class_linker.cc revision 2ec6520d57479d393bffa05defa1479b25ca8382
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 "intern_table.h" 41#include "interpreter/interpreter.h" 42#include "leb128.h" 43#include "oat.h" 44#include "oat_file.h" 45#include "mirror/art_field-inl.h" 46#include "mirror/art_method-inl.h" 47#include "mirror/class.h" 48#include "mirror/class-inl.h" 49#include "mirror/class_loader.h" 50#include "mirror/dex_cache-inl.h" 51#include "mirror/iftable-inl.h" 52#include "mirror/object-inl.h" 53#include "mirror/object_array-inl.h" 54#include "mirror/proxy.h" 55#include "mirror/stack_trace_element.h" 56#include "object_utils.h" 57#include "os.h" 58#include "runtime.h" 59#include "entrypoints/entrypoint_utils.h" 60#include "ScopedLocalRef.h" 61#include "scoped_thread_state_change.h" 62#include "sirt_ref.h" 63#include "stack_indirect_reference_table.h" 64#include "thread.h" 65#include "UniquePtr.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 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 190 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 191} 192 193void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 194 VLOG(startup) << "ClassLinker::Init"; 195 CHECK(Runtime::Current()->IsCompiler()); 196 197 CHECK(!init_done_); 198 199 // java_lang_Class comes first, it's needed for AllocClass 200 Thread* self = Thread::Current(); 201 gc::Heap* heap = Runtime::Current()->GetHeap(); 202 // The GC can't handle an object with a null class since we can't get the size of this object. 203 heap->IncrementDisableMovingGC(self); 204 SirtRef<mirror::Class> java_lang_Class(self, down_cast<mirror::Class*>( 205 heap->AllocNonMovableObject<true>(self, nullptr, sizeof(mirror::ClassClass)))); 206 CHECK(java_lang_Class.get() != NULL); 207 mirror::Class::SetClassClass(java_lang_Class.get()); 208 java_lang_Class->SetClass(java_lang_Class.get()); 209 if (kUseBrooksPointer) { 210 java_lang_Class->AssertSelfBrooksPointer(); 211 } 212 java_lang_Class->SetClassSize(sizeof(mirror::ClassClass)); 213 heap->DecrementDisableMovingGC(self); 214 // AllocClass(mirror::Class*) can now be used 215 216 // Class[] is used for reflection support. 217 SirtRef<mirror::Class> class_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 218 class_array_class->SetComponentType(java_lang_Class.get()); 219 220 // java_lang_Object comes next so that object_array_class can be created. 221 SirtRef<mirror::Class> java_lang_Object(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 222 CHECK(java_lang_Object.get() != NULL); 223 // backfill Object as the super class of Class. 224 java_lang_Class->SetSuperClass(java_lang_Object.get()); 225 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 226 227 // Object[] next to hold class roots. 228 SirtRef<mirror::Class> object_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 229 object_array_class->SetComponentType(java_lang_Object.get()); 230 231 // Setup the char class to be used for char[]. 232 SirtRef<mirror::Class> char_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 233 234 // Setup the char[] class to be used for String. 235 SirtRef<mirror::Class> char_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 236 char_array_class->SetComponentType(char_class.get()); 237 mirror::CharArray::SetArrayClass(char_array_class.get()); 238 239 // Setup String. 240 SirtRef<mirror::Class> java_lang_String(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::StringClass))); 241 mirror::String::SetClass(java_lang_String.get()); 242 java_lang_String->SetObjectSize(sizeof(mirror::String)); 243 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 244 245 // Create storage for root classes, save away our work so far (requires descriptors). 246 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.get(), 247 kClassRootsMax); 248 CHECK(class_roots_ != NULL); 249 SetClassRoot(kJavaLangClass, java_lang_Class.get()); 250 SetClassRoot(kJavaLangObject, java_lang_Object.get()); 251 SetClassRoot(kClassArrayClass, class_array_class.get()); 252 SetClassRoot(kObjectArrayClass, object_array_class.get()); 253 SetClassRoot(kCharArrayClass, char_array_class.get()); 254 SetClassRoot(kJavaLangString, java_lang_String.get()); 255 256 // Setup the primitive type classes. 257 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 258 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 259 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 260 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 261 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 262 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 263 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 264 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 265 266 // Create array interface entries to populate once we can load system classes. 267 array_iftable_ = AllocIfTable(self, 2); 268 269 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 270 SirtRef<mirror::Class> int_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 271 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 272 mirror::IntArray::SetArrayClass(int_array_class.get()); 273 SetClassRoot(kIntArrayClass, int_array_class.get()); 274 275 // now that these are registered, we can use AllocClass() and AllocObjectArray 276 277 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 278 SirtRef<mirror::Class> 279 java_lang_DexCache(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::DexCacheClass))); 280 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.get()); 281 java_lang_DexCache->SetObjectSize(sizeof(mirror::DexCache)); 282 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 283 284 // Constructor, Field, Method, and AbstractMethod are necessary so that FindClass can link members. 285 SirtRef<mirror::Class> java_lang_reflect_ArtField(self, AllocClass(self, java_lang_Class.get(), 286 sizeof(mirror::ArtFieldClass))); 287 CHECK(java_lang_reflect_ArtField.get() != NULL); 288 java_lang_reflect_ArtField->SetObjectSize(sizeof(mirror::ArtField)); 289 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.get()); 290 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 291 mirror::ArtField::SetClass(java_lang_reflect_ArtField.get()); 292 293 SirtRef<mirror::Class> java_lang_reflect_ArtMethod(self, AllocClass(self, java_lang_Class.get(), 294 sizeof(mirror::ArtMethodClass))); 295 CHECK(java_lang_reflect_ArtMethod.get() != NULL); 296 java_lang_reflect_ArtMethod->SetObjectSize(sizeof(mirror::ArtMethod)); 297 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.get()); 298 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 299 300 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.get()); 301 302 // Set up array classes for string, field, method 303 SirtRef<mirror::Class> object_array_string(self, AllocClass(self, java_lang_Class.get(), 304 sizeof(mirror::Class))); 305 object_array_string->SetComponentType(java_lang_String.get()); 306 SetClassRoot(kJavaLangStringArrayClass, object_array_string.get()); 307 308 SirtRef<mirror::Class> object_array_art_method(self, AllocClass(self, java_lang_Class.get(), 309 sizeof(mirror::Class))); 310 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.get()); 311 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.get()); 312 313 SirtRef<mirror::Class> object_array_art_field(self, AllocClass(self, java_lang_Class.get(), 314 sizeof(mirror::Class))); 315 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.get()); 316 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.get()); 317 318 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 319 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 320 // these roots. 321 CHECK_NE(0U, boot_class_path.size()); 322 for (size_t i = 0; i != boot_class_path.size(); ++i) { 323 const DexFile* dex_file = boot_class_path[i]; 324 CHECK(dex_file != NULL); 325 AppendToBootClassPath(*dex_file); 326 } 327 328 // now we can use FindSystemClass 329 330 // run char class through InitializePrimitiveClass to finish init 331 InitializePrimitiveClass(char_class.get(), Primitive::kPrimChar); 332 SetClassRoot(kPrimitiveChar, char_class.get()); // needs descriptor 333 334 // Create runtime resolution and imt conflict methods. Also setup the default imt. 335 Runtime* runtime = Runtime::Current(); 336 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 337 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 338 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 339 340 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 341 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 342 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 343 CHECK_EQ(java_lang_Object.get(), Object_class); 344 CHECK_EQ(java_lang_Object->GetObjectSize(), sizeof(mirror::Object)); 345 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 346 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 347 CHECK_EQ(java_lang_String.get(), String_class); 348 CHECK_EQ(java_lang_String->GetObjectSize(), sizeof(mirror::String)); 349 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 350 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 351 CHECK_EQ(java_lang_String.get(), String_class); 352 CHECK_EQ(java_lang_DexCache.get(), DexCache_class); 353 CHECK_EQ(java_lang_DexCache->GetObjectSize(), sizeof(mirror::DexCache)); 354 355 // Setup the primitive array type classes - can't be done until Object has a vtable. 356 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 357 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 358 359 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 360 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 361 362 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 363 CHECK_EQ(char_array_class.get(), found_char_array_class); 364 365 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 366 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 367 368 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 369 CHECK_EQ(int_array_class.get(), found_int_array_class); 370 371 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 372 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 373 374 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 375 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 376 377 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 378 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 379 380 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 381 CHECK_EQ(class_array_class.get(), found_class_array_class); 382 383 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 384 CHECK_EQ(object_array_class.get(), found_object_array_class); 385 386 // Setup the single, global copy of "iftable". 387 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 388 CHECK(java_lang_Cloneable != NULL); 389 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 390 CHECK(java_io_Serializable != NULL); 391 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 392 // crawl up and explicitly list all of the supers as well. 393 array_iftable_->SetInterface(0, java_lang_Cloneable); 394 array_iftable_->SetInterface(1, java_io_Serializable); 395 396 // Sanity check Class[] and Object[]'s interfaces. 397 ClassHelper kh(class_array_class.get()); 398 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 399 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 400 kh.ChangeClass(object_array_class.get()); 401 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 402 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 403 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 404 // dex_cache_ fields and register them in class_table_. 405 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 406 CHECK_EQ(java_lang_Class.get(), Class_class); 407 408 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 409 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 410 CHECK_EQ(java_lang_reflect_ArtMethod.get(), Art_method_class); 411 412 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 413 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 414 CHECK_EQ(java_lang_reflect_ArtField.get(), Art_field_class); 415 416 mirror::Class* String_array_class = FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 417 CHECK_EQ(object_array_string.get(), String_array_class); 418 419 mirror::Class* Art_method_array_class = 420 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 421 CHECK_EQ(object_array_art_method.get(), Art_method_array_class); 422 423 mirror::Class* Art_field_array_class = 424 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 425 CHECK_EQ(object_array_art_field.get(), Art_field_array_class); 426 427 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 428 429 // Create java.lang.reflect.Proxy root. 430 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 431 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 432 433 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 434 mirror::Class* java_lang_ref_Reference = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 435 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference); 436 mirror::Class* java_lang_ref_FinalizerReference = FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 437 java_lang_ref_FinalizerReference->SetAccessFlags( 438 java_lang_ref_FinalizerReference->GetAccessFlags() | 439 kAccClassIsReference | kAccClassIsFinalizerReference); 440 mirror::Class* java_lang_ref_PhantomReference = FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 441 java_lang_ref_PhantomReference->SetAccessFlags( 442 java_lang_ref_PhantomReference->GetAccessFlags() | 443 kAccClassIsReference | kAccClassIsPhantomReference); 444 mirror::Class* java_lang_ref_SoftReference = FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 445 java_lang_ref_SoftReference->SetAccessFlags( 446 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 447 mirror::Class* java_lang_ref_WeakReference = FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 448 java_lang_ref_WeakReference->SetAccessFlags( 449 java_lang_ref_WeakReference->GetAccessFlags() | 450 kAccClassIsReference | kAccClassIsWeakReference); 451 452 // Setup the ClassLoader, verifying the object_size_. 453 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 454 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), sizeof(mirror::ClassLoader)); 455 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 456 457 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 458 // java.lang.StackTraceElement as a convenience. 459 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 460 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 461 SetClassRoot(kJavaLangClassNotFoundException, FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 462 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 463 SetClassRoot(kJavaLangStackTraceElementArrayClass, FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 464 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 465 466 FinishInit(self); 467 468 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 469} 470 471void ClassLinker::FinishInit(Thread* self) { 472 VLOG(startup) << "ClassLinker::FinishInit entering"; 473 474 // Let the heap know some key offsets into java.lang.ref instances 475 // Note: we hard code the field indexes here rather than using FindInstanceField 476 // as the types of the field can't be resolved prior to the runtime being 477 // fully initialized 478 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 479 mirror::Class* java_lang_ref_FinalizerReference = 480 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 481 482 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 483 FieldHelper fh(pendingNext); 484 CHECK_STREQ(fh.GetName(), "pendingNext"); 485 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 486 487 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 488 fh.ChangeField(queue); 489 CHECK_STREQ(fh.GetName(), "queue"); 490 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 491 492 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 493 fh.ChangeField(queueNext); 494 CHECK_STREQ(fh.GetName(), "queueNext"); 495 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 496 497 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 498 fh.ChangeField(referent); 499 CHECK_STREQ(fh.GetName(), "referent"); 500 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 501 502 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 503 fh.ChangeField(zombie); 504 CHECK_STREQ(fh.GetName(), "zombie"); 505 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 506 507 gc::Heap* heap = Runtime::Current()->GetHeap(); 508 heap->SetReferenceOffsets(referent->GetOffset(), 509 queue->GetOffset(), 510 queueNext->GetOffset(), 511 pendingNext->GetOffset(), 512 zombie->GetOffset()); 513 514 // ensure all class_roots_ are initialized 515 for (size_t i = 0; i < kClassRootsMax; i++) { 516 ClassRoot class_root = static_cast<ClassRoot>(i); 517 mirror::Class* klass = GetClassRoot(class_root); 518 CHECK(klass != NULL); 519 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 520 // note SetClassRoot does additional validation. 521 // if possible add new checks there to catch errors early 522 } 523 524 CHECK(array_iftable_ != NULL); 525 526 // disable the slow paths in FindClass and CreatePrimitiveClass now 527 // that Object, Class, and Object[] are setup 528 init_done_ = true; 529 530 VLOG(startup) << "ClassLinker::FinishInit exiting"; 531} 532 533void ClassLinker::RunRootClinits() { 534 Thread* self = Thread::Current(); 535 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 536 mirror::Class* c = GetClassRoot(ClassRoot(i)); 537 if (!c->IsArrayClass() && !c->IsPrimitive()) { 538 SirtRef<mirror::Class> sirt_class(self, GetClassRoot(ClassRoot(i))); 539 EnsureInitialized(sirt_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()->GetImageFilename(); 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 if (!kIsTargetBuild) { 577 argv.push_back("--host"); 578 } 579 argv.push_back(boot_image_option); 580 argv.push_back(dex_file_option); 581 argv.push_back(oat_fd_option); 582 argv.push_back(oat_location_option); 583 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 584 for (size_t i = 0; i < compiler_options.size(); ++i) { 585 argv.push_back(compiler_options[i].c_str()); 586 } 587 588 return Exec(argv, error_msg); 589} 590 591const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 592 WriterMutexLock mu(Thread::Current(), dex_lock_); 593 if (kIsDebugBuild) { 594 for (size_t i = 0; i < oat_files_.size(); ++i) { 595 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 596 } 597 } 598 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 599 oat_files_.push_back(oat_file); 600 return oat_file; 601} 602 603OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 604 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 605 OatFile* oat_file = space->ReleaseOatFile(); 606 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 607 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 608 return *oat_file; 609} 610 611const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 612 const char* dex_location = dex_file.GetLocation().c_str(); 613 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 614 return FindOpenedOatFileFromDexLocation(dex_location, &dex_location_checksum); 615} 616 617const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation(const char* dex_location, 618 const uint32_t* const dex_location_checksum) { 619 ReaderMutexLock mu(Thread::Current(), dex_lock_); 620 for (size_t i = 0; i < oat_files_.size(); i++) { 621 const OatFile* oat_file = oat_files_[i]; 622 DCHECK(oat_file != NULL); 623 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 624 dex_location_checksum, 625 false); 626 if (oat_dex_file != NULL) { 627 return oat_file; 628 } 629 } 630 return NULL; 631} 632 633const DexFile* ClassLinker::FindDexFileInOatLocation(const char* dex_location, 634 uint32_t dex_location_checksum, 635 const char* oat_location, 636 std::string* error_msg) { 637 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 638 !Runtime::Current()->IsCompiler(), 639 error_msg)); 640 if (oat_file.get() == nullptr) { 641 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 642 error_msg->c_str()); 643 return nullptr; 644 } 645 Runtime* runtime = Runtime::Current(); 646 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 647 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 648 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 649 if (expected_image_oat_checksum != actual_image_oat_checksum) { 650 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 651 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 652 actual_image_oat_checksum); 653 return nullptr; 654 } 655 656 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 657 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 658 if (expected_image_oat_offset != actual_image_oat_offset) { 659 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 660 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 661 actual_image_oat_offset); 662 return nullptr; 663 } 664 // TODO: this registers the oat file now as we may use the oat_dex_file later and we want the 665 // intern behavior of RegisterOatFile. However, if we take an early return we could remove 666 // the oat file. 667 const OatFile* opened_oat_file = RegisterOatFile(oat_file.release()); 668 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, 669 &dex_location_checksum); 670 if (oat_dex_file == nullptr) { 671 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 672 dex_location); 673 return nullptr; 674 } 675 uint32_t expected_dex_checksum = dex_location_checksum; 676 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 677 if (expected_dex_checksum != actual_dex_checksum) { 678 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 679 "found 0x%x", oat_location, expected_dex_checksum, 680 actual_dex_checksum); 681 return nullptr; 682 } 683 return oat_dex_file->OpenDexFile(error_msg); 684} 685 686class ScopedFlock { 687 public: 688 ScopedFlock() {} 689 690 bool Init(const char* filename, std::string* error_msg) { 691 while (true) { 692 file_.reset(OS::OpenFileWithFlags(filename, O_CREAT | O_RDWR)); 693 if (file_.get() == NULL) { 694 *error_msg = StringPrintf("Failed to open file '%s'", filename); 695 return false; 696 } 697 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_EX)); 698 if (flock_result != 0) { 699 *error_msg = StringPrintf("Failed to lock file '%s': %s", filename, strerror(errno)); 700 return false; 701 } 702 struct stat fstat_stat; 703 int fstat_result = TEMP_FAILURE_RETRY(fstat(file_->Fd(), &fstat_stat)); 704 if (fstat_result != 0) { 705 *error_msg = StringPrintf("Failed to fstat file '%s': %s", filename, strerror(errno)); 706 return false; 707 } 708 struct stat stat_stat; 709 int stat_result = TEMP_FAILURE_RETRY(stat(filename, &stat_stat)); 710 if (stat_result != 0) { 711 PLOG(WARNING) << "Failed to stat, will retry: " << filename; 712 // ENOENT can happen if someone racing with us unlinks the file we created so just retry. 