class_linker.cc revision 7989d22642415e1e4d608e210284834951bd0a39
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() != nullptr) { 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() != nullptr); 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;", 127 nullptr); 128 } 129} 130 131static size_t Hash(const char* s) { 132 // This is the java.lang.String hashcode for convenience, not interoperability. 133 size_t hash = 0; 134 for (; *s != '\0'; ++s) { 135 hash = hash * 31 + *s; 136 } 137 return hash; 138} 139 140const char* ClassLinker::class_roots_descriptors_[] = { 141 "Ljava/lang/Class;", 142 "Ljava/lang/Object;", 143 "[Ljava/lang/Class;", 144 "[Ljava/lang/Object;", 145 "Ljava/lang/String;", 146 "Ljava/lang/DexCache;", 147 "Ljava/lang/ref/Reference;", 148 "Ljava/lang/reflect/ArtField;", 149 "Ljava/lang/reflect/ArtMethod;", 150 "Ljava/lang/reflect/Proxy;", 151 "[Ljava/lang/String;", 152 "[Ljava/lang/reflect/ArtField;", 153 "[Ljava/lang/reflect/ArtMethod;", 154 "Ljava/lang/ClassLoader;", 155 "Ljava/lang/Throwable;", 156 "Ljava/lang/ClassNotFoundException;", 157 "Ljava/lang/StackTraceElement;", 158 "Z", 159 "B", 160 "C", 161 "D", 162 "F", 163 "I", 164 "J", 165 "S", 166 "V", 167 "[Z", 168 "[B", 169 "[C", 170 "[D", 171 "[F", 172 "[I", 173 "[J", 174 "[S", 175 "[Ljava/lang/StackTraceElement;", 176}; 177 178ClassLinker::ClassLinker(InternTable* intern_table) 179 // dex_lock_ is recursive as it may be used in stack dumping. 180 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 181 dex_cache_image_class_lookup_required_(false), 182 failed_dex_cache_class_lookups_(0), 183 class_roots_(nullptr), 184 array_iftable_(nullptr), 185 find_array_class_cache_next_victim_(0), 186 init_done_(false), 187 log_new_dex_caches_roots_(false), 188 log_new_class_table_roots_(false), 189 intern_table_(intern_table), 190 portable_resolution_trampoline_(nullptr), 191 quick_resolution_trampoline_(nullptr), 192 portable_imt_conflict_trampoline_(nullptr), 193 quick_imt_conflict_trampoline_(nullptr), 194 quick_generic_jni_trampoline_(nullptr), 195 quick_to_interpreter_bridge_trampoline_(nullptr) { 196 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 197 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 198} 199 200// To set a value for generic JNI. May be necessary in compiler tests. 201extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 202extern "C" void art_quick_resolution_trampoline(mirror::ArtMethod*); 203extern "C" void art_quick_imt_conflict_trampoline(mirror::ArtMethod*); 204extern "C" void art_quick_to_interpreter_bridge(mirror::ArtMethod*); 205 206void ClassLinker::InitWithoutImage(const std::vector<const DexFile*>& boot_class_path) { 207 VLOG(startup) << "ClassLinker::Init"; 208 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 209 210 CHECK(!init_done_); 211 212 // java_lang_Class comes first, it's needed for AllocClass 213 Thread* self = Thread::Current(); 214 gc::Heap* heap = Runtime::Current()->GetHeap(); 215 // The GC can't handle an object with a null class since we can't get the size of this object. 216 heap->IncrementDisableMovingGC(self); 217 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 218 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 219 heap->AllocNonMovableObject<true>(self, nullptr, 220 mirror::Class::ClassClassSize(), 221 VoidFunctor())))); 222 CHECK(java_lang_Class.Get() != nullptr); 223 mirror::Class::SetClassClass(java_lang_Class.Get()); 224 java_lang_Class->SetClass(java_lang_Class.Get()); 225 if (kUseBakerOrBrooksReadBarrier) { 226 java_lang_Class->AssertReadBarrierPointer(); 227 } 228 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 229 heap->DecrementDisableMovingGC(self); 230 // AllocClass(mirror::Class*) can now be used 231 232 // Class[] is used for reflection support. 233 Handle<mirror::Class> class_array_class(hs.NewHandle( 234 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 235 class_array_class->SetComponentType(java_lang_Class.Get()); 236 237 // java_lang_Object comes next so that object_array_class can be created. 238 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 239 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 240 CHECK(java_lang_Object.Get() != nullptr); 241 // backfill Object as the super class of Class. 242 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 243 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 244 245 // Object[] next to hold class roots. 246 Handle<mirror::Class> object_array_class(hs.NewHandle( 247 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 248 object_array_class->SetComponentType(java_lang_Object.Get()); 249 250 // Setup the char (primitive) class to be used for char[]. 251 Handle<mirror::Class> char_class(hs.NewHandle( 252 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 253 254 // Setup the char[] class to be used for String. 255 Handle<mirror::Class> char_array_class(hs.NewHandle( 256 AllocClass(self, java_lang_Class.Get(), 257 mirror::Array::ClassSize()))); 258 char_array_class->SetComponentType(char_class.Get()); 259 mirror::CharArray::SetArrayClass(char_array_class.Get()); 260 261 // Setup String. 262 Handle<mirror::Class> java_lang_String(hs.NewHandle( 263 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 264 mirror::String::SetClass(java_lang_String.Get()); 265 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 266 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 267 268 // Setup Reference. 269 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 270 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 271 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 272 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 273 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 274 275 // Create storage for root classes, save away our work so far (requires descriptors). 276 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 277 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 278 kClassRootsMax)); 279 CHECK(!class_roots_.IsNull()); 280 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 281 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 282 SetClassRoot(kClassArrayClass, class_array_class.Get()); 283 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 284 SetClassRoot(kCharArrayClass, char_array_class.Get()); 285 SetClassRoot(kJavaLangString, java_lang_String.Get()); 286 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 287 288 // Setup the primitive type classes. 289 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 290 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 291 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 292 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 293 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 294 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 295 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 296 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 297 298 // Create array interface entries to populate once we can load system classes. 299 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 300 301 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 302 Handle<mirror::Class> int_array_class(hs.NewHandle( 303 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 304 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 305 mirror::IntArray::SetArrayClass(int_array_class.Get()); 306 SetClassRoot(kIntArrayClass, int_array_class.Get()); 307 308 // now that these are registered, we can use AllocClass() and AllocObjectArray 309 310 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 311 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 312 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 313 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 314 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 315 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 316 317 // Constructor, Field, Method, and AbstractMethod are necessary so 318 // that FindClass can link members. 319 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 320 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 321 CHECK(java_lang_reflect_ArtField.Get() != nullptr); 322 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 323 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 324 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 325 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 326 327 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 328 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 329 CHECK(java_lang_reflect_ArtMethod.Get() != nullptr); 330 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 331 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 332 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 333 334 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 335 336 // Set up array classes for string, field, method 337 Handle<mirror::Class> object_array_string(hs.NewHandle( 338 AllocClass(self, java_lang_Class.Get(), 339 mirror::ObjectArray<mirror::String>::ClassSize()))); 340 object_array_string->SetComponentType(java_lang_String.Get()); 341 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 342 343 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 344 AllocClass(self, java_lang_Class.Get(), 345 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 346 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 347 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 348 349 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 350 AllocClass(self, java_lang_Class.Get(), 351 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 352 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 353 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 354 355 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 356 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 357 // these roots. 358 CHECK_NE(0U, boot_class_path.size()); 359 for (size_t i = 0; i != boot_class_path.size(); ++i) { 360 const DexFile* dex_file = boot_class_path[i]; 361 CHECK(dex_file != nullptr); 362 AppendToBootClassPath(*dex_file); 363 } 364 365 // now we can use FindSystemClass 366 367 // run char class through InitializePrimitiveClass to finish init 368 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 369 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 370 371 // Create runtime resolution and imt conflict methods. Also setup the default imt. 372 Runtime* runtime = Runtime::Current(); 373 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 374 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 375 runtime->SetImtUnimplementedMethod(runtime->CreateImtConflictMethod()); 376 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 377 378 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 379 // we do not need friend classes or a publicly exposed setter. 380 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 381 if (!runtime->IsCompiler()) { 382 // We need to set up the generic trampolines since we don't have an image. 383 quick_resolution_trampoline_ = reinterpret_cast<void*>(art_quick_resolution_trampoline); 384 quick_imt_conflict_trampoline_ = reinterpret_cast<void*>(art_quick_imt_conflict_trampoline); 385 quick_to_interpreter_bridge_trampoline_ = reinterpret_cast<void*>(art_quick_to_interpreter_bridge); 386 } 387 388 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 389 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 390 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 391 CHECK_EQ(java_lang_Object.Get(), Object_class); 392 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 393 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 394 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 395 std::ostringstream os1, os2; 396 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 397 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 398 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 399 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 400 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 401 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 402 CHECK_EQ(java_lang_String.Get(), String_class); 403 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 404 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 405 406 // Setup the primitive array type classes - can't be done until Object has a vtable. 407 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 408 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 409 410 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 411 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 412 413 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 414 CHECK_EQ(char_array_class.Get(), found_char_array_class); 415 416 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 417 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 418 419 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 420 CHECK_EQ(int_array_class.Get(), found_int_array_class); 421 422 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 423 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 424 425 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 426 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 427 428 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 429 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 430 431 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 432 CHECK_EQ(class_array_class.Get(), found_class_array_class); 433 434 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 435 CHECK_EQ(object_array_class.Get(), found_object_array_class); 436 437 // Setup the single, global copy of "iftable". 438 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 439 CHECK(java_lang_Cloneable != nullptr); 440 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 441 CHECK(java_io_Serializable != nullptr); 442 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 443 // crawl up and explicitly list all of the supers as well. 444 { 445 mirror::IfTable* array_iftable = array_iftable_.Read(); 446 array_iftable->SetInterface(0, java_lang_Cloneable); 447 array_iftable->SetInterface(1, java_io_Serializable); 448 } 449 450 // Sanity check Class[] and Object[]'s interfaces. 451 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 452 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 453 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 454 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 455 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 456 // dex_cache_ fields and register them in class_table_. 457 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 458 CHECK_EQ(java_lang_Class.Get(), Class_class); 459 460 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 461 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 462 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 463 464 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 465 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 466 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 467 468 mirror::Class* String_array_class = 469 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 470 CHECK_EQ(object_array_string.Get(), String_array_class); 471 472 mirror::Class* Art_method_array_class = 473 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 474 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 475 476 mirror::Class* Art_field_array_class = 477 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 478 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 479 480 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 481 482 // Create java.lang.reflect.Proxy root. 483 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 484 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 485 486 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 487 // finish initializing Reference class 488 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 489 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 490 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 491 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 492 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 493 mirror::Class* java_lang_ref_FinalizerReference = 494 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 495 java_lang_ref_FinalizerReference->SetAccessFlags( 496 java_lang_ref_FinalizerReference->GetAccessFlags() | 497 kAccClassIsReference | kAccClassIsFinalizerReference); 498 mirror::Class* java_lang_ref_PhantomReference = 499 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 500 java_lang_ref_PhantomReference->SetAccessFlags( 501 java_lang_ref_PhantomReference->GetAccessFlags() | 502 kAccClassIsReference | kAccClassIsPhantomReference); 503 mirror::Class* java_lang_ref_SoftReference = 504 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 505 java_lang_ref_SoftReference->SetAccessFlags( 506 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 507 mirror::Class* java_lang_ref_WeakReference = 508 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 509 java_lang_ref_WeakReference->SetAccessFlags( 510 java_lang_ref_WeakReference->GetAccessFlags() | 511 kAccClassIsReference | kAccClassIsWeakReference); 512 513 // Setup the ClassLoader, verifying the object_size_. 514 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 515 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 516 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 517 518 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 519 // java.lang.StackTraceElement as a convenience. 520 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 521 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 522 SetClassRoot(kJavaLangClassNotFoundException, 523 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 524 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 525 SetClassRoot(kJavaLangStackTraceElementArrayClass, 526 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 527 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 528 529 FinishInit(self); 530 531 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 532} 533 534void ClassLinker::FinishInit(Thread* self) { 535 VLOG(startup) << "ClassLinker::FinishInit entering"; 536 537 // Let the heap know some key offsets into java.lang.ref instances 538 // Note: we hard code the field indexes here rather than using FindInstanceField 539 // as the types of the field can't be resolved prior to the runtime being 540 // fully initialized 541 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 542 mirror::Class* java_lang_ref_FinalizerReference = 543 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 544 545 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 546 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 547 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 548 549 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 550 CHECK_STREQ(queue->GetName(), "queue"); 551 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 552 553 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 554 CHECK_STREQ(queueNext->GetName(), "queueNext"); 555 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 556 557 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 558 CHECK_STREQ(referent->GetName(), "referent"); 559 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 560 561 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 562 CHECK_STREQ(zombie->GetName(), "zombie"); 563 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 564 565 // ensure all class_roots_ are initialized 566 for (size_t i = 0; i < kClassRootsMax; i++) { 567 ClassRoot class_root = static_cast<ClassRoot>(i); 568 mirror::Class* klass = GetClassRoot(class_root); 569 CHECK(klass != nullptr); 570 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != nullptr); 571 // note SetClassRoot does additional validation. 572 // if possible add new checks there to catch errors early 573 } 574 575 CHECK(!array_iftable_.IsNull()); 576 577 // disable the slow paths in FindClass and CreatePrimitiveClass now 578 // that Object, Class, and Object[] are setup 579 init_done_ = true; 580 581 VLOG(startup) << "ClassLinker::FinishInit exiting"; 582} 583 584void ClassLinker::RunRootClinits() { 585 Thread* self = Thread::Current(); 586 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 587 mirror::Class* c = GetClassRoot(ClassRoot(i)); 588 if (!c->IsArrayClass() && !c->IsPrimitive()) { 589 StackHandleScope<1> hs(self); 590 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 591 EnsureInitialized(h_class, true, true); 592 self->AssertNoPendingException(); 593 } 594 } 595} 596 597bool ClassLinker::GenerateOatFile(const char* dex_filename, 598 int oat_fd, 599 const char* oat_cache_filename, 600 std::string* error_msg) { 601 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 602 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 603 604 gc::Heap* heap = Runtime::Current()->GetHeap(); 605 std::string boot_image_option("--boot-image="); 606 if (heap->GetImageSpace() == nullptr) { 607 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 608 // out of space anyway it might not matter. 609 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 610 "without an image.", dex_filename); 611 return false; 612 } 613 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 614 615 std::string dex_file_option("--dex-file="); 616 dex_file_option += dex_filename; 617 618 std::string oat_fd_option("--oat-fd="); 619 StringAppendF(&oat_fd_option, "%d", oat_fd); 620 621 std::string oat_location_option("--oat-location="); 622 oat_location_option += oat_cache_filename; 623 624 std::vector<std::string> argv; 625 argv.push_back(dex2oat); 626 argv.push_back("--runtime-arg"); 627 argv.push_back("-classpath"); 628 argv.push_back("--runtime-arg"); 629 argv.push_back(Runtime::Current()->GetClassPathString()); 630 631 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 632 633 if (!Runtime::Current()->IsVerificationEnabled()) { 634 argv.push_back("--compiler-filter=verify-none"); 635 } 636 637 if (Runtime::Current()->MustRelocateIfPossible()) { 638 argv.push_back("--runtime-arg"); 639 argv.push_back("-Xrelocate"); 640 } else { 641 argv.push_back("--runtime-arg"); 642 argv.push_back("-Xnorelocate"); 643 } 644 645 if (!kIsTargetBuild) { 646 argv.push_back("--host"); 647 } 648 649 argv.push_back(boot_image_option); 650 argv.push_back(dex_file_option); 651 argv.push_back(oat_fd_option); 652 argv.push_back(oat_location_option); 653 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 654 for (size_t i = 0; i < compiler_options.size(); ++i) { 655 argv.push_back(compiler_options[i].c_str()); 656 } 657 658 return Exec(argv, error_msg); 659} 660 661const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 662 WriterMutexLock mu(Thread::Current(), dex_lock_); 663 if (kIsDebugBuild) { 664 for (size_t i = 0; i < oat_files_.size(); ++i) { 665 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 666 } 667 } 668 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 669 oat_files_.push_back(oat_file); 670 return oat_file; 671} 672 673OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 674 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 675 OatFile* oat_file = space->ReleaseOatFile(); 676 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 677 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 678 return *oat_file; 679} 680 681const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFileForDexFile(const DexFile& dex_file) { 682 const char* dex_location = dex_file.GetLocation().c_str(); 683 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 684 return FindOpenedOatDexFile(nullptr, dex_location, &dex_location_checksum); 685} 686 687const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFile(const char* oat_location, 688 const char* dex_location, 689 const uint32_t* dex_location_checksum) { 690 ReaderMutexLock mu(Thread::Current(), dex_lock_); 691 for (const OatFile* oat_file : oat_files_) { 692 DCHECK(oat_file != nullptr); 693 694 if (oat_location != nullptr) { 695 if (oat_file->GetLocation() != oat_location) { 696 continue; 697 } 698 } 699 700 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 701 dex_location_checksum, 702 false); 703 if (oat_dex_file != nullptr) { 704 return oat_dex_file; 705 } 706 } 707 return nullptr; 708} 709 710 711// Loads all multi dex files from the given oat file returning true on success. 712// 713// Parameters: 714// oat_file - the oat file to load from 715// dex_location - the dex location used to generate the oat file 716// dex_location_checksum - the checksum of the dex_location (may be null for pre-opted files) 717// generated - whether or not the oat_file existed before or was just (re)generated 718// error_msgs - any error messages will be appended here 719// dex_files - the loaded dex_files will be appended here (only if the loading succeeds) 720static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, 721 const char* dex_location, 722 const uint32_t* dex_location_checksum, 723 bool generated, 724 std::vector<std::string>* error_msgs, 725 std::vector<const DexFile*>* dex_files) { 726 if (oat_file == nullptr) { 727 return false; 728 } 729 730 size_t old_size = dex_files->size(); // To rollback on error. 731 732 bool success = true; 733 for (size_t i = 0; success; ++i) { 734 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 735 const char* next_name = next_name_str.c_str(); 736 737 uint32_t next_location_checksum; 738 uint32_t* next_location_checksum_pointer = &next_location_checksum; 739 std::string error_msg; 740 if ((i == 0) && (strcmp(next_name, dex_location) == 0)) { 741 // When i=0 the multidex name should be the same as the location name. We already have the 742 // checksum it so we don't need to recompute it. 743 if (dex_location_checksum == nullptr) { 744 next_location_checksum_pointer = nullptr; 745 } else { 746 next_location_checksum = *dex_location_checksum; 747 } 748 } else if (!DexFile::GetChecksum(next_name, next_location_checksum_pointer, &error_msg)) { 749 DCHECK_EQ(false, i == 0 && generated); 750 next_location_checksum_pointer = nullptr; 751 } 752 753 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 754 755 if (oat_dex_file == nullptr) { 756 if (i == 0 && generated) { 757 std::string error_msg; 758 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 759 " file'%s'", dex_location, next_location_checksum, 760 oat_file->GetLocation().c_str()); 761 error_msgs->push_back(error_msg); 762 } 763 break; // Not found, done. 764 } 765 766 // Checksum test. Test must succeed when generated. 