class_linker.cc revision 9cb8d7a9a5013dd1e6734d9643573a4750d869e2
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <fcntl.h> 20#include <sys/file.h> 21#include <sys/stat.h> 22#include <deque> 23#include <memory> 24#include <string> 25#include <utility> 26#include <vector> 27 28#include "base/casts.h" 29#include "base/logging.h" 30#include "base/scoped_flock.h" 31#include "base/stl_util.h" 32#include "base/unix_file/fd_file.h" 33#include "class_linker-inl.h" 34#include "compiler_callbacks.h" 35#include "debugger.h" 36#include "dex_file-inl.h" 37#include "gc_root-inl.h" 38#include "gc/accounting/card_table-inl.h" 39#include "gc/accounting/heap_bitmap.h" 40#include "gc/heap.h" 41#include "gc/space/image_space.h" 42#include "handle_scope.h" 43#include "intern_table.h" 44#include "interpreter/interpreter.h" 45#include "leb128.h" 46#include "method_helper-inl.h" 47#include "oat.h" 48#include "oat_file.h" 49#include "object_lock.h" 50#include "mirror/art_field-inl.h" 51#include "mirror/art_method-inl.h" 52#include "mirror/class.h" 53#include "mirror/class-inl.h" 54#include "mirror/class_loader.h" 55#include "mirror/dex_cache-inl.h" 56#include "mirror/iftable-inl.h" 57#include "mirror/object-inl.h" 58#include "mirror/object_array-inl.h" 59#include "mirror/proxy.h" 60#include "mirror/reference-inl.h" 61#include "mirror/stack_trace_element.h" 62#include "mirror/string-inl.h" 63#include "os.h" 64#include "runtime.h" 65#include "entrypoints/entrypoint_utils.h" 66#include "ScopedLocalRef.h" 67#include "scoped_thread_state_change.h" 68#include "handle_scope-inl.h" 69#include "thread.h" 70#include "utils.h" 71#include "verifier/method_verifier.h" 72#include "well_known_classes.h" 73 74namespace art { 75 76static void ThrowNoClassDefFoundError(const char* fmt, ...) 77 __attribute__((__format__(__printf__, 1, 2))) 78 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 79static void ThrowNoClassDefFoundError(const char* fmt, ...) { 80 va_list args; 81 va_start(args, fmt); 82 Thread* self = Thread::Current(); 83 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 84 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 85 va_end(args); 86} 87 88static void ThrowEarlierClassFailure(mirror::Class* c) 89 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 90 // The class failed to initialize on a previous attempt, so we want to throw 91 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 92 // failed in verification, in which case v2 5.4.1 says we need to re-throw 93 // the previous error. 94 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 95 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 96 } 97 98 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 99 Thread* self = Thread::Current(); 100 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 101 if (c->GetVerifyErrorClass() != NULL) { 102 // TODO: change the verifier to store an _instance_, with a useful detail message? 103 std::string temp; 104 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 105 PrettyDescriptor(c).c_str()); 106 } else { 107 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 108 PrettyDescriptor(c).c_str()); 109 } 110} 111 112static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 113 Thread* self = Thread::Current(); 114 JNIEnv* env = self->GetJniEnv(); 115 116 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 117 CHECK(cause.get() != NULL); 118 119 env->ExceptionClear(); 120 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 121 env->Throw(cause.get()); 122 123 // We only wrap non-Error exceptions; an Error can just be used as-is. 124 if (!is_error) { 125 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 126 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 127 } 128} 129 130static size_t Hash(const char* s) { 131 // This is the java.lang.String hashcode for convenience, not interoperability. 132 size_t hash = 0; 133 for (; *s != '\0'; ++s) { 134 hash = hash * 31 + *s; 135 } 136 return hash; 137} 138 139const char* ClassLinker::class_roots_descriptors_[] = { 140 "Ljava/lang/Class;", 141 "Ljava/lang/Object;", 142 "[Ljava/lang/Class;", 143 "[Ljava/lang/Object;", 144 "Ljava/lang/String;", 145 "Ljava/lang/DexCache;", 146 "Ljava/lang/ref/Reference;", 147 "Ljava/lang/reflect/ArtField;", 148 "Ljava/lang/reflect/ArtMethod;", 149 "Ljava/lang/reflect/Proxy;", 150 "[Ljava/lang/String;", 151 "[Ljava/lang/reflect/ArtField;", 152 "[Ljava/lang/reflect/ArtMethod;", 153 "Ljava/lang/ClassLoader;", 154 "Ljava/lang/Throwable;", 155 "Ljava/lang/ClassNotFoundException;", 156 "Ljava/lang/StackTraceElement;", 157 "Z", 158 "B", 159 "C", 160 "D", 161 "F", 162 "I", 163 "J", 164 "S", 165 "V", 166 "[Z", 167 "[B", 168 "[C", 169 "[D", 170 "[F", 171 "[I", 172 "[J", 173 "[S", 174 "[Ljava/lang/StackTraceElement;", 175}; 176 177ClassLinker::ClassLinker(InternTable* intern_table) 178 // dex_lock_ is recursive as it may be used in stack dumping. 179 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 180 dex_cache_image_class_lookup_required_(false), 181 failed_dex_cache_class_lookups_(0), 182 class_roots_(nullptr), 183 array_iftable_(nullptr), 184 find_array_class_cache_next_victim_(0), 185 init_done_(false), 186 log_new_dex_caches_roots_(false), 187 log_new_class_table_roots_(false), 188 intern_table_(intern_table), 189 portable_resolution_trampoline_(nullptr), 190 quick_resolution_trampoline_(nullptr), 191 portable_imt_conflict_trampoline_(nullptr), 192 quick_imt_conflict_trampoline_(nullptr), 193 quick_generic_jni_trampoline_(nullptr), 194 quick_to_interpreter_bridge_trampoline_(nullptr) { 195 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 196 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 197} 198 199// To set a value for generic JNI. May be necessary in compiler tests. 200extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 201extern "C" void art_quick_resolution_trampoline(mirror::ArtMethod*); 202extern "C" void art_quick_imt_conflict_trampoline(mirror::ArtMethod*); 203extern "C" void art_quick_to_interpreter_bridge(mirror::ArtMethod*); 204 205void ClassLinker::InitWithoutImage(const std::vector<const DexFile*>& boot_class_path) { 206 VLOG(startup) << "ClassLinker::Init"; 207 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 208 209 CHECK(!init_done_); 210 211 // java_lang_Class comes first, it's needed for AllocClass 212 Thread* self = Thread::Current(); 213 gc::Heap* heap = Runtime::Current()->GetHeap(); 214 // The GC can't handle an object with a null class since we can't get the size of this object. 215 heap->IncrementDisableMovingGC(self); 216 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 217 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 218 heap->AllocNonMovableObject<true>(self, nullptr, 219 mirror::Class::ClassClassSize(), 220 VoidFunctor())))); 221 CHECK(java_lang_Class.Get() != NULL); 222 mirror::Class::SetClassClass(java_lang_Class.Get()); 223 java_lang_Class->SetClass(java_lang_Class.Get()); 224 if (kUseBakerOrBrooksReadBarrier) { 225 java_lang_Class->AssertReadBarrierPointer(); 226 } 227 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 228 heap->DecrementDisableMovingGC(self); 229 // AllocClass(mirror::Class*) can now be used 230 231 // Class[] is used for reflection support. 232 Handle<mirror::Class> class_array_class(hs.NewHandle( 233 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 234 class_array_class->SetComponentType(java_lang_Class.Get()); 235 236 // java_lang_Object comes next so that object_array_class can be created. 237 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 238 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 239 CHECK(java_lang_Object.Get() != NULL); 240 // backfill Object as the super class of Class. 241 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 242 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 243 244 // Object[] next to hold class roots. 245 Handle<mirror::Class> object_array_class(hs.NewHandle( 246 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 247 object_array_class->SetComponentType(java_lang_Object.Get()); 248 249 // Setup the char (primitive) class to be used for char[]. 250 Handle<mirror::Class> char_class(hs.NewHandle( 251 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 252 253 // Setup the char[] class to be used for String. 254 Handle<mirror::Class> char_array_class(hs.NewHandle( 255 AllocClass(self, java_lang_Class.Get(), 256 mirror::Array::ClassSize()))); 257 char_array_class->SetComponentType(char_class.Get()); 258 mirror::CharArray::SetArrayClass(char_array_class.Get()); 259 260 // Setup String. 261 Handle<mirror::Class> java_lang_String(hs.NewHandle( 262 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 263 mirror::String::SetClass(java_lang_String.Get()); 264 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 265 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 266 267 // Setup Reference. 268 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 269 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 270 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 271 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 272 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 273 274 // Create storage for root classes, save away our work so far (requires descriptors). 275 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 276 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 277 kClassRootsMax)); 278 CHECK(!class_roots_.IsNull()); 279 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 280 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 281 SetClassRoot(kClassArrayClass, class_array_class.Get()); 282 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 283 SetClassRoot(kCharArrayClass, char_array_class.Get()); 284 SetClassRoot(kJavaLangString, java_lang_String.Get()); 285 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 286 287 // Setup the primitive type classes. 288 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 289 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 290 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 291 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 292 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 293 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 294 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 295 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 296 297 // Create array interface entries to populate once we can load system classes. 298 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 299 300 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 301 Handle<mirror::Class> int_array_class(hs.NewHandle( 302 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 303 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 304 mirror::IntArray::SetArrayClass(int_array_class.Get()); 305 SetClassRoot(kIntArrayClass, int_array_class.Get()); 306 307 // now that these are registered, we can use AllocClass() and AllocObjectArray 308 309 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 310 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 311 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 312 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 313 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 314 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 315 316 // Constructor, Field, Method, and AbstractMethod are necessary so 317 // that FindClass can link members. 318 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 319 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 320 CHECK(java_lang_reflect_ArtField.Get() != NULL); 321 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 322 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 323 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 324 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 325 326 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 327 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 328 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 329 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 330 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 331 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 332 333 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 334 335 // Set up array classes for string, field, method 336 Handle<mirror::Class> object_array_string(hs.NewHandle( 337 AllocClass(self, java_lang_Class.Get(), 338 mirror::ObjectArray<mirror::String>::ClassSize()))); 339 object_array_string->SetComponentType(java_lang_String.Get()); 340 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 341 342 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 343 AllocClass(self, java_lang_Class.Get(), 344 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 345 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 346 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 347 348 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 349 AllocClass(self, java_lang_Class.Get(), 350 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 351 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 352 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 353 354 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 355 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 356 // these roots. 357 CHECK_NE(0U, boot_class_path.size()); 358 for (size_t i = 0; i != boot_class_path.size(); ++i) { 359 const DexFile* dex_file = boot_class_path[i]; 360 CHECK(dex_file != NULL); 361 AppendToBootClassPath(*dex_file); 362 } 363 364 // now we can use FindSystemClass 365 366 // run char class through InitializePrimitiveClass to finish init 367 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 368 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 369 370 // Create runtime resolution and imt conflict methods. Also setup the default imt. 371 Runtime* runtime = Runtime::Current(); 372 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 373 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 374 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 375 376 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 377 // we do not need friend classes or a publicly exposed setter. 378 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 379 if (!runtime->IsCompiler()) { 380 // We need to set up the generic trampolines since we don't have an image. 381 quick_resolution_trampoline_ = reinterpret_cast<void*>(art_quick_resolution_trampoline); 382 quick_imt_conflict_trampoline_ = reinterpret_cast<void*>(art_quick_imt_conflict_trampoline); 383 quick_to_interpreter_bridge_trampoline_ = reinterpret_cast<void*>(art_quick_to_interpreter_bridge); 384 } 385 386 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 387 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 388 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 389 CHECK_EQ(java_lang_Object.Get(), Object_class); 390 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 391 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 392 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 393 std::ostringstream os1, os2; 394 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 395 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 396 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 397 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 398 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 399 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 400 CHECK_EQ(java_lang_String.Get(), String_class); 401 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 402 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 403 404 // Setup the primitive array type classes - can't be done until Object has a vtable. 405 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 406 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 407 408 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 409 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 410 411 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 412 CHECK_EQ(char_array_class.Get(), found_char_array_class); 413 414 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 415 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 416 417 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 418 CHECK_EQ(int_array_class.Get(), found_int_array_class); 419 420 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 421 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 422 423 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 424 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 425 426 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 427 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 428 429 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 430 CHECK_EQ(class_array_class.Get(), found_class_array_class); 431 432 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 433 CHECK_EQ(object_array_class.Get(), found_object_array_class); 434 435 // Setup the single, global copy of "iftable". 436 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 437 CHECK(java_lang_Cloneable != NULL); 438 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 439 CHECK(java_io_Serializable != NULL); 440 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 441 // crawl up and explicitly list all of the supers as well. 442 { 443 mirror::IfTable* array_iftable = array_iftable_.Read(); 444 array_iftable->SetInterface(0, java_lang_Cloneable); 445 array_iftable->SetInterface(1, java_io_Serializable); 446 } 447 448 // Sanity check Class[] and Object[]'s interfaces. 449 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 450 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 451 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 452 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 453 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 454 // dex_cache_ fields and register them in class_table_. 455 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 456 CHECK_EQ(java_lang_Class.Get(), Class_class); 457 458 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 459 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 460 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 461 462 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 463 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 464 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 465 466 mirror::Class* String_array_class = 467 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 468 CHECK_EQ(object_array_string.Get(), String_array_class); 469 470 mirror::Class* Art_method_array_class = 471 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 472 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 473 474 mirror::Class* Art_field_array_class = 475 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 476 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 477 478 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 479 480 // Create java.lang.reflect.Proxy root. 481 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 482 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 483 484 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 485 // finish initializing Reference class 486 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 487 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 488 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 489 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 490 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 491 mirror::Class* java_lang_ref_FinalizerReference = 492 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 493 java_lang_ref_FinalizerReference->SetAccessFlags( 494 java_lang_ref_FinalizerReference->GetAccessFlags() | 495 kAccClassIsReference | kAccClassIsFinalizerReference); 496 mirror::Class* java_lang_ref_PhantomReference = 497 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 498 java_lang_ref_PhantomReference->SetAccessFlags( 499 java_lang_ref_PhantomReference->GetAccessFlags() | 500 kAccClassIsReference | kAccClassIsPhantomReference); 501 mirror::Class* java_lang_ref_SoftReference = 502 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 503 java_lang_ref_SoftReference->SetAccessFlags( 504 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 505 mirror::Class* java_lang_ref_WeakReference = 506 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 507 java_lang_ref_WeakReference->SetAccessFlags( 508 java_lang_ref_WeakReference->GetAccessFlags() | 509 kAccClassIsReference | kAccClassIsWeakReference); 510 511 // Setup the ClassLoader, verifying the object_size_. 512 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 513 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 514 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 515 516 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 517 // java.lang.StackTraceElement as a convenience. 518 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 519 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 520 SetClassRoot(kJavaLangClassNotFoundException, 521 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 522 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 523 SetClassRoot(kJavaLangStackTraceElementArrayClass, 524 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 525 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 526 527 FinishInit(self); 528 529 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 530} 531 532void ClassLinker::FinishInit(Thread* self) { 533 VLOG(startup) << "ClassLinker::FinishInit entering"; 534 535 // Let the heap know some key offsets into java.lang.ref instances 536 // Note: we hard code the field indexes here rather than using FindInstanceField 537 // as the types of the field can't be resolved prior to the runtime being 538 // fully initialized 539 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 540 mirror::Class* java_lang_ref_FinalizerReference = 541 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 542 543 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 544 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 545 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 546 547 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 548 CHECK_STREQ(queue->GetName(), "queue"); 549 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 550 551 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 552 CHECK_STREQ(queueNext->GetName(), "queueNext"); 553 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 554 555 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 556 CHECK_STREQ(referent->GetName(), "referent"); 557 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 558 559 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 560 CHECK_STREQ(zombie->GetName(), "zombie"); 561 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 562 563 // ensure all class_roots_ are initialized 564 for (size_t i = 0; i < kClassRootsMax; i++) { 565 ClassRoot class_root = static_cast<ClassRoot>(i); 566 mirror::Class* klass = GetClassRoot(class_root); 567 CHECK(klass != NULL); 568 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 569 // note SetClassRoot does additional validation. 570 // if possible add new checks there to catch errors early 571 } 572 573 CHECK(!array_iftable_.IsNull()); 574 575 // disable the slow paths in FindClass and CreatePrimitiveClass now 576 // that Object, Class, and Object[] are setup 577 init_done_ = true; 578 579 VLOG(startup) << "ClassLinker::FinishInit exiting"; 580} 581 582void ClassLinker::RunRootClinits() { 583 Thread* self = Thread::Current(); 584 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 585 mirror::Class* c = GetClassRoot(ClassRoot(i)); 586 if (!c->IsArrayClass() && !c->IsPrimitive()) { 587 StackHandleScope<1> hs(self); 588 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 589 EnsureInitialized(h_class, true, true); 590 self->AssertNoPendingException(); 591 } 592 } 593} 594 595bool ClassLinker::GenerateOatFile(const char* dex_filename, 596 int oat_fd, 597 const char* oat_cache_filename, 598 std::string* error_msg) { 599 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 600 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 601 602 gc::Heap* heap = Runtime::Current()->GetHeap(); 603 std::string boot_image_option("--boot-image="); 604 if (heap->GetImageSpace() == nullptr) { 605 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 606 // out of space anyway it might not matter. 