class_linker.cc revision 0e12bdc49744eb6d5c29b9611a8dbe10bac4cd53
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 23#include <deque> 24#include <string> 25#include <utility> 26#include <vector> 27 28#include "base/casts.h" 29#include "base/logging.h" 30#include "base/stl_util.h" 31#include "base/unix_file/fd_file.h" 32#include "class_linker-inl.h" 33#include "compiler_callbacks.h" 34#include "debugger.h" 35#include "dex_file-inl.h" 36#include "gc/accounting/card_table-inl.h" 37#include "gc/accounting/heap_bitmap.h" 38#include "gc/heap.h" 39#include "gc/space/image_space.h" 40#include "handle_scope.h" 41#include "intern_table.h" 42#include "interpreter/interpreter.h" 43#include "leb128.h" 44#include "oat.h" 45#include "oat_file.h" 46#include "mirror/art_field-inl.h" 47#include "mirror/art_method-inl.h" 48#include "mirror/class.h" 49#include "mirror/class-inl.h" 50#include "mirror/class_loader.h" 51#include "mirror/dex_cache-inl.h" 52#include "mirror/iftable-inl.h" 53#include "mirror/object-inl.h" 54#include "mirror/object_array-inl.h" 55#include "mirror/proxy.h" 56#include "mirror/stack_trace_element.h" 57#include "object_utils.h" 58#include "os.h" 59#include "runtime.h" 60#include "entrypoints/entrypoint_utils.h" 61#include "ScopedLocalRef.h" 62#include "scoped_thread_state_change.h" 63#include "handle_scope-inl.h" 64#include "thread.h" 65#include "UniquePtrCompat.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 ClassHelper ve_ch(c->GetVerifyErrorClass()); 100 self->ThrowNewException(throw_location, ve_ch.GetDescriptor(), 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 194void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 195 VLOG(startup) << "ClassLinker::Init"; 196 CHECK(Runtime::Current()->IsCompiler()); 197 198 CHECK(!init_done_); 199 200 // java_lang_Class comes first, it's needed for AllocClass 201 Thread* self = Thread::Current(); 202 gc::Heap* heap = Runtime::Current()->GetHeap(); 203 // The GC can't handle an object with a null class since we can't get the size of this object. 204 heap->IncrementDisableMovingGC(self); 205 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 206 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 207 heap->AllocNonMovableObject<true>(self, nullptr, sizeof(mirror::ClassClass), VoidFunctor())))); 208 CHECK(java_lang_Class.Get() != NULL); 209 mirror::Class::SetClassClass(java_lang_Class.Get()); 210 java_lang_Class->SetClass(java_lang_Class.Get()); 211 if (kUseBakerOrBrooksReadBarrier) { 212 java_lang_Class->AssertReadBarrierPointer(); 213 } 214 java_lang_Class->SetClassSize(sizeof(mirror::ClassClass)); 215 heap->DecrementDisableMovingGC(self); 216 // AllocClass(mirror::Class*) can now be used 217 218 // Class[] is used for reflection support. 219 Handle<mirror::Class> class_array_class( 220 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 221 class_array_class->SetComponentType(java_lang_Class.Get()); 222 223 // java_lang_Object comes next so that object_array_class can be created. 224 Handle<mirror::Class> java_lang_Object( 225 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 226 CHECK(java_lang_Object.Get() != NULL); 227 // backfill Object as the super class of Class. 228 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 229 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 230 231 // Object[] next to hold class roots. 232 Handle<mirror::Class> object_array_class( 233 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 234 object_array_class->SetComponentType(java_lang_Object.Get()); 235 236 // Setup the char class to be used for char[]. 237 Handle<mirror::Class> char_class(hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 238 239 // Setup the char[] class to be used for String. 240 Handle<mirror::Class> char_array_class(hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 241 char_array_class->SetComponentType(char_class.Get()); 242 mirror::CharArray::SetArrayClass(char_array_class.Get()); 243 244 // Setup String. 245 Handle<mirror::Class> java_lang_String(hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::StringClass)))); 246 mirror::String::SetClass(java_lang_String.Get()); 247 java_lang_String->SetObjectSize(sizeof(mirror::String)); 248 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 249 250 // Create storage for root classes, save away our work so far (requires descriptors). 251 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 252 kClassRootsMax); 253 CHECK(class_roots_ != NULL); 254 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 255 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 256 SetClassRoot(kClassArrayClass, class_array_class.Get()); 257 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 258 SetClassRoot(kCharArrayClass, char_array_class.Get()); 259 SetClassRoot(kJavaLangString, java_lang_String.Get()); 260 261 // Setup the primitive type classes. 262 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 263 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 264 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 265 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 266 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 267 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 268 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 269 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 270 271 // Create array interface entries to populate once we can load system classes. 272 array_iftable_ = AllocIfTable(self, 2); 273 274 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 275 Handle<mirror::Class> int_array_class( 276 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 277 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 278 mirror::IntArray::SetArrayClass(int_array_class.Get()); 279 SetClassRoot(kIntArrayClass, int_array_class.Get()); 280 281 // now that these are registered, we can use AllocClass() and AllocObjectArray 282 283 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 284 Handle<mirror::Class> java_lang_DexCache( 285 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::DexCacheClass)))); 286 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 287 java_lang_DexCache->SetObjectSize(sizeof(mirror::DexCache)); 288 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 289 290 // Constructor, Field, Method, and AbstractMethod are necessary so that FindClass can link members. 291 Handle<mirror::Class> java_lang_reflect_ArtField( 292 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::ArtFieldClass)))); 293 CHECK(java_lang_reflect_ArtField.Get() != NULL); 294 java_lang_reflect_ArtField->SetObjectSize(sizeof(mirror::ArtField)); 295 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 296 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 297 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 298 299 Handle<mirror::Class> java_lang_reflect_ArtMethod( 300 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::ArtMethodClass)))); 301 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 302 java_lang_reflect_ArtMethod->SetObjectSize(sizeof(mirror::ArtMethod)); 303 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 304 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 305 306 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 307 308 // Set up array classes for string, field, method 309 Handle<mirror::Class> object_array_string( 310 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 311 object_array_string->SetComponentType(java_lang_String.Get()); 312 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 313 314 Handle<mirror::Class> object_array_art_method( 315 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 316 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 317 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 318 319 Handle<mirror::Class> object_array_art_field( 320 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 321 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 322 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 323 324 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 325 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 326 // these roots. 327 CHECK_NE(0U, boot_class_path.size()); 328 for (size_t i = 0; i != boot_class_path.size(); ++i) { 329 const DexFile* dex_file = boot_class_path[i]; 330 CHECK(dex_file != NULL); 331 AppendToBootClassPath(*dex_file); 332 } 333 334 // now we can use FindSystemClass 335 336 // run char class through InitializePrimitiveClass to finish init 337 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 338 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 339 340 // Create runtime resolution and imt conflict methods. Also setup the default imt. 341 Runtime* runtime = Runtime::Current(); 342 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 343 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 344 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 345 346 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 347 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 348 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 349 CHECK_EQ(java_lang_Object.Get(), Object_class); 350 CHECK_EQ(java_lang_Object->GetObjectSize(), sizeof(mirror::Object)); 351 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 352 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 353 CHECK_EQ(java_lang_String.Get(), String_class); 354 CHECK_EQ(java_lang_String->GetObjectSize(), sizeof(mirror::String)); 355 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 356 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 357 CHECK_EQ(java_lang_String.Get(), String_class); 358 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 359 CHECK_EQ(java_lang_DexCache->GetObjectSize(), sizeof(mirror::DexCache)); 360 361 // Setup the primitive array type classes - can't be done until Object has a vtable. 362 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 363 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 364 365 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 366 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 367 368 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 369 CHECK_EQ(char_array_class.Get(), found_char_array_class); 370 371 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 372 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 373 374 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 375 CHECK_EQ(int_array_class.Get(), found_int_array_class); 376 377 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 378 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 379 380 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 381 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 382 383 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 384 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 385 386 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 387 CHECK_EQ(class_array_class.Get(), found_class_array_class); 388 389 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 390 CHECK_EQ(object_array_class.Get(), found_object_array_class); 391 392 // Setup the single, global copy of "iftable". 393 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 394 CHECK(java_lang_Cloneable != NULL); 395 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 396 CHECK(java_io_Serializable != NULL); 397 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 398 // crawl up and explicitly list all of the supers as well. 399 array_iftable_->SetInterface(0, java_lang_Cloneable); 400 array_iftable_->SetInterface(1, java_io_Serializable); 401 402 // Sanity check Class[] and Object[]'s interfaces. 403 ClassHelper kh(class_array_class.Get()); 404 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 405 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 406 kh.ChangeClass(object_array_class.Get()); 407 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 408 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 409 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 410 // dex_cache_ fields and register them in class_table_. 411 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 412 CHECK_EQ(java_lang_Class.Get(), Class_class); 413 414 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 415 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 416 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 417 418 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 419 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 420 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 421 422 mirror::Class* String_array_class = FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 423 CHECK_EQ(object_array_string.Get(), String_array_class); 424 425 mirror::Class* Art_method_array_class = 426 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 427 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 428 429 mirror::Class* Art_field_array_class = 430 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 431 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 432 433 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 434 435 // Create java.lang.reflect.Proxy root. 436 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 437 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 438 439 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 440 mirror::Class* java_lang_ref_Reference = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 441 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference); 442 mirror::Class* java_lang_ref_FinalizerReference = FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 443 java_lang_ref_FinalizerReference->SetAccessFlags( 444 java_lang_ref_FinalizerReference->GetAccessFlags() | 445 kAccClassIsReference | kAccClassIsFinalizerReference); 446 mirror::Class* java_lang_ref_PhantomReference = FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 447 java_lang_ref_PhantomReference->SetAccessFlags( 448 java_lang_ref_PhantomReference->GetAccessFlags() | 449 kAccClassIsReference | kAccClassIsPhantomReference); 450 mirror::Class* java_lang_ref_SoftReference = FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 451 java_lang_ref_SoftReference->SetAccessFlags( 452 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 453 mirror::Class* java_lang_ref_WeakReference = FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 454 java_lang_ref_WeakReference->SetAccessFlags( 455 java_lang_ref_WeakReference->GetAccessFlags() | 456 kAccClassIsReference | kAccClassIsWeakReference); 457 458 // Setup the ClassLoader, verifying the object_size_. 459 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 460 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), sizeof(mirror::ClassLoader)); 461 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 462 463 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 464 // java.lang.StackTraceElement as a convenience. 465 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 466 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 467 SetClassRoot(kJavaLangClassNotFoundException, FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 468 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 469 SetClassRoot(kJavaLangStackTraceElementArrayClass, FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 470 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 471 472 FinishInit(self); 473 474 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 475} 476 477void ClassLinker::FinishInit(Thread* self) { 478 VLOG(startup) << "ClassLinker::FinishInit entering"; 479 480 // Let the heap know some key offsets into java.lang.ref instances 481 // Note: we hard code the field indexes here rather than using FindInstanceField 482 // as the types of the field can't be resolved prior to the runtime being 483 // fully initialized 484 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 485 mirror::Class* java_lang_ref_FinalizerReference = 486 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 487 488 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 489 FieldHelper fh(pendingNext); 490 CHECK_STREQ(fh.GetName(), "pendingNext"); 491 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 492 493 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 494 fh.ChangeField(queue); 495 CHECK_STREQ(fh.GetName(), "queue"); 496 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 497 498 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 499 fh.ChangeField(queueNext); 500 CHECK_STREQ(fh.GetName(), "queueNext"); 501 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 502 503 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 504 fh.ChangeField(referent); 505 CHECK_STREQ(fh.GetName(), "referent"); 506 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 507 508 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 509 fh.ChangeField(zombie); 510 CHECK_STREQ(fh.GetName(), "zombie"); 511 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 512 513 // ensure all class_roots_ are initialized 514 for (size_t i = 0; i < kClassRootsMax; i++) { 515 ClassRoot class_root = static_cast<ClassRoot>(i); 516 mirror::Class* klass = GetClassRoot(class_root); 517 CHECK(klass != NULL); 518 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 519 // note SetClassRoot does additional validation. 520 // if possible add new checks there to catch errors early 521 } 522 523 CHECK(array_iftable_ != NULL); 524 525 // disable the slow paths in FindClass and CreatePrimitiveClass now 526 // that Object, Class, and Object[] are setup 527 init_done_ = true; 528 529 VLOG(startup) << "ClassLinker::FinishInit exiting"; 530} 531 532void ClassLinker::RunRootClinits() { 533 Thread* self = Thread::Current(); 534 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 535 mirror::Class* c = GetClassRoot(ClassRoot(i)); 536 if (!c->IsArrayClass() && !c->IsPrimitive()) { 537 StackHandleScope<1> hs(self); 538 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 539 EnsureInitialized(h_class, true, true); 540 self->AssertNoPendingException(); 541 } 542 } 543} 544 545bool ClassLinker::GenerateOatFile(const char* dex_filename, 546 int oat_fd, 547 const char* oat_cache_filename, 548 std::string* error_msg) { 549 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 550 std::string dex2oat(GetAndroidRoot()); 551 dex2oat += (kIsDebugBuild ? "/bin/dex2oatd" : "/bin/dex2oat"); 552 553 gc::Heap* heap = Runtime::Current()->GetHeap(); 554 std::string boot_image_option("--boot-image="); 555 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 556 557 std::string dex_file_option("--dex-file="); 558 dex_file_option += dex_filename; 559 560 std::string oat_fd_option("--oat-fd="); 561 StringAppendF(&oat_fd_option, "%d", oat_fd); 562 563 std::string oat_location_option("--oat-location="); 564 oat_location_option += oat_cache_filename; 565 566 std::vector<std::string> argv; 567 argv.push_back(dex2oat); 568 argv.push_back("--runtime-arg"); 569 argv.push_back("-Xms64m"); 570 argv.push_back("--runtime-arg"); 571 argv.push_back("-Xmx64m"); 572 argv.push_back("--runtime-arg"); 573 argv.push_back("-classpath"); 574 argv.push_back("--runtime-arg"); 575 argv.push_back(Runtime::Current()->GetClassPathString()); 576 577 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 578 579 if (!Runtime::Current()->IsVerificationEnabled()) { 580 argv.push_back("--compiler-filter=verify-none"); 581 } 582 583 if (!kIsTargetBuild) { 584 argv.push_back("--host"); 585 } 586 587 argv.push_back(boot_image_option); 588 argv.push_back(dex_file_option); 589 argv.push_back(oat_fd_option); 590 argv.push_back(oat_location_option); 591 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 592 for (size_t i = 0; i < compiler_options.size(); ++i) { 593 argv.push_back(compiler_options[i].c_str()); 594 } 595 596 return Exec(argv, error_msg); 597} 598 599const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 600 WriterMutexLock mu(Thread::Current(), dex_lock_); 601 if (kIsDebugBuild) { 602 for (size_t i = 0; i < oat_files_.size(); ++i) { 603 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 604 } 605 } 606 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 607 oat_files_.push_back(oat_file); 608 return oat_file; 609} 610 611OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 612 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 613 OatFile* oat_file = space->ReleaseOatFile(); 614 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 615 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 616 return *oat_file; 617} 618 619const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 