class_linker.cc revision 3892cf8da7d5e76c0dee585fc8f69df773680525
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <fcntl.h> 20#include <sys/file.h> 21#include <sys/stat.h> 22#include <deque> 23#include <memory> 24#include <string> 25#include <utility> 26#include <vector> 27 28#include "base/casts.h" 29#include "base/logging.h" 30#include "base/scoped_flock.h" 31#include "base/stl_util.h" 32#include "base/unix_file/fd_file.h" 33#include "class_linker-inl.h" 34#include "compiler_callbacks.h" 35#include "debugger.h" 36#include "dex_file-inl.h" 37#include "gc_root-inl.h" 38#include "gc/accounting/card_table-inl.h" 39#include "gc/accounting/heap_bitmap.h" 40#include "gc/heap.h" 41#include "gc/space/image_space.h" 42#include "handle_scope.h" 43#include "intern_table.h" 44#include "interpreter/interpreter.h" 45#include "leb128.h" 46#include "method_helper-inl.h" 47#include "oat.h" 48#include "oat_file.h" 49#include "object_lock.h" 50#include "mirror/art_field-inl.h" 51#include "mirror/art_method-inl.h" 52#include "mirror/class.h" 53#include "mirror/class-inl.h" 54#include "mirror/class_loader.h" 55#include "mirror/dex_cache-inl.h" 56#include "mirror/iftable-inl.h" 57#include "mirror/object-inl.h" 58#include "mirror/object_array-inl.h" 59#include "mirror/proxy.h" 60#include "mirror/reference-inl.h" 61#include "mirror/stack_trace_element.h" 62#include "mirror/string-inl.h" 63#include "os.h" 64#include "runtime.h" 65#include "entrypoints/entrypoint_utils.h" 66#include "ScopedLocalRef.h" 67#include "scoped_thread_state_change.h" 68#include "handle_scope-inl.h" 69#include "thread.h" 70#include "utils.h" 71#include "verifier/method_verifier.h" 72#include "well_known_classes.h" 73 74namespace art { 75 76static void ThrowNoClassDefFoundError(const char* fmt, ...) 77 __attribute__((__format__(__printf__, 1, 2))) 78 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 79static void ThrowNoClassDefFoundError(const char* fmt, ...) { 80 va_list args; 81 va_start(args, fmt); 82 Thread* self = Thread::Current(); 83 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 84 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 85 va_end(args); 86} 87 88static void ThrowEarlierClassFailure(mirror::Class* c) 89 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 90 // The class failed to initialize on a previous attempt, so we want to throw 91 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 92 // failed in verification, in which case v2 5.4.1 says we need to re-throw 93 // the previous error. 94 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 95 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 96 } 97 98 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 99 Thread* self = Thread::Current(); 100 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 101 if (c->GetVerifyErrorClass() != NULL) { 102 // TODO: change the verifier to store an _instance_, with a useful detail message? 103 std::string temp; 104 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 105 PrettyDescriptor(c).c_str()); 106 } else { 107 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 108 PrettyDescriptor(c).c_str()); 109 } 110} 111 112static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 113 Thread* self = Thread::Current(); 114 JNIEnv* env = self->GetJniEnv(); 115 116 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 117 CHECK(cause.get() != NULL); 118 119 env->ExceptionClear(); 120 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 121 env->Throw(cause.get()); 122 123 // We only wrap non-Error exceptions; an Error can just be used as-is. 124 if (!is_error) { 125 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 126 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 127 } 128} 129 130static size_t Hash(const char* s) { 131 // This is the java.lang.String hashcode for convenience, not interoperability. 132 size_t hash = 0; 133 for (; *s != '\0'; ++s) { 134 hash = hash * 31 + *s; 135 } 136 return hash; 137} 138 139const char* ClassLinker::class_roots_descriptors_[] = { 140 "Ljava/lang/Class;", 141 "Ljava/lang/Object;", 142 "[Ljava/lang/Class;", 143 "[Ljava/lang/Object;", 144 "Ljava/lang/String;", 145 "Ljava/lang/DexCache;", 146 "Ljava/lang/ref/Reference;", 147 "Ljava/lang/reflect/ArtField;", 148 "Ljava/lang/reflect/ArtMethod;", 149 "Ljava/lang/reflect/Proxy;", 150 "[Ljava/lang/String;", 151 "[Ljava/lang/reflect/ArtField;", 152 "[Ljava/lang/reflect/ArtMethod;", 153 "Ljava/lang/ClassLoader;", 154 "Ljava/lang/Throwable;", 155 "Ljava/lang/ClassNotFoundException;", 156 "Ljava/lang/StackTraceElement;", 157 "Z", 158 "B", 159 "C", 160 "D", 161 "F", 162 "I", 163 "J", 164 "S", 165 "V", 166 "[Z", 167 "[B", 168 "[C", 169 "[D", 170 "[F", 171 "[I", 172 "[J", 173 "[S", 174 "[Ljava/lang/StackTraceElement;", 175}; 176 177ClassLinker::ClassLinker(InternTable* intern_table) 178 // dex_lock_ is recursive as it may be used in stack dumping. 179 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 180 dex_cache_image_class_lookup_required_(false), 181 failed_dex_cache_class_lookups_(0), 182 class_roots_(nullptr), 183 array_iftable_(nullptr), 184 find_array_class_cache_next_victim_(0), 185 init_done_(false), 186 log_new_dex_caches_roots_(false), 187 log_new_class_table_roots_(false), 188 intern_table_(intern_table), 189 portable_resolution_trampoline_(nullptr), 190 quick_resolution_trampoline_(nullptr), 191 portable_imt_conflict_trampoline_(nullptr), 192 quick_imt_conflict_trampoline_(nullptr), 193 quick_generic_jni_trampoline_(nullptr), 194 quick_to_interpreter_bridge_trampoline_(nullptr) { 195 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 196 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 197} 198 199// To set a value for generic JNI. May be necessary in compiler tests. 200extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 201extern "C" void art_quick_resolution_trampoline(mirror::ArtMethod*); 202extern "C" void art_quick_imt_conflict_trampoline(mirror::ArtMethod*); 203extern "C" void art_quick_to_interpreter_bridge(mirror::ArtMethod*); 204 205void ClassLinker::InitWithoutImage(const std::vector<const DexFile*>& boot_class_path) { 206 VLOG(startup) << "ClassLinker::Init"; 207 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 208 209 CHECK(!init_done_); 210 211 // java_lang_Class comes first, it's needed for AllocClass 212 Thread* self = Thread::Current(); 213 gc::Heap* heap = Runtime::Current()->GetHeap(); 214 // The GC can't handle an object with a null class since we can't get the size of this object. 215 heap->IncrementDisableMovingGC(self); 216 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 217 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 218 heap->AllocNonMovableObject<true>(self, nullptr, 219 mirror::Class::ClassClassSize(), 220 VoidFunctor())))); 221 CHECK(java_lang_Class.Get() != NULL); 222 mirror::Class::SetClassClass(java_lang_Class.Get()); 223 java_lang_Class->SetClass(java_lang_Class.Get()); 224 if (kUseBakerOrBrooksReadBarrier) { 225 java_lang_Class->AssertReadBarrierPointer(); 226 } 227 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 228 heap->DecrementDisableMovingGC(self); 229 // AllocClass(mirror::Class*) can now be used 230 231 // Class[] is used for reflection support. 232 Handle<mirror::Class> class_array_class(hs.NewHandle( 233 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 234 class_array_class->SetComponentType(java_lang_Class.Get()); 235 236 // java_lang_Object comes next so that object_array_class can be created. 237 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 238 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 239 CHECK(java_lang_Object.Get() != NULL); 240 // backfill Object as the super class of Class. 241 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 242 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 243 244 // Object[] next to hold class roots. 245 Handle<mirror::Class> object_array_class(hs.NewHandle( 246 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 247 object_array_class->SetComponentType(java_lang_Object.Get()); 248 249 // Setup the char (primitive) class to be used for char[]. 250 Handle<mirror::Class> char_class(hs.NewHandle( 251 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 252 253 // Setup the char[] class to be used for String. 254 Handle<mirror::Class> char_array_class(hs.NewHandle( 255 AllocClass(self, java_lang_Class.Get(), 256 mirror::Array::ClassSize()))); 257 char_array_class->SetComponentType(char_class.Get()); 258 mirror::CharArray::SetArrayClass(char_array_class.Get()); 259 260 // Setup String. 261 Handle<mirror::Class> java_lang_String(hs.NewHandle( 262 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 263 mirror::String::SetClass(java_lang_String.Get()); 264 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 265 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 266 267 // Setup Reference. 268 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 269 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 270 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 271 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 272 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 273 274 // Create storage for root classes, save away our work so far (requires descriptors). 275 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 276 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 277 kClassRootsMax)); 278 CHECK(!class_roots_.IsNull()); 279 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 280 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 281 SetClassRoot(kClassArrayClass, class_array_class.Get()); 282 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 283 SetClassRoot(kCharArrayClass, char_array_class.Get()); 284 SetClassRoot(kJavaLangString, java_lang_String.Get()); 285 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 286 287 // Setup the primitive type classes. 288 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 289 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 290 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 291 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 292 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 293 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 294 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 295 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 296 297 // Create array interface entries to populate once we can load system classes. 298 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 299 300 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 301 Handle<mirror::Class> int_array_class(hs.NewHandle( 302 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 303 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 304 mirror::IntArray::SetArrayClass(int_array_class.Get()); 305 SetClassRoot(kIntArrayClass, int_array_class.Get()); 306 307 // now that these are registered, we can use AllocClass() and AllocObjectArray 308 309 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 310 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 311 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 312 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 313 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 314 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 315 316 // Constructor, Field, Method, and AbstractMethod are necessary so 317 // that FindClass can link members. 318 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 319 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 320 CHECK(java_lang_reflect_ArtField.Get() != NULL); 321 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 322 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 323 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 324 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 325 326 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 327 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 328 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 329 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 330 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 331 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 332 333 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 334 335 // Set up array classes for string, field, method 336 Handle<mirror::Class> object_array_string(hs.NewHandle( 337 AllocClass(self, java_lang_Class.Get(), 338 mirror::ObjectArray<mirror::String>::ClassSize()))); 339 object_array_string->SetComponentType(java_lang_String.Get()); 340 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 341 342 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 343 AllocClass(self, java_lang_Class.Get(), 344 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 345 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 346 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 347 348 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 349 AllocClass(self, java_lang_Class.Get(), 350 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 351 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 352 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 353 354 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 355 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 356 // these roots. 357 CHECK_NE(0U, boot_class_path.size()); 358 for (size_t i = 0; i != boot_class_path.size(); ++i) { 359 const DexFile* dex_file = boot_class_path[i]; 360 CHECK(dex_file != NULL); 361 AppendToBootClassPath(*dex_file); 362 } 363 364 // now we can use FindSystemClass 365 366 // run char class through InitializePrimitiveClass to finish init 367 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 368 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 369 370 // Create runtime resolution and imt conflict methods. Also setup the default imt. 371 Runtime* runtime = Runtime::Current(); 372 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 373 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 374 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 375 376 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 377 // we do not need friend classes or a publicly exposed setter. 378 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 379 if (!runtime->IsCompiler()) { 380 // We need to set up the generic trampolines since we don't have an image. 381 quick_resolution_trampoline_ = reinterpret_cast<void*>(art_quick_resolution_trampoline); 382 quick_imt_conflict_trampoline_ = reinterpret_cast<void*>(art_quick_imt_conflict_trampoline); 383 quick_to_interpreter_bridge_trampoline_ = reinterpret_cast<void*>(art_quick_to_interpreter_bridge); 384 } 385 386 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 387 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 388 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 389 CHECK_EQ(java_lang_Object.Get(), Object_class); 390 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 391 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 392 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 393 std::ostringstream os1, os2; 394 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 395 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 396 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 397 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 398 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 399 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 400 CHECK_EQ(java_lang_String.Get(), String_class); 401 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 402 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 403 404 // Setup the primitive array type classes - can't be done until Object has a vtable. 405 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 406 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 407 408 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 409 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 410 411 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 412 CHECK_EQ(char_array_class.Get(), found_char_array_class); 413 414 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 415 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 416 417 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 418 CHECK_EQ(int_array_class.Get(), found_int_array_class); 419 420 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 421 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 422 423 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 424 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 425 426 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 427 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 428 429 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 430 CHECK_EQ(class_array_class.Get(), found_class_array_class); 431 432 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 433 CHECK_EQ(object_array_class.Get(), found_object_array_class); 434 435 // Setup the single, global copy of "iftable". 436 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 437 CHECK(java_lang_Cloneable != NULL); 438 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 439 CHECK(java_io_Serializable != NULL); 440 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 441 // crawl up and explicitly list all of the supers as well. 442 { 443 mirror::IfTable* array_iftable = array_iftable_.Read(); 444 array_iftable->SetInterface(0, java_lang_Cloneable); 445 array_iftable->SetInterface(1, java_io_Serializable); 446 } 447 448 // Sanity check Class[] and Object[]'s interfaces. 449 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 450 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 451 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 452 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 453 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 454 // dex_cache_ fields and register them in class_table_. 455 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 456 CHECK_EQ(java_lang_Class.Get(), Class_class); 457 458 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 459 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 460 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 461 462 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 463 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 464 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 465 466 mirror::Class* String_array_class = 467 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 468 CHECK_EQ(object_array_string.Get(), String_array_class); 469 470 mirror::Class* Art_method_array_class = 471 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 472 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 473 474 mirror::Class* Art_field_array_class = 475 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 476 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 477 478 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 479 480 // Create java.lang.reflect.Proxy root. 481 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 482 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 483 484 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 485 // finish initializing Reference class 486 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 487 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 488 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 489 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 490 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 491 mirror::Class* java_lang_ref_FinalizerReference = 492 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 493 java_lang_ref_FinalizerReference->SetAccessFlags( 494 java_lang_ref_FinalizerReference->GetAccessFlags() | 495 kAccClassIsReference | kAccClassIsFinalizerReference); 496 mirror::Class* java_lang_ref_PhantomReference = 497 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 498 java_lang_ref_PhantomReference->SetAccessFlags( 499 java_lang_ref_PhantomReference->GetAccessFlags() | 500 kAccClassIsReference | kAccClassIsPhantomReference); 501 mirror::Class* java_lang_ref_SoftReference = 502 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 503 java_lang_ref_SoftReference->SetAccessFlags( 504 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 505 mirror::Class* java_lang_ref_WeakReference = 506 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 507 java_lang_ref_WeakReference->SetAccessFlags( 508 java_lang_ref_WeakReference->GetAccessFlags() | 509 kAccClassIsReference | kAccClassIsWeakReference); 510 511 // Setup the ClassLoader, verifying the object_size_. 512 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 513 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 514 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 515 516 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 517 // java.lang.StackTraceElement as a convenience. 518 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 519 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 520 SetClassRoot(kJavaLangClassNotFoundException, 521 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 522 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 523 SetClassRoot(kJavaLangStackTraceElementArrayClass, 524 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 525 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 526 527 FinishInit(self); 528 529 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 530} 531 532void ClassLinker::FinishInit(Thread* self) { 533 VLOG(startup) << "ClassLinker::FinishInit entering"; 534 535 // Let the heap know some key offsets into java.lang.ref instances 536 // Note: we hard code the field indexes here rather than using FindInstanceField 537 // as the types of the field can't be resolved prior to the runtime being 538 // fully initialized 539 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 540 mirror::Class* java_lang_ref_FinalizerReference = 541 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 542 543 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 544 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 545 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 546 547 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 548 CHECK_STREQ(queue->GetName(), "queue"); 549 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 550 551 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 552 CHECK_STREQ(queueNext->GetName(), "queueNext"); 553 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 554 555 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 556 CHECK_STREQ(referent->GetName(), "referent"); 557 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 558 559 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 560 CHECK_STREQ(zombie->GetName(), "zombie"); 561 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 562 563 // ensure all class_roots_ are initialized 564 for (size_t i = 0; i < kClassRootsMax; i++) { 565 ClassRoot class_root = static_cast<ClassRoot>(i); 566 mirror::Class* klass = GetClassRoot(class_root); 567 CHECK(klass != NULL); 568 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 569 // note SetClassRoot does additional validation. 570 // if possible add new checks there to catch errors early 571 } 572 573 CHECK(!array_iftable_.IsNull()); 574 575 // disable the slow paths in FindClass and CreatePrimitiveClass now 576 // that Object, Class, and Object[] are setup 577 init_done_ = true; 578 579 VLOG(startup) << "ClassLinker::FinishInit exiting"; 580} 581 582void ClassLinker::RunRootClinits() { 583 Thread* self = Thread::Current(); 584 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 585 mirror::Class* c = GetClassRoot(ClassRoot(i)); 586 if (!c->IsArrayClass() && !c->IsPrimitive()) { 587 StackHandleScope<1> hs(self); 588 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 589 EnsureInitialized(h_class, true, true); 590 self->AssertNoPendingException(); 591 } 592 } 593} 594 595bool ClassLinker::GenerateOatFile(const char* dex_filename, 596 int oat_fd, 597 const char* oat_cache_filename, 598 std::string* error_msg) { 599 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 600 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 601 602 gc::Heap* heap = Runtime::Current()->GetHeap(); 603 std::string boot_image_option("--boot-image="); 604 if (heap->GetImageSpace() == nullptr) { 605 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 606 // out of space anyway it might not matter. 