class_linker.cc revision 073278cd7129ff07dbcd6ccfabd2c34f47ec92ad
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 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1124 Thread* self = Thread::Current(); 1125 { 1126 ReaderMutexLock mu(self, dex_lock_); 1127 if (!only_dirty || dex_caches_dirty_) { 1128 for (mirror::DexCache*& dex_cache : dex_caches_) { 1129 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1130 DCHECK(dex_cache != nullptr); 1131 } 1132 if (clean_dirty) { 1133 dex_caches_dirty_ = false; 1134 } 1135 } 1136 } 1137 { 1138 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 1139 if (!only_dirty || class_table_dirty_) { 1140 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1141 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1142 DCHECK(it.second != nullptr); 1143 } 1144 if (clean_dirty) { 1145 class_table_dirty_ = false; 1146 } 1147 } 1148 // We deliberately ignore the class roots in the image since we 1149 // handle image roots by using the MS/CMS rescanning of dirty cards. 1150 } 1151 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1152 DCHECK(array_iftable_ != nullptr); 1153} 1154 1155void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1156 if (dex_cache_image_class_lookup_required_) { 1157 MoveImageClassesToClassTable(); 1158 } 1159 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1160 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 1161 if (!visitor(it.second, arg)) { 1162 return; 1163 } 1164 } 1165} 1166 1167static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1168 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1169 classes->insert(c); 1170 return true; 1171} 1172 1173void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1174 std::set<mirror::Class*> classes; 1175 VisitClasses(GetClassesVisitor, &classes); 1176 for (mirror::Class* klass : classes) { 1177 if (!visitor(klass, arg)) { 1178 return; 1179 } 1180 } 1181} 1182 1183ClassLinker::~ClassLinker() { 1184 mirror::Class::ResetClass(); 1185 mirror::String::ResetClass(); 1186 mirror::ArtField::ResetClass(); 1187 mirror::ArtMethod::ResetClass(); 1188 mirror::BooleanArray::ResetArrayClass(); 1189 mirror::ByteArray::ResetArrayClass(); 1190 mirror::CharArray::ResetArrayClass(); 1191 mirror::DoubleArray::ResetArrayClass(); 1192 mirror::FloatArray::ResetArrayClass(); 1193 mirror::IntArray::ResetArrayClass(); 1194 mirror::LongArray::ResetArrayClass(); 1195 mirror::ShortArray::ResetArrayClass(); 1196 mirror::Throwable::ResetClass(); 1197 mirror::StackTraceElement::ResetClass(); 1198 STLDeleteElements(&boot_class_path_); 1199 STLDeleteElements(&oat_files_); 1200} 1201 1202mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1203 gc::Heap* heap = Runtime::Current()->GetHeap(); 1204 SirtRef<mirror::Class> dex_cache_class(self, GetClassRoot(kJavaLangDexCache)); 1205 SirtRef<mirror::DexCache> dex_cache( 1206 self, down_cast<mirror::DexCache*>( 1207 heap->AllocObject<true>(self, dex_cache_class.get(), dex_cache_class->GetObjectSize()))); 1208 if (dex_cache.get() == NULL) { 1209 return NULL; 1210 } 1211 SirtRef<mirror::String> 1212 location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str())); 1213 if (location.get() == NULL) { 1214 return NULL; 1215 } 1216 SirtRef<mirror::ObjectArray<mirror::String> > 1217 strings(self, AllocStringArray(self, dex_file.NumStringIds())); 1218 if (strings.get() == NULL) { 1219 return NULL; 1220 } 1221 SirtRef<mirror::ObjectArray<mirror::Class> > 1222 types(self, AllocClassArray(self, dex_file.NumTypeIds())); 1223 if (types.get() == NULL) { 1224 return NULL; 1225 } 1226 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 1227 methods(self, AllocArtMethodArray(self, dex_file.NumMethodIds())); 1228 if (methods.get() == NULL) { 1229 return NULL; 1230 } 1231 SirtRef<mirror::ObjectArray<mirror::ArtField> > 1232 fields(self, AllocArtFieldArray(self, dex_file.NumFieldIds())); 1233 if (fields.get() == NULL) { 1234 return NULL; 1235 } 1236 dex_cache->Init(&dex_file, location.get(), strings.get(), types.get(), methods.get(), 1237 fields.get()); 1238 return dex_cache.get(); 1239} 1240 1241mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1242 size_t class_size) { 1243 DCHECK_GE(class_size, sizeof(mirror::Class)); 1244 gc::Heap* heap = Runtime::Current()->GetHeap(); 1245 mirror::Object* k = 1246 kMovingClasses ? 1247 heap->AllocObject<true>(self, java_lang_Class, class_size) : 1248 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size); 1249 if (UNLIKELY(k == NULL)) { 1250 CHECK(self->IsExceptionPending()); // OOME. 1251 return NULL; 1252 } 1253 mirror::Class* klass = k->AsClass(); 1254 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1255 klass->SetClassSize(class_size); 1256 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1257 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1258 return klass; 1259} 1260 1261mirror::Class* ClassLinker::AllocClass(Thread* self, size_t class_size) { 1262 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1263} 1264 1265mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1266 return down_cast<mirror::ArtField*>( 1267 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1268} 1269 1270mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1271 return down_cast<mirror::ArtMethod*>( 1272 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1273} 1274 1275mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1276 Thread* self, size_t length) { 1277 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1278 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1279} 1280 1281static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1282 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1283 DCHECK(klass != NULL); 1284 // Wait for the class if it has not already been linked. 1285 if (!klass->IsResolved() && !klass->IsErroneous()) { 1286 SirtRef<mirror::Class> sirt_class(self, klass); 1287 ObjectLock<mirror::Class> lock(self, &sirt_class); 1288 // Check for circular dependencies between classes. 1289 if (!sirt_class->IsResolved() && sirt_class->GetClinitThreadId() == self->GetTid()) { 1290 ThrowClassCircularityError(sirt_class.get()); 1291 sirt_class->SetStatus(mirror::Class::kStatusError, self); 1292 return nullptr; 1293 } 1294 // Wait for the pending initialization to complete. 1295 while (!sirt_class->IsResolved() && !sirt_class->IsErroneous()) { 1296 lock.WaitIgnoringInterrupts(); 1297 } 1298 klass = sirt_class.get(); 1299 } 1300 if (klass->IsErroneous()) { 1301 ThrowEarlierClassFailure(klass); 1302 return nullptr; 1303 } 1304 // Return the loaded class. No exceptions should be pending. 1305 CHECK(klass->IsResolved()) << PrettyClass(klass); 1306 self->AssertNoPendingException(); 1307 return klass; 1308} 1309 1310bool ClassLinker::IsInBootClassPath(const char* descriptor) { 1311 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1312 return pair.second != NULL; 1313} 1314 1315mirror::Class* ClassLinker::FindSystemClass(const char* descriptor) { 1316 SirtRef<mirror::ClassLoader> class_loader(Thread::Current(), nullptr); 1317 return FindClass(descriptor, class_loader); 1318} 1319 1320mirror::Class* ClassLinker::FindClass(const char* descriptor, 1321 const SirtRef<mirror::ClassLoader>& class_loader) { 1322 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1323 Thread* self = Thread::Current(); 1324 DCHECK(self != NULL); 1325 self->AssertNoPendingException(); 1326 if (descriptor[1] == '\0') { 1327 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1328 // for primitive classes that aren't backed by dex files. 1329 return FindPrimitiveClass(descriptor[0]); 1330 } 1331 // Find the class in the loaded classes table. 1332 mirror::Class* klass = LookupClass(descriptor, class_loader.get()); 1333 if (klass != NULL) { 1334 return EnsureResolved(self, klass); 1335 } 1336 // Class is not yet loaded. 1337 if (descriptor[0] == '[') { 1338 return CreateArrayClass(descriptor, class_loader); 1339 } else if (class_loader.get() == nullptr) { 1340 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1341 if (pair.second != NULL) { 1342 SirtRef<mirror::ClassLoader> class_loader(self, nullptr); 1343 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1344 } 1345 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1346 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1347 // throw of a NoClassDefFoundError. 1348 if (IsInBootClassPath(descriptor)) { 1349 mirror::Class* system_class = FindSystemClass(descriptor); 1350 CHECK(system_class != NULL); 1351 return system_class; 1352 } 1353 // Next try the compile time class path. 1354 const std::vector<const DexFile*>* class_path; 1355 { 1356 ScopedObjectAccessUnchecked soa(self); 1357 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1358 soa.AddLocalReference<jobject>(class_loader.get())); 1359 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1360 } 1361 1362 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1363 if (pair.second != NULL) { 1364 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1365 } 1366 1367 } else { 1368 ScopedObjectAccessUnchecked soa(self->GetJniEnv()); 1369 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1370 soa.AddLocalReference<jobject>(class_loader.get())); 1371 std::string class_name_string(DescriptorToDot(descriptor)); 1372 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1373 { 1374 ScopedThreadStateChange tsc(self, kNative); 1375 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1376 soa.Env()->NewStringUTF(class_name_string.c_str())); 1377 if (class_name_object.get() == NULL) { 1378 return NULL; 1379 } 1380 CHECK(class_loader_object.get() != NULL); 1381 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1382 WellKnownClasses::java_lang_ClassLoader_loadClass, 1383 class_name_object.get())); 1384 } 1385 if (soa.Self()->IsExceptionPending()) { 1386 // If the ClassLoader threw, pass that exception up. 1387 return NULL; 1388 } else if (result.get() == NULL) { 1389 // broken loader - throw NPE to be compatible with Dalvik 1390 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1391 class_name_string.c_str()).c_str()); 1392 return NULL; 1393 } else { 1394 // success, return mirror::Class* 1395 return soa.Decode<mirror::Class*>(result.get()); 1396 } 1397 } 1398 1399 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1400 return NULL; 1401} 1402 1403mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1404 const SirtRef<mirror::ClassLoader>& class_loader, 1405 const DexFile& dex_file, 1406 const DexFile::ClassDef& dex_class_def) { 1407 Thread* self = Thread::Current(); 1408 SirtRef<mirror::Class> klass(self, NULL); 1409 // Load the class from the dex file. 1410 if (UNLIKELY(!init_done_)) { 1411 // finish up init of hand crafted class_roots_ 1412 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1413 klass.reset(GetClassRoot(kJavaLangObject)); 1414 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1415 klass.reset(GetClassRoot(kJavaLangClass)); 1416 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1417 klass.reset(GetClassRoot(kJavaLangString)); 1418 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1419 klass.reset(GetClassRoot(kJavaLangDexCache)); 1420 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1421 klass.reset(GetClassRoot(kJavaLangReflectArtField)); 1422 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1423 klass.reset(GetClassRoot(kJavaLangReflectArtMethod)); 1424 } else { 1425 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1426 } 1427 } else { 1428 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1429 } 1430 if (UNLIKELY(klass.get() == NULL)) { 1431 CHECK(self->IsExceptionPending()); // Expect an OOME. 1432 return NULL; 1433 } 1434 klass->SetDexCache(FindDexCache(dex_file)); 1435 LoadClass(dex_file, dex_class_def, klass, class_loader.get()); 1436 // Check for a pending exception during load 1437 if (self->IsExceptionPending()) { 1438 klass->SetStatus(mirror::Class::kStatusError, self); 1439 return NULL; 1440 } 1441 ObjectLock<mirror::Class> lock(self, &klass); 1442 klass->SetClinitThreadId(self->GetTid()); 1443 // Add the newly loaded class to the loaded classes table. 1444 mirror::Class* existing = InsertClass(descriptor, klass.get(), Hash(descriptor)); 1445 if (existing != NULL) { 1446 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1447 // this thread to block. 1448 return EnsureResolved(self, existing); 1449 } 1450 // Finish loading (if necessary) by finding parents 1451 CHECK(!klass->IsLoaded()); 1452 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1453 // Loading failed. 1454 klass->SetStatus(mirror::Class::kStatusError, self); 1455 return NULL; 1456 } 1457 CHECK(klass->IsLoaded()); 1458 // Link the class (if necessary) 1459 CHECK(!klass->IsResolved()); 1460 // TODO: Use fast jobjects? 1461 SirtRef<mirror::ObjectArray<mirror::Class> > interfaces(self, nullptr); 1462 if (!LinkClass(self, klass, interfaces)) { 1463 // Linking failed. 1464 klass->SetStatus(mirror::Class::kStatusError, self); 1465 return NULL; 1466 } 1467 CHECK(klass->IsResolved()); 1468 1469 /* 1470 * We send CLASS_PREPARE events to the debugger from here. The 1471 * definition of "preparation" is creating the static fields for a 1472 * class and initializing them to the standard default values, but not 1473 * executing any code (that comes later, during "initialization"). 1474 * 1475 * We did the static preparation in LinkClass. 1476 * 1477 * The class has been prepared and resolved but possibly not yet verified 1478 * at this point. 1479 */ 1480 Dbg::PostClassPrepare(klass.get()); 1481 1482 return klass.get(); 1483} 1484 1485// Precomputes size that will be needed for Class, matching LinkStaticFields 1486size_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1487 const DexFile::ClassDef& dex_class_def) { 1488 const byte* class_data = dex_file.GetClassData(dex_class_def); 1489 size_t num_ref = 0; 1490 size_t num_32 = 0; 1491 size_t num_64 = 0; 1492 if (class_data != NULL) { 1493 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1494 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1495 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1496 char c = descriptor[0]; 1497 if (c == 'L' || c == '[') { 1498 num_ref++; 1499 } else if (c == 'J' || c == 'D') { 1500 num_64++; 1501 } else { 1502 num_32++; 1503 } 1504 } 1505 } 1506 // start with generic class data 1507 size_t size = sizeof(mirror::Class); 1508 // follow with reference fields which must be contiguous at start 1509 size += (num_ref * sizeof(uint32_t)); 1510 // if there are 64-bit fields to add, make sure they are aligned 1511 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1512 if (num_32 != 0) { 1513 // use an available 32-bit field for padding 1514 num_32--; 1515 } 1516 size += sizeof(uint32_t); // either way, we are adding a word 1517 DCHECK_EQ(size, RoundUp(size, 8)); 1518 } 1519 // tack on any 64-bit fields now that alignment is assured 1520 size += (num_64 * sizeof(uint64_t)); 1521 // tack on any remaining 32-bit fields 1522 size += (num_32 * sizeof(uint32_t)); 1523 return size; 1524} 1525 1526const OatFile::OatClass* ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1527 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1528 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1529 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1530 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1531 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1532 &dex_location_checksum); 1533 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1534 const OatFile::OatClass* oat_class = oat_dex_file->GetOatClass(class_def_idx); 1535 CHECK(oat_class != NULL) << dex_file.GetLocation() << " " << class_def_idx; 1536 return oat_class; 1537} 1538 1539static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1540 uint32_t method_idx) { 1541 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1542 const byte* class_data = dex_file.GetClassData(class_def); 1543 CHECK(class_data != NULL); 1544 ClassDataItemIterator it(dex_file, class_data); 1545 // Skip fields 1546 while (it.HasNextStaticField()) { 1547 it.Next(); 1548 } 1549 while (it.HasNextInstanceField()) { 1550 it.Next(); 1551 } 1552 // Process methods 1553 size_t class_def_method_index = 0; 1554 while (it.HasNextDirectMethod()) { 1555 if (it.GetMemberIndex() == method_idx) { 1556 return class_def_method_index; 1557 } 1558 class_def_method_index++; 1559 it.Next(); 1560 } 1561 while (it.HasNextVirtualMethod()) { 1562 if (it.GetMemberIndex() == method_idx) { 1563 return class_def_method_index; 1564 } 1565 class_def_method_index++; 1566 it.Next(); 1567 } 1568 DCHECK(!it.HasNext()); 1569 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1570 return 0; 1571} 1572 1573const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1574 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1575 // method for direct methods (or virtual methods made direct). 