class_linker.cc revision ca0c8d3f81cdee58bd9a70c0fd26f79917dff3b5
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <fcntl.h> 20#include <sys/file.h> 21#include <sys/stat.h> 22#include <deque> 23#include <memory> 24#include <string> 25#include <utility> 26#include <vector> 27 28#include "base/casts.h" 29#include "base/logging.h" 30#include "base/scoped_flock.h" 31#include "base/stl_util.h" 32#include "base/unix_file/fd_file.h" 33#include "class_linker-inl.h" 34#include "compiler_callbacks.h" 35#include "debugger.h" 36#include "dex_file-inl.h" 37#include "gc_root-inl.h" 38#include "gc/accounting/card_table-inl.h" 39#include "gc/accounting/heap_bitmap.h" 40#include "gc/heap.h" 41#include "gc/space/image_space.h" 42#include "handle_scope.h" 43#include "intern_table.h" 44#include "interpreter/interpreter.h" 45#include "leb128.h" 46#include "method_helper-inl.h" 47#include "oat.h" 48#include "oat_file.h" 49#include "object_lock.h" 50#include "mirror/art_field-inl.h" 51#include "mirror/art_method-inl.h" 52#include "mirror/class.h" 53#include "mirror/class-inl.h" 54#include "mirror/class_loader.h" 55#include "mirror/dex_cache-inl.h" 56#include "mirror/iftable-inl.h" 57#include "mirror/object-inl.h" 58#include "mirror/object_array-inl.h" 59#include "mirror/proxy.h" 60#include "mirror/reference-inl.h" 61#include "mirror/stack_trace_element.h" 62#include "mirror/string-inl.h" 63#include "os.h" 64#include "runtime.h" 65#include "entrypoints/entrypoint_utils.h" 66#include "ScopedLocalRef.h" 67#include "scoped_thread_state_change.h" 68#include "handle_scope-inl.h" 69#include "thread.h" 70#include "utils.h" 71#include "verifier/method_verifier.h" 72#include "well_known_classes.h" 73 74namespace art { 75 76static void ThrowNoClassDefFoundError(const char* fmt, ...) 77 __attribute__((__format__(__printf__, 1, 2))) 78 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 79static void ThrowNoClassDefFoundError(const char* fmt, ...) { 80 va_list args; 81 va_start(args, fmt); 82 Thread* self = Thread::Current(); 83 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 84 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 85 va_end(args); 86} 87 88static void ThrowEarlierClassFailure(mirror::Class* c) 89 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 90 // The class failed to initialize on a previous attempt, so we want to throw 91 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 92 // failed in verification, in which case v2 5.4.1 says we need to re-throw 93 // the previous error. 94 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 95 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 96 } 97 98 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 99 Thread* self = Thread::Current(); 100 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 101 if (c->GetVerifyErrorClass() != NULL) { 102 // TODO: change the verifier to store an _instance_, with a useful detail message? 103 std::string temp; 104 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 105 PrettyDescriptor(c).c_str()); 106 } else { 107 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 108 PrettyDescriptor(c).c_str()); 109 } 110} 111 112static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 113 Thread* self = Thread::Current(); 114 JNIEnv* env = self->GetJniEnv(); 115 116 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 117 CHECK(cause.get() != NULL); 118 119 env->ExceptionClear(); 120 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 121 env->Throw(cause.get()); 122 123 // We only wrap non-Error exceptions; an Error can just be used as-is. 124 if (!is_error) { 125 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 126 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 127 } 128} 129 130static size_t Hash(const char* s) { 131 // This is the java.lang.String hashcode for convenience, not interoperability. 132 size_t hash = 0; 133 for (; *s != '\0'; ++s) { 134 hash = hash * 31 + *s; 135 } 136 return hash; 137} 138 139const char* ClassLinker::class_roots_descriptors_[] = { 140 "Ljava/lang/Class;", 141 "Ljava/lang/Object;", 142 "[Ljava/lang/Class;", 143 "[Ljava/lang/Object;", 144 "Ljava/lang/String;", 145 "Ljava/lang/DexCache;", 146 "Ljava/lang/ref/Reference;", 147 "Ljava/lang/reflect/ArtField;", 148 "Ljava/lang/reflect/ArtMethod;", 149 "Ljava/lang/reflect/Proxy;", 150 "[Ljava/lang/String;", 151 "[Ljava/lang/reflect/ArtField;", 152 "[Ljava/lang/reflect/ArtMethod;", 153 "Ljava/lang/ClassLoader;", 154 "Ljava/lang/Throwable;", 155 "Ljava/lang/ClassNotFoundException;", 156 "Ljava/lang/StackTraceElement;", 157 "Z", 158 "B", 159 "C", 160 "D", 161 "F", 162 "I", 163 "J", 164 "S", 165 "V", 166 "[Z", 167 "[B", 168 "[C", 169 "[D", 170 "[F", 171 "[I", 172 "[J", 173 "[S", 174 "[Ljava/lang/StackTraceElement;", 175}; 176 177ClassLinker::ClassLinker(InternTable* intern_table) 178 // dex_lock_ is recursive as it may be used in stack dumping. 179 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 180 dex_cache_image_class_lookup_required_(false), 181 failed_dex_cache_class_lookups_(0), 182 class_roots_(nullptr), 183 array_iftable_(nullptr), 184 find_array_class_cache_next_victim_(0), 185 init_done_(false), 186 log_new_dex_caches_roots_(false), 187 log_new_class_table_roots_(false), 188 intern_table_(intern_table), 189 portable_resolution_trampoline_(nullptr), 190 quick_resolution_trampoline_(nullptr), 191 portable_imt_conflict_trampoline_(nullptr), 192 quick_imt_conflict_trampoline_(nullptr), 193 quick_generic_jni_trampoline_(nullptr), 194 quick_to_interpreter_bridge_trampoline_(nullptr) { 195 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 196 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 197} 198 199// To set a value for generic JNI. May be necessary in compiler tests. 200extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 201extern "C" void art_quick_resolution_trampoline(mirror::ArtMethod*); 202extern "C" void art_quick_imt_conflict_trampoline(mirror::ArtMethod*); 203extern "C" void art_quick_to_interpreter_bridge(mirror::ArtMethod*); 204 205void ClassLinker::InitWithoutImage(const std::vector<const DexFile*>& boot_class_path) { 206 VLOG(startup) << "ClassLinker::Init"; 207 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 208 209 CHECK(!init_done_); 210 211 // java_lang_Class comes first, it's needed for AllocClass 212 Thread* self = Thread::Current(); 213 gc::Heap* heap = Runtime::Current()->GetHeap(); 214 // The GC can't handle an object with a null class since we can't get the size of this object. 215 heap->IncrementDisableMovingGC(self); 216 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 217 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 218 heap->AllocNonMovableObject<true>(self, nullptr, 219 mirror::Class::ClassClassSize(), 220 VoidFunctor())))); 221 CHECK(java_lang_Class.Get() != NULL); 222 mirror::Class::SetClassClass(java_lang_Class.Get()); 223 java_lang_Class->SetClass(java_lang_Class.Get()); 224 if (kUseBakerOrBrooksReadBarrier) { 225 java_lang_Class->AssertReadBarrierPointer(); 226 } 227 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 228 heap->DecrementDisableMovingGC(self); 229 // AllocClass(mirror::Class*) can now be used 230 231 // Class[] is used for reflection support. 232 Handle<mirror::Class> class_array_class(hs.NewHandle( 233 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 234 class_array_class->SetComponentType(java_lang_Class.Get()); 235 236 // java_lang_Object comes next so that object_array_class can be created. 237 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 238 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 239 CHECK(java_lang_Object.Get() != NULL); 240 // backfill Object as the super class of Class. 241 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 242 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 243 244 // Object[] next to hold class roots. 245 Handle<mirror::Class> object_array_class(hs.NewHandle( 246 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 247 object_array_class->SetComponentType(java_lang_Object.Get()); 248 249 // Setup the char (primitive) class to be used for char[]. 250 Handle<mirror::Class> char_class(hs.NewHandle( 251 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 252 253 // Setup the char[] class to be used for String. 254 Handle<mirror::Class> char_array_class(hs.NewHandle( 255 AllocClass(self, java_lang_Class.Get(), 256 mirror::Array::ClassSize()))); 257 char_array_class->SetComponentType(char_class.Get()); 258 mirror::CharArray::SetArrayClass(char_array_class.Get()); 259 260 // Setup String. 261 Handle<mirror::Class> java_lang_String(hs.NewHandle( 262 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 263 mirror::String::SetClass(java_lang_String.Get()); 264 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 265 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 266 267 // Setup Reference. 268 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 269 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 270 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 271 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 272 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 273 274 // Create storage for root classes, save away our work so far (requires descriptors). 275 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 276 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 277 kClassRootsMax)); 278 CHECK(!class_roots_.IsNull()); 279 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 280 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 281 SetClassRoot(kClassArrayClass, class_array_class.Get()); 282 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 283 SetClassRoot(kCharArrayClass, char_array_class.Get()); 284 SetClassRoot(kJavaLangString, java_lang_String.Get()); 285 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 286 287 // Setup the primitive type classes. 288 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 289 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 290 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 291 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 292 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 293 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 294 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 295 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 296 297 // Create array interface entries to populate once we can load system classes. 298 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 299 300 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 301 Handle<mirror::Class> int_array_class(hs.NewHandle( 302 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 303 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 304 mirror::IntArray::SetArrayClass(int_array_class.Get()); 305 SetClassRoot(kIntArrayClass, int_array_class.Get()); 306 307 // now that these are registered, we can use AllocClass() and AllocObjectArray 308 309 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 310 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 311 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 312 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 313 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 314 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 315 316 // Constructor, Field, Method, and AbstractMethod are necessary so 317 // that FindClass can link members. 318 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 319 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 320 CHECK(java_lang_reflect_ArtField.Get() != NULL); 321 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 322 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 323 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 324 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 325 326 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 327 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 328 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 329 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 330 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 331 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 332 333 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 334 335 // Set up array classes for string, field, method 336 Handle<mirror::Class> object_array_string(hs.NewHandle( 337 AllocClass(self, java_lang_Class.Get(), 338 mirror::ObjectArray<mirror::String>::ClassSize()))); 339 object_array_string->SetComponentType(java_lang_String.Get()); 340 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 341 342 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 343 AllocClass(self, java_lang_Class.Get(), 344 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 345 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 346 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 347 348 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 349 AllocClass(self, java_lang_Class.Get(), 350 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 351 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 352 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 353 354 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 355 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 356 // these roots. 357 CHECK_NE(0U, boot_class_path.size()); 358 for (size_t i = 0; i != boot_class_path.size(); ++i) { 359 const DexFile* dex_file = boot_class_path[i]; 360 CHECK(dex_file != NULL); 361 AppendToBootClassPath(*dex_file); 362 } 363 364 // now we can use FindSystemClass 365 366 // run char class through InitializePrimitiveClass to finish init 367 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 368 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 369 370 // Create runtime resolution and imt conflict methods. Also setup the default imt. 371 Runtime* runtime = Runtime::Current(); 372 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 373 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 374 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 375 376 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 377 // we do not need friend classes or a publicly exposed setter. 378 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 379 if (!runtime->IsCompiler()) { 380 // We need to set up the generic trampolines since we don't have an image. 381 quick_resolution_trampoline_ = reinterpret_cast<void*>(art_quick_resolution_trampoline); 382 quick_imt_conflict_trampoline_ = reinterpret_cast<void*>(art_quick_imt_conflict_trampoline); 383 quick_to_interpreter_bridge_trampoline_ = reinterpret_cast<void*>(art_quick_to_interpreter_bridge); 384 } 385 386 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 387 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 388 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 389 CHECK_EQ(java_lang_Object.Get(), Object_class); 390 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 391 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 392 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 393 std::ostringstream os1, os2; 394 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 395 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 396 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 397 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 398 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 399 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 400 CHECK_EQ(java_lang_String.Get(), String_class); 401 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 402 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 403 404 // Setup the primitive array type classes - can't be done until Object has a vtable. 405 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 406 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 407 408 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 409 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 410 411 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 412 CHECK_EQ(char_array_class.Get(), found_char_array_class); 413 414 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 415 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 416 417 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 418 CHECK_EQ(int_array_class.Get(), found_int_array_class); 419 420 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 421 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 422 423 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 424 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 425 426 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 427 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 428 429 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 430 CHECK_EQ(class_array_class.Get(), found_class_array_class); 431 432 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 433 CHECK_EQ(object_array_class.Get(), found_object_array_class); 434 435 // Setup the single, global copy of "iftable". 436 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 437 CHECK(java_lang_Cloneable != NULL); 438 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 439 CHECK(java_io_Serializable != NULL); 440 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 441 // crawl up and explicitly list all of the supers as well. 442 { 443 mirror::IfTable* array_iftable = array_iftable_.Read(); 444 array_iftable->SetInterface(0, java_lang_Cloneable); 445 array_iftable->SetInterface(1, java_io_Serializable); 446 } 447 448 // Sanity check Class[] and Object[]'s interfaces. 449 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 450 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 451 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 452 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 453 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 454 // dex_cache_ fields and register them in class_table_. 455 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 456 CHECK_EQ(java_lang_Class.Get(), Class_class); 457 458 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 459 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 460 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 461 462 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 463 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 464 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 465 466 mirror::Class* String_array_class = 467 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 468 CHECK_EQ(object_array_string.Get(), String_array_class); 469 470 mirror::Class* Art_method_array_class = 471 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 472 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 473 474 mirror::Class* Art_field_array_class = 475 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 476 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 477 478 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 479 480 // Create java.lang.reflect.Proxy root. 481 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 482 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 483 484 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 485 // finish initializing Reference class 486 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 487 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 488 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 489 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 490 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 491 mirror::Class* java_lang_ref_FinalizerReference = 492 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 493 java_lang_ref_FinalizerReference->SetAccessFlags( 494 java_lang_ref_FinalizerReference->GetAccessFlags() | 495 kAccClassIsReference | kAccClassIsFinalizerReference); 496 mirror::Class* java_lang_ref_PhantomReference = 497 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 498 java_lang_ref_PhantomReference->SetAccessFlags( 499 java_lang_ref_PhantomReference->GetAccessFlags() | 500 kAccClassIsReference | kAccClassIsPhantomReference); 501 mirror::Class* java_lang_ref_SoftReference = 502 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 503 java_lang_ref_SoftReference->SetAccessFlags( 504 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 505 mirror::Class* java_lang_ref_WeakReference = 506 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 507 java_lang_ref_WeakReference->SetAccessFlags( 508 java_lang_ref_WeakReference->GetAccessFlags() | 509 kAccClassIsReference | kAccClassIsWeakReference); 510 511 // Setup the ClassLoader, verifying the object_size_. 512 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 513 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 514 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 515 516 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 517 // java.lang.StackTraceElement as a convenience. 518 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 519 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 520 SetClassRoot(kJavaLangClassNotFoundException, 521 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 522 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 523 SetClassRoot(kJavaLangStackTraceElementArrayClass, 524 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 525 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 526 527 FinishInit(self); 528 529 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 530} 531 532void ClassLinker::FinishInit(Thread* self) { 533 VLOG(startup) << "ClassLinker::FinishInit entering"; 534 535 // Let the heap know some key offsets into java.lang.ref instances 536 // Note: we hard code the field indexes here rather than using FindInstanceField 537 // as the types of the field can't be resolved prior to the runtime being 538 // fully initialized 539 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 540 mirror::Class* java_lang_ref_FinalizerReference = 541 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 542 543 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 544 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 545 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 546 547 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 548 CHECK_STREQ(queue->GetName(), "queue"); 549 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 550 551 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 552 CHECK_STREQ(queueNext->GetName(), "queueNext"); 553 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 554 555 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 556 CHECK_STREQ(referent->GetName(), "referent"); 557 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 558 559 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 560 CHECK_STREQ(zombie->GetName(), "zombie"); 561 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 562 563 // ensure all class_roots_ are initialized 564 for (size_t i = 0; i < kClassRootsMax; i++) { 565 ClassRoot class_root = static_cast<ClassRoot>(i); 566 mirror::Class* klass = GetClassRoot(class_root); 567 CHECK(klass != NULL); 568 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 569 // note SetClassRoot does additional validation. 570 // if possible add new checks there to catch errors early 571 } 572 573 CHECK(!array_iftable_.IsNull()); 574 575 // disable the slow paths in FindClass and CreatePrimitiveClass now 576 // that Object, Class, and Object[] are setup 577 init_done_ = true; 578 579 VLOG(startup) << "ClassLinker::FinishInit exiting"; 580} 581 582void ClassLinker::RunRootClinits() { 583 Thread* self = Thread::Current(); 584 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 585 mirror::Class* c = GetClassRoot(ClassRoot(i)); 586 if (!c->IsArrayClass() && !c->IsPrimitive()) { 587 StackHandleScope<1> hs(self); 588 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 589 EnsureInitialized(h_class, true, true); 590 self->AssertNoPendingException(); 591 } 592 } 593} 594 595bool ClassLinker::GenerateOatFile(const char* dex_filename, 596 int oat_fd, 597 const char* oat_cache_filename, 598 std::string* error_msg) { 599 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 600 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 601 602 gc::Heap* heap = Runtime::Current()->GetHeap(); 603 std::string boot_image_option("--boot-image="); 604 if (heap->GetImageSpace() == nullptr) { 605 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 606 // out of space anyway it might not matter. 