class_linker.cc revision c114b5fbc91e6d19ef430d9bc3468386ca61b324
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/accounting/card_table-inl.h" 38#include "gc/accounting/heap_bitmap.h" 39#include "gc/heap.h" 40#include "gc/space/image_space.h" 41#include "handle_scope.h" 42#include "intern_table.h" 43#include "interpreter/interpreter.h" 44#include "leb128.h" 45#include "method_helper.h" 46#include "oat.h" 47#include "oat_file.h" 48#include "object_lock.h" 49#include "mirror/art_field-inl.h" 50#include "mirror/art_method-inl.h" 51#include "mirror/class.h" 52#include "mirror/class-inl.h" 53#include "mirror/class_loader.h" 54#include "mirror/dex_cache-inl.h" 55#include "mirror/iftable-inl.h" 56#include "mirror/object-inl.h" 57#include "mirror/object_array-inl.h" 58#include "mirror/proxy.h" 59#include "mirror/reference-inl.h" 60#include "mirror/stack_trace_element.h" 61#include "mirror/string-inl.h" 62#include "os.h" 63#include "runtime.h" 64#include "entrypoints/entrypoint_utils.h" 65#include "ScopedLocalRef.h" 66#include "scoped_thread_state_change.h" 67#include "handle_scope-inl.h" 68#include "thread.h" 69#include "utils.h" 70#include "verifier/method_verifier.h" 71#include "well_known_classes.h" 72 73namespace art { 74 75static void ThrowNoClassDefFoundError(const char* fmt, ...) 76 __attribute__((__format__(__printf__, 1, 2))) 77 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 78static void ThrowNoClassDefFoundError(const char* fmt, ...) { 79 va_list args; 80 va_start(args, fmt); 81 Thread* self = Thread::Current(); 82 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 83 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 84 va_end(args); 85} 86 87static void ThrowEarlierClassFailure(mirror::Class* c) 88 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 89 // The class failed to initialize on a previous attempt, so we want to throw 90 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 91 // failed in verification, in which case v2 5.4.1 says we need to re-throw 92 // the previous error. 93 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 94 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 95 } 96 97 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 98 Thread* self = Thread::Current(); 99 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 100 if (c->GetVerifyErrorClass() != NULL) { 101 // TODO: change the verifier to store an _instance_, with a useful detail message? 102 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor().c_str(), 103 PrettyDescriptor(c).c_str()); 104 } else { 105 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 106 PrettyDescriptor(c).c_str()); 107 } 108} 109 110static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 111 Thread* self = Thread::Current(); 112 JNIEnv* env = self->GetJniEnv(); 113 114 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 115 CHECK(cause.get() != NULL); 116 117 env->ExceptionClear(); 118 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 119 env->Throw(cause.get()); 120 121 // We only wrap non-Error exceptions; an Error can just be used as-is. 122 if (!is_error) { 123 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 124 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 125 } 126} 127 128static size_t Hash(const char* s) { 129 // This is the java.lang.String hashcode for convenience, not interoperability. 130 size_t hash = 0; 131 for (; *s != '\0'; ++s) { 132 hash = hash * 31 + *s; 133 } 134 return hash; 135} 136 137const char* ClassLinker::class_roots_descriptors_[] = { 138 "Ljava/lang/Class;", 139 "Ljava/lang/Object;", 140 "[Ljava/lang/Class;", 141 "[Ljava/lang/Object;", 142 "Ljava/lang/String;", 143 "Ljava/lang/DexCache;", 144 "Ljava/lang/ref/Reference;", 145 "Ljava/lang/reflect/ArtField;", 146 "Ljava/lang/reflect/ArtMethod;", 147 "Ljava/lang/reflect/Proxy;", 148 "[Ljava/lang/String;", 149 "[Ljava/lang/reflect/ArtField;", 150 "[Ljava/lang/reflect/ArtMethod;", 151 "Ljava/lang/ClassLoader;", 152 "Ljava/lang/Throwable;", 153 "Ljava/lang/ClassNotFoundException;", 154 "Ljava/lang/StackTraceElement;", 155 "Z", 156 "B", 157 "C", 158 "D", 159 "F", 160 "I", 161 "J", 162 "S", 163 "V", 164 "[Z", 165 "[B", 166 "[C", 167 "[D", 168 "[F", 169 "[I", 170 "[J", 171 "[S", 172 "[Ljava/lang/StackTraceElement;", 173}; 174 175ClassLinker::ClassLinker(InternTable* intern_table) 176 // dex_lock_ is recursive as it may be used in stack dumping. 177 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 178 dex_cache_image_class_lookup_required_(false), 179 failed_dex_cache_class_lookups_(0), 180 class_roots_(nullptr), 181 array_iftable_(nullptr), 182 find_array_class_cache_next_victim_(0), 183 init_done_(false), 184 log_new_dex_caches_roots_(false), 185 log_new_class_table_roots_(false), 186 intern_table_(intern_table), 187 portable_resolution_trampoline_(nullptr), 188 quick_resolution_trampoline_(nullptr), 189 portable_imt_conflict_trampoline_(nullptr), 190 quick_imt_conflict_trampoline_(nullptr), 191 quick_generic_jni_trampoline_(nullptr), 192 quick_to_interpreter_bridge_trampoline_(nullptr) { 193 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 194 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 195} 196 197// To set a value for generic JNI. May be necessary in compiler tests. 198extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 199 200void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 201 VLOG(startup) << "ClassLinker::Init"; 202 CHECK(Runtime::Current()->IsCompiler()); 203 204 CHECK(!init_done_); 205 206 // java_lang_Class comes first, it's needed for AllocClass 207 Thread* self = Thread::Current(); 208 gc::Heap* heap = Runtime::Current()->GetHeap(); 209 // The GC can't handle an object with a null class since we can't get the size of this object. 210 heap->IncrementDisableMovingGC(self); 211 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 212 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 213 heap->AllocNonMovableObject<true>(self, nullptr, 214 mirror::Class::ClassClassSize(), 215 VoidFunctor())))); 216 CHECK(java_lang_Class.Get() != NULL); 217 mirror::Class::SetClassClass(java_lang_Class.Get()); 218 java_lang_Class->SetClass(java_lang_Class.Get()); 219 if (kUseBakerOrBrooksReadBarrier) { 220 java_lang_Class->AssertReadBarrierPointer(); 221 } 222 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 223 heap->DecrementDisableMovingGC(self); 224 // AllocClass(mirror::Class*) can now be used 225 226 // Class[] is used for reflection support. 227 Handle<mirror::Class> class_array_class(hs.NewHandle( 228 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 229 class_array_class->SetComponentType(java_lang_Class.Get()); 230 231 // java_lang_Object comes next so that object_array_class can be created. 232 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 233 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 234 CHECK(java_lang_Object.Get() != NULL); 235 // backfill Object as the super class of Class. 236 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 237 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 238 239 // Object[] next to hold class roots. 240 Handle<mirror::Class> object_array_class(hs.NewHandle( 241 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 242 object_array_class->SetComponentType(java_lang_Object.Get()); 243 244 // Setup the char (primitive) class to be used for char[]. 245 Handle<mirror::Class> char_class(hs.NewHandle( 246 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 247 248 // Setup the char[] class to be used for String. 249 Handle<mirror::Class> char_array_class(hs.NewHandle( 250 AllocClass(self, java_lang_Class.Get(), 251 mirror::Array::ClassSize()))); 252 char_array_class->SetComponentType(char_class.Get()); 253 mirror::CharArray::SetArrayClass(char_array_class.Get()); 254 255 // Setup String. 256 Handle<mirror::Class> java_lang_String(hs.NewHandle( 257 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 258 mirror::String::SetClass(java_lang_String.Get()); 259 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 260 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 261 262 // Setup Reference. 263 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 264 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 265 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 266 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 267 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 268 269 // Create storage for root classes, save away our work so far (requires descriptors). 270 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 271 kClassRootsMax); 272 CHECK(class_roots_ != NULL); 273 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 274 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 275 SetClassRoot(kClassArrayClass, class_array_class.Get()); 276 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 277 SetClassRoot(kCharArrayClass, char_array_class.Get()); 278 SetClassRoot(kJavaLangString, java_lang_String.Get()); 279 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 280 281 // Setup the primitive type classes. 282 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 283 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 284 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 285 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 286 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 287 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 288 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 289 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 290 291 // Create array interface entries to populate once we can load system classes. 292 array_iftable_ = AllocIfTable(self, 2); 293 294 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 295 Handle<mirror::Class> int_array_class(hs.NewHandle( 296 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 297 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 298 mirror::IntArray::SetArrayClass(int_array_class.Get()); 299 SetClassRoot(kIntArrayClass, int_array_class.Get()); 300 301 // now that these are registered, we can use AllocClass() and AllocObjectArray 302 303 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 304 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 305 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 306 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 307 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 308 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 309 310 // Constructor, Field, Method, and AbstractMethod are necessary so 311 // that FindClass can link members. 312 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 313 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 314 CHECK(java_lang_reflect_ArtField.Get() != NULL); 315 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 316 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 317 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 318 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 319 320 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 321 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 322 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 323 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 324 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 325 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 326 327 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 328 329 // Set up array classes for string, field, method 330 Handle<mirror::Class> object_array_string(hs.NewHandle( 331 AllocClass(self, java_lang_Class.Get(), 332 mirror::ObjectArray<mirror::String>::ClassSize()))); 333 object_array_string->SetComponentType(java_lang_String.Get()); 334 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 335 336 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 337 AllocClass(self, java_lang_Class.Get(), 338 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 339 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 340 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 341 342 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 343 AllocClass(self, java_lang_Class.Get(), 344 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 345 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 346 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 347 348 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 349 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 350 // these roots. 351 CHECK_NE(0U, boot_class_path.size()); 352 for (size_t i = 0; i != boot_class_path.size(); ++i) { 353 const DexFile* dex_file = boot_class_path[i]; 354 CHECK(dex_file != NULL); 355 AppendToBootClassPath(*dex_file); 356 } 357 358 // now we can use FindSystemClass 359 360 // run char class through InitializePrimitiveClass to finish init 361 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 362 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 363 364 // Create runtime resolution and imt conflict methods. Also setup the default imt. 365 Runtime* runtime = Runtime::Current(); 366 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 367 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 368 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 369 370 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 371 // we do not need friend classes or a publicly exposed setter. 372 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 373 374 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 375 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 376 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 377 CHECK_EQ(java_lang_Object.Get(), Object_class); 378 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 379 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 380 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 381 std::ostringstream os1, os2; 382 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 383 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 384 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 385 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 386 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 387 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 388 CHECK_EQ(java_lang_String.Get(), String_class); 389 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 390 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 391 392 // Setup the primitive array type classes - can't be done until Object has a vtable. 393 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 394 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 395 396 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 397 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 398 399 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 400 CHECK_EQ(char_array_class.Get(), found_char_array_class); 401 402 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 403 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 404 405 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 406 CHECK_EQ(int_array_class.Get(), found_int_array_class); 407 408 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 409 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 410 411 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 412 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 413 414 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 415 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 416 417 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 418 CHECK_EQ(class_array_class.Get(), found_class_array_class); 419 420 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 421 CHECK_EQ(object_array_class.Get(), found_object_array_class); 422 423 // Setup the single, global copy of "iftable". 424 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 425 CHECK(java_lang_Cloneable != NULL); 426 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 427 CHECK(java_io_Serializable != NULL); 428 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 429 // crawl up and explicitly list all of the supers as well. 430 { 431 mirror::IfTable* array_iftable = 432 ReadBarrier::BarrierForRoot<mirror::IfTable, kWithReadBarrier>(&array_iftable_); 433 array_iftable->SetInterface(0, java_lang_Cloneable); 434 array_iftable->SetInterface(1, java_io_Serializable); 435 } 436 437 // Sanity check Class[] and Object[]'s interfaces. 438 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 439 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 440 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 441 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 442 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 443 // dex_cache_ fields and register them in class_table_. 444 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 445 CHECK_EQ(java_lang_Class.Get(), Class_class); 446 447 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 448 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 449 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 450 451 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 452 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 453 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 454 455 mirror::Class* String_array_class = 456 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 457 CHECK_EQ(object_array_string.Get(), String_array_class); 458 459 mirror::Class* Art_method_array_class = 460 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 461 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 462 463 mirror::Class* Art_field_array_class = 464 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 465 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 466 467 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 468 469 // Create java.lang.reflect.Proxy root. 470 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 471 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 472 473 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 474 // finish initializing Reference class 475 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 476 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 477 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 478 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 479 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 480 mirror::Class* java_lang_ref_FinalizerReference = 481 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 482 java_lang_ref_FinalizerReference->SetAccessFlags( 483 java_lang_ref_FinalizerReference->GetAccessFlags() | 484 kAccClassIsReference | kAccClassIsFinalizerReference); 485 mirror::Class* java_lang_ref_PhantomReference = 486 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 487 java_lang_ref_PhantomReference->SetAccessFlags( 488 java_lang_ref_PhantomReference->GetAccessFlags() | 489 kAccClassIsReference | kAccClassIsPhantomReference); 490 mirror::Class* java_lang_ref_SoftReference = 491 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 492 java_lang_ref_SoftReference->SetAccessFlags( 493 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 494 mirror::Class* java_lang_ref_WeakReference = 495 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 496 java_lang_ref_WeakReference->SetAccessFlags( 497 java_lang_ref_WeakReference->GetAccessFlags() | 498 kAccClassIsReference | kAccClassIsWeakReference); 499 500 // Setup the ClassLoader, verifying the object_size_. 501 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 502 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 503 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 504 505 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 506 // java.lang.StackTraceElement as a convenience. 507 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 508 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 509 SetClassRoot(kJavaLangClassNotFoundException, 510 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 511 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 512 SetClassRoot(kJavaLangStackTraceElementArrayClass, 513 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 514 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 515 516 FinishInit(self); 517 518 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 519} 520 521void ClassLinker::FinishInit(Thread* self) { 522 VLOG(startup) << "ClassLinker::FinishInit entering"; 523 524 // Let the heap know some key offsets into java.lang.ref instances 525 // Note: we hard code the field indexes here rather than using FindInstanceField 526 // as the types of the field can't be resolved prior to the runtime being 527 // fully initialized 528 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 529 mirror::Class* java_lang_ref_FinalizerReference = 530 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 531 532 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 533 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 534 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 535 536 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 537 CHECK_STREQ(queue->GetName(), "queue"); 538 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 539 540 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 541 CHECK_STREQ(queueNext->GetName(), "queueNext"); 542 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 543 544 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 545 CHECK_STREQ(referent->GetName(), "referent"); 546 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 547 548 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 549 CHECK_STREQ(zombie->GetName(), "zombie"); 550 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 551 552 // ensure all class_roots_ are initialized 553 for (size_t i = 0; i < kClassRootsMax; i++) { 554 ClassRoot class_root = static_cast<ClassRoot>(i); 555 mirror::Class* klass = GetClassRoot(class_root); 556 CHECK(klass != NULL); 557 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 558 // note SetClassRoot does additional validation. 