class_linker.cc revision 496cd337c19ca8386fec24633160f82c01993bbd
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 gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 951 if (image_space != nullptr) { 952 const ImageHeader& image_header = image_space->GetImageHeader(); 953 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 954 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 955 if (expected_image_oat_checksum != actual_image_oat_checksum) { 956 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 957 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 958 actual_image_oat_checksum); 959 return nullptr; 960 } 961 962 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 963 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 964 if (expected_image_oat_offset != actual_image_oat_offset) { 965 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 966 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 967 actual_image_oat_offset); 968 return nullptr; 969 } 970 int32_t expected_patch_delta = image_header.GetPatchDelta(); 971 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 972 if (expected_patch_delta != actual_patch_delta) { 973 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 974 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 975 return nullptr; 976 } 977 } 978 979 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 980 &dex_location_checksum); 981 if (oat_dex_file == nullptr) { 982 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 983 dex_location); 984 return nullptr; 985 } 986 uint32_t expected_dex_checksum = dex_location_checksum; 987 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 988 if (expected_dex_checksum != actual_dex_checksum) { 989 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 990 "found 0x%x", oat_location, expected_dex_checksum, 991 actual_dex_checksum); 992 return nullptr; 993 } 994 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 995 if (dex_file.get() != nullptr) { 996 return oat_file.release(); 997 } else { 998 return nullptr; 999 } 1000} 1001 1002const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1003 int fd, const char* oat_location, 1004 std::vector<std::string>* error_msgs) { 1005 // Generate the output oat file for the dex file 1006 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1007 std::string error_msg; 1008 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1009 CHECK(!error_msg.empty()); 1010 error_msgs->push_back(error_msg); 1011 return nullptr; 1012 } 1013 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 1014 !Runtime::Current()->IsCompiler(), 1015 &error_msg)); 1016 if (oat_file.get() == nullptr) { 1017 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1018 oat_location, error_msg.c_str()); 1019 error_msgs->push_back(compound_msg); 1020 return nullptr; 1021 } 1022 1023 return oat_file.release(); 1024} 1025 1026bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1027 const InstructionSet instruction_set) { 1028 Runtime* runtime = Runtime::Current(); 1029 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1030 if (image_space == nullptr) { 1031 return false; 1032 } 1033 uint32_t image_oat_checksum = 0; 1034 if (instruction_set == kRuntimeISA) { 1035 const ImageHeader& image_header = image_space->GetImageHeader(); 1036 image_oat_checksum = image_header.GetOatChecksum(); 1037 } else { 1038 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1039 image_space->GetImageLocation().c_str(), instruction_set)); 1040 image_oat_checksum = image_header->GetOatChecksum(); 1041 } 1042 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1043} 1044 1045bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1046 const InstructionSet instruction_set, 1047 std::string* error_msg) { 1048 Runtime* runtime = Runtime::Current(); 1049 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1050 if (image_space == nullptr) { 1051 *error_msg = "No image space for verification against"; 1052 return false; 1053 } 1054 1055 // If the requested instruction set is the same as the current runtime, 1056 // we can use the checksums directly. If it isn't, we'll have to read the 1057 // image header from the image for the right instruction set. 1058 uint32_t image_oat_checksum = 0; 1059 uintptr_t image_oat_data_begin = 0; 1060 int32_t image_patch_delta = 0; 1061 if (instruction_set == Runtime::Current()->GetInstructionSet()) { 1062 const ImageHeader& image_header = image_space->GetImageHeader(); 1063 image_oat_checksum = image_header.GetOatChecksum(); 1064 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1065 image_patch_delta = image_header.GetPatchDelta(); 1066 } else { 1067 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1068 image_space->GetImageLocation().c_str(), instruction_set)); 1069 image_oat_checksum = image_header->GetOatChecksum(); 1070 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1071 image_patch_delta = image_header->GetPatchDelta(); 1072 } 1073 const OatHeader& oat_header = oat_file->GetOatHeader(); 1074 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1075 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1076 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1077 if (!ret) { 1078 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1079 oat_file->GetLocation().c_str(), 1080 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1081 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1082 oat_file->GetOatHeader().GetImagePatchDelta(), 1083 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1084 } 1085 return ret; 1086} 1087 1088bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1089 const char* dex_location, 1090 uint32_t dex_location_checksum, 1091 const InstructionSet instruction_set, 1092 std::string* error_msg) { 1093 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1094 return false; 1095 } 1096 1097 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1098 &dex_location_checksum); 1099 if (oat_dex_file == NULL) { 1100 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1101 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1102 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 1103 for (size_t i = 0; i < oat_dex_files.size(); i++) { 1104 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 1105 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 1106 oat_file->GetLocation().c_str(), 1107 oat_dex_file->GetDexFileLocation().c_str()); 1108 } 1109 return false; 1110 } 1111 1112 if (dex_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) { 1113 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1114 oat_file->GetLocation().c_str(), 1115 oat_dex_file->GetDexFileLocationChecksum(), 1116 dex_location, dex_location_checksum); 1117 return false; 1118 } 1119 return true; 1120} 1121 1122bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1123 const char* dex_location, 1124 std::string* error_msg) { 1125 CHECK(oat_file != nullptr); 1126 CHECK(dex_location != nullptr); 1127 std::unique_ptr<const DexFile> dex_file; 1128 uint32_t dex_location_checksum; 1129 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 1130 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1131 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1132 // directory. 1133 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1134 if (oat_dex_file == nullptr) { 1135 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1136 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1137 error_msg->c_str()); 1138 return false; 1139 } 1140 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1141 } else { 1142 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, dex_location_checksum, 1143 kRuntimeISA, error_msg); 1144 if (!verified) { 1145 return false; 1146 } 1147 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1148 &dex_location_checksum)->OpenDexFile(error_msg)); 1149 } 1150 return dex_file.get() != nullptr; 1151} 1152 1153const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1154 const char* dex_location, 1155 const uint32_t* const dex_location_checksum, 1156 InstructionSet isa, 1157 std::vector<std::string>* error_msgs, 1158 bool* obsolete_file_cleanup_failed) { 1159 *obsolete_file_cleanup_failed = false; 1160 bool already_opened = false; 1161 std::string dex_location_str(dex_location); 1162 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1163 &already_opened, 1164 obsolete_file_cleanup_failed, 1165 error_msgs)); 1166 std::string error_msg; 1167 if (oat_file.get() == nullptr) { 1168 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1169 dex_location)); 1170 return nullptr; 1171 } else if (oat_file->IsExecutable() && 1172 !VerifyOatWithDexFile(oat_file.get(), dex_location, &error_msg)) { 1173 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1174 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1175 error_msg.c_str())); 1176 return nullptr; 1177 } else if (!oat_file->IsExecutable() && 1178 Runtime::Current()->GetHeap()->HasImageSpace() && 1179 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1180 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1181 "dex location '%s'. Image checksum incorrect.", 1182 oat_file->GetLocation().c_str(), dex_location)); 1183 return nullptr; 1184 } else { 1185 return oat_file.release(); 1186 } 1187} 1188 1189const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1190 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1191 for (size_t i = 0; i < oat_files_.size(); i++) { 1192 const OatFile* oat_file = oat_files_[i]; 1193 DCHECK(oat_file != nullptr); 1194 if (oat_file->GetLocation() == oat_location) { 1195 return oat_file; 1196 } 1197 } 1198 return nullptr; 1199} 1200 1201const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1202 InstructionSet isa, 1203 bool *already_opened, 1204 bool *obsolete_file_cleanup_failed, 1205 std::vector<std::string>* error_msgs) { 1206 // Find out if we've already opened the file 1207 const OatFile* ret = nullptr; 1208 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1209 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1210 if (ret != nullptr) { 1211 *already_opened = true; 1212 return ret; 1213 } 1214 1215 std::string dalvik_cache; 1216 bool have_android_data = false; 1217 bool have_dalvik_cache = false; 1218 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1219 &have_android_data, &have_dalvik_cache); 1220 std::string cache_filename; 1221 if (have_dalvik_cache) { 1222 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1223 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1224 if (ret != nullptr) { 1225 *already_opened = true; 1226 return ret; 1227 } 1228 } else { 1229 // If we need to relocate we should just place odex back where it started. 1230 cache_filename = odex_filename; 1231 } 1232 1233 ret = nullptr; 1234 1235 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1236 // 1237 // Now we do the following: 1238 // 1) Try and open the odex version 1239 // 2) If present, checksum-verified & relocated correctly return it 1240 // 3) Close the odex version to free up its address space. 1241 // 4) Try and open the cache version 1242 // 5) If present, checksum-verified & relocated correctly return it 1243 // 6) Close the cache version to free up its address space. 1244 // 7) If we should relocate: 1245 // a) If we have opened and checksum-verified the odex version relocate it to 1246 // 'cache_filename' and return it 1247 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1248 // it. This should not happen often (I think only the run-test's will hit this case). 1249 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1250 // this point. 1251 // 9) Return nullptr 1252 1253 *already_opened = false; 1254 const Runtime* runtime = Runtime::Current(); 1255 CHECK(runtime != nullptr); 1256 bool executable = !runtime->IsCompiler(); 1257 1258 std::string odex_error_msg; 1259 bool should_patch_system = false; 1260 bool odex_checksum_verified = false; 1261 bool have_system_odex = false; 1262 { 1263 // There is a high probability that these both these oat files map similar/the same address 1264 // spaces so we must scope them like this so they each gets its turn. 1265 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, NULL, 1266 executable, &odex_error_msg)); 1267 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1268 &odex_checksum_verified, 1269 &odex_error_msg)) { 1270 error_msgs->push_back(odex_error_msg); 1271 return odex_oat_file.release(); 1272 } else { 1273 if (odex_checksum_verified) { 1274 // We can just relocate 1275 should_patch_system = true; 1276 odex_error_msg = "Image Patches are incorrect"; 1277 } 1278 if (odex_oat_file.get() != nullptr) { 1279 have_system_odex = true; 1280 } 1281 } 1282 } 1283 1284 std::string cache_error_msg; 1285 bool should_patch_cache = false; 1286 bool cache_checksum_verified = false; 1287 if (have_dalvik_cache) { 1288 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, NULL, 1289 executable, &cache_error_msg)); 1290 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1291 &cache_checksum_verified, 1292 &cache_error_msg)) { 1293 error_msgs->push_back(cache_error_msg); 1294 return cache_oat_file.release(); 1295 } else if (cache_checksum_verified) { 1296 // We can just relocate 1297 should_patch_cache = true; 1298 cache_error_msg = "Image Patches are incorrect"; 1299 } 1300 } else if (have_android_data) { 1301 // dalvik_cache does not exist but android data does. This means we should be able to create 1302 // it, so we should try. 1303 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1304 } 1305 1306 ret = nullptr; 1307 std::string error_msg; 1308 if (runtime->CanRelocate()) { 1309 // Run relocation 1310 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1311 if (space != nullptr) { 1312 const std::string& image_location = space->GetImageLocation(); 1313 if (odex_checksum_verified && should_patch_system) { 1314 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1315 } else if (cache_checksum_verified && should_patch_cache) { 1316 CHECK(have_dalvik_cache); 1317 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1318 } 1319 } else if (have_system_odex) { 1320 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1321 } 1322 } 1323 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1324 // implicitly: were able to fine where the cached version is but we were unable to use it, 1325 // either as a destination for relocation or to open a file. We should delete it if it is 1326 // there. 1327 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1328 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1329 "searching for dex file %s: %s", 1330 cache_filename.c_str(), dex_location.c_str(), 1331 strerror(errno)); 1332 error_msgs->push_back(rm_error_msg); 1333 VLOG(class_linker) << rm_error_msg; 1334 // Let the caller know that we couldn't remove the obsolete file. 1335 // This is a good indication that further writes may fail as well. 1336 *obsolete_file_cleanup_failed = true; 1337 } 1338 } 1339 if (ret == nullptr) { 1340 VLOG(class_linker) << error_msg; 1341 error_msgs->push_back(error_msg); 1342 std::string relocation_msg; 1343 if (runtime->CanRelocate()) { 1344 relocation_msg = StringPrintf(" and relocation failed"); 1345 } 1346 if (have_dalvik_cache && cache_checksum_verified) { 1347 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1348 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1349 cache_filename.c_str(), cache_error_msg.c_str(), 1350 relocation_msg.c_str()); 1351 } else { 1352 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1353 "dalvik_cache availible)%s.", odex_filename.c_str(), 1354 odex_error_msg.c_str(), relocation_msg.c_str()); 1355 } 1356 VLOG(class_linker) << error_msg; 1357 error_msgs->push_back(error_msg); 1358 } 1359 return ret; 1360} 1361 1362const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1363 InstructionSet isa, 1364 std::string* error_msg) { 1365 // We open it non-executable 1366 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, NULL, false, error_msg)); 1367 if (output.get() == nullptr) { 1368 return nullptr; 1369 } 1370 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1371 VerifyOatImageChecksum(output.get(), isa)) { 1372 return output.release(); 1373 } else { 1374 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1375 oat_path.c_str()); 1376 return nullptr; 1377 } 1378} 1379 1380const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1381 const std::string& output_oat, 1382 const std::string& image_location, 1383 InstructionSet isa, 1384 std::string* error_msg) { 1385 if (!Runtime::Current()->GetHeap()->HasImageSpace()) { 1386 // We don't have an image space so there is no point in trying to patchoat. 1387 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1388 << "running without an image. Attempting to use oat file for interpretation."; 1389 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1390 } 1391 if (!Runtime::Current()->IsDex2OatEnabled()) { 1392 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1393 // input_oat but make sure we only do interpretation on it's dex files. 1394 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1395 << "disabled. Attempting to use oat file for interpretation"; 1396 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1397 } 1398 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1399 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1400 1401 std::string isa_arg("--instruction-set="); 1402 isa_arg += GetInstructionSetString(isa); 1403 std::string input_oat_filename_arg("--input-oat-file="); 1404 input_oat_filename_arg += input_oat; 1405 std::string output_oat_filename_arg("--output-oat-file="); 1406 output_oat_filename_arg += output_oat; 1407 std::string patched_image_arg("--patched-image-location="); 1408 patched_image_arg += image_location; 1409 1410 std::vector<std::string> argv; 1411 argv.push_back(patchoat); 1412 argv.push_back(isa_arg); 1413 argv.push_back(input_oat_filename_arg); 1414 argv.push_back(output_oat_filename_arg); 1415 argv.push_back(patched_image_arg); 1416 1417 std::string command_line(Join(argv, ' ')); 1418 LOG(INFO) << "Relocate Oat File: " << command_line; 1419 bool success = Exec(argv, error_msg); 1420 if (success) { 1421 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, NULL, 1422 !Runtime::Current()->IsCompiler(), error_msg)); 1423 bool checksum_verified = false; 1424 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1425 return output.release(); 1426 } else if (output.get() != nullptr) { 1427 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1428 "but output file '%s' failed verifcation: %s", 1429 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1430 } else { 1431 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1432 "but was unable to open output file '%s': %s", 1433 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1434 } 1435 } else if (!Runtime::Current()->IsCompiler()) { 1436 // patchoat failed which means we probably don't have enough room to place the output oat file, 1437 // instead of failing we should just run the interpreter from the dex files in the input oat. 1438 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1439 << "for interpretation. patchoat failure was: " << *error_msg; 1440 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1441 } else { 1442 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1443 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1444 error_msg->c_str()); 1445 } 1446 return nullptr; 1447} 1448 1449int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1450 Runtime* runtime = Runtime::Current(); 1451 int32_t real_patch_delta; 1452 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1453 CHECK(image_space != nullptr); 1454 if (isa == Runtime::Current()->GetInstructionSet()) { 1455 const ImageHeader& image_header = image_space->GetImageHeader(); 1456 real_patch_delta = image_header.GetPatchDelta(); 1457 } else { 1458 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1459 image_space->GetImageLocation().c_str(), isa)); 1460 real_patch_delta = image_header->GetPatchDelta(); 1461 } 1462 const OatHeader& oat_header = oat_file->GetOatHeader(); 1463 return real_patch_delta - oat_header.GetImagePatchDelta(); 1464} 1465 1466bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1467 bool* checksum_verified, 1468 std::string* error_msg) { 1469 std::string compound_msg("Oat file failed to verify: "); 1470 Runtime* runtime = Runtime::Current(); 1471 uint32_t real_image_checksum; 1472 void* real_image_oat_offset; 1473 int32_t real_patch_delta; 1474 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1475 if (image_space == nullptr) { 1476 *error_msg = "No image space present"; 1477 return false; 1478 } 1479 if (isa == Runtime::Current()->GetInstructionSet()) { 1480 const ImageHeader& image_header = image_space->GetImageHeader(); 1481 real_image_checksum = image_header.GetOatChecksum(); 1482 real_image_oat_offset = image_header.GetOatDataBegin(); 1483 real_patch_delta = image_header.GetPatchDelta(); 1484 } else { 1485 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1486 image_space->GetImageLocation().c_str(), isa)); 1487 real_image_checksum = image_header->GetOatChecksum(); 1488 real_image_oat_offset = image_header->GetOatDataBegin(); 1489 real_patch_delta = image_header->GetPatchDelta(); 1490 } 1491 1492 const OatHeader& oat_header = oat_file->GetOatHeader(); 1493 1494 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1495 *checksum_verified = oat_image_checksum == real_image_checksum; 1496 if (!