class_linker.cc revision 62f0512bf6d9bc6141358bf22e93afa70dc58b1a
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <fcntl.h> 20#include <sys/file.h> 21#include <sys/stat.h> 22 23#include <deque> 24#include <string> 25#include <utility> 26#include <vector> 27 28#include "base/casts.h" 29#include "base/logging.h" 30#include "base/stl_util.h" 31#include "base/unix_file/fd_file.h" 32#include "class_linker-inl.h" 33#include "compiler_callbacks.h" 34#include "debugger.h" 35#include "dex_file-inl.h" 36#include "gc/accounting/card_table-inl.h" 37#include "gc/accounting/heap_bitmap.h" 38#include "gc/heap.h" 39#include "gc/space/image_space.h" 40#include "intern_table.h" 41#include "interpreter/interpreter.h" 42#include "leb128.h" 43#include "oat.h" 44#include "oat_file.h" 45#include "mirror/art_field-inl.h" 46#include "mirror/art_method-inl.h" 47#include "mirror/class.h" 48#include "mirror/class-inl.h" 49#include "mirror/class_loader.h" 50#include "mirror/dex_cache-inl.h" 51#include "mirror/iftable-inl.h" 52#include "mirror/object-inl.h" 53#include "mirror/object_array-inl.h" 54#include "mirror/proxy.h" 55#include "mirror/stack_trace_element.h" 56#include "object_utils.h" 57#include "os.h" 58#include "runtime.h" 59#include "entrypoints/entrypoint_utils.h" 60#include "ScopedLocalRef.h" 61#include "scoped_thread_state_change.h" 62#include "sirt_ref.h" 63#include "stack_indirect_reference_table.h" 64#include "thread.h" 65#include "UniquePtr.h" 66#include "utils.h" 67#include "verifier/method_verifier.h" 68#include "well_known_classes.h" 69 70namespace art { 71 72static void ThrowNoClassDefFoundError(const char* fmt, ...) 73 __attribute__((__format__(__printf__, 1, 2))) 74 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 75static void ThrowNoClassDefFoundError(const char* fmt, ...) { 76 va_list args; 77 va_start(args, fmt); 78 Thread* self = Thread::Current(); 79 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 80 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 81 va_end(args); 82} 83 84static void ThrowEarlierClassFailure(mirror::Class* c) 85 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 86 // The class failed to initialize on a previous attempt, so we want to throw 87 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 88 // failed in verification, in which case v2 5.4.1 says we need to re-throw 89 // the previous error. 90 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 91 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 92 } 93 94 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 95 Thread* self = Thread::Current(); 96 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 97 if (c->GetVerifyErrorClass() != NULL) { 98 // TODO: change the verifier to store an _instance_, with a useful detail message? 99 ClassHelper ve_ch(c->GetVerifyErrorClass()); 100 self->ThrowNewException(throw_location, ve_ch.GetDescriptor(), PrettyDescriptor(c).c_str()); 101 } else { 102 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 103 PrettyDescriptor(c).c_str()); 104 } 105} 106 107static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 108 Thread* self = Thread::Current(); 109 JNIEnv* env = self->GetJniEnv(); 110 111 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 112 CHECK(cause.get() != NULL); 113 114 env->ExceptionClear(); 115 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 116 env->Throw(cause.get()); 117 118 // We only wrap non-Error exceptions; an Error can just be used as-is. 119 if (!is_error) { 120 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 121 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 122 } 123} 124 125static size_t Hash(const char* s) { 126 // This is the java.lang.String hashcode for convenience, not interoperability. 127 size_t hash = 0; 128 for (; *s != '\0'; ++s) { 129 hash = hash * 31 + *s; 130 } 131 return hash; 132} 133 134const char* ClassLinker::class_roots_descriptors_[] = { 135 "Ljava/lang/Class;", 136 "Ljava/lang/Object;", 137 "[Ljava/lang/Class;", 138 "[Ljava/lang/Object;", 139 "Ljava/lang/String;", 140 "Ljava/lang/DexCache;", 141 "Ljava/lang/ref/Reference;", 142 "Ljava/lang/reflect/ArtField;", 143 "Ljava/lang/reflect/ArtMethod;", 144 "Ljava/lang/reflect/Proxy;", 145 "[Ljava/lang/String;", 146 "[Ljava/lang/reflect/ArtField;", 147 "[Ljava/lang/reflect/ArtMethod;", 148 "Ljava/lang/ClassLoader;", 149 "Ljava/lang/Throwable;", 150 "Ljava/lang/ClassNotFoundException;", 151 "Ljava/lang/StackTraceElement;", 152 "Z", 153 "B", 154 "C", 155 "D", 156 "F", 157 "I", 158 "J", 159 "S", 160 "V", 161 "[Z", 162 "[B", 163 "[C", 164 "[D", 165 "[F", 166 "[I", 167 "[J", 168 "[S", 169 "[Ljava/lang/StackTraceElement;", 170}; 171 172ClassLinker::ClassLinker(InternTable* intern_table) 173 // dex_lock_ is recursive as it may be used in stack dumping. 174 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 175 dex_cache_image_class_lookup_required_(false), 176 failed_dex_cache_class_lookups_(0), 177 class_roots_(nullptr), 178 array_iftable_(nullptr), 179 find_array_class_cache_next_victim_(0), 180 init_done_(false), 181 log_new_dex_caches_roots_(false), 182 log_new_class_table_roots_(false), 183 intern_table_(intern_table), 184 portable_resolution_trampoline_(nullptr), 185 quick_resolution_trampoline_(nullptr), 186 portable_imt_conflict_trampoline_(nullptr), 187 quick_imt_conflict_trampoline_(nullptr), 188 quick_generic_jni_trampoline_(nullptr) { 189 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 190 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 191} 192 193void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 194 VLOG(startup) << "ClassLinker::Init"; 195 CHECK(Runtime::Current()->IsCompiler()); 196 197 CHECK(!init_done_); 198 199 // java_lang_Class comes first, it's needed for AllocClass 200 Thread* self = Thread::Current(); 201 gc::Heap* heap = Runtime::Current()->GetHeap(); 202 // The GC can't handle an object with a null class since we can't get the size of this object. 203 heap->IncrementDisableMovingGC(self); 204 SirtRef<mirror::Class> java_lang_Class(self, down_cast<mirror::Class*>( 205 heap->AllocNonMovableObject<true>(self, nullptr, sizeof(mirror::ClassClass)))); 206 CHECK(java_lang_Class.get() != NULL); 207 mirror::Class::SetClassClass(java_lang_Class.get()); 208 java_lang_Class->SetClass(java_lang_Class.get()); 209 if (kUseBrooksPointer) { 210 java_lang_Class->AssertSelfBrooksPointer(); 211 } 212 java_lang_Class->SetClassSize(sizeof(mirror::ClassClass)); 213 heap->DecrementDisableMovingGC(self); 214 // AllocClass(mirror::Class*) can now be used 215 216 // Class[] is used for reflection support. 217 SirtRef<mirror::Class> class_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 218 class_array_class->SetComponentType(java_lang_Class.get()); 219 220 // java_lang_Object comes next so that object_array_class can be created. 221 SirtRef<mirror::Class> java_lang_Object(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 222 CHECK(java_lang_Object.get() != NULL); 223 // backfill Object as the super class of Class. 224 java_lang_Class->SetSuperClass(java_lang_Object.get()); 225 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 226 227 // Object[] next to hold class roots. 228 SirtRef<mirror::Class> object_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 229 object_array_class->SetComponentType(java_lang_Object.get()); 230 231 // Setup the char class to be used for char[]. 232 SirtRef<mirror::Class> char_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 233 234 // Setup the char[] class to be used for String. 235 SirtRef<mirror::Class> char_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 236 char_array_class->SetComponentType(char_class.get()); 237 mirror::CharArray::SetArrayClass(char_array_class.get()); 238 239 // Setup String. 240 SirtRef<mirror::Class> java_lang_String(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::StringClass))); 241 mirror::String::SetClass(java_lang_String.get()); 242 java_lang_String->SetObjectSize(sizeof(mirror::String)); 243 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 244 245 // Create storage for root classes, save away our work so far (requires descriptors). 246 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.get(), 247 kClassRootsMax); 248 CHECK(class_roots_ != NULL); 249 SetClassRoot(kJavaLangClass, java_lang_Class.get()); 250 SetClassRoot(kJavaLangObject, java_lang_Object.get()); 251 SetClassRoot(kClassArrayClass, class_array_class.get()); 252 SetClassRoot(kObjectArrayClass, object_array_class.get()); 253 SetClassRoot(kCharArrayClass, char_array_class.get()); 254 SetClassRoot(kJavaLangString, java_lang_String.get()); 255 256 // Setup the primitive type classes. 257 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 258 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 259 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 260 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 261 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 262 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 263 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 264 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 265 266 // Create array interface entries to populate once we can load system classes. 267 array_iftable_ = AllocIfTable(self, 2); 268 269 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 270 SirtRef<mirror::Class> int_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class))); 271 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 272 mirror::IntArray::SetArrayClass(int_array_class.get()); 273 SetClassRoot(kIntArrayClass, int_array_class.get()); 274 275 // now that these are registered, we can use AllocClass() and AllocObjectArray 276 277 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 278 SirtRef<mirror::Class> 279 java_lang_DexCache(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::DexCacheClass))); 280 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.get()); 281 java_lang_DexCache->SetObjectSize(sizeof(mirror::DexCache)); 282 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 283 284 // Constructor, Field, Method, and AbstractMethod are necessary so that FindClass can link members. 285 SirtRef<mirror::Class> java_lang_reflect_ArtField(self, AllocClass(self, java_lang_Class.get(), 286 sizeof(mirror::ArtFieldClass))); 287 CHECK(java_lang_reflect_ArtField.get() != NULL); 288 java_lang_reflect_ArtField->SetObjectSize(sizeof(mirror::ArtField)); 289 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.get()); 290 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 291 mirror::ArtField::SetClass(java_lang_reflect_ArtField.get()); 292 293 SirtRef<mirror::Class> java_lang_reflect_ArtMethod(self, AllocClass(self, java_lang_Class.get(), 294 sizeof(mirror::ArtMethodClass))); 295 CHECK(java_lang_reflect_ArtMethod.get() != NULL); 296 java_lang_reflect_ArtMethod->SetObjectSize(sizeof(mirror::ArtMethod)); 297 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.get()); 298 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 299 300 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.get()); 301 302 // Set up array classes for string, field, method 303 SirtRef<mirror::Class> object_array_string(self, AllocClass(self, java_lang_Class.get(), 304 sizeof(mirror::Class))); 305 object_array_string->SetComponentType(java_lang_String.get()); 306 SetClassRoot(kJavaLangStringArrayClass, object_array_string.get()); 307 308 SirtRef<mirror::Class> object_array_art_method(self, AllocClass(self, java_lang_Class.get(), 309 sizeof(mirror::Class))); 310 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.get()); 311 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.get()); 312 313 SirtRef<mirror::Class> object_array_art_field(self, AllocClass(self, java_lang_Class.get(), 314 sizeof(mirror::Class))); 315 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.get()); 316 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.get()); 317 318 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 319 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 320 // these roots. 321 CHECK_NE(0U, boot_class_path.size()); 322 for (size_t i = 0; i != boot_class_path.size(); ++i) { 323 const DexFile* dex_file = boot_class_path[i]; 324 CHECK(dex_file != NULL); 325 AppendToBootClassPath(*dex_file); 326 } 327 328 // now we can use FindSystemClass 329 330 // run char class through InitializePrimitiveClass to finish init 331 InitializePrimitiveClass(char_class.get(), Primitive::kPrimChar); 332 SetClassRoot(kPrimitiveChar, char_class.get()); // needs descriptor 333 334 // Create runtime resolution and imt conflict methods. Also setup the default imt. 335 Runtime* runtime = Runtime::Current(); 336 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 337 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 338 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 339 340 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 341 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 342 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 343 CHECK_EQ(java_lang_Object.get(), Object_class); 344 CHECK_EQ(java_lang_Object->GetObjectSize(), sizeof(mirror::Object)); 345 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 346 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 347 CHECK_EQ(java_lang_String.get(), String_class); 348 CHECK_EQ(java_lang_String->GetObjectSize(), sizeof(mirror::String)); 349 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 350 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 351 CHECK_EQ(java_lang_String.get(), String_class); 352 CHECK_EQ(java_lang_DexCache.get(), DexCache_class); 353 CHECK_EQ(java_lang_DexCache->GetObjectSize(), sizeof(mirror::DexCache)); 354 355 // Setup the primitive array type classes - can't be done until Object has a vtable. 356 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 357 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 358 359 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 360 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 361 362 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 363 CHECK_EQ(char_array_class.get(), found_char_array_class); 364 365 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 366 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 367 368 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 369 CHECK_EQ(int_array_class.get(), found_int_array_class); 370 371 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 372 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 373 374 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 375 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 376 377 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 378 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 379 380 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 381 CHECK_EQ(class_array_class.get(), found_class_array_class); 382 383 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 384 CHECK_EQ(object_array_class.get(), found_object_array_class); 385 386 // Setup the single, global copy of "iftable". 387 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 388 CHECK(java_lang_Cloneable != NULL); 389 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 390 CHECK(java_io_Serializable != NULL); 391 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 392 // crawl up and explicitly list all of the supers as well. 393 array_iftable_->SetInterface(0, java_lang_Cloneable); 394 array_iftable_->SetInterface(1, java_io_Serializable); 395 396 // Sanity check Class[] and Object[]'s interfaces. 397 ClassHelper kh(class_array_class.get()); 398 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 399 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 400 kh.ChangeClass(object_array_class.get()); 401 CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0)); 402 CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1)); 403 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 404 // dex_cache_ fields and register them in class_table_. 405 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 406 CHECK_EQ(java_lang_Class.get(), Class_class); 407 408 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 409 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 410 CHECK_EQ(java_lang_reflect_ArtMethod.get(), Art_method_class); 411 412 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 413 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 414 CHECK_EQ(java_lang_reflect_ArtField.get(), Art_field_class); 415 416 mirror::Class* String_array_class = FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 417 CHECK_EQ(object_array_string.get(), String_array_class); 418 419 mirror::Class* Art_method_array_class = 420 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 421 CHECK_EQ(object_array_art_method.get(), Art_method_array_class); 422 423 mirror::Class* Art_field_array_class = 424 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 425 CHECK_EQ(object_array_art_field.get(), Art_field_array_class); 426 427 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 428 429 // Create java.lang.reflect.Proxy root. 430 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 431 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 432 433 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 434 mirror::Class* java_lang_ref_Reference = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 435 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference); 436 mirror::Class* java_lang_ref_FinalizerReference = FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 437 java_lang_ref_FinalizerReference->SetAccessFlags( 438 java_lang_ref_FinalizerReference->GetAccessFlags() | 439 kAccClassIsReference | kAccClassIsFinalizerReference); 440 mirror::Class* java_lang_ref_PhantomReference = FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 441 java_lang_ref_PhantomReference->SetAccessFlags( 442 java_lang_ref_PhantomReference->GetAccessFlags() | 443 kAccClassIsReference | kAccClassIsPhantomReference); 444 mirror::Class* java_lang_ref_SoftReference = FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 445 java_lang_ref_SoftReference->SetAccessFlags( 446 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 447 mirror::Class* java_lang_ref_WeakReference = FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 448 java_lang_ref_WeakReference->SetAccessFlags( 449 java_lang_ref_WeakReference->GetAccessFlags() | 450 kAccClassIsReference | kAccClassIsWeakReference); 451 452 // Setup the ClassLoader, verifying the object_size_. 453 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 454 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), sizeof(mirror::ClassLoader)); 455 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 456 457 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 458 // java.lang.StackTraceElement as a convenience. 459 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 460 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 461 SetClassRoot(kJavaLangClassNotFoundException, FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 462 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 463 SetClassRoot(kJavaLangStackTraceElementArrayClass, FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 464 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 465 466 FinishInit(self); 467 468 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 469} 470 471void ClassLinker::FinishInit(Thread* self) { 472 VLOG(startup) << "ClassLinker::FinishInit entering"; 473 474 // Let the heap know some key offsets into java.lang.ref instances 475 // Note: we hard code the field indexes here rather than using FindInstanceField 476 // as the types of the field can't be resolved prior to the runtime being 477 // fully initialized 478 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 479 mirror::Class* java_lang_ref_FinalizerReference = 480 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 481 482 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 483 FieldHelper fh(pendingNext); 484 CHECK_STREQ(fh.GetName(), "pendingNext"); 485 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 486 487 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 488 fh.ChangeField(queue); 489 CHECK_STREQ(fh.GetName(), "queue"); 490 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 491 492 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 493 fh.ChangeField(queueNext); 494 CHECK_STREQ(fh.GetName(), "queueNext"); 495 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 496 497 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 498 fh.ChangeField(referent); 499 CHECK_STREQ(fh.GetName(), "referent"); 500 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 501 502 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 503 fh.ChangeField(zombie); 504 CHECK_STREQ(fh.GetName(), "zombie"); 505 CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;"); 506 507 // ensure all class_roots_ are initialized 508 for (size_t i = 0; i < kClassRootsMax; i++) { 509 ClassRoot class_root = static_cast<ClassRoot>(i); 510 mirror::Class* klass = GetClassRoot(class_root); 511 CHECK(klass != NULL); 512 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 513 // note SetClassRoot does additional validation. 