class_linker.cc revision d85614222fa062ec809af9d65f04ab6b7dc1c248
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <fcntl.h> 20#include <sys/file.h> 21#include <sys/stat.h> 22#include <deque> 23#include <memory> 24#include <string> 25#include <utility> 26#include <vector> 27 28#include "base/casts.h" 29#include "base/logging.h" 30#include "base/scoped_flock.h" 31#include "base/stl_util.h" 32#include "base/unix_file/fd_file.h" 33#include "class_linker-inl.h" 34#include "compiler_callbacks.h" 35#include "debugger.h" 36#include "dex_file-inl.h" 37#include "gc/accounting/card_table-inl.h" 38#include "gc/accounting/heap_bitmap.h" 39#include "gc/heap.h" 40#include "gc/space/image_space.h" 41#include "handle_scope.h" 42#include "intern_table.h" 43#include "interpreter/interpreter.h" 44#include "leb128.h" 45#include "oat.h" 46#include "oat_file.h" 47#include "mirror/art_field-inl.h" 48#include "mirror/art_method-inl.h" 49#include "mirror/class.h" 50#include "mirror/class-inl.h" 51#include "mirror/class_loader.h" 52#include "mirror/dex_cache-inl.h" 53#include "mirror/iftable-inl.h" 54#include "mirror/object-inl.h" 55#include "mirror/object_array-inl.h" 56#include "mirror/proxy.h" 57#include "mirror/reference-inl.h" 58#include "mirror/stack_trace_element.h" 59#include "mirror/string-inl.h" 60#include "object_utils.h" 61#include "os.h" 62#include "runtime.h" 63#include "entrypoints/entrypoint_utils.h" 64#include "ScopedLocalRef.h" 65#include "scoped_thread_state_change.h" 66#include "handle_scope-inl.h" 67#include "thread.h" 68#include "utils.h" 69#include "verifier/method_verifier.h" 70#include "well_known_classes.h" 71 72namespace art { 73 74static void ThrowNoClassDefFoundError(const char* fmt, ...) 75 __attribute__((__format__(__printf__, 1, 2))) 76 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 77static void ThrowNoClassDefFoundError(const char* fmt, ...) { 78 va_list args; 79 va_start(args, fmt); 80 Thread* self = Thread::Current(); 81 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 82 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 83 va_end(args); 84} 85 86static void ThrowEarlierClassFailure(mirror::Class* c) 87 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 88 // The class failed to initialize on a previous attempt, so we want to throw 89 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 90 // failed in verification, in which case v2 5.4.1 says we need to re-throw 91 // the previous error. 92 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 93 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 94 } 95 96 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 97 Thread* self = Thread::Current(); 98 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 99 if (c->GetVerifyErrorClass() != NULL) { 100 // TODO: change the verifier to store an _instance_, with a useful detail message? 101 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor().c_str(), 102 PrettyDescriptor(c).c_str()); 103 } else { 104 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 105 PrettyDescriptor(c).c_str()); 106 } 107} 108 109static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 110 Thread* self = Thread::Current(); 111 JNIEnv* env = self->GetJniEnv(); 112 113 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 114 CHECK(cause.get() != NULL); 115 116 env->ExceptionClear(); 117 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 118 env->Throw(cause.get()); 119 120 // We only wrap non-Error exceptions; an Error can just be used as-is. 121 if (!is_error) { 122 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 123 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 124 } 125} 126 127static size_t Hash(const char* s) { 128 // This is the java.lang.String hashcode for convenience, not interoperability. 129 size_t hash = 0; 130 for (; *s != '\0'; ++s) { 131 hash = hash * 31 + *s; 132 } 133 return hash; 134} 135 136const char* ClassLinker::class_roots_descriptors_[] = { 137 "Ljava/lang/Class;", 138 "Ljava/lang/Object;", 139 "[Ljava/lang/Class;", 140 "[Ljava/lang/Object;", 141 "Ljava/lang/String;", 142 "Ljava/lang/DexCache;", 143 "Ljava/lang/ref/Reference;", 144 "Ljava/lang/reflect/ArtField;", 145 "Ljava/lang/reflect/ArtMethod;", 146 "Ljava/lang/reflect/Proxy;", 147 "[Ljava/lang/String;", 148 "[Ljava/lang/reflect/ArtField;", 149 "[Ljava/lang/reflect/ArtMethod;", 150 "Ljava/lang/ClassLoader;", 151 "Ljava/lang/Throwable;", 152 "Ljava/lang/ClassNotFoundException;", 153 "Ljava/lang/StackTraceElement;", 154 "Z", 155 "B", 156 "C", 157 "D", 158 "F", 159 "I", 160 "J", 161 "S", 162 "V", 163 "[Z", 164 "[B", 165 "[C", 166 "[D", 167 "[F", 168 "[I", 169 "[J", 170 "[S", 171 "[Ljava/lang/StackTraceElement;", 172}; 173 174ClassLinker::ClassLinker(InternTable* intern_table) 175 // dex_lock_ is recursive as it may be used in stack dumping. 176 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 177 dex_cache_image_class_lookup_required_(false), 178 failed_dex_cache_class_lookups_(0), 179 class_roots_(nullptr), 180 array_iftable_(nullptr), 181 find_array_class_cache_next_victim_(0), 182 init_done_(false), 183 log_new_dex_caches_roots_(false), 184 log_new_class_table_roots_(false), 185 intern_table_(intern_table), 186 portable_resolution_trampoline_(nullptr), 187 quick_resolution_trampoline_(nullptr), 188 portable_imt_conflict_trampoline_(nullptr), 189 quick_imt_conflict_trampoline_(nullptr), 190 quick_generic_jni_trampoline_(nullptr), 191 quick_to_interpreter_bridge_trampoline_(nullptr) { 192 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 193 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 194} 195 196// To set a value for generic JNI. May be necessary in compiler tests. 197extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 198 199void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 200 VLOG(startup) << "ClassLinker::Init"; 201 CHECK(Runtime::Current()->IsCompiler()); 202 203 CHECK(!init_done_); 204 205 // java_lang_Class comes first, it's needed for AllocClass 206 Thread* self = Thread::Current(); 207 gc::Heap* heap = Runtime::Current()->GetHeap(); 208 // The GC can't handle an object with a null class since we can't get the size of this object. 209 heap->IncrementDisableMovingGC(self); 210 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 211 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 212 heap->AllocNonMovableObject<true>(self, nullptr, 213 mirror::Class::ClassClassSize(), 214 VoidFunctor())))); 215 CHECK(java_lang_Class.Get() != NULL); 216 mirror::Class::SetClassClass(java_lang_Class.Get()); 217 java_lang_Class->SetClass(java_lang_Class.Get()); 218 if (kUseBakerOrBrooksReadBarrier) { 219 java_lang_Class->AssertReadBarrierPointer(); 220 } 221 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 222 heap->DecrementDisableMovingGC(self); 223 // AllocClass(mirror::Class*) can now be used 224 225 // Class[] is used for reflection support. 226 Handle<mirror::Class> class_array_class(hs.NewHandle( 227 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 228 class_array_class->SetComponentType(java_lang_Class.Get()); 229 230 // java_lang_Object comes next so that object_array_class can be created. 231 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 232 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 233 CHECK(java_lang_Object.Get() != NULL); 234 // backfill Object as the super class of Class. 235 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 236 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 237 238 // Object[] next to hold class roots. 239 Handle<mirror::Class> object_array_class(hs.NewHandle( 240 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 241 object_array_class->SetComponentType(java_lang_Object.Get()); 242 243 // Setup the char (primitive) class to be used for char[]. 244 Handle<mirror::Class> char_class(hs.NewHandle( 245 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 246 247 // Setup the char[] class to be used for String. 248 Handle<mirror::Class> char_array_class(hs.NewHandle( 249 AllocClass(self, java_lang_Class.Get(), 250 mirror::Array::ClassSize()))); 251 char_array_class->SetComponentType(char_class.Get()); 252 mirror::CharArray::SetArrayClass(char_array_class.Get()); 253 254 // Setup String. 255 Handle<mirror::Class> java_lang_String(hs.NewHandle( 256 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 257 mirror::String::SetClass(java_lang_String.Get()); 258 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 259 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 260 261 // Setup Reference. 262 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 263 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 264 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 265 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 266 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 267 268 // Create storage for root classes, save away our work so far (requires descriptors). 269 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 270 kClassRootsMax); 271 CHECK(class_roots_ != NULL); 272 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 273 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 274 SetClassRoot(kClassArrayClass, class_array_class.Get()); 275 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 276 SetClassRoot(kCharArrayClass, char_array_class.Get()); 277 SetClassRoot(kJavaLangString, java_lang_String.Get()); 278 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 279 280 // Setup the primitive type classes. 281 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 282 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 283 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 284 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 285 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 286 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 287 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 288 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 289 290 // Create array interface entries to populate once we can load system classes. 291 array_iftable_ = AllocIfTable(self, 2); 292 293 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 294 Handle<mirror::Class> int_array_class(hs.NewHandle( 295 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 296 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 297 mirror::IntArray::SetArrayClass(int_array_class.Get()); 298 SetClassRoot(kIntArrayClass, int_array_class.Get()); 299 300 // now that these are registered, we can use AllocClass() and AllocObjectArray 301 302 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 303 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 304 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 305 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 306 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 307 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 308 309 // Constructor, Field, Method, and AbstractMethod are necessary so 310 // that FindClass can link members. 311 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 312 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 313 CHECK(java_lang_reflect_ArtField.Get() != NULL); 314 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 315 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 316 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 317 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 318 319 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 320 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 321 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 322 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 323 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 324 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 325 326 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 327 328 // Set up array classes for string, field, method 329 Handle<mirror::Class> object_array_string(hs.NewHandle( 330 AllocClass(self, java_lang_Class.Get(), 331 mirror::ObjectArray<mirror::String>::ClassSize()))); 332 object_array_string->SetComponentType(java_lang_String.Get()); 333 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 334 335 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 336 AllocClass(self, java_lang_Class.Get(), 337 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 338 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 339 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 340 341 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 342 AllocClass(self, java_lang_Class.Get(), 343 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 344 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 345 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 346 347 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 348 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 349 // these roots. 350 CHECK_NE(0U, boot_class_path.size()); 351 for (size_t i = 0; i != boot_class_path.size(); ++i) { 352 const DexFile* dex_file = boot_class_path[i]; 353 CHECK(dex_file != NULL); 354 AppendToBootClassPath(*dex_file); 355 } 356 357 // now we can use FindSystemClass 358 359 // run char class through InitializePrimitiveClass to finish init 360 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 361 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 362 363 // Create runtime resolution and imt conflict methods. Also setup the default imt. 364 Runtime* runtime = Runtime::Current(); 365 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 366 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 367 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 368 369 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 370 // we do not need friend classes or a publicly exposed setter. 371 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 372 373 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 374 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 375 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 376 CHECK_EQ(java_lang_Object.Get(), Object_class); 377 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 378 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 379 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 380 std::ostringstream os1, os2; 381 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 382 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 383 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 384 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 385 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 386 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 387 CHECK_EQ(java_lang_String.Get(), String_class); 388 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 389 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 390 391 // Setup the primitive array type classes - can't be done until Object has a vtable. 392 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 393 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 394 395 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 396 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 397 398 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 399 CHECK_EQ(char_array_class.Get(), found_char_array_class); 400 401 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 402 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 403 404 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 405 CHECK_EQ(int_array_class.Get(), found_int_array_class); 406 407 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 408 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 409 410 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 411 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 412 413 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 414 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 415 416 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 417 CHECK_EQ(class_array_class.Get(), found_class_array_class); 418 419 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 420 CHECK_EQ(object_array_class.Get(), found_object_array_class); 421 422 // Setup the single, global copy of "iftable". 423 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 424 CHECK(java_lang_Cloneable != NULL); 425 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 426 CHECK(java_io_Serializable != NULL); 427 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 428 // crawl up and explicitly list all of the supers as well. 429 { 430 mirror::IfTable* array_iftable = 431 ReadBarrier::BarrierForRoot<mirror::IfTable, kWithReadBarrier>(&array_iftable_); 432 array_iftable->SetInterface(0, java_lang_Cloneable); 433 array_iftable->SetInterface(1, java_io_Serializable); 434 } 435 436 // Sanity check Class[] and Object[]'s interfaces. 437 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 438 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 439 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 440 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 441 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 442 // dex_cache_ fields and register them in class_table_. 443 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 444 CHECK_EQ(java_lang_Class.Get(), Class_class); 445 446 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 447 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 448 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 449 450 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 451 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 452 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 453 454 mirror::Class* String_array_class = 455 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 456 CHECK_EQ(object_array_string.Get(), String_array_class); 457 458 mirror::Class* Art_method_array_class = 459 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 460 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 461 462 mirror::Class* Art_field_array_class = 463 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 464 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 465 466 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 467 468 // Create java.lang.reflect.Proxy root. 469 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 470 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 471 472 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 473 // finish initializing Reference class 474 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 475 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 476 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 477 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 478 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 479 mirror::Class* java_lang_ref_FinalizerReference = 480 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 481 java_lang_ref_FinalizerReference->SetAccessFlags( 482 java_lang_ref_FinalizerReference->GetAccessFlags() | 483 kAccClassIsReference | kAccClassIsFinalizerReference); 484 mirror::Class* java_lang_ref_PhantomReference = 485 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 486 java_lang_ref_PhantomReference->SetAccessFlags( 487 java_lang_ref_PhantomReference->GetAccessFlags() | 488 kAccClassIsReference | kAccClassIsPhantomReference); 489 mirror::Class* java_lang_ref_SoftReference = 490 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 491 java_lang_ref_SoftReference->SetAccessFlags( 492 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 493 mirror::Class* java_lang_ref_WeakReference = 494 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 495 java_lang_ref_WeakReference->SetAccessFlags( 496 java_lang_ref_WeakReference->GetAccessFlags() | 497 kAccClassIsReference | kAccClassIsWeakReference); 498 499 // Setup the ClassLoader, verifying the object_size_. 500 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 501 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 502 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 503 504 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 505 // java.lang.StackTraceElement as a convenience. 506 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 507 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 508 SetClassRoot(kJavaLangClassNotFoundException, 509 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 510 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 511 SetClassRoot(kJavaLangStackTraceElementArrayClass, 512 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 513 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 514 515 FinishInit(self); 516 517 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 518} 519 520void ClassLinker::FinishInit(Thread* self) { 521 VLOG(startup) << "ClassLinker::FinishInit entering"; 522 523 // Let the heap know some key offsets into java.lang.ref instances 524 // Note: we hard code the field indexes here rather than using FindInstanceField 525 // as the types of the field can't be resolved prior to the runtime being 526 // fully initialized 527 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 528 mirror::Class* java_lang_ref_FinalizerReference = 529 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 530 531 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 532 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 533 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 534 535 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 536 CHECK_STREQ(queue->GetName(), "queue"); 537 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 538 539 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 540 CHECK_STREQ(queueNext->GetName(), "queueNext"); 541 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 542 543 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 544 CHECK_STREQ(referent->GetName(), "referent"); 545 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 546 547 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 548 CHECK_STREQ(zombie->GetName(), "zombie"); 549 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 550 551 // ensure all class_roots_ are initialized 552 for (size_t i = 0; i < kClassRootsMax; i++) { 553 ClassRoot class_root = static_cast<ClassRoot>(i); 554 mirror::Class* klass = GetClassRoot(class_root); 555 CHECK(klass != NULL); 556 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 557 // note SetClassRoot does additional validation. 