class_linker.cc revision c0a9ea40237de8fa3c623f68c904d416a3a79bf5
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <fcntl.h> 20#include <sys/file.h> 21#include <sys/stat.h> 22#include <sys/types.h> 23#include <sys/wait.h> 24 25#include <deque> 26#include <string> 27#include <utility> 28#include <vector> 29 30#include "base/casts.h" 31#include "base/logging.h" 32#include "base/stl_util.h" 33#include "base/unix_file/fd_file.h" 34#include "class_linker-inl.h" 35#include "compiler_callbacks.h" 36#include "debugger.h" 37#include "dex_file-inl.h" 38#include "gc/accounting/card_table-inl.h" 39#include "gc/accounting/heap_bitmap.h" 40#include "gc/heap.h" 41#include "gc/space/image_space.h" 42#include "intern_table.h" 43#include "interpreter/interpreter.h" 44#include "leb128.h" 45#include "oat.h" 46#include "oat_file.h" 47#include "mirror/art_field-inl.h" 48#include "mirror/art_method-inl.h" 49#include "mirror/class.h" 50#include "mirror/class-inl.h" 51#include "mirror/class_loader.h" 52#include "mirror/dex_cache-inl.h" 53#include "mirror/iftable-inl.h" 54#include "mirror/object-inl.h" 55#include "mirror/object_array-inl.h" 56#include "mirror/proxy.h" 57#include "mirror/stack_trace_element.h" 58#include "object_utils.h" 59#include "os.h" 60#include "runtime.h" 61#include "entrypoints/entrypoint_utils.h" 62#include "ScopedLocalRef.h" 63#include "scoped_thread_state_change.h" 64#include "sirt_ref.h" 65#include "stack_indirect_reference_table.h" 66#include "thread.h" 67#include "UniquePtr.h" 68#include "utils.h" 69#include "verifier/method_verifier.h" 70#include "well_known_classes.h" 71 72namespace art { 73 74static void ThrowNoClassDefFoundError(const char* fmt, ...) 75 __attribute__((__format__(__printf__, 1, 2))) 76 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 77static void ThrowNoClassDefFoundError(const char* fmt, ...) { 78 va_list args; 79 va_start(args, fmt); 80 Thread* self = Thread::Current(); 81 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 82 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 83 va_end(args); 84} 85 86static void ThrowEarlierClassFailure(mirror::Class* c) 87 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 88 // The class failed to initialize on a previous attempt, so we want to throw 89 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 90 // failed in verification, in which case v2 5.4.1 says we need to re-throw 91 // the previous error. 92 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 93 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 94 } 95 96 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 97 Thread* self = Thread::Current(); 98 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 99 if (c->GetVerifyErrorClass() != NULL) { 100 // TODO: change the verifier to store an _instance_, with a useful detail message? 101 ClassHelper ve_ch(c->GetVerifyErrorClass()); 102 self->ThrowNewException(throw_location, ve_ch.GetDescriptor(), PrettyDescriptor(c).c_str()); 103 } else { 104 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 105 PrettyDescriptor(c).c_str()); 106 } 107} 108 109static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 110 Thread* self = Thread::Current(); 111 JNIEnv* env = self->GetJniEnv(); 112 113 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 114 CHECK(cause.get() != NULL); 115 116 env->ExceptionClear(); 117 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 118 env->Throw(cause.get()); 119 120 // We only wrap non-Error exceptions; an Error can just be used as-is. 121 if (!is_error) { 122 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 123 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 124 } 125} 126 127static size_t Hash(const char* s) { 128 // This is the java.lang.String hashcode for convenience, not interoperability. 129 size_t hash = 0; 130 for (; *s != '\0'; ++s) { 131 hash = hash * 31 + *s; 132 } 133 return hash; 134} 135 136const char* ClassLinker::class_roots_descriptors_[] = { 137 "Ljava/lang/Class;", 138 "Ljava/lang/Object;", 139 "[Ljava/lang/Class;", 140 "[Ljava/lang/Object;", 141 "Ljava/lang/String;", 142 "Ljava/lang/DexCache;", 143 "Ljava/lang/ref/Reference;", 144 "Ljava/lang/reflect/ArtField;", 145 "Ljava/lang/reflect/ArtMethod;", 146 "Ljava/lang/reflect/Proxy;", 147 "[Ljava/lang/String;", 148 "[Ljava/lang/reflect/ArtField;", 149 "[Ljava/lang/reflect/ArtMethod;", 150 "Ljava/lang/ClassLoader;", 151 "Ljava/lang/Throwable;", 152 "Ljava/lang/ClassNotFoundException;", 153 "Ljava/lang/StackTraceElement;", 154 "Z", 155 "B", 156 "C", 157 "D", 158 "F", 159 "I", 160 "J", 161 "S", 162 "V", 163 "[Z", 164 "[B", 165 "[C", 166 "[D", 167 "[F", 168 "[I", 169 "[J", 170 "[S", 171 "[Ljava/lang/StackTraceElement;", 172}; 173 174ClassLinker::ClassLinker(InternTable* intern_table) 175 // dex_lock_ is recursive as it may be used in stack dumping. 176 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 177 dex_cache_image_class_lookup_required_(false), 178 failed_dex_cache_class_lookups_(0), 179 class_roots_(NULL), 180 array_iftable_(NULL), 181 init_done_(false), 182 dex_caches_dirty_(false), 183 class_table_dirty_(false), 184 intern_table_(intern_table), 185 portable_resolution_trampoline_(NULL), 186 quick_resolution_trampoline_(NULL), 187 portable_imt_conflict_trampoline_(NULL), 188 quick_imt_conflict_trampoline_(NULL) { 189 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 190} 191 192void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 193 VLOG(startup) << "ClassLinker::Init"; 194 CHECK(Runtime::Current()->IsCompiler()); 195 196 CHECK(!init_done_); 197 198 // java_lang_Class comes first, it's needed for AllocClass 199 Thread* self = Thread::Current(); 200 gc::Heap* heap = Runtime::Current()->GetHeap(); 201 // The GC can't handle an object with a null class since we can't get the size of this object. 202 heap->IncrementDisableMovingGC(self); 203 SirtRef<mirror::Class> java_lang_Class(self, down_cast<mirror::Class*>( 204 heap->AllocNonMovableObject<true>(self, nullptr, sizeof(mirror::ClassClass)))); 205 CHECK(java_lang_Class.get() != NULL); 206 mirror::Class::SetClassClass(java_lang_Class.get()); 207 java_lang_Class->SetClass(java_lang_Class.get()); 208 java_lang_Class->SetClassSize(sizeof(mirror::ClassClass)); 209 heap->DecrementDisableMovingGC(self); 210 // AllocClass(mirror::Class*) can now be used 211 212 // Class[] is used for reflection support. 213 SirtRef<mirror::Class> class_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 214 class_array_class->SetComponentType(java_lang_Class.get()); 215 216 // java_lang_Object comes next so that object_array_class can be created. 217 SirtRef<mirror::Class> java_lang_Object(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 218 CHECK(java_lang_Object.get() != NULL); 219 // backfill Object as the super class of Class. 220 java_lang_Class->SetSuperClass(java_lang_Object.get()); 221 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 222 223 // Object[] next to hold class roots. 224 SirtRef<mirror::Class> object_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 225 object_array_class->SetComponentType(java_lang_Object.get()); 226 227 // Setup the char class to be used for char[]. 228 SirtRef<mirror::Class> char_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 229 230 // Setup the char[] class to be used for String. 231 SirtRef<mirror::Class> char_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 232 char_array_class->SetComponentType(char_class.get()); 233 mirror::CharArray::SetArrayClass(char_array_class.get()); 234 235 // Setup String. 236 SirtRef<mirror::Class> java_lang_String(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::StringClass))); 237 mirror::String::SetClass(java_lang_String.get()); 238 java_lang_String->SetObjectSize(sizeof(mirror::String)); 239 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 240 241 // Create storage for root classes, save away our work so far (requires descriptors). 242 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.get(), 243 kClassRootsMax); 244 CHECK(class_roots_ != NULL); 245 SetClassRoot(kJavaLangClass, java_lang_Class.get()); 246 SetClassRoot(kJavaLangObject, java_lang_Object.get()); 247 SetClassRoot(kClassArrayClass, class_array_class.get()); 248 SetClassRoot(kObjectArrayClass, object_array_class.get()); 249 SetClassRoot(kCharArrayClass, char_array_class.get()); 250 SetClassRoot(kJavaLangString, java_lang_String.get()); 251 252 // Setup the primitive type classes. 253 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 254 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 255 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 256 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 257 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 258 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 259 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 260 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 261 262 // Create array interface entries to populate once we can load system classes. 263 array_iftable_ = AllocIfTable(self, 2); 264 265 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 266 SirtRef<mirror::Class> int_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 267 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 268 mirror::IntArray::SetArrayClass(int_array_class.get()); 269 SetClassRoot(kIntArrayClass, int_array_class.get()); 270 271 // now that these are registered, we can use AllocClass() and AllocObjectArray 272 273 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 274 SirtRef<mirror::Class> 275 java_lang_DexCache(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::DexCacheClass))); 276 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.get()); 277 java_lang_DexCache->SetObjectSize(sizeof(mirror::DexCache)); 278 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 279 280 // Constructor, Field, Method, and AbstractMethod are necessary so that FindClass can link members. 281 SirtRef<mirror::Class> java_lang_reflect_ArtField(self, AllocClass(self, java_lang_Class.get(), 282 sizeof(mirror::ArtFieldClass))); 283 CHECK(java_lang_reflect_ArtField.get() != NULL); 284 java_lang_reflect_ArtField->SetObjectSize(sizeof(mirror::ArtField)); 285 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.get()); 286 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 287 mirror::ArtField::SetClass(java_lang_reflect_ArtField.get()); 288 289 SirtRef<mirror::Class> java_lang_reflect_ArtMethod(self, AllocClass(self, java_lang_Class.get(), 290 sizeof(mirror::ArtMethodClass))); 291 CHECK(java_lang_reflect_ArtMethod.get() != NULL); 292 java_lang_reflect_ArtMethod->SetObjectSize(sizeof(mirror::ArtMethod)); 293 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.get()); 294 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 295 296 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.get()); 297 298 // Set up array classes for string, field, method 299 SirtRef<mirror::Class> object_array_string(self, AllocClass(self, java_lang_Class.get(), 300 sizeof(mirror::Class))); 301 object_array_string->SetComponentType(java_lang_String.get()); 302 SetClassRoot(kJavaLangStringArrayClass, object_array_string.get()); 303 304 SirtRef<mirror::Class> object_array_art_method(self, AllocClass(self, java_lang_Class.get(), 305 sizeof(mirror::Class))); 306 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.get()); 307 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.get()); 308 309 SirtRef<mirror::Class> object_array_art_field(self, AllocClass(self, java_lang_Class.get(), 310 sizeof(mirror::Class))); 311 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.get()); 312 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.get()); 313 314 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 315 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 316 // these roots. 317 CHECK_NE(0U, boot_class_path.size()); 318 for (size_t i = 0; i != boot_class_path.size(); ++i) { 319 const DexFile* dex_file = boot_class_path[i]; 320 CHECK(dex_file != NULL); 321 AppendToBootClassPath(*dex_file); 322 } 323 324 // now we can use FindSystemClass 325 326 // run char class through InitializePrimitiveClass to finish init 327 InitializePrimitiveClass(char_class.get(), Primitive::kPrimChar); 328 SetClassRoot(kPrimitiveChar, char_class.get()); // needs descriptor 329 330 // Create runtime resolution and imt conflict methods. Also setup the default imt. 331 Runtime* runtime = Runtime::Current(); 332 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 333 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 334 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 335 336 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 337 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 338 mirror::Class* Object_class = FindSystemClass("Ljava/lang/Object;"); 339 CHECK_EQ(java_lang_Object.get(), Object_class); 340 CHECK_EQ(java_lang_Object->GetObjectSize(), sizeof(mirror::Object)); 341 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 342 mirror::Class* String_class = FindSystemClass("Ljava/lang/String;"); 343 CHECK_EQ(java_lang_String.get(), String_class); 344 CHECK_EQ(java_lang_String->GetObjectSize(), sizeof(mirror::String)); 345 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 346 mirror::Class* DexCache_class = FindSystemClass("Ljava/lang/DexCache;"); 347 CHECK_EQ(java_lang_String.get(), String_class); 348 CHECK_EQ(java_lang_DexCache.get(), DexCache_class); 349 CHECK_EQ(java_lang_DexCache->GetObjectSize(), sizeof(mirror::DexCache)); 350 351 // Setup the primitive array type classes - can't be done until Object has a vtable. 352 SetClassRoot(kBooleanArrayClass, FindSystemClass("[Z")); 353 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 354 355 SetClassRoot(kByteArrayClass, FindSystemClass("[B")); 356 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 357 358 mirror::Class* found_char_array_class = FindSystemClass("[C"); 359 CHECK_EQ(char_array_class.get(), found_char_array_class); 360 361 SetClassRoot(kShortArrayClass, FindSystemClass("[S")); 362 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 363 364 mirror::Class* found_int_array_class = FindSystemClass("[I"); 365 CHECK_EQ(int_array_class.get(), found_int_array_class); 366 367 SetClassRoot(kLongArrayClass, FindSystemClass("[J")); 368 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 369 370 SetClassRoot(kFloatArrayClass, FindSystemClass("[F")); 371 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 372 373 SetClassRoot(kDoubleArrayClass, FindSystemClass("[D")); 374 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 375 376 mirror::Class* found_class_array_class = FindSystemClass("[Ljava/lang/Class;"); 377 CHECK_EQ(class_array_class.get(), found_class_array_class); 378 379 mirror::Class* found_object_array_class = FindSystemClass("[Ljava/lang/Object;"); 380 CHECK_EQ(object_array_class.get(), found_object_array_class); 381 382 // Setup the single, global copy of "iftable". 383 mirror::Class* java_lang_Cloneable = FindSystemClass("Ljava/lang/Cloneable;"); 384 CHECK(java_lang_Cloneable != NULL); 385 mirror::Class* java_io_Serializable = FindSystemClass("Ljava/io/Serializable;"); 386 CHECK(java_io_Serializable != NULL); 387 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 388 // crawl up and explicitly list all of the supers as well. 389 array_iftable_->SetInterface(0, java_lang_Cloneable); 390 array_iftable_->SetInterface(1, java_io_Serializable); 391 392 // Sanity check Class[] and Object[]'s interfaces. 393 ClassHelper kh(class_array_class.get()); 394 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 395 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 396 kh.ChangeClass(object_array_class.get()); 397 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 398 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 399 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 400 // dex_cache_ fields and register them in class_table_. 401 mirror::Class* Class_class = FindSystemClass("Ljava/lang/Class;"); 402 CHECK_EQ(java_lang_Class.get(), Class_class); 403 404 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 405 mirror::Class* Art_method_class = FindSystemClass("Ljava/lang/reflect/ArtMethod;"); 406 CHECK_EQ(java_lang_reflect_ArtMethod.get(), Art_method_class); 407 408 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 409 mirror::Class* Art_field_class = FindSystemClass("Ljava/lang/reflect/ArtField;"); 410 CHECK_EQ(java_lang_reflect_ArtField.get(), Art_field_class); 411 412 mirror::Class* String_array_class = FindSystemClass(class_roots_descriptors_[kJavaLangStringArrayClass]); 413 CHECK_EQ(object_array_string.get(), String_array_class); 414 415 mirror::Class* Art_method_array_class = 416 FindSystemClass(class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 417 CHECK_EQ(object_array_art_method.get(), Art_method_array_class); 418 419 mirror::Class* Art_field_array_class = 420 FindSystemClass(class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 421 CHECK_EQ(object_array_art_field.get(), Art_field_array_class); 422 423 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 424 425 // Create java.lang.reflect.Proxy root. 426 mirror::Class* java_lang_reflect_Proxy = FindSystemClass("Ljava/lang/reflect/Proxy;"); 427 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 428 429 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 430 mirror::Class* java_lang_ref_Reference = FindSystemClass("Ljava/lang/ref/Reference;"); 431 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference); 432 mirror::Class* java_lang_ref_FinalizerReference = FindSystemClass("Ljava/lang/ref/FinalizerReference;"); 433 java_lang_ref_FinalizerReference->SetAccessFlags( 434 java_lang_ref_FinalizerReference->GetAccessFlags() | 435 kAccClassIsReference | kAccClassIsFinalizerReference); 436 mirror::Class* java_lang_ref_PhantomReference = FindSystemClass("Ljava/lang/ref/PhantomReference;"); 437 java_lang_ref_PhantomReference->SetAccessFlags( 438 java_lang_ref_PhantomReference->GetAccessFlags() | 439 kAccClassIsReference | kAccClassIsPhantomReference); 440 mirror::Class* java_lang_ref_SoftReference = FindSystemClass("Ljava/lang/ref/SoftReference;"); 441 java_lang_ref_SoftReference->SetAccessFlags( 442 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 443 mirror::Class* java_lang_ref_WeakReference = FindSystemClass("Ljava/lang/ref/WeakReference;"); 444 java_lang_ref_WeakReference->SetAccessFlags( 445 java_lang_ref_WeakReference->GetAccessFlags() | 446 kAccClassIsReference | kAccClassIsWeakReference); 447 448 // Setup the ClassLoader, verifying the object_size_. 449 mirror::Class* java_lang_ClassLoader = FindSystemClass("Ljava/lang/ClassLoader;"); 450 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), sizeof(mirror::ClassLoader)); 451 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 452 453 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 454 // java.lang.StackTraceElement as a convenience. 455 SetClassRoot(kJavaLangThrowable, FindSystemClass("Ljava/lang/Throwable;")); 456 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 457 SetClassRoot(kJavaLangClassNotFoundException, FindSystemClass("Ljava/lang/ClassNotFoundException;")); 458 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass("Ljava/lang/StackTraceElement;")); 459 SetClassRoot(kJavaLangStackTraceElementArrayClass, FindSystemClass("[Ljava/lang/StackTraceElement;")); 460 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 461 462 FinishInit(); 463 464 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 465} 466 467void ClassLinker::FinishInit() { 468 VLOG(startup) << "ClassLinker::FinishInit entering"; 469 470 // Let the heap know some key offsets into java.lang.ref instances 471 // Note: we hard code the field indexes here rather than using FindInstanceField 472 // as the types of the field can't be resolved prior to the runtime being 473 // fully initialized 474 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 475 mirror::Class* java_lang_ref_FinalizerReference = 476 FindSystemClass("Ljava/lang/ref/FinalizerReference;"); 477 478 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 479 FieldHelper fh(pendingNext); 480 CHECK_STREQ(fh.GetName(), "pendingNext"); 481 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 482 483 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 484 fh.ChangeField(queue); 485 CHECK_STREQ(fh.GetName(), "queue"); 486 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 487 488 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 489 fh.ChangeField(queueNext); 490 CHECK_STREQ(fh.GetName(), "queueNext"); 491 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 492 493 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 494 fh.ChangeField(referent); 495 CHECK_STREQ(fh.GetName(), "referent"); 496 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 497 498 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 499 fh.ChangeField(zombie); 500 CHECK_STREQ(fh.GetName(), "zombie"); 501 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 502 503 gc::Heap* heap = Runtime::Current()->GetHeap(); 504 heap->SetReferenceOffsets(referent->GetOffset(), 505 queue->GetOffset(), 506 queueNext->GetOffset(), 507 pendingNext->GetOffset(), 508 zombie->GetOffset()); 509 510 // ensure all class_roots_ are initialized 511 for (size_t i = 0; i < kClassRootsMax; i++) { 512 ClassRoot class_root = static_cast<ClassRoot>(i); 513 mirror::Class* klass = GetClassRoot(class_root); 514 CHECK(klass != NULL); 515 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 516 // note SetClassRoot does additional validation. 