767 success = !generated; 768 if (next_location_checksum_pointer != nullptr) { 769 success = next_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 770 } 771 772 if (success) { 773 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 774 if (dex_file == nullptr) { 775 success = false; 776 error_msgs->push_back(error_msg); 777 } else { 778 dex_files->push_back(dex_file); 779 } 780 } 781 782 // When we generated the file, we expect success, or something is terribly wrong. 783 CHECK_EQ(false, generated && !success) 784 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 785 << std::hex << " dex_location_checksum=" << next_location_checksum 786 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 787 } 788 789 if (dex_files->size() == old_size) { 790 success = false; // We did not even find classes.dex 791 } 792 793 if (success) { 794 return true; 795 } else { 796 // Free all the dex files we have loaded. 797 auto it = dex_files->begin() + old_size; 798 auto it_end = dex_files->end(); 799 for (; it != it_end; it++) { 800 delete *it; 801 } 802 dex_files->erase(dex_files->begin() + old_size, it_end); 803 804 return false; 805 } 806} 807 808// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 809// complicates the loading process, as we should not use an iterative loading process, because that 810// would register the oat file and dex files that come before the broken one. Instead, check all 811// multidex ahead of time. 812bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 813 std::vector<std::string>* error_msgs, 814 std::vector<const DexFile*>* dex_files) { 815 // 1) Check whether we have an open oat file. 816 // This requires a dex checksum, use the "primary" one. 817 uint32_t dex_location_checksum; 818 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 819 bool have_checksum = true; 820 std::string checksum_error_msg; 821 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 822 // This happens for pre-opted files since the corresponding dex files are no longer on disk. 823 dex_location_checksum_pointer = nullptr; 824 have_checksum = false; 825 } 826 827 bool needs_registering = false; 828 829 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFile(oat_location, dex_location, 830 dex_location_checksum_pointer); 831 std::unique_ptr<const OatFile> open_oat_file( 832 oat_dex_file != nullptr ? oat_dex_file->GetOatFile() : nullptr); 833 834 // 2) If we do not have an open one, maybe there's one on disk already. 835 836 // In case the oat file is not open, we play a locking game here so 837 // that if two different processes race to load and register or generate 838 // (or worse, one tries to open a partial generated file) we will be okay. 839 // This is actually common with apps that use DexClassLoader to work 840 // around the dex method reference limit and that have a background 841 // service running in a separate process. 842 ScopedFlock scoped_flock; 843 844 if (open_oat_file.get() == nullptr) { 845 if (oat_location != nullptr) { 846 // Can only do this if we have a checksum, else error. 847 if (!have_checksum) { 848 error_msgs->push_back(checksum_error_msg); 849 return false; 850 } 851 852 std::string error_msg; 853 854 // We are loading or creating one in the future. Time to set up the file lock. 855 if (!scoped_flock.Init(oat_location, &error_msg)) { 856 error_msgs->push_back(error_msg); 857 return false; 858 } 859 860 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 861 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 862 oat_location, &error_msg)); 863 864 if (open_oat_file.get() == nullptr) { 865 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 866 dex_location, oat_location, error_msg.c_str()); 867 VLOG(class_linker) << compound_msg; 868 error_msgs->push_back(compound_msg); 869 } 870 } else { 871 // TODO: What to lock here? 872 bool obsolete_file_cleanup_failed; 873 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 874 dex_location_checksum_pointer, 875 kRuntimeISA, error_msgs, 876 &obsolete_file_cleanup_failed)); 877 // There's no point in going forward and eventually try to regenerate the 878 // file if we couldn't remove the obsolete one. Mostly likely we will fail 879 // with the same error when trying to write the new file. 880 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 881 if (obsolete_file_cleanup_failed) { 882 return false; 883 } 884 } 885 needs_registering = true; 886 } 887 888 // 3) If we have an oat file, check all contained multidex files for our dex_location. 889 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 890 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 891 dex_location_checksum_pointer, 892 false, error_msgs, dex_files); 893 if (success) { 894 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 895 if (needs_registering) { 896 // We opened the oat file, so we must register it. 897 RegisterOatFile(oat_file); 898 } 899 // If the file isn't executable we failed patchoat but did manage to get the dex files. 900 return oat_file->IsExecutable(); 901 } else { 902 if (needs_registering) { 903 // We opened it, delete it. 904 open_oat_file.reset(); 905 } else { 906 open_oat_file.release(); // Do not delete open oat files. 907 } 908 } 909 910 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 911 912 // Need a checksum, fail else. 913 if (!have_checksum) { 914 error_msgs->push_back(checksum_error_msg); 915 return false; 916 } 917 918 // Look in cache location if no oat_location is given. 919 std::string cache_location; 920 if (oat_location == nullptr) { 921 // Use the dalvik cache. 922 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 923 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 924 oat_location = cache_location.c_str(); 925 } 926 927 bool has_flock = true; 928 // Definitely need to lock now. 929 if (!scoped_flock.HasFile()) { 930 std::string error_msg; 931 if (!scoped_flock.Init(oat_location, &error_msg)) { 932 error_msgs->push_back(error_msg); 933 has_flock = false; 934 } 935 } 936 937 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 938 // Create the oat file. 939 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 940 oat_location, error_msgs)); 941 } 942 943 // Failed, bail. 944 if (open_oat_file.get() == nullptr) { 945 std::string error_msg; 946 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 947 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 948 error_msgs->push_back(error_msg); 949 return false; 950 } 951 952 // Try to load again, but stronger checks. 953 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 954 dex_location_checksum_pointer, 955 true, error_msgs, dex_files); 956 if (success) { 957 RegisterOatFile(open_oat_file.release()); 958 return true; 959 } else { 960 return false; 961 } 962} 963 964const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 965 uint32_t dex_location_checksum, 966 const char* oat_location, 967 std::string* error_msg) { 968 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, 969 !Runtime::Current()->IsCompiler(), 970 error_msg)); 971 if (oat_file.get() == nullptr) { 972 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 973 error_msg->c_str()); 974 return nullptr; 975 } 976 Runtime* runtime = Runtime::Current(); 977 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 978 if (image_space != nullptr) { 979 const ImageHeader& image_header = image_space->GetImageHeader(); 980 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 981 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 982 if (expected_image_oat_checksum != actual_image_oat_checksum) { 983 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 984 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 985 actual_image_oat_checksum); 986 return nullptr; 987 } 988 989 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 990 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 991 if (expected_image_oat_offset != actual_image_oat_offset) { 992 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 993 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 994 actual_image_oat_offset); 995 return nullptr; 996 } 997 int32_t expected_patch_delta = image_header.GetPatchDelta(); 998 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 999 if (expected_patch_delta != actual_patch_delta) { 1000 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 1001 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 1002 return nullptr; 1003 } 1004 } 1005 1006 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1007 &dex_location_checksum); 1008 if (oat_dex_file == nullptr) { 1009 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 1010 dex_location); 1011 return nullptr; 1012 } 1013 uint32_t expected_dex_checksum = dex_location_checksum; 1014 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 1015 if (expected_dex_checksum != actual_dex_checksum) { 1016 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 1017 "found 0x%x", oat_location, expected_dex_checksum, 1018 actual_dex_checksum); 1019 return nullptr; 1020 } 1021 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 1022 if (dex_file.get() != nullptr) { 1023 return oat_file.release(); 1024 } else { 1025 return nullptr; 1026 } 1027} 1028 1029const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1030 int fd, const char* oat_location, 1031 std::vector<std::string>* error_msgs) { 1032 // Generate the output oat file for the dex file 1033 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1034 std::string error_msg; 1035 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1036 CHECK(!error_msg.empty()); 1037 error_msgs->push_back(error_msg); 1038 return nullptr; 1039 } 1040 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, 1041 !Runtime::Current()->IsCompiler(), 1042 &error_msg)); 1043 if (oat_file.get() == nullptr) { 1044 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1045 oat_location, error_msg.c_str()); 1046 error_msgs->push_back(compound_msg); 1047 return nullptr; 1048 } 1049 1050 return oat_file.release(); 1051} 1052 1053bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1054 const InstructionSet instruction_set) { 1055 Runtime* runtime = Runtime::Current(); 1056 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1057 if (image_space == nullptr) { 1058 return false; 1059 } 1060 uint32_t image_oat_checksum = 0; 1061 if (instruction_set == kRuntimeISA) { 1062 const ImageHeader& image_header = image_space->GetImageHeader(); 1063 image_oat_checksum = image_header.GetOatChecksum(); 1064 } else { 1065 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1066 image_space->GetImageLocation().c_str(), instruction_set)); 1067 image_oat_checksum = image_header->GetOatChecksum(); 1068 } 1069 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1070} 1071 1072bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1073 const InstructionSet instruction_set, 1074 std::string* error_msg) { 1075 Runtime* runtime = Runtime::Current(); 1076 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1077 if (image_space == nullptr) { 1078 *error_msg = "No image space for verification against"; 1079 return false; 1080 } 1081 1082 // If the requested instruction set is the same as the current runtime, 1083 // we can use the checksums directly. If it isn't, we'll have to read the 1084 // image header from the image for the right instruction set. 1085 uint32_t image_oat_checksum = 0; 1086 uintptr_t image_oat_data_begin = 0; 1087 int32_t image_patch_delta = 0; 1088 if (instruction_set == runtime->GetInstructionSet()) { 1089 const ImageHeader& image_header = image_space->GetImageHeader(); 1090 image_oat_checksum = image_header.GetOatChecksum(); 1091 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1092 image_patch_delta = image_header.GetPatchDelta(); 1093 } else { 1094 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1095 image_space->GetImageLocation().c_str(), instruction_set)); 1096 image_oat_checksum = image_header->GetOatChecksum(); 1097 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1098 image_patch_delta = image_header->GetPatchDelta(); 1099 } 1100 const OatHeader& oat_header = oat_file->GetOatHeader(); 1101 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1102 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1103 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1104 if (!ret) { 1105 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1106 oat_file->GetLocation().c_str(), 1107 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1108 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1109 oat_file->GetOatHeader().GetImagePatchDelta(), 1110 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1111 } 1112 return ret; 1113} 1114 1115bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1116 const char* dex_location, 1117 uint32_t dex_location_checksum, 1118 const InstructionSet instruction_set, 1119 std::string* error_msg) { 1120 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1121 return false; 1122 } 1123 1124 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1125 &dex_location_checksum); 1126 if (oat_dex_file == nullptr) { 1127 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1128 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1129 for (const OatFile::OatDexFile* oat_dex_file : oat_file->GetOatDexFiles()) { 1130 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s' with checksum 0x%x", 1131 oat_file->GetLocation().c_str(), 1132 oat_dex_file->GetDexFileLocation().c_str(), 1133 oat_dex_file->GetDexFileLocationChecksum()); 1134 } 1135 return false; 1136 } 1137 1138 if (dex_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) { 1139 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1140 oat_file->GetLocation().c_str(), 1141 oat_dex_file->GetDexFileLocationChecksum(), 1142 dex_location, dex_location_checksum); 1143 return false; 1144 } 1145 return true; 1146} 1147 1148bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1149 const char* dex_location, 1150 const uint32_t* dex_location_checksum, 1151 std::string* error_msg) { 1152 CHECK(oat_file != nullptr); 1153 CHECK(dex_location != nullptr); 1154 std::unique_ptr<const DexFile> dex_file; 1155 if (dex_location_checksum == nullptr) { 1156 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1157 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1158 // directory. 1159 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, nullptr); 1160 if (oat_dex_file == nullptr) { 1161 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1162 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1163 error_msg->c_str()); 1164 return false; 1165 } 1166 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1167 } else { 1168 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, *dex_location_checksum, 1169 kRuntimeISA, error_msg); 1170 if (!verified) { 1171 return false; 1172 } 1173 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1174 dex_location_checksum)->OpenDexFile(error_msg)); 1175 } 1176 return dex_file.get() != nullptr; 1177} 1178 1179const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1180 const char* dex_location, 1181 const uint32_t* dex_location_checksum, 1182 InstructionSet isa, 1183 std::vector<std::string>* error_msgs, 1184 bool* obsolete_file_cleanup_failed) { 1185 *obsolete_file_cleanup_failed = false; 1186 bool already_opened = false; 1187 std::string dex_location_str(dex_location); 1188 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1189 &already_opened, 1190 obsolete_file_cleanup_failed, 1191 error_msgs)); 1192 std::string error_msg; 1193 if (oat_file.get() == nullptr) { 1194 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1195 dex_location)); 1196 return nullptr; 1197 } else if (oat_file->IsExecutable() && 1198 !VerifyOatWithDexFile(oat_file.get(), dex_location, 1199 dex_location_checksum, &error_msg)) { 1200 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1201 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1202 error_msg.c_str())); 1203 return nullptr; 1204 } else if (!oat_file->IsExecutable() && 1205 Runtime::Current()->GetHeap()->HasImageSpace() && 1206 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1207 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1208 "dex location '%s'. Image checksum incorrect.", 1209 oat_file->GetLocation().c_str(), dex_location)); 1210 return nullptr; 1211 } else { 1212 return oat_file.release(); 1213 } 1214} 1215 1216const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1217 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1218 for (size_t i = 0; i < oat_files_.size(); i++) { 1219 const OatFile* oat_file = oat_files_[i]; 1220 DCHECK(oat_file != nullptr); 1221 if (oat_file->GetLocation() == oat_location) { 1222 return oat_file; 1223 } 1224 } 1225 return nullptr; 1226} 1227 1228const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1229 InstructionSet isa, 1230 bool *already_opened, 1231 bool *obsolete_file_cleanup_failed, 1232 std::vector<std::string>* error_msgs) { 1233 // Find out if we've already opened the file 1234 const OatFile* ret = nullptr; 1235 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1236 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1237 if (ret != nullptr) { 1238 *already_opened = true; 1239 return ret; 1240 } 1241 1242 std::string dalvik_cache; 1243 bool have_android_data = false; 1244 bool have_dalvik_cache = false; 1245 bool is_global_cache = false; 1246 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1247 &have_android_data, &have_dalvik_cache, &is_global_cache); 1248 std::string cache_filename; 1249 if (have_dalvik_cache) { 1250 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1251 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1252 if (ret != nullptr) { 1253 *already_opened = true; 1254 return ret; 1255 } 1256 } else { 1257 // If we need to relocate we should just place odex back where it started. 1258 cache_filename = odex_filename; 1259 } 1260 1261 ret = nullptr; 1262 1263 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1264 // 1265 // Now we do the following: 1266 // 1) Try and open the odex version 1267 // 2) If present, checksum-verified & relocated correctly return it 1268 // 3) Close the odex version to free up its address space. 1269 // 4) Try and open the cache version 1270 // 5) If present, checksum-verified & relocated correctly return it 1271 // 6) Close the cache version to free up its address space. 1272 // 7) If we should relocate: 1273 // a) If we have opened and checksum-verified the odex version relocate it to 1274 // 'cache_filename' and return it 1275 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1276 // it. This should not happen often (I think only the run-test's will hit this case). 1277 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1278 // this point. 1279 // 9) Return nullptr 1280 1281 *already_opened = false; 1282 const Runtime* runtime = Runtime::Current(); 1283 CHECK(runtime != nullptr); 1284 bool executable = !runtime->IsCompiler(); 1285 1286 std::string odex_error_msg; 1287 bool should_patch_system = false; 1288 bool odex_checksum_verified = false; 1289 bool have_system_odex = false; 1290 { 1291 // There is a high probability that these both these oat files map similar/the same address 1292 // spaces so we must scope them like this so they each gets its turn. 1293 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, nullptr, 1294 executable, &odex_error_msg)); 1295 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1296 &odex_checksum_verified, 1297 &odex_error_msg)) { 1298 error_msgs->push_back(odex_error_msg); 1299 return odex_oat_file.release(); 1300 } else { 1301 if (odex_checksum_verified) { 1302 // We can just relocate 1303 should_patch_system = true; 1304 odex_error_msg = "Image Patches are incorrect"; 1305 } 1306 if (odex_oat_file.get() != nullptr) { 1307 have_system_odex = true; 1308 } 1309 } 1310 } 1311 1312 std::string cache_error_msg; 1313 bool should_patch_cache = false; 1314 bool cache_checksum_verified = false; 1315 if (have_dalvik_cache) { 1316 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, nullptr, 1317 executable, &cache_error_msg)); 1318 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1319 &cache_checksum_verified, 1320 &cache_error_msg)) { 1321 error_msgs->push_back(cache_error_msg); 1322 return cache_oat_file.release(); 1323 } else if (cache_checksum_verified) { 1324 // We can just relocate 1325 should_patch_cache = true; 1326 cache_error_msg = "Image Patches are incorrect"; 1327 } 1328 } else if (have_android_data) { 1329 // dalvik_cache does not exist but android data does. This means we should be able to create 1330 // it, so we should try. 1331 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1332 } 1333 1334 ret = nullptr; 1335 std::string error_msg; 1336 if (runtime->CanRelocate()) { 1337 // Run relocation 1338 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1339 if (space != nullptr) { 1340 const std::string& image_location = space->GetImageLocation(); 1341 if (odex_checksum_verified && should_patch_system) { 1342 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1343 } else if (cache_checksum_verified && should_patch_cache) { 1344 CHECK(have_dalvik_cache); 1345 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1346 } 1347 } else if (have_system_odex) { 1348 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1349 } 1350 } 1351 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1352 // implicitly: were able to fine where the cached version is but we were unable to use it, 1353 // either as a destination for relocation or to open a file. We should delete it if it is 1354 // there. 1355 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1356 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1357 "searching for dex file %s: %s", 1358 cache_filename.c_str(), dex_location.c_str(), 1359 strerror(errno)); 1360 error_msgs->push_back(rm_error_msg); 1361 VLOG(class_linker) << rm_error_msg; 1362 // Let the caller know that we couldn't remove the obsolete file. 1363 // This is a good indication that further writes may fail as well. 1364 *obsolete_file_cleanup_failed = true; 1365 } 1366 } 1367 if (ret == nullptr) { 1368 VLOG(class_linker) << error_msg; 1369 error_msgs->push_back(error_msg); 1370 std::string relocation_msg; 1371 if (runtime->CanRelocate()) { 1372 relocation_msg = StringPrintf(" and relocation failed"); 1373 } 1374 if (have_dalvik_cache && cache_checksum_verified) { 1375 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1376 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1377 cache_filename.c_str(), cache_error_msg.c_str(), 1378 relocation_msg.c_str()); 1379 } else { 1380 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1381 "dalvik_cache availible)%s.", odex_filename.c_str(), 1382 odex_error_msg.c_str(), relocation_msg.c_str()); 1383 } 1384 VLOG(class_linker) << error_msg; 1385 error_msgs->push_back(error_msg); 1386 } 1387 return ret; 1388} 1389 1390const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1391 InstructionSet isa, 1392 std::string* error_msg) { 1393 // We open it non-executable 1394 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, nullptr, false, error_msg)); 1395 if (output.get() == nullptr) { 1396 return nullptr; 1397 } 1398 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1399 VerifyOatImageChecksum(output.get(), isa)) { 1400 return output.release(); 1401 } else { 1402 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1403 oat_path.c_str()); 1404 return nullptr; 1405 } 1406} 1407 1408const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1409 const std::string& output_oat, 1410 const std::string& image_location, 1411 InstructionSet isa, 1412 std::string* error_msg) { 1413 if (!Runtime::Current()->GetHeap()->HasImageSpace()) { 1414 // We don't have an image space so there is no point in trying to patchoat. 1415 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1416 << "running without an image. Attempting to use oat file for interpretation."; 1417 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1418 } 1419 if (!Runtime::Current()->IsDex2OatEnabled()) { 1420 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1421 // input_oat but make sure we only do interpretation on it's dex files. 