607 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 608 "without an image.", dex_filename); 609 return false; 610 } 611 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 612 613 std::string dex_file_option("--dex-file="); 614 dex_file_option += dex_filename; 615 616 std::string oat_fd_option("--oat-fd="); 617 StringAppendF(&oat_fd_option, "%d", oat_fd); 618 619 std::string oat_location_option("--oat-location="); 620 oat_location_option += oat_cache_filename; 621 622 std::vector<std::string> argv; 623 argv.push_back(dex2oat); 624 argv.push_back("--runtime-arg"); 625 argv.push_back("-classpath"); 626 argv.push_back("--runtime-arg"); 627 argv.push_back(Runtime::Current()->GetClassPathString()); 628 629 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 630 631 if (!Runtime::Current()->IsVerificationEnabled()) { 632 argv.push_back("--compiler-filter=verify-none"); 633 } 634 635 if (Runtime::Current()->MustRelocateIfPossible()) { 636 argv.push_back("--runtime-arg"); 637 argv.push_back("-Xrelocate"); 638 } else { 639 argv.push_back("--runtime-arg"); 640 argv.push_back("-Xnorelocate"); 641 } 642 643 if (!kIsTargetBuild) { 644 argv.push_back("--host"); 645 } 646 647 argv.push_back(boot_image_option); 648 argv.push_back(dex_file_option); 649 argv.push_back(oat_fd_option); 650 argv.push_back(oat_location_option); 651 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 652 for (size_t i = 0; i < compiler_options.size(); ++i) { 653 argv.push_back(compiler_options[i].c_str()); 654 } 655 656 return Exec(argv, error_msg); 657} 658 659const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 660 WriterMutexLock mu(Thread::Current(), dex_lock_); 661 if (kIsDebugBuild) { 662 for (size_t i = 0; i < oat_files_.size(); ++i) { 663 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 664 } 665 } 666 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 667 oat_files_.push_back(oat_file); 668 return oat_file; 669} 670 671OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 672 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 673 OatFile* oat_file = space->ReleaseOatFile(); 674 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 675 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 676 return *oat_file; 677} 678 679const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 680 const char* dex_location = dex_file.GetLocation().c_str(); 681 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 682 return FindOpenedOatFile(nullptr, dex_location, &dex_location_checksum); 683} 684 685const OatFile* ClassLinker::FindOpenedOatFile(const char* oat_location, const char* dex_location, 686 const uint32_t* const dex_location_checksum) { 687 ReaderMutexLock mu(Thread::Current(), dex_lock_); 688 for (size_t i = 0; i < oat_files_.size(); i++) { 689 const OatFile* oat_file = oat_files_[i]; 690 DCHECK(oat_file != NULL); 691 692 if (oat_location != nullptr) { 693 if (oat_file->GetLocation() != oat_location) { 694 continue; 695 } 696 } 697 698 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 699 dex_location_checksum, 700 false); 701 if (oat_dex_file != NULL) { 702 return oat_file; 703 } 704 } 705 return NULL; 706} 707 708static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, const char* dex_location, 709 bool generated, 710 std::vector<std::string>* error_msgs, 711 std::vector<const DexFile*>* dex_files) { 712 if (oat_file == nullptr) { 713 return false; 714 } 715 716 size_t old_size = dex_files->size(); // To rollback on error. 717 718 bool success = true; 719 for (size_t i = 0; success; ++i) { 720 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 721 const char* next_name = next_name_str.c_str(); 722 723 uint32_t dex_location_checksum; 724 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 725 std::string error_msg; 726 if (!DexFile::GetChecksum(next_name, dex_location_checksum_pointer, &error_msg)) { 727 DCHECK_EQ(false, i == 0 && generated); 728 dex_location_checksum_pointer = nullptr; 729 } 730 731 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 732 733 if (oat_dex_file == nullptr) { 734 if (i == 0 && generated) { 735 std::string error_msg; 736 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 737 " file'%s'", dex_location, dex_location_checksum, 738 oat_file->GetLocation().c_str()); 739 error_msgs->push_back(error_msg); 740 } 741 break; // Not found, done. 742 } 743 744 // Checksum test. Test must succeed when generated. 745 success = !generated; 746 if (dex_location_checksum_pointer != nullptr) { 747 success = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 748 } 749 750 if (success) { 751 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 752 if (dex_file == nullptr) { 753 success = false; 754 error_msgs->push_back(error_msg); 755 } else { 756 dex_files->push_back(dex_file); 757 } 758 } 759 760 // When we generated the file, we expect success, or something is terribly wrong. 761 CHECK_EQ(false, generated && !success) 762 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 763 << std::hex << " dex_location_checksum=" << dex_location_checksum 764 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 765 } 766 767 if (dex_files->size() == old_size) { 768 success = false; // We did not even find classes.dex 769 } 770 771 if (success) { 772 return true; 773 } else { 774 // Free all the dex files we have loaded. 775 auto it = dex_files->begin() + old_size; 776 auto it_end = dex_files->end(); 777 for (; it != it_end; it++) { 778 delete *it; 779 } 780 dex_files->erase(dex_files->begin() + old_size, it_end); 781 782 return false; 783 } 784} 785 786// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 787// complicates the loading process, as we should not use an iterative loading process, because that 788// would register the oat file and dex files that come before the broken one. Instead, check all 789// multidex ahead of time. 790bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 791 std::vector<std::string>* error_msgs, 792 std::vector<const DexFile*>* dex_files) { 793 // 1) Check whether we have an open oat file. 794 // This requires a dex checksum, use the "primary" one. 795 uint32_t dex_location_checksum; 796 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 797 bool have_checksum = true; 798 std::string checksum_error_msg; 799 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 800 dex_location_checksum_pointer = nullptr; 801 have_checksum = false; 802 } 803 804 bool needs_registering = false; 805 806 std::unique_ptr<const OatFile> open_oat_file(FindOpenedOatFile(oat_location, dex_location, 807 dex_location_checksum_pointer)); 808 809 // 2) If we do not have an open one, maybe there's one on disk already. 810 811 // In case the oat file is not open, we play a locking game here so 812 // that if two different processes race to load and register or generate 813 // (or worse, one tries to open a partial generated file) we will be okay. 814 // This is actually common with apps that use DexClassLoader to work 815 // around the dex method reference limit and that have a background 816 // service running in a separate process. 817 ScopedFlock scoped_flock; 818 819 if (open_oat_file.get() == nullptr) { 820 if (oat_location != nullptr) { 821 // Can only do this if we have a checksum, else error. 822 if (!have_checksum) { 823 error_msgs->push_back(checksum_error_msg); 824 return false; 825 } 826 827 std::string error_msg; 828 829 // We are loading or creating one in the future. Time to set up the file lock. 830 if (!scoped_flock.Init(oat_location, &error_msg)) { 831 error_msgs->push_back(error_msg); 832 return false; 833 } 834 835 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 836 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 837 oat_location, &error_msg)); 838 839 if (open_oat_file.get() == nullptr) { 840 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 841 dex_location, oat_location, error_msg.c_str()); 842 VLOG(class_linker) << compound_msg; 843 error_msgs->push_back(compound_msg); 844 } 845 } else { 846 // TODO: What to lock here? 847 bool obsolete_file_cleanup_failed; 848 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 849 dex_location_checksum_pointer, 850 kRuntimeISA, error_msgs, 851 &obsolete_file_cleanup_failed)); 852 // There's no point in going forward and eventually try to regenerate the 853 // file if we couldn't remove the obsolete one. Mostly likely we will fail 854 // with the same error when trying to write the new file. 855 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 856 if (obsolete_file_cleanup_failed) { 857 return false; 858 } 859 } 860 needs_registering = true; 861 } 862 863 // 3) If we have an oat file, check all contained multidex files for our dex_location. 864 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 865 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, false, error_msgs, 866 dex_files); 867 if (success) { 868 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 869 if (needs_registering) { 870 // We opened the oat file, so we must register it. 871 RegisterOatFile(oat_file); 872 } 873 // If the file isn't executable we failed patchoat but did manage to get the dex files. 874 return oat_file->IsExecutable(); 875 } else { 876 if (needs_registering) { 877 // We opened it, delete it. 878 open_oat_file.reset(); 879 } else { 880 open_oat_file.release(); // Do not delete open oat files. 881 } 882 } 883 884 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 885 886 // Need a checksum, fail else. 887 if (!have_checksum) { 888 error_msgs->push_back(checksum_error_msg); 889 return false; 890 } 891 892 // Look in cache location if no oat_location is given. 893 std::string cache_location; 894 if (oat_location == nullptr) { 895 // Use the dalvik cache. 896 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 897 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 898 oat_location = cache_location.c_str(); 899 } 900 901 bool has_flock = true; 902 // Definitely need to lock now. 903 if (!scoped_flock.HasFile()) { 904 std::string error_msg; 905 if (!scoped_flock.Init(oat_location, &error_msg)) { 906 error_msgs->push_back(error_msg); 907 has_flock = false; 908 } 909 } 910 911 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 912 // Create the oat file. 913 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 914 oat_location, error_msgs)); 915 } 916 917 // Failed, bail. 918 if (open_oat_file.get() == nullptr) { 919 std::string error_msg; 920 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 921 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 922 error_msgs->push_back(error_msg); 923 return false; 924 } 925 926 // Try to load again, but stronger checks. 927 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, true, error_msgs, 928 dex_files); 929 if (success) { 930 RegisterOatFile(open_oat_file.release()); 931 return true; 932 } else { 933 return false; 934 } 935} 936 937const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 938 uint32_t dex_location_checksum, 939 const char* oat_location, 940 std::string* error_msg) { 941 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 942 !Runtime::Current()->IsCompiler(), 943 error_msg)); 944 if (oat_file.get() == nullptr) { 945 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 946 error_msg->c_str()); 947 return nullptr; 948 } 949 Runtime* runtime = Runtime::Current(); 950 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 951 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 952 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 953 if (expected_image_oat_checksum != actual_image_oat_checksum) { 954 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 955 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 956 actual_image_oat_checksum); 957 return nullptr; 958 } 959 960 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 961 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 962 if (expected_image_oat_offset != actual_image_oat_offset) { 963 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 964 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 965 actual_image_oat_offset); 966 return nullptr; 967 } 968 int32_t expected_patch_delta = image_header.GetPatchDelta(); 969 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 970 if (expected_patch_delta != actual_patch_delta) { 971 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 972 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 973 return nullptr; 974 } 975 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 976 &dex_location_checksum); 977 if (oat_dex_file == nullptr) { 978 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 979 dex_location); 980 return nullptr; 981 } 982 uint32_t expected_dex_checksum = dex_location_checksum; 983 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 984 if (expected_dex_checksum != actual_dex_checksum) { 985 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 986 "found 0x%x", oat_location, expected_dex_checksum, 987 actual_dex_checksum); 988 return nullptr; 989 } 990 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 991 if (dex_file.get() != nullptr) { 992 return oat_file.release(); 993 } else { 994 return nullptr; 995 } 996} 997 998const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 999 int fd, const char* oat_location, 1000 std::vector<std::string>* error_msgs) { 1001 // Generate the output oat file for the dex file 1002 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1003 std::string error_msg; 1004 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1005 CHECK(!error_msg.empty()); 1006 error_msgs->push_back(error_msg); 1007 return nullptr; 1008 } 1009 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 1010 !Runtime::Current()->IsCompiler(), 1011 &error_msg)); 1012 if (oat_file.get() == nullptr) { 1013 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1014 oat_location, error_msg.c_str()); 1015 error_msgs->push_back(compound_msg); 1016 return nullptr; 1017 } 1018 1019 return oat_file.release(); 1020} 1021 1022bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1023 const InstructionSet instruction_set) { 1024 Runtime* runtime = Runtime::Current(); 1025 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1026 if (image_space == nullptr) { 1027 return false; 1028 } 1029 uint32_t image_oat_checksum = 0; 1030 if (instruction_set == kRuntimeISA) { 1031 const ImageHeader& image_header = image_space->GetImageHeader(); 1032 image_oat_checksum = image_header.GetOatChecksum(); 1033 } else { 1034 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1035 image_space->GetImageLocation().c_str(), instruction_set)); 1036 image_oat_checksum = image_header->GetOatChecksum(); 1037 } 1038 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1039} 1040 1041bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1042 const InstructionSet instruction_set, 1043 std::string* error_msg) { 1044 Runtime* runtime = Runtime::Current(); 1045 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1046 if (image_space == nullptr) { 1047 *error_msg = "No image space for verification against"; 1048 return false; 1049 } 1050 1051 // If the requested instruction set is the same as the current runtime, 1052 // we can use the checksums directly. If it isn't, we'll have to read the 1053 // image header from the image for the right instruction set. 1054 uint32_t image_oat_checksum = 0; 1055 uintptr_t image_oat_data_begin = 0; 1056 int32_t image_patch_delta = 0; 1057 if (instruction_set == Runtime::Current()->GetInstructionSet()) { 1058 const ImageHeader& image_header = image_space->GetImageHeader(); 1059 image_oat_checksum = image_header.GetOatChecksum(); 1060 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1061 image_patch_delta = image_header.GetPatchDelta(); 1062 } else { 1063 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1064 image_space->GetImageLocation().c_str(), instruction_set)); 1065 image_oat_checksum = image_header->GetOatChecksum(); 1066 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1067 image_patch_delta = image_header->GetPatchDelta(); 1068 } 1069 const OatHeader& oat_header = oat_file->GetOatHeader(); 1070 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1071 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1072 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1073 if (!ret) { 1074 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1075 oat_file->GetLocation().c_str(), 1076 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1077 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1078 oat_file->GetOatHeader().GetImagePatchDelta(), 1079 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1080 } 1081 return ret; 1082} 1083 1084bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1085 const char* dex_location, 1086 uint32_t dex_location_checksum, 1087 const InstructionSet instruction_set, 1088 std::string* error_msg) { 1089 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1090 return false; 1091 } 1092 1093 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1094 &dex_location_checksum); 1095 if (oat_dex_file == NULL) { 1096 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1097 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1098 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 1099 for (size_t i = 0; i < oat_dex_files.size(); i++) { 1100 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 1101 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 1102 oat_file->GetLocation().c_str(), 1103 oat_dex_file->GetDexFileLocation().c_str()); 1104 } 1105 return false; 1106 } 1107 1108 if (dex_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) { 1109 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1110 oat_file->GetLocation().c_str(), 1111 oat_dex_file->GetDexFileLocationChecksum(), 1112 dex_location, dex_location_checksum); 1113 return false; 1114 } 1115 return true; 1116} 1117 1118bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1119 const char* dex_location, 1120 std::string* error_msg) { 1121 CHECK(oat_file != nullptr); 1122 CHECK(dex_location != nullptr); 1123 std::unique_ptr<const DexFile> dex_file; 1124 uint32_t dex_location_checksum; 1125 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 1126 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1127 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1128 // directory. 1129 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1130 if (oat_dex_file == nullptr) { 1131 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1132 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1133 error_msg->c_str()); 1134 return false; 1135 } 1136 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1137 } else { 1138 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, dex_location_checksum, 1139 kRuntimeISA, error_msg); 1140 if (!verified) { 1141 return false; 1142 } 1143 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1144 &dex_location_checksum)->OpenDexFile(error_msg)); 1145 } 1146 return dex_file.get() != nullptr; 1147} 1148 1149const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1150 const char* dex_location, 1151 const uint32_t* const dex_location_checksum, 1152 InstructionSet isa, 1153 std::vector<std::string>* error_msgs, 1154 bool* obsolete_file_cleanup_failed) { 1155 *obsolete_file_cleanup_failed = false; 1156 bool already_opened = false; 1157 std::string dex_location_str(dex_location); 1158 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1159 &already_opened, 1160 obsolete_file_cleanup_failed, 1161 error_msgs)); 1162 std::string error_msg; 1163 if (oat_file.get() == nullptr) { 1164 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1165 dex_location)); 1166 return nullptr; 1167 } else if (oat_file->IsExecutable() && 1168 !VerifyOatWithDexFile(oat_file.get(), dex_location, &error_msg)) { 1169 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1170 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1171 error_msg.c_str())); 1172 return nullptr; 1173 } else if (!oat_file->IsExecutable() && 1174 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1175 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1176 "dex location '%s'. Image checksum incorrect.", 1177 oat_file->GetLocation().c_str(), dex_location)); 1178 return nullptr; 1179 } else { 1180 return oat_file.release(); 1181 } 1182} 1183 1184const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1185 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1186 for (size_t i = 0; i < oat_files_.size(); i++) { 1187 const OatFile* oat_file = oat_files_[i]; 1188 DCHECK(oat_file != nullptr); 1189 if (oat_file->GetLocation() == oat_location) { 1190 return oat_file; 1191 } 1192 } 1193 return nullptr; 1194} 1195 1196const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1197 InstructionSet isa, 1198 bool *already_opened, 1199 bool *obsolete_file_cleanup_failed, 1200 std::vector<std::string>* error_msgs) { 1201 // Find out if we've already opened the file 1202 const OatFile* ret = nullptr; 1203 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1204 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1205 if (ret != nullptr) { 1206 *already_opened = true; 1207 return ret; 1208 } 1209 1210 std::string dalvik_cache; 1211 bool have_android_data = false; 1212 bool have_dalvik_cache = false; 1213 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1214 &have_android_data, &have_dalvik_cache); 1215 std::string cache_filename; 1216 if (have_dalvik_cache) { 1217 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1218 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1219 if (ret != nullptr) { 1220 *already_opened = true; 1221 return ret; 1222 } 1223 } else { 1224 // If we need to relocate we should just place odex back where it started. 1225 cache_filename = odex_filename; 1226 } 1227 1228 ret = nullptr; 1229 1230 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1231 // 1232 // Now we do the following: 1233 // 1) Try and open the odex version 1234 // 2) If present, checksum-verified & relocated correctly return it 1235 // 3) Close the odex version to free up its address space. 1236 // 4) Try and open the cache version 1237 // 5) If present, checksum-verified & relocated correctly return it 1238 // 6) Close the cache version to free up its address space. 1239 // 7) If we should relocate: 1240 // a) If we have opened and checksum-verified the odex version relocate it to 1241 // 'cache_filename' and return it 1242 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1243 // it. This should not happen often (I think only the run-test's will hit this case). 1244 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1245 // this point. 1246 // 9) Return nullptr 1247 1248 *already_opened = false; 1249 const Runtime* runtime = Runtime::Current(); 1250 CHECK(runtime != nullptr); 1251 bool executable = !runtime->IsCompiler(); 1252 1253 std::string odex_error_msg; 1254 bool should_patch_system = false; 1255 bool odex_checksum_verified = false; 1256 { 1257 // There is a high probability that these both these oat files map similar/the same address 1258 // spaces so we must scope them like this so they each gets its turn. 1259 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, NULL, 1260 executable, &odex_error_msg)); 1261 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1262 &odex_checksum_verified, 1263 &odex_error_msg)) { 1264 error_msgs->push_back(odex_error_msg); 1265 return odex_oat_file.release(); 1266 } else if (odex_checksum_verified) { 1267 // We can just relocate 1268 should_patch_system = true; 1269 odex_error_msg = "Image Patches are incorrect"; 1270 } 1271 } 1272 1273 1274 std::string cache_error_msg; 1275 bool should_patch_cache = false; 1276 bool cache_checksum_verified = false; 1277 if (have_dalvik_cache) { 1278 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, NULL, 1279 executable, &cache_error_msg)); 1280 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1281 &cache_checksum_verified, 1282 &cache_error_msg)) { 1283 error_msgs->push_back(cache_error_msg); 1284 return cache_oat_file.release(); 1285 } else if (cache_checksum_verified) { 1286 // We can just relocate 1287 should_patch_cache = true; 1288 cache_error_msg = "Image Patches are incorrect"; 1289 } 1290 } else if (have_android_data) { 1291 // dalvik_cache does not exist but android data does. This means we should be able to create 1292 // it, so we should try. 1293 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1294 } 1295 1296 ret = nullptr; 1297 std::string error_msg; 1298 if (runtime->CanRelocate()) { 1299 // Run relocation 1300 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1301 if (space != nullptr) { 1302 const std::string& image_location = space->GetImageLocation(); 1303 if (odex_checksum_verified && should_patch_system) { 1304 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1305 } else if (cache_checksum_verified && should_patch_cache) { 1306 CHECK(have_dalvik_cache); 1307 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1308 } 1309 } 1310 } 1311 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1312 // implicitly: were able to fine where the cached version is but we were unable to use it, 1313 // either as a destination for relocation or to open a file. We should delete it if it is 1314 // there. 