class_linker.cc revision 998ee7d0f62a1ee7efaaad49e728d19c38b4c9c3
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() != nullptr) { 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() != nullptr); 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;", 127 nullptr); 128 } 129} 130 131static size_t Hash(const char* s) { 132 // This is the java.lang.String hashcode for convenience, not interoperability. 133 size_t hash = 0; 134 for (; *s != '\0'; ++s) { 135 hash = hash * 31 + *s; 136 } 137 return hash; 138} 139 140const char* ClassLinker::class_roots_descriptors_[] = { 141 "Ljava/lang/Class;", 142 "Ljava/lang/Object;", 143 "[Ljava/lang/Class;", 144 "[Ljava/lang/Object;", 145 "Ljava/lang/String;", 146 "Ljava/lang/DexCache;", 147 "Ljava/lang/ref/Reference;", 148 "Ljava/lang/reflect/ArtField;", 149 "Ljava/lang/reflect/ArtMethod;", 150 "Ljava/lang/reflect/Proxy;", 151 "[Ljava/lang/String;", 152 "[Ljava/lang/reflect/ArtField;", 153 "[Ljava/lang/reflect/ArtMethod;", 154 "Ljava/lang/ClassLoader;", 155 "Ljava/lang/Throwable;", 156 "Ljava/lang/ClassNotFoundException;", 157 "Ljava/lang/StackTraceElement;", 158 "Z", 159 "B", 160 "C", 161 "D", 162 "F", 163 "I", 164 "J", 165 "S", 166 "V", 167 "[Z", 168 "[B", 169 "[C", 170 "[D", 171 "[F", 172 "[I", 173 "[J", 174 "[S", 175 "[Ljava/lang/StackTraceElement;", 176}; 177 178ClassLinker::ClassLinker(InternTable* intern_table) 179 // dex_lock_ is recursive as it may be used in stack dumping. 180 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 181 dex_cache_image_class_lookup_required_(false), 182 failed_dex_cache_class_lookups_(0), 183 class_roots_(nullptr), 184 array_iftable_(nullptr), 185 find_array_class_cache_next_victim_(0), 186 init_done_(false), 187 log_new_dex_caches_roots_(false), 188 log_new_class_table_roots_(false), 189 intern_table_(intern_table), 190 portable_resolution_trampoline_(nullptr), 191 quick_resolution_trampoline_(nullptr), 192 portable_imt_conflict_trampoline_(nullptr), 193 quick_imt_conflict_trampoline_(nullptr), 194 quick_generic_jni_trampoline_(nullptr), 195 quick_to_interpreter_bridge_trampoline_(nullptr) { 196 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 197 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 198} 199 200// To set a value for generic JNI. May be necessary in compiler tests. 201extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 202extern "C" void art_quick_resolution_trampoline(mirror::ArtMethod*); 203extern "C" void art_quick_imt_conflict_trampoline(mirror::ArtMethod*); 204extern "C" void art_quick_to_interpreter_bridge(mirror::ArtMethod*); 205 206void ClassLinker::InitWithoutImage(const std::vector<const DexFile*>& boot_class_path) { 207 VLOG(startup) << "ClassLinker::Init"; 208 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 209 210 CHECK(!init_done_); 211 212 // java_lang_Class comes first, it's needed for AllocClass 213 Thread* self = Thread::Current(); 214 gc::Heap* heap = Runtime::Current()->GetHeap(); 215 // The GC can't handle an object with a null class since we can't get the size of this object. 216 heap->IncrementDisableMovingGC(self); 217 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 218 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 219 heap->AllocNonMovableObject<true>(self, nullptr, 220 mirror::Class::ClassClassSize(), 221 VoidFunctor())))); 222 CHECK(java_lang_Class.Get() != nullptr); 223 mirror::Class::SetClassClass(java_lang_Class.Get()); 224 java_lang_Class->SetClass(java_lang_Class.Get()); 225 if (kUseBakerOrBrooksReadBarrier) { 226 java_lang_Class->AssertReadBarrierPointer(); 227 } 228 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 229 heap->DecrementDisableMovingGC(self); 230 // AllocClass(mirror::Class*) can now be used 231 232 // Class[] is used for reflection support. 233 Handle<mirror::Class> class_array_class(hs.NewHandle( 234 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 235 class_array_class->SetComponentType(java_lang_Class.Get()); 236 237 // java_lang_Object comes next so that object_array_class can be created. 238 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 239 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 240 CHECK(java_lang_Object.Get() != nullptr); 241 // backfill Object as the super class of Class. 242 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 243 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 244 245 // Object[] next to hold class roots. 246 Handle<mirror::Class> object_array_class(hs.NewHandle( 247 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 248 object_array_class->SetComponentType(java_lang_Object.Get()); 249 250 // Setup the char (primitive) class to be used for char[]. 251 Handle<mirror::Class> char_class(hs.NewHandle( 252 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 253 254 // Setup the char[] class to be used for String. 255 Handle<mirror::Class> char_array_class(hs.NewHandle( 256 AllocClass(self, java_lang_Class.Get(), 257 mirror::Array::ClassSize()))); 258 char_array_class->SetComponentType(char_class.Get()); 259 mirror::CharArray::SetArrayClass(char_array_class.Get()); 260 261 // Setup String. 262 Handle<mirror::Class> java_lang_String(hs.NewHandle( 263 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 264 mirror::String::SetClass(java_lang_String.Get()); 265 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 266 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 267 268 // Setup Reference. 269 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 270 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 271 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 272 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 273 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 274 275 // Create storage for root classes, save away our work so far (requires descriptors). 276 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 277 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 278 kClassRootsMax)); 279 CHECK(!class_roots_.IsNull()); 280 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 281 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 282 SetClassRoot(kClassArrayClass, class_array_class.Get()); 283 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 284 SetClassRoot(kCharArrayClass, char_array_class.Get()); 285 SetClassRoot(kJavaLangString, java_lang_String.Get()); 286 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 287 288 // Setup the primitive type classes. 289 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 290 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 291 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 292 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 293 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 294 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 295 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 296 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 297 298 // Create array interface entries to populate once we can load system classes. 299 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 300 301 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 302 Handle<mirror::Class> int_array_class(hs.NewHandle( 303 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 304 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 305 mirror::IntArray::SetArrayClass(int_array_class.Get()); 306 SetClassRoot(kIntArrayClass, int_array_class.Get()); 307 308 // now that these are registered, we can use AllocClass() and AllocObjectArray 309 310 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 311 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 312 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 313 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 314 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 315 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 316 317 // Constructor, Field, Method, and AbstractMethod are necessary so 318 // that FindClass can link members. 319 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 320 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 321 CHECK(java_lang_reflect_ArtField.Get() != nullptr); 322 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 323 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 324 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 325 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 326 327 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 328 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 329 CHECK(java_lang_reflect_ArtMethod.Get() != nullptr); 330 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 331 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 332 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 333 334 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 335 336 // Set up array classes for string, field, method 337 Handle<mirror::Class> object_array_string(hs.NewHandle( 338 AllocClass(self, java_lang_Class.Get(), 339 mirror::ObjectArray<mirror::String>::ClassSize()))); 340 object_array_string->SetComponentType(java_lang_String.Get()); 341 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 342 343 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 344 AllocClass(self, java_lang_Class.Get(), 345 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 346 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 347 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 348 349 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 350 AllocClass(self, java_lang_Class.Get(), 351 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 352 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 353 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 354 355 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 356 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 357 // these roots. 358 CHECK_NE(0U, boot_class_path.size()); 359 for (size_t i = 0; i != boot_class_path.size(); ++i) { 360 const DexFile* dex_file = boot_class_path[i]; 361 CHECK(dex_file != nullptr); 362 AppendToBootClassPath(*dex_file); 363 } 364 365 // now we can use FindSystemClass 366 367 // run char class through InitializePrimitiveClass to finish init 368 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 369 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 370 371 // Create runtime resolution and imt conflict methods. Also setup the default imt. 372 Runtime* runtime = Runtime::Current(); 373 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 374 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 375 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 376 377 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 378 // we do not need friend classes or a publicly exposed setter. 379 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 380 if (!runtime->IsCompiler()) { 381 // We need to set up the generic trampolines since we don't have an image. 382 quick_resolution_trampoline_ = reinterpret_cast<void*>(art_quick_resolution_trampoline); 383 quick_imt_conflict_trampoline_ = reinterpret_cast<void*>(art_quick_imt_conflict_trampoline); 384 quick_to_interpreter_bridge_trampoline_ = reinterpret_cast<void*>(art_quick_to_interpreter_bridge); 385 } 386 387 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 388 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 389 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 390 CHECK_EQ(java_lang_Object.Get(), Object_class); 391 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 392 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 393 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 394 std::ostringstream os1, os2; 395 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 396 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 397 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 398 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 399 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 400 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 401 CHECK_EQ(java_lang_String.Get(), String_class); 402 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 403 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 404 405 // Setup the primitive array type classes - can't be done until Object has a vtable. 406 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 407 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 408 409 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 410 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 411 412 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 413 CHECK_EQ(char_array_class.Get(), found_char_array_class); 414 415 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 416 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 417 418 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 419 CHECK_EQ(int_array_class.Get(), found_int_array_class); 420 421 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 422 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 423 424 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 425 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 426 427 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 428 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 429 430 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 431 CHECK_EQ(class_array_class.Get(), found_class_array_class); 432 433 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 434 CHECK_EQ(object_array_class.Get(), found_object_array_class); 435 436 // Setup the single, global copy of "iftable". 437 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 438 CHECK(java_lang_Cloneable != nullptr); 439 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 440 CHECK(java_io_Serializable != nullptr); 441 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 442 // crawl up and explicitly list all of the supers as well. 443 { 444 mirror::IfTable* array_iftable = array_iftable_.Read(); 445 array_iftable->SetInterface(0, java_lang_Cloneable); 446 array_iftable->SetInterface(1, java_io_Serializable); 447 } 448 449 // Sanity check Class[] and Object[]'s interfaces. 450 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 451 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 452 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 453 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 454 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 455 // dex_cache_ fields and register them in class_table_. 456 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 457 CHECK_EQ(java_lang_Class.Get(), Class_class); 458 459 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 460 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 461 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 462 463 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 464 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 465 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 466 467 mirror::Class* String_array_class = 468 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 469 CHECK_EQ(object_array_string.Get(), String_array_class); 470 471 mirror::Class* Art_method_array_class = 472 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 473 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 474 475 mirror::Class* Art_field_array_class = 476 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 477 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 478 479 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 480 481 // Create java.lang.reflect.Proxy root. 482 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 483 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 484 485 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 486 // finish initializing Reference class 487 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 488 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 489 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 490 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 491 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 492 mirror::Class* java_lang_ref_FinalizerReference = 493 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 494 java_lang_ref_FinalizerReference->SetAccessFlags( 495 java_lang_ref_FinalizerReference->GetAccessFlags() | 496 kAccClassIsReference | kAccClassIsFinalizerReference); 497 mirror::Class* java_lang_ref_PhantomReference = 498 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 499 java_lang_ref_PhantomReference->SetAccessFlags( 500 java_lang_ref_PhantomReference->GetAccessFlags() | 501 kAccClassIsReference | kAccClassIsPhantomReference); 502 mirror::Class* java_lang_ref_SoftReference = 503 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 504 java_lang_ref_SoftReference->SetAccessFlags( 505 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 506 mirror::Class* java_lang_ref_WeakReference = 507 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 508 java_lang_ref_WeakReference->SetAccessFlags( 509 java_lang_ref_WeakReference->GetAccessFlags() | 510 kAccClassIsReference | kAccClassIsWeakReference); 511 512 // Setup the ClassLoader, verifying the object_size_. 513 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 514 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 515 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 516 517 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 518 // java.lang.StackTraceElement as a convenience. 519 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 520 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 521 SetClassRoot(kJavaLangClassNotFoundException, 522 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 523 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 524 SetClassRoot(kJavaLangStackTraceElementArrayClass, 525 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 526 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 527 528 FinishInit(self); 529 530 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 531} 532 533void ClassLinker::FinishInit(Thread* self) { 534 VLOG(startup) << "ClassLinker::FinishInit entering"; 535 536 // Let the heap know some key offsets into java.lang.ref instances 537 // Note: we hard code the field indexes here rather than using FindInstanceField 538 // as the types of the field can't be resolved prior to the runtime being 539 // fully initialized 540 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 541 mirror::Class* java_lang_ref_FinalizerReference = 542 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 543 544 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 545 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 546 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 547 548 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 549 CHECK_STREQ(queue->GetName(), "queue"); 550 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 551 552 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 553 CHECK_STREQ(queueNext->GetName(), "queueNext"); 554 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 555 556 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 557 CHECK_STREQ(referent->GetName(), "referent"); 558 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 559 560 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 561 CHECK_STREQ(zombie->GetName(), "zombie"); 562 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 563 564 // ensure all class_roots_ are initialized 565 for (size_t i = 0; i < kClassRootsMax; i++) { 566 ClassRoot class_root = static_cast<ClassRoot>(i); 567 mirror::Class* klass = GetClassRoot(class_root); 568 CHECK(klass != nullptr); 569 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != nullptr); 570 // note SetClassRoot does additional validation. 571 // if possible add new checks there to catch errors early 572 } 573 574 CHECK(!array_iftable_.IsNull()); 575 576 // disable the slow paths in FindClass and CreatePrimitiveClass now 577 // that Object, Class, and Object[] are setup 578 init_done_ = true; 579 580 VLOG(startup) << "ClassLinker::FinishInit exiting"; 581} 582 583void ClassLinker::RunRootClinits() { 584 Thread* self = Thread::Current(); 585 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 586 mirror::Class* c = GetClassRoot(ClassRoot(i)); 587 if (!c->IsArrayClass() && !c->IsPrimitive()) { 588 StackHandleScope<1> hs(self); 589 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 590 EnsureInitialized(h_class, true, true); 591 self->AssertNoPendingException(); 592 } 593 } 594} 595 596bool ClassLinker::GenerateOatFile(const char* dex_filename, 597 int oat_fd, 598 const char* oat_cache_filename, 599 std::string* error_msg) { 600 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 601 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 602 603 gc::Heap* heap = Runtime::Current()->GetHeap(); 604 std::string boot_image_option("--boot-image="); 605 if (heap->GetImageSpace() == nullptr) { 606 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 607 // out of space anyway it might not matter. 608 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 609 "without an image.", dex_filename); 610 return false; 611 } 612 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 613 614 std::string dex_file_option("--dex-file="); 615 dex_file_option += dex_filename; 616 617 std::string oat_fd_option("--oat-fd="); 618 StringAppendF(&oat_fd_option, "%d", oat_fd); 619 620 std::string oat_location_option("--oat-location="); 621 oat_location_option += oat_cache_filename; 622 623 std::vector<std::string> argv; 624 argv.push_back(dex2oat); 625 argv.push_back("--runtime-arg"); 626 argv.push_back("-classpath"); 627 argv.push_back("--runtime-arg"); 628 argv.push_back(Runtime::Current()->GetClassPathString()); 629 630 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 631 632 if (!Runtime::Current()->IsVerificationEnabled()) { 633 argv.push_back("--compiler-filter=verify-none"); 634 } 635 636 if (Runtime::Current()->MustRelocateIfPossible()) { 637 argv.push_back("--runtime-arg"); 638 argv.push_back("-Xrelocate"); 639 } else { 640 argv.push_back("--runtime-arg"); 641 argv.push_back("-Xnorelocate"); 642 } 643 644 if (!kIsTargetBuild) { 645 argv.push_back("--host"); 646 } 647 648 argv.push_back(boot_image_option); 649 argv.push_back(dex_file_option); 650 argv.push_back(oat_fd_option); 651 argv.push_back(oat_location_option); 652 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 653 for (size_t i = 0; i < compiler_options.size(); ++i) { 654 argv.push_back(compiler_options[i].c_str()); 655 } 656 657 return Exec(argv, error_msg); 658} 659 660const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 661 WriterMutexLock mu(Thread::Current(), dex_lock_); 662 if (kIsDebugBuild) { 663 for (size_t i = 0; i < oat_files_.size(); ++i) { 664 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 665 } 666 } 667 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 668 oat_files_.push_back(oat_file); 669 return oat_file; 670} 671 672OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 673 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 674 OatFile* oat_file = space->ReleaseOatFile(); 675 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 676 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 677 return *oat_file; 678} 679 680const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFileForDexFile(const DexFile& dex_file) { 681 const char* dex_location = dex_file.GetLocation().c_str(); 682 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 683 return FindOpenedOatDexFile(nullptr, dex_location, &dex_location_checksum); 684} 685 686const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFile(const char* oat_location, 687 const char* dex_location, 688 const uint32_t* dex_location_checksum) { 689 ReaderMutexLock mu(Thread::Current(), dex_lock_); 690 for (const OatFile* oat_file : oat_files_) { 691 DCHECK(oat_file != nullptr); 692 693 if (oat_location != nullptr) { 694 if (oat_file->GetLocation() != oat_location) { 695 continue; 696 } 697 } 698 699 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 700 dex_location_checksum, 701 false); 702 if (oat_dex_file != nullptr) { 703 return oat_dex_file; 704 } 705 } 706 return nullptr; 707} 708 709 710// Loads all multi dex files from the given oat file returning true on success. 711// 712// Parameters: 713// oat_file - the oat file to load from 714// dex_location - the dex location used to generate the oat file 715// dex_location_checksum - the checksum of the dex_location (may be null for pre-opted files) 716// generated - whether or not the oat_file existed before or was just (re)generated 717// error_msgs - any error messages will be appended here 718// dex_files - the loaded dex_files will be appended here (only if the loading succeeds) 719static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, 720 const char* dex_location, 721 const uint32_t* dex_location_checksum, 722 bool generated, 723 std::vector<std::string>* error_msgs, 724 std::vector<const DexFile*>* dex_files) { 725 if (oat_file == nullptr) { 726 return false; 727 } 728 729 size_t old_size = dex_files->size(); // To rollback on error. 