class_linker.cc revision 79cfc0e93e210e548b45459478a154168d2d8cc2
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <fcntl.h> 20#include <sys/file.h> 21#include <sys/stat.h> 22#include <deque> 23#include <memory> 24#include <string> 25#include <utility> 26#include <vector> 27 28#include "base/casts.h" 29#include "base/logging.h" 30#include "base/scoped_flock.h" 31#include "base/stl_util.h" 32#include "base/unix_file/fd_file.h" 33#include "class_linker-inl.h" 34#include "compiler_callbacks.h" 35#include "debugger.h" 36#include "dex_file-inl.h" 37#include "gc_root-inl.h" 38#include "gc/accounting/card_table-inl.h" 39#include "gc/accounting/heap_bitmap.h" 40#include "gc/heap.h" 41#include "gc/space/image_space.h" 42#include "handle_scope.h" 43#include "intern_table.h" 44#include "interpreter/interpreter.h" 45#include "leb128.h" 46#include "method_helper-inl.h" 47#include "oat.h" 48#include "oat_file.h" 49#include "object_lock.h" 50#include "mirror/art_field-inl.h" 51#include "mirror/art_method-inl.h" 52#include "mirror/class.h" 53#include "mirror/class-inl.h" 54#include "mirror/class_loader.h" 55#include "mirror/dex_cache-inl.h" 56#include "mirror/iftable-inl.h" 57#include "mirror/object-inl.h" 58#include "mirror/object_array-inl.h" 59#include "mirror/proxy.h" 60#include "mirror/reference-inl.h" 61#include "mirror/stack_trace_element.h" 62#include "mirror/string-inl.h" 63#include "os.h" 64#include "runtime.h" 65#include "entrypoints/entrypoint_utils.h" 66#include "ScopedLocalRef.h" 67#include "scoped_thread_state_change.h" 68#include "handle_scope-inl.h" 69#include "thread.h" 70#include "utils.h" 71#include "verifier/method_verifier.h" 72#include "well_known_classes.h" 73 74namespace art { 75 76static void ThrowNoClassDefFoundError(const char* fmt, ...) 77 __attribute__((__format__(__printf__, 1, 2))) 78 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 79static void ThrowNoClassDefFoundError(const char* fmt, ...) { 80 va_list args; 81 va_start(args, fmt); 82 Thread* self = Thread::Current(); 83 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 84 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 85 va_end(args); 86} 87 88static void ThrowEarlierClassFailure(mirror::Class* c) 89 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 90 // The class failed to initialize on a previous attempt, so we want to throw 91 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 92 // failed in verification, in which case v2 5.4.1 says we need to re-throw 93 // the previous error. 94 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 95 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 96 } 97 98 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 99 Thread* self = Thread::Current(); 100 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 101 if (c->GetVerifyErrorClass() != NULL) { 102 // TODO: change the verifier to store an _instance_, with a useful detail message? 103 std::string temp; 104 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 105 PrettyDescriptor(c).c_str()); 106 } else { 107 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 108 PrettyDescriptor(c).c_str()); 109 } 110} 111 112static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 113 Thread* self = Thread::Current(); 114 JNIEnv* env = self->GetJniEnv(); 115 116 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 117 CHECK(cause.get() != NULL); 118 119 env->ExceptionClear(); 120 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 121 env->Throw(cause.get()); 122 123 // We only wrap non-Error exceptions; an Error can just be used as-is. 124 if (!is_error) { 125 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 126 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 127 } 128} 129 130static size_t Hash(const char* s) { 131 // This is the java.lang.String hashcode for convenience, not interoperability. 132 size_t hash = 0; 133 for (; *s != '\0'; ++s) { 134 hash = hash * 31 + *s; 135 } 136 return hash; 137} 138 139const char* ClassLinker::class_roots_descriptors_[] = { 140 "Ljava/lang/Class;", 141 "Ljava/lang/Object;", 142 "[Ljava/lang/Class;", 143 "[Ljava/lang/Object;", 144 "Ljava/lang/String;", 145 "Ljava/lang/DexCache;", 146 "Ljava/lang/ref/Reference;", 147 "Ljava/lang/reflect/ArtField;", 148 "Ljava/lang/reflect/ArtMethod;", 149 "Ljava/lang/reflect/Proxy;", 150 "[Ljava/lang/String;", 151 "[Ljava/lang/reflect/ArtField;", 152 "[Ljava/lang/reflect/ArtMethod;", 153 "Ljava/lang/ClassLoader;", 154 "Ljava/lang/Throwable;", 155 "Ljava/lang/ClassNotFoundException;", 156 "Ljava/lang/StackTraceElement;", 157 "Z", 158 "B", 159 "C", 160 "D", 161 "F", 162 "I", 163 "J", 164 "S", 165 "V", 166 "[Z", 167 "[B", 168 "[C", 169 "[D", 170 "[F", 171 "[I", 172 "[J", 173 "[S", 174 "[Ljava/lang/StackTraceElement;", 175}; 176 177ClassLinker::ClassLinker(InternTable* intern_table) 178 // dex_lock_ is recursive as it may be used in stack dumping. 179 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 180 dex_cache_image_class_lookup_required_(false), 181 failed_dex_cache_class_lookups_(0), 182 class_roots_(nullptr), 183 array_iftable_(nullptr), 184 find_array_class_cache_next_victim_(0), 185 init_done_(false), 186 log_new_dex_caches_roots_(false), 187 log_new_class_table_roots_(false), 188 intern_table_(intern_table), 189 portable_resolution_trampoline_(nullptr), 190 quick_resolution_trampoline_(nullptr), 191 portable_imt_conflict_trampoline_(nullptr), 192 quick_imt_conflict_trampoline_(nullptr), 193 quick_generic_jni_trampoline_(nullptr), 194 quick_to_interpreter_bridge_trampoline_(nullptr) { 195 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 196 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 197} 198 199// To set a value for generic JNI. May be necessary in compiler tests. 200extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 201extern "C" void art_quick_resolution_trampoline(mirror::ArtMethod*); 202extern "C" void art_quick_imt_conflict_trampoline(mirror::ArtMethod*); 203extern "C" void art_quick_to_interpreter_bridge(mirror::ArtMethod*); 204 205void ClassLinker::InitWithoutImage(const std::vector<const DexFile*>& boot_class_path) { 206 VLOG(startup) << "ClassLinker::Init"; 207 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 208 209 CHECK(!init_done_); 210 211 // java_lang_Class comes first, it's needed for AllocClass 212 Thread* self = Thread::Current(); 213 gc::Heap* heap = Runtime::Current()->GetHeap(); 214 // The GC can't handle an object with a null class since we can't get the size of this object. 215 heap->IncrementDisableMovingGC(self); 216 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 217 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 218 heap->AllocNonMovableObject<true>(self, nullptr, 219 mirror::Class::ClassClassSize(), 220 VoidFunctor())))); 221 CHECK(java_lang_Class.Get() != NULL); 222 mirror::Class::SetClassClass(java_lang_Class.Get()); 223 java_lang_Class->SetClass(java_lang_Class.Get()); 224 if (kUseBakerOrBrooksReadBarrier) { 225 java_lang_Class->AssertReadBarrierPointer(); 226 } 227 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 228 heap->DecrementDisableMovingGC(self); 229 // AllocClass(mirror::Class*) can now be used 230 231 // Class[] is used for reflection support. 232 Handle<mirror::Class> class_array_class(hs.NewHandle( 233 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 234 class_array_class->SetComponentType(java_lang_Class.Get()); 235 236 // java_lang_Object comes next so that object_array_class can be created. 237 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 238 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 239 CHECK(java_lang_Object.Get() != NULL); 240 // backfill Object as the super class of Class. 241 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 242 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 243 244 // Object[] next to hold class roots. 245 Handle<mirror::Class> object_array_class(hs.NewHandle( 246 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 247 object_array_class->SetComponentType(java_lang_Object.Get()); 248 249 // Setup the char (primitive) class to be used for char[]. 250 Handle<mirror::Class> char_class(hs.NewHandle( 251 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 252 253 // Setup the char[] class to be used for String. 254 Handle<mirror::Class> char_array_class(hs.NewHandle( 255 AllocClass(self, java_lang_Class.Get(), 256 mirror::Array::ClassSize()))); 257 char_array_class->SetComponentType(char_class.Get()); 258 mirror::CharArray::SetArrayClass(char_array_class.Get()); 259 260 // Setup String. 261 Handle<mirror::Class> java_lang_String(hs.NewHandle( 262 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 263 mirror::String::SetClass(java_lang_String.Get()); 264 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 265 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 266 267 // Setup Reference. 268 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 269 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 270 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 271 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 272 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 273 274 // Create storage for root classes, save away our work so far (requires descriptors). 275 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 276 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 277 kClassRootsMax)); 278 CHECK(!class_roots_.IsNull()); 279 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 280 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 281 SetClassRoot(kClassArrayClass, class_array_class.Get()); 282 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 283 SetClassRoot(kCharArrayClass, char_array_class.Get()); 284 SetClassRoot(kJavaLangString, java_lang_String.Get()); 285 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 286 287 // Setup the primitive type classes. 288 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 289 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 290 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 291 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 292 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 293 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 294 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 295 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 296 297 // Create array interface entries to populate once we can load system classes. 298 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 299 300 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 301 Handle<mirror::Class> int_array_class(hs.NewHandle( 302 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 303 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 304 mirror::IntArray::SetArrayClass(int_array_class.Get()); 305 SetClassRoot(kIntArrayClass, int_array_class.Get()); 306 307 // now that these are registered, we can use AllocClass() and AllocObjectArray 308 309 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 310 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 311 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 312 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 313 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 314 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 315 316 // Constructor, Field, Method, and AbstractMethod are necessary so 317 // that FindClass can link members. 318 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 319 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 320 CHECK(java_lang_reflect_ArtField.Get() != NULL); 321 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 322 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 323 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 324 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 325 326 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 327 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 328 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 329 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 330 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 331 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 332 333 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 334 335 // Set up array classes for string, field, method 336 Handle<mirror::Class> object_array_string(hs.NewHandle( 337 AllocClass(self, java_lang_Class.Get(), 338 mirror::ObjectArray<mirror::String>::ClassSize()))); 339 object_array_string->SetComponentType(java_lang_String.Get()); 340 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 341 342 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 343 AllocClass(self, java_lang_Class.Get(), 344 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 345 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 346 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 347 348 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 349 AllocClass(self, java_lang_Class.Get(), 350 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 351 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 352 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 353 354 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 355 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 356 // these roots. 357 CHECK_NE(0U, boot_class_path.size()); 358 for (size_t i = 0; i != boot_class_path.size(); ++i) { 359 const DexFile* dex_file = boot_class_path[i]; 360 CHECK(dex_file != NULL); 361 AppendToBootClassPath(*dex_file); 362 } 363 364 // now we can use FindSystemClass 365 366 // run char class through InitializePrimitiveClass to finish init 367 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 368 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 369 370 // Create runtime resolution and imt conflict methods. Also setup the default imt. 371 Runtime* runtime = Runtime::Current(); 372 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 373 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 374 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 375 376 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 377 // we do not need friend classes or a publicly exposed setter. 378 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 379 if (!runtime->IsCompiler()) { 380 // We need to set up the generic trampolines since we don't have an image. 381 quick_resolution_trampoline_ = reinterpret_cast<void*>(art_quick_resolution_trampoline); 382 quick_imt_conflict_trampoline_ = reinterpret_cast<void*>(art_quick_imt_conflict_trampoline); 383 quick_to_interpreter_bridge_trampoline_ = reinterpret_cast<void*>(art_quick_to_interpreter_bridge); 384 } 385 386 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 387 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 388 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 389 CHECK_EQ(java_lang_Object.Get(), Object_class); 390 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 391 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 392 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 393 std::ostringstream os1, os2; 394 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 395 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 396 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 397 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 398 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 399 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 400 CHECK_EQ(java_lang_String.Get(), String_class); 401 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 402 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 403 404 // Setup the primitive array type classes - can't be done until Object has a vtable. 405 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 406 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 407 408 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 409 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 410 411 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 412 CHECK_EQ(char_array_class.Get(), found_char_array_class); 413 414 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 415 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 416 417 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 418 CHECK_EQ(int_array_class.Get(), found_int_array_class); 419 420 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 421 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 422 423 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 424 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 425 426 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 427 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 428 429 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 430 CHECK_EQ(class_array_class.Get(), found_class_array_class); 431 432 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 433 CHECK_EQ(object_array_class.Get(), found_object_array_class); 434 435 // Setup the single, global copy of "iftable". 436 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 437 CHECK(java_lang_Cloneable != NULL); 438 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 439 CHECK(java_io_Serializable != NULL); 440 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 441 // crawl up and explicitly list all of the supers as well. 442 { 443 mirror::IfTable* array_iftable = array_iftable_.Read(); 444 array_iftable->SetInterface(0, java_lang_Cloneable); 445 array_iftable->SetInterface(1, java_io_Serializable); 446 } 447 448 // Sanity check Class[] and Object[]'s interfaces. 449 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 450 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 451 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 452 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 453 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 454 // dex_cache_ fields and register them in class_table_. 455 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 456 CHECK_EQ(java_lang_Class.Get(), Class_class); 457 458 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 459 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 460 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 461 462 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 463 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 464 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 465 466 mirror::Class* String_array_class = 467 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 468 CHECK_EQ(object_array_string.Get(), String_array_class); 469 470 mirror::Class* Art_method_array_class = 471 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 472 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 473 474 mirror::Class* Art_field_array_class = 475 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 476 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 477 478 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 479 480 // Create java.lang.reflect.Proxy root. 481 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 482 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 483 484 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 485 // finish initializing Reference class 486 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 487 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 488 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 489 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 490 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 491 mirror::Class* java_lang_ref_FinalizerReference = 492 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 493 java_lang_ref_FinalizerReference->SetAccessFlags( 494 java_lang_ref_FinalizerReference->GetAccessFlags() | 495 kAccClassIsReference | kAccClassIsFinalizerReference); 496 mirror::Class* java_lang_ref_PhantomReference = 497 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 498 java_lang_ref_PhantomReference->SetAccessFlags( 499 java_lang_ref_PhantomReference->GetAccessFlags() | 500 kAccClassIsReference | kAccClassIsPhantomReference); 501 mirror::Class* java_lang_ref_SoftReference = 502 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 503 java_lang_ref_SoftReference->SetAccessFlags( 504 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 505 mirror::Class* java_lang_ref_WeakReference = 506 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 507 java_lang_ref_WeakReference->SetAccessFlags( 508 java_lang_ref_WeakReference->GetAccessFlags() | 509 kAccClassIsReference | kAccClassIsWeakReference); 510 511 // Setup the ClassLoader, verifying the object_size_. 512 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 513 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 514 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 515 516 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 517 // java.lang.StackTraceElement as a convenience. 518 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 519 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 520 SetClassRoot(kJavaLangClassNotFoundException, 521 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 522 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 523 SetClassRoot(kJavaLangStackTraceElementArrayClass, 524 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 525 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 526 527 FinishInit(self); 528 529 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 530} 531 532void ClassLinker::FinishInit(Thread* self) { 533 VLOG(startup) << "ClassLinker::FinishInit entering"; 534 535 // Let the heap know some key offsets into java.lang.ref instances 536 // Note: we hard code the field indexes here rather than using FindInstanceField 537 // as the types of the field can't be resolved prior to the runtime being 538 // fully initialized 539 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 540 mirror::Class* java_lang_ref_FinalizerReference = 541 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 542 543 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 544 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 545 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 546 547 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 548 CHECK_STREQ(queue->GetName(), "queue"); 549 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 550 551 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 552 CHECK_STREQ(queueNext->GetName(), "queueNext"); 553 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 554 555 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 556 CHECK_STREQ(referent->GetName(), "referent"); 557 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 558 559 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 560 CHECK_STREQ(zombie->GetName(), "zombie"); 561 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 562 563 // ensure all class_roots_ are initialized 564 for (size_t i = 0; i < kClassRootsMax; i++) { 565 ClassRoot class_root = static_cast<ClassRoot>(i); 566 mirror::Class* klass = GetClassRoot(class_root); 567 CHECK(klass != NULL); 568 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 569 // note SetClassRoot does additional validation. 570 // if possible add new checks there to catch errors early 571 } 572 573 CHECK(!array_iftable_.IsNull()); 574 575 // disable the slow paths in FindClass and CreatePrimitiveClass now 576 // that Object, Class, and Object[] are setup 577 init_done_ = true; 578 579 VLOG(startup) << "ClassLinker::FinishInit exiting"; 580} 581 582void ClassLinker::RunRootClinits() { 583 Thread* self = Thread::Current(); 584 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 585 mirror::Class* c = GetClassRoot(ClassRoot(i)); 586 if (!c->IsArrayClass() && !c->IsPrimitive()) { 587 StackHandleScope<1> hs(self); 588 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 589 EnsureInitialized(h_class, true, true); 590 self->AssertNoPendingException(); 591 } 592 } 593} 594 595bool ClassLinker::GenerateOatFile(const char* dex_filename, 596 int oat_fd, 597 const char* oat_cache_filename, 598 std::string* error_msg) { 599 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 600 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 601 602 gc::Heap* heap = Runtime::Current()->GetHeap(); 603 std::string boot_image_option("--boot-image="); 604 if (heap->GetImageSpace() == nullptr) { 605 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 606 // out of space anyway it might not matter. 