class_linker.cc revision 0fbd6e6ec3241b7163b95f9f001bfe9b08f8b200
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <fcntl.h> 20#include <sys/file.h> 21#include <sys/stat.h> 22#include <deque> 23#include <memory> 24#include <string> 25#include <utility> 26#include <vector> 27 28#include "base/casts.h" 29#include "base/logging.h" 30#include "base/scoped_flock.h" 31#include "base/stl_util.h" 32#include "base/unix_file/fd_file.h" 33#include "class_linker-inl.h" 34#include "compiler_callbacks.h" 35#include "debugger.h" 36#include "dex_file-inl.h" 37#include "gc/accounting/card_table-inl.h" 38#include "gc/accounting/heap_bitmap.h" 39#include "gc/heap.h" 40#include "gc/space/image_space.h" 41#include "handle_scope.h" 42#include "intern_table.h" 43#include "interpreter/interpreter.h" 44#include "leb128.h" 45#include "oat.h" 46#include "oat_file.h" 47#include "mirror/art_field-inl.h" 48#include "mirror/art_method-inl.h" 49#include "mirror/class.h" 50#include "mirror/class-inl.h" 51#include "mirror/class_loader.h" 52#include "mirror/dex_cache-inl.h" 53#include "mirror/iftable-inl.h" 54#include "mirror/object-inl.h" 55#include "mirror/object_array-inl.h" 56#include "mirror/proxy.h" 57#include "mirror/stack_trace_element.h" 58#include "mirror/string-inl.h" 59#include "object_utils.h" 60#include "os.h" 61#include "runtime.h" 62#include "entrypoints/entrypoint_utils.h" 63#include "ScopedLocalRef.h" 64#include "scoped_thread_state_change.h" 65#include "handle_scope-inl.h" 66#include "thread.h" 67#include "utils.h" 68#include "verifier/method_verifier.h" 69#include "well_known_classes.h" 70 71namespace art { 72 73static void ThrowNoClassDefFoundError(const char* fmt, ...) 74 __attribute__((__format__(__printf__, 1, 2))) 75 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 76static void ThrowNoClassDefFoundError(const char* fmt, ...) { 77 va_list args; 78 va_start(args, fmt); 79 Thread* self = Thread::Current(); 80 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 81 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 82 va_end(args); 83} 84 85static void ThrowEarlierClassFailure(mirror::Class* c) 86 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 87 // The class failed to initialize on a previous attempt, so we want to throw 88 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 89 // failed in verification, in which case v2 5.4.1 says we need to re-throw 90 // the previous error. 91 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 92 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 93 } 94 95 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 96 Thread* self = Thread::Current(); 97 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 98 if (c->GetVerifyErrorClass() != NULL) { 99 // TODO: change the verifier to store an _instance_, with a useful detail message? 100 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor().c_str(), 101 PrettyDescriptor(c).c_str()); 102 } else { 103 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 104 PrettyDescriptor(c).c_str()); 105 } 106} 107 108static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 109 Thread* self = Thread::Current(); 110 JNIEnv* env = self->GetJniEnv(); 111 112 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 113 CHECK(cause.get() != NULL); 114 115 env->ExceptionClear(); 116 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 117 env->Throw(cause.get()); 118 119 // We only wrap non-Error exceptions; an Error can just be used as-is. 120 if (!is_error) { 121 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 122 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 123 } 124} 125 126static size_t Hash(const char* s) { 127 // This is the java.lang.String hashcode for convenience, not interoperability. 128 size_t hash = 0; 129 for (; *s != '\0'; ++s) { 130 hash = hash * 31 + *s; 131 } 132 return hash; 133} 134 135const char* ClassLinker::class_roots_descriptors_[] = { 136 "Ljava/lang/Class;", 137 "Ljava/lang/Object;", 138 "[Ljava/lang/Class;", 139 "[Ljava/lang/Object;", 140 "Ljava/lang/String;", 141 "Ljava/lang/DexCache;", 142 "Ljava/lang/ref/Reference;", 143 "Ljava/lang/reflect/ArtField;", 144 "Ljava/lang/reflect/ArtMethod;", 145 "Ljava/lang/reflect/Proxy;", 146 "[Ljava/lang/String;", 147 "[Ljava/lang/reflect/ArtField;", 148 "[Ljava/lang/reflect/ArtMethod;", 149 "Ljava/lang/ClassLoader;", 150 "Ljava/lang/Throwable;", 151 "Ljava/lang/ClassNotFoundException;", 152 "Ljava/lang/StackTraceElement;", 153 "Z", 154 "B", 155 "C", 156 "D", 157 "F", 158 "I", 159 "J", 160 "S", 161 "V", 162 "[Z", 163 "[B", 164 "[C", 165 "[D", 166 "[F", 167 "[I", 168 "[J", 169 "[S", 170 "[Ljava/lang/StackTraceElement;", 171}; 172 173ClassLinker::ClassLinker(InternTable* intern_table) 174 // dex_lock_ is recursive as it may be used in stack dumping. 175 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 176 dex_cache_image_class_lookup_required_(false), 177 failed_dex_cache_class_lookups_(0), 178 class_roots_(nullptr), 179 array_iftable_(nullptr), 180 find_array_class_cache_next_victim_(0), 181 init_done_(false), 182 log_new_dex_caches_roots_(false), 183 log_new_class_table_roots_(false), 184 intern_table_(intern_table), 185 portable_resolution_trampoline_(nullptr), 186 quick_resolution_trampoline_(nullptr), 187 portable_imt_conflict_trampoline_(nullptr), 188 quick_imt_conflict_trampoline_(nullptr), 189 quick_generic_jni_trampoline_(nullptr), 190 quick_to_interpreter_bridge_trampoline_(nullptr) { 191 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 192 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 193} 194 195// To set a value for generic JNI. May be necessary in compiler tests. 196extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 197 198void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 199 VLOG(startup) << "ClassLinker::Init"; 200 CHECK(Runtime::Current()->IsCompiler()); 201 202 CHECK(!init_done_); 203 204 // java_lang_Class comes first, it's needed for AllocClass 205 Thread* self = Thread::Current(); 206 gc::Heap* heap = Runtime::Current()->GetHeap(); 207 // The GC can't handle an object with a null class since we can't get the size of this object. 208 heap->IncrementDisableMovingGC(self); 209 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 210 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 211 heap->AllocNonMovableObject<true>(self, nullptr, 212 mirror::Class::ClassClassSize(), 213 VoidFunctor())))); 214 CHECK(java_lang_Class.Get() != NULL); 215 mirror::Class::SetClassClass(java_lang_Class.Get()); 216 java_lang_Class->SetClass(java_lang_Class.Get()); 217 if (kUseBakerOrBrooksReadBarrier) { 218 java_lang_Class->AssertReadBarrierPointer(); 219 } 220 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 221 heap->DecrementDisableMovingGC(self); 222 // AllocClass(mirror::Class*) can now be used 223 224 // Class[] is used for reflection support. 225 Handle<mirror::Class> class_array_class(hs.NewHandle( 226 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 227 class_array_class->SetComponentType(java_lang_Class.Get()); 228 229 // java_lang_Object comes next so that object_array_class can be created. 230 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 231 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 232 CHECK(java_lang_Object.Get() != NULL); 233 // backfill Object as the super class of Class. 234 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 235 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 236 237 // Object[] next to hold class roots. 238 Handle<mirror::Class> object_array_class(hs.NewHandle( 239 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 240 object_array_class->SetComponentType(java_lang_Object.Get()); 241 242 // Setup the char (primitive) class to be used for char[]. 243 Handle<mirror::Class> char_class(hs.NewHandle( 244 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 245 246 // Setup the char[] class to be used for String. 247 Handle<mirror::Class> char_array_class(hs.NewHandle( 248 AllocClass(self, java_lang_Class.Get(), 249 mirror::Array::ClassSize()))); 250 char_array_class->SetComponentType(char_class.Get()); 251 mirror::CharArray::SetArrayClass(char_array_class.Get()); 252 253 // Setup String. 254 Handle<mirror::Class> java_lang_String(hs.NewHandle( 255 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 256 mirror::String::SetClass(java_lang_String.Get()); 257 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 258 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 259 260 // Create storage for root classes, save away our work so far (requires descriptors). 261 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 262 kClassRootsMax); 263 CHECK(class_roots_ != NULL); 264 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 265 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 266 SetClassRoot(kClassArrayClass, class_array_class.Get()); 267 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 268 SetClassRoot(kCharArrayClass, char_array_class.Get()); 269 SetClassRoot(kJavaLangString, java_lang_String.Get()); 270 271 // Setup the primitive type classes. 272 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 273 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 274 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 275 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 276 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 277 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 278 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 279 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 280 281 // Create array interface entries to populate once we can load system classes. 282 array_iftable_ = AllocIfTable(self, 2); 283 284 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 285 Handle<mirror::Class> int_array_class(hs.NewHandle( 286 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 287 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 288 mirror::IntArray::SetArrayClass(int_array_class.Get()); 289 SetClassRoot(kIntArrayClass, int_array_class.Get()); 290 291 // now that these are registered, we can use AllocClass() and AllocObjectArray 292 293 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 294 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 295 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 296 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 297 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 298 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 299 300 // Constructor, Field, Method, and AbstractMethod are necessary so 301 // that FindClass can link members. 302 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 303 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 304 CHECK(java_lang_reflect_ArtField.Get() != NULL); 305 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 306 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 307 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 308 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 309 310 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 311 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 312 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 313 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 314 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 315 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 316 317 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 318 319 // Set up array classes for string, field, method 320 Handle<mirror::Class> object_array_string(hs.NewHandle( 321 AllocClass(self, java_lang_Class.Get(), 322 mirror::ObjectArray<mirror::String>::ClassSize()))); 323 object_array_string->SetComponentType(java_lang_String.Get()); 324 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 325 326 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 327 AllocClass(self, java_lang_Class.Get(), 328 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 329 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 330 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 331 332 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 333 AllocClass(self, java_lang_Class.Get(), 334 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 335 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 336 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 337 338 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 339 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 340 // these roots. 341 CHECK_NE(0U, boot_class_path.size()); 342 for (size_t i = 0; i != boot_class_path.size(); ++i) { 343 const DexFile* dex_file = boot_class_path[i]; 344 CHECK(dex_file != NULL); 345 AppendToBootClassPath(*dex_file); 346 } 347 348 // now we can use FindSystemClass 349 350 // run char class through InitializePrimitiveClass to finish init 351 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 352 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 353 354 // Create runtime resolution and imt conflict methods. Also setup the default imt. 355 Runtime* runtime = Runtime::Current(); 356 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 357 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 358 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 359 360 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 361 // we do not need friend classes or a publicly exposed setter. 362 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 363 364 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 365 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 366 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 367 CHECK_EQ(java_lang_Object.Get(), Object_class); 368 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 369 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 370 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 371 std::ostringstream os1, os2; 372 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 373 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 374 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 375 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 376 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 377 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 378 CHECK_EQ(java_lang_String.Get(), String_class); 379 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 380 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 381 382 // Setup the primitive array type classes - can't be done until Object has a vtable. 383 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 384 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 385 386 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 387 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 388 389 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 390 CHECK_EQ(char_array_class.Get(), found_char_array_class); 391 392 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 393 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 394 395 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 396 CHECK_EQ(int_array_class.Get(), found_int_array_class); 397 398 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 399 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 400 401 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 402 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 403 404 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 405 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 406 407 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 408 CHECK_EQ(class_array_class.Get(), found_class_array_class); 409 410 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 411 CHECK_EQ(object_array_class.Get(), found_object_array_class); 412 413 // Setup the single, global copy of "iftable". 414 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 415 CHECK(java_lang_Cloneable != NULL); 416 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 417 CHECK(java_io_Serializable != NULL); 418 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 419 // crawl up and explicitly list all of the supers as well. 420 { 421 mirror::IfTable* array_iftable = 422 ReadBarrier::BarrierForRoot<mirror::IfTable, kWithReadBarrier>(&array_iftable_); 423 array_iftable->SetInterface(0, java_lang_Cloneable); 424 array_iftable->SetInterface(1, java_io_Serializable); 425 } 426 427 // Sanity check Class[] and Object[]'s interfaces. 428 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 429 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 430 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 431 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 432 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 433 // dex_cache_ fields and register them in class_table_. 434 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 435 CHECK_EQ(java_lang_Class.Get(), Class_class); 436 437 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 438 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 439 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 440 441 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 442 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 443 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 444 445 mirror::Class* String_array_class = 446 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 447 CHECK_EQ(object_array_string.Get(), String_array_class); 448 449 mirror::Class* Art_method_array_class = 450 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 451 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 452 453 mirror::Class* Art_field_array_class = 454 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 455 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 456 457 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 458 459 // Create java.lang.reflect.Proxy root. 460 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 461 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 462 463 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 464 mirror::Class* java_lang_ref_Reference = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 465 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference); 466 mirror::Class* java_lang_ref_FinalizerReference = 467 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 468 java_lang_ref_FinalizerReference->SetAccessFlags( 469 java_lang_ref_FinalizerReference->GetAccessFlags() | 470 kAccClassIsReference | kAccClassIsFinalizerReference); 471 mirror::Class* java_lang_ref_PhantomReference = 472 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 473 java_lang_ref_PhantomReference->SetAccessFlags( 474 java_lang_ref_PhantomReference->GetAccessFlags() | 475 kAccClassIsReference | kAccClassIsPhantomReference); 476 mirror::Class* java_lang_ref_SoftReference = 477 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 478 java_lang_ref_SoftReference->SetAccessFlags( 479 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 480 mirror::Class* java_lang_ref_WeakReference = 481 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 482 java_lang_ref_WeakReference->SetAccessFlags( 483 java_lang_ref_WeakReference->GetAccessFlags() | 484 kAccClassIsReference | kAccClassIsWeakReference); 485 486 // Setup the ClassLoader, verifying the object_size_. 487 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 488 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 489 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 490 491 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 492 // java.lang.StackTraceElement as a convenience. 493 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 494 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 495 SetClassRoot(kJavaLangClassNotFoundException, 496 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 497 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 498 SetClassRoot(kJavaLangStackTraceElementArrayClass, 499 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 500 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 501 502 FinishInit(self); 503 504 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 505} 506 507void ClassLinker::FinishInit(Thread* self) { 508 VLOG(startup) << "ClassLinker::FinishInit entering"; 509 510 // Let the heap know some key offsets into java.lang.ref instances 511 // Note: we hard code the field indexes here rather than using FindInstanceField 512 // as the types of the field can't be resolved prior to the runtime being 513 // fully initialized 514 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 515 mirror::Class* java_lang_ref_FinalizerReference = 516 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 517 518 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 519 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 520 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 521 522 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 523 CHECK_STREQ(queue->GetName(), "queue"); 524 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 525 526 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 527 CHECK_STREQ(queueNext->GetName(), "queueNext"); 528 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 529 530 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 531 CHECK_STREQ(referent->GetName(), "referent"); 532 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 533 534 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 535 CHECK_STREQ(zombie->GetName(), "zombie"); 536 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 537 538 // ensure all class_roots_ are initialized 539 for (size_t i = 0; i < kClassRootsMax; i++) { 540 ClassRoot class_root = static_cast<ClassRoot>(i); 541 mirror::Class* klass = GetClassRoot(class_root); 542 CHECK(klass != NULL); 543 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 544 // note SetClassRoot does additional validation. 