514 // if possible add new checks there to catch errors early 515 } 516 517 CHECK(array_iftable_ != NULL); 518 519 // disable the slow paths in FindClass and CreatePrimitiveClass now 520 // that Object, Class, and Object[] are setup 521 init_done_ = true; 522 523 VLOG(startup) << "ClassLinker::FinishInit exiting"; 524} 525 526void ClassLinker::RunRootClinits() { 527 Thread* self = Thread::Current(); 528 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 529 mirror::Class* c = GetClassRoot(ClassRoot(i)); 530 if (!c->IsArrayClass() && !c->IsPrimitive()) { 531 SirtRef<mirror::Class> sirt_class(self, GetClassRoot(ClassRoot(i))); 532 EnsureInitialized(sirt_class, true, true); 533 self->AssertNoPendingException(); 534 } 535 } 536} 537 538bool ClassLinker::GenerateOatFile(const char* dex_filename, 539 int oat_fd, 540 const char* oat_cache_filename, 541 std::string* error_msg) { 542 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 543 std::string dex2oat(GetAndroidRoot()); 544 dex2oat += (kIsDebugBuild ? "/bin/dex2oatd" : "/bin/dex2oat"); 545 546 gc::Heap* heap = Runtime::Current()->GetHeap(); 547 std::string boot_image_option("--boot-image="); 548 boot_image_option += heap->GetImageSpace()->GetImageFilename(); 549 550 std::string dex_file_option("--dex-file="); 551 dex_file_option += dex_filename; 552 553 std::string oat_fd_option("--oat-fd="); 554 StringAppendF(&oat_fd_option, "%d", oat_fd); 555 556 std::string oat_location_option("--oat-location="); 557 oat_location_option += oat_cache_filename; 558 559 std::vector<std::string> argv; 560 argv.push_back(dex2oat); 561 argv.push_back("--runtime-arg"); 562 argv.push_back("-Xms64m"); 563 argv.push_back("--runtime-arg"); 564 argv.push_back("-Xmx64m"); 565 argv.push_back("--runtime-arg"); 566 argv.push_back("-classpath"); 567 argv.push_back("--runtime-arg"); 568 argv.push_back(Runtime::Current()->GetClassPathString()); 569 570 argv.push_back("--runtime-arg"); 571 std::string checkstr = "-implicit-checks"; 572 573 int nchecks = 0; 574 char checksep = ':'; 575 576 if (!Runtime::Current()->ExplicitNullChecks()) { 577 checkstr += checksep; 578 checksep = ','; 579 checkstr += "null"; 580 ++nchecks; 581 } 582 if (!Runtime::Current()->ExplicitSuspendChecks()) { 583 checkstr += checksep; 584 checksep = ','; 585 checkstr += "suspend"; 586 ++nchecks; 587 } 588 589 if (!Runtime::Current()->ExplicitStackOverflowChecks()) { 590 checkstr += checksep; 591 checksep = ','; 592 checkstr += "stack"; 593 ++nchecks; 594 } 595 596 if (nchecks == 0) { 597 checkstr += ":none"; 598 } 599 argv.push_back(checkstr); 600 601 if (!kIsTargetBuild) { 602 argv.push_back("--host"); 603 } 604 argv.push_back(boot_image_option); 605 argv.push_back(dex_file_option); 606 argv.push_back(oat_fd_option); 607 argv.push_back(oat_location_option); 608 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 609 for (size_t i = 0; i < compiler_options.size(); ++i) { 610 argv.push_back(compiler_options[i].c_str()); 611 } 612 613 return Exec(argv, error_msg); 614} 615 616const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 617 WriterMutexLock mu(Thread::Current(), dex_lock_); 618 if (kIsDebugBuild) { 619 for (size_t i = 0; i < oat_files_.size(); ++i) { 620 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 621 } 622 } 623 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 624 oat_files_.push_back(oat_file); 625 return oat_file; 626} 627 628OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 629 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 630 OatFile* oat_file = space->ReleaseOatFile(); 631 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 632 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 633 return *oat_file; 634} 635 636const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 637 const char* dex_location = dex_file.GetLocation().c_str(); 638 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 639 return FindOpenedOatFileFromDexLocation(dex_location, &dex_location_checksum); 640} 641 642const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation(const char* dex_location, 643 const uint32_t* const dex_location_checksum) { 644 ReaderMutexLock mu(Thread::Current(), dex_lock_); 645 for (size_t i = 0; i < oat_files_.size(); i++) { 646 const OatFile* oat_file = oat_files_[i]; 647 DCHECK(oat_file != NULL); 648 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 649 dex_location_checksum, 650 false); 651 if (oat_dex_file != NULL) { 652 return oat_file; 653 } 654 } 655 return NULL; 656} 657 658const DexFile* ClassLinker::FindDexFileInOatLocation(const char* dex_location, 659 uint32_t dex_location_checksum, 660 const char* oat_location, 661 std::string* error_msg) { 662 UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 663 !Runtime::Current()->IsCompiler(), 664 error_msg)); 665 if (oat_file.get() == nullptr) { 666 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 667 error_msg->c_str()); 668 return nullptr; 669 } 670 Runtime* runtime = Runtime::Current(); 671 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 672 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 673 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 674 if (expected_image_oat_checksum != actual_image_oat_checksum) { 675 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 676 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 677 actual_image_oat_checksum); 678 return nullptr; 679 } 680 681 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 682 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 683 if (expected_image_oat_offset != actual_image_oat_offset) { 684 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 685 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 686 actual_image_oat_offset); 687 return nullptr; 688 } 689 // TODO: this registers the oat file now as we may use the oat_dex_file later and we want the 690 // intern behavior of RegisterOatFile. However, if we take an early return we could remove 691 // the oat file. 692 const OatFile* opened_oat_file = RegisterOatFile(oat_file.release()); 693 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, 694 &dex_location_checksum); 695 if (oat_dex_file == nullptr) { 696 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 697 dex_location); 698 return nullptr; 699 } 700 uint32_t expected_dex_checksum = dex_location_checksum; 701 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 702 if (expected_dex_checksum != actual_dex_checksum) { 703 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 704 "found 0x%x", oat_location, expected_dex_checksum, 705 actual_dex_checksum); 706 return nullptr; 707 } 708 return oat_dex_file->OpenDexFile(error_msg); 709} 710 711class ScopedFlock { 712 public: 713 ScopedFlock() {} 714 715 bool Init(const char* filename, std::string* error_msg) { 716 while (true) { 717 file_.reset(OS::OpenFileWithFlags(filename, O_CREAT | O_RDWR)); 718 if (file_.get() == NULL) { 719 *error_msg = StringPrintf("Failed to open file '%s'", filename); 720 return false; 721 } 722 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_EX)); 723 if (flock_result != 0) { 724 *error_msg = StringPrintf("Failed to lock file '%s': %s", filename, strerror(errno)); 725 return false; 726 } 727 struct stat fstat_stat; 728 int fstat_result = TEMP_FAILURE_RETRY(fstat(file_->Fd(), &fstat_stat)); 729 if (fstat_result != 0) { 730 *error_msg = StringPrintf("Failed to fstat file '%s': %s", filename, strerror(errno)); 731 return false; 732 } 733 struct stat stat_stat; 734 int stat_result = TEMP_FAILURE_RETRY(stat(filename, &stat_stat)); 735 if (stat_result != 0) { 736 PLOG(WARNING) << "Failed to stat, will retry: " << filename; 737 // ENOENT can happen if someone racing with us unlinks the file we created so just retry. 738 continue; 739 } 740 if (fstat_stat.st_dev != stat_stat.st_dev || fstat_stat.st_ino != stat_stat.st_ino) { 741 LOG(WARNING) << "File changed while locking, will retry: " << filename; 742 continue; 743 } 744 return true; 745 } 746 } 747 748 File& GetFile() { 749 return *file_; 750 } 751 752 ~ScopedFlock() { 753 if (file_.get() != NULL) { 754 int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_UN)); 755 CHECK_EQ(0, flock_result); 756 } 757 } 758 759 private: 760 UniquePtr<File> file_; 761 762 DISALLOW_COPY_AND_ASSIGN(ScopedFlock); 763}; 764 765const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation(const char* dex_location, 766 uint32_t dex_location_checksum, 767 const char* oat_location, 768 std::string* error_msg) { 769 // We play a locking game here so that if two different processes 770 // race to generate (or worse, one tries to open a partial generated 771 // file) we will be okay. This is actually common with apps that use 772 // DexClassLoader to work around the dex method reference limit and 773 // that have a background service running in a separate process. 774 ScopedFlock scoped_flock; 775 if (!scoped_flock.Init(oat_location, error_msg)) { 776 return nullptr; 777 } 778 779 // Check if we already have an up-to-date output file 780 const DexFile* dex_file = FindDexFileInOatLocation(dex_location, dex_location_checksum, 781 oat_location, error_msg); 782 if (dex_file != nullptr) { 783 return dex_file; 784 } 785 VLOG(class_linker) << "Failed to find dex file '" << dex_location << "' in oat location '" 786 << oat_location << "': " << *error_msg; 787 error_msg->clear(); 788 789 // Generate the output oat file for the dex file 790 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 791 if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location, error_msg)) { 792 CHECK(!error_msg->empty()); 793 return nullptr; 794 } 795 const OatFile* oat_file = OatFile::Open(oat_location, oat_location, NULL, 796 !Runtime::Current()->IsCompiler(), 797 error_msg); 798 if (oat_file == nullptr) { 799 *error_msg = StringPrintf("Failed to open generated oat file '%s': %s", 800 oat_location, error_msg->c_str()); 801 return nullptr; 802 } 803 oat_file = RegisterOatFile(oat_file); 804 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 805 &dex_location_checksum); 806 if (oat_dex_file == nullptr) { 807 *error_msg = StringPrintf("Failed to find dex file '%s' (checksum 0x%x) in generated out file " 808 "'%s'", dex_location, dex_location_checksum, oat_location); 809 return nullptr; 810 } 811 const DexFile* result = oat_dex_file->OpenDexFile(error_msg); 812 CHECK(result != nullptr) << *error_msg; 813 CHECK_EQ(dex_location_checksum, result->GetLocationChecksum()) 814 << "dex_location=" << dex_location << " oat_location=" << oat_location << std::hex 815 << " dex_location_checksum=" << dex_location_checksum 816 << " DexFile::GetLocationChecksum()=" << result->GetLocationChecksum(); 817 return result; 818} 819 820bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 821 const char* dex_location, 822 uint32_t dex_location_checksum, 823 std::string* error_msg) { 824 Runtime* runtime = Runtime::Current(); 825 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 826 uint32_t image_oat_checksum = image_header.GetOatChecksum(); 827 uintptr_t image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 828 bool image_check = ((oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum) 829 && (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 830 831 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum); 832 if (oat_dex_file == NULL) { 833 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 834 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 835 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 836 for (size_t i = 0; i < oat_dex_files.size(); i++) { 837 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 838 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 839 oat_file->GetLocation().c_str(), 840 oat_dex_file->GetDexFileLocation().c_str()); 841 } 842 return false; 843 } 844 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 845 846 if (image_check && dex_check) { 847 return true; 848 } 849 850 if (!image_check) { 851 ScopedObjectAccess soa(Thread::Current()); 852 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with (0x%x, %" PRIdPTR ")", 853 oat_file->GetLocation().c_str(), 854 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 855 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 856 image_oat_checksum, image_oat_data_begin); 857 } 858 if (!dex_check) { 859 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 860 oat_file->GetLocation().c_str(), 861 oat_dex_file->GetDexFileLocationChecksum(), 862 dex_location, dex_location_checksum); 863 } 864 return false; 865} 866 867const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const std::string& oat_file_location, 868 const char* dex_location, 869 std::string* error_msg, 870 bool* open_failed) { 871 UniquePtr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 872 if (oat_file.get() == nullptr) { 873 *open_failed = true; 874 return nullptr; 875 } 876 *open_failed = false; 877 uint32_t dex_location_checksum; 878 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 879 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 880 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 881 // directory. 882 const OatFile* opened_oat_file = oat_file.release(); 883 opened_oat_file = RegisterOatFile(opened_oat_file); 884 const OatFile::OatDexFile* oat_dex_file = opened_oat_file->GetOatDexFile(dex_location, NULL); 885 if (oat_dex_file == nullptr) { 886 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 887 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 888 error_msg->c_str()); 889 return nullptr; 890 } 891 return oat_dex_file->OpenDexFile(error_msg); 892 } 893 894 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 895 error_msg); 896 if (!verified) { 897 return nullptr; 898 } 899 const OatFile* opened_oat_file = oat_file.release(); 900 opened_oat_file = RegisterOatFile(opened_oat_file); 901 return opened_oat_file->GetOatDexFile(dex_location, 902 &dex_location_checksum)->OpenDexFile(error_msg); 903} 904 905const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const char* dex_location, 906 const uint32_t* const dex_location_checksum, 907 std::string* error_msg) { 908 const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location, 909 dex_location_checksum); 910 if (open_oat_file != nullptr) { 911 const OatFile::OatDexFile* oat_dex_file = open_oat_file->GetOatDexFile(dex_location, 912 dex_location_checksum); 913 return oat_dex_file->OpenDexFile(error_msg); 914 } 915 916 // Look for an existing file next to dex. for example, for 917 // /foo/bar/baz.jar, look for /foo/bar/baz.odex. 918 std::string odex_filename(OatFile::DexFilenameToOdexFilename(dex_location)); 919 bool open_failed; 920 const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(odex_filename, dex_location, 921 error_msg, &open_failed); 922 if (dex_file != nullptr) { 923 return dex_file; 924 } 925 if (dex_location_checksum == nullptr) { 926 *error_msg = StringPrintf("Failed to open oat file from %s and no classes.dex found in %s: %s", 927 odex_filename.c_str(), dex_location, error_msg->c_str()); 928 return nullptr; 929 } 930 931 std::string cache_error_msg; 932 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location)); 933 dex_file = VerifyAndOpenDexFileFromOatFile(cache_location, dex_location, &cache_error_msg, 934 &open_failed); 935 if (dex_file != nullptr) { 936 return dex_file; 937 } 938 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 939 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 940 } 941 VLOG(class_linker) << "Failed to open oat file from " << odex_filename 942 << " (error '" << *error_msg << "') or " << cache_location 943 << " (error '" << cache_error_msg << "')."; 944 945 // Try to generate oat file if it wasn't found or was obsolete. 946 error_msg->clear(); 947 return FindOrCreateOatFileForDexLocation(dex_location, *dex_location_checksum, 948 cache_location.c_str(), error_msg); 949} 950 951const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 952 ReaderMutexLock mu(Thread::Current(), dex_lock_); 953 for (size_t i = 0; i < oat_files_.size(); i++) { 954 const OatFile* oat_file = oat_files_[i]; 955 DCHECK(oat_file != nullptr); 956 if (oat_file->GetLocation() == oat_location) { 957 return oat_file; 958 } 959 } 960 return nullptr; 961} 962 963const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 964 std::string* error_msg) { 965 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 966 if (oat_file != nullptr) { 967 return oat_file; 968 } 969 970 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 971 error_msg); 972 if (oat_file == NULL) { 973 return NULL; 974 } 975 return oat_file; 976} 977 978static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 979 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 980 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 981 982 DCHECK(obj != NULL); 983 DCHECK(class_linker != NULL); 984 985 if (obj->IsArtMethod()) { 986 mirror::ArtMethod* method = obj->AsArtMethod(); 987 if (!method->IsNative()) { 988 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 989 if (method != Runtime::Current()->GetResolutionMethod()) { 990 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 991 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 992 } 993 } 994 } 995} 996 997void ClassLinker::InitFromImage() { 998 VLOG(startup) << "ClassLinker::InitFromImage entering"; 999 CHECK(!init_done_); 1000 1001 Thread* self = Thread::Current(); 1002 gc::Heap* heap = Runtime::Current()->GetHeap(); 1003 gc::space::ImageSpace* space = heap->GetImageSpace(); 1004 dex_cache_image_class_lookup_required_ = true; 1005 CHECK(space != NULL); 1006 OatFile& oat_file = GetImageOatFile(space); 1007 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1008 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1009 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 1010 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1011 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1012 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1013 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1014 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1015 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1016 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1017 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1018 1019 SirtRef<mirror::ObjectArray<mirror::Class> > class_roots( 1020 self, 1021 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>()); 1022 class_roots_ = class_roots.get(); 1023 1024 // Special case of setting up the String class early so that we can test arbitrary objects 1025 // as being Strings or not 1026 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1027 1028 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1029 static_cast<uint32_t>(dex_caches->GetLength())); 1030 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1031 SirtRef<mirror::DexCache> dex_cache(self, dex_caches->Get(i)); 1032 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1033 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1034 nullptr); 1035 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1036 std::string error_msg; 1037 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1038 if (dex_file == NULL) { 1039 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1040 << " from within oat file " << oat_file.GetLocation() 1041 << " error '" << error_msg << "'"; 1042 } 1043 1044 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1045 1046 AppendToBootClassPath(*dex_file, dex_cache); 1047 } 1048 1049 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1050 // bitmap walk. 1051 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1052 1053 // Set entry point to interpreter if in InterpretOnly mode. 1054 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1055 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1056 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1057 } 1058 1059 // reinit class_roots_ 1060 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1061 class_roots_ = class_roots.get(); 1062 1063 // reinit array_iftable_ from any array class instance, they should be == 1064 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1065 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1066 // String class root was set above 1067 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1068 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1069 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1070 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1071 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1072 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1073 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1074 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1075 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1076 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1077 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1078 1079 FinishInit(self); 1080 1081 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1082} 1083 1084// Keep in sync with InitCallback. Anything we visit, we need to 1085// reinit references to when reinitializing a ClassLinker from a 1086// mapped image. 