558 // if possible add new checks there to catch errors early 559 } 560 561 CHECK(array_iftable_ != NULL); 562 563 // disable the slow paths in FindClass and CreatePrimitiveClass now 564 // that Object, Class, and Object[] are setup 565 init_done_ = true; 566 567 VLOG(startup) << "ClassLinker::FinishInit exiting"; 568} 569 570void ClassLinker::RunRootClinits() { 571 Thread* self = Thread::Current(); 572 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 573 mirror::Class* c = GetClassRoot(ClassRoot(i)); 574 if (!c->IsArrayClass() && !c->IsPrimitive()) { 575 StackHandleScope<1> hs(self); 576 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 577 EnsureInitialized(h_class, true, true); 578 self->AssertNoPendingException(); 579 } 580 } 581} 582 583bool ClassLinker::GenerateOatFile(const char* dex_filename, 584 int oat_fd, 585 const char* oat_cache_filename, 586 std::string* error_msg) { 587 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 588 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 589 590 gc::Heap* heap = Runtime::Current()->GetHeap(); 591 std::string boot_image_option("--boot-image="); 592 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 593 594 std::string dex_file_option("--dex-file="); 595 dex_file_option += dex_filename; 596 597 std::string oat_fd_option("--oat-fd="); 598 StringAppendF(&oat_fd_option, "%d", oat_fd); 599 600 std::string oat_location_option("--oat-location="); 601 oat_location_option += oat_cache_filename; 602 603 std::vector<std::string> argv; 604 argv.push_back(dex2oat); 605 argv.push_back("--runtime-arg"); 606 argv.push_back("-classpath"); 607 argv.push_back("--runtime-arg"); 608 argv.push_back(Runtime::Current()->GetClassPathString()); 609 610 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 611 612 if (!Runtime::Current()->IsVerificationEnabled()) { 613 argv.push_back("--compiler-filter=verify-none"); 614 } 615 616 if (!kIsTargetBuild) { 617 argv.push_back("--host"); 618 } 619 620 argv.push_back(boot_image_option); 621 argv.push_back(dex_file_option); 622 argv.push_back(oat_fd_option); 623 argv.push_back(oat_location_option); 624 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 625 for (size_t i = 0; i < compiler_options.size(); ++i) { 626 argv.push_back(compiler_options[i].c_str()); 627 } 628 629 return Exec(argv, error_msg); 630} 631 632const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 633 WriterMutexLock mu(Thread::Current(), dex_lock_); 634 if (kIsDebugBuild) { 635 for (size_t i = 0; i < oat_files_.size(); ++i) { 636 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 637 } 638 } 639 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 640 oat_files_.push_back(oat_file); 641 return oat_file; 642} 643 644OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 645 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 646 OatFile* oat_file = space->ReleaseOatFile(); 647 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 648 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 649 return *oat_file; 650} 651 652const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 653 const char* dex_location = dex_file.GetLocation().c_str(); 654 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 655 return FindOpenedOatFile(nullptr, dex_location, &dex_location_checksum); 656} 657 658const OatFile* ClassLinker::FindOpenedOatFile(const char* oat_location, const char* dex_location, 659 const uint32_t* const dex_location_checksum) { 660 ReaderMutexLock mu(Thread::Current(), dex_lock_); 661 for (size_t i = 0; i < oat_files_.size(); i++) { 662 const OatFile* oat_file = oat_files_[i]; 663 DCHECK(oat_file != NULL); 664 665 if (oat_location != nullptr) { 666 if (oat_file->GetLocation() != oat_location) { 667 continue; 668 } 669 } 670 671 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 672 dex_location_checksum, 673 false); 674 if (oat_dex_file != NULL) { 675 return oat_file; 676 } 677 } 678 return NULL; 679} 680 681static std::string GetMultiDexClassesDexName(size_t number, const char* dex_location) { 682 if (number == 0) { 683 return dex_location; 684 } else { 685 return StringPrintf("%s" kMultiDexSeparatorString "classes%zu.dex", dex_location, number + 1); 686 } 687} 688 689static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, const char* dex_location, 690 bool generated, 691 std::vector<std::string>* error_msgs, 692 std::vector<const DexFile*>* dex_files) { 693 if (oat_file == nullptr) { 694 return false; 695 } 696 697 size_t old_size = dex_files->size(); // To rollback on error. 698 699 bool success = true; 700 for (size_t i = 0; success; ++i) { 701 std::string next_name_str = GetMultiDexClassesDexName(i, dex_location); 702 const char* next_name = next_name_str.c_str(); 703 704 uint32_t dex_location_checksum; 705 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 706 std::string error_msg; 707 if (!DexFile::GetChecksum(next_name, dex_location_checksum_pointer, &error_msg)) { 708 DCHECK_EQ(false, i == 0 && generated); 709 dex_location_checksum_pointer = nullptr; 710 } 711 712 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 713 714 if (oat_dex_file == nullptr) { 715 if (i == 0 && generated) { 716 std::string error_msg; 717 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 718 " file'%s'", dex_location, dex_location_checksum, 719 oat_file->GetLocation().c_str()); 720 error_msgs->push_back(error_msg); 721 } 722 break; // Not found, done. 723 } 724 725 // Checksum test. Test must succeed when generated. 726 success = !generated; 727 if (dex_location_checksum_pointer != nullptr) { 728 success = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 729 } 730 731 if (success) { 732 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 733 if (dex_file == nullptr) { 734 success = false; 735 error_msgs->push_back(error_msg); 736 } else { 737 dex_files->push_back(dex_file); 738 } 739 } 740 741 // When we generated the file, we expect success, or something is terribly wrong. 742 CHECK_EQ(false, generated && !success) 743 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 744 << std::hex << " dex_location_checksum=" << dex_location_checksum 745 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 746 } 747 748 if (dex_files->size() == old_size) { 749 success = false; // We did not even find classes.dex 750 } 751 752 if (success) { 753 return true; 754 } else { 755 // Free all the dex files we have loaded. 756 auto it = dex_files->begin() + old_size; 757 auto it_end = dex_files->end(); 758 for (; it != it_end; it++) { 759 delete *it; 760 } 761 dex_files->erase(dex_files->begin() + old_size, it_end); 762 763 return false; 764 } 765} 766 767// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 768// complicates the loading process, as we should not use an iterative loading process, because that 769// would register the oat file and dex files that come before the broken one. Instead, check all 770// multidex ahead of time. 771bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 772 std::vector<std::string>* error_msgs, 773 std::vector<const DexFile*>* dex_files) { 774 // 1) Check whether we have an open oat file. 775 // This requires a dex checksum, use the "primary" one. 776 uint32_t dex_location_checksum; 777 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 778 bool have_checksum = true; 779 std::string checksum_error_msg; 780 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 781 dex_location_checksum_pointer = nullptr; 782 have_checksum = false; 783 } 784 785 bool needs_registering = false; 786 787 std::unique_ptr<const OatFile> open_oat_file(FindOpenedOatFile(oat_location, dex_location, 788 dex_location_checksum_pointer)); 789 790 // 2) If we do not have an open one, maybe there's one on disk already. 791 792 // In case the oat file is not open, we play a locking game here so 793 // that if two different processes race to load and register or generate 794 // (or worse, one tries to open a partial generated file) we will be okay. 795 // This is actually common with apps that use DexClassLoader to work 796 // around the dex method reference limit and that have a background 797 // service running in a separate process. 798 ScopedFlock scoped_flock; 799 800 if (open_oat_file.get() == nullptr) { 801 if (oat_location != nullptr) { 802 // Can only do this if we have a checksum, else error. 803 if (!have_checksum) { 804 error_msgs->push_back(checksum_error_msg); 805 return false; 806 } 807 808 std::string error_msg; 809 810 // We are loading or creating one in the future. Time to set up the file lock. 811 if (!scoped_flock.Init(oat_location, &error_msg)) { 812 error_msgs->push_back(error_msg); 813 return false; 814 } 815 816 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 817 oat_location, &error_msg)); 818 819 if (open_oat_file.get() == nullptr) { 820 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 821 dex_location, oat_location, error_msg.c_str()); 822 VLOG(class_linker) << compound_msg; 823 error_msgs->push_back(compound_msg); 824 } 825 } else { 826 // TODO: What to lock here? 827 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 828 dex_location_checksum_pointer, 829 kRuntimeISA, error_msgs)); 830 } 831 needs_registering = true; 832 } 833 834 // 3) If we have an oat file, check all contained multidex files for our dex_location. 835 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 836 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, false, error_msgs, 837 dex_files); 838 if (success) { 839 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 840 if (needs_registering) { 841 // We opened the oat file, so we must register it. 842 RegisterOatFile(oat_file); 843 } 844 return true; 845 } else { 846 if (needs_registering) { 847 // We opened it, delete it. 848 open_oat_file.reset(); 849 } else { 850 open_oat_file.release(); // Do not delete open oat files. 851 } 852 } 853 854 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 855 856 // Need a checksum, fail else. 857 if (!have_checksum) { 858 error_msgs->push_back(checksum_error_msg); 859 return false; 860 } 861 862 // Look in cache location if no oat_location is given. 863 std::string cache_location; 864 if (oat_location == nullptr) { 865 // Use the dalvik cache. 866 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 867 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 868 oat_location = cache_location.c_str(); 869 } 870 871 // Definitely need to lock now. 872 if (!scoped_flock.HasFile()) { 873 std::string error_msg; 874 if (!scoped_flock.Init(oat_location, &error_msg)) { 875 error_msgs->push_back(error_msg); 876 return false; 877 } 878 } 879 880 // Create the oat file. 881 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 882 oat_location, error_msgs)); 883 884 // Failed, bail. 885 if (open_oat_file.get() == nullptr) { 886 return false; 887 } 888 889 // Try to load again, but stronger checks. 890 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, true, error_msgs, 891 dex_files); 892 if (success) { 893 RegisterOatFile(open_oat_file.release()); 894 return true; 895 } else { 896 return false; 897 } 898} 899 900const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 901 uint32_t dex_location_checksum, 902 const char* oat_location, 903 std::string* error_msg) { 904 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 905 !Runtime::Current()->IsCompiler(), 906 error_msg)); 907 if (oat_file.get() == nullptr) { 908 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 909 error_msg->c_str()); 910 return nullptr; 911 } 912 Runtime* runtime = Runtime::Current(); 913 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 914 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 915 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 916 if (expected_image_oat_checksum != actual_image_oat_checksum) { 917 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 918 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 919 actual_image_oat_checksum); 920 return nullptr; 921 } 922 923 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 924 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 925 if (expected_image_oat_offset != actual_image_oat_offset) { 926 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 927 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 928 actual_image_oat_offset); 929 return nullptr; 930 } 931 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 932 &dex_location_checksum); 933 if (oat_dex_file == nullptr) { 934 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 935 dex_location); 936 return nullptr; 937 } 938 uint32_t expected_dex_checksum = dex_location_checksum; 939 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 940 if (expected_dex_checksum != actual_dex_checksum) { 941 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 942 "found 0x%x", oat_location, expected_dex_checksum, 943 actual_dex_checksum); 944 return nullptr; 945 } 946 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 947 if (dex_file.get() != nullptr) { 948 return oat_file.release(); 949 } else { 950 return nullptr; 951 } 952} 953 954const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 955 int fd, const char* oat_location, 956 std::vector<std::string>* error_msgs) { 957 // Generate the output oat file for the dex file 958 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 959 std::string error_msg; 960 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 961 CHECK(!error_msg.empty()); 962 error_msgs->push_back(error_msg); 963 return nullptr; 964 } 965 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 966 !Runtime::Current()->IsCompiler(), 967 &error_msg)); 968 if (oat_file.get() == nullptr) { 969 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 970 oat_location, error_msg.c_str()); 971 error_msgs->push_back(compound_msg); 972 return nullptr; 973 } 974 975 return oat_file.release(); 976} 977 978bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 979 const char* dex_location, 980 uint32_t dex_location_checksum, 981 const InstructionSet instruction_set, 982 std::string* error_msg) { 983 Runtime* runtime = Runtime::Current(); 984 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 985 986 // If the requested instruction set is the same as the current runtime, 987 // we can use the checksums directly. If it isn't, we'll have to read the 988 // image header from the image for the right instruction set. 989 uint32_t image_oat_checksum = 0; 990 uintptr_t image_oat_data_begin = 0; 991 if (instruction_set == kRuntimeISA) { 992 const ImageHeader& image_header = image_space->GetImageHeader(); 993 image_oat_checksum = image_header.GetOatChecksum(); 994 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 995 } else { 996 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 997 image_space->GetImageLocation().c_str(), instruction_set)); 998 image_oat_checksum = image_header->GetOatChecksum(); 999 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1000 } 1001 const OatHeader& oat_header = oat_file->GetOatHeader(); 1002 bool image_check = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1003 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1004 1005 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1006 &dex_location_checksum); 1007 if (oat_dex_file == NULL) { 1008 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1009 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1010 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 1011 for (size_t i = 0; i < oat_dex_files.size(); i++) { 1012 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 1013 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 1014 oat_file->GetLocation().c_str(), 1015 oat_dex_file->GetDexFileLocation().c_str()); 1016 } 1017 return false; 1018 } 1019 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 1020 1021 if (image_check && dex_check) { 1022 return true; 1023 } 1024 1025 if (!image_check) { 1026 ScopedObjectAccess soa(Thread::Current()); 1027 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with (0x%x, %" PRIdPTR ")", 1028 oat_file->GetLocation().c_str(), 1029 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1030 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1031 image_oat_checksum, image_oat_data_begin); 1032 } 1033 if (!dex_check) { 1034 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1035 oat_file->GetLocation().c_str(), 1036 oat_dex_file->GetDexFileLocationChecksum(), 1037 dex_location, dex_location_checksum); 1038 } 1039 return false; 1040} 1041 1042const OatFile* ClassLinker::LoadOatFileAndVerifyDexFile(const std::string& oat_file_location, 1043 const char* dex_location, 1044 std::string* error_msg, 1045 bool* open_failed) { 1046 std::unique_ptr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 1047 if (oat_file.get() == nullptr) { 1048 *open_failed = true; 1049 return nullptr; 1050 } 1051 *open_failed = false; 1052 std::unique_ptr<const DexFile> dex_file; 1053 uint32_t dex_location_checksum; 1054 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 1055 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1056 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1057 // directory. 1058 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1059 if (oat_dex_file == nullptr) { 1060 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1061 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 1062 error_msg->c_str()); 1063 return nullptr; 1064 } 1065 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1066 } else { 1067 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 1068 kRuntimeISA, error_msg); 1069 if (!verified) { 1070 return nullptr; 1071 } 1072 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1073 &dex_location_checksum)->OpenDexFile(error_msg)); 1074 } 1075 1076 if (dex_file.get() != nullptr) { 1077 return oat_file.release(); 1078 } else { 1079 return nullptr; 1080 } 1081} 1082 1083const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1084 const char* dex_location, 1085 const uint32_t* const dex_location_checksum, 1086 InstructionSet isa, 1087 std::vector<std::string>* error_msgs) { 1088 // Look for an existing file next to dex. for example, for 1089 // /foo/bar/baz.jar, look for /foo/bar/<isa>/baz.odex. 1090 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1091 bool open_failed; 1092 std::string error_msg; 1093 const OatFile* oat_file = LoadOatFileAndVerifyDexFile(odex_filename, dex_location, &error_msg, 1094 &open_failed); 1095 if (oat_file != nullptr) { 1096 return oat_file; 1097 } 1098 if (dex_location_checksum == nullptr) { 1099 error_msgs->push_back(StringPrintf("Failed to open oat file from %s and no classes.dex found in" 1100 "%s: %s", odex_filename.c_str(), dex_location, 1101 error_msg.c_str())); 1102 return nullptr; 1103 } 1104 1105 std::string cache_error_msg; 1106 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 1107 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location, 1108 dalvik_cache.c_str())); 1109 oat_file = LoadOatFileAndVerifyDexFile(cache_location, dex_location, &cache_error_msg, 1110 &open_failed); 1111 if (oat_file != nullptr) { 1112 return oat_file; 1113 } 1114 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 1115 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 1116 } 1117 std::string compound_msg = StringPrintf("Failed to open oat file from %s (error '%s') or %s " 1118 "(error '%s').", odex_filename.c_str(), error_msg.c_str(), 1119 cache_location.c_str(), cache_error_msg.c_str()); 1120 VLOG(class_linker) << compound_msg; 1121 error_msgs->push_back(compound_msg); 1122 1123 return nullptr; 1124} 1125 1126const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1127 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1128 for (size_t i = 0; i < oat_files_.size(); i++) { 1129 const OatFile* oat_file = oat_files_[i]; 1130 DCHECK(oat_file != nullptr); 1131 if (oat_file->GetLocation() == oat_location) { 1132 return oat_file; 1133 } 1134 } 1135 return nullptr; 1136} 1137 1138const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1139 std::string* error_msg) { 1140 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1141 if (oat_file != nullptr) { 1142 return oat_file; 1143 } 1144 1145 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1146 error_msg); 1147 if (oat_file == NULL) { 1148 return NULL; 1149 } 1150 return oat_file; 1151} 1152 1153static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1154 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1155 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1156 1157 DCHECK(obj != NULL); 1158 DCHECK(class_linker != NULL); 1159 1160 if (obj->IsArtMethod()) { 1161 mirror::ArtMethod* method = obj->AsArtMethod(); 1162 if (!method->IsNative()) { 1163 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1164 if (method != Runtime::Current()->GetResolutionMethod()) { 1165 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1166 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1167 } 1168 } 1169 } 1170} 1171 1172void ClassLinker::InitFromImage() { 1173 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1174 CHECK(!init_done_); 1175 1176 Thread* self = Thread::Current(); 1177 gc::Heap* heap = Runtime::Current()->GetHeap(); 1178 gc::space::ImageSpace* space = heap->GetImageSpace(); 1179 dex_cache_image_class_lookup_required_ = true; 1180 CHECK(space != NULL); 1181 OatFile& oat_file = GetImageOatFile(space); 1182 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1183 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1184 const char* image_file_location = oat_file.GetOatHeader(). 