class_linker.cc revision ca3459398018360d9968a52eebf727df085caf83
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <fcntl.h> 20#include <sys/file.h> 21#include <sys/stat.h> 22#include <deque> 23#include <memory> 24#include <string> 25#include <utility> 26#include <vector> 27 28#include "base/casts.h" 29#include "base/logging.h" 30#include "base/scoped_flock.h" 31#include "base/stl_util.h" 32#include "base/unix_file/fd_file.h" 33#include "class_linker-inl.h" 34#include "compiler_callbacks.h" 35#include "debugger.h" 36#include "dex_file-inl.h" 37#include "gc_root-inl.h" 38#include "gc/accounting/card_table-inl.h" 39#include "gc/accounting/heap_bitmap.h" 40#include "gc/heap.h" 41#include "gc/space/image_space.h" 42#include "handle_scope.h" 43#include "intern_table.h" 44#include "interpreter/interpreter.h" 45#include "leb128.h" 46#include "method_helper-inl.h" 47#include "oat.h" 48#include "oat_file.h" 49#include "object_lock.h" 50#include "mirror/art_field-inl.h" 51#include "mirror/art_method-inl.h" 52#include "mirror/class.h" 53#include "mirror/class-inl.h" 54#include "mirror/class_loader.h" 55#include "mirror/dex_cache-inl.h" 56#include "mirror/iftable-inl.h" 57#include "mirror/object-inl.h" 58#include "mirror/object_array-inl.h" 59#include "mirror/proxy.h" 60#include "mirror/reference-inl.h" 61#include "mirror/stack_trace_element.h" 62#include "mirror/string-inl.h" 63#include "os.h" 64#include "runtime.h" 65#include "entrypoints/entrypoint_utils.h" 66#include "ScopedLocalRef.h" 67#include "scoped_thread_state_change.h" 68#include "handle_scope-inl.h" 69#include "thread.h" 70#include "utils.h" 71#include "verifier/method_verifier.h" 72#include "well_known_classes.h" 73 74namespace art { 75 76static void ThrowNoClassDefFoundError(const char* fmt, ...) 77 __attribute__((__format__(__printf__, 1, 2))) 78 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 79static void ThrowNoClassDefFoundError(const char* fmt, ...) { 80 va_list args; 81 va_start(args, fmt); 82 Thread* self = Thread::Current(); 83 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 84 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 85 va_end(args); 86} 87 88static void ThrowEarlierClassFailure(mirror::Class* c) 89 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 90 // The class failed to initialize on a previous attempt, so we want to throw 91 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 92 // failed in verification, in which case v2 5.4.1 says we need to re-throw 93 // the previous error. 94 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 95 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 96 } 97 98 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 99 Thread* self = Thread::Current(); 100 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 101 if (c->GetVerifyErrorClass() != NULL) { 102 // TODO: change the verifier to store an _instance_, with a useful detail message? 103 std::string temp; 104 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 105 PrettyDescriptor(c).c_str()); 106 } else { 107 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 108 PrettyDescriptor(c).c_str()); 109 } 110} 111 112static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 113 Thread* self = Thread::Current(); 114 JNIEnv* env = self->GetJniEnv(); 115 116 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 117 CHECK(cause.get() != NULL); 118 119 env->ExceptionClear(); 120 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 121 env->Throw(cause.get()); 122 123 // We only wrap non-Error exceptions; an Error can just be used as-is. 124 if (!is_error) { 125 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 126 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 127 } 128} 129 130static size_t Hash(const char* s) { 131 // This is the java.lang.String hashcode for convenience, not interoperability. 132 size_t hash = 0; 133 for (; *s != '\0'; ++s) { 134 hash = hash * 31 + *s; 135 } 136 return hash; 137} 138 139const char* ClassLinker::class_roots_descriptors_[] = { 140 "Ljava/lang/Class;", 141 "Ljava/lang/Object;", 142 "[Ljava/lang/Class;", 143 "[Ljava/lang/Object;", 144 "Ljava/lang/String;", 145 "Ljava/lang/DexCache;", 146 "Ljava/lang/ref/Reference;", 147 "Ljava/lang/reflect/ArtField;", 148 "Ljava/lang/reflect/ArtMethod;", 149 "Ljava/lang/reflect/Proxy;", 150 "[Ljava/lang/String;", 151 "[Ljava/lang/reflect/ArtField;", 152 "[Ljava/lang/reflect/ArtMethod;", 153 "Ljava/lang/ClassLoader;", 154 "Ljava/lang/Throwable;", 155 "Ljava/lang/ClassNotFoundException;", 156 "Ljava/lang/StackTraceElement;", 157 "Z", 158 "B", 159 "C", 160 "D", 161 "F", 162 "I", 163 "J", 164 "S", 165 "V", 166 "[Z", 167 "[B", 168 "[C", 169 "[D", 170 "[F", 171 "[I", 172 "[J", 173 "[S", 174 "[Ljava/lang/StackTraceElement;", 175}; 176 177ClassLinker::ClassLinker(InternTable* intern_table) 178 // dex_lock_ is recursive as it may be used in stack dumping. 179 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 180 dex_cache_image_class_lookup_required_(false), 181 failed_dex_cache_class_lookups_(0), 182 class_roots_(nullptr), 183 array_iftable_(nullptr), 184 find_array_class_cache_next_victim_(0), 185 init_done_(false), 186 log_new_dex_caches_roots_(false), 187 log_new_class_table_roots_(false), 188 intern_table_(intern_table), 189 portable_resolution_trampoline_(nullptr), 190 quick_resolution_trampoline_(nullptr), 191 portable_imt_conflict_trampoline_(nullptr), 192 quick_imt_conflict_trampoline_(nullptr), 193 quick_generic_jni_trampoline_(nullptr), 194 quick_to_interpreter_bridge_trampoline_(nullptr) { 195 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 196 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 197} 198 199// To set a value for generic JNI. May be necessary in compiler tests. 200extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 201extern "C" void art_quick_resolution_trampoline(mirror::ArtMethod*); 202extern "C" void art_quick_imt_conflict_trampoline(mirror::ArtMethod*); 203extern "C" void art_quick_to_interpreter_bridge(mirror::ArtMethod*); 204 205void ClassLinker::InitWithoutImage(const std::vector<const DexFile*>& boot_class_path) { 206 VLOG(startup) << "ClassLinker::Init"; 207 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 208 209 CHECK(!init_done_); 210 211 // java_lang_Class comes first, it's needed for AllocClass 212 Thread* self = Thread::Current(); 213 gc::Heap* heap = Runtime::Current()->GetHeap(); 214 // The GC can't handle an object with a null class since we can't get the size of this object. 215 heap->IncrementDisableMovingGC(self); 216 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 217 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 218 heap->AllocNonMovableObject<true>(self, nullptr, 219 mirror::Class::ClassClassSize(), 220 VoidFunctor())))); 221 CHECK(java_lang_Class.Get() != NULL); 222 mirror::Class::SetClassClass(java_lang_Class.Get()); 223 java_lang_Class->SetClass(java_lang_Class.Get()); 224 if (kUseBakerOrBrooksReadBarrier) { 225 java_lang_Class->AssertReadBarrierPointer(); 226 } 227 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 228 heap->DecrementDisableMovingGC(self); 229 // AllocClass(mirror::Class*) can now be used 230 231 // Class[] is used for reflection support. 232 Handle<mirror::Class> class_array_class(hs.NewHandle( 233 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 234 class_array_class->SetComponentType(java_lang_Class.Get()); 235 236 // java_lang_Object comes next so that object_array_class can be created. 237 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 238 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 239 CHECK(java_lang_Object.Get() != NULL); 240 // backfill Object as the super class of Class. 241 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 242 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 243 244 // Object[] next to hold class roots. 245 Handle<mirror::Class> object_array_class(hs.NewHandle( 246 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 247 object_array_class->SetComponentType(java_lang_Object.Get()); 248 249 // Setup the char (primitive) class to be used for char[]. 250 Handle<mirror::Class> char_class(hs.NewHandle( 251 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 252 253 // Setup the char[] class to be used for String. 254 Handle<mirror::Class> char_array_class(hs.NewHandle( 255 AllocClass(self, java_lang_Class.Get(), 256 mirror::Array::ClassSize()))); 257 char_array_class->SetComponentType(char_class.Get()); 258 mirror::CharArray::SetArrayClass(char_array_class.Get()); 259 260 // Setup String. 261 Handle<mirror::Class> java_lang_String(hs.NewHandle( 262 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 263 mirror::String::SetClass(java_lang_String.Get()); 264 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 265 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 266 267 // Setup Reference. 268 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 269 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 270 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 271 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 272 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 273 274 // Create storage for root classes, save away our work so far (requires descriptors). 275 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 276 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 277 kClassRootsMax)); 278 CHECK(!class_roots_.IsNull()); 279 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 280 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 281 SetClassRoot(kClassArrayClass, class_array_class.Get()); 282 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 283 SetClassRoot(kCharArrayClass, char_array_class.Get()); 284 SetClassRoot(kJavaLangString, java_lang_String.Get()); 285 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 286 287 // Setup the primitive type classes. 288 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 289 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 290 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 291 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 292 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 293 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 294 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 295 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 296 297 // Create array interface entries to populate once we can load system classes. 298 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 299 300 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 301 Handle<mirror::Class> int_array_class(hs.NewHandle( 302 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 303 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 304 mirror::IntArray::SetArrayClass(int_array_class.Get()); 305 SetClassRoot(kIntArrayClass, int_array_class.Get()); 306 307 // now that these are registered, we can use AllocClass() and AllocObjectArray 308 309 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 310 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 311 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 312 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 313 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 314 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 315 316 // Constructor, Field, Method, and AbstractMethod are necessary so 317 // that FindClass can link members. 318 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 319 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 320 CHECK(java_lang_reflect_ArtField.Get() != NULL); 321 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 322 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 323 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 324 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 325 326 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 327 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 328 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 329 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 330 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 331 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 332 333 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 334 335 // Set up array classes for string, field, method 336 Handle<mirror::Class> object_array_string(hs.NewHandle( 337 AllocClass(self, java_lang_Class.Get(), 338 mirror::ObjectArray<mirror::String>::ClassSize()))); 339 object_array_string->SetComponentType(java_lang_String.Get()); 340 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 341 342 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 343 AllocClass(self, java_lang_Class.Get(), 344 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 345 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 346 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 347 348 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 349 AllocClass(self, java_lang_Class.Get(), 350 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 351 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 352 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 353 354 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 355 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 356 // these roots. 357 CHECK_NE(0U, boot_class_path.size()); 358 for (size_t i = 0; i != boot_class_path.size(); ++i) { 359 const DexFile* dex_file = boot_class_path[i]; 360 CHECK(dex_file != NULL); 361 AppendToBootClassPath(*dex_file); 362 } 363 364 // now we can use FindSystemClass 365 366 // run char class through InitializePrimitiveClass to finish init 367 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 368 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 369 370 // Create runtime resolution and imt conflict methods. Also setup the default imt. 371 Runtime* runtime = Runtime::Current(); 372 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 373 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 374 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 375 376 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 377 // we do not need friend classes or a publicly exposed setter. 378 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 379 if (!runtime->IsCompiler()) { 380 // We need to set up the generic trampolines since we don't have an image. 381 quick_resolution_trampoline_ = reinterpret_cast<void*>(art_quick_resolution_trampoline); 382 quick_imt_conflict_trampoline_ = reinterpret_cast<void*>(art_quick_imt_conflict_trampoline); 383 quick_to_interpreter_bridge_trampoline_ = reinterpret_cast<void*>(art_quick_to_interpreter_bridge); 384 } 385 386 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 387 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 388 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 389 CHECK_EQ(java_lang_Object.Get(), Object_class); 390 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 391 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 392 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 393 std::ostringstream os1, os2; 394 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 395 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 396 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 397 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 398 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 399 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 400 CHECK_EQ(java_lang_String.Get(), String_class); 401 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 402 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 403 404 // Setup the primitive array type classes - can't be done until Object has a vtable. 405 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 406 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 407 408 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 409 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 410 411 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 412 CHECK_EQ(char_array_class.Get(), found_char_array_class); 413 414 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 415 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 416 417 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 418 CHECK_EQ(int_array_class.Get(), found_int_array_class); 419 420 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 421 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 422 423 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 424 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 425 426 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 427 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 428 429 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 430 CHECK_EQ(class_array_class.Get(), found_class_array_class); 431 432 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 433 CHECK_EQ(object_array_class.Get(), found_object_array_class); 434 435 // Setup the single, global copy of "iftable". 436 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 437 CHECK(java_lang_Cloneable != NULL); 438 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 439 CHECK(java_io_Serializable != NULL); 440 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 441 // crawl up and explicitly list all of the supers as well. 442 { 443 mirror::IfTable* array_iftable = array_iftable_.Read(); 444 array_iftable->SetInterface(0, java_lang_Cloneable); 445 array_iftable->SetInterface(1, java_io_Serializable); 446 } 447 448 // Sanity check Class[] and Object[]'s interfaces. 449 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 450 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 451 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 452 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 453 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 454 // dex_cache_ fields and register them in class_table_. 455 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 456 CHECK_EQ(java_lang_Class.Get(), Class_class); 457 458 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 459 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 460 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 461 462 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 463 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 464 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 465 466 mirror::Class* String_array_class = 467 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 468 CHECK_EQ(object_array_string.Get(), String_array_class); 469 470 mirror::Class* Art_method_array_class = 471 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 472 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 473 474 mirror::Class* Art_field_array_class = 475 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 476 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 477 478 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 479 480 // Create java.lang.reflect.Proxy root. 481 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 482 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 483 484 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 485 // finish initializing Reference class 486 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 487 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 488 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 489 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 490 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 491 mirror::Class* java_lang_ref_FinalizerReference = 492 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 493 java_lang_ref_FinalizerReference->SetAccessFlags( 494 java_lang_ref_FinalizerReference->GetAccessFlags() | 495 kAccClassIsReference | kAccClassIsFinalizerReference); 496 mirror::Class* java_lang_ref_PhantomReference = 497 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 498 java_lang_ref_PhantomReference->SetAccessFlags( 499 java_lang_ref_PhantomReference->GetAccessFlags() | 500 kAccClassIsReference | kAccClassIsPhantomReference); 501 mirror::Class* java_lang_ref_SoftReference = 502 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 503 java_lang_ref_SoftReference->SetAccessFlags( 504 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 505 mirror::Class* java_lang_ref_WeakReference = 506 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 507 java_lang_ref_WeakReference->SetAccessFlags( 508 java_lang_ref_WeakReference->GetAccessFlags() | 509 kAccClassIsReference | kAccClassIsWeakReference); 510 511 // Setup the ClassLoader, verifying the object_size_. 512 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 513 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 514 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 515 516 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 517 // java.lang.StackTraceElement as a convenience. 518 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 519 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 520 SetClassRoot(kJavaLangClassNotFoundException, 521 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 522 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 523 SetClassRoot(kJavaLangStackTraceElementArrayClass, 524 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 525 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 526 527 FinishInit(self); 528 529 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 530} 531 532void ClassLinker::FinishInit(Thread* self) { 533 VLOG(startup) << "ClassLinker::FinishInit entering"; 534 535 // Let the heap know some key offsets into java.lang.ref instances 536 // Note: we hard code the field indexes here rather than using FindInstanceField 537 // as the types of the field can't be resolved prior to the runtime being 538 // fully initialized 539 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 540 mirror::Class* java_lang_ref_FinalizerReference = 541 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 542 543 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 544 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 545 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 546 547 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 548 CHECK_STREQ(queue->GetName(), "queue"); 549 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 550 551 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 552 CHECK_STREQ(queueNext->GetName(), "queueNext"); 553 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 554 555 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 556 CHECK_STREQ(referent->GetName(), "referent"); 557 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 558 559 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 560 CHECK_STREQ(zombie->GetName(), "zombie"); 561 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 562 563 // ensure all class_roots_ are initialized 564 for (size_t i = 0; i < kClassRootsMax; i++) { 565 ClassRoot class_root = static_cast<ClassRoot>(i); 566 mirror::Class* klass = GetClassRoot(class_root); 567 CHECK(klass != NULL); 568 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 569 // note SetClassRoot does additional validation. 570 // if possible add new checks there to catch errors early 571 } 572 573 CHECK(!array_iftable_.IsNull()); 574 575 // disable the slow paths in FindClass and CreatePrimitiveClass now 576 // that Object, Class, and Object[] are setup 577 init_done_ = true; 578 579 VLOG(startup) << "ClassLinker::FinishInit exiting"; 580} 581 582void ClassLinker::RunRootClinits() { 583 Thread* self = Thread::Current(); 584 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 585 mirror::Class* c = GetClassRoot(ClassRoot(i)); 586 if (!c->IsArrayClass() && !c->IsPrimitive()) { 587 StackHandleScope<1> hs(self); 588 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 589 EnsureInitialized(h_class, true, true); 590 self->AssertNoPendingException(); 591 } 592 } 593} 594 595bool ClassLinker::GenerateOatFile(const char* dex_filename, 596 int oat_fd, 597 const char* oat_cache_filename, 598 std::string* error_msg) { 599 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 600 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 601 602 gc::Heap* heap = Runtime::Current()->GetHeap(); 603 std::string boot_image_option("--boot-image="); 604 if (heap->GetImageSpace() == nullptr) { 605 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 606 // out of space anyway it might not matter. 