*checksum_verified) { 1497 compound_msg += StringPrintf(" Oat Image Checksum Incorrect (expected 0x%x, recieved 0x%x)", 1498 real_image_checksum, oat_image_checksum); 1499 } 1500 1501 void* oat_image_oat_offset = 1502 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1503 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1504 if (!offset_verified) { 1505 compound_msg += StringPrintf(" Oat Image oat offset incorrect (expected 0x%p, recieved 0x%p)", 1506 real_image_oat_offset, oat_image_oat_offset); 1507 } 1508 1509 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1510 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1511 if (!patch_delta_verified) { 1512 compound_msg += StringPrintf(" Oat image patch delta incorrect (expected 0x%x, recieved 0x%x)", 1513 real_patch_delta, oat_patch_delta); 1514 } 1515 1516 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1517 if (ret) { 1518 *error_msg = compound_msg; 1519 } 1520 return ret; 1521} 1522 1523const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1524 std::string* error_msg) { 1525 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1526 if (oat_file != nullptr) { 1527 return oat_file; 1528 } 1529 1530 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1531 error_msg); 1532 if (oat_file == NULL) { 1533 return NULL; 1534 } 1535 return oat_file; 1536} 1537 1538static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1539 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1540 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1541 1542 DCHECK(obj != NULL); 1543 DCHECK(class_linker != NULL); 1544 1545 if (obj->IsArtMethod()) { 1546 mirror::ArtMethod* method = obj->AsArtMethod(); 1547 if (!method->IsNative()) { 1548 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1549 if (method != Runtime::Current()->GetResolutionMethod()) { 1550 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1551 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1552 } 1553 } 1554 } 1555} 1556 1557void ClassLinker::InitFromImage() { 1558 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1559 CHECK(!init_done_); 1560 1561 Thread* self = Thread::Current(); 1562 gc::Heap* heap = Runtime::Current()->GetHeap(); 1563 gc::space::ImageSpace* space = heap->GetImageSpace(); 1564 dex_cache_image_class_lookup_required_ = true; 1565 CHECK(space != NULL); 1566 OatFile& oat_file = GetImageOatFile(space); 1567 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1568 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1569 const char* image_file_location = oat_file.GetOatHeader(). 1570 GetStoreValueByKey(OatHeader::kImageLocationKey); 1571 CHECK(image_file_location == nullptr || *image_file_location == 0); 1572 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1573 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1574 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1575 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1576 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1577 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1578 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1579 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1580 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1581 1582 StackHandleScope<1> hs(self); 1583 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1584 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1585 AsObjectArray<mirror::Class>())); 1586 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1587 1588 // Special case of setting up the String class early so that we can test arbitrary objects 1589 // as being Strings or not 1590 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1591 1592 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1593 static_cast<uint32_t>(dex_caches->GetLength())); 1594 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1595 StackHandleScope<1> hs(self); 1596 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1597 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1598 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1599 nullptr); 1600 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1601 std::string error_msg; 1602 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1603 if (dex_file == NULL) { 1604 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1605 << " from within oat file " << oat_file.GetLocation() 1606 << " error '" << error_msg << "'"; 1607 } 1608 1609 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1610 1611 AppendToBootClassPath(*dex_file, dex_cache); 1612 } 1613 1614 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1615 // bitmap walk. 1616 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1617 1618 // Set entry point to interpreter if in InterpretOnly mode. 1619 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1620 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1621 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1622 } 1623 1624 // reinit class_roots_ 1625 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1626 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1627 1628 // reinit array_iftable_ from any array class instance, they should be == 1629 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1630 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1631 // String class root was set above 1632 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1633 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1634 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1635 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1636 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1637 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1638 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1639 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1640 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1641 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1642 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1643 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1644 1645 FinishInit(self); 1646 1647 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1648} 1649 1650void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1651 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1652 if ((flags & kVisitRootFlagAllRoots) != 0) { 1653 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1654 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1655 } 1656 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1657 for (auto& pair : new_class_roots_) { 1658 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1659 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1660 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1661 if (UNLIKELY(new_ref != old_ref)) { 1662 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1663 // corresponding object. This is slow, but luckily for us, this may only happen with a 1664 // concurrent moving GC. 1665 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1666 it != end && it->first == pair.first; ++it) { 1667 // If the class stored matches the old class, update it to the new value. 1668 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1669 it->second = GcRoot<mirror::Class>(new_ref); 1670 } 1671 } 1672 } 1673 } 1674 } 1675 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1676 new_class_roots_.clear(); 1677 } 1678 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1679 log_new_class_table_roots_ = true; 1680 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1681 log_new_class_table_roots_ = false; 1682 } 1683 // We deliberately ignore the class roots in the image since we 1684 // handle image roots by using the MS/CMS rescanning of dirty cards. 1685} 1686 1687// Keep in sync with InitCallback. Anything we visit, we need to 1688// reinit references to when reinitializing a ClassLinker from a 1689// mapped image. 1690void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1691 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1692 Thread* self = Thread::Current(); 1693 { 1694 ReaderMutexLock mu(self, dex_lock_); 1695 if ((flags & kVisitRootFlagAllRoots) != 0) { 1696 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1697 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1698 } 1699 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1700 for (size_t index : new_dex_cache_roots_) { 1701 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1702 } 1703 } 1704 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1705 new_dex_cache_roots_.clear(); 1706 } 1707 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1708 log_new_dex_caches_roots_ = true; 1709 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1710 log_new_dex_caches_roots_ = false; 1711 } 1712 } 1713 VisitClassRoots(callback, arg, flags); 1714 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1715 DCHECK(!array_iftable_.IsNull()); 1716 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1717 if (!find_array_class_cache_[i].IsNull()) { 1718 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1719 } 1720 } 1721} 1722 1723void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1724 if (dex_cache_image_class_lookup_required_) { 1725 MoveImageClassesToClassTable(); 1726 } 1727 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1728 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1729 mirror::Class* c = it.second.Read(); 1730 if (!visitor(c, arg)) { 1731 return; 1732 } 1733 } 1734} 1735 1736static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1737 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1738 classes->insert(c); 1739 return true; 1740} 1741 1742void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1743 std::set<mirror::Class*> classes; 1744 VisitClasses(GetClassesVisitor, &classes); 1745 for (mirror::Class* klass : classes) { 1746 if (!visitor(klass, arg)) { 1747 return; 1748 } 1749 } 1750} 1751 1752ClassLinker::~ClassLinker() { 1753 mirror::Class::ResetClass(); 1754 mirror::String::ResetClass(); 1755 mirror::Reference::ResetClass(); 1756 mirror::ArtField::ResetClass(); 1757 mirror::ArtMethod::ResetClass(); 1758 mirror::BooleanArray::ResetArrayClass(); 1759 mirror::ByteArray::ResetArrayClass(); 1760 mirror::CharArray::ResetArrayClass(); 1761 mirror::DoubleArray::ResetArrayClass(); 1762 mirror::FloatArray::ResetArrayClass(); 1763 mirror::IntArray::ResetArrayClass(); 1764 mirror::LongArray::ResetArrayClass(); 1765 mirror::ShortArray::ResetArrayClass(); 1766 mirror::Throwable::ResetClass(); 1767 mirror::StackTraceElement::ResetClass(); 1768 STLDeleteElements(&boot_class_path_); 1769 STLDeleteElements(&oat_files_); 1770} 1771 1772mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1773 gc::Heap* heap = Runtime::Current()->GetHeap(); 1774 StackHandleScope<16> hs(self); 1775 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1776 Handle<mirror::DexCache> dex_cache( 1777 hs.NewHandle(down_cast<mirror::DexCache*>( 1778 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1779 VoidFunctor())))); 1780 if (dex_cache.Get() == NULL) { 1781 return NULL; 1782 } 1783 Handle<mirror::String> 1784 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1785 if (location.Get() == NULL) { 1786 return NULL; 1787 } 1788 Handle<mirror::ObjectArray<mirror::String>> 1789 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1790 if (strings.Get() == NULL) { 1791 return NULL; 1792 } 1793 Handle<mirror::ObjectArray<mirror::Class>> 1794 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1795 if (types.Get() == NULL) { 1796 return NULL; 1797 } 1798 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1799 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1800 if (methods.Get() == NULL) { 1801 return NULL; 1802 } 1803 Handle<mirror::ObjectArray<mirror::ArtField>> 1804 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1805 if (fields.Get() == NULL) { 1806 return NULL; 1807 } 1808 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1809 fields.Get()); 1810 return dex_cache.Get(); 1811} 1812 1813mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1814 uint32_t class_size) { 1815 DCHECK_GE(class_size, sizeof(mirror::Class)); 1816 gc::Heap* heap = Runtime::Current()->GetHeap(); 1817 mirror::Class::InitializeClassVisitor visitor(class_size); 1818 mirror::Object* k = kMovingClasses ? 1819 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1820 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1821 if (UNLIKELY(k == nullptr)) { 1822 CHECK(self->IsExceptionPending()); // OOME. 1823 return nullptr; 1824 } 1825 return k->AsClass(); 1826} 1827 1828mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1829 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1830} 1831 1832mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1833 return down_cast<mirror::ArtField*>( 1834 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1835} 1836 1837mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1838 return down_cast<mirror::ArtMethod*>( 1839 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1840} 1841 1842mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1843 Thread* self, size_t length) { 1844 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1845 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1846} 1847 1848mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1849 mirror::Class* klass) { 1850 DCHECK(klass != NULL); 1851 1852 // For temporary classes we must wait for them to be retired. 1853 if (init_done_ && klass->IsTemp()) { 1854 CHECK(!klass->IsResolved()); 1855 if (klass->IsErroneous()) { 1856 ThrowEarlierClassFailure(klass); 1857 return nullptr; 1858 } 1859 StackHandleScope<1> hs(self); 1860 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1861 ObjectLock<mirror::Class> lock(self, h_class); 1862 // Loop and wait for the resolving thread to retire this class. 1863 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1864 lock.WaitIgnoringInterrupts(); 1865 } 1866 if (h_class->IsErroneous()) { 1867 ThrowEarlierClassFailure(h_class.Get()); 1868 return nullptr; 1869 } 1870 CHECK(h_class->IsRetired()); 1871 // Get the updated class from class table. 1872 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1873 } 1874 1875 // Wait for the class if it has not already been linked. 1876 if (!klass->IsResolved() && !klass->IsErroneous()) { 1877 StackHandleScope<1> hs(self); 1878 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1879 ObjectLock<mirror::Class> lock(self, h_class); 1880 // Check for circular dependencies between classes. 1881 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1882 ThrowClassCircularityError(h_class.Get()); 1883 h_class->SetStatus(mirror::Class::kStatusError, self); 1884 return nullptr; 1885 } 1886 // Wait for the pending initialization to complete. 1887 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1888 lock.WaitIgnoringInterrupts(); 1889 } 1890 } 1891 1892 if (klass->IsErroneous()) { 1893 ThrowEarlierClassFailure(klass); 1894 return nullptr; 1895 } 1896 // Return the loaded class. No exceptions should be pending. 1897 CHECK(klass->IsResolved()) << PrettyClass(klass); 1898 self->AssertNoPendingException(); 1899 return klass; 1900} 1901 1902mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1903 Handle<mirror::ClassLoader> class_loader) { 1904 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1905 DCHECK(self != nullptr); 1906 self->AssertNoPendingException(); 1907 if (descriptor[1] == '\0') { 1908 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1909 // for primitive classes that aren't backed by dex files. 1910 return FindPrimitiveClass(descriptor[0]); 1911 } 1912 // Find the class in the loaded classes table. 1913 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1914 if (klass != NULL) { 1915 return EnsureResolved(self, descriptor, klass); 1916 } 1917 // Class is not yet loaded. 1918 if (descriptor[0] == '[') { 1919 return CreateArrayClass(self, descriptor, class_loader); 1920 } else if (class_loader.Get() == nullptr) { 1921 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1922 if (pair.second != NULL) { 1923 StackHandleScope<1> hs(self); 1924 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1925 } 1926 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1927 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1928 // throw of a NoClassDefFoundError. 1929 if (IsInBootClassPath(descriptor)) { 1930 mirror::Class* system_class = FindSystemClass(self, descriptor); 1931 CHECK(system_class != NULL); 1932 return system_class; 1933 } 1934 // Next try the compile time class path. 1935 const std::vector<const DexFile*>* class_path; 1936 { 1937 ScopedObjectAccessUnchecked soa(self); 1938 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1939 soa.AddLocalReference<jobject>(class_loader.Get())); 1940 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1941 } 1942 1943 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1944 if (pair.second != NULL) { 1945 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1946 } 1947 1948 } else { 1949 ScopedObjectAccessUnchecked soa(self); 1950 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1951 soa.AddLocalReference<jobject>(class_loader.Get())); 1952 std::string class_name_string(DescriptorToDot(descriptor)); 1953 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1954 { 1955 ScopedThreadStateChange tsc(self, kNative); 1956 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1957 soa.Env()->NewStringUTF(class_name_string.c_str())); 1958 if (class_name_object.get() == NULL) { 1959 return NULL; 1960 } 1961 CHECK(class_loader_object.get() != NULL); 1962 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1963 WellKnownClasses::java_lang_ClassLoader_loadClass, 1964 class_name_object.get())); 1965 } 1966 if (self->IsExceptionPending()) { 1967 // If the ClassLoader threw, pass that exception up. 1968 return NULL; 1969 } else if (result.get() == NULL) { 1970 // broken loader - throw NPE to be compatible with Dalvik 1971 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1972 class_name_string.c_str()).c_str()); 1973 return NULL; 1974 } else { 1975 // success, return mirror::Class* 1976 return soa.Decode<mirror::Class*>(result.get()); 1977 } 1978 } 1979 1980 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1981 return NULL; 1982} 1983 1984mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1985 Handle<mirror::ClassLoader> class_loader, 1986 const DexFile& dex_file, 1987 const DexFile::ClassDef& dex_class_def) { 1988 Thread* self = Thread::Current(); 1989 StackHandleScope<3> hs(self); 1990 auto klass = hs.NewHandle<mirror::Class>(nullptr); 1991 bool should_allocate = false; 1992 1993 // Load the class from the dex file. 1994 if (UNLIKELY(!init_done_)) { 1995 // finish up init of hand crafted class_roots_ 1996 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1997 klass.Assign(GetClassRoot(kJavaLangObject)); 1998 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1999 klass.Assign(GetClassRoot(kJavaLangClass)); 2000 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2001 klass.Assign(GetClassRoot(kJavaLangString)); 2002 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2003 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2004 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2005 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2006 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2007 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2008 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2009 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2010 } else { 2011 should_allocate = true; 2012 } 2013 } else { 2014 should_allocate = true; 2015 } 2016 2017 if (should_allocate) { 2018 // Allocate a class with the status of not ready. 