1185 GetStoreValueByKey(OatHeader::kImageLocationKey); 1186 CHECK(image_file_location == nullptr || *image_file_location == 0); 1187 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1188 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1189 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1190 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1191 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1192 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1193 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1194 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1195 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1196 1197 StackHandleScope<1> hs(self); 1198 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1199 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1200 AsObjectArray<mirror::Class>())); 1201 class_roots_ = class_roots.Get(); 1202 1203 // Special case of setting up the String class early so that we can test arbitrary objects 1204 // as being Strings or not 1205 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1206 1207 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1208 static_cast<uint32_t>(dex_caches->GetLength())); 1209 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1210 StackHandleScope<1> hs(self); 1211 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1212 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1213 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1214 nullptr); 1215 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1216 std::string error_msg; 1217 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1218 if (dex_file == NULL) { 1219 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1220 << " from within oat file " << oat_file.GetLocation() 1221 << " error '" << error_msg << "'"; 1222 } 1223 1224 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1225 1226 AppendToBootClassPath(*dex_file, dex_cache); 1227 } 1228 1229 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1230 // bitmap walk. 1231 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1232 1233 // Set entry point to interpreter if in InterpretOnly mode. 1234 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1235 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1236 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1237 } 1238 1239 // reinit class_roots_ 1240 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1241 class_roots_ = class_roots.Get(); 1242 1243 // reinit array_iftable_ from any array class instance, they should be == 1244 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1245 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1246 // String class root was set above 1247 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1248 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1249 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1250 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1251 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1252 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1253 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1254 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1255 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1256 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1257 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1258 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1259 1260 FinishInit(self); 1261 1262 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1263} 1264 1265void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1266 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1267 if ((flags & kVisitRootFlagAllRoots) != 0) { 1268 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1269 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1270 } 1271 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1272 for (auto& pair : new_class_roots_) { 1273 mirror::Object* old_ref = pair.second; 1274 callback(reinterpret_cast<mirror::Object**>(&pair.second), arg, 0, kRootStickyClass); 1275 if (UNLIKELY(pair.second != old_ref)) { 1276 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1277 // corresponding object. This is slow, but luckily for us, this may only happen with a 1278 // concurrent moving GC. 1279 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1280 it != end && it->first == pair.first; ++it) { 1281 // If the class stored matches the old class, update it to the new value. 1282 if (old_ref == it->second) { 1283 it->second = pair.second; 1284 } 1285 } 1286 } 1287 } 1288 } 1289 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1290 new_class_roots_.clear(); 1291 } 1292 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1293 log_new_class_table_roots_ = true; 1294 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1295 log_new_class_table_roots_ = false; 1296 } 1297 // We deliberately ignore the class roots in the image since we 1298 // handle image roots by using the MS/CMS rescanning of dirty cards. 1299} 1300 1301// Keep in sync with InitCallback. Anything we visit, we need to 1302// reinit references to when reinitializing a ClassLinker from a 1303// mapped image. 1304void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1305 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1306 Thread* self = Thread::Current(); 1307 { 1308 ReaderMutexLock mu(self, dex_lock_); 1309 if ((flags & kVisitRootFlagAllRoots) != 0) { 1310 for (mirror::DexCache*& dex_cache : dex_caches_) { 1311 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1312 } 1313 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1314 for (size_t index : new_dex_cache_roots_) { 1315 callback(reinterpret_cast<mirror::Object**>(&dex_caches_[index]), arg, 0, kRootVMInternal); 1316 } 1317 } 1318 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1319 new_dex_cache_roots_.clear(); 1320 } 1321 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1322 log_new_dex_caches_roots_ = true; 1323 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1324 log_new_dex_caches_roots_ = false; 1325 } 1326 } 1327 VisitClassRoots(callback, arg, flags); 1328 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1329 DCHECK(array_iftable_ != nullptr); 1330 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1331 if (find_array_class_cache_[i] != nullptr) { 1332 callback(reinterpret_cast<mirror::Object**>(&find_array_class_cache_[i]), arg, 0, 1333 kRootVMInternal); 1334 } 1335 } 1336} 1337 1338void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1339 if (dex_cache_image_class_lookup_required_) { 1340 MoveImageClassesToClassTable(); 1341 } 1342 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1343 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1344 mirror::Class** root = &it.second; 1345 mirror::Class* c = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 1346 if (!visitor(c, arg)) { 1347 return; 1348 } 1349 } 1350} 1351 1352static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1353 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1354 classes->insert(c); 1355 return true; 1356} 1357 1358void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1359 std::set<mirror::Class*> classes; 1360 VisitClasses(GetClassesVisitor, &classes); 1361 for (mirror::Class* klass : classes) { 1362 if (!visitor(klass, arg)) { 1363 return; 1364 } 1365 } 1366} 1367 1368ClassLinker::~ClassLinker() { 1369 mirror::Class::ResetClass(); 1370 mirror::String::ResetClass(); 1371 mirror::Reference::ResetClass(); 1372 mirror::ArtField::ResetClass(); 1373 mirror::ArtMethod::ResetClass(); 1374 mirror::BooleanArray::ResetArrayClass(); 1375 mirror::ByteArray::ResetArrayClass(); 1376 mirror::CharArray::ResetArrayClass(); 1377 mirror::DoubleArray::ResetArrayClass(); 1378 mirror::FloatArray::ResetArrayClass(); 1379 mirror::IntArray::ResetArrayClass(); 1380 mirror::LongArray::ResetArrayClass(); 1381 mirror::ShortArray::ResetArrayClass(); 1382 mirror::Throwable::ResetClass(); 1383 mirror::StackTraceElement::ResetClass(); 1384 STLDeleteElements(&boot_class_path_); 1385 STLDeleteElements(&oat_files_); 1386} 1387 1388mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1389 gc::Heap* heap = Runtime::Current()->GetHeap(); 1390 StackHandleScope<16> hs(self); 1391 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1392 Handle<mirror::DexCache> dex_cache( 1393 hs.NewHandle(down_cast<mirror::DexCache*>( 1394 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1395 VoidFunctor())))); 1396 if (dex_cache.Get() == NULL) { 1397 return NULL; 1398 } 1399 Handle<mirror::String> 1400 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1401 if (location.Get() == NULL) { 1402 return NULL; 1403 } 1404 Handle<mirror::ObjectArray<mirror::String>> 1405 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1406 if (strings.Get() == NULL) { 1407 return NULL; 1408 } 1409 Handle<mirror::ObjectArray<mirror::Class>> 1410 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1411 if (types.Get() == NULL) { 1412 return NULL; 1413 } 1414 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1415 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1416 if (methods.Get() == NULL) { 1417 return NULL; 1418 } 1419 Handle<mirror::ObjectArray<mirror::ArtField>> 1420 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1421 if (fields.Get() == NULL) { 1422 return NULL; 1423 } 1424 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1425 fields.Get()); 1426 return dex_cache.Get(); 1427} 1428 1429mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1430 uint32_t class_size) { 1431 DCHECK_GE(class_size, sizeof(mirror::Class)); 1432 gc::Heap* heap = Runtime::Current()->GetHeap(); 1433 mirror::Class::InitializeClassVisitor visitor(class_size); 1434 mirror::Object* k = kMovingClasses ? 1435 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1436 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1437 if (UNLIKELY(k == nullptr)) { 1438 CHECK(self->IsExceptionPending()); // OOME. 1439 return nullptr; 1440 } 1441 return k->AsClass(); 1442} 1443 1444mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1445 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1446} 1447 1448mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1449 return down_cast<mirror::ArtField*>( 1450 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1451} 1452 1453mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1454 return down_cast<mirror::ArtMethod*>( 1455 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1456} 1457 1458mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1459 Thread* self, size_t length) { 1460 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1461 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1462} 1463 1464mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1465 mirror::Class* klass) { 1466 DCHECK(klass != NULL); 1467 1468 // For temporary classes we must wait for them to be retired. 1469 if (init_done_ && klass->IsTemp()) { 1470 CHECK(!klass->IsResolved()); 1471 if (klass->IsErroneous()) { 1472 ThrowEarlierClassFailure(klass); 1473 return nullptr; 1474 } 1475 StackHandleScope<1> hs(self); 1476 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1477 ObjectLock<mirror::Class> lock(self, h_class); 1478 // Loop and wait for the resolving thread to retire this class. 1479 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1480 lock.WaitIgnoringInterrupts(); 1481 } 1482 if (h_class->IsErroneous()) { 1483 ThrowEarlierClassFailure(h_class.Get()); 1484 return nullptr; 1485 } 1486 CHECK(h_class->IsRetired()); 1487 // Get the updated class from class table. 1488 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1489 } 1490 1491 // Wait for the class if it has not already been linked. 1492 if (!klass->IsResolved() && !klass->IsErroneous()) { 1493 StackHandleScope<1> hs(self); 1494 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1495 ObjectLock<mirror::Class> lock(self, h_class); 1496 // Check for circular dependencies between classes. 1497 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1498 ThrowClassCircularityError(h_class.Get()); 1499 h_class->SetStatus(mirror::Class::kStatusError, self); 1500 return nullptr; 1501 } 1502 // Wait for the pending initialization to complete. 1503 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1504 lock.WaitIgnoringInterrupts(); 1505 } 1506 } 1507 1508 if (klass->IsErroneous()) { 1509 ThrowEarlierClassFailure(klass); 1510 return nullptr; 1511 } 1512 // Return the loaded class. No exceptions should be pending. 1513 CHECK(klass->IsResolved()) << PrettyClass(klass); 1514 self->AssertNoPendingException(); 1515 return klass; 1516} 1517 1518mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1519 Handle<mirror::ClassLoader> class_loader) { 1520 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1521 DCHECK(self != nullptr); 1522 self->AssertNoPendingException(); 1523 if (descriptor[1] == '\0') { 1524 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1525 // for primitive classes that aren't backed by dex files. 1526 return FindPrimitiveClass(descriptor[0]); 1527 } 1528 // Find the class in the loaded classes table. 1529 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1530 if (klass != NULL) { 1531 return EnsureResolved(self, descriptor, klass); 1532 } 1533 // Class is not yet loaded. 1534 if (descriptor[0] == '[') { 1535 return CreateArrayClass(self, descriptor, class_loader); 1536 } else if (class_loader.Get() == nullptr) { 1537 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1538 if (pair.second != NULL) { 1539 StackHandleScope<1> hs(self); 1540 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1541 } 1542 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1543 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1544 // throw of a NoClassDefFoundError. 1545 if (IsInBootClassPath(descriptor)) { 1546 mirror::Class* system_class = FindSystemClass(self, descriptor); 1547 CHECK(system_class != NULL); 1548 return system_class; 1549 } 1550 // Next try the compile time class path. 1551 const std::vector<const DexFile*>* class_path; 1552 { 1553 ScopedObjectAccessUnchecked soa(self); 1554 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1555 soa.AddLocalReference<jobject>(class_loader.Get())); 1556 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1557 } 1558 1559 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1560 if (pair.second != NULL) { 1561 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1562 } 1563 1564 } else { 1565 ScopedObjectAccessUnchecked soa(self); 1566 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1567 soa.AddLocalReference<jobject>(class_loader.Get())); 1568 std::string class_name_string(DescriptorToDot(descriptor)); 1569 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1570 { 1571 ScopedThreadStateChange tsc(self, kNative); 1572 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1573 soa.Env()->NewStringUTF(class_name_string.c_str())); 1574 if (class_name_object.get() == NULL) { 1575 return NULL; 1576 } 1577 CHECK(class_loader_object.get() != NULL); 1578 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1579 WellKnownClasses::java_lang_ClassLoader_loadClass, 1580 class_name_object.get())); 1581 } 1582 if (self->IsExceptionPending()) { 1583 // If the ClassLoader threw, pass that exception up. 1584 return NULL; 1585 } else if (result.get() == NULL) { 1586 // broken loader - throw NPE to be compatible with Dalvik 1587 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1588 class_name_string.c_str()).c_str()); 1589 return NULL; 1590 } else { 1591 // success, return mirror::Class* 1592 return soa.Decode<mirror::Class*>(result.get()); 1593 } 1594 } 1595 1596 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1597 return NULL; 1598} 1599 1600mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1601 Handle<mirror::ClassLoader> class_loader, 1602 const DexFile& dex_file, 1603 const DexFile::ClassDef& dex_class_def) { 1604 Thread* self = Thread::Current(); 1605 StackHandleScope<3> hs(self); 1606 auto klass = hs.NewHandle<mirror::Class>(nullptr); 1607 bool should_allocate = false; 1608 1609 // Load the class from the dex file. 1610 if (UNLIKELY(!init_done_)) { 1611 // finish up init of hand crafted class_roots_ 1612 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1613 klass.Assign(GetClassRoot(kJavaLangObject)); 1614 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1615 klass.Assign(GetClassRoot(kJavaLangClass)); 1616 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1617 klass.Assign(GetClassRoot(kJavaLangString)); 1618 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 1619 klass.Assign(GetClassRoot(kJavaLangRefReference)); 1620 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1621 klass.Assign(GetClassRoot(kJavaLangDexCache)); 1622 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1623 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 1624 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1625 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 1626 } else { 1627 should_allocate = true; 1628 } 1629 } else { 1630 should_allocate = true; 1631 } 1632 1633 if (should_allocate) { 1634 // Allocate a class with the status of not ready. 1635 // Interface object should get the right size here. Regular class will 1636 // figure out the right size later and be replaced with one of the right 1637 // size when the class becomes resolved. 1638 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 1639 } 1640 if (UNLIKELY(klass.Get() == NULL)) { 1641 CHECK(self->IsExceptionPending()); // Expect an OOME. 1642 return NULL; 1643 } 1644 klass->SetDexCache(FindDexCache(dex_file)); 1645 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 1646 // Check for a pending exception during load 1647 if (self->IsExceptionPending()) { 1648 klass->SetStatus(mirror::Class::kStatusError, self); 1649 return NULL; 1650 } 1651 ObjectLock<mirror::Class> lock(self, klass); 1652 klass->SetClinitThreadId(self->GetTid()); 1653 1654 // Add the newly loaded class to the loaded classes table. 1655 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 1656 if (existing != NULL) { 1657 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1658 // this thread to block. 1659 return EnsureResolved(self, descriptor, existing); 1660 } 1661 1662 // Finish loading (if necessary) by finding parents 1663 CHECK(!klass->IsLoaded()); 1664 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1665 // Loading failed. 1666 klass->SetStatus(mirror::Class::kStatusError, self); 1667 return NULL; 1668 } 1669 CHECK(klass->IsLoaded()); 1670 // Link the class (if necessary) 1671 CHECK(!klass->IsResolved()); 1672 // TODO: Use fast jobjects? 1673 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1674 1675 mirror::Class* new_class = nullptr; 1676 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 1677 // Linking failed. 1678 klass->SetStatus(mirror::Class::kStatusError, self); 1679 return NULL; 1680 } 1681 CHECK(new_class != nullptr) << descriptor; 1682 CHECK(new_class->IsResolved()) << descriptor; 1683 1684 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 1685 1686 /* 1687 * We send CLASS_PREPARE events to the debugger from here. The 1688 * definition of "preparation" is creating the static fields for a 1689 * class and initializing them to the standard default values, but not 1690 * executing any code (that comes later, during "initialization"). 1691 * 1692 * We did the static preparation in LinkClass. 1693 * 1694 * The class has been prepared and resolved but possibly not yet verified 1695 * at this point. 1696 */ 1697 Dbg::PostClassPrepare(new_class_h.Get()); 1698 1699 return new_class_h.Get(); 1700} 1701 1702uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 1703 const DexFile::ClassDef& dex_class_def) { 1704 const byte* class_data = dex_file.GetClassData(dex_class_def); 1705 size_t num_ref = 0; 1706 size_t num_32 = 0; 1707 size_t num_64 = 0; 1708 if (class_data != NULL) { 1709 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1710 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1711 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1712 char c = descriptor[0]; 1713 if (c == 'L' || c == '[') { 1714 num_ref++; 1715 } else if (c == 'J' || c == 'D') { 1716 num_64++; 1717 } else { 1718 num_32++; 1719 } 1720 } 1721 } 1722 return mirror::Class::ComputeClassSize(false, 0, num_32, num_64, num_ref); 1723} 1724 1725OatFile::OatClass ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1726 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1727 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1728 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1729 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1730 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1731 &dex_location_checksum); 1732 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1733 return oat_dex_file->GetOatClass(class_def_idx); 1734} 1735 1736static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1737 uint32_t method_idx) { 1738 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1739 const byte* class_data = dex_file.GetClassData(class_def); 1740 CHECK(class_data != NULL); 1741 ClassDataItemIterator it(dex_file, class_data); 1742 // Skip fields 1743 while (it.HasNextStaticField()) { 1744 it.Next(); 1745 } 1746 while (it.HasNextInstanceField()) { 1747 it.Next(); 1748 } 1749 // Process methods 1750 size_t class_def_method_index = 0; 1751 while (it.HasNextDirectMethod()) { 1752 if (it.GetMemberIndex() == method_idx) { 1753 return class_def_method_index; 1754 } 1755 class_def_method_index++; 1756 it.Next(); 1757 } 1758 while (it.HasNextVirtualMethod()) { 1759 if (it.GetMemberIndex() == method_idx) { 1760 return class_def_method_index; 1761 } 1762 class_def_method_index++; 1763 it.Next(); 1764 } 1765 DCHECK(!it.HasNext()); 1766 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1767 return 0; 1768} 1769 1770const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1771 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1772 // method for direct methods (or virtual methods made direct). 1773 mirror::Class* declaring_class = method->GetDeclaringClass(); 1774 size_t oat_method_index; 1775 if (method->IsStatic() || method->IsDirect()) { 1776 // Simple case where the oat method index was stashed at load time. 1777 oat_method_index = method->GetMethodIndex(); 1778 } else { 1779 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1780 // by search for its position in the declared virtual methods. 1781 oat_method_index = declaring_class->NumDirectMethods(); 1782 size_t end = declaring_class->NumVirtualMethods(); 1783 bool found = false; 1784 for (size_t i = 0; i < end; i++) { 1785 if (declaring_class->GetVirtualMethod(i) == method) { 1786 found = true; 1787 break; 1788 } 1789 oat_method_index++; 1790 } 1791 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1792 } 1793 DCHECK_EQ(oat_method_index, 1794 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1795 method->GetDeclaringClass()->GetDexClassDefIndex(), 1796 method->GetDexMethodIndex())); 1797 const OatFile::OatClass oat_class = GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1798 declaring_class->GetDexClassDefIndex()); 1799 1800 return oat_class.GetOatMethod(oat_method_index); 1801} 1802 1803// Special case to get oat code without overwriting a trampoline. 