class_linker.cc revision b373e091eac39b1a79c11f2dcbd610af01e9e8a9
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()); 576 577 argv.push_back("--runtime-arg"); 578 std::string checkstr = "-implicit-checks"; 579 580 int nchecks = 0; 581 char checksep = ':'; 582 583 if (!Runtime::Current()->ExplicitNullChecks()) { 584 checkstr += checksep; 585 checksep = ','; 586 checkstr += "null"; 587 ++nchecks; 588 } 589 if (!Runtime::Current()->ExplicitSuspendChecks()) { 590 checkstr += checksep; 591 checksep = ','; 592 checkstr += "suspend"; 593 ++nchecks; 594 } 595 596 if (!Runtime::Current()->ExplicitStackOverflowChecks()) { 597 checkstr += checksep; 598 checksep = ','; 599 checkstr += "stack"; 600 ++nchecks; 601 } 602 603 if (nchecks == 0) { 604 checkstr += ":none"; 605 } 606 argv.push_back(checkstr); 607 608 if (!kIsTargetBuild) { 609 argv.push_back("--host"); 610 } 611 argv.push_back(boot_image_option); 612 argv.push_back(dex_file_option); 613 argv.push_back(oat_fd_option); 614 argv.push_back(oat_location_option); 615 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 616 for (size_t i = 0; i < compiler_options.size(); ++i) { 617 argv.push_back(compiler_options[i].c_str()); 618 } 619 620 return Exec(argv, error_msg); 621} 622 623const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 624 WriterMutexLock mu(Thread::Current(), dex_lock_); 625 if (kIsDebugBuild) { 626 for (size_t i = 0; i < oat_files_.size(); ++i) { 627 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 628 } 629 } 630 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 631 oat_files_.push_back(oat_file); 632 return oat_file; 633} 634 635OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 636 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 637 OatFile* oat_file = space->ReleaseOatFile(); 638 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 639 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 640 return *oat_file; 641} 642 643const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 644 const char* dex_location = dex_file.GetLocation().c_str(); 645 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 646 return FindOpenedOatFileFromDexLocation(dex_location, &dex_location_checksum); 647} 648 649const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation(const char* dex_location, 650 const uint32_t* const dex_location_checksum) { 651 ReaderMutexLock mu(Thread::Current(), dex_lock_); 652 for (size_t i = 0; i < oat_files_.size(); i++) { 653 const OatFile* oat_file = oat_files_[i]; 654 DCHECK(oat_file != NULL); 655 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 656 dex_location_checksum, 657 false); 658 if (oat_dex_file != NULL) { 659 return oat_file; 660 } 661 } 662 return NULL; 663} 664 665const DexFile* ClassLinker::FindDexFileInOatLocation(const char* dex_location, 666 uint32_t dex_location_checksum, 667 const char* oat_location, 668 std::string* error_msg) { 669 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 670 !Runtime::Current()->IsCompiler(), 671 error_msg)); 672 if (oat_file.get() == nullptr) { 673 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 674 error_msg->c_str()); 675 return nullptr; 676 } 677 Runtime* runtime = Runtime::Current(); 678 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 679 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 680 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 681 if (expected_image_oat_checksum != actual_image_oat_checksum) { 682 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 683 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 684 actual_image_oat_checksum); 685 return nullptr; 686 } 687 688 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 689 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 690 if (expected_image_oat_offset != actual_image_oat_offset) { 691 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 692 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 693 actual_image_oat_offset); 694 return nullptr; 695 } 696 // TODO: this registers the oat file now as we may use the oat_dex_file later and we want the 697 // intern behavior of RegisterOatFile. However, if we take an early return we could remove 698 // the oat file. 699 const OatFile* opened_oat_file = RegisterOatFile(oat_file.release()); 700 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, 701 &dex_location_checksum); 702 if (oat_dex_file == nullptr) { 703 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 704 dex_location); 705 return nullptr; 706 } 707 uint32_t expected_dex_checksum = dex_location_checksum; 708 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 709 if (expected_dex_checksum != actual_dex_checksum) { 710 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 711 "found 0x%x", oat_location, expected_dex_checksum, 712 actual_dex_checksum); 713 return nullptr; 714 } 715 return oat_dex_file->OpenDexFile(error_msg); 716} 717 718class ScopedFlock { 719 public: 720 ScopedFlock() {} 721 722 bool Init(const char* filename, std::string* error_msg) { 723 while (true) { 724 file_.reset(OS::OpenFileWithFlags(filename, O_CREAT | O_RDWR)); 725 if (file_.get() == NULL) { 726 *error_msg = StringPrintf("Failed to open file '%s'", filename); 727 return false; 728 } 729 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_EX)); 730 if (flock_result != 0) { 731 *error_msg = StringPrintf("Failed to lock file '%s': %s", filename, strerror(errno)); 732 return false; 733 } 734 struct stat fstat_stat; 735 int fstat_result = TEMP_FAILURE_RETRY(fstat(file_->Fd(), &fstat_stat)); 736 if (fstat_result != 0) { 737 *error_msg = StringPrintf("Failed to fstat file '%s': %s", filename, strerror(errno)); 738 return false; 739 } 740 struct stat stat_stat; 741 int stat_result = TEMP_FAILURE_RETRY(stat(filename, &stat_stat)); 742 if (stat_result != 0) { 743 PLOG(WARNING) << "Failed to stat, will retry: " << filename; 744 // ENOENT can happen if someone racing with us unlinks the file we created so just retry. 745 continue; 746 } 747 if (fstat_stat.st_dev != stat_stat.st_dev || fstat_stat.st_ino != stat_stat.st_ino) { 748 LOG(WARNING) << "File changed while locking, will retry: " << filename; 749 continue; 750 } 751 return true; 752 } 753 } 754 755 File& GetFile() { 756 return *file_; 757 } 758 759 ~ScopedFlock() { 760 if (file_.get() != NULL) { 761 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_UN)); 762 CHECK_EQ(0, flock_result); 763 } 764 } 765 766 private: 767 UniquePtr<File> file_; 768 769 DISALLOW_COPY_AND_ASSIGN(ScopedFlock); 770}; 771 772const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation(const char* dex_location, 773 uint32_t dex_location_checksum, 774 const char* oat_location, 775 std::string* error_msg) { 776 // We play a locking game here so that if two different processes 777 // race to generate (or worse, one tries to open a partial generated 778 // file) we will be okay. This is actually common with apps that use 779 // DexClassLoader to work around the dex method reference limit and 780 // that have a background service running in a separate process. 781 ScopedFlock scoped_flock; 782 if (!scoped_flock.Init(oat_location, error_msg)) { 783 return nullptr; 784 } 785 786 // Check if we already have an up-to-date output file 787 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, dex_location_checksum, 788 oat_location, error_msg); 789 if (dex_file != nullptr) { 790 return dex_file; 791 } 792 VLOG(class_linker) << "Failed to find dex file '" << dex_location << "' in oat location '" 793 << oat_location << "': " << *error_msg; 794 error_msg->clear(); 795 796 // Generate the output oat file for the dex file 797 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 798 if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location, error_msg)) { 799 CHECK(!error_msg->empty()); 800 return nullptr; 801 } 802 const OatFile* oat_file = OatFile::Open(oat_location, oat_location, NULL, 803 !Runtime::Current()->IsCompiler(), 804 error_msg); 805 if (oat_file == nullptr) { 806 *error_msg = StringPrintf("Failed to open generated oat file '%s': %s", 807 oat_location, error_msg->c_str()); 808 return nullptr; 809 } 810 oat_file = RegisterOatFile(oat_file); 811 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 812 &dex_location_checksum); 813 if (oat_dex_file == nullptr) { 814 *error_msg = StringPrintf("Failed to find dex file '%s' (checksum 0x%x) in generated out file " 815 "'%s'", dex_location, dex_location_checksum, oat_location); 816 return nullptr; 817 } 818 const DexFile* result = oat_dex_file->OpenDexFile(error_msg); 819 CHECK(result != nullptr) << *error_msg; 820 CHECK_EQ(dex_location_checksum, result->GetLocationChecksum()) 821 << "dex_location=" << dex_location << " oat_location=" << oat_location << std::hex 822 << " dex_location_checksum=" << dex_location_checksum 823 << " DexFile::GetLocationChecksum()=" << result->GetLocationChecksum(); 824 return result; 825} 826 827bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 828 const char* dex_location, 829 uint32_t dex_location_checksum, 830 std::string* error_msg) { 831 Runtime* runtime = Runtime::Current(); 832 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 833 uint32_t image_oat_checksum = image_header.GetOatChecksum(); 834 uintptr_t image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 835 bool image_check = ((oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum) 836 && (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 837 838 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 839 if (oat_dex_file == NULL) { 840 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 841 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 842 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 843 for (size_t i = 0; i < oat_dex_files.size(); i++) { 844 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 845 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 846 oat_file->GetLocation().c_str(), 847 oat_dex_file->GetDexFileLocation().c_str()); 848 } 849 return false; 850 } 851 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 852 853 if (image_check && dex_check) { 854 return true; 855 } 856 857 if (!image_check) { 858 ScopedObjectAccess soa(Thread::Current()); 859 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with (0x%x, %" PRIdPTR ")", 860 oat_file->GetLocation().c_str(), 861 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 862 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 863 image_oat_checksum, image_oat_data_begin); 864 } 865 if (!dex_check) { 866 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 867 oat_file->GetLocation().c_str(), 868 oat_dex_file->GetDexFileLocationChecksum(), 869 dex_location, dex_location_checksum); 870 } 871 return false; 872} 873 874const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const std::string& oat_file_location, 875 const char* dex_location, 876 std::string* error_msg, 877 bool* open_failed) { 878 UniquePtr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 879 if (oat_file.get() == nullptr) { 880 *open_failed = true; 881 return nullptr; 882 } 883 *open_failed = false; 884 uint32_t dex_location_checksum; 885 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 886 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 887 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 888 // directory. 889 const OatFile* opened_oat_file = oat_file.release(); 890 opened_oat_file = RegisterOatFile(opened_oat_file); 891 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, NULL); 892 if (oat_dex_file == nullptr) { 893 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 894 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 895 error_msg->c_str()); 896 return nullptr; 897 } 898 return oat_dex_file->OpenDexFile(error_msg); 899 } 900 901 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 902 error_msg); 903 if (!verified) { 904 return nullptr; 905 } 906 const OatFile* opened_oat_file = oat_file.release(); 907 opened_oat_file = RegisterOatFile(opened_oat_file); 908 return opened_oat_file->GetOatDexFile(dex_location, 909 &dex_location_checksum)->OpenDexFile(error_msg); 910} 911 912const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const char* dex_location, 913 const uint32_t* const dex_location_checksum, 914 std::string* error_msg) { 915 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location, 916 dex_location_checksum); 917 if (open_oat_file != nullptr) { 918 const OatFile::OatDexFile* oat_dex_file = open_oat_file->GetOatDexFile(dex_location, 919 dex_location_checksum); 920 return oat_dex_file->OpenDexFile(error_msg); 921 } 922 923 // Look for an existing file next to dex. for example, for 924 // /foo/bar/baz.jar, look for /foo/bar/baz.odex. 925 std::string odex_filename(OatFile::DexFilenameToOdexFilename(dex_location)); 926 bool open_failed; 927 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(odex_filename, dex_location, 928 error_msg, &open_failed); 929 if (dex_file != nullptr) { 930 return dex_file; 931 } 932 if (dex_location_checksum == nullptr) { 933 *error_msg = StringPrintf("Failed to open oat file from %s and no classes.dex found in %s: %s", 934 odex_filename.c_str(), dex_location, error_msg->c_str()); 935 return nullptr; 936 } 937 938 std::string cache_error_msg; 939 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location)); 940 dex_file = VerifyAndOpenDexFileFromOatFile(cache_location, dex_location, &cache_error_msg, 941 &open_failed); 942 if (dex_file != nullptr) { 943 return dex_file; 944 } 945 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 946 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 947 } 948 VLOG(class_linker) << "Failed to open oat file from " << odex_filename 949 << " (error '" << *error_msg << "') or " << cache_location 950 << " (error '" << cache_error_msg << "')."; 951 952 // Try to generate oat file if it wasn't found or was obsolete. 953 error_msg->clear(); 954 return FindOrCreateOatFileForDexLocation(dex_location, *dex_location_checksum, 955 cache_location.c_str(), error_msg); 956} 957 958const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 959 ReaderMutexLock mu(Thread::Current(), dex_lock_); 960 for (size_t i = 0; i < oat_files_.size(); i++) { 961 const OatFile* oat_file = oat_files_[i]; 962 DCHECK(oat_file != nullptr); 963 if (oat_file->GetLocation() == oat_location) { 964 return oat_file; 965 } 966 } 967 return nullptr; 968} 969 970const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 971 std::string* error_msg) { 972 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 973 if (oat_file != nullptr) { 974 return oat_file; 975 } 976 977 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 978 error_msg); 979 if (oat_file == NULL) { 980 return NULL; 981 } 982 return oat_file; 983} 984 985static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 986 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 987 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 988 989 DCHECK(obj != NULL); 990 DCHECK(class_linker != NULL); 991 992 if (obj->IsArtMethod()) { 993 mirror::ArtMethod* method = obj->AsArtMethod(); 994 if (!method->IsNative()) { 995 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 996 if (method != Runtime::Current()->GetResolutionMethod()) { 997 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 998 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 999 } 1000 } 1001 } 1002} 1003 1004void ClassLinker::InitFromImage() { 1005 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1006 CHECK(!init_done_); 1007 1008 Thread* self = Thread::Current(); 1009 gc::Heap* heap = Runtime::Current()->GetHeap(); 1010 gc::space::ImageSpace* space = heap->GetImageSpace(); 1011 dex_cache_image_class_lookup_required_ = true; 1012 CHECK(space != NULL); 1013 OatFile& oat_file = GetImageOatFile(space); 1014 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1015 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1016 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 1017 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1018 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1019 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1020 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1021 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1022 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1023 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1024 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1025 1026 SirtRef<mirror::ObjectArray<mirror::Class> > class_roots( 1027 self, 1028 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>()); 1029 class_roots_ = class_roots.get(); 1030 1031 // Special case of setting up the String class early so that we can test arbitrary objects 1032 // as being Strings or not 1033 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1034 1035 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1036 static_cast<uint32_t>(dex_caches->GetLength())); 1037 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1038 SirtRef<mirror::DexCache> dex_cache(self, dex_caches->Get(i)); 1039 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1040 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1041 nullptr); 1042 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1043 std::string error_msg; 1044 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1045 if (dex_file == NULL) { 1046 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1047 << " from within oat file " << oat_file.GetLocation() 1048 << " error '" << error_msg << "'"; 1049 } 1050 1051 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1052 1053 AppendToBootClassPath(*dex_file, dex_cache); 1054 } 1055 1056 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1057 // bitmap walk. 1058 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1059 1060 // Set entry point to interpreter if in InterpretOnly mode. 1061 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1062 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1063 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1064 } 1065 1066 // reinit class_roots_ 1067 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1068 class_roots_ = class_roots.get(); 1069 1070 // reinit array_iftable_ from any array class instance, they should be == 1071 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1072 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1073 // String class root was set above 1074 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1075 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1076 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1077 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1078 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1079 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1080 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1081 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1082 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1083 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1084 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1085 1086 FinishInit(self); 1087 1088 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1089} 1090 1091// Keep in sync with InitCallback. Anything we visit, we need to 1092// reinit references to when reinitializing a ClassLinker from a 1093// mapped image. 