1422 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1423 << "disabled. Attempting to use oat file for interpretation"; 1424 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1425 } 1426 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1427 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1428 1429 std::string isa_arg("--instruction-set="); 1430 isa_arg += GetInstructionSetString(isa); 1431 std::string input_oat_filename_arg("--input-oat-file="); 1432 input_oat_filename_arg += input_oat; 1433 std::string output_oat_filename_arg("--output-oat-file="); 1434 output_oat_filename_arg += output_oat; 1435 std::string patched_image_arg("--patched-image-location="); 1436 patched_image_arg += image_location; 1437 1438 std::vector<std::string> argv; 1439 argv.push_back(patchoat); 1440 argv.push_back(isa_arg); 1441 argv.push_back(input_oat_filename_arg); 1442 argv.push_back(output_oat_filename_arg); 1443 argv.push_back(patched_image_arg); 1444 1445 std::string command_line(Join(argv, ' ')); 1446 LOG(INFO) << "Relocate Oat File: " << command_line; 1447 bool success = Exec(argv, error_msg); 1448 if (success) { 1449 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, nullptr, 1450 !Runtime::Current()->IsCompiler(), error_msg)); 1451 bool checksum_verified = false; 1452 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1453 return output.release(); 1454 } else if (output.get() != nullptr) { 1455 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1456 "but output file '%s' failed verifcation: %s", 1457 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1458 } else { 1459 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1460 "but was unable to open output file '%s': %s", 1461 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1462 } 1463 } else if (!Runtime::Current()->IsCompiler()) { 1464 // patchoat failed which means we probably don't have enough room to place the output oat file, 1465 // instead of failing we should just run the interpreter from the dex files in the input oat. 1466 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1467 << "for interpretation. patchoat failure was: " << *error_msg; 1468 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1469 } else { 1470 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1471 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1472 error_msg->c_str()); 1473 } 1474 return nullptr; 1475} 1476 1477int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1478 Runtime* runtime = Runtime::Current(); 1479 int32_t real_patch_delta; 1480 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1481 CHECK(image_space != nullptr); 1482 if (isa == Runtime::Current()->GetInstructionSet()) { 1483 const ImageHeader& image_header = image_space->GetImageHeader(); 1484 real_patch_delta = image_header.GetPatchDelta(); 1485 } else { 1486 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1487 image_space->GetImageLocation().c_str(), isa)); 1488 real_patch_delta = image_header->GetPatchDelta(); 1489 } 1490 const OatHeader& oat_header = oat_file->GetOatHeader(); 1491 return real_patch_delta - oat_header.GetImagePatchDelta(); 1492} 1493 1494bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1495 bool* checksum_verified, 1496 std::string* error_msg) { 1497 std::string compound_msg("Oat file failed to verify: "); 1498 Runtime* runtime = Runtime::Current(); 1499 uint32_t real_image_checksum; 1500 void* real_image_oat_offset; 1501 int32_t real_patch_delta; 1502 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1503 if (image_space == nullptr) { 1504 *error_msg = "No image space present"; 1505 return false; 1506 } 1507 if (isa == Runtime::Current()->GetInstructionSet()) { 1508 const ImageHeader& image_header = image_space->GetImageHeader(); 1509 real_image_checksum = image_header.GetOatChecksum(); 1510 real_image_oat_offset = image_header.GetOatDataBegin(); 1511 real_patch_delta = image_header.GetPatchDelta(); 1512 } else { 1513 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1514 image_space->GetImageLocation().c_str(), isa)); 1515 real_image_checksum = image_header->GetOatChecksum(); 1516 real_image_oat_offset = image_header->GetOatDataBegin(); 1517 real_patch_delta = image_header->GetPatchDelta(); 1518 } 1519 1520 const OatHeader& oat_header = oat_file->GetOatHeader(); 1521 1522 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1523 *checksum_verified = oat_image_checksum == real_image_checksum; 1524 if (!*checksum_verified) { 1525 compound_msg += StringPrintf(" Oat Image Checksum Incorrect (expected 0x%x, recieved 0x%x)", 1526 real_image_checksum, oat_image_checksum); 1527 } 1528 1529 void* oat_image_oat_offset = 1530 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1531 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1532 if (!offset_verified) { 1533 compound_msg += StringPrintf(" Oat Image oat offset incorrect (expected 0x%p, recieved 0x%p)", 1534 real_image_oat_offset, oat_image_oat_offset); 1535 } 1536 1537 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1538 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1539 if (!patch_delta_verified) { 1540 compound_msg += StringPrintf(" Oat image patch delta incorrect (expected 0x%x, recieved 0x%x)", 1541 real_patch_delta, oat_patch_delta); 1542 } 1543 1544 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1545 if (ret) { 1546 *error_msg = compound_msg; 1547 } 1548 return ret; 1549} 1550 1551const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1552 std::string* error_msg) { 1553 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1554 if (oat_file != nullptr) { 1555 return oat_file; 1556 } 1557 1558 return OatFile::Open(oat_location, oat_location, nullptr, !Runtime::Current()->IsCompiler(), 1559 error_msg); 1560} 1561 1562static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1563 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1564 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1565 1566 DCHECK(obj != nullptr); 1567 DCHECK(class_linker != nullptr); 1568 1569 if (obj->IsArtMethod()) { 1570 mirror::ArtMethod* method = obj->AsArtMethod(); 1571 if (!method->IsNative()) { 1572 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1573 if (method != Runtime::Current()->GetResolutionMethod()) { 1574 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1575#if defined(ART_USE_PORTABLE_COMPILER) 1576 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1577#endif 1578 } 1579 } 1580 } 1581} 1582 1583void ClassLinker::InitFromImage() { 1584 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1585 CHECK(!init_done_); 1586 1587 Thread* self = Thread::Current(); 1588 gc::Heap* heap = Runtime::Current()->GetHeap(); 1589 gc::space::ImageSpace* space = heap->GetImageSpace(); 1590 dex_cache_image_class_lookup_required_ = true; 1591 CHECK(space != nullptr); 1592 OatFile& oat_file = GetImageOatFile(space); 1593 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1594 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1595 const char* image_file_location = oat_file.GetOatHeader(). 1596 GetStoreValueByKey(OatHeader::kImageLocationKey); 1597 CHECK(image_file_location == nullptr || *image_file_location == 0); 1598 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1599 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1600 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1601 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1602 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1603 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1604 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1605 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1606 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1607 1608 StackHandleScope<1> hs(self); 1609 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1610 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1611 AsObjectArray<mirror::Class>())); 1612 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1613 1614 // Special case of setting up the String class early so that we can test arbitrary objects 1615 // as being Strings or not 1616 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1617 1618 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1619 static_cast<uint32_t>(dex_caches->GetLength())); 1620 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1621 StackHandleScope<1> hs(self); 1622 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1623 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1624 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1625 nullptr); 1626 CHECK(oat_dex_file != nullptr) << oat_file.GetLocation() << " " << dex_file_location; 1627 std::string error_msg; 1628 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1629 if (dex_file == nullptr) { 1630 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1631 << " from within oat file " << oat_file.GetLocation() 1632 << " error '" << error_msg << "'"; 1633 } 1634 1635 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1636 1637 AppendToBootClassPath(*dex_file, dex_cache); 1638 } 1639 1640 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1641 // bitmap walk. 1642 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1643 1644 // Set entry point to interpreter if in InterpretOnly mode. 1645 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1646 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1647 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1648 } 1649 1650 // reinit class_roots_ 1651 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1652 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1653 1654 // reinit array_iftable_ from any array class instance, they should be == 1655 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1656 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1657 // String class root was set above 1658 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1659 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1660 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1661 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1662 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1663 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1664 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1665 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1666 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1667 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1668 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1669 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1670 1671 FinishInit(self); 1672 1673 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1674} 1675 1676void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1677 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1678 if ((flags & kVisitRootFlagAllRoots) != 0) { 1679 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1680 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1681 } 1682 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1683 for (auto& pair : new_class_roots_) { 1684 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1685 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1686 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1687 if (UNLIKELY(new_ref != old_ref)) { 1688 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1689 // corresponding object. This is slow, but luckily for us, this may only happen with a 1690 // concurrent moving GC. 1691 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1692 it != end && it->first == pair.first; ++it) { 1693 // If the class stored matches the old class, update it to the new value. 1694 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1695 it->second = GcRoot<mirror::Class>(new_ref); 1696 } 1697 } 1698 } 1699 } 1700 } 1701 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1702 new_class_roots_.clear(); 1703 } 1704 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1705 log_new_class_table_roots_ = true; 1706 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1707 log_new_class_table_roots_ = false; 1708 } 1709 // We deliberately ignore the class roots in the image since we 1710 // handle image roots by using the MS/CMS rescanning of dirty cards. 1711} 1712 1713// Keep in sync with InitCallback. Anything we visit, we need to 1714// reinit references to when reinitializing a ClassLinker from a 1715// mapped image. 1716void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1717 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1718 Thread* self = Thread::Current(); 1719 { 1720 ReaderMutexLock mu(self, dex_lock_); 1721 if ((flags & kVisitRootFlagAllRoots) != 0) { 1722 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1723 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1724 } 1725 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1726 for (size_t index : new_dex_cache_roots_) { 1727 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1728 } 1729 } 1730 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1731 new_dex_cache_roots_.clear(); 1732 } 1733 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1734 log_new_dex_caches_roots_ = true; 1735 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1736 log_new_dex_caches_roots_ = false; 1737 } 1738 } 1739 VisitClassRoots(callback, arg, flags); 1740 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1741 DCHECK(!array_iftable_.IsNull()); 1742 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1743 if (!find_array_class_cache_[i].IsNull()) { 1744 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1745 } 1746 } 1747} 1748 1749void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1750 if (dex_cache_image_class_lookup_required_) { 1751 MoveImageClassesToClassTable(); 1752 } 1753 // TODO: why isn't this a ReaderMutexLock? 1754 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1755 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1756 mirror::Class* c = it.second.Read(); 1757 if (!visitor(c, arg)) { 1758 return; 1759 } 1760 } 1761} 1762 1763static bool GetClassesVisitorSet(mirror::Class* c, void* arg) { 1764 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1765 classes->insert(c); 1766 return true; 1767} 1768 1769struct GetClassesVisitorArrayArg { 1770 Handle<mirror::ObjectArray<mirror::Class>>* classes; 1771 int32_t index; 1772 bool success; 1773}; 1774 1775static bool GetClassesVisitorArray(mirror::Class* c, void* varg) 1776 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1777 GetClassesVisitorArrayArg* arg = reinterpret_cast<GetClassesVisitorArrayArg*>(varg); 1778 if (arg->index < (*arg->classes)->GetLength()) { 1779 (*arg->classes)->Set(arg->index, c); 1780 arg->index++; 1781 return true; 1782 } else { 1783 arg->success = false; 1784 return false; 1785 } 1786} 1787 1788void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1789 // TODO: it may be possible to avoid secondary storage if we iterate over dex caches. The problem 1790 // is avoiding duplicates. 1791 if (!kMovingClasses) { 1792 std::set<mirror::Class*> classes; 1793 VisitClasses(GetClassesVisitorSet, &classes); 1794 for (mirror::Class* klass : classes) { 1795 if (!visitor(klass, arg)) { 1796 return; 1797 } 1798 } 1799 } else { 1800 Thread* self = Thread::Current(); 1801 StackHandleScope<1> hs(self); 1802 Handle<mirror::ObjectArray<mirror::Class>> classes = 1803 hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1804 GetClassesVisitorArrayArg local_arg; 1805 local_arg.classes = &classes; 1806 local_arg.success = false; 1807 // We size the array assuming classes won't be added to the class table during the visit. 1808 // If this assumption fails we iterate again. 1809 while (!local_arg.success) { 1810 size_t class_table_size; 1811 { 1812 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1813 class_table_size = class_table_.size(); 1814 } 1815 mirror::Class* class_type = mirror::Class::GetJavaLangClass(); 1816 mirror::Class* array_of_class = FindArrayClass(self, &class_type); 1817 classes.Assign( 1818 mirror::ObjectArray<mirror::Class>::Alloc(self, array_of_class, class_table_size)); 1819 CHECK(classes.Get() != nullptr); // OOME. 1820 local_arg.index = 0; 1821 local_arg.success = true; 1822 VisitClasses(GetClassesVisitorArray, &local_arg); 1823 } 1824 for (int32_t i = 0; i < classes->GetLength(); ++i) { 1825 // If the class table shrank during creation of the clases array we expect null elements. If 1826 // the class table grew then the loop repeats. If classes are created after the loop has 1827 // finished then we don't visit. 1828 mirror::Class* klass = classes->Get(i); 1829 if (klass != nullptr && !visitor(klass, arg)) { 1830 return; 1831 } 1832 } 1833 } 1834} 1835 1836ClassLinker::~ClassLinker() { 1837 mirror::Class::ResetClass(); 1838 mirror::String::ResetClass(); 1839 mirror::Reference::ResetClass(); 1840 mirror::ArtField::ResetClass(); 1841 mirror::ArtMethod::ResetClass(); 1842 mirror::BooleanArray::ResetArrayClass(); 1843 mirror::ByteArray::ResetArrayClass(); 1844 mirror::CharArray::ResetArrayClass(); 1845 mirror::DoubleArray::ResetArrayClass(); 1846 mirror::FloatArray::ResetArrayClass(); 1847 mirror::IntArray::ResetArrayClass(); 1848 mirror::LongArray::ResetArrayClass(); 1849 mirror::ShortArray::ResetArrayClass(); 1850 mirror::Throwable::ResetClass(); 1851 mirror::StackTraceElement::ResetClass(); 1852 STLDeleteElements(&boot_class_path_); 1853 STLDeleteElements(&oat_files_); 1854} 1855 1856mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1857 gc::Heap* heap = Runtime::Current()->GetHeap(); 1858 StackHandleScope<16> hs(self); 1859 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1860 Handle<mirror::DexCache> dex_cache( 1861 hs.NewHandle(down_cast<mirror::DexCache*>( 1862 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1863 VoidFunctor())))); 1864 if (dex_cache.Get() == nullptr) { 1865 return nullptr; 1866 } 1867 Handle<mirror::String> 1868 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1869 if (location.Get() == nullptr) { 1870 return nullptr; 1871 } 1872 Handle<mirror::ObjectArray<mirror::String>> 1873 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1874 if (strings.Get() == nullptr) { 1875 return nullptr; 1876 } 1877 Handle<mirror::ObjectArray<mirror::Class>> 1878 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1879 if (types.Get() == nullptr) { 1880 return nullptr; 1881 } 1882 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1883 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1884 if (methods.Get() == nullptr) { 1885 return nullptr; 1886 } 1887 Handle<mirror::ObjectArray<mirror::ArtField>> 1888 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1889 if (fields.Get() == nullptr) { 1890 return nullptr; 1891 } 1892 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1893 fields.Get()); 1894 return dex_cache.Get(); 1895} 1896 1897mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1898 uint32_t class_size) { 1899 DCHECK_GE(class_size, sizeof(mirror::Class)); 1900 gc::Heap* heap = Runtime::Current()->GetHeap(); 1901 mirror::Class::InitializeClassVisitor visitor(class_size); 1902 mirror::Object* k = kMovingClasses ? 1903 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1904 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1905 if (UNLIKELY(k == nullptr)) { 1906 CHECK(self->IsExceptionPending()); // OOME. 1907 return nullptr; 1908 } 1909 return k->AsClass(); 1910} 1911 1912mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1913 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1914} 1915 1916mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1917 return down_cast<mirror::ArtField*>( 1918 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1919} 1920 1921mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1922 return down_cast<mirror::ArtMethod*>( 1923 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1924} 1925 1926mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1927 Thread* self, size_t length) { 1928 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1929 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1930} 1931 1932mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1933 mirror::Class* klass) { 1934 DCHECK(klass != nullptr); 1935 1936 // For temporary classes we must wait for them to be retired. 1937 if (init_done_ && klass->IsTemp()) { 1938 CHECK(!klass->IsResolved()); 1939 if (klass->IsErroneous()) { 1940 ThrowEarlierClassFailure(klass); 1941 return nullptr; 1942 } 1943 StackHandleScope<1> hs(self); 1944 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1945 ObjectLock<mirror::Class> lock(self, h_class); 1946 // Loop and wait for the resolving thread to retire this class. 1947 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1948 lock.WaitIgnoringInterrupts(); 1949 } 1950 if (h_class->IsErroneous()) { 1951 ThrowEarlierClassFailure(h_class.Get()); 1952 return nullptr; 1953 } 1954 CHECK(h_class->IsRetired()); 1955 // Get the updated class from class table. 1956 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1957 } 1958 1959 // Wait for the class if it has not already been linked. 1960 if (!klass->IsResolved() && !klass->IsErroneous()) { 1961 StackHandleScope<1> hs(self); 1962 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1963 ObjectLock<mirror::Class> lock(self, h_class); 1964 // Check for circular dependencies between classes. 1965 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1966 ThrowClassCircularityError(h_class.Get()); 1967 h_class->SetStatus(mirror::Class::kStatusError, self); 1968 return nullptr; 1969 } 1970 // Wait for the pending initialization to complete. 1971 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1972 lock.WaitIgnoringInterrupts(); 1973 } 1974 } 1975 1976 if (klass->IsErroneous()) { 1977 ThrowEarlierClassFailure(klass); 1978 return nullptr; 1979 } 1980 // Return the loaded class. No exceptions should be pending. 1981 CHECK(klass->IsResolved()) << PrettyClass(klass); 1982 self->AssertNoPendingException(); 1983 return klass; 1984} 1985 1986typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry; 1987 1988// Search a collection of DexFiles for a descriptor 1989ClassPathEntry FindInClassPath(const char* descriptor, 1990 const std::vector<const DexFile*>& class_path) { 1991 for (size_t i = 0; i != class_path.size(); ++i) { 1992 const DexFile* dex_file = class_path[i]; 1993 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 1994 if (dex_class_def != nullptr) { 1995 return ClassPathEntry(dex_file, dex_class_def); 1996 } 1997 } 1998 // TODO: remove reinterpret_cast when issue with -std=gnu++0x host issue resolved 1999 return ClassPathEntry(static_cast<const DexFile*>(nullptr), 2000 static_cast<const DexFile::ClassDef*>(nullptr)); 2001} 2002 2003mirror::Class* ClassLinker::FindClassInPathClassLoader(ScopedObjectAccessAlreadyRunnable& soa, 2004 Thread* self, const char* descriptor, 2005 Handle<mirror::ClassLoader> class_loader) { 2006 if (class_loader->GetClass() != 2007 soa.Decode<mirror::Class*>(WellKnownClasses::dalvik_system_PathClassLoader) || 2008 class_loader->GetParent()->GetClass() != 2009 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_BootClassLoader)) { 2010 return nullptr; 2011 } 2012 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2013 // Check if this would be found in the parent boot class loader. 2014 if (pair.second != nullptr) { 2015 mirror::Class* klass = LookupClass(descriptor, nullptr); 2016 if (klass != nullptr) { 2017 return EnsureResolved(self, descriptor, klass); 2018 } 2019 klass = DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, 2020 *pair.second); 2021 if (klass != nullptr) { 2022 return klass; 2023 } 2024 CHECK(self->IsExceptionPending()) << descriptor; 2025 self->ClearException(); 2026 } else { 2027 // RegisterDexFile may allocate dex caches (and cause thread suspension). 2028 StackHandleScope<3> hs(self); 2029 // The class loader is a PathClassLoader which inherits from BaseDexClassLoader. 2030 // We need to get the DexPathList and loop through it. 2031 Handle<mirror::ArtField> cookie_field = 2032 hs.NewHandle(soa.DecodeField(WellKnownClasses::dalvik_system_DexFile_cookie)); 2033 Handle<mirror::ArtField> dex_file_field = 2034 hs.NewHandle( 2035 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList$Element_dexFile)); 2036 mirror::Object* dex_path_list = 2037 soa.DecodeField(WellKnownClasses::dalvik_system_PathClassLoader_pathList)-> 2038 GetObject(class_loader.Get()); 2039 if (dex_path_list != nullptr && dex_file_field.Get() != nullptr && 2040 cookie_field.Get() != nullptr) { 2041 // DexPathList has an array dexElements of Elements[] which each contain a dex file. 2042 mirror::Object* dex_elements_obj = 2043 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList_dexElements)-> 2044 GetObject(dex_path_list); 2045 // Loop through each dalvik.system.DexPathList$Element's dalvik.system.DexFile and look 2046 // at the mCookie which is a DexFile vector. 2047 if (dex_elements_obj != nullptr) { 2048 Handle<mirror::ObjectArray<mirror::Object>> dex_elements = 2049 hs.NewHandle(dex_elements_obj->AsObjectArray<mirror::Object>()); 2050 for (int32_t i = 0; i < dex_elements->GetLength(); ++i) { 2051 mirror::Object* element = dex_elements->GetWithoutChecks(i); 2052 if (element == nullptr) { 2053 // Should never happen, fall back to java code to throw a NPE. 2054 break; 2055 } 2056 mirror::Object* dex_file = dex_file_field->GetObject(element); 2057 if (dex_file != nullptr) { 2058 const uint64_t cookie = cookie_field->GetLong(dex_file); 2059 auto* dex_files = 2060 reinterpret_cast<std::vector<const DexFile*>*>(static_cast<uintptr_t>(cookie)); 2061 if (dex_files == nullptr) { 2062 // This should never happen so log a warning. 2063 LOG(WARNING) << "Null DexFile::mCookie for " << descriptor; 2064 break; 2065 } 2066 for (const DexFile* dex_file : *dex_files) { 2067 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 2068 if (dex_class_def != nullptr) { 2069 RegisterDexFile(*dex_file); 2070 mirror::Class* klass = 2071 DefineClass(descriptor, class_loader, *dex_file, *dex_class_def); 2072 if (klass == nullptr) { 2073 CHECK(self->IsExceptionPending()) << descriptor; 2074 self->ClearException(); 2075 return nullptr; 2076 } 2077 return klass; 2078 } 2079 } 2080 } 2081 } 2082 } 2083 } 2084 } 2085 return nullptr; 2086} 2087 2088mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 2089 Handle<mirror::ClassLoader> class_loader) { 2090 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 2091 DCHECK(self != nullptr); 2092 self->AssertNoPendingException(); 2093 if (descriptor[1] == '\0') { 2094 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 2095 // for primitive classes that aren't backed by dex files. 2096 return FindPrimitiveClass(descriptor[0]); 2097 } 2098 // Find the class in the loaded classes table. 2099 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 2100 if (klass != nullptr) { 2101 return EnsureResolved(self, descriptor, klass); 2102 } 2103 // Class is not yet loaded. 