class_linker.cc revision 0a112bbbcd761c749c346bfec0ec39c1ef37a590
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_root-inl.h" 38#include "gc/accounting/card_table-inl.h" 39#include "gc/accounting/heap_bitmap.h" 40#include "gc/heap.h" 41#include "gc/space/image_space.h" 42#include "handle_scope.h" 43#include "intern_table.h" 44#include "interpreter/interpreter.h" 45#include "leb128.h" 46#include "method_helper-inl.h" 47#include "oat.h" 48#include "oat_file.h" 49#include "object_lock.h" 50#include "mirror/art_field-inl.h" 51#include "mirror/art_method-inl.h" 52#include "mirror/class.h" 53#include "mirror/class-inl.h" 54#include "mirror/class_loader.h" 55#include "mirror/dex_cache-inl.h" 56#include "mirror/iftable-inl.h" 57#include "mirror/object-inl.h" 58#include "mirror/object_array-inl.h" 59#include "mirror/proxy.h" 60#include "mirror/reference-inl.h" 61#include "mirror/stack_trace_element.h" 62#include "mirror/string-inl.h" 63#include "os.h" 64#include "runtime.h" 65#include "entrypoints/entrypoint_utils.h" 66#include "ScopedLocalRef.h" 67#include "scoped_thread_state_change.h" 68#include "handle_scope-inl.h" 69#include "thread.h" 70#include "utils.h" 71#include "verifier/method_verifier.h" 72#include "well_known_classes.h" 73 74namespace art { 75 76static void ThrowNoClassDefFoundError(const char* fmt, ...) 77 __attribute__((__format__(__printf__, 1, 2))) 78 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 79static void ThrowNoClassDefFoundError(const char* fmt, ...) { 80 va_list args; 81 va_start(args, fmt); 82 Thread* self = Thread::Current(); 83 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 84 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 85 va_end(args); 86} 87 88static void ThrowEarlierClassFailure(mirror::Class* c) 89 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 90 // The class failed to initialize on a previous attempt, so we want to throw 91 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 92 // failed in verification, in which case v2 5.4.1 says we need to re-throw 93 // the previous error. 94 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 95 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 96 } 97 98 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 99 Thread* self = Thread::Current(); 100 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 101 if (c->GetVerifyErrorClass() != NULL) { 102 // TODO: change the verifier to store an _instance_, with a useful detail message? 103 std::string temp; 104 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 105 PrettyDescriptor(c).c_str()); 106 } else { 107 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 108 PrettyDescriptor(c).c_str()); 109 } 110} 111 112static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 113 Thread* self = Thread::Current(); 114 JNIEnv* env = self->GetJniEnv(); 115 116 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 117 CHECK(cause.get() != NULL); 118 119 env->ExceptionClear(); 120 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 121 env->Throw(cause.get()); 122 123 // We only wrap non-Error exceptions; an Error can just be used as-is. 124 if (!is_error) { 125 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 126 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 127 } 128} 129 130static size_t Hash(const char* s) { 131 // This is the java.lang.String hashcode for convenience, not interoperability. 132 size_t hash = 0; 133 for (; *s != '\0'; ++s) { 134 hash = hash * 31 + *s; 135 } 136 return hash; 137} 138 139const char* ClassLinker::class_roots_descriptors_[] = { 140 "Ljava/lang/Class;", 141 "Ljava/lang/Object;", 142 "[Ljava/lang/Class;", 143 "[Ljava/lang/Object;", 144 "Ljava/lang/String;", 145 "Ljava/lang/DexCache;", 146 "Ljava/lang/ref/Reference;", 147 "Ljava/lang/reflect/ArtField;", 148 "Ljava/lang/reflect/ArtMethod;", 149 "Ljava/lang/reflect/Proxy;", 150 "[Ljava/lang/String;", 151 "[Ljava/lang/reflect/ArtField;", 152 "[Ljava/lang/reflect/ArtMethod;", 153 "Ljava/lang/ClassLoader;", 154 "Ljava/lang/Throwable;", 155 "Ljava/lang/ClassNotFoundException;", 156 "Ljava/lang/StackTraceElement;", 157 "Z", 158 "B", 159 "C", 160 "D", 161 "F", 162 "I", 163 "J", 164 "S", 165 "V", 166 "[Z", 167 "[B", 168 "[C", 169 "[D", 170 "[F", 171 "[I", 172 "[J", 173 "[S", 174 "[Ljava/lang/StackTraceElement;", 175}; 176 177ClassLinker::ClassLinker(InternTable* intern_table) 178 // dex_lock_ is recursive as it may be used in stack dumping. 179 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 180 dex_cache_image_class_lookup_required_(false), 181 failed_dex_cache_class_lookups_(0), 182 class_roots_(nullptr), 183 array_iftable_(nullptr), 184 find_array_class_cache_next_victim_(0), 185 init_done_(false), 186 log_new_dex_caches_roots_(false), 187 log_new_class_table_roots_(false), 188 intern_table_(intern_table), 189 portable_resolution_trampoline_(nullptr), 190 quick_resolution_trampoline_(nullptr), 191 portable_imt_conflict_trampoline_(nullptr), 192 quick_imt_conflict_trampoline_(nullptr), 193 quick_generic_jni_trampoline_(nullptr), 194 quick_to_interpreter_bridge_trampoline_(nullptr) { 195 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 196 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 197} 198 199// To set a value for generic JNI. May be necessary in compiler tests. 200extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 201 202void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 203 VLOG(startup) << "ClassLinker::Init"; 204 CHECK(Runtime::Current()->IsCompiler()); 205 206 CHECK(!init_done_); 207 208 // java_lang_Class comes first, it's needed for AllocClass 209 Thread* self = Thread::Current(); 210 gc::Heap* heap = Runtime::Current()->GetHeap(); 211 // The GC can't handle an object with a null class since we can't get the size of this object. 212 heap->IncrementDisableMovingGC(self); 213 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 214 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 215 heap->AllocNonMovableObject<true>(self, nullptr, 216 mirror::Class::ClassClassSize(), 217 VoidFunctor())))); 218 CHECK(java_lang_Class.Get() != NULL); 219 mirror::Class::SetClassClass(java_lang_Class.Get()); 220 java_lang_Class->SetClass(java_lang_Class.Get()); 221 if (kUseBakerOrBrooksReadBarrier) { 222 java_lang_Class->AssertReadBarrierPointer(); 223 } 224 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 225 heap->DecrementDisableMovingGC(self); 226 // AllocClass(mirror::Class*) can now be used 227 228 // Class[] is used for reflection support. 229 Handle<mirror::Class> class_array_class(hs.NewHandle( 230 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 231 class_array_class->SetComponentType(java_lang_Class.Get()); 232 233 // java_lang_Object comes next so that object_array_class can be created. 234 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 235 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 236 CHECK(java_lang_Object.Get() != NULL); 237 // backfill Object as the super class of Class. 238 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 239 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 240 241 // Object[] next to hold class roots. 242 Handle<mirror::Class> object_array_class(hs.NewHandle( 243 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 244 object_array_class->SetComponentType(java_lang_Object.Get()); 245 246 // Setup the char (primitive) class to be used for char[]. 247 Handle<mirror::Class> char_class(hs.NewHandle( 248 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 249 250 // Setup the char[] class to be used for String. 251 Handle<mirror::Class> char_array_class(hs.NewHandle( 252 AllocClass(self, java_lang_Class.Get(), 253 mirror::Array::ClassSize()))); 254 char_array_class->SetComponentType(char_class.Get()); 255 mirror::CharArray::SetArrayClass(char_array_class.Get()); 256 257 // Setup String. 258 Handle<mirror::Class> java_lang_String(hs.NewHandle( 259 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 260 mirror::String::SetClass(java_lang_String.Get()); 261 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 262 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 263 264 // Setup Reference. 265 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 266 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 267 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 268 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 269 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 270 271 // Create storage for root classes, save away our work so far (requires descriptors). 272 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 273 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 274 kClassRootsMax)); 275 CHECK(!class_roots_.IsNull()); 276 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 277 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 278 SetClassRoot(kClassArrayClass, class_array_class.Get()); 279 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 280 SetClassRoot(kCharArrayClass, char_array_class.Get()); 281 SetClassRoot(kJavaLangString, java_lang_String.Get()); 282 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 283 284 // Setup the primitive type classes. 285 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 286 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 287 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 288 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 289 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 290 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 291 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 292 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 293 294 // Create array interface entries to populate once we can load system classes. 295 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 296 297 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 298 Handle<mirror::Class> int_array_class(hs.NewHandle( 299 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 300 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 301 mirror::IntArray::SetArrayClass(int_array_class.Get()); 302 SetClassRoot(kIntArrayClass, int_array_class.Get()); 303 304 // now that these are registered, we can use AllocClass() and AllocObjectArray 305 306 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 307 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 308 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 309 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 310 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 311 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 312 313 // Constructor, Field, Method, and AbstractMethod are necessary so 314 // that FindClass can link members. 315 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 316 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 317 CHECK(java_lang_reflect_ArtField.Get() != NULL); 318 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 319 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 320 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 321 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 322 323 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 324 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 325 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 326 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 327 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 328 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 329 330 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 331 332 // Set up array classes for string, field, method 333 Handle<mirror::Class> object_array_string(hs.NewHandle( 334 AllocClass(self, java_lang_Class.Get(), 335 mirror::ObjectArray<mirror::String>::ClassSize()))); 336 object_array_string->SetComponentType(java_lang_String.Get()); 337 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 338 339 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 340 AllocClass(self, java_lang_Class.Get(), 341 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 342 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 343 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 344 345 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 346 AllocClass(self, java_lang_Class.Get(), 347 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 348 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 349 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 350 351 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 352 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 353 // these roots. 354 CHECK_NE(0U, boot_class_path.size()); 355 for (size_t i = 0; i != boot_class_path.size(); ++i) { 356 const DexFile* dex_file = boot_class_path[i]; 357 CHECK(dex_file != NULL); 358 AppendToBootClassPath(*dex_file); 359 } 360 361 // now we can use FindSystemClass 362 363 // run char class through InitializePrimitiveClass to finish init 364 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 365 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 366 367 // Create runtime resolution and imt conflict methods. Also setup the default imt. 368 Runtime* runtime = Runtime::Current(); 369 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 370 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 371 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 372 373 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 374 // we do not need friend classes or a publicly exposed setter. 375 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 376 377 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 378 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 379 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 380 CHECK_EQ(java_lang_Object.Get(), Object_class); 381 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 382 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 383 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 384 std::ostringstream os1, os2; 385 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 386 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 387 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 388 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 389 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 390 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 391 CHECK_EQ(java_lang_String.Get(), String_class); 392 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 393 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 394 395 // Setup the primitive array type classes - can't be done until Object has a vtable. 396 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 397 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 398 399 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 400 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 401 402 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 403 CHECK_EQ(char_array_class.Get(), found_char_array_class); 404 405 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 406 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 407 408 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 409 CHECK_EQ(int_array_class.Get(), found_int_array_class); 410 411 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 412 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 413 414 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 415 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 416 417 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 418 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 419 420 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 421 CHECK_EQ(class_array_class.Get(), found_class_array_class); 422 423 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 424 CHECK_EQ(object_array_class.Get(), found_object_array_class); 425 426 // Setup the single, global copy of "iftable". 427 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 428 CHECK(java_lang_Cloneable != NULL); 429 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 430 CHECK(java_io_Serializable != NULL); 431 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 432 // crawl up and explicitly list all of the supers as well. 433 { 434 mirror::IfTable* array_iftable = array_iftable_.Read(); 435 array_iftable->SetInterface(0, java_lang_Cloneable); 436 array_iftable->SetInterface(1, java_io_Serializable); 437 } 438 439 // Sanity check Class[] and Object[]'s interfaces. 440 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 441 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 442 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 443 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 444 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 445 // dex_cache_ fields and register them in class_table_. 446 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 447 CHECK_EQ(java_lang_Class.Get(), Class_class); 448 449 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 450 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 451 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 452 453 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 454 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 455 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 456 457 mirror::Class* String_array_class = 458 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 459 CHECK_EQ(object_array_string.Get(), String_array_class); 460 461 mirror::Class* Art_method_array_class = 462 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 463 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 464 465 mirror::Class* Art_field_array_class = 466 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 467 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 468 469 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 470 471 // Create java.lang.reflect.Proxy root. 472 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 473 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 474 475 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 476 // finish initializing Reference class 477 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 478 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 479 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 480 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 481 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 482 mirror::Class* java_lang_ref_FinalizerReference = 483 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 484 java_lang_ref_FinalizerReference->SetAccessFlags( 485 java_lang_ref_FinalizerReference->GetAccessFlags() | 486 kAccClassIsReference | kAccClassIsFinalizerReference); 487 mirror::Class* java_lang_ref_PhantomReference = 488 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 489 java_lang_ref_PhantomReference->SetAccessFlags( 490 java_lang_ref_PhantomReference->GetAccessFlags() | 491 kAccClassIsReference | kAccClassIsPhantomReference); 492 mirror::Class* java_lang_ref_SoftReference = 493 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 494 java_lang_ref_SoftReference->SetAccessFlags( 495 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 496 mirror::Class* java_lang_ref_WeakReference = 497 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 498 java_lang_ref_WeakReference->SetAccessFlags( 499 java_lang_ref_WeakReference->GetAccessFlags() | 500 kAccClassIsReference | kAccClassIsWeakReference); 501 502 // Setup the ClassLoader, verifying the object_size_. 503 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 504 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 505 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 506 507 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 508 // java.lang.StackTraceElement as a convenience. 509 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 510 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 511 SetClassRoot(kJavaLangClassNotFoundException, 512 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 513 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 514 SetClassRoot(kJavaLangStackTraceElementArrayClass, 515 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 516 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 517 518 FinishInit(self); 519 520 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 521} 522 523void ClassLinker::FinishInit(Thread* self) { 524 VLOG(startup) << "ClassLinker::FinishInit entering"; 525 526 // Let the heap know some key offsets into java.lang.ref instances 527 // Note: we hard code the field indexes here rather than using FindInstanceField 528 // as the types of the field can't be resolved prior to the runtime being 529 // fully initialized 530 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 531 mirror::Class* java_lang_ref_FinalizerReference = 532 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 533 534 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 535 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 536 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 537 538 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 539 CHECK_STREQ(queue->GetName(), "queue"); 540 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 541 542 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 543 CHECK_STREQ(queueNext->GetName(), "queueNext"); 544 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 545 546 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 547 CHECK_STREQ(referent->GetName(), "referent"); 548 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 549 550 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 551 CHECK_STREQ(zombie->GetName(), "zombie"); 552 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 553 554 // ensure all class_roots_ are initialized 555 for (size_t i = 0; i < kClassRootsMax; i++) { 556 ClassRoot class_root = static_cast<ClassRoot>(i); 557 mirror::Class* klass = GetClassRoot(class_root); 558 CHECK(klass != NULL); 559 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 560 // note SetClassRoot does additional validation. 