607 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 608 "without an image.", dex_filename); 609 return false; 610 } 611 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 612 613 std::string dex_file_option("--dex-file="); 614 dex_file_option += dex_filename; 615 616 std::string oat_fd_option("--oat-fd="); 617 StringAppendF(&oat_fd_option, "%d", oat_fd); 618 619 std::string oat_location_option("--oat-location="); 620 oat_location_option += oat_cache_filename; 621 622 std::vector<std::string> argv; 623 argv.push_back(dex2oat); 624 argv.push_back("--runtime-arg"); 625 argv.push_back("-classpath"); 626 argv.push_back("--runtime-arg"); 627 argv.push_back(Runtime::Current()->GetClassPathString()); 628 629 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 630 631 if (!Runtime::Current()->IsVerificationEnabled()) { 632 argv.push_back("--compiler-filter=verify-none"); 633 } 634 635 if (Runtime::Current()->MustRelocateIfPossible()) { 636 argv.push_back("--runtime-arg"); 637 argv.push_back("-Xrelocate"); 638 } else { 639 argv.push_back("--runtime-arg"); 640 argv.push_back("-Xnorelocate"); 641 } 642 643 if (!kIsTargetBuild) { 644 argv.push_back("--host"); 645 } 646 647 argv.push_back(boot_image_option); 648 argv.push_back(dex_file_option); 649 argv.push_back(oat_fd_option); 650 argv.push_back(oat_location_option); 651 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 652 for (size_t i = 0; i < compiler_options.size(); ++i) { 653 argv.push_back(compiler_options[i].c_str()); 654 } 655 656 return Exec(argv, error_msg); 657} 658 659const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 660 WriterMutexLock mu(Thread::Current(), dex_lock_); 661 if (kIsDebugBuild) { 662 for (size_t i = 0; i < oat_files_.size(); ++i) { 663 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 664 } 665 } 666 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 667 oat_files_.push_back(oat_file); 668 return oat_file; 669} 670 671OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 672 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 673 OatFile* oat_file = space->ReleaseOatFile(); 674 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 675 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 676 return *oat_file; 677} 678 679const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 680 const char* dex_location = dex_file.GetLocation().c_str(); 681 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 682 return FindOpenedOatFile(nullptr, dex_location, &dex_location_checksum); 683} 684 685const OatFile* ClassLinker::FindOpenedOatFile(const char* oat_location, const char* dex_location, 686 const uint32_t* const dex_location_checksum) { 687 ReaderMutexLock mu(Thread::Current(), dex_lock_); 688 for (size_t i = 0; i < oat_files_.size(); i++) { 689 const OatFile* oat_file = oat_files_[i]; 690 DCHECK(oat_file != NULL); 691 692 if (oat_location != nullptr) { 693 if (oat_file->GetLocation() != oat_location) { 694 continue; 695 } 696 } 697 698 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 699 dex_location_checksum, 700 false); 701 if (oat_dex_file != NULL) { 702 return oat_file; 703 } 704 } 705 return NULL; 706} 707 708 709// Loads all multi dex files from the given oat file returning true on success. 710// 711// Parameters: 712// oat_file - the oat file to load from 713// dex_location - the dex location used to generate the oat file 714// dex_location_checksum - the checksum of the dex_location (may be null for pre-opted files) 715// generated - whether or not the oat_file existed before or was just (re)generated 716// error_msgs - any error messages will be appended here 717// dex_files - the loaded dex_files will be appended here (only if the loading succeeds) 718static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, 719 const char* dex_location, 720 const uint32_t* dex_location_checksum, 721 bool generated, 722 std::vector<std::string>* error_msgs, 723 std::vector<const DexFile*>* dex_files) { 724 if (oat_file == nullptr) { 725 return false; 726 } 727 728 size_t old_size = dex_files->size(); // To rollback on error. 729 730 bool success = true; 731 for (size_t i = 0; success; ++i) { 732 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 733 const char* next_name = next_name_str.c_str(); 734 735 uint32_t next_location_checksum; 736 uint32_t* next_location_checksum_pointer = &next_location_checksum; 737 std::string error_msg; 738 if ((i == 0) && (strcmp(next_name, dex_location) == 0)) { 739 // When i=0 the multidex name should be the same as the location name. We already have the 740 // checksum it so we don't need to recompute it. 741 if (dex_location_checksum == nullptr) { 742 next_location_checksum_pointer = nullptr; 743 } else { 744 next_location_checksum = *dex_location_checksum; 745 } 746 } else if (!DexFile::GetChecksum(next_name, next_location_checksum_pointer, &error_msg)) { 747 DCHECK_EQ(false, i == 0 && generated); 748 next_location_checksum_pointer = nullptr; 749 } 750 751 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 752 753 if (oat_dex_file == nullptr) { 754 if (i == 0 && generated) { 755 std::string error_msg; 756 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 757 " file'%s'", dex_location, next_location_checksum, 758 oat_file->GetLocation().c_str()); 759 error_msgs->push_back(error_msg); 760 } 761 break; // Not found, done. 762 } 763 764 // Checksum test. Test must succeed when generated. 765 success = !generated; 766 if (next_location_checksum_pointer != nullptr) { 767 success = next_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 768 } 769 770 if (success) { 771 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 772 if (dex_file == nullptr) { 773 success = false; 774 error_msgs->push_back(error_msg); 775 } else { 776 dex_files->push_back(dex_file); 777 } 778 } 779 780 // When we generated the file, we expect success, or something is terribly wrong. 781 CHECK_EQ(false, generated && !success) 782 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 783 << std::hex << " dex_location_checksum=" << next_location_checksum 784 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 785 } 786 787 if (dex_files->size() == old_size) { 788 success = false; // We did not even find classes.dex 789 } 790 791 if (success) { 792 return true; 793 } else { 794 // Free all the dex files we have loaded. 795 auto it = dex_files->begin() + old_size; 796 auto it_end = dex_files->end(); 797 for (; it != it_end; it++) { 798 delete *it; 799 } 800 dex_files->erase(dex_files->begin() + old_size, it_end); 801 802 return false; 803 } 804} 805 806// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 807// complicates the loading process, as we should not use an iterative loading process, because that 808// would register the oat file and dex files that come before the broken one. Instead, check all 809// multidex ahead of time. 810bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 811 std::vector<std::string>* error_msgs, 812 std::vector<const DexFile*>* dex_files) { 813 // 1) Check whether we have an open oat file. 814 // This requires a dex checksum, use the "primary" one. 815 uint32_t dex_location_checksum; 816 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 817 bool have_checksum = true; 818 std::string checksum_error_msg; 819 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 820 // This happens for pre-opted files since the corresponding dex files are no longer on disk. 821 dex_location_checksum_pointer = nullptr; 822 have_checksum = false; 823 } 824 825 bool needs_registering = false; 826 827 std::unique_ptr<const OatFile> open_oat_file(FindOpenedOatFile(oat_location, dex_location, 828 dex_location_checksum_pointer)); 829 830 // 2) If we do not have an open one, maybe there's one on disk already. 831 832 // In case the oat file is not open, we play a locking game here so 833 // that if two different processes race to load and register or generate 834 // (or worse, one tries to open a partial generated file) we will be okay. 835 // This is actually common with apps that use DexClassLoader to work 836 // around the dex method reference limit and that have a background 837 // service running in a separate process. 838 ScopedFlock scoped_flock; 839 840 if (open_oat_file.get() == nullptr) { 841 if (oat_location != nullptr) { 842 // Can only do this if we have a checksum, else error. 843 if (!have_checksum) { 844 error_msgs->push_back(checksum_error_msg); 845 return false; 846 } 847 848 std::string error_msg; 849 850 // We are loading or creating one in the future. Time to set up the file lock. 851 if (!scoped_flock.Init(oat_location, &error_msg)) { 852 error_msgs->push_back(error_msg); 853 return false; 854 } 855 856 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 857 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 858 oat_location, &error_msg)); 859 860 if (open_oat_file.get() == nullptr) { 861 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 862 dex_location, oat_location, error_msg.c_str()); 863 VLOG(class_linker) << compound_msg; 864 error_msgs->push_back(compound_msg); 865 } 866 } else { 867 // TODO: What to lock here? 868 bool obsolete_file_cleanup_failed; 869 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 870 dex_location_checksum_pointer, 871 kRuntimeISA, error_msgs, 872 &obsolete_file_cleanup_failed)); 873 // There's no point in going forward and eventually try to regenerate the 874 // file if we couldn't remove the obsolete one. Mostly likely we will fail 875 // with the same error when trying to write the new file. 876 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 877 if (obsolete_file_cleanup_failed) { 878 return false; 879 } 880 } 881 needs_registering = true; 882 } 883 884 // 3) If we have an oat file, check all contained multidex files for our dex_location. 885 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 886 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 887 dex_location_checksum_pointer, 888 false, error_msgs, dex_files); 889 if (success) { 890 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 891 if (needs_registering) { 892 // We opened the oat file, so we must register it. 893 RegisterOatFile(oat_file); 894 } 895 // If the file isn't executable we failed patchoat but did manage to get the dex files. 896 return oat_file->IsExecutable(); 897 } else { 898 if (needs_registering) { 899 // We opened it, delete it. 900 open_oat_file.reset(); 901 } else { 902 open_oat_file.release(); // Do not delete open oat files. 903 } 904 } 905 906 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 907 908 // Need a checksum, fail else. 909 if (!have_checksum) { 910 error_msgs->push_back(checksum_error_msg); 911 return false; 912 } 913 914 // Look in cache location if no oat_location is given. 915 std::string cache_location; 916 if (oat_location == nullptr) { 917 // Use the dalvik cache. 918 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 919 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 920 oat_location = cache_location.c_str(); 921 } 922 923 bool has_flock = true; 924 // Definitely need to lock now. 925 if (!scoped_flock.HasFile()) { 926 std::string error_msg; 927 if (!scoped_flock.Init(oat_location, &error_msg)) { 928 error_msgs->push_back(error_msg); 929 has_flock = false; 930 } 931 } 932 933 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 934 // Create the oat file. 935 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 936 oat_location, error_msgs)); 937 } 938 939 // Failed, bail. 940 if (open_oat_file.get() == nullptr) { 941 std::string error_msg; 942 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 943 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 944 error_msgs->push_back(error_msg); 945 return false; 946 } 947 948 // Try to load again, but stronger checks. 949 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, dex_location_checksum_pointer, 950 true, error_msgs, dex_files); 951 if (success) { 952 RegisterOatFile(open_oat_file.release()); 953 return true; 954 } else { 955 return false; 956 } 957} 958 959const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 960 uint32_t dex_location_checksum, 961 const char* oat_location, 962 std::string* error_msg) { 963 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 964 !Runtime::Current()->IsCompiler(), 965 error_msg)); 966 if (oat_file.get() == nullptr) { 967 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 968 error_msg->c_str()); 969 return nullptr; 970 } 971 Runtime* runtime = Runtime::Current(); 972 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 973 if (image_space != nullptr) { 974 const ImageHeader& image_header = image_space->GetImageHeader(); 975 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 976 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 977 if (expected_image_oat_checksum != actual_image_oat_checksum) { 978 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 979 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 980 actual_image_oat_checksum); 981 return nullptr; 982 } 983 984 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 985 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 986 if (expected_image_oat_offset != actual_image_oat_offset) { 987 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 988 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 989 actual_image_oat_offset); 990 return nullptr; 991 } 992 int32_t expected_patch_delta = image_header.GetPatchDelta(); 993 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 994 if (expected_patch_delta != actual_patch_delta) { 995 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 996 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 997 return nullptr; 998 } 999 } 1000 1001 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1002 &dex_location_checksum); 1003 if (oat_dex_file == nullptr) { 1004 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 1005 dex_location); 1006 return nullptr; 1007 } 1008 uint32_t expected_dex_checksum = dex_location_checksum; 1009 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 1010 if (expected_dex_checksum != actual_dex_checksum) { 1011 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 1012 "found 0x%x", oat_location, expected_dex_checksum, 1013 actual_dex_checksum); 1014 return nullptr; 1015 } 1016 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 1017 if (dex_file.get() != nullptr) { 1018 return oat_file.release(); 1019 } else { 1020 return nullptr; 1021 } 1022} 1023 1024const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1025 int fd, const char* oat_location, 1026 std::vector<std::string>* error_msgs) { 1027 // Generate the output oat file for the dex file 1028 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1029 std::string error_msg; 1030 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1031 CHECK(!error_msg.empty()); 1032 error_msgs->push_back(error_msg); 1033 return nullptr; 1034 } 1035 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 1036 !Runtime::Current()->IsCompiler(), 1037 &error_msg)); 1038 if (oat_file.get() == nullptr) { 1039 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1040 oat_location, error_msg.c_str()); 1041 error_msgs->push_back(compound_msg); 1042 return nullptr; 1043 } 1044 1045 return oat_file.release(); 1046} 1047 1048bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1049 const InstructionSet instruction_set) { 1050 Runtime* runtime = Runtime::Current(); 1051 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1052 if (image_space == nullptr) { 1053 return false; 1054 } 1055 uint32_t image_oat_checksum = 0; 1056 if (instruction_set == kRuntimeISA) { 1057 const ImageHeader& image_header = image_space->GetImageHeader(); 1058 image_oat_checksum = image_header.GetOatChecksum(); 1059 } else { 1060 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1061 image_space->GetImageLocation().c_str(), instruction_set)); 1062 image_oat_checksum = image_header->GetOatChecksum(); 1063 } 1064 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1065} 1066 1067bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1068 const InstructionSet instruction_set, 1069 std::string* error_msg) { 1070 Runtime* runtime = Runtime::Current(); 1071 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1072 if (image_space == nullptr) { 1073 *error_msg = "No image space for verification against"; 1074 return false; 1075 } 1076 1077 // If the requested instruction set is the same as the current runtime, 1078 // we can use the checksums directly. If it isn't, we'll have to read the 1079 // image header from the image for the right instruction set. 1080 uint32_t image_oat_checksum = 0; 1081 uintptr_t image_oat_data_begin = 0; 1082 int32_t image_patch_delta = 0; 1083 if (instruction_set == Runtime::Current()->GetInstructionSet()) { 1084 const ImageHeader& image_header = image_space->GetImageHeader(); 1085 image_oat_checksum = image_header.GetOatChecksum(); 1086 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1087 image_patch_delta = image_header.GetPatchDelta(); 1088 } else { 1089 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1090 image_space->GetImageLocation().c_str(), instruction_set)); 1091 image_oat_checksum = image_header->GetOatChecksum(); 1092 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1093 image_patch_delta = image_header->GetPatchDelta(); 1094 } 1095 const OatHeader& oat_header = oat_file->GetOatHeader(); 1096 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1097 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1098 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1099 if (!ret) { 1100 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1101 oat_file->GetLocation().c_str(), 1102 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1103 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1104 oat_file->GetOatHeader().GetImagePatchDelta(), 1105 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1106 } 1107 return ret; 1108} 1109 1110bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1111 const char* dex_location, 1112 uint32_t dex_location_checksum, 1113 const InstructionSet instruction_set, 1114 std::string* error_msg) { 1115 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1116 return false; 1117 } 1118 1119 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1120 &dex_location_checksum); 1121 if (oat_dex_file == NULL) { 1122 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1123 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1124 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 1125 for (size_t i = 0; i < oat_dex_files.size(); i++) { 1126 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 1127 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 1128 oat_file->GetLocation().c_str(), 1129 oat_dex_file->GetDexFileLocation().c_str()); 1130 } 1131 return false; 1132 } 1133 1134 if (dex_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) { 1135 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1136 oat_file->GetLocation().c_str(), 1137 oat_dex_file->GetDexFileLocationChecksum(), 1138 dex_location, dex_location_checksum); 1139 return false; 1140 } 1141 return true; 1142} 1143 1144bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1145 const char* dex_location, 1146 const uint32_t* dex_location_checksum, 1147 std::string* error_msg) { 1148 CHECK(oat_file != nullptr); 1149 CHECK(dex_location != nullptr); 1150 std::unique_ptr<const DexFile> dex_file; 1151 if (dex_location_checksum == nullptr) { 1152 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1153 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1154 // directory. 1155 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1156 if (oat_dex_file == nullptr) { 1157 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1158 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1159 error_msg->c_str()); 1160 return false; 1161 } 1162 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1163 } else { 1164 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, *dex_location_checksum, 1165 kRuntimeISA, error_msg); 1166 if (!verified) { 1167 return false; 1168 } 1169 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1170 dex_location_checksum)->OpenDexFile(error_msg)); 1171 } 1172 return dex_file.get() != nullptr; 1173} 1174 1175const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1176 const char* dex_location, 1177 const uint32_t* const dex_location_checksum, 1178 InstructionSet isa, 1179 std::vector<std::string>* error_msgs, 1180 bool* obsolete_file_cleanup_failed) { 1181 *obsolete_file_cleanup_failed = false; 1182 bool already_opened = false; 1183 std::string dex_location_str(dex_location); 1184 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1185 &already_opened, 1186 obsolete_file_cleanup_failed, 1187 error_msgs)); 1188 std::string error_msg; 1189 if (oat_file.get() == nullptr) { 1190 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1191 dex_location)); 1192 return nullptr; 1193 } else if (oat_file->IsExecutable() && 1194 !VerifyOatWithDexFile(oat_file.get(), dex_location, 1195 dex_location_checksum, &error_msg)) { 1196 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1197 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1198 error_msg.c_str())); 1199 return nullptr; 1200 } else if (!oat_file->IsExecutable() && 1201 Runtime::Current()->GetHeap()->HasImageSpace() && 1202 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1203 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1204 "dex location '%s'. Image checksum incorrect.", 1205 oat_file->GetLocation().c_str(), dex_location)); 1206 return nullptr; 1207 } else { 1208 return oat_file.release(); 1209 } 1210} 1211 1212const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1213 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1214 for (size_t i = 0; i < oat_files_.size(); i++) { 1215 const OatFile* oat_file = oat_files_[i]; 1216 DCHECK(oat_file != nullptr); 1217 if (oat_file->GetLocation() == oat_location) { 1218 return oat_file; 1219 } 1220 } 1221 return nullptr; 1222} 1223 1224const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1225 InstructionSet isa, 1226 bool *already_opened, 1227 bool *obsolete_file_cleanup_failed, 1228 std::vector<std::string>* error_msgs) { 1229 // Find out if we've already opened the file 1230 const OatFile* ret = nullptr; 1231 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1232 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1233 if (ret != nullptr) { 1234 *already_opened = true; 1235 return ret; 1236 } 1237 1238 std::string dalvik_cache; 1239 bool have_android_data = false; 1240 bool have_dalvik_cache = false; 1241 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1242 &have_android_data, &have_dalvik_cache); 1243 std::string cache_filename; 1244 if (have_dalvik_cache) { 1245 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1246 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1247 if (ret != nullptr) { 1248 *already_opened = true; 1249 return ret; 1250 } 1251 } else { 1252 // If we need to relocate we should just place odex back where it started. 1253 cache_filename = odex_filename; 1254 } 1255 1256 ret = nullptr; 1257 1258 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1259 // 1260 // Now we do the following: 1261 // 1) Try and open the odex version 1262 // 2) If present, checksum-verified & relocated correctly return it 1263 // 3) Close the odex version to free up its address space. 1264 // 4) Try and open the cache version 1265 // 5) If present, checksum-verified & relocated correctly return it 1266 // 6) Close the cache version to free up its address space. 1267 // 7) If we should relocate: 1268 // a) If we have opened and checksum-verified the odex version relocate it to 1269 // 'cache_filename' and return it 1270 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1271 // it. This should not happen often (I think only the run-test's will hit this case). 1272 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1273 // this point. 