class_linker.cc revision 6b28a456b075fe53dfb7e924a44dbf35d0d41eb3
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <fcntl.h> 20#include <sys/file.h> 21#include <sys/stat.h> 22#include <deque> 23#include <memory> 24#include <string> 25#include <utility> 26#include <vector> 27 28#include "base/casts.h" 29#include "base/logging.h" 30#include "base/scoped_flock.h" 31#include "base/stl_util.h" 32#include "base/unix_file/fd_file.h" 33#include "class_linker-inl.h" 34#include "compiler_callbacks.h" 35#include "debugger.h" 36#include "dex_file-inl.h" 37#include "gc_root-inl.h" 38#include "gc/accounting/card_table-inl.h" 39#include "gc/accounting/heap_bitmap.h" 40#include "gc/heap.h" 41#include "gc/space/image_space.h" 42#include "handle_scope.h" 43#include "intern_table.h" 44#include "interpreter/interpreter.h" 45#include "leb128.h" 46#include "method_helper-inl.h" 47#include "oat.h" 48#include "oat_file.h" 49#include "object_lock.h" 50#include "mirror/art_field-inl.h" 51#include "mirror/art_method-inl.h" 52#include "mirror/class.h" 53#include "mirror/class-inl.h" 54#include "mirror/class_loader.h" 55#include "mirror/dex_cache-inl.h" 56#include "mirror/iftable-inl.h" 57#include "mirror/object-inl.h" 58#include "mirror/object_array-inl.h" 59#include "mirror/proxy.h" 60#include "mirror/reference-inl.h" 61#include "mirror/stack_trace_element.h" 62#include "mirror/string-inl.h" 63#include "os.h" 64#include "runtime.h" 65#include "entrypoints/entrypoint_utils.h" 66#include "ScopedLocalRef.h" 67#include "scoped_thread_state_change.h" 68#include "handle_scope-inl.h" 69#include "thread.h" 70#include "utils.h" 71#include "verifier/method_verifier.h" 72#include "well_known_classes.h" 73 74namespace art { 75 76static void ThrowNoClassDefFoundError(const char* fmt, ...) 77 __attribute__((__format__(__printf__, 1, 2))) 78 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 79static void ThrowNoClassDefFoundError(const char* fmt, ...) { 80 va_list args; 81 va_start(args, fmt); 82 Thread* self = Thread::Current(); 83 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 84 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 85 va_end(args); 86} 87 88static void ThrowEarlierClassFailure(mirror::Class* c) 89 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 90 // The class failed to initialize on a previous attempt, so we want to throw 91 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 92 // failed in verification, in which case v2 5.4.1 says we need to re-throw 93 // the previous error. 94 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 95 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 96 } 97 98 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 99 Thread* self = Thread::Current(); 100 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 101 if (c->GetVerifyErrorClass() != NULL) { 102 // TODO: change the verifier to store an _instance_, with a useful detail message? 103 std::string temp; 104 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 105 PrettyDescriptor(c).c_str()); 106 } else { 107 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 108 PrettyDescriptor(c).c_str()); 109 } 110} 111 112static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 113 Thread* self = Thread::Current(); 114 JNIEnv* env = self->GetJniEnv(); 115 116 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 117 CHECK(cause.get() != NULL); 118 119 env->ExceptionClear(); 120 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 121 env->Throw(cause.get()); 122 123 // We only wrap non-Error exceptions; an Error can just be used as-is. 124 if (!is_error) { 125 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 126 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 127 } 128} 129 130static size_t Hash(const char* s) { 131 // This is the java.lang.String hashcode for convenience, not interoperability. 132 size_t hash = 0; 133 for (; *s != '\0'; ++s) { 134 hash = hash * 31 + *s; 135 } 136 return hash; 137} 138 139const char* ClassLinker::class_roots_descriptors_[] = { 140 "Ljava/lang/Class;", 141 "Ljava/lang/Object;", 142 "[Ljava/lang/Class;", 143 "[Ljava/lang/Object;", 144 "Ljava/lang/String;", 145 "Ljava/lang/DexCache;", 146 "Ljava/lang/ref/Reference;", 147 "Ljava/lang/reflect/ArtField;", 148 "Ljava/lang/reflect/ArtMethod;", 149 "Ljava/lang/reflect/Proxy;", 150 "[Ljava/lang/String;", 151 "[Ljava/lang/reflect/ArtField;", 152 "[Ljava/lang/reflect/ArtMethod;", 153 "Ljava/lang/ClassLoader;", 154 "Ljava/lang/Throwable;", 155 "Ljava/lang/ClassNotFoundException;", 156 "Ljava/lang/StackTraceElement;", 157 "Z", 158 "B", 159 "C", 160 "D", 161 "F", 162 "I", 163 "J", 164 "S", 165 "V", 166 "[Z", 167 "[B", 168 "[C", 169 "[D", 170 "[F", 171 "[I", 172 "[J", 173 "[S", 174 "[Ljava/lang/StackTraceElement;", 175}; 176 177ClassLinker::ClassLinker(InternTable* intern_table) 178 // dex_lock_ is recursive as it may be used in stack dumping. 179 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 180 dex_cache_image_class_lookup_required_(false), 181 failed_dex_cache_class_lookups_(0), 182 class_roots_(nullptr), 183 array_iftable_(nullptr), 184 find_array_class_cache_next_victim_(0), 185 init_done_(false), 186 log_new_dex_caches_roots_(false), 187 log_new_class_table_roots_(false), 188 intern_table_(intern_table), 189 portable_resolution_trampoline_(nullptr), 190 quick_resolution_trampoline_(nullptr), 191 portable_imt_conflict_trampoline_(nullptr), 192 quick_imt_conflict_trampoline_(nullptr), 193 quick_generic_jni_trampoline_(nullptr), 194 quick_to_interpreter_bridge_trampoline_(nullptr) { 195 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 196 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 197} 198 199// To set a value for generic JNI. May be necessary in compiler tests. 200extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 201extern "C" void art_quick_resolution_trampoline(mirror::ArtMethod*); 202extern "C" void art_quick_imt_conflict_trampoline(mirror::ArtMethod*); 203extern "C" void art_quick_to_interpreter_bridge(mirror::ArtMethod*); 204 205void ClassLinker::InitWithoutImage(const std::vector<const DexFile*>& boot_class_path) { 206 VLOG(startup) << "ClassLinker::Init"; 207 CHECK(!Runtime::Current()->GetHeap()->HasImageSpace()) << "Runtime has image. We should use it."; 208 209 CHECK(!init_done_); 210 211 // java_lang_Class comes first, it's needed for AllocClass 212 Thread* self = Thread::Current(); 213 gc::Heap* heap = Runtime::Current()->GetHeap(); 214 // The GC can't handle an object with a null class since we can't get the size of this object. 215 heap->IncrementDisableMovingGC(self); 216 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 217 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 218 heap->AllocNonMovableObject<true>(self, nullptr, 219 mirror::Class::ClassClassSize(), 220 VoidFunctor())))); 221 CHECK(java_lang_Class.Get() != NULL); 222 mirror::Class::SetClassClass(java_lang_Class.Get()); 223 java_lang_Class->SetClass(java_lang_Class.Get()); 224 if (kUseBakerOrBrooksReadBarrier) { 225 java_lang_Class->AssertReadBarrierPointer(); 226 } 227 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 228 heap->DecrementDisableMovingGC(self); 229 // AllocClass(mirror::Class*) can now be used 230 231 // Class[] is used for reflection support. 232 Handle<mirror::Class> class_array_class(hs.NewHandle( 233 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 234 class_array_class->SetComponentType(java_lang_Class.Get()); 235 236 // java_lang_Object comes next so that object_array_class can be created. 237 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 238 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 239 CHECK(java_lang_Object.Get() != NULL); 240 // backfill Object as the super class of Class. 241 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 242 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 243 244 // Object[] next to hold class roots. 245 Handle<mirror::Class> object_array_class(hs.NewHandle( 246 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 247 object_array_class->SetComponentType(java_lang_Object.Get()); 248 249 // Setup the char (primitive) class to be used for char[]. 250 Handle<mirror::Class> char_class(hs.NewHandle( 251 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 252 253 // Setup the char[] class to be used for String. 254 Handle<mirror::Class> char_array_class(hs.NewHandle( 255 AllocClass(self, java_lang_Class.Get(), 256 mirror::Array::ClassSize()))); 257 char_array_class->SetComponentType(char_class.Get()); 258 mirror::CharArray::SetArrayClass(char_array_class.Get()); 259 260 // Setup String. 261 Handle<mirror::Class> java_lang_String(hs.NewHandle( 262 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 263 mirror::String::SetClass(java_lang_String.Get()); 264 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 265 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 266 267 // Setup Reference. 268 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 269 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 270 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 271 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 272 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 273 274 // Create storage for root classes, save away our work so far (requires descriptors). 275 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 276 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 277 kClassRootsMax)); 278 CHECK(!class_roots_.IsNull()); 279 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 280 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 281 SetClassRoot(kClassArrayClass, class_array_class.Get()); 282 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 283 SetClassRoot(kCharArrayClass, char_array_class.Get()); 284 SetClassRoot(kJavaLangString, java_lang_String.Get()); 285 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 286 287 // Setup the primitive type classes. 288 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 289 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 290 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 291 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 292 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 293 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 294 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 295 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 296 297 // Create array interface entries to populate once we can load system classes. 298 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 299 300 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 301 Handle<mirror::Class> int_array_class(hs.NewHandle( 302 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 303 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 304 mirror::IntArray::SetArrayClass(int_array_class.Get()); 305 SetClassRoot(kIntArrayClass, int_array_class.Get()); 306 307 // now that these are registered, we can use AllocClass() and AllocObjectArray 308 309 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 310 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 311 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 312 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 313 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 314 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 315 316 // Constructor, Field, Method, and AbstractMethod are necessary so 317 // that FindClass can link members. 318 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 319 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 320 CHECK(java_lang_reflect_ArtField.Get() != NULL); 321 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 322 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 323 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 324 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 325 326 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 327 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 328 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 329 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 330 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 331 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 332 333 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 334 335 // Set up array classes for string, field, method 336 Handle<mirror::Class> object_array_string(hs.NewHandle( 337 AllocClass(self, java_lang_Class.Get(), 338 mirror::ObjectArray<mirror::String>::ClassSize()))); 339 object_array_string->SetComponentType(java_lang_String.Get()); 340 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 341 342 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 343 AllocClass(self, java_lang_Class.Get(), 344 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 345 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 346 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 347 348 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 349 AllocClass(self, java_lang_Class.Get(), 350 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 351 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 352 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 353 354 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 355 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 356 // these roots. 357 CHECK_NE(0U, boot_class_path.size()); 358 for (size_t i = 0; i != boot_class_path.size(); ++i) { 359 const DexFile* dex_file = boot_class_path[i]; 360 CHECK(dex_file != NULL); 361 AppendToBootClassPath(*dex_file); 362 } 363 364 // now we can use FindSystemClass 365 366 // run char class through InitializePrimitiveClass to finish init 367 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 368 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 369 370 // Create runtime resolution and imt conflict methods. Also setup the default imt. 371 Runtime* runtime = Runtime::Current(); 372 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 373 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 374 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 375 376 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 377 // we do not need friend classes or a publicly exposed setter. 378 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 379 if (!runtime->IsCompiler()) { 380 // We need to set up the generic trampolines since we don't have an image. 381 quick_resolution_trampoline_ = reinterpret_cast<void*>(art_quick_resolution_trampoline); 382 quick_imt_conflict_trampoline_ = reinterpret_cast<void*>(art_quick_imt_conflict_trampoline); 383 quick_to_interpreter_bridge_trampoline_ = reinterpret_cast<void*>(art_quick_to_interpreter_bridge); 384 } 385 386 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 387 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 388 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 389 CHECK_EQ(java_lang_Object.Get(), Object_class); 390 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 391 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 392 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 393 std::ostringstream os1, os2; 394 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 395 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 396 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 397 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 398 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 399 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 400 CHECK_EQ(java_lang_String.Get(), String_class); 401 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 402 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 403 404 // Setup the primitive array type classes - can't be done until Object has a vtable. 405 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 406 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 407 408 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 409 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 410 411 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 412 CHECK_EQ(char_array_class.Get(), found_char_array_class); 413 414 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 415 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 416 417 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 418 CHECK_EQ(int_array_class.Get(), found_int_array_class); 419 420 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 421 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 422 423 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 424 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 425 426 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 427 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 428 429 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 430 CHECK_EQ(class_array_class.Get(), found_class_array_class); 431 432 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 433 CHECK_EQ(object_array_class.Get(), found_object_array_class); 434 435 // Setup the single, global copy of "iftable". 436 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 437 CHECK(java_lang_Cloneable != NULL); 438 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 439 CHECK(java_io_Serializable != NULL); 440 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 441 // crawl up and explicitly list all of the supers as well. 442 { 443 mirror::IfTable* array_iftable = array_iftable_.Read(); 444 array_iftable->SetInterface(0, java_lang_Cloneable); 445 array_iftable->SetInterface(1, java_io_Serializable); 446 } 447 448 // Sanity check Class[] and Object[]'s interfaces. 449 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 450 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 451 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 452 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 453 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 454 // dex_cache_ fields and register them in class_table_. 455 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 456 CHECK_EQ(java_lang_Class.Get(), Class_class); 457 458 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 459 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 460 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 461 462 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 463 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 464 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 465 466 mirror::Class* String_array_class = 467 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 468 CHECK_EQ(object_array_string.Get(), String_array_class); 469 470 mirror::Class* Art_method_array_class = 471 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 472 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 473 474 mirror::Class* Art_field_array_class = 475 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 476 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 477 478 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 479 480 // Create java.lang.reflect.Proxy root. 481 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 482 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 483 484 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 485 // finish initializing Reference class 486 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 487 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 488 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 489 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 490 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 491 mirror::Class* java_lang_ref_FinalizerReference = 492 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 493 java_lang_ref_FinalizerReference->SetAccessFlags( 494 java_lang_ref_FinalizerReference->GetAccessFlags() | 495 kAccClassIsReference | kAccClassIsFinalizerReference); 496 mirror::Class* java_lang_ref_PhantomReference = 497 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 498 java_lang_ref_PhantomReference->SetAccessFlags( 499 java_lang_ref_PhantomReference->GetAccessFlags() | 500 kAccClassIsReference | kAccClassIsPhantomReference); 501 mirror::Class* java_lang_ref_SoftReference = 502 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 503 java_lang_ref_SoftReference->SetAccessFlags( 504 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 505 mirror::Class* java_lang_ref_WeakReference = 506 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 507 java_lang_ref_WeakReference->SetAccessFlags( 508 java_lang_ref_WeakReference->GetAccessFlags() | 509 kAccClassIsReference | kAccClassIsWeakReference); 510 511 // Setup the ClassLoader, verifying the object_size_. 512 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 513 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 514 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 515 516 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 517 // java.lang.StackTraceElement as a convenience. 518 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 519 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 520 SetClassRoot(kJavaLangClassNotFoundException, 521 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 522 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 523 SetClassRoot(kJavaLangStackTraceElementArrayClass, 524 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 525 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 526 527 FinishInit(self); 528 529 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 530} 531 532void ClassLinker::FinishInit(Thread* self) { 533 VLOG(startup) << "ClassLinker::FinishInit entering"; 534 535 // Let the heap know some key offsets into java.lang.ref instances 536 // Note: we hard code the field indexes here rather than using FindInstanceField 537 // as the types of the field can't be resolved prior to the runtime being 538 // fully initialized 539 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 540 mirror::Class* java_lang_ref_FinalizerReference = 541 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 542 543 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 544 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 545 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 546 547 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 548 CHECK_STREQ(queue->GetName(), "queue"); 549 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 550 551 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 552 CHECK_STREQ(queueNext->GetName(), "queueNext"); 553 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 554 555 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 556 CHECK_STREQ(referent->GetName(), "referent"); 557 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 558 559 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 560 CHECK_STREQ(zombie->GetName(), "zombie"); 561 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 562 563 // ensure all class_roots_ are initialized 564 for (size_t i = 0; i < kClassRootsMax; i++) { 565 ClassRoot class_root = static_cast<ClassRoot>(i); 566 mirror::Class* klass = GetClassRoot(class_root); 567 CHECK(klass != NULL); 568 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 569 // note SetClassRoot does additional validation. 570 // if possible add new checks there to catch errors early 571 } 572 573 CHECK(!array_iftable_.IsNull()); 574 575 // disable the slow paths in FindClass and CreatePrimitiveClass now 576 // that Object, Class, and Object[] are setup 577 init_done_ = true; 578 579 VLOG(startup) << "ClassLinker::FinishInit exiting"; 580} 581 582void ClassLinker::RunRootClinits() { 583 Thread* self = Thread::Current(); 584 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 585 mirror::Class* c = GetClassRoot(ClassRoot(i)); 586 if (!c->IsArrayClass() && !c->IsPrimitive()) { 587 StackHandleScope<1> hs(self); 588 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 589 EnsureInitialized(h_class, true, true); 590 self->AssertNoPendingException(); 591 } 592 } 593} 594 595bool ClassLinker::GenerateOatFile(const char* dex_filename, 596 int oat_fd, 597 const char* oat_cache_filename, 598 std::string* error_msg) { 599 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 600 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 601 602 gc::Heap* heap = Runtime::Current()->GetHeap(); 603 std::string boot_image_option("--boot-image="); 604 if (heap->GetImageSpace() == nullptr) { 605 // TODO If we get a dex2dex compiler working we could maybe use that, OTOH since we are likely 606 // out of space anyway it might not matter. 