517 // if possible add new checks there to catch errors early 518 } 519 520 CHECK(array_iftable_ != NULL); 521 522 // disable the slow paths in FindClass and CreatePrimitiveClass now 523 // that Object, Class, and Object[] are setup 524 init_done_ = true; 525 526 VLOG(startup) << "ClassLinker::FinishInit exiting"; 527} 528 529void ClassLinker::RunRootClinits() { 530 Thread* self = Thread::Current(); 531 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 532 mirror::Class* c = GetClassRoot(ClassRoot(i)); 533 if (!c->IsArrayClass() && !c->IsPrimitive()) { 534 SirtRef<mirror::Class> sirt_class(self, GetClassRoot(ClassRoot(i))); 535 EnsureInitialized(sirt_class, true, true); 536 self->AssertNoPendingException(); 537 } 538 } 539} 540 541bool ClassLinker::GenerateOatFile(const char* dex_filename, 542 int oat_fd, 543 const char* oat_cache_filename, 544 std::string* error_msg) { 545 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 546 std::string dex2oat_string(GetAndroidRoot()); 547 dex2oat_string += (kIsDebugBuild ? "/bin/dex2oatd" : "/bin/dex2oat"); 548 const char* dex2oat = dex2oat_string.c_str(); 549 550 const char* class_path = Runtime::Current()->GetClassPathString().c_str(); 551 552 gc::Heap* heap = Runtime::Current()->GetHeap(); 553 std::string boot_image_option_string("--boot-image="); 554 boot_image_option_string += heap->GetImageSpace()->GetImageFilename(); 555 const char* boot_image_option = boot_image_option_string.c_str(); 556 557 std::string dex_file_option_string("--dex-file="); 558 dex_file_option_string += dex_filename; 559 const char* dex_file_option = dex_file_option_string.c_str(); 560 561 std::string oat_fd_option_string("--oat-fd="); 562 StringAppendF(&oat_fd_option_string, "%d", oat_fd); 563 const char* oat_fd_option = oat_fd_option_string.c_str(); 564 565 std::string oat_location_option_string("--oat-location="); 566 oat_location_option_string += oat_cache_filename; 567 const char* oat_location_option = oat_location_option_string.c_str(); 568 569 std::string oat_compiler_filter_string("-compiler-filter:"); 570 Runtime::CompilerFilter filter = Runtime::Current()->GetCompilerFilter(); 571 switch (filter) { 572 case Runtime::kInterpretOnly: 573 oat_compiler_filter_string += "interpret-only"; 574 break; 575 case Runtime::kSpace: 576 oat_compiler_filter_string += "space"; 577 break; 578 case Runtime::kBalanced: 579 oat_compiler_filter_string += "balanced"; 580 break; 581 case Runtime::kSpeed: 582 oat_compiler_filter_string += "speed"; 583 break; 584 case Runtime::kEverything: 585 oat_compiler_filter_string += "everything"; 586 break; 587 default: 588 LOG(FATAL) << "Unexpected case: " << filter; 589 } 590 const char* oat_compiler_filter_option = oat_compiler_filter_string.c_str(); 591 592 // fork and exec dex2oat 593 pid_t pid = fork(); 594 if (pid == 0) { 595 // no allocation allowed between fork and exec 596 597 // change process groups, so we don't get reaped by ProcessManager 598 setpgid(0, 0); 599 600 // gLogVerbosity.class_linker = true; 601 VLOG(class_linker) << dex2oat 602 << " --runtime-arg -Xms64m" 603 << " --runtime-arg -Xmx64m" 604 << " --runtime-arg -classpath" 605 << " --runtime-arg " << class_path 606 << " --runtime-arg " << oat_compiler_filter_option 607#if !defined(ART_TARGET) 608 << " --host" 609#endif 610 << " " << boot_image_option 611 << " " << dex_file_option 612 << " " << oat_fd_option 613 << " " << oat_location_option; 614 615 execl(dex2oat, dex2oat, 616 "--runtime-arg", "-Xms64m", 617 "--runtime-arg", "-Xmx64m", 618 "--runtime-arg", "-classpath", 619 "--runtime-arg", class_path, 620 "--runtime-arg", oat_compiler_filter_option, 621#if !defined(ART_TARGET) 622 "--host", 623#endif 624 boot_image_option, 625 dex_file_option, 626 oat_fd_option, 627 oat_location_option, 628 NULL); 629 630 PLOG(FATAL) << "execl(" << dex2oat << ") failed"; 631 return false; 632 } else { 633 // wait for dex2oat to finish 634 int status; 635 pid_t got_pid = TEMP_FAILURE_RETRY(waitpid(pid, &status, 0)); 636 if (got_pid != pid) { 637 *error_msg = StringPrintf("Failed to create oat file. Waitpid failed: wanted %d, got %d", 638 pid, got_pid); 639 return false; 640 } 641 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { 642 *error_msg = StringPrintf("Failed to create oat file. %s failed with dex-file '%s'", 643 dex2oat, dex_filename); 644 return false; 645 } 646 } 647 return true; 648} 649 650const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 651 WriterMutexLock mu(Thread::Current(), dex_lock_); 652 for (size_t i = 0; i < oat_files_.size(); ++i) { 653 if (UNLIKELY(oat_file->GetLocation() == oat_files_[i]->GetLocation())) { 654 VLOG(class_linker) << "Attempt to register oat file that's already registered: " 655 << oat_file->GetLocation(); 656 for (size_t j = i; j < oat_files_.size(); ++j) { 657 CHECK_NE(oat_file, oat_files_[j]) << "Attempt to re-register dex file."; 658 } 659 delete oat_file; 660 return oat_files_[i]; 661 } 662 } 663 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 664 oat_files_.push_back(oat_file); 665 return oat_file; 666} 667 668OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 669 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 670 OatFile* oat_file = space->ReleaseOatFile(); 671 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 672 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 673 return *oat_file; 674} 675 676const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 677 const char* dex_location = dex_file.GetLocation().c_str(); 678 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 679 return FindOpenedOatFileFromDexLocation(dex_location, &dex_location_checksum); 680} 681 682const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation(const char* dex_location, 683 const uint32_t* const dex_location_checksum) { 684 ReaderMutexLock mu(Thread::Current(), dex_lock_); 685 for (size_t i = 0; i < oat_files_.size(); i++) { 686 const OatFile* oat_file = oat_files_[i]; 687 DCHECK(oat_file != NULL); 688 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 689 dex_location_checksum, 690 false); 691 if (oat_dex_file != NULL) { 692 return oat_file; 693 } 694 } 695 return NULL; 696} 697 698const DexFile* ClassLinker::FindDexFileInOatLocation(const char* dex_location, 699 uint32_t dex_location_checksum, 700 const char* oat_location, 701 std::string* error_msg) { 702 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 703 !Runtime::Current()->IsCompiler(), 704 error_msg)); 705 if (oat_file.get() == nullptr) { 706 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 707 error_msg->c_str()); 708 return nullptr; 709 } 710 Runtime* runtime = Runtime::Current(); 711 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 712 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 713 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 714 if (expected_image_oat_checksum != actual_image_oat_checksum) { 715 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 716 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 717 actual_image_oat_checksum); 718 return nullptr; 719 } 720 721 uint32_t expected_image_oat_offset = reinterpret_cast<uint32_t>(image_header.GetOatDataBegin()); 722 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 723 if (expected_image_oat_offset != actual_image_oat_offset) { 724 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %ud, " 725 "found %ud", oat_location, expected_image_oat_offset, 726 actual_image_oat_offset); 727 return nullptr; 728 } 729 // TODO: this registers the oat file now as we may use the oat_dex_file later and we want the 730 // intern behavior of RegisterOatFile. However, if we take an early return we could remove 731 // the oat file. 732 const OatFile* opened_oat_file = RegisterOatFile(oat_file.release()); 733 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, 734 &dex_location_checksum); 735 if (oat_dex_file == nullptr) { 736 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 737 dex_location); 738 return nullptr; 739 } 740 uint32_t expected_dex_checksum = dex_location_checksum; 741 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 742 if (expected_dex_checksum != actual_dex_checksum) { 743 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 744 "found 0x%x", oat_location, expected_dex_checksum, 745 actual_dex_checksum); 746 return nullptr; 747 } 748 return oat_dex_file->OpenDexFile(error_msg); 749} 750 751class ScopedFlock { 752 public: 753 ScopedFlock() {} 754 755 bool Init(const char* filename, std::string* error_msg) { 756 while (true) { 757 file_.reset(OS::OpenFileWithFlags(filename, O_CREAT | O_RDWR)); 758 if (file_.get() == NULL) { 759 *error_msg = StringPrintf("Failed to open file '%s'", filename); 760 return false; 761 } 762 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_EX)); 763 if (flock_result != 0) { 764 *error_msg = StringPrintf("Failed to lock file '%s': %s", filename, strerror(errno)); 765 return false; 766 } 767 struct stat fstat_stat; 768 int fstat_result = TEMP_FAILURE_RETRY(fstat(file_->Fd(), &fstat_stat)); 769 if (fstat_result != 0) { 770 *error_msg = StringPrintf("Failed to fstat file '%s': %s", filename, strerror(errno)); 771 return false; 772 } 773 struct stat stat_stat; 774 int stat_result = TEMP_FAILURE_RETRY(stat(filename, &stat_stat)); 775 if (stat_result != 0) { 776 PLOG(WARNING) << "Failed to stat, will retry: " << filename; 777 // ENOENT can happen if someone racing with us unlinks the file we created so just retry. 778 continue; 779 } 780 if (fstat_stat.st_dev != stat_stat.st_dev || fstat_stat.st_ino != stat_stat.st_ino) { 781 LOG(WARNING) << "File changed while locking, will retry: " << filename; 782 continue; 783 } 784 return true; 785 } 786 } 787 788 File& GetFile() { 789 return *file_; 790 } 791 792 ~ScopedFlock() { 793 if (file_.get() != NULL) { 794 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_UN)); 795 CHECK_EQ(0, flock_result); 796 } 797 } 798 799 private: 800 UniquePtr<File> file_; 801 802 DISALLOW_COPY_AND_ASSIGN(ScopedFlock); 803}; 804 805const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation(const char* dex_location, 806 uint32_t dex_location_checksum, 807 const char* oat_location, 808 std::string* error_msg) { 809 // We play a locking game here so that if two different processes 810 // race to generate (or worse, one tries to open a partial generated 811 // file) we will be okay. This is actually common with apps that use 812 // DexClassLoader to work around the dex method reference limit and 813 // that have a background service running in a separate process. 814 ScopedFlock scoped_flock; 815 if (!scoped_flock.Init(oat_location, error_msg)) { 816 return nullptr; 817 } 818 819 // Check if we already have an up-to-date output file 820 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, dex_location_checksum, 821 oat_location, error_msg); 822 if (dex_file != nullptr) { 823 return dex_file; 824 } 825 VLOG(class_linker) << "Failed to find dex file '" << dex_location << "' in oat location '" 826 << oat_location << "': " << *error_msg; 827 error_msg->clear(); 828 829 { 830 // We might have registered an outdated OatFile in FindDexFileInOatLocation(). 831 // Get rid of it as its MAP_PRIVATE mapping may not reflect changes we're about to do. 832 WriterMutexLock mu(Thread::Current(), dex_lock_); 833 for (size_t i = 0; i < oat_files_.size(); ++i) { 834 if (oat_location == oat_files_[i]->GetLocation()) { 835 VLOG(class_linker) << "De-registering old OatFile: " << oat_location; 836 delete oat_files_[i]; 837 oat_files_.erase(oat_files_.begin() + i); 838 break; 839 } 840 } 841 } 842 843 // Generate the output oat file for the dex file 844 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 845 if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location, error_msg)) { 846 CHECK(!error_msg->empty()); 847 return nullptr; 848 } 849 const OatFile* oat_file = OatFile::Open(oat_location, oat_location, NULL, 850 !Runtime::Current()->IsCompiler(), 851 error_msg); 852 if (oat_file == nullptr) { 853 *error_msg = StringPrintf("Failed to open generated oat file '%s': %s", 854 oat_location, error_msg->c_str()); 855 return nullptr; 856 } 857 oat_file = RegisterOatFile(oat_file); 858 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 859 &dex_location_checksum); 860 if (oat_dex_file == nullptr) { 861 *error_msg = StringPrintf("Failed to find dex file '%s' (checksum 0x%x) in generated out file " 862 "'%s'", dex_location, dex_location_checksum, oat_location); 863 return nullptr; 864 } 865 const DexFile* result = oat_dex_file->OpenDexFile(error_msg); 866 CHECK(result != nullptr) << *error_msg; 867 CHECK_EQ(dex_location_checksum, result->GetLocationChecksum()) 868 << "dex_location=" << dex_location << " oat_location=" << oat_location << std::hex 869 << " dex_location_checksum=" << dex_location_checksum 870 << " DexFile::GetLocationChecksum()=" << result->GetLocationChecksum(); 871 return result; 872} 873 874bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 875 const char* dex_location, 876 uint32_t dex_location_checksum, 877 std::string* error_msg) { 878 Runtime* runtime = Runtime::Current(); 879 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 880 uint32_t image_oat_checksum = image_header.GetOatChecksum(); 881 uint32_t image_oat_data_begin = reinterpret_cast<uint32_t>(image_header.GetOatDataBegin()); 882 bool image_check = ((oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum) 883 && (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 884 885 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 886 if (oat_dex_file == NULL) { 887 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 888 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 889 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 890 for (size_t i = 0; i < oat_dex_files.size(); i++) { 891 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 892 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 893 oat_file->GetLocation().c_str(), 894 oat_dex_file->GetDexFileLocation().c_str()); 895 } 896 return false; 897 } 898 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 899 900 if (image_check && dex_check) { 901 return true; 902 } 903 904 if (!image_check) { 905 ScopedObjectAccess soa(Thread::Current()); 906 mirror::String* oat_location = image_header.GetImageRoot(ImageHeader::kOatLocation)->AsString(); 907 std::string image_file(oat_location->ToModifiedUtf8()); 908 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with '%s' (0x%x, %d)", 909 oat_file->GetLocation().c_str(), 910 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 911 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 912 image_file.c_str(), image_oat_checksum, image_oat_data_begin); 913 } 914 if (!dex_check) { 915 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 916 oat_file->GetLocation().c_str(), 917 oat_dex_file->GetDexFileLocationChecksum(), 918 dex_location, dex_location_checksum); 919 } 920 return false; 921} 922 923const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const std::string& oat_file_location, 924 const char* dex_location, 925 std::string* error_msg, 926 bool* open_failed) { 927 UniquePtr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 928 if (oat_file.get() == nullptr) { 929 *open_failed = true; 930 return nullptr; 931 } 932 *open_failed = false; 933 uint32_t dex_location_checksum; 934 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 935 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 936 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 937 // directory. 938 const OatFile* opened_oat_file = oat_file.release(); 939 opened_oat_file = RegisterOatFile(opened_oat_file); 940 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, NULL); 941 if (oat_dex_file == nullptr) { 942 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 943 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 944 error_msg->c_str()); 945 return nullptr; 946 } 947 return oat_dex_file->OpenDexFile(error_msg); 948 } 949 950 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 951 error_msg); 952 if (!verified) { 953 return nullptr; 954 } 955 const OatFile* opened_oat_file = oat_file.release(); 956 opened_oat_file = RegisterOatFile(opened_oat_file); 957 return opened_oat_file->GetOatDexFile(dex_location, 958 &dex_location_checksum)->OpenDexFile(error_msg); 959} 960 961const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const char* dex_location, 962 const uint32_t* const dex_location_checksum, 963 std::string* error_msg) { 964 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location, 965 dex_location_checksum); 966 if (open_oat_file != nullptr) { 967 const OatFile::OatDexFile* oat_dex_file = open_oat_file->GetOatDexFile(dex_location, 968 dex_location_checksum); 969 return oat_dex_file->OpenDexFile(error_msg); 970 } 971 972 // Look for an existing file next to dex. for example, for 973 // /foo/bar/baz.jar, look for /foo/bar/baz.odex. 974 std::string odex_filename(OatFile::DexFilenameToOdexFilename(dex_location)); 975 bool open_failed; 976 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(odex_filename, dex_location, 977 error_msg, &open_failed); 978 if (dex_file != nullptr) { 979 return dex_file; 980 } 981 if (dex_location_checksum == nullptr) { 982 *error_msg = StringPrintf("Failed to open oat file from %s and no classes.dex found in %s: %s", 983 odex_filename.c_str(), dex_location, error_msg->c_str()); 984 return nullptr; 985 } 986 987 std::string cache_error_msg; 988 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location)); 989 dex_file = VerifyAndOpenDexFileFromOatFile(cache_location, dex_location, &cache_error_msg, 990 &open_failed); 991 if (dex_file != nullptr) { 992 return dex_file; 993 } 994 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 995 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 996 } 997 VLOG(class_linker) << "Failed to open oat file from " << odex_filename 998 << " (error '" << *error_msg << "') or " << cache_location 999 << " (error '" << cache_error_msg << "')."; 1000 1001 // Try to generate oat file if it wasn't found or was obsolete. 