1087void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1088 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1089 Thread* self = Thread::Current(); 1090 { 1091 ReaderMutexLock mu(self, dex_lock_); 1092 if ((flags & kVisitRootFlagAllRoots) != 0) { 1093 for (mirror::DexCache*& dex_cache : dex_caches_) { 1094 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1095 } 1096 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1097 for (size_t index : new_dex_cache_roots_) { 1098 callback(reinterpret_cast<mirror::Object**>(&dex_caches_[index]), arg, 0, kRootVMInternal); 1099 } 1100 } 1101 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1102 new_dex_cache_roots_.clear(); 1103 } 1104 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1105 log_new_dex_caches_roots_ = true; 1106 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1107 log_new_dex_caches_roots_ = false; 1108 } 1109 } 1110 { 1111 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 1112 if ((flags & kVisitRootFlagAllRoots) != 0) { 1113 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1114 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1115 } 1116 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1117 for (auto& pair : new_class_roots_) { 1118 mirror::Object* old_ref = pair.second; 1119 callback(reinterpret_cast<mirror::Object**>(&pair.second), arg, 0, kRootStickyClass); 1120 if (UNLIKELY(pair.second != old_ref)) { 1121 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1122 // corresponding object. This is slow, but luckily for us, this may only happen with a 1123 // concurrent moving GC. 1124 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1125 it != end && it->first == pair.first; ++it) { 1126 // If the class stored matches the old class, update it to the new value. 1127 if (old_ref == it->second) { 1128 it->second = pair.second; 1129 } 1130 } 1131 } 1132 } 1133 } 1134 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1135 new_class_roots_.clear(); 1136 } 1137 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1138 log_new_class_table_roots_ = true; 1139 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1140 log_new_class_table_roots_ = false; 1141 } 1142 // We deliberately ignore the class roots in the image since we 1143 // handle image roots by using the MS/CMS rescanning of dirty cards. 1144 } 1145 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1146 DCHECK(array_iftable_ != nullptr); 1147 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1148 if (find_array_class_cache_[i] != nullptr) { 1149 callback(reinterpret_cast<mirror::Object**>(&find_array_class_cache_[i]), arg, 0, 1150 kRootVMInternal); 1151 } 1152 } 1153} 1154 1155void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1156 if (dex_cache_image_class_lookup_required_) { 1157 MoveImageClassesToClassTable(); 1158 } 1159 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1160 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 1161 if (!visitor(it.second, arg)) { 1162 return; 1163 } 1164 } 1165} 1166 1167static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1168 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1169 classes->insert(c); 1170 return true; 1171} 1172 1173void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1174 std::set<mirror::Class*> classes; 1175 VisitClasses(GetClassesVisitor, &classes); 1176 for (mirror::Class* klass : classes) { 1177 if (!visitor(klass, arg)) { 1178 return; 1179 } 1180 } 1181} 1182 1183ClassLinker::~ClassLinker() { 1184 mirror::Class::ResetClass(); 1185 mirror::String::ResetClass(); 1186 mirror::ArtField::ResetClass(); 1187 mirror::ArtMethod::ResetClass(); 1188 mirror::BooleanArray::ResetArrayClass(); 1189 mirror::ByteArray::ResetArrayClass(); 1190 mirror::CharArray::ResetArrayClass(); 1191 mirror::DoubleArray::ResetArrayClass(); 1192 mirror::FloatArray::ResetArrayClass(); 1193 mirror::IntArray::ResetArrayClass(); 1194 mirror::LongArray::ResetArrayClass(); 1195 mirror::ShortArray::ResetArrayClass(); 1196 mirror::Throwable::ResetClass(); 1197 mirror::StackTraceElement::ResetClass(); 1198 STLDeleteElements(&boot_class_path_); 1199 STLDeleteElements(&oat_files_); 1200} 1201 1202mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1203 gc::Heap* heap = Runtime::Current()->GetHeap(); 1204 SirtRef<mirror::Class> dex_cache_class(self, GetClassRoot(kJavaLangDexCache)); 1205 SirtRef<mirror::DexCache> dex_cache( 1206 self, down_cast<mirror::DexCache*>( 1207 heap->AllocObject<true>(self, dex_cache_class.get(), dex_cache_class->GetObjectSize()))); 1208 if (dex_cache.get() == NULL) { 1209 return NULL; 1210 } 1211 SirtRef<mirror::String> 1212 location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str())); 1213 if (location.get() == NULL) { 1214 return NULL; 1215 } 1216 SirtRef<mirror::ObjectArray<mirror::String> > 1217 strings(self, AllocStringArray(self, dex_file.NumStringIds())); 1218 if (strings.get() == NULL) { 1219 return NULL; 1220 } 1221 SirtRef<mirror::ObjectArray<mirror::Class> > 1222 types(self, AllocClassArray(self, dex_file.NumTypeIds())); 1223 if (types.get() == NULL) { 1224 return NULL; 1225 } 1226 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 1227 methods(self, AllocArtMethodArray(self, dex_file.NumMethodIds())); 1228 if (methods.get() == NULL) { 1229 return NULL; 1230 } 1231 SirtRef<mirror::ObjectArray<mirror::ArtField> > 1232 fields(self, AllocArtFieldArray(self, dex_file.NumFieldIds())); 1233 if (fields.get() == NULL) { 1234 return NULL; 1235 } 1236 dex_cache->Init(&dex_file, location.get(), strings.get(), types.get(), methods.get(), 1237 fields.get()); 1238 return dex_cache.get(); 1239} 1240 1241// Used to initialize a class in the allocation code path to ensure it is guarded by a StoreStore 1242// fence. 1243class InitializeClassVisitor { 1244 public: 1245 explicit InitializeClassVisitor(uint32_t class_size) : class_size_(class_size) { 1246 } 1247 1248 void operator()(mirror::Object* obj, size_t usable_size) const 1249 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1250 DCHECK_LE(class_size_, usable_size); 1251 // Avoid AsClass as object is not yet in live bitmap or allocation stack. 1252 mirror::Class* klass = down_cast<mirror::Class*>(obj); 1253 // DCHECK(klass->IsClass()); 1254 klass->SetClassSize(class_size_); 1255 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1256 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1257 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1258 } 1259 1260 private: 1261 const uint32_t class_size_; 1262 1263 DISALLOW_COPY_AND_ASSIGN(InitializeClassVisitor); 1264}; 1265 1266mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1267 uint32_t class_size) { 1268 DCHECK_GE(class_size, sizeof(mirror::Class)); 1269 gc::Heap* heap = Runtime::Current()->GetHeap(); 1270 InitializeClassVisitor visitor(class_size); 1271 mirror::Object* k = 1272 kMovingClasses ? heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) 1273 : heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1274 if (UNLIKELY(k == nullptr)) { 1275 CHECK(self->IsExceptionPending()); // OOME. 1276 return nullptr; 1277 } 1278 return k->AsClass(); 1279} 1280 1281mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1282 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1283} 1284 1285mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1286 return down_cast<mirror::ArtField*>( 1287 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1288} 1289 1290mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1291 return down_cast<mirror::ArtMethod*>( 1292 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1293} 1294 1295mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1296 Thread* self, size_t length) { 1297 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1298 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1299} 1300 1301static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1302 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1303 DCHECK(klass != NULL); 1304 // Wait for the class if it has not already been linked. 1305 if (!klass->IsResolved() && !klass->IsErroneous()) { 1306 SirtRef<mirror::Class> sirt_class(self, klass); 1307 ObjectLock<mirror::Class> lock(self, &sirt_class); 1308 // Check for circular dependencies between classes. 1309 if (!sirt_class->IsResolved() && sirt_class->GetClinitThreadId() == self->GetTid()) { 1310 ThrowClassCircularityError(sirt_class.get()); 1311 sirt_class->SetStatus(mirror::Class::kStatusError, self); 1312 return nullptr; 1313 } 1314 // Wait for the pending initialization to complete. 1315 while (!sirt_class->IsResolved() && !sirt_class->IsErroneous()) { 1316 lock.WaitIgnoringInterrupts(); 1317 } 1318 klass = sirt_class.get(); 1319 } 1320 if (klass->IsErroneous()) { 1321 ThrowEarlierClassFailure(klass); 1322 return nullptr; 1323 } 1324 // Return the loaded class. No exceptions should be pending. 1325 CHECK(klass->IsResolved()) << PrettyClass(klass); 1326 self->AssertNoPendingException(); 1327 return klass; 1328} 1329 1330mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1331 const SirtRef<mirror::ClassLoader>& class_loader) { 1332 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1333 DCHECK(self != nullptr); 1334 self->AssertNoPendingException(); 1335 if (descriptor[1] == '\0') { 1336 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1337 // for primitive classes that aren't backed by dex files. 1338 return FindPrimitiveClass(descriptor[0]); 1339 } 1340 // Find the class in the loaded classes table. 1341 mirror::Class* klass = LookupClass(descriptor, class_loader.get()); 1342 if (klass != NULL) { 1343 return EnsureResolved(self, klass); 1344 } 1345 // Class is not yet loaded. 1346 if (descriptor[0] == '[') { 1347 return CreateArrayClass(self, descriptor, class_loader); 1348 } else if (class_loader.get() == nullptr) { 1349 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1350 if (pair.second != NULL) { 1351 SirtRef<mirror::ClassLoader> class_loader(self, nullptr); 1352 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1353 } 1354 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1355 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1356 // throw of a NoClassDefFoundError. 1357 if (IsInBootClassPath(descriptor)) { 1358 mirror::Class* system_class = FindSystemClass(self, descriptor); 1359 CHECK(system_class != NULL); 1360 return system_class; 1361 } 1362 // Next try the compile time class path. 1363 const std::vector<const DexFile*>* class_path; 1364 { 1365 ScopedObjectAccessUnchecked soa(self); 1366 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1367 soa.AddLocalReference<jobject>(class_loader.get())); 1368 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1369 } 1370 1371 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1372 if (pair.second != NULL) { 1373 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1374 } 1375 1376 } else { 1377 ScopedObjectAccessUnchecked soa(self); 1378 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1379 soa.AddLocalReference<jobject>(class_loader.get())); 1380 std::string class_name_string(DescriptorToDot(descriptor)); 1381 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1382 { 1383 ScopedThreadStateChange tsc(self, kNative); 1384 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1385 soa.Env()->NewStringUTF(class_name_string.c_str())); 1386 if (class_name_object.get() == NULL) { 1387 return NULL; 1388 } 1389 CHECK(class_loader_object.get() != NULL); 1390 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1391 WellKnownClasses::java_lang_ClassLoader_loadClass, 1392 class_name_object.get())); 1393 } 1394 if (self->IsExceptionPending()) { 1395 // If the ClassLoader threw, pass that exception up. 1396 return NULL; 1397 } else if (result.get() == NULL) { 1398 // broken loader - throw NPE to be compatible with Dalvik 1399 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1400 class_name_string.c_str()).c_str()); 1401 return NULL; 1402 } else { 1403 // success, return mirror::Class* 1404 return soa.Decode<mirror::Class*>(result.get()); 1405 } 1406 } 1407 1408 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1409 return NULL; 1410} 1411 1412mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1413 const SirtRef<mirror::ClassLoader>& class_loader, 1414 const DexFile& dex_file, 1415 const DexFile::ClassDef& dex_class_def) { 1416 Thread* self = Thread::Current(); 1417 SirtRef<mirror::Class> klass(self, NULL); 1418 // Load the class from the dex file. 1419 if (UNLIKELY(!init_done_)) { 1420 // finish up init of hand crafted class_roots_ 1421 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1422 klass.reset(GetClassRoot(kJavaLangObject)); 1423 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1424 klass.reset(GetClassRoot(kJavaLangClass)); 1425 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1426 klass.reset(GetClassRoot(kJavaLangString)); 1427 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1428 klass.reset(GetClassRoot(kJavaLangDexCache)); 1429 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1430 klass.reset(GetClassRoot(kJavaLangReflectArtField)); 1431 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1432 klass.reset(GetClassRoot(kJavaLangReflectArtMethod)); 1433 } else { 1434 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1435 } 1436 } else { 1437 klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1438 } 1439 if (UNLIKELY(klass.get() == NULL)) { 1440 CHECK(self->IsExceptionPending()); // Expect an OOME. 1441 return NULL; 1442 } 1443 klass->SetDexCache(FindDexCache(dex_file)); 1444 LoadClass(dex_file, dex_class_def, klass, class_loader.get()); 1445 // Check for a pending exception during load 1446 if (self->IsExceptionPending()) { 1447 klass->SetStatus(mirror::Class::kStatusError, self); 1448 return NULL; 1449 } 1450 ObjectLock<mirror::Class> lock(self, &klass); 1451 klass->SetClinitThreadId(self->GetTid()); 1452 // Add the newly loaded class to the loaded classes table. 1453 mirror::Class* existing = InsertClass(descriptor, klass.get(), Hash(descriptor)); 1454 if (existing != NULL) { 1455 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1456 // this thread to block. 1457 return EnsureResolved(self, existing); 1458 } 1459 // Finish loading (if necessary) by finding parents 1460 CHECK(!klass->IsLoaded()); 1461 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1462 // Loading failed. 1463 klass->SetStatus(mirror::Class::kStatusError, self); 1464 return NULL; 1465 } 1466 CHECK(klass->IsLoaded()); 1467 // Link the class (if necessary) 1468 CHECK(!klass->IsResolved()); 1469 // TODO: Use fast jobjects? 1470 SirtRef<mirror::ObjectArray<mirror::Class> > interfaces(self, nullptr); 1471 if (!LinkClass(self, klass, interfaces)) { 1472 // Linking failed. 1473 klass->SetStatus(mirror::Class::kStatusError, self); 1474 return NULL; 1475 } 1476 CHECK(klass->IsResolved()); 1477 1478 /* 1479 * We send CLASS_PREPARE events to the debugger from here. The 1480 * definition of "preparation" is creating the static fields for a 1481 * class and initializing them to the standard default values, but not 1482 * executing any code (that comes later, during "initialization"). 1483 * 1484 * We did the static preparation in LinkClass. 1485 * 1486 * The class has been prepared and resolved but possibly not yet verified 1487 * at this point. 1488 */ 1489 Dbg::PostClassPrepare(klass.get()); 1490 1491 return klass.get(); 1492} 1493 1494// Precomputes size that will be needed for Class, matching LinkStaticFields 1495uint32_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1496 const DexFile::ClassDef& dex_class_def) { 1497 const byte* class_data = dex_file.GetClassData(dex_class_def); 1498 size_t num_ref = 0; 1499 size_t num_32 = 0; 1500 size_t num_64 = 0; 1501 if (class_data != NULL) { 1502 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1503 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1504 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1505 char c = descriptor[0]; 1506 if (c == 'L' || c == '[') { 1507 num_ref++; 1508 } else if (c == 'J' || c == 'D') { 1509 num_64++; 1510 } else { 1511 num_32++; 1512 } 1513 } 1514 } 1515 // start with generic class data 1516 uint32_t size = sizeof(mirror::Class); 1517 // follow with reference fields which must be contiguous at start 1518 size += (num_ref * sizeof(uint32_t)); 1519 // if there are 64-bit fields to add, make sure they are aligned 1520 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1521 if (num_32 != 0) { 1522 // use an available 32-bit field for padding 1523 num_32--; 1524 } 1525 size += sizeof(uint32_t); // either way, we are adding a word 1526 DCHECK_EQ(size, RoundUp(size, 8)); 1527 } 1528 // tack on any 64-bit fields now that alignment is assured 1529 size += (num_64 * sizeof(uint64_t)); 1530 // tack on any remaining 32-bit fields 1531 size += (num_32 * sizeof(uint32_t)); 1532 return size; 1533} 1534 1535const OatFile::OatClass* ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1536 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1537 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1538 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1539 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1540 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1541 &dex_location_checksum); 1542 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1543 const OatFile::OatClass* oat_class = oat_dex_file->GetOatClass(class_def_idx); 1544 CHECK(oat_class != NULL) << dex_file.GetLocation() << " " << class_def_idx; 1545 return oat_class; 1546} 1547 1548static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1549 uint32_t method_idx) { 1550 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1551 const byte* class_data = dex_file.GetClassData(class_def); 1552 CHECK(class_data != NULL); 1553 ClassDataItemIterator it(dex_file, class_data); 1554 // Skip fields 1555 while (it.HasNextStaticField()) { 1556 it.Next(); 1557 } 1558 while (it.HasNextInstanceField()) { 1559 it.Next(); 1560 } 1561 // Process methods 1562 size_t class_def_method_index = 0; 1563 while (it.HasNextDirectMethod()) { 1564 if (it.GetMemberIndex() == method_idx) { 1565 return class_def_method_index; 1566 } 1567 class_def_method_index++; 1568 it.Next(); 1569 } 1570 while (it.HasNextVirtualMethod()) { 1571 if (it.GetMemberIndex() == method_idx) { 1572 return class_def_method_index; 1573 } 1574 class_def_method_index++; 1575 it.Next(); 1576 } 1577 DCHECK(!it.HasNext()); 1578 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1579 return 0; 1580} 1581 1582const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1583 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1584 // method for direct methods (or virtual methods made direct). 1585 mirror::Class* declaring_class = method->GetDeclaringClass(); 1586 size_t oat_method_index; 1587 if (method->IsStatic() || method->IsDirect()) { 1588 // Simple case where the oat method index was stashed at load time. 1589 oat_method_index = method->GetMethodIndex(); 1590 } else { 1591 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1592 // by search for its position in the declared virtual methods. 1593 oat_method_index = declaring_class->NumDirectMethods(); 1594 size_t end = declaring_class->NumVirtualMethods(); 1595 bool found = false; 1596 for (size_t i = 0; i < end; i++) { 1597 if (declaring_class->GetVirtualMethod(i) == method) { 1598 found = true; 1599 break; 1600 } 1601 oat_method_index++; 1602 } 1603 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1604 } 1605 UniquePtr<const OatFile::OatClass> 1606 oat_class(GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1607 declaring_class->GetDexClassDefIndex())); 1608 CHECK(oat_class.get() != NULL); 1609 DCHECK_EQ(oat_method_index, 1610 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1611 method->GetDeclaringClass()->GetDexClassDefIndex(), 1612 method->GetDexMethodIndex())); 1613 1614 return oat_class->GetOatMethod(oat_method_index); 1615} 1616 1617// Special case to get oat code without overwriting a trampoline. 1618const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1619 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1620 if (method->IsProxyMethod()) { 1621 return GetQuickProxyInvokeHandler(); 1622 } 1623 const void* result = GetOatMethodFor(method).GetQuickCode(); 1624 if (result == nullptr) { 1625 if (method->IsNative()) { 1626 // No code and native? Use generic trampoline. 1627 result = GetQuickGenericJniTrampoline(); 1628 } else if (method->IsPortableCompiled()) { 1629 // No code? Do we expect portable code? 1630 result = GetQuickToPortableBridge(); 1631 } else { 1632 // No code? You must mean to go into the interpreter. 1633 result = GetQuickToInterpreterBridge(); 1634 } 1635 } 1636 return result; 1637} 1638 1639const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1640 bool* have_portable_code) { 1641 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1642 *have_portable_code = false; 1643 if (method->IsProxyMethod()) { 1644 return GetPortableProxyInvokeHandler(); 1645 } 1646 const void* result = GetOatMethodFor(method).GetPortableCode(); 1647 if (result == nullptr) { 1648 if (GetOatMethodFor(method).GetQuickCode() == nullptr) { 1649 // No code? You must mean to go into the interpreter. 1650 result = GetPortableToInterpreterBridge(); 1651 } else { 1652 // No code? But there's quick code, so use a bridge. 1653 result = GetPortableToQuickBridge(); 1654 } 1655 } else { 1656 *have_portable_code = true; 1657 } 1658 return result; 1659} 1660 1661const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1662 uint32_t method_idx) { 1663 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1664 CHECK(oat_class.get() != nullptr); 1665 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1666 return oat_class->GetOatMethod(oat_method_idx).GetQuickCode(); 1667} 1668 1669const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1670 uint32_t method_idx) { 1671 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx)); 1672 CHECK(oat_class.get() != nullptr); 1673 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1674 return oat_class->GetOatMethod(oat_method_idx).GetPortableCode(); 1675} 1676 1677// Returns true if the method must run with interpreter, false otherwise. 1678static bool NeedsInterpreter(mirror::ArtMethod* method, const void* quick_code, 1679 const void* portable_code) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1680 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1681 // No code: need interpreter. 