607 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 608 "without an image.", dex_filename); 609 return false; 610 } 611 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 612 613 std::string dex_file_option("--dex-file="); 614 dex_file_option += dex_filename; 615 616 std::string oat_fd_option("--oat-fd="); 617 StringAppendF(&oat_fd_option, "%d", oat_fd); 618 619 std::string oat_location_option("--oat-location="); 620 oat_location_option += oat_cache_filename; 621 622 std::vector<std::string> argv; 623 argv.push_back(dex2oat); 624 argv.push_back("--runtime-arg"); 625 argv.push_back("-classpath"); 626 argv.push_back("--runtime-arg"); 627 argv.push_back(Runtime::Current()->GetClassPathString()); 628 629 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 630 631 if (!Runtime::Current()->IsVerificationEnabled()) { 632 argv.push_back("--compiler-filter=verify-none"); 633 } 634 635 if (Runtime::Current()->MustRelocateIfPossible()) { 636 argv.push_back("--runtime-arg"); 637 argv.push_back("-Xrelocate"); 638 } else { 639 argv.push_back("--runtime-arg"); 640 argv.push_back("-Xnorelocate"); 641 } 642 643 if (!kIsTargetBuild) { 644 argv.push_back("--host"); 645 } 646 647 argv.push_back(boot_image_option); 648 argv.push_back(dex_file_option); 649 argv.push_back(oat_fd_option); 650 argv.push_back(oat_location_option); 651 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 652 for (size_t i = 0; i < compiler_options.size(); ++i) { 653 argv.push_back(compiler_options[i].c_str()); 654 } 655 656 return Exec(argv, error_msg); 657} 658 659const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 660 WriterMutexLock mu(Thread::Current(), dex_lock_); 661 if (kIsDebugBuild) { 662 for (size_t i = 0; i < oat_files_.size(); ++i) { 663 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 664 } 665 } 666 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 667 oat_files_.push_back(oat_file); 668 return oat_file; 669} 670 671OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 672 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 673 OatFile* oat_file = space->ReleaseOatFile(); 674 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 675 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 676 return *oat_file; 677} 678 679const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 680 const char* dex_location = dex_file.GetLocation().c_str(); 681 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 682 return FindOpenedOatFile(nullptr, dex_location, &dex_location_checksum); 683} 684 685const OatFile* ClassLinker::FindOpenedOatFile(const char* oat_location, const char* dex_location, 686 const uint32_t* const dex_location_checksum) { 687 ReaderMutexLock mu(Thread::Current(), dex_lock_); 688 for (size_t i = 0; i < oat_files_.size(); i++) { 689 const OatFile* oat_file = oat_files_[i]; 690 DCHECK(oat_file != NULL); 691 692 if (oat_location != nullptr) { 693 if (oat_file->GetLocation() != oat_location) { 694 continue; 695 } 696 } 697 698 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 699 dex_location_checksum, 700 false); 701 if (oat_dex_file != NULL) { 702 return oat_file; 703 } 704 } 705 return NULL; 706} 707 708static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, const char* dex_location, 709 bool generated, 710 std::vector<std::string>* error_msgs, 711 std::vector<const DexFile*>* dex_files) { 712 if (oat_file == nullptr) { 713 return false; 714 } 715 716 size_t old_size = dex_files->size(); // To rollback on error. 717 718 bool success = true; 719 for (size_t i = 0; success; ++i) { 720 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 721 const char* next_name = next_name_str.c_str(); 722 723 uint32_t dex_location_checksum; 724 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 725 std::string error_msg; 726 if (!DexFile::GetChecksum(next_name, dex_location_checksum_pointer, &error_msg)) { 727 DCHECK_EQ(false, i == 0 && generated); 728 dex_location_checksum_pointer = nullptr; 729 } 730 731 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 732 733 if (oat_dex_file == nullptr) { 734 if (i == 0 && generated) { 735 std::string error_msg; 736 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 737 " file'%s'", dex_location, dex_location_checksum, 738 oat_file->GetLocation().c_str()); 739 error_msgs->push_back(error_msg); 740 } 741 break; // Not found, done. 742 } 743 744 // Checksum test. Test must succeed when generated. 745 success = !generated; 746 if (dex_location_checksum_pointer != nullptr) { 747 success = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 748 } 749 750 if (success) { 751 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 752 if (dex_file == nullptr) { 753 success = false; 754 error_msgs->push_back(error_msg); 755 } else { 756 dex_files->push_back(dex_file); 757 } 758 } 759 760 // When we generated the file, we expect success, or something is terribly wrong. 761 CHECK_EQ(false, generated && !success) 762 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 763 << std::hex << " dex_location_checksum=" << dex_location_checksum 764 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 765 } 766 767 if (dex_files->size() == old_size) { 768 success = false; // We did not even find classes.dex 769 } 770 771 if (success) { 772 return true; 773 } else { 774 // Free all the dex files we have loaded. 775 auto it = dex_files->begin() + old_size; 776 auto it_end = dex_files->end(); 777 for (; it != it_end; it++) { 778 delete *it; 779 } 780 dex_files->erase(dex_files->begin() + old_size, it_end); 781 782 return false; 783 } 784} 785 786// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 787// complicates the loading process, as we should not use an iterative loading process, because that 788// would register the oat file and dex files that come before the broken one. Instead, check all 789// multidex ahead of time. 790bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 791 std::vector<std::string>* error_msgs, 792 std::vector<const DexFile*>* dex_files) { 793 // 1) Check whether we have an open oat file. 794 // This requires a dex checksum, use the "primary" one. 795 uint32_t dex_location_checksum; 796 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 797 bool have_checksum = true; 798 std::string checksum_error_msg; 799 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 800 dex_location_checksum_pointer = nullptr; 801 have_checksum = false; 802 } 803 804 bool needs_registering = false; 805 806 std::unique_ptr<const OatFile> open_oat_file(FindOpenedOatFile(oat_location, dex_location, 807 dex_location_checksum_pointer)); 808 809 // 2) If we do not have an open one, maybe there's one on disk already. 810 811 // In case the oat file is not open, we play a locking game here so 812 // that if two different processes race to load and register or generate 813 // (or worse, one tries to open a partial generated file) we will be okay. 814 // This is actually common with apps that use DexClassLoader to work 815 // around the dex method reference limit and that have a background 816 // service running in a separate process. 817 ScopedFlock scoped_flock; 818 819 if (open_oat_file.get() == nullptr) { 820 if (oat_location != nullptr) { 821 // Can only do this if we have a checksum, else error. 822 if (!have_checksum) { 823 error_msgs->push_back(checksum_error_msg); 824 return false; 825 } 826 827 std::string error_msg; 828 829 // We are loading or creating one in the future. Time to set up the file lock. 830 if (!scoped_flock.Init(oat_location, &error_msg)) { 831 error_msgs->push_back(error_msg); 832 return false; 833 } 834 835 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 836 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 837 oat_location, &error_msg)); 838 839 if (open_oat_file.get() == nullptr) { 840 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 841 dex_location, oat_location, error_msg.c_str()); 842 VLOG(class_linker) << compound_msg; 843 error_msgs->push_back(compound_msg); 844 } 845 } else { 846 // TODO: What to lock here? 847 bool obsolete_file_cleanup_failed; 848 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 849 dex_location_checksum_pointer, 850 kRuntimeISA, error_msgs, 851 &obsolete_file_cleanup_failed)); 852 // There's no point in going forward and eventually try to regenerate the 853 // file if we couldn't remove the obsolete one. Mostly likely we will fail 854 // with the same error when trying to write the new file. 855 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 856 if (obsolete_file_cleanup_failed) { 857 return false; 858 } 859 } 860 needs_registering = true; 861 } 862 863 // 3) If we have an oat file, check all contained multidex files for our dex_location. 864 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 865 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, false, error_msgs, 866 dex_files); 867 if (success) { 868 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 869 if (needs_registering) { 870 // We opened the oat file, so we must register it. 871 RegisterOatFile(oat_file); 872 } 873 // If the file isn't executable we failed patchoat but did manage to get the dex files. 874 return oat_file->IsExecutable(); 875 } else { 876 if (needs_registering) { 877 // We opened it, delete it. 878 open_oat_file.reset(); 879 } else { 880 open_oat_file.release(); // Do not delete open oat files. 881 } 882 } 883 884 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 885 886 // Need a checksum, fail else. 887 if (!have_checksum) { 888 error_msgs->push_back(checksum_error_msg); 889 return false; 890 } 891 892 // Look in cache location if no oat_location is given. 893 std::string cache_location; 894 if (oat_location == nullptr) { 895 // Use the dalvik cache. 896 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 897 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 898 oat_location = cache_location.c_str(); 899 } 900 901 bool has_flock = true; 902 // Definitely need to lock now. 903 if (!scoped_flock.HasFile()) { 904 std::string error_msg; 905 if (!scoped_flock.Init(oat_location, &error_msg)) { 906 error_msgs->push_back(error_msg); 907 has_flock = false; 908 } 909 } 910 911 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 912 // Create the oat file. 913 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 914 oat_location, error_msgs)); 915 } 916 917 // Failed, bail. 918 if (open_oat_file.get() == nullptr) { 919 std::string error_msg; 920 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 921 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 922 error_msgs->push_back(error_msg); 923 return false; 924 } 925 926 // Try to load again, but stronger checks. 927 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, true, error_msgs, 928 dex_files); 929 if (success) { 930 RegisterOatFile(open_oat_file.release()); 931 return true; 932 } else { 933 return false; 934 } 935} 936 937const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 938 uint32_t dex_location_checksum, 939 const char* oat_location, 940 std::string* error_msg) { 941 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 942 !Runtime::Current()->IsCompiler(), 943 error_msg)); 944 if (oat_file.get() == nullptr) { 945 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 946 error_msg->c_str()); 947 return nullptr; 948 } 949 Runtime* runtime = Runtime::Current(); 950 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 951 if (image_space != nullptr) { 952 const ImageHeader& image_header = image_space->GetImageHeader(); 953 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 954 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 955 if (expected_image_oat_checksum != actual_image_oat_checksum) { 956 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 957 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 958 actual_image_oat_checksum); 959 return nullptr; 960 } 961 962 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 963 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 964 if (expected_image_oat_offset != actual_image_oat_offset) { 965 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 966 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 967 actual_image_oat_offset); 968 return nullptr; 969 } 970 int32_t expected_patch_delta = image_header.GetPatchDelta(); 971 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 972 if (expected_patch_delta != actual_patch_delta) { 973 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 974 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 975 return nullptr; 976 } 977 } 978 979 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 980 &dex_location_checksum); 981 if (oat_dex_file == nullptr) { 982 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 983 dex_location); 984 return nullptr; 985 } 986 uint32_t expected_dex_checksum = dex_location_checksum; 987 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 988 if (expected_dex_checksum != actual_dex_checksum) { 989 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 990 "found 0x%x", oat_location, expected_dex_checksum, 991 actual_dex_checksum); 992 return nullptr; 993 } 994 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 995 if (dex_file.get() != nullptr) { 996 return oat_file.release(); 997 } else { 998 return nullptr; 999 } 1000} 1001 1002const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1003 int fd, const char* oat_location, 1004 std::vector<std::string>* error_msgs) { 1005 // Generate the output oat file for the dex file 1006 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1007 std::string error_msg; 1008 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1009 CHECK(!error_msg.empty()); 1010 error_msgs->push_back(error_msg); 1011 return nullptr; 1012 } 1013 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 1014 !Runtime::Current()->IsCompiler(), 1015 &error_msg)); 1016 if (oat_file.get() == nullptr) { 1017 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1018 oat_location, error_msg.c_str()); 1019 error_msgs->push_back(compound_msg); 1020 return nullptr; 1021 } 1022 1023 return oat_file.release(); 1024} 1025 1026bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1027 const InstructionSet instruction_set) { 1028 Runtime* runtime = Runtime::Current(); 1029 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1030 if (image_space == nullptr) { 1031 return false; 1032 } 1033 uint32_t image_oat_checksum = 0; 1034 if (instruction_set == kRuntimeISA) { 1035 const ImageHeader& image_header = image_space->GetImageHeader(); 1036 image_oat_checksum = image_header.GetOatChecksum(); 1037 } else { 1038 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1039 image_space->GetImageLocation().c_str(), instruction_set)); 1040 image_oat_checksum = image_header->GetOatChecksum(); 1041 } 1042 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1043} 1044 1045bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1046 const InstructionSet instruction_set, 1047 std::string* error_msg) { 1048 Runtime* runtime = Runtime::Current(); 1049 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1050 if (image_space == nullptr) { 1051 *error_msg = "No image space for verification against"; 1052 return false; 1053 } 1054 1055 // If the requested instruction set is the same as the current runtime, 1056 // we can use the checksums directly. If it isn't, we'll have to read the 1057 // image header from the image for the right instruction set. 1058 uint32_t image_oat_checksum = 0; 1059 uintptr_t image_oat_data_begin = 0; 1060 int32_t image_patch_delta = 0; 1061 if (instruction_set == Runtime::Current()->GetInstructionSet()) { 1062 const ImageHeader& image_header = image_space->GetImageHeader(); 1063 image_oat_checksum = image_header.GetOatChecksum(); 1064 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1065 image_patch_delta = image_header.GetPatchDelta(); 1066 } else { 1067 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1068 image_space->GetImageLocation().c_str(), instruction_set)); 1069 image_oat_checksum = image_header->GetOatChecksum(); 1070 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1071 image_patch_delta = image_header->GetPatchDelta(); 1072 } 1073 const OatHeader& oat_header = oat_file->GetOatHeader(); 1074 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1075 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1076 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1077 if (!ret) { 1078 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1079 oat_file->GetLocation().c_str(), 1080 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1081 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1082 oat_file->GetOatHeader().GetImagePatchDelta(), 1083 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1084 } 1085 return ret; 1086} 1087 1088bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1089 const char* dex_location, 1090 uint32_t dex_location_checksum, 1091 const InstructionSet instruction_set, 1092 std::string* error_msg) { 1093 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1094 return false; 1095 } 1096 1097 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1098 &dex_location_checksum); 1099 if (oat_dex_file == NULL) { 1100 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1101 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1102 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 1103 for (size_t i = 0; i < oat_dex_files.size(); i++) { 1104 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 1105 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 1106 oat_file->GetLocation().c_str(), 1107 oat_dex_file->GetDexFileLocation().c_str()); 1108 } 1109 return false; 1110 } 1111 1112 if (dex_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) { 1113 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1114 oat_file->GetLocation().c_str(), 1115 oat_dex_file->GetDexFileLocationChecksum(), 1116 dex_location, dex_location_checksum); 1117 return false; 1118 } 1119 return true; 1120} 1121 1122bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1123 const char* dex_location, 1124 std::string* error_msg) { 1125 CHECK(oat_file != nullptr); 1126 CHECK(dex_location != nullptr); 1127 std::unique_ptr<const DexFile> dex_file; 1128 uint32_t dex_location_checksum; 1129 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 1130 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1131 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1132 // directory. 1133 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1134 if (oat_dex_file == nullptr) { 1135 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1136 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1137 error_msg->c_str()); 1138 return false; 1139 } 1140 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1141 } else { 1142 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, dex_location_checksum, 1143 kRuntimeISA, error_msg); 1144 if (!verified) { 1145 return false; 1146 } 1147 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1148 &dex_location_checksum)->OpenDexFile(error_msg)); 1149 } 1150 return dex_file.get() != nullptr; 1151} 1152 1153const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1154 const char* dex_location, 1155 const uint32_t* const dex_location_checksum, 1156 InstructionSet isa, 1157 std::vector<std::string>* error_msgs, 1158 bool* obsolete_file_cleanup_failed) { 1159 *obsolete_file_cleanup_failed = false; 1160 bool already_opened = false; 1161 std::string dex_location_str(dex_location); 1162 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1163 &already_opened, 1164 obsolete_file_cleanup_failed, 1165 error_msgs)); 1166 std::string error_msg; 1167 if (oat_file.get() == nullptr) { 1168 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1169 dex_location)); 1170 return nullptr; 1171 } else if (oat_file->IsExecutable() && 1172 !VerifyOatWithDexFile(oat_file.get(), dex_location, &error_msg)) { 1173 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1174 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1175 error_msg.c_str())); 1176 return nullptr; 1177 } else if (!oat_file->IsExecutable() && 1178 Runtime::Current()->GetHeap()->HasImageSpace() && 1179 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1180 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1181 "dex location '%s'. Image checksum incorrect.", 1182 oat_file->GetLocation().c_str(), dex_location)); 1183 return nullptr; 1184 } else { 1185 return oat_file.release(); 1186 } 1187} 1188 1189const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1190 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1191 for (size_t i = 0; i < oat_files_.size(); i++) { 1192 const OatFile* oat_file = oat_files_[i]; 1193 DCHECK(oat_file != nullptr); 1194 if (oat_file->GetLocation() == oat_location) { 1195 return oat_file; 1196 } 1197 } 1198 return nullptr; 1199} 1200 1201const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1202 InstructionSet isa, 1203 bool *already_opened, 1204 bool *obsolete_file_cleanup_failed, 1205 std::vector<std::string>* error_msgs) { 1206 // Find out if we've already opened the file 1207 const OatFile* ret = nullptr; 1208 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1209 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1210 if (ret != nullptr) { 1211 *already_opened = true; 1212 return ret; 1213 } 1214 1215 std::string dalvik_cache; 1216 bool have_android_data = false; 1217 bool have_dalvik_cache = false; 1218 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1219 &have_android_data, &have_dalvik_cache); 1220 std::string cache_filename; 1221 if (have_dalvik_cache) { 1222 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1223 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1224 if (ret != nullptr) { 1225 *already_opened = true; 1226 return ret; 1227 } 1228 } else { 1229 // If we need to relocate we should just place odex back where it started. 1230 cache_filename = odex_filename; 1231 } 1232 1233 ret = nullptr; 1234 1235 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1236 // 1237 // Now we do the following: 1238 // 1) Try and open the odex version 1239 // 2) If present, checksum-verified & relocated correctly return it 1240 // 3) Close the odex version to free up its address space. 1241 // 4) Try and open the cache version 1242 // 5) If present, checksum-verified & relocated correctly return it 1243 // 6) Close the cache version to free up its address space. 1244 // 7) If we should relocate: 1245 // a) If we have opened and checksum-verified the odex version relocate it to 1246 // 'cache_filename' and return it 1247 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1248 // it. This should not happen often (I think only the run-test's will hit this case). 1249 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1250 // this point. 1251 // 9) Return nullptr 1252 1253 *already_opened = false; 1254 const Runtime* runtime = Runtime::Current(); 1255 CHECK(runtime != nullptr); 1256 bool executable = !runtime->IsCompiler(); 1257 1258 std::string odex_error_msg; 1259 bool should_patch_system = false; 1260 bool odex_checksum_verified = false; 1261 bool have_system_odex = false; 1262 { 1263 // There is a high probability that these both these oat files map similar/the same address 1264 // spaces so we must scope them like this so they each gets its turn. 1265 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, NULL, 1266 executable, &odex_error_msg)); 1267 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1268 &odex_checksum_verified, 1269 &odex_error_msg)) { 1270 error_msgs->push_back(odex_error_msg); 1271 return odex_oat_file.release(); 1272 } else { 1273 if (odex_checksum_verified) { 1274 // We can just relocate 1275 should_patch_system = true; 1276 odex_error_msg = "Image Patches are incorrect"; 1277 } 1278 if (odex_oat_file.get() != nullptr) { 1279 have_system_odex = true; 1280 } 1281 } 1282 } 1283 1284 std::string cache_error_msg; 1285 bool should_patch_cache = false; 1286 bool cache_checksum_verified = false; 1287 if (have_dalvik_cache) { 1288 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, NULL, 1289 executable, &cache_error_msg)); 1290 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1291 &cache_checksum_verified, 1292 &cache_error_msg)) { 1293 error_msgs->push_back(cache_error_msg); 1294 return cache_oat_file.release(); 1295 } else if (cache_checksum_verified) { 1296 // We can just relocate 1297 should_patch_cache = true; 1298 cache_error_msg = "Image Patches are incorrect"; 1299 } 1300 } else if (have_android_data) { 1301 // dalvik_cache does not exist but android data does. This means we should be able to create 1302 // it, so we should try. 1303 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1304 } 1305 1306 ret = nullptr; 1307 std::string error_msg; 1308 if (runtime->CanRelocate()) { 1309 // Run relocation 1310 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1311 if (space != nullptr) { 1312 const std::string& image_location = space->GetImageLocation(); 1313 if (odex_checksum_verified && should_patch_system) { 1314 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1315 } else if (cache_checksum_verified && should_patch_cache) { 1316 CHECK(have_dalvik_cache); 1317 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1318 } 1319 } else if (have_system_odex) { 1320 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1321 } 1322 } 1323 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1324 // implicitly: were able to fine where the cached version is but we were unable to use it, 1325 // either as a destination for relocation or to open a file. We should delete it if it is 1326 // there. 