1094void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1095 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1096 Thread* self = Thread::Current(); 1097 { 1098 ReaderMutexLock mu(self, dex_lock_); 1099 if ((flags & kVisitRootFlagAllRoots) != 0) { 1100 for (mirror::DexCache*& dex_cache : dex_caches_) { 1101 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1102 } 1103 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1104 for (size_t index : new_dex_cache_roots_) { 1105 callback(reinterpret_cast<mirror::Object**>(&dex_caches_[index]), arg, 0, kRootVMInternal); 1106 } 1107 } 1108 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1109 new_dex_cache_roots_.clear(); 1110 } 1111 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1112 log_new_dex_caches_roots_ = true; 1113 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1114 log_new_dex_caches_roots_ = false; 1115 } 1116 } 1117 { 1118 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 1119 if ((flags & kVisitRootFlagAllRoots) != 0) { 1120 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1121 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1122 } 1123 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1124 for (auto& pair : new_class_roots_) { 1125 mirror::Object* old_ref = pair.second; 1126 callback(reinterpret_cast<mirror::Object**>(&pair.second), arg, 0, kRootStickyClass); 1127 if (UNLIKELY(pair.second != old_ref)) { 1128 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1129 // corresponding object. This is slow, but luckily for us, this may only happen with a 1130 // concurrent moving GC. 1131 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1132 it != end && it->first == pair.first; ++it) { 1133 // If the class stored matches the old class, update it to the new value. 1134 if (old_ref == it->second) { 1135 it->second = pair.second; 1136 } 1137 } 1138 } 1139 } 1140 } 1141 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1142 new_class_roots_.clear(); 1143 } 1144 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1145 log_new_class_table_roots_ = true; 1146 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1147 log_new_class_table_roots_ = false; 1148 } 1149 // We deliberately ignore the class roots in the image since we 1150 // handle image roots by using the MS/CMS rescanning of dirty cards. 1151 } 1152 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1153 DCHECK(array_iftable_ != nullptr); 1154 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1155 if (find_array_class_cache_[i] != nullptr) { 1156 callback(reinterpret_cast<mirror::Object**>(&find_array_class_cache_[i]), arg, 0, 1157 kRootVMInternal); 1158 } 1159 } 1160} 1161 1162void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1163 if (dex_cache_image_class_lookup_required_) { 1164 MoveImageClassesToClassTable(); 1165 } 1166 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1167 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 1168 if (!visitor(it.second, arg)) { 1169 return; 1170 } 1171 } 1172} 1173 1174static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1175 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1176 classes->insert(c); 1177 return true; 1178} 1179 1180void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1181 std::set<mirror::Class*> classes; 1182 VisitClasses(GetClassesVisitor, &classes); 1183 for (mirror::Class* klass : classes) { 1184 if (!visitor(klass, arg)) { 1185 return; 1186 } 1187 } 1188} 1189 1190ClassLinker::~ClassLinker() { 1191 mirror::Class::ResetClass(); 1192 mirror::String::ResetClass(); 1193 mirror::ArtField::ResetClass(); 1194 mirror::ArtMethod::ResetClass(); 1195 mirror::BooleanArray::ResetArrayClass(); 1196 mirror::ByteArray::ResetArrayClass(); 1197 mirror::CharArray::ResetArrayClass(); 1198 mirror::DoubleArray::ResetArrayClass(); 1199 mirror::FloatArray::ResetArrayClass(); 1200 mirror::IntArray::ResetArrayClass(); 1201 mirror::LongArray::ResetArrayClass(); 1202 mirror::ShortArray::ResetArrayClass(); 1203 mirror::Throwable::ResetClass(); 1204 mirror::StackTraceElement::ResetClass(); 1205 STLDeleteElements(&boot_class_path_); 1206 STLDeleteElements(&oat_files_); 1207} 1208 1209mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1210 gc::Heap* heap = Runtime::Current()->GetHeap(); 1211 SirtRef<mirror::Class> dex_cache_class(self, GetClassRoot(kJavaLangDexCache)); 1212 SirtRef<mirror::DexCache> dex_cache( 1213 self, down_cast<mirror::DexCache*>( 1214 heap->AllocObject<true>(self, dex_cache_class.get(), dex_cache_class->GetObjectSize()))); 1215 if (dex_cache.get() == NULL) { 1216 return NULL; 1217 } 1218 SirtRef<mirror::String> 1219 location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str())); 1220 if (location.get() == NULL) { 1221 return NULL; 1222 } 1223 SirtRef<mirror::ObjectArray<mirror::String> > 1224 strings(self, AllocStringArray(self, dex_file.NumStringIds())); 1225 if (strings.get() == NULL) { 1226 return NULL; 1227 } 1228 SirtRef<mirror::ObjectArray<mirror::Class> > 1229 types(self, AllocClassArray(self, dex_file.NumTypeIds())); 1230 if (types.get() == NULL) { 1231 return NULL; 1232 } 1233 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 1234 methods(self, AllocArtMethodArray(self, dex_file.NumMethodIds())); 1235 if (methods.get() == NULL) { 1236 return NULL; 1237 } 1238 SirtRef<mirror::ObjectArray<mirror::ArtField> > 1239 fields(self, AllocArtFieldArray(self, dex_file.NumFieldIds())); 1240 if (fields.get() == NULL) { 1241 return NULL; 1242 } 1243 dex_cache->Init(&dex_file, location.get(), strings.get(), types.get(), methods.get(), 1244 fields.get()); 1245 return dex_cache.get(); 1246} 1247 1248// Used to initialize a class in the allocation code path to ensure it is guarded by a StoreStore 1249// fence. 1250class InitializeClassVisitor { 1251 public: 1252 explicit InitializeClassVisitor(uint32_t class_size) : class_size_(class_size) { 1253 } 1254 1255 void operator()(mirror::Object* obj, size_t usable_size) const 1256 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1257 DCHECK_LE(class_size_, usable_size); 1258 // Avoid AsClass as object is not yet in live bitmap or allocation stack. 1259 mirror::Class* klass = down_cast<mirror::Class*>(obj); 1260 // DCHECK(klass->IsClass()); 1261 klass->SetClassSize(class_size_); 1262 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1263 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1264 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1265 } 1266 1267 private: 1268 const uint32_t class_size_; 1269 1270 DISALLOW_COPY_AND_ASSIGN(InitializeClassVisitor); 1271}; 1272 1273mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1274 uint32_t class_size) { 1275 DCHECK_GE(class_size, sizeof(mirror::Class)); 1276 gc::Heap* heap = Runtime::Current()->GetHeap(); 1277 InitializeClassVisitor visitor(class_size); 1278 mirror::Object* k = 1279 kMovingClasses ? heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) 1280 : heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1281 if (UNLIKELY(k == nullptr)) { 1282 CHECK(self->IsExceptionPending()); // OOME. 1283 return nullptr; 1284 } 1285 return k->AsClass(); 1286} 1287 1288mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1289 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1290} 1291 1292mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1293 return down_cast<mirror::ArtField*>( 1294 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1295} 1296 1297mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1298 return down_cast<mirror::ArtMethod*>( 1299 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1300} 1301 1302mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1303 Thread* self, size_t length) { 1304 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1305 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1306} 1307 1308static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1309 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1310 DCHECK(klass != NULL); 1311 // Wait for the class if it has not already been linked. 1312 if (!klass->IsResolved() && !klass->IsErroneous()) { 1313 SirtRef<mirror::Class> sirt_class(self, klass); 1314 ObjectLock<mirror::Class> lock(self, &sirt_class); 1315 // Check for circular dependencies between classes. 1316 if (!sirt_class->IsResolved() && sirt_class->GetClinitThreadId() == self->GetTid()) { 1317 ThrowClassCircularityError(sirt_class.get()); 1318 sirt_class->SetStatus(mirror::Class::kStatusError, self); 1319 return nullptr; 1320 } 1321 // Wait for the pending initialization to complete. 1322 while (!sirt_class->IsResolved() && !sirt_class->IsErroneous()) { 1323 lock.WaitIgnoringInterrupts(); 1324 } 1325 klass = sirt_class.get(); 1326 } 1327 if (klass->IsErroneous()) { 1328 ThrowEarlierClassFailure(klass); 1329 return nullptr; 1330 } 1331 // Return the loaded class. No exceptions should be pending. 1332 CHECK(klass->IsResolved()) << PrettyClass(klass); 1333 self->AssertNoPendingException(); 1334 return klass; 1335} 1336 1337mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1338 const SirtRef<mirror::ClassLoader>& class_loader) { 1339 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1340 DCHECK(self != nullptr); 1341 self->AssertNoPendingException(); 1342 if (descriptor[1] == '\0') { 1343 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1344 // for primitive classes that aren't backed by dex files. 1345 return FindPrimitiveClass(descriptor[0]); 1346 } 1347 // Find the class in the loaded classes table. 1348 mirror::Class* klass = LookupClass(descriptor, class_loader.get()); 1349 if (klass != NULL) { 1350 return EnsureResolved(self, klass); 1351 } 1352 // Class is not yet loaded. 1353 if (descriptor[0] == '[') { 1354 return CreateArrayClass(self, descriptor, class_loader); 1355 } else if (class_loader.get() == nullptr) { 1356 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1357 if (pair.second != NULL) { 1358 SirtRef<mirror::ClassLoader> class_loader(self, nullptr); 1359 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1360 } 1361 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1362 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1363 // throw of a NoClassDefFoundError. 1364 if (IsInBootClassPath(descriptor)) { 1365 mirror::Class* system_class = FindSystemClass(self, descriptor); 1366 CHECK(system_class != NULL); 1367 return system_class; 1368 } 1369 // Next try the compile time class path. 1370 const std::vector<const DexFile*>* class_path; 1371 { 1372 ScopedObjectAccessUnchecked soa(self); 1373 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1374 soa.AddLocalReference<jobject>(class_loader.get())); 1375 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1376 } 1377 1378 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1379 if (pair.second != NULL) { 1380 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1381 } 1382 1383 } else { 1384 ScopedObjectAccessUnchecked soa(self); 1385 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1386 soa.AddLocalReference<jobject>(class_loader.get())); 1387 std::string class_name_string(DescriptorToDot(descriptor)); 1388 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1389 { 1390 ScopedThreadStateChange tsc(self, kNative); 1391 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1392 soa.Env()->NewStringUTF(class_name_string.c_str())); 1393 if (class_name_object.get() == NULL) { 1394 return NULL; 1395 } 1396 CHECK(class_loader_object.get() != NULL); 1397 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1398 WellKnownClasses::java_lang_ClassLoader_loadClass, 1399 class_name_object.get())); 1400 } 1401 if (self->IsExceptionPending()) { 1402 // If the ClassLoader threw, pass that exception up. 1403 return NULL; 1404 } else if (result.get() == NULL) { 1405 // broken loader - throw NPE to be compatible with Dalvik 1406 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1407 class_name_string.c_str()).c_str()); 1408 return NULL; 1409 } else { 1410 // success, return mirror::Class* 1411 return soa.Decode<mirror::Class*>(result.get()); 1412 } 1413 } 1414 1415 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1416 return NULL; 1417} 1418 1419mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1420 const SirtRef<mirror::ClassLoader>& class_loader, 1421 const DexFile& dex_file, 1422 const DexFile::ClassDef& dex_class_def) { 1423 Thread* self = Thread::Current(); 1424 SirtRef<mirror::Class> klass(self, NULL); 1425 // Load the class from the dex file. 1426 if (UNLIKELY(!init_done_)) { 1427 // finish up init of hand crafted class_roots_ 1428 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1429 klass.reset(GetClassRoot(kJavaLangObject)); 1430 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1431 klass.reset(GetClassRoot(kJavaLangClass)); 1432 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1433 klass.reset(GetClassRoot(kJavaLangString)); 1434 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1435 klass.reset(GetClassRoot(kJavaLangDexCache)); 1436 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1437 klass.reset(GetClassRoot(kJavaLangReflectArtField)); 1438 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1439 klass.reset(GetClassRoot(kJavaLangReflectArtMethod)); 1440 } else { 1441 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1442 } 1443 } else { 1444 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1445 } 1446 if (UNLIKELY(klass.get() == NULL)) { 1447 CHECK(self->IsExceptionPending()); // Expect an OOME. 1448 return NULL; 1449 } 1450 klass->SetDexCache(FindDexCache(dex_file)); 1451 LoadClass(dex_file, dex_class_def, klass, class_loader.get()); 1452 // Check for a pending exception during load 1453 if (self->IsExceptionPending()) { 1454 klass->SetStatus(mirror::Class::kStatusError, self); 1455 return NULL; 1456 } 1457 ObjectLock<mirror::Class> lock(self, &klass); 1458 klass->SetClinitThreadId(self->GetTid()); 1459 // Add the newly loaded class to the loaded classes table. 1460 mirror::Class* existing = InsertClass(descriptor, klass.get(), Hash(descriptor)); 1461 if (existing != NULL) { 1462 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1463 // this thread to block. 1464 return EnsureResolved(self, existing); 1465 } 1466 // Finish loading (if necessary) by finding parents 1467 CHECK(!klass->IsLoaded()); 1468 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1469 // Loading failed. 1470 klass->SetStatus(mirror::Class::kStatusError, self); 1471 return NULL; 1472 } 1473 CHECK(klass->IsLoaded()); 1474 // Link the class (if necessary) 1475 CHECK(!klass->IsResolved()); 1476 // TODO: Use fast jobjects? 1477 SirtRef<mirror::ObjectArray<mirror::Class> > interfaces(self, nullptr); 1478 if (!LinkClass(self, klass, interfaces)) { 1479 // Linking failed. 1480 klass->SetStatus(mirror::Class::kStatusError, self); 1481 return NULL; 1482 } 1483 CHECK(klass->IsResolved()); 1484 1485 /* 1486 * We send CLASS_PREPARE events to the debugger from here. The 1487 * definition of "preparation" is creating the static fields for a 1488 * class and initializing them to the standard default values, but not 1489 * executing any code (that comes later, during "initialization"). 1490 * 1491 * We did the static preparation in LinkClass. 1492 * 1493 * The class has been prepared and resolved but possibly not yet verified 1494 * at this point. 1495 */ 1496 Dbg::PostClassPrepare(klass.get()); 1497 1498 return klass.get(); 1499} 1500 1501// Precomputes size that will be needed for Class, matching LinkStaticFields 1502uint32_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1503 const DexFile::ClassDef& dex_class_def) { 1504 const byte* class_data = dex_file.GetClassData(dex_class_def); 1505 size_t num_ref = 0; 1506 size_t num_32 = 0; 1507 size_t num_64 = 0; 1508 if (class_data != NULL) { 1509 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1510 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1511 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1512 char c = descriptor[0]; 1513 if (c == 'L' || c == '[') { 1514 num_ref++; 1515 } else if (c == 'J' || c == 'D') { 1516 num_64++; 1517 } else { 1518 num_32++; 1519 } 1520 } 1521 } 1522 // start with generic class data 1523 uint32_t size = sizeof(mirror::Class); 1524 // follow with reference fields which must be contiguous at start 1525 size += (num_ref * sizeof(uint32_t)); 1526 // if there are 64-bit fields to add, make sure they are aligned 1527 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1528 if (num_32 != 0) { 1529 // use an available 32-bit field for padding 1530 num_32--; 1531 } 1532 size += sizeof(uint32_t); // either way, we are adding a word 1533 DCHECK_EQ(size, RoundUp(size, 8)); 1534 } 1535 // tack on any 64-bit fields now that alignment is assured 1536 size += (num_64 * sizeof(uint64_t)); 1537 // tack on any remaining 32-bit fields 1538 size += (num_32 * sizeof(uint32_t)); 1539 return size; 1540} 1541 1542const OatFile::OatClass* ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1543 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1544 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1545 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1546 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1547 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1548 &dex_location_checksum); 1549 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1550 const OatFile::OatClass* oat_class = oat_dex_file->GetOatClass(class_def_idx); 1551 CHECK(oat_class != NULL) << dex_file.GetLocation() << " " << class_def_idx; 1552 return oat_class; 1553} 1554 1555static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1556 uint32_t method_idx) { 1557 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1558 const byte* class_data = dex_file.GetClassData(class_def); 1559 CHECK(class_data != NULL); 1560 ClassDataItemIterator it(dex_file, class_data); 1561 // Skip fields 1562 while (it.HasNextStaticField()) { 1563 it.Next(); 1564 } 1565 while (it.HasNextInstanceField()) { 1566 it.Next(); 1567 } 1568 // Process methods 1569 size_t class_def_method_index = 0; 1570 while (it.HasNextDirectMethod()) { 1571 if (it.GetMemberIndex() == method_idx) { 1572 return class_def_method_index; 1573 } 1574 class_def_method_index++; 1575 it.Next(); 1576 } 1577 while (it.HasNextVirtualMethod()) { 1578 if (it.GetMemberIndex() == method_idx) { 1579 return class_def_method_index; 1580 } 1581 class_def_method_index++; 1582 it.Next(); 1583 } 1584 DCHECK(!it.HasNext()); 1585 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1586 return 0; 1587} 1588 1589const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1590 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1591 // method for direct methods (or virtual methods made direct). 