class_linker.cc revision b0fa5dc7769c1e054032f39de0a3f6d6dd06f8cf
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <fcntl.h> 20#include <sys/file.h> 21#include <sys/stat.h> 22 23#include <deque> 24#include <string> 25#include <utility> 26#include <vector> 27 28#include "base/casts.h" 29#include "base/logging.h" 30#include "base/stl_util.h" 31#include "base/unix_file/fd_file.h" 32#include "class_linker-inl.h" 33#include "compiler_callbacks.h" 34#include "debugger.h" 35#include "dex_file-inl.h" 36#include "gc/accounting/card_table-inl.h" 37#include "gc/accounting/heap_bitmap.h" 38#include "gc/heap.h" 39#include "gc/space/image_space.h" 40#include "intern_table.h" 41#include "interpreter/interpreter.h" 42#include "leb128.h" 43#include "oat.h" 44#include "oat_file.h" 45#include "mirror/art_field-inl.h" 46#include "mirror/art_method-inl.h" 47#include "mirror/class.h" 48#include "mirror/class-inl.h" 49#include "mirror/class_loader.h" 50#include "mirror/dex_cache-inl.h" 51#include "mirror/iftable-inl.h" 52#include "mirror/object-inl.h" 53#include "mirror/object_array-inl.h" 54#include "mirror/proxy.h" 55#include "mirror/stack_trace_element.h" 56#include "object_utils.h" 57#include "os.h" 58#include "runtime.h" 59#include "entrypoints/entrypoint_utils.h" 60#include "ScopedLocalRef.h" 61#include "scoped_thread_state_change.h" 62#include "sirt_ref.h" 63#include "stack_indirect_reference_table.h" 64#include "thread.h" 65#include "UniquePtr.h" 66#include "utils.h" 67#include "verifier/method_verifier.h" 68#include "well_known_classes.h" 69 70namespace art { 71 72static void ThrowNoClassDefFoundError(const char* fmt, ...) 73 __attribute__((__format__(__printf__, 1, 2))) 74 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 75static void ThrowNoClassDefFoundError(const char* fmt, ...) { 76 va_list args; 77 va_start(args, fmt); 78 Thread* self = Thread::Current(); 79 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 80 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 81 va_end(args); 82} 83 84static void ThrowEarlierClassFailure(mirror::Class* c) 85 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 86 // The class failed to initialize on a previous attempt, so we want to throw 87 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 88 // failed in verification, in which case v2 5.4.1 says we need to re-throw 89 // the previous error. 90 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 91 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 92 } 93 94 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 95 Thread* self = Thread::Current(); 96 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 97 if (c->GetVerifyErrorClass() != NULL) { 98 // TODO: change the verifier to store an _instance_, with a useful detail message? 99 ClassHelper ve_ch(c->GetVerifyErrorClass()); 100 self->ThrowNewException(throw_location, ve_ch.GetDescriptor(), PrettyDescriptor(c).c_str()); 101 } else { 102 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 103 PrettyDescriptor(c).c_str()); 104 } 105} 106 107static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 108 Thread* self = Thread::Current(); 109 JNIEnv* env = self->GetJniEnv(); 110 111 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 112 CHECK(cause.get() != NULL); 113 114 env->ExceptionClear(); 115 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 116 env->Throw(cause.get()); 117 118 // We only wrap non-Error exceptions; an Error can just be used as-is. 119 if (!is_error) { 120 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 121 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 122 } 123} 124 125static size_t Hash(const char* s) { 126 // This is the java.lang.String hashcode for convenience, not interoperability. 127 size_t hash = 0; 128 for (; *s != '\0'; ++s) { 129 hash = hash * 31 + *s; 130 } 131 return hash; 132} 133 134const char* ClassLinker::class_roots_descriptors_[] = { 135 "Ljava/lang/Class;", 136 "Ljava/lang/Object;", 137 "[Ljava/lang/Class;", 138 "[Ljava/lang/Object;", 139 "Ljava/lang/String;", 140 "Ljava/lang/DexCache;", 141 "Ljava/lang/ref/Reference;", 142 "Ljava/lang/reflect/ArtField;", 143 "Ljava/lang/reflect/ArtMethod;", 144 "Ljava/lang/reflect/Proxy;", 145 "[Ljava/lang/String;", 146 "[Ljava/lang/reflect/ArtField;", 147 "[Ljava/lang/reflect/ArtMethod;", 148 "Ljava/lang/ClassLoader;", 149 "Ljava/lang/Throwable;", 150 "Ljava/lang/ClassNotFoundException;", 151 "Ljava/lang/StackTraceElement;", 152 "Z", 153 "B", 154 "C", 155 "D", 156 "F", 157 "I", 158 "J", 159 "S", 160 "V", 161 "[Z", 162 "[B", 163 "[C", 164 "[D", 165 "[F", 166 "[I", 167 "[J", 168 "[S", 169 "[Ljava/lang/StackTraceElement;", 170}; 171 172ClassLinker::ClassLinker(InternTable* intern_table) 173 // dex_lock_ is recursive as it may be used in stack dumping. 174 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 175 dex_cache_image_class_lookup_required_(false), 176 failed_dex_cache_class_lookups_(0), 177 class_roots_(nullptr), 178 array_iftable_(nullptr), 179 find_array_class_cache_next_victim_(0), 180 init_done_(false), 181 log_new_dex_caches_roots_(false), 182 log_new_class_table_roots_(false), 183 intern_table_(intern_table), 184 portable_resolution_trampoline_(nullptr), 185 quick_resolution_trampoline_(nullptr), 186 portable_imt_conflict_trampoline_(nullptr), 187 quick_imt_conflict_trampoline_(nullptr), 188 quick_generic_jni_trampoline_(nullptr), 189 quick_to_interpreter_bridge_trampoline_(nullptr) { 190 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 191 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 192} 193 194void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 195 VLOG(startup) << "ClassLinker::Init"; 196 CHECK(Runtime::Current()->IsCompiler()); 197 198 CHECK(!init_done_); 199 200 // java_lang_Class comes first, it's needed for AllocClass 201 Thread* self = Thread::Current(); 202 gc::Heap* heap = Runtime::Current()->GetHeap(); 203 // The GC can't handle an object with a null class since we can't get the size of this object. 204 heap->IncrementDisableMovingGC(self); 205 SirtRef<mirror::Class> java_lang_Class(self, down_cast<mirror::Class*>( 206 heap->AllocNonMovableObject<true>(self, nullptr, sizeof(mirror::ClassClass), VoidFunctor()))); 207 CHECK(java_lang_Class.get() != NULL); 208 mirror::Class::SetClassClass(java_lang_Class.get()); 209 java_lang_Class->SetClass(java_lang_Class.get()); 210 if (kUseBakerOrBrooksReadBarrier) { 211 java_lang_Class->AssertReadBarrierPointer(); 212 } 213 java_lang_Class->SetClassSize(sizeof(mirror::ClassClass)); 214 heap->DecrementDisableMovingGC(self); 215 // AllocClass(mirror::Class*) can now be used 216 217 // Class[] is used for reflection support. 218 SirtRef<mirror::Class> class_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 219 class_array_class->SetComponentType(java_lang_Class.get()); 220 221 // java_lang_Object comes next so that object_array_class can be created. 222 SirtRef<mirror::Class> java_lang_Object(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 223 CHECK(java_lang_Object.get() != NULL); 224 // backfill Object as the super class of Class. 225 java_lang_Class->SetSuperClass(java_lang_Object.get()); 226 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 227 228 // Object[] next to hold class roots. 229 SirtRef<mirror::Class> object_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 230 object_array_class->SetComponentType(java_lang_Object.get()); 231 232 // Setup the char class to be used for char[]. 233 SirtRef<mirror::Class> char_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 234 235 // Setup the char[] class to be used for String. 236 SirtRef<mirror::Class> char_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 237 char_array_class->SetComponentType(char_class.get()); 238 mirror::CharArray::SetArrayClass(char_array_class.get()); 239 240 // Setup String. 241 SirtRef<mirror::Class> java_lang_String(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::StringClass))); 242 mirror::String::SetClass(java_lang_String.get()); 243 java_lang_String->SetObjectSize(sizeof(mirror::String)); 244 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 245 246 // Create storage for root classes, save away our work so far (requires descriptors). 247 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.get(), 248 kClassRootsMax); 249 CHECK(class_roots_ != NULL); 250 SetClassRoot(kJavaLangClass, java_lang_Class.get()); 251 SetClassRoot(kJavaLangObject, java_lang_Object.get()); 252 SetClassRoot(kClassArrayClass, class_array_class.get()); 253 SetClassRoot(kObjectArrayClass, object_array_class.get()); 254 SetClassRoot(kCharArrayClass, char_array_class.get()); 255 SetClassRoot(kJavaLangString, java_lang_String.get()); 256 257 // Setup the primitive type classes. 258 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 259 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 260 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 261 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 262 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 263 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 264 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 265 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 266 267 // Create array interface entries to populate once we can load system classes. 268 array_iftable_ = AllocIfTable(self, 2); 269 270 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 271 SirtRef<mirror::Class> int_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 272 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 273 mirror::IntArray::SetArrayClass(int_array_class.get()); 274 SetClassRoot(kIntArrayClass, int_array_class.get()); 275 276 // now that these are registered, we can use AllocClass() and AllocObjectArray 277 278 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 279 SirtRef<mirror::Class> 280 java_lang_DexCache(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::DexCacheClass))); 281 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.get()); 282 java_lang_DexCache->SetObjectSize(sizeof(mirror::DexCache)); 283 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 284 285 // Constructor, Field, Method, and AbstractMethod are necessary so that FindClass can link members. 286 SirtRef<mirror::Class> java_lang_reflect_ArtField(self, AllocClass(self, java_lang_Class.get(), 287 sizeof(mirror::ArtFieldClass))); 288 CHECK(java_lang_reflect_ArtField.get() != NULL); 289 java_lang_reflect_ArtField->SetObjectSize(sizeof(mirror::ArtField)); 290 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.get()); 291 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 292 mirror::ArtField::SetClass(java_lang_reflect_ArtField.get()); 293 294 SirtRef<mirror::Class> java_lang_reflect_ArtMethod(self, AllocClass(self, java_lang_Class.get(), 295 sizeof(mirror::ArtMethodClass))); 296 CHECK(java_lang_reflect_ArtMethod.get() != NULL); 297 java_lang_reflect_ArtMethod->SetObjectSize(sizeof(mirror::ArtMethod)); 298 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.get()); 299 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 300 301 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.get()); 302 303 // Set up array classes for string, field, method 304 SirtRef<mirror::Class> object_array_string(self, AllocClass(self, java_lang_Class.get(), 305 sizeof(mirror::Class))); 306 object_array_string->SetComponentType(java_lang_String.get()); 307 SetClassRoot(kJavaLangStringArrayClass, object_array_string.get()); 308 309 SirtRef<mirror::Class> object_array_art_method(self, AllocClass(self, java_lang_Class.get(), 310 sizeof(mirror::Class))); 311 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.get()); 312 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.get()); 313 314 SirtRef<mirror::Class> object_array_art_field(self, AllocClass(self, java_lang_Class.get(), 315 sizeof(mirror::Class))); 316 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.get()); 317 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.get()); 318 319 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 320 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 321 // these roots. 322 CHECK_NE(0U, boot_class_path.size()); 323 for (size_t i = 0; i != boot_class_path.size(); ++i) { 324 const DexFile* dex_file = boot_class_path[i]; 325 CHECK(dex_file != NULL); 326 AppendToBootClassPath(*dex_file); 327 } 328 329 // now we can use FindSystemClass 330 331 // run char class through InitializePrimitiveClass to finish init 332 InitializePrimitiveClass(char_class.get(), Primitive::kPrimChar); 333 SetClassRoot(kPrimitiveChar, char_class.get()); // needs descriptor 334 335 // Create runtime resolution and imt conflict methods. Also setup the default imt. 336 Runtime* runtime = Runtime::Current(); 337 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 338 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 339 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 340 341 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 342 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 343 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 344 CHECK_EQ(java_lang_Object.get(), Object_class); 345 CHECK_EQ(java_lang_Object->GetObjectSize(), sizeof(mirror::Object)); 346 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 347 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 348 CHECK_EQ(java_lang_String.get(), String_class); 349 CHECK_EQ(java_lang_String->GetObjectSize(), sizeof(mirror::String)); 350 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 351 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 352 CHECK_EQ(java_lang_String.get(), String_class); 353 CHECK_EQ(java_lang_DexCache.get(), DexCache_class); 354 CHECK_EQ(java_lang_DexCache->GetObjectSize(), sizeof(mirror::DexCache)); 355 356 // Setup the primitive array type classes - can't be done until Object has a vtable. 357 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 358 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 359 360 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 361 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 362 363 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 364 CHECK_EQ(char_array_class.get(), found_char_array_class); 365 366 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 367 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 368 369 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 370 CHECK_EQ(int_array_class.get(), found_int_array_class); 371 372 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 373 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 374 375 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 376 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 377 378 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 379 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 380 381 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 382 CHECK_EQ(class_array_class.get(), found_class_array_class); 383 384 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 385 CHECK_EQ(object_array_class.get(), found_object_array_class); 386 387 // Setup the single, global copy of "iftable". 388 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 389 CHECK(java_lang_Cloneable != NULL); 390 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 391 CHECK(java_io_Serializable != NULL); 392 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 393 // crawl up and explicitly list all of the supers as well. 394 array_iftable_->SetInterface(0, java_lang_Cloneable); 395 array_iftable_->SetInterface(1, java_io_Serializable); 396 397 // Sanity check Class[] and Object[]'s interfaces. 398 ClassHelper kh(class_array_class.get()); 399 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 400 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 401 kh.ChangeClass(object_array_class.get()); 402 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 403 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 404 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 405 // dex_cache_ fields and register them in class_table_. 406 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 407 CHECK_EQ(java_lang_Class.get(), Class_class); 408 409 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 410 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 411 CHECK_EQ(java_lang_reflect_ArtMethod.get(), Art_method_class); 412 413 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 414 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 415 CHECK_EQ(java_lang_reflect_ArtField.get(), Art_field_class); 416 417 mirror::Class* String_array_class = FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 418 CHECK_EQ(object_array_string.get(), String_array_class); 419 420 mirror::Class* Art_method_array_class = 421 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 422 CHECK_EQ(object_array_art_method.get(), Art_method_array_class); 423 424 mirror::Class* Art_field_array_class = 425 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 426 CHECK_EQ(object_array_art_field.get(), Art_field_array_class); 427 428 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 429 430 // Create java.lang.reflect.Proxy root. 431 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 432 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 433 434 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 435 mirror::Class* java_lang_ref_Reference = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 436 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference); 437 mirror::Class* java_lang_ref_FinalizerReference = FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 438 java_lang_ref_FinalizerReference->SetAccessFlags( 439 java_lang_ref_FinalizerReference->GetAccessFlags() | 440 kAccClassIsReference | kAccClassIsFinalizerReference); 441 mirror::Class* java_lang_ref_PhantomReference = FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 442 java_lang_ref_PhantomReference->SetAccessFlags( 443 java_lang_ref_PhantomReference->GetAccessFlags() | 444 kAccClassIsReference | kAccClassIsPhantomReference); 445 mirror::Class* java_lang_ref_SoftReference = FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 446 java_lang_ref_SoftReference->SetAccessFlags( 447 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 448 mirror::Class* java_lang_ref_WeakReference = FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 449 java_lang_ref_WeakReference->SetAccessFlags( 450 java_lang_ref_WeakReference->GetAccessFlags() | 451 kAccClassIsReference | kAccClassIsWeakReference); 452 453 // Setup the ClassLoader, verifying the object_size_. 454 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 455 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), sizeof(mirror::ClassLoader)); 456 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 457 458 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 459 // java.lang.StackTraceElement as a convenience. 460 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 461 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 462 SetClassRoot(kJavaLangClassNotFoundException, FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 463 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 464 SetClassRoot(kJavaLangStackTraceElementArrayClass, FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 465 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 466 467 FinishInit(self); 468 469 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 470} 471 472void ClassLinker::FinishInit(Thread* self) { 473 VLOG(startup) << "ClassLinker::FinishInit entering"; 474 475 // Let the heap know some key offsets into java.lang.ref instances 476 // Note: we hard code the field indexes here rather than using FindInstanceField 477 // as the types of the field can't be resolved prior to the runtime being 478 // fully initialized 479 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 480 mirror::Class* java_lang_ref_FinalizerReference = 481 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 482 483 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 484 FieldHelper fh(pendingNext); 485 CHECK_STREQ(fh.GetName(), "pendingNext"); 486 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 487 488 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 489 fh.ChangeField(queue); 490 CHECK_STREQ(fh.GetName(), "queue"); 491 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 492 493 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 494 fh.ChangeField(queueNext); 495 CHECK_STREQ(fh.GetName(), "queueNext"); 496 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 497 498 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 499 fh.ChangeField(referent); 500 CHECK_STREQ(fh.GetName(), "referent"); 501 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 502 503 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 504 fh.ChangeField(zombie); 505 CHECK_STREQ(fh.GetName(), "zombie"); 506 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 507 508 // ensure all class_roots_ are initialized 509 for (size_t i = 0; i < kClassRootsMax; i++) { 510 ClassRoot class_root = static_cast<ClassRoot>(i); 511 mirror::Class* klass = GetClassRoot(class_root); 512 CHECK(klass != NULL); 513 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 514 // note SetClassRoot does additional validation. 