class_linker.cc revision 345c4b19758703793ed31024cfb79940e2c63b75
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.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 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor().c_str(), 104 PrettyDescriptor(c).c_str()); 105 } else { 106 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 107 PrettyDescriptor(c).c_str()); 108 } 109} 110 111static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 112 Thread* self = Thread::Current(); 113 JNIEnv* env = self->GetJniEnv(); 114 115 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 116 CHECK(cause.get() != NULL); 117 118 env->ExceptionClear(); 119 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 120 env->Throw(cause.get()); 121 122 // We only wrap non-Error exceptions; an Error can just be used as-is. 123 if (!is_error) { 124 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 125 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 126 } 127} 128 129static size_t Hash(const char* s) { 130 // This is the java.lang.String hashcode for convenience, not interoperability. 131 size_t hash = 0; 132 for (; *s != '\0'; ++s) { 133 hash = hash * 31 + *s; 134 } 135 return hash; 136} 137 138const char* ClassLinker::class_roots_descriptors_[] = { 139 "Ljava/lang/Class;", 140 "Ljava/lang/Object;", 141 "[Ljava/lang/Class;", 142 "[Ljava/lang/Object;", 143 "Ljava/lang/String;", 144 "Ljava/lang/DexCache;", 145 "Ljava/lang/ref/Reference;", 146 "Ljava/lang/reflect/ArtField;", 147 "Ljava/lang/reflect/ArtMethod;", 148 "Ljava/lang/reflect/Proxy;", 149 "[Ljava/lang/String;", 150 "[Ljava/lang/reflect/ArtField;", 151 "[Ljava/lang/reflect/ArtMethod;", 152 "Ljava/lang/ClassLoader;", 153 "Ljava/lang/Throwable;", 154 "Ljava/lang/ClassNotFoundException;", 155 "Ljava/lang/StackTraceElement;", 156 "Z", 157 "B", 158 "C", 159 "D", 160 "F", 161 "I", 162 "J", 163 "S", 164 "V", 165 "[Z", 166 "[B", 167 "[C", 168 "[D", 169 "[F", 170 "[I", 171 "[J", 172 "[S", 173 "[Ljava/lang/StackTraceElement;", 174}; 175 176ClassLinker::ClassLinker(InternTable* intern_table) 177 // dex_lock_ is recursive as it may be used in stack dumping. 178 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 179 dex_cache_image_class_lookup_required_(false), 180 failed_dex_cache_class_lookups_(0), 181 class_roots_(nullptr), 182 array_iftable_(nullptr), 183 find_array_class_cache_next_victim_(0), 184 init_done_(false), 185 log_new_dex_caches_roots_(false), 186 log_new_class_table_roots_(false), 187 intern_table_(intern_table), 188 portable_resolution_trampoline_(nullptr), 189 quick_resolution_trampoline_(nullptr), 190 portable_imt_conflict_trampoline_(nullptr), 191 quick_imt_conflict_trampoline_(nullptr), 192 quick_generic_jni_trampoline_(nullptr), 193 quick_to_interpreter_bridge_trampoline_(nullptr) { 194 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 195 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 196} 197 198// To set a value for generic JNI. May be necessary in compiler tests. 199extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 200 201void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 202 VLOG(startup) << "ClassLinker::Init"; 203 CHECK(Runtime::Current()->IsCompiler()); 204 205 CHECK(!init_done_); 206 207 // java_lang_Class comes first, it's needed for AllocClass 208 Thread* self = Thread::Current(); 209 gc::Heap* heap = Runtime::Current()->GetHeap(); 210 // The GC can't handle an object with a null class since we can't get the size of this object. 211 heap->IncrementDisableMovingGC(self); 212 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 213 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 214 heap->AllocNonMovableObject<true>(self, nullptr, 215 mirror::Class::ClassClassSize(), 216 VoidFunctor())))); 217 CHECK(java_lang_Class.Get() != NULL); 218 mirror::Class::SetClassClass(java_lang_Class.Get()); 219 java_lang_Class->SetClass(java_lang_Class.Get()); 220 if (kUseBakerOrBrooksReadBarrier) { 221 java_lang_Class->AssertReadBarrierPointer(); 222 } 223 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 224 heap->DecrementDisableMovingGC(self); 225 // AllocClass(mirror::Class*) can now be used 226 227 // Class[] is used for reflection support. 228 Handle<mirror::Class> class_array_class(hs.NewHandle( 229 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 230 class_array_class->SetComponentType(java_lang_Class.Get()); 231 232 // java_lang_Object comes next so that object_array_class can be created. 233 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 234 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 235 CHECK(java_lang_Object.Get() != NULL); 236 // backfill Object as the super class of Class. 237 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 238 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 239 240 // Object[] next to hold class roots. 241 Handle<mirror::Class> object_array_class(hs.NewHandle( 242 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 243 object_array_class->SetComponentType(java_lang_Object.Get()); 244 245 // Setup the char (primitive) class to be used for char[]. 246 Handle<mirror::Class> char_class(hs.NewHandle( 247 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 248 249 // Setup the char[] class to be used for String. 250 Handle<mirror::Class> char_array_class(hs.NewHandle( 251 AllocClass(self, java_lang_Class.Get(), 252 mirror::Array::ClassSize()))); 253 char_array_class->SetComponentType(char_class.Get()); 254 mirror::CharArray::SetArrayClass(char_array_class.Get()); 255 256 // Setup String. 257 Handle<mirror::Class> java_lang_String(hs.NewHandle( 258 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 259 mirror::String::SetClass(java_lang_String.Get()); 260 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 261 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 262 263 // Setup Reference. 264 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 265 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 266 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 267 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 268 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 269 270 // Create storage for root classes, save away our work so far (requires descriptors). 271 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 272 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 273 kClassRootsMax)); 274 CHECK(!class_roots_.IsNull()); 275 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 276 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 277 SetClassRoot(kClassArrayClass, class_array_class.Get()); 278 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 279 SetClassRoot(kCharArrayClass, char_array_class.Get()); 280 SetClassRoot(kJavaLangString, java_lang_String.Get()); 281 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 282 283 // Setup the primitive type classes. 284 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 285 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 286 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 287 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 288 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 289 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 290 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 291 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 292 293 // Create array interface entries to populate once we can load system classes. 294 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 295 296 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 297 Handle<mirror::Class> int_array_class(hs.NewHandle( 298 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 299 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 300 mirror::IntArray::SetArrayClass(int_array_class.Get()); 301 SetClassRoot(kIntArrayClass, int_array_class.Get()); 302 303 // now that these are registered, we can use AllocClass() and AllocObjectArray 304 305 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 306 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 307 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 308 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 309 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 310 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 311 312 // Constructor, Field, Method, and AbstractMethod are necessary so 313 // that FindClass can link members. 314 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 315 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 316 CHECK(java_lang_reflect_ArtField.Get() != NULL); 317 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 318 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 319 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 320 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 321 322 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 323 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 324 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 325 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 326 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 327 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 328 329 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 330 331 // Set up array classes for string, field, method 332 Handle<mirror::Class> object_array_string(hs.NewHandle( 333 AllocClass(self, java_lang_Class.Get(), 334 mirror::ObjectArray<mirror::String>::ClassSize()))); 335 object_array_string->SetComponentType(java_lang_String.Get()); 336 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 337 338 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 339 AllocClass(self, java_lang_Class.Get(), 340 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 341 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 342 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 343 344 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 345 AllocClass(self, java_lang_Class.Get(), 346 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 347 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 348 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 349 350 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 351 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 352 // these roots. 353 CHECK_NE(0U, boot_class_path.size()); 354 for (size_t i = 0; i != boot_class_path.size(); ++i) { 355 const DexFile* dex_file = boot_class_path[i]; 356 CHECK(dex_file != NULL); 357 AppendToBootClassPath(*dex_file); 358 } 359 360 // now we can use FindSystemClass 361 362 // run char class through InitializePrimitiveClass to finish init 363 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 364 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 365 366 // Create runtime resolution and imt conflict methods. Also setup the default imt. 367 Runtime* runtime = Runtime::Current(); 368 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 369 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 370 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 371 372 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 373 // we do not need friend classes or a publicly exposed setter. 374 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 375 376 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 377 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 378 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 379 CHECK_EQ(java_lang_Object.Get(), Object_class); 380 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 381 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 382 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 383 std::ostringstream os1, os2; 384 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 385 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 386 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 387 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 388 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 389 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 390 CHECK_EQ(java_lang_String.Get(), String_class); 391 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 392 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 393 394 // Setup the primitive array type classes - can't be done until Object has a vtable. 395 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 396 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 397 398 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 399 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 400 401 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 402 CHECK_EQ(char_array_class.Get(), found_char_array_class); 403 404 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 405 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 406 407 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 408 CHECK_EQ(int_array_class.Get(), found_int_array_class); 409 410 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 411 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 412 413 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 414 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 415 416 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 417 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 418 419 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 420 CHECK_EQ(class_array_class.Get(), found_class_array_class); 421 422 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 423 CHECK_EQ(object_array_class.Get(), found_object_array_class); 424 425 // Setup the single, global copy of "iftable". 426 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 427 CHECK(java_lang_Cloneable != NULL); 428 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 429 CHECK(java_io_Serializable != NULL); 430 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 431 // crawl up and explicitly list all of the supers as well. 432 { 433 mirror::IfTable* array_iftable = array_iftable_.Read(); 434 array_iftable->SetInterface(0, java_lang_Cloneable); 435 array_iftable->SetInterface(1, java_io_Serializable); 436 } 437 438 // Sanity check Class[] and Object[]'s interfaces. 439 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 440 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 441 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 442 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 443 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 444 // dex_cache_ fields and register them in class_table_. 445 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 446 CHECK_EQ(java_lang_Class.Get(), Class_class); 447 448 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 449 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 450 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 451 452 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 453 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 454 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 455 456 mirror::Class* String_array_class = 457 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 458 CHECK_EQ(object_array_string.Get(), String_array_class); 459 460 mirror::Class* Art_method_array_class = 461 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 462 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 463 464 mirror::Class* Art_field_array_class = 465 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 466 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 467 468 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 469 470 // Create java.lang.reflect.Proxy root. 471 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 472 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 473 474 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 475 // finish initializing Reference class 476 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 477 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 478 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 479 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 480 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 481 mirror::Class* java_lang_ref_FinalizerReference = 482 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 483 java_lang_ref_FinalizerReference->SetAccessFlags( 484 java_lang_ref_FinalizerReference->GetAccessFlags() | 485 kAccClassIsReference | kAccClassIsFinalizerReference); 486 mirror::Class* java_lang_ref_PhantomReference = 487 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 488 java_lang_ref_PhantomReference->SetAccessFlags( 489 java_lang_ref_PhantomReference->GetAccessFlags() | 490 kAccClassIsReference | kAccClassIsPhantomReference); 491 mirror::Class* java_lang_ref_SoftReference = 492 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 493 java_lang_ref_SoftReference->SetAccessFlags( 494 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 495 mirror::Class* java_lang_ref_WeakReference = 496 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 497 java_lang_ref_WeakReference->SetAccessFlags( 498 java_lang_ref_WeakReference->GetAccessFlags() | 499 kAccClassIsReference | kAccClassIsWeakReference); 500 501 // Setup the ClassLoader, verifying the object_size_. 502 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 503 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 504 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 505 506 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 507 // java.lang.StackTraceElement as a convenience. 508 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 509 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 510 SetClassRoot(kJavaLangClassNotFoundException, 511 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 512 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 513 SetClassRoot(kJavaLangStackTraceElementArrayClass, 514 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 515 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 516 517 FinishInit(self); 518 519 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 520} 521 522void ClassLinker::FinishInit(Thread* self) { 523 VLOG(startup) << "ClassLinker::FinishInit entering"; 524 525 // Let the heap know some key offsets into java.lang.ref instances 526 // Note: we hard code the field indexes here rather than using FindInstanceField 527 // as the types of the field can't be resolved prior to the runtime being 528 // fully initialized 529 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 530 mirror::Class* java_lang_ref_FinalizerReference = 531 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 532 533 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 534 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 535 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 536 537 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 538 CHECK_STREQ(queue->GetName(), "queue"); 539 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 540 541 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 542 CHECK_STREQ(queueNext->GetName(), "queueNext"); 543 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 544 545 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 546 CHECK_STREQ(referent->GetName(), "referent"); 547 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 548 549 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 550 CHECK_STREQ(zombie->GetName(), "zombie"); 551 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 552 553 // ensure all class_roots_ are initialized 554 for (size_t i = 0; i < kClassRootsMax; i++) { 555 ClassRoot class_root = static_cast<ClassRoot>(i); 556 mirror::Class* klass = GetClassRoot(class_root); 557 CHECK(klass != NULL); 558 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 559 // note SetClassRoot does additional validation. 560 // if possible add new checks there to catch errors early 561 } 562 563 CHECK(!array_iftable_.IsNull()); 564 565 // disable the slow paths in FindClass and CreatePrimitiveClass now 566 // that Object, Class, and Object[] are setup 567 init_done_ = true; 568 569 VLOG(startup) << "ClassLinker::FinishInit exiting"; 570} 571 572void ClassLinker::RunRootClinits() { 573 Thread* self = Thread::Current(); 574 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 575 mirror::Class* c = GetClassRoot(ClassRoot(i)); 576 if (!c->IsArrayClass() && !c->IsPrimitive()) { 577 StackHandleScope<1> hs(self); 578 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 579 EnsureInitialized(h_class, true, true); 580 self->AssertNoPendingException(); 581 } 582 } 583} 584 585bool ClassLinker::GenerateOatFile(const char* dex_filename, 586 int oat_fd, 587 const char* oat_cache_filename, 588 std::string* error_msg) { 589 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 590 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 591 592 gc::Heap* heap = Runtime::Current()->GetHeap(); 593 std::string boot_image_option("--boot-image="); 594 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 595 596 std::string dex_file_option("--dex-file="); 597 dex_file_option += dex_filename; 598 599 std::string oat_fd_option("--oat-fd="); 600 StringAppendF(&oat_fd_option, "%d", oat_fd); 601 602 std::string oat_location_option("--oat-location="); 603 oat_location_option += oat_cache_filename; 604 605 std::vector<std::string> argv; 606 argv.push_back(dex2oat); 607 argv.push_back("--runtime-arg"); 608 argv.push_back("-classpath"); 609 argv.push_back("--runtime-arg"); 610 argv.push_back(Runtime::Current()->GetClassPathString()); 611 612 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 613 614 if (!Runtime::Current()->IsVerificationEnabled()) { 615 argv.push_back("--compiler-filter=verify-none"); 616 } 617 618 if (Runtime::Current()->MustRelocateIfPossible()) { 619 argv.push_back("--runtime-arg"); 620 argv.push_back("-Xrelocate"); 621 } else { 622 argv.push_back("--runtime-arg"); 623 argv.push_back("-Xnorelocate"); 624 } 625 626 if (!kIsTargetBuild) { 627 argv.push_back("--host"); 628 } 629 630 argv.push_back(boot_image_option); 631 argv.push_back(dex_file_option); 632 argv.push_back(oat_fd_option); 633 argv.push_back(oat_location_option); 634 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 635 for (size_t i = 0; i < compiler_options.size(); ++i) { 636 argv.push_back(compiler_options[i].c_str()); 637 } 638 639 return Exec(argv, error_msg); 640} 641 642const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 643 WriterMutexLock mu(Thread::Current(), dex_lock_); 644 if (kIsDebugBuild) { 645 for (size_t i = 0; i < oat_files_.size(); ++i) { 646 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 647 } 648 } 649 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 650 oat_files_.push_back(oat_file); 651 return oat_file; 652} 653 654OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 655 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 656 OatFile* oat_file = space->ReleaseOatFile(); 657 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 658 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 659 return *oat_file; 660} 661 662const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 663 const char* dex_location = dex_file.GetLocation().c_str(); 664 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 665 return FindOpenedOatFile(nullptr, dex_location, &dex_location_checksum); 666} 667 668const OatFile* ClassLinker::FindOpenedOatFile(const char* oat_location, const char* dex_location, 669 const uint32_t* const dex_location_checksum) { 670 ReaderMutexLock mu(Thread::Current(), dex_lock_); 671 for (size_t i = 0; i < oat_files_.size(); i++) { 672 const OatFile* oat_file = oat_files_[i]; 673 DCHECK(oat_file != NULL); 674 675 if (oat_location != nullptr) { 676 if (oat_file->GetLocation() != oat_location) { 677 continue; 678 } 679 } 680 681 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 682 dex_location_checksum, 683 false); 684 if (oat_dex_file != NULL) { 685 return oat_file; 686 } 687 } 688 return NULL; 689} 690 691static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, const char* dex_location, 692 bool generated, 693 std::vector<std::string>* error_msgs, 694 std::vector<const DexFile*>* dex_files) { 695 if (oat_file == nullptr) { 696 return false; 697 } 698 699 size_t old_size = dex_files->size(); // To rollback on error. 