607 *error_msg = StringPrintf("Cannot create oat file for '%s' because we are running " 608 "without an image.", dex_filename); 609 return false; 610 } 611 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 612 613 std::string dex_file_option("--dex-file="); 614 dex_file_option += dex_filename; 615 616 std::string oat_fd_option("--oat-fd="); 617 StringAppendF(&oat_fd_option, "%d", oat_fd); 618 619 std::string oat_location_option("--oat-location="); 620 oat_location_option += oat_cache_filename; 621 622 std::vector<std::string> argv; 623 argv.push_back(dex2oat); 624 argv.push_back("--runtime-arg"); 625 argv.push_back("-classpath"); 626 argv.push_back("--runtime-arg"); 627 argv.push_back(Runtime::Current()->GetClassPathString()); 628 629 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 630 631 if (!Runtime::Current()->IsVerificationEnabled()) { 632 argv.push_back("--compiler-filter=verify-none"); 633 } 634 635 if (Runtime::Current()->MustRelocateIfPossible()) { 636 argv.push_back("--runtime-arg"); 637 argv.push_back("-Xrelocate"); 638 } else { 639 argv.push_back("--runtime-arg"); 640 argv.push_back("-Xnorelocate"); 641 } 642 643 if (!kIsTargetBuild) { 644 argv.push_back("--host"); 645 } 646 647 argv.push_back(boot_image_option); 648 argv.push_back(dex_file_option); 649 argv.push_back(oat_fd_option); 650 argv.push_back(oat_location_option); 651 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 652 for (size_t i = 0; i < compiler_options.size(); ++i) { 653 argv.push_back(compiler_options[i].c_str()); 654 } 655 656 return Exec(argv, error_msg); 657} 658 659const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 660 WriterMutexLock mu(Thread::Current(), dex_lock_); 661 if (kIsDebugBuild) { 662 for (size_t i = 0; i < oat_files_.size(); ++i) { 663 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 664 } 665 } 666 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 667 oat_files_.push_back(oat_file); 668 return oat_file; 669} 670 671OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 672 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 673 OatFile* oat_file = space->ReleaseOatFile(); 674 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 675 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 676 return *oat_file; 677} 678 679const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 680 const char* dex_location = dex_file.GetLocation().c_str(); 681 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 682 return FindOpenedOatFile(nullptr, dex_location, &dex_location_checksum); 683} 684 685const OatFile* ClassLinker::FindOpenedOatFile(const char* oat_location, const char* dex_location, 686 const uint32_t* const dex_location_checksum) { 687 ReaderMutexLock mu(Thread::Current(), dex_lock_); 688 for (size_t i = 0; i < oat_files_.size(); i++) { 689 const OatFile* oat_file = oat_files_[i]; 690 DCHECK(oat_file != NULL); 691 692 if (oat_location != nullptr) { 693 if (oat_file->GetLocation() != oat_location) { 694 continue; 695 } 696 } 697 698 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 699 dex_location_checksum, 700 false); 701 if (oat_dex_file != NULL) { 702 return oat_file; 703 } 704 } 705 return NULL; 706} 707 708static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, const char* dex_location, 709 bool generated, 710 std::vector<std::string>* error_msgs, 711 std::vector<const DexFile*>* dex_files) { 712 if (oat_file == nullptr) { 713 return false; 714 } 715 716 size_t old_size = dex_files->size(); // To rollback on error. 717 718 bool success = true; 719 for (size_t i = 0; success; ++i) { 720 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 721 const char* next_name = next_name_str.c_str(); 722 723 uint32_t dex_location_checksum; 724 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 725 std::string error_msg; 726 if (!DexFile::GetChecksum(next_name, dex_location_checksum_pointer, &error_msg)) { 727 DCHECK_EQ(false, i == 0 && generated); 728 dex_location_checksum_pointer = nullptr; 729 } 730 731 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 732 733 if (oat_dex_file == nullptr) { 734 if (i == 0 && generated) { 735 std::string error_msg; 736 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 737 " file'%s'", dex_location, dex_location_checksum, 738 oat_file->GetLocation().c_str()); 739 error_msgs->push_back(error_msg); 740 } 741 break; // Not found, done. 742 } 743 744 // Checksum test. Test must succeed when generated. 745 success = !generated; 746 if (dex_location_checksum_pointer != nullptr) { 747 success = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 748 } 749 750 if (success) { 751 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 752 if (dex_file == nullptr) { 753 success = false; 754 error_msgs->push_back(error_msg); 755 } else { 756 dex_files->push_back(dex_file); 757 } 758 } 759 760 // When we generated the file, we expect success, or something is terribly wrong. 761 CHECK_EQ(false, generated && !success) 762 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 763 << std::hex << " dex_location_checksum=" << dex_location_checksum 764 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 765 } 766 767 if (dex_files->size() == old_size) { 768 success = false; // We did not even find classes.dex 769 } 770 771 if (success) { 772 return true; 773 } else { 774 // Free all the dex files we have loaded. 775 auto it = dex_files->begin() + old_size; 776 auto it_end = dex_files->end(); 777 for (; it != it_end; it++) { 778 delete *it; 779 } 780 dex_files->erase(dex_files->begin() + old_size, it_end); 781 782 return false; 783 } 784} 785 786// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 787// complicates the loading process, as we should not use an iterative loading process, because that 788// would register the oat file and dex files that come before the broken one. Instead, check all 789// multidex ahead of time. 790bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 791 std::vector<std::string>* error_msgs, 792 std::vector<const DexFile*>* dex_files) { 793 // 1) Check whether we have an open oat file. 794 // This requires a dex checksum, use the "primary" one. 795 uint32_t dex_location_checksum; 796 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 797 bool have_checksum = true; 798 std::string checksum_error_msg; 799 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 800 dex_location_checksum_pointer = nullptr; 801 have_checksum = false; 802 } 803 804 bool needs_registering = false; 805 806 std::unique_ptr<const OatFile> open_oat_file(FindOpenedOatFile(oat_location, dex_location, 807 dex_location_checksum_pointer)); 808 809 // 2) If we do not have an open one, maybe there's one on disk already. 810 811 // In case the oat file is not open, we play a locking game here so 812 // that if two different processes race to load and register or generate 813 // (or worse, one tries to open a partial generated file) we will be okay. 814 // This is actually common with apps that use DexClassLoader to work 815 // around the dex method reference limit and that have a background 816 // service running in a separate process. 817 ScopedFlock scoped_flock; 818 819 if (open_oat_file.get() == nullptr) { 820 if (oat_location != nullptr) { 821 // Can only do this if we have a checksum, else error. 822 if (!have_checksum) { 823 error_msgs->push_back(checksum_error_msg); 824 return false; 825 } 826 827 std::string error_msg; 828 829 // We are loading or creating one in the future. Time to set up the file lock. 830 if (!scoped_flock.Init(oat_location, &error_msg)) { 831 error_msgs->push_back(error_msg); 832 return false; 833 } 834 835 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 836 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 837 oat_location, &error_msg)); 838 839 if (open_oat_file.get() == nullptr) { 840 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 841 dex_location, oat_location, error_msg.c_str()); 842 VLOG(class_linker) << compound_msg; 843 error_msgs->push_back(compound_msg); 844 } 845 } else { 846 // TODO: What to lock here? 847 bool obsolete_file_cleanup_failed; 848 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 849 dex_location_checksum_pointer, 850 kRuntimeISA, error_msgs, 851 &obsolete_file_cleanup_failed)); 852 // There's no point in going forward and eventually try to regenerate the 853 // file if we couldn't remove the obsolete one. Mostly likely we will fail 854 // with the same error when trying to write the new file. 855 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 856 if (obsolete_file_cleanup_failed) { 857 return false; 858 } 859 } 860 needs_registering = true; 861 } 862 863 // 3) If we have an oat file, check all contained multidex files for our dex_location. 864 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 865 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, false, error_msgs, 866 dex_files); 867 if (success) { 868 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 869 if (needs_registering) { 870 // We opened the oat file, so we must register it. 871 RegisterOatFile(oat_file); 872 } 873 // If the file isn't executable we failed patchoat but did manage to get the dex files. 874 return oat_file->IsExecutable(); 875 } else { 876 if (needs_registering) { 877 // We opened it, delete it. 878 open_oat_file.reset(); 879 } else { 880 open_oat_file.release(); // Do not delete open oat files. 881 } 882 } 883 884 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 885 886 // Need a checksum, fail else. 887 if (!have_checksum) { 888 error_msgs->push_back(checksum_error_msg); 889 return false; 890 } 891 892 // Look in cache location if no oat_location is given. 893 std::string cache_location; 894 if (oat_location == nullptr) { 895 // Use the dalvik cache. 896 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 897 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 898 oat_location = cache_location.c_str(); 899 } 900 901 bool has_flock = true; 902 // Definitely need to lock now. 903 if (!scoped_flock.HasFile()) { 904 std::string error_msg; 905 if (!scoped_flock.Init(oat_location, &error_msg)) { 906 error_msgs->push_back(error_msg); 907 has_flock = false; 908 } 909 } 910 911 if (Runtime::Current()->IsDex2OatEnabled() && has_flock && scoped_flock.HasFile()) { 912 // Create the oat file. 913 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 914 oat_location, error_msgs)); 915 } 916 917 // Failed, bail. 918 if (open_oat_file.get() == nullptr) { 919 std::string error_msg; 920 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 921 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 922 error_msgs->push_back(error_msg); 923 return false; 924 } 925 926 // Try to load again, but stronger checks. 927 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, true, error_msgs, 928 dex_files); 929 if (success) { 930 RegisterOatFile(open_oat_file.release()); 931 return true; 932 } else { 933 return false; 934 } 935} 936 937const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 938 uint32_t dex_location_checksum, 939 const char* oat_location, 940 std::string* error_msg) { 941 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 942 !Runtime::Current()->IsCompiler(), 943 error_msg)); 944 if (oat_file.get() == nullptr) { 945 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 946 error_msg->c_str()); 947 return nullptr; 948 } 949 Runtime* runtime = Runtime::Current(); 950 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 951 if (image_space != nullptr) { 952 const ImageHeader& image_header = image_space->GetImageHeader(); 953 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 954 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 955 if (expected_image_oat_checksum != actual_image_oat_checksum) { 956 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 957 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 958 actual_image_oat_checksum); 959 return nullptr; 960 } 961 962 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 963 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 964 if (expected_image_oat_offset != actual_image_oat_offset) { 965 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 966 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 967 actual_image_oat_offset); 968 return nullptr; 969 } 970 int32_t expected_patch_delta = image_header.GetPatchDelta(); 971 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 972 if (expected_patch_delta != actual_patch_delta) { 973 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 974 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 975 return nullptr; 976 } 977 } 978 979 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 980 &dex_location_checksum); 981 if (oat_dex_file == nullptr) { 982 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 983 dex_location); 984 return nullptr; 985 } 986 uint32_t expected_dex_checksum = dex_location_checksum; 987 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 988 if (expected_dex_checksum != actual_dex_checksum) { 989 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 990 "found 0x%x", oat_location, expected_dex_checksum, 991 actual_dex_checksum); 992 return nullptr; 993 } 994 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 995 if (dex_file.get() != nullptr) { 996 return oat_file.release(); 997 } else { 998 return nullptr; 999 } 1000} 1001 1002const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 1003 int fd, const char* oat_location, 1004 std::vector<std::string>* error_msgs) { 1005 // Generate the output oat file for the dex file 1006 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 1007 std::string error_msg; 1008 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 1009 CHECK(!error_msg.empty()); 1010 error_msgs->push_back(error_msg); 1011 return nullptr; 1012 } 1013 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 1014 !Runtime::Current()->IsCompiler(), 1015 &error_msg)); 1016 if (oat_file.get() == nullptr) { 1017 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 1018 oat_location, error_msg.c_str()); 1019 error_msgs->push_back(compound_msg); 1020 return nullptr; 1021 } 1022 1023 return oat_file.release(); 1024} 1025 1026bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1027 const InstructionSet instruction_set) { 1028 Runtime* runtime = Runtime::Current(); 1029 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1030 if (image_space == nullptr) { 1031 return false; 1032 } 1033 uint32_t image_oat_checksum = 0; 1034 if (instruction_set == kRuntimeISA) { 1035 const ImageHeader& image_header = image_space->GetImageHeader(); 1036 image_oat_checksum = image_header.GetOatChecksum(); 1037 } else { 1038 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1039 image_space->GetImageLocation().c_str(), instruction_set)); 1040 image_oat_checksum = image_header->GetOatChecksum(); 1041 } 1042 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1043} 1044 1045bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1046 const InstructionSet instruction_set, 1047 std::string* error_msg) { 1048 Runtime* runtime = Runtime::Current(); 1049 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1050 if (image_space == nullptr) { 1051 *error_msg = "No image space for verification against"; 1052 return false; 1053 } 1054 1055 // If the requested instruction set is the same as the current runtime, 1056 // we can use the checksums directly. If it isn't, we'll have to read the 1057 // image header from the image for the right instruction set. 1058 uint32_t image_oat_checksum = 0; 1059 uintptr_t image_oat_data_begin = 0; 1060 int32_t image_patch_delta = 0; 1061 if (instruction_set == Runtime::Current()->GetInstructionSet()) { 1062 const ImageHeader& image_header = image_space->GetImageHeader(); 1063 image_oat_checksum = image_header.GetOatChecksum(); 1064 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1065 image_patch_delta = image_header.GetPatchDelta(); 1066 } else { 1067 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1068 image_space->GetImageLocation().c_str(), instruction_set)); 1069 image_oat_checksum = image_header->GetOatChecksum(); 1070 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1071 image_patch_delta = image_header->GetPatchDelta(); 1072 } 1073 const OatHeader& oat_header = oat_file->GetOatHeader(); 1074 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1075 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1076 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1077 if (!ret) { 1078 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1079 oat_file->GetLocation().c_str(), 1080 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1081 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1082 oat_file->GetOatHeader().GetImagePatchDelta(), 1083 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1084 } 1085 return ret; 1086} 1087 1088bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1089 const char* dex_location, 1090 uint32_t dex_location_checksum, 1091 const InstructionSet instruction_set, 1092 std::string* error_msg) { 1093 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1094 return false; 1095 } 1096 1097 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1098 &dex_location_checksum); 1099 if (oat_dex_file == NULL) { 1100 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1101 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1102 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 1103 for (size_t i = 0; i < oat_dex_files.size(); i++) { 1104 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 1105 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 1106 oat_file->GetLocation().c_str(), 1107 oat_dex_file->GetDexFileLocation().c_str()); 1108 } 1109 return false; 1110 } 1111 1112 if (dex_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) { 1113 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1114 oat_file->GetLocation().c_str(), 1115 oat_dex_file->GetDexFileLocationChecksum(), 1116 dex_location, dex_location_checksum); 1117 return false; 1118 } 1119 return true; 1120} 1121 1122bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1123 const char* dex_location, 1124 std::string* error_msg) { 1125 CHECK(oat_file != nullptr); 1126 CHECK(dex_location != nullptr); 1127 std::unique_ptr<const DexFile> dex_file; 1128 uint32_t dex_location_checksum; 1129 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 1130 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1131 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1132 // directory. 1133 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1134 if (oat_dex_file == nullptr) { 1135 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1136 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1137 error_msg->c_str()); 1138 return false; 1139 } 1140 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1141 } else { 1142 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, dex_location_checksum, 1143 kRuntimeISA, error_msg); 1144 if (!verified) { 1145 return false; 1146 } 1147 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1148 &dex_location_checksum)->OpenDexFile(error_msg)); 1149 } 1150 return dex_file.get() != nullptr; 1151} 1152 1153const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1154 const char* dex_location, 1155 const uint32_t* const dex_location_checksum, 1156 InstructionSet isa, 1157 std::vector<std::string>* error_msgs, 1158 bool* obsolete_file_cleanup_failed) { 1159 *obsolete_file_cleanup_failed = false; 1160 bool already_opened = false; 1161 std::string dex_location_str(dex_location); 1162 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1163 &already_opened, 1164 obsolete_file_cleanup_failed, 1165 error_msgs)); 1166 std::string error_msg; 1167 if (oat_file.get() == nullptr) { 1168 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1169 dex_location)); 1170 return nullptr; 1171 } else if (oat_file->IsExecutable() && 1172 !VerifyOatWithDexFile(oat_file.get(), dex_location, &error_msg)) { 1173 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1174 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1175 error_msg.c_str())); 1176 return nullptr; 1177 } else if (!oat_file->IsExecutable() && 1178 Runtime::Current()->GetHeap()->HasImageSpace() && 1179 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1180 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1181 "dex location '%s'. Image checksum incorrect.", 1182 oat_file->GetLocation().c_str(), dex_location)); 1183 return nullptr; 1184 } else { 1185 return oat_file.release(); 1186 } 1187} 1188 1189const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1190 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1191 for (size_t i = 0; i < oat_files_.size(); i++) { 1192 const OatFile* oat_file = oat_files_[i]; 1193 DCHECK(oat_file != nullptr); 1194 if (oat_file->GetLocation() == oat_location) { 1195 return oat_file; 1196 } 1197 } 1198 return nullptr; 1199} 1200 1201const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1202 InstructionSet isa, 1203 bool *already_opened, 1204 bool *obsolete_file_cleanup_failed, 1205 std::vector<std::string>* error_msgs) { 1206 // Find out if we've already opened the file 1207 const OatFile* ret = nullptr; 1208 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1209 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1210 if (ret != nullptr) { 1211 *already_opened = true; 1212 return ret; 1213 } 1214 1215 std::string dalvik_cache; 1216 bool have_android_data = false; 1217 bool have_dalvik_cache = false; 1218 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1219 &have_android_data, &have_dalvik_cache); 1220 std::string cache_filename; 1221 if (have_dalvik_cache) { 1222 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1223 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1224 if (ret != nullptr) { 1225 *already_opened = true; 1226 return ret; 1227 } 1228 } else { 1229 // If we need to relocate we should just place odex back where it started. 1230 cache_filename = odex_filename; 1231 } 1232 1233 ret = nullptr; 1234 1235 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1236 // 1237 // Now we do the following: 1238 // 1) Try and open the odex version 1239 // 2) If present, checksum-verified & relocated correctly return it 1240 // 3) Close the odex version to free up its address space. 1241 // 4) Try and open the cache version 1242 // 5) If present, checksum-verified & relocated correctly return it 1243 // 6) Close the cache version to free up its address space. 1244 // 7) If we should relocate: 1245 // a) If we have opened and checksum-verified the odex version relocate it to 1246 // 'cache_filename' and return it 1247 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1248 // it. This should not happen often (I think only the run-test's will hit this case). 1249 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1250 // this point. 1251 // 9) Return nullptr 1252 1253 *already_opened = false; 1254 const Runtime* runtime = Runtime::Current(); 1255 CHECK(runtime != nullptr); 1256 bool executable = !runtime->IsCompiler(); 1257 1258 std::string odex_error_msg; 1259 bool should_patch_system = false; 1260 bool odex_checksum_verified = false; 1261 bool have_system_odex = false; 1262 { 1263 // There is a high probability that these both these oat files map similar/the same address 1264 // spaces so we must scope them like this so they each gets its turn. 1265 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, NULL, 1266 executable, &odex_error_msg)); 1267 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1268 &odex_checksum_verified, 1269 &odex_error_msg)) { 1270 error_msgs->push_back(odex_error_msg); 1271 return odex_oat_file.release(); 1272 } else { 1273 if (odex_checksum_verified) { 1274 // We can just relocate 1275 should_patch_system = true; 1276 odex_error_msg = "Image Patches are incorrect"; 1277 } 1278 if (odex_oat_file.get() != nullptr) { 1279 have_system_odex = true; 1280 } 1281 } 1282 } 1283 1284 std::string cache_error_msg; 1285 bool should_patch_cache = false; 1286 bool cache_checksum_verified = false; 1287 if (have_dalvik_cache) { 1288 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, NULL, 1289 executable, &cache_error_msg)); 1290 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1291 &cache_checksum_verified, 1292 &cache_error_msg)) { 1293 error_msgs->push_back(cache_error_msg); 1294 return cache_oat_file.release(); 1295 } else if (cache_checksum_verified) { 1296 // We can just relocate 1297 should_patch_cache = true; 1298 cache_error_msg = "Image Patches are incorrect"; 1299 } 1300 } else if (have_android_data) { 1301 // dalvik_cache does not exist but android data does. This means we should be able to create 1302 // it, so we should try. 1303 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1304 } 1305 1306 ret = nullptr; 1307 std::string error_msg; 1308 if (runtime->CanRelocate()) { 1309 // Run relocation 1310 gc::space::ImageSpace* space = Runtime::Current()->GetHeap()->GetImageSpace(); 1311 if (space != nullptr) { 1312 const std::string& image_location = space->GetImageLocation(); 1313 if (odex_checksum_verified && should_patch_system) { 1314 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1315 } else if (cache_checksum_verified && should_patch_cache) { 1316 CHECK(have_dalvik_cache); 1317 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1318 } 1319 } else if (have_system_odex) { 1320 ret = GetInterpretedOnlyOat(odex_filename, isa, &error_msg); 1321 } 1322 } 1323 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1324 // implicitly: were able to fine where the cached version is but we were unable to use it, 1325 // either as a destination for relocation or to open a file. We should delete it if it is 1326 // there. 