2019 // Interface object should get the right size here. Regular class will 2020 // figure out the right size later and be replaced with one of the right 2021 // size when the class becomes resolved. 2022 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2023 } 2024 if (UNLIKELY(klass.Get() == nullptr)) { 2025 CHECK(self->IsExceptionPending()); // Expect an OOME. 2026 return nullptr; 2027 } 2028 klass->SetDexCache(FindDexCache(dex_file)); 2029 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 2030 ObjectLock<mirror::Class> lock(self, klass); 2031 if (self->IsExceptionPending()) { 2032 // An exception occured during load, set status to erroneous while holding klass' lock in case 2033 // notification is necessary. 2034 if (!klass->IsErroneous()) { 2035 klass->SetStatus(mirror::Class::kStatusError, self); 2036 } 2037 return nullptr; 2038 } 2039 klass->SetClinitThreadId(self->GetTid()); 2040 2041 // Add the newly loaded class to the loaded classes table. 2042 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 2043 if (existing != nullptr) { 2044 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2045 // this thread to block. 2046 return EnsureResolved(self, descriptor, existing); 2047 } 2048 2049 // Finish loading (if necessary) by finding parents 2050 CHECK(!klass->IsLoaded()); 2051 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2052 // Loading failed. 2053 if (!klass->IsErroneous()) { 2054 klass->SetStatus(mirror::Class::kStatusError, self); 2055 } 2056 return nullptr; 2057 } 2058 CHECK(klass->IsLoaded()); 2059 // Link the class (if necessary) 2060 CHECK(!klass->IsResolved()); 2061 // TODO: Use fast jobjects? 2062 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2063 2064 mirror::Class* new_class = nullptr; 2065 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2066 // Linking failed. 2067 if (!klass->IsErroneous()) { 2068 klass->SetStatus(mirror::Class::kStatusError, self); 2069 } 2070 return nullptr; 2071 } 2072 self->AssertNoPendingException(); 2073 CHECK(new_class != nullptr) << descriptor; 2074 CHECK(new_class->IsResolved()) << descriptor; 2075 2076 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2077 2078 /* 2079 * We send CLASS_PREPARE events to the debugger from here. The 2080 * definition of "preparation" is creating the static fields for a 2081 * class and initializing them to the standard default values, but not 2082 * executing any code (that comes later, during "initialization"). 2083 * 2084 * We did the static preparation in LinkClass. 2085 * 2086 * The class has been prepared and resolved but possibly not yet verified 2087 * at this point. 2088 */ 2089 Dbg::PostClassPrepare(new_class_h.Get()); 2090 2091 return new_class_h.Get(); 2092} 2093 2094uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2095 const DexFile::ClassDef& dex_class_def) { 2096 const byte* class_data = dex_file.GetClassData(dex_class_def); 2097 size_t num_ref = 0; 2098 size_t num_32 = 0; 2099 size_t num_64 = 0; 2100 if (class_data != NULL) { 2101 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2102 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2103 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2104 char c = descriptor[0]; 2105 if (c == 'L' || c == '[') { 2106 num_ref++; 2107 } else if (c == 'J' || c == 'D') { 2108 num_64++; 2109 } else { 2110 num_32++; 2111 } 2112 } 2113 } 2114 return mirror::Class::ComputeClassSize(false, 0, num_32, num_64, num_ref); 2115} 2116 2117bool ClassLinker::FindOatClass(const DexFile& dex_file, 2118 uint16_t class_def_idx, 2119 OatFile::OatClass* oat_class) { 2120 DCHECK(oat_class != nullptr); 2121 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2122 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2123 if (oat_file == nullptr) { 2124 return false; 2125 } 2126 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2127 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2128 &dex_location_checksum); 2129 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 2130 *oat_class = oat_dex_file->GetOatClass(class_def_idx); 2131 return true; 2132} 2133 2134static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2135 uint32_t method_idx) { 2136 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2137 const byte* class_data = dex_file.GetClassData(class_def); 2138 CHECK(class_data != NULL); 2139 ClassDataItemIterator it(dex_file, class_data); 2140 // Skip fields 2141 while (it.HasNextStaticField()) { 2142 it.Next(); 2143 } 2144 while (it.HasNextInstanceField()) { 2145 it.Next(); 2146 } 2147 // Process methods 2148 size_t class_def_method_index = 0; 2149 while (it.HasNextDirectMethod()) { 2150 if (it.GetMemberIndex() == method_idx) { 2151 return class_def_method_index; 2152 } 2153 class_def_method_index++; 2154 it.Next(); 2155 } 2156 while (it.HasNextVirtualMethod()) { 2157 if (it.GetMemberIndex() == method_idx) { 2158 return class_def_method_index; 2159 } 2160 class_def_method_index++; 2161 it.Next(); 2162 } 2163 DCHECK(!it.HasNext()); 2164 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2165 return 0; 2166} 2167 2168bool ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, OatFile::OatMethod* oat_method) { 2169 DCHECK(oat_method != nullptr); 2170 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2171 // method for direct methods (or virtual methods made direct). 2172 mirror::Class* declaring_class = method->GetDeclaringClass(); 2173 size_t oat_method_index; 2174 if (method->IsStatic() || method->IsDirect()) { 2175 // Simple case where the oat method index was stashed at load time. 2176 oat_method_index = method->GetMethodIndex(); 2177 } else { 2178 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2179 // by search for its position in the declared virtual methods. 2180 oat_method_index = declaring_class->NumDirectMethods(); 2181 size_t end = declaring_class->NumVirtualMethods(); 2182 bool found = false; 2183 for (size_t i = 0; i < end; i++) { 2184 if (declaring_class->GetVirtualMethod(i) == method) { 2185 found = true; 2186 break; 2187 } 2188 oat_method_index++; 2189 } 2190 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2191 } 2192 DCHECK_EQ(oat_method_index, 2193 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2194 method->GetDeclaringClass()->GetDexClassDefIndex(), 2195 method->GetDexMethodIndex())); 2196 OatFile::OatClass oat_class; 2197 if (!FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2198 declaring_class->GetDexClassDefIndex(), 2199 &oat_class)) { 2200 return false; 2201 } 2202 2203 *oat_method = oat_class.GetOatMethod(oat_method_index); 2204 return true; 2205} 2206 2207// Special case to get oat code without overwriting a trampoline. 2208const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2209 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2210 if (method->IsProxyMethod()) { 2211 return GetQuickProxyInvokeHandler(); 2212 } 2213 OatFile::OatMethod oat_method; 2214 const void* result = nullptr; 2215 if (FindOatMethodFor(method, &oat_method)) { 2216 result = oat_method.GetQuickCode(); 2217 } 2218 2219 if (result == nullptr) { 2220 if (method->IsNative()) { 2221 // No code and native? Use generic trampoline. 2222 result = GetQuickGenericJniTrampoline(); 2223 } else if (method->IsPortableCompiled()) { 2224 // No code? Do we expect portable code? 2225 result = GetQuickToPortableBridge(); 2226 } else { 2227 // No code? You must mean to go into the interpreter. 2228 result = GetQuickToInterpreterBridge(); 2229 } 2230 } 2231 return result; 2232} 2233 2234const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2235 bool* have_portable_code) { 2236 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2237 *have_portable_code = false; 2238 if (method->IsProxyMethod()) { 2239 return GetPortableProxyInvokeHandler(); 2240 } 2241 OatFile::OatMethod oat_method; 2242 const void* result = nullptr; 2243 const void* quick_code = nullptr; 2244 if (FindOatMethodFor(method, &oat_method)) { 2245 result = oat_method.GetPortableCode(); 2246 quick_code = oat_method.GetQuickCode(); 2247 } 2248 2249 if (result == nullptr) { 2250 if (quick_code == nullptr) { 2251 // No code? You must mean to go into the interpreter. 2252 result = GetPortableToInterpreterBridge(); 2253 } else { 2254 // No code? But there's quick code, so use a bridge. 2255 result = GetPortableToQuickBridge(); 2256 } 2257 } else { 2258 *have_portable_code = true; 2259 } 2260 return result; 2261} 2262 2263const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2264 uint32_t method_idx) { 2265 OatFile::OatClass oat_class; 2266 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2267 return nullptr; 2268 } 2269 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2270 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2271} 2272 2273const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2274 uint32_t method_idx) { 2275 OatFile::OatClass oat_class; 2276 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2277 return nullptr; 2278 } 2279 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2280 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2281} 2282 2283// Returns true if the method must run with interpreter, false otherwise. 2284static bool NeedsInterpreter( 2285 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2286 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2287 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2288 // No code: need interpreter. 2289 // May return true for native code, in the case of generic JNI 2290 // DCHECK(!method->IsNative()); 2291 return true; 2292 } 2293#ifdef ART_SEA_IR_MODE 2294 ScopedObjectAccess soa(Thread::Current()); 2295 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2296 LOG(INFO) << "Found " << PrettyMethod(method); 2297 return false; 2298 } 2299#endif 2300 // If interpreter mode is enabled, every method (except native and proxy) must 2301 // be run with interpreter. 2302 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2303 !method->IsNative() && !method->IsProxyMethod(); 2304} 2305 2306void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2307 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2308 if (klass->NumDirectMethods() == 0) { 2309 return; // No direct methods => no static methods. 2310 } 2311 Runtime* runtime = Runtime::Current(); 2312 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2313 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2314 return; // OAT file unavailable. 2315 } 2316 } 2317 2318 const DexFile& dex_file = klass->GetDexFile(); 2319 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2320 CHECK(dex_class_def != nullptr); 2321 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2322 // There should always be class data if there were direct methods. 2323 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2324 ClassDataItemIterator it(dex_file, class_data); 2325 // Skip fields 2326 while (it.HasNextStaticField()) { 2327 it.Next(); 2328 } 2329 while (it.HasNextInstanceField()) { 2330 it.Next(); 2331 } 2332 OatFile::OatClass oat_class; 2333 bool has_oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class); 2334 // Link the code of methods skipped by LinkCode. 2335 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2336 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2337 if (!method->IsStatic()) { 2338 // Only update static methods. 2339 continue; 2340 } 2341 const void* portable_code = nullptr; 2342 const void* quick_code = nullptr; 2343 if (has_oat_class) { 2344 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2345 portable_code = oat_method.GetPortableCode(); 2346 quick_code = oat_method.GetQuickCode(); 2347 } 2348 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2349 bool have_portable_code = false; 2350 if (enter_interpreter) { 2351 // Use interpreter entry point. 2352 // Check whether the method is native, in which case it's generic JNI. 2353 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2354 quick_code = GetQuickGenericJniTrampoline(); 2355 portable_code = GetPortableToQuickBridge(); 2356 } else { 2357 portable_code = GetPortableToInterpreterBridge(); 2358 quick_code = GetQuickToInterpreterBridge(); 2359 } 2360 } else { 2361 if (portable_code == nullptr) { 2362 portable_code = GetPortableToQuickBridge(); 2363 } else { 2364 have_portable_code = true; 2365 } 2366 if (quick_code == nullptr) { 2367 quick_code = GetQuickToPortableBridge(); 2368 } 2369 } 2370 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2371 have_portable_code); 2372 } 2373 // Ignore virtual methods on the iterator. 2374} 2375 2376void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 2377 const DexFile& dex_file, uint32_t dex_method_index, 2378 uint32_t method_index) { 2379 if (Runtime::Current()->IsCompiler()) { 2380 // The following code only applies to a non-compiler runtime. 2381 return; 2382 } 2383 // Method shouldn't have already been linked. 2384 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2385 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2386 if (oat_class != nullptr) { 2387 // Every kind of method should at least get an invoke stub from the oat_method. 2388 // non-abstract methods also get their code pointers. 2389 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2390 oat_method.LinkMethod(method.Get()); 2391 } 2392 2393 // Install entry point from interpreter. 2394 bool enter_interpreter = NeedsInterpreter(method.Get(), 2395 method->GetEntryPointFromQuickCompiledCode(), 2396 method->GetEntryPointFromPortableCompiledCode()); 2397 if (enter_interpreter && !method->IsNative()) { 2398 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2399 } else { 2400 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2401 } 2402 2403 if (method->IsAbstract()) { 2404 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2405 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2406 return; 2407 } 2408 2409 bool have_portable_code = false; 2410 if (method->IsStatic() && !method->IsConstructor()) { 2411 // For static methods excluding the class initializer, install the trampoline. 2412 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2413 // after initializing class (see ClassLinker::InitializeClass method). 2414 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2415 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2416 } else if (enter_interpreter) { 2417 if (!method->IsNative()) { 2418 // Set entry point from compiled code if there's no code or in interpreter only mode. 2419 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2420 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2421 } else { 2422 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2423 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2424 } 2425 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2426 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2427 have_portable_code = true; 2428 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2429 } else { 2430 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2431 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2432 } 2433 2434 if (method->IsNative()) { 2435 // Unregistering restores the dlsym lookup stub. 2436 method->UnregisterNative(Thread::Current()); 2437 2438 if (enter_interpreter) { 2439 // We have a native method here without code. Then it should have either the GenericJni 2440 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2441 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2442 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2443 } 2444 } 2445 2446 // Allow instrumentation its chance to hijack code. 2447 Runtime* runtime = Runtime::Current(); 2448 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2449 method->GetEntryPointFromQuickCompiledCode(), 2450 method->GetEntryPointFromPortableCompiledCode(), 2451 have_portable_code); 2452} 2453 2454void ClassLinker::LoadClass(const DexFile& dex_file, 2455 const DexFile::ClassDef& dex_class_def, 2456 Handle<mirror::Class> klass, 2457 mirror::ClassLoader* class_loader) { 2458 CHECK(klass.Get() != NULL); 2459 CHECK(klass->GetDexCache() != NULL); 2460 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2461 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2462 CHECK(descriptor != NULL); 2463 2464 klass->SetClass(GetClassRoot(kJavaLangClass)); 2465 if (kUseBakerOrBrooksReadBarrier) { 2466 klass->AssertReadBarrierPointer(); 2467 } 2468 uint32_t access_flags = dex_class_def.access_flags_; 2469 // Make sure that none of our runtime-only flags are set. 2470 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2471 klass->SetAccessFlags(access_flags); 2472 klass->SetClassLoader(class_loader); 2473 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2474 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2475 2476 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2477 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2478 2479 const byte* class_data = dex_file.GetClassData(dex_class_def); 2480 if (class_data == NULL) { 2481 return; // no fields or methods - for example a marker interface 2482 } 2483 2484 OatFile::OatClass oat_class; 2485 if (Runtime::Current()->IsStarted() 2486 && !Runtime::Current()->UseCompileTimeClassPath() 2487 && FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class)) { 2488 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2489 } else { 2490 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2491 } 2492} 2493 2494void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2495 const byte* class_data, 2496 Handle<mirror::Class> klass, 2497 mirror::ClassLoader* class_loader, 2498 const OatFile::OatClass* oat_class) { 2499 // Load fields. 2500 ClassDataItemIterator it(dex_file, class_data); 2501 Thread* self = Thread::Current(); 2502 if (it.NumStaticFields() != 0) { 2503 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2504 if (UNLIKELY(statics == NULL)) { 2505 CHECK(self->IsExceptionPending()); // OOME. 2506 return; 2507 } 2508 klass->SetSFields(statics); 2509 } 2510 if (it.NumInstanceFields() != 0) { 2511 mirror::ObjectArray<mirror::ArtField>* fields = 2512 AllocArtFieldArray(self, it.NumInstanceFields()); 2513 if (UNLIKELY(fields == NULL)) { 2514 CHECK(self->IsExceptionPending()); // OOME. 2515 return; 2516 } 2517 klass->SetIFields(fields); 2518 } 2519 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2520 StackHandleScope<1> hs(self); 2521 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2522 if (UNLIKELY(sfield.Get() == NULL)) { 2523 CHECK(self->IsExceptionPending()); // OOME. 2524 return; 2525 } 2526 klass->SetStaticField(i, sfield.Get()); 2527 LoadField(dex_file, it, klass, sfield); 2528 } 2529 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2530 StackHandleScope<1> hs(self); 2531 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2532 if (UNLIKELY(ifield.Get() == NULL)) { 2533 CHECK(self->IsExceptionPending()); // OOME. 2534 return; 2535 } 2536 klass->SetInstanceField(i, ifield.Get()); 2537 LoadField(dex_file, it, klass, ifield); 2538 } 2539 2540 // Load methods. 