1327 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1328 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1329 "searching for dex file %s: %s", 1330 cache_filename.c_str(), dex_location.c_str(), 1331 strerror(errno)); 1332 error_msgs->push_back(rm_error_msg); 1333 VLOG(class_linker) << rm_error_msg; 1334 // Let the caller know that we couldn't remove the obsolete file. 1335 // This is a good indication that further writes may fail as well. 1336 *obsolete_file_cleanup_failed = true; 1337 } 1338 } 1339 if (ret == nullptr) { 1340 VLOG(class_linker) << error_msg; 1341 error_msgs->push_back(error_msg); 1342 std::string relocation_msg; 1343 if (runtime->CanRelocate()) { 1344 relocation_msg = StringPrintf(" and relocation failed"); 1345 } 1346 if (have_dalvik_cache && cache_checksum_verified) { 1347 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1348 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1349 cache_filename.c_str(), cache_error_msg.c_str(), 1350 relocation_msg.c_str()); 1351 } else { 1352 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1353 "dalvik_cache availible)%s.", odex_filename.c_str(), 1354 odex_error_msg.c_str(), relocation_msg.c_str()); 1355 } 1356 VLOG(class_linker) << error_msg; 1357 error_msgs->push_back(error_msg); 1358 } 1359 return ret; 1360} 1361 1362const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1363 InstructionSet isa, 1364 std::string* error_msg) { 1365 // We open it non-executable 1366 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, NULL, false, error_msg)); 1367 if (output.get() == nullptr) { 1368 return nullptr; 1369 } 1370 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1371 VerifyOatImageChecksum(output.get(), isa)) { 1372 return output.release(); 1373 } else { 1374 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1375 oat_path.c_str()); 1376 return nullptr; 1377 } 1378} 1379 1380const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1381 const std::string& output_oat, 1382 const std::string& image_location, 1383 InstructionSet isa, 1384 std::string* error_msg) { 1385 if (!Runtime::Current()->GetHeap()->HasImageSpace()) { 1386 // We don't have an image space so there is no point in trying to patchoat. 1387 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1388 << "running without an image. Attempting to use oat file for interpretation."; 1389 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1390 } 1391 if (!Runtime::Current()->IsDex2OatEnabled()) { 1392 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1393 // input_oat but make sure we only do interpretation on it's dex files. 1394 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1395 << "disabled. Attempting to use oat file for interpretation"; 1396 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1397 } 1398 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1399 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1400 1401 std::string isa_arg("--instruction-set="); 1402 isa_arg += GetInstructionSetString(isa); 1403 std::string input_oat_filename_arg("--input-oat-file="); 1404 input_oat_filename_arg += input_oat; 1405 std::string output_oat_filename_arg("--output-oat-file="); 1406 output_oat_filename_arg += output_oat; 1407 std::string patched_image_arg("--patched-image-location="); 1408 patched_image_arg += image_location; 1409 1410 std::vector<std::string> argv; 1411 argv.push_back(patchoat); 1412 argv.push_back(isa_arg); 1413 argv.push_back(input_oat_filename_arg); 1414 argv.push_back(output_oat_filename_arg); 1415 argv.push_back(patched_image_arg); 1416 1417 std::string command_line(Join(argv, ' ')); 1418 LOG(INFO) << "Relocate Oat File: " << command_line; 1419 bool success = Exec(argv, error_msg); 1420 if (success) { 1421 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, NULL, 1422 !Runtime::Current()->IsCompiler(), error_msg)); 1423 bool checksum_verified = false; 1424 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1425 return output.release(); 1426 } else if (output.get() != nullptr) { 1427 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1428 "but output file '%s' failed verifcation: %s", 1429 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1430 } else { 1431 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1432 "but was unable to open output file '%s': %s", 1433 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1434 } 1435 } else if (!Runtime::Current()->IsCompiler()) { 1436 // patchoat failed which means we probably don't have enough room to place the output oat file, 1437 // instead of failing we should just run the interpreter from the dex files in the input oat. 1438 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1439 << "for interpretation. patchoat failure was: " << *error_msg; 1440 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1441 } else { 1442 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1443 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1444 error_msg->c_str()); 1445 } 1446 return nullptr; 1447} 1448 1449int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1450 Runtime* runtime = Runtime::Current(); 1451 int32_t real_patch_delta; 1452 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1453 CHECK(image_space != nullptr); 1454 if (isa == Runtime::Current()->GetInstructionSet()) { 1455 const ImageHeader& image_header = image_space->GetImageHeader(); 1456 real_patch_delta = image_header.GetPatchDelta(); 1457 } else { 1458 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1459 image_space->GetImageLocation().c_str(), isa)); 1460 real_patch_delta = image_header->GetPatchDelta(); 1461 } 1462 const OatHeader& oat_header = oat_file->GetOatHeader(); 1463 return real_patch_delta - oat_header.GetImagePatchDelta(); 1464} 1465 1466bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1467 bool* checksum_verified, 1468 std::string* error_msg) { 1469 std::string compound_msg("Oat file failed to verify: "); 1470 Runtime* runtime = Runtime::Current(); 1471 uint32_t real_image_checksum; 1472 void* real_image_oat_offset; 1473 int32_t real_patch_delta; 1474 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1475 if (image_space == nullptr) { 1476 *error_msg = "No image space present"; 1477 return false; 1478 } 1479 if (isa == Runtime::Current()->GetInstructionSet()) { 1480 const ImageHeader& image_header = image_space->GetImageHeader(); 1481 real_image_checksum = image_header.GetOatChecksum(); 1482 real_image_oat_offset = image_header.GetOatDataBegin(); 1483 real_patch_delta = image_header.GetPatchDelta(); 1484 } else { 1485 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1486 image_space->GetImageLocation().c_str(), isa)); 1487 real_image_checksum = image_header->GetOatChecksum(); 1488 real_image_oat_offset = image_header->GetOatDataBegin(); 1489 real_patch_delta = image_header->GetPatchDelta(); 1490 } 1491 1492 const OatHeader& oat_header = oat_file->GetOatHeader(); 1493 1494 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1495 *checksum_verified = oat_image_checksum == real_image_checksum; 1496 if (!*checksum_verified) { 1497 compound_msg += StringPrintf(" Oat Image Checksum Incorrect (expected 0x%x, recieved 0x%x)", 1498 real_image_checksum, oat_image_checksum); 1499 } 1500 1501 void* oat_image_oat_offset = 1502 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1503 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1504 if (!offset_verified) { 1505 compound_msg += StringPrintf(" Oat Image oat offset incorrect (expected 0x%p, recieved 0x%p)", 1506 real_image_oat_offset, oat_image_oat_offset); 1507 } 1508 1509 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1510 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1511 if (!patch_delta_verified) { 1512 compound_msg += StringPrintf(" Oat image patch delta incorrect (expected 0x%x, recieved 0x%x)", 1513 real_patch_delta, oat_patch_delta); 1514 } 1515 1516 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1517 if (ret) { 1518 *error_msg = compound_msg; 1519 } 1520 return ret; 1521} 1522 1523const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1524 std::string* error_msg) { 1525 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1526 if (oat_file != nullptr) { 1527 return oat_file; 1528 } 1529 1530 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1531 error_msg); 1532 if (oat_file == NULL) { 1533 return NULL; 1534 } 1535 return oat_file; 1536} 1537 1538static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1539 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1540 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1541 1542 DCHECK(obj != NULL); 1543 DCHECK(class_linker != NULL); 1544 1545 if (obj->IsArtMethod()) { 1546 mirror::ArtMethod* method = obj->AsArtMethod(); 1547 if (!method->IsNative()) { 1548 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1549 if (method != Runtime::Current()->GetResolutionMethod()) { 1550 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1551 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1552 } 1553 } 1554 } 1555} 1556 1557void ClassLinker::InitFromImage() { 1558 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1559 CHECK(!init_done_); 1560 1561 Thread* self = Thread::Current(); 1562 gc::Heap* heap = Runtime::Current()->GetHeap(); 1563 gc::space::ImageSpace* space = heap->GetImageSpace(); 1564 dex_cache_image_class_lookup_required_ = true; 1565 CHECK(space != NULL); 1566 OatFile& oat_file = GetImageOatFile(space); 1567 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1568 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1569 const char* image_file_location = oat_file.GetOatHeader(). 1570 GetStoreValueByKey(OatHeader::kImageLocationKey); 1571 CHECK(image_file_location == nullptr || *image_file_location == 0); 1572 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1573 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1574 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1575 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1576 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1577 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1578 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1579 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1580 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1581 1582 StackHandleScope<1> hs(self); 1583 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1584 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1585 AsObjectArray<mirror::Class>())); 1586 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1587 1588 // Special case of setting up the String class early so that we can test arbitrary objects 1589 // as being Strings or not 1590 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1591 1592 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1593 static_cast<uint32_t>(dex_caches->GetLength())); 1594 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1595 StackHandleScope<1> hs(self); 1596 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1597 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1598 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1599 nullptr); 1600 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1601 std::string error_msg; 1602 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1603 if (dex_file == NULL) { 1604 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1605 << " from within oat file " << oat_file.GetLocation() 1606 << " error '" << error_msg << "'"; 1607 } 1608 1609 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1610 1611 AppendToBootClassPath(*dex_file, dex_cache); 1612 } 1613 1614 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1615 // bitmap walk. 1616 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1617 1618 // Set entry point to interpreter if in InterpretOnly mode. 1619 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1620 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1621 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1622 } 1623 1624 // reinit class_roots_ 1625 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1626 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1627 1628 // reinit array_iftable_ from any array class instance, they should be == 1629 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1630 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1631 // String class root was set above 1632 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1633 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1634 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1635 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1636 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1637 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1638 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1639 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1640 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1641 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1642 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1643 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1644 1645 FinishInit(self); 1646 1647 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1648} 1649 1650void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1651 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1652 if ((flags & kVisitRootFlagAllRoots) != 0) { 1653 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1654 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1655 } 1656 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1657 for (auto& pair : new_class_roots_) { 1658 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1659 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1660 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1661 if (UNLIKELY(new_ref != old_ref)) { 1662 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1663 // corresponding object. This is slow, but luckily for us, this may only happen with a 1664 // concurrent moving GC. 1665 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1666 it != end && it->first == pair.first; ++it) { 1667 // If the class stored matches the old class, update it to the new value. 1668 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1669 it->second = GcRoot<mirror::Class>(new_ref); 1670 } 1671 } 1672 } 1673 } 1674 } 1675 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1676 new_class_roots_.clear(); 1677 } 1678 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1679 log_new_class_table_roots_ = true; 1680 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1681 log_new_class_table_roots_ = false; 1682 } 1683 // We deliberately ignore the class roots in the image since we 1684 // handle image roots by using the MS/CMS rescanning of dirty cards. 1685} 1686 1687// Keep in sync with InitCallback. Anything we visit, we need to 1688// reinit references to when reinitializing a ClassLinker from a 1689// mapped image. 1690void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1691 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1692 Thread* self = Thread::Current(); 1693 { 1694 ReaderMutexLock mu(self, dex_lock_); 1695 if ((flags & kVisitRootFlagAllRoots) != 0) { 1696 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1697 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1698 } 1699 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1700 for (size_t index : new_dex_cache_roots_) { 1701 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1702 } 1703 } 1704 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1705 new_dex_cache_roots_.clear(); 1706 } 1707 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1708 log_new_dex_caches_roots_ = true; 1709 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1710 log_new_dex_caches_roots_ = false; 1711 } 1712 } 1713 VisitClassRoots(callback, arg, flags); 1714 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1715 DCHECK(!array_iftable_.IsNull()); 1716 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1717 if (!find_array_class_cache_[i].IsNull()) { 1718 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1719 } 1720 } 1721} 1722 1723void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1724 if (dex_cache_image_class_lookup_required_) { 1725 MoveImageClassesToClassTable(); 1726 } 1727 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1728 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1729 mirror::Class* c = it.second.Read(); 1730 if (!visitor(c, arg)) { 1731 return; 1732 } 1733 } 1734} 1735 1736static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1737 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1738 classes->insert(c); 1739 return true; 1740} 1741 1742void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1743 std::set<mirror::Class*> classes; 1744 VisitClasses(GetClassesVisitor, &classes); 1745 for (mirror::Class* klass : classes) { 1746 if (!visitor(klass, arg)) { 1747 return; 1748 } 1749 } 1750} 1751 1752ClassLinker::~ClassLinker() { 1753 mirror::Class::ResetClass(); 1754 mirror::String::ResetClass(); 1755 mirror::Reference::ResetClass(); 1756 mirror::ArtField::ResetClass(); 1757 mirror::ArtMethod::ResetClass(); 1758 mirror::BooleanArray::ResetArrayClass(); 1759 mirror::ByteArray::ResetArrayClass(); 1760 mirror::CharArray::ResetArrayClass(); 1761 mirror::DoubleArray::ResetArrayClass(); 1762 mirror::FloatArray::ResetArrayClass(); 1763 mirror::IntArray::ResetArrayClass(); 1764 mirror::LongArray::ResetArrayClass(); 1765 mirror::ShortArray::ResetArrayClass(); 1766 mirror::Throwable::ResetClass(); 1767 mirror::StackTraceElement::ResetClass(); 1768 STLDeleteElements(&boot_class_path_); 1769 STLDeleteElements(&oat_files_); 1770} 1771 1772mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1773 gc::Heap* heap = Runtime::Current()->GetHeap(); 1774 StackHandleScope<16> hs(self); 1775 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1776 Handle<mirror::DexCache> dex_cache( 1777 hs.NewHandle(down_cast<mirror::DexCache*>( 1778 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1779 VoidFunctor())))); 1780 if (dex_cache.Get() == NULL) { 1781 return NULL; 1782 } 1783 Handle<mirror::String> 1784 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1785 if (location.Get() == NULL) { 1786 return NULL; 1787 } 1788 Handle<mirror::ObjectArray<mirror::String>> 1789 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1790 if (strings.Get() == NULL) { 1791 return NULL; 1792 } 1793 Handle<mirror::ObjectArray<mirror::Class>> 1794 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1795 if (types.Get() == NULL) { 1796 return NULL; 1797 } 1798 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1799 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1800 if (methods.Get() == NULL) { 1801 return NULL; 1802 } 1803 Handle<mirror::ObjectArray<mirror::ArtField>> 1804 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1805 if (fields.Get() == NULL) { 1806 return NULL; 1807 } 1808 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1809 fields.Get()); 1810 return dex_cache.Get(); 1811} 1812 1813mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1814 uint32_t class_size) { 1815 DCHECK_GE(class_size, sizeof(mirror::Class)); 1816 gc::Heap* heap = Runtime::Current()->GetHeap(); 1817 mirror::Class::InitializeClassVisitor visitor(class_size); 1818 mirror::Object* k = kMovingClasses ? 1819 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1820 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1821 if (UNLIKELY(k == nullptr)) { 1822 CHECK(self->IsExceptionPending()); // OOME. 1823 return nullptr; 1824 } 1825 return k->AsClass(); 1826} 1827 1828mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1829 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1830} 1831 1832mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1833 return down_cast<mirror::ArtField*>( 1834 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1835} 1836 1837mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1838 return down_cast<mirror::ArtMethod*>( 1839 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1840} 1841 1842mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1843 Thread* self, size_t length) { 1844 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1845 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1846} 1847 1848mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1849 mirror::Class* klass) { 1850 DCHECK(klass != NULL); 1851 1852 // For temporary classes we must wait for them to be retired. 1853 if (init_done_ && klass->IsTemp()) { 1854 CHECK(!klass->IsResolved()); 1855 if (klass->IsErroneous()) { 1856 ThrowEarlierClassFailure(klass); 1857 return nullptr; 1858 } 1859 StackHandleScope<1> hs(self); 1860 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1861 ObjectLock<mirror::Class> lock(self, h_class); 1862 // Loop and wait for the resolving thread to retire this class. 1863 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1864 lock.WaitIgnoringInterrupts(); 1865 } 1866 if (h_class->IsErroneous()) { 1867 ThrowEarlierClassFailure(h_class.Get()); 1868 return nullptr; 1869 } 1870 CHECK(h_class->IsRetired()); 1871 // Get the updated class from class table. 1872 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1873 } 1874 1875 // Wait for the class if it has not already been linked. 1876 if (!klass->IsResolved() && !klass->IsErroneous()) { 1877 StackHandleScope<1> hs(self); 1878 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1879 ObjectLock<mirror::Class> lock(self, h_class); 1880 // Check for circular dependencies between classes. 1881 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1882 ThrowClassCircularityError(h_class.Get()); 1883 h_class->SetStatus(mirror::Class::kStatusError, self); 1884 return nullptr; 1885 } 1886 // Wait for the pending initialization to complete. 1887 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1888 lock.WaitIgnoringInterrupts(); 1889 } 1890 } 1891 1892 if (klass->IsErroneous()) { 1893 ThrowEarlierClassFailure(klass); 1894 return nullptr; 1895 } 1896 // Return the loaded class. No exceptions should be pending. 1897 CHECK(klass->IsResolved()) << PrettyClass(klass); 1898 self->AssertNoPendingException(); 1899 return klass; 1900} 1901 1902typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry; 1903 1904// Search a collection of DexFiles for a descriptor 1905ClassPathEntry FindInClassPath(const char* descriptor, 1906 const std::vector<const DexFile*>& class_path) { 1907 for (size_t i = 0; i != class_path.size(); ++i) { 1908 const DexFile* dex_file = class_path[i]; 1909 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 1910 if (dex_class_def != NULL) { 1911 return ClassPathEntry(dex_file, dex_class_def); 1912 } 1913 } 1914 // TODO: remove reinterpret_cast when issue with -std=gnu++0x host issue resolved 1915 return ClassPathEntry(reinterpret_cast<const DexFile*>(NULL), 1916 reinterpret_cast<const DexFile::ClassDef*>(NULL)); 1917} 1918 1919mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1920 Handle<mirror::ClassLoader> class_loader) { 1921 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1922 DCHECK(self != nullptr); 1923 self->AssertNoPendingException(); 1924 if (descriptor[1] == '\0') { 1925 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1926 // for primitive classes that aren't backed by dex files. 1927 return FindPrimitiveClass(descriptor[0]); 1928 } 1929 // Find the class in the loaded classes table. 1930 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1931 if (klass != nullptr) { 1932 return EnsureResolved(self, descriptor, klass); 1933 } 1934 // Class is not yet loaded. 1935 if (descriptor[0] == '[') { 1936 return CreateArrayClass(self, descriptor, class_loader); 1937 } else if (class_loader.Get() == nullptr) { 1938 // The boot class loader, search the boot class path. 1939 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 1940 if (pair.second != nullptr) { 1941 StackHandleScope<1> hs(self); 1942 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1943 } else { 1944 // The boot class loader is searched ahead of the application class loader, failures are 1945 // expected and will be wrapped in a ClassNotFoundException. Use the pre-allocated error to 1946 // trigger the chaining with a proper stack trace. 