620 const char* dex_location = dex_file.GetLocation().c_str(); 621 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 622 return FindOpenedOatFileFromDexLocation(dex_location, &dex_location_checksum); 623} 624 625const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation(const char* dex_location, 626 const uint32_t* const dex_location_checksum) { 627 ReaderMutexLock mu(Thread::Current(), dex_lock_); 628 for (size_t i = 0; i < oat_files_.size(); i++) { 629 const OatFile* oat_file = oat_files_[i]; 630 DCHECK(oat_file != NULL); 631 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 632 dex_location_checksum, 633 false); 634 if (oat_dex_file != NULL) { 635 return oat_file; 636 } 637 } 638 return NULL; 639} 640 641const DexFile* ClassLinker::FindDexFileInOatLocation(const char* dex_location, 642 uint32_t dex_location_checksum, 643 const char* oat_location, 644 std::string* error_msg) { 645 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 646 !Runtime::Current()->IsCompiler(), 647 error_msg)); 648 if (oat_file.get() == nullptr) { 649 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 650 error_msg->c_str()); 651 return nullptr; 652 } 653 Runtime* runtime = Runtime::Current(); 654 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 655 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 656 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 657 if (expected_image_oat_checksum != actual_image_oat_checksum) { 658 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 659 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 660 actual_image_oat_checksum); 661 return nullptr; 662 } 663 664 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 665 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 666 if (expected_image_oat_offset != actual_image_oat_offset) { 667 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 668 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 669 actual_image_oat_offset); 670 return nullptr; 671 } 672 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 673 &dex_location_checksum); 674 if (oat_dex_file == nullptr) { 675 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 676 dex_location); 677 return nullptr; 678 } 679 uint32_t expected_dex_checksum = dex_location_checksum; 680 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 681 if (expected_dex_checksum != actual_dex_checksum) { 682 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 683 "found 0x%x", oat_location, expected_dex_checksum, 684 actual_dex_checksum); 685 return nullptr; 686 } 687 const DexFile* dex_file = oat_dex_file->OpenDexFile(error_msg); 688 if (dex_file != nullptr) { 689 RegisterOatFile(oat_file.release()); 690 } 691 return dex_file; 692} 693 694class ScopedFlock { 695 public: 696 ScopedFlock() {} 697 698 bool Init(const char* filename, std::string* error_msg) { 699 while (true) { 700 file_.reset(OS::OpenFileWithFlags(filename, O_CREAT | O_RDWR)); 701 if (file_.get() == NULL) { 702 *error_msg = StringPrintf("Failed to open file '%s': %s", filename, strerror(errno)); 703 return false; 704 } 705 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_EX)); 706 if (flock_result != 0) { 707 *error_msg = StringPrintf("Failed to lock file '%s': %s", filename, strerror(errno)); 708 return false; 709 } 710 struct stat fstat_stat; 711 int fstat_result = TEMP_FAILURE_RETRY(fstat(file_->Fd(), &fstat_stat)); 712 if (fstat_result != 0) { 713 *error_msg = StringPrintf("Failed to fstat file '%s': %s", filename, strerror(errno)); 714 return false; 715 } 716 struct stat stat_stat; 717 int stat_result = TEMP_FAILURE_RETRY(stat(filename, &stat_stat)); 718 if (stat_result != 0) { 719 PLOG(WARNING) << "Failed to stat, will retry: " << filename; 720 // ENOENT can happen if someone racing with us unlinks the file we created so just retry. 721 continue; 722 } 723 if (fstat_stat.st_dev != stat_stat.st_dev || fstat_stat.st_ino != stat_stat.st_ino) { 724 LOG(WARNING) << "File changed while locking, will retry: " << filename; 725 continue; 726 } 727 return true; 728 } 729 } 730 731 File& GetFile() { 732 return *file_; 733 } 734 735 ~ScopedFlock() { 736 if (file_.get() != NULL) { 737 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_UN)); 738 CHECK_EQ(0, flock_result); 739 } 740 } 741 742 private: 743 UniquePtr<File> file_; 744 745 DISALLOW_COPY_AND_ASSIGN(ScopedFlock); 746}; 747 748const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation(const char* dex_location, 749 uint32_t dex_location_checksum, 750 const char* oat_location, 751 std::vector<std::string>* error_msgs) { 752 // We play a locking game here so that if two different processes 753 // race to generate (or worse, one tries to open a partial generated 754 // file) we will be okay. This is actually common with apps that use 755 // DexClassLoader to work around the dex method reference limit and 756 // that have a background service running in a separate process. 757 ScopedFlock scoped_flock; 758 std::string error_msg; 759 if (!scoped_flock.Init(oat_location, &error_msg)) { 760 error_msgs->push_back(error_msg); 761 return nullptr; 762 } 763 764 // Check if we already have an up-to-date output file 765 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, dex_location_checksum, 766 oat_location, &error_msg); 767 if (dex_file != nullptr) { 768 return dex_file; 769 } 770 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 771 dex_location, oat_location, error_msg.c_str()); 772 VLOG(class_linker) << compound_msg; 773 error_msgs->push_back(compound_msg); 774 775 // Generate the output oat file for the dex file 776 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 777 if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location, &error_msg)) { 778 CHECK(!error_msg.empty()); 779 error_msgs->push_back(error_msg); 780 return nullptr; 781 } 782 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 783 !Runtime::Current()->IsCompiler(), 784 &error_msg)); 785 if (oat_file.get() == nullptr) { 786 compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 787 oat_location, error_msg.c_str()); 788 error_msgs->push_back(compound_msg); 789 return nullptr; 790 } 791 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 792 &dex_location_checksum); 793 if (oat_dex_file == nullptr) { 794 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out file " 795 "'%s'", dex_location, dex_location_checksum, oat_location); 796 error_msgs->push_back(error_msg); 797 return nullptr; 798 } 799 const DexFile* result = oat_dex_file->OpenDexFile(&error_msg); 800 CHECK(result != nullptr) << error_msgs << ", " << error_msg; 801 CHECK_EQ(dex_location_checksum, result->GetLocationChecksum()) 802 << "dex_location=" << dex_location << " oat_location=" << oat_location << std::hex 803 << " dex_location_checksum=" << dex_location_checksum 804 << " DexFile::GetLocationChecksum()=" << result->GetLocationChecksum(); 805 RegisterOatFile(oat_file.release()); 806 return result; 807} 808 809bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 810 const char* dex_location, 811 uint32_t dex_location_checksum, 812 const InstructionSet instruction_set, 813 std::string* error_msg) { 814 Runtime* runtime = Runtime::Current(); 815 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 816 817 // If the requested instruction set is the same as the current runtime, 818 // we can use the checksums directly. If it isn't, we'll have to read the 819 // image header from the image for the right instruction set. 820 uint32_t image_oat_checksum = 0; 821 uintptr_t image_oat_data_begin = 0; 822 if (instruction_set == kRuntimeISA) { 823 const ImageHeader& image_header = image_space->GetImageHeader(); 824 image_oat_checksum = image_header.GetOatChecksum(); 825 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 826 } else { 827 UniquePtr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 828 image_space->GetImageLocation().c_str(), instruction_set)); 829 image_oat_checksum = image_header->GetOatChecksum(); 830 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 831 } 832 const OatHeader& oat_header = oat_file->GetOatHeader(); 833 bool image_check = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 834 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 835 836 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 837 if (oat_dex_file == NULL) { 838 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 839 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 840 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 841 for (size_t i = 0; i < oat_dex_files.size(); i++) { 842 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 843 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 844 oat_file->GetLocation().c_str(), 845 oat_dex_file->GetDexFileLocation().c_str()); 846 } 847 return false; 848 } 849 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 850 851 if (image_check && dex_check) { 852 return true; 853 } 854 855 if (!image_check) { 856 ScopedObjectAccess soa(Thread::Current()); 857 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with (0x%x, %" PRIdPTR ")", 858 oat_file->GetLocation().c_str(), 859 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 860 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 861 image_oat_checksum, image_oat_data_begin); 862 } 863 if (!dex_check) { 864 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 865 oat_file->GetLocation().c_str(), 866 oat_dex_file->GetDexFileLocationChecksum(), 867 dex_location, dex_location_checksum); 868 } 869 return false; 870} 871 872const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const std::string& oat_file_location, 873 const char* dex_location, 874 std::string* error_msg, 875 bool* open_failed) { 876 UniquePtr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 877 if (oat_file.get() == nullptr) { 878 *open_failed = true; 879 return nullptr; 880 } 881 *open_failed = false; 882 const DexFile* dex_file = nullptr; 883 uint32_t dex_location_checksum; 884 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 885 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 886 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 887 // directory. 888 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 889 if (oat_dex_file == nullptr) { 890 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 891 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 892 error_msg->c_str()); 893 return nullptr; 894 } 895 dex_file = oat_dex_file->OpenDexFile(error_msg); 896 } else { 897 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 898 kRuntimeISA, error_msg); 899 if (!verified) { 900 return nullptr; 901 } 902 dex_file = oat_file->GetOatDexFile(dex_location, 903 &dex_location_checksum)->OpenDexFile(error_msg); 904 } 905 if (dex_file != nullptr) { 906 RegisterOatFile(oat_file.release()); 907 } 908 return dex_file; 909} 910 911const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const char* dex_location, 912 const uint32_t* const dex_location_checksum, 913 InstructionSet isa, 914 std::vector<std::string>* error_msgs) { 915 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location, 916 dex_location_checksum); 917 if (open_oat_file != nullptr) { 918 const OatFile::OatDexFile* oat_dex_file = open_oat_file->GetOatDexFile(dex_location, 919 dex_location_checksum); 920 std::string error_msg; 921 const DexFile* ret = oat_dex_file->OpenDexFile(&error_msg); 922 if (ret == nullptr) { 923 error_msgs->push_back(error_msg); 924 } 925 return ret; 926 } 927 928 // Look for an existing file next to dex. for example, for 929 // /foo/bar/baz.jar, look for /foo/bar/<isa>/baz.odex. 930 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 931 bool open_failed; 932 std::string error_msg; 933 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(odex_filename, dex_location, 934 &error_msg, &open_failed); 935 if (dex_file != nullptr) { 936 return dex_file; 937 } 938 if (dex_location_checksum == nullptr) { 939 error_msgs->push_back(StringPrintf("Failed to open oat file from %s and no classes.dex found in" 940 "%s: %s", odex_filename.c_str(), dex_location, 941 error_msg.c_str())); 942 return nullptr; 943 } 944 945 std::string cache_error_msg; 946 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 947 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location, 948 dalvik_cache.c_str())); 949 dex_file = VerifyAndOpenDexFileFromOatFile(cache_location, dex_location, &cache_error_msg, 950 &open_failed); 951 if (dex_file != nullptr) { 952 return dex_file; 953 } 954 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 955 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 956 } 957 std::string compound_msg = StringPrintf("Failed to open oat file from %s (error '%s') or %s " 958 "(error '%s').", odex_filename.c_str(), error_msg.c_str(), 959 cache_location.c_str(), cache_error_msg.c_str()); 960 VLOG(class_linker) << compound_msg; 961 error_msgs->push_back(compound_msg); 962 963 // Try to generate oat file if it wasn't found or was obsolete. 964 return FindOrCreateOatFileForDexLocation(dex_location, *dex_location_checksum, 965 cache_location.c_str(), error_msgs); 966} 967 968const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 969 ReaderMutexLock mu(Thread::Current(), dex_lock_); 970 for (size_t i = 0; i < oat_files_.size(); i++) { 971 const OatFile* oat_file = oat_files_[i]; 972 DCHECK(oat_file != nullptr); 973 if (oat_file->GetLocation() == oat_location) { 974 return oat_file; 975 } 976 } 977 return nullptr; 978} 979 980const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 981 std::string* error_msg) { 982 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 983 if (oat_file != nullptr) { 984 return oat_file; 985 } 986 987 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 988 error_msg); 989 if (oat_file == NULL) { 990 return NULL; 991 } 992 return oat_file; 993} 994 995static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 996 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 997 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 998 999 DCHECK(obj != NULL); 1000 DCHECK(class_linker != NULL); 1001 1002 if (obj->IsArtMethod()) { 1003 mirror::ArtMethod* method = obj->AsArtMethod(); 1004 if (!method->IsNative()) { 1005 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1006 if (method != Runtime::Current()->GetResolutionMethod()) { 1007 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1008 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1009 } 1010 } 1011 } 1012} 1013 1014void ClassLinker::InitFromImage() { 1015 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1016 CHECK(!init_done_); 1017 1018 Thread* self = Thread::Current(); 1019 gc::Heap* heap = Runtime::Current()->GetHeap(); 1020 gc::space::ImageSpace* space = heap->GetImageSpace(); 1021 dex_cache_image_class_lookup_required_ = true; 1022 CHECK(space != NULL); 1023 OatFile& oat_file = GetImageOatFile(space); 1024 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1025 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1026 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 1027 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1028 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1029 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1030 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1031 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1032 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1033 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1034 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1035 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1036 1037 StackHandleScope<1> hs(self); 1038 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1039 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1040 AsObjectArray<mirror::Class>())); 1041 class_roots_ = class_roots.Get(); 1042 1043 // Special case of setting up the String class early so that we can test arbitrary objects 1044 // as being Strings or not 1045 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1046 1047 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1048 static_cast<uint32_t>(dex_caches->GetLength())); 1049 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1050 StackHandleScope<1> hs(self); 1051 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1052 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1053 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1054 nullptr); 1055 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1056 std::string error_msg; 1057 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1058 if (dex_file == NULL) { 1059 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1060 << " from within oat file " << oat_file.GetLocation() 1061 << " error '" << error_msg << "'"; 1062 } 1063 1064 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1065 1066 AppendToBootClassPath(*dex_file, dex_cache); 1067 } 1068 1069 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1070 // bitmap walk. 1071 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1072 1073 // Set entry point to interpreter if in InterpretOnly mode. 1074 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1075 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1076 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1077 } 1078 1079 // reinit class_roots_ 1080 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1081 class_roots_ = class_roots.Get(); 1082 1083 // reinit array_iftable_ from any array class instance, they should be == 1084 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1085 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1086 // String class root was set above 1087 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1088 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1089 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1090 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1091 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1092 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1093 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1094 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1095 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1096 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1097 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1098 1099 FinishInit(self); 1100 1101 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 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 { 1131 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 1132 if ((flags & kVisitRootFlagAllRoots) != 0) { 1133 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1134 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1135 } 1136 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1137 for (auto& pair : new_class_roots_) { 1138 mirror::Object* old_ref = pair.second; 1139 callback(reinterpret_cast<mirror::Object**>(&pair.second), arg, 0, kRootStickyClass); 1140 if (UNLIKELY(pair.second != old_ref)) { 1141 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1142 // corresponding object. This is slow, but luckily for us, this may only happen with a 1143 // concurrent moving GC. 1144 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1145 it != end && it->first == pair.first; ++it) { 1146 // If the class stored matches the old class, update it to the new value. 1147 if (old_ref == it->second) { 1148 it->second = pair.second; 1149 } 1150 } 1151 } 1152 } 1153 } 1154 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1155 new_class_roots_.clear(); 1156 } 1157 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1158 log_new_class_table_roots_ = true; 1159 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1160 log_new_class_table_roots_ = false; 1161 } 1162 // We deliberately ignore the class roots in the image since we 1163 // handle image roots by using the MS/CMS rescanning of dirty cards. 