730 731 bool success = true; 732 for (size_t i = 0; success; ++i) { 733 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 734 const char* next_name = next_name_str.c_str(); 735 736 uint32_t next_location_checksum; 737 uint32_t* next_location_checksum_pointer = &next_location_checksum; 738 std::string error_msg; 739 if ((i == 0) && (strcmp(next_name, dex_location) == 0)) { 740 // When i=0 the multidex name should be the same as the location name. We already have the 741 // checksum it so we don't need to recompute it. 742 if (dex_location_checksum == nullptr) { 743 next_location_checksum_pointer = nullptr; 744 } else { 745 next_location_checksum = *dex_location_checksum; 746 } 747 } else if (!DexFile::GetChecksum(next_name, next_location_checksum_pointer, &error_msg)) { 748 DCHECK_EQ(false, i == 0 && generated); 749 next_location_checksum_pointer = nullptr; 750 } 751 752 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 753 754 if (oat_dex_file == nullptr) { 755 if (i == 0 && generated) { 756 std::string error_msg; 757 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 758 " file'%s'", dex_location, next_location_checksum, 759 oat_file->GetLocation().c_str()); 760 error_msgs->push_back(error_msg); 761 } 762 break; // Not found, done. 763 } 764 765 // Checksum test. Test must succeed when generated. 766 success = !generated; 767 if (next_location_checksum_pointer != nullptr) { 768 success = next_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 769 } 770 771 if (success) { 772 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 773 if (dex_file == nullptr) { 774 success = false; 775 error_msgs->push_back(error_msg); 776 } else { 777 dex_files->push_back(dex_file); 778 } 779 } 780 781 // When we generated the file, we expect success, or something is terribly wrong. 782 CHECK_EQ(false, generated && !success) 783 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 784 << std::hex << " dex_location_checksum=" << next_location_checksum 785 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 786 } 787 788 if (dex_files->size() == old_size) { 789 success = false; // We did not even find classes.dex 790 } 791 792 if (success) { 793 return true; 794 } else { 795 // Free all the dex files we have loaded. 796 auto it = dex_files->begin() + old_size; 797 auto it_end = dex_files->end(); 798 for (; it != it_end; it++) { 799 delete *it; 800 } 801 dex_files->erase(dex_files->begin() + old_size, it_end); 802 803 return false; 804 } 805} 806 807// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 808// complicates the loading process, as we should not use an iterative loading process, because that 809// would register the oat file and dex files that come before the broken one. Instead, check all 810// multidex ahead of time. 811bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 812 std::vector<std::string>* error_msgs, 813 std::vector<const DexFile*>* dex_files) { 814 // 1) Check whether we have an open oat file. 815 // This requires a dex checksum, use the "primary" one. 816 uint32_t dex_location_checksum; 817 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 818 bool have_checksum = true; 819 std::string checksum_error_msg; 820 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 821 // This happens for pre-opted files since the corresponding dex files are no longer on disk. 822 dex_location_checksum_pointer = nullptr; 823 have_checksum = false; 824 } 825 826 bool needs_registering = false; 827 828 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFile(oat_location, dex_location, 829 dex_location_checksum_pointer); 830 std::unique_ptr<const OatFile> open_oat_file( 831 oat_dex_file != nullptr ? oat_dex_file->GetOatFile() : nullptr); 832 833 // 2) If we do not have an open one, maybe there's one on disk already. 834 835 // In case the oat file is not open, we play a locking game here so 836 // that if two different processes race to load and register or generate 837 // (or worse, one tries to open a partial generated file) we will be okay. 838 // This is actually common with apps that use DexClassLoader to work 839 // around the dex method reference limit and that have a background 840 // service running in a separate process. 841 ScopedFlock scoped_flock; 842 843 if (open_oat_file.get() == nullptr) { 844 if (oat_location != nullptr) { 845 // Can only do this if we have a checksum, else error. 846 if (!have_checksum) { 847 error_msgs->push_back(checksum_error_msg); 848 return false; 849 } 850 851 std::string error_msg; 852 853 // We are loading or creating one in the future. Time to set up the file lock. 854 if (!scoped_flock.Init(oat_location, &error_msg)) { 855 error_msgs->push_back(error_msg); 856 return false; 857 } 858 859 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 860 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 861 oat_location, &error_msg)); 862 863 if (open_oat_file.get() == nullptr) { 864 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 865 dex_location, oat_location, error_msg.c_str()); 866 VLOG(class_linker) << compound_msg; 867 error_msgs->push_back(compound_msg); 868 } 869 } else { 870 // TODO: What to lock here? 871 bool obsolete_file_cleanup_failed; 872 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 873 dex_location_checksum_pointer, 874 kRuntimeISA, error_msgs, 875 &obsolete_file_cleanup_failed)); 876 // There's no point in going forward and eventually try to regenerate the 877 // file if we couldn't remove the obsolete one. Mostly likely we will fail 878 // with the same error when trying to write the new file. 879 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 880 if (obsolete_file_cleanup_failed) { 881 return false; 882 } 883 } 884 needs_registering = true; 885 } 886 887 // 3) If we have an oat file, check all contained multidex files for our dex_location. 888 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 889 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 890 dex_location_checksum_pointer, 891 false, error_msgs, dex_files); 892 if (success) { 893 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 894 if (needs_registering) { 895 // We opened the oat file, so we must register it. 896 RegisterOatFile(oat_file); 897 } 898 // If the file isn't executable we failed patchoat but did manage to get the dex files. 899 return oat_file->IsExecutable(); 900 } else { 901 if (needs_registering) { 902 // We opened it, delete it. 903 open_oat_file.reset(); 904 } else { 905 open_oat_file.release(); // Do not delete open oat files. 906 } 907 } 908 909 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 910 911 // Need a checksum, fail else. 912 if (!have_checksum) { 913 error_msgs->push_back(checksum_error_msg); 914 return false; 915 } 916 917 // Look in cache location if no oat_location is given. 918 std::string cache_location; 919 if (oat_location == nullptr) { 920 // Use the dalvik cache. 921 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 922 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 923 oat_location = cache_location.c_str(); 924 } 925 926 bool has_flock = true; 927 // Definitely need to lock now. 928 if (!scoped_flock.HasFile()) { 929 std::string error_msg; 930 if (!scoped_flock.Init(oat_location, &error_msg)) { 931 error_msgs->push_back(error_msg); 932 has_flock = false; 933 } 934 } 935 936 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 937 // Create the oat file. 938 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 939 oat_location, error_msgs)); 940 } 941 942 // Failed, bail. 943 if (open_oat_file.get() == nullptr) { 944 std::string error_msg; 945 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 946 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 947 error_msgs->push_back(error_msg); 948 return false; 949 } 950 951 // Try to load again, but stronger checks. 952 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 953 dex_location_checksum_pointer, 954 true, error_msgs, dex_files); 955 if (success) { 956 RegisterOatFile(open_oat_file.release()); 957 return true; 958 } else { 959 return false; 960 } 961} 962 963const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 964 uint32_t dex_location_checksum, 965 const char* oat_location, 966 std::string* error_msg) { 967 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, 968 !Runtime::Current()->IsCompiler(), 969 error_msg)); 970 if (oat_file.get() == nullptr) { 971 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 972 error_msg->c_str()); 973 return nullptr; 974 } 975 Runtime* runtime = Runtime::Current(); 976 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 977 if (image_space != nullptr) { 978 const ImageHeader& image_header = image_space->GetImageHeader(); 979 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 980 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 981 if (expected_image_oat_checksum != actual_image_oat_checksum) { 982 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 983 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 984 actual_image_oat_checksum); 985 return nullptr; 986 } 987 988 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 989 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 990 if (expected_image_oat_offset != actual_image_oat_offset) { 991 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 992 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 993 actual_image_oat_offset); 994 return nullptr; 995 } 996 int32_t expected_patch_delta = image_header.GetPatchDelta(); 997 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 998 if (expected_patch_delta != actual_patch_delta) { 999 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 1000 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 1001 return nullptr; 1002 } 1003 } 1004 1005 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1006 &dex_location_checksum); 1007 if (oat_dex_file == nullptr) { 1008 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 1009 dex_location); 1010 return nullptr; 1011 } 1012 uint32_t expected_dex_checksum = dex_location_checksum; 1013 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 1014 if (expected_dex_checksum != actual_dex_checksum) { 1015 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 1016 "found 0x%x", oat_location, expected_dex_checksum, 1017 actual_dex_checksum); 1018 return nullptr; 1019 } 1020 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 1021 if (dex_file.get() != nullptr) { 1022 return oat_file.release(); 1023 } else { 1024 return nullptr; 1025 } 1026} 1027 1028const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1029 int fd, const char* oat_location, 1030 std::vector<std::string>* error_msgs) { 1031 // Generate the output oat file for the dex file 1032 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1033 std::string error_msg; 1034 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1035 CHECK(!error_msg.empty()); 1036 error_msgs->push_back(error_msg); 1037 return nullptr; 1038 } 1039 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, 1040 !Runtime::Current()->IsCompiler(), 1041 &error_msg)); 1042 if (oat_file.get() == nullptr) { 1043 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1044 oat_location, error_msg.c_str()); 1045 error_msgs->push_back(compound_msg); 1046 return nullptr; 1047 } 1048 1049 return oat_file.release(); 1050} 1051 1052bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1053 const InstructionSet instruction_set) { 1054 Runtime* runtime = Runtime::Current(); 1055 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1056 if (image_space == nullptr) { 1057 return false; 1058 } 1059 uint32_t image_oat_checksum = 0; 1060 if (instruction_set == kRuntimeISA) { 1061 const ImageHeader& image_header = image_space->GetImageHeader(); 1062 image_oat_checksum = image_header.GetOatChecksum(); 1063 } else { 1064 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1065 image_space->GetImageLocation().c_str(), instruction_set)); 1066 image_oat_checksum = image_header->GetOatChecksum(); 1067 } 1068 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1069} 1070 1071bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1072 const InstructionSet instruction_set, 1073 std::string* error_msg) { 1074 Runtime* runtime = Runtime::Current(); 1075 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1076 if (image_space == nullptr) { 1077 *error_msg = "No image space for verification against"; 1078 return false; 1079 } 1080 1081 // If the requested instruction set is the same as the current runtime, 1082 // we can use the checksums directly. If it isn't, we'll have to read the 1083 // image header from the image for the right instruction set. 1084 uint32_t image_oat_checksum = 0; 1085 uintptr_t image_oat_data_begin = 0; 1086 int32_t image_patch_delta = 0; 1087 if (instruction_set == runtime->GetInstructionSet()) { 1088 const ImageHeader& image_header = image_space->GetImageHeader(); 1089 image_oat_checksum = image_header.GetOatChecksum(); 1090 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1091 image_patch_delta = image_header.GetPatchDelta(); 1092 } else { 1093 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1094 image_space->GetImageLocation().c_str(), instruction_set)); 1095 image_oat_checksum = image_header->GetOatChecksum(); 1096 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1097 image_patch_delta = image_header->GetPatchDelta(); 1098 } 1099 const OatHeader& oat_header = oat_file->GetOatHeader(); 1100 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1101 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1102 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1103 if (!ret) { 1104 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1105 oat_file->GetLocation().c_str(), 1106 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1107 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1108 oat_file->GetOatHeader().GetImagePatchDelta(), 1109 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1110 } 1111 return ret; 1112} 1113 1114bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1115 const char* dex_location, 1116 uint32_t dex_location_checksum, 1117 const InstructionSet instruction_set, 1118 std::string* error_msg) { 1119 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1120 return false; 1121 } 1122 1123 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1124 &dex_location_checksum); 1125 if (oat_dex_file == nullptr) { 1126 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1127 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1128 for (const OatFile::OatDexFile* oat_dex_file : oat_file->GetOatDexFiles()) { 1129 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s' with checksum 0x%x", 1130 oat_file->GetLocation().c_str(), 1131 oat_dex_file->GetDexFileLocation().c_str(), 1132 oat_dex_file->GetDexFileLocationChecksum()); 1133 } 1134 return false; 1135 } 1136 1137 if (dex_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) { 1138 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1139 oat_file->GetLocation().c_str(), 1140 oat_dex_file->GetDexFileLocationChecksum(), 1141 dex_location, dex_location_checksum); 1142 return false; 1143 } 1144 return true; 1145} 1146 1147bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1148 const char* dex_location, 1149 const uint32_t* dex_location_checksum, 1150 std::string* error_msg) { 1151 CHECK(oat_file != nullptr); 1152 CHECK(dex_location != nullptr); 1153 std::unique_ptr<const DexFile> dex_file; 1154 if (dex_location_checksum == nullptr) { 1155 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1156 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1157 // directory. 1158 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, nullptr); 1159 if (oat_dex_file == nullptr) { 1160 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1161 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1162 error_msg->c_str()); 1163 return false; 1164 } 1165 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1166 } else { 1167 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, *dex_location_checksum, 1168 kRuntimeISA, error_msg); 1169 if (!verified) { 1170 return false; 1171 } 1172 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1173 dex_location_checksum)->OpenDexFile(error_msg)); 1174 } 1175 return dex_file.get() != nullptr; 1176} 1177 1178const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1179 const char* dex_location, 1180 const uint32_t* dex_location_checksum, 1181 InstructionSet isa, 1182 std::vector<std::string>* error_msgs, 1183 bool* obsolete_file_cleanup_failed) { 1184 *obsolete_file_cleanup_failed = false; 1185 bool already_opened = false; 1186 std::string dex_location_str(dex_location); 1187 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1188 &already_opened, 1189 obsolete_file_cleanup_failed, 1190 error_msgs)); 1191 std::string error_msg; 1192 if (oat_file.get() == nullptr) { 1193 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1194 dex_location)); 1195 return nullptr; 1196 } else if (oat_file->IsExecutable() && 1197 !VerifyOatWithDexFile(oat_file.get(), dex_location, 1198 dex_location_checksum, &error_msg)) { 1199 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1200 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1201 error_msg.c_str())); 1202 return nullptr; 1203 } else if (!oat_file->IsExecutable() && 1204 Runtime::Current()->GetHeap()->HasImageSpace() && 1205 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1206 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1207 "dex location '%s'. Image checksum incorrect.", 1208 oat_file->GetLocation().c_str(), dex_location)); 1209 return nullptr; 1210 } else { 1211 return oat_file.release(); 1212 } 1213} 1214 1215const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1216 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1217 for (size_t i = 0; i < oat_files_.size(); i++) { 1218 const OatFile* oat_file = oat_files_[i]; 1219 DCHECK(oat_file != nullptr); 1220 if (oat_file->GetLocation() == oat_location) { 1221 return oat_file; 1222 } 1223 } 1224 return nullptr; 1225} 1226 1227const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1228 InstructionSet isa, 1229 bool *already_opened, 1230 bool *obsolete_file_cleanup_failed, 1231 std::vector<std::string>* error_msgs) { 1232 // Find out if we've already opened the file 1233 const OatFile* ret = nullptr; 1234 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1235 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1236 if (ret != nullptr) { 1237 *already_opened = true; 1238 return ret; 1239 } 1240 1241 std::string dalvik_cache; 1242 bool have_android_data = false; 1243 bool have_dalvik_cache = false; 1244 bool is_global_cache = false; 1245 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1246 &have_android_data, &have_dalvik_cache, &is_global_cache); 1247 std::string cache_filename; 1248 if (have_dalvik_cache) { 1249 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1250 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1251 if (ret != nullptr) { 1252 *already_opened = true; 1253 return ret; 1254 } 1255 } else { 1256 // If we need to relocate we should just place odex back where it started. 1257 cache_filename = odex_filename; 1258 } 1259 1260 ret = nullptr; 1261 1262 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1263 // 1264 // Now we do the following: 1265 // 1) Try and open the odex version 1266 // 2) If present, checksum-verified & relocated correctly return it 1267 // 3) Close the odex version to free up its address space. 1268 // 4) Try and open the cache version 1269 // 5) If present, checksum-verified & relocated correctly return it 1270 // 6) Close the cache version to free up its address space. 1271 // 7) If we should relocate: 1272 // a) If we have opened and checksum-verified the odex version relocate it to 1273 // 'cache_filename' and return it 1274 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1275 // it. This should not happen often (I think only the run-test's will hit this case). 1276 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1277 // this point. 1278 // 9) Return nullptr 1279 1280 *already_opened = false; 1281 const Runtime* runtime = Runtime::Current(); 1282 CHECK(runtime != nullptr); 1283 bool executable = !runtime->IsCompiler(); 1284 1285 std::string odex_error_msg; 1286 bool should_patch_system = false; 1287 bool odex_checksum_verified = false; 1288 bool have_system_odex = false; 1289 { 1290 // There is a high probability that both these oat files map similar/the same address 1291 // spaces so we must scope them like this so they each gets its turn. 1292 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, nullptr, 1293 executable, &odex_error_msg)); 1294 if (odex_oat_file.get() != nullptr && CheckOatFile(runtime, odex_oat_file.get(), isa, 1295 &odex_checksum_verified, 1296 &odex_error_msg)) { 1297 error_msgs->push_back(odex_error_msg); 1298 return odex_oat_file.release(); 1299 } else { 1300 if (odex_checksum_verified) { 1301 // We can just relocate 1302 should_patch_system = true; 1303 odex_error_msg = "Image Patches are incorrect"; 1304 } 1305 if (odex_oat_file.get() != nullptr) { 1306 have_system_odex = true; 1307 } 1308 } 1309 } 1310 1311 std::string cache_error_msg; 1312 bool should_patch_cache = false; 1313 bool cache_checksum_verified = false; 1314 if (have_dalvik_cache) { 1315 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, nullptr, 1316 executable, &cache_error_msg)); 1317 if (cache_oat_file.get() != nullptr && CheckOatFile(runtime, cache_oat_file.get(), isa, 1318 &cache_checksum_verified, 1319 &cache_error_msg)) { 1320 error_msgs->push_back(cache_error_msg); 1321 return cache_oat_file.release(); 1322 } else if (cache_checksum_verified) { 1323 // We can just relocate 1324 should_patch_cache = true; 1325 cache_error_msg = "Image Patches are incorrect"; 1326 } 1327 } else if (have_android_data) { 1328 // dalvik_cache does not exist but android data does. This means we should be able to create 1329 // it, so we should try. 1330 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1331 } 1332 1333 ret = nullptr; 1334 std::string error_msg; 1335 if (runtime->CanRelocate()) { 1336 // Run relocation 1337 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1338 if (space != nullptr) { 1339 const std::string& image_location = space->GetImageLocation(); 1340 if (odex_checksum_verified && should_patch_system) { 1341 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1342 } else if (cache_checksum_verified && should_patch_cache) { 1343 CHECK(have_dalvik_cache); 1344 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1345 } 1346 } else if (have_system_odex) { 1347 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1348 } 1349 } 1350 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1351 // implicitly: were able to fine where the cached version is but we were unable to use it, 1352 // either as a destination for relocation or to open a file. We should delete it if it is 1353 // there. 1354 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1355 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1356 "searching for dex file %s: %s", 1357 cache_filename.c_str(), dex_location.c_str(), 1358 strerror(errno)); 1359 error_msgs->push_back(rm_error_msg); 1360 VLOG(class_linker) << rm_error_msg; 1361 // Let the caller know that we couldn't remove the obsolete file. 1362 // This is a good indication that further writes may fail as well. 1363 *obsolete_file_cleanup_failed = true; 1364 } 1365 } 1366 if (ret == nullptr) { 1367 VLOG(class_linker) << error_msg; 1368 error_msgs->push_back(error_msg); 1369 std::string relocation_msg; 1370 if (runtime->CanRelocate()) { 1371 relocation_msg = StringPrintf(" and relocation failed"); 1372 } 1373 if (have_dalvik_cache && cache_checksum_verified) { 1374 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1375 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1376 cache_filename.c_str(), cache_error_msg.c_str(), 1377 relocation_msg.c_str()); 1378 } else { 1379 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1380 "dalvik_cache availible)%s.", odex_filename.c_str(), 1381 odex_error_msg.c_str(), relocation_msg.c_str()); 1382 } 1383 VLOG(class_linker) << error_msg; 1384 error_msgs->push_back(error_msg); 1385 } 1386 return ret; 1387} 1388 1389const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1390 InstructionSet isa, 1391 std::string* error_msg) { 1392 // We open it non-executable 1393 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, nullptr, false, error_msg)); 1394 if (output.get() == nullptr) { 1395 return nullptr; 1396 } 1397 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1398 VerifyOatImageChecksum(output.get(), isa)) { 1399 return output.release(); 1400 } else { 1401 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1402 oat_path.c_str()); 1403 return nullptr; 1404 } 1405} 1406 1407const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1408 const std::string& output_oat, 1409 const std::string& image_location, 1410 InstructionSet isa, 1411 std::string* error_msg) { 1412 Runtime* runtime = Runtime::Current(); 1413 DCHECK(runtime != nullptr); 1414 if (!runtime->GetHeap()->HasImageSpace()) { 1415 // We don't have an image space so there is no point in trying to patchoat. 1416 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1417 << "running without an image. Attempting to use oat file for interpretation."; 1418 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1419 } 1420 if (!runtime->IsDex2OatEnabled()) { 1421 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1422 // input_oat but make sure we only do interpretation on it's dex files. 