1947 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 1948 self->SetException(ThrowLocation(), pre_allocated); 1949 return nullptr; 1950 } 1951 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1952 // First try with the bootstrap class loader. 1953 if (class_loader.Get() != nullptr) { 1954 klass = LookupClass(descriptor, nullptr); 1955 if (klass != nullptr) { 1956 return EnsureResolved(self, descriptor, klass); 1957 } 1958 } 1959 // If the lookup failed search the boot class path. We don't perform a recursive call to avoid 1960 // a NoClassDefFoundError being allocated. 1961 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 1962 if (pair.second != nullptr) { 1963 StackHandleScope<1> hs(self); 1964 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1965 } 1966 // Next try the compile time class path. 1967 const std::vector<const DexFile*>* class_path; 1968 { 1969 ScopedObjectAccessUnchecked soa(self); 1970 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1971 soa.AddLocalReference<jobject>(class_loader.Get())); 1972 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1973 } 1974 pair = FindInClassPath(descriptor, *class_path); 1975 if (pair.second != nullptr) { 1976 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1977 } 1978 } else { 1979 ScopedObjectAccessUnchecked soa(self); 1980 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1981 soa.AddLocalReference<jobject>(class_loader.Get())); 1982 std::string class_name_string(DescriptorToDot(descriptor)); 1983 ScopedLocalRef<jobject> result(soa.Env(), nullptr); 1984 { 1985 ScopedThreadStateChange tsc(self, kNative); 1986 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1987 soa.Env()->NewStringUTF(class_name_string.c_str())); 1988 if (class_name_object.get() == nullptr) { 1989 DCHECK(self->IsExceptionPending()); // OOME. 1990 return nullptr; 1991 } 1992 CHECK(class_loader_object.get() != nullptr); 1993 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1994 WellKnownClasses::java_lang_ClassLoader_loadClass, 1995 class_name_object.get())); 1996 } 1997 if (self->IsExceptionPending()) { 1998 // If the ClassLoader threw, pass that exception up. 1999 return nullptr; 2000 } else if (result.get() == nullptr) { 2001 // broken loader - throw NPE to be compatible with Dalvik 2002 ThrowNullPointerException(nullptr, StringPrintf("ClassLoader.loadClass returned null for %s", 2003 class_name_string.c_str()).c_str()); 2004 return nullptr; 2005 } else { 2006 // success, return mirror::Class* 2007 return soa.Decode<mirror::Class*>(result.get()); 2008 } 2009 } 2010 2011 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 2012 return nullptr; 2013} 2014 2015mirror::Class* ClassLinker::DefineClass(const char* descriptor, 2016 Handle<mirror::ClassLoader> class_loader, 2017 const DexFile& dex_file, 2018 const DexFile::ClassDef& dex_class_def) { 2019 Thread* self = Thread::Current(); 2020 StackHandleScope<3> hs(self); 2021 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2022 bool should_allocate = false; 2023 2024 // Load the class from the dex file. 2025 if (UNLIKELY(!init_done_)) { 2026 // finish up init of hand crafted class_roots_ 2027 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2028 klass.Assign(GetClassRoot(kJavaLangObject)); 2029 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2030 klass.Assign(GetClassRoot(kJavaLangClass)); 2031 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2032 klass.Assign(GetClassRoot(kJavaLangString)); 2033 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2034 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2035 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2036 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2037 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2038 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2039 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2040 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2041 } else { 2042 should_allocate = true; 2043 } 2044 } else { 2045 should_allocate = true; 2046 } 2047 2048 if (should_allocate) { 2049 // Allocate a class with the status of not ready. 2050 // Interface object should get the right size here. Regular class will 2051 // figure out the right size later and be replaced with one of the right 2052 // size when the class becomes resolved. 2053 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2054 } 2055 if (UNLIKELY(klass.Get() == nullptr)) { 2056 CHECK(self->IsExceptionPending()); // Expect an OOME. 2057 return nullptr; 2058 } 2059 klass->SetDexCache(FindDexCache(dex_file)); 2060 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 2061 ObjectLock<mirror::Class> lock(self, klass); 2062 if (self->IsExceptionPending()) { 2063 // An exception occured during load, set status to erroneous while holding klass' lock in case 2064 // notification is necessary. 2065 if (!klass->IsErroneous()) { 2066 klass->SetStatus(mirror::Class::kStatusError, self); 2067 } 2068 return nullptr; 2069 } 2070 klass->SetClinitThreadId(self->GetTid()); 2071 2072 // Add the newly loaded class to the loaded classes table. 2073 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 2074 if (existing != nullptr) { 2075 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2076 // this thread to block. 2077 return EnsureResolved(self, descriptor, existing); 2078 } 2079 2080 // Finish loading (if necessary) by finding parents 2081 CHECK(!klass->IsLoaded()); 2082 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2083 // Loading failed. 2084 if (!klass->IsErroneous()) { 2085 klass->SetStatus(mirror::Class::kStatusError, self); 2086 } 2087 return nullptr; 2088 } 2089 CHECK(klass->IsLoaded()); 2090 // Link the class (if necessary) 2091 CHECK(!klass->IsResolved()); 2092 // TODO: Use fast jobjects? 2093 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2094 2095 mirror::Class* new_class = nullptr; 2096 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2097 // Linking failed. 2098 if (!klass->IsErroneous()) { 2099 klass->SetStatus(mirror::Class::kStatusError, self); 2100 } 2101 return nullptr; 2102 } 2103 self->AssertNoPendingException(); 2104 CHECK(new_class != nullptr) << descriptor; 2105 CHECK(new_class->IsResolved()) << descriptor; 2106 2107 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2108 2109 /* 2110 * We send CLASS_PREPARE events to the debugger from here. The 2111 * definition of "preparation" is creating the static fields for a 2112 * class and initializing them to the standard default values, but not 2113 * executing any code (that comes later, during "initialization"). 2114 * 2115 * We did the static preparation in LinkClass. 2116 * 2117 * The class has been prepared and resolved but possibly not yet verified 2118 * at this point. 2119 */ 2120 Dbg::PostClassPrepare(new_class_h.Get()); 2121 2122 return new_class_h.Get(); 2123} 2124 2125uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2126 const DexFile::ClassDef& dex_class_def) { 2127 const byte* class_data = dex_file.GetClassData(dex_class_def); 2128 size_t num_ref = 0; 2129 size_t num_32 = 0; 2130 size_t num_64 = 0; 2131 if (class_data != NULL) { 2132 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2133 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2134 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2135 char c = descriptor[0]; 2136 if (c == 'L' || c == '[') { 2137 num_ref++; 2138 } else if (c == 'J' || c == 'D') { 2139 num_64++; 2140 } else { 2141 num_32++; 2142 } 2143 } 2144 } 2145 return mirror::Class::ComputeClassSize(false, 0, num_32, num_64, num_ref); 2146} 2147 2148bool ClassLinker::FindOatClass(const DexFile& dex_file, 2149 uint16_t class_def_idx, 2150 OatFile::OatClass* oat_class) { 2151 DCHECK(oat_class != nullptr); 2152 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2153 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2154 if (oat_file == nullptr) { 2155 return false; 2156 } 2157 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2158 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2159 &dex_location_checksum); 2160 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 2161 *oat_class = oat_dex_file->GetOatClass(class_def_idx); 2162 return true; 2163} 2164 2165static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2166 uint32_t method_idx) { 2167 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2168 const byte* class_data = dex_file.GetClassData(class_def); 2169 CHECK(class_data != NULL); 2170 ClassDataItemIterator it(dex_file, class_data); 2171 // Skip fields 2172 while (it.HasNextStaticField()) { 2173 it.Next(); 2174 } 2175 while (it.HasNextInstanceField()) { 2176 it.Next(); 2177 } 2178 // Process methods 2179 size_t class_def_method_index = 0; 2180 while (it.HasNextDirectMethod()) { 2181 if (it.GetMemberIndex() == method_idx) { 2182 return class_def_method_index; 2183 } 2184 class_def_method_index++; 2185 it.Next(); 2186 } 2187 while (it.HasNextVirtualMethod()) { 2188 if (it.GetMemberIndex() == method_idx) { 2189 return class_def_method_index; 2190 } 2191 class_def_method_index++; 2192 it.Next(); 2193 } 2194 DCHECK(!it.HasNext()); 2195 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2196 return 0; 2197} 2198 2199bool ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, OatFile::OatMethod* oat_method) { 2200 DCHECK(oat_method != nullptr); 2201 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2202 // method for direct methods (or virtual methods made direct). 2203 mirror::Class* declaring_class = method->GetDeclaringClass(); 2204 size_t oat_method_index; 2205 if (method->IsStatic() || method->IsDirect()) { 2206 // Simple case where the oat method index was stashed at load time. 2207 oat_method_index = method->GetMethodIndex(); 2208 } else { 2209 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2210 // by search for its position in the declared virtual methods. 2211 oat_method_index = declaring_class->NumDirectMethods(); 2212 size_t end = declaring_class->NumVirtualMethods(); 2213 bool found = false; 2214 for (size_t i = 0; i < end; i++) { 2215 if (declaring_class->GetVirtualMethod(i) == method) { 2216 found = true; 2217 break; 2218 } 2219 oat_method_index++; 2220 } 2221 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2222 } 2223 DCHECK_EQ(oat_method_index, 2224 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2225 method->GetDeclaringClass()->GetDexClassDefIndex(), 2226 method->GetDexMethodIndex())); 2227 OatFile::OatClass oat_class; 2228 if (!FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2229 declaring_class->GetDexClassDefIndex(), 2230 &oat_class)) { 2231 return false; 2232 } 2233 2234 *oat_method = oat_class.GetOatMethod(oat_method_index); 2235 return true; 2236} 2237 2238// Special case to get oat code without overwriting a trampoline. 2239const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2240 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2241 if (method->IsProxyMethod()) { 2242 return GetQuickProxyInvokeHandler(); 2243 } 2244 OatFile::OatMethod oat_method; 2245 const void* result = nullptr; 2246 if (FindOatMethodFor(method, &oat_method)) { 2247 result = oat_method.GetQuickCode(); 2248 } 2249 2250 if (result == nullptr) { 2251 if (method->IsNative()) { 2252 // No code and native? Use generic trampoline. 2253 result = GetQuickGenericJniTrampoline(); 2254 } else if (method->IsPortableCompiled()) { 2255 // No code? Do we expect portable code? 2256 result = GetQuickToPortableBridge(); 2257 } else { 2258 // No code? You must mean to go into the interpreter. 2259 result = GetQuickToInterpreterBridge(); 2260 } 2261 } 2262 return result; 2263} 2264 2265const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2266 bool* have_portable_code) { 2267 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2268 *have_portable_code = false; 2269 if (method->IsProxyMethod()) { 2270 return GetPortableProxyInvokeHandler(); 2271 } 2272 OatFile::OatMethod oat_method; 2273 const void* result = nullptr; 2274 const void* quick_code = nullptr; 2275 if (FindOatMethodFor(method, &oat_method)) { 2276 result = oat_method.GetPortableCode(); 2277 quick_code = oat_method.GetQuickCode(); 2278 } 2279 2280 if (result == nullptr) { 2281 if (quick_code == nullptr) { 2282 // No code? You must mean to go into the interpreter. 2283 result = GetPortableToInterpreterBridge(); 2284 } else { 2285 // No code? But there's quick code, so use a bridge. 2286 result = GetPortableToQuickBridge(); 2287 } 2288 } else { 2289 *have_portable_code = true; 2290 } 2291 return result; 2292} 2293 2294const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2295 uint32_t method_idx) { 2296 OatFile::OatClass oat_class; 2297 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2298 return nullptr; 2299 } 2300 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2301 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2302} 2303 2304const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2305 uint32_t method_idx) { 2306 OatFile::OatClass oat_class; 2307 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2308 return nullptr; 2309 } 2310 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2311 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2312} 2313 2314// Returns true if the method must run with interpreter, false otherwise. 2315static bool NeedsInterpreter( 2316 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2317 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2318 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2319 // No code: need interpreter. 2320 // May return true for native code, in the case of generic JNI 2321 // DCHECK(!method->IsNative()); 2322 return true; 2323 } 2324#ifdef ART_SEA_IR_MODE 2325 ScopedObjectAccess soa(Thread::Current()); 2326 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2327 LOG(INFO) << "Found " << PrettyMethod(method); 2328 return false; 2329 } 2330#endif 2331 // If interpreter mode is enabled, every method (except native and proxy) must 2332 // be run with interpreter. 2333 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2334 !method->IsNative() && !method->IsProxyMethod(); 2335} 2336 2337void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2338 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2339 if (klass->NumDirectMethods() == 0) { 2340 return; // No direct methods => no static methods. 2341 } 2342 Runtime* runtime = Runtime::Current(); 2343 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2344 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2345 return; // OAT file unavailable. 2346 } 2347 } 2348 2349 const DexFile& dex_file = klass->GetDexFile(); 2350 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2351 CHECK(dex_class_def != nullptr); 2352 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2353 // There should always be class data if there were direct methods. 2354 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2355 ClassDataItemIterator it(dex_file, class_data); 2356 // Skip fields 2357 while (it.HasNextStaticField()) { 2358 it.Next(); 2359 } 2360 while (it.HasNextInstanceField()) { 2361 it.Next(); 2362 } 2363 OatFile::OatClass oat_class; 2364 bool has_oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class); 2365 // Link the code of methods skipped by LinkCode. 2366 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2367 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2368 if (!method->IsStatic()) { 2369 // Only update static methods. 2370 continue; 2371 } 2372 const void* portable_code = nullptr; 2373 const void* quick_code = nullptr; 2374 if (has_oat_class) { 2375 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2376 portable_code = oat_method.GetPortableCode(); 2377 quick_code = oat_method.GetQuickCode(); 2378 } 2379 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2380 bool have_portable_code = false; 2381 if (enter_interpreter) { 2382 // Use interpreter entry point. 2383 // Check whether the method is native, in which case it's generic JNI. 2384 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2385 quick_code = GetQuickGenericJniTrampoline(); 2386 portable_code = GetPortableToQuickBridge(); 2387 } else { 2388 portable_code = GetPortableToInterpreterBridge(); 2389 quick_code = GetQuickToInterpreterBridge(); 2390 } 2391 } else { 2392 if (portable_code == nullptr) { 2393 portable_code = GetPortableToQuickBridge(); 2394 } else { 2395 have_portable_code = true; 2396 } 2397 if (quick_code == nullptr) { 2398 quick_code = GetQuickToPortableBridge(); 2399 } 2400 } 2401 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2402 have_portable_code); 2403 } 2404 // Ignore virtual methods on the iterator. 2405} 2406 2407void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 2408 const DexFile& dex_file, uint32_t dex_method_index, 2409 uint32_t method_index) { 2410 if (Runtime::Current()->IsCompiler()) { 2411 // The following code only applies to a non-compiler runtime. 2412 return; 2413 } 2414 // Method shouldn't have already been linked. 2415 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2416 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2417 if (oat_class != nullptr) { 2418 // Every kind of method should at least get an invoke stub from the oat_method. 2419 // non-abstract methods also get their code pointers. 2420 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2421 oat_method.LinkMethod(method.Get()); 2422 } 2423 2424 // Install entry point from interpreter. 2425 bool enter_interpreter = NeedsInterpreter(method.Get(), 2426 method->GetEntryPointFromQuickCompiledCode(), 2427 method->GetEntryPointFromPortableCompiledCode()); 2428 if (enter_interpreter && !method->IsNative()) { 2429 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2430 } else { 2431 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2432 } 2433 2434 if (method->IsAbstract()) { 2435 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2436 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2437 return; 2438 } 2439 2440 bool have_portable_code = false; 2441 if (method->IsStatic() && !method->IsConstructor()) { 2442 // For static methods excluding the class initializer, install the trampoline. 2443 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2444 // after initializing class (see ClassLinker::InitializeClass method). 2445 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2446 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2447 } else if (enter_interpreter) { 2448 if (!method->IsNative()) { 2449 // Set entry point from compiled code if there's no code or in interpreter only mode. 2450 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2451 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2452 } else { 2453 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2454 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2455 } 2456 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2457 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2458 have_portable_code = true; 2459 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2460 } else { 2461 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2462 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2463 } 2464 2465 if (method->IsNative()) { 2466 // Unregistering restores the dlsym lookup stub. 2467 method->UnregisterNative(Thread::Current()); 2468 2469 if (enter_interpreter) { 2470 // We have a native method here without code. Then it should have either the GenericJni 2471 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2472 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2473 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2474 } 2475 } 2476 2477 // Allow instrumentation its chance to hijack code. 2478 Runtime* runtime = Runtime::Current(); 2479 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2480 method->GetEntryPointFromQuickCompiledCode(), 2481 method->GetEntryPointFromPortableCompiledCode(), 2482 have_portable_code); 2483} 2484 2485void ClassLinker::LoadClass(const DexFile& dex_file, 2486 const DexFile::ClassDef& dex_class_def, 2487 Handle<mirror::Class> klass, 2488 mirror::ClassLoader* class_loader) { 2489 CHECK(klass.Get() != NULL); 2490 CHECK(klass->GetDexCache() != NULL); 2491 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2492 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2493 CHECK(descriptor != NULL); 2494 2495 klass->SetClass(GetClassRoot(kJavaLangClass)); 2496 if (kUseBakerOrBrooksReadBarrier) { 2497 klass->AssertReadBarrierPointer(); 2498 } 2499 uint32_t access_flags = dex_class_def.access_flags_; 2500 // Make sure that none of our runtime-only flags are set. 2501 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2502 klass->SetAccessFlags(access_flags); 2503 klass->SetClassLoader(class_loader); 2504 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2505 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2506 2507 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2508 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2509 2510 const byte* class_data = dex_file.GetClassData(dex_class_def); 2511 if (class_data == NULL) { 2512 return; // no fields or methods - for example a marker interface 2513 } 2514 2515 OatFile::OatClass oat_class; 2516 if (Runtime::Current()->IsStarted() 2517 && !Runtime::Current()->UseCompileTimeClassPath() 2518 && FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class)) { 2519 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2520 } else { 2521 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2522 } 2523} 2524 2525void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2526 const byte* class_data, 2527 Handle<mirror::Class> klass, 2528 mirror::ClassLoader* class_loader, 2529 const OatFile::OatClass* oat_class) { 2530 // Load fields. 2531 ClassDataItemIterator it(dex_file, class_data); 2532 Thread* self = Thread::Current(); 2533 if (it.NumStaticFields() != 0) { 2534 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2535 if (UNLIKELY(statics == NULL)) { 2536 CHECK(self->IsExceptionPending()); // OOME. 2537 return; 2538 } 2539 klass->SetSFields(statics); 2540 } 2541 if (it.NumInstanceFields() != 0) { 2542 mirror::ObjectArray<mirror::ArtField>* fields = 2543 AllocArtFieldArray(self, it.NumInstanceFields()); 2544 if (UNLIKELY(fields == NULL)) { 2545 CHECK(self->IsExceptionPending()); // OOME. 2546 return; 2547 } 2548 klass->SetIFields(fields); 2549 } 2550 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2551 StackHandleScope<1> hs(self); 2552 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2553 if (UNLIKELY(sfield.Get() == NULL)) { 2554 CHECK(self->IsExceptionPending()); // OOME. 2555 return; 2556 } 2557 klass->SetStaticField(i, sfield.Get()); 2558 LoadField(dex_file, it, klass, sfield); 2559 } 2560 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2561 StackHandleScope<1> hs(self); 2562 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2563 if (UNLIKELY(ifield.Get() == NULL)) { 2564 CHECK(self->IsExceptionPending()); // OOME. 2565 return; 2566 } 2567 klass->SetInstanceField(i, ifield.Get()); 2568 LoadField(dex_file, it, klass, ifield); 2569 } 2570 2571 // Load methods. 2572 if (it.NumDirectMethods() != 0) { 2573 // TODO: append direct methods to class object 2574 mirror::ObjectArray<mirror::ArtMethod>* directs = 2575 AllocArtMethodArray(self, it.NumDirectMethods()); 2576 if (UNLIKELY(directs == NULL)) { 2577 CHECK(self->IsExceptionPending()); // OOME. 2578 return; 2579 } 2580 klass->SetDirectMethods(directs); 2581 } 2582 if (it.NumVirtualMethods() != 0) { 2583 // TODO: append direct methods to class object 2584 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2585 AllocArtMethodArray(self, it.NumVirtualMethods()); 2586 if (UNLIKELY(virtuals == NULL)) { 2587 CHECK(self->IsExceptionPending()); // OOME. 2588 return; 2589 } 2590 klass->SetVirtualMethods(virtuals); 2591 } 2592 size_t class_def_method_index = 0; 2593 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2594 StackHandleScope<1> hs(self); 2595 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2596 if (UNLIKELY(method.Get() == NULL)) { 2597 CHECK(self->IsExceptionPending()); // OOME. 2598 return; 2599 } 2600 klass->SetDirectMethod(i, method.Get()); 2601 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2602 method->SetMethodIndex(class_def_method_index); 2603 class_def_method_index++; 2604 } 2605 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2606 StackHandleScope<1> hs(self); 2607 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2608 if (UNLIKELY(method.Get() == NULL)) { 2609 CHECK(self->IsExceptionPending()); // OOME. 2610 return; 2611 } 2612 klass->SetVirtualMethod(i, method.Get()); 2613 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2614 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2615 class_def_method_index++; 2616 } 2617 DCHECK(!it.HasNext()); 2618} 2619 2620void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2621 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2622 uint32_t field_idx = it.GetMemberIndex(); 2623 dst->SetDexFieldIndex(field_idx); 2624 dst->SetDeclaringClass(klass.Get()); 2625 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2626} 2627 2628mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2629 const ClassDataItemIterator& it, 2630 Handle<mirror::Class> klass) { 2631 uint32_t dex_method_idx = it.GetMemberIndex(); 2632 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2633 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2634 2635 mirror::ArtMethod* dst = AllocArtMethod(self); 2636 if (UNLIKELY(dst == NULL)) { 2637 CHECK(self->IsExceptionPending()); // OOME. 2638 return NULL; 2639 } 2640 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2641 2642 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2643 dst->SetDexMethodIndex(dex_method_idx); 2644 dst->SetDeclaringClass(klass.Get()); 2645 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2646 2647 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2648 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2649 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2650 2651 uint32_t access_flags = it.GetMemberAccessFlags(); 2652 2653 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2654 // Set finalizable flag on declaring class. 