607 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 608 "without an image.", dex_filename); 609 return false; 610 } 611 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 612 613 std::string dex_file_option("--dex-file="); 614 dex_file_option += dex_filename; 615 616 std::string oat_fd_option("--oat-fd="); 617 StringAppendF(&oat_fd_option, "%d", oat_fd); 618 619 std::string oat_location_option("--oat-location="); 620 oat_location_option += oat_cache_filename; 621 622 std::vector<std::string> argv; 623 argv.push_back(dex2oat); 624 argv.push_back("--runtime-arg"); 625 argv.push_back("-classpath"); 626 argv.push_back("--runtime-arg"); 627 argv.push_back(Runtime::Current()->GetClassPathString()); 628 629 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 630 631 if (!Runtime::Current()->IsVerificationEnabled()) { 632 argv.push_back("--compiler-filter=verify-none"); 633 } 634 635 if (Runtime::Current()->MustRelocateIfPossible()) { 636 argv.push_back("--runtime-arg"); 637 argv.push_back("-Xrelocate"); 638 } else { 639 argv.push_back("--runtime-arg"); 640 argv.push_back("-Xnorelocate"); 641 } 642 643 if (!kIsTargetBuild) { 644 argv.push_back("--host"); 645 } 646 647 argv.push_back(boot_image_option); 648 argv.push_back(dex_file_option); 649 argv.push_back(oat_fd_option); 650 argv.push_back(oat_location_option); 651 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 652 for (size_t i = 0; i < compiler_options.size(); ++i) { 653 argv.push_back(compiler_options[i].c_str()); 654 } 655 656 return Exec(argv, error_msg); 657} 658 659const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 660 WriterMutexLock mu(Thread::Current(), dex_lock_); 661 if (kIsDebugBuild) { 662 for (size_t i = 0; i < oat_files_.size(); ++i) { 663 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 664 } 665 } 666 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 667 oat_files_.push_back(oat_file); 668 return oat_file; 669} 670 671OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 672 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 673 OatFile* oat_file = space->ReleaseOatFile(); 674 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 675 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 676 return *oat_file; 677} 678 679const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 680 const char* dex_location = dex_file.GetLocation().c_str(); 681 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 682 return FindOpenedOatFile(nullptr, dex_location, &dex_location_checksum); 683} 684 685const OatFile* ClassLinker::FindOpenedOatFile(const char* oat_location, const char* dex_location, 686 const uint32_t* const dex_location_checksum) { 687 ReaderMutexLock mu(Thread::Current(), dex_lock_); 688 for (size_t i = 0; i < oat_files_.size(); i++) { 689 const OatFile* oat_file = oat_files_[i]; 690 DCHECK(oat_file != NULL); 691 692 if (oat_location != nullptr) { 693 if (oat_file->GetLocation() != oat_location) { 694 continue; 695 } 696 } 697 698 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 699 dex_location_checksum, 700 false); 701 if (oat_dex_file != NULL) { 702 return oat_file; 703 } 704 } 705 return NULL; 706} 707 708 709// Loads all multi dex files from the given oat file returning true on success. 710// 711// Parameters: 712// oat_file - the oat file to load from 713// dex_location - the dex location used to generate the oat file 714// dex_location_checksum - the checksum of the dex_location (may be null for pre-opted files) 715// generated - whether or not the oat_file existed before or was just (re)generated 716// error_msgs - any error messages will be appended here 717// dex_files - the loaded dex_files will be appended here (only if the loading succeeds) 718static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, 719 const char* dex_location, 720 const uint32_t* dex_location_checksum, 721 bool generated, 722 std::vector<std::string>* error_msgs, 723 std::vector<const DexFile*>* dex_files) { 724 if (oat_file == nullptr) { 725 return false; 726 } 727 728 size_t old_size = dex_files->size(); // To rollback on error. 729 730 bool success = true; 731 for (size_t i = 0; success; ++i) { 732 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 733 const char* next_name = next_name_str.c_str(); 734 735 uint32_t next_location_checksum; 736 uint32_t* next_location_checksum_pointer = &next_location_checksum; 737 std::string error_msg; 738 if ((i == 0) && (strcmp(next_name, dex_location) == 0)) { 739 // When i=0 the multidex name should be the same as the location name. We already have the 740 // checksum it so we don't need to recompute it. 741 if (dex_location_checksum == nullptr) { 742 next_location_checksum_pointer = nullptr; 743 } else { 744 next_location_checksum = *dex_location_checksum; 745 } 746 } else if (!DexFile::GetChecksum(next_name, next_location_checksum_pointer, &error_msg)) { 747 DCHECK_EQ(false, i == 0 && generated); 748 next_location_checksum_pointer = nullptr; 749 } 750 751 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 752 753 if (oat_dex_file == nullptr) { 754 if (i == 0 && generated) { 755 std::string error_msg; 756 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 757 " file'%s'", dex_location, next_location_checksum, 758 oat_file->GetLocation().c_str()); 759 error_msgs->push_back(error_msg); 760 } 761 break; // Not found, done. 762 } 763 764 // Checksum test. Test must succeed when generated. 765 success = !generated; 766 if (next_location_checksum_pointer != nullptr) { 767 success = next_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 768 } 769 770 if (success) { 771 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 772 if (dex_file == nullptr) { 773 success = false; 774 error_msgs->push_back(error_msg); 775 } else { 776 dex_files->push_back(dex_file); 777 } 778 } 779 780 // When we generated the file, we expect success, or something is terribly wrong. 781 CHECK_EQ(false, generated && !success) 782 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 783 << std::hex << " dex_location_checksum=" << next_location_checksum 784 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 785 } 786 787 if (dex_files->size() == old_size) { 788 success = false; // We did not even find classes.dex 789 } 790 791 if (success) { 792 return true; 793 } else { 794 // Free all the dex files we have loaded. 795 auto it = dex_files->begin() + old_size; 796 auto it_end = dex_files->end(); 797 for (; it != it_end; it++) { 798 delete *it; 799 } 800 dex_files->erase(dex_files->begin() + old_size, it_end); 801 802 return false; 803 } 804} 805 806// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 807// complicates the loading process, as we should not use an iterative loading process, because that 808// would register the oat file and dex files that come before the broken one. Instead, check all 809// multidex ahead of time. 810bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 811 std::vector<std::string>* error_msgs, 812 std::vector<const DexFile*>* dex_files) { 813 // 1) Check whether we have an open oat file. 814 // This requires a dex checksum, use the "primary" one. 815 uint32_t dex_location_checksum; 816 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 817 bool have_checksum = true; 818 std::string checksum_error_msg; 819 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 820 // This happens for pre-opted files since the corresponding dex files are no longer on disk. 821 dex_location_checksum_pointer = nullptr; 822 have_checksum = false; 823 } 824 825 bool needs_registering = false; 826 827 std::unique_ptr<const OatFile> open_oat_file(FindOpenedOatFile(oat_location, dex_location, 828 dex_location_checksum_pointer)); 829 830 // 2) If we do not have an open one, maybe there's one on disk already. 831 832 // In case the oat file is not open, we play a locking game here so 833 // that if two different processes race to load and register or generate 834 // (or worse, one tries to open a partial generated file) we will be okay. 835 // This is actually common with apps that use DexClassLoader to work 836 // around the dex method reference limit and that have a background 837 // service running in a separate process. 838 ScopedFlock scoped_flock; 839 840 if (open_oat_file.get() == nullptr) { 841 if (oat_location != nullptr) { 842 // Can only do this if we have a checksum, else error. 843 if (!have_checksum) { 844 error_msgs->push_back(checksum_error_msg); 845 return false; 846 } 847 848 std::string error_msg; 849 850 // We are loading or creating one in the future. Time to set up the file lock. 851 if (!scoped_flock.Init(oat_location, &error_msg)) { 852 error_msgs->push_back(error_msg); 853 return false; 854 } 855 856 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 857 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 858 oat_location, &error_msg)); 859 860 if (open_oat_file.get() == nullptr) { 861 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 862 dex_location, oat_location, error_msg.c_str()); 863 VLOG(class_linker) << compound_msg; 864 error_msgs->push_back(compound_msg); 865 } 866 } else { 867 // TODO: What to lock here? 868 bool obsolete_file_cleanup_failed; 869 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 870 dex_location_checksum_pointer, 871 kRuntimeISA, error_msgs, 872 &obsolete_file_cleanup_failed)); 873 // There's no point in going forward and eventually try to regenerate the 874 // file if we couldn't remove the obsolete one. Mostly likely we will fail 875 // with the same error when trying to write the new file. 876 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 877 if (obsolete_file_cleanup_failed) { 878 return false; 879 } 880 } 881 needs_registering = true; 882 } 883 884 // 3) If we have an oat file, check all contained multidex files for our dex_location. 885 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 886 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 887 dex_location_checksum_pointer, 888 false, error_msgs, dex_files); 889 if (success) { 890 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 891 if (needs_registering) { 892 // We opened the oat file, so we must register it. 893 RegisterOatFile(oat_file); 894 } 895 // If the file isn't executable we failed patchoat but did manage to get the dex files. 896 return oat_file->IsExecutable(); 897 } else { 898 if (needs_registering) { 899 // We opened it, delete it. 900 open_oat_file.reset(); 901 } else { 902 open_oat_file.release(); // Do not delete open oat files. 903 } 904 } 905 906 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 907 908 // Need a checksum, fail else. 909 if (!have_checksum) { 910 error_msgs->push_back(checksum_error_msg); 911 return false; 912 } 913 914 // Look in cache location if no oat_location is given. 915 std::string cache_location; 916 if (oat_location == nullptr) { 917 // Use the dalvik cache. 918 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 919 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 920 oat_location = cache_location.c_str(); 921 } 922 923 bool has_flock = true; 924 // Definitely need to lock now. 925 if (!scoped_flock.HasFile()) { 926 std::string error_msg; 927 if (!scoped_flock.Init(oat_location, &error_msg)) { 928 error_msgs->push_back(error_msg); 929 has_flock = false; 930 } 931 } 932 933 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 934 // Create the oat file. 935 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 936 oat_location, error_msgs)); 937 } 938 939 // Failed, bail. 940 if (open_oat_file.get() == nullptr) { 941 std::string error_msg; 942 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 943 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 944 error_msgs->push_back(error_msg); 945 return false; 946 } 947 948 // Try to load again, but stronger checks. 949 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, dex_location_checksum_pointer, 950 true, error_msgs, dex_files); 951 if (success) { 952 RegisterOatFile(open_oat_file.release()); 953 return true; 954 } else { 955 return false; 956 } 957} 958 959const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 960 uint32_t dex_location_checksum, 961 const char* oat_location, 962 std::string* error_msg) { 963 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 964 !Runtime::Current()->IsCompiler(), 965 error_msg)); 966 if (oat_file.get() == nullptr) { 967 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 968 error_msg->c_str()); 969 return nullptr; 970 } 971 Runtime* runtime = Runtime::Current(); 972 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 973 if (image_space != nullptr) { 974 const ImageHeader& image_header = image_space->GetImageHeader(); 975 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 976 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 977 if (expected_image_oat_checksum != actual_image_oat_checksum) { 978 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 979 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 980 actual_image_oat_checksum); 981 return nullptr; 982 } 983 984 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 985 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 986 if (expected_image_oat_offset != actual_image_oat_offset) { 987 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 988 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 989 actual_image_oat_offset); 990 return nullptr; 991 } 992 int32_t expected_patch_delta = image_header.GetPatchDelta(); 993 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 994 if (expected_patch_delta != actual_patch_delta) { 995 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 996 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 997 return nullptr; 998 } 999 } 1000 1001 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1002 &dex_location_checksum); 1003 if (oat_dex_file == nullptr) { 1004 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 1005 dex_location); 1006 return nullptr; 1007 } 1008 uint32_t expected_dex_checksum = dex_location_checksum; 1009 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 1010 if (expected_dex_checksum != actual_dex_checksum) { 1011 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 1012 "found 0x%x", oat_location, expected_dex_checksum, 1013 actual_dex_checksum); 1014 return nullptr; 1015 } 1016 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 1017 if (dex_file.get() != nullptr) { 1018 return oat_file.release(); 1019 } else { 1020 return nullptr; 1021 } 1022} 1023 1024const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1025 int fd, const char* oat_location, 1026 std::vector<std::string>* error_msgs) { 1027 // Generate the output oat file for the dex file 1028 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1029 std::string error_msg; 1030 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1031 CHECK(!error_msg.empty()); 1032 error_msgs->push_back(error_msg); 1033 return nullptr; 1034 } 1035 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 1036 !Runtime::Current()->IsCompiler(), 1037 &error_msg)); 1038 if (oat_file.get() == nullptr) { 1039 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1040 oat_location, error_msg.c_str()); 1041 error_msgs->push_back(compound_msg); 1042 return nullptr; 1043 } 1044 1045 return oat_file.release(); 1046} 1047 1048bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1049 const InstructionSet instruction_set) { 1050 Runtime* runtime = Runtime::Current(); 1051 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1052 if (image_space == nullptr) { 1053 return false; 1054 } 1055 uint32_t image_oat_checksum = 0; 1056 if (instruction_set == kRuntimeISA) { 1057 const ImageHeader& image_header = image_space->GetImageHeader(); 1058 image_oat_checksum = image_header.GetOatChecksum(); 1059 } else { 1060 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1061 image_space->GetImageLocation().c_str(), instruction_set)); 1062 image_oat_checksum = image_header->GetOatChecksum(); 1063 } 1064 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1065} 1066 1067bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1068 const InstructionSet instruction_set, 1069 std::string* error_msg) { 1070 Runtime* runtime = Runtime::Current(); 1071 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1072 if (image_space == nullptr) { 1073 *error_msg = "No image space for verification against"; 1074 return false; 1075 } 1076 1077 // If the requested instruction set is the same as the current runtime, 1078 // we can use the checksums directly. If it isn't, we'll have to read the 1079 // image header from the image for the right instruction set. 1080 uint32_t image_oat_checksum = 0; 1081 uintptr_t image_oat_data_begin = 0; 1082 int32_t image_patch_delta = 0; 1083 if (instruction_set == Runtime::Current()->GetInstructionSet()) { 1084 const ImageHeader& image_header = image_space->GetImageHeader(); 1085 image_oat_checksum = image_header.GetOatChecksum(); 1086 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1087 image_patch_delta = image_header.GetPatchDelta(); 1088 } else { 1089 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1090 image_space->GetImageLocation().c_str(), instruction_set)); 1091 image_oat_checksum = image_header->GetOatChecksum(); 1092 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1093 image_patch_delta = image_header->GetPatchDelta(); 1094 } 1095 const OatHeader& oat_header = oat_file->GetOatHeader(); 1096 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1097 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1098 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1099 if (!ret) { 1100 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1101 oat_file->GetLocation().c_str(), 1102 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1103 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1104 oat_file->GetOatHeader().GetImagePatchDelta(), 1105 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1106 } 1107 return ret; 1108} 1109 1110bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1111 const char* dex_location, 1112 uint32_t dex_location_checksum, 1113 const InstructionSet instruction_set, 1114 std::string* error_msg) { 1115 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1116 return false; 1117 } 1118 1119 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1120 &dex_location_checksum); 1121 if (oat_dex_file == NULL) { 1122 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1123 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1124 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 1125 for (size_t i = 0; i < oat_dex_files.size(); i++) { 1126 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 1127 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 1128 oat_file->GetLocation().c_str(), 1129 oat_dex_file->GetDexFileLocation().c_str()); 1130 } 1131 return false; 1132 } 1133 1134 if (dex_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) { 1135 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1136 oat_file->GetLocation().c_str(), 1137 oat_dex_file->GetDexFileLocationChecksum(), 1138 dex_location, dex_location_checksum); 1139 return false; 1140 } 1141 return true; 1142} 1143 1144bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1145 const char* dex_location, 1146 const uint32_t* dex_location_checksum, 1147 std::string* error_msg) { 1148 CHECK(oat_file != nullptr); 1149 CHECK(dex_location != nullptr); 1150 std::unique_ptr<const DexFile> dex_file; 1151 if (dex_location_checksum == nullptr) { 1152 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1153 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1154 // directory. 1155 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1156 if (oat_dex_file == nullptr) { 1157 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1158 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1159 error_msg->c_str()); 1160 return false; 1161 } 1162 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1163 } else { 1164 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, *dex_location_checksum, 1165 kRuntimeISA, error_msg); 1166 if (!verified) { 1167 return false; 1168 } 1169 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1170 dex_location_checksum)->OpenDexFile(error_msg)); 1171 } 1172 return dex_file.get() != nullptr; 1173} 1174 1175const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1176 const char* dex_location, 1177 const uint32_t* const dex_location_checksum, 1178 InstructionSet isa, 1179 std::vector<std::string>* error_msgs, 1180 bool* obsolete_file_cleanup_failed) { 1181 *obsolete_file_cleanup_failed = false; 1182 bool already_opened = false; 1183 std::string dex_location_str(dex_location); 1184 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1185 &already_opened, 1186 obsolete_file_cleanup_failed, 1187 error_msgs)); 1188 std::string error_msg; 1189 if (oat_file.get() == nullptr) { 1190 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1191 dex_location)); 1192 return nullptr; 1193 } else if (oat_file->IsExecutable() && 1194 !VerifyOatWithDexFile(oat_file.get(), dex_location, 1195 dex_location_checksum, &error_msg)) { 1196 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1197 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1198 error_msg.c_str())); 1199 return nullptr; 1200 } else if (!oat_file->IsExecutable() && 1201 Runtime::Current()->GetHeap()->HasImageSpace() && 1202 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1203 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1204 "dex location '%s'. Image checksum incorrect.", 1205 oat_file->GetLocation().c_str(), dex_location)); 1206 return nullptr; 1207 } else { 1208 return oat_file.release(); 1209 } 1210} 1211 1212const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1213 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1214 for (size_t i = 0; i < oat_files_.size(); i++) { 1215 const OatFile* oat_file = oat_files_[i]; 1216 DCHECK(oat_file != nullptr); 1217 if (oat_file->GetLocation() == oat_location) { 1218 return oat_file; 1219 } 1220 } 1221 return nullptr; 1222} 1223 1224const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1225 InstructionSet isa, 1226 bool *already_opened, 1227 bool *obsolete_file_cleanup_failed, 1228 std::vector<std::string>* error_msgs) { 1229 // Find out if we've already opened the file 1230 const OatFile* ret = nullptr; 1231 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1232 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1233 if (ret != nullptr) { 1234 *already_opened = true; 1235 return ret; 1236 } 1237 1238 std::string dalvik_cache; 1239 bool have_android_data = false; 1240 bool have_dalvik_cache = false; 1241 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1242 &have_android_data, &have_dalvik_cache); 1243 std::string cache_filename; 1244 if (have_dalvik_cache) { 1245 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1246 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1247 if (ret != nullptr) { 1248 *already_opened = true; 1249 return ret; 1250 } 1251 } else { 1252 // If we need to relocate we should just place odex back where it started. 1253 cache_filename = odex_filename; 1254 } 1255 1256 ret = nullptr; 1257 1258 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1259 // 1260 // Now we do the following: 1261 // 1) Try and open the odex version 1262 // 2) If present, checksum-verified & relocated correctly return it 1263 // 3) Close the odex version to free up its address space. 1264 // 4) Try and open the cache version 1265 // 5) If present, checksum-verified & relocated correctly return it 1266 // 6) Close the cache version to free up its address space. 1267 // 7) If we should relocate: 1268 // a) If we have opened and checksum-verified the odex version relocate it to 1269 // 'cache_filename' and return it 1270 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1271 // it. This should not happen often (I think only the run-test's will hit this case). 1272 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1273 // this point. 1274 // 9) Return nullptr 1275 1276 *already_opened = false; 1277 const Runtime* runtime = Runtime::Current(); 1278 CHECK(runtime != nullptr); 1279 bool executable = !runtime->IsCompiler(); 1280 1281 std::string odex_error_msg; 1282 bool should_patch_system = false; 1283 bool odex_checksum_verified = false; 1284 bool have_system_odex = false; 1285 { 1286 // There is a high probability that these both these oat files map similar/the same address 1287 // spaces so we must scope them like this so they each gets its turn. 1288 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, NULL, 1289 executable, &odex_error_msg)); 1290 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1291 &odex_checksum_verified, 1292 &odex_error_msg)) { 1293 error_msgs->push_back(odex_error_msg); 1294 return odex_oat_file.release(); 1295 } else { 1296 if (odex_checksum_verified) { 1297 // We can just relocate 1298 should_patch_system = true; 1299 odex_error_msg = "Image Patches are incorrect"; 1300 } 1301 if (odex_oat_file.get() != nullptr) { 1302 have_system_odex = true; 1303 } 1304 } 1305 } 1306 1307 std::string cache_error_msg; 1308 bool should_patch_cache = false; 1309 bool cache_checksum_verified = false; 1310 if (have_dalvik_cache) { 1311 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, NULL, 1312 executable, &cache_error_msg)); 1313 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1314 &cache_checksum_verified, 1315 &cache_error_msg)) { 1316 error_msgs->push_back(cache_error_msg); 1317 return cache_oat_file.release(); 1318 } else if (cache_checksum_verified) { 1319 // We can just relocate 1320 should_patch_cache = true; 1321 cache_error_msg = "Image Patches are incorrect"; 1322 } 1323 } else if (have_android_data) { 1324 // dalvik_cache does not exist but android data does. This means we should be able to create 1325 // it, so we should try. 1326 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1327 } 1328 1329 ret = nullptr; 1330 std::string error_msg; 1331 if (runtime->CanRelocate()) { 1332 // Run relocation 1333 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1334 if (space != nullptr) { 1335 const std::string& image_location = space->GetImageLocation(); 1336 if (odex_checksum_verified && should_patch_system) { 1337 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1338 } else if (cache_checksum_verified && should_patch_cache) { 1339 CHECK(have_dalvik_cache); 1340 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1341 } 1342 } else if (have_system_odex) { 1343 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1344 } 1345 } 1346 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1347 // implicitly: were able to fine where the cached version is but we were unable to use it, 1348 // either as a destination for relocation or to open a file. We should delete it if it is 1349 // there. 