607 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 608 "without an image.", dex_filename); 609 return false; 610 } 611 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 612 613 std::string dex_file_option("--dex-file="); 614 dex_file_option += dex_filename; 615 616 std::string oat_fd_option("--oat-fd="); 617 StringAppendF(&oat_fd_option, "%d", oat_fd); 618 619 std::string oat_location_option("--oat-location="); 620 oat_location_option += oat_cache_filename; 621 622 std::vector<std::string> argv; 623 argv.push_back(dex2oat); 624 argv.push_back("--runtime-arg"); 625 argv.push_back("-classpath"); 626 argv.push_back("--runtime-arg"); 627 argv.push_back(Runtime::Current()->GetClassPathString()); 628 629 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 630 631 if (!Runtime::Current()->IsVerificationEnabled()) { 632 argv.push_back("--compiler-filter=verify-none"); 633 } 634 635 if (Runtime::Current()->MustRelocateIfPossible()) { 636 argv.push_back("--runtime-arg"); 637 argv.push_back("-Xrelocate"); 638 } else { 639 argv.push_back("--runtime-arg"); 640 argv.push_back("-Xnorelocate"); 641 } 642 643 if (!kIsTargetBuild) { 644 argv.push_back("--host"); 645 } 646 647 argv.push_back(boot_image_option); 648 argv.push_back(dex_file_option); 649 argv.push_back(oat_fd_option); 650 argv.push_back(oat_location_option); 651 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 652 for (size_t i = 0; i < compiler_options.size(); ++i) { 653 argv.push_back(compiler_options[i].c_str()); 654 } 655 656 return Exec(argv, error_msg); 657} 658 659const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 660 WriterMutexLock mu(Thread::Current(), dex_lock_); 661 if (kIsDebugBuild) { 662 for (size_t i = 0; i < oat_files_.size(); ++i) { 663 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 664 } 665 } 666 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 667 oat_files_.push_back(oat_file); 668 return oat_file; 669} 670 671OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 672 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 673 OatFile* oat_file = space->ReleaseOatFile(); 674 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 675 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 676 return *oat_file; 677} 678 679const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFileForDexFile(const DexFile& dex_file) { 680 const char* dex_location = dex_file.GetLocation().c_str(); 681 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 682 return FindOpenedOatDexFile(nullptr, dex_location, &dex_location_checksum); 683} 684 685const OatFile::OatDexFile* ClassLinker::FindOpenedOatDexFile(const char* oat_location, 686 const char* dex_location, 687 const uint32_t* dex_location_checksum) { 688 ReaderMutexLock mu(Thread::Current(), dex_lock_); 689 for (const OatFile* oat_file : oat_files_) { 690 DCHECK(oat_file != nullptr); 691 692 if (oat_location != nullptr) { 693 if (oat_file->GetLocation() != oat_location) { 694 continue; 695 } 696 } 697 698 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 699 dex_location_checksum, 700 false); 701 if (oat_dex_file != nullptr) { 702 return oat_dex_file; 703 } 704 } 705 return nullptr; 706} 707 708 709// Loads all multi dex files from the given oat file returning true on success. 710// 711// Parameters: 712// oat_file - the oat file to load from 713// dex_location - the dex location used to generate the oat file 714// dex_location_checksum - the checksum of the dex_location (may be null for pre-opted files) 715// generated - whether or not the oat_file existed before or was just (re)generated 716// error_msgs - any error messages will be appended here 717// dex_files - the loaded dex_files will be appended here (only if the loading succeeds) 718static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, 719 const char* dex_location, 720 const uint32_t* dex_location_checksum, 721 bool generated, 722 std::vector<std::string>* error_msgs, 723 std::vector<const DexFile*>* dex_files) { 724 if (oat_file == nullptr) { 725 return false; 726 } 727 728 size_t old_size = dex_files->size(); // To rollback on error. 729 730 bool success = true; 731 for (size_t i = 0; success; ++i) { 732 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 733 const char* next_name = next_name_str.c_str(); 734 735 uint32_t next_location_checksum; 736 uint32_t* next_location_checksum_pointer = &next_location_checksum; 737 std::string error_msg; 738 if ((i == 0) && (strcmp(next_name, dex_location) == 0)) { 739 // When i=0 the multidex name should be the same as the location name. We already have the 740 // checksum it so we don't need to recompute it. 741 if (dex_location_checksum == nullptr) { 742 next_location_checksum_pointer = nullptr; 743 } else { 744 next_location_checksum = *dex_location_checksum; 745 } 746 } else if (!DexFile::GetChecksum(next_name, next_location_checksum_pointer, &error_msg)) { 747 DCHECK_EQ(false, i == 0 && generated); 748 next_location_checksum_pointer = nullptr; 749 } 750 751 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 752 753 if (oat_dex_file == nullptr) { 754 if (i == 0 && generated) { 755 std::string error_msg; 756 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 757 " file'%s'", dex_location, next_location_checksum, 758 oat_file->GetLocation().c_str()); 759 error_msgs->push_back(error_msg); 760 } 761 break; // Not found, done. 762 } 763 764 // Checksum test. Test must succeed when generated. 765 success = !generated; 766 if (next_location_checksum_pointer != nullptr) { 767 success = next_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 768 } 769 770 if (success) { 771 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 772 if (dex_file == nullptr) { 773 success = false; 774 error_msgs->push_back(error_msg); 775 } else { 776 dex_files->push_back(dex_file); 777 } 778 } 779 780 // When we generated the file, we expect success, or something is terribly wrong. 781 CHECK_EQ(false, generated && !success) 782 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 783 << std::hex << " dex_location_checksum=" << next_location_checksum 784 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 785 } 786 787 if (dex_files->size() == old_size) { 788 success = false; // We did not even find classes.dex 789 } 790 791 if (success) { 792 return true; 793 } else { 794 // Free all the dex files we have loaded. 795 auto it = dex_files->begin() + old_size; 796 auto it_end = dex_files->end(); 797 for (; it != it_end; it++) { 798 delete *it; 799 } 800 dex_files->erase(dex_files->begin() + old_size, it_end); 801 802 return false; 803 } 804} 805 806// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 807// complicates the loading process, as we should not use an iterative loading process, because that 808// would register the oat file and dex files that come before the broken one. Instead, check all 809// multidex ahead of time. 810bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 811 std::vector<std::string>* error_msgs, 812 std::vector<const DexFile*>* dex_files) { 813 // 1) Check whether we have an open oat file. 814 // This requires a dex checksum, use the "primary" one. 815 uint32_t dex_location_checksum; 816 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 817 bool have_checksum = true; 818 std::string checksum_error_msg; 819 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 820 // This happens for pre-opted files since the corresponding dex files are no longer on disk. 821 dex_location_checksum_pointer = nullptr; 822 have_checksum = false; 823 } 824 825 bool needs_registering = false; 826 827 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFile(oat_location, dex_location, 828 dex_location_checksum_pointer); 829 std::unique_ptr<const OatFile> open_oat_file( 830 oat_dex_file != nullptr ? oat_dex_file->GetOatFile() : nullptr); 831 832 // 2) If we do not have an open one, maybe there's one on disk already. 833 834 // In case the oat file is not open, we play a locking game here so 835 // that if two different processes race to load and register or generate 836 // (or worse, one tries to open a partial generated file) we will be okay. 837 // This is actually common with apps that use DexClassLoader to work 838 // around the dex method reference limit and that have a background 839 // service running in a separate process. 840 ScopedFlock scoped_flock; 841 842 if (open_oat_file.get() == nullptr) { 843 if (oat_location != nullptr) { 844 // Can only do this if we have a checksum, else error. 845 if (!have_checksum) { 846 error_msgs->push_back(checksum_error_msg); 847 return false; 848 } 849 850 std::string error_msg; 851 852 // We are loading or creating one in the future. Time to set up the file lock. 853 if (!scoped_flock.Init(oat_location, &error_msg)) { 854 error_msgs->push_back(error_msg); 855 return false; 856 } 857 858 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 859 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 860 oat_location, &error_msg)); 861 862 if (open_oat_file.get() == nullptr) { 863 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 864 dex_location, oat_location, error_msg.c_str()); 865 VLOG(class_linker) << compound_msg; 866 error_msgs->push_back(compound_msg); 867 } 868 } else { 869 // TODO: What to lock here? 870 bool obsolete_file_cleanup_failed; 871 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 872 dex_location_checksum_pointer, 873 kRuntimeISA, error_msgs, 874 &obsolete_file_cleanup_failed)); 875 // There's no point in going forward and eventually try to regenerate the 876 // file if we couldn't remove the obsolete one. Mostly likely we will fail 877 // with the same error when trying to write the new file. 878 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 879 if (obsolete_file_cleanup_failed) { 880 return false; 881 } 882 } 883 needs_registering = true; 884 } 885 886 // 3) If we have an oat file, check all contained multidex files for our dex_location. 887 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 888 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 889 dex_location_checksum_pointer, 890 false, error_msgs, dex_files); 891 if (success) { 892 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 893 if (needs_registering) { 894 // We opened the oat file, so we must register it. 895 RegisterOatFile(oat_file); 896 } 897 // If the file isn't executable we failed patchoat but did manage to get the dex files. 898 return oat_file->IsExecutable(); 899 } else { 900 if (needs_registering) { 901 // We opened it, delete it. 902 open_oat_file.reset(); 903 } else { 904 open_oat_file.release(); // Do not delete open oat files. 905 } 906 } 907 908 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 909 910 // Need a checksum, fail else. 911 if (!have_checksum) { 912 error_msgs->push_back(checksum_error_msg); 913 return false; 914 } 915 916 // Look in cache location if no oat_location is given. 917 std::string cache_location; 918 if (oat_location == nullptr) { 919 // Use the dalvik cache. 920 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 921 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 922 oat_location = cache_location.c_str(); 923 } 924 925 bool has_flock = true; 926 // Definitely need to lock now. 927 if (!scoped_flock.HasFile()) { 928 std::string error_msg; 929 if (!scoped_flock.Init(oat_location, &error_msg)) { 930 error_msgs->push_back(error_msg); 931 has_flock = false; 932 } 933 } 934 935 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 936 // Create the oat file. 937 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 938 oat_location, error_msgs)); 939 } 940 941 // Failed, bail. 942 if (open_oat_file.get() == nullptr) { 943 std::string error_msg; 944 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 945 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 946 error_msgs->push_back(error_msg); 947 return false; 948 } 949 950 // Try to load again, but stronger checks. 951 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, 952 dex_location_checksum_pointer, 953 true, error_msgs, dex_files); 954 if (success) { 955 RegisterOatFile(open_oat_file.release()); 956 return true; 957 } else { 958 return false; 959 } 960} 961 962const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 963 uint32_t dex_location_checksum, 964 const char* oat_location, 965 std::string* error_msg) { 966 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 967 !Runtime::Current()->IsCompiler(), 968 error_msg)); 969 if (oat_file.get() == nullptr) { 970 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 971 error_msg->c_str()); 972 return nullptr; 973 } 974 Runtime* runtime = Runtime::Current(); 975 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 976 if (image_space != nullptr) { 977 const ImageHeader& image_header = image_space->GetImageHeader(); 978 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 979 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 980 if (expected_image_oat_checksum != actual_image_oat_checksum) { 981 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 982 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 983 actual_image_oat_checksum); 984 return nullptr; 985 } 986 987 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 988 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 989 if (expected_image_oat_offset != actual_image_oat_offset) { 990 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 991 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 992 actual_image_oat_offset); 993 return nullptr; 994 } 995 int32_t expected_patch_delta = image_header.GetPatchDelta(); 996 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 997 if (expected_patch_delta != actual_patch_delta) { 998 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 999 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 1000 return nullptr; 1001 } 1002 } 1003 1004 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1005 &dex_location_checksum); 1006 if (oat_dex_file == nullptr) { 1007 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 1008 dex_location); 1009 return nullptr; 1010 } 1011 uint32_t expected_dex_checksum = dex_location_checksum; 1012 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 1013 if (expected_dex_checksum != actual_dex_checksum) { 1014 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 1015 "found 0x%x", oat_location, expected_dex_checksum, 1016 actual_dex_checksum); 1017 return nullptr; 1018 } 1019 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 1020 if (dex_file.get() != nullptr) { 1021 return oat_file.release(); 1022 } else { 1023 return nullptr; 1024 } 1025} 1026 1027const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1028 int fd, const char* oat_location, 1029 std::vector<std::string>* error_msgs) { 1030 // Generate the output oat file for the dex file 1031 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1032 std::string error_msg; 1033 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1034 CHECK(!error_msg.empty()); 1035 error_msgs->push_back(error_msg); 1036 return nullptr; 1037 } 1038 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 1039 !Runtime::Current()->IsCompiler(), 1040 &error_msg)); 1041 if (oat_file.get() == nullptr) { 1042 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1043 oat_location, error_msg.c_str()); 1044 error_msgs->push_back(compound_msg); 1045 return nullptr; 1046 } 1047 1048 return oat_file.release(); 1049} 1050 1051bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1052 const InstructionSet instruction_set) { 1053 Runtime* runtime = Runtime::Current(); 1054 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1055 if (image_space == nullptr) { 1056 return false; 1057 } 1058 uint32_t image_oat_checksum = 0; 1059 if (instruction_set == kRuntimeISA) { 1060 const ImageHeader& image_header = image_space->GetImageHeader(); 1061 image_oat_checksum = image_header.GetOatChecksum(); 1062 } else { 1063 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1064 image_space->GetImageLocation().c_str(), instruction_set)); 1065 image_oat_checksum = image_header->GetOatChecksum(); 1066 } 1067 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1068} 1069 1070bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1071 const InstructionSet instruction_set, 1072 std::string* error_msg) { 1073 Runtime* runtime = Runtime::Current(); 1074 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1075 if (image_space == nullptr) { 1076 *error_msg = "No image space for verification against"; 1077 return false; 1078 } 1079 1080 // If the requested instruction set is the same as the current runtime, 1081 // we can use the checksums directly. If it isn't, we'll have to read the 1082 // image header from the image for the right instruction set. 1083 uint32_t image_oat_checksum = 0; 1084 uintptr_t image_oat_data_begin = 0; 1085 int32_t image_patch_delta = 0; 1086 if (instruction_set == Runtime::Current()->GetInstructionSet()) { 1087 const ImageHeader& image_header = image_space->GetImageHeader(); 1088 image_oat_checksum = image_header.GetOatChecksum(); 1089 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1090 image_patch_delta = image_header.GetPatchDelta(); 1091 } else { 1092 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1093 image_space->GetImageLocation().c_str(), instruction_set)); 1094 image_oat_checksum = image_header->GetOatChecksum(); 1095 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1096 image_patch_delta = image_header->GetPatchDelta(); 1097 } 1098 const OatHeader& oat_header = oat_file->GetOatHeader(); 1099 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1100 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1101 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1102 if (!ret) { 1103 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1104 oat_file->GetLocation().c_str(), 1105 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1106 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1107 oat_file->GetOatHeader().GetImagePatchDelta(), 1108 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1109 } 1110 return ret; 1111} 1112 1113bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1114 const char* dex_location, 1115 uint32_t dex_location_checksum, 1116 const InstructionSet instruction_set, 1117 std::string* error_msg) { 1118 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1119 return false; 1120 } 1121 1122 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1123 &dex_location_checksum); 1124 if (oat_dex_file == NULL) { 1125 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1126 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1127 for (const OatFile::OatDexFile* oat_dex_file : oat_file->GetOatDexFiles()) { 1128 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s' with checksum 0x%x", 1129 oat_file->GetLocation().c_str(), 1130 oat_dex_file->GetDexFileLocation().c_str(), 1131 oat_dex_file->GetDexFileLocationChecksum()); 1132 } 1133 return false; 1134 } 1135 1136 if (dex_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) { 1137 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1138 oat_file->GetLocation().c_str(), 1139 oat_dex_file->GetDexFileLocationChecksum(), 1140 dex_location, dex_location_checksum); 1141 return false; 1142 } 1143 return true; 1144} 1145 1146bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1147 const char* dex_location, 1148 const uint32_t* dex_location_checksum, 1149 std::string* error_msg) { 1150 CHECK(oat_file != nullptr); 1151 CHECK(dex_location != nullptr); 1152 std::unique_ptr<const DexFile> dex_file; 1153 if (dex_location_checksum == nullptr) { 1154 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1155 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1156 // directory. 1157 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1158 if (oat_dex_file == nullptr) { 1159 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1160 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1161 error_msg->c_str()); 1162 return false; 1163 } 1164 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1165 } else { 1166 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, *dex_location_checksum, 1167 kRuntimeISA, error_msg); 1168 if (!verified) { 1169 return false; 1170 } 1171 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1172 dex_location_checksum)->OpenDexFile(error_msg)); 1173 } 1174 return dex_file.get() != nullptr; 1175} 1176 1177const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1178 const char* dex_location, 1179 const uint32_t* dex_location_checksum, 1180 InstructionSet isa, 1181 std::vector<std::string>* error_msgs, 1182 bool* obsolete_file_cleanup_failed) { 1183 *obsolete_file_cleanup_failed = false; 1184 bool already_opened = false; 1185 std::string dex_location_str(dex_location); 1186 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1187 &already_opened, 1188 obsolete_file_cleanup_failed, 1189 error_msgs)); 1190 std::string error_msg; 1191 if (oat_file.get() == nullptr) { 1192 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1193 dex_location)); 1194 return nullptr; 1195 } else if (oat_file->IsExecutable() && 1196 !VerifyOatWithDexFile(oat_file.get(), dex_location, 1197 dex_location_checksum, &error_msg)) { 1198 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1199 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1200 error_msg.c_str())); 1201 return nullptr; 1202 } else if (!oat_file->IsExecutable() && 1203 Runtime::Current()->GetHeap()->HasImageSpace() && 1204 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1205 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1206 "dex location '%s'. Image checksum incorrect.", 1207 oat_file->GetLocation().c_str(), dex_location)); 1208 return nullptr; 1209 } else { 1210 return oat_file.release(); 1211 } 1212} 1213 1214const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1215 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1216 for (size_t i = 0; i < oat_files_.size(); i++) { 1217 const OatFile* oat_file = oat_files_[i]; 1218 DCHECK(oat_file != nullptr); 1219 if (oat_file->GetLocation() == oat_location) { 1220 return oat_file; 1221 } 1222 } 1223 return nullptr; 1224} 1225 1226const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1227 InstructionSet isa, 1228 bool *already_opened, 1229 bool *obsolete_file_cleanup_failed, 1230 std::vector<std::string>* error_msgs) { 1231 // Find out if we've already opened the file 1232 const OatFile* ret = nullptr; 1233 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1234 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1235 if (ret != nullptr) { 1236 *already_opened = true; 1237 return ret; 1238 } 1239 1240 std::string dalvik_cache; 1241 bool have_android_data = false; 1242 bool have_dalvik_cache = false; 1243 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1244 &have_android_data, &have_dalvik_cache); 1245 std::string cache_filename; 1246 if (have_dalvik_cache) { 1247 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1248 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1249 if (ret != nullptr) { 1250 *already_opened = true; 1251 return ret; 1252 } 1253 } else { 1254 // If we need to relocate we should just place odex back where it started. 1255 cache_filename = odex_filename; 1256 } 1257 1258 ret = nullptr; 1259 1260 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1261 // 1262 // Now we do the following: 1263 // 1) Try and open the odex version 1264 // 2) If present, checksum-verified & relocated correctly return it 1265 // 3) Close the odex version to free up its address space. 1266 // 4) Try and open the cache version 1267 // 5) If present, checksum-verified & relocated correctly return it 1268 // 6) Close the cache version to free up its address space. 1269 // 7) If we should relocate: 1270 // a) If we have opened and checksum-verified the odex version relocate it to 1271 // 'cache_filename' and return it 1272 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1273 // it. This should not happen often (I think only the run-test's will hit this case). 1274 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1275 // this point. 1276 // 9) Return nullptr 1277 1278 *already_opened = false; 1279 const Runtime* runtime = Runtime::Current(); 1280 CHECK(runtime != nullptr); 1281 bool executable = !runtime->IsCompiler(); 1282 1283 std::string odex_error_msg; 1284 bool should_patch_system = false; 1285 bool odex_checksum_verified = false; 1286 bool have_system_odex = false; 1287 { 1288 // There is a high probability that these both these oat files map similar/the same address 1289 // spaces so we must scope them like this so they each gets its turn. 1290 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, NULL, 1291 executable, &odex_error_msg)); 1292 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1293 &odex_checksum_verified, 1294 &odex_error_msg)) { 1295 error_msgs->push_back(odex_error_msg); 1296 return odex_oat_file.release(); 1297 } else { 1298 if (odex_checksum_verified) { 1299 // We can just relocate 1300 should_patch_system = true; 1301 odex_error_msg = "Image Patches are incorrect"; 1302 } 1303 if (odex_oat_file.get() != nullptr) { 1304 have_system_odex = true; 1305 } 1306 } 1307 } 1308 1309 std::string cache_error_msg; 1310 bool should_patch_cache = false; 1311 bool cache_checksum_verified = false; 1312 if (have_dalvik_cache) { 1313 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, NULL, 1314 executable, &cache_error_msg)); 1315 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1316 &cache_checksum_verified, 1317 &cache_error_msg)) { 1318 error_msgs->push_back(cache_error_msg); 1319 return cache_oat_file.release(); 1320 } else if (cache_checksum_verified) { 1321 // We can just relocate 1322 should_patch_cache = true; 1323 cache_error_msg = "Image Patches are incorrect"; 1324 } 1325 } else if (have_android_data) { 1326 // dalvik_cache does not exist but android data does. This means we should be able to create 1327 // it, so we should try. 1328 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1329 } 1330 1331 ret = nullptr; 1332 std::string error_msg; 1333 if (runtime->CanRelocate()) { 1334 // Run relocation 1335 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1336 if (space != nullptr) { 1337 const std::string& image_location = space->GetImageLocation(); 1338 if (odex_checksum_verified && should_patch_system) { 1339 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1340 } else if (cache_checksum_verified && should_patch_cache) { 1341 CHECK(have_dalvik_cache); 1342 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1343 } 1344 } else if (have_system_odex) { 1345 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1346 } 1347 } 1348 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1349 // implicitly: were able to fine where the cached version is but we were unable to use it, 1350 // either as a destination for relocation or to open a file. We should delete it if it is 1351 // there. 