2655 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2656 // Void return type. 2657 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged. 2658 klass->SetFinalizable(); 2659 } else { 2660 std::string temp; 2661 const char* klass_descriptor = klass->GetDescriptor(&temp); 2662 // The Enum class declares a "final" finalize() method to prevent subclasses from 2663 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2664 // subclasses, so we exclude it here. 2665 // We also want to avoid setting the flag on Object, where we know that finalize() is 2666 // empty. 2667 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2668 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2669 klass->SetFinalizable(); 2670 } 2671 } 2672 } 2673 } else if (method_name[0] == '<') { 2674 // Fix broken access flags for initializers. Bug 11157540. 2675 bool is_init = (strcmp("<init>", method_name) == 0); 2676 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2677 if (UNLIKELY(!is_init && !is_clinit)) { 2678 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2679 } else { 2680 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2681 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2682 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2683 access_flags |= kAccConstructor; 2684 } 2685 } 2686 } 2687 dst->SetAccessFlags(access_flags); 2688 2689 self->EndAssertNoThreadSuspension(old_cause); 2690 return dst; 2691} 2692 2693void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2694 Thread* self = Thread::Current(); 2695 StackHandleScope<1> hs(self); 2696 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2697 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2698 AppendToBootClassPath(dex_file, dex_cache); 2699} 2700 2701void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2702 Handle<mirror::DexCache> dex_cache) { 2703 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2704 boot_class_path_.push_back(&dex_file); 2705 RegisterDexFile(dex_file, dex_cache); 2706} 2707 2708bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2709 dex_lock_.AssertSharedHeld(Thread::Current()); 2710 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2711 mirror::DexCache* dex_cache = GetDexCache(i); 2712 if (dex_cache->GetDexFile() == &dex_file) { 2713 return true; 2714 } 2715 } 2716 return false; 2717} 2718 2719bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2720 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2721 return IsDexFileRegisteredLocked(dex_file); 2722} 2723 2724void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2725 Handle<mirror::DexCache> dex_cache) { 2726 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2727 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2728 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2729 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2730 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2731 dex_cache->SetDexFile(&dex_file); 2732 if (log_new_dex_caches_roots_) { 2733 // TODO: This is not safe if we can remove dex caches. 2734 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2735 } 2736} 2737 2738void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2739 Thread* self = Thread::Current(); 2740 { 2741 ReaderMutexLock mu(self, dex_lock_); 2742 if (IsDexFileRegisteredLocked(dex_file)) { 2743 return; 2744 } 2745 } 2746 // Don't alloc while holding the lock, since allocation may need to 2747 // suspend all threads and another thread may need the dex_lock_ to 2748 // get to a suspend point. 2749 StackHandleScope<1> hs(self); 2750 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2751 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2752 { 2753 WriterMutexLock mu(self, dex_lock_); 2754 if (IsDexFileRegisteredLocked(dex_file)) { 2755 return; 2756 } 2757 RegisterDexFileLocked(dex_file, dex_cache); 2758 } 2759} 2760 2761void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2762 Handle<mirror::DexCache> dex_cache) { 2763 WriterMutexLock mu(Thread::Current(), dex_lock_); 2764 RegisterDexFileLocked(dex_file, dex_cache); 2765} 2766 2767mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2768 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2769 // Search assuming unique-ness of dex file. 2770 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2771 mirror::DexCache* dex_cache = GetDexCache(i); 2772 if (dex_cache->GetDexFile() == &dex_file) { 2773 return dex_cache; 2774 } 2775 } 2776 // Search matching by location name. 2777 std::string location(dex_file.GetLocation()); 2778 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2779 mirror::DexCache* dex_cache = GetDexCache(i); 2780 if (dex_cache->GetDexFile()->GetLocation() == location) { 2781 return dex_cache; 2782 } 2783 } 2784 // Failure, dump diagnostic and abort. 2785 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2786 mirror::DexCache* dex_cache = GetDexCache(i); 2787 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2788 } 2789 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2790 return NULL; 2791} 2792 2793void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2794 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2795 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2796 mirror::DexCache* dex_cache = GetDexCache(i); 2797 dex_cache->Fixup(resolution_method); 2798 } 2799} 2800 2801mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2802 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 2803 if (UNLIKELY(klass == NULL)) { 2804 return NULL; 2805 } 2806 return InitializePrimitiveClass(klass, type); 2807} 2808 2809mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2810 Primitive::Type type) { 2811 CHECK(primitive_class != NULL); 2812 // Must hold lock on object when initializing. 2813 Thread* self = Thread::Current(); 2814 StackHandleScope<1> hs(self); 2815 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2816 ObjectLock<mirror::Class> lock(self, h_class); 2817 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2818 primitive_class->SetPrimitiveType(type); 2819 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2820 const char* descriptor = Primitive::Descriptor(type); 2821 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2822 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2823 return primitive_class; 2824} 2825 2826// Create an array class (i.e. the class object for the array, not the 2827// array itself). "descriptor" looks like "[C" or "[[[[B" or 2828// "[Ljava/lang/String;". 2829// 2830// If "descriptor" refers to an array of primitives, look up the 2831// primitive type's internally-generated class object. 2832// 2833// "class_loader" is the class loader of the class that's referring to 2834// us. It's used to ensure that we're looking for the element type in 2835// the right context. It does NOT become the class loader for the 2836// array class; that always comes from the base element class. 2837// 2838// Returns NULL with an exception raised on failure. 2839mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2840 Handle<mirror::ClassLoader> class_loader) { 2841 // Identify the underlying component type 2842 CHECK_EQ('[', descriptor[0]); 2843 StackHandleScope<2> hs(self); 2844 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2845 if (component_type.Get() == nullptr) { 2846 DCHECK(self->IsExceptionPending()); 2847 // We need to accept erroneous classes as component types. 2848 component_type.Assign(LookupClass(descriptor + 1, class_loader.Get())); 2849 if (component_type.Get() == nullptr) { 2850 DCHECK(self->IsExceptionPending()); 2851 return nullptr; 2852 } else { 2853 self->ClearException(); 2854 } 2855 } 2856 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2857 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2858 return nullptr; 2859 } 2860 // See if the component type is already loaded. Array classes are 2861 // always associated with the class loader of their underlying 2862 // element type -- an array of Strings goes with the loader for 2863 // java/lang/String -- so we need to look for it there. (The 2864 // caller should have checked for the existence of the class 2865 // before calling here, but they did so with *their* class loader, 2866 // not the component type's loader.) 2867 // 2868 // If we find it, the caller adds "loader" to the class' initiating 2869 // loader list, which should prevent us from going through this again. 2870 // 2871 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2872 // are the same, because our caller (FindClass) just did the 2873 // lookup. (Even if we get this wrong we still have correct behavior, 2874 // because we effectively do this lookup again when we add the new 2875 // class to the hash table --- necessary because of possible races with 2876 // other threads.) 2877 if (class_loader.Get() != component_type->GetClassLoader()) { 2878 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2879 if (new_class != NULL) { 2880 return new_class; 2881 } 2882 } 2883 2884 // Fill out the fields in the Class. 2885 // 2886 // It is possible to execute some methods against arrays, because 2887 // all arrays are subclasses of java_lang_Object_, so we need to set 2888 // up a vtable. We can just point at the one in java_lang_Object_. 2889 // 2890 // Array classes are simple enough that we don't need to do a full 2891 // link step. 2892 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2893 if (UNLIKELY(!init_done_)) { 2894 // Classes that were hand created, ie not by FindSystemClass 2895 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2896 new_class.Assign(GetClassRoot(kClassArrayClass)); 2897 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2898 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2899 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2900 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2901 } else if (strcmp(descriptor, 2902 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2903 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2904 } else if (strcmp(descriptor, 2905 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2906 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2907 } else if (strcmp(descriptor, "[C") == 0) { 2908 new_class.Assign(GetClassRoot(kCharArrayClass)); 2909 } else if (strcmp(descriptor, "[I") == 0) { 2910 new_class.Assign(GetClassRoot(kIntArrayClass)); 2911 } 2912 } 2913 if (new_class.Get() == nullptr) { 2914 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 2915 if (new_class.Get() == nullptr) { 2916 return nullptr; 2917 } 2918 new_class->SetComponentType(component_type.Get()); 2919 } 2920 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2921 DCHECK(new_class->GetComponentType() != NULL); 2922 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2923 new_class->SetSuperClass(java_lang_Object); 2924 new_class->SetVTable(java_lang_Object->GetVTable()); 2925 new_class->SetPrimitiveType(Primitive::kPrimNot); 2926 new_class->SetClassLoader(component_type->GetClassLoader()); 2927 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 2928 new_class->PopulateEmbeddedImtAndVTable(); 2929 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2930 // don't need to set new_class->SetObjectSize(..) 2931 // because Object::SizeOf delegates to Array::SizeOf 2932 2933 2934 // All arrays have java/lang/Cloneable and java/io/Serializable as 2935 // interfaces. We need to set that up here, so that stuff like 2936 // "instanceof" works right. 2937 // 2938 // Note: The GC could run during the call to FindSystemClass, 2939 // so we need to make sure the class object is GC-valid while we're in 2940 // there. Do this by clearing the interface list so the GC will just 2941 // think that the entries are null. 2942 2943 2944 // Use the single, global copies of "interfaces" and "iftable" 2945 // (remember not to free them for arrays). 2946 { 2947 mirror::IfTable* array_iftable = array_iftable_.Read(); 2948 CHECK(array_iftable != nullptr); 2949 new_class->SetIfTable(array_iftable); 2950 } 2951 2952 // Inherit access flags from the component type. 2953 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2954 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2955 access_flags &= kAccJavaFlagsMask; 2956 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2957 // and remove "interface". 2958 access_flags |= kAccAbstract | kAccFinal; 2959 access_flags &= ~kAccInterface; 2960 2961 new_class->SetAccessFlags(access_flags); 2962 2963 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2964 if (existing == nullptr) { 2965 return new_class.Get(); 2966 } 2967 // Another thread must have loaded the class after we 2968 // started but before we finished. Abandon what we've 2969 // done. 2970 // 2971 // (Yes, this happens.) 2972 2973 return existing; 2974} 2975 2976mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2977 switch (type) { 2978 case 'B': 2979 return GetClassRoot(kPrimitiveByte); 2980 case 'C': 2981 return GetClassRoot(kPrimitiveChar); 2982 case 'D': 2983 return GetClassRoot(kPrimitiveDouble); 2984 case 'F': 2985 return GetClassRoot(kPrimitiveFloat); 2986 case 'I': 2987 return GetClassRoot(kPrimitiveInt); 2988 case 'J': 2989 return GetClassRoot(kPrimitiveLong); 2990 case 'S': 2991 return GetClassRoot(kPrimitiveShort); 2992 case 'Z': 2993 return GetClassRoot(kPrimitiveBoolean); 2994 case 'V': 2995 return GetClassRoot(kPrimitiveVoid); 2996 default: 2997 break; 2998 } 2999 std::string printable_type(PrintableChar(type)); 3000 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 3001 return NULL; 3002} 3003 3004mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 3005 size_t hash) { 3006 if (VLOG_IS_ON(class_linker)) { 3007 mirror::DexCache* dex_cache = klass->GetDexCache(); 3008 std::string source; 3009 if (dex_cache != NULL) { 3010 source += " from "; 3011 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3012 } 3013 LOG(INFO) << "Loaded class " << descriptor << source; 3014 } 3015 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3016 mirror::Class* existing = 3017 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3018 if (existing != NULL) { 3019 return existing; 3020 } 3021 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == NULL && 3022 dex_cache_image_class_lookup_required_) { 3023 // Check a class loaded with the system class loader matches one in the image if the class 3024 // is in the image. 3025 existing = LookupClassFromImage(descriptor); 3026 if (existing != NULL) { 3027 CHECK(klass == existing); 3028 } 3029 } 3030 VerifyObject(klass); 3031 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3032 if (log_new_class_table_roots_) { 3033 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3034 } 3035 return NULL; 3036} 3037 3038mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3039 size_t hash) { 3040 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3041 mirror::Class* existing = 3042 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3043 3044 if (existing == nullptr) { 3045 CHECK(klass->IsProxyClass()); 3046 return nullptr; 3047 } 3048 3049 CHECK_NE(existing, klass) << descriptor; 3050 CHECK(!existing->IsResolved()) << descriptor; 3051 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3052 3053 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 3054 ++it) { 3055 mirror::Class* klass = it->second.Read(); 3056 if (klass == existing) { 3057 class_table_.erase(it); 3058 break; 3059 } 3060 } 3061 3062 CHECK(!klass->IsTemp()) << descriptor; 3063 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3064 dex_cache_image_class_lookup_required_) { 3065 // Check a class loaded with the system class loader matches one in the image if the class 3066 // is in the image. 3067 existing = LookupClassFromImage(descriptor); 3068 if (existing != nullptr) { 3069 CHECK(klass == existing) << descriptor; 3070 } 3071 } 3072 VerifyObject(klass); 3073 3074 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3075 if (log_new_class_table_roots_) { 3076 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3077 } 3078 3079 return existing; 3080} 3081 3082bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 3083 size_t hash = Hash(descriptor); 3084 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3085 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3086 it != end && it->first == hash; 3087 ++it) { 3088 mirror::Class* klass = it->second.Read(); 3089 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3090 class_table_.erase(it); 3091 return true; 3092 } 3093 } 3094 return false; 3095} 3096 3097mirror::Class* ClassLinker::LookupClass(const char* descriptor, 3098 const mirror::ClassLoader* class_loader) { 3099 size_t hash = Hash(descriptor); 3100 { 3101 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3102 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3103 if (result != NULL) { 3104 return result; 3105 } 3106 } 3107 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 3108 return NULL; 3109 } else { 3110 // Lookup failed but need to search dex_caches_. 3111 mirror::Class* result = LookupClassFromImage(descriptor); 3112 if (result != NULL) { 3113 InsertClass(descriptor, result, hash); 3114 } else { 3115 // Searching the image dex files/caches failed, we don't want to get into this situation 3116 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3117 // classes into the class table. 3118 constexpr uint32_t kMaxFailedDexCacheLookups = 1000; 3119 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3120 MoveImageClassesToClassTable(); 3121 } 3122 } 3123 return result; 3124 } 3125} 3126 3127mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3128 const mirror::ClassLoader* class_loader, 3129 size_t hash) { 3130 auto end = class_table_.end(); 3131 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3132 mirror::Class* klass = it->second.Read(); 3133 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3134 if (kIsDebugBuild) { 3135 // Check for duplicates in the table. 3136 for (++it; it != end && it->first == hash; ++it) { 3137 mirror::Class* klass2 = it->second.Read(); 3138 CHECK(!(klass2->GetClassLoader() == class_loader && 3139 klass2->DescriptorEquals(descriptor))) 3140 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3141 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3142 } 3143 } 3144 return klass; 3145 } 3146 } 3147 return NULL; 3148} 3149 3150static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3151 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3152 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3153 CHECK(image != NULL); 3154 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3155 return root->AsObjectArray<mirror::DexCache>(); 3156} 3157 3158void ClassLinker::MoveImageClassesToClassTable() { 3159 Thread* self = Thread::Current(); 3160 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3161 if (!dex_cache_image_class_lookup_required_) { 3162 return; // All dex cache classes are already in the class table. 3163 } 3164 const char* old_no_suspend_cause = 3165 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 3166 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3167 std::string temp; 3168 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3169 mirror::DexCache* dex_cache = dex_caches->Get(i); 3170 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3171 for (int32_t j = 0; j < types->GetLength(); j++) { 3172 mirror::Class* klass = types->Get(j); 3173 if (klass != NULL) { 3174 DCHECK(klass->GetClassLoader() == NULL); 3175 const char* descriptor = klass->GetDescriptor(&temp); 3176 size_t hash = Hash(descriptor); 3177 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 3178 if (existing != NULL) { 3179 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3180 << PrettyClassAndClassLoader(klass); 3181 } else { 3182 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3183 if (log_new_class_table_roots_) { 3184 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3185 } 3186 } 3187 } 3188 } 3189 } 3190 dex_cache_image_class_lookup_required_ = false; 3191 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3192} 3193 3194mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3195 Thread* self = Thread::Current(); 3196 const char* old_no_suspend_cause = 3197 self->StartAssertNoThreadSuspension("Image class lookup"); 3198 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3199 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3200 mirror::DexCache* dex_cache = dex_caches->Get(i); 3201 const DexFile* dex_file = dex_cache->GetDexFile(); 3202 // Try binary searching the string/type index. 3203 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3204 if (string_id != NULL) { 3205 const DexFile::TypeId* type_id = 3206 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3207 if (type_id != NULL) { 3208 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3209 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3210 if (klass != NULL) { 3211 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3212 return klass; 3213 } 3214 } 3215 } 3216 } 3217 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3218 return NULL; 3219} 3220 3221void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3222 result.clear(); 3223 if (dex_cache_image_class_lookup_required_) { 3224 MoveImageClassesToClassTable(); 3225 } 3226 size_t hash = Hash(descriptor); 3227 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3228 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3229 it != end && it->first == hash; ++it) { 3230 mirror::Class* klass = it->second.Read(); 3231 if (klass->DescriptorEquals(descriptor)) { 3232 result.push_back(klass); 3233 } 3234 } 3235} 3236 3237void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 3238 // TODO: assert that the monitor on the Class is held 3239 Thread* self = Thread::Current(); 3240 ObjectLock<mirror::Class> lock(self, klass); 3241 3242 // Don't attempt to re-verify if already sufficiently verified. 3243 if (klass->IsVerified() || 3244 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 3245 return; 3246 } 3247 3248 // The class might already be erroneous, for example at compile time if we attempted to verify 3249 // this class as a parent to another. 3250 if (klass->IsErroneous()) { 3251 ThrowEarlierClassFailure(klass.Get()); 3252 return; 3253 } 3254 3255 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3256 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3257 } else { 3258 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3259 << PrettyClass(klass.Get()); 3260 CHECK(!Runtime::Current()->IsCompiler()); 3261 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3262 } 3263 3264 // Skip verification if disabled. 3265 if (!Runtime::Current()->IsVerificationEnabled()) { 3266 klass->SetStatus(mirror::Class::kStatusVerified, self); 3267 return; 3268 } 3269 3270 // Verify super class. 3271 StackHandleScope<2> hs(self); 3272 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3273 if (super.Get() != NULL) { 3274 // Acquire lock to prevent races on verifying the super class. 