1164 } 1165 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1166 DCHECK(array_iftable_ != nullptr); 1167 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1168 if (find_array_class_cache_[i] != nullptr) { 1169 callback(reinterpret_cast<mirror::Object**>(&find_array_class_cache_[i]), arg, 0, 1170 kRootVMInternal); 1171 } 1172 } 1173} 1174 1175void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1176 if (dex_cache_image_class_lookup_required_) { 1177 MoveImageClassesToClassTable(); 1178 } 1179 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1180 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 1181 if (!visitor(it.second, arg)) { 1182 return; 1183 } 1184 } 1185} 1186 1187static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1188 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1189 classes->insert(c); 1190 return true; 1191} 1192 1193void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1194 std::set<mirror::Class*> classes; 1195 VisitClasses(GetClassesVisitor, &classes); 1196 for (mirror::Class* klass : classes) { 1197 if (!visitor(klass, arg)) { 1198 return; 1199 } 1200 } 1201} 1202 1203ClassLinker::~ClassLinker() { 1204 mirror::Class::ResetClass(); 1205 mirror::String::ResetClass(); 1206 mirror::ArtField::ResetClass(); 1207 mirror::ArtMethod::ResetClass(); 1208 mirror::BooleanArray::ResetArrayClass(); 1209 mirror::ByteArray::ResetArrayClass(); 1210 mirror::CharArray::ResetArrayClass(); 1211 mirror::DoubleArray::ResetArrayClass(); 1212 mirror::FloatArray::ResetArrayClass(); 1213 mirror::IntArray::ResetArrayClass(); 1214 mirror::LongArray::ResetArrayClass(); 1215 mirror::ShortArray::ResetArrayClass(); 1216 mirror::Throwable::ResetClass(); 1217 mirror::StackTraceElement::ResetClass(); 1218 STLDeleteElements(&boot_class_path_); 1219 STLDeleteElements(&oat_files_); 1220} 1221 1222mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1223 gc::Heap* heap = Runtime::Current()->GetHeap(); 1224 StackHandleScope<16> hs(self); 1225 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1226 Handle<mirror::DexCache> dex_cache( 1227 hs.NewHandle(down_cast<mirror::DexCache*>( 1228 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1229 VoidFunctor())))); 1230 if (dex_cache.Get() == NULL) { 1231 return NULL; 1232 } 1233 Handle<mirror::String> 1234 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1235 if (location.Get() == NULL) { 1236 return NULL; 1237 } 1238 Handle<mirror::ObjectArray<mirror::String> > 1239 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1240 if (strings.Get() == NULL) { 1241 return NULL; 1242 } 1243 Handle<mirror::ObjectArray<mirror::Class> > 1244 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1245 if (types.Get() == NULL) { 1246 return NULL; 1247 } 1248 Handle<mirror::ObjectArray<mirror::ArtMethod> > 1249 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1250 if (methods.Get() == NULL) { 1251 return NULL; 1252 } 1253 Handle<mirror::ObjectArray<mirror::ArtField> > 1254 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1255 if (fields.Get() == NULL) { 1256 return NULL; 1257 } 1258 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1259 fields.Get()); 1260 return dex_cache.Get(); 1261} 1262 1263// Used to initialize a class in the allocation code path to ensure it is guarded by a StoreStore 1264// fence. 1265class InitializeClassVisitor { 1266 public: 1267 explicit InitializeClassVisitor(uint32_t class_size) : class_size_(class_size) { 1268 } 1269 1270 void operator()(mirror::Object* obj, size_t usable_size) const 1271 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1272 DCHECK_LE(class_size_, usable_size); 1273 // Avoid AsClass as object is not yet in live bitmap or allocation stack. 1274 mirror::Class* klass = down_cast<mirror::Class*>(obj); 1275 // DCHECK(klass->IsClass()); 1276 klass->SetClassSize(class_size_); 1277 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1278 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1279 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1280 } 1281 1282 private: 1283 const uint32_t class_size_; 1284 1285 DISALLOW_COPY_AND_ASSIGN(InitializeClassVisitor); 1286}; 1287 1288mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1289 uint32_t class_size) { 1290 DCHECK_GE(class_size, sizeof(mirror::Class)); 1291 gc::Heap* heap = Runtime::Current()->GetHeap(); 1292 InitializeClassVisitor visitor(class_size); 1293 mirror::Object* k = 1294 kMovingClasses ? heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) 1295 : heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1296 if (UNLIKELY(k == nullptr)) { 1297 CHECK(self->IsExceptionPending()); // OOME. 1298 return nullptr; 1299 } 1300 return k->AsClass(); 1301} 1302 1303mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1304 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1305} 1306 1307mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1308 return down_cast<mirror::ArtField*>( 1309 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1310} 1311 1312mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1313 return down_cast<mirror::ArtMethod*>( 1314 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1315} 1316 1317mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1318 Thread* self, size_t length) { 1319 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1320 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1321} 1322 1323static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1324 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1325 DCHECK(klass != NULL); 1326 // Wait for the class if it has not already been linked. 1327 if (!klass->IsResolved() && !klass->IsErroneous()) { 1328 StackHandleScope<1> hs(self); 1329 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1330 ObjectLock<mirror::Class> lock(self, h_class); 1331 // Check for circular dependencies between classes. 1332 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1333 ThrowClassCircularityError(h_class.Get()); 1334 h_class->SetStatus(mirror::Class::kStatusError, self); 1335 return nullptr; 1336 } 1337 // Wait for the pending initialization to complete. 1338 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1339 lock.WaitIgnoringInterrupts(); 1340 } 1341 } 1342 if (klass->IsErroneous()) { 1343 ThrowEarlierClassFailure(klass); 1344 return nullptr; 1345 } 1346 // Return the loaded class. No exceptions should be pending. 1347 CHECK(klass->IsResolved()) << PrettyClass(klass); 1348 self->AssertNoPendingException(); 1349 return klass; 1350} 1351 1352mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1353 const Handle<mirror::ClassLoader>& class_loader) { 1354 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1355 DCHECK(self != nullptr); 1356 self->AssertNoPendingException(); 1357 if (descriptor[1] == '\0') { 1358 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1359 // for primitive classes that aren't backed by dex files. 1360 return FindPrimitiveClass(descriptor[0]); 1361 } 1362 // Find the class in the loaded classes table. 1363 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1364 if (klass != NULL) { 1365 return EnsureResolved(self, klass); 1366 } 1367 // Class is not yet loaded. 1368 if (descriptor[0] == '[') { 1369 return CreateArrayClass(self, descriptor, class_loader); 1370 } else if (class_loader.Get() == nullptr) { 1371 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1372 if (pair.second != NULL) { 1373 StackHandleScope<1> hs(self); 1374 auto class_loader = hs.NewHandle<mirror::ClassLoader>(nullptr); 1375 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1376 } 1377 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1378 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1379 // throw of a NoClassDefFoundError. 1380 if (IsInBootClassPath(descriptor)) { 1381 mirror::Class* system_class = FindSystemClass(self, descriptor); 1382 CHECK(system_class != NULL); 1383 return system_class; 1384 } 1385 // Next try the compile time class path. 1386 const std::vector<const DexFile*>* class_path; 1387 { 1388 ScopedObjectAccessUnchecked soa(self); 1389 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1390 soa.AddLocalReference<jobject>(class_loader.Get())); 1391 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1392 } 1393 1394 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1395 if (pair.second != NULL) { 1396 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1397 } 1398 1399 } else { 1400 ScopedObjectAccessUnchecked soa(self); 1401 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1402 soa.AddLocalReference<jobject>(class_loader.Get())); 1403 std::string class_name_string(DescriptorToDot(descriptor)); 1404 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1405 { 1406 ScopedThreadStateChange tsc(self, kNative); 1407 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1408 soa.Env()->NewStringUTF(class_name_string.c_str())); 1409 if (class_name_object.get() == NULL) { 1410 return NULL; 1411 } 1412 CHECK(class_loader_object.get() != NULL); 1413 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1414 WellKnownClasses::java_lang_ClassLoader_loadClass, 1415 class_name_object.get())); 1416 } 1417 if (self->IsExceptionPending()) { 1418 // If the ClassLoader threw, pass that exception up. 1419 return NULL; 1420 } else if (result.get() == NULL) { 1421 // broken loader - throw NPE to be compatible with Dalvik 1422 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1423 class_name_string.c_str()).c_str()); 1424 return NULL; 1425 } else { 1426 // success, return mirror::Class* 1427 return soa.Decode<mirror::Class*>(result.get()); 1428 } 1429 } 1430 1431 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1432 return NULL; 1433} 1434 1435mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1436 const Handle<mirror::ClassLoader>& class_loader, 1437 const DexFile& dex_file, 1438 const DexFile::ClassDef& dex_class_def) { 1439 Thread* self = Thread::Current(); 1440 StackHandleScope<2> hs(self); 1441 auto klass = hs.NewHandle<mirror::Class>(nullptr); 1442 // Load the class from the dex file. 1443 if (UNLIKELY(!init_done_)) { 1444 // finish up init of hand crafted class_roots_ 1445 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1446 klass.Assign(GetClassRoot(kJavaLangObject)); 1447 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1448 klass.Assign(GetClassRoot(kJavaLangClass)); 1449 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1450 klass.Assign(GetClassRoot(kJavaLangString)); 1451 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1452 klass.Assign(GetClassRoot(kJavaLangDexCache)); 1453 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1454 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 1455 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1456 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 1457 } else { 1458 klass.Assign(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1459 } 1460 } else { 1461 klass.Assign(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1462 } 1463 if (UNLIKELY(klass.Get() == NULL)) { 1464 CHECK(self->IsExceptionPending()); // Expect an OOME. 1465 return NULL; 1466 } 1467 klass->SetDexCache(FindDexCache(dex_file)); 1468 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 1469 // Check for a pending exception during load 1470 if (self->IsExceptionPending()) { 1471 klass->SetStatus(mirror::Class::kStatusError, self); 1472 return NULL; 1473 } 1474 ObjectLock<mirror::Class> lock(self, klass); 1475 klass->SetClinitThreadId(self->GetTid()); 1476 // Add the newly loaded class to the loaded classes table. 1477 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 1478 if (existing != NULL) { 1479 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1480 // this thread to block. 1481 return EnsureResolved(self, existing); 1482 } 1483 // Finish loading (if necessary) by finding parents 1484 CHECK(!klass->IsLoaded()); 1485 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1486 // Loading failed. 1487 klass->SetStatus(mirror::Class::kStatusError, self); 1488 return NULL; 1489 } 1490 CHECK(klass->IsLoaded()); 1491 // Link the class (if necessary) 1492 CHECK(!klass->IsResolved()); 1493 // TODO: Use fast jobjects? 1494 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1495 if (!LinkClass(self, klass, interfaces)) { 1496 // Linking failed. 1497 klass->SetStatus(mirror::Class::kStatusError, self); 1498 return NULL; 1499 } 1500 CHECK(klass->IsResolved()); 1501 1502 /* 1503 * We send CLASS_PREPARE events to the debugger from here. The 1504 * definition of "preparation" is creating the static fields for a 1505 * class and initializing them to the standard default values, but not 1506 * executing any code (that comes later, during "initialization"). 1507 * 1508 * We did the static preparation in LinkClass. 1509 * 1510 * The class has been prepared and resolved but possibly not yet verified 1511 * at this point. 1512 */ 1513 Dbg::PostClassPrepare(klass.Get()); 1514 1515 return klass.Get(); 1516} 1517 1518// Precomputes size that will be needed for Class, matching LinkStaticFields 1519uint32_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1520 const DexFile::ClassDef& dex_class_def) { 1521 const byte* class_data = dex_file.GetClassData(dex_class_def); 1522 size_t num_ref = 0; 1523 size_t num_32 = 0; 1524 size_t num_64 = 0; 1525 if (class_data != NULL) { 1526 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1527 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1528 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1529 char c = descriptor[0]; 1530 if (c == 'L' || c == '[') { 1531 num_ref++; 1532 } else if (c == 'J' || c == 'D') { 1533 num_64++; 1534 } else { 1535 num_32++; 1536 } 1537 } 1538 } 1539 // start with generic class data 1540 uint32_t size = sizeof(mirror::Class); 1541 // follow with reference fields which must be contiguous at start 1542 size += (num_ref * sizeof(uint32_t)); 1543 // if there are 64-bit fields to add, make sure they are aligned 1544 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1545 if (num_32 != 0) { 1546 // use an available 32-bit field for padding 1547 num_32--; 1548 } 1549 size += sizeof(uint32_t); // either way, we are adding a word 1550 DCHECK_EQ(size, RoundUp(size, 8)); 1551 } 1552 // tack on any 64-bit fields now that alignment is assured 1553 size += (num_64 * sizeof(uint64_t)); 1554 // tack on any remaining 32-bit fields 1555 size += (num_32 * sizeof(uint32_t)); 1556 return size; 1557} 1558 1559OatFile::OatClass ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1560 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1561 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1562 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1563 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1564 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1565 &dex_location_checksum); 1566 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1567 return oat_dex_file->GetOatClass(class_def_idx); 1568} 1569 1570static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1571 uint32_t method_idx) { 1572 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1573 const byte* class_data = dex_file.GetClassData(class_def); 1574 CHECK(class_data != NULL); 1575 ClassDataItemIterator it(dex_file, class_data); 1576 // Skip fields 1577 while (it.HasNextStaticField()) { 1578 it.Next(); 1579 } 1580 while (it.HasNextInstanceField()) { 1581 it.Next(); 1582 } 1583 // Process methods 1584 size_t class_def_method_index = 0; 1585 while (it.HasNextDirectMethod()) { 1586 if (it.GetMemberIndex() == method_idx) { 1587 return class_def_method_index; 1588 } 1589 class_def_method_index++; 1590 it.Next(); 1591 } 1592 while (it.HasNextVirtualMethod()) { 1593 if (it.GetMemberIndex() == method_idx) { 1594 return class_def_method_index; 1595 } 1596 class_def_method_index++; 1597 it.Next(); 1598 } 1599 DCHECK(!it.HasNext()); 1600 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1601 return 0; 1602} 1603 1604const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1605 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1606 // method for direct methods (or virtual methods made direct). 1607 mirror::Class* declaring_class = method->GetDeclaringClass(); 1608 size_t oat_method_index; 1609 if (method->IsStatic() || method->IsDirect()) { 1610 // Simple case where the oat method index was stashed at load time. 1611 oat_method_index = method->GetMethodIndex(); 1612 } else { 1613 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1614 // by search for its position in the declared virtual methods. 1615 oat_method_index = declaring_class->NumDirectMethods(); 1616 size_t end = declaring_class->NumVirtualMethods(); 1617 bool found = false; 1618 for (size_t i = 0; i < end; i++) { 1619 if (declaring_class->GetVirtualMethod(i) == method) { 1620 found = true; 1621 break; 1622 } 1623 oat_method_index++; 1624 } 1625 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1626 } 1627 DCHECK_EQ(oat_method_index, 1628 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1629 method->GetDeclaringClass()->GetDexClassDefIndex(), 1630 method->GetDexMethodIndex())); 1631 const OatFile::OatClass oat_class = GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1632 declaring_class->GetDexClassDefIndex()); 1633 1634 return oat_class.GetOatMethod(oat_method_index); 1635} 1636 1637// Special case to get oat code without overwriting a trampoline. 1638const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1639 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1640 if (method->IsProxyMethod()) { 1641 return GetQuickProxyInvokeHandler(); 1642 } 1643 const void* result = GetOatMethodFor(method).GetQuickCode(); 1644 if (result == nullptr) { 1645 if (method->IsNative()) { 1646 // No code and native? Use generic trampoline. 1647 result = GetQuickGenericJniTrampoline(); 1648 } else if (method->IsPortableCompiled()) { 1649 // No code? Do we expect portable code? 1650 result = GetQuickToPortableBridge(); 1651 } else { 1652 // No code? You must mean to go into the interpreter. 1653 result = GetQuickToInterpreterBridge(); 1654 } 1655 } 1656 return result; 1657} 1658 1659const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1660 bool* have_portable_code) { 1661 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1662 *have_portable_code = false; 1663 if (method->IsProxyMethod()) { 1664 return GetPortableProxyInvokeHandler(); 1665 } 1666 const OatFile::OatMethod oat_method = GetOatMethodFor(method); 1667 const void* result = oat_method.GetPortableCode(); 1668 if (result == nullptr) { 1669 if (oat_method.GetQuickCode() == nullptr) { 1670 // No code? You must mean to go into the interpreter. 1671 result = GetPortableToInterpreterBridge(); 1672 } else { 1673 // No code? But there's quick code, so use a bridge. 1674 result = GetPortableToQuickBridge(); 1675 } 1676 } else { 1677 *have_portable_code = true; 1678 } 1679 return result; 1680} 1681 1682const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1683 uint32_t method_idx) { 1684 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1685 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1686 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 1687} 1688 1689const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1690 uint32_t method_idx) { 1691 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1692 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1693 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 1694} 1695 1696// Returns true if the method must run with interpreter, false otherwise. 1697static bool NeedsInterpreter(mirror::ArtMethod* method, const void* quick_code, 1698 const void* portable_code) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1699 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1700 // No code: need interpreter. 1701 // May return true for native code, in the case of generic JNI 1702 // DCHECK(!method->IsNative()); 1703 return true; 1704 } 1705#ifdef ART_SEA_IR_MODE 1706 ScopedObjectAccess soa(Thread::Current()); 1707 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1708 LOG(INFO) << "Found " << PrettyMethod(method); 1709 return false; 1710 } 1711#endif 1712 // If interpreter mode is enabled, every method (except native and proxy) must 1713 // be run with interpreter. 1714 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1715 !method->IsNative() && !method->IsProxyMethod(); 1716} 1717 1718void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1719 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1720 if (klass->NumDirectMethods() == 0) { 1721 return; // No direct methods => no static methods. 1722 } 1723 Runtime* runtime = Runtime::Current(); 1724 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1725 return; // OAT file unavailable. 1726 } 1727 ClassHelper kh(klass); 1728 const DexFile& dex_file = kh.GetDexFile(); 1729 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 1730 CHECK(dex_class_def != nullptr); 1731 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1732 // There should always be class data if there were direct methods. 