class_linker.cc revision d2fe10a3a34af171bf1631219cd2d6ff6b7778b5
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 if (kIsDebugBuild) { 653 for (size_t i = 0; i < oat_files_.size(); ++i) { 654 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 655 } 656 } 657 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 658 oat_files_.push_back(oat_file); 659 return oat_file; 660} 661 662OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 663 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 664 OatFile* oat_file = space->ReleaseOatFile(); 665 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 666 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 667 return *oat_file; 668} 669 670const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 671 const char* dex_location = dex_file.GetLocation().c_str(); 672 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 673 return FindOpenedOatFileFromDexLocation(dex_location, &dex_location_checksum); 674} 675 676const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation(const char* dex_location, 677 const uint32_t* const dex_location_checksum) { 678 ReaderMutexLock mu(Thread::Current(), dex_lock_); 679 for (size_t i = 0; i < oat_files_.size(); i++) { 680 const OatFile* oat_file = oat_files_[i]; 681 DCHECK(oat_file != NULL); 682 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 683 dex_location_checksum, 684 false); 685 if (oat_dex_file != NULL) { 686 return oat_file; 687 } 688 } 689 return NULL; 690} 691 692const DexFile* ClassLinker::FindDexFileInOatLocation(const char* dex_location, 693 uint32_t dex_location_checksum, 694 const char* oat_location, 695 std::string* error_msg) { 696 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 697 !Runtime::Current()->IsCompiler(), 698 error_msg)); 699 if (oat_file.get() == nullptr) { 700 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 701 error_msg->c_str()); 702 return nullptr; 703 } 704 Runtime* runtime = Runtime::Current(); 705 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 706 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 707 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 708 if (expected_image_oat_checksum != actual_image_oat_checksum) { 709 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 710 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 711 actual_image_oat_checksum); 712 return nullptr; 713 } 714 715 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 716 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 717 if (expected_image_oat_offset != actual_image_oat_offset) { 718 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 719 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 720 actual_image_oat_offset); 721 return nullptr; 722 } 723 // TODO: this registers the oat file now as we may use the oat_dex_file later and we want the 724 // intern behavior of RegisterOatFile. However, if we take an early return we could remove 725 // the oat file. 726 const OatFile* opened_oat_file = RegisterOatFile(oat_file.release()); 727 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, 728 &dex_location_checksum); 729 if (oat_dex_file == nullptr) { 730 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 731 dex_location); 732 return nullptr; 733 } 734 uint32_t expected_dex_checksum = dex_location_checksum; 735 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 736 if (expected_dex_checksum != actual_dex_checksum) { 737 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 738 "found 0x%x", oat_location, expected_dex_checksum, 739 actual_dex_checksum); 740 return nullptr; 741 } 742 return oat_dex_file->OpenDexFile(error_msg); 743} 744 745class ScopedFlock { 746 public: 747 ScopedFlock() {} 748 749 bool Init(const char* filename, std::string* error_msg) { 750 while (true) { 751 file_.reset(OS::OpenFileWithFlags(filename, O_CREAT | O_RDWR)); 752 if (file_.get() == NULL) { 753 *error_msg = StringPrintf("Failed to open file '%s'", filename); 754 return false; 755 } 756 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_EX)); 757 if (flock_result != 0) { 758 *error_msg = StringPrintf("Failed to lock file '%s': %s", filename, strerror(errno)); 759 return false; 760 } 761 struct stat fstat_stat; 762 int fstat_result = TEMP_FAILURE_RETRY(fstat(file_->Fd(), &fstat_stat)); 763 if (fstat_result != 0) { 764 *error_msg = StringPrintf("Failed to fstat file '%s': %s", filename, strerror(errno)); 765 return false; 766 } 767 struct stat stat_stat; 768 int stat_result = TEMP_FAILURE_RETRY(stat(filename, &stat_stat)); 769 if (stat_result != 0) { 770 PLOG(WARNING) << "Failed to stat, will retry: " << filename; 771 // ENOENT can happen if someone racing with us unlinks the file we created so just retry. 772 continue; 773 } 774 if (fstat_stat.st_dev != stat_stat.st_dev || fstat_stat.st_ino != stat_stat.st_ino) { 775 LOG(WARNING) << "File changed while locking, will retry: " << filename; 776 continue; 777 } 778 return true; 779 } 780 } 781 782 File& GetFile() { 783 return *file_; 784 } 785 786 ~ScopedFlock() { 787 if (file_.get() != NULL) { 788 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_UN)); 789 CHECK_EQ(0, flock_result); 790 } 791 } 792 793 private: 794 UniquePtr<File> file_; 795 796 DISALLOW_COPY_AND_ASSIGN(ScopedFlock); 797}; 798 799const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation(const char* dex_location, 800 uint32_t dex_location_checksum, 801 const char* oat_location, 802 std::string* error_msg) { 803 // We play a locking game here so that if two different processes 804 // race to generate (or worse, one tries to open a partial generated 805 // file) we will be okay. This is actually common with apps that use 806 // DexClassLoader to work around the dex method reference limit and 807 // that have a background service running in a separate process. 808 ScopedFlock scoped_flock; 809 if (!scoped_flock.Init(oat_location, error_msg)) { 810 return nullptr; 811 } 812 813 // Check if we already have an up-to-date output file 814 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, dex_location_checksum, 815 oat_location, error_msg); 816 if (dex_file != nullptr) { 817 return dex_file; 818 } 819 VLOG(class_linker) << "Failed to find dex file '" << dex_location << "' in oat location '" 820 << oat_location << "': " << *error_msg; 821 error_msg->clear(); 822 823 // Generate the output oat file for the dex file 824 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 825 if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location, error_msg)) { 826 CHECK(!error_msg->empty()); 827 return nullptr; 828 } 829 const OatFile* oat_file = OatFile::Open(oat_location, oat_location, NULL, 830 !Runtime::Current()->IsCompiler(), 831 error_msg); 832 if (oat_file == nullptr) { 833 *error_msg = StringPrintf("Failed to open generated oat file '%s': %s", 834 oat_location, error_msg->c_str()); 835 return nullptr; 836 } 837 oat_file = RegisterOatFile(oat_file); 838 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 839 &dex_location_checksum); 840 if (oat_dex_file == nullptr) { 841 *error_msg = StringPrintf("Failed to find dex file '%s' (checksum 0x%x) in generated out file " 842 "'%s'", dex_location, dex_location_checksum, oat_location); 843 return nullptr; 844 } 845 const DexFile* result = oat_dex_file->OpenDexFile(error_msg); 846 CHECK(result != nullptr) << *error_msg; 847 CHECK_EQ(dex_location_checksum, result->GetLocationChecksum()) 848 << "dex_location=" << dex_location << " oat_location=" << oat_location << std::hex 849 << " dex_location_checksum=" << dex_location_checksum 850 << " DexFile::GetLocationChecksum()=" << result->GetLocationChecksum(); 851 return result; 852} 853 854bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 855 const char* dex_location, 856 uint32_t dex_location_checksum, 857 std::string* error_msg) { 858 Runtime* runtime = Runtime::Current(); 859 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 860 uint32_t image_oat_checksum = image_header.GetOatChecksum(); 861 uintptr_t image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 862 bool image_check = ((oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum) 863 && (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 864 865 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 866 if (oat_dex_file == NULL) { 867 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 868 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 869 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 870 for (size_t i = 0; i < oat_dex_files.size(); i++) { 871 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 872 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 873 oat_file->GetLocation().c_str(), 874 oat_dex_file->GetDexFileLocation().c_str()); 875 } 876 return false; 877 } 878 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 879 880 if (image_check && dex_check) { 881 return true; 882 } 883 884 if (!image_check) { 885 ScopedObjectAccess soa(Thread::Current()); 886 mirror::String* oat_location = image_header.GetImageRoot(ImageHeader::kOatLocation)->AsString(); 887 std::string image_file(oat_location->ToModifiedUtf8()); 888 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with '%s' (0x%x, %" PRIdPTR ")", 889 oat_file->GetLocation().c_str(), 890 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 891 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 892 image_file.c_str(), image_oat_checksum, image_oat_data_begin); 893 } 894 if (!dex_check) { 895 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 896 oat_file->GetLocation().c_str(), 897 oat_dex_file->GetDexFileLocationChecksum(), 898 dex_location, dex_location_checksum); 899 } 900 return false; 901} 902 903const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const std::string& oat_file_location, 904 const char* dex_location, 905 std::string* error_msg, 906 bool* open_failed) { 907 UniquePtr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 908 if (oat_file.get() == nullptr) { 909 *open_failed = true; 910 return nullptr; 911 } 912 *open_failed = false; 913 uint32_t dex_location_checksum; 914 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 915 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 916 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 917 // directory. 918 const OatFile* opened_oat_file = oat_file.release(); 919 opened_oat_file = RegisterOatFile(opened_oat_file); 920 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, NULL); 921 if (oat_dex_file == nullptr) { 922 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 923 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 924 error_msg->c_str()); 925 return nullptr; 926 } 927 return oat_dex_file->OpenDexFile(error_msg); 928 } 929 930 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 931 error_msg); 932 if (!verified) { 933 return nullptr; 934 } 935 const OatFile* opened_oat_file = oat_file.release(); 936 opened_oat_file = RegisterOatFile(opened_oat_file); 937 return opened_oat_file->GetOatDexFile(dex_location, 938 &dex_location_checksum)->OpenDexFile(error_msg); 939} 940 941const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const char* dex_location, 942 const uint32_t* const dex_location_checksum, 943 std::string* error_msg) { 944 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location, 945 dex_location_checksum); 946 if (open_oat_file != nullptr) { 947 const OatFile::OatDexFile* oat_dex_file = open_oat_file->GetOatDexFile(dex_location, 948 dex_location_checksum); 949 return oat_dex_file->OpenDexFile(error_msg); 950 } 951 952 // Look for an existing file next to dex. for example, for 953 // /foo/bar/baz.jar, look for /foo/bar/baz.odex. 954 std::string odex_filename(OatFile::DexFilenameToOdexFilename(dex_location)); 955 bool open_failed; 956 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(odex_filename, dex_location, 957 error_msg, &open_failed); 958 if (dex_file != nullptr) { 959 return dex_file; 960 } 961 if (dex_location_checksum == nullptr) { 962 *error_msg = StringPrintf("Failed to open oat file from %s and no classes.dex found in %s: %s", 963 odex_filename.c_str(), dex_location, error_msg->c_str()); 964 return nullptr; 965 } 966 967 std::string cache_error_msg; 968 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location)); 969 dex_file = VerifyAndOpenDexFileFromOatFile(cache_location, dex_location, &cache_error_msg, 970 &open_failed); 971 if (dex_file != nullptr) { 972 return dex_file; 973 } 974 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 975 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 976 } 977 VLOG(class_linker) << "Failed to open oat file from " << odex_filename 978 << " (error '" << *error_msg << "') or " << cache_location 979 << " (error '" << cache_error_msg << "')."; 980 981 // Try to generate oat file if it wasn't found or was obsolete. 982 error_msg->clear(); 983 return FindOrCreateOatFileForDexLocation(dex_location, *dex_location_checksum, 984 cache_location.c_str(), error_msg); 985} 986 987const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 988 ReaderMutexLock mu(Thread::Current(), dex_lock_); 989 for (size_t i = 0; i < oat_files_.size(); i++) { 990 const OatFile* oat_file = oat_files_[i]; 991 DCHECK(oat_file != nullptr); 992 if (oat_file->GetLocation() == oat_location) { 993 return oat_file; 994 } 995 } 996 return nullptr; 997} 998 999const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1000 std::string* error_msg) { 1001 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1002 if (oat_file != nullptr) { 1003 return oat_file; 1004 } 1005 1006 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1007 error_msg); 1008 if (oat_file == NULL) { 1009 return NULL; 1010 } 1011 return oat_file; 1012} 1013 1014static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1015 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1016 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1017 1018 DCHECK(obj != NULL); 1019 DCHECK(class_linker != NULL); 1020 1021 if (obj->IsArtMethod()) { 1022 mirror::ArtMethod* method = obj->AsArtMethod(); 1023 if (!method->IsNative()) { 1024 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1025 if (method != Runtime::Current()->GetResolutionMethod()) { 1026 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1027 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1028 } 1029 } 1030 } 1031} 1032 1033void ClassLinker::InitFromImage() { 1034 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1035 CHECK(!init_done_); 1036 1037 Thread* self = Thread::Current(); 1038 gc::Heap* heap = Runtime::Current()->GetHeap(); 1039 gc::space::ImageSpace* space = heap->GetImageSpace(); 1040 dex_cache_image_class_lookup_required_ = true; 1041 CHECK(space != NULL); 1042 OatFile& oat_file = GetImageOatFile(space); 1043 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1044 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1045 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 1046 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1047 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1048 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1049 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1050 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1051 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1052 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1053 1054 SirtRef<mirror::ObjectArray<mirror::Class> > class_roots( 1055 self, 1056 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>()); 1057 class_roots_ = class_roots.get(); 1058 1059 // Special case of setting up the String class early so that we can test arbitrary objects 1060 // as being Strings or not 1061 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1062 1063 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1064 static_cast<uint32_t>(dex_caches->GetLength())); 1065 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1066 SirtRef<mirror::DexCache> dex_cache(self, dex_caches->Get(i)); 1067 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1068 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1069 nullptr); 1070 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1071 std::string error_msg; 1072 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1073 if (dex_file == NULL) { 1074 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1075 << " from within oat file " << oat_file.GetLocation() 1076 << " error '" << error_msg << "'"; 1077 } 1078 1079 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1080 1081 AppendToBootClassPath(*dex_file, dex_cache); 1082 } 1083 1084 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1085 // bitmap walk. 1086 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1087 1088 // Set entry point to interpreter if in InterpretOnly mode. 1089 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1090 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1091 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1092 } 1093 1094 // reinit class_roots_ 1095 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1096 class_roots_ = class_roots.get(); 1097 1098 // reinit array_iftable_ from any array class instance, they should be == 1099 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1100 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1101 // String class root was set above 1102 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1103 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1104 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1105 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1106 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1107 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1108 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1109 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1110 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1111 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1112 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1113 1114 FinishInit(); 1115 1116 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1117} 1118 1119// Keep in sync with InitCallback. Anything we visit, we need to 1120// reinit references to when reinitializing a ClassLinker from a 1121// mapped image. 