1804const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1805 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1806 if (method->IsProxyMethod()) { 1807 return GetQuickProxyInvokeHandler(); 1808 } 1809 const void* result = GetOatMethodFor(method).GetQuickCode(); 1810 if (result == nullptr) { 1811 if (method->IsNative()) { 1812 // No code and native? Use generic trampoline. 1813 result = GetQuickGenericJniTrampoline(); 1814 } else if (method->IsPortableCompiled()) { 1815 // No code? Do we expect portable code? 1816 result = GetQuickToPortableBridge(); 1817 } else { 1818 // No code? You must mean to go into the interpreter. 1819 result = GetQuickToInterpreterBridge(); 1820 } 1821 } 1822 return result; 1823} 1824 1825const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1826 bool* have_portable_code) { 1827 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1828 *have_portable_code = false; 1829 if (method->IsProxyMethod()) { 1830 return GetPortableProxyInvokeHandler(); 1831 } 1832 const OatFile::OatMethod oat_method = GetOatMethodFor(method); 1833 const void* result = oat_method.GetPortableCode(); 1834 if (result == nullptr) { 1835 if (oat_method.GetQuickCode() == nullptr) { 1836 // No code? You must mean to go into the interpreter. 1837 result = GetPortableToInterpreterBridge(); 1838 } else { 1839 // No code? But there's quick code, so use a bridge. 1840 result = GetPortableToQuickBridge(); 1841 } 1842 } else { 1843 *have_portable_code = true; 1844 } 1845 return result; 1846} 1847 1848const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1849 uint32_t method_idx) { 1850 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1851 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1852 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 1853} 1854 1855const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1856 uint32_t method_idx) { 1857 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1858 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1859 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 1860} 1861 1862// Returns true if the method must run with interpreter, false otherwise. 1863static bool NeedsInterpreter( 1864 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 1865 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1866 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1867 // No code: need interpreter. 1868 // May return true for native code, in the case of generic JNI 1869 // DCHECK(!method->IsNative()); 1870 return true; 1871 } 1872#ifdef ART_SEA_IR_MODE 1873 ScopedObjectAccess soa(Thread::Current()); 1874 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1875 LOG(INFO) << "Found " << PrettyMethod(method); 1876 return false; 1877 } 1878#endif 1879 // If interpreter mode is enabled, every method (except native and proxy) must 1880 // be run with interpreter. 1881 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1882 !method->IsNative() && !method->IsProxyMethod(); 1883} 1884 1885void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1886 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1887 if (klass->NumDirectMethods() == 0) { 1888 return; // No direct methods => no static methods. 1889 } 1890 Runtime* runtime = Runtime::Current(); 1891 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1892 return; // OAT file unavailable. 1893 } 1894 const DexFile& dex_file = klass->GetDexFile(); 1895 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 1896 CHECK(dex_class_def != nullptr); 1897 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1898 // There should always be class data if there were direct methods. 1899 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1900 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 1901 ClassDataItemIterator it(dex_file, class_data); 1902 // Skip fields 1903 while (it.HasNextStaticField()) { 1904 it.Next(); 1905 } 1906 while (it.HasNextInstanceField()) { 1907 it.Next(); 1908 } 1909 // Link the code of methods skipped by LinkCode. 1910 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1911 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1912 if (!method->IsStatic()) { 1913 // Only update static methods. 1914 continue; 1915 } 1916 const void* portable_code = oat_class.GetOatMethod(method_index).GetPortableCode(); 1917 const void* quick_code = oat_class.GetOatMethod(method_index).GetQuickCode(); 1918 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1919 bool have_portable_code = false; 1920 if (enter_interpreter) { 1921 // Use interpreter entry point. 1922 // Check whether the method is native, in which case it's generic JNI. 1923 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 1924 quick_code = GetQuickGenericJniTrampoline(); 1925 portable_code = GetPortableToQuickBridge(); 1926 } else { 1927 portable_code = GetPortableToInterpreterBridge(); 1928 quick_code = GetQuickToInterpreterBridge(); 1929 } 1930 } else { 1931 if (portable_code == nullptr) { 1932 portable_code = GetPortableToQuickBridge(); 1933 } else { 1934 have_portable_code = true; 1935 } 1936 if (quick_code == nullptr) { 1937 quick_code = GetQuickToPortableBridge(); 1938 } 1939 } 1940 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1941 have_portable_code); 1942 } 1943 // Ignore virtual methods on the iterator. 1944} 1945 1946void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 1947 const DexFile& dex_file, uint32_t dex_method_index, 1948 uint32_t method_index) { 1949 // Method shouldn't have already been linked. 1950 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1951 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1952 // Every kind of method should at least get an invoke stub from the oat_method. 1953 // non-abstract methods also get their code pointers. 1954 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1955 oat_method.LinkMethod(method.Get()); 1956 1957 // Install entry point from interpreter. 1958 Runtime* runtime = Runtime::Current(); 1959 bool enter_interpreter = NeedsInterpreter(method.Get(), 1960 method->GetEntryPointFromQuickCompiledCode(), 1961 method->GetEntryPointFromPortableCompiledCode()); 1962 if (enter_interpreter && !method->IsNative()) { 1963 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1964 } else { 1965 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1966 } 1967 1968 if (method->IsAbstract()) { 1969 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1970 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1971 return; 1972 } 1973 1974 bool have_portable_code = false; 1975 if (method->IsStatic() && !method->IsConstructor()) { 1976 // For static methods excluding the class initializer, install the trampoline. 1977 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1978 // after initializing class (see ClassLinker::InitializeClass method). 1979 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 1980 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 1981 } else if (enter_interpreter) { 1982 if (!method->IsNative()) { 1983 // Set entry point from compiled code if there's no code or in interpreter only mode. 1984 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1985 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1986 } else { 1987 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 1988 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1989 } 1990 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1991 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1992 have_portable_code = true; 1993 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1994 } else { 1995 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1996 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1997 } 1998 1999 if (method->IsNative()) { 2000 // Unregistering restores the dlsym lookup stub. 2001 method->UnregisterNative(Thread::Current()); 2002 2003 if (enter_interpreter) { 2004 // We have a native method here without code. Then it should have either the GenericJni 2005 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2006 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2007 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2008 } 2009 } 2010 2011 // Allow instrumentation its chance to hijack code. 2012 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2013 method->GetEntryPointFromQuickCompiledCode(), 2014 method->GetEntryPointFromPortableCompiledCode(), 2015 have_portable_code); 2016} 2017 2018void ClassLinker::LoadClass(const DexFile& dex_file, 2019 const DexFile::ClassDef& dex_class_def, 2020 Handle<mirror::Class> klass, 2021 mirror::ClassLoader* class_loader) { 2022 CHECK(klass.Get() != NULL); 2023 CHECK(klass->GetDexCache() != NULL); 2024 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2025 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2026 CHECK(descriptor != NULL); 2027 2028 klass->SetClass(GetClassRoot(kJavaLangClass)); 2029 if (kUseBakerOrBrooksReadBarrier) { 2030 klass->AssertReadBarrierPointer(); 2031 } 2032 uint32_t access_flags = dex_class_def.access_flags_; 2033 // Make sure that none of our runtime-only flags are set. 2034 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2035 klass->SetAccessFlags(access_flags); 2036 klass->SetClassLoader(class_loader); 2037 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2038 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2039 2040 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2041 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2042 2043 const byte* class_data = dex_file.GetClassData(dex_class_def); 2044 if (class_data == NULL) { 2045 return; // no fields or methods - for example a marker interface 2046 } 2047 2048 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2049 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 2050 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2051 } else { 2052 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2053 } 2054} 2055 2056void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2057 const byte* class_data, 2058 Handle<mirror::Class> klass, 2059 mirror::ClassLoader* class_loader, 2060 const OatFile::OatClass* oat_class) { 2061 // Load fields. 2062 ClassDataItemIterator it(dex_file, class_data); 2063 Thread* self = Thread::Current(); 2064 if (it.NumStaticFields() != 0) { 2065 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2066 if (UNLIKELY(statics == NULL)) { 2067 CHECK(self->IsExceptionPending()); // OOME. 2068 return; 2069 } 2070 klass->SetSFields(statics); 2071 } 2072 if (it.NumInstanceFields() != 0) { 2073 mirror::ObjectArray<mirror::ArtField>* fields = 2074 AllocArtFieldArray(self, it.NumInstanceFields()); 2075 if (UNLIKELY(fields == NULL)) { 2076 CHECK(self->IsExceptionPending()); // OOME. 2077 return; 2078 } 2079 klass->SetIFields(fields); 2080 } 2081 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2082 StackHandleScope<1> hs(self); 2083 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2084 if (UNLIKELY(sfield.Get() == NULL)) { 2085 CHECK(self->IsExceptionPending()); // OOME. 2086 return; 2087 } 2088 klass->SetStaticField(i, sfield.Get()); 2089 LoadField(dex_file, it, klass, sfield); 2090 } 2091 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2092 StackHandleScope<1> hs(self); 2093 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2094 if (UNLIKELY(ifield.Get() == NULL)) { 2095 CHECK(self->IsExceptionPending()); // OOME. 2096 return; 2097 } 2098 klass->SetInstanceField(i, ifield.Get()); 2099 LoadField(dex_file, it, klass, ifield); 2100 } 2101 2102 // Load methods. 2103 if (it.NumDirectMethods() != 0) { 2104 // TODO: append direct methods to class object 2105 mirror::ObjectArray<mirror::ArtMethod>* directs = 2106 AllocArtMethodArray(self, it.NumDirectMethods()); 2107 if (UNLIKELY(directs == NULL)) { 2108 CHECK(self->IsExceptionPending()); // OOME. 2109 return; 2110 } 2111 klass->SetDirectMethods(directs); 2112 } 2113 if (it.NumVirtualMethods() != 0) { 2114 // TODO: append direct methods to class object 2115 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2116 AllocArtMethodArray(self, it.NumVirtualMethods()); 2117 if (UNLIKELY(virtuals == NULL)) { 2118 CHECK(self->IsExceptionPending()); // OOME. 2119 return; 2120 } 2121 klass->SetVirtualMethods(virtuals); 2122 } 2123 size_t class_def_method_index = 0; 2124 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2125 StackHandleScope<1> hs(self); 2126 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2127 if (UNLIKELY(method.Get() == NULL)) { 2128 CHECK(self->IsExceptionPending()); // OOME. 2129 return; 2130 } 2131 klass->SetDirectMethod(i, method.Get()); 2132 if (oat_class != nullptr) { 2133 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2134 } 2135 method->SetMethodIndex(class_def_method_index); 2136 class_def_method_index++; 2137 } 2138 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2139 StackHandleScope<1> hs(self); 2140 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2141 if (UNLIKELY(method.Get() == NULL)) { 2142 CHECK(self->IsExceptionPending()); // OOME. 2143 return; 2144 } 2145 klass->SetVirtualMethod(i, method.Get()); 2146 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2147 if (oat_class != nullptr) { 2148 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2149 } 2150 class_def_method_index++; 2151 } 2152 DCHECK(!it.HasNext()); 2153} 2154 2155void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2156 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2157 uint32_t field_idx = it.GetMemberIndex(); 2158 dst->SetDexFieldIndex(field_idx); 2159 dst->SetDeclaringClass(klass.Get()); 2160 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2161} 2162 2163mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2164 const ClassDataItemIterator& it, 2165 Handle<mirror::Class> klass) { 2166 uint32_t dex_method_idx = it.GetMemberIndex(); 2167 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2168 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2169 2170 mirror::ArtMethod* dst = AllocArtMethod(self); 2171 if (UNLIKELY(dst == NULL)) { 2172 CHECK(self->IsExceptionPending()); // OOME. 2173 return NULL; 2174 } 2175 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2176 2177 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2178 dst->SetDexMethodIndex(dex_method_idx); 2179 dst->SetDeclaringClass(klass.Get()); 2180 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2181 2182 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2183 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2184 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2185 2186 uint32_t access_flags = it.GetMemberAccessFlags(); 2187 2188 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2189 // Set finalizable flag on declaring class. 2190 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2191 // Void return type. 2192 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 2193 klass->SetFinalizable(); 2194 } else { 2195 std::string klass_descriptor = klass->GetDescriptor(); 2196 // The Enum class declares a "final" finalize() method to prevent subclasses from 2197 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2198 // subclasses, so we exclude it here. 2199 // We also want to avoid setting the flag on Object, where we know that finalize() is 2200 // empty. 2201 if (klass_descriptor.compare("Ljava/lang/Object;") != 0 && 2202 klass_descriptor.compare("Ljava/lang/Enum;") != 0) { 2203 klass->SetFinalizable(); 2204 } 2205 } 2206 } 2207 } else if (method_name[0] == '<') { 2208 // Fix broken access flags for initializers. Bug 11157540. 2209 bool is_init = (strcmp("<init>", method_name) == 0); 2210 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2211 if (UNLIKELY(!is_init && !is_clinit)) { 2212 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2213 } else { 2214 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2215 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2216 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2217 access_flags |= kAccConstructor; 2218 } 2219 } 2220 } 2221 dst->SetAccessFlags(access_flags); 2222 2223 self->EndAssertNoThreadSuspension(old_cause); 2224 return dst; 2225} 2226 2227void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2228 Thread* self = Thread::Current(); 2229 StackHandleScope<1> hs(self); 2230 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2231 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2232 AppendToBootClassPath(dex_file, dex_cache); 2233} 2234 2235void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2236 Handle<mirror::DexCache> dex_cache) { 2237 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2238 boot_class_path_.push_back(&dex_file); 2239 RegisterDexFile(dex_file, dex_cache); 2240} 2241 2242bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2243 dex_lock_.AssertSharedHeld(Thread::Current()); 2244 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2245 mirror::DexCache* dex_cache = GetDexCache(i); 2246 if (dex_cache->GetDexFile() == &dex_file) { 2247 return true; 2248 } 2249 } 2250 return false; 2251} 2252 2253bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2254 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2255 return IsDexFileRegisteredLocked(dex_file); 2256} 2257 2258void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2259 Handle<mirror::DexCache> dex_cache) { 2260 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2261 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2262 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2263 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2264 dex_caches_.push_back(dex_cache.Get()); 2265 dex_cache->SetDexFile(&dex_file); 2266 if (log_new_dex_caches_roots_) { 2267 // TODO: This is not safe if we can remove dex caches. 2268 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2269 } 2270} 2271 2272void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2273 Thread* self = Thread::Current(); 2274 { 2275 ReaderMutexLock mu(self, dex_lock_); 2276 if (IsDexFileRegisteredLocked(dex_file)) { 2277 return; 2278 } 2279 } 2280 // Don't alloc while holding the lock, since allocation may need to 2281 // suspend all threads and another thread may need the dex_lock_ to 2282 // get to a suspend point. 2283 StackHandleScope<1> hs(self); 2284 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2285 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2286 { 2287 WriterMutexLock mu(self, dex_lock_); 2288 if (IsDexFileRegisteredLocked(dex_file)) { 2289 return; 2290 } 2291 RegisterDexFileLocked(dex_file, dex_cache); 2292 } 2293} 2294 2295void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2296 Handle<mirror::DexCache> dex_cache) { 2297 WriterMutexLock mu(Thread::Current(), dex_lock_); 2298 RegisterDexFileLocked(dex_file, dex_cache); 2299} 2300 2301mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2302 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2303 // Search assuming unique-ness of dex file. 2304 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2305 mirror::DexCache* dex_cache = GetDexCache(i); 2306 if (dex_cache->GetDexFile() == &dex_file) { 2307 return dex_cache; 2308 } 2309 } 2310 // Search matching by location name. 2311 std::string location(dex_file.GetLocation()); 2312 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2313 mirror::DexCache* dex_cache = GetDexCache(i); 2314 if (dex_cache->GetDexFile()->GetLocation() == location) { 2315 return dex_cache; 2316 } 2317 } 2318 // Failure, dump diagnostic and abort. 2319 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2320 mirror::DexCache* dex_cache = GetDexCache(i); 2321 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2322 } 2323 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2324 return NULL; 2325} 2326 2327void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2328 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2329 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2330 mirror::DexCache* dex_cache = GetDexCache(i); 2331 dex_cache->Fixup(resolution_method); 2332 } 2333} 2334 2335mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2336 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 2337 if (UNLIKELY(klass == NULL)) { 2338 return NULL; 2339 } 2340 return InitializePrimitiveClass(klass, type); 2341} 2342 2343mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2344 Primitive::Type type) { 2345 CHECK(primitive_class != NULL); 2346 // Must hold lock on object when initializing. 2347 Thread* self = Thread::Current(); 2348 StackHandleScope<1> hs(self); 2349 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2350 ObjectLock<mirror::Class> lock(self, h_class); 2351 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2352 primitive_class->SetPrimitiveType(type); 2353 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2354 const char* descriptor = Primitive::Descriptor(type); 2355 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2356 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2357 return primitive_class; 2358} 2359 2360// Create an array class (i.e. the class object for the array, not the 2361// array itself). "descriptor" looks like "[C" or "[[[[B" or 2362// "[Ljava/lang/String;". 2363// 2364// If "descriptor" refers to an array of primitives, look up the 2365// primitive type's internally-generated class object. 2366// 2367// "class_loader" is the class loader of the class that's referring to 2368// us. It's used to ensure that we're looking for the element type in 2369// the right context. It does NOT become the class loader for the 2370// array class; that always comes from the base element class. 2371// 2372// Returns NULL with an exception raised on failure. 