1682 // May return true for native code, in the case of generic JNI 1683 // DCHECK(!method->IsNative()); 1684 return true; 1685 } 1686#ifdef ART_SEA_IR_MODE 1687 ScopedObjectAccess soa(Thread::Current()); 1688 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1689 LOG(INFO) << "Found " << PrettyMethod(method); 1690 return false; 1691 } 1692#endif 1693 // If interpreter mode is enabled, every method (except native and proxy) must 1694 // be run with interpreter. 1695 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1696 !method->IsNative() && !method->IsProxyMethod(); 1697} 1698 1699void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1700 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1701 if (klass->NumDirectMethods() == 0) { 1702 return; // No direct methods => no static methods. 1703 } 1704 Runtime* runtime = Runtime::Current(); 1705 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1706 return; // OAT file unavailable. 1707 } 1708 ClassHelper kh(klass); 1709 const DexFile& dex_file = kh.GetDexFile(); 1710 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 1711 CHECK(dex_class_def != nullptr); 1712 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1713 // There should always be class data if there were direct methods. 1714 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1715 UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1716 CHECK(oat_class.get() != nullptr); 1717 ClassDataItemIterator it(dex_file, class_data); 1718 // Skip fields 1719 while (it.HasNextStaticField()) { 1720 it.Next(); 1721 } 1722 while (it.HasNextInstanceField()) { 1723 it.Next(); 1724 } 1725 // Link the code of methods skipped by LinkCode. 1726 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1727 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1728 if (!method->IsStatic()) { 1729 // Only update static methods. 1730 continue; 1731 } 1732 const void* portable_code = oat_class->GetOatMethod(method_index).GetPortableCode(); 1733 const void* quick_code = oat_class->GetOatMethod(method_index).GetQuickCode(); 1734 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1735 bool have_portable_code = false; 1736 if (enter_interpreter) { 1737 // Use interpreter entry point. 1738 // Check whether the method is native, in which case it's generic JNI. 1739 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 1740 quick_code = GetQuickGenericJniTrampoline(); 1741 portable_code = GetPortableToQuickBridge(); 1742 } else { 1743 portable_code = GetPortableToInterpreterBridge(); 1744 quick_code = GetQuickToInterpreterBridge(); 1745 } 1746 } else { 1747 if (portable_code == nullptr) { 1748 portable_code = GetPortableToQuickBridge(); 1749 } else { 1750 have_portable_code = true; 1751 } 1752 if (quick_code == nullptr) { 1753 quick_code = GetQuickToPortableBridge(); 1754 } 1755 } 1756 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1757 have_portable_code); 1758 } 1759 // Ignore virtual methods on the iterator. 1760} 1761 1762static void LinkCode(const SirtRef<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class, 1763 const DexFile& dex_file, uint32_t dex_method_index, uint32_t method_index) 1764 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1765 // Method shouldn't have already been linked. 1766 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1767 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1768 // Every kind of method should at least get an invoke stub from the oat_method. 1769 // non-abstract methods also get their code pointers. 1770 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1771 oat_method.LinkMethod(method.get()); 1772 1773 // Install entry point from interpreter. 1774 Runtime* runtime = Runtime::Current(); 1775 bool enter_interpreter = NeedsInterpreter(method.get(), 1776 method->GetEntryPointFromQuickCompiledCode(), 1777 method->GetEntryPointFromPortableCompiledCode()); 1778 if (enter_interpreter && !method->IsNative()) { 1779 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1780 } else { 1781 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1782 } 1783 1784 if (method->IsAbstract()) { 1785 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1786 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1787 return; 1788 } 1789 1790 bool have_portable_code = false; 1791 if (method->IsStatic() && !method->IsConstructor()) { 1792 // For static methods excluding the class initializer, install the trampoline. 1793 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1794 // after initializing class (see ClassLinker::InitializeClass method). 1795 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline(runtime->GetClassLinker())); 1796 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline(runtime->GetClassLinker())); 1797 } else if (enter_interpreter) { 1798 if (!method->IsNative()) { 1799 // Set entry point from compiled code if there's no code or in interpreter only mode. 1800 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1801 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1802 } else { 1803 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 1804 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1805 } 1806 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1807 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1808 have_portable_code = true; 1809 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1810 } else { 1811 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1812 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1813 } 1814 1815 if (method->IsNative()) { 1816 // Unregistering restores the dlsym lookup stub. 1817 method->UnregisterNative(Thread::Current()); 1818 1819 if (enter_interpreter) { 1820 // We have a native method here without code. Then it should have either the GenericJni 1821 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 1822 DCHECK(method->GetEntryPointFromQuickCompiledCode() == 1823 GetQuickResolutionTrampoline(runtime->GetClassLinker()) 1824 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 1825 1826 DCHECK_EQ(method->GetFrameSizeInBytes<false>(), 0U); 1827 1828 // Fix up method metadata if necessary. 1829 uint32_t s_len; 1830 const char* shorty = dex_file.GetMethodShorty(dex_file.GetMethodId(dex_method_index), &s_len); 1831 uint32_t refs = 1; // Native method always has "this" or class. 1832 for (uint32_t i = 1; i < s_len; ++i) { 1833 if (shorty[i] == 'L') { 1834 refs++; 1835 } 1836 } 1837 size_t sirt_size = StackIndirectReferenceTable::GetAlignedSirtSize(refs); 1838 1839 // Get the generic spill masks and base frame size. 1840 mirror::ArtMethod* callee_save_method = 1841 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 1842 1843 method->SetFrameSizeInBytes(callee_save_method->GetFrameSizeInBytes() + sirt_size); 1844 method->SetCoreSpillMask(callee_save_method->GetCoreSpillMask()); 1845 method->SetFpSpillMask(callee_save_method->GetFpSpillMask()); 1846 } 1847 } 1848 1849 // Allow instrumentation its chance to hijack code. 1850 runtime->GetInstrumentation()->UpdateMethodsCode(method.get(), 1851 method->GetEntryPointFromQuickCompiledCode(), 1852 method->GetEntryPointFromPortableCompiledCode(), 1853 have_portable_code); 1854} 1855 1856void ClassLinker::LoadClass(const DexFile& dex_file, 1857 const DexFile::ClassDef& dex_class_def, 1858 const SirtRef<mirror::Class>& klass, 1859 mirror::ClassLoader* class_loader) { 1860 CHECK(klass.get() != NULL); 1861 CHECK(klass->GetDexCache() != NULL); 1862 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1863 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1864 CHECK(descriptor != NULL); 1865 1866 klass->SetClass(GetClassRoot(kJavaLangClass)); 1867 if (kUseBrooksPointer) { 1868 klass->AssertSelfBrooksPointer(); 1869 } 1870 uint32_t access_flags = dex_class_def.access_flags_; 1871 // Make sure that none of our runtime-only flags are set. 1872 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 1873 klass->SetAccessFlags(access_flags); 1874 klass->SetClassLoader(class_loader); 1875 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 1876 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 1877 1878 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 1879 klass->SetDexTypeIndex(dex_class_def.class_idx_); 1880 1881 // Load fields fields. 1882 const byte* class_data = dex_file.GetClassData(dex_class_def); 1883 if (class_data == NULL) { 1884 return; // no fields or methods - for example a marker interface 1885 } 1886 ClassDataItemIterator it(dex_file, class_data); 1887 Thread* self = Thread::Current(); 1888 if (it.NumStaticFields() != 0) { 1889 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 1890 if (UNLIKELY(statics == NULL)) { 1891 CHECK(self->IsExceptionPending()); // OOME. 1892 return; 1893 } 1894 klass->SetSFields(statics); 1895 } 1896 if (it.NumInstanceFields() != 0) { 1897 mirror::ObjectArray<mirror::ArtField>* fields = 1898 AllocArtFieldArray(self, it.NumInstanceFields()); 1899 if (UNLIKELY(fields == NULL)) { 1900 CHECK(self->IsExceptionPending()); // OOME. 1901 return; 1902 } 1903 klass->SetIFields(fields); 1904 } 1905 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 1906 SirtRef<mirror::ArtField> sfield(self, AllocArtField(self)); 1907 if (UNLIKELY(sfield.get() == NULL)) { 1908 CHECK(self->IsExceptionPending()); // OOME. 1909 return; 1910 } 1911 klass->SetStaticField(i, sfield.get()); 1912 LoadField(dex_file, it, klass, sfield); 1913 } 1914 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 1915 SirtRef<mirror::ArtField> ifield(self, AllocArtField(self)); 1916 if (UNLIKELY(ifield.get() == NULL)) { 1917 CHECK(self->IsExceptionPending()); // OOME. 1918 return; 1919 } 1920 klass->SetInstanceField(i, ifield.get()); 1921 LoadField(dex_file, it, klass, ifield); 1922 } 1923 1924 UniquePtr<const OatFile::OatClass> oat_class; 1925 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 1926 oat_class.reset(GetOatClass(dex_file, klass->GetDexClassDefIndex())); 1927 } 1928 1929 // Load methods. 1930 if (it.NumDirectMethods() != 0) { 1931 // TODO: append direct methods to class object 1932 mirror::ObjectArray<mirror::ArtMethod>* directs = 1933 AllocArtMethodArray(self, it.NumDirectMethods()); 1934 if (UNLIKELY(directs == NULL)) { 1935 CHECK(self->IsExceptionPending()); // OOME. 1936 return; 1937 } 1938 klass->SetDirectMethods(directs); 1939 } 1940 if (it.NumVirtualMethods() != 0) { 1941 // TODO: append direct methods to class object 1942 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 1943 AllocArtMethodArray(self, it.NumVirtualMethods()); 1944 if (UNLIKELY(virtuals == NULL)) { 1945 CHECK(self->IsExceptionPending()); // OOME. 1946 return; 1947 } 1948 klass->SetVirtualMethods(virtuals); 1949 } 1950 size_t class_def_method_index = 0; 1951 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 1952 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1953 if (UNLIKELY(method.get() == NULL)) { 1954 CHECK(self->IsExceptionPending()); // OOME. 1955 return; 1956 } 1957 klass->SetDirectMethod(i, method.get()); 1958 if (oat_class.get() != NULL) { 1959 LinkCode(method, oat_class.get(), dex_file, it.GetMemberIndex(), class_def_method_index); 1960 } 1961 method->SetMethodIndex(class_def_method_index); 1962 class_def_method_index++; 1963 } 1964 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 1965 SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass)); 1966 if (UNLIKELY(method.get() == NULL)) { 1967 CHECK(self->IsExceptionPending()); // OOME. 1968 return; 1969 } 1970 klass->SetVirtualMethod(i, method.get()); 1971 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 1972 if (oat_class.get() != NULL) { 1973 LinkCode(method, oat_class.get(), dex_file, it.GetMemberIndex(), class_def_method_index); 1974 } 1975 class_def_method_index++; 1976 } 1977 DCHECK(!it.HasNext()); 1978} 1979 1980void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 1981 const SirtRef<mirror::Class>& klass, 1982 const SirtRef<mirror::ArtField>& dst) { 1983 uint32_t field_idx = it.GetMemberIndex(); 1984 dst->SetDexFieldIndex(field_idx); 1985 dst->SetDeclaringClass(klass.get()); 1986 dst->SetAccessFlags(it.GetMemberAccessFlags()); 1987} 1988 1989mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 1990 const ClassDataItemIterator& it, 1991 const SirtRef<mirror::Class>& klass) { 1992 uint32_t dex_method_idx = it.GetMemberIndex(); 1993 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 1994 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 1995 1996 mirror::ArtMethod* dst = AllocArtMethod(self); 1997 if (UNLIKELY(dst == NULL)) { 1998 CHECK(self->IsExceptionPending()); // OOME. 1999 return NULL; 2000 } 2001 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2002 2003 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2004 dst->SetDexMethodIndex(dex_method_idx); 2005 dst->SetDeclaringClass(klass.get()); 2006 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2007 2008 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2009 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2010 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2011 2012 uint32_t access_flags = it.GetMemberAccessFlags(); 2013 2014 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2015 // Set finalizable flag on declaring class. 2016 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2017 // Void return type. 2018 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 2019 klass->SetFinalizable(); 2020 } else { 2021 ClassHelper kh(klass.get()); 2022 const char* klass_descriptor = kh.GetDescriptor(); 2023 // The Enum class declares a "final" finalize() method to prevent subclasses from 2024 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2025 // subclasses, so we exclude it here. 2026 // We also want to avoid setting the flag on Object, where we know that finalize() is 2027 // empty. 2028 if ((strcmp("Ljava/lang/Object;", klass_descriptor) != 0) && 2029 (strcmp("Ljava/lang/Enum;", klass_descriptor) != 0)) { 2030 klass->SetFinalizable(); 2031 } 2032 } 2033 } 2034 } else if (method_name[0] == '<') { 2035 // Fix broken access flags for initializers. Bug 11157540. 2036 bool is_init = (strcmp("<init>", method_name) == 0); 2037 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2038 if (UNLIKELY(!is_init && !is_clinit)) { 2039 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2040 } else { 2041 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2042 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2043 << PrettyDescriptor(klass.get()) << " in dex file " << dex_file.GetLocation(); 2044 access_flags |= kAccConstructor; 2045 } 2046 } 2047 } 2048 dst->SetAccessFlags(access_flags); 2049 2050 self->EndAssertNoThreadSuspension(old_cause); 2051 return dst; 2052} 2053 2054void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2055 Thread* self = Thread::Current(); 2056 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 2057 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2058 AppendToBootClassPath(dex_file, dex_cache); 2059} 2060 2061void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2062 const SirtRef<mirror::DexCache>& dex_cache) { 2063 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 2064 boot_class_path_.push_back(&dex_file); 2065 RegisterDexFile(dex_file, dex_cache); 2066} 2067 2068bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const { 2069 dex_lock_.AssertSharedHeld(Thread::Current()); 2070 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2071 if (dex_caches_[i]->GetDexFile() == &dex_file) { 2072 return true; 2073 } 2074 } 2075 return false; 2076} 2077 2078bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const { 2079 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2080 return IsDexFileRegisteredLocked(dex_file); 2081} 2082 2083void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2084 const SirtRef<mirror::DexCache>& dex_cache) { 2085 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2086 CHECK(dex_cache.get() != NULL) << dex_file.GetLocation(); 2087 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2088 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2089 dex_caches_.push_back(dex_cache.get()); 2090 dex_cache->SetDexFile(&dex_file); 2091 if (log_new_dex_caches_roots_) { 2092 // TODO: This is not safe if we can remove dex caches. 2093 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2094 } 2095} 2096 2097void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2098 Thread* self = Thread::Current(); 2099 { 2100 ReaderMutexLock mu(self, dex_lock_); 2101 if (IsDexFileRegisteredLocked(dex_file)) { 2102 return; 2103 } 2104 } 2105 // Don't alloc while holding the lock, since allocation may need to 2106 // suspend all threads and another thread may need the dex_lock_ to 2107 // get to a suspend point. 2108 SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file)); 2109 CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2110 { 2111 WriterMutexLock mu(self, dex_lock_); 2112 if (IsDexFileRegisteredLocked(dex_file)) { 2113 return; 2114 } 2115 RegisterDexFileLocked(dex_file, dex_cache); 2116 } 2117} 2118 2119void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2120 const SirtRef<mirror::DexCache>& dex_cache) { 2121 WriterMutexLock mu(Thread::Current(), dex_lock_); 2122 RegisterDexFileLocked(dex_file, dex_cache); 2123} 2124 2125mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const { 2126 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2127 // Search assuming unique-ness of dex file. 2128 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2129 mirror::DexCache* dex_cache = dex_caches_[i]; 2130 if (dex_cache->GetDexFile() == &dex_file) { 2131 return dex_cache; 2132 } 2133 } 2134 // Search matching by location name. 2135 std::string location(dex_file.GetLocation()); 2136 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2137 mirror::DexCache* dex_cache = dex_caches_[i]; 2138 if (dex_cache->GetDexFile()->GetLocation() == location) { 2139 return dex_cache; 2140 } 2141 } 2142 // Failure, dump diagnostic and abort. 2143 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2144 mirror::DexCache* dex_cache = dex_caches_[i]; 2145 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2146 } 2147 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2148 return NULL; 2149} 2150 2151void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const { 2152 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2153 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2154 dex_caches_[i]->Fixup(resolution_method); 2155 } 2156} 2157 2158mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2159 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2160 if (UNLIKELY(klass == NULL)) { 2161 return NULL; 2162 } 2163 return InitializePrimitiveClass(klass, type); 2164} 2165 2166mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2167 Primitive::Type type) { 2168 CHECK(primitive_class != NULL); 2169 // Must hold lock on object when initializing. 2170 Thread* self = Thread::Current(); 2171 SirtRef<mirror::Class> sirt_class(self, primitive_class); 2172 ObjectLock<mirror::Class> lock(self, &sirt_class); 2173 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2174 primitive_class->SetPrimitiveType(type); 2175 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2176 const char* descriptor = Primitive::Descriptor(type); 2177 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2178 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2179 return primitive_class; 2180} 2181 2182// Create an array class (i.e. the class object for the array, not the 2183// array itself). "descriptor" looks like "[C" or "[[[[B" or 2184// "[Ljava/lang/String;". 2185// 2186// If "descriptor" refers to an array of primitives, look up the 2187// primitive type's internally-generated class object. 2188// 2189// "class_loader" is the class loader of the class that's referring to 2190// us. It's used to ensure that we're looking for the element type in 2191// the right context. It does NOT become the class loader for the 2192// array class; that always comes from the base element class. 2193// 2194// Returns NULL with an exception raised on failure. 2195mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2196 const SirtRef<mirror::ClassLoader>& class_loader) { 2197 // Identify the underlying component type 2198 CHECK_EQ('[', descriptor[0]); 2199 SirtRef<mirror::Class> component_type(self, FindClass(self, descriptor + 1, class_loader)); 2200 if (component_type.get() == nullptr) { 2201 DCHECK(self->IsExceptionPending()); 2202 return nullptr; 2203 } 2204 2205 // See if the component type is already loaded. Array classes are 2206 // always associated with the class loader of their underlying 2207 // element type -- an array of Strings goes with the loader for 2208 // java/lang/String -- so we need to look for it there. (The 2209 // caller should have checked for the existence of the class 2210 // before calling here, but they did so with *their* class loader, 2211 // not the component type's loader.) 2212 // 2213 // If we find it, the caller adds "loader" to the class' initiating 2214 // loader list, which should prevent us from going through this again. 2215 // 2216 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2217 // are the same, because our caller (FindClass) just did the 2218 // lookup. (Even if we get this wrong we still have correct behavior, 2219 // because we effectively do this lookup again when we add the new 2220 // class to the hash table --- necessary because of possible races with 2221 // other threads.) 