1350 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1351 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1352 "searching for dex file %s: %s", 1353 cache_filename.c_str(), dex_location.c_str(), 1354 strerror(errno)); 1355 error_msgs->push_back(rm_error_msg); 1356 VLOG(class_linker) << rm_error_msg; 1357 // Let the caller know that we couldn't remove the obsolete file. 1358 // This is a good indication that further writes may fail as well. 1359 *obsolete_file_cleanup_failed = true; 1360 } 1361 } 1362 if (ret == nullptr) { 1363 VLOG(class_linker) << error_msg; 1364 error_msgs->push_back(error_msg); 1365 std::string relocation_msg; 1366 if (runtime->CanRelocate()) { 1367 relocation_msg = StringPrintf(" and relocation failed"); 1368 } 1369 if (have_dalvik_cache && cache_checksum_verified) { 1370 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1371 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1372 cache_filename.c_str(), cache_error_msg.c_str(), 1373 relocation_msg.c_str()); 1374 } else { 1375 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1376 "dalvik_cache availible)%s.", odex_filename.c_str(), 1377 odex_error_msg.c_str(), relocation_msg.c_str()); 1378 } 1379 VLOG(class_linker) << error_msg; 1380 error_msgs->push_back(error_msg); 1381 } 1382 return ret; 1383} 1384 1385const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1386 InstructionSet isa, 1387 std::string* error_msg) { 1388 // We open it non-executable 1389 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, NULL, false, error_msg)); 1390 if (output.get() == nullptr) { 1391 return nullptr; 1392 } 1393 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1394 VerifyOatImageChecksum(output.get(), isa)) { 1395 return output.release(); 1396 } else { 1397 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1398 oat_path.c_str()); 1399 return nullptr; 1400 } 1401} 1402 1403const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1404 const std::string& output_oat, 1405 const std::string& image_location, 1406 InstructionSet isa, 1407 std::string* error_msg) { 1408 if (!Runtime::Current()->GetHeap()->HasImageSpace()) { 1409 // We don't have an image space so there is no point in trying to patchoat. 1410 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1411 << "running without an image. Attempting to use oat file for interpretation."; 1412 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1413 } 1414 if (!Runtime::Current()->IsDex2OatEnabled()) { 1415 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1416 // input_oat but make sure we only do interpretation on it's dex files. 1417 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1418 << "disabled. Attempting to use oat file for interpretation"; 1419 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1420 } 1421 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1422 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1423 1424 std::string isa_arg("--instruction-set="); 1425 isa_arg += GetInstructionSetString(isa); 1426 std::string input_oat_filename_arg("--input-oat-file="); 1427 input_oat_filename_arg += input_oat; 1428 std::string output_oat_filename_arg("--output-oat-file="); 1429 output_oat_filename_arg += output_oat; 1430 std::string patched_image_arg("--patched-image-location="); 1431 patched_image_arg += image_location; 1432 1433 std::vector<std::string> argv; 1434 argv.push_back(patchoat); 1435 argv.push_back(isa_arg); 1436 argv.push_back(input_oat_filename_arg); 1437 argv.push_back(output_oat_filename_arg); 1438 argv.push_back(patched_image_arg); 1439 1440 std::string command_line(Join(argv, ' ')); 1441 LOG(INFO) << "Relocate Oat File: " << command_line; 1442 bool success = Exec(argv, error_msg); 1443 if (success) { 1444 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, NULL, 1445 !Runtime::Current()->IsCompiler(), error_msg)); 1446 bool checksum_verified = false; 1447 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1448 return output.release(); 1449 } else if (output.get() != nullptr) { 1450 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1451 "but output file '%s' failed verifcation: %s", 1452 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1453 } else { 1454 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1455 "but was unable to open output file '%s': %s", 1456 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1457 } 1458 } else if (!Runtime::Current()->IsCompiler()) { 1459 // patchoat failed which means we probably don't have enough room to place the output oat file, 1460 // instead of failing we should just run the interpreter from the dex files in the input oat. 1461 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1462 << "for interpretation. patchoat failure was: " << *error_msg; 1463 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1464 } else { 1465 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1466 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1467 error_msg->c_str()); 1468 } 1469 return nullptr; 1470} 1471 1472int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1473 Runtime* runtime = Runtime::Current(); 1474 int32_t real_patch_delta; 1475 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1476 CHECK(image_space != nullptr); 1477 if (isa == Runtime::Current()->GetInstructionSet()) { 1478 const ImageHeader& image_header = image_space->GetImageHeader(); 1479 real_patch_delta = image_header.GetPatchDelta(); 1480 } else { 1481 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1482 image_space->GetImageLocation().c_str(), isa)); 1483 real_patch_delta = image_header->GetPatchDelta(); 1484 } 1485 const OatHeader& oat_header = oat_file->GetOatHeader(); 1486 return real_patch_delta - oat_header.GetImagePatchDelta(); 1487} 1488 1489bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1490 bool* checksum_verified, 1491 std::string* error_msg) { 1492 std::string compound_msg("Oat file failed to verify: "); 1493 Runtime* runtime = Runtime::Current(); 1494 uint32_t real_image_checksum; 1495 void* real_image_oat_offset; 1496 int32_t real_patch_delta; 1497 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1498 if (image_space == nullptr) { 1499 *error_msg = "No image space present"; 1500 return false; 1501 } 1502 if (isa == Runtime::Current()->GetInstructionSet()) { 1503 const ImageHeader& image_header = image_space->GetImageHeader(); 1504 real_image_checksum = image_header.GetOatChecksum(); 1505 real_image_oat_offset = image_header.GetOatDataBegin(); 1506 real_patch_delta = image_header.GetPatchDelta(); 1507 } else { 1508 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1509 image_space->GetImageLocation().c_str(), isa)); 1510 real_image_checksum = image_header->GetOatChecksum(); 1511 real_image_oat_offset = image_header->GetOatDataBegin(); 1512 real_patch_delta = image_header->GetPatchDelta(); 1513 } 1514 1515 const OatHeader& oat_header = oat_file->GetOatHeader(); 1516 1517 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1518 *checksum_verified = oat_image_checksum == real_image_checksum; 1519 if (!*checksum_verified) { 1520 compound_msg += StringPrintf(" Oat Image Checksum Incorrect (expected 0x%x, recieved 0x%x)", 1521 real_image_checksum, oat_image_checksum); 1522 } 1523 1524 void* oat_image_oat_offset = 1525 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1526 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1527 if (!offset_verified) { 1528 compound_msg += StringPrintf(" Oat Image oat offset incorrect (expected 0x%p, recieved 0x%p)", 1529 real_image_oat_offset, oat_image_oat_offset); 1530 } 1531 1532 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1533 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1534 if (!patch_delta_verified) { 1535 compound_msg += StringPrintf(" Oat image patch delta incorrect (expected 0x%x, recieved 0x%x)", 1536 real_patch_delta, oat_patch_delta); 1537 } 1538 1539 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1540 if (ret) { 1541 *error_msg = compound_msg; 1542 } 1543 return ret; 1544} 1545 1546const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1547 std::string* error_msg) { 1548 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1549 if (oat_file != nullptr) { 1550 return oat_file; 1551 } 1552 1553 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1554 error_msg); 1555 if (oat_file == NULL) { 1556 return NULL; 1557 } 1558 return oat_file; 1559} 1560 1561static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1562 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1563 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1564 1565 DCHECK(obj != NULL); 1566 DCHECK(class_linker != NULL); 1567 1568 if (obj->IsArtMethod()) { 1569 mirror::ArtMethod* method = obj->AsArtMethod(); 1570 if (!method->IsNative()) { 1571 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1572 if (method != Runtime::Current()->GetResolutionMethod()) { 1573 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1574 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1575 } 1576 } 1577 } 1578} 1579 1580void ClassLinker::InitFromImage() { 1581 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1582 CHECK(!init_done_); 1583 1584 Thread* self = Thread::Current(); 1585 gc::Heap* heap = Runtime::Current()->GetHeap(); 1586 gc::space::ImageSpace* space = heap->GetImageSpace(); 1587 dex_cache_image_class_lookup_required_ = true; 1588 CHECK(space != NULL); 1589 OatFile& oat_file = GetImageOatFile(space); 1590 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1591 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1592 const char* image_file_location = oat_file.GetOatHeader(). 1593 GetStoreValueByKey(OatHeader::kImageLocationKey); 1594 CHECK(image_file_location == nullptr || *image_file_location == 0); 1595 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1596 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1597 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1598 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1599 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1600 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1601 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1602 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1603 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1604 1605 StackHandleScope<1> hs(self); 1606 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1607 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1608 AsObjectArray<mirror::Class>())); 1609 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1610 1611 // Special case of setting up the String class early so that we can test arbitrary objects 1612 // as being Strings or not 1613 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1614 1615 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1616 static_cast<uint32_t>(dex_caches->GetLength())); 1617 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1618 StackHandleScope<1> hs(self); 1619 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1620 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1621 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1622 nullptr); 1623 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1624 std::string error_msg; 1625 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1626 if (dex_file == NULL) { 1627 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1628 << " from within oat file " << oat_file.GetLocation() 1629 << " error '" << error_msg << "'"; 1630 } 1631 1632 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1633 1634 AppendToBootClassPath(*dex_file, dex_cache); 1635 } 1636 1637 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1638 // bitmap walk. 1639 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1640 1641 // Set entry point to interpreter if in InterpretOnly mode. 1642 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1643 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1644 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1645 } 1646 1647 // reinit class_roots_ 1648 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1649 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1650 1651 // reinit array_iftable_ from any array class instance, they should be == 1652 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1653 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1654 // String class root was set above 1655 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1656 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1657 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1658 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1659 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1660 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1661 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1662 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1663 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1664 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1665 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1666 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1667 1668 FinishInit(self); 1669 1670 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1671} 1672 1673void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1674 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1675 if ((flags & kVisitRootFlagAllRoots) != 0) { 1676 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1677 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1678 } 1679 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1680 for (auto& pair : new_class_roots_) { 1681 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1682 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1683 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1684 if (UNLIKELY(new_ref != old_ref)) { 1685 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1686 // corresponding object. This is slow, but luckily for us, this may only happen with a 1687 // concurrent moving GC. 1688 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1689 it != end && it->first == pair.first; ++it) { 1690 // If the class stored matches the old class, update it to the new value. 1691 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1692 it->second = GcRoot<mirror::Class>(new_ref); 1693 } 1694 } 1695 } 1696 } 1697 } 1698 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1699 new_class_roots_.clear(); 1700 } 1701 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1702 log_new_class_table_roots_ = true; 1703 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1704 log_new_class_table_roots_ = false; 1705 } 1706 // We deliberately ignore the class roots in the image since we 1707 // handle image roots by using the MS/CMS rescanning of dirty cards. 1708} 1709 1710// Keep in sync with InitCallback. Anything we visit, we need to 1711// reinit references to when reinitializing a ClassLinker from a 1712// mapped image. 1713void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1714 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1715 Thread* self = Thread::Current(); 1716 { 1717 ReaderMutexLock mu(self, dex_lock_); 1718 if ((flags & kVisitRootFlagAllRoots) != 0) { 1719 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1720 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1721 } 1722 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1723 for (size_t index : new_dex_cache_roots_) { 1724 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1725 } 1726 } 1727 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1728 new_dex_cache_roots_.clear(); 1729 } 1730 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1731 log_new_dex_caches_roots_ = true; 1732 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1733 log_new_dex_caches_roots_ = false; 1734 } 1735 } 1736 VisitClassRoots(callback, arg, flags); 1737 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1738 DCHECK(!array_iftable_.IsNull()); 1739 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1740 if (!find_array_class_cache_[i].IsNull()) { 1741 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1742 } 1743 } 1744} 1745 1746void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1747 if (dex_cache_image_class_lookup_required_) { 1748 MoveImageClassesToClassTable(); 1749 } 1750 // TODO: why isn't this a ReaderMutexLock? 1751 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1752 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1753 mirror::Class* c = it.second.Read(); 1754 if (!visitor(c, arg)) { 1755 return; 1756 } 1757 } 1758} 1759 1760static bool GetClassesVisitorSet(mirror::Class* c, void* arg) { 1761 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1762 classes->insert(c); 1763 return true; 1764} 1765 1766struct GetClassesVisitorArrayArg { 1767 Handle<mirror::ObjectArray<mirror::Class>>* classes; 1768 int32_t index; 1769 bool success; 1770}; 1771 1772static bool GetClassesVisitorArray(mirror::Class* c, void* varg) 1773 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1774 GetClassesVisitorArrayArg* arg = reinterpret_cast<GetClassesVisitorArrayArg*>(varg); 1775 if (arg->index < (*arg->classes)->GetLength()) { 1776 (*arg->classes)->Set(arg->index, c); 1777 arg->index++; 1778 return true; 1779 } else { 1780 arg->success = false; 1781 return false; 1782 } 1783} 1784 1785void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1786 // TODO: it may be possible to avoid secondary storage if we iterate over dex caches. The problem 1787 // is avoiding duplicates. 1788 if (!kMovingClasses) { 1789 std::set<mirror::Class*> classes; 1790 VisitClasses(GetClassesVisitorSet, &classes); 1791 for (mirror::Class* klass : classes) { 1792 if (!visitor(klass, arg)) { 1793 return; 1794 } 1795 } 1796 } else { 1797 Thread* self = Thread::Current(); 1798 StackHandleScope<1> hs(self); 1799 Handle<mirror::ObjectArray<mirror::Class>> classes = 1800 hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1801 GetClassesVisitorArrayArg local_arg; 1802 local_arg.classes = &classes; 1803 local_arg.success = false; 1804 // We size the array assuming classes won't be added to the class table during the visit. 1805 // If this assumption fails we iterate again. 1806 while (!local_arg.success) { 1807 size_t class_table_size; 1808 { 1809 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1810 class_table_size = class_table_.size(); 1811 } 1812 mirror::Class* class_type = mirror::Class::GetJavaLangClass(); 1813 mirror::Class* array_of_class = FindArrayClass(self, &class_type); 1814 classes.Assign( 1815 mirror::ObjectArray<mirror::Class>::Alloc(self, array_of_class, class_table_size)); 1816 CHECK(classes.Get() != nullptr); // OOME. 1817 local_arg.index = 0; 1818 local_arg.success = true; 1819 VisitClasses(GetClassesVisitorArray, &local_arg); 1820 } 1821 for (int32_t i = 0; i < classes->GetLength(); ++i) { 1822 // If the class table shrank during creation of the clases array we expect null elements. If 1823 // the class table grew then the loop repeats. If classes are created after the loop has 1824 // finished then we don't visit. 1825 mirror::Class* klass = classes->Get(i); 1826 if (klass != nullptr && !visitor(klass, arg)) { 1827 return; 1828 } 1829 } 1830 } 1831} 1832 1833ClassLinker::~ClassLinker() { 1834 mirror::Class::ResetClass(); 1835 mirror::String::ResetClass(); 1836 mirror::Reference::ResetClass(); 1837 mirror::ArtField::ResetClass(); 1838 mirror::ArtMethod::ResetClass(); 1839 mirror::BooleanArray::ResetArrayClass(); 1840 mirror::ByteArray::ResetArrayClass(); 1841 mirror::CharArray::ResetArrayClass(); 1842 mirror::DoubleArray::ResetArrayClass(); 1843 mirror::FloatArray::ResetArrayClass(); 1844 mirror::IntArray::ResetArrayClass(); 1845 mirror::LongArray::ResetArrayClass(); 1846 mirror::ShortArray::ResetArrayClass(); 1847 mirror::Throwable::ResetClass(); 1848 mirror::StackTraceElement::ResetClass(); 1849 STLDeleteElements(&boot_class_path_); 1850 STLDeleteElements(&oat_files_); 1851} 1852 1853mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1854 gc::Heap* heap = Runtime::Current()->GetHeap(); 1855 StackHandleScope<16> hs(self); 1856 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1857 Handle<mirror::DexCache> dex_cache( 1858 hs.NewHandle(down_cast<mirror::DexCache*>( 1859 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1860 VoidFunctor())))); 1861 if (dex_cache.Get() == NULL) { 1862 return NULL; 1863 } 1864 Handle<mirror::String> 1865 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1866 if (location.Get() == NULL) { 1867 return NULL; 1868 } 1869 Handle<mirror::ObjectArray<mirror::String>> 1870 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1871 if (strings.Get() == NULL) { 1872 return NULL; 1873 } 1874 Handle<mirror::ObjectArray<mirror::Class>> 1875 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1876 if (types.Get() == NULL) { 1877 return NULL; 1878 } 1879 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1880 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1881 if (methods.Get() == NULL) { 1882 return NULL; 1883 } 1884 Handle<mirror::ObjectArray<mirror::ArtField>> 1885 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1886 if (fields.Get() == NULL) { 1887 return NULL; 1888 } 1889 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1890 fields.Get()); 1891 return dex_cache.Get(); 1892} 1893 1894mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1895 uint32_t class_size) { 1896 DCHECK_GE(class_size, sizeof(mirror::Class)); 1897 gc::Heap* heap = Runtime::Current()->GetHeap(); 1898 mirror::Class::InitializeClassVisitor visitor(class_size); 1899 mirror::Object* k = kMovingClasses ? 1900 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1901 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1902 if (UNLIKELY(k == nullptr)) { 1903 CHECK(self->IsExceptionPending()); // OOME. 1904 return nullptr; 1905 } 1906 return k->AsClass(); 1907} 1908 1909mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1910 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1911} 1912 1913mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1914 return down_cast<mirror::ArtField*>( 1915 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1916} 1917 1918mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1919 return down_cast<mirror::ArtMethod*>( 1920 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1921} 1922 1923mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1924 Thread* self, size_t length) { 1925 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1926 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1927} 1928 1929mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1930 mirror::Class* klass) { 1931 DCHECK(klass != NULL); 1932 1933 // For temporary classes we must wait for them to be retired. 1934 if (init_done_ && klass->IsTemp()) { 1935 CHECK(!klass->IsResolved()); 1936 if (klass->IsErroneous()) { 1937 ThrowEarlierClassFailure(klass); 1938 return nullptr; 1939 } 1940 StackHandleScope<1> hs(self); 1941 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1942 ObjectLock<mirror::Class> lock(self, h_class); 1943 // Loop and wait for the resolving thread to retire this class. 1944 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1945 lock.WaitIgnoringInterrupts(); 1946 } 1947 if (h_class->IsErroneous()) { 1948 ThrowEarlierClassFailure(h_class.Get()); 1949 return nullptr; 1950 } 1951 CHECK(h_class->IsRetired()); 1952 // Get the updated class from class table. 1953 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1954 } 1955 1956 // Wait for the class if it has not already been linked. 1957 if (!klass->IsResolved() && !klass->IsErroneous()) { 1958 StackHandleScope<1> hs(self); 1959 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1960 ObjectLock<mirror::Class> lock(self, h_class); 1961 // Check for circular dependencies between classes. 1962 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1963 ThrowClassCircularityError(h_class.Get()); 1964 h_class->SetStatus(mirror::Class::kStatusError, self); 1965 return nullptr; 1966 } 1967 // Wait for the pending initialization to complete. 1968 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1969 lock.WaitIgnoringInterrupts(); 1970 } 1971 } 1972 1973 if (klass->IsErroneous()) { 1974 ThrowEarlierClassFailure(klass); 1975 return nullptr; 1976 } 1977 // Return the loaded class. No exceptions should be pending. 