2373mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2374 Handle<mirror::ClassLoader> class_loader) { 2375 // Identify the underlying component type 2376 CHECK_EQ('[', descriptor[0]); 2377 StackHandleScope<2> hs(self); 2378 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2379 if (component_type.Get() == nullptr) { 2380 DCHECK(self->IsExceptionPending()); 2381 return nullptr; 2382 } 2383 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2384 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2385 return nullptr; 2386 } 2387 // See if the component type is already loaded. Array classes are 2388 // always associated with the class loader of their underlying 2389 // element type -- an array of Strings goes with the loader for 2390 // java/lang/String -- so we need to look for it there. (The 2391 // caller should have checked for the existence of the class 2392 // before calling here, but they did so with *their* class loader, 2393 // not the component type's loader.) 2394 // 2395 // If we find it, the caller adds "loader" to the class' initiating 2396 // loader list, which should prevent us from going through this again. 2397 // 2398 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2399 // are the same, because our caller (FindClass) just did the 2400 // lookup. (Even if we get this wrong we still have correct behavior, 2401 // because we effectively do this lookup again when we add the new 2402 // class to the hash table --- necessary because of possible races with 2403 // other threads.) 2404 if (class_loader.Get() != component_type->GetClassLoader()) { 2405 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2406 if (new_class != NULL) { 2407 return new_class; 2408 } 2409 } 2410 2411 // Fill out the fields in the Class. 2412 // 2413 // It is possible to execute some methods against arrays, because 2414 // all arrays are subclasses of java_lang_Object_, so we need to set 2415 // up a vtable. We can just point at the one in java_lang_Object_. 2416 // 2417 // Array classes are simple enough that we don't need to do a full 2418 // link step. 2419 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2420 if (UNLIKELY(!init_done_)) { 2421 // Classes that were hand created, ie not by FindSystemClass 2422 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2423 new_class.Assign(GetClassRoot(kClassArrayClass)); 2424 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2425 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2426 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2427 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2428 } else if (strcmp(descriptor, 2429 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2430 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2431 } else if (strcmp(descriptor, 2432 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2433 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2434 } else if (strcmp(descriptor, "[C") == 0) { 2435 new_class.Assign(GetClassRoot(kCharArrayClass)); 2436 } else if (strcmp(descriptor, "[I") == 0) { 2437 new_class.Assign(GetClassRoot(kIntArrayClass)); 2438 } 2439 } 2440 if (new_class.Get() == nullptr) { 2441 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 2442 if (new_class.Get() == nullptr) { 2443 return nullptr; 2444 } 2445 new_class->SetComponentType(component_type.Get()); 2446 } 2447 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2448 DCHECK(new_class->GetComponentType() != NULL); 2449 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2450 new_class->SetSuperClass(java_lang_Object); 2451 new_class->SetVTable(java_lang_Object->GetVTable()); 2452 new_class->SetPrimitiveType(Primitive::kPrimNot); 2453 new_class->SetClassLoader(component_type->GetClassLoader()); 2454 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 2455 new_class->PopulateEmbeddedImtAndVTable(); 2456 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2457 // don't need to set new_class->SetObjectSize(..) 2458 // because Object::SizeOf delegates to Array::SizeOf 2459 2460 2461 // All arrays have java/lang/Cloneable and java/io/Serializable as 2462 // interfaces. We need to set that up here, so that stuff like 2463 // "instanceof" works right. 2464 // 2465 // Note: The GC could run during the call to FindSystemClass, 2466 // so we need to make sure the class object is GC-valid while we're in 2467 // there. Do this by clearing the interface list so the GC will just 2468 // think that the entries are null. 2469 2470 2471 // Use the single, global copies of "interfaces" and "iftable" 2472 // (remember not to free them for arrays). 2473 { 2474 mirror::IfTable* array_iftable = 2475 ReadBarrier::BarrierForRoot<mirror::IfTable, kWithReadBarrier>(&array_iftable_); 2476 CHECK(array_iftable != nullptr); 2477 new_class->SetIfTable(array_iftable); 2478 } 2479 2480 // Inherit access flags from the component type. 2481 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2482 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2483 access_flags &= kAccJavaFlagsMask; 2484 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2485 // and remove "interface". 2486 access_flags |= kAccAbstract | kAccFinal; 2487 access_flags &= ~kAccInterface; 2488 2489 new_class->SetAccessFlags(access_flags); 2490 2491 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2492 if (existing == nullptr) { 2493 return new_class.Get(); 2494 } 2495 // Another thread must have loaded the class after we 2496 // started but before we finished. Abandon what we've 2497 // done. 2498 // 2499 // (Yes, this happens.) 2500 2501 return existing; 2502} 2503 2504mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2505 switch (type) { 2506 case 'B': 2507 return GetClassRoot(kPrimitiveByte); 2508 case 'C': 2509 return GetClassRoot(kPrimitiveChar); 2510 case 'D': 2511 return GetClassRoot(kPrimitiveDouble); 2512 case 'F': 2513 return GetClassRoot(kPrimitiveFloat); 2514 case 'I': 2515 return GetClassRoot(kPrimitiveInt); 2516 case 'J': 2517 return GetClassRoot(kPrimitiveLong); 2518 case 'S': 2519 return GetClassRoot(kPrimitiveShort); 2520 case 'Z': 2521 return GetClassRoot(kPrimitiveBoolean); 2522 case 'V': 2523 return GetClassRoot(kPrimitiveVoid); 2524 default: 2525 break; 2526 } 2527 std::string printable_type(PrintableChar(type)); 2528 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2529 return NULL; 2530} 2531 2532mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2533 size_t hash) { 2534 if (VLOG_IS_ON(class_linker)) { 2535 mirror::DexCache* dex_cache = klass->GetDexCache(); 2536 std::string source; 2537 if (dex_cache != NULL) { 2538 source += " from "; 2539 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2540 } 2541 LOG(INFO) << "Loaded class " << descriptor << source; 2542 } 2543 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2544 mirror::Class* existing = 2545 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2546 if (existing != NULL) { 2547 return existing; 2548 } 2549 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == NULL && 2550 dex_cache_image_class_lookup_required_) { 2551 // Check a class loaded with the system class loader matches one in the image if the class 2552 // is in the image. 2553 existing = LookupClassFromImage(descriptor); 2554 if (existing != NULL) { 2555 CHECK(klass == existing); 2556 } 2557 } 2558 VerifyObject(klass); 2559 class_table_.insert(std::make_pair(hash, klass)); 2560 if (log_new_class_table_roots_) { 2561 new_class_roots_.push_back(std::make_pair(hash, klass)); 2562 } 2563 return NULL; 2564} 2565 2566mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 2567 size_t hash) { 2568 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2569 mirror::Class* existing = 2570 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2571 2572 if (existing == nullptr) { 2573 CHECK(klass->IsProxyClass()); 2574 return nullptr; 2575 } 2576 2577 CHECK_NE(existing, klass) << descriptor; 2578 CHECK(!existing->IsResolved()) << descriptor; 2579 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 2580 2581 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2582 ++it) { 2583 mirror::Class* entry = it->second; 2584 if (entry == existing) { 2585 class_table_.erase(it); 2586 break; 2587 } 2588 } 2589 2590 CHECK(!klass->IsTemp()) << descriptor; 2591 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 2592 dex_cache_image_class_lookup_required_) { 2593 // Check a class loaded with the system class loader matches one in the image if the class 2594 // is in the image. 2595 existing = LookupClassFromImage(descriptor); 2596 if (existing != nullptr) { 2597 CHECK(klass == existing) << descriptor; 2598 } 2599 } 2600 VerifyObject(klass); 2601 2602 class_table_.insert(std::make_pair(hash, klass)); 2603 if (log_new_class_table_roots_) { 2604 new_class_roots_.push_back(std::make_pair(hash, klass)); 2605 } 2606 2607 return existing; 2608} 2609 2610bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2611 size_t hash = Hash(descriptor); 2612 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2613 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2614 it != end && it->first == hash; 2615 ++it) { 2616 mirror::Class** root = &it->second; 2617 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2618 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2619 class_table_.erase(it); 2620 return true; 2621 } 2622 } 2623 return false; 2624} 2625 2626mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2627 const mirror::ClassLoader* class_loader) { 2628 size_t hash = Hash(descriptor); 2629 { 2630 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2631 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2632 if (result != NULL) { 2633 return result; 2634 } 2635 } 2636 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2637 return NULL; 2638 } else { 2639 // Lookup failed but need to search dex_caches_. 2640 mirror::Class* result = LookupClassFromImage(descriptor); 2641 if (result != NULL) { 2642 InsertClass(descriptor, result, hash); 2643 } else { 2644 // Searching the image dex files/caches failed, we don't want to get into this situation 2645 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2646 // classes into the class table. 2647 const int32_t kMaxFailedDexCacheLookups = 1000; 2648 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2649 MoveImageClassesToClassTable(); 2650 } 2651 } 2652 return result; 2653 } 2654} 2655 2656mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2657 const mirror::ClassLoader* class_loader, 2658 size_t hash) { 2659 auto end = class_table_.end(); 2660 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2661 mirror::Class** root = &it->second; 2662 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2663 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2664 if (kIsDebugBuild) { 2665 // Check for duplicates in the table. 2666 for (++it; it != end && it->first == hash; ++it) { 2667 mirror::Class** root2 = &it->second; 2668 mirror::Class* klass2 = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root2); 2669 CHECK(!(klass2->GetClassLoader() == class_loader && 2670 klass2->DescriptorEquals(descriptor))) 2671 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2672 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2673 } 2674 } 2675 return klass; 2676 } 2677 } 2678 return NULL; 2679} 2680 2681static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2682 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2683 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2684 CHECK(image != NULL); 2685 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2686 return root->AsObjectArray<mirror::DexCache>(); 2687} 2688 2689void ClassLinker::MoveImageClassesToClassTable() { 2690 Thread* self = Thread::Current(); 2691 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2692 if (!dex_cache_image_class_lookup_required_) { 2693 return; // All dex cache classes are already in the class table. 2694 } 2695 const char* old_no_suspend_cause = 2696 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2697 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2698 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2699 mirror::DexCache* dex_cache = dex_caches->Get(i); 2700 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2701 for (int32_t j = 0; j < types->GetLength(); j++) { 2702 mirror::Class* klass = types->Get(j); 2703 if (klass != NULL) { 2704 DCHECK(klass->GetClassLoader() == NULL); 2705 std::string descriptor = klass->GetDescriptor(); 2706 size_t hash = Hash(descriptor.c_str()); 2707 mirror::Class* existing = LookupClassFromTableLocked(descriptor.c_str(), NULL, hash); 2708 if (existing != NULL) { 2709 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2710 << PrettyClassAndClassLoader(klass); 2711 } else { 2712 class_table_.insert(std::make_pair(hash, klass)); 2713 if (log_new_class_table_roots_) { 2714 new_class_roots_.push_back(std::make_pair(hash, klass)); 2715 } 2716 } 2717 } 2718 } 2719 } 2720 dex_cache_image_class_lookup_required_ = false; 2721 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2722} 2723 2724mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2725 Thread* self = Thread::Current(); 2726 const char* old_no_suspend_cause = 2727 self->StartAssertNoThreadSuspension("Image class lookup"); 2728 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2729 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2730 mirror::DexCache* dex_cache = dex_caches->Get(i); 2731 const DexFile* dex_file = dex_cache->GetDexFile(); 2732 // Try binary searching the string/type index. 2733 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2734 if (string_id != NULL) { 2735 const DexFile::TypeId* type_id = 2736 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2737 if (type_id != NULL) { 2738 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2739 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2740 if (klass != NULL) { 2741 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2742 return klass; 2743 } 2744 } 2745 } 2746 } 2747 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2748 return NULL; 2749} 2750 2751void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2752 result.clear(); 2753 if (dex_cache_image_class_lookup_required_) { 2754 MoveImageClassesToClassTable(); 2755 } 2756 size_t hash = Hash(descriptor); 2757 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2758 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2759 it != end && it->first == hash; ++it) { 2760 mirror::Class** root = &it->second; 2761 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2762 if (klass->DescriptorEquals(descriptor)) { 2763 result.push_back(klass); 2764 } 2765 } 2766} 2767 2768void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 2769 // TODO: assert that the monitor on the Class is held 2770 Thread* self = Thread::Current(); 2771 ObjectLock<mirror::Class> lock(self, klass); 2772 2773 // Don't attempt to re-verify if already sufficiently verified. 2774 if (klass->IsVerified() || 2775 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2776 return; 2777 } 2778 2779 // The class might already be erroneous, for example at compile time if we attempted to verify 2780 // this class as a parent to another. 2781 if (klass->IsErroneous()) { 2782 ThrowEarlierClassFailure(klass.Get()); 2783 return; 2784 } 2785 2786 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2787 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2788 } else { 2789 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2790 << PrettyClass(klass.Get()); 2791 CHECK(!Runtime::Current()->IsCompiler()); 2792 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2793 } 2794 2795 // Skip verification if disabled. 2796 if (!Runtime::Current()->IsVerificationEnabled()) { 2797 klass->SetStatus(mirror::Class::kStatusVerified, self); 2798 return; 2799 } 2800 2801 // Verify super class. 2802 StackHandleScope<2> hs(self); 2803 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 2804 if (super.Get() != NULL) { 2805 // Acquire lock to prevent races on verifying the super class. 2806 ObjectLock<mirror::Class> lock(self, super); 2807 2808 if (!super->IsVerified() && !super->IsErroneous()) { 2809 VerifyClass(super); 2810 } 2811 if (!super->IsCompileTimeVerified()) { 2812 std::string error_msg( 2813 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2814 PrettyDescriptor(klass.Get()).c_str(), 2815 PrettyDescriptor(super.Get()).c_str())); 2816 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2817 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 2818 if (cause.Get() != nullptr) { 2819 self->ClearException(); 2820 } 2821 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2822 if (cause.Get() != nullptr) { 2823 self->GetException(nullptr)->SetCause(cause.Get()); 2824 } 2825 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2826 if (Runtime::Current()->IsCompiler()) { 2827 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2828 } 2829 klass->SetStatus(mirror::Class::kStatusError, self); 2830 return; 2831 } 2832 } 2833 2834 // Try to use verification information from the oat file, otherwise do runtime verification. 2835 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2836 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2837 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 2838 if (oat_file_class_status == mirror::Class::kStatusError) { 2839 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2840 << PrettyDescriptor(klass.Get()) << " in " 2841 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2842 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 2843 PrettyDescriptor(klass.Get()).c_str()); 2844 klass->SetStatus(mirror::Class::kStatusError, self); 2845 return; 2846 } 2847 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2848 std::string error_msg; 2849 if (!preverified) { 2850 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 2851 Runtime::Current()->IsCompiler(), 2852 &error_msg); 2853 } 2854 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2855 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2856 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 2857 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2858 << " because: " << error_msg; 2859 } 2860 self->AssertNoPendingException(); 2861 // Make sure all classes referenced by catch blocks are resolved. 2862 ResolveClassExceptionHandlerTypes(dex_file, klass); 2863 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2864 // Even though there were no verifier failures we need to respect whether the super-class 2865 // was verified or requiring runtime reverification. 2866 if (super.Get() == NULL || super->IsVerified()) { 2867 klass->SetStatus(mirror::Class::kStatusVerified, self); 2868 } else { 2869 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2870 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2871 // Pretend a soft failure occured so that we don't consider the class verified below. 2872 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2873 } 2874 } else { 2875 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2876 // Soft failures at compile time should be retried at runtime. Soft 2877 // failures at runtime will be handled by slow paths in the generated 2878 // code. Set status accordingly. 2879 if (Runtime::Current()->IsCompiler()) { 2880 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2881 } else { 2882 klass->SetStatus(mirror::Class::kStatusVerified, self); 2883 } 2884 } 2885 } else { 2886 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 2887 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2888 << " because: " << error_msg; 2889 self->AssertNoPendingException(); 2890 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2891 klass->SetStatus(mirror::Class::kStatusError, self); 2892 } 2893 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2894 // Class is verified so we don't need to do any access check on its methods. 2895 // Let the interpreter know it by setting the kAccPreverified flag onto each 2896 // method. 2897 // Note: we're going here during compilation and at runtime. When we set the 2898 // kAccPreverified flag when compiling image classes, the flag is recorded 2899 // in the image and is set when loading the image. 2900 klass->SetPreverifiedFlagOnAllMethods(); 2901 } 2902} 2903 2904bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2905 mirror::Class::Status& oat_file_class_status) { 2906 // If we're compiling, we can only verify the class using the oat file if 2907 // we are not compiling the image or if the class we're verifying is not part of 2908 // the app. In other words, we will only check for preverification of bootclasspath 2909 // classes. 2910 if (Runtime::Current()->IsCompiler()) { 2911 // Are we compiling the bootclasspath? 2912 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2913 return false; 2914 } 2915 // We are compiling an app (not the image). 2916 2917 // Is this an app class? (I.e. not a bootclasspath class) 2918 if (klass->GetClassLoader() != NULL) { 2919 return false; 2920 } 2921 } 2922 2923 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2924 // Make this work with gtests, which do not set up the image properly. 2925 // TODO: we should clean up gtests to set up the image path properly. 2926 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2927 return false; 2928 } 2929 2930 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2931 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2932 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2933 &dex_location_checksum); 2934 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2935 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2936 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 2937 if (oat_file_class_status == mirror::Class::kStatusVerified || 2938 oat_file_class_status == mirror::Class::kStatusInitialized) { 2939 return true; 2940 } 2941 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2942 // Compile time verification failed with a soft error. Compile time verification can fail 2943 // because we have incomplete type information. Consider the following: 2944 // class ... { 2945 // Foo x; 2946 // .... () { 2947 // if (...) { 2948 // v1 gets assigned a type of resolved class Foo 2949 // } else { 2950 // v1 gets assigned a type of unresolved class Bar 2951 // } 2952 // iput x = v1 2953 // } } 2954 // when we merge v1 following the if-the-else it results in Conflict 2955 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2956 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2957 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2958 // at compile time). 2959 return false; 2960 } 2961 if (oat_file_class_status == mirror::Class::kStatusError) { 2962 // Compile time verification failed with a hard error. This is caused by invalid instructions 2963 // in the class. These errors are unrecoverable. 