1002 error_msg->clear(); 1003 return FindOrCreateOatFileForDexLocation(dex_location, *dex_location_checksum, 1004 cache_location.c_str(), error_msg); 1005} 1006 1007const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1008 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1009 for (size_t i = 0; i < oat_files_.size(); i++) { 1010 const OatFile* oat_file = oat_files_[i]; 1011 DCHECK(oat_file != nullptr); 1012 if (oat_file->GetLocation() == oat_location) { 1013 return oat_file; 1014 } 1015 } 1016 return nullptr; 1017} 1018 1019const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1020 std::string* error_msg) { 1021 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1022 if (oat_file != nullptr) { 1023 return oat_file; 1024 } 1025 1026 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1027 error_msg); 1028 if (oat_file == NULL) { 1029 return NULL; 1030 } 1031 return oat_file; 1032} 1033 1034static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1035 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1036 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1037 1038 DCHECK(obj != NULL); 1039 DCHECK(class_linker != NULL); 1040 1041 if (obj->IsArtMethod()) { 1042 mirror::ArtMethod* method = obj->AsArtMethod(); 1043 if (!method->IsNative()) { 1044 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1045 if (method != Runtime::Current()->GetResolutionMethod()) { 1046 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1047 } 1048 } 1049 } 1050} 1051 1052void ClassLinker::InitFromImage() { 1053 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1054 CHECK(!init_done_); 1055 1056 Thread* self = Thread::Current(); 1057 gc::Heap* heap = Runtime::Current()->GetHeap(); 1058 gc::space::ImageSpace* space = heap->GetImageSpace(); 1059 dex_cache_image_class_lookup_required_ = true; 1060 CHECK(space != NULL); 1061 OatFile& oat_file = GetImageOatFile(space); 1062 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1063 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1064 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 1065 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1066 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1067 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1068 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1069 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1070 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1071 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1072 1073 SirtRef<mirror::ObjectArray<mirror::Class> > class_roots( 1074 self, 1075 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>()); 1076 class_roots_ = class_roots.get(); 1077 1078 // Special case of setting up the String class early so that we can test arbitrary objects 1079 // as being Strings or not 1080 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1081 1082 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1083 static_cast<uint32_t>(dex_caches->GetLength())); 1084 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1085 SirtRef<mirror::DexCache> dex_cache(self, dex_caches->Get(i)); 1086 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1087 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1088 nullptr); 1089 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1090 std::string error_msg; 1091 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1092 if (dex_file == NULL) { 1093 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1094 << " from within oat file " << oat_file.GetLocation() 1095 << " error '" << error_msg << "'"; 1096 } 1097 1098 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1099 1100 AppendToBootClassPath(*dex_file, dex_cache); 1101 } 1102 1103 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1104 // bitmap walk. 1105 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1106 1107 // Set entry point to interpreter if in InterpretOnly mode. 1108 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1109 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1110 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1111 } 1112 1113 // reinit class_roots_ 1114 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1115 class_roots_ = class_roots.get(); 1116 1117 // reinit array_iftable_ from any array class instance, they should be == 1118 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1119 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1120 // String class root was set above 1121 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1122 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1123 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1124 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1125 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1126 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1127 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1128 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1129 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1130 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1131 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1132 1133 FinishInit(); 1134 1135 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1136} 1137 1138// Keep in sync with InitCallback. Anything we visit, we need to 1139// reinit references to when reinitializing a ClassLinker from a 1140// mapped image. 1141void ClassLinker::VisitRoots(RootVisitor* visitor, void* arg, bool only_dirty, bool clean_dirty) { 1142 class_roots_ = down_cast<mirror::ObjectArray<mirror::Class>*>(visitor(class_roots_, arg)); 1143 Thread* self = Thread::Current(); 1144 { 1145 ReaderMutexLock mu(self, dex_lock_); 1146 if (!only_dirty || dex_caches_dirty_) { 1147 for (mirror::DexCache*& dex_cache : dex_caches_) { 1148 dex_cache = down_cast<mirror::DexCache*>(visitor(dex_cache, arg)); 1149 DCHECK(dex_cache != nullptr); 1150 } 1151 if (clean_dirty) { 1152 dex_caches_dirty_ = false; 1153 } 1154 } 1155 } 1156 1157 { 1158 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 1159 if (!only_dirty || class_table_dirty_) { 1160 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1161 it.second = down_cast<mirror::Class*>(visitor(it.second, arg)); 1162 DCHECK(it.second != nullptr); 1163 } 1164 if (clean_dirty) { 1165 class_table_dirty_ = false; 1166 } 1167 } 1168 1169 // We deliberately ignore the class roots in the image since we 1170 // handle image roots by using the MS/CMS rescanning of dirty cards. 1171 } 1172 1173 array_iftable_ = reinterpret_cast<mirror::IfTable*>(visitor(array_iftable_, arg)); 1174 DCHECK(array_iftable_ != nullptr); 1175} 1176 1177void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1178 if (dex_cache_image_class_lookup_required_) { 1179 MoveImageClassesToClassTable(); 1180 } 1181 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1182 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 1183 if (!visitor(it.second, arg)) { 1184 return; 1185 } 1186 } 1187} 1188 1189static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1190 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1191 classes->insert(c); 1192 return true; 1193} 1194 1195void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1196 std::set<mirror::Class*> classes; 1197 VisitClasses(GetClassesVisitor, &classes); 1198 for (mirror::Class* klass : classes) { 1199 if (!visitor(klass, arg)) { 1200 return; 1201 } 1202 } 1203} 1204 1205ClassLinker::~ClassLinker() { 1206 mirror::Class::ResetClass(); 1207 mirror::String::ResetClass(); 1208 mirror::ArtField::ResetClass(); 1209 mirror::ArtMethod::ResetClass(); 1210 mirror::BooleanArray::ResetArrayClass(); 1211 mirror::ByteArray::ResetArrayClass(); 1212 mirror::CharArray::ResetArrayClass(); 1213 mirror::DoubleArray::ResetArrayClass(); 1214 mirror::FloatArray::ResetArrayClass(); 1215 mirror::IntArray::ResetArrayClass(); 1216 mirror::LongArray::ResetArrayClass(); 1217 mirror::ShortArray::ResetArrayClass(); 1218 mirror::Throwable::ResetClass(); 1219 mirror::StackTraceElement::ResetClass(); 1220 STLDeleteElements(&boot_class_path_); 1221 STLDeleteElements(&oat_files_); 1222} 1223 1224mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1225 gc::Heap* heap = Runtime::Current()->GetHeap(); 1226 SirtRef<mirror::Class> dex_cache_class(self, GetClassRoot(kJavaLangDexCache)); 1227 SirtRef<mirror::DexCache> dex_cache( 1228 self, down_cast<mirror::DexCache*>( 1229 heap->AllocObject<true>(self, dex_cache_class.get(), dex_cache_class->GetObjectSize()))); 1230 if (dex_cache.get() == NULL) { 1231 return NULL; 1232 } 1233 SirtRef<mirror::String> 1234 location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str())); 1235 if (location.get() == NULL) { 1236 return NULL; 1237 } 1238 SirtRef<mirror::ObjectArray<mirror::String> > 1239 strings(self, AllocStringArray(self, dex_file.NumStringIds())); 1240 if (strings.get() == NULL) { 1241 return NULL; 1242 } 1243 SirtRef<mirror::ObjectArray<mirror::Class> > 1244 types(self, AllocClassArray(self, dex_file.NumTypeIds())); 1245 if (types.get() == NULL) { 1246 return NULL; 1247 } 1248 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 1249 methods(self, AllocArtMethodArray(self, dex_file.NumMethodIds())); 1250 if (methods.get() == NULL) { 1251 return NULL; 1252 } 1253 SirtRef<mirror::ObjectArray<mirror::ArtField> > 1254 fields(self, AllocArtFieldArray(self, dex_file.NumFieldIds())); 1255 if (fields.get() == NULL) { 1256 return NULL; 1257 } 1258 dex_cache->Init(&dex_file, location.get(), strings.get(), types.get(), methods.get(), 1259 fields.get()); 1260 return dex_cache.get(); 1261} 1262 1263mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1264 size_t class_size) { 1265 DCHECK_GE(class_size, sizeof(mirror::Class)); 1266 gc::Heap* heap = Runtime::Current()->GetHeap(); 1267 mirror::Object* k = 1268 kMovingClasses ? 1269 heap->AllocObject<true>(self, java_lang_Class, class_size) : 1270 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size); 1271 if (UNLIKELY(k == NULL)) { 1272 CHECK(self->IsExceptionPending()); // OOME. 1273 return NULL; 1274 } 1275 mirror::Class* klass = k->AsClass(); 1276 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1277 klass->SetClassSize(class_size); 1278 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1279 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1280 return klass; 1281} 1282 1283mirror::Class* ClassLinker::AllocClass(Thread* self, size_t class_size) { 1284 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1285} 1286 1287mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1288 return down_cast<mirror::ArtField*>( 1289 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1290} 1291 1292mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1293 return down_cast<mirror::ArtMethod*>( 1294 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1295} 1296 1297mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1298 Thread* self, size_t length) { 1299 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1300 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1301} 1302 1303static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1304 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1305 DCHECK(klass != NULL); 1306 // Wait for the class if it has not already been linked. 1307 if (!klass->IsResolved() && !klass->IsErroneous()) { 1308 SirtRef<mirror::Class> sirt_class(self, klass); 1309 ObjectLock<mirror::Class> lock(self, &sirt_class); 1310 // Check for circular dependencies between classes. 1311 if (!sirt_class->IsResolved() && sirt_class->GetClinitThreadId() == self->GetTid()) { 1312 ThrowClassCircularityError(sirt_class.get()); 1313 sirt_class->SetStatus(mirror::Class::kStatusError, self); 1314 return nullptr; 1315 } 1316 // Wait for the pending initialization to complete. 1317 while (!sirt_class->IsResolved() && !sirt_class->IsErroneous()) { 1318 lock.WaitIgnoringInterrupts(); 1319 } 1320 klass = sirt_class.get(); 1321 } 1322 if (klass->IsErroneous()) { 1323 ThrowEarlierClassFailure(klass); 1324 return nullptr; 1325 } 1326 // Return the loaded class. No exceptions should be pending. 1327 CHECK(klass->IsResolved()) << PrettyClass(klass); 1328 self->AssertNoPendingException(); 1329 return klass; 1330} 1331 1332bool ClassLinker::IsInBootClassPath(const char* descriptor) { 1333 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1334 return pair.second != NULL; 1335} 1336 1337mirror::Class* ClassLinker::FindSystemClass(const char* descriptor) { 1338 SirtRef<mirror::ClassLoader> class_loader(Thread::Current(), nullptr); 1339 return FindClass(descriptor, class_loader); 1340} 1341 1342mirror::Class* ClassLinker::FindClass(const char* descriptor, 1343 const SirtRef<mirror::ClassLoader>& class_loader) { 1344 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1345 Thread* self = Thread::Current(); 1346 DCHECK(self != NULL); 1347 self->AssertNoPendingException(); 1348 if (descriptor[1] == '\0') { 1349 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1350 // for primitive classes that aren't backed by dex files. 1351 return FindPrimitiveClass(descriptor[0]); 1352 } 1353 // Find the class in the loaded classes table. 1354 mirror::Class* klass = LookupClass(descriptor, class_loader.get()); 1355 if (klass != NULL) { 1356 return EnsureResolved(self, klass); 1357 } 1358 // Class is not yet loaded. 1359 if (descriptor[0] == '[') { 1360 return CreateArrayClass(descriptor, class_loader); 1361 } else if (class_loader.get() == nullptr) { 1362 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1363 if (pair.second != NULL) { 1364 SirtRef<mirror::ClassLoader> class_loader(self, nullptr); 1365 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1366 } 1367 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1368 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1369 // throw of a NoClassDefFoundError. 1370 if (IsInBootClassPath(descriptor)) { 1371 mirror::Class* system_class = FindSystemClass(descriptor); 1372 CHECK(system_class != NULL); 1373 return system_class; 1374 } 1375 // Next try the compile time class path. 1376 const std::vector<const DexFile*>* class_path; 1377 { 1378 ScopedObjectAccessUnchecked soa(self); 1379 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1380 soa.AddLocalReference<jobject>(class_loader.get())); 1381 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1382 } 1383 1384 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1385 if (pair.second != NULL) { 1386 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1387 } 1388 1389 } else { 1390 ScopedObjectAccessUnchecked soa(self->GetJniEnv()); 1391 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1392 soa.AddLocalReference<jobject>(class_loader.get())); 1393 std::string class_name_string(DescriptorToDot(descriptor)); 1394 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1395 { 1396 ScopedThreadStateChange tsc(self, kNative); 1397 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1398 soa.Env()->NewStringUTF(class_name_string.c_str())); 1399 if (class_name_object.get() == NULL) { 1400 return NULL; 1401 } 1402 CHECK(class_loader_object.get() != NULL); 1403 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1404 WellKnownClasses::java_lang_ClassLoader_loadClass, 1405 class_name_object.get())); 1406 } 1407 if (soa.Self()->IsExceptionPending()) { 1408 // If the ClassLoader threw, pass that exception up. 1409 return NULL; 1410 } else if (result.get() == NULL) { 1411 // broken loader - throw NPE to be compatible with Dalvik 1412 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1413 class_name_string.c_str()).c_str()); 1414 return NULL; 1415 } else { 1416 // success, return mirror::Class* 1417 return soa.Decode<mirror::Class*>(result.get()); 1418 } 1419 } 1420 1421 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1422 return NULL; 1423} 1424 1425mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1426 const SirtRef<mirror::ClassLoader>& class_loader, 1427 const DexFile& dex_file, 1428 const DexFile::ClassDef& dex_class_def) { 1429 Thread* self = Thread::Current(); 1430 SirtRef<mirror::Class> klass(self, NULL); 1431 // Load the class from the dex file. 1432 if (UNLIKELY(!init_done_)) { 1433 // finish up init of hand crafted class_roots_ 1434 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1435 klass.reset(GetClassRoot(kJavaLangObject)); 1436 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1437 klass.reset(GetClassRoot(kJavaLangClass)); 1438 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1439 klass.reset(GetClassRoot(kJavaLangString)); 1440 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1441 klass.reset(GetClassRoot(kJavaLangDexCache)); 1442 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1443 klass.reset(GetClassRoot(kJavaLangReflectArtField)); 1444 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1445 klass.reset(GetClassRoot(kJavaLangReflectArtMethod)); 1446 } else { 1447 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1448 } 1449 } else { 1450 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1451 } 1452 if (UNLIKELY(klass.get() == NULL)) { 1453 CHECK(self->IsExceptionPending()); // Expect an OOME. 1454 return NULL; 1455 } 1456 klass->SetDexCache(FindDexCache(dex_file)); 1457 LoadClass(dex_file, dex_class_def, klass, class_loader.get()); 1458 // Check for a pending exception during load 1459 if (self->IsExceptionPending()) { 1460 klass->SetStatus(mirror::Class::kStatusError, self); 1461 return NULL; 1462 } 1463 ObjectLock<mirror::Class> lock(self, &klass); 1464 klass->SetClinitThreadId(self->GetTid()); 1465 // Add the newly loaded class to the loaded classes table. 1466 mirror::Class* existing = InsertClass(descriptor, klass.get(), Hash(descriptor)); 1467 if (existing != NULL) { 1468 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1469 // this thread to block. 1470 return EnsureResolved(self, existing); 1471 } 1472 // Finish loading (if necessary) by finding parents 1473 CHECK(!klass->IsLoaded()); 1474 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1475 // Loading failed. 1476 klass->SetStatus(mirror::Class::kStatusError, self); 1477 return NULL; 1478 } 1479 CHECK(klass->IsLoaded()); 1480 // Link the class (if necessary) 1481 CHECK(!klass->IsResolved()); 1482 // TODO: Use fast jobjects? 1483 SirtRef<mirror::ObjectArray<mirror::Class> > interfaces(self, nullptr); 1484 if (!LinkClass(self, klass, interfaces)) { 1485 // Linking failed. 1486 klass->SetStatus(mirror::Class::kStatusError, self); 1487 return NULL; 1488 } 1489 CHECK(klass->IsResolved()); 1490 1491 /* 1492 * We send CLASS_PREPARE events to the debugger from here. The 1493 * definition of "preparation" is creating the static fields for a 1494 * class and initializing them to the standard default values, but not 1495 * executing any code (that comes later, during "initialization"). 1496 * 1497 * We did the static preparation in LinkClass. 1498 * 1499 * The class has been prepared and resolved but possibly not yet verified 1500 * at this point. 1501 */ 1502 Dbg::PostClassPrepare(klass.get()); 1503 1504 return klass.get(); 1505} 1506 1507// Precomputes size that will be needed for Class, matching LinkStaticFields 1508size_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1509 const DexFile::ClassDef& dex_class_def) { 1510 const byte* class_data = dex_file.GetClassData(dex_class_def); 1511 size_t num_ref = 0; 1512 size_t num_32 = 0; 1513 size_t num_64 = 0; 1514 if (class_data != NULL) { 1515 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1516 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1517 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1518 char c = descriptor[0]; 1519 if (c == 'L' || c == '[') { 1520 num_ref++; 1521 } else if (c == 'J' || c == 'D') { 1522 num_64++; 1523 } else { 1524 num_32++; 1525 } 1526 } 1527 } 1528 // start with generic class data 1529 size_t size = sizeof(mirror::Class); 1530 // follow with reference fields which must be contiguous at start 1531 size += (num_ref * sizeof(uint32_t)); 1532 // if there are 64-bit fields to add, make sure they are aligned 1533 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1534 if (num_32 != 0) { 1535 // use an available 32-bit field for padding 1536 num_32--; 1537 } 1538 size += sizeof(uint32_t); // either way, we are adding a word 1539 DCHECK_EQ(size, RoundUp(size, 8)); 1540 } 1541 // tack on any 64-bit fields now that alignment is assured 1542 size += (num_64 * sizeof(uint64_t)); 1543 // tack on any remaining 32-bit fields 1544 size += (num_32 * sizeof(uint32_t)); 1545 return size; 1546} 1547 1548const OatFile::OatClass* ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1549 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1550 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1551 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1552 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1553 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1554 &dex_location_checksum); 1555 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1556 const OatFile::OatClass* oat_class = oat_dex_file->GetOatClass(class_def_idx); 1557 CHECK(oat_class != NULL) << dex_file.GetLocation() << " " << class_def_idx; 1558 return oat_class; 1559} 1560 1561static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1562 uint32_t method_idx) { 1563 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1564 const byte* class_data = dex_file.GetClassData(class_def); 1565 CHECK(class_data != NULL); 1566 ClassDataItemIterator it(dex_file, class_data); 1567 // Skip fields 1568 while (it.HasNextStaticField()) { 1569 it.Next(); 1570 } 1571 while (it.HasNextInstanceField()) { 1572 it.Next(); 1573 } 1574 // Process methods 1575 size_t class_def_method_index = 0; 1576 while (it.HasNextDirectMethod()) { 1577 if (it.GetMemberIndex() == method_idx) { 1578 return class_def_method_index; 1579 } 1580 class_def_method_index++; 1581 it.Next(); 1582 } 1583 while (it.HasNextVirtualMethod()) { 1584 if (it.GetMemberIndex() == method_idx) { 1585 return class_def_method_index; 1586 } 1587 class_def_method_index++; 1588 it.Next(); 1589 } 1590 DCHECK(!it.HasNext()); 1591 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1592 return 0; 1593} 1594 1595const OatFile::OatMethod ClassLinker::GetOatMethodFor(const mirror::ArtMethod* method) { 1596 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1597 // method for direct methods (or virtual methods made direct). 1598 mirror::Class* declaring_class = method->GetDeclaringClass(); 1599 size_t oat_method_index; 1600 if (method->IsStatic() || method->IsDirect()) { 1601 // Simple case where the oat method index was stashed at load time. 1602 oat_method_index = method->GetMethodIndex(); 1603 } else { 1604 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1605 // by search for its position in the declared virtual methods. 1606 oat_method_index = declaring_class->NumDirectMethods(); 1607 size_t end = declaring_class->NumVirtualMethods(); 1608 bool found = false; 1609 for (size_t i = 0; i < end; i++) { 1610 if (declaring_class->GetVirtualMethod(i) == method) { 1611 found = true; 1612 break; 1613 } 1614 oat_method_index++; 1615 } 1616 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1617 } 1618 UniquePtr<const OatFile::OatClass> 1619 oat_class(GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1620 declaring_class->GetDexClassDefIndex())); 1621 CHECK(oat_class.get() != NULL); 1622 DCHECK_EQ(oat_method_index, 1623 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1624 method->GetDeclaringClass()->GetDexClassDefIndex(), 1625 method->GetDexMethodIndex())); 1626 1627 return oat_class->GetOatMethod(oat_method_index); 1628} 1629 1630// Special case to get oat code without overwriting a trampoline. 