1592 mirror::Class* declaring_class = method->GetDeclaringClass(); 1593 size_t oat_method_index; 1594 if (method->IsStatic() || method->IsDirect()) { 1595 // Simple case where the oat method index was stashed at load time. 1596 oat_method_index = method->GetMethodIndex(); 1597 } else { 1598 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1599 // by search for its position in the declared virtual methods. 1600 oat_method_index = declaring_class->NumDirectMethods(); 1601 size_t end = declaring_class->NumVirtualMethods(); 1602 bool found = false; 1603 for (size_t i = 0; i < end; i++) { 1604 if (declaring_class->GetVirtualMethod(i) == method) { 1605 found = true; 1606 break; 1607 } 1608 oat_method_index++; 1609 } 1610 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1611 } 1612 UniquePtr<const OatFile::OatClass> 1613 oat_class(GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1614 declaring_class->GetDexClassDefIndex())); 1615 CHECK(oat_class.get() != NULL); 1616 DCHECK_EQ(oat_method_index, 1617 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1618 method->GetDeclaringClass()->GetDexClassDefIndex(), 1619 method->GetDexMethodIndex())); 1620 1621 return oat_class->GetOatMethod(oat_method_index); 1622} 1623 1624// Special case to get oat code without overwriting a trampoline. 1625const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1626 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1627 if (method->IsProxyMethod()) { 1628 return GetQuickProxyInvokeHandler(); 1629 } 1630 const void* result = GetOatMethodFor(method).GetQuickCode(); 1631 if (result == nullptr) { 1632 if (method->IsNative()) { 1633 // No code and native? Use generic trampoline. 1634 result = GetQuickGenericJniTrampoline(); 1635 } else if (method->IsPortableCompiled()) { 1636 // No code? Do we expect portable code? 1637 result = GetQuickToPortableBridge(); 1638 } else { 1639 // No code? You must mean to go into the interpreter. 1640 result = GetQuickToInterpreterBridge(); 1641 } 1642 } 1643 return result; 1644} 1645 1646const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1647 bool* have_portable_code) { 1648 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1649 *have_portable_code = false; 1650 if (method->IsProxyMethod()) { 1651 return GetPortableProxyInvokeHandler(); 1652 } 1653 const void* result = GetOatMethodFor(method).GetPortableCode(); 1654 if (result == nullptr) { 1655 if (GetOatMethodFor(method).GetQuickCode() == nullptr) { 1656 // No code? You must mean to go into the interpreter. 1657 result = GetPortableToInterpreterBridge(); 1658 } else { 1659 // No code? But there's quick code, so use a bridge. 1660 result = GetPortableToQuickBridge(); 1661 } 1662 } else { 1663 *have_portable_code = true; 1664 } 1665 return result; 1666} 1667 1668const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1669 uint32_t method_idx) { 1670 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1671 CHECK(oat_class.get() != nullptr); 1672 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1673 return oat_class->GetOatMethod(oat_method_idx).GetQuickCode(); 1674} 1675 1676const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1677 uint32_t method_idx) { 1678 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1679 CHECK(oat_class.get() != nullptr); 1680 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1681 return oat_class->GetOatMethod(oat_method_idx).GetPortableCode(); 1682} 1683 1684// Returns true if the method must run with interpreter, false otherwise. 1685static bool NeedsInterpreter(mirror::ArtMethod* method, const void* quick_code, 1686 const void* portable_code) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1687 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1688 // No code: need interpreter. 1689 // May return true for native code, in the case of generic JNI 1690 // DCHECK(!method->IsNative()); 1691 return true; 1692 } 1693#ifdef ART_SEA_IR_MODE 1694 ScopedObjectAccess soa(Thread::Current()); 1695 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1696 LOG(INFO) << "Found " << PrettyMethod(method); 1697 return false; 1698 } 1699#endif 1700 // If interpreter mode is enabled, every method (except native and proxy) must 1701 // be run with interpreter. 1702 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1703 !method->IsNative() && !method->IsProxyMethod(); 1704} 1705 1706void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1707 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1708 if (klass->NumDirectMethods() == 0) { 1709 return; // No direct methods => no static methods. 1710 } 1711 Runtime* runtime = Runtime::Current(); 1712 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1713 return; // OAT file unavailable. 1714 } 1715 ClassHelper kh(klass); 1716 const DexFile& dex_file = kh.GetDexFile(); 1717 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 1718 CHECK(dex_class_def != nullptr); 1719 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1720 // There should always be class data if there were direct methods. 1721 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1722 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1723 CHECK(oat_class.get() != nullptr); 1724 ClassDataItemIterator it(dex_file, class_data); 1725 // Skip fields 1726 while (it.HasNextStaticField()) { 1727 it.Next(); 1728 } 1729 while (it.HasNextInstanceField()) { 1730 it.Next(); 1731 } 1732 // Link the code of methods skipped by LinkCode. 1733 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1734 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1735 if (!method->IsStatic()) { 1736 // Only update static methods. 1737 continue; 1738 } 1739 const void* portable_code = oat_class->GetOatMethod(method_index).GetPortableCode(); 1740 const void* quick_code = oat_class->GetOatMethod(method_index).GetQuickCode(); 1741 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1742 bool have_portable_code = false; 1743 if (enter_interpreter) { 1744 // Use interpreter entry point. 1745 // Check whether the method is native, in which case it's generic JNI. 1746 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 1747 quick_code = GetQuickGenericJniTrampoline(); 1748 portable_code = GetPortableToQuickBridge(); 1749 } else { 1750 portable_code = GetPortableToInterpreterBridge(); 1751 quick_code = GetQuickToInterpreterBridge(); 1752 } 1753 } else { 1754 if (portable_code == nullptr) { 1755 portable_code = GetPortableToQuickBridge(); 1756 } else { 1757 have_portable_code = true; 1758 } 1759 if (quick_code == nullptr) { 1760 quick_code = GetQuickToPortableBridge(); 1761 } 1762 } 1763 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1764 have_portable_code); 1765 } 1766 // Ignore virtual methods on the iterator. 1767} 1768 1769static void LinkCode(const SirtRef<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class, 1770 uint32_t method_index) 1771 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1772 // Method shouldn't have already been linked. 1773 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1774 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1775 // Every kind of method should at least get an invoke stub from the oat_method. 1776 // non-abstract methods also get their code pointers. 1777 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1778 oat_method.LinkMethod(method.get()); 1779 1780 // Install entry point from interpreter. 1781 Runtime* runtime = Runtime::Current(); 1782 bool enter_interpreter = NeedsInterpreter(method.get(), 1783 method->GetEntryPointFromQuickCompiledCode(), 1784 method->GetEntryPointFromPortableCompiledCode()); 1785 if (enter_interpreter && !method->IsNative()) { 1786 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1787 } else { 1788 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1789 } 1790 1791 if (method->IsAbstract()) { 1792 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1793 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1794 return; 1795 } 1796 1797 bool have_portable_code = false; 1798 if (method->IsStatic() && !method->IsConstructor()) { 1799 // For static methods excluding the class initializer, install the trampoline. 1800 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1801 // after initializing class (see ClassLinker::InitializeClass method). 1802 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline(runtime->GetClassLinker())); 1803 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline(runtime->GetClassLinker())); 1804 } else if (enter_interpreter) { 1805 if (!method->IsNative()) { 1806 // Set entry point from compiled code if there's no code or in interpreter only mode. 1807 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1808 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1809 } else { 1810 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 1811 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1812 } 1813 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1814 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1815 have_portable_code = true; 1816 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1817 } else { 1818 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1819 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1820 } 1821 1822 if (method->IsNative()) { 1823 // Unregistering restores the dlsym lookup stub. 1824 method->UnregisterNative(Thread::Current()); 1825 } 1826 1827 // Allow instrumentation its chance to hijack code. 1828 runtime->GetInstrumentation()->UpdateMethodsCode(method.get(), 1829 method->GetEntryPointFromQuickCompiledCode(), 1830 method->GetEntryPointFromPortableCompiledCode(), 1831 have_portable_code); 1832} 1833 1834void ClassLinker::LoadClass(const DexFile& dex_file, 1835 const DexFile::ClassDef& dex_class_def, 1836 const SirtRef<mirror::Class>& klass, 1837 mirror::ClassLoader* class_loader) { 1838 CHECK(klass.get() != NULL); 1839 CHECK(klass->GetDexCache() != NULL); 1840 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1841 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1842 CHECK(descriptor != NULL); 1843 1844 klass->SetClass(GetClassRoot(kJavaLangClass)); 1845 if (kUseBrooksPointer) { 1846 klass->AssertSelfBrooksPointer(); 1847 } 1848 uint32_t access_flags = dex_class_def.access_flags_; 1849 // Make sure that none of our runtime-only flags are set. 1850 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1851 klass->SetAccessFlags(access_flags); 1852 klass->SetClassLoader(class_loader); 1853 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1854 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1855 1856 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1857 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1858 1859 // Load fields fields. 1860 const byte* class_data = dex_file.GetClassData(dex_class_def); 1861 if (class_data == NULL) { 1862 return; // no fields or methods - for example a marker interface 1863 } 1864 ClassDataItemIterator it(dex_file, class_data); 1865 Thread* self = Thread::Current(); 1866 if (it.NumStaticFields() != 0) { 1867 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1868 if (UNLIKELY(statics == NULL)) { 1869 CHECK(self->IsExceptionPending()); // OOME. 1870 return; 1871 } 1872 klass->SetSFields(statics); 1873 } 1874 if (it.NumInstanceFields() != 0) { 1875 mirror::ObjectArray<mirror::ArtField>* fields = 1876 AllocArtFieldArray(self, it.NumInstanceFields()); 1877 if (UNLIKELY(fields == NULL)) { 1878 CHECK(self->IsExceptionPending()); // OOME. 1879 return; 1880 } 1881 klass->SetIFields(fields); 1882 } 1883 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1884 SirtRef<mirror::ArtField> sfield(self, AllocArtField(self)); 1885 if (UNLIKELY(sfield.get() == NULL)) { 1886 CHECK(self->IsExceptionPending()); // OOME. 1887 return; 1888 } 1889 klass->SetStaticField(i, sfield.get()); 1890 LoadField(dex_file, it, klass, sfield); 1891 } 1892 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1893 SirtRef<mirror::ArtField> ifield(self, AllocArtField(self)); 1894 if (UNLIKELY(ifield.get() == NULL)) { 1895 CHECK(self->IsExceptionPending()); // OOME. 1896 return; 1897 } 1898 klass->SetInstanceField(i, ifield.get()); 1899 LoadField(dex_file, it, klass, ifield); 1900 } 1901 1902 UniquePtr<const OatFile::OatClass> oat_class; 1903 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1904 oat_class.reset(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1905 } 1906 1907 // Load methods. 1908 if (it.NumDirectMethods() != 0) { 1909 // TODO: append direct methods to class object 1910 mirror::ObjectArray<mirror::ArtMethod>* directs = 1911 AllocArtMethodArray(self, it.NumDirectMethods()); 1912 if (UNLIKELY(directs == NULL)) { 1913 CHECK(self->IsExceptionPending()); // OOME. 1914 return; 1915 } 1916 klass->SetDirectMethods(directs); 1917 } 1918 if (it.NumVirtualMethods() != 0) { 1919 // TODO: append direct methods to class object 1920 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1921 AllocArtMethodArray(self, it.NumVirtualMethods()); 1922 if (UNLIKELY(virtuals == NULL)) { 1923 CHECK(self->IsExceptionPending()); // OOME. 1924 return; 1925 } 1926 klass->SetVirtualMethods(virtuals); 1927 } 1928 size_t class_def_method_index = 0; 1929 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1930 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1931 if (UNLIKELY(method.get() == NULL)) { 1932 CHECK(self->IsExceptionPending()); // OOME. 1933 return; 1934 } 1935 klass->SetDirectMethod(i, method.get()); 1936 if (oat_class.get() != NULL) { 1937 LinkCode(method, oat_class.get(), class_def_method_index); 1938 } 1939 method->SetMethodIndex(class_def_method_index); 1940 class_def_method_index++; 1941 } 1942 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1943 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1944 if (UNLIKELY(method.get() == NULL)) { 1945 CHECK(self->IsExceptionPending()); // OOME. 1946 return; 1947 } 1948 klass->SetVirtualMethod(i, method.get()); 1949 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1950 if (oat_class.get() != NULL) { 1951 LinkCode(method, oat_class.get(), class_def_method_index); 1952 } 1953 class_def_method_index++; 1954 } 1955 DCHECK(!it.HasNext()); 1956} 1957 1958void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1959 const SirtRef<mirror::Class>& klass, 1960 const SirtRef<mirror::ArtField>& dst) { 1961 uint32_t field_idx = it.GetMemberIndex(); 1962 dst->SetDexFieldIndex(field_idx); 1963 dst->SetDeclaringClass(klass.get()); 1964 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1965} 1966 1967mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1968 const ClassDataItemIterator& it, 1969 const SirtRef<mirror::Class>& klass) { 1970 uint32_t dex_method_idx = it.GetMemberIndex(); 1971 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1972 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 1973 1974 mirror::ArtMethod* dst = AllocArtMethod(self); 1975 if (UNLIKELY(dst == NULL)) { 1976 CHECK(self->IsExceptionPending()); // OOME. 1977 return NULL; 1978 } 1979 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 1980 1981 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 1982 dst->SetDexMethodIndex(dex_method_idx); 1983 dst->SetDeclaringClass(klass.get()); 1984 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 1985 1986 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 1987 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 1988 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 1989 1990 uint32_t access_flags = it.GetMemberAccessFlags(); 1991 1992 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 1993 // Set finalizable flag on declaring class. 1994 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 1995 // Void return type. 1996 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 1997 klass->SetFinalizable(); 1998 } else { 1999 ClassHelper kh(klass.get()); 2000 const char* klass_descriptor = kh.GetDescriptor(); 2001 // The Enum class declares a "final" finalize() method to prevent subclasses from 2002 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2003 // subclasses, so we exclude it here. 2004 // We also want to avoid setting the flag on Object, where we know that finalize() is 2005 // empty. 2006 if ((strcmp("Ljava/lang/Object;", klass_descriptor) != 0) && 2007 (strcmp("Ljava/lang/Enum;", klass_descriptor) != 0)) { 2008 klass->SetFinalizable(); 2009 } 2010 } 2011 } 2012 } else if (method_name[0] == '<') { 2013 // Fix broken access flags for initializers. Bug 11157540. 