559 // if possible add new checks there to catch errors early 560 } 561 562 CHECK(array_iftable_ != NULL); 563 564 // disable the slow paths in FindClass and CreatePrimitiveClass now 565 // that Object, Class, and Object[] are setup 566 init_done_ = true; 567 568 VLOG(startup) << "ClassLinker::FinishInit exiting"; 569} 570 571void ClassLinker::RunRootClinits() { 572 Thread* self = Thread::Current(); 573 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 574 mirror::Class* c = GetClassRoot(ClassRoot(i)); 575 if (!c->IsArrayClass() && !c->IsPrimitive()) { 576 StackHandleScope<1> hs(self); 577 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 578 EnsureInitialized(h_class, true, true); 579 self->AssertNoPendingException(); 580 } 581 } 582} 583 584bool ClassLinker::GenerateOatFile(const char* dex_filename, 585 int oat_fd, 586 const char* oat_cache_filename, 587 std::string* error_msg) { 588 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 589 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 590 591 gc::Heap* heap = Runtime::Current()->GetHeap(); 592 std::string boot_image_option("--boot-image="); 593 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 594 595 std::string dex_file_option("--dex-file="); 596 dex_file_option += dex_filename; 597 598 std::string oat_fd_option("--oat-fd="); 599 StringAppendF(&oat_fd_option, "%d", oat_fd); 600 601 std::string oat_location_option("--oat-location="); 602 oat_location_option += oat_cache_filename; 603 604 std::vector<std::string> argv; 605 argv.push_back(dex2oat); 606 argv.push_back("--runtime-arg"); 607 argv.push_back("-classpath"); 608 argv.push_back("--runtime-arg"); 609 argv.push_back(Runtime::Current()->GetClassPathString()); 610 611 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 612 613 if (!Runtime::Current()->IsVerificationEnabled()) { 614 argv.push_back("--compiler-filter=verify-none"); 615 } 616 617 if (!kIsTargetBuild) { 618 argv.push_back("--host"); 619 } 620 621 argv.push_back(boot_image_option); 622 argv.push_back(dex_file_option); 623 argv.push_back(oat_fd_option); 624 argv.push_back(oat_location_option); 625 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 626 for (size_t i = 0; i < compiler_options.size(); ++i) { 627 argv.push_back(compiler_options[i].c_str()); 628 } 629 630 return Exec(argv, error_msg); 631} 632 633const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 634 WriterMutexLock mu(Thread::Current(), dex_lock_); 635 if (kIsDebugBuild) { 636 for (size_t i = 0; i < oat_files_.size(); ++i) { 637 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 638 } 639 } 640 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 641 oat_files_.push_back(oat_file); 642 return oat_file; 643} 644 645OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 646 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 647 OatFile* oat_file = space->ReleaseOatFile(); 648 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 649 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 650 return *oat_file; 651} 652 653const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 654 const char* dex_location = dex_file.GetLocation().c_str(); 655 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 656 return FindOpenedOatFile(nullptr, dex_location, &dex_location_checksum); 657} 658 659const OatFile* ClassLinker::FindOpenedOatFile(const char* oat_location, const char* dex_location, 660 const uint32_t* const dex_location_checksum) { 661 ReaderMutexLock mu(Thread::Current(), dex_lock_); 662 for (size_t i = 0; i < oat_files_.size(); i++) { 663 const OatFile* oat_file = oat_files_[i]; 664 DCHECK(oat_file != NULL); 665 666 if (oat_location != nullptr) { 667 if (oat_file->GetLocation() != oat_location) { 668 continue; 669 } 670 } 671 672 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 673 dex_location_checksum, 674 false); 675 if (oat_dex_file != NULL) { 676 return oat_file; 677 } 678 } 679 return NULL; 680} 681 682static std::string GetMultiDexClassesDexName(size_t number, const char* dex_location) { 683 if (number == 0) { 684 return dex_location; 685 } else { 686 return StringPrintf("%s" kMultiDexSeparatorString "classes%zu.dex", dex_location, number + 1); 687 } 688} 689 690static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, const char* dex_location, 691 bool generated, 692 std::vector<std::string>* error_msgs, 693 std::vector<const DexFile*>* dex_files) { 694 if (oat_file == nullptr) { 695 return false; 696 } 697 698 size_t old_size = dex_files->size(); // To rollback on error. 699 700 bool success = true; 701 for (size_t i = 0; success; ++i) { 702 std::string next_name_str = GetMultiDexClassesDexName(i, dex_location); 703 const char* next_name = next_name_str.c_str(); 704 705 uint32_t dex_location_checksum; 706 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 707 std::string error_msg; 708 if (!DexFile::GetChecksum(next_name, dex_location_checksum_pointer, &error_msg)) { 709 DCHECK_EQ(false, i == 0 && generated); 710 dex_location_checksum_pointer = nullptr; 711 } 712 713 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 714 715 if (oat_dex_file == nullptr) { 716 if (i == 0 && generated) { 717 std::string error_msg; 718 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 719 " file'%s'", dex_location, dex_location_checksum, 720 oat_file->GetLocation().c_str()); 721 error_msgs->push_back(error_msg); 722 } 723 break; // Not found, done. 724 } 725 726 // Checksum test. Test must succeed when generated. 727 success = !generated; 728 if (dex_location_checksum_pointer != nullptr) { 729 success = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 730 } 731 732 if (success) { 733 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 734 if (dex_file == nullptr) { 735 success = false; 736 error_msgs->push_back(error_msg); 737 } else { 738 dex_files->push_back(dex_file); 739 } 740 } 741 742 // When we generated the file, we expect success, or something is terribly wrong. 743 CHECK_EQ(false, generated && !success) 744 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 745 << std::hex << " dex_location_checksum=" << dex_location_checksum 746 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 747 } 748 749 if (dex_files->size() == old_size) { 750 success = false; // We did not even find classes.dex 751 } 752 753 if (success) { 754 return true; 755 } else { 756 // Free all the dex files we have loaded. 757 auto it = dex_files->begin() + old_size; 758 auto it_end = dex_files->end(); 759 for (; it != it_end; it++) { 760 delete *it; 761 } 762 dex_files->erase(dex_files->begin() + old_size, it_end); 763 764 return false; 765 } 766} 767 768// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 769// complicates the loading process, as we should not use an iterative loading process, because that 770// would register the oat file and dex files that come before the broken one. Instead, check all 771// multidex ahead of time. 772bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 773 std::vector<std::string>* error_msgs, 774 std::vector<const DexFile*>* dex_files) { 775 // 1) Check whether we have an open oat file. 776 // This requires a dex checksum, use the "primary" one. 777 uint32_t dex_location_checksum; 778 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 779 bool have_checksum = true; 780 std::string checksum_error_msg; 781 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 782 dex_location_checksum_pointer = nullptr; 783 have_checksum = false; 784 } 785 786 bool needs_registering = false; 787 788 std::unique_ptr<const OatFile> open_oat_file(FindOpenedOatFile(oat_location, dex_location, 789 dex_location_checksum_pointer)); 790 791 // 2) If we do not have an open one, maybe there's one on disk already. 792 793 // In case the oat file is not open, we play a locking game here so 794 // that if two different processes race to load and register or generate 795 // (or worse, one tries to open a partial generated file) we will be okay. 796 // This is actually common with apps that use DexClassLoader to work 797 // around the dex method reference limit and that have a background 798 // service running in a separate process. 799 ScopedFlock scoped_flock; 800 801 if (open_oat_file.get() == nullptr) { 802 if (oat_location != nullptr) { 803 // Can only do this if we have a checksum, else error. 804 if (!have_checksum) { 805 error_msgs->push_back(checksum_error_msg); 806 return false; 807 } 808 809 std::string error_msg; 810 811 // We are loading or creating one in the future. Time to set up the file lock. 812 if (!scoped_flock.Init(oat_location, &error_msg)) { 813 error_msgs->push_back(error_msg); 814 return false; 815 } 816 817 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 818 oat_location, &error_msg)); 819 820 if (open_oat_file.get() == nullptr) { 821 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 822 dex_location, oat_location, error_msg.c_str()); 823 VLOG(class_linker) << compound_msg; 824 error_msgs->push_back(compound_msg); 825 } 826 } else { 827 // TODO: What to lock here? 828 bool obsolete_file_cleanup_failed; 829 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 830 dex_location_checksum_pointer, 831 kRuntimeISA, error_msgs, 832 &obsolete_file_cleanup_failed)); 833 // There's no point in going forward and eventually try to regenerate the 834 // file if we couldn't remove the obsolete one. Mostly likely we will fail 835 // with the same error when trying to write the new file. 836 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 837 if (obsolete_file_cleanup_failed) { 838 return false; 839 } 840 } 841 needs_registering = true; 842 } 843 844 // 3) If we have an oat file, check all contained multidex files for our dex_location. 845 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 846 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, false, error_msgs, 847 dex_files); 848 if (success) { 849 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 850 if (needs_registering) { 851 // We opened the oat file, so we must register it. 852 RegisterOatFile(oat_file); 853 } 854 return true; 855 } else { 856 if (needs_registering) { 857 // We opened it, delete it. 858 open_oat_file.reset(); 859 } else { 860 open_oat_file.release(); // Do not delete open oat files. 861 } 862 } 863 864 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 865 866 // Need a checksum, fail else. 867 if (!have_checksum) { 868 error_msgs->push_back(checksum_error_msg); 869 return false; 870 } 871 872 // Look in cache location if no oat_location is given. 873 std::string cache_location; 874 if (oat_location == nullptr) { 875 // Use the dalvik cache. 876 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 877 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 878 oat_location = cache_location.c_str(); 879 } 880 881 // Definitely need to lock now. 882 if (!scoped_flock.HasFile()) { 883 std::string error_msg; 884 if (!scoped_flock.Init(oat_location, &error_msg)) { 885 error_msgs->push_back(error_msg); 886 return false; 887 } 888 } 889 890 // Create the oat file. 891 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 892 oat_location, error_msgs)); 893 894 // Failed, bail. 895 if (open_oat_file.get() == nullptr) { 896 return false; 897 } 898 899 // Try to load again, but stronger checks. 900 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, true, error_msgs, 901 dex_files); 902 if (success) { 903 RegisterOatFile(open_oat_file.release()); 904 return true; 905 } else { 906 return false; 907 } 908} 909 910const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 911 uint32_t dex_location_checksum, 912 const char* oat_location, 913 std::string* error_msg) { 914 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 915 !Runtime::Current()->IsCompiler(), 916 error_msg)); 917 if (oat_file.get() == nullptr) { 918 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 919 error_msg->c_str()); 920 return nullptr; 921 } 922 Runtime* runtime = Runtime::Current(); 923 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 924 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 925 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 926 if (expected_image_oat_checksum != actual_image_oat_checksum) { 927 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 928 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 929 actual_image_oat_checksum); 930 return nullptr; 931 } 932 933 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 934 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 935 if (expected_image_oat_offset != actual_image_oat_offset) { 936 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 937 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 938 actual_image_oat_offset); 939 return nullptr; 940 } 941 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 942 &dex_location_checksum); 943 if (oat_dex_file == nullptr) { 944 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 945 dex_location); 946 return nullptr; 947 } 948 uint32_t expected_dex_checksum = dex_location_checksum; 949 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 950 if (expected_dex_checksum != actual_dex_checksum) { 951 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 952 "found 0x%x", oat_location, expected_dex_checksum, 953 actual_dex_checksum); 954 return nullptr; 955 } 956 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 957 if (dex_file.get() != nullptr) { 958 return oat_file.release(); 959 } else { 960 return nullptr; 961 } 962} 963 964const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 965 int fd, const char* oat_location, 966 std::vector<std::string>* error_msgs) { 967 // Generate the output oat file for the dex file 968 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 969 std::string error_msg; 970 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 971 CHECK(!error_msg.empty()); 972 error_msgs->push_back(error_msg); 973 return nullptr; 974 } 975 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 976 !Runtime::Current()->IsCompiler(), 977 &error_msg)); 978 if (oat_file.get() == nullptr) { 979 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 980 oat_location, error_msg.c_str()); 981 error_msgs->push_back(compound_msg); 982 return nullptr; 983 } 984 985 return oat_file.release(); 986} 987 988bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 989 const char* dex_location, 990 uint32_t dex_location_checksum, 991 const InstructionSet instruction_set, 992 std::string* error_msg) { 993 Runtime* runtime = Runtime::Current(); 994 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 995 996 // If the requested instruction set is the same as the current runtime, 997 // we can use the checksums directly. If it isn't, we'll have to read the 998 // image header from the image for the right instruction set. 999 uint32_t image_oat_checksum = 0; 1000 uintptr_t image_oat_data_begin = 0; 1001 if (instruction_set == kRuntimeISA) { 1002 const ImageHeader& image_header = image_space->GetImageHeader(); 1003 image_oat_checksum = image_header.GetOatChecksum(); 1004 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1005 } else { 1006 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1007 image_space->GetImageLocation().c_str(), instruction_set)); 1008 image_oat_checksum = image_header->GetOatChecksum(); 1009 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1010 } 1011 const OatHeader& oat_header = oat_file->GetOatHeader(); 1012 bool image_check = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1013 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1014 1015 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1016 &dex_location_checksum); 1017 if (oat_dex_file == NULL) { 1018 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1019 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1020 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 1021 for (size_t i = 0; i < oat_dex_files.size(); i++) { 1022 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 1023 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 1024 oat_file->GetLocation().c_str(), 1025 oat_dex_file->GetDexFileLocation().c_str()); 1026 } 1027 return false; 1028 } 1029 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 1030 1031 if (image_check && dex_check) { 1032 return true; 1033 } 1034 1035 if (!image_check) { 1036 ScopedObjectAccess soa(Thread::Current()); 1037 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with (0x%x, %" PRIdPTR ")", 1038 oat_file->GetLocation().c_str(), 1039 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1040 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1041 image_oat_checksum, image_oat_data_begin); 1042 } 1043 if (!dex_check) { 1044 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1045 oat_file->GetLocation().c_str(), 1046 oat_dex_file->GetDexFileLocationChecksum(), 1047 dex_location, dex_location_checksum); 1048 } 1049 return false; 1050} 1051 1052const OatFile* ClassLinker::LoadOatFileAndVerifyDexFile(const std::string& oat_file_location, 1053 const char* dex_location, 1054 std::string* error_msg, 1055 bool* open_failed) { 1056 std::unique_ptr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 1057 if (oat_file.get() == nullptr) { 1058 *open_failed = true; 1059 return nullptr; 1060 } 1061 *open_failed = false; 1062 std::unique_ptr<const DexFile> dex_file; 1063 uint32_t dex_location_checksum; 1064 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 1065 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1066 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1067 // directory. 1068 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1069 if (oat_dex_file == nullptr) { 1070 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1071 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 1072 error_msg->c_str()); 1073 return nullptr; 1074 } 1075 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1076 } else { 1077 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 1078 kRuntimeISA, error_msg); 1079 if (!verified) { 1080 return nullptr; 1081 } 1082 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1083 &dex_location_checksum)->OpenDexFile(error_msg)); 1084 } 1085 1086 if (dex_file.get() != nullptr) { 1087 return oat_file.release(); 1088 } else { 1089 return nullptr; 1090 } 1091} 1092 1093const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1094 const char* dex_location, 1095 const uint32_t* const dex_location_checksum, 1096 InstructionSet isa, 1097 std::vector<std::string>* error_msgs, 1098 bool* obsolete_file_cleanup_failed) { 1099 *obsolete_file_cleanup_failed = false; 1100 // Look for an existing file next to dex. for example, for 1101 // /foo/bar/baz.jar, look for /foo/bar/<isa>/baz.odex. 1102 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1103 bool open_failed; 1104 std::string error_msg; 1105 const OatFile* oat_file = LoadOatFileAndVerifyDexFile(odex_filename, dex_location, &error_msg, 1106 &open_failed); 1107 if (oat_file != nullptr) { 1108 return oat_file; 1109 } 1110 if (dex_location_checksum == nullptr) { 1111 error_msgs->push_back(StringPrintf("Failed to open oat file from %s and no classes.dex found in" 1112 "%s: %s", odex_filename.c_str(), dex_location, 1113 error_msg.c_str())); 1114 return nullptr; 1115 } 1116 1117 std::string cache_error_msg; 1118 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 1119 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location, 1120 dalvik_cache.c_str())); 1121 oat_file = LoadOatFileAndVerifyDexFile(cache_location, dex_location, &cache_error_msg, 1122 &open_failed); 1123 if (oat_file != nullptr) { 1124 return oat_file; 1125 } 1126 1127 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 1128 std::string error_msg = StringPrintf("Failed to remove obsolete file from %s when searching" 1129 "for dex file %s: %s", 1130 cache_location.c_str(), dex_location, strerror(errno)); 1131 error_msgs->push_back(error_msg); 1132 VLOG(class_linker) << error_msg; 1133 // Let the caller know that we couldn't remove the obsolete file. 1134 // This is a good indication that further writes may fail as well. 1135 *obsolete_file_cleanup_failed = true; 1136 } 1137 1138 std::string compound_msg = StringPrintf("Failed to open oat file from %s (error '%s') or %s " 1139 "(error '%s').", odex_filename.c_str(), error_msg.c_str(), 1140 cache_location.c_str(), cache_error_msg.c_str()); 1141 VLOG(class_linker) << compound_msg; 1142 error_msgs->push_back(compound_msg); 1143 1144 return nullptr; 1145} 1146 1147const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1148 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1149 for (size_t i = 0; i < oat_files_.size(); i++) { 1150 const OatFile* oat_file = oat_files_[i]; 1151 DCHECK(oat_file != nullptr); 1152 if (oat_file->GetLocation() == oat_location) { 1153 return oat_file; 1154 } 1155 } 1156 return nullptr; 1157} 1158 1159const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1160 std::string* error_msg) { 1161 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1162 if (oat_file != nullptr) { 1163 return oat_file; 1164 } 1165 1166 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1167 error_msg); 1168 if (oat_file == NULL) { 1169 return NULL; 1170 } 1171 return oat_file; 1172} 1173 1174static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1175 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1176 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1177 1178 DCHECK(obj != NULL); 1179 DCHECK(class_linker != NULL); 1180 1181 if (obj->IsArtMethod()) { 1182 mirror::ArtMethod* method = obj->AsArtMethod(); 1183 if (!method->IsNative()) { 1184 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1185 if (method != Runtime::Current()->GetResolutionMethod()) { 1186 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1187 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1188 } 1189 } 1190 } 1191} 1192 1193void ClassLinker::InitFromImage() { 1194 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1195 CHECK(!init_done_); 1196 1197 Thread* self = Thread::Current(); 1198 gc::Heap* heap = Runtime::Current()->GetHeap(); 1199 gc::space::ImageSpace* space = heap->GetImageSpace(); 1200 dex_cache_image_class_lookup_required_ = true; 1201 CHECK(space != NULL); 1202 OatFile& oat_file = GetImageOatFile(space); 1203 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1204 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1205 const char* image_file_location = oat_file.GetOatHeader(). 