713 continue; 714 } 715 if (fstat_stat.st_dev != stat_stat.st_dev || fstat_stat.st_ino != stat_stat.st_ino) { 716 LOG(WARNING) << "File changed while locking, will retry: " << filename; 717 continue; 718 } 719 return true; 720 } 721 } 722 723 File& GetFile() { 724 return *file_; 725 } 726 727 ~ScopedFlock() { 728 if (file_.get() != NULL) { 729 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_UN)); 730 CHECK_EQ(0, flock_result); 731 } 732 } 733 734 private: 735 UniquePtr<File> file_; 736 737 DISALLOW_COPY_AND_ASSIGN(ScopedFlock); 738}; 739 740const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation(const char* dex_location, 741 uint32_t dex_location_checksum, 742 const char* oat_location, 743 std::string* error_msg) { 744 // We play a locking game here so that if two different processes 745 // race to generate (or worse, one tries to open a partial generated 746 // file) we will be okay. This is actually common with apps that use 747 // DexClassLoader to work around the dex method reference limit and 748 // that have a background service running in a separate process. 749 ScopedFlock scoped_flock; 750 if (!scoped_flock.Init(oat_location, error_msg)) { 751 return nullptr; 752 } 753 754 // Check if we already have an up-to-date output file 755 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, dex_location_checksum, 756 oat_location, error_msg); 757 if (dex_file != nullptr) { 758 return dex_file; 759 } 760 VLOG(class_linker) << "Failed to find dex file '" << dex_location << "' in oat location '" 761 << oat_location << "': " << *error_msg; 762 error_msg->clear(); 763 764 // Generate the output oat file for the dex file 765 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 766 if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location, error_msg)) { 767 CHECK(!error_msg->empty()); 768 return nullptr; 769 } 770 const OatFile* oat_file = OatFile::Open(oat_location, oat_location, NULL, 771 !Runtime::Current()->IsCompiler(), 772 error_msg); 773 if (oat_file == nullptr) { 774 *error_msg = StringPrintf("Failed to open generated oat file '%s': %s", 775 oat_location, error_msg->c_str()); 776 return nullptr; 777 } 778 oat_file = RegisterOatFile(oat_file); 779 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 780 &dex_location_checksum); 781 if (oat_dex_file == nullptr) { 782 *error_msg = StringPrintf("Failed to find dex file '%s' (checksum 0x%x) in generated out file " 783 "'%s'", dex_location, dex_location_checksum, oat_location); 784 return nullptr; 785 } 786 const DexFile* result = oat_dex_file->OpenDexFile(error_msg); 787 CHECK(result != nullptr) << *error_msg; 788 CHECK_EQ(dex_location_checksum, result->GetLocationChecksum()) 789 << "dex_location=" << dex_location << " oat_location=" << oat_location << std::hex 790 << " dex_location_checksum=" << dex_location_checksum 791 << " DexFile::GetLocationChecksum()=" << result->GetLocationChecksum(); 792 return result; 793} 794 795bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 796 const char* dex_location, 797 uint32_t dex_location_checksum, 798 std::string* error_msg) { 799 Runtime* runtime = Runtime::Current(); 800 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 801 uint32_t image_oat_checksum = image_header.GetOatChecksum(); 802 uintptr_t image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 803 bool image_check = ((oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum) 804 && (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 805 806 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 807 if (oat_dex_file == NULL) { 808 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 809 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 810 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 811 for (size_t i = 0; i < oat_dex_files.size(); i++) { 812 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 813 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 814 oat_file->GetLocation().c_str(), 815 oat_dex_file->GetDexFileLocation().c_str()); 816 } 817 return false; 818 } 819 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 820 821 if (image_check && dex_check) { 822 return true; 823 } 824 825 if (!image_check) { 826 ScopedObjectAccess soa(Thread::Current()); 827 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with (0x%x, %" PRIdPTR ")", 828 oat_file->GetLocation().c_str(), 829 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 830 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 831 image_oat_checksum, image_oat_data_begin); 832 } 833 if (!dex_check) { 834 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 835 oat_file->GetLocation().c_str(), 836 oat_dex_file->GetDexFileLocationChecksum(), 837 dex_location, dex_location_checksum); 838 } 839 return false; 840} 841 842const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const std::string& oat_file_location, 843 const char* dex_location, 844 std::string* error_msg, 845 bool* open_failed) { 846 UniquePtr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 847 if (oat_file.get() == nullptr) { 848 *open_failed = true; 849 return nullptr; 850 } 851 *open_failed = false; 852 uint32_t dex_location_checksum; 853 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 854 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 855 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 856 // directory. 857 const OatFile* opened_oat_file = oat_file.release(); 858 opened_oat_file = RegisterOatFile(opened_oat_file); 859 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, NULL); 860 if (oat_dex_file == nullptr) { 861 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 862 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 863 error_msg->c_str()); 864 return nullptr; 865 } 866 return oat_dex_file->OpenDexFile(error_msg); 867 } 868 869 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 870 error_msg); 871 if (!verified) { 872 return nullptr; 873 } 874 const OatFile* opened_oat_file = oat_file.release(); 875 opened_oat_file = RegisterOatFile(opened_oat_file); 876 return opened_oat_file->GetOatDexFile(dex_location, 877 &dex_location_checksum)->OpenDexFile(error_msg); 878} 879 880const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const char* dex_location, 881 const uint32_t* const dex_location_checksum, 882 std::string* error_msg) { 883 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location, 884 dex_location_checksum); 885 if (open_oat_file != nullptr) { 886 const OatFile::OatDexFile* oat_dex_file = open_oat_file->GetOatDexFile(dex_location, 887 dex_location_checksum); 888 return oat_dex_file->OpenDexFile(error_msg); 889 } 890 891 // Look for an existing file next to dex. for example, for 892 // /foo/bar/baz.jar, look for /foo/bar/baz.odex. 893 std::string odex_filename(OatFile::DexFilenameToOdexFilename(dex_location)); 894 bool open_failed; 895 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(odex_filename, dex_location, 896 error_msg, &open_failed); 897 if (dex_file != nullptr) { 898 return dex_file; 899 } 900 if (dex_location_checksum == nullptr) { 901 *error_msg = StringPrintf("Failed to open oat file from %s and no classes.dex found in %s: %s", 902 odex_filename.c_str(), dex_location, error_msg->c_str()); 903 return nullptr; 904 } 905 906 std::string cache_error_msg; 907 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location)); 908 dex_file = VerifyAndOpenDexFileFromOatFile(cache_location, dex_location, &cache_error_msg, 909 &open_failed); 910 if (dex_file != nullptr) { 911 return dex_file; 912 } 913 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 914 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 915 } 916 VLOG(class_linker) << "Failed to open oat file from " << odex_filename 917 << " (error '" << *error_msg << "') or " << cache_location 918 << " (error '" << cache_error_msg << "')."; 919 920 // Try to generate oat file if it wasn't found or was obsolete. 921 error_msg->clear(); 922 return FindOrCreateOatFileForDexLocation(dex_location, *dex_location_checksum, 923 cache_location.c_str(), error_msg); 924} 925 926const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 927 ReaderMutexLock mu(Thread::Current(), dex_lock_); 928 for (size_t i = 0; i < oat_files_.size(); i++) { 929 const OatFile* oat_file = oat_files_[i]; 930 DCHECK(oat_file != nullptr); 931 if (oat_file->GetLocation() == oat_location) { 932 return oat_file; 933 } 934 } 935 return nullptr; 936} 937 938const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 939 std::string* error_msg) { 940 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 941 if (oat_file != nullptr) { 942 return oat_file; 943 } 944 945 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 946 error_msg); 947 if (oat_file == NULL) { 948 return NULL; 949 } 950 return oat_file; 951} 952 953static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 954 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 955 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 956 957 DCHECK(obj != NULL); 958 DCHECK(class_linker != NULL); 959 960 if (obj->IsArtMethod()) { 961 mirror::ArtMethod* method = obj->AsArtMethod(); 962 if (!method->IsNative()) { 963 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 964 if (method != Runtime::Current()->GetResolutionMethod()) { 965 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 966 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 967 } 968 } 969 } 970} 971 972void ClassLinker::InitFromImage() { 973 VLOG(startup) << "ClassLinker::InitFromImage entering"; 974 CHECK(!init_done_); 975 976 Thread* self = Thread::Current(); 977 gc::Heap* heap = Runtime::Current()->GetHeap(); 978 gc::space::ImageSpace* space = heap->GetImageSpace(); 979 dex_cache_image_class_lookup_required_ = true; 980 CHECK(space != NULL); 981 OatFile& oat_file = GetImageOatFile(space); 982 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 983 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 984 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 985 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 986 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 987 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 988 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 989 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 990 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 991 mirror::ObjectArray<mirror::DexCache>* dex_caches = 992 dex_caches_object->AsObjectArray<mirror::DexCache>(); 993 994 SirtRef<mirror::ObjectArray<mirror::Class> > class_roots( 995 self, 996 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>()); 997 class_roots_ = class_roots.get(); 998 999 // Special case of setting up the String class early so that we can test arbitrary objects 1000 // as being Strings or not 1001 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1002 1003 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1004 static_cast<uint32_t>(dex_caches->GetLength())); 1005 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1006 SirtRef<mirror::DexCache> dex_cache(self, dex_caches->Get(i)); 1007 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1008 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1009 nullptr); 1010 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1011 std::string error_msg; 1012 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1013 if (dex_file == NULL) { 1014 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1015 << " from within oat file " << oat_file.GetLocation() 1016 << " error '" << error_msg << "'"; 1017 } 1018 1019 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1020 1021 AppendToBootClassPath(*dex_file, dex_cache); 1022 } 1023 1024 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1025 // bitmap walk. 1026 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1027 1028 // Set entry point to interpreter if in InterpretOnly mode. 1029 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1030 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1031 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1032 } 1033 1034 // reinit class_roots_ 1035 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1036 class_roots_ = class_roots.get(); 1037 1038 // reinit array_iftable_ from any array class instance, they should be == 1039 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1040 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1041 // String class root was set above 1042 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1043 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1044 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1045 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1046 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1047 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1048 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1049 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1050 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1051 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1052 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1053 1054 FinishInit(self); 1055 1056 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1057} 1058 1059// Keep in sync with InitCallback. Anything we visit, we need to 1060// reinit references to when reinitializing a ClassLinker from a 1061// mapped image. 1062void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1063 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1064 Thread* self = Thread::Current(); 1065 { 1066 ReaderMutexLock mu(self, dex_lock_); 1067 if ((flags & kVisitRootFlagAllRoots) != 0) { 1068 for (mirror::DexCache*& dex_cache : dex_caches_) { 1069 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1070 } 1071 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1072 for (size_t index : new_dex_cache_roots_) { 1073 callback(reinterpret_cast<mirror::Object**>(&dex_caches_[index]), arg, 0, kRootVMInternal); 1074 } 1075 } 1076 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1077 new_dex_cache_roots_.clear(); 1078 } 1079 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1080 log_new_dex_caches_roots_ = true; 1081 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1082 log_new_dex_caches_roots_ = false; 1083 } 1084 } 1085 { 1086 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 1087 if ((flags & kVisitRootFlagAllRoots) != 0) { 1088 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1089 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1090 } 1091 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1092 for (auto& pair : new_class_roots_) { 1093 mirror::Object* old_ref = pair.second; 1094 callback(reinterpret_cast<mirror::Object**>(&pair.second), arg, 0, kRootStickyClass); 1095 if (UNLIKELY(pair.second != old_ref)) { 1096 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1097 // corresponding object. This is slow, but luckily for us, this may only happen with a 1098 // concurrent moving GC. 1099 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1100 it != end && it->first == pair.first; ++it) { 1101 // If the class stored matches the old class, update it to the new value. 1102 if (old_ref == it->second) { 1103 it->second = pair.second; 1104 } 1105 } 1106 } 1107 } 1108 } 1109 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1110 new_class_roots_.clear(); 1111 } 1112 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1113 log_new_class_table_roots_ = true; 1114 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1115 log_new_class_table_roots_ = false; 1116 } 1117 // We deliberately ignore the class roots in the image since we 1118 // handle image roots by using the MS/CMS rescanning of dirty cards. 1119 } 1120 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1121 DCHECK(array_iftable_ != nullptr); 1122 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1123 if (find_array_class_cache_[i] != nullptr) { 1124 callback(reinterpret_cast<mirror::Object**>(&find_array_class_cache_[i]), arg, 0, 1125 kRootVMInternal); 1126 } 1127 } 1128} 1129 1130void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1131 if (dex_cache_image_class_lookup_required_) { 1132 MoveImageClassesToClassTable(); 1133 } 1134 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1135 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 1136 if (!visitor(it.second, arg)) { 1137 return; 1138 } 1139 } 1140} 1141 1142static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1143 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1144 classes->insert(c); 1145 return true; 1146} 1147 1148void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1149 std::set<mirror::Class*> classes; 1150 VisitClasses(GetClassesVisitor, &classes); 1151 for (mirror::Class* klass : classes) { 1152 if (!visitor(klass, arg)) { 1153 return; 1154 } 1155 } 1156} 1157 1158ClassLinker::~ClassLinker() { 1159 mirror::Class::ResetClass(); 1160 mirror::String::ResetClass(); 1161 mirror::ArtField::ResetClass(); 1162 mirror::ArtMethod::ResetClass(); 1163 mirror::BooleanArray::ResetArrayClass(); 1164 mirror::ByteArray::ResetArrayClass(); 1165 mirror::CharArray::ResetArrayClass(); 1166 mirror::DoubleArray::ResetArrayClass(); 1167 mirror::FloatArray::ResetArrayClass(); 1168 mirror::IntArray::ResetArrayClass(); 1169 mirror::LongArray::ResetArrayClass(); 1170 mirror::ShortArray::ResetArrayClass(); 1171 mirror::Throwable::ResetClass(); 1172 mirror::StackTraceElement::ResetClass(); 1173 STLDeleteElements(&boot_class_path_); 1174 STLDeleteElements(&oat_files_); 1175} 1176 1177mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1178 gc::Heap* heap = Runtime::Current()->GetHeap(); 1179 SirtRef<mirror::Class> dex_cache_class(self, GetClassRoot(kJavaLangDexCache)); 1180 SirtRef<mirror::DexCache> dex_cache( 1181 self, down_cast<mirror::DexCache*>( 1182 heap->AllocObject<true>(self, dex_cache_class.get(), dex_cache_class->GetObjectSize()))); 1183 if (dex_cache.get() == NULL) { 1184 return NULL; 1185 } 1186 SirtRef<mirror::String> 1187 location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str())); 1188 if (location.get() == NULL) { 1189 return NULL; 1190 } 1191 SirtRef<mirror::ObjectArray<mirror::String> > 1192 strings(self, AllocStringArray(self, dex_file.NumStringIds())); 1193 if (strings.get() == NULL) { 1194 return NULL; 1195 } 1196 SirtRef<mirror::ObjectArray<mirror::Class> > 1197 types(self, AllocClassArray(self, dex_file.NumTypeIds())); 1198 if (types.get() == NULL) { 1199 return NULL; 1200 } 1201 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 1202 methods(self, AllocArtMethodArray(self, dex_file.NumMethodIds())); 1203 if (methods.get() == NULL) { 1204 return NULL; 1205 } 1206 SirtRef<mirror::ObjectArray<mirror::ArtField> > 1207 fields(self, AllocArtFieldArray(self, dex_file.NumFieldIds())); 1208 if (fields.get() == NULL) { 1209 return NULL; 1210 } 1211 dex_cache->Init(&dex_file, location.get(), strings.get(), types.get(), methods.get(), 1212 fields.get()); 1213 return dex_cache.get(); 1214} 1215 1216// Used to initialize a class in the allocation code path to ensure it is guarded by a StoreStore 1217// fence. 