700 701 bool success = true; 702 for (size_t i = 0; success; ++i) { 703 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 704 const char* next_name = next_name_str.c_str(); 705 706 uint32_t dex_location_checksum; 707 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 708 std::string error_msg; 709 if (!DexFile::GetChecksum(next_name, dex_location_checksum_pointer, &error_msg)) { 710 DCHECK_EQ(false, i == 0 && generated); 711 dex_location_checksum_pointer = nullptr; 712 } 713 714 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 715 716 if (oat_dex_file == nullptr) { 717 if (i == 0 && generated) { 718 std::string error_msg; 719 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 720 " file'%s'", dex_location, dex_location_checksum, 721 oat_file->GetLocation().c_str()); 722 error_msgs->push_back(error_msg); 723 } 724 break; // Not found, done. 725 } 726 727 // Checksum test. Test must succeed when generated. 728 success = !generated; 729 if (dex_location_checksum_pointer != nullptr) { 730 success = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 731 } 732 733 if (success) { 734 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 735 if (dex_file == nullptr) { 736 success = false; 737 error_msgs->push_back(error_msg); 738 } else { 739 dex_files->push_back(dex_file); 740 } 741 } 742 743 // When we generated the file, we expect success, or something is terribly wrong. 744 CHECK_EQ(false, generated && !success) 745 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 746 << std::hex << " dex_location_checksum=" << dex_location_checksum 747 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 748 } 749 750 if (dex_files->size() == old_size) { 751 success = false; // We did not even find classes.dex 752 } 753 754 if (success) { 755 return true; 756 } else { 757 // Free all the dex files we have loaded. 758 auto it = dex_files->begin() + old_size; 759 auto it_end = dex_files->end(); 760 for (; it != it_end; it++) { 761 delete *it; 762 } 763 dex_files->erase(dex_files->begin() + old_size, it_end); 764 765 return false; 766 } 767} 768 769// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 770// complicates the loading process, as we should not use an iterative loading process, because that 771// would register the oat file and dex files that come before the broken one. Instead, check all 772// multidex ahead of time. 773bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 774 std::vector<std::string>* error_msgs, 775 std::vector<const DexFile*>* dex_files) { 776 // 1) Check whether we have an open oat file. 777 // This requires a dex checksum, use the "primary" one. 778 uint32_t dex_location_checksum; 779 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 780 bool have_checksum = true; 781 std::string checksum_error_msg; 782 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 783 dex_location_checksum_pointer = nullptr; 784 have_checksum = false; 785 } 786 787 bool needs_registering = false; 788 789 std::unique_ptr<const OatFile> open_oat_file(FindOpenedOatFile(oat_location, dex_location, 790 dex_location_checksum_pointer)); 791 792 // 2) If we do not have an open one, maybe there's one on disk already. 793 794 // In case the oat file is not open, we play a locking game here so 795 // that if two different processes race to load and register or generate 796 // (or worse, one tries to open a partial generated file) we will be okay. 797 // This is actually common with apps that use DexClassLoader to work 798 // around the dex method reference limit and that have a background 799 // service running in a separate process. 800 ScopedFlock scoped_flock; 801 802 if (open_oat_file.get() == nullptr) { 803 if (oat_location != nullptr) { 804 // Can only do this if we have a checksum, else error. 805 if (!have_checksum) { 806 error_msgs->push_back(checksum_error_msg); 807 return false; 808 } 809 810 std::string error_msg; 811 812 // We are loading or creating one in the future. Time to set up the file lock. 813 if (!scoped_flock.Init(oat_location, &error_msg)) { 814 error_msgs->push_back(error_msg); 815 return false; 816 } 817 818 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 819 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 820 oat_location, &error_msg)); 821 822 if (open_oat_file.get() == nullptr) { 823 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 824 dex_location, oat_location, error_msg.c_str()); 825 VLOG(class_linker) << compound_msg; 826 error_msgs->push_back(compound_msg); 827 } 828 } else { 829 // TODO: What to lock here? 830 bool obsolete_file_cleanup_failed; 831 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 832 dex_location_checksum_pointer, 833 kRuntimeISA, error_msgs, 834 &obsolete_file_cleanup_failed)); 835 // There's no point in going forward and eventually try to regenerate the 836 // file if we couldn't remove the obsolete one. Mostly likely we will fail 837 // with the same error when trying to write the new file. 838 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 839 if (obsolete_file_cleanup_failed) { 840 return false; 841 } 842 } 843 needs_registering = true; 844 } 845 846 // 3) If we have an oat file, check all contained multidex files for our dex_location. 847 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 848 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, false, error_msgs, 849 dex_files); 850 if (success) { 851 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 852 if (needs_registering) { 853 // We opened the oat file, so we must register it. 854 RegisterOatFile(oat_file); 855 } 856 return true; 857 } else { 858 if (needs_registering) { 859 // We opened it, delete it. 860 open_oat_file.reset(); 861 } else { 862 open_oat_file.release(); // Do not delete open oat files. 863 } 864 } 865 866 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 867 868 // Need a checksum, fail else. 869 if (!have_checksum) { 870 error_msgs->push_back(checksum_error_msg); 871 return false; 872 } 873 874 // Look in cache location if no oat_location is given. 875 std::string cache_location; 876 if (oat_location == nullptr) { 877 // Use the dalvik cache. 878 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 879 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 880 oat_location = cache_location.c_str(); 881 } 882 883 // Definitely need to lock now. 884 if (!scoped_flock.HasFile()) { 885 std::string error_msg; 886 if (!scoped_flock.Init(oat_location, &error_msg)) { 887 error_msgs->push_back(error_msg); 888 return false; 889 } 890 } 891 892 // Create the oat file. 893 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 894 oat_location, error_msgs)); 895 896 // Failed, bail. 897 if (open_oat_file.get() == nullptr) { 898 return false; 899 } 900 901 // Try to load again, but stronger checks. 902 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, true, error_msgs, 903 dex_files); 904 if (success) { 905 RegisterOatFile(open_oat_file.release()); 906 return true; 907 } else { 908 return false; 909 } 910} 911 912const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 913 uint32_t dex_location_checksum, 914 const char* oat_location, 915 std::string* error_msg) { 916 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 917 !Runtime::Current()->IsCompiler(), 918 error_msg)); 919 if (oat_file.get() == nullptr) { 920 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 921 error_msg->c_str()); 922 return nullptr; 923 } 924 Runtime* runtime = Runtime::Current(); 925 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 926 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 927 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 928 if (expected_image_oat_checksum != actual_image_oat_checksum) { 929 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 930 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 931 actual_image_oat_checksum); 932 return nullptr; 933 } 934 935 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 936 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 937 if (expected_image_oat_offset != actual_image_oat_offset) { 938 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 939 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 940 actual_image_oat_offset); 941 return nullptr; 942 } 943 int32_t expected_patch_delta = image_header.GetPatchDelta(); 944 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 945 if (expected_patch_delta != actual_patch_delta) { 946 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 947 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 948 return nullptr; 949 } 950 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 951 &dex_location_checksum); 952 if (oat_dex_file == nullptr) { 953 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 954 dex_location); 955 return nullptr; 956 } 957 uint32_t expected_dex_checksum = dex_location_checksum; 958 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 959 if (expected_dex_checksum != actual_dex_checksum) { 960 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 961 "found 0x%x", oat_location, expected_dex_checksum, 962 actual_dex_checksum); 963 return nullptr; 964 } 965 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 966 if (dex_file.get() != nullptr) { 967 return oat_file.release(); 968 } else { 969 return nullptr; 970 } 971} 972 973const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 974 int fd, const char* oat_location, 975 std::vector<std::string>* error_msgs) { 976 // Generate the output oat file for the dex file 977 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 978 std::string error_msg; 979 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 980 CHECK(!error_msg.empty()); 981 error_msgs->push_back(error_msg); 982 return nullptr; 983 } 984 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 985 !Runtime::Current()->IsCompiler(), 986 &error_msg)); 987 if (oat_file.get() == nullptr) { 988 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 989 oat_location, error_msg.c_str()); 990 error_msgs->push_back(compound_msg); 991 return nullptr; 992 } 993 994 return oat_file.release(); 995} 996 997bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 998 const InstructionSet instruction_set) { 999 Runtime* runtime = Runtime::Current(); 1000 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1001 uint32_t image_oat_checksum = 0; 1002 if (instruction_set == kRuntimeISA) { 1003 const ImageHeader& image_header = image_space->GetImageHeader(); 1004 image_oat_checksum = image_header.GetOatChecksum(); 1005 } else { 1006 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1007 image_space->GetImageLocation().c_str(), instruction_set)); 1008 image_oat_checksum = image_header->GetOatChecksum(); 1009 } 1010 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1011} 1012 1013bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1014 const InstructionSet instruction_set, 1015 std::string* error_msg) { 1016 Runtime* runtime = Runtime::Current(); 1017 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1018 1019 // If the requested instruction set is the same as the current runtime, 1020 // we can use the checksums directly. If it isn't, we'll have to read the 1021 // image header from the image for the right instruction set. 1022 uint32_t image_oat_checksum = 0; 1023 uintptr_t image_oat_data_begin = 0; 1024 int32_t image_patch_delta = 0; 1025 if (instruction_set == Runtime::Current()->GetInstructionSet()) { 1026 const ImageHeader& image_header = image_space->GetImageHeader(); 1027 image_oat_checksum = image_header.GetOatChecksum(); 1028 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1029 image_patch_delta = image_header.GetPatchDelta(); 1030 } else { 1031 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1032 image_space->GetImageLocation().c_str(), instruction_set)); 1033 image_oat_checksum = image_header->GetOatChecksum(); 1034 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1035 image_patch_delta = image_header->GetPatchDelta(); 1036 } 1037 const OatHeader& oat_header = oat_file->GetOatHeader(); 1038 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1039 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1040 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1041 if (!ret) { 1042 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1043 oat_file->GetLocation().c_str(), 1044 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1045 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1046 oat_file->GetOatHeader().GetImagePatchDelta(), 1047 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1048 } 1049 return ret; 1050} 1051 1052bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1053 const char* dex_location, 1054 uint32_t dex_location_checksum, 1055 const InstructionSet instruction_set, 1056 std::string* error_msg) { 1057 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1058 return false; 1059 } 1060 1061 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1062 &dex_location_checksum); 1063 if (oat_dex_file == NULL) { 1064 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1065 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1066 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 1067 for (size_t i = 0; i < oat_dex_files.size(); i++) { 1068 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 1069 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 1070 oat_file->GetLocation().c_str(), 1071 oat_dex_file->GetDexFileLocation().c_str()); 1072 } 1073 return false; 1074 } 1075 1076 if (dex_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) { 1077 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1078 oat_file->GetLocation().c_str(), 1079 oat_dex_file->GetDexFileLocationChecksum(), 1080 dex_location, dex_location_checksum); 1081 return false; 1082 } 1083 return true; 1084} 1085 1086bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1087 const char* dex_location, 1088 std::string* error_msg) { 1089 CHECK(oat_file != nullptr); 1090 CHECK(dex_location != nullptr); 1091 std::unique_ptr<const DexFile> dex_file; 1092 uint32_t dex_location_checksum; 1093 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 1094 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1095 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1096 // directory. 1097 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1098 if (oat_dex_file == nullptr) { 1099 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1100 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1101 error_msg->c_str()); 1102 return false; 1103 } 1104 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1105 } else { 1106 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, dex_location_checksum, 1107 kRuntimeISA, error_msg); 1108 if (!verified) { 1109 return false; 1110 } 1111 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1112 &dex_location_checksum)->OpenDexFile(error_msg)); 1113 } 1114 return dex_file.get() != nullptr; 1115} 1116 1117const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1118 const char* dex_location, 1119 const uint32_t* const dex_location_checksum, 1120 InstructionSet isa, 1121 std::vector<std::string>* error_msgs, 1122 bool* obsolete_file_cleanup_failed) { 1123 *obsolete_file_cleanup_failed = false; 1124 bool already_opened = false; 1125 std::string dex_location_str(dex_location); 1126 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1127 &already_opened, 1128 obsolete_file_cleanup_failed, 1129 error_msgs)); 1130 std::string error_msg; 1131 if (oat_file.get() == nullptr) { 1132 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1133 dex_location)); 1134 return nullptr; 1135 } else if (!VerifyOatWithDexFile(oat_file.get(), dex_location, &error_msg)) { 1136 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1137 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1138 error_msg.c_str())); 1139 return nullptr; 1140 } else { 1141 return oat_file.release(); 1142 } 1143} 1144 1145const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1146 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1147 for (size_t i = 0; i < oat_files_.size(); i++) { 1148 const OatFile* oat_file = oat_files_[i]; 1149 DCHECK(oat_file != nullptr); 1150 if (oat_file->GetLocation() == oat_location) { 1151 return oat_file; 1152 } 1153 } 1154 return nullptr; 1155} 1156 1157const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1158 InstructionSet isa, 1159 bool *already_opened, 1160 bool *obsolete_file_cleanup_failed, 1161 std::vector<std::string>* error_msgs) { 1162 // Find out if we've already opened the file 1163 const OatFile* ret = nullptr; 1164 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1165 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1166 if (ret != nullptr) { 1167 *already_opened = true; 1168 return ret; 1169 } 1170 1171 std::string dalvik_cache; 1172 bool have_android_data = false; 1173 bool have_dalvik_cache = false; 1174 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1175 &have_android_data, &have_dalvik_cache); 1176 std::string cache_filename; 1177 if (have_dalvik_cache) { 1178 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1179 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1180 if (ret != nullptr) { 1181 *already_opened = true; 1182 return ret; 1183 } 1184 } else { 1185 // If we need to relocate we should just place odex back where it started. 1186 cache_filename = odex_filename; 1187 } 1188 1189 ret = nullptr; 1190 1191 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1192 // 1193 // Now we do the following: 1194 // 1) Try and open the odex version 1195 // 2) If present, checksum-verified & relocated correctly return it 1196 // 3) Close the odex version to free up its address space. 1197 // 4) Try and open the cache version 1198 // 5) If present, checksum-verified & relocated correctly return it 1199 // 6) Close the cache version to free up its address space. 1200 // 7) If we should relocate: 1201 // a) If we have opened and checksum-verified the odex version relocate it to 1202 // 'cache_filename' and return it 1203 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1204 // it. This should not happen often (I think only the run-test's will hit this case). 1205 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1206 // this point. 1207 // 9) Return nullptr 1208 1209 *already_opened = false; 1210 const Runtime* runtime = Runtime::Current(); 1211 CHECK(runtime != nullptr); 1212 bool executable = !runtime->IsCompiler(); 1213 1214 std::string odex_error_msg; 1215 bool should_patch_system = false; 1216 bool odex_checksum_verified = false; 1217 { 1218 // There is a high probability that these both these oat files map similar/the same address 1219 // spaces so we must scope them like this so they each gets its turn. 1220 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, NULL, 1221 executable, &odex_error_msg)); 1222 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1223 &odex_checksum_verified, 1224 &odex_error_msg)) { 1225 error_msgs->push_back(odex_error_msg); 1226 return odex_oat_file.release(); 1227 } else if (odex_checksum_verified) { 1228 // We can just relocate 1229 should_patch_system = true; 1230 odex_error_msg = "Image Patches are incorrect"; 1231 } 1232 } 1233 1234 1235 std::string cache_error_msg; 1236 bool should_patch_cache = false; 1237 bool cache_checksum_verified = false; 1238 if (have_dalvik_cache) { 1239 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, NULL, 1240 executable, &cache_error_msg)); 1241 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1242 &cache_checksum_verified, 1243 &cache_error_msg)) { 1244 error_msgs->push_back(cache_error_msg); 1245 return cache_oat_file.release(); 1246 } else if (cache_checksum_verified) { 1247 // We can just relocate 1248 should_patch_cache = true; 1249 cache_error_msg = "Image Patches are incorrect"; 1250 } 1251 } else if (have_android_data) { 1252 // dalvik_cache does not exist but android data does. This means we should be able to create 1253 // it, so we should try. 1254 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1255 } 1256 1257 ret = nullptr; 1258 std::string error_msg; 1259 if (runtime->CanRelocate()) { 1260 // Run relocation 1261 const std::string& image_location = 1262 Runtime::Current()->GetHeap()->GetImageSpace()->GetImageLocation(); 1263 if (odex_checksum_verified && should_patch_system) { 1264 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1265 } else if (cache_checksum_verified && should_patch_cache) { 1266 CHECK(have_dalvik_cache); 1267 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1268 } 1269 } 1270 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1271 // implicitly: were able to fine where the cached version is but we were unable to use it, 1272 // either as a destination for relocation or to open a file. We should delete it if it is 1273 // there. 