1206 GetStoreValueByKey(OatHeader::kImageLocationKey); 1207 CHECK(image_file_location == nullptr || *image_file_location == 0); 1208 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1209 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1210 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1211 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1212 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1213 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1214 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1215 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1216 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1217 1218 StackHandleScope<1> hs(self); 1219 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1220 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1221 AsObjectArray<mirror::Class>())); 1222 class_roots_ = class_roots.Get(); 1223 1224 // Special case of setting up the String class early so that we can test arbitrary objects 1225 // as being Strings or not 1226 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1227 1228 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1229 static_cast<uint32_t>(dex_caches->GetLength())); 1230 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1231 StackHandleScope<1> hs(self); 1232 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1233 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1234 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1235 nullptr); 1236 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1237 std::string error_msg; 1238 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1239 if (dex_file == NULL) { 1240 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1241 << " from within oat file " << oat_file.GetLocation() 1242 << " error '" << error_msg << "'"; 1243 } 1244 1245 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1246 1247 AppendToBootClassPath(*dex_file, dex_cache); 1248 } 1249 1250 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1251 // bitmap walk. 1252 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1253 1254 // Set entry point to interpreter if in InterpretOnly mode. 1255 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1256 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1257 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1258 } 1259 1260 // reinit class_roots_ 1261 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1262 class_roots_ = class_roots.Get(); 1263 1264 // reinit array_iftable_ from any array class instance, they should be == 1265 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1266 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1267 // String class root was set above 1268 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1269 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1270 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1271 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1272 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1273 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1274 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1275 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1276 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1277 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1278 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1279 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1280 1281 FinishInit(self); 1282 1283 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1284} 1285 1286void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1287 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1288 if ((flags & kVisitRootFlagAllRoots) != 0) { 1289 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1290 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1291 } 1292 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1293 for (auto& pair : new_class_roots_) { 1294 mirror::Object* old_ref = pair.second; 1295 callback(reinterpret_cast<mirror::Object**>(&pair.second), arg, 0, kRootStickyClass); 1296 if (UNLIKELY(pair.second != old_ref)) { 1297 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1298 // corresponding object. This is slow, but luckily for us, this may only happen with a 1299 // concurrent moving GC. 1300 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1301 it != end && it->first == pair.first; ++it) { 1302 // If the class stored matches the old class, update it to the new value. 1303 if (old_ref == it->second) { 1304 it->second = pair.second; 1305 } 1306 } 1307 } 1308 } 1309 } 1310 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1311 new_class_roots_.clear(); 1312 } 1313 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1314 log_new_class_table_roots_ = true; 1315 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1316 log_new_class_table_roots_ = false; 1317 } 1318 // We deliberately ignore the class roots in the image since we 1319 // handle image roots by using the MS/CMS rescanning of dirty cards. 1320} 1321 1322// Keep in sync with InitCallback. Anything we visit, we need to 1323// reinit references to when reinitializing a ClassLinker from a 1324// mapped image. 1325void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1326 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1327 Thread* self = Thread::Current(); 1328 { 1329 ReaderMutexLock mu(self, dex_lock_); 1330 if ((flags & kVisitRootFlagAllRoots) != 0) { 1331 for (mirror::DexCache*& dex_cache : dex_caches_) { 1332 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1333 } 1334 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1335 for (size_t index : new_dex_cache_roots_) { 1336 callback(reinterpret_cast<mirror::Object**>(&dex_caches_[index]), arg, 0, kRootVMInternal); 1337 } 1338 } 1339 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1340 new_dex_cache_roots_.clear(); 1341 } 1342 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1343 log_new_dex_caches_roots_ = true; 1344 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1345 log_new_dex_caches_roots_ = false; 1346 } 1347 } 1348 VisitClassRoots(callback, arg, flags); 1349 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1350 DCHECK(array_iftable_ != nullptr); 1351 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1352 if (find_array_class_cache_[i] != nullptr) { 1353 callback(reinterpret_cast<mirror::Object**>(&find_array_class_cache_[i]), arg, 0, 1354 kRootVMInternal); 1355 } 1356 } 1357} 1358 1359void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1360 if (dex_cache_image_class_lookup_required_) { 1361 MoveImageClassesToClassTable(); 1362 } 1363 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1364 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1365 mirror::Class** root = &it.second; 1366 mirror::Class* c = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 1367 if (!visitor(c, arg)) { 1368 return; 1369 } 1370 } 1371} 1372 1373static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1374 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1375 classes->insert(c); 1376 return true; 1377} 1378 1379void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1380 std::set<mirror::Class*> classes; 1381 VisitClasses(GetClassesVisitor, &classes); 1382 for (mirror::Class* klass : classes) { 1383 if (!visitor(klass, arg)) { 1384 return; 1385 } 1386 } 1387} 1388 1389ClassLinker::~ClassLinker() { 1390 mirror::Class::ResetClass(); 1391 mirror::String::ResetClass(); 1392 mirror::Reference::ResetClass(); 1393 mirror::ArtField::ResetClass(); 1394 mirror::ArtMethod::ResetClass(); 1395 mirror::BooleanArray::ResetArrayClass(); 1396 mirror::ByteArray::ResetArrayClass(); 1397 mirror::CharArray::ResetArrayClass(); 1398 mirror::DoubleArray::ResetArrayClass(); 1399 mirror::FloatArray::ResetArrayClass(); 1400 mirror::IntArray::ResetArrayClass(); 1401 mirror::LongArray::ResetArrayClass(); 1402 mirror::ShortArray::ResetArrayClass(); 1403 mirror::Throwable::ResetClass(); 1404 mirror::StackTraceElement::ResetClass(); 1405 STLDeleteElements(&boot_class_path_); 1406 STLDeleteElements(&oat_files_); 1407} 1408 1409mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1410 gc::Heap* heap = Runtime::Current()->GetHeap(); 1411 StackHandleScope<16> hs(self); 1412 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1413 Handle<mirror::DexCache> dex_cache( 1414 hs.NewHandle(down_cast<mirror::DexCache*>( 1415 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1416 VoidFunctor())))); 1417 if (dex_cache.Get() == NULL) { 1418 return NULL; 1419 } 1420 Handle<mirror::String> 1421 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1422 if (location.Get() == NULL) { 1423 return NULL; 1424 } 1425 Handle<mirror::ObjectArray<mirror::String>> 1426 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1427 if (strings.Get() == NULL) { 1428 return NULL; 1429 } 1430 Handle<mirror::ObjectArray<mirror::Class>> 1431 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1432 if (types.Get() == NULL) { 1433 return NULL; 1434 } 1435 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1436 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1437 if (methods.Get() == NULL) { 1438 return NULL; 1439 } 1440 Handle<mirror::ObjectArray<mirror::ArtField>> 1441 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1442 if (fields.Get() == NULL) { 1443 return NULL; 1444 } 1445 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1446 fields.Get()); 1447 return dex_cache.Get(); 1448} 1449 1450mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1451 uint32_t class_size) { 1452 DCHECK_GE(class_size, sizeof(mirror::Class)); 1453 gc::Heap* heap = Runtime::Current()->GetHeap(); 1454 mirror::Class::InitializeClassVisitor visitor(class_size); 1455 mirror::Object* k = kMovingClasses ? 1456 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1457 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1458 if (UNLIKELY(k == nullptr)) { 1459 CHECK(self->IsExceptionPending()); // OOME. 1460 return nullptr; 1461 } 1462 return k->AsClass(); 1463} 1464 1465mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1466 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1467} 1468 1469mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1470 return down_cast<mirror::ArtField*>( 1471 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1472} 1473 1474mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1475 return down_cast<mirror::ArtMethod*>( 1476 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1477} 1478 1479mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1480 Thread* self, size_t length) { 1481 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1482 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1483} 1484 1485mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1486 mirror::Class* klass) { 1487 DCHECK(klass != NULL); 1488 1489 // For temporary classes we must wait for them to be retired. 1490 if (init_done_ && klass->IsTemp()) { 1491 CHECK(!klass->IsResolved()); 1492 if (klass->IsErroneous()) { 1493 ThrowEarlierClassFailure(klass); 1494 return nullptr; 1495 } 1496 StackHandleScope<1> hs(self); 1497 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1498 ObjectLock<mirror::Class> lock(self, h_class); 1499 // Loop and wait for the resolving thread to retire this class. 1500 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1501 lock.WaitIgnoringInterrupts(); 1502 } 1503 if (h_class->IsErroneous()) { 1504 ThrowEarlierClassFailure(h_class.Get()); 1505 return nullptr; 1506 } 1507 CHECK(h_class->IsRetired()); 1508 // Get the updated class from class table. 1509 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1510 } 1511 1512 // Wait for the class if it has not already been linked. 1513 if (!klass->IsResolved() && !klass->IsErroneous()) { 1514 StackHandleScope<1> hs(self); 1515 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1516 ObjectLock<mirror::Class> lock(self, h_class); 1517 // Check for circular dependencies between classes. 1518 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1519 ThrowClassCircularityError(h_class.Get()); 1520 h_class->SetStatus(mirror::Class::kStatusError, self); 1521 return nullptr; 1522 } 1523 // Wait for the pending initialization to complete. 1524 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1525 lock.WaitIgnoringInterrupts(); 1526 } 1527 } 1528 1529 if (klass->IsErroneous()) { 1530 ThrowEarlierClassFailure(klass); 1531 return nullptr; 1532 } 1533 // Return the loaded class. No exceptions should be pending. 1534 CHECK(klass->IsResolved()) << PrettyClass(klass); 1535 self->AssertNoPendingException(); 1536 return klass; 1537} 1538 1539mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1540 Handle<mirror::ClassLoader> class_loader) { 1541 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1542 DCHECK(self != nullptr); 1543 self->AssertNoPendingException(); 1544 if (descriptor[1] == '\0') { 1545 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1546 // for primitive classes that aren't backed by dex files. 1547 return FindPrimitiveClass(descriptor[0]); 1548 } 1549 // Find the class in the loaded classes table. 1550 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1551 if (klass != NULL) { 1552 return EnsureResolved(self, descriptor, klass); 1553 } 1554 // Class is not yet loaded. 1555 if (descriptor[0] == '[') { 1556 return CreateArrayClass(self, descriptor, class_loader); 1557 } else if (class_loader.Get() == nullptr) { 1558 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1559 if (pair.second != NULL) { 1560 StackHandleScope<1> hs(self); 1561 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1562 } 1563 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1564 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1565 // throw of a NoClassDefFoundError. 1566 if (IsInBootClassPath(descriptor)) { 1567 mirror::Class* system_class = FindSystemClass(self, descriptor); 1568 CHECK(system_class != NULL); 1569 return system_class; 1570 } 1571 // Next try the compile time class path. 1572 const std::vector<const DexFile*>* class_path; 1573 { 1574 ScopedObjectAccessUnchecked soa(self); 1575 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1576 soa.AddLocalReference<jobject>(class_loader.Get())); 1577 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1578 } 1579 1580 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1581 if (pair.second != NULL) { 1582 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1583 } 1584 1585 } else { 1586 ScopedObjectAccessUnchecked soa(self); 1587 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1588 soa.AddLocalReference<jobject>(class_loader.Get())); 1589 std::string class_name_string(DescriptorToDot(descriptor)); 1590 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1591 { 1592 ScopedThreadStateChange tsc(self, kNative); 1593 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1594 soa.Env()->NewStringUTF(class_name_string.c_str())); 1595 if (class_name_object.get() == NULL) { 1596 return NULL; 1597 } 1598 CHECK(class_loader_object.get() != NULL); 1599 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1600 WellKnownClasses::java_lang_ClassLoader_loadClass, 1601 class_name_object.get())); 1602 } 1603 if (self->IsExceptionPending()) { 1604 // If the ClassLoader threw, pass that exception up. 1605 return NULL; 1606 } else if (result.get() == NULL) { 1607 // broken loader - throw NPE to be compatible with Dalvik 1608 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1609 class_name_string.c_str()).c_str()); 1610 return NULL; 1611 } else { 1612 // success, return mirror::Class* 1613 return soa.Decode<mirror::Class*>(result.get()); 1614 } 1615 } 1616 1617 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1618 return NULL; 1619} 1620 1621mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1622 Handle<mirror::ClassLoader> class_loader, 1623 const DexFile& dex_file, 1624 const DexFile::ClassDef& dex_class_def) { 1625 Thread* self = Thread::Current(); 1626 StackHandleScope<3> hs(self); 1627 auto klass = hs.NewHandle<mirror::Class>(nullptr); 1628 bool should_allocate = false; 1629 1630 // Load the class from the dex file. 1631 if (UNLIKELY(!init_done_)) { 1632 // finish up init of hand crafted class_roots_ 1633 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1634 klass.Assign(GetClassRoot(kJavaLangObject)); 1635 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1636 klass.Assign(GetClassRoot(kJavaLangClass)); 1637 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1638 klass.Assign(GetClassRoot(kJavaLangString)); 1639 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 1640 klass.Assign(GetClassRoot(kJavaLangRefReference)); 1641 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1642 klass.Assign(GetClassRoot(kJavaLangDexCache)); 1643 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1644 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 1645 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1646 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 1647 } else { 1648 should_allocate = true; 1649 } 1650 } else { 1651 should_allocate = true; 1652 } 1653 1654 if (should_allocate) { 1655 // Allocate a class with the status of not ready. 1656 // Interface object should get the right size here. Regular class will 1657 // figure out the right size later and be replaced with one of the right 1658 // size when the class becomes resolved. 1659 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 1660 } 1661 if (UNLIKELY(klass.Get() == nullptr)) { 1662 CHECK(self->IsExceptionPending()); // Expect an OOME. 1663 return nullptr; 1664 } 1665 klass->SetDexCache(FindDexCache(dex_file)); 1666 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 1667 ObjectLock<mirror::Class> lock(self, klass); 1668 if (self->IsExceptionPending()) { 1669 // An exception occured during load, set status to erroneous while holding klass' lock in case 1670 // notification is necessary. 1671 klass->SetStatus(mirror::Class::kStatusError, self); 1672 return nullptr; 1673 } 1674 klass->SetClinitThreadId(self->GetTid()); 1675 1676 // Add the newly loaded class to the loaded classes table. 1677 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 1678 if (existing != nullptr) { 1679 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1680 // this thread to block. 1681 return EnsureResolved(self, descriptor, existing); 1682 } 1683 1684 // Finish loading (if necessary) by finding parents 1685 CHECK(!klass->IsLoaded()); 1686 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1687 // Loading failed. 1688 klass->SetStatus(mirror::Class::kStatusError, self); 1689 return nullptr; 1690 } 1691 CHECK(klass->IsLoaded()); 1692 // Link the class (if necessary) 1693 CHECK(!klass->IsResolved()); 1694 // TODO: Use fast jobjects? 1695 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1696 1697 mirror::Class* new_class = nullptr; 1698 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 1699 // Linking failed. 1700 klass->SetStatus(mirror::Class::kStatusError, self); 1701 return nullptr; 1702 } 1703 CHECK(new_class != nullptr) << descriptor; 1704 CHECK(new_class->IsResolved()) << descriptor; 1705 1706 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 1707 1708 /* 1709 * We send CLASS_PREPARE events to the debugger from here. The 1710 * definition of "preparation" is creating the static fields for a 1711 * class and initializing them to the standard default values, but not 1712 * executing any code (that comes later, during "initialization"). 1713 * 1714 * We did the static preparation in LinkClass. 1715 * 1716 * The class has been prepared and resolved but possibly not yet verified 1717 * at this point. 1718 */ 1719 Dbg::PostClassPrepare(new_class_h.Get()); 1720 1721 return new_class_h.Get(); 1722} 1723 1724uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 1725 const DexFile::ClassDef& dex_class_def) { 1726 const byte* class_data = dex_file.GetClassData(dex_class_def); 1727 size_t num_ref = 0; 1728 size_t num_32 = 0; 1729 size_t num_64 = 0; 1730 if (class_data != NULL) { 1731 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1732 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1733 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1734 char c = descriptor[0]; 1735 if (c == 'L' || c == '[') { 1736 num_ref++; 1737 } else if (c == 'J' || c == 'D') { 1738 num_64++; 1739 } else { 1740 num_32++; 1741 } 1742 } 1743 } 1744 return mirror::Class::ComputeClassSize(false, 0, num_32, num_64, num_ref); 1745} 1746 1747OatFile::OatClass ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1748 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1749 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1750 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1751 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1752 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1753 &dex_location_checksum); 1754 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1755 return oat_dex_file->GetOatClass(class_def_idx); 1756} 1757 1758static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1759 uint32_t method_idx) { 1760 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1761 const byte* class_data = dex_file.GetClassData(class_def); 1762 CHECK(class_data != NULL); 1763 ClassDataItemIterator it(dex_file, class_data); 1764 // Skip fields 1765 while (it.HasNextStaticField()) { 1766 it.Next(); 1767 } 1768 while (it.HasNextInstanceField()) { 1769 it.Next(); 1770 } 1771 // Process methods 1772 size_t class_def_method_index = 0; 1773 while (it.HasNextDirectMethod()) { 1774 if (it.GetMemberIndex() == method_idx) { 1775 return class_def_method_index; 1776 } 1777 class_def_method_index++; 1778 it.Next(); 1779 } 1780 while (it.HasNextVirtualMethod()) { 1781 if (it.GetMemberIndex() == method_idx) { 1782 return class_def_method_index; 1783 } 1784 class_def_method_index++; 1785 it.Next(); 1786 } 1787 DCHECK(!it.HasNext()); 1788 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1789 return 0; 1790} 1791 1792const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1793 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1794 // method for direct methods (or virtual methods made direct). 1795 mirror::Class* declaring_class = method->GetDeclaringClass(); 1796 size_t oat_method_index; 1797 if (method->IsStatic() || method->IsDirect()) { 1798 // Simple case where the oat method index was stashed at load time. 1799 oat_method_index = method->GetMethodIndex(); 1800 } else { 1801 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1802 // by search for its position in the declared virtual methods. 