1315 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1316 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1317 "searching for dex file %s: %s", 1318 cache_filename.c_str(), dex_location.c_str(), 1319 strerror(errno)); 1320 error_msgs->push_back(rm_error_msg); 1321 VLOG(class_linker) << rm_error_msg; 1322 // Let the caller know that we couldn't remove the obsolete file. 1323 // This is a good indication that further writes may fail as well. 1324 *obsolete_file_cleanup_failed = true; 1325 } 1326 } 1327 if (ret == nullptr) { 1328 VLOG(class_linker) << error_msg; 1329 error_msgs->push_back(error_msg); 1330 std::string relocation_msg; 1331 if (runtime->CanRelocate()) { 1332 relocation_msg = StringPrintf(" and relocation failed"); 1333 } 1334 if (have_dalvik_cache && cache_checksum_verified) { 1335 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1336 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1337 cache_filename.c_str(), cache_error_msg.c_str(), 1338 relocation_msg.c_str()); 1339 } else { 1340 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1341 "dalvik_cache availible)%s.", odex_filename.c_str(), 1342 odex_error_msg.c_str(), relocation_msg.c_str()); 1343 } 1344 VLOG(class_linker) << error_msg; 1345 error_msgs->push_back(error_msg); 1346 } 1347 return ret; 1348} 1349 1350const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1351 InstructionSet isa, 1352 std::string* error_msg) { 1353 // We open it non-executable 1354 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, NULL, false, error_msg)); 1355 if (output.get() == nullptr) { 1356 return nullptr; 1357 } 1358 if (VerifyOatImageChecksum(output.get(), isa)) { 1359 return output.release(); 1360 } else { 1361 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1362 oat_path.c_str()); 1363 return nullptr; 1364 } 1365} 1366 1367const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1368 const std::string& output_oat, 1369 const std::string& image_location, 1370 InstructionSet isa, 1371 std::string* error_msg) { 1372 if (!Runtime::Current()->GetHeap()->HasImageSpace()) { 1373 // We don't have an image space so there is no point in trying to patchoat. 1374 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1375 << "running without an image. Attempting to use oat file for interpretation."; 1376 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1377 } 1378 if (!Runtime::Current()->IsDex2OatEnabled()) { 1379 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1380 // input_oat but make sure we only do interpretation on it's dex files. 1381 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1382 << "disabled. Attempting to use oat file for interpretation"; 1383 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1384 } 1385 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1386 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1387 1388 std::string isa_arg("--instruction-set="); 1389 isa_arg += GetInstructionSetString(isa); 1390 std::string input_oat_filename_arg("--input-oat-file="); 1391 input_oat_filename_arg += input_oat; 1392 std::string output_oat_filename_arg("--output-oat-file="); 1393 output_oat_filename_arg += output_oat; 1394 std::string patched_image_arg("--patched-image-location="); 1395 patched_image_arg += image_location; 1396 1397 std::vector<std::string> argv; 1398 argv.push_back(patchoat); 1399 argv.push_back(isa_arg); 1400 argv.push_back(input_oat_filename_arg); 1401 argv.push_back(output_oat_filename_arg); 1402 argv.push_back(patched_image_arg); 1403 1404 std::string command_line(Join(argv, ' ')); 1405 LOG(INFO) << "Relocate Oat File: " << command_line; 1406 bool success = Exec(argv, error_msg); 1407 if (success) { 1408 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, NULL, 1409 !Runtime::Current()->IsCompiler(), error_msg)); 1410 bool checksum_verified = false; 1411 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1412 return output.release(); 1413 } else if (output.get() != nullptr) { 1414 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1415 "but output file '%s' failed verifcation: %s", 1416 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1417 } else { 1418 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1419 "but was unable to open output file '%s': %s", 1420 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1421 } 1422 } else if (!Runtime::Current()->IsCompiler()) { 1423 // patchoat failed which means we probably don't have enough room to place the output oat file, 1424 // instead of failing we should just run the interpreter from the dex files in the input oat. 1425 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1426 << "for interpretation. patchoat failure was: " << *error_msg; 1427 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1428 } else { 1429 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1430 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1431 error_msg->c_str()); 1432 } 1433 return nullptr; 1434} 1435 1436int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1437 Runtime* runtime = Runtime::Current(); 1438 int32_t real_patch_delta; 1439 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1440 CHECK(image_space != nullptr); 1441 if (isa == Runtime::Current()->GetInstructionSet()) { 1442 const ImageHeader& image_header = image_space->GetImageHeader(); 1443 real_patch_delta = image_header.GetPatchDelta(); 1444 } else { 1445 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1446 image_space->GetImageLocation().c_str(), isa)); 1447 real_patch_delta = image_header->GetPatchDelta(); 1448 } 1449 const OatHeader& oat_header = oat_file->GetOatHeader(); 1450 return real_patch_delta - oat_header.GetImagePatchDelta(); 1451} 1452 1453bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1454 bool* checksum_verified, 1455 std::string* error_msg) { 1456 std::string compound_msg("Oat file failed to verify: "); 1457 Runtime* runtime = Runtime::Current(); 1458 uint32_t real_image_checksum; 1459 void* real_image_oat_offset; 1460 int32_t real_patch_delta; 1461 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1462 if (image_space == nullptr) { 1463 *error_msg = "No image space present"; 1464 return false; 1465 } 1466 if (isa == Runtime::Current()->GetInstructionSet()) { 1467 const ImageHeader& image_header = image_space->GetImageHeader(); 1468 real_image_checksum = image_header.GetOatChecksum(); 1469 real_image_oat_offset = image_header.GetOatDataBegin(); 1470 real_patch_delta = image_header.GetPatchDelta(); 1471 } else { 1472 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1473 image_space->GetImageLocation().c_str(), isa)); 1474 real_image_checksum = image_header->GetOatChecksum(); 1475 real_image_oat_offset = image_header->GetOatDataBegin(); 1476 real_patch_delta = image_header->GetPatchDelta(); 1477 } 1478 1479 const OatHeader& oat_header = oat_file->GetOatHeader(); 1480 1481 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1482 *checksum_verified = oat_image_checksum == real_image_checksum; 1483 if (!*checksum_verified) { 1484 compound_msg += StringPrintf(" Oat Image Checksum Incorrect (expected 0x%x, recieved 0x%x)", 1485 real_image_checksum, oat_image_checksum); 1486 } 1487 1488 void* oat_image_oat_offset = 1489 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1490 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1491 if (!offset_verified) { 1492 compound_msg += StringPrintf(" Oat Image oat offset incorrect (expected 0x%p, recieved 0x%p)", 1493 real_image_oat_offset, oat_image_oat_offset); 1494 } 1495 1496 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1497 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1498 if (!patch_delta_verified) { 1499 compound_msg += StringPrintf(" Oat image patch delta incorrect (expected 0x%x, recieved 0x%x)", 1500 real_patch_delta, oat_patch_delta); 1501 } 1502 1503 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1504 if (ret) { 1505 *error_msg = compound_msg; 1506 } 1507 return ret; 1508} 1509 1510const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1511 std::string* error_msg) { 1512 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1513 if (oat_file != nullptr) { 1514 return oat_file; 1515 } 1516 1517 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1518 error_msg); 1519 if (oat_file == NULL) { 1520 return NULL; 1521 } 1522 return oat_file; 1523} 1524 1525static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1526 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1527 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1528 1529 DCHECK(obj != NULL); 1530 DCHECK(class_linker != NULL); 1531 1532 if (obj->IsArtMethod()) { 1533 mirror::ArtMethod* method = obj->AsArtMethod(); 1534 if (!method->IsNative()) { 1535 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1536 if (method != Runtime::Current()->GetResolutionMethod()) { 1537 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1538 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1539 } 1540 } 1541 } 1542} 1543 1544void ClassLinker::InitFromImage() { 1545 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1546 CHECK(!init_done_); 1547 1548 Thread* self = Thread::Current(); 1549 gc::Heap* heap = Runtime::Current()->GetHeap(); 1550 gc::space::ImageSpace* space = heap->GetImageSpace(); 1551 dex_cache_image_class_lookup_required_ = true; 1552 CHECK(space != NULL); 1553 OatFile& oat_file = GetImageOatFile(space); 1554 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1555 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1556 const char* image_file_location = oat_file.GetOatHeader(). 1557 GetStoreValueByKey(OatHeader::kImageLocationKey); 1558 CHECK(image_file_location == nullptr || *image_file_location == 0); 1559 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1560 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1561 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1562 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1563 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1564 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1565 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1566 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1567 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1568 1569 StackHandleScope<1> hs(self); 1570 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1571 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1572 AsObjectArray<mirror::Class>())); 1573 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1574 1575 // Special case of setting up the String class early so that we can test arbitrary objects 1576 // as being Strings or not 1577 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1578 1579 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1580 static_cast<uint32_t>(dex_caches->GetLength())); 1581 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1582 StackHandleScope<1> hs(self); 1583 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1584 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1585 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1586 nullptr); 1587 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1588 std::string error_msg; 1589 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1590 if (dex_file == NULL) { 1591 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1592 << " from within oat file " << oat_file.GetLocation() 1593 << " error '" << error_msg << "'"; 1594 } 1595 1596 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1597 1598 AppendToBootClassPath(*dex_file, dex_cache); 1599 } 1600 1601 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1602 // bitmap walk. 1603 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1604 1605 // Set entry point to interpreter if in InterpretOnly mode. 1606 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1607 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1608 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1609 } 1610 1611 // reinit class_roots_ 1612 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1613 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1614 1615 // reinit array_iftable_ from any array class instance, they should be == 1616 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1617 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1618 // String class root was set above 1619 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1620 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1621 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1622 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1623 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1624 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1625 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1626 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1627 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1628 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1629 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1630 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1631 1632 FinishInit(self); 1633 1634 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1635} 1636 1637void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1638 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1639 if ((flags & kVisitRootFlagAllRoots) != 0) { 1640 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1641 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1642 } 1643 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1644 for (auto& pair : new_class_roots_) { 1645 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1646 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1647 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1648 if (UNLIKELY(new_ref != old_ref)) { 1649 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1650 // corresponding object. This is slow, but luckily for us, this may only happen with a 1651 // concurrent moving GC. 1652 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1653 it != end && it->first == pair.first; ++it) { 1654 // If the class stored matches the old class, update it to the new value. 1655 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1656 it->second = GcRoot<mirror::Class>(new_ref); 1657 } 1658 } 1659 } 1660 } 1661 } 1662 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1663 new_class_roots_.clear(); 1664 } 1665 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1666 log_new_class_table_roots_ = true; 1667 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1668 log_new_class_table_roots_ = false; 1669 } 1670 // We deliberately ignore the class roots in the image since we 1671 // handle image roots by using the MS/CMS rescanning of dirty cards. 1672} 1673 1674// Keep in sync with InitCallback. Anything we visit, we need to 1675// reinit references to when reinitializing a ClassLinker from a 1676// mapped image. 1677void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1678 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1679 Thread* self = Thread::Current(); 1680 { 1681 ReaderMutexLock mu(self, dex_lock_); 1682 if ((flags & kVisitRootFlagAllRoots) != 0) { 1683 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1684 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1685 } 1686 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1687 for (size_t index : new_dex_cache_roots_) { 1688 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1689 } 1690 } 1691 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1692 new_dex_cache_roots_.clear(); 1693 } 1694 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1695 log_new_dex_caches_roots_ = true; 1696 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1697 log_new_dex_caches_roots_ = false; 1698 } 1699 } 1700 VisitClassRoots(callback, arg, flags); 1701 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1702 DCHECK(!array_iftable_.IsNull()); 1703 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1704 if (!find_array_class_cache_[i].IsNull()) { 1705 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1706 } 1707 } 1708} 1709 1710void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1711 if (dex_cache_image_class_lookup_required_) { 1712 MoveImageClassesToClassTable(); 1713 } 1714 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1715 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1716 mirror::Class* c = it.second.Read(); 1717 if (!visitor(c, arg)) { 1718 return; 1719 } 1720 } 1721} 1722 1723static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1724 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1725 classes->insert(c); 1726 return true; 1727} 1728 1729void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1730 std::set<mirror::Class*> classes; 1731 VisitClasses(GetClassesVisitor, &classes); 1732 for (mirror::Class* klass : classes) { 1733 if (!visitor(klass, arg)) { 1734 return; 1735 } 1736 } 1737} 1738 1739ClassLinker::~ClassLinker() { 1740 mirror::Class::ResetClass(); 1741 mirror::String::ResetClass(); 1742 mirror::Reference::ResetClass(); 1743 mirror::ArtField::ResetClass(); 1744 mirror::ArtMethod::ResetClass(); 1745 mirror::BooleanArray::ResetArrayClass(); 1746 mirror::ByteArray::ResetArrayClass(); 1747 mirror::CharArray::ResetArrayClass(); 1748 mirror::DoubleArray::ResetArrayClass(); 1749 mirror::FloatArray::ResetArrayClass(); 1750 mirror::IntArray::ResetArrayClass(); 1751 mirror::LongArray::ResetArrayClass(); 1752 mirror::ShortArray::ResetArrayClass(); 1753 mirror::Throwable::ResetClass(); 1754 mirror::StackTraceElement::ResetClass(); 1755 STLDeleteElements(&boot_class_path_); 1756 STLDeleteElements(&oat_files_); 1757} 1758 1759mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1760 gc::Heap* heap = Runtime::Current()->GetHeap(); 1761 StackHandleScope<16> hs(self); 1762 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1763 Handle<mirror::DexCache> dex_cache( 1764 hs.NewHandle(down_cast<mirror::DexCache*>( 1765 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1766 VoidFunctor())))); 1767 if (dex_cache.Get() == NULL) { 1768 return NULL; 1769 } 1770 Handle<mirror::String> 1771 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1772 if (location.Get() == NULL) { 1773 return NULL; 1774 } 1775 Handle<mirror::ObjectArray<mirror::String>> 1776 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1777 if (strings.Get() == NULL) { 1778 return NULL; 1779 } 1780 Handle<mirror::ObjectArray<mirror::Class>> 1781 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1782 if (types.Get() == NULL) { 1783 return NULL; 1784 } 1785 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1786 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1787 if (methods.Get() == NULL) { 1788 return NULL; 1789 } 1790 Handle<mirror::ObjectArray<mirror::ArtField>> 1791 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1792 if (fields.Get() == NULL) { 1793 return NULL; 1794 } 1795 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1796 fields.Get()); 1797 return dex_cache.Get(); 1798} 1799 1800mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1801 uint32_t class_size) { 1802 DCHECK_GE(class_size, sizeof(mirror::Class)); 1803 gc::Heap* heap = Runtime::Current()->GetHeap(); 1804 mirror::Class::InitializeClassVisitor visitor(class_size); 1805 mirror::Object* k = kMovingClasses ? 1806 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1807 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1808 if (UNLIKELY(k == nullptr)) { 1809 CHECK(self->IsExceptionPending()); // OOME. 1810 return nullptr; 1811 } 1812 return k->AsClass(); 1813} 1814 1815mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1816 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1817} 1818 1819mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1820 return down_cast<mirror::ArtField*>( 1821 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1822} 1823 1824mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1825 return down_cast<mirror::ArtMethod*>( 1826 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1827} 1828 1829mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1830 Thread* self, size_t length) { 1831 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1832 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1833} 1834 1835mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1836 mirror::Class* klass) { 1837 DCHECK(klass != NULL); 1838 1839 // For temporary classes we must wait for them to be retired. 1840 if (init_done_ && klass->IsTemp()) { 1841 CHECK(!klass->IsResolved()); 1842 if (klass->IsErroneous()) { 1843 ThrowEarlierClassFailure(klass); 1844 return nullptr; 1845 } 1846 StackHandleScope<1> hs(self); 1847 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1848 ObjectLock<mirror::Class> lock(self, h_class); 1849 // Loop and wait for the resolving thread to retire this class. 1850 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1851 lock.WaitIgnoringInterrupts(); 1852 } 1853 if (h_class->IsErroneous()) { 1854 ThrowEarlierClassFailure(h_class.Get()); 1855 return nullptr; 1856 } 1857 CHECK(h_class->IsRetired()); 1858 // Get the updated class from class table. 1859 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1860 } 1861 1862 // Wait for the class if it has not already been linked. 1863 if (!klass->IsResolved() && !klass->IsErroneous()) { 1864 StackHandleScope<1> hs(self); 1865 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1866 ObjectLock<mirror::Class> lock(self, h_class); 1867 // Check for circular dependencies between classes. 1868 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1869 ThrowClassCircularityError(h_class.Get()); 1870 h_class->SetStatus(mirror::Class::kStatusError, self); 1871 return nullptr; 1872 } 1873 // Wait for the pending initialization to complete. 1874 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1875 lock.WaitIgnoringInterrupts(); 1876 } 1877 } 1878 1879 if (klass->IsErroneous()) { 1880 ThrowEarlierClassFailure(klass); 1881 return nullptr; 1882 } 1883 // Return the loaded class. No exceptions should be pending. 1884 CHECK(klass->IsResolved()) << PrettyClass(klass); 1885 self->AssertNoPendingException(); 1886 return klass; 1887} 1888 1889mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1890 Handle<mirror::ClassLoader> class_loader) { 1891 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1892 DCHECK(self != nullptr); 1893 self->AssertNoPendingException(); 1894 if (descriptor[1] == '\0') { 1895 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1896 // for primitive classes that aren't backed by dex files. 1897 return FindPrimitiveClass(descriptor[0]); 1898 } 1899 // Find the class in the loaded classes table. 1900 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1901 if (klass != NULL) { 1902 return EnsureResolved(self, descriptor, klass); 1903 } 1904 // Class is not yet loaded. 1905 if (descriptor[0] == '[') { 1906 return CreateArrayClass(self, descriptor, class_loader); 1907 } else if (class_loader.Get() == nullptr) { 1908 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1909 if (pair.second != NULL) { 1910 StackHandleScope<1> hs(self); 1911 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1912 } 1913 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1914 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1915 // throw of a NoClassDefFoundError. 