2222 if (class_loader.get() != component_type->GetClassLoader()) { 2223 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2224 if (new_class != NULL) { 2225 return new_class; 2226 } 2227 } 2228 2229 // Fill out the fields in the Class. 2230 // 2231 // It is possible to execute some methods against arrays, because 2232 // all arrays are subclasses of java_lang_Object_, so we need to set 2233 // up a vtable. We can just point at the one in java_lang_Object_. 2234 // 2235 // Array classes are simple enough that we don't need to do a full 2236 // link step. 2237 SirtRef<mirror::Class> new_class(self, NULL); 2238 if (UNLIKELY(!init_done_)) { 2239 // Classes that were hand created, ie not by FindSystemClass 2240 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2241 new_class.reset(GetClassRoot(kClassArrayClass)); 2242 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2243 new_class.reset(GetClassRoot(kObjectArrayClass)); 2244 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2245 new_class.reset(GetClassRoot(kJavaLangStringArrayClass)); 2246 } else if (strcmp(descriptor, 2247 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2248 new_class.reset(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2249 } else if (strcmp(descriptor, 2250 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2251 new_class.reset(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2252 } else if (strcmp(descriptor, "[C") == 0) { 2253 new_class.reset(GetClassRoot(kCharArrayClass)); 2254 } else if (strcmp(descriptor, "[I") == 0) { 2255 new_class.reset(GetClassRoot(kIntArrayClass)); 2256 } 2257 } 2258 if (new_class.get() == nullptr) { 2259 new_class.reset(AllocClass(self, sizeof(mirror::Class))); 2260 if (new_class.get() == nullptr) { 2261 return nullptr; 2262 } 2263 new_class->SetComponentType(component_type.get()); 2264 } 2265 ObjectLock<mirror::Class> lock(self, &new_class); // Must hold lock on object when initializing. 2266 DCHECK(new_class->GetComponentType() != NULL); 2267 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2268 new_class->SetSuperClass(java_lang_Object); 2269 new_class->SetVTable(java_lang_Object->GetVTable()); 2270 new_class->SetPrimitiveType(Primitive::kPrimNot); 2271 new_class->SetClassLoader(component_type->GetClassLoader()); 2272 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2273 // don't need to set new_class->SetObjectSize(..) 2274 // because Object::SizeOf delegates to Array::SizeOf 2275 2276 2277 // All arrays have java/lang/Cloneable and java/io/Serializable as 2278 // interfaces. We need to set that up here, so that stuff like 2279 // "instanceof" works right. 2280 // 2281 // Note: The GC could run during the call to FindSystemClass, 2282 // so we need to make sure the class object is GC-valid while we're in 2283 // there. Do this by clearing the interface list so the GC will just 2284 // think that the entries are null. 2285 2286 2287 // Use the single, global copies of "interfaces" and "iftable" 2288 // (remember not to free them for arrays). 2289 CHECK(array_iftable_ != nullptr); 2290 new_class->SetIfTable(array_iftable_); 2291 2292 // Inherit access flags from the component type. 2293 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2294 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2295 access_flags &= kAccJavaFlagsMask; 2296 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2297 // and remove "interface". 2298 access_flags |= kAccAbstract | kAccFinal; 2299 access_flags &= ~kAccInterface; 2300 2301 new_class->SetAccessFlags(access_flags); 2302 2303 mirror::Class* existing = InsertClass(descriptor, new_class.get(), Hash(descriptor)); 2304 if (existing == nullptr) { 2305 return new_class.get(); 2306 } 2307 // Another thread must have loaded the class after we 2308 // started but before we finished. Abandon what we've 2309 // done. 2310 // 2311 // (Yes, this happens.) 2312 2313 return existing; 2314} 2315 2316mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2317 switch (type) { 2318 case 'B': 2319 return GetClassRoot(kPrimitiveByte); 2320 case 'C': 2321 return GetClassRoot(kPrimitiveChar); 2322 case 'D': 2323 return GetClassRoot(kPrimitiveDouble); 2324 case 'F': 2325 return GetClassRoot(kPrimitiveFloat); 2326 case 'I': 2327 return GetClassRoot(kPrimitiveInt); 2328 case 'J': 2329 return GetClassRoot(kPrimitiveLong); 2330 case 'S': 2331 return GetClassRoot(kPrimitiveShort); 2332 case 'Z': 2333 return GetClassRoot(kPrimitiveBoolean); 2334 case 'V': 2335 return GetClassRoot(kPrimitiveVoid); 2336 default: 2337 break; 2338 } 2339 std::string printable_type(PrintableChar(type)); 2340 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2341 return NULL; 2342} 2343 2344mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2345 size_t hash) { 2346 if (VLOG_IS_ON(class_linker)) { 2347 mirror::DexCache* dex_cache = klass->GetDexCache(); 2348 std::string source; 2349 if (dex_cache != NULL) { 2350 source += " from "; 2351 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2352 } 2353 LOG(INFO) << "Loaded class " << descriptor << source; 2354 } 2355 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2356 mirror::Class* existing = 2357 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2358 if (existing != NULL) { 2359 return existing; 2360 } 2361 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2362 // Check a class loaded with the system class loader matches one in the image if the class 2363 // is in the image. 2364 existing = LookupClassFromImage(descriptor); 2365 if (existing != NULL) { 2366 CHECK(klass == existing); 2367 } 2368 } 2369 VerifyObject(klass); 2370 class_table_.insert(std::make_pair(hash, klass)); 2371 if (log_new_class_table_roots_) { 2372 new_class_roots_.push_back(std::make_pair(hash, klass)); 2373 } 2374 return NULL; 2375} 2376 2377bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2378 size_t hash = Hash(descriptor); 2379 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2380 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2381 ++it) { 2382 mirror::Class* klass = it->second; 2383 ClassHelper kh(klass); 2384 if ((klass->GetClassLoader() == class_loader) && 2385 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2386 class_table_.erase(it); 2387 return true; 2388 } 2389 } 2390 return false; 2391} 2392 2393mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2394 const mirror::ClassLoader* class_loader) { 2395 size_t hash = Hash(descriptor); 2396 { 2397 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2398 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2399 if (result != NULL) { 2400 return result; 2401 } 2402 } 2403 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2404 return NULL; 2405 } else { 2406 // Lookup failed but need to search dex_caches_. 2407 mirror::Class* result = LookupClassFromImage(descriptor); 2408 if (result != NULL) { 2409 InsertClass(descriptor, result, hash); 2410 } else { 2411 // Searching the image dex files/caches failed, we don't want to get into this situation 2412 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2413 // classes into the class table. 2414 const int32_t kMaxFailedDexCacheLookups = 1000; 2415 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2416 MoveImageClassesToClassTable(); 2417 } 2418 } 2419 return result; 2420 } 2421} 2422 2423mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2424 const mirror::ClassLoader* class_loader, 2425 size_t hash) { 2426 auto end = class_table_.end(); 2427 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2428 mirror::Class* klass = it->second; 2429 ClassHelper kh(klass); 2430 if ((klass->GetClassLoader() == class_loader) && 2431 (strcmp(descriptor, kh.GetDescriptor()) == 0)) { 2432 if (kIsDebugBuild) { 2433 // Check for duplicates in the table. 2434 for (++it; it != end && it->first == hash; ++it) { 2435 mirror::Class* klass2 = it->second; 2436 ClassHelper kh(klass2); 2437 CHECK(!((klass2->GetClassLoader() == class_loader) && 2438 (strcmp(descriptor, kh.GetDescriptor()) == 0))) 2439 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2440 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2441 } 2442 } 2443 return klass; 2444 } 2445 } 2446 return NULL; 2447} 2448 2449static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2450 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2451 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2452 CHECK(image != NULL); 2453 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2454 return root->AsObjectArray<mirror::DexCache>(); 2455} 2456 2457void ClassLinker::MoveImageClassesToClassTable() { 2458 Thread* self = Thread::Current(); 2459 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2460 if (!dex_cache_image_class_lookup_required_) { 2461 return; // All dex cache classes are already in the class table. 2462 } 2463 const char* old_no_suspend_cause = 2464 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2465 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2466 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2467 mirror::DexCache* dex_cache = dex_caches->Get(i); 2468 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2469 for (int32_t j = 0; j < types->GetLength(); j++) { 2470 mirror::Class* klass = types->Get(j); 2471 if (klass != NULL) { 2472 ClassHelper kh(klass); 2473 DCHECK(klass->GetClassLoader() == NULL); 2474 const char* descriptor = kh.GetDescriptor(); 2475 size_t hash = Hash(descriptor); 2476 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 2477 if (existing != NULL) { 2478 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2479 << PrettyClassAndClassLoader(klass); 2480 } else { 2481 class_table_.insert(std::make_pair(hash, klass)); 2482 if (log_new_class_table_roots_) { 2483 new_class_roots_.push_back(std::make_pair(hash, klass)); 2484 } 2485 } 2486 } 2487 } 2488 } 2489 dex_cache_image_class_lookup_required_ = false; 2490 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2491} 2492 2493mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2494 Thread* self = Thread::Current(); 2495 const char* old_no_suspend_cause = 2496 self->StartAssertNoThreadSuspension("Image class lookup"); 2497 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2498 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2499 mirror::DexCache* dex_cache = dex_caches->Get(i); 2500 const DexFile* dex_file = dex_cache->GetDexFile(); 2501 // Try binary searching the string/type index. 2502 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2503 if (string_id != NULL) { 2504 const DexFile::TypeId* type_id = 2505 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2506 if (type_id != NULL) { 2507 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2508 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2509 if (klass != NULL) { 2510 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2511 return klass; 2512 } 2513 } 2514 } 2515 } 2516 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2517 return NULL; 2518} 2519 2520void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2521 result.clear(); 2522 if (dex_cache_image_class_lookup_required_) { 2523 MoveImageClassesToClassTable(); 2524 } 2525 size_t hash = Hash(descriptor); 2526 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2527 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2528 it != end && it->first == hash; ++it) { 2529 mirror::Class* klass = it->second; 2530 ClassHelper kh(klass); 2531 if (strcmp(descriptor, kh.GetDescriptor()) == 0) { 2532 result.push_back(klass); 2533 } 2534 } 2535} 2536 2537void ClassLinker::VerifyClass(const SirtRef<mirror::Class>& klass) { 2538 // TODO: assert that the monitor on the Class is held 2539 Thread* self = Thread::Current(); 2540 ObjectLock<mirror::Class> lock(self, &klass); 2541 2542 // Don't attempt to re-verify if already sufficiently verified. 2543 if (klass->IsVerified() || 2544 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2545 return; 2546 } 2547 2548 // The class might already be erroneous, for example at compile time if we attempted to verify 2549 // this class as a parent to another. 2550 if (klass->IsErroneous()) { 2551 ThrowEarlierClassFailure(klass.get()); 2552 return; 2553 } 2554 2555 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2556 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2557 } else { 2558 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2559 << PrettyClass(klass.get()); 2560 CHECK(!Runtime::Current()->IsCompiler()); 2561 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2562 } 2563 2564 // Verify super class. 2565 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 2566 if (super.get() != NULL) { 2567 // Acquire lock to prevent races on verifying the super class. 2568 ObjectLock<mirror::Class> lock(self, &super); 2569 2570 if (!super->IsVerified() && !super->IsErroneous()) { 2571 VerifyClass(super); 2572 } 2573 if (!super->IsCompileTimeVerified()) { 2574 std::string error_msg(StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2575 PrettyDescriptor(klass.get()).c_str(), 2576 PrettyDescriptor(super.get()).c_str())); 2577 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2578 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 2579 if (cause.get() != nullptr) { 2580 self->ClearException(); 2581 } 2582 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2583 if (cause.get() != nullptr) { 2584 self->GetException(nullptr)->SetCause(cause.get()); 2585 } 2586 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2587 if (Runtime::Current()->IsCompiler()) { 2588 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2589 } 2590 klass->SetStatus(mirror::Class::kStatusError, self); 2591 return; 2592 } 2593 } 2594 2595 // Try to use verification information from the oat file, otherwise do runtime verification. 2596 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2597 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2598 bool preverified = VerifyClassUsingOatFile(dex_file, klass.get(), oat_file_class_status); 2599 if (oat_file_class_status == mirror::Class::kStatusError) { 2600 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2601 << PrettyDescriptor(klass.get()) << " in " 2602 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2603 ThrowVerifyError(klass.get(), "Rejecting class %s because it failed compile-time verification", 2604 PrettyDescriptor(klass.get()).c_str()); 2605 klass->SetStatus(mirror::Class::kStatusError, self); 2606 return; 2607 } 2608 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2609 std::string error_msg; 2610 if (!preverified) { 2611 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.get(), 2612 Runtime::Current()->IsCompiler(), 2613 &error_msg); 2614 } 2615 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2616 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2617 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.get()) 2618 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2619 << " because: " << error_msg; 2620 } 2621 self->AssertNoPendingException(); 2622 // Make sure all classes referenced by catch blocks are resolved. 2623 ResolveClassExceptionHandlerTypes(dex_file, klass); 2624 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2625 // Even though there were no verifier failures we need to respect whether the super-class 2626 // was verified or requiring runtime reverification. 2627 if (super.get() == NULL || super->IsVerified()) { 2628 klass->SetStatus(mirror::Class::kStatusVerified, self); 2629 } else { 2630 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2631 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2632 // Pretend a soft failure occured so that we don't consider the class verified below. 2633 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2634 } 2635 } else { 2636 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2637 // Soft failures at compile time should be retried at runtime. Soft 2638 // failures at runtime will be handled by slow paths in the generated 2639 // code. Set status accordingly. 2640 if (Runtime::Current()->IsCompiler()) { 2641 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2642 } else { 2643 klass->SetStatus(mirror::Class::kStatusVerified, self); 2644 } 2645 } 2646 } else { 2647 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.get()) 2648 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2649 << " because: " << error_msg; 2650 self->AssertNoPendingException(); 2651 ThrowVerifyError(klass.get(), "%s", error_msg.c_str()); 2652 klass->SetStatus(mirror::Class::kStatusError, self); 2653 } 2654 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2655 // Class is verified so we don't need to do any access check on its methods. 2656 // Let the interpreter know it by setting the kAccPreverified flag onto each 2657 // method. 2658 // Note: we're going here during compilation and at runtime. When we set the 2659 // kAccPreverified flag when compiling image classes, the flag is recorded 2660 // in the image and is set when loading the image. 2661 klass->SetPreverifiedFlagOnAllMethods(); 2662 } 2663} 2664 2665bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2666 mirror::Class::Status& oat_file_class_status) { 2667 // If we're compiling, we can only verify the class using the oat file if 2668 // we are not compiling the image or if the class we're verifying is not part of 2669 // the app. In other words, we will only check for preverification of bootclasspath 2670 // classes. 2671 if (Runtime::Current()->IsCompiler()) { 2672 // Are we compiling the bootclasspath? 2673 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2674 return false; 2675 } 2676 // We are compiling an app (not the image). 2677 2678 // Is this an app class? (I.e. not a bootclasspath class) 2679 if (klass->GetClassLoader() != NULL) { 2680 return false; 2681 } 2682 } 2683 2684 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2685 // Make this work with gtests, which do not set up the image properly. 2686 // TODO: we should clean up gtests to set up the image path properly. 2687 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2688 return false; 2689 } 2690 2691 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2692 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2693 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2694 &dex_location_checksum); 2695 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2696 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2697 UniquePtr<const OatFile::OatClass> oat_class(oat_dex_file->GetOatClass(class_def_index)); 2698 CHECK(oat_class.get() != NULL) 2699 << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2700 << ClassHelper(klass).GetDescriptor(); 2701 oat_file_class_status = oat_class->GetStatus(); 2702 if (oat_file_class_status == mirror::Class::kStatusVerified || 2703 oat_file_class_status == mirror::Class::kStatusInitialized) { 2704 return true; 2705 } 2706 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2707 // Compile time verification failed with a soft error. Compile time verification can fail 2708 // because we have incomplete type information. Consider the following: 2709 // class ... { 2710 // Foo x; 2711 // .... () { 2712 // if (...) { 2713 // v1 gets assigned a type of resolved class Foo 2714 // } else { 2715 // v1 gets assigned a type of unresolved class Bar 2716 // } 2717 // iput x = v1 2718 // } } 2719 // when we merge v1 following the if-the-else it results in Conflict 2720 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2721 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2722 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2723 // at compile time). 2724 return false; 2725 } 2726 if (oat_file_class_status == mirror::Class::kStatusError) { 2727 // Compile time verification failed with a hard error. This is caused by invalid instructions 2728 // in the class. These errors are unrecoverable. 2729 return false; 2730 } 2731 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2732 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2733 // not loading the class. 2734 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2735 // isn't a problem and this case shouldn't occur 2736 return false; 2737 } 2738 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2739 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2740 << ClassHelper(klass).GetDescriptor(); 2741 2742 return false; 2743} 2744 2745void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2746 const SirtRef<mirror::Class>& klass) { 2747 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2748 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2749 } 2750 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2751 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2752 } 2753} 2754 2755void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2756 mirror::ArtMethod* method) { 2757 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2758 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2759 if (code_item == NULL) { 2760 return; // native or abstract method 2761 } 2762 if (code_item->tries_size_ == 0) { 2763 return; // nothing to process 2764 } 2765 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2766 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2767 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2768 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2769 CatchHandlerIterator iterator(handlers_ptr); 2770 for (; iterator.HasNext(); iterator.Next()) { 2771 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2772 // unresolved exception types will be ignored by exception delivery 2773 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2774 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2775 if (exception_type == NULL) { 2776 DCHECK(Thread::Current()->IsExceptionPending()); 2777 Thread::Current()->ClearException(); 2778 } 2779 } 2780 } 2781 handlers_ptr = iterator.EndDataPointer(); 2782 } 2783} 2784 2785static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2786static void CheckProxyMethod(mirror::ArtMethod* method, 2787 SirtRef<mirror::ArtMethod>& prototype); 2788 2789mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccess& soa, jstring name, 2790 jobjectArray interfaces, jobject loader, 2791 jobjectArray methods, jobjectArray throws) { 2792 Thread* self = soa.Self(); 2793 SirtRef<mirror::Class> klass(self, AllocClass(self, GetClassRoot(kJavaLangClass), 2794 sizeof(mirror::SynthesizedProxyClass))); 2795 if (klass.get() == NULL) { 2796 CHECK(self->IsExceptionPending()); // OOME. 2797 return NULL; 2798 } 2799 DCHECK(klass->GetClass() != NULL); 2800 klass->SetObjectSize(sizeof(mirror::Proxy)); 2801 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2802 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2803 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2804 klass->SetName(soa.Decode<mirror::String*>(name)); 2805 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2806 klass->SetDexCache(proxy_class->GetDexCache()); 2807 klass->SetStatus(mirror::Class::kStatusIdx, self); 2808 2809 // Instance fields are inherited, but we add a couple of static fields... 