2964 return false; 2965 } 2966 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2967 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2968 // not loading the class. 2969 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2970 // isn't a problem and this case shouldn't occur 2971 return false; 2972 } 2973 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2974 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2975 << klass->GetDescriptor(); 2976 2977 return false; 2978} 2979 2980void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2981 Handle<mirror::Class> klass) { 2982 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2983 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2984 } 2985 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2986 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2987 } 2988} 2989 2990void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2991 mirror::ArtMethod* method) { 2992 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2993 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2994 if (code_item == NULL) { 2995 return; // native or abstract method 2996 } 2997 if (code_item->tries_size_ == 0) { 2998 return; // nothing to process 2999 } 3000 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3001 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3002 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3003 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3004 CatchHandlerIterator iterator(handlers_ptr); 3005 for (; iterator.HasNext(); iterator.Next()) { 3006 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3007 // unresolved exception types will be ignored by exception delivery 3008 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3009 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3010 if (exception_type == NULL) { 3011 DCHECK(Thread::Current()->IsExceptionPending()); 3012 Thread::Current()->ClearException(); 3013 } 3014 } 3015 } 3016 handlers_ptr = iterator.EndDataPointer(); 3017 } 3018} 3019 3020static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3021static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3022 Handle<mirror::ArtMethod> prototype); 3023 3024mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3025 jobjectArray interfaces, jobject loader, 3026 jobjectArray methods, jobjectArray throws) { 3027 Thread* self = soa.Self(); 3028 StackHandleScope<8> hs(self); 3029 Handle<mirror::Class> klass(hs.NewHandle( 3030 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3031 if (klass.Get() == NULL) { 3032 CHECK(self->IsExceptionPending()); // OOME. 3033 return NULL; 3034 } 3035 DCHECK(klass->GetClass() != NULL); 3036 klass->SetObjectSize(sizeof(mirror::Proxy)); 3037 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 3038 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3039 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3040 klass->SetName(soa.Decode<mirror::String*>(name)); 3041 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3042 klass->SetDexCache(proxy_class->GetDexCache()); 3043 klass->SetStatus(mirror::Class::kStatusIdx, self); 3044 3045 // Instance fields are inherited, but we add a couple of static fields... 3046 { 3047 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3048 if (UNLIKELY(sfields == NULL)) { 3049 CHECK(self->IsExceptionPending()); // OOME. 3050 return NULL; 3051 } 3052 klass->SetSFields(sfields); 3053 } 3054 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3055 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3056 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3057 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3058 CHECK(self->IsExceptionPending()); // OOME. 3059 return nullptr; 3060 } 3061 klass->SetStaticField(0, interfaces_sfield.Get()); 3062 interfaces_sfield->SetDexFieldIndex(0); 3063 interfaces_sfield->SetDeclaringClass(klass.Get()); 3064 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3065 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3066 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3067 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3068 CHECK(self->IsExceptionPending()); // OOME. 3069 return nullptr; 3070 } 3071 klass->SetStaticField(1, throws_sfield.Get()); 3072 throws_sfield->SetDexFieldIndex(1); 3073 throws_sfield->SetDeclaringClass(klass.Get()); 3074 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3075 3076 // Proxies have 1 direct method, the constructor 3077 { 3078 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3079 if (UNLIKELY(directs == nullptr)) { 3080 CHECK(self->IsExceptionPending()); // OOME. 3081 return nullptr; 3082 } 3083 klass->SetDirectMethods(directs); 3084 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3085 if (UNLIKELY(constructor == nullptr)) { 3086 CHECK(self->IsExceptionPending()); // OOME. 3087 return nullptr; 3088 } 3089 klass->SetDirectMethod(0, constructor); 3090 } 3091 3092 // Create virtual method using specified prototypes. 3093 size_t num_virtual_methods = 3094 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3095 { 3096 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3097 num_virtual_methods); 3098 if (UNLIKELY(virtuals == NULL)) { 3099 CHECK(self->IsExceptionPending()); // OOME. 3100 return NULL; 3101 } 3102 klass->SetVirtualMethods(virtuals); 3103 } 3104 for (size_t i = 0; i < num_virtual_methods; ++i) { 3105 StackHandleScope<1> hs(self); 3106 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3107 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3108 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3109 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3110 if (UNLIKELY(clone == nullptr)) { 3111 CHECK(self->IsExceptionPending()); // OOME. 3112 return nullptr; 3113 } 3114 klass->SetVirtualMethod(i, clone); 3115 } 3116 3117 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3118 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3119 self->AssertNoPendingException(); 3120 3121 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3122 mirror::Class* new_class = nullptr; 3123 { 3124 ObjectLock<mirror::Class> resolution_lock(self, klass); // Must hold lock on object when resolved. 3125 // Link the fields and virtual methods, creating vtable and iftables 3126 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3127 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3128 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3129 klass->SetStatus(mirror::Class::kStatusError, self); 3130 return nullptr; 3131 } 3132 } 3133 3134 CHECK(klass->IsRetired()); 3135 CHECK_NE(klass.Get(), new_class); 3136 klass.Assign(new_class); 3137 3138 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3139 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3140 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3141 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3142 3143 { 3144 // Lock on klass is released. Lock new class object. 3145 ObjectLock<mirror::Class> initialization_lock(self, klass); 3146 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3147 } 3148 3149 // sanity checks 3150 if (kIsDebugBuild) { 3151 CHECK(klass->GetIFields() == nullptr); 3152 CheckProxyConstructor(klass->GetDirectMethod(0)); 3153 for (size_t i = 0; i < num_virtual_methods; ++i) { 3154 StackHandleScope<2> hs(self); 3155 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3156 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3157 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3158 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3159 CheckProxyMethod(virtual_method, prototype); 3160 } 3161 3162 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3163 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3164 decoded_name->ToModifiedUtf8().c_str())); 3165 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3166 3167 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3168 decoded_name->ToModifiedUtf8().c_str())); 3169 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3170 3171 CHECK_EQ(klass.Get()->GetInterfaces(), 3172 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3173 CHECK_EQ(klass.Get()->GetThrows(), 3174 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3175 } 3176 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3177 CHECK(existing == nullptr); 3178 return klass.Get(); 3179} 3180 3181std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3182 DCHECK(proxy_class->IsProxyClass()); 3183 mirror::String* name = proxy_class->GetName(); 3184 DCHECK(name != NULL); 3185 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3186} 3187 3188mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3189 mirror::ArtMethod* proxy_method) { 3190 DCHECK(proxy_class->IsProxyClass()); 3191 DCHECK(proxy_method->IsProxyMethod()); 3192 // Locate the dex cache of the original interface/Object 3193 mirror::DexCache* dex_cache = NULL; 3194 { 3195 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 3196 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3197 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3198 mirror::DexCache* a_dex_cache = GetDexCache(i); 3199 if (a_dex_cache->GetResolvedTypes() == resolved_types) { 3200 dex_cache = a_dex_cache; 3201 break; 3202 } 3203 } 3204 } 3205 CHECK(dex_cache != NULL); 3206 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3207 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3208 CHECK(resolved_method != NULL); 3209 return resolved_method; 3210} 3211 3212 3213mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3214 Handle<mirror::Class> klass, 3215 mirror::Class* proxy_class) { 3216 // Create constructor for Proxy that must initialize h 3217 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3218 proxy_class->GetDirectMethods(); 3219 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3220 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3221 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3222 // code_ too) 3223 mirror::ArtMethod* constructor = 3224 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3225 if (constructor == NULL) { 3226 CHECK(self->IsExceptionPending()); // OOME. 3227 return NULL; 3228 } 3229 // Make this constructor public and fix the class to be our Proxy version 3230 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3231 constructor->SetDeclaringClass(klass.Get()); 3232 return constructor; 3233} 3234 3235static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3236 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3237 CHECK(constructor->IsConstructor()); 3238 CHECK_STREQ(constructor->GetName(), "<init>"); 3239 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3240 "(Ljava/lang/reflect/InvocationHandler;)V"); 3241 DCHECK(constructor->IsPublic()); 3242} 3243 3244mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3245 Handle<mirror::Class> klass, 3246 Handle<mirror::ArtMethod> prototype) { 3247 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3248 // prototype method 3249 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3250 prototype.Get()); 3251 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3252 // as necessary 3253 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3254 if (UNLIKELY(method == NULL)) { 3255 CHECK(self->IsExceptionPending()); // OOME. 3256 return NULL; 3257 } 3258 3259 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3260 // the intersection of throw exceptions as defined in Proxy 3261 method->SetDeclaringClass(klass.Get()); 3262 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3263 3264 // At runtime the method looks like a reference and argument saving method, clone the code 3265 // related parameters from this method. 3266 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3267 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3268 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3269 3270 return method; 3271} 3272 3273static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3274 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3275 // Basic sanity 3276 CHECK(!prototype->IsFinal()); 3277 CHECK(method->IsFinal()); 3278 CHECK(!method->IsAbstract()); 3279 3280 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3281 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3282 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3283 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 3284 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 3285 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3286 3287 MethodHelper mh(method); 3288 MethodHelper mh2(prototype); 3289 CHECK_STREQ(method->GetName(), prototype->GetName()); 3290 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3291 // More complex sanity - via dex cache 3292 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3293} 3294 3295static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3296 bool can_init_parents) 3297 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3298 if (can_init_statics && can_init_parents) { 3299 return true; 3300 } 3301 if (!can_init_statics) { 3302 // Check if there's a class initializer. 3303 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3304 if (clinit != NULL) { 3305 return false; 3306 } 3307 // Check if there are encoded static values needing initialization. 3308 if (klass->NumStaticFields() != 0) { 3309 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3310 DCHECK(dex_class_def != NULL); 3311 if (dex_class_def->static_values_off_ != 0) { 3312 return false; 3313 } 3314 } 3315 } 3316 if (!klass->IsInterface() && klass->HasSuperClass()) { 3317 mirror::Class* super_class = klass->GetSuperClass(); 3318 if (!can_init_parents && !super_class->IsInitialized()) { 3319 return false; 3320 } else { 3321 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3322 return false; 3323 } 3324 } 3325 } 3326 return true; 3327} 3328 3329bool ClassLinker::IsInitialized() const { 3330 return init_done_; 3331} 3332 3333bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3334 bool can_init_parents) { 3335 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3336 3337 // Are we already initialized and therefore done? 3338 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3339 // an initialized class will never change its state. 3340 if (klass->IsInitialized()) { 3341 return true; 3342 } 3343 3344 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3345 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3346 return false; 3347 } 3348 3349 Thread* self = Thread::Current(); 3350 uint64_t t0; 3351 { 3352 ObjectLock<mirror::Class> lock(self, klass); 3353 3354 // Re-check under the lock in case another thread initialized ahead of us. 3355 if (klass->IsInitialized()) { 3356 return true; 3357 } 3358 3359 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3360 if (klass->IsErroneous()) { 3361 ThrowEarlierClassFailure(klass.Get()); 3362 return false; 3363 } 3364 3365 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3366 3367 if (!klass->IsVerified()) { 3368 VerifyClass(klass); 3369 if (!klass->IsVerified()) { 3370 // We failed to verify, expect either the klass to be erroneous or verification failed at 3371 // compile time. 3372 if (klass->IsErroneous()) { 3373 CHECK(self->IsExceptionPending()); 3374 } else { 3375 CHECK(Runtime::Current()->IsCompiler()); 3376 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3377 } 3378 return false; 3379 } 3380 } 3381 3382 // If the class is kStatusInitializing, either this thread is 3383 // initializing higher up the stack or another thread has beat us 3384 // to initializing and we need to wait. Either way, this 3385 // invocation of InitializeClass will not be responsible for 3386 // running <clinit> and will return. 3387 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3388 // We caught somebody else in the act; was it us? 3389 if (klass->GetClinitThreadId() == self->GetTid()) { 3390 // Yes. That's fine. Return so we can continue initializing. 3391 return true; 3392 } 3393 // No. That's fine. Wait for another thread to finish initializing. 3394 return WaitForInitializeClass(klass, self, lock); 3395 } 3396 3397 if (!ValidateSuperClassDescriptors(klass)) { 3398 klass->SetStatus(mirror::Class::kStatusError, self); 3399 return false; 3400 } 3401 3402 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3403 3404 // From here out other threads may observe that we're initializing and so changes of state 3405 // require the a notification. 3406 klass->SetClinitThreadId(self->GetTid()); 3407 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3408 3409 t0 = NanoTime(); 3410 } 3411 3412 // Initialize super classes, must be done while initializing for the JLS. 3413 if (!klass->IsInterface() && klass->HasSuperClass()) { 3414 mirror::Class* super_class = klass->GetSuperClass(); 3415 if (!super_class->IsInitialized()) { 3416 CHECK(!super_class->IsInterface()); 3417 CHECK(can_init_parents); 3418 StackHandleScope<1> hs(self); 3419 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3420 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3421 if (!super_initialized) { 3422 // The super class was verified ahead of entering initializing, we should only be here if 3423 // the super class became erroneous due to initialization. 3424 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3425 << "Super class initialization failed for " 3426 << PrettyDescriptor(handle_scope_super.Get()) 3427 << " that has unexpected status " << handle_scope_super->GetStatus() 3428 << "\nPending exception:\n" 3429 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3430 ObjectLock<mirror::Class> lock(self, klass); 3431 // Initialization failed because the super-class is erroneous. 3432 klass->SetStatus(mirror::Class::kStatusError, self); 3433 return false; 3434 } 3435 } 3436 } 3437 3438 if (klass->NumStaticFields() > 0) { 3439 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3440 CHECK(dex_class_def != NULL); 3441 const DexFile& dex_file = klass->GetDexFile(); 3442 StackHandleScope<2> hs(self); 3443 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3444 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3445 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3446 this, *dex_class_def); 3447 if (it.HasNext()) { 3448 CHECK(can_init_statics); 3449 // We reordered the fields, so we need to be able to map the 3450 // field indexes to the right fields. 3451 SafeMap<uint32_t, mirror::ArtField*> field_map; 3452 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3453 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3454 if (Runtime::Current()->IsActiveTransaction()) { 3455 it.ReadValueToField<true>(field_map.Get(i)); 3456 } else { 3457 it.ReadValueToField<false>(field_map.Get(i)); 3458 } 3459 } 3460 } 3461 } 3462 3463 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3464 if (clinit != NULL) { 3465 CHECK(can_init_statics); 3466 JValue result; 3467 clinit->Invoke(self, NULL, 0, &result, "V"); 3468 } 3469 3470 uint64_t t1 = NanoTime(); 3471 3472 bool success = true; 3473 { 3474 ObjectLock<mirror::Class> lock(self, klass); 3475 3476 if (self->IsExceptionPending()) { 3477 WrapExceptionInInitializer(); 3478 klass->SetStatus(mirror::Class::kStatusError, self); 3479 success = false; 3480 } else { 3481 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3482 RuntimeStats* thread_stats = self->GetStats(); 3483 ++global_stats->class_init_count; 3484 ++thread_stats->class_init_count; 3485 global_stats->class_init_time_ns += (t1 - t0); 3486 thread_stats->class_init_time_ns += (t1 - t0); 3487 // Set the class as initialized except if failed to initialize static fields. 3488 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3489 if (VLOG_IS_ON(class_linker)) { 3490 LOG(INFO) << "Initialized class " << klass->GetDescriptor() << " from " << 3491 klass->GetLocation(); 3492 } 3493 // Opportunistically set static method trampolines to their destination. 3494 FixupStaticTrampolines(klass.Get()); 3495 } 3496 } 3497 return success; 3498} 3499 3500bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3501 ObjectLock<mirror::Class>& lock) 3502 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3503 while (true) { 3504 self->AssertNoPendingException(); 3505 CHECK(!klass->IsInitialized()); 3506 lock.WaitIgnoringInterrupts(); 3507 3508 // When we wake up, repeat the test for init-in-progress. If 3509 // there's an exception pending (only possible if 3510 // "interruptShouldThrow" was set), bail out. 3511 if (self->IsExceptionPending()) { 3512 WrapExceptionInInitializer(); 3513 klass->SetStatus(mirror::Class::kStatusError, self); 3514 return false; 3515 } 3516 // Spurious wakeup? Go back to waiting. 3517 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3518 continue; 3519 } 3520 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3521 // Compile time initialization failed. 3522 return false; 3523 } 3524 if (klass->IsErroneous()) { 3525 // The caller wants an exception, but it was thrown in a 3526 // different thread. Synthesize one here. 3527 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3528 PrettyDescriptor(klass.Get()).c_str()); 3529 return false; 3530 } 3531 if (klass->IsInitialized()) { 3532 return true; 3533 } 3534 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 3535 << klass->GetStatus(); 3536 } 3537 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 3538} 3539 3540bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 3541 if (klass->IsInterface()) { 3542 return true; 3543 } 3544 // Begin with the methods local to the superclass. 