1274 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1275 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1276 "searching for dex file %s: %s", 1277 cache_filename.c_str(), dex_location.c_str(), 1278 strerror(errno)); 1279 error_msgs->push_back(rm_error_msg); 1280 VLOG(class_linker) << rm_error_msg; 1281 // Let the caller know that we couldn't remove the obsolete file. 1282 // This is a good indication that further writes may fail as well. 1283 *obsolete_file_cleanup_failed = true; 1284 } 1285 } 1286 if (ret == nullptr) { 1287 VLOG(class_linker) << error_msg; 1288 error_msgs->push_back(error_msg); 1289 std::string relocation_msg; 1290 if (runtime->CanRelocate()) { 1291 relocation_msg = StringPrintf(" and relocation failed"); 1292 } 1293 if (have_dalvik_cache && cache_checksum_verified) { 1294 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1295 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1296 cache_filename.c_str(), cache_error_msg.c_str(), 1297 relocation_msg.c_str()); 1298 } else { 1299 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1300 "dalvik_cache availible)%s.", odex_filename.c_str(), 1301 odex_error_msg.c_str(), relocation_msg.c_str()); 1302 } 1303 VLOG(class_linker) << error_msg; 1304 error_msgs->push_back(error_msg); 1305 } 1306 return ret; 1307} 1308 1309const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1310 const std::string& output_oat, 1311 const std::string& image_location, 1312 InstructionSet isa, 1313 std::string* error_msg) { 1314 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1315 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1316 1317 std::string isa_arg("--instruction-set="); 1318 isa_arg += GetInstructionSetString(isa); 1319 std::string input_oat_filename_arg("--input-oat-file="); 1320 input_oat_filename_arg += input_oat; 1321 std::string output_oat_filename_arg("--output-oat-file="); 1322 output_oat_filename_arg += output_oat; 1323 std::string patched_image_arg("--patched-image-location="); 1324 patched_image_arg += image_location; 1325 1326 std::vector<std::string> argv; 1327 argv.push_back(patchoat); 1328 argv.push_back(isa_arg); 1329 argv.push_back(input_oat_filename_arg); 1330 argv.push_back(output_oat_filename_arg); 1331 argv.push_back(patched_image_arg); 1332 1333 std::string command_line(Join(argv, ' ')); 1334 LOG(INFO) << "Relocate Oat File: " << command_line; 1335 bool success = Exec(argv, error_msg); 1336 if (success) { 1337 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, NULL, 1338 !Runtime::Current()->IsCompiler(), error_msg)); 1339 bool checksum_verified = false; 1340 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1341 return output.release(); 1342 } else if (output.get() != nullptr) { 1343 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1344 "but output file '%s' failed verifcation: %s", 1345 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1346 } else { 1347 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1348 "but was unable to open output file '%s': %s", 1349 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1350 } 1351 } else { 1352 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1353 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1354 error_msg->c_str()); 1355 } 1356 return nullptr; 1357} 1358 1359int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1360 Runtime* runtime = Runtime::Current(); 1361 int32_t real_patch_delta; 1362 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1363 if (isa == Runtime::Current()->GetInstructionSet()) { 1364 const ImageHeader& image_header = image_space->GetImageHeader(); 1365 real_patch_delta = image_header.GetPatchDelta(); 1366 } else { 1367 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1368 image_space->GetImageLocation().c_str(), isa)); 1369 real_patch_delta = image_header->GetPatchDelta(); 1370 } 1371 const OatHeader& oat_header = oat_file->GetOatHeader(); 1372 return real_patch_delta - oat_header.GetImagePatchDelta(); 1373} 1374 1375bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1376 bool* checksum_verified, 1377 std::string* error_msg) { 1378 std::string compound_msg("Oat file failed to verify: "); 1379 Runtime* runtime = Runtime::Current(); 1380 uint32_t real_image_checksum; 1381 void* real_image_oat_offset; 1382 int32_t real_patch_delta; 1383 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1384 if (isa == Runtime::Current()->GetInstructionSet()) { 1385 const ImageHeader& image_header = image_space->GetImageHeader(); 1386 real_image_checksum = image_header.GetOatChecksum(); 1387 real_image_oat_offset = image_header.GetOatDataBegin(); 1388 real_patch_delta = image_header.GetPatchDelta(); 1389 } else { 1390 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1391 image_space->GetImageLocation().c_str(), isa)); 1392 real_image_checksum = image_header->GetOatChecksum(); 1393 real_image_oat_offset = image_header->GetOatDataBegin(); 1394 real_patch_delta = image_header->GetPatchDelta(); 1395 } 1396 1397 const OatHeader& oat_header = oat_file->GetOatHeader(); 1398 1399 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1400 *checksum_verified = oat_image_checksum == real_image_checksum; 1401 if (!*checksum_verified) { 1402 compound_msg += StringPrintf(" Oat Image Checksum Incorrect (expected 0x%x, recieved 0x%x)", 1403 real_image_checksum, oat_image_checksum); 1404 } 1405 1406 void* oat_image_oat_offset = 1407 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1408 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1409 if (!offset_verified) { 1410 compound_msg += StringPrintf(" Oat Image oat offset incorrect (expected 0x%p, recieved 0x%p)", 1411 real_image_oat_offset, oat_image_oat_offset); 1412 } 1413 1414 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1415 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1416 if (!patch_delta_verified) { 1417 compound_msg += StringPrintf(" Oat image patch delta incorrect (expected 0x%x, recieved 0x%x)", 1418 real_patch_delta, oat_patch_delta); 1419 } 1420 1421 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1422 if (ret) { 1423 *error_msg = compound_msg; 1424 } 1425 return ret; 1426} 1427 1428const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1429 std::string* error_msg) { 1430 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1431 if (oat_file != nullptr) { 1432 return oat_file; 1433 } 1434 1435 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1436 error_msg); 1437 if (oat_file == NULL) { 1438 return NULL; 1439 } 1440 return oat_file; 1441} 1442 1443static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1444 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1445 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1446 1447 DCHECK(obj != NULL); 1448 DCHECK(class_linker != NULL); 1449 1450 if (obj->IsArtMethod()) { 1451 mirror::ArtMethod* method = obj->AsArtMethod(); 1452 if (!method->IsNative()) { 1453 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1454 if (method != Runtime::Current()->GetResolutionMethod()) { 1455 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1456 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1457 } 1458 } 1459 } 1460} 1461 1462void ClassLinker::InitFromImage() { 1463 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1464 CHECK(!init_done_); 1465 1466 Thread* self = Thread::Current(); 1467 gc::Heap* heap = Runtime::Current()->GetHeap(); 1468 gc::space::ImageSpace* space = heap->GetImageSpace(); 1469 dex_cache_image_class_lookup_required_ = true; 1470 CHECK(space != NULL); 1471 OatFile& oat_file = GetImageOatFile(space); 1472 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1473 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1474 const char* image_file_location = oat_file.GetOatHeader(). 1475 GetStoreValueByKey(OatHeader::kImageLocationKey); 1476 CHECK(image_file_location == nullptr || *image_file_location == 0); 1477 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1478 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1479 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1480 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1481 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1482 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1483 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1484 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1485 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1486 1487 StackHandleScope<1> hs(self); 1488 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1489 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1490 AsObjectArray<mirror::Class>())); 1491 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1492 1493 // Special case of setting up the String class early so that we can test arbitrary objects 1494 // as being Strings or not 1495 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1496 1497 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1498 static_cast<uint32_t>(dex_caches->GetLength())); 1499 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1500 StackHandleScope<1> hs(self); 1501 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1502 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1503 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1504 nullptr); 1505 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1506 std::string error_msg; 1507 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1508 if (dex_file == NULL) { 1509 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1510 << " from within oat file " << oat_file.GetLocation() 1511 << " error '" << error_msg << "'"; 1512 } 1513 1514 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1515 1516 AppendToBootClassPath(*dex_file, dex_cache); 1517 } 1518 1519 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1520 // bitmap walk. 1521 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1522 1523 // Set entry point to interpreter if in InterpretOnly mode. 1524 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1525 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1526 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1527 } 1528 1529 // reinit class_roots_ 1530 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1531 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1532 1533 // reinit array_iftable_ from any array class instance, they should be == 1534 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1535 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1536 // String class root was set above 1537 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1538 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1539 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1540 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1541 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1542 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1543 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1544 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1545 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1546 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1547 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1548 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1549 1550 FinishInit(self); 1551 1552 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1553} 1554 1555void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1556 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1557 if ((flags & kVisitRootFlagAllRoots) != 0) { 1558 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1559 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1560 } 1561 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1562 for (auto& pair : new_class_roots_) { 1563 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1564 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1565 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1566 if (UNLIKELY(new_ref != old_ref)) { 1567 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1568 // corresponding object. This is slow, but luckily for us, this may only happen with a 1569 // concurrent moving GC. 1570 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1571 it != end && it->first == pair.first; ++it) { 1572 // If the class stored matches the old class, update it to the new value. 1573 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1574 it->second = GcRoot<mirror::Class>(new_ref); 1575 } 1576 } 1577 } 1578 } 1579 } 1580 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1581 new_class_roots_.clear(); 1582 } 1583 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1584 log_new_class_table_roots_ = true; 1585 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1586 log_new_class_table_roots_ = false; 1587 } 1588 // We deliberately ignore the class roots in the image since we 1589 // handle image roots by using the MS/CMS rescanning of dirty cards. 1590} 1591 1592// Keep in sync with InitCallback. Anything we visit, we need to 1593// reinit references to when reinitializing a ClassLinker from a 1594// mapped image. 1595void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1596 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1597 Thread* self = Thread::Current(); 1598 { 1599 ReaderMutexLock mu(self, dex_lock_); 1600 if ((flags & kVisitRootFlagAllRoots) != 0) { 1601 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1602 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1603 } 1604 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1605 for (size_t index : new_dex_cache_roots_) { 1606 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1607 } 1608 } 1609 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1610 new_dex_cache_roots_.clear(); 1611 } 1612 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1613 log_new_dex_caches_roots_ = true; 1614 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1615 log_new_dex_caches_roots_ = false; 1616 } 1617 } 1618 VisitClassRoots(callback, arg, flags); 1619 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1620 DCHECK(!array_iftable_.IsNull()); 1621 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1622 if (!find_array_class_cache_[i].IsNull()) { 1623 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1624 } 1625 } 1626} 1627 1628void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1629 if (dex_cache_image_class_lookup_required_) { 1630 MoveImageClassesToClassTable(); 1631 } 1632 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1633 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1634 mirror::Class* c = it.second.Read(); 1635 if (!visitor(c, arg)) { 1636 return; 1637 } 1638 } 1639} 1640 1641static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1642 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1643 classes->insert(c); 1644 return true; 1645} 1646 1647void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1648 std::set<mirror::Class*> classes; 1649 VisitClasses(GetClassesVisitor, &classes); 1650 for (mirror::Class* klass : classes) { 1651 if (!visitor(klass, arg)) { 1652 return; 1653 } 1654 } 1655} 1656 1657ClassLinker::~ClassLinker() { 1658 mirror::Class::ResetClass(); 1659 mirror::String::ResetClass(); 1660 mirror::Reference::ResetClass(); 1661 mirror::ArtField::ResetClass(); 1662 mirror::ArtMethod::ResetClass(); 1663 mirror::BooleanArray::ResetArrayClass(); 1664 mirror::ByteArray::ResetArrayClass(); 1665 mirror::CharArray::ResetArrayClass(); 1666 mirror::DoubleArray::ResetArrayClass(); 1667 mirror::FloatArray::ResetArrayClass(); 1668 mirror::IntArray::ResetArrayClass(); 1669 mirror::LongArray::ResetArrayClass(); 1670 mirror::ShortArray::ResetArrayClass(); 1671 mirror::Throwable::ResetClass(); 1672 mirror::StackTraceElement::ResetClass(); 1673 STLDeleteElements(&boot_class_path_); 1674 STLDeleteElements(&oat_files_); 1675} 1676 1677mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1678 gc::Heap* heap = Runtime::Current()->GetHeap(); 1679 StackHandleScope<16> hs(self); 1680 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1681 Handle<mirror::DexCache> dex_cache( 1682 hs.NewHandle(down_cast<mirror::DexCache*>( 1683 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1684 VoidFunctor())))); 1685 if (dex_cache.Get() == NULL) { 1686 return NULL; 1687 } 1688 Handle<mirror::String> 1689 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1690 if (location.Get() == NULL) { 1691 return NULL; 1692 } 1693 Handle<mirror::ObjectArray<mirror::String>> 1694 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1695 if (strings.Get() == NULL) { 1696 return NULL; 1697 } 1698 Handle<mirror::ObjectArray<mirror::Class>> 1699 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1700 if (types.Get() == NULL) { 1701 return NULL; 1702 } 1703 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1704 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1705 if (methods.Get() == NULL) { 1706 return NULL; 1707 } 1708 Handle<mirror::ObjectArray<mirror::ArtField>> 1709 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1710 if (fields.Get() == NULL) { 1711 return NULL; 1712 } 1713 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1714 fields.Get()); 1715 return dex_cache.Get(); 1716} 1717 1718mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1719 uint32_t class_size) { 1720 DCHECK_GE(class_size, sizeof(mirror::Class)); 1721 gc::Heap* heap = Runtime::Current()->GetHeap(); 1722 mirror::Class::InitializeClassVisitor visitor(class_size); 1723 mirror::Object* k = kMovingClasses ? 1724 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1725 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1726 if (UNLIKELY(k == nullptr)) { 1727 CHECK(self->IsExceptionPending()); // OOME. 1728 return nullptr; 1729 } 1730 return k->AsClass(); 1731} 1732 1733mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1734 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1735} 1736 1737mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1738 return down_cast<mirror::ArtField*>( 1739 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1740} 1741 1742mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1743 return down_cast<mirror::ArtMethod*>( 1744 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1745} 1746 1747mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1748 Thread* self, size_t length) { 1749 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1750 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1751} 1752 1753mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1754 mirror::Class* klass) { 1755 DCHECK(klass != NULL); 1756 1757 // For temporary classes we must wait for them to be retired. 1758 if (init_done_ && klass->IsTemp()) { 1759 CHECK(!klass->IsResolved()); 1760 if (klass->IsErroneous()) { 1761 ThrowEarlierClassFailure(klass); 1762 return nullptr; 1763 } 1764 StackHandleScope<1> hs(self); 1765 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1766 ObjectLock<mirror::Class> lock(self, h_class); 1767 // Loop and wait for the resolving thread to retire this class. 1768 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1769 lock.WaitIgnoringInterrupts(); 1770 } 1771 if (h_class->IsErroneous()) { 1772 ThrowEarlierClassFailure(h_class.Get()); 1773 return nullptr; 1774 } 1775 CHECK(h_class->IsRetired()); 1776 // Get the updated class from class table. 1777 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1778 } 1779 1780 // Wait for the class if it has not already been linked. 1781 if (!klass->IsResolved() && !klass->IsErroneous()) { 1782 StackHandleScope<1> hs(self); 1783 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1784 ObjectLock<mirror::Class> lock(self, h_class); 1785 // Check for circular dependencies between classes. 1786 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1787 ThrowClassCircularityError(h_class.Get()); 1788 h_class->SetStatus(mirror::Class::kStatusError, self); 1789 return nullptr; 1790 } 1791 // Wait for the pending initialization to complete. 1792 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1793 lock.WaitIgnoringInterrupts(); 1794 } 1795 } 1796 1797 if (klass->IsErroneous()) { 1798 ThrowEarlierClassFailure(klass); 1799 return nullptr; 1800 } 1801 // Return the loaded class. No exceptions should be pending. 1802 CHECK(klass->IsResolved()) << PrettyClass(klass); 1803 self->AssertNoPendingException(); 1804 return klass; 1805} 1806 1807mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1808 Handle<mirror::ClassLoader> class_loader) { 1809 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1810 DCHECK(self != nullptr); 1811 self->AssertNoPendingException(); 1812 if (descriptor[1] == '\0') { 1813 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1814 // for primitive classes that aren't backed by dex files. 1815 return FindPrimitiveClass(descriptor[0]); 1816 } 1817 // Find the class in the loaded classes table. 1818 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1819 if (klass != NULL) { 1820 return EnsureResolved(self, descriptor, klass); 1821 } 1822 // Class is not yet loaded. 1823 if (descriptor[0] == '[') { 1824 return CreateArrayClass(self, descriptor, class_loader); 1825 } else if (class_loader.Get() == nullptr) { 1826 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1827 if (pair.second != NULL) { 1828 StackHandleScope<1> hs(self); 1829 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1830 } 1831 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1832 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1833 // throw of a NoClassDefFoundError. 1834 if (IsInBootClassPath(descriptor)) { 1835 mirror::Class* system_class = FindSystemClass(self, descriptor); 1836 CHECK(system_class != NULL); 1837 return system_class; 1838 } 1839 // Next try the compile time class path. 1840 const std::vector<const DexFile*>* class_path; 1841 { 1842 ScopedObjectAccessUnchecked soa(self); 1843 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1844 soa.AddLocalReference<jobject>(class_loader.Get())); 1845 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1846 } 1847 1848 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1849 if (pair.second != NULL) { 1850 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1851 } 1852 1853 } else { 1854 ScopedObjectAccessUnchecked soa(self); 1855 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1856 soa.AddLocalReference<jobject>(class_loader.Get())); 1857 std::string class_name_string(DescriptorToDot(descriptor)); 1858 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1859 { 1860 ScopedThreadStateChange tsc(self, kNative); 1861 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1862 soa.Env()->NewStringUTF(class_name_string.c_str())); 1863 if (class_name_object.get() == NULL) { 1864 return NULL; 1865 } 1866 CHECK(class_loader_object.get() != NULL); 1867 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1868 WellKnownClasses::java_lang_ClassLoader_loadClass, 1869 class_name_object.get())); 1870 } 1871 if (self->IsExceptionPending()) { 1872 // If the ClassLoader threw, pass that exception up. 1873 return NULL; 1874 } else if (result.get() == NULL) { 1875 // broken loader - throw NPE to be compatible with Dalvik 1876 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1877 class_name_string.c_str()).c_str()); 1878 return NULL; 1879 } else { 1880 // success, return mirror::Class* 1881 return soa.Decode<mirror::Class*>(result.get()); 1882 } 1883 } 1884 1885 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1886 return NULL; 1887} 1888 1889mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1890 Handle<mirror::ClassLoader> class_loader, 1891 const DexFile& dex_file, 1892 const DexFile::ClassDef& dex_class_def) { 1893 Thread* self = Thread::Current(); 1894 StackHandleScope<3> hs(self); 1895 auto klass = hs.NewHandle<mirror::Class>(nullptr); 1896 bool should_allocate = false; 1897 1898 // Load the class from the dex file. 1899 if (UNLIKELY(!init_done_)) { 1900 // finish up init of hand crafted class_roots_ 1901 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1902 klass.Assign(GetClassRoot(kJavaLangObject)); 1903 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1904 klass.Assign(GetClassRoot(kJavaLangClass)); 1905 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1906 klass.Assign(GetClassRoot(kJavaLangString)); 1907 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 1908 klass.Assign(GetClassRoot(kJavaLangRefReference)); 1909 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1910 klass.Assign(GetClassRoot(kJavaLangDexCache)); 1911 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1912 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 1913 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1914 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 1915 } else { 1916 should_allocate = true; 1917 } 1918 } else { 1919 should_allocate = true; 1920 } 1921 1922 if (should_allocate) { 1923 // Allocate a class with the status of not ready. 1924 // Interface object should get the right size here. Regular class will 1925 // figure out the right size later and be replaced with one of the right 1926 // size when the class becomes resolved. 1927 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 1928 } 1929 if (UNLIKELY(klass.Get() == nullptr)) { 1930 CHECK(self->IsExceptionPending()); // Expect an OOME. 1931 return nullptr; 1932 } 1933 klass->SetDexCache(FindDexCache(dex_file)); 1934 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 1935 ObjectLock<mirror::Class> lock(self, klass); 1936 if (self->IsExceptionPending()) { 1937 // An exception occured during load, set status to erroneous while holding klass' lock in case 1938 // notification is necessary. 