545 // if possible add new checks there to catch errors early 546 } 547 548 CHECK(array_iftable_ != NULL); 549 550 // disable the slow paths in FindClass and CreatePrimitiveClass now 551 // that Object, Class, and Object[] are setup 552 init_done_ = true; 553 554 VLOG(startup) << "ClassLinker::FinishInit exiting"; 555} 556 557void ClassLinker::RunRootClinits() { 558 Thread* self = Thread::Current(); 559 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 560 mirror::Class* c = GetClassRoot(ClassRoot(i)); 561 if (!c->IsArrayClass() && !c->IsPrimitive()) { 562 StackHandleScope<1> hs(self); 563 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 564 EnsureInitialized(h_class, true, true); 565 self->AssertNoPendingException(); 566 } 567 } 568} 569 570bool ClassLinker::GenerateOatFile(const char* dex_filename, 571 int oat_fd, 572 const char* oat_cache_filename, 573 std::string* error_msg) { 574 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 575 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 576 577 gc::Heap* heap = Runtime::Current()->GetHeap(); 578 std::string boot_image_option("--boot-image="); 579 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 580 581 std::string dex_file_option("--dex-file="); 582 dex_file_option += dex_filename; 583 584 std::string oat_fd_option("--oat-fd="); 585 StringAppendF(&oat_fd_option, "%d", oat_fd); 586 587 std::string oat_location_option("--oat-location="); 588 oat_location_option += oat_cache_filename; 589 590 std::vector<std::string> argv; 591 argv.push_back(dex2oat); 592 argv.push_back("--runtime-arg"); 593 argv.push_back("-classpath"); 594 argv.push_back("--runtime-arg"); 595 argv.push_back(Runtime::Current()->GetClassPathString()); 596 597 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 598 599 if (!Runtime::Current()->IsVerificationEnabled()) { 600 argv.push_back("--compiler-filter=verify-none"); 601 } 602 603 if (!kIsTargetBuild) { 604 argv.push_back("--host"); 605 } 606 607 argv.push_back(boot_image_option); 608 argv.push_back(dex_file_option); 609 argv.push_back(oat_fd_option); 610 argv.push_back(oat_location_option); 611 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 612 for (size_t i = 0; i < compiler_options.size(); ++i) { 613 argv.push_back(compiler_options[i].c_str()); 614 } 615 616 return Exec(argv, error_msg); 617} 618 619const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 620 WriterMutexLock mu(Thread::Current(), dex_lock_); 621 if (kIsDebugBuild) { 622 for (size_t i = 0; i < oat_files_.size(); ++i) { 623 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 624 } 625 } 626 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 627 oat_files_.push_back(oat_file); 628 return oat_file; 629} 630 631OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 632 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 633 OatFile* oat_file = space->ReleaseOatFile(); 634 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 635 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 636 return *oat_file; 637} 638 639const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 640 const char* dex_location = dex_file.GetLocation().c_str(); 641 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 642 return FindOpenedOatFile(nullptr, dex_location, &dex_location_checksum); 643} 644 645const OatFile* ClassLinker::FindOpenedOatFile(const char* oat_location, const char* dex_location, 646 const uint32_t* const dex_location_checksum) { 647 ReaderMutexLock mu(Thread::Current(), dex_lock_); 648 for (size_t i = 0; i < oat_files_.size(); i++) { 649 const OatFile* oat_file = oat_files_[i]; 650 DCHECK(oat_file != NULL); 651 652 if (oat_location != nullptr) { 653 if (oat_file->GetLocation() != oat_location) { 654 continue; 655 } 656 } 657 658 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 659 dex_location_checksum, 660 false); 661 if (oat_dex_file != NULL) { 662 return oat_file; 663 } 664 } 665 return NULL; 666} 667 668static std::string GetMultiDexClassesDexName(size_t number, const char* dex_location) { 669 if (number == 0) { 670 return dex_location; 671 } else { 672 return StringPrintf("%s" kMultiDexSeparatorString "classes%zu.dex", dex_location, number + 1); 673 } 674} 675 676static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, const char* dex_location, 677 bool generated, 678 std::vector<std::string>* error_msgs, 679 std::vector<const DexFile*>* dex_files) { 680 if (oat_file == nullptr) { 681 return false; 682 } 683 684 size_t old_size = dex_files->size(); // To rollback on error. 685 686 bool success = true; 687 for (size_t i = 0; success; ++i) { 688 std::string next_name_str = GetMultiDexClassesDexName(i, dex_location); 689 const char* next_name = next_name_str.c_str(); 690 691 uint32_t dex_location_checksum; 692 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 693 std::string error_msg; 694 if (!DexFile::GetChecksum(next_name, dex_location_checksum_pointer, &error_msg)) { 695 DCHECK_EQ(false, i == 0 && generated); 696 dex_location_checksum_pointer = nullptr; 697 } 698 699 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 700 701 if (oat_dex_file == nullptr) { 702 if (i == 0 && generated) { 703 std::string error_msg; 704 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 705 " file'%s'", dex_location, dex_location_checksum, 706 oat_file->GetLocation().c_str()); 707 error_msgs->push_back(error_msg); 708 } 709 break; // Not found, done. 710 } 711 712 // Checksum test. Test must succeed when generated. 713 success = !generated; 714 if (dex_location_checksum_pointer != nullptr) { 715 success = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 716 } 717 718 if (success) { 719 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 720 if (dex_file == nullptr) { 721 success = false; 722 error_msgs->push_back(error_msg); 723 } else { 724 dex_files->push_back(dex_file); 725 } 726 } 727 728 // When we generated the file, we expect success, or something is terribly wrong. 729 CHECK_EQ(false, generated && !success) 730 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 731 << std::hex << " dex_location_checksum=" << dex_location_checksum 732 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 733 } 734 735 if (dex_files->size() == old_size) { 736 success = false; // We did not even find classes.dex 737 } 738 739 if (success) { 740 return true; 741 } else { 742 // Free all the dex files we have loaded. 743 auto it = dex_files->begin() + old_size; 744 auto it_end = dex_files->end(); 745 for (; it != it_end; it++) { 746 delete *it; 747 } 748 dex_files->erase(dex_files->begin() + old_size, it_end); 749 750 return false; 751 } 752} 753 754// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 755// complicates the loading process, as we should not use an iterative loading process, because that 756// would register the oat file and dex files that come before the broken one. Instead, check all 757// multidex ahead of time. 758bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 759 std::vector<std::string>* error_msgs, 760 std::vector<const DexFile*>* dex_files) { 761 // 1) Check whether we have an open oat file. 762 // This requires a dex checksum, use the "primary" one. 763 uint32_t dex_location_checksum; 764 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 765 bool have_checksum = true; 766 std::string checksum_error_msg; 767 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 768 dex_location_checksum_pointer = nullptr; 769 have_checksum = false; 770 } 771 772 bool needs_registering = false; 773 774 std::unique_ptr<const OatFile> open_oat_file(FindOpenedOatFile(oat_location, dex_location, 775 dex_location_checksum_pointer)); 776 777 // 2) If we do not have an open one, maybe there's one on disk already. 778 779 // In case the oat file is not open, we play a locking game here so 780 // that if two different processes race to load and register or generate 781 // (or worse, one tries to open a partial generated file) we will be okay. 782 // This is actually common with apps that use DexClassLoader to work 783 // around the dex method reference limit and that have a background 784 // service running in a separate process. 785 ScopedFlock scoped_flock; 786 787 if (open_oat_file.get() == nullptr) { 788 if (oat_location != nullptr) { 789 // Can only do this if we have a checksum, else error. 790 if (!have_checksum) { 791 error_msgs->push_back(checksum_error_msg); 792 return false; 793 } 794 795 std::string error_msg; 796 797 // We are loading or creating one in the future. Time to set up the file lock. 798 if (!scoped_flock.Init(oat_location, &error_msg)) { 799 error_msgs->push_back(error_msg); 800 return false; 801 } 802 803 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 804 oat_location, &error_msg)); 805 806 if (open_oat_file.get() == nullptr) { 807 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 808 dex_location, oat_location, error_msg.c_str()); 809 VLOG(class_linker) << compound_msg; 810 error_msgs->push_back(compound_msg); 811 } 812 } else { 813 // TODO: What to lock here? 814 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 815 dex_location_checksum_pointer, 816 kRuntimeISA, error_msgs)); 817 } 818 needs_registering = true; 819 } 820 821 // 3) If we have an oat file, check all contained multidex files for our dex_location. 822 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 823 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, false, error_msgs, 824 dex_files); 825 if (success) { 826 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 827 if (needs_registering) { 828 // We opened the oat file, so we must register it. 829 RegisterOatFile(oat_file); 830 } 831 return true; 832 } else { 833 if (needs_registering) { 834 // We opened it, delete it. 835 open_oat_file.reset(); 836 } else { 837 open_oat_file.release(); // Do not delete open oat files. 838 } 839 } 840 841 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 842 843 // Need a checksum, fail else. 844 if (!have_checksum) { 845 error_msgs->push_back(checksum_error_msg); 846 return false; 847 } 848 849 // Look in cache location if no oat_location is given. 850 std::string cache_location; 851 if (oat_location == nullptr) { 852 // Use the dalvik cache. 853 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 854 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 855 oat_location = cache_location.c_str(); 856 } 857 858 // Definitely need to lock now. 859 if (!scoped_flock.HasFile()) { 860 std::string error_msg; 861 if (!scoped_flock.Init(oat_location, &error_msg)) { 862 error_msgs->push_back(error_msg); 863 return false; 864 } 865 } 866 867 // Create the oat file. 868 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 869 oat_location, error_msgs)); 870 871 // Failed, bail. 872 if (open_oat_file.get() == nullptr) { 873 return false; 874 } 875 876 // Try to load again, but stronger checks. 877 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, true, error_msgs, 878 dex_files); 879 if (success) { 880 RegisterOatFile(open_oat_file.release()); 881 return true; 882 } else { 883 return false; 884 } 885} 886 887const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 888 uint32_t dex_location_checksum, 889 const char* oat_location, 890 std::string* error_msg) { 891 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 892 !Runtime::Current()->IsCompiler(), 893 error_msg)); 894 if (oat_file.get() == nullptr) { 895 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 896 error_msg->c_str()); 897 return nullptr; 898 } 899 Runtime* runtime = Runtime::Current(); 900 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 901 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 902 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 903 if (expected_image_oat_checksum != actual_image_oat_checksum) { 904 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 905 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 906 actual_image_oat_checksum); 907 return nullptr; 908 } 909 910 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 911 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 912 if (expected_image_oat_offset != actual_image_oat_offset) { 913 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 914 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 915 actual_image_oat_offset); 916 return nullptr; 917 } 918 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 919 &dex_location_checksum); 920 if (oat_dex_file == nullptr) { 921 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 922 dex_location); 923 return nullptr; 924 } 925 uint32_t expected_dex_checksum = dex_location_checksum; 926 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 927 if (expected_dex_checksum != actual_dex_checksum) { 928 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 929 "found 0x%x", oat_location, expected_dex_checksum, 930 actual_dex_checksum); 931 return nullptr; 932 } 933 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 934 if (dex_file.get() != nullptr) { 935 return oat_file.release(); 936 } else { 937 return nullptr; 938 } 939} 940 941const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 942 int fd, const char* oat_location, 943 std::vector<std::string>* error_msgs) { 944 // Generate the output oat file for the dex file 945 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 946 std::string error_msg; 947 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 948 CHECK(!error_msg.empty()); 949 error_msgs->push_back(error_msg); 950 return nullptr; 951 } 952 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 953 !Runtime::Current()->IsCompiler(), 954 &error_msg)); 955 if (oat_file.get() == nullptr) { 956 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 957 oat_location, error_msg.c_str()); 958 error_msgs->push_back(compound_msg); 959 return nullptr; 960 } 961 962 return oat_file.release(); 963} 964 965bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 966 const char* dex_location, 967 uint32_t dex_location_checksum, 968 const InstructionSet instruction_set, 969 std::string* error_msg) { 970 Runtime* runtime = Runtime::Current(); 971 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 972 973 // If the requested instruction set is the same as the current runtime, 974 // we can use the checksums directly. If it isn't, we'll have to read the 975 // image header from the image for the right instruction set. 976 uint32_t image_oat_checksum = 0; 977 uintptr_t image_oat_data_begin = 0; 978 if (instruction_set == kRuntimeISA) { 979 const ImageHeader& image_header = image_space->GetImageHeader(); 980 image_oat_checksum = image_header.GetOatChecksum(); 981 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 982 } else { 983 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 984 image_space->GetImageLocation().c_str(), instruction_set)); 985 image_oat_checksum = image_header->GetOatChecksum(); 986 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 987 } 988 const OatHeader& oat_header = oat_file->GetOatHeader(); 989 bool image_check = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 990 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 991 992 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 993 &dex_location_checksum); 994 if (oat_dex_file == NULL) { 995 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 996 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 997 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 998 for (size_t i = 0; i < oat_dex_files.size(); i++) { 999 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 1000 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 1001 oat_file->GetLocation().c_str(), 1002 oat_dex_file->GetDexFileLocation().c_str()); 1003 } 1004 return false; 1005 } 1006 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 1007 1008 if (image_check && dex_check) { 1009 return true; 1010 } 1011 1012 if (!image_check) { 1013 ScopedObjectAccess soa(Thread::Current()); 1014 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with (0x%x, %" PRIdPTR ")", 1015 oat_file->GetLocation().c_str(), 1016 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1017 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1018 image_oat_checksum, image_oat_data_begin); 1019 } 1020 if (!dex_check) { 1021 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1022 oat_file->GetLocation().c_str(), 1023 oat_dex_file->GetDexFileLocationChecksum(), 1024 dex_location, dex_location_checksum); 1025 } 1026 return false; 1027} 1028 1029const OatFile* ClassLinker::LoadOatFileAndVerifyDexFile(const std::string& oat_file_location, 1030 const char* dex_location, 1031 std::string* error_msg, 1032 bool* open_failed) { 1033 std::unique_ptr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 1034 if (oat_file.get() == nullptr) { 1035 *open_failed = true; 1036 return nullptr; 1037 } 1038 *open_failed = false; 1039 std::unique_ptr<const DexFile> dex_file; 1040 uint32_t dex_location_checksum; 1041 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 1042 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1043 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1044 // directory. 1045 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1046 if (oat_dex_file == nullptr) { 1047 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1048 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 1049 error_msg->c_str()); 1050 return nullptr; 1051 } 1052 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1053 } else { 1054 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 1055 kRuntimeISA, error_msg); 1056 if (!verified) { 1057 return nullptr; 1058 } 1059 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1060 &dex_location_checksum)->OpenDexFile(error_msg)); 1061 } 1062 1063 if (dex_file.get() != nullptr) { 1064 return oat_file.release(); 1065 } else { 1066 return nullptr; 1067 } 1068} 1069 1070const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1071 const char* dex_location, 1072 const uint32_t* const dex_location_checksum, 1073 InstructionSet isa, 1074 std::vector<std::string>* error_msgs) { 1075 // Look for an existing file next to dex. for example, for 1076 // /foo/bar/baz.jar, look for /foo/bar/<isa>/baz.odex. 1077 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1078 bool open_failed; 1079 std::string error_msg; 1080 const OatFile* oat_file = LoadOatFileAndVerifyDexFile(odex_filename, dex_location, &error_msg, 1081 &open_failed); 1082 if (oat_file != nullptr) { 1083 return oat_file; 1084 } 1085 if (dex_location_checksum == nullptr) { 1086 error_msgs->push_back(StringPrintf("Failed to open oat file from %s and no classes.dex found in" 1087 "%s: %s", odex_filename.c_str(), dex_location, 1088 error_msg.c_str())); 1089 return nullptr; 1090 } 1091 1092 std::string cache_error_msg; 1093 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 1094 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location, 1095 dalvik_cache.c_str())); 1096 oat_file = LoadOatFileAndVerifyDexFile(cache_location, dex_location, &cache_error_msg, 1097 &open_failed); 1098 if (oat_file != nullptr) { 1099 return oat_file; 1100 } 1101 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 1102 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 1103 } 1104 std::string compound_msg = StringPrintf("Failed to open oat file from %s (error '%s') or %s " 1105 "(error '%s').", odex_filename.c_str(), error_msg.c_str(), 1106 cache_location.c_str(), cache_error_msg.c_str()); 1107 VLOG(class_linker) << compound_msg; 1108 error_msgs->push_back(compound_msg); 1109 1110 return nullptr; 1111} 1112 1113const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1114 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1115 for (size_t i = 0; i < oat_files_.size(); i++) { 1116 const OatFile* oat_file = oat_files_[i]; 1117 DCHECK(oat_file != nullptr); 1118 if (oat_file->GetLocation() == oat_location) { 1119 return oat_file; 1120 } 1121 } 1122 return nullptr; 1123} 1124 1125const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1126 std::string* error_msg) { 1127 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1128 if (oat_file != nullptr) { 1129 return oat_file; 1130 } 1131 1132 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1133 error_msg); 1134 if (oat_file == NULL) { 1135 return NULL; 1136 } 1137 return oat_file; 1138} 1139 1140static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1141 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1142 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1143 1144 DCHECK(obj != NULL); 1145 DCHECK(class_linker != NULL); 1146 1147 if (obj->IsArtMethod()) { 1148 mirror::ArtMethod* method = obj->AsArtMethod(); 1149 if (!method->IsNative()) { 1150 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1151 if (method != Runtime::Current()->GetResolutionMethod()) { 1152 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1153 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1154 } 1155 } 1156 } 1157} 1158 1159void ClassLinker::InitFromImage() { 1160 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1161 CHECK(!init_done_); 1162 1163 Thread* self = Thread::Current(); 1164 gc::Heap* heap = Runtime::Current()->GetHeap(); 1165 gc::space::ImageSpace* space = heap->GetImageSpace(); 1166 dex_cache_image_class_lookup_required_ = true; 1167 CHECK(space != NULL); 1168 OatFile& oat_file = GetImageOatFile(space); 1169 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1170 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1171 const char* image_file_location = oat_file.GetOatHeader(). 