561 // if possible add new checks there to catch errors early 562 } 563 564 CHECK(!array_iftable_.IsNull()); 565 566 // disable the slow paths in FindClass and CreatePrimitiveClass now 567 // that Object, Class, and Object[] are setup 568 init_done_ = true; 569 570 VLOG(startup) << "ClassLinker::FinishInit exiting"; 571} 572 573void ClassLinker::RunRootClinits() { 574 Thread* self = Thread::Current(); 575 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 576 mirror::Class* c = GetClassRoot(ClassRoot(i)); 577 if (!c->IsArrayClass() && !c->IsPrimitive()) { 578 StackHandleScope<1> hs(self); 579 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 580 EnsureInitialized(h_class, true, true); 581 self->AssertNoPendingException(); 582 } 583 } 584} 585 586bool ClassLinker::GenerateOatFile(const char* dex_filename, 587 int oat_fd, 588 const char* oat_cache_filename, 589 std::string* error_msg) { 590 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 591 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 592 593 gc::Heap* heap = Runtime::Current()->GetHeap(); 594 std::string boot_image_option("--boot-image="); 595 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 596 597 std::string dex_file_option("--dex-file="); 598 dex_file_option += dex_filename; 599 600 std::string oat_fd_option("--oat-fd="); 601 StringAppendF(&oat_fd_option, "%d", oat_fd); 602 603 std::string oat_location_option("--oat-location="); 604 oat_location_option += oat_cache_filename; 605 606 std::vector<std::string> argv; 607 argv.push_back(dex2oat); 608 argv.push_back("--runtime-arg"); 609 argv.push_back("-classpath"); 610 argv.push_back("--runtime-arg"); 611 argv.push_back(Runtime::Current()->GetClassPathString()); 612 613 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 614 615 if (!Runtime::Current()->IsVerificationEnabled()) { 616 argv.push_back("--compiler-filter=verify-none"); 617 } 618 619 if (Runtime::Current()->MustRelocateIfPossible()) { 620 argv.push_back("--runtime-arg"); 621 argv.push_back("-Xrelocate"); 622 } else { 623 argv.push_back("--runtime-arg"); 624 argv.push_back("-Xnorelocate"); 625 } 626 627 if (!kIsTargetBuild) { 628 argv.push_back("--host"); 629 } 630 631 argv.push_back(boot_image_option); 632 argv.push_back(dex_file_option); 633 argv.push_back(oat_fd_option); 634 argv.push_back(oat_location_option); 635 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 636 for (size_t i = 0; i < compiler_options.size(); ++i) { 637 argv.push_back(compiler_options[i].c_str()); 638 } 639 640 return Exec(argv, error_msg); 641} 642 643const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 644 WriterMutexLock mu(Thread::Current(), dex_lock_); 645 if (kIsDebugBuild) { 646 for (size_t i = 0; i < oat_files_.size(); ++i) { 647 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 648 } 649 } 650 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 651 oat_files_.push_back(oat_file); 652 return oat_file; 653} 654 655OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 656 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 657 OatFile* oat_file = space->ReleaseOatFile(); 658 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 659 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 660 return *oat_file; 661} 662 663const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 664 const char* dex_location = dex_file.GetLocation().c_str(); 665 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 666 return FindOpenedOatFile(nullptr, dex_location, &dex_location_checksum); 667} 668 669const OatFile* ClassLinker::FindOpenedOatFile(const char* oat_location, const char* dex_location, 670 const uint32_t* const dex_location_checksum) { 671 ReaderMutexLock mu(Thread::Current(), dex_lock_); 672 for (size_t i = 0; i < oat_files_.size(); i++) { 673 const OatFile* oat_file = oat_files_[i]; 674 DCHECK(oat_file != NULL); 675 676 if (oat_location != nullptr) { 677 if (oat_file->GetLocation() != oat_location) { 678 continue; 679 } 680 } 681 682 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 683 dex_location_checksum, 684 false); 685 if (oat_dex_file != NULL) { 686 return oat_file; 687 } 688 } 689 return NULL; 690} 691 692static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, const char* dex_location, 693 bool generated, 694 std::vector<std::string>* error_msgs, 695 std::vector<const DexFile*>* dex_files) { 696 if (oat_file == nullptr) { 697 return false; 698 } 699 700 size_t old_size = dex_files->size(); // To rollback on error. 701 702 bool success = true; 703 for (size_t i = 0; success; ++i) { 704 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 705 const char* next_name = next_name_str.c_str(); 706 707 uint32_t dex_location_checksum; 708 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 709 std::string error_msg; 710 if (!DexFile::GetChecksum(next_name, dex_location_checksum_pointer, &error_msg)) { 711 DCHECK_EQ(false, i == 0 && generated); 712 dex_location_checksum_pointer = nullptr; 713 } 714 715 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 716 717 if (oat_dex_file == nullptr) { 718 if (i == 0 && generated) { 719 std::string error_msg; 720 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 721 " file'%s'", dex_location, dex_location_checksum, 722 oat_file->GetLocation().c_str()); 723 error_msgs->push_back(error_msg); 724 } 725 break; // Not found, done. 726 } 727 728 // Checksum test. Test must succeed when generated. 729 success = !generated; 730 if (dex_location_checksum_pointer != nullptr) { 731 success = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 732 } 733 734 if (success) { 735 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 736 if (dex_file == nullptr) { 737 success = false; 738 error_msgs->push_back(error_msg); 739 } else { 740 dex_files->push_back(dex_file); 741 } 742 } 743 744 // When we generated the file, we expect success, or something is terribly wrong. 745 CHECK_EQ(false, generated && !success) 746 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 747 << std::hex << " dex_location_checksum=" << dex_location_checksum 748 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 749 } 750 751 if (dex_files->size() == old_size) { 752 success = false; // We did not even find classes.dex 753 } 754 755 if (success) { 756 return true; 757 } else { 758 // Free all the dex files we have loaded. 759 auto it = dex_files->begin() + old_size; 760 auto it_end = dex_files->end(); 761 for (; it != it_end; it++) { 762 delete *it; 763 } 764 dex_files->erase(dex_files->begin() + old_size, it_end); 765 766 return false; 767 } 768} 769 770// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 771// complicates the loading process, as we should not use an iterative loading process, because that 772// would register the oat file and dex files that come before the broken one. Instead, check all 773// multidex ahead of time. 774bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 775 std::vector<std::string>* error_msgs, 776 std::vector<const DexFile*>* dex_files) { 777 // 1) Check whether we have an open oat file. 778 // This requires a dex checksum, use the "primary" one. 779 uint32_t dex_location_checksum; 780 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 781 bool have_checksum = true; 782 std::string checksum_error_msg; 783 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 784 dex_location_checksum_pointer = nullptr; 785 have_checksum = false; 786 } 787 788 bool needs_registering = false; 789 790 std::unique_ptr<const OatFile> open_oat_file(FindOpenedOatFile(oat_location, dex_location, 791 dex_location_checksum_pointer)); 792 793 // 2) If we do not have an open one, maybe there's one on disk already. 794 795 // In case the oat file is not open, we play a locking game here so 796 // that if two different processes race to load and register or generate 797 // (or worse, one tries to open a partial generated file) we will be okay. 798 // This is actually common with apps that use DexClassLoader to work 799 // around the dex method reference limit and that have a background 800 // service running in a separate process. 801 ScopedFlock scoped_flock; 802 803 if (open_oat_file.get() == nullptr) { 804 if (oat_location != nullptr) { 805 // Can only do this if we have a checksum, else error. 806 if (!have_checksum) { 807 error_msgs->push_back(checksum_error_msg); 808 return false; 809 } 810 811 std::string error_msg; 812 813 // We are loading or creating one in the future. Time to set up the file lock. 814 if (!scoped_flock.Init(oat_location, &error_msg)) { 815 error_msgs->push_back(error_msg); 816 return false; 817 } 818 819 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 820 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 821 oat_location, &error_msg)); 822 823 if (open_oat_file.get() == nullptr) { 824 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 825 dex_location, oat_location, error_msg.c_str()); 826 VLOG(class_linker) << compound_msg; 827 error_msgs->push_back(compound_msg); 828 } 829 } else { 830 // TODO: What to lock here? 831 bool obsolete_file_cleanup_failed; 832 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 833 dex_location_checksum_pointer, 834 kRuntimeISA, error_msgs, 835 &obsolete_file_cleanup_failed)); 836 // There's no point in going forward and eventually try to regenerate the 837 // file if we couldn't remove the obsolete one. Mostly likely we will fail 838 // with the same error when trying to write the new file. 839 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 840 if (obsolete_file_cleanup_failed) { 841 return false; 842 } 843 } 844 needs_registering = true; 845 } 846 847 // 3) If we have an oat file, check all contained multidex files for our dex_location. 848 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 849 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, false, error_msgs, 850 dex_files); 851 if (success) { 852 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 853 if (needs_registering) { 854 // We opened the oat file, so we must register it. 855 RegisterOatFile(oat_file); 856 } 857 // If the file isn't executable we failed patchoat but did manage to get the dex files. 858 return oat_file->IsExecutable(); 859 } else { 860 if (needs_registering) { 861 // We opened it, delete it. 862 open_oat_file.reset(); 863 } else { 864 open_oat_file.release(); // Do not delete open oat files. 865 } 866 } 867 868 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 869 870 // Need a checksum, fail else. 871 if (!have_checksum) { 872 error_msgs->push_back(checksum_error_msg); 873 return false; 874 } 875 876 // Look in cache location if no oat_location is given. 877 std::string cache_location; 878 if (oat_location == nullptr) { 879 // Use the dalvik cache. 880 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 881 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 882 oat_location = cache_location.c_str(); 883 } 884 885 // Definitely need to lock now. 886 if (!scoped_flock.HasFile()) { 887 std::string error_msg; 888 if (!scoped_flock.Init(oat_location, &error_msg)) { 889 error_msgs->push_back(error_msg); 890 return false; 891 } 892 } 893 894 if (Runtime::Current()->IsDex2OatEnabled()) { 895 // Create the oat file. 896 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 897 oat_location, error_msgs)); 898 } 899 900 // Failed, bail. 901 if (open_oat_file.get() == nullptr) { 902 std::string error_msg; 903 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 904 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 905 error_msgs->push_back(error_msg); 906 return false; 907 } 908 909 // Try to load again, but stronger checks. 910 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, true, error_msgs, 911 dex_files); 912 if (success) { 913 RegisterOatFile(open_oat_file.release()); 914 return true; 915 } else { 916 return false; 917 } 918} 919 920const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 921 uint32_t dex_location_checksum, 922 const char* oat_location, 923 std::string* error_msg) { 924 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 925 !Runtime::Current()->IsCompiler(), 926 error_msg)); 927 if (oat_file.get() == nullptr) { 928 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 929 error_msg->c_str()); 930 return nullptr; 931 } 932 Runtime* runtime = Runtime::Current(); 933 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 934 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 935 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 936 if (expected_image_oat_checksum != actual_image_oat_checksum) { 937 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 938 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 939 actual_image_oat_checksum); 940 return nullptr; 941 } 942 943 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 944 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 945 if (expected_image_oat_offset != actual_image_oat_offset) { 946 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 947 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 948 actual_image_oat_offset); 949 return nullptr; 950 } 951 int32_t expected_patch_delta = image_header.GetPatchDelta(); 952 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 953 if (expected_patch_delta != actual_patch_delta) { 954 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 955 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 956 return nullptr; 957 } 958 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 959 &dex_location_checksum); 960 if (oat_dex_file == nullptr) { 961 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 962 dex_location); 963 return nullptr; 964 } 965 uint32_t expected_dex_checksum = dex_location_checksum; 966 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 967 if (expected_dex_checksum != actual_dex_checksum) { 968 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 969 "found 0x%x", oat_location, expected_dex_checksum, 970 actual_dex_checksum); 971 return nullptr; 972 } 973 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 974 if (dex_file.get() != nullptr) { 975 return oat_file.release(); 976 } else { 977 return nullptr; 978 } 979} 980 981const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 982 int fd, const char* oat_location, 983 std::vector<std::string>* error_msgs) { 984 // Generate the output oat file for the dex file 985 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 986 std::string error_msg; 987 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 988 CHECK(!error_msg.empty()); 989 error_msgs->push_back(error_msg); 990 return nullptr; 991 } 992 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 993 !Runtime::Current()->IsCompiler(), 994 &error_msg)); 995 if (oat_file.get() == nullptr) { 996 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 997 oat_location, error_msg.c_str()); 998 error_msgs->push_back(compound_msg); 999 return nullptr; 1000 } 1001 1002 return oat_file.release(); 1003} 1004 1005bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1006 const InstructionSet instruction_set) { 1007 Runtime* runtime = Runtime::Current(); 1008 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1009 uint32_t image_oat_checksum = 0; 1010 if (instruction_set == kRuntimeISA) { 1011 const ImageHeader& image_header = image_space->GetImageHeader(); 1012 image_oat_checksum = image_header.GetOatChecksum(); 1013 } else { 1014 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1015 image_space->GetImageLocation().c_str(), instruction_set)); 1016 image_oat_checksum = image_header->GetOatChecksum(); 1017 } 1018 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1019} 1020 1021bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1022 const InstructionSet instruction_set, 1023 std::string* error_msg) { 1024 Runtime* runtime = Runtime::Current(); 1025 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1026 1027 // If the requested instruction set is the same as the current runtime, 1028 // we can use the checksums directly. If it isn't, we'll have to read the 1029 // image header from the image for the right instruction set. 1030 uint32_t image_oat_checksum = 0; 1031 uintptr_t image_oat_data_begin = 0; 1032 int32_t image_patch_delta = 0; 1033 if (instruction_set == Runtime::Current()->GetInstructionSet()) { 1034 const ImageHeader& image_header = image_space->GetImageHeader(); 1035 image_oat_checksum = image_header.GetOatChecksum(); 1036 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1037 image_patch_delta = image_header.GetPatchDelta(); 1038 } else { 1039 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1040 image_space->GetImageLocation().c_str(), instruction_set)); 1041 image_oat_checksum = image_header->GetOatChecksum(); 1042 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1043 image_patch_delta = image_header->GetPatchDelta(); 1044 } 1045 const OatHeader& oat_header = oat_file->GetOatHeader(); 1046 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1047 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1048 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1049 if (!ret) { 1050 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1051 oat_file->GetLocation().c_str(), 1052 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1053 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1054 oat_file->GetOatHeader().GetImagePatchDelta(), 1055 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1056 } 1057 return ret; 1058} 1059 1060bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1061 const char* dex_location, 1062 uint32_t dex_location_checksum, 1063 const InstructionSet instruction_set, 1064 std::string* error_msg) { 1065 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1066 return false; 1067 } 1068 1069 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1070 &dex_location_checksum); 1071 if (oat_dex_file == NULL) { 1072 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1073 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1074 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 1075 for (size_t i = 0; i < oat_dex_files.size(); i++) { 1076 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 1077 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 1078 oat_file->GetLocation().c_str(), 1079 oat_dex_file->GetDexFileLocation().c_str()); 1080 } 1081 return false; 1082 } 1083 1084 if (dex_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) { 1085 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1086 oat_file->GetLocation().c_str(), 1087 oat_dex_file->GetDexFileLocationChecksum(), 1088 dex_location, dex_location_checksum); 1089 return false; 1090 } 1091 return true; 1092} 1093 1094bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1095 const char* dex_location, 1096 std::string* error_msg) { 1097 CHECK(oat_file != nullptr); 1098 CHECK(dex_location != nullptr); 1099 std::unique_ptr<const DexFile> dex_file; 1100 uint32_t dex_location_checksum; 1101 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 1102 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1103 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1104 // directory. 1105 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1106 if (oat_dex_file == nullptr) { 1107 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1108 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1109 error_msg->c_str()); 1110 return false; 1111 } 1112 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1113 } else { 1114 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, dex_location_checksum, 1115 kRuntimeISA, error_msg); 1116 if (!verified) { 1117 return false; 1118 } 1119 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1120 &dex_location_checksum)->OpenDexFile(error_msg)); 1121 } 1122 return dex_file.get() != nullptr; 1123} 1124 1125const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1126 const char* dex_location, 1127 const uint32_t* const dex_location_checksum, 1128 InstructionSet isa, 1129 std::vector<std::string>* error_msgs, 1130 bool* obsolete_file_cleanup_failed) { 1131 *obsolete_file_cleanup_failed = false; 1132 bool already_opened = false; 1133 std::string dex_location_str(dex_location); 1134 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1135 &already_opened, 1136 obsolete_file_cleanup_failed, 1137 error_msgs)); 1138 std::string error_msg; 1139 if (oat_file.get() == nullptr) { 1140 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1141 dex_location)); 1142 return nullptr; 1143 } else if (oat_file->IsExecutable() && 1144 !VerifyOatWithDexFile(oat_file.get(), dex_location, &error_msg)) { 1145 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1146 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1147 error_msg.c_str())); 1148 return nullptr; 1149 } else if (!oat_file->IsExecutable() && 1150 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1151 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1152 "dex location '%s'. Image checksum incorrect.", 1153 oat_file->GetLocation().c_str(), dex_location)); 1154 return nullptr; 1155 } else { 1156 return oat_file.release(); 1157 } 1158} 1159 1160const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1161 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1162 for (size_t i = 0; i < oat_files_.size(); i++) { 1163 const OatFile* oat_file = oat_files_[i]; 1164 DCHECK(oat_file != nullptr); 1165 if (oat_file->GetLocation() == oat_location) { 1166 return oat_file; 1167 } 1168 } 1169 return nullptr; 1170} 1171 1172const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1173 InstructionSet isa, 1174 bool *already_opened, 1175 bool *obsolete_file_cleanup_failed, 1176 std::vector<std::string>* error_msgs) { 1177 // Find out if we've already opened the file 1178 const OatFile* ret = nullptr; 1179 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1180 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1181 if (ret != nullptr) { 1182 *already_opened = true; 1183 return ret; 1184 } 1185 1186 std::string dalvik_cache; 1187 bool have_android_data = false; 1188 bool have_dalvik_cache = false; 1189 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1190 &have_android_data, &have_dalvik_cache); 1191 std::string cache_filename; 1192 if (have_dalvik_cache) { 1193 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1194 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1195 if (ret != nullptr) { 1196 *already_opened = true; 1197 return ret; 1198 } 1199 } else { 1200 // If we need to relocate we should just place odex back where it started. 1201 cache_filename = odex_filename; 1202 } 1203 1204 ret = nullptr; 1205 1206 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1207 // 1208 // Now we do the following: 1209 // 1) Try and open the odex version 1210 // 2) If present, checksum-verified & relocated correctly return it 1211 // 3) Close the odex version to free up its address space. 1212 // 4) Try and open the cache version 1213 // 5) If present, checksum-verified & relocated correctly return it 1214 // 6) Close the cache version to free up its address space. 1215 // 7) If we should relocate: 1216 // a) If we have opened and checksum-verified the odex version relocate it to 1217 // 'cache_filename' and return it 1218 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1219 // it. This should not happen often (I think only the run-test's will hit this case). 1220 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1221 // this point. 1222 // 9) Return nullptr 1223 1224 *already_opened = false; 1225 const Runtime* runtime = Runtime::Current(); 1226 CHECK(runtime != nullptr); 1227 bool executable = !runtime->IsCompiler(); 1228 1229 std::string odex_error_msg; 1230 bool should_patch_system = false; 1231 bool odex_checksum_verified = false; 1232 { 1233 // There is a high probability that these both these oat files map similar/the same address 1234 // spaces so we must scope them like this so they each gets its turn. 1235 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, NULL, 1236 executable, &odex_error_msg)); 1237 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1238 &odex_checksum_verified, 1239 &odex_error_msg)) { 1240 error_msgs->push_back(odex_error_msg); 1241 return odex_oat_file.release(); 1242 } else if (odex_checksum_verified) { 1243 // We can just relocate 1244 should_patch_system = true; 1245 odex_error_msg = "Image Patches are incorrect"; 1246 } 1247 } 1248 1249 1250 std::string cache_error_msg; 1251 bool should_patch_cache = false; 1252 bool cache_checksum_verified = false; 1253 if (have_dalvik_cache) { 1254 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, NULL, 1255 executable, &cache_error_msg)); 1256 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1257 &cache_checksum_verified, 1258 &cache_error_msg)) { 1259 error_msgs->push_back(cache_error_msg); 1260 return cache_oat_file.release(); 1261 } else if (cache_checksum_verified) { 1262 // We can just relocate 1263 should_patch_cache = true; 1264 cache_error_msg = "Image Patches are incorrect"; 1265 } 1266 } else if (have_android_data) { 1267 // dalvik_cache does not exist but android data does. This means we should be able to create 1268 // it, so we should try. 1269 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1270 } 1271 1272 ret = nullptr; 1273 std::string error_msg; 1274 if (runtime->CanRelocate()) { 1275 // Run relocation 1276 const std::string& image_location = 1277 Runtime::Current()->GetHeap()->GetImageSpace()->GetImageLocation(); 1278 if (odex_checksum_verified && should_patch_system) { 1279 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1280 } else if (cache_checksum_verified && should_patch_cache) { 1281 CHECK(have_dalvik_cache); 1282 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1283 } 1284 } 1285 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1286 // implicitly: were able to fine where the cached version is but we were unable to use it, 1287 // either as a destination for relocation or to open a file. We should delete it if it is 1288 // there. 