1352 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1353 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1354 "searching for dex file %s: %s", 1355 cache_filename.c_str(), dex_location.c_str(), 1356 strerror(errno)); 1357 error_msgs->push_back(rm_error_msg); 1358 VLOG(class_linker) << rm_error_msg; 1359 // Let the caller know that we couldn't remove the obsolete file. 1360 // This is a good indication that further writes may fail as well. 1361 *obsolete_file_cleanup_failed = true; 1362 } 1363 } 1364 if (ret == nullptr) { 1365 VLOG(class_linker) << error_msg; 1366 error_msgs->push_back(error_msg); 1367 std::string relocation_msg; 1368 if (runtime->CanRelocate()) { 1369 relocation_msg = StringPrintf(" and relocation failed"); 1370 } 1371 if (have_dalvik_cache && cache_checksum_verified) { 1372 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1373 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1374 cache_filename.c_str(), cache_error_msg.c_str(), 1375 relocation_msg.c_str()); 1376 } else { 1377 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1378 "dalvik_cache availible)%s.", odex_filename.c_str(), 1379 odex_error_msg.c_str(), relocation_msg.c_str()); 1380 } 1381 VLOG(class_linker) << error_msg; 1382 error_msgs->push_back(error_msg); 1383 } 1384 return ret; 1385} 1386 1387const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1388 InstructionSet isa, 1389 std::string* error_msg) { 1390 // We open it non-executable 1391 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, NULL, false, error_msg)); 1392 if (output.get() == nullptr) { 1393 return nullptr; 1394 } 1395 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1396 VerifyOatImageChecksum(output.get(), isa)) { 1397 return output.release(); 1398 } else { 1399 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1400 oat_path.c_str()); 1401 return nullptr; 1402 } 1403} 1404 1405const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1406 const std::string& output_oat, 1407 const std::string& image_location, 1408 InstructionSet isa, 1409 std::string* error_msg) { 1410 if (!Runtime::Current()->GetHeap()->HasImageSpace()) { 1411 // We don't have an image space so there is no point in trying to patchoat. 1412 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1413 << "running without an image. Attempting to use oat file for interpretation."; 1414 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1415 } 1416 if (!Runtime::Current()->IsDex2OatEnabled()) { 1417 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1418 // input_oat but make sure we only do interpretation on it's dex files. 1419 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1420 << "disabled. Attempting to use oat file for interpretation"; 1421 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1422 } 1423 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1424 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1425 1426 std::string isa_arg("--instruction-set="); 1427 isa_arg += GetInstructionSetString(isa); 1428 std::string input_oat_filename_arg("--input-oat-file="); 1429 input_oat_filename_arg += input_oat; 1430 std::string output_oat_filename_arg("--output-oat-file="); 1431 output_oat_filename_arg += output_oat; 1432 std::string patched_image_arg("--patched-image-location="); 1433 patched_image_arg += image_location; 1434 1435 std::vector<std::string> argv; 1436 argv.push_back(patchoat); 1437 argv.push_back(isa_arg); 1438 argv.push_back(input_oat_filename_arg); 1439 argv.push_back(output_oat_filename_arg); 1440 argv.push_back(patched_image_arg); 1441 1442 std::string command_line(Join(argv, ' ')); 1443 LOG(INFO) << "Relocate Oat File: " << command_line; 1444 bool success = Exec(argv, error_msg); 1445 if (success) { 1446 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, NULL, 1447 !Runtime::Current()->IsCompiler(), error_msg)); 1448 bool checksum_verified = false; 1449 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1450 return output.release(); 1451 } else if (output.get() != nullptr) { 1452 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1453 "but output file '%s' failed verifcation: %s", 1454 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1455 } else { 1456 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1457 "but was unable to open output file '%s': %s", 1458 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1459 } 1460 } else if (!Runtime::Current()->IsCompiler()) { 1461 // patchoat failed which means we probably don't have enough room to place the output oat file, 1462 // instead of failing we should just run the interpreter from the dex files in the input oat. 1463 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1464 << "for interpretation. patchoat failure was: " << *error_msg; 1465 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1466 } else { 1467 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1468 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1469 error_msg->c_str()); 1470 } 1471 return nullptr; 1472} 1473 1474int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1475 Runtime* runtime = Runtime::Current(); 1476 int32_t real_patch_delta; 1477 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1478 CHECK(image_space != nullptr); 1479 if (isa == Runtime::Current()->GetInstructionSet()) { 1480 const ImageHeader& image_header = image_space->GetImageHeader(); 1481 real_patch_delta = image_header.GetPatchDelta(); 1482 } else { 1483 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1484 image_space->GetImageLocation().c_str(), isa)); 1485 real_patch_delta = image_header->GetPatchDelta(); 1486 } 1487 const OatHeader& oat_header = oat_file->GetOatHeader(); 1488 return real_patch_delta - oat_header.GetImagePatchDelta(); 1489} 1490 1491bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1492 bool* checksum_verified, 1493 std::string* error_msg) { 1494 std::string compound_msg("Oat file failed to verify: "); 1495 Runtime* runtime = Runtime::Current(); 1496 uint32_t real_image_checksum; 1497 void* real_image_oat_offset; 1498 int32_t real_patch_delta; 1499 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1500 if (image_space == nullptr) { 1501 *error_msg = "No image space present"; 1502 return false; 1503 } 1504 if (isa == Runtime::Current()->GetInstructionSet()) { 1505 const ImageHeader& image_header = image_space->GetImageHeader(); 1506 real_image_checksum = image_header.GetOatChecksum(); 1507 real_image_oat_offset = image_header.GetOatDataBegin(); 1508 real_patch_delta = image_header.GetPatchDelta(); 1509 } else { 1510 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1511 image_space->GetImageLocation().c_str(), isa)); 1512 real_image_checksum = image_header->GetOatChecksum(); 1513 real_image_oat_offset = image_header->GetOatDataBegin(); 1514 real_patch_delta = image_header->GetPatchDelta(); 1515 } 1516 1517 const OatHeader& oat_header = oat_file->GetOatHeader(); 1518 1519 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1520 *checksum_verified = oat_image_checksum == real_image_checksum; 1521 if (!*checksum_verified) { 1522 compound_msg += StringPrintf(" Oat Image Checksum Incorrect (expected 0x%x, recieved 0x%x)", 1523 real_image_checksum, oat_image_checksum); 1524 } 1525 1526 void* oat_image_oat_offset = 1527 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1528 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1529 if (!offset_verified) { 1530 compound_msg += StringPrintf(" Oat Image oat offset incorrect (expected 0x%p, recieved 0x%p)", 1531 real_image_oat_offset, oat_image_oat_offset); 1532 } 1533 1534 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1535 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1536 if (!patch_delta_verified) { 1537 compound_msg += StringPrintf(" Oat image patch delta incorrect (expected 0x%x, recieved 0x%x)", 1538 real_patch_delta, oat_patch_delta); 1539 } 1540 1541 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1542 if (ret) { 1543 *error_msg = compound_msg; 1544 } 1545 return ret; 1546} 1547 1548const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1549 std::string* error_msg) { 1550 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1551 if (oat_file != nullptr) { 1552 return oat_file; 1553 } 1554 1555 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1556 error_msg); 1557 if (oat_file == NULL) { 1558 return NULL; 1559 } 1560 return oat_file; 1561} 1562 1563static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1564 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1565 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1566 1567 DCHECK(obj != NULL); 1568 DCHECK(class_linker != NULL); 1569 1570 if (obj->IsArtMethod()) { 1571 mirror::ArtMethod* method = obj->AsArtMethod(); 1572 if (!method->IsNative()) { 1573 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1574 if (method != Runtime::Current()->GetResolutionMethod()) { 1575 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1576 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1577 } 1578 } 1579 } 1580} 1581 1582void ClassLinker::InitFromImage() { 1583 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1584 CHECK(!init_done_); 1585 1586 Thread* self = Thread::Current(); 1587 gc::Heap* heap = Runtime::Current()->GetHeap(); 1588 gc::space::ImageSpace* space = heap->GetImageSpace(); 1589 dex_cache_image_class_lookup_required_ = true; 1590 CHECK(space != NULL); 1591 OatFile& oat_file = GetImageOatFile(space); 1592 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1593 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1594 const char* image_file_location = oat_file.GetOatHeader(). 1595 GetStoreValueByKey(OatHeader::kImageLocationKey); 1596 CHECK(image_file_location == nullptr || *image_file_location == 0); 1597 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1598 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1599 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1600 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1601 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1602 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1603 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1604 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1605 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1606 1607 StackHandleScope<1> hs(self); 1608 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1609 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1610 AsObjectArray<mirror::Class>())); 1611 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1612 1613 // Special case of setting up the String class early so that we can test arbitrary objects 1614 // as being Strings or not 1615 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1616 1617 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1618 static_cast<uint32_t>(dex_caches->GetLength())); 1619 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1620 StackHandleScope<1> hs(self); 1621 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1622 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1623 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1624 nullptr); 1625 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1626 std::string error_msg; 1627 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1628 if (dex_file == NULL) { 1629 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1630 << " from within oat file " << oat_file.GetLocation() 1631 << " error '" << error_msg << "'"; 1632 } 1633 1634 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1635 1636 AppendToBootClassPath(*dex_file, dex_cache); 1637 } 1638 1639 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1640 // bitmap walk. 1641 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1642 1643 // Set entry point to interpreter if in InterpretOnly mode. 1644 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1645 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1646 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1647 } 1648 1649 // reinit class_roots_ 1650 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1651 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1652 1653 // reinit array_iftable_ from any array class instance, they should be == 1654 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1655 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1656 // String class root was set above 1657 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1658 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1659 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1660 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1661 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1662 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1663 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1664 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1665 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1666 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1667 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1668 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1669 1670 FinishInit(self); 1671 1672 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1673} 1674 1675void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1676 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1677 if ((flags & kVisitRootFlagAllRoots) != 0) { 1678 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1679 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1680 } 1681 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1682 for (auto& pair : new_class_roots_) { 1683 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1684 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1685 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1686 if (UNLIKELY(new_ref != old_ref)) { 1687 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1688 // corresponding object. This is slow, but luckily for us, this may only happen with a 1689 // concurrent moving GC. 1690 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1691 it != end && it->first == pair.first; ++it) { 1692 // If the class stored matches the old class, update it to the new value. 1693 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1694 it->second = GcRoot<mirror::Class>(new_ref); 1695 } 1696 } 1697 } 1698 } 1699 } 1700 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1701 new_class_roots_.clear(); 1702 } 1703 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1704 log_new_class_table_roots_ = true; 1705 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1706 log_new_class_table_roots_ = false; 1707 } 1708 // We deliberately ignore the class roots in the image since we 1709 // handle image roots by using the MS/CMS rescanning of dirty cards. 1710} 1711 1712// Keep in sync with InitCallback. Anything we visit, we need to 1713// reinit references to when reinitializing a ClassLinker from a 1714// mapped image. 1715void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1716 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1717 Thread* self = Thread::Current(); 1718 { 1719 ReaderMutexLock mu(self, dex_lock_); 1720 if ((flags & kVisitRootFlagAllRoots) != 0) { 1721 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1722 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1723 } 1724 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1725 for (size_t index : new_dex_cache_roots_) { 1726 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1727 } 1728 } 1729 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1730 new_dex_cache_roots_.clear(); 1731 } 1732 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1733 log_new_dex_caches_roots_ = true; 1734 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1735 log_new_dex_caches_roots_ = false; 1736 } 1737 } 1738 VisitClassRoots(callback, arg, flags); 1739 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1740 DCHECK(!array_iftable_.IsNull()); 1741 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1742 if (!find_array_class_cache_[i].IsNull()) { 1743 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1744 } 1745 } 1746} 1747 1748void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1749 if (dex_cache_image_class_lookup_required_) { 1750 MoveImageClassesToClassTable(); 1751 } 1752 // TODO: why isn't this a ReaderMutexLock? 1753 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1754 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1755 mirror::Class* c = it.second.Read(); 1756 if (!visitor(c, arg)) { 1757 return; 1758 } 1759 } 1760} 1761 1762static bool GetClassesVisitorSet(mirror::Class* c, void* arg) { 1763 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1764 classes->insert(c); 1765 return true; 1766} 1767 1768struct GetClassesVisitorArrayArg { 1769 Handle<mirror::ObjectArray<mirror::Class>>* classes; 1770 int32_t index; 1771 bool success; 1772}; 1773 1774static bool GetClassesVisitorArray(mirror::Class* c, void* varg) 1775 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1776 GetClassesVisitorArrayArg* arg = reinterpret_cast<GetClassesVisitorArrayArg*>(varg); 1777 if (arg->index < (*arg->classes)->GetLength()) { 1778 (*arg->classes)->Set(arg->index, c); 1779 arg->index++; 1780 return true; 1781 } else { 1782 arg->success = false; 1783 return false; 1784 } 1785} 1786 1787void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1788 // TODO: it may be possible to avoid secondary storage if we iterate over dex caches. The problem 1789 // is avoiding duplicates. 1790 if (!kMovingClasses) { 1791 std::set<mirror::Class*> classes; 1792 VisitClasses(GetClassesVisitorSet, &classes); 1793 for (mirror::Class* klass : classes) { 1794 if (!visitor(klass, arg)) { 1795 return; 1796 } 1797 } 1798 } else { 1799 Thread* self = Thread::Current(); 1800 StackHandleScope<1> hs(self); 1801 Handle<mirror::ObjectArray<mirror::Class>> classes = 1802 hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1803 GetClassesVisitorArrayArg local_arg; 1804 local_arg.classes = &classes; 1805 local_arg.success = false; 1806 // We size the array assuming classes won't be added to the class table during the visit. 1807 // If this assumption fails we iterate again. 1808 while (!local_arg.success) { 1809 size_t class_table_size; 1810 { 1811 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1812 class_table_size = class_table_.size(); 1813 } 1814 mirror::Class* class_type = mirror::Class::GetJavaLangClass(); 1815 mirror::Class* array_of_class = FindArrayClass(self, &class_type); 1816 classes.Assign( 1817 mirror::ObjectArray<mirror::Class>::Alloc(self, array_of_class, class_table_size)); 1818 CHECK(classes.Get() != nullptr); // OOME. 1819 local_arg.index = 0; 1820 local_arg.success = true; 1821 VisitClasses(GetClassesVisitorArray, &local_arg); 1822 } 1823 for (int32_t i = 0; i < classes->GetLength(); ++i) { 1824 // If the class table shrank during creation of the clases array we expect null elements. If 1825 // the class table grew then the loop repeats. If classes are created after the loop has 1826 // finished then we don't visit. 1827 mirror::Class* klass = classes->Get(i); 1828 if (klass != nullptr && !visitor(klass, arg)) { 1829 return; 1830 } 1831 } 1832 } 1833} 1834 1835ClassLinker::~ClassLinker() { 1836 mirror::Class::ResetClass(); 1837 mirror::String::ResetClass(); 1838 mirror::Reference::ResetClass(); 1839 mirror::ArtField::ResetClass(); 1840 mirror::ArtMethod::ResetClass(); 1841 mirror::BooleanArray::ResetArrayClass(); 1842 mirror::ByteArray::ResetArrayClass(); 1843 mirror::CharArray::ResetArrayClass(); 1844 mirror::DoubleArray::ResetArrayClass(); 1845 mirror::FloatArray::ResetArrayClass(); 1846 mirror::IntArray::ResetArrayClass(); 1847 mirror::LongArray::ResetArrayClass(); 1848 mirror::ShortArray::ResetArrayClass(); 1849 mirror::Throwable::ResetClass(); 1850 mirror::StackTraceElement::ResetClass(); 1851 STLDeleteElements(&boot_class_path_); 1852 STLDeleteElements(&oat_files_); 1853} 1854 1855mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1856 gc::Heap* heap = Runtime::Current()->GetHeap(); 1857 StackHandleScope<16> hs(self); 1858 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1859 Handle<mirror::DexCache> dex_cache( 1860 hs.NewHandle(down_cast<mirror::DexCache*>( 1861 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1862 VoidFunctor())))); 1863 if (dex_cache.Get() == NULL) { 1864 return NULL; 1865 } 1866 Handle<mirror::String> 1867 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1868 if (location.Get() == NULL) { 1869 return NULL; 1870 } 1871 Handle<mirror::ObjectArray<mirror::String>> 1872 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1873 if (strings.Get() == NULL) { 1874 return NULL; 1875 } 1876 Handle<mirror::ObjectArray<mirror::Class>> 1877 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1878 if (types.Get() == NULL) { 1879 return NULL; 1880 } 1881 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1882 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1883 if (methods.Get() == NULL) { 1884 return NULL; 1885 } 1886 Handle<mirror::ObjectArray<mirror::ArtField>> 1887 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1888 if (fields.Get() == NULL) { 1889 return NULL; 1890 } 1891 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1892 fields.Get()); 1893 return dex_cache.Get(); 1894} 1895 1896mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1897 uint32_t class_size) { 1898 DCHECK_GE(class_size, sizeof(mirror::Class)); 1899 gc::Heap* heap = Runtime::Current()->GetHeap(); 1900 mirror::Class::InitializeClassVisitor visitor(class_size); 1901 mirror::Object* k = kMovingClasses ? 1902 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1903 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1904 if (UNLIKELY(k == nullptr)) { 1905 CHECK(self->IsExceptionPending()); // OOME. 1906 return nullptr; 1907 } 1908 return k->AsClass(); 1909} 1910 1911mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1912 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1913} 1914 1915mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1916 return down_cast<mirror::ArtField*>( 1917 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1918} 1919 1920mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1921 return down_cast<mirror::ArtMethod*>( 1922 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1923} 1924 1925mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1926 Thread* self, size_t length) { 1927 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1928 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1929} 1930 1931mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1932 mirror::Class* klass) { 1933 DCHECK(klass != NULL); 1934 1935 // For temporary classes we must wait for them to be retired. 1936 if (init_done_ && klass->IsTemp()) { 1937 CHECK(!klass->IsResolved()); 1938 if (klass->IsErroneous()) { 1939 ThrowEarlierClassFailure(klass); 1940 return nullptr; 1941 } 1942 StackHandleScope<1> hs(self); 1943 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1944 ObjectLock<mirror::Class> lock(self, h_class); 1945 // Loop and wait for the resolving thread to retire this class. 1946 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1947 lock.WaitIgnoringInterrupts(); 1948 } 1949 if (h_class->IsErroneous()) { 1950 ThrowEarlierClassFailure(h_class.Get()); 1951 return nullptr; 1952 } 1953 CHECK(h_class->IsRetired()); 1954 // Get the updated class from class table. 1955 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1956 } 1957 1958 // Wait for the class if it has not already been linked. 1959 if (!klass->IsResolved() && !klass->IsErroneous()) { 1960 StackHandleScope<1> hs(self); 1961 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1962 ObjectLock<mirror::Class> lock(self, h_class); 1963 // Check for circular dependencies between classes. 1964 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1965 ThrowClassCircularityError(h_class.Get()); 1966 h_class->SetStatus(mirror::Class::kStatusError, self); 1967 return nullptr; 1968 } 1969 // Wait for the pending initialization to complete. 1970 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1971 lock.WaitIgnoringInterrupts(); 1972 } 1973 } 1974 1975 if (klass->IsErroneous()) { 1976 ThrowEarlierClassFailure(klass); 1977 return nullptr; 1978 } 1979 // Return the loaded class. No exceptions should be pending. 1980 CHECK(klass->IsResolved()) << PrettyClass(klass); 1981 self->AssertNoPendingException(); 1982 return klass; 1983} 1984 1985typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry; 1986 1987// Search a collection of DexFiles for a descriptor 1988ClassPathEntry FindInClassPath(const char* descriptor, 1989 const std::vector<const DexFile*>& class_path) { 1990 for (size_t i = 0; i != class_path.size(); ++i) { 1991 const DexFile* dex_file = class_path[i]; 1992 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 1993 if (dex_class_def != NULL) { 1994 return ClassPathEntry(dex_file, dex_class_def); 1995 } 1996 } 1997 // TODO: remove reinterpret_cast when issue with -std=gnu++0x host issue resolved 1998 return ClassPathEntry(reinterpret_cast<const DexFile*>(NULL), 1999 reinterpret_cast<const DexFile::ClassDef*>(NULL)); 2000} 2001 2002mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 2003 Handle<mirror::ClassLoader> class_loader) { 2004 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 2005 DCHECK(self != nullptr); 2006 self->AssertNoPendingException(); 2007 if (descriptor[1] == '\0') { 2008 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 2009 // for primitive classes that aren't backed by dex files. 2010 return FindPrimitiveClass(descriptor[0]); 2011 } 2012 // Find the class in the loaded classes table. 2013 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 2014 if (klass != nullptr) { 2015 return EnsureResolved(self, descriptor, klass); 2016 } 2017 // Class is not yet loaded. 