1218class InitializeClassVisitor { 1219 public: 1220 explicit InitializeClassVisitor(uint32_t class_size) : class_size_(class_size) { 1221 } 1222 1223 void operator()(mirror::Object* obj, size_t usable_size) const 1224 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1225 DCHECK_LE(class_size_, usable_size); 1226 // Avoid AsClass as object is not yet in live bitmap or allocation stack. 1227 mirror::Class* klass = down_cast<mirror::Class*>(obj); 1228 // DCHECK(klass->IsClass()); 1229 klass->SetClassSize(class_size_); 1230 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1231 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1232 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1233 } 1234 1235 private: 1236 const uint32_t class_size_; 1237 1238 DISALLOW_COPY_AND_ASSIGN(InitializeClassVisitor); 1239}; 1240 1241mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1242 uint32_t class_size) { 1243 DCHECK_GE(class_size, sizeof(mirror::Class)); 1244 gc::Heap* heap = Runtime::Current()->GetHeap(); 1245 InitializeClassVisitor visitor(class_size); 1246 mirror::Object* k = 1247 kMovingClasses ? heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) 1248 : heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1249 if (UNLIKELY(k == nullptr)) { 1250 CHECK(self->IsExceptionPending()); // OOME. 1251 return nullptr; 1252 } 1253 return k->AsClass(); 1254} 1255 1256mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1257 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1258} 1259 1260mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1261 return down_cast<mirror::ArtField*>( 1262 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1263} 1264 1265mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1266 return down_cast<mirror::ArtMethod*>( 1267 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1268} 1269 1270mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1271 Thread* self, size_t length) { 1272 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1273 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1274} 1275 1276static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1277 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1278 DCHECK(klass != NULL); 1279 // Wait for the class if it has not already been linked. 1280 if (!klass->IsResolved() && !klass->IsErroneous()) { 1281 SirtRef<mirror::Class> sirt_class(self, klass); 1282 ObjectLock<mirror::Class> lock(self, &sirt_class); 1283 // Check for circular dependencies between classes. 1284 if (!sirt_class->IsResolved() && sirt_class->GetClinitThreadId() == self->GetTid()) { 1285 ThrowClassCircularityError(sirt_class.get()); 1286 sirt_class->SetStatus(mirror::Class::kStatusError, self); 1287 return nullptr; 1288 } 1289 // Wait for the pending initialization to complete. 1290 while (!sirt_class->IsResolved() && !sirt_class->IsErroneous()) { 1291 lock.WaitIgnoringInterrupts(); 1292 } 1293 klass = sirt_class.get(); 1294 } 1295 if (klass->IsErroneous()) { 1296 ThrowEarlierClassFailure(klass); 1297 return nullptr; 1298 } 1299 // Return the loaded class. No exceptions should be pending. 1300 CHECK(klass->IsResolved()) << PrettyClass(klass); 1301 self->AssertNoPendingException(); 1302 return klass; 1303} 1304 1305mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1306 const SirtRef<mirror::ClassLoader>& class_loader) { 1307 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1308 DCHECK(self != nullptr); 1309 self->AssertNoPendingException(); 1310 if (descriptor[1] == '\0') { 1311 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1312 // for primitive classes that aren't backed by dex files. 1313 return FindPrimitiveClass(descriptor[0]); 1314 } 1315 // Find the class in the loaded classes table. 1316 mirror::Class* klass = LookupClass(descriptor, class_loader.get()); 1317 if (klass != NULL) { 1318 return EnsureResolved(self, klass); 1319 } 1320 // Class is not yet loaded. 1321 if (descriptor[0] == '[') { 1322 return CreateArrayClass(self, descriptor, class_loader); 1323 } else if (class_loader.get() == nullptr) { 1324 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1325 if (pair.second != NULL) { 1326 SirtRef<mirror::ClassLoader> class_loader(self, nullptr); 1327 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1328 } 1329 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1330 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1331 // throw of a NoClassDefFoundError. 1332 if (IsInBootClassPath(descriptor)) { 1333 mirror::Class* system_class = FindSystemClass(self, descriptor); 1334 CHECK(system_class != NULL); 1335 return system_class; 1336 } 1337 // Next try the compile time class path. 1338 const std::vector<const DexFile*>* class_path; 1339 { 1340 ScopedObjectAccessUnchecked soa(self); 1341 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1342 soa.AddLocalReference<jobject>(class_loader.get())); 1343 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1344 } 1345 1346 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1347 if (pair.second != NULL) { 1348 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1349 } 1350 1351 } else { 1352 ScopedObjectAccessUnchecked soa(self); 1353 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1354 soa.AddLocalReference<jobject>(class_loader.get())); 1355 std::string class_name_string(DescriptorToDot(descriptor)); 1356 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1357 { 1358 ScopedThreadStateChange tsc(self, kNative); 1359 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1360 soa.Env()->NewStringUTF(class_name_string.c_str())); 1361 if (class_name_object.get() == NULL) { 1362 return NULL; 1363 } 1364 CHECK(class_loader_object.get() != NULL); 1365 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1366 WellKnownClasses::java_lang_ClassLoader_loadClass, 1367 class_name_object.get())); 1368 } 1369 if (self->IsExceptionPending()) { 1370 // If the ClassLoader threw, pass that exception up. 1371 return NULL; 1372 } else if (result.get() == NULL) { 1373 // broken loader - throw NPE to be compatible with Dalvik 1374 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1375 class_name_string.c_str()).c_str()); 1376 return NULL; 1377 } else { 1378 // success, return mirror::Class* 1379 return soa.Decode<mirror::Class*>(result.get()); 1380 } 1381 } 1382 1383 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1384 return NULL; 1385} 1386 1387mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1388 const SirtRef<mirror::ClassLoader>& class_loader, 1389 const DexFile& dex_file, 1390 const DexFile::ClassDef& dex_class_def) { 1391 Thread* self = Thread::Current(); 1392 SirtRef<mirror::Class> klass(self, NULL); 1393 // Load the class from the dex file. 1394 if (UNLIKELY(!init_done_)) { 1395 // finish up init of hand crafted class_roots_ 1396 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1397 klass.reset(GetClassRoot(kJavaLangObject)); 1398 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1399 klass.reset(GetClassRoot(kJavaLangClass)); 1400 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1401 klass.reset(GetClassRoot(kJavaLangString)); 1402 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1403 klass.reset(GetClassRoot(kJavaLangDexCache)); 1404 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1405 klass.reset(GetClassRoot(kJavaLangReflectArtField)); 1406 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1407 klass.reset(GetClassRoot(kJavaLangReflectArtMethod)); 1408 } else { 1409 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1410 } 1411 } else { 1412 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1413 } 1414 if (UNLIKELY(klass.get() == NULL)) { 1415 CHECK(self->IsExceptionPending()); // Expect an OOME. 1416 return NULL; 1417 } 1418 klass->SetDexCache(FindDexCache(dex_file)); 1419 LoadClass(dex_file, dex_class_def, klass, class_loader.get()); 1420 // Check for a pending exception during load 1421 if (self->IsExceptionPending()) { 1422 klass->SetStatus(mirror::Class::kStatusError, self); 1423 return NULL; 1424 } 1425 ObjectLock<mirror::Class> lock(self, &klass); 1426 klass->SetClinitThreadId(self->GetTid()); 1427 // Add the newly loaded class to the loaded classes table. 1428 mirror::Class* existing = InsertClass(descriptor, klass.get(), Hash(descriptor)); 1429 if (existing != NULL) { 1430 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1431 // this thread to block. 1432 return EnsureResolved(self, existing); 1433 } 1434 // Finish loading (if necessary) by finding parents 1435 CHECK(!klass->IsLoaded()); 1436 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1437 // Loading failed. 1438 klass->SetStatus(mirror::Class::kStatusError, self); 1439 return NULL; 1440 } 1441 CHECK(klass->IsLoaded()); 1442 // Link the class (if necessary) 1443 CHECK(!klass->IsResolved()); 1444 // TODO: Use fast jobjects? 1445 SirtRef<mirror::ObjectArray<mirror::Class> > interfaces(self, nullptr); 1446 if (!LinkClass(self, klass, interfaces)) { 1447 // Linking failed. 1448 klass->SetStatus(mirror::Class::kStatusError, self); 1449 return NULL; 1450 } 1451 CHECK(klass->IsResolved()); 1452 1453 /* 1454 * We send CLASS_PREPARE events to the debugger from here. The 1455 * definition of "preparation" is creating the static fields for a 1456 * class and initializing them to the standard default values, but not 1457 * executing any code (that comes later, during "initialization"). 1458 * 1459 * We did the static preparation in LinkClass. 1460 * 1461 * The class has been prepared and resolved but possibly not yet verified 1462 * at this point. 1463 */ 1464 Dbg::PostClassPrepare(klass.get()); 1465 1466 return klass.get(); 1467} 1468 1469// Precomputes size that will be needed for Class, matching LinkStaticFields 1470uint32_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1471 const DexFile::ClassDef& dex_class_def) { 1472 const byte* class_data = dex_file.GetClassData(dex_class_def); 1473 size_t num_ref = 0; 1474 size_t num_32 = 0; 1475 size_t num_64 = 0; 1476 if (class_data != NULL) { 1477 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1478 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1479 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1480 char c = descriptor[0]; 1481 if (c == 'L' || c == '[') { 1482 num_ref++; 1483 } else if (c == 'J' || c == 'D') { 1484 num_64++; 1485 } else { 1486 num_32++; 1487 } 1488 } 1489 } 1490 // start with generic class data 1491 uint32_t size = sizeof(mirror::Class); 1492 // follow with reference fields which must be contiguous at start 1493 size += (num_ref * sizeof(uint32_t)); 1494 // if there are 64-bit fields to add, make sure they are aligned 1495 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1496 if (num_32 != 0) { 1497 // use an available 32-bit field for padding 1498 num_32--; 1499 } 1500 size += sizeof(uint32_t); // either way, we are adding a word 1501 DCHECK_EQ(size, RoundUp(size, 8)); 1502 } 1503 // tack on any 64-bit fields now that alignment is assured 1504 size += (num_64 * sizeof(uint64_t)); 1505 // tack on any remaining 32-bit fields 1506 size += (num_32 * sizeof(uint32_t)); 1507 return size; 1508} 1509 1510const OatFile::OatClass* ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1511 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1512 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1513 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1514 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1515 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1516 &dex_location_checksum); 1517 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1518 const OatFile::OatClass* oat_class = oat_dex_file->GetOatClass(class_def_idx); 1519 CHECK(oat_class != NULL) << dex_file.GetLocation() << " " << class_def_idx; 1520 return oat_class; 1521} 1522 1523static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1524 uint32_t method_idx) { 1525 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1526 const byte* class_data = dex_file.GetClassData(class_def); 1527 CHECK(class_data != NULL); 1528 ClassDataItemIterator it(dex_file, class_data); 1529 // Skip fields 1530 while (it.HasNextStaticField()) { 1531 it.Next(); 1532 } 1533 while (it.HasNextInstanceField()) { 1534 it.Next(); 1535 } 1536 // Process methods 1537 size_t class_def_method_index = 0; 1538 while (it.HasNextDirectMethod()) { 1539 if (it.GetMemberIndex() == method_idx) { 1540 return class_def_method_index; 1541 } 1542 class_def_method_index++; 1543 it.Next(); 1544 } 1545 while (it.HasNextVirtualMethod()) { 1546 if (it.GetMemberIndex() == method_idx) { 1547 return class_def_method_index; 1548 } 1549 class_def_method_index++; 1550 it.Next(); 1551 } 1552 DCHECK(!it.HasNext()); 1553 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1554 return 0; 1555} 1556 1557const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1558 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1559 // method for direct methods (or virtual methods made direct). 1560 mirror::Class* declaring_class = method->GetDeclaringClass(); 1561 size_t oat_method_index; 1562 if (method->IsStatic() || method->IsDirect()) { 1563 // Simple case where the oat method index was stashed at load time. 1564 oat_method_index = method->GetMethodIndex(); 1565 } else { 1566 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1567 // by search for its position in the declared virtual methods. 1568 oat_method_index = declaring_class->NumDirectMethods(); 1569 size_t end = declaring_class->NumVirtualMethods(); 1570 bool found = false; 1571 for (size_t i = 0; i < end; i++) { 1572 if (declaring_class->GetVirtualMethod(i) == method) { 1573 found = true; 1574 break; 1575 } 1576 oat_method_index++; 1577 } 1578 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1579 } 1580 UniquePtr<const OatFile::OatClass> 1581 oat_class(GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1582 declaring_class->GetDexClassDefIndex())); 1583 CHECK(oat_class.get() != NULL); 1584 DCHECK_EQ(oat_method_index, 1585 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1586 method->GetDeclaringClass()->GetDexClassDefIndex(), 1587 method->GetDexMethodIndex())); 1588 1589 return oat_class->GetOatMethod(oat_method_index); 1590} 1591 1592// Special case to get oat code without overwriting a trampoline. 1593const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1594 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1595 if (method->IsProxyMethod()) { 1596 return GetQuickProxyInvokeHandler(); 1597 } 1598 const void* result = GetOatMethodFor(method).GetQuickCode(); 1599 if (result == nullptr) { 1600 if (method->IsPortableCompiled()) { 1601 // No code? Do we expect portable code? 1602 result = GetQuickToPortableBridge(); 1603 } else { 1604 // No code? You must mean to go into the interpreter. 1605 result = GetQuickToInterpreterBridge(); 1606 } 1607 } 1608 return result; 1609} 1610 1611const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1612 bool* have_portable_code) { 1613 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1614 *have_portable_code = false; 1615 if (method->IsProxyMethod()) { 1616 return GetPortableProxyInvokeHandler(); 1617 } 1618 const void* result = GetOatMethodFor(method).GetPortableCode(); 1619 if (result == nullptr) { 1620 if (GetOatMethodFor(method).GetQuickCode() == nullptr) { 1621 // No code? You must mean to go into the interpreter. 1622 result = GetPortableToInterpreterBridge(); 1623 } else { 1624 // No code? But there's quick code, so use a bridge. 1625 result = GetPortableToQuickBridge(); 1626 } 1627 } else { 1628 *have_portable_code = true; 1629 } 1630 return result; 1631} 1632 1633const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1634 uint32_t method_idx) { 1635 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1636 CHECK(oat_class.get() != nullptr); 1637 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1638 return oat_class->GetOatMethod(oat_method_idx).GetQuickCode(); 1639} 1640 1641const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1642 uint32_t method_idx) { 1643 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1644 CHECK(oat_class.get() != nullptr); 1645 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1646 return oat_class->GetOatMethod(oat_method_idx).GetPortableCode(); 1647} 1648 1649// Returns true if the method must run with interpreter, false otherwise. 1650static bool NeedsInterpreter(mirror::ArtMethod* method, const void* quick_code, 1651 const void* portable_code) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1652 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1653 // No code: need interpreter. 1654 // May return true for native code, in the case of generic JNI 1655 // DCHECK(!method->IsNative()); 1656 return true; 1657 } 1658#ifdef ART_SEA_IR_MODE 1659 ScopedObjectAccess soa(Thread::Current()); 1660 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1661 LOG(INFO) << "Found " << PrettyMethod(method); 1662 return false; 1663 } 1664#endif 1665 // If interpreter mode is enabled, every method (except native and proxy) must 1666 // be run with interpreter. 1667 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1668 !method->IsNative() && !method->IsProxyMethod(); 1669} 1670 1671void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1672 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1673 if (klass->NumDirectMethods() == 0) { 1674 return; // No direct methods => no static methods. 1675 } 1676 Runtime* runtime = Runtime::Current(); 1677 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1678 return; // OAT file unavailable. 1679 } 1680 ClassHelper kh(klass); 1681 const DexFile& dex_file = kh.GetDexFile(); 1682 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 1683 CHECK(dex_class_def != nullptr); 1684 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1685 // There should always be class data if there were direct methods. 1686 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1687 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1688 CHECK(oat_class.get() != nullptr); 1689 ClassDataItemIterator it(dex_file, class_data); 1690 // Skip fields 1691 while (it.HasNextStaticField()) { 1692 it.Next(); 1693 } 1694 while (it.HasNextInstanceField()) { 1695 it.Next(); 1696 } 1697 // Link the code of methods skipped by LinkCode. 1698 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1699 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1700 if (!method->IsStatic()) { 1701 // Only update static methods. 1702 continue; 1703 } 1704 const void* portable_code = oat_class->GetOatMethod(method_index).GetPortableCode(); 1705 const void* quick_code = oat_class->GetOatMethod(method_index).GetQuickCode(); 1706 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1707 bool have_portable_code = false; 1708 if (enter_interpreter) { 1709 // Use interpreter entry point. 1710 1711 // check whether the method is native, in which case it's generic JNI 1712 portable_code = GetPortableToInterpreterBridge(); 1713 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 1714 quick_code = GetQuickGenericJniTrampoline(); 1715 } else { 1716 quick_code = GetQuickToInterpreterBridge(); 1717 } 1718 } else { 1719 if (portable_code == nullptr) { 1720 portable_code = GetPortableToQuickBridge(); 1721 } else { 1722 have_portable_code = true; 1723 } 1724 if (quick_code == nullptr) { 1725 quick_code = GetQuickToPortableBridge(); 1726 } 1727 } 1728 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1729 have_portable_code); 1730 } 1731 // Ignore virtual methods on the iterator. 1732} 1733 1734static void LinkCode(const SirtRef<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class, 1735 uint32_t method_index) 1736 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1737 // Method shouldn't have already been linked. 