1289 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1290 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1291 "searching for dex file %s: %s", 1292 cache_filename.c_str(), dex_location.c_str(), 1293 strerror(errno)); 1294 error_msgs->push_back(rm_error_msg); 1295 VLOG(class_linker) << rm_error_msg; 1296 // Let the caller know that we couldn't remove the obsolete file. 1297 // This is a good indication that further writes may fail as well. 1298 *obsolete_file_cleanup_failed = true; 1299 } 1300 } 1301 if (ret == nullptr) { 1302 VLOG(class_linker) << error_msg; 1303 error_msgs->push_back(error_msg); 1304 std::string relocation_msg; 1305 if (runtime->CanRelocate()) { 1306 relocation_msg = StringPrintf(" and relocation failed"); 1307 } 1308 if (have_dalvik_cache && cache_checksum_verified) { 1309 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1310 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1311 cache_filename.c_str(), cache_error_msg.c_str(), 1312 relocation_msg.c_str()); 1313 } else { 1314 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1315 "dalvik_cache availible)%s.", odex_filename.c_str(), 1316 odex_error_msg.c_str(), relocation_msg.c_str()); 1317 } 1318 VLOG(class_linker) << error_msg; 1319 error_msgs->push_back(error_msg); 1320 } 1321 return ret; 1322} 1323 1324const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1325 InstructionSet isa, 1326 std::string* error_msg) { 1327 // We open it non-executable 1328 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, NULL, false, error_msg)); 1329 if (output.get() == nullptr) { 1330 return nullptr; 1331 } 1332 if (VerifyOatImageChecksum(output.get(), isa)) { 1333 return output.release(); 1334 } else { 1335 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1336 oat_path.c_str()); 1337 return nullptr; 1338 } 1339} 1340 1341const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1342 const std::string& output_oat, 1343 const std::string& image_location, 1344 InstructionSet isa, 1345 std::string* error_msg) { 1346 if (!Runtime::Current()->IsDex2OatEnabled()) { 1347 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1348 // input_oat but make sure we only do interpretation on it's dex files. 1349 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1350 << "disabled. Attempting to use oat file for interpretation"; 1351 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1352 } 1353 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1354 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1355 1356 std::string isa_arg("--instruction-set="); 1357 isa_arg += GetInstructionSetString(isa); 1358 std::string input_oat_filename_arg("--input-oat-file="); 1359 input_oat_filename_arg += input_oat; 1360 std::string output_oat_filename_arg("--output-oat-file="); 1361 output_oat_filename_arg += output_oat; 1362 std::string patched_image_arg("--patched-image-location="); 1363 patched_image_arg += image_location; 1364 1365 std::vector<std::string> argv; 1366 argv.push_back(patchoat); 1367 argv.push_back(isa_arg); 1368 argv.push_back(input_oat_filename_arg); 1369 argv.push_back(output_oat_filename_arg); 1370 argv.push_back(patched_image_arg); 1371 1372 std::string command_line(Join(argv, ' ')); 1373 LOG(INFO) << "Relocate Oat File: " << command_line; 1374 bool success = Exec(argv, error_msg); 1375 if (success) { 1376 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, NULL, 1377 !Runtime::Current()->IsCompiler(), error_msg)); 1378 bool checksum_verified = false; 1379 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1380 return output.release(); 1381 } else if (output.get() != nullptr) { 1382 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1383 "but output file '%s' failed verifcation: %s", 1384 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1385 } else { 1386 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1387 "but was unable to open output file '%s': %s", 1388 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1389 } 1390 } else if (!Runtime::Current()->IsCompiler()) { 1391 // patchoat failed which means we probably don't have enough room to place the output oat file, 1392 // instead of failing we should just run the interpreter from the dex files in the input oat. 1393 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1394 << "for interpretation. patchoat failure was: " << *error_msg; 1395 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1396 } else { 1397 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1398 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1399 error_msg->c_str()); 1400 } 1401 return nullptr; 1402} 1403 1404int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1405 Runtime* runtime = Runtime::Current(); 1406 int32_t real_patch_delta; 1407 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1408 if (isa == Runtime::Current()->GetInstructionSet()) { 1409 const ImageHeader& image_header = image_space->GetImageHeader(); 1410 real_patch_delta = image_header.GetPatchDelta(); 1411 } else { 1412 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1413 image_space->GetImageLocation().c_str(), isa)); 1414 real_patch_delta = image_header->GetPatchDelta(); 1415 } 1416 const OatHeader& oat_header = oat_file->GetOatHeader(); 1417 return real_patch_delta - oat_header.GetImagePatchDelta(); 1418} 1419 1420bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1421 bool* checksum_verified, 1422 std::string* error_msg) { 1423 std::string compound_msg("Oat file failed to verify: "); 1424 Runtime* runtime = Runtime::Current(); 1425 uint32_t real_image_checksum; 1426 void* real_image_oat_offset; 1427 int32_t real_patch_delta; 1428 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1429 if (isa == Runtime::Current()->GetInstructionSet()) { 1430 const ImageHeader& image_header = image_space->GetImageHeader(); 1431 real_image_checksum = image_header.GetOatChecksum(); 1432 real_image_oat_offset = image_header.GetOatDataBegin(); 1433 real_patch_delta = image_header.GetPatchDelta(); 1434 } else { 1435 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1436 image_space->GetImageLocation().c_str(), isa)); 1437 real_image_checksum = image_header->GetOatChecksum(); 1438 real_image_oat_offset = image_header->GetOatDataBegin(); 1439 real_patch_delta = image_header->GetPatchDelta(); 1440 } 1441 1442 const OatHeader& oat_header = oat_file->GetOatHeader(); 1443 1444 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1445 *checksum_verified = oat_image_checksum == real_image_checksum; 1446 if (!*checksum_verified) { 1447 compound_msg += StringPrintf(" Oat Image Checksum Incorrect (expected 0x%x, recieved 0x%x)", 1448 real_image_checksum, oat_image_checksum); 1449 } 1450 1451 void* oat_image_oat_offset = 1452 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1453 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1454 if (!offset_verified) { 1455 compound_msg += StringPrintf(" Oat Image oat offset incorrect (expected 0x%p, recieved 0x%p)", 1456 real_image_oat_offset, oat_image_oat_offset); 1457 } 1458 1459 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1460 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1461 if (!patch_delta_verified) { 1462 compound_msg += StringPrintf(" Oat image patch delta incorrect (expected 0x%x, recieved 0x%x)", 1463 real_patch_delta, oat_patch_delta); 1464 } 1465 1466 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1467 if (ret) { 1468 *error_msg = compound_msg; 1469 } 1470 return ret; 1471} 1472 1473const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1474 std::string* error_msg) { 1475 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1476 if (oat_file != nullptr) { 1477 return oat_file; 1478 } 1479 1480 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1481 error_msg); 1482 if (oat_file == NULL) { 1483 return NULL; 1484 } 1485 return oat_file; 1486} 1487 1488static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1489 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1490 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1491 1492 DCHECK(obj != NULL); 1493 DCHECK(class_linker != NULL); 1494 1495 if (obj->IsArtMethod()) { 1496 mirror::ArtMethod* method = obj->AsArtMethod(); 1497 if (!method->IsNative()) { 1498 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1499 if (method != Runtime::Current()->GetResolutionMethod()) { 1500 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1501 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1502 } 1503 } 1504 } 1505} 1506 1507void ClassLinker::InitFromImage() { 1508 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1509 CHECK(!init_done_); 1510 1511 Thread* self = Thread::Current(); 1512 gc::Heap* heap = Runtime::Current()->GetHeap(); 1513 gc::space::ImageSpace* space = heap->GetImageSpace(); 1514 dex_cache_image_class_lookup_required_ = true; 1515 CHECK(space != NULL); 1516 OatFile& oat_file = GetImageOatFile(space); 1517 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1518 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1519 const char* image_file_location = oat_file.GetOatHeader(). 1520 GetStoreValueByKey(OatHeader::kImageLocationKey); 1521 CHECK(image_file_location == nullptr || *image_file_location == 0); 1522 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1523 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1524 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1525 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1526 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1527 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1528 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1529 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1530 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1531 1532 StackHandleScope<1> hs(self); 1533 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1534 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1535 AsObjectArray<mirror::Class>())); 1536 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1537 1538 // Special case of setting up the String class early so that we can test arbitrary objects 1539 // as being Strings or not 1540 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1541 1542 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1543 static_cast<uint32_t>(dex_caches->GetLength())); 1544 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1545 StackHandleScope<1> hs(self); 1546 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1547 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1548 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1549 nullptr); 1550 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1551 std::string error_msg; 1552 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1553 if (dex_file == NULL) { 1554 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1555 << " from within oat file " << oat_file.GetLocation() 1556 << " error '" << error_msg << "'"; 1557 } 1558 1559 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1560 1561 AppendToBootClassPath(*dex_file, dex_cache); 1562 } 1563 1564 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1565 // bitmap walk. 1566 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1567 1568 // Set entry point to interpreter if in InterpretOnly mode. 1569 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1570 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1571 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1572 } 1573 1574 // reinit class_roots_ 1575 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1576 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1577 1578 // reinit array_iftable_ from any array class instance, they should be == 1579 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1580 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1581 // String class root was set above 1582 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1583 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1584 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1585 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1586 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1587 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1588 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1589 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1590 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1591 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1592 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1593 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1594 1595 FinishInit(self); 1596 1597 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1598} 1599 1600void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1601 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1602 if ((flags & kVisitRootFlagAllRoots) != 0) { 1603 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1604 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1605 } 1606 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1607 for (auto& pair : new_class_roots_) { 1608 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1609 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1610 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1611 if (UNLIKELY(new_ref != old_ref)) { 1612 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1613 // corresponding object. This is slow, but luckily for us, this may only happen with a 1614 // concurrent moving GC. 1615 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1616 it != end && it->first == pair.first; ++it) { 1617 // If the class stored matches the old class, update it to the new value. 1618 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1619 it->second = GcRoot<mirror::Class>(new_ref); 1620 } 1621 } 1622 } 1623 } 1624 } 1625 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1626 new_class_roots_.clear(); 1627 } 1628 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1629 log_new_class_table_roots_ = true; 1630 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1631 log_new_class_table_roots_ = false; 1632 } 1633 // We deliberately ignore the class roots in the image since we 1634 // handle image roots by using the MS/CMS rescanning of dirty cards. 1635} 1636 1637// Keep in sync with InitCallback. Anything we visit, we need to 1638// reinit references to when reinitializing a ClassLinker from a 1639// mapped image. 1640void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1641 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1642 Thread* self = Thread::Current(); 1643 { 1644 ReaderMutexLock mu(self, dex_lock_); 1645 if ((flags & kVisitRootFlagAllRoots) != 0) { 1646 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1647 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1648 } 1649 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1650 for (size_t index : new_dex_cache_roots_) { 1651 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1652 } 1653 } 1654 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1655 new_dex_cache_roots_.clear(); 1656 } 1657 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1658 log_new_dex_caches_roots_ = true; 1659 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1660 log_new_dex_caches_roots_ = false; 1661 } 1662 } 1663 VisitClassRoots(callback, arg, flags); 1664 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1665 DCHECK(!array_iftable_.IsNull()); 1666 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1667 if (!find_array_class_cache_[i].IsNull()) { 1668 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1669 } 1670 } 1671} 1672 1673void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1674 if (dex_cache_image_class_lookup_required_) { 1675 MoveImageClassesToClassTable(); 1676 } 1677 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1678 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1679 mirror::Class* c = it.second.Read(); 1680 if (!visitor(c, arg)) { 1681 return; 1682 } 1683 } 1684} 1685 1686static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1687 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1688 classes->insert(c); 1689 return true; 1690} 1691 1692void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1693 std::set<mirror::Class*> classes; 1694 VisitClasses(GetClassesVisitor, &classes); 1695 for (mirror::Class* klass : classes) { 1696 if (!visitor(klass, arg)) { 1697 return; 1698 } 1699 } 1700} 1701 1702ClassLinker::~ClassLinker() { 1703 mirror::Class::ResetClass(); 1704 mirror::String::ResetClass(); 1705 mirror::Reference::ResetClass(); 1706 mirror::ArtField::ResetClass(); 1707 mirror::ArtMethod::ResetClass(); 1708 mirror::BooleanArray::ResetArrayClass(); 1709 mirror::ByteArray::ResetArrayClass(); 1710 mirror::CharArray::ResetArrayClass(); 1711 mirror::DoubleArray::ResetArrayClass(); 1712 mirror::FloatArray::ResetArrayClass(); 1713 mirror::IntArray::ResetArrayClass(); 1714 mirror::LongArray::ResetArrayClass(); 1715 mirror::ShortArray::ResetArrayClass(); 1716 mirror::Throwable::ResetClass(); 1717 mirror::StackTraceElement::ResetClass(); 1718 STLDeleteElements(&boot_class_path_); 1719 STLDeleteElements(&oat_files_); 1720} 1721 1722mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1723 gc::Heap* heap = Runtime::Current()->GetHeap(); 1724 StackHandleScope<16> hs(self); 1725 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1726 Handle<mirror::DexCache> dex_cache( 1727 hs.NewHandle(down_cast<mirror::DexCache*>( 1728 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1729 VoidFunctor())))); 1730 if (dex_cache.Get() == NULL) { 1731 return NULL; 1732 } 1733 Handle<mirror::String> 1734 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1735 if (location.Get() == NULL) { 1736 return NULL; 1737 } 1738 Handle<mirror::ObjectArray<mirror::String>> 1739 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1740 if (strings.Get() == NULL) { 1741 return NULL; 1742 } 1743 Handle<mirror::ObjectArray<mirror::Class>> 1744 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1745 if (types.Get() == NULL) { 1746 return NULL; 1747 } 1748 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1749 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1750 if (methods.Get() == NULL) { 1751 return NULL; 1752 } 1753 Handle<mirror::ObjectArray<mirror::ArtField>> 1754 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1755 if (fields.Get() == NULL) { 1756 return NULL; 1757 } 1758 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1759 fields.Get()); 1760 return dex_cache.Get(); 1761} 1762 1763mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1764 uint32_t class_size) { 1765 DCHECK_GE(class_size, sizeof(mirror::Class)); 1766 gc::Heap* heap = Runtime::Current()->GetHeap(); 1767 mirror::Class::InitializeClassVisitor visitor(class_size); 1768 mirror::Object* k = kMovingClasses ? 1769 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1770 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1771 if (UNLIKELY(k == nullptr)) { 1772 CHECK(self->IsExceptionPending()); // OOME. 1773 return nullptr; 1774 } 1775 return k->AsClass(); 1776} 1777 1778mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1779 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1780} 1781 1782mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1783 return down_cast<mirror::ArtField*>( 1784 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1785} 1786 1787mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1788 return down_cast<mirror::ArtMethod*>( 1789 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1790} 1791 1792mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1793 Thread* self, size_t length) { 1794 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1795 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1796} 1797 1798mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1799 mirror::Class* klass) { 1800 DCHECK(klass != NULL); 1801 1802 // For temporary classes we must wait for them to be retired. 1803 if (init_done_ && klass->IsTemp()) { 1804 CHECK(!klass->IsResolved()); 1805 if (klass->IsErroneous()) { 1806 ThrowEarlierClassFailure(klass); 1807 return nullptr; 1808 } 1809 StackHandleScope<1> hs(self); 1810 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1811 ObjectLock<mirror::Class> lock(self, h_class); 1812 // Loop and wait for the resolving thread to retire this class. 1813 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1814 lock.WaitIgnoringInterrupts(); 1815 } 1816 if (h_class->IsErroneous()) { 1817 ThrowEarlierClassFailure(h_class.Get()); 1818 return nullptr; 1819 } 1820 CHECK(h_class->IsRetired()); 1821 // Get the updated class from class table. 1822 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1823 } 1824 1825 // Wait for the class if it has not already been linked. 1826 if (!klass->IsResolved() && !klass->IsErroneous()) { 1827 StackHandleScope<1> hs(self); 1828 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1829 ObjectLock<mirror::Class> lock(self, h_class); 1830 // Check for circular dependencies between classes. 1831 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1832 ThrowClassCircularityError(h_class.Get()); 1833 h_class->SetStatus(mirror::Class::kStatusError, self); 1834 return nullptr; 1835 } 1836 // Wait for the pending initialization to complete. 1837 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1838 lock.WaitIgnoringInterrupts(); 1839 } 1840 } 1841 1842 if (klass->IsErroneous()) { 1843 ThrowEarlierClassFailure(klass); 1844 return nullptr; 1845 } 1846 // Return the loaded class. No exceptions should be pending. 1847 CHECK(klass->IsResolved()) << PrettyClass(klass); 1848 self->AssertNoPendingException(); 1849 return klass; 1850} 1851 1852mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1853 Handle<mirror::ClassLoader> class_loader) { 1854 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1855 DCHECK(self != nullptr); 1856 self->AssertNoPendingException(); 1857 if (descriptor[1] == '\0') { 1858 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1859 // for primitive classes that aren't backed by dex files. 1860 return FindPrimitiveClass(descriptor[0]); 1861 } 1862 // Find the class in the loaded classes table. 1863 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1864 if (klass != NULL) { 1865 return EnsureResolved(self, descriptor, klass); 1866 } 1867 // Class is not yet loaded. 1868 if (descriptor[0] == '[') { 1869 return CreateArrayClass(self, descriptor, class_loader); 1870 } else if (class_loader.Get() == nullptr) { 1871 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1872 if (pair.second != NULL) { 1873 StackHandleScope<1> hs(self); 1874 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1875 } 1876 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1877 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1878 // throw of a NoClassDefFoundError. 