1576 mirror::Class* declaring_class = method->GetDeclaringClass(); 1577 size_t oat_method_index; 1578 if (method->IsStatic() || method->IsDirect()) { 1579 // Simple case where the oat method index was stashed at load time. 1580 oat_method_index = method->GetMethodIndex(); 1581 } else { 1582 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1583 // by search for its position in the declared virtual methods. 1584 oat_method_index = declaring_class->NumDirectMethods(); 1585 size_t end = declaring_class->NumVirtualMethods(); 1586 bool found = false; 1587 for (size_t i = 0; i < end; i++) { 1588 if (declaring_class->GetVirtualMethod(i) == method) { 1589 found = true; 1590 break; 1591 } 1592 oat_method_index++; 1593 } 1594 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1595 } 1596 UniquePtr<const OatFile::OatClass> 1597 oat_class(GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1598 declaring_class->GetDexClassDefIndex())); 1599 CHECK(oat_class.get() != NULL); 1600 DCHECK_EQ(oat_method_index, 1601 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1602 method->GetDeclaringClass()->GetDexClassDefIndex(), 1603 method->GetDexMethodIndex())); 1604 1605 return oat_class->GetOatMethod(oat_method_index); 1606} 1607 1608// Special case to get oat code without overwriting a trampoline. 1609const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1610 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1611 if (method->IsProxyMethod()) { 1612 return GetQuickProxyInvokeHandler(); 1613 } 1614 const void* result = GetOatMethodFor(method).GetQuickCode(); 1615 if (result == nullptr) { 1616 if (method->IsPortableCompiled()) { 1617 // No code? Do we expect portable code? 1618 result = GetQuickToPortableBridge(); 1619 } else { 1620 // No code? You must mean to go into the interpreter. 1621 result = GetQuickToInterpreterBridge(); 1622 } 1623 } 1624 return result; 1625} 1626 1627const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1628 bool* have_portable_code) { 1629 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1630 *have_portable_code = false; 1631 if (method->IsProxyMethod()) { 1632 return GetPortableProxyInvokeHandler(); 1633 } 1634 const void* result = GetOatMethodFor(method).GetPortableCode(); 1635 if (result == nullptr) { 1636 if (GetOatMethodFor(method).GetQuickCode() == nullptr) { 1637 // No code? You must mean to go into the interpreter. 1638 result = GetPortableToInterpreterBridge(); 1639 } else { 1640 // No code? But there's quick code, so use a bridge. 1641 result = GetPortableToQuickBridge(); 1642 } 1643 } else { 1644 *have_portable_code = true; 1645 } 1646 return result; 1647} 1648 1649const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1650 uint32_t method_idx) { 1651 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1652 CHECK(oat_class.get() != nullptr); 1653 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1654 return oat_class->GetOatMethod(oat_method_idx).GetQuickCode(); 1655} 1656 1657const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1658 uint32_t method_idx) { 1659 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1660 CHECK(oat_class.get() != nullptr); 1661 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1662 return oat_class->GetOatMethod(oat_method_idx).GetPortableCode(); 1663} 1664 1665// Returns true if the method must run with interpreter, false otherwise. 1666static bool NeedsInterpreter(mirror::ArtMethod* method, const void* quick_code, 1667 const void* portable_code) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1668 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1669 // No code: need interpreter. 1670 DCHECK(!method->IsNative()); 1671 return true; 1672 } 1673#ifdef ART_SEA_IR_MODE 1674 ScopedObjectAccess soa(Thread::Current()); 1675 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1676 LOG(INFO) << "Found " << PrettyMethod(method); 1677 return false; 1678 } 1679#endif 1680 // If interpreter mode is enabled, every method (except native and proxy) must 1681 // be run with interpreter. 1682 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1683 !method->IsNative() && !method->IsProxyMethod(); 1684} 1685 1686void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1687 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1688 if (klass->NumDirectMethods() == 0) { 1689 return; // No direct methods => no static methods. 1690 } 1691 Runtime* runtime = Runtime::Current(); 1692 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1693 return; // OAT file unavailable. 1694 } 1695 ClassHelper kh(klass); 1696 const DexFile& dex_file = kh.GetDexFile(); 1697 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 1698 CHECK(dex_class_def != nullptr); 1699 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1700 // There should always be class data if there were direct methods. 1701 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1702 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1703 CHECK(oat_class.get() != nullptr); 1704 ClassDataItemIterator it(dex_file, class_data); 1705 // Skip fields 1706 while (it.HasNextStaticField()) { 1707 it.Next(); 1708 } 1709 while (it.HasNextInstanceField()) { 1710 it.Next(); 1711 } 1712 // Link the code of methods skipped by LinkCode. 1713 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1714 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1715 if (!method->IsStatic()) { 1716 // Only update static methods. 1717 continue; 1718 } 1719 const void* portable_code = oat_class->GetOatMethod(method_index).GetPortableCode(); 1720 const void* quick_code = oat_class->GetOatMethod(method_index).GetQuickCode(); 1721 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1722 bool have_portable_code = false; 1723 if (enter_interpreter) { 1724 // Use interpreter entry point. 1725 portable_code = GetPortableToInterpreterBridge(); 1726 quick_code = GetQuickToInterpreterBridge(); 1727 } else { 1728 if (portable_code == nullptr) { 1729 portable_code = GetPortableToQuickBridge(); 1730 } else { 1731 have_portable_code = true; 1732 } 1733 if (quick_code == nullptr) { 1734 quick_code = GetQuickToPortableBridge(); 1735 } 1736 } 1737 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1738 have_portable_code); 1739 } 1740 // Ignore virtual methods on the iterator. 1741} 1742 1743static void LinkCode(const SirtRef<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class, 1744 uint32_t method_index) 1745 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1746 // Method shouldn't have already been linked. 1747 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1748 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1749 // Every kind of method should at least get an invoke stub from the oat_method. 1750 // non-abstract methods also get their code pointers. 1751 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1752 oat_method.LinkMethod(method.get()); 1753 1754 // Install entry point from interpreter. 1755 Runtime* runtime = Runtime::Current(); 1756 bool enter_interpreter = NeedsInterpreter(method.get(), 1757 method->GetEntryPointFromQuickCompiledCode(), 1758 method->GetEntryPointFromPortableCompiledCode()); 1759 if (enter_interpreter) { 1760 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1761 } else { 1762 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1763 } 1764 1765 if (method->IsAbstract()) { 1766 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1767 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1768 return; 1769 } 1770 1771 bool have_portable_code = false; 1772 if (method->IsStatic() && !method->IsConstructor()) { 1773 // For static methods excluding the class initializer, install the trampoline. 1774 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1775 // after initializing class (see ClassLinker::InitializeClass method). 1776 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline(runtime->GetClassLinker())); 1777 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline(runtime->GetClassLinker())); 1778 } else if (enter_interpreter) { 1779 // Set entry point from compiled code if there's no code or in interpreter only mode. 1780 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1781 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1782 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1783 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1784 have_portable_code = true; 1785 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1786 } else { 1787 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1788 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1789 } 1790 1791 if (method->IsNative()) { 1792 // Unregistering restores the dlsym lookup stub. 1793 method->UnregisterNative(Thread::Current()); 1794 } 1795 1796 // Allow instrumentation its chance to hijack code. 1797 runtime->GetInstrumentation()->UpdateMethodsCode(method.get(), 1798 method->GetEntryPointFromQuickCompiledCode(), 1799 method->GetEntryPointFromPortableCompiledCode(), 1800 have_portable_code); 1801} 1802 1803void ClassLinker::LoadClass(const DexFile& dex_file, 1804 const DexFile::ClassDef& dex_class_def, 1805 const SirtRef<mirror::Class>& klass, 1806 mirror::ClassLoader* class_loader) { 1807 CHECK(klass.get() != NULL); 1808 CHECK(klass->GetDexCache() != NULL); 1809 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1810 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1811 CHECK(descriptor != NULL); 1812 1813 klass->SetClass(GetClassRoot(kJavaLangClass)); 1814 uint32_t access_flags = dex_class_def.access_flags_; 1815 // Make sure that none of our runtime-only flags are set. 1816 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1817 klass->SetAccessFlags(access_flags); 1818 klass->SetClassLoader(class_loader); 1819 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1820 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1821 1822 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1823 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1824 1825 // Load fields fields. 1826 const byte* class_data = dex_file.GetClassData(dex_class_def); 1827 if (class_data == NULL) { 1828 return; // no fields or methods - for example a marker interface 1829 } 1830 ClassDataItemIterator it(dex_file, class_data); 1831 Thread* self = Thread::Current(); 1832 if (it.NumStaticFields() != 0) { 1833 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1834 if (UNLIKELY(statics == NULL)) { 1835 CHECK(self->IsExceptionPending()); // OOME. 1836 return; 1837 } 1838 klass->SetSFields(statics); 1839 } 1840 if (it.NumInstanceFields() != 0) { 1841 mirror::ObjectArray<mirror::ArtField>* fields = 1842 AllocArtFieldArray(self, it.NumInstanceFields()); 1843 if (UNLIKELY(fields == NULL)) { 1844 CHECK(self->IsExceptionPending()); // OOME. 1845 return; 1846 } 1847 klass->SetIFields(fields); 1848 } 1849 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1850 SirtRef<mirror::ArtField> sfield(self, AllocArtField(self)); 1851 if (UNLIKELY(sfield.get() == NULL)) { 1852 CHECK(self->IsExceptionPending()); // OOME. 1853 return; 1854 } 1855 klass->SetStaticField(i, sfield.get()); 1856 LoadField(dex_file, it, klass, sfield); 1857 } 1858 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1859 SirtRef<mirror::ArtField> ifield(self, AllocArtField(self)); 1860 if (UNLIKELY(ifield.get() == NULL)) { 1861 CHECK(self->IsExceptionPending()); // OOME. 1862 return; 1863 } 1864 klass->SetInstanceField(i, ifield.get()); 1865 LoadField(dex_file, it, klass, ifield); 1866 } 1867 1868 UniquePtr<const OatFile::OatClass> oat_class; 1869 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1870 oat_class.reset(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1871 } 1872 1873 // Load methods. 1874 if (it.NumDirectMethods() != 0) { 1875 // TODO: append direct methods to class object 1876 mirror::ObjectArray<mirror::ArtMethod>* directs = 1877 AllocArtMethodArray(self, it.NumDirectMethods()); 1878 if (UNLIKELY(directs == NULL)) { 1879 CHECK(self->IsExceptionPending()); // OOME. 1880 return; 1881 } 1882 klass->SetDirectMethods(directs); 1883 } 1884 if (it.NumVirtualMethods() != 0) { 1885 // TODO: append direct methods to class object 1886 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1887 AllocArtMethodArray(self, it.NumVirtualMethods()); 1888 if (UNLIKELY(virtuals == NULL)) { 1889 CHECK(self->IsExceptionPending()); // OOME. 1890 return; 1891 } 1892 klass->SetVirtualMethods(virtuals); 1893 } 1894 size_t class_def_method_index = 0; 1895 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1896 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1897 if (UNLIKELY(method.get() == NULL)) { 1898 CHECK(self->IsExceptionPending()); // OOME. 1899 return; 1900 } 1901 klass->SetDirectMethod(i, method.get()); 1902 if (oat_class.get() != NULL) { 1903 LinkCode(method, oat_class.get(), class_def_method_index); 1904 } 1905 method->SetMethodIndex(class_def_method_index); 1906 class_def_method_index++; 1907 } 1908 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1909 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1910 if (UNLIKELY(method.get() == NULL)) { 1911 CHECK(self->IsExceptionPending()); // OOME. 1912 return; 1913 } 1914 klass->SetVirtualMethod(i, method.get()); 1915 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1916 if (oat_class.get() != NULL) { 1917 LinkCode(method, oat_class.get(), class_def_method_index); 1918 } 1919 class_def_method_index++; 1920 } 1921 DCHECK(!it.HasNext()); 1922} 1923 1924void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1925 const SirtRef<mirror::Class>& klass, 1926 const SirtRef<mirror::ArtField>& dst) { 1927 uint32_t field_idx = it.GetMemberIndex(); 1928 dst->SetDexFieldIndex(field_idx); 1929 dst->SetDeclaringClass(klass.get()); 1930 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1931} 1932 1933mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1934 const ClassDataItemIterator& it, 1935 const SirtRef<mirror::Class>& klass) { 1936 uint32_t dex_method_idx = it.GetMemberIndex(); 1937 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1938 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 1939 1940 mirror::ArtMethod* dst = AllocArtMethod(self); 1941 if (UNLIKELY(dst == NULL)) { 1942 CHECK(self->IsExceptionPending()); // OOME. 1943 return NULL; 1944 } 1945 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 1946 1947 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 1948 dst->SetDexMethodIndex(dex_method_idx); 1949 dst->SetDeclaringClass(klass.get()); 1950 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 1951 1952 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 1953 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 1954 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 1955 1956 uint32_t access_flags = it.GetMemberAccessFlags(); 1957 1958 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 1959 // Set finalizable flag on declaring class. 