class_linker.cc revision e9e3e697f0c426132bee10aaa6aee9107d2d7dc6
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 "oat.h" 46#include "oat_file.h" 47#include "mirror/art_field-inl.h" 48#include "mirror/art_method-inl.h" 49#include "mirror/class.h" 50#include "mirror/class-inl.h" 51#include "mirror/class_loader.h" 52#include "mirror/dex_cache-inl.h" 53#include "mirror/iftable-inl.h" 54#include "mirror/object-inl.h" 55#include "mirror/object_array-inl.h" 56#include "mirror/proxy.h" 57#include "mirror/stack_trace_element.h" 58#include "object_utils.h" 59#include "os.h" 60#include "runtime.h" 61#include "entrypoints/entrypoint_utils.h" 62#include "ScopedLocalRef.h" 63#include "scoped_thread_state_change.h" 64#include "handle_scope-inl.h" 65#include "thread.h" 66#include "utils.h" 67#include "verifier/method_verifier.h" 68#include "well_known_classes.h" 69 70namespace art { 71 72static void ThrowNoClassDefFoundError(const char* fmt, ...) 73 __attribute__((__format__(__printf__, 1, 2))) 74 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 75static void ThrowNoClassDefFoundError(const char* fmt, ...) { 76 va_list args; 77 va_start(args, fmt); 78 Thread* self = Thread::Current(); 79 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 80 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 81 va_end(args); 82} 83 84static void ThrowEarlierClassFailure(mirror::Class* c) 85 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 86 // The class failed to initialize on a previous attempt, so we want to throw 87 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 88 // failed in verification, in which case v2 5.4.1 says we need to re-throw 89 // the previous error. 90 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 91 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 92 } 93 94 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 95 Thread* self = Thread::Current(); 96 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 97 if (c->GetVerifyErrorClass() != NULL) { 98 // TODO: change the verifier to store an _instance_, with a useful detail message? 99 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor().c_str(), 100 PrettyDescriptor(c).c_str()); 101 } else { 102 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 103 PrettyDescriptor(c).c_str()); 104 } 105} 106 107static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 108 Thread* self = Thread::Current(); 109 JNIEnv* env = self->GetJniEnv(); 110 111 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 112 CHECK(cause.get() != NULL); 113 114 env->ExceptionClear(); 115 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 116 env->Throw(cause.get()); 117 118 // We only wrap non-Error exceptions; an Error can just be used as-is. 119 if (!is_error) { 120 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 121 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 122 } 123} 124 125static size_t Hash(const char* s) { 126 // This is the java.lang.String hashcode for convenience, not interoperability. 127 size_t hash = 0; 128 for (; *s != '\0'; ++s) { 129 hash = hash * 31 + *s; 130 } 131 return hash; 132} 133 134const char* ClassLinker::class_roots_descriptors_[] = { 135 "Ljava/lang/Class;", 136 "Ljava/lang/Object;", 137 "[Ljava/lang/Class;", 138 "[Ljava/lang/Object;", 139 "Ljava/lang/String;", 140 "Ljava/lang/DexCache;", 141 "Ljava/lang/ref/Reference;", 142 "Ljava/lang/reflect/ArtField;", 143 "Ljava/lang/reflect/ArtMethod;", 144 "Ljava/lang/reflect/Proxy;", 145 "[Ljava/lang/String;", 146 "[Ljava/lang/reflect/ArtField;", 147 "[Ljava/lang/reflect/ArtMethod;", 148 "Ljava/lang/ClassLoader;", 149 "Ljava/lang/Throwable;", 150 "Ljava/lang/ClassNotFoundException;", 151 "Ljava/lang/StackTraceElement;", 152 "Z", 153 "B", 154 "C", 155 "D", 156 "F", 157 "I", 158 "J", 159 "S", 160 "V", 161 "[Z", 162 "[B", 163 "[C", 164 "[D", 165 "[F", 166 "[I", 167 "[J", 168 "[S", 169 "[Ljava/lang/StackTraceElement;", 170}; 171 172ClassLinker::ClassLinker(InternTable* intern_table) 173 // dex_lock_ is recursive as it may be used in stack dumping. 174 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 175 dex_cache_image_class_lookup_required_(false), 176 failed_dex_cache_class_lookups_(0), 177 class_roots_(nullptr), 178 array_iftable_(nullptr), 179 find_array_class_cache_next_victim_(0), 180 init_done_(false), 181 log_new_dex_caches_roots_(false), 182 log_new_class_table_roots_(false), 183 intern_table_(intern_table), 184 portable_resolution_trampoline_(nullptr), 185 quick_resolution_trampoline_(nullptr), 186 portable_imt_conflict_trampoline_(nullptr), 187 quick_imt_conflict_trampoline_(nullptr), 188 quick_generic_jni_trampoline_(nullptr), 189 quick_to_interpreter_bridge_trampoline_(nullptr) { 190 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 191 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 192} 193 194// To set a value for generic JNI. May be necessary in compiler tests. 195extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 196 197void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 198 VLOG(startup) << "ClassLinker::Init"; 199 CHECK(Runtime::Current()->IsCompiler()); 200 201 CHECK(!init_done_); 202 203 // java_lang_Class comes first, it's needed for AllocClass 204 Thread* self = Thread::Current(); 205 gc::Heap* heap = Runtime::Current()->GetHeap(); 206 // The GC can't handle an object with a null class since we can't get the size of this object. 207 heap->IncrementDisableMovingGC(self); 208 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 209 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 210 heap->AllocNonMovableObject<true>(self, nullptr, sizeof(mirror::ClassClass), 211 VoidFunctor())))); 212 CHECK(java_lang_Class.Get() != NULL); 213 mirror::Class::SetClassClass(java_lang_Class.Get()); 214 java_lang_Class->SetClass(java_lang_Class.Get()); 215 if (kUseBakerOrBrooksReadBarrier) { 216 java_lang_Class->AssertReadBarrierPointer(); 217 } 218 java_lang_Class->SetClassSize(sizeof(mirror::ClassClass)); 219 heap->DecrementDisableMovingGC(self); 220 // AllocClass(mirror::Class*) can now be used 221 222 // Class[] is used for reflection support. 223 Handle<mirror::Class> class_array_class( 224 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 225 class_array_class->SetComponentType(java_lang_Class.Get()); 226 227 // java_lang_Object comes next so that object_array_class can be created. 228 Handle<mirror::Class> java_lang_Object( 229 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 230 CHECK(java_lang_Object.Get() != NULL); 231 // backfill Object as the super class of Class. 232 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 233 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 234 235 // Object[] next to hold class roots. 236 Handle<mirror::Class> object_array_class( 237 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 238 object_array_class->SetComponentType(java_lang_Object.Get()); 239 240 // Setup the char class to be used for char[]. 241 Handle<mirror::Class> char_class(hs.NewHandle(AllocClass(self, java_lang_Class.Get(), 242 sizeof(mirror::Class)))); 243 244 // Setup the char[] class to be used for String. 245 Handle<mirror::Class> char_array_class(hs.NewHandle(AllocClass(self, java_lang_Class.Get(), 246 sizeof(mirror::Class)))); 247 char_array_class->SetComponentType(char_class.Get()); 248 mirror::CharArray::SetArrayClass(char_array_class.Get()); 249 250 // Setup String. 251 Handle<mirror::Class> java_lang_String(hs.NewHandle(AllocClass(self, java_lang_Class.Get(), 252 sizeof(mirror::StringClass)))); 253 mirror::String::SetClass(java_lang_String.Get()); 254 java_lang_String->SetObjectSize(sizeof(mirror::String)); 255 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 256 257 // Create storage for root classes, save away our work so far (requires descriptors). 258 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 259 kClassRootsMax); 260 CHECK(class_roots_ != NULL); 261 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 262 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 263 SetClassRoot(kClassArrayClass, class_array_class.Get()); 264 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 265 SetClassRoot(kCharArrayClass, char_array_class.Get()); 266 SetClassRoot(kJavaLangString, java_lang_String.Get()); 267 268 // Setup the primitive type classes. 269 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 270 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 271 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 272 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 273 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 274 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 275 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 276 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 277 278 // Create array interface entries to populate once we can load system classes. 279 array_iftable_ = AllocIfTable(self, 2); 280 281 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 282 Handle<mirror::Class> int_array_class( 283 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 284 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 285 mirror::IntArray::SetArrayClass(int_array_class.Get()); 286 SetClassRoot(kIntArrayClass, int_array_class.Get()); 287 288 // now that these are registered, we can use AllocClass() and AllocObjectArray 289 290 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 291 Handle<mirror::Class> java_lang_DexCache( 292 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::DexCacheClass)))); 293 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 294 java_lang_DexCache->SetObjectSize(sizeof(mirror::DexCache)); 295 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 296 297 // Constructor, Field, Method, and AbstractMethod are necessary so 298 // that FindClass can link members. 299 Handle<mirror::Class> java_lang_reflect_ArtField( 300 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::ArtFieldClass)))); 301 CHECK(java_lang_reflect_ArtField.Get() != NULL); 302 java_lang_reflect_ArtField->SetObjectSize(sizeof(mirror::ArtField)); 303 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 304 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 305 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 306 307 Handle<mirror::Class> java_lang_reflect_ArtMethod( 308 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::ArtMethodClass)))); 309 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 310 java_lang_reflect_ArtMethod->SetObjectSize(sizeof(mirror::ArtMethod)); 311 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 312 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 313 314 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 315 316 // Set up array classes for string, field, method 317 Handle<mirror::Class> object_array_string( 318 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 319 object_array_string->SetComponentType(java_lang_String.Get()); 320 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 321 322 Handle<mirror::Class> object_array_art_method( 323 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 324 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 325 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 326 327 Handle<mirror::Class> object_array_art_field( 328 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 329 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 330 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 331 332 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 333 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 334 // these roots. 335 CHECK_NE(0U, boot_class_path.size()); 336 for (size_t i = 0; i != boot_class_path.size(); ++i) { 337 const DexFile* dex_file = boot_class_path[i]; 338 CHECK(dex_file != NULL); 339 AppendToBootClassPath(*dex_file); 340 } 341 342 // now we can use FindSystemClass 343 344 // run char class through InitializePrimitiveClass to finish init 345 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 346 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 347 348 // Create runtime resolution and imt conflict methods. Also setup the default imt. 349 Runtime* runtime = Runtime::Current(); 350 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 351 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 352 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 353 354 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 355 // we do not need friend classes or a publicly exposed setter. 356 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 357 358 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 359 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 360 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 361 CHECK_EQ(java_lang_Object.Get(), Object_class); 362 CHECK_EQ(java_lang_Object->GetObjectSize(), sizeof(mirror::Object)); 363 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 364 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 365 CHECK_EQ(java_lang_String.Get(), String_class); 366 CHECK_EQ(java_lang_String->GetObjectSize(), sizeof(mirror::String)); 367 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 368 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 369 CHECK_EQ(java_lang_String.Get(), String_class); 370 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 371 CHECK_EQ(java_lang_DexCache->GetObjectSize(), sizeof(mirror::DexCache)); 372 373 // Setup the primitive array type classes - can't be done until Object has a vtable. 374 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 375 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 376 377 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 378 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 379 380 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 381 CHECK_EQ(char_array_class.Get(), found_char_array_class); 382 383 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 384 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 385 386 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 387 CHECK_EQ(int_array_class.Get(), found_int_array_class); 388 389 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 390 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 391 392 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 393 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 394 395 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 396 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 397 398 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 399 CHECK_EQ(class_array_class.Get(), found_class_array_class); 400 401 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 402 CHECK_EQ(object_array_class.Get(), found_object_array_class); 403 404 // Setup the single, global copy of "iftable". 405 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 406 CHECK(java_lang_Cloneable != NULL); 407 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 408 CHECK(java_io_Serializable != NULL); 409 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 410 // crawl up and explicitly list all of the supers as well. 411 { 412 mirror::IfTable* array_iftable = 413 ReadBarrier::BarrierForRoot<mirror::IfTable, kWithReadBarrier>(&array_iftable_); 414 array_iftable->SetInterface(0, java_lang_Cloneable); 415 array_iftable->SetInterface(1, java_io_Serializable); 416 } 417 418 // Sanity check Class[] and Object[]'s interfaces. 419 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 420 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 421 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 422 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 423 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 424 // dex_cache_ fields and register them in class_table_. 425 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 426 CHECK_EQ(java_lang_Class.Get(), Class_class); 427 428 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 429 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 430 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 431 432 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 433 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 434 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 435 436 mirror::Class* String_array_class = 437 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 438 CHECK_EQ(object_array_string.Get(), String_array_class); 439 440 mirror::Class* Art_method_array_class = 441 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 442 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 443 444 mirror::Class* Art_field_array_class = 445 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 446 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 447 448 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 449 450 // Create java.lang.reflect.Proxy root. 451 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 452 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 453 454 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 455 mirror::Class* java_lang_ref_Reference = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 456 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference); 457 mirror::Class* java_lang_ref_FinalizerReference = 458 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 459 java_lang_ref_FinalizerReference->SetAccessFlags( 460 java_lang_ref_FinalizerReference->GetAccessFlags() | 461 kAccClassIsReference | kAccClassIsFinalizerReference); 462 mirror::Class* java_lang_ref_PhantomReference = 463 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 464 java_lang_ref_PhantomReference->SetAccessFlags( 465 java_lang_ref_PhantomReference->GetAccessFlags() | 466 kAccClassIsReference | kAccClassIsPhantomReference); 467 mirror::Class* java_lang_ref_SoftReference = 468 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 469 java_lang_ref_SoftReference->SetAccessFlags( 470 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 471 mirror::Class* java_lang_ref_WeakReference = 472 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 473 java_lang_ref_WeakReference->SetAccessFlags( 474 java_lang_ref_WeakReference->GetAccessFlags() | 475 kAccClassIsReference | kAccClassIsWeakReference); 476 477 // Setup the ClassLoader, verifying the object_size_. 478 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 479 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), sizeof(mirror::ClassLoader)); 480 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 481 482 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 483 // java.lang.StackTraceElement as a convenience. 484 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 485 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 486 SetClassRoot(kJavaLangClassNotFoundException, 487 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 488 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 489 SetClassRoot(kJavaLangStackTraceElementArrayClass, 490 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 491 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 492 493 FinishInit(self); 494 495 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 496} 497 498void ClassLinker::FinishInit(Thread* self) { 499 VLOG(startup) << "ClassLinker::FinishInit entering"; 500 501 // Let the heap know some key offsets into java.lang.ref instances 502 // Note: we hard code the field indexes here rather than using FindInstanceField 503 // as the types of the field can't be resolved prior to the runtime being 504 // fully initialized 505 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 506 mirror::Class* java_lang_ref_FinalizerReference = 507 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 508 509 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 510 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 511 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 512 513 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 514 CHECK_STREQ(queue->GetName(), "queue"); 515 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 516 517 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 518 CHECK_STREQ(queueNext->GetName(), "queueNext"); 519 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 520 521 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 522 CHECK_STREQ(referent->GetName(), "referent"); 523 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 524 525 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 526 CHECK_STREQ(zombie->GetName(), "zombie"); 527 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 528 529 // ensure all class_roots_ are initialized 530 for (size_t i = 0; i < kClassRootsMax; i++) { 531 ClassRoot class_root = static_cast<ClassRoot>(i); 532 mirror::Class* klass = GetClassRoot(class_root); 533 CHECK(klass != NULL); 534 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 535 // note SetClassRoot does additional validation. 