1978 CHECK(klass->IsResolved()) << PrettyClass(klass); 1979 self->AssertNoPendingException(); 1980 return klass; 1981} 1982 1983typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry; 1984 1985// Search a collection of DexFiles for a descriptor 1986ClassPathEntry FindInClassPath(const char* descriptor, 1987 const std::vector<const DexFile*>& class_path) { 1988 for (size_t i = 0; i != class_path.size(); ++i) { 1989 const DexFile* dex_file = class_path[i]; 1990 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 1991 if (dex_class_def != NULL) { 1992 return ClassPathEntry(dex_file, dex_class_def); 1993 } 1994 } 1995 // TODO: remove reinterpret_cast when issue with -std=gnu++0x host issue resolved 1996 return ClassPathEntry(reinterpret_cast<const DexFile*>(NULL), 1997 reinterpret_cast<const DexFile::ClassDef*>(NULL)); 1998} 1999 2000mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 2001 Handle<mirror::ClassLoader> class_loader) { 2002 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 2003 DCHECK(self != nullptr); 2004 self->AssertNoPendingException(); 2005 if (descriptor[1] == '\0') { 2006 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 2007 // for primitive classes that aren't backed by dex files. 2008 return FindPrimitiveClass(descriptor[0]); 2009 } 2010 // Find the class in the loaded classes table. 2011 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 2012 if (klass != nullptr) { 2013 return EnsureResolved(self, descriptor, klass); 2014 } 2015 // Class is not yet loaded. 2016 if (descriptor[0] == '[') { 2017 return CreateArrayClass(self, descriptor, class_loader); 2018 } else if (class_loader.Get() == nullptr) { 2019 // The boot class loader, search the boot class path. 2020 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2021 if (pair.second != nullptr) { 2022 StackHandleScope<1> hs(self); 2023 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 2024 } else { 2025 // The boot class loader is searched ahead of the application class loader, failures are 2026 // expected and will be wrapped in a ClassNotFoundException. Use the pre-allocated error to 2027 // trigger the chaining with a proper stack trace. 2028 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2029 self->SetException(ThrowLocation(), pre_allocated); 2030 return nullptr; 2031 } 2032 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 2033 // First try with the bootstrap class loader. 2034 if (class_loader.Get() != nullptr) { 2035 klass = LookupClass(descriptor, nullptr); 2036 if (klass != nullptr) { 2037 return EnsureResolved(self, descriptor, klass); 2038 } 2039 } 2040 // If the lookup failed search the boot class path. We don't perform a recursive call to avoid 2041 // a NoClassDefFoundError being allocated. 2042 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2043 if (pair.second != nullptr) { 2044 StackHandleScope<1> hs(self); 2045 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 2046 } 2047 // Next try the compile time class path. 2048 const std::vector<const DexFile*>* class_path; 2049 { 2050 ScopedObjectAccessUnchecked soa(self); 2051 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 2052 soa.AddLocalReference<jobject>(class_loader.Get())); 2053 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 2054 } 2055 pair = FindInClassPath(descriptor, *class_path); 2056 if (pair.second != nullptr) { 2057 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 2058 } 2059 } else { 2060 ScopedObjectAccessUnchecked soa(self); 2061 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 2062 soa.AddLocalReference<jobject>(class_loader.Get())); 2063 std::string class_name_string(DescriptorToDot(descriptor)); 2064 ScopedLocalRef<jobject> result(soa.Env(), nullptr); 2065 { 2066 ScopedThreadStateChange tsc(self, kNative); 2067 ScopedLocalRef<jobject> class_name_object(soa.Env(), 2068 soa.Env()->NewStringUTF(class_name_string.c_str())); 2069 if (class_name_object.get() == nullptr) { 2070 DCHECK(self->IsExceptionPending()); // OOME. 2071 return nullptr; 2072 } 2073 CHECK(class_loader_object.get() != nullptr); 2074 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 2075 WellKnownClasses::java_lang_ClassLoader_loadClass, 2076 class_name_object.get())); 2077 } 2078 if (self->IsExceptionPending()) { 2079 // If the ClassLoader threw, pass that exception up. 2080 return nullptr; 2081 } else if (result.get() == nullptr) { 2082 // broken loader - throw NPE to be compatible with Dalvik 2083 ThrowNullPointerException(nullptr, StringPrintf("ClassLoader.loadClass returned null for %s", 2084 class_name_string.c_str()).c_str()); 2085 return nullptr; 2086 } else { 2087 // success, return mirror::Class* 2088 return soa.Decode<mirror::Class*>(result.get()); 2089 } 2090 } 2091 2092 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 2093 return nullptr; 2094} 2095 2096mirror::Class* ClassLinker::DefineClass(const char* descriptor, 2097 Handle<mirror::ClassLoader> class_loader, 2098 const DexFile& dex_file, 2099 const DexFile::ClassDef& dex_class_def) { 2100 Thread* self = Thread::Current(); 2101 StackHandleScope<3> hs(self); 2102 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2103 bool should_allocate = false; 2104 2105 // Load the class from the dex file. 2106 if (UNLIKELY(!init_done_)) { 2107 // finish up init of hand crafted class_roots_ 2108 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2109 klass.Assign(GetClassRoot(kJavaLangObject)); 2110 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2111 klass.Assign(GetClassRoot(kJavaLangClass)); 2112 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2113 klass.Assign(GetClassRoot(kJavaLangString)); 2114 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2115 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2116 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2117 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2118 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2119 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2120 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2121 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2122 } else { 2123 should_allocate = true; 2124 } 2125 } else { 2126 should_allocate = true; 2127 } 2128 2129 if (should_allocate) { 2130 // Allocate a class with the status of not ready. 2131 // Interface object should get the right size here. Regular class will 2132 // figure out the right size later and be replaced with one of the right 2133 // size when the class becomes resolved. 2134 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2135 } 2136 if (UNLIKELY(klass.Get() == nullptr)) { 2137 CHECK(self->IsExceptionPending()); // Expect an OOME. 2138 return nullptr; 2139 } 2140 klass->SetDexCache(FindDexCache(dex_file)); 2141 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 2142 ObjectLock<mirror::Class> lock(self, klass); 2143 if (self->IsExceptionPending()) { 2144 // An exception occured during load, set status to erroneous while holding klass' lock in case 2145 // notification is necessary. 2146 if (!klass->IsErroneous()) { 2147 klass->SetStatus(mirror::Class::kStatusError, self); 2148 } 2149 return nullptr; 2150 } 2151 klass->SetClinitThreadId(self->GetTid()); 2152 2153 // Add the newly loaded class to the loaded classes table. 2154 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 2155 if (existing != nullptr) { 2156 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2157 // this thread to block. 2158 return EnsureResolved(self, descriptor, existing); 2159 } 2160 2161 // Finish loading (if necessary) by finding parents 2162 CHECK(!klass->IsLoaded()); 2163 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2164 // Loading failed. 2165 if (!klass->IsErroneous()) { 2166 klass->SetStatus(mirror::Class::kStatusError, self); 2167 } 2168 return nullptr; 2169 } 2170 CHECK(klass->IsLoaded()); 2171 // Link the class (if necessary) 2172 CHECK(!klass->IsResolved()); 2173 // TODO: Use fast jobjects? 2174 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2175 2176 mirror::Class* new_class = nullptr; 2177 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2178 // Linking failed. 2179 if (!klass->IsErroneous()) { 2180 klass->SetStatus(mirror::Class::kStatusError, self); 2181 } 2182 return nullptr; 2183 } 2184 self->AssertNoPendingException(); 2185 CHECK(new_class != nullptr) << descriptor; 2186 CHECK(new_class->IsResolved()) << descriptor; 2187 2188 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2189 2190 /* 2191 * We send CLASS_PREPARE events to the debugger from here. The 2192 * definition of "preparation" is creating the static fields for a 2193 * class and initializing them to the standard default values, but not 2194 * executing any code (that comes later, during "initialization"). 2195 * 2196 * We did the static preparation in LinkClass. 2197 * 2198 * The class has been prepared and resolved but possibly not yet verified 2199 * at this point. 2200 */ 2201 Dbg::PostClassPrepare(new_class_h.Get()); 2202 2203 return new_class_h.Get(); 2204} 2205 2206uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2207 const DexFile::ClassDef& dex_class_def) { 2208 const byte* class_data = dex_file.GetClassData(dex_class_def); 2209 size_t num_ref = 0; 2210 size_t num_32 = 0; 2211 size_t num_64 = 0; 2212 if (class_data != NULL) { 2213 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2214 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2215 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2216 char c = descriptor[0]; 2217 if (c == 'L' || c == '[') { 2218 num_ref++; 2219 } else if (c == 'J' || c == 'D') { 2220 num_64++; 2221 } else { 2222 num_32++; 2223 } 2224 } 2225 } 2226 return mirror::Class::ComputeClassSize(false, 0, num_32, num_64, num_ref); 2227} 2228 2229bool ClassLinker::FindOatClass(const DexFile& dex_file, 2230 uint16_t class_def_idx, 2231 OatFile::OatClass* oat_class) { 2232 DCHECK(oat_class != nullptr); 2233 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2234 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2235 if (oat_file == nullptr) { 2236 return false; 2237 } 2238 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2239 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2240 &dex_location_checksum); 2241 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 2242 *oat_class = oat_dex_file->GetOatClass(class_def_idx); 2243 return true; 2244} 2245 2246static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2247 uint32_t method_idx) { 2248 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2249 const byte* class_data = dex_file.GetClassData(class_def); 2250 CHECK(class_data != NULL); 2251 ClassDataItemIterator it(dex_file, class_data); 2252 // Skip fields 2253 while (it.HasNextStaticField()) { 2254 it.Next(); 2255 } 2256 while (it.HasNextInstanceField()) { 2257 it.Next(); 2258 } 2259 // Process methods 2260 size_t class_def_method_index = 0; 2261 while (it.HasNextDirectMethod()) { 2262 if (it.GetMemberIndex() == method_idx) { 2263 return class_def_method_index; 2264 } 2265 class_def_method_index++; 2266 it.Next(); 2267 } 2268 while (it.HasNextVirtualMethod()) { 2269 if (it.GetMemberIndex() == method_idx) { 2270 return class_def_method_index; 2271 } 2272 class_def_method_index++; 2273 it.Next(); 2274 } 2275 DCHECK(!it.HasNext()); 2276 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2277 return 0; 2278} 2279 2280bool ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, OatFile::OatMethod* oat_method) { 2281 DCHECK(oat_method != nullptr); 2282 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2283 // method for direct methods (or virtual methods made direct). 2284 mirror::Class* declaring_class = method->GetDeclaringClass(); 2285 size_t oat_method_index; 2286 if (method->IsStatic() || method->IsDirect()) { 2287 // Simple case where the oat method index was stashed at load time. 2288 oat_method_index = method->GetMethodIndex(); 2289 } else { 2290 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2291 // by search for its position in the declared virtual methods. 2292 oat_method_index = declaring_class->NumDirectMethods(); 2293 size_t end = declaring_class->NumVirtualMethods(); 2294 bool found = false; 2295 for (size_t i = 0; i < end; i++) { 2296 // Check method index instead of identity in case of duplicate method definitions. 2297 if (method->GetDexMethodIndex() == 2298 declaring_class->GetVirtualMethod(i)->GetDexMethodIndex()) { 2299 found = true; 2300 break; 2301 } 2302 oat_method_index++; 2303 } 2304 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2305 } 2306 DCHECK_EQ(oat_method_index, 2307 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2308 method->GetDeclaringClass()->GetDexClassDefIndex(), 2309 method->GetDexMethodIndex())); 2310 OatFile::OatClass oat_class; 2311 if (!FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2312 declaring_class->GetDexClassDefIndex(), 2313 &oat_class)) { 2314 return false; 2315 } 2316 2317 *oat_method = oat_class.GetOatMethod(oat_method_index); 2318 return true; 2319} 2320 2321// Special case to get oat code without overwriting a trampoline. 2322const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2323 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2324 if (method->IsProxyMethod()) { 2325 return GetQuickProxyInvokeHandler(); 2326 } 2327 OatFile::OatMethod oat_method; 2328 const void* result = nullptr; 2329 if (FindOatMethodFor(method, &oat_method)) { 2330 result = oat_method.GetQuickCode(); 2331 } 2332 2333 if (result == nullptr) { 2334 if (method->IsNative()) { 2335 // No code and native? Use generic trampoline. 2336 result = GetQuickGenericJniTrampoline(); 2337 } else if (method->IsPortableCompiled()) { 2338 // No code? Do we expect portable code? 2339 result = GetQuickToPortableBridge(); 2340 } else { 2341 // No code? You must mean to go into the interpreter. 2342 result = GetQuickToInterpreterBridge(); 2343 } 2344 } 2345 return result; 2346} 2347 2348const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2349 bool* have_portable_code) { 2350 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2351 *have_portable_code = false; 2352 if (method->IsProxyMethod()) { 2353 return GetPortableProxyInvokeHandler(); 2354 } 2355 OatFile::OatMethod oat_method; 2356 const void* result = nullptr; 2357 const void* quick_code = nullptr; 2358 if (FindOatMethodFor(method, &oat_method)) { 2359 result = oat_method.GetPortableCode(); 2360 quick_code = oat_method.GetQuickCode(); 2361 } 2362 2363 if (result == nullptr) { 2364 if (quick_code == nullptr) { 2365 // No code? You must mean to go into the interpreter. 2366 result = GetPortableToInterpreterBridge(); 2367 } else { 2368 // No code? But there's quick code, so use a bridge. 2369 result = GetPortableToQuickBridge(); 2370 } 2371 } else { 2372 *have_portable_code = true; 2373 } 2374 return result; 2375} 2376 2377const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2378 uint32_t method_idx) { 2379 OatFile::OatClass oat_class; 2380 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2381 return nullptr; 2382 } 2383 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2384 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2385} 2386 2387const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2388 uint32_t method_idx) { 2389 OatFile::OatClass oat_class; 2390 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2391 return nullptr; 2392 } 2393 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2394 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2395} 2396 2397// Returns true if the method must run with interpreter, false otherwise. 2398static bool NeedsInterpreter( 2399 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2400 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2401 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2402 // No code: need interpreter. 2403 // May return true for native code, in the case of generic JNI 2404 // DCHECK(!method->IsNative()); 2405 return true; 2406 } 2407#ifdef ART_SEA_IR_MODE 2408 ScopedObjectAccess soa(Thread::Current()); 2409 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2410 LOG(INFO) << "Found " << PrettyMethod(method); 2411 return false; 2412 } 2413#endif 2414 // If interpreter mode is enabled, every method (except native and proxy) must 2415 // be run with interpreter. 2416 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2417 !method->IsNative() && !method->IsProxyMethod(); 2418} 2419 2420void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2421 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2422 if (klass->NumDirectMethods() == 0) { 2423 return; // No direct methods => no static methods. 2424 } 2425 Runtime* runtime = Runtime::Current(); 2426 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2427 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2428 return; // OAT file unavailable. 2429 } 2430 } 2431 2432 const DexFile& dex_file = klass->GetDexFile(); 2433 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2434 CHECK(dex_class_def != nullptr); 2435 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2436 // There should always be class data if there were direct methods. 2437 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2438 ClassDataItemIterator it(dex_file, class_data); 2439 // Skip fields 2440 while (it.HasNextStaticField()) { 2441 it.Next(); 2442 } 2443 while (it.HasNextInstanceField()) { 2444 it.Next(); 2445 } 2446 OatFile::OatClass oat_class; 2447 bool has_oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class); 2448 // Link the code of methods skipped by LinkCode. 2449 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2450 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2451 if (!method->IsStatic()) { 2452 // Only update static methods. 2453 continue; 2454 } 2455 const void* portable_code = nullptr; 2456 const void* quick_code = nullptr; 2457 if (has_oat_class) { 2458 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2459 portable_code = oat_method.GetPortableCode(); 2460 quick_code = oat_method.GetQuickCode(); 2461 } 2462 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2463 bool have_portable_code = false; 2464 if (enter_interpreter) { 2465 // Use interpreter entry point. 2466 // Check whether the method is native, in which case it's generic JNI. 2467 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2468 quick_code = GetQuickGenericJniTrampoline(); 2469 portable_code = GetPortableToQuickBridge(); 2470 } else { 2471 portable_code = GetPortableToInterpreterBridge(); 2472 quick_code = GetQuickToInterpreterBridge(); 2473 } 2474 } else { 2475 if (portable_code == nullptr) { 2476 portable_code = GetPortableToQuickBridge(); 2477 } else { 2478 have_portable_code = true; 2479 } 2480 if (quick_code == nullptr) { 2481 quick_code = GetQuickToPortableBridge(); 2482 } 2483 } 2484 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2485 have_portable_code); 2486 } 2487 // Ignore virtual methods on the iterator. 2488} 2489 2490void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 2491 const DexFile& dex_file, uint32_t dex_method_index, 2492 uint32_t method_index) { 2493 if (Runtime::Current()->IsCompiler()) { 2494 // The following code only applies to a non-compiler runtime. 2495 return; 2496 } 2497 // Method shouldn't have already been linked. 2498 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2499 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2500 if (oat_class != nullptr) { 2501 // Every kind of method should at least get an invoke stub from the oat_method. 2502 // non-abstract methods also get their code pointers. 2503 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2504 oat_method.LinkMethod(method.Get()); 2505 } 2506 2507 // Install entry point from interpreter. 2508 bool enter_interpreter = NeedsInterpreter(method.Get(), 2509 method->GetEntryPointFromQuickCompiledCode(), 2510 method->GetEntryPointFromPortableCompiledCode()); 2511 if (enter_interpreter && !method->IsNative()) { 2512 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2513 } else { 2514 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2515 } 2516 2517 if (method->IsAbstract()) { 2518 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2519 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2520 return; 2521 } 2522 2523 bool have_portable_code = false; 2524 if (method->IsStatic() && !method->IsConstructor()) { 2525 // For static methods excluding the class initializer, install the trampoline. 2526 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2527 // after initializing class (see ClassLinker::InitializeClass method). 2528 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2529 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2530 } else if (enter_interpreter) { 2531 if (!method->IsNative()) { 2532 // Set entry point from compiled code if there's no code or in interpreter only mode. 2533 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2534 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2535 } else { 2536 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2537 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2538 } 2539 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2540 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2541 have_portable_code = true; 2542 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2543 } else { 2544 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2545 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2546 } 2547 2548 if (method->IsNative()) { 2549 // Unregistering restores the dlsym lookup stub. 2550 method->UnregisterNative(Thread::Current()); 2551 2552 if (enter_interpreter) { 2553 // We have a native method here without code. Then it should have either the GenericJni 2554 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2555 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2556 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2557 } 2558 } 2559 2560 // Allow instrumentation its chance to hijack code. 2561 Runtime* runtime = Runtime::Current(); 2562 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2563 method->GetEntryPointFromQuickCompiledCode(), 2564 method->GetEntryPointFromPortableCompiledCode(), 2565 have_portable_code); 2566} 2567 2568void ClassLinker::LoadClass(const DexFile& dex_file, 2569 const DexFile::ClassDef& dex_class_def, 2570 Handle<mirror::Class> klass, 2571 mirror::ClassLoader* class_loader) { 2572 CHECK(klass.Get() != NULL); 2573 CHECK(klass->GetDexCache() != NULL); 2574 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2575 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2576 CHECK(descriptor != NULL); 2577 2578 klass->SetClass(GetClassRoot(kJavaLangClass)); 2579 if (kUseBakerOrBrooksReadBarrier) { 2580 klass->AssertReadBarrierPointer(); 2581 } 2582 uint32_t access_flags = dex_class_def.access_flags_; 2583 // Make sure that none of our runtime-only flags are set. 2584 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2585 klass->SetAccessFlags(access_flags); 2586 klass->SetClassLoader(class_loader); 2587 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2588 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2589 2590 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2591 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2592 2593 const byte* class_data = dex_file.GetClassData(dex_class_def); 2594 if (class_data == NULL) { 2595 return; // no fields or methods - for example a marker interface 2596 } 2597 2598 OatFile::OatClass oat_class; 2599 if (Runtime::Current()->IsStarted() 2600 && !Runtime::Current()->UseCompileTimeClassPath() 2601 && FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class)) { 2602 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2603 } else { 2604 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2605 } 2606} 2607 2608void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2609 const byte* class_data, 2610 Handle<mirror::Class> klass, 2611 mirror::ClassLoader* class_loader, 2612 const OatFile::OatClass* oat_class) { 2613 // Load fields. 2614 ClassDataItemIterator it(dex_file, class_data); 2615 Thread* self = Thread::Current(); 2616 if (it.NumStaticFields() != 0) { 2617 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2618 if (UNLIKELY(statics == NULL)) { 2619 CHECK(self->IsExceptionPending()); // OOME. 2620 return; 2621 } 2622 klass->SetSFields(statics); 2623 } 2624 if (it.NumInstanceFields() != 0) { 2625 mirror::ObjectArray<mirror::ArtField>* fields = 2626 AllocArtFieldArray(self, it.NumInstanceFields()); 2627 if (UNLIKELY(fields == NULL)) { 2628 CHECK(self->IsExceptionPending()); // OOME. 2629 return; 2630 } 2631 klass->SetIFields(fields); 2632 } 2633 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2634 StackHandleScope<1> hs(self); 2635 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2636 if (UNLIKELY(sfield.Get() == NULL)) { 2637 CHECK(self->IsExceptionPending()); // OOME. 2638 return; 2639 } 2640 klass->SetStaticField(i, sfield.Get()); 2641 LoadField(dex_file, it, klass, sfield); 2642 } 2643 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2644 StackHandleScope<1> hs(self); 2645 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2646 if (UNLIKELY(ifield.Get() == NULL)) { 2647 CHECK(self->IsExceptionPending()); // OOME. 2648 return; 2649 } 2650 klass->SetInstanceField(i, ifield.Get()); 2651 LoadField(dex_file, it, klass, ifield); 2652 } 2653 2654 // Load methods. 