2541 if (it.NumDirectMethods() != 0) { 2542 // TODO: append direct methods to class object 2543 mirror::ObjectArray<mirror::ArtMethod>* directs = 2544 AllocArtMethodArray(self, it.NumDirectMethods()); 2545 if (UNLIKELY(directs == NULL)) { 2546 CHECK(self->IsExceptionPending()); // OOME. 2547 return; 2548 } 2549 klass->SetDirectMethods(directs); 2550 } 2551 if (it.NumVirtualMethods() != 0) { 2552 // TODO: append direct methods to class object 2553 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2554 AllocArtMethodArray(self, it.NumVirtualMethods()); 2555 if (UNLIKELY(virtuals == NULL)) { 2556 CHECK(self->IsExceptionPending()); // OOME. 2557 return; 2558 } 2559 klass->SetVirtualMethods(virtuals); 2560 } 2561 size_t class_def_method_index = 0; 2562 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2563 StackHandleScope<1> hs(self); 2564 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2565 if (UNLIKELY(method.Get() == NULL)) { 2566 CHECK(self->IsExceptionPending()); // OOME. 2567 return; 2568 } 2569 klass->SetDirectMethod(i, method.Get()); 2570 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2571 method->SetMethodIndex(class_def_method_index); 2572 class_def_method_index++; 2573 } 2574 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2575 StackHandleScope<1> hs(self); 2576 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2577 if (UNLIKELY(method.Get() == NULL)) { 2578 CHECK(self->IsExceptionPending()); // OOME. 2579 return; 2580 } 2581 klass->SetVirtualMethod(i, method.Get()); 2582 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2583 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2584 class_def_method_index++; 2585 } 2586 DCHECK(!it.HasNext()); 2587} 2588 2589void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2590 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2591 uint32_t field_idx = it.GetMemberIndex(); 2592 dst->SetDexFieldIndex(field_idx); 2593 dst->SetDeclaringClass(klass.Get()); 2594 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2595} 2596 2597mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2598 const ClassDataItemIterator& it, 2599 Handle<mirror::Class> klass) { 2600 uint32_t dex_method_idx = it.GetMemberIndex(); 2601 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2602 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2603 2604 mirror::ArtMethod* dst = AllocArtMethod(self); 2605 if (UNLIKELY(dst == NULL)) { 2606 CHECK(self->IsExceptionPending()); // OOME. 2607 return NULL; 2608 } 2609 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2610 2611 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2612 dst->SetDexMethodIndex(dex_method_idx); 2613 dst->SetDeclaringClass(klass.Get()); 2614 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2615 2616 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2617 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2618 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2619 2620 uint32_t access_flags = it.GetMemberAccessFlags(); 2621 2622 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2623 // Set finalizable flag on declaring class. 2624 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2625 // Void return type. 2626 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged. 2627 klass->SetFinalizable(); 2628 } else { 2629 std::string temp; 2630 const char* klass_descriptor = klass->GetDescriptor(&temp); 2631 // The Enum class declares a "final" finalize() method to prevent subclasses from 2632 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2633 // subclasses, so we exclude it here. 2634 // We also want to avoid setting the flag on Object, where we know that finalize() is 2635 // empty. 2636 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2637 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2638 klass->SetFinalizable(); 2639 } 2640 } 2641 } 2642 } else if (method_name[0] == '<') { 2643 // Fix broken access flags for initializers. Bug 11157540. 2644 bool is_init = (strcmp("<init>", method_name) == 0); 2645 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2646 if (UNLIKELY(!is_init && !is_clinit)) { 2647 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2648 } else { 2649 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2650 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2651 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2652 access_flags |= kAccConstructor; 2653 } 2654 } 2655 } 2656 dst->SetAccessFlags(access_flags); 2657 2658 self->EndAssertNoThreadSuspension(old_cause); 2659 return dst; 2660} 2661 2662void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2663 Thread* self = Thread::Current(); 2664 StackHandleScope<1> hs(self); 2665 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2666 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2667 AppendToBootClassPath(dex_file, dex_cache); 2668} 2669 2670void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2671 Handle<mirror::DexCache> dex_cache) { 2672 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2673 boot_class_path_.push_back(&dex_file); 2674 RegisterDexFile(dex_file, dex_cache); 2675} 2676 2677bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2678 dex_lock_.AssertSharedHeld(Thread::Current()); 2679 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2680 mirror::DexCache* dex_cache = GetDexCache(i); 2681 if (dex_cache->GetDexFile() == &dex_file) { 2682 return true; 2683 } 2684 } 2685 return false; 2686} 2687 2688bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2689 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2690 return IsDexFileRegisteredLocked(dex_file); 2691} 2692 2693void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2694 Handle<mirror::DexCache> dex_cache) { 2695 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2696 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2697 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2698 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2699 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2700 dex_cache->SetDexFile(&dex_file); 2701 if (log_new_dex_caches_roots_) { 2702 // TODO: This is not safe if we can remove dex caches. 2703 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2704 } 2705} 2706 2707void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2708 Thread* self = Thread::Current(); 2709 { 2710 ReaderMutexLock mu(self, dex_lock_); 2711 if (IsDexFileRegisteredLocked(dex_file)) { 2712 return; 2713 } 2714 } 2715 // Don't alloc while holding the lock, since allocation may need to 2716 // suspend all threads and another thread may need the dex_lock_ to 2717 // get to a suspend point. 2718 StackHandleScope<1> hs(self); 2719 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2720 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2721 { 2722 WriterMutexLock mu(self, dex_lock_); 2723 if (IsDexFileRegisteredLocked(dex_file)) { 2724 return; 2725 } 2726 RegisterDexFileLocked(dex_file, dex_cache); 2727 } 2728} 2729 2730void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2731 Handle<mirror::DexCache> dex_cache) { 2732 WriterMutexLock mu(Thread::Current(), dex_lock_); 2733 RegisterDexFileLocked(dex_file, dex_cache); 2734} 2735 2736mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2737 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2738 // Search assuming unique-ness of dex file. 2739 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2740 mirror::DexCache* dex_cache = GetDexCache(i); 2741 if (dex_cache->GetDexFile() == &dex_file) { 2742 return dex_cache; 2743 } 2744 } 2745 // Search matching by location name. 2746 std::string location(dex_file.GetLocation()); 2747 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2748 mirror::DexCache* dex_cache = GetDexCache(i); 2749 if (dex_cache->GetDexFile()->GetLocation() == location) { 2750 return dex_cache; 2751 } 2752 } 2753 // Failure, dump diagnostic and abort. 2754 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2755 mirror::DexCache* dex_cache = GetDexCache(i); 2756 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2757 } 2758 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2759 return NULL; 2760} 2761 2762void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2763 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2764 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2765 mirror::DexCache* dex_cache = GetDexCache(i); 2766 dex_cache->Fixup(resolution_method); 2767 } 2768} 2769 2770mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2771 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 2772 if (UNLIKELY(klass == NULL)) { 2773 return NULL; 2774 } 2775 return InitializePrimitiveClass(klass, type); 2776} 2777 2778mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2779 Primitive::Type type) { 2780 CHECK(primitive_class != NULL); 2781 // Must hold lock on object when initializing. 2782 Thread* self = Thread::Current(); 2783 StackHandleScope<1> hs(self); 2784 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2785 ObjectLock<mirror::Class> lock(self, h_class); 2786 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2787 primitive_class->SetPrimitiveType(type); 2788 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2789 const char* descriptor = Primitive::Descriptor(type); 2790 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2791 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2792 return primitive_class; 2793} 2794 2795// Create an array class (i.e. the class object for the array, not the 2796// array itself). "descriptor" looks like "[C" or "[[[[B" or 2797// "[Ljava/lang/String;". 2798// 2799// If "descriptor" refers to an array of primitives, look up the 2800// primitive type's internally-generated class object. 2801// 2802// "class_loader" is the class loader of the class that's referring to 2803// us. It's used to ensure that we're looking for the element type in 2804// the right context. It does NOT become the class loader for the 2805// array class; that always comes from the base element class. 2806// 2807// Returns NULL with an exception raised on failure. 2808mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2809 Handle<mirror::ClassLoader> class_loader) { 2810 // Identify the underlying component type 2811 CHECK_EQ('[', descriptor[0]); 2812 StackHandleScope<2> hs(self); 2813 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2814 if (component_type.Get() == nullptr) { 2815 DCHECK(self->IsExceptionPending()); 2816 // We need to accept erroneous classes as component types. 2817 component_type.Assign(LookupClass(descriptor + 1, class_loader.Get())); 2818 if (component_type.Get() == nullptr) { 2819 DCHECK(self->IsExceptionPending()); 2820 return nullptr; 2821 } else { 2822 self->ClearException(); 2823 } 2824 } 2825 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2826 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2827 return nullptr; 2828 } 2829 // See if the component type is already loaded. Array classes are 2830 // always associated with the class loader of their underlying 2831 // element type -- an array of Strings goes with the loader for 2832 // java/lang/String -- so we need to look for it there. (The 2833 // caller should have checked for the existence of the class 2834 // before calling here, but they did so with *their* class loader, 2835 // not the component type's loader.) 2836 // 2837 // If we find it, the caller adds "loader" to the class' initiating 2838 // loader list, which should prevent us from going through this again. 2839 // 2840 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2841 // are the same, because our caller (FindClass) just did the 2842 // lookup. (Even if we get this wrong we still have correct behavior, 2843 // because we effectively do this lookup again when we add the new 2844 // class to the hash table --- necessary because of possible races with 2845 // other threads.) 2846 if (class_loader.Get() != component_type->GetClassLoader()) { 2847 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2848 if (new_class != NULL) { 2849 return new_class; 2850 } 2851 } 2852 2853 // Fill out the fields in the Class. 2854 // 2855 // It is possible to execute some methods against arrays, because 2856 // all arrays are subclasses of java_lang_Object_, so we need to set 2857 // up a vtable. We can just point at the one in java_lang_Object_. 2858 // 2859 // Array classes are simple enough that we don't need to do a full 2860 // link step. 2861 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2862 if (UNLIKELY(!init_done_)) { 2863 // Classes that were hand created, ie not by FindSystemClass 2864 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2865 new_class.Assign(GetClassRoot(kClassArrayClass)); 2866 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2867 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2868 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2869 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2870 } else if (strcmp(descriptor, 2871 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2872 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2873 } else if (strcmp(descriptor, 2874 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2875 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2876 } else if (strcmp(descriptor, "[C") == 0) { 2877 new_class.Assign(GetClassRoot(kCharArrayClass)); 2878 } else if (strcmp(descriptor, "[I") == 0) { 2879 new_class.Assign(GetClassRoot(kIntArrayClass)); 2880 } 2881 } 2882 if (new_class.Get() == nullptr) { 2883 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 2884 if (new_class.Get() == nullptr) { 2885 return nullptr; 2886 } 2887 new_class->SetComponentType(component_type.Get()); 2888 } 2889 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2890 DCHECK(new_class->GetComponentType() != NULL); 2891 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2892 new_class->SetSuperClass(java_lang_Object); 2893 new_class->SetVTable(java_lang_Object->GetVTable()); 2894 new_class->SetPrimitiveType(Primitive::kPrimNot); 2895 new_class->SetClassLoader(component_type->GetClassLoader()); 2896 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 2897 new_class->PopulateEmbeddedImtAndVTable(); 2898 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2899 // don't need to set new_class->SetObjectSize(..) 2900 // because Object::SizeOf delegates to Array::SizeOf 2901 2902 2903 // All arrays have java/lang/Cloneable and java/io/Serializable as 2904 // interfaces. We need to set that up here, so that stuff like 2905 // "instanceof" works right. 2906 // 2907 // Note: The GC could run during the call to FindSystemClass, 2908 // so we need to make sure the class object is GC-valid while we're in 2909 // there. Do this by clearing the interface list so the GC will just 2910 // think that the entries are null. 2911 2912 2913 // Use the single, global copies of "interfaces" and "iftable" 2914 // (remember not to free them for arrays). 2915 { 2916 mirror::IfTable* array_iftable = array_iftable_.Read(); 2917 CHECK(array_iftable != nullptr); 2918 new_class->SetIfTable(array_iftable); 2919 } 2920 2921 // Inherit access flags from the component type. 2922 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2923 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2924 access_flags &= kAccJavaFlagsMask; 2925 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2926 // and remove "interface". 2927 access_flags |= kAccAbstract | kAccFinal; 2928 access_flags &= ~kAccInterface; 2929 2930 new_class->SetAccessFlags(access_flags); 2931 2932 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2933 if (existing == nullptr) { 2934 return new_class.Get(); 2935 } 2936 // Another thread must have loaded the class after we 2937 // started but before we finished. Abandon what we've 2938 // done. 2939 // 2940 // (Yes, this happens.) 2941 2942 return existing; 2943} 2944 2945mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2946 switch (type) { 2947 case 'B': 2948 return GetClassRoot(kPrimitiveByte); 2949 case 'C': 2950 return GetClassRoot(kPrimitiveChar); 2951 case 'D': 2952 return GetClassRoot(kPrimitiveDouble); 2953 case 'F': 2954 return GetClassRoot(kPrimitiveFloat); 2955 case 'I': 2956 return GetClassRoot(kPrimitiveInt); 2957 case 'J': 2958 return GetClassRoot(kPrimitiveLong); 2959 case 'S': 2960 return GetClassRoot(kPrimitiveShort); 2961 case 'Z': 2962 return GetClassRoot(kPrimitiveBoolean); 2963 case 'V': 2964 return GetClassRoot(kPrimitiveVoid); 2965 default: 2966 break; 2967 } 2968 std::string printable_type(PrintableChar(type)); 2969 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2970 return NULL; 2971} 2972 2973mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2974 size_t hash) { 2975 if (VLOG_IS_ON(class_linker)) { 2976 mirror::DexCache* dex_cache = klass->GetDexCache(); 2977 std::string source; 2978 if (dex_cache != NULL) { 2979 source += " from "; 2980 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2981 } 2982 LOG(INFO) << "Loaded class " << descriptor << source; 2983 } 2984 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2985 mirror::Class* existing = 2986 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2987 if (existing != NULL) { 2988 return existing; 2989 } 2990 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == NULL && 2991 dex_cache_image_class_lookup_required_) { 2992 // Check a class loaded with the system class loader matches one in the image if the class 2993 // is in the image. 2994 existing = LookupClassFromImage(descriptor); 2995 if (existing != NULL) { 2996 CHECK(klass == existing); 2997 } 2998 } 2999 VerifyObject(klass); 3000 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3001 if (log_new_class_table_roots_) { 3002 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3003 } 3004 return NULL; 3005} 3006 3007mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3008 size_t hash) { 3009 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3010 mirror::Class* existing = 3011 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3012 3013 if (existing == nullptr) { 3014 CHECK(klass->IsProxyClass()); 3015 return nullptr; 3016 } 3017 3018 CHECK_NE(existing, klass) << descriptor; 3019 CHECK(!existing->IsResolved()) << descriptor; 3020 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3021 3022 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 3023 ++it) { 3024 mirror::Class* klass = it->second.Read(); 3025 if (klass == existing) { 3026 class_table_.erase(it); 3027 break; 3028 } 3029 } 3030 3031 CHECK(!klass->IsTemp()) << descriptor; 3032 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3033 dex_cache_image_class_lookup_required_) { 3034 // Check a class loaded with the system class loader matches one in the image if the class 3035 // is in the image. 3036 existing = LookupClassFromImage(descriptor); 3037 if (existing != nullptr) { 3038 CHECK(klass == existing) << descriptor; 3039 } 3040 } 3041 VerifyObject(klass); 3042 3043 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3044 if (log_new_class_table_roots_) { 3045 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3046 } 3047 3048 return existing; 3049} 3050 3051bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 3052 size_t hash = Hash(descriptor); 3053 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3054 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3055 it != end && it->first == hash; 3056 ++it) { 3057 mirror::Class* klass = it->second.Read(); 3058 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3059 class_table_.erase(it); 3060 return true; 3061 } 3062 } 3063 return false; 3064} 3065 3066mirror::Class* ClassLinker::LookupClass(const char* descriptor, 3067 const mirror::ClassLoader* class_loader) { 3068 size_t hash = Hash(descriptor); 3069 { 3070 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3071 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3072 if (result != NULL) { 3073 return result; 3074 } 3075 } 3076 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 3077 return NULL; 3078 } else { 3079 // Lookup failed but need to search dex_caches_. 3080 mirror::Class* result = LookupClassFromImage(descriptor); 3081 if (result != NULL) { 3082 InsertClass(descriptor, result, hash); 3083 } else { 3084 // Searching the image dex files/caches failed, we don't want to get into this situation 3085 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3086 // classes into the class table. 