1122void ClassLinker::VisitRoots(RootCallback* callback, void* arg, bool only_dirty, bool clean_dirty) { 1123 class_roots_ = down_cast<mirror::ObjectArray<mirror::Class>*>( 1124 callback(class_roots_, arg, 0, kRootVMInternal)); 1125 Thread* self = Thread::Current(); 1126 { 1127 ReaderMutexLock mu(self, dex_lock_); 1128 if (!only_dirty || dex_caches_dirty_) { 1129 for (mirror::DexCache*& dex_cache : dex_caches_) { 1130 dex_cache = down_cast<mirror::DexCache*>(callback(dex_cache, arg, 0, kRootVMInternal)); 1131 DCHECK(dex_cache != nullptr); 1132 } 1133 if (clean_dirty) { 1134 dex_caches_dirty_ = false; 1135 } 1136 } 1137 } 1138 1139 { 1140 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 1141 if (!only_dirty || class_table_dirty_) { 1142 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1143 it.second = down_cast<mirror::Class*>(callback(it.second, arg, 0, kRootStickyClass)); 1144 DCHECK(it.second != nullptr); 1145 } 1146 if (clean_dirty) { 1147 class_table_dirty_ = false; 1148 } 1149 } 1150 1151 // We deliberately ignore the class roots in the image since we 1152 // handle image roots by using the MS/CMS rescanning of dirty cards. 1153 } 1154 1155 array_iftable_ = reinterpret_cast<mirror::IfTable*>(callback(array_iftable_, arg, 0, 1156 kRootVMInternal)); 1157 DCHECK(array_iftable_ != nullptr); 1158} 1159 1160void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1161 if (dex_cache_image_class_lookup_required_) { 1162 MoveImageClassesToClassTable(); 1163 } 1164 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1165 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 1166 if (!visitor(it.second, arg)) { 1167 return; 1168 } 1169 } 1170} 1171 1172static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1173 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1174 classes->insert(c); 1175 return true; 1176} 1177 1178void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1179 std::set<mirror::Class*> classes; 1180 VisitClasses(GetClassesVisitor, &classes); 1181 for (mirror::Class* klass : classes) { 1182 if (!visitor(klass, arg)) { 1183 return; 1184 } 1185 } 1186} 1187 1188ClassLinker::~ClassLinker() { 1189 mirror::Class::ResetClass(); 1190 mirror::String::ResetClass(); 1191 mirror::ArtField::ResetClass(); 1192 mirror::ArtMethod::ResetClass(); 1193 mirror::BooleanArray::ResetArrayClass(); 1194 mirror::ByteArray::ResetArrayClass(); 1195 mirror::CharArray::ResetArrayClass(); 1196 mirror::DoubleArray::ResetArrayClass(); 1197 mirror::FloatArray::ResetArrayClass(); 1198 mirror::IntArray::ResetArrayClass(); 1199 mirror::LongArray::ResetArrayClass(); 1200 mirror::ShortArray::ResetArrayClass(); 1201 mirror::Throwable::ResetClass(); 1202 mirror::StackTraceElement::ResetClass(); 1203 STLDeleteElements(&boot_class_path_); 1204 STLDeleteElements(&oat_files_); 1205} 1206 1207mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1208 gc::Heap* heap = Runtime::Current()->GetHeap(); 1209 SirtRef<mirror::Class> dex_cache_class(self, GetClassRoot(kJavaLangDexCache)); 1210 SirtRef<mirror::DexCache> dex_cache( 1211 self, down_cast<mirror::DexCache*>( 1212 heap->AllocObject<true>(self, dex_cache_class.get(), dex_cache_class->GetObjectSize()))); 1213 if (dex_cache.get() == NULL) { 1214 return NULL; 1215 } 1216 SirtRef<mirror::String> 1217 location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str())); 1218 if (location.get() == NULL) { 1219 return NULL; 1220 } 1221 SirtRef<mirror::ObjectArray<mirror::String> > 1222 strings(self, AllocStringArray(self, dex_file.NumStringIds())); 1223 if (strings.get() == NULL) { 1224 return NULL; 1225 } 1226 SirtRef<mirror::ObjectArray<mirror::Class> > 1227 types(self, AllocClassArray(self, dex_file.NumTypeIds())); 1228 if (types.get() == NULL) { 1229 return NULL; 1230 } 1231 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 1232 methods(self, AllocArtMethodArray(self, dex_file.NumMethodIds())); 1233 if (methods.get() == NULL) { 1234 return NULL; 1235 } 1236 SirtRef<mirror::ObjectArray<mirror::ArtField> > 1237 fields(self, AllocArtFieldArray(self, dex_file.NumFieldIds())); 1238 if (fields.get() == NULL) { 1239 return NULL; 1240 } 1241 dex_cache->Init(&dex_file, location.get(), strings.get(), types.get(), methods.get(), 1242 fields.get()); 1243 return dex_cache.get(); 1244} 1245 1246mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1247 size_t class_size) { 1248 DCHECK_GE(class_size, sizeof(mirror::Class)); 1249 gc::Heap* heap = Runtime::Current()->GetHeap(); 1250 mirror::Object* k = 1251 kMovingClasses ? 1252 heap->AllocObject<true>(self, java_lang_Class, class_size) : 1253 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size); 1254 if (UNLIKELY(k == NULL)) { 1255 CHECK(self->IsExceptionPending()); // OOME. 1256 return NULL; 1257 } 1258 mirror::Class* klass = k->AsClass(); 1259 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1260 klass->SetClassSize(class_size); 1261 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1262 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1263 return klass; 1264} 1265 1266mirror::Class* ClassLinker::AllocClass(Thread* self, size_t class_size) { 1267 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1268} 1269 1270mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1271 return down_cast<mirror::ArtField*>( 1272 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1273} 1274 1275mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1276 return down_cast<mirror::ArtMethod*>( 1277 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1278} 1279 1280mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1281 Thread* self, size_t length) { 1282 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1283 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1284} 1285 1286static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1287 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1288 DCHECK(klass != NULL); 1289 // Wait for the class if it has not already been linked. 1290 if (!klass->IsResolved() && !klass->IsErroneous()) { 1291 SirtRef<mirror::Class> sirt_class(self, klass); 1292 ObjectLock<mirror::Class> lock(self, &sirt_class); 1293 // Check for circular dependencies between classes. 1294 if (!sirt_class->IsResolved() && sirt_class->GetClinitThreadId() == self->GetTid()) { 1295 ThrowClassCircularityError(sirt_class.get()); 1296 sirt_class->SetStatus(mirror::Class::kStatusError, self); 1297 return nullptr; 1298 } 1299 // Wait for the pending initialization to complete. 1300 while (!sirt_class->IsResolved() && !sirt_class->IsErroneous()) { 1301 lock.WaitIgnoringInterrupts(); 1302 } 1303 klass = sirt_class.get(); 1304 } 1305 if (klass->IsErroneous()) { 1306 ThrowEarlierClassFailure(klass); 1307 return nullptr; 1308 } 1309 // Return the loaded class. No exceptions should be pending. 1310 CHECK(klass->IsResolved()) << PrettyClass(klass); 1311 self->AssertNoPendingException(); 1312 return klass; 1313} 1314 1315bool ClassLinker::IsInBootClassPath(const char* descriptor) { 1316 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1317 return pair.second != NULL; 1318} 1319 1320mirror::Class* ClassLinker::FindSystemClass(const char* descriptor) { 1321 SirtRef<mirror::ClassLoader> class_loader(Thread::Current(), nullptr); 1322 return FindClass(descriptor, class_loader); 1323} 1324 1325mirror::Class* ClassLinker::FindClass(const char* descriptor, 1326 const SirtRef<mirror::ClassLoader>& class_loader) { 1327 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1328 Thread* self = Thread::Current(); 1329 DCHECK(self != NULL); 1330 self->AssertNoPendingException(); 1331 if (descriptor[1] == '\0') { 1332 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1333 // for primitive classes that aren't backed by dex files. 1334 return FindPrimitiveClass(descriptor[0]); 1335 } 1336 // Find the class in the loaded classes table. 1337 mirror::Class* klass = LookupClass(descriptor, class_loader.get()); 1338 if (klass != NULL) { 1339 return EnsureResolved(self, klass); 1340 } 1341 // Class is not yet loaded. 1342 if (descriptor[0] == '[') { 1343 return CreateArrayClass(descriptor, class_loader); 1344 } else if (class_loader.get() == nullptr) { 1345 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1346 if (pair.second != NULL) { 1347 SirtRef<mirror::ClassLoader> class_loader(self, nullptr); 1348 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1349 } 1350 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1351 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1352 // throw of a NoClassDefFoundError. 1353 if (IsInBootClassPath(descriptor)) { 1354 mirror::Class* system_class = FindSystemClass(descriptor); 1355 CHECK(system_class != NULL); 1356 return system_class; 1357 } 1358 // Next try the compile time class path. 1359 const std::vector<const DexFile*>* class_path; 1360 { 1361 ScopedObjectAccessUnchecked soa(self); 1362 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1363 soa.AddLocalReference<jobject>(class_loader.get())); 1364 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1365 } 1366 1367 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1368 if (pair.second != NULL) { 1369 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1370 } 1371 1372 } else { 1373 ScopedObjectAccessUnchecked soa(self->GetJniEnv()); 1374 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1375 soa.AddLocalReference<jobject>(class_loader.get())); 1376 std::string class_name_string(DescriptorToDot(descriptor)); 1377 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1378 { 1379 ScopedThreadStateChange tsc(self, kNative); 1380 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1381 soa.Env()->NewStringUTF(class_name_string.c_str())); 1382 if (class_name_object.get() == NULL) { 1383 return NULL; 1384 } 1385 CHECK(class_loader_object.get() != NULL); 1386 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1387 WellKnownClasses::java_lang_ClassLoader_loadClass, 1388 class_name_object.get())); 1389 } 1390 if (soa.Self()->IsExceptionPending()) { 1391 // If the ClassLoader threw, pass that exception up. 1392 return NULL; 1393 } else if (result.get() == NULL) { 1394 // broken loader - throw NPE to be compatible with Dalvik 1395 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1396 class_name_string.c_str()).c_str()); 1397 return NULL; 1398 } else { 1399 // success, return mirror::Class* 1400 return soa.Decode<mirror::Class*>(result.get()); 1401 } 1402 } 1403 1404 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1405 return NULL; 1406} 1407 1408mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1409 const SirtRef<mirror::ClassLoader>& class_loader, 1410 const DexFile& dex_file, 1411 const DexFile::ClassDef& dex_class_def) { 1412 Thread* self = Thread::Current(); 1413 SirtRef<mirror::Class> klass(self, NULL); 1414 // Load the class from the dex file. 1415 if (UNLIKELY(!init_done_)) { 1416 // finish up init of hand crafted class_roots_ 1417 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1418 klass.reset(GetClassRoot(kJavaLangObject)); 1419 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1420 klass.reset(GetClassRoot(kJavaLangClass)); 1421 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1422 klass.reset(GetClassRoot(kJavaLangString)); 1423 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1424 klass.reset(GetClassRoot(kJavaLangDexCache)); 1425 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1426 klass.reset(GetClassRoot(kJavaLangReflectArtField)); 1427 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1428 klass.reset(GetClassRoot(kJavaLangReflectArtMethod)); 1429 } else { 1430 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1431 } 1432 } else { 1433 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1434 } 1435 if (UNLIKELY(klass.get() == NULL)) { 1436 CHECK(self->IsExceptionPending()); // Expect an OOME. 1437 return NULL; 1438 } 1439 klass->SetDexCache(FindDexCache(dex_file)); 1440 LoadClass(dex_file, dex_class_def, klass, class_loader.get()); 1441 // Check for a pending exception during load 1442 if (self->IsExceptionPending()) { 1443 klass->SetStatus(mirror::Class::kStatusError, self); 1444 return NULL; 1445 } 1446 ObjectLock<mirror::Class> lock(self, &klass); 1447 klass->SetClinitThreadId(self->GetTid()); 1448 // Add the newly loaded class to the loaded classes table. 1449 mirror::Class* existing = InsertClass(descriptor, klass.get(), Hash(descriptor)); 1450 if (existing != NULL) { 1451 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1452 // this thread to block. 1453 return EnsureResolved(self, existing); 1454 } 1455 // Finish loading (if necessary) by finding parents 1456 CHECK(!klass->IsLoaded()); 1457 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1458 // Loading failed. 1459 klass->SetStatus(mirror::Class::kStatusError, self); 1460 return NULL; 1461 } 1462 CHECK(klass->IsLoaded()); 1463 // Link the class (if necessary) 1464 CHECK(!klass->IsResolved()); 1465 // TODO: Use fast jobjects? 1466 SirtRef<mirror::ObjectArray<mirror::Class> > interfaces(self, nullptr); 1467 if (!LinkClass(self, klass, interfaces)) { 1468 // Linking failed. 1469 klass->SetStatus(mirror::Class::kStatusError, self); 1470 return NULL; 1471 } 1472 CHECK(klass->IsResolved()); 1473 1474 /* 1475 * We send CLASS_PREPARE events to the debugger from here. The 1476 * definition of "preparation" is creating the static fields for a 1477 * class and initializing them to the standard default values, but not 1478 * executing any code (that comes later, during "initialization"). 1479 * 1480 * We did the static preparation in LinkClass. 1481 * 1482 * The class has been prepared and resolved but possibly not yet verified 1483 * at this point. 1484 */ 1485 Dbg::PostClassPrepare(klass.get()); 1486 1487 return klass.get(); 1488} 1489 1490// Precomputes size that will be needed for Class, matching LinkStaticFields 1491size_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1492 const DexFile::ClassDef& dex_class_def) { 1493 const byte* class_data = dex_file.GetClassData(dex_class_def); 1494 size_t num_ref = 0; 1495 size_t num_32 = 0; 1496 size_t num_64 = 0; 1497 if (class_data != NULL) { 1498 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1499 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1500 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1501 char c = descriptor[0]; 1502 if (c == 'L' || c == '[') { 1503 num_ref++; 1504 } else if (c == 'J' || c == 'D') { 1505 num_64++; 1506 } else { 1507 num_32++; 1508 } 1509 } 1510 } 1511 // start with generic class data 1512 size_t size = sizeof(mirror::Class); 1513 // follow with reference fields which must be contiguous at start 1514 size += (num_ref * sizeof(uint32_t)); 1515 // if there are 64-bit fields to add, make sure they are aligned 1516 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1517 if (num_32 != 0) { 1518 // use an available 32-bit field for padding 1519 num_32--; 1520 } 1521 size += sizeof(uint32_t); // either way, we are adding a word 1522 DCHECK_EQ(size, RoundUp(size, 8)); 1523 } 1524 // tack on any 64-bit fields now that alignment is assured 1525 size += (num_64 * sizeof(uint64_t)); 1526 // tack on any remaining 32-bit fields 1527 size += (num_32 * sizeof(uint32_t)); 1528 return size; 1529} 1530 1531const OatFile::OatClass* ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1532 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1533 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1534 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1535 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1536 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1537 &dex_location_checksum); 1538 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1539 const OatFile::OatClass* oat_class = oat_dex_file->GetOatClass(class_def_idx); 1540 CHECK(oat_class != NULL) << dex_file.GetLocation() << " " << class_def_idx; 1541 return oat_class; 1542} 1543 1544static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1545 uint32_t method_idx) { 1546 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1547 const byte* class_data = dex_file.GetClassData(class_def); 1548 CHECK(class_data != NULL); 1549 ClassDataItemIterator it(dex_file, class_data); 1550 // Skip fields 1551 while (it.HasNextStaticField()) { 1552 it.Next(); 1553 } 1554 while (it.HasNextInstanceField()) { 1555 it.Next(); 1556 } 1557 // Process methods 1558 size_t class_def_method_index = 0; 1559 while (it.HasNextDirectMethod()) { 1560 if (it.GetMemberIndex() == method_idx) { 1561 return class_def_method_index; 1562 } 1563 class_def_method_index++; 1564 it.Next(); 1565 } 1566 while (it.HasNextVirtualMethod()) { 1567 if (it.GetMemberIndex() == method_idx) { 1568 return class_def_method_index; 1569 } 1570 class_def_method_index++; 1571 it.Next(); 1572 } 1573 DCHECK(!it.HasNext()); 1574 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1575 return 0; 1576} 1577 1578const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1579 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1580 // method for direct methods (or virtual methods made direct). 1581 mirror::Class* declaring_class = method->GetDeclaringClass(); 1582 size_t oat_method_index; 1583 if (method->IsStatic() || method->IsDirect()) { 1584 // Simple case where the oat method index was stashed at load time. 1585 oat_method_index = method->GetMethodIndex(); 1586 } else { 1587 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1588 // by search for its position in the declared virtual methods. 