536 // if possible add new checks there to catch errors early 537 } 538 539 CHECK(array_iftable_ != NULL); 540 541 // disable the slow paths in FindClass and CreatePrimitiveClass now 542 // that Object, Class, and Object[] are setup 543 init_done_ = true; 544 545 VLOG(startup) << "ClassLinker::FinishInit exiting"; 546} 547 548void ClassLinker::RunRootClinits() { 549 Thread* self = Thread::Current(); 550 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 551 mirror::Class* c = GetClassRoot(ClassRoot(i)); 552 if (!c->IsArrayClass() && !c->IsPrimitive()) { 553 StackHandleScope<1> hs(self); 554 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 555 EnsureInitialized(h_class, true, true); 556 self->AssertNoPendingException(); 557 } 558 } 559} 560 561bool ClassLinker::GenerateOatFile(const char* dex_filename, 562 int oat_fd, 563 const char* oat_cache_filename, 564 std::string* error_msg) { 565 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 566 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 567 568 gc::Heap* heap = Runtime::Current()->GetHeap(); 569 std::string boot_image_option("--boot-image="); 570 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 571 572 std::string dex_file_option("--dex-file="); 573 dex_file_option += dex_filename; 574 575 std::string oat_fd_option("--oat-fd="); 576 StringAppendF(&oat_fd_option, "%d", oat_fd); 577 578 std::string oat_location_option("--oat-location="); 579 oat_location_option += oat_cache_filename; 580 581 std::vector<std::string> argv; 582 argv.push_back(dex2oat); 583 argv.push_back("--runtime-arg"); 584 argv.push_back("-Xms64m"); 585 argv.push_back("--runtime-arg"); 586 argv.push_back("-Xmx64m"); 587 argv.push_back("--runtime-arg"); 588 argv.push_back("-classpath"); 589 argv.push_back("--runtime-arg"); 590 argv.push_back(Runtime::Current()->GetClassPathString()); 591 592 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 593 594 if (!Runtime::Current()->IsVerificationEnabled()) { 595 argv.push_back("--compiler-filter=verify-none"); 596 } 597 598 if (!kIsTargetBuild) { 599 argv.push_back("--host"); 600 } 601 602 argv.push_back(boot_image_option); 603 argv.push_back(dex_file_option); 604 argv.push_back(oat_fd_option); 605 argv.push_back(oat_location_option); 606 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 607 for (size_t i = 0; i < compiler_options.size(); ++i) { 608 argv.push_back(compiler_options[i].c_str()); 609 } 610 611 return Exec(argv, error_msg); 612} 613 614const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 615 WriterMutexLock mu(Thread::Current(), dex_lock_); 616 if (kIsDebugBuild) { 617 for (size_t i = 0; i < oat_files_.size(); ++i) { 618 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 619 } 620 } 621 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 622 oat_files_.push_back(oat_file); 623 return oat_file; 624} 625 626OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 627 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 628 OatFile* oat_file = space->ReleaseOatFile(); 629 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 630 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 631 return *oat_file; 632} 633 634const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 635 const char* dex_location = dex_file.GetLocation().c_str(); 636 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 637 return FindOpenedOatFileFromDexLocation(dex_location, &dex_location_checksum); 638} 639 640const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation( 641 const char* dex_location, const uint32_t* const dex_location_checksum) { 642 ReaderMutexLock mu(Thread::Current(), dex_lock_); 643 for (size_t i = 0; i < oat_files_.size(); i++) { 644 const OatFile* oat_file = oat_files_[i]; 645 DCHECK(oat_file != NULL); 646 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 647 dex_location_checksum, 648 false); 649 if (oat_dex_file != NULL) { 650 return oat_file; 651 } 652 } 653 return NULL; 654} 655 656const DexFile* ClassLinker::FindDexFileInOatLocation(const char* dex_location, 657 uint32_t dex_location_checksum, 658 const char* oat_location, 659 std::string* error_msg) { 660 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 661 !Runtime::Current()->IsCompiler(), 662 error_msg)); 663 if (oat_file.get() == nullptr) { 664 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 665 error_msg->c_str()); 666 return nullptr; 667 } 668 Runtime* runtime = Runtime::Current(); 669 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 670 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 671 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 672 if (expected_image_oat_checksum != actual_image_oat_checksum) { 673 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 674 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 675 actual_image_oat_checksum); 676 return nullptr; 677 } 678 679 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 680 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 681 if (expected_image_oat_offset != actual_image_oat_offset) { 682 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 683 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 684 actual_image_oat_offset); 685 return nullptr; 686 } 687 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 688 &dex_location_checksum); 689 if (oat_dex_file == nullptr) { 690 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 691 dex_location); 692 return nullptr; 693 } 694 uint32_t expected_dex_checksum = dex_location_checksum; 695 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 696 if (expected_dex_checksum != actual_dex_checksum) { 697 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 698 "found 0x%x", oat_location, expected_dex_checksum, 699 actual_dex_checksum); 700 return nullptr; 701 } 702 const DexFile* dex_file = oat_dex_file->OpenDexFile(error_msg); 703 if (dex_file != nullptr) { 704 RegisterOatFile(oat_file.release()); 705 } 706 return dex_file; 707} 708 709const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation( 710 const char* dex_location, 711 uint32_t dex_location_checksum, 712 const char* oat_location, 713 std::vector<std::string>* error_msgs) { 714 // We play a locking game here so that if two different processes 715 // race to generate (or worse, one tries to open a partial generated 716 // file) we will be okay. This is actually common with apps that use 717 // DexClassLoader to work around the dex method reference limit and 718 // that have a background service running in a separate process. 719 ScopedFlock scoped_flock; 720 std::string error_msg; 721 if (!scoped_flock.Init(oat_location, &error_msg)) { 722 error_msgs->push_back(error_msg); 723 return nullptr; 724 } 725 726 // Check if we already have an up-to-date output file 727 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, dex_location_checksum, 728 oat_location, &error_msg); 729 if (dex_file != nullptr) { 730 return dex_file; 731 } 732 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 733 dex_location, oat_location, error_msg.c_str()); 734 VLOG(class_linker) << compound_msg; 735 error_msgs->push_back(compound_msg); 736 737 // Generate the output oat file for the dex file 738 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 739 if (!GenerateOatFile(dex_location, scoped_flock.GetFile()->Fd(), oat_location, &error_msg)) { 740 CHECK(!error_msg.empty()); 741 error_msgs->push_back(error_msg); 742 return nullptr; 743 } 744 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 745 !Runtime::Current()->IsCompiler(), 746 &error_msg)); 747 if (oat_file.get() == nullptr) { 748 compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 749 oat_location, error_msg.c_str()); 750 error_msgs->push_back(compound_msg); 751 return nullptr; 752 } 753 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 754 &dex_location_checksum); 755 if (oat_dex_file == nullptr) { 756 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out file " 757 "'%s'", dex_location, dex_location_checksum, oat_location); 758 error_msgs->push_back(error_msg); 759 return nullptr; 760 } 761 const DexFile* result = oat_dex_file->OpenDexFile(&error_msg); 762 CHECK(result != nullptr) << error_msgs << ", " << error_msg; 763 CHECK_EQ(dex_location_checksum, result->GetLocationChecksum()) 764 << "dex_location=" << dex_location << " oat_location=" << oat_location << std::hex 765 << " dex_location_checksum=" << dex_location_checksum 766 << " DexFile::GetLocationChecksum()=" << result->GetLocationChecksum(); 767 RegisterOatFile(oat_file.release()); 768 return result; 769} 770 771bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 772 const char* dex_location, 773 uint32_t dex_location_checksum, 774 const InstructionSet instruction_set, 775 std::string* error_msg) { 776 Runtime* runtime = Runtime::Current(); 777 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 778 779 // If the requested instruction set is the same as the current runtime, 780 // we can use the checksums directly. If it isn't, we'll have to read the 781 // image header from the image for the right instruction set. 782 uint32_t image_oat_checksum = 0; 783 uintptr_t image_oat_data_begin = 0; 784 if (instruction_set == kRuntimeISA) { 785 const ImageHeader& image_header = image_space->GetImageHeader(); 786 image_oat_checksum = image_header.GetOatChecksum(); 787 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 788 } else { 789 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 790 image_space->GetImageLocation().c_str(), instruction_set)); 791 image_oat_checksum = image_header->GetOatChecksum(); 792 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 793 } 794 const OatHeader& oat_header = oat_file->GetOatHeader(); 795 bool image_check = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 796 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 797 798 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 799 &dex_location_checksum); 800 if (oat_dex_file == NULL) { 801 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 802 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 803 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 804 for (size_t i = 0; i < oat_dex_files.size(); i++) { 805 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 806 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 807 oat_file->GetLocation().c_str(), 808 oat_dex_file->GetDexFileLocation().c_str()); 809 } 810 return false; 811 } 812 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 813 814 if (image_check && dex_check) { 815 return true; 816 } 817 818 if (!image_check) { 819 ScopedObjectAccess soa(Thread::Current()); 820 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with (0x%x, %" PRIdPTR ")", 821 oat_file->GetLocation().c_str(), 822 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 823 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 824 image_oat_checksum, image_oat_data_begin); 825 } 826 if (!dex_check) { 827 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 828 oat_file->GetLocation().c_str(), 829 oat_dex_file->GetDexFileLocationChecksum(), 830 dex_location, dex_location_checksum); 831 } 832 return false; 833} 834 835const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const std::string& oat_file_location, 836 const char* dex_location, 837 std::string* error_msg, 838 bool* open_failed) { 839 std::unique_ptr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 840 if (oat_file.get() == nullptr) { 841 *open_failed = true; 842 return nullptr; 843 } 844 *open_failed = false; 845 const DexFile* dex_file = nullptr; 846 uint32_t dex_location_checksum; 847 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 848 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 849 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 850 // directory. 851 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 852 if (oat_dex_file == nullptr) { 853 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 854 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 855 error_msg->c_str()); 856 return nullptr; 857 } 858 dex_file = oat_dex_file->OpenDexFile(error_msg); 859 } else { 860 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 861 kRuntimeISA, error_msg); 862 if (!verified) { 863 return nullptr; 864 } 865 dex_file = oat_file->GetOatDexFile(dex_location, 866 &dex_location_checksum)->OpenDexFile(error_msg); 867 } 868 if (dex_file != nullptr) { 869 RegisterOatFile(oat_file.release()); 870 } 871 return dex_file; 872} 873 874const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation( 875 const char* dex_location, 876 const uint32_t* const dex_location_checksum, 877 InstructionSet isa, 878 std::vector<std::string>* error_msgs) { 879 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location, 880 dex_location_checksum); 881 if (open_oat_file != nullptr) { 882 const OatFile::OatDexFile* oat_dex_file = open_oat_file->GetOatDexFile(dex_location, 883 dex_location_checksum); 884 std::string error_msg; 885 const DexFile* ret = oat_dex_file->OpenDexFile(&error_msg); 886 if (ret == nullptr) { 887 error_msgs->push_back(error_msg); 888 } 889 return ret; 890 } 891 892 // Look for an existing file next to dex. for example, for 893 // /foo/bar/baz.jar, look for /foo/bar/<isa>/baz.odex. 894 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 895 bool open_failed; 896 std::string error_msg; 897 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(odex_filename, dex_location, 898 &error_msg, &open_failed); 899 if (dex_file != nullptr) { 900 return dex_file; 901 } 902 if (dex_location_checksum == nullptr) { 903 error_msgs->push_back(StringPrintf("Failed to open oat file from %s and no classes.dex found in" 904 "%s: %s", odex_filename.c_str(), dex_location, 905 error_msg.c_str())); 906 return nullptr; 907 } 908 909 std::string cache_error_msg; 910 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 911 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location, 912 dalvik_cache.c_str())); 913 dex_file = VerifyAndOpenDexFileFromOatFile(cache_location, dex_location, &cache_error_msg, 914 &open_failed); 915 if (dex_file != nullptr) { 916 return dex_file; 917 } 918 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 919 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 920 } 921 std::string compound_msg = StringPrintf("Failed to open oat file from %s (error '%s') or %s " 922 "(error '%s').", odex_filename.c_str(), error_msg.c_str(), 923 cache_location.c_str(), cache_error_msg.c_str()); 924 VLOG(class_linker) << compound_msg; 925 error_msgs->push_back(compound_msg); 926 927 // Try to generate oat file if it wasn't found or was obsolete. 928 return FindOrCreateOatFileForDexLocation(dex_location, *dex_location_checksum, 929 cache_location.c_str(), error_msgs); 930} 931 932const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 933 ReaderMutexLock mu(Thread::Current(), dex_lock_); 934 for (size_t i = 0; i < oat_files_.size(); i++) { 935 const OatFile* oat_file = oat_files_[i]; 936 DCHECK(oat_file != nullptr); 937 if (oat_file->GetLocation() == oat_location) { 938 return oat_file; 939 } 940 } 941 return nullptr; 942} 943 944const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 945 std::string* error_msg) { 946 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 947 if (oat_file != nullptr) { 948 return oat_file; 949 } 950 951 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 952 error_msg); 953 if (oat_file == NULL) { 954 return NULL; 955 } 956 return oat_file; 957} 958 959static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 960 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 961 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 962 963 DCHECK(obj != NULL); 964 DCHECK(class_linker != NULL); 965 966 if (obj->IsArtMethod()) { 967 mirror::ArtMethod* method = obj->AsArtMethod(); 968 if (!method->IsNative()) { 969 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 970 if (method != Runtime::Current()->GetResolutionMethod()) { 971 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 972 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 973 } 974 } 975 } 976} 977 978void ClassLinker::InitFromImage() { 979 VLOG(startup) << "ClassLinker::InitFromImage entering"; 980 CHECK(!init_done_); 981 982 Thread* self = Thread::Current(); 983 gc::Heap* heap = Runtime::Current()->GetHeap(); 984 gc::space::ImageSpace* space = heap->GetImageSpace(); 985 dex_cache_image_class_lookup_required_ = true; 986 CHECK(space != NULL); 987 OatFile& oat_file = GetImageOatFile(space); 988 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 989 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 990 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 991 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 992 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 993 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 994 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 995 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 996 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 997 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 998 mirror::ObjectArray<mirror::DexCache>* dex_caches = 999 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1000 1001 StackHandleScope<1> hs(self); 1002 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1003 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1004 AsObjectArray<mirror::Class>())); 1005 class_roots_ = class_roots.Get(); 1006 1007 // Special case of setting up the String class early so that we can test arbitrary objects 1008 // as being Strings or not 1009 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1010 1011 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1012 static_cast<uint32_t>(dex_caches->GetLength())); 1013 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1014 StackHandleScope<1> hs(self); 1015 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1016 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1017 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1018 nullptr); 1019 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1020 std::string error_msg; 1021 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1022 if (dex_file == NULL) { 1023 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1024 << " from within oat file " << oat_file.GetLocation() 1025 << " error '" << error_msg << "'"; 1026 } 1027 1028 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1029 1030 AppendToBootClassPath(*dex_file, dex_cache); 1031 } 1032 1033 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1034 // bitmap walk. 1035 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1036 1037 // Set entry point to interpreter if in InterpretOnly mode. 1038 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1039 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1040 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1041 } 1042 1043 // reinit class_roots_ 1044 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1045 class_roots_ = class_roots.Get(); 1046 1047 // reinit array_iftable_ from any array class instance, they should be == 1048 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1049 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1050 // String class root was set above 1051 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1052 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1053 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1054 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1055 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1056 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1057 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1058 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1059 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1060 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1061 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1062 1063 FinishInit(self); 1064 1065 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1066} 1067 1068void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1069 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1070 if ((flags & kVisitRootFlagAllRoots) != 0) { 1071 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1072 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1073 } 1074 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1075 for (auto& pair : new_class_roots_) { 1076 mirror::Object* old_ref = pair.second; 1077 callback(reinterpret_cast<mirror::Object**>(&pair.second), arg, 0, kRootStickyClass); 1078 if (UNLIKELY(pair.second != old_ref)) { 1079 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1080 // corresponding object. This is slow, but luckily for us, this may only happen with a 1081 // concurrent moving GC. 1082 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1083 it != end && it->first == pair.first; ++it) { 1084 // If the class stored matches the old class, update it to the new value. 