1916 if (IsInBootClassPath(descriptor)) { 1917 mirror::Class* system_class = FindSystemClass(self, descriptor); 1918 CHECK(system_class != NULL); 1919 return system_class; 1920 } 1921 // Next try the compile time class path. 1922 const std::vector<const DexFile*>* class_path; 1923 { 1924 ScopedObjectAccessUnchecked soa(self); 1925 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1926 soa.AddLocalReference<jobject>(class_loader.Get())); 1927 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1928 } 1929 1930 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1931 if (pair.second != NULL) { 1932 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1933 } 1934 1935 } else { 1936 ScopedObjectAccessUnchecked soa(self); 1937 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1938 soa.AddLocalReference<jobject>(class_loader.Get())); 1939 std::string class_name_string(DescriptorToDot(descriptor)); 1940 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1941 { 1942 ScopedThreadStateChange tsc(self, kNative); 1943 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1944 soa.Env()->NewStringUTF(class_name_string.c_str())); 1945 if (class_name_object.get() == NULL) { 1946 return NULL; 1947 } 1948 CHECK(class_loader_object.get() != NULL); 1949 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1950 WellKnownClasses::java_lang_ClassLoader_loadClass, 1951 class_name_object.get())); 1952 } 1953 if (self->IsExceptionPending()) { 1954 // If the ClassLoader threw, pass that exception up. 1955 return NULL; 1956 } else if (result.get() == NULL) { 1957 // broken loader - throw NPE to be compatible with Dalvik 1958 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1959 class_name_string.c_str()).c_str()); 1960 return NULL; 1961 } else { 1962 // success, return mirror::Class* 1963 return soa.Decode<mirror::Class*>(result.get()); 1964 } 1965 } 1966 1967 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1968 return NULL; 1969} 1970 1971mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1972 Handle<mirror::ClassLoader> class_loader, 1973 const DexFile& dex_file, 1974 const DexFile::ClassDef& dex_class_def) { 1975 Thread* self = Thread::Current(); 1976 StackHandleScope<3> hs(self); 1977 auto klass = hs.NewHandle<mirror::Class>(nullptr); 1978 bool should_allocate = false; 1979 1980 // Load the class from the dex file. 1981 if (UNLIKELY(!init_done_)) { 1982 // finish up init of hand crafted class_roots_ 1983 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1984 klass.Assign(GetClassRoot(kJavaLangObject)); 1985 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1986 klass.Assign(GetClassRoot(kJavaLangClass)); 1987 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1988 klass.Assign(GetClassRoot(kJavaLangString)); 1989 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 1990 klass.Assign(GetClassRoot(kJavaLangRefReference)); 1991 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1992 klass.Assign(GetClassRoot(kJavaLangDexCache)); 1993 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1994 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 1995 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1996 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 1997 } else { 1998 should_allocate = true; 1999 } 2000 } else { 2001 should_allocate = true; 2002 } 2003 2004 if (should_allocate) { 2005 // Allocate a class with the status of not ready. 2006 // Interface object should get the right size here. Regular class will 2007 // figure out the right size later and be replaced with one of the right 2008 // size when the class becomes resolved. 2009 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2010 } 2011 if (UNLIKELY(klass.Get() == nullptr)) { 2012 CHECK(self->IsExceptionPending()); // Expect an OOME. 2013 return nullptr; 2014 } 2015 klass->SetDexCache(FindDexCache(dex_file)); 2016 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 2017 ObjectLock<mirror::Class> lock(self, klass); 2018 if (self->IsExceptionPending()) { 2019 // An exception occured during load, set status to erroneous while holding klass' lock in case 2020 // notification is necessary. 2021 if (!klass->IsErroneous()) { 2022 klass->SetStatus(mirror::Class::kStatusError, self); 2023 } 2024 return nullptr; 2025 } 2026 klass->SetClinitThreadId(self->GetTid()); 2027 2028 // Add the newly loaded class to the loaded classes table. 2029 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 2030 if (existing != nullptr) { 2031 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2032 // this thread to block. 2033 return EnsureResolved(self, descriptor, existing); 2034 } 2035 2036 // Finish loading (if necessary) by finding parents 2037 CHECK(!klass->IsLoaded()); 2038 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2039 // Loading failed. 2040 if (!klass->IsErroneous()) { 2041 klass->SetStatus(mirror::Class::kStatusError, self); 2042 } 2043 return nullptr; 2044 } 2045 CHECK(klass->IsLoaded()); 2046 // Link the class (if necessary) 2047 CHECK(!klass->IsResolved()); 2048 // TODO: Use fast jobjects? 2049 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2050 2051 mirror::Class* new_class = nullptr; 2052 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2053 // Linking failed. 2054 if (!klass->IsErroneous()) { 2055 klass->SetStatus(mirror::Class::kStatusError, self); 2056 } 2057 return nullptr; 2058 } 2059 CHECK(new_class != nullptr) << descriptor; 2060 CHECK(new_class->IsResolved()) << descriptor; 2061 2062 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2063 2064 /* 2065 * We send CLASS_PREPARE events to the debugger from here. The 2066 * definition of "preparation" is creating the static fields for a 2067 * class and initializing them to the standard default values, but not 2068 * executing any code (that comes later, during "initialization"). 2069 * 2070 * We did the static preparation in LinkClass. 2071 * 2072 * The class has been prepared and resolved but possibly not yet verified 2073 * at this point. 2074 */ 2075 Dbg::PostClassPrepare(new_class_h.Get()); 2076 2077 return new_class_h.Get(); 2078} 2079 2080uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2081 const DexFile::ClassDef& dex_class_def) { 2082 const byte* class_data = dex_file.GetClassData(dex_class_def); 2083 size_t num_ref = 0; 2084 size_t num_32 = 0; 2085 size_t num_64 = 0; 2086 if (class_data != NULL) { 2087 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2088 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2089 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2090 char c = descriptor[0]; 2091 if (c == 'L' || c == '[') { 2092 num_ref++; 2093 } else if (c == 'J' || c == 'D') { 2094 num_64++; 2095 } else { 2096 num_32++; 2097 } 2098 } 2099 } 2100 return mirror::Class::ComputeClassSize(false, 0, num_32, num_64, num_ref); 2101} 2102 2103bool ClassLinker::FindOatClass(const DexFile& dex_file, 2104 uint16_t class_def_idx, 2105 OatFile::OatClass* oat_class) { 2106 DCHECK(oat_class != nullptr); 2107 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2108 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2109 if (oat_file == nullptr) { 2110 return false; 2111 } 2112 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2113 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2114 &dex_location_checksum); 2115 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 2116 *oat_class = oat_dex_file->GetOatClass(class_def_idx); 2117 return true; 2118} 2119 2120static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2121 uint32_t method_idx) { 2122 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2123 const byte* class_data = dex_file.GetClassData(class_def); 2124 CHECK(class_data != NULL); 2125 ClassDataItemIterator it(dex_file, class_data); 2126 // Skip fields 2127 while (it.HasNextStaticField()) { 2128 it.Next(); 2129 } 2130 while (it.HasNextInstanceField()) { 2131 it.Next(); 2132 } 2133 // Process methods 2134 size_t class_def_method_index = 0; 2135 while (it.HasNextDirectMethod()) { 2136 if (it.GetMemberIndex() == method_idx) { 2137 return class_def_method_index; 2138 } 2139 class_def_method_index++; 2140 it.Next(); 2141 } 2142 while (it.HasNextVirtualMethod()) { 2143 if (it.GetMemberIndex() == method_idx) { 2144 return class_def_method_index; 2145 } 2146 class_def_method_index++; 2147 it.Next(); 2148 } 2149 DCHECK(!it.HasNext()); 2150 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2151 return 0; 2152} 2153 2154bool ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, OatFile::OatMethod* oat_method) { 2155 DCHECK(oat_method != nullptr); 2156 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2157 // method for direct methods (or virtual methods made direct). 2158 mirror::Class* declaring_class = method->GetDeclaringClass(); 2159 size_t oat_method_index; 2160 if (method->IsStatic() || method->IsDirect()) { 2161 // Simple case where the oat method index was stashed at load time. 2162 oat_method_index = method->GetMethodIndex(); 2163 } else { 2164 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2165 // by search for its position in the declared virtual methods. 2166 oat_method_index = declaring_class->NumDirectMethods(); 2167 size_t end = declaring_class->NumVirtualMethods(); 2168 bool found = false; 2169 for (size_t i = 0; i < end; i++) { 2170 if (declaring_class->GetVirtualMethod(i) == method) { 2171 found = true; 2172 break; 2173 } 2174 oat_method_index++; 2175 } 2176 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2177 } 2178 DCHECK_EQ(oat_method_index, 2179 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2180 method->GetDeclaringClass()->GetDexClassDefIndex(), 2181 method->GetDexMethodIndex())); 2182 OatFile::OatClass oat_class; 2183 if (!FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2184 declaring_class->GetDexClassDefIndex(), 2185 &oat_class)) { 2186 return false; 2187 } 2188 2189 *oat_method = oat_class.GetOatMethod(oat_method_index); 2190 return true; 2191} 2192 2193// Special case to get oat code without overwriting a trampoline. 2194const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2195 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2196 if (method->IsProxyMethod()) { 2197 return GetQuickProxyInvokeHandler(); 2198 } 2199 OatFile::OatMethod oat_method; 2200 const void* result = nullptr; 2201 if (FindOatMethodFor(method, &oat_method)) { 2202 result = oat_method.GetQuickCode(); 2203 } 2204 2205 if (result == nullptr) { 2206 if (method->IsNative()) { 2207 // No code and native? Use generic trampoline. 2208 result = GetQuickGenericJniTrampoline(); 2209 } else if (method->IsPortableCompiled()) { 2210 // No code? Do we expect portable code? 2211 result = GetQuickToPortableBridge(); 2212 } else { 2213 // No code? You must mean to go into the interpreter. 2214 result = GetQuickToInterpreterBridge(); 2215 } 2216 } 2217 return result; 2218} 2219 2220const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2221 bool* have_portable_code) { 2222 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2223 *have_portable_code = false; 2224 if (method->IsProxyMethod()) { 2225 return GetPortableProxyInvokeHandler(); 2226 } 2227 OatFile::OatMethod oat_method; 2228 const void* result = nullptr; 2229 const void* quick_code = nullptr; 2230 if (FindOatMethodFor(method, &oat_method)) { 2231 result = oat_method.GetPortableCode(); 2232 quick_code = oat_method.GetQuickCode(); 2233 } 2234 2235 if (result == nullptr) { 2236 if (quick_code == nullptr) { 2237 // No code? You must mean to go into the interpreter. 2238 result = GetPortableToInterpreterBridge(); 2239 } else { 2240 // No code? But there's quick code, so use a bridge. 2241 result = GetPortableToQuickBridge(); 2242 } 2243 } else { 2244 *have_portable_code = true; 2245 } 2246 return result; 2247} 2248 2249const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2250 uint32_t method_idx) { 2251 OatFile::OatClass oat_class; 2252 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2253 return nullptr; 2254 } 2255 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2256 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2257} 2258 2259const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2260 uint32_t method_idx) { 2261 OatFile::OatClass oat_class; 2262 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2263 return nullptr; 2264 } 2265 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2266 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2267} 2268 2269// Returns true if the method must run with interpreter, false otherwise. 2270static bool NeedsInterpreter( 2271 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2272 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2273 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2274 // No code: need interpreter. 2275 // May return true for native code, in the case of generic JNI 2276 // DCHECK(!method->IsNative()); 2277 return true; 2278 } 2279#ifdef ART_SEA_IR_MODE 2280 ScopedObjectAccess soa(Thread::Current()); 2281 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2282 LOG(INFO) << "Found " << PrettyMethod(method); 2283 return false; 2284 } 2285#endif 2286 // If interpreter mode is enabled, every method (except native and proxy) must 2287 // be run with interpreter. 2288 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2289 !method->IsNative() && !method->IsProxyMethod(); 2290} 2291 2292void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2293 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2294 if (klass->NumDirectMethods() == 0) { 2295 return; // No direct methods => no static methods. 2296 } 2297 Runtime* runtime = Runtime::Current(); 2298 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2299 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2300 return; // OAT file unavailable. 2301 } 2302 } 2303 2304 const DexFile& dex_file = klass->GetDexFile(); 2305 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2306 CHECK(dex_class_def != nullptr); 2307 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2308 // There should always be class data if there were direct methods. 2309 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2310 ClassDataItemIterator it(dex_file, class_data); 2311 // Skip fields 2312 while (it.HasNextStaticField()) { 2313 it.Next(); 2314 } 2315 while (it.HasNextInstanceField()) { 2316 it.Next(); 2317 } 2318 OatFile::OatClass oat_class; 2319 bool has_oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class); 2320 // Link the code of methods skipped by LinkCode. 2321 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2322 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2323 if (!method->IsStatic()) { 2324 // Only update static methods. 2325 continue; 2326 } 2327 const void* portable_code = nullptr; 2328 const void* quick_code = nullptr; 2329 if (has_oat_class) { 2330 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2331 portable_code = oat_method.GetPortableCode(); 2332 quick_code = oat_method.GetQuickCode(); 2333 } 2334 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2335 bool have_portable_code = false; 2336 if (enter_interpreter) { 2337 // Use interpreter entry point. 2338 // Check whether the method is native, in which case it's generic JNI. 2339 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2340 quick_code = GetQuickGenericJniTrampoline(); 2341 portable_code = GetPortableToQuickBridge(); 2342 } else { 2343 portable_code = GetPortableToInterpreterBridge(); 2344 quick_code = GetQuickToInterpreterBridge(); 2345 } 2346 } else { 2347 if (portable_code == nullptr) { 2348 portable_code = GetPortableToQuickBridge(); 2349 } else { 2350 have_portable_code = true; 2351 } 2352 if (quick_code == nullptr) { 2353 quick_code = GetQuickToPortableBridge(); 2354 } 2355 } 2356 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2357 have_portable_code); 2358 } 2359 // Ignore virtual methods on the iterator. 2360} 2361 2362void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 2363 const DexFile& dex_file, uint32_t dex_method_index, 2364 uint32_t method_index) { 2365 if (Runtime::Current()->IsCompiler()) { 2366 // The following code only applies to a non-compiler runtime. 2367 return; 2368 } 2369 // Method shouldn't have already been linked. 2370 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2371 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2372 if (oat_class != nullptr) { 2373 // Every kind of method should at least get an invoke stub from the oat_method. 2374 // non-abstract methods also get their code pointers. 2375 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2376 oat_method.LinkMethod(method.Get()); 2377 } 2378 2379 // Install entry point from interpreter. 2380 bool enter_interpreter = NeedsInterpreter(method.Get(), 2381 method->GetEntryPointFromQuickCompiledCode(), 2382 method->GetEntryPointFromPortableCompiledCode()); 2383 if (enter_interpreter && !method->IsNative()) { 2384 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2385 } else { 2386 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2387 } 2388 2389 if (method->IsAbstract()) { 2390 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2391 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2392 return; 2393 } 2394 2395 bool have_portable_code = false; 2396 if (method->IsStatic() && !method->IsConstructor()) { 2397 // For static methods excluding the class initializer, install the trampoline. 2398 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2399 // after initializing class (see ClassLinker::InitializeClass method). 2400 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2401 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2402 } else if (enter_interpreter) { 2403 if (!method->IsNative()) { 2404 // Set entry point from compiled code if there's no code or in interpreter only mode. 2405 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2406 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2407 } else { 2408 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2409 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2410 } 2411 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2412 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2413 have_portable_code = true; 2414 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2415 } else { 2416 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2417 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2418 } 2419 2420 if (method->IsNative()) { 2421 // Unregistering restores the dlsym lookup stub. 2422 method->UnregisterNative(Thread::Current()); 2423 2424 if (enter_interpreter) { 2425 // We have a native method here without code. Then it should have either the GenericJni 2426 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2427 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2428 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2429 } 2430 } 2431 2432 // Allow instrumentation its chance to hijack code. 2433 Runtime* runtime = Runtime::Current(); 2434 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2435 method->GetEntryPointFromQuickCompiledCode(), 2436 method->GetEntryPointFromPortableCompiledCode(), 2437 have_portable_code); 2438} 2439 2440void ClassLinker::LoadClass(const DexFile& dex_file, 2441 const DexFile::ClassDef& dex_class_def, 2442 Handle<mirror::Class> klass, 2443 mirror::ClassLoader* class_loader) { 2444 CHECK(klass.Get() != NULL); 2445 CHECK(klass->GetDexCache() != NULL); 2446 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2447 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2448 CHECK(descriptor != NULL); 2449 2450 klass->SetClass(GetClassRoot(kJavaLangClass)); 2451 if (kUseBakerOrBrooksReadBarrier) { 2452 klass->AssertReadBarrierPointer(); 2453 } 2454 uint32_t access_flags = dex_class_def.access_flags_; 2455 // Make sure that none of our runtime-only flags are set. 2456 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2457 klass->SetAccessFlags(access_flags); 2458 klass->SetClassLoader(class_loader); 2459 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2460 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2461 2462 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2463 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2464 2465 const byte* class_data = dex_file.GetClassData(dex_class_def); 2466 if (class_data == NULL) { 2467 return; // no fields or methods - for example a marker interface 2468 } 2469 2470 OatFile::OatClass oat_class; 2471 if (Runtime::Current()->IsStarted() 2472 && !Runtime::Current()->UseCompileTimeClassPath() 2473 && FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class)) { 2474 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2475 } else { 2476 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2477 } 2478} 2479 2480void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2481 const byte* class_data, 2482 Handle<mirror::Class> klass, 2483 mirror::ClassLoader* class_loader, 2484 const OatFile::OatClass* oat_class) { 2485 // Load fields. 2486 ClassDataItemIterator it(dex_file, class_data); 2487 Thread* self = Thread::Current(); 2488 if (it.NumStaticFields() != 0) { 2489 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2490 if (UNLIKELY(statics == NULL)) { 2491 CHECK(self->IsExceptionPending()); // OOME. 2492 return; 2493 } 2494 klass->SetSFields(statics); 2495 } 2496 if (it.NumInstanceFields() != 0) { 2497 mirror::ObjectArray<mirror::ArtField>* fields = 2498 AllocArtFieldArray(self, it.NumInstanceFields()); 2499 if (UNLIKELY(fields == NULL)) { 2500 CHECK(self->IsExceptionPending()); // OOME. 2501 return; 2502 } 2503 klass->SetIFields(fields); 2504 } 2505 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2506 StackHandleScope<1> hs(self); 2507 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2508 if (UNLIKELY(sfield.Get() == NULL)) { 2509 CHECK(self->IsExceptionPending()); // OOME. 2510 return; 2511 } 2512 klass->SetStaticField(i, sfield.Get()); 2513 LoadField(dex_file, it, klass, sfield); 2514 } 2515 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2516 StackHandleScope<1> hs(self); 2517 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2518 if (UNLIKELY(ifield.Get() == NULL)) { 2519 CHECK(self->IsExceptionPending()); // OOME. 2520 return; 2521 } 2522 klass->SetInstanceField(i, ifield.Get()); 2523 LoadField(dex_file, it, klass, ifield); 2524 } 2525 2526 // Load methods. 2527 if (it.NumDirectMethods() != 0) { 2528 // TODO: append direct methods to class object 2529 mirror::ObjectArray<mirror::ArtMethod>* directs = 2530 AllocArtMethodArray(self, it.NumDirectMethods()); 2531 if (UNLIKELY(directs == NULL)) { 2532 CHECK(self->IsExceptionPending()); // OOME. 2533 return; 2534 } 2535 klass->SetDirectMethods(directs); 2536 } 2537 if (it.NumVirtualMethods() != 0) { 2538 // TODO: append direct methods to class object 2539 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2540 AllocArtMethodArray(self, it.NumVirtualMethods()); 2541 if (UNLIKELY(virtuals == NULL)) { 2542 CHECK(self->IsExceptionPending()); // OOME. 2543 return; 2544 } 2545 klass->SetVirtualMethods(virtuals); 2546 } 2547 size_t class_def_method_index = 0; 2548 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2549 StackHandleScope<1> hs(self); 2550 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2551 if (UNLIKELY(method.Get() == NULL)) { 2552 CHECK(self->IsExceptionPending()); // OOME. 2553 return; 2554 } 2555 klass->SetDirectMethod(i, method.Get()); 2556 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2557 method->SetMethodIndex(class_def_method_index); 2558 class_def_method_index++; 2559 } 2560 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2561 StackHandleScope<1> hs(self); 2562 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2563 if (UNLIKELY(method.Get() == NULL)) { 2564 CHECK(self->IsExceptionPending()); // OOME. 2565 return; 2566 } 2567 klass->SetVirtualMethod(i, method.Get()); 2568 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2569 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2570 class_def_method_index++; 2571 } 2572 DCHECK(!it.HasNext()); 2573} 2574 2575void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2576 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2577 uint32_t field_idx = it.GetMemberIndex(); 2578 dst->SetDexFieldIndex(field_idx); 2579 dst->SetDeclaringClass(klass.Get()); 2580 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2581} 2582 2583mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2584 const ClassDataItemIterator& it, 2585 Handle<mirror::Class> klass) { 2586 uint32_t dex_method_idx = it.GetMemberIndex(); 2587 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2588 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2589 2590 mirror::ArtMethod* dst = AllocArtMethod(self); 2591 if (UNLIKELY(dst == NULL)) { 2592 CHECK(self->IsExceptionPending()); // OOME. 2593 return NULL; 2594 } 2595 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2596 2597 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2598 dst->SetDexMethodIndex(dex_method_idx); 2599 dst->SetDeclaringClass(klass.Get()); 2600 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2601 2602 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2603 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2604 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2605 2606 uint32_t access_flags = it.GetMemberAccessFlags(); 2607 2608 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2609 // Set finalizable flag on declaring class. 