1738 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1739 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1740 // Every kind of method should at least get an invoke stub from the oat_method. 1741 // non-abstract methods also get their code pointers. 1742 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1743 oat_method.LinkMethod(method.get()); 1744 1745 // Install entry point from interpreter. 1746 Runtime* runtime = Runtime::Current(); 1747 bool enter_interpreter = NeedsInterpreter(method.get(), 1748 method->GetEntryPointFromQuickCompiledCode(), 1749 method->GetEntryPointFromPortableCompiledCode()); 1750 if (enter_interpreter) { 1751 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1752 } else { 1753 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1754 } 1755 1756 if (method->IsAbstract()) { 1757 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1758 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1759 return; 1760 } 1761 1762 bool have_portable_code = false; 1763 if (method->IsStatic() && !method->IsConstructor()) { 1764 // For static methods excluding the class initializer, install the trampoline. 1765 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1766 // after initializing class (see ClassLinker::InitializeClass method). 1767 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline(runtime->GetClassLinker())); 1768 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline(runtime->GetClassLinker())); 1769 } else if (enter_interpreter) { 1770 // Set entry point from compiled code if there's no code or in interpreter only mode. 1771 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1772 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1773 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1774 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1775 have_portable_code = true; 1776 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1777 } else { 1778 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1779 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1780 } 1781 1782 if (method->IsNative()) { 1783 // Unregistering restores the dlsym lookup stub. 1784 method->UnregisterNative(Thread::Current()); 1785 } 1786 1787 // Allow instrumentation its chance to hijack code. 1788 runtime->GetInstrumentation()->UpdateMethodsCode(method.get(), 1789 method->GetEntryPointFromQuickCompiledCode(), 1790 method->GetEntryPointFromPortableCompiledCode(), 1791 have_portable_code); 1792} 1793 1794void ClassLinker::LoadClass(const DexFile& dex_file, 1795 const DexFile::ClassDef& dex_class_def, 1796 const SirtRef<mirror::Class>& klass, 1797 mirror::ClassLoader* class_loader) { 1798 CHECK(klass.get() != NULL); 1799 CHECK(klass->GetDexCache() != NULL); 1800 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1801 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1802 CHECK(descriptor != NULL); 1803 1804 klass->SetClass(GetClassRoot(kJavaLangClass)); 1805 if (kUseBrooksPointer) { 1806 klass->AssertSelfBrooksPointer(); 1807 } 1808 uint32_t access_flags = dex_class_def.access_flags_; 1809 // Make sure that none of our runtime-only flags are set. 1810 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1811 klass->SetAccessFlags(access_flags); 1812 klass->SetClassLoader(class_loader); 1813 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1814 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1815 1816 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1817 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1818 1819 // Load fields fields. 1820 const byte* class_data = dex_file.GetClassData(dex_class_def); 1821 if (class_data == NULL) { 1822 return; // no fields or methods - for example a marker interface 1823 } 1824 ClassDataItemIterator it(dex_file, class_data); 1825 Thread* self = Thread::Current(); 1826 if (it.NumStaticFields() != 0) { 1827 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1828 if (UNLIKELY(statics == NULL)) { 1829 CHECK(self->IsExceptionPending()); // OOME. 1830 return; 1831 } 1832 klass->SetSFields(statics); 1833 } 1834 if (it.NumInstanceFields() != 0) { 1835 mirror::ObjectArray<mirror::ArtField>* fields = 1836 AllocArtFieldArray(self, it.NumInstanceFields()); 1837 if (UNLIKELY(fields == NULL)) { 1838 CHECK(self->IsExceptionPending()); // OOME. 1839 return; 1840 } 1841 klass->SetIFields(fields); 1842 } 1843 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1844 SirtRef<mirror::ArtField> sfield(self, AllocArtField(self)); 1845 if (UNLIKELY(sfield.get() == NULL)) { 1846 CHECK(self->IsExceptionPending()); // OOME. 1847 return; 1848 } 1849 klass->SetStaticField(i, sfield.get()); 1850 LoadField(dex_file, it, klass, sfield); 1851 } 1852 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1853 SirtRef<mirror::ArtField> ifield(self, AllocArtField(self)); 1854 if (UNLIKELY(ifield.get() == NULL)) { 1855 CHECK(self->IsExceptionPending()); // OOME. 1856 return; 1857 } 1858 klass->SetInstanceField(i, ifield.get()); 1859 LoadField(dex_file, it, klass, ifield); 1860 } 1861 1862 UniquePtr<const OatFile::OatClass> oat_class; 1863 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1864 oat_class.reset(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1865 } 1866 1867 // Load methods. 1868 if (it.NumDirectMethods() != 0) { 1869 // TODO: append direct methods to class object 1870 mirror::ObjectArray<mirror::ArtMethod>* directs = 1871 AllocArtMethodArray(self, it.NumDirectMethods()); 1872 if (UNLIKELY(directs == NULL)) { 1873 CHECK(self->IsExceptionPending()); // OOME. 1874 return; 1875 } 1876 klass->SetDirectMethods(directs); 1877 } 1878 if (it.NumVirtualMethods() != 0) { 1879 // TODO: append direct methods to class object 1880 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1881 AllocArtMethodArray(self, it.NumVirtualMethods()); 1882 if (UNLIKELY(virtuals == NULL)) { 1883 CHECK(self->IsExceptionPending()); // OOME. 1884 return; 1885 } 1886 klass->SetVirtualMethods(virtuals); 1887 } 1888 size_t class_def_method_index = 0; 1889 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1890 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1891 if (UNLIKELY(method.get() == NULL)) { 1892 CHECK(self->IsExceptionPending()); // OOME. 1893 return; 1894 } 1895 klass->SetDirectMethod(i, method.get()); 1896 if (oat_class.get() != NULL) { 1897 LinkCode(method, oat_class.get(), class_def_method_index); 1898 } 1899 method->SetMethodIndex(class_def_method_index); 1900 class_def_method_index++; 1901 } 1902 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1903 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1904 if (UNLIKELY(method.get() == NULL)) { 1905 CHECK(self->IsExceptionPending()); // OOME. 1906 return; 1907 } 1908 klass->SetVirtualMethod(i, method.get()); 1909 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1910 if (oat_class.get() != NULL) { 1911 LinkCode(method, oat_class.get(), class_def_method_index); 1912 } 1913 class_def_method_index++; 1914 } 1915 DCHECK(!it.HasNext()); 1916} 1917 1918void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1919 const SirtRef<mirror::Class>& klass, 1920 const SirtRef<mirror::ArtField>& dst) { 1921 uint32_t field_idx = it.GetMemberIndex(); 1922 dst->SetDexFieldIndex(field_idx); 1923 dst->SetDeclaringClass(klass.get()); 1924 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1925} 1926 1927mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1928 const ClassDataItemIterator& it, 1929 const SirtRef<mirror::Class>& klass) { 1930 uint32_t dex_method_idx = it.GetMemberIndex(); 1931 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1932 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 1933 1934 mirror::ArtMethod* dst = AllocArtMethod(self); 1935 if (UNLIKELY(dst == NULL)) { 1936 CHECK(self->IsExceptionPending()); // OOME. 1937 return NULL; 1938 } 1939 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 1940 1941 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 1942 dst->SetDexMethodIndex(dex_method_idx); 1943 dst->SetDeclaringClass(klass.get()); 1944 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 1945 1946 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 1947 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 1948 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 1949 1950 uint32_t access_flags = it.GetMemberAccessFlags(); 1951 1952 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 1953 // Set finalizable flag on declaring class. 1954 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 1955 // Void return type. 1956 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 1957 klass->SetFinalizable(); 1958 } else { 1959 ClassHelper kh(klass.get()); 1960 const char* klass_descriptor = kh.GetDescriptor(); 1961 // The Enum class declares a "final" finalize() method to prevent subclasses from 1962 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 1963 // subclasses, so we exclude it here. 1964 // We also want to avoid setting the flag on Object, where we know that finalize() is 1965 // empty. 1966 if ((strcmp("Ljava/lang/Object;", klass_descriptor) != 0) && 1967 (strcmp("Ljava/lang/Enum;", klass_descriptor) != 0)) { 1968 klass->SetFinalizable(); 1969 } 1970 } 1971 } 1972 } else if (method_name[0] == '<') { 1973 // Fix broken access flags for initializers. Bug 11157540. 1974 bool is_init = (strcmp("<init>", method_name) == 0); 1975 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 1976 if (UNLIKELY(!is_init && !is_clinit)) { 1977 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 1978 } else { 1979 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 1980 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 1981 << PrettyDescriptor(klass.get()) << " in dex file " << dex_file.GetLocation(); 1982 access_flags |= kAccConstructor; 1983 } 1984 } 1985 } 1986 dst->SetAccessFlags(access_flags); 1987 1988 self->EndAssertNoThreadSuspension(old_cause); 1989 return dst; 1990} 1991 1992void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 1993 Thread* self = Thread::Current(); 1994 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1995 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 1996 AppendToBootClassPath(dex_file, dex_cache); 1997} 1998 1999void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2000 const SirtRef<mirror::DexCache>& dex_cache) { 2001 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 2002 boot_class_path_.push_back(&dex_file); 2003 RegisterDexFile(dex_file, dex_cache); 2004} 2005 2006bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 2007 dex_lock_.AssertSharedHeld(Thread::Current()); 2008 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2009 if (dex_caches_[i]->GetDexFile() == &dex_file) { 2010 return true; 2011 } 2012 } 2013 return false; 2014} 2015 2016bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 2017 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2018 return IsDexFileRegisteredLocked(dex_file); 2019} 2020 2021void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2022 const SirtRef<mirror::DexCache>& dex_cache) { 2023 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2024 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 2025 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2026 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2027 dex_caches_.push_back(dex_cache.get()); 2028 dex_cache->SetDexFile(&dex_file); 2029 if (log_new_dex_caches_roots_) { 2030 // TODO: This is not safe if we can remove dex caches. 2031 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2032 } 2033} 2034 2035void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2036 Thread* self = Thread::Current(); 2037 { 2038 ReaderMutexLock mu(self, dex_lock_); 2039 if (IsDexFileRegisteredLocked(dex_file)) { 2040 return; 2041 } 2042 } 2043 // Don't alloc while holding the lock, since allocation may need to 2044 // suspend all threads and another thread may need the dex_lock_ to 2045 // get to a suspend point. 2046 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 2047 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2048 { 2049 WriterMutexLock mu(self, dex_lock_); 2050 if (IsDexFileRegisteredLocked(dex_file)) { 2051 return; 2052 } 2053 RegisterDexFileLocked(dex_file, dex_cache); 2054 } 2055} 2056 2057void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2058 const SirtRef<mirror::DexCache>& dex_cache) { 2059 WriterMutexLock mu(Thread::Current(), dex_lock_); 2060 RegisterDexFileLocked(dex_file, dex_cache); 2061} 2062 2063mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 2064 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2065 // Search assuming unique-ness of dex file. 2066 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2067 mirror::DexCache* dex_cache = dex_caches_[i]; 2068 if (dex_cache->GetDexFile() == &dex_file) { 2069 return dex_cache; 2070 } 2071 } 2072 // Search matching by location name. 2073 std::string location(dex_file.GetLocation()); 2074 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2075 mirror::DexCache* dex_cache = dex_caches_[i]; 2076 if (dex_cache->GetDexFile()->GetLocation() == location) { 2077 return dex_cache; 2078 } 2079 } 2080 // Failure, dump diagnostic and abort. 2081 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2082 mirror::DexCache* dex_cache = dex_caches_[i]; 2083 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2084 } 2085 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2086 return NULL; 2087} 2088 2089void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 2090 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2091 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2092 dex_caches_[i]->Fixup(resolution_method); 2093 } 2094} 2095 2096mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2097 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2098 if (UNLIKELY(klass == NULL)) { 2099 return NULL; 2100 } 2101 return InitializePrimitiveClass(klass, type); 2102} 2103 2104mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2105 Primitive::Type type) { 2106 CHECK(primitive_class != NULL); 2107 // Must hold lock on object when initializing. 2108 Thread* self = Thread::Current(); 2109 SirtRef<mirror::Class> sirt_class(self, primitive_class); 2110 ObjectLock<mirror::Class> lock(self, &sirt_class); 2111 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2112 primitive_class->SetPrimitiveType(type); 2113 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2114 const char* descriptor = Primitive::Descriptor(type); 2115 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2116 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2117 return primitive_class; 2118} 2119 2120// Create an array class (i.e. the class object for the array, not the 2121// array itself). "descriptor" looks like "[C" or "[[[[B" or 2122// "[Ljava/lang/String;". 2123// 2124// If "descriptor" refers to an array of primitives, look up the 2125// primitive type's internally-generated class object. 2126// 2127// "class_loader" is the class loader of the class that's referring to 2128// us. It's used to ensure that we're looking for the element type in 2129// the right context. It does NOT become the class loader for the 2130// array class; that always comes from the base element class. 2131// 2132// Returns NULL with an exception raised on failure. 2133mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2134 const SirtRef<mirror::ClassLoader>& class_loader) { 2135 // Identify the underlying component type 2136 CHECK_EQ('[', descriptor[0]); 2137 SirtRef<mirror::Class> component_type(self, FindClass(self, descriptor + 1, class_loader)); 2138 if (component_type.get() == nullptr) { 2139 DCHECK(self->IsExceptionPending()); 2140 return nullptr; 2141 } 2142 2143 // See if the component type is already loaded. Array classes are 2144 // always associated with the class loader of their underlying 2145 // element type -- an array of Strings goes with the loader for 2146 // java/lang/String -- so we need to look for it there. (The 2147 // caller should have checked for the existence of the class 2148 // before calling here, but they did so with *their* class loader, 2149 // not the component type's loader.) 2150 // 2151 // If we find it, the caller adds "loader" to the class' initiating 2152 // loader list, which should prevent us from going through this again. 2153 // 2154 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2155 // are the same, because our caller (FindClass) just did the 2156 // lookup. (Even if we get this wrong we still have correct behavior, 2157 // because we effectively do this lookup again when we add the new 2158 // class to the hash table --- necessary because of possible races with 2159 // other threads.) 2160 if (class_loader.get() != component_type->GetClassLoader()) { 2161 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2162 if (new_class != NULL) { 2163 return new_class; 2164 } 2165 } 2166 2167 // Fill out the fields in the Class. 2168 // 2169 // It is possible to execute some methods against arrays, because 2170 // all arrays are subclasses of java_lang_Object_, so we need to set 2171 // up a vtable. We can just point at the one in java_lang_Object_. 2172 // 2173 // Array classes are simple enough that we don't need to do a full 2174 // link step. 2175 SirtRef<mirror::Class> new_class(self, NULL); 2176 if (UNLIKELY(!init_done_)) { 2177 // Classes that were hand created, ie not by FindSystemClass 2178 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2179 new_class.reset(GetClassRoot(kClassArrayClass)); 2180 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2181 new_class.reset(GetClassRoot(kObjectArrayClass)); 2182 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2183 new_class.reset(GetClassRoot(kJavaLangStringArrayClass)); 2184 } else if (strcmp(descriptor, 2185 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2186 new_class.reset(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2187 } else if (strcmp(descriptor, 2188 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2189 new_class.reset(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2190 } else if (strcmp(descriptor, "[C") == 0) { 2191 new_class.reset(GetClassRoot(kCharArrayClass)); 2192 } else if (strcmp(descriptor, "[I") == 0) { 2193 new_class.reset(GetClassRoot(kIntArrayClass)); 2194 } 2195 } 2196 if (new_class.get() == nullptr) { 2197 new_class.reset(AllocClass(self, sizeof(mirror::Class))); 2198 if (new_class.get() == nullptr) { 2199 return nullptr; 2200 } 2201 new_class->SetComponentType(component_type.get()); 2202 } 2203 ObjectLock<mirror::Class> lock(self, &new_class); // Must hold lock on object when initializing. 2204 DCHECK(new_class->GetComponentType() != NULL); 2205 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2206 new_class->SetSuperClass(java_lang_Object); 2207 new_class->SetVTable(java_lang_Object->GetVTable()); 2208 new_class->SetPrimitiveType(Primitive::kPrimNot); 2209 new_class->SetClassLoader(component_type->GetClassLoader()); 2210 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2211 // don't need to set new_class->SetObjectSize(..) 2212 // because Object::SizeOf delegates to Array::SizeOf 2213 2214 2215 // All arrays have java/lang/Cloneable and java/io/Serializable as 2216 // interfaces. We need to set that up here, so that stuff like 2217 // "instanceof" works right. 2218 // 2219 // Note: The GC could run during the call to FindSystemClass, 2220 // so we need to make sure the class object is GC-valid while we're in 2221 // there. Do this by clearing the interface list so the GC will just 2222 // think that the entries are null. 2223 2224 2225 // Use the single, global copies of "interfaces" and "iftable" 2226 // (remember not to free them for arrays). 2227 CHECK(array_iftable_ != nullptr); 2228 new_class->SetIfTable(array_iftable_); 2229 2230 // Inherit access flags from the component type. 2231 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2232 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2233 access_flags &= kAccJavaFlagsMask; 2234 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2235 // and remove "interface". 2236 access_flags |= kAccAbstract | kAccFinal; 2237 access_flags &= ~kAccInterface; 2238 2239 new_class->SetAccessFlags(access_flags); 2240 2241 mirror::Class* existing = InsertClass(descriptor, new_class.get(), Hash(descriptor)); 2242 if (existing == nullptr) { 2243 return new_class.get(); 2244 } 2245 // Another thread must have loaded the class after we 2246 // started but before we finished. Abandon what we've 2247 // done. 2248 // 2249 // (Yes, this happens.) 