2018 if (descriptor[0] == '[') { 2019 return CreateArrayClass(self, descriptor, class_loader); 2020 } else if (class_loader.Get() == nullptr) { 2021 // The boot class loader, search the boot class path. 2022 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2023 if (pair.second != nullptr) { 2024 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 2025 } else { 2026 // The boot class loader is searched ahead of the application class loader, failures are 2027 // expected and will be wrapped in a ClassNotFoundException. Use the pre-allocated error to 2028 // trigger the chaining with a proper stack trace. 2029 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 2030 self->SetException(ThrowLocation(), pre_allocated); 2031 return nullptr; 2032 } 2033 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 2034 // First try with the bootstrap class loader. 2035 if (class_loader.Get() != nullptr) { 2036 klass = LookupClass(descriptor, nullptr); 2037 if (klass != nullptr) { 2038 return EnsureResolved(self, descriptor, klass); 2039 } 2040 } 2041 // If the lookup failed search the boot class path. We don't perform a recursive call to avoid 2042 // a NoClassDefFoundError being allocated. 2043 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2044 if (pair.second != nullptr) { 2045 StackHandleScope<1> hs(self); 2046 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 2047 } 2048 // Next try the compile time class path. 2049 const std::vector<const DexFile*>* class_path; 2050 { 2051 ScopedObjectAccessUnchecked soa(self); 2052 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 2053 soa.AddLocalReference<jobject>(class_loader.Get())); 2054 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 2055 } 2056 pair = FindInClassPath(descriptor, *class_path); 2057 if (pair.second != nullptr) { 2058 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 2059 } 2060 } else { 2061 ScopedObjectAccessUnchecked soa(self); 2062 if (class_loader->GetClass() == 2063 soa.Decode<mirror::Class*>(WellKnownClasses::dalvik_system_PathClassLoader) && 2064 class_loader->GetParent()->GetClass() == 2065 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_BootClassLoader)) { 2066 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 2067 // Check if this would be found in the parent boot class loader. 2068 if (pair.second != nullptr) { 2069 mirror::Class* klass = LookupClass(descriptor, nullptr); 2070 if (klass != nullptr) { 2071 return EnsureResolved(self, descriptor, klass); 2072 } 2073 klass = DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, 2074 *pair.second); 2075 if (klass == nullptr) { 2076 CHECK(self->IsExceptionPending()) << descriptor; 2077 self->ClearException(); 2078 } else { 2079 return klass; 2080 } 2081 } else { 2082 // RegisterDexFile may allocate dex caches (and cause thread suspension). 2083 StackHandleScope<3> hs(self); 2084 // The class loader is a PathClassLoader which inherits from BaseDexClassLoader. 2085 // We need to get the DexPathList and loop through it. 2086 Handle<mirror::ArtField> cookie_field = 2087 hs.NewHandle(soa.DecodeField(WellKnownClasses::dalvik_system_DexFile_cookie)); 2088 Handle<mirror::ArtField> dex_file_field = 2089 hs.NewHandle( 2090 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList$Element_dexFile)); 2091 mirror::Object* dex_path_list = 2092 soa.DecodeField(WellKnownClasses::dalvik_system_PathClassLoader_pathList)-> 2093 GetObject(class_loader.Get()); 2094 if (dex_path_list != nullptr && dex_file_field.Get() != nullptr && 2095 cookie_field.Get() != nullptr) { 2096 // DexPathList has an array dexElements of Elements[] which each contain a dex file. 2097 mirror::Object* dex_elements_obj = 2098 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList_dexElements)-> 2099 GetObject(dex_path_list); 2100 // Loop through each dalvik.system.DexPathList$Element's dalvik.system.DexFile and look 2101 // at the mCookie which is a DexFile vector. 2102 if (dex_elements_obj != nullptr) { 2103 Handle<mirror::ObjectArray<mirror::Object>> dex_elements = 2104 hs.NewHandle(dex_elements_obj->AsObjectArray<mirror::Object>()); 2105 for (int32_t i = 0; i < dex_elements->GetLength(); ++i) { 2106 mirror::Object* element = dex_elements->GetWithoutChecks(i); 2107 if (element == nullptr) { 2108 // Should never happen, fall back to java code to throw a NPE. 2109 break; 2110 } 2111 mirror::Object* dex_file = dex_file_field->GetObject(element); 2112 if (dex_file != nullptr) { 2113 const uint64_t cookie = cookie_field->GetLong(dex_file); 2114 auto* dex_files = 2115 reinterpret_cast<std::vector<const DexFile*>*>(static_cast<uintptr_t>(cookie)); 2116 if (dex_files == nullptr) { 2117 // This should never happen so log a warning. 2118 LOG(WARNING) << "Null DexFile::mCookie for " << descriptor; 2119 break; 2120 } 2121 for (const DexFile* dex_file : *dex_files) { 2122 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 2123 if (dex_class_def != nullptr) { 2124 RegisterDexFile(*dex_file); 2125 mirror::Class* klass = 2126 DefineClass(descriptor, class_loader, *dex_file, *dex_class_def); 2127 if (klass == nullptr) { 2128 CHECK(self->IsExceptionPending()) << descriptor; 2129 self->ClearException(); 2130 // Exit the loop to make the java code generate an exception. 2131 i = dex_elements->GetLength(); 2132 break; 2133 } 2134 return klass; 2135 } 2136 } 2137 } 2138 } 2139 } 2140 } 2141 } 2142 } 2143 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 2144 soa.AddLocalReference<jobject>(class_loader.Get())); 2145 std::string class_name_string(DescriptorToDot(descriptor)); 2146 ScopedLocalRef<jobject> result(soa.Env(), nullptr); 2147 { 2148 ScopedThreadStateChange tsc(self, kNative); 2149 ScopedLocalRef<jobject> class_name_object(soa.Env(), 2150 soa.Env()->NewStringUTF(class_name_string.c_str())); 2151 if (class_name_object.get() == nullptr) { 2152 DCHECK(self->IsExceptionPending()); // OOME. 2153 return nullptr; 2154 } 2155 CHECK(class_loader_object.get() != nullptr); 2156 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 2157 WellKnownClasses::java_lang_ClassLoader_loadClass, 2158 class_name_object.get())); 2159 } 2160 if (self->IsExceptionPending()) { 2161 // If the ClassLoader threw, pass that exception up. 2162 return nullptr; 2163 } else if (result.get() == nullptr) { 2164 // broken loader - throw NPE to be compatible with Dalvik 2165 ThrowNullPointerException(nullptr, StringPrintf("ClassLoader.loadClass returned null for %s", 2166 class_name_string.c_str()).c_str()); 2167 return nullptr; 2168 } else { 2169 // success, return mirror::Class* 2170 return soa.Decode<mirror::Class*>(result.get()); 2171 } 2172 } 2173 2174 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 2175 return nullptr; 2176} 2177 2178mirror::Class* ClassLinker::DefineClass(const char* descriptor, 2179 Handle<mirror::ClassLoader> class_loader, 2180 const DexFile& dex_file, 2181 const DexFile::ClassDef& dex_class_def) { 2182 Thread* self = Thread::Current(); 2183 StackHandleScope<3> hs(self); 2184 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2185 bool should_allocate = false; 2186 2187 // Load the class from the dex file. 2188 if (UNLIKELY(!init_done_)) { 2189 // finish up init of hand crafted class_roots_ 2190 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2191 klass.Assign(GetClassRoot(kJavaLangObject)); 2192 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2193 klass.Assign(GetClassRoot(kJavaLangClass)); 2194 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2195 klass.Assign(GetClassRoot(kJavaLangString)); 2196 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2197 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2198 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2199 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2200 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2201 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2202 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2203 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2204 } else { 2205 should_allocate = true; 2206 } 2207 } else { 2208 should_allocate = true; 2209 } 2210 2211 if (should_allocate) { 2212 // Allocate a class with the status of not ready. 2213 // Interface object should get the right size here. Regular class will 2214 // figure out the right size later and be replaced with one of the right 2215 // size when the class becomes resolved. 2216 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2217 } 2218 if (UNLIKELY(klass.Get() == nullptr)) { 2219 CHECK(self->IsExceptionPending()); // Expect an OOME. 2220 return nullptr; 2221 } 2222 klass->SetDexCache(FindDexCache(dex_file)); 2223 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 2224 ObjectLock<mirror::Class> lock(self, klass); 2225 if (self->IsExceptionPending()) { 2226 // An exception occured during load, set status to erroneous while holding klass' lock in case 2227 // notification is necessary. 2228 if (!klass->IsErroneous()) { 2229 klass->SetStatus(mirror::Class::kStatusError, self); 2230 } 2231 return nullptr; 2232 } 2233 klass->SetClinitThreadId(self->GetTid()); 2234 2235 // Add the newly loaded class to the loaded classes table. 2236 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 2237 if (existing != nullptr) { 2238 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2239 // this thread to block. 2240 return EnsureResolved(self, descriptor, existing); 2241 } 2242 2243 // Finish loading (if necessary) by finding parents 2244 CHECK(!klass->IsLoaded()); 2245 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2246 // Loading failed. 2247 if (!klass->IsErroneous()) { 2248 klass->SetStatus(mirror::Class::kStatusError, self); 2249 } 2250 return nullptr; 2251 } 2252 CHECK(klass->IsLoaded()); 2253 // Link the class (if necessary) 2254 CHECK(!klass->IsResolved()); 2255 // TODO: Use fast jobjects? 2256 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2257 2258 mirror::Class* new_class = nullptr; 2259 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2260 // Linking failed. 2261 if (!klass->IsErroneous()) { 2262 klass->SetStatus(mirror::Class::kStatusError, self); 2263 } 2264 return nullptr; 2265 } 2266 self->AssertNoPendingException(); 2267 CHECK(new_class != nullptr) << descriptor; 2268 CHECK(new_class->IsResolved()) << descriptor; 2269 2270 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2271 2272 /* 2273 * We send CLASS_PREPARE events to the debugger from here. The 2274 * definition of "preparation" is creating the static fields for a 2275 * class and initializing them to the standard default values, but not 2276 * executing any code (that comes later, during "initialization"). 2277 * 2278 * We did the static preparation in LinkClass. 2279 * 2280 * The class has been prepared and resolved but possibly not yet verified 2281 * at this point. 2282 */ 2283 Dbg::PostClassPrepare(new_class_h.Get()); 2284 2285 return new_class_h.Get(); 2286} 2287 2288uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2289 const DexFile::ClassDef& dex_class_def) { 2290 const byte* class_data = dex_file.GetClassData(dex_class_def); 2291 size_t num_ref = 0; 2292 size_t num_32 = 0; 2293 size_t num_64 = 0; 2294 if (class_data != NULL) { 2295 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2296 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2297 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2298 char c = descriptor[0]; 2299 if (c == 'L' || c == '[') { 2300 num_ref++; 2301 } else if (c == 'J' || c == 'D') { 2302 num_64++; 2303 } else { 2304 num_32++; 2305 } 2306 } 2307 } 2308 return mirror::Class::ComputeClassSize(false, 0, num_32, num_64, num_ref); 2309} 2310 2311bool ClassLinker::FindOatClass(const DexFile& dex_file, 2312 uint16_t class_def_idx, 2313 OatFile::OatClass* oat_class) { 2314 DCHECK(oat_class != nullptr); 2315 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2316 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 2317 if (oat_dex_file == nullptr) { 2318 return false; 2319 } 2320 *oat_class = oat_dex_file->GetOatClass(class_def_idx); 2321 return true; 2322} 2323 2324static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2325 uint32_t method_idx) { 2326 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2327 const byte* class_data = dex_file.GetClassData(class_def); 2328 CHECK(class_data != NULL); 2329 ClassDataItemIterator it(dex_file, class_data); 2330 // Skip fields 2331 while (it.HasNextStaticField()) { 2332 it.Next(); 2333 } 2334 while (it.HasNextInstanceField()) { 2335 it.Next(); 2336 } 2337 // Process methods 2338 size_t class_def_method_index = 0; 2339 while (it.HasNextDirectMethod()) { 2340 if (it.GetMemberIndex() == method_idx) { 2341 return class_def_method_index; 2342 } 2343 class_def_method_index++; 2344 it.Next(); 2345 } 2346 while (it.HasNextVirtualMethod()) { 2347 if (it.GetMemberIndex() == method_idx) { 2348 return class_def_method_index; 2349 } 2350 class_def_method_index++; 2351 it.Next(); 2352 } 2353 DCHECK(!it.HasNext()); 2354 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2355 return 0; 2356} 2357 2358bool ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, OatFile::OatMethod* oat_method) { 2359 DCHECK(oat_method != nullptr); 2360 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2361 // method for direct methods (or virtual methods made direct). 2362 mirror::Class* declaring_class = method->GetDeclaringClass(); 2363 size_t oat_method_index; 2364 if (method->IsStatic() || method->IsDirect()) { 2365 // Simple case where the oat method index was stashed at load time. 2366 oat_method_index = method->GetMethodIndex(); 2367 } else { 2368 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2369 // by search for its position in the declared virtual methods. 2370 oat_method_index = declaring_class->NumDirectMethods(); 2371 size_t end = declaring_class->NumVirtualMethods(); 2372 bool found = false; 2373 for (size_t i = 0; i < end; i++) { 2374 // Check method index instead of identity in case of duplicate method definitions. 2375 if (method->GetDexMethodIndex() == 2376 declaring_class->GetVirtualMethod(i)->GetDexMethodIndex()) { 2377 found = true; 2378 break; 2379 } 2380 oat_method_index++; 2381 } 2382 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2383 } 2384 DCHECK_EQ(oat_method_index, 2385 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2386 method->GetDeclaringClass()->GetDexClassDefIndex(), 2387 method->GetDexMethodIndex())); 2388 OatFile::OatClass oat_class; 2389 if (!FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2390 declaring_class->GetDexClassDefIndex(), 2391 &oat_class)) { 2392 return false; 2393 } 2394 2395 *oat_method = oat_class.GetOatMethod(oat_method_index); 2396 return true; 2397} 2398 2399// Special case to get oat code without overwriting a trampoline. 2400const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2401 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2402 if (method->IsProxyMethod()) { 2403 return GetQuickProxyInvokeHandler(); 2404 } 2405 OatFile::OatMethod oat_method; 2406 const void* result = nullptr; 2407 if (FindOatMethodFor(method, &oat_method)) { 2408 result = oat_method.GetQuickCode(); 2409 } 2410 2411 if (result == nullptr) { 2412 if (method->IsNative()) { 2413 // No code and native? Use generic trampoline. 2414 result = GetQuickGenericJniTrampoline(); 2415 } else if (method->IsPortableCompiled()) { 2416 // No code? Do we expect portable code? 2417 result = GetQuickToPortableBridge(); 2418 } else { 2419 // No code? You must mean to go into the interpreter. 2420 result = GetQuickToInterpreterBridge(); 2421 } 2422 } 2423 return result; 2424} 2425 2426const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2427 bool* have_portable_code) { 2428 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2429 *have_portable_code = false; 2430 if (method->IsProxyMethod()) { 2431 return GetPortableProxyInvokeHandler(); 2432 } 2433 OatFile::OatMethod oat_method; 2434 const void* result = nullptr; 2435 const void* quick_code = nullptr; 2436 if (FindOatMethodFor(method, &oat_method)) { 2437 result = oat_method.GetPortableCode(); 2438 quick_code = oat_method.GetQuickCode(); 2439 } 2440 2441 if (result == nullptr) { 2442 if (quick_code == nullptr) { 2443 // No code? You must mean to go into the interpreter. 2444 result = GetPortableToInterpreterBridge(); 2445 } else { 2446 // No code? But there's quick code, so use a bridge. 2447 result = GetPortableToQuickBridge(); 2448 } 2449 } else { 2450 *have_portable_code = true; 2451 } 2452 return result; 2453} 2454 2455const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2456 uint32_t method_idx) { 2457 OatFile::OatClass oat_class; 2458 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2459 return nullptr; 2460 } 2461 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2462 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2463} 2464 2465const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2466 uint32_t method_idx) { 2467 OatFile::OatClass oat_class; 2468 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2469 return nullptr; 2470 } 2471 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2472 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2473} 2474 2475// Returns true if the method must run with interpreter, false otherwise. 2476static bool NeedsInterpreter( 2477 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2478 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2479 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2480 // No code: need interpreter. 2481 // May return true for native code, in the case of generic JNI 2482 // DCHECK(!method->IsNative()); 2483 return true; 2484 } 2485#ifdef ART_SEA_IR_MODE 2486 ScopedObjectAccess soa(Thread::Current()); 2487 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2488 LOG(INFO) << "Found " << PrettyMethod(method); 2489 return false; 2490 } 2491#endif 2492 // If interpreter mode is enabled, every method (except native and proxy) must 2493 // be run with interpreter. 2494 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2495 !method->IsNative() && !method->IsProxyMethod(); 2496} 2497 2498void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2499 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2500 if (klass->NumDirectMethods() == 0) { 2501 return; // No direct methods => no static methods. 2502 } 2503 Runtime* runtime = Runtime::Current(); 2504 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2505 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2506 return; // OAT file unavailable. 2507 } 2508 } 2509 2510 const DexFile& dex_file = klass->GetDexFile(); 2511 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2512 CHECK(dex_class_def != nullptr); 2513 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2514 // There should always be class data if there were direct methods. 2515 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2516 ClassDataItemIterator it(dex_file, class_data); 2517 // Skip fields 2518 while (it.HasNextStaticField()) { 2519 it.Next(); 2520 } 2521 while (it.HasNextInstanceField()) { 2522 it.Next(); 2523 } 2524 OatFile::OatClass oat_class; 2525 bool has_oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class); 2526 // Link the code of methods skipped by LinkCode. 2527 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2528 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2529 if (!method->IsStatic()) { 2530 // Only update static methods. 2531 continue; 2532 } 2533 const void* portable_code = nullptr; 2534 const void* quick_code = nullptr; 2535 if (has_oat_class) { 2536 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2537 portable_code = oat_method.GetPortableCode(); 2538 quick_code = oat_method.GetQuickCode(); 2539 } 2540 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2541 bool have_portable_code = false; 2542 if (enter_interpreter) { 2543 // Use interpreter entry point. 2544 // Check whether the method is native, in which case it's generic JNI. 2545 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2546 quick_code = GetQuickGenericJniTrampoline(); 2547 portable_code = GetPortableToQuickBridge(); 2548 } else { 2549 portable_code = GetPortableToInterpreterBridge(); 2550 quick_code = GetQuickToInterpreterBridge(); 2551 } 2552 } else { 2553 if (portable_code == nullptr) { 2554 portable_code = GetPortableToQuickBridge(); 2555 } else { 2556 have_portable_code = true; 2557 } 2558 if (quick_code == nullptr) { 2559 quick_code = GetQuickToPortableBridge(); 2560 } 2561 } 2562 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2563 have_portable_code); 2564 } 2565 // Ignore virtual methods on the iterator. 2566} 2567 2568void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 2569 const DexFile& dex_file, uint32_t dex_method_index, 2570 uint32_t method_index) { 2571 if (Runtime::Current()->IsCompiler()) { 2572 // The following code only applies to a non-compiler runtime. 2573 return; 2574 } 2575 // Method shouldn't have already been linked. 2576 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2577 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2578 if (oat_class != nullptr) { 2579 // Every kind of method should at least get an invoke stub from the oat_method. 2580 // non-abstract methods also get their code pointers. 2581 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2582 oat_method.LinkMethod(method.Get()); 2583 } 2584 2585 // Install entry point from interpreter. 2586 bool enter_interpreter = NeedsInterpreter(method.Get(), 2587 method->GetEntryPointFromQuickCompiledCode(), 2588 method->GetEntryPointFromPortableCompiledCode()); 2589 if (enter_interpreter && !method->IsNative()) { 2590 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2591 } else { 2592 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2593 } 2594 2595 if (method->IsAbstract()) { 2596 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2597 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2598 return; 2599 } 2600 2601 bool have_portable_code = false; 2602 if (method->IsStatic() && !method->IsConstructor()) { 2603 // For static methods excluding the class initializer, install the trampoline. 2604 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2605 // after initializing class (see ClassLinker::InitializeClass method). 2606 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2607 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2608 } else if (enter_interpreter) { 2609 if (!method->IsNative()) { 2610 // Set entry point from compiled code if there's no code or in interpreter only mode. 2611 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2612 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2613 } else { 2614 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2615 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2616 } 2617 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2618 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2619 have_portable_code = true; 2620 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2621 } else { 2622 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2623 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2624 } 2625 2626 if (method->IsNative()) { 2627 // Unregistering restores the dlsym lookup stub. 2628 method->UnregisterNative(Thread::Current()); 2629 2630 if (enter_interpreter) { 2631 // We have a native method here without code. Then it should have either the GenericJni 2632 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2633 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2634 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2635 } 2636 } 2637 2638 // Allow instrumentation its chance to hijack code. 2639 Runtime* runtime = Runtime::Current(); 2640 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2641 method->GetEntryPointFromQuickCompiledCode(), 2642 method->GetEntryPointFromPortableCompiledCode(), 2643 have_portable_code); 2644} 2645 2646void ClassLinker::LoadClass(const DexFile& dex_file, 2647 const DexFile::ClassDef& dex_class_def, 2648 Handle<mirror::Class> klass, 2649 mirror::ClassLoader* class_loader) { 2650 CHECK(klass.Get() != NULL); 2651 CHECK(klass->GetDexCache() != NULL); 2652 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2653 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2654 CHECK(descriptor != NULL); 2655 2656 klass->SetClass(GetClassRoot(kJavaLangClass)); 2657 if (kUseBakerOrBrooksReadBarrier) { 2658 klass->AssertReadBarrierPointer(); 2659 } 2660 uint32_t access_flags = dex_class_def.access_flags_; 2661 // Make sure that none of our runtime-only flags are set. 2662 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2663 klass->SetAccessFlags(access_flags); 2664 klass->SetClassLoader(class_loader); 2665 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2666 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2667 2668 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2669 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2670 2671 const byte* class_data = dex_file.GetClassData(dex_class_def); 2672 if (class_data == NULL) { 2673 return; // no fields or methods - for example a marker interface 2674 } 2675 2676 OatFile::OatClass oat_class; 2677 if (Runtime::Current()->IsStarted() 2678 && !Runtime::Current()->UseCompileTimeClassPath() 2679 && FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class)) { 2680 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2681 } else { 2682 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2683 } 2684} 2685 2686void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2687 const byte* class_data, 2688 Handle<mirror::Class> klass, 2689 mirror::ClassLoader* class_loader, 2690 const OatFile::OatClass* oat_class) { 2691 // Load fields. 