1085 if (old_ref == it->second) { 1086 it->second = pair.second; 1087 } 1088 } 1089 } 1090 } 1091 } 1092 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1093 new_class_roots_.clear(); 1094 } 1095 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1096 log_new_class_table_roots_ = true; 1097 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1098 log_new_class_table_roots_ = false; 1099 } 1100 // We deliberately ignore the class roots in the image since we 1101 // handle image roots by using the MS/CMS rescanning of dirty cards. 1102} 1103 1104// Keep in sync with InitCallback. Anything we visit, we need to 1105// reinit references to when reinitializing a ClassLinker from a 1106// mapped image. 1107void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1108 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1109 Thread* self = Thread::Current(); 1110 { 1111 ReaderMutexLock mu(self, dex_lock_); 1112 if ((flags & kVisitRootFlagAllRoots) != 0) { 1113 for (mirror::DexCache*& dex_cache : dex_caches_) { 1114 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1115 } 1116 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1117 for (size_t index : new_dex_cache_roots_) { 1118 callback(reinterpret_cast<mirror::Object**>(&dex_caches_[index]), arg, 0, kRootVMInternal); 1119 } 1120 } 1121 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1122 new_dex_cache_roots_.clear(); 1123 } 1124 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1125 log_new_dex_caches_roots_ = true; 1126 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1127 log_new_dex_caches_roots_ = false; 1128 } 1129 } 1130 VisitClassRoots(callback, arg, flags); 1131 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1132 DCHECK(array_iftable_ != nullptr); 1133 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1134 if (find_array_class_cache_[i] != nullptr) { 1135 callback(reinterpret_cast<mirror::Object**>(&find_array_class_cache_[i]), arg, 0, 1136 kRootVMInternal); 1137 } 1138 } 1139} 1140 1141void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1142 if (dex_cache_image_class_lookup_required_) { 1143 MoveImageClassesToClassTable(); 1144 } 1145 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1146 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1147 mirror::Class** root = &it.second; 1148 mirror::Class* c = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 1149 if (!visitor(c, arg)) { 1150 return; 1151 } 1152 } 1153} 1154 1155static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1156 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1157 classes->insert(c); 1158 return true; 1159} 1160 1161void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1162 std::set<mirror::Class*> classes; 1163 VisitClasses(GetClassesVisitor, &classes); 1164 for (mirror::Class* klass : classes) { 1165 if (!visitor(klass, arg)) { 1166 return; 1167 } 1168 } 1169} 1170 1171ClassLinker::~ClassLinker() { 1172 mirror::Class::ResetClass(); 1173 mirror::String::ResetClass(); 1174 mirror::ArtField::ResetClass(); 1175 mirror::ArtMethod::ResetClass(); 1176 mirror::BooleanArray::ResetArrayClass(); 1177 mirror::ByteArray::ResetArrayClass(); 1178 mirror::CharArray::ResetArrayClass(); 1179 mirror::DoubleArray::ResetArrayClass(); 1180 mirror::FloatArray::ResetArrayClass(); 1181 mirror::IntArray::ResetArrayClass(); 1182 mirror::LongArray::ResetArrayClass(); 1183 mirror::ShortArray::ResetArrayClass(); 1184 mirror::Throwable::ResetClass(); 1185 mirror::StackTraceElement::ResetClass(); 1186 STLDeleteElements(&boot_class_path_); 1187 STLDeleteElements(&oat_files_); 1188} 1189 1190mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1191 gc::Heap* heap = Runtime::Current()->GetHeap(); 1192 StackHandleScope<16> hs(self); 1193 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1194 Handle<mirror::DexCache> dex_cache( 1195 hs.NewHandle(down_cast<mirror::DexCache*>( 1196 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1197 VoidFunctor())))); 1198 if (dex_cache.Get() == NULL) { 1199 return NULL; 1200 } 1201 Handle<mirror::String> 1202 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1203 if (location.Get() == NULL) { 1204 return NULL; 1205 } 1206 Handle<mirror::ObjectArray<mirror::String>> 1207 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1208 if (strings.Get() == NULL) { 1209 return NULL; 1210 } 1211 Handle<mirror::ObjectArray<mirror::Class>> 1212 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1213 if (types.Get() == NULL) { 1214 return NULL; 1215 } 1216 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1217 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1218 if (methods.Get() == NULL) { 1219 return NULL; 1220 } 1221 Handle<mirror::ObjectArray<mirror::ArtField>> 1222 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1223 if (fields.Get() == NULL) { 1224 return NULL; 1225 } 1226 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1227 fields.Get()); 1228 return dex_cache.Get(); 1229} 1230 1231// Used to initialize a class in the allocation code path to ensure it is guarded by a StoreStore 1232// fence. 1233class InitializeClassVisitor { 1234 public: 1235 explicit InitializeClassVisitor(uint32_t class_size) : class_size_(class_size) { 1236 } 1237 1238 void operator()(mirror::Object* obj, size_t usable_size) const 1239 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1240 DCHECK_LE(class_size_, usable_size); 1241 // Avoid AsClass as object is not yet in live bitmap or allocation stack. 1242 mirror::Class* klass = down_cast<mirror::Class*>(obj); 1243 // DCHECK(klass->IsClass()); 1244 klass->SetClassSize(class_size_); 1245 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1246 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1247 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1248 } 1249 1250 private: 1251 const uint32_t class_size_; 1252 1253 DISALLOW_COPY_AND_ASSIGN(InitializeClassVisitor); 1254}; 1255 1256mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1257 uint32_t class_size) { 1258 DCHECK_GE(class_size, sizeof(mirror::Class)); 1259 gc::Heap* heap = Runtime::Current()->GetHeap(); 1260 InitializeClassVisitor visitor(class_size); 1261 mirror::Object* k = kMovingClasses ? 1262 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1263 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1264 if (UNLIKELY(k == nullptr)) { 1265 CHECK(self->IsExceptionPending()); // OOME. 1266 return nullptr; 1267 } 1268 return k->AsClass(); 1269} 1270 1271mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1272 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1273} 1274 1275mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1276 return down_cast<mirror::ArtField*>( 1277 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1278} 1279 1280mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1281 return down_cast<mirror::ArtMethod*>( 1282 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1283} 1284 1285mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1286 Thread* self, size_t length) { 1287 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1288 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1289} 1290 1291static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1292 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1293 DCHECK(klass != NULL); 1294 // Wait for the class if it has not already been linked. 1295 if (!klass->IsResolved() && !klass->IsErroneous()) { 1296 StackHandleScope<1> hs(self); 1297 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1298 ObjectLock<mirror::Class> lock(self, h_class); 1299 // Check for circular dependencies between classes. 1300 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1301 ThrowClassCircularityError(h_class.Get()); 1302 h_class->SetStatus(mirror::Class::kStatusError, self); 1303 return nullptr; 1304 } 1305 // Wait for the pending initialization to complete. 1306 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1307 lock.WaitIgnoringInterrupts(); 1308 } 1309 } 1310 if (klass->IsErroneous()) { 1311 ThrowEarlierClassFailure(klass); 1312 return nullptr; 1313 } 1314 // Return the loaded class. No exceptions should be pending. 1315 CHECK(klass->IsResolved()) << PrettyClass(klass); 1316 self->AssertNoPendingException(); 1317 return klass; 1318} 1319 1320mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1321 Handle<mirror::ClassLoader> class_loader) { 1322 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1323 DCHECK(self != nullptr); 1324 self->AssertNoPendingException(); 1325 if (descriptor[1] == '\0') { 1326 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1327 // for primitive classes that aren't backed by dex files. 1328 return FindPrimitiveClass(descriptor[0]); 1329 } 1330 // Find the class in the loaded classes table. 1331 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1332 if (klass != NULL) { 1333 return EnsureResolved(self, klass); 1334 } 1335 // Class is not yet loaded. 1336 if (descriptor[0] == '[') { 1337 return CreateArrayClass(self, descriptor, class_loader); 1338 } else if (class_loader.Get() == nullptr) { 1339 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1340 if (pair.second != NULL) { 1341 StackHandleScope<1> hs(self); 1342 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1343 } 1344 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1345 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1346 // throw of a NoClassDefFoundError. 1347 if (IsInBootClassPath(descriptor)) { 1348 mirror::Class* system_class = FindSystemClass(self, descriptor); 1349 CHECK(system_class != NULL); 1350 return system_class; 1351 } 1352 // Next try the compile time class path. 1353 const std::vector<const DexFile*>* class_path; 1354 { 1355 ScopedObjectAccessUnchecked soa(self); 1356 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1357 soa.AddLocalReference<jobject>(class_loader.Get())); 1358 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1359 } 1360 1361 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1362 if (pair.second != NULL) { 1363 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1364 } 1365 1366 } else { 1367 ScopedObjectAccessUnchecked soa(self); 1368 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1369 soa.AddLocalReference<jobject>(class_loader.Get())); 1370 std::string class_name_string(DescriptorToDot(descriptor)); 1371 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1372 { 1373 ScopedThreadStateChange tsc(self, kNative); 1374 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1375 soa.Env()->NewStringUTF(class_name_string.c_str())); 1376 if (class_name_object.get() == NULL) { 1377 return NULL; 1378 } 1379 CHECK(class_loader_object.get() != NULL); 1380 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1381 WellKnownClasses::java_lang_ClassLoader_loadClass, 1382 class_name_object.get())); 1383 } 1384 if (self->IsExceptionPending()) { 1385 // If the ClassLoader threw, pass that exception up. 1386 return NULL; 1387 } else if (result.get() == NULL) { 1388 // broken loader - throw NPE to be compatible with Dalvik 1389 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1390 class_name_string.c_str()).c_str()); 1391 return NULL; 1392 } else { 1393 // success, return mirror::Class* 1394 return soa.Decode<mirror::Class*>(result.get()); 1395 } 1396 } 1397 1398 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1399 return NULL; 1400} 1401 1402mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1403 Handle<mirror::ClassLoader> class_loader, 1404 const DexFile& dex_file, 1405 const DexFile::ClassDef& dex_class_def) { 1406 Thread* self = Thread::Current(); 1407 StackHandleScope<2> hs(self); 1408 auto klass = hs.NewHandle<mirror::Class>(nullptr); 1409 // Load the class from the dex file. 1410 if (UNLIKELY(!init_done_)) { 1411 // finish up init of hand crafted class_roots_ 1412 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1413 klass.Assign(GetClassRoot(kJavaLangObject)); 1414 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1415 klass.Assign(GetClassRoot(kJavaLangClass)); 1416 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1417 klass.Assign(GetClassRoot(kJavaLangString)); 1418 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1419 klass.Assign(GetClassRoot(kJavaLangDexCache)); 1420 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1421 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 1422 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1423 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 1424 } else { 1425 klass.Assign(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1426 } 1427 } else { 1428 klass.Assign(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1429 } 1430 if (UNLIKELY(klass.Get() == NULL)) { 1431 CHECK(self->IsExceptionPending()); // Expect an OOME. 1432 return NULL; 1433 } 1434 klass->SetDexCache(FindDexCache(dex_file)); 1435 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 1436 // Check for a pending exception during load 1437 if (self->IsExceptionPending()) { 1438 klass->SetStatus(mirror::Class::kStatusError, self); 1439 return NULL; 1440 } 1441 ObjectLock<mirror::Class> lock(self, klass); 1442 klass->SetClinitThreadId(self->GetTid()); 1443 // Add the newly loaded class to the loaded classes table. 1444 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 1445 if (existing != NULL) { 1446 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1447 // this thread to block. 1448 return EnsureResolved(self, existing); 1449 } 1450 // Finish loading (if necessary) by finding parents 1451 CHECK(!klass->IsLoaded()); 1452 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1453 // Loading failed. 1454 klass->SetStatus(mirror::Class::kStatusError, self); 1455 return NULL; 1456 } 1457 CHECK(klass->IsLoaded()); 1458 // Link the class (if necessary) 1459 CHECK(!klass->IsResolved()); 1460 // TODO: Use fast jobjects? 1461 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1462 if (!LinkClass(self, klass, interfaces)) { 1463 // Linking failed. 1464 klass->SetStatus(mirror::Class::kStatusError, self); 1465 return NULL; 1466 } 1467 CHECK(klass->IsResolved()); 1468 1469 /* 1470 * We send CLASS_PREPARE events to the debugger from here. The 1471 * definition of "preparation" is creating the static fields for a 1472 * class and initializing them to the standard default values, but not 1473 * executing any code (that comes later, during "initialization"). 1474 * 1475 * We did the static preparation in LinkClass. 1476 * 1477 * The class has been prepared and resolved but possibly not yet verified 1478 * at this point. 1479 */ 1480 Dbg::PostClassPrepare(klass.Get()); 1481 1482 return klass.Get(); 1483} 1484 1485// Precomputes size that will be needed for Class, matching LinkStaticFields 1486uint32_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1487 const DexFile::ClassDef& dex_class_def) { 1488 const byte* class_data = dex_file.GetClassData(dex_class_def); 1489 size_t num_ref = 0; 1490 size_t num_32 = 0; 1491 size_t num_64 = 0; 1492 if (class_data != NULL) { 1493 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1494 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1495 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1496 char c = descriptor[0]; 1497 if (c == 'L' || c == '[') { 1498 num_ref++; 1499 } else if (c == 'J' || c == 'D') { 1500 num_64++; 1501 } else { 1502 num_32++; 1503 } 1504 } 1505 } 1506 // start with generic class data 1507 uint32_t size = sizeof(mirror::Class); 1508 // follow with reference fields which must be contiguous at start 1509 size += (num_ref * sizeof(uint32_t)); 1510 // if there are 64-bit fields to add, make sure they are aligned 1511 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1512 if (num_32 != 0) { 1513 // use an available 32-bit field for padding 1514 num_32--; 1515 } 1516 size += sizeof(uint32_t); // either way, we are adding a word 1517 DCHECK_EQ(size, RoundUp(size, 8)); 1518 } 1519 // tack on any 64-bit fields now that alignment is assured 1520 size += (num_64 * sizeof(uint64_t)); 1521 // tack on any remaining 32-bit fields 1522 size += (num_32 * sizeof(uint32_t)); 1523 return size; 1524} 1525 1526OatFile::OatClass ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1527 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1528 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1529 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1530 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1531 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1532 &dex_location_checksum); 1533 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1534 return oat_dex_file->GetOatClass(class_def_idx); 1535} 1536 1537static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1538 uint32_t method_idx) { 1539 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1540 const byte* class_data = dex_file.GetClassData(class_def); 1541 CHECK(class_data != NULL); 1542 ClassDataItemIterator it(dex_file, class_data); 1543 // Skip fields 1544 while (it.HasNextStaticField()) { 1545 it.Next(); 1546 } 1547 while (it.HasNextInstanceField()) { 1548 it.Next(); 1549 } 1550 // Process methods 1551 size_t class_def_method_index = 0; 1552 while (it.HasNextDirectMethod()) { 1553 if (it.GetMemberIndex() == method_idx) { 1554 return class_def_method_index; 1555 } 1556 class_def_method_index++; 1557 it.Next(); 1558 } 1559 while (it.HasNextVirtualMethod()) { 1560 if (it.GetMemberIndex() == method_idx) { 1561 return class_def_method_index; 1562 } 1563 class_def_method_index++; 1564 it.Next(); 1565 } 1566 DCHECK(!it.HasNext()); 1567 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1568 return 0; 1569} 1570 1571const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1572 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1573 // method for direct methods (or virtual methods made direct). 1574 mirror::Class* declaring_class = method->GetDeclaringClass(); 1575 size_t oat_method_index; 1576 if (method->IsStatic() || method->IsDirect()) { 1577 // Simple case where the oat method index was stashed at load time. 1578 oat_method_index = method->GetMethodIndex(); 1579 } else { 1580 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1581 // by search for its position in the declared virtual methods. 1582 oat_method_index = declaring_class->NumDirectMethods(); 1583 size_t end = declaring_class->NumVirtualMethods(); 1584 bool found = false; 1585 for (size_t i = 0; i < end; i++) { 1586 if (declaring_class->GetVirtualMethod(i) == method) { 1587 found = true; 1588 break; 1589 } 1590 oat_method_index++; 1591 } 1592 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1593 } 1594 DCHECK_EQ(oat_method_index, 1595 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1596 method->GetDeclaringClass()->GetDexClassDefIndex(), 1597 method->GetDexMethodIndex())); 1598 const OatFile::OatClass oat_class = GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1599 declaring_class->GetDexClassDefIndex()); 1600 1601 return oat_class.GetOatMethod(oat_method_index); 1602} 1603 1604// Special case to get oat code without overwriting a trampoline. 1605const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1606 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1607 if (method->IsProxyMethod()) { 1608 return GetQuickProxyInvokeHandler(); 1609 } 1610 const void* result = GetOatMethodFor(method).GetQuickCode(); 1611 if (result == nullptr) { 1612 if (method->IsNative()) { 1613 // No code and native? Use generic trampoline. 1614 result = GetQuickGenericJniTrampoline(); 1615 } else if (method->IsPortableCompiled()) { 1616 // No code? Do we expect portable code? 1617 result = GetQuickToPortableBridge(); 1618 } else { 1619 // No code? You must mean to go into the interpreter. 1620 result = GetQuickToInterpreterBridge(); 1621 } 1622 } 1623 return result; 1624} 1625 1626const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1627 bool* have_portable_code) { 1628 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1629 *have_portable_code = false; 1630 if (method->IsProxyMethod()) { 1631 return GetPortableProxyInvokeHandler(); 1632 } 1633 const OatFile::OatMethod oat_method = GetOatMethodFor(method); 1634 const void* result = oat_method.GetPortableCode(); 1635 if (result == nullptr) { 1636 if (oat_method.GetQuickCode() == nullptr) { 1637 // No code? You must mean to go into the interpreter. 1638 result = GetPortableToInterpreterBridge(); 1639 } else { 1640 // No code? But there's quick code, so use a bridge. 1641 result = GetPortableToQuickBridge(); 1642 } 1643 } else { 1644 *have_portable_code = true; 1645 } 1646 return result; 1647} 1648 1649const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1650 uint32_t method_idx) { 1651 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1652 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1653 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 1654} 1655 1656const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1657 uint32_t method_idx) { 1658 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1659 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1660 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 1661} 1662 1663// Returns true if the method must run with interpreter, false otherwise. 