1631const void* ClassLinker::GetOatCodeFor(const mirror::ArtMethod* method) { 1632 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1633 if (method->IsProxyMethod()) { 1634#if !defined(ART_USE_PORTABLE_COMPILER) 1635 return reinterpret_cast<void*>(art_quick_proxy_invoke_handler); 1636#else 1637 return reinterpret_cast<void*>(art_portable_proxy_invoke_handler); 1638#endif 1639 } 1640 const void* result = GetOatMethodFor(method).GetCode(); 1641 if (result == NULL) { 1642 // No code? You must mean to go into the interpreter. 1643 result = GetCompiledCodeToInterpreterBridge(); 1644 } 1645 return result; 1646} 1647 1648const void* ClassLinker::GetOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1649 uint32_t method_idx) { 1650 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1651 CHECK(oat_class.get() != nullptr); 1652 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1653 return oat_class->GetOatMethod(oat_method_idx).GetCode(); 1654} 1655 1656// Returns true if the method must run with interpreter, false otherwise. 1657static bool NeedsInterpreter(const mirror::ArtMethod* method, const void* code) { 1658 if (code == NULL) { 1659 // No code: need interpreter. 1660 return true; 1661 } 1662#ifdef ART_SEA_IR_MODE 1663 ScopedObjectAccess soa(Thread::Current()); 1664 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1665 LOG(INFO) << "Found " << PrettyMethod(method); 1666 return false; 1667 } 1668#endif 1669 // If interpreter mode is enabled, every method (except native and proxy) must 1670 // be run with interpreter. 1671 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1672 !method->IsNative() && !method->IsProxyMethod(); 1673} 1674 1675void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1676 if (klass->NumDirectMethods() == 0) { 1677 return; // No direct methods => no static methods. 1678 } 1679 Runtime* runtime = Runtime::Current(); 1680 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1681 return; // OAT file unavailable. 1682 } 1683 ClassHelper kh(klass); 1684 const DexFile& dex_file = kh.GetDexFile(); 1685 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 1686 CHECK(dex_class_def != nullptr); 1687 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1688 // There should always be class data if there were direct methods. 1689 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1690 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1691 CHECK(oat_class.get() != nullptr); 1692 ClassDataItemIterator it(dex_file, class_data); 1693 // Skip fields 1694 while (it.HasNextStaticField()) { 1695 it.Next(); 1696 } 1697 while (it.HasNextInstanceField()) { 1698 it.Next(); 1699 } 1700 // Link the code of methods skipped by LinkCode. 1701 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1702 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1703 if (!method->IsStatic()) { 1704 // Only update static methods. 1705 continue; 1706 } 1707 const void* code = oat_class->GetOatMethod(method_index).GetCode(); 1708 const bool enter_interpreter = NeedsInterpreter(method, code); 1709 if (enter_interpreter) { 1710 // Use interpreter entry point. 1711 code = GetCompiledCodeToInterpreterBridge(); 1712 } 1713 runtime->GetInstrumentation()->UpdateMethodsCode(method, code); 1714 } 1715 // Ignore virtual methods on the iterator. 1716} 1717 1718static void LinkCode(const SirtRef<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class, 1719 uint32_t method_index) 1720 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1721 // Method shouldn't have already been linked. 1722 DCHECK(method->GetEntryPointFromCompiledCode() == NULL); 1723 // Every kind of method should at least get an invoke stub from the oat_method. 1724 // non-abstract methods also get their code pointers. 1725 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1726 oat_method.LinkMethod(method.get()); 1727 1728 // Install entry point from interpreter. 1729 Runtime* runtime = Runtime::Current(); 1730 bool enter_interpreter = NeedsInterpreter(method.get(), method->GetEntryPointFromCompiledCode()); 1731 if (enter_interpreter) { 1732 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1733 } else { 1734 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1735 } 1736 1737 if (method->IsAbstract()) { 1738 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1739 return; 1740 } 1741 1742 if (method->IsStatic() && !method->IsConstructor()) { 1743 // For static methods excluding the class initializer, install the trampoline. 1744 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1745 // after initializing class (see ClassLinker::InitializeClass method). 1746 method->SetEntryPointFromCompiledCode(GetResolutionTrampoline(runtime->GetClassLinker())); 1747 } else if (enter_interpreter) { 1748 // Set entry point from compiled code if there's no code or in interpreter only mode. 1749 method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge()); 1750 } 1751 1752 if (method->IsNative()) { 1753 // Unregistering restores the dlsym lookup stub. 1754 method->UnregisterNative(Thread::Current()); 1755 } 1756 1757 // Allow instrumentation its chance to hijack code. 1758 runtime->GetInstrumentation()->UpdateMethodsCode(method.get(), 1759 method->GetEntryPointFromCompiledCode()); 1760} 1761 1762void ClassLinker::LoadClass(const DexFile& dex_file, 1763 const DexFile::ClassDef& dex_class_def, 1764 const SirtRef<mirror::Class>& klass, 1765 mirror::ClassLoader* class_loader) { 1766 CHECK(klass.get() != NULL); 1767 CHECK(klass->GetDexCache() != NULL); 1768 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1769 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1770 CHECK(descriptor != NULL); 1771 1772 klass->SetClass(GetClassRoot(kJavaLangClass)); 1773 uint32_t access_flags = dex_class_def.access_flags_; 1774 // Make sure that none of our runtime-only flags are set. 1775 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1776 klass->SetAccessFlags(access_flags); 1777 klass->SetClassLoader(class_loader); 1778 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1779 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1780 1781 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1782 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1783 1784 // Load fields fields. 1785 const byte* class_data = dex_file.GetClassData(dex_class_def); 1786 if (class_data == NULL) { 1787 return; // no fields or methods - for example a marker interface 1788 } 1789 ClassDataItemIterator it(dex_file, class_data); 1790 Thread* self = Thread::Current(); 1791 if (it.NumStaticFields() != 0) { 1792 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1793 if (UNLIKELY(statics == NULL)) { 1794 CHECK(self->IsExceptionPending()); // OOME. 1795 return; 1796 } 1797 klass->SetSFields(statics); 1798 } 1799 if (it.NumInstanceFields() != 0) { 1800 mirror::ObjectArray<mirror::ArtField>* fields = 1801 AllocArtFieldArray(self, it.NumInstanceFields()); 1802 if (UNLIKELY(fields == NULL)) { 1803 CHECK(self->IsExceptionPending()); // OOME. 1804 return; 1805 } 1806 klass->SetIFields(fields); 1807 } 1808 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1809 SirtRef<mirror::ArtField> sfield(self, AllocArtField(self)); 1810 if (UNLIKELY(sfield.get() == NULL)) { 1811 CHECK(self->IsExceptionPending()); // OOME. 1812 return; 1813 } 1814 klass->SetStaticField(i, sfield.get()); 1815 LoadField(dex_file, it, klass, sfield); 1816 } 1817 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1818 SirtRef<mirror::ArtField> ifield(self, AllocArtField(self)); 1819 if (UNLIKELY(ifield.get() == NULL)) { 1820 CHECK(self->IsExceptionPending()); // OOME. 1821 return; 1822 } 1823 klass->SetInstanceField(i, ifield.get()); 1824 LoadField(dex_file, it, klass, ifield); 1825 } 1826 1827 UniquePtr<const OatFile::OatClass> oat_class; 1828 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1829 oat_class.reset(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1830 } 1831 1832 // Load methods. 1833 if (it.NumDirectMethods() != 0) { 1834 // TODO: append direct methods to class object 1835 mirror::ObjectArray<mirror::ArtMethod>* directs = 1836 AllocArtMethodArray(self, it.NumDirectMethods()); 1837 if (UNLIKELY(directs == NULL)) { 1838 CHECK(self->IsExceptionPending()); // OOME. 1839 return; 1840 } 1841 klass->SetDirectMethods(directs); 1842 } 1843 if (it.NumVirtualMethods() != 0) { 1844 // TODO: append direct methods to class object 1845 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1846 AllocArtMethodArray(self, it.NumVirtualMethods()); 1847 if (UNLIKELY(virtuals == NULL)) { 1848 CHECK(self->IsExceptionPending()); // OOME. 1849 return; 1850 } 1851 klass->SetVirtualMethods(virtuals); 1852 } 1853 size_t class_def_method_index = 0; 1854 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1855 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1856 if (UNLIKELY(method.get() == NULL)) { 1857 CHECK(self->IsExceptionPending()); // OOME. 1858 return; 1859 } 1860 klass->SetDirectMethod(i, method.get()); 1861 if (oat_class.get() != NULL) { 1862 LinkCode(method, oat_class.get(), class_def_method_index); 1863 } 1864 method->SetMethodIndex(class_def_method_index); 1865 class_def_method_index++; 1866 } 1867 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1868 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1869 if (UNLIKELY(method.get() == NULL)) { 1870 CHECK(self->IsExceptionPending()); // OOME. 1871 return; 1872 } 1873 klass->SetVirtualMethod(i, method.get()); 1874 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1875 if (oat_class.get() != NULL) { 1876 LinkCode(method, oat_class.get(), class_def_method_index); 1877 } 1878 class_def_method_index++; 1879 } 1880 DCHECK(!it.HasNext()); 1881} 1882 1883void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1884 const SirtRef<mirror::Class>& klass, 1885 const SirtRef<mirror::ArtField>& dst) { 1886 uint32_t field_idx = it.GetMemberIndex(); 1887 dst->SetDexFieldIndex(field_idx); 1888 dst->SetDeclaringClass(klass.get()); 1889 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1890} 1891 1892mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1893 const ClassDataItemIterator& it, 1894 const SirtRef<mirror::Class>& klass) { 1895 uint32_t dex_method_idx = it.GetMemberIndex(); 1896 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1897 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 1898 1899 mirror::ArtMethod* dst = AllocArtMethod(self); 1900 if (UNLIKELY(dst == NULL)) { 1901 CHECK(self->IsExceptionPending()); // OOME. 1902 return NULL; 1903 } 1904 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 1905 1906 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 1907 dst->SetDexMethodIndex(dex_method_idx); 1908 dst->SetDeclaringClass(klass.get()); 1909 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 1910 1911 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 1912 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 1913 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 1914 1915 uint32_t access_flags = it.GetMemberAccessFlags(); 1916 1917 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 1918 // Set finalizable flag on declaring class. 1919 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 1920 // Void return type. 1921 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 1922 klass->SetFinalizable(); 1923 } else { 1924 ClassHelper kh(klass.get()); 1925 const char* klass_descriptor = kh.GetDescriptor(); 1926 // The Enum class declares a "final" finalize() method to prevent subclasses from 1927 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 1928 // subclasses, so we exclude it here. 1929 // We also want to avoid setting the flag on Object, where we know that finalize() is 1930 // empty. 1931 if ((strcmp("Ljava/lang/Object;", klass_descriptor) != 0) && 1932 (strcmp("Ljava/lang/Enum;", klass_descriptor) != 0)) { 1933 klass->SetFinalizable(); 1934 } 1935 } 1936 } 1937 } else if (method_name[0] == '<') { 1938 // Fix broken access flags for initializers. Bug 11157540. 1939 bool is_init = (strcmp("<init>", method_name) == 0); 1940 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 1941 if (UNLIKELY(!is_init && !is_clinit)) { 1942 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 1943 } else { 1944 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 1945 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 1946 << PrettyDescriptor(klass.get()) << " in dex file " << dex_file.GetLocation(); 1947 access_flags |= kAccConstructor; 1948 } 1949 } 1950 } 1951 dst->SetAccessFlags(access_flags); 1952 1953 self->EndAssertNoThreadSuspension(old_cause); 1954 return dst; 1955} 1956 1957void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 1958 Thread* self = Thread::Current(); 1959 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 1960 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 1961 AppendToBootClassPath(dex_file, dex_cache); 1962} 1963 1964void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 1965 const SirtRef<mirror::DexCache>& dex_cache) { 1966 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1967 boot_class_path_.push_back(&dex_file); 1968 RegisterDexFile(dex_file, dex_cache); 1969} 1970 1971bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 1972 dex_lock_.AssertSharedHeld(Thread::Current()); 1973 for (size_t i = 0; i != dex_caches_.size(); ++i) { 1974 if (dex_caches_[i]->GetDexFile() == &dex_file) { 1975 return true; 1976 } 1977 } 1978 return false; 1979} 1980 1981bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 1982 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1983 return IsDexFileRegisteredLocked(dex_file); 1984} 1985 1986void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 1987 const SirtRef<mirror::DexCache>& dex_cache) { 1988 dex_lock_.AssertExclusiveHeld(Thread::Current()); 1989 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 1990 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 1991 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 1992 dex_caches_.push_back(dex_cache.get()); 1993 dex_cache->SetDexFile(&dex_file); 1994 dex_caches_dirty_ = true; 1995} 1996 1997void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 1998 Thread* self = Thread::Current(); 1999 { 2000 ReaderMutexLock mu(self, dex_lock_); 2001 if (IsDexFileRegisteredLocked(dex_file)) { 2002 return; 2003 } 2004 } 2005 // Don't alloc while holding the lock, since allocation may need to 2006 // suspend all threads and another thread may need the dex_lock_ to 2007 // get to a suspend point. 2008 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 2009 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2010 { 2011 WriterMutexLock mu(self, dex_lock_); 2012 if (IsDexFileRegisteredLocked(dex_file)) { 2013 return; 2014 } 2015 RegisterDexFileLocked(dex_file, dex_cache); 2016 } 2017} 2018 2019void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2020 const SirtRef<mirror::DexCache>& dex_cache) { 2021 WriterMutexLock mu(Thread::Current(), dex_lock_); 2022 RegisterDexFileLocked(dex_file, dex_cache); 2023} 2024 2025mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 2026 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2027 // Search assuming unique-ness of dex file. 2028 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2029 mirror::DexCache* dex_cache = dex_caches_[i]; 2030 if (dex_cache->GetDexFile() == &dex_file) { 2031 return dex_cache; 2032 } 2033 } 2034 // Search matching by location name. 2035 std::string location(dex_file.GetLocation()); 2036 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2037 mirror::DexCache* dex_cache = dex_caches_[i]; 2038 if (dex_cache->GetDexFile()->GetLocation() == location) { 2039 return dex_cache; 2040 } 2041 } 2042 // Failure, dump diagnostic and abort. 2043 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2044 mirror::DexCache* dex_cache = dex_caches_[i]; 2045 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2046 } 2047 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2048 return NULL; 2049} 2050 2051void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 2052 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2053 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2054 dex_caches_[i]->Fixup(resolution_method); 2055 } 2056} 2057 2058mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2059 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2060 if (UNLIKELY(klass == NULL)) { 2061 return NULL; 2062 } 2063 return InitializePrimitiveClass(klass, type); 2064} 2065 2066mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2067 Primitive::Type type) { 2068 CHECK(primitive_class != NULL); 2069 // Must hold lock on object when initializing. 2070 Thread* self = Thread::Current(); 2071 SirtRef<mirror::Class> sirt_class(self, primitive_class); 2072 ObjectLock<mirror::Class> lock(self, &sirt_class); 2073 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2074 primitive_class->SetPrimitiveType(type); 2075 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2076 const char* descriptor = Primitive::Descriptor(type); 2077 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2078 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2079 return primitive_class; 2080} 2081 2082// Create an array class (i.e. the class object for the array, not the 2083// array itself). "descriptor" looks like "[C" or "[[[[B" or 2084// "[Ljava/lang/String;". 2085// 2086// If "descriptor" refers to an array of primitives, look up the 2087// primitive type's internally-generated class object. 2088// 2089// "class_loader" is the class loader of the class that's referring to 2090// us. It's used to ensure that we're looking for the element type in 2091// the right context. It does NOT become the class loader for the 2092// array class; that always comes from the base element class. 2093// 2094// Returns NULL with an exception raised on failure. 2095mirror::Class* ClassLinker::CreateArrayClass(const char* descriptor, 2096 const SirtRef<mirror::ClassLoader>& class_loader) { 2097 // Identify the underlying component type 2098 CHECK_EQ('[', descriptor[0]); 2099 Thread* self = Thread::Current(); 2100 SirtRef<mirror::Class> component_type(self, FindClass(descriptor + 1, class_loader)); 2101 if (component_type.get() == nullptr) { 2102 DCHECK(self->IsExceptionPending()); 2103 return nullptr; 2104 } 2105 2106 // See if the component type is already loaded. Array classes are 2107 // always associated with the class loader of their underlying 2108 // element type -- an array of Strings goes with the loader for 2109 // java/lang/String -- so we need to look for it there. (The 2110 // caller should have checked for the existence of the class 2111 // before calling here, but they did so with *their* class loader, 2112 // not the component type's loader.) 2113 // 2114 // If we find it, the caller adds "loader" to the class' initiating 2115 // loader list, which should prevent us from going through this again. 2116 // 2117 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2118 // are the same, because our caller (FindClass) just did the 2119 // lookup. (Even if we get this wrong we still have correct behavior, 2120 // because we effectively do this lookup again when we add the new 2121 // class to the hash table --- necessary because of possible races with 2122 // other threads.) 2123 if (class_loader.get() != component_type->GetClassLoader()) { 2124 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2125 if (new_class != NULL) { 2126 return new_class; 2127 } 2128 } 2129 2130 // Fill out the fields in the Class. 2131 // 2132 // It is possible to execute some methods against arrays, because 2133 // all arrays are subclasses of java_lang_Object_, so we need to set 2134 // up a vtable. We can just point at the one in java_lang_Object_. 2135 // 2136 // Array classes are simple enough that we don't need to do a full 2137 // link step. 2138 SirtRef<mirror::Class> new_class(self, NULL); 2139 if (UNLIKELY(!init_done_)) { 2140 // Classes that were hand created, ie not by FindSystemClass 2141 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2142 new_class.reset(GetClassRoot(kClassArrayClass)); 2143 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2144 new_class.reset(GetClassRoot(kObjectArrayClass)); 2145 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2146 new_class.reset(GetClassRoot(kJavaLangStringArrayClass)); 2147 } else if (strcmp(descriptor, 2148 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2149 new_class.reset(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2150 } else if (strcmp(descriptor, 2151 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2152 new_class.reset(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2153 } else if (strcmp(descriptor, "[C") == 0) { 2154 new_class.reset(GetClassRoot(kCharArrayClass)); 2155 } else if (strcmp(descriptor, "[I") == 0) { 2156 new_class.reset(GetClassRoot(kIntArrayClass)); 2157 } 2158 } 2159 if (new_class.get() == nullptr) { 2160 new_class.reset(AllocClass(self, sizeof(mirror::Class))); 2161 if (new_class.get() == nullptr) { 2162 return nullptr; 2163 } 2164 new_class->SetComponentType(component_type.get()); 2165 } 2166 ObjectLock<mirror::Class> lock(self, &new_class); // Must hold lock on object when initializing. 