2250 2251 return existing; 2252} 2253 2254mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2255 switch (Primitive::GetType(type)) { 2256 case Primitive::kPrimByte: 2257 return GetClassRoot(kPrimitiveByte); 2258 case Primitive::kPrimChar: 2259 return GetClassRoot(kPrimitiveChar); 2260 case Primitive::kPrimDouble: 2261 return GetClassRoot(kPrimitiveDouble); 2262 case Primitive::kPrimFloat: 2263 return GetClassRoot(kPrimitiveFloat); 2264 case Primitive::kPrimInt: 2265 return GetClassRoot(kPrimitiveInt); 2266 case Primitive::kPrimLong: 2267 return GetClassRoot(kPrimitiveLong); 2268 case Primitive::kPrimShort: 2269 return GetClassRoot(kPrimitiveShort); 2270 case Primitive::kPrimBoolean: 2271 return GetClassRoot(kPrimitiveBoolean); 2272 case Primitive::kPrimVoid: 2273 return GetClassRoot(kPrimitiveVoid); 2274 case Primitive::kPrimNot: 2275 break; 2276 } 2277 std::string printable_type(PrintableChar(type)); 2278 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2279 return NULL; 2280} 2281 2282mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2283 size_t hash) { 2284 if (VLOG_IS_ON(class_linker)) { 2285 mirror::DexCache* dex_cache = klass->GetDexCache(); 2286 std::string source; 2287 if (dex_cache != NULL) { 2288 source += " from "; 2289 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2290 } 2291 LOG(INFO) << "Loaded class " << descriptor << source; 2292 } 2293 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2294 mirror::Class* existing = 2295 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2296 if (existing != NULL) { 2297 return existing; 2298 } 2299 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2300 // Check a class loaded with the system class loader matches one in the image if the class 2301 // is in the image. 2302 existing = LookupClassFromImage(descriptor); 2303 if (existing != NULL) { 2304 CHECK(klass == existing); 2305 } 2306 } 2307 VerifyObject(klass); 2308 class_table_.insert(std::make_pair(hash, klass)); 2309 if (log_new_class_table_roots_) { 2310 new_class_roots_.push_back(std::make_pair(hash, klass)); 2311 } 2312 return NULL; 2313} 2314 2315bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2316 size_t hash = Hash(descriptor); 2317 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2318 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2319 ++it) { 2320 mirror::Class* klass = it->second; 2321 ClassHelper kh(klass); 2322 if ((klass->GetClassLoader() == class_loader) && 2323 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2324 class_table_.erase(it); 2325 return true; 2326 } 2327 } 2328 return false; 2329} 2330 2331mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2332 const mirror::ClassLoader* class_loader) { 2333 size_t hash = Hash(descriptor); 2334 { 2335 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2336 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2337 if (result != NULL) { 2338 return result; 2339 } 2340 } 2341 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2342 return NULL; 2343 } else { 2344 // Lookup failed but need to search dex_caches_. 2345 mirror::Class* result = LookupClassFromImage(descriptor); 2346 if (result != NULL) { 2347 InsertClass(descriptor, result, hash); 2348 } else { 2349 // Searching the image dex files/caches failed, we don't want to get into this situation 2350 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2351 // classes into the class table. 2352 const int32_t kMaxFailedDexCacheLookups = 1000; 2353 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2354 MoveImageClassesToClassTable(); 2355 } 2356 } 2357 return result; 2358 } 2359} 2360 2361mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2362 const mirror::ClassLoader* class_loader, 2363 size_t hash) { 2364 auto end = class_table_.end(); 2365 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2366 mirror::Class* klass = it->second; 2367 ClassHelper kh(klass); 2368 if ((klass->GetClassLoader() == class_loader) && 2369 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2370 if (kIsDebugBuild) { 2371 // Check for duplicates in the table. 2372 for (++it; it != end && it->first == hash; ++it) { 2373 mirror::Class* klass2 = it->second; 2374 ClassHelper kh(klass2); 2375 CHECK(!((klass2->GetClassLoader() == class_loader) && 2376 (strcmp(descriptor, kh.GetDescriptor()) == 0))) 2377 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2378 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2379 } 2380 } 2381 return klass; 2382 } 2383 } 2384 return NULL; 2385} 2386 2387static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2388 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2389 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2390 CHECK(image != NULL); 2391 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2392 return root->AsObjectArray<mirror::DexCache>(); 2393} 2394 2395void ClassLinker::MoveImageClassesToClassTable() { 2396 Thread* self = Thread::Current(); 2397 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2398 if (!dex_cache_image_class_lookup_required_) { 2399 return; // All dex cache classes are already in the class table. 2400 } 2401 const char* old_no_suspend_cause = 2402 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2403 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2404 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2405 mirror::DexCache* dex_cache = dex_caches->Get(i); 2406 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2407 for (int32_t j = 0; j < types->GetLength(); j++) { 2408 mirror::Class* klass = types->Get(j); 2409 if (klass != NULL) { 2410 ClassHelper kh(klass); 2411 DCHECK(klass->GetClassLoader() == NULL); 2412 const char* descriptor = kh.GetDescriptor(); 2413 size_t hash = Hash(descriptor); 2414 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 2415 if (existing != NULL) { 2416 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2417 << PrettyClassAndClassLoader(klass); 2418 } else { 2419 class_table_.insert(std::make_pair(hash, klass)); 2420 if (log_new_class_table_roots_) { 2421 new_class_roots_.push_back(std::make_pair(hash, klass)); 2422 } 2423 } 2424 } 2425 } 2426 } 2427 dex_cache_image_class_lookup_required_ = false; 2428 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2429} 2430 2431mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2432 Thread* self = Thread::Current(); 2433 const char* old_no_suspend_cause = 2434 self->StartAssertNoThreadSuspension("Image class lookup"); 2435 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2436 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2437 mirror::DexCache* dex_cache = dex_caches->Get(i); 2438 const DexFile* dex_file = dex_cache->GetDexFile(); 2439 // Try binary searching the string/type index. 2440 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2441 if (string_id != NULL) { 2442 const DexFile::TypeId* type_id = 2443 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2444 if (type_id != NULL) { 2445 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2446 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2447 if (klass != NULL) { 2448 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2449 return klass; 2450 } 2451 } 2452 } 2453 } 2454 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2455 return NULL; 2456} 2457 2458void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2459 result.clear(); 2460 if (dex_cache_image_class_lookup_required_) { 2461 MoveImageClassesToClassTable(); 2462 } 2463 size_t hash = Hash(descriptor); 2464 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2465 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2466 it != end && it->first == hash; ++it) { 2467 mirror::Class* klass = it->second; 2468 ClassHelper kh(klass); 2469 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2470 result.push_back(klass); 2471 } 2472 } 2473} 2474 2475void ClassLinker::VerifyClass(const SirtRef<mirror::Class>& klass) { 2476 // TODO: assert that the monitor on the Class is held 2477 Thread* self = Thread::Current(); 2478 ObjectLock<mirror::Class> lock(self, &klass); 2479 2480 // Don't attempt to re-verify if already sufficiently verified. 2481 if (klass->IsVerified() || 2482 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2483 return; 2484 } 2485 2486 // The class might already be erroneous, for example at compile time if we attempted to verify 2487 // this class as a parent to another. 2488 if (klass->IsErroneous()) { 2489 ThrowEarlierClassFailure(klass.get()); 2490 return; 2491 } 2492 2493 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2494 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2495 } else { 2496 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2497 << PrettyClass(klass.get()); 2498 CHECK(!Runtime::Current()->IsCompiler()); 2499 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2500 } 2501 2502 // Verify super class. 2503 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 2504 if (super.get() != NULL) { 2505 // Acquire lock to prevent races on verifying the super class. 2506 ObjectLock<mirror::Class> lock(self, &super); 2507 2508 if (!super->IsVerified() && !super->IsErroneous()) { 2509 VerifyClass(super); 2510 } 2511 if (!super->IsCompileTimeVerified()) { 2512 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2513 PrettyDescriptor(klass.get()).c_str(), 2514 PrettyDescriptor(super.get()).c_str())); 2515 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2516 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 2517 if (cause.get() != nullptr) { 2518 self->ClearException(); 2519 } 2520 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2521 if (cause.get() != nullptr) { 2522 self->GetException(nullptr)->SetCause(cause.get()); 2523 } 2524 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2525 if (Runtime::Current()->IsCompiler()) { 2526 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2527 } 2528 klass->SetStatus(mirror::Class::kStatusError, self); 2529 return; 2530 } 2531 } 2532 2533 // Try to use verification information from the oat file, otherwise do runtime verification. 2534 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2535 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2536 bool preverified = VerifyClassUsingOatFile(dex_file, klass.get(), oat_file_class_status); 2537 if (oat_file_class_status == mirror::Class::kStatusError) { 2538 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2539 << PrettyDescriptor(klass.get()) << " in " 2540 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2541 ThrowVerifyError(klass.get(), "Rejecting class %s because it failed compile-time verification", 2542 PrettyDescriptor(klass.get()).c_str()); 2543 klass->SetStatus(mirror::Class::kStatusError, self); 2544 return; 2545 } 2546 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2547 std::string error_msg; 2548 if (!preverified) { 2549 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.get(), 2550 Runtime::Current()->IsCompiler(), 2551 &error_msg); 2552 } 2553 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2554 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2555 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.get()) 2556 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2557 << " because: " << error_msg; 2558 } 2559 self->AssertNoPendingException(); 2560 // Make sure all classes referenced by catch blocks are resolved. 2561 ResolveClassExceptionHandlerTypes(dex_file, klass); 2562 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2563 // Even though there were no verifier failures we need to respect whether the super-class 2564 // was verified or requiring runtime reverification. 2565 if (super.get() == NULL || super->IsVerified()) { 2566 klass->SetStatus(mirror::Class::kStatusVerified, self); 2567 } else { 2568 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2569 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2570 // Pretend a soft failure occured so that we don't consider the class verified below. 2571 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2572 } 2573 } else { 2574 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2575 // Soft failures at compile time should be retried at runtime. Soft 2576 // failures at runtime will be handled by slow paths in the generated 2577 // code. Set status accordingly. 2578 if (Runtime::Current()->IsCompiler()) { 2579 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2580 } else { 2581 klass->SetStatus(mirror::Class::kStatusVerified, self); 2582 } 2583 } 2584 } else { 2585 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.get()) 2586 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2587 << " because: " << error_msg; 2588 self->AssertNoPendingException(); 2589 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2590 klass->SetStatus(mirror::Class::kStatusError, self); 2591 } 2592 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2593 // Class is verified so we don't need to do any access check on its methods. 2594 // Let the interpreter know it by setting the kAccPreverified flag onto each 2595 // method. 2596 // Note: we're going here during compilation and at runtime. When we set the 2597 // kAccPreverified flag when compiling image classes, the flag is recorded 2598 // in the image and is set when loading the image. 2599 klass->SetPreverifiedFlagOnAllMethods(); 2600 } 2601} 2602 2603bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2604 mirror::Class::Status& oat_file_class_status) { 2605 // If we're compiling, we can only verify the class using the oat file if 2606 // we are not compiling the image or if the class we're verifying is not part of 2607 // the app. In other words, we will only check for preverification of bootclasspath 2608 // classes. 2609 if (Runtime::Current()->IsCompiler()) { 2610 // Are we compiling the bootclasspath? 2611 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2612 return false; 2613 } 2614 // We are compiling an app (not the image). 2615 2616 // Is this an app class? (I.e. not a bootclasspath class) 2617 if (klass->GetClassLoader() != NULL) { 2618 return false; 2619 } 2620 } 2621 2622 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2623 // Make this work with gtests, which do not set up the image properly. 2624 // TODO: we should clean up gtests to set up the image path properly. 2625 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2626 return false; 2627 } 2628 2629 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2630 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2631 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2632 &dex_location_checksum); 2633 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2634 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2635 UniquePtr<const OatFile::OatClass> oat_class(oat_dex_file->GetOatClass(class_def_index)); 2636 CHECK(oat_class.get() != NULL) 2637 << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2638 << ClassHelper(klass).GetDescriptor(); 2639 oat_file_class_status = oat_class->GetStatus(); 2640 if (oat_file_class_status == mirror::Class::kStatusVerified || 2641 oat_file_class_status == mirror::Class::kStatusInitialized) { 2642 return true; 2643 } 2644 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2645 // Compile time verification failed with a soft error. Compile time verification can fail 2646 // because we have incomplete type information. Consider the following: 2647 // class ... { 2648 // Foo x; 2649 // .... () { 2650 // if (...) { 2651 // v1 gets assigned a type of resolved class Foo 2652 // } else { 2653 // v1 gets assigned a type of unresolved class Bar 2654 // } 2655 // iput x = v1 2656 // } } 2657 // when we merge v1 following the if-the-else it results in Conflict 2658 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2659 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2660 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2661 // at compile time). 2662 return false; 2663 } 2664 if (oat_file_class_status == mirror::Class::kStatusError) { 2665 // Compile time verification failed with a hard error. This is caused by invalid instructions 2666 // in the class. These errors are unrecoverable. 2667 return false; 2668 } 2669 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2670 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2671 // not loading the class. 2672 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2673 // isn't a problem and this case shouldn't occur 2674 return false; 2675 } 2676 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2677 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2678 << ClassHelper(klass).GetDescriptor(); 2679 2680 return false; 2681} 2682 2683void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2684 const SirtRef<mirror::Class>& klass) { 2685 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2686 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2687 } 2688 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2689 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2690 } 2691} 2692 2693void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2694 mirror::ArtMethod* method) { 2695 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2696 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2697 if (code_item == NULL) { 2698 return; // native or abstract method 2699 } 2700 if (code_item->tries_size_ == 0) { 2701 return; // nothing to process 2702 } 2703 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2704 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2705 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2706 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2707 CatchHandlerIterator iterator(handlers_ptr); 2708 for (; iterator.HasNext(); iterator.Next()) { 2709 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2710 // unresolved exception types will be ignored by exception delivery 2711 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2712 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2713 if (exception_type == NULL) { 2714 DCHECK(Thread::Current()->IsExceptionPending()); 2715 Thread::Current()->ClearException(); 2716 } 2717 } 2718 } 2719 handlers_ptr = iterator.EndDataPointer(); 2720 } 2721} 2722 2723static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2724static void CheckProxyMethod(mirror::ArtMethod* method, 2725 SirtRef<mirror::ArtMethod>& prototype); 2726 2727mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccess& soa, jstring name, 2728 jobjectArray interfaces, jobject loader, 2729 jobjectArray methods, jobjectArray throws) { 2730 Thread* self = soa.Self(); 2731 SirtRef<mirror::Class> klass(self, AllocClass(self, GetClassRoot(kJavaLangClass), 2732 sizeof(mirror::SynthesizedProxyClass))); 2733 if (klass.get() == NULL) { 2734 CHECK(self->IsExceptionPending()); // OOME. 2735 return NULL; 2736 } 2737 DCHECK(klass->GetClass() != NULL); 2738 klass->SetObjectSize(sizeof(mirror::Proxy)); 2739 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2740 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2741 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2742 klass->SetName(soa.Decode<mirror::String*>(name)); 2743 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2744 klass->SetDexCache(proxy_class->GetDexCache()); 2745 klass->SetStatus(mirror::Class::kStatusIdx, self); 2746 2747 // Instance fields are inherited, but we add a couple of static fields... 2748 { 2749 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2750 if (UNLIKELY(sfields == NULL)) { 2751 CHECK(self->IsExceptionPending()); // OOME. 2752 return NULL; 2753 } 2754 klass->SetSFields(sfields); 2755 } 2756 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2757 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2758 SirtRef<mirror::ArtField> interfaces_sfield(self, AllocArtField(self)); 2759 if (UNLIKELY(interfaces_sfield.get() == NULL)) { 2760 CHECK(self->IsExceptionPending()); // OOME. 2761 return NULL; 2762 } 2763 klass->SetStaticField(0, interfaces_sfield.get()); 2764 interfaces_sfield->SetDexFieldIndex(0); 2765 interfaces_sfield->SetDeclaringClass(klass.get()); 2766 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2767 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2768 SirtRef<mirror::ArtField> throws_sfield(self, AllocArtField(self)); 2769 if (UNLIKELY(throws_sfield.get() == NULL)) { 2770 CHECK(self->IsExceptionPending()); // OOME. 2771 return NULL; 2772 } 2773 klass->SetStaticField(1, throws_sfield.get()); 2774 throws_sfield->SetDexFieldIndex(1); 2775 throws_sfield->SetDeclaringClass(klass.get()); 2776 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2777 2778 // Proxies have 1 direct method, the constructor 2779 { 2780 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 2781 if (UNLIKELY(directs == NULL)) { 2782 CHECK(self->IsExceptionPending()); // OOME. 2783 return NULL; 2784 } 2785 klass->SetDirectMethods(directs); 2786 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2787 if (UNLIKELY(constructor == NULL)) { 2788 CHECK(self->IsExceptionPending()); // OOME. 2789 return NULL; 2790 } 2791 klass->SetDirectMethod(0, constructor); 2792 } 2793 2794 // Create virtual method using specified prototypes. 