1960 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 1961 // Void return type. 1962 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 1963 klass->SetFinalizable(); 1964 } else { 1965 ClassHelper kh(klass.get()); 1966 const char* klass_descriptor = kh.GetDescriptor(); 1967 // The Enum class declares a "final" finalize() method to prevent subclasses from 1968 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 1969 // subclasses, so we exclude it here. 1970 // We also want to avoid setting the flag on Object, where we know that finalize() is 1971 // empty. 1972 if ((strcmp("Ljava/lang/Object;", klass_descriptor) != 0) && 1973 (strcmp("Ljava/lang/Enum;", klass_descriptor) != 0)) { 1974 klass->SetFinalizable(); 1975 } 1976 } 1977 } 1978 } else if (method_name[0] == '<') { 1979 // Fix broken access flags for initializers. Bug 11157540. 1980 bool is_init = (strcmp("<init>", method_name) == 0); 1981 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 1982 if (UNLIKELY(!is_init && !is_clinit)) { 1983 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 1984 } else { 1985 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 1986 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 1987 << PrettyDescriptor(klass.get()) << " in dex file " << dex_file.GetLocation(); 1988 access_flags |= kAccConstructor; 1989 } 1990 } 1991 } 1992 dst->SetAccessFlags(access_flags); 1993 1994 self->EndAssertNoThreadSuspension(old_cause); 1995 return dst; 1996} 1997 1998void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 1999 Thread* self = Thread::Current(); 2000 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 2001 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2002 AppendToBootClassPath(dex_file, dex_cache); 2003} 2004 2005void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2006 const SirtRef<mirror::DexCache>& dex_cache) { 2007 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 2008 boot_class_path_.push_back(&dex_file); 2009 RegisterDexFile(dex_file, dex_cache); 2010} 2011 2012bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 2013 dex_lock_.AssertSharedHeld(Thread::Current()); 2014 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2015 if (dex_caches_[i]->GetDexFile() == &dex_file) { 2016 return true; 2017 } 2018 } 2019 return false; 2020} 2021 2022bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 2023 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2024 return IsDexFileRegisteredLocked(dex_file); 2025} 2026 2027void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2028 const SirtRef<mirror::DexCache>& dex_cache) { 2029 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2030 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 2031 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2032 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2033 dex_caches_.push_back(dex_cache.get()); 2034 dex_cache->SetDexFile(&dex_file); 2035 dex_caches_dirty_ = true; 2036} 2037 2038void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2039 Thread* self = Thread::Current(); 2040 { 2041 ReaderMutexLock mu(self, dex_lock_); 2042 if (IsDexFileRegisteredLocked(dex_file)) { 2043 return; 2044 } 2045 } 2046 // Don't alloc while holding the lock, since allocation may need to 2047 // suspend all threads and another thread may need the dex_lock_ to 2048 // get to a suspend point. 2049 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 2050 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2051 { 2052 WriterMutexLock mu(self, dex_lock_); 2053 if (IsDexFileRegisteredLocked(dex_file)) { 2054 return; 2055 } 2056 RegisterDexFileLocked(dex_file, dex_cache); 2057 } 2058} 2059 2060void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2061 const SirtRef<mirror::DexCache>& dex_cache) { 2062 WriterMutexLock mu(Thread::Current(), dex_lock_); 2063 RegisterDexFileLocked(dex_file, dex_cache); 2064} 2065 2066mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 2067 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2068 // Search assuming unique-ness of dex file. 2069 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2070 mirror::DexCache* dex_cache = dex_caches_[i]; 2071 if (dex_cache->GetDexFile() == &dex_file) { 2072 return dex_cache; 2073 } 2074 } 2075 // Search matching by location name. 2076 std::string location(dex_file.GetLocation()); 2077 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2078 mirror::DexCache* dex_cache = dex_caches_[i]; 2079 if (dex_cache->GetDexFile()->GetLocation() == location) { 2080 return dex_cache; 2081 } 2082 } 2083 // Failure, dump diagnostic and abort. 2084 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2085 mirror::DexCache* dex_cache = dex_caches_[i]; 2086 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2087 } 2088 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2089 return NULL; 2090} 2091 2092void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 2093 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2094 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2095 dex_caches_[i]->Fixup(resolution_method); 2096 } 2097} 2098 2099mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2100 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2101 if (UNLIKELY(klass == NULL)) { 2102 return NULL; 2103 } 2104 return InitializePrimitiveClass(klass, type); 2105} 2106 2107mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2108 Primitive::Type type) { 2109 CHECK(primitive_class != NULL); 2110 // Must hold lock on object when initializing. 2111 Thread* self = Thread::Current(); 2112 SirtRef<mirror::Class> sirt_class(self, primitive_class); 2113 ObjectLock<mirror::Class> lock(self, &sirt_class); 2114 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2115 primitive_class->SetPrimitiveType(type); 2116 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2117 const char* descriptor = Primitive::Descriptor(type); 2118 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2119 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2120 return primitive_class; 2121} 2122 2123// Create an array class (i.e. the class object for the array, not the 2124// array itself). "descriptor" looks like "[C" or "[[[[B" or 2125// "[Ljava/lang/String;". 2126// 2127// If "descriptor" refers to an array of primitives, look up the 2128// primitive type's internally-generated class object. 2129// 2130// "class_loader" is the class loader of the class that's referring to 2131// us. It's used to ensure that we're looking for the element type in 2132// the right context. It does NOT become the class loader for the 2133// array class; that always comes from the base element class. 2134// 2135// Returns NULL with an exception raised on failure. 2136mirror::Class* ClassLinker::CreateArrayClass(const char* descriptor, 2137 const SirtRef<mirror::ClassLoader>& class_loader) { 2138 // Identify the underlying component type 2139 CHECK_EQ('[', descriptor[0]); 2140 Thread* self = Thread::Current(); 2141 SirtRef<mirror::Class> component_type(self, FindClass(descriptor + 1, class_loader)); 2142 if (component_type.get() == nullptr) { 2143 DCHECK(self->IsExceptionPending()); 2144 return nullptr; 2145 } 2146 2147 // See if the component type is already loaded. Array classes are 2148 // always associated with the class loader of their underlying 2149 // element type -- an array of Strings goes with the loader for 2150 // java/lang/String -- so we need to look for it there. (The 2151 // caller should have checked for the existence of the class 2152 // before calling here, but they did so with *their* class loader, 2153 // not the component type's loader.) 2154 // 2155 // If we find it, the caller adds "loader" to the class' initiating 2156 // loader list, which should prevent us from going through this again. 2157 // 2158 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2159 // are the same, because our caller (FindClass) just did the 2160 // lookup. (Even if we get this wrong we still have correct behavior, 2161 // because we effectively do this lookup again when we add the new 2162 // class to the hash table --- necessary because of possible races with 2163 // other threads.) 2164 if (class_loader.get() != component_type->GetClassLoader()) { 2165 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2166 if (new_class != NULL) { 2167 return new_class; 2168 } 2169 } 2170 2171 // Fill out the fields in the Class. 2172 // 2173 // It is possible to execute some methods against arrays, because 2174 // all arrays are subclasses of java_lang_Object_, so we need to set 2175 // up a vtable. We can just point at the one in java_lang_Object_. 2176 // 2177 // Array classes are simple enough that we don't need to do a full 2178 // link step. 2179 SirtRef<mirror::Class> new_class(self, NULL); 2180 if (UNLIKELY(!init_done_)) { 2181 // Classes that were hand created, ie not by FindSystemClass 2182 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2183 new_class.reset(GetClassRoot(kClassArrayClass)); 2184 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2185 new_class.reset(GetClassRoot(kObjectArrayClass)); 2186 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2187 new_class.reset(GetClassRoot(kJavaLangStringArrayClass)); 2188 } else if (strcmp(descriptor, 2189 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2190 new_class.reset(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2191 } else if (strcmp(descriptor, 2192 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2193 new_class.reset(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2194 } else if (strcmp(descriptor, "[C") == 0) { 2195 new_class.reset(GetClassRoot(kCharArrayClass)); 2196 } else if (strcmp(descriptor, "[I") == 0) { 2197 new_class.reset(GetClassRoot(kIntArrayClass)); 2198 } 2199 } 2200 if (new_class.get() == nullptr) { 2201 new_class.reset(AllocClass(self, sizeof(mirror::Class))); 2202 if (new_class.get() == nullptr) { 2203 return nullptr; 2204 } 2205 new_class->SetComponentType(component_type.get()); 2206 } 2207 ObjectLock<mirror::Class> lock(self, &new_class); // Must hold lock on object when initializing. 2208 DCHECK(new_class->GetComponentType() != NULL); 2209 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2210 new_class->SetSuperClass(java_lang_Object); 2211 new_class->SetVTable(java_lang_Object->GetVTable()); 2212 new_class->SetPrimitiveType(Primitive::kPrimNot); 2213 new_class->SetClassLoader(component_type->GetClassLoader()); 2214 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2215 // don't need to set new_class->SetObjectSize(..) 2216 // because Object::SizeOf delegates to Array::SizeOf 2217 2218 2219 // All arrays have java/lang/Cloneable and java/io/Serializable as 2220 // interfaces. We need to set that up here, so that stuff like 2221 // "instanceof" works right. 2222 // 2223 // Note: The GC could run during the call to FindSystemClass, 2224 // so we need to make sure the class object is GC-valid while we're in 2225 // there. Do this by clearing the interface list so the GC will just 2226 // think that the entries are null. 2227 2228 2229 // Use the single, global copies of "interfaces" and "iftable" 2230 // (remember not to free them for arrays). 2231 CHECK(array_iftable_ != nullptr); 2232 new_class->SetIfTable(array_iftable_); 2233 2234 // Inherit access flags from the component type. 2235 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2236 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2237 access_flags &= kAccJavaFlagsMask; 2238 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2239 // and remove "interface". 2240 access_flags |= kAccAbstract | kAccFinal; 2241 access_flags &= ~kAccInterface; 2242 2243 new_class->SetAccessFlags(access_flags); 2244 2245 mirror::Class* existing = InsertClass(descriptor, new_class.get(), Hash(descriptor)); 2246 if (existing == nullptr) { 2247 return new_class.get(); 2248 } 2249 // Another thread must have loaded the class after we 2250 // started but before we finished. Abandon what we've 2251 // done. 2252 // 2253 // (Yes, this happens.) 2254 2255 return existing; 2256} 2257 2258mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2259 switch (Primitive::GetType(type)) { 2260 case Primitive::kPrimByte: 2261 return GetClassRoot(kPrimitiveByte); 2262 case Primitive::kPrimChar: 2263 return GetClassRoot(kPrimitiveChar); 2264 case Primitive::kPrimDouble: 2265 return GetClassRoot(kPrimitiveDouble); 2266 case Primitive::kPrimFloat: 2267 return GetClassRoot(kPrimitiveFloat); 2268 case Primitive::kPrimInt: 2269 return GetClassRoot(kPrimitiveInt); 2270 case Primitive::kPrimLong: 2271 return GetClassRoot(kPrimitiveLong); 2272 case Primitive::kPrimShort: 2273 return GetClassRoot(kPrimitiveShort); 2274 case Primitive::kPrimBoolean: 2275 return GetClassRoot(kPrimitiveBoolean); 2276 case Primitive::kPrimVoid: 2277 return GetClassRoot(kPrimitiveVoid); 2278 case Primitive::kPrimNot: 2279 break; 2280 } 2281 std::string printable_type(PrintableChar(type)); 2282 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2283 return NULL; 2284} 2285 2286mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2287 size_t hash) { 2288 if (VLOG_IS_ON(class_linker)) { 2289 mirror::DexCache* dex_cache = klass->GetDexCache(); 2290 std::string source; 2291 if (dex_cache != NULL) { 2292 source += " from "; 2293 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2294 } 2295 LOG(INFO) << "Loaded class " << descriptor << source; 2296 } 2297 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2298 mirror::Class* existing = 2299 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2300 if (existing != NULL) { 2301 return existing; 2302 } 2303 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2304 // Check a class loaded with the system class loader matches one in the image if the class 2305 // is in the image. 2306 existing = LookupClassFromImage(descriptor); 2307 if (existing != NULL) { 2308 CHECK(klass == existing); 2309 } 2310 } 2311 Runtime::Current()->GetHeap()->VerifyObject(klass); 2312 class_table_.insert(std::make_pair(hash, klass)); 2313 class_table_dirty_ = true; 2314 return NULL; 2315} 2316 2317bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2318 size_t hash = Hash(descriptor); 2319 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2320 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2321 ++it) { 2322 mirror::Class* klass = it->second; 2323 ClassHelper kh(klass); 2324 if ((klass->GetClassLoader() == class_loader) && 2325 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2326 class_table_.erase(it); 2327 return true; 2328 } 2329 } 2330 return false; 2331} 2332 2333mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2334 const mirror::ClassLoader* class_loader) { 2335 size_t hash = Hash(descriptor); 2336 { 2337 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2338 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2339 if (result != NULL) { 2340 return result; 2341 } 2342 } 2343 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2344 return NULL; 2345 } else { 2346 // Lookup failed but need to search dex_caches_. 2347 mirror::Class* result = LookupClassFromImage(descriptor); 2348 if (result != NULL) { 2349 InsertClass(descriptor, result, hash); 2350 } else { 2351 // Searching the image dex files/caches failed, we don't want to get into this situation 2352 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2353 // classes into the class table. 