1733 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1734 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 1735 ClassDataItemIterator it(dex_file, class_data); 1736 // Skip fields 1737 while (it.HasNextStaticField()) { 1738 it.Next(); 1739 } 1740 while (it.HasNextInstanceField()) { 1741 it.Next(); 1742 } 1743 // Link the code of methods skipped by LinkCode. 1744 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1745 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1746 if (!method->IsStatic()) { 1747 // Only update static methods. 1748 continue; 1749 } 1750 const void* portable_code = oat_class.GetOatMethod(method_index).GetPortableCode(); 1751 const void* quick_code = oat_class.GetOatMethod(method_index).GetQuickCode(); 1752 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1753 bool have_portable_code = false; 1754 if (enter_interpreter) { 1755 // Use interpreter entry point. 1756 // Check whether the method is native, in which case it's generic JNI. 1757 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 1758 quick_code = GetQuickGenericJniTrampoline(); 1759 portable_code = GetPortableToQuickBridge(); 1760 } else { 1761 portable_code = GetPortableToInterpreterBridge(); 1762 quick_code = GetQuickToInterpreterBridge(); 1763 } 1764 } else { 1765 if (portable_code == nullptr) { 1766 portable_code = GetPortableToQuickBridge(); 1767 } else { 1768 have_portable_code = true; 1769 } 1770 if (quick_code == nullptr) { 1771 quick_code = GetQuickToPortableBridge(); 1772 } 1773 } 1774 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1775 have_portable_code); 1776 } 1777 // Ignore virtual methods on the iterator. 1778} 1779 1780static void LinkCode(const Handle<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class, 1781 const DexFile& dex_file, uint32_t dex_method_index, uint32_t method_index) 1782 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1783 // Method shouldn't have already been linked. 1784 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1785 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1786 // Every kind of method should at least get an invoke stub from the oat_method. 1787 // non-abstract methods also get their code pointers. 1788 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1789 oat_method.LinkMethod(method.Get()); 1790 1791 // Install entry point from interpreter. 1792 Runtime* runtime = Runtime::Current(); 1793 bool enter_interpreter = NeedsInterpreter(method.Get(), 1794 method->GetEntryPointFromQuickCompiledCode(), 1795 method->GetEntryPointFromPortableCompiledCode()); 1796 if (enter_interpreter && !method->IsNative()) { 1797 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1798 } else { 1799 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1800 } 1801 1802 if (method->IsAbstract()) { 1803 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1804 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1805 return; 1806 } 1807 1808 bool have_portable_code = false; 1809 if (method->IsStatic() && !method->IsConstructor()) { 1810 // For static methods excluding the class initializer, install the trampoline. 1811 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1812 // after initializing class (see ClassLinker::InitializeClass method). 1813 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline(runtime->GetClassLinker())); 1814 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline(runtime->GetClassLinker())); 1815 } else if (enter_interpreter) { 1816 if (!method->IsNative()) { 1817 // Set entry point from compiled code if there's no code or in interpreter only mode. 1818 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1819 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1820 } else { 1821 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 1822 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1823 } 1824 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1825 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1826 have_portable_code = true; 1827 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1828 } else { 1829 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1830 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1831 } 1832 1833 if (method->IsNative()) { 1834 // Unregistering restores the dlsym lookup stub. 1835 method->UnregisterNative(Thread::Current()); 1836 1837 if (enter_interpreter) { 1838 // We have a native method here without code. Then it should have either the GenericJni 1839 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 1840 DCHECK(method->GetEntryPointFromQuickCompiledCode() == 1841 GetQuickResolutionTrampoline(runtime->GetClassLinker()) 1842 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 1843 } 1844 } 1845 1846 // Allow instrumentation its chance to hijack code. 1847 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 1848 method->GetEntryPointFromQuickCompiledCode(), 1849 method->GetEntryPointFromPortableCompiledCode(), 1850 have_portable_code); 1851} 1852 1853void ClassLinker::LoadClass(const DexFile& dex_file, 1854 const DexFile::ClassDef& dex_class_def, 1855 const Handle<mirror::Class>& klass, 1856 mirror::ClassLoader* class_loader) { 1857 CHECK(klass.Get() != NULL); 1858 CHECK(klass->GetDexCache() != NULL); 1859 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1860 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1861 CHECK(descriptor != NULL); 1862 1863 klass->SetClass(GetClassRoot(kJavaLangClass)); 1864 if (kUseBakerOrBrooksReadBarrier) { 1865 klass->AssertReadBarrierPointer(); 1866 } 1867 uint32_t access_flags = dex_class_def.access_flags_; 1868 // Make sure that none of our runtime-only flags are set. 1869 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1870 klass->SetAccessFlags(access_flags); 1871 klass->SetClassLoader(class_loader); 1872 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1873 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1874 1875 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1876 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1877 1878 const byte* class_data = dex_file.GetClassData(dex_class_def); 1879 if (class_data == NULL) { 1880 return; // no fields or methods - for example a marker interface 1881 } 1882 1883 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1884 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 1885 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 1886 } else { 1887 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 1888 } 1889} 1890 1891void ClassLinker::LoadClassMembers(const DexFile& dex_file, 1892 const byte* class_data, 1893 const Handle<mirror::Class>& klass, 1894 mirror::ClassLoader* class_loader, 1895 const OatFile::OatClass* oat_class) { 1896 // Load fields. 1897 ClassDataItemIterator it(dex_file, class_data); 1898 Thread* self = Thread::Current(); 1899 if (it.NumStaticFields() != 0) { 1900 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1901 if (UNLIKELY(statics == NULL)) { 1902 CHECK(self->IsExceptionPending()); // OOME. 1903 return; 1904 } 1905 klass->SetSFields(statics); 1906 } 1907 if (it.NumInstanceFields() != 0) { 1908 mirror::ObjectArray<mirror::ArtField>* fields = 1909 AllocArtFieldArray(self, it.NumInstanceFields()); 1910 if (UNLIKELY(fields == NULL)) { 1911 CHECK(self->IsExceptionPending()); // OOME. 1912 return; 1913 } 1914 klass->SetIFields(fields); 1915 } 1916 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1917 StackHandleScope<1> hs(self); 1918 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 1919 if (UNLIKELY(sfield.Get() == NULL)) { 1920 CHECK(self->IsExceptionPending()); // OOME. 1921 return; 1922 } 1923 klass->SetStaticField(i, sfield.Get()); 1924 LoadField(dex_file, it, klass, sfield); 1925 } 1926 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1927 StackHandleScope<1> hs(self); 1928 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 1929 if (UNLIKELY(ifield.Get() == NULL)) { 1930 CHECK(self->IsExceptionPending()); // OOME. 1931 return; 1932 } 1933 klass->SetInstanceField(i, ifield.Get()); 1934 LoadField(dex_file, it, klass, ifield); 1935 } 1936 1937 // Load methods. 1938 if (it.NumDirectMethods() != 0) { 1939 // TODO: append direct methods to class object 1940 mirror::ObjectArray<mirror::ArtMethod>* directs = 1941 AllocArtMethodArray(self, it.NumDirectMethods()); 1942 if (UNLIKELY(directs == NULL)) { 1943 CHECK(self->IsExceptionPending()); // OOME. 1944 return; 1945 } 1946 klass->SetDirectMethods(directs); 1947 } 1948 if (it.NumVirtualMethods() != 0) { 1949 // TODO: append direct methods to class object 1950 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1951 AllocArtMethodArray(self, it.NumVirtualMethods()); 1952 if (UNLIKELY(virtuals == NULL)) { 1953 CHECK(self->IsExceptionPending()); // OOME. 1954 return; 1955 } 1956 klass->SetVirtualMethods(virtuals); 1957 } 1958 size_t class_def_method_index = 0; 1959 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1960 StackHandleScope<1> hs(self); 1961 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 1962 if (UNLIKELY(method.Get() == NULL)) { 1963 CHECK(self->IsExceptionPending()); // OOME. 1964 return; 1965 } 1966 klass->SetDirectMethod(i, method.Get()); 1967 if (oat_class != nullptr) { 1968 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 1969 } 1970 method->SetMethodIndex(class_def_method_index); 1971 class_def_method_index++; 1972 } 1973 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1974 StackHandleScope<1> hs(self); 1975 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 1976 if (UNLIKELY(method.Get() == NULL)) { 1977 CHECK(self->IsExceptionPending()); // OOME. 1978 return; 1979 } 1980 klass->SetVirtualMethod(i, method.Get()); 1981 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1982 if (oat_class != nullptr) { 1983 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 1984 } 1985 class_def_method_index++; 1986 } 1987 DCHECK(!it.HasNext()); 1988} 1989 1990void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1991 const Handle<mirror::Class>& klass, 1992 const Handle<mirror::ArtField>& dst) { 1993 uint32_t field_idx = it.GetMemberIndex(); 1994 dst->SetDexFieldIndex(field_idx); 1995 dst->SetDeclaringClass(klass.Get()); 1996 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1997} 1998 1999mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2000 const ClassDataItemIterator& it, 2001 const Handle<mirror::Class>& klass) { 2002 uint32_t dex_method_idx = it.GetMemberIndex(); 2003 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2004 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2005 2006 mirror::ArtMethod* dst = AllocArtMethod(self); 2007 if (UNLIKELY(dst == NULL)) { 2008 CHECK(self->IsExceptionPending()); // OOME. 2009 return NULL; 2010 } 2011 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2012 2013 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2014 dst->SetDexMethodIndex(dex_method_idx); 2015 dst->SetDeclaringClass(klass.Get()); 2016 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2017 2018 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2019 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2020 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2021 2022 uint32_t access_flags = it.GetMemberAccessFlags(); 2023 2024 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2025 // Set finalizable flag on declaring class. 2026 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2027 // Void return type. 2028 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 2029 klass->SetFinalizable(); 2030 } else { 2031 ClassHelper kh(klass.Get()); 2032 const char* klass_descriptor = kh.GetDescriptor(); 2033 // The Enum class declares a "final" finalize() method to prevent subclasses from 2034 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2035 // subclasses, so we exclude it here. 2036 // We also want to avoid setting the flag on Object, where we know that finalize() is 2037 // empty. 2038 if ((strcmp("Ljava/lang/Object;", klass_descriptor) != 0) && 2039 (strcmp("Ljava/lang/Enum;", klass_descriptor) != 0)) { 2040 klass->SetFinalizable(); 2041 } 2042 } 2043 } 2044 } else if (method_name[0] == '<') { 2045 // Fix broken access flags for initializers. Bug 11157540. 2046 bool is_init = (strcmp("<init>", method_name) == 0); 2047 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2048 if (UNLIKELY(!is_init && !is_clinit)) { 2049 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2050 } else { 2051 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2052 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2053 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2054 access_flags |= kAccConstructor; 2055 } 2056 } 2057 } 2058 dst->SetAccessFlags(access_flags); 2059 2060 self->EndAssertNoThreadSuspension(old_cause); 2061 return dst; 2062} 2063 2064void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2065 Thread* self = Thread::Current(); 2066 StackHandleScope<1> hs(self); 2067 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2068 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2069 AppendToBootClassPath(dex_file, dex_cache); 2070} 2071 2072void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2073 const Handle<mirror::DexCache>& dex_cache) { 2074 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2075 boot_class_path_.push_back(&dex_file); 2076 RegisterDexFile(dex_file, dex_cache); 2077} 2078 2079bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 2080 dex_lock_.AssertSharedHeld(Thread::Current()); 2081 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2082 if (dex_caches_[i]->GetDexFile() == &dex_file) { 2083 return true; 2084 } 2085 } 2086 return false; 2087} 2088 2089bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 2090 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2091 return IsDexFileRegisteredLocked(dex_file); 2092} 2093 2094void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2095 const Handle<mirror::DexCache>& dex_cache) { 2096 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2097 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2098 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2099 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2100 dex_caches_.push_back(dex_cache.Get()); 2101 dex_cache->SetDexFile(&dex_file); 2102 if (log_new_dex_caches_roots_) { 2103 // TODO: This is not safe if we can remove dex caches. 2104 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2105 } 2106} 2107 2108void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2109 Thread* self = Thread::Current(); 2110 { 2111 ReaderMutexLock mu(self, dex_lock_); 2112 if (IsDexFileRegisteredLocked(dex_file)) { 2113 return; 2114 } 2115 } 2116 // Don't alloc while holding the lock, since allocation may need to 2117 // suspend all threads and another thread may need the dex_lock_ to 2118 // get to a suspend point. 2119 StackHandleScope<1> hs(self); 2120 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2121 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2122 { 2123 WriterMutexLock mu(self, dex_lock_); 2124 if (IsDexFileRegisteredLocked(dex_file)) { 2125 return; 2126 } 2127 RegisterDexFileLocked(dex_file, dex_cache); 2128 } 2129} 2130 2131void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2132 const Handle<mirror::DexCache>& dex_cache) { 2133 WriterMutexLock mu(Thread::Current(), dex_lock_); 2134 RegisterDexFileLocked(dex_file, dex_cache); 2135} 2136 2137mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 2138 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2139 // Search assuming unique-ness of dex file. 2140 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2141 mirror::DexCache* dex_cache = dex_caches_[i]; 2142 if (dex_cache->GetDexFile() == &dex_file) { 2143 return dex_cache; 2144 } 2145 } 2146 // Search matching by location name. 2147 std::string location(dex_file.GetLocation()); 2148 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2149 mirror::DexCache* dex_cache = dex_caches_[i]; 2150 if (dex_cache->GetDexFile()->GetLocation() == location) { 2151 return dex_cache; 2152 } 2153 } 2154 // Failure, dump diagnostic and abort. 2155 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2156 mirror::DexCache* dex_cache = dex_caches_[i]; 2157 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2158 } 2159 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2160 return NULL; 2161} 2162 2163void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 2164 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2165 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2166 dex_caches_[i]->Fixup(resolution_method); 2167 } 2168} 2169 2170mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2171 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2172 if (UNLIKELY(klass == NULL)) { 2173 return NULL; 2174 } 2175 return InitializePrimitiveClass(klass, type); 2176} 2177 2178mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2179 Primitive::Type type) { 2180 CHECK(primitive_class != NULL); 2181 // Must hold lock on object when initializing. 2182 Thread* self = Thread::Current(); 2183 StackHandleScope<1> hs(self); 2184 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2185 ObjectLock<mirror::Class> lock(self, h_class); 2186 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2187 primitive_class->SetPrimitiveType(type); 2188 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2189 const char* descriptor = Primitive::Descriptor(type); 2190 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2191 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2192 return primitive_class; 2193} 2194 2195// Create an array class (i.e. the class object for the array, not the 2196// array itself). "descriptor" looks like "[C" or "[[[[B" or 2197// "[Ljava/lang/String;". 2198// 2199// If "descriptor" refers to an array of primitives, look up the 2200// primitive type's internally-generated class object. 2201// 2202// "class_loader" is the class loader of the class that's referring to 2203// us. It's used to ensure that we're looking for the element type in 2204// the right context. It does NOT become the class loader for the 2205// array class; that always comes from the base element class. 2206// 2207// Returns NULL with an exception raised on failure. 2208mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2209 const Handle<mirror::ClassLoader>& class_loader) { 2210 // Identify the underlying component type 2211 CHECK_EQ('[', descriptor[0]); 2212 StackHandleScope<2> hs(self); 2213 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2214 if (component_type.Get() == nullptr) { 2215 DCHECK(self->IsExceptionPending()); 2216 return nullptr; 2217 } 2218 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2219 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2220 return nullptr; 2221 } 2222 // See if the component type is already loaded. Array classes are 2223 // always associated with the class loader of their underlying 2224 // element type -- an array of Strings goes with the loader for 2225 // java/lang/String -- so we need to look for it there. (The 2226 // caller should have checked for the existence of the class 2227 // before calling here, but they did so with *their* class loader, 2228 // not the component type's loader.) 2229 // 2230 // If we find it, the caller adds "loader" to the class' initiating 2231 // loader list, which should prevent us from going through this again. 2232 // 2233 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2234 // are the same, because our caller (FindClass) just did the 2235 // lookup. (Even if we get this wrong we still have correct behavior, 2236 // because we effectively do this lookup again when we add the new 2237 // class to the hash table --- necessary because of possible races with 2238 // other threads.) 2239 if (class_loader.Get() != component_type->GetClassLoader()) { 2240 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2241 if (new_class != NULL) { 2242 return new_class; 2243 } 2244 } 2245 2246 // Fill out the fields in the Class. 2247 // 2248 // It is possible to execute some methods against arrays, because 2249 // all arrays are subclasses of java_lang_Object_, so we need to set 2250 // up a vtable. We can just point at the one in java_lang_Object_. 