1327 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1328 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1329 "searching for dex file %s: %s", 1330 cache_filename.c_str(), dex_location.c_str(), 1331 strerror(errno)); 1332 error_msgs->push_back(rm_error_msg); 1333 VLOG(class_linker) << rm_error_msg; 1334 // Let the caller know that we couldn't remove the obsolete file. 1335 // This is a good indication that further writes may fail as well. 1336 *obsolete_file_cleanup_failed = true; 1337 } 1338 } 1339 if (ret == nullptr) { 1340 VLOG(class_linker) << error_msg; 1341 error_msgs->push_back(error_msg); 1342 std::string relocation_msg; 1343 if (runtime->CanRelocate()) { 1344 relocation_msg = StringPrintf(" and relocation failed"); 1345 } 1346 if (have_dalvik_cache && cache_checksum_verified) { 1347 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1348 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1349 cache_filename.c_str(), cache_error_msg.c_str(), 1350 relocation_msg.c_str()); 1351 } else { 1352 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1353 "dalvik_cache availible)%s.", odex_filename.c_str(), 1354 odex_error_msg.c_str(), relocation_msg.c_str()); 1355 } 1356 VLOG(class_linker) << error_msg; 1357 error_msgs->push_back(error_msg); 1358 } 1359 return ret; 1360} 1361 1362const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1363 InstructionSet isa, 1364 std::string* error_msg) { 1365 // We open it non-executable 1366 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, NULL, false, error_msg)); 1367 if (output.get() == nullptr) { 1368 return nullptr; 1369 } 1370 if (!Runtime::Current()->GetHeap()->HasImageSpace() || 1371 VerifyOatImageChecksum(output.get(), isa)) { 1372 return output.release(); 1373 } else { 1374 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1375 oat_path.c_str()); 1376 return nullptr; 1377 } 1378} 1379 1380const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1381 const std::string& output_oat, 1382 const std::string& image_location, 1383 InstructionSet isa, 1384 std::string* error_msg) { 1385 if (!Runtime::Current()->GetHeap()->HasImageSpace()) { 1386 // We don't have an image space so there is no point in trying to patchoat. 1387 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted because we are " 1388 << "running without an image. Attempting to use oat file for interpretation."; 1389 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1390 } 1391 if (!Runtime::Current()->IsDex2OatEnabled()) { 1392 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1393 // input_oat but make sure we only do interpretation on it's dex files. 1394 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1395 << "disabled. Attempting to use oat file for interpretation"; 1396 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1397 } 1398 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1399 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1400 1401 std::string isa_arg("--instruction-set="); 1402 isa_arg += GetInstructionSetString(isa); 1403 std::string input_oat_filename_arg("--input-oat-file="); 1404 input_oat_filename_arg += input_oat; 1405 std::string output_oat_filename_arg("--output-oat-file="); 1406 output_oat_filename_arg += output_oat; 1407 std::string patched_image_arg("--patched-image-location="); 1408 patched_image_arg += image_location; 1409 1410 std::vector<std::string> argv; 1411 argv.push_back(patchoat); 1412 argv.push_back(isa_arg); 1413 argv.push_back(input_oat_filename_arg); 1414 argv.push_back(output_oat_filename_arg); 1415 argv.push_back(patched_image_arg); 1416 1417 std::string command_line(Join(argv, ' ')); 1418 LOG(INFO) << "Relocate Oat File: " << command_line; 1419 bool success = Exec(argv, error_msg); 1420 if (success) { 1421 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, NULL, 1422 !Runtime::Current()->IsCompiler(), error_msg)); 1423 bool checksum_verified = false; 1424 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1425 return output.release(); 1426 } else if (output.get() != nullptr) { 1427 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1428 "but output file '%s' failed verifcation: %s", 1429 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1430 } else { 1431 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1432 "but was unable to open output file '%s': %s", 1433 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1434 } 1435 } else if (!Runtime::Current()->IsCompiler()) { 1436 // patchoat failed which means we probably don't have enough room to place the output oat file, 1437 // instead of failing we should just run the interpreter from the dex files in the input oat. 1438 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1439 << "for interpretation. patchoat failure was: " << *error_msg; 1440 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1441 } else { 1442 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1443 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1444 error_msg->c_str()); 1445 } 1446 return nullptr; 1447} 1448 1449int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1450 Runtime* runtime = Runtime::Current(); 1451 int32_t real_patch_delta; 1452 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1453 CHECK(image_space != nullptr); 1454 if (isa == Runtime::Current()->GetInstructionSet()) { 1455 const ImageHeader& image_header = image_space->GetImageHeader(); 1456 real_patch_delta = image_header.GetPatchDelta(); 1457 } else { 1458 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1459 image_space->GetImageLocation().c_str(), isa)); 1460 real_patch_delta = image_header->GetPatchDelta(); 1461 } 1462 const OatHeader& oat_header = oat_file->GetOatHeader(); 1463 return real_patch_delta - oat_header.GetImagePatchDelta(); 1464} 1465 1466bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1467 bool* checksum_verified, 1468 std::string* error_msg) { 1469 std::string compound_msg("Oat file failed to verify: "); 1470 Runtime* runtime = Runtime::Current(); 1471 uint32_t real_image_checksum; 1472 void* real_image_oat_offset; 1473 int32_t real_patch_delta; 1474 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1475 if (image_space == nullptr) { 1476 *error_msg = "No image space present"; 1477 return false; 1478 } 1479 if (isa == Runtime::Current()->GetInstructionSet()) { 1480 const ImageHeader& image_header = image_space->GetImageHeader(); 1481 real_image_checksum = image_header.GetOatChecksum(); 1482 real_image_oat_offset = image_header.GetOatDataBegin(); 1483 real_patch_delta = image_header.GetPatchDelta(); 1484 } else { 1485 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1486 image_space->GetImageLocation().c_str(), isa)); 1487 real_image_checksum = image_header->GetOatChecksum(); 1488 real_image_oat_offset = image_header->GetOatDataBegin(); 1489 real_patch_delta = image_header->GetPatchDelta(); 1490 } 1491 1492 const OatHeader& oat_header = oat_file->GetOatHeader(); 1493 1494 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1495 *checksum_verified = oat_image_checksum == real_image_checksum; 1496 if (!*checksum_verified) { 1497 compound_msg += StringPrintf(" Oat Image Checksum Incorrect (expected 0x%x, recieved 0x%x)", 1498 real_image_checksum, oat_image_checksum); 1499 } 1500 1501 void* oat_image_oat_offset = 1502 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1503 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1504 if (!offset_verified) { 1505 compound_msg += StringPrintf(" Oat Image oat offset incorrect (expected 0x%p, recieved 0x%p)", 1506 real_image_oat_offset, oat_image_oat_offset); 1507 } 1508 1509 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1510 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1511 if (!patch_delta_verified) { 1512 compound_msg += StringPrintf(" Oat image patch delta incorrect (expected 0x%x, recieved 0x%x)", 1513 real_patch_delta, oat_patch_delta); 1514 } 1515 1516 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1517 if (ret) { 1518 *error_msg = compound_msg; 1519 } 1520 return ret; 1521} 1522 1523const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1524 std::string* error_msg) { 1525 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1526 if (oat_file != nullptr) { 1527 return oat_file; 1528 } 1529 1530 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1531 error_msg); 1532 if (oat_file == NULL) { 1533 return NULL; 1534 } 1535 return oat_file; 1536} 1537 1538static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1539 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1540 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1541 1542 DCHECK(obj != NULL); 1543 DCHECK(class_linker != NULL); 1544 1545 if (obj->IsArtMethod()) { 1546 mirror::ArtMethod* method = obj->AsArtMethod(); 1547 if (!method->IsNative()) { 1548 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1549 if (method != Runtime::Current()->GetResolutionMethod()) { 1550 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1551 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1552 } 1553 } 1554 } 1555} 1556 1557void ClassLinker::InitFromImage() { 1558 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1559 CHECK(!init_done_); 1560 1561 Thread* self = Thread::Current(); 1562 gc::Heap* heap = Runtime::Current()->GetHeap(); 1563 gc::space::ImageSpace* space = heap->GetImageSpace(); 1564 dex_cache_image_class_lookup_required_ = true; 1565 CHECK(space != NULL); 1566 OatFile& oat_file = GetImageOatFile(space); 1567 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1568 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1569 const char* image_file_location = oat_file.GetOatHeader(). 1570 GetStoreValueByKey(OatHeader::kImageLocationKey); 1571 CHECK(image_file_location == nullptr || *image_file_location == 0); 1572 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1573 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1574 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1575 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1576 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1577 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1578 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1579 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1580 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1581 1582 StackHandleScope<1> hs(self); 1583 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1584 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1585 AsObjectArray<mirror::Class>())); 1586 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1587 1588 // Special case of setting up the String class early so that we can test arbitrary objects 1589 // as being Strings or not 1590 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1591 1592 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1593 static_cast<uint32_t>(dex_caches->GetLength())); 1594 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1595 StackHandleScope<1> hs(self); 1596 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1597 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1598 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1599 nullptr); 1600 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1601 std::string error_msg; 1602 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1603 if (dex_file == NULL) { 1604 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1605 << " from within oat file " << oat_file.GetLocation() 1606 << " error '" << error_msg << "'"; 1607 } 1608 1609 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1610 1611 AppendToBootClassPath(*dex_file, dex_cache); 1612 } 1613 1614 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1615 // bitmap walk. 1616 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1617 1618 // Set entry point to interpreter if in InterpretOnly mode. 1619 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1620 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1621 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1622 } 1623 1624 // reinit class_roots_ 1625 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1626 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1627 1628 // reinit array_iftable_ from any array class instance, they should be == 1629 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1630 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1631 // String class root was set above 1632 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1633 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1634 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1635 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1636 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1637 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1638 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1639 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1640 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1641 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1642 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1643 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1644 1645 FinishInit(self); 1646 1647 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1648} 1649 1650void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1651 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1652 if ((flags & kVisitRootFlagAllRoots) != 0) { 1653 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1654 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1655 } 1656 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1657 for (auto& pair : new_class_roots_) { 1658 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1659 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1660 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1661 if (UNLIKELY(new_ref != old_ref)) { 1662 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1663 // corresponding object. This is slow, but luckily for us, this may only happen with a 1664 // concurrent moving GC. 1665 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1666 it != end && it->first == pair.first; ++it) { 1667 // If the class stored matches the old class, update it to the new value. 1668 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1669 it->second = GcRoot<mirror::Class>(new_ref); 1670 } 1671 } 1672 } 1673 } 1674 } 1675 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1676 new_class_roots_.clear(); 1677 } 1678 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1679 log_new_class_table_roots_ = true; 1680 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1681 log_new_class_table_roots_ = false; 1682 } 1683 // We deliberately ignore the class roots in the image since we 1684 // handle image roots by using the MS/CMS rescanning of dirty cards. 1685} 1686 1687// Keep in sync with InitCallback. Anything we visit, we need to 1688// reinit references to when reinitializing a ClassLinker from a 1689// mapped image. 1690void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1691 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1692 Thread* self = Thread::Current(); 1693 { 1694 ReaderMutexLock mu(self, dex_lock_); 1695 if ((flags & kVisitRootFlagAllRoots) != 0) { 1696 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1697 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1698 } 1699 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1700 for (size_t index : new_dex_cache_roots_) { 1701 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1702 } 1703 } 1704 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1705 new_dex_cache_roots_.clear(); 1706 } 1707 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1708 log_new_dex_caches_roots_ = true; 1709 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1710 log_new_dex_caches_roots_ = false; 1711 } 1712 } 1713 VisitClassRoots(callback, arg, flags); 1714 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1715 DCHECK(!array_iftable_.IsNull()); 1716 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1717 if (!find_array_class_cache_[i].IsNull()) { 1718 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1719 } 1720 } 1721} 1722 1723void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1724 if (dex_cache_image_class_lookup_required_) { 1725 MoveImageClassesToClassTable(); 1726 } 1727 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1728 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1729 mirror::Class* c = it.second.Read(); 1730 if (!visitor(c, arg)) { 1731 return; 1732 } 1733 } 1734} 1735 1736static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1737 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1738 classes->insert(c); 1739 return true; 1740} 1741 1742void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1743 std::set<mirror::Class*> classes; 1744 VisitClasses(GetClassesVisitor, &classes); 1745 for (mirror::Class* klass : classes) { 1746 if (!visitor(klass, arg)) { 1747 return; 1748 } 1749 } 1750} 1751 1752ClassLinker::~ClassLinker() { 1753 mirror::Class::ResetClass(); 1754 mirror::String::ResetClass(); 1755 mirror::Reference::ResetClass(); 1756 mirror::ArtField::ResetClass(); 1757 mirror::ArtMethod::ResetClass(); 1758 mirror::BooleanArray::ResetArrayClass(); 1759 mirror::ByteArray::ResetArrayClass(); 1760 mirror::CharArray::ResetArrayClass(); 1761 mirror::DoubleArray::ResetArrayClass(); 1762 mirror::FloatArray::ResetArrayClass(); 1763 mirror::IntArray::ResetArrayClass(); 1764 mirror::LongArray::ResetArrayClass(); 1765 mirror::ShortArray::ResetArrayClass(); 1766 mirror::Throwable::ResetClass(); 1767 mirror::StackTraceElement::ResetClass(); 1768 STLDeleteElements(&boot_class_path_); 1769 STLDeleteElements(&oat_files_); 1770} 1771 1772mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1773 gc::Heap* heap = Runtime::Current()->GetHeap(); 1774 StackHandleScope<16> hs(self); 1775 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1776 Handle<mirror::DexCache> dex_cache( 1777 hs.NewHandle(down_cast<mirror::DexCache*>( 1778 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1779 VoidFunctor())))); 1780 if (dex_cache.Get() == NULL) { 1781 return NULL; 1782 } 1783 Handle<mirror::String> 1784 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1785 if (location.Get() == NULL) { 1786 return NULL; 1787 } 1788 Handle<mirror::ObjectArray<mirror::String>> 1789 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1790 if (strings.Get() == NULL) { 1791 return NULL; 1792 } 1793 Handle<mirror::ObjectArray<mirror::Class>> 1794 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1795 if (types.Get() == NULL) { 1796 return NULL; 1797 } 1798 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1799 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1800 if (methods.Get() == NULL) { 1801 return NULL; 1802 } 1803 Handle<mirror::ObjectArray<mirror::ArtField>> 1804 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1805 if (fields.Get() == NULL) { 1806 return NULL; 1807 } 1808 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1809 fields.Get()); 1810 return dex_cache.Get(); 1811} 1812 1813mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1814 uint32_t class_size) { 1815 DCHECK_GE(class_size, sizeof(mirror::Class)); 1816 gc::Heap* heap = Runtime::Current()->GetHeap(); 1817 mirror::Class::InitializeClassVisitor visitor(class_size); 1818 mirror::Object* k = kMovingClasses ? 1819 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1820 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1821 if (UNLIKELY(k == nullptr)) { 1822 CHECK(self->IsExceptionPending()); // OOME. 1823 return nullptr; 1824 } 1825 return k->AsClass(); 1826} 1827 1828mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1829 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1830} 1831 1832mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1833 return down_cast<mirror::ArtField*>( 1834 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1835} 1836 1837mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1838 return down_cast<mirror::ArtMethod*>( 1839 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1840} 1841 1842mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1843 Thread* self, size_t length) { 1844 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1845 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1846} 1847 1848mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1849 mirror::Class* klass) { 1850 DCHECK(klass != NULL); 1851 1852 // For temporary classes we must wait for them to be retired. 1853 if (init_done_ && klass->IsTemp()) { 1854 CHECK(!klass->IsResolved()); 1855 if (klass->IsErroneous()) { 1856 ThrowEarlierClassFailure(klass); 1857 return nullptr; 1858 } 1859 StackHandleScope<1> hs(self); 1860 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1861 ObjectLock<mirror::Class> lock(self, h_class); 1862 // Loop and wait for the resolving thread to retire this class. 1863 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1864 lock.WaitIgnoringInterrupts(); 1865 } 1866 if (h_class->IsErroneous()) { 1867 ThrowEarlierClassFailure(h_class.Get()); 1868 return nullptr; 1869 } 1870 CHECK(h_class->IsRetired()); 1871 // Get the updated class from class table. 1872 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1873 } 1874 1875 // Wait for the class if it has not already been linked. 1876 if (!klass->IsResolved() && !klass->IsErroneous()) { 1877 StackHandleScope<1> hs(self); 1878 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1879 ObjectLock<mirror::Class> lock(self, h_class); 1880 // Check for circular dependencies between classes. 1881 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1882 ThrowClassCircularityError(h_class.Get()); 1883 h_class->SetStatus(mirror::Class::kStatusError, self); 1884 return nullptr; 1885 } 1886 // Wait for the pending initialization to complete. 1887 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1888 lock.WaitIgnoringInterrupts(); 1889 } 1890 } 1891 1892 if (klass->IsErroneous()) { 1893 ThrowEarlierClassFailure(klass); 1894 return nullptr; 1895 } 1896 // Return the loaded class. No exceptions should be pending. 1897 CHECK(klass->IsResolved()) << PrettyClass(klass); 1898 self->AssertNoPendingException(); 1899 return klass; 1900} 1901 1902typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry; 1903 1904// Search a collection of DexFiles for a descriptor 1905ClassPathEntry FindInClassPath(const char* descriptor, 1906 const std::vector<const DexFile*>& class_path) { 1907 for (size_t i = 0; i != class_path.size(); ++i) { 1908 const DexFile* dex_file = class_path[i]; 1909 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor); 1910 if (dex_class_def != NULL) { 1911 return ClassPathEntry(dex_file, dex_class_def); 1912 } 1913 } 1914 // TODO: remove reinterpret_cast when issue with -std=gnu++0x host issue resolved 1915 return ClassPathEntry(reinterpret_cast<const DexFile*>(NULL), 1916 reinterpret_cast<const DexFile::ClassDef*>(NULL)); 1917} 1918 1919mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1920 Handle<mirror::ClassLoader> class_loader) { 1921 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1922 DCHECK(self != nullptr); 1923 self->AssertNoPendingException(); 1924 if (descriptor[1] == '\0') { 1925 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1926 // for primitive classes that aren't backed by dex files. 1927 return FindPrimitiveClass(descriptor[0]); 1928 } 1929 // Find the class in the loaded classes table. 1930 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1931 if (klass != nullptr) { 1932 return EnsureResolved(self, descriptor, klass); 1933 } 1934 // Class is not yet loaded. 1935 if (descriptor[0] == '[') { 1936 return CreateArrayClass(self, descriptor, class_loader); 1937 } else if (class_loader.Get() == nullptr) { 1938 // The boot class loader, search the boot class path. 1939 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 1940 if (pair.second != nullptr) { 1941 StackHandleScope<1> hs(self); 1942 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1943 } else { 1944 // The boot class loader is searched ahead of the application class loader, failures are 1945 // expected and will be wrapped in a ClassNotFoundException. Use the pre-allocated error to 1946 // trigger the chaining with a proper stack trace. 