2354 const int32_t kMaxFailedDexCacheLookups = 1000; 2355 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2356 MoveImageClassesToClassTable(); 2357 } 2358 } 2359 return result; 2360 } 2361} 2362 2363mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2364 const mirror::ClassLoader* class_loader, 2365 size_t hash) { 2366 auto end = class_table_.end(); 2367 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2368 mirror::Class* klass = it->second; 2369 ClassHelper kh(klass); 2370 if ((klass->GetClassLoader() == class_loader) && 2371 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2372 if (kIsDebugBuild) { 2373 // Check for duplicates in the table. 2374 for (++it; it != end && it->first == hash; ++it) { 2375 mirror::Class* klass2 = it->second; 2376 ClassHelper kh(klass2); 2377 CHECK(!((klass2->GetClassLoader() == class_loader) && 2378 (strcmp(descriptor, kh.GetDescriptor()) == 0))) 2379 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2380 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2381 } 2382 } 2383 return klass; 2384 } 2385 } 2386 return NULL; 2387} 2388 2389static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2390 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2391 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2392 CHECK(image != NULL); 2393 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2394 return root->AsObjectArray<mirror::DexCache>(); 2395} 2396 2397void ClassLinker::MoveImageClassesToClassTable() { 2398 Thread* self = Thread::Current(); 2399 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2400 if (!dex_cache_image_class_lookup_required_) { 2401 return; // All dex cache classes are already in the class table. 2402 } 2403 const char* old_no_suspend_cause = 2404 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2405 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2406 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2407 mirror::DexCache* dex_cache = dex_caches->Get(i); 2408 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2409 for (int32_t j = 0; j < types->GetLength(); j++) { 2410 mirror::Class* klass = types->Get(j); 2411 if (klass != NULL) { 2412 ClassHelper kh(klass); 2413 DCHECK(klass->GetClassLoader() == NULL); 2414 const char* descriptor = kh.GetDescriptor(); 2415 size_t hash = Hash(descriptor); 2416 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 2417 if (existing != NULL) { 2418 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2419 << PrettyClassAndClassLoader(klass); 2420 } else { 2421 class_table_.insert(std::make_pair(hash, klass)); 2422 } 2423 } 2424 } 2425 } 2426 class_table_dirty_ = true; 2427 dex_cache_image_class_lookup_required_ = false; 2428 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2429} 2430 2431mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2432 Thread* self = Thread::Current(); 2433 const char* old_no_suspend_cause = 2434 self->StartAssertNoThreadSuspension("Image class lookup"); 2435 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2436 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2437 mirror::DexCache* dex_cache = dex_caches->Get(i); 2438 const DexFile* dex_file = dex_cache->GetDexFile(); 2439 // Try binary searching the string/type index. 2440 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2441 if (string_id != NULL) { 2442 const DexFile::TypeId* type_id = 2443 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2444 if (type_id != NULL) { 2445 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2446 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2447 if (klass != NULL) { 2448 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2449 return klass; 2450 } 2451 } 2452 } 2453 } 2454 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2455 return NULL; 2456} 2457 2458void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2459 result.clear(); 2460 if (dex_cache_image_class_lookup_required_) { 2461 MoveImageClassesToClassTable(); 2462 } 2463 size_t hash = Hash(descriptor); 2464 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2465 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2466 it != end && it->first == hash; ++it) { 2467 mirror::Class* klass = it->second; 2468 ClassHelper kh(klass); 2469 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2470 result.push_back(klass); 2471 } 2472 } 2473} 2474 2475void ClassLinker::VerifyClass(const SirtRef<mirror::Class>& klass) { 2476 // TODO: assert that the monitor on the Class is held 2477 Thread* self = Thread::Current(); 2478 ObjectLock<mirror::Class> lock(self, &klass); 2479 2480 // Don't attempt to re-verify if already sufficiently verified. 2481 if (klass->IsVerified() || 2482 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2483 return; 2484 } 2485 2486 // The class might already be erroneous, for example at compile time if we attempted to verify 2487 // this class as a parent to another. 2488 if (klass->IsErroneous()) { 2489 ThrowEarlierClassFailure(klass.get()); 2490 return; 2491 } 2492 2493 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2494 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2495 } else { 2496 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2497 << PrettyClass(klass.get()); 2498 CHECK(!Runtime::Current()->IsCompiler()); 2499 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2500 } 2501 2502 // Verify super class. 2503 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 2504 if (super.get() != NULL) { 2505 // Acquire lock to prevent races on verifying the super class. 2506 ObjectLock<mirror::Class> lock(self, &super); 2507 2508 if (!super->IsVerified() && !super->IsErroneous()) { 2509 VerifyClass(super); 2510 } 2511 if (!super->IsCompileTimeVerified()) { 2512 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2513 PrettyDescriptor(klass.get()).c_str(), 2514 PrettyDescriptor(super.get()).c_str())); 2515 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2516 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 2517 if (cause.get() != nullptr) { 2518 self->ClearException(); 2519 } 2520 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2521 if (cause.get() != nullptr) { 2522 self->GetException(nullptr)->SetCause(cause.get()); 2523 } 2524 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2525 if (Runtime::Current()->IsCompiler()) { 2526 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2527 } 2528 klass->SetStatus(mirror::Class::kStatusError, self); 2529 return; 2530 } 2531 } 2532 2533 // Try to use verification information from the oat file, otherwise do runtime verification. 2534 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2535 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2536 bool preverified = VerifyClassUsingOatFile(dex_file, klass.get(), oat_file_class_status); 2537 if (oat_file_class_status == mirror::Class::kStatusError) { 2538 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2539 << PrettyDescriptor(klass.get()) << " in " 2540 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2541 ThrowVerifyError(klass.get(), "Rejecting class %s because it failed compile-time verification", 2542 PrettyDescriptor(klass.get()).c_str()); 2543 klass->SetStatus(mirror::Class::kStatusError, self); 2544 return; 2545 } 2546 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2547 std::string error_msg; 2548 if (!preverified) { 2549 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.get(), 2550 Runtime::Current()->IsCompiler(), 2551 &error_msg); 2552 } 2553 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2554 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2555 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.get()) 2556 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2557 << " because: " << error_msg; 2558 } 2559 self->AssertNoPendingException(); 2560 // Make sure all classes referenced by catch blocks are resolved. 2561 ResolveClassExceptionHandlerTypes(dex_file, klass); 2562 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2563 // Even though there were no verifier failures we need to respect whether the super-class 2564 // was verified or requiring runtime reverification. 2565 if (super.get() == NULL || super->IsVerified()) { 2566 klass->SetStatus(mirror::Class::kStatusVerified, self); 2567 } else { 2568 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2569 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2570 // Pretend a soft failure occured so that we don't consider the class verified below. 2571 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2572 } 2573 } else { 2574 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2575 // Soft failures at compile time should be retried at runtime. Soft 2576 // failures at runtime will be handled by slow paths in the generated 2577 // code. Set status accordingly. 2578 if (Runtime::Current()->IsCompiler()) { 2579 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2580 } else { 2581 klass->SetStatus(mirror::Class::kStatusVerified, self); 2582 } 2583 } 2584 } else { 2585 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.get()) 2586 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2587 << " because: " << error_msg; 2588 self->AssertNoPendingException(); 2589 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2590 klass->SetStatus(mirror::Class::kStatusError, self); 2591 } 2592 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2593 // Class is verified so we don't need to do any access check on its methods. 2594 // Let the interpreter know it by setting the kAccPreverified flag onto each 2595 // method. 2596 // Note: we're going here during compilation and at runtime. When we set the 2597 // kAccPreverified flag when compiling image classes, the flag is recorded 2598 // in the image and is set when loading the image. 2599 klass->SetPreverifiedFlagOnAllMethods(); 2600 } 2601} 2602 2603bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2604 mirror::Class::Status& oat_file_class_status) { 2605 // If we're compiling, we can only verify the class using the oat file if 2606 // we are not compiling the image or if the class we're verifying is not part of 2607 // the app. In other words, we will only check for preverification of bootclasspath 2608 // classes. 2609 if (Runtime::Current()->IsCompiler()) { 2610 // Are we compiling the bootclasspath? 2611 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2612 return false; 2613 } 2614 // We are compiling an app (not the image). 2615 2616 // Is this an app class? (I.e. not a bootclasspath class) 2617 if (klass->GetClassLoader() != NULL) { 2618 return false; 2619 } 2620 } 2621 2622 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2623 // Make this work with gtests, which do not set up the image properly. 2624 // TODO: we should clean up gtests to set up the image path properly. 2625 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2626 return false; 2627 } 2628 2629 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2630 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2631 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2632 &dex_location_checksum); 2633 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2634 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2635 UniquePtr<const OatFile::OatClass> oat_class(oat_dex_file->GetOatClass(class_def_index)); 2636 CHECK(oat_class.get() != NULL) 2637 << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2638 << ClassHelper(klass).GetDescriptor(); 2639 oat_file_class_status = oat_class->GetStatus(); 2640 if (oat_file_class_status == mirror::Class::kStatusVerified || 2641 oat_file_class_status == mirror::Class::kStatusInitialized) { 2642 return true; 2643 } 2644 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2645 // Compile time verification failed with a soft error. Compile time verification can fail 2646 // because we have incomplete type information. Consider the following: 2647 // class ... { 2648 // Foo x; 2649 // .... () { 2650 // if (...) { 2651 // v1 gets assigned a type of resolved class Foo 2652 // } else { 2653 // v1 gets assigned a type of unresolved class Bar 2654 // } 2655 // iput x = v1 2656 // } } 2657 // when we merge v1 following the if-the-else it results in Conflict 2658 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2659 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2660 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2661 // at compile time). 2662 return false; 2663 } 2664 if (oat_file_class_status == mirror::Class::kStatusError) { 2665 // Compile time verification failed with a hard error. This is caused by invalid instructions 2666 // in the class. These errors are unrecoverable. 2667 return false; 2668 } 2669 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2670 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2671 // not loading the class. 2672 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2673 // isn't a problem and this case shouldn't occur 2674 return false; 2675 } 2676 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2677 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2678 << ClassHelper(klass).GetDescriptor(); 2679 2680 return false; 2681} 2682 2683void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2684 const SirtRef<mirror::Class>& klass) { 2685 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2686 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2687 } 2688 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2689 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2690 } 2691} 2692 2693void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2694 mirror::ArtMethod* method) { 2695 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2696 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2697 if (code_item == NULL) { 2698 return; // native or abstract method 2699 } 2700 if (code_item->tries_size_ == 0) { 2701 return; // nothing to process 2702 } 2703 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2704 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2705 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2706 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2707 CatchHandlerIterator iterator(handlers_ptr); 2708 for (; iterator.HasNext(); iterator.Next()) { 2709 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2710 // unresolved exception types will be ignored by exception delivery 2711 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2712 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2713 if (exception_type == NULL) { 2714 DCHECK(Thread::Current()->IsExceptionPending()); 2715 Thread::Current()->ClearException(); 2716 } 2717 } 2718 } 2719 handlers_ptr = iterator.EndDataPointer(); 2720 } 2721} 2722 2723static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2724static void CheckProxyMethod(mirror::ArtMethod* method, 2725 SirtRef<mirror::ArtMethod>& prototype); 2726 2727mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccess& soa, jstring name, 2728 jobjectArray interfaces, jobject loader, 2729 jobjectArray methods, jobjectArray throws) { 2730 Thread* self = soa.Self(); 2731 SirtRef<mirror::Class> klass(self, AllocClass(self, GetClassRoot(kJavaLangClass), 2732 sizeof(mirror::SynthesizedProxyClass))); 2733 if (klass.get() == NULL) { 2734 CHECK(self->IsExceptionPending()); // OOME. 2735 return NULL; 2736 } 2737 DCHECK(klass->GetClass() != NULL); 2738 klass->SetObjectSize(sizeof(mirror::Proxy)); 2739 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2740 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2741 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2742 klass->SetName(soa.Decode<mirror::String*>(name)); 2743 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2744 klass->SetDexCache(proxy_class->GetDexCache()); 2745 klass->SetStatus(mirror::Class::kStatusIdx, self); 2746 2747 // Instance fields are inherited, but we add a couple of static fields... 