1274 // 9) Return nullptr 1275 1276 *already_opened = false; 1277 const Runtime* runtime = Runtime::Current(); 1278 CHECK(runtime != nullptr); 1279 bool executable = !runtime->IsCompiler(); 1280 1281 std::string odex_error_msg; 1282 bool should_patch_system = false; 1283 bool odex_checksum_verified = false; 1284 bool have_system_odex = false; 1285 { 1286 // There is a high probability that these both these oat files map similar/the same address 1287 // spaces so we must scope them like this so they each gets its turn. 1288 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, NULL, 1289 executable, &odex_error_msg)); 1290 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1291 &odex_checksum_verified, 1292 &odex_error_msg)) { 1293 error_msgs->push_back(odex_error_msg); 1294 return odex_oat_file.release(); 1295 } else { 1296 if (odex_checksum_verified) { 1297 // We can just relocate 1298 should_patch_system = true; 1299 odex_error_msg = "Image Patches are incorrect"; 1300 } 1301 if (odex_oat_file.get() != nullptr) { 1302 have_system_odex = true; 1303 } 1304 } 1305 } 1306 1307 std::string cache_error_msg; 1308 bool should_patch_cache = false; 1309 bool cache_checksum_verified = false; 1310 if (have_dalvik_cache) { 1311 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, NULL, 1312 executable, &cache_error_msg)); 1313 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1314 &cache_checksum_verified, 1315 &cache_error_msg)) { 1316 error_msgs->push_back(cache_error_msg); 1317 return cache_oat_file.release(); 1318 } else if (cache_checksum_verified) { 1319 // We can just relocate 1320 should_patch_cache = true; 1321 cache_error_msg = "Image Patches are incorrect"; 1322 } 1323 } else if (have_android_data) { 1324 // dalvik_cache does not exist but android data does. This means we should be able to create 1325 // it, so we should try. 1326 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1327 } 1328 1329 ret = nullptr; 1330 std::string error_msg; 1331 if (runtime->CanRelocate()) { 1332 // Run relocation 1333 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1334 if (space != nullptr) { 1335 const std::string& image_location = space->GetImageLocation(); 1336 if (odex_checksum_verified && should_patch_system) { 1337 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1338 } else if (cache_checksum_verified && should_patch_cache) { 1339 CHECK(have_dalvik_cache); 1340 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1341 } 1342 } else if (have_system_odex) { 1343 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1344 } 1345 } 1346 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1347 // implicitly: were able to fine where the cached version is but we were unable to use it, 1348 // either as a destination for relocation or to open a file. We should delete it if it is 1349 // there. 1350 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1351 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1352 "searching for dex file %s: %s", 1353 cache_filename.c_str(), dex_location.c_str(), 1354 strerror(errno)); 1355 error_msgs->push_back(rm_error_msg); 1356 VLOG(class_linker) << rm_error_msg; 1357 // Let the caller know that we couldn't remove the obsolete file. 1358 // This is a good indication that further writes may fail as well. 1359 *obsolete_file_cleanup_failed = true; 1360 } 1361 } 1362 if (ret == nullptr) { 1363 VLOG(class_linker) << error_msg; 1364 error_msgs->push_back(error_msg); 1365 std::string relocation_msg; 1366 if (runtime->CanRelocate()) { 1367 relocation_msg = StringPrintf(" and relocation failed"); 1368 } 1369 if (have_dalvik_cache && cache_checksum_verified) { 1370 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1371 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1372 cache_filename.c_str(), cache_error_msg.c_str(), 1373 relocation_msg.c_str()); 1374 } else { 1375 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1376 "dalvik_cache availible)%s.", odex_filename.c_str(), 1377 odex_error_msg.c_str(), relocation_msg.c_str()); 1378 } 1379 VLOG(class_linker) << error_msg; 1380 error_msgs->push_back(error_msg); 1381 } 1382 return ret; 1383} 1384 1385const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1386 InstructionSet isa, 1387 std::string* error_msg) { 1388 // We open it non-executable 1389 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, NULL, false, error_msg)); 1390 if (output.get() == nullptr) { 1391 return nullptr; 1392 } 1393 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1394 VerifyOatImageChecksum(output.get(), isa)) { 1395 return output.release(); 1396 } else { 1397 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1398 oat_path.c_str()); 1399 return nullptr; 1400 } 1401} 1402 1403const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1404 const std::string& output_oat, 1405 const std::string& image_location, 1406 InstructionSet isa, 1407 std::string* error_msg) { 1408 if (!Runtime::Current()->GetHeap()->HasImageSpace()) { 1409 // We don't have an image space so there is no point in trying to patchoat. 1410 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1411 << "running without an image. Attempting to use oat file for interpretation."; 1412 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1413 } 1414 if (!Runtime::Current()->IsDex2OatEnabled()) { 1415 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1416 // input_oat but make sure we only do interpretation on it's dex files. 1417 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1418 << "disabled. Attempting to use oat file for interpretation"; 1419 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1420 } 1421 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1422 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1423 1424 std::string isa_arg("--instruction-set="); 1425 isa_arg += GetInstructionSetString(isa); 1426 std::string input_oat_filename_arg("--input-oat-file="); 1427 input_oat_filename_arg += input_oat; 1428 std::string output_oat_filename_arg("--output-oat-file="); 1429 output_oat_filename_arg += output_oat; 1430 std::string patched_image_arg("--patched-image-location="); 1431 patched_image_arg += image_location; 1432 1433 std::vector<std::string> argv; 1434 argv.push_back(patchoat); 1435 argv.push_back(isa_arg); 1436 argv.push_back(input_oat_filename_arg); 1437 argv.push_back(output_oat_filename_arg); 1438 argv.push_back(patched_image_arg); 1439 1440 std::string command_line(Join(argv, ' ')); 1441 LOG(INFO) << "Relocate Oat File: " << command_line; 1442 bool success = Exec(argv, error_msg); 1443 if (success) { 1444 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, NULL, 1445 !Runtime::Current()->IsCompiler(), error_msg)); 1446 bool checksum_verified = false; 1447 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1448 return output.release(); 1449 } else if (output.get() != nullptr) { 1450 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1451 "but output file '%s' failed verifcation: %s", 1452 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1453 } else { 1454 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1455 "but was unable to open output file '%s': %s", 1456 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1457 } 1458 } else if (!Runtime::Current()->IsCompiler()) { 1459 // patchoat failed which means we probably don't have enough room to place the output oat file, 1460 // instead of failing we should just run the interpreter from the dex files in the input oat. 1461 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1462 << "for interpretation. patchoat failure was: " << *error_msg; 1463 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1464 } else { 1465 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1466 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1467 error_msg->c_str()); 1468 } 1469 return nullptr; 1470} 1471 1472int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1473 Runtime* runtime = Runtime::Current(); 1474 int32_t real_patch_delta; 1475 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1476 CHECK(image_space != nullptr); 1477 if (isa == Runtime::Current()->GetInstructionSet()) { 1478 const ImageHeader& image_header = image_space->GetImageHeader(); 1479 real_patch_delta = image_header.GetPatchDelta(); 1480 } else { 1481 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1482 image_space->GetImageLocation().c_str(), isa)); 1483 real_patch_delta = image_header->GetPatchDelta(); 1484 } 1485 const OatHeader& oat_header = oat_file->GetOatHeader(); 1486 return real_patch_delta - oat_header.GetImagePatchDelta(); 1487} 1488 1489bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1490 bool* checksum_verified, 1491 std::string* error_msg) { 1492 std::string compound_msg("Oat file failed to verify: "); 1493 Runtime* runtime = Runtime::Current(); 1494 uint32_t real_image_checksum; 1495 void* real_image_oat_offset; 1496 int32_t real_patch_delta; 1497 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1498 if (image_space == nullptr) { 1499 *error_msg = "No image space present"; 1500 return false; 1501 } 1502 if (isa == Runtime::Current()->GetInstructionSet()) { 1503 const ImageHeader& image_header = image_space->GetImageHeader(); 1504 real_image_checksum = image_header.GetOatChecksum(); 1505 real_image_oat_offset = image_header.GetOatDataBegin(); 1506 real_patch_delta = image_header.GetPatchDelta(); 1507 } else { 1508 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1509 image_space->GetImageLocation().c_str(), isa)); 1510 real_image_checksum = image_header->GetOatChecksum(); 1511 real_image_oat_offset = image_header->GetOatDataBegin(); 1512 real_patch_delta = image_header->GetPatchDelta(); 1513 } 1514 1515 const OatHeader& oat_header = oat_file->GetOatHeader(); 1516 1517 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1518 *checksum_verified = oat_image_checksum == real_image_checksum; 1519 if (!*checksum_verified) { 1520 compound_msg += StringPrintf(" Oat Image Checksum Incorrect (expected 0x%x, recieved 0x%x)", 1521 real_image_checksum, oat_image_checksum); 1522 } 1523 1524 void* oat_image_oat_offset = 1525 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1526 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1527 if (!offset_verified) { 1528 compound_msg += StringPrintf(" Oat Image oat offset incorrect (expected 0x%p, recieved 0x%p)", 1529 real_image_oat_offset, oat_image_oat_offset); 1530 } 1531 1532 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1533 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1534 if (!patch_delta_verified) { 1535 compound_msg += StringPrintf(" Oat image patch delta incorrect (expected 0x%x, recieved 0x%x)", 1536 real_patch_delta, oat_patch_delta); 1537 } 1538 1539 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1540 if (ret) { 1541 *error_msg = compound_msg; 1542 } 1543 return ret; 1544} 1545 1546const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1547 std::string* error_msg) { 1548 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1549 if (oat_file != nullptr) { 1550 return oat_file; 1551 } 1552 1553 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1554 error_msg); 1555 if (oat_file == NULL) { 1556 return NULL; 1557 } 1558 return oat_file; 1559} 1560 1561static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1562 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1563 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1564 1565 DCHECK(obj != NULL); 1566 DCHECK(class_linker != NULL); 1567 1568 if (obj->IsArtMethod()) { 1569 mirror::ArtMethod* method = obj->AsArtMethod(); 1570 if (!method->IsNative()) { 1571 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1572 if (method != Runtime::Current()->GetResolutionMethod()) { 1573 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1574 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1575 } 1576 } 1577 } 1578} 1579 1580void ClassLinker::InitFromImage() { 1581 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1582 CHECK(!init_done_); 1583 1584 Thread* self = Thread::Current(); 1585 gc::Heap* heap = Runtime::Current()->GetHeap(); 1586 gc::space::ImageSpace* space = heap->GetImageSpace(); 1587 dex_cache_image_class_lookup_required_ = true; 1588 CHECK(space != NULL); 1589 OatFile& oat_file = GetImageOatFile(space); 1590 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1591 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1592 const char* image_file_location = oat_file.GetOatHeader(). 1593 GetStoreValueByKey(OatHeader::kImageLocationKey); 1594 CHECK(image_file_location == nullptr || *image_file_location == 0); 1595 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1596 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1597 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1598 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1599 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1600 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1601 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1602 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1603 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1604 1605 StackHandleScope<1> hs(self); 1606 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1607 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1608 AsObjectArray<mirror::Class>())); 1609 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1610 1611 // Special case of setting up the String class early so that we can test arbitrary objects 1612 // as being Strings or not 1613 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1614 1615 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1616 static_cast<uint32_t>(dex_caches->GetLength())); 1617 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1618 StackHandleScope<1> hs(self); 1619 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1620 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1621 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1622 nullptr); 1623 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1624 std::string error_msg; 1625 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1626 if (dex_file == NULL) { 1627 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1628 << " from within oat file " << oat_file.GetLocation() 1629 << " error '" << error_msg << "'"; 1630 } 1631 1632 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1633 1634 AppendToBootClassPath(*dex_file, dex_cache); 1635 } 1636 1637 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1638 // bitmap walk. 1639 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1640 1641 // Set entry point to interpreter if in InterpretOnly mode. 1642 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1643 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1644 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1645 } 1646 1647 // reinit class_roots_ 1648 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1649 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1650 1651 // reinit array_iftable_ from any array class instance, they should be == 1652 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1653 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1654 // String class root was set above 1655 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1656 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1657 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1658 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1659 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1660 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1661 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1662 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1663 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1664 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1665 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1666 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1667 1668 FinishInit(self); 1669 1670 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1671} 1672 1673void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1674 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1675 if ((flags & kVisitRootFlagAllRoots) != 0) { 1676 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1677 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1678 } 1679 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1680 for (auto& pair : new_class_roots_) { 1681 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1682 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1683 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1684 if (UNLIKELY(new_ref != old_ref)) { 1685 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1686 // corresponding object. This is slow, but luckily for us, this may only happen with a 1687 // concurrent moving GC. 1688 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1689 it != end && it->first == pair.first; ++it) { 1690 // If the class stored matches the old class, update it to the new value. 1691 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1692 it->second = GcRoot<mirror::Class>(new_ref); 1693 } 1694 } 1695 } 1696 } 1697 } 1698 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1699 new_class_roots_.clear(); 1700 } 1701 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1702 log_new_class_table_roots_ = true; 1703 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1704 log_new_class_table_roots_ = false; 1705 } 1706 // We deliberately ignore the class roots in the image since we 1707 // handle image roots by using the MS/CMS rescanning of dirty cards. 1708} 1709 1710// Keep in sync with InitCallback. Anything we visit, we need to 1711// reinit references to when reinitializing a ClassLinker from a 1712// mapped image. 1713void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1714 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1715 Thread* self = Thread::Current(); 1716 { 1717 ReaderMutexLock mu(self, dex_lock_); 1718 if ((flags & kVisitRootFlagAllRoots) != 0) { 1719 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1720 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1721 } 1722 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1723 for (size_t index : new_dex_cache_roots_) { 1724 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1725 } 1726 } 1727 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1728 new_dex_cache_roots_.clear(); 1729 } 1730 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1731 log_new_dex_caches_roots_ = true; 1732 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1733 log_new_dex_caches_roots_ = false; 1734 } 1735 } 1736 VisitClassRoots(callback, arg, flags); 1737 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1738 DCHECK(!array_iftable_.IsNull()); 1739 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1740 if (!find_array_class_cache_[i].IsNull()) { 1741 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1742 } 1743 } 1744} 1745 1746void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1747 if (dex_cache_image_class_lookup_required_) { 1748 MoveImageClassesToClassTable(); 1749 } 1750 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1751 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1752 mirror::Class* c = it.second.Read(); 1753 if (!visitor(c, arg)) { 1754 return; 1755 } 1756 } 1757} 1758 1759static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1760 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1761 classes->insert(c); 1762 return true; 1763} 1764 1765void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1766 std::set<mirror::Class*> classes; 1767 VisitClasses(GetClassesVisitor, &classes); 1768 for (mirror::Class* klass : classes) { 1769 if (!visitor(klass, arg)) { 1770 return; 1771 } 1772 } 1773} 1774 1775ClassLinker::~ClassLinker() { 1776 mirror::Class::ResetClass(); 1777 mirror::String::ResetClass(); 1778 mirror::Reference::ResetClass(); 1779 mirror::ArtField::ResetClass(); 1780 mirror::ArtMethod::ResetClass(); 1781 mirror::BooleanArray::ResetArrayClass(); 1782 mirror::ByteArray::ResetArrayClass(); 1783 mirror::CharArray::ResetArrayClass(); 1784 mirror::DoubleArray::ResetArrayClass(); 1785 mirror::FloatArray::ResetArrayClass(); 1786 mirror::IntArray::ResetArrayClass(); 1787 mirror::LongArray::ResetArrayClass(); 1788 mirror::ShortArray::ResetArrayClass(); 1789 mirror::Throwable::ResetClass(); 1790 mirror::StackTraceElement::ResetClass(); 1791 STLDeleteElements(&boot_class_path_); 1792 STLDeleteElements(&oat_files_); 1793} 1794 1795mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1796 gc::Heap* heap = Runtime::Current()->GetHeap(); 1797 StackHandleScope<16> hs(self); 1798 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1799 Handle<mirror::DexCache> dex_cache( 1800 hs.NewHandle(down_cast<mirror::DexCache*>( 1801 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1802 VoidFunctor())))); 1803 if (dex_cache.Get() == NULL) { 1804 return NULL; 1805 } 1806 Handle<mirror::String> 1807 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1808 if (location.Get() == NULL) { 1809 return NULL; 1810 } 1811 Handle<mirror::ObjectArray<mirror::String>> 1812 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1813 if (strings.Get() == NULL) { 1814 return NULL; 1815 } 1816 Handle<mirror::ObjectArray<mirror::Class>> 1817 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1818 if (types.Get() == NULL) { 1819 return NULL; 1820 } 1821 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1822 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1823 if (methods.Get() == NULL) { 1824 return NULL; 1825 } 1826 Handle<mirror::ObjectArray<mirror::ArtField>> 1827 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1828 if (fields.Get() == NULL) { 1829 return NULL; 1830 } 1831 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1832 fields.Get()); 1833 return dex_cache.Get(); 1834} 1835 1836mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1837 uint32_t class_size) { 1838 DCHECK_GE(class_size, sizeof(mirror::Class)); 1839 gc::Heap* heap = Runtime::Current()->GetHeap(); 1840 mirror::Class::InitializeClassVisitor visitor(class_size); 1841 mirror::Object* k = kMovingClasses ? 1842 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1843 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1844 if (UNLIKELY(k == nullptr)) { 1845 CHECK(self->IsExceptionPending()); // OOME. 1846 return nullptr; 1847 } 1848 return k->AsClass(); 1849} 1850 1851mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1852 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1853} 1854 1855mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1856 return down_cast<mirror::ArtField*>( 1857 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1858} 1859 1860mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1861 return down_cast<mirror::ArtMethod*>( 1862 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1863} 1864 1865mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1866 Thread* self, size_t length) { 1867 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1868 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1869} 1870 1871mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1872 mirror::Class* klass) { 1873 DCHECK(klass != NULL); 1874 1875 // For temporary classes we must wait for them to be retired. 1876 if (init_done_ && klass->IsTemp()) { 1877 CHECK(!klass->IsResolved()); 1878 if (klass->IsErroneous()) { 1879 ThrowEarlierClassFailure(klass); 1880 return nullptr; 1881 } 1882 StackHandleScope<1> hs(self); 1883 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1884 ObjectLock<mirror::Class> lock(self, h_class); 1885 // Loop and wait for the resolving thread to retire this class. 1886 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1887 lock.WaitIgnoringInterrupts(); 1888 } 1889 if (h_class->IsErroneous()) { 1890 ThrowEarlierClassFailure(h_class.Get()); 1891 return nullptr; 1892 } 1893 CHECK(h_class->IsRetired()); 1894 // Get the updated class from class table. 1895 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1896 } 1897 1898 // Wait for the class if it has not already been linked. 1899 if (!klass->IsResolved() && !klass->IsErroneous()) { 1900 StackHandleScope<1> hs(self); 1901 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1902 ObjectLock<mirror::Class> lock(self, h_class); 1903 // Check for circular dependencies between classes. 1904 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1905 ThrowClassCircularityError(h_class.Get()); 1906 h_class->SetStatus(mirror::Class::kStatusError, self); 1907 return nullptr; 1908 } 1909 // Wait for the pending initialization to complete. 1910 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1911 lock.WaitIgnoringInterrupts(); 1912 } 1913 } 1914 1915 if (klass->IsErroneous()) { 1916 ThrowEarlierClassFailure(klass); 1917 return nullptr; 1918 } 1919 // Return the loaded class. No exceptions should be pending. 1920 CHECK(klass->IsResolved()) << PrettyClass(klass); 1921 self->AssertNoPendingException(); 1922 return klass; 1923} 1924 1925mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1926 Handle<mirror::ClassLoader> class_loader) { 1927 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1928 DCHECK(self != nullptr); 1929 self->AssertNoPendingException(); 1930 if (descriptor[1] == '\0') { 1931 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1932 // for primitive classes that aren't backed by dex files. 1933 return FindPrimitiveClass(descriptor[0]); 1934 } 1935 // Find the class in the loaded classes table. 1936 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1937 if (klass != NULL) { 1938 return EnsureResolved(self, descriptor, klass); 1939 } 1940 // Class is not yet loaded. 