1803 oat_method_index = declaring_class->NumDirectMethods(); 1804 size_t end = declaring_class->NumVirtualMethods(); 1805 bool found = false; 1806 for (size_t i = 0; i < end; i++) { 1807 if (declaring_class->GetVirtualMethod(i) == method) { 1808 found = true; 1809 break; 1810 } 1811 oat_method_index++; 1812 } 1813 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1814 } 1815 DCHECK_EQ(oat_method_index, 1816 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1817 method->GetDeclaringClass()->GetDexClassDefIndex(), 1818 method->GetDexMethodIndex())); 1819 const OatFile::OatClass oat_class = GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1820 declaring_class->GetDexClassDefIndex()); 1821 1822 return oat_class.GetOatMethod(oat_method_index); 1823} 1824 1825// Special case to get oat code without overwriting a trampoline. 1826const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1827 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1828 if (method->IsProxyMethod()) { 1829 return GetQuickProxyInvokeHandler(); 1830 } 1831 const void* result = GetOatMethodFor(method).GetQuickCode(); 1832 if (result == nullptr) { 1833 if (method->IsNative()) { 1834 // No code and native? Use generic trampoline. 1835 result = GetQuickGenericJniTrampoline(); 1836 } else if (method->IsPortableCompiled()) { 1837 // No code? Do we expect portable code? 1838 result = GetQuickToPortableBridge(); 1839 } else { 1840 // No code? You must mean to go into the interpreter. 1841 result = GetQuickToInterpreterBridge(); 1842 } 1843 } 1844 return result; 1845} 1846 1847const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1848 bool* have_portable_code) { 1849 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1850 *have_portable_code = false; 1851 if (method->IsProxyMethod()) { 1852 return GetPortableProxyInvokeHandler(); 1853 } 1854 const OatFile::OatMethod oat_method = GetOatMethodFor(method); 1855 const void* result = oat_method.GetPortableCode(); 1856 if (result == nullptr) { 1857 if (oat_method.GetQuickCode() == nullptr) { 1858 // No code? You must mean to go into the interpreter. 1859 result = GetPortableToInterpreterBridge(); 1860 } else { 1861 // No code? But there's quick code, so use a bridge. 1862 result = GetPortableToQuickBridge(); 1863 } 1864 } else { 1865 *have_portable_code = true; 1866 } 1867 return result; 1868} 1869 1870const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1871 uint32_t method_idx) { 1872 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1873 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1874 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 1875} 1876 1877const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1878 uint32_t method_idx) { 1879 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1880 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1881 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 1882} 1883 1884// Returns true if the method must run with interpreter, false otherwise. 1885static bool NeedsInterpreter( 1886 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 1887 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1888 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1889 // No code: need interpreter. 1890 // May return true for native code, in the case of generic JNI 1891 // DCHECK(!method->IsNative()); 1892 return true; 1893 } 1894#ifdef ART_SEA_IR_MODE 1895 ScopedObjectAccess soa(Thread::Current()); 1896 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1897 LOG(INFO) << "Found " << PrettyMethod(method); 1898 return false; 1899 } 1900#endif 1901 // If interpreter mode is enabled, every method (except native and proxy) must 1902 // be run with interpreter. 1903 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1904 !method->IsNative() && !method->IsProxyMethod(); 1905} 1906 1907void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1908 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1909 if (klass->NumDirectMethods() == 0) { 1910 return; // No direct methods => no static methods. 1911 } 1912 Runtime* runtime = Runtime::Current(); 1913 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1914 return; // OAT file unavailable. 1915 } 1916 const DexFile& dex_file = klass->GetDexFile(); 1917 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 1918 CHECK(dex_class_def != nullptr); 1919 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1920 // There should always be class data if there were direct methods. 1921 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1922 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 1923 ClassDataItemIterator it(dex_file, class_data); 1924 // Skip fields 1925 while (it.HasNextStaticField()) { 1926 it.Next(); 1927 } 1928 while (it.HasNextInstanceField()) { 1929 it.Next(); 1930 } 1931 // Link the code of methods skipped by LinkCode. 1932 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1933 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1934 if (!method->IsStatic()) { 1935 // Only update static methods. 1936 continue; 1937 } 1938 const void* portable_code = oat_class.GetOatMethod(method_index).GetPortableCode(); 1939 const void* quick_code = oat_class.GetOatMethod(method_index).GetQuickCode(); 1940 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1941 bool have_portable_code = false; 1942 if (enter_interpreter) { 1943 // Use interpreter entry point. 1944 // Check whether the method is native, in which case it's generic JNI. 1945 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 1946 quick_code = GetQuickGenericJniTrampoline(); 1947 portable_code = GetPortableToQuickBridge(); 1948 } else { 1949 portable_code = GetPortableToInterpreterBridge(); 1950 quick_code = GetQuickToInterpreterBridge(); 1951 } 1952 } else { 1953 if (portable_code == nullptr) { 1954 portable_code = GetPortableToQuickBridge(); 1955 } else { 1956 have_portable_code = true; 1957 } 1958 if (quick_code == nullptr) { 1959 quick_code = GetQuickToPortableBridge(); 1960 } 1961 } 1962 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1963 have_portable_code); 1964 } 1965 // Ignore virtual methods on the iterator. 1966} 1967 1968void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 1969 const DexFile& dex_file, uint32_t dex_method_index, 1970 uint32_t method_index) { 1971 // Method shouldn't have already been linked. 1972 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1973 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1974 // Every kind of method should at least get an invoke stub from the oat_method. 1975 // non-abstract methods also get their code pointers. 1976 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1977 oat_method.LinkMethod(method.Get()); 1978 1979 // Install entry point from interpreter. 1980 Runtime* runtime = Runtime::Current(); 1981 bool enter_interpreter = NeedsInterpreter(method.Get(), 1982 method->GetEntryPointFromQuickCompiledCode(), 1983 method->GetEntryPointFromPortableCompiledCode()); 1984 if (enter_interpreter && !method->IsNative()) { 1985 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1986 } else { 1987 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1988 } 1989 1990 if (method->IsAbstract()) { 1991 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1992 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1993 return; 1994 } 1995 1996 bool have_portable_code = false; 1997 if (method->IsStatic() && !method->IsConstructor()) { 1998 // For static methods excluding the class initializer, install the trampoline. 1999 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2000 // after initializing class (see ClassLinker::InitializeClass method). 2001 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2002 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2003 } else if (enter_interpreter) { 2004 if (!method->IsNative()) { 2005 // Set entry point from compiled code if there's no code or in interpreter only mode. 2006 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2007 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2008 } else { 2009 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2010 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2011 } 2012 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2013 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2014 have_portable_code = true; 2015 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2016 } else { 2017 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2018 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2019 } 2020 2021 if (method->IsNative()) { 2022 // Unregistering restores the dlsym lookup stub. 2023 method->UnregisterNative(Thread::Current()); 2024 2025 if (enter_interpreter) { 2026 // We have a native method here without code. Then it should have either the GenericJni 2027 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2028 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2029 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2030 } 2031 } 2032 2033 // Allow instrumentation its chance to hijack code. 2034 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2035 method->GetEntryPointFromQuickCompiledCode(), 2036 method->GetEntryPointFromPortableCompiledCode(), 2037 have_portable_code); 2038} 2039 2040void ClassLinker::LoadClass(const DexFile& dex_file, 2041 const DexFile::ClassDef& dex_class_def, 2042 Handle<mirror::Class> klass, 2043 mirror::ClassLoader* class_loader) { 2044 CHECK(klass.Get() != NULL); 2045 CHECK(klass->GetDexCache() != NULL); 2046 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2047 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2048 CHECK(descriptor != NULL); 2049 2050 klass->SetClass(GetClassRoot(kJavaLangClass)); 2051 if (kUseBakerOrBrooksReadBarrier) { 2052 klass->AssertReadBarrierPointer(); 2053 } 2054 uint32_t access_flags = dex_class_def.access_flags_; 2055 // Make sure that none of our runtime-only flags are set. 2056 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2057 klass->SetAccessFlags(access_flags); 2058 klass->SetClassLoader(class_loader); 2059 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2060 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2061 2062 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2063 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2064 2065 const byte* class_data = dex_file.GetClassData(dex_class_def); 2066 if (class_data == NULL) { 2067 return; // no fields or methods - for example a marker interface 2068 } 2069 2070 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2071 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 2072 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2073 } else { 2074 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2075 } 2076} 2077 2078void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2079 const byte* class_data, 2080 Handle<mirror::Class> klass, 2081 mirror::ClassLoader* class_loader, 2082 const OatFile::OatClass* oat_class) { 2083 // Load fields. 2084 ClassDataItemIterator it(dex_file, class_data); 2085 Thread* self = Thread::Current(); 2086 if (it.NumStaticFields() != 0) { 2087 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2088 if (UNLIKELY(statics == NULL)) { 2089 CHECK(self->IsExceptionPending()); // OOME. 2090 return; 2091 } 2092 klass->SetSFields(statics); 2093 } 2094 if (it.NumInstanceFields() != 0) { 2095 mirror::ObjectArray<mirror::ArtField>* fields = 2096 AllocArtFieldArray(self, it.NumInstanceFields()); 2097 if (UNLIKELY(fields == NULL)) { 2098 CHECK(self->IsExceptionPending()); // OOME. 2099 return; 2100 } 2101 klass->SetIFields(fields); 2102 } 2103 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2104 StackHandleScope<1> hs(self); 2105 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2106 if (UNLIKELY(sfield.Get() == NULL)) { 2107 CHECK(self->IsExceptionPending()); // OOME. 2108 return; 2109 } 2110 klass->SetStaticField(i, sfield.Get()); 2111 LoadField(dex_file, it, klass, sfield); 2112 } 2113 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2114 StackHandleScope<1> hs(self); 2115 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2116 if (UNLIKELY(ifield.Get() == NULL)) { 2117 CHECK(self->IsExceptionPending()); // OOME. 2118 return; 2119 } 2120 klass->SetInstanceField(i, ifield.Get()); 2121 LoadField(dex_file, it, klass, ifield); 2122 } 2123 2124 // Load methods. 2125 if (it.NumDirectMethods() != 0) { 2126 // TODO: append direct methods to class object 2127 mirror::ObjectArray<mirror::ArtMethod>* directs = 2128 AllocArtMethodArray(self, it.NumDirectMethods()); 2129 if (UNLIKELY(directs == NULL)) { 2130 CHECK(self->IsExceptionPending()); // OOME. 2131 return; 2132 } 2133 klass->SetDirectMethods(directs); 2134 } 2135 if (it.NumVirtualMethods() != 0) { 2136 // TODO: append direct methods to class object 2137 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2138 AllocArtMethodArray(self, it.NumVirtualMethods()); 2139 if (UNLIKELY(virtuals == NULL)) { 2140 CHECK(self->IsExceptionPending()); // OOME. 2141 return; 2142 } 2143 klass->SetVirtualMethods(virtuals); 2144 } 2145 size_t class_def_method_index = 0; 2146 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2147 StackHandleScope<1> hs(self); 2148 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2149 if (UNLIKELY(method.Get() == NULL)) { 2150 CHECK(self->IsExceptionPending()); // OOME. 2151 return; 2152 } 2153 klass->SetDirectMethod(i, method.Get()); 2154 if (oat_class != nullptr) { 2155 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2156 } 2157 method->SetMethodIndex(class_def_method_index); 2158 class_def_method_index++; 2159 } 2160 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2161 StackHandleScope<1> hs(self); 2162 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2163 if (UNLIKELY(method.Get() == NULL)) { 2164 CHECK(self->IsExceptionPending()); // OOME. 2165 return; 2166 } 2167 klass->SetVirtualMethod(i, method.Get()); 2168 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2169 if (oat_class != nullptr) { 2170 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2171 } 2172 class_def_method_index++; 2173 } 2174 DCHECK(!it.HasNext()); 2175} 2176 2177void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2178 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2179 uint32_t field_idx = it.GetMemberIndex(); 2180 dst->SetDexFieldIndex(field_idx); 2181 dst->SetDeclaringClass(klass.Get()); 2182 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2183} 2184 2185mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2186 const ClassDataItemIterator& it, 2187 Handle<mirror::Class> klass) { 2188 uint32_t dex_method_idx = it.GetMemberIndex(); 2189 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2190 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2191 2192 mirror::ArtMethod* dst = AllocArtMethod(self); 2193 if (UNLIKELY(dst == NULL)) { 2194 CHECK(self->IsExceptionPending()); // OOME. 2195 return NULL; 2196 } 2197 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2198 2199 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2200 dst->SetDexMethodIndex(dex_method_idx); 2201 dst->SetDeclaringClass(klass.Get()); 2202 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2203 2204 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2205 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2206 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2207 2208 uint32_t access_flags = it.GetMemberAccessFlags(); 2209 2210 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2211 // Set finalizable flag on declaring class. 2212 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2213 // Void return type. 2214 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 2215 klass->SetFinalizable(); 2216 } else { 2217 std::string klass_descriptor = klass->GetDescriptor(); 2218 // The Enum class declares a "final" finalize() method to prevent subclasses from 2219 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2220 // subclasses, so we exclude it here. 2221 // We also want to avoid setting the flag on Object, where we know that finalize() is 2222 // empty. 2223 if (klass_descriptor.compare("Ljava/lang/Object;") != 0 && 2224 klass_descriptor.compare("Ljava/lang/Enum;") != 0) { 2225 klass->SetFinalizable(); 2226 } 2227 } 2228 } 2229 } else if (method_name[0] == '<') { 2230 // Fix broken access flags for initializers. Bug 11157540. 2231 bool is_init = (strcmp("<init>", method_name) == 0); 2232 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2233 if (UNLIKELY(!is_init && !is_clinit)) { 2234 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2235 } else { 2236 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2237 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2238 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2239 access_flags |= kAccConstructor; 2240 } 2241 } 2242 } 2243 dst->SetAccessFlags(access_flags); 2244 2245 self->EndAssertNoThreadSuspension(old_cause); 2246 return dst; 2247} 2248 2249void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2250 Thread* self = Thread::Current(); 2251 StackHandleScope<1> hs(self); 2252 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2253 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2254 AppendToBootClassPath(dex_file, dex_cache); 2255} 2256 2257void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2258 Handle<mirror::DexCache> dex_cache) { 2259 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2260 boot_class_path_.push_back(&dex_file); 2261 RegisterDexFile(dex_file, dex_cache); 2262} 2263 2264bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2265 dex_lock_.AssertSharedHeld(Thread::Current()); 2266 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2267 mirror::DexCache* dex_cache = GetDexCache(i); 2268 if (dex_cache->GetDexFile() == &dex_file) { 2269 return true; 2270 } 2271 } 2272 return false; 2273} 2274 2275bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2276 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2277 return IsDexFileRegisteredLocked(dex_file); 2278} 2279 2280void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2281 Handle<mirror::DexCache> dex_cache) { 2282 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2283 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2284 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2285 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2286 dex_caches_.push_back(dex_cache.Get()); 2287 dex_cache->SetDexFile(&dex_file); 2288 if (log_new_dex_caches_roots_) { 2289 // TODO: This is not safe if we can remove dex caches. 2290 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2291 } 2292} 2293 2294void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2295 Thread* self = Thread::Current(); 2296 { 2297 ReaderMutexLock mu(self, dex_lock_); 2298 if (IsDexFileRegisteredLocked(dex_file)) { 2299 return; 2300 } 2301 } 2302 // Don't alloc while holding the lock, since allocation may need to 2303 // suspend all threads and another thread may need the dex_lock_ to 2304 // get to a suspend point. 2305 StackHandleScope<1> hs(self); 2306 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2307 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2308 { 2309 WriterMutexLock mu(self, dex_lock_); 2310 if (IsDexFileRegisteredLocked(dex_file)) { 2311 return; 2312 } 2313 RegisterDexFileLocked(dex_file, dex_cache); 2314 } 2315} 2316 2317void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2318 Handle<mirror::DexCache> dex_cache) { 2319 WriterMutexLock mu(Thread::Current(), dex_lock_); 2320 RegisterDexFileLocked(dex_file, dex_cache); 2321} 2322 2323mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2324 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2325 // Search assuming unique-ness of dex file. 2326 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2327 mirror::DexCache* dex_cache = GetDexCache(i); 2328 if (dex_cache->GetDexFile() == &dex_file) { 2329 return dex_cache; 2330 } 2331 } 2332 // Search matching by location name. 2333 std::string location(dex_file.GetLocation()); 2334 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2335 mirror::DexCache* dex_cache = GetDexCache(i); 2336 if (dex_cache->GetDexFile()->GetLocation() == location) { 2337 return dex_cache; 2338 } 2339 } 2340 // Failure, dump diagnostic and abort. 2341 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2342 mirror::DexCache* dex_cache = GetDexCache(i); 2343 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2344 } 2345 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2346 return NULL; 2347} 2348 2349void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2350 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2351 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2352 mirror::DexCache* dex_cache = GetDexCache(i); 2353 dex_cache->Fixup(resolution_method); 2354 } 2355} 2356 2357mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2358 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 2359 if (UNLIKELY(klass == NULL)) { 2360 return NULL; 2361 } 2362 return InitializePrimitiveClass(klass, type); 2363} 2364 2365mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2366 Primitive::Type type) { 2367 CHECK(primitive_class != NULL); 2368 // Must hold lock on object when initializing. 2369 Thread* self = Thread::Current(); 2370 StackHandleScope<1> hs(self); 2371 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2372 ObjectLock<mirror::Class> lock(self, h_class); 2373 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2374 primitive_class->SetPrimitiveType(type); 2375 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2376 const char* descriptor = Primitive::Descriptor(type); 2377 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2378 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2379 return primitive_class; 2380} 2381 2382// Create an array class (i.e. the class object for the array, not the 2383// array itself). "descriptor" looks like "[C" or "[[[[B" or 2384// "[Ljava/lang/String;". 2385// 2386// If "descriptor" refers to an array of primitives, look up the 2387// primitive type's internally-generated class object. 2388// 2389// "class_loader" is the class loader of the class that's referring to 2390// us. It's used to ensure that we're looking for the element type in 2391// the right context. It does NOT become the class loader for the 2392// array class; that always comes from the base element class. 2393// 2394// Returns NULL with an exception raised on failure. 