1879 if (IsInBootClassPath(descriptor)) { 1880 mirror::Class* system_class = FindSystemClass(self, descriptor); 1881 CHECK(system_class != NULL); 1882 return system_class; 1883 } 1884 // Next try the compile time class path. 1885 const std::vector<const DexFile*>* class_path; 1886 { 1887 ScopedObjectAccessUnchecked soa(self); 1888 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1889 soa.AddLocalReference<jobject>(class_loader.Get())); 1890 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1891 } 1892 1893 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1894 if (pair.second != NULL) { 1895 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1896 } 1897 1898 } else { 1899 ScopedObjectAccessUnchecked soa(self); 1900 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1901 soa.AddLocalReference<jobject>(class_loader.Get())); 1902 std::string class_name_string(DescriptorToDot(descriptor)); 1903 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1904 { 1905 ScopedThreadStateChange tsc(self, kNative); 1906 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1907 soa.Env()->NewStringUTF(class_name_string.c_str())); 1908 if (class_name_object.get() == NULL) { 1909 return NULL; 1910 } 1911 CHECK(class_loader_object.get() != NULL); 1912 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1913 WellKnownClasses::java_lang_ClassLoader_loadClass, 1914 class_name_object.get())); 1915 } 1916 if (self->IsExceptionPending()) { 1917 // If the ClassLoader threw, pass that exception up. 1918 return NULL; 1919 } else if (result.get() == NULL) { 1920 // broken loader - throw NPE to be compatible with Dalvik 1921 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1922 class_name_string.c_str()).c_str()); 1923 return NULL; 1924 } else { 1925 // success, return mirror::Class* 1926 return soa.Decode<mirror::Class*>(result.get()); 1927 } 1928 } 1929 1930 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1931 return NULL; 1932} 1933 1934mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1935 Handle<mirror::ClassLoader> class_loader, 1936 const DexFile& dex_file, 1937 const DexFile::ClassDef& dex_class_def) { 1938 Thread* self = Thread::Current(); 1939 StackHandleScope<3> hs(self); 1940 auto klass = hs.NewHandle<mirror::Class>(nullptr); 1941 bool should_allocate = false; 1942 1943 // Load the class from the dex file. 1944 if (UNLIKELY(!init_done_)) { 1945 // finish up init of hand crafted class_roots_ 1946 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1947 klass.Assign(GetClassRoot(kJavaLangObject)); 1948 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1949 klass.Assign(GetClassRoot(kJavaLangClass)); 1950 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1951 klass.Assign(GetClassRoot(kJavaLangString)); 1952 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 1953 klass.Assign(GetClassRoot(kJavaLangRefReference)); 1954 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1955 klass.Assign(GetClassRoot(kJavaLangDexCache)); 1956 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1957 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 1958 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1959 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 1960 } else { 1961 should_allocate = true; 1962 } 1963 } else { 1964 should_allocate = true; 1965 } 1966 1967 if (should_allocate) { 1968 // Allocate a class with the status of not ready. 1969 // Interface object should get the right size here. Regular class will 1970 // figure out the right size later and be replaced with one of the right 1971 // size when the class becomes resolved. 1972 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 1973 } 1974 if (UNLIKELY(klass.Get() == nullptr)) { 1975 CHECK(self->IsExceptionPending()); // Expect an OOME. 1976 return nullptr; 1977 } 1978 klass->SetDexCache(FindDexCache(dex_file)); 1979 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 1980 ObjectLock<mirror::Class> lock(self, klass); 1981 if (self->IsExceptionPending()) { 1982 // An exception occured during load, set status to erroneous while holding klass' lock in case 1983 // notification is necessary. 1984 if (!klass->IsErroneous()) { 1985 klass->SetStatus(mirror::Class::kStatusError, self); 1986 } 1987 return nullptr; 1988 } 1989 klass->SetClinitThreadId(self->GetTid()); 1990 1991 // Add the newly loaded class to the loaded classes table. 1992 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 1993 if (existing != nullptr) { 1994 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1995 // this thread to block. 1996 return EnsureResolved(self, descriptor, existing); 1997 } 1998 1999 // Finish loading (if necessary) by finding parents 2000 CHECK(!klass->IsLoaded()); 2001 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2002 // Loading failed. 2003 if (!klass->IsErroneous()) { 2004 klass->SetStatus(mirror::Class::kStatusError, self); 2005 } 2006 return nullptr; 2007 } 2008 CHECK(klass->IsLoaded()); 2009 // Link the class (if necessary) 2010 CHECK(!klass->IsResolved()); 2011 // TODO: Use fast jobjects? 2012 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2013 2014 mirror::Class* new_class = nullptr; 2015 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2016 // Linking failed. 2017 if (!klass->IsErroneous()) { 2018 klass->SetStatus(mirror::Class::kStatusError, self); 2019 } 2020 return nullptr; 2021 } 2022 CHECK(new_class != nullptr) << descriptor; 2023 CHECK(new_class->IsResolved()) << descriptor; 2024 2025 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2026 2027 /* 2028 * We send CLASS_PREPARE events to the debugger from here. The 2029 * definition of "preparation" is creating the static fields for a 2030 * class and initializing them to the standard default values, but not 2031 * executing any code (that comes later, during "initialization"). 2032 * 2033 * We did the static preparation in LinkClass. 2034 * 2035 * The class has been prepared and resolved but possibly not yet verified 2036 * at this point. 2037 */ 2038 Dbg::PostClassPrepare(new_class_h.Get()); 2039 2040 return new_class_h.Get(); 2041} 2042 2043uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2044 const DexFile::ClassDef& dex_class_def) { 2045 const byte* class_data = dex_file.GetClassData(dex_class_def); 2046 size_t num_ref = 0; 2047 size_t num_32 = 0; 2048 size_t num_64 = 0; 2049 if (class_data != NULL) { 2050 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2051 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2052 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2053 char c = descriptor[0]; 2054 if (c == 'L' || c == '[') { 2055 num_ref++; 2056 } else if (c == 'J' || c == 'D') { 2057 num_64++; 2058 } else { 2059 num_32++; 2060 } 2061 } 2062 } 2063 return mirror::Class::ComputeClassSize(false, 0, num_32, num_64, num_ref); 2064} 2065 2066bool ClassLinker::FindOatClass(const DexFile& dex_file, 2067 uint16_t class_def_idx, 2068 OatFile::OatClass* oat_class) { 2069 DCHECK(oat_class != nullptr); 2070 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2071 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2072 if (oat_file == nullptr) { 2073 return false; 2074 } 2075 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2076 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2077 &dex_location_checksum); 2078 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 2079 *oat_class = oat_dex_file->GetOatClass(class_def_idx); 2080 return true; 2081} 2082 2083static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2084 uint32_t method_idx) { 2085 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2086 const byte* class_data = dex_file.GetClassData(class_def); 2087 CHECK(class_data != NULL); 2088 ClassDataItemIterator it(dex_file, class_data); 2089 // Skip fields 2090 while (it.HasNextStaticField()) { 2091 it.Next(); 2092 } 2093 while (it.HasNextInstanceField()) { 2094 it.Next(); 2095 } 2096 // Process methods 2097 size_t class_def_method_index = 0; 2098 while (it.HasNextDirectMethod()) { 2099 if (it.GetMemberIndex() == method_idx) { 2100 return class_def_method_index; 2101 } 2102 class_def_method_index++; 2103 it.Next(); 2104 } 2105 while (it.HasNextVirtualMethod()) { 2106 if (it.GetMemberIndex() == method_idx) { 2107 return class_def_method_index; 2108 } 2109 class_def_method_index++; 2110 it.Next(); 2111 } 2112 DCHECK(!it.HasNext()); 2113 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2114 return 0; 2115} 2116 2117bool ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, OatFile::OatMethod* oat_method) { 2118 DCHECK(oat_method != nullptr); 2119 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2120 // method for direct methods (or virtual methods made direct). 2121 mirror::Class* declaring_class = method->GetDeclaringClass(); 2122 size_t oat_method_index; 2123 if (method->IsStatic() || method->IsDirect()) { 2124 // Simple case where the oat method index was stashed at load time. 2125 oat_method_index = method->GetMethodIndex(); 2126 } else { 2127 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2128 // by search for its position in the declared virtual methods. 2129 oat_method_index = declaring_class->NumDirectMethods(); 2130 size_t end = declaring_class->NumVirtualMethods(); 2131 bool found = false; 2132 for (size_t i = 0; i < end; i++) { 2133 if (declaring_class->GetVirtualMethod(i) == method) { 2134 found = true; 2135 break; 2136 } 2137 oat_method_index++; 2138 } 2139 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2140 } 2141 DCHECK_EQ(oat_method_index, 2142 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2143 method->GetDeclaringClass()->GetDexClassDefIndex(), 2144 method->GetDexMethodIndex())); 2145 OatFile::OatClass oat_class; 2146 if (!FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2147 declaring_class->GetDexClassDefIndex(), 2148 &oat_class)) { 2149 return false; 2150 } 2151 2152 *oat_method = oat_class.GetOatMethod(oat_method_index); 2153 return true; 2154} 2155 2156// Special case to get oat code without overwriting a trampoline. 2157const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2158 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2159 if (method->IsProxyMethod()) { 2160 return GetQuickProxyInvokeHandler(); 2161 } 2162 OatFile::OatMethod oat_method; 2163 const void* result = nullptr; 2164 if (FindOatMethodFor(method, &oat_method)) { 2165 result = oat_method.GetQuickCode(); 2166 } 2167 2168 if (result == nullptr) { 2169 if (method->IsNative()) { 2170 // No code and native? Use generic trampoline. 2171 result = GetQuickGenericJniTrampoline(); 2172 } else if (method->IsPortableCompiled()) { 2173 // No code? Do we expect portable code? 2174 result = GetQuickToPortableBridge(); 2175 } else { 2176 // No code? You must mean to go into the interpreter. 2177 result = GetQuickToInterpreterBridge(); 2178 } 2179 } 2180 return result; 2181} 2182 2183const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2184 bool* have_portable_code) { 2185 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2186 *have_portable_code = false; 2187 if (method->IsProxyMethod()) { 2188 return GetPortableProxyInvokeHandler(); 2189 } 2190 OatFile::OatMethod oat_method; 2191 const void* result = nullptr; 2192 const void* quick_code = nullptr; 2193 if (FindOatMethodFor(method, &oat_method)) { 2194 result = oat_method.GetPortableCode(); 2195 quick_code = oat_method.GetQuickCode(); 2196 } 2197 2198 if (result == nullptr) { 2199 if (quick_code == nullptr) { 2200 // No code? You must mean to go into the interpreter. 2201 result = GetPortableToInterpreterBridge(); 2202 } else { 2203 // No code? But there's quick code, so use a bridge. 2204 result = GetPortableToQuickBridge(); 2205 } 2206 } else { 2207 *have_portable_code = true; 2208 } 2209 return result; 2210} 2211 2212const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2213 uint32_t method_idx) { 2214 OatFile::OatClass oat_class; 2215 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2216 return nullptr; 2217 } 2218 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2219 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2220} 2221 2222const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2223 uint32_t method_idx) { 2224 OatFile::OatClass oat_class; 2225 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2226 return nullptr; 2227 } 2228 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2229 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2230} 2231 2232// Returns true if the method must run with interpreter, false otherwise. 2233static bool NeedsInterpreter( 2234 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2235 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2236 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2237 // No code: need interpreter. 2238 // May return true for native code, in the case of generic JNI 2239 // DCHECK(!method->IsNative()); 2240 return true; 2241 } 2242#ifdef ART_SEA_IR_MODE 2243 ScopedObjectAccess soa(Thread::Current()); 2244 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2245 LOG(INFO) << "Found " << PrettyMethod(method); 2246 return false; 2247 } 2248#endif 2249 // If interpreter mode is enabled, every method (except native and proxy) must 2250 // be run with interpreter. 2251 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2252 !method->IsNative() && !method->IsProxyMethod(); 2253} 2254 2255void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2256 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2257 if (klass->NumDirectMethods() == 0) { 2258 return; // No direct methods => no static methods. 2259 } 2260 Runtime* runtime = Runtime::Current(); 2261 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2262 return; // OAT file unavailable. 2263 } 2264 const DexFile& dex_file = klass->GetDexFile(); 2265 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2266 CHECK(dex_class_def != nullptr); 2267 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2268 // There should always be class data if there were direct methods. 2269 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2270 ClassDataItemIterator it(dex_file, class_data); 2271 // Skip fields 2272 while (it.HasNextStaticField()) { 2273 it.Next(); 2274 } 2275 while (it.HasNextInstanceField()) { 2276 it.Next(); 2277 } 2278 OatFile::OatClass oat_class; 2279 bool has_oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class); 2280 // Link the code of methods skipped by LinkCode. 2281 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2282 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2283 if (!method->IsStatic()) { 2284 // Only update static methods. 2285 continue; 2286 } 2287 const void* portable_code = nullptr; 2288 const void* quick_code = nullptr; 2289 if (has_oat_class) { 2290 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2291 portable_code = oat_method.GetPortableCode(); 2292 quick_code = oat_method.GetQuickCode(); 2293 } 2294 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2295 bool have_portable_code = false; 2296 if (enter_interpreter) { 2297 // Use interpreter entry point. 2298 // Check whether the method is native, in which case it's generic JNI. 2299 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2300 quick_code = GetQuickGenericJniTrampoline(); 2301 portable_code = GetPortableToQuickBridge(); 2302 } else { 2303 portable_code = GetPortableToInterpreterBridge(); 2304 quick_code = GetQuickToInterpreterBridge(); 2305 } 2306 } else { 2307 if (portable_code == nullptr) { 2308 portable_code = GetPortableToQuickBridge(); 2309 } else { 2310 have_portable_code = true; 2311 } 2312 if (quick_code == nullptr) { 2313 quick_code = GetQuickToPortableBridge(); 2314 } 2315 } 2316 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2317 have_portable_code); 2318 } 2319 // Ignore virtual methods on the iterator. 2320} 2321 2322void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 2323 const DexFile& dex_file, uint32_t dex_method_index, 2324 uint32_t method_index) { 2325 if (Runtime::Current()->IsCompiler()) { 2326 // The following code only applies to a non-compiler runtime. 2327 return; 2328 } 2329 // Method shouldn't have already been linked. 2330 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2331 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2332 if (oat_class != nullptr) { 2333 // Every kind of method should at least get an invoke stub from the oat_method. 2334 // non-abstract methods also get their code pointers. 2335 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2336 oat_method.LinkMethod(method.Get()); 2337 } 2338 2339 // Install entry point from interpreter. 2340 bool enter_interpreter = NeedsInterpreter(method.Get(), 2341 method->GetEntryPointFromQuickCompiledCode(), 2342 method->GetEntryPointFromPortableCompiledCode()); 2343 if (enter_interpreter && !method->IsNative()) { 2344 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2345 } else { 2346 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2347 } 2348 2349 if (method->IsAbstract()) { 2350 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2351 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2352 return; 2353 } 2354 2355 bool have_portable_code = false; 2356 if (method->IsStatic() && !method->IsConstructor()) { 2357 // For static methods excluding the class initializer, install the trampoline. 2358 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2359 // after initializing class (see ClassLinker::InitializeClass method). 2360 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2361 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2362 } else if (enter_interpreter) { 2363 if (!method->IsNative()) { 2364 // Set entry point from compiled code if there's no code or in interpreter only mode. 2365 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2366 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2367 } else { 2368 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2369 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2370 } 2371 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2372 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2373 have_portable_code = true; 2374 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2375 } else { 2376 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2377 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2378 } 2379 2380 if (method->IsNative()) { 2381 // Unregistering restores the dlsym lookup stub. 2382 method->UnregisterNative(Thread::Current()); 2383 2384 if (enter_interpreter) { 2385 // We have a native method here without code. Then it should have either the GenericJni 2386 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2387 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2388 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2389 } 2390 } 2391 2392 // Allow instrumentation its chance to hijack code. 2393 Runtime* runtime = Runtime::Current(); 2394 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2395 method->GetEntryPointFromQuickCompiledCode(), 2396 method->GetEntryPointFromPortableCompiledCode(), 2397 have_portable_code); 2398} 2399 2400void ClassLinker::LoadClass(const DexFile& dex_file, 2401 const DexFile::ClassDef& dex_class_def, 2402 Handle<mirror::Class> klass, 2403 mirror::ClassLoader* class_loader) { 2404 CHECK(klass.Get() != NULL); 2405 CHECK(klass->GetDexCache() != NULL); 2406 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2407 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2408 CHECK(descriptor != NULL); 2409 2410 klass->SetClass(GetClassRoot(kJavaLangClass)); 2411 if (kUseBakerOrBrooksReadBarrier) { 2412 klass->AssertReadBarrierPointer(); 2413 } 2414 uint32_t access_flags = dex_class_def.access_flags_; 2415 // Make sure that none of our runtime-only flags are set. 2416 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2417 klass->SetAccessFlags(access_flags); 2418 klass->SetClassLoader(class_loader); 2419 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2420 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2421 2422 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2423 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2424 2425 const byte* class_data = dex_file.GetClassData(dex_class_def); 2426 if (class_data == NULL) { 2427 return; // no fields or methods - for example a marker interface 2428 } 2429 2430 OatFile::OatClass oat_class; 2431 if (Runtime::Current()->IsStarted() 2432 && !Runtime::Current()->UseCompileTimeClassPath() 2433 && FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class)) { 2434 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2435 } else { 2436 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2437 } 2438} 2439 2440void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2441 const byte* class_data, 2442 Handle<mirror::Class> klass, 2443 mirror::ClassLoader* class_loader, 2444 const OatFile::OatClass* oat_class) { 2445 // Load fields. 2446 ClassDataItemIterator it(dex_file, class_data); 2447 Thread* self = Thread::Current(); 2448 if (it.NumStaticFields() != 0) { 2449 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2450 if (UNLIKELY(statics == NULL)) { 2451 CHECK(self->IsExceptionPending()); // OOME. 2452 return; 2453 } 2454 klass->SetSFields(statics); 2455 } 2456 if (it.NumInstanceFields() != 0) { 2457 mirror::ObjectArray<mirror::ArtField>* fields = 2458 AllocArtFieldArray(self, it.NumInstanceFields()); 2459 if (UNLIKELY(fields == NULL)) { 2460 CHECK(self->IsExceptionPending()); // OOME. 2461 return; 2462 } 2463 klass->SetIFields(fields); 2464 } 2465 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2466 StackHandleScope<1> hs(self); 2467 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2468 if (UNLIKELY(sfield.Get() == NULL)) { 2469 CHECK(self->IsExceptionPending()); // OOME. 2470 return; 2471 } 2472 klass->SetStaticField(i, sfield.Get()); 2473 LoadField(dex_file, it, klass, sfield); 2474 } 2475 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2476 StackHandleScope<1> hs(self); 2477 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2478 if (UNLIKELY(ifield.Get() == NULL)) { 2479 CHECK(self->IsExceptionPending()); // OOME. 2480 return; 2481 } 2482 klass->SetInstanceField(i, ifield.Get()); 2483 LoadField(dex_file, it, klass, ifield); 2484 } 2485 2486 // Load methods. 2487 if (it.NumDirectMethods() != 0) { 2488 // TODO: append direct methods to class object 2489 mirror::ObjectArray<mirror::ArtMethod>* directs = 2490 AllocArtMethodArray(self, it.NumDirectMethods()); 2491 if (UNLIKELY(directs == NULL)) { 2492 CHECK(self->IsExceptionPending()); // OOME. 2493 return; 2494 } 2495 klass->SetDirectMethods(directs); 2496 } 2497 if (it.NumVirtualMethods() != 0) { 2498 // TODO: append direct methods to class object 2499 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2500 AllocArtMethodArray(self, it.NumVirtualMethods()); 2501 if (UNLIKELY(virtuals == NULL)) { 2502 CHECK(self->IsExceptionPending()); // OOME. 2503 return; 2504 } 2505 klass->SetVirtualMethods(virtuals); 2506 } 2507 size_t class_def_method_index = 0; 2508 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2509 StackHandleScope<1> hs(self); 2510 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2511 if (UNLIKELY(method.Get() == NULL)) { 2512 CHECK(self->IsExceptionPending()); // OOME. 2513 return; 2514 } 2515 klass->SetDirectMethod(i, method.Get()); 2516 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2517 method->SetMethodIndex(class_def_method_index); 2518 class_def_method_index++; 2519 } 2520 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2521 StackHandleScope<1> hs(self); 2522 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2523 if (UNLIKELY(method.Get() == NULL)) { 2524 CHECK(self->IsExceptionPending()); // OOME. 2525 return; 2526 } 2527 klass->SetVirtualMethod(i, method.Get()); 2528 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2529 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2530 class_def_method_index++; 2531 } 2532 DCHECK(!it.HasNext()); 2533} 2534 2535void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2536 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2537 uint32_t field_idx = it.GetMemberIndex(); 2538 dst->SetDexFieldIndex(field_idx); 2539 dst->SetDeclaringClass(klass.Get()); 2540 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2541} 2542 2543mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2544 const ClassDataItemIterator& it, 2545 Handle<mirror::Class> klass) { 2546 uint32_t dex_method_idx = it.GetMemberIndex(); 2547 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2548 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2549 2550 mirror::ArtMethod* dst = AllocArtMethod(self); 2551 if (UNLIKELY(dst == NULL)) { 2552 CHECK(self->IsExceptionPending()); // OOME. 2553 return NULL; 2554 } 2555 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2556 2557 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2558 dst->SetDexMethodIndex(dex_method_idx); 2559 dst->SetDeclaringClass(klass.Get()); 2560 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2561 2562 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2563 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2564 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2565 2566 uint32_t access_flags = it.GetMemberAccessFlags(); 2567 2568 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2569 // Set finalizable flag on declaring class. 2570 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2571 // Void return type. 2572 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged. 2573 klass->SetFinalizable(); 2574 } else { 2575 std::string temp; 2576 const char* klass_descriptor = klass->GetDescriptor(&temp); 2577 // The Enum class declares a "final" finalize() method to prevent subclasses from 2578 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2579 // subclasses, so we exclude it here. 2580 // We also want to avoid setting the flag on Object, where we know that finalize() is 2581 // empty. 