2167 DCHECK(new_class->GetComponentType() != NULL); 2168 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2169 new_class->SetSuperClass(java_lang_Object); 2170 new_class->SetVTable(java_lang_Object->GetVTable()); 2171 new_class->SetPrimitiveType(Primitive::kPrimNot); 2172 new_class->SetClassLoader(component_type->GetClassLoader()); 2173 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2174 // don't need to set new_class->SetObjectSize(..) 2175 // because Object::SizeOf delegates to Array::SizeOf 2176 2177 2178 // All arrays have java/lang/Cloneable and java/io/Serializable as 2179 // interfaces. We need to set that up here, so that stuff like 2180 // "instanceof" works right. 2181 // 2182 // Note: The GC could run during the call to FindSystemClass, 2183 // so we need to make sure the class object is GC-valid while we're in 2184 // there. Do this by clearing the interface list so the GC will just 2185 // think that the entries are null. 2186 2187 2188 // Use the single, global copies of "interfaces" and "iftable" 2189 // (remember not to free them for arrays). 2190 CHECK(array_iftable_ != nullptr); 2191 new_class->SetIfTable(array_iftable_); 2192 2193 // Inherit access flags from the component type. 2194 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2195 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2196 access_flags &= kAccJavaFlagsMask; 2197 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2198 // and remove "interface". 2199 access_flags |= kAccAbstract | kAccFinal; 2200 access_flags &= ~kAccInterface; 2201 2202 new_class->SetAccessFlags(access_flags); 2203 2204 mirror::Class* existing = InsertClass(descriptor, new_class.get(), Hash(descriptor)); 2205 if (existing == nullptr) { 2206 return new_class.get(); 2207 } 2208 // Another thread must have loaded the class after we 2209 // started but before we finished. Abandon what we've 2210 // done. 2211 // 2212 // (Yes, this happens.) 2213 2214 return existing; 2215} 2216 2217mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2218 switch (Primitive::GetType(type)) { 2219 case Primitive::kPrimByte: 2220 return GetClassRoot(kPrimitiveByte); 2221 case Primitive::kPrimChar: 2222 return GetClassRoot(kPrimitiveChar); 2223 case Primitive::kPrimDouble: 2224 return GetClassRoot(kPrimitiveDouble); 2225 case Primitive::kPrimFloat: 2226 return GetClassRoot(kPrimitiveFloat); 2227 case Primitive::kPrimInt: 2228 return GetClassRoot(kPrimitiveInt); 2229 case Primitive::kPrimLong: 2230 return GetClassRoot(kPrimitiveLong); 2231 case Primitive::kPrimShort: 2232 return GetClassRoot(kPrimitiveShort); 2233 case Primitive::kPrimBoolean: 2234 return GetClassRoot(kPrimitiveBoolean); 2235 case Primitive::kPrimVoid: 2236 return GetClassRoot(kPrimitiveVoid); 2237 case Primitive::kPrimNot: 2238 break; 2239 } 2240 std::string printable_type(PrintableChar(type)); 2241 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2242 return NULL; 2243} 2244 2245mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2246 size_t hash) { 2247 if (VLOG_IS_ON(class_linker)) { 2248 mirror::DexCache* dex_cache = klass->GetDexCache(); 2249 std::string source; 2250 if (dex_cache != NULL) { 2251 source += " from "; 2252 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2253 } 2254 LOG(INFO) << "Loaded class " << descriptor << source; 2255 } 2256 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2257 mirror::Class* existing = 2258 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2259 if (existing != NULL) { 2260 return existing; 2261 } 2262 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2263 // Check a class loaded with the system class loader matches one in the image if the class 2264 // is in the image. 2265 existing = LookupClassFromImage(descriptor); 2266 if (existing != NULL) { 2267 CHECK(klass == existing); 2268 } 2269 } 2270 Runtime::Current()->GetHeap()->VerifyObject(klass); 2271 class_table_.insert(std::make_pair(hash, klass)); 2272 class_table_dirty_ = true; 2273 return NULL; 2274} 2275 2276bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2277 size_t hash = Hash(descriptor); 2278 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2279 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2280 ++it) { 2281 mirror::Class* klass = it->second; 2282 ClassHelper kh(klass); 2283 if ((klass->GetClassLoader() == class_loader) && 2284 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2285 class_table_.erase(it); 2286 return true; 2287 } 2288 } 2289 return false; 2290} 2291 2292mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2293 const mirror::ClassLoader* class_loader) { 2294 size_t hash = Hash(descriptor); 2295 { 2296 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2297 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2298 if (result != NULL) { 2299 return result; 2300 } 2301 } 2302 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2303 return NULL; 2304 } else { 2305 // Lookup failed but need to search dex_caches_. 2306 mirror::Class* result = LookupClassFromImage(descriptor); 2307 if (result != NULL) { 2308 InsertClass(descriptor, result, hash); 2309 } else { 2310 // Searching the image dex files/caches failed, we don't want to get into this situation 2311 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2312 // classes into the class table. 2313 const int32_t kMaxFailedDexCacheLookups = 1000; 2314 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2315 MoveImageClassesToClassTable(); 2316 } 2317 } 2318 return result; 2319 } 2320} 2321 2322mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2323 const mirror::ClassLoader* class_loader, 2324 size_t hash) { 2325 auto end = class_table_.end(); 2326 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2327 mirror::Class* klass = it->second; 2328 ClassHelper kh(klass); 2329 if ((klass->GetClassLoader() == class_loader) && 2330 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2331 if (kIsDebugBuild) { 2332 // Check for duplicates in the table. 2333 for (++it; it != end && it->first == hash; ++it) { 2334 mirror::Class* klass2 = it->second; 2335 ClassHelper kh(klass2); 2336 CHECK(!((klass2->GetClassLoader() == class_loader) && 2337 (strcmp(descriptor, kh.GetDescriptor()) == 0))) 2338 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2339 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2340 } 2341 } 2342 return klass; 2343 } 2344 } 2345 return NULL; 2346} 2347 2348static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2349 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2350 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2351 CHECK(image != NULL); 2352 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2353 return root->AsObjectArray<mirror::DexCache>(); 2354} 2355 2356void ClassLinker::MoveImageClassesToClassTable() { 2357 Thread* self = Thread::Current(); 2358 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2359 if (!dex_cache_image_class_lookup_required_) { 2360 return; // All dex cache classes are already in the class table. 2361 } 2362 const char* old_no_suspend_cause = 2363 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2364 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2365 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2366 mirror::DexCache* dex_cache = dex_caches->Get(i); 2367 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2368 for (int32_t j = 0; j < types->GetLength(); j++) { 2369 mirror::Class* klass = types->Get(j); 2370 if (klass != NULL) { 2371 ClassHelper kh(klass); 2372 DCHECK(klass->GetClassLoader() == NULL); 2373 const char* descriptor = kh.GetDescriptor(); 2374 size_t hash = Hash(descriptor); 2375 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 2376 if (existing != NULL) { 2377 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2378 << PrettyClassAndClassLoader(klass); 2379 } else { 2380 class_table_.insert(std::make_pair(hash, klass)); 2381 } 2382 } 2383 } 2384 } 2385 class_table_dirty_ = true; 2386 dex_cache_image_class_lookup_required_ = false; 2387 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2388} 2389 2390mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2391 Thread* self = Thread::Current(); 2392 const char* old_no_suspend_cause = 2393 self->StartAssertNoThreadSuspension("Image class lookup"); 2394 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2395 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2396 mirror::DexCache* dex_cache = dex_caches->Get(i); 2397 const DexFile* dex_file = dex_cache->GetDexFile(); 2398 // Try binary searching the string/type index. 2399 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2400 if (string_id != NULL) { 2401 const DexFile::TypeId* type_id = 2402 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2403 if (type_id != NULL) { 2404 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2405 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2406 if (klass != NULL) { 2407 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2408 return klass; 2409 } 2410 } 2411 } 2412 } 2413 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2414 return NULL; 2415} 2416 2417void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2418 result.clear(); 2419 if (dex_cache_image_class_lookup_required_) { 2420 MoveImageClassesToClassTable(); 2421 } 2422 size_t hash = Hash(descriptor); 2423 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2424 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2425 it != end && it->first == hash; ++it) { 2426 mirror::Class* klass = it->second; 2427 ClassHelper kh(klass); 2428 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2429 result.push_back(klass); 2430 } 2431 } 2432} 2433 2434void ClassLinker::VerifyClass(const SirtRef<mirror::Class>& klass) { 2435 // TODO: assert that the monitor on the Class is held 2436 Thread* self = Thread::Current(); 2437 ObjectLock<mirror::Class> lock(self, &klass); 2438 2439 // Don't attempt to re-verify if already sufficiently verified. 2440 if (klass->IsVerified() || 2441 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2442 return; 2443 } 2444 2445 // The class might already be erroneous, for example at compile time if we attempted to verify 2446 // this class as a parent to another. 2447 if (klass->IsErroneous()) { 2448 ThrowEarlierClassFailure(klass.get()); 2449 return; 2450 } 2451 2452 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2453 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2454 } else { 2455 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2456 << PrettyClass(klass.get()); 2457 CHECK(!Runtime::Current()->IsCompiler()); 2458 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2459 } 2460 2461 // Verify super class. 2462 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 2463 if (super.get() != NULL) { 2464 // Acquire lock to prevent races on verifying the super class. 2465 ObjectLock<mirror::Class> lock(self, &super); 2466 2467 if (!super->IsVerified() && !super->IsErroneous()) { 2468 VerifyClass(super); 2469 } 2470 if (!super->IsCompileTimeVerified()) { 2471 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2472 PrettyDescriptor(klass.get()).c_str(), 2473 PrettyDescriptor(super.get()).c_str())); 2474 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2475 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 2476 if (cause.get() != nullptr) { 2477 self->ClearException(); 2478 } 2479 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2480 if (cause.get() != nullptr) { 2481 self->GetException(nullptr)->SetCause(cause.get()); 2482 } 2483 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2484 if (Runtime::Current()->IsCompiler()) { 2485 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2486 } 2487 klass->SetStatus(mirror::Class::kStatusError, self); 2488 return; 2489 } 2490 } 2491 2492 // Try to use verification information from the oat file, otherwise do runtime verification. 2493 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2494 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2495 bool preverified = VerifyClassUsingOatFile(dex_file, klass.get(), oat_file_class_status); 2496 if (oat_file_class_status == mirror::Class::kStatusError) { 2497 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2498 << PrettyDescriptor(klass.get()) << " in " 2499 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2500 ThrowVerifyError(klass.get(), "Rejecting class %s because it failed compile-time verification", 2501 PrettyDescriptor(klass.get()).c_str()); 2502 klass->SetStatus(mirror::Class::kStatusError, self); 2503 return; 2504 } 2505 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2506 std::string error_msg; 2507 if (!preverified) { 2508 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.get(), 2509 Runtime::Current()->IsCompiler(), 2510 &error_msg); 2511 } 2512 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2513 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2514 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.get()) 2515 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2516 << " because: " << error_msg; 2517 } 2518 self->AssertNoPendingException(); 2519 // Make sure all classes referenced by catch blocks are resolved. 2520 ResolveClassExceptionHandlerTypes(dex_file, klass); 2521 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2522 // Even though there were no verifier failures we need to respect whether the super-class 2523 // was verified or requiring runtime reverification. 2524 if (super.get() == NULL || super->IsVerified()) { 2525 klass->SetStatus(mirror::Class::kStatusVerified, self); 2526 } else { 2527 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2528 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2529 // Pretend a soft failure occured so that we don't consider the class verified below. 2530 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2531 } 2532 } else { 2533 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2534 // Soft failures at compile time should be retried at runtime. Soft 2535 // failures at runtime will be handled by slow paths in the generated 2536 // code. Set status accordingly. 2537 if (Runtime::Current()->IsCompiler()) { 2538 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2539 } else { 2540 klass->SetStatus(mirror::Class::kStatusVerified, self); 2541 } 2542 } 2543 } else { 2544 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.get()) 2545 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2546 << " because: " << error_msg; 2547 self->AssertNoPendingException(); 2548 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2549 klass->SetStatus(mirror::Class::kStatusError, self); 2550 } 2551 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2552 // Class is verified so we don't need to do any access check on its methods. 2553 // Let the interpreter know it by setting the kAccPreverified flag onto each 2554 // method. 2555 // Note: we're going here during compilation and at runtime. When we set the 2556 // kAccPreverified flag when compiling image classes, the flag is recorded 2557 // in the image and is set when loading the image. 2558 klass->SetPreverifiedFlagOnAllMethods(); 2559 } 2560} 2561 2562bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2563 mirror::Class::Status& oat_file_class_status) { 2564 // If we're compiling, we can only verify the class using the oat file if 2565 // we are not compiling the image or if the class we're verifying is not part of 2566 // the app. In other words, we will only check for preverification of bootclasspath 2567 // classes. 2568 if (Runtime::Current()->IsCompiler()) { 2569 // Are we compiling the bootclasspath? 2570 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2571 return false; 2572 } 2573 // We are compiling an app (not the image). 2574 2575 // Is this an app class? (I.e. not a bootclasspath class) 2576 if (klass->GetClassLoader() != NULL) { 2577 return false; 2578 } 2579 } 2580 2581 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2582 // Make this work with gtests, which do not set up the image properly. 2583 // TODO: we should clean up gtests to set up the image path properly. 2584 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2585 return false; 2586 } 2587 2588 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2589 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2590 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2591 &dex_location_checksum); 2592 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2593 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2594 UniquePtr<const OatFile::OatClass> oat_class(oat_dex_file->GetOatClass(class_def_index)); 2595 CHECK(oat_class.get() != NULL) 2596 << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2597 << ClassHelper(klass).GetDescriptor(); 2598 oat_file_class_status = oat_class->GetStatus(); 2599 if (oat_file_class_status == mirror::Class::kStatusVerified || 2600 oat_file_class_status == mirror::Class::kStatusInitialized) { 2601 return true; 2602 } 2603 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2604 // Compile time verification failed with a soft error. Compile time verification can fail 2605 // because we have incomplete type information. Consider the following: 2606 // class ... { 2607 // Foo x; 2608 // .... () { 2609 // if (...) { 2610 // v1 gets assigned a type of resolved class Foo 2611 // } else { 2612 // v1 gets assigned a type of unresolved class Bar 2613 // } 2614 // iput x = v1 2615 // } } 2616 // when we merge v1 following the if-the-else it results in Conflict 2617 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2618 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2619 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2620 // at compile time). 2621 return false; 2622 } 2623 if (oat_file_class_status == mirror::Class::kStatusError) { 2624 // Compile time verification failed with a hard error. This is caused by invalid instructions 2625 // in the class. These errors are unrecoverable. 2626 return false; 2627 } 2628 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2629 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2630 // not loading the class. 2631 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2632 // isn't a problem and this case shouldn't occur 2633 return false; 2634 } 2635 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2636 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2637 << ClassHelper(klass).GetDescriptor(); 2638 2639 return false; 2640} 2641 2642void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2643 const SirtRef<mirror::Class>& klass) { 2644 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2645 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2646 } 2647 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2648 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2649 } 2650} 2651 2652void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2653 mirror::ArtMethod* method) { 2654 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2655 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2656 if (code_item == NULL) { 2657 return; // native or abstract method 2658 } 2659 if (code_item->tries_size_ == 0) { 2660 return; // nothing to process 2661 } 2662 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2663 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2664 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2665 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2666 CatchHandlerIterator iterator(handlers_ptr); 2667 for (; iterator.HasNext(); iterator.Next()) { 2668 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2669 // unresolved exception types will be ignored by exception delivery 2670 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2671 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2672 if (exception_type == NULL) { 2673 DCHECK(Thread::Current()->IsExceptionPending()); 2674 Thread::Current()->ClearException(); 2675 } 2676 } 2677 } 2678 handlers_ptr = iterator.EndDataPointer(); 2679 } 2680} 2681 2682static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2683static void CheckProxyMethod(mirror::ArtMethod* method, 2684 SirtRef<mirror::ArtMethod>& prototype); 2685 2686mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccess& soa, jstring name, 2687 jobjectArray interfaces, jobject loader, 2688 jobjectArray methods, jobjectArray throws) { 2689 Thread* self = soa.Self(); 2690 SirtRef<mirror::Class> klass(self, AllocClass(self, GetClassRoot(kJavaLangClass), 2691 sizeof(mirror::SynthesizedProxyClass))); 2692 if (klass.get() == NULL) { 2693 CHECK(self->IsExceptionPending()); // OOME. 2694 return NULL; 2695 } 2696 DCHECK(klass->GetClass() != NULL); 2697 klass->SetObjectSize(sizeof(mirror::Proxy)); 2698 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2699 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2700 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2701 klass->SetName(soa.Decode<mirror::String*>(name)); 2702 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2703 klass->SetDexCache(proxy_class->GetDexCache()); 2704 klass->SetStatus(mirror::Class::kStatusIdx, self); 2705 2706 // Instance fields are inherited, but we add a couple of static fields... 