1941 if (descriptor[0] == '[') { 1942 return CreateArrayClass(self, descriptor, class_loader); 1943 } else if (class_loader.Get() == nullptr) { 1944 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1945 if (pair.second != NULL) { 1946 StackHandleScope<1> hs(self); 1947 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1948 } 1949 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1950 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1951 // throw of a NoClassDefFoundError. 1952 if (IsInBootClassPath(descriptor)) { 1953 mirror::Class* system_class = FindSystemClass(self, descriptor); 1954 CHECK(system_class != NULL); 1955 return system_class; 1956 } 1957 // Next try the compile time class path. 1958 const std::vector<const DexFile*>* class_path; 1959 { 1960 ScopedObjectAccessUnchecked soa(self); 1961 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1962 soa.AddLocalReference<jobject>(class_loader.Get())); 1963 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1964 } 1965 1966 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1967 if (pair.second != NULL) { 1968 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1969 } 1970 1971 } else { 1972 ScopedObjectAccessUnchecked soa(self); 1973 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1974 soa.AddLocalReference<jobject>(class_loader.Get())); 1975 std::string class_name_string(DescriptorToDot(descriptor)); 1976 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1977 { 1978 ScopedThreadStateChange tsc(self, kNative); 1979 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1980 soa.Env()->NewStringUTF(class_name_string.c_str())); 1981 if (class_name_object.get() == NULL) { 1982 return NULL; 1983 } 1984 CHECK(class_loader_object.get() != NULL); 1985 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1986 WellKnownClasses::java_lang_ClassLoader_loadClass, 1987 class_name_object.get())); 1988 } 1989 if (self->IsExceptionPending()) { 1990 // If the ClassLoader threw, pass that exception up. 1991 return NULL; 1992 } else if (result.get() == NULL) { 1993 // broken loader - throw NPE to be compatible with Dalvik 1994 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1995 class_name_string.c_str()).c_str()); 1996 return NULL; 1997 } else { 1998 // success, return mirror::Class* 1999 return soa.Decode<mirror::Class*>(result.get()); 2000 } 2001 } 2002 2003 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 2004 return NULL; 2005} 2006 2007mirror::Class* ClassLinker::DefineClass(const char* descriptor, 2008 Handle<mirror::ClassLoader> class_loader, 2009 const DexFile& dex_file, 2010 const DexFile::ClassDef& dex_class_def) { 2011 Thread* self = Thread::Current(); 2012 StackHandleScope<3> hs(self); 2013 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2014 bool should_allocate = false; 2015 2016 // Load the class from the dex file. 2017 if (UNLIKELY(!init_done_)) { 2018 // finish up init of hand crafted class_roots_ 2019 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2020 klass.Assign(GetClassRoot(kJavaLangObject)); 2021 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2022 klass.Assign(GetClassRoot(kJavaLangClass)); 2023 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2024 klass.Assign(GetClassRoot(kJavaLangString)); 2025 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2026 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2027 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2028 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2029 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2030 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2031 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2032 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2033 } else { 2034 should_allocate = true; 2035 } 2036 } else { 2037 should_allocate = true; 2038 } 2039 2040 if (should_allocate) { 2041 // Allocate a class with the status of not ready. 2042 // Interface object should get the right size here. Regular class will 2043 // figure out the right size later and be replaced with one of the right 2044 // size when the class becomes resolved. 2045 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2046 } 2047 if (UNLIKELY(klass.Get() == nullptr)) { 2048 CHECK(self->IsExceptionPending()); // Expect an OOME. 2049 return nullptr; 2050 } 2051 klass->SetDexCache(FindDexCache(dex_file)); 2052 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 2053 ObjectLock<mirror::Class> lock(self, klass); 2054 if (self->IsExceptionPending()) { 2055 // An exception occured during load, set status to erroneous while holding klass' lock in case 2056 // notification is necessary. 2057 if (!klass->IsErroneous()) { 2058 klass->SetStatus(mirror::Class::kStatusError, self); 2059 } 2060 return nullptr; 2061 } 2062 klass->SetClinitThreadId(self->GetTid()); 2063 2064 // Add the newly loaded class to the loaded classes table. 2065 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 2066 if (existing != nullptr) { 2067 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2068 // this thread to block. 2069 return EnsureResolved(self, descriptor, existing); 2070 } 2071 2072 // Finish loading (if necessary) by finding parents 2073 CHECK(!klass->IsLoaded()); 2074 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2075 // Loading failed. 2076 if (!klass->IsErroneous()) { 2077 klass->SetStatus(mirror::Class::kStatusError, self); 2078 } 2079 return nullptr; 2080 } 2081 CHECK(klass->IsLoaded()); 2082 // Link the class (if necessary) 2083 CHECK(!klass->IsResolved()); 2084 // TODO: Use fast jobjects? 2085 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2086 2087 mirror::Class* new_class = nullptr; 2088 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2089 // Linking failed. 2090 if (!klass->IsErroneous()) { 2091 klass->SetStatus(mirror::Class::kStatusError, self); 2092 } 2093 return nullptr; 2094 } 2095 self->AssertNoPendingException(); 2096 CHECK(new_class != nullptr) << descriptor; 2097 CHECK(new_class->IsResolved()) << descriptor; 2098 2099 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2100 2101 /* 2102 * We send CLASS_PREPARE events to the debugger from here. The 2103 * definition of "preparation" is creating the static fields for a 2104 * class and initializing them to the standard default values, but not 2105 * executing any code (that comes later, during "initialization"). 2106 * 2107 * We did the static preparation in LinkClass. 2108 * 2109 * The class has been prepared and resolved but possibly not yet verified 2110 * at this point. 2111 */ 2112 Dbg::PostClassPrepare(new_class_h.Get()); 2113 2114 return new_class_h.Get(); 2115} 2116 2117uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2118 const DexFile::ClassDef& dex_class_def) { 2119 const byte* class_data = dex_file.GetClassData(dex_class_def); 2120 size_t num_ref = 0; 2121 size_t num_32 = 0; 2122 size_t num_64 = 0; 2123 if (class_data != NULL) { 2124 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2125 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2126 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2127 char c = descriptor[0]; 2128 if (c == 'L' || c == '[') { 2129 num_ref++; 2130 } else if (c == 'J' || c == 'D') { 2131 num_64++; 2132 } else { 2133 num_32++; 2134 } 2135 } 2136 } 2137 return mirror::Class::ComputeClassSize(false, 0, num_32, num_64, num_ref); 2138} 2139 2140bool ClassLinker::FindOatClass(const DexFile& dex_file, 2141 uint16_t class_def_idx, 2142 OatFile::OatClass* oat_class) { 2143 DCHECK(oat_class != nullptr); 2144 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2145 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2146 if (oat_file == nullptr) { 2147 return false; 2148 } 2149 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2150 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2151 &dex_location_checksum); 2152 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 2153 *oat_class = oat_dex_file->GetOatClass(class_def_idx); 2154 return true; 2155} 2156 2157static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2158 uint32_t method_idx) { 2159 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2160 const byte* class_data = dex_file.GetClassData(class_def); 2161 CHECK(class_data != NULL); 2162 ClassDataItemIterator it(dex_file, class_data); 2163 // Skip fields 2164 while (it.HasNextStaticField()) { 2165 it.Next(); 2166 } 2167 while (it.HasNextInstanceField()) { 2168 it.Next(); 2169 } 2170 // Process methods 2171 size_t class_def_method_index = 0; 2172 while (it.HasNextDirectMethod()) { 2173 if (it.GetMemberIndex() == method_idx) { 2174 return class_def_method_index; 2175 } 2176 class_def_method_index++; 2177 it.Next(); 2178 } 2179 while (it.HasNextVirtualMethod()) { 2180 if (it.GetMemberIndex() == method_idx) { 2181 return class_def_method_index; 2182 } 2183 class_def_method_index++; 2184 it.Next(); 2185 } 2186 DCHECK(!it.HasNext()); 2187 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2188 return 0; 2189} 2190 2191bool ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, OatFile::OatMethod* oat_method) { 2192 DCHECK(oat_method != nullptr); 2193 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2194 // method for direct methods (or virtual methods made direct). 2195 mirror::Class* declaring_class = method->GetDeclaringClass(); 2196 size_t oat_method_index; 2197 if (method->IsStatic() || method->IsDirect()) { 2198 // Simple case where the oat method index was stashed at load time. 2199 oat_method_index = method->GetMethodIndex(); 2200 } else { 2201 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2202 // by search for its position in the declared virtual methods. 2203 oat_method_index = declaring_class->NumDirectMethods(); 2204 size_t end = declaring_class->NumVirtualMethods(); 2205 bool found = false; 2206 for (size_t i = 0; i < end; i++) { 2207 if (declaring_class->GetVirtualMethod(i) == method) { 2208 found = true; 2209 break; 2210 } 2211 oat_method_index++; 2212 } 2213 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2214 } 2215 DCHECK_EQ(oat_method_index, 2216 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2217 method->GetDeclaringClass()->GetDexClassDefIndex(), 2218 method->GetDexMethodIndex())); 2219 OatFile::OatClass oat_class; 2220 if (!FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2221 declaring_class->GetDexClassDefIndex(), 2222 &oat_class)) { 2223 return false; 2224 } 2225 2226 *oat_method = oat_class.GetOatMethod(oat_method_index); 2227 return true; 2228} 2229 2230// Special case to get oat code without overwriting a trampoline. 2231const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2232 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2233 if (method->IsProxyMethod()) { 2234 return GetQuickProxyInvokeHandler(); 2235 } 2236 OatFile::OatMethod oat_method; 2237 const void* result = nullptr; 2238 if (FindOatMethodFor(method, &oat_method)) { 2239 result = oat_method.GetQuickCode(); 2240 } 2241 2242 if (result == nullptr) { 2243 if (method->IsNative()) { 2244 // No code and native? Use generic trampoline. 2245 result = GetQuickGenericJniTrampoline(); 2246 } else if (method->IsPortableCompiled()) { 2247 // No code? Do we expect portable code? 2248 result = GetQuickToPortableBridge(); 2249 } else { 2250 // No code? You must mean to go into the interpreter. 2251 result = GetQuickToInterpreterBridge(); 2252 } 2253 } 2254 return result; 2255} 2256 2257const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2258 bool* have_portable_code) { 2259 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2260 *have_portable_code = false; 2261 if (method->IsProxyMethod()) { 2262 return GetPortableProxyInvokeHandler(); 2263 } 2264 OatFile::OatMethod oat_method; 2265 const void* result = nullptr; 2266 const void* quick_code = nullptr; 2267 if (FindOatMethodFor(method, &oat_method)) { 2268 result = oat_method.GetPortableCode(); 2269 quick_code = oat_method.GetQuickCode(); 2270 } 2271 2272 if (result == nullptr) { 2273 if (quick_code == nullptr) { 2274 // No code? You must mean to go into the interpreter. 2275 result = GetPortableToInterpreterBridge(); 2276 } else { 2277 // No code? But there's quick code, so use a bridge. 2278 result = GetPortableToQuickBridge(); 2279 } 2280 } else { 2281 *have_portable_code = true; 2282 } 2283 return result; 2284} 2285 2286const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2287 uint32_t method_idx) { 2288 OatFile::OatClass oat_class; 2289 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2290 return nullptr; 2291 } 2292 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2293 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2294} 2295 2296const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2297 uint32_t method_idx) { 2298 OatFile::OatClass oat_class; 2299 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2300 return nullptr; 2301 } 2302 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2303 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2304} 2305 2306// Returns true if the method must run with interpreter, false otherwise. 2307static bool NeedsInterpreter( 2308 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2309 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2310 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2311 // No code: need interpreter. 2312 // May return true for native code, in the case of generic JNI 2313 // DCHECK(!method->IsNative()); 2314 return true; 2315 } 2316#ifdef ART_SEA_IR_MODE 2317 ScopedObjectAccess soa(Thread::Current()); 2318 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2319 LOG(INFO) << "Found " << PrettyMethod(method); 2320 return false; 2321 } 2322#endif 2323 // If interpreter mode is enabled, every method (except native and proxy) must 2324 // be run with interpreter. 2325 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2326 !method->IsNative() && !method->IsProxyMethod(); 2327} 2328 2329void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2330 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2331 if (klass->NumDirectMethods() == 0) { 2332 return; // No direct methods => no static methods. 2333 } 2334 Runtime* runtime = Runtime::Current(); 2335 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2336 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2337 return; // OAT file unavailable. 2338 } 2339 } 2340 2341 const DexFile& dex_file = klass->GetDexFile(); 2342 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2343 CHECK(dex_class_def != nullptr); 2344 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2345 // There should always be class data if there were direct methods. 2346 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2347 ClassDataItemIterator it(dex_file, class_data); 2348 // Skip fields 2349 while (it.HasNextStaticField()) { 2350 it.Next(); 2351 } 2352 while (it.HasNextInstanceField()) { 2353 it.Next(); 2354 } 2355 OatFile::OatClass oat_class; 2356 bool has_oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class); 2357 // Link the code of methods skipped by LinkCode. 2358 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2359 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2360 if (!method->IsStatic()) { 2361 // Only update static methods. 2362 continue; 2363 } 2364 const void* portable_code = nullptr; 2365 const void* quick_code = nullptr; 2366 if (has_oat_class) { 2367 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2368 portable_code = oat_method.GetPortableCode(); 2369 quick_code = oat_method.GetQuickCode(); 2370 } 2371 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2372 bool have_portable_code = false; 2373 if (enter_interpreter) { 2374 // Use interpreter entry point. 2375 // Check whether the method is native, in which case it's generic JNI. 2376 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2377 quick_code = GetQuickGenericJniTrampoline(); 2378 portable_code = GetPortableToQuickBridge(); 2379 } else { 2380 portable_code = GetPortableToInterpreterBridge(); 2381 quick_code = GetQuickToInterpreterBridge(); 2382 } 2383 } else { 2384 if (portable_code == nullptr) { 2385 portable_code = GetPortableToQuickBridge(); 2386 } else { 2387 have_portable_code = true; 2388 } 2389 if (quick_code == nullptr) { 2390 quick_code = GetQuickToPortableBridge(); 2391 } 2392 } 2393 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2394 have_portable_code); 2395 } 2396 // Ignore virtual methods on the iterator. 2397} 2398 2399void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 2400 const DexFile& dex_file, uint32_t dex_method_index, 2401 uint32_t method_index) { 2402 if (Runtime::Current()->IsCompiler()) { 2403 // The following code only applies to a non-compiler runtime. 2404 return; 2405 } 2406 // Method shouldn't have already been linked. 2407 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2408 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2409 if (oat_class != nullptr) { 2410 // Every kind of method should at least get an invoke stub from the oat_method. 2411 // non-abstract methods also get their code pointers. 2412 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2413 oat_method.LinkMethod(method.Get()); 2414 } 2415 2416 // Install entry point from interpreter. 2417 bool enter_interpreter = NeedsInterpreter(method.Get(), 2418 method->GetEntryPointFromQuickCompiledCode(), 2419 method->GetEntryPointFromPortableCompiledCode()); 2420 if (enter_interpreter && !method->IsNative()) { 2421 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2422 } else { 2423 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2424 } 2425 2426 if (method->IsAbstract()) { 2427 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2428 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2429 return; 2430 } 2431 2432 bool have_portable_code = false; 2433 if (method->IsStatic() && !method->IsConstructor()) { 2434 // For static methods excluding the class initializer, install the trampoline. 2435 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2436 // after initializing class (see ClassLinker::InitializeClass method). 2437 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2438 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2439 } else if (enter_interpreter) { 2440 if (!method->IsNative()) { 2441 // Set entry point from compiled code if there's no code or in interpreter only mode. 2442 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2443 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2444 } else { 2445 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2446 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2447 } 2448 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2449 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2450 have_portable_code = true; 2451 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2452 } else { 2453 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2454 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2455 } 2456 2457 if (method->IsNative()) { 2458 // Unregistering restores the dlsym lookup stub. 2459 method->UnregisterNative(Thread::Current()); 2460 2461 if (enter_interpreter) { 2462 // We have a native method here without code. Then it should have either the GenericJni 2463 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2464 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2465 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2466 } 2467 } 2468 2469 // Allow instrumentation its chance to hijack code. 2470 Runtime* runtime = Runtime::Current(); 2471 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2472 method->GetEntryPointFromQuickCompiledCode(), 2473 method->GetEntryPointFromPortableCompiledCode(), 2474 have_portable_code); 2475} 2476 2477void ClassLinker::LoadClass(const DexFile& dex_file, 2478 const DexFile::ClassDef& dex_class_def, 2479 Handle<mirror::Class> klass, 2480 mirror::ClassLoader* class_loader) { 2481 CHECK(klass.Get() != NULL); 2482 CHECK(klass->GetDexCache() != NULL); 2483 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2484 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2485 CHECK(descriptor != NULL); 2486 2487 klass->SetClass(GetClassRoot(kJavaLangClass)); 2488 if (kUseBakerOrBrooksReadBarrier) { 2489 klass->AssertReadBarrierPointer(); 2490 } 2491 uint32_t access_flags = dex_class_def.access_flags_; 2492 // Make sure that none of our runtime-only flags are set. 2493 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2494 klass->SetAccessFlags(access_flags); 2495 klass->SetClassLoader(class_loader); 2496 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2497 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2498 2499 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2500 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2501 2502 const byte* class_data = dex_file.GetClassData(dex_class_def); 2503 if (class_data == NULL) { 2504 return; // no fields or methods - for example a marker interface 2505 } 2506 2507 OatFile::OatClass oat_class; 2508 if (Runtime::Current()->IsStarted() 2509 && !Runtime::Current()->UseCompileTimeClassPath() 2510 && FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class)) { 2511 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2512 } else { 2513 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2514 } 2515} 2516 2517void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2518 const byte* class_data, 2519 Handle<mirror::Class> klass, 2520 mirror::ClassLoader* class_loader, 2521 const OatFile::OatClass* oat_class) { 2522 // Load fields. 2523 ClassDataItemIterator it(dex_file, class_data); 2524 Thread* self = Thread::Current(); 2525 if (it.NumStaticFields() != 0) { 2526 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2527 if (UNLIKELY(statics == NULL)) { 2528 CHECK(self->IsExceptionPending()); // OOME. 2529 return; 2530 } 2531 klass->SetSFields(statics); 2532 } 2533 if (it.NumInstanceFields() != 0) { 2534 mirror::ObjectArray<mirror::ArtField>* fields = 2535 AllocArtFieldArray(self, it.NumInstanceFields()); 2536 if (UNLIKELY(fields == NULL)) { 2537 CHECK(self->IsExceptionPending()); // OOME. 2538 return; 2539 } 2540 klass->SetIFields(fields); 2541 } 2542 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2543 StackHandleScope<1> hs(self); 2544 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2545 if (UNLIKELY(sfield.Get() == NULL)) { 2546 CHECK(self->IsExceptionPending()); // OOME. 2547 return; 2548 } 2549 klass->SetStaticField(i, sfield.Get()); 2550 LoadField(dex_file, it, klass, sfield); 2551 } 2552 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2553 StackHandleScope<1> hs(self); 2554 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2555 if (UNLIKELY(ifield.Get() == NULL)) { 2556 CHECK(self->IsExceptionPending()); // OOME. 2557 return; 2558 } 2559 klass->SetInstanceField(i, ifield.Get()); 2560 LoadField(dex_file, it, klass, ifield); 2561 } 2562 2563 // Load methods. 2564 if (it.NumDirectMethods() != 0) { 2565 // TODO: append direct methods to class object 2566 mirror::ObjectArray<mirror::ArtMethod>* directs = 2567 AllocArtMethodArray(self, it.NumDirectMethods()); 2568 if (UNLIKELY(directs == NULL)) { 2569 CHECK(self->IsExceptionPending()); // OOME. 2570 return; 2571 } 2572 klass->SetDirectMethods(directs); 2573 } 2574 if (it.NumVirtualMethods() != 0) { 2575 // TODO: append direct methods to class object 2576 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2577 AllocArtMethodArray(self, it.NumVirtualMethods()); 2578 if (UNLIKELY(virtuals == NULL)) { 2579 CHECK(self->IsExceptionPending()); // OOME. 2580 return; 2581 } 2582 klass->SetVirtualMethods(virtuals); 2583 } 2584 size_t class_def_method_index = 0; 2585 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2586 StackHandleScope<1> hs(self); 2587 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2588 if (UNLIKELY(method.Get() == NULL)) { 2589 CHECK(self->IsExceptionPending()); // OOME. 2590 return; 2591 } 2592 klass->SetDirectMethod(i, method.Get()); 2593 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2594 method->SetMethodIndex(class_def_method_index); 2595 class_def_method_index++; 2596 } 2597 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2598 StackHandleScope<1> hs(self); 2599 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2600 if (UNLIKELY(method.Get() == NULL)) { 2601 CHECK(self->IsExceptionPending()); // OOME. 2602 return; 2603 } 2604 klass->SetVirtualMethod(i, method.Get()); 2605 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2606 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2607 class_def_method_index++; 2608 } 2609 DCHECK(!it.HasNext()); 2610} 2611 2612void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2613 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2614 uint32_t field_idx = it.GetMemberIndex(); 2615 dst->SetDexFieldIndex(field_idx); 2616 dst->SetDeclaringClass(klass.Get()); 2617 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2618} 2619 2620mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2621 const ClassDataItemIterator& it, 2622 Handle<mirror::Class> klass) { 2623 uint32_t dex_method_idx = it.GetMemberIndex(); 2624 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2625 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2626 2627 mirror::ArtMethod* dst = AllocArtMethod(self); 2628 if (UNLIKELY(dst == NULL)) { 2629 CHECK(self->IsExceptionPending()); // OOME. 2630 return NULL; 2631 } 2632 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2633 2634 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2635 dst->SetDexMethodIndex(dex_method_idx); 2636 dst->SetDeclaringClass(klass.Get()); 2637 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2638 2639 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2640 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2641 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2642 2643 uint32_t access_flags = it.GetMemberAccessFlags(); 2644 2645 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2646 // Set finalizable flag on declaring class. 