2610 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2611 // Void return type. 2612 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged. 2613 klass->SetFinalizable(); 2614 } else { 2615 std::string temp; 2616 const char* klass_descriptor = klass->GetDescriptor(&temp); 2617 // The Enum class declares a "final" finalize() method to prevent subclasses from 2618 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2619 // subclasses, so we exclude it here. 2620 // We also want to avoid setting the flag on Object, where we know that finalize() is 2621 // empty. 2622 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2623 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2624 klass->SetFinalizable(); 2625 } 2626 } 2627 } 2628 } else if (method_name[0] == '<') { 2629 // Fix broken access flags for initializers. Bug 11157540. 2630 bool is_init = (strcmp("<init>", method_name) == 0); 2631 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2632 if (UNLIKELY(!is_init && !is_clinit)) { 2633 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2634 } else { 2635 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2636 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2637 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2638 access_flags |= kAccConstructor; 2639 } 2640 } 2641 } 2642 dst->SetAccessFlags(access_flags); 2643 2644 self->EndAssertNoThreadSuspension(old_cause); 2645 return dst; 2646} 2647 2648void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2649 Thread* self = Thread::Current(); 2650 StackHandleScope<1> hs(self); 2651 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2652 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2653 AppendToBootClassPath(dex_file, dex_cache); 2654} 2655 2656void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2657 Handle<mirror::DexCache> dex_cache) { 2658 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2659 boot_class_path_.push_back(&dex_file); 2660 RegisterDexFile(dex_file, dex_cache); 2661} 2662 2663bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2664 dex_lock_.AssertSharedHeld(Thread::Current()); 2665 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2666 mirror::DexCache* dex_cache = GetDexCache(i); 2667 if (dex_cache->GetDexFile() == &dex_file) { 2668 return true; 2669 } 2670 } 2671 return false; 2672} 2673 2674bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2675 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2676 return IsDexFileRegisteredLocked(dex_file); 2677} 2678 2679void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2680 Handle<mirror::DexCache> dex_cache) { 2681 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2682 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2683 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2684 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2685 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2686 dex_cache->SetDexFile(&dex_file); 2687 if (log_new_dex_caches_roots_) { 2688 // TODO: This is not safe if we can remove dex caches. 2689 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2690 } 2691} 2692 2693void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2694 Thread* self = Thread::Current(); 2695 { 2696 ReaderMutexLock mu(self, dex_lock_); 2697 if (IsDexFileRegisteredLocked(dex_file)) { 2698 return; 2699 } 2700 } 2701 // Don't alloc while holding the lock, since allocation may need to 2702 // suspend all threads and another thread may need the dex_lock_ to 2703 // get to a suspend point. 2704 StackHandleScope<1> hs(self); 2705 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2706 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2707 { 2708 WriterMutexLock mu(self, dex_lock_); 2709 if (IsDexFileRegisteredLocked(dex_file)) { 2710 return; 2711 } 2712 RegisterDexFileLocked(dex_file, dex_cache); 2713 } 2714} 2715 2716void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2717 Handle<mirror::DexCache> dex_cache) { 2718 WriterMutexLock mu(Thread::Current(), dex_lock_); 2719 RegisterDexFileLocked(dex_file, dex_cache); 2720} 2721 2722mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2723 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2724 // Search assuming unique-ness of dex file. 2725 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2726 mirror::DexCache* dex_cache = GetDexCache(i); 2727 if (dex_cache->GetDexFile() == &dex_file) { 2728 return dex_cache; 2729 } 2730 } 2731 // Search matching by location name. 2732 std::string location(dex_file.GetLocation()); 2733 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2734 mirror::DexCache* dex_cache = GetDexCache(i); 2735 if (dex_cache->GetDexFile()->GetLocation() == location) { 2736 return dex_cache; 2737 } 2738 } 2739 // Failure, dump diagnostic and abort. 2740 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2741 mirror::DexCache* dex_cache = GetDexCache(i); 2742 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2743 } 2744 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2745 return NULL; 2746} 2747 2748void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2749 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2750 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2751 mirror::DexCache* dex_cache = GetDexCache(i); 2752 dex_cache->Fixup(resolution_method); 2753 } 2754} 2755 2756mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2757 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 2758 if (UNLIKELY(klass == NULL)) { 2759 return NULL; 2760 } 2761 return InitializePrimitiveClass(klass, type); 2762} 2763 2764mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2765 Primitive::Type type) { 2766 CHECK(primitive_class != NULL); 2767 // Must hold lock on object when initializing. 2768 Thread* self = Thread::Current(); 2769 StackHandleScope<1> hs(self); 2770 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2771 ObjectLock<mirror::Class> lock(self, h_class); 2772 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2773 primitive_class->SetPrimitiveType(type); 2774 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2775 const char* descriptor = Primitive::Descriptor(type); 2776 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2777 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2778 return primitive_class; 2779} 2780 2781// Create an array class (i.e. the class object for the array, not the 2782// array itself). "descriptor" looks like "[C" or "[[[[B" or 2783// "[Ljava/lang/String;". 2784// 2785// If "descriptor" refers to an array of primitives, look up the 2786// primitive type's internally-generated class object. 2787// 2788// "class_loader" is the class loader of the class that's referring to 2789// us. It's used to ensure that we're looking for the element type in 2790// the right context. It does NOT become the class loader for the 2791// array class; that always comes from the base element class. 2792// 2793// Returns NULL with an exception raised on failure. 2794mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2795 Handle<mirror::ClassLoader> class_loader) { 2796 // Identify the underlying component type 2797 CHECK_EQ('[', descriptor[0]); 2798 StackHandleScope<2> hs(self); 2799 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2800 if (component_type.Get() == nullptr) { 2801 DCHECK(self->IsExceptionPending()); 2802 // We need to accept erroneous classes as component types. 2803 component_type.Assign(LookupClass(descriptor + 1, class_loader.Get())); 2804 if (component_type.Get() == nullptr) { 2805 DCHECK(self->IsExceptionPending()); 2806 return nullptr; 2807 } else { 2808 self->ClearException(); 2809 } 2810 } 2811 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2812 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2813 return nullptr; 2814 } 2815 // See if the component type is already loaded. Array classes are 2816 // always associated with the class loader of their underlying 2817 // element type -- an array of Strings goes with the loader for 2818 // java/lang/String -- so we need to look for it there. (The 2819 // caller should have checked for the existence of the class 2820 // before calling here, but they did so with *their* class loader, 2821 // not the component type's loader.) 2822 // 2823 // If we find it, the caller adds "loader" to the class' initiating 2824 // loader list, which should prevent us from going through this again. 2825 // 2826 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2827 // are the same, because our caller (FindClass) just did the 2828 // lookup. (Even if we get this wrong we still have correct behavior, 2829 // because we effectively do this lookup again when we add the new 2830 // class to the hash table --- necessary because of possible races with 2831 // other threads.) 2832 if (class_loader.Get() != component_type->GetClassLoader()) { 2833 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2834 if (new_class != NULL) { 2835 return new_class; 2836 } 2837 } 2838 2839 // Fill out the fields in the Class. 2840 // 2841 // It is possible to execute some methods against arrays, because 2842 // all arrays are subclasses of java_lang_Object_, so we need to set 2843 // up a vtable. We can just point at the one in java_lang_Object_. 2844 // 2845 // Array classes are simple enough that we don't need to do a full 2846 // link step. 2847 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2848 if (UNLIKELY(!init_done_)) { 2849 // Classes that were hand created, ie not by FindSystemClass 2850 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2851 new_class.Assign(GetClassRoot(kClassArrayClass)); 2852 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2853 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2854 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2855 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2856 } else if (strcmp(descriptor, 2857 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2858 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2859 } else if (strcmp(descriptor, 2860 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2861 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2862 } else if (strcmp(descriptor, "[C") == 0) { 2863 new_class.Assign(GetClassRoot(kCharArrayClass)); 2864 } else if (strcmp(descriptor, "[I") == 0) { 2865 new_class.Assign(GetClassRoot(kIntArrayClass)); 2866 } 2867 } 2868 if (new_class.Get() == nullptr) { 2869 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 2870 if (new_class.Get() == nullptr) { 2871 return nullptr; 2872 } 2873 new_class->SetComponentType(component_type.Get()); 2874 } 2875 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2876 DCHECK(new_class->GetComponentType() != NULL); 2877 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2878 new_class->SetSuperClass(java_lang_Object); 2879 new_class->SetVTable(java_lang_Object->GetVTable()); 2880 new_class->SetPrimitiveType(Primitive::kPrimNot); 2881 new_class->SetClassLoader(component_type->GetClassLoader()); 2882 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 2883 new_class->PopulateEmbeddedImtAndVTable(); 2884 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2885 // don't need to set new_class->SetObjectSize(..) 2886 // because Object::SizeOf delegates to Array::SizeOf 2887 2888 2889 // All arrays have java/lang/Cloneable and java/io/Serializable as 2890 // interfaces. We need to set that up here, so that stuff like 2891 // "instanceof" works right. 2892 // 2893 // Note: The GC could run during the call to FindSystemClass, 2894 // so we need to make sure the class object is GC-valid while we're in 2895 // there. Do this by clearing the interface list so the GC will just 2896 // think that the entries are null. 2897 2898 2899 // Use the single, global copies of "interfaces" and "iftable" 2900 // (remember not to free them for arrays). 2901 { 2902 mirror::IfTable* array_iftable = array_iftable_.Read(); 2903 CHECK(array_iftable != nullptr); 2904 new_class->SetIfTable(array_iftable); 2905 } 2906 2907 // Inherit access flags from the component type. 2908 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2909 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2910 access_flags &= kAccJavaFlagsMask; 2911 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2912 // and remove "interface". 2913 access_flags |= kAccAbstract | kAccFinal; 2914 access_flags &= ~kAccInterface; 2915 2916 new_class->SetAccessFlags(access_flags); 2917 2918 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2919 if (existing == nullptr) { 2920 return new_class.Get(); 2921 } 2922 // Another thread must have loaded the class after we 2923 // started but before we finished. Abandon what we've 2924 // done. 2925 // 2926 // (Yes, this happens.) 2927 2928 return existing; 2929} 2930 2931mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2932 switch (type) { 2933 case 'B': 2934 return GetClassRoot(kPrimitiveByte); 2935 case 'C': 2936 return GetClassRoot(kPrimitiveChar); 2937 case 'D': 2938 return GetClassRoot(kPrimitiveDouble); 2939 case 'F': 2940 return GetClassRoot(kPrimitiveFloat); 2941 case 'I': 2942 return GetClassRoot(kPrimitiveInt); 2943 case 'J': 2944 return GetClassRoot(kPrimitiveLong); 2945 case 'S': 2946 return GetClassRoot(kPrimitiveShort); 2947 case 'Z': 2948 return GetClassRoot(kPrimitiveBoolean); 2949 case 'V': 2950 return GetClassRoot(kPrimitiveVoid); 2951 default: 2952 break; 2953 } 2954 std::string printable_type(PrintableChar(type)); 2955 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2956 return NULL; 2957} 2958 2959mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2960 size_t hash) { 2961 if (VLOG_IS_ON(class_linker)) { 2962 mirror::DexCache* dex_cache = klass->GetDexCache(); 2963 std::string source; 2964 if (dex_cache != NULL) { 2965 source += " from "; 2966 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2967 } 2968 LOG(INFO) << "Loaded class " << descriptor << source; 2969 } 2970 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2971 mirror::Class* existing = 2972 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2973 if (existing != NULL) { 2974 return existing; 2975 } 2976 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == NULL && 2977 dex_cache_image_class_lookup_required_) { 2978 // Check a class loaded with the system class loader matches one in the image if the class 2979 // is in the image. 2980 existing = LookupClassFromImage(descriptor); 2981 if (existing != NULL) { 2982 CHECK(klass == existing); 2983 } 2984 } 2985 VerifyObject(klass); 2986 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 2987 if (log_new_class_table_roots_) { 2988 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 2989 } 2990 return NULL; 2991} 2992 2993mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 2994 size_t hash) { 2995 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2996 mirror::Class* existing = 2997 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2998 2999 if (existing == nullptr) { 3000 CHECK(klass->IsProxyClass()); 3001 return nullptr; 3002 } 3003 3004 CHECK_NE(existing, klass) << descriptor; 3005 CHECK(!existing->IsResolved()) << descriptor; 3006 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3007 3008 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 3009 ++it) { 3010 mirror::Class* klass = it->second.Read(); 3011 if (klass == existing) { 3012 class_table_.erase(it); 3013 break; 3014 } 3015 } 3016 3017 CHECK(!klass->IsTemp()) << descriptor; 3018 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3019 dex_cache_image_class_lookup_required_) { 3020 // Check a class loaded with the system class loader matches one in the image if the class 3021 // is in the image. 3022 existing = LookupClassFromImage(descriptor); 3023 if (existing != nullptr) { 3024 CHECK(klass == existing) << descriptor; 3025 } 3026 } 3027 VerifyObject(klass); 3028 3029 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3030 if (log_new_class_table_roots_) { 3031 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3032 } 3033 3034 return existing; 3035} 3036 3037bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 3038 size_t hash = Hash(descriptor); 3039 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3040 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3041 it != end && it->first == hash; 3042 ++it) { 3043 mirror::Class* klass = it->second.Read(); 3044 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3045 class_table_.erase(it); 3046 return true; 3047 } 3048 } 3049 return false; 3050} 3051 3052mirror::Class* ClassLinker::LookupClass(const char* descriptor, 3053 const mirror::ClassLoader* class_loader) { 3054 size_t hash = Hash(descriptor); 3055 { 3056 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3057 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3058 if (result != NULL) { 3059 return result; 3060 } 3061 } 3062 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 3063 return NULL; 3064 } else { 3065 // Lookup failed but need to search dex_caches_. 3066 mirror::Class* result = LookupClassFromImage(descriptor); 3067 if (result != NULL) { 3068 InsertClass(descriptor, result, hash); 3069 } else { 3070 // Searching the image dex files/caches failed, we don't want to get into this situation 3071 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3072 // classes into the class table. 3073 const int32_t kMaxFailedDexCacheLookups = 1000; 3074 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3075 MoveImageClassesToClassTable(); 3076 } 3077 } 3078 return result; 3079 } 3080} 3081 3082mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3083 const mirror::ClassLoader* class_loader, 3084 size_t hash) { 3085 auto end = class_table_.end(); 3086 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3087 mirror::Class* klass = it->second.Read(); 3088 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3089 if (kIsDebugBuild) { 3090 // Check for duplicates in the table. 3091 for (++it; it != end && it->first == hash; ++it) { 3092 mirror::Class* klass2 = it->second.Read(); 3093 CHECK(!(klass2->GetClassLoader() == class_loader && 3094 klass2->DescriptorEquals(descriptor))) 3095 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3096 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3097 } 3098 } 3099 return klass; 3100 } 3101 } 3102 return NULL; 3103} 3104 3105static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3106 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3107 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3108 CHECK(image != NULL); 3109 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3110 return root->AsObjectArray<mirror::DexCache>(); 3111} 3112 3113void ClassLinker::MoveImageClassesToClassTable() { 3114 Thread* self = Thread::Current(); 3115 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3116 if (!dex_cache_image_class_lookup_required_) { 3117 return; // All dex cache classes are already in the class table. 3118 } 3119 const char* old_no_suspend_cause = 3120 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 3121 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3122 std::string temp; 3123 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3124 mirror::DexCache* dex_cache = dex_caches->Get(i); 3125 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3126 for (int32_t j = 0; j < types->GetLength(); j++) { 3127 mirror::Class* klass = types->Get(j); 3128 if (klass != NULL) { 3129 DCHECK(klass->GetClassLoader() == NULL); 3130 const char* descriptor = klass->GetDescriptor(&temp); 3131 size_t hash = Hash(descriptor); 3132 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 3133 if (existing != NULL) { 3134 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3135 << PrettyClassAndClassLoader(klass); 3136 } else { 3137 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3138 if (log_new_class_table_roots_) { 3139 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3140 } 3141 } 3142 } 3143 } 3144 } 3145 dex_cache_image_class_lookup_required_ = false; 3146 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3147} 3148 3149mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3150 Thread* self = Thread::Current(); 3151 const char* old_no_suspend_cause = 3152 self->StartAssertNoThreadSuspension("Image class lookup"); 3153 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3154 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3155 mirror::DexCache* dex_cache = dex_caches->Get(i); 3156 const DexFile* dex_file = dex_cache->GetDexFile(); 3157 // Try binary searching the string/type index. 3158 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3159 if (string_id != NULL) { 3160 const DexFile::TypeId* type_id = 3161 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3162 if (type_id != NULL) { 3163 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3164 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3165 if (klass != NULL) { 3166 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3167 return klass; 3168 } 3169 } 3170 } 3171 } 3172 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3173 return NULL; 3174} 3175 3176void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3177 result.clear(); 3178 if (dex_cache_image_class_lookup_required_) { 3179 MoveImageClassesToClassTable(); 3180 } 3181 size_t hash = Hash(descriptor); 3182 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3183 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3184 it != end && it->first == hash; ++it) { 3185 mirror::Class* klass = it->second.Read(); 3186 if (klass->DescriptorEquals(descriptor)) { 3187 result.push_back(klass); 3188 } 3189 } 3190} 3191 3192void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 3193 // TODO: assert that the monitor on the Class is held 3194 Thread* self = Thread::Current(); 3195 ObjectLock<mirror::Class> lock(self, klass); 3196 3197 // Don't attempt to re-verify if already sufficiently verified. 3198 if (klass->IsVerified() || 3199 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 3200 return; 3201 } 3202 3203 // The class might already be erroneous, for example at compile time if we attempted to verify 3204 // this class as a parent to another. 3205 if (klass->IsErroneous()) { 3206 ThrowEarlierClassFailure(klass.Get()); 3207 return; 3208 } 3209 3210 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3211 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3212 } else { 3213 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3214 << PrettyClass(klass.Get()); 3215 CHECK(!Runtime::Current()->IsCompiler()); 3216 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3217 } 3218 3219 // Skip verification if disabled. 3220 if (!Runtime::Current()->IsVerificationEnabled()) { 3221 klass->SetStatus(mirror::Class::kStatusVerified, self); 3222 return; 3223 } 3224 3225 // Verify super class. 3226 StackHandleScope<2> hs(self); 3227 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3228 if (super.Get() != NULL) { 3229 // Acquire lock to prevent races on verifying the super class. 3230 ObjectLock<mirror::Class> lock(self, super); 3231 3232 if (!super->IsVerified() && !super->IsErroneous()) { 3233 VerifyClass(super); 3234 } 3235 if (!super->IsCompileTimeVerified()) { 3236 std::string error_msg( 3237 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3238 PrettyDescriptor(klass.Get()).c_str(), 3239 PrettyDescriptor(super.Get()).c_str())); 3240 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3241 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3242 if (cause.Get() != nullptr) { 3243 self->ClearException(); 3244 } 3245 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3246 if (cause.Get() != nullptr) { 3247 self->GetException(nullptr)->SetCause(cause.Get()); 3248 } 3249 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3250 if (Runtime::Current()->IsCompiler()) { 3251 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3252 } 3253 klass->SetStatus(mirror::Class::kStatusError, self); 3254 return; 3255 } 3256 } 3257 3258 // Try to use verification information from the oat file, otherwise do runtime verification. 