1939 if (!klass->IsErroneous()) { 1940 klass->SetStatus(mirror::Class::kStatusError, self); 1941 } 1942 return nullptr; 1943 } 1944 klass->SetClinitThreadId(self->GetTid()); 1945 1946 // Add the newly loaded class to the loaded classes table. 1947 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 1948 if (existing != nullptr) { 1949 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1950 // this thread to block. 1951 return EnsureResolved(self, descriptor, existing); 1952 } 1953 1954 // Finish loading (if necessary) by finding parents 1955 CHECK(!klass->IsLoaded()); 1956 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1957 // Loading failed. 1958 if (!klass->IsErroneous()) { 1959 klass->SetStatus(mirror::Class::kStatusError, self); 1960 } 1961 return nullptr; 1962 } 1963 CHECK(klass->IsLoaded()); 1964 // Link the class (if necessary) 1965 CHECK(!klass->IsResolved()); 1966 // TODO: Use fast jobjects? 1967 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1968 1969 mirror::Class* new_class = nullptr; 1970 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 1971 // Linking failed. 1972 if (!klass->IsErroneous()) { 1973 klass->SetStatus(mirror::Class::kStatusError, self); 1974 } 1975 return nullptr; 1976 } 1977 CHECK(new_class != nullptr) << descriptor; 1978 CHECK(new_class->IsResolved()) << descriptor; 1979 1980 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 1981 1982 /* 1983 * We send CLASS_PREPARE events to the debugger from here. The 1984 * definition of "preparation" is creating the static fields for a 1985 * class and initializing them to the standard default values, but not 1986 * executing any code (that comes later, during "initialization"). 1987 * 1988 * We did the static preparation in LinkClass. 1989 * 1990 * The class has been prepared and resolved but possibly not yet verified 1991 * at this point. 1992 */ 1993 Dbg::PostClassPrepare(new_class_h.Get()); 1994 1995 return new_class_h.Get(); 1996} 1997 1998uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 1999 const DexFile::ClassDef& dex_class_def) { 2000 const byte* class_data = dex_file.GetClassData(dex_class_def); 2001 size_t num_ref = 0; 2002 size_t num_32 = 0; 2003 size_t num_64 = 0; 2004 if (class_data != NULL) { 2005 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2006 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2007 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2008 char c = descriptor[0]; 2009 if (c == 'L' || c == '[') { 2010 num_ref++; 2011 } else if (c == 'J' || c == 'D') { 2012 num_64++; 2013 } else { 2014 num_32++; 2015 } 2016 } 2017 } 2018 return mirror::Class::ComputeClassSize(false, 0, num_32, num_64, num_ref); 2019} 2020 2021OatFile::OatClass ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 2022 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2023 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2024 CHECK(oat_file != NULL) << dex_file.GetLocation(); 2025 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2026 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2027 &dex_location_checksum); 2028 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 2029 return oat_dex_file->GetOatClass(class_def_idx); 2030} 2031 2032static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2033 uint32_t method_idx) { 2034 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2035 const byte* class_data = dex_file.GetClassData(class_def); 2036 CHECK(class_data != NULL); 2037 ClassDataItemIterator it(dex_file, class_data); 2038 // Skip fields 2039 while (it.HasNextStaticField()) { 2040 it.Next(); 2041 } 2042 while (it.HasNextInstanceField()) { 2043 it.Next(); 2044 } 2045 // Process methods 2046 size_t class_def_method_index = 0; 2047 while (it.HasNextDirectMethod()) { 2048 if (it.GetMemberIndex() == method_idx) { 2049 return class_def_method_index; 2050 } 2051 class_def_method_index++; 2052 it.Next(); 2053 } 2054 while (it.HasNextVirtualMethod()) { 2055 if (it.GetMemberIndex() == method_idx) { 2056 return class_def_method_index; 2057 } 2058 class_def_method_index++; 2059 it.Next(); 2060 } 2061 DCHECK(!it.HasNext()); 2062 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2063 return 0; 2064} 2065 2066const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 2067 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2068 // method for direct methods (or virtual methods made direct). 2069 mirror::Class* declaring_class = method->GetDeclaringClass(); 2070 size_t oat_method_index; 2071 if (method->IsStatic() || method->IsDirect()) { 2072 // Simple case where the oat method index was stashed at load time. 2073 oat_method_index = method->GetMethodIndex(); 2074 } else { 2075 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2076 // by search for its position in the declared virtual methods. 2077 oat_method_index = declaring_class->NumDirectMethods(); 2078 size_t end = declaring_class->NumVirtualMethods(); 2079 bool found = false; 2080 for (size_t i = 0; i < end; i++) { 2081 if (declaring_class->GetVirtualMethod(i) == method) { 2082 found = true; 2083 break; 2084 } 2085 oat_method_index++; 2086 } 2087 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2088 } 2089 DCHECK_EQ(oat_method_index, 2090 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2091 method->GetDeclaringClass()->GetDexClassDefIndex(), 2092 method->GetDexMethodIndex())); 2093 const OatFile::OatClass oat_class = GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2094 declaring_class->GetDexClassDefIndex()); 2095 2096 return oat_class.GetOatMethod(oat_method_index); 2097} 2098 2099// Special case to get oat code without overwriting a trampoline. 2100const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2101 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2102 if (method->IsProxyMethod()) { 2103 return GetQuickProxyInvokeHandler(); 2104 } 2105 const void* result = GetOatMethodFor(method).GetQuickCode(); 2106 if (result == nullptr) { 2107 if (method->IsNative()) { 2108 // No code and native? Use generic trampoline. 2109 result = GetQuickGenericJniTrampoline(); 2110 } else if (method->IsPortableCompiled()) { 2111 // No code? Do we expect portable code? 2112 result = GetQuickToPortableBridge(); 2113 } else { 2114 // No code? You must mean to go into the interpreter. 2115 result = GetQuickToInterpreterBridge(); 2116 } 2117 } 2118 return result; 2119} 2120 2121const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2122 bool* have_portable_code) { 2123 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2124 *have_portable_code = false; 2125 if (method->IsProxyMethod()) { 2126 return GetPortableProxyInvokeHandler(); 2127 } 2128 const OatFile::OatMethod oat_method = GetOatMethodFor(method); 2129 const void* result = oat_method.GetPortableCode(); 2130 if (result == nullptr) { 2131 if (oat_method.GetQuickCode() == nullptr) { 2132 // No code? You must mean to go into the interpreter. 2133 result = GetPortableToInterpreterBridge(); 2134 } else { 2135 // No code? But there's quick code, so use a bridge. 2136 result = GetPortableToQuickBridge(); 2137 } 2138 } else { 2139 *have_portable_code = true; 2140 } 2141 return result; 2142} 2143 2144const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2145 uint32_t method_idx) { 2146 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 2147 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2148 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2149} 2150 2151const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2152 uint32_t method_idx) { 2153 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 2154 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2155 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2156} 2157 2158// Returns true if the method must run with interpreter, false otherwise. 2159static bool NeedsInterpreter( 2160 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2161 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2162 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2163 // No code: need interpreter. 2164 // May return true for native code, in the case of generic JNI 2165 // DCHECK(!method->IsNative()); 2166 return true; 2167 } 2168#ifdef ART_SEA_IR_MODE 2169 ScopedObjectAccess soa(Thread::Current()); 2170 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2171 LOG(INFO) << "Found " << PrettyMethod(method); 2172 return false; 2173 } 2174#endif 2175 // If interpreter mode is enabled, every method (except native and proxy) must 2176 // be run with interpreter. 2177 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2178 !method->IsNative() && !method->IsProxyMethod(); 2179} 2180 2181void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2182 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2183 if (klass->NumDirectMethods() == 0) { 2184 return; // No direct methods => no static methods. 2185 } 2186 Runtime* runtime = Runtime::Current(); 2187 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2188 return; // OAT file unavailable. 2189 } 2190 const DexFile& dex_file = klass->GetDexFile(); 2191 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2192 CHECK(dex_class_def != nullptr); 2193 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2194 // There should always be class data if there were direct methods. 2195 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2196 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 2197 ClassDataItemIterator it(dex_file, class_data); 2198 // Skip fields 2199 while (it.HasNextStaticField()) { 2200 it.Next(); 2201 } 2202 while (it.HasNextInstanceField()) { 2203 it.Next(); 2204 } 2205 // Link the code of methods skipped by LinkCode. 2206 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2207 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2208 if (!method->IsStatic()) { 2209 // Only update static methods. 2210 continue; 2211 } 2212 const void* portable_code = oat_class.GetOatMethod(method_index).GetPortableCode(); 2213 const void* quick_code = oat_class.GetOatMethod(method_index).GetQuickCode(); 2214 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2215 bool have_portable_code = false; 2216 if (enter_interpreter) { 2217 // Use interpreter entry point. 2218 // Check whether the method is native, in which case it's generic JNI. 2219 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2220 quick_code = GetQuickGenericJniTrampoline(); 2221 portable_code = GetPortableToQuickBridge(); 2222 } else { 2223 portable_code = GetPortableToInterpreterBridge(); 2224 quick_code = GetQuickToInterpreterBridge(); 2225 } 2226 } else { 2227 if (portable_code == nullptr) { 2228 portable_code = GetPortableToQuickBridge(); 2229 } else { 2230 have_portable_code = true; 2231 } 2232 if (quick_code == nullptr) { 2233 quick_code = GetQuickToPortableBridge(); 2234 } 2235 } 2236 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2237 have_portable_code); 2238 } 2239 // Ignore virtual methods on the iterator. 2240} 2241 2242void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 2243 const DexFile& dex_file, uint32_t dex_method_index, 2244 uint32_t method_index) { 2245 // Method shouldn't have already been linked. 2246 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2247 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2248 // Every kind of method should at least get an invoke stub from the oat_method. 2249 // non-abstract methods also get their code pointers. 2250 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2251 oat_method.LinkMethod(method.Get()); 2252 2253 // Install entry point from interpreter. 2254 Runtime* runtime = Runtime::Current(); 2255 bool enter_interpreter = NeedsInterpreter(method.Get(), 2256 method->GetEntryPointFromQuickCompiledCode(), 2257 method->GetEntryPointFromPortableCompiledCode()); 2258 if (enter_interpreter && !method->IsNative()) { 2259 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2260 } else { 2261 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2262 } 2263 2264 if (method->IsAbstract()) { 2265 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2266 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2267 return; 2268 } 2269 2270 bool have_portable_code = false; 2271 if (method->IsStatic() && !method->IsConstructor()) { 2272 // For static methods excluding the class initializer, install the trampoline. 2273 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2274 // after initializing class (see ClassLinker::InitializeClass method). 2275 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2276 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2277 } else if (enter_interpreter) { 2278 if (!method->IsNative()) { 2279 // Set entry point from compiled code if there's no code or in interpreter only mode. 2280 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2281 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2282 } else { 2283 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2284 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2285 } 2286 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2287 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2288 have_portable_code = true; 2289 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2290 } else { 2291 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2292 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2293 } 2294 2295 if (method->IsNative()) { 2296 // Unregistering restores the dlsym lookup stub. 2297 method->UnregisterNative(Thread::Current()); 2298 2299 if (enter_interpreter) { 2300 // We have a native method here without code. Then it should have either the GenericJni 2301 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2302 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2303 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2304 } 2305 } 2306 2307 // Allow instrumentation its chance to hijack code. 2308 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2309 method->GetEntryPointFromQuickCompiledCode(), 2310 method->GetEntryPointFromPortableCompiledCode(), 2311 have_portable_code); 2312} 2313 2314void ClassLinker::LoadClass(const DexFile& dex_file, 2315 const DexFile::ClassDef& dex_class_def, 2316 Handle<mirror::Class> klass, 2317 mirror::ClassLoader* class_loader) { 2318 CHECK(klass.Get() != NULL); 2319 CHECK(klass->GetDexCache() != NULL); 2320 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2321 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2322 CHECK(descriptor != NULL); 2323 2324 klass->SetClass(GetClassRoot(kJavaLangClass)); 2325 if (kUseBakerOrBrooksReadBarrier) { 2326 klass->AssertReadBarrierPointer(); 2327 } 2328 uint32_t access_flags = dex_class_def.access_flags_; 2329 // Make sure that none of our runtime-only flags are set. 2330 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2331 klass->SetAccessFlags(access_flags); 2332 klass->SetClassLoader(class_loader); 2333 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2334 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2335 2336 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2337 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2338 2339 const byte* class_data = dex_file.GetClassData(dex_class_def); 2340 if (class_data == NULL) { 2341 return; // no fields or methods - for example a marker interface 2342 } 2343 2344 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2345 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 2346 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2347 } else { 2348 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2349 } 2350} 2351 2352void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2353 const byte* class_data, 2354 Handle<mirror::Class> klass, 2355 mirror::ClassLoader* class_loader, 2356 const OatFile::OatClass* oat_class) { 2357 // Load fields. 2358 ClassDataItemIterator it(dex_file, class_data); 2359 Thread* self = Thread::Current(); 2360 if (it.NumStaticFields() != 0) { 2361 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2362 if (UNLIKELY(statics == NULL)) { 2363 CHECK(self->IsExceptionPending()); // OOME. 2364 return; 2365 } 2366 klass->SetSFields(statics); 2367 } 2368 if (it.NumInstanceFields() != 0) { 2369 mirror::ObjectArray<mirror::ArtField>* fields = 2370 AllocArtFieldArray(self, it.NumInstanceFields()); 2371 if (UNLIKELY(fields == NULL)) { 2372 CHECK(self->IsExceptionPending()); // OOME. 2373 return; 2374 } 2375 klass->SetIFields(fields); 2376 } 2377 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2378 StackHandleScope<1> hs(self); 2379 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2380 if (UNLIKELY(sfield.Get() == NULL)) { 2381 CHECK(self->IsExceptionPending()); // OOME. 2382 return; 2383 } 2384 klass->SetStaticField(i, sfield.Get()); 2385 LoadField(dex_file, it, klass, sfield); 2386 } 2387 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2388 StackHandleScope<1> hs(self); 2389 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2390 if (UNLIKELY(ifield.Get() == NULL)) { 2391 CHECK(self->IsExceptionPending()); // OOME. 2392 return; 2393 } 2394 klass->SetInstanceField(i, ifield.Get()); 2395 LoadField(dex_file, it, klass, ifield); 2396 } 2397 2398 // Load methods. 2399 if (it.NumDirectMethods() != 0) { 2400 // TODO: append direct methods to class object 2401 mirror::ObjectArray<mirror::ArtMethod>* directs = 2402 AllocArtMethodArray(self, it.NumDirectMethods()); 2403 if (UNLIKELY(directs == NULL)) { 2404 CHECK(self->IsExceptionPending()); // OOME. 2405 return; 2406 } 2407 klass->SetDirectMethods(directs); 2408 } 2409 if (it.NumVirtualMethods() != 0) { 2410 // TODO: append direct methods to class object 2411 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2412 AllocArtMethodArray(self, it.NumVirtualMethods()); 2413 if (UNLIKELY(virtuals == NULL)) { 2414 CHECK(self->IsExceptionPending()); // OOME. 2415 return; 2416 } 2417 klass->SetVirtualMethods(virtuals); 2418 } 2419 size_t class_def_method_index = 0; 2420 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2421 StackHandleScope<1> hs(self); 2422 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2423 if (UNLIKELY(method.Get() == NULL)) { 2424 CHECK(self->IsExceptionPending()); // OOME. 2425 return; 2426 } 2427 klass->SetDirectMethod(i, method.Get()); 2428 if (oat_class != nullptr) { 2429 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2430 } 2431 method->SetMethodIndex(class_def_method_index); 2432 class_def_method_index++; 2433 } 2434 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2435 StackHandleScope<1> hs(self); 2436 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2437 if (UNLIKELY(method.Get() == NULL)) { 2438 CHECK(self->IsExceptionPending()); // OOME. 2439 return; 2440 } 2441 klass->SetVirtualMethod(i, method.Get()); 2442 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2443 if (oat_class != nullptr) { 2444 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2445 } 2446 class_def_method_index++; 2447 } 2448 DCHECK(!it.HasNext()); 2449} 2450 2451void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2452 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2453 uint32_t field_idx = it.GetMemberIndex(); 2454 dst->SetDexFieldIndex(field_idx); 2455 dst->SetDeclaringClass(klass.Get()); 2456 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2457} 2458 2459mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2460 const ClassDataItemIterator& it, 2461 Handle<mirror::Class> klass) { 2462 uint32_t dex_method_idx = it.GetMemberIndex(); 2463 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2464 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2465 2466 mirror::ArtMethod* dst = AllocArtMethod(self); 2467 if (UNLIKELY(dst == NULL)) { 2468 CHECK(self->IsExceptionPending()); // OOME. 2469 return NULL; 2470 } 2471 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2472 2473 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2474 dst->SetDexMethodIndex(dex_method_idx); 2475 dst->SetDeclaringClass(klass.Get()); 2476 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2477 2478 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2479 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2480 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2481 2482 uint32_t access_flags = it.GetMemberAccessFlags(); 2483 2484 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2485 // Set finalizable flag on declaring class. 2486 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2487 // Void return type. 2488 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 2489 klass->SetFinalizable(); 2490 } else { 2491 std::string klass_descriptor = klass->GetDescriptor(); 2492 // The Enum class declares a "final" finalize() method to prevent subclasses from 2493 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2494 // subclasses, so we exclude it here. 2495 // We also want to avoid setting the flag on Object, where we know that finalize() is 2496 // empty. 2497 if (klass_descriptor.compare("Ljava/lang/Object;") != 0 && 2498 klass_descriptor.compare("Ljava/lang/Enum;") != 0) { 2499 klass->SetFinalizable(); 2500 } 2501 } 2502 } 2503 } else if (method_name[0] == '<') { 2504 // Fix broken access flags for initializers. Bug 11157540. 2505 bool is_init = (strcmp("<init>", method_name) == 0); 2506 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2507 if (UNLIKELY(!is_init && !is_clinit)) { 2508 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2509 } else { 2510 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2511 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2512 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2513 access_flags |= kAccConstructor; 2514 } 2515 } 2516 } 2517 dst->SetAccessFlags(access_flags); 2518 2519 self->EndAssertNoThreadSuspension(old_cause); 2520 return dst; 2521} 2522 2523void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2524 Thread* self = Thread::Current(); 2525 StackHandleScope<1> hs(self); 2526 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2527 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2528 AppendToBootClassPath(dex_file, dex_cache); 2529} 2530 2531void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2532 Handle<mirror::DexCache> dex_cache) { 2533 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2534 boot_class_path_.push_back(&dex_file); 2535 RegisterDexFile(dex_file, dex_cache); 2536} 2537 2538bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2539 dex_lock_.AssertSharedHeld(Thread::Current()); 2540 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2541 mirror::DexCache* dex_cache = GetDexCache(i); 2542 if (dex_cache->GetDexFile() == &dex_file) { 2543 return true; 2544 } 2545 } 2546 return false; 2547} 2548 2549bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2550 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2551 return IsDexFileRegisteredLocked(dex_file); 2552} 2553 2554void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2555 Handle<mirror::DexCache> dex_cache) { 2556 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2557 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2558 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2559 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2560 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2561 dex_cache->SetDexFile(&dex_file); 2562 if (log_new_dex_caches_roots_) { 2563 // TODO: This is not safe if we can remove dex caches. 