2014 bool is_init = (strcmp("<init>", method_name) == 0); 2015 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2016 if (UNLIKELY(!is_init && !is_clinit)) { 2017 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2018 } else { 2019 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2020 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2021 << PrettyDescriptor(klass.get()) << " in dex file " << dex_file.GetLocation(); 2022 access_flags |= kAccConstructor; 2023 } 2024 } 2025 } 2026 dst->SetAccessFlags(access_flags); 2027 2028 self->EndAssertNoThreadSuspension(old_cause); 2029 return dst; 2030} 2031 2032void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2033 Thread* self = Thread::Current(); 2034 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 2035 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2036 AppendToBootClassPath(dex_file, dex_cache); 2037} 2038 2039void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2040 const SirtRef<mirror::DexCache>& dex_cache) { 2041 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 2042 boot_class_path_.push_back(&dex_file); 2043 RegisterDexFile(dex_file, dex_cache); 2044} 2045 2046bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 2047 dex_lock_.AssertSharedHeld(Thread::Current()); 2048 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2049 if (dex_caches_[i]->GetDexFile() == &dex_file) { 2050 return true; 2051 } 2052 } 2053 return false; 2054} 2055 2056bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 2057 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2058 return IsDexFileRegisteredLocked(dex_file); 2059} 2060 2061void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2062 const SirtRef<mirror::DexCache>& dex_cache) { 2063 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2064 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 2065 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2066 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2067 dex_caches_.push_back(dex_cache.get()); 2068 dex_cache->SetDexFile(&dex_file); 2069 if (log_new_dex_caches_roots_) { 2070 // TODO: This is not safe if we can remove dex caches. 2071 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2072 } 2073} 2074 2075void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2076 Thread* self = Thread::Current(); 2077 { 2078 ReaderMutexLock mu(self, dex_lock_); 2079 if (IsDexFileRegisteredLocked(dex_file)) { 2080 return; 2081 } 2082 } 2083 // Don't alloc while holding the lock, since allocation may need to 2084 // suspend all threads and another thread may need the dex_lock_ to 2085 // get to a suspend point. 2086 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 2087 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2088 { 2089 WriterMutexLock mu(self, dex_lock_); 2090 if (IsDexFileRegisteredLocked(dex_file)) { 2091 return; 2092 } 2093 RegisterDexFileLocked(dex_file, dex_cache); 2094 } 2095} 2096 2097void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2098 const SirtRef<mirror::DexCache>& dex_cache) { 2099 WriterMutexLock mu(Thread::Current(), dex_lock_); 2100 RegisterDexFileLocked(dex_file, dex_cache); 2101} 2102 2103mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 2104 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2105 // Search assuming unique-ness of dex file. 2106 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2107 mirror::DexCache* dex_cache = dex_caches_[i]; 2108 if (dex_cache->GetDexFile() == &dex_file) { 2109 return dex_cache; 2110 } 2111 } 2112 // Search matching by location name. 2113 std::string location(dex_file.GetLocation()); 2114 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2115 mirror::DexCache* dex_cache = dex_caches_[i]; 2116 if (dex_cache->GetDexFile()->GetLocation() == location) { 2117 return dex_cache; 2118 } 2119 } 2120 // Failure, dump diagnostic and abort. 2121 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2122 mirror::DexCache* dex_cache = dex_caches_[i]; 2123 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2124 } 2125 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2126 return NULL; 2127} 2128 2129void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 2130 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2131 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2132 dex_caches_[i]->Fixup(resolution_method); 2133 } 2134} 2135 2136mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2137 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2138 if (UNLIKELY(klass == NULL)) { 2139 return NULL; 2140 } 2141 return InitializePrimitiveClass(klass, type); 2142} 2143 2144mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2145 Primitive::Type type) { 2146 CHECK(primitive_class != NULL); 2147 // Must hold lock on object when initializing. 2148 Thread* self = Thread::Current(); 2149 SirtRef<mirror::Class> sirt_class(self, primitive_class); 2150 ObjectLock<mirror::Class> lock(self, &sirt_class); 2151 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2152 primitive_class->SetPrimitiveType(type); 2153 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2154 const char* descriptor = Primitive::Descriptor(type); 2155 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2156 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2157 return primitive_class; 2158} 2159 2160// Create an array class (i.e. the class object for the array, not the 2161// array itself). "descriptor" looks like "[C" or "[[[[B" or 2162// "[Ljava/lang/String;". 2163// 2164// If "descriptor" refers to an array of primitives, look up the 2165// primitive type's internally-generated class object. 2166// 2167// "class_loader" is the class loader of the class that's referring to 2168// us. It's used to ensure that we're looking for the element type in 2169// the right context. It does NOT become the class loader for the 2170// array class; that always comes from the base element class. 2171// 2172// Returns NULL with an exception raised on failure. 2173mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2174 const SirtRef<mirror::ClassLoader>& class_loader) { 2175 // Identify the underlying component type 2176 CHECK_EQ('[', descriptor[0]); 2177 SirtRef<mirror::Class> component_type(self, FindClass(self, descriptor + 1, class_loader)); 2178 if (component_type.get() == nullptr) { 2179 DCHECK(self->IsExceptionPending()); 2180 return nullptr; 2181 } 2182 2183 // See if the component type is already loaded. Array classes are 2184 // always associated with the class loader of their underlying 2185 // element type -- an array of Strings goes with the loader for 2186 // java/lang/String -- so we need to look for it there. (The 2187 // caller should have checked for the existence of the class 2188 // before calling here, but they did so with *their* class loader, 2189 // not the component type's loader.) 2190 // 2191 // If we find it, the caller adds "loader" to the class' initiating 2192 // loader list, which should prevent us from going through this again. 2193 // 2194 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2195 // are the same, because our caller (FindClass) just did the 2196 // lookup. (Even if we get this wrong we still have correct behavior, 2197 // because we effectively do this lookup again when we add the new 2198 // class to the hash table --- necessary because of possible races with 2199 // other threads.) 2200 if (class_loader.get() != component_type->GetClassLoader()) { 2201 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2202 if (new_class != NULL) { 2203 return new_class; 2204 } 2205 } 2206 2207 // Fill out the fields in the Class. 2208 // 2209 // It is possible to execute some methods against arrays, because 2210 // all arrays are subclasses of java_lang_Object_, so we need to set 2211 // up a vtable. We can just point at the one in java_lang_Object_. 2212 // 2213 // Array classes are simple enough that we don't need to do a full 2214 // link step. 2215 SirtRef<mirror::Class> new_class(self, NULL); 2216 if (UNLIKELY(!init_done_)) { 2217 // Classes that were hand created, ie not by FindSystemClass 2218 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2219 new_class.reset(GetClassRoot(kClassArrayClass)); 2220 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2221 new_class.reset(GetClassRoot(kObjectArrayClass)); 2222 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2223 new_class.reset(GetClassRoot(kJavaLangStringArrayClass)); 2224 } else if (strcmp(descriptor, 2225 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2226 new_class.reset(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2227 } else if (strcmp(descriptor, 2228 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2229 new_class.reset(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2230 } else if (strcmp(descriptor, "[C") == 0) { 2231 new_class.reset(GetClassRoot(kCharArrayClass)); 2232 } else if (strcmp(descriptor, "[I") == 0) { 2233 new_class.reset(GetClassRoot(kIntArrayClass)); 2234 } 2235 } 2236 if (new_class.get() == nullptr) { 2237 new_class.reset(AllocClass(self, sizeof(mirror::Class))); 2238 if (new_class.get() == nullptr) { 2239 return nullptr; 2240 } 2241 new_class->SetComponentType(component_type.get()); 2242 } 2243 ObjectLock<mirror::Class> lock(self, &new_class); // Must hold lock on object when initializing. 2244 DCHECK(new_class->GetComponentType() != NULL); 2245 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2246 new_class->SetSuperClass(java_lang_Object); 2247 new_class->SetVTable(java_lang_Object->GetVTable()); 2248 new_class->SetPrimitiveType(Primitive::kPrimNot); 2249 new_class->SetClassLoader(component_type->GetClassLoader()); 2250 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2251 // don't need to set new_class->SetObjectSize(..) 2252 // because Object::SizeOf delegates to Array::SizeOf 2253 2254 2255 // All arrays have java/lang/Cloneable and java/io/Serializable as 2256 // interfaces. We need to set that up here, so that stuff like 2257 // "instanceof" works right. 2258 // 2259 // Note: The GC could run during the call to FindSystemClass, 2260 // so we need to make sure the class object is GC-valid while we're in 2261 // there. Do this by clearing the interface list so the GC will just 2262 // think that the entries are null. 2263 2264 2265 // Use the single, global copies of "interfaces" and "iftable" 2266 // (remember not to free them for arrays). 2267 CHECK(array_iftable_ != nullptr); 2268 new_class->SetIfTable(array_iftable_); 2269 2270 // Inherit access flags from the component type. 2271 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2272 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2273 access_flags &= kAccJavaFlagsMask; 2274 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2275 // and remove "interface". 2276 access_flags |= kAccAbstract | kAccFinal; 2277 access_flags &= ~kAccInterface; 2278 2279 new_class->SetAccessFlags(access_flags); 2280 2281 mirror::Class* existing = InsertClass(descriptor, new_class.get(), Hash(descriptor)); 2282 if (existing == nullptr) { 2283 return new_class.get(); 2284 } 2285 // Another thread must have loaded the class after we 2286 // started but before we finished. Abandon what we've 2287 // done. 2288 // 2289 // (Yes, this happens.) 2290 2291 return existing; 2292} 2293 2294mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2295 switch (Primitive::GetType(type)) { 2296 case Primitive::kPrimByte: 2297 return GetClassRoot(kPrimitiveByte); 2298 case Primitive::kPrimChar: 2299 return GetClassRoot(kPrimitiveChar); 2300 case Primitive::kPrimDouble: 2301 return GetClassRoot(kPrimitiveDouble); 2302 case Primitive::kPrimFloat: 2303 return GetClassRoot(kPrimitiveFloat); 2304 case Primitive::kPrimInt: 2305 return GetClassRoot(kPrimitiveInt); 2306 case Primitive::kPrimLong: 2307 return GetClassRoot(kPrimitiveLong); 2308 case Primitive::kPrimShort: 2309 return GetClassRoot(kPrimitiveShort); 2310 case Primitive::kPrimBoolean: 2311 return GetClassRoot(kPrimitiveBoolean); 2312 case Primitive::kPrimVoid: 2313 return GetClassRoot(kPrimitiveVoid); 2314 case Primitive::kPrimNot: 2315 break; 2316 } 2317 std::string printable_type(PrintableChar(type)); 2318 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2319 return NULL; 2320} 2321 2322mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2323 size_t hash) { 2324 if (VLOG_IS_ON(class_linker)) { 2325 mirror::DexCache* dex_cache = klass->GetDexCache(); 2326 std::string source; 2327 if (dex_cache != NULL) { 2328 source += " from "; 2329 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2330 } 2331 LOG(INFO) << "Loaded class " << descriptor << source; 2332 } 2333 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2334 mirror::Class* existing = 2335 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2336 if (existing != NULL) { 2337 return existing; 2338 } 2339 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2340 // Check a class loaded with the system class loader matches one in the image if the class 2341 // is in the image. 2342 existing = LookupClassFromImage(descriptor); 2343 if (existing != NULL) { 2344 CHECK(klass == existing); 2345 } 2346 } 2347 VerifyObject(klass); 2348 class_table_.insert(std::make_pair(hash, klass)); 2349 if (log_new_class_table_roots_) { 2350 new_class_roots_.push_back(std::make_pair(hash, klass)); 2351 } 2352 return NULL; 2353} 2354 2355bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2356 size_t hash = Hash(descriptor); 2357 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2358 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2359 ++it) { 2360 mirror::Class* klass = it->second; 2361 ClassHelper kh(klass); 2362 if ((klass->GetClassLoader() == class_loader) && 2363 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2364 class_table_.erase(it); 2365 return true; 2366 } 2367 } 2368 return false; 2369} 2370 2371mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2372 const mirror::ClassLoader* class_loader) { 2373 size_t hash = Hash(descriptor); 2374 { 2375 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2376 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2377 if (result != NULL) { 2378 return result; 2379 } 2380 } 2381 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2382 return NULL; 2383 } else { 2384 // Lookup failed but need to search dex_caches_. 2385 mirror::Class* result = LookupClassFromImage(descriptor); 2386 if (result != NULL) { 2387 InsertClass(descriptor, result, hash); 2388 } else { 2389 // Searching the image dex files/caches failed, we don't want to get into this situation 2390 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2391 // classes into the class table. 2392 const int32_t kMaxFailedDexCacheLookups = 1000; 2393 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2394 MoveImageClassesToClassTable(); 2395 } 2396 } 2397 return result; 2398 } 2399} 2400 2401mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2402 const mirror::ClassLoader* class_loader, 2403 size_t hash) { 2404 auto end = class_table_.end(); 2405 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2406 mirror::Class* klass = it->second; 2407 ClassHelper kh(klass); 2408 if ((klass->GetClassLoader() == class_loader) && 2409 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2410 if (kIsDebugBuild) { 2411 // Check for duplicates in the table. 2412 for (++it; it != end && it->first == hash; ++it) { 2413 mirror::Class* klass2 = it->second; 2414 ClassHelper kh(klass2); 2415 CHECK(!((klass2->GetClassLoader() == class_loader) && 2416 (strcmp(descriptor, kh.GetDescriptor()) == 0))) 2417 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2418 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2419 } 2420 } 2421 return klass; 2422 } 2423 } 2424 return NULL; 2425} 2426 2427static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2428 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2429 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2430 CHECK(image != NULL); 2431 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2432 return root->AsObjectArray<mirror::DexCache>(); 2433} 2434 2435void ClassLinker::MoveImageClassesToClassTable() { 2436 Thread* self = Thread::Current(); 2437 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2438 if (!dex_cache_image_class_lookup_required_) { 2439 return; // All dex cache classes are already in the class table. 2440 } 2441 const char* old_no_suspend_cause = 2442 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2443 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2444 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2445 mirror::DexCache* dex_cache = dex_caches->Get(i); 2446 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2447 for (int32_t j = 0; j < types->GetLength(); j++) { 2448 mirror::Class* klass = types->Get(j); 2449 if (klass != NULL) { 2450 ClassHelper kh(klass); 2451 DCHECK(klass->GetClassLoader() == NULL); 2452 const char* descriptor = kh.GetDescriptor(); 2453 size_t hash = Hash(descriptor); 2454 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 2455 if (existing != NULL) { 2456 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2457 << PrettyClassAndClassLoader(klass); 2458 } else { 2459 class_table_.insert(std::make_pair(hash, klass)); 2460 if (log_new_class_table_roots_) { 2461 new_class_roots_.push_back(std::make_pair(hash, klass)); 2462 } 2463 } 2464 } 2465 } 2466 } 2467 dex_cache_image_class_lookup_required_ = false; 2468 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2469} 2470 2471mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2472 Thread* self = Thread::Current(); 2473 const char* old_no_suspend_cause = 2474 self->StartAssertNoThreadSuspension("Image class lookup"); 2475 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2476 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2477 mirror::DexCache* dex_cache = dex_caches->Get(i); 2478 const DexFile* dex_file = dex_cache->GetDexFile(); 2479 // Try binary searching the string/type index. 2480 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2481 if (string_id != NULL) { 2482 const DexFile::TypeId* type_id = 2483 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2484 if (type_id != NULL) { 2485 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2486 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2487 if (klass != NULL) { 2488 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2489 return klass; 2490 } 2491 } 2492 } 2493 } 2494 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2495 return NULL; 2496} 2497 2498void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2499 result.clear(); 2500 if (dex_cache_image_class_lookup_required_) { 2501 MoveImageClassesToClassTable(); 2502 } 2503 size_t hash = Hash(descriptor); 2504 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2505 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2506 it != end && it->first == hash; ++it) { 2507 mirror::Class* klass = it->second; 2508 ClassHelper kh(klass); 2509 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2510 result.push_back(klass); 2511 } 2512 } 2513} 2514 2515void ClassLinker::VerifyClass(const SirtRef<mirror::Class>& klass) { 2516 // TODO: assert that the monitor on the Class is held 2517 Thread* self = Thread::Current(); 2518 ObjectLock<mirror::Class> lock(self, &klass); 2519 2520 // Don't attempt to re-verify if already sufficiently verified. 