3087 const int32_t kMaxFailedDexCacheLookups = 1000; 3088 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3089 MoveImageClassesToClassTable(); 3090 } 3091 } 3092 return result; 3093 } 3094} 3095 3096mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3097 const mirror::ClassLoader* class_loader, 3098 size_t hash) { 3099 auto end = class_table_.end(); 3100 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3101 mirror::Class* klass = it->second.Read(); 3102 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3103 if (kIsDebugBuild) { 3104 // Check for duplicates in the table. 3105 for (++it; it != end && it->first == hash; ++it) { 3106 mirror::Class* klass2 = it->second.Read(); 3107 CHECK(!(klass2->GetClassLoader() == class_loader && 3108 klass2->DescriptorEquals(descriptor))) 3109 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3110 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3111 } 3112 } 3113 return klass; 3114 } 3115 } 3116 return NULL; 3117} 3118 3119static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3120 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3121 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3122 CHECK(image != NULL); 3123 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3124 return root->AsObjectArray<mirror::DexCache>(); 3125} 3126 3127void ClassLinker::MoveImageClassesToClassTable() { 3128 Thread* self = Thread::Current(); 3129 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3130 if (!dex_cache_image_class_lookup_required_) { 3131 return; // All dex cache classes are already in the class table. 3132 } 3133 const char* old_no_suspend_cause = 3134 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 3135 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3136 std::string temp; 3137 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3138 mirror::DexCache* dex_cache = dex_caches->Get(i); 3139 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3140 for (int32_t j = 0; j < types->GetLength(); j++) { 3141 mirror::Class* klass = types->Get(j); 3142 if (klass != NULL) { 3143 DCHECK(klass->GetClassLoader() == NULL); 3144 const char* descriptor = klass->GetDescriptor(&temp); 3145 size_t hash = Hash(descriptor); 3146 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 3147 if (existing != NULL) { 3148 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3149 << PrettyClassAndClassLoader(klass); 3150 } else { 3151 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3152 if (log_new_class_table_roots_) { 3153 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3154 } 3155 } 3156 } 3157 } 3158 } 3159 dex_cache_image_class_lookup_required_ = false; 3160 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3161} 3162 3163mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3164 Thread* self = Thread::Current(); 3165 const char* old_no_suspend_cause = 3166 self->StartAssertNoThreadSuspension("Image class lookup"); 3167 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3168 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3169 mirror::DexCache* dex_cache = dex_caches->Get(i); 3170 const DexFile* dex_file = dex_cache->GetDexFile(); 3171 // Try binary searching the string/type index. 3172 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3173 if (string_id != NULL) { 3174 const DexFile::TypeId* type_id = 3175 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3176 if (type_id != NULL) { 3177 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3178 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3179 if (klass != NULL) { 3180 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3181 return klass; 3182 } 3183 } 3184 } 3185 } 3186 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3187 return NULL; 3188} 3189 3190void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3191 result.clear(); 3192 if (dex_cache_image_class_lookup_required_) { 3193 MoveImageClassesToClassTable(); 3194 } 3195 size_t hash = Hash(descriptor); 3196 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3197 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3198 it != end && it->first == hash; ++it) { 3199 mirror::Class* klass = it->second.Read(); 3200 if (klass->DescriptorEquals(descriptor)) { 3201 result.push_back(klass); 3202 } 3203 } 3204} 3205 3206void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 3207 // TODO: assert that the monitor on the Class is held 3208 Thread* self = Thread::Current(); 3209 ObjectLock<mirror::Class> lock(self, klass); 3210 3211 // Don't attempt to re-verify if already sufficiently verified. 3212 if (klass->IsVerified() || 3213 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 3214 return; 3215 } 3216 3217 // The class might already be erroneous, for example at compile time if we attempted to verify 3218 // this class as a parent to another. 3219 if (klass->IsErroneous()) { 3220 ThrowEarlierClassFailure(klass.Get()); 3221 return; 3222 } 3223 3224 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3225 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3226 } else { 3227 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3228 << PrettyClass(klass.Get()); 3229 CHECK(!Runtime::Current()->IsCompiler()); 3230 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3231 } 3232 3233 // Skip verification if disabled. 3234 if (!Runtime::Current()->IsVerificationEnabled()) { 3235 klass->SetStatus(mirror::Class::kStatusVerified, self); 3236 return; 3237 } 3238 3239 // Verify super class. 3240 StackHandleScope<2> hs(self); 3241 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3242 if (super.Get() != NULL) { 3243 // Acquire lock to prevent races on verifying the super class. 3244 ObjectLock<mirror::Class> lock(self, super); 3245 3246 if (!super->IsVerified() && !super->IsErroneous()) { 3247 VerifyClass(super); 3248 } 3249 if (!super->IsCompileTimeVerified()) { 3250 std::string error_msg( 3251 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3252 PrettyDescriptor(klass.Get()).c_str(), 3253 PrettyDescriptor(super.Get()).c_str())); 3254 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3255 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3256 if (cause.Get() != nullptr) { 3257 self->ClearException(); 3258 } 3259 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3260 if (cause.Get() != nullptr) { 3261 self->GetException(nullptr)->SetCause(cause.Get()); 3262 } 3263 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3264 if (Runtime::Current()->IsCompiler()) { 3265 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3266 } 3267 klass->SetStatus(mirror::Class::kStatusError, self); 3268 return; 3269 } 3270 } 3271 3272 // Try to use verification information from the oat file, otherwise do runtime verification. 3273 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3274 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3275 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3276 if (oat_file_class_status == mirror::Class::kStatusError) { 3277 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3278 << PrettyDescriptor(klass.Get()) << " in " 3279 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3280 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3281 PrettyDescriptor(klass.Get()).c_str()); 3282 klass->SetStatus(mirror::Class::kStatusError, self); 3283 return; 3284 } 3285 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3286 std::string error_msg; 3287 if (!preverified) { 3288 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 3289 Runtime::Current()->IsCompiler(), 3290 &error_msg); 3291 } 3292 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3293 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3294 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3295 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3296 << " because: " << error_msg; 3297 } 3298 self->AssertNoPendingException(); 3299 // Make sure all classes referenced by catch blocks are resolved. 3300 ResolveClassExceptionHandlerTypes(dex_file, klass); 3301 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3302 // Even though there were no verifier failures we need to respect whether the super-class 3303 // was verified or requiring runtime reverification. 3304 if (super.Get() == NULL || super->IsVerified()) { 3305 klass->SetStatus(mirror::Class::kStatusVerified, self); 3306 } else { 3307 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3308 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3309 // Pretend a soft failure occured so that we don't consider the class verified below. 3310 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3311 } 3312 } else { 3313 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3314 // Soft failures at compile time should be retried at runtime. Soft 3315 // failures at runtime will be handled by slow paths in the generated 3316 // code. Set status accordingly. 3317 if (Runtime::Current()->IsCompiler()) { 3318 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3319 } else { 3320 klass->SetStatus(mirror::Class::kStatusVerified, self); 3321 } 3322 } 3323 } else { 3324 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3325 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3326 << " because: " << error_msg; 3327 self->AssertNoPendingException(); 3328 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3329 klass->SetStatus(mirror::Class::kStatusError, self); 3330 } 3331 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3332 // Class is verified so we don't need to do any access check on its methods. 3333 // Let the interpreter know it by setting the kAccPreverified flag onto each 3334 // method. 3335 // Note: we're going here during compilation and at runtime. When we set the 3336 // kAccPreverified flag when compiling image classes, the flag is recorded 3337 // in the image and is set when loading the image. 3338 klass->SetPreverifiedFlagOnAllMethods(); 3339 } 3340} 3341 3342bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3343 mirror::Class::Status& oat_file_class_status) { 3344 // If we're compiling, we can only verify the class using the oat file if 3345 // we are not compiling the image or if the class we're verifying is not part of 3346 // the app. In other words, we will only check for preverification of bootclasspath 3347 // classes. 3348 if (Runtime::Current()->IsCompiler()) { 3349 // Are we compiling the bootclasspath? 3350 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3351 return false; 3352 } 3353 // We are compiling an app (not the image). 3354 3355 // Is this an app class? (I.e. not a bootclasspath class) 3356 if (klass->GetClassLoader() != NULL) { 3357 return false; 3358 } 3359 } 3360 3361 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 3362 // Make this work with gtests, which do not set up the image properly. 3363 // TODO: we should clean up gtests to set up the image path properly. 3364 if (Runtime::Current()->IsCompiler() || (oat_file == NULL)) { 3365 return false; 3366 } 3367 3368 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3369 uint dex_location_checksum = dex_file.GetLocationChecksum(); 3370 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 3371 &dex_location_checksum); 3372 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3373 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3374 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3375 if (oat_file_class_status == mirror::Class::kStatusVerified || 3376 oat_file_class_status == mirror::Class::kStatusInitialized) { 3377 return true; 3378 } 3379 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3380 // Compile time verification failed with a soft error. Compile time verification can fail 3381 // because we have incomplete type information. Consider the following: 3382 // class ... { 3383 // Foo x; 3384 // .... () { 3385 // if (...) { 3386 // v1 gets assigned a type of resolved class Foo 3387 // } else { 3388 // v1 gets assigned a type of unresolved class Bar 3389 // } 3390 // iput x = v1 3391 // } } 3392 // when we merge v1 following the if-the-else it results in Conflict 3393 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3394 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3395 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3396 // at compile time). 3397 return false; 3398 } 3399 if (oat_file_class_status == mirror::Class::kStatusError) { 3400 // Compile time verification failed with a hard error. This is caused by invalid instructions 3401 // in the class. These errors are unrecoverable. 3402 return false; 3403 } 3404 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3405 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3406 // not loading the class. 3407 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3408 // isn't a problem and this case shouldn't occur 3409 return false; 3410 } 3411 std::string temp; 3412 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3413 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3414 << klass->GetDescriptor(&temp); 3415 3416 return false; 3417} 3418 3419void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3420 Handle<mirror::Class> klass) { 3421 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3422 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3423 } 3424 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3425 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3426 } 3427} 3428 3429void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3430 mirror::ArtMethod* method) { 3431 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3432 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3433 if (code_item == NULL) { 3434 return; // native or abstract method 3435 } 3436 if (code_item->tries_size_ == 0) { 3437 return; // nothing to process 3438 } 3439 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3440 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3441 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3442 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3443 CatchHandlerIterator iterator(handlers_ptr); 3444 for (; iterator.HasNext(); iterator.Next()) { 3445 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3446 // unresolved exception types will be ignored by exception delivery 3447 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3448 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3449 if (exception_type == NULL) { 3450 DCHECK(Thread::Current()->IsExceptionPending()); 3451 Thread::Current()->ClearException(); 3452 } 3453 } 3454 } 3455 handlers_ptr = iterator.EndDataPointer(); 3456 } 3457} 3458 3459static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3460static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3461 Handle<mirror::ArtMethod> prototype); 3462 3463mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3464 jobjectArray interfaces, jobject loader, 3465 jobjectArray methods, jobjectArray throws) { 3466 Thread* self = soa.Self(); 3467 StackHandleScope<8> hs(self); 3468 Handle<mirror::Class> klass(hs.NewHandle( 3469 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3470 if (klass.Get() == NULL) { 3471 CHECK(self->IsExceptionPending()); // OOME. 3472 return NULL; 3473 } 3474 DCHECK(klass->GetClass() != NULL); 3475 klass->SetObjectSize(sizeof(mirror::Proxy)); 3476 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 3477 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3478 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3479 klass->SetName(soa.Decode<mirror::String*>(name)); 3480 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3481 klass->SetDexCache(proxy_class->GetDexCache()); 3482 klass->SetStatus(mirror::Class::kStatusIdx, self); 3483 3484 // Instance fields are inherited, but we add a couple of static fields... 3485 { 3486 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3487 if (UNLIKELY(sfields == NULL)) { 3488 CHECK(self->IsExceptionPending()); // OOME. 3489 return NULL; 3490 } 3491 klass->SetSFields(sfields); 3492 } 3493 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3494 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3495 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3496 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3497 CHECK(self->IsExceptionPending()); // OOME. 3498 return nullptr; 3499 } 3500 klass->SetStaticField(0, interfaces_sfield.Get()); 3501 interfaces_sfield->SetDexFieldIndex(0); 3502 interfaces_sfield->SetDeclaringClass(klass.Get()); 3503 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3504 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3505 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3506 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3507 CHECK(self->IsExceptionPending()); // OOME. 3508 return nullptr; 3509 } 3510 klass->SetStaticField(1, throws_sfield.Get()); 3511 throws_sfield->SetDexFieldIndex(1); 3512 throws_sfield->SetDeclaringClass(klass.Get()); 3513 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3514 3515 // Proxies have 1 direct method, the constructor 3516 { 3517 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3518 if (UNLIKELY(directs == nullptr)) { 3519 CHECK(self->IsExceptionPending()); // OOME. 3520 return nullptr; 3521 } 3522 klass->SetDirectMethods(directs); 3523 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3524 if (UNLIKELY(constructor == nullptr)) { 3525 CHECK(self->IsExceptionPending()); // OOME. 3526 return nullptr; 3527 } 3528 klass->SetDirectMethod(0, constructor); 3529 } 3530 3531 // Create virtual method using specified prototypes. 3532 size_t num_virtual_methods = 3533 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3534 { 3535 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3536 num_virtual_methods); 3537 if (UNLIKELY(virtuals == NULL)) { 3538 CHECK(self->IsExceptionPending()); // OOME. 3539 return NULL; 3540 } 3541 klass->SetVirtualMethods(virtuals); 3542 } 3543 for (size_t i = 0; i < num_virtual_methods; ++i) { 3544 StackHandleScope<1> hs(self); 3545 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3546 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3547 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3548 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3549 if (UNLIKELY(clone == nullptr)) { 3550 CHECK(self->IsExceptionPending()); // OOME. 3551 return nullptr; 3552 } 3553 klass->SetVirtualMethod(i, clone); 3554 } 3555 3556 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3557 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3558 self->AssertNoPendingException(); 3559 3560 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3561 mirror::Class* new_class = nullptr; 3562 { 3563 ObjectLock<mirror::Class> resolution_lock(self, klass); // Must hold lock on object when resolved. 3564 // Link the fields and virtual methods, creating vtable and iftables 3565 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3566 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3567 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3568 klass->SetStatus(mirror::Class::kStatusError, self); 3569 return nullptr; 3570 } 3571 } 3572 3573 CHECK(klass->IsRetired()); 3574 CHECK_NE(klass.Get(), new_class); 3575 klass.Assign(new_class); 3576 3577 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3578 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3579 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3580 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3581 3582 { 3583 // Lock on klass is released. Lock new class object. 