2647 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2648 // Void return type. 2649 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged. 2650 klass->SetFinalizable(); 2651 } else { 2652 std::string temp; 2653 const char* klass_descriptor = klass->GetDescriptor(&temp); 2654 // The Enum class declares a "final" finalize() method to prevent subclasses from 2655 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2656 // subclasses, so we exclude it here. 2657 // We also want to avoid setting the flag on Object, where we know that finalize() is 2658 // empty. 2659 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2660 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2661 klass->SetFinalizable(); 2662 } 2663 } 2664 } 2665 } else if (method_name[0] == '<') { 2666 // Fix broken access flags for initializers. Bug 11157540. 2667 bool is_init = (strcmp("<init>", method_name) == 0); 2668 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2669 if (UNLIKELY(!is_init && !is_clinit)) { 2670 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2671 } else { 2672 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2673 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2674 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2675 access_flags |= kAccConstructor; 2676 } 2677 } 2678 } 2679 dst->SetAccessFlags(access_flags); 2680 2681 self->EndAssertNoThreadSuspension(old_cause); 2682 return dst; 2683} 2684 2685void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2686 Thread* self = Thread::Current(); 2687 StackHandleScope<1> hs(self); 2688 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2689 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2690 AppendToBootClassPath(dex_file, dex_cache); 2691} 2692 2693void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2694 Handle<mirror::DexCache> dex_cache) { 2695 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2696 boot_class_path_.push_back(&dex_file); 2697 RegisterDexFile(dex_file, dex_cache); 2698} 2699 2700bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2701 dex_lock_.AssertSharedHeld(Thread::Current()); 2702 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2703 mirror::DexCache* dex_cache = GetDexCache(i); 2704 if (dex_cache->GetDexFile() == &dex_file) { 2705 return true; 2706 } 2707 } 2708 return false; 2709} 2710 2711bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2712 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2713 return IsDexFileRegisteredLocked(dex_file); 2714} 2715 2716void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2717 Handle<mirror::DexCache> dex_cache) { 2718 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2719 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2720 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2721 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2722 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2723 dex_cache->SetDexFile(&dex_file); 2724 if (log_new_dex_caches_roots_) { 2725 // TODO: This is not safe if we can remove dex caches. 2726 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2727 } 2728} 2729 2730void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2731 Thread* self = Thread::Current(); 2732 { 2733 ReaderMutexLock mu(self, dex_lock_); 2734 if (IsDexFileRegisteredLocked(dex_file)) { 2735 return; 2736 } 2737 } 2738 // Don't alloc while holding the lock, since allocation may need to 2739 // suspend all threads and another thread may need the dex_lock_ to 2740 // get to a suspend point. 2741 StackHandleScope<1> hs(self); 2742 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2743 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2744 { 2745 WriterMutexLock mu(self, dex_lock_); 2746 if (IsDexFileRegisteredLocked(dex_file)) { 2747 return; 2748 } 2749 RegisterDexFileLocked(dex_file, dex_cache); 2750 } 2751} 2752 2753void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2754 Handle<mirror::DexCache> dex_cache) { 2755 WriterMutexLock mu(Thread::Current(), dex_lock_); 2756 RegisterDexFileLocked(dex_file, dex_cache); 2757} 2758 2759mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2760 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2761 // Search assuming unique-ness of dex file. 2762 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2763 mirror::DexCache* dex_cache = GetDexCache(i); 2764 if (dex_cache->GetDexFile() == &dex_file) { 2765 return dex_cache; 2766 } 2767 } 2768 // Search matching by location name. 2769 std::string location(dex_file.GetLocation()); 2770 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2771 mirror::DexCache* dex_cache = GetDexCache(i); 2772 if (dex_cache->GetDexFile()->GetLocation() == location) { 2773 return dex_cache; 2774 } 2775 } 2776 // Failure, dump diagnostic and abort. 2777 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2778 mirror::DexCache* dex_cache = GetDexCache(i); 2779 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2780 } 2781 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2782 return NULL; 2783} 2784 2785void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2786 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2787 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2788 mirror::DexCache* dex_cache = GetDexCache(i); 2789 dex_cache->Fixup(resolution_method); 2790 } 2791} 2792 2793mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2794 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 2795 if (UNLIKELY(klass == NULL)) { 2796 return NULL; 2797 } 2798 return InitializePrimitiveClass(klass, type); 2799} 2800 2801mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2802 Primitive::Type type) { 2803 CHECK(primitive_class != NULL); 2804 // Must hold lock on object when initializing. 2805 Thread* self = Thread::Current(); 2806 StackHandleScope<1> hs(self); 2807 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2808 ObjectLock<mirror::Class> lock(self, h_class); 2809 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2810 primitive_class->SetPrimitiveType(type); 2811 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2812 const char* descriptor = Primitive::Descriptor(type); 2813 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2814 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2815 return primitive_class; 2816} 2817 2818// Create an array class (i.e. the class object for the array, not the 2819// array itself). "descriptor" looks like "[C" or "[[[[B" or 2820// "[Ljava/lang/String;". 2821// 2822// If "descriptor" refers to an array of primitives, look up the 2823// primitive type's internally-generated class object. 2824// 2825// "class_loader" is the class loader of the class that's referring to 2826// us. It's used to ensure that we're looking for the element type in 2827// the right context. It does NOT become the class loader for the 2828// array class; that always comes from the base element class. 2829// 2830// Returns NULL with an exception raised on failure. 2831mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2832 Handle<mirror::ClassLoader> class_loader) { 2833 // Identify the underlying component type 2834 CHECK_EQ('[', descriptor[0]); 2835 StackHandleScope<2> hs(self); 2836 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2837 if (component_type.Get() == nullptr) { 2838 DCHECK(self->IsExceptionPending()); 2839 // We need to accept erroneous classes as component types. 2840 component_type.Assign(LookupClass(descriptor + 1, class_loader.Get())); 2841 if (component_type.Get() == nullptr) { 2842 DCHECK(self->IsExceptionPending()); 2843 return nullptr; 2844 } else { 2845 self->ClearException(); 2846 } 2847 } 2848 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2849 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2850 return nullptr; 2851 } 2852 // See if the component type is already loaded. Array classes are 2853 // always associated with the class loader of their underlying 2854 // element type -- an array of Strings goes with the loader for 2855 // java/lang/String -- so we need to look for it there. (The 2856 // caller should have checked for the existence of the class 2857 // before calling here, but they did so with *their* class loader, 2858 // not the component type's loader.) 2859 // 2860 // If we find it, the caller adds "loader" to the class' initiating 2861 // loader list, which should prevent us from going through this again. 2862 // 2863 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2864 // are the same, because our caller (FindClass) just did the 2865 // lookup. (Even if we get this wrong we still have correct behavior, 2866 // because we effectively do this lookup again when we add the new 2867 // class to the hash table --- necessary because of possible races with 2868 // other threads.) 2869 if (class_loader.Get() != component_type->GetClassLoader()) { 2870 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2871 if (new_class != NULL) { 2872 return new_class; 2873 } 2874 } 2875 2876 // Fill out the fields in the Class. 2877 // 2878 // It is possible to execute some methods against arrays, because 2879 // all arrays are subclasses of java_lang_Object_, so we need to set 2880 // up a vtable. We can just point at the one in java_lang_Object_. 2881 // 2882 // Array classes are simple enough that we don't need to do a full 2883 // link step. 2884 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2885 if (UNLIKELY(!init_done_)) { 2886 // Classes that were hand created, ie not by FindSystemClass 2887 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2888 new_class.Assign(GetClassRoot(kClassArrayClass)); 2889 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2890 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2891 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2892 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2893 } else if (strcmp(descriptor, 2894 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2895 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2896 } else if (strcmp(descriptor, 2897 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2898 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2899 } else if (strcmp(descriptor, "[C") == 0) { 2900 new_class.Assign(GetClassRoot(kCharArrayClass)); 2901 } else if (strcmp(descriptor, "[I") == 0) { 2902 new_class.Assign(GetClassRoot(kIntArrayClass)); 2903 } 2904 } 2905 if (new_class.Get() == nullptr) { 2906 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 2907 if (new_class.Get() == nullptr) { 2908 return nullptr; 2909 } 2910 new_class->SetComponentType(component_type.Get()); 2911 } 2912 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2913 DCHECK(new_class->GetComponentType() != NULL); 2914 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2915 new_class->SetSuperClass(java_lang_Object); 2916 new_class->SetVTable(java_lang_Object->GetVTable()); 2917 new_class->SetPrimitiveType(Primitive::kPrimNot); 2918 new_class->SetClassLoader(component_type->GetClassLoader()); 2919 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 2920 new_class->PopulateEmbeddedImtAndVTable(); 2921 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2922 // don't need to set new_class->SetObjectSize(..) 2923 // because Object::SizeOf delegates to Array::SizeOf 2924 2925 2926 // All arrays have java/lang/Cloneable and java/io/Serializable as 2927 // interfaces. We need to set that up here, so that stuff like 2928 // "instanceof" works right. 2929 // 2930 // Note: The GC could run during the call to FindSystemClass, 2931 // so we need to make sure the class object is GC-valid while we're in 2932 // there. Do this by clearing the interface list so the GC will just 2933 // think that the entries are null. 2934 2935 2936 // Use the single, global copies of "interfaces" and "iftable" 2937 // (remember not to free them for arrays). 2938 { 2939 mirror::IfTable* array_iftable = array_iftable_.Read(); 2940 CHECK(array_iftable != nullptr); 2941 new_class->SetIfTable(array_iftable); 2942 } 2943 2944 // Inherit access flags from the component type. 2945 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2946 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2947 access_flags &= kAccJavaFlagsMask; 2948 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2949 // and remove "interface". 2950 access_flags |= kAccAbstract | kAccFinal; 2951 access_flags &= ~kAccInterface; 2952 2953 new_class->SetAccessFlags(access_flags); 2954 2955 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2956 if (existing == nullptr) { 2957 return new_class.Get(); 2958 } 2959 // Another thread must have loaded the class after we 2960 // started but before we finished. Abandon what we've 2961 // done. 2962 // 2963 // (Yes, this happens.) 2964 2965 return existing; 2966} 2967 2968mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2969 switch (type) { 2970 case 'B': 2971 return GetClassRoot(kPrimitiveByte); 2972 case 'C': 2973 return GetClassRoot(kPrimitiveChar); 2974 case 'D': 2975 return GetClassRoot(kPrimitiveDouble); 2976 case 'F': 2977 return GetClassRoot(kPrimitiveFloat); 2978 case 'I': 2979 return GetClassRoot(kPrimitiveInt); 2980 case 'J': 2981 return GetClassRoot(kPrimitiveLong); 2982 case 'S': 2983 return GetClassRoot(kPrimitiveShort); 2984 case 'Z': 2985 return GetClassRoot(kPrimitiveBoolean); 2986 case 'V': 2987 return GetClassRoot(kPrimitiveVoid); 2988 default: 2989 break; 2990 } 2991 std::string printable_type(PrintableChar(type)); 2992 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2993 return NULL; 2994} 2995 2996mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2997 size_t hash) { 2998 if (VLOG_IS_ON(class_linker)) { 2999 mirror::DexCache* dex_cache = klass->GetDexCache(); 3000 std::string source; 3001 if (dex_cache != NULL) { 3002 source += " from "; 3003 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3004 } 3005 LOG(INFO) << "Loaded class " << descriptor << source; 3006 } 3007 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3008 mirror::Class* existing = 3009 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3010 if (existing != NULL) { 3011 return existing; 3012 } 3013 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == NULL && 3014 dex_cache_image_class_lookup_required_) { 3015 // Check a class loaded with the system class loader matches one in the image if the class 3016 // is in the image. 3017 existing = LookupClassFromImage(descriptor); 3018 if (existing != NULL) { 3019 CHECK(klass == existing); 3020 } 3021 } 3022 VerifyObject(klass); 3023 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3024 if (log_new_class_table_roots_) { 3025 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3026 } 3027 return NULL; 3028} 3029 3030mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3031 size_t hash) { 3032 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3033 mirror::Class* existing = 3034 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3035 3036 if (existing == nullptr) { 3037 CHECK(klass->IsProxyClass()); 3038 return nullptr; 3039 } 3040 3041 CHECK_NE(existing, klass) << descriptor; 3042 CHECK(!existing->IsResolved()) << descriptor; 3043 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3044 3045 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 3046 ++it) { 3047 mirror::Class* klass = it->second.Read(); 3048 if (klass == existing) { 3049 class_table_.erase(it); 3050 break; 3051 } 3052 } 3053 3054 CHECK(!klass->IsTemp()) << descriptor; 3055 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3056 dex_cache_image_class_lookup_required_) { 3057 // Check a class loaded with the system class loader matches one in the image if the class 3058 // is in the image. 3059 existing = LookupClassFromImage(descriptor); 3060 if (existing != nullptr) { 3061 CHECK(klass == existing) << descriptor; 3062 } 3063 } 3064 VerifyObject(klass); 3065 3066 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3067 if (log_new_class_table_roots_) { 3068 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3069 } 3070 3071 return existing; 3072} 3073 3074bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 3075 size_t hash = Hash(descriptor); 3076 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3077 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3078 it != end && it->first == hash; 3079 ++it) { 3080 mirror::Class* klass = it->second.Read(); 3081 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3082 class_table_.erase(it); 3083 return true; 3084 } 3085 } 3086 return false; 3087} 3088 3089mirror::Class* ClassLinker::LookupClass(const char* descriptor, 3090 const mirror::ClassLoader* class_loader) { 3091 size_t hash = Hash(descriptor); 3092 { 3093 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3094 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3095 if (result != NULL) { 3096 return result; 3097 } 3098 } 3099 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 3100 return NULL; 3101 } else { 3102 // Lookup failed but need to search dex_caches_. 3103 mirror::Class* result = LookupClassFromImage(descriptor); 3104 if (result != NULL) { 3105 InsertClass(descriptor, result, hash); 3106 } else { 3107 // Searching the image dex files/caches failed, we don't want to get into this situation 3108 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3109 // classes into the class table. 3110 const int32_t kMaxFailedDexCacheLookups = 1000; 3111 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3112 MoveImageClassesToClassTable(); 3113 } 3114 } 3115 return result; 3116 } 3117} 3118 3119mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3120 const mirror::ClassLoader* class_loader, 3121 size_t hash) { 3122 auto end = class_table_.end(); 3123 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3124 mirror::Class* klass = it->second.Read(); 3125 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3126 if (kIsDebugBuild) { 3127 // Check for duplicates in the table. 3128 for (++it; it != end && it->first == hash; ++it) { 3129 mirror::Class* klass2 = it->second.Read(); 3130 CHECK(!(klass2->GetClassLoader() == class_loader && 3131 klass2->DescriptorEquals(descriptor))) 3132 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3133 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3134 } 3135 } 3136 return klass; 3137 } 3138 } 3139 return NULL; 3140} 3141 3142static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3143 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3144 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3145 CHECK(image != NULL); 3146 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3147 return root->AsObjectArray<mirror::DexCache>(); 3148} 3149 3150void ClassLinker::MoveImageClassesToClassTable() { 3151 Thread* self = Thread::Current(); 3152 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3153 if (!dex_cache_image_class_lookup_required_) { 3154 return; // All dex cache classes are already in the class table. 3155 } 3156 const char* old_no_suspend_cause = 3157 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 3158 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3159 std::string temp; 3160 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3161 mirror::DexCache* dex_cache = dex_caches->Get(i); 3162 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3163 for (int32_t j = 0; j < types->GetLength(); j++) { 3164 mirror::Class* klass = types->Get(j); 3165 if (klass != NULL) { 3166 DCHECK(klass->GetClassLoader() == NULL); 3167 const char* descriptor = klass->GetDescriptor(&temp); 3168 size_t hash = Hash(descriptor); 3169 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 3170 if (existing != NULL) { 3171 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3172 << PrettyClassAndClassLoader(klass); 3173 } else { 3174 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3175 if (log_new_class_table_roots_) { 3176 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3177 } 3178 } 3179 } 3180 } 3181 } 3182 dex_cache_image_class_lookup_required_ = false; 3183 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3184} 3185 3186mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3187 Thread* self = Thread::Current(); 3188 const char* old_no_suspend_cause = 3189 self->StartAssertNoThreadSuspension("Image class lookup"); 3190 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3191 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3192 mirror::DexCache* dex_cache = dex_caches->Get(i); 3193 const DexFile* dex_file = dex_cache->GetDexFile(); 3194 // Try binary searching the string/type index. 3195 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3196 if (string_id != NULL) { 3197 const DexFile::TypeId* type_id = 3198 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3199 if (type_id != NULL) { 3200 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3201 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3202 if (klass != NULL) { 3203 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3204 return klass; 3205 } 3206 } 3207 } 3208 } 3209 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3210 return NULL; 3211} 3212 3213void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3214 result.clear(); 3215 if (dex_cache_image_class_lookup_required_) { 3216 MoveImageClassesToClassTable(); 3217 } 3218 size_t hash = Hash(descriptor); 3219 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3220 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3221 it != end && it->first == hash; ++it) { 3222 mirror::Class* klass = it->second.Read(); 3223 if (klass->DescriptorEquals(descriptor)) { 3224 result.push_back(klass); 3225 } 3226 } 3227} 3228 3229void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 3230 // TODO: assert that the monitor on the Class is held 3231 Thread* self = Thread::Current(); 3232 ObjectLock<mirror::Class> lock(self, klass); 3233 3234 // Don't attempt to re-verify if already sufficiently verified. 3235 if (klass->IsVerified() || 3236 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 3237 return; 3238 } 3239 3240 // The class might already be erroneous, for example at compile time if we attempted to verify 3241 // this class as a parent to another. 3242 if (klass->IsErroneous()) { 3243 ThrowEarlierClassFailure(klass.Get()); 3244 return; 3245 } 3246 3247 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3248 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3249 } else { 3250 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3251 << PrettyClass(klass.Get()); 3252 CHECK(!Runtime::Current()->IsCompiler()); 3253 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3254 } 3255 3256 // Skip verification if disabled. 3257 if (!Runtime::Current()->IsVerificationEnabled()) { 3258 klass->SetStatus(mirror::Class::kStatusVerified, self); 3259 return; 3260 } 3261 3262 // Verify super class. 3263 StackHandleScope<2> hs(self); 3264 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3265 if (super.Get() != NULL) { 3266 // Acquire lock to prevent races on verifying the super class. 