2395mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2396 Handle<mirror::ClassLoader> class_loader) { 2397 // Identify the underlying component type 2398 CHECK_EQ('[', descriptor[0]); 2399 StackHandleScope<2> hs(self); 2400 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2401 if (component_type.Get() == nullptr) { 2402 DCHECK(self->IsExceptionPending()); 2403 return nullptr; 2404 } 2405 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2406 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2407 return nullptr; 2408 } 2409 // See if the component type is already loaded. Array classes are 2410 // always associated with the class loader of their underlying 2411 // element type -- an array of Strings goes with the loader for 2412 // java/lang/String -- so we need to look for it there. (The 2413 // caller should have checked for the existence of the class 2414 // before calling here, but they did so with *their* class loader, 2415 // not the component type's loader.) 2416 // 2417 // If we find it, the caller adds "loader" to the class' initiating 2418 // loader list, which should prevent us from going through this again. 2419 // 2420 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2421 // are the same, because our caller (FindClass) just did the 2422 // lookup. (Even if we get this wrong we still have correct behavior, 2423 // because we effectively do this lookup again when we add the new 2424 // class to the hash table --- necessary because of possible races with 2425 // other threads.) 2426 if (class_loader.Get() != component_type->GetClassLoader()) { 2427 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2428 if (new_class != NULL) { 2429 return new_class; 2430 } 2431 } 2432 2433 // Fill out the fields in the Class. 2434 // 2435 // It is possible to execute some methods against arrays, because 2436 // all arrays are subclasses of java_lang_Object_, so we need to set 2437 // up a vtable. We can just point at the one in java_lang_Object_. 2438 // 2439 // Array classes are simple enough that we don't need to do a full 2440 // link step. 2441 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2442 if (UNLIKELY(!init_done_)) { 2443 // Classes that were hand created, ie not by FindSystemClass 2444 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2445 new_class.Assign(GetClassRoot(kClassArrayClass)); 2446 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2447 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2448 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2449 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2450 } else if (strcmp(descriptor, 2451 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2452 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2453 } else if (strcmp(descriptor, 2454 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2455 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2456 } else if (strcmp(descriptor, "[C") == 0) { 2457 new_class.Assign(GetClassRoot(kCharArrayClass)); 2458 } else if (strcmp(descriptor, "[I") == 0) { 2459 new_class.Assign(GetClassRoot(kIntArrayClass)); 2460 } 2461 } 2462 if (new_class.Get() == nullptr) { 2463 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 2464 if (new_class.Get() == nullptr) { 2465 return nullptr; 2466 } 2467 new_class->SetComponentType(component_type.Get()); 2468 } 2469 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2470 DCHECK(new_class->GetComponentType() != NULL); 2471 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2472 new_class->SetSuperClass(java_lang_Object); 2473 new_class->SetVTable(java_lang_Object->GetVTable()); 2474 new_class->SetPrimitiveType(Primitive::kPrimNot); 2475 new_class->SetClassLoader(component_type->GetClassLoader()); 2476 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 2477 new_class->PopulateEmbeddedImtAndVTable(); 2478 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2479 // don't need to set new_class->SetObjectSize(..) 2480 // because Object::SizeOf delegates to Array::SizeOf 2481 2482 2483 // All arrays have java/lang/Cloneable and java/io/Serializable as 2484 // interfaces. We need to set that up here, so that stuff like 2485 // "instanceof" works right. 2486 // 2487 // Note: The GC could run during the call to FindSystemClass, 2488 // so we need to make sure the class object is GC-valid while we're in 2489 // there. Do this by clearing the interface list so the GC will just 2490 // think that the entries are null. 2491 2492 2493 // Use the single, global copies of "interfaces" and "iftable" 2494 // (remember not to free them for arrays). 2495 { 2496 mirror::IfTable* array_iftable = 2497 ReadBarrier::BarrierForRoot<mirror::IfTable, kWithReadBarrier>(&array_iftable_); 2498 CHECK(array_iftable != nullptr); 2499 new_class->SetIfTable(array_iftable); 2500 } 2501 2502 // Inherit access flags from the component type. 2503 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2504 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2505 access_flags &= kAccJavaFlagsMask; 2506 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2507 // and remove "interface". 2508 access_flags |= kAccAbstract | kAccFinal; 2509 access_flags &= ~kAccInterface; 2510 2511 new_class->SetAccessFlags(access_flags); 2512 2513 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2514 if (existing == nullptr) { 2515 return new_class.Get(); 2516 } 2517 // Another thread must have loaded the class after we 2518 // started but before we finished. Abandon what we've 2519 // done. 2520 // 2521 // (Yes, this happens.) 2522 2523 return existing; 2524} 2525 2526mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2527 switch (type) { 2528 case 'B': 2529 return GetClassRoot(kPrimitiveByte); 2530 case 'C': 2531 return GetClassRoot(kPrimitiveChar); 2532 case 'D': 2533 return GetClassRoot(kPrimitiveDouble); 2534 case 'F': 2535 return GetClassRoot(kPrimitiveFloat); 2536 case 'I': 2537 return GetClassRoot(kPrimitiveInt); 2538 case 'J': 2539 return GetClassRoot(kPrimitiveLong); 2540 case 'S': 2541 return GetClassRoot(kPrimitiveShort); 2542 case 'Z': 2543 return GetClassRoot(kPrimitiveBoolean); 2544 case 'V': 2545 return GetClassRoot(kPrimitiveVoid); 2546 default: 2547 break; 2548 } 2549 std::string printable_type(PrintableChar(type)); 2550 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2551 return NULL; 2552} 2553 2554mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2555 size_t hash) { 2556 if (VLOG_IS_ON(class_linker)) { 2557 mirror::DexCache* dex_cache = klass->GetDexCache(); 2558 std::string source; 2559 if (dex_cache != NULL) { 2560 source += " from "; 2561 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2562 } 2563 LOG(INFO) << "Loaded class " << descriptor << source; 2564 } 2565 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2566 mirror::Class* existing = 2567 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2568 if (existing != NULL) { 2569 return existing; 2570 } 2571 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == NULL && 2572 dex_cache_image_class_lookup_required_) { 2573 // Check a class loaded with the system class loader matches one in the image if the class 2574 // is in the image. 2575 existing = LookupClassFromImage(descriptor); 2576 if (existing != NULL) { 2577 CHECK(klass == existing); 2578 } 2579 } 2580 VerifyObject(klass); 2581 class_table_.insert(std::make_pair(hash, klass)); 2582 if (log_new_class_table_roots_) { 2583 new_class_roots_.push_back(std::make_pair(hash, klass)); 2584 } 2585 return NULL; 2586} 2587 2588mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 2589 size_t hash) { 2590 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2591 mirror::Class* existing = 2592 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2593 2594 if (existing == nullptr) { 2595 CHECK(klass->IsProxyClass()); 2596 return nullptr; 2597 } 2598 2599 CHECK_NE(existing, klass) << descriptor; 2600 CHECK(!existing->IsResolved()) << descriptor; 2601 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 2602 2603 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2604 ++it) { 2605 mirror::Class** root = &it->second; 2606 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2607 if (klass == existing) { 2608 class_table_.erase(it); 2609 break; 2610 } 2611 } 2612 2613 CHECK(!klass->IsTemp()) << descriptor; 2614 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 2615 dex_cache_image_class_lookup_required_) { 2616 // Check a class loaded with the system class loader matches one in the image if the class 2617 // is in the image. 2618 existing = LookupClassFromImage(descriptor); 2619 if (existing != nullptr) { 2620 CHECK(klass == existing) << descriptor; 2621 } 2622 } 2623 VerifyObject(klass); 2624 2625 class_table_.insert(std::make_pair(hash, klass)); 2626 if (log_new_class_table_roots_) { 2627 new_class_roots_.push_back(std::make_pair(hash, klass)); 2628 } 2629 2630 return existing; 2631} 2632 2633bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2634 size_t hash = Hash(descriptor); 2635 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2636 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2637 it != end && it->first == hash; 2638 ++it) { 2639 mirror::Class** root = &it->second; 2640 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2641 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2642 class_table_.erase(it); 2643 return true; 2644 } 2645 } 2646 return false; 2647} 2648 2649mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2650 const mirror::ClassLoader* class_loader) { 2651 size_t hash = Hash(descriptor); 2652 { 2653 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2654 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2655 if (result != NULL) { 2656 return result; 2657 } 2658 } 2659 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2660 return NULL; 2661 } else { 2662 // Lookup failed but need to search dex_caches_. 2663 mirror::Class* result = LookupClassFromImage(descriptor); 2664 if (result != NULL) { 2665 InsertClass(descriptor, result, hash); 2666 } else { 2667 // Searching the image dex files/caches failed, we don't want to get into this situation 2668 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2669 // classes into the class table. 2670 const int32_t kMaxFailedDexCacheLookups = 1000; 2671 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2672 MoveImageClassesToClassTable(); 2673 } 2674 } 2675 return result; 2676 } 2677} 2678 2679mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2680 const mirror::ClassLoader* class_loader, 2681 size_t hash) { 2682 auto end = class_table_.end(); 2683 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2684 mirror::Class** root = &it->second; 2685 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2686 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2687 if (kIsDebugBuild) { 2688 // Check for duplicates in the table. 2689 for (++it; it != end && it->first == hash; ++it) { 2690 mirror::Class** root2 = &it->second; 2691 mirror::Class* klass2 = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root2); 2692 CHECK(!(klass2->GetClassLoader() == class_loader && 2693 klass2->DescriptorEquals(descriptor))) 2694 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2695 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2696 } 2697 } 2698 return klass; 2699 } 2700 } 2701 return NULL; 2702} 2703 2704static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2705 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2706 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2707 CHECK(image != NULL); 2708 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2709 return root->AsObjectArray<mirror::DexCache>(); 2710} 2711 2712void ClassLinker::MoveImageClassesToClassTable() { 2713 Thread* self = Thread::Current(); 2714 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2715 if (!dex_cache_image_class_lookup_required_) { 2716 return; // All dex cache classes are already in the class table. 2717 } 2718 const char* old_no_suspend_cause = 2719 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2720 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2721 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2722 mirror::DexCache* dex_cache = dex_caches->Get(i); 2723 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2724 for (int32_t j = 0; j < types->GetLength(); j++) { 2725 mirror::Class* klass = types->Get(j); 2726 if (klass != NULL) { 2727 DCHECK(klass->GetClassLoader() == NULL); 2728 std::string descriptor = klass->GetDescriptor(); 2729 size_t hash = Hash(descriptor.c_str()); 2730 mirror::Class* existing = LookupClassFromTableLocked(descriptor.c_str(), NULL, hash); 2731 if (existing != NULL) { 2732 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2733 << PrettyClassAndClassLoader(klass); 2734 } else { 2735 class_table_.insert(std::make_pair(hash, klass)); 2736 if (log_new_class_table_roots_) { 2737 new_class_roots_.push_back(std::make_pair(hash, klass)); 2738 } 2739 } 2740 } 2741 } 2742 } 2743 dex_cache_image_class_lookup_required_ = false; 2744 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2745} 2746 2747mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2748 Thread* self = Thread::Current(); 2749 const char* old_no_suspend_cause = 2750 self->StartAssertNoThreadSuspension("Image class lookup"); 2751 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2752 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2753 mirror::DexCache* dex_cache = dex_caches->Get(i); 2754 const DexFile* dex_file = dex_cache->GetDexFile(); 2755 // Try binary searching the string/type index. 2756 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2757 if (string_id != NULL) { 2758 const DexFile::TypeId* type_id = 2759 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2760 if (type_id != NULL) { 2761 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2762 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2763 if (klass != NULL) { 2764 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2765 return klass; 2766 } 2767 } 2768 } 2769 } 2770 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2771 return NULL; 2772} 2773 2774void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2775 result.clear(); 2776 if (dex_cache_image_class_lookup_required_) { 2777 MoveImageClassesToClassTable(); 2778 } 2779 size_t hash = Hash(descriptor); 2780 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2781 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2782 it != end && it->first == hash; ++it) { 2783 mirror::Class** root = &it->second; 2784 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2785 if (klass->DescriptorEquals(descriptor)) { 2786 result.push_back(klass); 2787 } 2788 } 2789} 2790 2791void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 2792 // TODO: assert that the monitor on the Class is held 2793 Thread* self = Thread::Current(); 2794 ObjectLock<mirror::Class> lock(self, klass); 2795 2796 // Don't attempt to re-verify if already sufficiently verified. 2797 if (klass->IsVerified() || 2798 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2799 return; 2800 } 2801 2802 // The class might already be erroneous, for example at compile time if we attempted to verify 2803 // this class as a parent to another. 2804 if (klass->IsErroneous()) { 2805 ThrowEarlierClassFailure(klass.Get()); 2806 return; 2807 } 2808 2809 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2810 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2811 } else { 2812 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2813 << PrettyClass(klass.Get()); 2814 CHECK(!Runtime::Current()->IsCompiler()); 2815 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2816 } 2817 2818 // Skip verification if disabled. 2819 if (!Runtime::Current()->IsVerificationEnabled()) { 2820 klass->SetStatus(mirror::Class::kStatusVerified, self); 2821 return; 2822 } 2823 2824 // Verify super class. 2825 StackHandleScope<2> hs(self); 2826 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 2827 if (super.Get() != NULL) { 2828 // Acquire lock to prevent races on verifying the super class. 2829 ObjectLock<mirror::Class> lock(self, super); 2830 2831 if (!super->IsVerified() && !super->IsErroneous()) { 2832 VerifyClass(super); 2833 } 2834 if (!super->IsCompileTimeVerified()) { 2835 std::string error_msg( 2836 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2837 PrettyDescriptor(klass.Get()).c_str(), 2838 PrettyDescriptor(super.Get()).c_str())); 2839 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2840 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 2841 if (cause.Get() != nullptr) { 2842 self->ClearException(); 2843 } 2844 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2845 if (cause.Get() != nullptr) { 2846 self->GetException(nullptr)->SetCause(cause.Get()); 2847 } 2848 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2849 if (Runtime::Current()->IsCompiler()) { 2850 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2851 } 2852 klass->SetStatus(mirror::Class::kStatusError, self); 2853 return; 2854 } 2855 } 2856 2857 // Try to use verification information from the oat file, otherwise do runtime verification. 2858 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2859 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2860 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 2861 if (oat_file_class_status == mirror::Class::kStatusError) { 2862 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2863 << PrettyDescriptor(klass.Get()) << " in " 2864 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2865 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 2866 PrettyDescriptor(klass.Get()).c_str()); 2867 klass->SetStatus(mirror::Class::kStatusError, self); 2868 return; 2869 } 2870 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2871 std::string error_msg; 2872 if (!preverified) { 2873 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 2874 Runtime::Current()->IsCompiler(), 2875 &error_msg); 2876 } 2877 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2878 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2879 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 2880 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2881 << " because: " << error_msg; 2882 } 2883 self->AssertNoPendingException(); 2884 // Make sure all classes referenced by catch blocks are resolved. 2885 ResolveClassExceptionHandlerTypes(dex_file, klass); 2886 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2887 // Even though there were no verifier failures we need to respect whether the super-class 2888 // was verified or requiring runtime reverification. 2889 if (super.Get() == NULL || super->IsVerified()) { 2890 klass->SetStatus(mirror::Class::kStatusVerified, self); 2891 } else { 2892 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2893 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2894 // Pretend a soft failure occured so that we don't consider the class verified below. 2895 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2896 } 2897 } else { 2898 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2899 // Soft failures at compile time should be retried at runtime. Soft 2900 // failures at runtime will be handled by slow paths in the generated 2901 // code. Set status accordingly. 2902 if (Runtime::Current()->IsCompiler()) { 2903 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2904 } else { 2905 klass->SetStatus(mirror::Class::kStatusVerified, self); 2906 } 2907 } 2908 } else { 2909 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 2910 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2911 << " because: " << error_msg; 2912 self->AssertNoPendingException(); 2913 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2914 klass->SetStatus(mirror::Class::kStatusError, self); 2915 } 2916 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2917 // Class is verified so we don't need to do any access check on its methods. 2918 // Let the interpreter know it by setting the kAccPreverified flag onto each 2919 // method. 2920 // Note: we're going here during compilation and at runtime. When we set the 2921 // kAccPreverified flag when compiling image classes, the flag is recorded 2922 // in the image and is set when loading the image. 2923 klass->SetPreverifiedFlagOnAllMethods(); 2924 } 2925} 2926 2927bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2928 mirror::Class::Status& oat_file_class_status) { 2929 // If we're compiling, we can only verify the class using the oat file if 2930 // we are not compiling the image or if the class we're verifying is not part of 2931 // the app. In other words, we will only check for preverification of bootclasspath 2932 // classes. 2933 if (Runtime::Current()->IsCompiler()) { 2934 // Are we compiling the bootclasspath? 2935 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2936 return false; 2937 } 2938 // We are compiling an app (not the image). 2939 2940 // Is this an app class? (I.e. not a bootclasspath class) 2941 if (klass->GetClassLoader() != NULL) { 2942 return false; 2943 } 2944 } 2945 2946 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2947 // Make this work with gtests, which do not set up the image properly. 2948 // TODO: we should clean up gtests to set up the image path properly. 2949 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2950 return false; 2951 } 2952 2953 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2954 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2955 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2956 &dex_location_checksum); 2957 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2958 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2959 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 2960 if (oat_file_class_status == mirror::Class::kStatusVerified || 2961 oat_file_class_status == mirror::Class::kStatusInitialized) { 2962 return true; 2963 } 2964 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2965 // Compile time verification failed with a soft error. Compile time verification can fail 2966 // because we have incomplete type information. Consider the following: 2967 // class ... { 2968 // Foo x; 2969 // .... () { 2970 // if (...) { 2971 // v1 gets assigned a type of resolved class Foo 2972 // } else { 2973 // v1 gets assigned a type of unresolved class Bar 2974 // } 2975 // iput x = v1 2976 // } } 2977 // when we merge v1 following the if-the-else it results in Conflict 2978 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2979 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2980 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2981 // at compile time). 