515 // if possible add new checks there to catch errors early 516 } 517 518 CHECK(array_iftable_ != NULL); 519 520 // disable the slow paths in FindClass and CreatePrimitiveClass now 521 // that Object, Class, and Object[] are setup 522 init_done_ = true; 523 524 VLOG(startup) << "ClassLinker::FinishInit exiting"; 525} 526 527void ClassLinker::RunRootClinits() { 528 Thread* self = Thread::Current(); 529 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 530 mirror::Class* c = GetClassRoot(ClassRoot(i)); 531 if (!c->IsArrayClass() && !c->IsPrimitive()) { 532 SirtRef<mirror::Class> sirt_class(self, GetClassRoot(ClassRoot(i))); 533 EnsureInitialized(sirt_class, true, true); 534 self->AssertNoPendingException(); 535 } 536 } 537} 538 539bool ClassLinker::GenerateOatFile(const char* dex_filename, 540 int oat_fd, 541 const char* oat_cache_filename, 542 std::string* error_msg) { 543 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 544 std::string dex2oat(GetAndroidRoot()); 545 dex2oat += (kIsDebugBuild ? "/bin/dex2oatd" : "/bin/dex2oat"); 546 547 gc::Heap* heap = Runtime::Current()->GetHeap(); 548 std::string boot_image_option("--boot-image="); 549 boot_image_option += heap->GetImageSpace()->GetImageFilename(); 550 551 std::string dex_file_option("--dex-file="); 552 dex_file_option += dex_filename; 553 554 std::string oat_fd_option("--oat-fd="); 555 StringAppendF(&oat_fd_option, "%d", oat_fd); 556 557 std::string oat_location_option("--oat-location="); 558 oat_location_option += oat_cache_filename; 559 560 std::vector<std::string> argv; 561 argv.push_back(dex2oat); 562 argv.push_back("--runtime-arg"); 563 argv.push_back("-Xms64m"); 564 argv.push_back("--runtime-arg"); 565 argv.push_back("-Xmx64m"); 566 argv.push_back("--runtime-arg"); 567 argv.push_back("-classpath"); 568 argv.push_back("--runtime-arg"); 569 argv.push_back(Runtime::Current()->GetClassPathString()); 570 571 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 572 573 if (!Runtime::Current()->IsVerificationEnabled()) { 574 argv.push_back("--compiler-filter=verify-none"); 575 } 576 577 if (!kIsTargetBuild) { 578 argv.push_back("--host"); 579 } 580 581 argv.push_back(boot_image_option); 582 argv.push_back(dex_file_option); 583 argv.push_back(oat_fd_option); 584 argv.push_back(oat_location_option); 585 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 586 for (size_t i = 0; i < compiler_options.size(); ++i) { 587 argv.push_back(compiler_options[i].c_str()); 588 } 589 590 return Exec(argv, error_msg); 591} 592 593const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 594 WriterMutexLock mu(Thread::Current(), dex_lock_); 595 if (kIsDebugBuild) { 596 for (size_t i = 0; i < oat_files_.size(); ++i) { 597 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 598 } 599 } 600 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 601 oat_files_.push_back(oat_file); 602 return oat_file; 603} 604 605OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 606 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 607 OatFile* oat_file = space->ReleaseOatFile(); 608 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 609 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 610 return *oat_file; 611} 612 613const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 614 const char* dex_location = dex_file.GetLocation().c_str(); 615 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 616 return FindOpenedOatFileFromDexLocation(dex_location, &dex_location_checksum); 617} 618 619const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation(const char* dex_location, 620 const uint32_t* const dex_location_checksum) { 621 ReaderMutexLock mu(Thread::Current(), dex_lock_); 622 for (size_t i = 0; i < oat_files_.size(); i++) { 623 const OatFile* oat_file = oat_files_[i]; 624 DCHECK(oat_file != NULL); 625 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 626 dex_location_checksum, 627 false); 628 if (oat_dex_file != NULL) { 629 return oat_file; 630 } 631 } 632 return NULL; 633} 634 635const DexFile* ClassLinker::FindDexFileInOatLocation(const char* dex_location, 636 uint32_t dex_location_checksum, 637 const char* oat_location, 638 std::string* error_msg) { 639 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 640 !Runtime::Current()->IsCompiler(), 641 error_msg)); 642 if (oat_file.get() == nullptr) { 643 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 644 error_msg->c_str()); 645 return nullptr; 646 } 647 Runtime* runtime = Runtime::Current(); 648 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 649 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 650 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 651 if (expected_image_oat_checksum != actual_image_oat_checksum) { 652 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 653 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 654 actual_image_oat_checksum); 655 return nullptr; 656 } 657 658 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 659 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 660 if (expected_image_oat_offset != actual_image_oat_offset) { 661 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 662 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 663 actual_image_oat_offset); 664 return nullptr; 665 } 666 // TODO: this registers the oat file now as we may use the oat_dex_file later and we want the 667 // intern behavior of RegisterOatFile. However, if we take an early return we could remove 668 // the oat file. 669 const OatFile* opened_oat_file = RegisterOatFile(oat_file.release()); 670 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, 671 &dex_location_checksum); 672 if (oat_dex_file == nullptr) { 673 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 674 dex_location); 675 return nullptr; 676 } 677 uint32_t expected_dex_checksum = dex_location_checksum; 678 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 679 if (expected_dex_checksum != actual_dex_checksum) { 680 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 681 "found 0x%x", oat_location, expected_dex_checksum, 682 actual_dex_checksum); 683 return nullptr; 684 } 685 return oat_dex_file->OpenDexFile(error_msg); 686} 687 688class ScopedFlock { 689 public: 690 ScopedFlock() {} 691 692 bool Init(const char* filename, std::string* error_msg) { 693 while (true) { 694 file_.reset(OS::OpenFileWithFlags(filename, O_CREAT | O_RDWR)); 695 if (file_.get() == NULL) { 696 *error_msg = StringPrintf("Failed to open file '%s': %s", filename, strerror(errno)); 697 return false; 698 } 699 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_EX)); 700 if (flock_result != 0) { 701 *error_msg = StringPrintf("Failed to lock file '%s': %s", filename, strerror(errno)); 702 return false; 703 } 704 struct stat fstat_stat; 705 int fstat_result = TEMP_FAILURE_RETRY(fstat(file_->Fd(), &fstat_stat)); 706 if (fstat_result != 0) { 707 *error_msg = StringPrintf("Failed to fstat file '%s': %s", filename, strerror(errno)); 708 return false; 709 } 710 struct stat stat_stat; 711 int stat_result = TEMP_FAILURE_RETRY(stat(filename, &stat_stat)); 712 if (stat_result != 0) { 713 PLOG(WARNING) << "Failed to stat, will retry: " << filename; 714 // ENOENT can happen if someone racing with us unlinks the file we created so just retry. 715 continue; 716 } 717 if (fstat_stat.st_dev != stat_stat.st_dev || fstat_stat.st_ino != stat_stat.st_ino) { 718 LOG(WARNING) << "File changed while locking, will retry: " << filename; 719 continue; 720 } 721 return true; 722 } 723 } 724 725 File& GetFile() { 726 return *file_; 727 } 728 729 ~ScopedFlock() { 730 if (file_.get() != NULL) { 731 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_UN)); 732 CHECK_EQ(0, flock_result); 733 } 734 } 735 736 private: 737 UniquePtr<File> file_; 738 739 DISALLOW_COPY_AND_ASSIGN(ScopedFlock); 740}; 741 742const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation(const char* dex_location, 743 uint32_t dex_location_checksum, 744 const char* oat_location, 745 std::vector<std::string>* error_msgs) { 746 // We play a locking game here so that if two different processes 747 // race to generate (or worse, one tries to open a partial generated 748 // file) we will be okay. This is actually common with apps that use 749 // DexClassLoader to work around the dex method reference limit and 750 // that have a background service running in a separate process. 751 ScopedFlock scoped_flock; 752 std::string error_msg; 753 if (!scoped_flock.Init(oat_location, &error_msg)) { 754 error_msgs->push_back(error_msg); 755 return nullptr; 756 } 757 758 // Check if we already have an up-to-date output file 759 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, dex_location_checksum, 760 oat_location, &error_msg); 761 if (dex_file != nullptr) { 762 return dex_file; 763 } 764 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 765 dex_location, oat_location, error_msg.c_str()); 766 VLOG(class_linker) << compound_msg; 767 error_msgs->push_back(compound_msg); 768 769 // Generate the output oat file for the dex file 770 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 771 if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location, &error_msg)) { 772 CHECK(!error_msg.empty()); 773 error_msgs->push_back(error_msg); 774 return nullptr; 775 } 776 const OatFile* oat_file = OatFile::Open(oat_location, oat_location, NULL, 777 !Runtime::Current()->IsCompiler(), 778 &error_msg); 779 if (oat_file == nullptr) { 780 compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 781 oat_location, error_msg.c_str()); 782 error_msgs->push_back(compound_msg); 783 return nullptr; 784 } 785 oat_file = RegisterOatFile(oat_file); 786 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 787 &dex_location_checksum); 788 if (oat_dex_file == nullptr) { 789 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out file " 790 "'%s'", dex_location, dex_location_checksum, oat_location); 791 error_msgs->push_back(error_msg); 792 return nullptr; 793 } 794 const DexFile* result = oat_dex_file->OpenDexFile(&error_msg); 795 CHECK(result != nullptr) << error_msgs << ", " << error_msg; 796 CHECK_EQ(dex_location_checksum, result->GetLocationChecksum()) 797 << "dex_location=" << dex_location << " oat_location=" << oat_location << std::hex 798 << " dex_location_checksum=" << dex_location_checksum 799 << " DexFile::GetLocationChecksum()=" << result->GetLocationChecksum(); 800 return result; 801} 802 803bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 804 const char* dex_location, 805 uint32_t dex_location_checksum, 806 std::string* error_msg) { 807 Runtime* runtime = Runtime::Current(); 808 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 809 uint32_t image_oat_checksum = image_header.GetOatChecksum(); 810 uintptr_t image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 811 bool image_check = ((oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum) 812 && (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 813 814 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 815 if (oat_dex_file == NULL) { 816 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 817 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 818 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 819 for (size_t i = 0; i < oat_dex_files.size(); i++) { 820 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 821 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 822 oat_file->GetLocation().c_str(), 823 oat_dex_file->GetDexFileLocation().c_str()); 824 } 825 return false; 826 } 827 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 828 829 if (image_check && dex_check) { 830 return true; 831 } 832 833 if (!image_check) { 834 ScopedObjectAccess soa(Thread::Current()); 835 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with (0x%x, %" PRIdPTR ")", 836 oat_file->GetLocation().c_str(), 837 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 838 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 839 image_oat_checksum, image_oat_data_begin); 840 } 841 if (!dex_check) { 842 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 843 oat_file->GetLocation().c_str(), 844 oat_dex_file->GetDexFileLocationChecksum(), 845 dex_location, dex_location_checksum); 846 } 847 return false; 848} 849 850const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const std::string& oat_file_location, 851 const char* dex_location, 852 std::string* error_msg, 853 bool* open_failed) { 854 UniquePtr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 855 if (oat_file.get() == nullptr) { 856 *open_failed = true; 857 return nullptr; 858 } 859 *open_failed = false; 860 uint32_t dex_location_checksum; 861 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 862 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 863 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 864 // directory. 865 const OatFile* opened_oat_file = oat_file.release(); 866 opened_oat_file = RegisterOatFile(opened_oat_file); 867 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, NULL); 868 if (oat_dex_file == nullptr) { 869 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 870 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 871 error_msg->c_str()); 872 return nullptr; 873 } 874 return oat_dex_file->OpenDexFile(error_msg); 875 } 876 877 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 878 error_msg); 879 if (!verified) { 880 return nullptr; 881 } 882 const OatFile* opened_oat_file = oat_file.release(); 883 opened_oat_file = RegisterOatFile(opened_oat_file); 884 return opened_oat_file->GetOatDexFile(dex_location, 885 &dex_location_checksum)->OpenDexFile(error_msg); 886} 887 888const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const char* dex_location, 889 const uint32_t* const dex_location_checksum, 890 std::vector<std::string>* error_msgs) { 891 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location, 892 dex_location_checksum); 893 if (open_oat_file != nullptr) { 894 const OatFile::OatDexFile* oat_dex_file = open_oat_file->GetOatDexFile(dex_location, 895 dex_location_checksum); 896 std::string error_msg; 897 const DexFile* ret = oat_dex_file->OpenDexFile(&error_msg); 898 if (ret == nullptr) { 899 error_msgs->push_back(error_msg); 900 } 901 return ret; 902 } 903 904 // Look for an existing file next to dex. for example, for 905 // /foo/bar/baz.jar, look for /foo/bar/baz.odex. 906 std::string odex_filename(OatFile::DexFilenameToOdexFilename(dex_location)); 907 bool open_failed; 908 std::string error_msg; 909 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(odex_filename, dex_location, 910 &error_msg, &open_failed); 911 if (dex_file != nullptr) { 912 return dex_file; 913 } 914 if (dex_location_checksum == nullptr) { 915 error_msgs->push_back(StringPrintf("Failed to open oat file from %s and no classes.dex found in" 916 "%s: %s", odex_filename.c_str(), dex_location, 917 error_msg.c_str())); 918 return nullptr; 919 } 920 921 std::string cache_error_msg; 922 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location)); 923 dex_file = VerifyAndOpenDexFileFromOatFile(cache_location, dex_location, &cache_error_msg, 924 &open_failed); 925 if (dex_file != nullptr) { 926 return dex_file; 927 } 928 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 929 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 930 } 931 std::string compound_msg = StringPrintf("Failed to open oat file from %s (error '%s') or %s " 932 "(error '%s').", odex_filename.c_str(), error_msg.c_str(), 933 cache_location.c_str(), cache_error_msg.c_str()); 934 VLOG(class_linker) << compound_msg; 935 error_msgs->push_back(compound_msg); 936 937 // Try to generate oat file if it wasn't found or was obsolete. 938 return FindOrCreateOatFileForDexLocation(dex_location, *dex_location_checksum, 939 cache_location.c_str(), error_msgs); 940} 941 942const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 943 ReaderMutexLock mu(Thread::Current(), dex_lock_); 944 for (size_t i = 0; i < oat_files_.size(); i++) { 945 const OatFile* oat_file = oat_files_[i]; 946 DCHECK(oat_file != nullptr); 947 if (oat_file->GetLocation() == oat_location) { 948 return oat_file; 949 } 950 } 951 return nullptr; 952} 953 954const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 955 std::string* error_msg) { 956 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 957 if (oat_file != nullptr) { 958 return oat_file; 959 } 960 961 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 962 error_msg); 963 if (oat_file == NULL) { 964 return NULL; 965 } 966 return oat_file; 967} 968 969static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 970 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 971 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 972 973 DCHECK(obj != NULL); 974 DCHECK(class_linker != NULL); 975 976 if (obj->IsArtMethod()) { 977 mirror::ArtMethod* method = obj->AsArtMethod(); 978 if (!method->IsNative()) { 979 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 980 if (method != Runtime::Current()->GetResolutionMethod()) { 981 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 982 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 983 } 984 } 985 } 986} 987 988void ClassLinker::InitFromImage() { 989 VLOG(startup) << "ClassLinker::InitFromImage entering"; 990 CHECK(!init_done_); 991 992 Thread* self = Thread::Current(); 993 gc::Heap* heap = Runtime::Current()->GetHeap(); 994 gc::space::ImageSpace* space = heap->GetImageSpace(); 995 dex_cache_image_class_lookup_required_ = true; 996 CHECK(space != NULL); 997 OatFile& oat_file = GetImageOatFile(space); 998 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 999 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1000 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 1001 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1002 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1003 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1004 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1005 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1006 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1007 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1008 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1009 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1010 1011 SirtRef<mirror::ObjectArray<mirror::Class> > class_roots( 1012 self, 1013 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>()); 1014 class_roots_ = class_roots.get(); 1015 1016 // Special case of setting up the String class early so that we can test arbitrary objects 1017 // as being Strings or not 1018 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1019 1020 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1021 static_cast<uint32_t>(dex_caches->GetLength())); 1022 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1023 SirtRef<mirror::DexCache> dex_cache(self, dex_caches->Get(i)); 1024 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1025 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1026 nullptr); 1027 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1028 std::string error_msg; 1029 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1030 if (dex_file == NULL) { 1031 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1032 << " from within oat file " << oat_file.GetLocation() 1033 << " error '" << error_msg << "'"; 1034 } 1035 1036 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1037 1038 AppendToBootClassPath(*dex_file, dex_cache); 1039 } 1040 1041 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1042 // bitmap walk. 1043 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1044 1045 // Set entry point to interpreter if in InterpretOnly mode. 1046 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1047 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1048 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1049 } 1050 1051 // reinit class_roots_ 1052 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1053 class_roots_ = class_roots.get(); 1054 1055 // reinit array_iftable_ from any array class instance, they should be == 1056 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1057 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1058 // String class root was set above 1059 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1060 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1061 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1062 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1063 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1064 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1065 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1066 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1067 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1068 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1069 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1070 1071 FinishInit(self); 1072 1073 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1074} 1075 1076// Keep in sync with InitCallback. Anything we visit, we need to 1077// reinit references to when reinitializing a ClassLinker from a 1078// mapped image. 