1947 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError(); 1948 self->SetException(ThrowLocation(), pre_allocated); 1949 return nullptr; 1950 } 1951 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1952 // First try with the bootstrap class loader. 1953 if (class_loader.Get() != nullptr) { 1954 klass = LookupClass(descriptor, nullptr); 1955 if (klass != nullptr) { 1956 return EnsureResolved(self, descriptor, klass); 1957 } 1958 } 1959 // If the lookup failed search the boot class path. We don't perform a recursive call to avoid 1960 // a NoClassDefFoundError being allocated. 1961 ClassPathEntry pair = FindInClassPath(descriptor, boot_class_path_); 1962 if (pair.second != nullptr) { 1963 StackHandleScope<1> hs(self); 1964 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1965 } 1966 // Next try the compile time class path. 1967 const std::vector<const DexFile*>* class_path; 1968 { 1969 ScopedObjectAccessUnchecked soa(self); 1970 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1971 soa.AddLocalReference<jobject>(class_loader.Get())); 1972 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1973 } 1974 pair = FindInClassPath(descriptor, *class_path); 1975 if (pair.second != nullptr) { 1976 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1977 } 1978 } else { 1979 ScopedObjectAccessUnchecked soa(self); 1980 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1981 soa.AddLocalReference<jobject>(class_loader.Get())); 1982 std::string class_name_string(DescriptorToDot(descriptor)); 1983 ScopedLocalRef<jobject> result(soa.Env(), nullptr); 1984 { 1985 ScopedThreadStateChange tsc(self, kNative); 1986 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1987 soa.Env()->NewStringUTF(class_name_string.c_str())); 1988 if (class_name_object.get() == nullptr) { 1989 DCHECK(self->IsExceptionPending()); // OOME. 1990 return nullptr; 1991 } 1992 CHECK(class_loader_object.get() != nullptr); 1993 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1994 WellKnownClasses::java_lang_ClassLoader_loadClass, 1995 class_name_object.get())); 1996 } 1997 if (self->IsExceptionPending()) { 1998 // If the ClassLoader threw, pass that exception up. 1999 return nullptr; 2000 } else if (result.get() == nullptr) { 2001 // broken loader - throw NPE to be compatible with Dalvik 2002 ThrowNullPointerException(nullptr, StringPrintf("ClassLoader.loadClass returned null for %s", 2003 class_name_string.c_str()).c_str()); 2004 return nullptr; 2005 } else { 2006 // success, return mirror::Class* 2007 return soa.Decode<mirror::Class*>(result.get()); 2008 } 2009 } 2010 2011 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 2012 return nullptr; 2013} 2014 2015mirror::Class* ClassLinker::DefineClass(const char* descriptor, 2016 Handle<mirror::ClassLoader> class_loader, 2017 const DexFile& dex_file, 2018 const DexFile::ClassDef& dex_class_def) { 2019 Thread* self = Thread::Current(); 2020 StackHandleScope<3> hs(self); 2021 auto klass = hs.NewHandle<mirror::Class>(nullptr); 2022 bool should_allocate = false; 2023 2024 // Load the class from the dex file. 2025 if (UNLIKELY(!init_done_)) { 2026 // finish up init of hand crafted class_roots_ 2027 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 2028 klass.Assign(GetClassRoot(kJavaLangObject)); 2029 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 2030 klass.Assign(GetClassRoot(kJavaLangClass)); 2031 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 2032 klass.Assign(GetClassRoot(kJavaLangString)); 2033 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 2034 klass.Assign(GetClassRoot(kJavaLangRefReference)); 2035 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 2036 klass.Assign(GetClassRoot(kJavaLangDexCache)); 2037 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 2038 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 2039 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 2040 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 2041 } else { 2042 should_allocate = true; 2043 } 2044 } else { 2045 should_allocate = true; 2046 } 2047 2048 if (should_allocate) { 2049 // Allocate a class with the status of not ready. 2050 // Interface object should get the right size here. Regular class will 2051 // figure out the right size later and be replaced with one of the right 2052 // size when the class becomes resolved. 2053 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 2054 } 2055 if (UNLIKELY(klass.Get() == nullptr)) { 2056 CHECK(self->IsExceptionPending()); // Expect an OOME. 2057 return nullptr; 2058 } 2059 klass->SetDexCache(FindDexCache(dex_file)); 2060 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 2061 ObjectLock<mirror::Class> lock(self, klass); 2062 if (self->IsExceptionPending()) { 2063 // An exception occured during load, set status to erroneous while holding klass' lock in case 2064 // notification is necessary. 2065 if (!klass->IsErroneous()) { 2066 klass->SetStatus(mirror::Class::kStatusError, self); 2067 } 2068 return nullptr; 2069 } 2070 klass->SetClinitThreadId(self->GetTid()); 2071 2072 // Add the newly loaded class to the loaded classes table. 2073 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 2074 if (existing != nullptr) { 2075 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 2076 // this thread to block. 2077 return EnsureResolved(self, descriptor, existing); 2078 } 2079 2080 // Finish loading (if necessary) by finding parents 2081 CHECK(!klass->IsLoaded()); 2082 if (!LoadSuperAndInterfaces(klass, dex_file)) { 2083 // Loading failed. 2084 if (!klass->IsErroneous()) { 2085 klass->SetStatus(mirror::Class::kStatusError, self); 2086 } 2087 return nullptr; 2088 } 2089 CHECK(klass->IsLoaded()); 2090 // Link the class (if necessary) 2091 CHECK(!klass->IsResolved()); 2092 // TODO: Use fast jobjects? 2093 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2094 2095 mirror::Class* new_class = nullptr; 2096 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2097 // Linking failed. 2098 if (!klass->IsErroneous()) { 2099 klass->SetStatus(mirror::Class::kStatusError, self); 2100 } 2101 return nullptr; 2102 } 2103 self->AssertNoPendingException(); 2104 CHECK(new_class != nullptr) << descriptor; 2105 CHECK(new_class->IsResolved()) << descriptor; 2106 2107 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2108 2109 /* 2110 * We send CLASS_PREPARE events to the debugger from here. The 2111 * definition of "preparation" is creating the static fields for a 2112 * class and initializing them to the standard default values, but not 2113 * executing any code (that comes later, during "initialization"). 2114 * 2115 * We did the static preparation in LinkClass. 2116 * 2117 * The class has been prepared and resolved but possibly not yet verified 2118 * at this point. 2119 */ 2120 Dbg::PostClassPrepare(new_class_h.Get()); 2121 2122 return new_class_h.Get(); 2123} 2124 2125uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2126 const DexFile::ClassDef& dex_class_def) { 2127 const byte* class_data = dex_file.GetClassData(dex_class_def); 2128 size_t num_ref = 0; 2129 size_t num_32 = 0; 2130 size_t num_64 = 0; 2131 if (class_data != NULL) { 2132 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2133 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2134 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2135 char c = descriptor[0]; 2136 if (c == 'L' || c == '[') { 2137 num_ref++; 2138 } else if (c == 'J' || c == 'D') { 2139 num_64++; 2140 } else { 2141 num_32++; 2142 } 2143 } 2144 } 2145 return mirror::Class::ComputeClassSize(false, 0, num_32, num_64, num_ref); 2146} 2147 2148bool ClassLinker::FindOatClass(const DexFile& dex_file, 2149 uint16_t class_def_idx, 2150 OatFile::OatClass* oat_class) { 2151 DCHECK(oat_class != nullptr); 2152 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2153 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2154 if (oat_file == nullptr) { 2155 return false; 2156 } 2157 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2158 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2159 &dex_location_checksum); 2160 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 2161 *oat_class = oat_dex_file->GetOatClass(class_def_idx); 2162 return true; 2163} 2164 2165static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2166 uint32_t method_idx) { 2167 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2168 const byte* class_data = dex_file.GetClassData(class_def); 2169 CHECK(class_data != NULL); 2170 ClassDataItemIterator it(dex_file, class_data); 2171 // Skip fields 2172 while (it.HasNextStaticField()) { 2173 it.Next(); 2174 } 2175 while (it.HasNextInstanceField()) { 2176 it.Next(); 2177 } 2178 // Process methods 2179 size_t class_def_method_index = 0; 2180 while (it.HasNextDirectMethod()) { 2181 if (it.GetMemberIndex() == method_idx) { 2182 return class_def_method_index; 2183 } 2184 class_def_method_index++; 2185 it.Next(); 2186 } 2187 while (it.HasNextVirtualMethod()) { 2188 if (it.GetMemberIndex() == method_idx) { 2189 return class_def_method_index; 2190 } 2191 class_def_method_index++; 2192 it.Next(); 2193 } 2194 DCHECK(!it.HasNext()); 2195 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2196 return 0; 2197} 2198 2199bool ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, OatFile::OatMethod* oat_method) { 2200 DCHECK(oat_method != nullptr); 2201 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2202 // method for direct methods (or virtual methods made direct). 2203 mirror::Class* declaring_class = method->GetDeclaringClass(); 2204 size_t oat_method_index; 2205 if (method->IsStatic() || method->IsDirect()) { 2206 // Simple case where the oat method index was stashed at load time. 2207 oat_method_index = method->GetMethodIndex(); 2208 } else { 2209 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2210 // by search for its position in the declared virtual methods. 2211 oat_method_index = declaring_class->NumDirectMethods(); 2212 size_t end = declaring_class->NumVirtualMethods(); 2213 bool found = false; 2214 for (size_t i = 0; i < end; i++) { 2215 // Check method index instead of identity in case of duplicate method definitions. 2216 if (method->GetDexMethodIndex() == 2217 declaring_class->GetVirtualMethod(i)->GetDexMethodIndex()) { 2218 found = true; 2219 break; 2220 } 2221 oat_method_index++; 2222 } 2223 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2224 } 2225 DCHECK_EQ(oat_method_index, 2226 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2227 method->GetDeclaringClass()->GetDexClassDefIndex(), 2228 method->GetDexMethodIndex())); 2229 OatFile::OatClass oat_class; 2230 if (!FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2231 declaring_class->GetDexClassDefIndex(), 2232 &oat_class)) { 2233 return false; 2234 } 2235 2236 *oat_method = oat_class.GetOatMethod(oat_method_index); 2237 return true; 2238} 2239 2240// Special case to get oat code without overwriting a trampoline. 2241const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2242 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2243 if (method->IsProxyMethod()) { 2244 return GetQuickProxyInvokeHandler(); 2245 } 2246 OatFile::OatMethod oat_method; 2247 const void* result = nullptr; 2248 if (FindOatMethodFor(method, &oat_method)) { 2249 result = oat_method.GetQuickCode(); 2250 } 2251 2252 if (result == nullptr) { 2253 if (method->IsNative()) { 2254 // No code and native? Use generic trampoline. 2255 result = GetQuickGenericJniTrampoline(); 2256 } else if (method->IsPortableCompiled()) { 2257 // No code? Do we expect portable code? 2258 result = GetQuickToPortableBridge(); 2259 } else { 2260 // No code? You must mean to go into the interpreter. 2261 result = GetQuickToInterpreterBridge(); 2262 } 2263 } 2264 return result; 2265} 2266 2267const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2268 bool* have_portable_code) { 2269 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2270 *have_portable_code = false; 2271 if (method->IsProxyMethod()) { 2272 return GetPortableProxyInvokeHandler(); 2273 } 2274 OatFile::OatMethod oat_method; 2275 const void* result = nullptr; 2276 const void* quick_code = nullptr; 2277 if (FindOatMethodFor(method, &oat_method)) { 2278 result = oat_method.GetPortableCode(); 2279 quick_code = oat_method.GetQuickCode(); 2280 } 2281 2282 if (result == nullptr) { 2283 if (quick_code == nullptr) { 2284 // No code? You must mean to go into the interpreter. 2285 result = GetPortableToInterpreterBridge(); 2286 } else { 2287 // No code? But there's quick code, so use a bridge. 2288 result = GetPortableToQuickBridge(); 2289 } 2290 } else { 2291 *have_portable_code = true; 2292 } 2293 return result; 2294} 2295 2296const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2297 uint32_t method_idx) { 2298 OatFile::OatClass oat_class; 2299 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2300 return nullptr; 2301 } 2302 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2303 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2304} 2305 2306const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2307 uint32_t method_idx) { 2308 OatFile::OatClass oat_class; 2309 if (!FindOatClass(dex_file, class_def_idx, &oat_class)) { 2310 return nullptr; 2311 } 2312 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2313 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2314} 2315 2316// Returns true if the method must run with interpreter, false otherwise. 2317static bool NeedsInterpreter( 2318 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2319 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2320 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2321 // No code: need interpreter. 2322 // May return true for native code, in the case of generic JNI 2323 // DCHECK(!method->IsNative()); 2324 return true; 2325 } 2326#ifdef ART_SEA_IR_MODE 2327 ScopedObjectAccess soa(Thread::Current()); 2328 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2329 LOG(INFO) << "Found " << PrettyMethod(method); 2330 return false; 2331 } 2332#endif 2333 // If interpreter mode is enabled, every method (except native and proxy) must 2334 // be run with interpreter. 2335 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2336 !method->IsNative() && !method->IsProxyMethod(); 2337} 2338 2339void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2340 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2341 if (klass->NumDirectMethods() == 0) { 2342 return; // No direct methods => no static methods. 2343 } 2344 Runtime* runtime = Runtime::Current(); 2345 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2346 if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) { 2347 return; // OAT file unavailable. 2348 } 2349 } 2350 2351 const DexFile& dex_file = klass->GetDexFile(); 2352 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2353 CHECK(dex_class_def != nullptr); 2354 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2355 // There should always be class data if there were direct methods. 2356 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2357 ClassDataItemIterator it(dex_file, class_data); 2358 // Skip fields 2359 while (it.HasNextStaticField()) { 2360 it.Next(); 2361 } 2362 while (it.HasNextInstanceField()) { 2363 it.Next(); 2364 } 2365 OatFile::OatClass oat_class; 2366 bool has_oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class); 2367 // Link the code of methods skipped by LinkCode. 2368 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2369 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2370 if (!method->IsStatic()) { 2371 // Only update static methods. 2372 continue; 2373 } 2374 const void* portable_code = nullptr; 2375 const void* quick_code = nullptr; 2376 if (has_oat_class) { 2377 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2378 portable_code = oat_method.GetPortableCode(); 2379 quick_code = oat_method.GetQuickCode(); 2380 } 2381 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2382 bool have_portable_code = false; 2383 if (enter_interpreter) { 2384 // Use interpreter entry point. 2385 // Check whether the method is native, in which case it's generic JNI. 2386 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2387 quick_code = GetQuickGenericJniTrampoline(); 2388 portable_code = GetPortableToQuickBridge(); 2389 } else { 2390 portable_code = GetPortableToInterpreterBridge(); 2391 quick_code = GetQuickToInterpreterBridge(); 2392 } 2393 } else { 2394 if (portable_code == nullptr) { 2395 portable_code = GetPortableToQuickBridge(); 2396 } else { 2397 have_portable_code = true; 2398 } 2399 if (quick_code == nullptr) { 2400 quick_code = GetQuickToPortableBridge(); 2401 } 2402 } 2403 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2404 have_portable_code); 2405 } 2406 // Ignore virtual methods on the iterator. 2407} 2408 2409void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 2410 const DexFile& dex_file, uint32_t dex_method_index, 2411 uint32_t method_index) { 2412 if (Runtime::Current()->IsCompiler()) { 2413 // The following code only applies to a non-compiler runtime. 2414 return; 2415 } 2416 // Method shouldn't have already been linked. 2417 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2418 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2419 if (oat_class != nullptr) { 2420 // Every kind of method should at least get an invoke stub from the oat_method. 2421 // non-abstract methods also get their code pointers. 2422 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2423 oat_method.LinkMethod(method.Get()); 2424 } 2425 2426 // Install entry point from interpreter. 2427 bool enter_interpreter = NeedsInterpreter(method.Get(), 2428 method->GetEntryPointFromQuickCompiledCode(), 2429 method->GetEntryPointFromPortableCompiledCode()); 2430 if (enter_interpreter && !method->IsNative()) { 2431 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2432 } else { 2433 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2434 } 2435 2436 if (method->IsAbstract()) { 2437 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2438 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2439 return; 2440 } 2441 2442 bool have_portable_code = false; 2443 if (method->IsStatic() && !method->IsConstructor()) { 2444 // For static methods excluding the class initializer, install the trampoline. 2445 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2446 // after initializing class (see ClassLinker::InitializeClass method). 2447 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2448 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2449 } else if (enter_interpreter) { 2450 if (!method->IsNative()) { 2451 // Set entry point from compiled code if there's no code or in interpreter only mode. 2452 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2453 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2454 } else { 2455 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2456 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2457 } 2458 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2459 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2460 have_portable_code = true; 2461 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2462 } else { 2463 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2464 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2465 } 2466 2467 if (method->IsNative()) { 2468 // Unregistering restores the dlsym lookup stub. 2469 method->UnregisterNative(Thread::Current()); 2470 2471 if (enter_interpreter) { 2472 // We have a native method here without code. Then it should have either the GenericJni 2473 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2474 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2475 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2476 } 2477 } 2478 2479 // Allow instrumentation its chance to hijack code. 2480 Runtime* runtime = Runtime::Current(); 2481 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2482 method->GetEntryPointFromQuickCompiledCode(), 2483 method->GetEntryPointFromPortableCompiledCode(), 2484 have_portable_code); 2485} 2486 2487void ClassLinker::LoadClass(const DexFile& dex_file, 2488 const DexFile::ClassDef& dex_class_def, 2489 Handle<mirror::Class> klass, 2490 mirror::ClassLoader* class_loader) { 2491 CHECK(klass.Get() != NULL); 2492 CHECK(klass->GetDexCache() != NULL); 2493 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2494 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2495 CHECK(descriptor != NULL); 2496 2497 klass->SetClass(GetClassRoot(kJavaLangClass)); 2498 if (kUseBakerOrBrooksReadBarrier) { 2499 klass->AssertReadBarrierPointer(); 2500 } 2501 uint32_t access_flags = dex_class_def.access_flags_; 2502 // Make sure that none of our runtime-only flags are set. 2503 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2504 klass->SetAccessFlags(access_flags); 2505 klass->SetClassLoader(class_loader); 2506 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2507 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2508 2509 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2510 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2511 2512 const byte* class_data = dex_file.GetClassData(dex_class_def); 2513 if (class_data == NULL) { 2514 return; // no fields or methods - for example a marker interface 2515 } 2516 2517 OatFile::OatClass oat_class; 2518 if (Runtime::Current()->IsStarted() 2519 && !Runtime::Current()->UseCompileTimeClassPath() 2520 && FindOatClass(dex_file, klass->GetDexClassDefIndex(), &oat_class)) { 2521 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2522 } else { 2523 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2524 } 2525} 2526 2527void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2528 const byte* class_data, 2529 Handle<mirror::Class> klass, 2530 mirror::ClassLoader* class_loader, 2531 const OatFile::OatClass* oat_class) { 2532 // Load fields. 2533 ClassDataItemIterator it(dex_file, class_data); 2534 Thread* self = Thread::Current(); 2535 if (it.NumStaticFields() != 0) { 2536 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2537 if (UNLIKELY(statics == NULL)) { 2538 CHECK(self->IsExceptionPending()); // OOME. 2539 return; 2540 } 2541 klass->SetSFields(statics); 2542 } 2543 if (it.NumInstanceFields() != 0) { 2544 mirror::ObjectArray<mirror::ArtField>* fields = 2545 AllocArtFieldArray(self, it.NumInstanceFields()); 2546 if (UNLIKELY(fields == NULL)) { 2547 CHECK(self->IsExceptionPending()); // OOME. 2548 return; 2549 } 2550 klass->SetIFields(fields); 2551 } 2552 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2553 StackHandleScope<1> hs(self); 2554 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2555 if (UNLIKELY(sfield.Get() == NULL)) { 2556 CHECK(self->IsExceptionPending()); // OOME. 2557 return; 2558 } 2559 klass->SetStaticField(i, sfield.Get()); 2560 LoadField(dex_file, it, klass, sfield); 2561 } 2562 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2563 StackHandleScope<1> hs(self); 2564 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2565 if (UNLIKELY(ifield.Get() == NULL)) { 2566 CHECK(self->IsExceptionPending()); // OOME. 2567 return; 2568 } 2569 klass->SetInstanceField(i, ifield.Get()); 2570 LoadField(dex_file, it, klass, ifield); 2571 } 2572 2573 // Load methods. 