3267 ObjectLock<mirror::Class> lock(self, super); 3268 3269 if (!super->IsVerified() && !super->IsErroneous()) { 3270 VerifyClass(super); 3271 } 3272 if (!super->IsCompileTimeVerified()) { 3273 std::string error_msg( 3274 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3275 PrettyDescriptor(klass.Get()).c_str(), 3276 PrettyDescriptor(super.Get()).c_str())); 3277 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3278 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3279 if (cause.Get() != nullptr) { 3280 self->ClearException(); 3281 } 3282 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3283 if (cause.Get() != nullptr) { 3284 self->GetException(nullptr)->SetCause(cause.Get()); 3285 } 3286 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3287 if (Runtime::Current()->IsCompiler()) { 3288 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3289 } 3290 klass->SetStatus(mirror::Class::kStatusError, self); 3291 return; 3292 } 3293 } 3294 3295 // Try to use verification information from the oat file, otherwise do runtime verification. 3296 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3297 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3298 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3299 if (oat_file_class_status == mirror::Class::kStatusError) { 3300 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3301 << PrettyDescriptor(klass.Get()) << " in " 3302 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3303 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3304 PrettyDescriptor(klass.Get()).c_str()); 3305 klass->SetStatus(mirror::Class::kStatusError, self); 3306 return; 3307 } 3308 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3309 std::string error_msg; 3310 if (!preverified) { 3311 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 3312 Runtime::Current()->IsCompiler(), 3313 &error_msg); 3314 } 3315 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3316 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3317 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3318 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3319 << " because: " << error_msg; 3320 } 3321 self->AssertNoPendingException(); 3322 // Make sure all classes referenced by catch blocks are resolved. 3323 ResolveClassExceptionHandlerTypes(dex_file, klass); 3324 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3325 // Even though there were no verifier failures we need to respect whether the super-class 3326 // was verified or requiring runtime reverification. 3327 if (super.Get() == NULL || super->IsVerified()) { 3328 klass->SetStatus(mirror::Class::kStatusVerified, self); 3329 } else { 3330 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3331 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3332 // Pretend a soft failure occured so that we don't consider the class verified below. 3333 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3334 } 3335 } else { 3336 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3337 // Soft failures at compile time should be retried at runtime. Soft 3338 // failures at runtime will be handled by slow paths in the generated 3339 // code. Set status accordingly. 3340 if (Runtime::Current()->IsCompiler()) { 3341 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3342 } else { 3343 klass->SetStatus(mirror::Class::kStatusVerified, self); 3344 } 3345 } 3346 } else { 3347 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3348 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3349 << " because: " << error_msg; 3350 self->AssertNoPendingException(); 3351 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3352 klass->SetStatus(mirror::Class::kStatusError, self); 3353 } 3354 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3355 // Class is verified so we don't need to do any access check on its methods. 3356 // Let the interpreter know it by setting the kAccPreverified flag onto each 3357 // method. 3358 // Note: we're going here during compilation and at runtime. When we set the 3359 // kAccPreverified flag when compiling image classes, the flag is recorded 3360 // in the image and is set when loading the image. 3361 klass->SetPreverifiedFlagOnAllMethods(); 3362 } 3363} 3364 3365bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3366 mirror::Class::Status& oat_file_class_status) { 3367 // If we're compiling, we can only verify the class using the oat file if 3368 // we are not compiling the image or if the class we're verifying is not part of 3369 // the app. In other words, we will only check for preverification of bootclasspath 3370 // classes. 3371 if (Runtime::Current()->IsCompiler()) { 3372 // Are we compiling the bootclasspath? 3373 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3374 return false; 3375 } 3376 // We are compiling an app (not the image). 3377 3378 // Is this an app class? (I.e. not a bootclasspath class) 3379 if (klass->GetClassLoader() != NULL) { 3380 return false; 3381 } 3382 } 3383 3384 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 3385 // Make this work with gtests, which do not set up the image properly. 3386 // TODO: we should clean up gtests to set up the image path properly. 3387 if (Runtime::Current()->IsCompiler() || (oat_file == NULL)) { 3388 return false; 3389 } 3390 3391 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3392 uint dex_location_checksum = dex_file.GetLocationChecksum(); 3393 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 3394 &dex_location_checksum); 3395 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3396 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3397 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3398 if (oat_file_class_status == mirror::Class::kStatusVerified || 3399 oat_file_class_status == mirror::Class::kStatusInitialized) { 3400 return true; 3401 } 3402 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3403 // Compile time verification failed with a soft error. Compile time verification can fail 3404 // because we have incomplete type information. Consider the following: 3405 // class ... { 3406 // Foo x; 3407 // .... () { 3408 // if (...) { 3409 // v1 gets assigned a type of resolved class Foo 3410 // } else { 3411 // v1 gets assigned a type of unresolved class Bar 3412 // } 3413 // iput x = v1 3414 // } } 3415 // when we merge v1 following the if-the-else it results in Conflict 3416 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3417 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3418 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3419 // at compile time). 3420 return false; 3421 } 3422 if (oat_file_class_status == mirror::Class::kStatusError) { 3423 // Compile time verification failed with a hard error. This is caused by invalid instructions 3424 // in the class. These errors are unrecoverable. 3425 return false; 3426 } 3427 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3428 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3429 // not loading the class. 3430 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3431 // isn't a problem and this case shouldn't occur 3432 return false; 3433 } 3434 std::string temp; 3435 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3436 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3437 << klass->GetDescriptor(&temp); 3438 3439 return false; 3440} 3441 3442void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3443 Handle<mirror::Class> klass) { 3444 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3445 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3446 } 3447 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3448 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3449 } 3450} 3451 3452void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3453 mirror::ArtMethod* method) { 3454 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3455 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3456 if (code_item == NULL) { 3457 return; // native or abstract method 3458 } 3459 if (code_item->tries_size_ == 0) { 3460 return; // nothing to process 3461 } 3462 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3463 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3464 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3465 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3466 CatchHandlerIterator iterator(handlers_ptr); 3467 for (; iterator.HasNext(); iterator.Next()) { 3468 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3469 // unresolved exception types will be ignored by exception delivery 3470 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3471 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3472 if (exception_type == NULL) { 3473 DCHECK(Thread::Current()->IsExceptionPending()); 3474 Thread::Current()->ClearException(); 3475 } 3476 } 3477 } 3478 handlers_ptr = iterator.EndDataPointer(); 3479 } 3480} 3481 3482static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3483static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3484 Handle<mirror::ArtMethod> prototype); 3485 3486mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3487 jobjectArray interfaces, jobject loader, 3488 jobjectArray methods, jobjectArray throws) { 3489 Thread* self = soa.Self(); 3490 StackHandleScope<8> hs(self); 3491 Handle<mirror::Class> klass(hs.NewHandle( 3492 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3493 if (klass.Get() == NULL) { 3494 CHECK(self->IsExceptionPending()); // OOME. 3495 return NULL; 3496 } 3497 DCHECK(klass->GetClass() != NULL); 3498 klass->SetObjectSize(sizeof(mirror::Proxy)); 3499 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 3500 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3501 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3502 klass->SetName(soa.Decode<mirror::String*>(name)); 3503 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3504 klass->SetDexCache(proxy_class->GetDexCache()); 3505 klass->SetStatus(mirror::Class::kStatusIdx, self); 3506 3507 // Instance fields are inherited, but we add a couple of static fields... 3508 { 3509 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3510 if (UNLIKELY(sfields == NULL)) { 3511 CHECK(self->IsExceptionPending()); // OOME. 3512 return NULL; 3513 } 3514 klass->SetSFields(sfields); 3515 } 3516 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3517 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3518 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3519 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3520 CHECK(self->IsExceptionPending()); // OOME. 3521 return nullptr; 3522 } 3523 klass->SetStaticField(0, interfaces_sfield.Get()); 3524 interfaces_sfield->SetDexFieldIndex(0); 3525 interfaces_sfield->SetDeclaringClass(klass.Get()); 3526 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3527 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3528 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3529 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3530 CHECK(self->IsExceptionPending()); // OOME. 3531 return nullptr; 3532 } 3533 klass->SetStaticField(1, throws_sfield.Get()); 3534 throws_sfield->SetDexFieldIndex(1); 3535 throws_sfield->SetDeclaringClass(klass.Get()); 3536 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3537 3538 // Proxies have 1 direct method, the constructor 3539 { 3540 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3541 if (UNLIKELY(directs == nullptr)) { 3542 CHECK(self->IsExceptionPending()); // OOME. 3543 return nullptr; 3544 } 3545 klass->SetDirectMethods(directs); 3546 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3547 if (UNLIKELY(constructor == nullptr)) { 3548 CHECK(self->IsExceptionPending()); // OOME. 3549 return nullptr; 3550 } 3551 klass->SetDirectMethod(0, constructor); 3552 } 3553 3554 // Create virtual method using specified prototypes. 3555 size_t num_virtual_methods = 3556 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3557 { 3558 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3559 num_virtual_methods); 3560 if (UNLIKELY(virtuals == NULL)) { 3561 CHECK(self->IsExceptionPending()); // OOME. 3562 return NULL; 3563 } 3564 klass->SetVirtualMethods(virtuals); 3565 } 3566 for (size_t i = 0; i < num_virtual_methods; ++i) { 3567 StackHandleScope<1> hs(self); 3568 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3569 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3570 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3571 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3572 if (UNLIKELY(clone == nullptr)) { 3573 CHECK(self->IsExceptionPending()); // OOME. 3574 return nullptr; 3575 } 3576 klass->SetVirtualMethod(i, clone); 3577 } 3578 3579 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3580 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3581 self->AssertNoPendingException(); 3582 3583 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3584 mirror::Class* new_class = nullptr; 3585 { 3586 ObjectLock<mirror::Class> resolution_lock(self, klass); // Must hold lock on object when resolved. 3587 // Link the fields and virtual methods, creating vtable and iftables 3588 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3589 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3590 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3591 klass->SetStatus(mirror::Class::kStatusError, self); 3592 return nullptr; 3593 } 3594 } 3595 3596 CHECK(klass->IsRetired()); 3597 CHECK_NE(klass.Get(), new_class); 3598 klass.Assign(new_class); 3599 3600 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3601 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3602 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3603 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3604 3605 { 3606 // Lock on klass is released. Lock new class object. 3607 ObjectLock<mirror::Class> initialization_lock(self, klass); 3608 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3609 } 3610 3611 // sanity checks 3612 if (kIsDebugBuild) { 3613 CHECK(klass->GetIFields() == nullptr); 3614 CheckProxyConstructor(klass->GetDirectMethod(0)); 3615 for (size_t i = 0; i < num_virtual_methods; ++i) { 3616 StackHandleScope<2> hs(self); 3617 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3618 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3619 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3620 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3621 CheckProxyMethod(virtual_method, prototype); 3622 } 3623 3624 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3625 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3626 decoded_name->ToModifiedUtf8().c_str())); 3627 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3628 3629 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3630 decoded_name->ToModifiedUtf8().c_str())); 3631 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3632 3633 CHECK_EQ(klass.Get()->GetInterfaces(), 3634 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3635 CHECK_EQ(klass.Get()->GetThrows(), 3636 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3637 } 3638 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3639 CHECK(existing == nullptr); 3640 return klass.Get(); 3641} 3642 3643std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3644 DCHECK(proxy_class->IsProxyClass()); 3645 mirror::String* name = proxy_class->GetName(); 3646 DCHECK(name != NULL); 3647 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3648} 3649 3650mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3651 mirror::ArtMethod* proxy_method) { 3652 DCHECK(proxy_class->IsProxyClass()); 3653 DCHECK(proxy_method->IsProxyMethod()); 3654 // Locate the dex cache of the original interface/Object 3655 mirror::DexCache* dex_cache = nullptr; 3656 { 3657 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3658 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3659 mirror::DexCache* a_dex_cache = GetDexCache(i); 3660 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3661 dex_cache = a_dex_cache; 3662 break; 3663 } 3664 } 3665 } 3666 CHECK(dex_cache != nullptr); 3667 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3668 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3669 CHECK(resolved_method != nullptr); 3670 return resolved_method; 3671} 3672 3673 3674mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3675 Handle<mirror::Class> klass, 3676 mirror::Class* proxy_class) { 3677 // Create constructor for Proxy that must initialize h 3678 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3679 proxy_class->GetDirectMethods(); 3680 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3681 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3682 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 3683 // constructor method. 3684 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 3685 proxy_constructor); 3686 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3687 // code_ too) 3688 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3689 if (constructor == nullptr) { 3690 CHECK(self->IsExceptionPending()); // OOME. 3691 return nullptr; 3692 } 3693 // Make this constructor public and fix the class to be our Proxy version 3694 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3695 constructor->SetDeclaringClass(klass.Get()); 3696 return constructor; 3697} 3698 3699static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3700 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3701 CHECK(constructor->IsConstructor()); 3702 CHECK_STREQ(constructor->GetName(), "<init>"); 3703 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3704 "(Ljava/lang/reflect/InvocationHandler;)V"); 3705 DCHECK(constructor->IsPublic()); 3706} 3707 3708mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3709 Handle<mirror::Class> klass, 3710 Handle<mirror::ArtMethod> prototype) { 3711 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3712 // prototype method 3713 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3714 prototype.Get()); 3715 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3716 // as necessary 3717 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3718 if (UNLIKELY(method == NULL)) { 3719 CHECK(self->IsExceptionPending()); // OOME. 3720 return NULL; 3721 } 3722 3723 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3724 // the intersection of throw exceptions as defined in Proxy 3725 method->SetDeclaringClass(klass.Get()); 3726 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3727 3728 // At runtime the method looks like a reference and argument saving method, clone the code 3729 // related parameters from this method. 3730 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3731 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3732 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3733 3734 return method; 3735} 3736 3737static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3738 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3739 // Basic sanity 3740 CHECK(!prototype->IsFinal()); 3741 CHECK(method->IsFinal()); 3742 CHECK(!method->IsAbstract()); 3743 3744 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3745 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3746 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3747 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 3748 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 3749 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3750 3751 MethodHelper mh(method); 3752 MethodHelper mh2(prototype); 3753 CHECK_STREQ(method->GetName(), prototype->GetName()); 3754 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3755 // More complex sanity - via dex cache 3756 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3757} 3758 3759static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3760 bool can_init_parents) 3761 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3762 if (can_init_statics && can_init_parents) { 3763 return true; 3764 } 3765 if (!can_init_statics) { 3766 // Check if there's a class initializer. 3767 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3768 if (clinit != NULL) { 3769 return false; 3770 } 3771 // Check if there are encoded static values needing initialization. 3772 if (klass->NumStaticFields() != 0) { 3773 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3774 DCHECK(dex_class_def != NULL); 3775 if (dex_class_def->static_values_off_ != 0) { 3776 return false; 3777 } 3778 } 3779 } 3780 if (!klass->IsInterface() && klass->HasSuperClass()) { 3781 mirror::Class* super_class = klass->GetSuperClass(); 3782 if (!can_init_parents && !super_class->IsInitialized()) { 3783 return false; 3784 } else { 3785 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3786 return false; 3787 } 3788 } 3789 } 3790 return true; 3791} 3792 3793bool ClassLinker::IsInitialized() const { 3794 return init_done_; 3795} 3796 3797bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3798 bool can_init_parents) { 3799 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3800 3801 // Are we already initialized and therefore done? 3802 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3803 // an initialized class will never change its state. 3804 if (klass->IsInitialized()) { 3805 return true; 3806 } 3807 3808 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3809 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3810 return false; 3811 } 3812 3813 Thread* self = Thread::Current(); 3814 uint64_t t0; 3815 { 3816 ObjectLock<mirror::Class> lock(self, klass); 3817 3818 // Re-check under the lock in case another thread initialized ahead of us. 3819 if (klass->IsInitialized()) { 3820 return true; 3821 } 3822 3823 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3824 if (klass->IsErroneous()) { 3825 ThrowEarlierClassFailure(klass.Get()); 3826 return false; 3827 } 3828 3829 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3830 3831 if (!klass->IsVerified()) { 3832 VerifyClass(klass); 3833 if (!klass->IsVerified()) { 3834 // We failed to verify, expect either the klass to be erroneous or verification failed at 3835 // compile time. 3836 if (klass->IsErroneous()) { 3837 CHECK(self->IsExceptionPending()); 3838 } else { 3839 CHECK(Runtime::Current()->IsCompiler()); 3840 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3841 } 3842 return false; 3843 } else { 3844 self->AssertNoPendingException(); 3845 } 3846 } 3847 3848 // If the class is kStatusInitializing, either this thread is 3849 // initializing higher up the stack or another thread has beat us 3850 // to initializing and we need to wait. Either way, this 3851 // invocation of InitializeClass will not be responsible for 3852 // running <clinit> and will return. 3853 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3854 // Could have got an exception during verification. 3855 if (self->IsExceptionPending()) { 3856 return false; 3857 } 3858 // We caught somebody else in the act; was it us? 3859 if (klass->GetClinitThreadId() == self->GetTid()) { 3860 // Yes. That's fine. Return so we can continue initializing. 3861 return true; 3862 } 3863 // No. That's fine. Wait for another thread to finish initializing. 3864 return WaitForInitializeClass(klass, self, lock); 3865 } 3866 3867 if (!ValidateSuperClassDescriptors(klass)) { 3868 klass->SetStatus(mirror::Class::kStatusError, self); 3869 return false; 3870 } 3871 3872 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3873 3874 // From here out other threads may observe that we're initializing and so changes of state 3875 // require the a notification. 3876 klass->SetClinitThreadId(self->GetTid()); 3877 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3878 3879 t0 = NanoTime(); 3880 } 3881 3882 // Initialize super classes, must be done while initializing for the JLS. 3883 if (!klass->IsInterface() && klass->HasSuperClass()) { 3884 mirror::Class* super_class = klass->GetSuperClass(); 3885 if (!super_class->IsInitialized()) { 3886 CHECK(!super_class->IsInterface()); 3887 CHECK(can_init_parents); 3888 StackHandleScope<1> hs(self); 3889 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3890 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3891 if (!super_initialized) { 3892 // The super class was verified ahead of entering initializing, we should only be here if 3893 // the super class became erroneous due to initialization. 3894 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3895 << "Super class initialization failed for " 3896 << PrettyDescriptor(handle_scope_super.Get()) 3897 << " that has unexpected status " << handle_scope_super->GetStatus() 3898 << "\nPending exception:\n" 3899 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3900 ObjectLock<mirror::Class> lock(self, klass); 3901 // Initialization failed because the super-class is erroneous. 3902 klass->SetStatus(mirror::Class::kStatusError, self); 3903 return false; 3904 } 3905 } 3906 } 3907 3908 if (klass->NumStaticFields() > 0) { 3909 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3910 CHECK(dex_class_def != NULL); 3911 const DexFile& dex_file = klass->GetDexFile(); 3912 StackHandleScope<2> hs(self); 3913 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3914 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3915 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3916 this, *dex_class_def); 3917 if (it.HasNext()) { 3918 CHECK(can_init_statics); 3919 // We reordered the fields, so we need to be able to map the 3920 // field indexes to the right fields. 