1172 GetStoreValueByKey(OatHeader::kImageLocationKey); 1173 CHECK(image_file_location == nullptr || *image_file_location == 0); 1174 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1175 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1176 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1177 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1178 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1179 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1180 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1181 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1182 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1183 1184 StackHandleScope<1> hs(self); 1185 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1186 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1187 AsObjectArray<mirror::Class>())); 1188 class_roots_ = class_roots.Get(); 1189 1190 // Special case of setting up the String class early so that we can test arbitrary objects 1191 // as being Strings or not 1192 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1193 1194 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1195 static_cast<uint32_t>(dex_caches->GetLength())); 1196 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1197 StackHandleScope<1> hs(self); 1198 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1199 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1200 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1201 nullptr); 1202 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1203 std::string error_msg; 1204 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1205 if (dex_file == NULL) { 1206 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1207 << " from within oat file " << oat_file.GetLocation() 1208 << " error '" << error_msg << "'"; 1209 } 1210 1211 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1212 1213 AppendToBootClassPath(*dex_file, dex_cache); 1214 } 1215 1216 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1217 // bitmap walk. 1218 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1219 1220 // Set entry point to interpreter if in InterpretOnly mode. 1221 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1222 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1223 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1224 } 1225 1226 // reinit class_roots_ 1227 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1228 class_roots_ = class_roots.Get(); 1229 1230 // reinit array_iftable_ from any array class instance, they should be == 1231 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1232 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1233 // String class root was set above 1234 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1235 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1236 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1237 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1238 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1239 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1240 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1241 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1242 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1243 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1244 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1245 1246 FinishInit(self); 1247 1248 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1249} 1250 1251void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1252 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1253 if ((flags & kVisitRootFlagAllRoots) != 0) { 1254 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1255 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1256 } 1257 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1258 for (auto& pair : new_class_roots_) { 1259 mirror::Object* old_ref = pair.second; 1260 callback(reinterpret_cast<mirror::Object**>(&pair.second), arg, 0, kRootStickyClass); 1261 if (UNLIKELY(pair.second != old_ref)) { 1262 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1263 // corresponding object. This is slow, but luckily for us, this may only happen with a 1264 // concurrent moving GC. 1265 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1266 it != end && it->first == pair.first; ++it) { 1267 // If the class stored matches the old class, update it to the new value. 1268 if (old_ref == it->second) { 1269 it->second = pair.second; 1270 } 1271 } 1272 } 1273 } 1274 } 1275 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1276 new_class_roots_.clear(); 1277 } 1278 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1279 log_new_class_table_roots_ = true; 1280 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1281 log_new_class_table_roots_ = false; 1282 } 1283 // We deliberately ignore the class roots in the image since we 1284 // handle image roots by using the MS/CMS rescanning of dirty cards. 1285} 1286 1287// Keep in sync with InitCallback. Anything we visit, we need to 1288// reinit references to when reinitializing a ClassLinker from a 1289// mapped image. 1290void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1291 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1292 Thread* self = Thread::Current(); 1293 { 1294 ReaderMutexLock mu(self, dex_lock_); 1295 if ((flags & kVisitRootFlagAllRoots) != 0) { 1296 for (mirror::DexCache*& dex_cache : dex_caches_) { 1297 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1298 } 1299 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1300 for (size_t index : new_dex_cache_roots_) { 1301 callback(reinterpret_cast<mirror::Object**>(&dex_caches_[index]), arg, 0, kRootVMInternal); 1302 } 1303 } 1304 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1305 new_dex_cache_roots_.clear(); 1306 } 1307 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1308 log_new_dex_caches_roots_ = true; 1309 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1310 log_new_dex_caches_roots_ = false; 1311 } 1312 } 1313 VisitClassRoots(callback, arg, flags); 1314 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1315 DCHECK(array_iftable_ != nullptr); 1316 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1317 if (find_array_class_cache_[i] != nullptr) { 1318 callback(reinterpret_cast<mirror::Object**>(&find_array_class_cache_[i]), arg, 0, 1319 kRootVMInternal); 1320 } 1321 } 1322} 1323 1324void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1325 if (dex_cache_image_class_lookup_required_) { 1326 MoveImageClassesToClassTable(); 1327 } 1328 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1329 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1330 mirror::Class** root = &it.second; 1331 mirror::Class* c = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 1332 if (!visitor(c, arg)) { 1333 return; 1334 } 1335 } 1336} 1337 1338static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1339 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1340 classes->insert(c); 1341 return true; 1342} 1343 1344void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1345 std::set<mirror::Class*> classes; 1346 VisitClasses(GetClassesVisitor, &classes); 1347 for (mirror::Class* klass : classes) { 1348 if (!visitor(klass, arg)) { 1349 return; 1350 } 1351 } 1352} 1353 1354ClassLinker::~ClassLinker() { 1355 mirror::Class::ResetClass(); 1356 mirror::String::ResetClass(); 1357 mirror::ArtField::ResetClass(); 1358 mirror::ArtMethod::ResetClass(); 1359 mirror::BooleanArray::ResetArrayClass(); 1360 mirror::ByteArray::ResetArrayClass(); 1361 mirror::CharArray::ResetArrayClass(); 1362 mirror::DoubleArray::ResetArrayClass(); 1363 mirror::FloatArray::ResetArrayClass(); 1364 mirror::IntArray::ResetArrayClass(); 1365 mirror::LongArray::ResetArrayClass(); 1366 mirror::ShortArray::ResetArrayClass(); 1367 mirror::Throwable::ResetClass(); 1368 mirror::StackTraceElement::ResetClass(); 1369 STLDeleteElements(&boot_class_path_); 1370 STLDeleteElements(&oat_files_); 1371} 1372 1373mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1374 gc::Heap* heap = Runtime::Current()->GetHeap(); 1375 StackHandleScope<16> hs(self); 1376 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1377 Handle<mirror::DexCache> dex_cache( 1378 hs.NewHandle(down_cast<mirror::DexCache*>( 1379 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1380 VoidFunctor())))); 1381 if (dex_cache.Get() == NULL) { 1382 return NULL; 1383 } 1384 Handle<mirror::String> 1385 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1386 if (location.Get() == NULL) { 1387 return NULL; 1388 } 1389 Handle<mirror::ObjectArray<mirror::String>> 1390 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1391 if (strings.Get() == NULL) { 1392 return NULL; 1393 } 1394 Handle<mirror::ObjectArray<mirror::Class>> 1395 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1396 if (types.Get() == NULL) { 1397 return NULL; 1398 } 1399 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1400 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1401 if (methods.Get() == NULL) { 1402 return NULL; 1403 } 1404 Handle<mirror::ObjectArray<mirror::ArtField>> 1405 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1406 if (fields.Get() == NULL) { 1407 return NULL; 1408 } 1409 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1410 fields.Get()); 1411 return dex_cache.Get(); 1412} 1413 1414mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1415 uint32_t class_size) { 1416 DCHECK_GE(class_size, sizeof(mirror::Class)); 1417 gc::Heap* heap = Runtime::Current()->GetHeap(); 1418 mirror::Class::InitializeClassVisitor visitor(class_size); 1419 mirror::Object* k = kMovingClasses ? 1420 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1421 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1422 if (UNLIKELY(k == nullptr)) { 1423 CHECK(self->IsExceptionPending()); // OOME. 1424 return nullptr; 1425 } 1426 return k->AsClass(); 1427} 1428 1429mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1430 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1431} 1432 1433mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1434 return down_cast<mirror::ArtField*>( 1435 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1436} 1437 1438mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1439 return down_cast<mirror::ArtMethod*>( 1440 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1441} 1442 1443mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1444 Thread* self, size_t length) { 1445 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1446 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1447} 1448 1449mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1450 mirror::Class* klass) { 1451 DCHECK(klass != NULL); 1452 1453 // For temporary classes we must wait for them to be retired. 1454 if (init_done_ && klass->IsTemp()) { 1455 CHECK(!klass->IsResolved()); 1456 if (klass->IsErroneous()) { 1457 ThrowEarlierClassFailure(klass); 1458 return nullptr; 1459 } 1460 StackHandleScope<1> hs(self); 1461 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1462 ObjectLock<mirror::Class> lock(self, h_class); 1463 // Loop and wait for the resolving thread to retire this class. 1464 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1465 lock.WaitIgnoringInterrupts(); 1466 } 1467 if (h_class->IsErroneous()) { 1468 ThrowEarlierClassFailure(h_class.Get()); 1469 return nullptr; 1470 } 1471 CHECK(h_class->IsRetired()); 1472 // Get the updated class from class table. 1473 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1474 } 1475 1476 // Wait for the class if it has not already been linked. 1477 if (!klass->IsResolved() && !klass->IsErroneous()) { 1478 StackHandleScope<1> hs(self); 1479 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1480 ObjectLock<mirror::Class> lock(self, h_class); 1481 // Check for circular dependencies between classes. 1482 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1483 ThrowClassCircularityError(h_class.Get()); 1484 h_class->SetStatus(mirror::Class::kStatusError, self); 1485 return nullptr; 1486 } 1487 // Wait for the pending initialization to complete. 1488 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1489 lock.WaitIgnoringInterrupts(); 1490 } 1491 } 1492 1493 if (klass->IsErroneous()) { 1494 ThrowEarlierClassFailure(klass); 1495 return nullptr; 1496 } 1497 // Return the loaded class. No exceptions should be pending. 1498 CHECK(klass->IsResolved()) << PrettyClass(klass); 1499 self->AssertNoPendingException(); 1500 return klass; 1501} 1502 1503mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1504 Handle<mirror::ClassLoader> class_loader) { 1505 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1506 DCHECK(self != nullptr); 1507 self->AssertNoPendingException(); 1508 if (descriptor[1] == '\0') { 1509 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1510 // for primitive classes that aren't backed by dex files. 1511 return FindPrimitiveClass(descriptor[0]); 1512 } 1513 // Find the class in the loaded classes table. 1514 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1515 if (klass != NULL) { 1516 return EnsureResolved(self, descriptor, klass); 1517 } 1518 // Class is not yet loaded. 1519 if (descriptor[0] == '[') { 1520 return CreateArrayClass(self, descriptor, class_loader); 1521 } else if (class_loader.Get() == nullptr) { 1522 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1523 if (pair.second != NULL) { 1524 StackHandleScope<1> hs(self); 1525 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1526 } 1527 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1528 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1529 // throw of a NoClassDefFoundError. 1530 if (IsInBootClassPath(descriptor)) { 1531 mirror::Class* system_class = FindSystemClass(self, descriptor); 1532 CHECK(system_class != NULL); 1533 return system_class; 1534 } 1535 // Next try the compile time class path. 1536 const std::vector<const DexFile*>* class_path; 1537 { 1538 ScopedObjectAccessUnchecked soa(self); 1539 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1540 soa.AddLocalReference<jobject>(class_loader.Get())); 1541 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1542 } 1543 1544 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1545 if (pair.second != NULL) { 1546 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1547 } 1548 1549 } else { 1550 ScopedObjectAccessUnchecked soa(self); 1551 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1552 soa.AddLocalReference<jobject>(class_loader.Get())); 1553 std::string class_name_string(DescriptorToDot(descriptor)); 1554 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1555 { 1556 ScopedThreadStateChange tsc(self, kNative); 1557 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1558 soa.Env()->NewStringUTF(class_name_string.c_str())); 1559 if (class_name_object.get() == NULL) { 1560 return NULL; 1561 } 1562 CHECK(class_loader_object.get() != NULL); 1563 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1564 WellKnownClasses::java_lang_ClassLoader_loadClass, 1565 class_name_object.get())); 1566 } 1567 if (self->IsExceptionPending()) { 1568 // If the ClassLoader threw, pass that exception up. 1569 return NULL; 1570 } else if (result.get() == NULL) { 1571 // broken loader - throw NPE to be compatible with Dalvik 1572 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1573 class_name_string.c_str()).c_str()); 1574 return NULL; 1575 } else { 1576 // success, return mirror::Class* 1577 return soa.Decode<mirror::Class*>(result.get()); 1578 } 1579 } 1580 1581 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1582 return NULL; 1583} 1584 1585mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1586 Handle<mirror::ClassLoader> class_loader, 1587 const DexFile& dex_file, 1588 const DexFile::ClassDef& dex_class_def) { 1589 Thread* self = Thread::Current(); 1590 StackHandleScope<3> hs(self); 1591 auto klass = hs.NewHandle<mirror::Class>(nullptr); 1592 bool should_allocate = false; 1593 1594 // Load the class from the dex file. 1595 if (UNLIKELY(!init_done_)) { 1596 // finish up init of hand crafted class_roots_ 1597 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1598 klass.Assign(GetClassRoot(kJavaLangObject)); 1599 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1600 klass.Assign(GetClassRoot(kJavaLangClass)); 1601 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1602 klass.Assign(GetClassRoot(kJavaLangString)); 1603 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1604 klass.Assign(GetClassRoot(kJavaLangDexCache)); 1605 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1606 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 1607 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1608 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 1609 } else { 1610 should_allocate = true; 1611 } 1612 } else { 1613 should_allocate = true; 1614 } 1615 1616 if (should_allocate) { 1617 // Allocate a class with the status of not ready. 1618 // Interface object should get the right size here. Regular class will 1619 // figure out the right size later and be replaced with one of the right 1620 // size when the class becomes resolved. 1621 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 1622 } 1623 if (UNLIKELY(klass.Get() == NULL)) { 1624 CHECK(self->IsExceptionPending()); // Expect an OOME. 1625 return NULL; 1626 } 1627 klass->SetDexCache(FindDexCache(dex_file)); 1628 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 1629 // Check for a pending exception during load 1630 if (self->IsExceptionPending()) { 1631 klass->SetStatus(mirror::Class::kStatusError, self); 1632 return NULL; 1633 } 1634 ObjectLock<mirror::Class> lock(self, klass); 1635 klass->SetClinitThreadId(self->GetTid()); 1636 1637 // Add the newly loaded class to the loaded classes table. 1638 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 1639 if (existing != NULL) { 1640 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1641 // this thread to block. 1642 return EnsureResolved(self, descriptor, existing); 1643 } 1644 1645 // Finish loading (if necessary) by finding parents 1646 CHECK(!klass->IsLoaded()); 1647 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1648 // Loading failed. 1649 klass->SetStatus(mirror::Class::kStatusError, self); 1650 return NULL; 1651 } 1652 CHECK(klass->IsLoaded()); 1653 // Link the class (if necessary) 1654 CHECK(!klass->IsResolved()); 1655 // TODO: Use fast jobjects? 1656 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1657 1658 mirror::Class* new_class = nullptr; 1659 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 1660 // Linking failed. 1661 klass->SetStatus(mirror::Class::kStatusError, self); 1662 return NULL; 1663 } 1664 CHECK(new_class != nullptr) << descriptor; 1665 CHECK(new_class->IsResolved()) << descriptor; 1666 1667 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 1668 1669 /* 1670 * We send CLASS_PREPARE events to the debugger from here. The 1671 * definition of "preparation" is creating the static fields for a 1672 * class and initializing them to the standard default values, but not 1673 * executing any code (that comes later, during "initialization"). 1674 * 1675 * We did the static preparation in LinkClass. 1676 * 1677 * The class has been prepared and resolved but possibly not yet verified 1678 * at this point. 1679 */ 1680 Dbg::PostClassPrepare(new_class_h.Get()); 1681 1682 return new_class_h.Get(); 1683} 1684 1685uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 1686 const DexFile::ClassDef& dex_class_def) { 1687 const byte* class_data = dex_file.GetClassData(dex_class_def); 1688 size_t num_ref = 0; 1689 size_t num_32 = 0; 1690 size_t num_64 = 0; 1691 if (class_data != NULL) { 1692 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1693 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1694 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1695 char c = descriptor[0]; 1696 if (c == 'L' || c == '[') { 1697 num_ref++; 1698 } else if (c == 'J' || c == 'D') { 1699 num_64++; 1700 } else { 1701 num_32++; 1702 } 1703 } 1704 } 1705 return mirror::Class::ComputeClassSize(false, 0, num_32, num_64, num_ref); 1706} 1707 1708OatFile::OatClass ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1709 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1710 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1711 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1712 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1713 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1714 &dex_location_checksum); 1715 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1716 return oat_dex_file->GetOatClass(class_def_idx); 1717} 1718 1719static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1720 uint32_t method_idx) { 1721 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1722 const byte* class_data = dex_file.GetClassData(class_def); 1723 CHECK(class_data != NULL); 1724 ClassDataItemIterator it(dex_file, class_data); 1725 // Skip fields 1726 while (it.HasNextStaticField()) { 1727 it.Next(); 1728 } 1729 while (it.HasNextInstanceField()) { 1730 it.Next(); 1731 } 1732 // Process methods 1733 size_t class_def_method_index = 0; 1734 while (it.HasNextDirectMethod()) { 1735 if (it.GetMemberIndex() == method_idx) { 1736 return class_def_method_index; 1737 } 1738 class_def_method_index++; 1739 it.Next(); 1740 } 1741 while (it.HasNextVirtualMethod()) { 1742 if (it.GetMemberIndex() == method_idx) { 1743 return class_def_method_index; 1744 } 1745 class_def_method_index++; 1746 it.Next(); 1747 } 1748 DCHECK(!it.HasNext()); 1749 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1750 return 0; 1751} 1752 1753const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1754 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1755 // method for direct methods (or virtual methods made direct). 1756 mirror::Class* declaring_class = method->GetDeclaringClass(); 1757 size_t oat_method_index; 1758 if (method->IsStatic() || method->IsDirect()) { 1759 // Simple case where the oat method index was stashed at load time. 1760 oat_method_index = method->GetMethodIndex(); 1761 } else { 1762 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1763 // by search for its position in the declared virtual methods. 1764 oat_method_index = declaring_class->NumDirectMethods(); 1765 size_t end = declaring_class->NumVirtualMethods(); 1766 bool found = false; 1767 for (size_t i = 0; i < end; i++) { 1768 if (declaring_class->GetVirtualMethod(i) == method) { 1769 found = true; 1770 break; 1771 } 1772 oat_method_index++; 1773 } 1774 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1775 } 1776 DCHECK_EQ(oat_method_index, 1777 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1778 method->GetDeclaringClass()->GetDexClassDefIndex(), 1779 method->GetDexMethodIndex())); 1780 const OatFile::OatClass oat_class = GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1781 declaring_class->GetDexClassDefIndex()); 1782 1783 return oat_class.GetOatMethod(oat_method_index); 1784} 1785 1786// Special case to get oat code without overwriting a trampoline. 1787const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1788 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1789 if (method->IsProxyMethod()) { 1790 return GetQuickProxyInvokeHandler(); 1791 } 1792 const void* result = GetOatMethodFor(method).GetQuickCode(); 1793 if (result == nullptr) { 1794 if (method->IsNative()) { 1795 // No code and native? Use generic trampoline. 