2521 if (klass->IsVerified() || 2522 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2523 return; 2524 } 2525 2526 // The class might already be erroneous, for example at compile time if we attempted to verify 2527 // this class as a parent to another. 2528 if (klass->IsErroneous()) { 2529 ThrowEarlierClassFailure(klass.get()); 2530 return; 2531 } 2532 2533 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2534 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2535 } else { 2536 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2537 << PrettyClass(klass.get()); 2538 CHECK(!Runtime::Current()->IsCompiler()); 2539 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2540 } 2541 2542 // Verify super class. 2543 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 2544 if (super.get() != NULL) { 2545 // Acquire lock to prevent races on verifying the super class. 2546 ObjectLock<mirror::Class> lock(self, &super); 2547 2548 if (!super->IsVerified() && !super->IsErroneous()) { 2549 VerifyClass(super); 2550 } 2551 if (!super->IsCompileTimeVerified()) { 2552 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2553 PrettyDescriptor(klass.get()).c_str(), 2554 PrettyDescriptor(super.get()).c_str())); 2555 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2556 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 2557 if (cause.get() != nullptr) { 2558 self->ClearException(); 2559 } 2560 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2561 if (cause.get() != nullptr) { 2562 self->GetException(nullptr)->SetCause(cause.get()); 2563 } 2564 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2565 if (Runtime::Current()->IsCompiler()) { 2566 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2567 } 2568 klass->SetStatus(mirror::Class::kStatusError, self); 2569 return; 2570 } 2571 } 2572 2573 // Try to use verification information from the oat file, otherwise do runtime verification. 2574 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2575 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2576 bool preverified = VerifyClassUsingOatFile(dex_file, klass.get(), oat_file_class_status); 2577 if (oat_file_class_status == mirror::Class::kStatusError) { 2578 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2579 << PrettyDescriptor(klass.get()) << " in " 2580 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2581 ThrowVerifyError(klass.get(), "Rejecting class %s because it failed compile-time verification", 2582 PrettyDescriptor(klass.get()).c_str()); 2583 klass->SetStatus(mirror::Class::kStatusError, self); 2584 return; 2585 } 2586 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2587 std::string error_msg; 2588 if (!preverified) { 2589 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.get(), 2590 Runtime::Current()->IsCompiler(), 2591 &error_msg); 2592 } 2593 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2594 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2595 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.get()) 2596 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2597 << " because: " << error_msg; 2598 } 2599 self->AssertNoPendingException(); 2600 // Make sure all classes referenced by catch blocks are resolved. 2601 ResolveClassExceptionHandlerTypes(dex_file, klass); 2602 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2603 // Even though there were no verifier failures we need to respect whether the super-class 2604 // was verified or requiring runtime reverification. 2605 if (super.get() == NULL || super->IsVerified()) { 2606 klass->SetStatus(mirror::Class::kStatusVerified, self); 2607 } else { 2608 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2609 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2610 // Pretend a soft failure occured so that we don't consider the class verified below. 2611 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2612 } 2613 } else { 2614 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2615 // Soft failures at compile time should be retried at runtime. Soft 2616 // failures at runtime will be handled by slow paths in the generated 2617 // code. Set status accordingly. 2618 if (Runtime::Current()->IsCompiler()) { 2619 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2620 } else { 2621 klass->SetStatus(mirror::Class::kStatusVerified, self); 2622 } 2623 } 2624 } else { 2625 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.get()) 2626 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2627 << " because: " << error_msg; 2628 self->AssertNoPendingException(); 2629 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2630 klass->SetStatus(mirror::Class::kStatusError, self); 2631 } 2632 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2633 // Class is verified so we don't need to do any access check on its methods. 2634 // Let the interpreter know it by setting the kAccPreverified flag onto each 2635 // method. 2636 // Note: we're going here during compilation and at runtime. When we set the 2637 // kAccPreverified flag when compiling image classes, the flag is recorded 2638 // in the image and is set when loading the image. 2639 klass->SetPreverifiedFlagOnAllMethods(); 2640 } 2641} 2642 2643bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2644 mirror::Class::Status& oat_file_class_status) { 2645 // If we're compiling, we can only verify the class using the oat file if 2646 // we are not compiling the image or if the class we're verifying is not part of 2647 // the app. In other words, we will only check for preverification of bootclasspath 2648 // classes. 2649 if (Runtime::Current()->IsCompiler()) { 2650 // Are we compiling the bootclasspath? 2651 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2652 return false; 2653 } 2654 // We are compiling an app (not the image). 2655 2656 // Is this an app class? (I.e. not a bootclasspath class) 2657 if (klass->GetClassLoader() != NULL) { 2658 return false; 2659 } 2660 } 2661 2662 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2663 // Make this work with gtests, which do not set up the image properly. 2664 // TODO: we should clean up gtests to set up the image path properly. 2665 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2666 return false; 2667 } 2668 2669 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2670 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2671 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2672 &dex_location_checksum); 2673 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2674 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2675 UniquePtr<const OatFile::OatClass> oat_class(oat_dex_file->GetOatClass(class_def_index)); 2676 CHECK(oat_class.get() != NULL) 2677 << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2678 << ClassHelper(klass).GetDescriptor(); 2679 oat_file_class_status = oat_class->GetStatus(); 2680 if (oat_file_class_status == mirror::Class::kStatusVerified || 2681 oat_file_class_status == mirror::Class::kStatusInitialized) { 2682 return true; 2683 } 2684 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2685 // Compile time verification failed with a soft error. Compile time verification can fail 2686 // because we have incomplete type information. Consider the following: 2687 // class ... { 2688 // Foo x; 2689 // .... () { 2690 // if (...) { 2691 // v1 gets assigned a type of resolved class Foo 2692 // } else { 2693 // v1 gets assigned a type of unresolved class Bar 2694 // } 2695 // iput x = v1 2696 // } } 2697 // when we merge v1 following the if-the-else it results in Conflict 2698 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2699 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2700 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2701 // at compile time). 2702 return false; 2703 } 2704 if (oat_file_class_status == mirror::Class::kStatusError) { 2705 // Compile time verification failed with a hard error. This is caused by invalid instructions 2706 // in the class. These errors are unrecoverable. 2707 return false; 2708 } 2709 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2710 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2711 // not loading the class. 2712 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2713 // isn't a problem and this case shouldn't occur 2714 return false; 2715 } 2716 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2717 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2718 << ClassHelper(klass).GetDescriptor(); 2719 2720 return false; 2721} 2722 2723void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2724 const SirtRef<mirror::Class>& klass) { 2725 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2726 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2727 } 2728 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2729 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2730 } 2731} 2732 2733void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2734 mirror::ArtMethod* method) { 2735 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2736 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2737 if (code_item == NULL) { 2738 return; // native or abstract method 2739 } 2740 if (code_item->tries_size_ == 0) { 2741 return; // nothing to process 2742 } 2743 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2744 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2745 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2746 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2747 CatchHandlerIterator iterator(handlers_ptr); 2748 for (; iterator.HasNext(); iterator.Next()) { 2749 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2750 // unresolved exception types will be ignored by exception delivery 2751 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2752 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2753 if (exception_type == NULL) { 2754 DCHECK(Thread::Current()->IsExceptionPending()); 2755 Thread::Current()->ClearException(); 2756 } 2757 } 2758 } 2759 handlers_ptr = iterator.EndDataPointer(); 2760 } 2761} 2762 2763static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2764static void CheckProxyMethod(mirror::ArtMethod* method, 2765 SirtRef<mirror::ArtMethod>& prototype); 2766 2767mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccess& soa, jstring name, 2768 jobjectArray interfaces, jobject loader, 2769 jobjectArray methods, jobjectArray throws) { 2770 Thread* self = soa.Self(); 2771 SirtRef<mirror::Class> klass(self, AllocClass(self, GetClassRoot(kJavaLangClass), 2772 sizeof(mirror::SynthesizedProxyClass))); 2773 if (klass.get() == NULL) { 2774 CHECK(self->IsExceptionPending()); // OOME. 2775 return NULL; 2776 } 2777 DCHECK(klass->GetClass() != NULL); 2778 klass->SetObjectSize(sizeof(mirror::Proxy)); 2779 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2780 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2781 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2782 klass->SetName(soa.Decode<mirror::String*>(name)); 2783 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2784 klass->SetDexCache(proxy_class->GetDexCache()); 2785 klass->SetStatus(mirror::Class::kStatusIdx, self); 2786 2787 // Instance fields are inherited, but we add a couple of static fields... 2788 { 2789 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2790 if (UNLIKELY(sfields == NULL)) { 2791 CHECK(self->IsExceptionPending()); // OOME. 2792 return NULL; 2793 } 2794 klass->SetSFields(sfields); 2795 } 2796 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2797 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2798 SirtRef<mirror::ArtField> interfaces_sfield(self, AllocArtField(self)); 2799 if (UNLIKELY(interfaces_sfield.get() == NULL)) { 2800 CHECK(self->IsExceptionPending()); // OOME. 2801 return NULL; 2802 } 2803 klass->SetStaticField(0, interfaces_sfield.get()); 2804 interfaces_sfield->SetDexFieldIndex(0); 2805 interfaces_sfield->SetDeclaringClass(klass.get()); 2806 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2807 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2808 SirtRef<mirror::ArtField> throws_sfield(self, AllocArtField(self)); 2809 if (UNLIKELY(throws_sfield.get() == NULL)) { 2810 CHECK(self->IsExceptionPending()); // OOME. 2811 return NULL; 2812 } 2813 klass->SetStaticField(1, throws_sfield.get()); 2814 throws_sfield->SetDexFieldIndex(1); 2815 throws_sfield->SetDeclaringClass(klass.get()); 2816 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2817 2818 // Proxies have 1 direct method, the constructor 2819 { 2820 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 2821 if (UNLIKELY(directs == NULL)) { 2822 CHECK(self->IsExceptionPending()); // OOME. 2823 return NULL; 2824 } 2825 klass->SetDirectMethods(directs); 2826 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2827 if (UNLIKELY(constructor == NULL)) { 2828 CHECK(self->IsExceptionPending()); // OOME. 2829 return NULL; 2830 } 2831 klass->SetDirectMethod(0, constructor); 2832 } 2833 2834 // Create virtual method using specified prototypes. 2835 size_t num_virtual_methods = 2836 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 2837 { 2838 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, num_virtual_methods); 2839 if (UNLIKELY(virtuals == NULL)) { 2840 CHECK(self->IsExceptionPending()); // OOME. 2841 return NULL; 2842 } 2843 klass->SetVirtualMethods(virtuals); 2844 } 2845 for (size_t i = 0; i < num_virtual_methods; ++i) { 2846 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2847 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2848 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2849 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2850 if (UNLIKELY(clone == NULL)) { 2851 CHECK(self->IsExceptionPending()); // OOME. 2852 return NULL; 2853 } 2854 klass->SetVirtualMethod(i, clone); 2855 } 2856 2857 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2858 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Class is now effectively in the loaded state 2859 self->AssertNoPendingException(); 2860 2861 { 2862 ObjectLock<mirror::Class> lock(self, &klass); // Must hold lock on object when resolved. 2863 // Link the fields and virtual methods, creating vtable and iftables 2864 SirtRef<mirror::ObjectArray<mirror::Class> > sirt_interfaces( 2865 self, soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2866 if (!LinkClass(self, klass, sirt_interfaces)) { 2867 klass->SetStatus(mirror::Class::kStatusError, self); 2868 return nullptr; 2869 } 2870 2871 interfaces_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2872 throws_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2873 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2874 } 2875 2876 // sanity checks 2877 if (kIsDebugBuild) { 2878 CHECK(klass->GetIFields() == NULL); 2879 CheckProxyConstructor(klass->GetDirectMethod(0)); 2880 for (size_t i = 0; i < num_virtual_methods; ++i) { 2881 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2882 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2883 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2884 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2885 } 2886 2887 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 2888 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2889 decoded_name->ToModifiedUtf8().c_str())); 2890 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2891 2892 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2893 decoded_name->ToModifiedUtf8().c_str())); 2894 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2895 2896 mirror::SynthesizedProxyClass* synth_proxy_class = 2897 down_cast<mirror::SynthesizedProxyClass*>(klass.get()); 2898 CHECK_EQ(synth_proxy_class->GetInterfaces(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2899 CHECK_EQ(synth_proxy_class->GetThrows(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2900 } 2901 std::string descriptor(GetDescriptorForProxy(klass.get())); 2902 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.get(), Hash(descriptor.c_str())); 2903 CHECK(existing == nullptr); 2904 return klass.get(); 2905} 2906 2907std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 2908 DCHECK(proxy_class->IsProxyClass()); 2909 mirror::String* name = proxy_class->GetName(); 2910 DCHECK(name != NULL); 2911 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2912} 2913 2914mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 2915 mirror::ArtMethod* proxy_method) { 2916 DCHECK(proxy_class->IsProxyClass()); 2917 DCHECK(proxy_method->IsProxyMethod()); 2918 // Locate the dex cache of the original interface/Object 2919 mirror::DexCache* dex_cache = NULL; 2920 { 2921 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2922 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2923 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2924 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2925 dex_cache = dex_caches_[i]; 2926 break; 2927 } 2928 } 2929 } 2930 CHECK(dex_cache != NULL); 2931 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2932 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2933 CHECK(resolved_method != NULL); 2934 return resolved_method; 2935} 2936 2937 2938mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2939 const SirtRef<mirror::Class>& klass, 2940 mirror::Class* proxy_class) { 2941 // Create constructor for Proxy that must initialize h 2942 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2943 proxy_class->GetDirectMethods(); 2944 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2945 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2946 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2947 // code_ too) 2948 mirror::ArtMethod* constructor = 2949 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2950 if (constructor == NULL) { 2951 CHECK(self->IsExceptionPending()); // OOME. 2952 return NULL; 2953 } 2954 // Make this constructor public and fix the class to be our Proxy version 2955 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2956 constructor->SetDeclaringClass(klass.get()); 2957 return constructor; 2958} 2959 2960static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2961 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2962 CHECK(constructor->IsConstructor()); 2963 MethodHelper mh(constructor); 2964 CHECK_STREQ(mh.GetName(), "<init>"); 2965 CHECK_STREQ(mh.GetSignature().ToString().c_str(), "(Ljava/lang/reflect/InvocationHandler;)V"); 2966 DCHECK(constructor->IsPublic()); 2967} 2968 2969mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 2970 const SirtRef<mirror::Class>& klass, 2971 const SirtRef<mirror::ArtMethod>& prototype) { 2972 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2973 // prototype method 2974 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2975 prototype.get()); 2976 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2977 // as necessary 2978 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 2979 if (UNLIKELY(method == NULL)) { 2980 CHECK(self->IsExceptionPending()); // OOME. 2981 return NULL; 2982 } 2983 2984 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 2985 // the intersection of throw exceptions as defined in Proxy 2986 method->SetDeclaringClass(klass.get()); 2987 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 2988 2989 // At runtime the method looks like a reference and argument saving method, clone the code 2990 // related parameters from this method. 