1423 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1424 << "disabled. Attempting to use oat file for interpretation"; 1425 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1426 } 1427 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1428 std::string patchoat(runtime->GetPatchoatExecutable()); 1429 1430 std::string isa_arg("--instruction-set="); 1431 isa_arg += GetInstructionSetString(isa); 1432 std::string input_oat_filename_arg("--input-oat-file="); 1433 input_oat_filename_arg += input_oat; 1434 std::string output_oat_filename_arg("--output-oat-file="); 1435 output_oat_filename_arg += output_oat; 1436 std::string patched_image_arg("--patched-image-location="); 1437 patched_image_arg += image_location; 1438 1439 std::vector<std::string> argv; 1440 argv.push_back(patchoat); 1441 argv.push_back(isa_arg); 1442 argv.push_back(input_oat_filename_arg); 1443 argv.push_back(output_oat_filename_arg); 1444 argv.push_back(patched_image_arg); 1445 1446 std::string command_line(Join(argv, ' ')); 1447 LOG(INFO) << "Relocate Oat File: " << command_line; 1448 bool success = Exec(argv, error_msg); 1449 if (success) { 1450 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, nullptr, 1451 !runtime->IsCompiler(), error_msg)); 1452 bool checksum_verified = false; 1453 if (output.get() != nullptr && CheckOatFile(runtime, output.get(), isa, &checksum_verified, 1454 error_msg)) { 1455 return output.release(); 1456 } else if (output.get() != nullptr) { 1457 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1458 "but output file '%s' failed verifcation: %s", 1459 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1460 } else { 1461 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1462 "but was unable to open output file '%s': %s", 1463 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1464 } 1465 } else if (!runtime->IsCompiler()) { 1466 // patchoat failed which means we probably don't have enough room to place the output oat file, 1467 // instead of failing we should just run the interpreter from the dex files in the input oat. 1468 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1469 << "for interpretation. patchoat failure was: " << *error_msg; 1470 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1471 } else { 1472 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1473 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1474 error_msg->c_str()); 1475 } 1476 return nullptr; 1477} 1478 1479bool ClassLinker::CheckOatFile(const Runtime* runtime, const OatFile* oat_file, InstructionSet isa, 1480 bool* checksum_verified, 1481 std::string* error_msg) { 1482 std::string compound_msg("Oat file failed to verify: "); 1483 uint32_t real_image_checksum; 1484 void* real_image_oat_offset; 1485 int32_t real_patch_delta; 1486 const gc::space::ImageSpace* image_space = Runtime::Current()->GetHeap()->GetImageSpace(); 1487 if (image_space == nullptr) { 1488 *error_msg = "No image space present"; 1489 return false; 1490 } 1491 if (isa == Runtime::Current()->GetInstructionSet()) { 1492 const ImageHeader& image_header = image_space->GetImageHeader(); 1493 real_image_checksum = image_header.GetOatChecksum(); 1494 real_image_oat_offset = image_header.GetOatDataBegin(); 1495 real_patch_delta = image_header.GetPatchDelta(); 1496 } else { 1497 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1498 image_space->GetImageLocation().c_str(), isa)); 1499 real_image_checksum = image_header->GetOatChecksum(); 1500 real_image_oat_offset = image_header->GetOatDataBegin(); 1501 real_patch_delta = image_header->GetPatchDelta(); 1502 } 1503 1504 const OatHeader& oat_header = oat_file->GetOatHeader(); 1505 1506 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1507 *checksum_verified = oat_image_checksum == real_image_checksum; 1508 if (!*checksum_verified) { 1509 compound_msg += StringPrintf(" Oat Image Checksum Incorrect (expected 0x%x, recieved 0x%x)", 1510 real_image_checksum, oat_image_checksum); 1511 } 1512 1513 bool offset_verified; 1514 bool patch_delta_verified; 1515 1516 if (!oat_file->IsPic()) { 1517 void* oat_image_oat_offset = 1518 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1519 offset_verified = oat_image_oat_offset == real_image_oat_offset; 1520 if (!offset_verified) { 1521 compound_msg += StringPrintf(" Oat Image oat offset incorrect (expected 0x%p, recieved 0x%p)", 1522 real_image_oat_offset, oat_image_oat_offset); 1523 } 1524 1525 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1526 patch_delta_verified = oat_patch_delta == real_patch_delta; 1527 if (!patch_delta_verified) { 1528 compound_msg += StringPrintf(" Oat image patch delta incorrect (expected 0x%x, recieved 0x%x)", 1529 real_patch_delta, oat_patch_delta); 1530 } 1531 } else { 1532 // If an oat file is PIC, we ignore offset and patching delta. 1533 offset_verified = true; 1534 patch_delta_verified = true; 1535 } 1536 1537 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1538 if (ret) { 1539 *error_msg = compound_msg; 1540 } 1541 return ret; 1542} 1543 1544const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1545 std::string* error_msg) { 1546 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1547 if (oat_file != nullptr) { 1548 return oat_file; 1549 } 1550 1551 return OatFile::Open(oat_location, oat_location, nullptr, !Runtime::Current()->IsCompiler(), 1552 error_msg); 1553} 1554 1555static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1556 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1557 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1558 1559 DCHECK(obj != nullptr); 1560 DCHECK(class_linker != nullptr); 1561 1562 if (obj->IsArtMethod()) { 1563 mirror::ArtMethod* method = obj->AsArtMethod(); 1564 if (!method->IsNative()) { 1565 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1566 if (method != Runtime::Current()->GetResolutionMethod()) { 1567 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1568#if defined(ART_USE_PORTABLE_COMPILER) 1569 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1570#endif 1571 } 1572 } 1573 } 1574} 1575 1576void ClassLinker::InitFromImage() { 1577 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1578 CHECK(!init_done_); 1579 1580 Thread* self = Thread::Current(); 1581 gc::Heap* heap = Runtime::Current()->GetHeap(); 1582 gc::space::ImageSpace* space = heap->GetImageSpace(); 1583 dex_cache_image_class_lookup_required_ = true; 1584 CHECK(space != nullptr); 1585 OatFile& oat_file = GetImageOatFile(space); 1586 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1587 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1588 const char* image_file_location = oat_file.GetOatHeader(). 1589 GetStoreValueByKey(OatHeader::kImageLocationKey); 1590 CHECK(image_file_location == nullptr || *image_file_location == 0); 1591 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1592 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1593 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1594 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1595 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1596 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1597 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1598 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1599 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1600 1601 StackHandleScope<1> hs(self); 1602 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1603 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1604 AsObjectArray<mirror::Class>())); 1605 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1606 1607 // Special case of setting up the String class early so that we can test arbitrary objects 1608 // as being Strings or not 1609 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1610 1611 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1612 static_cast<uint32_t>(dex_caches->GetLength())); 1613 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1614 StackHandleScope<1> hs(self); 1615 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1616 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1617 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1618 nullptr); 1619 CHECK(oat_dex_file != nullptr) << oat_file.GetLocation() << " " << dex_file_location; 1620 std::string error_msg; 1621 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1622 if (dex_file == nullptr) { 1623 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1624 << " from within oat file " << oat_file.GetLocation() 1625 << " error '" << error_msg << "'"; 1626 } 1627 1628 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1629 1630 AppendToBootClassPath(*dex_file, dex_cache); 1631 } 1632 1633 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1634 // bitmap walk. 1635 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1636 1637 // Set entry point to interpreter if in InterpretOnly mode. 1638 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1639 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1640 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1641 } 1642 1643 // reinit class_roots_ 1644 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1645 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1646 1647 // reinit array_iftable_ from any array class instance, they should be == 1648 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1649 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1650 // String class root was set above 1651 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1652 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1653 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1654 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1655 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1656 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1657 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1658 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1659 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1660 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1661 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1662 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1663 1664 FinishInit(self); 1665 1666 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1667} 1668 1669void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1670 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1671 if ((flags & kVisitRootFlagAllRoots) != 0) { 1672 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1673 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1674 } 1675 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1676 for (auto& pair : new_class_roots_) { 1677 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1678 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1679 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1680 if (UNLIKELY(new_ref != old_ref)) { 1681 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1682 // corresponding object. This is slow, but luckily for us, this may only happen with a 1683 // concurrent moving GC. 1684 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1685 it != end && it->first == pair.first; ++it) { 1686 // If the class stored matches the old class, update it to the new value. 1687 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1688 it->second = GcRoot<mirror::Class>(new_ref); 1689 } 1690 } 1691 } 1692 } 1693 } 1694 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1695 new_class_roots_.clear(); 1696 } 1697 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1698 log_new_class_table_roots_ = true; 1699 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1700 log_new_class_table_roots_ = false; 1701 } 1702 // We deliberately ignore the class roots in the image since we 1703 // handle image roots by using the MS/CMS rescanning of dirty cards. 1704} 1705 1706// Keep in sync with InitCallback. Anything we visit, we need to 1707// reinit references to when reinitializing a ClassLinker from a 1708// mapped image. 1709void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1710 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1711 Thread* self = Thread::Current(); 1712 { 1713 ReaderMutexLock mu(self, dex_lock_); 1714 if ((flags & kVisitRootFlagAllRoots) != 0) { 1715 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1716 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1717 } 1718 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1719 for (size_t index : new_dex_cache_roots_) { 1720 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1721 } 1722 } 1723 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1724 new_dex_cache_roots_.clear(); 1725 } 1726 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1727 log_new_dex_caches_roots_ = true; 1728 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1729 log_new_dex_caches_roots_ = false; 1730 } 1731 } 1732 VisitClassRoots(callback, arg, flags); 1733 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1734 DCHECK(!array_iftable_.IsNull()); 1735 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1736 if (!find_array_class_cache_[i].IsNull()) { 1737 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1738 } 1739 } 1740} 1741 1742void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1743 if (dex_cache_image_class_lookup_required_) { 1744 MoveImageClassesToClassTable(); 1745 } 1746 // TODO: why isn't this a ReaderMutexLock? 1747 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1748 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1749 mirror::Class* c = it.second.Read(); 1750 if (!visitor(c, arg)) { 1751 return; 1752 } 1753 } 1754} 1755 1756static bool GetClassesVisitorSet(mirror::Class* c, void* arg) { 1757 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1758 classes->insert(c); 1759 return true; 1760} 1761 1762struct GetClassesVisitorArrayArg { 1763 Handle<mirror::ObjectArray<mirror::Class>>* classes; 1764 int32_t index; 1765 bool success; 1766}; 1767 1768static bool GetClassesVisitorArray(mirror::Class* c, void* varg) 1769 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1770 GetClassesVisitorArrayArg* arg = reinterpret_cast<GetClassesVisitorArrayArg*>(varg); 1771 if (arg->index < (*arg->classes)->GetLength()) { 1772 (*arg->classes)->Set(arg->index, c); 1773 arg->index++; 1774 return true; 1775 } else { 1776 arg->success = false; 1777 return false; 1778 } 1779} 1780 1781void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1782 // TODO: it may be possible to avoid secondary storage if we iterate over dex caches. The problem 1783 // is avoiding duplicates. 1784 if (!kMovingClasses) { 1785 std::set<mirror::Class*> classes; 1786 VisitClasses(GetClassesVisitorSet, &classes); 1787 for (mirror::Class* klass : classes) { 1788 if (!visitor(klass, arg)) { 1789 return; 1790 } 1791 } 1792 } else { 1793 Thread* self = Thread::Current(); 1794 StackHandleScope<1> hs(self); 1795 Handle<mirror::ObjectArray<mirror::Class>> classes = 1796 hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1797 GetClassesVisitorArrayArg local_arg; 1798 local_arg.classes = &classes; 1799 local_arg.success = false; 1800 // We size the array assuming classes won't be added to the class table during the visit. 1801 // If this assumption fails we iterate again. 1802 while (!local_arg.success) { 1803 size_t class_table_size; 1804 { 1805 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1806 class_table_size = class_table_.size(); 1807 } 1808 mirror::Class* class_type = mirror::Class::GetJavaLangClass(); 1809 mirror::Class* array_of_class = FindArrayClass(self, &class_type); 1810 classes.Assign( 1811 mirror::ObjectArray<mirror::Class>::Alloc(self, array_of_class, class_table_size)); 1812 CHECK(classes.Get() != nullptr); // OOME. 1813 local_arg.index = 0; 1814 local_arg.success = true; 1815 VisitClasses(GetClassesVisitorArray, &local_arg); 1816 } 1817 for (int32_t i = 0; i < classes->GetLength(); ++i) { 1818 // If the class table shrank during creation of the clases array we expect null elements. If 1819 // the class table grew then the loop repeats. If classes are created after the loop has 1820 // finished then we don't visit. 1821 mirror::Class* klass = classes->Get(i); 1822 if (klass != nullptr && !visitor(klass, arg)) { 1823 return; 1824 } 1825 } 1826 } 1827} 1828 1829ClassLinker::~ClassLinker() { 1830 mirror::Class::ResetClass(); 1831 mirror::String::ResetClass(); 1832 mirror::Reference::ResetClass(); 1833 mirror::ArtField::ResetClass(); 1834 mirror::ArtMethod::ResetClass(); 1835 mirror::BooleanArray::ResetArrayClass(); 1836 mirror::ByteArray::ResetArrayClass(); 1837 mirror::CharArray::ResetArrayClass(); 1838 mirror::DoubleArray::ResetArrayClass(); 1839 mirror::FloatArray::ResetArrayClass(); 1840 mirror::IntArray::ResetArrayClass(); 1841 mirror::LongArray::ResetArrayClass(); 1842 mirror::ShortArray::ResetArrayClass(); 1843 mirror::Throwable::ResetClass(); 1844 mirror::StackTraceElement::ResetClass(); 1845 STLDeleteElements(&boot_class_path_); 1846 STLDeleteElements(&oat_files_); 1847} 1848 1849mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1850 gc::Heap* heap = Runtime::Current()->GetHeap(); 1851 StackHandleScope<16> hs(self); 1852 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1853 Handle<mirror::DexCache> dex_cache( 1854 hs.NewHandle(down_cast<mirror::DexCache*>( 1855 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1856 VoidFunctor())))); 1857 if (dex_cache.Get() == nullptr) { 1858 return nullptr; 1859 } 1860 Handle<mirror::String> 1861 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1862 if (location.Get() == nullptr) { 1863 return nullptr; 1864 } 1865 Handle<mirror::ObjectArray<mirror::String>> 1866 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1867 if (strings.Get() == nullptr) { 1868 return nullptr; 1869 } 1870 Handle<mirror::ObjectArray<mirror::Class>> 1871 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1872 if (types.Get() == nullptr) { 1873 return nullptr; 1874 } 1875 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1876 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1877 if (methods.Get() == nullptr) { 1878 return nullptr; 1879 } 1880 Handle<mirror::ObjectArray<mirror::ArtField>> 1881 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1882 if (fields.Get() == nullptr) { 1883 return nullptr; 1884 } 1885 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1886 fields.Get()); 1887 return dex_cache.Get(); 1888} 1889 1890mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1891 uint32_t class_size) { 1892 DCHECK_GE(class_size, sizeof(mirror::Class)); 1893 gc::Heap* heap = Runtime::Current()->GetHeap(); 1894 mirror::Class::InitializeClassVisitor visitor(class_size); 1895 mirror::Object* k = kMovingClasses ? 1896 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1897 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1898 if (UNLIKELY(k == nullptr)) { 1899 CHECK(self->IsExceptionPending()); // OOME. 1900 return nullptr; 1901 } 1902 return k->AsClass(); 1903} 1904 1905mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1906 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1907} 1908 1909mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1910 return down_cast<mirror::ArtField*>( 1911 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1912} 1913 1914mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1915 return down_cast<mirror::ArtMethod*>( 1916 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1917} 1918 1919mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1920 Thread* self, size_t length) { 1921 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1922 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1923} 1924 1925mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1926 mirror::Class* klass) { 1927 DCHECK(klass != nullptr); 1928 1929 // For temporary classes we must wait for them to be retired. 1930 if (init_done_ && klass->IsTemp()) { 1931 CHECK(!klass->IsResolved()); 1932 if (klass->IsErroneous()) { 1933 ThrowEarlierClassFailure(klass); 1934 return nullptr; 1935 } 1936 StackHandleScope<1> hs(self); 1937 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1938 ObjectLock<mirror::Class> lock(self, h_class); 1939 // Loop and wait for the resolving thread to retire this class. 1940 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1941 lock.WaitIgnoringInterrupts(); 1942 } 1943 if (h_class->IsErroneous()) { 1944 ThrowEarlierClassFailure(h_class.Get()); 1945 return nullptr; 1946 } 1947 CHECK(h_class->IsRetired()); 1948 // Get the updated class from class table. 1949 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1950 } 1951 1952 // Wait for the class if it has not already been linked. 1953 if (!klass->IsResolved() && !klass->IsErroneous()) { 1954 StackHandleScope<1> hs(self); 1955 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1956 ObjectLock<mirror::Class> lock(self, h_class); 1957 // Check for circular dependencies between classes. 1958 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1959 ThrowClassCircularityError(h_class.Get()); 1960 h_class->SetStatus(mirror::Class::kStatusError, self); 1961 return nullptr; 1962 } 1963 // Wait for the pending initialization to complete. 1964 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1965 lock.WaitIgnoringInterrupts(); 1966 } 1967 } 1968 1969 if (klass->IsErroneous()) { 1970 ThrowEarlierClassFailure(klass); 1971 return nullptr; 1972 } 1973 // Return the loaded class. No exceptions should be pending. 1974 CHECK(klass->IsResolved()) << PrettyClass(klass); 1975 self->AssertNoPendingException(); 1976 return klass; 1977} 1978 1979typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry; 1980 1981// Search a collection of DexFiles for a descriptor 1982ClassPathEntry FindInClassPath(const char* descriptor, 1983 const std::vector<const DexFile*>& class_path) { 1984 for (size_t i = 0; i != class_path.size(); ++i) { 1985 const DexFile* dex_file = class_path[i]; 1986 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 1987 if (dex_class_def != nullptr) { 1988 return ClassPathEntry(dex_file, dex_class_def); 1989 } 1990 } 1991 // TODO: remove reinterpret_cast when issue with -std=gnu++0x host issue resolved 1992 return ClassPathEntry(static_cast<const DexFile*>(nullptr), 1993 static_cast<const DexFile::ClassDef*>(nullptr)); 1994} 1995 1996mirror::Class* ClassLinker::FindClassInPathClassLoader(ScopedObjectAccessAlreadyRunnable& soa, 1997 Thread* self, const char* descriptor, 1998 Handle<mirror::ClassLoader> class_loader) { 1999 if (class_loader->GetClass() != 2000 soa.Decode<mirror::Class*>(WellKnownClasses::dalvik_system_PathClassLoader) || 2001 class_loader->GetParent()->GetClass() != 2002 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_BootClassLoader)) { 2003 return nullptr; 2004 } 2005 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2006 // Check if this would be found in the parent boot class loader. 2007 if (pair.second != nullptr) { 2008 mirror::Class* klass = LookupClass(descriptor, nullptr); 2009 if (klass != nullptr) { 2010 return EnsureResolved(self, descriptor, klass); 2011 } 2012 klass = DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, 2013 *pair.second); 2014 if (klass != nullptr) { 2015 return klass; 2016 } 2017 CHECK(self->IsExceptionPending()) << descriptor; 2018 self->ClearException(); 2019 } else { 2020 // RegisterDexFile may allocate dex caches (and cause thread suspension). 2021 StackHandleScope<3> hs(self); 2022 // The class loader is a PathClassLoader which inherits from BaseDexClassLoader. 2023 // We need to get the DexPathList and loop through it. 2024 Handle<mirror::ArtField> cookie_field = 2025 hs.NewHandle(soa.DecodeField(WellKnownClasses::dalvik_system_DexFile_cookie)); 2026 Handle<mirror::ArtField> dex_file_field = 2027 hs.NewHandle( 2028 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList$Element_dexFile)); 2029 mirror::Object* dex_path_list = 2030 soa.DecodeField(WellKnownClasses::dalvik_system_PathClassLoader_pathList)-> 2031 GetObject(class_loader.Get()); 2032 if (dex_path_list != nullptr && dex_file_field.Get() != nullptr && 2033 cookie_field.Get() != nullptr) { 2034 // DexPathList has an array dexElements of Elements[] which each contain a dex file. 2035 mirror::Object* dex_elements_obj = 2036 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList_dexElements)-> 2037 GetObject(dex_path_list); 2038 // Loop through each dalvik.system.DexPathList$Element's dalvik.system.DexFile and look 2039 // at the mCookie which is a DexFile vector. 2040 if (dex_elements_obj != nullptr) { 2041 Handle<mirror::ObjectArray<mirror::Object>> dex_elements = 2042 hs.NewHandle(dex_elements_obj->AsObjectArray<mirror::Object>()); 2043 for (int32_t i = 0; i < dex_elements->GetLength(); ++i) { 2044 mirror::Object* element = dex_elements->GetWithoutChecks(i); 2045 if (element == nullptr) { 2046 // Should never happen, fall back to java code to throw a NPE. 2047 break; 2048 } 2049 mirror::Object* dex_file = dex_file_field->GetObject(element); 2050 if (dex_file != nullptr) { 2051 const uint64_t cookie = cookie_field->GetLong(dex_file); 2052 auto* dex_files = 2053 reinterpret_cast<std::vector<const DexFile*>*>(static_cast<uintptr_t>(cookie)); 2054 if (dex_files == nullptr) { 2055 // This should never happen so log a warning. 2056 LOG(WARNING) << "Null DexFile::mCookie for " << descriptor; 2057 break; 2058 } 2059 for (const DexFile* dex_file : *dex_files) { 2060 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 2061 if (dex_class_def != nullptr) { 2062 RegisterDexFile(*dex_file); 2063 mirror::Class* klass = 2064 DefineClass(descriptor, class_loader, *dex_file, *dex_class_def); 2065 if (klass == nullptr) { 2066 CHECK(self->IsExceptionPending()) << descriptor; 2067 self->ClearException(); 2068 return nullptr; 2069 } 2070 return klass; 2071 } 2072 } 2073 } 2074 } 2075 } 2076 } 2077 } 2078 return nullptr; 2079} 2080 2081mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 2082 Handle<mirror::ClassLoader> class_loader) { 2083 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 2084 DCHECK(self != nullptr); 2085 self->AssertNoPendingException(); 2086 if (descriptor[1] == '\0') { 2087 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 2088 // for primitive classes that aren't backed by dex files. 