1589 oat_method_index = declaring_class->NumDirectMethods(); 1590 size_t end = declaring_class->NumVirtualMethods(); 1591 bool found = false; 1592 for (size_t i = 0; i < end; i++) { 1593 if (declaring_class->GetVirtualMethod(i) == method) { 1594 found = true; 1595 break; 1596 } 1597 oat_method_index++; 1598 } 1599 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1600 } 1601 UniquePtr<const OatFile::OatClass> 1602 oat_class(GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1603 declaring_class->GetDexClassDefIndex())); 1604 CHECK(oat_class.get() != NULL); 1605 DCHECK_EQ(oat_method_index, 1606 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1607 method->GetDeclaringClass()->GetDexClassDefIndex(), 1608 method->GetDexMethodIndex())); 1609 1610 return oat_class->GetOatMethod(oat_method_index); 1611} 1612 1613// Special case to get oat code without overwriting a trampoline. 1614const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1615 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1616 if (method->IsProxyMethod()) { 1617 return GetQuickProxyInvokeHandler(); 1618 } 1619 const void* result = GetOatMethodFor(method).GetQuickCode(); 1620 if (result == nullptr) { 1621 if (method->IsPortableCompiled()) { 1622 // No code? Do we expect portable code? 1623 result = GetQuickToPortableBridge(); 1624 } else { 1625 // No code? You must mean to go into the interpreter. 1626 result = GetQuickToInterpreterBridge(); 1627 } 1628 } 1629 return result; 1630} 1631 1632const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1633 bool* have_portable_code) { 1634 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1635 *have_portable_code = false; 1636 if (method->IsProxyMethod()) { 1637 return GetPortableProxyInvokeHandler(); 1638 } 1639 const void* result = GetOatMethodFor(method).GetPortableCode(); 1640 if (result == nullptr) { 1641 if (GetOatMethodFor(method).GetQuickCode() == nullptr) { 1642 // No code? You must mean to go into the interpreter. 1643 result = GetPortableToInterpreterBridge(); 1644 } else { 1645 // No code? But there's quick code, so use a bridge. 1646 result = GetPortableToQuickBridge(); 1647 } 1648 } else { 1649 *have_portable_code = true; 1650 } 1651 return result; 1652} 1653 1654const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1655 uint32_t method_idx) { 1656 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1657 CHECK(oat_class.get() != nullptr); 1658 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1659 return oat_class->GetOatMethod(oat_method_idx).GetQuickCode(); 1660} 1661 1662const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1663 uint32_t method_idx) { 1664 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1665 CHECK(oat_class.get() != nullptr); 1666 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1667 return oat_class->GetOatMethod(oat_method_idx).GetPortableCode(); 1668} 1669 1670// Returns true if the method must run with interpreter, false otherwise. 1671static bool NeedsInterpreter(mirror::ArtMethod* method, const void* quick_code, 1672 const void* portable_code) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1673 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1674 // No code: need interpreter. 1675 DCHECK(!method->IsNative()); 1676 return true; 1677 } 1678#ifdef ART_SEA_IR_MODE 1679 ScopedObjectAccess soa(Thread::Current()); 1680 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1681 LOG(INFO) << "Found " << PrettyMethod(method); 1682 return false; 1683 } 1684#endif 1685 // If interpreter mode is enabled, every method (except native and proxy) must 1686 // be run with interpreter. 1687 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1688 !method->IsNative() && !method->IsProxyMethod(); 1689} 1690 1691void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1692 if (klass->NumDirectMethods() == 0) { 1693 return; // No direct methods => no static methods. 1694 } 1695 Runtime* runtime = Runtime::Current(); 1696 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1697 return; // OAT file unavailable. 1698 } 1699 ClassHelper kh(klass); 1700 const DexFile& dex_file = kh.GetDexFile(); 1701 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 1702 CHECK(dex_class_def != nullptr); 1703 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1704 // There should always be class data if there were direct methods. 1705 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1706 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1707 CHECK(oat_class.get() != nullptr); 1708 ClassDataItemIterator it(dex_file, class_data); 1709 // Skip fields 1710 while (it.HasNextStaticField()) { 1711 it.Next(); 1712 } 1713 while (it.HasNextInstanceField()) { 1714 it.Next(); 1715 } 1716 // Link the code of methods skipped by LinkCode. 1717 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1718 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1719 if (!method->IsStatic()) { 1720 // Only update static methods. 1721 continue; 1722 } 1723 const void* portable_code = oat_class->GetOatMethod(method_index).GetPortableCode(); 1724 const void* quick_code = oat_class->GetOatMethod(method_index).GetQuickCode(); 1725 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1726 bool have_portable_code = false; 1727 if (enter_interpreter) { 1728 // Use interpreter entry point. 1729 portable_code = GetPortableToInterpreterBridge(); 1730 quick_code = GetQuickToInterpreterBridge(); 1731 } else { 1732 if (portable_code == nullptr) { 1733 portable_code = GetPortableToQuickBridge(); 1734 } else { 1735 have_portable_code = true; 1736 } 1737 if (quick_code == nullptr) { 1738 quick_code = GetQuickToPortableBridge(); 1739 } 1740 } 1741 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1742 have_portable_code); 1743 } 1744 // Ignore virtual methods on the iterator. 1745} 1746 1747static void LinkCode(const SirtRef<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class, 1748 uint32_t method_index) 1749 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1750 // Method shouldn't have already been linked. 1751 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1752 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1753 // Every kind of method should at least get an invoke stub from the oat_method. 1754 // non-abstract methods also get their code pointers. 1755 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1756 oat_method.LinkMethod(method.get()); 1757 1758 // Install entry point from interpreter. 1759 Runtime* runtime = Runtime::Current(); 1760 bool enter_interpreter = NeedsInterpreter(method.get(), 1761 method->GetEntryPointFromQuickCompiledCode(), 1762 method->GetEntryPointFromPortableCompiledCode()); 1763 if (enter_interpreter) { 1764 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1765 } else { 1766 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1767 } 1768 1769 if (method->IsAbstract()) { 1770 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1771 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1772 return; 1773 } 1774 1775 bool have_portable_code = false; 1776 if (method->IsStatic() && !method->IsConstructor()) { 1777 // For static methods excluding the class initializer, install the trampoline. 1778 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1779 // after initializing class (see ClassLinker::InitializeClass method). 1780 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline(runtime->GetClassLinker())); 1781 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline(runtime->GetClassLinker())); 1782 } else if (enter_interpreter) { 1783 // Set entry point from compiled code if there's no code or in interpreter only mode. 1784 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1785 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1786 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1787 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1788 have_portable_code = true; 1789 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1790 } else { 1791 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1792 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1793 } 1794 1795 if (method->IsNative()) { 1796 // Unregistering restores the dlsym lookup stub. 1797 method->UnregisterNative(Thread::Current()); 1798 } 1799 1800 // Allow instrumentation its chance to hijack code. 1801 runtime->GetInstrumentation()->UpdateMethodsCode(method.get(), 1802 method->GetEntryPointFromQuickCompiledCode(), 1803 method->GetEntryPointFromPortableCompiledCode(), 1804 have_portable_code); 1805} 1806 1807void ClassLinker::LoadClass(const DexFile& dex_file, 1808 const DexFile::ClassDef& dex_class_def, 1809 const SirtRef<mirror::Class>& klass, 1810 mirror::ClassLoader* class_loader) { 1811 CHECK(klass.get() != NULL); 1812 CHECK(klass->GetDexCache() != NULL); 1813 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1814 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1815 CHECK(descriptor != NULL); 1816 1817 klass->SetClass(GetClassRoot(kJavaLangClass)); 1818 uint32_t access_flags = dex_class_def.access_flags_; 1819 // Make sure that none of our runtime-only flags are set. 1820 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1821 klass->SetAccessFlags(access_flags); 1822 klass->SetClassLoader(class_loader); 1823 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1824 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1825 1826 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1827 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1828 1829 // Load fields fields. 1830 const byte* class_data = dex_file.GetClassData(dex_class_def); 1831 if (class_data == NULL) { 1832 return; // no fields or methods - for example a marker interface 1833 } 1834 ClassDataItemIterator it(dex_file, class_data); 1835 Thread* self = Thread::Current(); 1836 if (it.NumStaticFields() != 0) { 1837 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1838 if (UNLIKELY(statics == NULL)) { 1839 CHECK(self->IsExceptionPending()); // OOME. 1840 return; 1841 } 1842 klass->SetSFields(statics); 1843 } 1844 if (it.NumInstanceFields() != 0) { 1845 mirror::ObjectArray<mirror::ArtField>* fields = 1846 AllocArtFieldArray(self, it.NumInstanceFields()); 1847 if (UNLIKELY(fields == NULL)) { 1848 CHECK(self->IsExceptionPending()); // OOME. 1849 return; 1850 } 1851 klass->SetIFields(fields); 1852 } 1853 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1854 SirtRef<mirror::ArtField> sfield(self, AllocArtField(self)); 1855 if (UNLIKELY(sfield.get() == NULL)) { 1856 CHECK(self->IsExceptionPending()); // OOME. 1857 return; 1858 } 1859 klass->SetStaticField(i, sfield.get()); 1860 LoadField(dex_file, it, klass, sfield); 1861 } 1862 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1863 SirtRef<mirror::ArtField> ifield(self, AllocArtField(self)); 1864 if (UNLIKELY(ifield.get() == NULL)) { 1865 CHECK(self->IsExceptionPending()); // OOME. 1866 return; 1867 } 1868 klass->SetInstanceField(i, ifield.get()); 1869 LoadField(dex_file, it, klass, ifield); 1870 } 1871 1872 UniquePtr<const OatFile::OatClass> oat_class; 1873 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1874 oat_class.reset(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1875 } 1876 1877 // Load methods. 1878 if (it.NumDirectMethods() != 0) { 1879 // TODO: append direct methods to class object 1880 mirror::ObjectArray<mirror::ArtMethod>* directs = 1881 AllocArtMethodArray(self, it.NumDirectMethods()); 1882 if (UNLIKELY(directs == NULL)) { 1883 CHECK(self->IsExceptionPending()); // OOME. 1884 return; 1885 } 1886 klass->SetDirectMethods(directs); 1887 } 1888 if (it.NumVirtualMethods() != 0) { 1889 // TODO: append direct methods to class object 1890 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1891 AllocArtMethodArray(self, it.NumVirtualMethods()); 1892 if (UNLIKELY(virtuals == NULL)) { 1893 CHECK(self->IsExceptionPending()); // OOME. 1894 return; 1895 } 1896 klass->SetVirtualMethods(virtuals); 1897 } 1898 size_t class_def_method_index = 0; 1899 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1900 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1901 if (UNLIKELY(method.get() == NULL)) { 1902 CHECK(self->IsExceptionPending()); // OOME. 1903 return; 1904 } 1905 klass->SetDirectMethod(i, method.get()); 1906 if (oat_class.get() != NULL) { 1907 LinkCode(method, oat_class.get(), class_def_method_index); 1908 } 1909 method->SetMethodIndex(class_def_method_index); 1910 class_def_method_index++; 1911 } 1912 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1913 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1914 if (UNLIKELY(method.get() == NULL)) { 1915 CHECK(self->IsExceptionPending()); // OOME. 1916 return; 1917 } 1918 klass->SetVirtualMethod(i, method.get()); 1919 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1920 if (oat_class.get() != NULL) { 1921 LinkCode(method, oat_class.get(), class_def_method_index); 1922 } 1923 class_def_method_index++; 1924 } 1925 DCHECK(!it.HasNext()); 1926} 1927 1928void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1929 const SirtRef<mirror::Class>& klass, 1930 const SirtRef<mirror::ArtField>& dst) { 1931 uint32_t field_idx = it.GetMemberIndex(); 1932 dst->SetDexFieldIndex(field_idx); 1933 dst->SetDeclaringClass(klass.get()); 1934 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1935} 1936 1937mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1938 const ClassDataItemIterator& it, 1939 const SirtRef<mirror::Class>& klass) { 1940 uint32_t dex_method_idx = it.GetMemberIndex(); 1941 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1942 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 1943 1944 mirror::ArtMethod* dst = AllocArtMethod(self); 1945 if (UNLIKELY(dst == NULL)) { 1946 CHECK(self->IsExceptionPending()); // OOME. 1947 return NULL; 1948 } 1949 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 1950 1951 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 1952 dst->SetDexMethodIndex(dex_method_idx); 1953 dst->SetDeclaringClass(klass.get()); 1954 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 1955 1956 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 1957 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 1958 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 1959 1960 uint32_t access_flags = it.GetMemberAccessFlags(); 1961 1962 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 1963 // Set finalizable flag on declaring class. 1964 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 1965 // Void return type. 1966 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 1967 klass->SetFinalizable(); 1968 } else { 1969 ClassHelper kh(klass.get()); 1970 const char* klass_descriptor = kh.GetDescriptor(); 1971 // The Enum class declares a "final" finalize() method to prevent subclasses from 1972 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 1973 // subclasses, so we exclude it here. 1974 // We also want to avoid setting the flag on Object, where we know that finalize() is 1975 // empty. 1976 if ((strcmp("Ljava/lang/Object;", klass_descriptor) != 0) && 1977 (strcmp("Ljava/lang/Enum;", klass_descriptor) != 0)) { 1978 klass->SetFinalizable(); 1979 } 1980 } 1981 } 1982 } else if (method_name[0] == '<') { 1983 // Fix broken access flags for initializers. Bug 11157540. 1984 bool is_init = (strcmp("<init>", method_name) == 0); 1985 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 1986 if (UNLIKELY(!is_init && !is_clinit)) { 1987 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 1988 } else { 1989 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 1990 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 1991 << PrettyDescriptor(klass.get()) << " in dex file " << dex_file.GetLocation(); 1992 access_flags |= kAccConstructor; 1993 } 1994 } 1995 } 1996 dst->SetAccessFlags(access_flags); 1997 1998 self->EndAssertNoThreadSuspension(old_cause); 1999 return dst; 2000} 2001 2002void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2003 Thread* self = Thread::Current(); 2004 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 2005 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2006 AppendToBootClassPath(dex_file, dex_cache); 2007} 2008 2009void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2010 const SirtRef<mirror::DexCache>& dex_cache) { 2011 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 2012 boot_class_path_.push_back(&dex_file); 2013 RegisterDexFile(dex_file, dex_cache); 2014} 2015 2016bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 2017 dex_lock_.AssertSharedHeld(Thread::Current()); 2018 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2019 if (dex_caches_[i]->GetDexFile() == &dex_file) { 2020 return true; 2021 } 2022 } 2023 return false; 2024} 2025 2026bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 2027 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2028 return IsDexFileRegisteredLocked(dex_file); 2029} 2030 2031void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2032 const SirtRef<mirror::DexCache>& dex_cache) { 2033 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2034 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 2035 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2036 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2037 dex_caches_.push_back(dex_cache.get()); 2038 dex_cache->SetDexFile(&dex_file); 2039 dex_caches_dirty_ = true; 2040} 2041 2042void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2043 Thread* self = Thread::Current(); 2044 { 2045 ReaderMutexLock mu(self, dex_lock_); 2046 if (IsDexFileRegisteredLocked(dex_file)) { 2047 return; 2048 } 2049 } 2050 // Don't alloc while holding the lock, since allocation may need to 2051 // suspend all threads and another thread may need the dex_lock_ to 2052 // get to a suspend point. 2053 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 2054 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2055 { 2056 WriterMutexLock mu(self, dex_lock_); 2057 if (IsDexFileRegisteredLocked(dex_file)) { 2058 return; 2059 } 2060 RegisterDexFileLocked(dex_file, dex_cache); 2061 } 2062} 2063 2064void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2065 const SirtRef<mirror::DexCache>& dex_cache) { 2066 WriterMutexLock mu(Thread::Current(), dex_lock_); 2067 RegisterDexFileLocked(dex_file, dex_cache); 2068} 2069 2070mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 2071 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2072 // Search assuming unique-ness of dex file. 2073 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2074 mirror::DexCache* dex_cache = dex_caches_[i]; 2075 if (dex_cache->GetDexFile() == &dex_file) { 2076 return dex_cache; 2077 } 2078 } 2079 // Search matching by location name. 2080 std::string location(dex_file.GetLocation()); 2081 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2082 mirror::DexCache* dex_cache = dex_caches_[i]; 2083 if (dex_cache->GetDexFile()->GetLocation() == location) { 2084 return dex_cache; 2085 } 2086 } 2087 // Failure, dump diagnostic and abort. 