class_linker.cc revision 67ef46adfb2c4990832e23aebeb9c0582d8519c4
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 <deque> 20#include <memory> 21#include <string> 22#include <utility> 23#include <vector> 24 25#include "base/casts.h" 26#include "base/logging.h" 27#include "base/scoped_flock.h" 28#include "base/stl_util.h" 29#include "base/unix_file/fd_file.h" 30#include "class_linker-inl.h" 31#include "compiler_callbacks.h" 32#include "debugger.h" 33#include "dex_file-inl.h" 34#include "gc_root-inl.h" 35#include "gc/accounting/card_table-inl.h" 36#include "gc/accounting/heap_bitmap.h" 37#include "gc/heap.h" 38#include "gc/space/image_space.h" 39#include "handle_scope.h" 40#include "intern_table.h" 41#include "interpreter/interpreter.h" 42#include "leb128.h" 43#include "method_helper-inl.h" 44#include "oat.h" 45#include "oat_file.h" 46#include "object_lock.h" 47#include "mirror/art_field-inl.h" 48#include "mirror/art_method-inl.h" 49#include "mirror/class.h" 50#include "mirror/class-inl.h" 51#include "mirror/class_loader.h" 52#include "mirror/dex_cache-inl.h" 53#include "mirror/iftable-inl.h" 54#include "mirror/object-inl.h" 55#include "mirror/object_array-inl.h" 56#include "mirror/proxy.h" 57#include "mirror/reference-inl.h" 58#include "mirror/stack_trace_element.h" 59#include "mirror/string-inl.h" 60#include "os.h" 61#include "runtime.h" 62#include "entrypoints/entrypoint_utils.h" 63#include "ScopedLocalRef.h" 64#include "scoped_thread_state_change.h" 65#include "handle_scope-inl.h" 66#include "thread.h" 67#include "utils.h" 68#include "verifier/method_verifier.h" 69#include "well_known_classes.h" 70 71namespace art { 72 73static void ThrowNoClassDefFoundError(const char* fmt, ...) 74 __attribute__((__format__(__printf__, 1, 2))) 75 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 76static void ThrowNoClassDefFoundError(const char* fmt, ...) { 77 va_list args; 78 va_start(args, fmt); 79 Thread* self = Thread::Current(); 80 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 81 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 82 va_end(args); 83} 84 85static void ThrowEarlierClassFailure(mirror::Class* c) 86 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 87 // The class failed to initialize on a previous attempt, so we want to throw 88 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 89 // failed in verification, in which case v2 5.4.1 says we need to re-throw 90 // the previous error. 91 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 92 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 93 } 94 95 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 96 Thread* self = Thread::Current(); 97 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 98 if (c->GetVerifyErrorClass() != NULL) { 99 // TODO: change the verifier to store an _instance_, with a useful detail message? 100 std::string temp; 101 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 102 PrettyDescriptor(c).c_str()); 103 } else { 104 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 105 PrettyDescriptor(c).c_str()); 106 } 107} 108 109static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 110 Thread* self = Thread::Current(); 111 JNIEnv* env = self->GetJniEnv(); 112 113 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 114 CHECK(cause.get() != NULL); 115 116 env->ExceptionClear(); 117 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 118 env->Throw(cause.get()); 119 120 // We only wrap non-Error exceptions; an Error can just be used as-is. 121 if (!is_error) { 122 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 123 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 124 } 125} 126 127static size_t Hash(const char* s) { 128 // This is the java.lang.String hashcode for convenience, not interoperability. 129 size_t hash = 0; 130 for (; *s != '\0'; ++s) { 131 hash = hash * 31 + *s; 132 } 133 return hash; 134} 135 136const char* ClassLinker::class_roots_descriptors_[] = { 137 "Ljava/lang/Class;", 138 "Ljava/lang/Object;", 139 "[Ljava/lang/Class;", 140 "[Ljava/lang/Object;", 141 "Ljava/lang/String;", 142 "Ljava/lang/DexCache;", 143 "Ljava/lang/ref/Reference;", 144 "Ljava/lang/reflect/ArtField;", 145 "Ljava/lang/reflect/ArtMethod;", 146 "Ljava/lang/reflect/Proxy;", 147 "[Ljava/lang/String;", 148 "[Ljava/lang/reflect/ArtField;", 149 "[Ljava/lang/reflect/ArtMethod;", 150 "Ljava/lang/ClassLoader;", 151 "Ljava/lang/Throwable;", 152 "Ljava/lang/ClassNotFoundException;", 153 "Ljava/lang/StackTraceElement;", 154 "Z", 155 "B", 156 "C", 157 "D", 158 "F", 159 "I", 160 "J", 161 "S", 162 "V", 163 "[Z", 164 "[B", 165 "[C", 166 "[D", 167 "[F", 168 "[I", 169 "[J", 170 "[S", 171 "[Ljava/lang/StackTraceElement;", 172}; 173 174ClassLinker::ClassLinker(InternTable* intern_table) 175 // dex_lock_ is recursive as it may be used in stack dumping. 176 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 177 dex_cache_image_class_lookup_required_(false), 178 failed_dex_cache_class_lookups_(0), 179 class_roots_(nullptr), 180 array_iftable_(nullptr), 181 find_array_class_cache_next_victim_(0), 182 init_done_(false), 183 log_new_dex_caches_roots_(false), 184 log_new_class_table_roots_(false), 185 intern_table_(intern_table), 186 portable_resolution_trampoline_(nullptr), 187 quick_resolution_trampoline_(nullptr), 188 portable_imt_conflict_trampoline_(nullptr), 189 quick_imt_conflict_trampoline_(nullptr), 190 quick_generic_jni_trampoline_(nullptr), 191 quick_to_interpreter_bridge_trampoline_(nullptr) { 192 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 193 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 194} 195 196// To set a value for generic JNI. May be necessary in compiler tests. 197extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 198 199void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 200 VLOG(startup) << "ClassLinker::Init"; 201 CHECK(Runtime::Current()->IsCompiler()); 202 203 CHECK(!init_done_); 204 205 // java_lang_Class comes first, it's needed for AllocClass 206 Thread* self = Thread::Current(); 207 gc::Heap* heap = Runtime::Current()->GetHeap(); 208 // The GC can't handle an object with a null class since we can't get the size of this object. 209 heap->IncrementDisableMovingGC(self); 210 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 211 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 212 heap->AllocNonMovableObject<true>(self, nullptr, 213 mirror::Class::ClassClassSize(), 214 VoidFunctor())))); 215 CHECK(java_lang_Class.Get() != NULL); 216 mirror::Class::SetClassClass(java_lang_Class.Get()); 217 java_lang_Class->SetClass(java_lang_Class.Get()); 218 if (kUseBakerOrBrooksReadBarrier) { 219 java_lang_Class->AssertReadBarrierPointer(); 220 } 221 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 222 heap->DecrementDisableMovingGC(self); 223 // AllocClass(mirror::Class*) can now be used 224 225 // Class[] is used for reflection support. 226 Handle<mirror::Class> class_array_class(hs.NewHandle( 227 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 228 class_array_class->SetComponentType(java_lang_Class.Get()); 229 230 // java_lang_Object comes next so that object_array_class can be created. 231 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 232 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 233 CHECK(java_lang_Object.Get() != NULL); 234 // backfill Object as the super class of Class. 235 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 236 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 237 238 // Object[] next to hold class roots. 239 Handle<mirror::Class> object_array_class(hs.NewHandle( 240 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 241 object_array_class->SetComponentType(java_lang_Object.Get()); 242 243 // Setup the char (primitive) class to be used for char[]. 244 Handle<mirror::Class> char_class(hs.NewHandle( 245 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 246 247 // Setup the char[] class to be used for String. 