2089 return FindPrimitiveClass(descriptor[0]); 2090 } 2091 // Find the class in the loaded classes table. 2092 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 2093 if (klass != nullptr) { 2094 return EnsureResolved(self, descriptor, klass); 2095 } 2096 // Class is not yet loaded. 2097 if (descriptor[0] == '[') { 2098 return CreateArrayClass(self, descriptor, class_loader); 2099 } else if (class_loader.Get() == nullptr) { 2100 // The boot class loader, search the boot class path. 2101 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2102 if (pair.second != nullptr) { 2103 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 2104 } else { 2105 // The boot class loader is searched ahead of the application class loader, failures are 2106 // expected and will be wrapped in a ClassNotFoundException. Use the pre-allocated error to 2107 // trigger the chaining with a proper stack trace. 2108 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2109 self->SetException(ThrowLocation(), pre_allocated); 2110 return nullptr; 2111 } 2112 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 2113 // First try with the bootstrap class loader. 2114 if (class_loader.Get() != nullptr) { 2115 klass = LookupClass(descriptor, nullptr); 2116 if (klass != nullptr) { 2117 return EnsureResolved(self, descriptor, klass); 2118 } 2119 } 2120 // If the lookup failed search the boot class path. We don't perform a recursive call to avoid 2121 // a NoClassDefFoundError being allocated. 2122 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2123 if (pair.second != nullptr) { 2124 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 2125 } 2126 // Next try the compile time class path. 2127 const std::vector<const DexFile*>* class_path; 2128 { 2129 ScopedObjectAccessUnchecked soa(self); 2130 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 2131 soa.AddLocalReference<jobject>(class_loader.Get())); 2132 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 2133 } 2134 pair = FindInClassPath(descriptor, *class_path); 2135 if (pair.second != nullptr) { 2136 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 2137 } 2138 } else { 2139 ScopedObjectAccessUnchecked soa(self); 2140 mirror::Class* klass = FindClassInPathClassLoader(soa, self, descriptor, class_loader); 2141 if (klass != nullptr) { 2142 return klass; 2143 } 2144 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 2145 soa.AddLocalReference<jobject>(class_loader.Get())); 2146 std::string class_name_string(DescriptorToDot(descriptor)); 2147 ScopedLocalRef<jobject> result(soa.Env(), nullptr); 2148 { 2149 ScopedThreadStateChange tsc(self, kNative); 2150 ScopedLocalRef<jobject> class_name_object(soa.Env(), 2151 soa.Env()->NewStringUTF(class_name_string.c_str())); 2152 if (class_name_object.get() == nullptr) { 2153 DCHECK(self->IsExceptionPending()); // OOME. 2154 return nullptr; 2155 } 2156 CHECK(class_loader_object.get() != nullptr); 2157 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 2158 WellKnownClasses::java_lang_ClassLoader_loadClass, 2159 class_name_object.get())); 2160 } 2161 if (self->IsExceptionPending()) { 2162 // If the ClassLoader threw, pass that exception up. 2163 return nullptr; 2164 } else if (result.get() == nullptr) { 2165 // broken loader - throw NPE to be compatible with Dalvik 2166 ThrowNullPointerException(nullptr, StringPrintf("ClassLoader.loadClass returned null for %s", 2167 class_name_string.c_str()).c_str()); 2168 return nullptr; 2169 } else { 2170 // success, return mirror::Class* 2171 return soa.Decode<mirror::Class*>(result.get()); 2172 } 2173 } 2174 2175 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 2176 return nullptr; 2177} 2178 2179mirror::Class* ClassLinker::DefineClass(const char* descriptor, 2180 Handle<mirror::ClassLoader> class_loader, 2181 const DexFile& dex_file, 2182 const DexFile::ClassDef& dex_class_def) { 2183 Thread* self = Thread::Current(); 2184 StackHandleScope<3> hs(self); 2185 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2186 bool should_allocate = false; 2187 2188 // Load the class from the dex file. 2189 if (UNLIKELY(!init_done_)) { 2190 // finish up init of hand crafted class_roots_ 2191 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2192 klass.Assign(GetClassRoot(kJavaLangObject)); 2193 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2194 klass.Assign(GetClassRoot(kJavaLangClass)); 2195 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2196 klass.Assign(GetClassRoot(kJavaLangString)); 2197 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2198 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2199 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2200 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2201 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2202 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2203 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2204 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2205 } else { 2206 should_allocate = true; 2207 } 2208 } else { 2209 should_allocate = true; 2210 } 2211 2212 if (should_allocate) { 2213 // Allocate a class with the status of not ready. 2214 // Interface object should get the right size here. Regular class will 2215 // figure out the right size later and be replaced with one of the right 2216 // size when the class becomes resolved. 2217 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2218 } 2219 if (UNLIKELY(klass.Get() == nullptr)) { 2220 CHECK(self->IsExceptionPending()); // Expect an OOME. 2221 return nullptr; 2222 } 2223 klass->SetDexCache(FindDexCache(dex_file)); 2224 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 2225 ObjectLock<mirror::Class> lock(self, klass); 2226 if (self->IsExceptionPending()) { 2227 // An exception occured during load, set status to erroneous while holding klass' lock in case 2228 // notification is necessary. 2229 if (!klass->IsErroneous()) { 2230 klass->SetStatus(mirror::Class::kStatusError, self); 2231 } 2232 return nullptr; 2233 } 2234 klass->SetClinitThreadId(self->GetTid()); 2235 2236 // Add the newly loaded class to the loaded classes table. 2237 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 2238 if (existing != nullptr) { 2239 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2240 // this thread to block. 2241 return EnsureResolved(self, descriptor, existing); 2242 } 2243 2244 // Finish loading (if necessary) by finding parents 2245 CHECK(!klass->IsLoaded()); 2246 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2247 // Loading failed. 2248 if (!klass->IsErroneous()) { 2249 klass->SetStatus(mirror::Class::kStatusError, self); 2250 } 2251 return nullptr; 2252 } 2253 CHECK(klass->IsLoaded()); 2254 // Link the class (if necessary) 2255 CHECK(!klass->IsResolved()); 2256 // TODO: Use fast jobjects? 2257 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2258 2259 mirror::Class* new_class = nullptr; 2260 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2261 // Linking failed. 2262 if (!klass->IsErroneous()) { 2263 klass->SetStatus(mirror::Class::kStatusError, self); 2264 } 2265 return nullptr; 2266 } 2267 self->AssertNoPendingException(); 2268 CHECK(new_class != nullptr) << descriptor; 2269 CHECK(new_class->IsResolved()) << descriptor; 2270 2271 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2272 2273 /* 2274 * We send CLASS_PREPARE events to the debugger from here. The 2275 * definition of "preparation" is creating the static fields for a 2276 * class and initializing them to the standard default values, but not 2277 * executing any code (that comes later, during "initialization"). 2278 * 2279 * We did the static preparation in LinkClass. 2280 * 2281 * The class has been prepared and resolved but possibly not yet verified 2282 * at this point. 2283 */ 2284 Dbg::PostClassPrepare(new_class_h.Get()); 2285 2286 return new_class_h.Get(); 2287} 2288 2289uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2290 const DexFile::ClassDef& dex_class_def) { 2291 const byte* class_data = dex_file.GetClassData(dex_class_def); 2292 size_t num_ref = 0; 2293 size_t num_32 = 0; 2294 size_t num_64 = 0; 2295 if (class_data != nullptr) { 2296 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2297 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2298 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2299 char c = descriptor[0]; 2300 if (c == 'L' || c == '[') { 2301 num_ref++; 2302 } else if (c == 'J' || c == 'D') { 2303 num_64++; 2304 } else { 2305 num_32++; 2306 } 2307 } 2308 } 2309 return mirror::Class::ComputeClassSize(false, 0, num_32, num_64, num_ref); 2310} 2311 2312bool ClassLinker::FindOatClass(const DexFile& dex_file, 2313 uint16_t class_def_idx, 2314 OatFile::OatClass* oat_class) { 2315 DCHECK(oat_class != nullptr); 2316 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2317 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 2318 if (oat_dex_file == nullptr) { 2319 return false; 2320 } 2321 *oat_class = oat_dex_file->GetOatClass(class_def_idx); 2322 return true; 2323} 2324 2325static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2326 uint32_t method_idx) { 2327 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2328 const byte* class_data = dex_file.GetClassData(class_def); 2329 CHECK(class_data != nullptr); 2330 ClassDataItemIterator it(dex_file, class_data); 2331 // Skip fields 2332 while (it.HasNextStaticField()) { 2333 it.Next(); 2334 } 2335 while (it.HasNextInstanceField()) { 2336 it.Next(); 2337 } 2338 // Process methods 2339 size_t class_def_method_index = 0; 2340 while (it.HasNextDirectMethod()) { 2341 if (it.GetMemberIndex() == method_idx) { 2342 return class_def_method_index; 2343 } 2344 class_def_method_index++; 2345 it.Next(); 2346 } 2347 while (it.HasNextVirtualMethod()) { 2348 if (it.GetMemberIndex() == method_idx) { 2349 return class_def_method_index; 2350 } 2351 class_def_method_index++; 2352 it.Next(); 2353 } 2354 DCHECK(!it.HasNext()); 2355 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2356 return 0; 2357} 2358 2359bool ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, OatFile::OatMethod* oat_method) { 2360 DCHECK(oat_method != nullptr); 2361 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2362 // method for direct methods (or virtual methods made direct). 2363 mirror::Class* declaring_class = method->GetDeclaringClass(); 2364 size_t oat_method_index; 2365 if (method->IsStatic() || method->IsDirect()) { 2366 // Simple case where the oat method index was stashed at load time. 2367 oat_method_index = method->GetMethodIndex(); 2368 } else { 2369 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2370 // by search for its position in the declared virtual methods. 2371 oat_method_index = declaring_class->NumDirectMethods(); 2372 size_t end = declaring_class->NumVirtualMethods(); 2373 bool found = false; 2374 for (size_t i = 0; i < end; i++) { 2375 // Check method index instead of identity in case of duplicate method definitions. 2376 if (method->GetDexMethodIndex() == 2377 declaring_class->GetVirtualMethod(i)->GetDexMethodIndex()) { 2378 found = true; 2379 break; 2380 } 2381 oat_method_index++; 2382 } 2383 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2384 } 2385 DCHECK_EQ(oat_method_index, 2386 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2387 method->GetDeclaringClass()->GetDexClassDefIndex(), 2388 method->GetDexMethodIndex())); 2389 OatFile::OatClass oat_class; 2390 if (!FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2391 declaring_class->GetDexClassDefIndex(), 2392 &oat_class)) { 2393 return false; 2394 } 2395 2396 *oat_method = oat_class.GetOatMethod(oat_method_index); 2397 return true; 2398} 2399 2400// Special case to get oat code without overwriting a trampoline. 2401const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2402 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2403 if (method->IsProxyMethod()) { 2404 return GetQuickProxyInvokeHandler(); 2405 } 2406 OatFile::OatMethod oat_method; 2407 const void* result = nullptr; 2408 if (FindOatMethodFor(method, &oat_method)) { 2409 result = oat_method.GetQuickCode(); 2410 } 2411 2412 if (result == nullptr) { 2413 if (method->IsNative()) { 2414 // No code and native? Use generic trampoline. 2415 result = GetQuickGenericJniTrampoline(); 2416#if defined(ART_USE_PORTABLE_COMPILER) 2417 } else if (method->IsPortableCompiled()) { 2418 // No code? Do we expect portable code? 2419 result = GetQuickToPortableBridge(); 2420#endif 2421 } else { 2422 // No code? You must mean to go into the interpreter. 2423 result = GetQuickToInterpreterBridge(); 2424 } 2425 } 2426 return result; 2427} 2428 2429#if defined(ART_USE_PORTABLE_COMPILER) 2430const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2431 bool* have_portable_code) { 2432 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2433 *have_portable_code = false; 2434 if (method->IsProxyMethod()) { 2435 return GetPortableProxyInvokeHandler(); 2436 } 2437 OatFile::OatMethod oat_method; 2438 const void* result = nullptr; 2439 const void* quick_code = nullptr; 2440 if (FindOatMethodFor(method, &oat_method)) { 2441 result = oat_method.GetPortableCode(); 2442 quick_code = oat_method.GetQuickCode(); 2443 } 2444 2445 if (result == nullptr) { 2446 if (quick_code == nullptr) { 2447 // No code? You must mean to go into the interpreter. 2448 result = GetPortableToInterpreterBridge(); 2449 } else { 2450 // No code? But there's quick code, so use a bridge. 2451 result = GetPortableToQuickBridge(); 2452 } 2453 } else { 2454 *have_portable_code = true; 2455 } 2456 return result; 2457} 2458#endif 2459 2460const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2461 uint32_t method_idx) { 2462 OatFile::OatClass oat_class; 2463 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2464 return nullptr; 2465 } 2466 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2467 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2468} 2469 2470#if defined(ART_USE_PORTABLE_COMPILER) 2471const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2472 uint32_t method_idx) { 2473 OatFile::OatClass oat_class; 2474 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2475 return nullptr; 2476 } 2477 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2478 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2479} 2480#endif 2481 2482// Returns true if the method must run with interpreter, false otherwise. 2483static bool NeedsInterpreter( 2484 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2485 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2486 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2487 // No code: need interpreter. 2488 // May return true for native code, in the case of generic JNI 2489 // DCHECK(!method->IsNative()); 2490 return true; 2491 } 2492#ifdef ART_SEA_IR_MODE 2493 ScopedObjectAccess soa(Thread::Current()); 2494 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2495 LOG(INFO) << "Found " << PrettyMethod(method); 2496 return false; 2497 } 2498#endif 2499 // If interpreter mode is enabled, every method (except native and proxy) must 2500 // be run with interpreter. 2501 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2502 !method->IsNative() && !method->IsProxyMethod(); 2503} 2504 2505void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2506 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2507 if (klass->NumDirectMethods() == 0) { 2508 return; // No direct methods => no static methods. 2509 } 2510 Runtime* runtime = Runtime::Current(); 2511 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2512 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2513 return; // OAT file unavailable. 2514 } 2515 } 2516 2517 const DexFile& dex_file = klass->GetDexFile(); 2518 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2519 CHECK(dex_class_def != nullptr); 2520 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2521 // There should always be class data if there were direct methods. 2522 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2523 ClassDataItemIterator it(dex_file, class_data); 2524 // Skip fields 2525 while (it.HasNextStaticField()) { 2526 it.Next(); 2527 } 2528 while (it.HasNextInstanceField()) { 2529 it.Next(); 2530 } 2531 OatFile::OatClass oat_class; 2532 bool has_oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class); 2533 // Link the code of methods skipped by LinkCode. 2534 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2535 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2536 if (!method->IsStatic()) { 2537 // Only update static methods. 2538 continue; 2539 } 2540 const void* portable_code = nullptr; 2541 const void* quick_code = nullptr; 2542 if (has_oat_class) { 2543 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2544 portable_code = oat_method.GetPortableCode(); 2545 quick_code = oat_method.GetQuickCode(); 2546 } 2547 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2548 bool have_portable_code = false; 2549 if (enter_interpreter) { 2550 // Use interpreter entry point. 2551 // Check whether the method is native, in which case it's generic JNI. 2552 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2553 quick_code = GetQuickGenericJniTrampoline(); 2554#if defined(ART_USE_PORTABLE_COMPILER) 2555 portable_code = GetPortableToQuickBridge(); 2556#endif 2557 } else { 2558#if defined(ART_USE_PORTABLE_COMPILER) 2559 portable_code = GetPortableToInterpreterBridge(); 2560#endif 2561 quick_code = GetQuickToInterpreterBridge(); 2562 } 2563 } else { 2564#if defined(ART_USE_PORTABLE_COMPILER) 2565 if (portable_code == nullptr) { 2566 portable_code = GetPortableToQuickBridge(); 2567 } else { 2568 have_portable_code = true; 2569 } 2570 if (quick_code == nullptr) { 2571 quick_code = GetQuickToPortableBridge(); 2572 } 2573#else 2574 if (quick_code == nullptr) { 2575 quick_code = GetQuickToInterpreterBridge(); 2576 } 2577#endif 2578 } 2579 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2580 have_portable_code); 2581 } 2582 // Ignore virtual methods on the iterator. 2583} 2584 2585void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 2586 const DexFile& dex_file, uint32_t dex_method_index, 2587 uint32_t method_index) { 2588 if (Runtime::Current()->IsCompiler()) { 2589 // The following code only applies to a non-compiler runtime. 2590 return; 2591 } 2592 // Method shouldn't have already been linked. 2593 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2594#if defined(ART_USE_PORTABLE_COMPILER) 2595 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2596#endif 2597 if (oat_class != nullptr) { 2598 // Every kind of method should at least get an invoke stub from the oat_method. 2599 // non-abstract methods also get their code pointers. 2600 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2601 oat_method.LinkMethod(method.Get()); 2602 } 2603 2604 // Install entry point from interpreter. 2605 bool enter_interpreter = NeedsInterpreter(method.Get(), 2606 method->GetEntryPointFromQuickCompiledCode(), 2607#if defined(ART_USE_PORTABLE_COMPILER) 2608 method->GetEntryPointFromPortableCompiledCode()); 2609#else 2610 nullptr); 2611#endif 2612 if (enter_interpreter && !method->IsNative()) { 2613 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2614 } else { 2615 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2616 } 2617 2618 if (method->IsAbstract()) { 2619 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2620#if defined(ART_USE_PORTABLE_COMPILER) 2621 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2622#endif 2623 return; 2624 } 2625 2626 bool have_portable_code = false; 2627 if (method->IsStatic() && !method->IsConstructor()) { 2628 // For static methods excluding the class initializer, install the trampoline. 2629 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2630 // after initializing class (see ClassLinker::InitializeClass method). 2631 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2632#if defined(ART_USE_PORTABLE_COMPILER) 2633 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2634#endif 2635 } else if (enter_interpreter) { 2636 if (!method->IsNative()) { 2637 // Set entry point from compiled code if there's no code or in interpreter only mode. 2638 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2639#if defined(ART_USE_PORTABLE_COMPILER) 2640 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2641#endif 2642 } else { 2643 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2644#if defined(ART_USE_PORTABLE_COMPILER) 2645 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2646#endif 2647 } 2648#if defined(ART_USE_PORTABLE_COMPILER) 2649 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2650 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2651 have_portable_code = true; 2652 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2653#endif 2654 } else { 2655 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2656#if defined(ART_USE_PORTABLE_COMPILER) 2657 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2658#endif 2659 } 2660 2661 if (method->IsNative()) { 2662 // Unregistering restores the dlsym lookup stub. 2663 method->UnregisterNative(Thread::Current()); 2664 2665 if (enter_interpreter) { 2666 // We have a native method here without code. Then it should have either the GenericJni 2667 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2668 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2669 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2670 } 2671 } 2672 2673 // Allow instrumentation its chance to hijack code. 2674 Runtime* runtime = Runtime::Current(); 2675 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2676 method->GetEntryPointFromQuickCompiledCode(), 2677#if defined(ART_USE_PORTABLE_COMPILER) 2678 method->GetEntryPointFromPortableCompiledCode(), 2679#else 2680 nullptr, 2681#endif 2682 have_portable_code); 2683} 2684 2685void ClassLinker::LoadClass(const DexFile& dex_file, 2686 const DexFile::ClassDef& dex_class_def, 2687 Handle<mirror::Class> klass, 2688 mirror::ClassLoader* class_loader) { 2689 CHECK(klass.Get() != nullptr); 2690 CHECK(klass->GetDexCache() != nullptr); 2691 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2692 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2693 CHECK(descriptor != nullptr); 2694 2695 klass->SetClass(GetClassRoot(kJavaLangClass)); 2696 if (kUseBakerOrBrooksReadBarrier) { 2697 klass->AssertReadBarrierPointer(); 2698 } 2699 uint32_t access_flags = dex_class_def.GetJavaAccessFlags(); 2700 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2701 klass->SetAccessFlags(access_flags); 2702 klass->SetClassLoader(class_loader); 2703 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2704 klass->SetStatus(mirror::Class::kStatusIdx, nullptr); 2705 2706 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2707 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2708 2709 const byte* class_data = dex_file.GetClassData(dex_class_def); 2710 if (class_data == nullptr) { 2711 return; // no fields or methods - for example a marker interface 2712 } 2713 2714 OatFile::OatClass oat_class; 2715 if (Runtime::Current()->IsStarted() 2716 && !Runtime::Current()->UseCompileTimeClassPath() 2717 && FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class)) { 2718 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2719 } else { 2720 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2721 } 2722} 2723 2724void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2725 const byte* class_data, 2726 Handle<mirror::Class> klass, 2727 mirror::ClassLoader* class_loader, 2728 const OatFile::OatClass* oat_class) { 2729 // Load fields. 2730 ClassDataItemIterator it(dex_file, class_data); 2731 Thread* self = Thread::Current(); 2732 if (it.NumStaticFields() != 0) { 2733 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2734 if (UNLIKELY(statics == nullptr)) { 2735 CHECK(self->IsExceptionPending()); // OOME. 2736 return; 2737 } 2738 klass->SetSFields(statics); 2739 } 2740 if (it.NumInstanceFields() != 0) { 2741 mirror::ObjectArray<mirror::ArtField>* fields = 2742 AllocArtFieldArray(self, it.NumInstanceFields()); 2743 if (UNLIKELY(fields == nullptr)) { 2744 CHECK(self->IsExceptionPending()); // OOME. 2745 return; 2746 } 2747 klass->SetIFields(fields); 2748 } 2749 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2750 StackHandleScope<1> hs(self); 2751 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2752 if (UNLIKELY(sfield.Get() == nullptr)) { 2753 CHECK(self->IsExceptionPending()); // OOME. 2754 return; 2755 } 2756 klass->SetStaticField(i, sfield.Get()); 2757 LoadField(dex_file, it, klass, sfield); 2758 } 2759 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2760 StackHandleScope<1> hs(self); 2761 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2762 if (UNLIKELY(ifield.Get() == nullptr)) { 2763 CHECK(self->IsExceptionPending()); // OOME. 2764 return; 2765 } 2766 klass->SetInstanceField(i, ifield.Get()); 2767 LoadField(dex_file, it, klass, ifield); 2768 } 2769 2770 // Load methods. 