2655 if (it.NumDirectMethods() != 0) { 2656 // TODO: append direct methods to class object 2657 mirror::ObjectArray<mirror::ArtMethod>* directs = 2658 AllocArtMethodArray(self, it.NumDirectMethods()); 2659 if (UNLIKELY(directs == NULL)) { 2660 CHECK(self->IsExceptionPending()); // OOME. 2661 return; 2662 } 2663 klass->SetDirectMethods(directs); 2664 } 2665 if (it.NumVirtualMethods() != 0) { 2666 // TODO: append direct methods to class object 2667 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2668 AllocArtMethodArray(self, it.NumVirtualMethods()); 2669 if (UNLIKELY(virtuals == NULL)) { 2670 CHECK(self->IsExceptionPending()); // OOME. 2671 return; 2672 } 2673 klass->SetVirtualMethods(virtuals); 2674 } 2675 size_t class_def_method_index = 0; 2676 uint32_t last_dex_method_index = DexFile::kDexNoIndex; 2677 size_t last_class_def_method_index = 0; 2678 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2679 StackHandleScope<1> hs(self); 2680 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2681 if (UNLIKELY(method.Get() == NULL)) { 2682 CHECK(self->IsExceptionPending()); // OOME. 2683 return; 2684 } 2685 klass->SetDirectMethod(i, method.Get()); 2686 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2687 uint32_t it_method_index = it.GetMemberIndex(); 2688 if (last_dex_method_index == it_method_index) { 2689 // duplicate case 2690 method->SetMethodIndex(last_class_def_method_index); 2691 } else { 2692 method->SetMethodIndex(class_def_method_index); 2693 last_dex_method_index = it_method_index; 2694 last_class_def_method_index = class_def_method_index; 2695 } 2696 class_def_method_index++; 2697 } 2698 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2699 StackHandleScope<1> hs(self); 2700 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2701 if (UNLIKELY(method.Get() == NULL)) { 2702 CHECK(self->IsExceptionPending()); // OOME. 2703 return; 2704 } 2705 klass->SetVirtualMethod(i, method.Get()); 2706 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2707 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2708 class_def_method_index++; 2709 } 2710 DCHECK(!it.HasNext()); 2711} 2712 2713void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2714 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2715 uint32_t field_idx = it.GetMemberIndex(); 2716 dst->SetDexFieldIndex(field_idx); 2717 dst->SetDeclaringClass(klass.Get()); 2718 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2719} 2720 2721mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2722 const ClassDataItemIterator& it, 2723 Handle<mirror::Class> klass) { 2724 uint32_t dex_method_idx = it.GetMemberIndex(); 2725 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2726 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2727 2728 mirror::ArtMethod* dst = AllocArtMethod(self); 2729 if (UNLIKELY(dst == NULL)) { 2730 CHECK(self->IsExceptionPending()); // OOME. 2731 return NULL; 2732 } 2733 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2734 2735 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2736 dst->SetDexMethodIndex(dex_method_idx); 2737 dst->SetDeclaringClass(klass.Get()); 2738 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2739 2740 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2741 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2742 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2743 2744 uint32_t access_flags = it.GetMemberAccessFlags(); 2745 2746 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2747 // Set finalizable flag on declaring class. 2748 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2749 // Void return type. 2750 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged. 2751 klass->SetFinalizable(); 2752 } else { 2753 std::string temp; 2754 const char* klass_descriptor = klass->GetDescriptor(&temp); 2755 // The Enum class declares a "final" finalize() method to prevent subclasses from 2756 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2757 // subclasses, so we exclude it here. 2758 // We also want to avoid setting the flag on Object, where we know that finalize() is 2759 // empty. 2760 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2761 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2762 klass->SetFinalizable(); 2763 } 2764 } 2765 } 2766 } else if (method_name[0] == '<') { 2767 // Fix broken access flags for initializers. Bug 11157540. 2768 bool is_init = (strcmp("<init>", method_name) == 0); 2769 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2770 if (UNLIKELY(!is_init && !is_clinit)) { 2771 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2772 } else { 2773 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2774 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2775 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2776 access_flags |= kAccConstructor; 2777 } 2778 } 2779 } 2780 dst->SetAccessFlags(access_flags); 2781 2782 self->EndAssertNoThreadSuspension(old_cause); 2783 return dst; 2784} 2785 2786void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2787 Thread* self = Thread::Current(); 2788 StackHandleScope<1> hs(self); 2789 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2790 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2791 AppendToBootClassPath(dex_file, dex_cache); 2792} 2793 2794void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2795 Handle<mirror::DexCache> dex_cache) { 2796 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2797 boot_class_path_.push_back(&dex_file); 2798 RegisterDexFile(dex_file, dex_cache); 2799} 2800 2801bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2802 dex_lock_.AssertSharedHeld(Thread::Current()); 2803 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2804 mirror::DexCache* dex_cache = GetDexCache(i); 2805 if (dex_cache->GetDexFile() == &dex_file) { 2806 return true; 2807 } 2808 } 2809 return false; 2810} 2811 2812bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2813 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2814 return IsDexFileRegisteredLocked(dex_file); 2815} 2816 2817void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2818 Handle<mirror::DexCache> dex_cache) { 2819 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2820 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2821 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2822 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2823 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2824 dex_cache->SetDexFile(&dex_file); 2825 if (log_new_dex_caches_roots_) { 2826 // TODO: This is not safe if we can remove dex caches. 2827 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2828 } 2829} 2830 2831void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2832 Thread* self = Thread::Current(); 2833 { 2834 ReaderMutexLock mu(self, dex_lock_); 2835 if (IsDexFileRegisteredLocked(dex_file)) { 2836 return; 2837 } 2838 } 2839 // Don't alloc while holding the lock, since allocation may need to 2840 // suspend all threads and another thread may need the dex_lock_ to 2841 // get to a suspend point. 2842 StackHandleScope<1> hs(self); 2843 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2844 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2845 { 2846 WriterMutexLock mu(self, dex_lock_); 2847 if (IsDexFileRegisteredLocked(dex_file)) { 2848 return; 2849 } 2850 RegisterDexFileLocked(dex_file, dex_cache); 2851 } 2852} 2853 2854void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2855 Handle<mirror::DexCache> dex_cache) { 2856 WriterMutexLock mu(Thread::Current(), dex_lock_); 2857 RegisterDexFileLocked(dex_file, dex_cache); 2858} 2859 2860mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2861 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2862 // Search assuming unique-ness of dex file. 2863 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2864 mirror::DexCache* dex_cache = GetDexCache(i); 2865 if (dex_cache->GetDexFile() == &dex_file) { 2866 return dex_cache; 2867 } 2868 } 2869 // Search matching by location name. 2870 std::string location(dex_file.GetLocation()); 2871 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2872 mirror::DexCache* dex_cache = GetDexCache(i); 2873 if (dex_cache->GetDexFile()->GetLocation() == location) { 2874 return dex_cache; 2875 } 2876 } 2877 // Failure, dump diagnostic and abort. 2878 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2879 mirror::DexCache* dex_cache = GetDexCache(i); 2880 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2881 } 2882 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2883 return NULL; 2884} 2885 2886void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2887 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2888 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2889 mirror::DexCache* dex_cache = GetDexCache(i); 2890 dex_cache->Fixup(resolution_method); 2891 } 2892} 2893 2894mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2895 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 2896 if (UNLIKELY(klass == NULL)) { 2897 return NULL; 2898 } 2899 return InitializePrimitiveClass(klass, type); 2900} 2901 2902mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2903 Primitive::Type type) { 2904 CHECK(primitive_class != NULL); 2905 // Must hold lock on object when initializing. 2906 Thread* self = Thread::Current(); 2907 StackHandleScope<1> hs(self); 2908 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2909 ObjectLock<mirror::Class> lock(self, h_class); 2910 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2911 primitive_class->SetPrimitiveType(type); 2912 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2913 const char* descriptor = Primitive::Descriptor(type); 2914 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2915 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2916 return primitive_class; 2917} 2918 2919// Create an array class (i.e. the class object for the array, not the 2920// array itself). "descriptor" looks like "[C" or "[[[[B" or 2921// "[Ljava/lang/String;". 2922// 2923// If "descriptor" refers to an array of primitives, look up the 2924// primitive type's internally-generated class object. 2925// 2926// "class_loader" is the class loader of the class that's referring to 2927// us. It's used to ensure that we're looking for the element type in 2928// the right context. It does NOT become the class loader for the 2929// array class; that always comes from the base element class. 2930// 2931// Returns NULL with an exception raised on failure. 2932mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2933 Handle<mirror::ClassLoader> class_loader) { 2934 // Identify the underlying component type 2935 CHECK_EQ('[', descriptor[0]); 2936 StackHandleScope<2> hs(self); 2937 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2938 if (component_type.Get() == nullptr) { 2939 DCHECK(self->IsExceptionPending()); 2940 // We need to accept erroneous classes as component types. 2941 component_type.Assign(LookupClass(descriptor + 1, class_loader.Get())); 2942 if (component_type.Get() == nullptr) { 2943 DCHECK(self->IsExceptionPending()); 2944 return nullptr; 2945 } else { 2946 self->ClearException(); 2947 } 2948 } 2949 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2950 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2951 return nullptr; 2952 } 2953 // See if the component type is already loaded. Array classes are 2954 // always associated with the class loader of their underlying 2955 // element type -- an array of Strings goes with the loader for 2956 // java/lang/String -- so we need to look for it there. (The 2957 // caller should have checked for the existence of the class 2958 // before calling here, but they did so with *their* class loader, 2959 // not the component type's loader.) 2960 // 2961 // If we find it, the caller adds "loader" to the class' initiating 2962 // loader list, which should prevent us from going through this again. 2963 // 2964 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2965 // are the same, because our caller (FindClass) just did the 2966 // lookup. (Even if we get this wrong we still have correct behavior, 2967 // because we effectively do this lookup again when we add the new 2968 // class to the hash table --- necessary because of possible races with 2969 // other threads.) 2970 if (class_loader.Get() != component_type->GetClassLoader()) { 2971 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2972 if (new_class != NULL) { 2973 return new_class; 2974 } 2975 } 2976 2977 // Fill out the fields in the Class. 2978 // 2979 // It is possible to execute some methods against arrays, because 2980 // all arrays are subclasses of java_lang_Object_, so we need to set 2981 // up a vtable. We can just point at the one in java_lang_Object_. 2982 // 2983 // Array classes are simple enough that we don't need to do a full 2984 // link step. 2985 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2986 if (UNLIKELY(!init_done_)) { 2987 // Classes that were hand created, ie not by FindSystemClass 2988 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2989 new_class.Assign(GetClassRoot(kClassArrayClass)); 2990 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2991 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2992 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2993 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2994 } else if (strcmp(descriptor, 2995 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2996 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2997 } else if (strcmp(descriptor, 2998 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2999 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 3000 } else if (strcmp(descriptor, "[C") == 0) { 3001 new_class.Assign(GetClassRoot(kCharArrayClass)); 3002 } else if (strcmp(descriptor, "[I") == 0) { 3003 new_class.Assign(GetClassRoot(kIntArrayClass)); 3004 } 3005 } 3006 if (new_class.Get() == nullptr) { 3007 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 3008 if (new_class.Get() == nullptr) { 3009 return nullptr; 3010 } 3011 new_class->SetComponentType(component_type.Get()); 3012 } 3013 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 3014 DCHECK(new_class->GetComponentType() != NULL); 3015 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 3016 new_class->SetSuperClass(java_lang_Object); 3017 new_class->SetVTable(java_lang_Object->GetVTable()); 3018 new_class->SetPrimitiveType(Primitive::kPrimNot); 3019 new_class->SetClassLoader(component_type->GetClassLoader()); 3020 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 3021 new_class->PopulateEmbeddedImtAndVTable(); 3022 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 3023 // don't need to set new_class->SetObjectSize(..) 3024 // because Object::SizeOf delegates to Array::SizeOf 3025 3026 3027 // All arrays have java/lang/Cloneable and java/io/Serializable as 3028 // interfaces. We need to set that up here, so that stuff like 3029 // "instanceof" works right. 3030 // 3031 // Note: The GC could run during the call to FindSystemClass, 3032 // so we need to make sure the class object is GC-valid while we're in 3033 // there. Do this by clearing the interface list so the GC will just 3034 // think that the entries are null. 3035 3036 3037 // Use the single, global copies of "interfaces" and "iftable" 3038 // (remember not to free them for arrays). 3039 { 3040 mirror::IfTable* array_iftable = array_iftable_.Read(); 3041 CHECK(array_iftable != nullptr); 3042 new_class->SetIfTable(array_iftable); 3043 } 3044 3045 // Inherit access flags from the component type. 3046 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 3047 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 3048 access_flags &= kAccJavaFlagsMask; 3049 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 3050 // and remove "interface". 3051 access_flags |= kAccAbstract | kAccFinal; 3052 access_flags &= ~kAccInterface; 3053 3054 new_class->SetAccessFlags(access_flags); 3055 3056 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 3057 if (existing == nullptr) { 3058 return new_class.Get(); 3059 } 3060 // Another thread must have loaded the class after we 3061 // started but before we finished. Abandon what we've 3062 // done. 3063 // 3064 // (Yes, this happens.) 3065 3066 return existing; 3067} 3068 3069mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 3070 switch (type) { 3071 case 'B': 3072 return GetClassRoot(kPrimitiveByte); 3073 case 'C': 3074 return GetClassRoot(kPrimitiveChar); 3075 case 'D': 3076 return GetClassRoot(kPrimitiveDouble); 3077 case 'F': 3078 return GetClassRoot(kPrimitiveFloat); 3079 case 'I': 3080 return GetClassRoot(kPrimitiveInt); 3081 case 'J': 3082 return GetClassRoot(kPrimitiveLong); 3083 case 'S': 3084 return GetClassRoot(kPrimitiveShort); 3085 case 'Z': 3086 return GetClassRoot(kPrimitiveBoolean); 3087 case 'V': 3088 return GetClassRoot(kPrimitiveVoid); 3089 default: 3090 break; 3091 } 3092 std::string printable_type(PrintableChar(type)); 3093 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 3094 return NULL; 3095} 3096 3097mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 3098 size_t hash) { 3099 if (VLOG_IS_ON(class_linker)) { 3100 mirror::DexCache* dex_cache = klass->GetDexCache(); 3101 std::string source; 3102 if (dex_cache != NULL) { 3103 source += " from "; 3104 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3105 } 3106 LOG(INFO) << "Loaded class " << descriptor << source; 3107 } 3108 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3109 mirror::Class* existing = 3110 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3111 if (existing != NULL) { 3112 return existing; 3113 } 3114 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == NULL && 3115 dex_cache_image_class_lookup_required_) { 3116 // Check a class loaded with the system class loader matches one in the image if the class 3117 // is in the image. 3118 existing = LookupClassFromImage(descriptor); 3119 if (existing != NULL) { 3120 CHECK(klass == existing); 3121 } 3122 } 3123 VerifyObject(klass); 3124 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3125 if (log_new_class_table_roots_) { 3126 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3127 } 3128 return NULL; 3129} 3130 3131mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3132 size_t hash) { 3133 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3134 mirror::Class* existing = 3135 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3136 3137 if (existing == nullptr) { 3138 CHECK(klass->IsProxyClass()); 3139 return nullptr; 3140 } 3141 3142 CHECK_NE(existing, klass) << descriptor; 3143 CHECK(!existing->IsResolved()) << descriptor; 3144 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3145 3146 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 3147 ++it) { 3148 mirror::Class* klass = it->second.Read(); 3149 if (klass == existing) { 3150 class_table_.erase(it); 3151 break; 3152 } 3153 } 3154 3155 CHECK(!klass->IsTemp()) << descriptor; 3156 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3157 dex_cache_image_class_lookup_required_) { 3158 // Check a class loaded with the system class loader matches one in the image if the class 3159 // is in the image. 3160 existing = LookupClassFromImage(descriptor); 3161 if (existing != nullptr) { 3162 CHECK(klass == existing) << descriptor; 3163 } 3164 } 3165 VerifyObject(klass); 3166 3167 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3168 if (log_new_class_table_roots_) { 3169 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3170 } 3171 3172 return existing; 3173} 3174 3175bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 3176 size_t hash = Hash(descriptor); 3177 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3178 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3179 it != end && it->first == hash; 3180 ++it) { 3181 mirror::Class* klass = it->second.Read(); 3182 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3183 class_table_.erase(it); 3184 return true; 3185 } 3186 } 3187 return false; 3188} 3189 3190mirror::Class* ClassLinker::LookupClass(const char* descriptor, 3191 const mirror::ClassLoader* class_loader) { 3192 size_t hash = Hash(descriptor); 3193 { 3194 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3195 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3196 if (result != NULL) { 3197 return result; 3198 } 3199 } 3200 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 3201 return NULL; 3202 } else { 3203 // Lookup failed but need to search dex_caches_. 3204 mirror::Class* result = LookupClassFromImage(descriptor); 3205 if (result != NULL) { 3206 InsertClass(descriptor, result, hash); 3207 } else { 3208 // Searching the image dex files/caches failed, we don't want to get into this situation 3209 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3210 // classes into the class table. 3211 constexpr uint32_t kMaxFailedDexCacheLookups = 1000; 3212 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3213 MoveImageClassesToClassTable(); 3214 } 3215 } 3216 return result; 3217 } 3218} 3219 3220mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3221 const mirror::ClassLoader* class_loader, 3222 size_t hash) { 3223 auto end = class_table_.end(); 3224 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3225 mirror::Class* klass = it->second.Read(); 3226 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3227 if (kIsDebugBuild) { 3228 // Check for duplicates in the table. 3229 for (++it; it != end && it->first == hash; ++it) { 3230 mirror::Class* klass2 = it->second.Read(); 3231 CHECK(!(klass2->GetClassLoader() == class_loader && 3232 klass2->DescriptorEquals(descriptor))) 3233 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3234 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3235 } 3236 } 3237 return klass; 3238 } 3239 } 3240 return NULL; 3241} 3242 3243static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3244 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3245 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3246 CHECK(image != NULL); 3247 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3248 return root->AsObjectArray<mirror::DexCache>(); 3249} 3250 3251void ClassLinker::MoveImageClassesToClassTable() { 3252 Thread* self = Thread::Current(); 3253 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3254 if (!dex_cache_image_class_lookup_required_) { 3255 return; // All dex cache classes are already in the class table. 3256 } 3257 const char* old_no_suspend_cause = 3258 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 3259 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3260 std::string temp; 3261 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3262 mirror::DexCache* dex_cache = dex_caches->Get(i); 3263 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3264 for (int32_t j = 0; j < types->GetLength(); j++) { 3265 mirror::Class* klass = types->Get(j); 3266 if (klass != NULL) { 3267 DCHECK(klass->GetClassLoader() == NULL); 3268 const char* descriptor = klass->GetDescriptor(&temp); 3269 size_t hash = Hash(descriptor); 3270 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 3271 if (existing != NULL) { 3272 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3273 << PrettyClassAndClassLoader(klass); 3274 } else { 3275 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3276 if (log_new_class_table_roots_) { 3277 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3278 } 3279 } 3280 } 3281 } 3282 } 3283 dex_cache_image_class_lookup_required_ = false; 3284 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3285} 3286 3287mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3288 Thread* self = Thread::Current(); 3289 const char* old_no_suspend_cause = 3290 self->StartAssertNoThreadSuspension("Image class lookup"); 3291 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3292 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3293 mirror::DexCache* dex_cache = dex_caches->Get(i); 3294 const DexFile* dex_file = dex_cache->GetDexFile(); 3295 // Try binary searching the string/type index. 3296 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3297 if (string_id != NULL) { 3298 const DexFile::TypeId* type_id = 3299 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3300 if (type_id != NULL) { 3301 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3302 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3303 if (klass != NULL) { 3304 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3305 return klass; 3306 } 3307 } 3308 } 3309 } 3310 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3311 return NULL; 3312} 3313 3314void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3315 result.clear(); 3316 if (dex_cache_image_class_lookup_required_) { 3317 MoveImageClassesToClassTable(); 3318 } 3319 size_t hash = Hash(descriptor); 3320 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3321 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3322 it != end && it->first == hash; ++it) { 3323 mirror::Class* klass = it->second.Read(); 3324 if (klass->DescriptorEquals(descriptor)) { 3325 result.push_back(klass); 3326 } 3327 } 3328} 3329 3330void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 3331 // TODO: assert that the monitor on the Class is held 3332 Thread* self = Thread::Current(); 3333 ObjectLock<mirror::Class> lock(self, klass); 3334 3335 // Don't attempt to re-verify if already sufficiently verified. 