2810 { 2811 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2812 if (UNLIKELY(sfields == NULL)) { 2813 CHECK(self->IsExceptionPending()); // OOME. 2814 return NULL; 2815 } 2816 klass->SetSFields(sfields); 2817 } 2818 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2819 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2820 SirtRef<mirror::ArtField> interfaces_sfield(self, AllocArtField(self)); 2821 if (UNLIKELY(interfaces_sfield.get() == NULL)) { 2822 CHECK(self->IsExceptionPending()); // OOME. 2823 return NULL; 2824 } 2825 klass->SetStaticField(0, interfaces_sfield.get()); 2826 interfaces_sfield->SetDexFieldIndex(0); 2827 interfaces_sfield->SetDeclaringClass(klass.get()); 2828 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2829 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2830 SirtRef<mirror::ArtField> throws_sfield(self, AllocArtField(self)); 2831 if (UNLIKELY(throws_sfield.get() == NULL)) { 2832 CHECK(self->IsExceptionPending()); // OOME. 2833 return NULL; 2834 } 2835 klass->SetStaticField(1, throws_sfield.get()); 2836 throws_sfield->SetDexFieldIndex(1); 2837 throws_sfield->SetDeclaringClass(klass.get()); 2838 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2839 2840 // Proxies have 1 direct method, the constructor 2841 { 2842 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 2843 if (UNLIKELY(directs == NULL)) { 2844 CHECK(self->IsExceptionPending()); // OOME. 2845 return NULL; 2846 } 2847 klass->SetDirectMethods(directs); 2848 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 2849 if (UNLIKELY(constructor == NULL)) { 2850 CHECK(self->IsExceptionPending()); // OOME. 2851 return NULL; 2852 } 2853 klass->SetDirectMethod(0, constructor); 2854 } 2855 2856 // Create virtual method using specified prototypes. 2857 size_t num_virtual_methods = 2858 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 2859 { 2860 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, num_virtual_methods); 2861 if (UNLIKELY(virtuals == NULL)) { 2862 CHECK(self->IsExceptionPending()); // OOME. 2863 return NULL; 2864 } 2865 klass->SetVirtualMethods(virtuals); 2866 } 2867 for (size_t i = 0; i < num_virtual_methods; ++i) { 2868 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2869 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2870 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2871 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 2872 if (UNLIKELY(clone == NULL)) { 2873 CHECK(self->IsExceptionPending()); // OOME. 2874 return NULL; 2875 } 2876 klass->SetVirtualMethod(i, clone); 2877 } 2878 2879 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 2880 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Class is now effectively in the loaded state 2881 self->AssertNoPendingException(); 2882 2883 { 2884 ObjectLock<mirror::Class> lock(self, &klass); // Must hold lock on object when resolved. 2885 // Link the fields and virtual methods, creating vtable and iftables 2886 SirtRef<mirror::ObjectArray<mirror::Class> > sirt_interfaces( 2887 self, soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2888 if (!LinkClass(self, klass, sirt_interfaces)) { 2889 klass->SetStatus(mirror::Class::kStatusError, self); 2890 return nullptr; 2891 } 2892 2893 interfaces_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2894 throws_sfield->SetObject<false>(klass.get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2895 klass->SetStatus(mirror::Class::kStatusInitialized, self); 2896 } 2897 2898 // sanity checks 2899 if (kIsDebugBuild) { 2900 CHECK(klass->GetIFields() == NULL); 2901 CheckProxyConstructor(klass->GetDirectMethod(0)); 2902 for (size_t i = 0; i < num_virtual_methods; ++i) { 2903 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 2904 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 2905 SirtRef<mirror::ArtMethod> prototype(self, decoded_methods->Get(i)); 2906 CheckProxyMethod(klass->GetVirtualMethod(i), prototype); 2907 } 2908 2909 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 2910 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 2911 decoded_name->ToModifiedUtf8().c_str())); 2912 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 2913 2914 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 2915 decoded_name->ToModifiedUtf8().c_str())); 2916 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 2917 2918 mirror::SynthesizedProxyClass* synth_proxy_class = 2919 down_cast<mirror::SynthesizedProxyClass*>(klass.get()); 2920 CHECK_EQ(synth_proxy_class->GetInterfaces(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 2921 CHECK_EQ(synth_proxy_class->GetThrows(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 2922 } 2923 std::string descriptor(GetDescriptorForProxy(klass.get())); 2924 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.get(), Hash(descriptor.c_str())); 2925 CHECK(existing == nullptr); 2926 return klass.get(); 2927} 2928 2929std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 2930 DCHECK(proxy_class->IsProxyClass()); 2931 mirror::String* name = proxy_class->GetName(); 2932 DCHECK(name != NULL); 2933 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 2934} 2935 2936mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 2937 mirror::ArtMethod* proxy_method) { 2938 DCHECK(proxy_class->IsProxyClass()); 2939 DCHECK(proxy_method->IsProxyMethod()); 2940 // Locate the dex cache of the original interface/Object 2941 mirror::DexCache* dex_cache = NULL; 2942 { 2943 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 2944 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2945 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2946 if (dex_caches_[i]->GetResolvedTypes() == resolved_types) { 2947 dex_cache = dex_caches_[i]; 2948 break; 2949 } 2950 } 2951 } 2952 CHECK(dex_cache != NULL); 2953 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 2954 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 2955 CHECK(resolved_method != NULL); 2956 return resolved_method; 2957} 2958 2959 2960mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 2961 const SirtRef<mirror::Class>& klass, 2962 mirror::Class* proxy_class) { 2963 // Create constructor for Proxy that must initialize h 2964 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 2965 proxy_class->GetDirectMethods(); 2966 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 2967 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 2968 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 2969 // code_ too) 2970 mirror::ArtMethod* constructor = 2971 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 2972 if (constructor == NULL) { 2973 CHECK(self->IsExceptionPending()); // OOME. 2974 return NULL; 2975 } 2976 // Make this constructor public and fix the class to be our Proxy version 2977 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 2978 constructor->SetDeclaringClass(klass.get()); 2979 return constructor; 2980} 2981 2982static void CheckProxyConstructor(mirror::ArtMethod* constructor) 2983 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2984 CHECK(constructor->IsConstructor()); 2985 MethodHelper mh(constructor); 2986 CHECK_STREQ(mh.GetName(), "<init>"); 2987 CHECK_STREQ(mh.GetSignature().ToString().c_str(), "(Ljava/lang/reflect/InvocationHandler;)V"); 2988 DCHECK(constructor->IsPublic()); 2989} 2990 2991mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 2992 const SirtRef<mirror::Class>& klass, 2993 const SirtRef<mirror::ArtMethod>& prototype) { 2994 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 2995 // prototype method 2996 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 2997 prototype.get()); 2998 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 2999 // as necessary 3000 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3001 if (UNLIKELY(method == NULL)) { 3002 CHECK(self->IsExceptionPending()); // OOME. 3003 return NULL; 3004 } 3005 3006 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3007 // the intersection of throw exceptions as defined in Proxy 3008 method->SetDeclaringClass(klass.get()); 3009 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3010 3011 // At runtime the method looks like a reference and argument saving method, clone the code 3012 // related parameters from this method. 3013 mirror::ArtMethod* refs_and_args = 3014 Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 3015 method->SetCoreSpillMask(refs_and_args->GetCoreSpillMask()); 3016 method->SetFpSpillMask(refs_and_args->GetFpSpillMask()); 3017 method->SetFrameSizeInBytes(refs_and_args->GetFrameSizeInBytes()); 3018 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3019 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3020 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3021 3022 return method; 3023} 3024 3025static void CheckProxyMethod(mirror::ArtMethod* method, 3026 SirtRef<mirror::ArtMethod>& prototype) 3027 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3028 // Basic sanity 3029 CHECK(!prototype->IsFinal()); 3030 CHECK(method->IsFinal()); 3031 CHECK(!method->IsAbstract()); 3032 3033 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3034 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3035 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3036 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 3037 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 3038 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3039 3040 MethodHelper mh(method); 3041 MethodHelper mh2(prototype.get()); 3042 CHECK_STREQ(mh.GetName(), mh2.GetName()); 3043 CHECK_STREQ(mh.GetShorty(), mh2.GetShorty()); 3044 // More complex sanity - via dex cache 3045 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3046} 3047 3048static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3049 bool can_init_parents) 3050 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3051 if (can_init_statics && can_init_parents) { 3052 return true; 3053 } 3054 if (!can_init_statics) { 3055 // Check if there's a class initializer. 3056 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3057 if (clinit != NULL) { 3058 return false; 3059 } 3060 // Check if there are encoded static values needing initialization. 3061 if (klass->NumStaticFields() != 0) { 3062 ClassHelper kh(klass); 3063 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3064 DCHECK(dex_class_def != NULL); 3065 if (dex_class_def->static_values_off_ != 0) { 3066 return false; 3067 } 3068 } 3069 } 3070 if (!klass->IsInterface() && klass->HasSuperClass()) { 3071 mirror::Class* super_class = klass->GetSuperClass(); 3072 if (!can_init_parents && !super_class->IsInitialized()) { 3073 return false; 3074 } else { 3075 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3076 return false; 3077 } 3078 } 3079 } 3080 return true; 3081} 3082 3083bool ClassLinker::IsInitialized() const { 3084 return init_done_; 3085} 3086 3087bool ClassLinker::InitializeClass(const SirtRef<mirror::Class>& klass, bool can_init_statics, 3088 bool can_init_parents) { 3089 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3090 3091 // Are we already initialized and therefore done? 3092 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3093 // an initialized class will never change its state. 3094 if (klass->IsInitialized()) { 3095 return true; 3096 } 3097 3098 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3099 if (!CanWeInitializeClass(klass.get(), can_init_statics, can_init_parents)) { 3100 return false; 3101 } 3102 3103 Thread* self = Thread::Current(); 3104 uint64_t t0; 3105 { 3106 ObjectLock<mirror::Class> lock(self, &klass); 3107 3108 // Re-check under the lock in case another thread initialized ahead of us. 3109 if (klass->IsInitialized()) { 3110 return true; 3111 } 3112 3113 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3114 if (klass->IsErroneous()) { 3115 ThrowEarlierClassFailure(klass.get()); 3116 return false; 3117 } 3118 3119 CHECK(klass->IsResolved()) << PrettyClass(klass.get()) << ": state=" << klass->GetStatus(); 3120 3121 if (!klass->IsVerified()) { 3122 VerifyClass(klass); 3123 if (!klass->IsVerified()) { 3124 // We failed to verify, expect either the klass to be erroneous or verification failed at 3125 // compile time. 3126 if (klass->IsErroneous()) { 3127 CHECK(self->IsExceptionPending()); 3128 } else { 3129 CHECK(Runtime::Current()->IsCompiler()); 3130 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3131 } 3132 return false; 3133 } 3134 } 3135 3136 // If the class is kStatusInitializing, either this thread is 3137 // initializing higher up the stack or another thread has beat us 3138 // to initializing and we need to wait. Either way, this 3139 // invocation of InitializeClass will not be responsible for 3140 // running <clinit> and will return. 3141 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3142 // We caught somebody else in the act; was it us? 3143 if (klass->GetClinitThreadId() == self->GetTid()) { 3144 // Yes. That's fine. Return so we can continue initializing. 3145 return true; 3146 } 3147 // No. That's fine. Wait for another thread to finish initializing. 3148 return WaitForInitializeClass(klass, self, lock); 3149 } 3150 3151 if (!ValidateSuperClassDescriptors(klass)) { 3152 klass->SetStatus(mirror::Class::kStatusError, self); 3153 return false; 3154 } 3155 3156 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.get()); 3157 3158 // From here out other threads may observe that we're initializing and so changes of state 3159 // require the a notification. 3160 klass->SetClinitThreadId(self->GetTid()); 3161 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3162 3163 t0 = NanoTime(); 3164 } 3165 3166 // Initialize super classes, must be done while initializing for the JLS. 3167 if (!klass->IsInterface() && klass->HasSuperClass()) { 3168 mirror::Class* super_class = klass->GetSuperClass(); 3169 if (!super_class->IsInitialized()) { 3170 CHECK(!super_class->IsInterface()); 3171 CHECK(can_init_parents); 3172 SirtRef<mirror::Class> sirt_super(self, super_class); 3173 bool super_initialized = InitializeClass(sirt_super, can_init_statics, true); 3174 if (!super_initialized) { 3175 // The super class was verified ahead of entering initializing, we should only be here if 3176 // the super class became erroneous due to initialization. 3177 CHECK(sirt_super->IsErroneous() && self->IsExceptionPending()) 3178 << "Super class initialization failed for " << PrettyDescriptor(sirt_super.get()) 3179 << " that has unexpected status " << sirt_super->GetStatus() 3180 << "\nPending exception:\n" 3181 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3182 ObjectLock<mirror::Class> lock(self, &klass); 3183 // Initialization failed because the super-class is erroneous. 3184 klass->SetStatus(mirror::Class::kStatusError, self); 3185 return false; 3186 } 3187 } 3188 } 3189 3190 if (klass->NumStaticFields() > 0) { 3191 ClassHelper kh(klass.get()); 3192 const DexFile::ClassDef* dex_class_def = kh.GetClassDef(); 3193 CHECK(dex_class_def != NULL); 3194 const DexFile& dex_file = kh.GetDexFile(); 3195 SirtRef<mirror::ClassLoader> class_loader(self, klass->GetClassLoader()); 3196 SirtRef<mirror::DexCache> dex_cache(self, kh.GetDexCache()); 3197 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3198 this, *dex_class_def); 3199 if (it.HasNext()) { 3200 CHECK(can_init_statics); 3201 // We reordered the fields, so we need to be able to map the field indexes to the right fields. 3202 SafeMap<uint32_t, mirror::ArtField*> field_map; 3203 ConstructFieldMap(dex_file, *dex_class_def, klass.get(), field_map); 3204 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3205 if (Runtime::Current()->IsActiveTransaction()) { 3206 it.ReadValueToField<true>(field_map.Get(i)); 3207 } else { 3208 it.ReadValueToField<false>(field_map.Get(i)); 3209 } 3210 } 3211 } 3212 } 3213 3214 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3215 if (clinit != NULL) { 3216 CHECK(can_init_statics); 3217 if (LIKELY(Runtime::Current()->IsStarted())) { 3218 JValue result; 3219 clinit->Invoke(self, NULL, 0, &result, "V"); 3220 } else { 3221 art::interpreter::EnterInterpreterFromInvoke(self, clinit, NULL, NULL, NULL); 3222 } 3223 } 3224 3225 uint64_t t1 = NanoTime(); 3226 3227 bool success = true; 3228 { 3229 ObjectLock<mirror::Class> lock(self, &klass); 3230 3231 if (self->IsExceptionPending()) { 3232 WrapExceptionInInitializer(); 3233 klass->SetStatus(mirror::Class::kStatusError, self); 3234 success = false; 3235 } else { 3236 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3237 RuntimeStats* thread_stats = self->GetStats(); 3238 ++global_stats->class_init_count; 3239 ++thread_stats->class_init_count; 3240 global_stats->class_init_time_ns += (t1 - t0); 3241 thread_stats->class_init_time_ns += (t1 - t0); 3242 // Set the class as initialized except if failed to initialize static fields. 3243 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3244 if (VLOG_IS_ON(class_linker)) { 3245 ClassHelper kh(klass.get()); 3246 LOG(INFO) << "Initialized class " << kh.GetDescriptor() << " from " << kh.GetLocation(); 3247 } 3248 // Opportunistically set static method trampolines to their destination. 3249 FixupStaticTrampolines(klass.get()); 3250 } 3251 } 3252 return success; 3253} 3254 3255bool ClassLinker::WaitForInitializeClass(const SirtRef<mirror::Class>& klass, Thread* self, 3256 ObjectLock<mirror::Class>& lock) 3257 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3258 while (true) { 3259 self->AssertNoPendingException(); 3260 CHECK(!klass->IsInitialized()); 3261 lock.WaitIgnoringInterrupts(); 3262 3263 // When we wake up, repeat the test for init-in-progress. If 3264 // there's an exception pending (only possible if 3265 // "interruptShouldThrow" was set), bail out. 3266 if (self->IsExceptionPending()) { 3267 WrapExceptionInInitializer(); 3268 klass->SetStatus(mirror::Class::kStatusError, self); 3269 return false; 3270 } 3271 // Spurious wakeup? Go back to waiting. 3272 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3273 continue; 3274 } 3275 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3276 // Compile time initialization failed. 3277 return false; 3278 } 3279 if (klass->IsErroneous()) { 3280 // The caller wants an exception, but it was thrown in a 3281 // different thread. Synthesize one here. 3282 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3283 PrettyDescriptor(klass.get()).c_str()); 3284 return false; 3285 } 3286 if (klass->IsInitialized()) { 3287 return true; 3288 } 3289 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.get()) << " is " 3290 << klass->GetStatus(); 3291 } 3292 LOG(FATAL) << "Not Reached" << PrettyClass(klass.get()); 3293} 3294 3295bool ClassLinker::ValidateSuperClassDescriptors(const SirtRef<mirror::Class>& klass) { 3296 if (klass->IsInterface()) { 3297 return true; 3298 } 3299 Thread* self = Thread::Current(); 3300 // begin with the methods local to the superclass 3301 if (klass->HasSuperClass() && 3302 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3303 SirtRef<mirror::Class> super(self, klass->GetSuperClass()); 3304 for (int i = super->GetVTable()->GetLength() - 1; i >= 0; --i) { 3305 mirror::ArtMethod* method = klass->GetVTable()->Get(i); 3306 if (method != super->GetVTable()->Get(i) && 3307 !IsSameMethodSignatureInDifferentClassContexts(self, method, super.get(), klass.get())) { 3308 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in superclass %s", 3309 PrettyDescriptor(klass.get()).c_str(), PrettyMethod(method).c_str(), 3310 PrettyDescriptor(super.get()).c_str()); 3311 return false; 3312 } 3313 } 3314 } 3315 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3316 SirtRef<mirror::Class> interface(self, klass->GetIfTable()->GetInterface(i)); 3317 if (klass->GetClassLoader() != interface->GetClassLoader()) { 3318 for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { 3319 mirror::ArtMethod* method = klass->GetIfTable()->GetMethodArray(i)->Get(j); 3320 if (!IsSameMethodSignatureInDifferentClassContexts(self, method, interface.get(), 3321 method->GetDeclaringClass())) { 3322 ThrowLinkageError(klass.get(), "Class %s method %s resolves differently in interface %s", 3323 PrettyDescriptor(method->GetDeclaringClass()).c_str(), 3324 PrettyMethod(method).c_str(), 3325 PrettyDescriptor(interface.get()).c_str()); 3326 return false; 3327 } 3328 } 3329 } 3330 } 3331 return true; 3332} 3333 3334// Returns true if classes referenced by the signature of the method are the 3335// same classes in klass1 as they are in klass2. 