2771 if (it.NumDirectMethods() != 0) { 2772 // TODO: append direct methods to class object 2773 mirror::ObjectArray<mirror::ArtMethod>* directs = 2774 AllocArtMethodArray(self, it.NumDirectMethods()); 2775 if (UNLIKELY(directs == nullptr)) { 2776 CHECK(self->IsExceptionPending()); // OOME. 2777 return; 2778 } 2779 klass->SetDirectMethods(directs); 2780 } 2781 if (it.NumVirtualMethods() != 0) { 2782 // TODO: append direct methods to class object 2783 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2784 AllocArtMethodArray(self, it.NumVirtualMethods()); 2785 if (UNLIKELY(virtuals == nullptr)) { 2786 CHECK(self->IsExceptionPending()); // OOME. 2787 return; 2788 } 2789 klass->SetVirtualMethods(virtuals); 2790 } 2791 size_t class_def_method_index = 0; 2792 uint32_t last_dex_method_index = DexFile::kDexNoIndex; 2793 size_t last_class_def_method_index = 0; 2794 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2795 StackHandleScope<1> hs(self); 2796 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2797 if (UNLIKELY(method.Get() == nullptr)) { 2798 CHECK(self->IsExceptionPending()); // OOME. 2799 return; 2800 } 2801 klass->SetDirectMethod(i, method.Get()); 2802 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2803 uint32_t it_method_index = it.GetMemberIndex(); 2804 if (last_dex_method_index == it_method_index) { 2805 // duplicate case 2806 method->SetMethodIndex(last_class_def_method_index); 2807 } else { 2808 method->SetMethodIndex(class_def_method_index); 2809 last_dex_method_index = it_method_index; 2810 last_class_def_method_index = class_def_method_index; 2811 } 2812 class_def_method_index++; 2813 } 2814 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2815 StackHandleScope<1> hs(self); 2816 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2817 if (UNLIKELY(method.Get() == nullptr)) { 2818 CHECK(self->IsExceptionPending()); // OOME. 2819 return; 2820 } 2821 klass->SetVirtualMethod(i, method.Get()); 2822 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2823 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2824 class_def_method_index++; 2825 } 2826 DCHECK(!it.HasNext()); 2827} 2828 2829void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2830 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2831 uint32_t field_idx = it.GetMemberIndex(); 2832 dst->SetDexFieldIndex(field_idx); 2833 dst->SetDeclaringClass(klass.Get()); 2834 dst->SetAccessFlags(it.GetFieldAccessFlags()); 2835} 2836 2837mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2838 const ClassDataItemIterator& it, 2839 Handle<mirror::Class> klass) { 2840 uint32_t dex_method_idx = it.GetMemberIndex(); 2841 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2842 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2843 2844 mirror::ArtMethod* dst = AllocArtMethod(self); 2845 if (UNLIKELY(dst == nullptr)) { 2846 CHECK(self->IsExceptionPending()); // OOME. 2847 return nullptr; 2848 } 2849 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2850 2851 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2852 dst->SetDexMethodIndex(dex_method_idx); 2853 dst->SetDeclaringClass(klass.Get()); 2854 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2855 2856 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2857 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2858 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2859 2860 uint32_t access_flags = it.GetMethodAccessFlags(); 2861 2862 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2863 // Set finalizable flag on declaring class. 2864 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2865 // Void return type. 2866 if (klass->GetClassLoader() != nullptr) { // All non-boot finalizer methods are flagged. 2867 klass->SetFinalizable(); 2868 } else { 2869 std::string temp; 2870 const char* klass_descriptor = klass->GetDescriptor(&temp); 2871 // The Enum class declares a "final" finalize() method to prevent subclasses from 2872 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2873 // subclasses, so we exclude it here. 2874 // We also want to avoid setting the flag on Object, where we know that finalize() is 2875 // empty. 2876 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2877 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2878 klass->SetFinalizable(); 2879 } 2880 } 2881 } 2882 } else if (method_name[0] == '<') { 2883 // Fix broken access flags for initializers. Bug 11157540. 2884 bool is_init = (strcmp("<init>", method_name) == 0); 2885 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2886 if (UNLIKELY(!is_init && !is_clinit)) { 2887 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2888 } else { 2889 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2890 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2891 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2892 access_flags |= kAccConstructor; 2893 } 2894 } 2895 } 2896 dst->SetAccessFlags(access_flags); 2897 2898 self->EndAssertNoThreadSuspension(old_cause); 2899 return dst; 2900} 2901 2902void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2903 Thread* self = Thread::Current(); 2904 StackHandleScope<1> hs(self); 2905 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2906 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 2907 << dex_file.GetLocation(); 2908 AppendToBootClassPath(dex_file, dex_cache); 2909} 2910 2911void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2912 Handle<mirror::DexCache> dex_cache) { 2913 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 2914 boot_class_path_.push_back(&dex_file); 2915 RegisterDexFile(dex_file, dex_cache); 2916} 2917 2918bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2919 dex_lock_.AssertSharedHeld(Thread::Current()); 2920 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2921 mirror::DexCache* dex_cache = GetDexCache(i); 2922 if (dex_cache->GetDexFile() == &dex_file) { 2923 return true; 2924 } 2925 } 2926 return false; 2927} 2928 2929bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2930 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2931 return IsDexFileRegisteredLocked(dex_file); 2932} 2933 2934void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2935 Handle<mirror::DexCache> dex_cache) { 2936 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2937 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation(); 2938 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2939 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2940 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2941 dex_cache->SetDexFile(&dex_file); 2942 if (log_new_dex_caches_roots_) { 2943 // TODO: This is not safe if we can remove dex caches. 2944 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2945 } 2946} 2947 2948void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2949 Thread* self = Thread::Current(); 2950 { 2951 ReaderMutexLock mu(self, dex_lock_); 2952 if (IsDexFileRegisteredLocked(dex_file)) { 2953 return; 2954 } 2955 } 2956 // Don't alloc while holding the lock, since allocation may need to 2957 // suspend all threads and another thread may need the dex_lock_ to 2958 // get to a suspend point. 2959 StackHandleScope<1> hs(self); 2960 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2961 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for " 2962 << dex_file.GetLocation(); 2963 { 2964 WriterMutexLock mu(self, dex_lock_); 2965 if (IsDexFileRegisteredLocked(dex_file)) { 2966 return; 2967 } 2968 RegisterDexFileLocked(dex_file, dex_cache); 2969 } 2970} 2971 2972void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2973 Handle<mirror::DexCache> dex_cache) { 2974 WriterMutexLock mu(Thread::Current(), dex_lock_); 2975 RegisterDexFileLocked(dex_file, dex_cache); 2976} 2977 2978mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2979 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2980 // Search assuming unique-ness of dex file. 2981 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2982 mirror::DexCache* dex_cache = GetDexCache(i); 2983 if (dex_cache->GetDexFile() == &dex_file) { 2984 return dex_cache; 2985 } 2986 } 2987 // Search matching by location name. 2988 std::string location(dex_file.GetLocation()); 2989 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2990 mirror::DexCache* dex_cache = GetDexCache(i); 2991 if (dex_cache->GetDexFile()->GetLocation() == location) { 2992 return dex_cache; 2993 } 2994 } 2995 // Failure, dump diagnostic and abort. 2996 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2997 mirror::DexCache* dex_cache = GetDexCache(i); 2998 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2999 } 3000 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 3001 return nullptr; 3002} 3003 3004void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 3005 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3006 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3007 mirror::DexCache* dex_cache = GetDexCache(i); 3008 dex_cache->Fixup(resolution_method); 3009 } 3010} 3011 3012mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 3013 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 3014 if (UNLIKELY(klass == nullptr)) { 3015 return nullptr; 3016 } 3017 return InitializePrimitiveClass(klass, type); 3018} 3019 3020mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 3021 Primitive::Type type) { 3022 CHECK(primitive_class != nullptr); 3023 // Must hold lock on object when initializing. 3024 Thread* self = Thread::Current(); 3025 StackHandleScope<1> hs(self); 3026 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 3027 ObjectLock<mirror::Class> lock(self, h_class); 3028 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 3029 primitive_class->SetPrimitiveType(type); 3030 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 3031 const char* descriptor = Primitive::Descriptor(type); 3032 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 3033 CHECK(existing == nullptr) << "InitPrimitiveClass(" << type << ") failed"; 3034 return primitive_class; 3035} 3036 3037// Create an array class (i.e. the class object for the array, not the 3038// array itself). "descriptor" looks like "[C" or "[[[[B" or 3039// "[Ljava/lang/String;". 3040// 3041// If "descriptor" refers to an array of primitives, look up the 3042// primitive type's internally-generated class object. 3043// 3044// "class_loader" is the class loader of the class that's referring to 3045// us. It's used to ensure that we're looking for the element type in 3046// the right context. It does NOT become the class loader for the 3047// array class; that always comes from the base element class. 3048// 3049// Returns nullptr with an exception raised on failure. 3050mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 3051 Handle<mirror::ClassLoader> class_loader) { 3052 // Identify the underlying component type 3053 CHECK_EQ('[', descriptor[0]); 3054 StackHandleScope<2> hs(self); 3055 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 3056 if (component_type.Get() == nullptr) { 3057 DCHECK(self->IsExceptionPending()); 3058 // We need to accept erroneous classes as component types. 3059 component_type.Assign(LookupClass(descriptor + 1, class_loader.Get())); 3060 if (component_type.Get() == nullptr) { 3061 DCHECK(self->IsExceptionPending()); 3062 return nullptr; 3063 } else { 3064 self->ClearException(); 3065 } 3066 } 3067 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 3068 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 3069 return nullptr; 3070 } 3071 // See if the component type is already loaded. Array classes are 3072 // always associated with the class loader of their underlying 3073 // element type -- an array of Strings goes with the loader for 3074 // java/lang/String -- so we need to look for it there. (The 3075 // caller should have checked for the existence of the class 3076 // before calling here, but they did so with *their* class loader, 3077 // not the component type's loader.) 3078 // 3079 // If we find it, the caller adds "loader" to the class' initiating 3080 // loader list, which should prevent us from going through this again. 3081 // 3082 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 3083 // are the same, because our caller (FindClass) just did the 3084 // lookup. (Even if we get this wrong we still have correct behavior, 3085 // because we effectively do this lookup again when we add the new 3086 // class to the hash table --- necessary because of possible races with 3087 // other threads.) 3088 if (class_loader.Get() != component_type->GetClassLoader()) { 3089 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 3090 if (new_class != nullptr) { 3091 return new_class; 3092 } 3093 } 3094 3095 // Fill out the fields in the Class. 3096 // 3097 // It is possible to execute some methods against arrays, because 3098 // all arrays are subclasses of java_lang_Object_, so we need to set 3099 // up a vtable. We can just point at the one in java_lang_Object_. 3100 // 3101 // Array classes are simple enough that we don't need to do a full 3102 // link step. 3103 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 3104 if (UNLIKELY(!init_done_)) { 3105 // Classes that were hand created, ie not by FindSystemClass 3106 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 3107 new_class.Assign(GetClassRoot(kClassArrayClass)); 3108 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 3109 new_class.Assign(GetClassRoot(kObjectArrayClass)); 3110 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 3111 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 3112 } else if (strcmp(descriptor, 3113 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 3114 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 3115 } else if (strcmp(descriptor, 3116 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 3117 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 3118 } else if (strcmp(descriptor, "[C") == 0) { 3119 new_class.Assign(GetClassRoot(kCharArrayClass)); 3120 } else if (strcmp(descriptor, "[I") == 0) { 3121 new_class.Assign(GetClassRoot(kIntArrayClass)); 3122 } 3123 } 3124 if (new_class.Get() == nullptr) { 3125 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 3126 if (new_class.Get() == nullptr) { 3127 return nullptr; 3128 } 3129 new_class->SetComponentType(component_type.Get()); 3130 } 3131 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 3132 DCHECK(new_class->GetComponentType() != nullptr); 3133 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 3134 new_class->SetSuperClass(java_lang_Object); 3135 new_class->SetVTable(java_lang_Object->GetVTable()); 3136 new_class->SetPrimitiveType(Primitive::kPrimNot); 3137 new_class->SetClassLoader(component_type->GetClassLoader()); 3138 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 3139 new_class->PopulateEmbeddedImtAndVTable(); 3140 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 3141 // don't need to set new_class->SetObjectSize(..) 3142 // because Object::SizeOf delegates to Array::SizeOf 3143 3144 3145 // All arrays have java/lang/Cloneable and java/io/Serializable as 3146 // interfaces. We need to set that up here, so that stuff like 3147 // "instanceof" works right. 3148 // 3149 // Note: The GC could run during the call to FindSystemClass, 3150 // so we need to make sure the class object is GC-valid while we're in 3151 // there. Do this by clearing the interface list so the GC will just 3152 // think that the entries are null. 3153 3154 3155 // Use the single, global copies of "interfaces" and "iftable" 3156 // (remember not to free them for arrays). 3157 { 3158 mirror::IfTable* array_iftable = array_iftable_.Read(); 3159 CHECK(array_iftable != nullptr); 3160 new_class->SetIfTable(array_iftable); 3161 } 3162 3163 // Inherit access flags from the component type. 3164 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 3165 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 3166 access_flags &= kAccJavaFlagsMask; 3167 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 3168 // and remove "interface". 3169 access_flags |= kAccAbstract | kAccFinal; 3170 access_flags &= ~kAccInterface; 3171 3172 new_class->SetAccessFlags(access_flags); 3173 3174 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 3175 if (existing == nullptr) { 3176 return new_class.Get(); 3177 } 3178 // Another thread must have loaded the class after we 3179 // started but before we finished. Abandon what we've 3180 // done. 3181 // 3182 // (Yes, this happens.) 3183 3184 return existing; 3185} 3186 3187mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 3188 switch (type) { 3189 case 'B': 3190 return GetClassRoot(kPrimitiveByte); 3191 case 'C': 3192 return GetClassRoot(kPrimitiveChar); 3193 case 'D': 3194 return GetClassRoot(kPrimitiveDouble); 3195 case 'F': 3196 return GetClassRoot(kPrimitiveFloat); 3197 case 'I': 3198 return GetClassRoot(kPrimitiveInt); 3199 case 'J': 3200 return GetClassRoot(kPrimitiveLong); 3201 case 'S': 3202 return GetClassRoot(kPrimitiveShort); 3203 case 'Z': 3204 return GetClassRoot(kPrimitiveBoolean); 3205 case 'V': 3206 return GetClassRoot(kPrimitiveVoid); 3207 default: 3208 break; 3209 } 3210 std::string printable_type(PrintableChar(type)); 3211 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 3212 return nullptr; 3213} 3214 3215mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 3216 size_t hash) { 3217 if (VLOG_IS_ON(class_linker)) { 3218 mirror::DexCache* dex_cache = klass->GetDexCache(); 3219 std::string source; 3220 if (dex_cache != nullptr) { 3221 source += " from "; 3222 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3223 } 3224 LOG(INFO) << "Loaded class " << descriptor << source; 3225 } 3226 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3227 mirror::Class* existing = 3228 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3229 if (existing != nullptr) { 3230 return existing; 3231 } 3232 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == nullptr && 3233 dex_cache_image_class_lookup_required_) { 3234 // Check a class loaded with the system class loader matches one in the image if the class 3235 // is in the image. 3236 existing = LookupClassFromImage(descriptor); 3237 if (existing != nullptr) { 3238 CHECK(klass == existing); 3239 } 3240 } 3241 VerifyObject(klass); 3242 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3243 if (log_new_class_table_roots_) { 3244 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3245 } 3246 return nullptr; 3247} 3248 3249mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3250 size_t hash) { 3251 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3252 mirror::Class* existing = 3253 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3254 3255 if (existing == nullptr) { 3256 CHECK(klass->IsProxyClass()); 3257 return nullptr; 3258 } 3259 3260 CHECK_NE(existing, klass) << descriptor; 3261 CHECK(!existing->IsResolved()) << descriptor; 3262 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3263 3264 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3265 it != end && it->first == hash; ++it) { 3266 mirror::Class* klass = it->second.Read(); 3267 if (klass == existing) { 3268 class_table_.erase(it); 3269 break; 3270 } 3271 } 3272 3273 CHECK(!klass->IsTemp()) << descriptor; 3274 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3275 dex_cache_image_class_lookup_required_) { 3276 // Check a class loaded with the system class loader matches one in the image if the class 3277 // is in the image. 3278 existing = LookupClassFromImage(descriptor); 3279 if (existing != nullptr) { 3280 CHECK(klass == existing) << descriptor; 3281 } 3282 } 3283 VerifyObject(klass); 3284 3285 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3286 if (log_new_class_table_roots_) { 3287 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3288 } 3289 3290 return existing; 3291} 3292 3293bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 3294 size_t hash = Hash(descriptor); 3295 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3296 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3297 it != end && it->first == hash; 3298 ++it) { 3299 mirror::Class* klass = it->second.Read(); 3300 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3301 class_table_.erase(it); 3302 return true; 3303 } 3304 } 3305 return false; 3306} 3307 3308mirror::Class* ClassLinker::LookupClass(const char* descriptor, 3309 const mirror::ClassLoader* class_loader) { 3310 size_t hash = Hash(descriptor); 3311 { 3312 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3313 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3314 if (result != nullptr) { 3315 return result; 3316 } 3317 } 3318 if (class_loader != nullptr || !dex_cache_image_class_lookup_required_) { 3319 return nullptr; 3320 } else { 3321 // Lookup failed but need to search dex_caches_. 3322 mirror::Class* result = LookupClassFromImage(descriptor); 3323 if (result != nullptr) { 3324 InsertClass(descriptor, result, hash); 3325 } else { 3326 // Searching the image dex files/caches failed, we don't want to get into this situation 3327 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3328 // classes into the class table. 3329 constexpr uint32_t kMaxFailedDexCacheLookups = 1000; 3330 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3331 MoveImageClassesToClassTable(); 3332 } 3333 } 3334 return result; 3335 } 3336} 3337 3338mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3339 const mirror::ClassLoader* class_loader, 3340 size_t hash) { 3341 auto end = class_table_.end(); 3342 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3343 mirror::Class* klass = it->second.Read(); 3344 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3345 if (kIsDebugBuild) { 3346 // Check for duplicates in the table. 3347 for (++it; it != end && it->first == hash; ++it) { 3348 mirror::Class* klass2 = it->second.Read(); 3349 CHECK(!(klass2->GetClassLoader() == class_loader && 3350 klass2->DescriptorEquals(descriptor))) 3351 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3352 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3353 } 3354 } 3355 return klass; 3356 } 3357 } 3358 return nullptr; 3359} 3360 3361static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3362 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3363 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3364 CHECK(image != nullptr); 3365 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3366 return root->AsObjectArray<mirror::DexCache>(); 3367} 3368 3369void ClassLinker::MoveImageClassesToClassTable() { 3370 Thread* self = Thread::Current(); 3371 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3372 if (!dex_cache_image_class_lookup_required_) { 3373 return; // All dex cache classes are already in the class table. 3374 } 3375 const char* old_no_suspend_cause = 3376 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 3377 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3378 std::string temp; 3379 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3380 mirror::DexCache* dex_cache = dex_caches->Get(i); 3381 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3382 for (int32_t j = 0; j < types->GetLength(); j++) { 3383 mirror::Class* klass = types->Get(j); 3384 if (klass != nullptr) { 3385 DCHECK(klass->GetClassLoader() == nullptr); 3386 const char* descriptor = klass->GetDescriptor(&temp); 3387 size_t hash = Hash(descriptor); 3388 mirror::Class* existing = LookupClassFromTableLocked(descriptor, nullptr, hash); 3389 if (existing != nullptr) { 3390 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3391 << PrettyClassAndClassLoader(klass); 3392 } else { 3393 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3394 if (log_new_class_table_roots_) { 3395 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3396 } 3397 } 3398 } 3399 } 3400 } 3401 dex_cache_image_class_lookup_required_ = false; 3402 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3403} 3404 3405mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3406 Thread* self = Thread::Current(); 3407 const char* old_no_suspend_cause = 3408 self->StartAssertNoThreadSuspension("Image class lookup"); 3409 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3410 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3411 mirror::DexCache* dex_cache = dex_caches->Get(i); 3412 const DexFile* dex_file = dex_cache->GetDexFile(); 3413 // Try binary searching the string/type index. 3414 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3415 if (string_id != nullptr) { 3416 const DexFile::TypeId* type_id = 3417 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3418 if (type_id != nullptr) { 3419 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3420 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3421 if (klass != nullptr) { 3422 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3423 return klass; 3424 } 3425 } 3426 } 3427 } 3428 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3429 return nullptr; 3430} 3431 3432void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3433 result.clear(); 3434 if (dex_cache_image_class_lookup_required_) { 3435 MoveImageClassesToClassTable(); 3436 } 3437 size_t hash = Hash(descriptor); 3438 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3439 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3440 it != end && it->first == hash; ++it) { 3441 mirror::Class* klass = it->second.Read(); 3442 if (klass->DescriptorEquals(descriptor)) { 3443 result.push_back(klass); 3444 } 3445 } 3446} 3447 3448void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 3449 // TODO: assert that the monitor on the Class is held 3450 Thread* self = Thread::Current(); 3451 ObjectLock<mirror::Class> lock(self, klass); 3452 3453 // Don't attempt to re-verify if already sufficiently verified. 