3584 ObjectLock<mirror::Class> initialization_lock(self, klass); 3585 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3586 } 3587 3588 // sanity checks 3589 if (kIsDebugBuild) { 3590 CHECK(klass->GetIFields() == nullptr); 3591 CheckProxyConstructor(klass->GetDirectMethod(0)); 3592 for (size_t i = 0; i < num_virtual_methods; ++i) { 3593 StackHandleScope<2> hs(self); 3594 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3595 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3596 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3597 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3598 CheckProxyMethod(virtual_method, prototype); 3599 } 3600 3601 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3602 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3603 decoded_name->ToModifiedUtf8().c_str())); 3604 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3605 3606 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3607 decoded_name->ToModifiedUtf8().c_str())); 3608 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3609 3610 CHECK_EQ(klass.Get()->GetInterfaces(), 3611 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3612 CHECK_EQ(klass.Get()->GetThrows(), 3613 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3614 } 3615 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3616 CHECK(existing == nullptr); 3617 return klass.Get(); 3618} 3619 3620std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3621 DCHECK(proxy_class->IsProxyClass()); 3622 mirror::String* name = proxy_class->GetName(); 3623 DCHECK(name != NULL); 3624 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3625} 3626 3627mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3628 mirror::ArtMethod* proxy_method) { 3629 DCHECK(proxy_class->IsProxyClass()); 3630 DCHECK(proxy_method->IsProxyMethod()); 3631 // Locate the dex cache of the original interface/Object 3632 mirror::DexCache* dex_cache = nullptr; 3633 { 3634 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3635 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3636 mirror::DexCache* a_dex_cache = GetDexCache(i); 3637 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3638 dex_cache = a_dex_cache; 3639 break; 3640 } 3641 } 3642 } 3643 CHECK(dex_cache != nullptr); 3644 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3645 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3646 CHECK(resolved_method != nullptr); 3647 return resolved_method; 3648} 3649 3650 3651mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3652 Handle<mirror::Class> klass, 3653 mirror::Class* proxy_class) { 3654 // Create constructor for Proxy that must initialize h 3655 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3656 proxy_class->GetDirectMethods(); 3657 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3658 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3659 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 3660 // constructor method. 3661 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 3662 proxy_constructor); 3663 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3664 // code_ too) 3665 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3666 if (constructor == nullptr) { 3667 CHECK(self->IsExceptionPending()); // OOME. 3668 return nullptr; 3669 } 3670 // Make this constructor public and fix the class to be our Proxy version 3671 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3672 constructor->SetDeclaringClass(klass.Get()); 3673 return constructor; 3674} 3675 3676static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3677 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3678 CHECK(constructor->IsConstructor()); 3679 CHECK_STREQ(constructor->GetName(), "<init>"); 3680 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3681 "(Ljava/lang/reflect/InvocationHandler;)V"); 3682 DCHECK(constructor->IsPublic()); 3683} 3684 3685mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3686 Handle<mirror::Class> klass, 3687 Handle<mirror::ArtMethod> prototype) { 3688 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3689 // prototype method 3690 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3691 prototype.Get()); 3692 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3693 // as necessary 3694 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3695 if (UNLIKELY(method == NULL)) { 3696 CHECK(self->IsExceptionPending()); // OOME. 3697 return NULL; 3698 } 3699 3700 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3701 // the intersection of throw exceptions as defined in Proxy 3702 method->SetDeclaringClass(klass.Get()); 3703 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3704 3705 // At runtime the method looks like a reference and argument saving method, clone the code 3706 // related parameters from this method. 3707 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3708 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3709 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3710 3711 return method; 3712} 3713 3714static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3715 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3716 // Basic sanity 3717 CHECK(!prototype->IsFinal()); 3718 CHECK(method->IsFinal()); 3719 CHECK(!method->IsAbstract()); 3720 3721 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3722 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3723 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3724 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 3725 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 3726 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3727 3728 MethodHelper mh(method); 3729 MethodHelper mh2(prototype); 3730 CHECK_STREQ(method->GetName(), prototype->GetName()); 3731 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3732 // More complex sanity - via dex cache 3733 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3734} 3735 3736static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3737 bool can_init_parents) 3738 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3739 if (can_init_statics && can_init_parents) { 3740 return true; 3741 } 3742 if (!can_init_statics) { 3743 // Check if there's a class initializer. 3744 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3745 if (clinit != NULL) { 3746 return false; 3747 } 3748 // Check if there are encoded static values needing initialization. 3749 if (klass->NumStaticFields() != 0) { 3750 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3751 DCHECK(dex_class_def != NULL); 3752 if (dex_class_def->static_values_off_ != 0) { 3753 return false; 3754 } 3755 } 3756 } 3757 if (!klass->IsInterface() && klass->HasSuperClass()) { 3758 mirror::Class* super_class = klass->GetSuperClass(); 3759 if (!can_init_parents && !super_class->IsInitialized()) { 3760 return false; 3761 } else { 3762 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3763 return false; 3764 } 3765 } 3766 } 3767 return true; 3768} 3769 3770bool ClassLinker::IsInitialized() const { 3771 return init_done_; 3772} 3773 3774bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3775 bool can_init_parents) { 3776 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3777 3778 // Are we already initialized and therefore done? 3779 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3780 // an initialized class will never change its state. 3781 if (klass->IsInitialized()) { 3782 return true; 3783 } 3784 3785 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3786 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3787 return false; 3788 } 3789 3790 Thread* self = Thread::Current(); 3791 uint64_t t0; 3792 { 3793 ObjectLock<mirror::Class> lock(self, klass); 3794 3795 // Re-check under the lock in case another thread initialized ahead of us. 3796 if (klass->IsInitialized()) { 3797 return true; 3798 } 3799 3800 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3801 if (klass->IsErroneous()) { 3802 ThrowEarlierClassFailure(klass.Get()); 3803 return false; 3804 } 3805 3806 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3807 3808 if (!klass->IsVerified()) { 3809 VerifyClass(klass); 3810 if (!klass->IsVerified()) { 3811 // We failed to verify, expect either the klass to be erroneous or verification failed at 3812 // compile time. 3813 if (klass->IsErroneous()) { 3814 CHECK(self->IsExceptionPending()); 3815 } else { 3816 CHECK(Runtime::Current()->IsCompiler()); 3817 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3818 } 3819 return false; 3820 } else { 3821 self->AssertNoPendingException(); 3822 } 3823 } 3824 3825 // If the class is kStatusInitializing, either this thread is 3826 // initializing higher up the stack or another thread has beat us 3827 // to initializing and we need to wait. Either way, this 3828 // invocation of InitializeClass will not be responsible for 3829 // running <clinit> and will return. 3830 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3831 // Could have got an exception during verification. 3832 if (self->IsExceptionPending()) { 3833 return false; 3834 } 3835 // We caught somebody else in the act; was it us? 3836 if (klass->GetClinitThreadId() == self->GetTid()) { 3837 // Yes. That's fine. Return so we can continue initializing. 3838 return true; 3839 } 3840 // No. That's fine. Wait for another thread to finish initializing. 3841 return WaitForInitializeClass(klass, self, lock); 3842 } 3843 3844 if (!ValidateSuperClassDescriptors(klass)) { 3845 klass->SetStatus(mirror::Class::kStatusError, self); 3846 return false; 3847 } 3848 3849 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3850 3851 // From here out other threads may observe that we're initializing and so changes of state 3852 // require the a notification. 3853 klass->SetClinitThreadId(self->GetTid()); 3854 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3855 3856 t0 = NanoTime(); 3857 } 3858 3859 // Initialize super classes, must be done while initializing for the JLS. 3860 if (!klass->IsInterface() && klass->HasSuperClass()) { 3861 mirror::Class* super_class = klass->GetSuperClass(); 3862 if (!super_class->IsInitialized()) { 3863 CHECK(!super_class->IsInterface()); 3864 CHECK(can_init_parents); 3865 StackHandleScope<1> hs(self); 3866 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3867 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3868 if (!super_initialized) { 3869 // The super class was verified ahead of entering initializing, we should only be here if 3870 // the super class became erroneous due to initialization. 3871 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3872 << "Super class initialization failed for " 3873 << PrettyDescriptor(handle_scope_super.Get()) 3874 << " that has unexpected status " << handle_scope_super->GetStatus() 3875 << "\nPending exception:\n" 3876 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3877 ObjectLock<mirror::Class> lock(self, klass); 3878 // Initialization failed because the super-class is erroneous. 3879 klass->SetStatus(mirror::Class::kStatusError, self); 3880 return false; 3881 } 3882 } 3883 } 3884 3885 if (klass->NumStaticFields() > 0) { 3886 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3887 CHECK(dex_class_def != NULL); 3888 const DexFile& dex_file = klass->GetDexFile(); 3889 StackHandleScope<2> hs(self); 3890 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3891 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3892 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3893 this, *dex_class_def); 3894 if (it.HasNext()) { 3895 CHECK(can_init_statics); 3896 // We reordered the fields, so we need to be able to map the 3897 // field indexes to the right fields. 3898 SafeMap<uint32_t, mirror::ArtField*> field_map; 3899 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3900 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3901 if (Runtime::Current()->IsActiveTransaction()) { 3902 it.ReadValueToField<true>(field_map.Get(i)); 3903 } else { 3904 it.ReadValueToField<false>(field_map.Get(i)); 3905 } 3906 } 3907 } 3908 } 3909 3910 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3911 if (clinit != NULL) { 3912 CHECK(can_init_statics); 3913 JValue result; 3914 clinit->Invoke(self, NULL, 0, &result, "V"); 3915 } 3916 3917 uint64_t t1 = NanoTime(); 3918 3919 bool success = true; 3920 { 3921 ObjectLock<mirror::Class> lock(self, klass); 3922 3923 if (self->IsExceptionPending()) { 3924 WrapExceptionInInitializer(); 3925 klass->SetStatus(mirror::Class::kStatusError, self); 3926 success = false; 3927 } else { 3928 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3929 RuntimeStats* thread_stats = self->GetStats(); 3930 ++global_stats->class_init_count; 3931 ++thread_stats->class_init_count; 3932 global_stats->class_init_time_ns += (t1 - t0); 3933 thread_stats->class_init_time_ns += (t1 - t0); 3934 // Set the class as initialized except if failed to initialize static fields. 3935 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3936 if (VLOG_IS_ON(class_linker)) { 3937 std::string temp; 3938 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 3939 klass->GetLocation(); 3940 } 3941 // Opportunistically set static method trampolines to their destination. 3942 FixupStaticTrampolines(klass.Get()); 3943 } 3944 } 3945 return success; 3946} 3947 3948bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3949 ObjectLock<mirror::Class>& lock) 3950 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3951 while (true) { 3952 self->AssertNoPendingException(); 3953 CHECK(!klass->IsInitialized()); 3954 lock.WaitIgnoringInterrupts(); 3955 3956 // When we wake up, repeat the test for init-in-progress. If 3957 // there's an exception pending (only possible if 3958 // "interruptShouldThrow" was set), bail out. 3959 if (self->IsExceptionPending()) { 3960 WrapExceptionInInitializer(); 3961 klass->SetStatus(mirror::Class::kStatusError, self); 3962 return false; 3963 } 3964 // Spurious wakeup? Go back to waiting. 3965 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3966 continue; 3967 } 3968 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3969 // Compile time initialization failed. 3970 return false; 3971 } 3972 if (klass->IsErroneous()) { 3973 // The caller wants an exception, but it was thrown in a 3974 // different thread. Synthesize one here. 3975 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3976 PrettyDescriptor(klass.Get()).c_str()); 3977 return false; 3978 } 3979 if (klass->IsInitialized()) { 3980 return true; 3981 } 3982 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 3983 << klass->GetStatus(); 3984 } 3985 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 3986} 3987 3988bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 3989 if (klass->IsInterface()) { 3990 return true; 3991 } 3992 // Begin with the methods local to the superclass. 3993 StackHandleScope<2> hs(Thread::Current()); 3994 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3995 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3996 if (klass->HasSuperClass() && 3997 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3998 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 3999 mh.ChangeMethod(klass->GetVTableEntry(i)); 4000 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 4001 if (mh.GetMethod() != super_mh.GetMethod() && 4002 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4003 ThrowLinkageError(klass.Get(), 4004 "Class %s method %s resolves differently in superclass %s", 4005 PrettyDescriptor(klass.Get()).c_str(), 4006 PrettyMethod(mh.GetMethod()).c_str(), 4007 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4008 return false; 4009 } 4010 } 4011 } 4012 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4013 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4014 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4015 for (uint32_t j = 0; j < num_methods; ++j) { 4016 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4017 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4018 if (mh.GetMethod() != super_mh.GetMethod() && 4019 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4020 ThrowLinkageError(klass.Get(), 4021 "Class %s method %s resolves differently in interface %s", 4022 PrettyDescriptor(klass.Get()).c_str(), 4023 PrettyMethod(mh.GetMethod()).c_str(), 4024 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4025 return false; 4026 } 4027 } 4028 } 4029 } 4030 return true; 4031} 4032 4033bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 4034 bool can_init_parents) { 4035 DCHECK(c.Get() != nullptr); 4036 if (c->IsInitialized()) { 4037 return true; 4038 } 4039 const bool success = InitializeClass(c, can_init_fields, can_init_parents); 4040 Thread* self = Thread::Current(); 4041 if (!success) { 4042 if (can_init_fields && can_init_parents) { 4043 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4044 } 4045 } else { 4046 self->AssertNoPendingException(); 4047 } 4048 return success; 4049} 4050 4051void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 4052 mirror::Class* c, 4053 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 4054 const byte* class_data = dex_file.GetClassData(dex_class_def); 4055 ClassDataItemIterator it(dex_file, class_data); 4056 StackHandleScope<2> hs(Thread::Current()); 4057 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 4058 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 4059 CHECK(!kMovingFields); 4060 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 4061 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 4062 } 4063} 4064 4065void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4066 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4067 if (fields != nullptr) { 4068 for (int index = 0; index < fields->GetLength(); index ++) { 4069 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4070 fields->Get(index)->SetDeclaringClass(new_class); 4071 } 4072 } 4073 } 4074 4075 fields = new_class->GetSFields(); 4076 if (fields != nullptr) { 4077 for (int index = 0; index < fields->GetLength(); index ++) { 4078 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4079 fields->Get(index)->SetDeclaringClass(new_class); 4080 } 4081 } 4082 } 4083 4084 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4085 if (methods != nullptr) { 4086 for (int index = 0; index < methods->GetLength(); index ++) { 4087 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4088 methods->Get(index)->SetDeclaringClass(new_class); 4089 } 4090 } 4091 } 4092 4093 methods = new_class->GetVirtualMethods(); 4094 if (methods != nullptr) { 4095 for (int index = 0; index < methods->GetLength(); index ++) { 4096 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4097 methods->Get(index)->SetDeclaringClass(new_class); 4098 } 4099 } 4100 } 4101} 4102 4103bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4104 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4105 mirror::Class** new_class) { 4106 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4107 4108 if (!LinkSuperClass(klass)) { 4109 return false; 4110 } 4111 if (!LinkMethods(self, klass, interfaces)) { 4112 return false; 4113 } 4114 if (!LinkInstanceFields(klass)) { 4115 return false; 4116 } 4117 size_t class_size; 4118 if (!LinkStaticFields(klass, &class_size)) { 4119 return false; 4120 } 4121 CreateReferenceInstanceOffsets(klass); 4122 CreateReferenceStaticOffsets(klass); 4123 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4124 4125 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4126 // We don't need to retire this class as it has no embedded tables or it was created the 4127 // correct size during class linker initialization. 4128 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4129 4130 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4131 klass->PopulateEmbeddedImtAndVTable(); 4132 } 4133 4134 // This will notify waiters on klass that saw the not yet resolved 4135 // class in the class_table_ during EnsureResolved. 4136 klass->SetStatus(mirror::Class::kStatusResolved, self); 4137 *new_class = klass.Get(); 4138 } else { 4139 CHECK(!klass->IsResolved()); 4140 // Retire the temporary class and create the correctly sized resolved class. 4141 *new_class = klass->CopyOf(self, class_size); 4142 if (UNLIKELY(*new_class == NULL)) { 4143 CHECK(self->IsExceptionPending()); // Expect an OOME. 4144 klass->SetStatus(mirror::Class::kStatusError, self); 4145 return false; 4146 } 4147 4148 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4149 StackHandleScope<1> hs(self); 4150 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4151 ObjectLock<mirror::Class> lock(self, new_class_h); 4152 4153 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4154 4155 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4156 CHECK(existing == NULL || existing == klass.Get()); 4157 4158 // This will notify waiters on temp class that saw the not yet resolved class in the 4159 // class_table_ during EnsureResolved. 