2582 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2583 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2584 klass->SetFinalizable(); 2585 } 2586 } 2587 } 2588 } else if (method_name[0] == '<') { 2589 // Fix broken access flags for initializers. Bug 11157540. 2590 bool is_init = (strcmp("<init>", method_name) == 0); 2591 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2592 if (UNLIKELY(!is_init && !is_clinit)) { 2593 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2594 } else { 2595 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2596 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2597 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2598 access_flags |= kAccConstructor; 2599 } 2600 } 2601 } 2602 dst->SetAccessFlags(access_flags); 2603 2604 self->EndAssertNoThreadSuspension(old_cause); 2605 return dst; 2606} 2607 2608void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2609 Thread* self = Thread::Current(); 2610 StackHandleScope<1> hs(self); 2611 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2612 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2613 AppendToBootClassPath(dex_file, dex_cache); 2614} 2615 2616void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2617 Handle<mirror::DexCache> dex_cache) { 2618 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2619 boot_class_path_.push_back(&dex_file); 2620 RegisterDexFile(dex_file, dex_cache); 2621} 2622 2623bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2624 dex_lock_.AssertSharedHeld(Thread::Current()); 2625 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2626 mirror::DexCache* dex_cache = GetDexCache(i); 2627 if (dex_cache->GetDexFile() == &dex_file) { 2628 return true; 2629 } 2630 } 2631 return false; 2632} 2633 2634bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2635 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2636 return IsDexFileRegisteredLocked(dex_file); 2637} 2638 2639void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2640 Handle<mirror::DexCache> dex_cache) { 2641 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2642 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2643 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2644 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2645 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2646 dex_cache->SetDexFile(&dex_file); 2647 if (log_new_dex_caches_roots_) { 2648 // TODO: This is not safe if we can remove dex caches. 2649 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2650 } 2651} 2652 2653void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2654 Thread* self = Thread::Current(); 2655 { 2656 ReaderMutexLock mu(self, dex_lock_); 2657 if (IsDexFileRegisteredLocked(dex_file)) { 2658 return; 2659 } 2660 } 2661 // Don't alloc while holding the lock, since allocation may need to 2662 // suspend all threads and another thread may need the dex_lock_ to 2663 // get to a suspend point. 2664 StackHandleScope<1> hs(self); 2665 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2666 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2667 { 2668 WriterMutexLock mu(self, dex_lock_); 2669 if (IsDexFileRegisteredLocked(dex_file)) { 2670 return; 2671 } 2672 RegisterDexFileLocked(dex_file, dex_cache); 2673 } 2674} 2675 2676void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2677 Handle<mirror::DexCache> dex_cache) { 2678 WriterMutexLock mu(Thread::Current(), dex_lock_); 2679 RegisterDexFileLocked(dex_file, dex_cache); 2680} 2681 2682mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2683 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2684 // Search assuming unique-ness of dex file. 2685 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2686 mirror::DexCache* dex_cache = GetDexCache(i); 2687 if (dex_cache->GetDexFile() == &dex_file) { 2688 return dex_cache; 2689 } 2690 } 2691 // Search matching by location name. 2692 std::string location(dex_file.GetLocation()); 2693 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2694 mirror::DexCache* dex_cache = GetDexCache(i); 2695 if (dex_cache->GetDexFile()->GetLocation() == location) { 2696 return dex_cache; 2697 } 2698 } 2699 // Failure, dump diagnostic and abort. 2700 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2701 mirror::DexCache* dex_cache = GetDexCache(i); 2702 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2703 } 2704 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2705 return NULL; 2706} 2707 2708void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2709 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2710 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2711 mirror::DexCache* dex_cache = GetDexCache(i); 2712 dex_cache->Fixup(resolution_method); 2713 } 2714} 2715 2716mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2717 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 2718 if (UNLIKELY(klass == NULL)) { 2719 return NULL; 2720 } 2721 return InitializePrimitiveClass(klass, type); 2722} 2723 2724mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2725 Primitive::Type type) { 2726 CHECK(primitive_class != NULL); 2727 // Must hold lock on object when initializing. 2728 Thread* self = Thread::Current(); 2729 StackHandleScope<1> hs(self); 2730 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2731 ObjectLock<mirror::Class> lock(self, h_class); 2732 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2733 primitive_class->SetPrimitiveType(type); 2734 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2735 const char* descriptor = Primitive::Descriptor(type); 2736 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2737 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2738 return primitive_class; 2739} 2740 2741// Create an array class (i.e. the class object for the array, not the 2742// array itself). "descriptor" looks like "[C" or "[[[[B" or 2743// "[Ljava/lang/String;". 2744// 2745// If "descriptor" refers to an array of primitives, look up the 2746// primitive type's internally-generated class object. 2747// 2748// "class_loader" is the class loader of the class that's referring to 2749// us. It's used to ensure that we're looking for the element type in 2750// the right context. It does NOT become the class loader for the 2751// array class; that always comes from the base element class. 2752// 2753// Returns NULL with an exception raised on failure. 2754mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2755 Handle<mirror::ClassLoader> class_loader) { 2756 // Identify the underlying component type 2757 CHECK_EQ('[', descriptor[0]); 2758 StackHandleScope<2> hs(self); 2759 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2760 if (component_type.Get() == nullptr) { 2761 DCHECK(self->IsExceptionPending()); 2762 // We need to accept erroneous classes as component types. 2763 component_type.Assign(LookupClass(descriptor + 1, class_loader.Get())); 2764 if (component_type.Get() == nullptr) { 2765 DCHECK(self->IsExceptionPending()); 2766 return nullptr; 2767 } else { 2768 self->ClearException(); 2769 } 2770 } 2771 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2772 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2773 return nullptr; 2774 } 2775 // See if the component type is already loaded. Array classes are 2776 // always associated with the class loader of their underlying 2777 // element type -- an array of Strings goes with the loader for 2778 // java/lang/String -- so we need to look for it there. (The 2779 // caller should have checked for the existence of the class 2780 // before calling here, but they did so with *their* class loader, 2781 // not the component type's loader.) 2782 // 2783 // If we find it, the caller adds "loader" to the class' initiating 2784 // loader list, which should prevent us from going through this again. 2785 // 2786 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2787 // are the same, because our caller (FindClass) just did the 2788 // lookup. (Even if we get this wrong we still have correct behavior, 2789 // because we effectively do this lookup again when we add the new 2790 // class to the hash table --- necessary because of possible races with 2791 // other threads.) 2792 if (class_loader.Get() != component_type->GetClassLoader()) { 2793 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2794 if (new_class != NULL) { 2795 return new_class; 2796 } 2797 } 2798 2799 // Fill out the fields in the Class. 2800 // 2801 // It is possible to execute some methods against arrays, because 2802 // all arrays are subclasses of java_lang_Object_, so we need to set 2803 // up a vtable. We can just point at the one in java_lang_Object_. 2804 // 2805 // Array classes are simple enough that we don't need to do a full 2806 // link step. 2807 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2808 if (UNLIKELY(!init_done_)) { 2809 // Classes that were hand created, ie not by FindSystemClass 2810 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2811 new_class.Assign(GetClassRoot(kClassArrayClass)); 2812 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2813 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2814 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2815 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2816 } else if (strcmp(descriptor, 2817 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2818 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2819 } else if (strcmp(descriptor, 2820 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2821 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2822 } else if (strcmp(descriptor, "[C") == 0) { 2823 new_class.Assign(GetClassRoot(kCharArrayClass)); 2824 } else if (strcmp(descriptor, "[I") == 0) { 2825 new_class.Assign(GetClassRoot(kIntArrayClass)); 2826 } 2827 } 2828 if (new_class.Get() == nullptr) { 2829 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 2830 if (new_class.Get() == nullptr) { 2831 return nullptr; 2832 } 2833 new_class->SetComponentType(component_type.Get()); 2834 } 2835 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2836 DCHECK(new_class->GetComponentType() != NULL); 2837 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2838 new_class->SetSuperClass(java_lang_Object); 2839 new_class->SetVTable(java_lang_Object->GetVTable()); 2840 new_class->SetPrimitiveType(Primitive::kPrimNot); 2841 new_class->SetClassLoader(component_type->GetClassLoader()); 2842 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 2843 new_class->PopulateEmbeddedImtAndVTable(); 2844 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2845 // don't need to set new_class->SetObjectSize(..) 2846 // because Object::SizeOf delegates to Array::SizeOf 2847 2848 2849 // All arrays have java/lang/Cloneable and java/io/Serializable as 2850 // interfaces. We need to set that up here, so that stuff like 2851 // "instanceof" works right. 2852 // 2853 // Note: The GC could run during the call to FindSystemClass, 2854 // so we need to make sure the class object is GC-valid while we're in 2855 // there. Do this by clearing the interface list so the GC will just 2856 // think that the entries are null. 2857 2858 2859 // Use the single, global copies of "interfaces" and "iftable" 2860 // (remember not to free them for arrays). 2861 { 2862 mirror::IfTable* array_iftable = array_iftable_.Read(); 2863 CHECK(array_iftable != nullptr); 2864 new_class->SetIfTable(array_iftable); 2865 } 2866 2867 // Inherit access flags from the component type. 2868 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2869 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2870 access_flags &= kAccJavaFlagsMask; 2871 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2872 // and remove "interface". 2873 access_flags |= kAccAbstract | kAccFinal; 2874 access_flags &= ~kAccInterface; 2875 2876 new_class->SetAccessFlags(access_flags); 2877 2878 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2879 if (existing == nullptr) { 2880 return new_class.Get(); 2881 } 2882 // Another thread must have loaded the class after we 2883 // started but before we finished. Abandon what we've 2884 // done. 2885 // 2886 // (Yes, this happens.) 2887 2888 return existing; 2889} 2890 2891mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2892 switch (type) { 2893 case 'B': 2894 return GetClassRoot(kPrimitiveByte); 2895 case 'C': 2896 return GetClassRoot(kPrimitiveChar); 2897 case 'D': 2898 return GetClassRoot(kPrimitiveDouble); 2899 case 'F': 2900 return GetClassRoot(kPrimitiveFloat); 2901 case 'I': 2902 return GetClassRoot(kPrimitiveInt); 2903 case 'J': 2904 return GetClassRoot(kPrimitiveLong); 2905 case 'S': 2906 return GetClassRoot(kPrimitiveShort); 2907 case 'Z': 2908 return GetClassRoot(kPrimitiveBoolean); 2909 case 'V': 2910 return GetClassRoot(kPrimitiveVoid); 2911 default: 2912 break; 2913 } 2914 std::string printable_type(PrintableChar(type)); 2915 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2916 return NULL; 2917} 2918 2919mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2920 size_t hash) { 2921 if (VLOG_IS_ON(class_linker)) { 2922 mirror::DexCache* dex_cache = klass->GetDexCache(); 2923 std::string source; 2924 if (dex_cache != NULL) { 2925 source += " from "; 2926 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2927 } 2928 LOG(INFO) << "Loaded class " << descriptor << source; 2929 } 2930 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2931 mirror::Class* existing = 2932 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2933 if (existing != NULL) { 2934 return existing; 2935 } 2936 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == NULL && 2937 dex_cache_image_class_lookup_required_) { 2938 // Check a class loaded with the system class loader matches one in the image if the class 2939 // is in the image. 2940 existing = LookupClassFromImage(descriptor); 2941 if (existing != NULL) { 2942 CHECK(klass == existing); 2943 } 2944 } 2945 VerifyObject(klass); 2946 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 2947 if (log_new_class_table_roots_) { 2948 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 2949 } 2950 return NULL; 2951} 2952 2953mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 2954 size_t hash) { 2955 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2956 mirror::Class* existing = 2957 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2958 2959 if (existing == nullptr) { 2960 CHECK(klass->IsProxyClass()); 2961 return nullptr; 2962 } 2963 2964 CHECK_NE(existing, klass) << descriptor; 2965 CHECK(!existing->IsResolved()) << descriptor; 2966 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 2967 2968 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2969 ++it) { 2970 mirror::Class* klass = it->second.Read(); 2971 if (klass == existing) { 2972 class_table_.erase(it); 2973 break; 2974 } 2975 } 2976 2977 CHECK(!klass->IsTemp()) << descriptor; 2978 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 2979 dex_cache_image_class_lookup_required_) { 2980 // Check a class loaded with the system class loader matches one in the image if the class 2981 // is in the image. 2982 existing = LookupClassFromImage(descriptor); 2983 if (existing != nullptr) { 2984 CHECK(klass == existing) << descriptor; 2985 } 2986 } 2987 VerifyObject(klass); 2988 2989 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 2990 if (log_new_class_table_roots_) { 2991 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 2992 } 2993 2994 return existing; 2995} 2996 2997bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2998 size_t hash = Hash(descriptor); 2999 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3000 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3001 it != end && it->first == hash; 3002 ++it) { 3003 mirror::Class* klass = it->second.Read(); 3004 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3005 class_table_.erase(it); 3006 return true; 3007 } 3008 } 3009 return false; 3010} 3011 3012mirror::Class* ClassLinker::LookupClass(const char* descriptor, 3013 const mirror::ClassLoader* class_loader) { 3014 size_t hash = Hash(descriptor); 3015 { 3016 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3017 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3018 if (result != NULL) { 3019 return result; 3020 } 3021 } 3022 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 3023 return NULL; 3024 } else { 3025 // Lookup failed but need to search dex_caches_. 3026 mirror::Class* result = LookupClassFromImage(descriptor); 3027 if (result != NULL) { 3028 InsertClass(descriptor, result, hash); 3029 } else { 3030 // Searching the image dex files/caches failed, we don't want to get into this situation 3031 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3032 // classes into the class table. 3033 const int32_t kMaxFailedDexCacheLookups = 1000; 3034 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3035 MoveImageClassesToClassTable(); 3036 } 3037 } 3038 return result; 3039 } 3040} 3041 3042mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3043 const mirror::ClassLoader* class_loader, 3044 size_t hash) { 3045 auto end = class_table_.end(); 3046 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3047 mirror::Class* klass = it->second.Read(); 3048 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3049 if (kIsDebugBuild) { 3050 // Check for duplicates in the table. 3051 for (++it; it != end && it->first == hash; ++it) { 3052 mirror::Class* klass2 = it->second.Read(); 3053 CHECK(!(klass2->GetClassLoader() == class_loader && 3054 klass2->DescriptorEquals(descriptor))) 3055 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3056 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3057 } 3058 } 3059 return klass; 3060 } 3061 } 3062 return NULL; 3063} 3064 3065static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3066 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3067 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3068 CHECK(image != NULL); 3069 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3070 return root->AsObjectArray<mirror::DexCache>(); 3071} 3072 3073void ClassLinker::MoveImageClassesToClassTable() { 3074 Thread* self = Thread::Current(); 3075 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3076 if (!dex_cache_image_class_lookup_required_) { 3077 return; // All dex cache classes are already in the class table. 3078 } 3079 const char* old_no_suspend_cause = 3080 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 3081 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3082 std::string temp; 3083 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3084 mirror::DexCache* dex_cache = dex_caches->Get(i); 3085 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3086 for (int32_t j = 0; j < types->GetLength(); j++) { 3087 mirror::Class* klass = types->Get(j); 3088 if (klass != NULL) { 3089 DCHECK(klass->GetClassLoader() == NULL); 3090 const char* descriptor = klass->GetDescriptor(&temp); 3091 size_t hash = Hash(descriptor); 3092 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 3093 if (existing != NULL) { 3094 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3095 << PrettyClassAndClassLoader(klass); 3096 } else { 3097 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3098 if (log_new_class_table_roots_) { 3099 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3100 } 3101 } 3102 } 3103 } 3104 } 3105 dex_cache_image_class_lookup_required_ = false; 3106 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3107} 3108 3109mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3110 Thread* self = Thread::Current(); 3111 const char* old_no_suspend_cause = 3112 self->StartAssertNoThreadSuspension("Image class lookup"); 3113 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3114 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3115 mirror::DexCache* dex_cache = dex_caches->Get(i); 3116 const DexFile* dex_file = dex_cache->GetDexFile(); 3117 // Try binary searching the string/type index. 3118 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3119 if (string_id != NULL) { 3120 const DexFile::TypeId* type_id = 3121 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3122 if (type_id != NULL) { 3123 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3124 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3125 if (klass != NULL) { 3126 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3127 return klass; 3128 } 3129 } 3130 } 3131 } 3132 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3133 return NULL; 3134} 3135 3136void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3137 result.clear(); 3138 if (dex_cache_image_class_lookup_required_) { 3139 MoveImageClassesToClassTable(); 3140 } 3141 size_t hash = Hash(descriptor); 3142 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3143 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3144 it != end && it->first == hash; ++it) { 3145 mirror::Class* klass = it->second.Read(); 3146 if (klass->DescriptorEquals(descriptor)) { 3147 result.push_back(klass); 3148 } 3149 } 3150} 3151 3152void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 3153 // TODO: assert that the monitor on the Class is held 3154 Thread* self = Thread::Current(); 3155 ObjectLock<mirror::Class> lock(self, klass); 3156 3157 // Don't attempt to re-verify if already sufficiently verified. 3158 if (klass->IsVerified() || 3159 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 3160 return; 3161 } 3162 3163 // The class might already be erroneous, for example at compile time if we attempted to verify 3164 // this class as a parent to another. 3165 if (klass->IsErroneous()) { 3166 ThrowEarlierClassFailure(klass.Get()); 3167 return; 3168 } 3169 3170 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3171 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3172 } else { 3173 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3174 << PrettyClass(klass.Get()); 3175 CHECK(!Runtime::Current()->IsCompiler()); 3176 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3177 } 3178 3179 // Skip verification if disabled. 3180 if (!Runtime::Current()->IsVerificationEnabled()) { 3181 klass->SetStatus(mirror::Class::kStatusVerified, self); 3182 return; 3183 } 3184 3185 // Verify super class. 3186 StackHandleScope<2> hs(self); 3187 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3188 if (super.Get() != NULL) { 3189 // Acquire lock to prevent races on verifying the super class. 3190 ObjectLock<mirror::Class> lock(self, super); 3191 3192 if (!super->IsVerified() && !super->IsErroneous()) { 3193 VerifyClass(super); 3194 } 3195 if (!super->IsCompileTimeVerified()) { 3196 std::string error_msg( 3197 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3198 PrettyDescriptor(klass.Get()).c_str(), 3199 PrettyDescriptor(super.Get()).c_str())); 3200 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3201 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3202 if (cause.Get() != nullptr) { 3203 self->ClearException(); 3204 } 3205 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3206 if (cause.Get() != nullptr) { 3207 self->GetException(nullptr)->SetCause(cause.Get()); 3208 } 3209 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3210 if (Runtime::Current()->IsCompiler()) { 3211 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3212 } 3213 klass->SetStatus(mirror::Class::kStatusError, self); 3214 return; 3215 } 3216 } 3217 3218 // Try to use verification information from the oat file, otherwise do runtime verification. 