1796 result = GetQuickGenericJniTrampoline(); 1797 } else if (method->IsPortableCompiled()) { 1798 // No code? Do we expect portable code? 1799 result = GetQuickToPortableBridge(); 1800 } else { 1801 // No code? You must mean to go into the interpreter. 1802 result = GetQuickToInterpreterBridge(); 1803 } 1804 } 1805 return result; 1806} 1807 1808const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1809 bool* have_portable_code) { 1810 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1811 *have_portable_code = false; 1812 if (method->IsProxyMethod()) { 1813 return GetPortableProxyInvokeHandler(); 1814 } 1815 const OatFile::OatMethod oat_method = GetOatMethodFor(method); 1816 const void* result = oat_method.GetPortableCode(); 1817 if (result == nullptr) { 1818 if (oat_method.GetQuickCode() == nullptr) { 1819 // No code? You must mean to go into the interpreter. 1820 result = GetPortableToInterpreterBridge(); 1821 } else { 1822 // No code? But there's quick code, so use a bridge. 1823 result = GetPortableToQuickBridge(); 1824 } 1825 } else { 1826 *have_portable_code = true; 1827 } 1828 return result; 1829} 1830 1831const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1832 uint32_t method_idx) { 1833 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1834 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1835 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 1836} 1837 1838const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1839 uint32_t method_idx) { 1840 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1841 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1842 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 1843} 1844 1845// Returns true if the method must run with interpreter, false otherwise. 1846static bool NeedsInterpreter( 1847 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 1848 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1849 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1850 // No code: need interpreter. 1851 // May return true for native code, in the case of generic JNI 1852 // DCHECK(!method->IsNative()); 1853 return true; 1854 } 1855#ifdef ART_SEA_IR_MODE 1856 ScopedObjectAccess soa(Thread::Current()); 1857 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1858 LOG(INFO) << "Found " << PrettyMethod(method); 1859 return false; 1860 } 1861#endif 1862 // If interpreter mode is enabled, every method (except native and proxy) must 1863 // be run with interpreter. 1864 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1865 !method->IsNative() && !method->IsProxyMethod(); 1866} 1867 1868void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1869 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1870 if (klass->NumDirectMethods() == 0) { 1871 return; // No direct methods => no static methods. 1872 } 1873 Runtime* runtime = Runtime::Current(); 1874 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1875 return; // OAT file unavailable. 1876 } 1877 const DexFile& dex_file = klass->GetDexFile(); 1878 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 1879 CHECK(dex_class_def != nullptr); 1880 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1881 // There should always be class data if there were direct methods. 1882 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1883 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 1884 ClassDataItemIterator it(dex_file, class_data); 1885 // Skip fields 1886 while (it.HasNextStaticField()) { 1887 it.Next(); 1888 } 1889 while (it.HasNextInstanceField()) { 1890 it.Next(); 1891 } 1892 // Link the code of methods skipped by LinkCode. 1893 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1894 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1895 if (!method->IsStatic()) { 1896 // Only update static methods. 1897 continue; 1898 } 1899 const void* portable_code = oat_class.GetOatMethod(method_index).GetPortableCode(); 1900 const void* quick_code = oat_class.GetOatMethod(method_index).GetQuickCode(); 1901 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1902 bool have_portable_code = false; 1903 if (enter_interpreter) { 1904 // Use interpreter entry point. 1905 // Check whether the method is native, in which case it's generic JNI. 1906 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 1907 quick_code = GetQuickGenericJniTrampoline(); 1908 portable_code = GetPortableToQuickBridge(); 1909 } else { 1910 portable_code = GetPortableToInterpreterBridge(); 1911 quick_code = GetQuickToInterpreterBridge(); 1912 } 1913 } else { 1914 if (portable_code == nullptr) { 1915 portable_code = GetPortableToQuickBridge(); 1916 } else { 1917 have_portable_code = true; 1918 } 1919 if (quick_code == nullptr) { 1920 quick_code = GetQuickToPortableBridge(); 1921 } 1922 } 1923 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1924 have_portable_code); 1925 } 1926 // Ignore virtual methods on the iterator. 1927} 1928 1929void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 1930 const DexFile& dex_file, uint32_t dex_method_index, 1931 uint32_t method_index) { 1932 // Method shouldn't have already been linked. 1933 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1934 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1935 // Every kind of method should at least get an invoke stub from the oat_method. 1936 // non-abstract methods also get their code pointers. 1937 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1938 oat_method.LinkMethod(method.Get()); 1939 1940 // Install entry point from interpreter. 1941 Runtime* runtime = Runtime::Current(); 1942 bool enter_interpreter = NeedsInterpreter(method.Get(), 1943 method->GetEntryPointFromQuickCompiledCode(), 1944 method->GetEntryPointFromPortableCompiledCode()); 1945 if (enter_interpreter && !method->IsNative()) { 1946 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1947 } else { 1948 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1949 } 1950 1951 if (method->IsAbstract()) { 1952 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1953 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1954 return; 1955 } 1956 1957 bool have_portable_code = false; 1958 if (method->IsStatic() && !method->IsConstructor()) { 1959 // For static methods excluding the class initializer, install the trampoline. 1960 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1961 // after initializing class (see ClassLinker::InitializeClass method). 1962 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 1963 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 1964 } else if (enter_interpreter) { 1965 if (!method->IsNative()) { 1966 // Set entry point from compiled code if there's no code or in interpreter only mode. 1967 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1968 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1969 } else { 1970 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 1971 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1972 } 1973 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1974 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1975 have_portable_code = true; 1976 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1977 } else { 1978 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1979 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1980 } 1981 1982 if (method->IsNative()) { 1983 // Unregistering restores the dlsym lookup stub. 1984 method->UnregisterNative(Thread::Current()); 1985 1986 if (enter_interpreter) { 1987 // We have a native method here without code. Then it should have either the GenericJni 1988 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 1989 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 1990 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 1991 } 1992 } 1993 1994 // Allow instrumentation its chance to hijack code. 1995 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 1996 method->GetEntryPointFromQuickCompiledCode(), 1997 method->GetEntryPointFromPortableCompiledCode(), 1998 have_portable_code); 1999} 2000 2001void ClassLinker::LoadClass(const DexFile& dex_file, 2002 const DexFile::ClassDef& dex_class_def, 2003 Handle<mirror::Class> klass, 2004 mirror::ClassLoader* class_loader) { 2005 CHECK(klass.Get() != NULL); 2006 CHECK(klass->GetDexCache() != NULL); 2007 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2008 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2009 CHECK(descriptor != NULL); 2010 2011 klass->SetClass(GetClassRoot(kJavaLangClass)); 2012 if (kUseBakerOrBrooksReadBarrier) { 2013 klass->AssertReadBarrierPointer(); 2014 } 2015 uint32_t access_flags = dex_class_def.access_flags_; 2016 // Make sure that none of our runtime-only flags are set. 2017 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2018 klass->SetAccessFlags(access_flags); 2019 klass->SetClassLoader(class_loader); 2020 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2021 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2022 2023 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2024 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2025 2026 const byte* class_data = dex_file.GetClassData(dex_class_def); 2027 if (class_data == NULL) { 2028 return; // no fields or methods - for example a marker interface 2029 } 2030 2031 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2032 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 2033 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2034 } else { 2035 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2036 } 2037} 2038 2039void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2040 const byte* class_data, 2041 Handle<mirror::Class> klass, 2042 mirror::ClassLoader* class_loader, 2043 const OatFile::OatClass* oat_class) { 2044 // Load fields. 2045 ClassDataItemIterator it(dex_file, class_data); 2046 Thread* self = Thread::Current(); 2047 if (it.NumStaticFields() != 0) { 2048 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2049 if (UNLIKELY(statics == NULL)) { 2050 CHECK(self->IsExceptionPending()); // OOME. 2051 return; 2052 } 2053 klass->SetSFields(statics); 2054 } 2055 if (it.NumInstanceFields() != 0) { 2056 mirror::ObjectArray<mirror::ArtField>* fields = 2057 AllocArtFieldArray(self, it.NumInstanceFields()); 2058 if (UNLIKELY(fields == NULL)) { 2059 CHECK(self->IsExceptionPending()); // OOME. 2060 return; 2061 } 2062 klass->SetIFields(fields); 2063 } 2064 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2065 StackHandleScope<1> hs(self); 2066 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2067 if (UNLIKELY(sfield.Get() == NULL)) { 2068 CHECK(self->IsExceptionPending()); // OOME. 2069 return; 2070 } 2071 klass->SetStaticField(i, sfield.Get()); 2072 LoadField(dex_file, it, klass, sfield); 2073 } 2074 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2075 StackHandleScope<1> hs(self); 2076 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2077 if (UNLIKELY(ifield.Get() == NULL)) { 2078 CHECK(self->IsExceptionPending()); // OOME. 2079 return; 2080 } 2081 klass->SetInstanceField(i, ifield.Get()); 2082 LoadField(dex_file, it, klass, ifield); 2083 } 2084 2085 // Load methods. 2086 if (it.NumDirectMethods() != 0) { 2087 // TODO: append direct methods to class object 2088 mirror::ObjectArray<mirror::ArtMethod>* directs = 2089 AllocArtMethodArray(self, it.NumDirectMethods()); 2090 if (UNLIKELY(directs == NULL)) { 2091 CHECK(self->IsExceptionPending()); // OOME. 2092 return; 2093 } 2094 klass->SetDirectMethods(directs); 2095 } 2096 if (it.NumVirtualMethods() != 0) { 2097 // TODO: append direct methods to class object 2098 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2099 AllocArtMethodArray(self, it.NumVirtualMethods()); 2100 if (UNLIKELY(virtuals == NULL)) { 2101 CHECK(self->IsExceptionPending()); // OOME. 2102 return; 2103 } 2104 klass->SetVirtualMethods(virtuals); 2105 } 2106 size_t class_def_method_index = 0; 2107 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2108 StackHandleScope<1> hs(self); 2109 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2110 if (UNLIKELY(method.Get() == NULL)) { 2111 CHECK(self->IsExceptionPending()); // OOME. 2112 return; 2113 } 2114 klass->SetDirectMethod(i, method.Get()); 2115 if (oat_class != nullptr) { 2116 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2117 } 2118 method->SetMethodIndex(class_def_method_index); 2119 class_def_method_index++; 2120 } 2121 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2122 StackHandleScope<1> hs(self); 2123 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2124 if (UNLIKELY(method.Get() == NULL)) { 2125 CHECK(self->IsExceptionPending()); // OOME. 2126 return; 2127 } 2128 klass->SetVirtualMethod(i, method.Get()); 2129 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2130 if (oat_class != nullptr) { 2131 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2132 } 2133 class_def_method_index++; 2134 } 2135 DCHECK(!it.HasNext()); 2136} 2137 2138void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2139 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2140 uint32_t field_idx = it.GetMemberIndex(); 2141 dst->SetDexFieldIndex(field_idx); 2142 dst->SetDeclaringClass(klass.Get()); 2143 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2144} 2145 2146mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2147 const ClassDataItemIterator& it, 2148 Handle<mirror::Class> klass) { 2149 uint32_t dex_method_idx = it.GetMemberIndex(); 2150 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2151 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2152 2153 mirror::ArtMethod* dst = AllocArtMethod(self); 2154 if (UNLIKELY(dst == NULL)) { 2155 CHECK(self->IsExceptionPending()); // OOME. 2156 return NULL; 2157 } 2158 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2159 2160 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2161 dst->SetDexMethodIndex(dex_method_idx); 2162 dst->SetDeclaringClass(klass.Get()); 2163 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2164 2165 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2166 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2167 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2168 2169 uint32_t access_flags = it.GetMemberAccessFlags(); 2170 2171 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2172 // Set finalizable flag on declaring class. 2173 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2174 // Void return type. 2175 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 2176 klass->SetFinalizable(); 2177 } else { 2178 std::string klass_descriptor = klass->GetDescriptor(); 2179 // The Enum class declares a "final" finalize() method to prevent subclasses from 2180 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2181 // subclasses, so we exclude it here. 2182 // We also want to avoid setting the flag on Object, where we know that finalize() is 2183 // empty. 2184 if (klass_descriptor.compare("Ljava/lang/Object;") != 0 && 2185 klass_descriptor.compare("Ljava/lang/Enum;") != 0) { 2186 klass->SetFinalizable(); 2187 } 2188 } 2189 } 2190 } else if (method_name[0] == '<') { 2191 // Fix broken access flags for initializers. Bug 11157540. 2192 bool is_init = (strcmp("<init>", method_name) == 0); 2193 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2194 if (UNLIKELY(!is_init && !is_clinit)) { 2195 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2196 } else { 2197 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2198 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2199 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2200 access_flags |= kAccConstructor; 2201 } 2202 } 2203 } 2204 dst->SetAccessFlags(access_flags); 2205 2206 self->EndAssertNoThreadSuspension(old_cause); 2207 return dst; 2208} 2209 2210void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2211 Thread* self = Thread::Current(); 2212 StackHandleScope<1> hs(self); 2213 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2214 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2215 AppendToBootClassPath(dex_file, dex_cache); 2216} 2217 2218void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2219 Handle<mirror::DexCache> dex_cache) { 2220 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2221 boot_class_path_.push_back(&dex_file); 2222 RegisterDexFile(dex_file, dex_cache); 2223} 2224 2225bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2226 dex_lock_.AssertSharedHeld(Thread::Current()); 2227 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2228 mirror::DexCache* dex_cache = GetDexCache(i); 2229 if (dex_cache->GetDexFile() == &dex_file) { 2230 return true; 2231 } 2232 } 2233 return false; 2234} 2235 2236bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2237 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2238 return IsDexFileRegisteredLocked(dex_file); 2239} 2240 2241void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2242 Handle<mirror::DexCache> dex_cache) { 2243 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2244 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2245 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2246 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2247 dex_caches_.push_back(dex_cache.Get()); 2248 dex_cache->SetDexFile(&dex_file); 2249 if (log_new_dex_caches_roots_) { 2250 // TODO: This is not safe if we can remove dex caches. 2251 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2252 } 2253} 2254 2255void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2256 Thread* self = Thread::Current(); 2257 { 2258 ReaderMutexLock mu(self, dex_lock_); 2259 if (IsDexFileRegisteredLocked(dex_file)) { 2260 return; 2261 } 2262 } 2263 // Don't alloc while holding the lock, since allocation may need to 2264 // suspend all threads and another thread may need the dex_lock_ to 2265 // get to a suspend point. 2266 StackHandleScope<1> hs(self); 2267 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2268 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2269 { 2270 WriterMutexLock mu(self, dex_lock_); 2271 if (IsDexFileRegisteredLocked(dex_file)) { 2272 return; 2273 } 2274 RegisterDexFileLocked(dex_file, dex_cache); 2275 } 2276} 2277 2278void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2279 Handle<mirror::DexCache> dex_cache) { 2280 WriterMutexLock mu(Thread::Current(), dex_lock_); 2281 RegisterDexFileLocked(dex_file, dex_cache); 2282} 2283 2284mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2285 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2286 // Search assuming unique-ness of dex file. 2287 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2288 mirror::DexCache* dex_cache = GetDexCache(i); 2289 if (dex_cache->GetDexFile() == &dex_file) { 2290 return dex_cache; 2291 } 2292 } 2293 // Search matching by location name. 2294 std::string location(dex_file.GetLocation()); 2295 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2296 mirror::DexCache* dex_cache = GetDexCache(i); 2297 if (dex_cache->GetDexFile()->GetLocation() == location) { 2298 return dex_cache; 2299 } 2300 } 2301 // Failure, dump diagnostic and abort. 2302 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2303 mirror::DexCache* dex_cache = GetDexCache(i); 2304 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2305 } 2306 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2307 return NULL; 2308} 2309 2310void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2311 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2312 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2313 mirror::DexCache* dex_cache = GetDexCache(i); 2314 dex_cache->Fixup(resolution_method); 2315 } 2316} 2317 2318mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2319 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 2320 if (UNLIKELY(klass == NULL)) { 2321 return NULL; 2322 } 2323 return InitializePrimitiveClass(klass, type); 2324} 2325 2326mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2327 Primitive::Type type) { 2328 CHECK(primitive_class != NULL); 2329 // Must hold lock on object when initializing. 2330 Thread* self = Thread::Current(); 2331 StackHandleScope<1> hs(self); 2332 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2333 ObjectLock<mirror::Class> lock(self, h_class); 2334 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2335 primitive_class->SetPrimitiveType(type); 2336 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2337 const char* descriptor = Primitive::Descriptor(type); 2338 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2339 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2340 return primitive_class; 2341} 2342 2343// Create an array class (i.e. the class object for the array, not the 2344// array itself). "descriptor" looks like "[C" or "[[[[B" or 2345// "[Ljava/lang/String;". 2346// 2347// If "descriptor" refers to an array of primitives, look up the 2348// primitive type's internally-generated class object. 2349// 2350// "class_loader" is the class loader of the class that's referring to 2351// us. It's used to ensure that we're looking for the element type in 2352// the right context. It does NOT become the class loader for the 2353// array class; that always comes from the base element class. 2354// 2355// Returns NULL with an exception raised on failure. 2356mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2357 Handle<mirror::ClassLoader> class_loader) { 2358 // Identify the underlying component type 2359 CHECK_EQ('[', descriptor[0]); 2360 StackHandleScope<2> hs(self); 2361 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2362 if (component_type.Get() == nullptr) { 2363 DCHECK(self->IsExceptionPending()); 2364 return nullptr; 2365 } 2366 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2367 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2368 return nullptr; 2369 } 2370 // See if the component type is already loaded. Array classes are 2371 // always associated with the class loader of their underlying 2372 // element type -- an array of Strings goes with the loader for 2373 // java/lang/String -- so we need to look for it there. (The 2374 // caller should have checked for the existence of the class 2375 // before calling here, but they did so with *their* class loader, 2376 // not the component type's loader.) 