3275 ObjectLock<mirror::Class> lock(self, super); 3276 3277 if (!super->IsVerified() && !super->IsErroneous()) { 3278 VerifyClass(super); 3279 } 3280 if (!super->IsCompileTimeVerified()) { 3281 std::string error_msg( 3282 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3283 PrettyDescriptor(klass.Get()).c_str(), 3284 PrettyDescriptor(super.Get()).c_str())); 3285 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3286 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3287 if (cause.Get() != nullptr) { 3288 self->ClearException(); 3289 } 3290 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3291 if (cause.Get() != nullptr) { 3292 self->GetException(nullptr)->SetCause(cause.Get()); 3293 } 3294 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3295 if (Runtime::Current()->IsCompiler()) { 3296 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3297 } 3298 klass->SetStatus(mirror::Class::kStatusError, self); 3299 return; 3300 } 3301 } 3302 3303 // Try to use verification information from the oat file, otherwise do runtime verification. 3304 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3305 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3306 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3307 if (oat_file_class_status == mirror::Class::kStatusError) { 3308 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3309 << PrettyDescriptor(klass.Get()) << " in " 3310 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3311 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3312 PrettyDescriptor(klass.Get()).c_str()); 3313 klass->SetStatus(mirror::Class::kStatusError, self); 3314 return; 3315 } 3316 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3317 std::string error_msg; 3318 if (!preverified) { 3319 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 3320 Runtime::Current()->IsCompiler(), 3321 &error_msg); 3322 } 3323 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3324 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3325 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3326 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3327 << " because: " << error_msg; 3328 } 3329 self->AssertNoPendingException(); 3330 // Make sure all classes referenced by catch blocks are resolved. 3331 ResolveClassExceptionHandlerTypes(dex_file, klass); 3332 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3333 // Even though there were no verifier failures we need to respect whether the super-class 3334 // was verified or requiring runtime reverification. 3335 if (super.Get() == NULL || super->IsVerified()) { 3336 klass->SetStatus(mirror::Class::kStatusVerified, self); 3337 } else { 3338 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3339 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3340 // Pretend a soft failure occured so that we don't consider the class verified below. 3341 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3342 } 3343 } else { 3344 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3345 // Soft failures at compile time should be retried at runtime. Soft 3346 // failures at runtime will be handled by slow paths in the generated 3347 // code. Set status accordingly. 3348 if (Runtime::Current()->IsCompiler()) { 3349 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3350 } else { 3351 klass->SetStatus(mirror::Class::kStatusVerified, self); 3352 } 3353 } 3354 } else { 3355 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3356 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3357 << " because: " << error_msg; 3358 self->AssertNoPendingException(); 3359 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3360 klass->SetStatus(mirror::Class::kStatusError, self); 3361 } 3362 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3363 // Class is verified so we don't need to do any access check on its methods. 3364 // Let the interpreter know it by setting the kAccPreverified flag onto each 3365 // method. 3366 // Note: we're going here during compilation and at runtime. When we set the 3367 // kAccPreverified flag when compiling image classes, the flag is recorded 3368 // in the image and is set when loading the image. 3369 klass->SetPreverifiedFlagOnAllMethods(); 3370 } 3371} 3372 3373bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3374 mirror::Class::Status& oat_file_class_status) { 3375 // If we're compiling, we can only verify the class using the oat file if 3376 // we are not compiling the image or if the class we're verifying is not part of 3377 // the app. In other words, we will only check for preverification of bootclasspath 3378 // classes. 3379 if (Runtime::Current()->IsCompiler()) { 3380 // Are we compiling the bootclasspath? 3381 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3382 return false; 3383 } 3384 // We are compiling an app (not the image). 3385 3386 // Is this an app class? (I.e. not a bootclasspath class) 3387 if (klass->GetClassLoader() != NULL) { 3388 return false; 3389 } 3390 } 3391 3392 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 3393 // Make this work with gtests, which do not set up the image properly. 3394 // TODO: we should clean up gtests to set up the image path properly. 3395 if (Runtime::Current()->IsCompiler() || (oat_file == NULL)) { 3396 return false; 3397 } 3398 3399 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3400 uint dex_location_checksum = dex_file.GetLocationChecksum(); 3401 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 3402 &dex_location_checksum); 3403 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3404 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3405 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3406 if (oat_file_class_status == mirror::Class::kStatusVerified || 3407 oat_file_class_status == mirror::Class::kStatusInitialized) { 3408 return true; 3409 } 3410 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3411 // Compile time verification failed with a soft error. Compile time verification can fail 3412 // because we have incomplete type information. Consider the following: 3413 // class ... { 3414 // Foo x; 3415 // .... () { 3416 // if (...) { 3417 // v1 gets assigned a type of resolved class Foo 3418 // } else { 3419 // v1 gets assigned a type of unresolved class Bar 3420 // } 3421 // iput x = v1 3422 // } } 3423 // when we merge v1 following the if-the-else it results in Conflict 3424 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3425 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3426 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3427 // at compile time). 3428 return false; 3429 } 3430 if (oat_file_class_status == mirror::Class::kStatusError) { 3431 // Compile time verification failed with a hard error. This is caused by invalid instructions 3432 // in the class. These errors are unrecoverable. 3433 return false; 3434 } 3435 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3436 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3437 // not loading the class. 3438 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3439 // isn't a problem and this case shouldn't occur 3440 return false; 3441 } 3442 std::string temp; 3443 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3444 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3445 << klass->GetDescriptor(&temp); 3446 3447 return false; 3448} 3449 3450void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3451 Handle<mirror::Class> klass) { 3452 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3453 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3454 } 3455 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3456 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3457 } 3458} 3459 3460void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3461 mirror::ArtMethod* method) { 3462 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3463 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3464 if (code_item == NULL) { 3465 return; // native or abstract method 3466 } 3467 if (code_item->tries_size_ == 0) { 3468 return; // nothing to process 3469 } 3470 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3471 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3472 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3473 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3474 CatchHandlerIterator iterator(handlers_ptr); 3475 for (; iterator.HasNext(); iterator.Next()) { 3476 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3477 // unresolved exception types will be ignored by exception delivery 3478 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3479 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3480 if (exception_type == NULL) { 3481 DCHECK(Thread::Current()->IsExceptionPending()); 3482 Thread::Current()->ClearException(); 3483 } 3484 } 3485 } 3486 handlers_ptr = iterator.EndDataPointer(); 3487 } 3488} 3489 3490static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3491static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3492 Handle<mirror::ArtMethod> prototype); 3493 3494mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3495 jobjectArray interfaces, jobject loader, 3496 jobjectArray methods, jobjectArray throws) { 3497 Thread* self = soa.Self(); 3498 StackHandleScope<8> hs(self); 3499 Handle<mirror::Class> klass(hs.NewHandle( 3500 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3501 if (klass.Get() == NULL) { 3502 CHECK(self->IsExceptionPending()); // OOME. 3503 return NULL; 3504 } 3505 DCHECK(klass->GetClass() != NULL); 3506 klass->SetObjectSize(sizeof(mirror::Proxy)); 3507 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 3508 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3509 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3510 klass->SetName(soa.Decode<mirror::String*>(name)); 3511 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3512 klass->SetDexCache(proxy_class->GetDexCache()); 3513 klass->SetStatus(mirror::Class::kStatusIdx, self); 3514 3515 // Instance fields are inherited, but we add a couple of static fields... 3516 { 3517 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3518 if (UNLIKELY(sfields == NULL)) { 3519 CHECK(self->IsExceptionPending()); // OOME. 3520 return NULL; 3521 } 3522 klass->SetSFields(sfields); 3523 } 3524 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3525 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3526 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3527 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3528 CHECK(self->IsExceptionPending()); // OOME. 3529 return nullptr; 3530 } 3531 klass->SetStaticField(0, interfaces_sfield.Get()); 3532 interfaces_sfield->SetDexFieldIndex(0); 3533 interfaces_sfield->SetDeclaringClass(klass.Get()); 3534 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3535 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3536 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3537 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3538 CHECK(self->IsExceptionPending()); // OOME. 3539 return nullptr; 3540 } 3541 klass->SetStaticField(1, throws_sfield.Get()); 3542 throws_sfield->SetDexFieldIndex(1); 3543 throws_sfield->SetDeclaringClass(klass.Get()); 3544 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3545 3546 // Proxies have 1 direct method, the constructor 3547 { 3548 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3549 if (UNLIKELY(directs == nullptr)) { 3550 CHECK(self->IsExceptionPending()); // OOME. 3551 return nullptr; 3552 } 3553 klass->SetDirectMethods(directs); 3554 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3555 if (UNLIKELY(constructor == nullptr)) { 3556 CHECK(self->IsExceptionPending()); // OOME. 3557 return nullptr; 3558 } 3559 klass->SetDirectMethod(0, constructor); 3560 } 3561 3562 // Create virtual method using specified prototypes. 3563 size_t num_virtual_methods = 3564 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3565 { 3566 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3567 num_virtual_methods); 3568 if (UNLIKELY(virtuals == NULL)) { 3569 CHECK(self->IsExceptionPending()); // OOME. 3570 return NULL; 3571 } 3572 klass->SetVirtualMethods(virtuals); 3573 } 3574 for (size_t i = 0; i < num_virtual_methods; ++i) { 3575 StackHandleScope<1> hs(self); 3576 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3577 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3578 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3579 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3580 if (UNLIKELY(clone == nullptr)) { 3581 CHECK(self->IsExceptionPending()); // OOME. 3582 return nullptr; 3583 } 3584 klass->SetVirtualMethod(i, clone); 3585 } 3586 3587 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3588 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3589 self->AssertNoPendingException(); 3590 3591 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3592 mirror::Class* new_class = nullptr; 3593 { 3594 ObjectLock<mirror::Class> resolution_lock(self, klass); // Must hold lock on object when resolved. 3595 // Link the fields and virtual methods, creating vtable and iftables 3596 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3597 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3598 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3599 klass->SetStatus(mirror::Class::kStatusError, self); 3600 return nullptr; 3601 } 3602 } 3603 3604 CHECK(klass->IsRetired()); 3605 CHECK_NE(klass.Get(), new_class); 3606 klass.Assign(new_class); 3607 3608 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3609 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3610 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3611 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3612 3613 { 3614 // Lock on klass is released. Lock new class object. 3615 ObjectLock<mirror::Class> initialization_lock(self, klass); 3616 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3617 } 3618 3619 // sanity checks 3620 if (kIsDebugBuild) { 3621 CHECK(klass->GetIFields() == nullptr); 3622 CheckProxyConstructor(klass->GetDirectMethod(0)); 3623 for (size_t i = 0; i < num_virtual_methods; ++i) { 3624 StackHandleScope<2> hs(self); 3625 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3626 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3627 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3628 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3629 CheckProxyMethod(virtual_method, prototype); 3630 } 3631 3632 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3633 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3634 decoded_name->ToModifiedUtf8().c_str())); 3635 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3636 3637 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3638 decoded_name->ToModifiedUtf8().c_str())); 3639 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3640 3641 CHECK_EQ(klass.Get()->GetInterfaces(), 3642 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3643 CHECK_EQ(klass.Get()->GetThrows(), 3644 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3645 } 3646 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3647 CHECK(existing == nullptr); 3648 return klass.Get(); 3649} 3650 3651std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3652 DCHECK(proxy_class->IsProxyClass()); 3653 mirror::String* name = proxy_class->GetName(); 3654 DCHECK(name != NULL); 3655 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3656} 3657 3658mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3659 mirror::ArtMethod* proxy_method) { 3660 DCHECK(proxy_class->IsProxyClass()); 3661 DCHECK(proxy_method->IsProxyMethod()); 3662 // Locate the dex cache of the original interface/Object 3663 mirror::DexCache* dex_cache = nullptr; 3664 { 3665 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3666 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3667 mirror::DexCache* a_dex_cache = GetDexCache(i); 3668 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3669 dex_cache = a_dex_cache; 3670 break; 3671 } 3672 } 3673 } 3674 CHECK(dex_cache != nullptr); 3675 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3676 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3677 CHECK(resolved_method != nullptr); 3678 return resolved_method; 3679} 3680 3681 3682mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3683 Handle<mirror::Class> klass, 3684 mirror::Class* proxy_class) { 3685 // Create constructor for Proxy that must initialize h 3686 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3687 proxy_class->GetDirectMethods(); 3688 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3689 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3690 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 3691 // constructor method. 3692 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 3693 proxy_constructor); 3694 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3695 // code_ too) 3696 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3697 if (constructor == nullptr) { 3698 CHECK(self->IsExceptionPending()); // OOME. 3699 return nullptr; 3700 } 3701 // Make this constructor public and fix the class to be our Proxy version 3702 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3703 constructor->SetDeclaringClass(klass.Get()); 3704 return constructor; 3705} 3706 3707static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3708 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3709 CHECK(constructor->IsConstructor()); 3710 CHECK_STREQ(constructor->GetName(), "<init>"); 3711 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3712 "(Ljava/lang/reflect/InvocationHandler;)V"); 3713 DCHECK(constructor->IsPublic()); 3714} 3715 3716mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3717 Handle<mirror::Class> klass, 3718 Handle<mirror::ArtMethod> prototype) { 3719 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3720 // prototype method 3721 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3722 prototype.Get()); 3723 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3724 // as necessary 3725 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3726 if (UNLIKELY(method == NULL)) { 3727 CHECK(self->IsExceptionPending()); // OOME. 3728 return NULL; 3729 } 3730 3731 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3732 // the intersection of throw exceptions as defined in Proxy 3733 method->SetDeclaringClass(klass.Get()); 3734 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3735 3736 // At runtime the method looks like a reference and argument saving method, clone the code 3737 // related parameters from this method. 3738 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3739 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3740 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3741 3742 return method; 3743} 3744 3745static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3746 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3747 // Basic sanity 3748 CHECK(!prototype->IsFinal()); 3749 CHECK(method->IsFinal()); 3750 CHECK(!method->IsAbstract()); 3751 3752 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3753 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3754 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3755 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 3756 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 3757 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3758 3759 MethodHelper mh(method); 3760 MethodHelper mh2(prototype); 3761 CHECK_STREQ(method->GetName(), prototype->GetName()); 3762 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3763 // More complex sanity - via dex cache 3764 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3765} 3766 3767static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3768 bool can_init_parents) 3769 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3770 if (can_init_statics && can_init_parents) { 3771 return true; 3772 } 3773 if (!can_init_statics) { 3774 // Check if there's a class initializer. 3775 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3776 if (clinit != NULL) { 3777 return false; 3778 } 3779 // Check if there are encoded static values needing initialization. 3780 if (klass->NumStaticFields() != 0) { 3781 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3782 DCHECK(dex_class_def != NULL); 3783 if (dex_class_def->static_values_off_ != 0) { 3784 return false; 3785 } 3786 } 3787 } 3788 if (!klass->IsInterface() && klass->HasSuperClass()) { 3789 mirror::Class* super_class = klass->GetSuperClass(); 3790 if (!can_init_parents && !super_class->IsInitialized()) { 3791 return false; 3792 } else { 3793 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3794 return false; 3795 } 3796 } 3797 } 3798 return true; 3799} 3800 3801bool ClassLinker::IsInitialized() const { 3802 return init_done_; 3803} 3804 3805bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3806 bool can_init_parents) { 3807 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3808 3809 // Are we already initialized and therefore done? 3810 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3811 // an initialized class will never change its state. 3812 if (klass->IsInitialized()) { 3813 return true; 3814 } 3815 3816 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3817 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3818 return false; 3819 } 3820 3821 Thread* self = Thread::Current(); 3822 uint64_t t0; 3823 { 3824 ObjectLock<mirror::Class> lock(self, klass); 3825 3826 // Re-check under the lock in case another thread initialized ahead of us. 3827 if (klass->IsInitialized()) { 3828 return true; 3829 } 3830 3831 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3832 if (klass->IsErroneous()) { 3833 ThrowEarlierClassFailure(klass.Get()); 3834 return false; 3835 } 3836 3837 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3838 3839 if (!klass->IsVerified()) { 3840 VerifyClass(klass); 3841 if (!klass->IsVerified()) { 3842 // We failed to verify, expect either the klass to be erroneous or verification failed at 3843 // compile time. 3844 if (klass->IsErroneous()) { 3845 CHECK(self->IsExceptionPending()); 3846 } else { 3847 CHECK(Runtime::Current()->IsCompiler()); 3848 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3849 } 3850 return false; 3851 } else { 3852 self->AssertNoPendingException(); 3853 } 3854 } 3855 3856 // If the class is kStatusInitializing, either this thread is 3857 // initializing higher up the stack or another thread has beat us 3858 // to initializing and we need to wait. Either way, this 3859 // invocation of InitializeClass will not be responsible for 3860 // running <clinit> and will return. 3861 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3862 // Could have got an exception during verification. 3863 if (self->IsExceptionPending()) { 3864 return false; 3865 } 3866 // We caught somebody else in the act; was it us? 3867 if (klass->GetClinitThreadId() == self->GetTid()) { 3868 // Yes. That's fine. Return so we can continue initializing. 3869 return true; 3870 } 3871 // No. That's fine. Wait for another thread to finish initializing. 3872 return WaitForInitializeClass(klass, self, lock); 3873 } 3874 3875 if (!ValidateSuperClassDescriptors(klass)) { 3876 klass->SetStatus(mirror::Class::kStatusError, self); 3877 return false; 3878 } 3879 3880 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3881 3882 // From here out other threads may observe that we're initializing and so changes of state 3883 // require the a notification. 3884 klass->SetClinitThreadId(self->GetTid()); 3885 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3886 3887 t0 = NanoTime(); 3888 } 3889 3890 // Initialize super classes, must be done while initializing for the JLS. 3891 if (!klass->IsInterface() && klass->HasSuperClass()) { 3892 mirror::Class* super_class = klass->GetSuperClass(); 3893 if (!super_class->IsInitialized()) { 3894 CHECK(!super_class->IsInterface()); 3895 CHECK(can_init_parents); 3896 StackHandleScope<1> hs(self); 3897 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3898 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3899 if (!super_initialized) { 3900 // The super class was verified ahead of entering initializing, we should only be here if 3901 // the super class became erroneous due to initialization. 3902 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3903 << "Super class initialization failed for " 3904 << PrettyDescriptor(handle_scope_super.Get()) 3905 << " that has unexpected status " << handle_scope_super->GetStatus() 3906 << "\nPending exception:\n" 3907 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3908 ObjectLock<mirror::Class> lock(self, klass); 3909 // Initialization failed because the super-class is erroneous. 3910 klass->SetStatus(mirror::Class::kStatusError, self); 3911 return false; 3912 } 3913 } 3914 } 3915 3916 if (klass->NumStaticFields() > 0) { 3917 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3918 CHECK(dex_class_def != NULL); 3919 const DexFile& dex_file = klass->GetDexFile(); 3920 StackHandleScope<2> hs(self); 3921 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3922 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3923 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3924 this, *dex_class_def); 3925 if (it.HasNext()) { 3926 CHECK(can_init_statics); 3927 // We reordered the fields, so we need to be able to map the 3928 // field indexes to the right fields. 