2692 ClassDataItemIterator it(dex_file, class_data); 2693 Thread* self = Thread::Current(); 2694 if (it.NumStaticFields() != 0) { 2695 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2696 if (UNLIKELY(statics == NULL)) { 2697 CHECK(self->IsExceptionPending()); // OOME. 2698 return; 2699 } 2700 klass->SetSFields(statics); 2701 } 2702 if (it.NumInstanceFields() != 0) { 2703 mirror::ObjectArray<mirror::ArtField>* fields = 2704 AllocArtFieldArray(self, it.NumInstanceFields()); 2705 if (UNLIKELY(fields == NULL)) { 2706 CHECK(self->IsExceptionPending()); // OOME. 2707 return; 2708 } 2709 klass->SetIFields(fields); 2710 } 2711 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2712 StackHandleScope<1> hs(self); 2713 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2714 if (UNLIKELY(sfield.Get() == NULL)) { 2715 CHECK(self->IsExceptionPending()); // OOME. 2716 return; 2717 } 2718 klass->SetStaticField(i, sfield.Get()); 2719 LoadField(dex_file, it, klass, sfield); 2720 } 2721 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2722 StackHandleScope<1> hs(self); 2723 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2724 if (UNLIKELY(ifield.Get() == NULL)) { 2725 CHECK(self->IsExceptionPending()); // OOME. 2726 return; 2727 } 2728 klass->SetInstanceField(i, ifield.Get()); 2729 LoadField(dex_file, it, klass, ifield); 2730 } 2731 2732 // Load methods. 2733 if (it.NumDirectMethods() != 0) { 2734 // TODO: append direct methods to class object 2735 mirror::ObjectArray<mirror::ArtMethod>* directs = 2736 AllocArtMethodArray(self, it.NumDirectMethods()); 2737 if (UNLIKELY(directs == NULL)) { 2738 CHECK(self->IsExceptionPending()); // OOME. 2739 return; 2740 } 2741 klass->SetDirectMethods(directs); 2742 } 2743 if (it.NumVirtualMethods() != 0) { 2744 // TODO: append direct methods to class object 2745 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2746 AllocArtMethodArray(self, it.NumVirtualMethods()); 2747 if (UNLIKELY(virtuals == NULL)) { 2748 CHECK(self->IsExceptionPending()); // OOME. 2749 return; 2750 } 2751 klass->SetVirtualMethods(virtuals); 2752 } 2753 size_t class_def_method_index = 0; 2754 uint32_t last_dex_method_index = DexFile::kDexNoIndex; 2755 size_t last_class_def_method_index = 0; 2756 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2757 StackHandleScope<1> hs(self); 2758 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2759 if (UNLIKELY(method.Get() == NULL)) { 2760 CHECK(self->IsExceptionPending()); // OOME. 2761 return; 2762 } 2763 klass->SetDirectMethod(i, method.Get()); 2764 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2765 uint32_t it_method_index = it.GetMemberIndex(); 2766 if (last_dex_method_index == it_method_index) { 2767 // duplicate case 2768 method->SetMethodIndex(last_class_def_method_index); 2769 } else { 2770 method->SetMethodIndex(class_def_method_index); 2771 last_dex_method_index = it_method_index; 2772 last_class_def_method_index = class_def_method_index; 2773 } 2774 class_def_method_index++; 2775 } 2776 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2777 StackHandleScope<1> hs(self); 2778 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2779 if (UNLIKELY(method.Get() == NULL)) { 2780 CHECK(self->IsExceptionPending()); // OOME. 2781 return; 2782 } 2783 klass->SetVirtualMethod(i, method.Get()); 2784 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2785 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2786 class_def_method_index++; 2787 } 2788 DCHECK(!it.HasNext()); 2789} 2790 2791void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2792 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2793 uint32_t field_idx = it.GetMemberIndex(); 2794 dst->SetDexFieldIndex(field_idx); 2795 dst->SetDeclaringClass(klass.Get()); 2796 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2797} 2798 2799mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2800 const ClassDataItemIterator& it, 2801 Handle<mirror::Class> klass) { 2802 uint32_t dex_method_idx = it.GetMemberIndex(); 2803 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2804 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2805 2806 mirror::ArtMethod* dst = AllocArtMethod(self); 2807 if (UNLIKELY(dst == NULL)) { 2808 CHECK(self->IsExceptionPending()); // OOME. 2809 return NULL; 2810 } 2811 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2812 2813 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2814 dst->SetDexMethodIndex(dex_method_idx); 2815 dst->SetDeclaringClass(klass.Get()); 2816 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2817 2818 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2819 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2820 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2821 2822 uint32_t access_flags = it.GetMemberAccessFlags(); 2823 2824 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2825 // Set finalizable flag on declaring class. 2826 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2827 // Void return type. 2828 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged. 2829 klass->SetFinalizable(); 2830 } else { 2831 std::string temp; 2832 const char* klass_descriptor = klass->GetDescriptor(&temp); 2833 // The Enum class declares a "final" finalize() method to prevent subclasses from 2834 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2835 // subclasses, so we exclude it here. 2836 // We also want to avoid setting the flag on Object, where we know that finalize() is 2837 // empty. 2838 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2839 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2840 klass->SetFinalizable(); 2841 } 2842 } 2843 } 2844 } else if (method_name[0] == '<') { 2845 // Fix broken access flags for initializers. Bug 11157540. 2846 bool is_init = (strcmp("<init>", method_name) == 0); 2847 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2848 if (UNLIKELY(!is_init && !is_clinit)) { 2849 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2850 } else { 2851 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2852 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2853 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2854 access_flags |= kAccConstructor; 2855 } 2856 } 2857 } 2858 dst->SetAccessFlags(access_flags); 2859 2860 self->EndAssertNoThreadSuspension(old_cause); 2861 return dst; 2862} 2863 2864void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2865 Thread* self = Thread::Current(); 2866 StackHandleScope<1> hs(self); 2867 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2868 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2869 AppendToBootClassPath(dex_file, dex_cache); 2870} 2871 2872void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2873 Handle<mirror::DexCache> dex_cache) { 2874 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2875 boot_class_path_.push_back(&dex_file); 2876 RegisterDexFile(dex_file, dex_cache); 2877} 2878 2879bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2880 dex_lock_.AssertSharedHeld(Thread::Current()); 2881 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2882 mirror::DexCache* dex_cache = GetDexCache(i); 2883 if (dex_cache->GetDexFile() == &dex_file) { 2884 return true; 2885 } 2886 } 2887 return false; 2888} 2889 2890bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2891 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2892 return IsDexFileRegisteredLocked(dex_file); 2893} 2894 2895void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2896 Handle<mirror::DexCache> dex_cache) { 2897 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2898 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2899 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2900 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2901 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2902 dex_cache->SetDexFile(&dex_file); 2903 if (log_new_dex_caches_roots_) { 2904 // TODO: This is not safe if we can remove dex caches. 2905 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2906 } 2907} 2908 2909void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2910 Thread* self = Thread::Current(); 2911 { 2912 ReaderMutexLock mu(self, dex_lock_); 2913 if (IsDexFileRegisteredLocked(dex_file)) { 2914 return; 2915 } 2916 } 2917 // Don't alloc while holding the lock, since allocation may need to 2918 // suspend all threads and another thread may need the dex_lock_ to 2919 // get to a suspend point. 2920 StackHandleScope<1> hs(self); 2921 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2922 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2923 { 2924 WriterMutexLock mu(self, dex_lock_); 2925 if (IsDexFileRegisteredLocked(dex_file)) { 2926 return; 2927 } 2928 RegisterDexFileLocked(dex_file, dex_cache); 2929 } 2930} 2931 2932void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2933 Handle<mirror::DexCache> dex_cache) { 2934 WriterMutexLock mu(Thread::Current(), dex_lock_); 2935 RegisterDexFileLocked(dex_file, dex_cache); 2936} 2937 2938mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2939 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2940 // Search assuming unique-ness of dex file. 2941 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2942 mirror::DexCache* dex_cache = GetDexCache(i); 2943 if (dex_cache->GetDexFile() == &dex_file) { 2944 return dex_cache; 2945 } 2946 } 2947 // Search matching by location name. 2948 std::string location(dex_file.GetLocation()); 2949 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2950 mirror::DexCache* dex_cache = GetDexCache(i); 2951 if (dex_cache->GetDexFile()->GetLocation() == location) { 2952 return dex_cache; 2953 } 2954 } 2955 // Failure, dump diagnostic and abort. 2956 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2957 mirror::DexCache* dex_cache = GetDexCache(i); 2958 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2959 } 2960 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2961 return NULL; 2962} 2963 2964void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2965 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2966 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2967 mirror::DexCache* dex_cache = GetDexCache(i); 2968 dex_cache->Fixup(resolution_method); 2969 } 2970} 2971 2972mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2973 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 2974 if (UNLIKELY(klass == NULL)) { 2975 return NULL; 2976 } 2977 return InitializePrimitiveClass(klass, type); 2978} 2979 2980mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2981 Primitive::Type type) { 2982 CHECK(primitive_class != NULL); 2983 // Must hold lock on object when initializing. 2984 Thread* self = Thread::Current(); 2985 StackHandleScope<1> hs(self); 2986 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2987 ObjectLock<mirror::Class> lock(self, h_class); 2988 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2989 primitive_class->SetPrimitiveType(type); 2990 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2991 const char* descriptor = Primitive::Descriptor(type); 2992 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2993 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2994 return primitive_class; 2995} 2996 2997// Create an array class (i.e. the class object for the array, not the 2998// array itself). "descriptor" looks like "[C" or "[[[[B" or 2999// "[Ljava/lang/String;". 3000// 3001// If "descriptor" refers to an array of primitives, look up the 3002// primitive type's internally-generated class object. 3003// 3004// "class_loader" is the class loader of the class that's referring to 3005// us. It's used to ensure that we're looking for the element type in 3006// the right context. It does NOT become the class loader for the 3007// array class; that always comes from the base element class. 3008// 3009// Returns NULL with an exception raised on failure. 3010mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 3011 Handle<mirror::ClassLoader> class_loader) { 3012 // Identify the underlying component type 3013 CHECK_EQ('[', descriptor[0]); 3014 StackHandleScope<2> hs(self); 3015 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 3016 if (component_type.Get() == nullptr) { 3017 DCHECK(self->IsExceptionPending()); 3018 // We need to accept erroneous classes as component types. 3019 component_type.Assign(LookupClass(descriptor + 1, class_loader.Get())); 3020 if (component_type.Get() == nullptr) { 3021 DCHECK(self->IsExceptionPending()); 3022 return nullptr; 3023 } else { 3024 self->ClearException(); 3025 } 3026 } 3027 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 3028 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 3029 return nullptr; 3030 } 3031 // See if the component type is already loaded. Array classes are 3032 // always associated with the class loader of their underlying 3033 // element type -- an array of Strings goes with the loader for 3034 // java/lang/String -- so we need to look for it there. (The 3035 // caller should have checked for the existence of the class 3036 // before calling here, but they did so with *their* class loader, 3037 // not the component type's loader.) 3038 // 3039 // If we find it, the caller adds "loader" to the class' initiating 3040 // loader list, which should prevent us from going through this again. 3041 // 3042 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 3043 // are the same, because our caller (FindClass) just did the 3044 // lookup. (Even if we get this wrong we still have correct behavior, 3045 // because we effectively do this lookup again when we add the new 3046 // class to the hash table --- necessary because of possible races with 3047 // other threads.) 3048 if (class_loader.Get() != component_type->GetClassLoader()) { 3049 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 3050 if (new_class != NULL) { 3051 return new_class; 3052 } 3053 } 3054 3055 // Fill out the fields in the Class. 3056 // 3057 // It is possible to execute some methods against arrays, because 3058 // all arrays are subclasses of java_lang_Object_, so we need to set 3059 // up a vtable. We can just point at the one in java_lang_Object_. 3060 // 3061 // Array classes are simple enough that we don't need to do a full 3062 // link step. 3063 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 3064 if (UNLIKELY(!init_done_)) { 3065 // Classes that were hand created, ie not by FindSystemClass 3066 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 3067 new_class.Assign(GetClassRoot(kClassArrayClass)); 3068 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 3069 new_class.Assign(GetClassRoot(kObjectArrayClass)); 3070 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 3071 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 3072 } else if (strcmp(descriptor, 3073 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 3074 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 3075 } else if (strcmp(descriptor, 3076 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 3077 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 3078 } else if (strcmp(descriptor, "[C") == 0) { 3079 new_class.Assign(GetClassRoot(kCharArrayClass)); 3080 } else if (strcmp(descriptor, "[I") == 0) { 3081 new_class.Assign(GetClassRoot(kIntArrayClass)); 3082 } 3083 } 3084 if (new_class.Get() == nullptr) { 3085 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 3086 if (new_class.Get() == nullptr) { 3087 return nullptr; 3088 } 3089 new_class->SetComponentType(component_type.Get()); 3090 } 3091 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 3092 DCHECK(new_class->GetComponentType() != NULL); 3093 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 3094 new_class->SetSuperClass(java_lang_Object); 3095 new_class->SetVTable(java_lang_Object->GetVTable()); 3096 new_class->SetPrimitiveType(Primitive::kPrimNot); 3097 new_class->SetClassLoader(component_type->GetClassLoader()); 3098 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 3099 new_class->PopulateEmbeddedImtAndVTable(); 3100 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 3101 // don't need to set new_class->SetObjectSize(..) 3102 // because Object::SizeOf delegates to Array::SizeOf 3103 3104 3105 // All arrays have java/lang/Cloneable and java/io/Serializable as 3106 // interfaces. We need to set that up here, so that stuff like 3107 // "instanceof" works right. 3108 // 3109 // Note: The GC could run during the call to FindSystemClass, 3110 // so we need to make sure the class object is GC-valid while we're in 3111 // there. Do this by clearing the interface list so the GC will just 3112 // think that the entries are null. 3113 3114 3115 // Use the single, global copies of "interfaces" and "iftable" 3116 // (remember not to free them for arrays). 3117 { 3118 mirror::IfTable* array_iftable = array_iftable_.Read(); 3119 CHECK(array_iftable != nullptr); 3120 new_class->SetIfTable(array_iftable); 3121 } 3122 3123 // Inherit access flags from the component type. 3124 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 3125 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 3126 access_flags &= kAccJavaFlagsMask; 3127 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 3128 // and remove "interface". 3129 access_flags |= kAccAbstract | kAccFinal; 3130 access_flags &= ~kAccInterface; 3131 3132 new_class->SetAccessFlags(access_flags); 3133 3134 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 3135 if (existing == nullptr) { 3136 return new_class.Get(); 3137 } 3138 // Another thread must have loaded the class after we 3139 // started but before we finished. Abandon what we've 3140 // done. 3141 // 3142 // (Yes, this happens.) 3143 3144 return existing; 3145} 3146 3147mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 3148 switch (type) { 3149 case 'B': 3150 return GetClassRoot(kPrimitiveByte); 3151 case 'C': 3152 return GetClassRoot(kPrimitiveChar); 3153 case 'D': 3154 return GetClassRoot(kPrimitiveDouble); 3155 case 'F': 3156 return GetClassRoot(kPrimitiveFloat); 3157 case 'I': 3158 return GetClassRoot(kPrimitiveInt); 3159 case 'J': 3160 return GetClassRoot(kPrimitiveLong); 3161 case 'S': 3162 return GetClassRoot(kPrimitiveShort); 3163 case 'Z': 3164 return GetClassRoot(kPrimitiveBoolean); 3165 case 'V': 3166 return GetClassRoot(kPrimitiveVoid); 3167 default: 3168 break; 3169 } 3170 std::string printable_type(PrintableChar(type)); 3171 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 3172 return NULL; 3173} 3174 3175mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 3176 size_t hash) { 3177 if (VLOG_IS_ON(class_linker)) { 3178 mirror::DexCache* dex_cache = klass->GetDexCache(); 3179 std::string source; 3180 if (dex_cache != NULL) { 3181 source += " from "; 3182 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3183 } 3184 LOG(INFO) << "Loaded class " << descriptor << source; 3185 } 3186 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3187 mirror::Class* existing = 3188 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3189 if (existing != NULL) { 3190 return existing; 3191 } 3192 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == NULL && 3193 dex_cache_image_class_lookup_required_) { 3194 // Check a class loaded with the system class loader matches one in the image if the class 3195 // is in the image. 3196 existing = LookupClassFromImage(descriptor); 3197 if (existing != NULL) { 3198 CHECK(klass == existing); 3199 } 3200 } 3201 VerifyObject(klass); 3202 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3203 if (log_new_class_table_roots_) { 3204 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3205 } 3206 return NULL; 3207} 3208 3209mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3210 size_t hash) { 3211 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3212 mirror::Class* existing = 3213 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3214 3215 if (existing == nullptr) { 3216 CHECK(klass->IsProxyClass()); 3217 return nullptr; 3218 } 3219 3220 CHECK_NE(existing, klass) << descriptor; 3221 CHECK(!existing->IsResolved()) << descriptor; 3222 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3223 3224 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 3225 ++it) { 3226 mirror::Class* klass = it->second.Read(); 3227 if (klass == existing) { 3228 class_table_.erase(it); 3229 break; 3230 } 3231 } 3232 3233 CHECK(!klass->IsTemp()) << descriptor; 3234 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3235 dex_cache_image_class_lookup_required_) { 3236 // Check a class loaded with the system class loader matches one in the image if the class 3237 // is in the image. 3238 existing = LookupClassFromImage(descriptor); 3239 if (existing != nullptr) { 3240 CHECK(klass == existing) << descriptor; 3241 } 3242 } 3243 VerifyObject(klass); 3244 3245 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3246 if (log_new_class_table_roots_) { 3247 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3248 } 3249 3250 return existing; 3251} 3252 3253bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 3254 size_t hash = Hash(descriptor); 3255 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3256 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3257 it != end && it->first == hash; 3258 ++it) { 3259 mirror::Class* klass = it->second.Read(); 3260 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3261 class_table_.erase(it); 3262 return true; 3263 } 3264 } 3265 return false; 3266} 3267 3268mirror::Class* ClassLinker::LookupClass(const char* descriptor, 3269 const mirror::ClassLoader* class_loader) { 3270 size_t hash = Hash(descriptor); 3271 { 3272 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3273 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3274 if (result != NULL) { 3275 return result; 3276 } 3277 } 3278 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 3279 return NULL; 3280 } else { 3281 // Lookup failed but need to search dex_caches_. 3282 mirror::Class* result = LookupClassFromImage(descriptor); 3283 if (result != NULL) { 3284 InsertClass(descriptor, result, hash); 3285 } else { 3286 // Searching the image dex files/caches failed, we don't want to get into this situation 3287 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3288 // classes into the class table. 3289 constexpr uint32_t kMaxFailedDexCacheLookups = 1000; 3290 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3291 MoveImageClassesToClassTable(); 3292 } 3293 } 3294 return result; 3295 } 3296} 3297 3298mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3299 const mirror::ClassLoader* class_loader, 3300 size_t hash) { 3301 auto end = class_table_.end(); 3302 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3303 mirror::Class* klass = it->second.Read(); 3304 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3305 if (kIsDebugBuild) { 3306 // Check for duplicates in the table. 3307 for (++it; it != end && it->first == hash; ++it) { 3308 mirror::Class* klass2 = it->second.Read(); 3309 CHECK(!(klass2->GetClassLoader() == class_loader && 3310 klass2->DescriptorEquals(descriptor))) 3311 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3312 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3313 } 3314 } 3315 return klass; 3316 } 3317 } 3318 return NULL; 3319} 3320 3321static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3322 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3323 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3324 CHECK(image != NULL); 3325 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3326 return root->AsObjectArray<mirror::DexCache>(); 3327} 3328 3329void ClassLinker::MoveImageClassesToClassTable() { 3330 Thread* self = Thread::Current(); 3331 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3332 if (!dex_cache_image_class_lookup_required_) { 3333 return; // All dex cache classes are already in the class table. 3334 } 3335 const char* old_no_suspend_cause = 3336 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 3337 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3338 std::string temp; 3339 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3340 mirror::DexCache* dex_cache = dex_caches->Get(i); 3341 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3342 for (int32_t j = 0; j < types->GetLength(); j++) { 3343 mirror::Class* klass = types->Get(j); 3344 if (klass != NULL) { 3345 DCHECK(klass->GetClassLoader() == NULL); 3346 const char* descriptor = klass->GetDescriptor(&temp); 3347 size_t hash = Hash(descriptor); 3348 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 3349 if (existing != NULL) { 3350 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3351 << PrettyClassAndClassLoader(klass); 3352 } else { 3353 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3354 if (log_new_class_table_roots_) { 3355 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3356 } 3357 } 3358 } 3359 } 3360 } 3361 dex_cache_image_class_lookup_required_ = false; 3362 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3363} 3364 3365mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3366 Thread* self = Thread::Current(); 3367 const char* old_no_suspend_cause = 3368 self->StartAssertNoThreadSuspension("Image class lookup"); 3369 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3370 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3371 mirror::DexCache* dex_cache = dex_caches->Get(i); 3372 const DexFile* dex_file = dex_cache->GetDexFile(); 3373 // Try binary searching the string/type index. 