3336 if (klass->IsVerified() || 3337 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 3338 return; 3339 } 3340 3341 // The class might already be erroneous, for example at compile time if we attempted to verify 3342 // this class as a parent to another. 3343 if (klass->IsErroneous()) { 3344 ThrowEarlierClassFailure(klass.Get()); 3345 return; 3346 } 3347 3348 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3349 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3350 } else { 3351 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3352 << PrettyClass(klass.Get()); 3353 CHECK(!Runtime::Current()->IsCompiler()); 3354 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3355 } 3356 3357 // Skip verification if disabled. 3358 if (!Runtime::Current()->IsVerificationEnabled()) { 3359 klass->SetStatus(mirror::Class::kStatusVerified, self); 3360 return; 3361 } 3362 3363 // Verify super class. 3364 StackHandleScope<2> hs(self); 3365 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3366 if (super.Get() != NULL) { 3367 // Acquire lock to prevent races on verifying the super class. 3368 ObjectLock<mirror::Class> lock(self, super); 3369 3370 if (!super->IsVerified() && !super->IsErroneous()) { 3371 VerifyClass(super); 3372 } 3373 if (!super->IsCompileTimeVerified()) { 3374 std::string error_msg( 3375 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3376 PrettyDescriptor(klass.Get()).c_str(), 3377 PrettyDescriptor(super.Get()).c_str())); 3378 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3379 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3380 if (cause.Get() != nullptr) { 3381 self->ClearException(); 3382 } 3383 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3384 if (cause.Get() != nullptr) { 3385 self->GetException(nullptr)->SetCause(cause.Get()); 3386 } 3387 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3388 if (Runtime::Current()->IsCompiler()) { 3389 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3390 } 3391 klass->SetStatus(mirror::Class::kStatusError, self); 3392 return; 3393 } 3394 } 3395 3396 // Try to use verification information from the oat file, otherwise do runtime verification. 3397 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3398 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3399 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3400 if (oat_file_class_status == mirror::Class::kStatusError) { 3401 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3402 << PrettyDescriptor(klass.Get()) << " in " 3403 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3404 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3405 PrettyDescriptor(klass.Get()).c_str()); 3406 klass->SetStatus(mirror::Class::kStatusError, self); 3407 return; 3408 } 3409 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3410 std::string error_msg; 3411 if (!preverified) { 3412 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 3413 Runtime::Current()->IsCompiler(), 3414 &error_msg); 3415 } 3416 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3417 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3418 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3419 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3420 << " because: " << error_msg; 3421 } 3422 self->AssertNoPendingException(); 3423 // Make sure all classes referenced by catch blocks are resolved. 3424 ResolveClassExceptionHandlerTypes(dex_file, klass); 3425 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3426 // Even though there were no verifier failures we need to respect whether the super-class 3427 // was verified or requiring runtime reverification. 3428 if (super.Get() == NULL || super->IsVerified()) { 3429 klass->SetStatus(mirror::Class::kStatusVerified, self); 3430 } else { 3431 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3432 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3433 // Pretend a soft failure occured so that we don't consider the class verified below. 3434 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3435 } 3436 } else { 3437 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3438 // Soft failures at compile time should be retried at runtime. Soft 3439 // failures at runtime will be handled by slow paths in the generated 3440 // code. Set status accordingly. 3441 if (Runtime::Current()->IsCompiler()) { 3442 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3443 } else { 3444 klass->SetStatus(mirror::Class::kStatusVerified, self); 3445 } 3446 } 3447 } else { 3448 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3449 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3450 << " because: " << error_msg; 3451 self->AssertNoPendingException(); 3452 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3453 klass->SetStatus(mirror::Class::kStatusError, self); 3454 } 3455 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3456 // Class is verified so we don't need to do any access check on its methods. 3457 // Let the interpreter know it by setting the kAccPreverified flag onto each 3458 // method. 3459 // Note: we're going here during compilation and at runtime. When we set the 3460 // kAccPreverified flag when compiling image classes, the flag is recorded 3461 // in the image and is set when loading the image. 3462 klass->SetPreverifiedFlagOnAllMethods(); 3463 } 3464} 3465 3466bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3467 mirror::Class::Status& oat_file_class_status) { 3468 // If we're compiling, we can only verify the class using the oat file if 3469 // we are not compiling the image or if the class we're verifying is not part of 3470 // the app. In other words, we will only check for preverification of bootclasspath 3471 // classes. 3472 if (Runtime::Current()->IsCompiler()) { 3473 // Are we compiling the bootclasspath? 3474 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3475 return false; 3476 } 3477 // We are compiling an app (not the image). 3478 3479 // Is this an app class? (I.e. not a bootclasspath class) 3480 if (klass->GetClassLoader() != NULL) { 3481 return false; 3482 } 3483 } 3484 3485 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 3486 // Make this work with gtests, which do not set up the image properly. 3487 // TODO: we should clean up gtests to set up the image path properly. 3488 if (Runtime::Current()->IsCompiler() || (oat_file == NULL)) { 3489 return false; 3490 } 3491 3492 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3493 uint dex_location_checksum = dex_file.GetLocationChecksum(); 3494 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 3495 &dex_location_checksum); 3496 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3497 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3498 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3499 if (oat_file_class_status == mirror::Class::kStatusVerified || 3500 oat_file_class_status == mirror::Class::kStatusInitialized) { 3501 return true; 3502 } 3503 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3504 // Compile time verification failed with a soft error. Compile time verification can fail 3505 // because we have incomplete type information. Consider the following: 3506 // class ... { 3507 // Foo x; 3508 // .... () { 3509 // if (...) { 3510 // v1 gets assigned a type of resolved class Foo 3511 // } else { 3512 // v1 gets assigned a type of unresolved class Bar 3513 // } 3514 // iput x = v1 3515 // } } 3516 // when we merge v1 following the if-the-else it results in Conflict 3517 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3518 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3519 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3520 // at compile time). 3521 return false; 3522 } 3523 if (oat_file_class_status == mirror::Class::kStatusError) { 3524 // Compile time verification failed with a hard error. This is caused by invalid instructions 3525 // in the class. These errors are unrecoverable. 3526 return false; 3527 } 3528 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3529 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3530 // not loading the class. 3531 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3532 // isn't a problem and this case shouldn't occur 3533 return false; 3534 } 3535 std::string temp; 3536 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3537 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3538 << klass->GetDescriptor(&temp); 3539 3540 return false; 3541} 3542 3543void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3544 Handle<mirror::Class> klass) { 3545 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3546 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3547 } 3548 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3549 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3550 } 3551} 3552 3553void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3554 mirror::ArtMethod* method) { 3555 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3556 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3557 if (code_item == NULL) { 3558 return; // native or abstract method 3559 } 3560 if (code_item->tries_size_ == 0) { 3561 return; // nothing to process 3562 } 3563 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3564 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3565 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3566 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3567 CatchHandlerIterator iterator(handlers_ptr); 3568 for (; iterator.HasNext(); iterator.Next()) { 3569 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3570 // unresolved exception types will be ignored by exception delivery 3571 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3572 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3573 if (exception_type == NULL) { 3574 DCHECK(Thread::Current()->IsExceptionPending()); 3575 Thread::Current()->ClearException(); 3576 } 3577 } 3578 } 3579 handlers_ptr = iterator.EndDataPointer(); 3580 } 3581} 3582 3583static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3584static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3585 Handle<mirror::ArtMethod> prototype); 3586 3587mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3588 jobjectArray interfaces, jobject loader, 3589 jobjectArray methods, jobjectArray throws) { 3590 Thread* self = soa.Self(); 3591 StackHandleScope<8> hs(self); 3592 Handle<mirror::Class> klass(hs.NewHandle( 3593 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3594 if (klass.Get() == NULL) { 3595 CHECK(self->IsExceptionPending()); // OOME. 3596 return NULL; 3597 } 3598 DCHECK(klass->GetClass() != NULL); 3599 klass->SetObjectSize(sizeof(mirror::Proxy)); 3600 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 3601 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3602 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3603 klass->SetName(soa.Decode<mirror::String*>(name)); 3604 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3605 klass->SetDexCache(proxy_class->GetDexCache()); 3606 klass->SetStatus(mirror::Class::kStatusIdx, self); 3607 3608 // Instance fields are inherited, but we add a couple of static fields... 3609 { 3610 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3611 if (UNLIKELY(sfields == NULL)) { 3612 CHECK(self->IsExceptionPending()); // OOME. 3613 return NULL; 3614 } 3615 klass->SetSFields(sfields); 3616 } 3617 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3618 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3619 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3620 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3621 CHECK(self->IsExceptionPending()); // OOME. 3622 return nullptr; 3623 } 3624 klass->SetStaticField(0, interfaces_sfield.Get()); 3625 interfaces_sfield->SetDexFieldIndex(0); 3626 interfaces_sfield->SetDeclaringClass(klass.Get()); 3627 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3628 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3629 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3630 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3631 CHECK(self->IsExceptionPending()); // OOME. 3632 return nullptr; 3633 } 3634 klass->SetStaticField(1, throws_sfield.Get()); 3635 throws_sfield->SetDexFieldIndex(1); 3636 throws_sfield->SetDeclaringClass(klass.Get()); 3637 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3638 3639 // Proxies have 1 direct method, the constructor 3640 { 3641 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3642 if (UNLIKELY(directs == nullptr)) { 3643 CHECK(self->IsExceptionPending()); // OOME. 3644 return nullptr; 3645 } 3646 klass->SetDirectMethods(directs); 3647 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3648 if (UNLIKELY(constructor == nullptr)) { 3649 CHECK(self->IsExceptionPending()); // OOME. 3650 return nullptr; 3651 } 3652 klass->SetDirectMethod(0, constructor); 3653 } 3654 3655 // Create virtual method using specified prototypes. 3656 size_t num_virtual_methods = 3657 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3658 { 3659 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3660 num_virtual_methods); 3661 if (UNLIKELY(virtuals == NULL)) { 3662 CHECK(self->IsExceptionPending()); // OOME. 3663 return NULL; 3664 } 3665 klass->SetVirtualMethods(virtuals); 3666 } 3667 for (size_t i = 0; i < num_virtual_methods; ++i) { 3668 StackHandleScope<1> hs(self); 3669 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3670 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3671 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3672 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3673 if (UNLIKELY(clone == nullptr)) { 3674 CHECK(self->IsExceptionPending()); // OOME. 3675 return nullptr; 3676 } 3677 klass->SetVirtualMethod(i, clone); 3678 } 3679 3680 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3681 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3682 self->AssertNoPendingException(); 3683 3684 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3685 mirror::Class* new_class = nullptr; 3686 { 3687 ObjectLock<mirror::Class> resolution_lock(self, klass); // Must hold lock on object when resolved. 3688 // Link the fields and virtual methods, creating vtable and iftables 3689 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3690 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3691 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3692 klass->SetStatus(mirror::Class::kStatusError, self); 3693 return nullptr; 3694 } 3695 } 3696 3697 CHECK(klass->IsRetired()); 3698 CHECK_NE(klass.Get(), new_class); 3699 klass.Assign(new_class); 3700 3701 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3702 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3703 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3704 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3705 3706 { 3707 // Lock on klass is released. Lock new class object. 3708 ObjectLock<mirror::Class> initialization_lock(self, klass); 3709 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3710 } 3711 3712 // sanity checks 3713 if (kIsDebugBuild) { 3714 CHECK(klass->GetIFields() == nullptr); 3715 CheckProxyConstructor(klass->GetDirectMethod(0)); 3716 for (size_t i = 0; i < num_virtual_methods; ++i) { 3717 StackHandleScope<2> hs(self); 3718 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3719 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3720 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3721 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3722 CheckProxyMethod(virtual_method, prototype); 3723 } 3724 3725 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3726 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3727 decoded_name->ToModifiedUtf8().c_str())); 3728 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3729 3730 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3731 decoded_name->ToModifiedUtf8().c_str())); 3732 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3733 3734 CHECK_EQ(klass.Get()->GetInterfaces(), 3735 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3736 CHECK_EQ(klass.Get()->GetThrows(), 3737 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3738 } 3739 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3740 CHECK(existing == nullptr); 3741 return klass.Get(); 3742} 3743 3744std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3745 DCHECK(proxy_class->IsProxyClass()); 3746 mirror::String* name = proxy_class->GetName(); 3747 DCHECK(name != NULL); 3748 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3749} 3750 3751mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3752 mirror::ArtMethod* proxy_method) { 3753 DCHECK(proxy_class->IsProxyClass()); 3754 DCHECK(proxy_method->IsProxyMethod()); 3755 // Locate the dex cache of the original interface/Object 3756 mirror::DexCache* dex_cache = nullptr; 3757 { 3758 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3759 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3760 mirror::DexCache* a_dex_cache = GetDexCache(i); 3761 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3762 dex_cache = a_dex_cache; 3763 break; 3764 } 3765 } 3766 } 3767 CHECK(dex_cache != nullptr); 3768 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3769 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3770 CHECK(resolved_method != nullptr); 3771 return resolved_method; 3772} 3773 3774 3775mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3776 Handle<mirror::Class> klass, 3777 mirror::Class* proxy_class) { 3778 // Create constructor for Proxy that must initialize h 3779 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3780 proxy_class->GetDirectMethods(); 3781 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3782 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3783 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 3784 // constructor method. 3785 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 3786 proxy_constructor); 3787 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3788 // code_ too) 3789 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3790 if (constructor == nullptr) { 3791 CHECK(self->IsExceptionPending()); // OOME. 3792 return nullptr; 3793 } 3794 // Make this constructor public and fix the class to be our Proxy version 3795 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3796 constructor->SetDeclaringClass(klass.Get()); 3797 return constructor; 3798} 3799 3800static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3801 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3802 CHECK(constructor->IsConstructor()); 3803 CHECK_STREQ(constructor->GetName(), "<init>"); 3804 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3805 "(Ljava/lang/reflect/InvocationHandler;)V"); 3806 DCHECK(constructor->IsPublic()); 3807} 3808 3809mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3810 Handle<mirror::Class> klass, 3811 Handle<mirror::ArtMethod> prototype) { 3812 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3813 // prototype method 3814 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3815 prototype.Get()); 3816 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3817 // as necessary 3818 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3819 if (UNLIKELY(method == NULL)) { 3820 CHECK(self->IsExceptionPending()); // OOME. 3821 return NULL; 3822 } 3823 3824 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3825 // the intersection of throw exceptions as defined in Proxy 3826 method->SetDeclaringClass(klass.Get()); 3827 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3828 3829 // At runtime the method looks like a reference and argument saving method, clone the code 3830 // related parameters from this method. 3831 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3832 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3833 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3834 3835 return method; 3836} 3837 3838static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3839 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3840 // Basic sanity 3841 CHECK(!prototype->IsFinal()); 3842 CHECK(method->IsFinal()); 3843 CHECK(!method->IsAbstract()); 3844 3845 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3846 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3847 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3848 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 3849 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 3850 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3851 3852 MethodHelper mh(method); 3853 MethodHelper mh2(prototype); 3854 CHECK_STREQ(method->GetName(), prototype->GetName()); 3855 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3856 // More complex sanity - via dex cache 3857 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3858} 3859 3860static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3861 bool can_init_parents) 3862 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3863 if (can_init_statics && can_init_parents) { 3864 return true; 3865 } 3866 if (!can_init_statics) { 3867 // Check if there's a class initializer. 3868 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3869 if (clinit != NULL) { 3870 return false; 3871 } 3872 // Check if there are encoded static values needing initialization. 3873 if (klass->NumStaticFields() != 0) { 3874 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3875 DCHECK(dex_class_def != NULL); 3876 if (dex_class_def->static_values_off_ != 0) { 3877 return false; 3878 } 3879 } 3880 } 3881 if (!klass->IsInterface() && klass->HasSuperClass()) { 3882 mirror::Class* super_class = klass->GetSuperClass(); 3883 if (!can_init_parents && !super_class->IsInitialized()) { 3884 return false; 3885 } else { 3886 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3887 return false; 3888 } 3889 } 3890 } 3891 return true; 3892} 3893 3894bool ClassLinker::IsInitialized() const { 3895 return init_done_; 3896} 3897 3898bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3899 bool can_init_parents) { 3900 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3901 3902 // Are we already initialized and therefore done? 3903 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3904 // an initialized class will never change its state. 3905 if (klass->IsInitialized()) { 3906 return true; 3907 } 3908 3909 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3910 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3911 return false; 3912 } 3913 3914 Thread* self = Thread::Current(); 3915 uint64_t t0; 3916 { 3917 ObjectLock<mirror::Class> lock(self, klass); 3918 3919 // Re-check under the lock in case another thread initialized ahead of us. 3920 if (klass->IsInitialized()) { 3921 return true; 3922 } 3923 3924 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3925 if (klass->IsErroneous()) { 3926 ThrowEarlierClassFailure(klass.Get()); 3927 return false; 3928 } 3929 3930 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3931 3932 if (!klass->IsVerified()) { 3933 VerifyClass(klass); 3934 if (!klass->IsVerified()) { 3935 // We failed to verify, expect either the klass to be erroneous or verification failed at 3936 // compile time. 3937 if (klass->IsErroneous()) { 3938 CHECK(self->IsExceptionPending()); 3939 } else { 3940 CHECK(Runtime::Current()->IsCompiler()); 3941 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3942 } 3943 return false; 3944 } else { 3945 self->AssertNoPendingException(); 3946 } 3947 } 3948 3949 // If the class is kStatusInitializing, either this thread is 3950 // initializing higher up the stack or another thread has beat us 3951 // to initializing and we need to wait. Either way, this 3952 // invocation of InitializeClass will not be responsible for 3953 // running <clinit> and will return. 3954 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3955 // Could have got an exception during verification. 3956 if (self->IsExceptionPending()) { 3957 return false; 3958 } 3959 // We caught somebody else in the act; was it us? 3960 if (klass->GetClinitThreadId() == self->GetTid()) { 3961 // Yes. That's fine. Return so we can continue initializing. 3962 return true; 3963 } 3964 // No. That's fine. Wait for another thread to finish initializing. 3965 return WaitForInitializeClass(klass, self, lock); 3966 } 3967 3968 if (!ValidateSuperClassDescriptors(klass)) { 3969 klass->SetStatus(mirror::Class::kStatusError, self); 3970 return false; 3971 } 3972 3973 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3974 3975 // From here out other threads may observe that we're initializing and so changes of state 3976 // require the a notification. 3977 klass->SetClinitThreadId(self->GetTid()); 3978 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3979 3980 t0 = NanoTime(); 3981 } 3982 3983 // Initialize super classes, must be done while initializing for the JLS. 3984 if (!klass->IsInterface() && klass->HasSuperClass()) { 3985 mirror::Class* super_class = klass->GetSuperClass(); 3986 if (!super_class->IsInitialized()) { 3987 CHECK(!super_class->IsInterface()); 3988 CHECK(can_init_parents); 3989 StackHandleScope<1> hs(self); 3990 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3991 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3992 if (!super_initialized) { 3993 // The super class was verified ahead of entering initializing, we should only be here if 3994 // the super class became erroneous due to initialization. 