1664static bool NeedsInterpreter( 1665 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 1666 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1667 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1668 // No code: need interpreter. 1669 // May return true for native code, in the case of generic JNI 1670 // DCHECK(!method->IsNative()); 1671 return true; 1672 } 1673#ifdef ART_SEA_IR_MODE 1674 ScopedObjectAccess soa(Thread::Current()); 1675 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1676 LOG(INFO) << "Found " << PrettyMethod(method); 1677 return false; 1678 } 1679#endif 1680 // If interpreter mode is enabled, every method (except native and proxy) must 1681 // be run with interpreter. 1682 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1683 !method->IsNative() && !method->IsProxyMethod(); 1684} 1685 1686void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1687 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1688 if (klass->NumDirectMethods() == 0) { 1689 return; // No direct methods => no static methods. 1690 } 1691 Runtime* runtime = Runtime::Current(); 1692 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1693 return; // OAT file unavailable. 1694 } 1695 const DexFile& dex_file = klass->GetDexFile(); 1696 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 1697 CHECK(dex_class_def != nullptr); 1698 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1699 // There should always be class data if there were direct methods. 1700 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1701 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 1702 ClassDataItemIterator it(dex_file, class_data); 1703 // Skip fields 1704 while (it.HasNextStaticField()) { 1705 it.Next(); 1706 } 1707 while (it.HasNextInstanceField()) { 1708 it.Next(); 1709 } 1710 // Link the code of methods skipped by LinkCode. 1711 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1712 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1713 if (!method->IsStatic()) { 1714 // Only update static methods. 1715 continue; 1716 } 1717 const void* portable_code = oat_class.GetOatMethod(method_index).GetPortableCode(); 1718 const void* quick_code = oat_class.GetOatMethod(method_index).GetQuickCode(); 1719 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1720 bool have_portable_code = false; 1721 if (enter_interpreter) { 1722 // Use interpreter entry point. 1723 // Check whether the method is native, in which case it's generic JNI. 1724 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 1725 quick_code = GetQuickGenericJniTrampoline(); 1726 portable_code = GetPortableToQuickBridge(); 1727 } else { 1728 portable_code = GetPortableToInterpreterBridge(); 1729 quick_code = GetQuickToInterpreterBridge(); 1730 } 1731 } else { 1732 if (portable_code == nullptr) { 1733 portable_code = GetPortableToQuickBridge(); 1734 } else { 1735 have_portable_code = true; 1736 } 1737 if (quick_code == nullptr) { 1738 quick_code = GetQuickToPortableBridge(); 1739 } 1740 } 1741 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1742 have_portable_code); 1743 } 1744 // Ignore virtual methods on the iterator. 1745} 1746 1747void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 1748 const DexFile& dex_file, uint32_t dex_method_index, 1749 uint32_t method_index) { 1750 // Method shouldn't have already been linked. 1751 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1752 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1753 // Every kind of method should at least get an invoke stub from the oat_method. 1754 // non-abstract methods also get their code pointers. 1755 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1756 oat_method.LinkMethod(method.Get()); 1757 1758 // Install entry point from interpreter. 1759 Runtime* runtime = Runtime::Current(); 1760 bool enter_interpreter = NeedsInterpreter(method.Get(), 1761 method->GetEntryPointFromQuickCompiledCode(), 1762 method->GetEntryPointFromPortableCompiledCode()); 1763 if (enter_interpreter && !method->IsNative()) { 1764 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1765 } else { 1766 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1767 } 1768 1769 if (method->IsAbstract()) { 1770 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1771 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1772 return; 1773 } 1774 1775 bool have_portable_code = false; 1776 if (method->IsStatic() && !method->IsConstructor()) { 1777 // For static methods excluding the class initializer, install the trampoline. 1778 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1779 // after initializing class (see ClassLinker::InitializeClass method). 1780 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 1781 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 1782 } else if (enter_interpreter) { 1783 if (!method->IsNative()) { 1784 // Set entry point from compiled code if there's no code or in interpreter only mode. 1785 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1786 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1787 } else { 1788 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 1789 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1790 } 1791 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1792 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1793 have_portable_code = true; 1794 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1795 } else { 1796 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1797 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1798 } 1799 1800 if (method->IsNative()) { 1801 // Unregistering restores the dlsym lookup stub. 1802 method->UnregisterNative(Thread::Current()); 1803 1804 if (enter_interpreter) { 1805 // We have a native method here without code. Then it should have either the GenericJni 1806 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 1807 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 1808 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 1809 } 1810 } 1811 1812 // Allow instrumentation its chance to hijack code. 1813 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 1814 method->GetEntryPointFromQuickCompiledCode(), 1815 method->GetEntryPointFromPortableCompiledCode(), 1816 have_portable_code); 1817} 1818 1819void ClassLinker::LoadClass(const DexFile& dex_file, 1820 const DexFile::ClassDef& dex_class_def, 1821 Handle<mirror::Class> klass, 1822 mirror::ClassLoader* class_loader) { 1823 CHECK(klass.Get() != NULL); 1824 CHECK(klass->GetDexCache() != NULL); 1825 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1826 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1827 CHECK(descriptor != NULL); 1828 1829 klass->SetClass(GetClassRoot(kJavaLangClass)); 1830 if (kUseBakerOrBrooksReadBarrier) { 1831 klass->AssertReadBarrierPointer(); 1832 } 1833 uint32_t access_flags = dex_class_def.access_flags_; 1834 // Make sure that none of our runtime-only flags are set. 1835 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1836 klass->SetAccessFlags(access_flags); 1837 klass->SetClassLoader(class_loader); 1838 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1839 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1840 1841 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1842 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1843 1844 const byte* class_data = dex_file.GetClassData(dex_class_def); 1845 if (class_data == NULL) { 1846 return; // no fields or methods - for example a marker interface 1847 } 1848 1849 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1850 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 1851 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 1852 } else { 1853 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 1854 } 1855} 1856 1857void ClassLinker::LoadClassMembers(const DexFile& dex_file, 1858 const byte* class_data, 1859 Handle<mirror::Class> klass, 1860 mirror::ClassLoader* class_loader, 1861 const OatFile::OatClass* oat_class) { 1862 // Load fields. 1863 ClassDataItemIterator it(dex_file, class_data); 1864 Thread* self = Thread::Current(); 1865 if (it.NumStaticFields() != 0) { 1866 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1867 if (UNLIKELY(statics == NULL)) { 1868 CHECK(self->IsExceptionPending()); // OOME. 1869 return; 1870 } 1871 klass->SetSFields(statics); 1872 } 1873 if (it.NumInstanceFields() != 0) { 1874 mirror::ObjectArray<mirror::ArtField>* fields = 1875 AllocArtFieldArray(self, it.NumInstanceFields()); 1876 if (UNLIKELY(fields == NULL)) { 1877 CHECK(self->IsExceptionPending()); // OOME. 1878 return; 1879 } 1880 klass->SetIFields(fields); 1881 } 1882 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1883 StackHandleScope<1> hs(self); 1884 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 1885 if (UNLIKELY(sfield.Get() == NULL)) { 1886 CHECK(self->IsExceptionPending()); // OOME. 1887 return; 1888 } 1889 klass->SetStaticField(i, sfield.Get()); 1890 LoadField(dex_file, it, klass, sfield); 1891 } 1892 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1893 StackHandleScope<1> hs(self); 1894 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 1895 if (UNLIKELY(ifield.Get() == NULL)) { 1896 CHECK(self->IsExceptionPending()); // OOME. 1897 return; 1898 } 1899 klass->SetInstanceField(i, ifield.Get()); 1900 LoadField(dex_file, it, klass, ifield); 1901 } 1902 1903 // Load methods. 1904 if (it.NumDirectMethods() != 0) { 1905 // TODO: append direct methods to class object 1906 mirror::ObjectArray<mirror::ArtMethod>* directs = 1907 AllocArtMethodArray(self, it.NumDirectMethods()); 1908 if (UNLIKELY(directs == NULL)) { 1909 CHECK(self->IsExceptionPending()); // OOME. 1910 return; 1911 } 1912 klass->SetDirectMethods(directs); 1913 } 1914 if (it.NumVirtualMethods() != 0) { 1915 // TODO: append direct methods to class object 1916 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1917 AllocArtMethodArray(self, it.NumVirtualMethods()); 1918 if (UNLIKELY(virtuals == NULL)) { 1919 CHECK(self->IsExceptionPending()); // OOME. 1920 return; 1921 } 1922 klass->SetVirtualMethods(virtuals); 1923 } 1924 size_t class_def_method_index = 0; 1925 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1926 StackHandleScope<1> hs(self); 1927 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 1928 if (UNLIKELY(method.Get() == NULL)) { 1929 CHECK(self->IsExceptionPending()); // OOME. 1930 return; 1931 } 1932 klass->SetDirectMethod(i, method.Get()); 1933 if (oat_class != nullptr) { 1934 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 1935 } 1936 method->SetMethodIndex(class_def_method_index); 1937 class_def_method_index++; 1938 } 1939 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1940 StackHandleScope<1> hs(self); 1941 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 1942 if (UNLIKELY(method.Get() == NULL)) { 1943 CHECK(self->IsExceptionPending()); // OOME. 1944 return; 1945 } 1946 klass->SetVirtualMethod(i, method.Get()); 1947 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1948 if (oat_class != nullptr) { 1949 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 1950 } 1951 class_def_method_index++; 1952 } 1953 DCHECK(!it.HasNext()); 1954} 1955 1956void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1957 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 1958 uint32_t field_idx = it.GetMemberIndex(); 1959 dst->SetDexFieldIndex(field_idx); 1960 dst->SetDeclaringClass(klass.Get()); 1961 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1962} 1963 1964mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1965 const ClassDataItemIterator& it, 1966 Handle<mirror::Class> klass) { 1967 uint32_t dex_method_idx = it.GetMemberIndex(); 1968 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1969 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 1970 1971 mirror::ArtMethod* dst = AllocArtMethod(self); 1972 if (UNLIKELY(dst == NULL)) { 1973 CHECK(self->IsExceptionPending()); // OOME. 1974 return NULL; 1975 } 1976 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 1977 1978 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 1979 dst->SetDexMethodIndex(dex_method_idx); 1980 dst->SetDeclaringClass(klass.Get()); 1981 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 1982 1983 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 1984 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 1985 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 1986 1987 uint32_t access_flags = it.GetMemberAccessFlags(); 1988 1989 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 1990 // Set finalizable flag on declaring class. 1991 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 1992 // Void return type. 1993 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 1994 klass->SetFinalizable(); 1995 } else { 1996 std::string klass_descriptor = klass->GetDescriptor(); 1997 // The Enum class declares a "final" finalize() method to prevent subclasses from 1998 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 1999 // subclasses, so we exclude it here. 2000 // We also want to avoid setting the flag on Object, where we know that finalize() is 2001 // empty. 2002 if (klass_descriptor.compare("Ljava/lang/Object;") != 0 && 2003 klass_descriptor.compare("Ljava/lang/Enum;") != 0) { 2004 klass->SetFinalizable(); 2005 } 2006 } 2007 } 2008 } else if (method_name[0] == '<') { 2009 // Fix broken access flags for initializers. Bug 11157540. 2010 bool is_init = (strcmp("<init>", method_name) == 0); 2011 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2012 if (UNLIKELY(!is_init && !is_clinit)) { 2013 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2014 } else { 2015 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2016 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2017 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2018 access_flags |= kAccConstructor; 2019 } 2020 } 2021 } 2022 dst->SetAccessFlags(access_flags); 2023 2024 self->EndAssertNoThreadSuspension(old_cause); 2025 return dst; 2026} 2027 2028void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2029 Thread* self = Thread::Current(); 2030 StackHandleScope<1> hs(self); 2031 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2032 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2033 AppendToBootClassPath(dex_file, dex_cache); 2034} 2035 2036void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2037 Handle<mirror::DexCache> dex_cache) { 2038 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2039 boot_class_path_.push_back(&dex_file); 2040 RegisterDexFile(dex_file, dex_cache); 2041} 2042 2043bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2044 dex_lock_.AssertSharedHeld(Thread::Current()); 2045 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2046 mirror::DexCache* dex_cache = GetDexCache(i); 2047 if (dex_cache->GetDexFile() == &dex_file) { 2048 return true; 2049 } 2050 } 2051 return false; 2052} 2053 2054bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2055 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2056 return IsDexFileRegisteredLocked(dex_file); 2057} 2058 2059void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2060 Handle<mirror::DexCache> dex_cache) { 2061 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2062 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2063 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2064 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2065 dex_caches_.push_back(dex_cache.Get()); 2066 dex_cache->SetDexFile(&dex_file); 2067 if (log_new_dex_caches_roots_) { 2068 // TODO: This is not safe if we can remove dex caches. 2069 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2070 } 2071} 2072 2073void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2074 Thread* self = Thread::Current(); 2075 { 2076 ReaderMutexLock mu(self, dex_lock_); 2077 if (IsDexFileRegisteredLocked(dex_file)) { 2078 return; 2079 } 2080 } 2081 // Don't alloc while holding the lock, since allocation may need to 2082 // suspend all threads and another thread may need the dex_lock_ to 2083 // get to a suspend point. 2084 StackHandleScope<1> hs(self); 2085 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2086 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2087 { 2088 WriterMutexLock mu(self, dex_lock_); 2089 if (IsDexFileRegisteredLocked(dex_file)) { 2090 return; 2091 } 2092 RegisterDexFileLocked(dex_file, dex_cache); 2093 } 2094} 2095 2096void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2097 Handle<mirror::DexCache> dex_cache) { 2098 WriterMutexLock mu(Thread::Current(), dex_lock_); 2099 RegisterDexFileLocked(dex_file, dex_cache); 2100} 2101 2102mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2103 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2104 // Search assuming unique-ness of dex file. 2105 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2106 mirror::DexCache* dex_cache = GetDexCache(i); 2107 if (dex_cache->GetDexFile() == &dex_file) { 2108 return dex_cache; 2109 } 2110 } 2111 // Search matching by location name. 2112 std::string location(dex_file.GetLocation()); 2113 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2114 mirror::DexCache* dex_cache = GetDexCache(i); 2115 if (dex_cache->GetDexFile()->GetLocation() == location) { 2116 return dex_cache; 2117 } 2118 } 2119 // Failure, dump diagnostic and abort. 2120 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2121 mirror::DexCache* dex_cache = GetDexCache(i); 2122 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2123 } 2124 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2125 return NULL; 2126} 2127 2128void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2129 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2130 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2131 mirror::DexCache* dex_cache = GetDexCache(i); 2132 dex_cache->Fixup(resolution_method); 2133 } 2134} 2135 2136mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2137 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2138 if (UNLIKELY(klass == NULL)) { 2139 return NULL; 2140 } 2141 return InitializePrimitiveClass(klass, type); 2142} 2143 2144mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2145 Primitive::Type type) { 2146 CHECK(primitive_class != NULL); 2147 // Must hold lock on object when initializing. 2148 Thread* self = Thread::Current(); 2149 StackHandleScope<1> hs(self); 2150 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2151 ObjectLock<mirror::Class> lock(self, h_class); 2152 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2153 primitive_class->SetPrimitiveType(type); 2154 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2155 const char* descriptor = Primitive::Descriptor(type); 2156 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2157 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2158 return primitive_class; 2159} 2160 2161// Create an array class (i.e. the class object for the array, not the 2162// array itself). "descriptor" looks like "[C" or "[[[[B" or 2163// "[Ljava/lang/String;". 2164// 2165// If "descriptor" refers to an array of primitives, look up the 2166// primitive type's internally-generated class object. 2167// 2168// "class_loader" is the class loader of the class that's referring to 2169// us. It's used to ensure that we're looking for the element type in 2170// the right context. It does NOT become the class loader for the 2171// array class; that always comes from the base element class. 2172// 2173// Returns NULL with an exception raised on failure. 2174mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2175 Handle<mirror::ClassLoader> class_loader) { 2176 // Identify the underlying component type 2177 CHECK_EQ('[', descriptor[0]); 2178 StackHandleScope<2> hs(self); 2179 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2180 if (component_type.Get() == nullptr) { 2181 DCHECK(self->IsExceptionPending()); 2182 return nullptr; 2183 } 2184 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2185 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2186 return nullptr; 2187 } 2188 // See if the component type is already loaded. Array classes are 2189 // always associated with the class loader of their underlying 2190 // element type -- an array of Strings goes with the loader for 2191 // java/lang/String -- so we need to look for it there. (The 2192 // caller should have checked for the existence of the class 2193 // before calling here, but they did so with *their* class loader, 2194 // not the component type's loader.) 2195 // 2196 // If we find it, the caller adds "loader" to the class' initiating 2197 // loader list, which should prevent us from going through this again. 