3374 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3375 if (string_id != NULL) { 3376 const DexFile::TypeId* type_id = 3377 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3378 if (type_id != NULL) { 3379 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3380 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3381 if (klass != NULL) { 3382 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3383 return klass; 3384 } 3385 } 3386 } 3387 } 3388 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3389 return NULL; 3390} 3391 3392void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3393 result.clear(); 3394 if (dex_cache_image_class_lookup_required_) { 3395 MoveImageClassesToClassTable(); 3396 } 3397 size_t hash = Hash(descriptor); 3398 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3399 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3400 it != end && it->first == hash; ++it) { 3401 mirror::Class* klass = it->second.Read(); 3402 if (klass->DescriptorEquals(descriptor)) { 3403 result.push_back(klass); 3404 } 3405 } 3406} 3407 3408void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 3409 // TODO: assert that the monitor on the Class is held 3410 Thread* self = Thread::Current(); 3411 ObjectLock<mirror::Class> lock(self, klass); 3412 3413 // Don't attempt to re-verify if already sufficiently verified. 3414 if (klass->IsVerified()) { 3415 EnsurePreverifiedMethods(klass); 3416 return; 3417 } 3418 if (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler()) { 3419 return; 3420 } 3421 3422 // The class might already be erroneous, for example at compile time if we attempted to verify 3423 // this class as a parent to another. 3424 if (klass->IsErroneous()) { 3425 ThrowEarlierClassFailure(klass.Get()); 3426 return; 3427 } 3428 3429 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3430 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3431 } else { 3432 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3433 << PrettyClass(klass.Get()); 3434 CHECK(!Runtime::Current()->IsCompiler()); 3435 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3436 } 3437 3438 // Skip verification if disabled. 3439 if (!Runtime::Current()->IsVerificationEnabled()) { 3440 klass->SetStatus(mirror::Class::kStatusVerified, self); 3441 EnsurePreverifiedMethods(klass); 3442 return; 3443 } 3444 3445 // Verify super class. 3446 StackHandleScope<2> hs(self); 3447 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3448 if (super.Get() != NULL) { 3449 // Acquire lock to prevent races on verifying the super class. 3450 ObjectLock<mirror::Class> lock(self, super); 3451 3452 if (!super->IsVerified() && !super->IsErroneous()) { 3453 VerifyClass(super); 3454 } 3455 if (!super->IsCompileTimeVerified()) { 3456 std::string error_msg( 3457 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3458 PrettyDescriptor(klass.Get()).c_str(), 3459 PrettyDescriptor(super.Get()).c_str())); 3460 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3461 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3462 if (cause.Get() != nullptr) { 3463 self->ClearException(); 3464 } 3465 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3466 if (cause.Get() != nullptr) { 3467 self->GetException(nullptr)->SetCause(cause.Get()); 3468 } 3469 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3470 if (Runtime::Current()->IsCompiler()) { 3471 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3472 } 3473 klass->SetStatus(mirror::Class::kStatusError, self); 3474 return; 3475 } 3476 } 3477 3478 // Try to use verification information from the oat file, otherwise do runtime verification. 3479 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3480 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3481 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3482 if (oat_file_class_status == mirror::Class::kStatusError) { 3483 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3484 << PrettyDescriptor(klass.Get()) << " in " 3485 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3486 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3487 PrettyDescriptor(klass.Get()).c_str()); 3488 klass->SetStatus(mirror::Class::kStatusError, self); 3489 return; 3490 } 3491 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3492 std::string error_msg; 3493 if (!preverified) { 3494 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 3495 Runtime::Current()->IsCompiler(), 3496 &error_msg); 3497 } 3498 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3499 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3500 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3501 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3502 << " because: " << error_msg; 3503 } 3504 self->AssertNoPendingException(); 3505 // Make sure all classes referenced by catch blocks are resolved. 3506 ResolveClassExceptionHandlerTypes(dex_file, klass); 3507 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3508 // Even though there were no verifier failures we need to respect whether the super-class 3509 // was verified or requiring runtime reverification. 3510 if (super.Get() == NULL || super->IsVerified()) { 3511 klass->SetStatus(mirror::Class::kStatusVerified, self); 3512 } else { 3513 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3514 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3515 // Pretend a soft failure occured so that we don't consider the class verified below. 3516 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3517 } 3518 } else { 3519 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3520 // Soft failures at compile time should be retried at runtime. Soft 3521 // failures at runtime will be handled by slow paths in the generated 3522 // code. Set status accordingly. 3523 if (Runtime::Current()->IsCompiler()) { 3524 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3525 } else { 3526 klass->SetStatus(mirror::Class::kStatusVerified, self); 3527 // As this is a fake verified status, make sure the methods are _not_ marked preverified 3528 // later. 3529 klass->SetAccessFlags(klass->GetAccessFlags() | kAccPreverified); 3530 } 3531 } 3532 } else { 3533 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3534 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3535 << " because: " << error_msg; 3536 self->AssertNoPendingException(); 3537 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3538 klass->SetStatus(mirror::Class::kStatusError, self); 3539 } 3540 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3541 // Class is verified so we don't need to do any access check on its methods. 3542 // Let the interpreter know it by setting the kAccPreverified flag onto each 3543 // method. 3544 // Note: we're going here during compilation and at runtime. When we set the 3545 // kAccPreverified flag when compiling image classes, the flag is recorded 3546 // in the image and is set when loading the image. 3547 EnsurePreverifiedMethods(klass); 3548 } 3549} 3550 3551void ClassLinker::EnsurePreverifiedMethods(Handle<mirror::Class> klass) { 3552 if ((klass->GetAccessFlags() & kAccPreverified) == 0) { 3553 klass->SetPreverifiedFlagOnAllMethods(); 3554 klass->SetAccessFlags(klass->GetAccessFlags() | kAccPreverified); 3555 } 3556} 3557 3558bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3559 mirror::Class::Status& oat_file_class_status) { 3560 // If we're compiling, we can only verify the class using the oat file if 3561 // we are not compiling the image or if the class we're verifying is not part of 3562 // the app. In other words, we will only check for preverification of bootclasspath 3563 // classes. 3564 if (Runtime::Current()->IsCompiler()) { 3565 // Are we compiling the bootclasspath? 3566 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3567 return false; 3568 } 3569 // We are compiling an app (not the image). 3570 3571 // Is this an app class? (I.e. not a bootclasspath class) 3572 if (klass->GetClassLoader() != NULL) { 3573 return false; 3574 } 3575 } 3576 3577 const OatFile::OatDexFile* oat_dex_file = FindOpenedOatDexFileForDexFile(dex_file); 3578 // Make this work with gtests, which do not set up the image properly. 3579 // TODO: we should clean up gtests to set up the image path properly. 3580 if (Runtime::Current()->IsCompiler() || (oat_dex_file == nullptr)) { 3581 return false; 3582 } 3583 3584 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3585 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3586 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3587 if (oat_file_class_status == mirror::Class::kStatusVerified || 3588 oat_file_class_status == mirror::Class::kStatusInitialized) { 3589 return true; 3590 } 3591 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3592 // Compile time verification failed with a soft error. Compile time verification can fail 3593 // because we have incomplete type information. Consider the following: 3594 // class ... { 3595 // Foo x; 3596 // .... () { 3597 // if (...) { 3598 // v1 gets assigned a type of resolved class Foo 3599 // } else { 3600 // v1 gets assigned a type of unresolved class Bar 3601 // } 3602 // iput x = v1 3603 // } } 3604 // when we merge v1 following the if-the-else it results in Conflict 3605 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3606 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3607 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3608 // at compile time). 3609 return false; 3610 } 3611 if (oat_file_class_status == mirror::Class::kStatusError) { 3612 // Compile time verification failed with a hard error. This is caused by invalid instructions 3613 // in the class. These errors are unrecoverable. 3614 return false; 3615 } 3616 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3617 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3618 // not loading the class. 3619 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3620 // isn't a problem and this case shouldn't occur 3621 return false; 3622 } 3623 std::string temp; 3624 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3625 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3626 << klass->GetDescriptor(&temp); 3627 3628 return false; 3629} 3630 3631void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3632 Handle<mirror::Class> klass) { 3633 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3634 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3635 } 3636 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3637 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3638 } 3639} 3640 3641void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3642 mirror::ArtMethod* method) { 3643 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3644 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3645 if (code_item == NULL) { 3646 return; // native or abstract method 3647 } 3648 if (code_item->tries_size_ == 0) { 3649 return; // nothing to process 3650 } 3651 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3652 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3653 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3654 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3655 CatchHandlerIterator iterator(handlers_ptr); 3656 for (; iterator.HasNext(); iterator.Next()) { 3657 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3658 // unresolved exception types will be ignored by exception delivery 3659 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3660 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3661 if (exception_type == NULL) { 3662 DCHECK(Thread::Current()->IsExceptionPending()); 3663 Thread::Current()->ClearException(); 3664 } 3665 } 3666 } 3667 handlers_ptr = iterator.EndDataPointer(); 3668 } 3669} 3670 3671static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3672static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3673 Handle<mirror::ArtMethod> prototype); 3674 3675mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3676 jobjectArray interfaces, jobject loader, 3677 jobjectArray methods, jobjectArray throws) { 3678 Thread* self = soa.Self(); 3679 StackHandleScope<8> hs(self); 3680 Handle<mirror::Class> klass(hs.NewHandle( 3681 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3682 if (klass.Get() == NULL) { 3683 CHECK(self->IsExceptionPending()); // OOME. 3684 return NULL; 3685 } 3686 DCHECK(klass->GetClass() != NULL); 3687 klass->SetObjectSize(sizeof(mirror::Proxy)); 3688 // Set the class access flags incl. preverified, so we do not try to set the flag on the methods. 3689 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal | kAccPreverified); 3690 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3691 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3692 klass->SetName(soa.Decode<mirror::String*>(name)); 3693 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3694 klass->SetDexCache(proxy_class->GetDexCache()); 3695 klass->SetStatus(mirror::Class::kStatusIdx, self); 3696 3697 // Instance fields are inherited, but we add a couple of static fields... 3698 { 3699 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3700 if (UNLIKELY(sfields == NULL)) { 3701 CHECK(self->IsExceptionPending()); // OOME. 3702 return NULL; 3703 } 3704 klass->SetSFields(sfields); 3705 } 3706 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3707 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3708 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3709 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3710 CHECK(self->IsExceptionPending()); // OOME. 3711 return nullptr; 3712 } 3713 klass->SetStaticField(0, interfaces_sfield.Get()); 3714 interfaces_sfield->SetDexFieldIndex(0); 3715 interfaces_sfield->SetDeclaringClass(klass.Get()); 3716 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3717 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3718 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3719 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3720 CHECK(self->IsExceptionPending()); // OOME. 3721 return nullptr; 3722 } 3723 klass->SetStaticField(1, throws_sfield.Get()); 3724 throws_sfield->SetDexFieldIndex(1); 3725 throws_sfield->SetDeclaringClass(klass.Get()); 3726 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3727 3728 // Proxies have 1 direct method, the constructor 3729 { 3730 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3731 if (UNLIKELY(directs == nullptr)) { 3732 CHECK(self->IsExceptionPending()); // OOME. 3733 return nullptr; 3734 } 3735 klass->SetDirectMethods(directs); 3736 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3737 if (UNLIKELY(constructor == nullptr)) { 3738 CHECK(self->IsExceptionPending()); // OOME. 3739 return nullptr; 3740 } 3741 klass->SetDirectMethod(0, constructor); 3742 } 3743 3744 // Create virtual method using specified prototypes. 3745 size_t num_virtual_methods = 3746 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3747 { 3748 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3749 num_virtual_methods); 3750 if (UNLIKELY(virtuals == NULL)) { 3751 CHECK(self->IsExceptionPending()); // OOME. 3752 return NULL; 3753 } 3754 klass->SetVirtualMethods(virtuals); 3755 } 3756 for (size_t i = 0; i < num_virtual_methods; ++i) { 3757 StackHandleScope<1> hs(self); 3758 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3759 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3760 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3761 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3762 if (UNLIKELY(clone == nullptr)) { 3763 CHECK(self->IsExceptionPending()); // OOME. 3764 return nullptr; 3765 } 3766 klass->SetVirtualMethod(i, clone); 3767 } 3768 3769 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3770 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3771 self->AssertNoPendingException(); 3772 3773 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3774 mirror::Class* new_class = nullptr; 3775 { 3776 ObjectLock<mirror::Class> resolution_lock(self, klass); // Must hold lock on object when resolved. 3777 // Link the fields and virtual methods, creating vtable and iftables 3778 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3779 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3780 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3781 klass->SetStatus(mirror::Class::kStatusError, self); 3782 return nullptr; 3783 } 3784 } 3785 3786 CHECK(klass->IsRetired()); 3787 CHECK_NE(klass.Get(), new_class); 3788 klass.Assign(new_class); 3789 3790 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3791 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3792 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3793 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3794 3795 { 3796 // Lock on klass is released. Lock new class object. 3797 ObjectLock<mirror::Class> initialization_lock(self, klass); 3798 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3799 } 3800 3801 // sanity checks 3802 if (kIsDebugBuild) { 3803 CHECK(klass->GetIFields() == nullptr); 3804 CheckProxyConstructor(klass->GetDirectMethod(0)); 3805 for (size_t i = 0; i < num_virtual_methods; ++i) { 3806 StackHandleScope<2> hs(self); 3807 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3808 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3809 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3810 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3811 CheckProxyMethod(virtual_method, prototype); 3812 } 3813 3814 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3815 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3816 decoded_name->ToModifiedUtf8().c_str())); 3817 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3818 3819 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3820 decoded_name->ToModifiedUtf8().c_str())); 3821 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3822 3823 CHECK_EQ(klass.Get()->GetInterfaces(), 3824 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3825 CHECK_EQ(klass.Get()->GetThrows(), 3826 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3827 } 3828 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3829 CHECK(existing == nullptr); 3830 return klass.Get(); 3831} 3832 3833std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3834 DCHECK(proxy_class->IsProxyClass()); 3835 mirror::String* name = proxy_class->GetName(); 3836 DCHECK(name != NULL); 3837 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3838} 3839 3840mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3841 mirror::ArtMethod* proxy_method) { 3842 DCHECK(proxy_class->IsProxyClass()); 3843 DCHECK(proxy_method->IsProxyMethod()); 3844 // Locate the dex cache of the original interface/Object 3845 mirror::DexCache* dex_cache = nullptr; 3846 { 3847 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3848 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3849 mirror::DexCache* a_dex_cache = GetDexCache(i); 3850 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3851 dex_cache = a_dex_cache; 3852 break; 3853 } 3854 } 3855 } 3856 CHECK(dex_cache != nullptr); 3857 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3858 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3859 CHECK(resolved_method != nullptr); 3860 return resolved_method; 3861} 3862 3863 3864mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3865 Handle<mirror::Class> klass, 3866 mirror::Class* proxy_class) { 3867 // Create constructor for Proxy that must initialize h 3868 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3869 proxy_class->GetDirectMethods(); 3870 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3871 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3872 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 3873 // constructor method. 3874 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 3875 proxy_constructor); 3876 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3877 // code_ too) 3878 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3879 if (constructor == nullptr) { 3880 CHECK(self->IsExceptionPending()); // OOME. 3881 return nullptr; 3882 } 3883 // Make this constructor public and fix the class to be our Proxy version 3884 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3885 constructor->SetDeclaringClass(klass.Get()); 3886 return constructor; 3887} 3888 3889static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3890 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3891 CHECK(constructor->IsConstructor()); 3892 CHECK_STREQ(constructor->GetName(), "<init>"); 3893 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3894 "(Ljava/lang/reflect/InvocationHandler;)V"); 3895 DCHECK(constructor->IsPublic()); 3896} 3897 3898mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3899 Handle<mirror::Class> klass, 3900 Handle<mirror::ArtMethod> prototype) { 3901 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3902 // prototype method 3903 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3904 prototype.Get()); 3905 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3906 // as necessary 3907 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3908 if (UNLIKELY(method == NULL)) { 3909 CHECK(self->IsExceptionPending()); // OOME. 3910 return NULL; 3911 } 3912 3913 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3914 // the intersection of throw exceptions as defined in Proxy 3915 method->SetDeclaringClass(klass.Get()); 3916 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3917 3918 // At runtime the method looks like a reference and argument saving method, clone the code 3919 // related parameters from this method. 3920 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3921 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3922 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3923 3924 return method; 3925} 3926 3927static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3928 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3929 // Basic sanity 3930 CHECK(!prototype->IsFinal()); 3931 CHECK(method->IsFinal()); 3932 CHECK(!method->IsAbstract()); 3933 3934 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3935 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3936 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3937 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 3938 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 3939 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3940 3941 MethodHelper mh(method); 3942 MethodHelper mh2(prototype); 3943 CHECK_STREQ(method->GetName(), prototype->GetName()); 3944 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3945 // More complex sanity - via dex cache 3946 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3947} 3948 3949static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3950 bool can_init_parents) 3951 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3952 if (can_init_statics && can_init_parents) { 3953 return true; 3954 } 3955 if (!can_init_statics) { 3956 // Check if there's a class initializer. 3957 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3958 if (clinit != NULL) { 3959 return false; 3960 } 3961 // Check if there are encoded static values needing initialization. 3962 if (klass->NumStaticFields() != 0) { 3963 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3964 DCHECK(dex_class_def != NULL); 3965 if (dex_class_def->static_values_off_ != 0) { 3966 return false; 3967 } 3968 } 3969 } 3970 if (!klass->IsInterface() && klass->HasSuperClass()) { 3971 mirror::Class* super_class = klass->GetSuperClass(); 3972 if (!can_init_parents && !super_class->IsInitialized()) { 3973 return false; 3974 } else { 3975 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3976 return false; 3977 } 3978 } 3979 } 3980 return true; 3981} 3982 3983bool ClassLinker::IsInitialized() const { 3984 return init_done_; 3985} 3986 3987bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3988 bool can_init_parents) { 3989 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3990 3991 // Are we already initialized and therefore done? 3992 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3993 // an initialized class will never change its state. 3994 if (klass->IsInitialized()) { 3995 return true; 3996 } 3997 3998 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3999 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 4000 return false; 4001 } 4002 4003 Thread* self = Thread::Current(); 4004 uint64_t t0; 4005 { 4006 ObjectLock<mirror::Class> lock(self, klass); 4007 4008 // Re-check under the lock in case another thread initialized ahead of us. 4009 if (klass->IsInitialized()) { 4010 return true; 4011 } 4012 4013 // Was the class already found to be erroneous? Done under the lock to match the JLS. 4014 if (klass->IsErroneous()) { 4015 ThrowEarlierClassFailure(klass.Get()); 4016 return false; 4017 } 4018 4019 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 4020 4021 if (!klass->IsVerified()) { 4022 VerifyClass(klass); 4023 if (!klass->IsVerified()) { 4024 // We failed to verify, expect either the klass to be erroneous or verification failed at 4025 // compile time. 4026 if (klass->IsErroneous()) { 4027 CHECK(self->IsExceptionPending()); 4028 } else { 4029 CHECK(Runtime::Current()->IsCompiler()); 4030 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 4031 } 4032 return false; 4033 } else { 4034 self->AssertNoPendingException(); 4035 } 4036 } 4037 4038 // If the class is kStatusInitializing, either this thread is 4039 // initializing higher up the stack or another thread has beat us 4040 // to initializing and we need to wait. Either way, this 4041 // invocation of InitializeClass will not be responsible for 4042 // running <clinit> and will return. 4043 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4044 // Could have got an exception during verification. 4045 if (self->IsExceptionPending()) { 4046 return false; 4047 } 4048 // We caught somebody else in the act; was it us? 4049 if (klass->GetClinitThreadId() == self->GetTid()) { 4050 // Yes. That's fine. Return so we can continue initializing. 4051 return true; 4052 } 4053 // No. That's fine. Wait for another thread to finish initializing. 