3921 SafeMap<uint32_t, mirror::ArtField*> field_map; 3922 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3923 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3924 if (Runtime::Current()->IsActiveTransaction()) { 3925 it.ReadValueToField<true>(field_map.Get(i)); 3926 } else { 3927 it.ReadValueToField<false>(field_map.Get(i)); 3928 } 3929 } 3930 } 3931 } 3932 3933 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3934 if (clinit != NULL) { 3935 CHECK(can_init_statics); 3936 JValue result; 3937 clinit->Invoke(self, NULL, 0, &result, "V"); 3938 } 3939 3940 uint64_t t1 = NanoTime(); 3941 3942 bool success = true; 3943 { 3944 ObjectLock<mirror::Class> lock(self, klass); 3945 3946 if (self->IsExceptionPending()) { 3947 WrapExceptionInInitializer(); 3948 klass->SetStatus(mirror::Class::kStatusError, self); 3949 success = false; 3950 } else { 3951 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3952 RuntimeStats* thread_stats = self->GetStats(); 3953 ++global_stats->class_init_count; 3954 ++thread_stats->class_init_count; 3955 global_stats->class_init_time_ns += (t1 - t0); 3956 thread_stats->class_init_time_ns += (t1 - t0); 3957 // Set the class as initialized except if failed to initialize static fields. 3958 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3959 if (VLOG_IS_ON(class_linker)) { 3960 std::string temp; 3961 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 3962 klass->GetLocation(); 3963 } 3964 // Opportunistically set static method trampolines to their destination. 3965 FixupStaticTrampolines(klass.Get()); 3966 } 3967 } 3968 return success; 3969} 3970 3971bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3972 ObjectLock<mirror::Class>& lock) 3973 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3974 while (true) { 3975 self->AssertNoPendingException(); 3976 CHECK(!klass->IsInitialized()); 3977 lock.WaitIgnoringInterrupts(); 3978 3979 // When we wake up, repeat the test for init-in-progress. If 3980 // there's an exception pending (only possible if 3981 // "interruptShouldThrow" was set), bail out. 3982 if (self->IsExceptionPending()) { 3983 WrapExceptionInInitializer(); 3984 klass->SetStatus(mirror::Class::kStatusError, self); 3985 return false; 3986 } 3987 // Spurious wakeup? Go back to waiting. 3988 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3989 continue; 3990 } 3991 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3992 // Compile time initialization failed. 3993 return false; 3994 } 3995 if (klass->IsErroneous()) { 3996 // The caller wants an exception, but it was thrown in a 3997 // different thread. Synthesize one here. 3998 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3999 PrettyDescriptor(klass.Get()).c_str()); 4000 return false; 4001 } 4002 if (klass->IsInitialized()) { 4003 return true; 4004 } 4005 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4006 << klass->GetStatus(); 4007 } 4008 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 4009} 4010 4011bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 4012 if (klass->IsInterface()) { 4013 return true; 4014 } 4015 // Begin with the methods local to the superclass. 4016 StackHandleScope<2> hs(Thread::Current()); 4017 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4018 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4019 if (klass->HasSuperClass() && 4020 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4021 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4022 mh.ChangeMethod(klass->GetVTableEntry(i)); 4023 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 4024 if (mh.GetMethod() != super_mh.GetMethod() && 4025 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4026 ThrowLinkageError(klass.Get(), 4027 "Class %s method %s resolves differently in superclass %s", 4028 PrettyDescriptor(klass.Get()).c_str(), 4029 PrettyMethod(mh.GetMethod()).c_str(), 4030 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4031 return false; 4032 } 4033 } 4034 } 4035 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4036 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4037 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4038 for (uint32_t j = 0; j < num_methods; ++j) { 4039 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4040 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4041 if (mh.GetMethod() != super_mh.GetMethod() && 4042 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4043 ThrowLinkageError(klass.Get(), 4044 "Class %s method %s resolves differently in interface %s", 4045 PrettyDescriptor(klass.Get()).c_str(), 4046 PrettyMethod(mh.GetMethod()).c_str(), 4047 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4048 return false; 4049 } 4050 } 4051 } 4052 } 4053 return true; 4054} 4055 4056bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 4057 bool can_init_parents) { 4058 DCHECK(c.Get() != nullptr); 4059 if (c->IsInitialized()) { 4060 return true; 4061 } 4062 const bool success = InitializeClass(c, can_init_fields, can_init_parents); 4063 Thread* self = Thread::Current(); 4064 if (!success) { 4065 if (can_init_fields && can_init_parents) { 4066 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4067 } 4068 } else { 4069 self->AssertNoPendingException(); 4070 } 4071 return success; 4072} 4073 4074void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 4075 mirror::Class* c, 4076 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 4077 const byte* class_data = dex_file.GetClassData(dex_class_def); 4078 ClassDataItemIterator it(dex_file, class_data); 4079 StackHandleScope<2> hs(Thread::Current()); 4080 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 4081 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 4082 CHECK(!kMovingFields); 4083 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 4084 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 4085 } 4086} 4087 4088void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4089 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4090 if (fields != nullptr) { 4091 for (int index = 0; index < fields->GetLength(); index ++) { 4092 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4093 fields->Get(index)->SetDeclaringClass(new_class); 4094 } 4095 } 4096 } 4097 4098 fields = new_class->GetSFields(); 4099 if (fields != nullptr) { 4100 for (int index = 0; index < fields->GetLength(); index ++) { 4101 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4102 fields->Get(index)->SetDeclaringClass(new_class); 4103 } 4104 } 4105 } 4106 4107 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4108 if (methods != nullptr) { 4109 for (int index = 0; index < methods->GetLength(); index ++) { 4110 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4111 methods->Get(index)->SetDeclaringClass(new_class); 4112 } 4113 } 4114 } 4115 4116 methods = new_class->GetVirtualMethods(); 4117 if (methods != nullptr) { 4118 for (int index = 0; index < methods->GetLength(); index ++) { 4119 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4120 methods->Get(index)->SetDeclaringClass(new_class); 4121 } 4122 } 4123 } 4124} 4125 4126bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4127 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4128 mirror::Class** new_class) { 4129 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4130 4131 if (!LinkSuperClass(klass)) { 4132 return false; 4133 } 4134 if (!LinkMethods(self, klass, interfaces)) { 4135 return false; 4136 } 4137 if (!LinkInstanceFields(klass)) { 4138 return false; 4139 } 4140 size_t class_size; 4141 if (!LinkStaticFields(klass, &class_size)) { 4142 return false; 4143 } 4144 CreateReferenceInstanceOffsets(klass); 4145 CreateReferenceStaticOffsets(klass); 4146 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4147 4148 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4149 // We don't need to retire this class as it has no embedded tables or it was created the 4150 // correct size during class linker initialization. 4151 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4152 4153 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4154 klass->PopulateEmbeddedImtAndVTable(); 4155 } 4156 4157 // This will notify waiters on klass that saw the not yet resolved 4158 // class in the class_table_ during EnsureResolved. 4159 klass->SetStatus(mirror::Class::kStatusResolved, self); 4160 *new_class = klass.Get(); 4161 } else { 4162 CHECK(!klass->IsResolved()); 4163 // Retire the temporary class and create the correctly sized resolved class. 4164 *new_class = klass->CopyOf(self, class_size); 4165 if (UNLIKELY(*new_class == NULL)) { 4166 CHECK(self->IsExceptionPending()); // Expect an OOME. 4167 klass->SetStatus(mirror::Class::kStatusError, self); 4168 return false; 4169 } 4170 4171 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4172 StackHandleScope<1> hs(self); 4173 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4174 ObjectLock<mirror::Class> lock(self, new_class_h); 4175 4176 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4177 4178 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4179 CHECK(existing == NULL || existing == klass.Get()); 4180 4181 // This will notify waiters on temp class that saw the not yet resolved class in the 4182 // class_table_ during EnsureResolved. 4183 klass->SetStatus(mirror::Class::kStatusRetired, self); 4184 4185 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4186 // This will notify waiters on new_class that saw the not yet resolved 4187 // class in the class_table_ during EnsureResolved. 4188 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4189 } 4190 return true; 4191} 4192 4193bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4194 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4195 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4196 uint16_t super_class_idx = class_def.superclass_idx_; 4197 if (super_class_idx != DexFile::kDexNoIndex16) { 4198 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4199 if (super_class == NULL) { 4200 DCHECK(Thread::Current()->IsExceptionPending()); 4201 return false; 4202 } 4203 // Verify 4204 if (!klass->CanAccess(super_class)) { 4205 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4206 PrettyDescriptor(super_class).c_str(), 4207 PrettyDescriptor(klass.Get()).c_str()); 4208 return false; 4209 } 4210 CHECK(super_class->IsResolved()); 4211 klass->SetSuperClass(super_class); 4212 } 4213 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4214 if (interfaces != NULL) { 4215 for (size_t i = 0; i < interfaces->Size(); i++) { 4216 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4217 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4218 if (interface == NULL) { 4219 DCHECK(Thread::Current()->IsExceptionPending()); 4220 return false; 4221 } 4222 // Verify 4223 if (!klass->CanAccess(interface)) { 4224 // TODO: the RI seemed to ignore this in my testing. 4225 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4226 PrettyDescriptor(interface).c_str(), 4227 PrettyDescriptor(klass.Get()).c_str()); 4228 return false; 4229 } 4230 } 4231 } 4232 // Mark the class as loaded. 4233 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 4234 return true; 4235} 4236 4237bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4238 CHECK(!klass->IsPrimitive()); 4239 mirror::Class* super = klass->GetSuperClass(); 4240 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4241 if (super != NULL) { 4242 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4243 return false; 4244 } 4245 return true; 4246 } 4247 if (super == NULL) { 4248 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4249 PrettyDescriptor(klass.Get()).c_str()); 4250 return false; 4251 } 4252 // Verify 4253 if (super->IsFinal() || super->IsInterface()) { 4254 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4255 PrettyDescriptor(super).c_str(), 4256 PrettyDescriptor(klass.Get()).c_str(), 4257 super->IsFinal() ? "declared final" : "an interface"); 4258 return false; 4259 } 4260 if (!klass->CanAccess(super)) { 4261 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4262 PrettyDescriptor(super).c_str(), 4263 PrettyDescriptor(klass.Get()).c_str()); 4264 return false; 4265 } 4266 4267 // Inherit kAccClassIsFinalizable from the superclass in case this 4268 // class doesn't override finalize. 4269 if (super->IsFinalizable()) { 4270 klass->SetFinalizable(); 4271 } 4272 4273 // Inherit reference flags (if any) from the superclass. 4274 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4275 if (reference_flags != 0) { 4276 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4277 } 4278 // Disallow custom direct subclasses of java.lang.ref.Reference. 4279 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4280 ThrowLinkageError(klass.Get(), 4281 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4282 PrettyDescriptor(klass.Get()).c_str()); 4283 return false; 4284 } 4285 4286 if (kIsDebugBuild) { 4287 // Ensure super classes are fully resolved prior to resolving fields.. 4288 while (super != NULL) { 4289 CHECK(super->IsResolved()); 4290 super = super->GetSuperClass(); 4291 } 4292 } 4293 return true; 4294} 4295 4296// Populate the class vtable and itable. Compute return type indices. 4297bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4298 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4299 if (klass->IsInterface()) { 4300 // No vtable. 4301 size_t count = klass->NumVirtualMethods(); 4302 if (!IsUint(16, count)) { 4303 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4304 return false; 4305 } 4306 for (size_t i = 0; i < count; ++i) { 4307 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4308 } 4309 // Link interface method tables 4310 return LinkInterfaceMethods(klass, interfaces); 4311 } else { 4312 // Link virtual and interface method tables 4313 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4314 } 4315 return true; 4316} 4317 4318bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4319 if (klass->HasSuperClass()) { 4320 uint32_t max_count = klass->NumVirtualMethods() + 4321 klass->GetSuperClass()->GetVTableLength(); 4322 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4323 CHECK_LE(actual_count, max_count); 4324 StackHandleScope<4> hs(self); 4325 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4326 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4327 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4328 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4329 if (UNLIKELY(vtable.Get() == nullptr)) { 4330 CHECK(self->IsExceptionPending()); // OOME. 4331 return false; 4332 } 4333 int len = super_class->GetVTableLength(); 4334 for (int i = 0; i < len; i++) { 4335 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4336 } 4337 } else { 4338 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4339 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4340 if (UNLIKELY(vtable.Get() == nullptr)) { 4341 CHECK(self->IsExceptionPending()); // OOME. 4342 return false; 4343 } 4344 } 4345 4346 // See if any of our virtual methods override the superclass. 4347 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4348 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4349 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4350 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4351 local_mh.ChangeMethod(local_method); 4352 size_t j = 0; 4353 for (; j < actual_count; ++j) { 4354 mirror::ArtMethod* super_method = vtable->Get(j); 4355 super_mh.ChangeMethod(super_method); 4356 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4357 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4358 super_method->GetAccessFlags())) { 4359 if (super_method->IsFinal()) { 4360 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4361 PrettyMethod(local_method).c_str(), 4362 super_method->GetDeclaringClassDescriptor()); 4363 return false; 4364 } 4365 vtable->Set<false>(j, local_method); 4366 local_method->SetMethodIndex(j); 4367 break; 4368 } else { 4369 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4370 << " would have incorrectly overridden the package-private method in " 4371 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4372 } 4373 } 4374 } 4375 if (j == actual_count) { 4376 // Not overriding, append. 4377 vtable->Set<false>(actual_count, local_method); 4378 local_method->SetMethodIndex(actual_count); 4379 actual_count += 1; 4380 } 4381 } 4382 if (!IsUint(16, actual_count)) { 4383 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4384 return false; 4385 } 4386 // Shrink vtable if possible 4387 CHECK_LE(actual_count, max_count); 4388 if (actual_count < max_count) { 4389 vtable.Assign(vtable->CopyOf(self, actual_count)); 4390 if (UNLIKELY(vtable.Get() == NULL)) { 4391 CHECK(self->IsExceptionPending()); // OOME. 4392 return false; 4393 } 4394 } 4395 klass->SetVTable(vtable.Get()); 4396 } else { 4397 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4398 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4399 if (!IsUint(16, num_virtual_methods)) { 4400 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4401 return false; 4402 } 4403 StackHandleScope<1> hs(self); 4404 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4405 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4406 if (UNLIKELY(vtable.Get() == NULL)) { 4407 CHECK(self->IsExceptionPending()); // OOME. 4408 return false; 4409 } 4410 for (size_t i = 0; i < num_virtual_methods; ++i) { 4411 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4412 vtable->Set<false>(i, virtual_method); 4413 virtual_method->SetMethodIndex(i & 0xFFFF); 4414 } 4415 klass->SetVTable(vtable.Get()); 4416 } 4417 return true; 4418} 4419 4420bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 4421 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4422 Thread* const self = Thread::Current(); 4423 Runtime* const runtime = Runtime::Current(); 4424 // Set the imt table to be all conflicts by default. 4425 klass->SetImTable(runtime->GetDefaultImt()); 4426 size_t super_ifcount; 4427 if (klass->HasSuperClass()) { 4428 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4429 } else { 4430 super_ifcount = 0; 4431 } 4432 uint32_t num_interfaces = 4433 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4434 size_t ifcount = super_ifcount + num_interfaces; 4435 for (size_t i = 0; i < num_interfaces; i++) { 4436 mirror::Class* interface = 4437 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4438 interfaces->Get(i); 4439 ifcount += interface->GetIfTableCount(); 4440 } 4441 if (ifcount == 0) { 4442 // Class implements no interfaces. 4443 DCHECK_EQ(klass->GetIfTableCount(), 0); 4444 DCHECK(klass->GetIfTable() == NULL); 4445 return true; 4446 } 4447 if (ifcount == super_ifcount) { 4448 // Class implements same interfaces as parent, are any of these not marker interfaces? 4449 bool has_non_marker_interface = false; 4450 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4451 for (size_t i = 0; i < ifcount; ++i) { 4452 if (super_iftable->GetMethodArrayCount(i) > 0) { 4453 has_non_marker_interface = true; 4454 break; 4455 } 4456 } 4457 if (!has_non_marker_interface) { 4458 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4459 klass->SetIfTable(super_iftable); 4460 return true; 4461 } 4462 } 4463 StackHandleScope<4> hs(self); 4464 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4465 if (UNLIKELY(iftable.Get() == NULL)) { 4466 CHECK(self->IsExceptionPending()); // OOME. 4467 return false; 4468 } 4469 if (super_ifcount != 0) { 4470 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4471 for (size_t i = 0; i < super_ifcount; i++) { 4472 mirror::Class* super_interface = super_iftable->GetInterface(i); 4473 iftable->SetInterface(i, super_interface); 4474 } 4475 } 4476 // Flatten the interface inheritance hierarchy. 4477 size_t idx = super_ifcount; 4478 for (size_t i = 0; i < num_interfaces; i++) { 4479 mirror::Class* interface = 4480 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4481 interfaces->Get(i); 4482 DCHECK(interface != NULL); 4483 if (!interface->IsInterface()) { 4484 std::string temp; 4485 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4486 PrettyDescriptor(klass.Get()).c_str(), 4487 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4488 return false; 4489 } 4490 // Check if interface is already in iftable 4491 bool duplicate = false; 4492 for (size_t j = 0; j < idx; j++) { 4493 mirror::Class* existing_interface = iftable->GetInterface(j); 4494 if (existing_interface == interface) { 4495 duplicate = true; 4496 break; 4497 } 4498 } 4499 if (!duplicate) { 4500 // Add this non-duplicate interface. 4501 iftable->SetInterface(idx++, interface); 4502 // Add this interface's non-duplicate super-interfaces. 4503 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4504 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4505 bool super_duplicate = false; 4506 for (size_t k = 0; k < idx; k++) { 4507 mirror::Class* existing_interface = iftable->GetInterface(k); 4508 if (existing_interface == super_interface) { 4509 super_duplicate = true; 4510 break; 4511 } 4512 } 4513 if (!super_duplicate) { 4514 iftable->SetInterface(idx++, super_interface); 4515 } 4516 } 4517 } 4518 } 4519 // Shrink iftable in case duplicates were found 4520 if (idx < ifcount) { 4521 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4522 if (UNLIKELY(iftable.Get() == NULL)) { 4523 CHECK(self->IsExceptionPending()); // OOME. 4524 return false; 4525 } 4526 ifcount = idx; 4527 } else { 4528 CHECK_EQ(idx, ifcount); 4529 } 4530 klass->SetIfTable(iftable.Get()); 4531 4532 // If we're an interface, we don't need the vtable pointers, so we're done. 4533 if (klass->IsInterface()) { 4534 return true; 4535 } 4536 // Allocate imtable 4537 bool imtable_changed = false; 4538 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4539 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4540 if (UNLIKELY(imtable.Get() == NULL)) { 4541 CHECK(self->IsExceptionPending()); // OOME. 4542 return false; 4543 } 4544 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4545 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4546 std::vector<mirror::ArtMethod*> miranda_list; 4547 for (size_t i = 0; i < ifcount; ++i) { 4548 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4549 if (num_methods > 0) { 4550 StackHandleScope<2> hs(self); 4551 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4552 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4553 if (UNLIKELY(method_array.Get() == nullptr)) { 4554 CHECK(self->IsExceptionPending()); // OOME. 4555 return false; 4556 } 4557 iftable->SetMethodArray(i, method_array.Get()); 4558 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4559 hs.NewHandle(klass->GetVTableDuringLinking())); 4560 for (size_t j = 0; j < num_methods; ++j) { 4561 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 4562 interface_mh.ChangeMethod(interface_method); 4563 int32_t k; 4564 // For each method listed in the interface's method list, find the 4565 // matching method in our class's method list. We want to favor the 4566 // subclass over the superclass, which just requires walking 4567 // back from the end of the vtable. (This only matters if the 4568 // superclass defines a private method and this class redefines 4569 // it -- otherwise it would use the same vtable slot. In .dex files 4570 // those don't end up in the virtual method table, so it shouldn't 4571 // matter which direction we go. We walk it backward anyway.) 4572 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4573 mirror::ArtMethod* vtable_method = vtable->Get(k); 4574 vtable_mh.ChangeMethod(vtable_method); 4575 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4576 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 4577 ThrowIllegalAccessError( 4578 klass.Get(), 4579 "Method '%s' implementing interface method '%s' is not public", 4580 PrettyMethod(vtable_method).c_str(), 4581 PrettyMethod(interface_method).c_str()); 4582 return false; 4583 } 4584 method_array->Set<false>(j, vtable_method); 4585 // Place method in imt if entry is empty, place conflict otherwise. 