2707 { 2708 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2709 if (UNLIKELY(sfields == NULL)) { 2710 CHECK(self->IsExceptionPending()); // OOME. 2711 return NULL; 2712 } 2713 klass->SetSFields(sfields); 2714 } 2715 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2716 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2717 SirtRef<mirror::ArtField> interfaces_sfield(self, AllocArtField(self)); 2718 if (UNLIKELY(interfaces_sfield.get() == NULL)) { 2719 CHECK(self->IsExceptionPending()); // OOME. 2720 return NULL; 2721 } 2722 klass->SetStaticField(0, interfaces_sfield.get()); 2723 interfaces_sfield->SetDexFieldIndex(0); 2724 interfaces_sfield->SetDeclaringClass(klass.get()); 2725 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2726 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2727 SirtRef<mirror::ArtField> throws_sfield(self, AllocArtField(self)); 2728 if (UNLIKELY(throws_sfield.get() == NULL)) { 2729 CHECK(self->IsExceptionPending()); // OOME. 2730 return NULL; 2731 } 2732 klass->SetStaticField(1, throws_sfield.get()); 2733 throws_sfield->SetDexFieldIndex(1); 2734 throws_sfield->SetDeclaringClass(klass.get()); 2735 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2736 2737 // Proxies have 1 direct method, the constructor 2738 { 2739 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 2740 if (UNLIKELY(directs == NULL)) { 2741 CHECK(self->IsExceptionPending()); // OOME. 2742 return NULL; 2743 } 2744 klass->SetDirectMethods(directs); 2745 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2746 if (UNLIKELY(constructor == NULL)) { 2747 CHECK(self->IsExceptionPending()); // OOME. 2748 return NULL; 2749 } 2750 klass->SetDirectMethod(0, constructor); 2751 } 2752 2753 // Create virtual method using specified prototypes. 2754 size_t num_virtual_methods = 2755 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 2756 { 2757 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, num_virtual_methods); 2758 if (UNLIKELY(virtuals == NULL)) { 2759 CHECK(self->IsExceptionPending()); // OOME. 2760 return NULL; 2761 } 2762 klass->SetVirtualMethods(virtuals); 2763 } 2764 for (size_t i = 0; i < num_virtual_methods; ++i) { 2765 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2766 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2767 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2768 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2769 if (UNLIKELY(clone == NULL)) { 2770 CHECK(self->IsExceptionPending()); // OOME. 2771 return NULL; 2772 } 2773 klass->SetVirtualMethod(i, clone); 2774 } 2775 2776 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2777 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Class is now effectively in the loaded state 2778 self->AssertNoPendingException(); 2779 2780 { 2781 ObjectLock<mirror::Class> lock(self, &klass); // Must hold lock on object when resolved. 2782 // Link the fields and virtual methods, creating vtable and iftables 2783 SirtRef<mirror::ObjectArray<mirror::Class> > sirt_interfaces( 2784 self, soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2785 if (!LinkClass(self, klass, sirt_interfaces)) { 2786 klass->SetStatus(mirror::Class::kStatusError, self); 2787 return nullptr; 2788 } 2789 2790 interfaces_sfield->SetObject(klass.get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2791 throws_sfield->SetObject(klass.get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2792 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2793 } 2794 2795 // sanity checks 2796 if (kIsDebugBuild) { 2797 CHECK(klass->GetIFields() == NULL); 2798 CheckProxyConstructor(klass->GetDirectMethod(0)); 2799 for (size_t i = 0; i < num_virtual_methods; ++i) { 2800 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2801 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2802 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2803 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2804 } 2805 2806 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 2807 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2808 decoded_name->ToModifiedUtf8().c_str())); 2809 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2810 2811 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2812 decoded_name->ToModifiedUtf8().c_str())); 2813 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2814 2815 mirror::SynthesizedProxyClass* synth_proxy_class = 2816 down_cast<mirror::SynthesizedProxyClass*>(klass.get()); 2817 CHECK_EQ(synth_proxy_class->GetInterfaces(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2818 CHECK_EQ(synth_proxy_class->GetThrows(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2819 } 2820 std::string descriptor(GetDescriptorForProxy(klass.get())); 2821 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.get(), Hash(descriptor.c_str())); 2822 CHECK(existing == nullptr); 2823 return klass.get(); 2824} 2825 2826std::string ClassLinker::GetDescriptorForProxy(const mirror::Class* proxy_class) { 2827 DCHECK(proxy_class->IsProxyClass()); 2828 mirror::String* name = proxy_class->GetName(); 2829 DCHECK(name != NULL); 2830 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2831} 2832 2833mirror::ArtMethod* ClassLinker::FindMethodForProxy(const mirror::Class* proxy_class, 2834 const mirror::ArtMethod* proxy_method) { 2835 DCHECK(proxy_class->IsProxyClass()); 2836 DCHECK(proxy_method->IsProxyMethod()); 2837 // Locate the dex cache of the original interface/Object 2838 mirror::DexCache* dex_cache = NULL; 2839 { 2840 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2841 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2842 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2843 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2844 dex_cache = dex_caches_[i]; 2845 break; 2846 } 2847 } 2848 } 2849 CHECK(dex_cache != NULL); 2850 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2851 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2852 CHECK(resolved_method != NULL); 2853 return resolved_method; 2854} 2855 2856 2857mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2858 const SirtRef<mirror::Class>& klass, 2859 mirror::Class* proxy_class) { 2860 // Create constructor for Proxy that must initialize h 2861 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2862 proxy_class->GetDirectMethods(); 2863 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2864 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2865 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2866 // code_ too) 2867 mirror::ArtMethod* constructor = 2868 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2869 if (constructor == NULL) { 2870 CHECK(self->IsExceptionPending()); // OOME. 2871 return NULL; 2872 } 2873 // Make this constructor public and fix the class to be our Proxy version 2874 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2875 constructor->SetDeclaringClass(klass.get()); 2876 return constructor; 2877} 2878 2879static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2880 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2881 CHECK(constructor->IsConstructor()); 2882 MethodHelper mh(constructor); 2883 CHECK_STREQ(mh.GetName(), "<init>"); 2884 CHECK_STREQ(mh.GetSignature().ToString().c_str(), "(Ljava/lang/reflect/InvocationHandler;)V"); 2885 DCHECK(constructor->IsPublic()); 2886} 2887 2888mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 2889 const SirtRef<mirror::Class>& klass, 2890 const SirtRef<mirror::ArtMethod>& prototype) { 2891 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2892 // prototype method 2893 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2894 prototype.get()); 2895 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2896 // as necessary 2897 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 2898 if (UNLIKELY(method == NULL)) { 2899 CHECK(self->IsExceptionPending()); // OOME. 2900 return NULL; 2901 } 2902 2903 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 2904 // the intersection of throw exceptions as defined in Proxy 2905 method->SetDeclaringClass(klass.get()); 2906 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 2907 2908 // At runtime the method looks like a reference and argument saving method, clone the code 2909 // related parameters from this method. 2910 mirror::ArtMethod* refs_and_args = 2911 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 2912 method->SetCoreSpillMask(refs_and_args->GetCoreSpillMask()); 2913 method->SetFpSpillMask(refs_and_args->GetFpSpillMask()); 2914 method->SetFrameSizeInBytes(refs_and_args->GetFrameSizeInBytes()); 2915 method->SetEntryPointFromCompiledCode(GetProxyInvokeHandler()); 2916 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2917 2918 return method; 2919} 2920 2921static void CheckProxyMethod(mirror::ArtMethod* method, 2922 SirtRef<mirror::ArtMethod>& prototype) 2923 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2924 // Basic sanity 2925 CHECK(!prototype->IsFinal()); 2926 CHECK(method->IsFinal()); 2927 CHECK(!method->IsAbstract()); 2928 2929 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 2930 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 2931 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 2932 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 2933 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 2934 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 2935 2936 MethodHelper mh(method); 2937 MethodHelper mh2(prototype.get()); 2938 CHECK_STREQ(mh.GetName(), mh2.GetName()); 2939 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 2940 // More complex sanity - via dex cache 2941 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 2942} 2943 2944static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 2945 bool can_init_parents) 2946 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2947 if (can_init_statics && can_init_parents) { 2948 return true; 2949 } 2950 if (!can_init_statics) { 2951 // Check if there's a class initializer. 2952 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 2953 if (clinit != NULL) { 2954 return false; 2955 } 2956 // Check if there are encoded static values needing initialization. 2957 if (klass->NumStaticFields() != 0) { 2958 ClassHelper kh(klass); 2959 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 2960 DCHECK(dex_class_def != NULL); 2961 if (dex_class_def->static_values_off_ != 0) { 2962 return false; 2963 } 2964 } 2965 } 2966 if (!klass->IsInterface() && klass->HasSuperClass()) { 2967 mirror::Class* super_class = klass->GetSuperClass(); 2968 if (!can_init_parents && !super_class->IsInitialized()) { 2969 return false; 2970 } else { 2971 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 2972 return false; 2973 } 2974 } 2975 } 2976 return true; 2977} 2978 2979bool ClassLinker::IsInitialized() const { 2980 return init_done_; 2981} 2982 2983bool ClassLinker::InitializeClass(const SirtRef<mirror::Class>& klass, bool can_init_statics, 2984 bool can_init_parents) { 2985 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 2986 2987 // Are we already initialized and therefore done? 2988 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 2989 // an initialized class will never change its state. 2990 if (klass->IsInitialized()) { 2991 return true; 2992 } 2993 2994 // Fast fail if initialization requires a full runtime. Not part of the JLS. 2995 if (!CanWeInitializeClass(klass.get(), can_init_statics, can_init_parents)) { 2996 return false; 2997 } 2998 2999 Thread* self = Thread::Current(); 3000 uint64_t t0; 3001 { 3002 ObjectLock<mirror::Class> lock(self, &klass); 3003 3004 // Re-check under the lock in case another thread initialized ahead of us. 3005 if (klass->IsInitialized()) { 3006 return true; 3007 } 3008 3009 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3010 if (klass->IsErroneous()) { 3011 ThrowEarlierClassFailure(klass.get()); 3012 return false; 3013 } 3014 3015 CHECK(klass->IsResolved()) << PrettyClass(klass.get()) << ": state=" << klass->GetStatus(); 3016 3017 if (!klass->IsVerified()) { 3018 VerifyClass(klass); 3019 if (!klass->IsVerified()) { 3020 // We failed to verify, expect either the klass to be erroneous or verification failed at 3021 // compile time. 3022 if (klass->IsErroneous()) { 3023 CHECK(self->IsExceptionPending()); 3024 } else { 3025 CHECK(Runtime::Current()->IsCompiler()); 3026 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3027 } 3028 return false; 3029 } 3030 } 3031 3032 // If the class is kStatusInitializing, either this thread is 3033 // initializing higher up the stack or another thread has beat us 3034 // to initializing and we need to wait. Either way, this 3035 // invocation of InitializeClass will not be responsible for 3036 // running <clinit> and will return. 3037 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3038 // We caught somebody else in the act; was it us? 3039 if (klass->GetClinitThreadId() == self->GetTid()) { 3040 // Yes. That's fine. Return so we can continue initializing. 3041 return true; 3042 } 3043 // No. That's fine. Wait for another thread to finish initializing. 3044 return WaitForInitializeClass(klass, self, lock); 3045 } 3046 3047 if (!ValidateSuperClassDescriptors(klass)) { 3048 klass->SetStatus(mirror::Class::kStatusError, self); 3049 return false; 3050 } 3051 3052 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.get()); 3053 3054 // From here out other threads may observe that we're initializing and so changes of state 3055 // require the a notification. 3056 klass->SetClinitThreadId(self->GetTid()); 3057 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3058 3059 t0 = NanoTime(); 3060 } 3061 3062 // Initialize super classes, must be done while initializing for the JLS. 3063 if (!klass->IsInterface() && klass->HasSuperClass()) { 3064 mirror::Class* super_class = klass->GetSuperClass(); 3065 if (!super_class->IsInitialized()) { 3066 CHECK(!super_class->IsInterface()); 3067 CHECK(can_init_parents); 3068 SirtRef<mirror::Class> sirt_super(self, super_class); 3069 bool super_initialized = InitializeClass(sirt_super, can_init_statics, true); 3070 if (!super_initialized) { 3071 // The super class was verified ahead of entering initializing, we should only be here if 3072 // the super class became erroneous due to initialization. 3073 CHECK(sirt_super->IsErroneous() && self->IsExceptionPending()) 3074 << "Super class initialization failed for " << PrettyDescriptor(sirt_super.get()) 3075 << " that has unexpected status " << sirt_super->GetStatus() 3076 << "\nPending exception:\n" 3077 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3078 ObjectLock<mirror::Class> lock(self, &klass); 3079 // Initialization failed because the super-class is erroneous. 3080 klass->SetStatus(mirror::Class::kStatusError, self); 3081 return false; 3082 } 3083 } 3084 } 3085 3086 if (klass->NumStaticFields() > 0) { 3087 ClassHelper kh(klass.get()); 3088 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3089 CHECK(dex_class_def != NULL); 3090 const DexFile& dex_file = kh.GetDexFile(); 3091 SirtRef<mirror::ClassLoader> class_loader(self, klass->GetClassLoader()); 3092 SirtRef<mirror::DexCache> dex_cache(self, kh.GetDexCache()); 3093 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3094 this, *dex_class_def); 3095 if (it.HasNext()) { 3096 CHECK(can_init_statics); 3097 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 3098 SafeMap<uint32_t, mirror::ArtField*> field_map; 3099 ConstructFieldMap(dex_file, *dex_class_def, klass.get(), field_map); 3100 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3101 it.ReadValueToField(field_map.Get(i)); 3102 } 3103 } 3104 } 3105 3106 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3107 if (clinit != NULL) { 3108 CHECK(can_init_statics); 3109 if (LIKELY(Runtime::Current()->IsStarted())) { 3110 JValue result; 3111 clinit->Invoke(self, NULL, 0, &result, 'V'); 3112 } else { 3113 art::interpreter::EnterInterpreterFromInvoke(self, clinit, NULL, NULL, NULL); 3114 } 3115 } 3116 3117 // Opportunistically set static method trampolines to their destination. 3118 FixupStaticTrampolines(klass.get()); 3119 3120 uint64_t t1 = NanoTime(); 3121 3122 bool success = true; 3123 { 3124 ObjectLock<mirror::Class> lock(self, &klass); 3125 3126 if (self->IsExceptionPending()) { 3127 WrapExceptionInInitializer(); 3128 klass->SetStatus(mirror::Class::kStatusError, self); 3129 success = false; 3130 } else { 3131 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3132 RuntimeStats* thread_stats = self->GetStats(); 3133 ++global_stats->class_init_count; 3134 ++thread_stats->class_init_count; 3135 global_stats->class_init_time_ns += (t1 - t0); 3136 thread_stats->class_init_time_ns += (t1 - t0); 3137 // Set the class as initialized except if failed to initialize static fields. 3138 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3139 if (VLOG_IS_ON(class_linker)) { 3140 ClassHelper kh(klass.get()); 3141 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 3142 } 3143 } 3144 } 3145 return success; 3146} 3147 3148bool ClassLinker::WaitForInitializeClass(const SirtRef<mirror::Class>& klass, Thread* self, 3149 ObjectLock<mirror::Class>& lock) 3150 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3151 while (true) { 3152 self->AssertNoPendingException(); 3153 CHECK(!klass->IsInitialized()); 3154 lock.WaitIgnoringInterrupts(); 3155 3156 // When we wake up, repeat the test for init-in-progress. If 3157 // there's an exception pending (only possible if 3158 // "interruptShouldThrow" was set), bail out. 3159 if (self->IsExceptionPending()) { 3160 WrapExceptionInInitializer(); 3161 klass->SetStatus(mirror::Class::kStatusError, self); 3162 return false; 3163 } 3164 // Spurious wakeup? Go back to waiting. 3165 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3166 continue; 3167 } 3168 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3169 // Compile time initialization failed. 3170 return false; 3171 } 3172 if (klass->IsErroneous()) { 3173 // The caller wants an exception, but it was thrown in a 3174 // different thread. Synthesize one here. 3175 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3176 PrettyDescriptor(klass.get()).c_str()); 3177 return false; 3178 } 3179 if (klass->IsInitialized()) { 3180 return true; 3181 } 3182 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.get()) << " is " 3183 << klass->GetStatus(); 3184 } 3185 LOG(FATAL) << "Not Reached" << PrettyClass(klass.get()); 3186} 3187 3188bool ClassLinker::ValidateSuperClassDescriptors(const SirtRef<mirror::Class>& klass) { 3189 if (klass->IsInterface()) { 3190 return true; 3191 } 3192 Thread* self = Thread::Current(); 3193 // begin with the methods local to the superclass 3194 if (klass->HasSuperClass() && 3195 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3196 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 3197 for (int i = super->GetVTable()->GetLength() - 1; i >= 0; --i) { 3198 const mirror::ArtMethod* method = klass->GetVTable()->Get(i); 3199 if (method != super->GetVTable()->Get(i) && 3200 !IsSameMethodSignatureInDifferentClassContexts(method, super.get(), klass.get())) { 3201 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in superclass %s", 3202 PrettyDescriptor(klass.get()).c_str(), PrettyMethod(method).c_str(), 3203 PrettyDescriptor(super.get()).c_str()); 3204 return false; 3205 } 3206 } 3207 } 3208 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3209 SirtRef<mirror::Class> interface(self, klass->GetIfTable()->GetInterface(i)); 3210 if (klass->GetClassLoader() != interface->GetClassLoader()) { 3211 for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { 3212 const mirror::ArtMethod* method = klass->GetIfTable()->GetMethodArray(i)->Get(j); 3213 if (!IsSameMethodSignatureInDifferentClassContexts(method, interface.get(), 3214 method->GetDeclaringClass())) { 3215 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in interface %s", 3216 PrettyDescriptor(method->GetDeclaringClass()).c_str(), 3217 PrettyMethod(method).c_str(), 3218 PrettyDescriptor(interface.get()).c_str()); 3219 return false; 3220 } 3221 } 3222 } 3223 } 3224 return true; 3225} 3226 3227// Returns true if classes referenced by the signature of the method are the 3228// same classes in klass1 as they are in klass2. 