2748 { 2749 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2750 if (UNLIKELY(sfields == NULL)) { 2751 CHECK(self->IsExceptionPending()); // OOME. 2752 return NULL; 2753 } 2754 klass->SetSFields(sfields); 2755 } 2756 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2757 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2758 SirtRef<mirror::ArtField> interfaces_sfield(self, AllocArtField(self)); 2759 if (UNLIKELY(interfaces_sfield.get() == NULL)) { 2760 CHECK(self->IsExceptionPending()); // OOME. 2761 return NULL; 2762 } 2763 klass->SetStaticField(0, interfaces_sfield.get()); 2764 interfaces_sfield->SetDexFieldIndex(0); 2765 interfaces_sfield->SetDeclaringClass(klass.get()); 2766 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2767 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2768 SirtRef<mirror::ArtField> throws_sfield(self, AllocArtField(self)); 2769 if (UNLIKELY(throws_sfield.get() == NULL)) { 2770 CHECK(self->IsExceptionPending()); // OOME. 2771 return NULL; 2772 } 2773 klass->SetStaticField(1, throws_sfield.get()); 2774 throws_sfield->SetDexFieldIndex(1); 2775 throws_sfield->SetDeclaringClass(klass.get()); 2776 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2777 2778 // Proxies have 1 direct method, the constructor 2779 { 2780 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 2781 if (UNLIKELY(directs == NULL)) { 2782 CHECK(self->IsExceptionPending()); // OOME. 2783 return NULL; 2784 } 2785 klass->SetDirectMethods(directs); 2786 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2787 if (UNLIKELY(constructor == NULL)) { 2788 CHECK(self->IsExceptionPending()); // OOME. 2789 return NULL; 2790 } 2791 klass->SetDirectMethod(0, constructor); 2792 } 2793 2794 // Create virtual method using specified prototypes. 2795 size_t num_virtual_methods = 2796 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 2797 { 2798 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, num_virtual_methods); 2799 if (UNLIKELY(virtuals == NULL)) { 2800 CHECK(self->IsExceptionPending()); // OOME. 2801 return NULL; 2802 } 2803 klass->SetVirtualMethods(virtuals); 2804 } 2805 for (size_t i = 0; i < num_virtual_methods; ++i) { 2806 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2807 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2808 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2809 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2810 if (UNLIKELY(clone == NULL)) { 2811 CHECK(self->IsExceptionPending()); // OOME. 2812 return NULL; 2813 } 2814 klass->SetVirtualMethod(i, clone); 2815 } 2816 2817 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2818 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Class is now effectively in the loaded state 2819 self->AssertNoPendingException(); 2820 2821 { 2822 ObjectLock<mirror::Class> lock(self, &klass); // Must hold lock on object when resolved. 2823 // Link the fields and virtual methods, creating vtable and iftables 2824 SirtRef<mirror::ObjectArray<mirror::Class> > sirt_interfaces( 2825 self, soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2826 if (!LinkClass(self, klass, sirt_interfaces)) { 2827 klass->SetStatus(mirror::Class::kStatusError, self); 2828 return nullptr; 2829 } 2830 2831 interfaces_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2832 throws_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2833 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2834 } 2835 2836 // sanity checks 2837 if (kIsDebugBuild) { 2838 CHECK(klass->GetIFields() == NULL); 2839 CheckProxyConstructor(klass->GetDirectMethod(0)); 2840 for (size_t i = 0; i < num_virtual_methods; ++i) { 2841 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2842 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2843 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2844 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2845 } 2846 2847 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 2848 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2849 decoded_name->ToModifiedUtf8().c_str())); 2850 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2851 2852 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2853 decoded_name->ToModifiedUtf8().c_str())); 2854 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2855 2856 mirror::SynthesizedProxyClass* synth_proxy_class = 2857 down_cast<mirror::SynthesizedProxyClass*>(klass.get()); 2858 CHECK_EQ(synth_proxy_class->GetInterfaces(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2859 CHECK_EQ(synth_proxy_class->GetThrows(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2860 } 2861 std::string descriptor(GetDescriptorForProxy(klass.get())); 2862 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.get(), Hash(descriptor.c_str())); 2863 CHECK(existing == nullptr); 2864 return klass.get(); 2865} 2866 2867std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 2868 DCHECK(proxy_class->IsProxyClass()); 2869 mirror::String* name = proxy_class->GetName(); 2870 DCHECK(name != NULL); 2871 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2872} 2873 2874mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 2875 mirror::ArtMethod* proxy_method) { 2876 DCHECK(proxy_class->IsProxyClass()); 2877 DCHECK(proxy_method->IsProxyMethod()); 2878 // Locate the dex cache of the original interface/Object 2879 mirror::DexCache* dex_cache = NULL; 2880 { 2881 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2882 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2883 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2884 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2885 dex_cache = dex_caches_[i]; 2886 break; 2887 } 2888 } 2889 } 2890 CHECK(dex_cache != NULL); 2891 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2892 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2893 CHECK(resolved_method != NULL); 2894 return resolved_method; 2895} 2896 2897 2898mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2899 const SirtRef<mirror::Class>& klass, 2900 mirror::Class* proxy_class) { 2901 // Create constructor for Proxy that must initialize h 2902 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2903 proxy_class->GetDirectMethods(); 2904 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2905 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2906 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2907 // code_ too) 2908 mirror::ArtMethod* constructor = 2909 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2910 if (constructor == NULL) { 2911 CHECK(self->IsExceptionPending()); // OOME. 2912 return NULL; 2913 } 2914 // Make this constructor public and fix the class to be our Proxy version 2915 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2916 constructor->SetDeclaringClass(klass.get()); 2917 return constructor; 2918} 2919 2920static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2921 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2922 CHECK(constructor->IsConstructor()); 2923 MethodHelper mh(constructor); 2924 CHECK_STREQ(mh.GetName(), "<init>"); 2925 CHECK_STREQ(mh.GetSignature().ToString().c_str(), "(Ljava/lang/reflect/InvocationHandler;)V"); 2926 DCHECK(constructor->IsPublic()); 2927} 2928 2929mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 2930 const SirtRef<mirror::Class>& klass, 2931 const SirtRef<mirror::ArtMethod>& prototype) { 2932 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2933 // prototype method 2934 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2935 prototype.get()); 2936 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2937 // as necessary 2938 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 2939 if (UNLIKELY(method == NULL)) { 2940 CHECK(self->IsExceptionPending()); // OOME. 2941 return NULL; 2942 } 2943 2944 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 2945 // the intersection of throw exceptions as defined in Proxy 2946 method->SetDeclaringClass(klass.get()); 2947 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 2948 2949 // At runtime the method looks like a reference and argument saving method, clone the code 2950 // related parameters from this method. 2951 mirror::ArtMethod* refs_and_args = 2952 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 2953 method->SetCoreSpillMask(refs_and_args->GetCoreSpillMask()); 2954 method->SetFpSpillMask(refs_and_args->GetFpSpillMask()); 2955 method->SetFrameSizeInBytes(refs_and_args->GetFrameSizeInBytes()); 2956 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 2957 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 2958 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2959 2960 return method; 2961} 2962 2963static void CheckProxyMethod(mirror::ArtMethod* method, 2964 SirtRef<mirror::ArtMethod>& prototype) 2965 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2966 // Basic sanity 2967 CHECK(!prototype->IsFinal()); 2968 CHECK(method->IsFinal()); 2969 CHECK(!method->IsAbstract()); 2970 2971 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 2972 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 2973 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 2974 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 2975 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 2976 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 2977 2978 MethodHelper mh(method); 2979 MethodHelper mh2(prototype.get()); 2980 CHECK_STREQ(mh.GetName(), mh2.GetName()); 2981 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 2982 // More complex sanity - via dex cache 2983 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 2984} 2985 2986static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 2987 bool can_init_parents) 2988 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2989 if (can_init_statics && can_init_parents) { 2990 return true; 2991 } 2992 if (!can_init_statics) { 2993 // Check if there's a class initializer. 2994 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 2995 if (clinit != NULL) { 2996 return false; 2997 } 2998 // Check if there are encoded static values needing initialization. 2999 if (klass->NumStaticFields() != 0) { 3000 ClassHelper kh(klass); 3001 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3002 DCHECK(dex_class_def != NULL); 3003 if (dex_class_def->static_values_off_ != 0) { 3004 return false; 3005 } 3006 } 3007 } 3008 if (!klass->IsInterface() && klass->HasSuperClass()) { 3009 mirror::Class* super_class = klass->GetSuperClass(); 3010 if (!can_init_parents && !super_class->IsInitialized()) { 3011 return false; 3012 } else { 3013 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3014 return false; 3015 } 3016 } 3017 } 3018 return true; 3019} 3020 3021bool ClassLinker::IsInitialized() const { 3022 return init_done_; 3023} 3024 3025bool ClassLinker::InitializeClass(const SirtRef<mirror::Class>& klass, bool can_init_statics, 3026 bool can_init_parents) { 3027 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3028 3029 // Are we already initialized and therefore done? 3030 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3031 // an initialized class will never change its state. 3032 if (klass->IsInitialized()) { 3033 return true; 3034 } 3035 3036 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3037 if (!CanWeInitializeClass(klass.get(), can_init_statics, can_init_parents)) { 3038 return false; 3039 } 3040 3041 Thread* self = Thread::Current(); 3042 uint64_t t0; 3043 { 3044 ObjectLock<mirror::Class> lock(self, &klass); 3045 3046 // Re-check under the lock in case another thread initialized ahead of us. 3047 if (klass->IsInitialized()) { 3048 return true; 3049 } 3050 3051 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3052 if (klass->IsErroneous()) { 3053 ThrowEarlierClassFailure(klass.get()); 3054 return false; 3055 } 3056 3057 CHECK(klass->IsResolved()) << PrettyClass(klass.get()) << ": state=" << klass->GetStatus(); 3058 3059 if (!klass->IsVerified()) { 3060 VerifyClass(klass); 3061 if (!klass->IsVerified()) { 3062 // We failed to verify, expect either the klass to be erroneous or verification failed at 3063 // compile time. 3064 if (klass->IsErroneous()) { 3065 CHECK(self->IsExceptionPending()); 3066 } else { 3067 CHECK(Runtime::Current()->IsCompiler()); 3068 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3069 } 3070 return false; 3071 } 3072 } 3073 3074 // If the class is kStatusInitializing, either this thread is 3075 // initializing higher up the stack or another thread has beat us 3076 // to initializing and we need to wait. Either way, this 3077 // invocation of InitializeClass will not be responsible for 3078 // running <clinit> and will return. 3079 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3080 // We caught somebody else in the act; was it us? 3081 if (klass->GetClinitThreadId() == self->GetTid()) { 3082 // Yes. That's fine. Return so we can continue initializing. 3083 return true; 3084 } 3085 // No. That's fine. Wait for another thread to finish initializing. 3086 return WaitForInitializeClass(klass, self, lock); 3087 } 3088 3089 if (!ValidateSuperClassDescriptors(klass)) { 3090 klass->SetStatus(mirror::Class::kStatusError, self); 3091 return false; 3092 } 3093 3094 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.get()); 3095 3096 // From here out other threads may observe that we're initializing and so changes of state 3097 // require the a notification. 3098 klass->SetClinitThreadId(self->GetTid()); 3099 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3100 3101 t0 = NanoTime(); 3102 } 3103 3104 // Initialize super classes, must be done while initializing for the JLS. 3105 if (!klass->IsInterface() && klass->HasSuperClass()) { 3106 mirror::Class* super_class = klass->GetSuperClass(); 3107 if (!super_class->IsInitialized()) { 3108 CHECK(!super_class->IsInterface()); 3109 CHECK(can_init_parents); 3110 SirtRef<mirror::Class> sirt_super(self, super_class); 3111 bool super_initialized = InitializeClass(sirt_super, can_init_statics, true); 3112 if (!super_initialized) { 3113 // The super class was verified ahead of entering initializing, we should only be here if 3114 // the super class became erroneous due to initialization. 3115 CHECK(sirt_super->IsErroneous() && self->IsExceptionPending()) 3116 << "Super class initialization failed for " << PrettyDescriptor(sirt_super.get()) 3117 << " that has unexpected status " << sirt_super->GetStatus() 3118 << "\nPending exception:\n" 3119 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3120 ObjectLock<mirror::Class> lock(self, &klass); 3121 // Initialization failed because the super-class is erroneous. 3122 klass->SetStatus(mirror::Class::kStatusError, self); 3123 return false; 3124 } 3125 } 3126 } 3127 3128 if (klass->NumStaticFields() > 0) { 3129 ClassHelper kh(klass.get()); 3130 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3131 CHECK(dex_class_def != NULL); 3132 const DexFile& dex_file = kh.GetDexFile(); 3133 SirtRef<mirror::ClassLoader> class_loader(self, klass->GetClassLoader()); 3134 SirtRef<mirror::DexCache> dex_cache(self, kh.GetDexCache()); 3135 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3136 this, *dex_class_def); 3137 if (it.HasNext()) { 3138 CHECK(can_init_statics); 3139 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 3140 SafeMap<uint32_t, mirror::ArtField*> field_map; 3141 ConstructFieldMap(dex_file, *dex_class_def, klass.get(), field_map); 3142 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3143 if (Runtime::Current()->IsActiveTransaction()) { 3144 it.ReadValueToField<true>(field_map.Get(i)); 3145 } else { 3146 it.ReadValueToField<false>(field_map.Get(i)); 3147 } 3148 } 3149 } 3150 } 3151 3152 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3153 if (clinit != NULL) { 3154 CHECK(can_init_statics); 3155 if (LIKELY(Runtime::Current()->IsStarted())) { 3156 JValue result; 3157 clinit->Invoke(self, NULL, 0, &result, "V"); 3158 } else { 3159 art::interpreter::EnterInterpreterFromInvoke(self, clinit, NULL, NULL, NULL); 3160 } 3161 } 3162 3163 uint64_t t1 = NanoTime(); 3164 3165 bool success = true; 3166 { 3167 ObjectLock<mirror::Class> lock(self, &klass); 3168 3169 if (self->IsExceptionPending()) { 3170 WrapExceptionInInitializer(); 3171 klass->SetStatus(mirror::Class::kStatusError, self); 3172 success = false; 3173 } else { 3174 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3175 RuntimeStats* thread_stats = self->GetStats(); 3176 ++global_stats->class_init_count; 3177 ++thread_stats->class_init_count; 3178 global_stats->class_init_time_ns += (t1 - t0); 3179 thread_stats->class_init_time_ns += (t1 - t0); 3180 // Set the class as initialized except if failed to initialize static fields. 