3454 if (klass->IsVerified()) { 3455 EnsurePreverifiedMethods(klass); 3456 return; 3457 } 3458 if (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler()) { 3459 return; 3460 } 3461 3462 // The class might already be erroneous, for example at compile time if we attempted to verify 3463 // this class as a parent to another. 3464 if (klass->IsErroneous()) { 3465 ThrowEarlierClassFailure(klass.Get()); 3466 return; 3467 } 3468 3469 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3470 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3471 } else { 3472 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3473 << PrettyClass(klass.Get()); 3474 CHECK(!Runtime::Current()->IsCompiler()); 3475 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3476 } 3477 3478 // Skip verification if disabled. 3479 if (!Runtime::Current()->IsVerificationEnabled()) { 3480 klass->SetStatus(mirror::Class::kStatusVerified, self); 3481 EnsurePreverifiedMethods(klass); 3482 return; 3483 } 3484 3485 // Verify super class. 3486 StackHandleScope<2> hs(self); 3487 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3488 if (super.Get() != nullptr) { 3489 // Acquire lock to prevent races on verifying the super class. 3490 ObjectLock<mirror::Class> lock(self, super); 3491 3492 if (!super->IsVerified() && !super->IsErroneous()) { 3493 VerifyClass(super); 3494 } 3495 if (!super->IsCompileTimeVerified()) { 3496 std::string error_msg( 3497 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3498 PrettyDescriptor(klass.Get()).c_str(), 3499 PrettyDescriptor(super.Get()).c_str())); 3500 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3501 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3502 if (cause.Get() != nullptr) { 3503 self->ClearException(); 3504 } 3505 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3506 if (cause.Get() != nullptr) { 3507 self->GetException(nullptr)->SetCause(cause.Get()); 3508 } 3509 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3510 if (Runtime::Current()->IsCompiler()) { 3511 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3512 } 3513 klass->SetStatus(mirror::Class::kStatusError, self); 3514 return; 3515 } 3516 } 3517 3518 // Try to use verification information from the oat file, otherwise do runtime verification. 3519 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3520 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3521 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3522 if (oat_file_class_status == mirror::Class::kStatusError) { 3523 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3524 << PrettyDescriptor(klass.Get()) << " in " 3525 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3526 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3527 PrettyDescriptor(klass.Get()).c_str()); 3528 klass->SetStatus(mirror::Class::kStatusError, self); 3529 return; 3530 } 3531 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3532 std::string error_msg; 3533 if (!preverified) { 3534 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 3535 Runtime::Current()->IsCompiler(), 3536 &error_msg); 3537 } 3538 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3539 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3540 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3541 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3542 << " because: " << error_msg; 3543 } 3544 self->AssertNoPendingException(); 3545 // Make sure all classes referenced by catch blocks are resolved. 3546 ResolveClassExceptionHandlerTypes(dex_file, klass); 3547 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3548 // Even though there were no verifier failures we need to respect whether the super-class 3549 // was verified or requiring runtime reverification. 3550 if (super.Get() == nullptr || super->IsVerified()) { 3551 klass->SetStatus(mirror::Class::kStatusVerified, self); 3552 } else { 3553 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3554 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3555 // Pretend a soft failure occured so that we don't consider the class verified below. 3556 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3557 } 3558 } else { 3559 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3560 // Soft failures at compile time should be retried at runtime. Soft 3561 // failures at runtime will be handled by slow paths in the generated 3562 // code. Set status accordingly. 3563 if (Runtime::Current()->IsCompiler()) { 3564 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3565 } else { 3566 klass->SetStatus(mirror::Class::kStatusVerified, self); 3567 // As this is a fake verified status, make sure the methods are _not_ marked preverified 3568 // later. 3569 klass->SetAccessFlags(klass->GetAccessFlags() | kAccPreverified); 3570 } 3571 } 3572 } else { 3573 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3574 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3575 << " because: " << error_msg; 3576 self->AssertNoPendingException(); 3577 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3578 klass->SetStatus(mirror::Class::kStatusError, self); 3579 } 3580 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3581 // Class is verified so we don't need to do any access check on its methods. 3582 // Let the interpreter know it by setting the kAccPreverified flag onto each 3583 // method. 3584 // Note: we're going here during compilation and at runtime. When we set the 3585 // kAccPreverified flag when compiling image classes, the flag is recorded 3586 // in the image and is set when loading the image. 3587 EnsurePreverifiedMethods(klass); 3588 } 3589} 3590 3591void ClassLinker::EnsurePreverifiedMethods(Handle<mirror::Class> klass) { 3592 if ((klass->GetAccessFlags() & kAccPreverified) == 0) { 3593 klass->SetPreverifiedFlagOnAllMethods(); 3594 klass->SetAccessFlags(klass->GetAccessFlags() | kAccPreverified); 3595 } 3596} 3597 3598bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3599 mirror::Class::Status& oat_file_class_status) { 3600 // If we're compiling, we can only verify the class using the oat file if 3601 // we are not compiling the image or if the class we're verifying is not part of 3602 // the app. In other words, we will only check for preverification of bootclasspath 3603 // classes. 3604 if (Runtime::Current()->IsCompiler()) { 3605 // Are we compiling the bootclasspath? 3606 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3607 return false; 3608 } 3609 // We are compiling an app (not the image). 3610 3611 // Is this an app class? (I.e. not a bootclasspath class) 3612 if (klass->GetClassLoader() != nullptr) { 3613 return false; 3614 } 3615 } 3616 3617 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 3618 // In case we run without an image there won't be a backing oat file. 3619 if (oat_dex_file == nullptr) { 3620 return false; 3621 } 3622 3623 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3624 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3625 if (oat_file_class_status == mirror::Class::kStatusVerified || 3626 oat_file_class_status == mirror::Class::kStatusInitialized) { 3627 return true; 3628 } 3629 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3630 // Compile time verification failed with a soft error. Compile time verification can fail 3631 // because we have incomplete type information. Consider the following: 3632 // class ... { 3633 // Foo x; 3634 // .... () { 3635 // if (...) { 3636 // v1 gets assigned a type of resolved class Foo 3637 // } else { 3638 // v1 gets assigned a type of unresolved class Bar 3639 // } 3640 // iput x = v1 3641 // } } 3642 // when we merge v1 following the if-the-else it results in Conflict 3643 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3644 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3645 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3646 // at compile time). 3647 return false; 3648 } 3649 if (oat_file_class_status == mirror::Class::kStatusError) { 3650 // Compile time verification failed with a hard error. This is caused by invalid instructions 3651 // in the class. These errors are unrecoverable. 3652 return false; 3653 } 3654 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3655 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3656 // not loading the class. 3657 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3658 // isn't a problem and this case shouldn't occur 3659 return false; 3660 } 3661 std::string temp; 3662 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3663 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3664 << klass->GetDescriptor(&temp); 3665 3666 return false; 3667} 3668 3669void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3670 Handle<mirror::Class> klass) { 3671 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3672 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3673 } 3674 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3675 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3676 } 3677} 3678 3679void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3680 mirror::ArtMethod* method) { 3681 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3682 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3683 if (code_item == nullptr) { 3684 return; // native or abstract method 3685 } 3686 if (code_item->tries_size_ == 0) { 3687 return; // nothing to process 3688 } 3689 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3690 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3691 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3692 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3693 CatchHandlerIterator iterator(handlers_ptr); 3694 for (; iterator.HasNext(); iterator.Next()) { 3695 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3696 // unresolved exception types will be ignored by exception delivery 3697 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3698 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3699 if (exception_type == nullptr) { 3700 DCHECK(Thread::Current()->IsExceptionPending()); 3701 Thread::Current()->ClearException(); 3702 } 3703 } 3704 } 3705 handlers_ptr = iterator.EndDataPointer(); 3706 } 3707} 3708 3709static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3710static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3711 Handle<mirror::ArtMethod> prototype); 3712 3713mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3714 jobjectArray interfaces, jobject loader, 3715 jobjectArray methods, jobjectArray throws) { 3716 Thread* self = soa.Self(); 3717 StackHandleScope<8> hs(self); 3718 Handle<mirror::Class> klass(hs.NewHandle( 3719 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3720 if (klass.Get() == nullptr) { 3721 CHECK(self->IsExceptionPending()); // OOME. 3722 return nullptr; 3723 } 3724 DCHECK(klass->GetClass() != nullptr); 3725 klass->SetObjectSize(sizeof(mirror::Proxy)); 3726 // Set the class access flags incl. preverified, so we do not try to set the flag on the methods. 3727 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal | kAccPreverified); 3728 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3729 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3730 klass->SetName(soa.Decode<mirror::String*>(name)); 3731 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3732 klass->SetDexCache(proxy_class->GetDexCache()); 3733 klass->SetStatus(mirror::Class::kStatusIdx, self); 3734 3735 // Instance fields are inherited, but we add a couple of static fields... 3736 { 3737 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3738 if (UNLIKELY(sfields == nullptr)) { 3739 CHECK(self->IsExceptionPending()); // OOME. 3740 return nullptr; 3741 } 3742 klass->SetSFields(sfields); 3743 } 3744 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3745 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3746 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3747 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3748 CHECK(self->IsExceptionPending()); // OOME. 3749 return nullptr; 3750 } 3751 klass->SetStaticField(0, interfaces_sfield.Get()); 3752 interfaces_sfield->SetDexFieldIndex(0); 3753 interfaces_sfield->SetDeclaringClass(klass.Get()); 3754 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3755 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3756 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3757 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3758 CHECK(self->IsExceptionPending()); // OOME. 3759 return nullptr; 3760 } 3761 klass->SetStaticField(1, throws_sfield.Get()); 3762 throws_sfield->SetDexFieldIndex(1); 3763 throws_sfield->SetDeclaringClass(klass.Get()); 3764 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3765 3766 // Proxies have 1 direct method, the constructor 3767 { 3768 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3769 if (UNLIKELY(directs == nullptr)) { 3770 CHECK(self->IsExceptionPending()); // OOME. 3771 return nullptr; 3772 } 3773 klass->SetDirectMethods(directs); 3774 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3775 if (UNLIKELY(constructor == nullptr)) { 3776 CHECK(self->IsExceptionPending()); // OOME. 3777 return nullptr; 3778 } 3779 klass->SetDirectMethod(0, constructor); 3780 } 3781 3782 // Create virtual method using specified prototypes. 3783 size_t num_virtual_methods = 3784 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3785 { 3786 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3787 num_virtual_methods); 3788 if (UNLIKELY(virtuals == nullptr)) { 3789 CHECK(self->IsExceptionPending()); // OOME. 3790 return nullptr; 3791 } 3792 klass->SetVirtualMethods(virtuals); 3793 } 3794 for (size_t i = 0; i < num_virtual_methods; ++i) { 3795 StackHandleScope<1> hs(self); 3796 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3797 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3798 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3799 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3800 if (UNLIKELY(clone == nullptr)) { 3801 CHECK(self->IsExceptionPending()); // OOME. 3802 return nullptr; 3803 } 3804 klass->SetVirtualMethod(i, clone); 3805 } 3806 3807 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3808 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3809 self->AssertNoPendingException(); 3810 3811 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3812 mirror::Class* new_class = nullptr; 3813 { 3814 // Must hold lock on object when resolved. 3815 ObjectLock<mirror::Class> resolution_lock(self, klass); 3816 // Link the fields and virtual methods, creating vtable and iftables 3817 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3818 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3819 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3820 klass->SetStatus(mirror::Class::kStatusError, self); 3821 return nullptr; 3822 } 3823 } 3824 3825 CHECK(klass->IsRetired()); 3826 CHECK_NE(klass.Get(), new_class); 3827 klass.Assign(new_class); 3828 3829 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3830 interfaces_sfield->SetObject<false>(klass.Get(), 3831 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3832 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3833 throws_sfield->SetObject<false>(klass.Get(), 3834 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3835 3836 { 3837 // Lock on klass is released. Lock new class object. 3838 ObjectLock<mirror::Class> initialization_lock(self, klass); 3839 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3840 } 3841 3842 // sanity checks 3843 if (kIsDebugBuild) { 3844 CHECK(klass->GetIFields() == nullptr); 3845 CheckProxyConstructor(klass->GetDirectMethod(0)); 3846 for (size_t i = 0; i < num_virtual_methods; ++i) { 3847 StackHandleScope<2> hs(self); 3848 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3849 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3850 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3851 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3852 CheckProxyMethod(virtual_method, prototype); 3853 } 3854 3855 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3856 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3857 decoded_name->ToModifiedUtf8().c_str())); 3858 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3859 3860 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3861 decoded_name->ToModifiedUtf8().c_str())); 3862 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3863 3864 CHECK_EQ(klass.Get()->GetInterfaces(), 3865 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3866 CHECK_EQ(klass.Get()->GetThrows(), 3867 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3868 } 3869 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3870 CHECK(existing == nullptr); 3871 return klass.Get(); 3872} 3873 3874std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3875 DCHECK(proxy_class->IsProxyClass()); 3876 mirror::String* name = proxy_class->GetName(); 3877 DCHECK(name != nullptr); 3878 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3879} 3880 3881mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3882 mirror::ArtMethod* proxy_method) { 3883 DCHECK(proxy_class->IsProxyClass()); 3884 DCHECK(proxy_method->IsProxyMethod()); 3885 // Locate the dex cache of the original interface/Object 3886 mirror::DexCache* dex_cache = nullptr; 3887 { 3888 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3889 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3890 mirror::DexCache* a_dex_cache = GetDexCache(i); 3891 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3892 dex_cache = a_dex_cache; 3893 break; 3894 } 3895 } 3896 } 3897 CHECK(dex_cache != nullptr); 3898 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3899 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3900 CHECK(resolved_method != nullptr); 3901 return resolved_method; 3902} 3903 3904 3905mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3906 Handle<mirror::Class> klass, 3907 mirror::Class* proxy_class) { 3908 // Create constructor for Proxy that must initialize h 3909 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3910 proxy_class->GetDirectMethods(); 3911 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3912 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3913 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 3914 // constructor method. 3915 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 3916 proxy_constructor); 3917 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3918 // code_ too) 3919 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3920 if (constructor == nullptr) { 3921 CHECK(self->IsExceptionPending()); // OOME. 3922 return nullptr; 3923 } 3924 // Make this constructor public and fix the class to be our Proxy version 3925 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3926 constructor->SetDeclaringClass(klass.Get()); 3927 return constructor; 3928} 3929 3930static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3931 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3932 CHECK(constructor->IsConstructor()); 3933 CHECK_STREQ(constructor->GetName(), "<init>"); 3934 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3935 "(Ljava/lang/reflect/InvocationHandler;)V"); 3936 DCHECK(constructor->IsPublic()); 3937} 3938 3939mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3940 Handle<mirror::Class> klass, 3941 Handle<mirror::ArtMethod> prototype) { 3942 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3943 // prototype method 3944 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3945 prototype.Get()); 3946 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3947 // as necessary 3948 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3949 if (UNLIKELY(method == nullptr)) { 3950 CHECK(self->IsExceptionPending()); // OOME. 3951 return nullptr; 3952 } 3953 3954 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3955 // the intersection of throw exceptions as defined in Proxy 3956 method->SetDeclaringClass(klass.Get()); 3957 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3958 3959 // At runtime the method looks like a reference and argument saving method, clone the code 3960 // related parameters from this method. 3961 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3962#if defined(ART_USE_PORTABLE_COMPILER) 3963 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3964#endif 3965 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3966 3967 return method; 3968} 3969 3970static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3971 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3972 // Basic sanity 3973 CHECK(!prototype->IsFinal()); 3974 CHECK(method->IsFinal()); 3975 CHECK(!method->IsAbstract()); 3976 3977 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3978 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3979 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3980 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 3981 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 3982 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3983 3984 MethodHelper mh(method); 3985 MethodHelper mh2(prototype); 3986 CHECK_STREQ(method->GetName(), prototype->GetName()); 3987 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3988 // More complex sanity - via dex cache 3989 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3990} 3991 3992static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3993 bool can_init_parents) 3994 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3995 if (can_init_statics && can_init_parents) { 3996 return true; 3997 } 3998 if (!can_init_statics) { 3999 // Check if there's a class initializer. 4000 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4001 if (clinit != nullptr) { 4002 return false; 4003 } 4004 // Check if there are encoded static values needing initialization. 4005 if (klass->NumStaticFields() != 0) { 4006 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4007 DCHECK(dex_class_def != nullptr); 4008 if (dex_class_def->static_values_off_ != 0) { 4009 return false; 4010 } 4011 } 4012 } 4013 if (!klass->IsInterface() && klass->HasSuperClass()) { 4014 mirror::Class* super_class = klass->GetSuperClass(); 4015 if (!can_init_parents && !super_class->IsInitialized()) { 4016 return false; 4017 } else { 4018 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 4019 return false; 4020 } 4021 } 4022 } 4023 return true; 4024} 4025 4026bool ClassLinker::IsInitialized() const { 4027 return init_done_; 4028} 4029 4030bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 4031 bool can_init_parents) { 4032 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 4033 4034 // Are we already initialized and therefore done? 4035 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 4036 // an initialized class will never change its state. 4037 if (klass->IsInitialized()) { 4038 return true; 4039 } 4040 4041 // Fast fail if initialization requires a full runtime. Not part of the JLS. 4042 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 4043 return false; 4044 } 4045 4046 Thread* self = Thread::Current(); 4047 uint64_t t0; 4048 { 4049 ObjectLock<mirror::Class> lock(self, klass); 4050 4051 // Re-check under the lock in case another thread initialized ahead of us. 4052 if (klass->IsInitialized()) { 4053 return true; 4054 } 4055 4056 // Was the class already found to be erroneous? Done under the lock to match the JLS. 4057 if (klass->IsErroneous()) { 4058 ThrowEarlierClassFailure(klass.Get()); 4059 return false; 4060 } 4061 4062 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 4063 4064 if (!klass->IsVerified()) { 4065 VerifyClass(klass); 4066 if (!klass->IsVerified()) { 4067 // We failed to verify, expect either the klass to be erroneous or verification failed at 4068 // compile time. 4069 if (klass->IsErroneous()) { 4070 CHECK(self->IsExceptionPending()); 4071 } else { 4072 CHECK(Runtime::Current()->IsCompiler()); 4073 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 4074 } 4075 return false; 4076 } else { 4077 self->AssertNoPendingException(); 4078 } 4079 } 4080 4081 // If the class is kStatusInitializing, either this thread is 4082 // initializing higher up the stack or another thread has beat us 4083 // to initializing and we need to wait. Either way, this 4084 // invocation of InitializeClass will not be responsible for 4085 // running <clinit> and will return. 4086 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4087 // Could have got an exception during verification. 4088 if (self->IsExceptionPending()) { 4089 return false; 4090 } 4091 // We caught somebody else in the act; was it us? 4092 if (klass->GetClinitThreadId() == self->GetTid()) { 4093 // Yes. That's fine. Return so we can continue initializing. 4094 return true; 4095 } 4096 // No. That's fine. Wait for another thread to finish initializing. 4097 return WaitForInitializeClass(klass, self, lock); 4098 } 4099 4100 if (!ValidateSuperClassDescriptors(klass)) { 4101 klass->SetStatus(mirror::Class::kStatusError, self); 4102 return false; 4103 } 4104 4105 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 4106 4107 // From here out other threads may observe that we're initializing and so changes of state 4108 // require the a notification. 