2982 return false; 2983 } 2984 if (oat_file_class_status == mirror::Class::kStatusError) { 2985 // Compile time verification failed with a hard error. This is caused by invalid instructions 2986 // in the class. These errors are unrecoverable. 2987 return false; 2988 } 2989 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2990 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2991 // not loading the class. 2992 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2993 // isn't a problem and this case shouldn't occur 2994 return false; 2995 } 2996 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2997 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2998 << klass->GetDescriptor(); 2999 3000 return false; 3001} 3002 3003void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3004 Handle<mirror::Class> klass) { 3005 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3006 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3007 } 3008 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3009 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3010 } 3011} 3012 3013void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3014 mirror::ArtMethod* method) { 3015 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3016 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3017 if (code_item == NULL) { 3018 return; // native or abstract method 3019 } 3020 if (code_item->tries_size_ == 0) { 3021 return; // nothing to process 3022 } 3023 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3024 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3025 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3026 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3027 CatchHandlerIterator iterator(handlers_ptr); 3028 for (; iterator.HasNext(); iterator.Next()) { 3029 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3030 // unresolved exception types will be ignored by exception delivery 3031 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3032 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3033 if (exception_type == NULL) { 3034 DCHECK(Thread::Current()->IsExceptionPending()); 3035 Thread::Current()->ClearException(); 3036 } 3037 } 3038 } 3039 handlers_ptr = iterator.EndDataPointer(); 3040 } 3041} 3042 3043static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3044static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3045 Handle<mirror::ArtMethod> prototype); 3046 3047mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3048 jobjectArray interfaces, jobject loader, 3049 jobjectArray methods, jobjectArray throws) { 3050 Thread* self = soa.Self(); 3051 StackHandleScope<8> hs(self); 3052 Handle<mirror::Class> klass(hs.NewHandle( 3053 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3054 if (klass.Get() == NULL) { 3055 CHECK(self->IsExceptionPending()); // OOME. 3056 return NULL; 3057 } 3058 DCHECK(klass->GetClass() != NULL); 3059 klass->SetObjectSize(sizeof(mirror::Proxy)); 3060 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 3061 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3062 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3063 klass->SetName(soa.Decode<mirror::String*>(name)); 3064 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3065 klass->SetDexCache(proxy_class->GetDexCache()); 3066 klass->SetStatus(mirror::Class::kStatusIdx, self); 3067 3068 // Instance fields are inherited, but we add a couple of static fields... 3069 { 3070 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3071 if (UNLIKELY(sfields == NULL)) { 3072 CHECK(self->IsExceptionPending()); // OOME. 3073 return NULL; 3074 } 3075 klass->SetSFields(sfields); 3076 } 3077 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3078 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3079 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3080 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3081 CHECK(self->IsExceptionPending()); // OOME. 3082 return nullptr; 3083 } 3084 klass->SetStaticField(0, interfaces_sfield.Get()); 3085 interfaces_sfield->SetDexFieldIndex(0); 3086 interfaces_sfield->SetDeclaringClass(klass.Get()); 3087 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3088 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3089 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3090 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3091 CHECK(self->IsExceptionPending()); // OOME. 3092 return nullptr; 3093 } 3094 klass->SetStaticField(1, throws_sfield.Get()); 3095 throws_sfield->SetDexFieldIndex(1); 3096 throws_sfield->SetDeclaringClass(klass.Get()); 3097 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3098 3099 // Proxies have 1 direct method, the constructor 3100 { 3101 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3102 if (UNLIKELY(directs == nullptr)) { 3103 CHECK(self->IsExceptionPending()); // OOME. 3104 return nullptr; 3105 } 3106 klass->SetDirectMethods(directs); 3107 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3108 if (UNLIKELY(constructor == nullptr)) { 3109 CHECK(self->IsExceptionPending()); // OOME. 3110 return nullptr; 3111 } 3112 klass->SetDirectMethod(0, constructor); 3113 } 3114 3115 // Create virtual method using specified prototypes. 3116 size_t num_virtual_methods = 3117 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3118 { 3119 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3120 num_virtual_methods); 3121 if (UNLIKELY(virtuals == NULL)) { 3122 CHECK(self->IsExceptionPending()); // OOME. 3123 return NULL; 3124 } 3125 klass->SetVirtualMethods(virtuals); 3126 } 3127 for (size_t i = 0; i < num_virtual_methods; ++i) { 3128 StackHandleScope<1> hs(self); 3129 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3130 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3131 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3132 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3133 if (UNLIKELY(clone == nullptr)) { 3134 CHECK(self->IsExceptionPending()); // OOME. 3135 return nullptr; 3136 } 3137 klass->SetVirtualMethod(i, clone); 3138 } 3139 3140 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3141 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3142 self->AssertNoPendingException(); 3143 3144 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3145 mirror::Class* new_class = nullptr; 3146 { 3147 ObjectLock<mirror::Class> resolution_lock(self, klass); // Must hold lock on object when resolved. 3148 // Link the fields and virtual methods, creating vtable and iftables 3149 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3150 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3151 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3152 klass->SetStatus(mirror::Class::kStatusError, self); 3153 return nullptr; 3154 } 3155 } 3156 3157 CHECK(klass->IsRetired()); 3158 CHECK_NE(klass.Get(), new_class); 3159 klass.Assign(new_class); 3160 3161 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3162 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3163 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3164 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3165 3166 { 3167 // Lock on klass is released. Lock new class object. 3168 ObjectLock<mirror::Class> initialization_lock(self, klass); 3169 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3170 } 3171 3172 // sanity checks 3173 if (kIsDebugBuild) { 3174 CHECK(klass->GetIFields() == nullptr); 3175 CheckProxyConstructor(klass->GetDirectMethod(0)); 3176 for (size_t i = 0; i < num_virtual_methods; ++i) { 3177 StackHandleScope<2> hs(self); 3178 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3179 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3180 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3181 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3182 CheckProxyMethod(virtual_method, prototype); 3183 } 3184 3185 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3186 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3187 decoded_name->ToModifiedUtf8().c_str())); 3188 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3189 3190 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3191 decoded_name->ToModifiedUtf8().c_str())); 3192 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3193 3194 CHECK_EQ(klass.Get()->GetInterfaces(), 3195 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3196 CHECK_EQ(klass.Get()->GetThrows(), 3197 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3198 } 3199 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3200 CHECK(existing == nullptr); 3201 return klass.Get(); 3202} 3203 3204std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3205 DCHECK(proxy_class->IsProxyClass()); 3206 mirror::String* name = proxy_class->GetName(); 3207 DCHECK(name != NULL); 3208 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3209} 3210 3211mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3212 mirror::ArtMethod* proxy_method) { 3213 DCHECK(proxy_class->IsProxyClass()); 3214 DCHECK(proxy_method->IsProxyMethod()); 3215 // Locate the dex cache of the original interface/Object 3216 mirror::DexCache* dex_cache = NULL; 3217 { 3218 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 3219 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3220 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3221 mirror::DexCache* a_dex_cache = GetDexCache(i); 3222 if (a_dex_cache->GetResolvedTypes() == resolved_types) { 3223 dex_cache = a_dex_cache; 3224 break; 3225 } 3226 } 3227 } 3228 CHECK(dex_cache != NULL); 3229 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3230 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3231 CHECK(resolved_method != NULL); 3232 return resolved_method; 3233} 3234 3235 3236mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3237 Handle<mirror::Class> klass, 3238 mirror::Class* proxy_class) { 3239 // Create constructor for Proxy that must initialize h 3240 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3241 proxy_class->GetDirectMethods(); 3242 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3243 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3244 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3245 // code_ too) 3246 mirror::ArtMethod* constructor = 3247 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3248 if (constructor == NULL) { 3249 CHECK(self->IsExceptionPending()); // OOME. 3250 return NULL; 3251 } 3252 // Make this constructor public and fix the class to be our Proxy version 3253 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3254 constructor->SetDeclaringClass(klass.Get()); 3255 return constructor; 3256} 3257 3258static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3259 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3260 CHECK(constructor->IsConstructor()); 3261 CHECK_STREQ(constructor->GetName(), "<init>"); 3262 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3263 "(Ljava/lang/reflect/InvocationHandler;)V"); 3264 DCHECK(constructor->IsPublic()); 3265} 3266 3267mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3268 Handle<mirror::Class> klass, 3269 Handle<mirror::ArtMethod> prototype) { 3270 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3271 // prototype method 3272 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3273 prototype.Get()); 3274 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3275 // as necessary 3276 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3277 if (UNLIKELY(method == NULL)) { 3278 CHECK(self->IsExceptionPending()); // OOME. 3279 return NULL; 3280 } 3281 3282 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3283 // the intersection of throw exceptions as defined in Proxy 3284 method->SetDeclaringClass(klass.Get()); 3285 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3286 3287 // At runtime the method looks like a reference and argument saving method, clone the code 3288 // related parameters from this method. 3289 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3290 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3291 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3292 3293 return method; 3294} 3295 3296static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3297 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3298 // Basic sanity 3299 CHECK(!prototype->IsFinal()); 3300 CHECK(method->IsFinal()); 3301 CHECK(!method->IsAbstract()); 3302 3303 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3304 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3305 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3306 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 3307 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 3308 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3309 3310 MethodHelper mh(method); 3311 MethodHelper mh2(prototype); 3312 CHECK_STREQ(method->GetName(), prototype->GetName()); 3313 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3314 // More complex sanity - via dex cache 3315 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3316} 3317 3318static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3319 bool can_init_parents) 3320 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3321 if (can_init_statics && can_init_parents) { 3322 return true; 3323 } 3324 if (!can_init_statics) { 3325 // Check if there's a class initializer. 3326 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3327 if (clinit != NULL) { 3328 return false; 3329 } 3330 // Check if there are encoded static values needing initialization. 3331 if (klass->NumStaticFields() != 0) { 3332 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3333 DCHECK(dex_class_def != NULL); 3334 if (dex_class_def->static_values_off_ != 0) { 3335 return false; 3336 } 3337 } 3338 } 3339 if (!klass->IsInterface() && klass->HasSuperClass()) { 3340 mirror::Class* super_class = klass->GetSuperClass(); 3341 if (!can_init_parents && !super_class->IsInitialized()) { 3342 return false; 3343 } else { 3344 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3345 return false; 3346 } 3347 } 3348 } 3349 return true; 3350} 3351 3352bool ClassLinker::IsInitialized() const { 3353 return init_done_; 3354} 3355 3356bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3357 bool can_init_parents) { 3358 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3359 3360 // Are we already initialized and therefore done? 3361 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3362 // an initialized class will never change its state. 3363 if (klass->IsInitialized()) { 3364 return true; 3365 } 3366 3367 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3368 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3369 return false; 3370 } 3371 3372 Thread* self = Thread::Current(); 3373 uint64_t t0; 3374 { 3375 ObjectLock<mirror::Class> lock(self, klass); 3376 3377 // Re-check under the lock in case another thread initialized ahead of us. 3378 if (klass->IsInitialized()) { 3379 return true; 3380 } 3381 3382 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3383 if (klass->IsErroneous()) { 3384 ThrowEarlierClassFailure(klass.Get()); 3385 return false; 3386 } 3387 3388 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3389 3390 if (!klass->IsVerified()) { 3391 VerifyClass(klass); 3392 if (!klass->IsVerified()) { 3393 // We failed to verify, expect either the klass to be erroneous or verification failed at 3394 // compile time. 3395 if (klass->IsErroneous()) { 3396 CHECK(self->IsExceptionPending()); 3397 } else { 3398 CHECK(Runtime::Current()->IsCompiler()); 3399 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3400 } 3401 return false; 3402 } 3403 } 3404 3405 // If the class is kStatusInitializing, either this thread is 3406 // initializing higher up the stack or another thread has beat us 3407 // to initializing and we need to wait. Either way, this 3408 // invocation of InitializeClass will not be responsible for 3409 // running <clinit> and will return. 3410 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3411 // We caught somebody else in the act; was it us? 3412 if (klass->GetClinitThreadId() == self->GetTid()) { 3413 // Yes. That's fine. Return so we can continue initializing. 3414 return true; 3415 } 3416 // No. That's fine. Wait for another thread to finish initializing. 3417 return WaitForInitializeClass(klass, self, lock); 3418 } 3419 3420 if (!ValidateSuperClassDescriptors(klass)) { 3421 klass->SetStatus(mirror::Class::kStatusError, self); 3422 return false; 3423 } 3424 3425 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3426 3427 // From here out other threads may observe that we're initializing and so changes of state 3428 // require the a notification. 3429 klass->SetClinitThreadId(self->GetTid()); 3430 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3431 3432 t0 = NanoTime(); 3433 } 3434 3435 // Initialize super classes, must be done while initializing for the JLS. 3436 if (!klass->IsInterface() && klass->HasSuperClass()) { 3437 mirror::Class* super_class = klass->GetSuperClass(); 3438 if (!super_class->IsInitialized()) { 3439 CHECK(!super_class->IsInterface()); 3440 CHECK(can_init_parents); 3441 StackHandleScope<1> hs(self); 3442 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3443 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3444 if (!super_initialized) { 3445 // The super class was verified ahead of entering initializing, we should only be here if 3446 // the super class became erroneous due to initialization. 3447 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3448 << "Super class initialization failed for " 3449 << PrettyDescriptor(handle_scope_super.Get()) 3450 << " that has unexpected status " << handle_scope_super->GetStatus() 3451 << "\nPending exception:\n" 3452 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3453 ObjectLock<mirror::Class> lock(self, klass); 3454 // Initialization failed because the super-class is erroneous. 3455 klass->SetStatus(mirror::Class::kStatusError, self); 3456 return false; 3457 } 3458 } 3459 } 3460 3461 if (klass->NumStaticFields() > 0) { 3462 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3463 CHECK(dex_class_def != NULL); 3464 const DexFile& dex_file = klass->GetDexFile(); 3465 StackHandleScope<2> hs(self); 3466 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3467 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3468 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3469 this, *dex_class_def); 3470 if (it.HasNext()) { 3471 CHECK(can_init_statics); 3472 // We reordered the fields, so we need to be able to map the 3473 // field indexes to the right fields. 3474 SafeMap<uint32_t, mirror::ArtField*> field_map; 3475 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3476 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3477 if (Runtime::Current()->IsActiveTransaction()) { 3478 it.ReadValueToField<true>(field_map.Get(i)); 3479 } else { 3480 it.ReadValueToField<false>(field_map.Get(i)); 3481 } 3482 } 3483 } 3484 } 3485 3486 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3487 if (clinit != NULL) { 3488 CHECK(can_init_statics); 3489 JValue result; 3490 clinit->Invoke(self, NULL, 0, &result, "V"); 3491 } 3492 3493 uint64_t t1 = NanoTime(); 3494 3495 bool success = true; 3496 { 3497 ObjectLock<mirror::Class> lock(self, klass); 3498 3499 if (self->IsExceptionPending()) { 3500 WrapExceptionInInitializer(); 3501 klass->SetStatus(mirror::Class::kStatusError, self); 3502 success = false; 3503 } else { 3504 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3505 RuntimeStats* thread_stats = self->GetStats(); 3506 ++global_stats->class_init_count; 3507 ++thread_stats->class_init_count; 3508 global_stats->class_init_time_ns += (t1 - t0); 3509 thread_stats->class_init_time_ns += (t1 - t0); 3510 // Set the class as initialized except if failed to initialize static fields. 3511 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3512 if (VLOG_IS_ON(class_linker)) { 3513 LOG(INFO) << "Initialized class " << klass->GetDescriptor() << " from " << 3514 klass->GetLocation(); 3515 } 3516 // Opportunistically set static method trampolines to their destination. 3517 FixupStaticTrampolines(klass.Get()); 3518 } 3519 } 3520 return success; 3521} 3522 3523bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3524 ObjectLock<mirror::Class>& lock) 3525 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3526 while (true) { 3527 self->AssertNoPendingException(); 3528 CHECK(!klass->IsInitialized()); 3529 lock.WaitIgnoringInterrupts(); 3530 3531 // When we wake up, repeat the test for init-in-progress. If 3532 // there's an exception pending (only possible if 3533 // "interruptShouldThrow" was set), bail out. 3534 if (self->IsExceptionPending()) { 3535 WrapExceptionInInitializer(); 3536 klass->SetStatus(mirror::Class::kStatusError, self); 3537 return false; 3538 } 3539 // Spurious wakeup? Go back to waiting. 3540 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3541 continue; 3542 } 3543 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3544 // Compile time initialization failed. 3545 return false; 3546 } 3547 if (klass->IsErroneous()) { 3548 // The caller wants an exception, but it was thrown in a 3549 // different thread. Synthesize one here. 3550 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3551 PrettyDescriptor(klass.Get()).c_str()); 3552 return false; 3553 } 3554 if (klass->IsInitialized()) { 3555 return true; 3556 } 3557 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 3558 << klass->GetStatus(); 3559 } 3560 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 3561} 3562 3563bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 3564 if (klass->IsInterface()) { 3565 return true; 3566 } 3567 // Begin with the methods local to the superclass. 