2795 size_t num_virtual_methods = 2796 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 2797 { 2798 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, num_virtual_methods); 2799 if (UNLIKELY(virtuals == NULL)) { 2800 CHECK(self->IsExceptionPending()); // OOME. 2801 return NULL; 2802 } 2803 klass->SetVirtualMethods(virtuals); 2804 } 2805 for (size_t i = 0; i < num_virtual_methods; ++i) { 2806 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2807 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2808 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2809 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2810 if (UNLIKELY(clone == NULL)) { 2811 CHECK(self->IsExceptionPending()); // OOME. 2812 return NULL; 2813 } 2814 klass->SetVirtualMethod(i, clone); 2815 } 2816 2817 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2818 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Class is now effectively in the loaded state 2819 self->AssertNoPendingException(); 2820 2821 { 2822 ObjectLock<mirror::Class> lock(self, &klass); // Must hold lock on object when resolved. 2823 // Link the fields and virtual methods, creating vtable and iftables 2824 SirtRef<mirror::ObjectArray<mirror::Class> > sirt_interfaces( 2825 self, soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2826 if (!LinkClass(self, klass, sirt_interfaces)) { 2827 klass->SetStatus(mirror::Class::kStatusError, self); 2828 return nullptr; 2829 } 2830 2831 interfaces_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2832 throws_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2833 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2834 } 2835 2836 // sanity checks 2837 if (kIsDebugBuild) { 2838 CHECK(klass->GetIFields() == NULL); 2839 CheckProxyConstructor(klass->GetDirectMethod(0)); 2840 for (size_t i = 0; i < num_virtual_methods; ++i) { 2841 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2842 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2843 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2844 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2845 } 2846 2847 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 2848 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2849 decoded_name->ToModifiedUtf8().c_str())); 2850 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2851 2852 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2853 decoded_name->ToModifiedUtf8().c_str())); 2854 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2855 2856 mirror::SynthesizedProxyClass* synth_proxy_class = 2857 down_cast<mirror::SynthesizedProxyClass*>(klass.get()); 2858 CHECK_EQ(synth_proxy_class->GetInterfaces(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2859 CHECK_EQ(synth_proxy_class->GetThrows(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2860 } 2861 std::string descriptor(GetDescriptorForProxy(klass.get())); 2862 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.get(), Hash(descriptor.c_str())); 2863 CHECK(existing == nullptr); 2864 return klass.get(); 2865} 2866 2867std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 2868 DCHECK(proxy_class->IsProxyClass()); 2869 mirror::String* name = proxy_class->GetName(); 2870 DCHECK(name != NULL); 2871 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2872} 2873 2874mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 2875 mirror::ArtMethod* proxy_method) { 2876 DCHECK(proxy_class->IsProxyClass()); 2877 DCHECK(proxy_method->IsProxyMethod()); 2878 // Locate the dex cache of the original interface/Object 2879 mirror::DexCache* dex_cache = NULL; 2880 { 2881 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2882 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2883 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2884 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2885 dex_cache = dex_caches_[i]; 2886 break; 2887 } 2888 } 2889 } 2890 CHECK(dex_cache != NULL); 2891 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2892 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2893 CHECK(resolved_method != NULL); 2894 return resolved_method; 2895} 2896 2897 2898mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2899 const SirtRef<mirror::Class>& klass, 2900 mirror::Class* proxy_class) { 2901 // Create constructor for Proxy that must initialize h 2902 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2903 proxy_class->GetDirectMethods(); 2904 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2905 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2906 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2907 // code_ too) 2908 mirror::ArtMethod* constructor = 2909 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2910 if (constructor == NULL) { 2911 CHECK(self->IsExceptionPending()); // OOME. 2912 return NULL; 2913 } 2914 // Make this constructor public and fix the class to be our Proxy version 2915 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2916 constructor->SetDeclaringClass(klass.get()); 2917 return constructor; 2918} 2919 2920static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2921 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2922 CHECK(constructor->IsConstructor()); 2923 MethodHelper mh(constructor); 2924 CHECK_STREQ(mh.GetName(), "<init>"); 2925 CHECK_STREQ(mh.GetSignature().ToString().c_str(), "(Ljava/lang/reflect/InvocationHandler;)V"); 2926 DCHECK(constructor->IsPublic()); 2927} 2928 2929mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 2930 const SirtRef<mirror::Class>& klass, 2931 const SirtRef<mirror::ArtMethod>& prototype) { 2932 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2933 // prototype method 2934 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2935 prototype.get()); 2936 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2937 // as necessary 2938 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 2939 if (UNLIKELY(method == NULL)) { 2940 CHECK(self->IsExceptionPending()); // OOME. 2941 return NULL; 2942 } 2943 2944 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 2945 // the intersection of throw exceptions as defined in Proxy 2946 method->SetDeclaringClass(klass.get()); 2947 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 2948 2949 // At runtime the method looks like a reference and argument saving method, clone the code 2950 // related parameters from this method. 2951 mirror::ArtMethod* refs_and_args = 2952 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 2953 method->SetCoreSpillMask(refs_and_args->GetCoreSpillMask()); 2954 method->SetFpSpillMask(refs_and_args->GetFpSpillMask()); 2955 method->SetFrameSizeInBytes(refs_and_args->GetFrameSizeInBytes()); 2956 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 2957 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 2958 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2959 2960 return method; 2961} 2962 2963static void CheckProxyMethod(mirror::ArtMethod* method, 2964 SirtRef<mirror::ArtMethod>& prototype) 2965 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2966 // Basic sanity 2967 CHECK(!prototype->IsFinal()); 2968 CHECK(method->IsFinal()); 2969 CHECK(!method->IsAbstract()); 2970 2971 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 2972 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 2973 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 2974 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 2975 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 2976 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 2977 2978 MethodHelper mh(method); 2979 MethodHelper mh2(prototype.get()); 2980 CHECK_STREQ(mh.GetName(), mh2.GetName()); 2981 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 2982 // More complex sanity - via dex cache 2983 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 2984} 2985 2986static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 2987 bool can_init_parents) 2988 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2989 if (can_init_statics && can_init_parents) { 2990 return true; 2991 } 2992 if (!can_init_statics) { 2993 // Check if there's a class initializer. 2994 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 2995 if (clinit != NULL) { 2996 return false; 2997 } 2998 // Check if there are encoded static values needing initialization. 2999 if (klass->NumStaticFields() != 0) { 3000 ClassHelper kh(klass); 3001 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3002 DCHECK(dex_class_def != NULL); 3003 if (dex_class_def->static_values_off_ != 0) { 3004 return false; 3005 } 3006 } 3007 } 3008 if (!klass->IsInterface() && klass->HasSuperClass()) { 3009 mirror::Class* super_class = klass->GetSuperClass(); 3010 if (!can_init_parents && !super_class->IsInitialized()) { 3011 return false; 3012 } else { 3013 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3014 return false; 3015 } 3016 } 3017 } 3018 return true; 3019} 3020 3021bool ClassLinker::IsInitialized() const { 3022 return init_done_; 3023} 3024 3025bool ClassLinker::InitializeClass(const SirtRef<mirror::Class>& klass, bool can_init_statics, 3026 bool can_init_parents) { 3027 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3028 3029 // Are we already initialized and therefore done? 3030 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3031 // an initialized class will never change its state. 3032 if (klass->IsInitialized()) { 3033 return true; 3034 } 3035 3036 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3037 if (!CanWeInitializeClass(klass.get(), can_init_statics, can_init_parents)) { 3038 return false; 3039 } 3040 3041 Thread* self = Thread::Current(); 3042 uint64_t t0; 3043 { 3044 ObjectLock<mirror::Class> lock(self, &klass); 3045 3046 // Re-check under the lock in case another thread initialized ahead of us. 3047 if (klass->IsInitialized()) { 3048 return true; 3049 } 3050 3051 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3052 if (klass->IsErroneous()) { 3053 ThrowEarlierClassFailure(klass.get()); 3054 return false; 3055 } 3056 3057 CHECK(klass->IsResolved()) << PrettyClass(klass.get()) << ": state=" << klass->GetStatus(); 3058 3059 if (!klass->IsVerified()) { 3060 VerifyClass(klass); 3061 if (!klass->IsVerified()) { 3062 // We failed to verify, expect either the klass to be erroneous or verification failed at 3063 // compile time. 3064 if (klass->IsErroneous()) { 3065 CHECK(self->IsExceptionPending()); 3066 } else { 3067 CHECK(Runtime::Current()->IsCompiler()); 3068 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3069 } 3070 return false; 3071 } 3072 } 3073 3074 // If the class is kStatusInitializing, either this thread is 3075 // initializing higher up the stack or another thread has beat us 3076 // to initializing and we need to wait. Either way, this 3077 // invocation of InitializeClass will not be responsible for 3078 // running <clinit> and will return. 3079 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3080 // We caught somebody else in the act; was it us? 3081 if (klass->GetClinitThreadId() == self->GetTid()) { 3082 // Yes. That's fine. Return so we can continue initializing. 3083 return true; 3084 } 3085 // No. That's fine. Wait for another thread to finish initializing. 3086 return WaitForInitializeClass(klass, self, lock); 3087 } 3088 3089 if (!ValidateSuperClassDescriptors(klass)) { 3090 klass->SetStatus(mirror::Class::kStatusError, self); 3091 return false; 3092 } 3093 3094 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.get()); 3095 3096 // From here out other threads may observe that we're initializing and so changes of state 3097 // require the a notification. 3098 klass->SetClinitThreadId(self->GetTid()); 3099 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3100 3101 t0 = NanoTime(); 3102 } 3103 3104 // Initialize super classes, must be done while initializing for the JLS. 3105 if (!klass->IsInterface() && klass->HasSuperClass()) { 3106 mirror::Class* super_class = klass->GetSuperClass(); 3107 if (!super_class->IsInitialized()) { 3108 CHECK(!super_class->IsInterface()); 3109 CHECK(can_init_parents); 3110 SirtRef<mirror::Class> sirt_super(self, super_class); 3111 bool super_initialized = InitializeClass(sirt_super, can_init_statics, true); 3112 if (!super_initialized) { 3113 // The super class was verified ahead of entering initializing, we should only be here if 3114 // the super class became erroneous due to initialization. 3115 CHECK(sirt_super->IsErroneous() && self->IsExceptionPending()) 3116 << "Super class initialization failed for " << PrettyDescriptor(sirt_super.get()) 3117 << " that has unexpected status " << sirt_super->GetStatus() 3118 << "\nPending exception:\n" 3119 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3120 ObjectLock<mirror::Class> lock(self, &klass); 3121 // Initialization failed because the super-class is erroneous. 3122 klass->SetStatus(mirror::Class::kStatusError, self); 3123 return false; 3124 } 3125 } 3126 } 3127 3128 if (klass->NumStaticFields() > 0) { 3129 ClassHelper kh(klass.get()); 3130 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3131 CHECK(dex_class_def != NULL); 3132 const DexFile& dex_file = kh.GetDexFile(); 3133 SirtRef<mirror::ClassLoader> class_loader(self, klass->GetClassLoader()); 3134 SirtRef<mirror::DexCache> dex_cache(self, kh.GetDexCache()); 3135 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3136 this, *dex_class_def); 3137 if (it.HasNext()) { 3138 CHECK(can_init_statics); 3139 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 3140 SafeMap<uint32_t, mirror::ArtField*> field_map; 3141 ConstructFieldMap(dex_file, *dex_class_def, klass.get(), field_map); 3142 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3143 if (Runtime::Current()->IsActiveTransaction()) { 3144 it.ReadValueToField<true>(field_map.Get(i)); 3145 } else { 3146 it.ReadValueToField<false>(field_map.Get(i)); 3147 } 3148 } 3149 } 3150 } 3151 3152 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3153 if (clinit != NULL) { 3154 CHECK(can_init_statics); 3155 if (LIKELY(Runtime::Current()->IsStarted())) { 3156 JValue result; 3157 clinit->Invoke(self, NULL, 0, &result, "V"); 3158 } else { 3159 art::interpreter::EnterInterpreterFromInvoke(self, clinit, NULL, NULL, NULL); 3160 } 3161 } 3162 3163 uint64_t t1 = NanoTime(); 3164 3165 bool success = true; 3166 { 3167 ObjectLock<mirror::Class> lock(self, &klass); 3168 3169 if (self->IsExceptionPending()) { 3170 WrapExceptionInInitializer(); 3171 klass->SetStatus(mirror::Class::kStatusError, self); 3172 success = false; 3173 } else { 3174 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3175 RuntimeStats* thread_stats = self->GetStats(); 3176 ++global_stats->class_init_count; 3177 ++thread_stats->class_init_count; 3178 global_stats->class_init_time_ns += (t1 - t0); 3179 thread_stats->class_init_time_ns += (t1 - t0); 3180 // Set the class as initialized except if failed to initialize static fields. 3181 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3182 if (VLOG_IS_ON(class_linker)) { 3183 ClassHelper kh(klass.get()); 3184 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 3185 } 3186 // Opportunistically set static method trampolines to their destination. 3187 FixupStaticTrampolines(klass.get()); 3188 } 3189 } 3190 return success; 3191} 3192 3193bool ClassLinker::WaitForInitializeClass(const SirtRef<mirror::Class>& klass, Thread* self, 3194 ObjectLock<mirror::Class>& lock) 3195 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3196 while (true) { 3197 self->AssertNoPendingException(); 3198 CHECK(!klass->IsInitialized()); 3199 lock.WaitIgnoringInterrupts(); 3200 3201 // When we wake up, repeat the test for init-in-progress. If 3202 // there's an exception pending (only possible if 3203 // "interruptShouldThrow" was set), bail out. 3204 if (self->IsExceptionPending()) { 3205 WrapExceptionInInitializer(); 3206 klass->SetStatus(mirror::Class::kStatusError, self); 3207 return false; 3208 } 3209 // Spurious wakeup? Go back to waiting. 3210 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3211 continue; 3212 } 3213 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3214 // Compile time initialization failed. 3215 return false; 3216 } 3217 if (klass->IsErroneous()) { 3218 // The caller wants an exception, but it was thrown in a 3219 // different thread. Synthesize one here. 3220 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3221 PrettyDescriptor(klass.get()).c_str()); 3222 return false; 3223 } 3224 if (klass->IsInitialized()) { 3225 return true; 3226 } 3227 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.get()) << " is " 3228 << klass->GetStatus(); 3229 } 3230 LOG(FATAL) << "Not Reached" << PrettyClass(klass.get()); 3231} 3232 3233bool ClassLinker::ValidateSuperClassDescriptors(const SirtRef<mirror::Class>& klass) { 3234 if (klass->IsInterface()) { 3235 return true; 3236 } 3237 Thread* self = Thread::Current(); 3238 // begin with the methods local to the superclass 3239 if (klass->HasSuperClass() && 3240 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3241 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 3242 for (int i = super->GetVTable()->GetLength() - 1; i >= 0; --i) { 3243 mirror::ArtMethod* method = klass->GetVTable()->Get(i); 3244 if (method != super->GetVTable()->Get(i) && 3245 !IsSameMethodSignatureInDifferentClassContexts(self, method, super.get(), klass.get())) { 3246 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in superclass %s", 3247 PrettyDescriptor(klass.get()).c_str(), PrettyMethod(method).c_str(), 3248 PrettyDescriptor(super.get()).c_str()); 3249 return false; 3250 } 3251 } 3252 } 3253 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3254 SirtRef<mirror::Class> interface(self, klass->GetIfTable()->GetInterface(i)); 3255 if (klass->GetClassLoader() != interface->GetClassLoader()) { 3256 for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { 3257 mirror::ArtMethod* method = klass->GetIfTable()->GetMethodArray(i)->Get(j); 3258 if (!IsSameMethodSignatureInDifferentClassContexts(self, method, interface.get(), 3259 method->GetDeclaringClass())) { 3260 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in interface %s", 3261 PrettyDescriptor(method->GetDeclaringClass()).c_str(), 3262 PrettyMethod(method).c_str(), 3263 PrettyDescriptor(interface.get()).c_str()); 3264 return false; 3265 } 3266 } 3267 } 3268 } 3269 return true; 3270} 3271 3272// Returns true if classes referenced by the signature of the method are the 3273// same classes in klass1 as they are in klass2. 3274bool ClassLinker::IsSameMethodSignatureInDifferentClassContexts(Thread* self, 3275 mirror::ArtMethod* method, 3276 mirror::Class* klass1, 3277 mirror::Class* klass2) { 3278 if (klass1 == klass2) { 3279 return true; 3280 } 3281 CHECK(klass1 != nullptr); 3282 CHECK(klass2 != nullptr); 3283 SirtRef<mirror::ClassLoader> loader1(self, klass1->GetClassLoader()); 3284 SirtRef<mirror::ClassLoader> loader2(self, klass2->GetClassLoader()); 3285 const DexFile& dex_file = *method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 3286 const DexFile::ProtoId& proto_id = 3287 dex_file.GetMethodPrototype(dex_file.GetMethodId(method->GetDexMethodIndex())); 3288 for (DexFileParameterIterator it(dex_file, proto_id); it.HasNext(); it.Next()) { 3289 const char* descriptor = it.GetDescriptor(); 3290 if (descriptor == nullptr) { 3291 break; 3292 } 3293 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3294 // Found a non-primitive type. 3295 if (!IsSameDescriptorInDifferentClassContexts(self, descriptor, loader1, loader2)) { 3296 return false; 3297 } 3298 } 3299 } 3300 // Check the return type 3301 const char* descriptor = dex_file.GetReturnTypeDescriptor(proto_id); 3302 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3303 if (!IsSameDescriptorInDifferentClassContexts(self, descriptor, loader1, loader2)) { 3304 return false; 3305 } 3306 } 3307 return true; 3308} 3309 3310// Returns true if the descriptor resolves to the same class in the context of loader1 and loader2. 