4109 klass->SetClinitThreadId(self->GetTid()); 4110 klass->SetStatus(mirror::Class::kStatusInitializing, self); 4111 4112 t0 = NanoTime(); 4113 } 4114 4115 // Initialize super classes, must be done while initializing for the JLS. 4116 if (!klass->IsInterface() && klass->HasSuperClass()) { 4117 mirror::Class* super_class = klass->GetSuperClass(); 4118 if (!super_class->IsInitialized()) { 4119 CHECK(!super_class->IsInterface()); 4120 CHECK(can_init_parents); 4121 StackHandleScope<1> hs(self); 4122 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 4123 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 4124 if (!super_initialized) { 4125 // The super class was verified ahead of entering initializing, we should only be here if 4126 // the super class became erroneous due to initialization. 4127 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 4128 << "Super class initialization failed for " 4129 << PrettyDescriptor(handle_scope_super.Get()) 4130 << " that has unexpected status " << handle_scope_super->GetStatus() 4131 << "\nPending exception:\n" 4132 << (self->GetException(nullptr) != nullptr ? self->GetException(nullptr)->Dump() : ""); 4133 ObjectLock<mirror::Class> lock(self, klass); 4134 // Initialization failed because the super-class is erroneous. 4135 klass->SetStatus(mirror::Class::kStatusError, self); 4136 return false; 4137 } 4138 } 4139 } 4140 4141 if (klass->NumStaticFields() > 0) { 4142 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4143 CHECK(dex_class_def != nullptr); 4144 const DexFile& dex_file = klass->GetDexFile(); 4145 StackHandleScope<2> hs(self); 4146 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 4147 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 4148 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 4149 this, *dex_class_def); 4150 if (it.HasNext()) { 4151 CHECK(can_init_statics); 4152 // We reordered the fields, so we need to be able to map the 4153 // field indexes to the right fields. 4154 SafeMap<uint32_t, mirror::ArtField*> field_map; 4155 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 4156 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 4157 if (Runtime::Current()->IsActiveTransaction()) { 4158 it.ReadValueToField<true>(field_map.Get(i)); 4159 } else { 4160 it.ReadValueToField<false>(field_map.Get(i)); 4161 } 4162 } 4163 } 4164 } 4165 4166 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4167 if (clinit != nullptr) { 4168 CHECK(can_init_statics); 4169 JValue result; 4170 clinit->Invoke(self, nullptr, 0, &result, "V"); 4171 } 4172 4173 uint64_t t1 = NanoTime(); 4174 4175 bool success = true; 4176 { 4177 ObjectLock<mirror::Class> lock(self, klass); 4178 4179 if (self->IsExceptionPending()) { 4180 WrapExceptionInInitializer(); 4181 klass->SetStatus(mirror::Class::kStatusError, self); 4182 success = false; 4183 } else { 4184 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 4185 RuntimeStats* thread_stats = self->GetStats(); 4186 ++global_stats->class_init_count; 4187 ++thread_stats->class_init_count; 4188 global_stats->class_init_time_ns += (t1 - t0); 4189 thread_stats->class_init_time_ns += (t1 - t0); 4190 // Set the class as initialized except if failed to initialize static fields. 4191 klass->SetStatus(mirror::Class::kStatusInitialized, self); 4192 if (VLOG_IS_ON(class_linker)) { 4193 std::string temp; 4194 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 4195 klass->GetLocation(); 4196 } 4197 // Opportunistically set static method trampolines to their destination. 4198 FixupStaticTrampolines(klass.Get()); 4199 } 4200 } 4201 return success; 4202} 4203 4204bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 4205 ObjectLock<mirror::Class>& lock) 4206 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4207 while (true) { 4208 self->AssertNoPendingException(); 4209 CHECK(!klass->IsInitialized()); 4210 lock.WaitIgnoringInterrupts(); 4211 4212 // When we wake up, repeat the test for init-in-progress. If 4213 // there's an exception pending (only possible if 4214 // "interruptShouldThrow" was set), bail out. 4215 if (self->IsExceptionPending()) { 4216 WrapExceptionInInitializer(); 4217 klass->SetStatus(mirror::Class::kStatusError, self); 4218 return false; 4219 } 4220 // Spurious wakeup? Go back to waiting. 4221 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4222 continue; 4223 } 4224 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 4225 // Compile time initialization failed. 4226 return false; 4227 } 4228 if (klass->IsErroneous()) { 4229 // The caller wants an exception, but it was thrown in a 4230 // different thread. Synthesize one here. 4231 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 4232 PrettyDescriptor(klass.Get()).c_str()); 4233 return false; 4234 } 4235 if (klass->IsInitialized()) { 4236 return true; 4237 } 4238 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4239 << klass->GetStatus(); 4240 } 4241 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 4242} 4243 4244bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 4245 if (klass->IsInterface()) { 4246 return true; 4247 } 4248 // Begin with the methods local to the superclass. 4249 StackHandleScope<2> hs(Thread::Current()); 4250 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4251 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4252 if (klass->HasSuperClass() && 4253 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4254 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4255 mh.ChangeMethod(klass->GetVTableEntry(i)); 4256 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 4257 if (mh.GetMethod() != super_mh.GetMethod() && 4258 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4259 ThrowLinkageError(klass.Get(), 4260 "Class %s method %s resolves differently in superclass %s", 4261 PrettyDescriptor(klass.Get()).c_str(), 4262 PrettyMethod(mh.GetMethod()).c_str(), 4263 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4264 return false; 4265 } 4266 } 4267 } 4268 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4269 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4270 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4271 for (uint32_t j = 0; j < num_methods; ++j) { 4272 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4273 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4274 if (mh.GetMethod() != super_mh.GetMethod() && 4275 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4276 ThrowLinkageError(klass.Get(), 4277 "Class %s method %s resolves differently in interface %s", 4278 PrettyDescriptor(klass.Get()).c_str(), 4279 PrettyMethod(mh.GetMethod()).c_str(), 4280 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4281 return false; 4282 } 4283 } 4284 } 4285 } 4286 return true; 4287} 4288 4289bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 4290 bool can_init_parents) { 4291 DCHECK(c.Get() != nullptr); 4292 if (c->IsInitialized()) { 4293 EnsurePreverifiedMethods(c); 4294 return true; 4295 } 4296 const bool success = InitializeClass(c, can_init_fields, can_init_parents); 4297 Thread* self = Thread::Current(); 4298 if (!success) { 4299 if (can_init_fields && can_init_parents) { 4300 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4301 } 4302 } else { 4303 self->AssertNoPendingException(); 4304 } 4305 return success; 4306} 4307 4308void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 4309 mirror::Class* c, 4310 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 4311 const byte* class_data = dex_file.GetClassData(dex_class_def); 4312 ClassDataItemIterator it(dex_file, class_data); 4313 StackHandleScope<2> hs(Thread::Current()); 4314 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 4315 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 4316 CHECK(!kMovingFields); 4317 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 4318 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 4319 } 4320} 4321 4322void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4323 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4324 if (fields != nullptr) { 4325 for (int index = 0; index < fields->GetLength(); index ++) { 4326 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4327 fields->Get(index)->SetDeclaringClass(new_class); 4328 } 4329 } 4330 } 4331 4332 fields = new_class->GetSFields(); 4333 if (fields != nullptr) { 4334 for (int index = 0; index < fields->GetLength(); index ++) { 4335 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4336 fields->Get(index)->SetDeclaringClass(new_class); 4337 } 4338 } 4339 } 4340 4341 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4342 if (methods != nullptr) { 4343 for (int index = 0; index < methods->GetLength(); index ++) { 4344 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4345 methods->Get(index)->SetDeclaringClass(new_class); 4346 } 4347 } 4348 } 4349 4350 methods = new_class->GetVirtualMethods(); 4351 if (methods != nullptr) { 4352 for (int index = 0; index < methods->GetLength(); index ++) { 4353 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4354 methods->Get(index)->SetDeclaringClass(new_class); 4355 } 4356 } 4357 } 4358} 4359 4360bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4361 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4362 mirror::Class** new_class) { 4363 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4364 4365 if (!LinkSuperClass(klass)) { 4366 return false; 4367 } 4368 if (!LinkMethods(self, klass, interfaces)) { 4369 return false; 4370 } 4371 if (!LinkInstanceFields(klass)) { 4372 return false; 4373 } 4374 size_t class_size; 4375 if (!LinkStaticFields(klass, &class_size)) { 4376 return false; 4377 } 4378 CreateReferenceInstanceOffsets(klass); 4379 CreateReferenceStaticOffsets(klass); 4380 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4381 4382 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4383 // We don't need to retire this class as it has no embedded tables or it was created the 4384 // correct size during class linker initialization. 4385 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4386 4387 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4388 klass->PopulateEmbeddedImtAndVTable(); 4389 } 4390 4391 // This will notify waiters on klass that saw the not yet resolved 4392 // class in the class_table_ during EnsureResolved. 4393 klass->SetStatus(mirror::Class::kStatusResolved, self); 4394 *new_class = klass.Get(); 4395 } else { 4396 CHECK(!klass->IsResolved()); 4397 // Retire the temporary class and create the correctly sized resolved class. 4398 *new_class = klass->CopyOf(self, class_size); 4399 if (UNLIKELY(*new_class == nullptr)) { 4400 CHECK(self->IsExceptionPending()); // Expect an OOME. 4401 klass->SetStatus(mirror::Class::kStatusError, self); 4402 return false; 4403 } 4404 4405 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4406 StackHandleScope<1> hs(self); 4407 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4408 ObjectLock<mirror::Class> lock(self, new_class_h); 4409 4410 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4411 4412 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4413 CHECK(existing == nullptr || existing == klass.Get()); 4414 4415 // This will notify waiters on temp class that saw the not yet resolved class in the 4416 // class_table_ during EnsureResolved. 4417 klass->SetStatus(mirror::Class::kStatusRetired, self); 4418 4419 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4420 // This will notify waiters on new_class that saw the not yet resolved 4421 // class in the class_table_ during EnsureResolved. 4422 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4423 } 4424 return true; 4425} 4426 4427bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4428 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4429 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4430 uint16_t super_class_idx = class_def.superclass_idx_; 4431 if (super_class_idx != DexFile::kDexNoIndex16) { 4432 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4433 if (super_class == nullptr) { 4434 DCHECK(Thread::Current()->IsExceptionPending()); 4435 return false; 4436 } 4437 // Verify 4438 if (!klass->CanAccess(super_class)) { 4439 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4440 PrettyDescriptor(super_class).c_str(), 4441 PrettyDescriptor(klass.Get()).c_str()); 4442 return false; 4443 } 4444 CHECK(super_class->IsResolved()); 4445 klass->SetSuperClass(super_class); 4446 } 4447 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4448 if (interfaces != nullptr) { 4449 for (size_t i = 0; i < interfaces->Size(); i++) { 4450 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4451 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4452 if (interface == nullptr) { 4453 DCHECK(Thread::Current()->IsExceptionPending()); 4454 return false; 4455 } 4456 // Verify 4457 if (!klass->CanAccess(interface)) { 4458 // TODO: the RI seemed to ignore this in my testing. 4459 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4460 PrettyDescriptor(interface).c_str(), 4461 PrettyDescriptor(klass.Get()).c_str()); 4462 return false; 4463 } 4464 } 4465 } 4466 // Mark the class as loaded. 4467 klass->SetStatus(mirror::Class::kStatusLoaded, nullptr); 4468 return true; 4469} 4470 4471bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4472 CHECK(!klass->IsPrimitive()); 4473 mirror::Class* super = klass->GetSuperClass(); 4474 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4475 if (super != nullptr) { 4476 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4477 return false; 4478 } 4479 return true; 4480 } 4481 if (super == nullptr) { 4482 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4483 PrettyDescriptor(klass.Get()).c_str()); 4484 return false; 4485 } 4486 // Verify 4487 if (super->IsFinal() || super->IsInterface()) { 4488 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4489 PrettyDescriptor(super).c_str(), 4490 PrettyDescriptor(klass.Get()).c_str(), 4491 super->IsFinal() ? "declared final" : "an interface"); 4492 return false; 4493 } 4494 if (!klass->CanAccess(super)) { 4495 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4496 PrettyDescriptor(super).c_str(), 4497 PrettyDescriptor(klass.Get()).c_str()); 4498 return false; 4499 } 4500 4501 // Inherit kAccClassIsFinalizable from the superclass in case this 4502 // class doesn't override finalize. 4503 if (super->IsFinalizable()) { 4504 klass->SetFinalizable(); 4505 } 4506 4507 // Inherit reference flags (if any) from the superclass. 4508 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4509 if (reference_flags != 0) { 4510 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4511 } 4512 // Disallow custom direct subclasses of java.lang.ref.Reference. 4513 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4514 ThrowLinkageError(klass.Get(), 4515 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4516 PrettyDescriptor(klass.Get()).c_str()); 4517 return false; 4518 } 4519 4520 if (kIsDebugBuild) { 4521 // Ensure super classes are fully resolved prior to resolving fields.. 4522 while (super != nullptr) { 4523 CHECK(super->IsResolved()); 4524 super = super->GetSuperClass(); 4525 } 4526 } 4527 return true; 4528} 4529 4530// Populate the class vtable and itable. Compute return type indices. 4531bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4532 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4533 if (klass->IsInterface()) { 4534 // No vtable. 4535 size_t count = klass->NumVirtualMethods(); 4536 if (!IsUint(16, count)) { 4537 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4538 return false; 4539 } 4540 for (size_t i = 0; i < count; ++i) { 4541 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4542 } 4543 // Link interface method tables 4544 return LinkInterfaceMethods(klass, interfaces); 4545 } else { 4546 // Link virtual and interface method tables 4547 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4548 } 4549 return true; 4550} 4551 4552bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4553 if (klass->HasSuperClass()) { 4554 uint32_t max_count = klass->NumVirtualMethods() + 4555 klass->GetSuperClass()->GetVTableLength(); 4556 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4557 CHECK_LE(actual_count, max_count); 4558 StackHandleScope<4> hs(self); 4559 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4560 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4561 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4562 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4563 if (UNLIKELY(vtable.Get() == nullptr)) { 4564 CHECK(self->IsExceptionPending()); // OOME. 4565 return false; 4566 } 4567 int len = super_class->GetVTableLength(); 4568 for (int i = 0; i < len; i++) { 4569 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4570 } 4571 } else { 4572 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4573 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4574 if (UNLIKELY(vtable.Get() == nullptr)) { 4575 CHECK(self->IsExceptionPending()); // OOME. 4576 return false; 4577 } 4578 } 4579 4580 // See if any of our virtual methods override the superclass. 4581 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4582 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4583 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4584 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4585 local_mh.ChangeMethod(local_method); 4586 size_t j = 0; 4587 for (; j < actual_count; ++j) { 4588 mirror::ArtMethod* super_method = vtable->Get(j); 4589 super_mh.ChangeMethod(super_method); 4590 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4591 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4592 super_method->GetAccessFlags())) { 4593 if (super_method->IsFinal()) { 4594 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4595 PrettyMethod(local_method).c_str(), 4596 super_method->GetDeclaringClassDescriptor()); 4597 return false; 4598 } 4599 vtable->Set<false>(j, local_method); 4600 local_method->SetMethodIndex(j); 4601 break; 4602 } else { 4603 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4604 << " would have incorrectly overridden the package-private method in " 4605 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4606 } 4607 } 4608 } 4609 if (j == actual_count) { 4610 // Not overriding, append. 4611 vtable->Set<false>(actual_count, local_method); 4612 local_method->SetMethodIndex(actual_count); 4613 actual_count += 1; 4614 } 4615 } 4616 if (!IsUint(16, actual_count)) { 4617 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4618 return false; 4619 } 4620 // Shrink vtable if possible 4621 CHECK_LE(actual_count, max_count); 4622 if (actual_count < max_count) { 4623 vtable.Assign(vtable->CopyOf(self, actual_count)); 4624 if (UNLIKELY(vtable.Get() == nullptr)) { 4625 CHECK(self->IsExceptionPending()); // OOME. 4626 return false; 4627 } 4628 } 4629 klass->SetVTable(vtable.Get()); 4630 } else { 4631 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4632 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4633 if (!IsUint(16, num_virtual_methods)) { 4634 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4635 return false; 4636 } 4637 StackHandleScope<1> hs(self); 4638 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4639 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4640 if (UNLIKELY(vtable.Get() == nullptr)) { 4641 CHECK(self->IsExceptionPending()); // OOME. 4642 return false; 4643 } 4644 for (size_t i = 0; i < num_virtual_methods; ++i) { 4645 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4646 vtable->Set<false>(i, virtual_method); 4647 virtual_method->SetMethodIndex(i & 0xFFFF); 4648 } 4649 klass->SetVTable(vtable.Get()); 4650 } 4651 return true; 4652} 4653 4654bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 4655 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4656 Thread* const self = Thread::Current(); 4657 Runtime* const runtime = Runtime::Current(); 4658 // Set the imt table to be all conflicts by default. 4659 klass->SetImTable(runtime->GetDefaultImt()); 4660 size_t super_ifcount; 4661 if (klass->HasSuperClass()) { 4662 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4663 } else { 4664 super_ifcount = 0; 4665 } 4666 uint32_t num_interfaces = 4667 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4668 size_t ifcount = super_ifcount + num_interfaces; 4669 for (size_t i = 0; i < num_interfaces; i++) { 4670 mirror::Class* interface = 4671 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4672 interfaces->Get(i); 4673 ifcount += interface->GetIfTableCount(); 4674 } 4675 if (ifcount == 0) { 4676 // Class implements no interfaces. 4677 DCHECK_EQ(klass->GetIfTableCount(), 0); 4678 DCHECK(klass->GetIfTable() == nullptr); 4679 return true; 4680 } 4681 if (ifcount == super_ifcount) { 4682 // Class implements same interfaces as parent, are any of these not marker interfaces? 4683 bool has_non_marker_interface = false; 4684 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4685 for (size_t i = 0; i < ifcount; ++i) { 4686 if (super_iftable->GetMethodArrayCount(i) > 0) { 4687 has_non_marker_interface = true; 4688 break; 4689 } 4690 } 4691 if (!has_non_marker_interface) { 4692 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4693 klass->SetIfTable(super_iftable); 4694 return true; 4695 } 4696 } 4697 StackHandleScope<4> hs(self); 4698 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4699 if (UNLIKELY(iftable.Get() == nullptr)) { 4700 CHECK(self->IsExceptionPending()); // OOME. 4701 return false; 4702 } 4703 if (super_ifcount != 0) { 4704 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4705 for (size_t i = 0; i < super_ifcount; i++) { 4706 mirror::Class* super_interface = super_iftable->GetInterface(i); 4707 iftable->SetInterface(i, super_interface); 4708 } 4709 } 4710 // Flatten the interface inheritance hierarchy. 4711 size_t idx = super_ifcount; 4712 for (size_t i = 0; i < num_interfaces; i++) { 4713 mirror::Class* interface = 4714 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4715 interfaces->Get(i); 4716 DCHECK(interface != nullptr); 4717 if (!interface->IsInterface()) { 4718 std::string temp; 4719 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4720 PrettyDescriptor(klass.Get()).c_str(), 4721 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4722 return false; 4723 } 4724 // Check if interface is already in iftable 4725 bool duplicate = false; 4726 for (size_t j = 0; j < idx; j++) { 4727 mirror::Class* existing_interface = iftable->GetInterface(j); 4728 if (existing_interface == interface) { 4729 duplicate = true; 4730 break; 4731 } 4732 } 4733 if (!duplicate) { 4734 // Add this non-duplicate interface. 4735 iftable->SetInterface(idx++, interface); 4736 // Add this interface's non-duplicate super-interfaces. 4737 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4738 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4739 bool super_duplicate = false; 4740 for (size_t k = 0; k < idx; k++) { 4741 mirror::Class* existing_interface = iftable->GetInterface(k); 4742 if (existing_interface == super_interface) { 4743 super_duplicate = true; 4744 break; 4745 } 4746 } 4747 if (!super_duplicate) { 4748 iftable->SetInterface(idx++, super_interface); 4749 } 4750 } 4751 } 4752 } 4753 // Shrink iftable in case duplicates were found 4754 if (idx < ifcount) { 4755 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4756 if (UNLIKELY(iftable.Get() == nullptr)) { 4757 CHECK(self->IsExceptionPending()); // OOME. 4758 return false; 4759 } 4760 ifcount = idx; 4761 } else { 4762 CHECK_EQ(idx, ifcount); 4763 } 4764 klass->SetIfTable(iftable.Get()); 4765 4766 // If we're an interface, we don't need the vtable pointers, so we're done. 4767 if (klass->IsInterface()) { 4768 return true; 4769 } 4770 // Allocate imtable 4771 bool imtable_changed = false; 4772 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4773 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4774 if (UNLIKELY(imtable.Get() == nullptr)) { 4775 CHECK(self->IsExceptionPending()); // OOME. 4776 return false; 4777 } 4778 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4779 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4780 std::vector<mirror::ArtMethod*> miranda_list; 4781 for (size_t i = 0; i < ifcount; ++i) { 4782 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4783 if (num_methods > 0) { 4784 StackHandleScope<2> hs(self); 4785 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4786 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4787 if (UNLIKELY(method_array.Get() == nullptr)) { 4788 CHECK(self->IsExceptionPending()); // OOME. 4789 return false; 4790 } 4791 iftable->SetMethodArray(i, method_array.Get()); 4792 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4793 hs.NewHandle(klass->GetVTableDuringLinking())); 4794 for (size_t j = 0; j < num_methods; ++j) { 4795 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 4796 interface_mh.ChangeMethod(interface_method); 4797 int32_t k; 4798 // For each method listed in the interface's method list, find the 4799 // matching method in our class's method list. We want to favor the 4800 // subclass over the superclass, which just requires walking 4801 // back from the end of the vtable. (This only matters if the 4802 // superclass defines a private method and this class redefines 4803 // it -- otherwise it would use the same vtable slot. In .dex files 4804 // those don't end up in the virtual method table, so it shouldn't 4805 // matter which direction we go. We walk it backward anyway.) 4806 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4807 mirror::ArtMethod* vtable_method = vtable->Get(k); 4808 vtable_mh.ChangeMethod(vtable_method); 4809 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4810 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 4811 ThrowIllegalAccessError( 4812 klass.Get(), 4813 "Method '%s' implementing interface method '%s' is not public", 4814 PrettyMethod(vtable_method).c_str(), 4815 PrettyMethod(interface_method).c_str()); 4816 return false; 4817 } 4818 method_array->Set<false>(j, vtable_method); 4819 // Place method in imt if entry is empty, place conflict otherwise. 