2991 mirror::ArtMethod* refs_and_args = 2992 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 2993 method->SetCoreSpillMask(refs_and_args->GetCoreSpillMask()); 2994 method->SetFpSpillMask(refs_and_args->GetFpSpillMask()); 2995 method->SetFrameSizeInBytes(refs_and_args->GetFrameSizeInBytes()); 2996 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 2997 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 2998 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2999 3000 return method; 3001} 3002 3003static void CheckProxyMethod(mirror::ArtMethod* method, 3004 SirtRef<mirror::ArtMethod>& prototype) 3005 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3006 // Basic sanity 3007 CHECK(!prototype->IsFinal()); 3008 CHECK(method->IsFinal()); 3009 CHECK(!method->IsAbstract()); 3010 3011 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3012 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3013 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3014 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 3015 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 3016 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3017 3018 MethodHelper mh(method); 3019 MethodHelper mh2(prototype.get()); 3020 CHECK_STREQ(mh.GetName(), mh2.GetName()); 3021 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 3022 // More complex sanity - via dex cache 3023 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3024} 3025 3026static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3027 bool can_init_parents) 3028 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3029 if (can_init_statics && can_init_parents) { 3030 return true; 3031 } 3032 if (!can_init_statics) { 3033 // Check if there's a class initializer. 3034 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3035 if (clinit != NULL) { 3036 return false; 3037 } 3038 // Check if there are encoded static values needing initialization. 3039 if (klass->NumStaticFields() != 0) { 3040 ClassHelper kh(klass); 3041 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3042 DCHECK(dex_class_def != NULL); 3043 if (dex_class_def->static_values_off_ != 0) { 3044 return false; 3045 } 3046 } 3047 } 3048 if (!klass->IsInterface() && klass->HasSuperClass()) { 3049 mirror::Class* super_class = klass->GetSuperClass(); 3050 if (!can_init_parents && !super_class->IsInitialized()) { 3051 return false; 3052 } else { 3053 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3054 return false; 3055 } 3056 } 3057 } 3058 return true; 3059} 3060 3061bool ClassLinker::IsInitialized() const { 3062 return init_done_; 3063} 3064 3065bool ClassLinker::InitializeClass(const SirtRef<mirror::Class>& klass, bool can_init_statics, 3066 bool can_init_parents) { 3067 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3068 3069 // Are we already initialized and therefore done? 3070 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3071 // an initialized class will never change its state. 3072 if (klass->IsInitialized()) { 3073 return true; 3074 } 3075 3076 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3077 if (!CanWeInitializeClass(klass.get(), can_init_statics, can_init_parents)) { 3078 return false; 3079 } 3080 3081 Thread* self = Thread::Current(); 3082 uint64_t t0; 3083 { 3084 ObjectLock<mirror::Class> lock(self, &klass); 3085 3086 // Re-check under the lock in case another thread initialized ahead of us. 3087 if (klass->IsInitialized()) { 3088 return true; 3089 } 3090 3091 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3092 if (klass->IsErroneous()) { 3093 ThrowEarlierClassFailure(klass.get()); 3094 return false; 3095 } 3096 3097 CHECK(klass->IsResolved()) << PrettyClass(klass.get()) << ": state=" << klass->GetStatus(); 3098 3099 if (!klass->IsVerified()) { 3100 VerifyClass(klass); 3101 if (!klass->IsVerified()) { 3102 // We failed to verify, expect either the klass to be erroneous or verification failed at 3103 // compile time. 3104 if (klass->IsErroneous()) { 3105 CHECK(self->IsExceptionPending()); 3106 } else { 3107 CHECK(Runtime::Current()->IsCompiler()); 3108 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3109 } 3110 return false; 3111 } 3112 } 3113 3114 // If the class is kStatusInitializing, either this thread is 3115 // initializing higher up the stack or another thread has beat us 3116 // to initializing and we need to wait. Either way, this 3117 // invocation of InitializeClass will not be responsible for 3118 // running <clinit> and will return. 3119 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3120 // We caught somebody else in the act; was it us? 3121 if (klass->GetClinitThreadId() == self->GetTid()) { 3122 // Yes. That's fine. Return so we can continue initializing. 3123 return true; 3124 } 3125 // No. That's fine. Wait for another thread to finish initializing. 3126 return WaitForInitializeClass(klass, self, lock); 3127 } 3128 3129 if (!ValidateSuperClassDescriptors(klass)) { 3130 klass->SetStatus(mirror::Class::kStatusError, self); 3131 return false; 3132 } 3133 3134 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.get()); 3135 3136 // From here out other threads may observe that we're initializing and so changes of state 3137 // require the a notification. 3138 klass->SetClinitThreadId(self->GetTid()); 3139 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3140 3141 t0 = NanoTime(); 3142 } 3143 3144 // Initialize super classes, must be done while initializing for the JLS. 3145 if (!klass->IsInterface() && klass->HasSuperClass()) { 3146 mirror::Class* super_class = klass->GetSuperClass(); 3147 if (!super_class->IsInitialized()) { 3148 CHECK(!super_class->IsInterface()); 3149 CHECK(can_init_parents); 3150 SirtRef<mirror::Class> sirt_super(self, super_class); 3151 bool super_initialized = InitializeClass(sirt_super, can_init_statics, true); 3152 if (!super_initialized) { 3153 // The super class was verified ahead of entering initializing, we should only be here if 3154 // the super class became erroneous due to initialization. 3155 CHECK(sirt_super->IsErroneous() && self->IsExceptionPending()) 3156 << "Super class initialization failed for " << PrettyDescriptor(sirt_super.get()) 3157 << " that has unexpected status " << sirt_super->GetStatus() 3158 << "\nPending exception:\n" 3159 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3160 ObjectLock<mirror::Class> lock(self, &klass); 3161 // Initialization failed because the super-class is erroneous. 3162 klass->SetStatus(mirror::Class::kStatusError, self); 3163 return false; 3164 } 3165 } 3166 } 3167 3168 if (klass->NumStaticFields() > 0) { 3169 ClassHelper kh(klass.get()); 3170 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3171 CHECK(dex_class_def != NULL); 3172 const DexFile& dex_file = kh.GetDexFile(); 3173 SirtRef<mirror::ClassLoader> class_loader(self, klass->GetClassLoader()); 3174 SirtRef<mirror::DexCache> dex_cache(self, kh.GetDexCache()); 3175 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3176 this, *dex_class_def); 3177 if (it.HasNext()) { 3178 CHECK(can_init_statics); 3179 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 3180 SafeMap<uint32_t, mirror::ArtField*> field_map; 3181 ConstructFieldMap(dex_file, *dex_class_def, klass.get(), field_map); 3182 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3183 if (Runtime::Current()->IsActiveTransaction()) { 3184 it.ReadValueToField<true>(field_map.Get(i)); 3185 } else { 3186 it.ReadValueToField<false>(field_map.Get(i)); 3187 } 3188 } 3189 } 3190 } 3191 3192 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3193 if (clinit != NULL) { 3194 CHECK(can_init_statics); 3195 if (LIKELY(Runtime::Current()->IsStarted())) { 3196 JValue result; 3197 clinit->Invoke(self, NULL, 0, &result, "V"); 3198 } else { 3199 art::interpreter::EnterInterpreterFromInvoke(self, clinit, NULL, NULL, NULL); 3200 } 3201 } 3202 3203 uint64_t t1 = NanoTime(); 3204 3205 bool success = true; 3206 { 3207 ObjectLock<mirror::Class> lock(self, &klass); 3208 3209 if (self->IsExceptionPending()) { 3210 WrapExceptionInInitializer(); 3211 klass->SetStatus(mirror::Class::kStatusError, self); 3212 success = false; 3213 } else { 3214 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3215 RuntimeStats* thread_stats = self->GetStats(); 3216 ++global_stats->class_init_count; 3217 ++thread_stats->class_init_count; 3218 global_stats->class_init_time_ns += (t1 - t0); 3219 thread_stats->class_init_time_ns += (t1 - t0); 3220 // Set the class as initialized except if failed to initialize static fields. 3221 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3222 if (VLOG_IS_ON(class_linker)) { 3223 ClassHelper kh(klass.get()); 3224 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 3225 } 3226 // Opportunistically set static method trampolines to their destination. 3227 FixupStaticTrampolines(klass.get()); 3228 } 3229 } 3230 return success; 3231} 3232 3233bool ClassLinker::WaitForInitializeClass(const SirtRef<mirror::Class>& klass, Thread* self, 3234 ObjectLock<mirror::Class>& lock) 3235 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3236 while (true) { 3237 self->AssertNoPendingException(); 3238 CHECK(!klass->IsInitialized()); 3239 lock.WaitIgnoringInterrupts(); 3240 3241 // When we wake up, repeat the test for init-in-progress. If 3242 // there's an exception pending (only possible if 3243 // "interruptShouldThrow" was set), bail out. 3244 if (self->IsExceptionPending()) { 3245 WrapExceptionInInitializer(); 3246 klass->SetStatus(mirror::Class::kStatusError, self); 3247 return false; 3248 } 3249 // Spurious wakeup? Go back to waiting. 3250 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3251 continue; 3252 } 3253 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3254 // Compile time initialization failed. 3255 return false; 3256 } 3257 if (klass->IsErroneous()) { 3258 // The caller wants an exception, but it was thrown in a 3259 // different thread. Synthesize one here. 3260 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3261 PrettyDescriptor(klass.get()).c_str()); 3262 return false; 3263 } 3264 if (klass->IsInitialized()) { 3265 return true; 3266 } 3267 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.get()) << " is " 3268 << klass->GetStatus(); 3269 } 3270 LOG(FATAL) << "Not Reached" << PrettyClass(klass.get()); 3271} 3272 3273bool ClassLinker::ValidateSuperClassDescriptors(const SirtRef<mirror::Class>& klass) { 3274 if (klass->IsInterface()) { 3275 return true; 3276 } 3277 Thread* self = Thread::Current(); 3278 // begin with the methods local to the superclass 3279 if (klass->HasSuperClass() && 3280 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3281 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 3282 for (int i = super->GetVTable()->GetLength() - 1; i >= 0; --i) { 3283 mirror::ArtMethod* method = klass->GetVTable()->Get(i); 3284 if (method != super->GetVTable()->Get(i) && 3285 !IsSameMethodSignatureInDifferentClassContexts(self, method, super.get(), klass.get())) { 3286 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in superclass %s", 3287 PrettyDescriptor(klass.get()).c_str(), PrettyMethod(method).c_str(), 3288 PrettyDescriptor(super.get()).c_str()); 3289 return false; 3290 } 3291 } 3292 } 3293 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3294 SirtRef<mirror::Class> interface(self, klass->GetIfTable()->GetInterface(i)); 3295 if (klass->GetClassLoader() != interface->GetClassLoader()) { 3296 for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { 3297 mirror::ArtMethod* method = klass->GetIfTable()->GetMethodArray(i)->Get(j); 3298 if (!IsSameMethodSignatureInDifferentClassContexts(self, method, interface.get(), 3299 method->GetDeclaringClass())) { 3300 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in interface %s", 3301 PrettyDescriptor(method->GetDeclaringClass()).c_str(), 3302 PrettyMethod(method).c_str(), 3303 PrettyDescriptor(interface.get()).c_str()); 3304 return false; 3305 } 3306 } 3307 } 3308 } 3309 return true; 3310} 3311 3312// Returns true if classes referenced by the signature of the method are the 3313// same classes in klass1 as they are in klass2. 3314bool ClassLinker::IsSameMethodSignatureInDifferentClassContexts(Thread* self, 3315 mirror::ArtMethod* method, 3316 mirror::Class* klass1, 3317 mirror::Class* klass2) { 3318 if (klass1 == klass2) { 3319 return true; 3320 } 3321 CHECK(klass1 != nullptr); 3322 CHECK(klass2 != nullptr); 3323 SirtRef<mirror::ClassLoader> loader1(self, klass1->GetClassLoader()); 3324 SirtRef<mirror::ClassLoader> loader2(self, klass2->GetClassLoader()); 3325 const DexFile& dex_file = *method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 3326 const DexFile::ProtoId& proto_id = 3327 dex_file.GetMethodPrototype(dex_file.GetMethodId(method->GetDexMethodIndex())); 3328 for (DexFileParameterIterator it(dex_file, proto_id); it.HasNext(); it.Next()) { 3329 const char* descriptor = it.GetDescriptor(); 3330 if (descriptor == nullptr) { 3331 break; 3332 } 3333 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3334 // Found a non-primitive type. 3335 if (!IsSameDescriptorInDifferentClassContexts(self, descriptor, loader1, loader2)) { 3336 return false; 3337 } 3338 } 3339 } 3340 // Check the return type 3341 const char* descriptor = dex_file.GetReturnTypeDescriptor(proto_id); 3342 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3343 if (!IsSameDescriptorInDifferentClassContexts(self, descriptor, loader1, loader2)) { 3344 return false; 3345 } 3346 } 3347 return true; 3348} 3349 3350// Returns true if the descriptor resolves to the same class in the context of loader1 and loader2. 3351bool ClassLinker::IsSameDescriptorInDifferentClassContexts(Thread* self, const char* descriptor, 3352 SirtRef<mirror::ClassLoader>& loader1, 3353 SirtRef<mirror::ClassLoader>& loader2) { 3354 CHECK(descriptor != nullptr); 3355 SirtRef<mirror::Class> found1(self, FindClass(self, descriptor, loader1)); 3356 if (found1.get() == nullptr) { 3357 self->ClearException(); 3358 } 3359 mirror::Class* found2 = FindClass(self, descriptor, loader2); 3360 if (found2 == nullptr) { 3361 self->ClearException(); 3362 } 3363 return found1.get() == found2; 3364} 3365 3366bool ClassLinker::EnsureInitialized(const SirtRef<mirror::Class>& c, bool can_init_fields, 3367 bool can_init_parents) { 3368 DCHECK(c.get() != NULL); 3369 if (c->IsInitialized()) { 3370 return true; 3371 } 3372 3373 bool success = InitializeClass(c, can_init_fields, can_init_parents); 3374 if (!success) { 3375 if (can_init_fields && can_init_parents) { 3376 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.get()); 3377 } 3378 } 3379 return success; 3380} 3381 3382void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3383 mirror::Class* c, 3384 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3385 const byte* class_data = dex_file.GetClassData(dex_class_def); 3386 ClassDataItemIterator it(dex_file, class_data); 3387 Thread* self = Thread::Current(); 3388 SirtRef<mirror::DexCache> dex_cache(self, c->GetDexCache()); 3389 SirtRef<mirror::ClassLoader> class_loader(self, c->GetClassLoader()); 3390 CHECK(!kMovingFields); 3391 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3392 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3393 } 3394} 3395 3396bool ClassLinker::LinkClass(Thread* self, const SirtRef<mirror::Class>& klass, 3397 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3398 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3399 if (!LinkSuperClass(klass)) { 3400 return false; 3401 } 3402 if (!LinkMethods(klass, interfaces)) { 3403 return false; 3404 } 3405 if (!LinkInstanceFields(klass)) { 3406 return false; 3407 } 3408 if (!LinkStaticFields(klass)) { 3409 return false; 3410 } 3411 CreateReferenceInstanceOffsets(klass); 3412 CreateReferenceStaticOffsets(klass); 3413 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3414 klass->SetStatus(mirror::Class::kStatusResolved, self); 3415 return true; 3416} 3417 3418bool ClassLinker::LoadSuperAndInterfaces(const SirtRef<mirror::Class>& klass, 3419 const DexFile& dex_file) { 3420 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3421 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3422 uint16_t super_class_idx = class_def.superclass_idx_; 3423 if (super_class_idx != DexFile::kDexNoIndex16) { 3424 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.get()); 3425 if (super_class == NULL) { 3426 DCHECK(Thread::Current()->IsExceptionPending()); 3427 return false; 3428 } 3429 // Verify 3430 if (!klass->CanAccess(super_class)) { 3431 ThrowIllegalAccessError(klass.get(), "Class %s extended by class %s is inaccessible", 3432 PrettyDescriptor(super_class).c_str(), 3433 PrettyDescriptor(klass.get()).c_str()); 3434 return false; 3435 } 3436 klass->SetSuperClass(super_class); 3437 } 3438 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3439 if (interfaces != NULL) { 3440 for (size_t i = 0; i < interfaces->Size(); i++) { 3441 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3442 mirror::Class* interface = ResolveType(dex_file, idx, klass.get()); 3443 if (interface == NULL) { 3444 DCHECK(Thread::Current()->IsExceptionPending()); 3445 return false; 3446 } 3447 // Verify 3448 if (!klass->CanAccess(interface)) { 3449 // TODO: the RI seemed to ignore this in my testing. 3450 ThrowIllegalAccessError(klass.get(), "Interface %s implemented by class %s is inaccessible", 3451 PrettyDescriptor(interface).c_str(), 3452 PrettyDescriptor(klass.get()).c_str()); 3453 return false; 3454 } 3455 } 3456 } 3457 // Mark the class as loaded. 