4160 klass->SetStatus(mirror::Class::kStatusRetired, self); 4161 4162 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4163 // This will notify waiters on new_class that saw the not yet resolved 4164 // class in the class_table_ during EnsureResolved. 4165 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4166 } 4167 return true; 4168} 4169 4170bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4171 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4172 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4173 uint16_t super_class_idx = class_def.superclass_idx_; 4174 if (super_class_idx != DexFile::kDexNoIndex16) { 4175 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4176 if (super_class == NULL) { 4177 DCHECK(Thread::Current()->IsExceptionPending()); 4178 return false; 4179 } 4180 // Verify 4181 if (!klass->CanAccess(super_class)) { 4182 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4183 PrettyDescriptor(super_class).c_str(), 4184 PrettyDescriptor(klass.Get()).c_str()); 4185 return false; 4186 } 4187 CHECK(super_class->IsResolved()); 4188 klass->SetSuperClass(super_class); 4189 } 4190 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4191 if (interfaces != NULL) { 4192 for (size_t i = 0; i < interfaces->Size(); i++) { 4193 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4194 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4195 if (interface == NULL) { 4196 DCHECK(Thread::Current()->IsExceptionPending()); 4197 return false; 4198 } 4199 // Verify 4200 if (!klass->CanAccess(interface)) { 4201 // TODO: the RI seemed to ignore this in my testing. 4202 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4203 PrettyDescriptor(interface).c_str(), 4204 PrettyDescriptor(klass.Get()).c_str()); 4205 return false; 4206 } 4207 } 4208 } 4209 // Mark the class as loaded. 4210 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 4211 return true; 4212} 4213 4214bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4215 CHECK(!klass->IsPrimitive()); 4216 mirror::Class* super = klass->GetSuperClass(); 4217 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4218 if (super != NULL) { 4219 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4220 return false; 4221 } 4222 return true; 4223 } 4224 if (super == NULL) { 4225 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4226 PrettyDescriptor(klass.Get()).c_str()); 4227 return false; 4228 } 4229 // Verify 4230 if (super->IsFinal() || super->IsInterface()) { 4231 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4232 PrettyDescriptor(super).c_str(), 4233 PrettyDescriptor(klass.Get()).c_str(), 4234 super->IsFinal() ? "declared final" : "an interface"); 4235 return false; 4236 } 4237 if (!klass->CanAccess(super)) { 4238 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4239 PrettyDescriptor(super).c_str(), 4240 PrettyDescriptor(klass.Get()).c_str()); 4241 return false; 4242 } 4243 4244 // Inherit kAccClassIsFinalizable from the superclass in case this 4245 // class doesn't override finalize. 4246 if (super->IsFinalizable()) { 4247 klass->SetFinalizable(); 4248 } 4249 4250 // Inherit reference flags (if any) from the superclass. 4251 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4252 if (reference_flags != 0) { 4253 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4254 } 4255 // Disallow custom direct subclasses of java.lang.ref.Reference. 4256 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4257 ThrowLinkageError(klass.Get(), 4258 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4259 PrettyDescriptor(klass.Get()).c_str()); 4260 return false; 4261 } 4262 4263 if (kIsDebugBuild) { 4264 // Ensure super classes are fully resolved prior to resolving fields.. 4265 while (super != NULL) { 4266 CHECK(super->IsResolved()); 4267 super = super->GetSuperClass(); 4268 } 4269 } 4270 return true; 4271} 4272 4273// Populate the class vtable and itable. Compute return type indices. 4274bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4275 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4276 if (klass->IsInterface()) { 4277 // No vtable. 4278 size_t count = klass->NumVirtualMethods(); 4279 if (!IsUint(16, count)) { 4280 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4281 return false; 4282 } 4283 for (size_t i = 0; i < count; ++i) { 4284 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4285 } 4286 // Link interface method tables 4287 return LinkInterfaceMethods(klass, interfaces); 4288 } else { 4289 // Link virtual and interface method tables 4290 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4291 } 4292 return true; 4293} 4294 4295bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4296 if (klass->HasSuperClass()) { 4297 uint32_t max_count = klass->NumVirtualMethods() + 4298 klass->GetSuperClass()->GetVTableLength(); 4299 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4300 CHECK_LE(actual_count, max_count); 4301 StackHandleScope<4> hs(self); 4302 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4303 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4304 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4305 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4306 if (UNLIKELY(vtable.Get() == nullptr)) { 4307 CHECK(self->IsExceptionPending()); // OOME. 4308 return false; 4309 } 4310 int len = super_class->GetVTableLength(); 4311 for (int i = 0; i < len; i++) { 4312 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4313 } 4314 } else { 4315 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4316 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4317 if (UNLIKELY(vtable.Get() == nullptr)) { 4318 CHECK(self->IsExceptionPending()); // OOME. 4319 return false; 4320 } 4321 } 4322 4323 // See if any of our virtual methods override the superclass. 4324 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4325 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4326 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4327 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4328 local_mh.ChangeMethod(local_method); 4329 size_t j = 0; 4330 for (; j < actual_count; ++j) { 4331 mirror::ArtMethod* super_method = vtable->Get(j); 4332 super_mh.ChangeMethod(super_method); 4333 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4334 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4335 super_method->GetAccessFlags())) { 4336 if (super_method->IsFinal()) { 4337 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4338 PrettyMethod(local_method).c_str(), 4339 super_method->GetDeclaringClassDescriptor()); 4340 return false; 4341 } 4342 vtable->Set<false>(j, local_method); 4343 local_method->SetMethodIndex(j); 4344 break; 4345 } else { 4346 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4347 << " would have incorrectly overridden the package-private method in " 4348 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4349 } 4350 } 4351 } 4352 if (j == actual_count) { 4353 // Not overriding, append. 4354 vtable->Set<false>(actual_count, local_method); 4355 local_method->SetMethodIndex(actual_count); 4356 actual_count += 1; 4357 } 4358 } 4359 if (!IsUint(16, actual_count)) { 4360 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4361 return false; 4362 } 4363 // Shrink vtable if possible 4364 CHECK_LE(actual_count, max_count); 4365 if (actual_count < max_count) { 4366 vtable.Assign(vtable->CopyOf(self, actual_count)); 4367 if (UNLIKELY(vtable.Get() == NULL)) { 4368 CHECK(self->IsExceptionPending()); // OOME. 4369 return false; 4370 } 4371 } 4372 klass->SetVTable(vtable.Get()); 4373 } else { 4374 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4375 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4376 if (!IsUint(16, num_virtual_methods)) { 4377 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4378 return false; 4379 } 4380 StackHandleScope<1> hs(self); 4381 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4382 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4383 if (UNLIKELY(vtable.Get() == NULL)) { 4384 CHECK(self->IsExceptionPending()); // OOME. 4385 return false; 4386 } 4387 for (size_t i = 0; i < num_virtual_methods; ++i) { 4388 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4389 vtable->Set<false>(i, virtual_method); 4390 virtual_method->SetMethodIndex(i & 0xFFFF); 4391 } 4392 klass->SetVTable(vtable.Get()); 4393 } 4394 return true; 4395} 4396 4397bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 4398 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4399 Thread* const self = Thread::Current(); 4400 Runtime* const runtime = Runtime::Current(); 4401 // Set the imt table to be all conflicts by default. 4402 klass->SetImTable(runtime->GetDefaultImt()); 4403 size_t super_ifcount; 4404 if (klass->HasSuperClass()) { 4405 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4406 } else { 4407 super_ifcount = 0; 4408 } 4409 uint32_t num_interfaces = 4410 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4411 size_t ifcount = super_ifcount + num_interfaces; 4412 for (size_t i = 0; i < num_interfaces; i++) { 4413 mirror::Class* interface = 4414 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4415 interfaces->Get(i); 4416 ifcount += interface->GetIfTableCount(); 4417 } 4418 if (ifcount == 0) { 4419 // Class implements no interfaces. 4420 DCHECK_EQ(klass->GetIfTableCount(), 0); 4421 DCHECK(klass->GetIfTable() == NULL); 4422 return true; 4423 } 4424 if (ifcount == super_ifcount) { 4425 // Class implements same interfaces as parent, are any of these not marker interfaces? 4426 bool has_non_marker_interface = false; 4427 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4428 for (size_t i = 0; i < ifcount; ++i) { 4429 if (super_iftable->GetMethodArrayCount(i) > 0) { 4430 has_non_marker_interface = true; 4431 break; 4432 } 4433 } 4434 if (!has_non_marker_interface) { 4435 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4436 klass->SetIfTable(super_iftable); 4437 return true; 4438 } 4439 } 4440 StackHandleScope<4> hs(self); 4441 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4442 if (UNLIKELY(iftable.Get() == NULL)) { 4443 CHECK(self->IsExceptionPending()); // OOME. 4444 return false; 4445 } 4446 if (super_ifcount != 0) { 4447 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4448 for (size_t i = 0; i < super_ifcount; i++) { 4449 mirror::Class* super_interface = super_iftable->GetInterface(i); 4450 iftable->SetInterface(i, super_interface); 4451 } 4452 } 4453 // Flatten the interface inheritance hierarchy. 4454 size_t idx = super_ifcount; 4455 for (size_t i = 0; i < num_interfaces; i++) { 4456 mirror::Class* interface = 4457 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4458 interfaces->Get(i); 4459 DCHECK(interface != NULL); 4460 if (!interface->IsInterface()) { 4461 std::string temp; 4462 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4463 PrettyDescriptor(klass.Get()).c_str(), 4464 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4465 return false; 4466 } 4467 // Check if interface is already in iftable 4468 bool duplicate = false; 4469 for (size_t j = 0; j < idx; j++) { 4470 mirror::Class* existing_interface = iftable->GetInterface(j); 4471 if (existing_interface == interface) { 4472 duplicate = true; 4473 break; 4474 } 4475 } 4476 if (!duplicate) { 4477 // Add this non-duplicate interface. 4478 iftable->SetInterface(idx++, interface); 4479 // Add this interface's non-duplicate super-interfaces. 4480 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4481 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4482 bool super_duplicate = false; 4483 for (size_t k = 0; k < idx; k++) { 4484 mirror::Class* existing_interface = iftable->GetInterface(k); 4485 if (existing_interface == super_interface) { 4486 super_duplicate = true; 4487 break; 4488 } 4489 } 4490 if (!super_duplicate) { 4491 iftable->SetInterface(idx++, super_interface); 4492 } 4493 } 4494 } 4495 } 4496 // Shrink iftable in case duplicates were found 4497 if (idx < ifcount) { 4498 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4499 if (UNLIKELY(iftable.Get() == NULL)) { 4500 CHECK(self->IsExceptionPending()); // OOME. 4501 return false; 4502 } 4503 ifcount = idx; 4504 } else { 4505 CHECK_EQ(idx, ifcount); 4506 } 4507 klass->SetIfTable(iftable.Get()); 4508 4509 // If we're an interface, we don't need the vtable pointers, so we're done. 4510 if (klass->IsInterface()) { 4511 return true; 4512 } 4513 // Allocate imtable 4514 bool imtable_changed = false; 4515 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4516 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4517 if (UNLIKELY(imtable.Get() == NULL)) { 4518 CHECK(self->IsExceptionPending()); // OOME. 4519 return false; 4520 } 4521 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4522 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4523 std::vector<mirror::ArtMethod*> miranda_list; 4524 for (size_t i = 0; i < ifcount; ++i) { 4525 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4526 if (num_methods > 0) { 4527 StackHandleScope<2> hs(self); 4528 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4529 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4530 if (UNLIKELY(method_array.Get() == nullptr)) { 4531 CHECK(self->IsExceptionPending()); // OOME. 4532 return false; 4533 } 4534 iftable->SetMethodArray(i, method_array.Get()); 4535 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4536 hs.NewHandle(klass->GetVTableDuringLinking())); 4537 for (size_t j = 0; j < num_methods; ++j) { 4538 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 4539 interface_mh.ChangeMethod(interface_method); 4540 int32_t k; 4541 // For each method listed in the interface's method list, find the 4542 // matching method in our class's method list. We want to favor the 4543 // subclass over the superclass, which just requires walking 4544 // back from the end of the vtable. (This only matters if the 4545 // superclass defines a private method and this class redefines 4546 // it -- otherwise it would use the same vtable slot. In .dex files 4547 // those don't end up in the virtual method table, so it shouldn't 4548 // matter which direction we go. We walk it backward anyway.) 4549 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4550 mirror::ArtMethod* vtable_method = vtable->Get(k); 4551 vtable_mh.ChangeMethod(vtable_method); 4552 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4553 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 4554 ThrowIllegalAccessError( 4555 klass.Get(), 4556 "Method '%s' implementing interface method '%s' is not public", 4557 PrettyMethod(vtable_method).c_str(), 4558 PrettyMethod(interface_method).c_str()); 4559 return false; 4560 } 4561 method_array->Set<false>(j, vtable_method); 4562 // Place method in imt if entry is empty, place conflict otherwise. 4563 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4564 if (imtable->Get(imt_index) == NULL) { 4565 imtable->Set<false>(imt_index, vtable_method); 4566 imtable_changed = true; 4567 } else { 4568 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4569 } 4570 break; 4571 } 4572 } 4573 if (k < 0) { 4574 StackHandleScope<1> hs(self); 4575 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4576 for (mirror::ArtMethod* mir_method : miranda_list) { 4577 vtable_mh.ChangeMethod(mir_method); 4578 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4579 miranda_method.Assign(mir_method); 4580 break; 4581 } 4582 } 4583 if (miranda_method.Get() == NULL) { 4584 // Point the interface table at a phantom slot. 4585 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 4586 if (UNLIKELY(miranda_method.Get() == NULL)) { 4587 CHECK(self->IsExceptionPending()); // OOME. 4588 return false; 4589 } 4590 // TODO: If a methods move then the miranda_list may hold stale references. 4591 miranda_list.push_back(miranda_method.Get()); 4592 } 4593 method_array->Set<false>(j, miranda_method.Get()); 4594 } 4595 } 4596 } 4597 } 4598 if (imtable_changed) { 4599 // Fill in empty entries in interface method table with conflict. 4600 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4601 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4602 if (imtable->Get(i) == NULL) { 4603 imtable->Set<false>(i, imt_conflict_method); 4604 } 4605 } 4606 klass->SetImTable(imtable.Get()); 4607 } 4608 if (!miranda_list.empty()) { 4609 int old_method_count = klass->NumVirtualMethods(); 4610 int new_method_count = old_method_count + miranda_list.size(); 4611 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4612 if (old_method_count == 0) { 4613 virtuals = AllocArtMethodArray(self, new_method_count); 4614 } else { 4615 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4616 } 4617 if (UNLIKELY(virtuals == NULL)) { 4618 CHECK(self->IsExceptionPending()); // OOME. 4619 return false; 4620 } 4621 klass->SetVirtualMethods(virtuals); 4622 4623 StackHandleScope<1> hs(self); 4624 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4625 hs.NewHandle(klass->GetVTableDuringLinking())); 4626 CHECK(vtable.Get() != NULL); 4627 int old_vtable_count = vtable->GetLength(); 4628 int new_vtable_count = old_vtable_count + miranda_list.size(); 4629 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4630 if (UNLIKELY(vtable.Get() == NULL)) { 4631 CHECK(self->IsExceptionPending()); // OOME. 4632 return false; 4633 } 4634 for (size_t i = 0; i < miranda_list.size(); ++i) { 4635 mirror::ArtMethod* method = miranda_list[i]; 4636 // Leave the declaring class alone as type indices are relative to it 4637 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4638 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4639 klass->SetVirtualMethod(old_method_count + i, method); 4640 vtable->Set<false>(old_vtable_count + i, method); 4641 } 4642 // TODO: do not assign to the vtable field until it is fully constructed. 4643 klass->SetVTable(vtable.Get()); 4644 } 4645 4646 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4647 for (int i = 0; i < vtable->GetLength(); ++i) { 4648 CHECK(vtable->Get(i) != NULL); 4649 } 4650 4651// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4652 4653 return true; 4654} 4655 4656bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4657 CHECK(klass.Get() != NULL); 4658 return LinkFields(klass, false, nullptr); 4659} 4660 4661bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass, size_t* class_size) { 4662 CHECK(klass.Get() != NULL); 4663 return LinkFields(klass, true, class_size); 4664} 4665 4666struct LinkFieldsComparator { 4667 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4668 } 4669 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4670 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4671 NO_THREAD_SAFETY_ANALYSIS { 4672 // First come reference fields, then 64-bit, and finally 32-bit 4673 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4674 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4675 if (type1 != type2) { 4676 bool is_primitive1 = type1 != Primitive::kPrimNot; 4677 bool is_primitive2 = type2 != Primitive::kPrimNot; 4678 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4679 type1 == Primitive::kPrimDouble); 4680 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4681 type2 == Primitive::kPrimDouble); 4682 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4683 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4684 if (order1 != order2) { 4685 return order1 < order2; 4686 } 4687 } 4688 // same basic group? then sort by string. 4689 return strcmp(field1->GetName(), field2->GetName()) < 0; 4690 } 4691}; 4692 4693bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static, size_t* class_size) { 4694 size_t num_fields = 4695 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4696 4697 mirror::ObjectArray<mirror::ArtField>* fields = 4698 is_static ? klass->GetSFields() : klass->GetIFields(); 4699 4700 // Initialize field_offset 4701 MemberOffset field_offset(0); 4702 if (is_static) { 4703 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 4704 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4705 // Static fields come after the embedded tables. 