2198 // 2199 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2200 // are the same, because our caller (FindClass) just did the 2201 // lookup. (Even if we get this wrong we still have correct behavior, 2202 // because we effectively do this lookup again when we add the new 2203 // class to the hash table --- necessary because of possible races with 2204 // other threads.) 2205 if (class_loader.Get() != component_type->GetClassLoader()) { 2206 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2207 if (new_class != NULL) { 2208 return new_class; 2209 } 2210 } 2211 2212 // Fill out the fields in the Class. 2213 // 2214 // It is possible to execute some methods against arrays, because 2215 // all arrays are subclasses of java_lang_Object_, so we need to set 2216 // up a vtable. We can just point at the one in java_lang_Object_. 2217 // 2218 // Array classes are simple enough that we don't need to do a full 2219 // link step. 2220 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2221 if (UNLIKELY(!init_done_)) { 2222 // Classes that were hand created, ie not by FindSystemClass 2223 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2224 new_class.Assign(GetClassRoot(kClassArrayClass)); 2225 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2226 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2227 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2228 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2229 } else if (strcmp(descriptor, 2230 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2231 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2232 } else if (strcmp(descriptor, 2233 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2234 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2235 } else if (strcmp(descriptor, "[C") == 0) { 2236 new_class.Assign(GetClassRoot(kCharArrayClass)); 2237 } else if (strcmp(descriptor, "[I") == 0) { 2238 new_class.Assign(GetClassRoot(kIntArrayClass)); 2239 } 2240 } 2241 if (new_class.Get() == nullptr) { 2242 new_class.Assign(AllocClass(self, sizeof(mirror::Class))); 2243 if (new_class.Get() == nullptr) { 2244 return nullptr; 2245 } 2246 new_class->SetComponentType(component_type.Get()); 2247 } 2248 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2249 DCHECK(new_class->GetComponentType() != NULL); 2250 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2251 new_class->SetSuperClass(java_lang_Object); 2252 new_class->SetVTable(java_lang_Object->GetVTable()); 2253 new_class->SetPrimitiveType(Primitive::kPrimNot); 2254 new_class->SetClassLoader(component_type->GetClassLoader()); 2255 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2256 // don't need to set new_class->SetObjectSize(..) 2257 // because Object::SizeOf delegates to Array::SizeOf 2258 2259 2260 // All arrays have java/lang/Cloneable and java/io/Serializable as 2261 // interfaces. We need to set that up here, so that stuff like 2262 // "instanceof" works right. 2263 // 2264 // Note: The GC could run during the call to FindSystemClass, 2265 // so we need to make sure the class object is GC-valid while we're in 2266 // there. Do this by clearing the interface list so the GC will just 2267 // think that the entries are null. 2268 2269 2270 // Use the single, global copies of "interfaces" and "iftable" 2271 // (remember not to free them for arrays). 2272 { 2273 mirror::IfTable* array_iftable = 2274 ReadBarrier::BarrierForRoot<mirror::IfTable, kWithReadBarrier>(&array_iftable_); 2275 CHECK(array_iftable != nullptr); 2276 new_class->SetIfTable(array_iftable); 2277 } 2278 2279 // Inherit access flags from the component type. 2280 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2281 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2282 access_flags &= kAccJavaFlagsMask; 2283 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2284 // and remove "interface". 2285 access_flags |= kAccAbstract | kAccFinal; 2286 access_flags &= ~kAccInterface; 2287 2288 new_class->SetAccessFlags(access_flags); 2289 2290 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2291 if (existing == nullptr) { 2292 return new_class.Get(); 2293 } 2294 // Another thread must have loaded the class after we 2295 // started but before we finished. Abandon what we've 2296 // done. 2297 // 2298 // (Yes, this happens.) 2299 2300 return existing; 2301} 2302 2303mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2304 switch (type) { 2305 case 'B': 2306 return GetClassRoot(kPrimitiveByte); 2307 case 'C': 2308 return GetClassRoot(kPrimitiveChar); 2309 case 'D': 2310 return GetClassRoot(kPrimitiveDouble); 2311 case 'F': 2312 return GetClassRoot(kPrimitiveFloat); 2313 case 'I': 2314 return GetClassRoot(kPrimitiveInt); 2315 case 'J': 2316 return GetClassRoot(kPrimitiveLong); 2317 case 'S': 2318 return GetClassRoot(kPrimitiveShort); 2319 case 'Z': 2320 return GetClassRoot(kPrimitiveBoolean); 2321 case 'V': 2322 return GetClassRoot(kPrimitiveVoid); 2323 default: 2324 break; 2325 } 2326 std::string printable_type(PrintableChar(type)); 2327 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2328 return NULL; 2329} 2330 2331mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2332 size_t hash) { 2333 if (VLOG_IS_ON(class_linker)) { 2334 mirror::DexCache* dex_cache = klass->GetDexCache(); 2335 std::string source; 2336 if (dex_cache != NULL) { 2337 source += " from "; 2338 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2339 } 2340 LOG(INFO) << "Loaded class " << descriptor << source; 2341 } 2342 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2343 mirror::Class* existing = 2344 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2345 if (existing != NULL) { 2346 return existing; 2347 } 2348 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2349 // Check a class loaded with the system class loader matches one in the image if the class 2350 // is in the image. 2351 existing = LookupClassFromImage(descriptor); 2352 if (existing != NULL) { 2353 CHECK(klass == existing); 2354 } 2355 } 2356 VerifyObject(klass); 2357 class_table_.insert(std::make_pair(hash, klass)); 2358 if (log_new_class_table_roots_) { 2359 new_class_roots_.push_back(std::make_pair(hash, klass)); 2360 } 2361 return NULL; 2362} 2363 2364bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2365 size_t hash = Hash(descriptor); 2366 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2367 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2368 it != end && it->first == hash; 2369 ++it) { 2370 mirror::Class** root = &it->second; 2371 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2372 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2373 class_table_.erase(it); 2374 return true; 2375 } 2376 } 2377 return false; 2378} 2379 2380mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2381 const mirror::ClassLoader* class_loader) { 2382 size_t hash = Hash(descriptor); 2383 { 2384 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2385 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2386 if (result != NULL) { 2387 return result; 2388 } 2389 } 2390 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2391 return NULL; 2392 } else { 2393 // Lookup failed but need to search dex_caches_. 2394 mirror::Class* result = LookupClassFromImage(descriptor); 2395 if (result != NULL) { 2396 InsertClass(descriptor, result, hash); 2397 } else { 2398 // Searching the image dex files/caches failed, we don't want to get into this situation 2399 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2400 // classes into the class table. 2401 const int32_t kMaxFailedDexCacheLookups = 1000; 2402 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2403 MoveImageClassesToClassTable(); 2404 } 2405 } 2406 return result; 2407 } 2408} 2409 2410mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2411 const mirror::ClassLoader* class_loader, 2412 size_t hash) { 2413 auto end = class_table_.end(); 2414 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2415 mirror::Class** root = &it->second; 2416 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2417 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2418 if (kIsDebugBuild) { 2419 // Check for duplicates in the table. 2420 for (++it; it != end && it->first == hash; ++it) { 2421 mirror::Class** root2 = &it->second; 2422 mirror::Class* klass2 = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root2); 2423 CHECK(!(klass2->GetClassLoader() == class_loader && 2424 klass2->DescriptorEquals(descriptor))) 2425 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2426 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2427 } 2428 } 2429 return klass; 2430 } 2431 } 2432 return NULL; 2433} 2434 2435static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2436 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2437 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2438 CHECK(image != NULL); 2439 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2440 return root->AsObjectArray<mirror::DexCache>(); 2441} 2442 2443void ClassLinker::MoveImageClassesToClassTable() { 2444 Thread* self = Thread::Current(); 2445 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2446 if (!dex_cache_image_class_lookup_required_) { 2447 return; // All dex cache classes are already in the class table. 2448 } 2449 const char* old_no_suspend_cause = 2450 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2451 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2452 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2453 mirror::DexCache* dex_cache = dex_caches->Get(i); 2454 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2455 for (int32_t j = 0; j < types->GetLength(); j++) { 2456 mirror::Class* klass = types->Get(j); 2457 if (klass != NULL) { 2458 DCHECK(klass->GetClassLoader() == NULL); 2459 std::string descriptor = klass->GetDescriptor(); 2460 size_t hash = Hash(descriptor.c_str()); 2461 mirror::Class* existing = LookupClassFromTableLocked(descriptor.c_str(), NULL, hash); 2462 if (existing != NULL) { 2463 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2464 << PrettyClassAndClassLoader(klass); 2465 } else { 2466 class_table_.insert(std::make_pair(hash, klass)); 2467 if (log_new_class_table_roots_) { 2468 new_class_roots_.push_back(std::make_pair(hash, klass)); 2469 } 2470 } 2471 } 2472 } 2473 } 2474 dex_cache_image_class_lookup_required_ = false; 2475 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2476} 2477 2478mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2479 Thread* self = Thread::Current(); 2480 const char* old_no_suspend_cause = 2481 self->StartAssertNoThreadSuspension("Image class lookup"); 2482 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2483 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2484 mirror::DexCache* dex_cache = dex_caches->Get(i); 2485 const DexFile* dex_file = dex_cache->GetDexFile(); 2486 // Try binary searching the string/type index. 2487 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2488 if (string_id != NULL) { 2489 const DexFile::TypeId* type_id = 2490 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2491 if (type_id != NULL) { 2492 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2493 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2494 if (klass != NULL) { 2495 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2496 return klass; 2497 } 2498 } 2499 } 2500 } 2501 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2502 return NULL; 2503} 2504 2505void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2506 result.clear(); 2507 if (dex_cache_image_class_lookup_required_) { 2508 MoveImageClassesToClassTable(); 2509 } 2510 size_t hash = Hash(descriptor); 2511 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2512 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2513 it != end && it->first == hash; ++it) { 2514 mirror::Class** root = &it->second; 2515 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2516 if (klass->DescriptorEquals(descriptor)) { 2517 result.push_back(klass); 2518 } 2519 } 2520} 2521 2522void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 2523 // TODO: assert that the monitor on the Class is held 2524 Thread* self = Thread::Current(); 2525 ObjectLock<mirror::Class> lock(self, klass); 2526 2527 // Don't attempt to re-verify if already sufficiently verified. 2528 if (klass->IsVerified() || 2529 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2530 return; 2531 } 2532 2533 // The class might already be erroneous, for example at compile time if we attempted to verify 2534 // this class as a parent to another. 2535 if (klass->IsErroneous()) { 2536 ThrowEarlierClassFailure(klass.Get()); 2537 return; 2538 } 2539 2540 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2541 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2542 } else { 2543 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2544 << PrettyClass(klass.Get()); 2545 CHECK(!Runtime::Current()->IsCompiler()); 2546 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2547 } 2548 2549 // Skip verification if disabled. 2550 if (!Runtime::Current()->IsVerificationEnabled()) { 2551 klass->SetStatus(mirror::Class::kStatusVerified, self); 2552 return; 2553 } 2554 2555 // Verify super class. 2556 StackHandleScope<2> hs(self); 2557 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 2558 if (super.Get() != NULL) { 2559 // Acquire lock to prevent races on verifying the super class. 2560 ObjectLock<mirror::Class> lock(self, super); 2561 2562 if (!super->IsVerified() && !super->IsErroneous()) { 2563 VerifyClass(super); 2564 } 2565 if (!super->IsCompileTimeVerified()) { 2566 std::string error_msg( 2567 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2568 PrettyDescriptor(klass.Get()).c_str(), 2569 PrettyDescriptor(super.Get()).c_str())); 2570 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2571 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 2572 if (cause.Get() != nullptr) { 2573 self->ClearException(); 2574 } 2575 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2576 if (cause.Get() != nullptr) { 2577 self->GetException(nullptr)->SetCause(cause.Get()); 2578 } 2579 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2580 if (Runtime::Current()->IsCompiler()) { 2581 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2582 } 2583 klass->SetStatus(mirror::Class::kStatusError, self); 2584 return; 2585 } 2586 } 2587 2588 // Try to use verification information from the oat file, otherwise do runtime verification. 2589 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2590 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2591 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 2592 if (oat_file_class_status == mirror::Class::kStatusError) { 2593 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2594 << PrettyDescriptor(klass.Get()) << " in " 2595 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2596 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 2597 PrettyDescriptor(klass.Get()).c_str()); 2598 klass->SetStatus(mirror::Class::kStatusError, self); 2599 return; 2600 } 2601 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2602 std::string error_msg; 2603 if (!preverified) { 2604 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 2605 Runtime::Current()->IsCompiler(), 2606 &error_msg); 2607 } 2608 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2609 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2610 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 2611 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2612 << " because: " << error_msg; 2613 } 2614 self->AssertNoPendingException(); 2615 // Make sure all classes referenced by catch blocks are resolved. 2616 ResolveClassExceptionHandlerTypes(dex_file, klass); 2617 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2618 // Even though there were no verifier failures we need to respect whether the super-class 2619 // was verified or requiring runtime reverification. 2620 if (super.Get() == NULL || super->IsVerified()) { 2621 klass->SetStatus(mirror::Class::kStatusVerified, self); 2622 } else { 2623 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2624 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2625 // Pretend a soft failure occured so that we don't consider the class verified below. 2626 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2627 } 2628 } else { 2629 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2630 // Soft failures at compile time should be retried at runtime. Soft 2631 // failures at runtime will be handled by slow paths in the generated 2632 // code. Set status accordingly. 2633 if (Runtime::Current()->IsCompiler()) { 2634 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2635 } else { 2636 klass->SetStatus(mirror::Class::kStatusVerified, self); 2637 } 2638 } 2639 } else { 2640 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 2641 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2642 << " because: " << error_msg; 2643 self->AssertNoPendingException(); 2644 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2645 klass->SetStatus(mirror::Class::kStatusError, self); 2646 } 2647 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2648 // Class is verified so we don't need to do any access check on its methods. 2649 // Let the interpreter know it by setting the kAccPreverified flag onto each 2650 // method. 2651 // Note: we're going here during compilation and at runtime. When we set the 2652 // kAccPreverified flag when compiling image classes, the flag is recorded 2653 // in the image and is set when loading the image. 2654 klass->SetPreverifiedFlagOnAllMethods(); 2655 } 2656} 2657 2658bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2659 mirror::Class::Status& oat_file_class_status) { 2660 // If we're compiling, we can only verify the class using the oat file if 2661 // we are not compiling the image or if the class we're verifying is not part of 2662 // the app. In other words, we will only check for preverification of bootclasspath 2663 // classes. 2664 if (Runtime::Current()->IsCompiler()) { 2665 // Are we compiling the bootclasspath? 2666 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2667 return false; 2668 } 2669 // We are compiling an app (not the image). 2670 2671 // Is this an app class? (I.e. not a bootclasspath class) 2672 if (klass->GetClassLoader() != NULL) { 2673 return false; 2674 } 2675 } 2676 2677 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2678 // Make this work with gtests, which do not set up the image properly. 2679 // TODO: we should clean up gtests to set up the image path properly. 2680 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2681 return false; 2682 } 2683 2684 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2685 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2686 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2687 &dex_location_checksum); 2688 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2689 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2690 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 2691 if (oat_file_class_status == mirror::Class::kStatusVerified || 2692 oat_file_class_status == mirror::Class::kStatusInitialized) { 2693 return true; 2694 } 2695 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2696 // Compile time verification failed with a soft error. Compile time verification can fail 2697 // because we have incomplete type information. Consider the following: 2698 // class ... { 2699 // Foo x; 2700 // .... () { 2701 // if (...) { 2702 // v1 gets assigned a type of resolved class Foo 2703 // } else { 2704 // v1 gets assigned a type of unresolved class Bar 2705 // } 2706 // iput x = v1 2707 // } } 2708 // when we merge v1 following the if-the-else it results in Conflict 2709 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2710 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2711 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2712 // at compile time). 2713 return false; 2714 } 2715 if (oat_file_class_status == mirror::Class::kStatusError) { 2716 // Compile time verification failed with a hard error. This is caused by invalid instructions 2717 // in the class. These errors are unrecoverable. 2718 return false; 2719 } 2720 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2721 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2722 // not loading the class. 