248 Handle<mirror::Class> char_array_class(hs.NewHandle( 249 AllocClass(self, java_lang_Class.Get(), 250 mirror::Array::ClassSize()))); 251 char_array_class->SetComponentType(char_class.Get()); 252 mirror::CharArray::SetArrayClass(char_array_class.Get()); 253 254 // Setup String. 255 Handle<mirror::Class> java_lang_String(hs.NewHandle( 256 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 257 mirror::String::SetClass(java_lang_String.Get()); 258 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 259 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 260 261 // Setup Reference. 262 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 263 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 264 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 265 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 266 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 267 268 // Create storage for root classes, save away our work so far (requires descriptors). 269 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 270 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 271 kClassRootsMax)); 272 CHECK(!class_roots_.IsNull()); 273 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 274 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 275 SetClassRoot(kClassArrayClass, class_array_class.Get()); 276 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 277 SetClassRoot(kCharArrayClass, char_array_class.Get()); 278 SetClassRoot(kJavaLangString, java_lang_String.Get()); 279 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 280 281 // Setup the primitive type classes. 282 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 283 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 284 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 285 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 286 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 287 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 288 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 289 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 290 291 // Create array interface entries to populate once we can load system classes. 292 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 293 294 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 295 Handle<mirror::Class> int_array_class(hs.NewHandle( 296 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 297 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 298 mirror::IntArray::SetArrayClass(int_array_class.Get()); 299 SetClassRoot(kIntArrayClass, int_array_class.Get()); 300 301 // now that these are registered, we can use AllocClass() and AllocObjectArray 302 303 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 304 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 305 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 306 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 307 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 308 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 309 310 // Constructor, Field, Method, and AbstractMethod are necessary so 311 // that FindClass can link members. 312 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 313 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 314 CHECK(java_lang_reflect_ArtField.Get() != NULL); 315 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 316 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 317 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 318 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 319 320 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 321 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 322 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 323 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 324 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 325 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 326 327 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 328 329 // Set up array classes for string, field, method 330 Handle<mirror::Class> object_array_string(hs.NewHandle( 331 AllocClass(self, java_lang_Class.Get(), 332 mirror::ObjectArray<mirror::String>::ClassSize()))); 333 object_array_string->SetComponentType(java_lang_String.Get()); 334 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 335 336 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 337 AllocClass(self, java_lang_Class.Get(), 338 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 339 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 340 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 341 342 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 343 AllocClass(self, java_lang_Class.Get(), 344 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 345 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 346 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 347 348 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 349 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 350 // these roots. 351 CHECK_NE(0U, boot_class_path.size()); 352 for (size_t i = 0; i != boot_class_path.size(); ++i) { 353 const DexFile* dex_file = boot_class_path[i]; 354 CHECK(dex_file != NULL); 355 AppendToBootClassPath(*dex_file); 356 } 357 358 // now we can use FindSystemClass 359 360 // run char class through InitializePrimitiveClass to finish init 361 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 362 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 363 364 // Create runtime resolution and imt conflict methods. Also setup the default imt. 365 Runtime* runtime = Runtime::Current(); 366 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 367 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 368 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 369 370 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 371 // we do not need friend classes or a publicly exposed setter. 372 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 373 374 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 375 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 376 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 377 CHECK_EQ(java_lang_Object.Get(), Object_class); 378 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 379 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 380 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 381 std::ostringstream os1, os2; 382 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 383 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 384 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 385 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 386 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 387 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 388 CHECK_EQ(java_lang_String.Get(), String_class); 389 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 390 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 391 392 // Setup the primitive array type classes - can't be done until Object has a vtable. 393 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 394 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 395 396 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 397 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 398 399 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 400 CHECK_EQ(char_array_class.Get(), found_char_array_class); 401 402 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 403 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 404 405 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 406 CHECK_EQ(int_array_class.Get(), found_int_array_class); 407 408 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 409 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 410 411 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 412 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 413 414 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 415 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 416 417 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 418 CHECK_EQ(class_array_class.Get(), found_class_array_class); 419 420 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 421 CHECK_EQ(object_array_class.Get(), found_object_array_class); 422 423 // Setup the single, global copy of "iftable". 