2564 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2565 } 2566} 2567 2568void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2569 Thread* self = Thread::Current(); 2570 { 2571 ReaderMutexLock mu(self, dex_lock_); 2572 if (IsDexFileRegisteredLocked(dex_file)) { 2573 return; 2574 } 2575 } 2576 // Don't alloc while holding the lock, since allocation may need to 2577 // suspend all threads and another thread may need the dex_lock_ to 2578 // get to a suspend point. 2579 StackHandleScope<1> hs(self); 2580 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2581 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2582 { 2583 WriterMutexLock mu(self, dex_lock_); 2584 if (IsDexFileRegisteredLocked(dex_file)) { 2585 return; 2586 } 2587 RegisterDexFileLocked(dex_file, dex_cache); 2588 } 2589} 2590 2591void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2592 Handle<mirror::DexCache> dex_cache) { 2593 WriterMutexLock mu(Thread::Current(), dex_lock_); 2594 RegisterDexFileLocked(dex_file, dex_cache); 2595} 2596 2597mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2598 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2599 // Search assuming unique-ness of dex file. 2600 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2601 mirror::DexCache* dex_cache = GetDexCache(i); 2602 if (dex_cache->GetDexFile() == &dex_file) { 2603 return dex_cache; 2604 } 2605 } 2606 // Search matching by location name. 2607 std::string location(dex_file.GetLocation()); 2608 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2609 mirror::DexCache* dex_cache = GetDexCache(i); 2610 if (dex_cache->GetDexFile()->GetLocation() == location) { 2611 return dex_cache; 2612 } 2613 } 2614 // Failure, dump diagnostic and abort. 2615 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2616 mirror::DexCache* dex_cache = GetDexCache(i); 2617 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2618 } 2619 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2620 return NULL; 2621} 2622 2623void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2624 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2625 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2626 mirror::DexCache* dex_cache = GetDexCache(i); 2627 dex_cache->Fixup(resolution_method); 2628 } 2629} 2630 2631mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2632 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 2633 if (UNLIKELY(klass == NULL)) { 2634 return NULL; 2635 } 2636 return InitializePrimitiveClass(klass, type); 2637} 2638 2639mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2640 Primitive::Type type) { 2641 CHECK(primitive_class != NULL); 2642 // Must hold lock on object when initializing. 2643 Thread* self = Thread::Current(); 2644 StackHandleScope<1> hs(self); 2645 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2646 ObjectLock<mirror::Class> lock(self, h_class); 2647 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2648 primitive_class->SetPrimitiveType(type); 2649 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2650 const char* descriptor = Primitive::Descriptor(type); 2651 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2652 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2653 return primitive_class; 2654} 2655 2656// Create an array class (i.e. the class object for the array, not the 2657// array itself). "descriptor" looks like "[C" or "[[[[B" or 2658// "[Ljava/lang/String;". 2659// 2660// If "descriptor" refers to an array of primitives, look up the 2661// primitive type's internally-generated class object. 2662// 2663// "class_loader" is the class loader of the class that's referring to 2664// us. It's used to ensure that we're looking for the element type in 2665// the right context. It does NOT become the class loader for the 2666// array class; that always comes from the base element class. 2667// 2668// Returns NULL with an exception raised on failure. 2669mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2670 Handle<mirror::ClassLoader> class_loader) { 2671 // Identify the underlying component type 2672 CHECK_EQ('[', descriptor[0]); 2673 StackHandleScope<2> hs(self); 2674 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2675 if (component_type.Get() == nullptr) { 2676 DCHECK(self->IsExceptionPending()); 2677 // We need to accept erroneous classes as component types. 2678 component_type.Assign(LookupClass(descriptor + 1, class_loader.Get())); 2679 if (component_type.Get() == nullptr) { 2680 DCHECK(self->IsExceptionPending()); 2681 return nullptr; 2682 } else { 2683 self->ClearException(); 2684 } 2685 } 2686 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2687 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2688 return nullptr; 2689 } 2690 // See if the component type is already loaded. Array classes are 2691 // always associated with the class loader of their underlying 2692 // element type -- an array of Strings goes with the loader for 2693 // java/lang/String -- so we need to look for it there. (The 2694 // caller should have checked for the existence of the class 2695 // before calling here, but they did so with *their* class loader, 2696 // not the component type's loader.) 2697 // 2698 // If we find it, the caller adds "loader" to the class' initiating 2699 // loader list, which should prevent us from going through this again. 2700 // 2701 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2702 // are the same, because our caller (FindClass) just did the 2703 // lookup. (Even if we get this wrong we still have correct behavior, 2704 // because we effectively do this lookup again when we add the new 2705 // class to the hash table --- necessary because of possible races with 2706 // other threads.) 2707 if (class_loader.Get() != component_type->GetClassLoader()) { 2708 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2709 if (new_class != NULL) { 2710 return new_class; 2711 } 2712 } 2713 2714 // Fill out the fields in the Class. 2715 // 2716 // It is possible to execute some methods against arrays, because 2717 // all arrays are subclasses of java_lang_Object_, so we need to set 2718 // up a vtable. We can just point at the one in java_lang_Object_. 2719 // 2720 // Array classes are simple enough that we don't need to do a full 2721 // link step. 2722 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2723 if (UNLIKELY(!init_done_)) { 2724 // Classes that were hand created, ie not by FindSystemClass 2725 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2726 new_class.Assign(GetClassRoot(kClassArrayClass)); 2727 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2728 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2729 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2730 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2731 } else if (strcmp(descriptor, 2732 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2733 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2734 } else if (strcmp(descriptor, 2735 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2736 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2737 } else if (strcmp(descriptor, "[C") == 0) { 2738 new_class.Assign(GetClassRoot(kCharArrayClass)); 2739 } else if (strcmp(descriptor, "[I") == 0) { 2740 new_class.Assign(GetClassRoot(kIntArrayClass)); 2741 } 2742 } 2743 if (new_class.Get() == nullptr) { 2744 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 2745 if (new_class.Get() == nullptr) { 2746 return nullptr; 2747 } 2748 new_class->SetComponentType(component_type.Get()); 2749 } 2750 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2751 DCHECK(new_class->GetComponentType() != NULL); 2752 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2753 new_class->SetSuperClass(java_lang_Object); 2754 new_class->SetVTable(java_lang_Object->GetVTable()); 2755 new_class->SetPrimitiveType(Primitive::kPrimNot); 2756 new_class->SetClassLoader(component_type->GetClassLoader()); 2757 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 2758 new_class->PopulateEmbeddedImtAndVTable(); 2759 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2760 // don't need to set new_class->SetObjectSize(..) 2761 // because Object::SizeOf delegates to Array::SizeOf 2762 2763 2764 // All arrays have java/lang/Cloneable and java/io/Serializable as 2765 // interfaces. We need to set that up here, so that stuff like 2766 // "instanceof" works right. 2767 // 2768 // Note: The GC could run during the call to FindSystemClass, 2769 // so we need to make sure the class object is GC-valid while we're in 2770 // there. Do this by clearing the interface list so the GC will just 2771 // think that the entries are null. 2772 2773 2774 // Use the single, global copies of "interfaces" and "iftable" 2775 // (remember not to free them for arrays). 2776 { 2777 mirror::IfTable* array_iftable = array_iftable_.Read(); 2778 CHECK(array_iftable != nullptr); 2779 new_class->SetIfTable(array_iftable); 2780 } 2781 2782 // Inherit access flags from the component type. 2783 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2784 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2785 access_flags &= kAccJavaFlagsMask; 2786 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2787 // and remove "interface". 2788 access_flags |= kAccAbstract | kAccFinal; 2789 access_flags &= ~kAccInterface; 2790 2791 new_class->SetAccessFlags(access_flags); 2792 2793 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2794 if (existing == nullptr) { 2795 return new_class.Get(); 2796 } 2797 // Another thread must have loaded the class after we 2798 // started but before we finished. Abandon what we've 2799 // done. 2800 // 2801 // (Yes, this happens.) 2802 2803 return existing; 2804} 2805 2806mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2807 switch (type) { 2808 case 'B': 2809 return GetClassRoot(kPrimitiveByte); 2810 case 'C': 2811 return GetClassRoot(kPrimitiveChar); 2812 case 'D': 2813 return GetClassRoot(kPrimitiveDouble); 2814 case 'F': 2815 return GetClassRoot(kPrimitiveFloat); 2816 case 'I': 2817 return GetClassRoot(kPrimitiveInt); 2818 case 'J': 2819 return GetClassRoot(kPrimitiveLong); 2820 case 'S': 2821 return GetClassRoot(kPrimitiveShort); 2822 case 'Z': 2823 return GetClassRoot(kPrimitiveBoolean); 2824 case 'V': 2825 return GetClassRoot(kPrimitiveVoid); 2826 default: 2827 break; 2828 } 2829 std::string printable_type(PrintableChar(type)); 2830 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2831 return NULL; 2832} 2833 2834mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2835 size_t hash) { 2836 if (VLOG_IS_ON(class_linker)) { 2837 mirror::DexCache* dex_cache = klass->GetDexCache(); 2838 std::string source; 2839 if (dex_cache != NULL) { 2840 source += " from "; 2841 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2842 } 2843 LOG(INFO) << "Loaded class " << descriptor << source; 2844 } 2845 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2846 mirror::Class* existing = 2847 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2848 if (existing != NULL) { 2849 return existing; 2850 } 2851 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == NULL && 2852 dex_cache_image_class_lookup_required_) { 2853 // Check a class loaded with the system class loader matches one in the image if the class 2854 // is in the image. 2855 existing = LookupClassFromImage(descriptor); 2856 if (existing != NULL) { 2857 CHECK(klass == existing); 2858 } 2859 } 2860 VerifyObject(klass); 2861 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 2862 if (log_new_class_table_roots_) { 2863 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 2864 } 2865 return NULL; 2866} 2867 2868mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 2869 size_t hash) { 2870 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2871 mirror::Class* existing = 2872 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2873 2874 if (existing == nullptr) { 2875 CHECK(klass->IsProxyClass()); 2876 return nullptr; 2877 } 2878 2879 CHECK_NE(existing, klass) << descriptor; 2880 CHECK(!existing->IsResolved()) << descriptor; 2881 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 2882 2883 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2884 ++it) { 2885 mirror::Class* klass = it->second.Read(); 2886 if (klass == existing) { 2887 class_table_.erase(it); 2888 break; 2889 } 2890 } 2891 2892 CHECK(!klass->IsTemp()) << descriptor; 2893 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 2894 dex_cache_image_class_lookup_required_) { 2895 // Check a class loaded with the system class loader matches one in the image if the class 2896 // is in the image. 2897 existing = LookupClassFromImage(descriptor); 2898 if (existing != nullptr) { 2899 CHECK(klass == existing) << descriptor; 2900 } 2901 } 2902 VerifyObject(klass); 2903 2904 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 2905 if (log_new_class_table_roots_) { 2906 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 2907 } 2908 2909 return existing; 2910} 2911 2912bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2913 size_t hash = Hash(descriptor); 2914 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2915 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2916 it != end && it->first == hash; 2917 ++it) { 2918 mirror::Class* klass = it->second.Read(); 2919 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2920 class_table_.erase(it); 2921 return true; 2922 } 2923 } 2924 return false; 2925} 2926 2927mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2928 const mirror::ClassLoader* class_loader) { 2929 size_t hash = Hash(descriptor); 2930 { 2931 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2932 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2933 if (result != NULL) { 2934 return result; 2935 } 2936 } 2937 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2938 return NULL; 2939 } else { 2940 // Lookup failed but need to search dex_caches_. 2941 mirror::Class* result = LookupClassFromImage(descriptor); 2942 if (result != NULL) { 2943 InsertClass(descriptor, result, hash); 2944 } else { 2945 // Searching the image dex files/caches failed, we don't want to get into this situation 2946 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2947 // classes into the class table. 2948 const int32_t kMaxFailedDexCacheLookups = 1000; 2949 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2950 MoveImageClassesToClassTable(); 2951 } 2952 } 2953 return result; 2954 } 2955} 2956 2957mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2958 const mirror::ClassLoader* class_loader, 2959 size_t hash) { 2960 auto end = class_table_.end(); 2961 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2962 mirror::Class* klass = it->second.Read(); 2963 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2964 if (kIsDebugBuild) { 2965 // Check for duplicates in the table. 2966 for (++it; it != end && it->first == hash; ++it) { 2967 mirror::Class* klass2 = it->second.Read(); 2968 CHECK(!(klass2->GetClassLoader() == class_loader && 2969 klass2->DescriptorEquals(descriptor))) 2970 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2971 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2972 } 2973 } 2974 return klass; 2975 } 2976 } 2977 return NULL; 2978} 2979 2980static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2981 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2982 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2983 CHECK(image != NULL); 2984 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2985 return root->AsObjectArray<mirror::DexCache>(); 2986} 2987 2988void ClassLinker::MoveImageClassesToClassTable() { 2989 Thread* self = Thread::Current(); 2990 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2991 if (!dex_cache_image_class_lookup_required_) { 2992 return; // All dex cache classes are already in the class table. 2993 } 2994 const char* old_no_suspend_cause = 2995 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2996 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2997 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2998 mirror::DexCache* dex_cache = dex_caches->Get(i); 2999 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3000 for (int32_t j = 0; j < types->GetLength(); j++) { 3001 mirror::Class* klass = types->Get(j); 3002 if (klass != NULL) { 3003 DCHECK(klass->GetClassLoader() == NULL); 3004 std::string descriptor = klass->GetDescriptor(); 3005 size_t hash = Hash(descriptor.c_str()); 3006 mirror::Class* existing = LookupClassFromTableLocked(descriptor.c_str(), NULL, hash); 3007 if (existing != NULL) { 3008 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3009 << PrettyClassAndClassLoader(klass); 3010 } else { 3011 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3012 if (log_new_class_table_roots_) { 3013 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3014 } 3015 } 3016 } 3017 } 3018 } 3019 dex_cache_image_class_lookup_required_ = false; 3020 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3021} 3022 3023mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3024 Thread* self = Thread::Current(); 3025 const char* old_no_suspend_cause = 3026 self->StartAssertNoThreadSuspension("Image class lookup"); 3027 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3028 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3029 mirror::DexCache* dex_cache = dex_caches->Get(i); 3030 const DexFile* dex_file = dex_cache->GetDexFile(); 3031 // Try binary searching the string/type index. 3032 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3033 if (string_id != NULL) { 3034 const DexFile::TypeId* type_id = 3035 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3036 if (type_id != NULL) { 3037 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3038 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3039 if (klass != NULL) { 3040 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3041 return klass; 3042 } 3043 } 3044 } 3045 } 3046 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3047 return NULL; 3048} 3049 3050void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3051 result.clear(); 3052 if (dex_cache_image_class_lookup_required_) { 3053 MoveImageClassesToClassTable(); 3054 } 3055 size_t hash = Hash(descriptor); 3056 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3057 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3058 it != end && it->first == hash; ++it) { 3059 mirror::Class* klass = it->second.Read(); 3060 if (klass->DescriptorEquals(descriptor)) { 3061 result.push_back(klass); 3062 } 3063 } 3064} 3065 3066void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 3067 // TODO: assert that the monitor on the Class is held 3068 Thread* self = Thread::Current(); 3069 ObjectLock<mirror::Class> lock(self, klass); 3070 3071 // Don't attempt to re-verify if already sufficiently verified. 3072 if (klass->IsVerified() || 3073 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 3074 return; 3075 } 3076 3077 // The class might already be erroneous, for example at compile time if we attempted to verify 3078 // this class as a parent to another. 3079 if (klass->IsErroneous()) { 3080 ThrowEarlierClassFailure(klass.Get()); 3081 return; 3082 } 3083 3084 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3085 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3086 } else { 3087 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3088 << PrettyClass(klass.Get()); 3089 CHECK(!Runtime::Current()->IsCompiler()); 3090 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3091 } 3092 3093 // Skip verification if disabled. 3094 if (!Runtime::Current()->IsVerificationEnabled()) { 3095 klass->SetStatus(mirror::Class::kStatusVerified, self); 3096 return; 3097 } 3098 3099 // Verify super class. 3100 StackHandleScope<2> hs(self); 3101 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3102 if (super.Get() != NULL) { 3103 // Acquire lock to prevent races on verifying the super class. 3104 ObjectLock<mirror::Class> lock(self, super); 3105 3106 if (!super->IsVerified() && !super->IsErroneous()) { 3107 VerifyClass(super); 3108 } 3109 if (!super->IsCompileTimeVerified()) { 3110 std::string error_msg( 3111 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3112 PrettyDescriptor(klass.Get()).c_str(), 3113 PrettyDescriptor(super.Get()).c_str())); 3114 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3115 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3116 if (cause.Get() != nullptr) { 3117 self->ClearException(); 3118 } 3119 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3120 if (cause.Get() != nullptr) { 3121 self->GetException(nullptr)->SetCause(cause.Get()); 3122 } 3123 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3124 if (Runtime::Current()->IsCompiler()) { 3125 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3126 } 3127 klass->SetStatus(mirror::Class::kStatusError, self); 3128 return; 3129 } 3130 } 3131 3132 // Try to use verification information from the oat file, otherwise do runtime verification. 3133 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3134 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3135 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3136 if (oat_file_class_status == mirror::Class::kStatusError) { 3137 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3138 << PrettyDescriptor(klass.Get()) << " in " 3139 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3140 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3141 PrettyDescriptor(klass.Get()).c_str()); 3142 klass->SetStatus(mirror::Class::kStatusError, self); 3143 return; 3144 } 3145 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3146 std::string error_msg; 3147 if (!preverified) { 3148 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 3149 Runtime::Current()->IsCompiler(), 3150 &error_msg); 3151 } 3152 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3153 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3154 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3155 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3156 << " because: " << error_msg; 3157 } 3158 self->AssertNoPendingException(); 3159 // Make sure all classes referenced by catch blocks are resolved. 3160 ResolveClassExceptionHandlerTypes(dex_file, klass); 3161 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3162 // Even though there were no verifier failures we need to respect whether the super-class 3163 // was verified or requiring runtime reverification. 3164 if (super.Get() == NULL || super->IsVerified()) { 3165 klass->SetStatus(mirror::Class::kStatusVerified, self); 3166 } else { 3167 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3168 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3169 // Pretend a soft failure occured so that we don't consider the class verified below. 3170 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3171 } 3172 } else { 3173 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3174 // Soft failures at compile time should be retried at runtime. Soft 3175 // failures at runtime will be handled by slow paths in the generated 3176 // code. Set status accordingly. 