2104 if (descriptor[0] == '[') { 2105 return CreateArrayClass(self, descriptor, class_loader); 2106 } else if (class_loader.Get() == nullptr) { 2107 // The boot class loader, search the boot class path. 2108 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2109 if (pair.second != nullptr) { 2110 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 2111 } else { 2112 // The boot class loader is searched ahead of the application class loader, failures are 2113 // expected and will be wrapped in a ClassNotFoundException. Use the pre-allocated error to 2114 // trigger the chaining with a proper stack trace. 2115 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2116 self->SetException(ThrowLocation(), pre_allocated); 2117 return nullptr; 2118 } 2119 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 2120 // First try with the bootstrap class loader. 2121 if (class_loader.Get() != nullptr) { 2122 klass = LookupClass(descriptor, nullptr); 2123 if (klass != nullptr) { 2124 return EnsureResolved(self, descriptor, klass); 2125 } 2126 } 2127 // If the lookup failed search the boot class path. We don't perform a recursive call to avoid 2128 // a NoClassDefFoundError being allocated. 2129 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2130 if (pair.second != nullptr) { 2131 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 2132 } 2133 // Next try the compile time class path. 2134 const std::vector<const DexFile*>* class_path; 2135 { 2136 ScopedObjectAccessUnchecked soa(self); 2137 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 2138 soa.AddLocalReference<jobject>(class_loader.Get())); 2139 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 2140 } 2141 pair = FindInClassPath(descriptor, *class_path); 2142 if (pair.second != nullptr) { 2143 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 2144 } 2145 } else { 2146 ScopedObjectAccessUnchecked soa(self); 2147 mirror::Class* klass = FindClassInPathClassLoader(soa, self, descriptor, class_loader); 2148 if (klass != nullptr) { 2149 return klass; 2150 } 2151 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 2152 soa.AddLocalReference<jobject>(class_loader.Get())); 2153 std::string class_name_string(DescriptorToDot(descriptor)); 2154 ScopedLocalRef<jobject> result(soa.Env(), nullptr); 2155 { 2156 ScopedThreadStateChange tsc(self, kNative); 2157 ScopedLocalRef<jobject> class_name_object(soa.Env(), 2158 soa.Env()->NewStringUTF(class_name_string.c_str())); 2159 if (class_name_object.get() == nullptr) { 2160 DCHECK(self->IsExceptionPending()); // OOME. 2161 return nullptr; 2162 } 2163 CHECK(class_loader_object.get() != nullptr); 2164 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 2165 WellKnownClasses::java_lang_ClassLoader_loadClass, 2166 class_name_object.get())); 2167 } 2168 if (self->IsExceptionPending()) { 2169 // If the ClassLoader threw, pass that exception up. 2170 return nullptr; 2171 } else if (result.get() == nullptr) { 2172 // broken loader - throw NPE to be compatible with Dalvik 2173 ThrowNullPointerException(nullptr, StringPrintf("ClassLoader.loadClass returned null for %s", 2174 class_name_string.c_str()).c_str()); 2175 return nullptr; 2176 } else { 2177 // success, return mirror::Class* 2178 return soa.Decode<mirror::Class*>(result.get()); 2179 } 2180 } 2181 2182 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 2183 return nullptr; 2184} 2185 2186mirror::Class* ClassLinker::DefineClass(const char* descriptor, 2187 Handle<mirror::ClassLoader> class_loader, 2188 const DexFile& dex_file, 2189 const DexFile::ClassDef& dex_class_def) { 2190 Thread* self = Thread::Current(); 2191 StackHandleScope<3> hs(self); 2192 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2193 bool should_allocate = false; 2194 2195 // Load the class from the dex file. 2196 if (UNLIKELY(!init_done_)) { 2197 // finish up init of hand crafted class_roots_ 2198 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2199 klass.Assign(GetClassRoot(kJavaLangObject)); 2200 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2201 klass.Assign(GetClassRoot(kJavaLangClass)); 2202 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2203 klass.Assign(GetClassRoot(kJavaLangString)); 2204 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2205 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2206 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2207 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2208 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2209 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2210 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2211 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2212 } else { 2213 should_allocate = true; 2214 } 2215 } else { 2216 should_allocate = true; 2217 } 2218 2219 if (should_allocate) { 2220 // Allocate a class with the status of not ready. 2221 // Interface object should get the right size here. Regular class will 2222 // figure out the right size later and be replaced with one of the right 2223 // size when the class becomes resolved. 2224 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2225 } 2226 if (UNLIKELY(klass.Get() == nullptr)) { 2227 CHECK(self->IsExceptionPending()); // Expect an OOME. 2228 return nullptr; 2229 } 2230 klass->SetDexCache(FindDexCache(dex_file)); 2231 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 2232 ObjectLock<mirror::Class> lock(self, klass); 2233 if (self->IsExceptionPending()) { 2234 // An exception occured during load, set status to erroneous while holding klass' lock in case 2235 // notification is necessary. 2236 if (!klass->IsErroneous()) { 2237 klass->SetStatus(mirror::Class::kStatusError, self); 2238 } 2239 return nullptr; 2240 } 2241 klass->SetClinitThreadId(self->GetTid()); 2242 2243 // Add the newly loaded class to the loaded classes table. 2244 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 2245 if (existing != nullptr) { 2246 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2247 // this thread to block. 2248 return EnsureResolved(self, descriptor, existing); 2249 } 2250 2251 // Finish loading (if necessary) by finding parents 2252 CHECK(!klass->IsLoaded()); 2253 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2254 // Loading failed. 2255 if (!klass->IsErroneous()) { 2256 klass->SetStatus(mirror::Class::kStatusError, self); 2257 } 2258 return nullptr; 2259 } 2260 CHECK(klass->IsLoaded()); 2261 // Link the class (if necessary) 2262 CHECK(!klass->IsResolved()); 2263 // TODO: Use fast jobjects? 2264 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2265 2266 mirror::Class* new_class = nullptr; 2267 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2268 // Linking failed. 2269 if (!klass->IsErroneous()) { 2270 klass->SetStatus(mirror::Class::kStatusError, self); 2271 } 2272 return nullptr; 2273 } 2274 self->AssertNoPendingException(); 2275 CHECK(new_class != nullptr) << descriptor; 2276 CHECK(new_class->IsResolved()) << descriptor; 2277 2278 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2279 2280 /* 2281 * We send CLASS_PREPARE events to the debugger from here. The 2282 * definition of "preparation" is creating the static fields for a 2283 * class and initializing them to the standard default values, but not 2284 * executing any code (that comes later, during "initialization"). 2285 * 2286 * We did the static preparation in LinkClass. 2287 * 2288 * The class has been prepared and resolved but possibly not yet verified 2289 * at this point. 2290 */ 2291 Dbg::PostClassPrepare(new_class_h.Get()); 2292 2293 return new_class_h.Get(); 2294} 2295 2296uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2297 const DexFile::ClassDef& dex_class_def) { 2298 const byte* class_data = dex_file.GetClassData(dex_class_def); 2299 size_t num_ref = 0; 2300 size_t num_32 = 0; 2301 size_t num_64 = 0; 2302 if (class_data != nullptr) { 2303 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2304 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2305 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2306 char c = descriptor[0]; 2307 if (c == 'L' || c == '[') { 2308 num_ref++; 2309 } else if (c == 'J' || c == 'D') { 2310 num_64++; 2311 } else { 2312 num_32++; 2313 } 2314 } 2315 } 2316 return mirror::Class::ComputeClassSize(false, 0, num_32, num_64, num_ref); 2317} 2318 2319bool ClassLinker::FindOatClass(const DexFile& dex_file, 2320 uint16_t class_def_idx, 2321 OatFile::OatClass* oat_class) { 2322 DCHECK(oat_class != nullptr); 2323 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2324 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 2325 if (oat_dex_file == nullptr) { 2326 return false; 2327 } 2328 *oat_class = oat_dex_file->GetOatClass(class_def_idx); 2329 return true; 2330} 2331 2332static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2333 uint32_t method_idx) { 2334 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2335 const byte* class_data = dex_file.GetClassData(class_def); 2336 CHECK(class_data != nullptr); 2337 ClassDataItemIterator it(dex_file, class_data); 2338 // Skip fields 2339 while (it.HasNextStaticField()) { 2340 it.Next(); 2341 } 2342 while (it.HasNextInstanceField()) { 2343 it.Next(); 2344 } 2345 // Process methods 2346 size_t class_def_method_index = 0; 2347 while (it.HasNextDirectMethod()) { 2348 if (it.GetMemberIndex() == method_idx) { 2349 return class_def_method_index; 2350 } 2351 class_def_method_index++; 2352 it.Next(); 2353 } 2354 while (it.HasNextVirtualMethod()) { 2355 if (it.GetMemberIndex() == method_idx) { 2356 return class_def_method_index; 2357 } 2358 class_def_method_index++; 2359 it.Next(); 2360 } 2361 DCHECK(!it.HasNext()); 2362 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2363 return 0; 2364} 2365 2366bool ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, OatFile::OatMethod* oat_method) { 2367 DCHECK(oat_method != nullptr); 2368 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2369 // method for direct methods (or virtual methods made direct). 2370 mirror::Class* declaring_class = method->GetDeclaringClass(); 2371 size_t oat_method_index; 2372 if (method->IsStatic() || method->IsDirect()) { 2373 // Simple case where the oat method index was stashed at load time. 2374 oat_method_index = method->GetMethodIndex(); 2375 } else { 2376 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2377 // by search for its position in the declared virtual methods. 2378 oat_method_index = declaring_class->NumDirectMethods(); 2379 size_t end = declaring_class->NumVirtualMethods(); 2380 bool found = false; 2381 for (size_t i = 0; i < end; i++) { 2382 // Check method index instead of identity in case of duplicate method definitions. 2383 if (method->GetDexMethodIndex() == 2384 declaring_class->GetVirtualMethod(i)->GetDexMethodIndex()) { 2385 found = true; 2386 break; 2387 } 2388 oat_method_index++; 2389 } 2390 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2391 } 2392 DCHECK_EQ(oat_method_index, 2393 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2394 method->GetDeclaringClass()->GetDexClassDefIndex(), 2395 method->GetDexMethodIndex())); 2396 OatFile::OatClass oat_class; 2397 if (!FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2398 declaring_class->GetDexClassDefIndex(), 2399 &oat_class)) { 2400 return false; 2401 } 2402 2403 *oat_method = oat_class.GetOatMethod(oat_method_index); 2404 return true; 2405} 2406 2407// Special case to get oat code without overwriting a trampoline. 2408const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2409 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2410 if (method->IsProxyMethod()) { 2411 return GetQuickProxyInvokeHandler(); 2412 } 2413 OatFile::OatMethod oat_method; 2414 const void* result = nullptr; 2415 if (FindOatMethodFor(method, &oat_method)) { 2416 result = oat_method.GetQuickCode(); 2417 } 2418 2419 if (result == nullptr) { 2420 if (method->IsNative()) { 2421 // No code and native? Use generic trampoline. 2422 result = GetQuickGenericJniTrampoline(); 2423#if defined(ART_USE_PORTABLE_COMPILER) 2424 } else if (method->IsPortableCompiled()) { 2425 // No code? Do we expect portable code? 2426 result = GetQuickToPortableBridge(); 2427#endif 2428 } else { 2429 // No code? You must mean to go into the interpreter. 2430 result = GetQuickToInterpreterBridge(); 2431 } 2432 } 2433 return result; 2434} 2435 2436#if defined(ART_USE_PORTABLE_COMPILER) 2437const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2438 bool* have_portable_code) { 2439 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2440 *have_portable_code = false; 2441 if (method->IsProxyMethod()) { 2442 return GetPortableProxyInvokeHandler(); 2443 } 2444 OatFile::OatMethod oat_method; 2445 const void* result = nullptr; 2446 const void* quick_code = nullptr; 2447 if (FindOatMethodFor(method, &oat_method)) { 2448 result = oat_method.GetPortableCode(); 2449 quick_code = oat_method.GetQuickCode(); 2450 } 2451 2452 if (result == nullptr) { 2453 if (quick_code == nullptr) { 2454 // No code? You must mean to go into the interpreter. 2455 result = GetPortableToInterpreterBridge(); 2456 } else { 2457 // No code? But there's quick code, so use a bridge. 2458 result = GetPortableToQuickBridge(); 2459 } 2460 } else { 2461 *have_portable_code = true; 2462 } 2463 return result; 2464} 2465#endif 2466 2467const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2468 uint32_t method_idx) { 2469 OatFile::OatClass oat_class; 2470 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2471 return nullptr; 2472 } 2473 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2474 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2475} 2476 2477#if defined(ART_USE_PORTABLE_COMPILER) 2478const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2479 uint32_t method_idx) { 2480 OatFile::OatClass oat_class; 2481 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2482 return nullptr; 2483 } 2484 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2485 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2486} 2487#endif 2488 2489// Returns true if the method must run with interpreter, false otherwise. 2490static bool NeedsInterpreter( 2491 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2492 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2493 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2494 // No code: need interpreter. 2495 // May return true for native code, in the case of generic JNI 2496 // DCHECK(!method->IsNative()); 2497 return true; 2498 } 2499#ifdef ART_SEA_IR_MODE 2500 ScopedObjectAccess soa(Thread::Current()); 2501 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2502 LOG(INFO) << "Found " << PrettyMethod(method); 2503 return false; 2504 } 2505#endif 2506 // If interpreter mode is enabled, every method (except native and proxy) must 2507 // be run with interpreter. 2508 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2509 !method->IsNative() && !method->IsProxyMethod(); 2510} 2511 2512void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2513 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2514 if (klass->NumDirectMethods() == 0) { 2515 return; // No direct methods => no static methods. 2516 } 2517 Runtime* runtime = Runtime::Current(); 2518 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2519 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2520 return; // OAT file unavailable. 2521 } 2522 } 2523 2524 const DexFile& dex_file = klass->GetDexFile(); 2525 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2526 CHECK(dex_class_def != nullptr); 2527 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2528 // There should always be class data if there were direct methods. 2529 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2530 ClassDataItemIterator it(dex_file, class_data); 2531 // Skip fields 2532 while (it.HasNextStaticField()) { 2533 it.Next(); 2534 } 2535 while (it.HasNextInstanceField()) { 2536 it.Next(); 2537 } 2538 OatFile::OatClass oat_class; 2539 bool has_oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class); 2540 // Link the code of methods skipped by LinkCode. 2541 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2542 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2543 if (!method->IsStatic()) { 2544 // Only update static methods. 2545 continue; 2546 } 2547 const void* portable_code = nullptr; 2548 const void* quick_code = nullptr; 2549 if (has_oat_class) { 2550 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2551 portable_code = oat_method.GetPortableCode(); 2552 quick_code = oat_method.GetQuickCode(); 2553 } 2554 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2555 bool have_portable_code = false; 2556 if (enter_interpreter) { 2557 // Use interpreter entry point. 2558 // Check whether the method is native, in which case it's generic JNI. 2559 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2560 quick_code = GetQuickGenericJniTrampoline(); 2561#if defined(ART_USE_PORTABLE_COMPILER) 2562 portable_code = GetPortableToQuickBridge(); 2563#endif 2564 } else { 2565#if defined(ART_USE_PORTABLE_COMPILER) 2566 portable_code = GetPortableToInterpreterBridge(); 2567#endif 2568 quick_code = GetQuickToInterpreterBridge(); 2569 } 2570 } else { 2571#if defined(ART_USE_PORTABLE_COMPILER) 2572 if (portable_code == nullptr) { 2573 portable_code = GetPortableToQuickBridge(); 2574 } else { 2575 have_portable_code = true; 2576 } 2577 if (quick_code == nullptr) { 2578 quick_code = GetQuickToPortableBridge(); 2579 } 2580#else 2581 if (quick_code == nullptr) { 2582 quick_code = GetQuickToInterpreterBridge(); 2583 } 2584#endif 2585 } 2586 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2587 have_portable_code); 2588 } 2589 // Ignore virtual methods on the iterator. 2590} 2591 2592void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 2593 const DexFile& dex_file, uint32_t dex_method_index, 2594 uint32_t method_index) { 2595 if (Runtime::Current()->IsCompiler()) { 2596 // The following code only applies to a non-compiler runtime. 2597 return; 2598 } 2599 // Method shouldn't have already been linked. 2600 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2601#if defined(ART_USE_PORTABLE_COMPILER) 2602 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2603#endif 2604 if (oat_class != nullptr) { 2605 // Every kind of method should at least get an invoke stub from the oat_method. 2606 // non-abstract methods also get their code pointers. 2607 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2608 oat_method.LinkMethod(method.Get()); 2609 } 2610 2611 // Install entry point from interpreter. 2612 bool enter_interpreter = NeedsInterpreter(method.Get(), 2613 method->GetEntryPointFromQuickCompiledCode(), 2614#if defined(ART_USE_PORTABLE_COMPILER) 2615 method->GetEntryPointFromPortableCompiledCode()); 2616#else 2617 nullptr); 2618#endif 2619 if (enter_interpreter && !method->IsNative()) { 2620 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2621 } else { 2622 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2623 } 2624 2625 if (method->IsAbstract()) { 2626 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2627#if defined(ART_USE_PORTABLE_COMPILER) 2628 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2629#endif 2630 return; 2631 } 2632 2633 bool have_portable_code = false; 2634 if (method->IsStatic() && !method->IsConstructor()) { 2635 // For static methods excluding the class initializer, install the trampoline. 2636 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2637 // after initializing class (see ClassLinker::InitializeClass method). 2638 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2639#if defined(ART_USE_PORTABLE_COMPILER) 2640 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2641#endif 2642 } else if (enter_interpreter) { 2643 if (!method->IsNative()) { 2644 // Set entry point from compiled code if there's no code or in interpreter only mode. 2645 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2646#if defined(ART_USE_PORTABLE_COMPILER) 2647 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2648#endif 2649 } else { 2650 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2651#if defined(ART_USE_PORTABLE_COMPILER) 2652 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2653#endif 2654 } 2655#if defined(ART_USE_PORTABLE_COMPILER) 2656 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2657 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2658 have_portable_code = true; 2659 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2660#endif 2661 } else { 2662 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2663#if defined(ART_USE_PORTABLE_COMPILER) 2664 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2665#endif 2666 } 2667 2668 if (method->IsNative()) { 2669 // Unregistering restores the dlsym lookup stub. 2670 method->UnregisterNative(Thread::Current()); 2671 2672 if (enter_interpreter) { 2673 // We have a native method here without code. Then it should have either the GenericJni 2674 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2675 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2676 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2677 } 2678 } 2679 2680 // Allow instrumentation its chance to hijack code. 2681 Runtime* runtime = Runtime::Current(); 2682 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2683 method->GetEntryPointFromQuickCompiledCode(), 2684#if defined(ART_USE_PORTABLE_COMPILER) 2685 method->GetEntryPointFromPortableCompiledCode(), 2686#else 2687 nullptr, 2688#endif 2689 have_portable_code); 2690} 2691 2692void ClassLinker::LoadClass(const DexFile& dex_file, 2693 const DexFile::ClassDef& dex_class_def, 2694 Handle<mirror::Class> klass, 2695 mirror::ClassLoader* class_loader) { 2696 CHECK(klass.Get() != nullptr); 2697 CHECK(klass->GetDexCache() != nullptr); 2698 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2699 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2700 CHECK(descriptor != nullptr); 2701 2702 klass->SetClass(GetClassRoot(kJavaLangClass)); 2703 if (kUseBakerOrBrooksReadBarrier) { 2704 klass->AssertReadBarrierPointer(); 2705 } 2706 uint32_t access_flags = dex_class_def.GetJavaAccessFlags(); 2707 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2708 klass->SetAccessFlags(access_flags); 2709 klass->SetClassLoader(class_loader); 2710 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2711 klass->SetStatus(mirror::Class::kStatusIdx, nullptr); 2712 2713 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2714 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2715 2716 const byte* class_data = dex_file.GetClassData(dex_class_def); 2717 if (class_data == nullptr) { 2718 return; // no fields or methods - for example a marker interface 2719 } 2720 2721 OatFile::OatClass oat_class; 2722 if (Runtime::Current()->IsStarted() 2723 && !Runtime::Current()->UseCompileTimeClassPath() 2724 && FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class)) { 2725 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2726 } else { 2727 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2728 } 2729} 2730 2731void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2732 const byte* class_data, 2733 Handle<mirror::Class> klass, 2734 mirror::ClassLoader* class_loader, 2735 const OatFile::OatClass* oat_class) { 2736 // Load fields. 2737 ClassDataItemIterator it(dex_file, class_data); 2738 Thread* self = Thread::Current(); 2739 if (it.NumStaticFields() != 0) { 2740 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2741 if (UNLIKELY(statics == nullptr)) { 2742 CHECK(self->IsExceptionPending()); // OOME. 2743 return; 2744 } 2745 klass->SetSFields(statics); 2746 } 2747 if (it.NumInstanceFields() != 0) { 2748 mirror::ObjectArray<mirror::ArtField>* fields = 2749 AllocArtFieldArray(self, it.NumInstanceFields()); 2750 if (UNLIKELY(fields == nullptr)) { 2751 CHECK(self->IsExceptionPending()); // OOME. 2752 return; 2753 } 2754 klass->SetIFields(fields); 2755 } 2756 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2757 StackHandleScope<1> hs(self); 2758 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2759 if (UNLIKELY(sfield.Get() == nullptr)) { 2760 CHECK(self->IsExceptionPending()); // OOME. 2761 return; 2762 } 2763 klass->SetStaticField(i, sfield.Get()); 2764 LoadField(dex_file, it, klass, sfield); 2765 } 2766 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2767 StackHandleScope<1> hs(self); 2768 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2769 if (UNLIKELY(ifield.Get() == nullptr)) { 2770 CHECK(self->IsExceptionPending()); // OOME. 2771 return; 2772 } 2773 klass->SetInstanceField(i, ifield.Get()); 2774 LoadField(dex_file, it, klass, ifield); 2775 } 2776 2777 // Load methods. 