2574 if (it.NumDirectMethods() != 0) { 2575 // TODO: append direct methods to class object 2576 mirror::ObjectArray<mirror::ArtMethod>* directs = 2577 AllocArtMethodArray(self, it.NumDirectMethods()); 2578 if (UNLIKELY(directs == NULL)) { 2579 CHECK(self->IsExceptionPending()); // OOME. 2580 return; 2581 } 2582 klass->SetDirectMethods(directs); 2583 } 2584 if (it.NumVirtualMethods() != 0) { 2585 // TODO: append direct methods to class object 2586 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2587 AllocArtMethodArray(self, it.NumVirtualMethods()); 2588 if (UNLIKELY(virtuals == NULL)) { 2589 CHECK(self->IsExceptionPending()); // OOME. 2590 return; 2591 } 2592 klass->SetVirtualMethods(virtuals); 2593 } 2594 size_t class_def_method_index = 0; 2595 uint32_t last_dex_method_index = DexFile::kDexNoIndex; 2596 size_t last_class_def_method_index = 0; 2597 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2598 StackHandleScope<1> hs(self); 2599 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2600 if (UNLIKELY(method.Get() == NULL)) { 2601 CHECK(self->IsExceptionPending()); // OOME. 2602 return; 2603 } 2604 klass->SetDirectMethod(i, method.Get()); 2605 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2606 uint32_t it_method_index = it.GetMemberIndex(); 2607 if (last_dex_method_index == it_method_index) { 2608 // duplicate case 2609 method->SetMethodIndex(last_class_def_method_index); 2610 } else { 2611 method->SetMethodIndex(class_def_method_index); 2612 last_dex_method_index = it_method_index; 2613 last_class_def_method_index = class_def_method_index; 2614 } 2615 class_def_method_index++; 2616 } 2617 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2618 StackHandleScope<1> hs(self); 2619 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2620 if (UNLIKELY(method.Get() == NULL)) { 2621 CHECK(self->IsExceptionPending()); // OOME. 2622 return; 2623 } 2624 klass->SetVirtualMethod(i, method.Get()); 2625 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2626 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2627 class_def_method_index++; 2628 } 2629 DCHECK(!it.HasNext()); 2630} 2631 2632void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2633 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2634 uint32_t field_idx = it.GetMemberIndex(); 2635 dst->SetDexFieldIndex(field_idx); 2636 dst->SetDeclaringClass(klass.Get()); 2637 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2638} 2639 2640mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2641 const ClassDataItemIterator& it, 2642 Handle<mirror::Class> klass) { 2643 uint32_t dex_method_idx = it.GetMemberIndex(); 2644 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2645 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2646 2647 mirror::ArtMethod* dst = AllocArtMethod(self); 2648 if (UNLIKELY(dst == NULL)) { 2649 CHECK(self->IsExceptionPending()); // OOME. 2650 return NULL; 2651 } 2652 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2653 2654 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2655 dst->SetDexMethodIndex(dex_method_idx); 2656 dst->SetDeclaringClass(klass.Get()); 2657 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2658 2659 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2660 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2661 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2662 2663 uint32_t access_flags = it.GetMemberAccessFlags(); 2664 2665 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2666 // Set finalizable flag on declaring class. 2667 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2668 // Void return type. 2669 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged. 2670 klass->SetFinalizable(); 2671 } else { 2672 std::string temp; 2673 const char* klass_descriptor = klass->GetDescriptor(&temp); 2674 // The Enum class declares a "final" finalize() method to prevent subclasses from 2675 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2676 // subclasses, so we exclude it here. 2677 // We also want to avoid setting the flag on Object, where we know that finalize() is 2678 // empty. 2679 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2680 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2681 klass->SetFinalizable(); 2682 } 2683 } 2684 } 2685 } else if (method_name[0] == '<') { 2686 // Fix broken access flags for initializers. Bug 11157540. 2687 bool is_init = (strcmp("<init>", method_name) == 0); 2688 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2689 if (UNLIKELY(!is_init && !is_clinit)) { 2690 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2691 } else { 2692 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2693 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2694 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2695 access_flags |= kAccConstructor; 2696 } 2697 } 2698 } 2699 dst->SetAccessFlags(access_flags); 2700 2701 self->EndAssertNoThreadSuspension(old_cause); 2702 return dst; 2703} 2704 2705void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2706 Thread* self = Thread::Current(); 2707 StackHandleScope<1> hs(self); 2708 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2709 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2710 AppendToBootClassPath(dex_file, dex_cache); 2711} 2712 2713void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2714 Handle<mirror::DexCache> dex_cache) { 2715 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2716 boot_class_path_.push_back(&dex_file); 2717 RegisterDexFile(dex_file, dex_cache); 2718} 2719 2720bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2721 dex_lock_.AssertSharedHeld(Thread::Current()); 2722 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2723 mirror::DexCache* dex_cache = GetDexCache(i); 2724 if (dex_cache->GetDexFile() == &dex_file) { 2725 return true; 2726 } 2727 } 2728 return false; 2729} 2730 2731bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2732 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2733 return IsDexFileRegisteredLocked(dex_file); 2734} 2735 2736void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2737 Handle<mirror::DexCache> dex_cache) { 2738 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2739 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2740 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2741 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2742 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2743 dex_cache->SetDexFile(&dex_file); 2744 if (log_new_dex_caches_roots_) { 2745 // TODO: This is not safe if we can remove dex caches. 2746 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2747 } 2748} 2749 2750void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2751 Thread* self = Thread::Current(); 2752 { 2753 ReaderMutexLock mu(self, dex_lock_); 2754 if (IsDexFileRegisteredLocked(dex_file)) { 2755 return; 2756 } 2757 } 2758 // Don't alloc while holding the lock, since allocation may need to 2759 // suspend all threads and another thread may need the dex_lock_ to 2760 // get to a suspend point. 2761 StackHandleScope<1> hs(self); 2762 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2763 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2764 { 2765 WriterMutexLock mu(self, dex_lock_); 2766 if (IsDexFileRegisteredLocked(dex_file)) { 2767 return; 2768 } 2769 RegisterDexFileLocked(dex_file, dex_cache); 2770 } 2771} 2772 2773void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2774 Handle<mirror::DexCache> dex_cache) { 2775 WriterMutexLock mu(Thread::Current(), dex_lock_); 2776 RegisterDexFileLocked(dex_file, dex_cache); 2777} 2778 2779mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2780 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2781 // Search assuming unique-ness of dex file. 2782 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2783 mirror::DexCache* dex_cache = GetDexCache(i); 2784 if (dex_cache->GetDexFile() == &dex_file) { 2785 return dex_cache; 2786 } 2787 } 2788 // Search matching by location name. 2789 std::string location(dex_file.GetLocation()); 2790 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2791 mirror::DexCache* dex_cache = GetDexCache(i); 2792 if (dex_cache->GetDexFile()->GetLocation() == location) { 2793 return dex_cache; 2794 } 2795 } 2796 // Failure, dump diagnostic and abort. 2797 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2798 mirror::DexCache* dex_cache = GetDexCache(i); 2799 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2800 } 2801 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2802 return NULL; 2803} 2804 2805void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2806 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2807 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2808 mirror::DexCache* dex_cache = GetDexCache(i); 2809 dex_cache->Fixup(resolution_method); 2810 } 2811} 2812 2813mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2814 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 2815 if (UNLIKELY(klass == NULL)) { 2816 return NULL; 2817 } 2818 return InitializePrimitiveClass(klass, type); 2819} 2820 2821mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2822 Primitive::Type type) { 2823 CHECK(primitive_class != NULL); 2824 // Must hold lock on object when initializing. 2825 Thread* self = Thread::Current(); 2826 StackHandleScope<1> hs(self); 2827 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2828 ObjectLock<mirror::Class> lock(self, h_class); 2829 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2830 primitive_class->SetPrimitiveType(type); 2831 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2832 const char* descriptor = Primitive::Descriptor(type); 2833 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2834 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2835 return primitive_class; 2836} 2837 2838// Create an array class (i.e. the class object for the array, not the 2839// array itself). "descriptor" looks like "[C" or "[[[[B" or 2840// "[Ljava/lang/String;". 2841// 2842// If "descriptor" refers to an array of primitives, look up the 2843// primitive type's internally-generated class object. 2844// 2845// "class_loader" is the class loader of the class that's referring to 2846// us. It's used to ensure that we're looking for the element type in 2847// the right context. It does NOT become the class loader for the 2848// array class; that always comes from the base element class. 2849// 2850// Returns NULL with an exception raised on failure. 2851mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2852 Handle<mirror::ClassLoader> class_loader) { 2853 // Identify the underlying component type 2854 CHECK_EQ('[', descriptor[0]); 2855 StackHandleScope<2> hs(self); 2856 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2857 if (component_type.Get() == nullptr) { 2858 DCHECK(self->IsExceptionPending()); 2859 // We need to accept erroneous classes as component types. 2860 component_type.Assign(LookupClass(descriptor + 1, class_loader.Get())); 2861 if (component_type.Get() == nullptr) { 2862 DCHECK(self->IsExceptionPending()); 2863 return nullptr; 2864 } else { 2865 self->ClearException(); 2866 } 2867 } 2868 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2869 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2870 return nullptr; 2871 } 2872 // See if the component type is already loaded. Array classes are 2873 // always associated with the class loader of their underlying 2874 // element type -- an array of Strings goes with the loader for 2875 // java/lang/String -- so we need to look for it there. (The 2876 // caller should have checked for the existence of the class 2877 // before calling here, but they did so with *their* class loader, 2878 // not the component type's loader.) 2879 // 2880 // If we find it, the caller adds "loader" to the class' initiating 2881 // loader list, which should prevent us from going through this again. 2882 // 2883 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2884 // are the same, because our caller (FindClass) just did the 2885 // lookup. (Even if we get this wrong we still have correct behavior, 2886 // because we effectively do this lookup again when we add the new 2887 // class to the hash table --- necessary because of possible races with 2888 // other threads.) 2889 if (class_loader.Get() != component_type->GetClassLoader()) { 2890 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2891 if (new_class != NULL) { 2892 return new_class; 2893 } 2894 } 2895 2896 // Fill out the fields in the Class. 2897 // 2898 // It is possible to execute some methods against arrays, because 2899 // all arrays are subclasses of java_lang_Object_, so we need to set 2900 // up a vtable. We can just point at the one in java_lang_Object_. 2901 // 2902 // Array classes are simple enough that we don't need to do a full 2903 // link step. 2904 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2905 if (UNLIKELY(!init_done_)) { 2906 // Classes that were hand created, ie not by FindSystemClass 2907 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2908 new_class.Assign(GetClassRoot(kClassArrayClass)); 2909 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2910 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2911 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2912 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2913 } else if (strcmp(descriptor, 2914 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2915 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2916 } else if (strcmp(descriptor, 2917 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2918 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2919 } else if (strcmp(descriptor, "[C") == 0) { 2920 new_class.Assign(GetClassRoot(kCharArrayClass)); 2921 } else if (strcmp(descriptor, "[I") == 0) { 2922 new_class.Assign(GetClassRoot(kIntArrayClass)); 2923 } 2924 } 2925 if (new_class.Get() == nullptr) { 2926 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 2927 if (new_class.Get() == nullptr) { 2928 return nullptr; 2929 } 2930 new_class->SetComponentType(component_type.Get()); 2931 } 2932 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2933 DCHECK(new_class->GetComponentType() != NULL); 2934 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2935 new_class->SetSuperClass(java_lang_Object); 2936 new_class->SetVTable(java_lang_Object->GetVTable()); 2937 new_class->SetPrimitiveType(Primitive::kPrimNot); 2938 new_class->SetClassLoader(component_type->GetClassLoader()); 2939 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 2940 new_class->PopulateEmbeddedImtAndVTable(); 2941 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2942 // don't need to set new_class->SetObjectSize(..) 2943 // because Object::SizeOf delegates to Array::SizeOf 2944 2945 2946 // All arrays have java/lang/Cloneable and java/io/Serializable as 2947 // interfaces. We need to set that up here, so that stuff like 2948 // "instanceof" works right. 2949 // 2950 // Note: The GC could run during the call to FindSystemClass, 2951 // so we need to make sure the class object is GC-valid while we're in 2952 // there. Do this by clearing the interface list so the GC will just 2953 // think that the entries are null. 2954 2955 2956 // Use the single, global copies of "interfaces" and "iftable" 2957 // (remember not to free them for arrays). 2958 { 2959 mirror::IfTable* array_iftable = array_iftable_.Read(); 2960 CHECK(array_iftable != nullptr); 2961 new_class->SetIfTable(array_iftable); 2962 } 2963 2964 // Inherit access flags from the component type. 2965 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2966 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2967 access_flags &= kAccJavaFlagsMask; 2968 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2969 // and remove "interface". 2970 access_flags |= kAccAbstract | kAccFinal; 2971 access_flags &= ~kAccInterface; 2972 2973 new_class->SetAccessFlags(access_flags); 2974 2975 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2976 if (existing == nullptr) { 2977 return new_class.Get(); 2978 } 2979 // Another thread must have loaded the class after we 2980 // started but before we finished. Abandon what we've 2981 // done. 2982 // 2983 // (Yes, this happens.) 2984 2985 return existing; 2986} 2987 2988mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2989 switch (type) { 2990 case 'B': 2991 return GetClassRoot(kPrimitiveByte); 2992 case 'C': 2993 return GetClassRoot(kPrimitiveChar); 2994 case 'D': 2995 return GetClassRoot(kPrimitiveDouble); 2996 case 'F': 2997 return GetClassRoot(kPrimitiveFloat); 2998 case 'I': 2999 return GetClassRoot(kPrimitiveInt); 3000 case 'J': 3001 return GetClassRoot(kPrimitiveLong); 3002 case 'S': 3003 return GetClassRoot(kPrimitiveShort); 3004 case 'Z': 3005 return GetClassRoot(kPrimitiveBoolean); 3006 case 'V': 3007 return GetClassRoot(kPrimitiveVoid); 3008 default: 3009 break; 3010 } 3011 std::string printable_type(PrintableChar(type)); 3012 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 3013 return NULL; 3014} 3015 3016mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 3017 size_t hash) { 3018 if (VLOG_IS_ON(class_linker)) { 3019 mirror::DexCache* dex_cache = klass->GetDexCache(); 3020 std::string source; 3021 if (dex_cache != NULL) { 3022 source += " from "; 3023 source += dex_cache->GetLocation()->ToModifiedUtf8(); 3024 } 3025 LOG(INFO) << "Loaded class " << descriptor << source; 3026 } 3027 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3028 mirror::Class* existing = 3029 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3030 if (existing != NULL) { 3031 return existing; 3032 } 3033 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == NULL && 3034 dex_cache_image_class_lookup_required_) { 3035 // Check a class loaded with the system class loader matches one in the image if the class 3036 // is in the image. 3037 existing = LookupClassFromImage(descriptor); 3038 if (existing != NULL) { 3039 CHECK(klass == existing); 3040 } 3041 } 3042 VerifyObject(klass); 3043 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3044 if (log_new_class_table_roots_) { 3045 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3046 } 3047 return NULL; 3048} 3049 3050mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 3051 size_t hash) { 3052 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3053 mirror::Class* existing = 3054 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 3055 3056 if (existing == nullptr) { 3057 CHECK(klass->IsProxyClass()); 3058 return nullptr; 3059 } 3060 3061 CHECK_NE(existing, klass) << descriptor; 3062 CHECK(!existing->IsResolved()) << descriptor; 3063 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 3064 3065 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 3066 ++it) { 3067 mirror::Class* klass = it->second.Read(); 3068 if (klass == existing) { 3069 class_table_.erase(it); 3070 break; 3071 } 3072 } 3073 3074 CHECK(!klass->IsTemp()) << descriptor; 3075 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3076 dex_cache_image_class_lookup_required_) { 3077 // Check a class loaded with the system class loader matches one in the image if the class 3078 // is in the image. 3079 existing = LookupClassFromImage(descriptor); 3080 if (existing != nullptr) { 3081 CHECK(klass == existing) << descriptor; 3082 } 3083 } 3084 VerifyObject(klass); 3085 3086 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3087 if (log_new_class_table_roots_) { 3088 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3089 } 3090 3091 return existing; 3092} 3093 3094bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 3095 size_t hash = Hash(descriptor); 3096 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3097 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3098 it != end && it->first == hash; 3099 ++it) { 3100 mirror::Class* klass = it->second.Read(); 3101 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3102 class_table_.erase(it); 3103 return true; 3104 } 3105 } 3106 return false; 3107} 3108 3109mirror::Class* ClassLinker::LookupClass(const char* descriptor, 3110 const mirror::ClassLoader* class_loader) { 3111 size_t hash = Hash(descriptor); 3112 { 3113 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3114 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3115 if (result != NULL) { 3116 return result; 3117 } 3118 } 3119 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 3120 return NULL; 3121 } else { 3122 // Lookup failed but need to search dex_caches_. 3123 mirror::Class* result = LookupClassFromImage(descriptor); 3124 if (result != NULL) { 3125 InsertClass(descriptor, result, hash); 3126 } else { 3127 // Searching the image dex files/caches failed, we don't want to get into this situation 3128 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3129 // classes into the class table. 3130 constexpr uint32_t kMaxFailedDexCacheLookups = 1000; 3131 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3132 MoveImageClassesToClassTable(); 3133 } 3134 } 3135 return result; 3136 } 3137} 3138 3139mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3140 const mirror::ClassLoader* class_loader, 3141 size_t hash) { 3142 auto end = class_table_.end(); 3143 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3144 mirror::Class* klass = it->second.Read(); 3145 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3146 if (kIsDebugBuild) { 3147 // Check for duplicates in the table. 3148 for (++it; it != end && it->first == hash; ++it) { 3149 mirror::Class* klass2 = it->second.Read(); 3150 CHECK(!(klass2->GetClassLoader() == class_loader && 3151 klass2->DescriptorEquals(descriptor))) 3152 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3153 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3154 } 3155 } 3156 return klass; 3157 } 3158 } 3159 return NULL; 3160} 3161 3162static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3163 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3164 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3165 CHECK(image != NULL); 3166 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3167 return root->AsObjectArray<mirror::DexCache>(); 3168} 3169 3170void ClassLinker::MoveImageClassesToClassTable() { 3171 Thread* self = Thread::Current(); 3172 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3173 if (!dex_cache_image_class_lookup_required_) { 3174 return; // All dex cache classes are already in the class table. 3175 } 3176 const char* old_no_suspend_cause = 3177 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 3178 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3179 std::string temp; 3180 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3181 mirror::DexCache* dex_cache = dex_caches->Get(i); 3182 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3183 for (int32_t j = 0; j < types->GetLength(); j++) { 3184 mirror::Class* klass = types->Get(j); 3185 if (klass != NULL) { 3186 DCHECK(klass->GetClassLoader() == NULL); 3187 const char* descriptor = klass->GetDescriptor(&temp); 3188 size_t hash = Hash(descriptor); 3189 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 3190 if (existing != NULL) { 3191 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3192 << PrettyClassAndClassLoader(klass); 3193 } else { 3194 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3195 if (log_new_class_table_roots_) { 3196 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3197 } 3198 } 3199 } 3200 } 3201 } 3202 dex_cache_image_class_lookup_required_ = false; 3203 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3204} 3205 3206mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3207 Thread* self = Thread::Current(); 3208 const char* old_no_suspend_cause = 3209 self->StartAssertNoThreadSuspension("Image class lookup"); 3210 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3211 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3212 mirror::DexCache* dex_cache = dex_caches->Get(i); 3213 const DexFile* dex_file = dex_cache->GetDexFile(); 3214 // Try binary searching the string/type index. 3215 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3216 if (string_id != NULL) { 3217 const DexFile::TypeId* type_id = 3218 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3219 if (type_id != NULL) { 3220 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3221 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3222 if (klass != NULL) { 3223 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3224 return klass; 3225 } 3226 } 3227 } 3228 } 3229 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3230 return NULL; 3231} 3232 3233void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3234 result.clear(); 3235 if (dex_cache_image_class_lookup_required_) { 3236 MoveImageClassesToClassTable(); 3237 } 3238 size_t hash = Hash(descriptor); 3239 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3240 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3241 it != end && it->first == hash; ++it) { 3242 mirror::Class* klass = it->second.Read(); 3243 if (klass->DescriptorEquals(descriptor)) { 3244 result.push_back(klass); 3245 } 3246 } 3247} 3248 3249void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 3250 // TODO: assert that the monitor on the Class is held 3251 Thread* self = Thread::Current(); 3252 ObjectLock<mirror::Class> lock(self, klass); 3253 3254 // Don't attempt to re-verify if already sufficiently verified. 3255 if (klass->IsVerified() || 3256 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 3257 return; 3258 } 3259 3260 // The class might already be erroneous, for example at compile time if we attempted to verify 3261 // this class as a parent to another. 3262 if (klass->IsErroneous()) { 3263 ThrowEarlierClassFailure(klass.Get()); 3264 return; 3265 } 3266 3267 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3268 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3269 } else { 3270 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3271 << PrettyClass(klass.Get()); 3272 CHECK(!Runtime::Current()->IsCompiler()); 3273 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3274 } 3275 3276 // Skip verification if disabled. 3277 if (!Runtime::Current()->IsVerificationEnabled()) { 3278 klass->SetStatus(mirror::Class::kStatusVerified, self); 3279 return; 3280 } 3281 3282 // Verify super class. 3283 StackHandleScope<2> hs(self); 3284 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3285 if (super.Get() != NULL) { 3286 // Acquire lock to prevent races on verifying the super class. 