2088 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2089 mirror::DexCache* dex_cache = dex_caches_[i]; 2090 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2091 } 2092 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2093 return NULL; 2094} 2095 2096void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 2097 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2098 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2099 dex_caches_[i]->Fixup(resolution_method); 2100 } 2101} 2102 2103mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2104 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2105 if (UNLIKELY(klass == NULL)) { 2106 return NULL; 2107 } 2108 return InitializePrimitiveClass(klass, type); 2109} 2110 2111mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2112 Primitive::Type type) { 2113 CHECK(primitive_class != NULL); 2114 // Must hold lock on object when initializing. 2115 Thread* self = Thread::Current(); 2116 SirtRef<mirror::Class> sirt_class(self, primitive_class); 2117 ObjectLock<mirror::Class> lock(self, &sirt_class); 2118 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2119 primitive_class->SetPrimitiveType(type); 2120 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2121 const char* descriptor = Primitive::Descriptor(type); 2122 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2123 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2124 return primitive_class; 2125} 2126 2127// Create an array class (i.e. the class object for the array, not the 2128// array itself). "descriptor" looks like "[C" or "[[[[B" or 2129// "[Ljava/lang/String;". 2130// 2131// If "descriptor" refers to an array of primitives, look up the 2132// primitive type's internally-generated class object. 2133// 2134// "class_loader" is the class loader of the class that's referring to 2135// us. It's used to ensure that we're looking for the element type in 2136// the right context. It does NOT become the class loader for the 2137// array class; that always comes from the base element class. 2138// 2139// Returns NULL with an exception raised on failure. 2140mirror::Class* ClassLinker::CreateArrayClass(const char* descriptor, 2141 const SirtRef<mirror::ClassLoader>& class_loader) { 2142 // Identify the underlying component type 2143 CHECK_EQ('[', descriptor[0]); 2144 Thread* self = Thread::Current(); 2145 SirtRef<mirror::Class> component_type(self, FindClass(descriptor + 1, class_loader)); 2146 if (component_type.get() == nullptr) { 2147 DCHECK(self->IsExceptionPending()); 2148 return nullptr; 2149 } 2150 2151 // See if the component type is already loaded. Array classes are 2152 // always associated with the class loader of their underlying 2153 // element type -- an array of Strings goes with the loader for 2154 // java/lang/String -- so we need to look for it there. (The 2155 // caller should have checked for the existence of the class 2156 // before calling here, but they did so with *their* class loader, 2157 // not the component type's loader.) 2158 // 2159 // If we find it, the caller adds "loader" to the class' initiating 2160 // loader list, which should prevent us from going through this again. 2161 // 2162 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2163 // are the same, because our caller (FindClass) just did the 2164 // lookup. (Even if we get this wrong we still have correct behavior, 2165 // because we effectively do this lookup again when we add the new 2166 // class to the hash table --- necessary because of possible races with 2167 // other threads.) 2168 if (class_loader.get() != component_type->GetClassLoader()) { 2169 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2170 if (new_class != NULL) { 2171 return new_class; 2172 } 2173 } 2174 2175 // Fill out the fields in the Class. 2176 // 2177 // It is possible to execute some methods against arrays, because 2178 // all arrays are subclasses of java_lang_Object_, so we need to set 2179 // up a vtable. We can just point at the one in java_lang_Object_. 2180 // 2181 // Array classes are simple enough that we don't need to do a full 2182 // link step. 2183 SirtRef<mirror::Class> new_class(self, NULL); 2184 if (UNLIKELY(!init_done_)) { 2185 // Classes that were hand created, ie not by FindSystemClass 2186 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2187 new_class.reset(GetClassRoot(kClassArrayClass)); 2188 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2189 new_class.reset(GetClassRoot(kObjectArrayClass)); 2190 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2191 new_class.reset(GetClassRoot(kJavaLangStringArrayClass)); 2192 } else if (strcmp(descriptor, 2193 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2194 new_class.reset(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2195 } else if (strcmp(descriptor, 2196 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2197 new_class.reset(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2198 } else if (strcmp(descriptor, "[C") == 0) { 2199 new_class.reset(GetClassRoot(kCharArrayClass)); 2200 } else if (strcmp(descriptor, "[I") == 0) { 2201 new_class.reset(GetClassRoot(kIntArrayClass)); 2202 } 2203 } 2204 if (new_class.get() == nullptr) { 2205 new_class.reset(AllocClass(self, sizeof(mirror::Class))); 2206 if (new_class.get() == nullptr) { 2207 return nullptr; 2208 } 2209 new_class->SetComponentType(component_type.get()); 2210 } 2211 ObjectLock<mirror::Class> lock(self, &new_class); // Must hold lock on object when initializing. 2212 DCHECK(new_class->GetComponentType() != NULL); 2213 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2214 new_class->SetSuperClass(java_lang_Object); 2215 new_class->SetVTable(java_lang_Object->GetVTable()); 2216 new_class->SetPrimitiveType(Primitive::kPrimNot); 2217 new_class->SetClassLoader(component_type->GetClassLoader()); 2218 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2219 // don't need to set new_class->SetObjectSize(..) 2220 // because Object::SizeOf delegates to Array::SizeOf 2221 2222 2223 // All arrays have java/lang/Cloneable and java/io/Serializable as 2224 // interfaces. We need to set that up here, so that stuff like 2225 // "instanceof" works right. 2226 // 2227 // Note: The GC could run during the call to FindSystemClass, 2228 // so we need to make sure the class object is GC-valid while we're in 2229 // there. Do this by clearing the interface list so the GC will just 2230 // think that the entries are null. 2231 2232 2233 // Use the single, global copies of "interfaces" and "iftable" 2234 // (remember not to free them for arrays). 2235 CHECK(array_iftable_ != nullptr); 2236 new_class->SetIfTable(array_iftable_); 2237 2238 // Inherit access flags from the component type. 2239 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2240 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2241 access_flags &= kAccJavaFlagsMask; 2242 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2243 // and remove "interface". 2244 access_flags |= kAccAbstract | kAccFinal; 2245 access_flags &= ~kAccInterface; 2246 2247 new_class->SetAccessFlags(access_flags); 2248 2249 mirror::Class* existing = InsertClass(descriptor, new_class.get(), Hash(descriptor)); 2250 if (existing == nullptr) { 2251 return new_class.get(); 2252 } 2253 // Another thread must have loaded the class after we 2254 // started but before we finished. Abandon what we've 2255 // done. 2256 // 2257 // (Yes, this happens.) 2258 2259 return existing; 2260} 2261 2262mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2263 switch (Primitive::GetType(type)) { 2264 case Primitive::kPrimByte: 2265 return GetClassRoot(kPrimitiveByte); 2266 case Primitive::kPrimChar: 2267 return GetClassRoot(kPrimitiveChar); 2268 case Primitive::kPrimDouble: 2269 return GetClassRoot(kPrimitiveDouble); 2270 case Primitive::kPrimFloat: 2271 return GetClassRoot(kPrimitiveFloat); 2272 case Primitive::kPrimInt: 2273 return GetClassRoot(kPrimitiveInt); 2274 case Primitive::kPrimLong: 2275 return GetClassRoot(kPrimitiveLong); 2276 case Primitive::kPrimShort: 2277 return GetClassRoot(kPrimitiveShort); 2278 case Primitive::kPrimBoolean: 2279 return GetClassRoot(kPrimitiveBoolean); 2280 case Primitive::kPrimVoid: 2281 return GetClassRoot(kPrimitiveVoid); 2282 case Primitive::kPrimNot: 2283 break; 2284 } 2285 std::string printable_type(PrintableChar(type)); 2286 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2287 return NULL; 2288} 2289 2290mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2291 size_t hash) { 2292 if (VLOG_IS_ON(class_linker)) { 2293 mirror::DexCache* dex_cache = klass->GetDexCache(); 2294 std::string source; 2295 if (dex_cache != NULL) { 2296 source += " from "; 2297 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2298 } 2299 LOG(INFO) << "Loaded class " << descriptor << source; 2300 } 2301 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2302 mirror::Class* existing = 2303 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2304 if (existing != NULL) { 2305 return existing; 2306 } 2307 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2308 // Check a class loaded with the system class loader matches one in the image if the class 2309 // is in the image. 2310 existing = LookupClassFromImage(descriptor); 2311 if (existing != NULL) { 2312 CHECK(klass == existing); 2313 } 2314 } 2315 Runtime::Current()->GetHeap()->VerifyObject(klass); 2316 class_table_.insert(std::make_pair(hash, klass)); 2317 class_table_dirty_ = true; 2318 return NULL; 2319} 2320 2321bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2322 size_t hash = Hash(descriptor); 2323 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2324 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2325 ++it) { 2326 mirror::Class* klass = it->second; 2327 ClassHelper kh(klass); 2328 if ((klass->GetClassLoader() == class_loader) && 2329 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2330 class_table_.erase(it); 2331 return true; 2332 } 2333 } 2334 return false; 2335} 2336 2337mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2338 const mirror::ClassLoader* class_loader) { 2339 size_t hash = Hash(descriptor); 2340 { 2341 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2342 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2343 if (result != NULL) { 2344 return result; 2345 } 2346 } 2347 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2348 return NULL; 2349 } else { 2350 // Lookup failed but need to search dex_caches_. 2351 mirror::Class* result = LookupClassFromImage(descriptor); 2352 if (result != NULL) { 2353 InsertClass(descriptor, result, hash); 2354 } else { 2355 // Searching the image dex files/caches failed, we don't want to get into this situation 2356 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2357 // classes into the class table. 2358 const int32_t kMaxFailedDexCacheLookups = 1000; 2359 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2360 MoveImageClassesToClassTable(); 2361 } 2362 } 2363 return result; 2364 } 2365} 2366 2367mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2368 const mirror::ClassLoader* class_loader, 2369 size_t hash) { 2370 auto end = class_table_.end(); 2371 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2372 mirror::Class* klass = it->second; 2373 ClassHelper kh(klass); 2374 if ((klass->GetClassLoader() == class_loader) && 2375 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2376 if (kIsDebugBuild) { 2377 // Check for duplicates in the table. 2378 for (++it; it != end && it->first == hash; ++it) { 2379 mirror::Class* klass2 = it->second; 2380 ClassHelper kh(klass2); 2381 CHECK(!((klass2->GetClassLoader() == class_loader) && 2382 (strcmp(descriptor, kh.GetDescriptor()) == 0))) 2383 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2384 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2385 } 2386 } 2387 return klass; 2388 } 2389 } 2390 return NULL; 2391} 2392 2393static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2394 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2395 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2396 CHECK(image != NULL); 2397 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2398 return root->AsObjectArray<mirror::DexCache>(); 2399} 2400 2401void ClassLinker::MoveImageClassesToClassTable() { 2402 Thread* self = Thread::Current(); 2403 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2404 if (!dex_cache_image_class_lookup_required_) { 2405 return; // All dex cache classes are already in the class table. 2406 } 2407 const char* old_no_suspend_cause = 2408 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2409 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2410 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2411 mirror::DexCache* dex_cache = dex_caches->Get(i); 2412 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2413 for (int32_t j = 0; j < types->GetLength(); j++) { 2414 mirror::Class* klass = types->Get(j); 2415 if (klass != NULL) { 2416 ClassHelper kh(klass); 2417 DCHECK(klass->GetClassLoader() == NULL); 2418 const char* descriptor = kh.GetDescriptor(); 2419 size_t hash = Hash(descriptor); 2420 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 2421 if (existing != NULL) { 2422 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2423 << PrettyClassAndClassLoader(klass); 2424 } else { 2425 class_table_.insert(std::make_pair(hash, klass)); 2426 } 2427 } 2428 } 2429 } 2430 class_table_dirty_ = true; 2431 dex_cache_image_class_lookup_required_ = false; 2432 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2433} 2434 2435mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2436 Thread* self = Thread::Current(); 2437 const char* old_no_suspend_cause = 2438 self->StartAssertNoThreadSuspension("Image class lookup"); 2439 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2440 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2441 mirror::DexCache* dex_cache = dex_caches->Get(i); 2442 const DexFile* dex_file = dex_cache->GetDexFile(); 2443 // Try binary searching the string/type index. 2444 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2445 if (string_id != NULL) { 2446 const DexFile::TypeId* type_id = 2447 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2448 if (type_id != NULL) { 2449 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2450 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2451 if (klass != NULL) { 2452 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2453 return klass; 2454 } 2455 } 2456 } 2457 } 2458 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2459 return NULL; 2460} 2461 2462void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2463 result.clear(); 2464 if (dex_cache_image_class_lookup_required_) { 2465 MoveImageClassesToClassTable(); 2466 } 2467 size_t hash = Hash(descriptor); 2468 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2469 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2470 it != end && it->first == hash; ++it) { 2471 mirror::Class* klass = it->second; 2472 ClassHelper kh(klass); 2473 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2474 result.push_back(klass); 2475 } 2476 } 2477} 2478 2479void ClassLinker::VerifyClass(const SirtRef<mirror::Class>& klass) { 2480 // TODO: assert that the monitor on the Class is held 2481 Thread* self = Thread::Current(); 2482 ObjectLock<mirror::Class> lock(self, &klass); 2483 2484 // Don't attempt to re-verify if already sufficiently verified. 2485 if (klass->IsVerified() || 2486 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2487 return; 2488 } 2489 2490 // The class might already be erroneous, for example at compile time if we attempted to verify 2491 // this class as a parent to another. 2492 if (klass->IsErroneous()) { 2493 ThrowEarlierClassFailure(klass.get()); 2494 return; 2495 } 2496 2497 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2498 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2499 } else { 2500 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2501 << PrettyClass(klass.get()); 2502 CHECK(!Runtime::Current()->IsCompiler()); 2503 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2504 } 2505 2506 // Verify super class. 2507 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 2508 if (super.get() != NULL) { 2509 // Acquire lock to prevent races on verifying the super class. 2510 ObjectLock<mirror::Class> lock(self, &super); 2511 2512 if (!super->IsVerified() && !super->IsErroneous()) { 2513 VerifyClass(super); 2514 } 2515 if (!super->IsCompileTimeVerified()) { 2516 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2517 PrettyDescriptor(klass.get()).c_str(), 2518 PrettyDescriptor(super.get()).c_str())); 2519 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2520 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 2521 if (cause.get() != nullptr) { 2522 self->ClearException(); 2523 } 2524 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2525 if (cause.get() != nullptr) { 2526 self->GetException(nullptr)->SetCause(cause.get()); 2527 } 2528 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2529 if (Runtime::Current()->IsCompiler()) { 2530 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2531 } 2532 klass->SetStatus(mirror::Class::kStatusError, self); 2533 return; 2534 } 2535 } 2536 2537 // Try to use verification information from the oat file, otherwise do runtime verification. 