2778 if (it.NumDirectMethods() != 0) { 2779 // TODO: append direct methods to class object 2780 mirror::ObjectArray<mirror::ArtMethod>* directs = 2781 AllocArtMethodArray(self, it.NumDirectMethods()); 2782 if (UNLIKELY(directs == nullptr)) { 2783 CHECK(self->IsExceptionPending()); // OOME. 2784 return; 2785 } 2786 klass->SetDirectMethods(directs); 2787 } 2788 if (it.NumVirtualMethods() != 0) { 2789 // TODO: append direct methods to class object 2790 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2791 AllocArtMethodArray(self, it.NumVirtualMethods()); 2792 if (UNLIKELY(virtuals == nullptr)) { 2793 CHECK(self->IsExceptionPending()); // OOME. 2794 return; 2795 } 2796 klass->SetVirtualMethods(virtuals); 2797 } 2798 size_t class_def_method_index = 0; 2799 uint32_t last_dex_method_index = DexFile::kDexNoIndex; 2800 size_t last_class_def_method_index = 0; 2801 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2802 StackHandleScope<1> hs(self); 2803 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2804 if (UNLIKELY(method.Get() == nullptr)) { 2805 CHECK(self->IsExceptionPending()); // OOME. 2806 return; 2807 } 2808 klass->SetDirectMethod(i, method.Get()); 2809 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2810 uint32_t it_method_index = it.GetMemberIndex(); 2811 if (last_dex_method_index == it_method_index) { 2812 // duplicate case 2813 method->SetMethodIndex(last_class_def_method_index); 2814 } else { 2815 method->SetMethodIndex(class_def_method_index); 2816 last_dex_method_index = it_method_index; 2817 last_class_def_method_index = class_def_method_index; 2818 } 2819 class_def_method_index++; 2820 } 2821 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2822 StackHandleScope<1> hs(self); 2823 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2824 if (UNLIKELY(method.Get() == nullptr)) { 2825 CHECK(self->IsExceptionPending()); // OOME. 2826 return; 2827 } 2828 klass->SetVirtualMethod(i, method.Get()); 2829 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2830 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2831 class_def_method_index++; 2832 } 2833 DCHECK(!it.HasNext()); 2834} 2835 2836void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2837 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2838 uint32_t field_idx = it.GetMemberIndex(); 2839 dst->SetDexFieldIndex(field_idx); 2840 dst->SetDeclaringClass(klass.Get()); 2841 dst->SetAccessFlags(it.GetFieldAccessFlags()); 2842} 2843 2844mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2845 const ClassDataItemIterator& it, 2846 Handle<mirror::Class> klass) { 2847 uint32_t dex_method_idx = it.GetMemberIndex(); 2848 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2849 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2850 2851 mirror::ArtMethod* dst = AllocArtMethod(self); 2852 if (UNLIKELY(dst == nullptr)) { 2853 CHECK(self->IsExceptionPending()); // OOME. 2854 return nullptr; 2855 } 2856 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2857 2858 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2859 dst->SetDexMethodIndex(dex_method_idx); 2860 dst->SetDeclaringClass(klass.Get()); 2861 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2862 2863 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2864 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2865 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2866 2867 uint32_t access_flags = it.GetMethodAccessFlags(); 2868 2869 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2870 // Set finalizable flag on declaring class. 2871 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2872 // Void return type. 2873 if (klass->GetClassLoader() != nullptr) { // All non-boot finalizer methods are flagged. 2874 klass->SetFinalizable(); 2875 } else { 2876 std::string temp; 2877 const char* klass_descriptor = klass->GetDescriptor(&temp); 2878 // The Enum class declares a "final" finalize() method to prevent subclasses from 2879 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2880 // subclasses, so we exclude it here. 2881 // We also want to avoid setting the flag on Object, where we know that finalize() is 2882 // empty. 2883 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2884 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2885 klass->SetFinalizable(); 2886 } 2887 } 2888 } 2889 } else if (method_name[0] == '<') { 2890 // Fix broken access flags for initializers. Bug 11157540. 2891 bool is_init = (strcmp("<init>", method_name) == 0); 2892 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2893 if (UNLIKELY(!is_init && !is_clinit)) { 2894 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2895 } else { 2896 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2897 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2898 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2899 access_flags |= kAccConstructor; 2900 } 2901 } 2902 } 2903 dst->SetAccessFlags(access_flags); 2904 2905 self->EndAssertNoThreadSuspension(old_cause); 2906 return dst; 2907} 2908 2909void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2910 Thread* self = Thread::Current(); 2911 StackHandleScope<1> hs(self); 2912 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2913 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 2914 << dex_file.GetLocation(); 2915 AppendToBootClassPath(dex_file, dex_cache); 2916} 2917 2918void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2919 Handle<mirror::DexCache> dex_cache) { 2920 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 2921 boot_class_path_.push_back(&dex_file); 2922 RegisterDexFile(dex_file, dex_cache); 2923} 2924 2925bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2926 dex_lock_.AssertSharedHeld(Thread::Current()); 2927 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2928 mirror::DexCache* dex_cache = GetDexCache(i); 2929 if (dex_cache->GetDexFile() == &dex_file) { 2930 return true; 2931 } 2932 } 2933 return false; 2934} 2935 2936bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2937 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2938 return IsDexFileRegisteredLocked(dex_file); 2939} 2940 2941void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2942 Handle<mirror::DexCache> dex_cache) { 2943 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2944 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 2945 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2946 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2947 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2948 dex_cache->SetDexFile(&dex_file); 2949 if (log_new_dex_caches_roots_) { 2950 // TODO: This is not safe if we can remove dex caches. 2951 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2952 } 2953} 2954 2955void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2956 Thread* self = Thread::Current(); 2957 { 2958 ReaderMutexLock mu(self, dex_lock_); 2959 if (IsDexFileRegisteredLocked(dex_file)) { 2960 return; 2961 } 2962 } 2963 // Don't alloc while holding the lock, since allocation may need to 2964 // suspend all threads and another thread may need the dex_lock_ to 2965 // get to a suspend point. 2966 StackHandleScope<1> hs(self); 2967 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2968 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 2969 << dex_file.GetLocation(); 2970 { 2971 WriterMutexLock mu(self, dex_lock_); 2972 if (IsDexFileRegisteredLocked(dex_file)) { 2973 return; 2974 } 2975 RegisterDexFileLocked(dex_file, dex_cache); 2976 } 2977} 2978 2979void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2980 Handle<mirror::DexCache> dex_cache) { 2981 WriterMutexLock mu(Thread::Current(), dex_lock_); 2982 RegisterDexFileLocked(dex_file, dex_cache); 2983} 2984 2985mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2986 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2987 // Search assuming unique-ness of dex file. 2988 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2989 mirror::DexCache* dex_cache = GetDexCache(i); 2990 if (dex_cache->GetDexFile() == &dex_file) { 2991 return dex_cache; 2992 } 2993 } 2994 // Search matching by location name. 2995 std::string location(dex_file.GetLocation()); 2996 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2997 mirror::DexCache* dex_cache = GetDexCache(i); 2998 if (dex_cache->GetDexFile()->GetLocation() == location) { 2999 return dex_cache; 3000 } 3001 } 3002 // Failure, dump diagnostic and abort. 3003 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3004 mirror::DexCache* dex_cache = GetDexCache(i); 3005 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 3006 } 3007 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 3008 return nullptr; 3009} 3010 3011void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 3012 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3013 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3014 mirror::DexCache* dex_cache = GetDexCache(i); 3015 dex_cache->Fixup(resolution_method); 3016 } 3017} 3018 3019mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 3020 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 3021 if (UNLIKELY(klass == nullptr)) { 3022 return nullptr; 3023 } 3024 return InitializePrimitiveClass(klass, type); 3025} 3026 3027mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 3028 Primitive::Type type) { 3029 CHECK(primitive_class != nullptr); 3030 // Must hold lock on object when initializing. 3031 Thread* self = Thread::Current(); 3032 StackHandleScope<1> hs(self); 3033 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 3034 ObjectLock<mirror::Class> lock(self, h_class); 3035 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 3036 primitive_class->SetPrimitiveType(type); 3037 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 3038 const char* descriptor = Primitive::Descriptor(type); 3039 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 3040 CHECK(existing == nullptr) << "InitPrimitiveClass(" << type << ") failed"; 3041 return primitive_class; 3042} 3043 3044// Create an array class (i.e. the class object for the array, not the 3045// array itself). "descriptor" looks like "[C" or "[[[[B" or 3046// "[Ljava/lang/String;". 3047// 3048// If "descriptor" refers to an array of primitives, look up the 3049// primitive type's internally-generated class object. 3050// 3051// "class_loader" is the class loader of the class that's referring to 3052// us. It's used to ensure that we're looking for the element type in 3053// the right context. It does NOT become the class loader for the 3054// array class; that always comes from the base element class. 3055// 3056// Returns nullptr with an exception raised on failure. 3057mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 3058 Handle<mirror::ClassLoader> class_loader) { 3059 // Identify the underlying component type 3060 CHECK_EQ('[', descriptor[0]); 3061 StackHandleScope<2> hs(self); 3062 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 3063 if (component_type.Get() == nullptr) { 3064 DCHECK(self->IsExceptionPending()); 3065 // We need to accept erroneous classes as component types. 3066 component_type.Assign(LookupClass(descriptor + 1, class_loader.Get())); 3067 if (component_type.Get() == nullptr) { 3068 DCHECK(self->IsExceptionPending()); 3069 return nullptr; 3070 } else { 3071 self->ClearException(); 3072 } 3073 } 3074 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 3075 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 3076 return nullptr; 3077 } 3078 // See if the component type is already loaded. Array classes are 3079 // always associated with the class loader of their underlying 3080 // element type -- an array of Strings goes with the loader for 3081 // java/lang/String -- so we need to look for it there. (The 3082 // caller should have checked for the existence of the class 3083 // before calling here, but they did so with *their* class loader, 3084 // not the component type's loader.) 3085 // 3086 // If we find it, the caller adds "loader" to the class' initiating 3087 // loader list, which should prevent us from going through this again. 3088 // 3089 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 3090 // are the same, because our caller (FindClass) just did the 3091 // lookup. (Even if we get this wrong we still have correct behavior, 3092 // because we effectively do this lookup again when we add the new 3093 // class to the hash table --- necessary because of possible races with 3094 // other threads.) 3095 if (class_loader.Get() != component_type->GetClassLoader()) { 3096 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 3097 if (new_class != nullptr) { 3098 return new_class; 3099 } 3100 } 3101 3102 // Fill out the fields in the Class. 3103 // 3104 // It is possible to execute some methods against arrays, because 3105 // all arrays are subclasses of java_lang_Object_, so we need to set 3106 // up a vtable. We can just point at the one in java_lang_Object_. 3107 // 3108 // Array classes are simple enough that we don't need to do a full 3109 // link step. 3110 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 3111 if (UNLIKELY(!init_done_)) { 3112 // Classes that were hand created, ie not by FindSystemClass 3113 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 3114 new_class.Assign(GetClassRoot(kClassArrayClass)); 3115 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 3116 new_class.Assign(GetClassRoot(kObjectArrayClass)); 3117 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 3118 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 3119 } else if (strcmp(descriptor, 3120 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 3121 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 3122 } else if (strcmp(descriptor, 3123 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 3124 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 3125 } else if (strcmp(descriptor, "[C") == 0) { 3126 new_class.Assign(GetClassRoot(kCharArrayClass)); 3127 } else if (strcmp(descriptor, "[I") == 0) { 3128 new_class.Assign(GetClassRoot(kIntArrayClass)); 3129 } 3130 } 3131 if (new_class.Get() == nullptr) { 3132 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 3133 if (new_class.Get() == nullptr) { 3134 return nullptr; 3135 } 3136 new_class->SetComponentType(component_type.Get()); 3137 } 3138 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 3139 DCHECK(new_class->GetComponentType() != nullptr); 3140 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 3141 new_class->SetSuperClass(java_lang_Object); 3142 new_class->SetVTable(java_lang_Object->GetVTable()); 3143 new_class->SetPrimitiveType(Primitive::kPrimNot); 3144 new_class->SetClassLoader(component_type->GetClassLoader()); 3145 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 3146 { 3147 StackHandleScope<mirror::Class::kImtSize> hs(self, 3148 Runtime::Current()->GetImtUnimplementedMethod()); 3149 new_class->PopulateEmbeddedImtAndVTable(&hs); 3150 } 3151 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 3152 // don't need to set new_class->SetObjectSize(..) 3153 // because Object::SizeOf delegates to Array::SizeOf 3154 3155 3156 // All arrays have java/lang/Cloneable and java/io/Serializable as 3157 // interfaces. We need to set that up here, so that stuff like 3158 // "instanceof" works right. 3159 // 3160 // Note: The GC could run during the call to FindSystemClass, 3161 // so we need to make sure the class object is GC-valid while we're in 3162 // there. Do this by clearing the interface list so the GC will just 3163 // think that the entries are null. 3164 3165 3166 // Use the single, global copies of "interfaces" and "iftable" 3167 // (remember not to free them for arrays). 3168 { 3169 mirror::IfTable* array_iftable = array_iftable_.Read(); 3170 CHECK(array_iftable != nullptr); 3171 new_class->SetIfTable(array_iftable); 3172 } 3173 3174 // Inherit access flags from the component type. 3175 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 3176 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 3177 access_flags &= kAccJavaFlagsMask; 3178 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 3179 // and remove "interface". 3180 access_flags |= kAccAbstract | kAccFinal; 3181 access_flags &= ~kAccInterface; 3182 3183 new_class->SetAccessFlags(access_flags); 3184 3185 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 3186 if (existing == nullptr) { 3187 return new_class.Get(); 3188 } 3189 // Another thread must have loaded the class after we 3190 // started but before we finished. Abandon what we've 3191 // done. 3192 // 3193 // (Yes, this happens.) 3194 3195 return existing; 3196} 3197 3198mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 3199 switch (type) { 3200 case 'B': 3201 return GetClassRoot(kPrimitiveByte); 3202 case 'C': 3203 return GetClassRoot(kPrimitiveChar); 3204 case 'D': 3205 return GetClassRoot(kPrimitiveDouble); 3206 case 'F': 3207 return GetClassRoot(kPrimitiveFloat); 3208 case 'I': 3209 return GetClassRoot(kPrimitiveInt); 3210 case 'J': 3211 return GetClassRoot(kPrimitiveLong); 3212 case 'S': 3213 return GetClassRoot(kPrimitiveShort); 3214 case 'Z': 3215 return GetClassRoot(kPrimitiveBoolean); 3216 case 'V': 3217 return GetClassRoot(kPrimitiveVoid); 3218 default: 3219 break; 3220 } 3221 std::string printable_type(PrintableChar(type)); 3222 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 3223 return nullptr; 3224} 3225 3226mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 3227 size_t hash) { 3228 if (VLOG_IS_ON(class_linker)) { 3229 mirror::DexCache* dex_cache = klass->GetDexCache(); 3230 std::string source; 3231 if (dex_cache != nullptr) { 3232 source += " from "; 3233 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3234 } 3235 LOG(INFO) << "Loaded class " << descriptor << source; 3236 } 3237 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3238 mirror::Class* existing = 3239 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3240 if (existing != nullptr) { 3241 return existing; 3242 } 3243 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == nullptr && 3244 dex_cache_image_class_lookup_required_) { 3245 // Check a class loaded with the system class loader matches one in the image if the class 3246 // is in the image. 3247 existing = LookupClassFromImage(descriptor); 3248 if (existing != nullptr) { 3249 CHECK(klass == existing); 3250 } 3251 } 3252 VerifyObject(klass); 3253 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3254 if (log_new_class_table_roots_) { 3255 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3256 } 3257 return nullptr; 3258} 3259 3260mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3261 size_t hash) { 3262 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3263 mirror::Class* existing = 3264 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3265 3266 if (existing == nullptr) { 3267 CHECK(klass->IsProxyClass()); 3268 return nullptr; 3269 } 3270 3271 CHECK_NE(existing, klass) << descriptor; 3272 CHECK(!existing->IsResolved()) << descriptor; 3273 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3274 3275 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3276 it != end && it->first == hash; ++it) { 3277 mirror::Class* klass = it->second.Read(); 3278 if (klass == existing) { 3279 class_table_.erase(it); 3280 break; 3281 } 3282 } 3283 3284 CHECK(!klass->IsTemp()) << descriptor; 3285 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3286 dex_cache_image_class_lookup_required_) { 3287 // Check a class loaded with the system class loader matches one in the image if the class 3288 // is in the image. 3289 existing = LookupClassFromImage(descriptor); 3290 if (existing != nullptr) { 3291 CHECK(klass == existing) << descriptor; 3292 } 3293 } 3294 VerifyObject(klass); 3295 3296 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3297 if (log_new_class_table_roots_) { 3298 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3299 } 3300 3301 return existing; 3302} 3303 3304bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 3305 size_t hash = Hash(descriptor); 3306 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3307 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3308 it != end && it->first == hash; 3309 ++it) { 3310 mirror::Class* klass = it->second.Read(); 3311 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3312 class_table_.erase(it); 3313 return true; 3314 } 3315 } 3316 return false; 3317} 3318 3319mirror::Class* ClassLinker::LookupClass(const char* descriptor, 3320 const mirror::ClassLoader* class_loader) { 3321 size_t hash = Hash(descriptor); 3322 { 3323 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3324 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3325 if (result != nullptr) { 3326 return result; 3327 } 3328 } 3329 if (class_loader != nullptr || !dex_cache_image_class_lookup_required_) { 3330 return nullptr; 3331 } else { 3332 // Lookup failed but need to search dex_caches_. 3333 mirror::Class* result = LookupClassFromImage(descriptor); 3334 if (result != nullptr) { 3335 InsertClass(descriptor, result, hash); 3336 } else { 3337 // Searching the image dex files/caches failed, we don't want to get into this situation 3338 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3339 // classes into the class table. 3340 constexpr uint32_t kMaxFailedDexCacheLookups = 1000; 3341 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3342 MoveImageClassesToClassTable(); 3343 } 3344 } 3345 return result; 3346 } 3347} 3348 3349mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3350 const mirror::ClassLoader* class_loader, 3351 size_t hash) { 3352 auto end = class_table_.end(); 3353 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3354 mirror::Class* klass = it->second.Read(); 3355 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3356 if (kIsDebugBuild) { 3357 // Check for duplicates in the table. 3358 for (++it; it != end && it->first == hash; ++it) { 3359 mirror::Class* klass2 = it->second.Read(); 3360 CHECK(!(klass2->GetClassLoader() == class_loader && 3361 klass2->DescriptorEquals(descriptor))) 3362 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3363 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3364 } 3365 } 3366 return klass; 3367 } 3368 } 3369 return nullptr; 3370} 3371 3372static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3373 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3374 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3375 CHECK(image != nullptr); 3376 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3377 return root->AsObjectArray<mirror::DexCache>(); 3378} 3379 3380void ClassLinker::MoveImageClassesToClassTable() { 3381 Thread* self = Thread::Current(); 3382 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3383 if (!dex_cache_image_class_lookup_required_) { 3384 return; // All dex cache classes are already in the class table. 3385 } 3386 const char* old_no_suspend_cause = 3387 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 3388 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3389 std::string temp; 3390 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3391 mirror::DexCache* dex_cache = dex_caches->Get(i); 3392 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3393 for (int32_t j = 0; j < types->GetLength(); j++) { 3394 mirror::Class* klass = types->Get(j); 3395 if (klass != nullptr) { 3396 DCHECK(klass->GetClassLoader() == nullptr); 3397 const char* descriptor = klass->GetDescriptor(&temp); 3398 size_t hash = Hash(descriptor); 3399 mirror::Class* existing = LookupClassFromTableLocked(descriptor, nullptr, hash); 3400 if (existing != nullptr) { 3401 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3402 << PrettyClassAndClassLoader(klass); 3403 } else { 3404 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3405 if (log_new_class_table_roots_) { 3406 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3407 } 3408 } 3409 } 3410 } 3411 } 3412 dex_cache_image_class_lookup_required_ = false; 3413 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3414} 3415 3416mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3417 Thread* self = Thread::Current(); 3418 const char* old_no_suspend_cause = 3419 self->StartAssertNoThreadSuspension("Image class lookup"); 3420 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3421 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3422 mirror::DexCache* dex_cache = dex_caches->Get(i); 3423 const DexFile* dex_file = dex_cache->GetDexFile(); 3424 // Try binary searching the string/type index. 3425 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3426 if (string_id != nullptr) { 3427 const DexFile::TypeId* type_id = 3428 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3429 if (type_id != nullptr) { 3430 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3431 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3432 if (klass != nullptr) { 3433 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3434 return klass; 3435 } 3436 } 3437 } 3438 } 3439 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3440 return nullptr; 3441} 3442 3443void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3444 result.clear(); 3445 if (dex_cache_image_class_lookup_required_) { 3446 MoveImageClassesToClassTable(); 3447 } 3448 size_t hash = Hash(descriptor); 3449 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3450 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3451 it != end && it->first == hash; ++it) { 3452 mirror::Class* klass = it->second.Read(); 3453 if (klass->DescriptorEquals(descriptor)) { 3454 result.push_back(klass); 3455 } 3456 } 3457} 3458 3459void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 3460 // TODO: assert that the monitor on the Class is held 3461 Thread* self = Thread::Current(); 3462 ObjectLock<mirror::Class> lock(self, klass); 3463 3464 // Don't attempt to re-verify if already sufficiently verified. 3465 if (klass->IsVerified()) { 3466 EnsurePreverifiedMethods(klass); 3467 return; 3468 } 3469 if (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler()) { 3470 return; 3471 } 3472 3473 // The class might already be erroneous, for example at compile time if we attempted to verify 3474 // this class as a parent to another. 3475 if (klass->IsErroneous()) { 3476 ThrowEarlierClassFailure(klass.Get()); 3477 return; 3478 } 3479 3480 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3481 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3482 } else { 3483 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3484 << PrettyClass(klass.Get()); 3485 CHECK(!Runtime::Current()->IsCompiler()); 3486 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3487 } 3488 3489 // Skip verification if disabled. 3490 if (!Runtime::Current()->IsVerificationEnabled()) { 3491 klass->SetStatus(mirror::Class::kStatusVerified, self); 3492 EnsurePreverifiedMethods(klass); 3493 return; 3494 } 3495 3496 // Verify super class. 3497 StackHandleScope<2> hs(self); 3498 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3499 if (super.Get() != nullptr) { 3500 // Acquire lock to prevent races on verifying the super class. 