3287 ObjectLock<mirror::Class> lock(self, super); 3288 3289 if (!super->IsVerified() && !super->IsErroneous()) { 3290 VerifyClass(super); 3291 } 3292 if (!super->IsCompileTimeVerified()) { 3293 std::string error_msg( 3294 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3295 PrettyDescriptor(klass.Get()).c_str(), 3296 PrettyDescriptor(super.Get()).c_str())); 3297 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3298 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3299 if (cause.Get() != nullptr) { 3300 self->ClearException(); 3301 } 3302 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3303 if (cause.Get() != nullptr) { 3304 self->GetException(nullptr)->SetCause(cause.Get()); 3305 } 3306 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3307 if (Runtime::Current()->IsCompiler()) { 3308 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3309 } 3310 klass->SetStatus(mirror::Class::kStatusError, self); 3311 return; 3312 } 3313 } 3314 3315 // Try to use verification information from the oat file, otherwise do runtime verification. 3316 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3317 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3318 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3319 if (oat_file_class_status == mirror::Class::kStatusError) { 3320 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3321 << PrettyDescriptor(klass.Get()) << " in " 3322 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3323 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3324 PrettyDescriptor(klass.Get()).c_str()); 3325 klass->SetStatus(mirror::Class::kStatusError, self); 3326 return; 3327 } 3328 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3329 std::string error_msg; 3330 if (!preverified) { 3331 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 3332 Runtime::Current()->IsCompiler(), 3333 &error_msg); 3334 } 3335 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3336 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3337 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3338 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3339 << " because: " << error_msg; 3340 } 3341 self->AssertNoPendingException(); 3342 // Make sure all classes referenced by catch blocks are resolved. 3343 ResolveClassExceptionHandlerTypes(dex_file, klass); 3344 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3345 // Even though there were no verifier failures we need to respect whether the super-class 3346 // was verified or requiring runtime reverification. 3347 if (super.Get() == NULL || super->IsVerified()) { 3348 klass->SetStatus(mirror::Class::kStatusVerified, self); 3349 } else { 3350 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3351 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3352 // Pretend a soft failure occured so that we don't consider the class verified below. 3353 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3354 } 3355 } else { 3356 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3357 // Soft failures at compile time should be retried at runtime. Soft 3358 // failures at runtime will be handled by slow paths in the generated 3359 // code. Set status accordingly. 3360 if (Runtime::Current()->IsCompiler()) { 3361 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3362 } else { 3363 klass->SetStatus(mirror::Class::kStatusVerified, self); 3364 } 3365 } 3366 } else { 3367 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3368 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3369 << " because: " << error_msg; 3370 self->AssertNoPendingException(); 3371 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3372 klass->SetStatus(mirror::Class::kStatusError, self); 3373 } 3374 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3375 // Class is verified so we don't need to do any access check on its methods. 3376 // Let the interpreter know it by setting the kAccPreverified flag onto each 3377 // method. 3378 // Note: we're going here during compilation and at runtime. When we set the 3379 // kAccPreverified flag when compiling image classes, the flag is recorded 3380 // in the image and is set when loading the image. 3381 klass->SetPreverifiedFlagOnAllMethods(); 3382 } 3383} 3384 3385bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3386 mirror::Class::Status& oat_file_class_status) { 3387 // If we're compiling, we can only verify the class using the oat file if 3388 // we are not compiling the image or if the class we're verifying is not part of 3389 // the app. In other words, we will only check for preverification of bootclasspath 3390 // classes. 3391 if (Runtime::Current()->IsCompiler()) { 3392 // Are we compiling the bootclasspath? 3393 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3394 return false; 3395 } 3396 // We are compiling an app (not the image). 3397 3398 // Is this an app class? (I.e. not a bootclasspath class) 3399 if (klass->GetClassLoader() != NULL) { 3400 return false; 3401 } 3402 } 3403 3404 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 3405 // Make this work with gtests, which do not set up the image properly. 3406 // TODO: we should clean up gtests to set up the image path properly. 3407 if (Runtime::Current()->IsCompiler() || (oat_file == NULL)) { 3408 return false; 3409 } 3410 3411 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3412 uint dex_location_checksum = dex_file.GetLocationChecksum(); 3413 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 3414 &dex_location_checksum); 3415 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3416 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3417 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3418 if (oat_file_class_status == mirror::Class::kStatusVerified || 3419 oat_file_class_status == mirror::Class::kStatusInitialized) { 3420 return true; 3421 } 3422 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3423 // Compile time verification failed with a soft error. Compile time verification can fail 3424 // because we have incomplete type information. Consider the following: 3425 // class ... { 3426 // Foo x; 3427 // .... () { 3428 // if (...) { 3429 // v1 gets assigned a type of resolved class Foo 3430 // } else { 3431 // v1 gets assigned a type of unresolved class Bar 3432 // } 3433 // iput x = v1 3434 // } } 3435 // when we merge v1 following the if-the-else it results in Conflict 3436 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3437 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3438 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3439 // at compile time). 3440 return false; 3441 } 3442 if (oat_file_class_status == mirror::Class::kStatusError) { 3443 // Compile time verification failed with a hard error. This is caused by invalid instructions 3444 // in the class. These errors are unrecoverable. 3445 return false; 3446 } 3447 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3448 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3449 // not loading the class. 3450 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3451 // isn't a problem and this case shouldn't occur 3452 return false; 3453 } 3454 std::string temp; 3455 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3456 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3457 << klass->GetDescriptor(&temp); 3458 3459 return false; 3460} 3461 3462void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3463 Handle<mirror::Class> klass) { 3464 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3465 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3466 } 3467 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3468 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3469 } 3470} 3471 3472void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3473 mirror::ArtMethod* method) { 3474 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3475 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3476 if (code_item == NULL) { 3477 return; // native or abstract method 3478 } 3479 if (code_item->tries_size_ == 0) { 3480 return; // nothing to process 3481 } 3482 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3483 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3484 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3485 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3486 CatchHandlerIterator iterator(handlers_ptr); 3487 for (; iterator.HasNext(); iterator.Next()) { 3488 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3489 // unresolved exception types will be ignored by exception delivery 3490 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3491 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3492 if (exception_type == NULL) { 3493 DCHECK(Thread::Current()->IsExceptionPending()); 3494 Thread::Current()->ClearException(); 3495 } 3496 } 3497 } 3498 handlers_ptr = iterator.EndDataPointer(); 3499 } 3500} 3501 3502static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3503static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3504 Handle<mirror::ArtMethod> prototype); 3505 3506mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3507 jobjectArray interfaces, jobject loader, 3508 jobjectArray methods, jobjectArray throws) { 3509 Thread* self = soa.Self(); 3510 StackHandleScope<8> hs(self); 3511 Handle<mirror::Class> klass(hs.NewHandle( 3512 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3513 if (klass.Get() == NULL) { 3514 CHECK(self->IsExceptionPending()); // OOME. 3515 return NULL; 3516 } 3517 DCHECK(klass->GetClass() != NULL); 3518 klass->SetObjectSize(sizeof(mirror::Proxy)); 3519 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 3520 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3521 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3522 klass->SetName(soa.Decode<mirror::String*>(name)); 3523 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3524 klass->SetDexCache(proxy_class->GetDexCache()); 3525 klass->SetStatus(mirror::Class::kStatusIdx, self); 3526 3527 // Instance fields are inherited, but we add a couple of static fields... 3528 { 3529 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3530 if (UNLIKELY(sfields == NULL)) { 3531 CHECK(self->IsExceptionPending()); // OOME. 3532 return NULL; 3533 } 3534 klass->SetSFields(sfields); 3535 } 3536 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3537 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3538 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3539 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3540 CHECK(self->IsExceptionPending()); // OOME. 3541 return nullptr; 3542 } 3543 klass->SetStaticField(0, interfaces_sfield.Get()); 3544 interfaces_sfield->SetDexFieldIndex(0); 3545 interfaces_sfield->SetDeclaringClass(klass.Get()); 3546 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3547 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3548 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3549 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3550 CHECK(self->IsExceptionPending()); // OOME. 3551 return nullptr; 3552 } 3553 klass->SetStaticField(1, throws_sfield.Get()); 3554 throws_sfield->SetDexFieldIndex(1); 3555 throws_sfield->SetDeclaringClass(klass.Get()); 3556 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3557 3558 // Proxies have 1 direct method, the constructor 3559 { 3560 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3561 if (UNLIKELY(directs == nullptr)) { 3562 CHECK(self->IsExceptionPending()); // OOME. 3563 return nullptr; 3564 } 3565 klass->SetDirectMethods(directs); 3566 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3567 if (UNLIKELY(constructor == nullptr)) { 3568 CHECK(self->IsExceptionPending()); // OOME. 3569 return nullptr; 3570 } 3571 klass->SetDirectMethod(0, constructor); 3572 } 3573 3574 // Create virtual method using specified prototypes. 3575 size_t num_virtual_methods = 3576 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3577 { 3578 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3579 num_virtual_methods); 3580 if (UNLIKELY(virtuals == NULL)) { 3581 CHECK(self->IsExceptionPending()); // OOME. 3582 return NULL; 3583 } 3584 klass->SetVirtualMethods(virtuals); 3585 } 3586 for (size_t i = 0; i < num_virtual_methods; ++i) { 3587 StackHandleScope<1> hs(self); 3588 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3589 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3590 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3591 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3592 if (UNLIKELY(clone == nullptr)) { 3593 CHECK(self->IsExceptionPending()); // OOME. 3594 return nullptr; 3595 } 3596 klass->SetVirtualMethod(i, clone); 3597 } 3598 3599 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3600 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3601 self->AssertNoPendingException(); 3602 3603 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3604 mirror::Class* new_class = nullptr; 3605 { 3606 ObjectLock<mirror::Class> resolution_lock(self, klass); // Must hold lock on object when resolved. 3607 // Link the fields and virtual methods, creating vtable and iftables 3608 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3609 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3610 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3611 klass->SetStatus(mirror::Class::kStatusError, self); 3612 return nullptr; 3613 } 3614 } 3615 3616 CHECK(klass->IsRetired()); 3617 CHECK_NE(klass.Get(), new_class); 3618 klass.Assign(new_class); 3619 3620 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3621 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3622 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3623 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3624 3625 { 3626 // Lock on klass is released. Lock new class object. 3627 ObjectLock<mirror::Class> initialization_lock(self, klass); 3628 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3629 } 3630 3631 // sanity checks 3632 if (kIsDebugBuild) { 3633 CHECK(klass->GetIFields() == nullptr); 3634 CheckProxyConstructor(klass->GetDirectMethod(0)); 3635 for (size_t i = 0; i < num_virtual_methods; ++i) { 3636 StackHandleScope<2> hs(self); 3637 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3638 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3639 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3640 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3641 CheckProxyMethod(virtual_method, prototype); 3642 } 3643 3644 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3645 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3646 decoded_name->ToModifiedUtf8().c_str())); 3647 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3648 3649 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3650 decoded_name->ToModifiedUtf8().c_str())); 3651 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3652 3653 CHECK_EQ(klass.Get()->GetInterfaces(), 3654 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3655 CHECK_EQ(klass.Get()->GetThrows(), 3656 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3657 } 3658 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3659 CHECK(existing == nullptr); 3660 return klass.Get(); 3661} 3662 3663std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3664 DCHECK(proxy_class->IsProxyClass()); 3665 mirror::String* name = proxy_class->GetName(); 3666 DCHECK(name != NULL); 3667 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3668} 3669 3670mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3671 mirror::ArtMethod* proxy_method) { 3672 DCHECK(proxy_class->IsProxyClass()); 3673 DCHECK(proxy_method->IsProxyMethod()); 3674 // Locate the dex cache of the original interface/Object 3675 mirror::DexCache* dex_cache = nullptr; 3676 { 3677 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3678 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3679 mirror::DexCache* a_dex_cache = GetDexCache(i); 3680 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3681 dex_cache = a_dex_cache; 3682 break; 3683 } 3684 } 3685 } 3686 CHECK(dex_cache != nullptr); 3687 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3688 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3689 CHECK(resolved_method != nullptr); 3690 return resolved_method; 3691} 3692 3693 3694mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3695 Handle<mirror::Class> klass, 3696 mirror::Class* proxy_class) { 3697 // Create constructor for Proxy that must initialize h 3698 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3699 proxy_class->GetDirectMethods(); 3700 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3701 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3702 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden 3703 // constructor method. 3704 proxy_class->GetDexCache()->SetResolvedMethod(proxy_constructor->GetDexMethodIndex(), 3705 proxy_constructor); 3706 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3707 // code_ too) 3708 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3709 if (constructor == nullptr) { 3710 CHECK(self->IsExceptionPending()); // OOME. 3711 return nullptr; 3712 } 3713 // Make this constructor public and fix the class to be our Proxy version 3714 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3715 constructor->SetDeclaringClass(klass.Get()); 3716 return constructor; 3717} 3718 3719static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3720 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3721 CHECK(constructor->IsConstructor()); 3722 CHECK_STREQ(constructor->GetName(), "<init>"); 3723 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3724 "(Ljava/lang/reflect/InvocationHandler;)V"); 3725 DCHECK(constructor->IsPublic()); 3726} 3727 3728mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3729 Handle<mirror::Class> klass, 3730 Handle<mirror::ArtMethod> prototype) { 3731 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3732 // prototype method 3733 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3734 prototype.Get()); 3735 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3736 // as necessary 3737 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3738 if (UNLIKELY(method == NULL)) { 3739 CHECK(self->IsExceptionPending()); // OOME. 3740 return NULL; 3741 } 3742 3743 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3744 // the intersection of throw exceptions as defined in Proxy 3745 method->SetDeclaringClass(klass.Get()); 3746 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3747 3748 // At runtime the method looks like a reference and argument saving method, clone the code 3749 // related parameters from this method. 3750 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3751 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3752 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3753 3754 return method; 3755} 3756 3757static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3758 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3759 // Basic sanity 3760 CHECK(!prototype->IsFinal()); 3761 CHECK(method->IsFinal()); 3762 CHECK(!method->IsAbstract()); 3763 3764 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3765 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3766 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3767 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 3768 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 3769 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3770 3771 MethodHelper mh(method); 3772 MethodHelper mh2(prototype); 3773 CHECK_STREQ(method->GetName(), prototype->GetName()); 3774 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3775 // More complex sanity - via dex cache 3776 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3777} 3778 3779static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3780 bool can_init_parents) 3781 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3782 if (can_init_statics && can_init_parents) { 3783 return true; 3784 } 3785 if (!can_init_statics) { 3786 // Check if there's a class initializer. 3787 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3788 if (clinit != NULL) { 3789 return false; 3790 } 3791 // Check if there are encoded static values needing initialization. 3792 if (klass->NumStaticFields() != 0) { 3793 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3794 DCHECK(dex_class_def != NULL); 3795 if (dex_class_def->static_values_off_ != 0) { 3796 return false; 3797 } 3798 } 3799 } 3800 if (!klass->IsInterface() && klass->HasSuperClass()) { 3801 mirror::Class* super_class = klass->GetSuperClass(); 3802 if (!can_init_parents && !super_class->IsInitialized()) { 3803 return false; 3804 } else { 3805 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3806 return false; 3807 } 3808 } 3809 } 3810 return true; 3811} 3812 3813bool ClassLinker::IsInitialized() const { 3814 return init_done_; 3815} 3816 3817bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3818 bool can_init_parents) { 3819 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3820 3821 // Are we already initialized and therefore done? 3822 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3823 // an initialized class will never change its state. 3824 if (klass->IsInitialized()) { 3825 return true; 3826 } 3827 3828 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3829 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3830 return false; 3831 } 3832 3833 Thread* self = Thread::Current(); 3834 uint64_t t0; 3835 { 3836 ObjectLock<mirror::Class> lock(self, klass); 3837 3838 // Re-check under the lock in case another thread initialized ahead of us. 3839 if (klass->IsInitialized()) { 3840 return true; 3841 } 3842 3843 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3844 if (klass->IsErroneous()) { 3845 ThrowEarlierClassFailure(klass.Get()); 3846 return false; 3847 } 3848 3849 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3850 3851 if (!klass->IsVerified()) { 3852 VerifyClass(klass); 3853 if (!klass->IsVerified()) { 3854 // We failed to verify, expect either the klass to be erroneous or verification failed at 3855 // compile time. 3856 if (klass->IsErroneous()) { 3857 CHECK(self->IsExceptionPending()); 3858 } else { 3859 CHECK(Runtime::Current()->IsCompiler()); 3860 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3861 } 3862 return false; 3863 } else { 3864 self->AssertNoPendingException(); 3865 } 3866 } 3867 3868 // If the class is kStatusInitializing, either this thread is 3869 // initializing higher up the stack or another thread has beat us 3870 // to initializing and we need to wait. Either way, this 3871 // invocation of InitializeClass will not be responsible for 3872 // running <clinit> and will return. 3873 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3874 // Could have got an exception during verification. 3875 if (self->IsExceptionPending()) { 3876 return false; 3877 } 3878 // We caught somebody else in the act; was it us? 3879 if (klass->GetClinitThreadId() == self->GetTid()) { 3880 // Yes. That's fine. Return so we can continue initializing. 3881 return true; 3882 } 3883 // No. That's fine. Wait for another thread to finish initializing. 3884 return WaitForInitializeClass(klass, self, lock); 3885 } 3886 3887 if (!ValidateSuperClassDescriptors(klass)) { 3888 klass->SetStatus(mirror::Class::kStatusError, self); 3889 return false; 3890 } 3891 3892 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3893 3894 // From here out other threads may observe that we're initializing and so changes of state 3895 // require the a notification. 3896 klass->SetClinitThreadId(self->GetTid()); 3897 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3898 3899 t0 = NanoTime(); 3900 } 3901 3902 // Initialize super classes, must be done while initializing for the JLS. 3903 if (!klass->IsInterface() && klass->HasSuperClass()) { 3904 mirror::Class* super_class = klass->GetSuperClass(); 3905 if (!super_class->IsInitialized()) { 3906 CHECK(!super_class->IsInterface()); 3907 CHECK(can_init_parents); 3908 StackHandleScope<1> hs(self); 3909 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3910 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3911 if (!super_initialized) { 3912 // The super class was verified ahead of entering initializing, we should only be here if 3913 // the super class became erroneous due to initialization. 3914 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3915 << "Super class initialization failed for " 3916 << PrettyDescriptor(handle_scope_super.Get()) 3917 << " that has unexpected status " << handle_scope_super->GetStatus() 3918 << "\nPending exception:\n" 3919 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3920 ObjectLock<mirror::Class> lock(self, klass); 3921 // Initialization failed because the super-class is erroneous. 