2723 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2724 // isn't a problem and this case shouldn't occur 2725 return false; 2726 } 2727 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2728 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2729 << klass->GetDescriptor(); 2730 2731 return false; 2732} 2733 2734void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2735 Handle<mirror::Class> klass) { 2736 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2737 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2738 } 2739 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2740 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2741 } 2742} 2743 2744void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2745 mirror::ArtMethod* method) { 2746 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2747 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2748 if (code_item == NULL) { 2749 return; // native or abstract method 2750 } 2751 if (code_item->tries_size_ == 0) { 2752 return; // nothing to process 2753 } 2754 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2755 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2756 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2757 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2758 CatchHandlerIterator iterator(handlers_ptr); 2759 for (; iterator.HasNext(); iterator.Next()) { 2760 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2761 // unresolved exception types will be ignored by exception delivery 2762 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2763 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2764 if (exception_type == NULL) { 2765 DCHECK(Thread::Current()->IsExceptionPending()); 2766 Thread::Current()->ClearException(); 2767 } 2768 } 2769 } 2770 handlers_ptr = iterator.EndDataPointer(); 2771 } 2772} 2773 2774static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2775static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 2776 Handle<mirror::ArtMethod> prototype); 2777 2778mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 2779 jobjectArray interfaces, jobject loader, 2780 jobjectArray methods, jobjectArray throws) { 2781 Thread* self = soa.Self(); 2782 StackHandleScope<8> hs(self); 2783 Handle<mirror::Class> klass(hs.NewHandle(AllocClass(self, GetClassRoot(kJavaLangClass), 2784 sizeof(mirror::SynthesizedProxyClass)))); 2785 if (klass.Get() == NULL) { 2786 CHECK(self->IsExceptionPending()); // OOME. 2787 return NULL; 2788 } 2789 DCHECK(klass->GetClass() != NULL); 2790 klass->SetObjectSize(sizeof(mirror::Proxy)); 2791 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2792 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2793 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2794 klass->SetName(soa.Decode<mirror::String*>(name)); 2795 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2796 klass->SetDexCache(proxy_class->GetDexCache()); 2797 klass->SetStatus(mirror::Class::kStatusIdx, self); 2798 2799 // Instance fields are inherited, but we add a couple of static fields... 2800 { 2801 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2802 if (UNLIKELY(sfields == NULL)) { 2803 CHECK(self->IsExceptionPending()); // OOME. 2804 return NULL; 2805 } 2806 klass->SetSFields(sfields); 2807 } 2808 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2809 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2810 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 2811 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 2812 CHECK(self->IsExceptionPending()); // OOME. 2813 return nullptr; 2814 } 2815 klass->SetStaticField(0, interfaces_sfield.Get()); 2816 interfaces_sfield->SetDexFieldIndex(0); 2817 interfaces_sfield->SetDeclaringClass(klass.Get()); 2818 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2819 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2820 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 2821 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 2822 CHECK(self->IsExceptionPending()); // OOME. 2823 return nullptr; 2824 } 2825 klass->SetStaticField(1, throws_sfield.Get()); 2826 throws_sfield->SetDexFieldIndex(1); 2827 throws_sfield->SetDeclaringClass(klass.Get()); 2828 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2829 2830 // Proxies have 1 direct method, the constructor 2831 { 2832 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 2833 if (UNLIKELY(directs == nullptr)) { 2834 CHECK(self->IsExceptionPending()); // OOME. 2835 return nullptr; 2836 } 2837 klass->SetDirectMethods(directs); 2838 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2839 if (UNLIKELY(constructor == nullptr)) { 2840 CHECK(self->IsExceptionPending()); // OOME. 2841 return nullptr; 2842 } 2843 klass->SetDirectMethod(0, constructor); 2844 } 2845 2846 // Create virtual method using specified prototypes. 2847 size_t num_virtual_methods = 2848 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 2849 { 2850 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 2851 num_virtual_methods); 2852 if (UNLIKELY(virtuals == NULL)) { 2853 CHECK(self->IsExceptionPending()); // OOME. 2854 return NULL; 2855 } 2856 klass->SetVirtualMethods(virtuals); 2857 } 2858 for (size_t i = 0; i < num_virtual_methods; ++i) { 2859 StackHandleScope<1> hs(self); 2860 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2861 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2862 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 2863 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2864 if (UNLIKELY(clone == nullptr)) { 2865 CHECK(self->IsExceptionPending()); // OOME. 2866 return nullptr; 2867 } 2868 klass->SetVirtualMethod(i, clone); 2869 } 2870 2871 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2872 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 2873 self->AssertNoPendingException(); 2874 2875 { 2876 ObjectLock<mirror::Class> lock(self, klass); // Must hold lock on object when resolved. 2877 // Link the fields and virtual methods, creating vtable and iftables 2878 Handle<mirror::ObjectArray<mirror::Class>> h_interfaces( 2879 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 2880 if (!LinkClass(self, klass, h_interfaces)) { 2881 klass->SetStatus(mirror::Class::kStatusError, self); 2882 return nullptr; 2883 } 2884 2885 interfaces_sfield->SetObject<false>( 2886 klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2887 throws_sfield->SetObject<false>( 2888 klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 2889 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2890 } 2891 2892 // sanity checks 2893 if (kIsDebugBuild) { 2894 CHECK(klass->GetIFields() == nullptr); 2895 CheckProxyConstructor(klass->GetDirectMethod(0)); 2896 for (size_t i = 0; i < num_virtual_methods; ++i) { 2897 StackHandleScope<2> hs(self); 2898 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2899 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2900 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 2901 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 2902 CheckProxyMethod(virtual_method, prototype); 2903 } 2904 2905 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 2906 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2907 decoded_name->ToModifiedUtf8().c_str())); 2908 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2909 2910 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2911 decoded_name->ToModifiedUtf8().c_str())); 2912 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2913 2914 mirror::SynthesizedProxyClass* synth_proxy_class = 2915 down_cast<mirror::SynthesizedProxyClass*>(klass.Get()); 2916 CHECK_EQ(synth_proxy_class->GetInterfaces(), 2917 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2918 CHECK_EQ(synth_proxy_class->GetThrows(), 2919 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 2920 } 2921 std::string descriptor(GetDescriptorForProxy(klass.Get())); 2922 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 2923 CHECK(existing == nullptr); 2924 return klass.Get(); 2925} 2926 2927std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 2928 DCHECK(proxy_class->IsProxyClass()); 2929 mirror::String* name = proxy_class->GetName(); 2930 DCHECK(name != NULL); 2931 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2932} 2933 2934mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 2935 mirror::ArtMethod* proxy_method) { 2936 DCHECK(proxy_class->IsProxyClass()); 2937 DCHECK(proxy_method->IsProxyMethod()); 2938 // Locate the dex cache of the original interface/Object 2939 mirror::DexCache* dex_cache = NULL; 2940 { 2941 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2942 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2943 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2944 mirror::DexCache* a_dex_cache = GetDexCache(i); 2945 if (a_dex_cache->GetResolvedTypes() == resolved_types) { 2946 dex_cache = a_dex_cache; 2947 break; 2948 } 2949 } 2950 } 2951 CHECK(dex_cache != NULL); 2952 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2953 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2954 CHECK(resolved_method != NULL); 2955 return resolved_method; 2956} 2957 2958 2959mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2960 Handle<mirror::Class> klass, 2961 mirror::Class* proxy_class) { 2962 // Create constructor for Proxy that must initialize h 2963 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2964 proxy_class->GetDirectMethods(); 2965 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2966 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2967 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2968 // code_ too) 2969 mirror::ArtMethod* constructor = 2970 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2971 if (constructor == NULL) { 2972 CHECK(self->IsExceptionPending()); // OOME. 2973 return NULL; 2974 } 2975 // Make this constructor public and fix the class to be our Proxy version 2976 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2977 constructor->SetDeclaringClass(klass.Get()); 2978 return constructor; 2979} 2980 2981static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2982 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2983 CHECK(constructor->IsConstructor()); 2984 CHECK_STREQ(constructor->GetName(), "<init>"); 2985 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 2986 "(Ljava/lang/reflect/InvocationHandler;)V"); 2987 DCHECK(constructor->IsPublic()); 2988} 2989 2990mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 2991 Handle<mirror::Class> klass, 2992 Handle<mirror::ArtMethod> prototype) { 2993 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2994 // prototype method 2995 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2996 prototype.Get()); 2997 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2998 // as necessary 2999 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3000 if (UNLIKELY(method == NULL)) { 3001 CHECK(self->IsExceptionPending()); // OOME. 3002 return NULL; 3003 } 3004 3005 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3006 // the intersection of throw exceptions as defined in Proxy 3007 method->SetDeclaringClass(klass.Get()); 3008 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3009 3010 // At runtime the method looks like a reference and argument saving method, clone the code 3011 // related parameters from this method. 3012 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3013 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3014 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3015 3016 return method; 3017} 3018 3019static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3020 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3021 // Basic sanity 3022 CHECK(!prototype->IsFinal()); 3023 CHECK(method->IsFinal()); 3024 CHECK(!method->IsAbstract()); 3025 3026 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3027 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3028 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3029 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 3030 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 3031 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3032 3033 MethodHelper mh(method); 3034 MethodHelper mh2(prototype); 3035 CHECK_STREQ(method->GetName(), prototype->GetName()); 3036 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3037 // More complex sanity - via dex cache 3038 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3039} 3040 3041static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3042 bool can_init_parents) 3043 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3044 if (can_init_statics && can_init_parents) { 3045 return true; 3046 } 3047 if (!can_init_statics) { 3048 // Check if there's a class initializer. 3049 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3050 if (clinit != NULL) { 3051 return false; 3052 } 3053 // Check if there are encoded static values needing initialization. 3054 if (klass->NumStaticFields() != 0) { 3055 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3056 DCHECK(dex_class_def != NULL); 3057 if (dex_class_def->static_values_off_ != 0) { 3058 return false; 3059 } 3060 } 3061 } 3062 if (!klass->IsInterface() && klass->HasSuperClass()) { 3063 mirror::Class* super_class = klass->GetSuperClass(); 3064 if (!can_init_parents && !super_class->IsInitialized()) { 3065 return false; 3066 } else { 3067 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3068 return false; 3069 } 3070 } 3071 } 3072 return true; 3073} 3074 3075bool ClassLinker::IsInitialized() const { 3076 return init_done_; 3077} 3078 3079bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3080 bool can_init_parents) { 3081 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3082 3083 // Are we already initialized and therefore done? 3084 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3085 // an initialized class will never change its state. 3086 if (klass->IsInitialized()) { 3087 return true; 3088 } 3089 3090 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3091 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3092 return false; 3093 } 3094 3095 Thread* self = Thread::Current(); 3096 uint64_t t0; 3097 { 3098 ObjectLock<mirror::Class> lock(self, klass); 3099 3100 // Re-check under the lock in case another thread initialized ahead of us. 3101 if (klass->IsInitialized()) { 3102 return true; 3103 } 3104 3105 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3106 if (klass->IsErroneous()) { 3107 ThrowEarlierClassFailure(klass.Get()); 3108 return false; 3109 } 3110 3111 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3112 3113 if (!klass->IsVerified()) { 3114 VerifyClass(klass); 3115 if (!klass->IsVerified()) { 3116 // We failed to verify, expect either the klass to be erroneous or verification failed at 3117 // compile time. 3118 if (klass->IsErroneous()) { 3119 CHECK(self->IsExceptionPending()); 3120 } else { 3121 CHECK(Runtime::Current()->IsCompiler()); 3122 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3123 } 3124 return false; 3125 } 3126 } 3127 3128 // If the class is kStatusInitializing, either this thread is 3129 // initializing higher up the stack or another thread has beat us 3130 // to initializing and we need to wait. Either way, this 3131 // invocation of InitializeClass will not be responsible for 3132 // running <clinit> and will return. 3133 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3134 // We caught somebody else in the act; was it us? 3135 if (klass->GetClinitThreadId() == self->GetTid()) { 3136 // Yes. That's fine. Return so we can continue initializing. 3137 return true; 3138 } 3139 // No. That's fine. Wait for another thread to finish initializing. 3140 return WaitForInitializeClass(klass, self, lock); 3141 } 3142 3143 if (!ValidateSuperClassDescriptors(klass)) { 3144 klass->SetStatus(mirror::Class::kStatusError, self); 3145 return false; 3146 } 3147 3148 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3149 3150 // From here out other threads may observe that we're initializing and so changes of state 3151 // require the a notification. 3152 klass->SetClinitThreadId(self->GetTid()); 3153 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3154 3155 t0 = NanoTime(); 3156 } 3157 3158 // Initialize super classes, must be done while initializing for the JLS. 3159 if (!klass->IsInterface() && klass->HasSuperClass()) { 3160 mirror::Class* super_class = klass->GetSuperClass(); 3161 if (!super_class->IsInitialized()) { 3162 CHECK(!super_class->IsInterface()); 3163 CHECK(can_init_parents); 3164 StackHandleScope<1> hs(self); 3165 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3166 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3167 if (!super_initialized) { 3168 // The super class was verified ahead of entering initializing, we should only be here if 3169 // the super class became erroneous due to initialization. 3170 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3171 << "Super class initialization failed for " 3172 << PrettyDescriptor(handle_scope_super.Get()) 3173 << " that has unexpected status " << handle_scope_super->GetStatus() 3174 << "\nPending exception:\n" 3175 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3176 ObjectLock<mirror::Class> lock(self, klass); 3177 // Initialization failed because the super-class is erroneous. 3178 klass->SetStatus(mirror::Class::kStatusError, self); 3179 return false; 3180 } 3181 } 3182 } 3183 3184 if (klass->NumStaticFields() > 0) { 3185 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3186 CHECK(dex_class_def != NULL); 3187 const DexFile& dex_file = klass->GetDexFile(); 3188 StackHandleScope<2> hs(self); 3189 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3190 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3191 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3192 this, *dex_class_def); 3193 if (it.HasNext()) { 3194 CHECK(can_init_statics); 3195 // We reordered the fields, so we need to be able to map the 3196 // field indexes to the right fields. 3197 SafeMap<uint32_t, mirror::ArtField*> field_map; 3198 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3199 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3200 if (Runtime::Current()->IsActiveTransaction()) { 3201 it.ReadValueToField<true>(field_map.Get(i)); 3202 } else { 3203 it.ReadValueToField<false>(field_map.Get(i)); 3204 } 3205 } 3206 } 3207 } 3208 3209 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3210 if (clinit != NULL) { 3211 CHECK(can_init_statics); 3212 JValue result; 3213 clinit->Invoke(self, NULL, 0, &result, "V"); 3214 } 3215 3216 uint64_t t1 = NanoTime(); 3217 3218 bool success = true; 3219 { 3220 ObjectLock<mirror::Class> lock(self, klass); 3221 3222 if (self->IsExceptionPending()) { 3223 WrapExceptionInInitializer(); 3224 klass->SetStatus(mirror::Class::kStatusError, self); 3225 success = false; 3226 } else { 3227 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3228 RuntimeStats* thread_stats = self->GetStats(); 3229 ++global_stats->class_init_count; 3230 ++thread_stats->class_init_count; 3231 global_stats->class_init_time_ns += (t1 - t0); 3232 thread_stats->class_init_time_ns += (t1 - t0); 3233 // Set the class as initialized except if failed to initialize static fields. 3234 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3235 if (VLOG_IS_ON(class_linker)) { 3236 LOG(INFO) << "Initialized class " << klass->GetDescriptor() << " from " << 3237 klass->GetLocation(); 3238 } 3239 // Opportunistically set static method trampolines to their destination. 3240 FixupStaticTrampolines(klass.Get()); 3241 } 3242 } 3243 return success; 3244} 3245 3246bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3247 ObjectLock<mirror::Class>& lock) 3248 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3249 while (true) { 3250 self->AssertNoPendingException(); 3251 CHECK(!klass->IsInitialized()); 3252 lock.WaitIgnoringInterrupts(); 3253 3254 // When we wake up, repeat the test for init-in-progress. If 3255 // there's an exception pending (only possible if 3256 // "interruptShouldThrow" was set), bail out. 3257 if (self->IsExceptionPending()) { 3258 WrapExceptionInInitializer(); 3259 klass->SetStatus(mirror::Class::kStatusError, self); 3260 return false; 3261 } 3262 // Spurious wakeup? Go back to waiting. 3263 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3264 continue; 3265 } 3266 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3267 // Compile time initialization failed. 3268 return false; 3269 } 3270 if (klass->IsErroneous()) { 3271 // The caller wants an exception, but it was thrown in a 3272 // different thread. Synthesize one here. 3273 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3274 PrettyDescriptor(klass.Get()).c_str()); 3275 return false; 3276 } 3277 if (klass->IsInitialized()) { 3278 return true; 3279 } 3280 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 3281 << klass->GetStatus(); 3282 } 3283 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 3284} 3285 3286bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 3287 if (klass->IsInterface()) { 3288 return true; 3289 } 3290 // Begin with the methods local to the superclass. 