3501 ObjectLock<mirror::Class> lock(self, super); 3502 3503 if (!super->IsVerified() && !super->IsErroneous()) { 3504 VerifyClass(super); 3505 } 3506 if (!super->IsCompileTimeVerified()) { 3507 std::string error_msg( 3508 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3509 PrettyDescriptor(klass.Get()).c_str(), 3510 PrettyDescriptor(super.Get()).c_str())); 3511 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3512 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3513 if (cause.Get() != nullptr) { 3514 self->ClearException(); 3515 } 3516 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3517 if (cause.Get() != nullptr) { 3518 self->GetException(nullptr)->SetCause(cause.Get()); 3519 } 3520 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3521 if (Runtime::Current()->IsCompiler()) { 3522 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3523 } 3524 klass->SetStatus(mirror::Class::kStatusError, self); 3525 return; 3526 } 3527 } 3528 3529 // Try to use verification information from the oat file, otherwise do runtime verification. 3530 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3531 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3532 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3533 if (oat_file_class_status == mirror::Class::kStatusError) { 3534 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3535 << PrettyDescriptor(klass.Get()) << " in " 3536 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3537 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3538 PrettyDescriptor(klass.Get()).c_str()); 3539 klass->SetStatus(mirror::Class::kStatusError, self); 3540 return; 3541 } 3542 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3543 std::string error_msg; 3544 if (!preverified) { 3545 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 3546 Runtime::Current()->IsCompiler(), 3547 &error_msg); 3548 } 3549 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3550 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3551 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3552 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3553 << " because: " << error_msg; 3554 } 3555 self->AssertNoPendingException(); 3556 // Make sure all classes referenced by catch blocks are resolved. 3557 ResolveClassExceptionHandlerTypes(dex_file, klass); 3558 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3559 // Even though there were no verifier failures we need to respect whether the super-class 3560 // was verified or requiring runtime reverification. 3561 if (super.Get() == nullptr || super->IsVerified()) { 3562 klass->SetStatus(mirror::Class::kStatusVerified, self); 3563 } else { 3564 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3565 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3566 // Pretend a soft failure occured so that we don't consider the class verified below. 3567 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3568 } 3569 } else { 3570 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3571 // Soft failures at compile time should be retried at runtime. Soft 3572 // failures at runtime will be handled by slow paths in the generated 3573 // code. Set status accordingly. 3574 if (Runtime::Current()->IsCompiler()) { 3575 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3576 } else { 3577 klass->SetStatus(mirror::Class::kStatusVerified, self); 3578 // As this is a fake verified status, make sure the methods are _not_ marked preverified 3579 // later. 3580 klass->SetAccessFlags(klass->GetAccessFlags() | kAccPreverified); 3581 } 3582 } 3583 } else { 3584 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3585 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3586 << " because: " << error_msg; 3587 self->AssertNoPendingException(); 3588 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3589 klass->SetStatus(mirror::Class::kStatusError, self); 3590 } 3591 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3592 // Class is verified so we don't need to do any access check on its methods. 3593 // Let the interpreter know it by setting the kAccPreverified flag onto each 3594 // method. 3595 // Note: we're going here during compilation and at runtime. When we set the 3596 // kAccPreverified flag when compiling image classes, the flag is recorded 3597 // in the image and is set when loading the image. 3598 EnsurePreverifiedMethods(klass); 3599 } 3600} 3601 3602void ClassLinker::EnsurePreverifiedMethods(Handle<mirror::Class> klass) { 3603 if ((klass->GetAccessFlags() & kAccPreverified) == 0) { 3604 klass->SetPreverifiedFlagOnAllMethods(); 3605 klass->SetAccessFlags(klass->GetAccessFlags() | kAccPreverified); 3606 } 3607} 3608 3609bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3610 mirror::Class::Status& oat_file_class_status) { 3611 // If we're compiling, we can only verify the class using the oat file if 3612 // we are not compiling the image or if the class we're verifying is not part of 3613 // the app. In other words, we will only check for preverification of bootclasspath 3614 // classes. 3615 if (Runtime::Current()->IsCompiler()) { 3616 // Are we compiling the bootclasspath? 3617 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3618 return false; 3619 } 3620 // We are compiling an app (not the image). 3621 3622 // Is this an app class? (I.e. not a bootclasspath class) 3623 if (klass->GetClassLoader() != nullptr) { 3624 return false; 3625 } 3626 } 3627 3628 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 3629 // In case we run without an image there won't be a backing oat file. 3630 if (oat_dex_file == nullptr) { 3631 return false; 3632 } 3633 3634 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3635 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3636 if (oat_file_class_status == mirror::Class::kStatusVerified || 3637 oat_file_class_status == mirror::Class::kStatusInitialized) { 3638 return true; 3639 } 3640 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3641 // Compile time verification failed with a soft error. Compile time verification can fail 3642 // because we have incomplete type information. Consider the following: 3643 // class ... { 3644 // Foo x; 3645 // .... () { 3646 // if (...) { 3647 // v1 gets assigned a type of resolved class Foo 3648 // } else { 3649 // v1 gets assigned a type of unresolved class Bar 3650 // } 3651 // iput x = v1 3652 // } } 3653 // when we merge v1 following the if-the-else it results in Conflict 3654 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3655 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3656 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3657 // at compile time). 3658 return false; 3659 } 3660 if (oat_file_class_status == mirror::Class::kStatusError) { 3661 // Compile time verification failed with a hard error. This is caused by invalid instructions 3662 // in the class. These errors are unrecoverable. 3663 return false; 3664 } 3665 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3666 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3667 // not loading the class. 3668 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3669 // isn't a problem and this case shouldn't occur 3670 return false; 3671 } 3672 std::string temp; 3673 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3674 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3675 << klass->GetDescriptor(&temp); 3676 3677 return false; 3678} 3679 3680void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3681 Handle<mirror::Class> klass) { 3682 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3683 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3684 } 3685 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3686 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3687 } 3688} 3689 3690void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3691 mirror::ArtMethod* method) { 3692 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3693 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3694 if (code_item == nullptr) { 3695 return; // native or abstract method 3696 } 3697 if (code_item->tries_size_ == 0) { 3698 return; // nothing to process 3699 } 3700 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3701 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3702 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3703 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3704 CatchHandlerIterator iterator(handlers_ptr); 3705 for (; iterator.HasNext(); iterator.Next()) { 3706 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3707 // unresolved exception types will be ignored by exception delivery 3708 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3709 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3710 if (exception_type == nullptr) { 3711 DCHECK(Thread::Current()->IsExceptionPending()); 3712 Thread::Current()->ClearException(); 3713 } 3714 } 3715 } 3716 handlers_ptr = iterator.EndDataPointer(); 3717 } 3718} 3719 3720static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3721static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3722 Handle<mirror::ArtMethod> prototype); 3723 3724mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3725 jobjectArray interfaces, jobject loader, 3726 jobjectArray methods, jobjectArray throws) { 3727 Thread* self = soa.Self(); 3728 StackHandleScope<8> hs(self); 3729 Handle<mirror::Class> klass(hs.NewHandle( 3730 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3731 if (klass.Get() == nullptr) { 3732 CHECK(self->IsExceptionPending()); // OOME. 3733 return nullptr; 3734 } 3735 DCHECK(klass->GetClass() != nullptr); 3736 klass->SetObjectSize(sizeof(mirror::Proxy)); 3737 // Set the class access flags incl. preverified, so we do not try to set the flag on the methods. 3738 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal | kAccPreverified); 3739 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3740 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3741 klass->SetName(soa.Decode<mirror::String*>(name)); 3742 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3743 klass->SetDexCache(proxy_class->GetDexCache()); 3744 klass->SetStatus(mirror::Class::kStatusIdx, self); 3745 3746 // Instance fields are inherited, but we add a couple of static fields... 3747 { 3748 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3749 if (UNLIKELY(sfields == nullptr)) { 3750 CHECK(self->IsExceptionPending()); // OOME. 3751 return nullptr; 3752 } 3753 klass->SetSFields(sfields); 3754 } 3755 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3756 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3757 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3758 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3759 CHECK(self->IsExceptionPending()); // OOME. 3760 return nullptr; 3761 } 3762 klass->SetStaticField(0, interfaces_sfield.Get()); 3763 interfaces_sfield->SetDexFieldIndex(0); 3764 interfaces_sfield->SetDeclaringClass(klass.Get()); 3765 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3766 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3767 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3768 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3769 CHECK(self->IsExceptionPending()); // OOME. 3770 return nullptr; 3771 } 3772 klass->SetStaticField(1, throws_sfield.Get()); 3773 throws_sfield->SetDexFieldIndex(1); 3774 throws_sfield->SetDeclaringClass(klass.Get()); 3775 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3776 3777 // Proxies have 1 direct method, the constructor 3778 { 3779 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3780 if (UNLIKELY(directs == nullptr)) { 3781 CHECK(self->IsExceptionPending()); // OOME. 3782 return nullptr; 3783 } 3784 klass->SetDirectMethods(directs); 3785 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3786 if (UNLIKELY(constructor == nullptr)) { 3787 CHECK(self->IsExceptionPending()); // OOME. 3788 return nullptr; 3789 } 3790 klass->SetDirectMethod(0, constructor); 3791 } 3792 3793 // Create virtual method using specified prototypes. 3794 size_t num_virtual_methods = 3795 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3796 { 3797 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3798 num_virtual_methods); 3799 if (UNLIKELY(virtuals == nullptr)) { 3800 CHECK(self->IsExceptionPending()); // OOME. 3801 return nullptr; 3802 } 3803 klass->SetVirtualMethods(virtuals); 3804 } 3805 for (size_t i = 0; i < num_virtual_methods; ++i) { 3806 StackHandleScope<1> hs(self); 3807 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3808 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3809 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3810 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3811 if (UNLIKELY(clone == nullptr)) { 3812 CHECK(self->IsExceptionPending()); // OOME. 3813 return nullptr; 3814 } 3815 klass->SetVirtualMethod(i, clone); 3816 } 3817 3818 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3819 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3820 self->AssertNoPendingException(); 3821 3822 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3823 mirror::Class* new_class = nullptr; 3824 { 3825 // Must hold lock on object when resolved. 3826 ObjectLock<mirror::Class> resolution_lock(self, klass); 3827 // Link the fields and virtual methods, creating vtable and iftables 3828 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3829 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3830 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3831 klass->SetStatus(mirror::Class::kStatusError, self); 3832 return nullptr; 3833 } 3834 } 3835 3836 CHECK(klass->IsRetired()); 3837 CHECK_NE(klass.Get(), new_class); 3838 klass.Assign(new_class); 3839 3840 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3841 interfaces_sfield->SetObject<false>(klass.Get(), 3842 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3843 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3844 throws_sfield->SetObject<false>(klass.Get(), 3845 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3846 3847 { 3848 // Lock on klass is released. Lock new class object. 3849 ObjectLock<mirror::Class> initialization_lock(self, klass); 3850 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3851 } 3852 3853 // sanity checks 3854 if (kIsDebugBuild) { 3855 CHECK(klass->GetIFields() == nullptr); 3856 CheckProxyConstructor(klass->GetDirectMethod(0)); 3857 for (size_t i = 0; i < num_virtual_methods; ++i) { 3858 StackHandleScope<2> hs(self); 3859 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3860 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3861 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3862 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3863 CheckProxyMethod(virtual_method, prototype); 3864 } 3865 3866 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3867 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3868 decoded_name->ToModifiedUtf8().c_str())); 3869 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3870 3871 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3872 decoded_name->ToModifiedUtf8().c_str())); 3873 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3874 3875 CHECK_EQ(klass.Get()->GetInterfaces(), 3876 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3877 CHECK_EQ(klass.Get()->GetThrows(), 3878 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3879 } 3880 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3881 CHECK(existing == nullptr); 3882 return klass.Get(); 3883} 3884 3885std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3886 DCHECK(proxy_class->IsProxyClass()); 3887 mirror::String* name = proxy_class->GetName(); 3888 DCHECK(name != nullptr); 3889 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3890} 3891 3892mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3893 mirror::ArtMethod* proxy_method) { 3894 DCHECK(proxy_class->IsProxyClass()); 3895 DCHECK(proxy_method->IsProxyMethod()); 3896 // Locate the dex cache of the original interface/Object 3897 mirror::DexCache* dex_cache = nullptr; 3898 { 3899 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3900 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3901 mirror::DexCache* a_dex_cache = GetDexCache(i); 3902 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3903 dex_cache = a_dex_cache; 3904 break; 3905 } 3906 } 3907 } 3908 CHECK(dex_cache != nullptr); 3909 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3910 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3911 CHECK(resolved_method != nullptr); 3912 return resolved_method; 3913} 3914 3915 3916mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3917 Handle<mirror::Class> klass, 3918 mirror::Class* proxy_class) { 3919 // Create constructor for Proxy that must initialize h 3920 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3921 proxy_class->GetDirectMethods(); 3922 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3923 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3924 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 3925 // constructor method. 3926 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 3927 proxy_constructor); 3928 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3929 // code_ too) 3930 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3931 if (constructor == nullptr) { 3932 CHECK(self->IsExceptionPending()); // OOME. 3933 return nullptr; 3934 } 3935 // Make this constructor public and fix the class to be our Proxy version 3936 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3937 constructor->SetDeclaringClass(klass.Get()); 3938 return constructor; 3939} 3940 3941static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3942 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3943 CHECK(constructor->IsConstructor()); 3944 CHECK_STREQ(constructor->GetName(), "<init>"); 3945 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3946 "(Ljava/lang/reflect/InvocationHandler;)V"); 3947 DCHECK(constructor->IsPublic()); 3948} 3949 3950mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3951 Handle<mirror::Class> klass, 3952 Handle<mirror::ArtMethod> prototype) { 3953 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3954 // prototype method 3955 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3956 prototype.Get()); 3957 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3958 // as necessary 3959 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3960 if (UNLIKELY(method == nullptr)) { 3961 CHECK(self->IsExceptionPending()); // OOME. 3962 return nullptr; 3963 } 3964 3965 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3966 // the intersection of throw exceptions as defined in Proxy 3967 method->SetDeclaringClass(klass.Get()); 3968 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3969 3970 // At runtime the method looks like a reference and argument saving method, clone the code 3971 // related parameters from this method. 3972 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3973#if defined(ART_USE_PORTABLE_COMPILER) 3974 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3975#endif 3976 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3977 3978 return method; 3979} 3980 3981static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3982 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3983 // Basic sanity 3984 CHECK(!prototype->IsFinal()); 3985 CHECK(method->IsFinal()); 3986 CHECK(!method->IsAbstract()); 3987 3988 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3989 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3990 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3991 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 3992 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 3993 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3994 3995 MethodHelper mh(method); 3996 MethodHelper mh2(prototype); 3997 CHECK_STREQ(method->GetName(), prototype->GetName()); 3998 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3999 // More complex sanity - via dex cache 4000 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 4001} 4002 4003static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 4004 bool can_init_parents) 4005 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4006 if (can_init_statics && can_init_parents) { 4007 return true; 4008 } 4009 if (!can_init_statics) { 4010 // Check if there's a class initializer. 4011 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4012 if (clinit != nullptr) { 4013 return false; 4014 } 4015 // Check if there are encoded static values needing initialization. 4016 if (klass->NumStaticFields() != 0) { 4017 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4018 DCHECK(dex_class_def != nullptr); 4019 if (dex_class_def->static_values_off_ != 0) { 4020 return false; 4021 } 4022 } 4023 } 4024 if (!klass->IsInterface() && klass->HasSuperClass()) { 4025 mirror::Class* super_class = klass->GetSuperClass(); 4026 if (!can_init_parents && !super_class->IsInitialized()) { 4027 return false; 4028 } else { 4029 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 4030 return false; 4031 } 4032 } 4033 } 4034 return true; 4035} 4036 4037bool ClassLinker::IsInitialized() const { 4038 return init_done_; 4039} 4040 4041bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 4042 bool can_init_parents) { 4043 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 4044 4045 // Are we already initialized and therefore done? 4046 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 4047 // an initialized class will never change its state. 4048 if (klass->IsInitialized()) { 4049 return true; 4050 } 4051 4052 // Fast fail if initialization requires a full runtime. Not part of the JLS. 4053 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 4054 return false; 4055 } 4056 4057 Thread* self = Thread::Current(); 4058 uint64_t t0; 4059 { 4060 ObjectLock<mirror::Class> lock(self, klass); 4061 4062 // Re-check under the lock in case another thread initialized ahead of us. 4063 if (klass->IsInitialized()) { 4064 return true; 4065 } 4066 4067 // Was the class already found to be erroneous? Done under the lock to match the JLS. 4068 if (klass->IsErroneous()) { 4069 ThrowEarlierClassFailure(klass.Get()); 4070 return false; 4071 } 4072 4073 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 4074 4075 if (!klass->IsVerified()) { 4076 VerifyClass(klass); 4077 if (!klass->IsVerified()) { 4078 // We failed to verify, expect either the klass to be erroneous or verification failed at 4079 // compile time. 4080 if (klass->IsErroneous()) { 4081 CHECK(self->IsExceptionPending()); 4082 } else { 4083 CHECK(Runtime::Current()->IsCompiler()); 4084 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 4085 } 4086 return false; 4087 } else { 4088 self->AssertNoPendingException(); 4089 } 4090 } 4091 4092 // If the class is kStatusInitializing, either this thread is 4093 // initializing higher up the stack or another thread has beat us 4094 // to initializing and we need to wait. Either way, this 4095 // invocation of InitializeClass will not be responsible for 4096 // running <clinit> and will return. 4097 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4098 // Could have got an exception during verification. 4099 if (self->IsExceptionPending()) { 4100 return false; 4101 } 4102 // We caught somebody else in the act; was it us? 4103 if (klass->GetClinitThreadId() == self->GetTid()) { 4104 // Yes. That's fine. Return so we can continue initializing. 4105 return true; 4106 } 4107 // No. That's fine. Wait for another thread to finish initializing. 4108 return WaitForInitializeClass(klass, self, lock); 4109 } 4110 4111 if (!ValidateSuperClassDescriptors(klass)) { 4112 klass->SetStatus(mirror::Class::kStatusError, self); 4113 return false; 4114 } 4115 4116 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 4117 4118 // From here out other threads may observe that we're initializing and so changes of state 4119 // require the a notification. 4120 klass->SetClinitThreadId(self->GetTid()); 4121 klass->SetStatus(mirror::Class::kStatusInitializing, self); 4122 4123 t0 = NanoTime(); 4124 } 4125 4126 // Initialize super classes, must be done while initializing for the JLS. 4127 if (!klass->IsInterface() && klass->HasSuperClass()) { 4128 mirror::Class* super_class = klass->GetSuperClass(); 4129 if (!super_class->IsInitialized()) { 4130 CHECK(!super_class->IsInterface()); 4131 CHECK(can_init_parents); 4132 StackHandleScope<1> hs(self); 4133 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 4134 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 4135 if (!super_initialized) { 4136 // The super class was verified ahead of entering initializing, we should only be here if 4137 // the super class became erroneous due to initialization. 4138 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 4139 << "Super class initialization failed for " 4140 << PrettyDescriptor(handle_scope_super.Get()) 4141 << " that has unexpected status " << handle_scope_super->GetStatus() 4142 << "\nPending exception:\n" 4143 << (self->GetException(nullptr) != nullptr ? self->GetException(nullptr)->Dump() : ""); 4144 ObjectLock<mirror::Class> lock(self, klass); 4145 // Initialization failed because the super-class is erroneous. 4146 klass->SetStatus(mirror::Class::kStatusError, self); 4147 return false; 4148 } 4149 } 4150 } 4151 4152 if (klass->NumStaticFields() > 0) { 4153 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4154 CHECK(dex_class_def != nullptr); 4155 const DexFile& dex_file = klass->GetDexFile(); 4156 StackHandleScope<2> hs(self); 4157 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 4158 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 4159 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 4160 this, *dex_class_def); 4161 if (it.HasNext()) { 4162 CHECK(can_init_statics); 4163 // We reordered the fields, so we need to be able to map the 4164 // field indexes to the right fields. 