4820 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4821 if (imtable->Get(imt_index) == nullptr) { 4822 imtable->Set<false>(imt_index, vtable_method); 4823 imtable_changed = true; 4824 } else { 4825 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4826 } 4827 break; 4828 } 4829 } 4830 if (k < 0) { 4831 StackHandleScope<1> hs(self); 4832 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4833 for (mirror::ArtMethod* mir_method : miranda_list) { 4834 vtable_mh.ChangeMethod(mir_method); 4835 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4836 miranda_method.Assign(mir_method); 4837 break; 4838 } 4839 } 4840 if (miranda_method.Get() == nullptr) { 4841 // Point the interface table at a phantom slot. 4842 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 4843 if (UNLIKELY(miranda_method.Get() == nullptr)) { 4844 CHECK(self->IsExceptionPending()); // OOME. 4845 return false; 4846 } 4847 // TODO: If a methods move then the miranda_list may hold stale references. 4848 miranda_list.push_back(miranda_method.Get()); 4849 } 4850 method_array->Set<false>(j, miranda_method.Get()); 4851 } 4852 } 4853 } 4854 } 4855 if (imtable_changed) { 4856 // Fill in empty entries in interface method table with conflict. 4857 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4858 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4859 if (imtable->Get(i) == nullptr) { 4860 imtable->Set<false>(i, imt_conflict_method); 4861 } 4862 } 4863 klass->SetImTable(imtable.Get()); 4864 } 4865 if (!miranda_list.empty()) { 4866 int old_method_count = klass->NumVirtualMethods(); 4867 int new_method_count = old_method_count + miranda_list.size(); 4868 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4869 if (old_method_count == 0) { 4870 virtuals = AllocArtMethodArray(self, new_method_count); 4871 } else { 4872 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4873 } 4874 if (UNLIKELY(virtuals == nullptr)) { 4875 CHECK(self->IsExceptionPending()); // OOME. 4876 return false; 4877 } 4878 klass->SetVirtualMethods(virtuals); 4879 4880 StackHandleScope<1> hs(self); 4881 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4882 hs.NewHandle(klass->GetVTableDuringLinking())); 4883 CHECK(vtable.Get() != nullptr); 4884 int old_vtable_count = vtable->GetLength(); 4885 int new_vtable_count = old_vtable_count + miranda_list.size(); 4886 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4887 if (UNLIKELY(vtable.Get() == nullptr)) { 4888 CHECK(self->IsExceptionPending()); // OOME. 4889 return false; 4890 } 4891 for (size_t i = 0; i < miranda_list.size(); ++i) { 4892 mirror::ArtMethod* method = miranda_list[i]; 4893 // Leave the declaring class alone as type indices are relative to it 4894 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4895 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4896 klass->SetVirtualMethod(old_method_count + i, method); 4897 vtable->Set<false>(old_vtable_count + i, method); 4898 } 4899 // TODO: do not assign to the vtable field until it is fully constructed. 4900 klass->SetVTable(vtable.Get()); 4901 } 4902 4903 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4904 for (int i = 0; i < vtable->GetLength(); ++i) { 4905 CHECK(vtable->Get(i) != nullptr); 4906 } 4907 4908// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4909 4910 return true; 4911} 4912 4913bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4914 CHECK(klass.Get() != nullptr); 4915 return LinkFields(klass, false, nullptr); 4916} 4917 4918bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass, size_t* class_size) { 4919 CHECK(klass.Get() != nullptr); 4920 return LinkFields(klass, true, class_size); 4921} 4922 4923struct LinkFieldsComparator { 4924 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4925 } 4926 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4927 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4928 NO_THREAD_SAFETY_ANALYSIS { 4929 // First come reference fields, then 64-bit, and finally 32-bit 4930 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4931 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4932 if (type1 != type2) { 4933 bool is_primitive1 = type1 != Primitive::kPrimNot; 4934 bool is_primitive2 = type2 != Primitive::kPrimNot; 4935 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4936 type1 == Primitive::kPrimDouble); 4937 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4938 type2 == Primitive::kPrimDouble); 4939 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4940 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4941 if (order1 != order2) { 4942 return order1 < order2; 4943 } 4944 } 4945 // same basic group? then sort by string. 4946 return strcmp(field1->GetName(), field2->GetName()) < 0; 4947 } 4948}; 4949 4950bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static, size_t* class_size) { 4951 size_t num_fields = 4952 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4953 4954 mirror::ObjectArray<mirror::ArtField>* fields = 4955 is_static ? klass->GetSFields() : klass->GetIFields(); 4956 4957 // Initialize field_offset 4958 MemberOffset field_offset(0); 4959 if (is_static) { 4960 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 4961 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4962 // Static fields come after the embedded tables. 4963 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 4964 0, 0, 0); 4965 } 4966 field_offset = MemberOffset(base); 4967 } else { 4968 mirror::Class* super_class = klass->GetSuperClass(); 4969 if (super_class != nullptr) { 4970 CHECK(super_class->IsResolved()) 4971 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4972 field_offset = MemberOffset(super_class->GetObjectSize()); 4973 } 4974 } 4975 4976 CHECK_EQ(num_fields == 0, fields == nullptr) << PrettyClass(klass.Get()); 4977 4978 // we want a relatively stable order so that adding new fields 4979 // minimizes disruption of C++ version such as Class and Method. 4980 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4981 for (size_t i = 0; i < num_fields; i++) { 4982 mirror::ArtField* f = fields->Get(i); 4983 CHECK(f != nullptr) << PrettyClass(klass.Get()); 4984 grouped_and_sorted_fields.push_back(f); 4985 } 4986 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4987 LinkFieldsComparator()); 4988 4989 // References should be at the front. 4990 size_t current_field = 0; 4991 size_t num_reference_fields = 0; 4992 for (; current_field < num_fields; current_field++) { 4993 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4994 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4995 bool isPrimitive = type != Primitive::kPrimNot; 4996 if (isPrimitive) { 4997 break; // past last reference, move on to the next phase 4998 } 4999 grouped_and_sorted_fields.pop_front(); 5000 num_reference_fields++; 5001 fields->Set<false>(current_field, field); 5002 field->SetOffset(field_offset); 5003 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 5004 } 5005 5006 // Now we want to pack all of the double-wide fields together. If 5007 // we're not aligned, though, we want to shuffle one 32-bit field 5008 // into place. If we can't find one, we'll have to pad it. 5009 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 5010 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 5011 mirror::ArtField* field = grouped_and_sorted_fields[i]; 5012 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5013 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 5014 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 5015 continue; 5016 } 5017 fields->Set<false>(current_field++, field); 5018 field->SetOffset(field_offset); 5019 // drop the consumed field 5020 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 5021 break; 5022 } 5023 // whether we found a 32-bit field for padding or not, we advance 5024 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 5025 } 5026 5027 // Alignment is good, shuffle any double-wide fields forward, and 5028 // finish assigning field offsets to all fields. 5029 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 5030 << PrettyClass(klass.Get()); 5031 while (!grouped_and_sorted_fields.empty()) { 5032 mirror::ArtField* field = grouped_and_sorted_fields.front(); 5033 grouped_and_sorted_fields.pop_front(); 5034 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5035 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 5036 fields->Set<false>(current_field, field); 5037 field->SetOffset(field_offset); 5038 field_offset = MemberOffset(field_offset.Uint32Value() + 5039 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 5040 ? sizeof(uint64_t) 5041 : sizeof(uint32_t))); 5042 current_field++; 5043 } 5044 5045 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 5046 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 5047 // We know there are no non-reference fields in the Reference classes, and we know 5048 // that 'referent' is alphabetically last, so this is easy... 5049 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 5050 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 5051 --num_reference_fields; 5052 } 5053 5054 if (kIsDebugBuild) { 5055 // Make sure that all reference fields appear before 5056 // non-reference fields, and all double-wide fields are aligned. 5057 bool seen_non_ref = false; 5058 for (size_t i = 0; i < num_fields; i++) { 5059 mirror::ArtField* field = fields->Get(i); 5060 if (false) { // enable to debug field layout 5061 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 5062 << " class=" << PrettyClass(klass.Get()) 5063 << " field=" << PrettyField(field) 5064 << " offset=" 5065 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 5066 } 5067 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5068 bool is_primitive = type != Primitive::kPrimNot; 5069 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 5070 strcmp("referent", field->GetName()) == 0) { 5071 is_primitive = true; // We lied above, so we have to expect a lie here. 5072 } 5073 if (is_primitive) { 5074 if (!seen_non_ref) { 5075 seen_non_ref = true; 5076 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 5077 } 5078 } else { 5079 DCHECK(!seen_non_ref) << PrettyField(field); 5080 } 5081 } 5082 if (!seen_non_ref) { 5083 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 5084 } 5085 } 5086 5087 size_t size = field_offset.Uint32Value(); 5088 // Update klass 5089 if (is_static) { 5090 klass->SetNumReferenceStaticFields(num_reference_fields); 5091 *class_size = size; 5092 } else { 5093 klass->SetNumReferenceInstanceFields(num_reference_fields); 5094 if (!klass->IsVariableSize()) { 5095 std::string temp; 5096 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 5097 size_t previous_size = klass->GetObjectSize(); 5098 if (previous_size != 0) { 5099 // Make sure that we didn't originally have an incorrect size. 5100 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 5101 } 5102 klass->SetObjectSize(size); 5103 } 5104 } 5105 return true; 5106} 5107 5108// Set the bitmap of reference offsets, refOffsets, from the ifields 5109// list. 5110void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 5111 uint32_t reference_offsets = 0; 5112 mirror::Class* super_class = klass->GetSuperClass(); 5113 if (super_class != nullptr) { 5114 reference_offsets = super_class->GetReferenceInstanceOffsets(); 5115 // If our superclass overflowed, we don't stand a chance. 5116 if (reference_offsets == CLASS_WALK_SUPER) { 5117 klass->SetReferenceInstanceOffsets(reference_offsets); 5118 return; 5119 } 5120 } 5121 CreateReferenceOffsets(klass, false, reference_offsets); 5122} 5123 5124void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 5125 CreateReferenceOffsets(klass, true, 0); 5126} 5127 5128void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 5129 uint32_t reference_offsets) { 5130 size_t num_reference_fields = 5131 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 5132 : klass->NumReferenceInstanceFieldsDuringLinking(); 5133 mirror::ObjectArray<mirror::ArtField>* fields = 5134 is_static ? klass->GetSFields() : klass->GetIFields(); 5135 // All of the fields that contain object references are guaranteed 5136 // to be at the beginning of the fields list. 5137 for (size_t i = 0; i < num_reference_fields; ++i) { 5138 // Note that byte_offset is the offset from the beginning of 5139 // object, not the offset into instance data 5140 mirror::ArtField* field = fields->Get(i); 5141 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 5142 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 5143 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 5144 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 5145 CHECK_NE(new_bit, 0U); 5146 reference_offsets |= new_bit; 5147 } else { 5148 reference_offsets = CLASS_WALK_SUPER; 5149 break; 5150 } 5151 } 5152 // Update fields in klass 5153 if (is_static) { 5154 klass->SetReferenceStaticOffsets(reference_offsets); 5155 } else { 5156 klass->SetReferenceInstanceOffsets(reference_offsets); 5157 } 5158} 5159 5160mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 5161 Handle<mirror::DexCache> dex_cache) { 5162 DCHECK(dex_cache.Get() != nullptr); 5163 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 5164 if (resolved != nullptr) { 5165 return resolved; 5166 } 5167 uint32_t utf16_length; 5168 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 5169 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 5170 dex_cache->SetResolvedString(string_idx, string); 5171 return string; 5172} 5173 5174mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5175 mirror::Class* referrer) { 5176 StackHandleScope<2> hs(Thread::Current()); 5177 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 5178 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 5179 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 5180} 5181 5182mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5183 Handle<mirror::DexCache> dex_cache, 5184 Handle<mirror::ClassLoader> class_loader) { 5185 DCHECK(dex_cache.Get() != nullptr); 5186 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 5187 if (resolved == nullptr) { 5188 Thread* self = Thread::Current(); 5189 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 5190 resolved = FindClass(self, descriptor, class_loader); 5191 if (resolved != nullptr) { 5192 // TODO: we used to throw here if resolved's class loader was not the 5193 // boot class loader. This was to permit different classes with the 5194 // same name to be loaded simultaneously by different loaders 5195 dex_cache->SetResolvedType(type_idx, resolved); 5196 } else { 5197 CHECK(self->IsExceptionPending()) 5198 << "Expected pending exception for failed resolution of: " << descriptor; 5199 // Convert a ClassNotFoundException to a NoClassDefFoundError. 5200 StackHandleScope<1> hs(self); 5201 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 5202 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 5203 DCHECK(resolved == nullptr); // No Handle needed to preserve resolved. 5204 self->ClearException(); 5205 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 5206 self->GetException(nullptr)->SetCause(cause.Get()); 5207 } 5208 } 5209 } 5210 DCHECK((resolved == nullptr) || resolved->IsResolved() || resolved->IsErroneous()) 5211 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 5212 return resolved; 5213} 5214 5215mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 5216 Handle<mirror::DexCache> dex_cache, 5217 Handle<mirror::ClassLoader> class_loader, 5218 Handle<mirror::ArtMethod> referrer, 5219 InvokeType type) { 5220 DCHECK(dex_cache.Get() != nullptr); 5221 // Check for hit in the dex cache. 5222 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 5223 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 5224 return resolved; 5225 } 5226 // Fail, get the declaring class. 5227 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5228 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 5229 if (klass == nullptr) { 5230 DCHECK(Thread::Current()->IsExceptionPending()); 5231 return nullptr; 5232 } 5233 // Scan using method_idx, this saves string compares but will only hit for matching dex 5234 // caches/files. 5235 switch (type) { 5236 case kDirect: // Fall-through. 5237 case kStatic: 5238 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5239 break; 5240 case kInterface: 5241 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5242 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5243 break; 5244 case kSuper: // Fall-through. 5245 case kVirtual: 5246 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5247 break; 5248 default: 5249 LOG(FATAL) << "Unreachable - invocation type: " << type; 5250 } 5251 if (resolved == nullptr) { 5252 // Search by name, which works across dex files. 5253 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5254 const Signature signature = dex_file.GetMethodSignature(method_id); 5255 switch (type) { 5256 case kDirect: // Fall-through. 5257 case kStatic: 5258 resolved = klass->FindDirectMethod(name, signature); 5259 break; 5260 case kInterface: 5261 resolved = klass->FindInterfaceMethod(name, signature); 5262 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5263 break; 5264 case kSuper: // Fall-through. 5265 case kVirtual: 5266 resolved = klass->FindVirtualMethod(name, signature); 5267 break; 5268 } 5269 } 5270 // If we found a method, check for incompatible class changes. 5271 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5272 // Be a good citizen and update the dex cache to speed subsequent calls. 5273 dex_cache->SetResolvedMethod(method_idx, resolved); 5274 return resolved; 5275 } else { 5276 // If we had a method, it's an incompatible-class-change error. 5277 if (resolved != nullptr) { 5278 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5279 } else { 5280 // We failed to find the method which means either an access error, an incompatible class 5281 // change, or no such method. First try to find the method among direct and virtual methods. 5282 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5283 const Signature signature = dex_file.GetMethodSignature(method_id); 5284 switch (type) { 5285 case kDirect: 5286 case kStatic: 5287 resolved = klass->FindVirtualMethod(name, signature); 5288 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5289 // have had a resolved method before, which triggers the "true" branch above. 5290 break; 5291 case kInterface: 5292 case kVirtual: 5293 case kSuper: 5294 resolved = klass->FindDirectMethod(name, signature); 5295 break; 5296 } 5297 5298 // If we found something, check that it can be accessed by the referrer. 5299 if (resolved != nullptr && referrer.Get() != nullptr) { 5300 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5301 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5302 if (!referring_class->CanAccess(methods_class)) { 5303 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5304 resolved, type); 5305 return nullptr; 5306 } else if (!referring_class->CanAccessMember(methods_class, 5307 resolved->GetAccessFlags())) { 5308 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5309 return nullptr; 5310 } 5311 } 5312 5313 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 5314 // methods and throw if we find the method there. If we find nothing, throw a 5315 // NoSuchMethodError. 5316 switch (type) { 5317 case kDirect: 5318 case kStatic: 5319 if (resolved != nullptr) { 5320 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5321 } else { 5322 resolved = klass->FindInterfaceMethod(name, signature); 5323 if (resolved != nullptr) { 5324 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5325 } else { 5326 ThrowNoSuchMethodError(type, klass, name, signature); 5327 } 5328 } 5329 break; 5330 case kInterface: 5331 if (resolved != nullptr) { 5332 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5333 } else { 5334 resolved = klass->FindVirtualMethod(name, signature); 5335 if (resolved != nullptr) { 5336 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5337 } else { 5338 ThrowNoSuchMethodError(type, klass, name, signature); 5339 } 5340 } 5341 break; 5342 case kSuper: 5343 if (resolved != nullptr) { 5344 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5345 } else { 5346 ThrowNoSuchMethodError(type, klass, name, signature); 5347 } 5348 break; 5349 case kVirtual: 5350 if (resolved != nullptr) { 5351 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5352 } else { 5353 resolved = klass->FindInterfaceMethod(name, signature); 5354 if (resolved != nullptr) { 5355 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5356 } else { 5357 ThrowNoSuchMethodError(type, klass, name, signature); 5358 } 5359 } 5360 break; 5361 } 5362 } 5363 DCHECK(Thread::Current()->IsExceptionPending()); 5364 return nullptr; 5365 } 5366} 5367 5368mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5369 Handle<mirror::DexCache> dex_cache, 5370 Handle<mirror::ClassLoader> class_loader, 5371 bool is_static) { 5372 DCHECK(dex_cache.Get() != nullptr); 5373 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5374 if (resolved != nullptr) { 5375 return resolved; 5376 } 5377 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5378 Thread* const self = Thread::Current(); 5379 StackHandleScope<1> hs(self); 5380 Handle<mirror::Class> klass( 5381 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5382 if (klass.Get() == nullptr) { 5383 DCHECK(Thread::Current()->IsExceptionPending()); 5384 return nullptr; 5385 } 5386 5387 if (is_static) { 5388 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5389 } else { 5390 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5391 } 5392 5393 if (resolved == nullptr) { 5394 const char* name = dex_file.GetFieldName(field_id); 5395 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5396 if (is_static) { 5397 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5398 } else { 5399 resolved = klass->FindInstanceField(name, type); 5400 } 5401 if (resolved == nullptr) { 5402 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5403 return nullptr; 5404 } 5405 } 5406 dex_cache->SetResolvedField(field_idx, resolved); 5407 return resolved; 5408} 5409 5410mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5411 uint32_t field_idx, 5412 Handle<mirror::DexCache> dex_cache, 5413 Handle<mirror::ClassLoader> class_loader) { 5414 DCHECK(dex_cache.Get() != nullptr); 5415 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5416 if (resolved != nullptr) { 5417 return resolved; 5418 } 5419 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5420 Thread* self = Thread::Current(); 5421 StackHandleScope<1> hs(self); 5422 Handle<mirror::Class> klass( 5423 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5424 if (klass.Get() == nullptr) { 5425 DCHECK(Thread::Current()->IsExceptionPending()); 5426 return nullptr; 5427 } 5428 5429 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5430 StringPiece type(dex_file.StringDataByIdx( 5431 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5432 resolved = mirror::Class::FindField(self, klass, name, type); 5433 if (resolved != nullptr) { 5434 dex_cache->SetResolvedField(field_idx, resolved); 5435 } else { 5436 ThrowNoSuchFieldError("", klass.Get(), type, name); 5437 } 5438 return resolved; 5439} 5440 5441const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5442 uint32_t* length) { 5443 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5444 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5445 const DexFile& dex_file = *dex_cache->GetDexFile(); 5446 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5447 return dex_file.GetMethodShorty(method_id, length); 5448} 5449 5450void ClassLinker::DumpAllClasses(int flags) { 5451 if (dex_cache_image_class_lookup_required_) { 5452 MoveImageClassesToClassTable(); 5453 } 5454 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5455 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5456 std::vector<mirror::Class*> all_classes; 5457 { 5458 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5459 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5460 mirror::Class* klass = it.second.Read(); 5461 all_classes.push_back(klass); 5462 } 5463 } 5464 5465 for (size_t i = 0; i < all_classes.size(); ++i) { 5466 all_classes[i]->DumpClass(std::cerr, flags); 5467 } 5468} 5469 5470void ClassLinker::DumpForSigQuit(std::ostream& os) { 5471 if (dex_cache_image_class_lookup_required_) { 5472 MoveImageClassesToClassTable(); 5473 } 5474 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5475 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5476} 5477 5478size_t ClassLinker::NumLoadedClasses() { 5479 if (dex_cache_image_class_lookup_required_) { 5480 MoveImageClassesToClassTable(); 5481 } 5482 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5483 return class_table_.size(); 5484} 5485 5486pid_t ClassLinker::GetClassesLockOwner() { 5487 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5488} 5489 5490pid_t ClassLinker::GetDexLockOwner() { 5491 return dex_lock_.GetExclusiveOwnerTid(); 5492} 5493 5494void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5495 DCHECK(!init_done_); 5496 5497 DCHECK(klass != nullptr); 5498 DCHECK(klass->GetClassLoader() == nullptr); 5499 5500 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5501 DCHECK(class_roots != nullptr); 5502 DCHECK(class_roots->Get(class_root) == nullptr); 5503 class_roots->Set<false>(class_root, klass); 5504} 5505 5506} // namespace art 5507