4054 return WaitForInitializeClass(klass, self, lock); 4055 } 4056 4057 if (!ValidateSuperClassDescriptors(klass)) { 4058 klass->SetStatus(mirror::Class::kStatusError, self); 4059 return false; 4060 } 4061 4062 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 4063 4064 // From here out other threads may observe that we're initializing and so changes of state 4065 // require the a notification. 4066 klass->SetClinitThreadId(self->GetTid()); 4067 klass->SetStatus(mirror::Class::kStatusInitializing, self); 4068 4069 t0 = NanoTime(); 4070 } 4071 4072 // Initialize super classes, must be done while initializing for the JLS. 4073 if (!klass->IsInterface() && klass->HasSuperClass()) { 4074 mirror::Class* super_class = klass->GetSuperClass(); 4075 if (!super_class->IsInitialized()) { 4076 CHECK(!super_class->IsInterface()); 4077 CHECK(can_init_parents); 4078 StackHandleScope<1> hs(self); 4079 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 4080 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 4081 if (!super_initialized) { 4082 // The super class was verified ahead of entering initializing, we should only be here if 4083 // the super class became erroneous due to initialization. 4084 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 4085 << "Super class initialization failed for " 4086 << PrettyDescriptor(handle_scope_super.Get()) 4087 << " that has unexpected status " << handle_scope_super->GetStatus() 4088 << "\nPending exception:\n" 4089 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 4090 ObjectLock<mirror::Class> lock(self, klass); 4091 // Initialization failed because the super-class is erroneous. 4092 klass->SetStatus(mirror::Class::kStatusError, self); 4093 return false; 4094 } 4095 } 4096 } 4097 4098 if (klass->NumStaticFields() > 0) { 4099 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 4100 CHECK(dex_class_def != NULL); 4101 const DexFile& dex_file = klass->GetDexFile(); 4102 StackHandleScope<2> hs(self); 4103 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 4104 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 4105 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 4106 this, *dex_class_def); 4107 if (it.HasNext()) { 4108 CHECK(can_init_statics); 4109 // We reordered the fields, so we need to be able to map the 4110 // field indexes to the right fields. 4111 SafeMap<uint32_t, mirror::ArtField*> field_map; 4112 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 4113 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 4114 if (Runtime::Current()->IsActiveTransaction()) { 4115 it.ReadValueToField<true>(field_map.Get(i)); 4116 } else { 4117 it.ReadValueToField<false>(field_map.Get(i)); 4118 } 4119 } 4120 } 4121 } 4122 4123 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 4124 if (clinit != NULL) { 4125 CHECK(can_init_statics); 4126 JValue result; 4127 clinit->Invoke(self, NULL, 0, &result, "V"); 4128 } 4129 4130 uint64_t t1 = NanoTime(); 4131 4132 bool success = true; 4133 { 4134 ObjectLock<mirror::Class> lock(self, klass); 4135 4136 if (self->IsExceptionPending()) { 4137 WrapExceptionInInitializer(); 4138 klass->SetStatus(mirror::Class::kStatusError, self); 4139 success = false; 4140 } else { 4141 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 4142 RuntimeStats* thread_stats = self->GetStats(); 4143 ++global_stats->class_init_count; 4144 ++thread_stats->class_init_count; 4145 global_stats->class_init_time_ns += (t1 - t0); 4146 thread_stats->class_init_time_ns += (t1 - t0); 4147 // Set the class as initialized except if failed to initialize static fields. 4148 klass->SetStatus(mirror::Class::kStatusInitialized, self); 4149 if (VLOG_IS_ON(class_linker)) { 4150 std::string temp; 4151 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 4152 klass->GetLocation(); 4153 } 4154 // Opportunistically set static method trampolines to their destination. 4155 FixupStaticTrampolines(klass.Get()); 4156 } 4157 } 4158 return success; 4159} 4160 4161bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 4162 ObjectLock<mirror::Class>& lock) 4163 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4164 while (true) { 4165 self->AssertNoPendingException(); 4166 CHECK(!klass->IsInitialized()); 4167 lock.WaitIgnoringInterrupts(); 4168 4169 // When we wake up, repeat the test for init-in-progress. If 4170 // there's an exception pending (only possible if 4171 // "interruptShouldThrow" was set), bail out. 4172 if (self->IsExceptionPending()) { 4173 WrapExceptionInInitializer(); 4174 klass->SetStatus(mirror::Class::kStatusError, self); 4175 return false; 4176 } 4177 // Spurious wakeup? Go back to waiting. 4178 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4179 continue; 4180 } 4181 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 4182 // Compile time initialization failed. 4183 return false; 4184 } 4185 if (klass->IsErroneous()) { 4186 // The caller wants an exception, but it was thrown in a 4187 // different thread. Synthesize one here. 4188 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 4189 PrettyDescriptor(klass.Get()).c_str()); 4190 return false; 4191 } 4192 if (klass->IsInitialized()) { 4193 return true; 4194 } 4195 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4196 << klass->GetStatus(); 4197 } 4198 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 4199} 4200 4201bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 4202 if (klass->IsInterface()) { 4203 return true; 4204 } 4205 // Begin with the methods local to the superclass. 4206 StackHandleScope<2> hs(Thread::Current()); 4207 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4208 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4209 if (klass->HasSuperClass() && 4210 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4211 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4212 mh.ChangeMethod(klass->GetVTableEntry(i)); 4213 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 4214 if (mh.GetMethod() != super_mh.GetMethod() && 4215 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4216 ThrowLinkageError(klass.Get(), 4217 "Class %s method %s resolves differently in superclass %s", 4218 PrettyDescriptor(klass.Get()).c_str(), 4219 PrettyMethod(mh.GetMethod()).c_str(), 4220 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4221 return false; 4222 } 4223 } 4224 } 4225 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4226 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4227 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4228 for (uint32_t j = 0; j < num_methods; ++j) { 4229 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4230 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4231 if (mh.GetMethod() != super_mh.GetMethod() && 4232 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4233 ThrowLinkageError(klass.Get(), 4234 "Class %s method %s resolves differently in interface %s", 4235 PrettyDescriptor(klass.Get()).c_str(), 4236 PrettyMethod(mh.GetMethod()).c_str(), 4237 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4238 return false; 4239 } 4240 } 4241 } 4242 } 4243 return true; 4244} 4245 4246bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 4247 bool can_init_parents) { 4248 DCHECK(c.Get() != nullptr); 4249 if (c->IsInitialized()) { 4250 EnsurePreverifiedMethods(c); 4251 return true; 4252 } 4253 const bool success = InitializeClass(c, can_init_fields, can_init_parents); 4254 Thread* self = Thread::Current(); 4255 if (!success) { 4256 if (can_init_fields && can_init_parents) { 4257 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4258 } 4259 } else { 4260 self->AssertNoPendingException(); 4261 } 4262 return success; 4263} 4264 4265void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 4266 mirror::Class* c, 4267 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 4268 const byte* class_data = dex_file.GetClassData(dex_class_def); 4269 ClassDataItemIterator it(dex_file, class_data); 4270 StackHandleScope<2> hs(Thread::Current()); 4271 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 4272 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 4273 CHECK(!kMovingFields); 4274 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 4275 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 4276 } 4277} 4278 4279void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4280 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4281 if (fields != nullptr) { 4282 for (int index = 0; index < fields->GetLength(); index ++) { 4283 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4284 fields->Get(index)->SetDeclaringClass(new_class); 4285 } 4286 } 4287 } 4288 4289 fields = new_class->GetSFields(); 4290 if (fields != nullptr) { 4291 for (int index = 0; index < fields->GetLength(); index ++) { 4292 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4293 fields->Get(index)->SetDeclaringClass(new_class); 4294 } 4295 } 4296 } 4297 4298 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4299 if (methods != nullptr) { 4300 for (int index = 0; index < methods->GetLength(); index ++) { 4301 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4302 methods->Get(index)->SetDeclaringClass(new_class); 4303 } 4304 } 4305 } 4306 4307 methods = new_class->GetVirtualMethods(); 4308 if (methods != nullptr) { 4309 for (int index = 0; index < methods->GetLength(); index ++) { 4310 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4311 methods->Get(index)->SetDeclaringClass(new_class); 4312 } 4313 } 4314 } 4315} 4316 4317bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4318 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4319 mirror::Class** new_class) { 4320 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4321 4322 if (!LinkSuperClass(klass)) { 4323 return false; 4324 } 4325 if (!LinkMethods(self, klass, interfaces)) { 4326 return false; 4327 } 4328 if (!LinkInstanceFields(klass)) { 4329 return false; 4330 } 4331 size_t class_size; 4332 if (!LinkStaticFields(klass, &class_size)) { 4333 return false; 4334 } 4335 CreateReferenceInstanceOffsets(klass); 4336 CreateReferenceStaticOffsets(klass); 4337 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4338 4339 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4340 // We don't need to retire this class as it has no embedded tables or it was created the 4341 // correct size during class linker initialization. 4342 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4343 4344 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4345 klass->PopulateEmbeddedImtAndVTable(); 4346 } 4347 4348 // This will notify waiters on klass that saw the not yet resolved 4349 // class in the class_table_ during EnsureResolved. 4350 klass->SetStatus(mirror::Class::kStatusResolved, self); 4351 *new_class = klass.Get(); 4352 } else { 4353 CHECK(!klass->IsResolved()); 4354 // Retire the temporary class and create the correctly sized resolved class. 4355 *new_class = klass->CopyOf(self, class_size); 4356 if (UNLIKELY(*new_class == NULL)) { 4357 CHECK(self->IsExceptionPending()); // Expect an OOME. 4358 klass->SetStatus(mirror::Class::kStatusError, self); 4359 return false; 4360 } 4361 4362 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4363 StackHandleScope<1> hs(self); 4364 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4365 ObjectLock<mirror::Class> lock(self, new_class_h); 4366 4367 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4368 4369 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4370 CHECK(existing == NULL || existing == klass.Get()); 4371 4372 // This will notify waiters on temp class that saw the not yet resolved class in the 4373 // class_table_ during EnsureResolved. 4374 klass->SetStatus(mirror::Class::kStatusRetired, self); 4375 4376 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4377 // This will notify waiters on new_class that saw the not yet resolved 4378 // class in the class_table_ during EnsureResolved. 4379 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4380 } 4381 return true; 4382} 4383 4384bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4385 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4386 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4387 uint16_t super_class_idx = class_def.superclass_idx_; 4388 if (super_class_idx != DexFile::kDexNoIndex16) { 4389 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4390 if (super_class == NULL) { 4391 DCHECK(Thread::Current()->IsExceptionPending()); 4392 return false; 4393 } 4394 // Verify 4395 if (!klass->CanAccess(super_class)) { 4396 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4397 PrettyDescriptor(super_class).c_str(), 4398 PrettyDescriptor(klass.Get()).c_str()); 4399 return false; 4400 } 4401 CHECK(super_class->IsResolved()); 4402 klass->SetSuperClass(super_class); 4403 } 4404 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4405 if (interfaces != NULL) { 4406 for (size_t i = 0; i < interfaces->Size(); i++) { 4407 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4408 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4409 if (interface == NULL) { 4410 DCHECK(Thread::Current()->IsExceptionPending()); 4411 return false; 4412 } 4413 // Verify 4414 if (!klass->CanAccess(interface)) { 4415 // TODO: the RI seemed to ignore this in my testing. 4416 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4417 PrettyDescriptor(interface).c_str(), 4418 PrettyDescriptor(klass.Get()).c_str()); 4419 return false; 4420 } 4421 } 4422 } 4423 // Mark the class as loaded. 4424 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 4425 return true; 4426} 4427 4428bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4429 CHECK(!klass->IsPrimitive()); 4430 mirror::Class* super = klass->GetSuperClass(); 4431 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4432 if (super != NULL) { 4433 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4434 return false; 4435 } 4436 return true; 4437 } 4438 if (super == NULL) { 4439 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4440 PrettyDescriptor(klass.Get()).c_str()); 4441 return false; 4442 } 4443 // Verify 4444 if (super->IsFinal() || super->IsInterface()) { 4445 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4446 PrettyDescriptor(super).c_str(), 4447 PrettyDescriptor(klass.Get()).c_str(), 4448 super->IsFinal() ? "declared final" : "an interface"); 4449 return false; 4450 } 4451 if (!klass->CanAccess(super)) { 4452 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4453 PrettyDescriptor(super).c_str(), 4454 PrettyDescriptor(klass.Get()).c_str()); 4455 return false; 4456 } 4457 4458 // Inherit kAccClassIsFinalizable from the superclass in case this 4459 // class doesn't override finalize. 4460 if (super->IsFinalizable()) { 4461 klass->SetFinalizable(); 4462 } 4463 4464 // Inherit reference flags (if any) from the superclass. 4465 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4466 if (reference_flags != 0) { 4467 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4468 } 4469 // Disallow custom direct subclasses of java.lang.ref.Reference. 4470 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4471 ThrowLinkageError(klass.Get(), 4472 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4473 PrettyDescriptor(klass.Get()).c_str()); 4474 return false; 4475 } 4476 4477 if (kIsDebugBuild) { 4478 // Ensure super classes are fully resolved prior to resolving fields.. 4479 while (super != NULL) { 4480 CHECK(super->IsResolved()); 4481 super = super->GetSuperClass(); 4482 } 4483 } 4484 return true; 4485} 4486 4487// Populate the class vtable and itable. Compute return type indices. 4488bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4489 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4490 if (klass->IsInterface()) { 4491 // No vtable. 4492 size_t count = klass->NumVirtualMethods(); 4493 if (!IsUint(16, count)) { 4494 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4495 return false; 4496 } 4497 for (size_t i = 0; i < count; ++i) { 4498 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4499 } 4500 // Link interface method tables 4501 return LinkInterfaceMethods(klass, interfaces); 4502 } else { 4503 // Link virtual and interface method tables 4504 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4505 } 4506 return true; 4507} 4508 4509bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4510 if (klass->HasSuperClass()) { 4511 uint32_t max_count = klass->NumVirtualMethods() + 4512 klass->GetSuperClass()->GetVTableLength(); 4513 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4514 CHECK_LE(actual_count, max_count); 4515 StackHandleScope<4> hs(self); 4516 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4517 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4518 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4519 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4520 if (UNLIKELY(vtable.Get() == nullptr)) { 4521 CHECK(self->IsExceptionPending()); // OOME. 4522 return false; 4523 } 4524 int len = super_class->GetVTableLength(); 4525 for (int i = 0; i < len; i++) { 4526 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4527 } 4528 } else { 4529 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4530 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4531 if (UNLIKELY(vtable.Get() == nullptr)) { 4532 CHECK(self->IsExceptionPending()); // OOME. 4533 return false; 4534 } 4535 } 4536 4537 // See if any of our virtual methods override the superclass. 4538 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4539 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4540 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4541 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4542 local_mh.ChangeMethod(local_method); 4543 size_t j = 0; 4544 for (; j < actual_count; ++j) { 4545 mirror::ArtMethod* super_method = vtable->Get(j); 4546 super_mh.ChangeMethod(super_method); 4547 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4548 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4549 super_method->GetAccessFlags())) { 4550 if (super_method->IsFinal()) { 4551 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4552 PrettyMethod(local_method).c_str(), 4553 super_method->GetDeclaringClassDescriptor()); 4554 return false; 4555 } 4556 vtable->Set<false>(j, local_method); 4557 local_method->SetMethodIndex(j); 4558 break; 4559 } else { 4560 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4561 << " would have incorrectly overridden the package-private method in " 4562 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4563 } 4564 } 4565 } 4566 if (j == actual_count) { 4567 // Not overriding, append. 4568 vtable->Set<false>(actual_count, local_method); 4569 local_method->SetMethodIndex(actual_count); 4570 actual_count += 1; 4571 } 4572 } 4573 if (!IsUint(16, actual_count)) { 4574 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4575 return false; 4576 } 4577 // Shrink vtable if possible 4578 CHECK_LE(actual_count, max_count); 4579 if (actual_count < max_count) { 4580 vtable.Assign(vtable->CopyOf(self, actual_count)); 4581 if (UNLIKELY(vtable.Get() == NULL)) { 4582 CHECK(self->IsExceptionPending()); // OOME. 4583 return false; 4584 } 4585 } 4586 klass->SetVTable(vtable.Get()); 4587 } else { 4588 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4589 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4590 if (!IsUint(16, num_virtual_methods)) { 4591 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4592 return false; 4593 } 4594 StackHandleScope<1> hs(self); 4595 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4596 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4597 if (UNLIKELY(vtable.Get() == NULL)) { 4598 CHECK(self->IsExceptionPending()); // OOME. 4599 return false; 4600 } 4601 for (size_t i = 0; i < num_virtual_methods; ++i) { 4602 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4603 vtable->Set<false>(i, virtual_method); 4604 virtual_method->SetMethodIndex(i & 0xFFFF); 4605 } 4606 klass->SetVTable(vtable.Get()); 4607 } 4608 return true; 4609} 4610 4611bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 4612 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4613 Thread* const self = Thread::Current(); 4614 Runtime* const runtime = Runtime::Current(); 4615 // Set the imt table to be all conflicts by default. 4616 klass->SetImTable(runtime->GetDefaultImt()); 4617 size_t super_ifcount; 4618 if (klass->HasSuperClass()) { 4619 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4620 } else { 4621 super_ifcount = 0; 4622 } 4623 uint32_t num_interfaces = 4624 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4625 size_t ifcount = super_ifcount + num_interfaces; 4626 for (size_t i = 0; i < num_interfaces; i++) { 4627 mirror::Class* interface = 4628 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4629 interfaces->Get(i); 4630 ifcount += interface->GetIfTableCount(); 4631 } 4632 if (ifcount == 0) { 4633 // Class implements no interfaces. 4634 DCHECK_EQ(klass->GetIfTableCount(), 0); 4635 DCHECK(klass->GetIfTable() == NULL); 4636 return true; 4637 } 4638 if (ifcount == super_ifcount) { 4639 // Class implements same interfaces as parent, are any of these not marker interfaces? 4640 bool has_non_marker_interface = false; 4641 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4642 for (size_t i = 0; i < ifcount; ++i) { 4643 if (super_iftable->GetMethodArrayCount(i) > 0) { 4644 has_non_marker_interface = true; 4645 break; 4646 } 4647 } 4648 if (!has_non_marker_interface) { 4649 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4650 klass->SetIfTable(super_iftable); 4651 return true; 4652 } 4653 } 4654 StackHandleScope<4> hs(self); 4655 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4656 if (UNLIKELY(iftable.Get() == NULL)) { 4657 CHECK(self->IsExceptionPending()); // OOME. 4658 return false; 4659 } 4660 if (super_ifcount != 0) { 4661 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4662 for (size_t i = 0; i < super_ifcount; i++) { 4663 mirror::Class* super_interface = super_iftable->GetInterface(i); 4664 iftable->SetInterface(i, super_interface); 4665 } 4666 } 4667 // Flatten the interface inheritance hierarchy. 4668 size_t idx = super_ifcount; 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 DCHECK(interface != NULL); 4674 if (!interface->IsInterface()) { 4675 std::string temp; 4676 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4677 PrettyDescriptor(klass.Get()).c_str(), 4678 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4679 return false; 4680 } 4681 // Check if interface is already in iftable 4682 bool duplicate = false; 4683 for (size_t j = 0; j < idx; j++) { 4684 mirror::Class* existing_interface = iftable->GetInterface(j); 4685 if (existing_interface == interface) { 4686 duplicate = true; 4687 break; 4688 } 4689 } 4690 if (!duplicate) { 4691 // Add this non-duplicate interface. 4692 iftable->SetInterface(idx++, interface); 4693 // Add this interface's non-duplicate super-interfaces. 4694 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4695 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4696 bool super_duplicate = false; 4697 for (size_t k = 0; k < idx; k++) { 4698 mirror::Class* existing_interface = iftable->GetInterface(k); 4699 if (existing_interface == super_interface) { 4700 super_duplicate = true; 4701 break; 4702 } 4703 } 4704 if (!super_duplicate) { 4705 iftable->SetInterface(idx++, super_interface); 4706 } 4707 } 4708 } 4709 } 4710 // Shrink iftable in case duplicates were found 4711 if (idx < ifcount) { 4712 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4713 if (UNLIKELY(iftable.Get() == NULL)) { 4714 CHECK(self->IsExceptionPending()); // OOME. 4715 return false; 4716 } 4717 ifcount = idx; 4718 } else { 4719 CHECK_EQ(idx, ifcount); 4720 } 4721 klass->SetIfTable(iftable.Get()); 4722 4723 // If we're an interface, we don't need the vtable pointers, so we're done. 4724 if (klass->IsInterface()) { 4725 return true; 4726 } 4727 // Allocate imtable 4728 bool imtable_changed = false; 4729 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4730 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4731 if (UNLIKELY(imtable.Get() == NULL)) { 4732 CHECK(self->IsExceptionPending()); // OOME. 4733 return false; 4734 } 4735 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4736 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4737 std::vector<mirror::ArtMethod*> miranda_list; 4738 for (size_t i = 0; i < ifcount; ++i) { 4739 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4740 if (num_methods > 0) { 4741 StackHandleScope<2> hs(self); 4742 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4743 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4744 if (UNLIKELY(method_array.Get() == nullptr)) { 4745 CHECK(self->IsExceptionPending()); // OOME. 4746 return false; 4747 } 4748 iftable->SetMethodArray(i, method_array.Get()); 4749 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4750 hs.NewHandle(klass->GetVTableDuringLinking())); 4751 for (size_t j = 0; j < num_methods; ++j) { 4752 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 4753 interface_mh.ChangeMethod(interface_method); 4754 int32_t k; 4755 // For each method listed in the interface's method list, find the 4756 // matching method in our class's method list. We want to favor the 4757 // subclass over the superclass, which just requires walking 4758 // back from the end of the vtable. (This only matters if the 4759 // superclass defines a private method and this class redefines 4760 // it -- otherwise it would use the same vtable slot. In .dex files 4761 // those don't end up in the virtual method table, so it shouldn't 4762 // matter which direction we go. We walk it backward anyway.) 