1079void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1080 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1081 Thread* self = Thread::Current(); 1082 { 1083 ReaderMutexLock mu(self, dex_lock_); 1084 if ((flags & kVisitRootFlagAllRoots) != 0) { 1085 for (mirror::DexCache*& dex_cache : dex_caches_) { 1086 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1087 } 1088 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1089 for (size_t index : new_dex_cache_roots_) { 1090 callback(reinterpret_cast<mirror::Object**>(&dex_caches_[index]), arg, 0, kRootVMInternal); 1091 } 1092 } 1093 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1094 new_dex_cache_roots_.clear(); 1095 } 1096 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1097 log_new_dex_caches_roots_ = true; 1098 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1099 log_new_dex_caches_roots_ = false; 1100 } 1101 } 1102 { 1103 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 1104 if ((flags & kVisitRootFlagAllRoots) != 0) { 1105 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1106 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1107 } 1108 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1109 for (auto& pair : new_class_roots_) { 1110 mirror::Object* old_ref = pair.second; 1111 callback(reinterpret_cast<mirror::Object**>(&pair.second), arg, 0, kRootStickyClass); 1112 if (UNLIKELY(pair.second != old_ref)) { 1113 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1114 // corresponding object. This is slow, but luckily for us, this may only happen with a 1115 // concurrent moving GC. 1116 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1117 it != end && it->first == pair.first; ++it) { 1118 // If the class stored matches the old class, update it to the new value. 1119 if (old_ref == it->second) { 1120 it->second = pair.second; 1121 } 1122 } 1123 } 1124 } 1125 } 1126 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1127 new_class_roots_.clear(); 1128 } 1129 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1130 log_new_class_table_roots_ = true; 1131 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1132 log_new_class_table_roots_ = false; 1133 } 1134 // We deliberately ignore the class roots in the image since we 1135 // handle image roots by using the MS/CMS rescanning of dirty cards. 1136 } 1137 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1138 DCHECK(array_iftable_ != nullptr); 1139 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1140 if (find_array_class_cache_[i] != nullptr) { 1141 callback(reinterpret_cast<mirror::Object**>(&find_array_class_cache_[i]), arg, 0, 1142 kRootVMInternal); 1143 } 1144 } 1145} 1146 1147void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1148 if (dex_cache_image_class_lookup_required_) { 1149 MoveImageClassesToClassTable(); 1150 } 1151 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1152 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 1153 if (!visitor(it.second, arg)) { 1154 return; 1155 } 1156 } 1157} 1158 1159static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1160 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1161 classes->insert(c); 1162 return true; 1163} 1164 1165void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1166 std::set<mirror::Class*> classes; 1167 VisitClasses(GetClassesVisitor, &classes); 1168 for (mirror::Class* klass : classes) { 1169 if (!visitor(klass, arg)) { 1170 return; 1171 } 1172 } 1173} 1174 1175ClassLinker::~ClassLinker() { 1176 mirror::Class::ResetClass(); 1177 mirror::String::ResetClass(); 1178 mirror::ArtField::ResetClass(); 1179 mirror::ArtMethod::ResetClass(); 1180 mirror::BooleanArray::ResetArrayClass(); 1181 mirror::ByteArray::ResetArrayClass(); 1182 mirror::CharArray::ResetArrayClass(); 1183 mirror::DoubleArray::ResetArrayClass(); 1184 mirror::FloatArray::ResetArrayClass(); 1185 mirror::IntArray::ResetArrayClass(); 1186 mirror::LongArray::ResetArrayClass(); 1187 mirror::ShortArray::ResetArrayClass(); 1188 mirror::Throwable::ResetClass(); 1189 mirror::StackTraceElement::ResetClass(); 1190 STLDeleteElements(&boot_class_path_); 1191 STLDeleteElements(&oat_files_); 1192} 1193 1194mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1195 gc::Heap* heap = Runtime::Current()->GetHeap(); 1196 SirtRef<mirror::Class> dex_cache_class(self, GetClassRoot(kJavaLangDexCache)); 1197 SirtRef<mirror::DexCache> dex_cache( 1198 self, down_cast<mirror::DexCache*>( 1199 heap->AllocObject<true>(self, dex_cache_class.get(), dex_cache_class->GetObjectSize(), 1200 VoidFunctor()))); 1201 if (dex_cache.get() == NULL) { 1202 return NULL; 1203 } 1204 SirtRef<mirror::String> 1205 location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str())); 1206 if (location.get() == NULL) { 1207 return NULL; 1208 } 1209 SirtRef<mirror::ObjectArray<mirror::String> > 1210 strings(self, AllocStringArray(self, dex_file.NumStringIds())); 1211 if (strings.get() == NULL) { 1212 return NULL; 1213 } 1214 SirtRef<mirror::ObjectArray<mirror::Class> > 1215 types(self, AllocClassArray(self, dex_file.NumTypeIds())); 1216 if (types.get() == NULL) { 1217 return NULL; 1218 } 1219 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 1220 methods(self, AllocArtMethodArray(self, dex_file.NumMethodIds())); 1221 if (methods.get() == NULL) { 1222 return NULL; 1223 } 1224 SirtRef<mirror::ObjectArray<mirror::ArtField> > 1225 fields(self, AllocArtFieldArray(self, dex_file.NumFieldIds())); 1226 if (fields.get() == NULL) { 1227 return NULL; 1228 } 1229 dex_cache->Init(&dex_file, location.get(), strings.get(), types.get(), methods.get(), 1230 fields.get()); 1231 return dex_cache.get(); 1232} 1233 1234// Used to initialize a class in the allocation code path to ensure it is guarded by a StoreStore 1235// fence. 1236class InitializeClassVisitor { 1237 public: 1238 explicit InitializeClassVisitor(uint32_t class_size) : class_size_(class_size) { 1239 } 1240 1241 void operator()(mirror::Object* obj, size_t usable_size) const 1242 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1243 DCHECK_LE(class_size_, usable_size); 1244 // Avoid AsClass as object is not yet in live bitmap or allocation stack. 1245 mirror::Class* klass = down_cast<mirror::Class*>(obj); 1246 // DCHECK(klass->IsClass()); 1247 klass->SetClassSize(class_size_); 1248 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1249 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1250 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1251 } 1252 1253 private: 1254 const uint32_t class_size_; 1255 1256 DISALLOW_COPY_AND_ASSIGN(InitializeClassVisitor); 1257}; 1258 1259mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1260 uint32_t class_size) { 1261 DCHECK_GE(class_size, sizeof(mirror::Class)); 1262 gc::Heap* heap = Runtime::Current()->GetHeap(); 1263 InitializeClassVisitor visitor(class_size); 1264 mirror::Object* k = 1265 kMovingClasses ? heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) 1266 : heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1267 if (UNLIKELY(k == nullptr)) { 1268 CHECK(self->IsExceptionPending()); // OOME. 1269 return nullptr; 1270 } 1271 return k->AsClass(); 1272} 1273 1274mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1275 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1276} 1277 1278mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1279 return down_cast<mirror::ArtField*>( 1280 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1281} 1282 1283mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1284 return down_cast<mirror::ArtMethod*>( 1285 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1286} 1287 1288mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1289 Thread* self, size_t length) { 1290 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1291 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1292} 1293 1294static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1295 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1296 DCHECK(klass != NULL); 1297 // Wait for the class if it has not already been linked. 1298 if (!klass->IsResolved() && !klass->IsErroneous()) { 1299 SirtRef<mirror::Class> sirt_class(self, klass); 1300 ObjectLock<mirror::Class> lock(self, &sirt_class); 1301 // Check for circular dependencies between classes. 1302 if (!sirt_class->IsResolved() && sirt_class->GetClinitThreadId() == self->GetTid()) { 1303 ThrowClassCircularityError(sirt_class.get()); 1304 sirt_class->SetStatus(mirror::Class::kStatusError, self); 1305 return nullptr; 1306 } 1307 // Wait for the pending initialization to complete. 1308 while (!sirt_class->IsResolved() && !sirt_class->IsErroneous()) { 1309 lock.WaitIgnoringInterrupts(); 1310 } 1311 klass = sirt_class.get(); 1312 } 1313 if (klass->IsErroneous()) { 1314 ThrowEarlierClassFailure(klass); 1315 return nullptr; 1316 } 1317 // Return the loaded class. No exceptions should be pending. 1318 CHECK(klass->IsResolved()) << PrettyClass(klass); 1319 self->AssertNoPendingException(); 1320 return klass; 1321} 1322 1323mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1324 const SirtRef<mirror::ClassLoader>& class_loader) { 1325 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1326 DCHECK(self != nullptr); 1327 self->AssertNoPendingException(); 1328 if (descriptor[1] == '\0') { 1329 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1330 // for primitive classes that aren't backed by dex files. 1331 return FindPrimitiveClass(descriptor[0]); 1332 } 1333 // Find the class in the loaded classes table. 1334 mirror::Class* klass = LookupClass(descriptor, class_loader.get()); 1335 if (klass != NULL) { 1336 return EnsureResolved(self, klass); 1337 } 1338 // Class is not yet loaded. 1339 if (descriptor[0] == '[') { 1340 return CreateArrayClass(self, descriptor, class_loader); 1341 } else if (class_loader.get() == nullptr) { 1342 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1343 if (pair.second != NULL) { 1344 SirtRef<mirror::ClassLoader> class_loader(self, nullptr); 1345 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1346 } 1347 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1348 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1349 // throw of a NoClassDefFoundError. 1350 if (IsInBootClassPath(descriptor)) { 1351 mirror::Class* system_class = FindSystemClass(self, descriptor); 1352 CHECK(system_class != NULL); 1353 return system_class; 1354 } 1355 // Next try the compile time class path. 1356 const std::vector<const DexFile*>* class_path; 1357 { 1358 ScopedObjectAccessUnchecked soa(self); 1359 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1360 soa.AddLocalReference<jobject>(class_loader.get())); 1361 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1362 } 1363 1364 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1365 if (pair.second != NULL) { 1366 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1367 } 1368 1369 } else { 1370 ScopedObjectAccessUnchecked soa(self); 1371 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1372 soa.AddLocalReference<jobject>(class_loader.get())); 1373 std::string class_name_string(DescriptorToDot(descriptor)); 1374 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1375 { 1376 ScopedThreadStateChange tsc(self, kNative); 1377 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1378 soa.Env()->NewStringUTF(class_name_string.c_str())); 1379 if (class_name_object.get() == NULL) { 1380 return NULL; 1381 } 1382 CHECK(class_loader_object.get() != NULL); 1383 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1384 WellKnownClasses::java_lang_ClassLoader_loadClass, 1385 class_name_object.get())); 1386 } 1387 if (self->IsExceptionPending()) { 1388 // If the ClassLoader threw, pass that exception up. 1389 return NULL; 1390 } else if (result.get() == NULL) { 1391 // broken loader - throw NPE to be compatible with Dalvik 1392 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1393 class_name_string.c_str()).c_str()); 1394 return NULL; 1395 } else { 1396 // success, return mirror::Class* 1397 return soa.Decode<mirror::Class*>(result.get()); 1398 } 1399 } 1400 1401 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1402 return NULL; 1403} 1404 1405mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1406 const SirtRef<mirror::ClassLoader>& class_loader, 1407 const DexFile& dex_file, 1408 const DexFile::ClassDef& dex_class_def) { 1409 Thread* self = Thread::Current(); 1410 SirtRef<mirror::Class> klass(self, NULL); 1411 // Load the class from the dex file. 1412 if (UNLIKELY(!init_done_)) { 1413 // finish up init of hand crafted class_roots_ 1414 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1415 klass.reset(GetClassRoot(kJavaLangObject)); 1416 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1417 klass.reset(GetClassRoot(kJavaLangClass)); 1418 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1419 klass.reset(GetClassRoot(kJavaLangString)); 1420 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1421 klass.reset(GetClassRoot(kJavaLangDexCache)); 1422 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1423 klass.reset(GetClassRoot(kJavaLangReflectArtField)); 1424 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1425 klass.reset(GetClassRoot(kJavaLangReflectArtMethod)); 1426 } else { 1427 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1428 } 1429 } else { 1430 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1431 } 1432 if (UNLIKELY(klass.get() == NULL)) { 1433 CHECK(self->IsExceptionPending()); // Expect an OOME. 1434 return NULL; 1435 } 1436 klass->SetDexCache(FindDexCache(dex_file)); 1437 LoadClass(dex_file, dex_class_def, klass, class_loader.get()); 1438 // Check for a pending exception during load 1439 if (self->IsExceptionPending()) { 1440 klass->SetStatus(mirror::Class::kStatusError, self); 1441 return NULL; 1442 } 1443 ObjectLock<mirror::Class> lock(self, &klass); 1444 klass->SetClinitThreadId(self->GetTid()); 1445 // Add the newly loaded class to the loaded classes table. 1446 mirror::Class* existing = InsertClass(descriptor, klass.get(), Hash(descriptor)); 1447 if (existing != NULL) { 1448 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1449 // this thread to block. 1450 return EnsureResolved(self, existing); 1451 } 1452 // Finish loading (if necessary) by finding parents 1453 CHECK(!klass->IsLoaded()); 1454 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1455 // Loading failed. 1456 klass->SetStatus(mirror::Class::kStatusError, self); 1457 return NULL; 1458 } 1459 CHECK(klass->IsLoaded()); 1460 // Link the class (if necessary) 1461 CHECK(!klass->IsResolved()); 1462 // TODO: Use fast jobjects? 1463 SirtRef<mirror::ObjectArray<mirror::Class> > interfaces(self, nullptr); 1464 if (!LinkClass(self, klass, interfaces)) { 1465 // Linking failed. 1466 klass->SetStatus(mirror::Class::kStatusError, self); 1467 return NULL; 1468 } 1469 CHECK(klass->IsResolved()); 1470 1471 /* 1472 * We send CLASS_PREPARE events to the debugger from here. The 1473 * definition of "preparation" is creating the static fields for a 1474 * class and initializing them to the standard default values, but not 1475 * executing any code (that comes later, during "initialization"). 1476 * 1477 * We did the static preparation in LinkClass. 1478 * 1479 * The class has been prepared and resolved but possibly not yet verified 1480 * at this point. 1481 */ 1482 Dbg::PostClassPrepare(klass.get()); 1483 1484 return klass.get(); 1485} 1486 1487// Precomputes size that will be needed for Class, matching LinkStaticFields 1488uint32_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1489 const DexFile::ClassDef& dex_class_def) { 1490 const byte* class_data = dex_file.GetClassData(dex_class_def); 1491 size_t num_ref = 0; 1492 size_t num_32 = 0; 1493 size_t num_64 = 0; 1494 if (class_data != NULL) { 1495 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1496 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1497 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1498 char c = descriptor[0]; 1499 if (c == 'L' || c == '[') { 1500 num_ref++; 1501 } else if (c == 'J' || c == 'D') { 1502 num_64++; 1503 } else { 1504 num_32++; 1505 } 1506 } 1507 } 1508 // start with generic class data 1509 uint32_t size = sizeof(mirror::Class); 1510 // follow with reference fields which must be contiguous at start 1511 size += (num_ref * sizeof(uint32_t)); 1512 // if there are 64-bit fields to add, make sure they are aligned 1513 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1514 if (num_32 != 0) { 1515 // use an available 32-bit field for padding 1516 num_32--; 1517 } 1518 size += sizeof(uint32_t); // either way, we are adding a word 1519 DCHECK_EQ(size, RoundUp(size, 8)); 1520 } 1521 // tack on any 64-bit fields now that alignment is assured 1522 size += (num_64 * sizeof(uint64_t)); 1523 // tack on any remaining 32-bit fields 1524 size += (num_32 * sizeof(uint32_t)); 1525 return size; 1526} 1527 1528OatFile::OatClass ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1529 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1530 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1531 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1532 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1533 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1534 &dex_location_checksum); 1535 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1536 return oat_dex_file->GetOatClass(class_def_idx); 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 DCHECK_EQ(oat_method_index, 1597 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1598 method->GetDeclaringClass()->GetDexClassDefIndex(), 1599 method->GetDexMethodIndex())); 1600 const OatFile::OatClass oat_class = GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1601 declaring_class->GetDexClassDefIndex()); 1602 1603 return oat_class.GetOatMethod(oat_method_index); 1604} 1605 1606// Special case to get oat code without overwriting a trampoline. 1607const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1608 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1609 if (method->IsProxyMethod()) { 1610 return GetQuickProxyInvokeHandler(); 1611 } 1612 const void* result = GetOatMethodFor(method).GetQuickCode(); 1613 if (result == nullptr) { 1614 if (method->IsNative()) { 1615 // No code and native? Use generic trampoline. 1616 result = GetQuickGenericJniTrampoline(); 1617 } else if (method->IsPortableCompiled()) { 1618 // No code? Do we expect portable code? 1619 result = GetQuickToPortableBridge(); 1620 } else { 1621 // No code? You must mean to go into the interpreter. 1622 result = GetQuickToInterpreterBridge(); 1623 } 1624 } 1625 return result; 1626} 1627 1628const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1629 bool* have_portable_code) { 1630 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1631 *have_portable_code = false; 1632 if (method->IsProxyMethod()) { 1633 return GetPortableProxyInvokeHandler(); 1634 } 1635 const OatFile::OatMethod oat_method = GetOatMethodFor(method); 1636 const void* result = oat_method.GetPortableCode(); 1637 if (result == nullptr) { 1638 if (oat_method.GetQuickCode() == nullptr) { 1639 // No code? You must mean to go into the interpreter. 1640 result = GetPortableToInterpreterBridge(); 1641 } else { 1642 // No code? But there's quick code, so use a bridge. 1643 result = GetPortableToQuickBridge(); 1644 } 1645 } else { 1646 *have_portable_code = true; 1647 } 1648 return result; 1649} 1650 1651const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1652 uint32_t method_idx) { 1653 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1654 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1655 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 1656} 1657 1658const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1659 uint32_t method_idx) { 1660 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 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 // May return true for native code, in the case of generic JNI 1671 // DCHECK(!method->IsNative()); 1672 return true; 1673 } 1674#ifdef ART_SEA_IR_MODE 1675 ScopedObjectAccess soa(Thread::Current()); 1676 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1677 LOG(INFO) << "Found " << PrettyMethod(method); 1678 return false; 1679 } 1680#endif 1681 // If interpreter mode is enabled, every method (except native and proxy) must 1682 // be run with interpreter. 1683 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1684 !method->IsNative() && !method->IsProxyMethod(); 1685} 1686 1687void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1688 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1689 if (klass->NumDirectMethods() == 0) { 1690 return; // No direct methods => no static methods. 1691 } 1692 Runtime* runtime = Runtime::Current(); 1693 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1694 return; // OAT file unavailable. 