2377 // 2378 // If we find it, the caller adds "loader" to the class' initiating 2379 // loader list, which should prevent us from going through this again. 2380 // 2381 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2382 // are the same, because our caller (FindClass) just did the 2383 // lookup. (Even if we get this wrong we still have correct behavior, 2384 // because we effectively do this lookup again when we add the new 2385 // class to the hash table --- necessary because of possible races with 2386 // other threads.) 2387 if (class_loader.Get() != component_type->GetClassLoader()) { 2388 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2389 if (new_class != NULL) { 2390 return new_class; 2391 } 2392 } 2393 2394 // Fill out the fields in the Class. 2395 // 2396 // It is possible to execute some methods against arrays, because 2397 // all arrays are subclasses of java_lang_Object_, so we need to set 2398 // up a vtable. We can just point at the one in java_lang_Object_. 2399 // 2400 // Array classes are simple enough that we don't need to do a full 2401 // link step. 2402 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2403 if (UNLIKELY(!init_done_)) { 2404 // Classes that were hand created, ie not by FindSystemClass 2405 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2406 new_class.Assign(GetClassRoot(kClassArrayClass)); 2407 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2408 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2409 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2410 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2411 } else if (strcmp(descriptor, 2412 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2413 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2414 } else if (strcmp(descriptor, 2415 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2416 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2417 } else if (strcmp(descriptor, "[C") == 0) { 2418 new_class.Assign(GetClassRoot(kCharArrayClass)); 2419 } else if (strcmp(descriptor, "[I") == 0) { 2420 new_class.Assign(GetClassRoot(kIntArrayClass)); 2421 } 2422 } 2423 if (new_class.Get() == nullptr) { 2424 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 2425 if (new_class.Get() == nullptr) { 2426 return nullptr; 2427 } 2428 new_class->SetComponentType(component_type.Get()); 2429 } 2430 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2431 DCHECK(new_class->GetComponentType() != NULL); 2432 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2433 new_class->SetSuperClass(java_lang_Object); 2434 new_class->SetVTable(java_lang_Object->GetVTable()); 2435 new_class->SetPrimitiveType(Primitive::kPrimNot); 2436 new_class->SetClassLoader(component_type->GetClassLoader()); 2437 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 2438 new_class->PopulateEmbeddedImtAndVTable(); 2439 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2440 // don't need to set new_class->SetObjectSize(..) 2441 // because Object::SizeOf delegates to Array::SizeOf 2442 2443 2444 // All arrays have java/lang/Cloneable and java/io/Serializable as 2445 // interfaces. We need to set that up here, so that stuff like 2446 // "instanceof" works right. 2447 // 2448 // Note: The GC could run during the call to FindSystemClass, 2449 // so we need to make sure the class object is GC-valid while we're in 2450 // there. Do this by clearing the interface list so the GC will just 2451 // think that the entries are null. 2452 2453 2454 // Use the single, global copies of "interfaces" and "iftable" 2455 // (remember not to free them for arrays). 2456 { 2457 mirror::IfTable* array_iftable = 2458 ReadBarrier::BarrierForRoot<mirror::IfTable, kWithReadBarrier>(&array_iftable_); 2459 CHECK(array_iftable != nullptr); 2460 new_class->SetIfTable(array_iftable); 2461 } 2462 2463 // Inherit access flags from the component type. 2464 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2465 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2466 access_flags &= kAccJavaFlagsMask; 2467 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2468 // and remove "interface". 2469 access_flags |= kAccAbstract | kAccFinal; 2470 access_flags &= ~kAccInterface; 2471 2472 new_class->SetAccessFlags(access_flags); 2473 2474 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2475 if (existing == nullptr) { 2476 return new_class.Get(); 2477 } 2478 // Another thread must have loaded the class after we 2479 // started but before we finished. Abandon what we've 2480 // done. 2481 // 2482 // (Yes, this happens.) 2483 2484 return existing; 2485} 2486 2487mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2488 switch (type) { 2489 case 'B': 2490 return GetClassRoot(kPrimitiveByte); 2491 case 'C': 2492 return GetClassRoot(kPrimitiveChar); 2493 case 'D': 2494 return GetClassRoot(kPrimitiveDouble); 2495 case 'F': 2496 return GetClassRoot(kPrimitiveFloat); 2497 case 'I': 2498 return GetClassRoot(kPrimitiveInt); 2499 case 'J': 2500 return GetClassRoot(kPrimitiveLong); 2501 case 'S': 2502 return GetClassRoot(kPrimitiveShort); 2503 case 'Z': 2504 return GetClassRoot(kPrimitiveBoolean); 2505 case 'V': 2506 return GetClassRoot(kPrimitiveVoid); 2507 default: 2508 break; 2509 } 2510 std::string printable_type(PrintableChar(type)); 2511 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2512 return NULL; 2513} 2514 2515mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2516 size_t hash) { 2517 if (VLOG_IS_ON(class_linker)) { 2518 mirror::DexCache* dex_cache = klass->GetDexCache(); 2519 std::string source; 2520 if (dex_cache != NULL) { 2521 source += " from "; 2522 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2523 } 2524 LOG(INFO) << "Loaded class " << descriptor << source; 2525 } 2526 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2527 mirror::Class* existing = 2528 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2529 if (existing != NULL) { 2530 return existing; 2531 } 2532 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == NULL && 2533 dex_cache_image_class_lookup_required_) { 2534 // Check a class loaded with the system class loader matches one in the image if the class 2535 // is in the image. 2536 existing = LookupClassFromImage(descriptor); 2537 if (existing != NULL) { 2538 CHECK(klass == existing); 2539 } 2540 } 2541 VerifyObject(klass); 2542 class_table_.insert(std::make_pair(hash, klass)); 2543 if (log_new_class_table_roots_) { 2544 new_class_roots_.push_back(std::make_pair(hash, klass)); 2545 } 2546 return NULL; 2547} 2548 2549mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 2550 size_t hash) { 2551 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2552 mirror::Class* existing = 2553 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2554 2555 if (existing == nullptr) { 2556 CHECK(klass->IsProxyClass()); 2557 return nullptr; 2558 } 2559 2560 CHECK_NE(existing, klass) << descriptor; 2561 CHECK(!existing->IsResolved()) << descriptor; 2562 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 2563 2564 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2565 ++it) { 2566 mirror::Class** root = &it->second; 2567 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2568 if (klass == existing) { 2569 class_table_.erase(it); 2570 break; 2571 } 2572 } 2573 2574 CHECK(!klass->IsTemp()) << descriptor; 2575 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 2576 dex_cache_image_class_lookup_required_) { 2577 // Check a class loaded with the system class loader matches one in the image if the class 2578 // is in the image. 2579 existing = LookupClassFromImage(descriptor); 2580 if (existing != nullptr) { 2581 CHECK(klass == existing) << descriptor; 2582 } 2583 } 2584 VerifyObject(klass); 2585 2586 class_table_.insert(std::make_pair(hash, klass)); 2587 if (log_new_class_table_roots_) { 2588 new_class_roots_.push_back(std::make_pair(hash, klass)); 2589 } 2590 2591 return existing; 2592} 2593 2594bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2595 size_t hash = Hash(descriptor); 2596 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2597 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2598 it != end && it->first == hash; 2599 ++it) { 2600 mirror::Class** root = &it->second; 2601 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2602 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2603 class_table_.erase(it); 2604 return true; 2605 } 2606 } 2607 return false; 2608} 2609 2610mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2611 const mirror::ClassLoader* class_loader) { 2612 size_t hash = Hash(descriptor); 2613 { 2614 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2615 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2616 if (result != NULL) { 2617 return result; 2618 } 2619 } 2620 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2621 return NULL; 2622 } else { 2623 // Lookup failed but need to search dex_caches_. 2624 mirror::Class* result = LookupClassFromImage(descriptor); 2625 if (result != NULL) { 2626 InsertClass(descriptor, result, hash); 2627 } else { 2628 // Searching the image dex files/caches failed, we don't want to get into this situation 2629 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2630 // classes into the class table. 2631 const int32_t kMaxFailedDexCacheLookups = 1000; 2632 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2633 MoveImageClassesToClassTable(); 2634 } 2635 } 2636 return result; 2637 } 2638} 2639 2640mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2641 const mirror::ClassLoader* class_loader, 2642 size_t hash) { 2643 auto end = class_table_.end(); 2644 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2645 mirror::Class** root = &it->second; 2646 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2647 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2648 if (kIsDebugBuild) { 2649 // Check for duplicates in the table. 2650 for (++it; it != end && it->first == hash; ++it) { 2651 mirror::Class** root2 = &it->second; 2652 mirror::Class* klass2 = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root2); 2653 CHECK(!(klass2->GetClassLoader() == class_loader && 2654 klass2->DescriptorEquals(descriptor))) 2655 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2656 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2657 } 2658 } 2659 return klass; 2660 } 2661 } 2662 return NULL; 2663} 2664 2665static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2666 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2667 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2668 CHECK(image != NULL); 2669 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2670 return root->AsObjectArray<mirror::DexCache>(); 2671} 2672 2673void ClassLinker::MoveImageClassesToClassTable() { 2674 Thread* self = Thread::Current(); 2675 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2676 if (!dex_cache_image_class_lookup_required_) { 2677 return; // All dex cache classes are already in the class table. 2678 } 2679 const char* old_no_suspend_cause = 2680 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2681 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2682 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2683 mirror::DexCache* dex_cache = dex_caches->Get(i); 2684 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2685 for (int32_t j = 0; j < types->GetLength(); j++) { 2686 mirror::Class* klass = types->Get(j); 2687 if (klass != NULL) { 2688 DCHECK(klass->GetClassLoader() == NULL); 2689 std::string descriptor = klass->GetDescriptor(); 2690 size_t hash = Hash(descriptor.c_str()); 2691 mirror::Class* existing = LookupClassFromTableLocked(descriptor.c_str(), NULL, hash); 2692 if (existing != NULL) { 2693 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2694 << PrettyClassAndClassLoader(klass); 2695 } else { 2696 class_table_.insert(std::make_pair(hash, klass)); 2697 if (log_new_class_table_roots_) { 2698 new_class_roots_.push_back(std::make_pair(hash, klass)); 2699 } 2700 } 2701 } 2702 } 2703 } 2704 dex_cache_image_class_lookup_required_ = false; 2705 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2706} 2707 2708mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2709 Thread* self = Thread::Current(); 2710 const char* old_no_suspend_cause = 2711 self->StartAssertNoThreadSuspension("Image class lookup"); 2712 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2713 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2714 mirror::DexCache* dex_cache = dex_caches->Get(i); 2715 const DexFile* dex_file = dex_cache->GetDexFile(); 2716 // Try binary searching the string/type index. 2717 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2718 if (string_id != NULL) { 2719 const DexFile::TypeId* type_id = 2720 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2721 if (type_id != NULL) { 2722 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2723 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2724 if (klass != NULL) { 2725 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2726 return klass; 2727 } 2728 } 2729 } 2730 } 2731 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2732 return NULL; 2733} 2734 2735void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2736 result.clear(); 2737 if (dex_cache_image_class_lookup_required_) { 2738 MoveImageClassesToClassTable(); 2739 } 2740 size_t hash = Hash(descriptor); 2741 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2742 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2743 it != end && it->first == hash; ++it) { 2744 mirror::Class** root = &it->second; 2745 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2746 if (klass->DescriptorEquals(descriptor)) { 2747 result.push_back(klass); 2748 } 2749 } 2750} 2751 2752void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 2753 // TODO: assert that the monitor on the Class is held 2754 Thread* self = Thread::Current(); 2755 ObjectLock<mirror::Class> lock(self, klass); 2756 2757 // Don't attempt to re-verify if already sufficiently verified. 2758 if (klass->IsVerified() || 2759 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2760 return; 2761 } 2762 2763 // The class might already be erroneous, for example at compile time if we attempted to verify 2764 // this class as a parent to another. 2765 if (klass->IsErroneous()) { 2766 ThrowEarlierClassFailure(klass.Get()); 2767 return; 2768 } 2769 2770 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2771 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2772 } else { 2773 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2774 << PrettyClass(klass.Get()); 2775 CHECK(!Runtime::Current()->IsCompiler()); 2776 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2777 } 2778 2779 // Skip verification if disabled. 2780 if (!Runtime::Current()->IsVerificationEnabled()) { 2781 klass->SetStatus(mirror::Class::kStatusVerified, self); 2782 return; 2783 } 2784 2785 // Verify super class. 2786 StackHandleScope<2> hs(self); 2787 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 2788 if (super.Get() != NULL) { 2789 // Acquire lock to prevent races on verifying the super class. 2790 ObjectLock<mirror::Class> lock(self, super); 2791 2792 if (!super->IsVerified() && !super->IsErroneous()) { 2793 VerifyClass(super); 2794 } 2795 if (!super->IsCompileTimeVerified()) { 2796 std::string error_msg( 2797 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2798 PrettyDescriptor(klass.Get()).c_str(), 2799 PrettyDescriptor(super.Get()).c_str())); 2800 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2801 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 2802 if (cause.Get() != nullptr) { 2803 self->ClearException(); 2804 } 2805 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2806 if (cause.Get() != nullptr) { 2807 self->GetException(nullptr)->SetCause(cause.Get()); 2808 } 2809 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2810 if (Runtime::Current()->IsCompiler()) { 2811 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2812 } 2813 klass->SetStatus(mirror::Class::kStatusError, self); 2814 return; 2815 } 2816 } 2817 2818 // Try to use verification information from the oat file, otherwise do runtime verification. 2819 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2820 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2821 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 2822 if (oat_file_class_status == mirror::Class::kStatusError) { 2823 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2824 << PrettyDescriptor(klass.Get()) << " in " 2825 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2826 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 2827 PrettyDescriptor(klass.Get()).c_str()); 2828 klass->SetStatus(mirror::Class::kStatusError, self); 2829 return; 2830 } 2831 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2832 std::string error_msg; 2833 if (!preverified) { 2834 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 2835 Runtime::Current()->IsCompiler(), 2836 &error_msg); 2837 } 2838 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2839 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2840 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 2841 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2842 << " because: " << error_msg; 2843 } 2844 self->AssertNoPendingException(); 2845 // Make sure all classes referenced by catch blocks are resolved. 2846 ResolveClassExceptionHandlerTypes(dex_file, klass); 2847 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2848 // Even though there were no verifier failures we need to respect whether the super-class 2849 // was verified or requiring runtime reverification. 2850 if (super.Get() == NULL || super->IsVerified()) { 2851 klass->SetStatus(mirror::Class::kStatusVerified, self); 2852 } else { 2853 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2854 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2855 // Pretend a soft failure occured so that we don't consider the class verified below. 2856 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2857 } 2858 } else { 2859 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2860 // Soft failures at compile time should be retried at runtime. Soft 2861 // failures at runtime will be handled by slow paths in the generated 2862 // code. Set status accordingly. 2863 if (Runtime::Current()->IsCompiler()) { 2864 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2865 } else { 2866 klass->SetStatus(mirror::Class::kStatusVerified, self); 2867 } 2868 } 2869 } else { 2870 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 2871 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2872 << " because: " << error_msg; 2873 self->AssertNoPendingException(); 2874 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2875 klass->SetStatus(mirror::Class::kStatusError, self); 2876 } 2877 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2878 // Class is verified so we don't need to do any access check on its methods. 2879 // Let the interpreter know it by setting the kAccPreverified flag onto each 2880 // method. 2881 // Note: we're going here during compilation and at runtime. When we set the 2882 // kAccPreverified flag when compiling image classes, the flag is recorded 2883 // in the image and is set when loading the image. 2884 klass->SetPreverifiedFlagOnAllMethods(); 2885 } 2886} 2887 2888bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2889 mirror::Class::Status& oat_file_class_status) { 2890 // If we're compiling, we can only verify the class using the oat file if 2891 // we are not compiling the image or if the class we're verifying is not part of 2892 // the app. In other words, we will only check for preverification of bootclasspath 2893 // classes. 2894 if (Runtime::Current()->IsCompiler()) { 2895 // Are we compiling the bootclasspath? 2896 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2897 return false; 2898 } 2899 // We are compiling an app (not the image). 2900 2901 // Is this an app class? (I.e. not a bootclasspath class) 2902 if (klass->GetClassLoader() != NULL) { 2903 return false; 2904 } 2905 } 2906 2907 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2908 // Make this work with gtests, which do not set up the image properly. 2909 // TODO: we should clean up gtests to set up the image path properly. 2910 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2911 return false; 2912 } 2913 2914 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2915 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2916 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2917 &dex_location_checksum); 2918 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2919 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2920 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 2921 if (oat_file_class_status == mirror::Class::kStatusVerified || 2922 oat_file_class_status == mirror::Class::kStatusInitialized) { 2923 return true; 2924 } 2925 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2926 // Compile time verification failed with a soft error. Compile time verification can fail 2927 // because we have incomplete type information. Consider the following: 2928 // class ... { 2929 // Foo x; 2930 // .... () { 2931 // if (...) { 2932 // v1 gets assigned a type of resolved class Foo 2933 // } else { 2934 // v1 gets assigned a type of unresolved class Bar 2935 // } 2936 // iput x = v1 2937 // } } 2938 // when we merge v1 following the if-the-else it results in Conflict 2939 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2940 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2941 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2942 // at compile time). 2943 return false; 2944 } 2945 if (oat_file_class_status == mirror::Class::kStatusError) { 2946 // Compile time verification failed with a hard error. This is caused by invalid instructions 2947 // in the class. These errors are unrecoverable. 2948 return false; 2949 } 2950 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2951 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2952 // not loading the class. 