2538 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2539 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2540 bool preverified = VerifyClassUsingOatFile(dex_file, klass.get(), oat_file_class_status); 2541 if (oat_file_class_status == mirror::Class::kStatusError) { 2542 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2543 << PrettyDescriptor(klass.get()) << " in " 2544 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2545 ThrowVerifyError(klass.get(), "Rejecting class %s because it failed compile-time verification", 2546 PrettyDescriptor(klass.get()).c_str()); 2547 klass->SetStatus(mirror::Class::kStatusError, self); 2548 return; 2549 } 2550 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2551 std::string error_msg; 2552 if (!preverified) { 2553 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.get(), 2554 Runtime::Current()->IsCompiler(), 2555 &error_msg); 2556 } 2557 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2558 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2559 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.get()) 2560 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2561 << " because: " << error_msg; 2562 } 2563 self->AssertNoPendingException(); 2564 // Make sure all classes referenced by catch blocks are resolved. 2565 ResolveClassExceptionHandlerTypes(dex_file, klass); 2566 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2567 // Even though there were no verifier failures we need to respect whether the super-class 2568 // was verified or requiring runtime reverification. 2569 if (super.get() == NULL || super->IsVerified()) { 2570 klass->SetStatus(mirror::Class::kStatusVerified, self); 2571 } else { 2572 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2573 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2574 // Pretend a soft failure occured so that we don't consider the class verified below. 2575 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2576 } 2577 } else { 2578 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2579 // Soft failures at compile time should be retried at runtime. Soft 2580 // failures at runtime will be handled by slow paths in the generated 2581 // code. Set status accordingly. 2582 if (Runtime::Current()->IsCompiler()) { 2583 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2584 } else { 2585 klass->SetStatus(mirror::Class::kStatusVerified, self); 2586 } 2587 } 2588 } else { 2589 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.get()) 2590 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2591 << " because: " << error_msg; 2592 self->AssertNoPendingException(); 2593 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2594 klass->SetStatus(mirror::Class::kStatusError, self); 2595 } 2596 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2597 // Class is verified so we don't need to do any access check on its methods. 2598 // Let the interpreter know it by setting the kAccPreverified flag onto each 2599 // method. 2600 // Note: we're going here during compilation and at runtime. When we set the 2601 // kAccPreverified flag when compiling image classes, the flag is recorded 2602 // in the image and is set when loading the image. 2603 klass->SetPreverifiedFlagOnAllMethods(); 2604 } 2605} 2606 2607bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2608 mirror::Class::Status& oat_file_class_status) { 2609 // If we're compiling, we can only verify the class using the oat file if 2610 // we are not compiling the image or if the class we're verifying is not part of 2611 // the app. In other words, we will only check for preverification of bootclasspath 2612 // classes. 2613 if (Runtime::Current()->IsCompiler()) { 2614 // Are we compiling the bootclasspath? 2615 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2616 return false; 2617 } 2618 // We are compiling an app (not the image). 2619 2620 // Is this an app class? (I.e. not a bootclasspath class) 2621 if (klass->GetClassLoader() != NULL) { 2622 return false; 2623 } 2624 } 2625 2626 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2627 // Make this work with gtests, which do not set up the image properly. 2628 // TODO: we should clean up gtests to set up the image path properly. 2629 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2630 return false; 2631 } 2632 2633 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2634 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2635 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2636 &dex_location_checksum); 2637 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2638 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2639 UniquePtr<const OatFile::OatClass> oat_class(oat_dex_file->GetOatClass(class_def_index)); 2640 CHECK(oat_class.get() != NULL) 2641 << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2642 << ClassHelper(klass).GetDescriptor(); 2643 oat_file_class_status = oat_class->GetStatus(); 2644 if (oat_file_class_status == mirror::Class::kStatusVerified || 2645 oat_file_class_status == mirror::Class::kStatusInitialized) { 2646 return true; 2647 } 2648 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2649 // Compile time verification failed with a soft error. Compile time verification can fail 2650 // because we have incomplete type information. Consider the following: 2651 // class ... { 2652 // Foo x; 2653 // .... () { 2654 // if (...) { 2655 // v1 gets assigned a type of resolved class Foo 2656 // } else { 2657 // v1 gets assigned a type of unresolved class Bar 2658 // } 2659 // iput x = v1 2660 // } } 2661 // when we merge v1 following the if-the-else it results in Conflict 2662 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2663 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2664 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2665 // at compile time). 2666 return false; 2667 } 2668 if (oat_file_class_status == mirror::Class::kStatusError) { 2669 // Compile time verification failed with a hard error. This is caused by invalid instructions 2670 // in the class. These errors are unrecoverable. 2671 return false; 2672 } 2673 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2674 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2675 // not loading the class. 2676 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2677 // isn't a problem and this case shouldn't occur 2678 return false; 2679 } 2680 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2681 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2682 << ClassHelper(klass).GetDescriptor(); 2683 2684 return false; 2685} 2686 2687void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2688 const SirtRef<mirror::Class>& klass) { 2689 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2690 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2691 } 2692 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2693 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2694 } 2695} 2696 2697void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2698 mirror::ArtMethod* method) { 2699 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2700 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2701 if (code_item == NULL) { 2702 return; // native or abstract method 2703 } 2704 if (code_item->tries_size_ == 0) { 2705 return; // nothing to process 2706 } 2707 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2708 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2709 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2710 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2711 CatchHandlerIterator iterator(handlers_ptr); 2712 for (; iterator.HasNext(); iterator.Next()) { 2713 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2714 // unresolved exception types will be ignored by exception delivery 2715 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2716 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2717 if (exception_type == NULL) { 2718 DCHECK(Thread::Current()->IsExceptionPending()); 2719 Thread::Current()->ClearException(); 2720 } 2721 } 2722 } 2723 handlers_ptr = iterator.EndDataPointer(); 2724 } 2725} 2726 2727static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2728static void CheckProxyMethod(mirror::ArtMethod* method, 2729 SirtRef<mirror::ArtMethod>& prototype); 2730 2731mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccess& soa, jstring name, 2732 jobjectArray interfaces, jobject loader, 2733 jobjectArray methods, jobjectArray throws) { 2734 Thread* self = soa.Self(); 2735 SirtRef<mirror::Class> klass(self, AllocClass(self, GetClassRoot(kJavaLangClass), 2736 sizeof(mirror::SynthesizedProxyClass))); 2737 if (klass.get() == NULL) { 2738 CHECK(self->IsExceptionPending()); // OOME. 2739 return NULL; 2740 } 2741 DCHECK(klass->GetClass() != NULL); 2742 klass->SetObjectSize(sizeof(mirror::Proxy)); 2743 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2744 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2745 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2746 klass->SetName(soa.Decode<mirror::String*>(name)); 2747 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2748 klass->SetDexCache(proxy_class->GetDexCache()); 2749 klass->SetStatus(mirror::Class::kStatusIdx, self); 2750 2751 // Instance fields are inherited, but we add a couple of static fields... 2752 { 2753 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2754 if (UNLIKELY(sfields == NULL)) { 2755 CHECK(self->IsExceptionPending()); // OOME. 2756 return NULL; 2757 } 2758 klass->SetSFields(sfields); 2759 } 2760 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2761 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2762 SirtRef<mirror::ArtField> interfaces_sfield(self, AllocArtField(self)); 2763 if (UNLIKELY(interfaces_sfield.get() == NULL)) { 2764 CHECK(self->IsExceptionPending()); // OOME. 2765 return NULL; 2766 } 2767 klass->SetStaticField(0, interfaces_sfield.get()); 2768 interfaces_sfield->SetDexFieldIndex(0); 2769 interfaces_sfield->SetDeclaringClass(klass.get()); 2770 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2771 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2772 SirtRef<mirror::ArtField> throws_sfield(self, AllocArtField(self)); 2773 if (UNLIKELY(throws_sfield.get() == NULL)) { 2774 CHECK(self->IsExceptionPending()); // OOME. 2775 return NULL; 2776 } 2777 klass->SetStaticField(1, throws_sfield.get()); 2778 throws_sfield->SetDexFieldIndex(1); 2779 throws_sfield->SetDeclaringClass(klass.get()); 2780 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2781 2782 // Proxies have 1 direct method, the constructor 2783 { 2784 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 2785 if (UNLIKELY(directs == NULL)) { 2786 CHECK(self->IsExceptionPending()); // OOME. 2787 return NULL; 2788 } 2789 klass->SetDirectMethods(directs); 2790 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2791 if (UNLIKELY(constructor == NULL)) { 2792 CHECK(self->IsExceptionPending()); // OOME. 2793 return NULL; 2794 } 2795 klass->SetDirectMethod(0, constructor); 2796 } 2797 2798 // Create virtual method using specified prototypes. 2799 size_t num_virtual_methods = 2800 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 2801 { 2802 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, num_virtual_methods); 2803 if (UNLIKELY(virtuals == NULL)) { 2804 CHECK(self->IsExceptionPending()); // OOME. 2805 return NULL; 2806 } 2807 klass->SetVirtualMethods(virtuals); 2808 } 2809 for (size_t i = 0; i < num_virtual_methods; ++i) { 2810 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2811 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2812 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2813 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2814 if (UNLIKELY(clone == NULL)) { 2815 CHECK(self->IsExceptionPending()); // OOME. 2816 return NULL; 2817 } 2818 klass->SetVirtualMethod(i, clone); 2819 } 2820 2821 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2822 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Class is now effectively in the loaded state 2823 self->AssertNoPendingException(); 2824 2825 { 2826 ObjectLock<mirror::Class> lock(self, &klass); // Must hold lock on object when resolved. 2827 // Link the fields and virtual methods, creating vtable and iftables 2828 SirtRef<mirror::ObjectArray<mirror::Class> > sirt_interfaces( 2829 self, soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2830 if (!LinkClass(self, klass, sirt_interfaces)) { 2831 klass->SetStatus(mirror::Class::kStatusError, self); 2832 return nullptr; 2833 } 2834 2835 interfaces_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2836 throws_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2837 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2838 } 2839 2840 // sanity checks 2841 if (kIsDebugBuild) { 2842 CHECK(klass->GetIFields() == NULL); 2843 CheckProxyConstructor(klass->GetDirectMethod(0)); 2844 for (size_t i = 0; i < num_virtual_methods; ++i) { 2845 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2846 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2847 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2848 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2849 } 2850 2851 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 2852 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2853 decoded_name->ToModifiedUtf8().c_str())); 2854 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2855 2856 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2857 decoded_name->ToModifiedUtf8().c_str())); 2858 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2859 2860 mirror::SynthesizedProxyClass* synth_proxy_class = 2861 down_cast<mirror::SynthesizedProxyClass*>(klass.get()); 2862 CHECK_EQ(synth_proxy_class->GetInterfaces(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2863 CHECK_EQ(synth_proxy_class->GetThrows(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2864 } 2865 std::string descriptor(GetDescriptorForProxy(klass.get())); 2866 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.get(), Hash(descriptor.c_str())); 2867 CHECK(existing == nullptr); 2868 return klass.get(); 2869} 2870 2871std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 2872 DCHECK(proxy_class->IsProxyClass()); 2873 mirror::String* name = proxy_class->GetName(); 2874 DCHECK(name != NULL); 2875 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2876} 2877 2878mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 2879 mirror::ArtMethod* proxy_method) { 2880 DCHECK(proxy_class->IsProxyClass()); 2881 DCHECK(proxy_method->IsProxyMethod()); 2882 // Locate the dex cache of the original interface/Object 2883 mirror::DexCache* dex_cache = NULL; 2884 { 2885 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2886 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2887 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2888 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2889 dex_cache = dex_caches_[i]; 2890 break; 2891 } 2892 } 2893 } 2894 CHECK(dex_cache != NULL); 2895 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2896 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2897 CHECK(resolved_method != NULL); 2898 return resolved_method; 2899} 2900 2901 2902mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2903 const SirtRef<mirror::Class>& klass, 2904 mirror::Class* proxy_class) { 2905 // Create constructor for Proxy that must initialize h 2906 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2907 proxy_class->GetDirectMethods(); 2908 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2909 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2910 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2911 // code_ too) 2912 mirror::ArtMethod* constructor = 2913 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2914 if (constructor == NULL) { 2915 CHECK(self->IsExceptionPending()); // OOME. 2916 return NULL; 2917 } 2918 // Make this constructor public and fix the class to be our Proxy version 2919 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2920 constructor->SetDeclaringClass(klass.get()); 2921 return constructor; 2922} 2923 2924static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2925 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2926 CHECK(constructor->IsConstructor()); 2927 MethodHelper mh(constructor); 2928 CHECK_STREQ(mh.GetName(), "<init>"); 2929 CHECK_STREQ(mh.GetSignature().ToString().c_str(), "(Ljava/lang/reflect/InvocationHandler;)V"); 2930 DCHECK(constructor->IsPublic()); 2931} 2932 2933mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 2934 const SirtRef<mirror::Class>& klass, 2935 const SirtRef<mirror::ArtMethod>& prototype) { 2936 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2937 // prototype method 2938 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2939 prototype.get()); 2940 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2941 // as necessary 2942 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 2943 if (UNLIKELY(method == NULL)) { 2944 CHECK(self->IsExceptionPending()); // OOME. 2945 return NULL; 2946 } 2947 2948 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 2949 // the intersection of throw exceptions as defined in Proxy 2950 method->SetDeclaringClass(klass.get()); 2951 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 2952 2953 // At runtime the method looks like a reference and argument saving method, clone the code 2954 // related parameters from this method. 