3177 if (Runtime::Current()->IsCompiler()) { 3178 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3179 } else { 3180 klass->SetStatus(mirror::Class::kStatusVerified, self); 3181 } 3182 } 3183 } else { 3184 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3185 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3186 << " because: " << error_msg; 3187 self->AssertNoPendingException(); 3188 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3189 klass->SetStatus(mirror::Class::kStatusError, self); 3190 } 3191 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3192 // Class is verified so we don't need to do any access check on its methods. 3193 // Let the interpreter know it by setting the kAccPreverified flag onto each 3194 // method. 3195 // Note: we're going here during compilation and at runtime. When we set the 3196 // kAccPreverified flag when compiling image classes, the flag is recorded 3197 // in the image and is set when loading the image. 3198 klass->SetPreverifiedFlagOnAllMethods(); 3199 } 3200} 3201 3202bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3203 mirror::Class::Status& oat_file_class_status) { 3204 // If we're compiling, we can only verify the class using the oat file if 3205 // we are not compiling the image or if the class we're verifying is not part of 3206 // the app. In other words, we will only check for preverification of bootclasspath 3207 // classes. 3208 if (Runtime::Current()->IsCompiler()) { 3209 // Are we compiling the bootclasspath? 3210 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3211 return false; 3212 } 3213 // We are compiling an app (not the image). 3214 3215 // Is this an app class? (I.e. not a bootclasspath class) 3216 if (klass->GetClassLoader() != NULL) { 3217 return false; 3218 } 3219 } 3220 3221 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 3222 // Make this work with gtests, which do not set up the image properly. 3223 // TODO: we should clean up gtests to set up the image path properly. 3224 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 3225 return false; 3226 } 3227 3228 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3229 uint dex_location_checksum = dex_file.GetLocationChecksum(); 3230 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 3231 &dex_location_checksum); 3232 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3233 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3234 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3235 if (oat_file_class_status == mirror::Class::kStatusVerified || 3236 oat_file_class_status == mirror::Class::kStatusInitialized) { 3237 return true; 3238 } 3239 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3240 // Compile time verification failed with a soft error. Compile time verification can fail 3241 // because we have incomplete type information. Consider the following: 3242 // class ... { 3243 // Foo x; 3244 // .... () { 3245 // if (...) { 3246 // v1 gets assigned a type of resolved class Foo 3247 // } else { 3248 // v1 gets assigned a type of unresolved class Bar 3249 // } 3250 // iput x = v1 3251 // } } 3252 // when we merge v1 following the if-the-else it results in Conflict 3253 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3254 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3255 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3256 // at compile time). 3257 return false; 3258 } 3259 if (oat_file_class_status == mirror::Class::kStatusError) { 3260 // Compile time verification failed with a hard error. This is caused by invalid instructions 3261 // in the class. These errors are unrecoverable. 3262 return false; 3263 } 3264 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3265 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3266 // not loading the class. 3267 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3268 // isn't a problem and this case shouldn't occur 3269 return false; 3270 } 3271 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3272 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3273 << klass->GetDescriptor(); 3274 3275 return false; 3276} 3277 3278void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3279 Handle<mirror::Class> klass) { 3280 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3281 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3282 } 3283 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3284 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3285 } 3286} 3287 3288void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3289 mirror::ArtMethod* method) { 3290 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3291 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3292 if (code_item == NULL) { 3293 return; // native or abstract method 3294 } 3295 if (code_item->tries_size_ == 0) { 3296 return; // nothing to process 3297 } 3298 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3299 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3300 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3301 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3302 CatchHandlerIterator iterator(handlers_ptr); 3303 for (; iterator.HasNext(); iterator.Next()) { 3304 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3305 // unresolved exception types will be ignored by exception delivery 3306 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3307 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3308 if (exception_type == NULL) { 3309 DCHECK(Thread::Current()->IsExceptionPending()); 3310 Thread::Current()->ClearException(); 3311 } 3312 } 3313 } 3314 handlers_ptr = iterator.EndDataPointer(); 3315 } 3316} 3317 3318static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3319static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3320 Handle<mirror::ArtMethod> prototype); 3321 3322mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3323 jobjectArray interfaces, jobject loader, 3324 jobjectArray methods, jobjectArray throws) { 3325 Thread* self = soa.Self(); 3326 StackHandleScope<8> hs(self); 3327 Handle<mirror::Class> klass(hs.NewHandle( 3328 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3329 if (klass.Get() == NULL) { 3330 CHECK(self->IsExceptionPending()); // OOME. 3331 return NULL; 3332 } 3333 DCHECK(klass->GetClass() != NULL); 3334 klass->SetObjectSize(sizeof(mirror::Proxy)); 3335 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 3336 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3337 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3338 klass->SetName(soa.Decode<mirror::String*>(name)); 3339 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3340 klass->SetDexCache(proxy_class->GetDexCache()); 3341 klass->SetStatus(mirror::Class::kStatusIdx, self); 3342 3343 // Instance fields are inherited, but we add a couple of static fields... 3344 { 3345 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3346 if (UNLIKELY(sfields == NULL)) { 3347 CHECK(self->IsExceptionPending()); // OOME. 3348 return NULL; 3349 } 3350 klass->SetSFields(sfields); 3351 } 3352 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3353 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3354 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3355 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3356 CHECK(self->IsExceptionPending()); // OOME. 3357 return nullptr; 3358 } 3359 klass->SetStaticField(0, interfaces_sfield.Get()); 3360 interfaces_sfield->SetDexFieldIndex(0); 3361 interfaces_sfield->SetDeclaringClass(klass.Get()); 3362 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3363 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3364 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3365 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3366 CHECK(self->IsExceptionPending()); // OOME. 3367 return nullptr; 3368 } 3369 klass->SetStaticField(1, throws_sfield.Get()); 3370 throws_sfield->SetDexFieldIndex(1); 3371 throws_sfield->SetDeclaringClass(klass.Get()); 3372 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3373 3374 // Proxies have 1 direct method, the constructor 3375 { 3376 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3377 if (UNLIKELY(directs == nullptr)) { 3378 CHECK(self->IsExceptionPending()); // OOME. 3379 return nullptr; 3380 } 3381 klass->SetDirectMethods(directs); 3382 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3383 if (UNLIKELY(constructor == nullptr)) { 3384 CHECK(self->IsExceptionPending()); // OOME. 3385 return nullptr; 3386 } 3387 klass->SetDirectMethod(0, constructor); 3388 } 3389 3390 // Create virtual method using specified prototypes. 3391 size_t num_virtual_methods = 3392 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3393 { 3394 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3395 num_virtual_methods); 3396 if (UNLIKELY(virtuals == NULL)) { 3397 CHECK(self->IsExceptionPending()); // OOME. 3398 return NULL; 3399 } 3400 klass->SetVirtualMethods(virtuals); 3401 } 3402 for (size_t i = 0; i < num_virtual_methods; ++i) { 3403 StackHandleScope<1> hs(self); 3404 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3405 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3406 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3407 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3408 if (UNLIKELY(clone == nullptr)) { 3409 CHECK(self->IsExceptionPending()); // OOME. 3410 return nullptr; 3411 } 3412 klass->SetVirtualMethod(i, clone); 3413 } 3414 3415 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3416 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3417 self->AssertNoPendingException(); 3418 3419 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3420 mirror::Class* new_class = nullptr; 3421 { 3422 ObjectLock<mirror::Class> resolution_lock(self, klass); // Must hold lock on object when resolved. 3423 // Link the fields and virtual methods, creating vtable and iftables 3424 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3425 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3426 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3427 klass->SetStatus(mirror::Class::kStatusError, self); 3428 return nullptr; 3429 } 3430 } 3431 3432 CHECK(klass->IsRetired()); 3433 CHECK_NE(klass.Get(), new_class); 3434 klass.Assign(new_class); 3435 3436 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3437 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3438 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3439 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3440 3441 { 3442 // Lock on klass is released. Lock new class object. 3443 ObjectLock<mirror::Class> initialization_lock(self, klass); 3444 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3445 } 3446 3447 // sanity checks 3448 if (kIsDebugBuild) { 3449 CHECK(klass->GetIFields() == nullptr); 3450 CheckProxyConstructor(klass->GetDirectMethod(0)); 3451 for (size_t i = 0; i < num_virtual_methods; ++i) { 3452 StackHandleScope<2> hs(self); 3453 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3454 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3455 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3456 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3457 CheckProxyMethod(virtual_method, prototype); 3458 } 3459 3460 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3461 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3462 decoded_name->ToModifiedUtf8().c_str())); 3463 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3464 3465 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3466 decoded_name->ToModifiedUtf8().c_str())); 3467 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3468 3469 CHECK_EQ(klass.Get()->GetInterfaces(), 3470 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3471 CHECK_EQ(klass.Get()->GetThrows(), 3472 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3473 } 3474 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3475 CHECK(existing == nullptr); 3476 return klass.Get(); 3477} 3478 3479std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3480 DCHECK(proxy_class->IsProxyClass()); 3481 mirror::String* name = proxy_class->GetName(); 3482 DCHECK(name != NULL); 3483 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3484} 3485 3486mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3487 mirror::ArtMethod* proxy_method) { 3488 DCHECK(proxy_class->IsProxyClass()); 3489 DCHECK(proxy_method->IsProxyMethod()); 3490 // Locate the dex cache of the original interface/Object 3491 mirror::DexCache* dex_cache = NULL; 3492 { 3493 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 3494 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3495 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3496 mirror::DexCache* a_dex_cache = GetDexCache(i); 3497 if (a_dex_cache->GetResolvedTypes() == resolved_types) { 3498 dex_cache = a_dex_cache; 3499 break; 3500 } 3501 } 3502 } 3503 CHECK(dex_cache != NULL); 3504 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3505 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3506 CHECK(resolved_method != NULL); 3507 return resolved_method; 3508} 3509 3510 3511mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3512 Handle<mirror::Class> klass, 3513 mirror::Class* proxy_class) { 3514 // Create constructor for Proxy that must initialize h 3515 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3516 proxy_class->GetDirectMethods(); 3517 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3518 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3519 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3520 // code_ too) 3521 mirror::ArtMethod* constructor = 3522 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3523 if (constructor == NULL) { 3524 CHECK(self->IsExceptionPending()); // OOME. 3525 return NULL; 3526 } 3527 // Make this constructor public and fix the class to be our Proxy version 3528 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3529 constructor->SetDeclaringClass(klass.Get()); 3530 return constructor; 3531} 3532 3533static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3534 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3535 CHECK(constructor->IsConstructor()); 3536 CHECK_STREQ(constructor->GetName(), "<init>"); 3537 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3538 "(Ljava/lang/reflect/InvocationHandler;)V"); 3539 DCHECK(constructor->IsPublic()); 3540} 3541 3542mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3543 Handle<mirror::Class> klass, 3544 Handle<mirror::ArtMethod> prototype) { 3545 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3546 // prototype method 3547 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3548 prototype.Get()); 3549 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3550 // as necessary 3551 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3552 if (UNLIKELY(method == NULL)) { 3553 CHECK(self->IsExceptionPending()); // OOME. 3554 return NULL; 3555 } 3556 3557 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3558 // the intersection of throw exceptions as defined in Proxy 3559 method->SetDeclaringClass(klass.Get()); 3560 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3561 3562 // At runtime the method looks like a reference and argument saving method, clone the code 3563 // related parameters from this method. 3564 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3565 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3566 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3567 3568 return method; 3569} 3570 3571static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3572 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3573 // Basic sanity 3574 CHECK(!prototype->IsFinal()); 3575 CHECK(method->IsFinal()); 3576 CHECK(!method->IsAbstract()); 3577 3578 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3579 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3580 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3581 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 3582 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 3583 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3584 3585 MethodHelper mh(method); 3586 MethodHelper mh2(prototype); 3587 CHECK_STREQ(method->GetName(), prototype->GetName()); 3588 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3589 // More complex sanity - via dex cache 3590 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3591} 3592 3593static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3594 bool can_init_parents) 3595 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3596 if (can_init_statics && can_init_parents) { 3597 return true; 3598 } 3599 if (!can_init_statics) { 3600 // Check if there's a class initializer. 3601 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3602 if (clinit != NULL) { 3603 return false; 3604 } 3605 // Check if there are encoded static values needing initialization. 3606 if (klass->NumStaticFields() != 0) { 3607 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3608 DCHECK(dex_class_def != NULL); 3609 if (dex_class_def->static_values_off_ != 0) { 3610 return false; 3611 } 3612 } 3613 } 3614 if (!klass->IsInterface() && klass->HasSuperClass()) { 3615 mirror::Class* super_class = klass->GetSuperClass(); 3616 if (!can_init_parents && !super_class->IsInitialized()) { 3617 return false; 3618 } else { 3619 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3620 return false; 3621 } 3622 } 3623 } 3624 return true; 3625} 3626 3627bool ClassLinker::IsInitialized() const { 3628 return init_done_; 3629} 3630 3631bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3632 bool can_init_parents) { 3633 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3634 3635 // Are we already initialized and therefore done? 3636 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3637 // an initialized class will never change its state. 3638 if (klass->IsInitialized()) { 3639 return true; 3640 } 3641 3642 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3643 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3644 return false; 3645 } 3646 3647 Thread* self = Thread::Current(); 3648 uint64_t t0; 3649 { 3650 ObjectLock<mirror::Class> lock(self, klass); 3651 3652 // Re-check under the lock in case another thread initialized ahead of us. 3653 if (klass->IsInitialized()) { 3654 return true; 3655 } 3656 3657 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3658 if (klass->IsErroneous()) { 3659 ThrowEarlierClassFailure(klass.Get()); 3660 return false; 3661 } 3662 3663 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3664 3665 if (!klass->IsVerified()) { 3666 VerifyClass(klass); 3667 if (!klass->IsVerified()) { 3668 // We failed to verify, expect either the klass to be erroneous or verification failed at 3669 // compile time. 3670 if (klass->IsErroneous()) { 3671 CHECK(self->IsExceptionPending()); 3672 } else { 3673 CHECK(Runtime::Current()->IsCompiler()); 3674 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3675 } 3676 return false; 3677 } 3678 } 3679 3680 // If the class is kStatusInitializing, either this thread is 3681 // initializing higher up the stack or another thread has beat us 3682 // to initializing and we need to wait. Either way, this 3683 // invocation of InitializeClass will not be responsible for 3684 // running <clinit> and will return. 3685 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3686 // We caught somebody else in the act; was it us? 3687 if (klass->GetClinitThreadId() == self->GetTid()) { 3688 // Yes. That's fine. Return so we can continue initializing. 3689 return true; 3690 } 3691 // No. That's fine. Wait for another thread to finish initializing. 3692 return WaitForInitializeClass(klass, self, lock); 3693 } 3694 3695 if (!ValidateSuperClassDescriptors(klass)) { 3696 klass->SetStatus(mirror::Class::kStatusError, self); 3697 return false; 3698 } 3699 3700 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3701 3702 // From here out other threads may observe that we're initializing and so changes of state 3703 // require the a notification. 3704 klass->SetClinitThreadId(self->GetTid()); 3705 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3706 3707 t0 = NanoTime(); 3708 } 3709 3710 // Initialize super classes, must be done while initializing for the JLS. 3711 if (!klass->IsInterface() && klass->HasSuperClass()) { 3712 mirror::Class* super_class = klass->GetSuperClass(); 3713 if (!super_class->IsInitialized()) { 3714 CHECK(!super_class->IsInterface()); 3715 CHECK(can_init_parents); 3716 StackHandleScope<1> hs(self); 3717 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3718 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3719 if (!super_initialized) { 3720 // The super class was verified ahead of entering initializing, we should only be here if 3721 // the super class became erroneous due to initialization. 3722 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3723 << "Super class initialization failed for " 3724 << PrettyDescriptor(handle_scope_super.Get()) 3725 << " that has unexpected status " << handle_scope_super->GetStatus() 3726 << "\nPending exception:\n" 3727 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3728 ObjectLock<mirror::Class> lock(self, klass); 3729 // Initialization failed because the super-class is erroneous. 3730 klass->SetStatus(mirror::Class::kStatusError, self); 3731 return false; 3732 } 3733 } 3734 } 3735 3736 if (klass->NumStaticFields() > 0) { 3737 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3738 CHECK(dex_class_def != NULL); 3739 const DexFile& dex_file = klass->GetDexFile(); 3740 StackHandleScope<2> hs(self); 3741 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3742 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3743 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3744 this, *dex_class_def); 3745 if (it.HasNext()) { 3746 CHECK(can_init_statics); 3747 // We reordered the fields, so we need to be able to map the 3748 // field indexes to the right fields. 3749 SafeMap<uint32_t, mirror::ArtField*> field_map; 3750 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3751 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3752 if (Runtime::Current()->IsActiveTransaction()) { 3753 it.ReadValueToField<true>(field_map.Get(i)); 3754 } else { 3755 it.ReadValueToField<false>(field_map.Get(i)); 3756 } 3757 } 3758 } 3759 } 3760 3761 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3762 if (clinit != NULL) { 3763 CHECK(can_init_statics); 3764 JValue result; 3765 clinit->Invoke(self, NULL, 0, &result, "V"); 3766 } 3767 3768 uint64_t t1 = NanoTime(); 3769 3770 bool success = true; 3771 { 3772 ObjectLock<mirror::Class> lock(self, klass); 3773 3774 if (self->IsExceptionPending()) { 3775 WrapExceptionInInitializer(); 3776 klass->SetStatus(mirror::Class::kStatusError, self); 3777 success = false; 3778 } else { 3779 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3780 RuntimeStats* thread_stats = self->GetStats(); 3781 ++global_stats->class_init_count; 3782 ++thread_stats->class_init_count; 3783 global_stats->class_init_time_ns += (t1 - t0); 3784 thread_stats->class_init_time_ns += (t1 - t0); 3785 // Set the class as initialized except if failed to initialize static fields. 3786 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3787 if (VLOG_IS_ON(class_linker)) { 3788 LOG(INFO) << "Initialized class " << klass->GetDescriptor() << " from " << 3789 klass->GetLocation(); 3790 } 3791 // Opportunistically set static method trampolines to their destination. 