424 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 425 CHECK(java_lang_Cloneable != NULL); 426 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 427 CHECK(java_io_Serializable != NULL); 428 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 429 // crawl up and explicitly list all of the supers as well. 430 { 431 mirror::IfTable* array_iftable = array_iftable_.Read(); 432 array_iftable->SetInterface(0, java_lang_Cloneable); 433 array_iftable->SetInterface(1, java_io_Serializable); 434 } 435 436 // Sanity check Class[] and Object[]'s interfaces. 437 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 438 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 439 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 440 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 441 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 442 // dex_cache_ fields and register them in class_table_. 443 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 444 CHECK_EQ(java_lang_Class.Get(), Class_class); 445 446 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 447 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 448 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 449 450 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 451 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 452 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 453 454 mirror::Class* String_array_class = 455 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 456 CHECK_EQ(object_array_string.Get(), String_array_class); 457 458 mirror::Class* Art_method_array_class = 459 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 460 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 461 462 mirror::Class* Art_field_array_class = 463 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 464 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 465 466 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 467 468 // Create java.lang.reflect.Proxy root. 469 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 470 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 471 472 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 473 // finish initializing Reference class 474 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 475 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 476 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 477 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 478 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 479 mirror::Class* java_lang_ref_FinalizerReference = 480 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 481 java_lang_ref_FinalizerReference->SetAccessFlags( 482 java_lang_ref_FinalizerReference->GetAccessFlags() | 483 kAccClassIsReference | kAccClassIsFinalizerReference); 484 mirror::Class* java_lang_ref_PhantomReference = 485 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 486 java_lang_ref_PhantomReference->SetAccessFlags( 487 java_lang_ref_PhantomReference->GetAccessFlags() | 488 kAccClassIsReference | kAccClassIsPhantomReference); 489 mirror::Class* java_lang_ref_SoftReference = 490 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 491 java_lang_ref_SoftReference->SetAccessFlags( 492 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 493 mirror::Class* java_lang_ref_WeakReference = 494 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 495 java_lang_ref_WeakReference->SetAccessFlags( 496 java_lang_ref_WeakReference->GetAccessFlags() | 497 kAccClassIsReference | kAccClassIsWeakReference); 498 499 // Setup the ClassLoader, verifying the object_size_. 500 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 501 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 502 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 503 504 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 505 // java.lang.StackTraceElement as a convenience. 506 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 507 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 508 SetClassRoot(kJavaLangClassNotFoundException, 509 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 510 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 511 SetClassRoot(kJavaLangStackTraceElementArrayClass, 512 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 513 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 514 515 FinishInit(self); 516 517 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 518} 519 520void ClassLinker::FinishInit(Thread* self) { 521 VLOG(startup) << "ClassLinker::FinishInit entering"; 522 523 // Let the heap know some key offsets into java.lang.ref instances 524 // Note: we hard code the field indexes here rather than using FindInstanceField 525 // as the types of the field can't be resolved prior to the runtime being 526 // fully initialized 527 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 528 mirror::Class* java_lang_ref_FinalizerReference = 529 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 530 531 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 532 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 533 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 534 535 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 536 CHECK_STREQ(queue->GetName(), "queue"); 537 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 538 539 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 540 CHECK_STREQ(queueNext->GetName(), "queueNext"); 541 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 542 543 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 544 CHECK_STREQ(referent->GetName(), "referent"); 545 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 546 547 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 548 CHECK_STREQ(zombie->GetName(), "zombie"); 549 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 550 551 // ensure all class_roots_ are initialized 552 for (size_t i = 0; i < kClassRootsMax; i++) { 553 ClassRoot class_root = static_cast<ClassRoot>(i); 554 mirror::Class* klass = GetClassRoot(class_root); 555 CHECK(klass != NULL); 556 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 557 // note SetClassRoot does additional validation. 558 // if possible add new checks there to catch errors early 559 } 560 561 CHECK(!array_iftable_.IsNull()); 562 563 // disable the slow paths in FindClass and CreatePrimitiveClass now 564 // that Object, Class, and Object[] are setup 565 init_done_ = true; 566 567 VLOG(startup) << "ClassLinker::FinishInit exiting"; 568} 569 570void ClassLinker::RunRootClinits() { 571 Thread* self = Thread::Current(); 572 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 573 mirror::Class* c = GetClassRoot(ClassRoot(i)); 574 if (!c->IsArrayClass() && !c->IsPrimitive()) { 575 StackHandleScope<1> hs(self); 576 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 577 EnsureInitialized(h_class, true, true); 578 self->AssertNoPendingException(); 579 } 580 } 581} 582 583bool ClassLinker::GenerateOatFile(const char* dex_filename, 584 int oat_fd, 585 const char* oat_cache_filename, 586 std::string* error_msg) { 587 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 588 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 589 590 gc::Heap* heap = Runtime::Current()->GetHeap(); 591 std::string boot_image_option("--boot-image="); 592 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 593 594 std::string dex_file_option("--dex-file="); 595 dex_file_option += dex_filename; 596 597 std::string oat_fd_option("--oat-fd="); 598 StringAppendF(&oat_fd_option, "%d", oat_fd); 599 600 std::string oat_location_option("--oat-location="); 601 oat_location_option += oat_cache_filename; 602 603 std::vector<std::string> argv; 604 argv.push_back(dex2oat); 605 argv.push_back("--runtime-arg"); 606 argv.push_back("-classpath"); 607 argv.push_back("--runtime-arg"); 608 argv.push_back(Runtime::Current()->GetClassPathString()); 609 610 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 611 612 if (!Runtime::Current()->IsVerificationEnabled()) { 613 argv.push_back("--compiler-filter=verify-none"); 614 } 615 616 if (Runtime::Current()->MustRelocateIfPossible()) { 617 argv.push_back("--runtime-arg"); 618 argv.push_back("-Xrelocate"); 619 } else { 620 argv.push_back("--runtime-arg"); 621 argv.push_back("-Xnorelocate"); 622 } 623 624 if (!kIsTargetBuild) { 625 argv.push_back("--host"); 626 } 627 628 argv.push_back(boot_image_option); 629 argv.push_back(dex_file_option); 630 argv.push_back(oat_fd_option); 631 argv.push_back(oat_location_option); 632 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 633 for (size_t i = 0; i < compiler_options.size(); ++i) { 634 argv.push_back(compiler_options[i].c_str()); 635 } 636 637 return Exec(argv, error_msg); 638} 639 640const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 641 WriterMutexLock mu(Thread::Current(), dex_lock_); 642 if (kIsDebugBuild) { 643 for (size_t i = 0; i < oat_files_.size(); ++i) { 644 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 645 } 646 } 647 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 648 oat_files_.push_back(oat_file); 649 return oat_file; 650} 651 652OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 653 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 654 OatFile* oat_file = space->ReleaseOatFile(); 655 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 656 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 657 return *oat_file; 658} 659 660const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 661 const char* dex_location = dex_file.GetLocation().c_str(); 662 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 663 return FindOpenedOatFile(nullptr, dex_location, &dex_location_checksum); 664} 665 666const OatFile* ClassLinker::FindOpenedOatFile(const char* oat_location, const char* dex_location, 667 const uint32_t* const dex_location_checksum) { 668 ReaderMutexLock mu(Thread::Current(), dex_lock_); 669 for (size_t i = 0; i < oat_files_.size(); i++) { 670 const OatFile* oat_file = oat_files_[i]; 671 DCHECK(oat_file != NULL); 672 673 if (oat_location != nullptr) { 674 if (oat_file->GetLocation() != oat_location) { 675 continue; 676 } 677 } 678 679 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 680 dex_location_checksum, 681 false); 682 if (oat_dex_file != NULL) { 683 return oat_file; 684 } 685 } 686 return NULL; 687} 688 689static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, const char* dex_location, 690 bool generated, 691 std::vector<std::string>* error_msgs, 692 std::vector<const DexFile*>* dex_files) { 693 if (oat_file == nullptr) { 694 return false; 695 } 696 697 size_t old_size = dex_files->size(); // To rollback on error. 698 699 bool success = true; 700 for (size_t i = 0; success; ++i) { 701 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 702 const char* next_name = next_name_str.c_str(); 703 704 uint32_t dex_location_checksum; 705 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 706 std::string error_msg; 707 if (!DexFile::GetChecksum(next_name, dex_location_checksum_pointer, &error_msg)) { 708 DCHECK_EQ(false, i == 0 && generated); 709 dex_location_checksum_pointer = nullptr; 710 } 711 712 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 713 714 if (oat_dex_file == nullptr) { 715 if (i == 0 && generated) { 716 std::string error_msg; 717 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 718 " file'%s'", dex_location, dex_location_checksum, 719 oat_file->GetLocation().c_str()); 720 error_msgs->push_back(error_msg); 721 } 722 break; // Not found, done. 723 } 724 725 // Checksum test. Test must succeed when generated. 726 success = !generated; 727 if (dex_location_checksum_pointer != nullptr) { 728 success = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 729 } 730 731 if (success) { 732 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 733 if (dex_file == nullptr) { 734 success = false; 735 error_msgs->push_back(error_msg); 736 } else { 737 dex_files->push_back(dex_file); 738 } 739 } 740 741 // When we generated the file, we expect success, or something is terribly wrong. 742 CHECK_EQ(false, generated && !success) 743 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 744 << std::hex << " dex_location_checksum=" << dex_location_checksum 745 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 746 } 747 748 if (dex_files->size() == old_size) { 749 success = false; // We did not even find classes.dex 750 } 751 752 if (success) { 753 return true; 754 } else { 755 // Free all the dex files we have loaded. 756 auto it = dex_files->begin() + old_size; 757 auto it_end = dex_files->end(); 758 for (; it != it_end; it++) { 759 delete *it; 760 } 761 dex_files->erase(dex_files->begin() + old_size, it_end); 762 763 return false; 764 } 765} 766 767// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 768// complicates the loading process, as we should not use an iterative loading process, because that 769// would register the oat file and dex files that come before the broken one. Instead, check all 770// multidex ahead of time. 771bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 772 std::vector<std::string>* error_msgs, 773 std::vector<const DexFile*>* dex_files) { 774 // 1) Check whether we have an open oat file. 775 // This requires a dex checksum, use the "primary" one. 776 uint32_t dex_location_checksum; 777 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 778 bool have_checksum = true; 779 std::string checksum_error_msg; 780 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 781 dex_location_checksum_pointer = nullptr; 782 have_checksum = false; 783 } 784 785 bool needs_registering = false; 786 787 std::unique_ptr<const OatFile> open_oat_file(FindOpenedOatFile(oat_location, dex_location, 788 dex_location_checksum_pointer)); 789 790 // 2) If we do not have an open one, maybe there's one on disk already. 791 792 // In case the oat file is not open, we play a locking game here so 793 // that if two different processes race to load and register or generate 794 // (or worse, one tries to open a partial generated file) we will be okay. 795 // This is actually common with apps that use DexClassLoader to work 796 // around the dex method reference limit and that have a background 797 // service running in a separate process. 798 ScopedFlock scoped_flock; 799 800 if (open_oat_file.get() == nullptr) { 801 if (oat_location != nullptr) { 802 // Can only do this if we have a checksum, else error. 803 if (!have_checksum) { 804 error_msgs->push_back(checksum_error_msg); 805 return false; 806 } 807 808 std::string error_msg; 809 810 // We are loading or creating one in the future. Time to set up the file lock. 811 if (!scoped_flock.Init(oat_location, &error_msg)) { 812 error_msgs->push_back(error_msg); 813 return false; 814 } 815 816 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 817 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 818 oat_location, &error_msg)); 819 820 if (open_oat_file.get() == nullptr) { 821 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 822 dex_location, oat_location, error_msg.c_str()); 823 VLOG(class_linker) << compound_msg; 824 error_msgs->push_back(compound_msg); 825 } 826 } else { 827 // TODO: What to lock here? 828 bool obsolete_file_cleanup_failed; 829 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 830 dex_location_checksum_pointer, 831 kRuntimeISA, error_msgs, 832 &obsolete_file_cleanup_failed)); 833 // There's no point in going forward and eventually try to regenerate the 834 // file if we couldn't remove the obsolete one. Mostly likely we will fail 835 // with the same error when trying to write the new file. 836 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 837 if (obsolete_file_cleanup_failed) { 838 return false; 839 } 840 } 841 needs_registering = true; 842 } 843 844 // 3) If we have an oat file, check all contained multidex files for our dex_location. 