3929 SafeMap<uint32_t, mirror::ArtField*> field_map; 3930 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3931 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3932 if (Runtime::Current()->IsActiveTransaction()) { 3933 it.ReadValueToField<true>(field_map.Get(i)); 3934 } else { 3935 it.ReadValueToField<false>(field_map.Get(i)); 3936 } 3937 } 3938 } 3939 } 3940 3941 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3942 if (clinit != NULL) { 3943 CHECK(can_init_statics); 3944 JValue result; 3945 clinit->Invoke(self, NULL, 0, &result, "V"); 3946 } 3947 3948 uint64_t t1 = NanoTime(); 3949 3950 bool success = true; 3951 { 3952 ObjectLock<mirror::Class> lock(self, klass); 3953 3954 if (self->IsExceptionPending()) { 3955 WrapExceptionInInitializer(); 3956 klass->SetStatus(mirror::Class::kStatusError, self); 3957 success = false; 3958 } else { 3959 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3960 RuntimeStats* thread_stats = self->GetStats(); 3961 ++global_stats->class_init_count; 3962 ++thread_stats->class_init_count; 3963 global_stats->class_init_time_ns += (t1 - t0); 3964 thread_stats->class_init_time_ns += (t1 - t0); 3965 // Set the class as initialized except if failed to initialize static fields. 3966 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3967 if (VLOG_IS_ON(class_linker)) { 3968 std::string temp; 3969 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 3970 klass->GetLocation(); 3971 } 3972 // Opportunistically set static method trampolines to their destination. 3973 FixupStaticTrampolines(klass.Get()); 3974 } 3975 } 3976 return success; 3977} 3978 3979bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3980 ObjectLock<mirror::Class>& lock) 3981 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3982 while (true) { 3983 self->AssertNoPendingException(); 3984 CHECK(!klass->IsInitialized()); 3985 lock.WaitIgnoringInterrupts(); 3986 3987 // When we wake up, repeat the test for init-in-progress. If 3988 // there's an exception pending (only possible if 3989 // "interruptShouldThrow" was set), bail out. 3990 if (self->IsExceptionPending()) { 3991 WrapExceptionInInitializer(); 3992 klass->SetStatus(mirror::Class::kStatusError, self); 3993 return false; 3994 } 3995 // Spurious wakeup? Go back to waiting. 3996 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3997 continue; 3998 } 3999 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 4000 // Compile time initialization failed. 4001 return false; 4002 } 4003 if (klass->IsErroneous()) { 4004 // The caller wants an exception, but it was thrown in a 4005 // different thread. Synthesize one here. 4006 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 4007 PrettyDescriptor(klass.Get()).c_str()); 4008 return false; 4009 } 4010 if (klass->IsInitialized()) { 4011 return true; 4012 } 4013 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4014 << klass->GetStatus(); 4015 } 4016 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 4017} 4018 4019bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 4020 if (klass->IsInterface()) { 4021 return true; 4022 } 4023 // Begin with the methods local to the superclass. 4024 StackHandleScope<2> hs(Thread::Current()); 4025 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4026 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4027 if (klass->HasSuperClass() && 4028 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4029 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4030 mh.ChangeMethod(klass->GetVTableEntry(i)); 4031 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 4032 if (mh.GetMethod() != super_mh.GetMethod() && 4033 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4034 ThrowLinkageError(klass.Get(), 4035 "Class %s method %s resolves differently in superclass %s", 4036 PrettyDescriptor(klass.Get()).c_str(), 4037 PrettyMethod(mh.GetMethod()).c_str(), 4038 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4039 return false; 4040 } 4041 } 4042 } 4043 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4044 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4045 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4046 for (uint32_t j = 0; j < num_methods; ++j) { 4047 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4048 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4049 if (mh.GetMethod() != super_mh.GetMethod() && 4050 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4051 ThrowLinkageError(klass.Get(), 4052 "Class %s method %s resolves differently in interface %s", 4053 PrettyDescriptor(klass.Get()).c_str(), 4054 PrettyMethod(mh.GetMethod()).c_str(), 4055 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4056 return false; 4057 } 4058 } 4059 } 4060 } 4061 return true; 4062} 4063 4064bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 4065 bool can_init_parents) { 4066 DCHECK(c.Get() != nullptr); 4067 if (c->IsInitialized()) { 4068 return true; 4069 } 4070 const bool success = InitializeClass(c, can_init_fields, can_init_parents); 4071 Thread* self = Thread::Current(); 4072 if (!success) { 4073 if (can_init_fields && can_init_parents) { 4074 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4075 } 4076 } else { 4077 self->AssertNoPendingException(); 4078 } 4079 return success; 4080} 4081 4082void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 4083 mirror::Class* c, 4084 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 4085 const byte* class_data = dex_file.GetClassData(dex_class_def); 4086 ClassDataItemIterator it(dex_file, class_data); 4087 StackHandleScope<2> hs(Thread::Current()); 4088 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 4089 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 4090 CHECK(!kMovingFields); 4091 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 4092 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 4093 } 4094} 4095 4096void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4097 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4098 if (fields != nullptr) { 4099 for (int index = 0; index < fields->GetLength(); index ++) { 4100 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4101 fields->Get(index)->SetDeclaringClass(new_class); 4102 } 4103 } 4104 } 4105 4106 fields = new_class->GetSFields(); 4107 if (fields != nullptr) { 4108 for (int index = 0; index < fields->GetLength(); index ++) { 4109 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4110 fields->Get(index)->SetDeclaringClass(new_class); 4111 } 4112 } 4113 } 4114 4115 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4116 if (methods != nullptr) { 4117 for (int index = 0; index < methods->GetLength(); index ++) { 4118 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4119 methods->Get(index)->SetDeclaringClass(new_class); 4120 } 4121 } 4122 } 4123 4124 methods = new_class->GetVirtualMethods(); 4125 if (methods != nullptr) { 4126 for (int index = 0; index < methods->GetLength(); index ++) { 4127 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4128 methods->Get(index)->SetDeclaringClass(new_class); 4129 } 4130 } 4131 } 4132} 4133 4134bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4135 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4136 mirror::Class** new_class) { 4137 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4138 4139 if (!LinkSuperClass(klass)) { 4140 return false; 4141 } 4142 if (!LinkMethods(self, klass, interfaces)) { 4143 return false; 4144 } 4145 if (!LinkInstanceFields(klass)) { 4146 return false; 4147 } 4148 size_t class_size; 4149 if (!LinkStaticFields(klass, &class_size)) { 4150 return false; 4151 } 4152 CreateReferenceInstanceOffsets(klass); 4153 CreateReferenceStaticOffsets(klass); 4154 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4155 4156 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4157 // We don't need to retire this class as it has no embedded tables or it was created the 4158 // correct size during class linker initialization. 4159 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4160 4161 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4162 klass->PopulateEmbeddedImtAndVTable(); 4163 } 4164 4165 // This will notify waiters on klass that saw the not yet resolved 4166 // class in the class_table_ during EnsureResolved. 4167 klass->SetStatus(mirror::Class::kStatusResolved, self); 4168 *new_class = klass.Get(); 4169 } else { 4170 CHECK(!klass->IsResolved()); 4171 // Retire the temporary class and create the correctly sized resolved class. 4172 *new_class = klass->CopyOf(self, class_size); 4173 if (UNLIKELY(*new_class == NULL)) { 4174 CHECK(self->IsExceptionPending()); // Expect an OOME. 4175 klass->SetStatus(mirror::Class::kStatusError, self); 4176 return false; 4177 } 4178 4179 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4180 StackHandleScope<1> hs(self); 4181 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4182 ObjectLock<mirror::Class> lock(self, new_class_h); 4183 4184 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4185 4186 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4187 CHECK(existing == NULL || existing == klass.Get()); 4188 4189 // This will notify waiters on temp class that saw the not yet resolved class in the 4190 // class_table_ during EnsureResolved. 4191 klass->SetStatus(mirror::Class::kStatusRetired, self); 4192 4193 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4194 // This will notify waiters on new_class that saw the not yet resolved 4195 // class in the class_table_ during EnsureResolved. 4196 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4197 } 4198 return true; 4199} 4200 4201bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4202 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4203 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4204 uint16_t super_class_idx = class_def.superclass_idx_; 4205 if (super_class_idx != DexFile::kDexNoIndex16) { 4206 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4207 if (super_class == NULL) { 4208 DCHECK(Thread::Current()->IsExceptionPending()); 4209 return false; 4210 } 4211 // Verify 4212 if (!klass->CanAccess(super_class)) { 4213 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4214 PrettyDescriptor(super_class).c_str(), 4215 PrettyDescriptor(klass.Get()).c_str()); 4216 return false; 4217 } 4218 CHECK(super_class->IsResolved()); 4219 klass->SetSuperClass(super_class); 4220 } 4221 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4222 if (interfaces != NULL) { 4223 for (size_t i = 0; i < interfaces->Size(); i++) { 4224 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4225 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4226 if (interface == NULL) { 4227 DCHECK(Thread::Current()->IsExceptionPending()); 4228 return false; 4229 } 4230 // Verify 4231 if (!klass->CanAccess(interface)) { 4232 // TODO: the RI seemed to ignore this in my testing. 4233 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4234 PrettyDescriptor(interface).c_str(), 4235 PrettyDescriptor(klass.Get()).c_str()); 4236 return false; 4237 } 4238 } 4239 } 4240 // Mark the class as loaded. 4241 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 4242 return true; 4243} 4244 4245bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4246 CHECK(!klass->IsPrimitive()); 4247 mirror::Class* super = klass->GetSuperClass(); 4248 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4249 if (super != NULL) { 4250 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4251 return false; 4252 } 4253 return true; 4254 } 4255 if (super == NULL) { 4256 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4257 PrettyDescriptor(klass.Get()).c_str()); 4258 return false; 4259 } 4260 // Verify 4261 if (super->IsFinal() || super->IsInterface()) { 4262 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4263 PrettyDescriptor(super).c_str(), 4264 PrettyDescriptor(klass.Get()).c_str(), 4265 super->IsFinal() ? "declared final" : "an interface"); 4266 return false; 4267 } 4268 if (!klass->CanAccess(super)) { 4269 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4270 PrettyDescriptor(super).c_str(), 4271 PrettyDescriptor(klass.Get()).c_str()); 4272 return false; 4273 } 4274 4275 // Inherit kAccClassIsFinalizable from the superclass in case this 4276 // class doesn't override finalize. 4277 if (super->IsFinalizable()) { 4278 klass->SetFinalizable(); 4279 } 4280 4281 // Inherit reference flags (if any) from the superclass. 4282 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4283 if (reference_flags != 0) { 4284 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4285 } 4286 // Disallow custom direct subclasses of java.lang.ref.Reference. 4287 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4288 ThrowLinkageError(klass.Get(), 4289 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4290 PrettyDescriptor(klass.Get()).c_str()); 4291 return false; 4292 } 4293 4294 if (kIsDebugBuild) { 4295 // Ensure super classes are fully resolved prior to resolving fields.. 4296 while (super != NULL) { 4297 CHECK(super->IsResolved()); 4298 super = super->GetSuperClass(); 4299 } 4300 } 4301 return true; 4302} 4303 4304// Populate the class vtable and itable. Compute return type indices. 4305bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4306 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4307 if (klass->IsInterface()) { 4308 // No vtable. 4309 size_t count = klass->NumVirtualMethods(); 4310 if (!IsUint(16, count)) { 4311 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4312 return false; 4313 } 4314 for (size_t i = 0; i < count; ++i) { 4315 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4316 } 4317 // Link interface method tables 4318 return LinkInterfaceMethods(klass, interfaces); 4319 } else { 4320 // Link virtual and interface method tables 4321 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4322 } 4323 return true; 4324} 4325 4326bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4327 if (klass->HasSuperClass()) { 4328 uint32_t max_count = klass->NumVirtualMethods() + 4329 klass->GetSuperClass()->GetVTableLength(); 4330 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4331 CHECK_LE(actual_count, max_count); 4332 StackHandleScope<4> hs(self); 4333 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4334 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4335 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4336 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4337 if (UNLIKELY(vtable.Get() == nullptr)) { 4338 CHECK(self->IsExceptionPending()); // OOME. 4339 return false; 4340 } 4341 int len = super_class->GetVTableLength(); 4342 for (int i = 0; i < len; i++) { 4343 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4344 } 4345 } else { 4346 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4347 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4348 if (UNLIKELY(vtable.Get() == nullptr)) { 4349 CHECK(self->IsExceptionPending()); // OOME. 4350 return false; 4351 } 4352 } 4353 4354 // See if any of our virtual methods override the superclass. 4355 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4356 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4357 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4358 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4359 local_mh.ChangeMethod(local_method); 4360 size_t j = 0; 4361 for (; j < actual_count; ++j) { 4362 mirror::ArtMethod* super_method = vtable->Get(j); 4363 super_mh.ChangeMethod(super_method); 4364 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4365 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4366 super_method->GetAccessFlags())) { 4367 if (super_method->IsFinal()) { 4368 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4369 PrettyMethod(local_method).c_str(), 4370 super_method->GetDeclaringClassDescriptor()); 4371 return false; 4372 } 4373 vtable->Set<false>(j, local_method); 4374 local_method->SetMethodIndex(j); 4375 break; 4376 } else { 4377 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4378 << " would have incorrectly overridden the package-private method in " 4379 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4380 } 4381 } 4382 } 4383 if (j == actual_count) { 4384 // Not overriding, append. 4385 vtable->Set<false>(actual_count, local_method); 4386 local_method->SetMethodIndex(actual_count); 4387 actual_count += 1; 4388 } 4389 } 4390 if (!IsUint(16, actual_count)) { 4391 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4392 return false; 4393 } 4394 // Shrink vtable if possible 4395 CHECK_LE(actual_count, max_count); 4396 if (actual_count < max_count) { 4397 vtable.Assign(vtable->CopyOf(self, actual_count)); 4398 if (UNLIKELY(vtable.Get() == NULL)) { 4399 CHECK(self->IsExceptionPending()); // OOME. 4400 return false; 4401 } 4402 } 4403 klass->SetVTable(vtable.Get()); 4404 } else { 4405 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4406 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4407 if (!IsUint(16, num_virtual_methods)) { 4408 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4409 return false; 4410 } 4411 StackHandleScope<1> hs(self); 4412 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4413 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4414 if (UNLIKELY(vtable.Get() == NULL)) { 4415 CHECK(self->IsExceptionPending()); // OOME. 4416 return false; 4417 } 4418 for (size_t i = 0; i < num_virtual_methods; ++i) { 4419 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4420 vtable->Set<false>(i, virtual_method); 4421 virtual_method->SetMethodIndex(i & 0xFFFF); 4422 } 4423 klass->SetVTable(vtable.Get()); 4424 } 4425 return true; 4426} 4427 4428bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 4429 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4430 Thread* const self = Thread::Current(); 4431 Runtime* const runtime = Runtime::Current(); 4432 // Set the imt table to be all conflicts by default. 4433 klass->SetImTable(runtime->GetDefaultImt()); 4434 size_t super_ifcount; 4435 if (klass->HasSuperClass()) { 4436 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4437 } else { 4438 super_ifcount = 0; 4439 } 4440 uint32_t num_interfaces = 4441 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4442 size_t ifcount = super_ifcount + num_interfaces; 4443 for (size_t i = 0; i < num_interfaces; i++) { 4444 mirror::Class* interface = 4445 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4446 interfaces->Get(i); 4447 ifcount += interface->GetIfTableCount(); 4448 } 4449 if (ifcount == 0) { 4450 // Class implements no interfaces. 4451 DCHECK_EQ(klass->GetIfTableCount(), 0); 4452 DCHECK(klass->GetIfTable() == NULL); 4453 return true; 4454 } 4455 if (ifcount == super_ifcount) { 4456 // Class implements same interfaces as parent, are any of these not marker interfaces? 4457 bool has_non_marker_interface = false; 4458 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4459 for (size_t i = 0; i < ifcount; ++i) { 4460 if (super_iftable->GetMethodArrayCount(i) > 0) { 4461 has_non_marker_interface = true; 4462 break; 4463 } 4464 } 4465 if (!has_non_marker_interface) { 4466 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4467 klass->SetIfTable(super_iftable); 4468 return true; 4469 } 4470 } 4471 StackHandleScope<4> hs(self); 4472 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4473 if (UNLIKELY(iftable.Get() == NULL)) { 4474 CHECK(self->IsExceptionPending()); // OOME. 4475 return false; 4476 } 4477 if (super_ifcount != 0) { 4478 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4479 for (size_t i = 0; i < super_ifcount; i++) { 4480 mirror::Class* super_interface = super_iftable->GetInterface(i); 4481 iftable->SetInterface(i, super_interface); 4482 } 4483 } 4484 // Flatten the interface inheritance hierarchy. 4485 size_t idx = super_ifcount; 4486 for (size_t i = 0; i < num_interfaces; i++) { 4487 mirror::Class* interface = 4488 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4489 interfaces->Get(i); 4490 DCHECK(interface != NULL); 4491 if (!interface->IsInterface()) { 4492 std::string temp; 4493 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4494 PrettyDescriptor(klass.Get()).c_str(), 4495 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4496 return false; 4497 } 4498 // Check if interface is already in iftable 4499 bool duplicate = false; 4500 for (size_t j = 0; j < idx; j++) { 4501 mirror::Class* existing_interface = iftable->GetInterface(j); 4502 if (existing_interface == interface) { 4503 duplicate = true; 4504 break; 4505 } 4506 } 4507 if (!duplicate) { 4508 // Add this non-duplicate interface. 4509 iftable->SetInterface(idx++, interface); 4510 // Add this interface's non-duplicate super-interfaces. 4511 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4512 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4513 bool super_duplicate = false; 4514 for (size_t k = 0; k < idx; k++) { 4515 mirror::Class* existing_interface = iftable->GetInterface(k); 4516 if (existing_interface == super_interface) { 4517 super_duplicate = true; 4518 break; 4519 } 4520 } 4521 if (!super_duplicate) { 4522 iftable->SetInterface(idx++, super_interface); 4523 } 4524 } 4525 } 4526 } 4527 // Shrink iftable in case duplicates were found 4528 if (idx < ifcount) { 4529 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4530 if (UNLIKELY(iftable.Get() == NULL)) { 4531 CHECK(self->IsExceptionPending()); // OOME. 4532 return false; 4533 } 4534 ifcount = idx; 4535 } else { 4536 CHECK_EQ(idx, ifcount); 4537 } 4538 klass->SetIfTable(iftable.Get()); 4539 4540 // If we're an interface, we don't need the vtable pointers, so we're done. 4541 if (klass->IsInterface()) { 4542 return true; 4543 } 4544 // Allocate imtable 4545 bool imtable_changed = false; 4546 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4547 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4548 if (UNLIKELY(imtable.Get() == NULL)) { 4549 CHECK(self->IsExceptionPending()); // OOME. 4550 return false; 4551 } 4552 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4553 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4554 std::vector<mirror::ArtMethod*> miranda_list; 4555 for (size_t i = 0; i < ifcount; ++i) { 4556 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4557 if (num_methods > 0) { 4558 StackHandleScope<2> hs(self); 4559 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4560 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4561 if (UNLIKELY(method_array.Get() == nullptr)) { 4562 CHECK(self->IsExceptionPending()); // OOME. 4563 return false; 4564 } 4565 iftable->SetMethodArray(i, method_array.Get()); 4566 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4567 hs.NewHandle(klass->GetVTableDuringLinking())); 4568 for (size_t j = 0; j < num_methods; ++j) { 4569 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 4570 interface_mh.ChangeMethod(interface_method); 4571 int32_t k; 4572 // For each method listed in the interface's method list, find the 4573 // matching method in our class's method list. We want to favor the 4574 // subclass over the superclass, which just requires walking 4575 // back from the end of the vtable. (This only matters if the 4576 // superclass defines a private method and this class redefines 4577 // it -- otherwise it would use the same vtable slot. In .dex files 4578 // those don't end up in the virtual method table, so it shouldn't 4579 // matter which direction we go. We walk it backward anyway.) 4580 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4581 mirror::ArtMethod* vtable_method = vtable->Get(k); 4582 vtable_mh.ChangeMethod(vtable_method); 4583 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4584 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 4585 ThrowIllegalAccessError( 4586 klass.Get(), 4587 "Method '%s' implementing interface method '%s' is not public", 4588 PrettyMethod(vtable_method).c_str(), 4589 PrettyMethod(interface_method).c_str()); 4590 return false; 4591 } 4592 method_array->Set<false>(j, vtable_method); 4593 // Place method in imt if entry is empty, place conflict otherwise. 