1695 } 1696 ClassHelper kh(klass); 1697 const DexFile& dex_file = kh.GetDexFile(); 1698 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 1699 CHECK(dex_class_def != nullptr); 1700 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1701 // There should always be class data if there were direct methods. 1702 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1703 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 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 // Check whether the method is native, in which case it's generic JNI. 1726 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 1727 quick_code = GetQuickGenericJniTrampoline(); 1728 portable_code = GetPortableToQuickBridge(); 1729 } else { 1730 portable_code = GetPortableToInterpreterBridge(); 1731 quick_code = GetQuickToInterpreterBridge(); 1732 } 1733 } else { 1734 if (portable_code == nullptr) { 1735 portable_code = GetPortableToQuickBridge(); 1736 } else { 1737 have_portable_code = true; 1738 } 1739 if (quick_code == nullptr) { 1740 quick_code = GetQuickToPortableBridge(); 1741 } 1742 } 1743 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1744 have_portable_code); 1745 } 1746 // Ignore virtual methods on the iterator. 1747} 1748 1749static void LinkCode(const SirtRef<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class, 1750 const DexFile& dex_file, uint32_t dex_method_index, uint32_t method_index) 1751 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1752 // Method shouldn't have already been linked. 1753 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1754 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1755 // Every kind of method should at least get an invoke stub from the oat_method. 1756 // non-abstract methods also get their code pointers. 1757 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1758 oat_method.LinkMethod(method.get()); 1759 1760 // Install entry point from interpreter. 1761 Runtime* runtime = Runtime::Current(); 1762 bool enter_interpreter = NeedsInterpreter(method.get(), 1763 method->GetEntryPointFromQuickCompiledCode(), 1764 method->GetEntryPointFromPortableCompiledCode()); 1765 if (enter_interpreter && !method->IsNative()) { 1766 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1767 } else { 1768 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1769 } 1770 1771 if (method->IsAbstract()) { 1772 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1773 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1774 return; 1775 } 1776 1777 bool have_portable_code = false; 1778 if (method->IsStatic() && !method->IsConstructor()) { 1779 // For static methods excluding the class initializer, install the trampoline. 1780 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1781 // after initializing class (see ClassLinker::InitializeClass method). 1782 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline(runtime->GetClassLinker())); 1783 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline(runtime->GetClassLinker())); 1784 } else if (enter_interpreter) { 1785 if (!method->IsNative()) { 1786 // Set entry point from compiled code if there's no code or in interpreter only mode. 1787 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1788 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1789 } else { 1790 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 1791 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1792 } 1793 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1794 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1795 have_portable_code = true; 1796 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1797 } else { 1798 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1799 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1800 } 1801 1802 if (method->IsNative()) { 1803 // Unregistering restores the dlsym lookup stub. 1804 method->UnregisterNative(Thread::Current()); 1805 1806 if (enter_interpreter) { 1807 // We have a native method here without code. Then it should have either the GenericJni 1808 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 1809 DCHECK(method->GetEntryPointFromQuickCompiledCode() == 1810 GetQuickResolutionTrampoline(runtime->GetClassLinker()) 1811 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 1812 1813 DCHECK_EQ(method->GetFrameSizeInBytes<false>(), 0U); 1814 1815 // Fix up method metadata if necessary. 1816 uint32_t s_len; 1817 const char* shorty = dex_file.GetMethodShorty(dex_file.GetMethodId(dex_method_index), &s_len); 1818 uint32_t refs = 1; // Native method always has "this" or class. 1819 for (uint32_t i = 1; i < s_len; ++i) { 1820 if (shorty[i] == 'L') { 1821 refs++; 1822 } 1823 } 1824 size_t sirt_size = StackIndirectReferenceTable::GetAlignedSirtSize(refs); 1825 1826 // Get the generic spill masks and base frame size. 1827 mirror::ArtMethod* callee_save_method = 1828 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 1829 1830 method->SetFrameSizeInBytes(callee_save_method->GetFrameSizeInBytes() + sirt_size); 1831 method->SetCoreSpillMask(callee_save_method->GetCoreSpillMask()); 1832 method->SetFpSpillMask(callee_save_method->GetFpSpillMask()); 1833 } 1834 } 1835 1836 // Allow instrumentation its chance to hijack code. 1837 runtime->GetInstrumentation()->UpdateMethodsCode(method.get(), 1838 method->GetEntryPointFromQuickCompiledCode(), 1839 method->GetEntryPointFromPortableCompiledCode(), 1840 have_portable_code); 1841} 1842 1843void ClassLinker::LoadClass(const DexFile& dex_file, 1844 const DexFile::ClassDef& dex_class_def, 1845 const SirtRef<mirror::Class>& klass, 1846 mirror::ClassLoader* class_loader) { 1847 CHECK(klass.get() != NULL); 1848 CHECK(klass->GetDexCache() != NULL); 1849 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1850 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1851 CHECK(descriptor != NULL); 1852 1853 klass->SetClass(GetClassRoot(kJavaLangClass)); 1854 if (kUseBakerOrBrooksReadBarrier) { 1855 klass->AssertReadBarrierPointer(); 1856 } 1857 uint32_t access_flags = dex_class_def.access_flags_; 1858 // Make sure that none of our runtime-only flags are set. 1859 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1860 klass->SetAccessFlags(access_flags); 1861 klass->SetClassLoader(class_loader); 1862 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1863 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1864 1865 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1866 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1867 1868 const byte* class_data = dex_file.GetClassData(dex_class_def); 1869 if (class_data == NULL) { 1870 return; // no fields or methods - for example a marker interface 1871 } 1872 1873 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1874 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 1875 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 1876 } else { 1877 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 1878 } 1879} 1880 1881void ClassLinker::LoadClassMembers(const DexFile& dex_file, 1882 const byte* class_data, 1883 const SirtRef<mirror::Class>& klass, 1884 mirror::ClassLoader* class_loader, 1885 const OatFile::OatClass* oat_class) { 1886 // Load fields. 1887 ClassDataItemIterator it(dex_file, class_data); 1888 Thread* self = Thread::Current(); 1889 if (it.NumStaticFields() != 0) { 1890 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1891 if (UNLIKELY(statics == NULL)) { 1892 CHECK(self->IsExceptionPending()); // OOME. 1893 return; 1894 } 1895 klass->SetSFields(statics); 1896 } 1897 if (it.NumInstanceFields() != 0) { 1898 mirror::ObjectArray<mirror::ArtField>* fields = 1899 AllocArtFieldArray(self, it.NumInstanceFields()); 1900 if (UNLIKELY(fields == NULL)) { 1901 CHECK(self->IsExceptionPending()); // OOME. 1902 return; 1903 } 1904 klass->SetIFields(fields); 1905 } 1906 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1907 SirtRef<mirror::ArtField> sfield(self, AllocArtField(self)); 1908 if (UNLIKELY(sfield.get() == NULL)) { 1909 CHECK(self->IsExceptionPending()); // OOME. 1910 return; 1911 } 1912 klass->SetStaticField(i, sfield.get()); 1913 LoadField(dex_file, it, klass, sfield); 1914 } 1915 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1916 SirtRef<mirror::ArtField> ifield(self, AllocArtField(self)); 1917 if (UNLIKELY(ifield.get() == NULL)) { 1918 CHECK(self->IsExceptionPending()); // OOME. 1919 return; 1920 } 1921 klass->SetInstanceField(i, ifield.get()); 1922 LoadField(dex_file, it, klass, ifield); 1923 } 1924 1925 // Load methods. 1926 if (it.NumDirectMethods() != 0) { 1927 // TODO: append direct methods to class object 1928 mirror::ObjectArray<mirror::ArtMethod>* directs = 1929 AllocArtMethodArray(self, it.NumDirectMethods()); 1930 if (UNLIKELY(directs == NULL)) { 1931 CHECK(self->IsExceptionPending()); // OOME. 1932 return; 1933 } 1934 klass->SetDirectMethods(directs); 1935 } 1936 if (it.NumVirtualMethods() != 0) { 1937 // TODO: append direct methods to class object 1938 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1939 AllocArtMethodArray(self, it.NumVirtualMethods()); 1940 if (UNLIKELY(virtuals == NULL)) { 1941 CHECK(self->IsExceptionPending()); // OOME. 1942 return; 1943 } 1944 klass->SetVirtualMethods(virtuals); 1945 } 1946 size_t class_def_method_index = 0; 1947 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1948 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1949 if (UNLIKELY(method.get() == NULL)) { 1950 CHECK(self->IsExceptionPending()); // OOME. 1951 return; 1952 } 1953 klass->SetDirectMethod(i, method.get()); 1954 if (oat_class != nullptr) { 1955 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 1956 } 1957 method->SetMethodIndex(class_def_method_index); 1958 class_def_method_index++; 1959 } 1960 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1961 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1962 if (UNLIKELY(method.get() == NULL)) { 1963 CHECK(self->IsExceptionPending()); // OOME. 1964 return; 1965 } 1966 klass->SetVirtualMethod(i, method.get()); 1967 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1968 if (oat_class != nullptr) { 1969 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 1970 } 1971 class_def_method_index++; 1972 } 1973 DCHECK(!it.HasNext()); 1974} 1975 1976void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1977 const SirtRef<mirror::Class>& klass, 1978 const SirtRef<mirror::ArtField>& dst) { 1979 uint32_t field_idx = it.GetMemberIndex(); 1980 dst->SetDexFieldIndex(field_idx); 1981 dst->SetDeclaringClass(klass.get()); 1982 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1983} 1984 1985mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1986 const ClassDataItemIterator& it, 1987 const SirtRef<mirror::Class>& klass) { 1988 uint32_t dex_method_idx = it.GetMemberIndex(); 1989 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1990 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 1991 1992 mirror::ArtMethod* dst = AllocArtMethod(self); 1993 if (UNLIKELY(dst == NULL)) { 1994 CHECK(self->IsExceptionPending()); // OOME. 1995 return NULL; 1996 } 1997 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 1998 1999 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2000 dst->SetDexMethodIndex(dex_method_idx); 2001 dst->SetDeclaringClass(klass.get()); 2002 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2003 2004 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2005 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2006 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2007 2008 uint32_t access_flags = it.GetMemberAccessFlags(); 2009 2010 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2011 // Set finalizable flag on declaring class. 2012 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2013 // Void return type. 2014 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 2015 klass->SetFinalizable(); 2016 } else { 2017 ClassHelper kh(klass.get()); 2018 const char* klass_descriptor = kh.GetDescriptor(); 2019 // The Enum class declares a "final" finalize() method to prevent subclasses from 2020 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2021 // subclasses, so we exclude it here. 2022 // We also want to avoid setting the flag on Object, where we know that finalize() is 2023 // empty. 2024 if ((strcmp("Ljava/lang/Object;", klass_descriptor) != 0) && 2025 (strcmp("Ljava/lang/Enum;", klass_descriptor) != 0)) { 2026 klass->SetFinalizable(); 2027 } 2028 } 2029 } 2030 } else if (method_name[0] == '<') { 2031 // Fix broken access flags for initializers. Bug 11157540. 2032 bool is_init = (strcmp("<init>", method_name) == 0); 2033 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2034 if (UNLIKELY(!is_init && !is_clinit)) { 2035 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2036 } else { 2037 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2038 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2039 << PrettyDescriptor(klass.get()) << " in dex file " << dex_file.GetLocation(); 2040 access_flags |= kAccConstructor; 2041 } 2042 } 2043 } 2044 dst->SetAccessFlags(access_flags); 2045 2046 self->EndAssertNoThreadSuspension(old_cause); 2047 return dst; 2048} 2049 2050void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2051 Thread* self = Thread::Current(); 2052 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 2053 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2054 AppendToBootClassPath(dex_file, dex_cache); 2055} 2056 2057void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2058 const SirtRef<mirror::DexCache>& dex_cache) { 2059 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 2060 boot_class_path_.push_back(&dex_file); 2061 RegisterDexFile(dex_file, dex_cache); 2062} 2063 2064bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 2065 dex_lock_.AssertSharedHeld(Thread::Current()); 2066 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2067 if (dex_caches_[i]->GetDexFile() == &dex_file) { 2068 return true; 2069 } 2070 } 2071 return false; 2072} 2073 2074bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 2075 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2076 return IsDexFileRegisteredLocked(dex_file); 2077} 2078 2079void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2080 const SirtRef<mirror::DexCache>& dex_cache) { 2081 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2082 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 2083 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2084 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2085 dex_caches_.push_back(dex_cache.get()); 2086 dex_cache->SetDexFile(&dex_file); 2087 if (log_new_dex_caches_roots_) { 2088 // TODO: This is not safe if we can remove dex caches. 2089 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2090 } 2091} 2092 2093void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2094 Thread* self = Thread::Current(); 2095 { 2096 ReaderMutexLock mu(self, dex_lock_); 2097 if (IsDexFileRegisteredLocked(dex_file)) { 2098 return; 2099 } 2100 } 2101 // Don't alloc while holding the lock, since allocation may need to 2102 // suspend all threads and another thread may need the dex_lock_ to 2103 // get to a suspend point. 2104 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 2105 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2106 { 2107 WriterMutexLock mu(self, dex_lock_); 2108 if (IsDexFileRegisteredLocked(dex_file)) { 2109 return; 2110 } 2111 RegisterDexFileLocked(dex_file, dex_cache); 2112 } 2113} 2114 2115void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2116 const SirtRef<mirror::DexCache>& dex_cache) { 2117 WriterMutexLock mu(Thread::Current(), dex_lock_); 2118 RegisterDexFileLocked(dex_file, dex_cache); 2119} 2120 2121mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 2122 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2123 // Search assuming unique-ness of dex file. 2124 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2125 mirror::DexCache* dex_cache = dex_caches_[i]; 2126 if (dex_cache->GetDexFile() == &dex_file) { 2127 return dex_cache; 2128 } 2129 } 2130 // Search matching by location name. 2131 std::string location(dex_file.GetLocation()); 2132 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2133 mirror::DexCache* dex_cache = dex_caches_[i]; 2134 if (dex_cache->GetDexFile()->GetLocation() == location) { 2135 return dex_cache; 2136 } 2137 } 2138 // Failure, dump diagnostic and abort. 2139 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2140 mirror::DexCache* dex_cache = dex_caches_[i]; 2141 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2142 } 2143 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2144 return NULL; 2145} 2146 2147void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 2148 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2149 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2150 dex_caches_[i]->Fixup(resolution_method); 2151 } 2152} 2153 2154mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2155 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2156 if (UNLIKELY(klass == NULL)) { 2157 return NULL; 2158 } 2159 return InitializePrimitiveClass(klass, type); 2160} 2161 2162mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2163 Primitive::Type type) { 2164 CHECK(primitive_class != NULL); 2165 // Must hold lock on object when initializing. 2166 Thread* self = Thread::Current(); 2167 SirtRef<mirror::Class> sirt_class(self, primitive_class); 2168 ObjectLock<mirror::Class> lock(self, &sirt_class); 2169 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2170 primitive_class->SetPrimitiveType(type); 2171 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2172 const char* descriptor = Primitive::Descriptor(type); 2173 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2174 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2175 return primitive_class; 2176} 2177 2178// Create an array class (i.e. the class object for the array, not the 2179// array itself). "descriptor" looks like "[C" or "[[[[B" or 2180// "[Ljava/lang/String;". 2181// 2182// If "descriptor" refers to an array of primitives, look up the 2183// primitive type's internally-generated class object. 2184// 2185// "class_loader" is the class loader of the class that's referring to 2186// us. It's used to ensure that we're looking for the element type in 2187// the right context. It does NOT become the class loader for the 2188// array class; that always comes from the base element class. 2189// 2190// Returns NULL with an exception raised on failure. 2191mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2192 const SirtRef<mirror::ClassLoader>& class_loader) { 2193 // Identify the underlying component type 2194 CHECK_EQ('[', descriptor[0]); 2195 SirtRef<mirror::Class> component_type(self, FindClass(self, descriptor + 1, class_loader)); 2196 if (component_type.get() == nullptr) { 2197 DCHECK(self->IsExceptionPending()); 2198 return nullptr; 2199 } 2200 2201 // See if the component type is already loaded. Array classes are 2202 // always associated with the class loader of their underlying 2203 // element type -- an array of Strings goes with the loader for 2204 // java/lang/String -- so we need to look for it there. (The 2205 // caller should have checked for the existence of the class 2206 // before calling here, but they did so with *their* class loader, 2207 // not the component type's loader.) 2208 // 2209 // If we find it, the caller adds "loader" to the class' initiating 2210 // loader list, which should prevent us from going through this again. 2211 // 2212 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2213 // are the same, because our caller (FindClass) just did the 2214 // lookup. (Even if we get this wrong we still have correct behavior, 2215 // because we effectively do this lookup again when we add the new 2216 // class to the hash table --- necessary because of possible races with 2217 // other threads.) 2218 if (class_loader.get() != component_type->GetClassLoader()) { 2219 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2220 if (new_class != NULL) { 2221 return new_class; 2222 } 2223 } 2224 2225 // Fill out the fields in the Class. 2226 // 2227 // It is possible to execute some methods against arrays, because 2228 // all arrays are subclasses of java_lang_Object_, so we need to set 2229 // up a vtable. We can just point at the one in java_lang_Object_. 2230 // 2231 // Array classes are simple enough that we don't need to do a full 2232 // link step. 2233 SirtRef<mirror::Class> new_class(self, NULL); 2234 if (UNLIKELY(!init_done_)) { 2235 // Classes that were hand created, ie not by FindSystemClass 2236 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2237 new_class.reset(GetClassRoot(kClassArrayClass)); 2238 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2239 new_class.reset(GetClassRoot(kObjectArrayClass)); 2240 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2241 new_class.reset(GetClassRoot(kJavaLangStringArrayClass)); 2242 } else if (strcmp(descriptor, 2243 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2244 new_class.reset(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2245 } else if (strcmp(descriptor, 2246 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2247 new_class.reset(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2248 } else if (strcmp(descriptor, "[C") == 0) { 2249 new_class.reset(GetClassRoot(kCharArrayClass)); 2250 } else if (strcmp(descriptor, "[I") == 0) { 2251 new_class.reset(GetClassRoot(kIntArrayClass)); 2252 } 2253 } 2254 if (new_class.get() == nullptr) { 2255 new_class.reset(AllocClass(self, sizeof(mirror::Class))); 2256 if (new_class.get() == nullptr) { 2257 return nullptr; 2258 } 2259 new_class->SetComponentType(component_type.get()); 2260 } 2261 ObjectLock<mirror::Class> lock(self, &new_class); // Must hold lock on object when initializing. 