3995 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3996 << "Super class initialization failed for " 3997 << PrettyDescriptor(handle_scope_super.Get()) 3998 << " that has unexpected status " << handle_scope_super->GetStatus() 3999 << "\nPending exception:\n" 4000 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 4001 ObjectLock<mirror::Class> lock(self, klass); 4002 // Initialization failed because the super-class is erroneous. 4003 klass->SetStatus(mirror::Class::kStatusError, self); 4004 return false; 4005 } 4006 } 4007 } 4008 4009 if (klass->NumStaticFields() > 0) { 4010 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4011 CHECK(dex_class_def != NULL); 4012 const DexFile& dex_file = klass->GetDexFile(); 4013 StackHandleScope<2> hs(self); 4014 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 4015 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 4016 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 4017 this, *dex_class_def); 4018 if (it.HasNext()) { 4019 CHECK(can_init_statics); 4020 // We reordered the fields, so we need to be able to map the 4021 // field indexes to the right fields. 4022 SafeMap<uint32_t, mirror::ArtField*> field_map; 4023 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 4024 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 4025 if (Runtime::Current()->IsActiveTransaction()) { 4026 it.ReadValueToField<true>(field_map.Get(i)); 4027 } else { 4028 it.ReadValueToField<false>(field_map.Get(i)); 4029 } 4030 } 4031 } 4032 } 4033 4034 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4035 if (clinit != NULL) { 4036 CHECK(can_init_statics); 4037 JValue result; 4038 clinit->Invoke(self, NULL, 0, &result, "V"); 4039 } 4040 4041 uint64_t t1 = NanoTime(); 4042 4043 bool success = true; 4044 { 4045 ObjectLock<mirror::Class> lock(self, klass); 4046 4047 if (self->IsExceptionPending()) { 4048 WrapExceptionInInitializer(); 4049 klass->SetStatus(mirror::Class::kStatusError, self); 4050 success = false; 4051 } else { 4052 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 4053 RuntimeStats* thread_stats = self->GetStats(); 4054 ++global_stats->class_init_count; 4055 ++thread_stats->class_init_count; 4056 global_stats->class_init_time_ns += (t1 - t0); 4057 thread_stats->class_init_time_ns += (t1 - t0); 4058 // Set the class as initialized except if failed to initialize static fields. 4059 klass->SetStatus(mirror::Class::kStatusInitialized, self); 4060 if (VLOG_IS_ON(class_linker)) { 4061 std::string temp; 4062 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 4063 klass->GetLocation(); 4064 } 4065 // Opportunistically set static method trampolines to their destination. 4066 FixupStaticTrampolines(klass.Get()); 4067 } 4068 } 4069 return success; 4070} 4071 4072bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 4073 ObjectLock<mirror::Class>& lock) 4074 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4075 while (true) { 4076 self->AssertNoPendingException(); 4077 CHECK(!klass->IsInitialized()); 4078 lock.WaitIgnoringInterrupts(); 4079 4080 // When we wake up, repeat the test for init-in-progress. If 4081 // there's an exception pending (only possible if 4082 // "interruptShouldThrow" was set), bail out. 4083 if (self->IsExceptionPending()) { 4084 WrapExceptionInInitializer(); 4085 klass->SetStatus(mirror::Class::kStatusError, self); 4086 return false; 4087 } 4088 // Spurious wakeup? Go back to waiting. 4089 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4090 continue; 4091 } 4092 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 4093 // Compile time initialization failed. 4094 return false; 4095 } 4096 if (klass->IsErroneous()) { 4097 // The caller wants an exception, but it was thrown in a 4098 // different thread. Synthesize one here. 4099 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 4100 PrettyDescriptor(klass.Get()).c_str()); 4101 return false; 4102 } 4103 if (klass->IsInitialized()) { 4104 return true; 4105 } 4106 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4107 << klass->GetStatus(); 4108 } 4109 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 4110} 4111 4112bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 4113 if (klass->IsInterface()) { 4114 return true; 4115 } 4116 // Begin with the methods local to the superclass. 4117 StackHandleScope<2> hs(Thread::Current()); 4118 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4119 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4120 if (klass->HasSuperClass() && 4121 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4122 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4123 mh.ChangeMethod(klass->GetVTableEntry(i)); 4124 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 4125 if (mh.GetMethod() != super_mh.GetMethod() && 4126 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4127 ThrowLinkageError(klass.Get(), 4128 "Class %s method %s resolves differently in superclass %s", 4129 PrettyDescriptor(klass.Get()).c_str(), 4130 PrettyMethod(mh.GetMethod()).c_str(), 4131 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4132 return false; 4133 } 4134 } 4135 } 4136 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4137 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4138 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4139 for (uint32_t j = 0; j < num_methods; ++j) { 4140 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4141 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4142 if (mh.GetMethod() != super_mh.GetMethod() && 4143 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4144 ThrowLinkageError(klass.Get(), 4145 "Class %s method %s resolves differently in interface %s", 4146 PrettyDescriptor(klass.Get()).c_str(), 4147 PrettyMethod(mh.GetMethod()).c_str(), 4148 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4149 return false; 4150 } 4151 } 4152 } 4153 } 4154 return true; 4155} 4156 4157bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 4158 bool can_init_parents) { 4159 DCHECK(c.Get() != nullptr); 4160 if (c->IsInitialized()) { 4161 return true; 4162 } 4163 const bool success = InitializeClass(c, can_init_fields, can_init_parents); 4164 Thread* self = Thread::Current(); 4165 if (!success) { 4166 if (can_init_fields && can_init_parents) { 4167 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4168 } 4169 } else { 4170 self->AssertNoPendingException(); 4171 } 4172 return success; 4173} 4174 4175void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 4176 mirror::Class* c, 4177 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 4178 const byte* class_data = dex_file.GetClassData(dex_class_def); 4179 ClassDataItemIterator it(dex_file, class_data); 4180 StackHandleScope<2> hs(Thread::Current()); 4181 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 4182 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 4183 CHECK(!kMovingFields); 4184 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 4185 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 4186 } 4187} 4188 4189void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4190 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4191 if (fields != nullptr) { 4192 for (int index = 0; index < fields->GetLength(); index ++) { 4193 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4194 fields->Get(index)->SetDeclaringClass(new_class); 4195 } 4196 } 4197 } 4198 4199 fields = new_class->GetSFields(); 4200 if (fields != nullptr) { 4201 for (int index = 0; index < fields->GetLength(); index ++) { 4202 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4203 fields->Get(index)->SetDeclaringClass(new_class); 4204 } 4205 } 4206 } 4207 4208 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4209 if (methods != nullptr) { 4210 for (int index = 0; index < methods->GetLength(); index ++) { 4211 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4212 methods->Get(index)->SetDeclaringClass(new_class); 4213 } 4214 } 4215 } 4216 4217 methods = new_class->GetVirtualMethods(); 4218 if (methods != nullptr) { 4219 for (int index = 0; index < methods->GetLength(); index ++) { 4220 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4221 methods->Get(index)->SetDeclaringClass(new_class); 4222 } 4223 } 4224 } 4225} 4226 4227bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4228 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4229 mirror::Class** new_class) { 4230 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4231 4232 if (!LinkSuperClass(klass)) { 4233 return false; 4234 } 4235 if (!LinkMethods(self, klass, interfaces)) { 4236 return false; 4237 } 4238 if (!LinkInstanceFields(klass)) { 4239 return false; 4240 } 4241 size_t class_size; 4242 if (!LinkStaticFields(klass, &class_size)) { 4243 return false; 4244 } 4245 CreateReferenceInstanceOffsets(klass); 4246 CreateReferenceStaticOffsets(klass); 4247 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4248 4249 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4250 // We don't need to retire this class as it has no embedded tables or it was created the 4251 // correct size during class linker initialization. 4252 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4253 4254 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4255 klass->PopulateEmbeddedImtAndVTable(); 4256 } 4257 4258 // This will notify waiters on klass that saw the not yet resolved 4259 // class in the class_table_ during EnsureResolved. 4260 klass->SetStatus(mirror::Class::kStatusResolved, self); 4261 *new_class = klass.Get(); 4262 } else { 4263 CHECK(!klass->IsResolved()); 4264 // Retire the temporary class and create the correctly sized resolved class. 4265 *new_class = klass->CopyOf(self, class_size); 4266 if (UNLIKELY(*new_class == NULL)) { 4267 CHECK(self->IsExceptionPending()); // Expect an OOME. 4268 klass->SetStatus(mirror::Class::kStatusError, self); 4269 return false; 4270 } 4271 4272 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4273 StackHandleScope<1> hs(self); 4274 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4275 ObjectLock<mirror::Class> lock(self, new_class_h); 4276 4277 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4278 4279 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4280 CHECK(existing == NULL || existing == klass.Get()); 4281 4282 // This will notify waiters on temp class that saw the not yet resolved class in the 4283 // class_table_ during EnsureResolved. 4284 klass->SetStatus(mirror::Class::kStatusRetired, self); 4285 4286 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4287 // This will notify waiters on new_class that saw the not yet resolved 4288 // class in the class_table_ during EnsureResolved. 4289 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4290 } 4291 return true; 4292} 4293 4294bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4295 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4296 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4297 uint16_t super_class_idx = class_def.superclass_idx_; 4298 if (super_class_idx != DexFile::kDexNoIndex16) { 4299 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4300 if (super_class == NULL) { 4301 DCHECK(Thread::Current()->IsExceptionPending()); 4302 return false; 4303 } 4304 // Verify 4305 if (!klass->CanAccess(super_class)) { 4306 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4307 PrettyDescriptor(super_class).c_str(), 4308 PrettyDescriptor(klass.Get()).c_str()); 4309 return false; 4310 } 4311 CHECK(super_class->IsResolved()); 4312 klass->SetSuperClass(super_class); 4313 } 4314 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4315 if (interfaces != NULL) { 4316 for (size_t i = 0; i < interfaces->Size(); i++) { 4317 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4318 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4319 if (interface == NULL) { 4320 DCHECK(Thread::Current()->IsExceptionPending()); 4321 return false; 4322 } 4323 // Verify 4324 if (!klass->CanAccess(interface)) { 4325 // TODO: the RI seemed to ignore this in my testing. 4326 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4327 PrettyDescriptor(interface).c_str(), 4328 PrettyDescriptor(klass.Get()).c_str()); 4329 return false; 4330 } 4331 } 4332 } 4333 // Mark the class as loaded. 4334 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 4335 return true; 4336} 4337 4338bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4339 CHECK(!klass->IsPrimitive()); 4340 mirror::Class* super = klass->GetSuperClass(); 4341 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4342 if (super != NULL) { 4343 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4344 return false; 4345 } 4346 return true; 4347 } 4348 if (super == NULL) { 4349 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4350 PrettyDescriptor(klass.Get()).c_str()); 4351 return false; 4352 } 4353 // Verify 4354 if (super->IsFinal() || super->IsInterface()) { 4355 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4356 PrettyDescriptor(super).c_str(), 4357 PrettyDescriptor(klass.Get()).c_str(), 4358 super->IsFinal() ? "declared final" : "an interface"); 4359 return false; 4360 } 4361 if (!klass->CanAccess(super)) { 4362 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4363 PrettyDescriptor(super).c_str(), 4364 PrettyDescriptor(klass.Get()).c_str()); 4365 return false; 4366 } 4367 4368 // Inherit kAccClassIsFinalizable from the superclass in case this 4369 // class doesn't override finalize. 4370 if (super->IsFinalizable()) { 4371 klass->SetFinalizable(); 4372 } 4373 4374 // Inherit reference flags (if any) from the superclass. 4375 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4376 if (reference_flags != 0) { 4377 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4378 } 4379 // Disallow custom direct subclasses of java.lang.ref.Reference. 4380 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4381 ThrowLinkageError(klass.Get(), 4382 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4383 PrettyDescriptor(klass.Get()).c_str()); 4384 return false; 4385 } 4386 4387 if (kIsDebugBuild) { 4388 // Ensure super classes are fully resolved prior to resolving fields.. 4389 while (super != NULL) { 4390 CHECK(super->IsResolved()); 4391 super = super->GetSuperClass(); 4392 } 4393 } 4394 return true; 4395} 4396 4397// Populate the class vtable and itable. Compute return type indices. 4398bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4399 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4400 if (klass->IsInterface()) { 4401 // No vtable. 4402 size_t count = klass->NumVirtualMethods(); 4403 if (!IsUint(16, count)) { 4404 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4405 return false; 4406 } 4407 for (size_t i = 0; i < count; ++i) { 4408 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4409 } 4410 // Link interface method tables 4411 return LinkInterfaceMethods(klass, interfaces); 4412 } else { 4413 // Link virtual and interface method tables 4414 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4415 } 4416 return true; 4417} 4418 4419bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4420 if (klass->HasSuperClass()) { 4421 uint32_t max_count = klass->NumVirtualMethods() + 4422 klass->GetSuperClass()->GetVTableLength(); 4423 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4424 CHECK_LE(actual_count, max_count); 4425 StackHandleScope<4> hs(self); 4426 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4427 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4428 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4429 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4430 if (UNLIKELY(vtable.Get() == nullptr)) { 4431 CHECK(self->IsExceptionPending()); // OOME. 4432 return false; 4433 } 4434 int len = super_class->GetVTableLength(); 4435 for (int i = 0; i < len; i++) { 4436 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4437 } 4438 } else { 4439 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4440 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4441 if (UNLIKELY(vtable.Get() == nullptr)) { 4442 CHECK(self->IsExceptionPending()); // OOME. 4443 return false; 4444 } 4445 } 4446 4447 // See if any of our virtual methods override the superclass. 4448 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4449 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4450 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4451 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4452 local_mh.ChangeMethod(local_method); 4453 size_t j = 0; 4454 for (; j < actual_count; ++j) { 4455 mirror::ArtMethod* super_method = vtable->Get(j); 4456 super_mh.ChangeMethod(super_method); 4457 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4458 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4459 super_method->GetAccessFlags())) { 4460 if (super_method->IsFinal()) { 4461 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4462 PrettyMethod(local_method).c_str(), 4463 super_method->GetDeclaringClassDescriptor()); 4464 return false; 4465 } 4466 vtable->Set<false>(j, local_method); 4467 local_method->SetMethodIndex(j); 4468 break; 4469 } else { 4470 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4471 << " would have incorrectly overridden the package-private method in " 4472 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4473 } 4474 } 4475 } 4476 if (j == actual_count) { 4477 // Not overriding, append. 4478 vtable->Set<false>(actual_count, local_method); 4479 local_method->SetMethodIndex(actual_count); 4480 actual_count += 1; 4481 } 4482 } 4483 if (!IsUint(16, actual_count)) { 4484 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4485 return false; 4486 } 4487 // Shrink vtable if possible 4488 CHECK_LE(actual_count, max_count); 4489 if (actual_count < max_count) { 4490 vtable.Assign(vtable->CopyOf(self, actual_count)); 4491 if (UNLIKELY(vtable.Get() == NULL)) { 4492 CHECK(self->IsExceptionPending()); // OOME. 4493 return false; 4494 } 4495 } 4496 klass->SetVTable(vtable.Get()); 4497 } else { 4498 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4499 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4500 if (!IsUint(16, num_virtual_methods)) { 4501 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4502 return false; 4503 } 4504 StackHandleScope<1> hs(self); 4505 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4506 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4507 if (UNLIKELY(vtable.Get() == NULL)) { 4508 CHECK(self->IsExceptionPending()); // OOME. 4509 return false; 4510 } 4511 for (size_t i = 0; i < num_virtual_methods; ++i) { 4512 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4513 vtable->Set<false>(i, virtual_method); 4514 virtual_method->SetMethodIndex(i & 0xFFFF); 4515 } 4516 klass->SetVTable(vtable.Get()); 4517 } 4518 return true; 4519} 4520 4521bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 4522 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4523 Thread* const self = Thread::Current(); 4524 Runtime* const runtime = Runtime::Current(); 4525 // Set the imt table to be all conflicts by default. 4526 klass->SetImTable(runtime->GetDefaultImt()); 4527 size_t super_ifcount; 4528 if (klass->HasSuperClass()) { 4529 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4530 } else { 4531 super_ifcount = 0; 4532 } 4533 uint32_t num_interfaces = 4534 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4535 size_t ifcount = super_ifcount + num_interfaces; 4536 for (size_t i = 0; i < num_interfaces; i++) { 4537 mirror::Class* interface = 4538 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4539 interfaces->Get(i); 4540 ifcount += interface->GetIfTableCount(); 4541 } 4542 if (ifcount == 0) { 4543 // Class implements no interfaces. 4544 DCHECK_EQ(klass->GetIfTableCount(), 0); 4545 DCHECK(klass->GetIfTable() == NULL); 4546 return true; 4547 } 4548 if (ifcount == super_ifcount) { 4549 // Class implements same interfaces as parent, are any of these not marker interfaces? 4550 bool has_non_marker_interface = false; 4551 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4552 for (size_t i = 0; i < ifcount; ++i) { 4553 if (super_iftable->GetMethodArrayCount(i) > 0) { 4554 has_non_marker_interface = true; 4555 break; 4556 } 4557 } 4558 if (!has_non_marker_interface) { 4559 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4560 klass->SetIfTable(super_iftable); 4561 return true; 4562 } 4563 } 4564 StackHandleScope<4> hs(self); 4565 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4566 if (UNLIKELY(iftable.Get() == NULL)) { 4567 CHECK(self->IsExceptionPending()); // OOME. 4568 return false; 4569 } 4570 if (super_ifcount != 0) { 4571 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4572 for (size_t i = 0; i < super_ifcount; i++) { 4573 mirror::Class* super_interface = super_iftable->GetInterface(i); 4574 iftable->SetInterface(i, super_interface); 4575 } 4576 } 4577 // Flatten the interface inheritance hierarchy. 4578 size_t idx = super_ifcount; 4579 for (size_t i = 0; i < num_interfaces; i++) { 4580 mirror::Class* interface = 4581 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4582 interfaces->Get(i); 4583 DCHECK(interface != NULL); 4584 if (!interface->IsInterface()) { 4585 std::string temp; 4586 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4587 PrettyDescriptor(klass.Get()).c_str(), 4588 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4589 return false; 4590 } 4591 // Check if interface is already in iftable 4592 bool duplicate = false; 4593 for (size_t j = 0; j < idx; j++) { 4594 mirror::Class* existing_interface = iftable->GetInterface(j); 4595 if (existing_interface == interface) { 4596 duplicate = true; 4597 break; 4598 } 4599 } 4600 if (!duplicate) { 4601 // Add this non-duplicate interface. 4602 iftable->SetInterface(idx++, interface); 4603 // Add this interface's non-duplicate super-interfaces. 4604 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4605 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4606 bool super_duplicate = false; 4607 for (size_t k = 0; k < idx; k++) { 4608 mirror::Class* existing_interface = iftable->GetInterface(k); 4609 if (existing_interface == super_interface) { 4610 super_duplicate = true; 4611 break; 4612 } 4613 } 4614 if (!super_duplicate) { 4615 iftable->SetInterface(idx++, super_interface); 4616 } 4617 } 4618 } 4619 } 4620 // Shrink iftable in case duplicates were found 4621 if (idx < ifcount) { 4622 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4623 if (UNLIKELY(iftable.Get() == NULL)) { 4624 CHECK(self->IsExceptionPending()); // OOME. 4625 return false; 4626 } 4627 ifcount = idx; 4628 } else { 4629 CHECK_EQ(idx, ifcount); 4630 } 4631 klass->SetIfTable(iftable.Get()); 4632 4633 // If we're an interface, we don't need the vtable pointers, so we're done. 4634 if (klass->IsInterface()) { 4635 return true; 4636 } 4637 // Allocate imtable 4638 bool imtable_changed = false; 4639 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4640 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4641 if (UNLIKELY(imtable.Get() == NULL)) { 4642 CHECK(self->IsExceptionPending()); // OOME. 4643 return false; 4644 } 4645 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4646 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4647 std::vector<mirror::ArtMethod*> miranda_list; 4648 for (size_t i = 0; i < ifcount; ++i) { 4649 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4650 if (num_methods > 0) { 4651 StackHandleScope<2> hs(self); 4652 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4653 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4654 if (UNLIKELY(method_array.Get() == nullptr)) { 4655 CHECK(self->IsExceptionPending()); // OOME. 4656 return false; 4657 } 4658 iftable->SetMethodArray(i, method_array.Get()); 4659 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4660 hs.NewHandle(klass->GetVTableDuringLinking())); 4661 for (size_t j = 0; j < num_methods; ++j) { 4662 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 4663 interface_mh.ChangeMethod(interface_method); 4664 int32_t k; 4665 // For each method listed in the interface's method list, find the 4666 // matching method in our class's method list. We want to favor the 4667 // subclass over the superclass, which just requires walking 4668 // back from the end of the vtable. (This only matters if the 4669 // superclass defines a private method and this class redefines 4670 // it -- otherwise it would use the same vtable slot. In .dex files 4671 // those don't end up in the virtual method table, so it shouldn't 4672 // matter which direction we go. We walk it backward anyway.) 4673 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4674 mirror::ArtMethod* vtable_method = vtable->Get(k); 4675 vtable_mh.ChangeMethod(vtable_method); 4676 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4677 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 4678 ThrowIllegalAccessError( 4679 klass.Get(), 4680 "Method '%s' implementing interface method '%s' is not public", 4681 PrettyMethod(vtable_method).c_str(), 4682 PrettyMethod(interface_method).c_str()); 4683 return false; 4684 } 4685 method_array->Set<false>(j, vtable_method); 4686 // Place method in imt if entry is empty, place conflict otherwise. 