3259 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3260 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3261 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3262 if (oat_file_class_status == mirror::Class::kStatusError) { 3263 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3264 << PrettyDescriptor(klass.Get()) << " in " 3265 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3266 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3267 PrettyDescriptor(klass.Get()).c_str()); 3268 klass->SetStatus(mirror::Class::kStatusError, self); 3269 return; 3270 } 3271 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3272 std::string error_msg; 3273 if (!preverified) { 3274 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 3275 Runtime::Current()->IsCompiler(), 3276 &error_msg); 3277 } 3278 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3279 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3280 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3281 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3282 << " because: " << error_msg; 3283 } 3284 self->AssertNoPendingException(); 3285 // Make sure all classes referenced by catch blocks are resolved. 3286 ResolveClassExceptionHandlerTypes(dex_file, klass); 3287 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3288 // Even though there were no verifier failures we need to respect whether the super-class 3289 // was verified or requiring runtime reverification. 3290 if (super.Get() == NULL || super->IsVerified()) { 3291 klass->SetStatus(mirror::Class::kStatusVerified, self); 3292 } else { 3293 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3294 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3295 // Pretend a soft failure occured so that we don't consider the class verified below. 3296 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3297 } 3298 } else { 3299 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3300 // Soft failures at compile time should be retried at runtime. Soft 3301 // failures at runtime will be handled by slow paths in the generated 3302 // code. Set status accordingly. 3303 if (Runtime::Current()->IsCompiler()) { 3304 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3305 } else { 3306 klass->SetStatus(mirror::Class::kStatusVerified, self); 3307 } 3308 } 3309 } else { 3310 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3311 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3312 << " because: " << error_msg; 3313 self->AssertNoPendingException(); 3314 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3315 klass->SetStatus(mirror::Class::kStatusError, self); 3316 } 3317 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3318 // Class is verified so we don't need to do any access check on its methods. 3319 // Let the interpreter know it by setting the kAccPreverified flag onto each 3320 // method. 3321 // Note: we're going here during compilation and at runtime. When we set the 3322 // kAccPreverified flag when compiling image classes, the flag is recorded 3323 // in the image and is set when loading the image. 3324 klass->SetPreverifiedFlagOnAllMethods(); 3325 } 3326} 3327 3328bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3329 mirror::Class::Status& oat_file_class_status) { 3330 // If we're compiling, we can only verify the class using the oat file if 3331 // we are not compiling the image or if the class we're verifying is not part of 3332 // the app. In other words, we will only check for preverification of bootclasspath 3333 // classes. 3334 if (Runtime::Current()->IsCompiler()) { 3335 // Are we compiling the bootclasspath? 3336 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3337 return false; 3338 } 3339 // We are compiling an app (not the image). 3340 3341 // Is this an app class? (I.e. not a bootclasspath class) 3342 if (klass->GetClassLoader() != NULL) { 3343 return false; 3344 } 3345 } 3346 3347 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 3348 // Make this work with gtests, which do not set up the image properly. 3349 // TODO: we should clean up gtests to set up the image path properly. 3350 if (Runtime::Current()->IsCompiler() || (oat_file == NULL)) { 3351 return false; 3352 } 3353 3354 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3355 uint dex_location_checksum = dex_file.GetLocationChecksum(); 3356 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 3357 &dex_location_checksum); 3358 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3359 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3360 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3361 if (oat_file_class_status == mirror::Class::kStatusVerified || 3362 oat_file_class_status == mirror::Class::kStatusInitialized) { 3363 return true; 3364 } 3365 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3366 // Compile time verification failed with a soft error. Compile time verification can fail 3367 // because we have incomplete type information. Consider the following: 3368 // class ... { 3369 // Foo x; 3370 // .... () { 3371 // if (...) { 3372 // v1 gets assigned a type of resolved class Foo 3373 // } else { 3374 // v1 gets assigned a type of unresolved class Bar 3375 // } 3376 // iput x = v1 3377 // } } 3378 // when we merge v1 following the if-the-else it results in Conflict 3379 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3380 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3381 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3382 // at compile time). 3383 return false; 3384 } 3385 if (oat_file_class_status == mirror::Class::kStatusError) { 3386 // Compile time verification failed with a hard error. This is caused by invalid instructions 3387 // in the class. These errors are unrecoverable. 3388 return false; 3389 } 3390 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3391 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3392 // not loading the class. 3393 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3394 // isn't a problem and this case shouldn't occur 3395 return false; 3396 } 3397 std::string temp; 3398 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3399 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3400 << klass->GetDescriptor(&temp); 3401 3402 return false; 3403} 3404 3405void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3406 Handle<mirror::Class> klass) { 3407 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3408 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3409 } 3410 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3411 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3412 } 3413} 3414 3415void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3416 mirror::ArtMethod* method) { 3417 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3418 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3419 if (code_item == NULL) { 3420 return; // native or abstract method 3421 } 3422 if (code_item->tries_size_ == 0) { 3423 return; // nothing to process 3424 } 3425 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3426 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3427 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3428 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3429 CatchHandlerIterator iterator(handlers_ptr); 3430 for (; iterator.HasNext(); iterator.Next()) { 3431 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3432 // unresolved exception types will be ignored by exception delivery 3433 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3434 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3435 if (exception_type == NULL) { 3436 DCHECK(Thread::Current()->IsExceptionPending()); 3437 Thread::Current()->ClearException(); 3438 } 3439 } 3440 } 3441 handlers_ptr = iterator.EndDataPointer(); 3442 } 3443} 3444 3445static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3446static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3447 Handle<mirror::ArtMethod> prototype); 3448 3449mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3450 jobjectArray interfaces, jobject loader, 3451 jobjectArray methods, jobjectArray throws) { 3452 Thread* self = soa.Self(); 3453 StackHandleScope<8> hs(self); 3454 Handle<mirror::Class> klass(hs.NewHandle( 3455 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3456 if (klass.Get() == NULL) { 3457 CHECK(self->IsExceptionPending()); // OOME. 3458 return NULL; 3459 } 3460 DCHECK(klass->GetClass() != NULL); 3461 klass->SetObjectSize(sizeof(mirror::Proxy)); 3462 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 3463 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3464 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3465 klass->SetName(soa.Decode<mirror::String*>(name)); 3466 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3467 klass->SetDexCache(proxy_class->GetDexCache()); 3468 klass->SetStatus(mirror::Class::kStatusIdx, self); 3469 3470 // Instance fields are inherited, but we add a couple of static fields... 3471 { 3472 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3473 if (UNLIKELY(sfields == NULL)) { 3474 CHECK(self->IsExceptionPending()); // OOME. 3475 return NULL; 3476 } 3477 klass->SetSFields(sfields); 3478 } 3479 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3480 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3481 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3482 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3483 CHECK(self->IsExceptionPending()); // OOME. 3484 return nullptr; 3485 } 3486 klass->SetStaticField(0, interfaces_sfield.Get()); 3487 interfaces_sfield->SetDexFieldIndex(0); 3488 interfaces_sfield->SetDeclaringClass(klass.Get()); 3489 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3490 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3491 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3492 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3493 CHECK(self->IsExceptionPending()); // OOME. 3494 return nullptr; 3495 } 3496 klass->SetStaticField(1, throws_sfield.Get()); 3497 throws_sfield->SetDexFieldIndex(1); 3498 throws_sfield->SetDeclaringClass(klass.Get()); 3499 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3500 3501 // Proxies have 1 direct method, the constructor 3502 { 3503 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3504 if (UNLIKELY(directs == nullptr)) { 3505 CHECK(self->IsExceptionPending()); // OOME. 3506 return nullptr; 3507 } 3508 klass->SetDirectMethods(directs); 3509 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3510 if (UNLIKELY(constructor == nullptr)) { 3511 CHECK(self->IsExceptionPending()); // OOME. 3512 return nullptr; 3513 } 3514 klass->SetDirectMethod(0, constructor); 3515 } 3516 3517 // Create virtual method using specified prototypes. 3518 size_t num_virtual_methods = 3519 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3520 { 3521 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3522 num_virtual_methods); 3523 if (UNLIKELY(virtuals == NULL)) { 3524 CHECK(self->IsExceptionPending()); // OOME. 3525 return NULL; 3526 } 3527 klass->SetVirtualMethods(virtuals); 3528 } 3529 for (size_t i = 0; i < num_virtual_methods; ++i) { 3530 StackHandleScope<1> hs(self); 3531 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3532 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3533 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3534 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3535 if (UNLIKELY(clone == nullptr)) { 3536 CHECK(self->IsExceptionPending()); // OOME. 3537 return nullptr; 3538 } 3539 klass->SetVirtualMethod(i, clone); 3540 } 3541 3542 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3543 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3544 self->AssertNoPendingException(); 3545 3546 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3547 mirror::Class* new_class = nullptr; 3548 { 3549 ObjectLock<mirror::Class> resolution_lock(self, klass); // Must hold lock on object when resolved. 3550 // Link the fields and virtual methods, creating vtable and iftables 3551 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3552 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3553 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3554 klass->SetStatus(mirror::Class::kStatusError, self); 3555 return nullptr; 3556 } 3557 } 3558 3559 CHECK(klass->IsRetired()); 3560 CHECK_NE(klass.Get(), new_class); 3561 klass.Assign(new_class); 3562 3563 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3564 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3565 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3566 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3567 3568 { 3569 // Lock on klass is released. Lock new class object. 3570 ObjectLock<mirror::Class> initialization_lock(self, klass); 3571 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3572 } 3573 3574 // sanity checks 3575 if (kIsDebugBuild) { 3576 CHECK(klass->GetIFields() == nullptr); 3577 CheckProxyConstructor(klass->GetDirectMethod(0)); 3578 for (size_t i = 0; i < num_virtual_methods; ++i) { 3579 StackHandleScope<2> hs(self); 3580 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3581 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3582 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3583 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3584 CheckProxyMethod(virtual_method, prototype); 3585 } 3586 3587 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3588 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3589 decoded_name->ToModifiedUtf8().c_str())); 3590 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3591 3592 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3593 decoded_name->ToModifiedUtf8().c_str())); 3594 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3595 3596 CHECK_EQ(klass.Get()->GetInterfaces(), 3597 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3598 CHECK_EQ(klass.Get()->GetThrows(), 3599 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3600 } 3601 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3602 CHECK(existing == nullptr); 3603 return klass.Get(); 3604} 3605 3606std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3607 DCHECK(proxy_class->IsProxyClass()); 3608 mirror::String* name = proxy_class->GetName(); 3609 DCHECK(name != NULL); 3610 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3611} 3612 3613mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3614 mirror::ArtMethod* proxy_method) { 3615 DCHECK(proxy_class->IsProxyClass()); 3616 DCHECK(proxy_method->IsProxyMethod()); 3617 // Locate the dex cache of the original interface/Object 3618 mirror::DexCache* dex_cache = nullptr; 3619 { 3620 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3621 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3622 mirror::DexCache* a_dex_cache = GetDexCache(i); 3623 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3624 dex_cache = a_dex_cache; 3625 break; 3626 } 3627 } 3628 } 3629 CHECK(dex_cache != nullptr); 3630 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3631 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3632 CHECK(resolved_method != nullptr); 3633 return resolved_method; 3634} 3635 3636 3637mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3638 Handle<mirror::Class> klass, 3639 mirror::Class* proxy_class) { 3640 // Create constructor for Proxy that must initialize h 3641 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3642 proxy_class->GetDirectMethods(); 3643 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3644 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3645 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3646 // code_ too) 3647 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3648 if (constructor == nullptr) { 3649 CHECK(self->IsExceptionPending()); // OOME. 3650 return nullptr; 3651 } 3652 // Make this constructor public and fix the class to be our Proxy version 3653 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3654 constructor->SetDeclaringClass(klass.Get()); 3655 return constructor; 3656} 3657 3658static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3659 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3660 CHECK(constructor->IsConstructor()); 3661 CHECK_STREQ(constructor->GetName(), "<init>"); 3662 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3663 "(Ljava/lang/reflect/InvocationHandler;)V"); 3664 DCHECK(constructor->IsPublic()); 3665} 3666 3667mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3668 Handle<mirror::Class> klass, 3669 Handle<mirror::ArtMethod> prototype) { 3670 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3671 // prototype method 3672 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3673 prototype.Get()); 3674 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3675 // as necessary 3676 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3677 if (UNLIKELY(method == NULL)) { 3678 CHECK(self->IsExceptionPending()); // OOME. 3679 return NULL; 3680 } 3681 3682 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3683 // the intersection of throw exceptions as defined in Proxy 3684 method->SetDeclaringClass(klass.Get()); 3685 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3686 3687 // At runtime the method looks like a reference and argument saving method, clone the code 3688 // related parameters from this method. 3689 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3690 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3691 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3692 3693 return method; 3694} 3695 3696static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3697 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3698 // Basic sanity 3699 CHECK(!prototype->IsFinal()); 3700 CHECK(method->IsFinal()); 3701 CHECK(!method->IsAbstract()); 3702 3703 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3704 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3705 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3706 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 3707 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 3708 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3709 3710 MethodHelper mh(method); 3711 MethodHelper mh2(prototype); 3712 CHECK_STREQ(method->GetName(), prototype->GetName()); 3713 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3714 // More complex sanity - via dex cache 3715 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3716} 3717 3718static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3719 bool can_init_parents) 3720 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3721 if (can_init_statics && can_init_parents) { 3722 return true; 3723 } 3724 if (!can_init_statics) { 3725 // Check if there's a class initializer. 3726 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3727 if (clinit != NULL) { 3728 return false; 3729 } 3730 // Check if there are encoded static values needing initialization. 3731 if (klass->NumStaticFields() != 0) { 3732 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3733 DCHECK(dex_class_def != NULL); 3734 if (dex_class_def->static_values_off_ != 0) { 3735 return false; 3736 } 3737 } 3738 } 3739 if (!klass->IsInterface() && klass->HasSuperClass()) { 3740 mirror::Class* super_class = klass->GetSuperClass(); 3741 if (!can_init_parents && !super_class->IsInitialized()) { 3742 return false; 3743 } else { 3744 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3745 return false; 3746 } 3747 } 3748 } 3749 return true; 3750} 3751 3752bool ClassLinker::IsInitialized() const { 3753 return init_done_; 3754} 3755 3756bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3757 bool can_init_parents) { 3758 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3759 3760 // Are we already initialized and therefore done? 3761 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3762 // an initialized class will never change its state. 3763 if (klass->IsInitialized()) { 3764 return true; 3765 } 3766 3767 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3768 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3769 return false; 3770 } 3771 3772 Thread* self = Thread::Current(); 3773 uint64_t t0; 3774 { 3775 ObjectLock<mirror::Class> lock(self, klass); 3776 3777 // Re-check under the lock in case another thread initialized ahead of us. 3778 if (klass->IsInitialized()) { 3779 return true; 3780 } 3781 3782 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3783 if (klass->IsErroneous()) { 3784 ThrowEarlierClassFailure(klass.Get()); 3785 return false; 3786 } 3787 3788 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3789 3790 if (!klass->IsVerified()) { 3791 VerifyClass(klass); 3792 if (!klass->IsVerified()) { 3793 // We failed to verify, expect either the klass to be erroneous or verification failed at 3794 // compile time. 3795 if (klass->IsErroneous()) { 3796 CHECK(self->IsExceptionPending()); 3797 } else { 3798 CHECK(Runtime::Current()->IsCompiler()); 3799 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3800 } 3801 return false; 3802 } 3803 } 3804 3805 // If the class is kStatusInitializing, either this thread is 3806 // initializing higher up the stack or another thread has beat us 3807 // to initializing and we need to wait. Either way, this 3808 // invocation of InitializeClass will not be responsible for 3809 // running <clinit> and will return. 3810 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3811 // We caught somebody else in the act; was it us? 3812 if (klass->GetClinitThreadId() == self->GetTid()) { 3813 // Yes. That's fine. Return so we can continue initializing. 3814 return true; 3815 } 3816 // No. That's fine. Wait for another thread to finish initializing. 3817 return WaitForInitializeClass(klass, self, lock); 3818 } 3819 3820 if (!ValidateSuperClassDescriptors(klass)) { 3821 klass->SetStatus(mirror::Class::kStatusError, self); 3822 return false; 3823 } 3824 3825 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3826 3827 // From here out other threads may observe that we're initializing and so changes of state 3828 // require the a notification. 3829 klass->SetClinitThreadId(self->GetTid()); 3830 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3831 3832 t0 = NanoTime(); 3833 } 3834 3835 // Initialize super classes, must be done while initializing for the JLS. 3836 if (!klass->IsInterface() && klass->HasSuperClass()) { 3837 mirror::Class* super_class = klass->GetSuperClass(); 3838 if (!super_class->IsInitialized()) { 3839 CHECK(!super_class->IsInterface()); 3840 CHECK(can_init_parents); 3841 StackHandleScope<1> hs(self); 3842 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3843 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3844 if (!super_initialized) { 3845 // The super class was verified ahead of entering initializing, we should only be here if 3846 // the super class became erroneous due to initialization. 3847 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3848 << "Super class initialization failed for " 3849 << PrettyDescriptor(handle_scope_super.Get()) 3850 << " that has unexpected status " << handle_scope_super->GetStatus() 3851 << "\nPending exception:\n" 3852 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3853 ObjectLock<mirror::Class> lock(self, klass); 3854 // Initialization failed because the super-class is erroneous. 3855 klass->SetStatus(mirror::Class::kStatusError, self); 3856 return false; 3857 } 3858 } 3859 } 3860 3861 if (klass->NumStaticFields() > 0) { 3862 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3863 CHECK(dex_class_def != NULL); 3864 const DexFile& dex_file = klass->GetDexFile(); 3865 StackHandleScope<2> hs(self); 3866 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3867 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3868 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3869 this, *dex_class_def); 3870 if (it.HasNext()) { 3871 CHECK(can_init_statics); 3872 // We reordered the fields, so we need to be able to map the 3873 // field indexes to the right fields. 