3792 FixupStaticTrampolines(klass.Get()); 3793 } 3794 } 3795 return success; 3796} 3797 3798bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3799 ObjectLock<mirror::Class>& lock) 3800 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3801 while (true) { 3802 self->AssertNoPendingException(); 3803 CHECK(!klass->IsInitialized()); 3804 lock.WaitIgnoringInterrupts(); 3805 3806 // When we wake up, repeat the test for init-in-progress. If 3807 // there's an exception pending (only possible if 3808 // "interruptShouldThrow" was set), bail out. 3809 if (self->IsExceptionPending()) { 3810 WrapExceptionInInitializer(); 3811 klass->SetStatus(mirror::Class::kStatusError, self); 3812 return false; 3813 } 3814 // Spurious wakeup? Go back to waiting. 3815 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3816 continue; 3817 } 3818 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3819 // Compile time initialization failed. 3820 return false; 3821 } 3822 if (klass->IsErroneous()) { 3823 // The caller wants an exception, but it was thrown in a 3824 // different thread. Synthesize one here. 3825 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3826 PrettyDescriptor(klass.Get()).c_str()); 3827 return false; 3828 } 3829 if (klass->IsInitialized()) { 3830 return true; 3831 } 3832 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 3833 << klass->GetStatus(); 3834 } 3835 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 3836} 3837 3838bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 3839 if (klass->IsInterface()) { 3840 return true; 3841 } 3842 // Begin with the methods local to the superclass. 3843 StackHandleScope<2> hs(Thread::Current()); 3844 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3845 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3846 if (klass->HasSuperClass() && 3847 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3848 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 3849 mh.ChangeMethod(klass->GetVTableEntry(i)); 3850 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 3851 if (mh.GetMethod() != super_mh.GetMethod() && 3852 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3853 ThrowLinkageError(klass.Get(), 3854 "Class %s method %s resolves differently in superclass %s", 3855 PrettyDescriptor(klass.Get()).c_str(), 3856 PrettyMethod(mh.GetMethod()).c_str(), 3857 PrettyDescriptor(klass->GetSuperClass()).c_str()); 3858 return false; 3859 } 3860 } 3861 } 3862 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3863 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 3864 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 3865 for (uint32_t j = 0; j < num_methods; ++j) { 3866 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 3867 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 3868 if (mh.GetMethod() != super_mh.GetMethod() && 3869 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3870 ThrowLinkageError(klass.Get(), 3871 "Class %s method %s resolves differently in interface %s", 3872 PrettyDescriptor(klass.Get()).c_str(), 3873 PrettyMethod(mh.GetMethod()).c_str(), 3874 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 3875 return false; 3876 } 3877 } 3878 } 3879 } 3880 return true; 3881} 3882 3883bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 3884 bool can_init_parents) { 3885 DCHECK(c.Get() != nullptr); 3886 const bool success = c->IsInitialized() || InitializeClass(c, can_init_fields, can_init_parents); 3887 if (!success && can_init_fields && can_init_parents) { 3888 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.Get()); 3889 } 3890 return success; 3891} 3892 3893void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3894 mirror::Class* c, 3895 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3896 const byte* class_data = dex_file.GetClassData(dex_class_def); 3897 ClassDataItemIterator it(dex_file, class_data); 3898 StackHandleScope<2> hs(Thread::Current()); 3899 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 3900 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 3901 CHECK(!kMovingFields); 3902 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3903 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3904 } 3905} 3906 3907void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 3908 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 3909 if (fields != nullptr) { 3910 for (int index = 0; index < fields->GetLength(); index ++) { 3911 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 3912 fields->Get(index)->SetDeclaringClass(new_class); 3913 } 3914 } 3915 } 3916 3917 fields = new_class->GetSFields(); 3918 if (fields != nullptr) { 3919 for (int index = 0; index < fields->GetLength(); index ++) { 3920 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 3921 fields->Get(index)->SetDeclaringClass(new_class); 3922 } 3923 } 3924 } 3925 3926 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 3927 if (methods != nullptr) { 3928 for (int index = 0; index < methods->GetLength(); index ++) { 3929 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 3930 methods->Get(index)->SetDeclaringClass(new_class); 3931 } 3932 } 3933 } 3934 3935 methods = new_class->GetVirtualMethods(); 3936 if (methods != nullptr) { 3937 for (int index = 0; index < methods->GetLength(); index ++) { 3938 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 3939 methods->Get(index)->SetDeclaringClass(new_class); 3940 } 3941 } 3942 } 3943} 3944 3945bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 3946 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 3947 mirror::Class** new_class) { 3948 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3949 3950 if (!LinkSuperClass(klass)) { 3951 return false; 3952 } 3953 if (!LinkMethods(self, klass, interfaces)) { 3954 return false; 3955 } 3956 if (!LinkInstanceFields(klass)) { 3957 return false; 3958 } 3959 size_t class_size; 3960 if (!LinkStaticFields(klass, &class_size)) { 3961 return false; 3962 } 3963 CreateReferenceInstanceOffsets(klass); 3964 CreateReferenceStaticOffsets(klass); 3965 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3966 3967 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 3968 // We don't need to retire this class as it has no embedded tables or it was created the 3969 // correct size during class linker initialization. 3970 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 3971 3972 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 3973 klass->PopulateEmbeddedImtAndVTable(); 3974 } 3975 3976 // This will notify waiters on klass that saw the not yet resolved 3977 // class in the class_table_ during EnsureResolved. 3978 klass->SetStatus(mirror::Class::kStatusResolved, self); 3979 *new_class = klass.Get(); 3980 } else { 3981 CHECK(!klass->IsResolved()); 3982 // Retire the temporary class and create the correctly sized resolved class. 3983 *new_class = klass->CopyOf(self, class_size); 3984 if (UNLIKELY(*new_class == NULL)) { 3985 CHECK(self->IsExceptionPending()); // Expect an OOME. 3986 klass->SetStatus(mirror::Class::kStatusError, self); 3987 return false; 3988 } 3989 3990 CHECK_EQ((*new_class)->GetClassSize(), class_size); 3991 StackHandleScope<1> hs(self); 3992 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 3993 ObjectLock<mirror::Class> lock(self, new_class_h); 3994 3995 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 3996 3997 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 3998 CHECK(existing == NULL || existing == klass.Get()); 3999 4000 // This will notify waiters on temp class that saw the not yet resolved class in the 4001 // class_table_ during EnsureResolved. 4002 klass->SetStatus(mirror::Class::kStatusRetired, self); 4003 4004 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4005 // This will notify waiters on new_class that saw the not yet resolved 4006 // class in the class_table_ during EnsureResolved. 4007 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4008 } 4009 return true; 4010} 4011 4012bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4013 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4014 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4015 uint16_t super_class_idx = class_def.superclass_idx_; 4016 if (super_class_idx != DexFile::kDexNoIndex16) { 4017 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4018 if (super_class == NULL) { 4019 DCHECK(Thread::Current()->IsExceptionPending()); 4020 return false; 4021 } 4022 // Verify 4023 if (!klass->CanAccess(super_class)) { 4024 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4025 PrettyDescriptor(super_class).c_str(), 4026 PrettyDescriptor(klass.Get()).c_str()); 4027 return false; 4028 } 4029 CHECK(super_class->IsResolved()); 4030 klass->SetSuperClass(super_class); 4031 } 4032 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4033 if (interfaces != NULL) { 4034 for (size_t i = 0; i < interfaces->Size(); i++) { 4035 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4036 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4037 if (interface == NULL) { 4038 DCHECK(Thread::Current()->IsExceptionPending()); 4039 return false; 4040 } 4041 // Verify 4042 if (!klass->CanAccess(interface)) { 4043 // TODO: the RI seemed to ignore this in my testing. 4044 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4045 PrettyDescriptor(interface).c_str(), 4046 PrettyDescriptor(klass.Get()).c_str()); 4047 return false; 4048 } 4049 } 4050 } 4051 // Mark the class as loaded. 4052 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 4053 return true; 4054} 4055 4056bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4057 CHECK(!klass->IsPrimitive()); 4058 mirror::Class* super = klass->GetSuperClass(); 4059 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4060 if (super != NULL) { 4061 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4062 return false; 4063 } 4064 return true; 4065 } 4066 if (super == NULL) { 4067 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4068 PrettyDescriptor(klass.Get()).c_str()); 4069 return false; 4070 } 4071 // Verify 4072 if (super->IsFinal() || super->IsInterface()) { 4073 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4074 PrettyDescriptor(super).c_str(), 4075 PrettyDescriptor(klass.Get()).c_str(), 4076 super->IsFinal() ? "declared final" : "an interface"); 4077 return false; 4078 } 4079 if (!klass->CanAccess(super)) { 4080 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4081 PrettyDescriptor(super).c_str(), 4082 PrettyDescriptor(klass.Get()).c_str()); 4083 return false; 4084 } 4085 4086 // Inherit kAccClassIsFinalizable from the superclass in case this 4087 // class doesn't override finalize. 4088 if (super->IsFinalizable()) { 4089 klass->SetFinalizable(); 4090 } 4091 4092 // Inherit reference flags (if any) from the superclass. 4093 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4094 if (reference_flags != 0) { 4095 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4096 } 4097 // Disallow custom direct subclasses of java.lang.ref.Reference. 4098 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4099 ThrowLinkageError(klass.Get(), 4100 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4101 PrettyDescriptor(klass.Get()).c_str()); 4102 return false; 4103 } 4104 4105 if (kIsDebugBuild) { 4106 // Ensure super classes are fully resolved prior to resolving fields.. 4107 while (super != NULL) { 4108 CHECK(super->IsResolved()); 4109 super = super->GetSuperClass(); 4110 } 4111 } 4112 return true; 4113} 4114 4115// Populate the class vtable and itable. Compute return type indices. 4116bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4117 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4118 if (klass->IsInterface()) { 4119 // No vtable. 4120 size_t count = klass->NumVirtualMethods(); 4121 if (!IsUint(16, count)) { 4122 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4123 return false; 4124 } 4125 for (size_t i = 0; i < count; ++i) { 4126 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4127 } 4128 // Link interface method tables 4129 return LinkInterfaceMethods(klass, interfaces); 4130 } else { 4131 // Link virtual and interface method tables 4132 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4133 } 4134 return true; 4135} 4136 4137bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4138 if (klass->HasSuperClass()) { 4139 uint32_t max_count = klass->NumVirtualMethods() + 4140 klass->GetSuperClass()->GetVTableLength(); 4141 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4142 CHECK_LE(actual_count, max_count); 4143 StackHandleScope<3> hs(self); 4144 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4145 mirror::Class* super_class = klass->GetSuperClass(); 4146 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4147 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4148 if (UNLIKELY(vtable.Get() == nullptr)) { 4149 CHECK(self->IsExceptionPending()); // OOME. 4150 return false; 4151 } 4152 int len = super_class->GetVTableLength(); 4153 for (int i = 0; i < len; i++) { 4154 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4155 } 4156 } else { 4157 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class); 4158 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4159 if (UNLIKELY(vtable.Get() == nullptr)) { 4160 CHECK(self->IsExceptionPending()); // OOME. 4161 return false; 4162 } 4163 } 4164 4165 // See if any of our virtual methods override the superclass. 4166 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4167 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4168 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4169 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4170 local_mh.ChangeMethod(local_method); 4171 size_t j = 0; 4172 for (; j < actual_count; ++j) { 4173 mirror::ArtMethod* super_method = vtable->Get(j); 4174 super_mh.ChangeMethod(super_method); 4175 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4176 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4177 super_method->GetAccessFlags())) { 4178 if (super_method->IsFinal()) { 4179 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4180 PrettyMethod(local_method).c_str(), 4181 super_method->GetDeclaringClassDescriptor()); 4182 return false; 4183 } 4184 vtable->Set<false>(j, local_method); 4185 local_method->SetMethodIndex(j); 4186 break; 4187 } else { 4188 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4189 << " would have incorrectly overridden the package-private method in " 4190 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4191 } 4192 } 4193 } 4194 if (j == actual_count) { 4195 // Not overriding, append. 4196 vtable->Set<false>(actual_count, local_method); 4197 local_method->SetMethodIndex(actual_count); 4198 actual_count += 1; 4199 } 4200 } 4201 if (!IsUint(16, actual_count)) { 4202 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4203 return false; 4204 } 4205 // Shrink vtable if possible 4206 CHECK_LE(actual_count, max_count); 4207 if (actual_count < max_count) { 4208 vtable.Assign(vtable->CopyOf(self, actual_count)); 4209 if (UNLIKELY(vtable.Get() == NULL)) { 4210 CHECK(self->IsExceptionPending()); // OOME. 4211 return false; 4212 } 4213 } 4214 klass->SetVTable(vtable.Get()); 4215 } else { 4216 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4217 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4218 if (!IsUint(16, num_virtual_methods)) { 4219 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4220 return false; 4221 } 4222 StackHandleScope<1> hs(self); 4223 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4224 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4225 if (UNLIKELY(vtable.Get() == NULL)) { 4226 CHECK(self->IsExceptionPending()); // OOME. 4227 return false; 4228 } 4229 for (size_t i = 0; i < num_virtual_methods; ++i) { 4230 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4231 vtable->Set<false>(i, virtual_method); 4232 virtual_method->SetMethodIndex(i & 0xFFFF); 4233 } 4234 klass->SetVTable(vtable.Get()); 4235 } 4236 return true; 4237} 4238 4239bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 4240 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4241 Thread* const self = Thread::Current(); 4242 Runtime* const runtime = Runtime::Current(); 4243 // Set the imt table to be all conflicts by default. 4244 klass->SetImTable(runtime->GetDefaultImt()); 4245 size_t super_ifcount; 4246 if (klass->HasSuperClass()) { 4247 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4248 } else { 4249 super_ifcount = 0; 4250 } 4251 uint32_t num_interfaces = 4252 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4253 size_t ifcount = super_ifcount + num_interfaces; 4254 for (size_t i = 0; i < num_interfaces; i++) { 4255 mirror::Class* interface = 4256 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4257 interfaces->Get(i); 4258 ifcount += interface->GetIfTableCount(); 4259 } 4260 if (ifcount == 0) { 4261 // Class implements no interfaces. 4262 DCHECK_EQ(klass->GetIfTableCount(), 0); 4263 DCHECK(klass->GetIfTable() == NULL); 4264 return true; 4265 } 4266 if (ifcount == super_ifcount) { 4267 // Class implements same interfaces as parent, are any of these not marker interfaces? 4268 bool has_non_marker_interface = false; 4269 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4270 for (size_t i = 0; i < ifcount; ++i) { 4271 if (super_iftable->GetMethodArrayCount(i) > 0) { 4272 has_non_marker_interface = true; 4273 break; 4274 } 4275 } 4276 if (!has_non_marker_interface) { 4277 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4278 klass->SetIfTable(super_iftable); 4279 return true; 4280 } 4281 } 4282 StackHandleScope<4> hs(self); 4283 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4284 if (UNLIKELY(iftable.Get() == NULL)) { 4285 CHECK(self->IsExceptionPending()); // OOME. 4286 return false; 4287 } 4288 if (super_ifcount != 0) { 4289 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4290 for (size_t i = 0; i < super_ifcount; i++) { 4291 mirror::Class* super_interface = super_iftable->GetInterface(i); 4292 iftable->SetInterface(i, super_interface); 4293 } 4294 } 4295 // Flatten the interface inheritance hierarchy. 4296 size_t idx = super_ifcount; 4297 for (size_t i = 0; i < num_interfaces; i++) { 4298 mirror::Class* interface = 4299 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4300 interfaces->Get(i); 4301 DCHECK(interface != NULL); 4302 if (!interface->IsInterface()) { 4303 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4304 PrettyDescriptor(klass.Get()).c_str(), 4305 PrettyDescriptor(interface->GetDescriptor()).c_str()); 4306 return false; 4307 } 4308 // Check if interface is already in iftable 4309 bool duplicate = false; 4310 for (size_t j = 0; j < idx; j++) { 4311 mirror::Class* existing_interface = iftable->GetInterface(j); 4312 if (existing_interface == interface) { 4313 duplicate = true; 4314 break; 4315 } 4316 } 4317 if (!duplicate) { 4318 // Add this non-duplicate interface. 4319 iftable->SetInterface(idx++, interface); 4320 // Add this interface's non-duplicate super-interfaces. 4321 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4322 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4323 bool super_duplicate = false; 4324 for (size_t k = 0; k < idx; k++) { 4325 mirror::Class* existing_interface = iftable->GetInterface(k); 4326 if (existing_interface == super_interface) { 4327 super_duplicate = true; 4328 break; 4329 } 4330 } 4331 if (!super_duplicate) { 4332 iftable->SetInterface(idx++, super_interface); 4333 } 4334 } 4335 } 4336 } 4337 // Shrink iftable in case duplicates were found 4338 if (idx < ifcount) { 4339 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4340 if (UNLIKELY(iftable.Get() == NULL)) { 4341 CHECK(self->IsExceptionPending()); // OOME. 4342 return false; 4343 } 4344 ifcount = idx; 4345 } else { 4346 CHECK_EQ(idx, ifcount); 4347 } 4348 klass->SetIfTable(iftable.Get()); 4349 4350 // If we're an interface, we don't need the vtable pointers, so we're done. 4351 if (klass->IsInterface()) { 4352 return true; 4353 } 4354 // Allocate imtable 4355 bool imtable_changed = false; 4356 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4357 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4358 if (UNLIKELY(imtable.Get() == NULL)) { 4359 CHECK(self->IsExceptionPending()); // OOME. 4360 return false; 4361 } 4362 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4363 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4364 std::vector<mirror::ArtMethod*> miranda_list; 4365 for (size_t i = 0; i < ifcount; ++i) { 4366 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4367 if (num_methods > 0) { 4368 StackHandleScope<2> hs(self); 4369 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4370 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4371 if (UNLIKELY(method_array.Get() == nullptr)) { 4372 CHECK(self->IsExceptionPending()); // OOME. 4373 return false; 4374 } 4375 iftable->SetMethodArray(i, method_array.Get()); 4376 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4377 hs.NewHandle(klass->GetVTableDuringLinking())); 4378 for (size_t j = 0; j < num_methods; ++j) { 4379 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 4380 interface_mh.ChangeMethod(interface_method); 4381 int32_t k; 4382 // For each method listed in the interface's method list, find the 4383 // matching method in our class's method list. We want to favor the 4384 // subclass over the superclass, which just requires walking 4385 // back from the end of the vtable. (This only matters if the 4386 // superclass defines a private method and this class redefines 4387 // it -- otherwise it would use the same vtable slot. In .dex files 4388 // those don't end up in the virtual method table, so it shouldn't 4389 // matter which direction we go. We walk it backward anyway.) 4390 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4391 mirror::ArtMethod* vtable_method = vtable->Get(k); 4392 vtable_mh.ChangeMethod(vtable_method); 4393 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4394 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 4395 ThrowIllegalAccessError( 4396 klass.Get(), 4397 "Method '%s' implementing interface method '%s' is not public", 4398 PrettyMethod(vtable_method).c_str(), 4399 PrettyMethod(interface_method).c_str()); 4400 return false; 4401 } 4402 method_array->Set<false>(j, vtable_method); 4403 // Place method in imt if entry is empty, place conflict otherwise. 4404 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4405 if (imtable->Get(imt_index) == NULL) { 4406 imtable->Set<false>(imt_index, vtable_method); 4407 imtable_changed = true; 4408 } else { 4409 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4410 } 4411 break; 4412 } 4413 } 4414 if (k < 0) { 4415 StackHandleScope<1> hs(self); 4416 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4417 for (mirror::ArtMethod* mir_method : miranda_list) { 4418 vtable_mh.ChangeMethod(mir_method); 4419 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4420 miranda_method.Assign(mir_method); 4421 break; 4422 } 4423 } 4424 if (miranda_method.Get() == NULL) { 4425 // Point the interface table at a phantom slot. 4426 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 4427 if (UNLIKELY(miranda_method.Get() == NULL)) { 4428 CHECK(self->IsExceptionPending()); // OOME. 4429 return false; 4430 } 4431 // TODO: If a methods move then the miranda_list may hold stale references. 4432 miranda_list.push_back(miranda_method.Get()); 4433 } 4434 method_array->Set<false>(j, miranda_method.Get()); 4435 } 4436 } 4437 } 4438 } 4439 if (imtable_changed) { 4440 // Fill in empty entries in interface method table with conflict. 