3181 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3182 if (VLOG_IS_ON(class_linker)) { 3183 ClassHelper kh(klass.get()); 3184 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 3185 } 3186 // Opportunistically set static method trampolines to their destination. 3187 FixupStaticTrampolines(klass.get()); 3188 } 3189 } 3190 return success; 3191} 3192 3193bool ClassLinker::WaitForInitializeClass(const SirtRef<mirror::Class>& klass, Thread* self, 3194 ObjectLock<mirror::Class>& lock) 3195 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3196 while (true) { 3197 self->AssertNoPendingException(); 3198 CHECK(!klass->IsInitialized()); 3199 lock.WaitIgnoringInterrupts(); 3200 3201 // When we wake up, repeat the test for init-in-progress. If 3202 // there's an exception pending (only possible if 3203 // "interruptShouldThrow" was set), bail out. 3204 if (self->IsExceptionPending()) { 3205 WrapExceptionInInitializer(); 3206 klass->SetStatus(mirror::Class::kStatusError, self); 3207 return false; 3208 } 3209 // Spurious wakeup? Go back to waiting. 3210 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3211 continue; 3212 } 3213 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3214 // Compile time initialization failed. 3215 return false; 3216 } 3217 if (klass->IsErroneous()) { 3218 // The caller wants an exception, but it was thrown in a 3219 // different thread. Synthesize one here. 3220 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3221 PrettyDescriptor(klass.get()).c_str()); 3222 return false; 3223 } 3224 if (klass->IsInitialized()) { 3225 return true; 3226 } 3227 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.get()) << " is " 3228 << klass->GetStatus(); 3229 } 3230 LOG(FATAL) << "Not Reached" << PrettyClass(klass.get()); 3231} 3232 3233bool ClassLinker::ValidateSuperClassDescriptors(const SirtRef<mirror::Class>& klass) { 3234 if (klass->IsInterface()) { 3235 return true; 3236 } 3237 Thread* self = Thread::Current(); 3238 // begin with the methods local to the superclass 3239 if (klass->HasSuperClass() && 3240 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3241 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 3242 for (int i = super->GetVTable()->GetLength() - 1; i >= 0; --i) { 3243 mirror::ArtMethod* method = klass->GetVTable()->Get(i); 3244 if (method != super->GetVTable()->Get(i) && 3245 !IsSameMethodSignatureInDifferentClassContexts(method, super.get(), klass.get())) { 3246 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in superclass %s", 3247 PrettyDescriptor(klass.get()).c_str(), PrettyMethod(method).c_str(), 3248 PrettyDescriptor(super.get()).c_str()); 3249 return false; 3250 } 3251 } 3252 } 3253 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3254 SirtRef<mirror::Class> interface(self, klass->GetIfTable()->GetInterface(i)); 3255 if (klass->GetClassLoader() != interface->GetClassLoader()) { 3256 for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { 3257 mirror::ArtMethod* method = klass->GetIfTable()->GetMethodArray(i)->Get(j); 3258 if (!IsSameMethodSignatureInDifferentClassContexts(method, interface.get(), 3259 method->GetDeclaringClass())) { 3260 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in interface %s", 3261 PrettyDescriptor(method->GetDeclaringClass()).c_str(), 3262 PrettyMethod(method).c_str(), 3263 PrettyDescriptor(interface.get()).c_str()); 3264 return false; 3265 } 3266 } 3267 } 3268 } 3269 return true; 3270} 3271 3272// Returns true if classes referenced by the signature of the method are the 3273// same classes in klass1 as they are in klass2. 3274bool ClassLinker::IsSameMethodSignatureInDifferentClassContexts(mirror::ArtMethod* method, 3275 mirror::Class* klass1, 3276 mirror::Class* klass2) { 3277 if (klass1 == klass2) { 3278 return true; 3279 } 3280 Thread* self = Thread::Current(); 3281 CHECK(klass1 != nullptr); 3282 CHECK(klass2 != nullptr); 3283 SirtRef<mirror::ClassLoader> loader1(self, klass1->GetClassLoader()); 3284 SirtRef<mirror::ClassLoader> loader2(self, klass2->GetClassLoader()); 3285 const DexFile& dex_file = *method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 3286 const DexFile::ProtoId& proto_id = 3287 dex_file.GetMethodPrototype(dex_file.GetMethodId(method->GetDexMethodIndex())); 3288 for (DexFileParameterIterator it(dex_file, proto_id); it.HasNext(); it.Next()) { 3289 const char* descriptor = it.GetDescriptor(); 3290 if (descriptor == nullptr) { 3291 break; 3292 } 3293 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3294 // Found a non-primitive type. 3295 if (!IsSameDescriptorInDifferentClassContexts(descriptor, loader1, loader2)) { 3296 return false; 3297 } 3298 } 3299 } 3300 // Check the return type 3301 const char* descriptor = dex_file.GetReturnTypeDescriptor(proto_id); 3302 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3303 if (!IsSameDescriptorInDifferentClassContexts(descriptor, loader1, loader2)) { 3304 return false; 3305 } 3306 } 3307 return true; 3308} 3309 3310// Returns true if the descriptor resolves to the same class in the context of loader1 and loader2. 3311bool ClassLinker::IsSameDescriptorInDifferentClassContexts(const char* descriptor, 3312 SirtRef<mirror::ClassLoader>& loader1, 3313 SirtRef<mirror::ClassLoader>& loader2) { 3314 CHECK(descriptor != nullptr); 3315 Thread* self = Thread::Current(); 3316 SirtRef<mirror::Class> found1(self, FindClass(descriptor, loader1)); 3317 if (found1.get() == nullptr) { 3318 self->ClearException(); 3319 } 3320 mirror::Class* found2 = FindClass(descriptor, loader2); 3321 if (found2 == nullptr) { 3322 self->ClearException(); 3323 } 3324 return found1.get() == found2; 3325} 3326 3327bool ClassLinker::EnsureInitialized(const SirtRef<mirror::Class>& c, bool can_init_fields, 3328 bool can_init_parents) { 3329 DCHECK(c.get() != NULL); 3330 if (c->IsInitialized()) { 3331 return true; 3332 } 3333 3334 bool success = InitializeClass(c, can_init_fields, can_init_parents); 3335 if (!success) { 3336 if (can_init_fields && can_init_parents) { 3337 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.get()); 3338 } 3339 } 3340 return success; 3341} 3342 3343void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3344 mirror::Class* c, 3345 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3346 const byte* class_data = dex_file.GetClassData(dex_class_def); 3347 ClassDataItemIterator it(dex_file, class_data); 3348 Thread* self = Thread::Current(); 3349 SirtRef<mirror::DexCache> dex_cache(self, c->GetDexCache()); 3350 SirtRef<mirror::ClassLoader> class_loader(self, c->GetClassLoader()); 3351 CHECK(!kMovingFields); 3352 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3353 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3354 } 3355} 3356 3357bool ClassLinker::LinkClass(Thread* self, const SirtRef<mirror::Class>& klass, 3358 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3359 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3360 if (!LinkSuperClass(klass)) { 3361 return false; 3362 } 3363 if (!LinkMethods(klass, interfaces)) { 3364 return false; 3365 } 3366 if (!LinkInstanceFields(klass)) { 3367 return false; 3368 } 3369 if (!LinkStaticFields(klass)) { 3370 return false; 3371 } 3372 CreateReferenceInstanceOffsets(klass); 3373 CreateReferenceStaticOffsets(klass); 3374 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3375 klass->SetStatus(mirror::Class::kStatusResolved, self); 3376 return true; 3377} 3378 3379bool ClassLinker::LoadSuperAndInterfaces(const SirtRef<mirror::Class>& klass, 3380 const DexFile& dex_file) { 3381 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3382 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3383 uint16_t super_class_idx = class_def.superclass_idx_; 3384 if (super_class_idx != DexFile::kDexNoIndex16) { 3385 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.get()); 3386 if (super_class == NULL) { 3387 DCHECK(Thread::Current()->IsExceptionPending()); 3388 return false; 3389 } 3390 // Verify 3391 if (!klass->CanAccess(super_class)) { 3392 ThrowIllegalAccessError(klass.get(), "Class %s extended by class %s is inaccessible", 3393 PrettyDescriptor(super_class).c_str(), 3394 PrettyDescriptor(klass.get()).c_str()); 3395 return false; 3396 } 3397 klass->SetSuperClass(super_class); 3398 } 3399 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3400 if (interfaces != NULL) { 3401 for (size_t i = 0; i < interfaces->Size(); i++) { 3402 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3403 mirror::Class* interface = ResolveType(dex_file, idx, klass.get()); 3404 if (interface == NULL) { 3405 DCHECK(Thread::Current()->IsExceptionPending()); 3406 return false; 3407 } 3408 // Verify 3409 if (!klass->CanAccess(interface)) { 3410 // TODO: the RI seemed to ignore this in my testing. 3411 ThrowIllegalAccessError(klass.get(), "Interface %s implemented by class %s is inaccessible", 3412 PrettyDescriptor(interface).c_str(), 3413 PrettyDescriptor(klass.get()).c_str()); 3414 return false; 3415 } 3416 } 3417 } 3418 // Mark the class as loaded. 3419 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3420 return true; 3421} 3422 3423bool ClassLinker::LinkSuperClass(const SirtRef<mirror::Class>& klass) { 3424 CHECK(!klass->IsPrimitive()); 3425 mirror::Class* super = klass->GetSuperClass(); 3426 if (klass.get() == GetClassRoot(kJavaLangObject)) { 3427 if (super != NULL) { 3428 ThrowClassFormatError(klass.get(), "java.lang.Object must not have a superclass"); 3429 return false; 3430 } 3431 return true; 3432 } 3433 if (super == NULL) { 3434 ThrowLinkageError(klass.get(), "No superclass defined for class %s", 3435 PrettyDescriptor(klass.get()).c_str()); 3436 return false; 3437 } 3438 // Verify 3439 if (super->IsFinal() || super->IsInterface()) { 3440 ThrowIncompatibleClassChangeError(klass.get(), "Superclass %s of %s is %s", 3441 PrettyDescriptor(super).c_str(), 3442 PrettyDescriptor(klass.get()).c_str(), 3443 super->IsFinal() ? "declared final" : "an interface"); 3444 return false; 3445 } 3446 if (!klass->CanAccess(super)) { 3447 ThrowIllegalAccessError(klass.get(), "Superclass %s is inaccessible to class %s", 3448 PrettyDescriptor(super).c_str(), 3449 PrettyDescriptor(klass.get()).c_str()); 3450 return false; 3451 } 3452 3453 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3454 if (super->IsFinalizable()) { 3455 klass->SetFinalizable(); 3456 } 3457 3458 // Inherit reference flags (if any) from the superclass. 3459 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3460 if (reference_flags != 0) { 3461 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3462 } 3463 // Disallow custom direct subclasses of java.lang.ref.Reference. 3464 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3465 ThrowLinkageError(klass.get(), 3466 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3467 PrettyDescriptor(klass.get()).c_str()); 3468 return false; 3469 } 3470 3471 if (kIsDebugBuild) { 3472 // Ensure super classes are fully resolved prior to resolving fields.. 3473 while (super != NULL) { 3474 CHECK(super->IsResolved()); 3475 super = super->GetSuperClass(); 3476 } 3477 } 3478 return true; 3479} 3480 3481// Populate the class vtable and itable. Compute return type indices. 3482bool ClassLinker::LinkMethods(const SirtRef<mirror::Class>& klass, 3483 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3484 if (klass->IsInterface()) { 3485 // No vtable. 3486 size_t count = klass->NumVirtualMethods(); 3487 if (!IsUint(16, count)) { 3488 ThrowClassFormatError(klass.get(), "Too many methods on interface: %zd", count); 3489 return false; 3490 } 3491 for (size_t i = 0; i < count; ++i) { 3492 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3493 } 3494 // Link interface method tables 3495 return LinkInterfaceMethods(klass, interfaces); 3496 } else { 3497 // Link virtual and interface method tables 3498 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3499 } 3500 return true; 3501} 3502 3503bool ClassLinker::LinkVirtualMethods(const SirtRef<mirror::Class>& klass) { 3504 Thread* self = Thread::Current(); 3505 if (klass->HasSuperClass()) { 3506 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3507 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3508 CHECK_LE(actual_count, max_count); 3509 // TODO: do not assign to the vtable field until it is fully constructed. 3510 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3511 vtable(self, klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count)); 3512 if (UNLIKELY(vtable.get() == NULL)) { 3513 CHECK(self->IsExceptionPending()); // OOME. 3514 return false; 3515 } 3516 // See if any of our virtual methods override the superclass. 3517 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3518 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3519 MethodHelper local_mh(local_method); 3520 size_t j = 0; 3521 for (; j < actual_count; ++j) { 3522 mirror::ArtMethod* super_method = vtable->Get(j); 3523 MethodHelper super_mh(super_method); 3524 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3525 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3526 if (super_method->IsFinal()) { 3527 ThrowLinkageError(klass.get(), "Method %s overrides final method in class %s", 3528 PrettyMethod(local_method).c_str(), 3529 super_mh.GetDeclaringClassDescriptor()); 3530 return false; 3531 } 3532 vtable->Set<false>(j, local_method); 3533 local_method->SetMethodIndex(j); 3534 break; 3535 } else { 3536 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3537 << " would have incorrectly overridden the package-private method in " 3538 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3539 } 3540 } 3541 } 3542 if (j == actual_count) { 3543 // Not overriding, append. 3544 vtable->Set<false>(actual_count, local_method); 3545 local_method->SetMethodIndex(actual_count); 3546 actual_count += 1; 3547 } 3548 } 3549 if (!IsUint(16, actual_count)) { 3550 ThrowClassFormatError(klass.get(), "Too many methods defined on class: %zd", actual_count); 3551 return false; 3552 } 3553 // Shrink vtable if possible 3554 CHECK_LE(actual_count, max_count); 3555 if (actual_count < max_count) { 3556 vtable.reset(vtable->CopyOf(self, actual_count)); 3557 if (UNLIKELY(vtable.get() == NULL)) { 3558 CHECK(self->IsExceptionPending()); // OOME. 3559 return false; 3560 } 3561 } 3562 klass->SetVTable(vtable.get()); 3563 } else { 3564 CHECK(klass.get() == GetClassRoot(kJavaLangObject)); 3565 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3566 if (!IsUint(16, num_virtual_methods)) { 3567 ThrowClassFormatError(klass.get(), "Too many methods: %d", num_virtual_methods); 3568 return false; 3569 } 3570 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3571 vtable(self, AllocArtMethodArray(self, num_virtual_methods)); 3572 if (UNLIKELY(vtable.get() == NULL)) { 3573 CHECK(self->IsExceptionPending()); // OOME. 3574 return false; 3575 } 3576 for (size_t i = 0; i < num_virtual_methods; ++i) { 3577 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3578 vtable->Set<false>(i, virtual_method); 3579 virtual_method->SetMethodIndex(i & 0xFFFF); 3580 } 3581 klass->SetVTable(vtable.get()); 3582 } 3583 return true; 3584} 3585 3586bool ClassLinker::LinkInterfaceMethods(const SirtRef<mirror::Class>& klass, 3587 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3588 // Set the imt table to be all conflicts by default. 