3922 klass->SetStatus(mirror::Class::kStatusError, self); 3923 return false; 3924 } 3925 } 3926 } 3927 3928 if (klass->NumStaticFields() > 0) { 3929 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3930 CHECK(dex_class_def != NULL); 3931 const DexFile& dex_file = klass->GetDexFile(); 3932 StackHandleScope<2> hs(self); 3933 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3934 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3935 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3936 this, *dex_class_def); 3937 if (it.HasNext()) { 3938 CHECK(can_init_statics); 3939 // We reordered the fields, so we need to be able to map the 3940 // field indexes to the right fields. 3941 SafeMap<uint32_t, mirror::ArtField*> field_map; 3942 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3943 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3944 if (Runtime::Current()->IsActiveTransaction()) { 3945 it.ReadValueToField<true>(field_map.Get(i)); 3946 } else { 3947 it.ReadValueToField<false>(field_map.Get(i)); 3948 } 3949 } 3950 } 3951 } 3952 3953 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3954 if (clinit != NULL) { 3955 CHECK(can_init_statics); 3956 JValue result; 3957 clinit->Invoke(self, NULL, 0, &result, "V"); 3958 } 3959 3960 uint64_t t1 = NanoTime(); 3961 3962 bool success = true; 3963 { 3964 ObjectLock<mirror::Class> lock(self, klass); 3965 3966 if (self->IsExceptionPending()) { 3967 WrapExceptionInInitializer(); 3968 klass->SetStatus(mirror::Class::kStatusError, self); 3969 success = false; 3970 } else { 3971 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3972 RuntimeStats* thread_stats = self->GetStats(); 3973 ++global_stats->class_init_count; 3974 ++thread_stats->class_init_count; 3975 global_stats->class_init_time_ns += (t1 - t0); 3976 thread_stats->class_init_time_ns += (t1 - t0); 3977 // Set the class as initialized except if failed to initialize static fields. 3978 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3979 if (VLOG_IS_ON(class_linker)) { 3980 std::string temp; 3981 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 3982 klass->GetLocation(); 3983 } 3984 // Opportunistically set static method trampolines to their destination. 3985 FixupStaticTrampolines(klass.Get()); 3986 } 3987 } 3988 return success; 3989} 3990 3991bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3992 ObjectLock<mirror::Class>& lock) 3993 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3994 while (true) { 3995 self->AssertNoPendingException(); 3996 CHECK(!klass->IsInitialized()); 3997 lock.WaitIgnoringInterrupts(); 3998 3999 // When we wake up, repeat the test for init-in-progress. If 4000 // there's an exception pending (only possible if 4001 // "interruptShouldThrow" was set), bail out. 4002 if (self->IsExceptionPending()) { 4003 WrapExceptionInInitializer(); 4004 klass->SetStatus(mirror::Class::kStatusError, self); 4005 return false; 4006 } 4007 // Spurious wakeup? Go back to waiting. 4008 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 4009 continue; 4010 } 4011 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 4012 // Compile time initialization failed. 4013 return false; 4014 } 4015 if (klass->IsErroneous()) { 4016 // The caller wants an exception, but it was thrown in a 4017 // different thread. Synthesize one here. 4018 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 4019 PrettyDescriptor(klass.Get()).c_str()); 4020 return false; 4021 } 4022 if (klass->IsInitialized()) { 4023 return true; 4024 } 4025 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 4026 << klass->GetStatus(); 4027 } 4028 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 4029} 4030 4031bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 4032 if (klass->IsInterface()) { 4033 return true; 4034 } 4035 // Begin with the methods local to the superclass. 4036 StackHandleScope<2> hs(Thread::Current()); 4037 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4038 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4039 if (klass->HasSuperClass() && 4040 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 4041 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 4042 mh.ChangeMethod(klass->GetVTableEntry(i)); 4043 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 4044 if (mh.GetMethod() != super_mh.GetMethod() && 4045 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4046 ThrowLinkageError(klass.Get(), 4047 "Class %s method %s resolves differently in superclass %s", 4048 PrettyDescriptor(klass.Get()).c_str(), 4049 PrettyMethod(mh.GetMethod()).c_str(), 4050 PrettyDescriptor(klass->GetSuperClass()).c_str()); 4051 return false; 4052 } 4053 } 4054 } 4055 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 4056 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 4057 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 4058 for (uint32_t j = 0; j < num_methods; ++j) { 4059 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 4060 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 4061 if (mh.GetMethod() != super_mh.GetMethod() && 4062 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 4063 ThrowLinkageError(klass.Get(), 4064 "Class %s method %s resolves differently in interface %s", 4065 PrettyDescriptor(klass.Get()).c_str(), 4066 PrettyMethod(mh.GetMethod()).c_str(), 4067 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 4068 return false; 4069 } 4070 } 4071 } 4072 } 4073 return true; 4074} 4075 4076bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 4077 bool can_init_parents) { 4078 DCHECK(c.Get() != nullptr); 4079 if (c->IsInitialized()) { 4080 return true; 4081 } 4082 const bool success = InitializeClass(c, can_init_fields, can_init_parents); 4083 Thread* self = Thread::Current(); 4084 if (!success) { 4085 if (can_init_fields && can_init_parents) { 4086 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get()); 4087 } 4088 } else { 4089 self->AssertNoPendingException(); 4090 } 4091 return success; 4092} 4093 4094void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 4095 mirror::Class* c, 4096 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 4097 const byte* class_data = dex_file.GetClassData(dex_class_def); 4098 ClassDataItemIterator it(dex_file, class_data); 4099 StackHandleScope<2> hs(Thread::Current()); 4100 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 4101 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 4102 CHECK(!kMovingFields); 4103 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 4104 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 4105 } 4106} 4107 4108void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4109 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4110 if (fields != nullptr) { 4111 for (int index = 0; index < fields->GetLength(); index ++) { 4112 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4113 fields->Get(index)->SetDeclaringClass(new_class); 4114 } 4115 } 4116 } 4117 4118 fields = new_class->GetSFields(); 4119 if (fields != nullptr) { 4120 for (int index = 0; index < fields->GetLength(); index ++) { 4121 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4122 fields->Get(index)->SetDeclaringClass(new_class); 4123 } 4124 } 4125 } 4126 4127 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4128 if (methods != nullptr) { 4129 for (int index = 0; index < methods->GetLength(); index ++) { 4130 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4131 methods->Get(index)->SetDeclaringClass(new_class); 4132 } 4133 } 4134 } 4135 4136 methods = new_class->GetVirtualMethods(); 4137 if (methods != nullptr) { 4138 for (int index = 0; index < methods->GetLength(); index ++) { 4139 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4140 methods->Get(index)->SetDeclaringClass(new_class); 4141 } 4142 } 4143 } 4144} 4145 4146bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4147 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4148 mirror::Class** new_class) { 4149 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4150 4151 if (!LinkSuperClass(klass)) { 4152 return false; 4153 } 4154 if (!LinkMethods(self, klass, interfaces)) { 4155 return false; 4156 } 4157 if (!LinkInstanceFields(klass)) { 4158 return false; 4159 } 4160 size_t class_size; 4161 if (!LinkStaticFields(klass, &class_size)) { 4162 return false; 4163 } 4164 CreateReferenceInstanceOffsets(klass); 4165 CreateReferenceStaticOffsets(klass); 4166 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4167 4168 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4169 // We don't need to retire this class as it has no embedded tables or it was created the 4170 // correct size during class linker initialization. 4171 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4172 4173 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4174 klass->PopulateEmbeddedImtAndVTable(); 4175 } 4176 4177 // This will notify waiters on klass that saw the not yet resolved 4178 // class in the class_table_ during EnsureResolved. 4179 klass->SetStatus(mirror::Class::kStatusResolved, self); 4180 *new_class = klass.Get(); 4181 } else { 4182 CHECK(!klass->IsResolved()); 4183 // Retire the temporary class and create the correctly sized resolved class. 4184 *new_class = klass->CopyOf(self, class_size); 4185 if (UNLIKELY(*new_class == NULL)) { 4186 CHECK(self->IsExceptionPending()); // Expect an OOME. 4187 klass->SetStatus(mirror::Class::kStatusError, self); 4188 return false; 4189 } 4190 4191 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4192 StackHandleScope<1> hs(self); 4193 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4194 ObjectLock<mirror::Class> lock(self, new_class_h); 4195 4196 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4197 4198 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4199 CHECK(existing == NULL || existing == klass.Get()); 4200 4201 // This will notify waiters on temp class that saw the not yet resolved class in the 4202 // class_table_ during EnsureResolved. 4203 klass->SetStatus(mirror::Class::kStatusRetired, self); 4204 4205 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4206 // This will notify waiters on new_class that saw the not yet resolved 4207 // class in the class_table_ during EnsureResolved. 4208 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4209 } 4210 return true; 4211} 4212 4213bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4214 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4215 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4216 uint16_t super_class_idx = class_def.superclass_idx_; 4217 if (super_class_idx != DexFile::kDexNoIndex16) { 4218 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4219 if (super_class == NULL) { 4220 DCHECK(Thread::Current()->IsExceptionPending()); 4221 return false; 4222 } 4223 // Verify 4224 if (!klass->CanAccess(super_class)) { 4225 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4226 PrettyDescriptor(super_class).c_str(), 4227 PrettyDescriptor(klass.Get()).c_str()); 4228 return false; 4229 } 4230 CHECK(super_class->IsResolved()); 4231 klass->SetSuperClass(super_class); 4232 } 4233 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4234 if (interfaces != NULL) { 4235 for (size_t i = 0; i < interfaces->Size(); i++) { 4236 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4237 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4238 if (interface == NULL) { 4239 DCHECK(Thread::Current()->IsExceptionPending()); 4240 return false; 4241 } 4242 // Verify 4243 if (!klass->CanAccess(interface)) { 4244 // TODO: the RI seemed to ignore this in my testing. 4245 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4246 PrettyDescriptor(interface).c_str(), 4247 PrettyDescriptor(klass.Get()).c_str()); 4248 return false; 4249 } 4250 } 4251 } 4252 // Mark the class as loaded. 4253 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 4254 return true; 4255} 4256 4257bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4258 CHECK(!klass->IsPrimitive()); 4259 mirror::Class* super = klass->GetSuperClass(); 4260 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4261 if (super != NULL) { 4262 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4263 return false; 4264 } 4265 return true; 4266 } 4267 if (super == NULL) { 4268 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4269 PrettyDescriptor(klass.Get()).c_str()); 4270 return false; 4271 } 4272 // Verify 4273 if (super->IsFinal() || super->IsInterface()) { 4274 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4275 PrettyDescriptor(super).c_str(), 4276 PrettyDescriptor(klass.Get()).c_str(), 4277 super->IsFinal() ? "declared final" : "an interface"); 4278 return false; 4279 } 4280 if (!klass->CanAccess(super)) { 4281 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4282 PrettyDescriptor(super).c_str(), 4283 PrettyDescriptor(klass.Get()).c_str()); 4284 return false; 4285 } 4286 4287 // Inherit kAccClassIsFinalizable from the superclass in case this 4288 // class doesn't override finalize. 4289 if (super->IsFinalizable()) { 4290 klass->SetFinalizable(); 4291 } 4292 4293 // Inherit reference flags (if any) from the superclass. 4294 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4295 if (reference_flags != 0) { 4296 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4297 } 4298 // Disallow custom direct subclasses of java.lang.ref.Reference. 4299 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4300 ThrowLinkageError(klass.Get(), 4301 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4302 PrettyDescriptor(klass.Get()).c_str()); 4303 return false; 4304 } 4305 4306 if (kIsDebugBuild) { 4307 // Ensure super classes are fully resolved prior to resolving fields.. 4308 while (super != NULL) { 4309 CHECK(super->IsResolved()); 4310 super = super->GetSuperClass(); 4311 } 4312 } 4313 return true; 4314} 4315 4316// Populate the class vtable and itable. Compute return type indices. 4317bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4318 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4319 if (klass->IsInterface()) { 4320 // No vtable. 4321 size_t count = klass->NumVirtualMethods(); 4322 if (!IsUint(16, count)) { 4323 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4324 return false; 4325 } 4326 for (size_t i = 0; i < count; ++i) { 4327 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4328 } 4329 // Link interface method tables 4330 return LinkInterfaceMethods(klass, interfaces); 4331 } else { 4332 // Link virtual and interface method tables 4333 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4334 } 4335 return true; 4336} 4337 4338bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4339 if (klass->HasSuperClass()) { 4340 uint32_t max_count = klass->NumVirtualMethods() + 4341 klass->GetSuperClass()->GetVTableLength(); 4342 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4343 CHECK_LE(actual_count, max_count); 4344 StackHandleScope<4> hs(self); 4345 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4346 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4347 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4348 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4349 if (UNLIKELY(vtable.Get() == nullptr)) { 4350 CHECK(self->IsExceptionPending()); // OOME. 4351 return false; 4352 } 4353 int len = super_class->GetVTableLength(); 4354 for (int i = 0; i < len; i++) { 4355 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4356 } 4357 } else { 4358 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4359 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4360 if (UNLIKELY(vtable.Get() == nullptr)) { 4361 CHECK(self->IsExceptionPending()); // OOME. 4362 return false; 4363 } 4364 } 4365 4366 // See if any of our virtual methods override the superclass. 4367 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4368 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4369 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4370 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4371 local_mh.ChangeMethod(local_method); 4372 size_t j = 0; 4373 for (; j < actual_count; ++j) { 4374 mirror::ArtMethod* super_method = vtable->Get(j); 4375 super_mh.ChangeMethod(super_method); 4376 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4377 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4378 super_method->GetAccessFlags())) { 4379 if (super_method->IsFinal()) { 4380 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4381 PrettyMethod(local_method).c_str(), 4382 super_method->GetDeclaringClassDescriptor()); 4383 return false; 4384 } 4385 vtable->Set<false>(j, local_method); 4386 local_method->SetMethodIndex(j); 4387 break; 4388 } else { 4389 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4390 << " would have incorrectly overridden the package-private method in " 4391 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4392 } 4393 } 4394 } 4395 if (j == actual_count) { 4396 // Not overriding, append. 4397 vtable->Set<false>(actual_count, local_method); 4398 local_method->SetMethodIndex(actual_count); 4399 actual_count += 1; 4400 } 4401 } 4402 if (!IsUint(16, actual_count)) { 4403 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4404 return false; 4405 } 4406 // Shrink vtable if possible 4407 CHECK_LE(actual_count, max_count); 4408 if (actual_count < max_count) { 4409 vtable.Assign(vtable->CopyOf(self, actual_count)); 4410 if (UNLIKELY(vtable.Get() == NULL)) { 4411 CHECK(self->IsExceptionPending()); // OOME. 4412 return false; 4413 } 4414 } 4415 klass->SetVTable(vtable.Get()); 4416 } else { 4417 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4418 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4419 if (!IsUint(16, num_virtual_methods)) { 4420 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4421 return false; 4422 } 4423 StackHandleScope<1> hs(self); 4424 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4425 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4426 if (UNLIKELY(vtable.Get() == NULL)) { 4427 CHECK(self->IsExceptionPending()); // OOME. 4428 return false; 4429 } 4430 for (size_t i = 0; i < num_virtual_methods; ++i) { 4431 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4432 vtable->Set<false>(i, virtual_method); 4433 virtual_method->SetMethodIndex(i & 0xFFFF); 4434 } 4435 klass->SetVTable(vtable.Get()); 4436 } 4437 return true; 4438} 4439 4440bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 4441 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4442 Thread* const self = Thread::Current(); 4443 Runtime* const runtime = Runtime::Current(); 4444 // Set the imt table to be all conflicts by default. 4445 klass->SetImTable(runtime->GetDefaultImt()); 4446 size_t super_ifcount; 4447 if (klass->HasSuperClass()) { 4448 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4449 } else { 4450 super_ifcount = 0; 4451 } 4452 uint32_t num_interfaces = 4453 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4454 size_t ifcount = super_ifcount + num_interfaces; 4455 for (size_t i = 0; i < num_interfaces; i++) { 4456 mirror::Class* interface = 4457 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4458 interfaces->Get(i); 4459 ifcount += interface->GetIfTableCount(); 4460 } 4461 if (ifcount == 0) { 4462 // Class implements no interfaces. 4463 DCHECK_EQ(klass->GetIfTableCount(), 0); 4464 DCHECK(klass->GetIfTable() == NULL); 4465 return true; 4466 } 4467 if (ifcount == super_ifcount) { 4468 // Class implements same interfaces as parent, are any of these not marker interfaces? 4469 bool has_non_marker_interface = false; 4470 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4471 for (size_t i = 0; i < ifcount; ++i) { 4472 if (super_iftable->GetMethodArrayCount(i) > 0) { 4473 has_non_marker_interface = true; 4474 break; 4475 } 4476 } 4477 if (!has_non_marker_interface) { 4478 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4479 klass->SetIfTable(super_iftable); 4480 return true; 4481 } 4482 } 4483 StackHandleScope<4> hs(self); 4484 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4485 if (UNLIKELY(iftable.Get() == NULL)) { 4486 CHECK(self->IsExceptionPending()); // OOME. 4487 return false; 4488 } 4489 if (super_ifcount != 0) { 4490 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4491 for (size_t i = 0; i < super_ifcount; i++) { 4492 mirror::Class* super_interface = super_iftable->GetInterface(i); 4493 iftable->SetInterface(i, super_interface); 4494 } 4495 } 4496 // Flatten the interface inheritance hierarchy. 4497 size_t idx = super_ifcount; 4498 for (size_t i = 0; i < num_interfaces; i++) { 4499 mirror::Class* interface = 4500 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4501 interfaces->Get(i); 4502 DCHECK(interface != NULL); 4503 if (!interface->IsInterface()) { 4504 std::string temp; 4505 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4506 PrettyDescriptor(klass.Get()).c_str(), 4507 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4508 return false; 4509 } 4510 // Check if interface is already in iftable 4511 bool duplicate = false; 4512 for (size_t j = 0; j < idx; j++) { 4513 mirror::Class* existing_interface = iftable->GetInterface(j); 4514 if (existing_interface == interface) { 4515 duplicate = true; 4516 break; 4517 } 4518 } 4519 if (!duplicate) { 4520 // Add this non-duplicate interface. 4521 iftable->SetInterface(idx++, interface); 4522 // Add this interface's non-duplicate super-interfaces. 4523 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4524 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4525 bool super_duplicate = false; 4526 for (size_t k = 0; k < idx; k++) { 4527 mirror::Class* existing_interface = iftable->GetInterface(k); 4528 if (existing_interface == super_interface) { 4529 super_duplicate = true; 4530 break; 4531 } 4532 } 4533 if (!super_duplicate) { 4534 iftable->SetInterface(idx++, super_interface); 4535 } 4536 } 4537 } 4538 } 4539 // Shrink iftable in case duplicates were found 4540 if (idx < ifcount) { 4541 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4542 if (UNLIKELY(iftable.Get() == NULL)) { 4543 CHECK(self->IsExceptionPending()); // OOME. 4544 return false; 4545 } 4546 ifcount = idx; 4547 } else { 4548 CHECK_EQ(idx, ifcount); 4549 } 4550 klass->SetIfTable(iftable.Get()); 4551 4552 // If we're an interface, we don't need the vtable pointers, so we're done. 4553 if (klass->IsInterface()) { 4554 return true; 4555 } 4556 // Allocate imtable 4557 bool imtable_changed = false; 4558 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4559 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4560 if (UNLIKELY(imtable.Get() == NULL)) { 4561 CHECK(self->IsExceptionPending()); // OOME. 4562 return false; 4563 } 4564 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4565 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4566 std::vector<mirror::ArtMethod*> miranda_list; 4567 for (size_t i = 0; i < ifcount; ++i) { 4568 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4569 if (num_methods > 0) { 4570 StackHandleScope<2> hs(self); 4571 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4572 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4573 if (UNLIKELY(method_array.Get() == nullptr)) { 4574 CHECK(self->IsExceptionPending()); // OOME. 4575 return false; 4576 } 4577 iftable->SetMethodArray(i, method_array.Get()); 4578 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4579 hs.NewHandle(klass->GetVTableDuringLinking())); 4580 for (size_t j = 0; j < num_methods; ++j) { 4581 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 4582 interface_mh.ChangeMethod(interface_method); 4583 int32_t k; 4584 // For each method listed in the interface's method list, find the 4585 // matching method in our class's method list. We want to favor the 4586 // subclass over the superclass, which just requires walking 4587 // back from the end of the vtable. (This only matters if the 4588 // superclass defines a private method and this class redefines 4589 // it -- otherwise it would use the same vtable slot. In .dex files 4590 // those don't end up in the virtual method table, so it shouldn't 4591 // matter which direction we go. We walk it backward anyway.) 4592 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4593 mirror::ArtMethod* vtable_method = vtable->Get(k); 4594 vtable_mh.ChangeMethod(vtable_method); 4595 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4596 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 4597 ThrowIllegalAccessError( 4598 klass.Get(), 4599 "Method '%s' implementing interface method '%s' is not public", 4600 PrettyMethod(vtable_method).c_str(), 4601 PrettyMethod(interface_method).c_str()); 4602 return false; 4603 } 4604 method_array->Set<false>(j, vtable_method); 4605 // Place method in imt if entry is empty, place conflict otherwise. 