4594 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4595 if (imtable->Get(imt_index) == NULL) { 4596 imtable->Set<false>(imt_index, vtable_method); 4597 imtable_changed = true; 4598 } else { 4599 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4600 } 4601 break; 4602 } 4603 } 4604 if (k < 0) { 4605 StackHandleScope<1> hs(self); 4606 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4607 for (mirror::ArtMethod* mir_method : miranda_list) { 4608 vtable_mh.ChangeMethod(mir_method); 4609 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4610 miranda_method.Assign(mir_method); 4611 break; 4612 } 4613 } 4614 if (miranda_method.Get() == NULL) { 4615 // Point the interface table at a phantom slot. 4616 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 4617 if (UNLIKELY(miranda_method.Get() == NULL)) { 4618 CHECK(self->IsExceptionPending()); // OOME. 4619 return false; 4620 } 4621 // TODO: If a methods move then the miranda_list may hold stale references. 4622 miranda_list.push_back(miranda_method.Get()); 4623 } 4624 method_array->Set<false>(j, miranda_method.Get()); 4625 } 4626 } 4627 } 4628 } 4629 if (imtable_changed) { 4630 // Fill in empty entries in interface method table with conflict. 4631 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4632 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4633 if (imtable->Get(i) == NULL) { 4634 imtable->Set<false>(i, imt_conflict_method); 4635 } 4636 } 4637 klass->SetImTable(imtable.Get()); 4638 } 4639 if (!miranda_list.empty()) { 4640 int old_method_count = klass->NumVirtualMethods(); 4641 int new_method_count = old_method_count + miranda_list.size(); 4642 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4643 if (old_method_count == 0) { 4644 virtuals = AllocArtMethodArray(self, new_method_count); 4645 } else { 4646 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4647 } 4648 if (UNLIKELY(virtuals == NULL)) { 4649 CHECK(self->IsExceptionPending()); // OOME. 4650 return false; 4651 } 4652 klass->SetVirtualMethods(virtuals); 4653 4654 StackHandleScope<1> hs(self); 4655 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4656 hs.NewHandle(klass->GetVTableDuringLinking())); 4657 CHECK(vtable.Get() != NULL); 4658 int old_vtable_count = vtable->GetLength(); 4659 int new_vtable_count = old_vtable_count + miranda_list.size(); 4660 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4661 if (UNLIKELY(vtable.Get() == NULL)) { 4662 CHECK(self->IsExceptionPending()); // OOME. 4663 return false; 4664 } 4665 for (size_t i = 0; i < miranda_list.size(); ++i) { 4666 mirror::ArtMethod* method = miranda_list[i]; 4667 // Leave the declaring class alone as type indices are relative to it 4668 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4669 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4670 klass->SetVirtualMethod(old_method_count + i, method); 4671 vtable->Set<false>(old_vtable_count + i, method); 4672 } 4673 // TODO: do not assign to the vtable field until it is fully constructed. 4674 klass->SetVTable(vtable.Get()); 4675 } 4676 4677 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4678 for (int i = 0; i < vtable->GetLength(); ++i) { 4679 CHECK(vtable->Get(i) != NULL); 4680 } 4681 4682// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4683 4684 return true; 4685} 4686 4687bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4688 CHECK(klass.Get() != NULL); 4689 return LinkFields(klass, false, nullptr); 4690} 4691 4692bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass, size_t* class_size) { 4693 CHECK(klass.Get() != NULL); 4694 return LinkFields(klass, true, class_size); 4695} 4696 4697struct LinkFieldsComparator { 4698 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4699 } 4700 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4701 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4702 NO_THREAD_SAFETY_ANALYSIS { 4703 // First come reference fields, then 64-bit, and finally 32-bit 4704 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4705 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4706 if (type1 != type2) { 4707 bool is_primitive1 = type1 != Primitive::kPrimNot; 4708 bool is_primitive2 = type2 != Primitive::kPrimNot; 4709 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4710 type1 == Primitive::kPrimDouble); 4711 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4712 type2 == Primitive::kPrimDouble); 4713 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4714 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4715 if (order1 != order2) { 4716 return order1 < order2; 4717 } 4718 } 4719 // same basic group? then sort by string. 4720 return strcmp(field1->GetName(), field2->GetName()) < 0; 4721 } 4722}; 4723 4724bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static, size_t* class_size) { 4725 size_t num_fields = 4726 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4727 4728 mirror::ObjectArray<mirror::ArtField>* fields = 4729 is_static ? klass->GetSFields() : klass->GetIFields(); 4730 4731 // Initialize field_offset 4732 MemberOffset field_offset(0); 4733 if (is_static) { 4734 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 4735 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4736 // Static fields come after the embedded tables. 4737 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 4738 0, 0, 0); 4739 } 4740 field_offset = MemberOffset(base); 4741 } else { 4742 mirror::Class* super_class = klass->GetSuperClass(); 4743 if (super_class != NULL) { 4744 CHECK(super_class->IsResolved()) 4745 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4746 field_offset = MemberOffset(super_class->GetObjectSize()); 4747 } 4748 } 4749 4750 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4751 4752 // we want a relatively stable order so that adding new fields 4753 // minimizes disruption of C++ version such as Class and Method. 4754 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4755 for (size_t i = 0; i < num_fields; i++) { 4756 mirror::ArtField* f = fields->Get(i); 4757 CHECK(f != NULL) << PrettyClass(klass.Get()); 4758 grouped_and_sorted_fields.push_back(f); 4759 } 4760 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4761 LinkFieldsComparator()); 4762 4763 // References should be at the front. 4764 size_t current_field = 0; 4765 size_t num_reference_fields = 0; 4766 for (; current_field < num_fields; current_field++) { 4767 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4768 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4769 bool isPrimitive = type != Primitive::kPrimNot; 4770 if (isPrimitive) { 4771 break; // past last reference, move on to the next phase 4772 } 4773 grouped_and_sorted_fields.pop_front(); 4774 num_reference_fields++; 4775 fields->Set<false>(current_field, field); 4776 field->SetOffset(field_offset); 4777 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4778 } 4779 4780 // Now we want to pack all of the double-wide fields together. If 4781 // we're not aligned, though, we want to shuffle one 32-bit field 4782 // into place. If we can't find one, we'll have to pad it. 4783 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4784 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4785 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4786 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4787 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4788 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4789 continue; 4790 } 4791 fields->Set<false>(current_field++, field); 4792 field->SetOffset(field_offset); 4793 // drop the consumed field 4794 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4795 break; 4796 } 4797 // whether we found a 32-bit field for padding or not, we advance 4798 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4799 } 4800 4801 // Alignment is good, shuffle any double-wide fields forward, and 4802 // finish assigning field offsets to all fields. 4803 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 4804 << PrettyClass(klass.Get()); 4805 while (!grouped_and_sorted_fields.empty()) { 4806 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4807 grouped_and_sorted_fields.pop_front(); 4808 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4809 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4810 fields->Set<false>(current_field, field); 4811 field->SetOffset(field_offset); 4812 field_offset = MemberOffset(field_offset.Uint32Value() + 4813 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4814 ? sizeof(uint64_t) 4815 : sizeof(uint32_t))); 4816 current_field++; 4817 } 4818 4819 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4820 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4821 // We know there are no non-reference fields in the Reference classes, and we know 4822 // that 'referent' is alphabetically last, so this is easy... 4823 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4824 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4825 --num_reference_fields; 4826 } 4827 4828 if (kIsDebugBuild) { 4829 // Make sure that all reference fields appear before 4830 // non-reference fields, and all double-wide fields are aligned. 4831 bool seen_non_ref = false; 4832 for (size_t i = 0; i < num_fields; i++) { 4833 mirror::ArtField* field = fields->Get(i); 4834 if (false) { // enable to debug field layout 4835 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4836 << " class=" << PrettyClass(klass.Get()) 4837 << " field=" << PrettyField(field) 4838 << " offset=" 4839 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4840 } 4841 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4842 bool is_primitive = type != Primitive::kPrimNot; 4843 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4844 strcmp("referent", field->GetName()) == 0) { 4845 is_primitive = true; // We lied above, so we have to expect a lie here. 4846 } 4847 if (is_primitive) { 4848 if (!seen_non_ref) { 4849 seen_non_ref = true; 4850 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4851 } 4852 } else { 4853 DCHECK(!seen_non_ref) << PrettyField(field); 4854 } 4855 } 4856 if (!seen_non_ref) { 4857 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4858 } 4859 } 4860 4861 size_t size = field_offset.Uint32Value(); 4862 // Update klass 4863 if (is_static) { 4864 klass->SetNumReferenceStaticFields(num_reference_fields); 4865 *class_size = size; 4866 } else { 4867 klass->SetNumReferenceInstanceFields(num_reference_fields); 4868 if (!klass->IsVariableSize()) { 4869 std::string temp; 4870 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 4871 size_t previous_size = klass->GetObjectSize(); 4872 if (previous_size != 0) { 4873 // Make sure that we didn't originally have an incorrect size. 4874 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 4875 } 4876 klass->SetObjectSize(size); 4877 } 4878 } 4879 return true; 4880} 4881 4882// Set the bitmap of reference offsets, refOffsets, from the ifields 4883// list. 4884void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4885 uint32_t reference_offsets = 0; 4886 mirror::Class* super_class = klass->GetSuperClass(); 4887 if (super_class != NULL) { 4888 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4889 // If our superclass overflowed, we don't stand a chance. 4890 if (reference_offsets == CLASS_WALK_SUPER) { 4891 klass->SetReferenceInstanceOffsets(reference_offsets); 4892 return; 4893 } 4894 } 4895 CreateReferenceOffsets(klass, false, reference_offsets); 4896} 4897 4898void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4899 CreateReferenceOffsets(klass, true, 0); 4900} 4901 4902void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4903 uint32_t reference_offsets) { 4904 size_t num_reference_fields = 4905 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4906 : klass->NumReferenceInstanceFieldsDuringLinking(); 4907 mirror::ObjectArray<mirror::ArtField>* fields = 4908 is_static ? klass->GetSFields() : klass->GetIFields(); 4909 // All of the fields that contain object references are guaranteed 4910 // to be at the beginning of the fields list. 4911 for (size_t i = 0; i < num_reference_fields; ++i) { 4912 // Note that byte_offset is the offset from the beginning of 4913 // object, not the offset into instance data 4914 mirror::ArtField* field = fields->Get(i); 4915 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4916 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4917 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4918 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4919 CHECK_NE(new_bit, 0U); 4920 reference_offsets |= new_bit; 4921 } else { 4922 reference_offsets = CLASS_WALK_SUPER; 4923 break; 4924 } 4925 } 4926 // Update fields in klass 4927 if (is_static) { 4928 klass->SetReferenceStaticOffsets(reference_offsets); 4929 } else { 4930 klass->SetReferenceInstanceOffsets(reference_offsets); 4931 } 4932} 4933 4934mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4935 Handle<mirror::DexCache> dex_cache) { 4936 DCHECK(dex_cache.Get() != nullptr); 4937 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4938 if (resolved != NULL) { 4939 return resolved; 4940 } 4941 uint32_t utf16_length; 4942 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4943 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4944 dex_cache->SetResolvedString(string_idx, string); 4945 return string; 4946} 4947 4948mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4949 mirror::Class* referrer) { 4950 StackHandleScope<2> hs(Thread::Current()); 4951 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4952 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4953 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4954} 4955 4956mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4957 Handle<mirror::DexCache> dex_cache, 4958 Handle<mirror::ClassLoader> class_loader) { 4959 DCHECK(dex_cache.Get() != NULL); 4960 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4961 if (resolved == NULL) { 4962 Thread* self = Thread::Current(); 4963 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4964 resolved = FindClass(self, descriptor, class_loader); 4965 if (resolved != NULL) { 4966 // TODO: we used to throw here if resolved's class loader was not the 4967 // boot class loader. This was to permit different classes with the 4968 // same name to be loaded simultaneously by different loaders 4969 dex_cache->SetResolvedType(type_idx, resolved); 4970 } else { 4971 CHECK(self->IsExceptionPending()) 4972 << "Expected pending exception for failed resolution of: " << descriptor; 4973 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4974 StackHandleScope<1> hs(self); 4975 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4976 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4977 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4978 self->ClearException(); 4979 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4980 self->GetException(NULL)->SetCause(cause.Get()); 4981 } 4982 } 4983 } 4984 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4985 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4986 return resolved; 4987} 4988 4989mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 4990 Handle<mirror::DexCache> dex_cache, 4991 Handle<mirror::ClassLoader> class_loader, 4992 Handle<mirror::ArtMethod> referrer, 4993 InvokeType type) { 4994 DCHECK(dex_cache.Get() != nullptr); 4995 // Check for hit in the dex cache. 4996 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4997 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 4998 return resolved; 4999 } 5000 // Fail, get the declaring class. 5001 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5002 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 5003 if (klass == nullptr) { 5004 DCHECK(Thread::Current()->IsExceptionPending()); 5005 return nullptr; 5006 } 5007 // Scan using method_idx, this saves string compares but will only hit for matching dex 5008 // caches/files. 5009 switch (type) { 5010 case kDirect: // Fall-through. 5011 case kStatic: 5012 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5013 break; 5014 case kInterface: 5015 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5016 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5017 break; 5018 case kSuper: // Fall-through. 5019 case kVirtual: 5020 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5021 break; 5022 default: 5023 LOG(FATAL) << "Unreachable - invocation type: " << type; 5024 } 5025 if (resolved == nullptr) { 5026 // Search by name, which works across dex files. 5027 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5028 const Signature signature = dex_file.GetMethodSignature(method_id); 5029 switch (type) { 5030 case kDirect: // Fall-through. 5031 case kStatic: 5032 resolved = klass->FindDirectMethod(name, signature); 5033 break; 5034 case kInterface: 5035 resolved = klass->FindInterfaceMethod(name, signature); 5036 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5037 break; 5038 case kSuper: // Fall-through. 5039 case kVirtual: 5040 resolved = klass->FindVirtualMethod(name, signature); 5041 break; 5042 } 5043 } 5044 // If we found a method, check for incompatible class changes. 5045 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5046 // Be a good citizen and update the dex cache to speed subsequent calls. 5047 dex_cache->SetResolvedMethod(method_idx, resolved); 5048 return resolved; 5049 } else { 5050 // If we had a method, it's an incompatible-class-change error. 5051 if (resolved != nullptr) { 5052 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5053 } else { 5054 // We failed to find the method which means either an access error, an incompatible class 5055 // change, or no such method. First try to find the method among direct and virtual methods. 5056 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5057 const Signature signature = dex_file.GetMethodSignature(method_id); 5058 switch (type) { 5059 case kDirect: 5060 case kStatic: 5061 resolved = klass->FindVirtualMethod(name, signature); 5062 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5063 // have had a resolved method before, which triggers the "true" branch above. 5064 break; 5065 case kInterface: 5066 case kVirtual: 5067 case kSuper: 5068 resolved = klass->FindDirectMethod(name, signature); 5069 break; 5070 } 5071 5072 // If we found something, check that it can be accessed by the referrer. 5073 if (resolved != nullptr && referrer.Get() != nullptr) { 5074 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5075 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5076 if (!referring_class->CanAccess(methods_class)) { 5077 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5078 resolved, type); 5079 return nullptr; 5080 } else if (!referring_class->CanAccessMember(methods_class, 5081 resolved->GetAccessFlags())) { 5082 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5083 return nullptr; 5084 } 5085 } 5086 5087 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 5088 // methods and throw if we find the method there. If we find nothing, throw a 5089 // NoSuchMethodError. 5090 switch (type) { 5091 case kDirect: 5092 case kStatic: 5093 if (resolved != nullptr) { 5094 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5095 } else { 5096 resolved = klass->FindInterfaceMethod(name, signature); 5097 if (resolved != nullptr) { 5098 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5099 } else { 5100 ThrowNoSuchMethodError(type, klass, name, signature); 5101 } 5102 } 5103 break; 5104 case kInterface: 5105 if (resolved != nullptr) { 5106 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5107 } else { 5108 resolved = klass->FindVirtualMethod(name, signature); 5109 if (resolved != nullptr) { 5110 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5111 } else { 5112 ThrowNoSuchMethodError(type, klass, name, signature); 5113 } 5114 } 5115 break; 5116 case kSuper: 5117 if (resolved != nullptr) { 5118 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5119 } else { 5120 ThrowNoSuchMethodError(type, klass, name, signature); 5121 } 5122 break; 5123 case kVirtual: 5124 if (resolved != nullptr) { 5125 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5126 } else { 5127 resolved = klass->FindInterfaceMethod(name, signature); 5128 if (resolved != nullptr) { 5129 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5130 } else { 5131 ThrowNoSuchMethodError(type, klass, name, signature); 5132 } 5133 } 5134 break; 5135 } 5136 } 5137 DCHECK(Thread::Current()->IsExceptionPending()); 5138 return nullptr; 5139 } 5140} 5141 5142mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5143 Handle<mirror::DexCache> dex_cache, 5144 Handle<mirror::ClassLoader> class_loader, 5145 bool is_static) { 5146 DCHECK(dex_cache.Get() != nullptr); 5147 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5148 if (resolved != nullptr) { 5149 return resolved; 5150 } 5151 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5152 Thread* const self = Thread::Current(); 5153 StackHandleScope<1> hs(self); 5154 Handle<mirror::Class> klass( 5155 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5156 if (klass.Get() == nullptr) { 5157 DCHECK(Thread::Current()->IsExceptionPending()); 5158 return nullptr; 5159 } 5160 5161 if (is_static) { 5162 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5163 } else { 5164 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5165 } 5166 5167 if (resolved == nullptr) { 5168 const char* name = dex_file.GetFieldName(field_id); 5169 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5170 if (is_static) { 5171 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5172 } else { 5173 resolved = klass->FindInstanceField(name, type); 5174 } 5175 if (resolved == nullptr) { 5176 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5177 return NULL; 5178 } 5179 } 5180 dex_cache->SetResolvedField(field_idx, resolved); 5181 return resolved; 5182} 5183 5184mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5185 uint32_t field_idx, 5186 Handle<mirror::DexCache> dex_cache, 5187 Handle<mirror::ClassLoader> class_loader) { 5188 DCHECK(dex_cache.Get() != nullptr); 5189 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5190 if (resolved != nullptr) { 5191 return resolved; 5192 } 5193 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5194 Thread* self = Thread::Current(); 5195 StackHandleScope<1> hs(self); 5196 Handle<mirror::Class> klass( 5197 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5198 if (klass.Get() == NULL) { 5199 DCHECK(Thread::Current()->IsExceptionPending()); 5200 return NULL; 5201 } 5202 5203 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5204 StringPiece type(dex_file.StringDataByIdx( 5205 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5206 resolved = mirror::Class::FindField(self, klass, name, type); 5207 if (resolved != NULL) { 5208 dex_cache->SetResolvedField(field_idx, resolved); 5209 } else { 5210 ThrowNoSuchFieldError("", klass.Get(), type, name); 5211 } 5212 return resolved; 5213} 5214 5215const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5216 uint32_t* length) { 5217 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5218 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5219 const DexFile& dex_file = *dex_cache->GetDexFile(); 5220 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5221 return dex_file.GetMethodShorty(method_id, length); 5222} 5223 5224void ClassLinker::DumpAllClasses(int flags) { 5225 if (dex_cache_image_class_lookup_required_) { 5226 MoveImageClassesToClassTable(); 5227 } 5228 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5229 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5230 std::vector<mirror::Class*> all_classes; 5231 { 5232 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5233 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5234 mirror::Class* klass = it.second.Read(); 5235 all_classes.push_back(klass); 5236 } 5237 } 5238 5239 for (size_t i = 0; i < all_classes.size(); ++i) { 5240 all_classes[i]->DumpClass(std::cerr, flags); 5241 } 5242} 5243 5244void ClassLinker::DumpForSigQuit(std::ostream& os) { 5245 if (dex_cache_image_class_lookup_required_) { 5246 MoveImageClassesToClassTable(); 5247 } 5248 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5249 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5250} 5251 5252size_t ClassLinker::NumLoadedClasses() { 5253 if (dex_cache_image_class_lookup_required_) { 5254 MoveImageClassesToClassTable(); 5255 } 5256 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5257 return class_table_.size(); 5258} 5259 5260pid_t ClassLinker::GetClassesLockOwner() { 5261 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5262} 5263 5264pid_t ClassLinker::GetDexLockOwner() { 5265 return dex_lock_.GetExclusiveOwnerTid(); 5266} 5267 5268void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5269 DCHECK(!init_done_); 5270 5271 DCHECK(klass != NULL); 5272 DCHECK(klass->GetClassLoader() == NULL); 5273 5274 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5275 DCHECK(class_roots != NULL); 5276 DCHECK(class_roots->Get(class_root) == NULL); 5277 class_roots->Set<false>(class_root, klass); 5278} 5279 5280} // namespace art 5281