3219 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3220 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3221 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3222 if (oat_file_class_status == mirror::Class::kStatusError) { 3223 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3224 << PrettyDescriptor(klass.Get()) << " in " 3225 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3226 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3227 PrettyDescriptor(klass.Get()).c_str()); 3228 klass->SetStatus(mirror::Class::kStatusError, self); 3229 return; 3230 } 3231 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3232 std::string error_msg; 3233 if (!preverified) { 3234 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 3235 Runtime::Current()->IsCompiler(), 3236 &error_msg); 3237 } 3238 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3239 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3240 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3241 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3242 << " because: " << error_msg; 3243 } 3244 self->AssertNoPendingException(); 3245 // Make sure all classes referenced by catch blocks are resolved. 3246 ResolveClassExceptionHandlerTypes(dex_file, klass); 3247 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3248 // Even though there were no verifier failures we need to respect whether the super-class 3249 // was verified or requiring runtime reverification. 3250 if (super.Get() == NULL || super->IsVerified()) { 3251 klass->SetStatus(mirror::Class::kStatusVerified, self); 3252 } else { 3253 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3254 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3255 // Pretend a soft failure occured so that we don't consider the class verified below. 3256 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3257 } 3258 } else { 3259 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3260 // Soft failures at compile time should be retried at runtime. Soft 3261 // failures at runtime will be handled by slow paths in the generated 3262 // code. Set status accordingly. 3263 if (Runtime::Current()->IsCompiler()) { 3264 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3265 } else { 3266 klass->SetStatus(mirror::Class::kStatusVerified, self); 3267 } 3268 } 3269 } else { 3270 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3271 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3272 << " because: " << error_msg; 3273 self->AssertNoPendingException(); 3274 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3275 klass->SetStatus(mirror::Class::kStatusError, self); 3276 } 3277 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3278 // Class is verified so we don't need to do any access check on its methods. 3279 // Let the interpreter know it by setting the kAccPreverified flag onto each 3280 // method. 3281 // Note: we're going here during compilation and at runtime. When we set the 3282 // kAccPreverified flag when compiling image classes, the flag is recorded 3283 // in the image and is set when loading the image. 3284 klass->SetPreverifiedFlagOnAllMethods(); 3285 } 3286} 3287 3288bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3289 mirror::Class::Status& oat_file_class_status) { 3290 // If we're compiling, we can only verify the class using the oat file if 3291 // we are not compiling the image or if the class we're verifying is not part of 3292 // the app. In other words, we will only check for preverification of bootclasspath 3293 // classes. 3294 if (Runtime::Current()->IsCompiler()) { 3295 // Are we compiling the bootclasspath? 3296 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3297 return false; 3298 } 3299 // We are compiling an app (not the image). 3300 3301 // Is this an app class? (I.e. not a bootclasspath class) 3302 if (klass->GetClassLoader() != NULL) { 3303 return false; 3304 } 3305 } 3306 3307 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 3308 // Make this work with gtests, which do not set up the image properly. 3309 // TODO: we should clean up gtests to set up the image path properly. 3310 if (Runtime::Current()->IsCompiler() || (oat_file == NULL)) { 3311 return false; 3312 } 3313 3314 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3315 uint dex_location_checksum = dex_file.GetLocationChecksum(); 3316 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 3317 &dex_location_checksum); 3318 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3319 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3320 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3321 if (oat_file_class_status == mirror::Class::kStatusVerified || 3322 oat_file_class_status == mirror::Class::kStatusInitialized) { 3323 return true; 3324 } 3325 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3326 // Compile time verification failed with a soft error. Compile time verification can fail 3327 // because we have incomplete type information. Consider the following: 3328 // class ... { 3329 // Foo x; 3330 // .... () { 3331 // if (...) { 3332 // v1 gets assigned a type of resolved class Foo 3333 // } else { 3334 // v1 gets assigned a type of unresolved class Bar 3335 // } 3336 // iput x = v1 3337 // } } 3338 // when we merge v1 following the if-the-else it results in Conflict 3339 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3340 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3341 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3342 // at compile time). 3343 return false; 3344 } 3345 if (oat_file_class_status == mirror::Class::kStatusError) { 3346 // Compile time verification failed with a hard error. This is caused by invalid instructions 3347 // in the class. These errors are unrecoverable. 3348 return false; 3349 } 3350 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3351 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3352 // not loading the class. 3353 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3354 // isn't a problem and this case shouldn't occur 3355 return false; 3356 } 3357 std::string temp; 3358 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3359 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3360 << klass->GetDescriptor(&temp); 3361 3362 return false; 3363} 3364 3365void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3366 Handle<mirror::Class> klass) { 3367 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3368 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3369 } 3370 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3371 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3372 } 3373} 3374 3375void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3376 mirror::ArtMethod* method) { 3377 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3378 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3379 if (code_item == NULL) { 3380 return; // native or abstract method 3381 } 3382 if (code_item->tries_size_ == 0) { 3383 return; // nothing to process 3384 } 3385 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3386 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3387 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3388 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3389 CatchHandlerIterator iterator(handlers_ptr); 3390 for (; iterator.HasNext(); iterator.Next()) { 3391 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3392 // unresolved exception types will be ignored by exception delivery 3393 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3394 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3395 if (exception_type == NULL) { 3396 DCHECK(Thread::Current()->IsExceptionPending()); 3397 Thread::Current()->ClearException(); 3398 } 3399 } 3400 } 3401 handlers_ptr = iterator.EndDataPointer(); 3402 } 3403} 3404 3405static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3406static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3407 Handle<mirror::ArtMethod> prototype); 3408 3409mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3410 jobjectArray interfaces, jobject loader, 3411 jobjectArray methods, jobjectArray throws) { 3412 Thread* self = soa.Self(); 3413 StackHandleScope<8> hs(self); 3414 Handle<mirror::Class> klass(hs.NewHandle( 3415 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3416 if (klass.Get() == NULL) { 3417 CHECK(self->IsExceptionPending()); // OOME. 3418 return NULL; 3419 } 3420 DCHECK(klass->GetClass() != NULL); 3421 klass->SetObjectSize(sizeof(mirror::Proxy)); 3422 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 3423 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3424 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3425 klass->SetName(soa.Decode<mirror::String*>(name)); 3426 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3427 klass->SetDexCache(proxy_class->GetDexCache()); 3428 klass->SetStatus(mirror::Class::kStatusIdx, self); 3429 3430 // Instance fields are inherited, but we add a couple of static fields... 3431 { 3432 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3433 if (UNLIKELY(sfields == NULL)) { 3434 CHECK(self->IsExceptionPending()); // OOME. 3435 return NULL; 3436 } 3437 klass->SetSFields(sfields); 3438 } 3439 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3440 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3441 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3442 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3443 CHECK(self->IsExceptionPending()); // OOME. 3444 return nullptr; 3445 } 3446 klass->SetStaticField(0, interfaces_sfield.Get()); 3447 interfaces_sfield->SetDexFieldIndex(0); 3448 interfaces_sfield->SetDeclaringClass(klass.Get()); 3449 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3450 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3451 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3452 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3453 CHECK(self->IsExceptionPending()); // OOME. 3454 return nullptr; 3455 } 3456 klass->SetStaticField(1, throws_sfield.Get()); 3457 throws_sfield->SetDexFieldIndex(1); 3458 throws_sfield->SetDeclaringClass(klass.Get()); 3459 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3460 3461 // Proxies have 1 direct method, the constructor 3462 { 3463 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3464 if (UNLIKELY(directs == nullptr)) { 3465 CHECK(self->IsExceptionPending()); // OOME. 3466 return nullptr; 3467 } 3468 klass->SetDirectMethods(directs); 3469 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3470 if (UNLIKELY(constructor == nullptr)) { 3471 CHECK(self->IsExceptionPending()); // OOME. 3472 return nullptr; 3473 } 3474 klass->SetDirectMethod(0, constructor); 3475 } 3476 3477 // Create virtual method using specified prototypes. 3478 size_t num_virtual_methods = 3479 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3480 { 3481 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3482 num_virtual_methods); 3483 if (UNLIKELY(virtuals == NULL)) { 3484 CHECK(self->IsExceptionPending()); // OOME. 3485 return NULL; 3486 } 3487 klass->SetVirtualMethods(virtuals); 3488 } 3489 for (size_t i = 0; i < num_virtual_methods; ++i) { 3490 StackHandleScope<1> hs(self); 3491 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3492 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3493 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3494 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3495 if (UNLIKELY(clone == nullptr)) { 3496 CHECK(self->IsExceptionPending()); // OOME. 3497 return nullptr; 3498 } 3499 klass->SetVirtualMethod(i, clone); 3500 } 3501 3502 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3503 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3504 self->AssertNoPendingException(); 3505 3506 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3507 mirror::Class* new_class = nullptr; 3508 { 3509 ObjectLock<mirror::Class> resolution_lock(self, klass); // Must hold lock on object when resolved. 3510 // Link the fields and virtual methods, creating vtable and iftables 3511 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3512 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3513 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3514 klass->SetStatus(mirror::Class::kStatusError, self); 3515 return nullptr; 3516 } 3517 } 3518 3519 CHECK(klass->IsRetired()); 3520 CHECK_NE(klass.Get(), new_class); 3521 klass.Assign(new_class); 3522 3523 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3524 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3525 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3526 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3527 3528 { 3529 // Lock on klass is released. Lock new class object. 3530 ObjectLock<mirror::Class> initialization_lock(self, klass); 3531 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3532 } 3533 3534 // sanity checks 3535 if (kIsDebugBuild) { 3536 CHECK(klass->GetIFields() == nullptr); 3537 CheckProxyConstructor(klass->GetDirectMethod(0)); 3538 for (size_t i = 0; i < num_virtual_methods; ++i) { 3539 StackHandleScope<2> hs(self); 3540 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3541 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3542 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3543 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3544 CheckProxyMethod(virtual_method, prototype); 3545 } 3546 3547 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3548 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3549 decoded_name->ToModifiedUtf8().c_str())); 3550 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3551 3552 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3553 decoded_name->ToModifiedUtf8().c_str())); 3554 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3555 3556 CHECK_EQ(klass.Get()->GetInterfaces(), 3557 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3558 CHECK_EQ(klass.Get()->GetThrows(), 3559 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3560 } 3561 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3562 CHECK(existing == nullptr); 3563 return klass.Get(); 3564} 3565 3566std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3567 DCHECK(proxy_class->IsProxyClass()); 3568 mirror::String* name = proxy_class->GetName(); 3569 DCHECK(name != NULL); 3570 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3571} 3572 3573mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3574 mirror::ArtMethod* proxy_method) { 3575 DCHECK(proxy_class->IsProxyClass()); 3576 DCHECK(proxy_method->IsProxyMethod()); 3577 // Locate the dex cache of the original interface/Object 3578 mirror::DexCache* dex_cache = nullptr; 3579 { 3580 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3581 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3582 mirror::DexCache* a_dex_cache = GetDexCache(i); 3583 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3584 dex_cache = a_dex_cache; 3585 break; 3586 } 3587 } 3588 } 3589 CHECK(dex_cache != nullptr); 3590 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3591 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3592 CHECK(resolved_method != nullptr); 3593 return resolved_method; 3594} 3595 3596 3597mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3598 Handle<mirror::Class> klass, 3599 mirror::Class* proxy_class) { 3600 // Create constructor for Proxy that must initialize h 3601 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3602 proxy_class->GetDirectMethods(); 3603 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3604 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3605 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3606 // code_ too) 3607 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3608 if (constructor == nullptr) { 3609 CHECK(self->IsExceptionPending()); // OOME. 3610 return nullptr; 3611 } 3612 // Make this constructor public and fix the class to be our Proxy version 3613 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3614 constructor->SetDeclaringClass(klass.Get()); 3615 return constructor; 3616} 3617 3618static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3619 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3620 CHECK(constructor->IsConstructor()); 3621 CHECK_STREQ(constructor->GetName(), "<init>"); 3622 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3623 "(Ljava/lang/reflect/InvocationHandler;)V"); 3624 DCHECK(constructor->IsPublic()); 3625} 3626 3627mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3628 Handle<mirror::Class> klass, 3629 Handle<mirror::ArtMethod> prototype) { 3630 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3631 // prototype method 3632 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3633 prototype.Get()); 3634 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3635 // as necessary 3636 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3637 if (UNLIKELY(method == NULL)) { 3638 CHECK(self->IsExceptionPending()); // OOME. 3639 return NULL; 3640 } 3641 3642 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3643 // the intersection of throw exceptions as defined in Proxy 3644 method->SetDeclaringClass(klass.Get()); 3645 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3646 3647 // At runtime the method looks like a reference and argument saving method, clone the code 3648 // related parameters from this method. 3649 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3650 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3651 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3652 3653 return method; 3654} 3655 3656static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3657 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3658 // Basic sanity 3659 CHECK(!prototype->IsFinal()); 3660 CHECK(method->IsFinal()); 3661 CHECK(!method->IsAbstract()); 3662 3663 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3664 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3665 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3666 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 3667 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 3668 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3669 3670 MethodHelper mh(method); 3671 MethodHelper mh2(prototype); 3672 CHECK_STREQ(method->GetName(), prototype->GetName()); 3673 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3674 // More complex sanity - via dex cache 3675 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3676} 3677 3678static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3679 bool can_init_parents) 3680 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3681 if (can_init_statics && can_init_parents) { 3682 return true; 3683 } 3684 if (!can_init_statics) { 3685 // Check if there's a class initializer. 3686 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3687 if (clinit != NULL) { 3688 return false; 3689 } 3690 // Check if there are encoded static values needing initialization. 3691 if (klass->NumStaticFields() != 0) { 3692 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3693 DCHECK(dex_class_def != NULL); 3694 if (dex_class_def->static_values_off_ != 0) { 3695 return false; 3696 } 3697 } 3698 } 3699 if (!klass->IsInterface() && klass->HasSuperClass()) { 3700 mirror::Class* super_class = klass->GetSuperClass(); 3701 if (!can_init_parents && !super_class->IsInitialized()) { 3702 return false; 3703 } else { 3704 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3705 return false; 3706 } 3707 } 3708 } 3709 return true; 3710} 3711 3712bool ClassLinker::IsInitialized() const { 3713 return init_done_; 3714} 3715 3716bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3717 bool can_init_parents) { 3718 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3719 3720 // Are we already initialized and therefore done? 3721 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3722 // an initialized class will never change its state. 3723 if (klass->IsInitialized()) { 3724 return true; 3725 } 3726 3727 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3728 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3729 return false; 3730 } 3731 3732 Thread* self = Thread::Current(); 3733 uint64_t t0; 3734 { 3735 ObjectLock<mirror::Class> lock(self, klass); 3736 3737 // Re-check under the lock in case another thread initialized ahead of us. 3738 if (klass->IsInitialized()) { 3739 return true; 3740 } 3741 3742 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3743 if (klass->IsErroneous()) { 3744 ThrowEarlierClassFailure(klass.Get()); 3745 return false; 3746 } 3747 3748 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3749 3750 if (!klass->IsVerified()) { 3751 VerifyClass(klass); 3752 if (!klass->IsVerified()) { 3753 // We failed to verify, expect either the klass to be erroneous or verification failed at 3754 // compile time. 3755 if (klass->IsErroneous()) { 3756 CHECK(self->IsExceptionPending()); 3757 } else { 3758 CHECK(Runtime::Current()->IsCompiler()); 3759 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3760 } 3761 return false; 3762 } 3763 } 3764 3765 // If the class is kStatusInitializing, either this thread is 3766 // initializing higher up the stack or another thread has beat us 3767 // to initializing and we need to wait. Either way, this 3768 // invocation of InitializeClass will not be responsible for 3769 // running <clinit> and will return. 3770 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3771 // We caught somebody else in the act; was it us? 3772 if (klass->GetClinitThreadId() == self->GetTid()) { 3773 // Yes. That's fine. Return so we can continue initializing. 3774 return true; 3775 } 3776 // No. That's fine. Wait for another thread to finish initializing. 3777 return WaitForInitializeClass(klass, self, lock); 3778 } 3779 3780 if (!ValidateSuperClassDescriptors(klass)) { 3781 klass->SetStatus(mirror::Class::kStatusError, self); 3782 return false; 3783 } 3784 3785 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3786 3787 // From here out other threads may observe that we're initializing and so changes of state 3788 // require the a notification. 3789 klass->SetClinitThreadId(self->GetTid()); 3790 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3791 3792 t0 = NanoTime(); 3793 } 3794 3795 // Initialize super classes, must be done while initializing for the JLS. 3796 if (!klass->IsInterface() && klass->HasSuperClass()) { 3797 mirror::Class* super_class = klass->GetSuperClass(); 3798 if (!super_class->IsInitialized()) { 3799 CHECK(!super_class->IsInterface()); 3800 CHECK(can_init_parents); 3801 StackHandleScope<1> hs(self); 3802 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3803 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3804 if (!super_initialized) { 3805 // The super class was verified ahead of entering initializing, we should only be here if 3806 // the super class became erroneous due to initialization. 3807 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3808 << "Super class initialization failed for " 3809 << PrettyDescriptor(handle_scope_super.Get()) 3810 << " that has unexpected status " << handle_scope_super->GetStatus() 3811 << "\nPending exception:\n" 3812 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3813 ObjectLock<mirror::Class> lock(self, klass); 3814 // Initialization failed because the super-class is erroneous. 3815 klass->SetStatus(mirror::Class::kStatusError, self); 3816 return false; 3817 } 3818 } 3819 } 3820 3821 if (klass->NumStaticFields() > 0) { 3822 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3823 CHECK(dex_class_def != NULL); 3824 const DexFile& dex_file = klass->GetDexFile(); 3825 StackHandleScope<2> hs(self); 3826 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3827 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3828 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3829 this, *dex_class_def); 3830 if (it.HasNext()) { 3831 CHECK(can_init_statics); 3832 // We reordered the fields, so we need to be able to map the 3833 // field indexes to the right fields. 3834 SafeMap<uint32_t, mirror::ArtField*> field_map; 3835 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3836 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3837 if (Runtime::Current()->IsActiveTransaction()) { 3838 it.ReadValueToField<true>(field_map.Get(i)); 3839 } else { 3840 it.ReadValueToField<false>(field_map.Get(i)); 3841 } 3842 } 3843 } 3844 } 3845 3846 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3847 if (clinit != NULL) { 3848 CHECK(can_init_statics); 3849 JValue result; 3850 clinit->Invoke(self, NULL, 0, &result, "V"); 3851 } 3852 3853 uint64_t t1 = NanoTime(); 3854 3855 bool success = true; 3856 { 3857 ObjectLock<mirror::Class> lock(self, klass); 3858 3859 if (self->IsExceptionPending()) { 3860 WrapExceptionInInitializer(); 3861 klass->SetStatus(mirror::Class::kStatusError, self); 3862 success = false; 3863 } else { 3864 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3865 RuntimeStats* thread_stats = self->GetStats(); 3866 ++global_stats->class_init_count; 3867 ++thread_stats->class_init_count; 3868 global_stats->class_init_time_ns += (t1 - t0); 3869 thread_stats->class_init_time_ns += (t1 - t0); 3870 // Set the class as initialized except if failed to initialize static fields. 