4606 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4607 if (imtable->Get(imt_index) == NULL) { 4608 imtable->Set<false>(imt_index, vtable_method); 4609 imtable_changed = true; 4610 } else { 4611 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4612 } 4613 break; 4614 } 4615 } 4616 if (k < 0) { 4617 StackHandleScope<1> hs(self); 4618 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4619 for (mirror::ArtMethod* mir_method : miranda_list) { 4620 vtable_mh.ChangeMethod(mir_method); 4621 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4622 miranda_method.Assign(mir_method); 4623 break; 4624 } 4625 } 4626 if (miranda_method.Get() == NULL) { 4627 // Point the interface table at a phantom slot. 4628 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 4629 if (UNLIKELY(miranda_method.Get() == NULL)) { 4630 CHECK(self->IsExceptionPending()); // OOME. 4631 return false; 4632 } 4633 // TODO: If a methods move then the miranda_list may hold stale references. 4634 miranda_list.push_back(miranda_method.Get()); 4635 } 4636 method_array->Set<false>(j, miranda_method.Get()); 4637 } 4638 } 4639 } 4640 } 4641 if (imtable_changed) { 4642 // Fill in empty entries in interface method table with conflict. 4643 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4644 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4645 if (imtable->Get(i) == NULL) { 4646 imtable->Set<false>(i, imt_conflict_method); 4647 } 4648 } 4649 klass->SetImTable(imtable.Get()); 4650 } 4651 if (!miranda_list.empty()) { 4652 int old_method_count = klass->NumVirtualMethods(); 4653 int new_method_count = old_method_count + miranda_list.size(); 4654 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4655 if (old_method_count == 0) { 4656 virtuals = AllocArtMethodArray(self, new_method_count); 4657 } else { 4658 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4659 } 4660 if (UNLIKELY(virtuals == NULL)) { 4661 CHECK(self->IsExceptionPending()); // OOME. 4662 return false; 4663 } 4664 klass->SetVirtualMethods(virtuals); 4665 4666 StackHandleScope<1> hs(self); 4667 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4668 hs.NewHandle(klass->GetVTableDuringLinking())); 4669 CHECK(vtable.Get() != NULL); 4670 int old_vtable_count = vtable->GetLength(); 4671 int new_vtable_count = old_vtable_count + miranda_list.size(); 4672 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4673 if (UNLIKELY(vtable.Get() == NULL)) { 4674 CHECK(self->IsExceptionPending()); // OOME. 4675 return false; 4676 } 4677 for (size_t i = 0; i < miranda_list.size(); ++i) { 4678 mirror::ArtMethod* method = miranda_list[i]; 4679 // Leave the declaring class alone as type indices are relative to it 4680 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4681 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4682 klass->SetVirtualMethod(old_method_count + i, method); 4683 vtable->Set<false>(old_vtable_count + i, method); 4684 } 4685 // TODO: do not assign to the vtable field until it is fully constructed. 4686 klass->SetVTable(vtable.Get()); 4687 } 4688 4689 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4690 for (int i = 0; i < vtable->GetLength(); ++i) { 4691 CHECK(vtable->Get(i) != NULL); 4692 } 4693 4694// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4695 4696 return true; 4697} 4698 4699bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4700 CHECK(klass.Get() != NULL); 4701 return LinkFields(klass, false, nullptr); 4702} 4703 4704bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass, size_t* class_size) { 4705 CHECK(klass.Get() != NULL); 4706 return LinkFields(klass, true, class_size); 4707} 4708 4709struct LinkFieldsComparator { 4710 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4711 } 4712 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4713 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4714 NO_THREAD_SAFETY_ANALYSIS { 4715 // First come reference fields, then 64-bit, and finally 32-bit 4716 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4717 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4718 if (type1 != type2) { 4719 bool is_primitive1 = type1 != Primitive::kPrimNot; 4720 bool is_primitive2 = type2 != Primitive::kPrimNot; 4721 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4722 type1 == Primitive::kPrimDouble); 4723 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4724 type2 == Primitive::kPrimDouble); 4725 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4726 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4727 if (order1 != order2) { 4728 return order1 < order2; 4729 } 4730 } 4731 // same basic group? then sort by string. 4732 return strcmp(field1->GetName(), field2->GetName()) < 0; 4733 } 4734}; 4735 4736bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static, size_t* class_size) { 4737 size_t num_fields = 4738 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4739 4740 mirror::ObjectArray<mirror::ArtField>* fields = 4741 is_static ? klass->GetSFields() : klass->GetIFields(); 4742 4743 // Initialize field_offset 4744 MemberOffset field_offset(0); 4745 if (is_static) { 4746 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 4747 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4748 // Static fields come after the embedded tables. 4749 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 4750 0, 0, 0); 4751 } 4752 field_offset = MemberOffset(base); 4753 } else { 4754 mirror::Class* super_class = klass->GetSuperClass(); 4755 if (super_class != NULL) { 4756 CHECK(super_class->IsResolved()) 4757 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4758 field_offset = MemberOffset(super_class->GetObjectSize()); 4759 } 4760 } 4761 4762 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4763 4764 // we want a relatively stable order so that adding new fields 4765 // minimizes disruption of C++ version such as Class and Method. 4766 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4767 for (size_t i = 0; i < num_fields; i++) { 4768 mirror::ArtField* f = fields->Get(i); 4769 CHECK(f != NULL) << PrettyClass(klass.Get()); 4770 grouped_and_sorted_fields.push_back(f); 4771 } 4772 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4773 LinkFieldsComparator()); 4774 4775 // References should be at the front. 4776 size_t current_field = 0; 4777 size_t num_reference_fields = 0; 4778 for (; current_field < num_fields; current_field++) { 4779 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4780 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4781 bool isPrimitive = type != Primitive::kPrimNot; 4782 if (isPrimitive) { 4783 break; // past last reference, move on to the next phase 4784 } 4785 grouped_and_sorted_fields.pop_front(); 4786 num_reference_fields++; 4787 fields->Set<false>(current_field, field); 4788 field->SetOffset(field_offset); 4789 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4790 } 4791 4792 // Now we want to pack all of the double-wide fields together. If 4793 // we're not aligned, though, we want to shuffle one 32-bit field 4794 // into place. If we can't find one, we'll have to pad it. 4795 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4796 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4797 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4798 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4799 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4800 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4801 continue; 4802 } 4803 fields->Set<false>(current_field++, field); 4804 field->SetOffset(field_offset); 4805 // drop the consumed field 4806 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4807 break; 4808 } 4809 // whether we found a 32-bit field for padding or not, we advance 4810 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4811 } 4812 4813 // Alignment is good, shuffle any double-wide fields forward, and 4814 // finish assigning field offsets to all fields. 4815 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 4816 << PrettyClass(klass.Get()); 4817 while (!grouped_and_sorted_fields.empty()) { 4818 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4819 grouped_and_sorted_fields.pop_front(); 4820 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4821 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4822 fields->Set<false>(current_field, field); 4823 field->SetOffset(field_offset); 4824 field_offset = MemberOffset(field_offset.Uint32Value() + 4825 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4826 ? sizeof(uint64_t) 4827 : sizeof(uint32_t))); 4828 current_field++; 4829 } 4830 4831 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4832 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4833 // We know there are no non-reference fields in the Reference classes, and we know 4834 // that 'referent' is alphabetically last, so this is easy... 4835 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4836 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4837 --num_reference_fields; 4838 } 4839 4840 if (kIsDebugBuild) { 4841 // Make sure that all reference fields appear before 4842 // non-reference fields, and all double-wide fields are aligned. 4843 bool seen_non_ref = false; 4844 for (size_t i = 0; i < num_fields; i++) { 4845 mirror::ArtField* field = fields->Get(i); 4846 if (false) { // enable to debug field layout 4847 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4848 << " class=" << PrettyClass(klass.Get()) 4849 << " field=" << PrettyField(field) 4850 << " offset=" 4851 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4852 } 4853 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4854 bool is_primitive = type != Primitive::kPrimNot; 4855 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4856 strcmp("referent", field->GetName()) == 0) { 4857 is_primitive = true; // We lied above, so we have to expect a lie here. 4858 } 4859 if (is_primitive) { 4860 if (!seen_non_ref) { 4861 seen_non_ref = true; 4862 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4863 } 4864 } else { 4865 DCHECK(!seen_non_ref) << PrettyField(field); 4866 } 4867 } 4868 if (!seen_non_ref) { 4869 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4870 } 4871 } 4872 4873 size_t size = field_offset.Uint32Value(); 4874 // Update klass 4875 if (is_static) { 4876 klass->SetNumReferenceStaticFields(num_reference_fields); 4877 *class_size = size; 4878 } else { 4879 klass->SetNumReferenceInstanceFields(num_reference_fields); 4880 if (!klass->IsVariableSize()) { 4881 std::string temp; 4882 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 4883 size_t previous_size = klass->GetObjectSize(); 4884 if (previous_size != 0) { 4885 // Make sure that we didn't originally have an incorrect size. 4886 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 4887 } 4888 klass->SetObjectSize(size); 4889 } 4890 } 4891 return true; 4892} 4893 4894// Set the bitmap of reference offsets, refOffsets, from the ifields 4895// list. 4896void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4897 uint32_t reference_offsets = 0; 4898 mirror::Class* super_class = klass->GetSuperClass(); 4899 if (super_class != NULL) { 4900 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4901 // If our superclass overflowed, we don't stand a chance. 4902 if (reference_offsets == CLASS_WALK_SUPER) { 4903 klass->SetReferenceInstanceOffsets(reference_offsets); 4904 return; 4905 } 4906 } 4907 CreateReferenceOffsets(klass, false, reference_offsets); 4908} 4909 4910void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4911 CreateReferenceOffsets(klass, true, 0); 4912} 4913 4914void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4915 uint32_t reference_offsets) { 4916 size_t num_reference_fields = 4917 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4918 : klass->NumReferenceInstanceFieldsDuringLinking(); 4919 mirror::ObjectArray<mirror::ArtField>* fields = 4920 is_static ? klass->GetSFields() : klass->GetIFields(); 4921 // All of the fields that contain object references are guaranteed 4922 // to be at the beginning of the fields list. 4923 for (size_t i = 0; i < num_reference_fields; ++i) { 4924 // Note that byte_offset is the offset from the beginning of 4925 // object, not the offset into instance data 4926 mirror::ArtField* field = fields->Get(i); 4927 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4928 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4929 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4930 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4931 CHECK_NE(new_bit, 0U); 4932 reference_offsets |= new_bit; 4933 } else { 4934 reference_offsets = CLASS_WALK_SUPER; 4935 break; 4936 } 4937 } 4938 // Update fields in klass 4939 if (is_static) { 4940 klass->SetReferenceStaticOffsets(reference_offsets); 4941 } else { 4942 klass->SetReferenceInstanceOffsets(reference_offsets); 4943 } 4944} 4945 4946mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4947 Handle<mirror::DexCache> dex_cache) { 4948 DCHECK(dex_cache.Get() != nullptr); 4949 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4950 if (resolved != NULL) { 4951 return resolved; 4952 } 4953 uint32_t utf16_length; 4954 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4955 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4956 dex_cache->SetResolvedString(string_idx, string); 4957 return string; 4958} 4959 4960mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4961 mirror::Class* referrer) { 4962 StackHandleScope<2> hs(Thread::Current()); 4963 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4964 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4965 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4966} 4967 4968mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4969 Handle<mirror::DexCache> dex_cache, 4970 Handle<mirror::ClassLoader> class_loader) { 4971 DCHECK(dex_cache.Get() != NULL); 4972 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4973 if (resolved == NULL) { 4974 Thread* self = Thread::Current(); 4975 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4976 resolved = FindClass(self, descriptor, class_loader); 4977 if (resolved != NULL) { 4978 // TODO: we used to throw here if resolved's class loader was not the 4979 // boot class loader. This was to permit different classes with the 4980 // same name to be loaded simultaneously by different loaders 4981 dex_cache->SetResolvedType(type_idx, resolved); 4982 } else { 4983 CHECK(self->IsExceptionPending()) 4984 << "Expected pending exception for failed resolution of: " << descriptor; 4985 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4986 StackHandleScope<1> hs(self); 4987 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4988 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4989 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4990 self->ClearException(); 4991 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4992 self->GetException(NULL)->SetCause(cause.Get()); 4993 } 4994 } 4995 } 4996 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4997 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4998 return resolved; 4999} 5000 5001mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 5002 Handle<mirror::DexCache> dex_cache, 5003 Handle<mirror::ClassLoader> class_loader, 5004 Handle<mirror::ArtMethod> referrer, 5005 InvokeType type) { 5006 DCHECK(dex_cache.Get() != nullptr); 5007 // Check for hit in the dex cache. 5008 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 5009 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 5010 return resolved; 5011 } 5012 // Fail, get the declaring class. 5013 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5014 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 5015 if (klass == nullptr) { 5016 DCHECK(Thread::Current()->IsExceptionPending()); 5017 return nullptr; 5018 } 5019 // Scan using method_idx, this saves string compares but will only hit for matching dex 5020 // caches/files. 5021 switch (type) { 5022 case kDirect: // Fall-through. 5023 case kStatic: 5024 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 5025 break; 5026 case kInterface: 5027 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 5028 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5029 break; 5030 case kSuper: // Fall-through. 5031 case kVirtual: 5032 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 5033 break; 5034 default: 5035 LOG(FATAL) << "Unreachable - invocation type: " << type; 5036 } 5037 if (resolved == nullptr) { 5038 // Search by name, which works across dex files. 5039 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5040 const Signature signature = dex_file.GetMethodSignature(method_id); 5041 switch (type) { 5042 case kDirect: // Fall-through. 5043 case kStatic: 5044 resolved = klass->FindDirectMethod(name, signature); 5045 break; 5046 case kInterface: 5047 resolved = klass->FindInterfaceMethod(name, signature); 5048 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 5049 break; 5050 case kSuper: // Fall-through. 5051 case kVirtual: 5052 resolved = klass->FindVirtualMethod(name, signature); 5053 break; 5054 } 5055 } 5056 // If we found a method, check for incompatible class changes. 5057 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 5058 // Be a good citizen and update the dex cache to speed subsequent calls. 5059 dex_cache->SetResolvedMethod(method_idx, resolved); 5060 return resolved; 5061 } else { 5062 // If we had a method, it's an incompatible-class-change error. 5063 if (resolved != nullptr) { 5064 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 5065 } else { 5066 // We failed to find the method which means either an access error, an incompatible class 5067 // change, or no such method. First try to find the method among direct and virtual methods. 5068 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 5069 const Signature signature = dex_file.GetMethodSignature(method_id); 5070 switch (type) { 5071 case kDirect: 5072 case kStatic: 5073 resolved = klass->FindVirtualMethod(name, signature); 5074 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 5075 // have had a resolved method before, which triggers the "true" branch above. 5076 break; 5077 case kInterface: 5078 case kVirtual: 5079 case kSuper: 5080 resolved = klass->FindDirectMethod(name, signature); 5081 break; 5082 } 5083 5084 // If we found something, check that it can be accessed by the referrer. 5085 if (resolved != nullptr && referrer.Get() != nullptr) { 5086 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5087 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5088 if (!referring_class->CanAccess(methods_class)) { 5089 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5090 resolved, type); 5091 return nullptr; 5092 } else if (!referring_class->CanAccessMember(methods_class, 5093 resolved->GetAccessFlags())) { 5094 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5095 return nullptr; 5096 } 5097 } 5098 5099 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 5100 // methods and throw if we find the method there. If we find nothing, throw a 5101 // NoSuchMethodError. 5102 switch (type) { 5103 case kDirect: 5104 case kStatic: 5105 if (resolved != nullptr) { 5106 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5107 } else { 5108 resolved = klass->FindInterfaceMethod(name, signature); 5109 if (resolved != nullptr) { 5110 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5111 } else { 5112 ThrowNoSuchMethodError(type, klass, name, signature); 5113 } 5114 } 5115 break; 5116 case kInterface: 5117 if (resolved != nullptr) { 5118 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5119 } else { 5120 resolved = klass->FindVirtualMethod(name, signature); 5121 if (resolved != nullptr) { 5122 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5123 } else { 5124 ThrowNoSuchMethodError(type, klass, name, signature); 5125 } 5126 } 5127 break; 5128 case kSuper: 5129 if (resolved != nullptr) { 5130 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5131 } else { 5132 ThrowNoSuchMethodError(type, klass, name, signature); 5133 } 5134 break; 5135 case kVirtual: 5136 if (resolved != nullptr) { 5137 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5138 } else { 5139 resolved = klass->FindInterfaceMethod(name, signature); 5140 if (resolved != nullptr) { 5141 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5142 } else { 5143 ThrowNoSuchMethodError(type, klass, name, signature); 5144 } 5145 } 5146 break; 5147 } 5148 } 5149 DCHECK(Thread::Current()->IsExceptionPending()); 5150 return nullptr; 5151 } 5152} 5153 5154mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5155 Handle<mirror::DexCache> dex_cache, 5156 Handle<mirror::ClassLoader> class_loader, 5157 bool is_static) { 5158 DCHECK(dex_cache.Get() != nullptr); 5159 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5160 if (resolved != nullptr) { 5161 return resolved; 5162 } 5163 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5164 Thread* const self = Thread::Current(); 5165 StackHandleScope<1> hs(self); 5166 Handle<mirror::Class> klass( 5167 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5168 if (klass.Get() == nullptr) { 5169 DCHECK(Thread::Current()->IsExceptionPending()); 5170 return nullptr; 5171 } 5172 5173 if (is_static) { 5174 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5175 } else { 5176 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5177 } 5178 5179 if (resolved == nullptr) { 5180 const char* name = dex_file.GetFieldName(field_id); 5181 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5182 if (is_static) { 5183 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5184 } else { 5185 resolved = klass->FindInstanceField(name, type); 5186 } 5187 if (resolved == nullptr) { 5188 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5189 return NULL; 5190 } 5191 } 5192 dex_cache->SetResolvedField(field_idx, resolved); 5193 return resolved; 5194} 5195 5196mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5197 uint32_t field_idx, 5198 Handle<mirror::DexCache> dex_cache, 5199 Handle<mirror::ClassLoader> class_loader) { 5200 DCHECK(dex_cache.Get() != nullptr); 5201 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5202 if (resolved != nullptr) { 5203 return resolved; 5204 } 5205 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5206 Thread* self = Thread::Current(); 5207 StackHandleScope<1> hs(self); 5208 Handle<mirror::Class> klass( 5209 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5210 if (klass.Get() == NULL) { 5211 DCHECK(Thread::Current()->IsExceptionPending()); 5212 return NULL; 5213 } 5214 5215 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5216 StringPiece type(dex_file.StringDataByIdx( 5217 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5218 resolved = mirror::Class::FindField(self, klass, name, type); 5219 if (resolved != NULL) { 5220 dex_cache->SetResolvedField(field_idx, resolved); 5221 } else { 5222 ThrowNoSuchFieldError("", klass.Get(), type, name); 5223 } 5224 return resolved; 5225} 5226 5227const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5228 uint32_t* length) { 5229 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5230 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5231 const DexFile& dex_file = *dex_cache->GetDexFile(); 5232 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5233 return dex_file.GetMethodShorty(method_id, length); 5234} 5235 5236void ClassLinker::DumpAllClasses(int flags) { 5237 if (dex_cache_image_class_lookup_required_) { 5238 MoveImageClassesToClassTable(); 5239 } 5240 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5241 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5242 std::vector<mirror::Class*> all_classes; 5243 { 5244 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5245 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5246 mirror::Class* klass = it.second.Read(); 5247 all_classes.push_back(klass); 5248 } 5249 } 5250 5251 for (size_t i = 0; i < all_classes.size(); ++i) { 5252 all_classes[i]->DumpClass(std::cerr, flags); 5253 } 5254} 5255 5256void ClassLinker::DumpForSigQuit(std::ostream& os) { 5257 if (dex_cache_image_class_lookup_required_) { 5258 MoveImageClassesToClassTable(); 5259 } 5260 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5261 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5262} 5263 5264size_t ClassLinker::NumLoadedClasses() { 5265 if (dex_cache_image_class_lookup_required_) { 5266 MoveImageClassesToClassTable(); 5267 } 5268 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5269 return class_table_.size(); 5270} 5271 5272pid_t ClassLinker::GetClassesLockOwner() { 5273 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5274} 5275 5276pid_t ClassLinker::GetDexLockOwner() { 5277 return dex_lock_.GetExclusiveOwnerTid(); 5278} 5279 5280void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5281 DCHECK(!init_done_); 5282 5283 DCHECK(klass != NULL); 5284 DCHECK(klass->GetClassLoader() == NULL); 5285 5286 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5287 DCHECK(class_roots != NULL); 5288 DCHECK(class_roots->Get(class_root) == NULL); 5289 class_roots->Set<false>(class_root, klass); 5290} 5291 5292} // namespace art 5293