2955 mirror::ArtMethod* refs_and_args = 2956 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 2957 method->SetCoreSpillMask(refs_and_args->GetCoreSpillMask()); 2958 method->SetFpSpillMask(refs_and_args->GetFpSpillMask()); 2959 method->SetFrameSizeInBytes(refs_and_args->GetFrameSizeInBytes()); 2960 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 2961 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 2962 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2963 2964 return method; 2965} 2966 2967static void CheckProxyMethod(mirror::ArtMethod* method, 2968 SirtRef<mirror::ArtMethod>& prototype) 2969 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2970 // Basic sanity 2971 CHECK(!prototype->IsFinal()); 2972 CHECK(method->IsFinal()); 2973 CHECK(!method->IsAbstract()); 2974 2975 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 2976 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 2977 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 2978 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 2979 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 2980 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 2981 2982 MethodHelper mh(method); 2983 MethodHelper mh2(prototype.get()); 2984 CHECK_STREQ(mh.GetName(), mh2.GetName()); 2985 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 2986 // More complex sanity - via dex cache 2987 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 2988} 2989 2990static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 2991 bool can_init_parents) 2992 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2993 if (can_init_statics && can_init_parents) { 2994 return true; 2995 } 2996 if (!can_init_statics) { 2997 // Check if there's a class initializer. 2998 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 2999 if (clinit != NULL) { 3000 return false; 3001 } 3002 // Check if there are encoded static values needing initialization. 3003 if (klass->NumStaticFields() != 0) { 3004 ClassHelper kh(klass); 3005 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3006 DCHECK(dex_class_def != NULL); 3007 if (dex_class_def->static_values_off_ != 0) { 3008 return false; 3009 } 3010 } 3011 } 3012 if (!klass->IsInterface() && klass->HasSuperClass()) { 3013 mirror::Class* super_class = klass->GetSuperClass(); 3014 if (!can_init_parents && !super_class->IsInitialized()) { 3015 return false; 3016 } else { 3017 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3018 return false; 3019 } 3020 } 3021 } 3022 return true; 3023} 3024 3025bool ClassLinker::IsInitialized() const { 3026 return init_done_; 3027} 3028 3029bool ClassLinker::InitializeClass(const SirtRef<mirror::Class>& klass, bool can_init_statics, 3030 bool can_init_parents) { 3031 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3032 3033 // Are we already initialized and therefore done? 3034 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3035 // an initialized class will never change its state. 3036 if (klass->IsInitialized()) { 3037 return true; 3038 } 3039 3040 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3041 if (!CanWeInitializeClass(klass.get(), can_init_statics, can_init_parents)) { 3042 return false; 3043 } 3044 3045 Thread* self = Thread::Current(); 3046 uint64_t t0; 3047 { 3048 ObjectLock<mirror::Class> lock(self, &klass); 3049 3050 // Re-check under the lock in case another thread initialized ahead of us. 3051 if (klass->IsInitialized()) { 3052 return true; 3053 } 3054 3055 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3056 if (klass->IsErroneous()) { 3057 ThrowEarlierClassFailure(klass.get()); 3058 return false; 3059 } 3060 3061 CHECK(klass->IsResolved()) << PrettyClass(klass.get()) << ": state=" << klass->GetStatus(); 3062 3063 if (!klass->IsVerified()) { 3064 VerifyClass(klass); 3065 if (!klass->IsVerified()) { 3066 // We failed to verify, expect either the klass to be erroneous or verification failed at 3067 // compile time. 3068 if (klass->IsErroneous()) { 3069 CHECK(self->IsExceptionPending()); 3070 } else { 3071 CHECK(Runtime::Current()->IsCompiler()); 3072 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3073 } 3074 return false; 3075 } 3076 } 3077 3078 // If the class is kStatusInitializing, either this thread is 3079 // initializing higher up the stack or another thread has beat us 3080 // to initializing and we need to wait. Either way, this 3081 // invocation of InitializeClass will not be responsible for 3082 // running <clinit> and will return. 3083 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3084 // We caught somebody else in the act; was it us? 3085 if (klass->GetClinitThreadId() == self->GetTid()) { 3086 // Yes. That's fine. Return so we can continue initializing. 3087 return true; 3088 } 3089 // No. That's fine. Wait for another thread to finish initializing. 3090 return WaitForInitializeClass(klass, self, lock); 3091 } 3092 3093 if (!ValidateSuperClassDescriptors(klass)) { 3094 klass->SetStatus(mirror::Class::kStatusError, self); 3095 return false; 3096 } 3097 3098 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.get()); 3099 3100 // From here out other threads may observe that we're initializing and so changes of state 3101 // require the a notification. 3102 klass->SetClinitThreadId(self->GetTid()); 3103 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3104 3105 t0 = NanoTime(); 3106 } 3107 3108 // Initialize super classes, must be done while initializing for the JLS. 3109 if (!klass->IsInterface() && klass->HasSuperClass()) { 3110 mirror::Class* super_class = klass->GetSuperClass(); 3111 if (!super_class->IsInitialized()) { 3112 CHECK(!super_class->IsInterface()); 3113 CHECK(can_init_parents); 3114 SirtRef<mirror::Class> sirt_super(self, super_class); 3115 bool super_initialized = InitializeClass(sirt_super, can_init_statics, true); 3116 if (!super_initialized) { 3117 // The super class was verified ahead of entering initializing, we should only be here if 3118 // the super class became erroneous due to initialization. 3119 CHECK(sirt_super->IsErroneous() && self->IsExceptionPending()) 3120 << "Super class initialization failed for " << PrettyDescriptor(sirt_super.get()) 3121 << " that has unexpected status " << sirt_super->GetStatus() 3122 << "\nPending exception:\n" 3123 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3124 ObjectLock<mirror::Class> lock(self, &klass); 3125 // Initialization failed because the super-class is erroneous. 3126 klass->SetStatus(mirror::Class::kStatusError, self); 3127 return false; 3128 } 3129 } 3130 } 3131 3132 if (klass->NumStaticFields() > 0) { 3133 ClassHelper kh(klass.get()); 3134 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3135 CHECK(dex_class_def != NULL); 3136 const DexFile& dex_file = kh.GetDexFile(); 3137 SirtRef<mirror::ClassLoader> class_loader(self, klass->GetClassLoader()); 3138 SirtRef<mirror::DexCache> dex_cache(self, kh.GetDexCache()); 3139 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3140 this, *dex_class_def); 3141 if (it.HasNext()) { 3142 CHECK(can_init_statics); 3143 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 3144 SafeMap<uint32_t, mirror::ArtField*> field_map; 3145 ConstructFieldMap(dex_file, *dex_class_def, klass.get(), field_map); 3146 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3147 if (Runtime::Current()->IsActiveTransaction()) { 3148 it.ReadValueToField<true>(field_map.Get(i)); 3149 } else { 3150 it.ReadValueToField<false>(field_map.Get(i)); 3151 } 3152 } 3153 } 3154 } 3155 3156 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3157 if (clinit != NULL) { 3158 CHECK(can_init_statics); 3159 if (LIKELY(Runtime::Current()->IsStarted())) { 3160 JValue result; 3161 clinit->Invoke(self, NULL, 0, &result, "V"); 3162 } else { 3163 art::interpreter::EnterInterpreterFromInvoke(self, clinit, NULL, NULL, NULL); 3164 } 3165 } 3166 3167 // Opportunistically set static method trampolines to their destination. 3168 FixupStaticTrampolines(klass.get()); 3169 3170 uint64_t t1 = NanoTime(); 3171 3172 bool success = true; 3173 { 3174 ObjectLock<mirror::Class> lock(self, &klass); 3175 3176 if (self->IsExceptionPending()) { 3177 WrapExceptionInInitializer(); 3178 klass->SetStatus(mirror::Class::kStatusError, self); 3179 success = false; 3180 } else { 3181 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3182 RuntimeStats* thread_stats = self->GetStats(); 3183 ++global_stats->class_init_count; 3184 ++thread_stats->class_init_count; 3185 global_stats->class_init_time_ns += (t1 - t0); 3186 thread_stats->class_init_time_ns += (t1 - t0); 3187 // Set the class as initialized except if failed to initialize static fields. 3188 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3189 if (VLOG_IS_ON(class_linker)) { 3190 ClassHelper kh(klass.get()); 3191 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 3192 } 3193 } 3194 } 3195 return success; 3196} 3197 3198bool ClassLinker::WaitForInitializeClass(const SirtRef<mirror::Class>& klass, Thread* self, 3199 ObjectLock<mirror::Class>& lock) 3200 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3201 while (true) { 3202 self->AssertNoPendingException(); 3203 CHECK(!klass->IsInitialized()); 3204 lock.WaitIgnoringInterrupts(); 3205 3206 // When we wake up, repeat the test for init-in-progress. If 3207 // there's an exception pending (only possible if 3208 // "interruptShouldThrow" was set), bail out. 3209 if (self->IsExceptionPending()) { 3210 WrapExceptionInInitializer(); 3211 klass->SetStatus(mirror::Class::kStatusError, self); 3212 return false; 3213 } 3214 // Spurious wakeup? Go back to waiting. 3215 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3216 continue; 3217 } 3218 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3219 // Compile time initialization failed. 3220 return false; 3221 } 3222 if (klass->IsErroneous()) { 3223 // The caller wants an exception, but it was thrown in a 3224 // different thread. Synthesize one here. 3225 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3226 PrettyDescriptor(klass.get()).c_str()); 3227 return false; 3228 } 3229 if (klass->IsInitialized()) { 3230 return true; 3231 } 3232 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.get()) << " is " 3233 << klass->GetStatus(); 3234 } 3235 LOG(FATAL) << "Not Reached" << PrettyClass(klass.get()); 3236} 3237 3238bool ClassLinker::ValidateSuperClassDescriptors(const SirtRef<mirror::Class>& klass) { 3239 if (klass->IsInterface()) { 3240 return true; 3241 } 3242 Thread* self = Thread::Current(); 3243 // begin with the methods local to the superclass 3244 if (klass->HasSuperClass() && 3245 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3246 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 3247 for (int i = super->GetVTable()->GetLength() - 1; i >= 0; --i) { 3248 mirror::ArtMethod* method = klass->GetVTable()->Get(i); 3249 if (method != super->GetVTable()->Get(i) && 3250 !IsSameMethodSignatureInDifferentClassContexts(method, super.get(), klass.get())) { 3251 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in superclass %s", 3252 PrettyDescriptor(klass.get()).c_str(), PrettyMethod(method).c_str(), 3253 PrettyDescriptor(super.get()).c_str()); 3254 return false; 3255 } 3256 } 3257 } 3258 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3259 SirtRef<mirror::Class> interface(self, klass->GetIfTable()->GetInterface(i)); 3260 if (klass->GetClassLoader() != interface->GetClassLoader()) { 3261 for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { 3262 mirror::ArtMethod* method = klass->GetIfTable()->GetMethodArray(i)->Get(j); 3263 if (!IsSameMethodSignatureInDifferentClassContexts(method, interface.get(), 3264 method->GetDeclaringClass())) { 3265 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in interface %s", 3266 PrettyDescriptor(method->GetDeclaringClass()).c_str(), 3267 PrettyMethod(method).c_str(), 3268 PrettyDescriptor(interface.get()).c_str()); 3269 return false; 3270 } 3271 } 3272 } 3273 } 3274 return true; 3275} 3276 3277// Returns true if classes referenced by the signature of the method are the 3278// same classes in klass1 as they are in klass2. 3279bool ClassLinker::IsSameMethodSignatureInDifferentClassContexts(mirror::ArtMethod* method, 3280 mirror::Class* klass1, 3281 mirror::Class* klass2) { 3282 if (klass1 == klass2) { 3283 return true; 3284 } 3285 Thread* self = Thread::Current(); 3286 CHECK(klass1 != nullptr); 3287 CHECK(klass2 != nullptr); 3288 SirtRef<mirror::ClassLoader> loader1(self, klass1->GetClassLoader()); 3289 SirtRef<mirror::ClassLoader> loader2(self, klass2->GetClassLoader()); 3290 const DexFile& dex_file = *method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 3291 const DexFile::ProtoId& proto_id = 3292 dex_file.GetMethodPrototype(dex_file.GetMethodId(method->GetDexMethodIndex())); 3293 for (DexFileParameterIterator it(dex_file, proto_id); it.HasNext(); it.Next()) { 3294 const char* descriptor = it.GetDescriptor(); 3295 if (descriptor == nullptr) { 3296 break; 3297 } 3298 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3299 // Found a non-primitive type. 3300 if (!IsSameDescriptorInDifferentClassContexts(descriptor, loader1, loader2)) { 3301 return false; 3302 } 3303 } 3304 } 3305 // Check the return type 3306 const char* descriptor = dex_file.GetReturnTypeDescriptor(proto_id); 3307 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3308 if (!IsSameDescriptorInDifferentClassContexts(descriptor, loader1, loader2)) { 3309 return false; 3310 } 3311 } 3312 return true; 3313} 3314 3315// Returns true if the descriptor resolves to the same class in the context of loader1 and loader2. 3316bool ClassLinker::IsSameDescriptorInDifferentClassContexts(const char* descriptor, 3317 SirtRef<mirror::ClassLoader>& loader1, 3318 SirtRef<mirror::ClassLoader>& loader2) { 3319 CHECK(descriptor != nullptr); 3320 Thread* self = Thread::Current(); 3321 SirtRef<mirror::Class> found1(self, FindClass(descriptor, loader1)); 3322 if (found1.get() == nullptr) { 3323 self->ClearException(); 3324 } 3325 mirror::Class* found2 = FindClass(descriptor, loader2); 3326 if (found2 == nullptr) { 3327 self->ClearException(); 3328 } 3329 return found1.get() == found2; 3330} 3331 3332bool ClassLinker::EnsureInitialized(const SirtRef<mirror::Class>& c, bool can_init_fields, 3333 bool can_init_parents) { 3334 DCHECK(c.get() != NULL); 3335 if (c->IsInitialized()) { 3336 return true; 3337 } 3338 3339 bool success = InitializeClass(c, can_init_fields, can_init_parents); 3340 if (!success) { 3341 if (can_init_fields && can_init_parents) { 3342 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.get()); 3343 } 3344 } 3345 return success; 3346} 3347 3348void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3349 mirror::Class* c, 3350 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3351 const byte* class_data = dex_file.GetClassData(dex_class_def); 3352 ClassDataItemIterator it(dex_file, class_data); 3353 Thread* self = Thread::Current(); 3354 SirtRef<mirror::DexCache> dex_cache(self, c->GetDexCache()); 3355 SirtRef<mirror::ClassLoader> class_loader(self, c->GetClassLoader()); 3356 CHECK(!kMovingFields); 3357 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3358 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3359 } 3360} 3361 3362bool ClassLinker::LinkClass(Thread* self, const SirtRef<mirror::Class>& klass, 3363 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3364 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3365 if (!LinkSuperClass(klass)) { 3366 return false; 3367 } 3368 if (!LinkMethods(klass, interfaces)) { 3369 return false; 3370 } 3371 if (!LinkInstanceFields(klass)) { 3372 return false; 3373 } 3374 if (!LinkStaticFields(klass)) { 3375 return false; 3376 } 3377 CreateReferenceInstanceOffsets(klass); 3378 CreateReferenceStaticOffsets(klass); 3379 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3380 klass->SetStatus(mirror::Class::kStatusResolved, self); 3381 return true; 3382} 3383 3384bool ClassLinker::LoadSuperAndInterfaces(const SirtRef<mirror::Class>& klass, 3385 const DexFile& dex_file) { 3386 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3387 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3388 uint16_t super_class_idx = class_def.superclass_idx_; 3389 if (super_class_idx != DexFile::kDexNoIndex16) { 3390 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.get()); 3391 if (super_class == NULL) { 3392 DCHECK(Thread::Current()->IsExceptionPending()); 3393 return false; 3394 } 3395 // Verify 3396 if (!klass->CanAccess(super_class)) { 3397 ThrowIllegalAccessError(klass.get(), "Class %s extended by class %s is inaccessible", 3398 PrettyDescriptor(super_class).c_str(), 3399 PrettyDescriptor(klass.get()).c_str()); 3400 return false; 3401 } 3402 klass->SetSuperClass(super_class); 3403 } 3404 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3405 if (interfaces != NULL) { 3406 for (size_t i = 0; i < interfaces->Size(); i++) { 3407 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3408 mirror::Class* interface = ResolveType(dex_file, idx, klass.get()); 3409 if (interface == NULL) { 3410 DCHECK(Thread::Current()->IsExceptionPending()); 3411 return false; 3412 } 3413 // Verify 3414 if (!klass->CanAccess(interface)) { 3415 // TODO: the RI seemed to ignore this in my testing. 3416 ThrowIllegalAccessError(klass.get(), "Interface %s implemented by class %s is inaccessible", 3417 PrettyDescriptor(interface).c_str(), 3418 PrettyDescriptor(klass.get()).c_str()); 3419 return false; 3420 } 3421 } 3422 } 3423 // Mark the class as loaded. 3424 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3425 return true; 3426} 3427 3428bool ClassLinker::LinkSuperClass(const SirtRef<mirror::Class>& klass) { 3429 CHECK(!klass->IsPrimitive()); 3430 mirror::Class* super = klass->GetSuperClass(); 3431 if (klass.get() == GetClassRoot(kJavaLangObject)) { 3432 if (super != NULL) { 3433 ThrowClassFormatError(klass.get(), "java.lang.Object must not have a superclass"); 3434 return false; 3435 } 3436 return true; 3437 } 3438 if (super == NULL) { 3439 ThrowLinkageError(klass.get(), "No superclass defined for class %s", 3440 PrettyDescriptor(klass.get()).c_str()); 3441 return false; 3442 } 3443 // Verify 3444 if (super->IsFinal() || super->IsInterface()) { 3445 ThrowIncompatibleClassChangeError(klass.get(), "Superclass %s of %s is %s", 3446 PrettyDescriptor(super).c_str(), 3447 PrettyDescriptor(klass.get()).c_str(), 3448 super->IsFinal() ? "declared final" : "an interface"); 3449 return false; 3450 } 3451 if (!klass->CanAccess(super)) { 3452 ThrowIllegalAccessError(klass.get(), "Superclass %s is inaccessible to class %s", 3453 PrettyDescriptor(super).c_str(), 3454 PrettyDescriptor(klass.get()).c_str()); 3455 return false; 3456 } 3457 3458 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3459 if (super->IsFinalizable()) { 3460 klass->SetFinalizable(); 3461 } 3462 3463 // Inherit reference flags (if any) from the superclass. 