2251 // 2252 // Array classes are simple enough that we don't need to do a full 2253 // link step. 2254 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2255 if (UNLIKELY(!init_done_)) { 2256 // Classes that were hand created, ie not by FindSystemClass 2257 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2258 new_class.Assign(GetClassRoot(kClassArrayClass)); 2259 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2260 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2261 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2262 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2263 } else if (strcmp(descriptor, 2264 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2265 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2266 } else if (strcmp(descriptor, 2267 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2268 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2269 } else if (strcmp(descriptor, "[C") == 0) { 2270 new_class.Assign(GetClassRoot(kCharArrayClass)); 2271 } else if (strcmp(descriptor, "[I") == 0) { 2272 new_class.Assign(GetClassRoot(kIntArrayClass)); 2273 } 2274 } 2275 if (new_class.Get() == nullptr) { 2276 new_class.Assign(AllocClass(self, sizeof(mirror::Class))); 2277 if (new_class.Get() == nullptr) { 2278 return nullptr; 2279 } 2280 new_class->SetComponentType(component_type.Get()); 2281 } 2282 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2283 DCHECK(new_class->GetComponentType() != NULL); 2284 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2285 new_class->SetSuperClass(java_lang_Object); 2286 new_class->SetVTable(java_lang_Object->GetVTable()); 2287 new_class->SetPrimitiveType(Primitive::kPrimNot); 2288 new_class->SetClassLoader(component_type->GetClassLoader()); 2289 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2290 // don't need to set new_class->SetObjectSize(..) 2291 // because Object::SizeOf delegates to Array::SizeOf 2292 2293 2294 // All arrays have java/lang/Cloneable and java/io/Serializable as 2295 // interfaces. We need to set that up here, so that stuff like 2296 // "instanceof" works right. 2297 // 2298 // Note: The GC could run during the call to FindSystemClass, 2299 // so we need to make sure the class object is GC-valid while we're in 2300 // there. Do this by clearing the interface list so the GC will just 2301 // think that the entries are null. 2302 2303 2304 // Use the single, global copies of "interfaces" and "iftable" 2305 // (remember not to free them for arrays). 2306 CHECK(array_iftable_ != nullptr); 2307 new_class->SetIfTable(array_iftable_); 2308 2309 // Inherit access flags from the component type. 2310 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2311 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2312 access_flags &= kAccJavaFlagsMask; 2313 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2314 // and remove "interface". 2315 access_flags |= kAccAbstract | kAccFinal; 2316 access_flags &= ~kAccInterface; 2317 2318 new_class->SetAccessFlags(access_flags); 2319 2320 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2321 if (existing == nullptr) { 2322 return new_class.Get(); 2323 } 2324 // Another thread must have loaded the class after we 2325 // started but before we finished. Abandon what we've 2326 // done. 2327 // 2328 // (Yes, this happens.) 2329 2330 return existing; 2331} 2332 2333mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2334 switch (type) { 2335 case 'B': 2336 return GetClassRoot(kPrimitiveByte); 2337 case 'C': 2338 return GetClassRoot(kPrimitiveChar); 2339 case 'D': 2340 return GetClassRoot(kPrimitiveDouble); 2341 case 'F': 2342 return GetClassRoot(kPrimitiveFloat); 2343 case 'I': 2344 return GetClassRoot(kPrimitiveInt); 2345 case 'J': 2346 return GetClassRoot(kPrimitiveLong); 2347 case 'S': 2348 return GetClassRoot(kPrimitiveShort); 2349 case 'Z': 2350 return GetClassRoot(kPrimitiveBoolean); 2351 case 'V': 2352 return GetClassRoot(kPrimitiveVoid); 2353 default: 2354 break; 2355 } 2356 std::string printable_type(PrintableChar(type)); 2357 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2358 return NULL; 2359} 2360 2361mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2362 size_t hash) { 2363 if (VLOG_IS_ON(class_linker)) { 2364 mirror::DexCache* dex_cache = klass->GetDexCache(); 2365 std::string source; 2366 if (dex_cache != NULL) { 2367 source += " from "; 2368 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2369 } 2370 LOG(INFO) << "Loaded class " << descriptor << source; 2371 } 2372 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2373 mirror::Class* existing = 2374 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2375 if (existing != NULL) { 2376 return existing; 2377 } 2378 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2379 // Check a class loaded with the system class loader matches one in the image if the class 2380 // is in the image. 2381 existing = LookupClassFromImage(descriptor); 2382 if (existing != NULL) { 2383 CHECK(klass == existing); 2384 } 2385 } 2386 VerifyObject(klass); 2387 class_table_.insert(std::make_pair(hash, klass)); 2388 if (log_new_class_table_roots_) { 2389 new_class_roots_.push_back(std::make_pair(hash, klass)); 2390 } 2391 return NULL; 2392} 2393 2394bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2395 size_t hash = Hash(descriptor); 2396 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2397 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2398 ++it) { 2399 mirror::Class* klass = it->second; 2400 ClassHelper kh(klass); 2401 if ((klass->GetClassLoader() == class_loader) && 2402 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2403 class_table_.erase(it); 2404 return true; 2405 } 2406 } 2407 return false; 2408} 2409 2410mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2411 const mirror::ClassLoader* class_loader) { 2412 size_t hash = Hash(descriptor); 2413 { 2414 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2415 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2416 if (result != NULL) { 2417 return result; 2418 } 2419 } 2420 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2421 return NULL; 2422 } else { 2423 // Lookup failed but need to search dex_caches_. 2424 mirror::Class* result = LookupClassFromImage(descriptor); 2425 if (result != NULL) { 2426 InsertClass(descriptor, result, hash); 2427 } else { 2428 // Searching the image dex files/caches failed, we don't want to get into this situation 2429 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2430 // classes into the class table. 2431 const int32_t kMaxFailedDexCacheLookups = 1000; 2432 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2433 MoveImageClassesToClassTable(); 2434 } 2435 } 2436 return result; 2437 } 2438} 2439 2440mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2441 const mirror::ClassLoader* class_loader, 2442 size_t hash) { 2443 auto end = class_table_.end(); 2444 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2445 mirror::Class* klass = it->second; 2446 ClassHelper kh(klass); 2447 if ((klass->GetClassLoader() == class_loader) && 2448 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2449 if (kIsDebugBuild) { 2450 // Check for duplicates in the table. 2451 for (++it; it != end && it->first == hash; ++it) { 2452 mirror::Class* klass2 = it->second; 2453 ClassHelper kh(klass2); 2454 CHECK(!((klass2->GetClassLoader() == class_loader) && 2455 (strcmp(descriptor, kh.GetDescriptor()) == 0))) 2456 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2457 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2458 } 2459 } 2460 return klass; 2461 } 2462 } 2463 return NULL; 2464} 2465 2466static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2467 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2468 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2469 CHECK(image != NULL); 2470 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2471 return root->AsObjectArray<mirror::DexCache>(); 2472} 2473 2474void ClassLinker::MoveImageClassesToClassTable() { 2475 Thread* self = Thread::Current(); 2476 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2477 if (!dex_cache_image_class_lookup_required_) { 2478 return; // All dex cache classes are already in the class table. 2479 } 2480 const char* old_no_suspend_cause = 2481 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 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 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2486 for (int32_t j = 0; j < types->GetLength(); j++) { 2487 mirror::Class* klass = types->Get(j); 2488 if (klass != NULL) { 2489 ClassHelper kh(klass); 2490 DCHECK(klass->GetClassLoader() == NULL); 2491 const char* descriptor = kh.GetDescriptor(); 2492 size_t hash = Hash(descriptor); 2493 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 2494 if (existing != NULL) { 2495 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2496 << PrettyClassAndClassLoader(klass); 2497 } else { 2498 class_table_.insert(std::make_pair(hash, klass)); 2499 if (log_new_class_table_roots_) { 2500 new_class_roots_.push_back(std::make_pair(hash, klass)); 2501 } 2502 } 2503 } 2504 } 2505 } 2506 dex_cache_image_class_lookup_required_ = false; 2507 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2508} 2509 2510mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2511 Thread* self = Thread::Current(); 2512 const char* old_no_suspend_cause = 2513 self->StartAssertNoThreadSuspension("Image class lookup"); 2514 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2515 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2516 mirror::DexCache* dex_cache = dex_caches->Get(i); 2517 const DexFile* dex_file = dex_cache->GetDexFile(); 2518 // Try binary searching the string/type index. 2519 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2520 if (string_id != NULL) { 2521 const DexFile::TypeId* type_id = 2522 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2523 if (type_id != NULL) { 2524 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2525 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2526 if (klass != NULL) { 2527 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2528 return klass; 2529 } 2530 } 2531 } 2532 } 2533 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2534 return NULL; 2535} 2536 2537void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2538 result.clear(); 2539 if (dex_cache_image_class_lookup_required_) { 2540 MoveImageClassesToClassTable(); 2541 } 2542 size_t hash = Hash(descriptor); 2543 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2544 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2545 it != end && it->first == hash; ++it) { 2546 mirror::Class* klass = it->second; 2547 ClassHelper kh(klass); 2548 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2549 result.push_back(klass); 2550 } 2551 } 2552} 2553 2554void ClassLinker::VerifyClass(const Handle<mirror::Class>& klass) { 2555 // TODO: assert that the monitor on the Class is held 2556 Thread* self = Thread::Current(); 2557 ObjectLock<mirror::Class> lock(self, klass); 2558 2559 // Don't attempt to re-verify if already sufficiently verified. 2560 if (klass->IsVerified() || 2561 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2562 return; 2563 } 2564 2565 // The class might already be erroneous, for example at compile time if we attempted to verify 2566 // this class as a parent to another. 2567 if (klass->IsErroneous()) { 2568 ThrowEarlierClassFailure(klass.Get()); 2569 return; 2570 } 2571 2572 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2573 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2574 } else { 2575 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2576 << PrettyClass(klass.Get()); 2577 CHECK(!Runtime::Current()->IsCompiler()); 2578 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2579 } 2580 2581 // Skip verification if disabled. 2582 if (!Runtime::Current()->IsVerificationEnabled()) { 2583 klass->SetStatus(mirror::Class::kStatusVerified, self); 2584 return; 2585 } 2586 2587 // Verify super class. 2588 StackHandleScope<2> hs(self); 2589 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 2590 if (super.Get() != NULL) { 2591 // Acquire lock to prevent races on verifying the super class. 2592 ObjectLock<mirror::Class> lock(self, super); 2593 2594 if (!super->IsVerified() && !super->IsErroneous()) { 2595 VerifyClass(super); 2596 } 2597 if (!super->IsCompileTimeVerified()) { 2598 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2599 PrettyDescriptor(klass.Get()).c_str(), 2600 PrettyDescriptor(super.Get()).c_str())); 2601 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2602 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 2603 if (cause.Get() != nullptr) { 2604 self->ClearException(); 2605 } 2606 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2607 if (cause.Get() != nullptr) { 2608 self->GetException(nullptr)->SetCause(cause.Get()); 2609 } 2610 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2611 if (Runtime::Current()->IsCompiler()) { 2612 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2613 } 2614 klass->SetStatus(mirror::Class::kStatusError, self); 2615 return; 2616 } 2617 } 2618 2619 // Try to use verification information from the oat file, otherwise do runtime verification. 2620 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2621 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2622 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 2623 if (oat_file_class_status == mirror::Class::kStatusError) { 2624 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2625 << PrettyDescriptor(klass.Get()) << " in " 2626 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2627 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 2628 PrettyDescriptor(klass.Get()).c_str()); 2629 klass->SetStatus(mirror::Class::kStatusError, self); 2630 return; 2631 } 2632 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2633 std::string error_msg; 2634 if (!preverified) { 2635 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 2636 Runtime::Current()->IsCompiler(), 2637 &error_msg); 2638 } 2639 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2640 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2641 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 2642 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2643 << " because: " << error_msg; 2644 } 2645 self->AssertNoPendingException(); 2646 // Make sure all classes referenced by catch blocks are resolved. 2647 ResolveClassExceptionHandlerTypes(dex_file, klass); 2648 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2649 // Even though there were no verifier failures we need to respect whether the super-class 2650 // was verified or requiring runtime reverification. 2651 if (super.Get() == NULL || super->IsVerified()) { 2652 klass->SetStatus(mirror::Class::kStatusVerified, self); 2653 } else { 2654 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2655 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2656 // Pretend a soft failure occured so that we don't consider the class verified below. 2657 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2658 } 2659 } else { 2660 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2661 // Soft failures at compile time should be retried at runtime. Soft 2662 // failures at runtime will be handled by slow paths in the generated 2663 // code. Set status accordingly. 2664 if (Runtime::Current()->IsCompiler()) { 2665 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2666 } else { 2667 klass->SetStatus(mirror::Class::kStatusVerified, self); 2668 } 2669 } 2670 } else { 2671 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 2672 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2673 << " because: " << error_msg; 2674 self->AssertNoPendingException(); 2675 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2676 klass->SetStatus(mirror::Class::kStatusError, self); 2677 } 2678 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2679 // Class is verified so we don't need to do any access check on its methods. 2680 // Let the interpreter know it by setting the kAccPreverified flag onto each 2681 // method. 2682 // Note: we're going here during compilation and at runtime. When we set the 2683 // kAccPreverified flag when compiling image classes, the flag is recorded 2684 // in the image and is set when loading the image. 2685 klass->SetPreverifiedFlagOnAllMethods(); 2686 } 2687} 2688 2689bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2690 mirror::Class::Status& oat_file_class_status) { 2691 // If we're compiling, we can only verify the class using the oat file if 2692 // we are not compiling the image or if the class we're verifying is not part of 2693 // the app. In other words, we will only check for preverification of bootclasspath 2694 // classes. 2695 if (Runtime::Current()->IsCompiler()) { 2696 // Are we compiling the bootclasspath? 2697 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2698 return false; 2699 } 2700 // We are compiling an app (not the image). 2701 2702 // Is this an app class? (I.e. not a bootclasspath class) 2703 if (klass->GetClassLoader() != NULL) { 2704 return false; 2705 } 2706 } 2707 2708 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2709 // Make this work with gtests, which do not set up the image properly. 2710 // TODO: we should clean up gtests to set up the image path properly. 2711 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2712 return false; 2713 } 2714 2715 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2716 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2717 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2718 &dex_location_checksum); 2719 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2720 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2721 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 2722 if (oat_file_class_status == mirror::Class::kStatusVerified || 2723 oat_file_class_status == mirror::Class::kStatusInitialized) { 2724 return true; 2725 } 2726 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2727 // Compile time verification failed with a soft error. Compile time verification can fail 2728 // because we have incomplete type information. Consider the following: 2729 // class ... { 2730 // Foo x; 2731 // .... () { 2732 // if (...) { 2733 // v1 gets assigned a type of resolved class Foo 2734 // } else { 2735 // v1 gets assigned a type of unresolved class Bar 2736 // } 2737 // iput x = v1 2738 // } } 2739 // when we merge v1 following the if-the-else it results in Conflict 2740 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2741 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2742 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2743 // at compile time). 2744 return false; 2745 } 2746 if (oat_file_class_status == mirror::Class::kStatusError) { 2747 // Compile time verification failed with a hard error. This is caused by invalid instructions 2748 // in the class. These errors are unrecoverable. 2749 return false; 2750 } 2751 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2752 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2753 // not loading the class. 2754 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2755 // isn't a problem and this case shouldn't occur 2756 return false; 2757 } 2758 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2759 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2760 << ClassHelper(klass).GetDescriptor(); 2761 2762 return false; 2763} 2764 2765void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2766 const Handle<mirror::Class>& klass) { 2767 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2768 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2769 } 2770 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2771 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2772 } 2773} 2774 2775void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2776 mirror::ArtMethod* method) { 2777 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2778 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2779 if (code_item == NULL) { 2780 return; // native or abstract method 2781 } 2782 if (code_item->tries_size_ == 0) { 2783 return; // nothing to process 2784 } 2785 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2786 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2787 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2788 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2789 CatchHandlerIterator iterator(handlers_ptr); 2790 for (; iterator.HasNext(); iterator.Next()) { 2791 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2792 // unresolved exception types will be ignored by exception delivery 2793 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2794 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2795 if (exception_type == NULL) { 2796 DCHECK(Thread::Current()->IsExceptionPending()); 2797 Thread::Current()->ClearException(); 2798 } 2799 } 2800 } 2801 handlers_ptr = iterator.EndDataPointer(); 2802 } 2803} 2804 2805static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2806static void CheckProxyMethod(mirror::ArtMethod* method, 2807 Handle<mirror::ArtMethod>& prototype); 2808 2809mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccess& soa, jstring name, 2810 jobjectArray interfaces, jobject loader, 2811 jobjectArray methods, jobjectArray throws) { 2812 Thread* self = soa.Self(); 2813 StackHandleScope<8> hs(self); 2814 Handle<mirror::Class> klass(hs.NewHandle(AllocClass(self, GetClassRoot(kJavaLangClass), 2815 sizeof(mirror::SynthesizedProxyClass)))); 2816 if (klass.Get() == NULL) { 2817 CHECK(self->IsExceptionPending()); // OOME. 2818 return NULL; 2819 } 2820 DCHECK(klass->GetClass() != NULL); 2821 klass->SetObjectSize(sizeof(mirror::Proxy)); 2822 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2823 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2824 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2825 klass->SetName(soa.Decode<mirror::String*>(name)); 2826 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2827 klass->SetDexCache(proxy_class->GetDexCache()); 2828 klass->SetStatus(mirror::Class::kStatusIdx, self); 2829 2830 // Instance fields are inherited, but we add a couple of static fields... 