3229bool ClassLinker::IsSameMethodSignatureInDifferentClassContexts(const mirror::ArtMethod* method, 3230 const mirror::Class* klass1, 3231 const mirror::Class* klass2) { 3232 if (klass1 == klass2) { 3233 return true; 3234 } 3235 Thread* self = Thread::Current(); 3236 CHECK(klass1 != nullptr); 3237 CHECK(klass2 != nullptr); 3238 SirtRef<mirror::ClassLoader> loader1(self, klass1->GetClassLoader()); 3239 SirtRef<mirror::ClassLoader> loader2(self, klass2->GetClassLoader()); 3240 const DexFile& dex_file = *method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 3241 const DexFile::ProtoId& proto_id = 3242 dex_file.GetMethodPrototype(dex_file.GetMethodId(method->GetDexMethodIndex())); 3243 for (DexFileParameterIterator it(dex_file, proto_id); it.HasNext(); it.Next()) { 3244 const char* descriptor = it.GetDescriptor(); 3245 if (descriptor == nullptr) { 3246 break; 3247 } 3248 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3249 // Found a non-primitive type. 3250 if (!IsSameDescriptorInDifferentClassContexts(descriptor, loader1, loader2)) { 3251 return false; 3252 } 3253 } 3254 } 3255 // Check the return type 3256 const char* descriptor = dex_file.GetReturnTypeDescriptor(proto_id); 3257 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3258 if (!IsSameDescriptorInDifferentClassContexts(descriptor, loader1, loader2)) { 3259 return false; 3260 } 3261 } 3262 return true; 3263} 3264 3265// Returns true if the descriptor resolves to the same class in the context of loader1 and loader2. 3266bool ClassLinker::IsSameDescriptorInDifferentClassContexts(const char* descriptor, 3267 SirtRef<mirror::ClassLoader>& loader1, 3268 SirtRef<mirror::ClassLoader>& loader2) { 3269 CHECK(descriptor != nullptr); 3270 Thread* self = Thread::Current(); 3271 SirtRef<mirror::Class> found1(self, FindClass(descriptor, loader1)); 3272 if (found1.get() == nullptr) { 3273 self->ClearException(); 3274 } 3275 mirror::Class* found2 = FindClass(descriptor, loader2); 3276 if (found2 == nullptr) { 3277 self->ClearException(); 3278 } 3279 return found1.get() == found2; 3280} 3281 3282bool ClassLinker::EnsureInitialized(const SirtRef<mirror::Class>& c, bool can_init_fields, 3283 bool can_init_parents) { 3284 DCHECK(c.get() != NULL); 3285 if (c->IsInitialized()) { 3286 return true; 3287 } 3288 3289 bool success = InitializeClass(c, can_init_fields, can_init_parents); 3290 if (!success) { 3291 if (can_init_fields && can_init_parents) { 3292 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.get()); 3293 } 3294 } 3295 return success; 3296} 3297 3298void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3299 mirror::Class* c, 3300 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3301 const byte* class_data = dex_file.GetClassData(dex_class_def); 3302 ClassDataItemIterator it(dex_file, class_data); 3303 Thread* self = Thread::Current(); 3304 SirtRef<mirror::DexCache> dex_cache(self, c->GetDexCache()); 3305 SirtRef<mirror::ClassLoader> class_loader(self, c->GetClassLoader()); 3306 CHECK(!kMovingFields); 3307 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3308 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3309 } 3310} 3311 3312bool ClassLinker::LinkClass(Thread* self, const SirtRef<mirror::Class>& klass, 3313 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3314 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3315 if (!LinkSuperClass(klass)) { 3316 return false; 3317 } 3318 if (!LinkMethods(klass, interfaces)) { 3319 return false; 3320 } 3321 if (!LinkInstanceFields(klass)) { 3322 return false; 3323 } 3324 if (!LinkStaticFields(klass)) { 3325 return false; 3326 } 3327 CreateReferenceInstanceOffsets(klass); 3328 CreateReferenceStaticOffsets(klass); 3329 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3330 klass->SetStatus(mirror::Class::kStatusResolved, self); 3331 return true; 3332} 3333 3334bool ClassLinker::LoadSuperAndInterfaces(const SirtRef<mirror::Class>& klass, 3335 const DexFile& dex_file) { 3336 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3337 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3338 uint16_t super_class_idx = class_def.superclass_idx_; 3339 if (super_class_idx != DexFile::kDexNoIndex16) { 3340 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.get()); 3341 if (super_class == NULL) { 3342 DCHECK(Thread::Current()->IsExceptionPending()); 3343 return false; 3344 } 3345 // Verify 3346 if (!klass->CanAccess(super_class)) { 3347 ThrowIllegalAccessError(klass.get(), "Class %s extended by class %s is inaccessible", 3348 PrettyDescriptor(super_class).c_str(), 3349 PrettyDescriptor(klass.get()).c_str()); 3350 return false; 3351 } 3352 klass->SetSuperClass(super_class); 3353 } 3354 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3355 if (interfaces != NULL) { 3356 for (size_t i = 0; i < interfaces->Size(); i++) { 3357 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3358 mirror::Class* interface = ResolveType(dex_file, idx, klass.get()); 3359 if (interface == NULL) { 3360 DCHECK(Thread::Current()->IsExceptionPending()); 3361 return false; 3362 } 3363 // Verify 3364 if (!klass->CanAccess(interface)) { 3365 // TODO: the RI seemed to ignore this in my testing. 3366 ThrowIllegalAccessError(klass.get(), "Interface %s implemented by class %s is inaccessible", 3367 PrettyDescriptor(interface).c_str(), 3368 PrettyDescriptor(klass.get()).c_str()); 3369 return false; 3370 } 3371 } 3372 } 3373 // Mark the class as loaded. 3374 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3375 return true; 3376} 3377 3378bool ClassLinker::LinkSuperClass(const SirtRef<mirror::Class>& klass) { 3379 CHECK(!klass->IsPrimitive()); 3380 mirror::Class* super = klass->GetSuperClass(); 3381 if (klass.get() == GetClassRoot(kJavaLangObject)) { 3382 if (super != NULL) { 3383 ThrowClassFormatError(klass.get(), "java.lang.Object must not have a superclass"); 3384 return false; 3385 } 3386 return true; 3387 } 3388 if (super == NULL) { 3389 ThrowLinkageError(klass.get(), "No superclass defined for class %s", 3390 PrettyDescriptor(klass.get()).c_str()); 3391 return false; 3392 } 3393 // Verify 3394 if (super->IsFinal() || super->IsInterface()) { 3395 ThrowIncompatibleClassChangeError(klass.get(), "Superclass %s of %s is %s", 3396 PrettyDescriptor(super).c_str(), 3397 PrettyDescriptor(klass.get()).c_str(), 3398 super->IsFinal() ? "declared final" : "an interface"); 3399 return false; 3400 } 3401 if (!klass->CanAccess(super)) { 3402 ThrowIllegalAccessError(klass.get(), "Superclass %s is inaccessible to class %s", 3403 PrettyDescriptor(super).c_str(), 3404 PrettyDescriptor(klass.get()).c_str()); 3405 return false; 3406 } 3407 3408 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3409 if (super->IsFinalizable()) { 3410 klass->SetFinalizable(); 3411 } 3412 3413 // Inherit reference flags (if any) from the superclass. 3414 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3415 if (reference_flags != 0) { 3416 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3417 } 3418 // Disallow custom direct subclasses of java.lang.ref.Reference. 3419 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3420 ThrowLinkageError(klass.get(), 3421 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3422 PrettyDescriptor(klass.get()).c_str()); 3423 return false; 3424 } 3425 3426 if (kIsDebugBuild) { 3427 // Ensure super classes are fully resolved prior to resolving fields.. 3428 while (super != NULL) { 3429 CHECK(super->IsResolved()); 3430 super = super->GetSuperClass(); 3431 } 3432 } 3433 return true; 3434} 3435 3436// Populate the class vtable and itable. Compute return type indices. 3437bool ClassLinker::LinkMethods(const SirtRef<mirror::Class>& klass, 3438 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3439 if (klass->IsInterface()) { 3440 // No vtable. 3441 size_t count = klass->NumVirtualMethods(); 3442 if (!IsUint(16, count)) { 3443 ThrowClassFormatError(klass.get(), "Too many methods on interface: %zd", count); 3444 return false; 3445 } 3446 for (size_t i = 0; i < count; ++i) { 3447 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3448 } 3449 // Link interface method tables 3450 return LinkInterfaceMethods(klass, interfaces); 3451 } else { 3452 // Link virtual and interface method tables 3453 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3454 } 3455 return true; 3456} 3457 3458bool ClassLinker::LinkVirtualMethods(const SirtRef<mirror::Class>& klass) { 3459 Thread* self = Thread::Current(); 3460 if (klass->HasSuperClass()) { 3461 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3462 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3463 CHECK_LE(actual_count, max_count); 3464 // TODO: do not assign to the vtable field until it is fully constructed. 3465 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3466 vtable(self, klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count)); 3467 if (UNLIKELY(vtable.get() == NULL)) { 3468 CHECK(self->IsExceptionPending()); // OOME. 3469 return false; 3470 } 3471 // See if any of our virtual methods override the superclass. 3472 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3473 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3474 MethodHelper local_mh(local_method); 3475 size_t j = 0; 3476 for (; j < actual_count; ++j) { 3477 mirror::ArtMethod* super_method = vtable->Get(j); 3478 MethodHelper super_mh(super_method); 3479 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3480 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3481 if (super_method->IsFinal()) { 3482 ThrowLinkageError(klass.get(), "Method %s overrides final method in class %s", 3483 PrettyMethod(local_method).c_str(), 3484 super_mh.GetDeclaringClassDescriptor()); 3485 return false; 3486 } 3487 vtable->Set(j, local_method); 3488 local_method->SetMethodIndex(j); 3489 break; 3490 } else { 3491 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3492 << " would have incorrectly overridden the package-private method in " 3493 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3494 } 3495 } 3496 } 3497 if (j == actual_count) { 3498 // Not overriding, append. 3499 vtable->Set(actual_count, local_method); 3500 local_method->SetMethodIndex(actual_count); 3501 actual_count += 1; 3502 } 3503 } 3504 if (!IsUint(16, actual_count)) { 3505 ThrowClassFormatError(klass.get(), "Too many methods defined on class: %zd", actual_count); 3506 return false; 3507 } 3508 // Shrink vtable if possible 3509 CHECK_LE(actual_count, max_count); 3510 if (actual_count < max_count) { 3511 vtable.reset(vtable->CopyOf(self, actual_count)); 3512 if (UNLIKELY(vtable.get() == NULL)) { 3513 CHECK(self->IsExceptionPending()); // OOME. 3514 return false; 3515 } 3516 } 3517 klass->SetVTable(vtable.get()); 3518 } else { 3519 CHECK(klass.get() == GetClassRoot(kJavaLangObject)); 3520 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3521 if (!IsUint(16, num_virtual_methods)) { 3522 ThrowClassFormatError(klass.get(), "Too many methods: %d", num_virtual_methods); 3523 return false; 3524 } 3525 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3526 vtable(self, AllocArtMethodArray(self, num_virtual_methods)); 3527 if (UNLIKELY(vtable.get() == NULL)) { 3528 CHECK(self->IsExceptionPending()); // OOME. 3529 return false; 3530 } 3531 for (size_t i = 0; i < num_virtual_methods; ++i) { 3532 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3533 vtable->Set(i, virtual_method); 3534 virtual_method->SetMethodIndex(i & 0xFFFF); 3535 } 3536 klass->SetVTable(vtable.get()); 3537 } 3538 return true; 3539} 3540 3541bool ClassLinker::LinkInterfaceMethods(const SirtRef<mirror::Class>& klass, 3542 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3543 // Set the imt table to be all conflicts by default. 3544 klass->SetImTable(Runtime::Current()->GetDefaultImt()); 3545 size_t super_ifcount; 3546 if (klass->HasSuperClass()) { 3547 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3548 } else { 3549 super_ifcount = 0; 3550 } 3551 size_t ifcount = super_ifcount; 3552 uint32_t num_interfaces; 3553 { 3554 ClassHelper kh(klass.get()); 3555 num_interfaces = 3556 interfaces.get() == nullptr ? kh.NumDirectInterfaces() : interfaces->GetLength(); 3557 ifcount += num_interfaces; 3558 for (size_t i = 0; i < num_interfaces; i++) { 3559 mirror::Class* interface = 3560 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3561 ifcount += interface->GetIfTableCount(); 3562 } 3563 } 3564 if (ifcount == 0) { 3565 // Class implements no interfaces. 3566 DCHECK_EQ(klass->GetIfTableCount(), 0); 3567 DCHECK(klass->GetIfTable() == NULL); 3568 return true; 3569 } 3570 if (ifcount == super_ifcount) { 3571 // Class implements same interfaces as parent, are any of these not marker interfaces? 3572 bool has_non_marker_interface = false; 3573 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3574 for (size_t i = 0; i < ifcount; ++i) { 3575 if (super_iftable->GetMethodArrayCount(i) > 0) { 3576 has_non_marker_interface = true; 3577 break; 3578 } 3579 } 3580 if (!has_non_marker_interface) { 3581 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3582 klass->SetIfTable(super_iftable); 3583 return true; 3584 } 3585 } 3586 Thread* self = Thread::Current(); 3587 SirtRef<mirror::IfTable> iftable(self, AllocIfTable(self, ifcount)); 3588 if (UNLIKELY(iftable.get() == NULL)) { 3589 CHECK(self->IsExceptionPending()); // OOME. 3590 return false; 3591 } 3592 if (super_ifcount != 0) { 3593 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3594 for (size_t i = 0; i < super_ifcount; i++) { 3595 mirror::Class* super_interface = super_iftable->GetInterface(i); 3596 iftable->SetInterface(i, super_interface); 3597 } 3598 } 3599 // Flatten the interface inheritance hierarchy. 3600 size_t idx = super_ifcount; 3601 for (size_t i = 0; i < num_interfaces; i++) { 3602 ClassHelper kh(klass.get()); 3603 mirror::Class* interface = 3604 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3605 DCHECK(interface != NULL); 3606 if (!interface->IsInterface()) { 3607 ClassHelper ih(interface); 3608 ThrowIncompatibleClassChangeError(klass.get(), "Class %s implements non-interface class %s", 3609 PrettyDescriptor(klass.get()).c_str(), 3610 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3611 return false; 3612 } 3613 // Check if interface is already in iftable 3614 bool duplicate = false; 3615 for (size_t j = 0; j < idx; j++) { 3616 mirror::Class* existing_interface = iftable->GetInterface(j); 3617 if (existing_interface == interface) { 3618 duplicate = true; 3619 break; 3620 } 3621 } 3622 if (!duplicate) { 3623 // Add this non-duplicate interface. 3624 iftable->SetInterface(idx++, interface); 3625 // Add this interface's non-duplicate super-interfaces. 3626 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3627 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3628 bool super_duplicate = false; 3629 for (size_t k = 0; k < idx; k++) { 3630 mirror::Class* existing_interface = iftable->GetInterface(k); 3631 if (existing_interface == super_interface) { 3632 super_duplicate = true; 3633 break; 3634 } 3635 } 3636 if (!super_duplicate) { 3637 iftable->SetInterface(idx++, super_interface); 3638 } 3639 } 3640 } 3641 } 3642 // Shrink iftable in case duplicates were found 3643 if (idx < ifcount) { 3644 iftable.reset(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3645 if (UNLIKELY(iftable.get() == NULL)) { 3646 CHECK(self->IsExceptionPending()); // OOME. 3647 return false; 3648 } 3649 ifcount = idx; 3650 } else { 3651 CHECK_EQ(idx, ifcount); 3652 } 3653 klass->SetIfTable(iftable.get()); 3654 3655 // If we're an interface, we don't need the vtable pointers, so we're done. 3656 if (klass->IsInterface()) { 3657 return true; 3658 } 3659 // Allocate imtable 3660 bool imtable_changed = false; 3661 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > imtable(self, AllocArtMethodArray(self, kImtSize)); 3662 if (UNLIKELY(imtable.get() == NULL)) { 3663 CHECK(self->IsExceptionPending()); // OOME. 3664 return false; 3665 } 3666 std::vector<mirror::ArtMethod*> miranda_list; 3667 for (size_t i = 0; i < ifcount; ++i) { 3668 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 3669 if (num_methods > 0) { 3670 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3671 method_array(self, AllocArtMethodArray(self, num_methods)); 3672 if (UNLIKELY(method_array.get() == nullptr)) { 3673 CHECK(self->IsExceptionPending()); // OOME. 3674 return false; 3675 } 3676 iftable->SetMethodArray(i, method_array.get()); 3677 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > vtable(self, 3678 klass->GetVTableDuringLinking()); 3679 for (size_t j = 0; j < num_methods; ++j) { 3680 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 3681 MethodHelper interface_mh(interface_method); 3682 int32_t k; 3683 // For each method listed in the interface's method list, find the 3684 // matching method in our class's method list. We want to favor the 3685 // subclass over the superclass, which just requires walking 3686 // back from the end of the vtable. (This only matters if the 3687 // superclass defines a private method and this class redefines 3688 // it -- otherwise it would use the same vtable slot. In .dex files 3689 // those don't end up in the virtual method table, so it shouldn't 3690 // matter which direction we go. We walk it backward anyway.) 3691 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3692 mirror::ArtMethod* vtable_method = vtable->Get(k); 3693 MethodHelper vtable_mh(vtable_method); 3694 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3695 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3696 ThrowIllegalAccessError(klass.get(), 3697 "Method '%s' implementing interface method '%s' is not public", 3698 PrettyMethod(vtable_method).c_str(), 3699 PrettyMethod(interface_method).c_str()); 3700 return false; 3701 } 3702 method_array->Set(j, vtable_method); 3703 // Place method in imt if entry is empty, place conflict otherwise. 3704 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3705 if (imtable->Get(imt_index) == NULL) { 3706 imtable->Set(imt_index, vtable_method); 3707 imtable_changed = true; 3708 } else { 3709 imtable->Set(imt_index, Runtime::Current()->GetImtConflictMethod()); 3710 } 3711 break; 3712 } 3713 } 3714 if (k < 0) { 3715 SirtRef<mirror::ArtMethod> miranda_method(self, NULL); 3716 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3717 mirror::ArtMethod* mir_method = miranda_list[mir]; 3718 MethodHelper vtable_mh(mir_method); 3719 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3720 miranda_method.reset(miranda_list[mir]); 3721 break; 3722 } 3723 } 3724 if (miranda_method.get() == NULL) { 3725 // Point the interface table at a phantom slot. 3726 miranda_method.reset(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3727 if (UNLIKELY(miranda_method.get() == NULL)) { 3728 CHECK(self->IsExceptionPending()); // OOME. 3729 return false; 3730 } 3731 // TODO: If a methods move then the miranda_list may hold stale references. 3732 miranda_list.push_back(miranda_method.get()); 3733 } 3734 method_array->Set(j, miranda_method.get()); 3735 } 3736 } 3737 } 3738 } 3739 if (imtable_changed) { 3740 // Fill in empty entries in interface method table with conflict. 3741 mirror::ArtMethod* imt_conflict_method = Runtime::Current()->GetImtConflictMethod(); 3742 for (size_t i = 0; i < kImtSize; i++) { 3743 if (imtable->Get(i) == NULL) { 3744 imtable->Set(i, imt_conflict_method); 3745 } 3746 } 3747 klass->SetImTable(imtable.get()); 3748 } 3749 if (!miranda_list.empty()) { 3750 int old_method_count = klass->NumVirtualMethods(); 3751 int new_method_count = old_method_count + miranda_list.size(); 3752 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3753 if (old_method_count == 0) { 3754 virtuals = AllocArtMethodArray(self, new_method_count); 3755 } else { 3756 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3757 } 3758 if (UNLIKELY(virtuals == NULL)) { 3759 CHECK(self->IsExceptionPending()); // OOME. 3760 return false; 3761 } 3762 klass->SetVirtualMethods(virtuals); 3763 3764 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3765 vtable(self, klass->GetVTableDuringLinking()); 3766 CHECK(vtable.get() != NULL); 3767 int old_vtable_count = vtable->GetLength(); 3768 int new_vtable_count = old_vtable_count + miranda_list.size(); 3769 vtable.reset(vtable->CopyOf(self, new_vtable_count)); 3770 if (UNLIKELY(vtable.get() == NULL)) { 3771 CHECK(self->IsExceptionPending()); // OOME. 3772 return false; 3773 } 3774 for (size_t i = 0; i < miranda_list.size(); ++i) { 3775 mirror::ArtMethod* method = miranda_list[i]; 3776 // Leave the declaring class alone as type indices are relative to it 3777 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3778 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3779 klass->SetVirtualMethod(old_method_count + i, method); 3780 vtable->Set(old_vtable_count + i, method); 3781 } 3782 // TODO: do not assign to the vtable field until it is fully constructed. 