3874 SafeMap<uint32_t, mirror::ArtField*> field_map; 3875 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3876 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3877 if (Runtime::Current()->IsActiveTransaction()) { 3878 it.ReadValueToField<true>(field_map.Get(i)); 3879 } else { 3880 it.ReadValueToField<false>(field_map.Get(i)); 3881 } 3882 } 3883 } 3884 } 3885 3886 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3887 if (clinit != NULL) { 3888 CHECK(can_init_statics); 3889 JValue result; 3890 clinit->Invoke(self, NULL, 0, &result, "V"); 3891 } 3892 3893 uint64_t t1 = NanoTime(); 3894 3895 bool success = true; 3896 { 3897 ObjectLock<mirror::Class> lock(self, klass); 3898 3899 if (self->IsExceptionPending()) { 3900 WrapExceptionInInitializer(); 3901 klass->SetStatus(mirror::Class::kStatusError, self); 3902 success = false; 3903 } else { 3904 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3905 RuntimeStats* thread_stats = self->GetStats(); 3906 ++global_stats->class_init_count; 3907 ++thread_stats->class_init_count; 3908 global_stats->class_init_time_ns += (t1 - t0); 3909 thread_stats->class_init_time_ns += (t1 - t0); 3910 // Set the class as initialized except if failed to initialize static fields. 3911 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3912 if (VLOG_IS_ON(class_linker)) { 3913 std::string temp; 3914 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 3915 klass->GetLocation(); 3916 } 3917 // Opportunistically set static method trampolines to their destination. 3918 FixupStaticTrampolines(klass.Get()); 3919 } 3920 } 3921 return success; 3922} 3923 3924bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3925 ObjectLock<mirror::Class>& lock) 3926 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3927 while (true) { 3928 self->AssertNoPendingException(); 3929 CHECK(!klass->IsInitialized()); 3930 lock.WaitIgnoringInterrupts(); 3931 3932 // When we wake up, repeat the test for init-in-progress. If 3933 // there's an exception pending (only possible if 3934 // "interruptShouldThrow" was set), bail out. 3935 if (self->IsExceptionPending()) { 3936 WrapExceptionInInitializer(); 3937 klass->SetStatus(mirror::Class::kStatusError, self); 3938 return false; 3939 } 3940 // Spurious wakeup? Go back to waiting. 3941 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3942 continue; 3943 } 3944 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3945 // Compile time initialization failed. 3946 return false; 3947 } 3948 if (klass->IsErroneous()) { 3949 // The caller wants an exception, but it was thrown in a 3950 // different thread. Synthesize one here. 3951 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3952 PrettyDescriptor(klass.Get()).c_str()); 3953 return false; 3954 } 3955 if (klass->IsInitialized()) { 3956 return true; 3957 } 3958 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 3959 << klass->GetStatus(); 3960 } 3961 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 3962} 3963 3964bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 3965 if (klass->IsInterface()) { 3966 return true; 3967 } 3968 // Begin with the methods local to the superclass. 3969 StackHandleScope<2> hs(Thread::Current()); 3970 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3971 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3972 if (klass->HasSuperClass() && 3973 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3974 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 3975 mh.ChangeMethod(klass->GetVTableEntry(i)); 3976 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 3977 if (mh.GetMethod() != super_mh.GetMethod() && 3978 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3979 ThrowLinkageError(klass.Get(), 3980 "Class %s method %s resolves differently in superclass %s", 3981 PrettyDescriptor(klass.Get()).c_str(), 3982 PrettyMethod(mh.GetMethod()).c_str(), 3983 PrettyDescriptor(klass->GetSuperClass()).c_str()); 3984 return false; 3985 } 3986 } 3987 } 3988 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3989 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 3990 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 3991 for (uint32_t j = 0; j < num_methods; ++j) { 3992 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 3993 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 3994 if (mh.GetMethod() != super_mh.GetMethod() && 3995 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3996 ThrowLinkageError(klass.Get(), 3997 "Class %s method %s resolves differently in interface %s", 3998 PrettyDescriptor(klass.Get()).c_str(), 3999 PrettyMethod(mh.GetMethod()).c_str(), 4000 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4001 return false; 4002 } 4003 } 4004 } 4005 } 4006 return true; 4007} 4008 4009bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 4010 bool can_init_parents) { 4011 DCHECK(c.Get() != nullptr); 4012 const bool success = c->IsInitialized() || InitializeClass(c, can_init_fields, can_init_parents); 4013 if (!success && can_init_fields && can_init_parents) { 4014 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.Get()); 4015 } 4016 return success; 4017} 4018 4019void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 4020 mirror::Class* c, 4021 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 4022 const byte* class_data = dex_file.GetClassData(dex_class_def); 4023 ClassDataItemIterator it(dex_file, class_data); 4024 StackHandleScope<2> hs(Thread::Current()); 4025 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 4026 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 4027 CHECK(!kMovingFields); 4028 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 4029 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 4030 } 4031} 4032 4033void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4034 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4035 if (fields != nullptr) { 4036 for (int index = 0; index < fields->GetLength(); index ++) { 4037 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4038 fields->Get(index)->SetDeclaringClass(new_class); 4039 } 4040 } 4041 } 4042 4043 fields = new_class->GetSFields(); 4044 if (fields != nullptr) { 4045 for (int index = 0; index < fields->GetLength(); index ++) { 4046 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4047 fields->Get(index)->SetDeclaringClass(new_class); 4048 } 4049 } 4050 } 4051 4052 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4053 if (methods != nullptr) { 4054 for (int index = 0; index < methods->GetLength(); index ++) { 4055 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4056 methods->Get(index)->SetDeclaringClass(new_class); 4057 } 4058 } 4059 } 4060 4061 methods = new_class->GetVirtualMethods(); 4062 if (methods != nullptr) { 4063 for (int index = 0; index < methods->GetLength(); index ++) { 4064 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4065 methods->Get(index)->SetDeclaringClass(new_class); 4066 } 4067 } 4068 } 4069} 4070 4071bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4072 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4073 mirror::Class** new_class) { 4074 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4075 4076 if (!LinkSuperClass(klass)) { 4077 return false; 4078 } 4079 if (!LinkMethods(self, klass, interfaces)) { 4080 return false; 4081 } 4082 if (!LinkInstanceFields(klass)) { 4083 return false; 4084 } 4085 size_t class_size; 4086 if (!LinkStaticFields(klass, &class_size)) { 4087 return false; 4088 } 4089 CreateReferenceInstanceOffsets(klass); 4090 CreateReferenceStaticOffsets(klass); 4091 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4092 4093 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4094 // We don't need to retire this class as it has no embedded tables or it was created the 4095 // correct size during class linker initialization. 4096 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4097 4098 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4099 klass->PopulateEmbeddedImtAndVTable(); 4100 } 4101 4102 // This will notify waiters on klass that saw the not yet resolved 4103 // class in the class_table_ during EnsureResolved. 4104 klass->SetStatus(mirror::Class::kStatusResolved, self); 4105 *new_class = klass.Get(); 4106 } else { 4107 CHECK(!klass->IsResolved()); 4108 // Retire the temporary class and create the correctly sized resolved class. 4109 *new_class = klass->CopyOf(self, class_size); 4110 if (UNLIKELY(*new_class == NULL)) { 4111 CHECK(self->IsExceptionPending()); // Expect an OOME. 4112 klass->SetStatus(mirror::Class::kStatusError, self); 4113 return false; 4114 } 4115 4116 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4117 StackHandleScope<1> hs(self); 4118 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4119 ObjectLock<mirror::Class> lock(self, new_class_h); 4120 4121 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4122 4123 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4124 CHECK(existing == NULL || existing == klass.Get()); 4125 4126 // This will notify waiters on temp class that saw the not yet resolved class in the 4127 // class_table_ during EnsureResolved. 4128 klass->SetStatus(mirror::Class::kStatusRetired, self); 4129 4130 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4131 // This will notify waiters on new_class that saw the not yet resolved 4132 // class in the class_table_ during EnsureResolved. 4133 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4134 } 4135 return true; 4136} 4137 4138bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4139 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4140 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4141 uint16_t super_class_idx = class_def.superclass_idx_; 4142 if (super_class_idx != DexFile::kDexNoIndex16) { 4143 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4144 if (super_class == NULL) { 4145 DCHECK(Thread::Current()->IsExceptionPending()); 4146 return false; 4147 } 4148 // Verify 4149 if (!klass->CanAccess(super_class)) { 4150 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4151 PrettyDescriptor(super_class).c_str(), 4152 PrettyDescriptor(klass.Get()).c_str()); 4153 return false; 4154 } 4155 CHECK(super_class->IsResolved()); 4156 klass->SetSuperClass(super_class); 4157 } 4158 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4159 if (interfaces != NULL) { 4160 for (size_t i = 0; i < interfaces->Size(); i++) { 4161 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4162 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4163 if (interface == NULL) { 4164 DCHECK(Thread::Current()->IsExceptionPending()); 4165 return false; 4166 } 4167 // Verify 4168 if (!klass->CanAccess(interface)) { 4169 // TODO: the RI seemed to ignore this in my testing. 4170 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4171 PrettyDescriptor(interface).c_str(), 4172 PrettyDescriptor(klass.Get()).c_str()); 4173 return false; 4174 } 4175 } 4176 } 4177 // Mark the class as loaded. 4178 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 4179 return true; 4180} 4181 4182bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4183 CHECK(!klass->IsPrimitive()); 4184 mirror::Class* super = klass->GetSuperClass(); 4185 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4186 if (super != NULL) { 4187 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4188 return false; 4189 } 4190 return true; 4191 } 4192 if (super == NULL) { 4193 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4194 PrettyDescriptor(klass.Get()).c_str()); 4195 return false; 4196 } 4197 // Verify 4198 if (super->IsFinal() || super->IsInterface()) { 4199 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4200 PrettyDescriptor(super).c_str(), 4201 PrettyDescriptor(klass.Get()).c_str(), 4202 super->IsFinal() ? "declared final" : "an interface"); 4203 return false; 4204 } 4205 if (!klass->CanAccess(super)) { 4206 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4207 PrettyDescriptor(super).c_str(), 4208 PrettyDescriptor(klass.Get()).c_str()); 4209 return false; 4210 } 4211 4212 // Inherit kAccClassIsFinalizable from the superclass in case this 4213 // class doesn't override finalize. 4214 if (super->IsFinalizable()) { 4215 klass->SetFinalizable(); 4216 } 4217 4218 // Inherit reference flags (if any) from the superclass. 4219 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4220 if (reference_flags != 0) { 4221 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4222 } 4223 // Disallow custom direct subclasses of java.lang.ref.Reference. 4224 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4225 ThrowLinkageError(klass.Get(), 4226 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4227 PrettyDescriptor(klass.Get()).c_str()); 4228 return false; 4229 } 4230 4231 if (kIsDebugBuild) { 4232 // Ensure super classes are fully resolved prior to resolving fields.. 4233 while (super != NULL) { 4234 CHECK(super->IsResolved()); 4235 super = super->GetSuperClass(); 4236 } 4237 } 4238 return true; 4239} 4240 4241// Populate the class vtable and itable. Compute return type indices. 4242bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4243 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4244 if (klass->IsInterface()) { 4245 // No vtable. 4246 size_t count = klass->NumVirtualMethods(); 4247 if (!IsUint(16, count)) { 4248 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4249 return false; 4250 } 4251 for (size_t i = 0; i < count; ++i) { 4252 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4253 } 4254 // Link interface method tables 4255 return LinkInterfaceMethods(klass, interfaces); 4256 } else { 4257 // Link virtual and interface method tables 4258 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4259 } 4260 return true; 4261} 4262 4263bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4264 if (klass->HasSuperClass()) { 4265 uint32_t max_count = klass->NumVirtualMethods() + 4266 klass->GetSuperClass()->GetVTableLength(); 4267 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4268 CHECK_LE(actual_count, max_count); 4269 StackHandleScope<4> hs(self); 4270 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4271 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4272 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4273 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4274 if (UNLIKELY(vtable.Get() == nullptr)) { 4275 CHECK(self->IsExceptionPending()); // OOME. 4276 return false; 4277 } 4278 int len = super_class->GetVTableLength(); 4279 for (int i = 0; i < len; i++) { 4280 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4281 } 4282 } else { 4283 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4284 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4285 if (UNLIKELY(vtable.Get() == nullptr)) { 4286 CHECK(self->IsExceptionPending()); // OOME. 4287 return false; 4288 } 4289 } 4290 4291 // See if any of our virtual methods override the superclass. 4292 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4293 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4294 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4295 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4296 local_mh.ChangeMethod(local_method); 4297 size_t j = 0; 4298 for (; j < actual_count; ++j) { 4299 mirror::ArtMethod* super_method = vtable->Get(j); 4300 super_mh.ChangeMethod(super_method); 4301 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4302 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4303 super_method->GetAccessFlags())) { 4304 if (super_method->IsFinal()) { 4305 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4306 PrettyMethod(local_method).c_str(), 4307 super_method->GetDeclaringClassDescriptor()); 4308 return false; 4309 } 4310 vtable->Set<false>(j, local_method); 4311 local_method->SetMethodIndex(j); 4312 break; 4313 } else { 4314 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4315 << " would have incorrectly overridden the package-private method in " 4316 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4317 } 4318 } 4319 } 4320 if (j == actual_count) { 4321 // Not overriding, append. 4322 vtable->Set<false>(actual_count, local_method); 4323 local_method->SetMethodIndex(actual_count); 4324 actual_count += 1; 4325 } 4326 } 4327 if (!IsUint(16, actual_count)) { 4328 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4329 return false; 4330 } 4331 // Shrink vtable if possible 4332 CHECK_LE(actual_count, max_count); 4333 if (actual_count < max_count) { 4334 vtable.Assign(vtable->CopyOf(self, actual_count)); 4335 if (UNLIKELY(vtable.Get() == NULL)) { 4336 CHECK(self->IsExceptionPending()); // OOME. 4337 return false; 4338 } 4339 } 4340 klass->SetVTable(vtable.Get()); 4341 } else { 4342 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4343 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4344 if (!IsUint(16, num_virtual_methods)) { 4345 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4346 return false; 4347 } 4348 StackHandleScope<1> hs(self); 4349 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4350 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4351 if (UNLIKELY(vtable.Get() == NULL)) { 4352 CHECK(self->IsExceptionPending()); // OOME. 4353 return false; 4354 } 4355 for (size_t i = 0; i < num_virtual_methods; ++i) { 4356 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4357 vtable->Set<false>(i, virtual_method); 4358 virtual_method->SetMethodIndex(i & 0xFFFF); 4359 } 4360 klass->SetVTable(vtable.Get()); 4361 } 4362 return true; 4363} 4364 4365bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 4366 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4367 Thread* const self = Thread::Current(); 4368 Runtime* const runtime = Runtime::Current(); 4369 // Set the imt table to be all conflicts by default. 4370 klass->SetImTable(runtime->GetDefaultImt()); 4371 size_t super_ifcount; 4372 if (klass->HasSuperClass()) { 4373 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4374 } else { 4375 super_ifcount = 0; 4376 } 4377 uint32_t num_interfaces = 4378 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4379 size_t ifcount = super_ifcount + num_interfaces; 4380 for (size_t i = 0; i < num_interfaces; i++) { 4381 mirror::Class* interface = 4382 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4383 interfaces->Get(i); 4384 ifcount += interface->GetIfTableCount(); 4385 } 4386 if (ifcount == 0) { 4387 // Class implements no interfaces. 4388 DCHECK_EQ(klass->GetIfTableCount(), 0); 4389 DCHECK(klass->GetIfTable() == NULL); 4390 return true; 4391 } 4392 if (ifcount == super_ifcount) { 4393 // Class implements same interfaces as parent, are any of these not marker interfaces? 4394 bool has_non_marker_interface = false; 4395 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4396 for (size_t i = 0; i < ifcount; ++i) { 4397 if (super_iftable->GetMethodArrayCount(i) > 0) { 4398 has_non_marker_interface = true; 4399 break; 4400 } 4401 } 4402 if (!has_non_marker_interface) { 4403 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4404 klass->SetIfTable(super_iftable); 4405 return true; 4406 } 4407 } 4408 StackHandleScope<4> hs(self); 4409 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4410 if (UNLIKELY(iftable.Get() == NULL)) { 4411 CHECK(self->IsExceptionPending()); // OOME. 4412 return false; 4413 } 4414 if (super_ifcount != 0) { 4415 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4416 for (size_t i = 0; i < super_ifcount; i++) { 4417 mirror::Class* super_interface = super_iftable->GetInterface(i); 4418 iftable->SetInterface(i, super_interface); 4419 } 4420 } 4421 // Flatten the interface inheritance hierarchy. 4422 size_t idx = super_ifcount; 4423 for (size_t i = 0; i < num_interfaces; i++) { 4424 mirror::Class* interface = 4425 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4426 interfaces->Get(i); 4427 DCHECK(interface != NULL); 4428 if (!interface->IsInterface()) { 4429 std::string temp; 4430 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4431 PrettyDescriptor(klass.Get()).c_str(), 4432 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4433 return false; 4434 } 4435 // Check if interface is already in iftable 4436 bool duplicate = false; 4437 for (size_t j = 0; j < idx; j++) { 4438 mirror::Class* existing_interface = iftable->GetInterface(j); 4439 if (existing_interface == interface) { 4440 duplicate = true; 4441 break; 4442 } 4443 } 4444 if (!duplicate) { 4445 // Add this non-duplicate interface. 4446 iftable->SetInterface(idx++, interface); 4447 // Add this interface's non-duplicate super-interfaces. 4448 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4449 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4450 bool super_duplicate = false; 4451 for (size_t k = 0; k < idx; k++) { 4452 mirror::Class* existing_interface = iftable->GetInterface(k); 4453 if (existing_interface == super_interface) { 4454 super_duplicate = true; 4455 break; 4456 } 4457 } 4458 if (!super_duplicate) { 4459 iftable->SetInterface(idx++, super_interface); 4460 } 4461 } 4462 } 4463 } 4464 // Shrink iftable in case duplicates were found 4465 if (idx < ifcount) { 4466 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4467 if (UNLIKELY(iftable.Get() == NULL)) { 4468 CHECK(self->IsExceptionPending()); // OOME. 4469 return false; 4470 } 4471 ifcount = idx; 4472 } else { 4473 CHECK_EQ(idx, ifcount); 4474 } 4475 klass->SetIfTable(iftable.Get()); 4476 4477 // If we're an interface, we don't need the vtable pointers, so we're done. 4478 if (klass->IsInterface()) { 4479 return true; 4480 } 4481 // Allocate imtable 4482 bool imtable_changed = false; 4483 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4484 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4485 if (UNLIKELY(imtable.Get() == NULL)) { 4486 CHECK(self->IsExceptionPending()); // OOME. 4487 return false; 4488 } 4489 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4490 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4491 std::vector<mirror::ArtMethod*> miranda_list; 4492 for (size_t i = 0; i < ifcount; ++i) { 4493 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4494 if (num_methods > 0) { 4495 StackHandleScope<2> hs(self); 4496 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4497 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4498 if (UNLIKELY(method_array.Get() == nullptr)) { 4499 CHECK(self->IsExceptionPending()); // OOME. 4500 return false; 4501 } 4502 iftable->SetMethodArray(i, method_array.Get()); 4503 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4504 hs.NewHandle(klass->GetVTableDuringLinking())); 4505 for (size_t j = 0; j < num_methods; ++j) { 4506 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 4507 interface_mh.ChangeMethod(interface_method); 4508 int32_t k; 4509 // For each method listed in the interface's method list, find the 4510 // matching method in our class's method list. We want to favor the 4511 // subclass over the superclass, which just requires walking 4512 // back from the end of the vtable. (This only matters if the 4513 // superclass defines a private method and this class redefines 4514 // it -- otherwise it would use the same vtable slot. In .dex files 4515 // those don't end up in the virtual method table, so it shouldn't 4516 // matter which direction we go. We walk it backward anyway.) 4517 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4518 mirror::ArtMethod* vtable_method = vtable->Get(k); 4519 vtable_mh.ChangeMethod(vtable_method); 4520 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4521 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 4522 ThrowIllegalAccessError( 4523 klass.Get(), 4524 "Method '%s' implementing interface method '%s' is not public", 4525 PrettyMethod(vtable_method).c_str(), 4526 PrettyMethod(interface_method).c_str()); 4527 return false; 4528 } 4529 method_array->Set<false>(j, vtable_method); 4530 // Place method in imt if entry is empty, place conflict otherwise. 4531 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4532 if (imtable->Get(imt_index) == NULL) { 4533 imtable->Set<false>(imt_index, vtable_method); 4534 imtable_changed = true; 4535 } else { 4536 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4537 } 4538 break; 4539 } 4540 } 4541 if (k < 0) { 4542 StackHandleScope<1> hs(self); 4543 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4544 for (mirror::ArtMethod* mir_method : miranda_list) { 4545 vtable_mh.ChangeMethod(mir_method); 4546 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4547 miranda_method.Assign(mir_method); 4548 break; 4549 } 4550 } 4551 if (miranda_method.Get() == NULL) { 4552 // Point the interface table at a phantom slot. 4553 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 4554 if (UNLIKELY(miranda_method.Get() == NULL)) { 4555 CHECK(self->IsExceptionPending()); // OOME. 4556 return false; 4557 } 4558 // TODO: If a methods move then the miranda_list may hold stale references. 