2831 { 2832 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2833 if (UNLIKELY(sfields == NULL)) { 2834 CHECK(self->IsExceptionPending()); // OOME. 2835 return NULL; 2836 } 2837 klass->SetSFields(sfields); 2838 } 2839 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2840 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2841 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 2842 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 2843 CHECK(self->IsExceptionPending()); // OOME. 2844 return nullptr; 2845 } 2846 klass->SetStaticField(0, interfaces_sfield.Get()); 2847 interfaces_sfield->SetDexFieldIndex(0); 2848 interfaces_sfield->SetDeclaringClass(klass.Get()); 2849 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2850 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2851 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 2852 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 2853 CHECK(self->IsExceptionPending()); // OOME. 2854 return nullptr; 2855 } 2856 klass->SetStaticField(1, throws_sfield.Get()); 2857 throws_sfield->SetDexFieldIndex(1); 2858 throws_sfield->SetDeclaringClass(klass.Get()); 2859 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2860 2861 // Proxies have 1 direct method, the constructor 2862 { 2863 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 2864 if (UNLIKELY(directs == nullptr)) { 2865 CHECK(self->IsExceptionPending()); // OOME. 2866 return nullptr; 2867 } 2868 klass->SetDirectMethods(directs); 2869 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2870 if (UNLIKELY(constructor == nullptr)) { 2871 CHECK(self->IsExceptionPending()); // OOME. 2872 return nullptr; 2873 } 2874 klass->SetDirectMethod(0, constructor); 2875 } 2876 2877 // Create virtual method using specified prototypes. 2878 size_t num_virtual_methods = 2879 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 2880 { 2881 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, num_virtual_methods); 2882 if (UNLIKELY(virtuals == NULL)) { 2883 CHECK(self->IsExceptionPending()); // OOME. 2884 return NULL; 2885 } 2886 klass->SetVirtualMethods(virtuals); 2887 } 2888 for (size_t i = 0; i < num_virtual_methods; ++i) { 2889 StackHandleScope<1> hs(self); 2890 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2891 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2892 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 2893 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2894 if (UNLIKELY(clone == nullptr)) { 2895 CHECK(self->IsExceptionPending()); // OOME. 2896 return nullptr; 2897 } 2898 klass->SetVirtualMethod(i, clone); 2899 } 2900 2901 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2902 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Class is now effectively in the loaded state 2903 self->AssertNoPendingException(); 2904 2905 { 2906 ObjectLock<mirror::Class> lock(self, klass); // Must hold lock on object when resolved. 2907 // Link the fields and virtual methods, creating vtable and iftables 2908 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 2909 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 2910 if (!LinkClass(self, klass, h_interfaces)) { 2911 klass->SetStatus(mirror::Class::kStatusError, self); 2912 return nullptr; 2913 } 2914 2915 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2916 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2917 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2918 } 2919 2920 // sanity checks 2921 if (kIsDebugBuild) { 2922 CHECK(klass->GetIFields() == nullptr); 2923 CheckProxyConstructor(klass->GetDirectMethod(0)); 2924 for (size_t i = 0; i < num_virtual_methods; ++i) { 2925 StackHandleScope<1> hs(self); 2926 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2927 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2928 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 2929 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2930 } 2931 2932 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 2933 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2934 decoded_name->ToModifiedUtf8().c_str())); 2935 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2936 2937 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2938 decoded_name->ToModifiedUtf8().c_str())); 2939 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2940 2941 mirror::SynthesizedProxyClass* synth_proxy_class = 2942 down_cast<mirror::SynthesizedProxyClass*>(klass.Get()); 2943 CHECK_EQ(synth_proxy_class->GetInterfaces(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2944 CHECK_EQ(synth_proxy_class->GetThrows(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2945 } 2946 std::string descriptor(GetDescriptorForProxy(klass.Get())); 2947 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 2948 CHECK(existing == nullptr); 2949 return klass.Get(); 2950} 2951 2952std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 2953 DCHECK(proxy_class->IsProxyClass()); 2954 mirror::String* name = proxy_class->GetName(); 2955 DCHECK(name != NULL); 2956 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2957} 2958 2959mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 2960 mirror::ArtMethod* proxy_method) { 2961 DCHECK(proxy_class->IsProxyClass()); 2962 DCHECK(proxy_method->IsProxyMethod()); 2963 // Locate the dex cache of the original interface/Object 2964 mirror::DexCache* dex_cache = NULL; 2965 { 2966 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2967 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2968 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2969 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2970 dex_cache = dex_caches_[i]; 2971 break; 2972 } 2973 } 2974 } 2975 CHECK(dex_cache != NULL); 2976 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2977 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2978 CHECK(resolved_method != NULL); 2979 return resolved_method; 2980} 2981 2982 2983mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2984 const Handle<mirror::Class>& klass, 2985 mirror::Class* proxy_class) { 2986 // Create constructor for Proxy that must initialize h 2987 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2988 proxy_class->GetDirectMethods(); 2989 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2990 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2991 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2992 // code_ too) 2993 mirror::ArtMethod* constructor = 2994 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2995 if (constructor == NULL) { 2996 CHECK(self->IsExceptionPending()); // OOME. 2997 return NULL; 2998 } 2999 // Make this constructor public and fix the class to be our Proxy version 3000 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3001 constructor->SetDeclaringClass(klass.Get()); 3002 return constructor; 3003} 3004 3005static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3006 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3007 CHECK(constructor->IsConstructor()); 3008 MethodHelper mh(constructor); 3009 CHECK_STREQ(mh.GetName(), "<init>"); 3010 CHECK_STREQ(mh.GetSignature().ToString().c_str(), "(Ljava/lang/reflect/InvocationHandler;)V"); 3011 DCHECK(constructor->IsPublic()); 3012} 3013 3014mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3015 const Handle<mirror::Class>& klass, 3016 const Handle<mirror::ArtMethod>& prototype) { 3017 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3018 // prototype method 3019 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3020 prototype.Get()); 3021 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3022 // as necessary 3023 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3024 if (UNLIKELY(method == NULL)) { 3025 CHECK(self->IsExceptionPending()); // OOME. 3026 return NULL; 3027 } 3028 3029 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3030 // the intersection of throw exceptions as defined in Proxy 3031 method->SetDeclaringClass(klass.Get()); 3032 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3033 3034 // At runtime the method looks like a reference and argument saving method, clone the code 3035 // related parameters from this method. 3036 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3037 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3038 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3039 3040 return method; 3041} 3042 3043static void CheckProxyMethod(mirror::ArtMethod* method, 3044 Handle<mirror::ArtMethod>& prototype) 3045 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3046 // Basic sanity 3047 CHECK(!prototype->IsFinal()); 3048 CHECK(method->IsFinal()); 3049 CHECK(!method->IsAbstract()); 3050 3051 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3052 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3053 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3054 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 3055 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 3056 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3057 3058 MethodHelper mh(method); 3059 MethodHelper mh2(prototype.Get()); 3060 CHECK_STREQ(mh.GetName(), mh2.GetName()); 3061 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 3062 // More complex sanity - via dex cache 3063 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3064} 3065 3066static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3067 bool can_init_parents) 3068 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3069 if (can_init_statics && can_init_parents) { 3070 return true; 3071 } 3072 if (!can_init_statics) { 3073 // Check if there's a class initializer. 3074 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3075 if (clinit != NULL) { 3076 return false; 3077 } 3078 // Check if there are encoded static values needing initialization. 3079 if (klass->NumStaticFields() != 0) { 3080 ClassHelper kh(klass); 3081 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3082 DCHECK(dex_class_def != NULL); 3083 if (dex_class_def->static_values_off_ != 0) { 3084 return false; 3085 } 3086 } 3087 } 3088 if (!klass->IsInterface() && klass->HasSuperClass()) { 3089 mirror::Class* super_class = klass->GetSuperClass(); 3090 if (!can_init_parents && !super_class->IsInitialized()) { 3091 return false; 3092 } else { 3093 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3094 return false; 3095 } 3096 } 3097 } 3098 return true; 3099} 3100 3101bool ClassLinker::IsInitialized() const { 3102 return init_done_; 3103} 3104 3105bool ClassLinker::InitializeClass(const Handle<mirror::Class>& klass, bool can_init_statics, 3106 bool can_init_parents) { 3107 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3108 3109 // Are we already initialized and therefore done? 3110 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3111 // an initialized class will never change its state. 3112 if (klass->IsInitialized()) { 3113 return true; 3114 } 3115 3116 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3117 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3118 return false; 3119 } 3120 3121 Thread* self = Thread::Current(); 3122 uint64_t t0; 3123 { 3124 ObjectLock<mirror::Class> lock(self, klass); 3125 3126 // Re-check under the lock in case another thread initialized ahead of us. 3127 if (klass->IsInitialized()) { 3128 return true; 3129 } 3130 3131 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3132 if (klass->IsErroneous()) { 3133 ThrowEarlierClassFailure(klass.Get()); 3134 return false; 3135 } 3136 3137 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3138 3139 if (!klass->IsVerified()) { 3140 VerifyClass(klass); 3141 if (!klass->IsVerified()) { 3142 // We failed to verify, expect either the klass to be erroneous or verification failed at 3143 // compile time. 3144 if (klass->IsErroneous()) { 3145 CHECK(self->IsExceptionPending()); 3146 } else { 3147 CHECK(Runtime::Current()->IsCompiler()); 3148 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3149 } 3150 return false; 3151 } 3152 } 3153 3154 // If the class is kStatusInitializing, either this thread is 3155 // initializing higher up the stack or another thread has beat us 3156 // to initializing and we need to wait. Either way, this 3157 // invocation of InitializeClass will not be responsible for 3158 // running <clinit> and will return. 3159 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3160 // We caught somebody else in the act; was it us? 3161 if (klass->GetClinitThreadId() == self->GetTid()) { 3162 // Yes. That's fine. Return so we can continue initializing. 3163 return true; 3164 } 3165 // No. That's fine. Wait for another thread to finish initializing. 3166 return WaitForInitializeClass(klass, self, lock); 3167 } 3168 3169 if (!ValidateSuperClassDescriptors(klass)) { 3170 klass->SetStatus(mirror::Class::kStatusError, self); 3171 return false; 3172 } 3173 3174 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3175 3176 // From here out other threads may observe that we're initializing and so changes of state 3177 // require the a notification. 3178 klass->SetClinitThreadId(self->GetTid()); 3179 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3180 3181 t0 = NanoTime(); 3182 } 3183 3184 // Initialize super classes, must be done while initializing for the JLS. 3185 if (!klass->IsInterface() && klass->HasSuperClass()) { 3186 mirror::Class* super_class = klass->GetSuperClass(); 3187 if (!super_class->IsInitialized()) { 3188 CHECK(!super_class->IsInterface()); 3189 CHECK(can_init_parents); 3190 StackHandleScope<1> hs(self); 3191 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3192 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3193 if (!super_initialized) { 3194 // The super class was verified ahead of entering initializing, we should only be here if 3195 // the super class became erroneous due to initialization. 3196 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3197 << "Super class initialization failed for " << PrettyDescriptor(handle_scope_super.Get()) 3198 << " that has unexpected status " << handle_scope_super->GetStatus() 3199 << "\nPending exception:\n" 3200 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3201 ObjectLock<mirror::Class> lock(self, klass); 3202 // Initialization failed because the super-class is erroneous. 3203 klass->SetStatus(mirror::Class::kStatusError, self); 3204 return false; 3205 } 3206 } 3207 } 3208 3209 if (klass->NumStaticFields() > 0) { 3210 ClassHelper kh(klass.Get()); 3211 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3212 CHECK(dex_class_def != NULL); 3213 const DexFile& dex_file = kh.GetDexFile(); 3214 StackHandleScope<2> hs(self); 3215 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3216 Handle<mirror::DexCache> dex_cache(hs.NewHandle(kh.GetDexCache())); 3217 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3218 this, *dex_class_def); 3219 if (it.HasNext()) { 3220 CHECK(can_init_statics); 3221 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 3222 SafeMap<uint32_t, mirror::ArtField*> field_map; 3223 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3224 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3225 if (Runtime::Current()->IsActiveTransaction()) { 3226 it.ReadValueToField<true>(field_map.Get(i)); 3227 } else { 3228 it.ReadValueToField<false>(field_map.Get(i)); 3229 } 3230 } 3231 } 3232 } 3233 3234 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3235 if (clinit != NULL) { 3236 CHECK(can_init_statics); 3237 JValue result; 3238 clinit->Invoke(self, NULL, 0, &result, "V"); 3239 } 3240 3241 uint64_t t1 = NanoTime(); 3242 3243 bool success = true; 3244 { 3245 ObjectLock<mirror::Class> lock(self, klass); 3246 3247 if (self->IsExceptionPending()) { 3248 WrapExceptionInInitializer(); 3249 klass->SetStatus(mirror::Class::kStatusError, self); 3250 success = false; 3251 } else { 3252 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3253 RuntimeStats* thread_stats = self->GetStats(); 3254 ++global_stats->class_init_count; 3255 ++thread_stats->class_init_count; 3256 global_stats->class_init_time_ns += (t1 - t0); 3257 thread_stats->class_init_time_ns += (t1 - t0); 3258 // Set the class as initialized except if failed to initialize static fields. 3259 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3260 if (VLOG_IS_ON(class_linker)) { 3261 ClassHelper kh(klass.Get()); 3262 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 3263 } 3264 // Opportunistically set static method trampolines to their destination. 3265 FixupStaticTrampolines(klass.Get()); 3266 } 3267 } 3268 return success; 3269} 3270 3271bool ClassLinker::WaitForInitializeClass(const Handle<mirror::Class>& klass, Thread* self, 3272 ObjectLock<mirror::Class>& lock) 3273 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3274 while (true) { 3275 self->AssertNoPendingException(); 3276 CHECK(!klass->IsInitialized()); 3277 lock.WaitIgnoringInterrupts(); 3278 3279 // When we wake up, repeat the test for init-in-progress. If 3280 // there's an exception pending (only possible if 3281 // "interruptShouldThrow" was set), bail out. 3282 if (self->IsExceptionPending()) { 3283 WrapExceptionInInitializer(); 3284 klass->SetStatus(mirror::Class::kStatusError, self); 3285 return false; 3286 } 3287 // Spurious wakeup? Go back to waiting. 3288 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3289 continue; 3290 } 3291 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3292 // Compile time initialization failed. 3293 return false; 3294 } 3295 if (klass->IsErroneous()) { 3296 // The caller wants an exception, but it was thrown in a 3297 // different thread. Synthesize one here. 3298 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3299 PrettyDescriptor(klass.Get()).c_str()); 3300 return false; 3301 } 3302 if (klass->IsInitialized()) { 3303 return true; 3304 } 3305 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 3306 << klass->GetStatus(); 3307 } 3308 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 3309} 3310 3311bool ClassLinker::ValidateSuperClassDescriptors(const Handle<mirror::Class>& klass) { 3312 if (klass->IsInterface()) { 3313 return true; 3314 } 3315 // Begin with the methods local to the superclass. 3316 MethodHelper mh; 3317 MethodHelper super_mh; 3318 if (klass->HasSuperClass() && 3319 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3320 for (int i = klass->GetSuperClass()->GetVTable()->GetLength() - 1; i >= 0; --i) { 3321 mh.ChangeMethod(klass->GetVTable()->GetWithoutChecks(i)); 3322 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTable()->GetWithoutChecks(i)); 3323 bool is_override = mh.GetMethod() != super_mh.GetMethod(); 3324 if (is_override && !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3325 ThrowLinkageError(klass.Get(), "Class %s method %s resolves differently in superclass %s", 3326 PrettyDescriptor(klass.Get()).c_str(), 3327 PrettyMethod(mh.GetMethod()).c_str(), 3328 PrettyDescriptor(klass->GetSuperClass()).c_str()); 3329 return false; 3330 } 3331 } 3332 } 3333 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3334 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 3335 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 3336 for (uint32_t j = 0; j < num_methods; ++j) { 3337 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 3338 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 3339 bool is_override = mh.GetMethod() != super_mh.GetMethod(); 3340 if (is_override && !