3291 StackHandleScope<2> hs(Thread::Current()); 3292 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3293 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3294 if (klass->HasSuperClass() && 3295 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3296 for (int i = klass->GetSuperClass()->GetVTable()->GetLength() - 1; i >= 0; --i) { 3297 mh.ChangeMethod(klass->GetVTable()->GetWithoutChecks(i)); 3298 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTable()->GetWithoutChecks(i)); 3299 if (mh.GetMethod() != super_mh.GetMethod() && 3300 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3301 ThrowLinkageError(klass.Get(), 3302 "Class %s method %s resolves differently in superclass %s", 3303 PrettyDescriptor(klass.Get()).c_str(), 3304 PrettyMethod(mh.GetMethod()).c_str(), 3305 PrettyDescriptor(klass->GetSuperClass()).c_str()); 3306 return false; 3307 } 3308 } 3309 } 3310 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3311 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 3312 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 3313 for (uint32_t j = 0; j < num_methods; ++j) { 3314 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 3315 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 3316 if (mh.GetMethod() != super_mh.GetMethod() && 3317 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3318 ThrowLinkageError(klass.Get(), 3319 "Class %s method %s resolves differently in interface %s", 3320 PrettyDescriptor(klass.Get()).c_str(), 3321 PrettyMethod(mh.GetMethod()).c_str(), 3322 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 3323 return false; 3324 } 3325 } 3326 } 3327 } 3328 return true; 3329} 3330 3331bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 3332 bool can_init_parents) { 3333 DCHECK(c.Get() != nullptr); 3334 const bool success = c->IsInitialized() || InitializeClass(c, can_init_fields, can_init_parents); 3335 if (!success && can_init_fields && can_init_parents) { 3336 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.Get()); 3337 } 3338 return success; 3339} 3340 3341void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3342 mirror::Class* c, 3343 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3344 const byte* class_data = dex_file.GetClassData(dex_class_def); 3345 ClassDataItemIterator it(dex_file, class_data); 3346 StackHandleScope<2> hs(Thread::Current()); 3347 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 3348 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 3349 CHECK(!kMovingFields); 3350 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3351 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3352 } 3353} 3354 3355bool ClassLinker::LinkClass(Thread* self, Handle<mirror::Class> klass, 3356 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3357 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3358 if (!LinkSuperClass(klass)) { 3359 return false; 3360 } 3361 if (!LinkMethods(self, klass, interfaces)) { 3362 return false; 3363 } 3364 if (!LinkInstanceFields(klass)) { 3365 return false; 3366 } 3367 if (!LinkStaticFields(klass)) { 3368 return false; 3369 } 3370 CreateReferenceInstanceOffsets(klass); 3371 CreateReferenceStaticOffsets(klass); 3372 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3373 klass->SetStatus(mirror::Class::kStatusResolved, self); 3374 return true; 3375} 3376 3377bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 3378 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3379 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3380 uint16_t super_class_idx = class_def.superclass_idx_; 3381 if (super_class_idx != DexFile::kDexNoIndex16) { 3382 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 3383 if (super_class == NULL) { 3384 DCHECK(Thread::Current()->IsExceptionPending()); 3385 return false; 3386 } 3387 // Verify 3388 if (!klass->CanAccess(super_class)) { 3389 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 3390 PrettyDescriptor(super_class).c_str(), 3391 PrettyDescriptor(klass.Get()).c_str()); 3392 return false; 3393 } 3394 klass->SetSuperClass(super_class); 3395 } 3396 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3397 if (interfaces != NULL) { 3398 for (size_t i = 0; i < interfaces->Size(); i++) { 3399 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3400 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 3401 if (interface == NULL) { 3402 DCHECK(Thread::Current()->IsExceptionPending()); 3403 return false; 3404 } 3405 // Verify 3406 if (!klass->CanAccess(interface)) { 3407 // TODO: the RI seemed to ignore this in my testing. 3408 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 3409 PrettyDescriptor(interface).c_str(), 3410 PrettyDescriptor(klass.Get()).c_str()); 3411 return false; 3412 } 3413 } 3414 } 3415 // Mark the class as loaded. 3416 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3417 return true; 3418} 3419 3420bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 3421 CHECK(!klass->IsPrimitive()); 3422 mirror::Class* super = klass->GetSuperClass(); 3423 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 3424 if (super != NULL) { 3425 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 3426 return false; 3427 } 3428 return true; 3429 } 3430 if (super == NULL) { 3431 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 3432 PrettyDescriptor(klass.Get()).c_str()); 3433 return false; 3434 } 3435 // Verify 3436 if (super->IsFinal() || super->IsInterface()) { 3437 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 3438 PrettyDescriptor(super).c_str(), 3439 PrettyDescriptor(klass.Get()).c_str(), 3440 super->IsFinal() ? "declared final" : "an interface"); 3441 return false; 3442 } 3443 if (!klass->CanAccess(super)) { 3444 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 3445 PrettyDescriptor(super).c_str(), 3446 PrettyDescriptor(klass.Get()).c_str()); 3447 return false; 3448 } 3449 3450 // Inherit kAccClassIsFinalizable from the superclass in case this 3451 // class doesn't override finalize. 3452 if (super->IsFinalizable()) { 3453 klass->SetFinalizable(); 3454 } 3455 3456 // Inherit reference flags (if any) from the superclass. 3457 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3458 if (reference_flags != 0) { 3459 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3460 } 3461 // Disallow custom direct subclasses of java.lang.ref.Reference. 3462 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3463 ThrowLinkageError(klass.Get(), 3464 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3465 PrettyDescriptor(klass.Get()).c_str()); 3466 return false; 3467 } 3468 3469 if (kIsDebugBuild) { 3470 // Ensure super classes are fully resolved prior to resolving fields.. 3471 while (super != NULL) { 3472 CHECK(super->IsResolved()); 3473 super = super->GetSuperClass(); 3474 } 3475 } 3476 return true; 3477} 3478 3479// Populate the class vtable and itable. Compute return type indices. 3480bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 3481 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3482 if (klass->IsInterface()) { 3483 // No vtable. 3484 size_t count = klass->NumVirtualMethods(); 3485 if (!IsUint(16, count)) { 3486 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 3487 return false; 3488 } 3489 for (size_t i = 0; i < count; ++i) { 3490 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3491 } 3492 // Link interface method tables 3493 return LinkInterfaceMethods(klass, interfaces); 3494 } else { 3495 // Link virtual and interface method tables 3496 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 3497 } 3498 return true; 3499} 3500 3501bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 3502 if (klass->HasSuperClass()) { 3503 uint32_t max_count = klass->NumVirtualMethods() + 3504 klass->GetSuperClass()->GetVTable()->GetLength(); 3505 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3506 CHECK_LE(actual_count, max_count); 3507 // TODO: do not assign to the vtable field until it is fully constructed. 3508 StackHandleScope<3> hs(self); 3509 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3510 hs.NewHandle(klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count))); 3511 if (UNLIKELY(vtable.Get() == NULL)) { 3512 CHECK(self->IsExceptionPending()); // OOME. 3513 return false; 3514 } 3515 // See if any of our virtual methods override the superclass. 3516 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3517 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3518 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3519 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3520 local_mh.ChangeMethod(local_method); 3521 size_t j = 0; 3522 for (; j < actual_count; ++j) { 3523 mirror::ArtMethod* super_method = vtable->Get(j); 3524 super_mh.ChangeMethod(super_method); 3525 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3526 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 3527 super_method->GetAccessFlags())) { 3528 if (super_method->IsFinal()) { 3529 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 3530 PrettyMethod(local_method).c_str(), 3531 super_method->GetDeclaringClassDescriptor()); 3532 return false; 3533 } 3534 vtable->Set<false>(j, local_method); 3535 local_method->SetMethodIndex(j); 3536 break; 3537 } else { 3538 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3539 << " would have incorrectly overridden the package-private method in " 3540 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 3541 } 3542 } 3543 } 3544 if (j == actual_count) { 3545 // Not overriding, append. 3546 vtable->Set<false>(actual_count, local_method); 3547 local_method->SetMethodIndex(actual_count); 3548 actual_count += 1; 3549 } 3550 } 3551 if (!IsUint(16, actual_count)) { 3552 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 3553 return false; 3554 } 3555 // Shrink vtable if possible 3556 CHECK_LE(actual_count, max_count); 3557 if (actual_count < max_count) { 3558 vtable.Assign(vtable->CopyOf(self, actual_count)); 3559 if (UNLIKELY(vtable.Get() == NULL)) { 3560 CHECK(self->IsExceptionPending()); // OOME. 3561 return false; 3562 } 3563 } 3564 klass->SetVTable(vtable.Get()); 3565 } else { 3566 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 3567 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3568 if (!IsUint(16, num_virtual_methods)) { 3569 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 3570 return false; 3571 } 3572 StackHandleScope<1> hs(self); 3573 Handle<mirror::ObjectArray<mirror::ArtMethod>> 3574 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 3575 if (UNLIKELY(vtable.Get() == NULL)) { 3576 CHECK(self->IsExceptionPending()); // OOME. 3577 return false; 3578 } 3579 for (size_t i = 0; i < num_virtual_methods; ++i) { 3580 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3581 vtable->Set<false>(i, virtual_method); 3582 virtual_method->SetMethodIndex(i & 0xFFFF); 3583 } 3584 klass->SetVTable(vtable.Get()); 3585 } 3586 return true; 3587} 3588 3589bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 3590 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3591 Thread* const self = Thread::Current(); 3592 Runtime* const runtime = Runtime::Current(); 3593 // Set the imt table to be all conflicts by default. 3594 klass->SetImTable(runtime->GetDefaultImt()); 3595 size_t super_ifcount; 3596 if (klass->HasSuperClass()) { 3597 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3598 } else { 3599 super_ifcount = 0; 3600 } 3601 uint32_t num_interfaces = 3602 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 3603 size_t ifcount = super_ifcount + num_interfaces; 3604 for (size_t i = 0; i < num_interfaces; i++) { 3605 mirror::Class* interface = 3606 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 3607 interfaces->Get(i); 3608 ifcount += interface->GetIfTableCount(); 3609 } 3610 if (ifcount == 0) { 3611 // Class implements no interfaces. 3612 DCHECK_EQ(klass->GetIfTableCount(), 0); 3613 DCHECK(klass->GetIfTable() == NULL); 3614 return true; 3615 } 3616 if (ifcount == super_ifcount) { 3617 // Class implements same interfaces as parent, are any of these not marker interfaces? 3618 bool has_non_marker_interface = false; 3619 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3620 for (size_t i = 0; i < ifcount; ++i) { 3621 if (super_iftable->GetMethodArrayCount(i) > 0) { 3622 has_non_marker_interface = true; 3623 break; 3624 } 3625 } 3626 if (!has_non_marker_interface) { 3627 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3628 klass->SetIfTable(super_iftable); 3629 return true; 3630 } 3631 } 3632 StackHandleScope<4> hs(self); 3633 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 3634 if (UNLIKELY(iftable.Get() == NULL)) { 3635 CHECK(self->IsExceptionPending()); // OOME. 3636 return false; 3637 } 3638 if (super_ifcount != 0) { 3639 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3640 for (size_t i = 0; i < super_ifcount; i++) { 3641 mirror::Class* super_interface = super_iftable->GetInterface(i); 3642 iftable->SetInterface(i, super_interface); 3643 } 3644 } 3645 // Flatten the interface inheritance hierarchy. 3646 size_t idx = super_ifcount; 3647 for (size_t i = 0; i < num_interfaces; i++) { 3648 mirror::Class* interface = 3649 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 3650 interfaces->Get(i); 3651 DCHECK(interface != NULL); 3652 if (!interface->IsInterface()) { 3653 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 3654 PrettyDescriptor(klass.Get()).c_str(), 3655 PrettyDescriptor(interface->GetDescriptor()).c_str()); 3656 return false; 3657 } 3658 // Check if interface is already in iftable 3659 bool duplicate = false; 3660 for (size_t j = 0; j < idx; j++) { 3661 mirror::Class* existing_interface = iftable->GetInterface(j); 3662 if (existing_interface == interface) { 3663 duplicate = true; 3664 break; 3665 } 3666 } 3667 if (!duplicate) { 3668 // Add this non-duplicate interface. 3669 iftable->SetInterface(idx++, interface); 3670 // Add this interface's non-duplicate super-interfaces. 3671 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3672 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3673 bool super_duplicate = false; 3674 for (size_t k = 0; k < idx; k++) { 3675 mirror::Class* existing_interface = iftable->GetInterface(k); 3676 if (existing_interface == super_interface) { 3677 super_duplicate = true; 3678 break; 3679 } 3680 } 3681 if (!super_duplicate) { 3682 iftable->SetInterface(idx++, super_interface); 3683 } 3684 } 3685 } 3686 } 3687 // Shrink iftable in case duplicates were found 3688 if (idx < ifcount) { 3689 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3690 if (UNLIKELY(iftable.Get() == NULL)) { 3691 CHECK(self->IsExceptionPending()); // OOME. 3692 return false; 3693 } 3694 ifcount = idx; 3695 } else { 3696 CHECK_EQ(idx, ifcount); 3697 } 3698 klass->SetIfTable(iftable.Get()); 3699 3700 // If we're an interface, we don't need the vtable pointers, so we're done. 3701 if (klass->IsInterface()) { 3702 return true; 3703 } 3704 // Allocate imtable 3705 bool imtable_changed = false; 3706 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 3707 hs.NewHandle(AllocArtMethodArray(self, kImtSize))); 3708 if (UNLIKELY(imtable.Get() == NULL)) { 3709 CHECK(self->IsExceptionPending()); // OOME. 3710 return false; 3711 } 3712 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3713 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3714 std::vector<mirror::ArtMethod*> miranda_list; 3715 for (size_t i = 0; i < ifcount; ++i) { 3716 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 3717 if (num_methods > 0) { 3718 StackHandleScope<2> hs(self); 3719 Handle<mirror::ObjectArray<mirror::ArtMethod>> 3720 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 3721 if (UNLIKELY(method_array.Get() == nullptr)) { 3722 CHECK(self->IsExceptionPending()); // OOME. 3723 return false; 3724 } 3725 iftable->SetMethodArray(i, method_array.Get()); 3726 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3727 hs.NewHandle(klass->GetVTableDuringLinking())); 3728 for (size_t j = 0; j < num_methods; ++j) { 3729 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 3730 interface_mh.ChangeMethod(interface_method); 3731 int32_t k; 3732 // For each method listed in the interface's method list, find the 3733 // matching method in our class's method list. We want to favor the 3734 // subclass over the superclass, which just requires walking 3735 // back from the end of the vtable. (This only matters if the 3736 // superclass defines a private method and this class redefines 3737 // it -- otherwise it would use the same vtable slot. In .dex files 3738 // those don't end up in the virtual method table, so it shouldn't 3739 // matter which direction we go. We walk it backward anyway.) 3740 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3741 mirror::ArtMethod* vtable_method = vtable->Get(k); 3742 vtable_mh.ChangeMethod(vtable_method); 3743 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3744 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3745 ThrowIllegalAccessError( 3746 klass.Get(), 3747 "Method '%s' implementing interface method '%s' is not public", 3748 PrettyMethod(vtable_method).c_str(), 3749 PrettyMethod(interface_method).c_str()); 3750 return false; 3751 } 3752 method_array->Set<false>(j, vtable_method); 3753 // Place method in imt if entry is empty, place conflict otherwise. 3754 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3755 if (imtable->Get(imt_index) == NULL) { 3756 imtable->Set<false>(imt_index, vtable_method); 3757 imtable_changed = true; 3758 } else { 3759 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 3760 } 3761 break; 3762 } 3763 } 3764 if (k < 0) { 3765 StackHandleScope<1> hs(self); 3766 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 3767 for (mirror::ArtMethod* mir_method : miranda_list) { 3768 vtable_mh.ChangeMethod(mir_method); 3769 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3770 miranda_method.Assign(mir_method); 3771 break; 3772 } 3773 } 3774 if (miranda_method.Get() == NULL) { 3775 // Point the interface table at a phantom slot. 3776 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3777 if (UNLIKELY(miranda_method.Get() == NULL)) { 3778 CHECK(self->IsExceptionPending()); // OOME. 3779 return false; 3780 } 3781 // TODO: If a methods move then the miranda_list may hold stale references. 3782 miranda_list.push_back(miranda_method.Get()); 3783 } 3784 method_array->Set<false>(j, miranda_method.Get()); 3785 } 3786 } 3787 } 3788 } 3789 if (imtable_changed) { 3790 // Fill in empty entries in interface method table with conflict. 3791 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 3792 for (size_t i = 0; i < kImtSize; i++) { 3793 if (imtable->Get(i) == NULL) { 3794 imtable->Set<false>(i, imt_conflict_method); 3795 } 3796 } 3797 klass->SetImTable(imtable.Get()); 3798 } 3799 if (!miranda_list.empty()) { 3800 int old_method_count = klass->NumVirtualMethods(); 3801 int new_method_count = old_method_count + miranda_list.size(); 3802 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3803 if (old_method_count == 0) { 3804 virtuals = AllocArtMethodArray(self, new_method_count); 3805 } else { 3806 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3807 } 3808 if (UNLIKELY(virtuals == NULL)) { 3809 CHECK(self->IsExceptionPending()); // OOME. 3810 return false; 3811 } 3812 klass->SetVirtualMethods(virtuals); 3813 3814 StackHandleScope<1> hs(self); 3815 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3816 hs.NewHandle(klass->GetVTableDuringLinking())); 3817 CHECK(vtable.Get() != NULL); 3818 int old_vtable_count = vtable->GetLength(); 3819 int new_vtable_count = old_vtable_count + miranda_list.size(); 3820 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 3821 if (UNLIKELY(vtable.Get() == NULL)) { 3822 CHECK(self->IsExceptionPending()); // OOME. 3823 return false; 3824 } 3825 for (size_t i = 0; i < miranda_list.size(); ++i) { 3826 mirror::ArtMethod* method = miranda_list[i]; 3827 // Leave the declaring class alone as type indices are relative to it 3828 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3829 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3830 klass->SetVirtualMethod(old_method_count + i, method); 3831 vtable->Set<false>(old_vtable_count + i, method); 3832 } 3833 // TODO: do not assign to the vtable field until it is fully constructed. 3834 klass->SetVTable(vtable.Get()); 3835 } 3836 3837 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3838 for (int i = 0; i < vtable->GetLength(); ++i) { 3839 CHECK(vtable->Get(i) != NULL); 3840 } 3841 3842// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3843 3844 return true; 3845} 3846 3847bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 3848 CHECK(klass.Get() != NULL); 3849 return LinkFields(klass, false); 3850} 3851 3852bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass) { 3853 CHECK(klass.Get() != NULL); 3854 size_t allocated_class_size = klass->GetClassSize(); 3855 bool success = LinkFields(klass, true); 3856 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3857 return success; 3858} 3859 3860struct LinkFieldsComparator { 3861 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3862 } 3863 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3864 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 3865 NO_THREAD_SAFETY_ANALYSIS { 3866 // First come reference fields, then 64-bit, and finally 32-bit 3867 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 3868 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 3869 if (type1 != type2) { 3870 bool is_primitive1 = type1 != Primitive::kPrimNot; 3871 bool is_primitive2 = type2 != Primitive::kPrimNot; 3872 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 3873 type1 == Primitive::kPrimDouble); 3874 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 3875 type2 == Primitive::kPrimDouble); 3876 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 3877 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 3878 if (order1 != order2) { 3879 return order1 < order2; 3880 } 3881 } 3882 // same basic group? then sort by string. 