3311bool ClassLinker::IsSameDescriptorInDifferentClassContexts(Thread* self, const char* descriptor, 3312 SirtRef<mirror::ClassLoader>& loader1, 3313 SirtRef<mirror::ClassLoader>& loader2) { 3314 CHECK(descriptor != nullptr); 3315 SirtRef<mirror::Class> found1(self, FindClass(self, descriptor, loader1)); 3316 if (found1.get() == nullptr) { 3317 self->ClearException(); 3318 } 3319 mirror::Class* found2 = FindClass(self, descriptor, loader2); 3320 if (found2 == nullptr) { 3321 self->ClearException(); 3322 } 3323 return found1.get() == found2; 3324} 3325 3326bool ClassLinker::EnsureInitialized(const SirtRef<mirror::Class>& c, bool can_init_fields, 3327 bool can_init_parents) { 3328 DCHECK(c.get() != NULL); 3329 if (c->IsInitialized()) { 3330 return true; 3331 } 3332 3333 bool success = InitializeClass(c, can_init_fields, can_init_parents); 3334 if (!success) { 3335 if (can_init_fields && can_init_parents) { 3336 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.get()); 3337 } 3338 } 3339 return success; 3340} 3341 3342void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3343 mirror::Class* c, 3344 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3345 const byte* class_data = dex_file.GetClassData(dex_class_def); 3346 ClassDataItemIterator it(dex_file, class_data); 3347 Thread* self = Thread::Current(); 3348 SirtRef<mirror::DexCache> dex_cache(self, c->GetDexCache()); 3349 SirtRef<mirror::ClassLoader> class_loader(self, c->GetClassLoader()); 3350 CHECK(!kMovingFields); 3351 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3352 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3353 } 3354} 3355 3356bool ClassLinker::LinkClass(Thread* self, const SirtRef<mirror::Class>& klass, 3357 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3358 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3359 if (!LinkSuperClass(klass)) { 3360 return false; 3361 } 3362 if (!LinkMethods(klass, interfaces)) { 3363 return false; 3364 } 3365 if (!LinkInstanceFields(klass)) { 3366 return false; 3367 } 3368 if (!LinkStaticFields(klass)) { 3369 return false; 3370 } 3371 CreateReferenceInstanceOffsets(klass); 3372 CreateReferenceStaticOffsets(klass); 3373 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3374 klass->SetStatus(mirror::Class::kStatusResolved, self); 3375 return true; 3376} 3377 3378bool ClassLinker::LoadSuperAndInterfaces(const SirtRef<mirror::Class>& klass, 3379 const DexFile& dex_file) { 3380 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3381 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3382 uint16_t super_class_idx = class_def.superclass_idx_; 3383 if (super_class_idx != DexFile::kDexNoIndex16) { 3384 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.get()); 3385 if (super_class == NULL) { 3386 DCHECK(Thread::Current()->IsExceptionPending()); 3387 return false; 3388 } 3389 // Verify 3390 if (!klass->CanAccess(super_class)) { 3391 ThrowIllegalAccessError(klass.get(), "Class %s extended by class %s is inaccessible", 3392 PrettyDescriptor(super_class).c_str(), 3393 PrettyDescriptor(klass.get()).c_str()); 3394 return false; 3395 } 3396 klass->SetSuperClass(super_class); 3397 } 3398 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3399 if (interfaces != NULL) { 3400 for (size_t i = 0; i < interfaces->Size(); i++) { 3401 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3402 mirror::Class* interface = ResolveType(dex_file, idx, klass.get()); 3403 if (interface == NULL) { 3404 DCHECK(Thread::Current()->IsExceptionPending()); 3405 return false; 3406 } 3407 // Verify 3408 if (!klass->CanAccess(interface)) { 3409 // TODO: the RI seemed to ignore this in my testing. 3410 ThrowIllegalAccessError(klass.get(), "Interface %s implemented by class %s is inaccessible", 3411 PrettyDescriptor(interface).c_str(), 3412 PrettyDescriptor(klass.get()).c_str()); 3413 return false; 3414 } 3415 } 3416 } 3417 // Mark the class as loaded. 3418 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3419 return true; 3420} 3421 3422bool ClassLinker::LinkSuperClass(const SirtRef<mirror::Class>& klass) { 3423 CHECK(!klass->IsPrimitive()); 3424 mirror::Class* super = klass->GetSuperClass(); 3425 if (klass.get() == GetClassRoot(kJavaLangObject)) { 3426 if (super != NULL) { 3427 ThrowClassFormatError(klass.get(), "java.lang.Object must not have a superclass"); 3428 return false; 3429 } 3430 return true; 3431 } 3432 if (super == NULL) { 3433 ThrowLinkageError(klass.get(), "No superclass defined for class %s", 3434 PrettyDescriptor(klass.get()).c_str()); 3435 return false; 3436 } 3437 // Verify 3438 if (super->IsFinal() || super->IsInterface()) { 3439 ThrowIncompatibleClassChangeError(klass.get(), "Superclass %s of %s is %s", 3440 PrettyDescriptor(super).c_str(), 3441 PrettyDescriptor(klass.get()).c_str(), 3442 super->IsFinal() ? "declared final" : "an interface"); 3443 return false; 3444 } 3445 if (!klass->CanAccess(super)) { 3446 ThrowIllegalAccessError(klass.get(), "Superclass %s is inaccessible to class %s", 3447 PrettyDescriptor(super).c_str(), 3448 PrettyDescriptor(klass.get()).c_str()); 3449 return false; 3450 } 3451 3452 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3453 if (super->IsFinalizable()) { 3454 klass->SetFinalizable(); 3455 } 3456 3457 // Inherit reference flags (if any) from the superclass. 3458 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3459 if (reference_flags != 0) { 3460 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3461 } 3462 // Disallow custom direct subclasses of java.lang.ref.Reference. 3463 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3464 ThrowLinkageError(klass.get(), 3465 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3466 PrettyDescriptor(klass.get()).c_str()); 3467 return false; 3468 } 3469 3470 if (kIsDebugBuild) { 3471 // Ensure super classes are fully resolved prior to resolving fields.. 3472 while (super != NULL) { 3473 CHECK(super->IsResolved()); 3474 super = super->GetSuperClass(); 3475 } 3476 } 3477 return true; 3478} 3479 3480// Populate the class vtable and itable. Compute return type indices. 3481bool ClassLinker::LinkMethods(const SirtRef<mirror::Class>& klass, 3482 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3483 if (klass->IsInterface()) { 3484 // No vtable. 3485 size_t count = klass->NumVirtualMethods(); 3486 if (!IsUint(16, count)) { 3487 ThrowClassFormatError(klass.get(), "Too many methods on interface: %zd", count); 3488 return false; 3489 } 3490 for (size_t i = 0; i < count; ++i) { 3491 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3492 } 3493 // Link interface method tables 3494 return LinkInterfaceMethods(klass, interfaces); 3495 } else { 3496 // Link virtual and interface method tables 3497 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3498 } 3499 return true; 3500} 3501 3502bool ClassLinker::LinkVirtualMethods(const SirtRef<mirror::Class>& klass) { 3503 Thread* self = Thread::Current(); 3504 if (klass->HasSuperClass()) { 3505 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3506 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3507 CHECK_LE(actual_count, max_count); 3508 // TODO: do not assign to the vtable field until it is fully constructed. 3509 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3510 vtable(self, klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count)); 3511 if (UNLIKELY(vtable.get() == NULL)) { 3512 CHECK(self->IsExceptionPending()); // OOME. 3513 return false; 3514 } 3515 // See if any of our virtual methods override the superclass. 3516 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3517 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3518 MethodHelper local_mh(local_method); 3519 size_t j = 0; 3520 for (; j < actual_count; ++j) { 3521 mirror::ArtMethod* super_method = vtable->Get(j); 3522 MethodHelper super_mh(super_method); 3523 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3524 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3525 if (super_method->IsFinal()) { 3526 ThrowLinkageError(klass.get(), "Method %s overrides final method in class %s", 3527 PrettyMethod(local_method).c_str(), 3528 super_mh.GetDeclaringClassDescriptor()); 3529 return false; 3530 } 3531 vtable->Set<false>(j, local_method); 3532 local_method->SetMethodIndex(j); 3533 break; 3534 } else { 3535 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3536 << " would have incorrectly overridden the package-private method in " 3537 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3538 } 3539 } 3540 } 3541 if (j == actual_count) { 3542 // Not overriding, append. 3543 vtable->Set<false>(actual_count, local_method); 3544 local_method->SetMethodIndex(actual_count); 3545 actual_count += 1; 3546 } 3547 } 3548 if (!IsUint(16, actual_count)) { 3549 ThrowClassFormatError(klass.get(), "Too many methods defined on class: %zd", actual_count); 3550 return false; 3551 } 3552 // Shrink vtable if possible 3553 CHECK_LE(actual_count, max_count); 3554 if (actual_count < max_count) { 3555 vtable.reset(vtable->CopyOf(self, actual_count)); 3556 if (UNLIKELY(vtable.get() == NULL)) { 3557 CHECK(self->IsExceptionPending()); // OOME. 3558 return false; 3559 } 3560 } 3561 klass->SetVTable(vtable.get()); 3562 } else { 3563 CHECK(klass.get() == GetClassRoot(kJavaLangObject)); 3564 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3565 if (!IsUint(16, num_virtual_methods)) { 3566 ThrowClassFormatError(klass.get(), "Too many methods: %d", num_virtual_methods); 3567 return false; 3568 } 3569 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3570 vtable(self, AllocArtMethodArray(self, num_virtual_methods)); 3571 if (UNLIKELY(vtable.get() == NULL)) { 3572 CHECK(self->IsExceptionPending()); // OOME. 3573 return false; 3574 } 3575 for (size_t i = 0; i < num_virtual_methods; ++i) { 3576 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3577 vtable->Set<false>(i, virtual_method); 3578 virtual_method->SetMethodIndex(i & 0xFFFF); 3579 } 3580 klass->SetVTable(vtable.get()); 3581 } 3582 return true; 3583} 3584 3585bool ClassLinker::LinkInterfaceMethods(const SirtRef<mirror::Class>& klass, 3586 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3587 // Set the imt table to be all conflicts by default. 3588 klass->SetImTable(Runtime::Current()->GetDefaultImt()); 3589 size_t super_ifcount; 3590 if (klass->HasSuperClass()) { 3591 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3592 } else { 3593 super_ifcount = 0; 3594 } 3595 size_t ifcount = super_ifcount; 3596 uint32_t num_interfaces; 3597 { 3598 ClassHelper kh(klass.get()); 3599 num_interfaces = 3600 interfaces.get() == nullptr ? kh.NumDirectInterfaces() : interfaces->GetLength(); 3601 ifcount += num_interfaces; 3602 for (size_t i = 0; i < num_interfaces; i++) { 3603 mirror::Class* interface = 3604 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3605 ifcount += interface->GetIfTableCount(); 3606 } 3607 } 3608 if (ifcount == 0) { 3609 // Class implements no interfaces. 3610 DCHECK_EQ(klass->GetIfTableCount(), 0); 3611 DCHECK(klass->GetIfTable() == NULL); 3612 return true; 3613 } 3614 if (ifcount == super_ifcount) { 3615 // Class implements same interfaces as parent, are any of these not marker interfaces? 3616 bool has_non_marker_interface = false; 3617 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3618 for (size_t i = 0; i < ifcount; ++i) { 3619 if (super_iftable->GetMethodArrayCount(i) > 0) { 3620 has_non_marker_interface = true; 3621 break; 3622 } 3623 } 3624 if (!has_non_marker_interface) { 3625 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3626 klass->SetIfTable(super_iftable); 3627 return true; 3628 } 3629 } 3630 Thread* self = Thread::Current(); 3631 SirtRef<mirror::IfTable> iftable(self, AllocIfTable(self, ifcount)); 3632 if (UNLIKELY(iftable.get() == NULL)) { 3633 CHECK(self->IsExceptionPending()); // OOME. 3634 return false; 3635 } 3636 if (super_ifcount != 0) { 3637 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3638 for (size_t i = 0; i < super_ifcount; i++) { 3639 mirror::Class* super_interface = super_iftable->GetInterface(i); 3640 iftable->SetInterface(i, super_interface); 3641 } 3642 } 3643 // Flatten the interface inheritance hierarchy. 3644 size_t idx = super_ifcount; 3645 for (size_t i = 0; i < num_interfaces; i++) { 3646 ClassHelper kh(klass.get()); 3647 mirror::Class* interface = 3648 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3649 DCHECK(interface != NULL); 3650 if (!interface->IsInterface()) { 3651 ClassHelper ih(interface); 3652 ThrowIncompatibleClassChangeError(klass.get(), "Class %s implements non-interface class %s", 3653 PrettyDescriptor(klass.get()).c_str(), 3654 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3655 return false; 3656 } 3657 // Check if interface is already in iftable 3658 bool duplicate = false; 3659 for (size_t j = 0; j < idx; j++) { 3660 mirror::Class* existing_interface = iftable->GetInterface(j); 3661 if (existing_interface == interface) { 3662 duplicate = true; 3663 break; 3664 } 3665 } 3666 if (!duplicate) { 3667 // Add this non-duplicate interface. 3668 iftable->SetInterface(idx++, interface); 3669 // Add this interface's non-duplicate super-interfaces. 3670 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3671 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3672 bool super_duplicate = false; 3673 for (size_t k = 0; k < idx; k++) { 3674 mirror::Class* existing_interface = iftable->GetInterface(k); 3675 if (existing_interface == super_interface) { 3676 super_duplicate = true; 3677 break; 3678 } 3679 } 3680 if (!super_duplicate) { 3681 iftable->SetInterface(idx++, super_interface); 3682 } 3683 } 3684 } 3685 } 3686 // Shrink iftable in case duplicates were found 3687 if (idx < ifcount) { 3688 iftable.reset(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3689 if (UNLIKELY(iftable.get() == NULL)) { 3690 CHECK(self->IsExceptionPending()); // OOME. 3691 return false; 3692 } 3693 ifcount = idx; 3694 } else { 3695 CHECK_EQ(idx, ifcount); 3696 } 3697 klass->SetIfTable(iftable.get()); 3698 3699 // If we're an interface, we don't need the vtable pointers, so we're done. 3700 if (klass->IsInterface()) { 3701 return true; 3702 } 3703 // Allocate imtable 3704 bool imtable_changed = false; 3705 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > imtable(self, AllocArtMethodArray(self, kImtSize)); 3706 if (UNLIKELY(imtable.get() == NULL)) { 3707 CHECK(self->IsExceptionPending()); // OOME. 3708 return false; 3709 } 3710 std::vector<mirror::ArtMethod*> miranda_list; 3711 for (size_t i = 0; i < ifcount; ++i) { 3712 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 3713 if (num_methods > 0) { 3714 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3715 method_array(self, AllocArtMethodArray(self, num_methods)); 3716 if (UNLIKELY(method_array.get() == nullptr)) { 3717 CHECK(self->IsExceptionPending()); // OOME. 3718 return false; 3719 } 3720 iftable->SetMethodArray(i, method_array.get()); 3721 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > vtable(self, 3722 klass->GetVTableDuringLinking()); 3723 for (size_t j = 0; j < num_methods; ++j) { 3724 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 3725 MethodHelper interface_mh(interface_method); 3726 int32_t k; 3727 // For each method listed in the interface's method list, find the 3728 // matching method in our class's method list. We want to favor the 3729 // subclass over the superclass, which just requires walking 3730 // back from the end of the vtable. (This only matters if the 3731 // superclass defines a private method and this class redefines 3732 // it -- otherwise it would use the same vtable slot. In .dex files 3733 // those don't end up in the virtual method table, so it shouldn't 3734 // matter which direction we go. We walk it backward anyway.) 3735 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3736 mirror::ArtMethod* vtable_method = vtable->Get(k); 3737 MethodHelper vtable_mh(vtable_method); 3738 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3739 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3740 ThrowIllegalAccessError(klass.get(), 3741 "Method '%s' implementing interface method '%s' is not public", 3742 PrettyMethod(vtable_method).c_str(), 3743 PrettyMethod(interface_method).c_str()); 3744 return false; 3745 } 3746 method_array->Set<false>(j, vtable_method); 3747 // Place method in imt if entry is empty, place conflict otherwise. 3748 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3749 if (imtable->Get(imt_index) == NULL) { 3750 imtable->Set<false>(imt_index, vtable_method); 3751 imtable_changed = true; 3752 } else { 3753 imtable->Set<false>(imt_index, Runtime::Current()->GetImtConflictMethod()); 3754 } 3755 break; 3756 } 3757 } 3758 if (k < 0) { 3759 SirtRef<mirror::ArtMethod> miranda_method(self, NULL); 3760 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3761 mirror::ArtMethod* mir_method = miranda_list[mir]; 3762 MethodHelper vtable_mh(mir_method); 3763 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3764 miranda_method.reset(miranda_list[mir]); 3765 break; 3766 } 3767 } 3768 if (miranda_method.get() == NULL) { 3769 // Point the interface table at a phantom slot. 3770 miranda_method.reset(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3771 if (UNLIKELY(miranda_method.get() == NULL)) { 3772 CHECK(self->IsExceptionPending()); // OOME. 3773 return false; 3774 } 3775 // TODO: If a methods move then the miranda_list may hold stale references. 3776 miranda_list.push_back(miranda_method.get()); 3777 } 3778 method_array->Set<false>(j, miranda_method.get()); 3779 } 3780 } 3781 } 3782 } 3783 if (imtable_changed) { 3784 // Fill in empty entries in interface method table with conflict. 3785 mirror::ArtMethod* imt_conflict_method = Runtime::Current()->GetImtConflictMethod(); 3786 for (size_t i = 0; i < kImtSize; i++) { 3787 if (imtable->Get(i) == NULL) { 3788 imtable->Set<false>(i, imt_conflict_method); 3789 } 3790 } 3791 klass->SetImTable(imtable.get()); 3792 } 3793 if (!miranda_list.empty()) { 3794 int old_method_count = klass->NumVirtualMethods(); 3795 int new_method_count = old_method_count + miranda_list.size(); 3796 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3797 if (old_method_count == 0) { 3798 virtuals = AllocArtMethodArray(self, new_method_count); 3799 } else { 3800 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3801 } 3802 if (UNLIKELY(virtuals == NULL)) { 3803 CHECK(self->IsExceptionPending()); // OOME. 3804 return false; 3805 } 3806 klass->SetVirtualMethods(virtuals); 3807 3808 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3809 vtable(self, klass->GetVTableDuringLinking()); 3810 CHECK(vtable.get() != NULL); 3811 int old_vtable_count = vtable->GetLength(); 3812 int new_vtable_count = old_vtable_count + miranda_list.size(); 3813 vtable.reset(vtable->CopyOf(self, new_vtable_count)); 3814 if (UNLIKELY(vtable.get() == NULL)) { 3815 CHECK(self->IsExceptionPending()); // OOME. 3816 return false; 3817 } 3818 for (size_t i = 0; i < miranda_list.size(); ++i) { 3819 mirror::ArtMethod* method = miranda_list[i]; 3820 // Leave the declaring class alone as type indices are relative to it 3821 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3822 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3823 klass->SetVirtualMethod(old_method_count + i, method); 3824 vtable->Set<false>(old_vtable_count + i, method); 3825 } 3826 // TODO: do not assign to the vtable field until it is fully constructed. 3827 klass->SetVTable(vtable.get()); 3828 } 3829 3830 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3831 for (int i = 0; i < vtable->GetLength(); ++i) { 3832 CHECK(vtable->Get(i) != NULL); 3833 } 3834 3835// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3836 3837 return true; 3838} 3839 3840bool ClassLinker::LinkInstanceFields(const SirtRef<mirror::Class>& klass) { 3841 CHECK(klass.get() != NULL); 3842 return LinkFields(klass, false); 3843} 3844 3845bool ClassLinker::LinkStaticFields(const SirtRef<mirror::Class>& klass) { 3846 CHECK(klass.get() != NULL); 3847 size_t allocated_class_size = klass->GetClassSize(); 3848 bool success = LinkFields(klass, true); 3849 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3850 return success; 3851} 3852 3853struct LinkFieldsComparator { 3854 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3855 } 3856 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3857 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 3858 NO_THREAD_SAFETY_ANALYSIS { 3859 // First come reference fields, then 64-bit, and finally 32-bit 3860 FieldHelper fh1(field1); 3861 Primitive::Type type1 = fh1.GetTypeAsPrimitiveType(); 3862 FieldHelper fh2(field2); 3863 Primitive::Type type2 = fh2.GetTypeAsPrimitiveType(); 3864 if (type1 != type2) { 3865 bool is_primitive1 = type1 != Primitive::kPrimNot; 3866 bool is_primitive2 = type2 != Primitive::kPrimNot; 3867 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3868 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3869 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 3870 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 3871 if (order1 != order2) { 3872 return order1 < order2; 3873 } 3874 } 3875 // same basic group? then sort by string. 