2262 DCHECK(new_class->GetComponentType() != NULL); 2263 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2264 new_class->SetSuperClass(java_lang_Object); 2265 new_class->SetVTable(java_lang_Object->GetVTable()); 2266 new_class->SetPrimitiveType(Primitive::kPrimNot); 2267 new_class->SetClassLoader(component_type->GetClassLoader()); 2268 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2269 // don't need to set new_class->SetObjectSize(..) 2270 // because Object::SizeOf delegates to Array::SizeOf 2271 2272 2273 // All arrays have java/lang/Cloneable and java/io/Serializable as 2274 // interfaces. We need to set that up here, so that stuff like 2275 // "instanceof" works right. 2276 // 2277 // Note: The GC could run during the call to FindSystemClass, 2278 // so we need to make sure the class object is GC-valid while we're in 2279 // there. Do this by clearing the interface list so the GC will just 2280 // think that the entries are null. 2281 2282 2283 // Use the single, global copies of "interfaces" and "iftable" 2284 // (remember not to free them for arrays). 2285 CHECK(array_iftable_ != nullptr); 2286 new_class->SetIfTable(array_iftable_); 2287 2288 // Inherit access flags from the component type. 2289 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2290 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2291 access_flags &= kAccJavaFlagsMask; 2292 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2293 // and remove "interface". 2294 access_flags |= kAccAbstract | kAccFinal; 2295 access_flags &= ~kAccInterface; 2296 2297 new_class->SetAccessFlags(access_flags); 2298 2299 mirror::Class* existing = InsertClass(descriptor, new_class.get(), Hash(descriptor)); 2300 if (existing == nullptr) { 2301 return new_class.get(); 2302 } 2303 // Another thread must have loaded the class after we 2304 // started but before we finished. Abandon what we've 2305 // done. 2306 // 2307 // (Yes, this happens.) 2308 2309 return existing; 2310} 2311 2312mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2313 switch (type) { 2314 case 'B': 2315 return GetClassRoot(kPrimitiveByte); 2316 case 'C': 2317 return GetClassRoot(kPrimitiveChar); 2318 case 'D': 2319 return GetClassRoot(kPrimitiveDouble); 2320 case 'F': 2321 return GetClassRoot(kPrimitiveFloat); 2322 case 'I': 2323 return GetClassRoot(kPrimitiveInt); 2324 case 'J': 2325 return GetClassRoot(kPrimitiveLong); 2326 case 'S': 2327 return GetClassRoot(kPrimitiveShort); 2328 case 'Z': 2329 return GetClassRoot(kPrimitiveBoolean); 2330 case 'V': 2331 return GetClassRoot(kPrimitiveVoid); 2332 default: 2333 break; 2334 } 2335 std::string printable_type(PrintableChar(type)); 2336 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2337 return NULL; 2338} 2339 2340mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2341 size_t hash) { 2342 if (VLOG_IS_ON(class_linker)) { 2343 mirror::DexCache* dex_cache = klass->GetDexCache(); 2344 std::string source; 2345 if (dex_cache != NULL) { 2346 source += " from "; 2347 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2348 } 2349 LOG(INFO) << "Loaded class " << descriptor << source; 2350 } 2351 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2352 mirror::Class* existing = 2353 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2354 if (existing != NULL) { 2355 return existing; 2356 } 2357 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2358 // Check a class loaded with the system class loader matches one in the image if the class 2359 // is in the image. 2360 existing = LookupClassFromImage(descriptor); 2361 if (existing != NULL) { 2362 CHECK(klass == existing); 2363 } 2364 } 2365 VerifyObject(klass); 2366 class_table_.insert(std::make_pair(hash, klass)); 2367 if (log_new_class_table_roots_) { 2368 new_class_roots_.push_back(std::make_pair(hash, klass)); 2369 } 2370 return NULL; 2371} 2372 2373bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2374 size_t hash = Hash(descriptor); 2375 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2376 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2377 ++it) { 2378 mirror::Class* klass = it->second; 2379 ClassHelper kh(klass); 2380 if ((klass->GetClassLoader() == class_loader) && 2381 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2382 class_table_.erase(it); 2383 return true; 2384 } 2385 } 2386 return false; 2387} 2388 2389mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2390 const mirror::ClassLoader* class_loader) { 2391 size_t hash = Hash(descriptor); 2392 { 2393 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2394 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2395 if (result != NULL) { 2396 return result; 2397 } 2398 } 2399 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2400 return NULL; 2401 } else { 2402 // Lookup failed but need to search dex_caches_. 2403 mirror::Class* result = LookupClassFromImage(descriptor); 2404 if (result != NULL) { 2405 InsertClass(descriptor, result, hash); 2406 } else { 2407 // Searching the image dex files/caches failed, we don't want to get into this situation 2408 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2409 // classes into the class table. 2410 const int32_t kMaxFailedDexCacheLookups = 1000; 2411 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2412 MoveImageClassesToClassTable(); 2413 } 2414 } 2415 return result; 2416 } 2417} 2418 2419mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2420 const mirror::ClassLoader* class_loader, 2421 size_t hash) { 2422 auto end = class_table_.end(); 2423 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2424 mirror::Class* klass = it->second; 2425 ClassHelper kh(klass); 2426 if ((klass->GetClassLoader() == class_loader) && 2427 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2428 if (kIsDebugBuild) { 2429 // Check for duplicates in the table. 2430 for (++it; it != end && it->first == hash; ++it) { 2431 mirror::Class* klass2 = it->second; 2432 ClassHelper kh(klass2); 2433 CHECK(!((klass2->GetClassLoader() == class_loader) && 2434 (strcmp(descriptor, kh.GetDescriptor()) == 0))) 2435 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2436 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2437 } 2438 } 2439 return klass; 2440 } 2441 } 2442 return NULL; 2443} 2444 2445static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2446 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2447 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2448 CHECK(image != NULL); 2449 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2450 return root->AsObjectArray<mirror::DexCache>(); 2451} 2452 2453void ClassLinker::MoveImageClassesToClassTable() { 2454 Thread* self = Thread::Current(); 2455 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2456 if (!dex_cache_image_class_lookup_required_) { 2457 return; // All dex cache classes are already in the class table. 2458 } 2459 const char* old_no_suspend_cause = 2460 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2461 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2462 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2463 mirror::DexCache* dex_cache = dex_caches->Get(i); 2464 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2465 for (int32_t j = 0; j < types->GetLength(); j++) { 2466 mirror::Class* klass = types->Get(j); 2467 if (klass != NULL) { 2468 ClassHelper kh(klass); 2469 DCHECK(klass->GetClassLoader() == NULL); 2470 const char* descriptor = kh.GetDescriptor(); 2471 size_t hash = Hash(descriptor); 2472 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 2473 if (existing != NULL) { 2474 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2475 << PrettyClassAndClassLoader(klass); 2476 } else { 2477 class_table_.insert(std::make_pair(hash, klass)); 2478 if (log_new_class_table_roots_) { 2479 new_class_roots_.push_back(std::make_pair(hash, klass)); 2480 } 2481 } 2482 } 2483 } 2484 } 2485 dex_cache_image_class_lookup_required_ = false; 2486 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2487} 2488 2489mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2490 Thread* self = Thread::Current(); 2491 const char* old_no_suspend_cause = 2492 self->StartAssertNoThreadSuspension("Image class lookup"); 2493 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2494 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2495 mirror::DexCache* dex_cache = dex_caches->Get(i); 2496 const DexFile* dex_file = dex_cache->GetDexFile(); 2497 // Try binary searching the string/type index. 2498 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2499 if (string_id != NULL) { 2500 const DexFile::TypeId* type_id = 2501 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2502 if (type_id != NULL) { 2503 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2504 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2505 if (klass != NULL) { 2506 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2507 return klass; 2508 } 2509 } 2510 } 2511 } 2512 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2513 return NULL; 2514} 2515 2516void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2517 result.clear(); 2518 if (dex_cache_image_class_lookup_required_) { 2519 MoveImageClassesToClassTable(); 2520 } 2521 size_t hash = Hash(descriptor); 2522 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2523 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2524 it != end && it->first == hash; ++it) { 2525 mirror::Class* klass = it->second; 2526 ClassHelper kh(klass); 2527 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2528 result.push_back(klass); 2529 } 2530 } 2531} 2532 2533void ClassLinker::VerifyClass(const SirtRef<mirror::Class>& klass) { 2534 // TODO: assert that the monitor on the Class is held 2535 Thread* self = Thread::Current(); 2536 ObjectLock<mirror::Class> lock(self, &klass); 2537 2538 // Don't attempt to re-verify if already sufficiently verified. 2539 if (klass->IsVerified() || 2540 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2541 return; 2542 } 2543 2544 // The class might already be erroneous, for example at compile time if we attempted to verify 2545 // this class as a parent to another. 2546 if (klass->IsErroneous()) { 2547 ThrowEarlierClassFailure(klass.get()); 2548 return; 2549 } 2550 2551 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2552 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2553 } else { 2554 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2555 << PrettyClass(klass.get()); 2556 CHECK(!Runtime::Current()->IsCompiler()); 2557 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2558 } 2559 2560 // Skip verification if disabled. 2561 if (!Runtime::Current()->IsVerificationEnabled()) { 2562 klass->SetStatus(mirror::Class::kStatusVerified, self); 2563 return; 2564 } 2565 2566 // Verify super class. 2567 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 2568 if (super.get() != NULL) { 2569 // Acquire lock to prevent races on verifying the super class. 2570 ObjectLock<mirror::Class> lock(self, &super); 2571 2572 if (!super->IsVerified() && !super->IsErroneous()) { 2573 VerifyClass(super); 2574 } 2575 if (!super->IsCompileTimeVerified()) { 2576 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2577 PrettyDescriptor(klass.get()).c_str(), 2578 PrettyDescriptor(super.get()).c_str())); 2579 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2580 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 2581 if (cause.get() != nullptr) { 2582 self->ClearException(); 2583 } 2584 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2585 if (cause.get() != nullptr) { 2586 self->GetException(nullptr)->SetCause(cause.get()); 2587 } 2588 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2589 if (Runtime::Current()->IsCompiler()) { 2590 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2591 } 2592 klass->SetStatus(mirror::Class::kStatusError, self); 2593 return; 2594 } 2595 } 2596 2597 // Try to use verification information from the oat file, otherwise do runtime verification. 2598 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2599 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2600 bool preverified = VerifyClassUsingOatFile(dex_file, klass.get(), oat_file_class_status); 2601 if (oat_file_class_status == mirror::Class::kStatusError) { 2602 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2603 << PrettyDescriptor(klass.get()) << " in " 2604 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2605 ThrowVerifyError(klass.get(), "Rejecting class %s because it failed compile-time verification", 2606 PrettyDescriptor(klass.get()).c_str()); 2607 klass->SetStatus(mirror::Class::kStatusError, self); 2608 return; 2609 } 2610 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2611 std::string error_msg; 2612 if (!preverified) { 2613 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.get(), 2614 Runtime::Current()->IsCompiler(), 2615 &error_msg); 2616 } 2617 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2618 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2619 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.get()) 2620 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2621 << " because: " << error_msg; 2622 } 2623 self->AssertNoPendingException(); 2624 // Make sure all classes referenced by catch blocks are resolved. 2625 ResolveClassExceptionHandlerTypes(dex_file, klass); 2626 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2627 // Even though there were no verifier failures we need to respect whether the super-class 2628 // was verified or requiring runtime reverification. 2629 if (super.get() == NULL || super->IsVerified()) { 2630 klass->SetStatus(mirror::Class::kStatusVerified, self); 2631 } else { 2632 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2633 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2634 // Pretend a soft failure occured so that we don't consider the class verified below. 2635 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2636 } 2637 } else { 2638 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2639 // Soft failures at compile time should be retried at runtime. Soft 2640 // failures at runtime will be handled by slow paths in the generated 2641 // code. Set status accordingly. 2642 if (Runtime::Current()->IsCompiler()) { 2643 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2644 } else { 2645 klass->SetStatus(mirror::Class::kStatusVerified, self); 2646 } 2647 } 2648 } else { 2649 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.get()) 2650 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2651 << " because: " << error_msg; 2652 self->AssertNoPendingException(); 2653 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2654 klass->SetStatus(mirror::Class::kStatusError, self); 2655 } 2656 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2657 // Class is verified so we don't need to do any access check on its methods. 2658 // Let the interpreter know it by setting the kAccPreverified flag onto each 2659 // method. 2660 // Note: we're going here during compilation and at runtime. When we set the 2661 // kAccPreverified flag when compiling image classes, the flag is recorded 2662 // in the image and is set when loading the image. 2663 klass->SetPreverifiedFlagOnAllMethods(); 2664 } 2665} 2666 2667bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2668 mirror::Class::Status& oat_file_class_status) { 2669 // If we're compiling, we can only verify the class using the oat file if 2670 // we are not compiling the image or if the class we're verifying is not part of 2671 // the app. In other words, we will only check for preverification of bootclasspath 2672 // classes. 2673 if (Runtime::Current()->IsCompiler()) { 2674 // Are we compiling the bootclasspath? 2675 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2676 return false; 2677 } 2678 // We are compiling an app (not the image). 2679 2680 // Is this an app class? (I.e. not a bootclasspath class) 2681 if (klass->GetClassLoader() != NULL) { 2682 return false; 2683 } 2684 } 2685 2686 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2687 // Make this work with gtests, which do not set up the image properly. 2688 // TODO: we should clean up gtests to set up the image path properly. 2689 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2690 return false; 2691 } 2692 2693 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2694 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2695 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2696 &dex_location_checksum); 2697 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2698 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2699 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 2700 if (oat_file_class_status == mirror::Class::kStatusVerified || 2701 oat_file_class_status == mirror::Class::kStatusInitialized) { 2702 return true; 2703 } 2704 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2705 // Compile time verification failed with a soft error. Compile time verification can fail 2706 // because we have incomplete type information. Consider the following: 2707 // class ... { 2708 // Foo x; 2709 // .... () { 2710 // if (...) { 2711 // v1 gets assigned a type of resolved class Foo 2712 // } else { 2713 // v1 gets assigned a type of unresolved class Bar 2714 // } 2715 // iput x = v1 2716 // } } 2717 // when we merge v1 following the if-the-else it results in Conflict 2718 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2719 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2720 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2721 // at compile time). 2722 return false; 2723 } 2724 if (oat_file_class_status == mirror::Class::kStatusError) { 2725 // Compile time verification failed with a hard error. This is caused by invalid instructions 2726 // in the class. These errors are unrecoverable. 2727 return false; 2728 } 2729 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2730 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2731 // not loading the class. 2732 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2733 // isn't a problem and this case shouldn't occur 2734 return false; 2735 } 2736 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2737 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2738 << ClassHelper(klass).GetDescriptor(); 2739 2740 return false; 2741} 2742 2743void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2744 const SirtRef<mirror::Class>& klass) { 2745 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2746 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2747 } 2748 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2749 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2750 } 2751} 2752 2753void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2754 mirror::ArtMethod* method) { 2755 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2756 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2757 if (code_item == NULL) { 2758 return; // native or abstract method 2759 } 2760 if (code_item->tries_size_ == 0) { 2761 return; // nothing to process 2762 } 2763 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2764 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2765 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2766 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2767 CatchHandlerIterator iterator(handlers_ptr); 2768 for (; iterator.HasNext(); iterator.Next()) { 2769 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2770 // unresolved exception types will be ignored by exception delivery 2771 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2772 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2773 if (exception_type == NULL) { 2774 DCHECK(Thread::Current()->IsExceptionPending()); 2775 Thread::Current()->ClearException(); 2776 } 2777 } 2778 } 2779 handlers_ptr = iterator.EndDataPointer(); 2780 } 2781} 2782 2783static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2784static void CheckProxyMethod(mirror::ArtMethod* method, 2785 SirtRef<mirror::ArtMethod>& prototype); 2786 2787mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccess& soa, jstring name, 2788 jobjectArray interfaces, jobject loader, 2789 jobjectArray methods, jobjectArray throws) { 2790 Thread* self = soa.Self(); 2791 SirtRef<mirror::Class> klass(self, AllocClass(self, GetClassRoot(kJavaLangClass), 2792 sizeof(mirror::SynthesizedProxyClass))); 2793 if (klass.get() == NULL) { 2794 CHECK(self->IsExceptionPending()); // OOME. 2795 return NULL; 2796 } 2797 DCHECK(klass->GetClass() != NULL); 2798 klass->SetObjectSize(sizeof(mirror::Proxy)); 2799 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2800 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2801 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2802 klass->SetName(soa.Decode<mirror::String*>(name)); 2803 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2804 klass->SetDexCache(proxy_class->GetDexCache()); 2805 klass->SetStatus(mirror::Class::kStatusIdx, self); 2806 2807 // Instance fields are inherited, but we add a couple of static fields... 