845 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 846 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, false, error_msgs, 847 dex_files); 848 if (success) { 849 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 850 if (needs_registering) { 851 // We opened the oat file, so we must register it. 852 RegisterOatFile(oat_file); 853 } 854 // If the file isn't executable we failed patchoat but did manage to get the dex files. 855 return oat_file->IsExecutable(); 856 } else { 857 if (needs_registering) { 858 // We opened it, delete it. 859 open_oat_file.reset(); 860 } else { 861 open_oat_file.release(); // Do not delete open oat files. 862 } 863 } 864 865 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 866 867 // Need a checksum, fail else. 868 if (!have_checksum) { 869 error_msgs->push_back(checksum_error_msg); 870 return false; 871 } 872 873 // Look in cache location if no oat_location is given. 874 std::string cache_location; 875 if (oat_location == nullptr) { 876 // Use the dalvik cache. 877 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 878 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 879 oat_location = cache_location.c_str(); 880 } 881 882 // Definitely need to lock now. 883 if (!scoped_flock.HasFile()) { 884 std::string error_msg; 885 if (!scoped_flock.Init(oat_location, &error_msg)) { 886 error_msgs->push_back(error_msg); 887 return false; 888 } 889 } 890 891 if (Runtime::Current()->IsDex2OatEnabled()) { 892 // Create the oat file. 893 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 894 oat_location, error_msgs)); 895 } 896 897 // Failed, bail. 898 if (open_oat_file.get() == nullptr) { 899 std::string error_msg; 900 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 901 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 902 error_msgs->push_back(error_msg); 903 return false; 904 } 905 906 // Try to load again, but stronger checks. 907 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, true, error_msgs, 908 dex_files); 909 if (success) { 910 RegisterOatFile(open_oat_file.release()); 911 return true; 912 } else { 913 return false; 914 } 915} 916 917const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 918 uint32_t dex_location_checksum, 919 const char* oat_location, 920 std::string* error_msg) { 921 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 922 !Runtime::Current()->IsCompiler(), 923 error_msg)); 924 if (oat_file.get() == nullptr) { 925 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 926 error_msg->c_str()); 927 return nullptr; 928 } 929 Runtime* runtime = Runtime::Current(); 930 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 931 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 932 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 933 if (expected_image_oat_checksum != actual_image_oat_checksum) { 934 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 935 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 936 actual_image_oat_checksum); 937 return nullptr; 938 } 939 940 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 941 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 942 if (expected_image_oat_offset != actual_image_oat_offset) { 943 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 944 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 945 actual_image_oat_offset); 946 return nullptr; 947 } 948 int32_t expected_patch_delta = image_header.GetPatchDelta(); 949 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 950 if (expected_patch_delta != actual_patch_delta) { 951 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 952 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 953 return nullptr; 954 } 955 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 956 &dex_location_checksum); 957 if (oat_dex_file == nullptr) { 958 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 959 dex_location); 960 return nullptr; 961 } 962 uint32_t expected_dex_checksum = dex_location_checksum; 963 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 964 if (expected_dex_checksum != actual_dex_checksum) { 965 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 966 "found 0x%x", oat_location, expected_dex_checksum, 967 actual_dex_checksum); 968 return nullptr; 969 } 970 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 971 if (dex_file.get() != nullptr) { 972 return oat_file.release(); 973 } else { 974 return nullptr; 975 } 976} 977 978const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 979 int fd, const char* oat_location, 980 std::vector<std::string>* error_msgs) { 981 // Generate the output oat file for the dex file 982 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 983 std::string error_msg; 984 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 985 CHECK(!error_msg.empty()); 986 error_msgs->push_back(error_msg); 987 return nullptr; 988 } 989 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 990 !Runtime::Current()->IsCompiler(), 991 &error_msg)); 992 if (oat_file.get() == nullptr) { 993 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 994 oat_location, error_msg.c_str()); 995 error_msgs->push_back(compound_msg); 996 return nullptr; 997 } 998 999 return oat_file.release(); 1000} 1001 1002bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1003 const InstructionSet instruction_set) { 1004 Runtime* runtime = Runtime::Current(); 1005 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1006 uint32_t image_oat_checksum = 0; 1007 if (instruction_set == kRuntimeISA) { 1008 const ImageHeader& image_header = image_space->GetImageHeader(); 1009 image_oat_checksum = image_header.GetOatChecksum(); 1010 } else { 1011 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1012 image_space->GetImageLocation().c_str(), instruction_set)); 1013 image_oat_checksum = image_header->GetOatChecksum(); 1014 } 1015 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1016} 1017 1018bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1019 const InstructionSet instruction_set, 1020 std::string* error_msg) { 1021 Runtime* runtime = Runtime::Current(); 1022 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1023 1024 // If the requested instruction set is the same as the current runtime, 1025 // we can use the checksums directly. If it isn't, we'll have to read the 1026 // image header from the image for the right instruction set. 1027 uint32_t image_oat_checksum = 0; 1028 uintptr_t image_oat_data_begin = 0; 1029 int32_t image_patch_delta = 0; 1030 if (instruction_set == Runtime::Current()->GetInstructionSet()) { 1031 const ImageHeader& image_header = image_space->GetImageHeader(); 1032 image_oat_checksum = image_header.GetOatChecksum(); 1033 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1034 image_patch_delta = image_header.GetPatchDelta(); 1035 } else { 1036 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1037 image_space->GetImageLocation().c_str(), instruction_set)); 1038 image_oat_checksum = image_header->GetOatChecksum(); 1039 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1040 image_patch_delta = image_header->GetPatchDelta(); 1041 } 1042 const OatHeader& oat_header = oat_file->GetOatHeader(); 1043 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1044 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1045 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1046 if (!ret) { 1047 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1048 oat_file->GetLocation().c_str(), 1049 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1050 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1051 oat_file->GetOatHeader().GetImagePatchDelta(), 1052 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1053 } 1054 return ret; 1055} 1056 1057bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1058 const char* dex_location, 1059 uint32_t dex_location_checksum, 1060 const InstructionSet instruction_set, 1061 std::string* error_msg) { 1062 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1063 return false; 1064 } 1065 1066 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1067 &dex_location_checksum); 1068 if (oat_dex_file == NULL) { 1069 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1070 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1071 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 1072 for (size_t i = 0; i < oat_dex_files.size(); i++) { 1073 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 1074 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 1075 oat_file->GetLocation().c_str(), 1076 oat_dex_file->GetDexFileLocation().c_str()); 1077 } 1078 return false; 1079 } 1080 1081 if (dex_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) { 1082 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1083 oat_file->GetLocation().c_str(), 1084 oat_dex_file->GetDexFileLocationChecksum(), 1085 dex_location, dex_location_checksum); 1086 return false; 1087 } 1088 return true; 1089} 1090 1091bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1092 const char* dex_location, 1093 std::string* error_msg) { 1094 CHECK(oat_file != nullptr); 1095 CHECK(dex_location != nullptr); 1096 std::unique_ptr<const DexFile> dex_file; 1097 uint32_t dex_location_checksum; 1098 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 1099 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1100 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1101 // directory. 