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3341 ThrowLinkageError(klass.Get(), "Class %s method %s resolves differently in interface %s", 3342 PrettyDescriptor(klass.Get()).c_str(), 3343 PrettyMethod(mh.GetMethod()).c_str(), 3344 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 3345 return false; 3346 } 3347 } 3348 } 3349 } 3350 return true; 3351} 3352 3353bool ClassLinker::EnsureInitialized(const Handle<mirror::Class>& c, bool can_init_fields, 3354 bool can_init_parents) { 3355 DCHECK(c.Get() != NULL); 3356 if (c->IsInitialized()) { 3357 return true; 3358 } 3359 3360 bool success = InitializeClass(c, can_init_fields, can_init_parents); 3361 if (!success) { 3362 if (can_init_fields && can_init_parents) { 3363 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.Get()); 3364 } 3365 } 3366 return success; 3367} 3368 3369void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3370 mirror::Class* c, 3371 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3372 const byte* class_data = dex_file.GetClassData(dex_class_def); 3373 ClassDataItemIterator it(dex_file, class_data); 3374 StackHandleScope<2> hs(Thread::Current()); 3375 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 3376 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 3377 CHECK(!kMovingFields); 3378 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3379 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3380 } 3381} 3382 3383bool ClassLinker::LinkClass(Thread* self, const Handle<mirror::Class>& klass, 3384 const Handle<mirror::ObjectArray<mirror::Class> >& interfaces) { 3385 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3386 if (!LinkSuperClass(klass)) { 3387 return false; 3388 } 3389 if (!LinkMethods(klass, interfaces)) { 3390 return false; 3391 } 3392 if (!LinkInstanceFields(klass)) { 3393 return false; 3394 } 3395 if (!LinkStaticFields(klass)) { 3396 return false; 3397 } 3398 CreateReferenceInstanceOffsets(klass); 3399 CreateReferenceStaticOffsets(klass); 3400 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3401 klass->SetStatus(mirror::Class::kStatusResolved, self); 3402 return true; 3403} 3404 3405bool ClassLinker::LoadSuperAndInterfaces(const Handle<mirror::Class>& klass, 3406 const DexFile& dex_file) { 3407 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3408 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3409 uint16_t super_class_idx = class_def.superclass_idx_; 3410 if (super_class_idx != DexFile::kDexNoIndex16) { 3411 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 3412 if (super_class == NULL) { 3413 DCHECK(Thread::Current()->IsExceptionPending()); 3414 return false; 3415 } 3416 // Verify 3417 if (!klass->CanAccess(super_class)) { 3418 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 3419 PrettyDescriptor(super_class).c_str(), 3420 PrettyDescriptor(klass.Get()).c_str()); 3421 return false; 3422 } 3423 klass->SetSuperClass(super_class); 3424 } 3425 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3426 if (interfaces != NULL) { 3427 for (size_t i = 0; i < interfaces->Size(); i++) { 3428 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3429 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 3430 if (interface == NULL) { 3431 DCHECK(Thread::Current()->IsExceptionPending()); 3432 return false; 3433 } 3434 // Verify 3435 if (!klass->CanAccess(interface)) { 3436 // TODO: the RI seemed to ignore this in my testing. 3437 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 3438 PrettyDescriptor(interface).c_str(), 3439 PrettyDescriptor(klass.Get()).c_str()); 3440 return false; 3441 } 3442 } 3443 } 3444 // Mark the class as loaded. 3445 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3446 return true; 3447} 3448 3449bool ClassLinker::LinkSuperClass(const Handle<mirror::Class>& klass) { 3450 CHECK(!klass->IsPrimitive()); 3451 mirror::Class* super = klass->GetSuperClass(); 3452 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 3453 if (super != NULL) { 3454 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 3455 return false; 3456 } 3457 return true; 3458 } 3459 if (super == NULL) { 3460 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 3461 PrettyDescriptor(klass.Get()).c_str()); 3462 return false; 3463 } 3464 // Verify 3465 if (super->IsFinal() || super->IsInterface()) { 3466 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 3467 PrettyDescriptor(super).c_str(), 3468 PrettyDescriptor(klass.Get()).c_str(), 3469 super->IsFinal() ? "declared final" : "an interface"); 3470 return false; 3471 } 3472 if (!klass->CanAccess(super)) { 3473 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 3474 PrettyDescriptor(super).c_str(), 3475 PrettyDescriptor(klass.Get()).c_str()); 3476 return false; 3477 } 3478 3479 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3480 if (super->IsFinalizable()) { 3481 klass->SetFinalizable(); 3482 } 3483 3484 // Inherit reference flags (if any) from the superclass. 3485 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3486 if (reference_flags != 0) { 3487 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3488 } 3489 // Disallow custom direct subclasses of java.lang.ref.Reference. 3490 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3491 ThrowLinkageError(klass.Get(), 3492 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3493 PrettyDescriptor(klass.Get()).c_str()); 3494 return false; 3495 } 3496 3497 if (kIsDebugBuild) { 3498 // Ensure super classes are fully resolved prior to resolving fields.. 3499 while (super != NULL) { 3500 CHECK(super->IsResolved()); 3501 super = super->GetSuperClass(); 3502 } 3503 } 3504 return true; 3505} 3506 3507// Populate the class vtable and itable. Compute return type indices. 3508bool ClassLinker::LinkMethods(const Handle<mirror::Class>& klass, 3509 const Handle<mirror::ObjectArray<mirror::Class> >& interfaces) { 3510 if (klass->IsInterface()) { 3511 // No vtable. 3512 size_t count = klass->NumVirtualMethods(); 3513 if (!IsUint(16, count)) { 3514 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 3515 return false; 3516 } 3517 for (size_t i = 0; i < count; ++i) { 3518 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3519 } 3520 // Link interface method tables 3521 return LinkInterfaceMethods(klass, interfaces); 3522 } else { 3523 // Link virtual and interface method tables 3524 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3525 } 3526 return true; 3527} 3528 3529bool ClassLinker::LinkVirtualMethods(const Handle<mirror::Class>& klass) { 3530 Thread* self = Thread::Current(); 3531 if (klass->HasSuperClass()) { 3532 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3533 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3534 CHECK_LE(actual_count, max_count); 3535 // TODO: do not assign to the vtable field until it is fully constructed. 3536 StackHandleScope<1> hs(self); 3537 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3538 hs.NewHandle(klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count))); 3539 if (UNLIKELY(vtable.Get() == NULL)) { 3540 CHECK(self->IsExceptionPending()); // OOME. 3541 return false; 3542 } 3543 // See if any of our virtual methods override the superclass. 3544 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3545 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3546 MethodHelper local_mh(local_method); 3547 size_t j = 0; 3548 for (; j < actual_count; ++j) { 3549 mirror::ArtMethod* super_method = vtable->Get(j); 3550 MethodHelper super_mh(super_method); 3551 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3552 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3553 if (super_method->IsFinal()) { 3554 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 3555 PrettyMethod(local_method).c_str(), 3556 super_mh.GetDeclaringClassDescriptor()); 3557 return false; 3558 } 3559 vtable->Set<false>(j, local_method); 3560 local_method->SetMethodIndex(j); 3561 break; 3562 } else { 3563 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3564 << " would have incorrectly overridden the package-private method in " 3565 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3566 } 3567 } 3568 } 3569 if (j == actual_count) { 3570 // Not overriding, append. 3571 vtable->Set<false>(actual_count, local_method); 3572 local_method->SetMethodIndex(actual_count); 3573 actual_count += 1; 3574 } 3575 } 3576 if (!IsUint(16, actual_count)) { 3577 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 3578 return false; 3579 } 3580 // Shrink vtable if possible 3581 CHECK_LE(actual_count, max_count); 3582 if (actual_count < max_count) { 3583 vtable.Assign(vtable->CopyOf(self, actual_count)); 3584 if (UNLIKELY(vtable.Get() == NULL)) { 3585 CHECK(self->IsExceptionPending()); // OOME. 3586 return false; 3587 } 3588 } 3589 klass->SetVTable(vtable.Get()); 3590 } else { 3591 CHECK(klass.Get() == GetClassRoot(kJavaLangObject)); 3592 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3593 if (!IsUint(16, num_virtual_methods)) { 3594 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 3595 return false; 3596 } 3597 StackHandleScope<1> hs(self); 3598 Handle<mirror::ObjectArray<mirror::ArtMethod> > 3599 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 3600 if (UNLIKELY(vtable.Get() == NULL)) { 3601 CHECK(self->IsExceptionPending()); // OOME. 3602 return false; 3603 } 3604 for (size_t i = 0; i < num_virtual_methods; ++i) { 3605 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3606 vtable->Set<false>(i, virtual_method); 3607 virtual_method->SetMethodIndex(i & 0xFFFF); 3608 } 3609 klass->SetVTable(vtable.Get()); 3610 } 3611 return true; 3612} 3613 3614bool ClassLinker::LinkInterfaceMethods(const Handle<mirror::Class>& klass, 3615 const Handle<mirror::ObjectArray<mirror::Class> >& interfaces) { 3616 // Set the imt table to be all conflicts by default. 3617 klass->SetImTable(Runtime::Current()->GetDefaultImt()); 3618 size_t super_ifcount; 3619 if (klass->HasSuperClass()) { 3620 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3621 } else { 3622 super_ifcount = 0; 3623 } 3624 size_t ifcount = super_ifcount; 3625 uint32_t num_interfaces; 3626 { 3627 ClassHelper kh(klass.Get()); 3628 num_interfaces = 3629 interfaces.Get() == nullptr ? kh.NumDirectInterfaces() : interfaces->GetLength(); 3630 ifcount += num_interfaces; 3631 for (size_t i = 0; i < num_interfaces; i++) { 3632 mirror::Class* interface = 3633 interfaces.Get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3634 ifcount += interface->GetIfTableCount(); 3635 } 3636 } 3637 if (ifcount == 0) { 3638 // Class implements no interfaces. 3639 DCHECK_EQ(klass->GetIfTableCount(), 0); 3640 DCHECK(klass->GetIfTable() == NULL); 3641 return true; 3642 } 3643 if (ifcount == super_ifcount) { 3644 // Class implements same interfaces as parent, are any of these not marker interfaces? 3645 bool has_non_marker_interface = false; 3646 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3647 for (size_t i = 0; i < ifcount; ++i) { 3648 if (super_iftable->GetMethodArrayCount(i) > 0) { 3649 has_non_marker_interface = true; 3650 break; 3651 } 3652 } 3653 if (!has_non_marker_interface) { 3654 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3655 klass->SetIfTable(super_iftable); 3656 return true; 3657 } 3658 } 3659 Thread* self = Thread::Current(); 3660 StackHandleScope<2> hs(self); 3661 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 3662 if (UNLIKELY(iftable.Get() == NULL)) { 3663 CHECK(self->IsExceptionPending()); // OOME. 3664 return false; 3665 } 3666 if (super_ifcount != 0) { 3667 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3668 for (size_t i = 0; i < super_ifcount; i++) { 3669 mirror::Class* super_interface = super_iftable->GetInterface(i); 3670 iftable->SetInterface(i, super_interface); 3671 } 3672 } 3673 // Flatten the interface inheritance hierarchy. 3674 size_t idx = super_ifcount; 3675 for (size_t i = 0; i < num_interfaces; i++) { 3676 ClassHelper kh(klass.Get()); 3677 mirror::Class* interface = 3678 interfaces.Get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3679 DCHECK(interface != NULL); 3680 if (!interface->IsInterface()) { 3681 ClassHelper ih(interface); 3682 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 3683 PrettyDescriptor(klass.Get()).c_str(), 3684 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3685 return false; 3686 } 3687 // Check if interface is already in iftable 3688 bool duplicate = false; 3689 for (size_t j = 0; j < idx; j++) { 3690 mirror::Class* existing_interface = iftable->GetInterface(j); 3691 if (existing_interface == interface) { 3692 duplicate = true; 3693 break; 3694 } 3695 } 3696 if (!duplicate) { 3697 // Add this non-duplicate interface. 3698 iftable->SetInterface(idx++, interface); 3699 // Add this interface's non-duplicate super-interfaces. 3700 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3701 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3702 bool super_duplicate = false; 3703 for (size_t k = 0; k < idx; k++) { 3704 mirror::Class* existing_interface = iftable->GetInterface(k); 3705 if (existing_interface == super_interface) { 3706 super_duplicate = true; 3707 break; 3708 } 3709 } 3710 if (!super_duplicate) { 3711 iftable->SetInterface(idx++, super_interface); 3712 } 3713 } 3714 } 3715 } 3716 // Shrink iftable in case duplicates were found 3717 if (idx < ifcount) { 3718 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3719 if (UNLIKELY(iftable.Get() == NULL)) { 3720 CHECK(self->IsExceptionPending()); // OOME. 3721 return false; 3722 } 3723 ifcount = idx; 3724 } else { 3725 CHECK_EQ(idx, ifcount); 3726 } 3727 klass->SetIfTable(iftable.Get()); 3728 3729 // If we're an interface, we don't need the vtable pointers, so we're done. 3730 if (klass->IsInterface()) { 3731 return true; 3732 } 3733 // Allocate imtable 3734 bool imtable_changed = false; 3735 Handle<mirror::ObjectArray<mirror::ArtMethod> > imtable( 3736 hs.NewHandle(AllocArtMethodArray(self, kImtSize))); 3737 if (UNLIKELY(imtable.Get() == NULL)) { 3738 CHECK(self->IsExceptionPending()); // OOME. 3739 return false; 3740 } 3741 std::vector<mirror::ArtMethod*> miranda_list; 3742 for (size_t i = 0; i < ifcount; ++i) { 3743 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 3744 if (num_methods > 0) { 3745 StackHandleScope<2> hs(self); 3746 Handle<mirror::ObjectArray<mirror::ArtMethod> > 3747 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 3748 if (UNLIKELY(method_array.Get() == nullptr)) { 3749 CHECK(self->IsExceptionPending()); // OOME. 3750 return false; 3751 } 3752 iftable->SetMethodArray(i, method_array.Get()); 3753 Handle<mirror::ObjectArray<mirror::ArtMethod> > vtable( 3754 hs.NewHandle(klass->GetVTableDuringLinking())); 3755 for (size_t j = 0; j < num_methods; ++j) { 3756 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 3757 MethodHelper interface_mh(interface_method); 3758 int32_t k; 3759 // For each method listed in the interface's method list, find the 3760 // matching method in our class's method list. We want to favor the 3761 // subclass over the superclass, which just requires walking 3762 // back from the end of the vtable. (This only matters if the 3763 // superclass defines a private method and this class redefines 3764 // it -- otherwise it would use the same vtable slot. In .dex files 3765 // those don't end up in the virtual method table, so it shouldn't 3766 // matter which direction we go. We walk it backward anyway.) 3767 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3768 mirror::ArtMethod* vtable_method = vtable->Get(k); 3769 MethodHelper vtable_mh(vtable_method); 3770 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3771 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3772 ThrowIllegalAccessError(klass.Get(), 3773 "Method '%s' implementing interface method '%s' is not public", 3774 PrettyMethod(vtable_method).c_str(), 3775 PrettyMethod(interface_method).c_str()); 3776 return false; 3777 } 3778 method_array->Set<false>(j, vtable_method); 3779 // Place method in imt if entry is empty, place conflict otherwise. 3780 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3781 if (imtable->Get(imt_index) == NULL) { 3782 imtable->Set<false>(imt_index, vtable_method); 3783 imtable_changed = true; 3784 } else { 3785 imtable->Set<false>(imt_index, Runtime::Current()->GetImtConflictMethod()); 3786 } 3787 break; 3788 } 3789 } 3790 if (k < 0) { 3791 StackHandleScope<1> hs(self); 3792 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 3793 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3794 mirror::ArtMethod* mir_method = miranda_list[mir]; 3795 MethodHelper vtable_mh(mir_method); 3796 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3797 miranda_method.Assign(miranda_list[mir]); 3798 break; 3799 } 3800 } 3801 if (miranda_method.Get() == NULL) { 3802 // Point the interface table at a phantom slot. 3803 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3804 if (UNLIKELY(miranda_method.Get() == NULL)) { 3805 CHECK(self->IsExceptionPending()); // OOME. 3806 return false; 3807 } 3808 // TODO: If a methods move then the miranda_list may hold stale references. 3809 miranda_list.push_back(miranda_method.Get()); 3810 } 3811 method_array->Set<false>(j, miranda_method.Get()); 3812 } 3813 } 3814 } 3815 } 3816 if (imtable_changed) { 3817 // Fill in empty entries in interface method table with conflict. 3818 mirror::ArtMethod* imt_conflict_method = Runtime::Current()->GetImtConflictMethod(); 3819 for (size_t i = 0; i < kImtSize; i++) { 3820 if (imtable->Get(i) == NULL) { 3821 imtable->Set<false>(i, imt_conflict_method); 3822 } 3823 } 3824 klass->SetImTable(imtable.Get()); 3825 } 3826 if (!miranda_list.empty()) { 3827 int old_method_count = klass->NumVirtualMethods(); 3828 int new_method_count = old_method_count + miranda_list.size(); 3829 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3830 if (old_method_count == 0) { 3831 virtuals = AllocArtMethodArray(self, new_method_count); 3832 } else { 3833 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3834 } 3835 if (UNLIKELY(virtuals == NULL)) { 3836 CHECK(self->IsExceptionPending()); // OOME. 3837 return false; 3838 } 3839 klass->SetVirtualMethods(virtuals); 3840 3841 StackHandleScope<1> hs(self); 3842 Handle<mirror::ObjectArray<mirror::ArtMethod> > vtable( 3843 hs.NewHandle(klass->GetVTableDuringLinking())); 3844 CHECK(vtable.Get() != NULL); 3845 int old_vtable_count = vtable->GetLength(); 3846 int new_vtable_count = old_vtable_count + miranda_list.size(); 3847 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 3848 if (UNLIKELY(vtable.Get() == NULL)) { 3849 CHECK(self->IsExceptionPending()); // OOME. 3850 return false; 3851 } 3852 for (size_t i = 0; i < miranda_list.size(); ++i) { 3853 mirror::ArtMethod* method = miranda_list[i]; 3854 // Leave the declaring class alone as type indices are relative to it 3855 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3856 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3857 klass->SetVirtualMethod(old_method_count + i, method); 3858 vtable->Set<false>(old_vtable_count + i, method); 3859 } 3860 // TODO: do not assign to the vtable field until it is fully constructed. 3861 klass->SetVTable(vtable.Get()); 3862 } 3863 3864 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3865 for (int i = 0; i < vtable->GetLength(); ++i) { 3866 CHECK(vtable->Get(i) != NULL); 3867 } 3868 3869// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3870 3871 return true; 3872} 3873 3874bool ClassLinker::LinkInstanceFields(const Handle<mirror::Class>& klass) { 3875 CHECK(klass.Get() != NULL); 3876 return LinkFields(klass, false); 3877} 3878 3879bool ClassLinker::LinkStaticFields(const Handle<mirror::Class>& klass) { 3880 CHECK(klass.Get() != NULL); 3881 size_t allocated_class_size = klass->GetClassSize(); 3882 bool success = LinkFields(klass, true); 3883 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3884 return success; 3885} 3886 3887struct LinkFieldsComparator { 3888 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3889 } 3890 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3891 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 3892 NO_THREAD_SAFETY_ANALYSIS { 3893 // First come reference fields, then 64-bit, and finally 32-bit 3894 FieldHelper fh1(field1); 3895 Primitive::Type type1 = fh1.GetTypeAsPrimitiveType(); 3896 FieldHelper fh2(field2); 3897 Primitive::Type type2 = fh2.GetTypeAsPrimitiveType(); 3898 if (type1 != type2) { 3899 bool is_primitive1 = type1 != Primitive::kPrimNot; 3900 bool is_primitive2 = type2 != Primitive::kPrimNot; 3901 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3902 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3903 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 3904 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 3905 if (order1 != order2) { 3906 return order1 < order2; 3907 } 3908 } 3909 // same basic group? then sort by string. 