3464 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3465 if (reference_flags != 0) { 3466 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3467 } 3468 // Disallow custom direct subclasses of java.lang.ref.Reference. 3469 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3470 ThrowLinkageError(klass.get(), 3471 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3472 PrettyDescriptor(klass.get()).c_str()); 3473 return false; 3474 } 3475 3476 if (kIsDebugBuild) { 3477 // Ensure super classes are fully resolved prior to resolving fields.. 3478 while (super != NULL) { 3479 CHECK(super->IsResolved()); 3480 super = super->GetSuperClass(); 3481 } 3482 } 3483 return true; 3484} 3485 3486// Populate the class vtable and itable. Compute return type indices. 3487bool ClassLinker::LinkMethods(const SirtRef<mirror::Class>& klass, 3488 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3489 if (klass->IsInterface()) { 3490 // No vtable. 3491 size_t count = klass->NumVirtualMethods(); 3492 if (!IsUint(16, count)) { 3493 ThrowClassFormatError(klass.get(), "Too many methods on interface: %zd", count); 3494 return false; 3495 } 3496 for (size_t i = 0; i < count; ++i) { 3497 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3498 } 3499 // Link interface method tables 3500 return LinkInterfaceMethods(klass, interfaces); 3501 } else { 3502 // Link virtual and interface method tables 3503 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3504 } 3505 return true; 3506} 3507 3508bool ClassLinker::LinkVirtualMethods(const SirtRef<mirror::Class>& klass) { 3509 Thread* self = Thread::Current(); 3510 if (klass->HasSuperClass()) { 3511 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3512 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3513 CHECK_LE(actual_count, max_count); 3514 // TODO: do not assign to the vtable field until it is fully constructed. 3515 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3516 vtable(self, klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count)); 3517 if (UNLIKELY(vtable.get() == NULL)) { 3518 CHECK(self->IsExceptionPending()); // OOME. 3519 return false; 3520 } 3521 // See if any of our virtual methods override the superclass. 3522 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3523 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3524 MethodHelper local_mh(local_method); 3525 size_t j = 0; 3526 for (; j < actual_count; ++j) { 3527 mirror::ArtMethod* super_method = vtable->Get(j); 3528 MethodHelper super_mh(super_method); 3529 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3530 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3531 if (super_method->IsFinal()) { 3532 ThrowLinkageError(klass.get(), "Method %s overrides final method in class %s", 3533 PrettyMethod(local_method).c_str(), 3534 super_mh.GetDeclaringClassDescriptor()); 3535 return false; 3536 } 3537 vtable->Set<false>(j, local_method); 3538 local_method->SetMethodIndex(j); 3539 break; 3540 } else { 3541 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3542 << " would have incorrectly overridden the package-private method in " 3543 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3544 } 3545 } 3546 } 3547 if (j == actual_count) { 3548 // Not overriding, append. 3549 vtable->Set<false>(actual_count, local_method); 3550 local_method->SetMethodIndex(actual_count); 3551 actual_count += 1; 3552 } 3553 } 3554 if (!IsUint(16, actual_count)) { 3555 ThrowClassFormatError(klass.get(), "Too many methods defined on class: %zd", actual_count); 3556 return false; 3557 } 3558 // Shrink vtable if possible 3559 CHECK_LE(actual_count, max_count); 3560 if (actual_count < max_count) { 3561 vtable.reset(vtable->CopyOf(self, actual_count)); 3562 if (UNLIKELY(vtable.get() == NULL)) { 3563 CHECK(self->IsExceptionPending()); // OOME. 3564 return false; 3565 } 3566 } 3567 klass->SetVTable(vtable.get()); 3568 } else { 3569 CHECK(klass.get() == GetClassRoot(kJavaLangObject)); 3570 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3571 if (!IsUint(16, num_virtual_methods)) { 3572 ThrowClassFormatError(klass.get(), "Too many methods: %d", num_virtual_methods); 3573 return false; 3574 } 3575 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3576 vtable(self, AllocArtMethodArray(self, num_virtual_methods)); 3577 if (UNLIKELY(vtable.get() == NULL)) { 3578 CHECK(self->IsExceptionPending()); // OOME. 3579 return false; 3580 } 3581 for (size_t i = 0; i < num_virtual_methods; ++i) { 3582 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3583 vtable->Set<false>(i, virtual_method); 3584 virtual_method->SetMethodIndex(i & 0xFFFF); 3585 } 3586 klass->SetVTable(vtable.get()); 3587 } 3588 return true; 3589} 3590 3591bool ClassLinker::LinkInterfaceMethods(const SirtRef<mirror::Class>& klass, 3592 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3593 // Set the imt table to be all conflicts by default. 3594 klass->SetImTable(Runtime::Current()->GetDefaultImt()); 3595 size_t super_ifcount; 3596 if (klass->HasSuperClass()) { 3597 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3598 } else { 3599 super_ifcount = 0; 3600 } 3601 size_t ifcount = super_ifcount; 3602 uint32_t num_interfaces; 3603 { 3604 ClassHelper kh(klass.get()); 3605 num_interfaces = 3606 interfaces.get() == nullptr ? kh.NumDirectInterfaces() : interfaces->GetLength(); 3607 ifcount += num_interfaces; 3608 for (size_t i = 0; i < num_interfaces; i++) { 3609 mirror::Class* interface = 3610 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3611 ifcount += interface->GetIfTableCount(); 3612 } 3613 } 3614 if (ifcount == 0) { 3615 // Class implements no interfaces. 3616 DCHECK_EQ(klass->GetIfTableCount(), 0); 3617 DCHECK(klass->GetIfTable() == NULL); 3618 return true; 3619 } 3620 if (ifcount == super_ifcount) { 3621 // Class implements same interfaces as parent, are any of these not marker interfaces? 3622 bool has_non_marker_interface = false; 3623 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3624 for (size_t i = 0; i < ifcount; ++i) { 3625 if (super_iftable->GetMethodArrayCount(i) > 0) { 3626 has_non_marker_interface = true; 3627 break; 3628 } 3629 } 3630 if (!has_non_marker_interface) { 3631 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3632 klass->SetIfTable(super_iftable); 3633 return true; 3634 } 3635 } 3636 Thread* self = Thread::Current(); 3637 SirtRef<mirror::IfTable> iftable(self, AllocIfTable(self, ifcount)); 3638 if (UNLIKELY(iftable.get() == NULL)) { 3639 CHECK(self->IsExceptionPending()); // OOME. 3640 return false; 3641 } 3642 if (super_ifcount != 0) { 3643 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3644 for (size_t i = 0; i < super_ifcount; i++) { 3645 mirror::Class* super_interface = super_iftable->GetInterface(i); 3646 iftable->SetInterface(i, super_interface); 3647 } 3648 } 3649 // Flatten the interface inheritance hierarchy. 3650 size_t idx = super_ifcount; 3651 for (size_t i = 0; i < num_interfaces; i++) { 3652 ClassHelper kh(klass.get()); 3653 mirror::Class* interface = 3654 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3655 DCHECK(interface != NULL); 3656 if (!interface->IsInterface()) { 3657 ClassHelper ih(interface); 3658 ThrowIncompatibleClassChangeError(klass.get(), "Class %s implements non-interface class %s", 3659 PrettyDescriptor(klass.get()).c_str(), 3660 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3661 return false; 3662 } 3663 // Check if interface is already in iftable 3664 bool duplicate = false; 3665 for (size_t j = 0; j < idx; j++) { 3666 mirror::Class* existing_interface = iftable->GetInterface(j); 3667 if (existing_interface == interface) { 3668 duplicate = true; 3669 break; 3670 } 3671 } 3672 if (!duplicate) { 3673 // Add this non-duplicate interface. 3674 iftable->SetInterface(idx++, interface); 3675 // Add this interface's non-duplicate super-interfaces. 3676 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3677 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3678 bool super_duplicate = false; 3679 for (size_t k = 0; k < idx; k++) { 3680 mirror::Class* existing_interface = iftable->GetInterface(k); 3681 if (existing_interface == super_interface) { 3682 super_duplicate = true; 3683 break; 3684 } 3685 } 3686 if (!super_duplicate) { 3687 iftable->SetInterface(idx++, super_interface); 3688 } 3689 } 3690 } 3691 } 3692 // Shrink iftable in case duplicates were found 3693 if (idx < ifcount) { 3694 iftable.reset(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3695 if (UNLIKELY(iftable.get() == NULL)) { 3696 CHECK(self->IsExceptionPending()); // OOME. 3697 return false; 3698 } 3699 ifcount = idx; 3700 } else { 3701 CHECK_EQ(idx, ifcount); 3702 } 3703 klass->SetIfTable(iftable.get()); 3704 3705 // If we're an interface, we don't need the vtable pointers, so we're done. 3706 if (klass->IsInterface()) { 3707 return true; 3708 } 3709 // Allocate imtable 3710 bool imtable_changed = false; 3711 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > imtable(self, AllocArtMethodArray(self, kImtSize)); 3712 if (UNLIKELY(imtable.get() == NULL)) { 3713 CHECK(self->IsExceptionPending()); // OOME. 3714 return false; 3715 } 3716 std::vector<mirror::ArtMethod*> miranda_list; 3717 for (size_t i = 0; i < ifcount; ++i) { 3718 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 3719 if (num_methods > 0) { 3720 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3721 method_array(self, AllocArtMethodArray(self, num_methods)); 3722 if (UNLIKELY(method_array.get() == nullptr)) { 3723 CHECK(self->IsExceptionPending()); // OOME. 3724 return false; 3725 } 3726 iftable->SetMethodArray(i, method_array.get()); 3727 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > vtable(self, 3728 klass->GetVTableDuringLinking()); 3729 for (size_t j = 0; j < num_methods; ++j) { 3730 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 3731 MethodHelper interface_mh(interface_method); 3732 int32_t k; 3733 // For each method listed in the interface's method list, find the 3734 // matching method in our class's method list. We want to favor the 3735 // subclass over the superclass, which just requires walking 3736 // back from the end of the vtable. (This only matters if the 3737 // superclass defines a private method and this class redefines 3738 // it -- otherwise it would use the same vtable slot. In .dex files 3739 // those don't end up in the virtual method table, so it shouldn't 3740 // matter which direction we go. We walk it backward anyway.) 3741 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3742 mirror::ArtMethod* vtable_method = vtable->Get(k); 3743 MethodHelper vtable_mh(vtable_method); 3744 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3745 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3746 ThrowIllegalAccessError(klass.get(), 3747 "Method '%s' implementing interface method '%s' is not public", 3748 PrettyMethod(vtable_method).c_str(), 3749 PrettyMethod(interface_method).c_str()); 3750 return false; 3751 } 3752 method_array->Set<false>(j, vtable_method); 3753 // Place method in imt if entry is empty, place conflict otherwise. 3754 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3755 if (imtable->Get(imt_index) == NULL) { 3756 imtable->Set<false>(imt_index, vtable_method); 3757 imtable_changed = true; 3758 } else { 3759 imtable->Set<false>(imt_index, Runtime::Current()->GetImtConflictMethod()); 3760 } 3761 break; 3762 } 3763 } 3764 if (k < 0) { 3765 SirtRef<mirror::ArtMethod> miranda_method(self, NULL); 3766 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3767 mirror::ArtMethod* mir_method = miranda_list[mir]; 3768 MethodHelper vtable_mh(mir_method); 3769 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3770 miranda_method.reset(miranda_list[mir]); 3771 break; 3772 } 3773 } 3774 if (miranda_method.get() == NULL) { 3775 // Point the interface table at a phantom slot. 3776 miranda_method.reset(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3777 if (UNLIKELY(miranda_method.get() == NULL)) { 3778 CHECK(self->IsExceptionPending()); // OOME. 3779 return false; 3780 } 3781 // TODO: If a methods move then the miranda_list may hold stale references. 3782 miranda_list.push_back(miranda_method.get()); 3783 } 3784 method_array->Set<false>(j, miranda_method.get()); 3785 } 3786 } 3787 } 3788 } 3789 if (imtable_changed) { 3790 // Fill in empty entries in interface method table with conflict. 3791 mirror::ArtMethod* imt_conflict_method = Runtime::Current()->GetImtConflictMethod(); 3792 for (size_t i = 0; i < kImtSize; i++) { 3793 if (imtable->Get(i) == NULL) { 3794 imtable->Set<false>(i, imt_conflict_method); 3795 } 3796 } 3797 klass->SetImTable(imtable.get()); 3798 } 3799 if (!miranda_list.empty()) { 3800 int old_method_count = klass->NumVirtualMethods(); 3801 int new_method_count = old_method_count + miranda_list.size(); 3802 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3803 if (old_method_count == 0) { 3804 virtuals = AllocArtMethodArray(self, new_method_count); 3805 } else { 3806 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3807 } 3808 if (UNLIKELY(virtuals == NULL)) { 3809 CHECK(self->IsExceptionPending()); // OOME. 3810 return false; 3811 } 3812 klass->SetVirtualMethods(virtuals); 3813 3814 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3815 vtable(self, klass->GetVTableDuringLinking()); 3816 CHECK(vtable.get() != NULL); 3817 int old_vtable_count = vtable->GetLength(); 3818 int new_vtable_count = old_vtable_count + miranda_list.size(); 3819 vtable.reset(vtable->CopyOf(self, new_vtable_count)); 3820 if (UNLIKELY(vtable.get() == NULL)) { 3821 CHECK(self->IsExceptionPending()); // OOME. 3822 return false; 3823 } 3824 for (size_t i = 0; i < miranda_list.size(); ++i) { 3825 mirror::ArtMethod* method = miranda_list[i]; 3826 // Leave the declaring class alone as type indices are relative to it 3827 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3828 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3829 klass->SetVirtualMethod(old_method_count + i, method); 3830 vtable->Set<false>(old_vtable_count + i, method); 3831 } 3832 // TODO: do not assign to the vtable field until it is fully constructed. 3833 klass->SetVTable(vtable.get()); 3834 } 3835 3836 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3837 for (int i = 0; i < vtable->GetLength(); ++i) { 3838 CHECK(vtable->Get(i) != NULL); 3839 } 3840 3841// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3842 3843 return true; 3844} 3845 3846bool ClassLinker::LinkInstanceFields(const SirtRef<mirror::Class>& klass) { 3847 CHECK(klass.get() != NULL); 3848 return LinkFields(klass, false); 3849} 3850 3851bool ClassLinker::LinkStaticFields(const SirtRef<mirror::Class>& klass) { 3852 CHECK(klass.get() != NULL); 3853 size_t allocated_class_size = klass->GetClassSize(); 3854 bool success = LinkFields(klass, true); 3855 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3856 return success; 3857} 3858 3859struct LinkFieldsComparator { 3860 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3861 } 3862 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3863 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 3864 NO_THREAD_SAFETY_ANALYSIS { 3865 // First come reference fields, then 64-bit, and finally 32-bit 3866 FieldHelper fh1(field1); 3867 Primitive::Type type1 = fh1.GetTypeAsPrimitiveType(); 3868 FieldHelper fh2(field2); 3869 Primitive::Type type2 = fh2.GetTypeAsPrimitiveType(); 3870 if (type1 != type2) { 3871 bool is_primitive1 = type1 != Primitive::kPrimNot; 3872 bool is_primitive2 = type2 != Primitive::kPrimNot; 3873 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3874 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3875 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 3876 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 3877 if (order1 != order2) { 3878 return order1 < order2; 3879 } 3880 } 3881 // same basic group? then sort by string. 3882 const char* name1 = fh1.GetName(); 3883 const char* name2 = fh2.GetName(); 3884 return strcmp(name1, name2) < 0; 3885 } 3886}; 3887 3888bool ClassLinker::LinkFields(const SirtRef<mirror::Class>& klass, bool is_static) { 3889 size_t num_fields = 3890 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3891 3892 mirror::ObjectArray<mirror::ArtField>* fields = 3893 is_static ? klass->GetSFields() : klass->GetIFields(); 3894 3895 // Initialize size and field_offset 3896 size_t size; 3897 MemberOffset field_offset(0); 3898 if (is_static) { 3899 size = klass->GetClassSize(); 3900 field_offset = mirror::Class::FieldsOffset(); 3901 } else { 3902 mirror::Class* super_class = klass->GetSuperClass(); 3903 if (super_class != NULL) { 3904 CHECK(super_class->IsResolved()); 3905 field_offset = MemberOffset(super_class->GetObjectSize()); 3906 } 3907 size = field_offset.Uint32Value(); 3908 } 3909 3910 CHECK_EQ(num_fields == 0, fields == NULL); 3911 3912 // we want a relatively stable order so that adding new fields 3913 // minimizes disruption of C++ version such as Class and Method. 3914 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3915 for (size_t i = 0; i < num_fields; i++) { 3916 mirror::ArtField* f = fields->Get(i); 3917 CHECK(f != NULL); 3918 grouped_and_sorted_fields.push_back(f); 3919 } 3920 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 3921 LinkFieldsComparator()); 3922 3923 // References should be at the front. 