3568 StackHandleScope<2> hs(Thread::Current()); 3569 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3570 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3571 if (klass->HasSuperClass() && 3572 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3573 for (int i = klass->GetSuperClass()->GetVTable()->GetLength() - 1; i >= 0; --i) { 3574 mh.ChangeMethod(klass->GetVTable()->GetWithoutChecks(i)); 3575 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTable()->GetWithoutChecks(i)); 3576 if (mh.GetMethod() != super_mh.GetMethod() && 3577 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3578 ThrowLinkageError(klass.Get(), 3579 "Class %s method %s resolves differently in superclass %s", 3580 PrettyDescriptor(klass.Get()).c_str(), 3581 PrettyMethod(mh.GetMethod()).c_str(), 3582 PrettyDescriptor(klass->GetSuperClass()).c_str()); 3583 return false; 3584 } 3585 } 3586 } 3587 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3588 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 3589 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 3590 for (uint32_t j = 0; j < num_methods; ++j) { 3591 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 3592 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 3593 if (mh.GetMethod() != super_mh.GetMethod() && 3594 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3595 ThrowLinkageError(klass.Get(), 3596 "Class %s method %s resolves differently in interface %s", 3597 PrettyDescriptor(klass.Get()).c_str(), 3598 PrettyMethod(mh.GetMethod()).c_str(), 3599 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 3600 return false; 3601 } 3602 } 3603 } 3604 } 3605 return true; 3606} 3607 3608bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 3609 bool can_init_parents) { 3610 DCHECK(c.Get() != nullptr); 3611 const bool success = c->IsInitialized() || InitializeClass(c, can_init_fields, can_init_parents); 3612 if (!success && can_init_fields && can_init_parents) { 3613 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.Get()); 3614 } 3615 return success; 3616} 3617 3618void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3619 mirror::Class* c, 3620 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3621 const byte* class_data = dex_file.GetClassData(dex_class_def); 3622 ClassDataItemIterator it(dex_file, class_data); 3623 StackHandleScope<2> hs(Thread::Current()); 3624 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 3625 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 3626 CHECK(!kMovingFields); 3627 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3628 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3629 } 3630} 3631 3632void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 3633 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 3634 if (fields != nullptr) { 3635 for (int index = 0; index < fields->GetLength(); index ++) { 3636 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 3637 fields->Get(index)->SetDeclaringClass(new_class); 3638 } 3639 } 3640 } 3641 3642 fields = new_class->GetSFields(); 3643 if (fields != nullptr) { 3644 for (int index = 0; index < fields->GetLength(); index ++) { 3645 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 3646 fields->Get(index)->SetDeclaringClass(new_class); 3647 } 3648 } 3649 } 3650 3651 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 3652 if (methods != nullptr) { 3653 for (int index = 0; index < methods->GetLength(); index ++) { 3654 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 3655 methods->Get(index)->SetDeclaringClass(new_class); 3656 } 3657 } 3658 } 3659 3660 methods = new_class->GetVirtualMethods(); 3661 if (methods != nullptr) { 3662 for (int index = 0; index < methods->GetLength(); index ++) { 3663 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 3664 methods->Get(index)->SetDeclaringClass(new_class); 3665 } 3666 } 3667 } 3668} 3669 3670bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 3671 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 3672 mirror::Class** new_class) { 3673 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3674 3675 if (!LinkSuperClass(klass)) { 3676 return false; 3677 } 3678 if (!LinkMethods(self, klass, interfaces)) { 3679 return false; 3680 } 3681 if (!LinkInstanceFields(klass)) { 3682 return false; 3683 } 3684 size_t class_size; 3685 if (!LinkStaticFields(klass, &class_size)) { 3686 return false; 3687 } 3688 CreateReferenceInstanceOffsets(klass); 3689 CreateReferenceStaticOffsets(klass); 3690 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3691 3692 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 3693 // We don't need to retire this class as it has no embedded tables or it was created the 3694 // correct size during class linker initialization. 3695 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 3696 3697 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 3698 klass->PopulateEmbeddedImtAndVTable(); 3699 } 3700 3701 // This will notify waiters on klass that saw the not yet resolved 3702 // class in the class_table_ during EnsureResolved. 3703 klass->SetStatus(mirror::Class::kStatusResolved, self); 3704 *new_class = klass.Get(); 3705 } else { 3706 CHECK(!klass->IsResolved()); 3707 // Retire the temporary class and create the correctly sized resolved class. 3708 *new_class = klass->CopyOf(self, class_size); 3709 if (UNLIKELY(*new_class == NULL)) { 3710 CHECK(self->IsExceptionPending()); // Expect an OOME. 3711 klass->SetStatus(mirror::Class::kStatusError, self); 3712 return false; 3713 } 3714 3715 CHECK_EQ((*new_class)->GetClassSize(), class_size); 3716 StackHandleScope<1> hs(self); 3717 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 3718 ObjectLock<mirror::Class> lock(self, new_class_h); 3719 3720 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 3721 3722 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 3723 CHECK(existing == NULL || existing == klass.Get()); 3724 3725 // This will notify waiters on temp class that saw the not yet resolved class in the 3726 // class_table_ during EnsureResolved. 3727 klass->SetStatus(mirror::Class::kStatusRetired, self); 3728 3729 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 3730 // This will notify waiters on new_class that saw the not yet resolved 3731 // class in the class_table_ during EnsureResolved. 3732 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 3733 3734 // Only embedded imt should be used from this point. 3735 new_class_h->SetImTable(NULL); 3736 // TODO: remove vtable and only use embedded vtable. 3737 } 3738 return true; 3739} 3740 3741bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 3742 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3743 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3744 uint16_t super_class_idx = class_def.superclass_idx_; 3745 if (super_class_idx != DexFile::kDexNoIndex16) { 3746 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 3747 if (super_class == NULL) { 3748 DCHECK(Thread::Current()->IsExceptionPending()); 3749 return false; 3750 } 3751 // Verify 3752 if (!klass->CanAccess(super_class)) { 3753 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 3754 PrettyDescriptor(super_class).c_str(), 3755 PrettyDescriptor(klass.Get()).c_str()); 3756 return false; 3757 } 3758 CHECK(super_class->IsResolved()); 3759 klass->SetSuperClass(super_class); 3760 } 3761 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3762 if (interfaces != NULL) { 3763 for (size_t i = 0; i < interfaces->Size(); i++) { 3764 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3765 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 3766 if (interface == NULL) { 3767 DCHECK(Thread::Current()->IsExceptionPending()); 3768 return false; 3769 } 3770 // Verify 3771 if (!klass->CanAccess(interface)) { 3772 // TODO: the RI seemed to ignore this in my testing. 3773 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 3774 PrettyDescriptor(interface).c_str(), 3775 PrettyDescriptor(klass.Get()).c_str()); 3776 return false; 3777 } 3778 } 3779 } 3780 // Mark the class as loaded. 3781 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3782 return true; 3783} 3784 3785bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 3786 CHECK(!klass->IsPrimitive()); 3787 mirror::Class* super = klass->GetSuperClass(); 3788 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 3789 if (super != NULL) { 3790 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 3791 return false; 3792 } 3793 return true; 3794 } 3795 if (super == NULL) { 3796 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 3797 PrettyDescriptor(klass.Get()).c_str()); 3798 return false; 3799 } 3800 // Verify 3801 if (super->IsFinal() || super->IsInterface()) { 3802 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 3803 PrettyDescriptor(super).c_str(), 3804 PrettyDescriptor(klass.Get()).c_str(), 3805 super->IsFinal() ? "declared final" : "an interface"); 3806 return false; 3807 } 3808 if (!klass->CanAccess(super)) { 3809 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 3810 PrettyDescriptor(super).c_str(), 3811 PrettyDescriptor(klass.Get()).c_str()); 3812 return false; 3813 } 3814 3815 // Inherit kAccClassIsFinalizable from the superclass in case this 3816 // class doesn't override finalize. 3817 if (super->IsFinalizable()) { 3818 klass->SetFinalizable(); 3819 } 3820 3821 // Inherit reference flags (if any) from the superclass. 3822 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3823 if (reference_flags != 0) { 3824 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3825 } 3826 // Disallow custom direct subclasses of java.lang.ref.Reference. 3827 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3828 ThrowLinkageError(klass.Get(), 3829 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3830 PrettyDescriptor(klass.Get()).c_str()); 3831 return false; 3832 } 3833 3834 if (kIsDebugBuild) { 3835 // Ensure super classes are fully resolved prior to resolving fields.. 3836 while (super != NULL) { 3837 CHECK(super->IsResolved()); 3838 super = super->GetSuperClass(); 3839 } 3840 } 3841 return true; 3842} 3843 3844// Populate the class vtable and itable. Compute return type indices. 3845bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 3846 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3847 if (klass->IsInterface()) { 3848 // No vtable. 3849 size_t count = klass->NumVirtualMethods(); 3850 if (!IsUint(16, count)) { 3851 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 3852 return false; 3853 } 3854 for (size_t i = 0; i < count; ++i) { 3855 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3856 } 3857 // Link interface method tables 3858 return LinkInterfaceMethods(klass, interfaces); 3859 } else { 3860 // Link virtual and interface method tables 3861 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 3862 } 3863 return true; 3864} 3865 3866bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 3867 if (klass->HasSuperClass()) { 3868 uint32_t max_count = klass->NumVirtualMethods() + 3869 klass->GetSuperClass()->GetVTable()->GetLength(); 3870 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3871 CHECK_LE(actual_count, max_count); 3872 // TODO: do not assign to the vtable field until it is fully constructed. 3873 StackHandleScope<3> hs(self); 3874 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3875 hs.NewHandle(klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count))); 3876 if (UNLIKELY(vtable.Get() == NULL)) { 3877 CHECK(self->IsExceptionPending()); // OOME. 3878 return false; 3879 } 3880 // See if any of our virtual methods override the superclass. 3881 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3882 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3883 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3884 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3885 local_mh.ChangeMethod(local_method); 3886 size_t j = 0; 3887 for (; j < actual_count; ++j) { 3888 mirror::ArtMethod* super_method = vtable->Get(j); 3889 super_mh.ChangeMethod(super_method); 3890 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3891 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 3892 super_method->GetAccessFlags())) { 3893 if (super_method->IsFinal()) { 3894 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 3895 PrettyMethod(local_method).c_str(), 3896 super_method->GetDeclaringClassDescriptor()); 3897 return false; 3898 } 3899 vtable->Set<false>(j, local_method); 3900 local_method->SetMethodIndex(j); 3901 break; 3902 } else { 3903 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3904 << " would have incorrectly overridden the package-private method in " 3905 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 3906 } 3907 } 3908 } 3909 if (j == actual_count) { 3910 // Not overriding, append. 3911 vtable->Set<false>(actual_count, local_method); 3912 local_method->SetMethodIndex(actual_count); 3913 actual_count += 1; 3914 } 3915 } 3916 if (!IsUint(16, actual_count)) { 3917 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 3918 return false; 3919 } 3920 // Shrink vtable if possible 3921 CHECK_LE(actual_count, max_count); 3922 if (actual_count < max_count) { 3923 vtable.Assign(vtable->CopyOf(self, actual_count)); 3924 if (UNLIKELY(vtable.Get() == NULL)) { 3925 CHECK(self->IsExceptionPending()); // OOME. 3926 return false; 3927 } 3928 } 3929 klass->SetVTable(vtable.Get()); 3930 } else { 3931 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 3932 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3933 if (!IsUint(16, num_virtual_methods)) { 3934 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 3935 return false; 3936 } 3937 StackHandleScope<1> hs(self); 3938 Handle<mirror::ObjectArray<mirror::ArtMethod>> 3939 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 3940 if (UNLIKELY(vtable.Get() == NULL)) { 3941 CHECK(self->IsExceptionPending()); // OOME. 3942 return false; 3943 } 3944 for (size_t i = 0; i < num_virtual_methods; ++i) { 3945 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3946 vtable->Set<false>(i, virtual_method); 3947 virtual_method->SetMethodIndex(i & 0xFFFF); 3948 } 3949 klass->SetVTable(vtable.Get()); 3950 } 3951 return true; 3952} 3953 3954bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 3955 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3956 Thread* const self = Thread::Current(); 3957 Runtime* const runtime = Runtime::Current(); 3958 // Set the imt table to be all conflicts by default. 3959 klass->SetImTable(runtime->GetDefaultImt()); 3960 size_t super_ifcount; 3961 if (klass->HasSuperClass()) { 3962 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3963 } else { 3964 super_ifcount = 0; 3965 } 3966 uint32_t num_interfaces = 3967 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 3968 size_t ifcount = super_ifcount + num_interfaces; 3969 for (size_t i = 0; i < num_interfaces; i++) { 3970 mirror::Class* interface = 3971 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 3972 interfaces->Get(i); 3973 ifcount += interface->GetIfTableCount(); 3974 } 3975 if (ifcount == 0) { 3976 // Class implements no interfaces. 3977 DCHECK_EQ(klass->GetIfTableCount(), 0); 3978 DCHECK(klass->GetIfTable() == NULL); 3979 return true; 3980 } 3981 if (ifcount == super_ifcount) { 3982 // Class implements same interfaces as parent, are any of these not marker interfaces? 3983 bool has_non_marker_interface = false; 3984 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3985 for (size_t i = 0; i < ifcount; ++i) { 3986 if (super_iftable->GetMethodArrayCount(i) > 0) { 3987 has_non_marker_interface = true; 3988 break; 3989 } 3990 } 3991 if (!has_non_marker_interface) { 3992 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3993 klass->SetIfTable(super_iftable); 3994 return true; 3995 } 3996 } 3997 StackHandleScope<4> hs(self); 3998 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 3999 if (UNLIKELY(iftable.Get() == NULL)) { 4000 CHECK(self->IsExceptionPending()); // OOME. 4001 return false; 4002 } 4003 if (super_ifcount != 0) { 4004 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4005 for (size_t i = 0; i < super_ifcount; i++) { 4006 mirror::Class* super_interface = super_iftable->GetInterface(i); 4007 iftable->SetInterface(i, super_interface); 4008 } 4009 } 4010 // Flatten the interface inheritance hierarchy. 4011 size_t idx = super_ifcount; 4012 for (size_t i = 0; i < num_interfaces; i++) { 4013 mirror::Class* interface = 4014 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4015 interfaces->Get(i); 4016 DCHECK(interface != NULL); 4017 if (!interface->IsInterface()) { 4018 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4019 PrettyDescriptor(klass.Get()).c_str(), 4020 PrettyDescriptor(interface->GetDescriptor()).c_str()); 4021 return false; 4022 } 4023 // Check if interface is already in iftable 4024 bool duplicate = false; 4025 for (size_t j = 0; j < idx; j++) { 4026 mirror::Class* existing_interface = iftable->GetInterface(j); 4027 if (existing_interface == interface) { 4028 duplicate = true; 4029 break; 4030 } 4031 } 4032 if (!duplicate) { 4033 // Add this non-duplicate interface. 4034 iftable->SetInterface(idx++, interface); 4035 // Add this interface's non-duplicate super-interfaces. 4036 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4037 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4038 bool super_duplicate = false; 4039 for (size_t k = 0; k < idx; k++) { 4040 mirror::Class* existing_interface = iftable->GetInterface(k); 4041 if (existing_interface == super_interface) { 4042 super_duplicate = true; 4043 break; 4044 } 4045 } 4046 if (!super_duplicate) { 4047 iftable->SetInterface(idx++, super_interface); 4048 } 4049 } 4050 } 4051 } 4052 // Shrink iftable in case duplicates were found 4053 if (idx < ifcount) { 4054 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4055 if (UNLIKELY(iftable.Get() == NULL)) { 4056 CHECK(self->IsExceptionPending()); // OOME. 4057 return false; 4058 } 4059 ifcount = idx; 4060 } else { 4061 CHECK_EQ(idx, ifcount); 4062 } 4063 klass->SetIfTable(iftable.Get()); 4064 4065 // If we're an interface, we don't need the vtable pointers, so we're done. 4066 if (klass->IsInterface()) { 4067 return true; 4068 } 4069 // Allocate imtable 4070 bool imtable_changed = false; 4071 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4072 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4073 if (UNLIKELY(imtable.Get() == NULL)) { 4074 CHECK(self->IsExceptionPending()); // OOME. 4075 return false; 4076 } 4077 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4078 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4079 std::vector<mirror::ArtMethod*> miranda_list; 4080 for (size_t i = 0; i < ifcount; ++i) { 4081 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4082 if (num_methods > 0) { 4083 StackHandleScope<2> hs(self); 4084 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4085 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4086 if (UNLIKELY(method_array.Get() == nullptr)) { 4087 CHECK(self->IsExceptionPending()); // OOME. 4088 return false; 4089 } 4090 iftable->SetMethodArray(i, method_array.Get()); 4091 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4092 hs.NewHandle(klass->GetVTableDuringLinking())); 4093 for (size_t j = 0; j < num_methods; ++j) { 4094 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 4095 interface_mh.ChangeMethod(interface_method); 4096 int32_t k; 4097 // For each method listed in the interface's method list, find the 4098 // matching method in our class's method list. We want to favor the 4099 // subclass over the superclass, which just requires walking 4100 // back from the end of the vtable. (This only matters if the 4101 // superclass defines a private method and this class redefines 4102 // it -- otherwise it would use the same vtable slot. In .dex files 4103 // those don't end up in the virtual method table, so it shouldn't 4104 // matter which direction we go. We walk it backward anyway.) 4105 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4106 mirror::ArtMethod* vtable_method = vtable->Get(k); 4107 vtable_mh.ChangeMethod(vtable_method); 4108 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4109 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 4110 ThrowIllegalAccessError( 4111 klass.Get(), 4112 "Method '%s' implementing interface method '%s' is not public", 4113 PrettyMethod(vtable_method).c_str(), 4114 PrettyMethod(interface_method).c_str()); 4115 return false; 4116 } 4117 method_array->Set<false>(j, vtable_method); 4118 // Place method in imt if entry is empty, place conflict otherwise. 4119 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4120 if (imtable->Get(imt_index) == NULL) { 4121 imtable->Set<false>(imt_index, vtable_method); 4122 imtable_changed = true; 4123 } else { 4124 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4125 } 4126 break; 4127 } 4128 } 4129 if (k < 0) { 4130 StackHandleScope<1> hs(self); 4131 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4132 for (mirror::ArtMethod* mir_method : miranda_list) { 4133 vtable_mh.ChangeMethod(mir_method); 4134 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4135 miranda_method.Assign(mir_method); 4136 break; 4137 } 4138 } 4139 if (miranda_method.Get() == NULL) { 4140 // Point the interface table at a phantom slot. 4141 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 4142 if (UNLIKELY(miranda_method.Get() == NULL)) { 4143 CHECK(self->IsExceptionPending()); // OOME. 4144 return false; 4145 } 4146 // TODO: If a methods move then the miranda_list may hold stale references. 4147 miranda_list.push_back(miranda_method.Get()); 4148 } 4149 method_array->Set<false>(j, miranda_method.Get()); 4150 } 4151 } 4152 } 4153 } 4154 if (imtable_changed) { 4155 // Fill in empty entries in interface method table with conflict. 4156 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4157 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4158 if (imtable->Get(i) == NULL) { 4159 imtable->Set<false>(i, imt_conflict_method); 4160 } 4161 } 4162 klass->SetImTable(imtable.Get()); 4163 } 4164 if (!miranda_list.empty()) { 4165 int old_method_count = klass->NumVirtualMethods(); 4166 int new_method_count = old_method_count + miranda_list.size(); 4167 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4168 if (old_method_count == 0) { 4169 virtuals = AllocArtMethodArray(self, new_method_count); 4170 } else { 4171 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4172 } 4173 if (UNLIKELY(virtuals == NULL)) { 4174 CHECK(self->IsExceptionPending()); // OOME. 4175 return false; 4176 } 4177 klass->SetVirtualMethods(virtuals); 4178 4179 StackHandleScope<1> hs(self); 4180 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4181 hs.NewHandle(klass->GetVTableDuringLinking())); 4182 CHECK(vtable.Get() != NULL); 4183 int old_vtable_count = vtable->GetLength(); 4184 int new_vtable_count = old_vtable_count + miranda_list.size(); 4185 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4186 if (UNLIKELY(vtable.Get() == NULL)) { 4187 CHECK(self->IsExceptionPending()); // OOME. 4188 return false; 4189 } 4190 for (size_t i = 0; i < miranda_list.size(); ++i) { 4191 mirror::ArtMethod* method = miranda_list[i]; 4192 // Leave the declaring class alone as type indices are relative to it 4193 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4194 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4195 klass->SetVirtualMethod(old_method_count + i, method); 4196 vtable->Set<false>(old_vtable_count + i, method); 4197 } 4198 // TODO: do not assign to the vtable field until it is fully constructed. 