4165 SafeMap<uint32_t, mirror::ArtField*> field_map; 4166 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 4167 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 4168 if (Runtime::Current()->IsActiveTransaction()) { 4169 it.ReadValueToField<true>(field_map.Get(i)); 4170 } else { 4171 it.ReadValueToField<false>(field_map.Get(i)); 4172 } 4173 } 4174 } 4175 } 4176 4177 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4178 if (clinit != nullptr) { 4179 CHECK(can_init_statics); 4180 JValue result; 4181 clinit->Invoke(self, nullptr, 0, &result, "V"); 4182 } 4183 4184 uint64_t t1 = NanoTime(); 4185 4186 bool success = true; 4187 { 4188 ObjectLock<mirror::Class> lock(self, klass); 4189 4190 if (self->IsExceptionPending()) { 4191 WrapExceptionInInitializer(); 4192 klass->SetStatus(mirror::Class::kStatusError, self); 4193 success = false; 4194 } else { 4195 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 4196 RuntimeStats* thread_stats = self->GetStats(); 4197 ++global_stats->class_init_count; 4198 ++thread_stats->class_init_count; 4199 global_stats->class_init_time_ns += (t1 - t0); 4200 thread_stats->class_init_time_ns += (t1 - t0); 4201 // Set the class as initialized except if failed to initialize static fields. 4202 klass->SetStatus(mirror::Class::kStatusInitialized, self); 4203 if (VLOG_IS_ON(class_linker)) { 4204 std::string temp; 4205 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 4206 klass->GetLocation(); 4207 } 4208 // Opportunistically set static method trampolines to their destination. 4209 FixupStaticTrampolines(klass.Get()); 4210 } 4211 } 4212 return success; 4213} 4214 4215bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 4216 ObjectLock<mirror::Class>& lock) 4217 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4218 while (true) { 4219 self->AssertNoPendingException(); 4220 CHECK(!klass->IsInitialized()); 4221 lock.WaitIgnoringInterrupts(); 4222 4223 // When we wake up, repeat the test for init-in-progress. If 4224 // there's an exception pending (only possible if 4225 // "interruptShouldThrow" was set), bail out. 4226 if (self->IsExceptionPending()) { 4227 WrapExceptionInInitializer(); 4228 klass->SetStatus(mirror::Class::kStatusError, self); 4229 return false; 4230 } 4231 // Spurious wakeup? Go back to waiting. 4232 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4233 continue; 4234 } 4235 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 4236 // Compile time initialization failed. 4237 return false; 4238 } 4239 if (klass->IsErroneous()) { 4240 // The caller wants an exception, but it was thrown in a 4241 // different thread. Synthesize one here. 4242 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 4243 PrettyDescriptor(klass.Get()).c_str()); 4244 return false; 4245 } 4246 if (klass->IsInitialized()) { 4247 return true; 4248 } 4249 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4250 << klass->GetStatus(); 4251 } 4252 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 4253} 4254 4255bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 4256 if (klass->IsInterface()) { 4257 return true; 4258 } 4259 // Begin with the methods local to the superclass. 4260 StackHandleScope<2> hs(Thread::Current()); 4261 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4262 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4263 if (klass->HasSuperClass() && 4264 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4265 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4266 mh.ChangeMethod(klass->GetVTableEntry(i)); 4267 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 4268 if (mh.GetMethod() != super_mh.GetMethod() && 4269 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4270 ThrowLinkageError(klass.Get(), 4271 "Class %s method %s resolves differently in superclass %s", 4272 PrettyDescriptor(klass.Get()).c_str(), 4273 PrettyMethod(mh.GetMethod()).c_str(), 4274 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4275 return false; 4276 } 4277 } 4278 } 4279 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4280 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4281 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4282 for (uint32_t j = 0; j < num_methods; ++j) { 4283 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4284 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4285 if (mh.GetMethod() != super_mh.GetMethod() && 4286 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4287 ThrowLinkageError(klass.Get(), 4288 "Class %s method %s resolves differently in interface %s", 4289 PrettyDescriptor(klass.Get()).c_str(), 4290 PrettyMethod(mh.GetMethod()).c_str(), 4291 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4292 return false; 4293 } 4294 } 4295 } 4296 } 4297 return true; 4298} 4299 4300bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 4301 bool can_init_parents) { 4302 DCHECK(c.Get() != nullptr); 4303 if (c->IsInitialized()) { 4304 EnsurePreverifiedMethods(c); 4305 return true; 4306 } 4307 const bool success = InitializeClass(c, can_init_fields, can_init_parents); 4308 Thread* self = Thread::Current(); 4309 if (!success) { 4310 if (can_init_fields && can_init_parents) { 4311 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4312 } 4313 } else { 4314 self->AssertNoPendingException(); 4315 } 4316 return success; 4317} 4318 4319void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 4320 mirror::Class* c, 4321 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 4322 const byte* class_data = dex_file.GetClassData(dex_class_def); 4323 ClassDataItemIterator it(dex_file, class_data); 4324 StackHandleScope<2> hs(Thread::Current()); 4325 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 4326 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 4327 CHECK(!kMovingFields); 4328 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 4329 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 4330 } 4331} 4332 4333void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4334 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4335 if (fields != nullptr) { 4336 for (int index = 0; index < fields->GetLength(); index ++) { 4337 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4338 fields->Get(index)->SetDeclaringClass(new_class); 4339 } 4340 } 4341 } 4342 4343 fields = new_class->GetSFields(); 4344 if (fields != nullptr) { 4345 for (int index = 0; index < fields->GetLength(); index ++) { 4346 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4347 fields->Get(index)->SetDeclaringClass(new_class); 4348 } 4349 } 4350 } 4351 4352 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4353 if (methods != nullptr) { 4354 for (int index = 0; index < methods->GetLength(); index ++) { 4355 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4356 methods->Get(index)->SetDeclaringClass(new_class); 4357 } 4358 } 4359 } 4360 4361 methods = new_class->GetVirtualMethods(); 4362 if (methods != nullptr) { 4363 for (int index = 0; index < methods->GetLength(); index ++) { 4364 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4365 methods->Get(index)->SetDeclaringClass(new_class); 4366 } 4367 } 4368 } 4369} 4370 4371bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4372 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4373 mirror::Class** new_class) { 4374 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4375 4376 if (!LinkSuperClass(klass)) { 4377 return false; 4378 } 4379 StackHandleScope<mirror::Class::kImtSize> imt_handle_scope( 4380 self, Runtime::Current()->GetImtUnimplementedMethod()); 4381 if (!LinkMethods(self, klass, interfaces, &imt_handle_scope)) { 4382 return false; 4383 } 4384 if (!LinkInstanceFields(klass)) { 4385 return false; 4386 } 4387 size_t class_size; 4388 if (!LinkStaticFields(klass, &class_size)) { 4389 return false; 4390 } 4391 CreateReferenceInstanceOffsets(klass); 4392 CreateReferenceStaticOffsets(klass); 4393 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4394 4395 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4396 // We don't need to retire this class as it has no embedded tables or it was created the 4397 // correct size during class linker initialization. 4398 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4399 4400 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4401 klass->PopulateEmbeddedImtAndVTable(&imt_handle_scope); 4402 } 4403 4404 // This will notify waiters on klass that saw the not yet resolved 4405 // class in the class_table_ during EnsureResolved. 4406 klass->SetStatus(mirror::Class::kStatusResolved, self); 4407 *new_class = klass.Get(); 4408 } else { 4409 CHECK(!klass->IsResolved()); 4410 // Retire the temporary class and create the correctly sized resolved class. 4411 *new_class = klass->CopyOf(self, class_size, &imt_handle_scope); 4412 if (UNLIKELY(*new_class == nullptr)) { 4413 CHECK(self->IsExceptionPending()); // Expect an OOME. 4414 klass->SetStatus(mirror::Class::kStatusError, self); 4415 return false; 4416 } 4417 4418 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4419 StackHandleScope<1> hs(self); 4420 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4421 ObjectLock<mirror::Class> lock(self, new_class_h); 4422 4423 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4424 4425 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4426 CHECK(existing == nullptr || existing == klass.Get()); 4427 4428 // This will notify waiters on temp class that saw the not yet resolved class in the 4429 // class_table_ during EnsureResolved. 4430 klass->SetStatus(mirror::Class::kStatusRetired, self); 4431 4432 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4433 // This will notify waiters on new_class that saw the not yet resolved 4434 // class in the class_table_ during EnsureResolved. 4435 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4436 } 4437 return true; 4438} 4439 4440bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4441 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4442 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4443 uint16_t super_class_idx = class_def.superclass_idx_; 4444 if (super_class_idx != DexFile::kDexNoIndex16) { 4445 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4446 if (super_class == nullptr) { 4447 DCHECK(Thread::Current()->IsExceptionPending()); 4448 return false; 4449 } 4450 // Verify 4451 if (!klass->CanAccess(super_class)) { 4452 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4453 PrettyDescriptor(super_class).c_str(), 4454 PrettyDescriptor(klass.Get()).c_str()); 4455 return false; 4456 } 4457 CHECK(super_class->IsResolved()); 4458 klass->SetSuperClass(super_class); 4459 } 4460 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4461 if (interfaces != nullptr) { 4462 for (size_t i = 0; i < interfaces->Size(); i++) { 4463 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4464 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4465 if (interface == nullptr) { 4466 DCHECK(Thread::Current()->IsExceptionPending()); 4467 return false; 4468 } 4469 // Verify 4470 if (!klass->CanAccess(interface)) { 4471 // TODO: the RI seemed to ignore this in my testing. 4472 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4473 PrettyDescriptor(interface).c_str(), 4474 PrettyDescriptor(klass.Get()).c_str()); 4475 return false; 4476 } 4477 } 4478 } 4479 // Mark the class as loaded. 4480 klass->SetStatus(mirror::Class::kStatusLoaded, nullptr); 4481 return true; 4482} 4483 4484bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4485 CHECK(!klass->IsPrimitive()); 4486 mirror::Class* super = klass->GetSuperClass(); 4487 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4488 if (super != nullptr) { 4489 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4490 return false; 4491 } 4492 return true; 4493 } 4494 if (super == nullptr) { 4495 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4496 PrettyDescriptor(klass.Get()).c_str()); 4497 return false; 4498 } 4499 // Verify 4500 if (super->IsFinal() || super->IsInterface()) { 4501 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4502 PrettyDescriptor(super).c_str(), 4503 PrettyDescriptor(klass.Get()).c_str(), 4504 super->IsFinal() ? "declared final" : "an interface"); 4505 return false; 4506 } 4507 if (!klass->CanAccess(super)) { 4508 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4509 PrettyDescriptor(super).c_str(), 4510 PrettyDescriptor(klass.Get()).c_str()); 4511 return false; 4512 } 4513 4514 // Inherit kAccClassIsFinalizable from the superclass in case this 4515 // class doesn't override finalize. 4516 if (super->IsFinalizable()) { 4517 klass->SetFinalizable(); 4518 } 4519 4520 // Inherit reference flags (if any) from the superclass. 4521 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4522 if (reference_flags != 0) { 4523 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4524 } 4525 // Disallow custom direct subclasses of java.lang.ref.Reference. 4526 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4527 ThrowLinkageError(klass.Get(), 4528 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4529 PrettyDescriptor(klass.Get()).c_str()); 4530 return false; 4531 } 4532 4533 if (kIsDebugBuild) { 4534 // Ensure super classes are fully resolved prior to resolving fields.. 4535 while (super != nullptr) { 4536 CHECK(super->IsResolved()); 4537 super = super->GetSuperClass(); 4538 } 4539 } 4540 return true; 4541} 4542 4543// Populate the class vtable and itable. Compute return type indices. 4544bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4545 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4546 StackHandleScope<mirror::Class::kImtSize>* out_imt) { 4547 if (klass->IsInterface()) { 4548 // No vtable. 4549 size_t count = klass->NumVirtualMethods(); 4550 if (!IsUint(16, count)) { 4551 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4552 return false; 4553 } 4554 for (size_t i = 0; i < count; ++i) { 4555 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4556 } 4557 } else if (!LinkVirtualMethods(self, klass)) { // Link virtual methods first. 4558 return false; 4559 } 4560 return LinkInterfaceMethods(self, klass, interfaces, out_imt); // Link interface method last. 4561} 4562 4563bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4564 const size_t num_virtual_methods = klass->NumVirtualMethods(); 4565 if (klass->HasSuperClass()) { 4566 const size_t super_vtable_length = klass->GetSuperClass()->GetVTableLength(); 4567 const size_t max_count = num_virtual_methods + super_vtable_length; 4568 size_t actual_count = super_vtable_length; 4569 StackHandleScope<2> hs(self); 4570 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4571 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4572 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4573 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4574 if (UNLIKELY(vtable.Get() == nullptr)) { 4575 CHECK(self->IsExceptionPending()); // OOME. 4576 return false; 4577 } 4578 for (size_t i = 0; i < super_vtable_length; i++) { 4579 vtable->SetWithoutChecks<false>(i, super_class->GetEmbeddedVTableEntry(i)); 4580 } 4581 } else { 4582 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4583 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4584 if (UNLIKELY(vtable.Get() == nullptr)) { 4585 CHECK(self->IsExceptionPending()); // OOME. 4586 return false; 4587 } 4588 } 4589 4590 // See if any of our virtual methods override the superclass. 4591 for (size_t i = 0; i < num_virtual_methods; ++i) { 4592 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4593 MethodProtoHelper local_helper(local_method); 4594 size_t j = 0; 4595 for (; j < actual_count; ++j) { 4596 mirror::ArtMethod* super_method = vtable->GetWithoutChecks(j); 4597 MethodProtoHelper super_helper(super_method); 4598 if (local_helper.HasSameNameAndSignature(super_helper)) { 4599 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4600 super_method->GetAccessFlags())) { 4601 if (super_method->IsFinal()) { 4602 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4603 PrettyMethod(local_method).c_str(), 4604 super_method->GetDeclaringClassDescriptor()); 4605 return false; 4606 } 4607 vtable->SetWithoutChecks<false>(j, local_method); 4608 local_method->SetMethodIndex(j); 4609 break; 4610 } 4611 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4612 << " would have incorrectly overridden the package-private method in " 4613 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4614 } 4615 } 4616 if (j == actual_count) { 4617 // Not overriding, append. 4618 vtable->SetWithoutChecks<false>(actual_count, local_method); 4619 local_method->SetMethodIndex(actual_count); 4620 ++actual_count; 4621 } 4622 } 4623 if (!IsUint(16, actual_count)) { 4624 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4625 return false; 4626 } 4627 // Shrink vtable if possible 4628 CHECK_LE(actual_count, max_count); 4629 if (actual_count < max_count) { 4630 vtable.Assign(vtable->CopyOf(self, actual_count)); 4631 if (UNLIKELY(vtable.Get() == nullptr)) { 4632 CHECK(self->IsExceptionPending()); // OOME. 4633 return false; 4634 } 4635 } 4636 klass->SetVTable(vtable.Get()); 4637 } else { 4638 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4639 if (!IsUint(16, num_virtual_methods)) { 4640 ThrowClassFormatError(klass.Get(), "Too many methods: %d", 4641 static_cast<int>(num_virtual_methods)); 4642 return false; 4643 } 4644 mirror::ObjectArray<mirror::ArtMethod>* vtable = AllocArtMethodArray(self, num_virtual_methods); 4645 if (UNLIKELY(vtable == nullptr)) { 4646 CHECK(self->IsExceptionPending()); // OOME. 4647 return false; 4648 } 4649 for (size_t i = 0; i < num_virtual_methods; ++i) { 4650 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4651 vtable->SetWithoutChecks<false>(i, virtual_method); 4652 virtual_method->SetMethodIndex(i & 0xFFFF); 4653 } 4654 klass->SetVTable(vtable); 4655 } 4656 return true; 4657} 4658 4659bool ClassLinker::LinkInterfaceMethods(Thread* self, Handle<mirror::Class> klass, 4660 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4661 StackHandleScope<mirror::Class::kImtSize>* out_imt) { 4662 StackHandleScope<2> hs(self); 4663 Runtime* const runtime = Runtime::Current(); 4664 const bool has_superclass = klass->HasSuperClass(); 4665 const size_t super_ifcount = has_superclass ? klass->GetSuperClass()->GetIfTableCount() : 0U; 4666 const bool have_interfaces = interfaces.Get() != nullptr; 4667 const size_t num_interfaces = 4668 have_interfaces ? interfaces->GetLength() : klass->NumDirectInterfaces(); 4669 if (num_interfaces == 0) { 4670 if (super_ifcount == 0) { 4671 // Class implements no interfaces. 4672 DCHECK_EQ(klass->GetIfTableCount(), 0); 4673 DCHECK(klass->GetIfTable() == nullptr); 4674 return true; 4675 } 4676 // Class implements same interfaces as parent, are any of these not marker interfaces? 4677 bool has_non_marker_interface = false; 4678 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4679 for (size_t i = 0; i < super_ifcount; ++i) { 4680 if (super_iftable->GetMethodArrayCount(i) > 0) { 4681 has_non_marker_interface = true; 4682 break; 4683 } 4684 } 4685 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4686 if (!has_non_marker_interface) { 4687 klass->SetIfTable(super_iftable); 4688 return true; 4689 } 4690 } 4691 size_t ifcount = super_ifcount + num_interfaces; 4692 for (size_t i = 0; i < num_interfaces; i++) { 4693 mirror::Class* interface = have_interfaces ? 4694 interfaces->GetWithoutChecks(i) : mirror::Class::GetDirectInterface(self, klass, i); 4695 DCHECK(interface != nullptr); 4696 if (UNLIKELY(!interface->IsInterface())) { 4697 std::string temp; 4698 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4699 PrettyDescriptor(klass.Get()).c_str(), 4700 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4701 return false; 4702 } 4703 ifcount += interface->GetIfTableCount(); 4704 } 4705 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4706 if (UNLIKELY(iftable.Get() == nullptr)) { 4707 CHECK(self->IsExceptionPending()); // OOME. 4708 return false; 4709 } 4710 if (super_ifcount != 0) { 4711 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4712 for (size_t i = 0; i < super_ifcount; i++) { 4713 mirror::Class* super_interface = super_iftable->GetInterface(i); 4714 iftable->SetInterface(i, super_interface); 4715 } 4716 } 4717 // Flatten the interface inheritance hierarchy. 4718 size_t idx = super_ifcount; 4719 for (size_t i = 0; i < num_interfaces; i++) { 4720 mirror::Class* interface = have_interfaces ? interfaces->Get(i) : 4721 mirror::Class::GetDirectInterface(self, klass, i); 4722 // Check if interface is already in iftable 4723 bool duplicate = false; 4724 for (size_t j = 0; j < idx; j++) { 4725 mirror::Class* existing_interface = iftable->GetInterface(j); 4726 if (existing_interface == interface) { 4727 duplicate = true; 4728 break; 4729 } 4730 } 4731 if (!duplicate) { 4732 // Add this non-duplicate interface. 4733 iftable->SetInterface(idx++, interface); 4734 // Add this interface's non-duplicate super-interfaces. 4735 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4736 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4737 bool super_duplicate = false; 4738 for (size_t k = 0; k < idx; k++) { 4739 mirror::Class* existing_interface = iftable->GetInterface(k); 4740 if (existing_interface == super_interface) { 4741 super_duplicate = true; 4742 break; 4743 } 4744 } 4745 if (!super_duplicate) { 4746 iftable->SetInterface(idx++, super_interface); 4747 } 4748 } 4749 } 4750 } 4751 // Shrink iftable in case duplicates were found 4752 if (idx < ifcount) { 4753 DCHECK_NE(num_interfaces, 0U); 4754 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4755 if (UNLIKELY(iftable.Get() == nullptr)) { 4756 CHECK(self->IsExceptionPending()); // OOME. 4757 return false; 4758 } 4759 ifcount = idx; 4760 } else { 4761 DCHECK_EQ(idx, ifcount); 4762 } 4763 klass->SetIfTable(iftable.Get()); 4764 // If we're an interface, we don't need the vtable pointers, so we're done. 4765 if (klass->IsInterface()) { 4766 return true; 4767 } 4768 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4769 hs.NewHandle(klass->GetVTableDuringLinking())); 4770 std::vector<mirror::ArtMethod*> miranda_list; 4771 // Copy the IMT from the super class if possible. 4772 bool extend_super_iftable = false; 4773 if (has_superclass) { 4774 mirror::Class* super_class = klass->GetSuperClass(); 4775 extend_super_iftable = true; 4776 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4777 for (size_t i = 0; i < mirror::Class::kImtSize; ++i) { 4778 out_imt->SetReference(i, super_class->GetEmbeddedImTableEntry(i)); 4779 } 4780 } else { 4781 // No imt in the super class, need to reconstruct from the iftable. 4782 mirror::IfTable* if_table = super_class->GetIfTable(); 4783 mirror::ArtMethod* conflict_method = runtime->GetImtConflictMethod(); 4784 const size_t length = super_class->GetIfTableCount(); 4785 for (size_t i = 0; i < length; ++i) { 4786 mirror::Class* interface = iftable->GetInterface(i); 4787 const size_t num_virtuals = interface->NumVirtualMethods(); 4788 const size_t method_array_count = if_table->GetMethodArrayCount(i); 4789 DCHECK_EQ(num_virtuals, method_array_count); 4790 if (method_array_count == 0) { 4791 continue; 4792 } 4793 mirror::ObjectArray<mirror::ArtMethod>* method_array = if_table->GetMethodArray(i); 4794 for (size_t j = 0; j < num_virtuals; ++j) { 4795 mirror::ArtMethod* method = method_array->GetWithoutChecks(j); 4796 if (method->IsMiranda()) { 4797 continue; 4798 } 4799 mirror::ArtMethod* interface_method = interface->GetVirtualMethod(j); 4800 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4801 mirror::ArtMethod* imt_ref = out_imt->GetReference(imt_index)->AsArtMethod(); 4802 if (imt_ref == runtime->GetImtUnimplementedMethod()) { 4803 out_imt->SetReference(imt_index, method); 4804 } else if (imt_ref != conflict_method) { 4805 out_imt->SetReference(imt_index, conflict_method); 4806 } 4807 } 4808 } 4809 } 4810 } 4811 for (size_t i = 0; i < ifcount; ++i) { 4812 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4813 if (num_methods > 0) { 4814 StackHandleScope<2> hs(self); 4815 const bool is_super = i < super_ifcount; 4816 const bool super_interface = is_super && extend_super_iftable; 4817 Handle<mirror::ObjectArray<mirror::ArtMethod>> method_array; 4818 Handle<mirror::ObjectArray<mirror::ArtMethod>> input_array; 4819 if (super_interface) { 4820 mirror::IfTable* if_table = klass->GetSuperClass()->GetIfTable(); 4821 DCHECK(if_table != nullptr); 4822 DCHECK(if_table->GetMethodArray(i) != nullptr); 4823 // If we are working on a super interface, try extending the existing method array. 4824 method_array = hs.NewHandle(if_table->GetMethodArray(i)->Clone(self)-> 4825 AsObjectArray<mirror::ArtMethod>()); 4826 // We are overwriting a super class interface, try to only virtual methods instead of the 4827 // whole vtable. 4828 input_array = hs.NewHandle(klass->GetVirtualMethods()); 4829 } else { 4830 method_array = hs.NewHandle(AllocArtMethodArray(self, num_methods)); 4831 // A new interface, we need the whole vtable incase a new interface method is implemented 4832 // in the whole superclass. 4833 input_array = vtable; 4834 } 4835 if (UNLIKELY(method_array.Get() == nullptr)) { 4836 CHECK(self->IsExceptionPending()); // OOME. 4837 return false; 4838 } 4839 iftable->SetMethodArray(i, method_array.Get()); 4840 if (input_array.Get() == nullptr) { 4841 // If the added virtual methods is empty, do nothing. 4842 DCHECK(super_interface); 4843 continue; 4844 } 4845 for (size_t j = 0; j < num_methods; ++j) { 4846 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 4847 MethodProtoHelper interface_helper(interface_method); 4848 int32_t k; 4849 // For each method listed in the interface's method list, find the 4850 // matching method in our class's method list. We want to favor the 4851 // subclass over the superclass, which just requires walking 4852 // back from the end of the vtable. (This only matters if the 4853 // superclass defines a private method and this class redefines 4854 // it -- otherwise it would use the same vtable slot. In .dex files 4855 // those don't end up in the virtual method table, so it shouldn't 4856 // matter which direction we go. We walk it backward anyway.) 