3924 size_t current_field = 0; 3925 size_t num_reference_fields = 0; 3926 for (; current_field < num_fields; current_field++) { 3927 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3928 FieldHelper fh(field); 3929 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3930 bool isPrimitive = type != Primitive::kPrimNot; 3931 if (isPrimitive) { 3932 break; // past last reference, move on to the next phase 3933 } 3934 grouped_and_sorted_fields.pop_front(); 3935 num_reference_fields++; 3936 fields->Set<false>(current_field, field); 3937 field->SetOffset(field_offset); 3938 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3939 } 3940 3941 // Now we want to pack all of the double-wide fields together. If 3942 // we're not aligned, though, we want to shuffle one 32-bit field 3943 // into place. If we can't find one, we'll have to pad it. 3944 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3945 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3946 mirror::ArtField* field = grouped_and_sorted_fields[i]; 3947 FieldHelper fh(field); 3948 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3949 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3950 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 3951 continue; 3952 } 3953 fields->Set<false>(current_field++, field); 3954 field->SetOffset(field_offset); 3955 // drop the consumed field 3956 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 3957 break; 3958 } 3959 // whether we found a 32-bit field for padding or not, we advance 3960 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3961 } 3962 3963 // Alignment is good, shuffle any double-wide fields forward, and 3964 // finish assigning field offsets to all fields. 3965 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 3966 while (!grouped_and_sorted_fields.empty()) { 3967 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3968 grouped_and_sorted_fields.pop_front(); 3969 FieldHelper fh(field); 3970 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3971 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3972 fields->Set<false>(current_field, field); 3973 field->SetOffset(field_offset); 3974 field_offset = MemberOffset(field_offset.Uint32Value() + 3975 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 3976 ? sizeof(uint64_t) 3977 : sizeof(uint32_t))); 3978 current_field++; 3979 } 3980 3981 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 3982 if (!is_static && 3983 (strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0)) { 3984 // We know there are no non-reference fields in the Reference classes, and we know 3985 // that 'referent' is alphabetically last, so this is easy... 3986 CHECK_EQ(num_reference_fields, num_fields); 3987 FieldHelper fh(fields->Get(num_fields - 1)); 3988 CHECK_STREQ(fh.GetName(), "referent"); 3989 --num_reference_fields; 3990 } 3991 3992 if (kIsDebugBuild) { 3993 // Make sure that all reference fields appear before 3994 // non-reference fields, and all double-wide fields are aligned. 3995 bool seen_non_ref = false; 3996 for (size_t i = 0; i < num_fields; i++) { 3997 mirror::ArtField* field = fields->Get(i); 3998 if (false) { // enable to debug field layout 3999 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4000 << " class=" << PrettyClass(klass.get()) 4001 << " field=" << PrettyField(field) 4002 << " offset=" << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset()), 4003 false); 4004 } 4005 FieldHelper fh(field); 4006 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4007 bool is_primitive = type != Primitive::kPrimNot; 4008 if ((strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0) 4009 && (strcmp("referent", fh.GetName()) == 0)) { 4010 is_primitive = true; // We lied above, so we have to expect a lie here. 4011 } 4012 if (is_primitive) { 4013 if (!seen_non_ref) { 4014 seen_non_ref = true; 4015 DCHECK_EQ(num_reference_fields, i); 4016 } 4017 } else { 4018 DCHECK(!seen_non_ref); 4019 } 4020 } 4021 if (!seen_non_ref) { 4022 DCHECK_EQ(num_fields, num_reference_fields); 4023 } 4024 } 4025 size = field_offset.Uint32Value(); 4026 // Update klass 4027 if (is_static) { 4028 klass->SetNumReferenceStaticFields(num_reference_fields); 4029 klass->SetClassSize(size); 4030 } else { 4031 klass->SetNumReferenceInstanceFields(num_reference_fields); 4032 if (!klass->IsVariableSize()) { 4033 DCHECK_GE(size, sizeof(mirror::Object)) << ClassHelper(klass.get()).GetDescriptor(); 4034 size_t previous_size = klass->GetObjectSize(); 4035 if (previous_size != 0) { 4036 // Make sure that we didn't originally have an incorrect size. 4037 CHECK_EQ(previous_size, size); 4038 } 4039 klass->SetObjectSize(size); 4040 } 4041 } 4042 return true; 4043} 4044 4045// Set the bitmap of reference offsets, refOffsets, from the ifields 4046// list. 4047void ClassLinker::CreateReferenceInstanceOffsets(const SirtRef<mirror::Class>& klass) { 4048 uint32_t reference_offsets = 0; 4049 mirror::Class* super_class = klass->GetSuperClass(); 4050 if (super_class != NULL) { 4051 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4052 // If our superclass overflowed, we don't stand a chance. 4053 if (reference_offsets == CLASS_WALK_SUPER) { 4054 klass->SetReferenceInstanceOffsets(reference_offsets); 4055 return; 4056 } 4057 } 4058 CreateReferenceOffsets(klass, false, reference_offsets); 4059} 4060 4061void ClassLinker::CreateReferenceStaticOffsets(const SirtRef<mirror::Class>& klass) { 4062 CreateReferenceOffsets(klass, true, 0); 4063} 4064 4065void ClassLinker::CreateReferenceOffsets(const SirtRef<mirror::Class>& klass, bool is_static, 4066 uint32_t reference_offsets) { 4067 size_t num_reference_fields = 4068 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4069 : klass->NumReferenceInstanceFieldsDuringLinking(); 4070 mirror::ObjectArray<mirror::ArtField>* fields = 4071 is_static ? klass->GetSFields() : klass->GetIFields(); 4072 // All of the fields that contain object references are guaranteed 4073 // to be at the beginning of the fields list. 4074 for (size_t i = 0; i < num_reference_fields; ++i) { 4075 // Note that byte_offset is the offset from the beginning of 4076 // object, not the offset into instance data 4077 mirror::ArtField* field = fields->Get(i); 4078 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4079 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4080 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4081 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4082 CHECK_NE(new_bit, 0U); 4083 reference_offsets |= new_bit; 4084 } else { 4085 reference_offsets = CLASS_WALK_SUPER; 4086 break; 4087 } 4088 } 4089 // Update fields in klass 4090 if (is_static) { 4091 klass->SetReferenceStaticOffsets(reference_offsets); 4092 } else { 4093 klass->SetReferenceInstanceOffsets(reference_offsets); 4094 } 4095} 4096 4097mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4098 const SirtRef<mirror::DexCache>& dex_cache) { 4099 DCHECK(dex_cache.get() != nullptr); 4100 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4101 if (resolved != NULL) { 4102 return resolved; 4103 } 4104 uint32_t utf16_length; 4105 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4106 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4107 dex_cache->SetResolvedString(string_idx, string); 4108 return string; 4109} 4110 4111mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4112 mirror::Class* referrer) { 4113 Thread* self = Thread::Current(); 4114 SirtRef<mirror::DexCache> dex_cache(self, referrer->GetDexCache()); 4115 SirtRef<mirror::ClassLoader> class_loader(self, referrer->GetClassLoader()); 4116 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4117} 4118 4119mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4120 const SirtRef<mirror::DexCache>& dex_cache, 4121 const SirtRef<mirror::ClassLoader>& class_loader) { 4122 DCHECK(dex_cache.get() != NULL); 4123 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4124 if (resolved == NULL) { 4125 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4126 resolved = FindClass(descriptor, class_loader); 4127 if (resolved != NULL) { 4128 // TODO: we used to throw here if resolved's class loader was not the 4129 // boot class loader. This was to permit different classes with the 4130 // same name to be loaded simultaneously by different loaders 4131 dex_cache->SetResolvedType(type_idx, resolved); 4132 } else { 4133 Thread* self = Thread::Current(); 4134 CHECK(self->IsExceptionPending()) 4135 << "Expected pending exception for failed resolution of: " << descriptor; 4136 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4137 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 4138 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4139 DCHECK(resolved == NULL); // No SirtRef needed to preserve resolved. 4140 Thread::Current()->ClearException(); 4141 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4142 self->GetException(NULL)->SetCause(cause.get()); 4143 } 4144 } 4145 } 4146 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4147 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4148 return resolved; 4149} 4150 4151mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 4152 uint32_t method_idx, 4153 const SirtRef<mirror::DexCache>& dex_cache, 4154 const SirtRef<mirror::ClassLoader>& class_loader, 4155 mirror::ArtMethod* referrer, 4156 InvokeType type) { 4157 DCHECK(dex_cache.get() != NULL); 4158 // Check for hit in the dex cache. 4159 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4160 if (resolved != NULL && !resolved->IsRuntimeMethod()) { 4161 return resolved; 4162 } 4163 // Fail, get the declaring class. 4164 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4165 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4166 if (klass == NULL) { 4167 DCHECK(Thread::Current()->IsExceptionPending()); 4168 return NULL; 4169 } 4170 // Scan using method_idx, this saves string compares but will only hit for matching dex 4171 // caches/files. 4172 switch (type) { 4173 case kDirect: // Fall-through. 4174 case kStatic: 4175 resolved = klass->FindDirectMethod(dex_cache.get(), method_idx); 4176 break; 4177 case kInterface: 4178 resolved = klass->FindInterfaceMethod(dex_cache.get(), method_idx); 4179 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4180 break; 4181 case kSuper: // Fall-through. 4182 case kVirtual: 4183 resolved = klass->FindVirtualMethod(dex_cache.get(), method_idx); 4184 break; 4185 default: 4186 LOG(FATAL) << "Unreachable - invocation type: " << type; 4187 } 4188 if (resolved == NULL) { 4189 // Search by name, which works across dex files. 4190 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4191 const Signature signature = dex_file.GetMethodSignature(method_id); 4192 switch (type) { 4193 case kDirect: // Fall-through. 4194 case kStatic: 4195 resolved = klass->FindDirectMethod(name, signature); 4196 break; 4197 case kInterface: 4198 resolved = klass->FindInterfaceMethod(name, signature); 4199 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4200 break; 4201 case kSuper: // Fall-through. 4202 case kVirtual: 4203 resolved = klass->FindVirtualMethod(name, signature); 4204 break; 4205 } 4206 } 4207 if (resolved != NULL) { 4208 // We found a method, check for incompatible class changes. 4209 if (resolved->CheckIncompatibleClassChange(type)) { 4210 resolved = NULL; 4211 } 4212 } 4213 if (resolved != NULL) { 4214 // Be a good citizen and update the dex cache to speed subsequent calls. 4215 dex_cache->SetResolvedMethod(method_idx, resolved); 4216 return resolved; 4217 } else { 4218 // We failed to find the method which means either an access error, an incompatible class 4219 // change, or no such method. First try to find the method among direct and virtual methods. 4220 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4221 const Signature signature = dex_file.GetMethodSignature(method_id); 4222 switch (type) { 4223 case kDirect: 4224 case kStatic: 4225 resolved = klass->FindVirtualMethod(name, signature); 4226 break; 4227 case kInterface: 4228 case kVirtual: 4229 case kSuper: 4230 resolved = klass->FindDirectMethod(name, signature); 4231 break; 4232 } 4233 4234 // If we found something, check that it can be accessed by the referrer. 4235 if (resolved != NULL && referrer != NULL) { 4236 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4237 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4238 if (!referring_class->CanAccess(methods_class)) { 4239 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4240 resolved, type); 4241 return NULL; 4242 } else if (!referring_class->CanAccessMember(methods_class, 4243 resolved->GetAccessFlags())) { 4244 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4245 return NULL; 4246 } 4247 } 4248 4249 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4250 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4251 switch (type) { 4252 case kDirect: 4253 case kStatic: 4254 if (resolved != NULL) { 4255 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4256 } else { 4257 resolved = klass->FindInterfaceMethod(name, signature); 4258 if (resolved != NULL) { 4259 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4260 } else { 4261 ThrowNoSuchMethodError(type, klass, name, signature); 4262 } 4263 } 4264 break; 4265 case kInterface: 4266 if (resolved != NULL) { 4267 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4268 } else { 4269 resolved = klass->FindVirtualMethod(name, signature); 4270 if (resolved != NULL) { 4271 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4272 } else { 4273 ThrowNoSuchMethodError(type, klass, name, signature); 4274 } 4275 } 4276 break; 4277 case kSuper: 4278 ThrowNoSuchMethodError(type, klass, name, signature); 4279 break; 4280 case kVirtual: 4281 if (resolved != NULL) { 4282 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4283 } else { 4284 resolved = klass->FindInterfaceMethod(name, signature); 4285 if (resolved != NULL) { 4286 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4287 } else { 4288 ThrowNoSuchMethodError(type, klass, name, signature); 4289 } 4290 } 4291 break; 4292 } 4293 DCHECK(Thread::Current()->IsExceptionPending()); 4294 return NULL; 4295 } 4296} 4297 4298mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4299 const SirtRef<mirror::DexCache>& dex_cache, 4300 const SirtRef<mirror::ClassLoader>& class_loader, 4301 bool is_static) { 4302 DCHECK(dex_cache.get() != nullptr); 4303 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4304 if (resolved != NULL) { 4305 return resolved; 4306 } 4307 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4308 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4309 if (klass == NULL) { 4310 DCHECK(Thread::Current()->IsExceptionPending()); 4311 return NULL; 4312 } 4313 4314 if (is_static) { 4315 resolved = klass->FindStaticField(dex_cache.get(), field_idx); 4316 } else { 4317 resolved = klass->FindInstanceField(dex_cache.get(), field_idx); 4318 } 4319 4320 if (resolved == NULL) { 4321 const char* name = dex_file.GetFieldName(field_id); 4322 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4323 if (is_static) { 4324 resolved = klass->FindStaticField(name, type); 4325 } else { 4326 resolved = klass->FindInstanceField(name, type); 4327 } 4328 if (resolved == NULL) { 4329 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 4330 return NULL; 4331 } 4332 } 4333 dex_cache->SetResolvedField(field_idx, resolved); 4334 return resolved; 4335} 4336 4337mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4338 uint32_t field_idx, 4339 const SirtRef<mirror::DexCache>& dex_cache, 4340 const SirtRef<mirror::ClassLoader>& class_loader) { 4341 DCHECK(dex_cache.get() != nullptr); 4342 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4343 if (resolved != NULL) { 4344 return resolved; 4345 } 4346 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4347 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4348 if (klass == NULL) { 4349 DCHECK(Thread::Current()->IsExceptionPending()); 4350 return NULL; 4351 } 4352 4353 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4354 StringPiece type(dex_file.StringDataByIdx( 4355 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4356 resolved = klass->FindField(name, type); 4357 if (resolved != NULL) { 4358 dex_cache->SetResolvedField(field_idx, resolved); 4359 } else { 4360 ThrowNoSuchFieldError("", klass, type, name); 4361 } 4362 return resolved; 4363} 4364 4365const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4366 uint32_t* length) { 4367 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4368 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4369 const DexFile& dex_file = *dex_cache->GetDexFile(); 4370 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4371 return dex_file.GetMethodShorty(method_id, length); 4372} 4373 4374void ClassLinker::DumpAllClasses(int flags) { 4375 if (dex_cache_image_class_lookup_required_) { 4376 MoveImageClassesToClassTable(); 4377 } 4378 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4379 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4380 std::vector<mirror::Class*> all_classes; 4381 { 4382 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4383 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 4384 all_classes.push_back(it.second); 4385 } 4386 } 4387 4388 for (size_t i = 0; i < all_classes.size(); ++i) { 4389 all_classes[i]->DumpClass(std::cerr, flags); 4390 } 4391} 4392 4393void ClassLinker::DumpForSigQuit(std::ostream& os) { 4394 if (dex_cache_image_class_lookup_required_) { 4395 MoveImageClassesToClassTable(); 4396 } 4397 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4398 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4399} 4400 4401size_t ClassLinker::NumLoadedClasses() { 4402 if (dex_cache_image_class_lookup_required_) { 4403 MoveImageClassesToClassTable(); 4404 } 4405 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4406 return class_table_.size(); 4407} 4408 4409pid_t ClassLinker::GetClassesLockOwner() { 4410 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4411} 4412 4413pid_t ClassLinker::GetDexLockOwner() { 4414 return dex_lock_.GetExclusiveOwnerTid(); 4415} 4416 4417void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4418 DCHECK(!init_done_); 4419 4420 DCHECK(klass != NULL); 4421 DCHECK(klass->GetClassLoader() == NULL); 4422 4423 DCHECK(class_roots_ != NULL); 4424 DCHECK(class_roots_->Get(class_root) == NULL); 4425 class_roots_->Set<false>(class_root, klass); 4426} 4427 4428} // namespace art 4429