3883 return strcmp(field1->GetName(), field2->GetName()) < 0; 3884 } 3885}; 3886 3887bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static) { 3888 size_t num_fields = 3889 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3890 3891 mirror::ObjectArray<mirror::ArtField>* fields = 3892 is_static ? klass->GetSFields() : klass->GetIFields(); 3893 3894 // Initialize size and field_offset 3895 size_t size; 3896 MemberOffset field_offset(0); 3897 if (is_static) { 3898 size = klass->GetClassSize(); 3899 field_offset = mirror::Class::FieldsOffset(); 3900 } else { 3901 mirror::Class* super_class = klass->GetSuperClass(); 3902 if (super_class != NULL) { 3903 CHECK(super_class->IsResolved()) 3904 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 3905 field_offset = MemberOffset(super_class->GetObjectSize()); 3906 } 3907 size = field_offset.Uint32Value(); 3908 } 3909 3910 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 3911 3912 // we want a relatively stable order so that adding new fields 3913 // minimizes disruption of C++ version such as Class and Method. 3914 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3915 for (size_t i = 0; i < num_fields; i++) { 3916 mirror::ArtField* f = fields->Get(i); 3917 CHECK(f != NULL) << PrettyClass(klass.Get()); 3918 grouped_and_sorted_fields.push_back(f); 3919 } 3920 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 3921 LinkFieldsComparator()); 3922 3923 // References should be at the front. 3924 size_t current_field = 0; 3925 size_t num_reference_fields = 0; 3926 for (; current_field < num_fields; current_field++) { 3927 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3928 Primitive::Type type = field->GetTypeAsPrimitiveType(); 3929 bool isPrimitive = type != Primitive::kPrimNot; 3930 if (isPrimitive) { 3931 break; // past last reference, move on to the next phase 3932 } 3933 grouped_and_sorted_fields.pop_front(); 3934 num_reference_fields++; 3935 fields->Set<false>(current_field, field); 3936 field->SetOffset(field_offset); 3937 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3938 } 3939 3940 // Now we want to pack all of the double-wide fields together. If 3941 // we're not aligned, though, we want to shuffle one 32-bit field 3942 // into place. If we can't find one, we'll have to pad it. 3943 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3944 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3945 mirror::ArtField* field = grouped_and_sorted_fields[i]; 3946 Primitive::Type type = field->GetTypeAsPrimitiveType(); 3947 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 3948 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 3949 continue; 3950 } 3951 fields->Set<false>(current_field++, field); 3952 field->SetOffset(field_offset); 3953 // drop the consumed field 3954 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 3955 break; 3956 } 3957 // whether we found a 32-bit field for padding or not, we advance 3958 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3959 } 3960 3961 // Alignment is good, shuffle any double-wide fields forward, and 3962 // finish assigning field offsets to all fields. 3963 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 3964 << PrettyClass(klass.Get()); 3965 while (!grouped_and_sorted_fields.empty()) { 3966 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3967 grouped_and_sorted_fields.pop_front(); 3968 Primitive::Type type = field->GetTypeAsPrimitiveType(); 3969 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 3970 fields->Set<false>(current_field, field); 3971 field->SetOffset(field_offset); 3972 field_offset = MemberOffset(field_offset.Uint32Value() + 3973 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 3974 ? sizeof(uint64_t) 3975 : sizeof(uint32_t))); 3976 current_field++; 3977 } 3978 3979 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 3980 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 3981 // We know there are no non-reference fields in the Reference classes, and we know 3982 // that 'referent' is alphabetically last, so this is easy... 3983 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 3984 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 3985 --num_reference_fields; 3986 } 3987 3988 if (kIsDebugBuild) { 3989 // Make sure that all reference fields appear before 3990 // non-reference fields, and all double-wide fields are aligned. 3991 bool seen_non_ref = false; 3992 for (size_t i = 0; i < num_fields; i++) { 3993 mirror::ArtField* field = fields->Get(i); 3994 if (false) { // enable to debug field layout 3995 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 3996 << " class=" << PrettyClass(klass.Get()) 3997 << " field=" << PrettyField(field) 3998 << " offset=" 3999 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4000 } 4001 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4002 bool is_primitive = type != Primitive::kPrimNot; 4003 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4004 strcmp("referent", field->GetName()) == 0) { 4005 is_primitive = true; // We lied above, so we have to expect a lie here. 4006 } 4007 if (is_primitive) { 4008 if (!seen_non_ref) { 4009 seen_non_ref = true; 4010 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4011 } 4012 } else { 4013 DCHECK(!seen_non_ref) << PrettyField(field); 4014 } 4015 } 4016 if (!seen_non_ref) { 4017 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4018 } 4019 } 4020 size = field_offset.Uint32Value(); 4021 // Update klass 4022 if (is_static) { 4023 klass->SetNumReferenceStaticFields(num_reference_fields); 4024 klass->SetClassSize(size); 4025 } else { 4026 klass->SetNumReferenceInstanceFields(num_reference_fields); 4027 if (!klass->IsVariableSize()) { 4028 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(); 4029 size_t previous_size = klass->GetObjectSize(); 4030 if (previous_size != 0) { 4031 // Make sure that we didn't originally have an incorrect size. 4032 CHECK_EQ(previous_size, size) << klass->GetDescriptor(); 4033 } 4034 klass->SetObjectSize(size); 4035 } 4036 } 4037 return true; 4038} 4039 4040// Set the bitmap of reference offsets, refOffsets, from the ifields 4041// list. 4042void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4043 uint32_t reference_offsets = 0; 4044 mirror::Class* super_class = klass->GetSuperClass(); 4045 if (super_class != NULL) { 4046 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4047 // If our superclass overflowed, we don't stand a chance. 4048 if (reference_offsets == CLASS_WALK_SUPER) { 4049 klass->SetReferenceInstanceOffsets(reference_offsets); 4050 return; 4051 } 4052 } 4053 CreateReferenceOffsets(klass, false, reference_offsets); 4054} 4055 4056void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4057 CreateReferenceOffsets(klass, true, 0); 4058} 4059 4060void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4061 uint32_t reference_offsets) { 4062 size_t num_reference_fields = 4063 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4064 : klass->NumReferenceInstanceFieldsDuringLinking(); 4065 mirror::ObjectArray<mirror::ArtField>* fields = 4066 is_static ? klass->GetSFields() : klass->GetIFields(); 4067 // All of the fields that contain object references are guaranteed 4068 // to be at the beginning of the fields list. 4069 for (size_t i = 0; i < num_reference_fields; ++i) { 4070 // Note that byte_offset is the offset from the beginning of 4071 // object, not the offset into instance data 4072 mirror::ArtField* field = fields->Get(i); 4073 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4074 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4075 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4076 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4077 CHECK_NE(new_bit, 0U); 4078 reference_offsets |= new_bit; 4079 } else { 4080 reference_offsets = CLASS_WALK_SUPER; 4081 break; 4082 } 4083 } 4084 // Update fields in klass 4085 if (is_static) { 4086 klass->SetReferenceStaticOffsets(reference_offsets); 4087 } else { 4088 klass->SetReferenceInstanceOffsets(reference_offsets); 4089 } 4090} 4091 4092mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4093 Handle<mirror::DexCache> dex_cache) { 4094 DCHECK(dex_cache.Get() != nullptr); 4095 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4096 if (resolved != NULL) { 4097 return resolved; 4098 } 4099 uint32_t utf16_length; 4100 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4101 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4102 dex_cache->SetResolvedString(string_idx, string); 4103 return string; 4104} 4105 4106mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4107 mirror::Class* referrer) { 4108 StackHandleScope<2> hs(Thread::Current()); 4109 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4110 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4111 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4112} 4113 4114mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4115 Handle<mirror::DexCache> dex_cache, 4116 Handle<mirror::ClassLoader> class_loader) { 4117 DCHECK(dex_cache.Get() != NULL); 4118 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4119 if (resolved == NULL) { 4120 Thread* self = Thread::Current(); 4121 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4122 resolved = FindClass(self, descriptor, class_loader); 4123 if (resolved != NULL) { 4124 // TODO: we used to throw here if resolved's class loader was not the 4125 // boot class loader. This was to permit different classes with the 4126 // same name to be loaded simultaneously by different loaders 4127 dex_cache->SetResolvedType(type_idx, resolved); 4128 } else { 4129 CHECK(self->IsExceptionPending()) 4130 << "Expected pending exception for failed resolution of: " << descriptor; 4131 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4132 StackHandleScope<1> hs(self); 4133 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4134 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4135 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4136 self->ClearException(); 4137 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4138 self->GetException(NULL)->SetCause(cause.Get()); 4139 } 4140 } 4141 } 4142 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4143 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4144 return resolved; 4145} 4146 4147mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 4148 Handle<mirror::DexCache> dex_cache, 4149 Handle<mirror::ClassLoader> class_loader, 4150 Handle<mirror::ArtMethod> referrer, 4151 InvokeType type) { 4152 DCHECK(dex_cache.Get() != NULL); 4153 // Check for hit in the dex cache. 4154 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4155 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 4156 return resolved; 4157 } 4158 // Fail, get the declaring class. 4159 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4160 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4161 if (klass == NULL) { 4162 DCHECK(Thread::Current()->IsExceptionPending()); 4163 return NULL; 4164 } 4165 // Scan using method_idx, this saves string compares but will only hit for matching dex 4166 // caches/files. 4167 switch (type) { 4168 case kDirect: // Fall-through. 4169 case kStatic: 4170 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 4171 break; 4172 case kInterface: 4173 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 4174 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4175 break; 4176 case kSuper: // Fall-through. 4177 case kVirtual: 4178 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 4179 break; 4180 default: 4181 LOG(FATAL) << "Unreachable - invocation type: " << type; 4182 } 4183 if (resolved == NULL) { 4184 // Search by name, which works across dex files. 4185 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4186 const Signature signature = dex_file.GetMethodSignature(method_id); 4187 switch (type) { 4188 case kDirect: // Fall-through. 4189 case kStatic: 4190 resolved = klass->FindDirectMethod(name, signature); 4191 break; 4192 case kInterface: 4193 resolved = klass->FindInterfaceMethod(name, signature); 4194 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4195 break; 4196 case kSuper: // Fall-through. 4197 case kVirtual: 4198 resolved = klass->FindVirtualMethod(name, signature); 4199 break; 4200 } 4201 } 4202 if (resolved != NULL) { 4203 // We found a method, check for incompatible class changes. 4204 if (resolved->CheckIncompatibleClassChange(type)) { 4205 resolved = NULL; 4206 } 4207 } 4208 if (resolved != NULL) { 4209 // Be a good citizen and update the dex cache to speed subsequent calls. 4210 dex_cache->SetResolvedMethod(method_idx, resolved); 4211 return resolved; 4212 } else { 4213 // We failed to find the method which means either an access error, an incompatible class 4214 // change, or no such method. First try to find the method among direct and virtual methods. 4215 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4216 const Signature signature = dex_file.GetMethodSignature(method_id); 4217 switch (type) { 4218 case kDirect: 4219 case kStatic: 4220 resolved = klass->FindVirtualMethod(name, signature); 4221 break; 4222 case kInterface: 4223 case kVirtual: 4224 case kSuper: 4225 resolved = klass->FindDirectMethod(name, signature); 4226 break; 4227 } 4228 4229 // If we found something, check that it can be accessed by the referrer. 4230 if (resolved != NULL && referrer.Get() != NULL) { 4231 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4232 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4233 if (!referring_class->CanAccess(methods_class)) { 4234 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4235 resolved, type); 4236 return NULL; 4237 } else if (!referring_class->CanAccessMember(methods_class, 4238 resolved->GetAccessFlags())) { 4239 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4240 return NULL; 4241 } 4242 } 4243 4244 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4245 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4246 switch (type) { 4247 case kDirect: 4248 case kStatic: 4249 if (resolved != NULL) { 4250 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4251 } else { 4252 resolved = klass->FindInterfaceMethod(name, signature); 4253 if (resolved != NULL) { 4254 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4255 } else { 4256 ThrowNoSuchMethodError(type, klass, name, signature); 4257 } 4258 } 4259 break; 4260 case kInterface: 4261 if (resolved != NULL) { 4262 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4263 } else { 4264 resolved = klass->FindVirtualMethod(name, signature); 4265 if (resolved != NULL) { 4266 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4267 } else { 4268 ThrowNoSuchMethodError(type, klass, name, signature); 4269 } 4270 } 4271 break; 4272 case kSuper: 4273 ThrowNoSuchMethodError(type, klass, name, signature); 4274 break; 4275 case kVirtual: 4276 if (resolved != NULL) { 4277 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4278 } else { 4279 resolved = klass->FindInterfaceMethod(name, signature); 4280 if (resolved != NULL) { 4281 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4282 } else { 4283 ThrowNoSuchMethodError(type, klass, name, signature); 4284 } 4285 } 4286 break; 4287 } 4288 DCHECK(Thread::Current()->IsExceptionPending()); 4289 return NULL; 4290 } 4291} 4292 4293mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4294 Handle<mirror::DexCache> dex_cache, 4295 Handle<mirror::ClassLoader> class_loader, 4296 bool is_static) { 4297 DCHECK(dex_cache.Get() != nullptr); 4298 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4299 if (resolved != NULL) { 4300 return resolved; 4301 } 4302 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4303 Thread* const self = Thread::Current(); 4304 StackHandleScope<1> hs(self); 4305 Handle<mirror::Class> klass( 4306 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4307 if (klass.Get() == NULL) { 4308 DCHECK(Thread::Current()->IsExceptionPending()); 4309 return NULL; 4310 } 4311 4312 if (is_static) { 4313 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 4314 } else { 4315 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 4316 } 4317 4318 if (resolved == NULL) { 4319 const char* name = dex_file.GetFieldName(field_id); 4320 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4321 if (is_static) { 4322 resolved = mirror::Class::FindStaticField(self, klass, name, type); 4323 } else { 4324 resolved = klass->FindInstanceField(name, type); 4325 } 4326 if (resolved == NULL) { 4327 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 4328 return NULL; 4329 } 4330 } 4331 dex_cache->SetResolvedField(field_idx, resolved); 4332 return resolved; 4333} 4334 4335mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4336 uint32_t field_idx, 4337 Handle<mirror::DexCache> dex_cache, 4338 Handle<mirror::ClassLoader> class_loader) { 4339 DCHECK(dex_cache.Get() != nullptr); 4340 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4341 if (resolved != NULL) { 4342 return resolved; 4343 } 4344 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4345 Thread* self = Thread::Current(); 4346 StackHandleScope<1> hs(self); 4347 Handle<mirror::Class> klass( 4348 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4349 if (klass.Get() == NULL) { 4350 DCHECK(Thread::Current()->IsExceptionPending()); 4351 return NULL; 4352 } 4353 4354 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4355 StringPiece type(dex_file.StringDataByIdx( 4356 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4357 resolved = mirror::Class::FindField(self, klass, name, type); 4358 if (resolved != NULL) { 4359 dex_cache->SetResolvedField(field_idx, resolved); 4360 } else { 4361 ThrowNoSuchFieldError("", klass.Get(), type, name); 4362 } 4363 return resolved; 4364} 4365 4366const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4367 uint32_t* length) { 4368 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4369 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4370 const DexFile& dex_file = *dex_cache->GetDexFile(); 4371 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4372 return dex_file.GetMethodShorty(method_id, length); 4373} 4374 4375void ClassLinker::DumpAllClasses(int flags) { 4376 if (dex_cache_image_class_lookup_required_) { 4377 MoveImageClassesToClassTable(); 4378 } 4379 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4380 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4381 std::vector<mirror::Class*> all_classes; 4382 { 4383 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4384 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 4385 mirror::Class** root = &it.second; 4386 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 4387 all_classes.push_back(klass); 4388 } 4389 } 4390 4391 for (size_t i = 0; i < all_classes.size(); ++i) { 4392 all_classes[i]->DumpClass(std::cerr, flags); 4393 } 4394} 4395 4396void ClassLinker::DumpForSigQuit(std::ostream& os) { 4397 if (dex_cache_image_class_lookup_required_) { 4398 MoveImageClassesToClassTable(); 4399 } 4400 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4401 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4402} 4403 4404size_t ClassLinker::NumLoadedClasses() { 4405 if (dex_cache_image_class_lookup_required_) { 4406 MoveImageClassesToClassTable(); 4407 } 4408 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4409 return class_table_.size(); 4410} 4411 4412pid_t ClassLinker::GetClassesLockOwner() { 4413 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4414} 4415 4416pid_t ClassLinker::GetDexLockOwner() { 4417 return dex_lock_.GetExclusiveOwnerTid(); 4418} 4419 4420void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4421 DCHECK(!init_done_); 4422 4423 DCHECK(klass != NULL); 4424 DCHECK(klass->GetClassLoader() == NULL); 4425 4426 mirror::ObjectArray<mirror::Class>* class_roots = 4427 ReadBarrier::BarrierForRoot<mirror::ObjectArray<mirror::Class>, kWithReadBarrier>( 4428 &class_roots_); 4429 DCHECK(class_roots != NULL); 4430 DCHECK(class_roots->Get(class_root) == NULL); 4431 class_roots->Set<false>(class_root, klass); 4432} 4433 4434} // namespace art 4435