3589 klass->SetImTable(Runtime::Current()->GetDefaultImt()); 3590 size_t super_ifcount; 3591 if (klass->HasSuperClass()) { 3592 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3593 } else { 3594 super_ifcount = 0; 3595 } 3596 size_t ifcount = super_ifcount; 3597 uint32_t num_interfaces; 3598 { 3599 ClassHelper kh(klass.get()); 3600 num_interfaces = 3601 interfaces.get() == nullptr ? kh.NumDirectInterfaces() : interfaces->GetLength(); 3602 ifcount += num_interfaces; 3603 for (size_t i = 0; i < num_interfaces; i++) { 3604 mirror::Class* interface = 3605 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3606 ifcount += interface->GetIfTableCount(); 3607 } 3608 } 3609 if (ifcount == 0) { 3610 // Class implements no interfaces. 3611 DCHECK_EQ(klass->GetIfTableCount(), 0); 3612 DCHECK(klass->GetIfTable() == NULL); 3613 return true; 3614 } 3615 if (ifcount == super_ifcount) { 3616 // Class implements same interfaces as parent, are any of these not marker interfaces? 3617 bool has_non_marker_interface = false; 3618 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3619 for (size_t i = 0; i < ifcount; ++i) { 3620 if (super_iftable->GetMethodArrayCount(i) > 0) { 3621 has_non_marker_interface = true; 3622 break; 3623 } 3624 } 3625 if (!has_non_marker_interface) { 3626 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3627 klass->SetIfTable(super_iftable); 3628 return true; 3629 } 3630 } 3631 Thread* self = Thread::Current(); 3632 SirtRef<mirror::IfTable> iftable(self, AllocIfTable(self, ifcount)); 3633 if (UNLIKELY(iftable.get() == NULL)) { 3634 CHECK(self->IsExceptionPending()); // OOME. 3635 return false; 3636 } 3637 if (super_ifcount != 0) { 3638 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3639 for (size_t i = 0; i < super_ifcount; i++) { 3640 mirror::Class* super_interface = super_iftable->GetInterface(i); 3641 iftable->SetInterface(i, super_interface); 3642 } 3643 } 3644 // Flatten the interface inheritance hierarchy. 3645 size_t idx = super_ifcount; 3646 for (size_t i = 0; i < num_interfaces; i++) { 3647 ClassHelper kh(klass.get()); 3648 mirror::Class* interface = 3649 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3650 DCHECK(interface != NULL); 3651 if (!interface->IsInterface()) { 3652 ClassHelper ih(interface); 3653 ThrowIncompatibleClassChangeError(klass.get(), "Class %s implements non-interface class %s", 3654 PrettyDescriptor(klass.get()).c_str(), 3655 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3656 return false; 3657 } 3658 // Check if interface is already in iftable 3659 bool duplicate = false; 3660 for (size_t j = 0; j < idx; j++) { 3661 mirror::Class* existing_interface = iftable->GetInterface(j); 3662 if (existing_interface == interface) { 3663 duplicate = true; 3664 break; 3665 } 3666 } 3667 if (!duplicate) { 3668 // Add this non-duplicate interface. 3669 iftable->SetInterface(idx++, interface); 3670 // Add this interface's non-duplicate super-interfaces. 3671 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3672 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3673 bool super_duplicate = false; 3674 for (size_t k = 0; k < idx; k++) { 3675 mirror::Class* existing_interface = iftable->GetInterface(k); 3676 if (existing_interface == super_interface) { 3677 super_duplicate = true; 3678 break; 3679 } 3680 } 3681 if (!super_duplicate) { 3682 iftable->SetInterface(idx++, super_interface); 3683 } 3684 } 3685 } 3686 } 3687 // Shrink iftable in case duplicates were found 3688 if (idx < ifcount) { 3689 iftable.reset(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3690 if (UNLIKELY(iftable.get() == NULL)) { 3691 CHECK(self->IsExceptionPending()); // OOME. 3692 return false; 3693 } 3694 ifcount = idx; 3695 } else { 3696 CHECK_EQ(idx, ifcount); 3697 } 3698 klass->SetIfTable(iftable.get()); 3699 3700 // If we're an interface, we don't need the vtable pointers, so we're done. 3701 if (klass->IsInterface()) { 3702 return true; 3703 } 3704 // Allocate imtable 3705 bool imtable_changed = false; 3706 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > imtable(self, AllocArtMethodArray(self, kImtSize)); 3707 if (UNLIKELY(imtable.get() == NULL)) { 3708 CHECK(self->IsExceptionPending()); // OOME. 3709 return false; 3710 } 3711 std::vector<mirror::ArtMethod*> miranda_list; 3712 for (size_t i = 0; i < ifcount; ++i) { 3713 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 3714 if (num_methods > 0) { 3715 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3716 method_array(self, AllocArtMethodArray(self, num_methods)); 3717 if (UNLIKELY(method_array.get() == nullptr)) { 3718 CHECK(self->IsExceptionPending()); // OOME. 3719 return false; 3720 } 3721 iftable->SetMethodArray(i, method_array.get()); 3722 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > vtable(self, 3723 klass->GetVTableDuringLinking()); 3724 for (size_t j = 0; j < num_methods; ++j) { 3725 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 3726 MethodHelper interface_mh(interface_method); 3727 int32_t k; 3728 // For each method listed in the interface's method list, find the 3729 // matching method in our class's method list. We want to favor the 3730 // subclass over the superclass, which just requires walking 3731 // back from the end of the vtable. (This only matters if the 3732 // superclass defines a private method and this class redefines 3733 // it -- otherwise it would use the same vtable slot. In .dex files 3734 // those don't end up in the virtual method table, so it shouldn't 3735 // matter which direction we go. We walk it backward anyway.) 3736 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3737 mirror::ArtMethod* vtable_method = vtable->Get(k); 3738 MethodHelper vtable_mh(vtable_method); 3739 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3740 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3741 ThrowIllegalAccessError(klass.get(), 3742 "Method '%s' implementing interface method '%s' is not public", 3743 PrettyMethod(vtable_method).c_str(), 3744 PrettyMethod(interface_method).c_str()); 3745 return false; 3746 } 3747 method_array->Set<false>(j, vtable_method); 3748 // Place method in imt if entry is empty, place conflict otherwise. 3749 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3750 if (imtable->Get(imt_index) == NULL) { 3751 imtable->Set<false>(imt_index, vtable_method); 3752 imtable_changed = true; 3753 } else { 3754 imtable->Set<false>(imt_index, Runtime::Current()->GetImtConflictMethod()); 3755 } 3756 break; 3757 } 3758 } 3759 if (k < 0) { 3760 SirtRef<mirror::ArtMethod> miranda_method(self, NULL); 3761 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3762 mirror::ArtMethod* mir_method = miranda_list[mir]; 3763 MethodHelper vtable_mh(mir_method); 3764 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3765 miranda_method.reset(miranda_list[mir]); 3766 break; 3767 } 3768 } 3769 if (miranda_method.get() == NULL) { 3770 // Point the interface table at a phantom slot. 3771 miranda_method.reset(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3772 if (UNLIKELY(miranda_method.get() == NULL)) { 3773 CHECK(self->IsExceptionPending()); // OOME. 3774 return false; 3775 } 3776 // TODO: If a methods move then the miranda_list may hold stale references. 3777 miranda_list.push_back(miranda_method.get()); 3778 } 3779 method_array->Set<false>(j, miranda_method.get()); 3780 } 3781 } 3782 } 3783 } 3784 if (imtable_changed) { 3785 // Fill in empty entries in interface method table with conflict. 3786 mirror::ArtMethod* imt_conflict_method = Runtime::Current()->GetImtConflictMethod(); 3787 for (size_t i = 0; i < kImtSize; i++) { 3788 if (imtable->Get(i) == NULL) { 3789 imtable->Set<false>(i, imt_conflict_method); 3790 } 3791 } 3792 klass->SetImTable(imtable.get()); 3793 } 3794 if (!miranda_list.empty()) { 3795 int old_method_count = klass->NumVirtualMethods(); 3796 int new_method_count = old_method_count + miranda_list.size(); 3797 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3798 if (old_method_count == 0) { 3799 virtuals = AllocArtMethodArray(self, new_method_count); 3800 } else { 3801 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3802 } 3803 if (UNLIKELY(virtuals == NULL)) { 3804 CHECK(self->IsExceptionPending()); // OOME. 3805 return false; 3806 } 3807 klass->SetVirtualMethods(virtuals); 3808 3809 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3810 vtable(self, klass->GetVTableDuringLinking()); 3811 CHECK(vtable.get() != NULL); 3812 int old_vtable_count = vtable->GetLength(); 3813 int new_vtable_count = old_vtable_count + miranda_list.size(); 3814 vtable.reset(vtable->CopyOf(self, new_vtable_count)); 3815 if (UNLIKELY(vtable.get() == NULL)) { 3816 CHECK(self->IsExceptionPending()); // OOME. 3817 return false; 3818 } 3819 for (size_t i = 0; i < miranda_list.size(); ++i) { 3820 mirror::ArtMethod* method = miranda_list[i]; 3821 // Leave the declaring class alone as type indices are relative to it 3822 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3823 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3824 klass->SetVirtualMethod(old_method_count + i, method); 3825 vtable->Set<false>(old_vtable_count + i, method); 3826 } 3827 // TODO: do not assign to the vtable field until it is fully constructed. 3828 klass->SetVTable(vtable.get()); 3829 } 3830 3831 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3832 for (int i = 0; i < vtable->GetLength(); ++i) { 3833 CHECK(vtable->Get(i) != NULL); 3834 } 3835 3836// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3837 3838 return true; 3839} 3840 3841bool ClassLinker::LinkInstanceFields(const SirtRef<mirror::Class>& klass) { 3842 CHECK(klass.get() != NULL); 3843 return LinkFields(klass, false); 3844} 3845 3846bool ClassLinker::LinkStaticFields(const SirtRef<mirror::Class>& klass) { 3847 CHECK(klass.get() != NULL); 3848 size_t allocated_class_size = klass->GetClassSize(); 3849 bool success = LinkFields(klass, true); 3850 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3851 return success; 3852} 3853 3854struct LinkFieldsComparator { 3855 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3856 } 3857 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3858 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 3859 NO_THREAD_SAFETY_ANALYSIS { 3860 // First come reference fields, then 64-bit, and finally 32-bit 3861 FieldHelper fh1(field1); 3862 Primitive::Type type1 = fh1.GetTypeAsPrimitiveType(); 3863 FieldHelper fh2(field2); 3864 Primitive::Type type2 = fh2.GetTypeAsPrimitiveType(); 3865 if (type1 != type2) { 3866 bool is_primitive1 = type1 != Primitive::kPrimNot; 3867 bool is_primitive2 = type2 != Primitive::kPrimNot; 3868 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3869 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3870 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 3871 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 3872 if (order1 != order2) { 3873 return order1 < order2; 3874 } 3875 } 3876 // same basic group? then sort by string. 3877 const char* name1 = fh1.GetName(); 3878 const char* name2 = fh2.GetName(); 3879 return strcmp(name1, name2) < 0; 3880 } 3881}; 3882 3883bool ClassLinker::LinkFields(const SirtRef<mirror::Class>& klass, bool is_static) { 3884 size_t num_fields = 3885 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3886 3887 mirror::ObjectArray<mirror::ArtField>* fields = 3888 is_static ? klass->GetSFields() : klass->GetIFields(); 3889 3890 // Initialize size and field_offset 3891 size_t size; 3892 MemberOffset field_offset(0); 3893 if (is_static) { 3894 size = klass->GetClassSize(); 3895 field_offset = mirror::Class::FieldsOffset(); 3896 } else { 3897 mirror::Class* super_class = klass->GetSuperClass(); 3898 if (super_class != NULL) { 3899 CHECK(super_class->IsResolved()); 3900 field_offset = MemberOffset(super_class->GetObjectSize()); 3901 } 3902 size = field_offset.Uint32Value(); 3903 } 3904 3905 CHECK_EQ(num_fields == 0, fields == NULL); 3906 3907 // we want a relatively stable order so that adding new fields 3908 // minimizes disruption of C++ version such as Class and Method. 3909 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3910 for (size_t i = 0; i < num_fields; i++) { 3911 mirror::ArtField* f = fields->Get(i); 3912 CHECK(f != NULL); 3913 grouped_and_sorted_fields.push_back(f); 3914 } 3915 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 3916 LinkFieldsComparator()); 3917 3918 // References should be at the front. 3919 size_t current_field = 0; 3920 size_t num_reference_fields = 0; 3921 for (; current_field < num_fields; current_field++) { 3922 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3923 FieldHelper fh(field); 3924 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3925 bool isPrimitive = type != Primitive::kPrimNot; 3926 if (isPrimitive) { 3927 break; // past last reference, move on to the next phase 3928 } 3929 grouped_and_sorted_fields.pop_front(); 3930 num_reference_fields++; 3931 fields->Set<false>(current_field, field); 3932 field->SetOffset(field_offset); 3933 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3934 } 3935 3936 // Now we want to pack all of the double-wide fields together. If 3937 // we're not aligned, though, we want to shuffle one 32-bit field 3938 // into place. If we can't find one, we'll have to pad it. 3939 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3940 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 3941 mirror::ArtField* field = grouped_and_sorted_fields[i]; 3942 FieldHelper fh(field); 3943 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3944 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3945 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 3946 continue; 3947 } 3948 fields->Set<false>(current_field++, field); 3949 field->SetOffset(field_offset); 3950 // drop the consumed field 3951 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 3952 break; 3953 } 3954 // whether we found a 32-bit field for padding or not, we advance 3955 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3956 } 3957 3958 // Alignment is good, shuffle any double-wide fields forward, and 3959 // finish assigning field offsets to all fields. 3960 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 3961 while (!grouped_and_sorted_fields.empty()) { 3962 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3963 grouped_and_sorted_fields.pop_front(); 3964 FieldHelper fh(field); 3965 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3966 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 3967 fields->Set<false>(current_field, field); 3968 field->SetOffset(field_offset); 3969 field_offset = MemberOffset(field_offset.Uint32Value() + 3970 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 3971 ? sizeof(uint64_t) 3972 : sizeof(uint32_t))); 3973 current_field++; 3974 } 3975 3976 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 3977 if (!is_static && 3978 (strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0)) { 3979 // We know there are no non-reference fields in the Reference classes, and we know 3980 // that 'referent' is alphabetically last, so this is easy... 3981 CHECK_EQ(num_reference_fields, num_fields); 3982 FieldHelper fh(fields->Get(num_fields - 1)); 3983 CHECK_STREQ(fh.GetName(), "referent"); 3984 --num_reference_fields; 3985 } 3986 3987 if (kIsDebugBuild) { 3988 // Make sure that all reference fields appear before 3989 // non-reference fields, and all double-wide fields are aligned. 