3910 const char* name1 = fh1.GetName(); 3911 const char* name2 = fh2.GetName(); 3912 return strcmp(name1, name2) < 0; 3913 } 3914}; 3915 3916bool ClassLinker::LinkFields(const Handle<mirror::Class>& klass, bool is_static) { 3917 size_t num_fields = 3918 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3919 3920 mirror::ObjectArray<mirror::ArtField>* fields = 3921 is_static ? klass->GetSFields() : klass->GetIFields(); 3922 3923 // Initialize size and field_offset 3924 size_t size; 3925 MemberOffset field_offset(0); 3926 if (is_static) { 3927 size = klass->GetClassSize(); 3928 field_offset = mirror::Class::FieldsOffset(); 3929 } else { 3930 mirror::Class* super_class = klass->GetSuperClass(); 3931 if (super_class != NULL) { 3932 CHECK(super_class->IsResolved()); 3933 field_offset = MemberOffset(super_class->GetObjectSize()); 3934 } 3935 size = field_offset.Uint32Value(); 3936 } 3937 3938 CHECK_EQ(num_fields == 0, fields == NULL); 3939 3940 // we want a relatively stable order so that adding new fields 3941 // minimizes disruption of C++ version such as Class and Method. 3942 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3943 for (size_t i = 0; i < num_fields; i++) { 3944 mirror::ArtField* f = fields->Get(i); 3945 CHECK(f != NULL); 3946 grouped_and_sorted_fields.push_back(f); 3947 } 3948 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 3949 LinkFieldsComparator()); 3950 3951 // References should be at the front. 3952 size_t current_field = 0; 3953 size_t num_reference_fields = 0; 3954 for (; current_field < num_fields; current_field++) { 3955 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3956 FieldHelper fh(field); 3957 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3958 bool isPrimitive = type != Primitive::kPrimNot; 3959 if (isPrimitive) { 3960 break; // past last reference, move on to the next phase 3961 } 3962 grouped_and_sorted_fields.pop_front(); 3963 num_reference_fields++; 3964 fields->Set<false>(current_field, field); 3965 field->SetOffset(field_offset); 3966 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3967 } 3968 3969 // Now we want to pack all of the double-wide fields together. If 3970 // we're not aligned, though, we want to shuffle one 32-bit field 3971 // into place. If we can't find one, we'll have to pad it. 3972 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3973 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3974 mirror::ArtField* field = grouped_and_sorted_fields[i]; 3975 FieldHelper fh(field); 3976 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3977 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3978 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 3979 continue; 3980 } 3981 fields->Set<false>(current_field++, field); 3982 field->SetOffset(field_offset); 3983 // drop the consumed field 3984 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 3985 break; 3986 } 3987 // whether we found a 32-bit field for padding or not, we advance 3988 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3989 } 3990 3991 // Alignment is good, shuffle any double-wide fields forward, and 3992 // finish assigning field offsets to all fields. 3993 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 3994 while (!grouped_and_sorted_fields.empty()) { 3995 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3996 grouped_and_sorted_fields.pop_front(); 3997 FieldHelper fh(field); 3998 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3999 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 4000 fields->Set<false>(current_field, field); 4001 field->SetOffset(field_offset); 4002 field_offset = MemberOffset(field_offset.Uint32Value() + 4003 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4004 ? sizeof(uint64_t) 4005 : sizeof(uint32_t))); 4006 current_field++; 4007 } 4008 4009 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4010 if (!is_static && 4011 (strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.Get()).GetDescriptor()) == 0)) { 4012 // We know there are no non-reference fields in the Reference classes, and we know 4013 // that 'referent' is alphabetically last, so this is easy... 4014 CHECK_EQ(num_reference_fields, num_fields); 4015 FieldHelper fh(fields->Get(num_fields - 1)); 4016 CHECK_STREQ(fh.GetName(), "referent"); 4017 --num_reference_fields; 4018 } 4019 4020 if (kIsDebugBuild) { 4021 // Make sure that all reference fields appear before 4022 // non-reference fields, and all double-wide fields are aligned. 4023 bool seen_non_ref = false; 4024 for (size_t i = 0; i < num_fields; i++) { 4025 mirror::ArtField* field = fields->Get(i); 4026 if (false) { // enable to debug field layout 4027 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4028 << " class=" << PrettyClass(klass.Get()) 4029 << " field=" << PrettyField(field) 4030 << " offset=" 4031 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4032 } 4033 FieldHelper fh(field); 4034 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4035 bool is_primitive = type != Primitive::kPrimNot; 4036 if ((strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.Get()).GetDescriptor()) == 0) 4037 && (strcmp("referent", fh.GetName()) == 0)) { 4038 is_primitive = true; // We lied above, so we have to expect a lie here. 4039 } 4040 if (is_primitive) { 4041 if (!seen_non_ref) { 4042 seen_non_ref = true; 4043 DCHECK_EQ(num_reference_fields, i); 4044 } 4045 } else { 4046 DCHECK(!seen_non_ref); 4047 } 4048 } 4049 if (!seen_non_ref) { 4050 DCHECK_EQ(num_fields, num_reference_fields); 4051 } 4052 } 4053 size = field_offset.Uint32Value(); 4054 // Update klass 4055 if (is_static) { 4056 klass->SetNumReferenceStaticFields(num_reference_fields); 4057 klass->SetClassSize(size); 4058 } else { 4059 klass->SetNumReferenceInstanceFields(num_reference_fields); 4060 if (!klass->IsVariableSize()) { 4061 DCHECK_GE(size, sizeof(mirror::Object)) << ClassHelper(klass.Get()).GetDescriptor(); 4062 size_t previous_size = klass->GetObjectSize(); 4063 if (previous_size != 0) { 4064 // Make sure that we didn't originally have an incorrect size. 4065 CHECK_EQ(previous_size, size); 4066 } 4067 klass->SetObjectSize(size); 4068 } 4069 } 4070 return true; 4071} 4072 4073// Set the bitmap of reference offsets, refOffsets, from the ifields 4074// list. 4075void ClassLinker::CreateReferenceInstanceOffsets(const Handle<mirror::Class>& klass) { 4076 uint32_t reference_offsets = 0; 4077 mirror::Class* super_class = klass->GetSuperClass(); 4078 if (super_class != NULL) { 4079 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4080 // If our superclass overflowed, we don't stand a chance. 4081 if (reference_offsets == CLASS_WALK_SUPER) { 4082 klass->SetReferenceInstanceOffsets(reference_offsets); 4083 return; 4084 } 4085 } 4086 CreateReferenceOffsets(klass, false, reference_offsets); 4087} 4088 4089void ClassLinker::CreateReferenceStaticOffsets(const Handle<mirror::Class>& klass) { 4090 CreateReferenceOffsets(klass, true, 0); 4091} 4092 4093void ClassLinker::CreateReferenceOffsets(const Handle<mirror::Class>& klass, bool is_static, 4094 uint32_t reference_offsets) { 4095 size_t num_reference_fields = 4096 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4097 : klass->NumReferenceInstanceFieldsDuringLinking(); 4098 mirror::ObjectArray<mirror::ArtField>* fields = 4099 is_static ? klass->GetSFields() : klass->GetIFields(); 4100 // All of the fields that contain object references are guaranteed 4101 // to be at the beginning of the fields list. 4102 for (size_t i = 0; i < num_reference_fields; ++i) { 4103 // Note that byte_offset is the offset from the beginning of 4104 // object, not the offset into instance data 4105 mirror::ArtField* field = fields->Get(i); 4106 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4107 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4108 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4109 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4110 CHECK_NE(new_bit, 0U); 4111 reference_offsets |= new_bit; 4112 } else { 4113 reference_offsets = CLASS_WALK_SUPER; 4114 break; 4115 } 4116 } 4117 // Update fields in klass 4118 if (is_static) { 4119 klass->SetReferenceStaticOffsets(reference_offsets); 4120 } else { 4121 klass->SetReferenceInstanceOffsets(reference_offsets); 4122 } 4123} 4124 4125mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4126 const Handle<mirror::DexCache>& dex_cache) { 4127 DCHECK(dex_cache.Get() != nullptr); 4128 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4129 if (resolved != NULL) { 4130 return resolved; 4131 } 4132 uint32_t utf16_length; 4133 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4134 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4135 dex_cache->SetResolvedString(string_idx, string); 4136 return string; 4137} 4138 4139mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4140 mirror::Class* referrer) { 4141 StackHandleScope<2> hs(Thread::Current()); 4142 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4143 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4144 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4145} 4146 4147mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4148 const Handle<mirror::DexCache>& dex_cache, 4149 const Handle<mirror::ClassLoader>& class_loader) { 4150 DCHECK(dex_cache.Get() != NULL); 4151 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4152 if (resolved == NULL) { 4153 Thread* self = Thread::Current(); 4154 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4155 resolved = FindClass(self, descriptor, class_loader); 4156 if (resolved != NULL) { 4157 // TODO: we used to throw here if resolved's class loader was not the 4158 // boot class loader. This was to permit different classes with the 4159 // same name to be loaded simultaneously by different loaders 4160 dex_cache->SetResolvedType(type_idx, resolved); 4161 } else { 4162 CHECK(self->IsExceptionPending()) 4163 << "Expected pending exception for failed resolution of: " << descriptor; 4164 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4165 StackHandleScope<1> hs(self); 4166 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4167 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4168 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4169 self->ClearException(); 4170 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4171 self->GetException(NULL)->SetCause(cause.Get()); 4172 } 4173 } 4174 } 4175 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4176 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4177 return resolved; 4178} 4179 4180mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 4181 uint32_t method_idx, 4182 const Handle<mirror::DexCache>& dex_cache, 4183 const Handle<mirror::ClassLoader>& class_loader, 4184 mirror::ArtMethod* referrer, 4185 InvokeType type) { 4186 DCHECK(dex_cache.Get() != NULL); 4187 // Check for hit in the dex cache. 4188 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4189 if (resolved != NULL && !resolved->IsRuntimeMethod()) { 4190 return resolved; 4191 } 4192 // Fail, get the declaring class. 4193 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4194 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4195 if (klass == NULL) { 4196 DCHECK(Thread::Current()->IsExceptionPending()); 4197 return NULL; 4198 } 4199 // Scan using method_idx, this saves string compares but will only hit for matching dex 4200 // caches/files. 4201 switch (type) { 4202 case kDirect: // Fall-through. 4203 case kStatic: 4204 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 4205 break; 4206 case kInterface: 4207 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 4208 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4209 break; 4210 case kSuper: // Fall-through. 4211 case kVirtual: 4212 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 4213 break; 4214 default: 4215 LOG(FATAL) << "Unreachable - invocation type: " << type; 4216 } 4217 if (resolved == NULL) { 4218 // Search by name, which works across dex files. 4219 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4220 const Signature signature = dex_file.GetMethodSignature(method_id); 4221 switch (type) { 4222 case kDirect: // Fall-through. 4223 case kStatic: 4224 resolved = klass->FindDirectMethod(name, signature); 4225 break; 4226 case kInterface: 4227 resolved = klass->FindInterfaceMethod(name, signature); 4228 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4229 break; 4230 case kSuper: // Fall-through. 4231 case kVirtual: 4232 resolved = klass->FindVirtualMethod(name, signature); 4233 break; 4234 } 4235 } 4236 if (resolved != NULL) { 4237 // We found a method, check for incompatible class changes. 4238 if (resolved->CheckIncompatibleClassChange(type)) { 4239 resolved = NULL; 4240 } 4241 } 4242 if (resolved != NULL) { 4243 // Be a good citizen and update the dex cache to speed subsequent calls. 4244 dex_cache->SetResolvedMethod(method_idx, resolved); 4245 return resolved; 4246 } else { 4247 // We failed to find the method which means either an access error, an incompatible class 4248 // change, or no such method. First try to find the method among direct and virtual methods. 4249 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4250 const Signature signature = dex_file.GetMethodSignature(method_id); 4251 switch (type) { 4252 case kDirect: 4253 case kStatic: 4254 resolved = klass->FindVirtualMethod(name, signature); 4255 break; 4256 case kInterface: 4257 case kVirtual: 4258 case kSuper: 4259 resolved = klass->FindDirectMethod(name, signature); 4260 break; 4261 } 4262 4263 // If we found something, check that it can be accessed by the referrer. 4264 if (resolved != NULL && referrer != NULL) { 4265 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4266 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4267 if (!referring_class->CanAccess(methods_class)) { 4268 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4269 resolved, type); 4270 return NULL; 4271 } else if (!referring_class->CanAccessMember(methods_class, 4272 resolved->GetAccessFlags())) { 4273 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4274 return NULL; 4275 } 4276 } 4277 4278 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4279 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4280 switch (type) { 4281 case kDirect: 4282 case kStatic: 4283 if (resolved != NULL) { 4284 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4285 } else { 4286 resolved = klass->FindInterfaceMethod(name, signature); 4287 if (resolved != NULL) { 4288 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4289 } else { 4290 ThrowNoSuchMethodError(type, klass, name, signature); 4291 } 4292 } 4293 break; 4294 case kInterface: 4295 if (resolved != NULL) { 4296 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4297 } else { 4298 resolved = klass->FindVirtualMethod(name, signature); 4299 if (resolved != NULL) { 4300 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4301 } else { 4302 ThrowNoSuchMethodError(type, klass, name, signature); 4303 } 4304 } 4305 break; 4306 case kSuper: 4307 ThrowNoSuchMethodError(type, klass, name, signature); 4308 break; 4309 case kVirtual: 4310 if (resolved != NULL) { 4311 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4312 } else { 4313 resolved = klass->FindInterfaceMethod(name, signature); 4314 if (resolved != NULL) { 4315 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4316 } else { 4317 ThrowNoSuchMethodError(type, klass, name, signature); 4318 } 4319 } 4320 break; 4321 } 4322 DCHECK(Thread::Current()->IsExceptionPending()); 4323 return NULL; 4324 } 4325} 4326 4327mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4328 const Handle<mirror::DexCache>& dex_cache, 4329 const Handle<mirror::ClassLoader>& class_loader, 4330 bool is_static) { 4331 DCHECK(dex_cache.Get() != nullptr); 4332 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4333 if (resolved != NULL) { 4334 return resolved; 4335 } 4336 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4337 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4338 if (klass == NULL) { 4339 DCHECK(Thread::Current()->IsExceptionPending()); 4340 return NULL; 4341 } 4342 4343 if (is_static) { 4344 resolved = klass->FindStaticField(dex_cache.Get(), field_idx); 4345 } else { 4346 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 4347 } 4348 4349 if (resolved == NULL) { 4350 const char* name = dex_file.GetFieldName(field_id); 4351 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4352 if (is_static) { 4353 resolved = klass->FindStaticField(name, type); 4354 } else { 4355 resolved = klass->FindInstanceField(name, type); 4356 } 4357 if (resolved == NULL) { 4358 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 4359 return NULL; 4360 } 4361 } 4362 dex_cache->SetResolvedField(field_idx, resolved); 4363 return resolved; 4364} 4365 4366mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4367 uint32_t field_idx, 4368 const Handle<mirror::DexCache>& dex_cache, 4369 const Handle<mirror::ClassLoader>& class_loader) { 4370 DCHECK(dex_cache.Get() != nullptr); 4371 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4372 if (resolved != NULL) { 4373 return resolved; 4374 } 4375 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4376 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4377 if (klass == NULL) { 4378 DCHECK(Thread::Current()->IsExceptionPending()); 4379 return NULL; 4380 } 4381 4382 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4383 StringPiece type(dex_file.StringDataByIdx( 4384 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4385 resolved = klass->FindField(name, type); 4386 if (resolved != NULL) { 4387 dex_cache->SetResolvedField(field_idx, resolved); 4388 } else { 4389 ThrowNoSuchFieldError("", klass, type, name); 4390 } 4391 return resolved; 4392} 4393 4394const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4395 uint32_t* length) { 4396 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4397 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4398 const DexFile& dex_file = *dex_cache->GetDexFile(); 4399 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4400 return dex_file.GetMethodShorty(method_id, length); 4401} 4402 4403void ClassLinker::DumpAllClasses(int flags) { 4404 if (dex_cache_image_class_lookup_required_) { 4405 MoveImageClassesToClassTable(); 4406 } 4407 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4408 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4409 std::vector<mirror::Class*> all_classes; 4410 { 4411 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4412 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 4413 all_classes.push_back(it.second); 4414 } 4415 } 4416 4417 for (size_t i = 0; i < all_classes.size(); ++i) { 4418 all_classes[i]->DumpClass(std::cerr, flags); 4419 } 4420} 4421 4422void ClassLinker::DumpForSigQuit(std::ostream& os) { 4423 if (dex_cache_image_class_lookup_required_) { 4424 MoveImageClassesToClassTable(); 4425 } 4426 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4427 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4428} 4429 4430size_t ClassLinker::NumLoadedClasses() { 4431 if (dex_cache_image_class_lookup_required_) { 4432 MoveImageClassesToClassTable(); 4433 } 4434 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4435 return class_table_.size(); 4436} 4437 4438pid_t ClassLinker::GetClassesLockOwner() { 4439 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4440} 4441 4442pid_t ClassLinker::GetDexLockOwner() { 4443 return dex_lock_.GetExclusiveOwnerTid(); 4444} 4445 4446void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4447 DCHECK(!init_done_); 4448 4449 DCHECK(klass != NULL); 4450 DCHECK(klass->GetClassLoader() == NULL); 4451 4452 DCHECK(class_roots_ != NULL); 4453 DCHECK(class_roots_->Get(class_root) == NULL); 4454 class_roots_->Set<false>(class_root, klass); 4455} 4456 4457} // namespace art 4458