4441 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4442 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4443 if (imtable->Get(i) == NULL) { 4444 imtable->Set<false>(i, imt_conflict_method); 4445 } 4446 } 4447 klass->SetImTable(imtable.Get()); 4448 } 4449 if (!miranda_list.empty()) { 4450 int old_method_count = klass->NumVirtualMethods(); 4451 int new_method_count = old_method_count + miranda_list.size(); 4452 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4453 if (old_method_count == 0) { 4454 virtuals = AllocArtMethodArray(self, new_method_count); 4455 } else { 4456 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4457 } 4458 if (UNLIKELY(virtuals == NULL)) { 4459 CHECK(self->IsExceptionPending()); // OOME. 4460 return false; 4461 } 4462 klass->SetVirtualMethods(virtuals); 4463 4464 StackHandleScope<1> hs(self); 4465 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4466 hs.NewHandle(klass->GetVTableDuringLinking())); 4467 CHECK(vtable.Get() != NULL); 4468 int old_vtable_count = vtable->GetLength(); 4469 int new_vtable_count = old_vtable_count + miranda_list.size(); 4470 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4471 if (UNLIKELY(vtable.Get() == NULL)) { 4472 CHECK(self->IsExceptionPending()); // OOME. 4473 return false; 4474 } 4475 for (size_t i = 0; i < miranda_list.size(); ++i) { 4476 mirror::ArtMethod* method = miranda_list[i]; 4477 // Leave the declaring class alone as type indices are relative to it 4478 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4479 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4480 klass->SetVirtualMethod(old_method_count + i, method); 4481 vtable->Set<false>(old_vtable_count + i, method); 4482 } 4483 // TODO: do not assign to the vtable field until it is fully constructed. 4484 klass->SetVTable(vtable.Get()); 4485 } 4486 4487 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4488 for (int i = 0; i < vtable->GetLength(); ++i) { 4489 CHECK(vtable->Get(i) != NULL); 4490 } 4491 4492// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4493 4494 return true; 4495} 4496 4497bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4498 CHECK(klass.Get() != NULL); 4499 return LinkFields(klass, false, nullptr); 4500} 4501 4502bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass, size_t* class_size) { 4503 CHECK(klass.Get() != NULL); 4504 return LinkFields(klass, true, class_size); 4505} 4506 4507struct LinkFieldsComparator { 4508 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4509 } 4510 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4511 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4512 NO_THREAD_SAFETY_ANALYSIS { 4513 // First come reference fields, then 64-bit, and finally 32-bit 4514 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4515 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4516 if (type1 != type2) { 4517 bool is_primitive1 = type1 != Primitive::kPrimNot; 4518 bool is_primitive2 = type2 != Primitive::kPrimNot; 4519 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4520 type1 == Primitive::kPrimDouble); 4521 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4522 type2 == Primitive::kPrimDouble); 4523 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4524 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4525 if (order1 != order2) { 4526 return order1 < order2; 4527 } 4528 } 4529 // same basic group? then sort by string. 4530 return strcmp(field1->GetName(), field2->GetName()) < 0; 4531 } 4532}; 4533 4534bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static, size_t* class_size) { 4535 size_t num_fields = 4536 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4537 4538 mirror::ObjectArray<mirror::ArtField>* fields = 4539 is_static ? klass->GetSFields() : klass->GetIFields(); 4540 4541 // Initialize field_offset 4542 MemberOffset field_offset(0); 4543 if (is_static) { 4544 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 4545 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4546 // Static fields come after the embedded tables. 4547 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 4548 0, 0, 0); 4549 } 4550 field_offset = MemberOffset(base); 4551 } else { 4552 mirror::Class* super_class = klass->GetSuperClass(); 4553 if (super_class != NULL) { 4554 CHECK(super_class->IsResolved()) 4555 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4556 field_offset = MemberOffset(super_class->GetObjectSize()); 4557 } 4558 } 4559 4560 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4561 4562 // we want a relatively stable order so that adding new fields 4563 // minimizes disruption of C++ version such as Class and Method. 4564 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4565 for (size_t i = 0; i < num_fields; i++) { 4566 mirror::ArtField* f = fields->Get(i); 4567 CHECK(f != NULL) << PrettyClass(klass.Get()); 4568 grouped_and_sorted_fields.push_back(f); 4569 } 4570 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4571 LinkFieldsComparator()); 4572 4573 // References should be at the front. 4574 size_t current_field = 0; 4575 size_t num_reference_fields = 0; 4576 for (; current_field < num_fields; current_field++) { 4577 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4578 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4579 bool isPrimitive = type != Primitive::kPrimNot; 4580 if (isPrimitive) { 4581 break; // past last reference, move on to the next phase 4582 } 4583 grouped_and_sorted_fields.pop_front(); 4584 num_reference_fields++; 4585 fields->Set<false>(current_field, field); 4586 field->SetOffset(field_offset); 4587 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4588 } 4589 4590 // Now we want to pack all of the double-wide fields together. If 4591 // we're not aligned, though, we want to shuffle one 32-bit field 4592 // into place. If we can't find one, we'll have to pad it. 4593 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4594 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4595 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4596 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4597 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4598 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4599 continue; 4600 } 4601 fields->Set<false>(current_field++, field); 4602 field->SetOffset(field_offset); 4603 // drop the consumed field 4604 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4605 break; 4606 } 4607 // whether we found a 32-bit field for padding or not, we advance 4608 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4609 } 4610 4611 // Alignment is good, shuffle any double-wide fields forward, and 4612 // finish assigning field offsets to all fields. 4613 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 4614 << PrettyClass(klass.Get()); 4615 while (!grouped_and_sorted_fields.empty()) { 4616 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4617 grouped_and_sorted_fields.pop_front(); 4618 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4619 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4620 fields->Set<false>(current_field, field); 4621 field->SetOffset(field_offset); 4622 field_offset = MemberOffset(field_offset.Uint32Value() + 4623 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4624 ? sizeof(uint64_t) 4625 : sizeof(uint32_t))); 4626 current_field++; 4627 } 4628 4629 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4630 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4631 // We know there are no non-reference fields in the Reference classes, and we know 4632 // that 'referent' is alphabetically last, so this is easy... 4633 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4634 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4635 --num_reference_fields; 4636 } 4637 4638 if (kIsDebugBuild) { 4639 // Make sure that all reference fields appear before 4640 // non-reference fields, and all double-wide fields are aligned. 4641 bool seen_non_ref = false; 4642 for (size_t i = 0; i < num_fields; i++) { 4643 mirror::ArtField* field = fields->Get(i); 4644 if (false) { // enable to debug field layout 4645 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4646 << " class=" << PrettyClass(klass.Get()) 4647 << " field=" << PrettyField(field) 4648 << " offset=" 4649 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4650 } 4651 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4652 bool is_primitive = type != Primitive::kPrimNot; 4653 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4654 strcmp("referent", field->GetName()) == 0) { 4655 is_primitive = true; // We lied above, so we have to expect a lie here. 4656 } 4657 if (is_primitive) { 4658 if (!seen_non_ref) { 4659 seen_non_ref = true; 4660 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4661 } 4662 } else { 4663 DCHECK(!seen_non_ref) << PrettyField(field); 4664 } 4665 } 4666 if (!seen_non_ref) { 4667 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4668 } 4669 } 4670 4671 size_t size = field_offset.Uint32Value(); 4672 // Update klass 4673 if (is_static) { 4674 klass->SetNumReferenceStaticFields(num_reference_fields); 4675 *class_size = size; 4676 } else { 4677 klass->SetNumReferenceInstanceFields(num_reference_fields); 4678 if (!klass->IsVariableSize()) { 4679 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(); 4680 size_t previous_size = klass->GetObjectSize(); 4681 if (previous_size != 0) { 4682 // Make sure that we didn't originally have an incorrect size. 4683 CHECK_EQ(previous_size, size) << klass->GetDescriptor(); 4684 } 4685 klass->SetObjectSize(size); 4686 } 4687 } 4688 return true; 4689} 4690 4691// Set the bitmap of reference offsets, refOffsets, from the ifields 4692// list. 4693void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4694 uint32_t reference_offsets = 0; 4695 mirror::Class* super_class = klass->GetSuperClass(); 4696 if (super_class != NULL) { 4697 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4698 // If our superclass overflowed, we don't stand a chance. 4699 if (reference_offsets == CLASS_WALK_SUPER) { 4700 klass->SetReferenceInstanceOffsets(reference_offsets); 4701 return; 4702 } 4703 } 4704 CreateReferenceOffsets(klass, false, reference_offsets); 4705} 4706 4707void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4708 CreateReferenceOffsets(klass, true, 0); 4709} 4710 4711void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4712 uint32_t reference_offsets) { 4713 size_t num_reference_fields = 4714 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4715 : klass->NumReferenceInstanceFieldsDuringLinking(); 4716 mirror::ObjectArray<mirror::ArtField>* fields = 4717 is_static ? klass->GetSFields() : klass->GetIFields(); 4718 // All of the fields that contain object references are guaranteed 4719 // to be at the beginning of the fields list. 4720 for (size_t i = 0; i < num_reference_fields; ++i) { 4721 // Note that byte_offset is the offset from the beginning of 4722 // object, not the offset into instance data 4723 mirror::ArtField* field = fields->Get(i); 4724 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4725 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4726 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4727 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4728 CHECK_NE(new_bit, 0U); 4729 reference_offsets |= new_bit; 4730 } else { 4731 reference_offsets = CLASS_WALK_SUPER; 4732 break; 4733 } 4734 } 4735 // Update fields in klass 4736 if (is_static) { 4737 klass->SetReferenceStaticOffsets(reference_offsets); 4738 } else { 4739 klass->SetReferenceInstanceOffsets(reference_offsets); 4740 } 4741} 4742 4743mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4744 Handle<mirror::DexCache> dex_cache) { 4745 DCHECK(dex_cache.Get() != nullptr); 4746 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4747 if (resolved != NULL) { 4748 return resolved; 4749 } 4750 uint32_t utf16_length; 4751 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4752 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4753 dex_cache->SetResolvedString(string_idx, string); 4754 return string; 4755} 4756 4757mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4758 mirror::Class* referrer) { 4759 StackHandleScope<2> hs(Thread::Current()); 4760 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4761 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4762 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4763} 4764 4765mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4766 Handle<mirror::DexCache> dex_cache, 4767 Handle<mirror::ClassLoader> class_loader) { 4768 DCHECK(dex_cache.Get() != NULL); 4769 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4770 if (resolved == NULL) { 4771 Thread* self = Thread::Current(); 4772 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4773 resolved = FindClass(self, descriptor, class_loader); 4774 if (resolved != NULL) { 4775 // TODO: we used to throw here if resolved's class loader was not the 4776 // boot class loader. This was to permit different classes with the 4777 // same name to be loaded simultaneously by different loaders 4778 dex_cache->SetResolvedType(type_idx, resolved); 4779 } else { 4780 CHECK(self->IsExceptionPending()) 4781 << "Expected pending exception for failed resolution of: " << descriptor; 4782 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4783 StackHandleScope<1> hs(self); 4784 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4785 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4786 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4787 self->ClearException(); 4788 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4789 self->GetException(NULL)->SetCause(cause.Get()); 4790 } 4791 } 4792 } 4793 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4794 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4795 return resolved; 4796} 4797 4798mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 4799 Handle<mirror::DexCache> dex_cache, 4800 Handle<mirror::ClassLoader> class_loader, 4801 Handle<mirror::ArtMethod> referrer, 4802 InvokeType type) { 4803 DCHECK(dex_cache.Get() != NULL); 4804 // Check for hit in the dex cache. 4805 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4806 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 4807 return resolved; 4808 } 4809 // Fail, get the declaring class. 4810 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4811 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4812 if (klass == NULL) { 4813 DCHECK(Thread::Current()->IsExceptionPending()); 4814 return NULL; 4815 } 4816 // Scan using method_idx, this saves string compares but will only hit for matching dex 4817 // caches/files. 4818 switch (type) { 4819 case kDirect: // Fall-through. 4820 case kStatic: 4821 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 4822 break; 4823 case kInterface: 4824 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 4825 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4826 break; 4827 case kSuper: // Fall-through. 4828 case kVirtual: 4829 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 4830 break; 4831 default: 4832 LOG(FATAL) << "Unreachable - invocation type: " << type; 4833 } 4834 if (resolved == NULL) { 4835 // Search by name, which works across dex files. 4836 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4837 const Signature signature = dex_file.GetMethodSignature(method_id); 4838 switch (type) { 4839 case kDirect: // Fall-through. 4840 case kStatic: 4841 resolved = klass->FindDirectMethod(name, signature); 4842 break; 4843 case kInterface: 4844 resolved = klass->FindInterfaceMethod(name, signature); 4845 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4846 break; 4847 case kSuper: // Fall-through. 4848 case kVirtual: 4849 resolved = klass->FindVirtualMethod(name, signature); 4850 break; 4851 } 4852 } 4853 if (resolved != NULL) { 4854 // We found a method, check for incompatible class changes. 4855 if (resolved->CheckIncompatibleClassChange(type)) { 4856 resolved = NULL; 4857 } 4858 } 4859 if (resolved != NULL) { 4860 // Be a good citizen and update the dex cache to speed subsequent calls. 4861 dex_cache->SetResolvedMethod(method_idx, resolved); 4862 return resolved; 4863 } else { 4864 // We failed to find the method which means either an access error, an incompatible class 4865 // change, or no such method. First try to find the method among direct and virtual methods. 4866 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4867 const Signature signature = dex_file.GetMethodSignature(method_id); 4868 switch (type) { 4869 case kDirect: 4870 case kStatic: 4871 resolved = klass->FindVirtualMethod(name, signature); 4872 break; 4873 case kInterface: 4874 case kVirtual: 4875 case kSuper: 4876 resolved = klass->FindDirectMethod(name, signature); 4877 break; 4878 } 4879 4880 // If we found something, check that it can be accessed by the referrer. 4881 if (resolved != NULL && referrer.Get() != NULL) { 4882 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4883 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4884 if (!referring_class->CanAccess(methods_class)) { 4885 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4886 resolved, type); 4887 return NULL; 4888 } else if (!referring_class->CanAccessMember(methods_class, 4889 resolved->GetAccessFlags())) { 4890 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4891 return NULL; 4892 } 4893 } 4894 4895 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4896 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4897 switch (type) { 4898 case kDirect: 4899 case kStatic: 4900 if (resolved != NULL) { 4901 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4902 } else { 4903 resolved = klass->FindInterfaceMethod(name, signature); 4904 if (resolved != NULL) { 4905 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4906 } else { 4907 ThrowNoSuchMethodError(type, klass, name, signature); 4908 } 4909 } 4910 break; 4911 case kInterface: 4912 if (resolved != NULL) { 4913 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4914 } else { 4915 resolved = klass->FindVirtualMethod(name, signature); 4916 if (resolved != NULL) { 4917 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4918 } else { 4919 ThrowNoSuchMethodError(type, klass, name, signature); 4920 } 4921 } 4922 break; 4923 case kSuper: 4924 ThrowNoSuchMethodError(type, klass, name, signature); 4925 break; 4926 case kVirtual: 4927 if (resolved != NULL) { 4928 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4929 } else { 4930 resolved = klass->FindInterfaceMethod(name, signature); 4931 if (resolved != NULL) { 4932 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4933 } else { 4934 ThrowNoSuchMethodError(type, klass, name, signature); 4935 } 4936 } 4937 break; 4938 } 4939 DCHECK(Thread::Current()->IsExceptionPending()); 4940 return NULL; 4941 } 4942} 4943 4944mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4945 Handle<mirror::DexCache> dex_cache, 4946 Handle<mirror::ClassLoader> class_loader, 4947 bool is_static) { 4948 DCHECK(dex_cache.Get() != nullptr); 4949 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4950 if (resolved != NULL) { 4951 return resolved; 4952 } 4953 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4954 Thread* const self = Thread::Current(); 4955 StackHandleScope<1> hs(self); 4956 Handle<mirror::Class> klass( 4957 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4958 if (klass.Get() == NULL) { 4959 DCHECK(Thread::Current()->IsExceptionPending()); 4960 return NULL; 4961 } 4962 4963 if (is_static) { 4964 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 4965 } else { 4966 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 4967 } 4968 4969 if (resolved == NULL) { 4970 const char* name = dex_file.GetFieldName(field_id); 4971 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4972 if (is_static) { 4973 resolved = mirror::Class::FindStaticField(self, klass, name, type); 4974 } else { 4975 resolved = klass->FindInstanceField(name, type); 4976 } 4977 if (resolved == NULL) { 4978 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 4979 return NULL; 4980 } 4981 } 4982 dex_cache->SetResolvedField(field_idx, resolved); 4983 return resolved; 4984} 4985 4986mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4987 uint32_t field_idx, 4988 Handle<mirror::DexCache> dex_cache, 4989 Handle<mirror::ClassLoader> class_loader) { 4990 DCHECK(dex_cache.Get() != nullptr); 4991 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4992 if (resolved != NULL) { 4993 return resolved; 4994 } 4995 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4996 Thread* self = Thread::Current(); 4997 StackHandleScope<1> hs(self); 4998 Handle<mirror::Class> klass( 4999 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5000 if (klass.Get() == NULL) { 5001 DCHECK(Thread::Current()->IsExceptionPending()); 5002 return NULL; 5003 } 5004 5005 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5006 StringPiece type(dex_file.StringDataByIdx( 5007 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5008 resolved = mirror::Class::FindField(self, klass, name, type); 5009 if (resolved != NULL) { 5010 dex_cache->SetResolvedField(field_idx, resolved); 5011 } else { 5012 ThrowNoSuchFieldError("", klass.Get(), type, name); 5013 } 5014 return resolved; 5015} 5016 5017const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5018 uint32_t* length) { 5019 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5020 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5021 const DexFile& dex_file = *dex_cache->GetDexFile(); 5022 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5023 return dex_file.GetMethodShorty(method_id, length); 5024} 5025 5026void ClassLinker::DumpAllClasses(int flags) { 5027 if (dex_cache_image_class_lookup_required_) { 5028 MoveImageClassesToClassTable(); 5029 } 5030 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5031 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5032 std::vector<mirror::Class*> all_classes; 5033 { 5034 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5035 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5036 mirror::Class* klass = it.second.Read(); 5037 all_classes.push_back(klass); 5038 } 5039 } 5040 5041 for (size_t i = 0; i < all_classes.size(); ++i) { 5042 all_classes[i]->DumpClass(std::cerr, flags); 5043 } 5044} 5045 5046void ClassLinker::DumpForSigQuit(std::ostream& os) { 5047 if (dex_cache_image_class_lookup_required_) { 5048 MoveImageClassesToClassTable(); 5049 } 5050 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5051 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5052} 5053 5054size_t ClassLinker::NumLoadedClasses() { 5055 if (dex_cache_image_class_lookup_required_) { 5056 MoveImageClassesToClassTable(); 5057 } 5058 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5059 return class_table_.size(); 5060} 5061 5062pid_t ClassLinker::GetClassesLockOwner() { 5063 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5064} 5065 5066pid_t ClassLinker::GetDexLockOwner() { 5067 return dex_lock_.GetExclusiveOwnerTid(); 5068} 5069 5070void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5071 DCHECK(!init_done_); 5072 5073 DCHECK(klass != NULL); 5074 DCHECK(klass->GetClassLoader() == NULL); 5075 5076 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5077 DCHECK(class_roots != NULL); 5078 DCHECK(class_roots->Get(class_root) == NULL); 5079 class_roots->Set<false>(class_root, klass); 5080} 5081 5082} // namespace art 5083