3336bool ClassLinker::IsSameMethodSignatureInDifferentClassContexts(Thread* self, 3337 mirror::ArtMethod* method, 3338 mirror::Class* klass1, 3339 mirror::Class* klass2) { 3340 if (klass1 == klass2) { 3341 return true; 3342 } 3343 CHECK(klass1 != nullptr); 3344 CHECK(klass2 != nullptr); 3345 SirtRef<mirror::ClassLoader> loader1(self, klass1->GetClassLoader()); 3346 SirtRef<mirror::ClassLoader> loader2(self, klass2->GetClassLoader()); 3347 const DexFile& dex_file = *method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 3348 const DexFile::ProtoId& proto_id = 3349 dex_file.GetMethodPrototype(dex_file.GetMethodId(method->GetDexMethodIndex())); 3350 for (DexFileParameterIterator it(dex_file, proto_id); it.HasNext(); it.Next()) { 3351 const char* descriptor = it.GetDescriptor(); 3352 if (descriptor == nullptr) { 3353 break; 3354 } 3355 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3356 // Found a non-primitive type. 3357 if (!IsSameDescriptorInDifferentClassContexts(self, descriptor, loader1, loader2)) { 3358 return false; 3359 } 3360 } 3361 } 3362 // Check the return type 3363 const char* descriptor = dex_file.GetReturnTypeDescriptor(proto_id); 3364 if (descriptor[0] == 'L' || descriptor[0] == '[') { 3365 if (!IsSameDescriptorInDifferentClassContexts(self, descriptor, loader1, loader2)) { 3366 return false; 3367 } 3368 } 3369 return true; 3370} 3371 3372// Returns true if the descriptor resolves to the same class in the context of loader1 and loader2. 3373bool ClassLinker::IsSameDescriptorInDifferentClassContexts(Thread* self, const char* descriptor, 3374 SirtRef<mirror::ClassLoader>& loader1, 3375 SirtRef<mirror::ClassLoader>& loader2) { 3376 CHECK(descriptor != nullptr); 3377 SirtRef<mirror::Class> found1(self, FindClass(self, descriptor, loader1)); 3378 if (found1.get() == nullptr) { 3379 self->ClearException(); 3380 } 3381 mirror::Class* found2 = FindClass(self, descriptor, loader2); 3382 if (found2 == nullptr) { 3383 self->ClearException(); 3384 } 3385 return found1.get() == found2; 3386} 3387 3388bool ClassLinker::EnsureInitialized(const SirtRef<mirror::Class>& c, bool can_init_fields, 3389 bool can_init_parents) { 3390 DCHECK(c.get() != NULL); 3391 if (c->IsInitialized()) { 3392 return true; 3393 } 3394 3395 bool success = InitializeClass(c, can_init_fields, can_init_parents); 3396 if (!success) { 3397 if (can_init_fields && can_init_parents) { 3398 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.get()); 3399 } 3400 } 3401 return success; 3402} 3403 3404void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3405 mirror::Class* c, 3406 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3407 const byte* class_data = dex_file.GetClassData(dex_class_def); 3408 ClassDataItemIterator it(dex_file, class_data); 3409 Thread* self = Thread::Current(); 3410 SirtRef<mirror::DexCache> dex_cache(self, c->GetDexCache()); 3411 SirtRef<mirror::ClassLoader> class_loader(self, c->GetClassLoader()); 3412 CHECK(!kMovingFields); 3413 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3414 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3415 } 3416} 3417 3418bool ClassLinker::LinkClass(Thread* self, const SirtRef<mirror::Class>& klass, 3419 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3420 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3421 if (!LinkSuperClass(klass)) { 3422 return false; 3423 } 3424 if (!LinkMethods(klass, interfaces)) { 3425 return false; 3426 } 3427 if (!LinkInstanceFields(klass)) { 3428 return false; 3429 } 3430 if (!LinkStaticFields(klass)) { 3431 return false; 3432 } 3433 CreateReferenceInstanceOffsets(klass); 3434 CreateReferenceStaticOffsets(klass); 3435 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3436 klass->SetStatus(mirror::Class::kStatusResolved, self); 3437 return true; 3438} 3439 3440bool ClassLinker::LoadSuperAndInterfaces(const SirtRef<mirror::Class>& klass, 3441 const DexFile& dex_file) { 3442 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3443 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3444 uint16_t super_class_idx = class_def.superclass_idx_; 3445 if (super_class_idx != DexFile::kDexNoIndex16) { 3446 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.get()); 3447 if (super_class == NULL) { 3448 DCHECK(Thread::Current()->IsExceptionPending()); 3449 return false; 3450 } 3451 // Verify 3452 if (!klass->CanAccess(super_class)) { 3453 ThrowIllegalAccessError(klass.get(), "Class %s extended by class %s is inaccessible", 3454 PrettyDescriptor(super_class).c_str(), 3455 PrettyDescriptor(klass.get()).c_str()); 3456 return false; 3457 } 3458 klass->SetSuperClass(super_class); 3459 } 3460 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3461 if (interfaces != NULL) { 3462 for (size_t i = 0; i < interfaces->Size(); i++) { 3463 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3464 mirror::Class* interface = ResolveType(dex_file, idx, klass.get()); 3465 if (interface == NULL) { 3466 DCHECK(Thread::Current()->IsExceptionPending()); 3467 return false; 3468 } 3469 // Verify 3470 if (!klass->CanAccess(interface)) { 3471 // TODO: the RI seemed to ignore this in my testing. 3472 ThrowIllegalAccessError(klass.get(), "Interface %s implemented by class %s is inaccessible", 3473 PrettyDescriptor(interface).c_str(), 3474 PrettyDescriptor(klass.get()).c_str()); 3475 return false; 3476 } 3477 } 3478 } 3479 // Mark the class as loaded. 3480 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3481 return true; 3482} 3483 3484bool ClassLinker::LinkSuperClass(const SirtRef<mirror::Class>& klass) { 3485 CHECK(!klass->IsPrimitive()); 3486 mirror::Class* super = klass->GetSuperClass(); 3487 if (klass.get() == GetClassRoot(kJavaLangObject)) { 3488 if (super != NULL) { 3489 ThrowClassFormatError(klass.get(), "java.lang.Object must not have a superclass"); 3490 return false; 3491 } 3492 return true; 3493 } 3494 if (super == NULL) { 3495 ThrowLinkageError(klass.get(), "No superclass defined for class %s", 3496 PrettyDescriptor(klass.get()).c_str()); 3497 return false; 3498 } 3499 // Verify 3500 if (super->IsFinal() || super->IsInterface()) { 3501 ThrowIncompatibleClassChangeError(klass.get(), "Superclass %s of %s is %s", 3502 PrettyDescriptor(super).c_str(), 3503 PrettyDescriptor(klass.get()).c_str(), 3504 super->IsFinal() ? "declared final" : "an interface"); 3505 return false; 3506 } 3507 if (!klass->CanAccess(super)) { 3508 ThrowIllegalAccessError(klass.get(), "Superclass %s is inaccessible to class %s", 3509 PrettyDescriptor(super).c_str(), 3510 PrettyDescriptor(klass.get()).c_str()); 3511 return false; 3512 } 3513 3514 // Inherit kAccClassIsFinalizable from the superclass in case this class doesn't override finalize. 3515 if (super->IsFinalizable()) { 3516 klass->SetFinalizable(); 3517 } 3518 3519 // Inherit reference flags (if any) from the superclass. 3520 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3521 if (reference_flags != 0) { 3522 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3523 } 3524 // Disallow custom direct subclasses of java.lang.ref.Reference. 3525 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3526 ThrowLinkageError(klass.get(), 3527 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3528 PrettyDescriptor(klass.get()).c_str()); 3529 return false; 3530 } 3531 3532 if (kIsDebugBuild) { 3533 // Ensure super classes are fully resolved prior to resolving fields.. 3534 while (super != NULL) { 3535 CHECK(super->IsResolved()); 3536 super = super->GetSuperClass(); 3537 } 3538 } 3539 return true; 3540} 3541 3542// Populate the class vtable and itable. Compute return type indices. 3543bool ClassLinker::LinkMethods(const SirtRef<mirror::Class>& klass, 3544 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3545 if (klass->IsInterface()) { 3546 // No vtable. 3547 size_t count = klass->NumVirtualMethods(); 3548 if (!IsUint(16, count)) { 3549 ThrowClassFormatError(klass.get(), "Too many methods on interface: %zd", count); 3550 return false; 3551 } 3552 for (size_t i = 0; i < count; ++i) { 3553 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3554 } 3555 // Link interface method tables 3556 return LinkInterfaceMethods(klass, interfaces); 3557 } else { 3558 // Link virtual and interface method tables 3559 return LinkVirtualMethods(klass) && LinkInterfaceMethods(klass, interfaces); 3560 } 3561 return true; 3562} 3563 3564bool ClassLinker::LinkVirtualMethods(const SirtRef<mirror::Class>& klass) { 3565 Thread* self = Thread::Current(); 3566 if (klass->HasSuperClass()) { 3567 uint32_t max_count = klass->NumVirtualMethods() + klass->GetSuperClass()->GetVTable()->GetLength(); 3568 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3569 CHECK_LE(actual_count, max_count); 3570 // TODO: do not assign to the vtable field until it is fully constructed. 3571 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3572 vtable(self, klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count)); 3573 if (UNLIKELY(vtable.get() == NULL)) { 3574 CHECK(self->IsExceptionPending()); // OOME. 3575 return false; 3576 } 3577 // See if any of our virtual methods override the superclass. 3578 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3579 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3580 MethodHelper local_mh(local_method); 3581 size_t j = 0; 3582 for (; j < actual_count; ++j) { 3583 mirror::ArtMethod* super_method = vtable->Get(j); 3584 MethodHelper super_mh(super_method); 3585 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3586 if (klass->CanAccessMember(super_method->GetDeclaringClass(), super_method->GetAccessFlags())) { 3587 if (super_method->IsFinal()) { 3588 ThrowLinkageError(klass.get(), "Method %s overrides final method in class %s", 3589 PrettyMethod(local_method).c_str(), 3590 super_mh.GetDeclaringClassDescriptor()); 3591 return false; 3592 } 3593 vtable->Set<false>(j, local_method); 3594 local_method->SetMethodIndex(j); 3595 break; 3596 } else { 3597 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3598 << " would have incorrectly overridden the package-private method in " 3599 << PrettyDescriptor(super_mh.GetDeclaringClassDescriptor()); 3600 } 3601 } 3602 } 3603 if (j == actual_count) { 3604 // Not overriding, append. 3605 vtable->Set<false>(actual_count, local_method); 3606 local_method->SetMethodIndex(actual_count); 3607 actual_count += 1; 3608 } 3609 } 3610 if (!IsUint(16, actual_count)) { 3611 ThrowClassFormatError(klass.get(), "Too many methods defined on class: %zd", actual_count); 3612 return false; 3613 } 3614 // Shrink vtable if possible 3615 CHECK_LE(actual_count, max_count); 3616 if (actual_count < max_count) { 3617 vtable.reset(vtable->CopyOf(self, actual_count)); 3618 if (UNLIKELY(vtable.get() == NULL)) { 3619 CHECK(self->IsExceptionPending()); // OOME. 3620 return false; 3621 } 3622 } 3623 klass->SetVTable(vtable.get()); 3624 } else { 3625 CHECK(klass.get() == GetClassRoot(kJavaLangObject)); 3626 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3627 if (!IsUint(16, num_virtual_methods)) { 3628 ThrowClassFormatError(klass.get(), "Too many methods: %d", num_virtual_methods); 3629 return false; 3630 } 3631 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3632 vtable(self, AllocArtMethodArray(self, num_virtual_methods)); 3633 if (UNLIKELY(vtable.get() == NULL)) { 3634 CHECK(self->IsExceptionPending()); // OOME. 3635 return false; 3636 } 3637 for (size_t i = 0; i < num_virtual_methods; ++i) { 3638 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3639 vtable->Set<false>(i, virtual_method); 3640 virtual_method->SetMethodIndex(i & 0xFFFF); 3641 } 3642 klass->SetVTable(vtable.get()); 3643 } 3644 return true; 3645} 3646 3647bool ClassLinker::LinkInterfaceMethods(const SirtRef<mirror::Class>& klass, 3648 const SirtRef<mirror::ObjectArray<mirror::Class> >& interfaces) { 3649 // Set the imt table to be all conflicts by default. 3650 klass->SetImTable(Runtime::Current()->GetDefaultImt()); 3651 size_t super_ifcount; 3652 if (klass->HasSuperClass()) { 3653 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3654 } else { 3655 super_ifcount = 0; 3656 } 3657 size_t ifcount = super_ifcount; 3658 uint32_t num_interfaces; 3659 { 3660 ClassHelper kh(klass.get()); 3661 num_interfaces = 3662 interfaces.get() == nullptr ? kh.NumDirectInterfaces() : interfaces->GetLength(); 3663 ifcount += num_interfaces; 3664 for (size_t i = 0; i < num_interfaces; i++) { 3665 mirror::Class* interface = 3666 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3667 ifcount += interface->GetIfTableCount(); 3668 } 3669 } 3670 if (ifcount == 0) { 3671 // Class implements no interfaces. 3672 DCHECK_EQ(klass->GetIfTableCount(), 0); 3673 DCHECK(klass->GetIfTable() == NULL); 3674 return true; 3675 } 3676 if (ifcount == super_ifcount) { 3677 // Class implements same interfaces as parent, are any of these not marker interfaces? 3678 bool has_non_marker_interface = false; 3679 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3680 for (size_t i = 0; i < ifcount; ++i) { 3681 if (super_iftable->GetMethodArrayCount(i) > 0) { 3682 has_non_marker_interface = true; 3683 break; 3684 } 3685 } 3686 if (!has_non_marker_interface) { 3687 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3688 klass->SetIfTable(super_iftable); 3689 return true; 3690 } 3691 } 3692 Thread* self = Thread::Current(); 3693 SirtRef<mirror::IfTable> iftable(self, AllocIfTable(self, ifcount)); 3694 if (UNLIKELY(iftable.get() == NULL)) { 3695 CHECK(self->IsExceptionPending()); // OOME. 3696 return false; 3697 } 3698 if (super_ifcount != 0) { 3699 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3700 for (size_t i = 0; i < super_ifcount; i++) { 3701 mirror::Class* super_interface = super_iftable->GetInterface(i); 3702 iftable->SetInterface(i, super_interface); 3703 } 3704 } 3705 // Flatten the interface inheritance hierarchy. 3706 size_t idx = super_ifcount; 3707 for (size_t i = 0; i < num_interfaces; i++) { 3708 ClassHelper kh(klass.get()); 3709 mirror::Class* interface = 3710 interfaces.get() == nullptr ? kh.GetDirectInterface(i) : interfaces->Get(i); 3711 DCHECK(interface != NULL); 3712 if (!interface->IsInterface()) { 3713 ClassHelper ih(interface); 3714 ThrowIncompatibleClassChangeError(klass.get(), "Class %s implements non-interface class %s", 3715 PrettyDescriptor(klass.get()).c_str(), 3716 PrettyDescriptor(ih.GetDescriptor()).c_str()); 3717 return false; 3718 } 3719 // Check if interface is already in iftable 3720 bool duplicate = false; 3721 for (size_t j = 0; j < idx; j++) { 3722 mirror::Class* existing_interface = iftable->GetInterface(j); 3723 if (existing_interface == interface) { 3724 duplicate = true; 3725 break; 3726 } 3727 } 3728 if (!duplicate) { 3729 // Add this non-duplicate interface. 3730 iftable->SetInterface(idx++, interface); 3731 // Add this interface's non-duplicate super-interfaces. 3732 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3733 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3734 bool super_duplicate = false; 3735 for (size_t k = 0; k < idx; k++) { 3736 mirror::Class* existing_interface = iftable->GetInterface(k); 3737 if (existing_interface == super_interface) { 3738 super_duplicate = true; 3739 break; 3740 } 3741 } 3742 if (!super_duplicate) { 3743 iftable->SetInterface(idx++, super_interface); 3744 } 3745 } 3746 } 3747 } 3748 // Shrink iftable in case duplicates were found 3749 if (idx < ifcount) { 3750 iftable.reset(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3751 if (UNLIKELY(iftable.get() == NULL)) { 3752 CHECK(self->IsExceptionPending()); // OOME. 3753 return false; 3754 } 3755 ifcount = idx; 3756 } else { 3757 CHECK_EQ(idx, ifcount); 3758 } 3759 klass->SetIfTable(iftable.get()); 3760 3761 // If we're an interface, we don't need the vtable pointers, so we're done. 3762 if (klass->IsInterface()) { 3763 return true; 3764 } 3765 // Allocate imtable 3766 bool imtable_changed = false; 3767 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > imtable(self, AllocArtMethodArray(self, kImtSize)); 3768 if (UNLIKELY(imtable.get() == NULL)) { 3769 CHECK(self->IsExceptionPending()); // OOME. 3770 return false; 3771 } 3772 std::vector<mirror::ArtMethod*> miranda_list; 3773 for (size_t i = 0; i < ifcount; ++i) { 3774 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 3775 if (num_methods > 0) { 3776 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3777 method_array(self, AllocArtMethodArray(self, num_methods)); 3778 if (UNLIKELY(method_array.get() == nullptr)) { 3779 CHECK(self->IsExceptionPending()); // OOME. 3780 return false; 3781 } 3782 iftable->SetMethodArray(i, method_array.get()); 3783 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > vtable(self, 3784 klass->GetVTableDuringLinking()); 3785 for (size_t j = 0; j < num_methods; ++j) { 3786 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 3787 MethodHelper interface_mh(interface_method); 3788 int32_t k; 3789 // For each method listed in the interface's method list, find the 3790 // matching method in our class's method list. We want to favor the 3791 // subclass over the superclass, which just requires walking 3792 // back from the end of the vtable. (This only matters if the 3793 // superclass defines a private method and this class redefines 3794 // it -- otherwise it would use the same vtable slot. In .dex files 3795 // those don't end up in the virtual method table, so it shouldn't 3796 // matter which direction we go. We walk it backward anyway.) 3797 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3798 mirror::ArtMethod* vtable_method = vtable->Get(k); 3799 MethodHelper vtable_mh(vtable_method); 3800 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3801 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3802 ThrowIllegalAccessError(klass.get(), 3803 "Method '%s' implementing interface method '%s' is not public", 3804 PrettyMethod(vtable_method).c_str(), 3805 PrettyMethod(interface_method).c_str()); 3806 return false; 3807 } 3808 method_array->Set<false>(j, vtable_method); 3809 // Place method in imt if entry is empty, place conflict otherwise. 3810 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3811 if (imtable->Get(imt_index) == NULL) { 3812 imtable->Set<false>(imt_index, vtable_method); 3813 imtable_changed = true; 3814 } else { 3815 imtable->Set<false>(imt_index, Runtime::Current()->GetImtConflictMethod()); 3816 } 3817 break; 3818 } 3819 } 3820 if (k < 0) { 3821 SirtRef<mirror::ArtMethod> miranda_method(self, NULL); 3822 for (size_t mir = 0; mir < miranda_list.size(); mir++) { 3823 mirror::ArtMethod* mir_method = miranda_list[mir]; 3824 MethodHelper vtable_mh(mir_method); 3825 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3826 miranda_method.reset(miranda_list[mir]); 3827 break; 3828 } 3829 } 3830 if (miranda_method.get() == NULL) { 3831 // Point the interface table at a phantom slot. 3832 miranda_method.reset(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3833 if (UNLIKELY(miranda_method.get() == NULL)) { 3834 CHECK(self->IsExceptionPending()); // OOME. 3835 return false; 3836 } 3837 // TODO: If a methods move then the miranda_list may hold stale references. 3838 miranda_list.push_back(miranda_method.get()); 3839 } 3840 method_array->Set<false>(j, miranda_method.get()); 3841 } 3842 } 3843 } 3844 } 3845 if (imtable_changed) { 3846 // Fill in empty entries in interface method table with conflict. 3847 mirror::ArtMethod* imt_conflict_method = Runtime::Current()->GetImtConflictMethod(); 3848 for (size_t i = 0; i < kImtSize; i++) { 3849 if (imtable->Get(i) == NULL) { 3850 imtable->Set<false>(i, imt_conflict_method); 3851 } 3852 } 3853 klass->SetImTable(imtable.get()); 3854 } 3855 if (!miranda_list.empty()) { 3856 int old_method_count = klass->NumVirtualMethods(); 3857 int new_method_count = old_method_count + miranda_list.size(); 3858 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3859 if (old_method_count == 0) { 3860 virtuals = AllocArtMethodArray(self, new_method_count); 3861 } else { 3862 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3863 } 3864 if (UNLIKELY(virtuals == NULL)) { 3865 CHECK(self->IsExceptionPending()); // OOME. 3866 return false; 3867 } 3868 klass->SetVirtualMethods(virtuals); 3869 3870 SirtRef<mirror::ObjectArray<mirror::ArtMethod> > 3871 vtable(self, klass->GetVTableDuringLinking()); 3872 CHECK(vtable.get() != NULL); 3873 int old_vtable_count = vtable->GetLength(); 3874 int new_vtable_count = old_vtable_count + miranda_list.size(); 3875 vtable.reset(vtable->CopyOf(self, new_vtable_count)); 3876 if (UNLIKELY(vtable.get() == NULL)) { 3877 CHECK(self->IsExceptionPending()); // OOME. 3878 return false; 3879 } 3880 for (size_t i = 0; i < miranda_list.size(); ++i) { 3881 mirror::ArtMethod* method = miranda_list[i]; 3882 // Leave the declaring class alone as type indices are relative to it 3883 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 3884 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 3885 klass->SetVirtualMethod(old_method_count + i, method); 3886 vtable->Set<false>(old_vtable_count + i, method); 3887 } 3888 // TODO: do not assign to the vtable field until it is fully constructed. 