4559 miranda_list.push_back(miranda_method.Get()); 4560 } 4561 method_array->Set<false>(j, miranda_method.Get()); 4562 } 4563 } 4564 } 4565 } 4566 if (imtable_changed) { 4567 // Fill in empty entries in interface method table with conflict. 4568 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4569 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4570 if (imtable->Get(i) == NULL) { 4571 imtable->Set<false>(i, imt_conflict_method); 4572 } 4573 } 4574 klass->SetImTable(imtable.Get()); 4575 } 4576 if (!miranda_list.empty()) { 4577 int old_method_count = klass->NumVirtualMethods(); 4578 int new_method_count = old_method_count + miranda_list.size(); 4579 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4580 if (old_method_count == 0) { 4581 virtuals = AllocArtMethodArray(self, new_method_count); 4582 } else { 4583 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4584 } 4585 if (UNLIKELY(virtuals == NULL)) { 4586 CHECK(self->IsExceptionPending()); // OOME. 4587 return false; 4588 } 4589 klass->SetVirtualMethods(virtuals); 4590 4591 StackHandleScope<1> hs(self); 4592 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4593 hs.NewHandle(klass->GetVTableDuringLinking())); 4594 CHECK(vtable.Get() != NULL); 4595 int old_vtable_count = vtable->GetLength(); 4596 int new_vtable_count = old_vtable_count + miranda_list.size(); 4597 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4598 if (UNLIKELY(vtable.Get() == NULL)) { 4599 CHECK(self->IsExceptionPending()); // OOME. 4600 return false; 4601 } 4602 for (size_t i = 0; i < miranda_list.size(); ++i) { 4603 mirror::ArtMethod* method = miranda_list[i]; 4604 // Leave the declaring class alone as type indices are relative to it 4605 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4606 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4607 klass->SetVirtualMethod(old_method_count + i, method); 4608 vtable->Set<false>(old_vtable_count + i, method); 4609 } 4610 // TODO: do not assign to the vtable field until it is fully constructed. 4611 klass->SetVTable(vtable.Get()); 4612 } 4613 4614 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4615 for (int i = 0; i < vtable->GetLength(); ++i) { 4616 CHECK(vtable->Get(i) != NULL); 4617 } 4618 4619// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4620 4621 return true; 4622} 4623 4624bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4625 CHECK(klass.Get() != NULL); 4626 return LinkFields(klass, false, nullptr); 4627} 4628 4629bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass, size_t* class_size) { 4630 CHECK(klass.Get() != NULL); 4631 return LinkFields(klass, true, class_size); 4632} 4633 4634struct LinkFieldsComparator { 4635 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4636 } 4637 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4638 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4639 NO_THREAD_SAFETY_ANALYSIS { 4640 // First come reference fields, then 64-bit, and finally 32-bit 4641 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4642 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4643 if (type1 != type2) { 4644 bool is_primitive1 = type1 != Primitive::kPrimNot; 4645 bool is_primitive2 = type2 != Primitive::kPrimNot; 4646 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4647 type1 == Primitive::kPrimDouble); 4648 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4649 type2 == Primitive::kPrimDouble); 4650 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4651 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4652 if (order1 != order2) { 4653 return order1 < order2; 4654 } 4655 } 4656 // same basic group? then sort by string. 4657 return strcmp(field1->GetName(), field2->GetName()) < 0; 4658 } 4659}; 4660 4661bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static, size_t* class_size) { 4662 size_t num_fields = 4663 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4664 4665 mirror::ObjectArray<mirror::ArtField>* fields = 4666 is_static ? klass->GetSFields() : klass->GetIFields(); 4667 4668 // Initialize field_offset 4669 MemberOffset field_offset(0); 4670 if (is_static) { 4671 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 4672 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4673 // Static fields come after the embedded tables. 4674 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 4675 0, 0, 0); 4676 } 4677 field_offset = MemberOffset(base); 4678 } else { 4679 mirror::Class* super_class = klass->GetSuperClass(); 4680 if (super_class != NULL) { 4681 CHECK(super_class->IsResolved()) 4682 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4683 field_offset = MemberOffset(super_class->GetObjectSize()); 4684 } 4685 } 4686 4687 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4688 4689 // we want a relatively stable order so that adding new fields 4690 // minimizes disruption of C++ version such as Class and Method. 4691 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4692 for (size_t i = 0; i < num_fields; i++) { 4693 mirror::ArtField* f = fields->Get(i); 4694 CHECK(f != NULL) << PrettyClass(klass.Get()); 4695 grouped_and_sorted_fields.push_back(f); 4696 } 4697 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4698 LinkFieldsComparator()); 4699 4700 // References should be at the front. 4701 size_t current_field = 0; 4702 size_t num_reference_fields = 0; 4703 for (; current_field < num_fields; current_field++) { 4704 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4705 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4706 bool isPrimitive = type != Primitive::kPrimNot; 4707 if (isPrimitive) { 4708 break; // past last reference, move on to the next phase 4709 } 4710 grouped_and_sorted_fields.pop_front(); 4711 num_reference_fields++; 4712 fields->Set<false>(current_field, field); 4713 field->SetOffset(field_offset); 4714 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4715 } 4716 4717 // Now we want to pack all of the double-wide fields together. If 4718 // we're not aligned, though, we want to shuffle one 32-bit field 4719 // into place. If we can't find one, we'll have to pad it. 4720 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4721 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4722 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4723 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4724 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4725 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4726 continue; 4727 } 4728 fields->Set<false>(current_field++, field); 4729 field->SetOffset(field_offset); 4730 // drop the consumed field 4731 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4732 break; 4733 } 4734 // whether we found a 32-bit field for padding or not, we advance 4735 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4736 } 4737 4738 // Alignment is good, shuffle any double-wide fields forward, and 4739 // finish assigning field offsets to all fields. 4740 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 4741 << PrettyClass(klass.Get()); 4742 while (!grouped_and_sorted_fields.empty()) { 4743 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4744 grouped_and_sorted_fields.pop_front(); 4745 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4746 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4747 fields->Set<false>(current_field, field); 4748 field->SetOffset(field_offset); 4749 field_offset = MemberOffset(field_offset.Uint32Value() + 4750 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4751 ? sizeof(uint64_t) 4752 : sizeof(uint32_t))); 4753 current_field++; 4754 } 4755 4756 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4757 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4758 // We know there are no non-reference fields in the Reference classes, and we know 4759 // that 'referent' is alphabetically last, so this is easy... 4760 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4761 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4762 --num_reference_fields; 4763 } 4764 4765 if (kIsDebugBuild) { 4766 // Make sure that all reference fields appear before 4767 // non-reference fields, and all double-wide fields are aligned. 4768 bool seen_non_ref = false; 4769 for (size_t i = 0; i < num_fields; i++) { 4770 mirror::ArtField* field = fields->Get(i); 4771 if (false) { // enable to debug field layout 4772 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4773 << " class=" << PrettyClass(klass.Get()) 4774 << " field=" << PrettyField(field) 4775 << " offset=" 4776 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4777 } 4778 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4779 bool is_primitive = type != Primitive::kPrimNot; 4780 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4781 strcmp("referent", field->GetName()) == 0) { 4782 is_primitive = true; // We lied above, so we have to expect a lie here. 4783 } 4784 if (is_primitive) { 4785 if (!seen_non_ref) { 4786 seen_non_ref = true; 4787 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4788 } 4789 } else { 4790 DCHECK(!seen_non_ref) << PrettyField(field); 4791 } 4792 } 4793 if (!seen_non_ref) { 4794 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4795 } 4796 } 4797 4798 size_t size = field_offset.Uint32Value(); 4799 // Update klass 4800 if (is_static) { 4801 klass->SetNumReferenceStaticFields(num_reference_fields); 4802 *class_size = size; 4803 } else { 4804 klass->SetNumReferenceInstanceFields(num_reference_fields); 4805 if (!klass->IsVariableSize()) { 4806 std::string temp; 4807 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 4808 size_t previous_size = klass->GetObjectSize(); 4809 if (previous_size != 0) { 4810 // Make sure that we didn't originally have an incorrect size. 4811 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 4812 } 4813 klass->SetObjectSize(size); 4814 } 4815 } 4816 return true; 4817} 4818 4819// Set the bitmap of reference offsets, refOffsets, from the ifields 4820// list. 4821void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4822 uint32_t reference_offsets = 0; 4823 mirror::Class* super_class = klass->GetSuperClass(); 4824 if (super_class != NULL) { 4825 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4826 // If our superclass overflowed, we don't stand a chance. 4827 if (reference_offsets == CLASS_WALK_SUPER) { 4828 klass->SetReferenceInstanceOffsets(reference_offsets); 4829 return; 4830 } 4831 } 4832 CreateReferenceOffsets(klass, false, reference_offsets); 4833} 4834 4835void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4836 CreateReferenceOffsets(klass, true, 0); 4837} 4838 4839void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4840 uint32_t reference_offsets) { 4841 size_t num_reference_fields = 4842 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4843 : klass->NumReferenceInstanceFieldsDuringLinking(); 4844 mirror::ObjectArray<mirror::ArtField>* fields = 4845 is_static ? klass->GetSFields() : klass->GetIFields(); 4846 // All of the fields that contain object references are guaranteed 4847 // to be at the beginning of the fields list. 4848 for (size_t i = 0; i < num_reference_fields; ++i) { 4849 // Note that byte_offset is the offset from the beginning of 4850 // object, not the offset into instance data 4851 mirror::ArtField* field = fields->Get(i); 4852 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4853 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4854 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4855 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4856 CHECK_NE(new_bit, 0U); 4857 reference_offsets |= new_bit; 4858 } else { 4859 reference_offsets = CLASS_WALK_SUPER; 4860 break; 4861 } 4862 } 4863 // Update fields in klass 4864 if (is_static) { 4865 klass->SetReferenceStaticOffsets(reference_offsets); 4866 } else { 4867 klass->SetReferenceInstanceOffsets(reference_offsets); 4868 } 4869} 4870 4871mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4872 Handle<mirror::DexCache> dex_cache) { 4873 DCHECK(dex_cache.Get() != nullptr); 4874 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4875 if (resolved != NULL) { 4876 return resolved; 4877 } 4878 uint32_t utf16_length; 4879 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4880 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4881 dex_cache->SetResolvedString(string_idx, string); 4882 return string; 4883} 4884 4885mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4886 mirror::Class* referrer) { 4887 StackHandleScope<2> hs(Thread::Current()); 4888 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4889 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4890 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4891} 4892 4893mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4894 Handle<mirror::DexCache> dex_cache, 4895 Handle<mirror::ClassLoader> class_loader) { 4896 DCHECK(dex_cache.Get() != NULL); 4897 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4898 if (resolved == NULL) { 4899 Thread* self = Thread::Current(); 4900 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4901 resolved = FindClass(self, descriptor, class_loader); 4902 if (resolved != NULL) { 4903 // TODO: we used to throw here if resolved's class loader was not the 4904 // boot class loader. This was to permit different classes with the 4905 // same name to be loaded simultaneously by different loaders 4906 dex_cache->SetResolvedType(type_idx, resolved); 4907 } else { 4908 CHECK(self->IsExceptionPending()) 4909 << "Expected pending exception for failed resolution of: " << descriptor; 4910 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4911 StackHandleScope<1> hs(self); 4912 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4913 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4914 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4915 self->ClearException(); 4916 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4917 self->GetException(NULL)->SetCause(cause.Get()); 4918 } 4919 } 4920 } 4921 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4922 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4923 return resolved; 4924} 4925 4926mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 4927 Handle<mirror::DexCache> dex_cache, 4928 Handle<mirror::ClassLoader> class_loader, 4929 Handle<mirror::ArtMethod> referrer, 4930 InvokeType type) { 4931 DCHECK(dex_cache.Get() != nullptr); 4932 // Check for hit in the dex cache. 4933 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4934 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 4935 return resolved; 4936 } 4937 // Fail, get the declaring class. 4938 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4939 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4940 if (klass == nullptr) { 4941 DCHECK(Thread::Current()->IsExceptionPending()); 4942 return nullptr; 4943 } 4944 // Scan using method_idx, this saves string compares but will only hit for matching dex 4945 // caches/files. 4946 switch (type) { 4947 case kDirect: // Fall-through. 4948 case kStatic: 4949 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 4950 break; 4951 case kInterface: 4952 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 4953 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 4954 break; 4955 case kSuper: // Fall-through. 4956 case kVirtual: 4957 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 4958 break; 4959 default: 4960 LOG(FATAL) << "Unreachable - invocation type: " << type; 4961 } 4962 if (resolved == nullptr) { 4963 // Search by name, which works across dex files. 4964 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4965 const Signature signature = dex_file.GetMethodSignature(method_id); 4966 switch (type) { 4967 case kDirect: // Fall-through. 4968 case kStatic: 4969 resolved = klass->FindDirectMethod(name, signature); 4970 break; 4971 case kInterface: 4972 resolved = klass->FindInterfaceMethod(name, signature); 4973 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 4974 break; 4975 case kSuper: // Fall-through. 4976 case kVirtual: 4977 resolved = klass->FindVirtualMethod(name, signature); 4978 break; 4979 } 4980 } 4981 // If we found a method, check for incompatible class changes. 4982 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 4983 // Be a good citizen and update the dex cache to speed subsequent calls. 4984 dex_cache->SetResolvedMethod(method_idx, resolved); 4985 return resolved; 4986 } else { 4987 // If we had a method, it's an incompatible-class-change error. 4988 if (resolved != nullptr) { 4989 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 4990 } else { 4991 // We failed to find the method which means either an access error, an incompatible class 4992 // change, or no such method. First try to find the method among direct and virtual methods. 4993 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4994 const Signature signature = dex_file.GetMethodSignature(method_id); 4995 switch (type) { 4996 case kDirect: 4997 case kStatic: 4998 resolved = klass->FindVirtualMethod(name, signature); 4999 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5000 // have had a resolved method before, which triggers the "true" branch above. 5001 break; 5002 case kInterface: 5003 case kVirtual: 5004 case kSuper: 5005 resolved = klass->FindDirectMethod(name, signature); 5006 break; 5007 } 5008 5009 // If we found something, check that it can be accessed by the referrer. 5010 if (resolved != nullptr && referrer.Get() != nullptr) { 5011 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5012 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5013 if (!referring_class->CanAccess(methods_class)) { 5014 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5015 resolved, type); 5016 return nullptr; 5017 } else if (!referring_class->CanAccessMember(methods_class, 5018 resolved->GetAccessFlags())) { 5019 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5020 return nullptr; 5021 } 5022 } 5023 5024 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 5025 // methods and throw if we find the method there. If we find nothing, throw a 5026 // NoSuchMethodError. 5027 switch (type) { 5028 case kDirect: 5029 case kStatic: 5030 if (resolved != nullptr) { 5031 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5032 } else { 5033 resolved = klass->FindInterfaceMethod(name, signature); 5034 if (resolved != nullptr) { 5035 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5036 } else { 5037 ThrowNoSuchMethodError(type, klass, name, signature); 5038 } 5039 } 5040 break; 5041 case kInterface: 5042 if (resolved != nullptr) { 5043 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5044 } else { 5045 resolved = klass->FindVirtualMethod(name, signature); 5046 if (resolved != nullptr) { 5047 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5048 } else { 5049 ThrowNoSuchMethodError(type, klass, name, signature); 5050 } 5051 } 5052 break; 5053 case kSuper: 5054 if (resolved != nullptr) { 5055 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5056 } else { 5057 ThrowNoSuchMethodError(type, klass, name, signature); 5058 } 5059 break; 5060 case kVirtual: 5061 if (resolved != nullptr) { 5062 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5063 } else { 5064 resolved = klass->FindInterfaceMethod(name, signature); 5065 if (resolved != nullptr) { 5066 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5067 } else { 5068 ThrowNoSuchMethodError(type, klass, name, signature); 5069 } 5070 } 5071 break; 5072 } 5073 } 5074 DCHECK(Thread::Current()->IsExceptionPending()); 5075 return nullptr; 5076 } 5077} 5078 5079mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5080 Handle<mirror::DexCache> dex_cache, 5081 Handle<mirror::ClassLoader> class_loader, 5082 bool is_static) { 5083 DCHECK(dex_cache.Get() != nullptr); 5084 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5085 if (resolved != nullptr) { 5086 return resolved; 5087 } 5088 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5089 Thread* const self = Thread::Current(); 5090 StackHandleScope<1> hs(self); 5091 Handle<mirror::Class> klass( 5092 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5093 if (klass.Get() == nullptr) { 5094 DCHECK(Thread::Current()->IsExceptionPending()); 5095 return nullptr; 5096 } 5097 5098 if (is_static) { 5099 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5100 } else { 5101 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5102 } 5103 5104 if (resolved == nullptr) { 5105 const char* name = dex_file.GetFieldName(field_id); 5106 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5107 if (is_static) { 5108 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5109 } else { 5110 resolved = klass->FindInstanceField(name, type); 5111 } 5112 if (resolved == nullptr) { 5113 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5114 return NULL; 5115 } 5116 } 5117 dex_cache->SetResolvedField(field_idx, resolved); 5118 return resolved; 5119} 5120 5121mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5122 uint32_t field_idx, 5123 Handle<mirror::DexCache> dex_cache, 5124 Handle<mirror::ClassLoader> class_loader) { 5125 DCHECK(dex_cache.Get() != nullptr); 5126 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5127 if (resolved != nullptr) { 5128 return resolved; 5129 } 5130 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5131 Thread* self = Thread::Current(); 5132 StackHandleScope<1> hs(self); 5133 Handle<mirror::Class> klass( 5134 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5135 if (klass.Get() == NULL) { 5136 DCHECK(Thread::Current()->IsExceptionPending()); 5137 return NULL; 5138 } 5139 5140 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5141 StringPiece type(dex_file.StringDataByIdx( 5142 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5143 resolved = mirror::Class::FindField(self, klass, name, type); 5144 if (resolved != NULL) { 5145 dex_cache->SetResolvedField(field_idx, resolved); 5146 } else { 5147 ThrowNoSuchFieldError("", klass.Get(), type, name); 5148 } 5149 return resolved; 5150} 5151 5152const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5153 uint32_t* length) { 5154 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5155 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5156 const DexFile& dex_file = *dex_cache->GetDexFile(); 5157 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5158 return dex_file.GetMethodShorty(method_id, length); 5159} 5160 5161void ClassLinker::DumpAllClasses(int flags) { 5162 if (dex_cache_image_class_lookup_required_) { 5163 MoveImageClassesToClassTable(); 5164 } 5165 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5166 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5167 std::vector<mirror::Class*> all_classes; 5168 { 5169 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5170 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5171 mirror::Class* klass = it.second.Read(); 5172 all_classes.push_back(klass); 5173 } 5174 } 5175 5176 for (size_t i = 0; i < all_classes.size(); ++i) { 5177 all_classes[i]->DumpClass(std::cerr, flags); 5178 } 5179} 5180 5181void ClassLinker::DumpForSigQuit(std::ostream& os) { 5182 if (dex_cache_image_class_lookup_required_) { 5183 MoveImageClassesToClassTable(); 5184 } 5185 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5186 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5187} 5188 5189size_t ClassLinker::NumLoadedClasses() { 5190 if (dex_cache_image_class_lookup_required_) { 5191 MoveImageClassesToClassTable(); 5192 } 5193 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5194 return class_table_.size(); 5195} 5196 5197pid_t ClassLinker::GetClassesLockOwner() { 5198 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5199} 5200 5201pid_t ClassLinker::GetDexLockOwner() { 5202 return dex_lock_.GetExclusiveOwnerTid(); 5203} 5204 5205void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5206 DCHECK(!init_done_); 5207 5208 DCHECK(klass != NULL); 5209 DCHECK(klass->GetClassLoader() == NULL); 5210 5211 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5212 DCHECK(class_roots != NULL); 5213 DCHECK(class_roots->Get(class_root) == NULL); 5214 class_roots->Set<false>(class_root, klass); 5215} 5216 5217} // namespace art 5218