3990 bool seen_non_ref = false; 3991 for (size_t i = 0; i < num_fields; i++) { 3992 mirror::ArtField* field = fields->Get(i); 3993 if (false) { // enable to debug field layout 3994 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 3995 << " class=" << PrettyClass(klass.get()) 3996 << " field=" << PrettyField(field) 3997 << " offset=" << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset()), 3998 false); 3999 } 4000 FieldHelper fh(field); 4001 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4002 bool is_primitive = type != Primitive::kPrimNot; 4003 if ((strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0) 4004 && (strcmp("referent", fh.GetName()) == 0)) { 4005 is_primitive = true; // We lied above, so we have to expect a lie here. 4006 } 4007 if (is_primitive) { 4008 if (!seen_non_ref) { 4009 seen_non_ref = true; 4010 DCHECK_EQ(num_reference_fields, i); 4011 } 4012 } else { 4013 DCHECK(!seen_non_ref); 4014 } 4015 } 4016 if (!seen_non_ref) { 4017 DCHECK_EQ(num_fields, num_reference_fields); 4018 } 4019 } 4020 size = field_offset.Uint32Value(); 4021 // Update klass 4022 if (is_static) { 4023 klass->SetNumReferenceStaticFields(num_reference_fields); 4024 klass->SetClassSize(size); 4025 } else { 4026 klass->SetNumReferenceInstanceFields(num_reference_fields); 4027 if (!klass->IsVariableSize()) { 4028 DCHECK_GE(size, sizeof(mirror::Object)) << ClassHelper(klass.get()).GetDescriptor(); 4029 size_t previous_size = klass->GetObjectSize(); 4030 if (previous_size != 0) { 4031 // Make sure that we didn't originally have an incorrect size. 4032 CHECK_EQ(previous_size, size); 4033 } 4034 klass->SetObjectSize(size); 4035 } 4036 } 4037 return true; 4038} 4039 4040// Set the bitmap of reference offsets, refOffsets, from the ifields 4041// list. 4042void ClassLinker::CreateReferenceInstanceOffsets(const SirtRef<mirror::Class>& klass) { 4043 uint32_t reference_offsets = 0; 4044 mirror::Class* super_class = klass->GetSuperClass(); 4045 if (super_class != NULL) { 4046 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4047 // If our superclass overflowed, we don't stand a chance. 4048 if (reference_offsets == CLASS_WALK_SUPER) { 4049 klass->SetReferenceInstanceOffsets(reference_offsets); 4050 return; 4051 } 4052 } 4053 CreateReferenceOffsets(klass, false, reference_offsets); 4054} 4055 4056void ClassLinker::CreateReferenceStaticOffsets(const SirtRef<mirror::Class>& klass) { 4057 CreateReferenceOffsets(klass, true, 0); 4058} 4059 4060void ClassLinker::CreateReferenceOffsets(const SirtRef<mirror::Class>& klass, bool is_static, 4061 uint32_t reference_offsets) { 4062 size_t num_reference_fields = 4063 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4064 : klass->NumReferenceInstanceFieldsDuringLinking(); 4065 mirror::ObjectArray<mirror::ArtField>* fields = 4066 is_static ? klass->GetSFields() : klass->GetIFields(); 4067 // All of the fields that contain object references are guaranteed 4068 // to be at the beginning of the fields list. 4069 for (size_t i = 0; i < num_reference_fields; ++i) { 4070 // Note that byte_offset is the offset from the beginning of 4071 // object, not the offset into instance data 4072 mirror::ArtField* field = fields->Get(i); 4073 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4074 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4075 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4076 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4077 CHECK_NE(new_bit, 0U); 4078 reference_offsets |= new_bit; 4079 } else { 4080 reference_offsets = CLASS_WALK_SUPER; 4081 break; 4082 } 4083 } 4084 // Update fields in klass 4085 if (is_static) { 4086 klass->SetReferenceStaticOffsets(reference_offsets); 4087 } else { 4088 klass->SetReferenceInstanceOffsets(reference_offsets); 4089 } 4090} 4091 4092mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4093 const SirtRef<mirror::DexCache>& dex_cache) { 4094 DCHECK(dex_cache.get() != nullptr); 4095 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4096 if (resolved != NULL) { 4097 return resolved; 4098 } 4099 uint32_t utf16_length; 4100 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4101 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4102 dex_cache->SetResolvedString(string_idx, string); 4103 return string; 4104} 4105 4106mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4107 mirror::Class* referrer) { 4108 Thread* self = Thread::Current(); 4109 SirtRef<mirror::DexCache> dex_cache(self, referrer->GetDexCache()); 4110 SirtRef<mirror::ClassLoader> class_loader(self, referrer->GetClassLoader()); 4111 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4112} 4113 4114mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4115 const SirtRef<mirror::DexCache>& dex_cache, 4116 const SirtRef<mirror::ClassLoader>& class_loader) { 4117 DCHECK(dex_cache.get() != NULL); 4118 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4119 if (resolved == NULL) { 4120 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4121 resolved = FindClass(descriptor, class_loader); 4122 if (resolved != NULL) { 4123 // TODO: we used to throw here if resolved's class loader was not the 4124 // boot class loader. This was to permit different classes with the 4125 // same name to be loaded simultaneously by different loaders 4126 dex_cache->SetResolvedType(type_idx, resolved); 4127 } else { 4128 Thread* self = Thread::Current(); 4129 CHECK(self->IsExceptionPending()) 4130 << "Expected pending exception for failed resolution of: " << descriptor; 4131 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4132 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 4133 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4134 DCHECK(resolved == NULL); // No SirtRef needed to preserve resolved. 4135 Thread::Current()->ClearException(); 4136 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4137 self->GetException(NULL)->SetCause(cause.get()); 4138 } 4139 } 4140 } 4141 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4142 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4143 return resolved; 4144} 4145 4146mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 4147 uint32_t method_idx, 4148 const SirtRef<mirror::DexCache>& dex_cache, 4149 const SirtRef<mirror::ClassLoader>& class_loader, 4150 mirror::ArtMethod* referrer, 4151 InvokeType type) { 4152 DCHECK(dex_cache.get() != NULL); 4153 // Check for hit in the dex cache. 4154 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4155 if (resolved != NULL && !resolved->IsRuntimeMethod()) { 4156 return resolved; 4157 } 4158 // Fail, get the declaring class. 4159 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4160 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4161 if (klass == NULL) { 4162 DCHECK(Thread::Current()->IsExceptionPending()); 4163 return NULL; 4164 } 4165 // Scan using method_idx, this saves string compares but will only hit for matching dex 4166 // caches/files. 4167 switch (type) { 4168 case kDirect: // Fall-through. 4169 case kStatic: 4170 resolved = klass->FindDirectMethod(dex_cache.get(), method_idx); 4171 break; 4172 case kInterface: 4173 resolved = klass->FindInterfaceMethod(dex_cache.get(), method_idx); 4174 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4175 break; 4176 case kSuper: // Fall-through. 4177 case kVirtual: 4178 resolved = klass->FindVirtualMethod(dex_cache.get(), method_idx); 4179 break; 4180 default: 4181 LOG(FATAL) << "Unreachable - invocation type: " << type; 4182 } 4183 if (resolved == NULL) { 4184 // Search by name, which works across dex files. 4185 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4186 const Signature signature = dex_file.GetMethodSignature(method_id); 4187 switch (type) { 4188 case kDirect: // Fall-through. 4189 case kStatic: 4190 resolved = klass->FindDirectMethod(name, signature); 4191 break; 4192 case kInterface: 4193 resolved = klass->FindInterfaceMethod(name, signature); 4194 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4195 break; 4196 case kSuper: // Fall-through. 4197 case kVirtual: 4198 resolved = klass->FindVirtualMethod(name, signature); 4199 break; 4200 } 4201 } 4202 if (resolved != NULL) { 4203 // We found a method, check for incompatible class changes. 4204 if (resolved->CheckIncompatibleClassChange(type)) { 4205 resolved = NULL; 4206 } 4207 } 4208 if (resolved != NULL) { 4209 // Be a good citizen and update the dex cache to speed subsequent calls. 4210 dex_cache->SetResolvedMethod(method_idx, resolved); 4211 return resolved; 4212 } else { 4213 // We failed to find the method which means either an access error, an incompatible class 4214 // change, or no such method. First try to find the method among direct and virtual methods. 4215 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4216 const Signature signature = dex_file.GetMethodSignature(method_id); 4217 switch (type) { 4218 case kDirect: 4219 case kStatic: 4220 resolved = klass->FindVirtualMethod(name, signature); 4221 break; 4222 case kInterface: 4223 case kVirtual: 4224 case kSuper: 4225 resolved = klass->FindDirectMethod(name, signature); 4226 break; 4227 } 4228 4229 // If we found something, check that it can be accessed by the referrer. 4230 if (resolved != NULL && referrer != NULL) { 4231 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4232 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4233 if (!referring_class->CanAccess(methods_class)) { 4234 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4235 resolved, type); 4236 return NULL; 4237 } else if (!referring_class->CanAccessMember(methods_class, 4238 resolved->GetAccessFlags())) { 4239 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4240 return NULL; 4241 } 4242 } 4243 4244 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4245 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4246 switch (type) { 4247 case kDirect: 4248 case kStatic: 4249 if (resolved != NULL) { 4250 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4251 } else { 4252 resolved = klass->FindInterfaceMethod(name, signature); 4253 if (resolved != NULL) { 4254 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4255 } else { 4256 ThrowNoSuchMethodError(type, klass, name, signature); 4257 } 4258 } 4259 break; 4260 case kInterface: 4261 if (resolved != NULL) { 4262 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4263 } else { 4264 resolved = klass->FindVirtualMethod(name, signature); 4265 if (resolved != NULL) { 4266 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4267 } else { 4268 ThrowNoSuchMethodError(type, klass, name, signature); 4269 } 4270 } 4271 break; 4272 case kSuper: 4273 ThrowNoSuchMethodError(type, klass, name, signature); 4274 break; 4275 case kVirtual: 4276 if (resolved != NULL) { 4277 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4278 } else { 4279 resolved = klass->FindInterfaceMethod(name, signature); 4280 if (resolved != NULL) { 4281 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4282 } else { 4283 ThrowNoSuchMethodError(type, klass, name, signature); 4284 } 4285 } 4286 break; 4287 } 4288 DCHECK(Thread::Current()->IsExceptionPending()); 4289 return NULL; 4290 } 4291} 4292 4293mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4294 const SirtRef<mirror::DexCache>& dex_cache, 4295 const SirtRef<mirror::ClassLoader>& class_loader, 4296 bool is_static) { 4297 DCHECK(dex_cache.get() != nullptr); 4298 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4299 if (resolved != NULL) { 4300 return resolved; 4301 } 4302 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4303 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4304 if (klass == NULL) { 4305 DCHECK(Thread::Current()->IsExceptionPending()); 4306 return NULL; 4307 } 4308 4309 if (is_static) { 4310 resolved = klass->FindStaticField(dex_cache.get(), field_idx); 4311 } else { 4312 resolved = klass->FindInstanceField(dex_cache.get(), field_idx); 4313 } 4314 4315 if (resolved == NULL) { 4316 const char* name = dex_file.GetFieldName(field_id); 4317 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4318 if (is_static) { 4319 resolved = klass->FindStaticField(name, type); 4320 } else { 4321 resolved = klass->FindInstanceField(name, type); 4322 } 4323 if (resolved == NULL) { 4324 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 4325 return NULL; 4326 } 4327 } 4328 dex_cache->SetResolvedField(field_idx, resolved); 4329 return resolved; 4330} 4331 4332mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4333 uint32_t field_idx, 4334 const SirtRef<mirror::DexCache>& dex_cache, 4335 const SirtRef<mirror::ClassLoader>& class_loader) { 4336 DCHECK(dex_cache.get() != nullptr); 4337 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4338 if (resolved != NULL) { 4339 return resolved; 4340 } 4341 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4342 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4343 if (klass == NULL) { 4344 DCHECK(Thread::Current()->IsExceptionPending()); 4345 return NULL; 4346 } 4347 4348 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4349 StringPiece type(dex_file.StringDataByIdx( 4350 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4351 resolved = klass->FindField(name, type); 4352 if (resolved != NULL) { 4353 dex_cache->SetResolvedField(field_idx, resolved); 4354 } else { 4355 ThrowNoSuchFieldError("", klass, type, name); 4356 } 4357 return resolved; 4358} 4359 4360const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4361 uint32_t* length) { 4362 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4363 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4364 const DexFile& dex_file = *dex_cache->GetDexFile(); 4365 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4366 return dex_file.GetMethodShorty(method_id, length); 4367} 4368 4369void ClassLinker::DumpAllClasses(int flags) { 4370 if (dex_cache_image_class_lookup_required_) { 4371 MoveImageClassesToClassTable(); 4372 } 4373 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4374 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4375 std::vector<mirror::Class*> all_classes; 4376 { 4377 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4378 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 4379 all_classes.push_back(it.second); 4380 } 4381 } 4382 4383 for (size_t i = 0; i < all_classes.size(); ++i) { 4384 all_classes[i]->DumpClass(std::cerr, flags); 4385 } 4386} 4387 4388void ClassLinker::DumpForSigQuit(std::ostream& os) { 4389 if (dex_cache_image_class_lookup_required_) { 4390 MoveImageClassesToClassTable(); 4391 } 4392 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4393 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4394} 4395 4396size_t ClassLinker::NumLoadedClasses() { 4397 if (dex_cache_image_class_lookup_required_) { 4398 MoveImageClassesToClassTable(); 4399 } 4400 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4401 return class_table_.size(); 4402} 4403 4404pid_t ClassLinker::GetClassesLockOwner() { 4405 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4406} 4407 4408pid_t ClassLinker::GetDexLockOwner() { 4409 return dex_lock_.GetExclusiveOwnerTid(); 4410} 4411 4412void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4413 DCHECK(!init_done_); 4414 4415 DCHECK(klass != NULL); 4416 DCHECK(klass->GetClassLoader() == NULL); 4417 4418 DCHECK(class_roots_ != NULL); 4419 DCHECK(class_roots_->Get(class_root) == NULL); 4420 class_roots_->Set<false>(class_root, klass); 4421} 4422 4423} // namespace art 4424