3871 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3872 if (VLOG_IS_ON(class_linker)) { 3873 std::string temp; 3874 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 3875 klass->GetLocation(); 3876 } 3877 // Opportunistically set static method trampolines to their destination. 3878 FixupStaticTrampolines(klass.Get()); 3879 } 3880 } 3881 return success; 3882} 3883 3884bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3885 ObjectLock<mirror::Class>& lock) 3886 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3887 while (true) { 3888 self->AssertNoPendingException(); 3889 CHECK(!klass->IsInitialized()); 3890 lock.WaitIgnoringInterrupts(); 3891 3892 // When we wake up, repeat the test for init-in-progress. If 3893 // there's an exception pending (only possible if 3894 // "interruptShouldThrow" was set), bail out. 3895 if (self->IsExceptionPending()) { 3896 WrapExceptionInInitializer(); 3897 klass->SetStatus(mirror::Class::kStatusError, self); 3898 return false; 3899 } 3900 // Spurious wakeup? Go back to waiting. 3901 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3902 continue; 3903 } 3904 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3905 // Compile time initialization failed. 3906 return false; 3907 } 3908 if (klass->IsErroneous()) { 3909 // The caller wants an exception, but it was thrown in a 3910 // different thread. Synthesize one here. 3911 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3912 PrettyDescriptor(klass.Get()).c_str()); 3913 return false; 3914 } 3915 if (klass->IsInitialized()) { 3916 return true; 3917 } 3918 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 3919 << klass->GetStatus(); 3920 } 3921 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 3922} 3923 3924bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 3925 if (klass->IsInterface()) { 3926 return true; 3927 } 3928 // Begin with the methods local to the superclass. 3929 StackHandleScope<2> hs(Thread::Current()); 3930 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3931 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3932 if (klass->HasSuperClass() && 3933 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3934 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 3935 mh.ChangeMethod(klass->GetVTableEntry(i)); 3936 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 3937 if (mh.GetMethod() != super_mh.GetMethod() && 3938 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3939 ThrowLinkageError(klass.Get(), 3940 "Class %s method %s resolves differently in superclass %s", 3941 PrettyDescriptor(klass.Get()).c_str(), 3942 PrettyMethod(mh.GetMethod()).c_str(), 3943 PrettyDescriptor(klass->GetSuperClass()).c_str()); 3944 return false; 3945 } 3946 } 3947 } 3948 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3949 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 3950 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 3951 for (uint32_t j = 0; j < num_methods; ++j) { 3952 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 3953 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 3954 if (mh.GetMethod() != super_mh.GetMethod() && 3955 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3956 ThrowLinkageError(klass.Get(), 3957 "Class %s method %s resolves differently in interface %s", 3958 PrettyDescriptor(klass.Get()).c_str(), 3959 PrettyMethod(mh.GetMethod()).c_str(), 3960 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 3961 return false; 3962 } 3963 } 3964 } 3965 } 3966 return true; 3967} 3968 3969bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 3970 bool can_init_parents) { 3971 DCHECK(c.Get() != nullptr); 3972 const bool success = c->IsInitialized() || InitializeClass(c, can_init_fields, can_init_parents); 3973 if (!success && can_init_fields && can_init_parents) { 3974 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.Get()); 3975 } 3976 return success; 3977} 3978 3979void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3980 mirror::Class* c, 3981 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3982 const byte* class_data = dex_file.GetClassData(dex_class_def); 3983 ClassDataItemIterator it(dex_file, class_data); 3984 StackHandleScope<2> hs(Thread::Current()); 3985 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 3986 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 3987 CHECK(!kMovingFields); 3988 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3989 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3990 } 3991} 3992 3993void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 3994 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 3995 if (fields != nullptr) { 3996 for (int index = 0; index < fields->GetLength(); index ++) { 3997 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 3998 fields->Get(index)->SetDeclaringClass(new_class); 3999 } 4000 } 4001 } 4002 4003 fields = new_class->GetSFields(); 4004 if (fields != nullptr) { 4005 for (int index = 0; index < fields->GetLength(); index ++) { 4006 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4007 fields->Get(index)->SetDeclaringClass(new_class); 4008 } 4009 } 4010 } 4011 4012 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4013 if (methods != nullptr) { 4014 for (int index = 0; index < methods->GetLength(); index ++) { 4015 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4016 methods->Get(index)->SetDeclaringClass(new_class); 4017 } 4018 } 4019 } 4020 4021 methods = new_class->GetVirtualMethods(); 4022 if (methods != nullptr) { 4023 for (int index = 0; index < methods->GetLength(); index ++) { 4024 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4025 methods->Get(index)->SetDeclaringClass(new_class); 4026 } 4027 } 4028 } 4029} 4030 4031bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4032 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4033 mirror::Class** new_class) { 4034 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4035 4036 if (!LinkSuperClass(klass)) { 4037 return false; 4038 } 4039 if (!LinkMethods(self, klass, interfaces)) { 4040 return false; 4041 } 4042 if (!LinkInstanceFields(klass)) { 4043 return false; 4044 } 4045 size_t class_size; 4046 if (!LinkStaticFields(klass, &class_size)) { 4047 return false; 4048 } 4049 CreateReferenceInstanceOffsets(klass); 4050 CreateReferenceStaticOffsets(klass); 4051 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4052 4053 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4054 // We don't need to retire this class as it has no embedded tables or it was created the 4055 // correct size during class linker initialization. 4056 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4057 4058 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4059 klass->PopulateEmbeddedImtAndVTable(); 4060 } 4061 4062 // This will notify waiters on klass that saw the not yet resolved 4063 // class in the class_table_ during EnsureResolved. 4064 klass->SetStatus(mirror::Class::kStatusResolved, self); 4065 *new_class = klass.Get(); 4066 } else { 4067 CHECK(!klass->IsResolved()); 4068 // Retire the temporary class and create the correctly sized resolved class. 4069 *new_class = klass->CopyOf(self, class_size); 4070 if (UNLIKELY(*new_class == NULL)) { 4071 CHECK(self->IsExceptionPending()); // Expect an OOME. 4072 klass->SetStatus(mirror::Class::kStatusError, self); 4073 return false; 4074 } 4075 4076 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4077 StackHandleScope<1> hs(self); 4078 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4079 ObjectLock<mirror::Class> lock(self, new_class_h); 4080 4081 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4082 4083 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4084 CHECK(existing == NULL || existing == klass.Get()); 4085 4086 // This will notify waiters on temp class that saw the not yet resolved class in the 4087 // class_table_ during EnsureResolved. 4088 klass->SetStatus(mirror::Class::kStatusRetired, self); 4089 4090 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4091 // This will notify waiters on new_class that saw the not yet resolved 4092 // class in the class_table_ during EnsureResolved. 4093 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4094 } 4095 return true; 4096} 4097 4098bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4099 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4100 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4101 uint16_t super_class_idx = class_def.superclass_idx_; 4102 if (super_class_idx != DexFile::kDexNoIndex16) { 4103 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4104 if (super_class == NULL) { 4105 DCHECK(Thread::Current()->IsExceptionPending()); 4106 return false; 4107 } 4108 // Verify 4109 if (!klass->CanAccess(super_class)) { 4110 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4111 PrettyDescriptor(super_class).c_str(), 4112 PrettyDescriptor(klass.Get()).c_str()); 4113 return false; 4114 } 4115 CHECK(super_class->IsResolved()); 4116 klass->SetSuperClass(super_class); 4117 } 4118 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4119 if (interfaces != NULL) { 4120 for (size_t i = 0; i < interfaces->Size(); i++) { 4121 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4122 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4123 if (interface == NULL) { 4124 DCHECK(Thread::Current()->IsExceptionPending()); 4125 return false; 4126 } 4127 // Verify 4128 if (!klass->CanAccess(interface)) { 4129 // TODO: the RI seemed to ignore this in my testing. 4130 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4131 PrettyDescriptor(interface).c_str(), 4132 PrettyDescriptor(klass.Get()).c_str()); 4133 return false; 4134 } 4135 } 4136 } 4137 // Mark the class as loaded. 4138 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 4139 return true; 4140} 4141 4142bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4143 CHECK(!klass->IsPrimitive()); 4144 mirror::Class* super = klass->GetSuperClass(); 4145 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4146 if (super != NULL) { 4147 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4148 return false; 4149 } 4150 return true; 4151 } 4152 if (super == NULL) { 4153 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4154 PrettyDescriptor(klass.Get()).c_str()); 4155 return false; 4156 } 4157 // Verify 4158 if (super->IsFinal() || super->IsInterface()) { 4159 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4160 PrettyDescriptor(super).c_str(), 4161 PrettyDescriptor(klass.Get()).c_str(), 4162 super->IsFinal() ? "declared final" : "an interface"); 4163 return false; 4164 } 4165 if (!klass->CanAccess(super)) { 4166 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4167 PrettyDescriptor(super).c_str(), 4168 PrettyDescriptor(klass.Get()).c_str()); 4169 return false; 4170 } 4171 4172 // Inherit kAccClassIsFinalizable from the superclass in case this 4173 // class doesn't override finalize. 4174 if (super->IsFinalizable()) { 4175 klass->SetFinalizable(); 4176 } 4177 4178 // Inherit reference flags (if any) from the superclass. 4179 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4180 if (reference_flags != 0) { 4181 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4182 } 4183 // Disallow custom direct subclasses of java.lang.ref.Reference. 4184 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4185 ThrowLinkageError(klass.Get(), 4186 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4187 PrettyDescriptor(klass.Get()).c_str()); 4188 return false; 4189 } 4190 4191 if (kIsDebugBuild) { 4192 // Ensure super classes are fully resolved prior to resolving fields.. 4193 while (super != NULL) { 4194 CHECK(super->IsResolved()); 4195 super = super->GetSuperClass(); 4196 } 4197 } 4198 return true; 4199} 4200 4201// Populate the class vtable and itable. Compute return type indices. 4202bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4203 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4204 if (klass->IsInterface()) { 4205 // No vtable. 4206 size_t count = klass->NumVirtualMethods(); 4207 if (!IsUint(16, count)) { 4208 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4209 return false; 4210 } 4211 for (size_t i = 0; i < count; ++i) { 4212 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4213 } 4214 // Link interface method tables 4215 return LinkInterfaceMethods(klass, interfaces); 4216 } else { 4217 // Link virtual and interface method tables 4218 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4219 } 4220 return true; 4221} 4222 4223bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4224 if (klass->HasSuperClass()) { 4225 uint32_t max_count = klass->NumVirtualMethods() + 4226 klass->GetSuperClass()->GetVTableLength(); 4227 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4228 CHECK_LE(actual_count, max_count); 4229 StackHandleScope<4> hs(self); 4230 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4231 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4232 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4233 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4234 if (UNLIKELY(vtable.Get() == nullptr)) { 4235 CHECK(self->IsExceptionPending()); // OOME. 4236 return false; 4237 } 4238 int len = super_class->GetVTableLength(); 4239 for (int i = 0; i < len; i++) { 4240 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4241 } 4242 } else { 4243 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4244 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4245 if (UNLIKELY(vtable.Get() == nullptr)) { 4246 CHECK(self->IsExceptionPending()); // OOME. 4247 return false; 4248 } 4249 } 4250 4251 // See if any of our virtual methods override the superclass. 4252 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4253 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4254 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4255 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4256 local_mh.ChangeMethod(local_method); 4257 size_t j = 0; 4258 for (; j < actual_count; ++j) { 4259 mirror::ArtMethod* super_method = vtable->Get(j); 4260 super_mh.ChangeMethod(super_method); 4261 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4262 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4263 super_method->GetAccessFlags())) { 4264 if (super_method->IsFinal()) { 4265 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4266 PrettyMethod(local_method).c_str(), 4267 super_method->GetDeclaringClassDescriptor()); 4268 return false; 4269 } 4270 vtable->Set<false>(j, local_method); 4271 local_method->SetMethodIndex(j); 4272 break; 4273 } else { 4274 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4275 << " would have incorrectly overridden the package-private method in " 4276 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4277 } 4278 } 4279 } 4280 if (j == actual_count) { 4281 // Not overriding, append. 4282 vtable->Set<false>(actual_count, local_method); 4283 local_method->SetMethodIndex(actual_count); 4284 actual_count += 1; 4285 } 4286 } 4287 if (!IsUint(16, actual_count)) { 4288 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4289 return false; 4290 } 4291 // Shrink vtable if possible 4292 CHECK_LE(actual_count, max_count); 4293 if (actual_count < max_count) { 4294 vtable.Assign(vtable->CopyOf(self, actual_count)); 4295 if (UNLIKELY(vtable.Get() == NULL)) { 4296 CHECK(self->IsExceptionPending()); // OOME. 4297 return false; 4298 } 4299 } 4300 klass->SetVTable(vtable.Get()); 4301 } else { 4302 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4303 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4304 if (!IsUint(16, num_virtual_methods)) { 4305 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4306 return false; 4307 } 4308 StackHandleScope<1> hs(self); 4309 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4310 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4311 if (UNLIKELY(vtable.Get() == NULL)) { 4312 CHECK(self->IsExceptionPending()); // OOME. 4313 return false; 4314 } 4315 for (size_t i = 0; i < num_virtual_methods; ++i) { 4316 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4317 vtable->Set<false>(i, virtual_method); 4318 virtual_method->SetMethodIndex(i & 0xFFFF); 4319 } 4320 klass->SetVTable(vtable.Get()); 4321 } 4322 return true; 4323} 4324 4325bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 4326 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4327 Thread* const self = Thread::Current(); 4328 Runtime* const runtime = Runtime::Current(); 4329 // Set the imt table to be all conflicts by default. 4330 klass->SetImTable(runtime->GetDefaultImt()); 4331 size_t super_ifcount; 4332 if (klass->HasSuperClass()) { 4333 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4334 } else { 4335 super_ifcount = 0; 4336 } 4337 uint32_t num_interfaces = 4338 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4339 size_t ifcount = super_ifcount + num_interfaces; 4340 for (size_t i = 0; i < num_interfaces; i++) { 4341 mirror::Class* interface = 4342 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4343 interfaces->Get(i); 4344 ifcount += interface->GetIfTableCount(); 4345 } 4346 if (ifcount == 0) { 4347 // Class implements no interfaces. 4348 DCHECK_EQ(klass->GetIfTableCount(), 0); 4349 DCHECK(klass->GetIfTable() == NULL); 4350 return true; 4351 } 4352 if (ifcount == super_ifcount) { 4353 // Class implements same interfaces as parent, are any of these not marker interfaces? 4354 bool has_non_marker_interface = false; 4355 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4356 for (size_t i = 0; i < ifcount; ++i) { 4357 if (super_iftable->GetMethodArrayCount(i) > 0) { 4358 has_non_marker_interface = true; 4359 break; 4360 } 4361 } 4362 if (!has_non_marker_interface) { 4363 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4364 klass->SetIfTable(super_iftable); 4365 return true; 4366 } 4367 } 4368 StackHandleScope<4> hs(self); 4369 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4370 if (UNLIKELY(iftable.Get() == NULL)) { 4371 CHECK(self->IsExceptionPending()); // OOME. 4372 return false; 4373 } 4374 if (super_ifcount != 0) { 4375 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4376 for (size_t i = 0; i < super_ifcount; i++) { 4377 mirror::Class* super_interface = super_iftable->GetInterface(i); 4378 iftable->SetInterface(i, super_interface); 4379 } 4380 } 4381 // Flatten the interface inheritance hierarchy. 4382 size_t idx = super_ifcount; 4383 for (size_t i = 0; i < num_interfaces; i++) { 4384 mirror::Class* interface = 4385 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4386 interfaces->Get(i); 4387 DCHECK(interface != NULL); 4388 if (!interface->IsInterface()) { 4389 std::string temp; 4390 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4391 PrettyDescriptor(klass.Get()).c_str(), 4392 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4393 return false; 4394 } 4395 // Check if interface is already in iftable 4396 bool duplicate = false; 4397 for (size_t j = 0; j < idx; j++) { 4398 mirror::Class* existing_interface = iftable->GetInterface(j); 4399 if (existing_interface == interface) { 4400 duplicate = true; 4401 break; 4402 } 4403 } 4404 if (!duplicate) { 4405 // Add this non-duplicate interface. 4406 iftable->SetInterface(idx++, interface); 4407 // Add this interface's non-duplicate super-interfaces. 4408 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4409 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4410 bool super_duplicate = false; 4411 for (size_t k = 0; k < idx; k++) { 4412 mirror::Class* existing_interface = iftable->GetInterface(k); 4413 if (existing_interface == super_interface) { 4414 super_duplicate = true; 4415 break; 4416 } 4417 } 4418 if (!super_duplicate) { 4419 iftable->SetInterface(idx++, super_interface); 4420 } 4421 } 4422 } 4423 } 4424 // Shrink iftable in case duplicates were found 4425 if (idx < ifcount) { 4426 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4427 if (UNLIKELY(iftable.Get() == NULL)) { 4428 CHECK(self->IsExceptionPending()); // OOME. 4429 return false; 4430 } 4431 ifcount = idx; 4432 } else { 4433 CHECK_EQ(idx, ifcount); 4434 } 4435 klass->SetIfTable(iftable.Get()); 4436 4437 // If we're an interface, we don't need the vtable pointers, so we're done. 4438 if (klass->IsInterface()) { 4439 return true; 4440 } 4441 // Allocate imtable 4442 bool imtable_changed = false; 4443 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4444 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4445 if (UNLIKELY(imtable.Get() == NULL)) { 4446 CHECK(self->IsExceptionPending()); // OOME. 4447 return false; 4448 } 4449 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4450 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4451 std::vector<mirror::ArtMethod*> miranda_list; 4452 for (size_t i = 0; i < ifcount; ++i) { 4453 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4454 if (num_methods > 0) { 4455 StackHandleScope<2> hs(self); 4456 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4457 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4458 if (UNLIKELY(method_array.Get() == nullptr)) { 4459 CHECK(self->IsExceptionPending()); // OOME. 4460 return false; 4461 } 4462 iftable->SetMethodArray(i, method_array.Get()); 4463 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4464 hs.NewHandle(klass->GetVTableDuringLinking())); 4465 for (size_t j = 0; j < num_methods; ++j) { 4466 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 4467 interface_mh.ChangeMethod(interface_method); 4468 int32_t k; 4469 // For each method listed in the interface's method list, find the 4470 // matching method in our class's method list. We want to favor the 4471 // subclass over the superclass, which just requires walking 4472 // back from the end of the vtable. (This only matters if the 4473 // superclass defines a private method and this class redefines 4474 // it -- otherwise it would use the same vtable slot. In .dex files 4475 // those don't end up in the virtual method table, so it shouldn't 4476 // matter which direction we go. We walk it backward anyway.) 4477 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4478 mirror::ArtMethod* vtable_method = vtable->Get(k); 4479 vtable_mh.ChangeMethod(vtable_method); 4480 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4481 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 4482 ThrowIllegalAccessError( 4483 klass.Get(), 4484 "Method '%s' implementing interface method '%s' is not public", 4485 PrettyMethod(vtable_method).c_str(), 4486 PrettyMethod(interface_method).c_str()); 4487 return false; 4488 } 4489 method_array->Set<false>(j, vtable_method); 4490 // Place method in imt if entry is empty, place conflict otherwise. 4491 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4492 if (imtable->Get(imt_index) == NULL) { 4493 imtable->Set<false>(imt_index, vtable_method); 4494 imtable_changed = true; 4495 } else { 4496 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4497 } 4498 break; 4499 } 4500 } 4501 if (k < 0) { 4502 StackHandleScope<1> hs(self); 4503 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4504 for (mirror::ArtMethod* mir_method : miranda_list) { 4505 vtable_mh.ChangeMethod(mir_method); 4506 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4507 miranda_method.Assign(mir_method); 4508 break; 4509 } 4510 } 4511 if (miranda_method.Get() == NULL) { 4512 // Point the interface table at a phantom slot. 4513 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 4514 if (UNLIKELY(miranda_method.Get() == NULL)) { 4515 CHECK(self->IsExceptionPending()); // OOME. 4516 return false; 4517 } 4518 // TODO: If a methods move then the miranda_list may hold stale references. 