2953 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2954 // isn't a problem and this case shouldn't occur 2955 return false; 2956 } 2957 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2958 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2959 << klass->GetDescriptor(); 2960 2961 return false; 2962} 2963 2964void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2965 Handle<mirror::Class> klass) { 2966 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2967 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2968 } 2969 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2970 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2971 } 2972} 2973 2974void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2975 mirror::ArtMethod* method) { 2976 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2977 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2978 if (code_item == NULL) { 2979 return; // native or abstract method 2980 } 2981 if (code_item->tries_size_ == 0) { 2982 return; // nothing to process 2983 } 2984 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2985 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2986 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2987 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2988 CatchHandlerIterator iterator(handlers_ptr); 2989 for (; iterator.HasNext(); iterator.Next()) { 2990 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2991 // unresolved exception types will be ignored by exception delivery 2992 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2993 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2994 if (exception_type == NULL) { 2995 DCHECK(Thread::Current()->IsExceptionPending()); 2996 Thread::Current()->ClearException(); 2997 } 2998 } 2999 } 3000 handlers_ptr = iterator.EndDataPointer(); 3001 } 3002} 3003 3004static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3005static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3006 Handle<mirror::ArtMethod> prototype); 3007 3008mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3009 jobjectArray interfaces, jobject loader, 3010 jobjectArray methods, jobjectArray throws) { 3011 Thread* self = soa.Self(); 3012 StackHandleScope<8> hs(self); 3013 Handle<mirror::Class> klass(hs.NewHandle( 3014 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3015 if (klass.Get() == NULL) { 3016 CHECK(self->IsExceptionPending()); // OOME. 3017 return NULL; 3018 } 3019 DCHECK(klass->GetClass() != NULL); 3020 klass->SetObjectSize(sizeof(mirror::Proxy)); 3021 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 3022 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3023 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3024 klass->SetName(soa.Decode<mirror::String*>(name)); 3025 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3026 klass->SetDexCache(proxy_class->GetDexCache()); 3027 klass->SetStatus(mirror::Class::kStatusIdx, self); 3028 3029 // Instance fields are inherited, but we add a couple of static fields... 3030 { 3031 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3032 if (UNLIKELY(sfields == NULL)) { 3033 CHECK(self->IsExceptionPending()); // OOME. 3034 return NULL; 3035 } 3036 klass->SetSFields(sfields); 3037 } 3038 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3039 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3040 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3041 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3042 CHECK(self->IsExceptionPending()); // OOME. 3043 return nullptr; 3044 } 3045 klass->SetStaticField(0, interfaces_sfield.Get()); 3046 interfaces_sfield->SetDexFieldIndex(0); 3047 interfaces_sfield->SetDeclaringClass(klass.Get()); 3048 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3049 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3050 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3051 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3052 CHECK(self->IsExceptionPending()); // OOME. 3053 return nullptr; 3054 } 3055 klass->SetStaticField(1, throws_sfield.Get()); 3056 throws_sfield->SetDexFieldIndex(1); 3057 throws_sfield->SetDeclaringClass(klass.Get()); 3058 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3059 3060 // Proxies have 1 direct method, the constructor 3061 { 3062 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3063 if (UNLIKELY(directs == nullptr)) { 3064 CHECK(self->IsExceptionPending()); // OOME. 3065 return nullptr; 3066 } 3067 klass->SetDirectMethods(directs); 3068 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3069 if (UNLIKELY(constructor == nullptr)) { 3070 CHECK(self->IsExceptionPending()); // OOME. 3071 return nullptr; 3072 } 3073 klass->SetDirectMethod(0, constructor); 3074 } 3075 3076 // Create virtual method using specified prototypes. 3077 size_t num_virtual_methods = 3078 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3079 { 3080 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3081 num_virtual_methods); 3082 if (UNLIKELY(virtuals == NULL)) { 3083 CHECK(self->IsExceptionPending()); // OOME. 3084 return NULL; 3085 } 3086 klass->SetVirtualMethods(virtuals); 3087 } 3088 for (size_t i = 0; i < num_virtual_methods; ++i) { 3089 StackHandleScope<1> hs(self); 3090 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3091 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3092 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3093 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3094 if (UNLIKELY(clone == nullptr)) { 3095 CHECK(self->IsExceptionPending()); // OOME. 3096 return nullptr; 3097 } 3098 klass->SetVirtualMethod(i, clone); 3099 } 3100 3101 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3102 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3103 self->AssertNoPendingException(); 3104 3105 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3106 mirror::Class* new_class = nullptr; 3107 { 3108 ObjectLock<mirror::Class> resolution_lock(self, klass); // Must hold lock on object when resolved. 3109 // Link the fields and virtual methods, creating vtable and iftables 3110 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3111 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3112 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3113 klass->SetStatus(mirror::Class::kStatusError, self); 3114 return nullptr; 3115 } 3116 } 3117 3118 CHECK(klass->IsRetired()); 3119 CHECK_NE(klass.Get(), new_class); 3120 klass.Assign(new_class); 3121 3122 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3123 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3124 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3125 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3126 3127 { 3128 // Lock on klass is released. Lock new class object. 3129 ObjectLock<mirror::Class> initialization_lock(self, klass); 3130 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3131 } 3132 3133 // sanity checks 3134 if (kIsDebugBuild) { 3135 CHECK(klass->GetIFields() == nullptr); 3136 CheckProxyConstructor(klass->GetDirectMethod(0)); 3137 for (size_t i = 0; i < num_virtual_methods; ++i) { 3138 StackHandleScope<2> hs(self); 3139 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3140 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3141 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3142 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3143 CheckProxyMethod(virtual_method, prototype); 3144 } 3145 3146 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3147 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3148 decoded_name->ToModifiedUtf8().c_str())); 3149 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3150 3151 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3152 decoded_name->ToModifiedUtf8().c_str())); 3153 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3154 3155 CHECK_EQ(klass.Get()->GetInterfaces(), 3156 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3157 CHECK_EQ(klass.Get()->GetThrows(), 3158 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3159 } 3160 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3161 CHECK(existing == nullptr); 3162 return klass.Get(); 3163} 3164 3165std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3166 DCHECK(proxy_class->IsProxyClass()); 3167 mirror::String* name = proxy_class->GetName(); 3168 DCHECK(name != NULL); 3169 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3170} 3171 3172mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3173 mirror::ArtMethod* proxy_method) { 3174 DCHECK(proxy_class->IsProxyClass()); 3175 DCHECK(proxy_method->IsProxyMethod()); 3176 // Locate the dex cache of the original interface/Object 3177 mirror::DexCache* dex_cache = NULL; 3178 { 3179 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 3180 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3181 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3182 mirror::DexCache* a_dex_cache = GetDexCache(i); 3183 if (a_dex_cache->GetResolvedTypes() == resolved_types) { 3184 dex_cache = a_dex_cache; 3185 break; 3186 } 3187 } 3188 } 3189 CHECK(dex_cache != NULL); 3190 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3191 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3192 CHECK(resolved_method != NULL); 3193 return resolved_method; 3194} 3195 3196 3197mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3198 Handle<mirror::Class> klass, 3199 mirror::Class* proxy_class) { 3200 // Create constructor for Proxy that must initialize h 3201 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3202 proxy_class->GetDirectMethods(); 3203 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3204 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3205 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3206 // code_ too) 3207 mirror::ArtMethod* constructor = 3208 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3209 if (constructor == NULL) { 3210 CHECK(self->IsExceptionPending()); // OOME. 3211 return NULL; 3212 } 3213 // Make this constructor public and fix the class to be our Proxy version 3214 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3215 constructor->SetDeclaringClass(klass.Get()); 3216 return constructor; 3217} 3218 3219static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3220 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3221 CHECK(constructor->IsConstructor()); 3222 CHECK_STREQ(constructor->GetName(), "<init>"); 3223 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3224 "(Ljava/lang/reflect/InvocationHandler;)V"); 3225 DCHECK(constructor->IsPublic()); 3226} 3227 3228mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3229 Handle<mirror::Class> klass, 3230 Handle<mirror::ArtMethod> prototype) { 3231 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3232 // prototype method 3233 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3234 prototype.Get()); 3235 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3236 // as necessary 3237 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3238 if (UNLIKELY(method == NULL)) { 3239 CHECK(self->IsExceptionPending()); // OOME. 3240 return NULL; 3241 } 3242 3243 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3244 // the intersection of throw exceptions as defined in Proxy 3245 method->SetDeclaringClass(klass.Get()); 3246 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3247 3248 // At runtime the method looks like a reference and argument saving method, clone the code 3249 // related parameters from this method. 3250 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3251 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3252 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3253 3254 return method; 3255} 3256 3257static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3258 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3259 // Basic sanity 3260 CHECK(!prototype->IsFinal()); 3261 CHECK(method->IsFinal()); 3262 CHECK(!method->IsAbstract()); 3263 3264 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3265 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3266 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3267 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 3268 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 3269 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3270 3271 MethodHelper mh(method); 3272 MethodHelper mh2(prototype); 3273 CHECK_STREQ(method->GetName(), prototype->GetName()); 3274 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3275 // More complex sanity - via dex cache 3276 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3277} 3278 3279static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3280 bool can_init_parents) 3281 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3282 if (can_init_statics && can_init_parents) { 3283 return true; 3284 } 3285 if (!can_init_statics) { 3286 // Check if there's a class initializer. 3287 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3288 if (clinit != NULL) { 3289 return false; 3290 } 3291 // Check if there are encoded static values needing initialization. 3292 if (klass->NumStaticFields() != 0) { 3293 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3294 DCHECK(dex_class_def != NULL); 3295 if (dex_class_def->static_values_off_ != 0) { 3296 return false; 3297 } 3298 } 3299 } 3300 if (!klass->IsInterface() && klass->HasSuperClass()) { 3301 mirror::Class* super_class = klass->GetSuperClass(); 3302 if (!can_init_parents && !super_class->IsInitialized()) { 3303 return false; 3304 } else { 3305 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3306 return false; 3307 } 3308 } 3309 } 3310 return true; 3311} 3312 3313bool ClassLinker::IsInitialized() const { 3314 return init_done_; 3315} 3316 3317bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3318 bool can_init_parents) { 3319 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3320 3321 // Are we already initialized and therefore done? 3322 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3323 // an initialized class will never change its state. 3324 if (klass->IsInitialized()) { 3325 return true; 3326 } 3327 3328 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3329 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3330 return false; 3331 } 3332 3333 Thread* self = Thread::Current(); 3334 uint64_t t0; 3335 { 3336 ObjectLock<mirror::Class> lock(self, klass); 3337 3338 // Re-check under the lock in case another thread initialized ahead of us. 3339 if (klass->IsInitialized()) { 3340 return true; 3341 } 3342 3343 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3344 if (klass->IsErroneous()) { 3345 ThrowEarlierClassFailure(klass.Get()); 3346 return false; 3347 } 3348 3349 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3350 3351 if (!klass->IsVerified()) { 3352 VerifyClass(klass); 3353 if (!klass->IsVerified()) { 3354 // We failed to verify, expect either the klass to be erroneous or verification failed at 3355 // compile time. 3356 if (klass->IsErroneous()) { 3357 CHECK(self->IsExceptionPending()); 3358 } else { 3359 CHECK(Runtime::Current()->IsCompiler()); 3360 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3361 } 3362 return false; 3363 } 3364 } 3365 3366 // If the class is kStatusInitializing, either this thread is 3367 // initializing higher up the stack or another thread has beat us 3368 // to initializing and we need to wait. Either way, this 3369 // invocation of InitializeClass will not be responsible for 3370 // running <clinit> and will return. 3371 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3372 // We caught somebody else in the act; was it us? 3373 if (klass->GetClinitThreadId() == self->GetTid()) { 3374 // Yes. That's fine. Return so we can continue initializing. 3375 return true; 3376 } 3377 // No. That's fine. Wait for another thread to finish initializing. 3378 return WaitForInitializeClass(klass, self, lock); 3379 } 3380 3381 if (!ValidateSuperClassDescriptors(klass)) { 3382 klass->SetStatus(mirror::Class::kStatusError, self); 3383 return false; 3384 } 3385 3386 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3387 3388 // From here out other threads may observe that we're initializing and so changes of state 3389 // require the a notification. 3390 klass->SetClinitThreadId(self->GetTid()); 3391 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3392 3393 t0 = NanoTime(); 3394 } 3395 3396 // Initialize super classes, must be done while initializing for the JLS. 3397 if (!klass->IsInterface() && klass->HasSuperClass()) { 3398 mirror::Class* super_class = klass->GetSuperClass(); 3399 if (!super_class->IsInitialized()) { 3400 CHECK(!super_class->IsInterface()); 3401 CHECK(can_init_parents); 3402 StackHandleScope<1> hs(self); 3403 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3404 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3405 if (!super_initialized) { 3406 // The super class was verified ahead of entering initializing, we should only be here if 3407 // the super class became erroneous due to initialization. 3408 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3409 << "Super class initialization failed for " 3410 << PrettyDescriptor(handle_scope_super.Get()) 3411 << " that has unexpected status " << handle_scope_super->GetStatus() 3412 << "\nPending exception:\n" 3413 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3414 ObjectLock<mirror::Class> lock(self, klass); 3415 // Initialization failed because the super-class is erroneous. 3416 klass->SetStatus(mirror::Class::kStatusError, self); 3417 return false; 3418 } 3419 } 3420 } 3421 3422 if (klass->NumStaticFields() > 0) { 3423 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3424 CHECK(dex_class_def != NULL); 3425 const DexFile& dex_file = klass->GetDexFile(); 3426 StackHandleScope<2> hs(self); 3427 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3428 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3429 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3430 this, *dex_class_def); 3431 if (it.HasNext()) { 3432 CHECK(can_init_statics); 3433 // We reordered the fields, so we need to be able to map the 3434 // field indexes to the right fields. 3435 SafeMap<uint32_t, mirror::ArtField*> field_map; 3436 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3437 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3438 if (Runtime::Current()->IsActiveTransaction()) { 3439 it.ReadValueToField<true>(field_map.Get(i)); 3440 } else { 3441 it.ReadValueToField<false>(field_map.Get(i)); 3442 } 3443 } 3444 } 3445 } 3446 3447 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3448 if (clinit != NULL) { 3449 CHECK(can_init_statics); 3450 JValue result; 3451 clinit->Invoke(self, NULL, 0, &result, "V"); 3452 } 3453 3454 uint64_t t1 = NanoTime(); 3455 3456 bool success = true; 3457 { 3458 ObjectLock<mirror::Class> lock(self, klass); 3459 3460 if (self->IsExceptionPending()) { 3461 WrapExceptionInInitializer(); 3462 klass->SetStatus(mirror::Class::kStatusError, self); 3463 success = false; 3464 } else { 3465 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3466 RuntimeStats* thread_stats = self->GetStats(); 3467 ++global_stats->class_init_count; 3468 ++thread_stats->class_init_count; 3469 global_stats->class_init_time_ns += (t1 - t0); 3470 thread_stats->class_init_time_ns += (t1 - t0); 3471 // Set the class as initialized except if failed to initialize static fields. 3472 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3473 if (VLOG_IS_ON(class_linker)) { 3474 LOG(INFO) << "Initialized class " << klass->GetDescriptor() << " from " << 3475 klass->GetLocation(); 3476 } 3477 // Opportunistically set static method trampolines to their destination. 3478 FixupStaticTrampolines(klass.Get()); 3479 } 3480 } 3481 return success; 3482} 3483 3484bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3485 ObjectLock<mirror::Class>& lock) 3486 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3487 while (true) { 3488 self->AssertNoPendingException(); 3489 CHECK(!klass->IsInitialized()); 3490 lock.WaitIgnoringInterrupts(); 3491 3492 // When we wake up, repeat the test for init-in-progress. If 3493 // there's an exception pending (only possible if 3494 // "interruptShouldThrow" was set), bail out. 3495 if (self->IsExceptionPending()) { 3496 WrapExceptionInInitializer(); 3497 klass->SetStatus(mirror::Class::kStatusError, self); 3498 return false; 3499 } 3500 // Spurious wakeup? Go back to waiting. 3501 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3502 continue; 3503 } 3504 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3505 // Compile time initialization failed. 3506 return false; 3507 } 3508 if (klass->IsErroneous()) { 3509 // The caller wants an exception, but it was thrown in a 3510 // different thread. Synthesize one here. 3511 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3512 PrettyDescriptor(klass.Get()).c_str()); 3513 return false; 3514 } 3515 if (klass->IsInitialized()) { 3516 return true; 3517 } 3518 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 3519 << klass->GetStatus(); 3520 } 3521 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 3522} 3523 3524bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 3525 if (klass->IsInterface()) { 3526 return true; 3527 } 3528 // Begin with the methods local to the superclass. 