4706 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 4707 0, 0, 0); 4708 } 4709 field_offset = MemberOffset(base); 4710 } else { 4711 mirror::Class* super_class = klass->GetSuperClass(); 4712 if (super_class != NULL) { 4713 CHECK(super_class->IsResolved()) 4714 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4715 field_offset = MemberOffset(super_class->GetObjectSize()); 4716 } 4717 } 4718 4719 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4720 4721 // we want a relatively stable order so that adding new fields 4722 // minimizes disruption of C++ version such as Class and Method. 4723 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4724 for (size_t i = 0; i < num_fields; i++) { 4725 mirror::ArtField* f = fields->Get(i); 4726 CHECK(f != NULL) << PrettyClass(klass.Get()); 4727 grouped_and_sorted_fields.push_back(f); 4728 } 4729 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4730 LinkFieldsComparator()); 4731 4732 // References should be at the front. 4733 size_t current_field = 0; 4734 size_t num_reference_fields = 0; 4735 for (; current_field < num_fields; current_field++) { 4736 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4737 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4738 bool isPrimitive = type != Primitive::kPrimNot; 4739 if (isPrimitive) { 4740 break; // past last reference, move on to the next phase 4741 } 4742 grouped_and_sorted_fields.pop_front(); 4743 num_reference_fields++; 4744 fields->Set<false>(current_field, field); 4745 field->SetOffset(field_offset); 4746 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4747 } 4748 4749 // Now we want to pack all of the double-wide fields together. If 4750 // we're not aligned, though, we want to shuffle one 32-bit field 4751 // into place. If we can't find one, we'll have to pad it. 4752 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4753 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4754 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4755 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4756 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4757 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4758 continue; 4759 } 4760 fields->Set<false>(current_field++, field); 4761 field->SetOffset(field_offset); 4762 // drop the consumed field 4763 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4764 break; 4765 } 4766 // whether we found a 32-bit field for padding or not, we advance 4767 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4768 } 4769 4770 // Alignment is good, shuffle any double-wide fields forward, and 4771 // finish assigning field offsets to all fields. 4772 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 4773 << PrettyClass(klass.Get()); 4774 while (!grouped_and_sorted_fields.empty()) { 4775 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4776 grouped_and_sorted_fields.pop_front(); 4777 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4778 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4779 fields->Set<false>(current_field, field); 4780 field->SetOffset(field_offset); 4781 field_offset = MemberOffset(field_offset.Uint32Value() + 4782 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4783 ? sizeof(uint64_t) 4784 : sizeof(uint32_t))); 4785 current_field++; 4786 } 4787 4788 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4789 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4790 // We know there are no non-reference fields in the Reference classes, and we know 4791 // that 'referent' is alphabetically last, so this is easy... 4792 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4793 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4794 --num_reference_fields; 4795 } 4796 4797 if (kIsDebugBuild) { 4798 // Make sure that all reference fields appear before 4799 // non-reference fields, and all double-wide fields are aligned. 4800 bool seen_non_ref = false; 4801 for (size_t i = 0; i < num_fields; i++) { 4802 mirror::ArtField* field = fields->Get(i); 4803 if (false) { // enable to debug field layout 4804 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4805 << " class=" << PrettyClass(klass.Get()) 4806 << " field=" << PrettyField(field) 4807 << " offset=" 4808 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4809 } 4810 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4811 bool is_primitive = type != Primitive::kPrimNot; 4812 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4813 strcmp("referent", field->GetName()) == 0) { 4814 is_primitive = true; // We lied above, so we have to expect a lie here. 4815 } 4816 if (is_primitive) { 4817 if (!seen_non_ref) { 4818 seen_non_ref = true; 4819 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4820 } 4821 } else { 4822 DCHECK(!seen_non_ref) << PrettyField(field); 4823 } 4824 } 4825 if (!seen_non_ref) { 4826 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4827 } 4828 } 4829 4830 size_t size = field_offset.Uint32Value(); 4831 // Update klass 4832 if (is_static) { 4833 klass->SetNumReferenceStaticFields(num_reference_fields); 4834 *class_size = size; 4835 } else { 4836 klass->SetNumReferenceInstanceFields(num_reference_fields); 4837 if (!klass->IsVariableSize()) { 4838 std::string temp; 4839 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 4840 size_t previous_size = klass->GetObjectSize(); 4841 if (previous_size != 0) { 4842 // Make sure that we didn't originally have an incorrect size. 4843 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 4844 } 4845 klass->SetObjectSize(size); 4846 } 4847 } 4848 return true; 4849} 4850 4851// Set the bitmap of reference offsets, refOffsets, from the ifields 4852// list. 4853void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4854 uint32_t reference_offsets = 0; 4855 mirror::Class* super_class = klass->GetSuperClass(); 4856 if (super_class != NULL) { 4857 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4858 // If our superclass overflowed, we don't stand a chance. 4859 if (reference_offsets == CLASS_WALK_SUPER) { 4860 klass->SetReferenceInstanceOffsets(reference_offsets); 4861 return; 4862 } 4863 } 4864 CreateReferenceOffsets(klass, false, reference_offsets); 4865} 4866 4867void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4868 CreateReferenceOffsets(klass, true, 0); 4869} 4870 4871void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4872 uint32_t reference_offsets) { 4873 size_t num_reference_fields = 4874 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4875 : klass->NumReferenceInstanceFieldsDuringLinking(); 4876 mirror::ObjectArray<mirror::ArtField>* fields = 4877 is_static ? klass->GetSFields() : klass->GetIFields(); 4878 // All of the fields that contain object references are guaranteed 4879 // to be at the beginning of the fields list. 4880 for (size_t i = 0; i < num_reference_fields; ++i) { 4881 // Note that byte_offset is the offset from the beginning of 4882 // object, not the offset into instance data 4883 mirror::ArtField* field = fields->Get(i); 4884 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4885 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4886 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4887 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4888 CHECK_NE(new_bit, 0U); 4889 reference_offsets |= new_bit; 4890 } else { 4891 reference_offsets = CLASS_WALK_SUPER; 4892 break; 4893 } 4894 } 4895 // Update fields in klass 4896 if (is_static) { 4897 klass->SetReferenceStaticOffsets(reference_offsets); 4898 } else { 4899 klass->SetReferenceInstanceOffsets(reference_offsets); 4900 } 4901} 4902 4903mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4904 Handle<mirror::DexCache> dex_cache) { 4905 DCHECK(dex_cache.Get() != nullptr); 4906 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4907 if (resolved != NULL) { 4908 return resolved; 4909 } 4910 uint32_t utf16_length; 4911 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4912 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4913 dex_cache->SetResolvedString(string_idx, string); 4914 return string; 4915} 4916 4917mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4918 mirror::Class* referrer) { 4919 StackHandleScope<2> hs(Thread::Current()); 4920 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4921 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4922 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4923} 4924 4925mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4926 Handle<mirror::DexCache> dex_cache, 4927 Handle<mirror::ClassLoader> class_loader) { 4928 DCHECK(dex_cache.Get() != NULL); 4929 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4930 if (resolved == NULL) { 4931 Thread* self = Thread::Current(); 4932 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4933 resolved = FindClass(self, descriptor, class_loader); 4934 if (resolved != NULL) { 4935 // TODO: we used to throw here if resolved's class loader was not the 4936 // boot class loader. This was to permit different classes with the 4937 // same name to be loaded simultaneously by different loaders 4938 dex_cache->SetResolvedType(type_idx, resolved); 4939 } else { 4940 CHECK(self->IsExceptionPending()) 4941 << "Expected pending exception for failed resolution of: " << descriptor; 4942 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4943 StackHandleScope<1> hs(self); 4944 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4945 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4946 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4947 self->ClearException(); 4948 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4949 self->GetException(NULL)->SetCause(cause.Get()); 4950 } 4951 } 4952 } 4953 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4954 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4955 return resolved; 4956} 4957 4958mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 4959 Handle<mirror::DexCache> dex_cache, 4960 Handle<mirror::ClassLoader> class_loader, 4961 Handle<mirror::ArtMethod> referrer, 4962 InvokeType type) { 4963 DCHECK(dex_cache.Get() != nullptr); 4964 // Check for hit in the dex cache. 4965 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4966 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 4967 return resolved; 4968 } 4969 // Fail, get the declaring class. 4970 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4971 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4972 if (klass == nullptr) { 4973 DCHECK(Thread::Current()->IsExceptionPending()); 4974 return nullptr; 4975 } 4976 // Scan using method_idx, this saves string compares but will only hit for matching dex 4977 // caches/files. 4978 switch (type) { 4979 case kDirect: // Fall-through. 4980 case kStatic: 4981 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 4982 break; 4983 case kInterface: 4984 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 4985 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 4986 break; 4987 case kSuper: // Fall-through. 4988 case kVirtual: 4989 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 4990 break; 4991 default: 4992 LOG(FATAL) << "Unreachable - invocation type: " << type; 4993 } 4994 if (resolved == nullptr) { 4995 // Search by name, which works across dex files. 4996 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4997 const Signature signature = dex_file.GetMethodSignature(method_id); 4998 switch (type) { 4999 case kDirect: // Fall-through. 5000 case kStatic: 5001 resolved = klass->FindDirectMethod(name, signature); 5002 break; 5003 case kInterface: 5004 resolved = klass->FindInterfaceMethod(name, signature); 5005 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5006 break; 5007 case kSuper: // Fall-through. 5008 case kVirtual: 5009 resolved = klass->FindVirtualMethod(name, signature); 5010 break; 5011 } 5012 } 5013 // If we found a method, check for incompatible class changes. 5014 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5015 // Be a good citizen and update the dex cache to speed subsequent calls. 5016 dex_cache->SetResolvedMethod(method_idx, resolved); 5017 return resolved; 5018 } else { 5019 // If we had a method, it's an incompatible-class-change error. 5020 if (resolved != nullptr) { 5021 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5022 } else { 5023 // We failed to find the method which means either an access error, an incompatible class 5024 // change, or no such method. First try to find the method among direct and virtual methods. 5025 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5026 const Signature signature = dex_file.GetMethodSignature(method_id); 5027 switch (type) { 5028 case kDirect: 5029 case kStatic: 5030 resolved = klass->FindVirtualMethod(name, signature); 5031 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5032 // have had a resolved method before, which triggers the "true" branch above. 5033 break; 5034 case kInterface: 5035 case kVirtual: 5036 case kSuper: 5037 resolved = klass->FindDirectMethod(name, signature); 5038 break; 5039 } 5040 5041 // If we found something, check that it can be accessed by the referrer. 5042 if (resolved != nullptr && referrer.Get() != nullptr) { 5043 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5044 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5045 if (!referring_class->CanAccess(methods_class)) { 5046 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5047 resolved, type); 5048 return nullptr; 5049 } else if (!referring_class->CanAccessMember(methods_class, 5050 resolved->GetAccessFlags())) { 5051 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5052 return nullptr; 5053 } 5054 } 5055 5056 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 5057 // methods and throw if we find the method there. If we find nothing, throw a 5058 // NoSuchMethodError. 5059 switch (type) { 5060 case kDirect: 5061 case kStatic: 5062 if (resolved != nullptr) { 5063 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5064 } else { 5065 resolved = klass->FindInterfaceMethod(name, signature); 5066 if (resolved != nullptr) { 5067 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5068 } else { 5069 ThrowNoSuchMethodError(type, klass, name, signature); 5070 } 5071 } 5072 break; 5073 case kInterface: 5074 if (resolved != nullptr) { 5075 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5076 } else { 5077 resolved = klass->FindVirtualMethod(name, signature); 5078 if (resolved != nullptr) { 5079 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5080 } else { 5081 ThrowNoSuchMethodError(type, klass, name, signature); 5082 } 5083 } 5084 break; 5085 case kSuper: 5086 if (resolved != nullptr) { 5087 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5088 } else { 5089 ThrowNoSuchMethodError(type, klass, name, signature); 5090 } 5091 break; 5092 case kVirtual: 5093 if (resolved != nullptr) { 5094 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5095 } else { 5096 resolved = klass->FindInterfaceMethod(name, signature); 5097 if (resolved != nullptr) { 5098 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5099 } else { 5100 ThrowNoSuchMethodError(type, klass, name, signature); 5101 } 5102 } 5103 break; 5104 } 5105 } 5106 DCHECK(Thread::Current()->IsExceptionPending()); 5107 return nullptr; 5108 } 5109} 5110 5111mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5112 Handle<mirror::DexCache> dex_cache, 5113 Handle<mirror::ClassLoader> class_loader, 5114 bool is_static) { 5115 DCHECK(dex_cache.Get() != nullptr); 5116 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5117 if (resolved != nullptr) { 5118 return resolved; 5119 } 5120 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5121 Thread* const self = Thread::Current(); 5122 StackHandleScope<1> hs(self); 5123 Handle<mirror::Class> klass( 5124 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5125 if (klass.Get() == nullptr) { 5126 DCHECK(Thread::Current()->IsExceptionPending()); 5127 return nullptr; 5128 } 5129 5130 if (is_static) { 5131 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5132 } else { 5133 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5134 } 5135 5136 if (resolved == nullptr) { 5137 const char* name = dex_file.GetFieldName(field_id); 5138 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5139 if (is_static) { 5140 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5141 } else { 5142 resolved = klass->FindInstanceField(name, type); 5143 } 5144 if (resolved == nullptr) { 5145 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5146 return NULL; 5147 } 5148 } 5149 dex_cache->SetResolvedField(field_idx, resolved); 5150 return resolved; 5151} 5152 5153mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5154 uint32_t field_idx, 5155 Handle<mirror::DexCache> dex_cache, 5156 Handle<mirror::ClassLoader> class_loader) { 5157 DCHECK(dex_cache.Get() != nullptr); 5158 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5159 if (resolved != nullptr) { 5160 return resolved; 5161 } 5162 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5163 Thread* self = Thread::Current(); 5164 StackHandleScope<1> hs(self); 5165 Handle<mirror::Class> klass( 5166 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5167 if (klass.Get() == NULL) { 5168 DCHECK(Thread::Current()->IsExceptionPending()); 5169 return NULL; 5170 } 5171 5172 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5173 StringPiece type(dex_file.StringDataByIdx( 5174 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5175 resolved = mirror::Class::FindField(self, klass, name, type); 5176 if (resolved != NULL) { 5177 dex_cache->SetResolvedField(field_idx, resolved); 5178 } else { 5179 ThrowNoSuchFieldError("", klass.Get(), type, name); 5180 } 5181 return resolved; 5182} 5183 5184const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5185 uint32_t* length) { 5186 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5187 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5188 const DexFile& dex_file = *dex_cache->GetDexFile(); 5189 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5190 return dex_file.GetMethodShorty(method_id, length); 5191} 5192 5193void ClassLinker::DumpAllClasses(int flags) { 5194 if (dex_cache_image_class_lookup_required_) { 5195 MoveImageClassesToClassTable(); 5196 } 5197 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5198 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5199 std::vector<mirror::Class*> all_classes; 5200 { 5201 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5202 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5203 mirror::Class* klass = it.second.Read(); 5204 all_classes.push_back(klass); 5205 } 5206 } 5207 5208 for (size_t i = 0; i < all_classes.size(); ++i) { 5209 all_classes[i]->DumpClass(std::cerr, flags); 5210 } 5211} 5212 5213void ClassLinker::DumpForSigQuit(std::ostream& os) { 5214 if (dex_cache_image_class_lookup_required_) { 5215 MoveImageClassesToClassTable(); 5216 } 5217 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5218 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5219} 5220 5221size_t ClassLinker::NumLoadedClasses() { 5222 if (dex_cache_image_class_lookup_required_) { 5223 MoveImageClassesToClassTable(); 5224 } 5225 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5226 return class_table_.size(); 5227} 5228 5229pid_t ClassLinker::GetClassesLockOwner() { 5230 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5231} 5232 5233pid_t ClassLinker::GetDexLockOwner() { 5234 return dex_lock_.GetExclusiveOwnerTid(); 5235} 5236 5237void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5238 DCHECK(!init_done_); 5239 5240 DCHECK(klass != NULL); 5241 DCHECK(klass->GetClassLoader() == NULL); 5242 5243 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5244 DCHECK(class_roots != NULL); 5245 DCHECK(class_roots->Get(class_root) == NULL); 5246 class_roots->Set<false>(class_root, klass); 5247} 5248 5249} // namespace art 5250