4857 for (k = input_array->GetLength() - 1; k >= 0; --k) { 4858 mirror::ArtMethod* vtable_method = input_array->GetWithoutChecks(k); 4859 MethodProtoHelper vtable_helper(vtable_method); 4860 if (interface_helper.HasSameNameAndSignature(vtable_helper)) { 4861 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 4862 ThrowIllegalAccessError( 4863 klass.Get(), 4864 "Method '%s' implementing interface method '%s' is not public", 4865 PrettyMethod(vtable_method).c_str(), 4866 PrettyMethod(interface_method).c_str()); 4867 return false; 4868 } 4869 method_array->SetWithoutChecks<false>(j, vtable_method); 4870 // Place method in imt if entry is empty, place conflict otherwise. 4871 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4872 mirror::ArtMethod* imt_ref = out_imt->GetReference(imt_index)->AsArtMethod(); 4873 mirror::ArtMethod* conflict_method = runtime->GetImtConflictMethod(); 4874 if (imt_ref == runtime->GetImtUnimplementedMethod()) { 4875 out_imt->SetReference(imt_index, vtable_method); 4876 } else if (imt_ref != conflict_method) { 4877 // If we are not a conflict and we have the same signature and name as the imt entry, 4878 // it must be that we overwrote a superclass vtable entry. 4879 if (MethodProtoHelper(imt_ref).HasSameNameAndSignature(vtable_helper)) { 4880 out_imt->SetReference(imt_index, vtable_method); 4881 } else { 4882 out_imt->SetReference(imt_index, conflict_method); 4883 } 4884 } 4885 break; 4886 } 4887 } 4888 if (k < 0 && !super_interface) { 4889 mirror::ArtMethod* miranda_method = nullptr; 4890 for (mirror::ArtMethod* mir_method : miranda_list) { 4891 MethodProtoHelper vtable_helper(mir_method); 4892 if (interface_helper.HasSameNameAndSignature(vtable_helper)) { 4893 miranda_method = mir_method; 4894 break; 4895 } 4896 } 4897 if (miranda_method == nullptr) { 4898 // Point the interface table at a phantom slot. 4899 miranda_method = down_cast<mirror::ArtMethod*>(interface_method->Clone(self)); 4900 if (UNLIKELY(miranda_method == nullptr)) { 4901 CHECK(self->IsExceptionPending()); // OOME. 4902 return false; 4903 } 4904 // TODO: If a methods move then the miranda_list may hold stale references. 4905 miranda_list.push_back(miranda_method); 4906 } 4907 method_array->SetWithoutChecks<false>(j, miranda_method); 4908 } 4909 } 4910 } 4911 } 4912 if (!miranda_list.empty()) { 4913 int old_method_count = klass->NumVirtualMethods(); 4914 int new_method_count = old_method_count + miranda_list.size(); 4915 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4916 if (old_method_count == 0) { 4917 virtuals = AllocArtMethodArray(self, new_method_count); 4918 } else { 4919 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4920 } 4921 if (UNLIKELY(virtuals == nullptr)) { 4922 CHECK(self->IsExceptionPending()); // OOME. 4923 return false; 4924 } 4925 klass->SetVirtualMethods(virtuals); 4926 4927 int old_vtable_count = vtable->GetLength(); 4928 int new_vtable_count = old_vtable_count + miranda_list.size(); 4929 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4930 if (UNLIKELY(vtable.Get() == nullptr)) { 4931 CHECK(self->IsExceptionPending()); // OOME. 4932 return false; 4933 } 4934 for (size_t i = 0; i < miranda_list.size(); ++i) { 4935 mirror::ArtMethod* method = miranda_list[i]; 4936 // Leave the declaring class alone as type indices are relative to it 4937 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4938 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4939 klass->SetVirtualMethod(old_method_count + i, method); 4940 vtable->SetWithoutChecks<false>(old_vtable_count + i, method); 4941 } 4942 // TODO: do not assign to the vtable field until it is fully constructed. 4943 klass->SetVTable(vtable.Get()); 4944 } 4945 4946 if (kIsDebugBuild) { 4947 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4948 for (int i = 0; i < vtable->GetLength(); ++i) { 4949 CHECK(vtable->GetWithoutChecks(i) != nullptr); 4950 } 4951 } 4952 4953 return true; 4954} 4955 4956bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4957 CHECK(klass.Get() != nullptr); 4958 return LinkFields(klass, false, nullptr); 4959} 4960 4961bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass, size_t* class_size) { 4962 CHECK(klass.Get() != nullptr); 4963 return LinkFields(klass, true, class_size); 4964} 4965 4966struct LinkFieldsComparator { 4967 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4968 } 4969 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4970 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4971 NO_THREAD_SAFETY_ANALYSIS { 4972 // First come reference fields, then 64-bit, and finally 32-bit 4973 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4974 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4975 if (type1 != type2) { 4976 bool is_primitive1 = type1 != Primitive::kPrimNot; 4977 bool is_primitive2 = type2 != Primitive::kPrimNot; 4978 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4979 type1 == Primitive::kPrimDouble); 4980 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4981 type2 == Primitive::kPrimDouble); 4982 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4983 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4984 if (order1 != order2) { 4985 return order1 < order2; 4986 } 4987 } 4988 // same basic group? then sort by string. 4989 return strcmp(field1->GetName(), field2->GetName()) < 0; 4990 } 4991}; 4992 4993bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static, size_t* class_size) { 4994 size_t num_fields = 4995 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4996 4997 mirror::ObjectArray<mirror::ArtField>* fields = 4998 is_static ? klass->GetSFields() : klass->GetIFields(); 4999 5000 // Initialize field_offset 5001 MemberOffset field_offset(0); 5002 if (is_static) { 5003 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 5004 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 5005 // Static fields come after the embedded tables. 5006 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 5007 0, 0, 0); 5008 } 5009 field_offset = MemberOffset(base); 5010 } else { 5011 mirror::Class* super_class = klass->GetSuperClass(); 5012 if (super_class != nullptr) { 5013 CHECK(super_class->IsResolved()) 5014 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 5015 field_offset = MemberOffset(super_class->GetObjectSize()); 5016 } 5017 } 5018 5019 CHECK_EQ(num_fields == 0, fields == nullptr) << PrettyClass(klass.Get()); 5020 5021 // we want a relatively stable order so that adding new fields 5022 // minimizes disruption of C++ version such as Class and Method. 5023 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 5024 for (size_t i = 0; i < num_fields; i++) { 5025 mirror::ArtField* f = fields->Get(i); 5026 CHECK(f != nullptr) << PrettyClass(klass.Get()); 5027 grouped_and_sorted_fields.push_back(f); 5028 } 5029 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 5030 LinkFieldsComparator()); 5031 5032 // References should be at the front. 5033 size_t current_field = 0; 5034 size_t num_reference_fields = 0; 5035 for (; current_field < num_fields; current_field++) { 5036 mirror::ArtField* field = grouped_and_sorted_fields.front(); 5037 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5038 bool isPrimitive = type != Primitive::kPrimNot; 5039 if (isPrimitive) { 5040 break; // past last reference, move on to the next phase 5041 } 5042 grouped_and_sorted_fields.pop_front(); 5043 num_reference_fields++; 5044 fields->Set<false>(current_field, field); 5045 field->SetOffset(field_offset); 5046 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 5047 } 5048 5049 // Now we want to pack all of the double-wide fields together. If 5050 // we're not aligned, though, we want to shuffle one 32-bit field 5051 // into place. If we can't find one, we'll have to pad it. 5052 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 5053 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 5054 mirror::ArtField* field = grouped_and_sorted_fields[i]; 5055 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5056 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 5057 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 5058 continue; 5059 } 5060 fields->Set<false>(current_field++, field); 5061 field->SetOffset(field_offset); 5062 // drop the consumed field 5063 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 5064 break; 5065 } 5066 // whether we found a 32-bit field for padding or not, we advance 5067 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 5068 } 5069 5070 // Alignment is good, shuffle any double-wide fields forward, and 5071 // finish assigning field offsets to all fields. 5072 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 5073 << PrettyClass(klass.Get()); 5074 while (!grouped_and_sorted_fields.empty()) { 5075 mirror::ArtField* field = grouped_and_sorted_fields.front(); 5076 grouped_and_sorted_fields.pop_front(); 5077 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5078 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 5079 fields->Set<false>(current_field, field); 5080 field->SetOffset(field_offset); 5081 field_offset = MemberOffset(field_offset.Uint32Value() + 5082 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 5083 ? sizeof(uint64_t) 5084 : sizeof(uint32_t))); 5085 current_field++; 5086 } 5087 5088 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 5089 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 5090 // We know there are no non-reference fields in the Reference classes, and we know 5091 // that 'referent' is alphabetically last, so this is easy... 5092 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 5093 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 5094 --num_reference_fields; 5095 } 5096 5097 if (kIsDebugBuild) { 5098 // Make sure that all reference fields appear before 5099 // non-reference fields, and all double-wide fields are aligned. 5100 bool seen_non_ref = false; 5101 for (size_t i = 0; i < num_fields; i++) { 5102 mirror::ArtField* field = fields->Get(i); 5103 if (false) { // enable to debug field layout 5104 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 5105 << " class=" << PrettyClass(klass.Get()) 5106 << " field=" << PrettyField(field) 5107 << " offset=" 5108 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 5109 } 5110 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5111 bool is_primitive = type != Primitive::kPrimNot; 5112 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 5113 strcmp("referent", field->GetName()) == 0) { 5114 is_primitive = true; // We lied above, so we have to expect a lie here. 5115 } 5116 if (is_primitive) { 5117 if (!seen_non_ref) { 5118 seen_non_ref = true; 5119 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 5120 } 5121 } else { 5122 DCHECK(!seen_non_ref) << PrettyField(field); 5123 } 5124 } 5125 if (!seen_non_ref) { 5126 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 5127 } 5128 } 5129 5130 size_t size = field_offset.Uint32Value(); 5131 // Update klass 5132 if (is_static) { 5133 klass->SetNumReferenceStaticFields(num_reference_fields); 5134 *class_size = size; 5135 } else { 5136 klass->SetNumReferenceInstanceFields(num_reference_fields); 5137 if (!klass->IsVariableSize()) { 5138 std::string temp; 5139 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 5140 size_t previous_size = klass->GetObjectSize(); 5141 if (previous_size != 0) { 5142 // Make sure that we didn't originally have an incorrect size. 5143 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 5144 } 5145 klass->SetObjectSize(size); 5146 } 5147 } 5148 return true; 5149} 5150 5151// Set the bitmap of reference offsets, refOffsets, from the ifields 5152// list. 5153void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 5154 uint32_t reference_offsets = 0; 5155 mirror::Class* super_class = klass->GetSuperClass(); 5156 if (super_class != nullptr) { 5157 reference_offsets = super_class->GetReferenceInstanceOffsets(); 5158 // If our superclass overflowed, we don't stand a chance. 5159 if (reference_offsets == CLASS_WALK_SUPER) { 5160 klass->SetReferenceInstanceOffsets(reference_offsets); 5161 return; 5162 } 5163 } 5164 CreateReferenceOffsets(klass, false, reference_offsets); 5165} 5166 5167void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 5168 CreateReferenceOffsets(klass, true, 0); 5169} 5170 5171void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 5172 uint32_t reference_offsets) { 5173 size_t num_reference_fields = 5174 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 5175 : klass->NumReferenceInstanceFieldsDuringLinking(); 5176 mirror::ObjectArray<mirror::ArtField>* fields = 5177 is_static ? klass->GetSFields() : klass->GetIFields(); 5178 // All of the fields that contain object references are guaranteed 5179 // to be at the beginning of the fields list. 5180 for (size_t i = 0; i < num_reference_fields; ++i) { 5181 // Note that byte_offset is the offset from the beginning of 5182 // object, not the offset into instance data 5183 mirror::ArtField* field = fields->Get(i); 5184 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 5185 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 5186 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 5187 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 5188 CHECK_NE(new_bit, 0U); 5189 reference_offsets |= new_bit; 5190 } else { 5191 reference_offsets = CLASS_WALK_SUPER; 5192 break; 5193 } 5194 } 5195 // Update fields in klass 5196 if (is_static) { 5197 klass->SetReferenceStaticOffsets(reference_offsets); 5198 } else { 5199 klass->SetReferenceInstanceOffsets(reference_offsets); 5200 } 5201} 5202 5203mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 5204 Handle<mirror::DexCache> dex_cache) { 5205 DCHECK(dex_cache.Get() != nullptr); 5206 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 5207 if (resolved != nullptr) { 5208 return resolved; 5209 } 5210 uint32_t utf16_length; 5211 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 5212 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 5213 dex_cache->SetResolvedString(string_idx, string); 5214 return string; 5215} 5216 5217mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5218 mirror::Class* referrer) { 5219 StackHandleScope<2> hs(Thread::Current()); 5220 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 5221 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 5222 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 5223} 5224 5225mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5226 Handle<mirror::DexCache> dex_cache, 5227 Handle<mirror::ClassLoader> class_loader) { 5228 DCHECK(dex_cache.Get() != nullptr); 5229 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 5230 if (resolved == nullptr) { 5231 Thread* self = Thread::Current(); 5232 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 5233 resolved = FindClass(self, descriptor, class_loader); 5234 if (resolved != nullptr) { 5235 // TODO: we used to throw here if resolved's class loader was not the 5236 // boot class loader. This was to permit different classes with the 5237 // same name to be loaded simultaneously by different loaders 5238 dex_cache->SetResolvedType(type_idx, resolved); 5239 } else { 5240 CHECK(self->IsExceptionPending()) 5241 << "Expected pending exception for failed resolution of: " << descriptor; 5242 // Convert a ClassNotFoundException to a NoClassDefFoundError. 5243 StackHandleScope<1> hs(self); 5244 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 5245 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 5246 DCHECK(resolved == nullptr); // No Handle needed to preserve resolved. 5247 self->ClearException(); 5248 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 5249 self->GetException(nullptr)->SetCause(cause.Get()); 5250 } 5251 } 5252 } 5253 DCHECK((resolved == nullptr) || resolved->IsResolved() || resolved->IsErroneous()) 5254 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 5255 return resolved; 5256} 5257 5258mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 5259 Handle<mirror::DexCache> dex_cache, 5260 Handle<mirror::ClassLoader> class_loader, 5261 Handle<mirror::ArtMethod> referrer, 5262 InvokeType type) { 5263 DCHECK(dex_cache.Get() != nullptr); 5264 // Check for hit in the dex cache. 5265 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 5266 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 5267 return resolved; 5268 } 5269 // Fail, get the declaring class. 5270 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5271 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 5272 if (klass == nullptr) { 5273 DCHECK(Thread::Current()->IsExceptionPending()); 5274 return nullptr; 5275 } 5276 // Scan using method_idx, this saves string compares but will only hit for matching dex 5277 // caches/files. 5278 switch (type) { 5279 case kDirect: // Fall-through. 5280 case kStatic: 5281 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5282 break; 5283 case kInterface: 5284 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5285 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5286 break; 5287 case kSuper: // Fall-through. 5288 case kVirtual: 5289 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5290 break; 5291 default: 5292 LOG(FATAL) << "Unreachable - invocation type: " << type; 5293 } 5294 if (resolved == nullptr) { 5295 // Search by name, which works across dex files. 5296 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5297 const Signature signature = dex_file.GetMethodSignature(method_id); 5298 switch (type) { 5299 case kDirect: // Fall-through. 5300 case kStatic: 5301 resolved = klass->FindDirectMethod(name, signature); 5302 break; 5303 case kInterface: 5304 resolved = klass->FindInterfaceMethod(name, signature); 5305 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5306 break; 5307 case kSuper: // Fall-through. 5308 case kVirtual: 5309 resolved = klass->FindVirtualMethod(name, signature); 5310 break; 5311 } 5312 } 5313 // If we found a method, check for incompatible class changes. 5314 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5315 // Be a good citizen and update the dex cache to speed subsequent calls. 5316 dex_cache->SetResolvedMethod(method_idx, resolved); 5317 return resolved; 5318 } else { 5319 // If we had a method, it's an incompatible-class-change error. 5320 if (resolved != nullptr) { 5321 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5322 } else { 5323 // We failed to find the method which means either an access error, an incompatible class 5324 // change, or no such method. First try to find the method among direct and virtual methods. 5325 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5326 const Signature signature = dex_file.GetMethodSignature(method_id); 5327 switch (type) { 5328 case kDirect: 5329 case kStatic: 5330 resolved = klass->FindVirtualMethod(name, signature); 5331 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5332 // have had a resolved method before, which triggers the "true" branch above. 5333 break; 5334 case kInterface: 5335 case kVirtual: 5336 case kSuper: 5337 resolved = klass->FindDirectMethod(name, signature); 5338 break; 5339 } 5340 5341 // If we found something, check that it can be accessed by the referrer. 5342 if (resolved != nullptr && referrer.Get() != nullptr) { 5343 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5344 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5345 if (!referring_class->CanAccess(methods_class)) { 5346 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5347 resolved, type); 5348 return nullptr; 5349 } else if (!referring_class->CanAccessMember(methods_class, 5350 resolved->GetAccessFlags())) { 5351 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5352 return nullptr; 5353 } 5354 } 5355 5356 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 5357 // methods and throw if we find the method there. If we find nothing, throw a 5358 // NoSuchMethodError. 5359 switch (type) { 5360 case kDirect: 5361 case kStatic: 5362 if (resolved != nullptr) { 5363 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5364 } else { 5365 resolved = klass->FindInterfaceMethod(name, signature); 5366 if (resolved != nullptr) { 5367 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5368 } else { 5369 ThrowNoSuchMethodError(type, klass, name, signature); 5370 } 5371 } 5372 break; 5373 case kInterface: 5374 if (resolved != nullptr) { 5375 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5376 } else { 5377 resolved = klass->FindVirtualMethod(name, signature); 5378 if (resolved != nullptr) { 5379 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5380 } else { 5381 ThrowNoSuchMethodError(type, klass, name, signature); 5382 } 5383 } 5384 break; 5385 case kSuper: 5386 if (resolved != nullptr) { 5387 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5388 } else { 5389 ThrowNoSuchMethodError(type, klass, name, signature); 5390 } 5391 break; 5392 case kVirtual: 5393 if (resolved != nullptr) { 5394 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5395 } else { 5396 resolved = klass->FindInterfaceMethod(name, signature); 5397 if (resolved != nullptr) { 5398 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5399 } else { 5400 ThrowNoSuchMethodError(type, klass, name, signature); 5401 } 5402 } 5403 break; 5404 } 5405 } 5406 DCHECK(Thread::Current()->IsExceptionPending()); 5407 return nullptr; 5408 } 5409} 5410 5411mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5412 Handle<mirror::DexCache> dex_cache, 5413 Handle<mirror::ClassLoader> class_loader, 5414 bool is_static) { 5415 DCHECK(dex_cache.Get() != nullptr); 5416 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5417 if (resolved != nullptr) { 5418 return resolved; 5419 } 5420 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5421 Thread* const self = Thread::Current(); 5422 StackHandleScope<1> hs(self); 5423 Handle<mirror::Class> klass( 5424 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5425 if (klass.Get() == nullptr) { 5426 DCHECK(Thread::Current()->IsExceptionPending()); 5427 return nullptr; 5428 } 5429 5430 if (is_static) { 5431 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5432 } else { 5433 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5434 } 5435 5436 if (resolved == nullptr) { 5437 const char* name = dex_file.GetFieldName(field_id); 5438 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5439 if (is_static) { 5440 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5441 } else { 5442 resolved = klass->FindInstanceField(name, type); 5443 } 5444 if (resolved == nullptr) { 5445 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5446 return nullptr; 5447 } 5448 } 5449 dex_cache->SetResolvedField(field_idx, resolved); 5450 return resolved; 5451} 5452 5453mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5454 uint32_t field_idx, 5455 Handle<mirror::DexCache> dex_cache, 5456 Handle<mirror::ClassLoader> class_loader) { 5457 DCHECK(dex_cache.Get() != nullptr); 5458 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5459 if (resolved != nullptr) { 5460 return resolved; 5461 } 5462 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5463 Thread* self = Thread::Current(); 5464 StackHandleScope<1> hs(self); 5465 Handle<mirror::Class> klass( 5466 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5467 if (klass.Get() == nullptr) { 5468 DCHECK(Thread::Current()->IsExceptionPending()); 5469 return nullptr; 5470 } 5471 5472 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5473 StringPiece type(dex_file.StringDataByIdx( 5474 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5475 resolved = mirror::Class::FindField(self, klass, name, type); 5476 if (resolved != nullptr) { 5477 dex_cache->SetResolvedField(field_idx, resolved); 5478 } else { 5479 ThrowNoSuchFieldError("", klass.Get(), type, name); 5480 } 5481 return resolved; 5482} 5483 5484const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5485 uint32_t* length) { 5486 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5487 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5488 const DexFile& dex_file = *dex_cache->GetDexFile(); 5489 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5490 return dex_file.GetMethodShorty(method_id, length); 5491} 5492 5493void ClassLinker::DumpAllClasses(int flags) { 5494 if (dex_cache_image_class_lookup_required_) { 5495 MoveImageClassesToClassTable(); 5496 } 5497 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5498 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5499 std::vector<mirror::Class*> all_classes; 5500 { 5501 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5502 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5503 mirror::Class* klass = it.second.Read(); 5504 all_classes.push_back(klass); 5505 } 5506 } 5507 5508 for (size_t i = 0; i < all_classes.size(); ++i) { 5509 all_classes[i]->DumpClass(std::cerr, flags); 5510 } 5511} 5512 5513void ClassLinker::DumpForSigQuit(std::ostream& os) { 5514 if (dex_cache_image_class_lookup_required_) { 5515 MoveImageClassesToClassTable(); 5516 } 5517 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5518 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5519} 5520 5521size_t ClassLinker::NumLoadedClasses() { 5522 if (dex_cache_image_class_lookup_required_) { 5523 MoveImageClassesToClassTable(); 5524 } 5525 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5526 return class_table_.size(); 5527} 5528 5529pid_t ClassLinker::GetClassesLockOwner() { 5530 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5531} 5532 5533pid_t ClassLinker::GetDexLockOwner() { 5534 return dex_lock_.GetExclusiveOwnerTid(); 5535} 5536 5537void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5538 DCHECK(!init_done_); 5539 5540 DCHECK(klass != nullptr); 5541 DCHECK(klass->GetClassLoader() == nullptr); 5542 5543 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5544 DCHECK(class_roots != nullptr); 5545 DCHECK(class_roots->Get(class_root) == nullptr); 5546 class_roots->Set<false>(class_root, klass); 5547} 5548 5549} // namespace art 5550