3529 StackHandleScope<2> hs(Thread::Current()); 3530 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3531 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3532 if (klass->HasSuperClass() && 3533 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3534 for (int i = klass->GetSuperClass()->GetVTable()->GetLength() - 1; i >= 0; --i) { 3535 mh.ChangeMethod(klass->GetVTable()->GetWithoutChecks(i)); 3536 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTable()->GetWithoutChecks(i)); 3537 if (mh.GetMethod() != super_mh.GetMethod() && 3538 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3539 ThrowLinkageError(klass.Get(), 3540 "Class %s method %s resolves differently in superclass %s", 3541 PrettyDescriptor(klass.Get()).c_str(), 3542 PrettyMethod(mh.GetMethod()).c_str(), 3543 PrettyDescriptor(klass->GetSuperClass()).c_str()); 3544 return false; 3545 } 3546 } 3547 } 3548 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3549 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 3550 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 3551 for (uint32_t j = 0; j < num_methods; ++j) { 3552 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 3553 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 3554 if (mh.GetMethod() != super_mh.GetMethod() && 3555 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3556 ThrowLinkageError(klass.Get(), 3557 "Class %s method %s resolves differently in interface %s", 3558 PrettyDescriptor(klass.Get()).c_str(), 3559 PrettyMethod(mh.GetMethod()).c_str(), 3560 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 3561 return false; 3562 } 3563 } 3564 } 3565 } 3566 return true; 3567} 3568 3569bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 3570 bool can_init_parents) { 3571 DCHECK(c.Get() != nullptr); 3572 const bool success = c->IsInitialized() || InitializeClass(c, can_init_fields, can_init_parents); 3573 if (!success && can_init_fields && can_init_parents) { 3574 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.Get()); 3575 } 3576 return success; 3577} 3578 3579void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3580 mirror::Class* c, 3581 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3582 const byte* class_data = dex_file.GetClassData(dex_class_def); 3583 ClassDataItemIterator it(dex_file, class_data); 3584 StackHandleScope<2> hs(Thread::Current()); 3585 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 3586 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 3587 CHECK(!kMovingFields); 3588 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3589 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3590 } 3591} 3592 3593void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 3594 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 3595 if (fields != nullptr) { 3596 for (int index = 0; index < fields->GetLength(); index ++) { 3597 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 3598 fields->Get(index)->SetDeclaringClass(new_class); 3599 } 3600 } 3601 } 3602 3603 fields = new_class->GetSFields(); 3604 if (fields != nullptr) { 3605 for (int index = 0; index < fields->GetLength(); index ++) { 3606 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 3607 fields->Get(index)->SetDeclaringClass(new_class); 3608 } 3609 } 3610 } 3611 3612 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 3613 if (methods != nullptr) { 3614 for (int index = 0; index < methods->GetLength(); index ++) { 3615 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 3616 methods->Get(index)->SetDeclaringClass(new_class); 3617 } 3618 } 3619 } 3620 3621 methods = new_class->GetVirtualMethods(); 3622 if (methods != nullptr) { 3623 for (int index = 0; index < methods->GetLength(); index ++) { 3624 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 3625 methods->Get(index)->SetDeclaringClass(new_class); 3626 } 3627 } 3628 } 3629} 3630 3631bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 3632 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 3633 mirror::Class** new_class) { 3634 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3635 3636 if (!LinkSuperClass(klass)) { 3637 return false; 3638 } 3639 if (!LinkMethods(self, klass, interfaces)) { 3640 return false; 3641 } 3642 if (!LinkInstanceFields(klass)) { 3643 return false; 3644 } 3645 size_t class_size; 3646 if (!LinkStaticFields(klass, &class_size)) { 3647 return false; 3648 } 3649 CreateReferenceInstanceOffsets(klass); 3650 CreateReferenceStaticOffsets(klass); 3651 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3652 3653 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 3654 // We don't need to retire this class as it has no embedded tables or it was created the 3655 // correct size during class linker initialization. 3656 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 3657 3658 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 3659 klass->PopulateEmbeddedImtAndVTable(); 3660 } 3661 3662 // This will notify waiters on klass that saw the not yet resolved 3663 // class in the class_table_ during EnsureResolved. 3664 klass->SetStatus(mirror::Class::kStatusResolved, self); 3665 *new_class = klass.Get(); 3666 } else { 3667 CHECK(!klass->IsResolved()); 3668 // Retire the temporary class and create the correctly sized resolved class. 3669 *new_class = klass->CopyOf(self, class_size); 3670 if (UNLIKELY(*new_class == NULL)) { 3671 CHECK(self->IsExceptionPending()); // Expect an OOME. 3672 klass->SetStatus(mirror::Class::kStatusError, self); 3673 return false; 3674 } 3675 3676 CHECK_EQ((*new_class)->GetClassSize(), class_size); 3677 StackHandleScope<1> hs(self); 3678 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 3679 ObjectLock<mirror::Class> lock(self, new_class_h); 3680 3681 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 3682 3683 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 3684 CHECK(existing == NULL || existing == klass.Get()); 3685 3686 // This will notify waiters on temp class that saw the not yet resolved class in the 3687 // class_table_ during EnsureResolved. 3688 klass->SetStatus(mirror::Class::kStatusRetired, self); 3689 3690 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 3691 // This will notify waiters on new_class that saw the not yet resolved 3692 // class in the class_table_ during EnsureResolved. 3693 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 3694 3695 // Only embedded imt should be used from this point. 3696 new_class_h->SetImTable(NULL); 3697 // TODO: remove vtable and only use embedded vtable. 3698 } 3699 return true; 3700} 3701 3702bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 3703 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3704 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3705 uint16_t super_class_idx = class_def.superclass_idx_; 3706 if (super_class_idx != DexFile::kDexNoIndex16) { 3707 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 3708 if (super_class == NULL) { 3709 DCHECK(Thread::Current()->IsExceptionPending()); 3710 return false; 3711 } 3712 // Verify 3713 if (!klass->CanAccess(super_class)) { 3714 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 3715 PrettyDescriptor(super_class).c_str(), 3716 PrettyDescriptor(klass.Get()).c_str()); 3717 return false; 3718 } 3719 CHECK(super_class->IsResolved()); 3720 klass->SetSuperClass(super_class); 3721 } 3722 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3723 if (interfaces != NULL) { 3724 for (size_t i = 0; i < interfaces->Size(); i++) { 3725 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3726 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 3727 if (interface == NULL) { 3728 DCHECK(Thread::Current()->IsExceptionPending()); 3729 return false; 3730 } 3731 // Verify 3732 if (!klass->CanAccess(interface)) { 3733 // TODO: the RI seemed to ignore this in my testing. 3734 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 3735 PrettyDescriptor(interface).c_str(), 3736 PrettyDescriptor(klass.Get()).c_str()); 3737 return false; 3738 } 3739 } 3740 } 3741 // Mark the class as loaded. 3742 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3743 return true; 3744} 3745 3746bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 3747 CHECK(!klass->IsPrimitive()); 3748 mirror::Class* super = klass->GetSuperClass(); 3749 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 3750 if (super != NULL) { 3751 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 3752 return false; 3753 } 3754 return true; 3755 } 3756 if (super == NULL) { 3757 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 3758 PrettyDescriptor(klass.Get()).c_str()); 3759 return false; 3760 } 3761 // Verify 3762 if (super->IsFinal() || super->IsInterface()) { 3763 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 3764 PrettyDescriptor(super).c_str(), 3765 PrettyDescriptor(klass.Get()).c_str(), 3766 super->IsFinal() ? "declared final" : "an interface"); 3767 return false; 3768 } 3769 if (!klass->CanAccess(super)) { 3770 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 3771 PrettyDescriptor(super).c_str(), 3772 PrettyDescriptor(klass.Get()).c_str()); 3773 return false; 3774 } 3775 3776 // Inherit kAccClassIsFinalizable from the superclass in case this 3777 // class doesn't override finalize. 3778 if (super->IsFinalizable()) { 3779 klass->SetFinalizable(); 3780 } 3781 3782 // Inherit reference flags (if any) from the superclass. 3783 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3784 if (reference_flags != 0) { 3785 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3786 } 3787 // Disallow custom direct subclasses of java.lang.ref.Reference. 3788 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3789 ThrowLinkageError(klass.Get(), 3790 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3791 PrettyDescriptor(klass.Get()).c_str()); 3792 return false; 3793 } 3794 3795 if (kIsDebugBuild) { 3796 // Ensure super classes are fully resolved prior to resolving fields.. 3797 while (super != NULL) { 3798 CHECK(super->IsResolved()); 3799 super = super->GetSuperClass(); 3800 } 3801 } 3802 return true; 3803} 3804 3805// Populate the class vtable and itable. Compute return type indices. 3806bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 3807 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3808 if (klass->IsInterface()) { 3809 // No vtable. 3810 size_t count = klass->NumVirtualMethods(); 3811 if (!IsUint(16, count)) { 3812 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 3813 return false; 3814 } 3815 for (size_t i = 0; i < count; ++i) { 3816 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3817 } 3818 // Link interface method tables 3819 return LinkInterfaceMethods(klass, interfaces); 3820 } else { 3821 // Link virtual and interface method tables 3822 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 3823 } 3824 return true; 3825} 3826 3827bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 3828 if (klass->HasSuperClass()) { 3829 uint32_t max_count = klass->NumVirtualMethods() + 3830 klass->GetSuperClass()->GetVTable()->GetLength(); 3831 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3832 CHECK_LE(actual_count, max_count); 3833 // TODO: do not assign to the vtable field until it is fully constructed. 3834 StackHandleScope<3> hs(self); 3835 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3836 hs.NewHandle(klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count))); 3837 if (UNLIKELY(vtable.Get() == NULL)) { 3838 CHECK(self->IsExceptionPending()); // OOME. 3839 return false; 3840 } 3841 // See if any of our virtual methods override the superclass. 3842 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3843 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3844 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3845 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3846 local_mh.ChangeMethod(local_method); 3847 size_t j = 0; 3848 for (; j < actual_count; ++j) { 3849 mirror::ArtMethod* super_method = vtable->Get(j); 3850 super_mh.ChangeMethod(super_method); 3851 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3852 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 3853 super_method->GetAccessFlags())) { 3854 if (super_method->IsFinal()) { 3855 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 3856 PrettyMethod(local_method).c_str(), 3857 super_method->GetDeclaringClassDescriptor()); 3858 return false; 3859 } 3860 vtable->Set<false>(j, local_method); 3861 local_method->SetMethodIndex(j); 3862 break; 3863 } else { 3864 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3865 << " would have incorrectly overridden the package-private method in " 3866 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 3867 } 3868 } 3869 } 3870 if (j == actual_count) { 3871 // Not overriding, append. 3872 vtable->Set<false>(actual_count, local_method); 3873 local_method->SetMethodIndex(actual_count); 3874 actual_count += 1; 3875 } 3876 } 3877 if (!IsUint(16, actual_count)) { 3878 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 3879 return false; 3880 } 3881 // Shrink vtable if possible 3882 CHECK_LE(actual_count, max_count); 3883 if (actual_count < max_count) { 3884 vtable.Assign(vtable->CopyOf(self, actual_count)); 3885 if (UNLIKELY(vtable.Get() == NULL)) { 3886 CHECK(self->IsExceptionPending()); // OOME. 3887 return false; 3888 } 3889 } 3890 klass->SetVTable(vtable.Get()); 3891 } else { 3892 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 3893 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3894 if (!IsUint(16, num_virtual_methods)) { 3895 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 3896 return false; 3897 } 3898 StackHandleScope<1> hs(self); 3899 Handle<mirror::ObjectArray<mirror::ArtMethod>> 3900 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 3901 if (UNLIKELY(vtable.Get() == NULL)) { 3902 CHECK(self->IsExceptionPending()); // OOME. 3903 return false; 3904 } 3905 for (size_t i = 0; i < num_virtual_methods; ++i) { 3906 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3907 vtable->Set<false>(i, virtual_method); 3908 virtual_method->SetMethodIndex(i & 0xFFFF); 3909 } 3910 klass->SetVTable(vtable.Get()); 3911 } 3912 return true; 3913} 3914 3915bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 3916 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3917 Thread* const self = Thread::Current(); 3918 Runtime* const runtime = Runtime::Current(); 3919 // Set the imt table to be all conflicts by default. 3920 klass->SetImTable(runtime->GetDefaultImt()); 3921 size_t super_ifcount; 3922 if (klass->HasSuperClass()) { 3923 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3924 } else { 3925 super_ifcount = 0; 3926 } 3927 uint32_t num_interfaces = 3928 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 3929 size_t ifcount = super_ifcount + num_interfaces; 3930 for (size_t i = 0; i < num_interfaces; i++) { 3931 mirror::Class* interface = 3932 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 3933 interfaces->Get(i); 3934 ifcount += interface->GetIfTableCount(); 3935 } 3936 if (ifcount == 0) { 3937 // Class implements no interfaces. 3938 DCHECK_EQ(klass->GetIfTableCount(), 0); 3939 DCHECK(klass->GetIfTable() == NULL); 3940 return true; 3941 } 3942 if (ifcount == super_ifcount) { 3943 // Class implements same interfaces as parent, are any of these not marker interfaces? 3944 bool has_non_marker_interface = false; 3945 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3946 for (size_t i = 0; i < ifcount; ++i) { 3947 if (super_iftable->GetMethodArrayCount(i) > 0) { 3948 has_non_marker_interface = true; 3949 break; 3950 } 3951 } 3952 if (!has_non_marker_interface) { 3953 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3954 klass->SetIfTable(super_iftable); 3955 return true; 3956 } 3957 } 3958 StackHandleScope<4> hs(self); 3959 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 3960 if (UNLIKELY(iftable.Get() == NULL)) { 3961 CHECK(self->IsExceptionPending()); // OOME. 3962 return false; 3963 } 3964 if (super_ifcount != 0) { 3965 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3966 for (size_t i = 0; i < super_ifcount; i++) { 3967 mirror::Class* super_interface = super_iftable->GetInterface(i); 3968 iftable->SetInterface(i, super_interface); 3969 } 3970 } 3971 // Flatten the interface inheritance hierarchy. 3972 size_t idx = super_ifcount; 3973 for (size_t i = 0; i < num_interfaces; i++) { 3974 mirror::Class* interface = 3975 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 3976 interfaces->Get(i); 3977 DCHECK(interface != NULL); 3978 if (!interface->IsInterface()) { 3979 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 3980 PrettyDescriptor(klass.Get()).c_str(), 3981 PrettyDescriptor(interface->GetDescriptor()).c_str()); 3982 return false; 3983 } 3984 // Check if interface is already in iftable 3985 bool duplicate = false; 3986 for (size_t j = 0; j < idx; j++) { 3987 mirror::Class* existing_interface = iftable->GetInterface(j); 3988 if (existing_interface == interface) { 3989 duplicate = true; 3990 break; 3991 } 3992 } 3993 if (!duplicate) { 3994 // Add this non-duplicate interface. 3995 iftable->SetInterface(idx++, interface); 3996 // Add this interface's non-duplicate super-interfaces. 3997 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3998 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3999 bool super_duplicate = false; 4000 for (size_t k = 0; k < idx; k++) { 4001 mirror::Class* existing_interface = iftable->GetInterface(k); 4002 if (existing_interface == super_interface) { 4003 super_duplicate = true; 4004 break; 4005 } 4006 } 4007 if (!super_duplicate) { 4008 iftable->SetInterface(idx++, super_interface); 4009 } 4010 } 4011 } 4012 } 4013 // Shrink iftable in case duplicates were found 4014 if (idx < ifcount) { 4015 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4016 if (UNLIKELY(iftable.Get() == NULL)) { 4017 CHECK(self->IsExceptionPending()); // OOME. 4018 return false; 4019 } 4020 ifcount = idx; 4021 } else { 4022 CHECK_EQ(idx, ifcount); 4023 } 4024 klass->SetIfTable(iftable.Get()); 4025 4026 // If we're an interface, we don't need the vtable pointers, so we're done. 4027 if (klass->IsInterface()) { 4028 return true; 4029 } 4030 // Allocate imtable 4031 bool imtable_changed = false; 4032 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4033 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4034 if (UNLIKELY(imtable.Get() == NULL)) { 4035 CHECK(self->IsExceptionPending()); // OOME. 4036 return false; 4037 } 4038 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4039 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4040 std::vector<mirror::ArtMethod*> miranda_list; 4041 for (size_t i = 0; i < ifcount; ++i) { 4042 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4043 if (num_methods > 0) { 4044 StackHandleScope<2> hs(self); 4045 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4046 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4047 if (UNLIKELY(method_array.Get() == nullptr)) { 4048 CHECK(self->IsExceptionPending()); // OOME. 4049 return false; 4050 } 4051 iftable->SetMethodArray(i, method_array.Get()); 4052 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4053 hs.NewHandle(klass->GetVTableDuringLinking())); 4054 for (size_t j = 0; j < num_methods; ++j) { 4055 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 4056 interface_mh.ChangeMethod(interface_method); 4057 int32_t k; 4058 // For each method listed in the interface's method list, find the 4059 // matching method in our class's method list. We want to favor the 4060 // subclass over the superclass, which just requires walking 4061 // back from the end of the vtable. (This only matters if the 4062 // superclass defines a private method and this class redefines 4063 // it -- otherwise it would use the same vtable slot. In .dex files 4064 // those don't end up in the virtual method table, so it shouldn't 4065 // matter which direction we go. We walk it backward anyway.) 4066 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4067 mirror::ArtMethod* vtable_method = vtable->Get(k); 4068 vtable_mh.ChangeMethod(vtable_method); 4069 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4070 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 4071 ThrowIllegalAccessError( 4072 klass.Get(), 4073 "Method '%s' implementing interface method '%s' is not public", 4074 PrettyMethod(vtable_method).c_str(), 4075 PrettyMethod(interface_method).c_str()); 4076 return false; 4077 } 4078 method_array->Set<false>(j, vtable_method); 4079 // Place method in imt if entry is empty, place conflict otherwise. 4080 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4081 if (imtable->Get(imt_index) == NULL) { 4082 imtable->Set<false>(imt_index, vtable_method); 4083 imtable_changed = true; 4084 } else { 4085 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4086 } 4087 break; 4088 } 4089 } 4090 if (k < 0) { 4091 StackHandleScope<1> hs(self); 4092 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4093 for (mirror::ArtMethod* mir_method : miranda_list) { 4094 vtable_mh.ChangeMethod(mir_method); 4095 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4096 miranda_method.Assign(mir_method); 4097 break; 4098 } 4099 } 4100 if (miranda_method.Get() == NULL) { 4101 // Point the interface table at a phantom slot. 4102 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 4103 if (UNLIKELY(miranda_method.Get() == NULL)) { 4104 CHECK(self->IsExceptionPending()); // OOME. 4105 return false; 4106 } 4107 // TODO: If a methods move then the miranda_list may hold stale references. 4108 miranda_list.push_back(miranda_method.Get()); 4109 } 4110 method_array->Set<false>(j, miranda_method.Get()); 4111 } 4112 } 4113 } 4114 } 4115 if (imtable_changed) { 4116 // Fill in empty entries in interface method table with conflict. 4117 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4118 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4119 if (imtable->Get(i) == NULL) { 4120 imtable->Set<false>(i, imt_conflict_method); 4121 } 4122 } 4123 klass->SetImTable(imtable.Get()); 4124 } 4125 if (!miranda_list.empty()) { 4126 int old_method_count = klass->NumVirtualMethods(); 4127 int new_method_count = old_method_count + miranda_list.size(); 4128 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4129 if (old_method_count == 0) { 4130 virtuals = AllocArtMethodArray(self, new_method_count); 4131 } else { 4132 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4133 } 4134 if (UNLIKELY(virtuals == NULL)) { 4135 CHECK(self->IsExceptionPending()); // OOME. 4136 return false; 4137 } 4138 klass->SetVirtualMethods(virtuals); 4139 4140 StackHandleScope<1> hs(self); 4141 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4142 hs.NewHandle(klass->GetVTableDuringLinking())); 4143 CHECK(vtable.Get() != NULL); 4144 int old_vtable_count = vtable->GetLength(); 4145 int new_vtable_count = old_vtable_count + miranda_list.size(); 4146 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4147 if (UNLIKELY(vtable.Get() == NULL)) { 4148 CHECK(self->IsExceptionPending()); // OOME. 4149 return false; 4150 } 4151 for (size_t i = 0; i < miranda_list.size(); ++i) { 4152 mirror::ArtMethod* method = miranda_list[i]; 4153 // Leave the declaring class alone as type indices are relative to it 4154 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4155 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4156 klass->SetVirtualMethod(old_method_count + i, method); 4157 vtable->Set<false>(old_vtable_count + i, method); 4158 } 4159 // TODO: do not assign to the vtable field until it is fully constructed. 