3783 klass->SetVTable(vtable.get()); 3784 } 3785 3786 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3787 for (int i = 0; i < vtable->GetLength(); ++i) { 3788 CHECK(vtable->Get(i) != NULL); 3789 } 3790 3791// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3792 3793 return true; 3794} 3795 3796bool ClassLinker::LinkInstanceFields(const SirtRef<mirror::Class>& klass) { 3797 CHECK(klass.get() != NULL); 3798 return LinkFields(klass, false); 3799} 3800 3801bool ClassLinker::LinkStaticFields(const SirtRef<mirror::Class>& klass) { 3802 CHECK(klass.get() != NULL); 3803 size_t allocated_class_size = klass->GetClassSize(); 3804 bool success = LinkFields(klass, true); 3805 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3806 return success; 3807} 3808 3809struct LinkFieldsComparator { 3810 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3811 } 3812 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3813 bool operator()(const mirror::ArtField* field1, const mirror::ArtField* field2) 3814 NO_THREAD_SAFETY_ANALYSIS { 3815 // First come reference fields, then 64-bit, and finally 32-bit 3816 FieldHelper fh1(field1); 3817 Primitive::Type type1 = fh1.GetTypeAsPrimitiveType(); 3818 FieldHelper fh2(field2); 3819 Primitive::Type type2 = fh2.GetTypeAsPrimitiveType(); 3820 bool isPrimitive1 = type1 != Primitive::kPrimNot; 3821 bool isPrimitive2 = type2 != Primitive::kPrimNot; 3822 bool is64bit1 = isPrimitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3823 bool is64bit2 = isPrimitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3824 int order1 = (!isPrimitive1 ? 0 : (is64bit1 ? 1 : 2)); 3825 int order2 = (!isPrimitive2 ? 0 : (is64bit2 ? 1 : 2)); 3826 if (order1 != order2) { 3827 return order1 < order2; 3828 } 3829 3830 // same basic group? then sort by string. 3831 const char* name1 = fh1.GetName(); 3832 const char* name2 = fh2.GetName(); 3833 return strcmp(name1, name2) < 0; 3834 } 3835}; 3836 3837bool ClassLinker::LinkFields(const SirtRef<mirror::Class>& klass, bool is_static) { 3838 size_t num_fields = 3839 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3840 3841 mirror::ObjectArray<mirror::ArtField>* fields = 3842 is_static ? klass->GetSFields() : klass->GetIFields(); 3843 3844 // Initialize size and field_offset 3845 size_t size; 3846 MemberOffset field_offset(0); 3847 if (is_static) { 3848 size = klass->GetClassSize(); 3849 field_offset = mirror::Class::FieldsOffset(); 3850 } else { 3851 mirror::Class* super_class = klass->GetSuperClass(); 3852 if (super_class != NULL) { 3853 CHECK(super_class->IsResolved()); 3854 field_offset = MemberOffset(super_class->GetObjectSize()); 3855 } 3856 size = field_offset.Uint32Value(); 3857 } 3858 3859 CHECK_EQ(num_fields == 0, fields == NULL); 3860 3861 // we want a relatively stable order so that adding new fields 3862 // minimizes disruption of C++ version such as Class and Method. 3863 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3864 for (size_t i = 0; i < num_fields; i++) { 3865 mirror::ArtField* f = fields->Get(i); 3866 CHECK(f != NULL); 3867 grouped_and_sorted_fields.push_back(f); 3868 } 3869 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 3870 LinkFieldsComparator()); 3871 3872 // References should be at the front. 3873 size_t current_field = 0; 3874 size_t num_reference_fields = 0; 3875 for (; current_field < num_fields; current_field++) { 3876 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3877 FieldHelper fh(field); 3878 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3879 bool isPrimitive = type != Primitive::kPrimNot; 3880 if (isPrimitive) { 3881 break; // past last reference, move on to the next phase 3882 } 3883 grouped_and_sorted_fields.pop_front(); 3884 num_reference_fields++; 3885 fields->Set(current_field, field); 3886 field->SetOffset(field_offset); 3887 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3888 } 3889 3890 // Now we want to pack all of the double-wide fields together. If 3891 // we're not aligned, though, we want to shuffle one 32-bit field 3892 // into place. If we can't find one, we'll have to pad it. 3893 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3894 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3895 mirror::ArtField* field = grouped_and_sorted_fields[i]; 3896 FieldHelper fh(field); 3897 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3898 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3899 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 3900 continue; 3901 } 3902 fields->Set(current_field++, field); 3903 field->SetOffset(field_offset); 3904 // drop the consumed field 3905 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 3906 break; 3907 } 3908 // whether we found a 32-bit field for padding or not, we advance 3909 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3910 } 3911 3912 // Alignment is good, shuffle any double-wide fields forward, and 3913 // finish assigning field offsets to all fields. 3914 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 3915 while (!grouped_and_sorted_fields.empty()) { 3916 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3917 grouped_and_sorted_fields.pop_front(); 3918 FieldHelper fh(field); 3919 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3920 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3921 fields->Set(current_field, field); 3922 field->SetOffset(field_offset); 3923 field_offset = MemberOffset(field_offset.Uint32Value() + 3924 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 3925 ? sizeof(uint64_t) 3926 : sizeof(uint32_t))); 3927 current_field++; 3928 } 3929 3930 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 3931 if (!is_static && 3932 (strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0)) { 3933 // We know there are no non-reference fields in the Reference classes, and we know 3934 // that 'referent' is alphabetically last, so this is easy... 3935 CHECK_EQ(num_reference_fields, num_fields); 3936 FieldHelper fh(fields->Get(num_fields - 1)); 3937 CHECK_STREQ(fh.GetName(), "referent"); 3938 --num_reference_fields; 3939 } 3940 3941 if (kIsDebugBuild) { 3942 // Make sure that all reference fields appear before 3943 // non-reference fields, and all double-wide fields are aligned. 3944 bool seen_non_ref = false; 3945 for (size_t i = 0; i < num_fields; i++) { 3946 mirror::ArtField* field = fields->Get(i); 3947 if (false) { // enable to debug field layout 3948 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 3949 << " class=" << PrettyClass(klass.get()) 3950 << " field=" << PrettyField(field) 3951 << " offset=" << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset()), 3952 false); 3953 } 3954 FieldHelper fh(field); 3955 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3956 bool is_primitive = type != Primitive::kPrimNot; 3957 if ((strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0) 3958 && (strcmp("referent", fh.GetName()) == 0)) { 3959 is_primitive = true; // We lied above, so we have to expect a lie here. 3960 } 3961 if (is_primitive) { 3962 if (!seen_non_ref) { 3963 seen_non_ref = true; 3964 DCHECK_EQ(num_reference_fields, i); 3965 } 3966 } else { 3967 DCHECK(!seen_non_ref); 3968 } 3969 } 3970 if (!seen_non_ref) { 3971 DCHECK_EQ(num_fields, num_reference_fields); 3972 } 3973 } 3974 size = field_offset.Uint32Value(); 3975 // Update klass 3976 if (is_static) { 3977 klass->SetNumReferenceStaticFields(num_reference_fields); 3978 klass->SetClassSize(size); 3979 } else { 3980 klass->SetNumReferenceInstanceFields(num_reference_fields); 3981 if (!klass->IsVariableSize()) { 3982 DCHECK_GE(size, sizeof(mirror::Object)) << ClassHelper(klass.get()).GetDescriptor(); 3983 size_t previous_size = klass->GetObjectSize(); 3984 if (previous_size != 0) { 3985 // Make sure that we didn't originally have an incorrect size. 3986 CHECK_EQ(previous_size, size); 3987 } 3988 klass->SetObjectSize(size); 3989 } 3990 } 3991 return true; 3992} 3993 3994// Set the bitmap of reference offsets, refOffsets, from the ifields 3995// list. 3996void ClassLinker::CreateReferenceInstanceOffsets(const SirtRef<mirror::Class>& klass) { 3997 uint32_t reference_offsets = 0; 3998 mirror::Class* super_class = klass->GetSuperClass(); 3999 if (super_class != NULL) { 4000 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4001 // If our superclass overflowed, we don't stand a chance. 4002 if (reference_offsets == CLASS_WALK_SUPER) { 4003 klass->SetReferenceInstanceOffsets(reference_offsets); 4004 return; 4005 } 4006 } 4007 CreateReferenceOffsets(klass, false, reference_offsets); 4008} 4009 4010void ClassLinker::CreateReferenceStaticOffsets(const SirtRef<mirror::Class>& klass) { 4011 CreateReferenceOffsets(klass, true, 0); 4012} 4013 4014void ClassLinker::CreateReferenceOffsets(const SirtRef<mirror::Class>& klass, bool is_static, 4015 uint32_t reference_offsets) { 4016 size_t num_reference_fields = 4017 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4018 : klass->NumReferenceInstanceFieldsDuringLinking(); 4019 const mirror::ObjectArray<mirror::ArtField>* fields = 4020 is_static ? klass->GetSFields() : klass->GetIFields(); 4021 // All of the fields that contain object references are guaranteed 4022 // to be at the beginning of the fields list. 4023 for (size_t i = 0; i < num_reference_fields; ++i) { 4024 // Note that byte_offset is the offset from the beginning of 4025 // object, not the offset into instance data 4026 const mirror::ArtField* field = fields->Get(i); 4027 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4028 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4029 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4030 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4031 CHECK_NE(new_bit, 0U); 4032 reference_offsets |= new_bit; 4033 } else { 4034 reference_offsets = CLASS_WALK_SUPER; 4035 break; 4036 } 4037 } 4038 // Update fields in klass 4039 if (is_static) { 4040 klass->SetReferenceStaticOffsets(reference_offsets); 4041 } else { 4042 klass->SetReferenceInstanceOffsets(reference_offsets); 4043 } 4044} 4045 4046mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4047 const SirtRef<mirror::DexCache>& dex_cache) { 4048 DCHECK(dex_cache.get() != nullptr); 4049 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4050 if (resolved != NULL) { 4051 return resolved; 4052 } 4053 uint32_t utf16_length; 4054 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4055 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4056 dex_cache->SetResolvedString(string_idx, string); 4057 return string; 4058} 4059 4060mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4061 const mirror::Class* referrer) { 4062 Thread* self = Thread::Current(); 4063 SirtRef<mirror::DexCache> dex_cache(self, referrer->GetDexCache()); 4064 SirtRef<mirror::ClassLoader> class_loader(self, referrer->GetClassLoader()); 4065 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4066} 4067 4068mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4069 const SirtRef<mirror::DexCache>& dex_cache, 4070 const SirtRef<mirror::ClassLoader>& class_loader) { 4071 DCHECK(dex_cache.get() != NULL); 4072 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4073 if (resolved == NULL) { 4074 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4075 resolved = FindClass(descriptor, class_loader); 4076 if (resolved != NULL) { 4077 // TODO: we used to throw here if resolved's class loader was not the 4078 // boot class loader. This was to permit different classes with the 4079 // same name to be loaded simultaneously by different loaders 4080 dex_cache->SetResolvedType(type_idx, resolved); 4081 } else { 4082 Thread* self = Thread::Current(); 4083 CHECK(self->IsExceptionPending()) 4084 << "Expected pending exception for failed resolution of: " << descriptor; 4085 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4086 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 4087 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4088 DCHECK(resolved == NULL); // No SirtRef needed to preserve resolved. 4089 Thread::Current()->ClearException(); 4090 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4091 self->GetException(NULL)->SetCause(cause.get()); 4092 } 4093 } 4094 } 4095 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4096 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4097 return resolved; 4098} 4099 4100mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 4101 uint32_t method_idx, 4102 const SirtRef<mirror::DexCache>& dex_cache, 4103 const SirtRef<mirror::ClassLoader>& class_loader, 4104 const mirror::ArtMethod* referrer, 4105 InvokeType type) { 4106 DCHECK(dex_cache.get() != NULL); 4107 // Check for hit in the dex cache. 4108 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4109 if (resolved != NULL && !resolved->IsRuntimeMethod()) { 4110 return resolved; 4111 } 4112 // Fail, get the declaring class. 4113 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4114 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4115 if (klass == NULL) { 4116 DCHECK(Thread::Current()->IsExceptionPending()); 4117 return NULL; 4118 } 4119 // Scan using method_idx, this saves string compares but will only hit for matching dex 4120 // caches/files. 4121 switch (type) { 4122 case kDirect: // Fall-through. 4123 case kStatic: 4124 resolved = klass->FindDirectMethod(dex_cache.get(), method_idx); 4125 break; 4126 case kInterface: 4127 resolved = klass->FindInterfaceMethod(dex_cache.get(), method_idx); 4128 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4129 break; 4130 case kSuper: // Fall-through. 4131 case kVirtual: 4132 resolved = klass->FindVirtualMethod(dex_cache.get(), method_idx); 4133 break; 4134 default: 4135 LOG(FATAL) << "Unreachable - invocation type: " << type; 4136 } 4137 if (resolved == NULL) { 4138 // Search by name, which works across dex files. 4139 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4140 const Signature signature = dex_file.GetMethodSignature(method_id); 4141 switch (type) { 4142 case kDirect: // Fall-through. 4143 case kStatic: 4144 resolved = klass->FindDirectMethod(name, signature); 4145 break; 4146 case kInterface: 4147 resolved = klass->FindInterfaceMethod(name, signature); 4148 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4149 break; 4150 case kSuper: // Fall-through. 4151 case kVirtual: 4152 resolved = klass->FindVirtualMethod(name, signature); 4153 break; 4154 } 4155 } 4156 if (resolved != NULL) { 4157 // We found a method, check for incompatible class changes. 4158 if (resolved->CheckIncompatibleClassChange(type)) { 4159 resolved = NULL; 4160 } 4161 } 4162 if (resolved != NULL) { 4163 // Be a good citizen and update the dex cache to speed subsequent calls. 4164 dex_cache->SetResolvedMethod(method_idx, resolved); 4165 return resolved; 4166 } else { 4167 // We failed to find the method which means either an access error, an incompatible class 4168 // change, or no such method. First try to find the method among direct and virtual methods. 4169 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4170 const Signature signature = dex_file.GetMethodSignature(method_id); 4171 switch (type) { 4172 case kDirect: 4173 case kStatic: 4174 resolved = klass->FindVirtualMethod(name, signature); 4175 break; 4176 case kInterface: 4177 case kVirtual: 4178 case kSuper: 4179 resolved = klass->FindDirectMethod(name, signature); 4180 break; 4181 } 4182 4183 // If we found something, check that it can be accessed by the referrer. 4184 if (resolved != NULL && referrer != NULL) { 4185 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4186 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4187 if (!referring_class->CanAccess(methods_class)) { 4188 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4189 resolved, type); 4190 return NULL; 4191 } else if (!referring_class->CanAccessMember(methods_class, 4192 resolved->GetAccessFlags())) { 4193 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4194 return NULL; 4195 } 4196 } 4197 4198 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4199 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4200 switch (type) { 4201 case kDirect: 4202 case kStatic: 4203 if (resolved != NULL) { 4204 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4205 } else { 4206 resolved = klass->FindInterfaceMethod(name, signature); 4207 if (resolved != NULL) { 4208 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4209 } else { 4210 ThrowNoSuchMethodError(type, klass, name, signature); 4211 } 4212 } 4213 break; 4214 case kInterface: 4215 if (resolved != NULL) { 4216 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4217 } else { 4218 resolved = klass->FindVirtualMethod(name, signature); 4219 if (resolved != NULL) { 4220 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4221 } else { 4222 ThrowNoSuchMethodError(type, klass, name, signature); 4223 } 4224 } 4225 break; 4226 case kSuper: 4227 ThrowNoSuchMethodError(type, klass, name, signature); 4228 break; 4229 case kVirtual: 4230 if (resolved != NULL) { 4231 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4232 } else { 4233 resolved = klass->FindInterfaceMethod(name, signature); 4234 if (resolved != NULL) { 4235 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4236 } else { 4237 ThrowNoSuchMethodError(type, klass, name, signature); 4238 } 4239 } 4240 break; 4241 } 4242 DCHECK(Thread::Current()->IsExceptionPending()); 4243 return NULL; 4244 } 4245} 4246 4247mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4248 const SirtRef<mirror::DexCache>& dex_cache, 4249 const SirtRef<mirror::ClassLoader>& class_loader, 4250 bool is_static) { 4251 DCHECK(dex_cache.get() != nullptr); 4252 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4253 if (resolved != NULL) { 4254 return resolved; 4255 } 4256 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4257 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4258 if (klass == NULL) { 4259 DCHECK(Thread::Current()->IsExceptionPending()); 4260 return NULL; 4261 } 4262 4263 if (is_static) { 4264 resolved = klass->FindStaticField(dex_cache.get(), field_idx); 4265 } else { 4266 resolved = klass->FindInstanceField(dex_cache.get(), field_idx); 4267 } 4268 4269 if (resolved == NULL) { 4270 const char* name = dex_file.GetFieldName(field_id); 4271 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4272 if (is_static) { 4273 resolved = klass->FindStaticField(name, type); 4274 } else { 4275 resolved = klass->FindInstanceField(name, type); 4276 } 4277 if (resolved == NULL) { 4278 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 4279 return NULL; 4280 } 4281 } 4282 dex_cache->SetResolvedField(field_idx, resolved); 4283 return resolved; 4284} 4285 4286mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4287 uint32_t field_idx, 4288 const SirtRef<mirror::DexCache>& dex_cache, 4289 const SirtRef<mirror::ClassLoader>& class_loader) { 4290 DCHECK(dex_cache.get() != nullptr); 4291 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4292 if (resolved != NULL) { 4293 return resolved; 4294 } 4295 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4296 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4297 if (klass == NULL) { 4298 DCHECK(Thread::Current()->IsExceptionPending()); 4299 return NULL; 4300 } 4301 4302 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4303 StringPiece type(dex_file.StringDataByIdx( 4304 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4305 resolved = klass->FindField(name, type); 4306 if (resolved != NULL) { 4307 dex_cache->SetResolvedField(field_idx, resolved); 4308 } else { 4309 ThrowNoSuchFieldError("", klass, type, name); 4310 } 4311 return resolved; 4312} 4313 4314const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4315 uint32_t* length) { 4316 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4317 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4318 const DexFile& dex_file = *dex_cache->GetDexFile(); 4319 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4320 return dex_file.GetMethodShorty(method_id, length); 4321} 4322 4323void ClassLinker::DumpAllClasses(int flags) { 4324 if (dex_cache_image_class_lookup_required_) { 4325 MoveImageClassesToClassTable(); 4326 } 4327 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4328 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4329 std::vector<mirror::Class*> all_classes; 4330 { 4331 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4332 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 4333 all_classes.push_back(it.second); 4334 } 4335 } 4336 4337 for (size_t i = 0; i < all_classes.size(); ++i) { 4338 all_classes[i]->DumpClass(std::cerr, flags); 4339 } 4340} 4341 4342void ClassLinker::DumpForSigQuit(std::ostream& os) { 4343 if (dex_cache_image_class_lookup_required_) { 4344 MoveImageClassesToClassTable(); 4345 } 4346 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4347 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4348} 4349 4350size_t ClassLinker::NumLoadedClasses() { 4351 if (dex_cache_image_class_lookup_required_) { 4352 MoveImageClassesToClassTable(); 4353 } 4354 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4355 return class_table_.size(); 4356} 4357 4358pid_t ClassLinker::GetClassesLockOwner() { 4359 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4360} 4361 4362pid_t ClassLinker::GetDexLockOwner() { 4363 return dex_lock_.GetExclusiveOwnerTid(); 4364} 4365 4366void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4367 DCHECK(!init_done_); 4368 4369 DCHECK(klass != NULL); 4370 DCHECK(klass->GetClassLoader() == NULL); 4371 4372 DCHECK(class_roots_ != NULL); 4373 DCHECK(class_roots_->Get(class_root) == NULL); 4374 class_roots_->Set(class_root, klass); 4375} 4376 4377} // namespace art 4378