3876 const char* name1 = fh1.GetName(); 3877 const char* name2 = fh2.GetName(); 3878 return strcmp(name1, name2) < 0; 3879 } 3880}; 3881 3882bool ClassLinker::LinkFields(const SirtRef<mirror::Class>& klass, bool is_static) { 3883 size_t num_fields = 3884 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3885 3886 mirror::ObjectArray<mirror::ArtField>* fields = 3887 is_static ? klass->GetSFields() : klass->GetIFields(); 3888 3889 // Initialize size and field_offset 3890 size_t size; 3891 MemberOffset field_offset(0); 3892 if (is_static) { 3893 size = klass->GetClassSize(); 3894 field_offset = mirror::Class::FieldsOffset(); 3895 } else { 3896 mirror::Class* super_class = klass->GetSuperClass(); 3897 if (super_class != NULL) { 3898 CHECK(super_class->IsResolved()); 3899 field_offset = MemberOffset(super_class->GetObjectSize()); 3900 } 3901 size = field_offset.Uint32Value(); 3902 } 3903 3904 CHECK_EQ(num_fields == 0, fields == NULL); 3905 3906 // we want a relatively stable order so that adding new fields 3907 // minimizes disruption of C++ version such as Class and Method. 3908 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3909 for (size_t i = 0; i < num_fields; i++) { 3910 mirror::ArtField* f = fields->Get(i); 3911 CHECK(f != NULL); 3912 grouped_and_sorted_fields.push_back(f); 3913 } 3914 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 3915 LinkFieldsComparator()); 3916 3917 // References should be at the front. 3918 size_t current_field = 0; 3919 size_t num_reference_fields = 0; 3920 for (; current_field < num_fields; current_field++) { 3921 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3922 FieldHelper fh(field); 3923 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3924 bool isPrimitive = type != Primitive::kPrimNot; 3925 if (isPrimitive) { 3926 break; // past last reference, move on to the next phase 3927 } 3928 grouped_and_sorted_fields.pop_front(); 3929 num_reference_fields++; 3930 fields->Set<false>(current_field, field); 3931 field->SetOffset(field_offset); 3932 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3933 } 3934 3935 // Now we want to pack all of the double-wide fields together. If 3936 // we're not aligned, though, we want to shuffle one 32-bit field 3937 // into place. If we can't find one, we'll have to pad it. 3938 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3939 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3940 mirror::ArtField* field = grouped_and_sorted_fields[i]; 3941 FieldHelper fh(field); 3942 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3943 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3944 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 3945 continue; 3946 } 3947 fields->Set<false>(current_field++, field); 3948 field->SetOffset(field_offset); 3949 // drop the consumed field 3950 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 3951 break; 3952 } 3953 // whether we found a 32-bit field for padding or not, we advance 3954 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3955 } 3956 3957 // Alignment is good, shuffle any double-wide fields forward, and 3958 // finish assigning field offsets to all fields. 3959 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 3960 while (!grouped_and_sorted_fields.empty()) { 3961 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3962 grouped_and_sorted_fields.pop_front(); 3963 FieldHelper fh(field); 3964 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3965 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3966 fields->Set<false>(current_field, field); 3967 field->SetOffset(field_offset); 3968 field_offset = MemberOffset(field_offset.Uint32Value() + 3969 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 3970 ? sizeof(uint64_t) 3971 : sizeof(uint32_t))); 3972 current_field++; 3973 } 3974 3975 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 3976 if (!is_static && 3977 (strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0)) { 3978 // We know there are no non-reference fields in the Reference classes, and we know 3979 // that 'referent' is alphabetically last, so this is easy... 3980 CHECK_EQ(num_reference_fields, num_fields); 3981 FieldHelper fh(fields->Get(num_fields - 1)); 3982 CHECK_STREQ(fh.GetName(), "referent"); 3983 --num_reference_fields; 3984 } 3985 3986 if (kIsDebugBuild) { 3987 // Make sure that all reference fields appear before 3988 // non-reference fields, and all double-wide fields are aligned. 3989 bool seen_non_ref = false; 3990 for (size_t i = 0; i < num_fields; i++) { 3991 mirror::ArtField* field = fields->Get(i); 3992 if (false) { // enable to debug field layout 3993 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 3994 << " class=" << PrettyClass(klass.get()) 3995 << " field=" << PrettyField(field) 3996 << " offset=" << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset()), 3997 false); 3998 } 3999 FieldHelper fh(field); 4000 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4001 bool is_primitive = type != Primitive::kPrimNot; 4002 if ((strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0) 4003 && (strcmp("referent", fh.GetName()) == 0)) { 4004 is_primitive = true; // We lied above, so we have to expect a lie here. 4005 } 4006 if (is_primitive) { 4007 if (!seen_non_ref) { 4008 seen_non_ref = true; 4009 DCHECK_EQ(num_reference_fields, i); 4010 } 4011 } else { 4012 DCHECK(!seen_non_ref); 4013 } 4014 } 4015 if (!seen_non_ref) { 4016 DCHECK_EQ(num_fields, num_reference_fields); 4017 } 4018 } 4019 size = field_offset.Uint32Value(); 4020 // Update klass 4021 if (is_static) { 4022 klass->SetNumReferenceStaticFields(num_reference_fields); 4023 klass->SetClassSize(size); 4024 } else { 4025 klass->SetNumReferenceInstanceFields(num_reference_fields); 4026 if (!klass->IsVariableSize()) { 4027 DCHECK_GE(size, sizeof(mirror::Object)) << ClassHelper(klass.get()).GetDescriptor(); 4028 size_t previous_size = klass->GetObjectSize(); 4029 if (previous_size != 0) { 4030 // Make sure that we didn't originally have an incorrect size. 4031 CHECK_EQ(previous_size, size); 4032 } 4033 klass->SetObjectSize(size); 4034 } 4035 } 4036 return true; 4037} 4038 4039// Set the bitmap of reference offsets, refOffsets, from the ifields 4040// list. 4041void ClassLinker::CreateReferenceInstanceOffsets(const SirtRef<mirror::Class>& klass) { 4042 uint32_t reference_offsets = 0; 4043 mirror::Class* super_class = klass->GetSuperClass(); 4044 if (super_class != NULL) { 4045 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4046 // If our superclass overflowed, we don't stand a chance. 4047 if (reference_offsets == CLASS_WALK_SUPER) { 4048 klass->SetReferenceInstanceOffsets(reference_offsets); 4049 return; 4050 } 4051 } 4052 CreateReferenceOffsets(klass, false, reference_offsets); 4053} 4054 4055void ClassLinker::CreateReferenceStaticOffsets(const SirtRef<mirror::Class>& klass) { 4056 CreateReferenceOffsets(klass, true, 0); 4057} 4058 4059void ClassLinker::CreateReferenceOffsets(const SirtRef<mirror::Class>& klass, bool is_static, 4060 uint32_t reference_offsets) { 4061 size_t num_reference_fields = 4062 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4063 : klass->NumReferenceInstanceFieldsDuringLinking(); 4064 mirror::ObjectArray<mirror::ArtField>* fields = 4065 is_static ? klass->GetSFields() : klass->GetIFields(); 4066 // All of the fields that contain object references are guaranteed 4067 // to be at the beginning of the fields list. 4068 for (size_t i = 0; i < num_reference_fields; ++i) { 4069 // Note that byte_offset is the offset from the beginning of 4070 // object, not the offset into instance data 4071 mirror::ArtField* field = fields->Get(i); 4072 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4073 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4074 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4075 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4076 CHECK_NE(new_bit, 0U); 4077 reference_offsets |= new_bit; 4078 } else { 4079 reference_offsets = CLASS_WALK_SUPER; 4080 break; 4081 } 4082 } 4083 // Update fields in klass 4084 if (is_static) { 4085 klass->SetReferenceStaticOffsets(reference_offsets); 4086 } else { 4087 klass->SetReferenceInstanceOffsets(reference_offsets); 4088 } 4089} 4090 4091mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4092 const SirtRef<mirror::DexCache>& dex_cache) { 4093 DCHECK(dex_cache.get() != nullptr); 4094 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4095 if (resolved != NULL) { 4096 return resolved; 4097 } 4098 uint32_t utf16_length; 4099 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4100 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4101 dex_cache->SetResolvedString(string_idx, string); 4102 return string; 4103} 4104 4105mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4106 mirror::Class* referrer) { 4107 Thread* self = Thread::Current(); 4108 SirtRef<mirror::DexCache> dex_cache(self, referrer->GetDexCache()); 4109 SirtRef<mirror::ClassLoader> class_loader(self, referrer->GetClassLoader()); 4110 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4111} 4112 4113mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4114 const SirtRef<mirror::DexCache>& dex_cache, 4115 const SirtRef<mirror::ClassLoader>& class_loader) { 4116 DCHECK(dex_cache.get() != NULL); 4117 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4118 if (resolved == NULL) { 4119 Thread* self = Thread::Current(); 4120 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4121 resolved = FindClass(self, descriptor, class_loader); 4122 if (resolved != NULL) { 4123 // TODO: we used to throw here if resolved's class loader was not the 4124 // boot class loader. This was to permit different classes with the 4125 // same name to be loaded simultaneously by different loaders 4126 dex_cache->SetResolvedType(type_idx, resolved); 4127 } else { 4128 CHECK(self->IsExceptionPending()) 4129 << "Expected pending exception for failed resolution of: " << descriptor; 4130 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4131 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 4132 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4133 DCHECK(resolved == NULL); // No SirtRef needed to preserve resolved. 4134 self->ClearException(); 4135 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4136 self->GetException(NULL)->SetCause(cause.get()); 4137 } 4138 } 4139 } 4140 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4141 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4142 return resolved; 4143} 4144 4145mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 4146 uint32_t method_idx, 4147 const SirtRef<mirror::DexCache>& dex_cache, 4148 const SirtRef<mirror::ClassLoader>& class_loader, 4149 mirror::ArtMethod* referrer, 4150 InvokeType type) { 4151 DCHECK(dex_cache.get() != NULL); 4152 // Check for hit in the dex cache. 4153 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4154 if (resolved != NULL && !resolved->IsRuntimeMethod()) { 4155 return resolved; 4156 } 4157 // Fail, get the declaring class. 4158 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4159 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4160 if (klass == NULL) { 4161 DCHECK(Thread::Current()->IsExceptionPending()); 4162 return NULL; 4163 } 4164 // Scan using method_idx, this saves string compares but will only hit for matching dex 4165 // caches/files. 4166 switch (type) { 4167 case kDirect: // Fall-through. 4168 case kStatic: 4169 resolved = klass->FindDirectMethod(dex_cache.get(), method_idx); 4170 break; 4171 case kInterface: 4172 resolved = klass->FindInterfaceMethod(dex_cache.get(), method_idx); 4173 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4174 break; 4175 case kSuper: // Fall-through. 4176 case kVirtual: 4177 resolved = klass->FindVirtualMethod(dex_cache.get(), method_idx); 4178 break; 4179 default: 4180 LOG(FATAL) << "Unreachable - invocation type: " << type; 4181 } 4182 if (resolved == NULL) { 4183 // Search by name, which works across dex files. 4184 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4185 const Signature signature = dex_file.GetMethodSignature(method_id); 4186 switch (type) { 4187 case kDirect: // Fall-through. 4188 case kStatic: 4189 resolved = klass->FindDirectMethod(name, signature); 4190 break; 4191 case kInterface: 4192 resolved = klass->FindInterfaceMethod(name, signature); 4193 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4194 break; 4195 case kSuper: // Fall-through. 4196 case kVirtual: 4197 resolved = klass->FindVirtualMethod(name, signature); 4198 break; 4199 } 4200 } 4201 if (resolved != NULL) { 4202 // We found a method, check for incompatible class changes. 4203 if (resolved->CheckIncompatibleClassChange(type)) { 4204 resolved = NULL; 4205 } 4206 } 4207 if (resolved != NULL) { 4208 // Be a good citizen and update the dex cache to speed subsequent calls. 4209 dex_cache->SetResolvedMethod(method_idx, resolved); 4210 return resolved; 4211 } else { 4212 // We failed to find the method which means either an access error, an incompatible class 4213 // change, or no such method. First try to find the method among direct and virtual methods. 4214 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4215 const Signature signature = dex_file.GetMethodSignature(method_id); 4216 switch (type) { 4217 case kDirect: 4218 case kStatic: 4219 resolved = klass->FindVirtualMethod(name, signature); 4220 break; 4221 case kInterface: 4222 case kVirtual: 4223 case kSuper: 4224 resolved = klass->FindDirectMethod(name, signature); 4225 break; 4226 } 4227 4228 // If we found something, check that it can be accessed by the referrer. 4229 if (resolved != NULL && referrer != NULL) { 4230 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4231 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4232 if (!referring_class->CanAccess(methods_class)) { 4233 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4234 resolved, type); 4235 return NULL; 4236 } else if (!referring_class->CanAccessMember(methods_class, 4237 resolved->GetAccessFlags())) { 4238 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4239 return NULL; 4240 } 4241 } 4242 4243 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4244 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4245 switch (type) { 4246 case kDirect: 4247 case kStatic: 4248 if (resolved != NULL) { 4249 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4250 } else { 4251 resolved = klass->FindInterfaceMethod(name, signature); 4252 if (resolved != NULL) { 4253 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4254 } else { 4255 ThrowNoSuchMethodError(type, klass, name, signature); 4256 } 4257 } 4258 break; 4259 case kInterface: 4260 if (resolved != NULL) { 4261 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4262 } else { 4263 resolved = klass->FindVirtualMethod(name, signature); 4264 if (resolved != NULL) { 4265 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4266 } else { 4267 ThrowNoSuchMethodError(type, klass, name, signature); 4268 } 4269 } 4270 break; 4271 case kSuper: 4272 ThrowNoSuchMethodError(type, klass, name, signature); 4273 break; 4274 case kVirtual: 4275 if (resolved != NULL) { 4276 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4277 } else { 4278 resolved = klass->FindInterfaceMethod(name, signature); 4279 if (resolved != NULL) { 4280 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4281 } else { 4282 ThrowNoSuchMethodError(type, klass, name, signature); 4283 } 4284 } 4285 break; 4286 } 4287 DCHECK(Thread::Current()->IsExceptionPending()); 4288 return NULL; 4289 } 4290} 4291 4292mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4293 const SirtRef<mirror::DexCache>& dex_cache, 4294 const SirtRef<mirror::ClassLoader>& class_loader, 4295 bool is_static) { 4296 DCHECK(dex_cache.get() != nullptr); 4297 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4298 if (resolved != NULL) { 4299 return resolved; 4300 } 4301 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4302 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4303 if (klass == NULL) { 4304 DCHECK(Thread::Current()->IsExceptionPending()); 4305 return NULL; 4306 } 4307 4308 if (is_static) { 4309 resolved = klass->FindStaticField(dex_cache.get(), field_idx); 4310 } else { 4311 resolved = klass->FindInstanceField(dex_cache.get(), field_idx); 4312 } 4313 4314 if (resolved == NULL) { 4315 const char* name = dex_file.GetFieldName(field_id); 4316 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4317 if (is_static) { 4318 resolved = klass->FindStaticField(name, type); 4319 } else { 4320 resolved = klass->FindInstanceField(name, type); 4321 } 4322 if (resolved == NULL) { 4323 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 4324 return NULL; 4325 } 4326 } 4327 dex_cache->SetResolvedField(field_idx, resolved); 4328 return resolved; 4329} 4330 4331mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4332 uint32_t field_idx, 4333 const SirtRef<mirror::DexCache>& dex_cache, 4334 const SirtRef<mirror::ClassLoader>& class_loader) { 4335 DCHECK(dex_cache.get() != nullptr); 4336 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4337 if (resolved != NULL) { 4338 return resolved; 4339 } 4340 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4341 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4342 if (klass == NULL) { 4343 DCHECK(Thread::Current()->IsExceptionPending()); 4344 return NULL; 4345 } 4346 4347 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4348 StringPiece type(dex_file.StringDataByIdx( 4349 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4350 resolved = klass->FindField(name, type); 4351 if (resolved != NULL) { 4352 dex_cache->SetResolvedField(field_idx, resolved); 4353 } else { 4354 ThrowNoSuchFieldError("", klass, type, name); 4355 } 4356 return resolved; 4357} 4358 4359const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4360 uint32_t* length) { 4361 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4362 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4363 const DexFile& dex_file = *dex_cache->GetDexFile(); 4364 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4365 return dex_file.GetMethodShorty(method_id, length); 4366} 4367 4368void ClassLinker::DumpAllClasses(int flags) { 4369 if (dex_cache_image_class_lookup_required_) { 4370 MoveImageClassesToClassTable(); 4371 } 4372 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4373 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4374 std::vector<mirror::Class*> all_classes; 4375 { 4376 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4377 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 4378 all_classes.push_back(it.second); 4379 } 4380 } 4381 4382 for (size_t i = 0; i < all_classes.size(); ++i) { 4383 all_classes[i]->DumpClass(std::cerr, flags); 4384 } 4385} 4386 4387void ClassLinker::DumpForSigQuit(std::ostream& os) { 4388 if (dex_cache_image_class_lookup_required_) { 4389 MoveImageClassesToClassTable(); 4390 } 4391 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4392 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4393} 4394 4395size_t ClassLinker::NumLoadedClasses() { 4396 if (dex_cache_image_class_lookup_required_) { 4397 MoveImageClassesToClassTable(); 4398 } 4399 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4400 return class_table_.size(); 4401} 4402 4403pid_t ClassLinker::GetClassesLockOwner() { 4404 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4405} 4406 4407pid_t ClassLinker::GetDexLockOwner() { 4408 return dex_lock_.GetExclusiveOwnerTid(); 4409} 4410 4411void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4412 DCHECK(!init_done_); 4413 4414 DCHECK(klass != NULL); 4415 DCHECK(klass->GetClassLoader() == NULL); 4416 4417 DCHECK(class_roots_ != NULL); 4418 DCHECK(class_roots_->Get(class_root) == NULL); 4419 class_roots_->Set<false>(class_root, klass); 4420} 4421 4422} // namespace art 4423