4687 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4688 if (imtable->Get(imt_index) == NULL) { 4689 imtable->Set<false>(imt_index, vtable_method); 4690 imtable_changed = true; 4691 } else { 4692 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4693 } 4694 break; 4695 } 4696 } 4697 if (k < 0) { 4698 StackHandleScope<1> hs(self); 4699 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4700 for (mirror::ArtMethod* mir_method : miranda_list) { 4701 vtable_mh.ChangeMethod(mir_method); 4702 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4703 miranda_method.Assign(mir_method); 4704 break; 4705 } 4706 } 4707 if (miranda_method.Get() == NULL) { 4708 // Point the interface table at a phantom slot. 4709 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 4710 if (UNLIKELY(miranda_method.Get() == NULL)) { 4711 CHECK(self->IsExceptionPending()); // OOME. 4712 return false; 4713 } 4714 // TODO: If a methods move then the miranda_list may hold stale references. 4715 miranda_list.push_back(miranda_method.Get()); 4716 } 4717 method_array->Set<false>(j, miranda_method.Get()); 4718 } 4719 } 4720 } 4721 } 4722 if (imtable_changed) { 4723 // Fill in empty entries in interface method table with conflict. 4724 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4725 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4726 if (imtable->Get(i) == NULL) { 4727 imtable->Set<false>(i, imt_conflict_method); 4728 } 4729 } 4730 klass->SetImTable(imtable.Get()); 4731 } 4732 if (!miranda_list.empty()) { 4733 int old_method_count = klass->NumVirtualMethods(); 4734 int new_method_count = old_method_count + miranda_list.size(); 4735 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4736 if (old_method_count == 0) { 4737 virtuals = AllocArtMethodArray(self, new_method_count); 4738 } else { 4739 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4740 } 4741 if (UNLIKELY(virtuals == NULL)) { 4742 CHECK(self->IsExceptionPending()); // OOME. 4743 return false; 4744 } 4745 klass->SetVirtualMethods(virtuals); 4746 4747 StackHandleScope<1> hs(self); 4748 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4749 hs.NewHandle(klass->GetVTableDuringLinking())); 4750 CHECK(vtable.Get() != NULL); 4751 int old_vtable_count = vtable->GetLength(); 4752 int new_vtable_count = old_vtable_count + miranda_list.size(); 4753 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4754 if (UNLIKELY(vtable.Get() == NULL)) { 4755 CHECK(self->IsExceptionPending()); // OOME. 4756 return false; 4757 } 4758 for (size_t i = 0; i < miranda_list.size(); ++i) { 4759 mirror::ArtMethod* method = miranda_list[i]; 4760 // Leave the declaring class alone as type indices are relative to it 4761 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4762 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4763 klass->SetVirtualMethod(old_method_count + i, method); 4764 vtable->Set<false>(old_vtable_count + i, method); 4765 } 4766 // TODO: do not assign to the vtable field until it is fully constructed. 4767 klass->SetVTable(vtable.Get()); 4768 } 4769 4770 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4771 for (int i = 0; i < vtable->GetLength(); ++i) { 4772 CHECK(vtable->Get(i) != NULL); 4773 } 4774 4775// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4776 4777 return true; 4778} 4779 4780bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4781 CHECK(klass.Get() != NULL); 4782 return LinkFields(klass, false, nullptr); 4783} 4784 4785bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass, size_t* class_size) { 4786 CHECK(klass.Get() != NULL); 4787 return LinkFields(klass, true, class_size); 4788} 4789 4790struct LinkFieldsComparator { 4791 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4792 } 4793 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4794 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4795 NO_THREAD_SAFETY_ANALYSIS { 4796 // First come reference fields, then 64-bit, and finally 32-bit 4797 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4798 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4799 if (type1 != type2) { 4800 bool is_primitive1 = type1 != Primitive::kPrimNot; 4801 bool is_primitive2 = type2 != Primitive::kPrimNot; 4802 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4803 type1 == Primitive::kPrimDouble); 4804 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4805 type2 == Primitive::kPrimDouble); 4806 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4807 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4808 if (order1 != order2) { 4809 return order1 < order2; 4810 } 4811 } 4812 // same basic group? then sort by string. 4813 return strcmp(field1->GetName(), field2->GetName()) < 0; 4814 } 4815}; 4816 4817bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static, size_t* class_size) { 4818 size_t num_fields = 4819 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4820 4821 mirror::ObjectArray<mirror::ArtField>* fields = 4822 is_static ? klass->GetSFields() : klass->GetIFields(); 4823 4824 // Initialize field_offset 4825 MemberOffset field_offset(0); 4826 if (is_static) { 4827 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 4828 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4829 // Static fields come after the embedded tables. 4830 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 4831 0, 0, 0); 4832 } 4833 field_offset = MemberOffset(base); 4834 } else { 4835 mirror::Class* super_class = klass->GetSuperClass(); 4836 if (super_class != NULL) { 4837 CHECK(super_class->IsResolved()) 4838 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4839 field_offset = MemberOffset(super_class->GetObjectSize()); 4840 } 4841 } 4842 4843 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4844 4845 // we want a relatively stable order so that adding new fields 4846 // minimizes disruption of C++ version such as Class and Method. 4847 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4848 for (size_t i = 0; i < num_fields; i++) { 4849 mirror::ArtField* f = fields->Get(i); 4850 CHECK(f != NULL) << PrettyClass(klass.Get()); 4851 grouped_and_sorted_fields.push_back(f); 4852 } 4853 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4854 LinkFieldsComparator()); 4855 4856 // References should be at the front. 4857 size_t current_field = 0; 4858 size_t num_reference_fields = 0; 4859 for (; current_field < num_fields; current_field++) { 4860 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4861 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4862 bool isPrimitive = type != Primitive::kPrimNot; 4863 if (isPrimitive) { 4864 break; // past last reference, move on to the next phase 4865 } 4866 grouped_and_sorted_fields.pop_front(); 4867 num_reference_fields++; 4868 fields->Set<false>(current_field, field); 4869 field->SetOffset(field_offset); 4870 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4871 } 4872 4873 // Now we want to pack all of the double-wide fields together. If 4874 // we're not aligned, though, we want to shuffle one 32-bit field 4875 // into place. If we can't find one, we'll have to pad it. 4876 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4877 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4878 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4879 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4880 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4881 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4882 continue; 4883 } 4884 fields->Set<false>(current_field++, field); 4885 field->SetOffset(field_offset); 4886 // drop the consumed field 4887 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4888 break; 4889 } 4890 // whether we found a 32-bit field for padding or not, we advance 4891 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4892 } 4893 4894 // Alignment is good, shuffle any double-wide fields forward, and 4895 // finish assigning field offsets to all fields. 4896 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 4897 << PrettyClass(klass.Get()); 4898 while (!grouped_and_sorted_fields.empty()) { 4899 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4900 grouped_and_sorted_fields.pop_front(); 4901 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4902 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4903 fields->Set<false>(current_field, field); 4904 field->SetOffset(field_offset); 4905 field_offset = MemberOffset(field_offset.Uint32Value() + 4906 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4907 ? sizeof(uint64_t) 4908 : sizeof(uint32_t))); 4909 current_field++; 4910 } 4911 4912 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4913 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4914 // We know there are no non-reference fields in the Reference classes, and we know 4915 // that 'referent' is alphabetically last, so this is easy... 4916 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4917 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4918 --num_reference_fields; 4919 } 4920 4921 if (kIsDebugBuild) { 4922 // Make sure that all reference fields appear before 4923 // non-reference fields, and all double-wide fields are aligned. 4924 bool seen_non_ref = false; 4925 for (size_t i = 0; i < num_fields; i++) { 4926 mirror::ArtField* field = fields->Get(i); 4927 if (false) { // enable to debug field layout 4928 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4929 << " class=" << PrettyClass(klass.Get()) 4930 << " field=" << PrettyField(field) 4931 << " offset=" 4932 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4933 } 4934 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4935 bool is_primitive = type != Primitive::kPrimNot; 4936 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4937 strcmp("referent", field->GetName()) == 0) { 4938 is_primitive = true; // We lied above, so we have to expect a lie here. 4939 } 4940 if (is_primitive) { 4941 if (!seen_non_ref) { 4942 seen_non_ref = true; 4943 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4944 } 4945 } else { 4946 DCHECK(!seen_non_ref) << PrettyField(field); 4947 } 4948 } 4949 if (!seen_non_ref) { 4950 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4951 } 4952 } 4953 4954 size_t size = field_offset.Uint32Value(); 4955 // Update klass 4956 if (is_static) { 4957 klass->SetNumReferenceStaticFields(num_reference_fields); 4958 *class_size = size; 4959 } else { 4960 klass->SetNumReferenceInstanceFields(num_reference_fields); 4961 if (!klass->IsVariableSize()) { 4962 std::string temp; 4963 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 4964 size_t previous_size = klass->GetObjectSize(); 4965 if (previous_size != 0) { 4966 // Make sure that we didn't originally have an incorrect size. 4967 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 4968 } 4969 klass->SetObjectSize(size); 4970 } 4971 } 4972 return true; 4973} 4974 4975// Set the bitmap of reference offsets, refOffsets, from the ifields 4976// list. 4977void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4978 uint32_t reference_offsets = 0; 4979 mirror::Class* super_class = klass->GetSuperClass(); 4980 if (super_class != NULL) { 4981 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4982 // If our superclass overflowed, we don't stand a chance. 4983 if (reference_offsets == CLASS_WALK_SUPER) { 4984 klass->SetReferenceInstanceOffsets(reference_offsets); 4985 return; 4986 } 4987 } 4988 CreateReferenceOffsets(klass, false, reference_offsets); 4989} 4990 4991void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4992 CreateReferenceOffsets(klass, true, 0); 4993} 4994 4995void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4996 uint32_t reference_offsets) { 4997 size_t num_reference_fields = 4998 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4999 : klass->NumReferenceInstanceFieldsDuringLinking(); 5000 mirror::ObjectArray<mirror::ArtField>* fields = 5001 is_static ? klass->GetSFields() : klass->GetIFields(); 5002 // All of the fields that contain object references are guaranteed 5003 // to be at the beginning of the fields list. 5004 for (size_t i = 0; i < num_reference_fields; ++i) { 5005 // Note that byte_offset is the offset from the beginning of 5006 // object, not the offset into instance data 5007 mirror::ArtField* field = fields->Get(i); 5008 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 5009 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 5010 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 5011 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 5012 CHECK_NE(new_bit, 0U); 5013 reference_offsets |= new_bit; 5014 } else { 5015 reference_offsets = CLASS_WALK_SUPER; 5016 break; 5017 } 5018 } 5019 // Update fields in klass 5020 if (is_static) { 5021 klass->SetReferenceStaticOffsets(reference_offsets); 5022 } else { 5023 klass->SetReferenceInstanceOffsets(reference_offsets); 5024 } 5025} 5026 5027mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 5028 Handle<mirror::DexCache> dex_cache) { 5029 DCHECK(dex_cache.Get() != nullptr); 5030 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 5031 if (resolved != NULL) { 5032 return resolved; 5033 } 5034 uint32_t utf16_length; 5035 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 5036 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 5037 dex_cache->SetResolvedString(string_idx, string); 5038 return string; 5039} 5040 5041mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5042 mirror::Class* referrer) { 5043 StackHandleScope<2> hs(Thread::Current()); 5044 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 5045 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 5046 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 5047} 5048 5049mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5050 Handle<mirror::DexCache> dex_cache, 5051 Handle<mirror::ClassLoader> class_loader) { 5052 DCHECK(dex_cache.Get() != NULL); 5053 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 5054 if (resolved == NULL) { 5055 Thread* self = Thread::Current(); 5056 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 5057 resolved = FindClass(self, descriptor, class_loader); 5058 if (resolved != NULL) { 5059 // TODO: we used to throw here if resolved's class loader was not the 5060 // boot class loader. This was to permit different classes with the 5061 // same name to be loaded simultaneously by different loaders 5062 dex_cache->SetResolvedType(type_idx, resolved); 5063 } else { 5064 CHECK(self->IsExceptionPending()) 5065 << "Expected pending exception for failed resolution of: " << descriptor; 5066 // Convert a ClassNotFoundException to a NoClassDefFoundError. 5067 StackHandleScope<1> hs(self); 5068 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 5069 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 5070 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 5071 self->ClearException(); 5072 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 5073 self->GetException(NULL)->SetCause(cause.Get()); 5074 } 5075 } 5076 } 5077 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 5078 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 5079 return resolved; 5080} 5081 5082mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 5083 Handle<mirror::DexCache> dex_cache, 5084 Handle<mirror::ClassLoader> class_loader, 5085 Handle<mirror::ArtMethod> referrer, 5086 InvokeType type) { 5087 DCHECK(dex_cache.Get() != nullptr); 5088 // Check for hit in the dex cache. 5089 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 5090 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 5091 return resolved; 5092 } 5093 // Fail, get the declaring class. 5094 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5095 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 5096 if (klass == nullptr) { 5097 DCHECK(Thread::Current()->IsExceptionPending()); 5098 return nullptr; 5099 } 5100 // Scan using method_idx, this saves string compares but will only hit for matching dex 5101 // caches/files. 5102 switch (type) { 5103 case kDirect: // Fall-through. 5104 case kStatic: 5105 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5106 break; 5107 case kInterface: 5108 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5109 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5110 break; 5111 case kSuper: // Fall-through. 5112 case kVirtual: 5113 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5114 break; 5115 default: 5116 LOG(FATAL) << "Unreachable - invocation type: " << type; 5117 } 5118 if (resolved == nullptr) { 5119 // Search by name, which works across dex files. 5120 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5121 const Signature signature = dex_file.GetMethodSignature(method_id); 5122 switch (type) { 5123 case kDirect: // Fall-through. 5124 case kStatic: 5125 resolved = klass->FindDirectMethod(name, signature); 5126 break; 5127 case kInterface: 5128 resolved = klass->FindInterfaceMethod(name, signature); 5129 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5130 break; 5131 case kSuper: // Fall-through. 5132 case kVirtual: 5133 resolved = klass->FindVirtualMethod(name, signature); 5134 break; 5135 } 5136 } 5137 // If we found a method, check for incompatible class changes. 5138 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5139 // Be a good citizen and update the dex cache to speed subsequent calls. 5140 dex_cache->SetResolvedMethod(method_idx, resolved); 5141 return resolved; 5142 } else { 5143 // If we had a method, it's an incompatible-class-change error. 5144 if (resolved != nullptr) { 5145 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5146 } else { 5147 // We failed to find the method which means either an access error, an incompatible class 5148 // change, or no such method. First try to find the method among direct and virtual methods. 5149 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5150 const Signature signature = dex_file.GetMethodSignature(method_id); 5151 switch (type) { 5152 case kDirect: 5153 case kStatic: 5154 resolved = klass->FindVirtualMethod(name, signature); 5155 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5156 // have had a resolved method before, which triggers the "true" branch above. 5157 break; 5158 case kInterface: 5159 case kVirtual: 5160 case kSuper: 5161 resolved = klass->FindDirectMethod(name, signature); 5162 break; 5163 } 5164 5165 // If we found something, check that it can be accessed by the referrer. 5166 if (resolved != nullptr && referrer.Get() != nullptr) { 5167 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5168 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5169 if (!referring_class->CanAccess(methods_class)) { 5170 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5171 resolved, type); 5172 return nullptr; 5173 } else if (!referring_class->CanAccessMember(methods_class, 5174 resolved->GetAccessFlags())) { 5175 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5176 return nullptr; 5177 } 5178 } 5179 5180 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 5181 // methods and throw if we find the method there. If we find nothing, throw a 5182 // NoSuchMethodError. 5183 switch (type) { 5184 case kDirect: 5185 case kStatic: 5186 if (resolved != nullptr) { 5187 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5188 } else { 5189 resolved = klass->FindInterfaceMethod(name, signature); 5190 if (resolved != nullptr) { 5191 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5192 } else { 5193 ThrowNoSuchMethodError(type, klass, name, signature); 5194 } 5195 } 5196 break; 5197 case kInterface: 5198 if (resolved != nullptr) { 5199 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5200 } else { 5201 resolved = klass->FindVirtualMethod(name, signature); 5202 if (resolved != nullptr) { 5203 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5204 } else { 5205 ThrowNoSuchMethodError(type, klass, name, signature); 5206 } 5207 } 5208 break; 5209 case kSuper: 5210 if (resolved != nullptr) { 5211 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5212 } else { 5213 ThrowNoSuchMethodError(type, klass, name, signature); 5214 } 5215 break; 5216 case kVirtual: 5217 if (resolved != nullptr) { 5218 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5219 } else { 5220 resolved = klass->FindInterfaceMethod(name, signature); 5221 if (resolved != nullptr) { 5222 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5223 } else { 5224 ThrowNoSuchMethodError(type, klass, name, signature); 5225 } 5226 } 5227 break; 5228 } 5229 } 5230 DCHECK(Thread::Current()->IsExceptionPending()); 5231 return nullptr; 5232 } 5233} 5234 5235mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5236 Handle<mirror::DexCache> dex_cache, 5237 Handle<mirror::ClassLoader> class_loader, 5238 bool is_static) { 5239 DCHECK(dex_cache.Get() != nullptr); 5240 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5241 if (resolved != nullptr) { 5242 return resolved; 5243 } 5244 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5245 Thread* const self = Thread::Current(); 5246 StackHandleScope<1> hs(self); 5247 Handle<mirror::Class> klass( 5248 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5249 if (klass.Get() == nullptr) { 5250 DCHECK(Thread::Current()->IsExceptionPending()); 5251 return nullptr; 5252 } 5253 5254 if (is_static) { 5255 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5256 } else { 5257 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5258 } 5259 5260 if (resolved == nullptr) { 5261 const char* name = dex_file.GetFieldName(field_id); 5262 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5263 if (is_static) { 5264 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5265 } else { 5266 resolved = klass->FindInstanceField(name, type); 5267 } 5268 if (resolved == nullptr) { 5269 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5270 return NULL; 5271 } 5272 } 5273 dex_cache->SetResolvedField(field_idx, resolved); 5274 return resolved; 5275} 5276 5277mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5278 uint32_t field_idx, 5279 Handle<mirror::DexCache> dex_cache, 5280 Handle<mirror::ClassLoader> class_loader) { 5281 DCHECK(dex_cache.Get() != nullptr); 5282 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5283 if (resolved != nullptr) { 5284 return resolved; 5285 } 5286 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5287 Thread* self = Thread::Current(); 5288 StackHandleScope<1> hs(self); 5289 Handle<mirror::Class> klass( 5290 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5291 if (klass.Get() == NULL) { 5292 DCHECK(Thread::Current()->IsExceptionPending()); 5293 return NULL; 5294 } 5295 5296 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5297 StringPiece type(dex_file.StringDataByIdx( 5298 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5299 resolved = mirror::Class::FindField(self, klass, name, type); 5300 if (resolved != NULL) { 5301 dex_cache->SetResolvedField(field_idx, resolved); 5302 } else { 5303 ThrowNoSuchFieldError("", klass.Get(), type, name); 5304 } 5305 return resolved; 5306} 5307 5308const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5309 uint32_t* length) { 5310 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5311 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5312 const DexFile& dex_file = *dex_cache->GetDexFile(); 5313 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5314 return dex_file.GetMethodShorty(method_id, length); 5315} 5316 5317void ClassLinker::DumpAllClasses(int flags) { 5318 if (dex_cache_image_class_lookup_required_) { 5319 MoveImageClassesToClassTable(); 5320 } 5321 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5322 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5323 std::vector<mirror::Class*> all_classes; 5324 { 5325 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5326 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5327 mirror::Class* klass = it.second.Read(); 5328 all_classes.push_back(klass); 5329 } 5330 } 5331 5332 for (size_t i = 0; i < all_classes.size(); ++i) { 5333 all_classes[i]->DumpClass(std::cerr, flags); 5334 } 5335} 5336 5337void ClassLinker::DumpForSigQuit(std::ostream& os) { 5338 if (dex_cache_image_class_lookup_required_) { 5339 MoveImageClassesToClassTable(); 5340 } 5341 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5342 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5343} 5344 5345size_t ClassLinker::NumLoadedClasses() { 5346 if (dex_cache_image_class_lookup_required_) { 5347 MoveImageClassesToClassTable(); 5348 } 5349 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5350 return class_table_.size(); 5351} 5352 5353pid_t ClassLinker::GetClassesLockOwner() { 5354 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5355} 5356 5357pid_t ClassLinker::GetDexLockOwner() { 5358 return dex_lock_.GetExclusiveOwnerTid(); 5359} 5360 5361void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5362 DCHECK(!init_done_); 5363 5364 DCHECK(klass != NULL); 5365 DCHECK(klass->GetClassLoader() == NULL); 5366 5367 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5368 DCHECK(class_roots != NULL); 5369 DCHECK(class_roots->Get(class_root) == NULL); 5370 class_roots->Set<false>(class_root, klass); 5371} 5372 5373} // namespace art 5374