4199 klass->SetVTable(vtable.Get()); 4200 } 4201 4202 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4203 for (int i = 0; i < vtable->GetLength(); ++i) { 4204 CHECK(vtable->Get(i) != NULL); 4205 } 4206 4207// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4208 4209 return true; 4210} 4211 4212bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4213 CHECK(klass.Get() != NULL); 4214 return LinkFields(klass, false, nullptr); 4215} 4216 4217bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass, size_t* class_size) { 4218 CHECK(klass.Get() != NULL); 4219 return LinkFields(klass, true, class_size); 4220} 4221 4222struct LinkFieldsComparator { 4223 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4224 } 4225 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4226 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4227 NO_THREAD_SAFETY_ANALYSIS { 4228 // First come reference fields, then 64-bit, and finally 32-bit 4229 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4230 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4231 if (type1 != type2) { 4232 bool is_primitive1 = type1 != Primitive::kPrimNot; 4233 bool is_primitive2 = type2 != Primitive::kPrimNot; 4234 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4235 type1 == Primitive::kPrimDouble); 4236 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4237 type2 == Primitive::kPrimDouble); 4238 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4239 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4240 if (order1 != order2) { 4241 return order1 < order2; 4242 } 4243 } 4244 // same basic group? then sort by string. 4245 return strcmp(field1->GetName(), field2->GetName()) < 0; 4246 } 4247}; 4248 4249bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static, size_t* class_size) { 4250 size_t num_fields = 4251 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4252 4253 mirror::ObjectArray<mirror::ArtField>* fields = 4254 is_static ? klass->GetSFields() : klass->GetIFields(); 4255 4256 // Initialize field_offset 4257 MemberOffset field_offset(0); 4258 if (is_static) { 4259 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 4260 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4261 // Static fields come after the embedded tables. 4262 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 4263 0, 0, 0); 4264 } 4265 field_offset = MemberOffset(base); 4266 } else { 4267 mirror::Class* super_class = klass->GetSuperClass(); 4268 if (super_class != NULL) { 4269 CHECK(super_class->IsResolved()) 4270 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4271 field_offset = MemberOffset(super_class->GetObjectSize()); 4272 } 4273 } 4274 4275 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4276 4277 // we want a relatively stable order so that adding new fields 4278 // minimizes disruption of C++ version such as Class and Method. 4279 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4280 for (size_t i = 0; i < num_fields; i++) { 4281 mirror::ArtField* f = fields->Get(i); 4282 CHECK(f != NULL) << PrettyClass(klass.Get()); 4283 grouped_and_sorted_fields.push_back(f); 4284 } 4285 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4286 LinkFieldsComparator()); 4287 4288 // References should be at the front. 4289 size_t current_field = 0; 4290 size_t num_reference_fields = 0; 4291 for (; current_field < num_fields; current_field++) { 4292 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4293 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4294 bool isPrimitive = type != Primitive::kPrimNot; 4295 if (isPrimitive) { 4296 break; // past last reference, move on to the next phase 4297 } 4298 grouped_and_sorted_fields.pop_front(); 4299 num_reference_fields++; 4300 fields->Set<false>(current_field, field); 4301 field->SetOffset(field_offset); 4302 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4303 } 4304 4305 // Now we want to pack all of the double-wide fields together. If 4306 // we're not aligned, though, we want to shuffle one 32-bit field 4307 // into place. If we can't find one, we'll have to pad it. 4308 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4309 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4310 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4311 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4312 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4313 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4314 continue; 4315 } 4316 fields->Set<false>(current_field++, field); 4317 field->SetOffset(field_offset); 4318 // drop the consumed field 4319 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4320 break; 4321 } 4322 // whether we found a 32-bit field for padding or not, we advance 4323 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4324 } 4325 4326 // Alignment is good, shuffle any double-wide fields forward, and 4327 // finish assigning field offsets to all fields. 4328 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 4329 << PrettyClass(klass.Get()); 4330 while (!grouped_and_sorted_fields.empty()) { 4331 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4332 grouped_and_sorted_fields.pop_front(); 4333 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4334 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4335 fields->Set<false>(current_field, field); 4336 field->SetOffset(field_offset); 4337 field_offset = MemberOffset(field_offset.Uint32Value() + 4338 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4339 ? sizeof(uint64_t) 4340 : sizeof(uint32_t))); 4341 current_field++; 4342 } 4343 4344 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4345 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4346 // We know there are no non-reference fields in the Reference classes, and we know 4347 // that 'referent' is alphabetically last, so this is easy... 4348 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4349 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4350 --num_reference_fields; 4351 } 4352 4353 if (kIsDebugBuild) { 4354 // Make sure that all reference fields appear before 4355 // non-reference fields, and all double-wide fields are aligned. 4356 bool seen_non_ref = false; 4357 for (size_t i = 0; i < num_fields; i++) { 4358 mirror::ArtField* field = fields->Get(i); 4359 if (false) { // enable to debug field layout 4360 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4361 << " class=" << PrettyClass(klass.Get()) 4362 << " field=" << PrettyField(field) 4363 << " offset=" 4364 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4365 } 4366 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4367 bool is_primitive = type != Primitive::kPrimNot; 4368 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4369 strcmp("referent", field->GetName()) == 0) { 4370 is_primitive = true; // We lied above, so we have to expect a lie here. 4371 } 4372 if (is_primitive) { 4373 if (!seen_non_ref) { 4374 seen_non_ref = true; 4375 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4376 } 4377 } else { 4378 DCHECK(!seen_non_ref) << PrettyField(field); 4379 } 4380 } 4381 if (!seen_non_ref) { 4382 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4383 } 4384 } 4385 4386 size_t size = field_offset.Uint32Value(); 4387 // Update klass 4388 if (is_static) { 4389 klass->SetNumReferenceStaticFields(num_reference_fields); 4390 *class_size = size; 4391 } else { 4392 klass->SetNumReferenceInstanceFields(num_reference_fields); 4393 if (!klass->IsVariableSize()) { 4394 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(); 4395 size_t previous_size = klass->GetObjectSize(); 4396 if (previous_size != 0) { 4397 // Make sure that we didn't originally have an incorrect size. 4398 CHECK_EQ(previous_size, size) << klass->GetDescriptor(); 4399 } 4400 klass->SetObjectSize(size); 4401 } 4402 } 4403 return true; 4404} 4405 4406// Set the bitmap of reference offsets, refOffsets, from the ifields 4407// list. 4408void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4409 uint32_t reference_offsets = 0; 4410 mirror::Class* super_class = klass->GetSuperClass(); 4411 if (super_class != NULL) { 4412 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4413 // If our superclass overflowed, we don't stand a chance. 4414 if (reference_offsets == CLASS_WALK_SUPER) { 4415 klass->SetReferenceInstanceOffsets(reference_offsets); 4416 return; 4417 } 4418 } 4419 CreateReferenceOffsets(klass, false, reference_offsets); 4420} 4421 4422void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4423 CreateReferenceOffsets(klass, true, 0); 4424} 4425 4426void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4427 uint32_t reference_offsets) { 4428 size_t num_reference_fields = 4429 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4430 : klass->NumReferenceInstanceFieldsDuringLinking(); 4431 mirror::ObjectArray<mirror::ArtField>* fields = 4432 is_static ? klass->GetSFields() : klass->GetIFields(); 4433 // All of the fields that contain object references are guaranteed 4434 // to be at the beginning of the fields list. 4435 for (size_t i = 0; i < num_reference_fields; ++i) { 4436 // Note that byte_offset is the offset from the beginning of 4437 // object, not the offset into instance data 4438 mirror::ArtField* field = fields->Get(i); 4439 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4440 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4441 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4442 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4443 CHECK_NE(new_bit, 0U); 4444 reference_offsets |= new_bit; 4445 } else { 4446 reference_offsets = CLASS_WALK_SUPER; 4447 break; 4448 } 4449 } 4450 // Update fields in klass 4451 if (is_static) { 4452 klass->SetReferenceStaticOffsets(reference_offsets); 4453 } else { 4454 klass->SetReferenceInstanceOffsets(reference_offsets); 4455 } 4456} 4457 4458mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4459 Handle<mirror::DexCache> dex_cache) { 4460 DCHECK(dex_cache.Get() != nullptr); 4461 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4462 if (resolved != NULL) { 4463 return resolved; 4464 } 4465 uint32_t utf16_length; 4466 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4467 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4468 dex_cache->SetResolvedString(string_idx, string); 4469 return string; 4470} 4471 4472mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4473 mirror::Class* referrer) { 4474 StackHandleScope<2> hs(Thread::Current()); 4475 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4476 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4477 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4478} 4479 4480mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4481 Handle<mirror::DexCache> dex_cache, 4482 Handle<mirror::ClassLoader> class_loader) { 4483 DCHECK(dex_cache.Get() != NULL); 4484 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4485 if (resolved == NULL) { 4486 Thread* self = Thread::Current(); 4487 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4488 resolved = FindClass(self, descriptor, class_loader); 4489 if (resolved != NULL) { 4490 // TODO: we used to throw here if resolved's class loader was not the 4491 // boot class loader. This was to permit different classes with the 4492 // same name to be loaded simultaneously by different loaders 4493 dex_cache->SetResolvedType(type_idx, resolved); 4494 } else { 4495 CHECK(self->IsExceptionPending()) 4496 << "Expected pending exception for failed resolution of: " << descriptor; 4497 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4498 StackHandleScope<1> hs(self); 4499 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4500 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4501 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4502 self->ClearException(); 4503 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4504 self->GetException(NULL)->SetCause(cause.Get()); 4505 } 4506 } 4507 } 4508 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4509 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4510 return resolved; 4511} 4512 4513mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 4514 Handle<mirror::DexCache> dex_cache, 4515 Handle<mirror::ClassLoader> class_loader, 4516 Handle<mirror::ArtMethod> referrer, 4517 InvokeType type) { 4518 DCHECK(dex_cache.Get() != NULL); 4519 // Check for hit in the dex cache. 4520 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4521 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 4522 return resolved; 4523 } 4524 // Fail, get the declaring class. 4525 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4526 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4527 if (klass == NULL) { 4528 DCHECK(Thread::Current()->IsExceptionPending()); 4529 return NULL; 4530 } 4531 // Scan using method_idx, this saves string compares but will only hit for matching dex 4532 // caches/files. 4533 switch (type) { 4534 case kDirect: // Fall-through. 4535 case kStatic: 4536 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 4537 break; 4538 case kInterface: 4539 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 4540 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4541 break; 4542 case kSuper: // Fall-through. 4543 case kVirtual: 4544 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 4545 break; 4546 default: 4547 LOG(FATAL) << "Unreachable - invocation type: " << type; 4548 } 4549 if (resolved == NULL) { 4550 // Search by name, which works across dex files. 4551 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4552 const Signature signature = dex_file.GetMethodSignature(method_id); 4553 switch (type) { 4554 case kDirect: // Fall-through. 4555 case kStatic: 4556 resolved = klass->FindDirectMethod(name, signature); 4557 break; 4558 case kInterface: 4559 resolved = klass->FindInterfaceMethod(name, signature); 4560 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4561 break; 4562 case kSuper: // Fall-through. 4563 case kVirtual: 4564 resolved = klass->FindVirtualMethod(name, signature); 4565 break; 4566 } 4567 } 4568 if (resolved != NULL) { 4569 // We found a method, check for incompatible class changes. 4570 if (resolved->CheckIncompatibleClassChange(type)) { 4571 resolved = NULL; 4572 } 4573 } 4574 if (resolved != NULL) { 4575 // Be a good citizen and update the dex cache to speed subsequent calls. 4576 dex_cache->SetResolvedMethod(method_idx, resolved); 4577 return resolved; 4578 } else { 4579 // We failed to find the method which means either an access error, an incompatible class 4580 // change, or no such method. First try to find the method among direct and virtual methods. 4581 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4582 const Signature signature = dex_file.GetMethodSignature(method_id); 4583 switch (type) { 4584 case kDirect: 4585 case kStatic: 4586 resolved = klass->FindVirtualMethod(name, signature); 4587 break; 4588 case kInterface: 4589 case kVirtual: 4590 case kSuper: 4591 resolved = klass->FindDirectMethod(name, signature); 4592 break; 4593 } 4594 4595 // If we found something, check that it can be accessed by the referrer. 4596 if (resolved != NULL && referrer.Get() != NULL) { 4597 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4598 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4599 if (!referring_class->CanAccess(methods_class)) { 4600 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4601 resolved, type); 4602 return NULL; 4603 } else if (!referring_class->CanAccessMember(methods_class, 4604 resolved->GetAccessFlags())) { 4605 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4606 return NULL; 4607 } 4608 } 4609 4610 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4611 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4612 switch (type) { 4613 case kDirect: 4614 case kStatic: 4615 if (resolved != NULL) { 4616 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4617 } else { 4618 resolved = klass->FindInterfaceMethod(name, signature); 4619 if (resolved != NULL) { 4620 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4621 } else { 4622 ThrowNoSuchMethodError(type, klass, name, signature); 4623 } 4624 } 4625 break; 4626 case kInterface: 4627 if (resolved != NULL) { 4628 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4629 } else { 4630 resolved = klass->FindVirtualMethod(name, signature); 4631 if (resolved != NULL) { 4632 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4633 } else { 4634 ThrowNoSuchMethodError(type, klass, name, signature); 4635 } 4636 } 4637 break; 4638 case kSuper: 4639 ThrowNoSuchMethodError(type, klass, name, signature); 4640 break; 4641 case kVirtual: 4642 if (resolved != NULL) { 4643 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4644 } else { 4645 resolved = klass->FindInterfaceMethod(name, signature); 4646 if (resolved != NULL) { 4647 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4648 } else { 4649 ThrowNoSuchMethodError(type, klass, name, signature); 4650 } 4651 } 4652 break; 4653 } 4654 DCHECK(Thread::Current()->IsExceptionPending()); 4655 return NULL; 4656 } 4657} 4658 4659mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4660 Handle<mirror::DexCache> dex_cache, 4661 Handle<mirror::ClassLoader> class_loader, 4662 bool is_static) { 4663 DCHECK(dex_cache.Get() != nullptr); 4664 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4665 if (resolved != NULL) { 4666 return resolved; 4667 } 4668 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4669 Thread* const self = Thread::Current(); 4670 StackHandleScope<1> hs(self); 4671 Handle<mirror::Class> klass( 4672 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4673 if (klass.Get() == NULL) { 4674 DCHECK(Thread::Current()->IsExceptionPending()); 4675 return NULL; 4676 } 4677 4678 if (is_static) { 4679 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 4680 } else { 4681 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 4682 } 4683 4684 if (resolved == NULL) { 4685 const char* name = dex_file.GetFieldName(field_id); 4686 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4687 if (is_static) { 4688 resolved = mirror::Class::FindStaticField(self, klass, name, type); 4689 } else { 4690 resolved = klass->FindInstanceField(name, type); 4691 } 4692 if (resolved == NULL) { 4693 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 4694 return NULL; 4695 } 4696 } 4697 dex_cache->SetResolvedField(field_idx, resolved); 4698 return resolved; 4699} 4700 4701mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4702 uint32_t field_idx, 4703 Handle<mirror::DexCache> dex_cache, 4704 Handle<mirror::ClassLoader> class_loader) { 4705 DCHECK(dex_cache.Get() != nullptr); 4706 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4707 if (resolved != NULL) { 4708 return resolved; 4709 } 4710 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4711 Thread* self = Thread::Current(); 4712 StackHandleScope<1> hs(self); 4713 Handle<mirror::Class> klass( 4714 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4715 if (klass.Get() == NULL) { 4716 DCHECK(Thread::Current()->IsExceptionPending()); 4717 return NULL; 4718 } 4719 4720 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4721 StringPiece type(dex_file.StringDataByIdx( 4722 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4723 resolved = mirror::Class::FindField(self, klass, name, type); 4724 if (resolved != NULL) { 4725 dex_cache->SetResolvedField(field_idx, resolved); 4726 } else { 4727 ThrowNoSuchFieldError("", klass.Get(), type, name); 4728 } 4729 return resolved; 4730} 4731 4732const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4733 uint32_t* length) { 4734 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4735 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4736 const DexFile& dex_file = *dex_cache->GetDexFile(); 4737 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4738 return dex_file.GetMethodShorty(method_id, length); 4739} 4740 4741void ClassLinker::DumpAllClasses(int flags) { 4742 if (dex_cache_image_class_lookup_required_) { 4743 MoveImageClassesToClassTable(); 4744 } 4745 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4746 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4747 std::vector<mirror::Class*> all_classes; 4748 { 4749 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4750 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 4751 mirror::Class** root = &it.second; 4752 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 4753 all_classes.push_back(klass); 4754 } 4755 } 4756 4757 for (size_t i = 0; i < all_classes.size(); ++i) { 4758 all_classes[i]->DumpClass(std::cerr, flags); 4759 } 4760} 4761 4762void ClassLinker::DumpForSigQuit(std::ostream& os) { 4763 if (dex_cache_image_class_lookup_required_) { 4764 MoveImageClassesToClassTable(); 4765 } 4766 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4767 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4768} 4769 4770size_t ClassLinker::NumLoadedClasses() { 4771 if (dex_cache_image_class_lookup_required_) { 4772 MoveImageClassesToClassTable(); 4773 } 4774 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4775 return class_table_.size(); 4776} 4777 4778pid_t ClassLinker::GetClassesLockOwner() { 4779 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4780} 4781 4782pid_t ClassLinker::GetDexLockOwner() { 4783 return dex_lock_.GetExclusiveOwnerTid(); 4784} 4785 4786void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4787 DCHECK(!init_done_); 4788 4789 DCHECK(klass != NULL); 4790 DCHECK(klass->GetClassLoader() == NULL); 4791 4792 mirror::ObjectArray<mirror::Class>* class_roots = 4793 ReadBarrier::BarrierForRoot<mirror::ObjectArray<mirror::Class>, kWithReadBarrier>( 4794 &class_roots_); 4795 DCHECK(class_roots != NULL); 4796 DCHECK(class_roots->Get(class_root) == NULL); 4797 class_roots->Set<false>(class_root, klass); 4798} 4799 4800} // namespace art 4801