4586 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4587 if (imtable->Get(imt_index) == NULL) { 4588 imtable->Set<false>(imt_index, vtable_method); 4589 imtable_changed = true; 4590 } else { 4591 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4592 } 4593 break; 4594 } 4595 } 4596 if (k < 0) { 4597 StackHandleScope<1> hs(self); 4598 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4599 for (mirror::ArtMethod* mir_method : miranda_list) { 4600 vtable_mh.ChangeMethod(mir_method); 4601 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4602 miranda_method.Assign(mir_method); 4603 break; 4604 } 4605 } 4606 if (miranda_method.Get() == NULL) { 4607 // Point the interface table at a phantom slot. 4608 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 4609 if (UNLIKELY(miranda_method.Get() == NULL)) { 4610 CHECK(self->IsExceptionPending()); // OOME. 4611 return false; 4612 } 4613 // TODO: If a methods move then the miranda_list may hold stale references. 4614 miranda_list.push_back(miranda_method.Get()); 4615 } 4616 method_array->Set<false>(j, miranda_method.Get()); 4617 } 4618 } 4619 } 4620 } 4621 if (imtable_changed) { 4622 // Fill in empty entries in interface method table with conflict. 4623 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4624 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4625 if (imtable->Get(i) == NULL) { 4626 imtable->Set<false>(i, imt_conflict_method); 4627 } 4628 } 4629 klass->SetImTable(imtable.Get()); 4630 } 4631 if (!miranda_list.empty()) { 4632 int old_method_count = klass->NumVirtualMethods(); 4633 int new_method_count = old_method_count + miranda_list.size(); 4634 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4635 if (old_method_count == 0) { 4636 virtuals = AllocArtMethodArray(self, new_method_count); 4637 } else { 4638 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4639 } 4640 if (UNLIKELY(virtuals == NULL)) { 4641 CHECK(self->IsExceptionPending()); // OOME. 4642 return false; 4643 } 4644 klass->SetVirtualMethods(virtuals); 4645 4646 StackHandleScope<1> hs(self); 4647 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4648 hs.NewHandle(klass->GetVTableDuringLinking())); 4649 CHECK(vtable.Get() != NULL); 4650 int old_vtable_count = vtable->GetLength(); 4651 int new_vtable_count = old_vtable_count + miranda_list.size(); 4652 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4653 if (UNLIKELY(vtable.Get() == NULL)) { 4654 CHECK(self->IsExceptionPending()); // OOME. 4655 return false; 4656 } 4657 for (size_t i = 0; i < miranda_list.size(); ++i) { 4658 mirror::ArtMethod* method = miranda_list[i]; 4659 // Leave the declaring class alone as type indices are relative to it 4660 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4661 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4662 klass->SetVirtualMethod(old_method_count + i, method); 4663 vtable->Set<false>(old_vtable_count + i, method); 4664 } 4665 // TODO: do not assign to the vtable field until it is fully constructed. 4666 klass->SetVTable(vtable.Get()); 4667 } 4668 4669 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4670 for (int i = 0; i < vtable->GetLength(); ++i) { 4671 CHECK(vtable->Get(i) != NULL); 4672 } 4673 4674// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4675 4676 return true; 4677} 4678 4679bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4680 CHECK(klass.Get() != NULL); 4681 return LinkFields(klass, false, nullptr); 4682} 4683 4684bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass, size_t* class_size) { 4685 CHECK(klass.Get() != NULL); 4686 return LinkFields(klass, true, class_size); 4687} 4688 4689struct LinkFieldsComparator { 4690 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4691 } 4692 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4693 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4694 NO_THREAD_SAFETY_ANALYSIS { 4695 // First come reference fields, then 64-bit, and finally 32-bit 4696 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4697 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4698 if (type1 != type2) { 4699 bool is_primitive1 = type1 != Primitive::kPrimNot; 4700 bool is_primitive2 = type2 != Primitive::kPrimNot; 4701 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4702 type1 == Primitive::kPrimDouble); 4703 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4704 type2 == Primitive::kPrimDouble); 4705 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4706 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4707 if (order1 != order2) { 4708 return order1 < order2; 4709 } 4710 } 4711 // same basic group? then sort by string. 4712 return strcmp(field1->GetName(), field2->GetName()) < 0; 4713 } 4714}; 4715 4716bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static, size_t* class_size) { 4717 size_t num_fields = 4718 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4719 4720 mirror::ObjectArray<mirror::ArtField>* fields = 4721 is_static ? klass->GetSFields() : klass->GetIFields(); 4722 4723 // Initialize field_offset 4724 MemberOffset field_offset(0); 4725 if (is_static) { 4726 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 4727 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4728 // Static fields come after the embedded tables. 4729 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 4730 0, 0, 0); 4731 } 4732 field_offset = MemberOffset(base); 4733 } else { 4734 mirror::Class* super_class = klass->GetSuperClass(); 4735 if (super_class != NULL) { 4736 CHECK(super_class->IsResolved()) 4737 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4738 field_offset = MemberOffset(super_class->GetObjectSize()); 4739 } 4740 } 4741 4742 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4743 4744 // we want a relatively stable order so that adding new fields 4745 // minimizes disruption of C++ version such as Class and Method. 4746 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4747 for (size_t i = 0; i < num_fields; i++) { 4748 mirror::ArtField* f = fields->Get(i); 4749 CHECK(f != NULL) << PrettyClass(klass.Get()); 4750 grouped_and_sorted_fields.push_back(f); 4751 } 4752 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4753 LinkFieldsComparator()); 4754 4755 // References should be at the front. 4756 size_t current_field = 0; 4757 size_t num_reference_fields = 0; 4758 for (; current_field < num_fields; current_field++) { 4759 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4760 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4761 bool isPrimitive = type != Primitive::kPrimNot; 4762 if (isPrimitive) { 4763 break; // past last reference, move on to the next phase 4764 } 4765 grouped_and_sorted_fields.pop_front(); 4766 num_reference_fields++; 4767 fields->Set<false>(current_field, field); 4768 field->SetOffset(field_offset); 4769 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4770 } 4771 4772 // Now we want to pack all of the double-wide fields together. If 4773 // we're not aligned, though, we want to shuffle one 32-bit field 4774 // into place. If we can't find one, we'll have to pad it. 4775 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4776 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4777 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4778 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4779 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4780 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4781 continue; 4782 } 4783 fields->Set<false>(current_field++, field); 4784 field->SetOffset(field_offset); 4785 // drop the consumed field 4786 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4787 break; 4788 } 4789 // whether we found a 32-bit field for padding or not, we advance 4790 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4791 } 4792 4793 // Alignment is good, shuffle any double-wide fields forward, and 4794 // finish assigning field offsets to all fields. 4795 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 4796 << PrettyClass(klass.Get()); 4797 while (!grouped_and_sorted_fields.empty()) { 4798 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4799 grouped_and_sorted_fields.pop_front(); 4800 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4801 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4802 fields->Set<false>(current_field, field); 4803 field->SetOffset(field_offset); 4804 field_offset = MemberOffset(field_offset.Uint32Value() + 4805 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4806 ? sizeof(uint64_t) 4807 : sizeof(uint32_t))); 4808 current_field++; 4809 } 4810 4811 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4812 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4813 // We know there are no non-reference fields in the Reference classes, and we know 4814 // that 'referent' is alphabetically last, so this is easy... 4815 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4816 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4817 --num_reference_fields; 4818 } 4819 4820 if (kIsDebugBuild) { 4821 // Make sure that all reference fields appear before 4822 // non-reference fields, and all double-wide fields are aligned. 4823 bool seen_non_ref = false; 4824 for (size_t i = 0; i < num_fields; i++) { 4825 mirror::ArtField* field = fields->Get(i); 4826 if (false) { // enable to debug field layout 4827 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4828 << " class=" << PrettyClass(klass.Get()) 4829 << " field=" << PrettyField(field) 4830 << " offset=" 4831 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4832 } 4833 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4834 bool is_primitive = type != Primitive::kPrimNot; 4835 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4836 strcmp("referent", field->GetName()) == 0) { 4837 is_primitive = true; // We lied above, so we have to expect a lie here. 4838 } 4839 if (is_primitive) { 4840 if (!seen_non_ref) { 4841 seen_non_ref = true; 4842 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4843 } 4844 } else { 4845 DCHECK(!seen_non_ref) << PrettyField(field); 4846 } 4847 } 4848 if (!seen_non_ref) { 4849 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4850 } 4851 } 4852 4853 size_t size = field_offset.Uint32Value(); 4854 // Update klass 4855 if (is_static) { 4856 klass->SetNumReferenceStaticFields(num_reference_fields); 4857 *class_size = size; 4858 } else { 4859 klass->SetNumReferenceInstanceFields(num_reference_fields); 4860 if (!klass->IsVariableSize()) { 4861 std::string temp; 4862 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 4863 size_t previous_size = klass->GetObjectSize(); 4864 if (previous_size != 0) { 4865 // Make sure that we didn't originally have an incorrect size. 4866 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 4867 } 4868 klass->SetObjectSize(size); 4869 } 4870 } 4871 return true; 4872} 4873 4874// Set the bitmap of reference offsets, refOffsets, from the ifields 4875// list. 4876void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4877 uint32_t reference_offsets = 0; 4878 mirror::Class* super_class = klass->GetSuperClass(); 4879 if (super_class != NULL) { 4880 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4881 // If our superclass overflowed, we don't stand a chance. 4882 if (reference_offsets == CLASS_WALK_SUPER) { 4883 klass->SetReferenceInstanceOffsets(reference_offsets); 4884 return; 4885 } 4886 } 4887 CreateReferenceOffsets(klass, false, reference_offsets); 4888} 4889 4890void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4891 CreateReferenceOffsets(klass, true, 0); 4892} 4893 4894void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4895 uint32_t reference_offsets) { 4896 size_t num_reference_fields = 4897 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4898 : klass->NumReferenceInstanceFieldsDuringLinking(); 4899 mirror::ObjectArray<mirror::ArtField>* fields = 4900 is_static ? klass->GetSFields() : klass->GetIFields(); 4901 // All of the fields that contain object references are guaranteed 4902 // to be at the beginning of the fields list. 4903 for (size_t i = 0; i < num_reference_fields; ++i) { 4904 // Note that byte_offset is the offset from the beginning of 4905 // object, not the offset into instance data 4906 mirror::ArtField* field = fields->Get(i); 4907 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4908 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4909 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4910 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4911 CHECK_NE(new_bit, 0U); 4912 reference_offsets |= new_bit; 4913 } else { 4914 reference_offsets = CLASS_WALK_SUPER; 4915 break; 4916 } 4917 } 4918 // Update fields in klass 4919 if (is_static) { 4920 klass->SetReferenceStaticOffsets(reference_offsets); 4921 } else { 4922 klass->SetReferenceInstanceOffsets(reference_offsets); 4923 } 4924} 4925 4926mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4927 Handle<mirror::DexCache> dex_cache) { 4928 DCHECK(dex_cache.Get() != nullptr); 4929 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4930 if (resolved != NULL) { 4931 return resolved; 4932 } 4933 uint32_t utf16_length; 4934 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4935 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4936 dex_cache->SetResolvedString(string_idx, string); 4937 return string; 4938} 4939 4940mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4941 mirror::Class* referrer) { 4942 StackHandleScope<2> hs(Thread::Current()); 4943 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4944 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4945 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4946} 4947 4948mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4949 Handle<mirror::DexCache> dex_cache, 4950 Handle<mirror::ClassLoader> class_loader) { 4951 DCHECK(dex_cache.Get() != NULL); 4952 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4953 if (resolved == NULL) { 4954 Thread* self = Thread::Current(); 4955 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4956 resolved = FindClass(self, descriptor, class_loader); 4957 if (resolved != NULL) { 4958 // TODO: we used to throw here if resolved's class loader was not the 4959 // boot class loader. This was to permit different classes with the 4960 // same name to be loaded simultaneously by different loaders 4961 dex_cache->SetResolvedType(type_idx, resolved); 4962 } else { 4963 CHECK(self->IsExceptionPending()) 4964 << "Expected pending exception for failed resolution of: " << descriptor; 4965 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4966 StackHandleScope<1> hs(self); 4967 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4968 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4969 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4970 self->ClearException(); 4971 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4972 self->GetException(NULL)->SetCause(cause.Get()); 4973 } 4974 } 4975 } 4976 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4977 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4978 return resolved; 4979} 4980 4981mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 4982 Handle<mirror::DexCache> dex_cache, 4983 Handle<mirror::ClassLoader> class_loader, 4984 Handle<mirror::ArtMethod> referrer, 4985 InvokeType type) { 4986 DCHECK(dex_cache.Get() != nullptr); 4987 // Check for hit in the dex cache. 4988 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4989 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 4990 return resolved; 4991 } 4992 // Fail, get the declaring class. 4993 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4994 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4995 if (klass == nullptr) { 4996 DCHECK(Thread::Current()->IsExceptionPending()); 4997 return nullptr; 4998 } 4999 // Scan using method_idx, this saves string compares but will only hit for matching dex 5000 // caches/files. 5001 switch (type) { 5002 case kDirect: // Fall-through. 5003 case kStatic: 5004 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5005 break; 5006 case kInterface: 5007 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5008 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5009 break; 5010 case kSuper: // Fall-through. 5011 case kVirtual: 5012 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5013 break; 5014 default: 5015 LOG(FATAL) << "Unreachable - invocation type: " << type; 5016 } 5017 if (resolved == nullptr) { 5018 // Search by name, which works across dex files. 5019 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5020 const Signature signature = dex_file.GetMethodSignature(method_id); 5021 switch (type) { 5022 case kDirect: // Fall-through. 5023 case kStatic: 5024 resolved = klass->FindDirectMethod(name, signature); 5025 break; 5026 case kInterface: 5027 resolved = klass->FindInterfaceMethod(name, signature); 5028 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5029 break; 5030 case kSuper: // Fall-through. 5031 case kVirtual: 5032 resolved = klass->FindVirtualMethod(name, signature); 5033 break; 5034 } 5035 } 5036 // If we found a method, check for incompatible class changes. 5037 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5038 // Be a good citizen and update the dex cache to speed subsequent calls. 5039 dex_cache->SetResolvedMethod(method_idx, resolved); 5040 return resolved; 5041 } else { 5042 // If we had a method, it's an incompatible-class-change error. 5043 if (resolved != nullptr) { 5044 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5045 } else { 5046 // We failed to find the method which means either an access error, an incompatible class 5047 // change, or no such method. First try to find the method among direct and virtual methods. 5048 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5049 const Signature signature = dex_file.GetMethodSignature(method_id); 5050 switch (type) { 5051 case kDirect: 5052 case kStatic: 5053 resolved = klass->FindVirtualMethod(name, signature); 5054 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5055 // have had a resolved method before, which triggers the "true" branch above. 5056 break; 5057 case kInterface: 5058 case kVirtual: 5059 case kSuper: 5060 resolved = klass->FindDirectMethod(name, signature); 5061 break; 5062 } 5063 5064 // If we found something, check that it can be accessed by the referrer. 5065 if (resolved != nullptr && referrer.Get() != nullptr) { 5066 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5067 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5068 if (!referring_class->CanAccess(methods_class)) { 5069 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5070 resolved, type); 5071 return nullptr; 5072 } else if (!referring_class->CanAccessMember(methods_class, 5073 resolved->GetAccessFlags())) { 5074 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5075 return nullptr; 5076 } 5077 } 5078 5079 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 5080 // methods and throw if we find the method there. If we find nothing, throw a 5081 // NoSuchMethodError. 5082 switch (type) { 5083 case kDirect: 5084 case kStatic: 5085 if (resolved != nullptr) { 5086 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5087 } else { 5088 resolved = klass->FindInterfaceMethod(name, signature); 5089 if (resolved != nullptr) { 5090 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5091 } else { 5092 ThrowNoSuchMethodError(type, klass, name, signature); 5093 } 5094 } 5095 break; 5096 case kInterface: 5097 if (resolved != nullptr) { 5098 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5099 } else { 5100 resolved = klass->FindVirtualMethod(name, signature); 5101 if (resolved != nullptr) { 5102 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5103 } else { 5104 ThrowNoSuchMethodError(type, klass, name, signature); 5105 } 5106 } 5107 break; 5108 case kSuper: 5109 if (resolved != nullptr) { 5110 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5111 } else { 5112 ThrowNoSuchMethodError(type, klass, name, signature); 5113 } 5114 break; 5115 case kVirtual: 5116 if (resolved != nullptr) { 5117 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5118 } else { 5119 resolved = klass->FindInterfaceMethod(name, signature); 5120 if (resolved != nullptr) { 5121 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5122 } else { 5123 ThrowNoSuchMethodError(type, klass, name, signature); 5124 } 5125 } 5126 break; 5127 } 5128 } 5129 DCHECK(Thread::Current()->IsExceptionPending()); 5130 return nullptr; 5131 } 5132} 5133 5134mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5135 Handle<mirror::DexCache> dex_cache, 5136 Handle<mirror::ClassLoader> class_loader, 5137 bool is_static) { 5138 DCHECK(dex_cache.Get() != nullptr); 5139 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5140 if (resolved != nullptr) { 5141 return resolved; 5142 } 5143 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5144 Thread* const self = Thread::Current(); 5145 StackHandleScope<1> hs(self); 5146 Handle<mirror::Class> klass( 5147 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5148 if (klass.Get() == nullptr) { 5149 DCHECK(Thread::Current()->IsExceptionPending()); 5150 return nullptr; 5151 } 5152 5153 if (is_static) { 5154 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5155 } else { 5156 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5157 } 5158 5159 if (resolved == nullptr) { 5160 const char* name = dex_file.GetFieldName(field_id); 5161 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5162 if (is_static) { 5163 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5164 } else { 5165 resolved = klass->FindInstanceField(name, type); 5166 } 5167 if (resolved == nullptr) { 5168 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5169 return NULL; 5170 } 5171 } 5172 dex_cache->SetResolvedField(field_idx, resolved); 5173 return resolved; 5174} 5175 5176mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5177 uint32_t field_idx, 5178 Handle<mirror::DexCache> dex_cache, 5179 Handle<mirror::ClassLoader> class_loader) { 5180 DCHECK(dex_cache.Get() != nullptr); 5181 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5182 if (resolved != nullptr) { 5183 return resolved; 5184 } 5185 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5186 Thread* self = Thread::Current(); 5187 StackHandleScope<1> hs(self); 5188 Handle<mirror::Class> klass( 5189 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5190 if (klass.Get() == NULL) { 5191 DCHECK(Thread::Current()->IsExceptionPending()); 5192 return NULL; 5193 } 5194 5195 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5196 StringPiece type(dex_file.StringDataByIdx( 5197 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5198 resolved = mirror::Class::FindField(self, klass, name, type); 5199 if (resolved != NULL) { 5200 dex_cache->SetResolvedField(field_idx, resolved); 5201 } else { 5202 ThrowNoSuchFieldError("", klass.Get(), type, name); 5203 } 5204 return resolved; 5205} 5206 5207const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5208 uint32_t* length) { 5209 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5210 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5211 const DexFile& dex_file = *dex_cache->GetDexFile(); 5212 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5213 return dex_file.GetMethodShorty(method_id, length); 5214} 5215 5216void ClassLinker::DumpAllClasses(int flags) { 5217 if (dex_cache_image_class_lookup_required_) { 5218 MoveImageClassesToClassTable(); 5219 } 5220 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5221 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5222 std::vector<mirror::Class*> all_classes; 5223 { 5224 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5225 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5226 mirror::Class* klass = it.second.Read(); 5227 all_classes.push_back(klass); 5228 } 5229 } 5230 5231 for (size_t i = 0; i < all_classes.size(); ++i) { 5232 all_classes[i]->DumpClass(std::cerr, flags); 5233 } 5234} 5235 5236void ClassLinker::DumpForSigQuit(std::ostream& os) { 5237 if (dex_cache_image_class_lookup_required_) { 5238 MoveImageClassesToClassTable(); 5239 } 5240 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5241 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5242} 5243 5244size_t ClassLinker::NumLoadedClasses() { 5245 if (dex_cache_image_class_lookup_required_) { 5246 MoveImageClassesToClassTable(); 5247 } 5248 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5249 return class_table_.size(); 5250} 5251 5252pid_t ClassLinker::GetClassesLockOwner() { 5253 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5254} 5255 5256pid_t ClassLinker::GetDexLockOwner() { 5257 return dex_lock_.GetExclusiveOwnerTid(); 5258} 5259 5260void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5261 DCHECK(!init_done_); 5262 5263 DCHECK(klass != NULL); 5264 DCHECK(klass->GetClassLoader() == NULL); 5265 5266 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5267 DCHECK(class_roots != NULL); 5268 DCHECK(class_roots->Get(class_root) == NULL); 5269 class_roots->Set<false>(class_root, klass); 5270} 5271 5272} // namespace art 5273