4160 klass->SetVTable(vtable.Get()); 4161 } 4162 4163 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4164 for (int i = 0; i < vtable->GetLength(); ++i) { 4165 CHECK(vtable->Get(i) != NULL); 4166 } 4167 4168// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4169 4170 return true; 4171} 4172 4173bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4174 CHECK(klass.Get() != NULL); 4175 return LinkFields(klass, false, nullptr); 4176} 4177 4178bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass, size_t* class_size) { 4179 CHECK(klass.Get() != NULL); 4180 return LinkFields(klass, true, class_size); 4181} 4182 4183struct LinkFieldsComparator { 4184 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4185 } 4186 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4187 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4188 NO_THREAD_SAFETY_ANALYSIS { 4189 // First come reference fields, then 64-bit, and finally 32-bit 4190 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4191 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4192 if (type1 != type2) { 4193 bool is_primitive1 = type1 != Primitive::kPrimNot; 4194 bool is_primitive2 = type2 != Primitive::kPrimNot; 4195 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4196 type1 == Primitive::kPrimDouble); 4197 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4198 type2 == Primitive::kPrimDouble); 4199 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4200 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4201 if (order1 != order2) { 4202 return order1 < order2; 4203 } 4204 } 4205 // same basic group? then sort by string. 4206 return strcmp(field1->GetName(), field2->GetName()) < 0; 4207 } 4208}; 4209 4210bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static, size_t* class_size) { 4211 size_t num_fields = 4212 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4213 4214 mirror::ObjectArray<mirror::ArtField>* fields = 4215 is_static ? klass->GetSFields() : klass->GetIFields(); 4216 4217 // Initialize field_offset 4218 MemberOffset field_offset(0); 4219 if (is_static) { 4220 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 4221 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4222 // Static fields come after the embedded tables. 4223 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 4224 0, 0, 0); 4225 } 4226 field_offset = MemberOffset(base); 4227 } else { 4228 mirror::Class* super_class = klass->GetSuperClass(); 4229 if (super_class != NULL) { 4230 CHECK(super_class->IsResolved()) 4231 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4232 field_offset = MemberOffset(super_class->GetObjectSize()); 4233 } 4234 } 4235 4236 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4237 4238 // we want a relatively stable order so that adding new fields 4239 // minimizes disruption of C++ version such as Class and Method. 4240 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4241 for (size_t i = 0; i < num_fields; i++) { 4242 mirror::ArtField* f = fields->Get(i); 4243 CHECK(f != NULL) << PrettyClass(klass.Get()); 4244 grouped_and_sorted_fields.push_back(f); 4245 } 4246 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4247 LinkFieldsComparator()); 4248 4249 // References should be at the front. 4250 size_t current_field = 0; 4251 size_t num_reference_fields = 0; 4252 for (; current_field < num_fields; current_field++) { 4253 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4254 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4255 bool isPrimitive = type != Primitive::kPrimNot; 4256 if (isPrimitive) { 4257 break; // past last reference, move on to the next phase 4258 } 4259 grouped_and_sorted_fields.pop_front(); 4260 num_reference_fields++; 4261 fields->Set<false>(current_field, field); 4262 field->SetOffset(field_offset); 4263 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4264 } 4265 4266 // Now we want to pack all of the double-wide fields together. If 4267 // we're not aligned, though, we want to shuffle one 32-bit field 4268 // into place. If we can't find one, we'll have to pad it. 4269 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4270 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4271 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4272 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4273 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4274 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4275 continue; 4276 } 4277 fields->Set<false>(current_field++, field); 4278 field->SetOffset(field_offset); 4279 // drop the consumed field 4280 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4281 break; 4282 } 4283 // whether we found a 32-bit field for padding or not, we advance 4284 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4285 } 4286 4287 // Alignment is good, shuffle any double-wide fields forward, and 4288 // finish assigning field offsets to all fields. 4289 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 4290 << PrettyClass(klass.Get()); 4291 while (!grouped_and_sorted_fields.empty()) { 4292 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4293 grouped_and_sorted_fields.pop_front(); 4294 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4295 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4296 fields->Set<false>(current_field, field); 4297 field->SetOffset(field_offset); 4298 field_offset = MemberOffset(field_offset.Uint32Value() + 4299 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4300 ? sizeof(uint64_t) 4301 : sizeof(uint32_t))); 4302 current_field++; 4303 } 4304 4305 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4306 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4307 // We know there are no non-reference fields in the Reference classes, and we know 4308 // that 'referent' is alphabetically last, so this is easy... 4309 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4310 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4311 --num_reference_fields; 4312 } 4313 4314 if (kIsDebugBuild) { 4315 // Make sure that all reference fields appear before 4316 // non-reference fields, and all double-wide fields are aligned. 4317 bool seen_non_ref = false; 4318 for (size_t i = 0; i < num_fields; i++) { 4319 mirror::ArtField* field = fields->Get(i); 4320 if (false) { // enable to debug field layout 4321 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4322 << " class=" << PrettyClass(klass.Get()) 4323 << " field=" << PrettyField(field) 4324 << " offset=" 4325 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4326 } 4327 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4328 bool is_primitive = type != Primitive::kPrimNot; 4329 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4330 strcmp("referent", field->GetName()) == 0) { 4331 is_primitive = true; // We lied above, so we have to expect a lie here. 4332 } 4333 if (is_primitive) { 4334 if (!seen_non_ref) { 4335 seen_non_ref = true; 4336 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4337 } 4338 } else { 4339 DCHECK(!seen_non_ref) << PrettyField(field); 4340 } 4341 } 4342 if (!seen_non_ref) { 4343 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4344 } 4345 } 4346 4347 size_t size = field_offset.Uint32Value(); 4348 // Update klass 4349 if (is_static) { 4350 klass->SetNumReferenceStaticFields(num_reference_fields); 4351 *class_size = size; 4352 } else { 4353 klass->SetNumReferenceInstanceFields(num_reference_fields); 4354 if (!klass->IsVariableSize()) { 4355 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(); 4356 size_t previous_size = klass->GetObjectSize(); 4357 if (previous_size != 0) { 4358 // Make sure that we didn't originally have an incorrect size. 4359 CHECK_EQ(previous_size, size) << klass->GetDescriptor(); 4360 } 4361 klass->SetObjectSize(size); 4362 } 4363 } 4364 return true; 4365} 4366 4367// Set the bitmap of reference offsets, refOffsets, from the ifields 4368// list. 4369void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4370 uint32_t reference_offsets = 0; 4371 mirror::Class* super_class = klass->GetSuperClass(); 4372 if (super_class != NULL) { 4373 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4374 // If our superclass overflowed, we don't stand a chance. 4375 if (reference_offsets == CLASS_WALK_SUPER) { 4376 klass->SetReferenceInstanceOffsets(reference_offsets); 4377 return; 4378 } 4379 } 4380 CreateReferenceOffsets(klass, false, reference_offsets); 4381} 4382 4383void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4384 CreateReferenceOffsets(klass, true, 0); 4385} 4386 4387void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4388 uint32_t reference_offsets) { 4389 size_t num_reference_fields = 4390 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4391 : klass->NumReferenceInstanceFieldsDuringLinking(); 4392 mirror::ObjectArray<mirror::ArtField>* fields = 4393 is_static ? klass->GetSFields() : klass->GetIFields(); 4394 // All of the fields that contain object references are guaranteed 4395 // to be at the beginning of the fields list. 4396 for (size_t i = 0; i < num_reference_fields; ++i) { 4397 // Note that byte_offset is the offset from the beginning of 4398 // object, not the offset into instance data 4399 mirror::ArtField* field = fields->Get(i); 4400 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4401 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4402 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4403 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4404 CHECK_NE(new_bit, 0U); 4405 reference_offsets |= new_bit; 4406 } else { 4407 reference_offsets = CLASS_WALK_SUPER; 4408 break; 4409 } 4410 } 4411 // Update fields in klass 4412 if (is_static) { 4413 klass->SetReferenceStaticOffsets(reference_offsets); 4414 } else { 4415 klass->SetReferenceInstanceOffsets(reference_offsets); 4416 } 4417} 4418 4419mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4420 Handle<mirror::DexCache> dex_cache) { 4421 DCHECK(dex_cache.Get() != nullptr); 4422 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4423 if (resolved != NULL) { 4424 return resolved; 4425 } 4426 uint32_t utf16_length; 4427 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4428 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4429 dex_cache->SetResolvedString(string_idx, string); 4430 return string; 4431} 4432 4433mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4434 mirror::Class* referrer) { 4435 StackHandleScope<2> hs(Thread::Current()); 4436 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4437 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4438 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4439} 4440 4441mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4442 Handle<mirror::DexCache> dex_cache, 4443 Handle<mirror::ClassLoader> class_loader) { 4444 DCHECK(dex_cache.Get() != NULL); 4445 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4446 if (resolved == NULL) { 4447 Thread* self = Thread::Current(); 4448 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4449 resolved = FindClass(self, descriptor, class_loader); 4450 if (resolved != NULL) { 4451 // TODO: we used to throw here if resolved's class loader was not the 4452 // boot class loader. This was to permit different classes with the 4453 // same name to be loaded simultaneously by different loaders 4454 dex_cache->SetResolvedType(type_idx, resolved); 4455 } else { 4456 CHECK(self->IsExceptionPending()) 4457 << "Expected pending exception for failed resolution of: " << descriptor; 4458 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4459 StackHandleScope<1> hs(self); 4460 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4461 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4462 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4463 self->ClearException(); 4464 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4465 self->GetException(NULL)->SetCause(cause.Get()); 4466 } 4467 } 4468 } 4469 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4470 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4471 return resolved; 4472} 4473 4474mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 4475 Handle<mirror::DexCache> dex_cache, 4476 Handle<mirror::ClassLoader> class_loader, 4477 Handle<mirror::ArtMethod> referrer, 4478 InvokeType type) { 4479 DCHECK(dex_cache.Get() != NULL); 4480 // Check for hit in the dex cache. 4481 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4482 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 4483 return resolved; 4484 } 4485 // Fail, get the declaring class. 4486 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4487 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4488 if (klass == NULL) { 4489 DCHECK(Thread::Current()->IsExceptionPending()); 4490 return NULL; 4491 } 4492 // Scan using method_idx, this saves string compares but will only hit for matching dex 4493 // caches/files. 4494 switch (type) { 4495 case kDirect: // Fall-through. 4496 case kStatic: 4497 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 4498 break; 4499 case kInterface: 4500 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 4501 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4502 break; 4503 case kSuper: // Fall-through. 4504 case kVirtual: 4505 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 4506 break; 4507 default: 4508 LOG(FATAL) << "Unreachable - invocation type: " << type; 4509 } 4510 if (resolved == NULL) { 4511 // Search by name, which works across dex files. 4512 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4513 const Signature signature = dex_file.GetMethodSignature(method_id); 4514 switch (type) { 4515 case kDirect: // Fall-through. 4516 case kStatic: 4517 resolved = klass->FindDirectMethod(name, signature); 4518 break; 4519 case kInterface: 4520 resolved = klass->FindInterfaceMethod(name, signature); 4521 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4522 break; 4523 case kSuper: // Fall-through. 4524 case kVirtual: 4525 resolved = klass->FindVirtualMethod(name, signature); 4526 break; 4527 } 4528 } 4529 if (resolved != NULL) { 4530 // We found a method, check for incompatible class changes. 4531 if (resolved->CheckIncompatibleClassChange(type)) { 4532 resolved = NULL; 4533 } 4534 } 4535 if (resolved != NULL) { 4536 // Be a good citizen and update the dex cache to speed subsequent calls. 4537 dex_cache->SetResolvedMethod(method_idx, resolved); 4538 return resolved; 4539 } else { 4540 // We failed to find the method which means either an access error, an incompatible class 4541 // change, or no such method. First try to find the method among direct and virtual methods. 4542 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4543 const Signature signature = dex_file.GetMethodSignature(method_id); 4544 switch (type) { 4545 case kDirect: 4546 case kStatic: 4547 resolved = klass->FindVirtualMethod(name, signature); 4548 break; 4549 case kInterface: 4550 case kVirtual: 4551 case kSuper: 4552 resolved = klass->FindDirectMethod(name, signature); 4553 break; 4554 } 4555 4556 // If we found something, check that it can be accessed by the referrer. 4557 if (resolved != NULL && referrer.Get() != NULL) { 4558 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4559 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4560 if (!referring_class->CanAccess(methods_class)) { 4561 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4562 resolved, type); 4563 return NULL; 4564 } else if (!referring_class->CanAccessMember(methods_class, 4565 resolved->GetAccessFlags())) { 4566 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4567 return NULL; 4568 } 4569 } 4570 4571 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4572 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4573 switch (type) { 4574 case kDirect: 4575 case kStatic: 4576 if (resolved != NULL) { 4577 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4578 } else { 4579 resolved = klass->FindInterfaceMethod(name, signature); 4580 if (resolved != NULL) { 4581 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4582 } else { 4583 ThrowNoSuchMethodError(type, klass, name, signature); 4584 } 4585 } 4586 break; 4587 case kInterface: 4588 if (resolved != NULL) { 4589 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4590 } else { 4591 resolved = klass->FindVirtualMethod(name, signature); 4592 if (resolved != NULL) { 4593 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4594 } else { 4595 ThrowNoSuchMethodError(type, klass, name, signature); 4596 } 4597 } 4598 break; 4599 case kSuper: 4600 ThrowNoSuchMethodError(type, klass, name, signature); 4601 break; 4602 case kVirtual: 4603 if (resolved != NULL) { 4604 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4605 } else { 4606 resolved = klass->FindInterfaceMethod(name, signature); 4607 if (resolved != NULL) { 4608 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4609 } else { 4610 ThrowNoSuchMethodError(type, klass, name, signature); 4611 } 4612 } 4613 break; 4614 } 4615 DCHECK(Thread::Current()->IsExceptionPending()); 4616 return NULL; 4617 } 4618} 4619 4620mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4621 Handle<mirror::DexCache> dex_cache, 4622 Handle<mirror::ClassLoader> class_loader, 4623 bool is_static) { 4624 DCHECK(dex_cache.Get() != nullptr); 4625 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4626 if (resolved != NULL) { 4627 return resolved; 4628 } 4629 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4630 Thread* const self = Thread::Current(); 4631 StackHandleScope<1> hs(self); 4632 Handle<mirror::Class> klass( 4633 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4634 if (klass.Get() == NULL) { 4635 DCHECK(Thread::Current()->IsExceptionPending()); 4636 return NULL; 4637 } 4638 4639 if (is_static) { 4640 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 4641 } else { 4642 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 4643 } 4644 4645 if (resolved == NULL) { 4646 const char* name = dex_file.GetFieldName(field_id); 4647 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4648 if (is_static) { 4649 resolved = mirror::Class::FindStaticField(self, klass, name, type); 4650 } else { 4651 resolved = klass->FindInstanceField(name, type); 4652 } 4653 if (resolved == NULL) { 4654 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 4655 return NULL; 4656 } 4657 } 4658 dex_cache->SetResolvedField(field_idx, resolved); 4659 return resolved; 4660} 4661 4662mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4663 uint32_t field_idx, 4664 Handle<mirror::DexCache> dex_cache, 4665 Handle<mirror::ClassLoader> class_loader) { 4666 DCHECK(dex_cache.Get() != nullptr); 4667 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4668 if (resolved != NULL) { 4669 return resolved; 4670 } 4671 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4672 Thread* self = Thread::Current(); 4673 StackHandleScope<1> hs(self); 4674 Handle<mirror::Class> klass( 4675 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4676 if (klass.Get() == NULL) { 4677 DCHECK(Thread::Current()->IsExceptionPending()); 4678 return NULL; 4679 } 4680 4681 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4682 StringPiece type(dex_file.StringDataByIdx( 4683 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4684 resolved = mirror::Class::FindField(self, klass, name, type); 4685 if (resolved != NULL) { 4686 dex_cache->SetResolvedField(field_idx, resolved); 4687 } else { 4688 ThrowNoSuchFieldError("", klass.Get(), type, name); 4689 } 4690 return resolved; 4691} 4692 4693const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4694 uint32_t* length) { 4695 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4696 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4697 const DexFile& dex_file = *dex_cache->GetDexFile(); 4698 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4699 return dex_file.GetMethodShorty(method_id, length); 4700} 4701 4702void ClassLinker::DumpAllClasses(int flags) { 4703 if (dex_cache_image_class_lookup_required_) { 4704 MoveImageClassesToClassTable(); 4705 } 4706 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4707 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4708 std::vector<mirror::Class*> all_classes; 4709 { 4710 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4711 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 4712 mirror::Class** root = &it.second; 4713 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 4714 all_classes.push_back(klass); 4715 } 4716 } 4717 4718 for (size_t i = 0; i < all_classes.size(); ++i) { 4719 all_classes[i]->DumpClass(std::cerr, flags); 4720 } 4721} 4722 4723void ClassLinker::DumpForSigQuit(std::ostream& os) { 4724 if (dex_cache_image_class_lookup_required_) { 4725 MoveImageClassesToClassTable(); 4726 } 4727 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4728 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4729} 4730 4731size_t ClassLinker::NumLoadedClasses() { 4732 if (dex_cache_image_class_lookup_required_) { 4733 MoveImageClassesToClassTable(); 4734 } 4735 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4736 return class_table_.size(); 4737} 4738 4739pid_t ClassLinker::GetClassesLockOwner() { 4740 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4741} 4742 4743pid_t ClassLinker::GetDexLockOwner() { 4744 return dex_lock_.GetExclusiveOwnerTid(); 4745} 4746 4747void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4748 DCHECK(!init_done_); 4749 4750 DCHECK(klass != NULL); 4751 DCHECK(klass->GetClassLoader() == NULL); 4752 4753 mirror::ObjectArray<mirror::Class>* class_roots = 4754 ReadBarrier::BarrierForRoot<mirror::ObjectArray<mirror::Class>, kWithReadBarrier>( 4755 &class_roots_); 4756 DCHECK(class_roots != NULL); 4757 DCHECK(class_roots->Get(class_root) == NULL); 4758 class_roots->Set<false>(class_root, klass); 4759} 4760 4761} // namespace art 4762