4763 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4764 mirror::ArtMethod* vtable_method = vtable->Get(k); 4765 vtable_mh.ChangeMethod(vtable_method); 4766 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4767 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 4768 ThrowIllegalAccessError( 4769 klass.Get(), 4770 "Method '%s' implementing interface method '%s' is not public", 4771 PrettyMethod(vtable_method).c_str(), 4772 PrettyMethod(interface_method).c_str()); 4773 return false; 4774 } 4775 method_array->Set<false>(j, vtable_method); 4776 // Place method in imt if entry is empty, place conflict otherwise. 4777 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4778 if (imtable->Get(imt_index) == NULL) { 4779 imtable->Set<false>(imt_index, vtable_method); 4780 imtable_changed = true; 4781 } else { 4782 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4783 } 4784 break; 4785 } 4786 } 4787 if (k < 0) { 4788 StackHandleScope<1> hs(self); 4789 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4790 for (mirror::ArtMethod* mir_method : miranda_list) { 4791 vtable_mh.ChangeMethod(mir_method); 4792 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4793 miranda_method.Assign(mir_method); 4794 break; 4795 } 4796 } 4797 if (miranda_method.Get() == NULL) { 4798 // Point the interface table at a phantom slot. 4799 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 4800 if (UNLIKELY(miranda_method.Get() == NULL)) { 4801 CHECK(self->IsExceptionPending()); // OOME. 4802 return false; 4803 } 4804 // TODO: If a methods move then the miranda_list may hold stale references. 4805 miranda_list.push_back(miranda_method.Get()); 4806 } 4807 method_array->Set<false>(j, miranda_method.Get()); 4808 } 4809 } 4810 } 4811 } 4812 if (imtable_changed) { 4813 // Fill in empty entries in interface method table with conflict. 4814 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4815 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4816 if (imtable->Get(i) == NULL) { 4817 imtable->Set<false>(i, imt_conflict_method); 4818 } 4819 } 4820 klass->SetImTable(imtable.Get()); 4821 } 4822 if (!miranda_list.empty()) { 4823 int old_method_count = klass->NumVirtualMethods(); 4824 int new_method_count = old_method_count + miranda_list.size(); 4825 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4826 if (old_method_count == 0) { 4827 virtuals = AllocArtMethodArray(self, new_method_count); 4828 } else { 4829 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4830 } 4831 if (UNLIKELY(virtuals == NULL)) { 4832 CHECK(self->IsExceptionPending()); // OOME. 4833 return false; 4834 } 4835 klass->SetVirtualMethods(virtuals); 4836 4837 StackHandleScope<1> hs(self); 4838 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4839 hs.NewHandle(klass->GetVTableDuringLinking())); 4840 CHECK(vtable.Get() != NULL); 4841 int old_vtable_count = vtable->GetLength(); 4842 int new_vtable_count = old_vtable_count + miranda_list.size(); 4843 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4844 if (UNLIKELY(vtable.Get() == NULL)) { 4845 CHECK(self->IsExceptionPending()); // OOME. 4846 return false; 4847 } 4848 for (size_t i = 0; i < miranda_list.size(); ++i) { 4849 mirror::ArtMethod* method = miranda_list[i]; 4850 // Leave the declaring class alone as type indices are relative to it 4851 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4852 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4853 klass->SetVirtualMethod(old_method_count + i, method); 4854 vtable->Set<false>(old_vtable_count + i, method); 4855 } 4856 // TODO: do not assign to the vtable field until it is fully constructed. 4857 klass->SetVTable(vtable.Get()); 4858 } 4859 4860 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4861 for (int i = 0; i < vtable->GetLength(); ++i) { 4862 CHECK(vtable->Get(i) != NULL); 4863 } 4864 4865// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4866 4867 return true; 4868} 4869 4870bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4871 CHECK(klass.Get() != NULL); 4872 return LinkFields(klass, false, nullptr); 4873} 4874 4875bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass, size_t* class_size) { 4876 CHECK(klass.Get() != NULL); 4877 return LinkFields(klass, true, class_size); 4878} 4879 4880struct LinkFieldsComparator { 4881 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4882 } 4883 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4884 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4885 NO_THREAD_SAFETY_ANALYSIS { 4886 // First come reference fields, then 64-bit, and finally 32-bit 4887 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4888 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4889 if (type1 != type2) { 4890 bool is_primitive1 = type1 != Primitive::kPrimNot; 4891 bool is_primitive2 = type2 != Primitive::kPrimNot; 4892 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4893 type1 == Primitive::kPrimDouble); 4894 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4895 type2 == Primitive::kPrimDouble); 4896 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4897 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4898 if (order1 != order2) { 4899 return order1 < order2; 4900 } 4901 } 4902 // same basic group? then sort by string. 4903 return strcmp(field1->GetName(), field2->GetName()) < 0; 4904 } 4905}; 4906 4907bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static, size_t* class_size) { 4908 size_t num_fields = 4909 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4910 4911 mirror::ObjectArray<mirror::ArtField>* fields = 4912 is_static ? klass->GetSFields() : klass->GetIFields(); 4913 4914 // Initialize field_offset 4915 MemberOffset field_offset(0); 4916 if (is_static) { 4917 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 4918 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4919 // Static fields come after the embedded tables. 4920 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 4921 0, 0, 0); 4922 } 4923 field_offset = MemberOffset(base); 4924 } else { 4925 mirror::Class* super_class = klass->GetSuperClass(); 4926 if (super_class != NULL) { 4927 CHECK(super_class->IsResolved()) 4928 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4929 field_offset = MemberOffset(super_class->GetObjectSize()); 4930 } 4931 } 4932 4933 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4934 4935 // we want a relatively stable order so that adding new fields 4936 // minimizes disruption of C++ version such as Class and Method. 4937 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4938 for (size_t i = 0; i < num_fields; i++) { 4939 mirror::ArtField* f = fields->Get(i); 4940 CHECK(f != NULL) << PrettyClass(klass.Get()); 4941 grouped_and_sorted_fields.push_back(f); 4942 } 4943 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4944 LinkFieldsComparator()); 4945 4946 // References should be at the front. 4947 size_t current_field = 0; 4948 size_t num_reference_fields = 0; 4949 for (; current_field < num_fields; current_field++) { 4950 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4951 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4952 bool isPrimitive = type != Primitive::kPrimNot; 4953 if (isPrimitive) { 4954 break; // past last reference, move on to the next phase 4955 } 4956 grouped_and_sorted_fields.pop_front(); 4957 num_reference_fields++; 4958 fields->Set<false>(current_field, field); 4959 field->SetOffset(field_offset); 4960 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4961 } 4962 4963 // Now we want to pack all of the double-wide fields together. If 4964 // we're not aligned, though, we want to shuffle one 32-bit field 4965 // into place. If we can't find one, we'll have to pad it. 4966 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4967 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4968 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4969 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4970 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4971 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4972 continue; 4973 } 4974 fields->Set<false>(current_field++, field); 4975 field->SetOffset(field_offset); 4976 // drop the consumed field 4977 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4978 break; 4979 } 4980 // whether we found a 32-bit field for padding or not, we advance 4981 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4982 } 4983 4984 // Alignment is good, shuffle any double-wide fields forward, and 4985 // finish assigning field offsets to all fields. 4986 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 4987 << PrettyClass(klass.Get()); 4988 while (!grouped_and_sorted_fields.empty()) { 4989 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4990 grouped_and_sorted_fields.pop_front(); 4991 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4992 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4993 fields->Set<false>(current_field, field); 4994 field->SetOffset(field_offset); 4995 field_offset = MemberOffset(field_offset.Uint32Value() + 4996 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4997 ? sizeof(uint64_t) 4998 : sizeof(uint32_t))); 4999 current_field++; 5000 } 5001 5002 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 5003 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 5004 // We know there are no non-reference fields in the Reference classes, and we know 5005 // that 'referent' is alphabetically last, so this is easy... 5006 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 5007 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 5008 --num_reference_fields; 5009 } 5010 5011 if (kIsDebugBuild) { 5012 // Make sure that all reference fields appear before 5013 // non-reference fields, and all double-wide fields are aligned. 5014 bool seen_non_ref = false; 5015 for (size_t i = 0; i < num_fields; i++) { 5016 mirror::ArtField* field = fields->Get(i); 5017 if (false) { // enable to debug field layout 5018 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 5019 << " class=" << PrettyClass(klass.Get()) 5020 << " field=" << PrettyField(field) 5021 << " offset=" 5022 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 5023 } 5024 Primitive::Type type = field->GetTypeAsPrimitiveType(); 5025 bool is_primitive = type != Primitive::kPrimNot; 5026 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 5027 strcmp("referent", field->GetName()) == 0) { 5028 is_primitive = true; // We lied above, so we have to expect a lie here. 5029 } 5030 if (is_primitive) { 5031 if (!seen_non_ref) { 5032 seen_non_ref = true; 5033 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 5034 } 5035 } else { 5036 DCHECK(!seen_non_ref) << PrettyField(field); 5037 } 5038 } 5039 if (!seen_non_ref) { 5040 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 5041 } 5042 } 5043 5044 size_t size = field_offset.Uint32Value(); 5045 // Update klass 5046 if (is_static) { 5047 klass->SetNumReferenceStaticFields(num_reference_fields); 5048 *class_size = size; 5049 } else { 5050 klass->SetNumReferenceInstanceFields(num_reference_fields); 5051 if (!klass->IsVariableSize()) { 5052 std::string temp; 5053 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 5054 size_t previous_size = klass->GetObjectSize(); 5055 if (previous_size != 0) { 5056 // Make sure that we didn't originally have an incorrect size. 5057 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 5058 } 5059 klass->SetObjectSize(size); 5060 } 5061 } 5062 return true; 5063} 5064 5065// Set the bitmap of reference offsets, refOffsets, from the ifields 5066// list. 5067void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 5068 uint32_t reference_offsets = 0; 5069 mirror::Class* super_class = klass->GetSuperClass(); 5070 if (super_class != NULL) { 5071 reference_offsets = super_class->GetReferenceInstanceOffsets(); 5072 // If our superclass overflowed, we don't stand a chance. 5073 if (reference_offsets == CLASS_WALK_SUPER) { 5074 klass->SetReferenceInstanceOffsets(reference_offsets); 5075 return; 5076 } 5077 } 5078 CreateReferenceOffsets(klass, false, reference_offsets); 5079} 5080 5081void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 5082 CreateReferenceOffsets(klass, true, 0); 5083} 5084 5085void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 5086 uint32_t reference_offsets) { 5087 size_t num_reference_fields = 5088 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 5089 : klass->NumReferenceInstanceFieldsDuringLinking(); 5090 mirror::ObjectArray<mirror::ArtField>* fields = 5091 is_static ? klass->GetSFields() : klass->GetIFields(); 5092 // All of the fields that contain object references are guaranteed 5093 // to be at the beginning of the fields list. 5094 for (size_t i = 0; i < num_reference_fields; ++i) { 5095 // Note that byte_offset is the offset from the beginning of 5096 // object, not the offset into instance data 5097 mirror::ArtField* field = fields->Get(i); 5098 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 5099 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 5100 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 5101 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 5102 CHECK_NE(new_bit, 0U); 5103 reference_offsets |= new_bit; 5104 } else { 5105 reference_offsets = CLASS_WALK_SUPER; 5106 break; 5107 } 5108 } 5109 // Update fields in klass 5110 if (is_static) { 5111 klass->SetReferenceStaticOffsets(reference_offsets); 5112 } else { 5113 klass->SetReferenceInstanceOffsets(reference_offsets); 5114 } 5115} 5116 5117mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 5118 Handle<mirror::DexCache> dex_cache) { 5119 DCHECK(dex_cache.Get() != nullptr); 5120 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 5121 if (resolved != NULL) { 5122 return resolved; 5123 } 5124 uint32_t utf16_length; 5125 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 5126 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 5127 dex_cache->SetResolvedString(string_idx, string); 5128 return string; 5129} 5130 5131mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5132 mirror::Class* referrer) { 5133 StackHandleScope<2> hs(Thread::Current()); 5134 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 5135 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 5136 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 5137} 5138 5139mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 5140 Handle<mirror::DexCache> dex_cache, 5141 Handle<mirror::ClassLoader> class_loader) { 5142 DCHECK(dex_cache.Get() != NULL); 5143 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 5144 if (resolved == NULL) { 5145 Thread* self = Thread::Current(); 5146 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 5147 resolved = FindClass(self, descriptor, class_loader); 5148 if (resolved != NULL) { 5149 // TODO: we used to throw here if resolved's class loader was not the 5150 // boot class loader. This was to permit different classes with the 5151 // same name to be loaded simultaneously by different loaders 5152 dex_cache->SetResolvedType(type_idx, resolved); 5153 } else { 5154 CHECK(self->IsExceptionPending()) 5155 << "Expected pending exception for failed resolution of: " << descriptor; 5156 // Convert a ClassNotFoundException to a NoClassDefFoundError. 5157 StackHandleScope<1> hs(self); 5158 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 5159 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 5160 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 5161 self->ClearException(); 5162 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 5163 self->GetException(NULL)->SetCause(cause.Get()); 5164 } 5165 } 5166 } 5167 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 5168 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 5169 return resolved; 5170} 5171 5172mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 5173 Handle<mirror::DexCache> dex_cache, 5174 Handle<mirror::ClassLoader> class_loader, 5175 Handle<mirror::ArtMethod> referrer, 5176 InvokeType type) { 5177 DCHECK(dex_cache.Get() != nullptr); 5178 // Check for hit in the dex cache. 5179 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 5180 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 5181 return resolved; 5182 } 5183 // Fail, get the declaring class. 5184 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5185 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 5186 if (klass == nullptr) { 5187 DCHECK(Thread::Current()->IsExceptionPending()); 5188 return nullptr; 5189 } 5190 // Scan using method_idx, this saves string compares but will only hit for matching dex 5191 // caches/files. 5192 switch (type) { 5193 case kDirect: // Fall-through. 5194 case kStatic: 5195 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5196 break; 5197 case kInterface: 5198 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5199 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5200 break; 5201 case kSuper: // Fall-through. 5202 case kVirtual: 5203 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5204 break; 5205 default: 5206 LOG(FATAL) << "Unreachable - invocation type: " << type; 5207 } 5208 if (resolved == nullptr) { 5209 // Search by name, which works across dex files. 5210 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5211 const Signature signature = dex_file.GetMethodSignature(method_id); 5212 switch (type) { 5213 case kDirect: // Fall-through. 5214 case kStatic: 5215 resolved = klass->FindDirectMethod(name, signature); 5216 break; 5217 case kInterface: 5218 resolved = klass->FindInterfaceMethod(name, signature); 5219 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5220 break; 5221 case kSuper: // Fall-through. 5222 case kVirtual: 5223 resolved = klass->FindVirtualMethod(name, signature); 5224 break; 5225 } 5226 } 5227 // If we found a method, check for incompatible class changes. 5228 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5229 // Be a good citizen and update the dex cache to speed subsequent calls. 5230 dex_cache->SetResolvedMethod(method_idx, resolved); 5231 return resolved; 5232 } else { 5233 // If we had a method, it's an incompatible-class-change error. 5234 if (resolved != nullptr) { 5235 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5236 } else { 5237 // We failed to find the method which means either an access error, an incompatible class 5238 // change, or no such method. First try to find the method among direct and virtual methods. 5239 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5240 const Signature signature = dex_file.GetMethodSignature(method_id); 5241 switch (type) { 5242 case kDirect: 5243 case kStatic: 5244 resolved = klass->FindVirtualMethod(name, signature); 5245 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5246 // have had a resolved method before, which triggers the "true" branch above. 5247 break; 5248 case kInterface: 5249 case kVirtual: 5250 case kSuper: 5251 resolved = klass->FindDirectMethod(name, signature); 5252 break; 5253 } 5254 5255 // If we found something, check that it can be accessed by the referrer. 5256 if (resolved != nullptr && referrer.Get() != nullptr) { 5257 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5258 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5259 if (!referring_class->CanAccess(methods_class)) { 5260 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5261 resolved, type); 5262 return nullptr; 5263 } else if (!referring_class->CanAccessMember(methods_class, 5264 resolved->GetAccessFlags())) { 5265 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5266 return nullptr; 5267 } 5268 } 5269 5270 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 5271 // methods and throw if we find the method there. If we find nothing, throw a 5272 // NoSuchMethodError. 5273 switch (type) { 5274 case kDirect: 5275 case kStatic: 5276 if (resolved != nullptr) { 5277 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5278 } else { 5279 resolved = klass->FindInterfaceMethod(name, signature); 5280 if (resolved != nullptr) { 5281 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5282 } else { 5283 ThrowNoSuchMethodError(type, klass, name, signature); 5284 } 5285 } 5286 break; 5287 case kInterface: 5288 if (resolved != nullptr) { 5289 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5290 } else { 5291 resolved = klass->FindVirtualMethod(name, signature); 5292 if (resolved != nullptr) { 5293 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5294 } else { 5295 ThrowNoSuchMethodError(type, klass, name, signature); 5296 } 5297 } 5298 break; 5299 case kSuper: 5300 if (resolved != nullptr) { 5301 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5302 } else { 5303 ThrowNoSuchMethodError(type, klass, name, signature); 5304 } 5305 break; 5306 case kVirtual: 5307 if (resolved != nullptr) { 5308 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5309 } else { 5310 resolved = klass->FindInterfaceMethod(name, signature); 5311 if (resolved != nullptr) { 5312 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5313 } else { 5314 ThrowNoSuchMethodError(type, klass, name, signature); 5315 } 5316 } 5317 break; 5318 } 5319 } 5320 DCHECK(Thread::Current()->IsExceptionPending()); 5321 return nullptr; 5322 } 5323} 5324 5325mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5326 Handle<mirror::DexCache> dex_cache, 5327 Handle<mirror::ClassLoader> class_loader, 5328 bool is_static) { 5329 DCHECK(dex_cache.Get() != nullptr); 5330 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5331 if (resolved != nullptr) { 5332 return resolved; 5333 } 5334 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5335 Thread* const self = Thread::Current(); 5336 StackHandleScope<1> hs(self); 5337 Handle<mirror::Class> klass( 5338 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5339 if (klass.Get() == nullptr) { 5340 DCHECK(Thread::Current()->IsExceptionPending()); 5341 return nullptr; 5342 } 5343 5344 if (is_static) { 5345 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5346 } else { 5347 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5348 } 5349 5350 if (resolved == nullptr) { 5351 const char* name = dex_file.GetFieldName(field_id); 5352 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5353 if (is_static) { 5354 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5355 } else { 5356 resolved = klass->FindInstanceField(name, type); 5357 } 5358 if (resolved == nullptr) { 5359 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5360 return NULL; 5361 } 5362 } 5363 dex_cache->SetResolvedField(field_idx, resolved); 5364 return resolved; 5365} 5366 5367mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5368 uint32_t field_idx, 5369 Handle<mirror::DexCache> dex_cache, 5370 Handle<mirror::ClassLoader> class_loader) { 5371 DCHECK(dex_cache.Get() != nullptr); 5372 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5373 if (resolved != nullptr) { 5374 return resolved; 5375 } 5376 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5377 Thread* self = Thread::Current(); 5378 StackHandleScope<1> hs(self); 5379 Handle<mirror::Class> klass( 5380 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5381 if (klass.Get() == NULL) { 5382 DCHECK(Thread::Current()->IsExceptionPending()); 5383 return NULL; 5384 } 5385 5386 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5387 StringPiece type(dex_file.StringDataByIdx( 5388 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5389 resolved = mirror::Class::FindField(self, klass, name, type); 5390 if (resolved != NULL) { 5391 dex_cache->SetResolvedField(field_idx, resolved); 5392 } else { 5393 ThrowNoSuchFieldError("", klass.Get(), type, name); 5394 } 5395 return resolved; 5396} 5397 5398const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5399 uint32_t* length) { 5400 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5401 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5402 const DexFile& dex_file = *dex_cache->GetDexFile(); 5403 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5404 return dex_file.GetMethodShorty(method_id, length); 5405} 5406 5407void ClassLinker::DumpAllClasses(int flags) { 5408 if (dex_cache_image_class_lookup_required_) { 5409 MoveImageClassesToClassTable(); 5410 } 5411 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5412 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5413 std::vector<mirror::Class*> all_classes; 5414 { 5415 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5416 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5417 mirror::Class* klass = it.second.Read(); 5418 all_classes.push_back(klass); 5419 } 5420 } 5421 5422 for (size_t i = 0; i < all_classes.size(); ++i) { 5423 all_classes[i]->DumpClass(std::cerr, flags); 5424 } 5425} 5426 5427void ClassLinker::DumpForSigQuit(std::ostream& os) { 5428 if (dex_cache_image_class_lookup_required_) { 5429 MoveImageClassesToClassTable(); 5430 } 5431 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5432 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5433} 5434 5435size_t ClassLinker::NumLoadedClasses() { 5436 if (dex_cache_image_class_lookup_required_) { 5437 MoveImageClassesToClassTable(); 5438 } 5439 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5440 return class_table_.size(); 5441} 5442 5443pid_t ClassLinker::GetClassesLockOwner() { 5444 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5445} 5446 5447pid_t ClassLinker::GetDexLockOwner() { 5448 return dex_lock_.GetExclusiveOwnerTid(); 5449} 5450 5451void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5452 DCHECK(!init_done_); 5453 5454 DCHECK(klass != NULL); 5455 DCHECK(klass->GetClassLoader() == NULL); 5456 5457 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5458 DCHECK(class_roots != NULL); 5459 DCHECK(class_roots->Get(class_root) == NULL); 5460 class_roots->Set<false>(class_root, klass); 5461} 5462 5463} // namespace art 5464