2808 { 2809 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2810 if (UNLIKELY(sfields == NULL)) { 2811 CHECK(self->IsExceptionPending()); // OOME. 2812 return NULL; 2813 } 2814 klass->SetSFields(sfields); 2815 } 2816 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2817 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2818 SirtRef<mirror::ArtField> interfaces_sfield(self, AllocArtField(self)); 2819 if (UNLIKELY(interfaces_sfield.get() == NULL)) { 2820 CHECK(self->IsExceptionPending()); // OOME. 2821 return NULL; 2822 } 2823 klass->SetStaticField(0, interfaces_sfield.get()); 2824 interfaces_sfield->SetDexFieldIndex(0); 2825 interfaces_sfield->SetDeclaringClass(klass.get()); 2826 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2827 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2828 SirtRef<mirror::ArtField> throws_sfield(self, AllocArtField(self)); 2829 if (UNLIKELY(throws_sfield.get() == NULL)) { 2830 CHECK(self->IsExceptionPending()); // OOME. 2831 return NULL; 2832 } 2833 klass->SetStaticField(1, throws_sfield.get()); 2834 throws_sfield->SetDexFieldIndex(1); 2835 throws_sfield->SetDeclaringClass(klass.get()); 2836 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2837 2838 // Proxies have 1 direct method, the constructor 2839 { 2840 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 2841 if (UNLIKELY(directs == NULL)) { 2842 CHECK(self->IsExceptionPending()); // OOME. 2843 return NULL; 2844 } 2845 klass->SetDirectMethods(directs); 2846 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2847 if (UNLIKELY(constructor == NULL)) { 2848 CHECK(self->IsExceptionPending()); // OOME. 2849 return NULL; 2850 } 2851 klass->SetDirectMethod(0, constructor); 2852 } 2853 2854 // Create virtual method using specified prototypes. 2855 size_t num_virtual_methods = 2856 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 2857 { 2858 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, num_virtual_methods); 2859 if (UNLIKELY(virtuals == NULL)) { 2860 CHECK(self->IsExceptionPending()); // OOME. 2861 return NULL; 2862 } 2863 klass->SetVirtualMethods(virtuals); 2864 } 2865 for (size_t i = 0; i < num_virtual_methods; ++i) { 2866 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2867 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2868 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2869 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2870 if (UNLIKELY(clone == NULL)) { 2871 CHECK(self->IsExceptionPending()); // OOME. 2872 return NULL; 2873 } 2874 klass->SetVirtualMethod(i, clone); 2875 } 2876 2877 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2878 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Class is now effectively in the loaded state 2879 self->AssertNoPendingException(); 2880 2881 { 2882 ObjectLock<mirror::Class> lock(self, &klass); // Must hold lock on object when resolved. 2883 // Link the fields and virtual methods, creating vtable and iftables 2884 SirtRef<mirror::ObjectArray<mirror::Class> > sirt_interfaces( 2885 self, soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2886 if (!LinkClass(self, klass, sirt_interfaces)) { 2887 klass->SetStatus(mirror::Class::kStatusError, self); 2888 return nullptr; 2889 } 2890 2891 interfaces_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2892 throws_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2893 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2894 } 2895 2896 // sanity checks 2897 if (kIsDebugBuild) { 2898 CHECK(klass->GetIFields() == NULL); 2899 CheckProxyConstructor(klass->GetDirectMethod(0)); 2900 for (size_t i = 0; i < num_virtual_methods; ++i) { 2901 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2902 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2903 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2904 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2905 } 2906 2907 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 2908 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2909 decoded_name->ToModifiedUtf8().c_str())); 2910 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2911 2912 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2913 decoded_name->ToModifiedUtf8().c_str())); 2914 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2915 2916 mirror::SynthesizedProxyClass* synth_proxy_class = 2917 down_cast<mirror::SynthesizedProxyClass*>(klass.get()); 2918 CHECK_EQ(synth_proxy_class->GetInterfaces(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2919 CHECK_EQ(synth_proxy_class->GetThrows(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2920 } 2921 std::string descriptor(GetDescriptorForProxy(klass.get())); 2922 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.get(), Hash(descriptor.c_str())); 2923 CHECK(existing == nullptr); 2924 return klass.get(); 2925} 2926 2927std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 2928 DCHECK(proxy_class->IsProxyClass()); 2929 mirror::String* name = proxy_class->GetName(); 2930 DCHECK(name != NULL); 2931 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2932} 2933 2934mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 2935 mirror::ArtMethod* proxy_method) { 2936 DCHECK(proxy_class->IsProxyClass()); 2937 DCHECK(proxy_method->IsProxyMethod()); 2938 // Locate the dex cache of the original interface/Object 2939 mirror::DexCache* dex_cache = NULL; 2940 { 2941 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2942 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2943 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2944 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2945 dex_cache = dex_caches_[i]; 2946 break; 2947 } 2948 } 2949 } 2950 CHECK(dex_cache != NULL); 2951 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2952 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2953 CHECK(resolved_method != NULL); 2954 return resolved_method; 2955} 2956 2957 2958mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2959 const SirtRef<mirror::Class>& klass, 2960 mirror::Class* proxy_class) { 2961 // Create constructor for Proxy that must initialize h 2962 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2963 proxy_class->GetDirectMethods(); 2964 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2965 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2966 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2967 // code_ too) 2968 mirror::ArtMethod* constructor = 2969 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2970 if (constructor == NULL) { 2971 CHECK(self->IsExceptionPending()); // OOME. 2972 return NULL; 2973 } 2974 // Make this constructor public and fix the class to be our Proxy version 2975 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2976 constructor->SetDeclaringClass(klass.get()); 2977 return constructor; 2978} 2979 2980static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2981 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2982 CHECK(constructor->IsConstructor()); 2983 MethodHelper mh(constructor); 2984 CHECK_STREQ(mh.GetName(), "<init>"); 2985 CHECK_STREQ(mh.GetSignature().ToString().c_str(), "(Ljava/lang/reflect/InvocationHandler;)V"); 2986 DCHECK(constructor->IsPublic()); 2987} 2988 2989mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 2990 const SirtRef<mirror::Class>& klass, 2991 const SirtRef<mirror::ArtMethod>& prototype) { 2992 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2993 // prototype method 2994 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2995 prototype.get()); 2996 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2997 // as necessary 2998 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 2999 if (UNLIKELY(method == NULL)) { 3000 CHECK(self->IsExceptionPending()); // OOME. 3001 return NULL; 3002 } 3003 3004 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3005 // the intersection of throw exceptions as defined in Proxy 3006 method->SetDeclaringClass(klass.get()); 3007 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3008 3009 // At runtime the method looks like a reference and argument saving method, clone the code 3010 // related parameters from this method. 3011 mirror::ArtMethod* refs_and_args = 3012 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 3013 method->SetCoreSpillMask(refs_and_args->GetCoreSpillMask()); 3014 method->SetFpSpillMask(refs_and_args->GetFpSpillMask()); 3015 method->SetFrameSizeInBytes(refs_and_args->GetFrameSizeInBytes()); 3016 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3017 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3018 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3019 3020 return method; 3021} 3022 3023static void CheckProxyMethod(mirror::ArtMethod* method, 3024 SirtRef<mirror::ArtMethod>& prototype) 3025 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3026 // Basic sanity 3027 CHECK(!prototype->IsFinal()); 3028 CHECK(method->IsFinal()); 3029 CHECK(!method->IsAbstract()); 3030 3031 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3032 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3033 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3034 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 3035 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 3036 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3037 3038 MethodHelper mh(method); 3039 MethodHelper mh2(prototype.get()); 3040 CHECK_STREQ(mh.GetName(), mh2.GetName()); 3041 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 3042 // More complex sanity - via dex cache 3043 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3044} 3045 3046static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3047 bool can_init_parents) 3048 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3049 if (can_init_statics && can_init_parents) { 3050 return true; 3051 } 3052 if (!can_init_statics) { 3053 // Check if there's a class initializer. 3054 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3055 if (clinit != NULL) { 3056 return false; 3057 } 3058 // Check if there are encoded static values needing initialization. 3059 if (klass->NumStaticFields() != 0) { 3060 ClassHelper kh(klass); 3061 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3062 DCHECK(dex_class_def != NULL); 3063 if (dex_class_def->static_values_off_ != 0) { 3064 return false; 3065 } 3066 } 3067 } 3068 if (!klass->IsInterface() && klass->HasSuperClass()) { 3069 mirror::Class* super_class = klass->GetSuperClass(); 3070 if (!can_init_parents && !super_class->IsInitialized()) { 3071 return false; 3072 } else { 3073 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3074 return false; 3075 } 3076 } 3077 } 3078 return true; 3079} 3080 3081bool ClassLinker::IsInitialized() const { 3082 return init_done_; 3083} 3084 3085bool ClassLinker::InitializeClass(const SirtRef<mirror::Class>& klass, bool can_init_statics, 3086 bool can_init_parents) { 3087 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3088 3089 // Are we already initialized and therefore done? 3090 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3091 // an initialized class will never change its state. 3092 if (klass->IsInitialized()) { 3093 return true; 3094 } 3095 3096 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3097 if (!CanWeInitializeClass(klass.get(), can_init_statics, can_init_parents)) { 3098 return false; 3099 } 3100 3101 Thread* self = Thread::Current(); 3102 uint64_t t0; 3103 { 3104 ObjectLock<mirror::Class> lock(self, &klass); 3105 3106 // Re-check under the lock in case another thread initialized ahead of us. 3107 if (klass->IsInitialized()) { 3108 return true; 3109 } 3110 3111 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3112 if (klass->IsErroneous()) { 3113 ThrowEarlierClassFailure(klass.get()); 3114 return false; 3115 } 3116 3117 CHECK(klass->IsResolved()) << PrettyClass(klass.get()) << ": state=" << klass->GetStatus(); 3118 3119 if (!klass->IsVerified()) { 3120 VerifyClass(klass); 3121 if (!klass->IsVerified()) { 3122 // We failed to verify, expect either the klass to be erroneous or verification failed at 3123 // compile time. 3124 if (klass->IsErroneous()) { 3125 CHECK(self->IsExceptionPending()); 3126 } else { 3127 CHECK(Runtime::Current()->IsCompiler()); 3128 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3129 } 3130 return false; 3131 } 3132 } 3133 3134 // If the class is kStatusInitializing, either this thread is 3135 // initializing higher up the stack or another thread has beat us 3136 // to initializing and we need to wait. Either way, this 3137 // invocation of InitializeClass will not be responsible for 3138 // running <clinit> and will return. 3139 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3140 // We caught somebody else in the act; was it us? 3141 if (klass->GetClinitThreadId() == self->GetTid()) { 3142 // Yes. That's fine. Return so we can continue initializing. 3143 return true; 3144 } 3145 // No. That's fine. Wait for another thread to finish initializing. 3146 return WaitForInitializeClass(klass, self, lock); 3147 } 3148 3149 if (!ValidateSuperClassDescriptors(klass)) { 3150 klass->SetStatus(mirror::Class::kStatusError, self); 3151 return false; 3152 } 3153 3154 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.get()); 3155 3156 // From here out other threads may observe that we're initializing and so changes of state 3157 // require the a notification. 3158 klass->SetClinitThreadId(self->GetTid()); 3159 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3160 3161 t0 = NanoTime(); 3162 } 3163 3164 // Initialize super classes, must be done while initializing for the JLS. 3165 if (!klass->IsInterface() && klass->HasSuperClass()) { 3166 mirror::Class* super_class = klass->GetSuperClass(); 3167 if (!super_class->IsInitialized()) { 3168 CHECK(!super_class->IsInterface()); 3169 CHECK(can_init_parents); 3170 SirtRef<mirror::Class> sirt_super(self, super_class); 3171 bool super_initialized = InitializeClass(sirt_super, can_init_statics, true); 3172 if (!super_initialized) { 3173 // The super class was verified ahead of entering initializing, we should only be here if 3174 // the super class became erroneous due to initialization. 3175 CHECK(sirt_super->IsErroneous() && self->IsExceptionPending()) 3176 << "Super class initialization failed for " << PrettyDescriptor(sirt_super.get()) 3177 << " that has unexpected status " << sirt_super->GetStatus() 3178 << "\nPending exception:\n" 3179 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3180 ObjectLock<mirror::Class> lock(self, &klass); 3181 // Initialization failed because the super-class is erroneous. 3182 klass->SetStatus(mirror::Class::kStatusError, self); 3183 return false; 3184 } 3185 } 3186 } 3187 3188 if (klass->NumStaticFields() > 0) { 3189 ClassHelper kh(klass.get()); 3190 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3191 CHECK(dex_class_def != NULL); 3192 const DexFile& dex_file = kh.GetDexFile(); 3193 SirtRef<mirror::ClassLoader> class_loader(self, klass->GetClassLoader()); 3194 SirtRef<mirror::DexCache> dex_cache(self, kh.GetDexCache()); 3195 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3196 this, *dex_class_def); 3197 if (it.HasNext()) { 3198 CHECK(can_init_statics); 3199 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 3200 SafeMap<uint32_t, mirror::ArtField*> field_map; 3201 ConstructFieldMap(dex_file, *dex_class_def, klass.get(), field_map); 3202 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3203 if (Runtime::Current()->IsActiveTransaction()) { 3204 it.ReadValueToField<true>(field_map.Get(i)); 3205 } else { 3206 it.ReadValueToField<false>(field_map.Get(i)); 3207 } 3208 } 3209 } 3210 } 3211 3212 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3213 if (clinit != NULL) { 3214 CHECK(can_init_statics); 3215 if (LIKELY(Runtime::Current()->IsStarted())) { 3216 JValue result; 3217 clinit->Invoke(self, NULL, 0, &result, "V"); 3218 } else { 3219 art::interpreter::EnterInterpreterFromInvoke(self, clinit, NULL, NULL, NULL); 3220 } 3221 } 3222 3223 uint64_t t1 = NanoTime(); 3224 3225 bool success = true; 3226 { 3227 ObjectLock<mirror::Class> lock(self, &klass); 3228 3229 if (self->IsExceptionPending()) { 3230 WrapExceptionInInitializer(); 3231 klass->SetStatus(mirror::Class::kStatusError, self); 3232 success = false; 3233 } else { 3234 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3235 RuntimeStats* thread_stats = self->GetStats(); 3236 ++global_stats->class_init_count; 3237 ++thread_stats->class_init_count; 3238 global_stats->class_init_time_ns += (t1 - t0); 3239 thread_stats->class_init_time_ns += (t1 - t0); 3240 // Set the class as initialized except if failed to initialize static fields. 3241 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3242 if (VLOG_IS_ON(class_linker)) { 3243 ClassHelper kh(klass.get()); 3244 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 3245 } 3246 // Opportunistically set static method trampolines to their destination. 3247 FixupStaticTrampolines(klass.get()); 3248 } 3249 } 3250 return success; 3251} 3252 3253bool ClassLinker::WaitForInitializeClass(const SirtRef<mirror::Class>& klass, Thread* self, 3254 ObjectLock<mirror::Class>& lock) 3255 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3256 while (true) { 3257 self->AssertNoPendingException(); 3258 CHECK(!klass->IsInitialized()); 3259 lock.WaitIgnoringInterrupts(); 3260 3261 // When we wake up, repeat the test for init-in-progress. If 3262 // there's an exception pending (only possible if 3263 // "interruptShouldThrow" was set), bail out. 3264 if (self->IsExceptionPending()) { 3265 WrapExceptionInInitializer(); 3266 klass->SetStatus(mirror::Class::kStatusError, self); 3267 return false; 3268 } 3269 // Spurious wakeup? Go back to waiting. 3270 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3271 continue; 3272 } 3273 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3274 // Compile time initialization failed. 3275 return false; 3276 } 3277 if (klass->IsErroneous()) { 3278 // The caller wants an exception, but it was thrown in a 3279 // different thread. Synthesize one here. 3280 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3281 PrettyDescriptor(klass.get()).c_str()); 3282 return false; 3283 } 3284 if (klass->IsInitialized()) { 3285 return true; 3286 } 3287 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.get()) << " is " 3288 << klass->GetStatus(); 3289 } 3290 LOG(FATAL) << "Not Reached" << PrettyClass(klass.get()); 3291} 3292 3293bool ClassLinker::ValidateSuperClassDescriptors(const SirtRef<mirror::Class>& klass) { 3294 if (klass->IsInterface()) { 3295 return true; 3296 } 3297 Thread* self = Thread::Current(); 3298 // begin with the methods local to the superclass 3299 if (klass->HasSuperClass() && 3300 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3301 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 3302 for (int i = super->GetVTable()->GetLength() - 1; i >= 0; --i) { 3303 mirror::ArtMethod* method = klass->GetVTable()->Get(i); 3304 if (method != super->GetVTable()->Get(i) && 3305 !IsSameMethodSignatureInDifferentClassContexts(self, method, super.get(), klass.get())) { 3306 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in superclass %s", 3307 PrettyDescriptor(klass.get()).c_str(), PrettyMethod(method).c_str(), 3308 PrettyDescriptor(super.get()).c_str()); 3309 return false; 3310 } 3311 } 3312 } 3313 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3314 SirtRef<mirror::Class> interface(self, klass->GetIfTable()->GetInterface(i)); 3315 if (klass->GetClassLoader() != interface->GetClassLoader()) { 3316 for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { 3317 mirror::ArtMethod* method = klass->GetIfTable()->GetMethodArray(i)->Get(j); 3318 if (!IsSameMethodSignatureInDifferentClassContexts(self, method, interface.get(), 3319 method->GetDeclaringClass())) { 3320 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in interface %s", 3321 PrettyDescriptor(method->GetDeclaringClass()).c_str(), 3322 PrettyMethod(method).c_str(), 3323 PrettyDescriptor(interface.get()).c_str()); 3324 return false; 3325 } 3326 } 3327 } 3328 } 3329 return true; 3330} 3331 3332// Returns true if classes referenced by the signature of the method are the 3333// same classes in klass1 as they are in klass2. 