1102 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1103 if (oat_dex_file == nullptr) { 1104 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1105 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1106 error_msg->c_str()); 1107 return false; 1108 } 1109 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1110 } else { 1111 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, dex_location_checksum, 1112 kRuntimeISA, error_msg); 1113 if (!verified) { 1114 return false; 1115 } 1116 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1117 &dex_location_checksum)->OpenDexFile(error_msg)); 1118 } 1119 return dex_file.get() != nullptr; 1120} 1121 1122const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1123 const char* dex_location, 1124 const uint32_t* const dex_location_checksum, 1125 InstructionSet isa, 1126 std::vector<std::string>* error_msgs, 1127 bool* obsolete_file_cleanup_failed) { 1128 *obsolete_file_cleanup_failed = false; 1129 bool already_opened = false; 1130 std::string dex_location_str(dex_location); 1131 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1132 &already_opened, 1133 obsolete_file_cleanup_failed, 1134 error_msgs)); 1135 std::string error_msg; 1136 if (oat_file.get() == nullptr) { 1137 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1138 dex_location)); 1139 return nullptr; 1140 } else if (oat_file->IsExecutable() && 1141 !VerifyOatWithDexFile(oat_file.get(), dex_location, &error_msg)) { 1142 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1143 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1144 error_msg.c_str())); 1145 return nullptr; 1146 } else if (!oat_file->IsExecutable() && 1147 !VerifyOatImageChecksum(oat_file.get(), isa)) { 1148 error_msgs->push_back(StringPrintf("Failed to verify non-executable oat file '%s' found for " 1149 "dex location '%s'. Image checksum incorrect.", 1150 oat_file->GetLocation().c_str(), dex_location)); 1151 return nullptr; 1152 } else { 1153 return oat_file.release(); 1154 } 1155} 1156 1157const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1158 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1159 for (size_t i = 0; i < oat_files_.size(); i++) { 1160 const OatFile* oat_file = oat_files_[i]; 1161 DCHECK(oat_file != nullptr); 1162 if (oat_file->GetLocation() == oat_location) { 1163 return oat_file; 1164 } 1165 } 1166 return nullptr; 1167} 1168 1169const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1170 InstructionSet isa, 1171 bool *already_opened, 1172 bool *obsolete_file_cleanup_failed, 1173 std::vector<std::string>* error_msgs) { 1174 // Find out if we've already opened the file 1175 const OatFile* ret = nullptr; 1176 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1177 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1178 if (ret != nullptr) { 1179 *already_opened = true; 1180 return ret; 1181 } 1182 1183 std::string dalvik_cache; 1184 bool have_android_data = false; 1185 bool have_dalvik_cache = false; 1186 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1187 &have_android_data, &have_dalvik_cache); 1188 std::string cache_filename; 1189 if (have_dalvik_cache) { 1190 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1191 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1192 if (ret != nullptr) { 1193 *already_opened = true; 1194 return ret; 1195 } 1196 } else { 1197 // If we need to relocate we should just place odex back where it started. 1198 cache_filename = odex_filename; 1199 } 1200 1201 ret = nullptr; 1202 1203 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1204 // 1205 // Now we do the following: 1206 // 1) Try and open the odex version 1207 // 2) If present, checksum-verified & relocated correctly return it 1208 // 3) Close the odex version to free up its address space. 1209 // 4) Try and open the cache version 1210 // 5) If present, checksum-verified & relocated correctly return it 1211 // 6) Close the cache version to free up its address space. 1212 // 7) If we should relocate: 1213 // a) If we have opened and checksum-verified the odex version relocate it to 1214 // 'cache_filename' and return it 1215 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1216 // it. This should not happen often (I think only the run-test's will hit this case). 1217 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1218 // this point. 1219 // 9) Return nullptr 1220 1221 *already_opened = false; 1222 const Runtime* runtime = Runtime::Current(); 1223 CHECK(runtime != nullptr); 1224 bool executable = !runtime->IsCompiler(); 1225 1226 std::string odex_error_msg; 1227 bool should_patch_system = false; 1228 bool odex_checksum_verified = false; 1229 { 1230 // There is a high probability that these both these oat files map similar/the same address 1231 // spaces so we must scope them like this so they each gets its turn. 1232 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, NULL, 1233 executable, &odex_error_msg)); 1234 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1235 &odex_checksum_verified, 1236 &odex_error_msg)) { 1237 error_msgs->push_back(odex_error_msg); 1238 return odex_oat_file.release(); 1239 } else if (odex_checksum_verified) { 1240 // We can just relocate 1241 should_patch_system = true; 1242 odex_error_msg = "Image Patches are incorrect"; 1243 } 1244 } 1245 1246 1247 std::string cache_error_msg; 1248 bool should_patch_cache = false; 1249 bool cache_checksum_verified = false; 1250 if (have_dalvik_cache) { 1251 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, NULL, 1252 executable, &cache_error_msg)); 1253 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1254 &cache_checksum_verified, 1255 &cache_error_msg)) { 1256 error_msgs->push_back(cache_error_msg); 1257 return cache_oat_file.release(); 1258 } else if (cache_checksum_verified) { 1259 // We can just relocate 1260 should_patch_cache = true; 1261 cache_error_msg = "Image Patches are incorrect"; 1262 } 1263 } else if (have_android_data) { 1264 // dalvik_cache does not exist but android data does. This means we should be able to create 1265 // it, so we should try. 1266 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1267 } 1268 1269 ret = nullptr; 1270 std::string error_msg; 1271 if (runtime->CanRelocate()) { 1272 // Run relocation 1273 const std::string& image_location = 1274 Runtime::Current()->GetHeap()->GetImageSpace()->GetImageLocation(); 1275 if (odex_checksum_verified && should_patch_system) { 1276 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1277 } else if (cache_checksum_verified && should_patch_cache) { 1278 CHECK(have_dalvik_cache); 1279 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1280 } 1281 } 1282 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1283 // implicitly: were able to fine where the cached version is but we were unable to use it, 1284 // either as a destination for relocation or to open a file. We should delete it if it is 1285 // there. 