3458 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3459 return true; 3460} 3461 3462bool ClassLinker::LinkSuperClass(const SirtRef<mirror::Class>& klass) { 3463 CHECK(!klass->IsPrimitive()); 3464 mirror::Class* super = klass->GetSuperClass(); 3465 if (klass.get() == GetClassRoot(kJavaLangObject)) { 3466 if (super != NULL) { 3467 ThrowClassFormatError(klass.get(), "java.lang.Object must not have a superclass"); 3468 return false; 3469 } 3470 return true; 3471 } 3472 if (super == NULL) { 3473 ThrowLinkageError(klass.get(), "No superclass defined for class %s", 3474 PrettyDescriptor(klass.get()).c_str()); 3475 return false; 3476 } 3477 // Verify 3478 if (super->IsFinal() || super->IsInterface()) { 3479 ThrowIncompatibleClassChangeError(klass.get(), "Superclass %s of %s is %s", 3480 PrettyDescriptor(super).c_str(), 3481 PrettyDescriptor(klass.get()).c_str(), 3482 super->IsFinal() ? "declared final" : "an interface"); 3483 return false; 3484 } 3485 if (!klass->CanAccess(super)) { 3486 ThrowIllegalAccessError(klass.get(), "Superclass %s is inaccessible to class %s", 3487 PrettyDescriptor(super).c_str(), 3488 PrettyDescriptor(klass.get()).c_str()); 3489 return false; 3490 } 3491 3492 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3493 if (super->IsFinalizable()) { 3494 klass->SetFinalizable(); 3495 } 3496 3497 // Inherit reference flags (if any) from the superclass. 3498 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3499 if (reference_flags != 0) { 3500 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3501 } 3502 // Disallow custom direct subclasses of java.lang.ref.Reference. 3503 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3504 ThrowLinkageError(klass.get(), 3505 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3506 PrettyDescriptor(klass.get()).c_str()); 3507 return false; 3508 } 3509 3510 if (kIsDebugBuild) { 3511 // Ensure super classes are fully resolved prior to resolving fields.. 3512 while (super != NULL) { 3513 CHECK(super->IsResolved()); 3514 super = super->GetSuperClass(); 3515 } 3516 } 3517 return true; 3518} 3519 3520// Populate the class vtable and itable. Compute return type indices. 3521bool ClassLinker::LinkMethods(const SirtRef<mirror::Class>& klass, 3522 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3523 if (klass->IsInterface()) { 3524 // No vtable. 3525 size_t count = klass->NumVirtualMethods(); 3526 if (!IsUint(16, count)) { 3527 ThrowClassFormatError(klass.get(), "Too many methods on interface: %zd", count); 3528 return false; 3529 } 3530 for (size_t i = 0; i < count; ++i) { 3531 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3532 } 3533 // Link interface method tables 3534 return LinkInterfaceMethods(klass, interfaces); 3535 } else { 3536 // Link virtual and interface method tables 3537 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3538 } 3539 return true; 3540} 3541 3542bool ClassLinker::LinkVirtualMethods(const SirtRef<mirror::Class>& klass) { 3543 Thread* self = Thread::Current(); 3544 if (klass->HasSuperClass()) { 3545 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3546 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3547 CHECK_LE(actual_count, max_count); 3548 // TODO: do not assign to the vtable field until it is fully constructed. 3549 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3550 vtable(self, klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count)); 3551 if (UNLIKELY(vtable.get() == NULL)) { 3552 CHECK(self->IsExceptionPending()); // OOME. 3553 return false; 3554 } 3555 // See if any of our virtual methods override the superclass. 3556 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3557 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3558 MethodHelper local_mh(local_method); 3559 size_t j = 0; 3560 for (; j < actual_count; ++j) { 3561 mirror::ArtMethod* super_method = vtable->Get(j); 3562 MethodHelper super_mh(super_method); 3563 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3564 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3565 if (super_method->IsFinal()) { 3566 ThrowLinkageError(klass.get(), "Method %s overrides final method in class %s", 3567 PrettyMethod(local_method).c_str(), 3568 super_mh.GetDeclaringClassDescriptor()); 3569 return false; 3570 } 3571 vtable->Set<false>(j, local_method); 3572 local_method->SetMethodIndex(j); 3573 break; 3574 } else { 3575 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3576 << " would have incorrectly overridden the package-private method in " 3577 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3578 } 3579 } 3580 } 3581 if (j == actual_count) { 3582 // Not overriding, append. 3583 vtable->Set<false>(actual_count, local_method); 3584 local_method->SetMethodIndex(actual_count); 3585 actual_count += 1; 3586 } 3587 } 3588 if (!IsUint(16, actual_count)) { 3589 ThrowClassFormatError(klass.get(), "Too many methods defined on class: %zd", actual_count); 3590 return false; 3591 } 3592 // Shrink vtable if possible 3593 CHECK_LE(actual_count, max_count); 3594 if (actual_count < max_count) { 3595 vtable.reset(vtable->CopyOf(self, actual_count)); 3596 if (UNLIKELY(vtable.get() == NULL)) { 3597 CHECK(self->IsExceptionPending()); // OOME. 3598 return false; 3599 } 3600 } 3601 klass->SetVTable(vtable.get()); 3602 } else { 3603 CHECK(klass.get() == GetClassRoot(kJavaLangObject)); 3604 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3605 if (!IsUint(16, num_virtual_methods)) { 3606 ThrowClassFormatError(klass.get(), "Too many methods: %d", num_virtual_methods); 3607 return false; 3608 } 3609 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3610 vtable(self, AllocArtMethodArray(self, num_virtual_methods)); 3611 if (UNLIKELY(vtable.get() == NULL)) { 3612 CHECK(self->IsExceptionPending()); // OOME. 3613 return false; 3614 } 3615 for (size_t i = 0; i < num_virtual_methods; ++i) { 3616 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3617 vtable->Set<false>(i, virtual_method); 3618 virtual_method->SetMethodIndex(i & 0xFFFF); 3619 } 3620 klass->SetVTable(vtable.get()); 3621 } 3622 return true; 3623} 3624 3625bool ClassLinker::LinkInterfaceMethods(const SirtRef<mirror::Class>& klass, 3626 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3627 // Set the imt table to be all conflicts by default. 3628 klass->SetImTable(Runtime::Current()->GetDefaultImt()); 3629 size_t super_ifcount; 3630 if (klass->HasSuperClass()) { 3631 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3632 } else { 3633 super_ifcount = 0; 3634 } 3635 size_t ifcount = super_ifcount; 3636 uint32_t num_interfaces; 3637 { 3638 ClassHelper kh(klass.get()); 3639 num_interfaces = 3640 interfaces.get() == nullptr ? kh.NumDirectInterfaces() : interfaces->GetLength(); 3641 ifcount += num_interfaces; 3642 for (size_t i = 0; i < num_interfaces; i++) { 3643 mirror::Class* interface = 3644 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3645 ifcount += interface->GetIfTableCount(); 3646 } 3647 } 3648 if (ifcount == 0) { 3649 // Class implements no interfaces. 3650 DCHECK_EQ(klass->GetIfTableCount(), 0); 3651 DCHECK(klass->GetIfTable() == NULL); 3652 return true; 3653 } 3654 if (ifcount == super_ifcount) { 3655 // Class implements same interfaces as parent, are any of these not marker interfaces? 3656 bool has_non_marker_interface = false; 3657 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3658 for (size_t i = 0; i < ifcount; ++i) { 3659 if (super_iftable->GetMethodArrayCount(i) > 0) { 3660 has_non_marker_interface = true; 3661 break; 3662 } 3663 } 3664 if (!has_non_marker_interface) { 3665 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3666 klass->SetIfTable(super_iftable); 3667 return true; 3668 } 3669 } 3670 Thread* self = Thread::Current(); 3671 SirtRef<mirror::IfTable> iftable(self, AllocIfTable(self, ifcount)); 3672 if (UNLIKELY(iftable.get() == NULL)) { 3673 CHECK(self->IsExceptionPending()); // OOME. 3674 return false; 3675 } 3676 if (super_ifcount != 0) { 3677 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3678 for (size_t i = 0; i < super_ifcount; i++) { 3679 mirror::Class* super_interface = super_iftable->GetInterface(i); 3680 iftable->SetInterface(i, super_interface); 3681 } 3682 } 3683 // Flatten the interface inheritance hierarchy. 3684 size_t idx = super_ifcount; 3685 for (size_t i = 0; i < num_interfaces; i++) { 3686 ClassHelper kh(klass.get()); 3687 mirror::Class* interface = 3688 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3689 DCHECK(interface != NULL); 3690 if (!interface->IsInterface()) { 3691 ClassHelper ih(interface); 3692 ThrowIncompatibleClassChangeError(klass.get(), "Class %s implements non-interface class %s", 3693 PrettyDescriptor(klass.get()).c_str(), 3694 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3695 return false; 3696 } 3697 // Check if interface is already in iftable 3698 bool duplicate = false; 3699 for (size_t j = 0; j < idx; j++) { 3700 mirror::Class* existing_interface = iftable->GetInterface(j); 3701 if (existing_interface == interface) { 3702 duplicate = true; 3703 break; 3704 } 3705 } 3706 if (!duplicate) { 3707 // Add this non-duplicate interface. 3708 iftable->SetInterface(idx++, interface); 3709 // Add this interface's non-duplicate super-interfaces. 3710 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3711 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3712 bool super_duplicate = false; 3713 for (size_t k = 0; k < idx; k++) { 3714 mirror::Class* existing_interface = iftable->GetInterface(k); 3715 if (existing_interface == super_interface) { 3716 super_duplicate = true; 3717 break; 3718 } 3719 } 3720 if (!super_duplicate) { 3721 iftable->SetInterface(idx++, super_interface); 3722 } 3723 } 3724 } 3725 } 3726 // Shrink iftable in case duplicates were found 3727 if (idx < ifcount) { 3728 iftable.reset(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3729 if (UNLIKELY(iftable.get() == NULL)) { 3730 CHECK(self->IsExceptionPending()); // OOME. 3731 return false; 3732 } 3733 ifcount = idx; 3734 } else { 3735 CHECK_EQ(idx, ifcount); 3736 } 3737 klass->SetIfTable(iftable.get()); 3738 3739 // If we're an interface, we don't need the vtable pointers, so we're done. 3740 if (klass->IsInterface()) { 3741 return true; 3742 } 3743 // Allocate imtable 3744 bool imtable_changed = false; 3745 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > imtable(self, AllocArtMethodArray(self, kImtSize)); 3746 if (UNLIKELY(imtable.get() == NULL)) { 3747 CHECK(self->IsExceptionPending()); // OOME. 3748 return false; 3749 } 3750 std::vector<mirror::ArtMethod*> miranda_list; 3751 for (size_t i = 0; i < ifcount; ++i) { 3752 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 3753 if (num_methods > 0) { 3754 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3755 method_array(self, AllocArtMethodArray(self, num_methods)); 3756 if (UNLIKELY(method_array.get() == nullptr)) { 3757 CHECK(self->IsExceptionPending()); // OOME. 3758 return false; 3759 } 3760 iftable->SetMethodArray(i, method_array.get()); 3761 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > vtable(self, 3762 klass->GetVTableDuringLinking()); 3763 for (size_t j = 0; j < num_methods; ++j) { 3764 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 3765 MethodHelper interface_mh(interface_method); 3766 int32_t k; 3767 // For each method listed in the interface's method list, find the 3768 // matching method in our class's method list. We want to favor the 3769 // subclass over the superclass, which just requires walking 3770 // back from the end of the vtable. (This only matters if the 3771 // superclass defines a private method and this class redefines 3772 // it -- otherwise it would use the same vtable slot. In .dex files 3773 // those don't end up in the virtual method table, so it shouldn't 3774 // matter which direction we go. We walk it backward anyway.) 3775 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3776 mirror::ArtMethod* vtable_method = vtable->Get(k); 3777 MethodHelper vtable_mh(vtable_method); 3778 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3779 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3780 ThrowIllegalAccessError(klass.get(), 3781 "Method '%s' implementing interface method '%s' is not public", 3782 PrettyMethod(vtable_method).c_str(), 3783 PrettyMethod(interface_method).c_str()); 3784 return false; 3785 } 3786 method_array->Set<false>(j, vtable_method); 3787 // Place method in imt if entry is empty, place conflict otherwise. 3788 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3789 if (imtable->Get(imt_index) == NULL) { 3790 imtable->Set<false>(imt_index, vtable_method); 3791 imtable_changed = true; 3792 } else { 3793 imtable->Set<false>(imt_index, Runtime::Current()->GetImtConflictMethod()); 3794 } 3795 break; 3796 } 3797 } 3798 if (k < 0) { 3799 SirtRef<mirror::ArtMethod> miranda_method(self, NULL); 3800 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3801 mirror::ArtMethod* mir_method = miranda_list[mir]; 3802 MethodHelper vtable_mh(mir_method); 3803 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3804 miranda_method.reset(miranda_list[mir]); 3805 break; 3806 } 3807 } 3808 if (miranda_method.get() == NULL) { 3809 // Point the interface table at a phantom slot. 3810 miranda_method.reset(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3811 if (UNLIKELY(miranda_method.get() == NULL)) { 3812 CHECK(self->IsExceptionPending()); // OOME. 3813 return false; 3814 } 3815 // TODO: If a methods move then the miranda_list may hold stale references. 3816 miranda_list.push_back(miranda_method.get()); 3817 } 3818 method_array->Set<false>(j, miranda_method.get()); 3819 } 3820 } 3821 } 3822 } 3823 if (imtable_changed) { 3824 // Fill in empty entries in interface method table with conflict. 3825 mirror::ArtMethod* imt_conflict_method = Runtime::Current()->GetImtConflictMethod(); 3826 for (size_t i = 0; i < kImtSize; i++) { 3827 if (imtable->Get(i) == NULL) { 3828 imtable->Set<false>(i, imt_conflict_method); 3829 } 3830 } 3831 klass->SetImTable(imtable.get()); 3832 } 3833 if (!miranda_list.empty()) { 3834 int old_method_count = klass->NumVirtualMethods(); 3835 int new_method_count = old_method_count + miranda_list.size(); 3836 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3837 if (old_method_count == 0) { 3838 virtuals = AllocArtMethodArray(self, new_method_count); 3839 } else { 3840 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3841 } 3842 if (UNLIKELY(virtuals == NULL)) { 3843 CHECK(self->IsExceptionPending()); // OOME. 3844 return false; 3845 } 3846 klass->SetVirtualMethods(virtuals); 3847 3848 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3849 vtable(self, klass->GetVTableDuringLinking()); 3850 CHECK(vtable.get() != NULL); 3851 int old_vtable_count = vtable->GetLength(); 3852 int new_vtable_count = old_vtable_count + miranda_list.size(); 3853 vtable.reset(vtable->CopyOf(self, new_vtable_count)); 3854 if (UNLIKELY(vtable.get() == NULL)) { 3855 CHECK(self->IsExceptionPending()); // OOME. 3856 return false; 3857 } 3858 for (size_t i = 0; i < miranda_list.size(); ++i) { 3859 mirror::ArtMethod* method = miranda_list[i]; 3860 // Leave the declaring class alone as type indices are relative to it 3861 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3862 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3863 klass->SetVirtualMethod(old_method_count + i, method); 3864 vtable->Set<false>(old_vtable_count + i, method); 3865 } 3866 // TODO: do not assign to the vtable field until it is fully constructed. 3867 klass->SetVTable(vtable.get()); 3868 } 3869 3870 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3871 for (int i = 0; i < vtable->GetLength(); ++i) { 3872 CHECK(vtable->Get(i) != NULL); 3873 } 3874 3875// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3876 3877 return true; 3878} 3879 3880bool ClassLinker::LinkInstanceFields(const SirtRef<mirror::Class>& klass) { 3881 CHECK(klass.get() != NULL); 3882 return LinkFields(klass, false); 3883} 3884 3885bool ClassLinker::LinkStaticFields(const SirtRef<mirror::Class>& klass) { 3886 CHECK(klass.get() != NULL); 3887 size_t allocated_class_size = klass->GetClassSize(); 3888 bool success = LinkFields(klass, true); 3889 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3890 return success; 3891} 3892 3893struct LinkFieldsComparator { 3894 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3895 } 3896 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3897 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 3898 NO_THREAD_SAFETY_ANALYSIS { 3899 // First come reference fields, then 64-bit, and finally 32-bit 3900 FieldHelper fh1(field1); 3901 Primitive::Type type1 = fh1.GetTypeAsPrimitiveType(); 3902 FieldHelper fh2(field2); 3903 Primitive::Type type2 = fh2.GetTypeAsPrimitiveType(); 3904 if (type1 != type2) { 3905 bool is_primitive1 = type1 != Primitive::kPrimNot; 3906 bool is_primitive2 = type2 != Primitive::kPrimNot; 3907 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3908 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3909 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 3910 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 3911 if (order1 != order2) { 3912 return order1 < order2; 3913 } 3914 } 3915 // same basic group? then sort by string. 3916 const char* name1 = fh1.GetName(); 3917 const char* name2 = fh2.GetName(); 3918 return strcmp(name1, name2) < 0; 3919 } 3920}; 3921 3922bool ClassLinker::LinkFields(const SirtRef<mirror::Class>& klass, bool is_static) { 3923 size_t num_fields = 3924 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3925 3926 mirror::ObjectArray<mirror::ArtField>* fields = 3927 is_static ? klass->GetSFields() : klass->GetIFields(); 3928 3929 // Initialize size and field_offset 3930 size_t size; 3931 MemberOffset field_offset(0); 3932 if (is_static) { 3933 size = klass->GetClassSize(); 3934 field_offset = mirror::Class::FieldsOffset(); 3935 } else { 3936 mirror::Class* super_class = klass->GetSuperClass(); 3937 if (super_class != NULL) { 3938 CHECK(super_class->IsResolved()); 3939 field_offset = MemberOffset(super_class->GetObjectSize()); 3940 } 3941 size = field_offset.Uint32Value(); 3942 } 3943 3944 CHECK_EQ(num_fields == 0, fields == NULL); 3945 3946 // we want a relatively stable order so that adding new fields 3947 // minimizes disruption of C++ version such as Class and Method. 3948 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3949 for (size_t i = 0; i < num_fields; i++) { 3950 mirror::ArtField* f = fields->Get(i); 3951 CHECK(f != NULL); 3952 grouped_and_sorted_fields.push_back(f); 3953 } 3954 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 3955 LinkFieldsComparator()); 3956 3957 // References should be at the front. 