3334bool ClassLinker::IsSameMethodSignatureInDifferentClassContexts(Thread* self, 3335 mirror::ArtMethod* method, 3336 mirror::Class* klass1, 3337 mirror::Class* klass2) { 3338 if (klass1 == klass2) { 3339 return true; 3340 } 3341 CHECK(klass1 != nullptr); 3342 CHECK(klass2 != nullptr); 3343 SirtRef<mirror::ClassLoader> loader1(self, klass1->GetClassLoader()); 3344 SirtRef<mirror::ClassLoader> loader2(self, klass2->GetClassLoader()); 3345 const DexFile& dex_file = *method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 3346 const DexFile::ProtoId& proto_id = 3347 dex_file.GetMethodPrototype(dex_file.GetMethodId(method->GetDexMethodIndex())); 3348 for (DexFileParameterIterator it(dex_file, proto_id); it.HasNext(); it.Next()) { 3349 const char* descriptor = it.GetDescriptor(); 3350 if (descriptor == nullptr) { 3351 break; 3352 } 3353 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3354 // Found a non-primitive type. 3355 if (!IsSameDescriptorInDifferentClassContexts(self, descriptor, loader1, loader2)) { 3356 return false; 3357 } 3358 } 3359 } 3360 // Check the return type 3361 const char* descriptor = dex_file.GetReturnTypeDescriptor(proto_id); 3362 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3363 if (!IsSameDescriptorInDifferentClassContexts(self, descriptor, loader1, loader2)) { 3364 return false; 3365 } 3366 } 3367 return true; 3368} 3369 3370// Returns true if the descriptor resolves to the same class in the context of loader1 and loader2. 3371bool ClassLinker::IsSameDescriptorInDifferentClassContexts(Thread* self, const char* descriptor, 3372 SirtRef<mirror::ClassLoader>& loader1, 3373 SirtRef<mirror::ClassLoader>& loader2) { 3374 CHECK(descriptor != nullptr); 3375 SirtRef<mirror::Class> found1(self, FindClass(self, descriptor, loader1)); 3376 if (found1.get() == nullptr) { 3377 self->ClearException(); 3378 } 3379 mirror::Class* found2 = FindClass(self, descriptor, loader2); 3380 if (found2 == nullptr) { 3381 self->ClearException(); 3382 } 3383 return found1.get() == found2; 3384} 3385 3386bool ClassLinker::EnsureInitialized(const SirtRef<mirror::Class>& c, bool can_init_fields, 3387 bool can_init_parents) { 3388 DCHECK(c.get() != NULL); 3389 if (c->IsInitialized()) { 3390 return true; 3391 } 3392 3393 bool success = InitializeClass(c, can_init_fields, can_init_parents); 3394 if (!success) { 3395 if (can_init_fields && can_init_parents) { 3396 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.get()); 3397 } 3398 } 3399 return success; 3400} 3401 3402void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3403 mirror::Class* c, 3404 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3405 const byte* class_data = dex_file.GetClassData(dex_class_def); 3406 ClassDataItemIterator it(dex_file, class_data); 3407 Thread* self = Thread::Current(); 3408 SirtRef<mirror::DexCache> dex_cache(self, c->GetDexCache()); 3409 SirtRef<mirror::ClassLoader> class_loader(self, c->GetClassLoader()); 3410 CHECK(!kMovingFields); 3411 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3412 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3413 } 3414} 3415 3416bool ClassLinker::LinkClass(Thread* self, const SirtRef<mirror::Class>& klass, 3417 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3418 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3419 if (!LinkSuperClass(klass)) { 3420 return false; 3421 } 3422 if (!LinkMethods(klass, interfaces)) { 3423 return false; 3424 } 3425 if (!LinkInstanceFields(klass)) { 3426 return false; 3427 } 3428 if (!LinkStaticFields(klass)) { 3429 return false; 3430 } 3431 CreateReferenceInstanceOffsets(klass); 3432 CreateReferenceStaticOffsets(klass); 3433 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3434 klass->SetStatus(mirror::Class::kStatusResolved, self); 3435 return true; 3436} 3437 3438bool ClassLinker::LoadSuperAndInterfaces(const SirtRef<mirror::Class>& klass, 3439 const DexFile& dex_file) { 3440 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3441 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3442 uint16_t super_class_idx = class_def.superclass_idx_; 3443 if (super_class_idx != DexFile::kDexNoIndex16) { 3444 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.get()); 3445 if (super_class == NULL) { 3446 DCHECK(Thread::Current()->IsExceptionPending()); 3447 return false; 3448 } 3449 // Verify 3450 if (!klass->CanAccess(super_class)) { 3451 ThrowIllegalAccessError(klass.get(), "Class %s extended by class %s is inaccessible", 3452 PrettyDescriptor(super_class).c_str(), 3453 PrettyDescriptor(klass.get()).c_str()); 3454 return false; 3455 } 3456 klass->SetSuperClass(super_class); 3457 } 3458 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3459 if (interfaces != NULL) { 3460 for (size_t i = 0; i < interfaces->Size(); i++) { 3461 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3462 mirror::Class* interface = ResolveType(dex_file, idx, klass.get()); 3463 if (interface == NULL) { 3464 DCHECK(Thread::Current()->IsExceptionPending()); 3465 return false; 3466 } 3467 // Verify 3468 if (!klass->CanAccess(interface)) { 3469 // TODO: the RI seemed to ignore this in my testing. 3470 ThrowIllegalAccessError(klass.get(), "Interface %s implemented by class %s is inaccessible", 3471 PrettyDescriptor(interface).c_str(), 3472 PrettyDescriptor(klass.get()).c_str()); 3473 return false; 3474 } 3475 } 3476 } 3477 // Mark the class as loaded. 3478 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3479 return true; 3480} 3481 3482bool ClassLinker::LinkSuperClass(const SirtRef<mirror::Class>& klass) { 3483 CHECK(!klass->IsPrimitive()); 3484 mirror::Class* super = klass->GetSuperClass(); 3485 if (klass.get() == GetClassRoot(kJavaLangObject)) { 3486 if (super != NULL) { 3487 ThrowClassFormatError(klass.get(), "java.lang.Object must not have a superclass"); 3488 return false; 3489 } 3490 return true; 3491 } 3492 if (super == NULL) { 3493 ThrowLinkageError(klass.get(), "No superclass defined for class %s", 3494 PrettyDescriptor(klass.get()).c_str()); 3495 return false; 3496 } 3497 // Verify 3498 if (super->IsFinal() || super->IsInterface()) { 3499 ThrowIncompatibleClassChangeError(klass.get(), "Superclass %s of %s is %s", 3500 PrettyDescriptor(super).c_str(), 3501 PrettyDescriptor(klass.get()).c_str(), 3502 super->IsFinal() ? "declared final" : "an interface"); 3503 return false; 3504 } 3505 if (!klass->CanAccess(super)) { 3506 ThrowIllegalAccessError(klass.get(), "Superclass %s is inaccessible to class %s", 3507 PrettyDescriptor(super).c_str(), 3508 PrettyDescriptor(klass.get()).c_str()); 3509 return false; 3510 } 3511 3512 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3513 if (super->IsFinalizable()) { 3514 klass->SetFinalizable(); 3515 } 3516 3517 // Inherit reference flags (if any) from the superclass. 3518 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3519 if (reference_flags != 0) { 3520 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3521 } 3522 // Disallow custom direct subclasses of java.lang.ref.Reference. 3523 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3524 ThrowLinkageError(klass.get(), 3525 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3526 PrettyDescriptor(klass.get()).c_str()); 3527 return false; 3528 } 3529 3530 if (kIsDebugBuild) { 3531 // Ensure super classes are fully resolved prior to resolving fields.. 3532 while (super != NULL) { 3533 CHECK(super->IsResolved()); 3534 super = super->GetSuperClass(); 3535 } 3536 } 3537 return true; 3538} 3539 3540// Populate the class vtable and itable. Compute return type indices. 3541bool ClassLinker::LinkMethods(const SirtRef<mirror::Class>& klass, 3542 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3543 if (klass->IsInterface()) { 3544 // No vtable. 3545 size_t count = klass->NumVirtualMethods(); 3546 if (!IsUint(16, count)) { 3547 ThrowClassFormatError(klass.get(), "Too many methods on interface: %zd", count); 3548 return false; 3549 } 3550 for (size_t i = 0; i < count; ++i) { 3551 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3552 } 3553 // Link interface method tables 3554 return LinkInterfaceMethods(klass, interfaces); 3555 } else { 3556 // Link virtual and interface method tables 3557 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3558 } 3559 return true; 3560} 3561 3562bool ClassLinker::LinkVirtualMethods(const SirtRef<mirror::Class>& klass) { 3563 Thread* self = Thread::Current(); 3564 if (klass->HasSuperClass()) { 3565 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3566 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3567 CHECK_LE(actual_count, max_count); 3568 // TODO: do not assign to the vtable field until it is fully constructed. 3569 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3570 vtable(self, klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count)); 3571 if (UNLIKELY(vtable.get() == NULL)) { 3572 CHECK(self->IsExceptionPending()); // OOME. 3573 return false; 3574 } 3575 // See if any of our virtual methods override the superclass. 3576 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3577 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3578 MethodHelper local_mh(local_method); 3579 size_t j = 0; 3580 for (; j < actual_count; ++j) { 3581 mirror::ArtMethod* super_method = vtable->Get(j); 3582 MethodHelper super_mh(super_method); 3583 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3584 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3585 if (super_method->IsFinal()) { 3586 ThrowLinkageError(klass.get(), "Method %s overrides final method in class %s", 3587 PrettyMethod(local_method).c_str(), 3588 super_mh.GetDeclaringClassDescriptor()); 3589 return false; 3590 } 3591 vtable->Set<false>(j, local_method); 3592 local_method->SetMethodIndex(j); 3593 break; 3594 } else { 3595 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3596 << " would have incorrectly overridden the package-private method in " 3597 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3598 } 3599 } 3600 } 3601 if (j == actual_count) { 3602 // Not overriding, append. 3603 vtable->Set<false>(actual_count, local_method); 3604 local_method->SetMethodIndex(actual_count); 3605 actual_count += 1; 3606 } 3607 } 3608 if (!IsUint(16, actual_count)) { 3609 ThrowClassFormatError(klass.get(), "Too many methods defined on class: %zd", actual_count); 3610 return false; 3611 } 3612 // Shrink vtable if possible 3613 CHECK_LE(actual_count, max_count); 3614 if (actual_count < max_count) { 3615 vtable.reset(vtable->CopyOf(self, actual_count)); 3616 if (UNLIKELY(vtable.get() == NULL)) { 3617 CHECK(self->IsExceptionPending()); // OOME. 3618 return false; 3619 } 3620 } 3621 klass->SetVTable(vtable.get()); 3622 } else { 3623 CHECK(klass.get() == GetClassRoot(kJavaLangObject)); 3624 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3625 if (!IsUint(16, num_virtual_methods)) { 3626 ThrowClassFormatError(klass.get(), "Too many methods: %d", num_virtual_methods); 3627 return false; 3628 } 3629 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3630 vtable(self, AllocArtMethodArray(self, num_virtual_methods)); 3631 if (UNLIKELY(vtable.get() == NULL)) { 3632 CHECK(self->IsExceptionPending()); // OOME. 3633 return false; 3634 } 3635 for (size_t i = 0; i < num_virtual_methods; ++i) { 3636 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3637 vtable->Set<false>(i, virtual_method); 3638 virtual_method->SetMethodIndex(i & 0xFFFF); 3639 } 3640 klass->SetVTable(vtable.get()); 3641 } 3642 return true; 3643} 3644 3645bool ClassLinker::LinkInterfaceMethods(const SirtRef<mirror::Class>& klass, 3646 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3647 // Set the imt table to be all conflicts by default. 3648 klass->SetImTable(Runtime::Current()->GetDefaultImt()); 3649 size_t super_ifcount; 3650 if (klass->HasSuperClass()) { 3651 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3652 } else { 3653 super_ifcount = 0; 3654 } 3655 size_t ifcount = super_ifcount; 3656 uint32_t num_interfaces; 3657 { 3658 ClassHelper kh(klass.get()); 3659 num_interfaces = 3660 interfaces.get() == nullptr ? kh.NumDirectInterfaces() : interfaces->GetLength(); 3661 ifcount += num_interfaces; 3662 for (size_t i = 0; i < num_interfaces; i++) { 3663 mirror::Class* interface = 3664 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3665 ifcount += interface->GetIfTableCount(); 3666 } 3667 } 3668 if (ifcount == 0) { 3669 // Class implements no interfaces. 3670 DCHECK_EQ(klass->GetIfTableCount(), 0); 3671 DCHECK(klass->GetIfTable() == NULL); 3672 return true; 3673 } 3674 if (ifcount == super_ifcount) { 3675 // Class implements same interfaces as parent, are any of these not marker interfaces? 3676 bool has_non_marker_interface = false; 3677 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3678 for (size_t i = 0; i < ifcount; ++i) { 3679 if (super_iftable->GetMethodArrayCount(i) > 0) { 3680 has_non_marker_interface = true; 3681 break; 3682 } 3683 } 3684 if (!has_non_marker_interface) { 3685 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3686 klass->SetIfTable(super_iftable); 3687 return true; 3688 } 3689 } 3690 Thread* self = Thread::Current(); 3691 SirtRef<mirror::IfTable> iftable(self, AllocIfTable(self, ifcount)); 3692 if (UNLIKELY(iftable.get() == NULL)) { 3693 CHECK(self->IsExceptionPending()); // OOME. 3694 return false; 3695 } 3696 if (super_ifcount != 0) { 3697 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3698 for (size_t i = 0; i < super_ifcount; i++) { 3699 mirror::Class* super_interface = super_iftable->GetInterface(i); 3700 iftable->SetInterface(i, super_interface); 3701 } 3702 } 3703 // Flatten the interface inheritance hierarchy. 3704 size_t idx = super_ifcount; 3705 for (size_t i = 0; i < num_interfaces; i++) { 3706 ClassHelper kh(klass.get()); 3707 mirror::Class* interface = 3708 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3709 DCHECK(interface != NULL); 3710 if (!interface->IsInterface()) { 3711 ClassHelper ih(interface); 3712 ThrowIncompatibleClassChangeError(klass.get(), "Class %s implements non-interface class %s", 3713 PrettyDescriptor(klass.get()).c_str(), 3714 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3715 return false; 3716 } 3717 // Check if interface is already in iftable 3718 bool duplicate = false; 3719 for (size_t j = 0; j < idx; j++) { 3720 mirror::Class* existing_interface = iftable->GetInterface(j); 3721 if (existing_interface == interface) { 3722 duplicate = true; 3723 break; 3724 } 3725 } 3726 if (!duplicate) { 3727 // Add this non-duplicate interface. 3728 iftable->SetInterface(idx++, interface); 3729 // Add this interface's non-duplicate super-interfaces. 3730 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3731 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3732 bool super_duplicate = false; 3733 for (size_t k = 0; k < idx; k++) { 3734 mirror::Class* existing_interface = iftable->GetInterface(k); 3735 if (existing_interface == super_interface) { 3736 super_duplicate = true; 3737 break; 3738 } 3739 } 3740 if (!super_duplicate) { 3741 iftable->SetInterface(idx++, super_interface); 3742 } 3743 } 3744 } 3745 } 3746 // Shrink iftable in case duplicates were found 3747 if (idx < ifcount) { 3748 iftable.reset(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3749 if (UNLIKELY(iftable.get() == NULL)) { 3750 CHECK(self->IsExceptionPending()); // OOME. 3751 return false; 3752 } 3753 ifcount = idx; 3754 } else { 3755 CHECK_EQ(idx, ifcount); 3756 } 3757 klass->SetIfTable(iftable.get()); 3758 3759 // If we're an interface, we don't need the vtable pointers, so we're done. 3760 if (klass->IsInterface()) { 3761 return true; 3762 } 3763 // Allocate imtable 3764 bool imtable_changed = false; 3765 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > imtable(self, AllocArtMethodArray(self, kImtSize)); 3766 if (UNLIKELY(imtable.get() == NULL)) { 3767 CHECK(self->IsExceptionPending()); // OOME. 3768 return false; 3769 } 3770 std::vector<mirror::ArtMethod*> miranda_list; 3771 for (size_t i = 0; i < ifcount; ++i) { 3772 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 3773 if (num_methods > 0) { 3774 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3775 method_array(self, AllocArtMethodArray(self, num_methods)); 3776 if (UNLIKELY(method_array.get() == nullptr)) { 3777 CHECK(self->IsExceptionPending()); // OOME. 3778 return false; 3779 } 3780 iftable->SetMethodArray(i, method_array.get()); 3781 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > vtable(self, 3782 klass->GetVTableDuringLinking()); 3783 for (size_t j = 0; j < num_methods; ++j) { 3784 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 3785 MethodHelper interface_mh(interface_method); 3786 int32_t k; 3787 // For each method listed in the interface's method list, find the 3788 // matching method in our class's method list. We want to favor the 3789 // subclass over the superclass, which just requires walking 3790 // back from the end of the vtable. (This only matters if the 3791 // superclass defines a private method and this class redefines 3792 // it -- otherwise it would use the same vtable slot. In .dex files 3793 // those don't end up in the virtual method table, so it shouldn't 3794 // matter which direction we go. We walk it backward anyway.) 3795 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3796 mirror::ArtMethod* vtable_method = vtable->Get(k); 3797 MethodHelper vtable_mh(vtable_method); 3798 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3799 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3800 ThrowIllegalAccessError(klass.get(), 3801 "Method '%s' implementing interface method '%s' is not public", 3802 PrettyMethod(vtable_method).c_str(), 3803 PrettyMethod(interface_method).c_str()); 3804 return false; 3805 } 3806 method_array->Set<false>(j, vtable_method); 3807 // Place method in imt if entry is empty, place conflict otherwise. 3808 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3809 if (imtable->Get(imt_index) == NULL) { 3810 imtable->Set<false>(imt_index, vtable_method); 3811 imtable_changed = true; 3812 } else { 3813 imtable->Set<false>(imt_index, Runtime::Current()->GetImtConflictMethod()); 3814 } 3815 break; 3816 } 3817 } 3818 if (k < 0) { 3819 SirtRef<mirror::ArtMethod> miranda_method(self, NULL); 3820 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3821 mirror::ArtMethod* mir_method = miranda_list[mir]; 3822 MethodHelper vtable_mh(mir_method); 3823 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3824 miranda_method.reset(miranda_list[mir]); 3825 break; 3826 } 3827 } 3828 if (miranda_method.get() == NULL) { 3829 // Point the interface table at a phantom slot. 3830 miranda_method.reset(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3831 if (UNLIKELY(miranda_method.get() == NULL)) { 3832 CHECK(self->IsExceptionPending()); // OOME. 3833 return false; 3834 } 3835 // TODO: If a methods move then the miranda_list may hold stale references. 3836 miranda_list.push_back(miranda_method.get()); 3837 } 3838 method_array->Set<false>(j, miranda_method.get()); 3839 } 3840 } 3841 } 3842 } 3843 if (imtable_changed) { 3844 // Fill in empty entries in interface method table with conflict. 3845 mirror::ArtMethod* imt_conflict_method = Runtime::Current()->GetImtConflictMethod(); 3846 for (size_t i = 0; i < kImtSize; i++) { 3847 if (imtable->Get(i) == NULL) { 3848 imtable->Set<false>(i, imt_conflict_method); 3849 } 3850 } 3851 klass->SetImTable(imtable.get()); 3852 } 3853 if (!miranda_list.empty()) { 3854 int old_method_count = klass->NumVirtualMethods(); 3855 int new_method_count = old_method_count + miranda_list.size(); 3856 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3857 if (old_method_count == 0) { 3858 virtuals = AllocArtMethodArray(self, new_method_count); 3859 } else { 3860 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3861 } 3862 if (UNLIKELY(virtuals == NULL)) { 3863 CHECK(self->IsExceptionPending()); // OOME. 3864 return false; 3865 } 3866 klass->SetVirtualMethods(virtuals); 3867 3868 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3869 vtable(self, klass->GetVTableDuringLinking()); 3870 CHECK(vtable.get() != NULL); 3871 int old_vtable_count = vtable->GetLength(); 3872 int new_vtable_count = old_vtable_count + miranda_list.size(); 3873 vtable.reset(vtable->CopyOf(self, new_vtable_count)); 3874 if (UNLIKELY(vtable.get() == NULL)) { 3875 CHECK(self->IsExceptionPending()); // OOME. 3876 return false; 3877 } 3878 for (size_t i = 0; i < miranda_list.size(); ++i) { 3879 mirror::ArtMethod* method = miranda_list[i]; 3880 // Leave the declaring class alone as type indices are relative to it 3881 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3882 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3883 klass->SetVirtualMethod(old_method_count + i, method); 3884 vtable->Set<false>(old_vtable_count + i, method); 3885 } 3886 // TODO: do not assign to the vtable field until it is fully constructed. 