3545 StackHandleScope<2> hs(Thread::Current()); 3546 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3547 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3548 if (klass->HasSuperClass() && 3549 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3550 for (int i = klass->GetSuperClass()->GetVTable()->GetLength() - 1; i >= 0; --i) { 3551 mh.ChangeMethod(klass->GetVTable()->GetWithoutChecks(i)); 3552 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTable()->GetWithoutChecks(i)); 3553 if (mh.GetMethod() != super_mh.GetMethod() && 3554 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3555 ThrowLinkageError(klass.Get(), 3556 "Class %s method %s resolves differently in superclass %s", 3557 PrettyDescriptor(klass.Get()).c_str(), 3558 PrettyMethod(mh.GetMethod()).c_str(), 3559 PrettyDescriptor(klass->GetSuperClass()).c_str()); 3560 return false; 3561 } 3562 } 3563 } 3564 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3565 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 3566 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 3567 for (uint32_t j = 0; j < num_methods; ++j) { 3568 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 3569 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 3570 if (mh.GetMethod() != super_mh.GetMethod() && 3571 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3572 ThrowLinkageError(klass.Get(), 3573 "Class %s method %s resolves differently in interface %s", 3574 PrettyDescriptor(klass.Get()).c_str(), 3575 PrettyMethod(mh.GetMethod()).c_str(), 3576 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 3577 return false; 3578 } 3579 } 3580 } 3581 } 3582 return true; 3583} 3584 3585bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 3586 bool can_init_parents) { 3587 DCHECK(c.Get() != nullptr); 3588 const bool success = c->IsInitialized() || InitializeClass(c, can_init_fields, can_init_parents); 3589 if (!success && can_init_fields && can_init_parents) { 3590 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.Get()); 3591 } 3592 return success; 3593} 3594 3595void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3596 mirror::Class* c, 3597 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3598 const byte* class_data = dex_file.GetClassData(dex_class_def); 3599 ClassDataItemIterator it(dex_file, class_data); 3600 StackHandleScope<2> hs(Thread::Current()); 3601 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 3602 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 3603 CHECK(!kMovingFields); 3604 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3605 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3606 } 3607} 3608 3609void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 3610 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 3611 if (fields != nullptr) { 3612 for (int index = 0; index < fields->GetLength(); index ++) { 3613 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 3614 fields->Get(index)->SetDeclaringClass(new_class); 3615 } 3616 } 3617 } 3618 3619 fields = new_class->GetSFields(); 3620 if (fields != nullptr) { 3621 for (int index = 0; index < fields->GetLength(); index ++) { 3622 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 3623 fields->Get(index)->SetDeclaringClass(new_class); 3624 } 3625 } 3626 } 3627 3628 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 3629 if (methods != nullptr) { 3630 for (int index = 0; index < methods->GetLength(); index ++) { 3631 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 3632 methods->Get(index)->SetDeclaringClass(new_class); 3633 } 3634 } 3635 } 3636 3637 methods = new_class->GetVirtualMethods(); 3638 if (methods != nullptr) { 3639 for (int index = 0; index < methods->GetLength(); index ++) { 3640 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 3641 methods->Get(index)->SetDeclaringClass(new_class); 3642 } 3643 } 3644 } 3645} 3646 3647bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 3648 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 3649 mirror::Class** new_class) { 3650 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3651 3652 if (!LinkSuperClass(klass)) { 3653 return false; 3654 } 3655 if (!LinkMethods(self, klass, interfaces)) { 3656 return false; 3657 } 3658 if (!LinkInstanceFields(klass)) { 3659 return false; 3660 } 3661 size_t class_size; 3662 if (!LinkStaticFields(klass, &class_size)) { 3663 return false; 3664 } 3665 CreateReferenceInstanceOffsets(klass); 3666 CreateReferenceStaticOffsets(klass); 3667 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3668 3669 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 3670 // We don't need to retire this class as it has no embedded tables or it was created the 3671 // correct size during class linker initialization. 3672 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 3673 3674 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 3675 klass->PopulateEmbeddedImtAndVTable(); 3676 } 3677 3678 // This will notify waiters on klass that saw the not yet resolved 3679 // class in the class_table_ during EnsureResolved. 3680 klass->SetStatus(mirror::Class::kStatusResolved, self); 3681 *new_class = klass.Get(); 3682 } else { 3683 CHECK(!klass->IsResolved()); 3684 // Retire the temporary class and create the correctly sized resolved class. 3685 *new_class = klass->CopyOf(self, class_size); 3686 if (UNLIKELY(*new_class == NULL)) { 3687 CHECK(self->IsExceptionPending()); // Expect an OOME. 3688 klass->SetStatus(mirror::Class::kStatusError, self); 3689 return false; 3690 } 3691 3692 CHECK_EQ((*new_class)->GetClassSize(), class_size); 3693 StackHandleScope<1> hs(self); 3694 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 3695 ObjectLock<mirror::Class> lock(self, new_class_h); 3696 3697 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 3698 3699 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 3700 CHECK(existing == NULL || existing == klass.Get()); 3701 3702 // This will notify waiters on temp class that saw the not yet resolved class in the 3703 // class_table_ during EnsureResolved. 3704 klass->SetStatus(mirror::Class::kStatusRetired, self); 3705 3706 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 3707 // This will notify waiters on new_class that saw the not yet resolved 3708 // class in the class_table_ during EnsureResolved. 3709 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 3710 3711 // Only embedded imt should be used from this point. 3712 new_class_h->SetImTable(NULL); 3713 // TODO: remove vtable and only use embedded vtable. 3714 } 3715 return true; 3716} 3717 3718bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 3719 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3720 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3721 uint16_t super_class_idx = class_def.superclass_idx_; 3722 if (super_class_idx != DexFile::kDexNoIndex16) { 3723 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 3724 if (super_class == NULL) { 3725 DCHECK(Thread::Current()->IsExceptionPending()); 3726 return false; 3727 } 3728 // Verify 3729 if (!klass->CanAccess(super_class)) { 3730 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 3731 PrettyDescriptor(super_class).c_str(), 3732 PrettyDescriptor(klass.Get()).c_str()); 3733 return false; 3734 } 3735 CHECK(super_class->IsResolved()); 3736 klass->SetSuperClass(super_class); 3737 } 3738 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3739 if (interfaces != NULL) { 3740 for (size_t i = 0; i < interfaces->Size(); i++) { 3741 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3742 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 3743 if (interface == NULL) { 3744 DCHECK(Thread::Current()->IsExceptionPending()); 3745 return false; 3746 } 3747 // Verify 3748 if (!klass->CanAccess(interface)) { 3749 // TODO: the RI seemed to ignore this in my testing. 3750 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 3751 PrettyDescriptor(interface).c_str(), 3752 PrettyDescriptor(klass.Get()).c_str()); 3753 return false; 3754 } 3755 } 3756 } 3757 // Mark the class as loaded. 3758 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3759 return true; 3760} 3761 3762bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 3763 CHECK(!klass->IsPrimitive()); 3764 mirror::Class* super = klass->GetSuperClass(); 3765 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 3766 if (super != NULL) { 3767 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 3768 return false; 3769 } 3770 return true; 3771 } 3772 if (super == NULL) { 3773 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 3774 PrettyDescriptor(klass.Get()).c_str()); 3775 return false; 3776 } 3777 // Verify 3778 if (super->IsFinal() || super->IsInterface()) { 3779 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 3780 PrettyDescriptor(super).c_str(), 3781 PrettyDescriptor(klass.Get()).c_str(), 3782 super->IsFinal() ? "declared final" : "an interface"); 3783 return false; 3784 } 3785 if (!klass->CanAccess(super)) { 3786 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 3787 PrettyDescriptor(super).c_str(), 3788 PrettyDescriptor(klass.Get()).c_str()); 3789 return false; 3790 } 3791 3792 // Inherit kAccClassIsFinalizable from the superclass in case this 3793 // class doesn't override finalize. 3794 if (super->IsFinalizable()) { 3795 klass->SetFinalizable(); 3796 } 3797 3798 // Inherit reference flags (if any) from the superclass. 3799 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3800 if (reference_flags != 0) { 3801 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3802 } 3803 // Disallow custom direct subclasses of java.lang.ref.Reference. 3804 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3805 ThrowLinkageError(klass.Get(), 3806 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3807 PrettyDescriptor(klass.Get()).c_str()); 3808 return false; 3809 } 3810 3811 if (kIsDebugBuild) { 3812 // Ensure super classes are fully resolved prior to resolving fields.. 3813 while (super != NULL) { 3814 CHECK(super->IsResolved()); 3815 super = super->GetSuperClass(); 3816 } 3817 } 3818 return true; 3819} 3820 3821// Populate the class vtable and itable. Compute return type indices. 3822bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 3823 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3824 if (klass->IsInterface()) { 3825 // No vtable. 3826 size_t count = klass->NumVirtualMethods(); 3827 if (!IsUint(16, count)) { 3828 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 3829 return false; 3830 } 3831 for (size_t i = 0; i < count; ++i) { 3832 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3833 } 3834 // Link interface method tables 3835 return LinkInterfaceMethods(klass, interfaces); 3836 } else { 3837 // Link virtual and interface method tables 3838 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 3839 } 3840 return true; 3841} 3842 3843bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 3844 if (klass->HasSuperClass()) { 3845 uint32_t max_count = klass->NumVirtualMethods() + 3846 klass->GetSuperClass()->GetVTable()->GetLength(); 3847 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3848 CHECK_LE(actual_count, max_count); 3849 // TODO: do not assign to the vtable field until it is fully constructed. 3850 StackHandleScope<3> hs(self); 3851 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3852 hs.NewHandle(klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count))); 3853 if (UNLIKELY(vtable.Get() == NULL)) { 3854 CHECK(self->IsExceptionPending()); // OOME. 3855 return false; 3856 } 3857 // See if any of our virtual methods override the superclass. 3858 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3859 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3860 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3861 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3862 local_mh.ChangeMethod(local_method); 3863 size_t j = 0; 3864 for (; j < actual_count; ++j) { 3865 mirror::ArtMethod* super_method = vtable->Get(j); 3866 super_mh.ChangeMethod(super_method); 3867 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3868 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 3869 super_method->GetAccessFlags())) { 3870 if (super_method->IsFinal()) { 3871 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 3872 PrettyMethod(local_method).c_str(), 3873 super_method->GetDeclaringClassDescriptor()); 3874 return false; 3875 } 3876 vtable->Set<false>(j, local_method); 3877 local_method->SetMethodIndex(j); 3878 break; 3879 } else { 3880 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3881 << " would have incorrectly overridden the package-private method in " 3882 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 3883 } 3884 } 3885 } 3886 if (j == actual_count) { 3887 // Not overriding, append. 3888 vtable->Set<false>(actual_count, local_method); 3889 local_method->SetMethodIndex(actual_count); 3890 actual_count += 1; 3891 } 3892 } 3893 if (!IsUint(16, actual_count)) { 3894 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 3895 return false; 3896 } 3897 // Shrink vtable if possible 3898 CHECK_LE(actual_count, max_count); 3899 if (actual_count < max_count) { 3900 vtable.Assign(vtable->CopyOf(self, actual_count)); 3901 if (UNLIKELY(vtable.Get() == NULL)) { 3902 CHECK(self->IsExceptionPending()); // OOME. 3903 return false; 3904 } 3905 } 3906 klass->SetVTable(vtable.Get()); 3907 } else { 3908 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 3909 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3910 if (!IsUint(16, num_virtual_methods)) { 3911 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 3912 return false; 3913 } 3914 StackHandleScope<1> hs(self); 3915 Handle<mirror::ObjectArray<mirror::ArtMethod>> 3916 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 3917 if (UNLIKELY(vtable.Get() == NULL)) { 3918 CHECK(self->IsExceptionPending()); // OOME. 3919 return false; 3920 } 3921 for (size_t i = 0; i < num_virtual_methods; ++i) { 3922 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3923 vtable->Set<false>(i, virtual_method); 3924 virtual_method->SetMethodIndex(i & 0xFFFF); 3925 } 3926 klass->SetVTable(vtable.Get()); 3927 } 3928 return true; 3929} 3930 3931bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 3932 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3933 Thread* const self = Thread::Current(); 3934 Runtime* const runtime = Runtime::Current(); 3935 // Set the imt table to be all conflicts by default. 3936 klass->SetImTable(runtime->GetDefaultImt()); 3937 size_t super_ifcount; 3938 if (klass->HasSuperClass()) { 3939 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3940 } else { 3941 super_ifcount = 0; 3942 } 3943 uint32_t num_interfaces = 3944 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 3945 size_t ifcount = super_ifcount + num_interfaces; 3946 for (size_t i = 0; i < num_interfaces; i++) { 3947 mirror::Class* interface = 3948 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 3949 interfaces->Get(i); 3950 ifcount += interface->GetIfTableCount(); 3951 } 3952 if (ifcount == 0) { 3953 // Class implements no interfaces. 3954 DCHECK_EQ(klass->GetIfTableCount(), 0); 3955 DCHECK(klass->GetIfTable() == NULL); 3956 return true; 3957 } 3958 if (ifcount == super_ifcount) { 3959 // Class implements same interfaces as parent, are any of these not marker interfaces? 3960 bool has_non_marker_interface = false; 3961 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3962 for (size_t i = 0; i < ifcount; ++i) { 3963 if (super_iftable->GetMethodArrayCount(i) > 0) { 3964 has_non_marker_interface = true; 3965 break; 3966 } 3967 } 3968 if (!has_non_marker_interface) { 3969 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3970 klass->SetIfTable(super_iftable); 3971 return true; 3972 } 3973 } 3974 StackHandleScope<4> hs(self); 3975 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 3976 if (UNLIKELY(iftable.Get() == NULL)) { 3977 CHECK(self->IsExceptionPending()); // OOME. 3978 return false; 3979 } 3980 if (super_ifcount != 0) { 3981 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3982 for (size_t i = 0; i < super_ifcount; i++) { 3983 mirror::Class* super_interface = super_iftable->GetInterface(i); 3984 iftable->SetInterface(i, super_interface); 3985 } 3986 } 3987 // Flatten the interface inheritance hierarchy. 3988 size_t idx = super_ifcount; 3989 for (size_t i = 0; i < num_interfaces; i++) { 3990 mirror::Class* interface = 3991 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 3992 interfaces->Get(i); 3993 DCHECK(interface != NULL); 3994 if (!interface->IsInterface()) { 3995 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 3996 PrettyDescriptor(klass.Get()).c_str(), 3997 PrettyDescriptor(interface->GetDescriptor()).c_str()); 3998 return false; 3999 } 4000 // Check if interface is already in iftable 4001 bool duplicate = false; 4002 for (size_t j = 0; j < idx; j++) { 4003 mirror::Class* existing_interface = iftable->GetInterface(j); 4004 if (existing_interface == interface) { 4005 duplicate = true; 4006 break; 4007 } 4008 } 4009 if (!duplicate) { 4010 // Add this non-duplicate interface. 4011 iftable->SetInterface(idx++, interface); 4012 // Add this interface's non-duplicate super-interfaces. 4013 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4014 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4015 bool super_duplicate = false; 4016 for (size_t k = 0; k < idx; k++) { 4017 mirror::Class* existing_interface = iftable->GetInterface(k); 4018 if (existing_interface == super_interface) { 4019 super_duplicate = true; 4020 break; 4021 } 4022 } 4023 if (!super_duplicate) { 4024 iftable->SetInterface(idx++, super_interface); 4025 } 4026 } 4027 } 4028 } 4029 // Shrink iftable in case duplicates were found 4030 if (idx < ifcount) { 4031 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4032 if (UNLIKELY(iftable.Get() == NULL)) { 4033 CHECK(self->IsExceptionPending()); // OOME. 4034 return false; 4035 } 4036 ifcount = idx; 4037 } else { 4038 CHECK_EQ(idx, ifcount); 4039 } 4040 klass->SetIfTable(iftable.Get()); 4041 4042 // If we're an interface, we don't need the vtable pointers, so we're done. 4043 if (klass->IsInterface()) { 4044 return true; 4045 } 4046 // Allocate imtable 4047 bool imtable_changed = false; 4048 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4049 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4050 if (UNLIKELY(imtable.Get() == NULL)) { 4051 CHECK(self->IsExceptionPending()); // OOME. 4052 return false; 4053 } 4054 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4055 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4056 std::vector<mirror::ArtMethod*> miranda_list; 4057 for (size_t i = 0; i < ifcount; ++i) { 4058 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4059 if (num_methods > 0) { 4060 StackHandleScope<2> hs(self); 4061 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4062 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4063 if (UNLIKELY(method_array.Get() == nullptr)) { 4064 CHECK(self->IsExceptionPending()); // OOME. 4065 return false; 4066 } 4067 iftable->SetMethodArray(i, method_array.Get()); 4068 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4069 hs.NewHandle(klass->GetVTableDuringLinking())); 4070 for (size_t j = 0; j < num_methods; ++j) { 4071 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 4072 interface_mh.ChangeMethod(interface_method); 4073 int32_t k; 4074 // For each method listed in the interface's method list, find the 4075 // matching method in our class's method list. We want to favor the 4076 // subclass over the superclass, which just requires walking 4077 // back from the end of the vtable. (This only matters if the 4078 // superclass defines a private method and this class redefines 4079 // it -- otherwise it would use the same vtable slot. In .dex files 4080 // those don't end up in the virtual method table, so it shouldn't 4081 // matter which direction we go. We walk it backward anyway.) 4082 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4083 mirror::ArtMethod* vtable_method = vtable->Get(k); 4084 vtable_mh.ChangeMethod(vtable_method); 4085 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4086 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 4087 ThrowIllegalAccessError( 4088 klass.Get(), 4089 "Method '%s' implementing interface method '%s' is not public", 4090 PrettyMethod(vtable_method).c_str(), 4091 PrettyMethod(interface_method).c_str()); 4092 return false; 4093 } 4094 method_array->Set<false>(j, vtable_method); 4095 // Place method in imt if entry is empty, place conflict otherwise. 4096 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4097 if (imtable->Get(imt_index) == NULL) { 4098 imtable->Set<false>(imt_index, vtable_method); 4099 imtable_changed = true; 4100 } else { 4101 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4102 } 4103 break; 4104 } 4105 } 4106 if (k < 0) { 4107 StackHandleScope<1> hs(self); 4108 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4109 for (mirror::ArtMethod* mir_method : miranda_list) { 4110 vtable_mh.ChangeMethod(mir_method); 4111 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4112 miranda_method.Assign(mir_method); 4113 break; 4114 } 4115 } 4116 if (miranda_method.Get() == NULL) { 4117 // Point the interface table at a phantom slot. 4118 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 4119 if (UNLIKELY(miranda_method.Get() == NULL)) { 4120 CHECK(self->IsExceptionPending()); // OOME. 4121 return false; 4122 } 4123 // TODO: If a methods move then the miranda_list may hold stale references. 4124 miranda_list.push_back(miranda_method.Get()); 4125 } 4126 method_array->Set<false>(j, miranda_method.Get()); 4127 } 4128 } 4129 } 4130 } 4131 if (imtable_changed) { 4132 // Fill in empty entries in interface method table with conflict. 4133 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4134 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4135 if (imtable->Get(i) == NULL) { 4136 imtable->Set<false>(i, imt_conflict_method); 4137 } 4138 } 4139 klass->SetImTable(imtable.Get()); 4140 } 4141 if (!miranda_list.empty()) { 4142 int old_method_count = klass->NumVirtualMethods(); 4143 int new_method_count = old_method_count + miranda_list.size(); 4144 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4145 if (old_method_count == 0) { 4146 virtuals = AllocArtMethodArray(self, new_method_count); 4147 } else { 4148 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4149 } 4150 if (UNLIKELY(virtuals == NULL)) { 4151 CHECK(self->IsExceptionPending()); // OOME. 4152 return false; 4153 } 4154 klass->SetVirtualMethods(virtuals); 4155 4156 StackHandleScope<1> hs(self); 4157 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4158 hs.NewHandle(klass->GetVTableDuringLinking())); 4159 CHECK(vtable.Get() != NULL); 4160 int old_vtable_count = vtable->GetLength(); 4161 int new_vtable_count = old_vtable_count + miranda_list.size(); 4162 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4163 if (UNLIKELY(vtable.Get() == NULL)) { 4164 CHECK(self->IsExceptionPending()); // OOME. 4165 return false; 4166 } 4167 for (size_t i = 0; i < miranda_list.size(); ++i) { 4168 mirror::ArtMethod* method = miranda_list[i]; 4169 // Leave the declaring class alone as type indices are relative to it 4170 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4171 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4172 klass->SetVirtualMethod(old_method_count + i, method); 4173 vtable->Set<false>(old_vtable_count + i, method); 4174 } 4175 // TODO: do not assign to the vtable field until it is fully constructed. 