1286 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1287 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1288 "searching for dex file %s: %s", 1289 cache_filename.c_str(), dex_location.c_str(), 1290 strerror(errno)); 1291 error_msgs->push_back(rm_error_msg); 1292 VLOG(class_linker) << rm_error_msg; 1293 // Let the caller know that we couldn't remove the obsolete file. 1294 // This is a good indication that further writes may fail as well. 1295 *obsolete_file_cleanup_failed = true; 1296 } 1297 } 1298 if (ret == nullptr) { 1299 VLOG(class_linker) << error_msg; 1300 error_msgs->push_back(error_msg); 1301 std::string relocation_msg; 1302 if (runtime->CanRelocate()) { 1303 relocation_msg = StringPrintf(" and relocation failed"); 1304 } 1305 if (have_dalvik_cache && cache_checksum_verified) { 1306 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1307 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1308 cache_filename.c_str(), cache_error_msg.c_str(), 1309 relocation_msg.c_str()); 1310 } else { 1311 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1312 "dalvik_cache availible)%s.", odex_filename.c_str(), 1313 odex_error_msg.c_str(), relocation_msg.c_str()); 1314 } 1315 VLOG(class_linker) << error_msg; 1316 error_msgs->push_back(error_msg); 1317 } 1318 return ret; 1319} 1320 1321const OatFile* ClassLinker::GetInterpretedOnlyOat(const std::string& oat_path, 1322 InstructionSet isa, 1323 std::string* error_msg) { 1324 // We open it non-executable 1325 std::unique_ptr<OatFile> output(OatFile::Open(oat_path, oat_path, NULL, false, error_msg)); 1326 if (output.get() == nullptr) { 1327 return nullptr; 1328 } 1329 if (VerifyOatImageChecksum(output.get(), isa)) { 1330 return output.release(); 1331 } else { 1332 *error_msg = StringPrintf("Could not use oat file '%s', image checksum failed to verify.", 1333 oat_path.c_str()); 1334 return nullptr; 1335 } 1336} 1337 1338const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1339 const std::string& output_oat, 1340 const std::string& image_location, 1341 InstructionSet isa, 1342 std::string* error_msg) { 1343 if (!Runtime::Current()->IsDex2OatEnabled()) { 1344 // We don't have dex2oat so we can assume we don't have patchoat either. We should just use the 1345 // input_oat but make sure we only do interpretation on it's dex files. 1346 LOG(WARNING) << "Patching of oat file '" << input_oat << "' not attempted due to dex2oat being " 1347 << "disabled. Attempting to use oat file for interpretation"; 1348 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1349 } 1350 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1351 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1352 1353 std::string isa_arg("--instruction-set="); 1354 isa_arg += GetInstructionSetString(isa); 1355 std::string input_oat_filename_arg("--input-oat-file="); 1356 input_oat_filename_arg += input_oat; 1357 std::string output_oat_filename_arg("--output-oat-file="); 1358 output_oat_filename_arg += output_oat; 1359 std::string patched_image_arg("--patched-image-location="); 1360 patched_image_arg += image_location; 1361 1362 std::vector<std::string> argv; 1363 argv.push_back(patchoat); 1364 argv.push_back(isa_arg); 1365 argv.push_back(input_oat_filename_arg); 1366 argv.push_back(output_oat_filename_arg); 1367 argv.push_back(patched_image_arg); 1368 1369 std::string command_line(Join(argv, ' ')); 1370 LOG(INFO) << "Relocate Oat File: " << command_line; 1371 bool success = Exec(argv, error_msg); 1372 if (success) { 1373 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, NULL, 1374 !Runtime::Current()->IsCompiler(), error_msg)); 1375 bool checksum_verified = false; 1376 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1377 return output.release(); 1378 } else if (output.get() != nullptr) { 1379 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1380 "but output file '%s' failed verifcation: %s", 1381 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1382 } else { 1383 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1384 "but was unable to open output file '%s': %s", 1385 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1386 } 1387 } else if (!Runtime::Current()->IsCompiler()) { 1388 // patchoat failed which means we probably don't have enough room to place the output oat file, 1389 // instead of failing we should just run the interpreter from the dex files in the input oat. 1390 LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file " 1391 << "for interpretation. patchoat failure was: " << *error_msg; 1392 return GetInterpretedOnlyOat(input_oat, isa, error_msg); 1393 } else { 1394 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1395 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1396 error_msg->c_str()); 1397 } 1398 return nullptr; 1399} 1400 1401int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1402 Runtime* runtime = Runtime::Current(); 1403 int32_t real_patch_delta; 1404 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1405 if (isa == Runtime::Current()->GetInstructionSet()) { 1406 const ImageHeader& image_header = image_space->GetImageHeader(); 1407 real_patch_delta = image_header.GetPatchDelta(); 1408 } else { 1409 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1410 image_space->GetImageLocation().c_str(), isa)); 1411 real_patch_delta = image_header->GetPatchDelta(); 1412 } 1413 const OatHeader& oat_header = oat_file->GetOatHeader(); 1414 return real_patch_delta - oat_header.GetImagePatchDelta(); 1415} 1416 1417bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1418 bool* checksum_verified, 1419 std::string* error_msg) { 1420 std::string compound_msg("Oat file failed to verify: "); 1421 Runtime* runtime = Runtime::Current(); 1422 uint32_t real_image_checksum; 1423 void* real_image_oat_offset; 1424 int32_t real_patch_delta; 1425 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1426 if (isa == Runtime::Current()->GetInstructionSet()) { 1427 const ImageHeader& image_header = image_space->GetImageHeader(); 1428 real_image_checksum = image_header.GetOatChecksum(); 1429 real_image_oat_offset = image_header.GetOatDataBegin(); 1430 real_patch_delta = image_header.GetPatchDelta(); 1431 } else { 1432 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1433 image_space->GetImageLocation().c_str(), isa)); 1434 real_image_checksum = image_header->GetOatChecksum(); 1435 real_image_oat_offset = image_header->GetOatDataBegin(); 1436 real_patch_delta = image_header->GetPatchDelta(); 1437 } 1438 1439 const OatHeader& oat_header = oat_file->GetOatHeader(); 1440 1441 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1442 *checksum_verified = oat_image_checksum == real_image_checksum; 1443 if (!*checksum_verified) { 1444 compound_msg += StringPrintf(" Oat Image Checksum Incorrect (expected 0x%x, recieved 0x%x)", 1445 real_image_checksum, oat_image_checksum); 1446 } 1447 1448 void* oat_image_oat_offset = 1449 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1450 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1451 if (!offset_verified) { 1452 compound_msg += StringPrintf(" Oat Image oat offset incorrect (expected 0x%p, recieved 0x%p)", 1453 real_image_oat_offset, oat_image_oat_offset); 1454 } 1455 1456 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1457 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1458 if (!patch_delta_verified) { 1459 compound_msg += StringPrintf(" Oat image patch delta incorrect (expected 0x%x, recieved 0x%x)", 1460 real_patch_delta, oat_patch_delta); 1461 } 1462 1463 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1464 if (ret) { 1465 *error_msg = compound_msg; 1466 } 1467 return ret; 1468} 1469 1470const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1471 std::string* error_msg) { 1472 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1473 if (oat_file != nullptr) { 1474 return oat_file; 1475 } 1476 1477 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1478 error_msg); 1479 if (oat_file == NULL) { 