3887 klass->SetVTable(vtable.get()); 3888 } 3889 3890 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3891 for (int i = 0; i < vtable->GetLength(); ++i) { 3892 CHECK(vtable->Get(i) != NULL); 3893 } 3894 3895// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3896 3897 return true; 3898} 3899 3900bool ClassLinker::LinkInstanceFields(const SirtRef<mirror::Class>& klass) { 3901 CHECK(klass.get() != NULL); 3902 return LinkFields(klass, false); 3903} 3904 3905bool ClassLinker::LinkStaticFields(const SirtRef<mirror::Class>& klass) { 3906 CHECK(klass.get() != NULL); 3907 size_t allocated_class_size = klass->GetClassSize(); 3908 bool success = LinkFields(klass, true); 3909 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3910 return success; 3911} 3912 3913struct LinkFieldsComparator { 3914 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3915 } 3916 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3917 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 3918 NO_THREAD_SAFETY_ANALYSIS { 3919 // First come reference fields, then 64-bit, and finally 32-bit 3920 FieldHelper fh1(field1); 3921 Primitive::Type type1 = fh1.GetTypeAsPrimitiveType(); 3922 FieldHelper fh2(field2); 3923 Primitive::Type type2 = fh2.GetTypeAsPrimitiveType(); 3924 if (type1 != type2) { 3925 bool is_primitive1 = type1 != Primitive::kPrimNot; 3926 bool is_primitive2 = type2 != Primitive::kPrimNot; 3927 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3928 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3929 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 3930 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 3931 if (order1 != order2) { 3932 return order1 < order2; 3933 } 3934 } 3935 // same basic group? then sort by string. 3936 const char* name1 = fh1.GetName(); 3937 const char* name2 = fh2.GetName(); 3938 return strcmp(name1, name2) < 0; 3939 } 3940}; 3941 3942bool ClassLinker::LinkFields(const SirtRef<mirror::Class>& klass, bool is_static) { 3943 size_t num_fields = 3944 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3945 3946 mirror::ObjectArray<mirror::ArtField>* fields = 3947 is_static ? klass->GetSFields() : klass->GetIFields(); 3948 3949 // Initialize size and field_offset 3950 size_t size; 3951 MemberOffset field_offset(0); 3952 if (is_static) { 3953 size = klass->GetClassSize(); 3954 field_offset = mirror::Class::FieldsOffset(); 3955 } else { 3956 mirror::Class* super_class = klass->GetSuperClass(); 3957 if (super_class != NULL) { 3958 CHECK(super_class->IsResolved()); 3959 field_offset = MemberOffset(super_class->GetObjectSize()); 3960 } 3961 size = field_offset.Uint32Value(); 3962 } 3963 3964 CHECK_EQ(num_fields == 0, fields == NULL); 3965 3966 // we want a relatively stable order so that adding new fields 3967 // minimizes disruption of C++ version such as Class and Method. 3968 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3969 for (size_t i = 0; i < num_fields; i++) { 3970 mirror::ArtField* f = fields->Get(i); 3971 CHECK(f != NULL); 3972 grouped_and_sorted_fields.push_back(f); 3973 } 3974 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 3975 LinkFieldsComparator()); 3976 3977 // References should be at the front. 3978 size_t current_field = 0; 3979 size_t num_reference_fields = 0; 3980 for (; current_field < num_fields; current_field++) { 3981 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3982 FieldHelper fh(field); 3983 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3984 bool isPrimitive = type != Primitive::kPrimNot; 3985 if (isPrimitive) { 3986 break; // past last reference, move on to the next phase 3987 } 3988 grouped_and_sorted_fields.pop_front(); 3989 num_reference_fields++; 3990 fields->Set<false>(current_field, field); 3991 field->SetOffset(field_offset); 3992 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3993 } 3994 3995 // Now we want to pack all of the double-wide fields together. If 3996 // we're not aligned, though, we want to shuffle one 32-bit field 3997 // into place. If we can't find one, we'll have to pad it. 3998 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 3999 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4000 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4001 FieldHelper fh(field); 4002 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4003 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 4004 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4005 continue; 4006 } 4007 fields->Set<false>(current_field++, field); 4008 field->SetOffset(field_offset); 4009 // drop the consumed field 4010 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4011 break; 4012 } 4013 // whether we found a 32-bit field for padding or not, we advance 4014 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4015 } 4016 4017 // Alignment is good, shuffle any double-wide fields forward, and 4018 // finish assigning field offsets to all fields. 4019 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 4020 while (!grouped_and_sorted_fields.empty()) { 4021 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4022 grouped_and_sorted_fields.pop_front(); 4023 FieldHelper fh(field); 4024 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4025 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 4026 fields->Set<false>(current_field, field); 4027 field->SetOffset(field_offset); 4028 field_offset = MemberOffset(field_offset.Uint32Value() + 4029 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4030 ? sizeof(uint64_t) 4031 : sizeof(uint32_t))); 4032 current_field++; 4033 } 4034 4035 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4036 if (!is_static && 4037 (strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0)) { 4038 // We know there are no non-reference fields in the Reference classes, and we know 4039 // that 'referent' is alphabetically last, so this is easy... 4040 CHECK_EQ(num_reference_fields, num_fields); 4041 FieldHelper fh(fields->Get(num_fields - 1)); 4042 CHECK_STREQ(fh.GetName(), "referent"); 4043 --num_reference_fields; 4044 } 4045 4046 if (kIsDebugBuild) { 4047 // Make sure that all reference fields appear before 4048 // non-reference fields, and all double-wide fields are aligned. 4049 bool seen_non_ref = false; 4050 for (size_t i = 0; i < num_fields; i++) { 4051 mirror::ArtField* field = fields->Get(i); 4052 if (false) { // enable to debug field layout 4053 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4054 << " class=" << PrettyClass(klass.get()) 4055 << " field=" << PrettyField(field) 4056 << " offset=" 4057 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4058 } 4059 FieldHelper fh(field); 4060 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4061 bool is_primitive = type != Primitive::kPrimNot; 4062 if ((strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0) 4063 && (strcmp("referent", fh.GetName()) == 0)) { 4064 is_primitive = true; // We lied above, so we have to expect a lie here. 4065 } 4066 if (is_primitive) { 4067 if (!seen_non_ref) { 4068 seen_non_ref = true; 4069 DCHECK_EQ(num_reference_fields, i); 4070 } 4071 } else { 4072 DCHECK(!seen_non_ref); 4073 } 4074 } 4075 if (!seen_non_ref) { 4076 DCHECK_EQ(num_fields, num_reference_fields); 4077 } 4078 } 4079 size = field_offset.Uint32Value(); 4080 // Update klass 4081 if (is_static) { 4082 klass->SetNumReferenceStaticFields(num_reference_fields); 4083 klass->SetClassSize(size); 4084 } else { 4085 klass->SetNumReferenceInstanceFields(num_reference_fields); 4086 if (!klass->IsVariableSize()) { 4087 DCHECK_GE(size, sizeof(mirror::Object)) << ClassHelper(klass.get()).GetDescriptor(); 4088 size_t previous_size = klass->GetObjectSize(); 4089 if (previous_size != 0) { 4090 // Make sure that we didn't originally have an incorrect size. 4091 CHECK_EQ(previous_size, size); 4092 } 4093 klass->SetObjectSize(size); 4094 } 4095 } 4096 return true; 4097} 4098 4099// Set the bitmap of reference offsets, refOffsets, from the ifields 4100// list. 4101void ClassLinker::CreateReferenceInstanceOffsets(const SirtRef<mirror::Class>& klass) { 4102 uint32_t reference_offsets = 0; 4103 mirror::Class* super_class = klass->GetSuperClass(); 4104 if (super_class != NULL) { 4105 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4106 // If our superclass overflowed, we don't stand a chance. 4107 if (reference_offsets == CLASS_WALK_SUPER) { 4108 klass->SetReferenceInstanceOffsets(reference_offsets); 4109 return; 4110 } 4111 } 4112 CreateReferenceOffsets(klass, false, reference_offsets); 4113} 4114 4115void ClassLinker::CreateReferenceStaticOffsets(const SirtRef<mirror::Class>& klass) { 4116 CreateReferenceOffsets(klass, true, 0); 4117} 4118 4119void ClassLinker::CreateReferenceOffsets(const SirtRef<mirror::Class>& klass, bool is_static, 4120 uint32_t reference_offsets) { 4121 size_t num_reference_fields = 4122 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4123 : klass->NumReferenceInstanceFieldsDuringLinking(); 4124 mirror::ObjectArray<mirror::ArtField>* fields = 4125 is_static ? klass->GetSFields() : klass->GetIFields(); 4126 // All of the fields that contain object references are guaranteed 4127 // to be at the beginning of the fields list. 4128 for (size_t i = 0; i < num_reference_fields; ++i) { 4129 // Note that byte_offset is the offset from the beginning of 4130 // object, not the offset into instance data 4131 mirror::ArtField* field = fields->Get(i); 4132 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4133 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4134 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4135 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4136 CHECK_NE(new_bit, 0U); 4137 reference_offsets |= new_bit; 4138 } else { 4139 reference_offsets = CLASS_WALK_SUPER; 4140 break; 4141 } 4142 } 4143 // Update fields in klass 4144 if (is_static) { 4145 klass->SetReferenceStaticOffsets(reference_offsets); 4146 } else { 4147 klass->SetReferenceInstanceOffsets(reference_offsets); 4148 } 4149} 4150 4151mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4152 const SirtRef<mirror::DexCache>& dex_cache) { 4153 DCHECK(dex_cache.get() != nullptr); 4154 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4155 if (resolved != NULL) { 4156 return resolved; 4157 } 4158 uint32_t utf16_length; 4159 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4160 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4161 dex_cache->SetResolvedString(string_idx, string); 4162 return string; 4163} 4164 4165mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4166 mirror::Class* referrer) { 4167 Thread* self = Thread::Current(); 4168 SirtRef<mirror::DexCache> dex_cache(self, referrer->GetDexCache()); 4169 SirtRef<mirror::ClassLoader> class_loader(self, referrer->GetClassLoader()); 4170 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4171} 4172 4173mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4174 const SirtRef<mirror::DexCache>& dex_cache, 4175 const SirtRef<mirror::ClassLoader>& class_loader) { 4176 DCHECK(dex_cache.get() != NULL); 4177 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4178 if (resolved == NULL) { 4179 Thread* self = Thread::Current(); 4180 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4181 resolved = FindClass(self, descriptor, class_loader); 4182 if (resolved != NULL) { 4183 // TODO: we used to throw here if resolved's class loader was not the 4184 // boot class loader. This was to permit different classes with the 4185 // same name to be loaded simultaneously by different loaders 4186 dex_cache->SetResolvedType(type_idx, resolved); 4187 } else { 4188 CHECK(self->IsExceptionPending()) 4189 << "Expected pending exception for failed resolution of: " << descriptor; 4190 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4191 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 4192 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4193 DCHECK(resolved == NULL); // No SirtRef needed to preserve resolved. 4194 self->ClearException(); 4195 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4196 self->GetException(NULL)->SetCause(cause.get()); 4197 } 4198 } 4199 } 4200 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4201 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4202 return resolved; 4203} 4204 4205mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 4206 uint32_t method_idx, 4207 const SirtRef<mirror::DexCache>& dex_cache, 4208 const SirtRef<mirror::ClassLoader>& class_loader, 4209 mirror::ArtMethod* referrer, 4210 InvokeType type) { 4211 DCHECK(dex_cache.get() != NULL); 4212 // Check for hit in the dex cache. 4213 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4214 if (resolved != NULL && !resolved->IsRuntimeMethod()) { 4215 return resolved; 4216 } 4217 // Fail, get the declaring class. 4218 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4219 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4220 if (klass == NULL) { 4221 DCHECK(Thread::Current()->IsExceptionPending()); 4222 return NULL; 4223 } 4224 // Scan using method_idx, this saves string compares but will only hit for matching dex 4225 // caches/files. 4226 switch (type) { 4227 case kDirect: // Fall-through. 4228 case kStatic: 4229 resolved = klass->FindDirectMethod(dex_cache.get(), method_idx); 4230 break; 4231 case kInterface: 4232 resolved = klass->FindInterfaceMethod(dex_cache.get(), method_idx); 4233 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4234 break; 4235 case kSuper: // Fall-through. 4236 case kVirtual: 4237 resolved = klass->FindVirtualMethod(dex_cache.get(), method_idx); 4238 break; 4239 default: 4240 LOG(FATAL) << "Unreachable - invocation type: " << type; 4241 } 4242 if (resolved == NULL) { 4243 // Search by name, which works across dex files. 4244 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4245 const Signature signature = dex_file.GetMethodSignature(method_id); 4246 switch (type) { 4247 case kDirect: // Fall-through. 4248 case kStatic: 4249 resolved = klass->FindDirectMethod(name, signature); 4250 break; 4251 case kInterface: 4252 resolved = klass->FindInterfaceMethod(name, signature); 4253 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4254 break; 4255 case kSuper: // Fall-through. 4256 case kVirtual: 4257 resolved = klass->FindVirtualMethod(name, signature); 4258 break; 4259 } 4260 } 4261 if (resolved != NULL) { 4262 // We found a method, check for incompatible class changes. 4263 if (resolved->CheckIncompatibleClassChange(type)) { 4264 resolved = NULL; 4265 } 4266 } 4267 if (resolved != NULL) { 4268 // Be a good citizen and update the dex cache to speed subsequent calls. 4269 dex_cache->SetResolvedMethod(method_idx, resolved); 4270 return resolved; 4271 } else { 4272 // We failed to find the method which means either an access error, an incompatible class 4273 // change, or no such method. First try to find the method among direct and virtual methods. 4274 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4275 const Signature signature = dex_file.GetMethodSignature(method_id); 4276 switch (type) { 4277 case kDirect: 4278 case kStatic: 4279 resolved = klass->FindVirtualMethod(name, signature); 4280 break; 4281 case kInterface: 4282 case kVirtual: 4283 case kSuper: 4284 resolved = klass->FindDirectMethod(name, signature); 4285 break; 4286 } 4287 4288 // If we found something, check that it can be accessed by the referrer. 4289 if (resolved != NULL && referrer != NULL) { 4290 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4291 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4292 if (!referring_class->CanAccess(methods_class)) { 4293 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4294 resolved, type); 4295 return NULL; 4296 } else if (!referring_class->CanAccessMember(methods_class, 4297 resolved->GetAccessFlags())) { 4298 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4299 return NULL; 4300 } 4301 } 4302 4303 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4304 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4305 switch (type) { 4306 case kDirect: 4307 case kStatic: 4308 if (resolved != NULL) { 4309 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4310 } else { 4311 resolved = klass->FindInterfaceMethod(name, signature); 4312 if (resolved != NULL) { 4313 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4314 } else { 4315 ThrowNoSuchMethodError(type, klass, name, signature); 4316 } 4317 } 4318 break; 4319 case kInterface: 4320 if (resolved != NULL) { 4321 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4322 } else { 4323 resolved = klass->FindVirtualMethod(name, signature); 4324 if (resolved != NULL) { 4325 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4326 } else { 4327 ThrowNoSuchMethodError(type, klass, name, signature); 4328 } 4329 } 4330 break; 4331 case kSuper: 4332 ThrowNoSuchMethodError(type, klass, name, signature); 4333 break; 4334 case kVirtual: 4335 if (resolved != NULL) { 4336 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4337 } else { 4338 resolved = klass->FindInterfaceMethod(name, signature); 4339 if (resolved != NULL) { 4340 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4341 } else { 4342 ThrowNoSuchMethodError(type, klass, name, signature); 4343 } 4344 } 4345 break; 4346 } 4347 DCHECK(Thread::Current()->IsExceptionPending()); 4348 return NULL; 4349 } 4350} 4351 4352mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4353 const SirtRef<mirror::DexCache>& dex_cache, 4354 const SirtRef<mirror::ClassLoader>& class_loader, 4355 bool is_static) { 4356 DCHECK(dex_cache.get() != nullptr); 4357 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4358 if (resolved != NULL) { 4359 return resolved; 4360 } 4361 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4362 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4363 if (klass == NULL) { 4364 DCHECK(Thread::Current()->IsExceptionPending()); 4365 return NULL; 4366 } 4367 4368 if (is_static) { 4369 resolved = klass->FindStaticField(dex_cache.get(), field_idx); 4370 } else { 4371 resolved = klass->FindInstanceField(dex_cache.get(), field_idx); 4372 } 4373 4374 if (resolved == NULL) { 4375 const char* name = dex_file.GetFieldName(field_id); 4376 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4377 if (is_static) { 4378 resolved = klass->FindStaticField(name, type); 4379 } else { 4380 resolved = klass->FindInstanceField(name, type); 4381 } 4382 if (resolved == NULL) { 4383 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 4384 return NULL; 4385 } 4386 } 4387 dex_cache->SetResolvedField(field_idx, resolved); 4388 return resolved; 4389} 4390 4391mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4392 uint32_t field_idx, 4393 const SirtRef<mirror::DexCache>& dex_cache, 4394 const SirtRef<mirror::ClassLoader>& class_loader) { 4395 DCHECK(dex_cache.get() != nullptr); 4396 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4397 if (resolved != NULL) { 4398 return resolved; 4399 } 4400 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4401 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4402 if (klass == NULL) { 4403 DCHECK(Thread::Current()->IsExceptionPending()); 4404 return NULL; 4405 } 4406 4407 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4408 StringPiece type(dex_file.StringDataByIdx( 4409 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4410 resolved = klass->FindField(name, type); 4411 if (resolved != NULL) { 4412 dex_cache->SetResolvedField(field_idx, resolved); 4413 } else { 4414 ThrowNoSuchFieldError("", klass, type, name); 4415 } 4416 return resolved; 4417} 4418 4419const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4420 uint32_t* length) { 4421 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4422 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4423 const DexFile& dex_file = *dex_cache->GetDexFile(); 4424 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4425 return dex_file.GetMethodShorty(method_id, length); 4426} 4427 4428void ClassLinker::DumpAllClasses(int flags) { 4429 if (dex_cache_image_class_lookup_required_) { 4430 MoveImageClassesToClassTable(); 4431 } 4432 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4433 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4434 std::vector<mirror::Class*> all_classes; 4435 { 4436 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4437 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 4438 all_classes.push_back(it.second); 4439 } 4440 } 4441 4442 for (size_t i = 0; i < all_classes.size(); ++i) { 4443 all_classes[i]->DumpClass(std::cerr, flags); 4444 } 4445} 4446 4447void ClassLinker::DumpForSigQuit(std::ostream& os) { 4448 if (dex_cache_image_class_lookup_required_) { 4449 MoveImageClassesToClassTable(); 4450 } 4451 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4452 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4453} 4454 4455size_t ClassLinker::NumLoadedClasses() { 4456 if (dex_cache_image_class_lookup_required_) { 4457 MoveImageClassesToClassTable(); 4458 } 4459 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4460 return class_table_.size(); 4461} 4462 4463pid_t ClassLinker::GetClassesLockOwner() { 4464 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4465} 4466 4467pid_t ClassLinker::GetDexLockOwner() { 4468 return dex_lock_.GetExclusiveOwnerTid(); 4469} 4470 4471void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4472 DCHECK(!init_done_); 4473 4474 DCHECK(klass != NULL); 4475 DCHECK(klass->GetClassLoader() == NULL); 4476 4477 DCHECK(class_roots_ != NULL); 4478 DCHECK(class_roots_->Get(class_root) == NULL); 4479 class_roots_->Set<false>(class_root, klass); 4480} 4481 4482} // namespace art 4483