4176 klass->SetVTable(vtable.Get()); 4177 } 4178 4179 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4180 for (int i = 0; i < vtable->GetLength(); ++i) { 4181 CHECK(vtable->Get(i) != NULL); 4182 } 4183 4184// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4185 4186 return true; 4187} 4188 4189bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4190 CHECK(klass.Get() != NULL); 4191 return LinkFields(klass, false, nullptr); 4192} 4193 4194bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass, size_t* class_size) { 4195 CHECK(klass.Get() != NULL); 4196 return LinkFields(klass, true, class_size); 4197} 4198 4199struct LinkFieldsComparator { 4200 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4201 } 4202 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4203 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4204 NO_THREAD_SAFETY_ANALYSIS { 4205 // First come reference fields, then 64-bit, and finally 32-bit 4206 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4207 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4208 if (type1 != type2) { 4209 bool is_primitive1 = type1 != Primitive::kPrimNot; 4210 bool is_primitive2 = type2 != Primitive::kPrimNot; 4211 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4212 type1 == Primitive::kPrimDouble); 4213 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4214 type2 == Primitive::kPrimDouble); 4215 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4216 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4217 if (order1 != order2) { 4218 return order1 < order2; 4219 } 4220 } 4221 // same basic group? then sort by string. 4222 return strcmp(field1->GetName(), field2->GetName()) < 0; 4223 } 4224}; 4225 4226bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static, size_t* class_size) { 4227 size_t num_fields = 4228 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4229 4230 mirror::ObjectArray<mirror::ArtField>* fields = 4231 is_static ? klass->GetSFields() : klass->GetIFields(); 4232 4233 // Initialize field_offset 4234 MemberOffset field_offset(0); 4235 if (is_static) { 4236 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 4237 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4238 // Static fields come after the embedded tables. 4239 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 4240 0, 0, 0); 4241 } 4242 field_offset = MemberOffset(base); 4243 } else { 4244 mirror::Class* super_class = klass->GetSuperClass(); 4245 if (super_class != NULL) { 4246 CHECK(super_class->IsResolved()) 4247 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4248 field_offset = MemberOffset(super_class->GetObjectSize()); 4249 } 4250 } 4251 4252 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4253 4254 // we want a relatively stable order so that adding new fields 4255 // minimizes disruption of C++ version such as Class and Method. 4256 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4257 for (size_t i = 0; i < num_fields; i++) { 4258 mirror::ArtField* f = fields->Get(i); 4259 CHECK(f != NULL) << PrettyClass(klass.Get()); 4260 grouped_and_sorted_fields.push_back(f); 4261 } 4262 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4263 LinkFieldsComparator()); 4264 4265 // References should be at the front. 4266 size_t current_field = 0; 4267 size_t num_reference_fields = 0; 4268 for (; current_field < num_fields; current_field++) { 4269 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4270 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4271 bool isPrimitive = type != Primitive::kPrimNot; 4272 if (isPrimitive) { 4273 break; // past last reference, move on to the next phase 4274 } 4275 grouped_and_sorted_fields.pop_front(); 4276 num_reference_fields++; 4277 fields->Set<false>(current_field, field); 4278 field->SetOffset(field_offset); 4279 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4280 } 4281 4282 // Now we want to pack all of the double-wide fields together. If 4283 // we're not aligned, though, we want to shuffle one 32-bit field 4284 // into place. If we can't find one, we'll have to pad it. 4285 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4286 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4287 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4288 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4289 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4290 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4291 continue; 4292 } 4293 fields->Set<false>(current_field++, field); 4294 field->SetOffset(field_offset); 4295 // drop the consumed field 4296 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4297 break; 4298 } 4299 // whether we found a 32-bit field for padding or not, we advance 4300 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4301 } 4302 4303 // Alignment is good, shuffle any double-wide fields forward, and 4304 // finish assigning field offsets to all fields. 4305 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 4306 << PrettyClass(klass.Get()); 4307 while (!grouped_and_sorted_fields.empty()) { 4308 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4309 grouped_and_sorted_fields.pop_front(); 4310 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4311 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4312 fields->Set<false>(current_field, field); 4313 field->SetOffset(field_offset); 4314 field_offset = MemberOffset(field_offset.Uint32Value() + 4315 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4316 ? sizeof(uint64_t) 4317 : sizeof(uint32_t))); 4318 current_field++; 4319 } 4320 4321 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4322 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4323 // We know there are no non-reference fields in the Reference classes, and we know 4324 // that 'referent' is alphabetically last, so this is easy... 4325 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4326 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4327 --num_reference_fields; 4328 } 4329 4330 if (kIsDebugBuild) { 4331 // Make sure that all reference fields appear before 4332 // non-reference fields, and all double-wide fields are aligned. 4333 bool seen_non_ref = false; 4334 for (size_t i = 0; i < num_fields; i++) { 4335 mirror::ArtField* field = fields->Get(i); 4336 if (false) { // enable to debug field layout 4337 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4338 << " class=" << PrettyClass(klass.Get()) 4339 << " field=" << PrettyField(field) 4340 << " offset=" 4341 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4342 } 4343 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4344 bool is_primitive = type != Primitive::kPrimNot; 4345 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4346 strcmp("referent", field->GetName()) == 0) { 4347 is_primitive = true; // We lied above, so we have to expect a lie here. 4348 } 4349 if (is_primitive) { 4350 if (!seen_non_ref) { 4351 seen_non_ref = true; 4352 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4353 } 4354 } else { 4355 DCHECK(!seen_non_ref) << PrettyField(field); 4356 } 4357 } 4358 if (!seen_non_ref) { 4359 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4360 } 4361 } 4362 4363 size_t size = field_offset.Uint32Value(); 4364 // Update klass 4365 if (is_static) { 4366 klass->SetNumReferenceStaticFields(num_reference_fields); 4367 *class_size = size; 4368 } else { 4369 klass->SetNumReferenceInstanceFields(num_reference_fields); 4370 if (!klass->IsVariableSize()) { 4371 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(); 4372 size_t previous_size = klass->GetObjectSize(); 4373 if (previous_size != 0) { 4374 // Make sure that we didn't originally have an incorrect size. 4375 CHECK_EQ(previous_size, size) << klass->GetDescriptor(); 4376 } 4377 klass->SetObjectSize(size); 4378 } 4379 } 4380 return true; 4381} 4382 4383// Set the bitmap of reference offsets, refOffsets, from the ifields 4384// list. 4385void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4386 uint32_t reference_offsets = 0; 4387 mirror::Class* super_class = klass->GetSuperClass(); 4388 if (super_class != NULL) { 4389 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4390 // If our superclass overflowed, we don't stand a chance. 4391 if (reference_offsets == CLASS_WALK_SUPER) { 4392 klass->SetReferenceInstanceOffsets(reference_offsets); 4393 return; 4394 } 4395 } 4396 CreateReferenceOffsets(klass, false, reference_offsets); 4397} 4398 4399void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4400 CreateReferenceOffsets(klass, true, 0); 4401} 4402 4403void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4404 uint32_t reference_offsets) { 4405 size_t num_reference_fields = 4406 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4407 : klass->NumReferenceInstanceFieldsDuringLinking(); 4408 mirror::ObjectArray<mirror::ArtField>* fields = 4409 is_static ? klass->GetSFields() : klass->GetIFields(); 4410 // All of the fields that contain object references are guaranteed 4411 // to be at the beginning of the fields list. 4412 for (size_t i = 0; i < num_reference_fields; ++i) { 4413 // Note that byte_offset is the offset from the beginning of 4414 // object, not the offset into instance data 4415 mirror::ArtField* field = fields->Get(i); 4416 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4417 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4418 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4419 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4420 CHECK_NE(new_bit, 0U); 4421 reference_offsets |= new_bit; 4422 } else { 4423 reference_offsets = CLASS_WALK_SUPER; 4424 break; 4425 } 4426 } 4427 // Update fields in klass 4428 if (is_static) { 4429 klass->SetReferenceStaticOffsets(reference_offsets); 4430 } else { 4431 klass->SetReferenceInstanceOffsets(reference_offsets); 4432 } 4433} 4434 4435mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4436 Handle<mirror::DexCache> dex_cache) { 4437 DCHECK(dex_cache.Get() != nullptr); 4438 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4439 if (resolved != NULL) { 4440 return resolved; 4441 } 4442 uint32_t utf16_length; 4443 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4444 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4445 dex_cache->SetResolvedString(string_idx, string); 4446 return string; 4447} 4448 4449mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4450 mirror::Class* referrer) { 4451 StackHandleScope<2> hs(Thread::Current()); 4452 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4453 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4454 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4455} 4456 4457mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4458 Handle<mirror::DexCache> dex_cache, 4459 Handle<mirror::ClassLoader> class_loader) { 4460 DCHECK(dex_cache.Get() != NULL); 4461 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4462 if (resolved == NULL) { 4463 Thread* self = Thread::Current(); 4464 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4465 resolved = FindClass(self, descriptor, class_loader); 4466 if (resolved != NULL) { 4467 // TODO: we used to throw here if resolved's class loader was not the 4468 // boot class loader. This was to permit different classes with the 4469 // same name to be loaded simultaneously by different loaders 4470 dex_cache->SetResolvedType(type_idx, resolved); 4471 } else { 4472 CHECK(self->IsExceptionPending()) 4473 << "Expected pending exception for failed resolution of: " << descriptor; 4474 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4475 StackHandleScope<1> hs(self); 4476 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4477 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4478 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4479 self->ClearException(); 4480 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4481 self->GetException(NULL)->SetCause(cause.Get()); 4482 } 4483 } 4484 } 4485 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4486 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4487 return resolved; 4488} 4489 4490mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 4491 Handle<mirror::DexCache> dex_cache, 4492 Handle<mirror::ClassLoader> class_loader, 4493 Handle<mirror::ArtMethod> referrer, 4494 InvokeType type) { 4495 DCHECK(dex_cache.Get() != NULL); 4496 // Check for hit in the dex cache. 4497 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4498 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 4499 return resolved; 4500 } 4501 // Fail, get the declaring class. 4502 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4503 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4504 if (klass == NULL) { 4505 DCHECK(Thread::Current()->IsExceptionPending()); 4506 return NULL; 4507 } 4508 // Scan using method_idx, this saves string compares but will only hit for matching dex 4509 // caches/files. 4510 switch (type) { 4511 case kDirect: // Fall-through. 4512 case kStatic: 4513 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 4514 break; 4515 case kInterface: 4516 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 4517 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4518 break; 4519 case kSuper: // Fall-through. 4520 case kVirtual: 4521 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 4522 break; 4523 default: 4524 LOG(FATAL) << "Unreachable - invocation type: " << type; 4525 } 4526 if (resolved == NULL) { 4527 // Search by name, which works across dex files. 4528 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4529 const Signature signature = dex_file.GetMethodSignature(method_id); 4530 switch (type) { 4531 case kDirect: // Fall-through. 4532 case kStatic: 4533 resolved = klass->FindDirectMethod(name, signature); 4534 break; 4535 case kInterface: 4536 resolved = klass->FindInterfaceMethod(name, signature); 4537 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4538 break; 4539 case kSuper: // Fall-through. 4540 case kVirtual: 4541 resolved = klass->FindVirtualMethod(name, signature); 4542 break; 4543 } 4544 } 4545 if (resolved != NULL) { 4546 // We found a method, check for incompatible class changes. 4547 if (resolved->CheckIncompatibleClassChange(type)) { 4548 resolved = NULL; 4549 } 4550 } 4551 if (resolved != NULL) { 4552 // Be a good citizen and update the dex cache to speed subsequent calls. 4553 dex_cache->SetResolvedMethod(method_idx, resolved); 4554 return resolved; 4555 } else { 4556 // We failed to find the method which means either an access error, an incompatible class 4557 // change, or no such method. First try to find the method among direct and virtual methods. 4558 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4559 const Signature signature = dex_file.GetMethodSignature(method_id); 4560 switch (type) { 4561 case kDirect: 4562 case kStatic: 4563 resolved = klass->FindVirtualMethod(name, signature); 4564 break; 4565 case kInterface: 4566 case kVirtual: 4567 case kSuper: 4568 resolved = klass->FindDirectMethod(name, signature); 4569 break; 4570 } 4571 4572 // If we found something, check that it can be accessed by the referrer. 4573 if (resolved != NULL && referrer.Get() != NULL) { 4574 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4575 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4576 if (!referring_class->CanAccess(methods_class)) { 4577 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4578 resolved, type); 4579 return NULL; 4580 } else if (!referring_class->CanAccessMember(methods_class, 4581 resolved->GetAccessFlags())) { 4582 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4583 return NULL; 4584 } 4585 } 4586 4587 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4588 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4589 switch (type) { 4590 case kDirect: 4591 case kStatic: 4592 if (resolved != NULL) { 4593 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4594 } else { 4595 resolved = klass->FindInterfaceMethod(name, signature); 4596 if (resolved != NULL) { 4597 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4598 } else { 4599 ThrowNoSuchMethodError(type, klass, name, signature); 4600 } 4601 } 4602 break; 4603 case kInterface: 4604 if (resolved != NULL) { 4605 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4606 } else { 4607 resolved = klass->FindVirtualMethod(name, signature); 4608 if (resolved != NULL) { 4609 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4610 } else { 4611 ThrowNoSuchMethodError(type, klass, name, signature); 4612 } 4613 } 4614 break; 4615 case kSuper: 4616 ThrowNoSuchMethodError(type, klass, name, signature); 4617 break; 4618 case kVirtual: 4619 if (resolved != NULL) { 4620 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4621 } else { 4622 resolved = klass->FindInterfaceMethod(name, signature); 4623 if (resolved != NULL) { 4624 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4625 } else { 4626 ThrowNoSuchMethodError(type, klass, name, signature); 4627 } 4628 } 4629 break; 4630 } 4631 DCHECK(Thread::Current()->IsExceptionPending()); 4632 return NULL; 4633 } 4634} 4635 4636mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4637 Handle<mirror::DexCache> dex_cache, 4638 Handle<mirror::ClassLoader> class_loader, 4639 bool is_static) { 4640 DCHECK(dex_cache.Get() != nullptr); 4641 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4642 if (resolved != NULL) { 4643 return resolved; 4644 } 4645 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4646 Thread* const self = Thread::Current(); 4647 StackHandleScope<1> hs(self); 4648 Handle<mirror::Class> klass( 4649 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4650 if (klass.Get() == NULL) { 4651 DCHECK(Thread::Current()->IsExceptionPending()); 4652 return NULL; 4653 } 4654 4655 if (is_static) { 4656 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 4657 } else { 4658 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 4659 } 4660 4661 if (resolved == NULL) { 4662 const char* name = dex_file.GetFieldName(field_id); 4663 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4664 if (is_static) { 4665 resolved = mirror::Class::FindStaticField(self, klass, name, type); 4666 } else { 4667 resolved = klass->FindInstanceField(name, type); 4668 } 4669 if (resolved == NULL) { 4670 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 4671 return NULL; 4672 } 4673 } 4674 dex_cache->SetResolvedField(field_idx, resolved); 4675 return resolved; 4676} 4677 4678mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4679 uint32_t field_idx, 4680 Handle<mirror::DexCache> dex_cache, 4681 Handle<mirror::ClassLoader> class_loader) { 4682 DCHECK(dex_cache.Get() != nullptr); 4683 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4684 if (resolved != NULL) { 4685 return resolved; 4686 } 4687 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4688 Thread* self = Thread::Current(); 4689 StackHandleScope<1> hs(self); 4690 Handle<mirror::Class> klass( 4691 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4692 if (klass.Get() == NULL) { 4693 DCHECK(Thread::Current()->IsExceptionPending()); 4694 return NULL; 4695 } 4696 4697 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4698 StringPiece type(dex_file.StringDataByIdx( 4699 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4700 resolved = mirror::Class::FindField(self, klass, name, type); 4701 if (resolved != NULL) { 4702 dex_cache->SetResolvedField(field_idx, resolved); 4703 } else { 4704 ThrowNoSuchFieldError("", klass.Get(), type, name); 4705 } 4706 return resolved; 4707} 4708 4709const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4710 uint32_t* length) { 4711 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4712 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4713 const DexFile& dex_file = *dex_cache->GetDexFile(); 4714 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4715 return dex_file.GetMethodShorty(method_id, length); 4716} 4717 4718void ClassLinker::DumpAllClasses(int flags) { 4719 if (dex_cache_image_class_lookup_required_) { 4720 MoveImageClassesToClassTable(); 4721 } 4722 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4723 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4724 std::vector<mirror::Class*> all_classes; 4725 { 4726 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4727 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 4728 mirror::Class** root = &it.second; 4729 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 4730 all_classes.push_back(klass); 4731 } 4732 } 4733 4734 for (size_t i = 0; i < all_classes.size(); ++i) { 4735 all_classes[i]->DumpClass(std::cerr, flags); 4736 } 4737} 4738 4739void ClassLinker::DumpForSigQuit(std::ostream& os) { 4740 if (dex_cache_image_class_lookup_required_) { 4741 MoveImageClassesToClassTable(); 4742 } 4743 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4744 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4745} 4746 4747size_t ClassLinker::NumLoadedClasses() { 4748 if (dex_cache_image_class_lookup_required_) { 4749 MoveImageClassesToClassTable(); 4750 } 4751 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4752 return class_table_.size(); 4753} 4754 4755pid_t ClassLinker::GetClassesLockOwner() { 4756 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4757} 4758 4759pid_t ClassLinker::GetDexLockOwner() { 4760 return dex_lock_.GetExclusiveOwnerTid(); 4761} 4762 4763void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4764 DCHECK(!init_done_); 4765 4766 DCHECK(klass != NULL); 4767 DCHECK(klass->GetClassLoader() == NULL); 4768 4769 mirror::ObjectArray<mirror::Class>* class_roots = 4770 ReadBarrier::BarrierForRoot<mirror::ObjectArray<mirror::Class>, kWithReadBarrier>( 4771 &class_roots_); 4772 DCHECK(class_roots != NULL); 4773 DCHECK(class_roots->Get(class_root) == NULL); 4774 class_roots->Set<false>(class_root, klass); 4775} 4776 4777} // namespace art 4778