4519 miranda_list.push_back(miranda_method.Get()); 4520 } 4521 method_array->Set<false>(j, miranda_method.Get()); 4522 } 4523 } 4524 } 4525 } 4526 if (imtable_changed) { 4527 // Fill in empty entries in interface method table with conflict. 4528 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4529 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4530 if (imtable->Get(i) == NULL) { 4531 imtable->Set<false>(i, imt_conflict_method); 4532 } 4533 } 4534 klass->SetImTable(imtable.Get()); 4535 } 4536 if (!miranda_list.empty()) { 4537 int old_method_count = klass->NumVirtualMethods(); 4538 int new_method_count = old_method_count + miranda_list.size(); 4539 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4540 if (old_method_count == 0) { 4541 virtuals = AllocArtMethodArray(self, new_method_count); 4542 } else { 4543 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4544 } 4545 if (UNLIKELY(virtuals == NULL)) { 4546 CHECK(self->IsExceptionPending()); // OOME. 4547 return false; 4548 } 4549 klass->SetVirtualMethods(virtuals); 4550 4551 StackHandleScope<1> hs(self); 4552 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4553 hs.NewHandle(klass->GetVTableDuringLinking())); 4554 CHECK(vtable.Get() != NULL); 4555 int old_vtable_count = vtable->GetLength(); 4556 int new_vtable_count = old_vtable_count + miranda_list.size(); 4557 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4558 if (UNLIKELY(vtable.Get() == NULL)) { 4559 CHECK(self->IsExceptionPending()); // OOME. 4560 return false; 4561 } 4562 for (size_t i = 0; i < miranda_list.size(); ++i) { 4563 mirror::ArtMethod* method = miranda_list[i]; 4564 // Leave the declaring class alone as type indices are relative to it 4565 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4566 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4567 klass->SetVirtualMethod(old_method_count + i, method); 4568 vtable->Set<false>(old_vtable_count + i, method); 4569 } 4570 // TODO: do not assign to the vtable field until it is fully constructed. 4571 klass->SetVTable(vtable.Get()); 4572 } 4573 4574 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4575 for (int i = 0; i < vtable->GetLength(); ++i) { 4576 CHECK(vtable->Get(i) != NULL); 4577 } 4578 4579// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4580 4581 return true; 4582} 4583 4584bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4585 CHECK(klass.Get() != NULL); 4586 return LinkFields(klass, false, nullptr); 4587} 4588 4589bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass, size_t* class_size) { 4590 CHECK(klass.Get() != NULL); 4591 return LinkFields(klass, true, class_size); 4592} 4593 4594struct LinkFieldsComparator { 4595 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4596 } 4597 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4598 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4599 NO_THREAD_SAFETY_ANALYSIS { 4600 // First come reference fields, then 64-bit, and finally 32-bit 4601 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4602 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4603 if (type1 != type2) { 4604 bool is_primitive1 = type1 != Primitive::kPrimNot; 4605 bool is_primitive2 = type2 != Primitive::kPrimNot; 4606 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4607 type1 == Primitive::kPrimDouble); 4608 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4609 type2 == Primitive::kPrimDouble); 4610 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4611 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4612 if (order1 != order2) { 4613 return order1 < order2; 4614 } 4615 } 4616 // same basic group? then sort by string. 4617 return strcmp(field1->GetName(), field2->GetName()) < 0; 4618 } 4619}; 4620 4621bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static, size_t* class_size) { 4622 size_t num_fields = 4623 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4624 4625 mirror::ObjectArray<mirror::ArtField>* fields = 4626 is_static ? klass->GetSFields() : klass->GetIFields(); 4627 4628 // Initialize field_offset 4629 MemberOffset field_offset(0); 4630 if (is_static) { 4631 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 4632 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4633 // Static fields come after the embedded tables. 4634 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 4635 0, 0, 0); 4636 } 4637 field_offset = MemberOffset(base); 4638 } else { 4639 mirror::Class* super_class = klass->GetSuperClass(); 4640 if (super_class != NULL) { 4641 CHECK(super_class->IsResolved()) 4642 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4643 field_offset = MemberOffset(super_class->GetObjectSize()); 4644 } 4645 } 4646 4647 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4648 4649 // we want a relatively stable order so that adding new fields 4650 // minimizes disruption of C++ version such as Class and Method. 4651 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4652 for (size_t i = 0; i < num_fields; i++) { 4653 mirror::ArtField* f = fields->Get(i); 4654 CHECK(f != NULL) << PrettyClass(klass.Get()); 4655 grouped_and_sorted_fields.push_back(f); 4656 } 4657 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4658 LinkFieldsComparator()); 4659 4660 // References should be at the front. 4661 size_t current_field = 0; 4662 size_t num_reference_fields = 0; 4663 for (; current_field < num_fields; current_field++) { 4664 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4665 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4666 bool isPrimitive = type != Primitive::kPrimNot; 4667 if (isPrimitive) { 4668 break; // past last reference, move on to the next phase 4669 } 4670 grouped_and_sorted_fields.pop_front(); 4671 num_reference_fields++; 4672 fields->Set<false>(current_field, field); 4673 field->SetOffset(field_offset); 4674 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4675 } 4676 4677 // Now we want to pack all of the double-wide fields together. If 4678 // we're not aligned, though, we want to shuffle one 32-bit field 4679 // into place. If we can't find one, we'll have to pad it. 4680 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4681 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4682 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4683 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4684 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4685 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4686 continue; 4687 } 4688 fields->Set<false>(current_field++, field); 4689 field->SetOffset(field_offset); 4690 // drop the consumed field 4691 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4692 break; 4693 } 4694 // whether we found a 32-bit field for padding or not, we advance 4695 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4696 } 4697 4698 // Alignment is good, shuffle any double-wide fields forward, and 4699 // finish assigning field offsets to all fields. 4700 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 4701 << PrettyClass(klass.Get()); 4702 while (!grouped_and_sorted_fields.empty()) { 4703 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4704 grouped_and_sorted_fields.pop_front(); 4705 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4706 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4707 fields->Set<false>(current_field, field); 4708 field->SetOffset(field_offset); 4709 field_offset = MemberOffset(field_offset.Uint32Value() + 4710 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4711 ? sizeof(uint64_t) 4712 : sizeof(uint32_t))); 4713 current_field++; 4714 } 4715 4716 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4717 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4718 // We know there are no non-reference fields in the Reference classes, and we know 4719 // that 'referent' is alphabetically last, so this is easy... 4720 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4721 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4722 --num_reference_fields; 4723 } 4724 4725 if (kIsDebugBuild) { 4726 // Make sure that all reference fields appear before 4727 // non-reference fields, and all double-wide fields are aligned. 4728 bool seen_non_ref = false; 4729 for (size_t i = 0; i < num_fields; i++) { 4730 mirror::ArtField* field = fields->Get(i); 4731 if (false) { // enable to debug field layout 4732 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4733 << " class=" << PrettyClass(klass.Get()) 4734 << " field=" << PrettyField(field) 4735 << " offset=" 4736 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4737 } 4738 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4739 bool is_primitive = type != Primitive::kPrimNot; 4740 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4741 strcmp("referent", field->GetName()) == 0) { 4742 is_primitive = true; // We lied above, so we have to expect a lie here. 4743 } 4744 if (is_primitive) { 4745 if (!seen_non_ref) { 4746 seen_non_ref = true; 4747 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4748 } 4749 } else { 4750 DCHECK(!seen_non_ref) << PrettyField(field); 4751 } 4752 } 4753 if (!seen_non_ref) { 4754 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4755 } 4756 } 4757 4758 size_t size = field_offset.Uint32Value(); 4759 // Update klass 4760 if (is_static) { 4761 klass->SetNumReferenceStaticFields(num_reference_fields); 4762 *class_size = size; 4763 } else { 4764 klass->SetNumReferenceInstanceFields(num_reference_fields); 4765 if (!klass->IsVariableSize()) { 4766 std::string temp; 4767 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 4768 size_t previous_size = klass->GetObjectSize(); 4769 if (previous_size != 0) { 4770 // Make sure that we didn't originally have an incorrect size. 4771 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 4772 } 4773 klass->SetObjectSize(size); 4774 } 4775 } 4776 return true; 4777} 4778 4779// Set the bitmap of reference offsets, refOffsets, from the ifields 4780// list. 4781void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4782 uint32_t reference_offsets = 0; 4783 mirror::Class* super_class = klass->GetSuperClass(); 4784 if (super_class != NULL) { 4785 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4786 // If our superclass overflowed, we don't stand a chance. 4787 if (reference_offsets == CLASS_WALK_SUPER) { 4788 klass->SetReferenceInstanceOffsets(reference_offsets); 4789 return; 4790 } 4791 } 4792 CreateReferenceOffsets(klass, false, reference_offsets); 4793} 4794 4795void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4796 CreateReferenceOffsets(klass, true, 0); 4797} 4798 4799void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4800 uint32_t reference_offsets) { 4801 size_t num_reference_fields = 4802 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4803 : klass->NumReferenceInstanceFieldsDuringLinking(); 4804 mirror::ObjectArray<mirror::ArtField>* fields = 4805 is_static ? klass->GetSFields() : klass->GetIFields(); 4806 // All of the fields that contain object references are guaranteed 4807 // to be at the beginning of the fields list. 4808 for (size_t i = 0; i < num_reference_fields; ++i) { 4809 // Note that byte_offset is the offset from the beginning of 4810 // object, not the offset into instance data 4811 mirror::ArtField* field = fields->Get(i); 4812 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4813 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4814 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4815 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4816 CHECK_NE(new_bit, 0U); 4817 reference_offsets |= new_bit; 4818 } else { 4819 reference_offsets = CLASS_WALK_SUPER; 4820 break; 4821 } 4822 } 4823 // Update fields in klass 4824 if (is_static) { 4825 klass->SetReferenceStaticOffsets(reference_offsets); 4826 } else { 4827 klass->SetReferenceInstanceOffsets(reference_offsets); 4828 } 4829} 4830 4831mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4832 Handle<mirror::DexCache> dex_cache) { 4833 DCHECK(dex_cache.Get() != nullptr); 4834 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4835 if (resolved != NULL) { 4836 return resolved; 4837 } 4838 uint32_t utf16_length; 4839 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4840 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4841 dex_cache->SetResolvedString(string_idx, string); 4842 return string; 4843} 4844 4845mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4846 mirror::Class* referrer) { 4847 StackHandleScope<2> hs(Thread::Current()); 4848 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4849 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4850 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4851} 4852 4853mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4854 Handle<mirror::DexCache> dex_cache, 4855 Handle<mirror::ClassLoader> class_loader) { 4856 DCHECK(dex_cache.Get() != NULL); 4857 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4858 if (resolved == NULL) { 4859 Thread* self = Thread::Current(); 4860 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4861 resolved = FindClass(self, descriptor, class_loader); 4862 if (resolved != NULL) { 4863 // TODO: we used to throw here if resolved's class loader was not the 4864 // boot class loader. This was to permit different classes with the 4865 // same name to be loaded simultaneously by different loaders 4866 dex_cache->SetResolvedType(type_idx, resolved); 4867 } else { 4868 CHECK(self->IsExceptionPending()) 4869 << "Expected pending exception for failed resolution of: " << descriptor; 4870 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4871 StackHandleScope<1> hs(self); 4872 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4873 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4874 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4875 self->ClearException(); 4876 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4877 self->GetException(NULL)->SetCause(cause.Get()); 4878 } 4879 } 4880 } 4881 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4882 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4883 return resolved; 4884} 4885 4886mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 4887 Handle<mirror::DexCache> dex_cache, 4888 Handle<mirror::ClassLoader> class_loader, 4889 Handle<mirror::ArtMethod> referrer, 4890 InvokeType type) { 4891 DCHECK(dex_cache.Get() != nullptr); 4892 // Check for hit in the dex cache. 4893 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4894 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 4895 return resolved; 4896 } 4897 // Fail, get the declaring class. 4898 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4899 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4900 if (klass == nullptr) { 4901 DCHECK(Thread::Current()->IsExceptionPending()); 4902 return nullptr; 4903 } 4904 // Scan using method_idx, this saves string compares but will only hit for matching dex 4905 // caches/files. 4906 switch (type) { 4907 case kDirect: // Fall-through. 4908 case kStatic: 4909 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 4910 break; 4911 case kInterface: 4912 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 4913 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 4914 break; 4915 case kSuper: // Fall-through. 4916 case kVirtual: 4917 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 4918 break; 4919 default: 4920 LOG(FATAL) << "Unreachable - invocation type: " << type; 4921 } 4922 if (resolved == nullptr) { 4923 // Search by name, which works across dex files. 4924 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4925 const Signature signature = dex_file.GetMethodSignature(method_id); 4926 switch (type) { 4927 case kDirect: // Fall-through. 4928 case kStatic: 4929 resolved = klass->FindDirectMethod(name, signature); 4930 break; 4931 case kInterface: 4932 resolved = klass->FindInterfaceMethod(name, signature); 4933 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 4934 break; 4935 case kSuper: // Fall-through. 4936 case kVirtual: 4937 resolved = klass->FindVirtualMethod(name, signature); 4938 break; 4939 } 4940 } 4941 // If we found a method, check for incompatible class changes. 4942 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 4943 // Be a good citizen and update the dex cache to speed subsequent calls. 4944 dex_cache->SetResolvedMethod(method_idx, resolved); 4945 return resolved; 4946 } else { 4947 // If we had a method, it's an incompatible-class-change error. 4948 if (resolved != nullptr) { 4949 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 4950 } else { 4951 // We failed to find the method which means either an access error, an incompatible class 4952 // change, or no such method. First try to find the method among direct and virtual methods. 4953 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4954 const Signature signature = dex_file.GetMethodSignature(method_id); 4955 switch (type) { 4956 case kDirect: 4957 case kStatic: 4958 resolved = klass->FindVirtualMethod(name, signature); 4959 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 4960 // have had a resolved method before, which triggers the "true" branch above. 4961 break; 4962 case kInterface: 4963 case kVirtual: 4964 case kSuper: 4965 resolved = klass->FindDirectMethod(name, signature); 4966 break; 4967 } 4968 4969 // If we found something, check that it can be accessed by the referrer. 4970 if (resolved != nullptr && referrer.Get() != nullptr) { 4971 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4972 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4973 if (!referring_class->CanAccess(methods_class)) { 4974 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4975 resolved, type); 4976 return nullptr; 4977 } else if (!referring_class->CanAccessMember(methods_class, 4978 resolved->GetAccessFlags())) { 4979 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4980 return nullptr; 4981 } 4982 } 4983 4984 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4985 // methods and throw if we find the method there. If we find nothing, throw a 4986 // NoSuchMethodError. 4987 switch (type) { 4988 case kDirect: 4989 case kStatic: 4990 if (resolved != nullptr) { 4991 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4992 } else { 4993 resolved = klass->FindInterfaceMethod(name, signature); 4994 if (resolved != nullptr) { 4995 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4996 } else { 4997 ThrowNoSuchMethodError(type, klass, name, signature); 4998 } 4999 } 5000 break; 5001 case kInterface: 5002 if (resolved != nullptr) { 5003 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5004 } else { 5005 resolved = klass->FindVirtualMethod(name, signature); 5006 if (resolved != nullptr) { 5007 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5008 } else { 5009 ThrowNoSuchMethodError(type, klass, name, signature); 5010 } 5011 } 5012 break; 5013 case kSuper: 5014 ThrowNoSuchMethodError(type, klass, name, signature); 5015 break; 5016 case kVirtual: 5017 if (resolved != nullptr) { 5018 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5019 } else { 5020 resolved = klass->FindInterfaceMethod(name, signature); 5021 if (resolved != nullptr) { 5022 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5023 } else { 5024 ThrowNoSuchMethodError(type, klass, name, signature); 5025 } 5026 } 5027 break; 5028 } 5029 } 5030 DCHECK(Thread::Current()->IsExceptionPending()); 5031 return nullptr; 5032 } 5033} 5034 5035mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5036 Handle<mirror::DexCache> dex_cache, 5037 Handle<mirror::ClassLoader> class_loader, 5038 bool is_static) { 5039 DCHECK(dex_cache.Get() != nullptr); 5040 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5041 if (resolved != nullptr) { 5042 return resolved; 5043 } 5044 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5045 Thread* const self = Thread::Current(); 5046 StackHandleScope<1> hs(self); 5047 Handle<mirror::Class> klass( 5048 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5049 if (klass.Get() == nullptr) { 5050 DCHECK(Thread::Current()->IsExceptionPending()); 5051 return nullptr; 5052 } 5053 5054 if (is_static) { 5055 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5056 } else { 5057 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5058 } 5059 5060 if (resolved == nullptr) { 5061 const char* name = dex_file.GetFieldName(field_id); 5062 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5063 if (is_static) { 5064 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5065 } else { 5066 resolved = klass->FindInstanceField(name, type); 5067 } 5068 if (resolved == nullptr) { 5069 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5070 return NULL; 5071 } 5072 } 5073 dex_cache->SetResolvedField(field_idx, resolved); 5074 return resolved; 5075} 5076 5077mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5078 uint32_t field_idx, 5079 Handle<mirror::DexCache> dex_cache, 5080 Handle<mirror::ClassLoader> class_loader) { 5081 DCHECK(dex_cache.Get() != nullptr); 5082 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5083 if (resolved != nullptr) { 5084 return resolved; 5085 } 5086 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5087 Thread* self = Thread::Current(); 5088 StackHandleScope<1> hs(self); 5089 Handle<mirror::Class> klass( 5090 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5091 if (klass.Get() == NULL) { 5092 DCHECK(Thread::Current()->IsExceptionPending()); 5093 return NULL; 5094 } 5095 5096 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5097 StringPiece type(dex_file.StringDataByIdx( 5098 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5099 resolved = mirror::Class::FindField(self, klass, name, type); 5100 if (resolved != NULL) { 5101 dex_cache->SetResolvedField(field_idx, resolved); 5102 } else { 5103 ThrowNoSuchFieldError("", klass.Get(), type, name); 5104 } 5105 return resolved; 5106} 5107 5108const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5109 uint32_t* length) { 5110 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5111 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5112 const DexFile& dex_file = *dex_cache->GetDexFile(); 5113 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5114 return dex_file.GetMethodShorty(method_id, length); 5115} 5116 5117void ClassLinker::DumpAllClasses(int flags) { 5118 if (dex_cache_image_class_lookup_required_) { 5119 MoveImageClassesToClassTable(); 5120 } 5121 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5122 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5123 std::vector<mirror::Class*> all_classes; 5124 { 5125 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5126 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5127 mirror::Class* klass = it.second.Read(); 5128 all_classes.push_back(klass); 5129 } 5130 } 5131 5132 for (size_t i = 0; i < all_classes.size(); ++i) { 5133 all_classes[i]->DumpClass(std::cerr, flags); 5134 } 5135} 5136 5137void ClassLinker::DumpForSigQuit(std::ostream& os) { 5138 if (dex_cache_image_class_lookup_required_) { 5139 MoveImageClassesToClassTable(); 5140 } 5141 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5142 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5143} 5144 5145size_t ClassLinker::NumLoadedClasses() { 5146 if (dex_cache_image_class_lookup_required_) { 5147 MoveImageClassesToClassTable(); 5148 } 5149 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5150 return class_table_.size(); 5151} 5152 5153pid_t ClassLinker::GetClassesLockOwner() { 5154 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5155} 5156 5157pid_t ClassLinker::GetDexLockOwner() { 5158 return dex_lock_.GetExclusiveOwnerTid(); 5159} 5160 5161void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5162 DCHECK(!init_done_); 5163 5164 DCHECK(klass != NULL); 5165 DCHECK(klass->GetClassLoader() == NULL); 5166 5167 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5168 DCHECK(class_roots != NULL); 5169 DCHECK(class_roots->Get(class_root) == NULL); 5170 class_roots->Set<false>(class_root, klass); 5171} 5172 5173} // namespace art 5174