3958 size_t current_field = 0; 3959 size_t num_reference_fields = 0; 3960 for (; current_field < num_fields; current_field++) { 3961 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3962 FieldHelper fh(field); 3963 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3964 bool isPrimitive = type != Primitive::kPrimNot; 3965 if (isPrimitive) { 3966 break; // past last reference, move on to the next phase 3967 } 3968 grouped_and_sorted_fields.pop_front(); 3969 num_reference_fields++; 3970 fields->Set<false>(current_field, field); 3971 field->SetOffset(field_offset); 3972 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3973 } 3974 3975 // Now we want to pack all of the double-wide fields together. If 3976 // we're not aligned, though, we want to shuffle one 32-bit field 3977 // into place. If we can't find one, we'll have to pad it. 3978 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3979 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3980 mirror::ArtField* field = grouped_and_sorted_fields[i]; 3981 FieldHelper fh(field); 3982 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3983 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3984 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 3985 continue; 3986 } 3987 fields->Set<false>(current_field++, field); 3988 field->SetOffset(field_offset); 3989 // drop the consumed field 3990 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 3991 break; 3992 } 3993 // whether we found a 32-bit field for padding or not, we advance 3994 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3995 } 3996 3997 // Alignment is good, shuffle any double-wide fields forward, and 3998 // finish assigning field offsets to all fields. 3999 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 4000 while (!grouped_and_sorted_fields.empty()) { 4001 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4002 grouped_and_sorted_fields.pop_front(); 4003 FieldHelper fh(field); 4004 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4005 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 4006 fields->Set<false>(current_field, field); 4007 field->SetOffset(field_offset); 4008 field_offset = MemberOffset(field_offset.Uint32Value() + 4009 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4010 ? sizeof(uint64_t) 4011 : sizeof(uint32_t))); 4012 current_field++; 4013 } 4014 4015 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4016 if (!is_static && 4017 (strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0)) { 4018 // We know there are no non-reference fields in the Reference classes, and we know 4019 // that 'referent' is alphabetically last, so this is easy... 4020 CHECK_EQ(num_reference_fields, num_fields); 4021 FieldHelper fh(fields->Get(num_fields - 1)); 4022 CHECK_STREQ(fh.GetName(), "referent"); 4023 --num_reference_fields; 4024 } 4025 4026 if (kIsDebugBuild) { 4027 // Make sure that all reference fields appear before 4028 // non-reference fields, and all double-wide fields are aligned. 4029 bool seen_non_ref = false; 4030 for (size_t i = 0; i < num_fields; i++) { 4031 mirror::ArtField* field = fields->Get(i); 4032 if (false) { // enable to debug field layout 4033 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4034 << " class=" << PrettyClass(klass.get()) 4035 << " field=" << PrettyField(field) 4036 << " offset=" << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset()), 4037 false); 4038 } 4039 FieldHelper fh(field); 4040 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4041 bool is_primitive = type != Primitive::kPrimNot; 4042 if ((strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0) 4043 && (strcmp("referent", fh.GetName()) == 0)) { 4044 is_primitive = true; // We lied above, so we have to expect a lie here. 4045 } 4046 if (is_primitive) { 4047 if (!seen_non_ref) { 4048 seen_non_ref = true; 4049 DCHECK_EQ(num_reference_fields, i); 4050 } 4051 } else { 4052 DCHECK(!seen_non_ref); 4053 } 4054 } 4055 if (!seen_non_ref) { 4056 DCHECK_EQ(num_fields, num_reference_fields); 4057 } 4058 } 4059 size = field_offset.Uint32Value(); 4060 // Update klass 4061 if (is_static) { 4062 klass->SetNumReferenceStaticFields(num_reference_fields); 4063 klass->SetClassSize(size); 4064 } else { 4065 klass->SetNumReferenceInstanceFields(num_reference_fields); 4066 if (!klass->IsVariableSize()) { 4067 DCHECK_GE(size, sizeof(mirror::Object)) << ClassHelper(klass.get()).GetDescriptor(); 4068 size_t previous_size = klass->GetObjectSize(); 4069 if (previous_size != 0) { 4070 // Make sure that we didn't originally have an incorrect size. 4071 CHECK_EQ(previous_size, size); 4072 } 4073 klass->SetObjectSize(size); 4074 } 4075 } 4076 return true; 4077} 4078 4079// Set the bitmap of reference offsets, refOffsets, from the ifields 4080// list. 4081void ClassLinker::CreateReferenceInstanceOffsets(const SirtRef<mirror::Class>& klass) { 4082 uint32_t reference_offsets = 0; 4083 mirror::Class* super_class = klass->GetSuperClass(); 4084 if (super_class != NULL) { 4085 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4086 // If our superclass overflowed, we don't stand a chance. 4087 if (reference_offsets == CLASS_WALK_SUPER) { 4088 klass->SetReferenceInstanceOffsets(reference_offsets); 4089 return; 4090 } 4091 } 4092 CreateReferenceOffsets(klass, false, reference_offsets); 4093} 4094 4095void ClassLinker::CreateReferenceStaticOffsets(const SirtRef<mirror::Class>& klass) { 4096 CreateReferenceOffsets(klass, true, 0); 4097} 4098 4099void ClassLinker::CreateReferenceOffsets(const SirtRef<mirror::Class>& klass, bool is_static, 4100 uint32_t reference_offsets) { 4101 size_t num_reference_fields = 4102 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4103 : klass->NumReferenceInstanceFieldsDuringLinking(); 4104 mirror::ObjectArray<mirror::ArtField>* fields = 4105 is_static ? klass->GetSFields() : klass->GetIFields(); 4106 // All of the fields that contain object references are guaranteed 4107 // to be at the beginning of the fields list. 4108 for (size_t i = 0; i < num_reference_fields; ++i) { 4109 // Note that byte_offset is the offset from the beginning of 4110 // object, not the offset into instance data 4111 mirror::ArtField* field = fields->Get(i); 4112 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4113 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4114 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4115 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4116 CHECK_NE(new_bit, 0U); 4117 reference_offsets |= new_bit; 4118 } else { 4119 reference_offsets = CLASS_WALK_SUPER; 4120 break; 4121 } 4122 } 4123 // Update fields in klass 4124 if (is_static) { 4125 klass->SetReferenceStaticOffsets(reference_offsets); 4126 } else { 4127 klass->SetReferenceInstanceOffsets(reference_offsets); 4128 } 4129} 4130 4131mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4132 const SirtRef<mirror::DexCache>& dex_cache) { 4133 DCHECK(dex_cache.get() != nullptr); 4134 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4135 if (resolved != NULL) { 4136 return resolved; 4137 } 4138 uint32_t utf16_length; 4139 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4140 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4141 dex_cache->SetResolvedString(string_idx, string); 4142 return string; 4143} 4144 4145mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4146 mirror::Class* referrer) { 4147 Thread* self = Thread::Current(); 4148 SirtRef<mirror::DexCache> dex_cache(self, referrer->GetDexCache()); 4149 SirtRef<mirror::ClassLoader> class_loader(self, referrer->GetClassLoader()); 4150 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4151} 4152 4153mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4154 const SirtRef<mirror::DexCache>& dex_cache, 4155 const SirtRef<mirror::ClassLoader>& class_loader) { 4156 DCHECK(dex_cache.get() != NULL); 4157 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4158 if (resolved == NULL) { 4159 Thread* self = Thread::Current(); 4160 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4161 resolved = FindClass(self, descriptor, class_loader); 4162 if (resolved != NULL) { 4163 // TODO: we used to throw here if resolved's class loader was not the 4164 // boot class loader. This was to permit different classes with the 4165 // same name to be loaded simultaneously by different loaders 4166 dex_cache->SetResolvedType(type_idx, resolved); 4167 } else { 4168 CHECK(self->IsExceptionPending()) 4169 << "Expected pending exception for failed resolution of: " << descriptor; 4170 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4171 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 4172 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4173 DCHECK(resolved == NULL); // No SirtRef needed to preserve resolved. 4174 self->ClearException(); 4175 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4176 self->GetException(NULL)->SetCause(cause.get()); 4177 } 4178 } 4179 } 4180 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4181 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4182 return resolved; 4183} 4184 4185mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 4186 uint32_t method_idx, 4187 const SirtRef<mirror::DexCache>& dex_cache, 4188 const SirtRef<mirror::ClassLoader>& class_loader, 4189 mirror::ArtMethod* referrer, 4190 InvokeType type) { 4191 DCHECK(dex_cache.get() != NULL); 4192 // Check for hit in the dex cache. 4193 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4194 if (resolved != NULL && !resolved->IsRuntimeMethod()) { 4195 return resolved; 4196 } 4197 // Fail, get the declaring class. 4198 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4199 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4200 if (klass == NULL) { 4201 DCHECK(Thread::Current()->IsExceptionPending()); 4202 return NULL; 4203 } 4204 // Scan using method_idx, this saves string compares but will only hit for matching dex 4205 // caches/files. 4206 switch (type) { 4207 case kDirect: // Fall-through. 4208 case kStatic: 4209 resolved = klass->FindDirectMethod(dex_cache.get(), method_idx); 4210 break; 4211 case kInterface: 4212 resolved = klass->FindInterfaceMethod(dex_cache.get(), method_idx); 4213 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4214 break; 4215 case kSuper: // Fall-through. 4216 case kVirtual: 4217 resolved = klass->FindVirtualMethod(dex_cache.get(), method_idx); 4218 break; 4219 default: 4220 LOG(FATAL) << "Unreachable - invocation type: " << type; 4221 } 4222 if (resolved == NULL) { 4223 // Search by name, which works across dex files. 4224 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4225 const Signature signature = dex_file.GetMethodSignature(method_id); 4226 switch (type) { 4227 case kDirect: // Fall-through. 4228 case kStatic: 4229 resolved = klass->FindDirectMethod(name, signature); 4230 break; 4231 case kInterface: 4232 resolved = klass->FindInterfaceMethod(name, signature); 4233 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4234 break; 4235 case kSuper: // Fall-through. 4236 case kVirtual: 4237 resolved = klass->FindVirtualMethod(name, signature); 4238 break; 4239 } 4240 } 4241 if (resolved != NULL) { 4242 // We found a method, check for incompatible class changes. 4243 if (resolved->CheckIncompatibleClassChange(type)) { 4244 resolved = NULL; 4245 } 4246 } 4247 if (resolved != NULL) { 4248 // Be a good citizen and update the dex cache to speed subsequent calls. 4249 dex_cache->SetResolvedMethod(method_idx, resolved); 4250 return resolved; 4251 } else { 4252 // We failed to find the method which means either an access error, an incompatible class 4253 // change, or no such method. First try to find the method among direct and virtual methods. 4254 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4255 const Signature signature = dex_file.GetMethodSignature(method_id); 4256 switch (type) { 4257 case kDirect: 4258 case kStatic: 4259 resolved = klass->FindVirtualMethod(name, signature); 4260 break; 4261 case kInterface: 4262 case kVirtual: 4263 case kSuper: 4264 resolved = klass->FindDirectMethod(name, signature); 4265 break; 4266 } 4267 4268 // If we found something, check that it can be accessed by the referrer. 4269 if (resolved != NULL && referrer != NULL) { 4270 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4271 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4272 if (!referring_class->CanAccess(methods_class)) { 4273 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4274 resolved, type); 4275 return NULL; 4276 } else if (!referring_class->CanAccessMember(methods_class, 4277 resolved->GetAccessFlags())) { 4278 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4279 return NULL; 4280 } 4281 } 4282 4283 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4284 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4285 switch (type) { 4286 case kDirect: 4287 case kStatic: 4288 if (resolved != NULL) { 4289 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4290 } else { 4291 resolved = klass->FindInterfaceMethod(name, signature); 4292 if (resolved != NULL) { 4293 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4294 } else { 4295 ThrowNoSuchMethodError(type, klass, name, signature); 4296 } 4297 } 4298 break; 4299 case kInterface: 4300 if (resolved != NULL) { 4301 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4302 } else { 4303 resolved = klass->FindVirtualMethod(name, signature); 4304 if (resolved != NULL) { 4305 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4306 } else { 4307 ThrowNoSuchMethodError(type, klass, name, signature); 4308 } 4309 } 4310 break; 4311 case kSuper: 4312 ThrowNoSuchMethodError(type, klass, name, signature); 4313 break; 4314 case kVirtual: 4315 if (resolved != NULL) { 4316 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4317 } else { 4318 resolved = klass->FindInterfaceMethod(name, signature); 4319 if (resolved != NULL) { 4320 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4321 } else { 4322 ThrowNoSuchMethodError(type, klass, name, signature); 4323 } 4324 } 4325 break; 4326 } 4327 DCHECK(Thread::Current()->IsExceptionPending()); 4328 return NULL; 4329 } 4330} 4331 4332mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4333 const SirtRef<mirror::DexCache>& dex_cache, 4334 const SirtRef<mirror::ClassLoader>& class_loader, 4335 bool is_static) { 4336 DCHECK(dex_cache.get() != nullptr); 4337 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4338 if (resolved != NULL) { 4339 return resolved; 4340 } 4341 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4342 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4343 if (klass == NULL) { 4344 DCHECK(Thread::Current()->IsExceptionPending()); 4345 return NULL; 4346 } 4347 4348 if (is_static) { 4349 resolved = klass->FindStaticField(dex_cache.get(), field_idx); 4350 } else { 4351 resolved = klass->FindInstanceField(dex_cache.get(), field_idx); 4352 } 4353 4354 if (resolved == NULL) { 4355 const char* name = dex_file.GetFieldName(field_id); 4356 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4357 if (is_static) { 4358 resolved = klass->FindStaticField(name, type); 4359 } else { 4360 resolved = klass->FindInstanceField(name, type); 4361 } 4362 if (resolved == NULL) { 4363 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 4364 return NULL; 4365 } 4366 } 4367 dex_cache->SetResolvedField(field_idx, resolved); 4368 return resolved; 4369} 4370 4371mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4372 uint32_t field_idx, 4373 const SirtRef<mirror::DexCache>& dex_cache, 4374 const SirtRef<mirror::ClassLoader>& class_loader) { 4375 DCHECK(dex_cache.get() != nullptr); 4376 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4377 if (resolved != NULL) { 4378 return resolved; 4379 } 4380 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4381 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4382 if (klass == NULL) { 4383 DCHECK(Thread::Current()->IsExceptionPending()); 4384 return NULL; 4385 } 4386 4387 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4388 StringPiece type(dex_file.StringDataByIdx( 4389 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4390 resolved = klass->FindField(name, type); 4391 if (resolved != NULL) { 4392 dex_cache->SetResolvedField(field_idx, resolved); 4393 } else { 4394 ThrowNoSuchFieldError("", klass, type, name); 4395 } 4396 return resolved; 4397} 4398 4399const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4400 uint32_t* length) { 4401 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4402 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4403 const DexFile& dex_file = *dex_cache->GetDexFile(); 4404 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4405 return dex_file.GetMethodShorty(method_id, length); 4406} 4407 4408void ClassLinker::DumpAllClasses(int flags) { 4409 if (dex_cache_image_class_lookup_required_) { 4410 MoveImageClassesToClassTable(); 4411 } 4412 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4413 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4414 std::vector<mirror::Class*> all_classes; 4415 { 4416 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4417 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 4418 all_classes.push_back(it.second); 4419 } 4420 } 4421 4422 for (size_t i = 0; i < all_classes.size(); ++i) { 4423 all_classes[i]->DumpClass(std::cerr, flags); 4424 } 4425} 4426 4427void ClassLinker::DumpForSigQuit(std::ostream& os) { 4428 if (dex_cache_image_class_lookup_required_) { 4429 MoveImageClassesToClassTable(); 4430 } 4431 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4432 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4433} 4434 4435size_t ClassLinker::NumLoadedClasses() { 4436 if (dex_cache_image_class_lookup_required_) { 4437 MoveImageClassesToClassTable(); 4438 } 4439 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4440 return class_table_.size(); 4441} 4442 4443pid_t ClassLinker::GetClassesLockOwner() { 4444 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4445} 4446 4447pid_t ClassLinker::GetDexLockOwner() { 4448 return dex_lock_.GetExclusiveOwnerTid(); 4449} 4450 4451void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4452 DCHECK(!init_done_); 4453 4454 DCHECK(klass != NULL); 4455 DCHECK(klass->GetClassLoader() == NULL); 4456 4457 DCHECK(class_roots_ != NULL); 4458 DCHECK(class_roots_->Get(class_root) == NULL); 4459 class_roots_->Set<false>(class_root, klass); 4460} 4461 4462} // namespace art 4463