5690 return nullptr; 5691 } 5692 // Scan using method_idx, this saves string compares but will only hit for matching dex 5693 // caches/files. 5694 switch (type) { 5695 case kDirect: // Fall-through. 5696 case kStatic: 5697 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5698 break; 5699 case kInterface: 5700 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5701 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5702 break; 5703 case kSuper: // Fall-through. 5704 case kVirtual: 5705 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5706 break; 5707 default: 5708 LOG(FATAL) << "Unreachable - invocation type: " << type; 5709 } 5710 if (resolved == nullptr) { 5711 // Search by name, which works across dex files. 5712 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5713 const Signature signature = dex_file.GetMethodSignature(method_id); 5714 switch (type) { 5715 case kDirect: // Fall-through. 5716 case kStatic: 5717 resolved = klass->FindDirectMethod(name, signature); 5718 break; 5719 case kInterface: 5720 resolved = klass->FindInterfaceMethod(name, signature); 5721 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5722 break; 5723 case kSuper: // Fall-through. 5724 case kVirtual: 5725 resolved = klass->FindVirtualMethod(name, signature); 5726 break; 5727 } 5728 } 5729 // If we found a method, check for incompatible class changes. 5730 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5731 // Be a good citizen and update the dex cache to speed subsequent calls. 5732 dex_cache->SetResolvedMethod(method_idx, resolved); 5733 return resolved; 5734 } else { 5735 // If we had a method, it's an incompatible-class-change error. 5736 if (resolved != nullptr) { 5737 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5738 } else { 5739 // We failed to find the method which means either an access error, an incompatible class 5740 // change, or no such method. First try to find the method among direct and virtual methods. 5741 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5742 const Signature signature = dex_file.GetMethodSignature(method_id); 5743 switch (type) { 5744 case kDirect: 5745 case kStatic: 5746 resolved = klass->FindVirtualMethod(name, signature); 5747 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5748 // have had a resolved method before, which triggers the "true" branch above. 5749 break; 5750 case kInterface: 5751 case kVirtual: 5752 case kSuper: 5753 resolved = klass->FindDirectMethod(name, signature); 5754 break; 5755 } 5756 5757 // If we found something, check that it can be accessed by the referrer. 5758 if (resolved != nullptr && referrer.Get() != nullptr) { 5759 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5760 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5761 if (!referring_class->CanAccess(methods_class)) { 5762 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5763 resolved, type); 5764 return nullptr; 5765 } else if (!referring_class->CanAccessMember(methods_class, 5766 resolved->GetAccessFlags())) { 5767 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5768 return nullptr; 5769 } 5770 } 5771 5772 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 5773 // methods and throw if we find the method there. If we find nothing, throw a 5774 // NoSuchMethodError. 5775 switch (type) { 5776 case kDirect: 5777 case kStatic: 5778 if (resolved != nullptr) { 5779 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5780 } else { 5781 resolved = klass->FindInterfaceMethod(name, signature); 5782 if (resolved != nullptr) { 5783 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5784 } else { 5785 ThrowNoSuchMethodError(type, klass, name, signature); 5786 } 5787 } 5788 break; 5789 case kInterface: 5790 if (resolved != nullptr) { 5791 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5792 } else { 5793 resolved = klass->FindVirtualMethod(name, signature); 5794 if (resolved != nullptr) { 5795 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5796 } else { 5797 ThrowNoSuchMethodError(type, klass, name, signature); 5798 } 5799 } 5800 break; 5801 case kSuper: 5802 if (resolved != nullptr) { 5803 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5804 } else { 5805 ThrowNoSuchMethodError(type, klass, name, signature); 5806 } 5807 break; 5808 case kVirtual: 5809 if (resolved != nullptr) { 5810 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5811 } else { 5812 resolved = klass->FindInterfaceMethod(name, signature); 5813 if (resolved != nullptr) { 5814 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5815 } else { 5816 ThrowNoSuchMethodError(type, klass, name, signature); 5817 } 5818 } 5819 break; 5820 } 5821 } 5822 DCHECK(Thread::Current()->IsExceptionPending()); 5823 return nullptr; 5824 } 5825} 5826 5827mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5828 Handle<mirror::DexCache> dex_cache, 5829 Handle<mirror::ClassLoader> class_loader, 5830 bool is_static) { 5831 DCHECK(dex_cache.Get() != nullptr); 5832 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5833 if (resolved != nullptr) { 5834 return resolved; 5835 } 5836 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5837 Thread* const self = Thread::Current(); 5838 StackHandleScope<1> hs(self); 5839 Handle<mirror::Class> klass( 5840 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5841 if (klass.Get() == nullptr) { 5842 DCHECK(Thread::Current()->IsExceptionPending()); 5843 return nullptr; 5844 } 5845 5846 if (is_static) { 5847 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5848 } else { 5849 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5850 } 5851 5852 if (resolved == nullptr) { 5853 const char* name = dex_file.GetFieldName(field_id); 5854 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5855 if (is_static) { 5856 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5857 } else { 5858 resolved = klass->FindInstanceField(name, type); 5859 } 5860 if (resolved == nullptr) { 5861 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5862 return nullptr; 5863 } 5864 } 5865 dex_cache->SetResolvedField(field_idx, resolved); 5866 return resolved; 5867} 5868 5869mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5870 uint32_t field_idx, 5871 Handle<mirror::DexCache> dex_cache, 5872 Handle<mirror::ClassLoader> class_loader) { 5873 DCHECK(dex_cache.Get() != nullptr); 5874 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5875 if (resolved != nullptr) { 5876 return resolved; 5877 } 5878 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5879 Thread* self = Thread::Current(); 5880 StackHandleScope<1> hs(self); 5881 Handle<mirror::Class> klass( 5882 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5883 if (klass.Get() == nullptr) { 5884 DCHECK(Thread::Current()->IsExceptionPending()); 5885 return nullptr; 5886 } 5887 5888 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5889 StringPiece type(dex_file.StringDataByIdx( 5890 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5891 resolved = mirror::Class::FindField(self, klass, name, type); 5892 if (resolved != nullptr) { 5893 dex_cache->SetResolvedField(field_idx, resolved); 5894 } else { 5895 ThrowNoSuchFieldError("", klass.Get(), type, name); 5896 } 5897 return resolved; 5898} 5899 5900const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5901 uint32_t* length) { 5902 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5903 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5904 const DexFile& dex_file = *dex_cache->GetDexFile(); 5905 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5906 return dex_file.GetMethodShorty(method_id, length); 5907} 5908 5909void ClassLinker::DumpAllClasses(int flags) { 5910 if (dex_cache_image_class_lookup_required_) { 5911 MoveImageClassesToClassTable(); 5912 } 5913 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5914 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5915 std::vector<mirror::Class*> all_classes; 5916 { 5917 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5918 for (GcRoot<mirror::Class>& it : class_table_) { 5919 all_classes.push_back(it.Read()); 5920 } 5921 } 5922 5923 for (size_t i = 0; i < all_classes.size(); ++i) { 5924 all_classes[i]->DumpClass(std::cerr, flags); 5925 } 5926} 5927 5928void ClassLinker::DumpForSigQuit(std::ostream& os) { 5929 if (dex_cache_image_class_lookup_required_) { 5930 MoveImageClassesToClassTable(); 5931 } 5932 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5933 os << "Zygote loaded classes=" << pre_zygote_class_table_.Size() << " post zygote classes=" 5934 << class_table_.Size() << "\n"; 5935} 5936 5937size_t ClassLinker::NumLoadedClasses() { 5938 if (dex_cache_image_class_lookup_required_) { 5939 MoveImageClassesToClassTable(); 5940 } 5941 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5942 // Only return non zygote classes since these are the ones which apps which care about. 5943 return class_table_.Size(); 5944} 5945 5946pid_t ClassLinker::GetClassesLockOwner() { 5947 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5948} 5949 5950pid_t ClassLinker::GetDexLockOwner() { 5951 return dex_lock_.GetExclusiveOwnerTid(); 5952} 5953 5954void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5955 DCHECK(!init_done_); 5956 5957 DCHECK(klass != nullptr); 5958 DCHECK(klass->GetClassLoader() == nullptr); 5959 5960 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5961 DCHECK(class_roots != nullptr); 5962 DCHECK(class_roots->Get(class_root) == nullptr); 5963 class_roots->Set<false>(class_root, klass); 5964} 5965 5966std::size_t ClassLinker::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& root) 5967 const { 5968 std::string temp; 5969 return ComputeModifiedUtf8Hash(root.Read()->GetDescriptor(&temp)); 5970} 5971 5972bool ClassLinker::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& a, 5973 const GcRoot<mirror::Class>& b) { 5974 if (a.Read()->GetClassLoader() != b.Read()->GetClassLoader()) { 5975 return false; 5976 } 5977 std::string temp; 5978 return a.Read()->DescriptorEquals(b.Read()->GetDescriptor(&temp)); 5979} 5980 5981std::size_t ClassLinker::ClassDescriptorHashEquals::operator()( 5982 const std::pair<const char*, mirror::ClassLoader*>& element) const { 5983 return ComputeModifiedUtf8Hash(element.first); 5984} 5985 5986bool ClassLinker::ClassDescriptorHashEquals::operator()( 5987 const GcRoot<mirror::Class>& a, const std::pair<const char*, mirror::ClassLoader*>& b) { 5988 if (a.Read()->GetClassLoader() != b.second) { 5989 return false; 5990 } 5991 return a.Read()->DescriptorEquals(b.first); 5992} 5993 5994bool ClassLinker::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& a, 5995 const char* descriptor) { 5996 return a.Read()->DescriptorEquals(descriptor); 5997} 5998 5999std::size_t ClassLinker::ClassDescriptorHashEquals::operator()(const char* descriptor) const { 6000 return ComputeModifiedUtf8Hash(descriptor); 6001} 6002 6003} // namespace art 6004