3889 klass->SetVTable(vtable.get()); 3890 } 3891 3892 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 3893 for (int i = 0; i < vtable->GetLength(); ++i) { 3894 CHECK(vtable->Get(i) != NULL); 3895 } 3896 3897// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 3898 3899 return true; 3900} 3901 3902bool ClassLinker::LinkInstanceFields(const SirtRef<mirror::Class>& klass) { 3903 CHECK(klass.get() != NULL); 3904 return LinkFields(klass, false); 3905} 3906 3907bool ClassLinker::LinkStaticFields(const SirtRef<mirror::Class>& klass) { 3908 CHECK(klass.get() != NULL); 3909 size_t allocated_class_size = klass->GetClassSize(); 3910 bool success = LinkFields(klass, true); 3911 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 3912 return success; 3913} 3914 3915struct LinkFieldsComparator { 3916 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3917 } 3918 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 3919 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 3920 NO_THREAD_SAFETY_ANALYSIS { 3921 // First come reference fields, then 64-bit, and finally 32-bit 3922 FieldHelper fh1(field1); 3923 Primitive::Type type1 = fh1.GetTypeAsPrimitiveType(); 3924 FieldHelper fh2(field2); 3925 Primitive::Type type2 = fh2.GetTypeAsPrimitiveType(); 3926 if (type1 != type2) { 3927 bool is_primitive1 = type1 != Primitive::kPrimNot; 3928 bool is_primitive2 = type2 != Primitive::kPrimNot; 3929 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || type1 == Primitive::kPrimDouble); 3930 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || type2 == Primitive::kPrimDouble); 3931 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 3932 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 3933 if (order1 != order2) { 3934 return order1 < order2; 3935 } 3936 } 3937 // same basic group? then sort by string. 3938 const char* name1 = fh1.GetName(); 3939 const char* name2 = fh2.GetName(); 3940 return strcmp(name1, name2) < 0; 3941 } 3942}; 3943 3944bool ClassLinker::LinkFields(const SirtRef<mirror::Class>& klass, bool is_static) { 3945 size_t num_fields = 3946 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 3947 3948 mirror::ObjectArray<mirror::ArtField>* fields = 3949 is_static ? klass->GetSFields() : klass->GetIFields(); 3950 3951 // Initialize size and field_offset 3952 size_t size; 3953 MemberOffset field_offset(0); 3954 if (is_static) { 3955 size = klass->GetClassSize(); 3956 field_offset = mirror::Class::FieldsOffset(); 3957 } else { 3958 mirror::Class* super_class = klass->GetSuperClass(); 3959 if (super_class != NULL) { 3960 CHECK(super_class->IsResolved()); 3961 field_offset = MemberOffset(super_class->GetObjectSize()); 3962 } 3963 size = field_offset.Uint32Value(); 3964 } 3965 3966 CHECK_EQ(num_fields == 0, fields == NULL); 3967 3968 // we want a relatively stable order so that adding new fields 3969 // minimizes disruption of C++ version such as Class and Method. 3970 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 3971 for (size_t i = 0; i < num_fields; i++) { 3972 mirror::ArtField* f = fields->Get(i); 3973 CHECK(f != NULL); 3974 grouped_and_sorted_fields.push_back(f); 3975 } 3976 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 3977 LinkFieldsComparator()); 3978 3979 // References should be at the front. 3980 size_t current_field = 0; 3981 size_t num_reference_fields = 0; 3982 for (; current_field < num_fields; current_field++) { 3983 mirror::ArtField* field = grouped_and_sorted_fields.front(); 3984 FieldHelper fh(field); 3985 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 3986 bool isPrimitive = type != Primitive::kPrimNot; 3987 if (isPrimitive) { 3988 break; // past last reference, move on to the next phase 3989 } 3990 grouped_and_sorted_fields.pop_front(); 3991 num_reference_fields++; 3992 fields->Set<false>(current_field, field); 3993 field->SetOffset(field_offset); 3994 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 3995 } 3996 3997 // Now we want to pack all of the double-wide fields together. If 3998 // we're not aligned, though, we want to shuffle one 32-bit field 3999 // into place. If we can't find one, we'll have to pad it. 4000 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4001 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4002 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4003 FieldHelper fh(field); 4004 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4005 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 4006 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4007 continue; 4008 } 4009 fields->Set<false>(current_field++, field); 4010 field->SetOffset(field_offset); 4011 // drop the consumed field 4012 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4013 break; 4014 } 4015 // whether we found a 32-bit field for padding or not, we advance 4016 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4017 } 4018 4019 // Alignment is good, shuffle any double-wide fields forward, and 4020 // finish assigning field offsets to all fields. 4021 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())); 4022 while (!grouped_and_sorted_fields.empty()) { 4023 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4024 grouped_and_sorted_fields.pop_front(); 4025 FieldHelper fh(field); 4026 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4027 CHECK(type != Primitive::kPrimNot); // should only be working on primitive types 4028 fields->Set<false>(current_field, field); 4029 field->SetOffset(field_offset); 4030 field_offset = MemberOffset(field_offset.Uint32Value() + 4031 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4032 ? sizeof(uint64_t) 4033 : sizeof(uint32_t))); 4034 current_field++; 4035 } 4036 4037 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4038 if (!is_static && 4039 (strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0)) { 4040 // We know there are no non-reference fields in the Reference classes, and we know 4041 // that 'referent' is alphabetically last, so this is easy... 4042 CHECK_EQ(num_reference_fields, num_fields); 4043 FieldHelper fh(fields->Get(num_fields - 1)); 4044 CHECK_STREQ(fh.GetName(), "referent"); 4045 --num_reference_fields; 4046 } 4047 4048 if (kIsDebugBuild) { 4049 // Make sure that all reference fields appear before 4050 // non-reference fields, and all double-wide fields are aligned. 4051 bool seen_non_ref = false; 4052 for (size_t i = 0; i < num_fields; i++) { 4053 mirror::ArtField* field = fields->Get(i); 4054 if (false) { // enable to debug field layout 4055 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4056 << " class=" << PrettyClass(klass.get()) 4057 << " field=" << PrettyField(field) 4058 << " offset=" << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset()), 4059 false); 4060 } 4061 FieldHelper fh(field); 4062 Primitive::Type type = fh.GetTypeAsPrimitiveType(); 4063 bool is_primitive = type != Primitive::kPrimNot; 4064 if ((strcmp("Ljava/lang/ref/Reference;", ClassHelper(klass.get()).GetDescriptor()) == 0) 4065 && (strcmp("referent", fh.GetName()) == 0)) { 4066 is_primitive = true; // We lied above, so we have to expect a lie here. 4067 } 4068 if (is_primitive) { 4069 if (!seen_non_ref) { 4070 seen_non_ref = true; 4071 DCHECK_EQ(num_reference_fields, i); 4072 } 4073 } else { 4074 DCHECK(!seen_non_ref); 4075 } 4076 } 4077 if (!seen_non_ref) { 4078 DCHECK_EQ(num_fields, num_reference_fields); 4079 } 4080 } 4081 size = field_offset.Uint32Value(); 4082 // Update klass 4083 if (is_static) { 4084 klass->SetNumReferenceStaticFields(num_reference_fields); 4085 klass->SetClassSize(size); 4086 } else { 4087 klass->SetNumReferenceInstanceFields(num_reference_fields); 4088 if (!klass->IsVariableSize()) { 4089 DCHECK_GE(size, sizeof(mirror::Object)) << ClassHelper(klass.get()).GetDescriptor(); 4090 size_t previous_size = klass->GetObjectSize(); 4091 if (previous_size != 0) { 4092 // Make sure that we didn't originally have an incorrect size. 4093 CHECK_EQ(previous_size, size); 4094 } 4095 klass->SetObjectSize(size); 4096 } 4097 } 4098 return true; 4099} 4100 4101// Set the bitmap of reference offsets, refOffsets, from the ifields 4102// list. 4103void ClassLinker::CreateReferenceInstanceOffsets(const SirtRef<mirror::Class>& klass) { 4104 uint32_t reference_offsets = 0; 4105 mirror::Class* super_class = klass->GetSuperClass(); 4106 if (super_class != NULL) { 4107 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4108 // If our superclass overflowed, we don't stand a chance. 4109 if (reference_offsets == CLASS_WALK_SUPER) { 4110 klass->SetReferenceInstanceOffsets(reference_offsets); 4111 return; 4112 } 4113 } 4114 CreateReferenceOffsets(klass, false, reference_offsets); 4115} 4116 4117void ClassLinker::CreateReferenceStaticOffsets(const SirtRef<mirror::Class>& klass) { 4118 CreateReferenceOffsets(klass, true, 0); 4119} 4120 4121void ClassLinker::CreateReferenceOffsets(const SirtRef<mirror::Class>& klass, bool is_static, 4122 uint32_t reference_offsets) { 4123 size_t num_reference_fields = 4124 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4125 : klass->NumReferenceInstanceFieldsDuringLinking(); 4126 mirror::ObjectArray<mirror::ArtField>* fields = 4127 is_static ? klass->GetSFields() : klass->GetIFields(); 4128 // All of the fields that contain object references are guaranteed 4129 // to be at the beginning of the fields list. 4130 for (size_t i = 0; i < num_reference_fields; ++i) { 4131 // Note that byte_offset is the offset from the beginning of 4132 // object, not the offset into instance data 4133 mirror::ArtField* field = fields->Get(i); 4134 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4135 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4136 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4137 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4138 CHECK_NE(new_bit, 0U); 4139 reference_offsets |= new_bit; 4140 } else { 4141 reference_offsets = CLASS_WALK_SUPER; 4142 break; 4143 } 4144 } 4145 // Update fields in klass 4146 if (is_static) { 4147 klass->SetReferenceStaticOffsets(reference_offsets); 4148 } else { 4149 klass->SetReferenceInstanceOffsets(reference_offsets); 4150 } 4151} 4152 4153mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4154 const SirtRef<mirror::DexCache>& dex_cache) { 4155 DCHECK(dex_cache.get() != nullptr); 4156 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4157 if (resolved != NULL) { 4158 return resolved; 4159 } 4160 uint32_t utf16_length; 4161 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4162 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4163 dex_cache->SetResolvedString(string_idx, string); 4164 return string; 4165} 4166 4167mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4168 mirror::Class* referrer) { 4169 Thread* self = Thread::Current(); 4170 SirtRef<mirror::DexCache> dex_cache(self, referrer->GetDexCache()); 4171 SirtRef<mirror::ClassLoader> class_loader(self, referrer->GetClassLoader()); 4172 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4173} 4174 4175mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4176 const SirtRef<mirror::DexCache>& dex_cache, 4177 const SirtRef<mirror::ClassLoader>& class_loader) { 4178 DCHECK(dex_cache.get() != NULL); 4179 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4180 if (resolved == NULL) { 4181 Thread* self = Thread::Current(); 4182 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4183 resolved = FindClass(self, descriptor, class_loader); 4184 if (resolved != NULL) { 4185 // TODO: we used to throw here if resolved's class loader was not the 4186 // boot class loader. This was to permit different classes with the 4187 // same name to be loaded simultaneously by different loaders 4188 dex_cache->SetResolvedType(type_idx, resolved); 4189 } else { 4190 CHECK(self->IsExceptionPending()) 4191 << "Expected pending exception for failed resolution of: " << descriptor; 4192 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4193 SirtRef<mirror::Throwable> cause(self, self->GetException(NULL)); 4194 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4195 DCHECK(resolved == NULL); // No SirtRef needed to preserve resolved. 4196 self->ClearException(); 4197 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4198 self->GetException(NULL)->SetCause(cause.get()); 4199 } 4200 } 4201 } 4202 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4203 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4204 return resolved; 4205} 4206 4207mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, 4208 uint32_t method_idx, 4209 const SirtRef<mirror::DexCache>& dex_cache, 4210 const SirtRef<mirror::ClassLoader>& class_loader, 4211 mirror::ArtMethod* referrer, 4212 InvokeType type) { 4213 DCHECK(dex_cache.get() != NULL); 4214 // Check for hit in the dex cache. 4215 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4216 if (resolved != NULL && !resolved->IsRuntimeMethod()) { 4217 return resolved; 4218 } 4219 // Fail, get the declaring class. 4220 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4221 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4222 if (klass == NULL) { 4223 DCHECK(Thread::Current()->IsExceptionPending()); 4224 return NULL; 4225 } 4226 // Scan using method_idx, this saves string compares but will only hit for matching dex 4227 // caches/files. 4228 switch (type) { 4229 case kDirect: // Fall-through. 4230 case kStatic: 4231 resolved = klass->FindDirectMethod(dex_cache.get(), method_idx); 4232 break; 4233 case kInterface: 4234 resolved = klass->FindInterfaceMethod(dex_cache.get(), method_idx); 4235 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4236 break; 4237 case kSuper: // Fall-through. 4238 case kVirtual: 4239 resolved = klass->FindVirtualMethod(dex_cache.get(), method_idx); 4240 break; 4241 default: 4242 LOG(FATAL) << "Unreachable - invocation type: " << type; 4243 } 4244 if (resolved == NULL) { 4245 // Search by name, which works across dex files. 4246 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4247 const Signature signature = dex_file.GetMethodSignature(method_id); 4248 switch (type) { 4249 case kDirect: // Fall-through. 4250 case kStatic: 4251 resolved = klass->FindDirectMethod(name, signature); 4252 break; 4253 case kInterface: 4254 resolved = klass->FindInterfaceMethod(name, signature); 4255 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4256 break; 4257 case kSuper: // Fall-through. 4258 case kVirtual: 4259 resolved = klass->FindVirtualMethod(name, signature); 4260 break; 4261 } 4262 } 4263 if (resolved != NULL) { 4264 // We found a method, check for incompatible class changes. 4265 if (resolved->CheckIncompatibleClassChange(type)) { 4266 resolved = NULL; 4267 } 4268 } 4269 if (resolved != NULL) { 4270 // Be a good citizen and update the dex cache to speed subsequent calls. 4271 dex_cache->SetResolvedMethod(method_idx, resolved); 4272 return resolved; 4273 } else { 4274 // We failed to find the method which means either an access error, an incompatible class 4275 // change, or no such method. First try to find the method among direct and virtual methods. 4276 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4277 const Signature signature = dex_file.GetMethodSignature(method_id); 4278 switch (type) { 4279 case kDirect: 4280 case kStatic: 4281 resolved = klass->FindVirtualMethod(name, signature); 4282 break; 4283 case kInterface: 4284 case kVirtual: 4285 case kSuper: 4286 resolved = klass->FindDirectMethod(name, signature); 4287 break; 4288 } 4289 4290 // If we found something, check that it can be accessed by the referrer. 4291 if (resolved != NULL && referrer != NULL) { 4292 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4293 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4294 if (!referring_class->CanAccess(methods_class)) { 4295 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4296 resolved, type); 4297 return NULL; 4298 } else if (!referring_class->CanAccessMember(methods_class, 4299 resolved->GetAccessFlags())) { 4300 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4301 return NULL; 4302 } 4303 } 4304 4305 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4306 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4307 switch (type) { 4308 case kDirect: 4309 case kStatic: 4310 if (resolved != NULL) { 4311 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4312 } else { 4313 resolved = klass->FindInterfaceMethod(name, signature); 4314 if (resolved != NULL) { 4315 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4316 } else { 4317 ThrowNoSuchMethodError(type, klass, name, signature); 4318 } 4319 } 4320 break; 4321 case kInterface: 4322 if (resolved != NULL) { 4323 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4324 } else { 4325 resolved = klass->FindVirtualMethod(name, signature); 4326 if (resolved != NULL) { 4327 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer); 4328 } else { 4329 ThrowNoSuchMethodError(type, klass, name, signature); 4330 } 4331 } 4332 break; 4333 case kSuper: 4334 ThrowNoSuchMethodError(type, klass, name, signature); 4335 break; 4336 case kVirtual: 4337 if (resolved != NULL) { 4338 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer); 4339 } else { 4340 resolved = klass->FindInterfaceMethod(name, signature); 4341 if (resolved != NULL) { 4342 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer); 4343 } else { 4344 ThrowNoSuchMethodError(type, klass, name, signature); 4345 } 4346 } 4347 break; 4348 } 4349 DCHECK(Thread::Current()->IsExceptionPending()); 4350 return NULL; 4351 } 4352} 4353 4354mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4355 const SirtRef<mirror::DexCache>& dex_cache, 4356 const SirtRef<mirror::ClassLoader>& class_loader, 4357 bool is_static) { 4358 DCHECK(dex_cache.get() != nullptr); 4359 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4360 if (resolved != NULL) { 4361 return resolved; 4362 } 4363 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4364 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4365 if (klass == NULL) { 4366 DCHECK(Thread::Current()->IsExceptionPending()); 4367 return NULL; 4368 } 4369 4370 if (is_static) { 4371 resolved = klass->FindStaticField(dex_cache.get(), field_idx); 4372 } else { 4373 resolved = klass->FindInstanceField(dex_cache.get(), field_idx); 4374 } 4375 4376 if (resolved == NULL) { 4377 const char* name = dex_file.GetFieldName(field_id); 4378 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4379 if (is_static) { 4380 resolved = klass->FindStaticField(name, type); 4381 } else { 4382 resolved = klass->FindInstanceField(name, type); 4383 } 4384 if (resolved == NULL) { 4385 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass, type, name); 4386 return NULL; 4387 } 4388 } 4389 dex_cache->SetResolvedField(field_idx, resolved); 4390 return resolved; 4391} 4392 4393mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4394 uint32_t field_idx, 4395 const SirtRef<mirror::DexCache>& dex_cache, 4396 const SirtRef<mirror::ClassLoader>& class_loader) { 4397 DCHECK(dex_cache.get() != nullptr); 4398 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4399 if (resolved != NULL) { 4400 return resolved; 4401 } 4402 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4403 mirror::Class* klass = ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader); 4404 if (klass == NULL) { 4405 DCHECK(Thread::Current()->IsExceptionPending()); 4406 return NULL; 4407 } 4408 4409 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4410 StringPiece type(dex_file.StringDataByIdx( 4411 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4412 resolved = klass->FindField(name, type); 4413 if (resolved != NULL) { 4414 dex_cache->SetResolvedField(field_idx, resolved); 4415 } else { 4416 ThrowNoSuchFieldError("", klass, type, name); 4417 } 4418 return resolved; 4419} 4420 4421const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4422 uint32_t* length) { 4423 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4424 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4425 const DexFile& dex_file = *dex_cache->GetDexFile(); 4426 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4427 return dex_file.GetMethodShorty(method_id, length); 4428} 4429 4430void ClassLinker::DumpAllClasses(int flags) { 4431 if (dex_cache_image_class_lookup_required_) { 4432 MoveImageClassesToClassTable(); 4433 } 4434 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4435 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4436 std::vector<mirror::Class*> all_classes; 4437 { 4438 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4439 for (const std::pair<size_t, mirror::Class*>& it : class_table_) { 4440 all_classes.push_back(it.second); 4441 } 4442 } 4443 4444 for (size_t i = 0; i < all_classes.size(); ++i) { 4445 all_classes[i]->DumpClass(std::cerr, flags); 4446 } 4447} 4448 4449void ClassLinker::DumpForSigQuit(std::ostream& os) { 4450 if (dex_cache_image_class_lookup_required_) { 4451 MoveImageClassesToClassTable(); 4452 } 4453 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4454 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4455} 4456 4457size_t ClassLinker::NumLoadedClasses() { 4458 if (dex_cache_image_class_lookup_required_) { 4459 MoveImageClassesToClassTable(); 4460 } 4461 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4462 return class_table_.size(); 4463} 4464 4465pid_t ClassLinker::GetClassesLockOwner() { 4466 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4467} 4468 4469pid_t ClassLinker::GetDexLockOwner() { 4470 return dex_lock_.GetExclusiveOwnerTid(); 4471} 4472 4473void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4474 DCHECK(!init_done_); 4475 4476 DCHECK(klass != NULL); 4477 DCHECK(klass->GetClassLoader() == NULL); 4478 4479 DCHECK(class_roots_ != NULL); 4480 DCHECK(class_roots_->Get(class_root) == NULL); 4481 class_roots_->Set<false>(class_root, klass); 4482} 4483 4484} // namespace art 4485