1480 return NULL; 1481 } 1482 return oat_file; 1483} 1484 1485static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1486 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1487 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1488 1489 DCHECK(obj != NULL); 1490 DCHECK(class_linker != NULL); 1491 1492 if (obj->IsArtMethod()) { 1493 mirror::ArtMethod* method = obj->AsArtMethod(); 1494 if (!method->IsNative()) { 1495 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1496 if (method != Runtime::Current()->GetResolutionMethod()) { 1497 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1498 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1499 } 1500 } 1501 } 1502} 1503 1504void ClassLinker::InitFromImage() { 1505 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1506 CHECK(!init_done_); 1507 1508 Thread* self = Thread::Current(); 1509 gc::Heap* heap = Runtime::Current()->GetHeap(); 1510 gc::space::ImageSpace* space = heap->GetImageSpace(); 1511 dex_cache_image_class_lookup_required_ = true; 1512 CHECK(space != NULL); 1513 OatFile& oat_file = GetImageOatFile(space); 1514 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1515 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1516 const char* image_file_location = oat_file.GetOatHeader(). 1517 GetStoreValueByKey(OatHeader::kImageLocationKey); 1518 CHECK(image_file_location == nullptr || *image_file_location == 0); 1519 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1520 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1521 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1522 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1523 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1524 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1525 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1526 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1527 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1528 1529 StackHandleScope<1> hs(self); 1530 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1531 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1532 AsObjectArray<mirror::Class>())); 1533 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1534 1535 // Special case of setting up the String class early so that we can test arbitrary objects 1536 // as being Strings or not 1537 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1538 1539 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1540 static_cast<uint32_t>(dex_caches->GetLength())); 1541 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1542 StackHandleScope<1> hs(self); 1543 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1544 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1545 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1546 nullptr); 1547 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1548 std::string error_msg; 1549 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1550 if (dex_file == NULL) { 1551 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1552 << " from within oat file " << oat_file.GetLocation() 1553 << " error '" << error_msg << "'"; 1554 } 1555 1556 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1557 1558 AppendToBootClassPath(*dex_file, dex_cache); 1559 } 1560 1561 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1562 // bitmap walk. 1563 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1564 1565 // Set entry point to interpreter if in InterpretOnly mode. 1566 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1567 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1568 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1569 } 1570 1571 // reinit class_roots_ 1572 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1573 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1574 1575 // reinit array_iftable_ from any array class instance, they should be == 1576 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1577 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1578 // String class root was set above 1579 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1580 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1581 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1582 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1583 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1584 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1585 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1586 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1587 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1588 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1589 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1590 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1591 1592 FinishInit(self); 1593 1594 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1595} 1596 1597void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1598 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1599 if ((flags & kVisitRootFlagAllRoots) != 0) { 1600 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1601 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1602 } 1603 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1604 for (auto& pair : new_class_roots_) { 1605 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1606 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1607 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1608 if (UNLIKELY(new_ref != old_ref)) { 1609 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1610 // corresponding object. This is slow, but luckily for us, this may only happen with a 1611 // concurrent moving GC. 1612 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1613 it != end && it->first == pair.first; ++it) { 1614 // If the class stored matches the old class, update it to the new value. 1615 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1616 it->second = GcRoot<mirror::Class>(new_ref); 1617 } 1618 } 1619 } 1620 } 1621 } 1622 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1623 new_class_roots_.clear(); 1624 } 1625 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1626 log_new_class_table_roots_ = true; 1627 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1628 log_new_class_table_roots_ = false; 1629 } 1630 // We deliberately ignore the class roots in the image since we 1631 // handle image roots by using the MS/CMS rescanning of dirty cards. 1632} 1633 1634// Keep in sync with InitCallback. Anything we visit, we need to 1635// reinit references to when reinitializing a ClassLinker from a 1636// mapped image. 1637void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1638 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1639 Thread* self = Thread::Current(); 1640 { 1641 ReaderMutexLock mu(self, dex_lock_); 1642 if ((flags & kVisitRootFlagAllRoots) != 0) { 1643 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1644 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1645 } 1646 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1647 for (size_t index : new_dex_cache_roots_) { 1648 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1649 } 1650 } 1651 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1652 new_dex_cache_roots_.clear(); 1653 } 1654 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1655 log_new_dex_caches_roots_ = true; 1656 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1657 log_new_dex_caches_roots_ = false; 1658 } 1659 } 1660 VisitClassRoots(callback, arg, flags); 1661 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1662 DCHECK(!array_iftable_.IsNull()); 1663 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1664 if (!find_array_class_cache_[i].IsNull()) { 1665 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1666 } 1667 } 1668} 1669 1670void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1671 if (dex_cache_image_class_lookup_required_) { 1672 MoveImageClassesToClassTable(); 1673 } 1674 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1675 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1676 mirror::Class* c = it.second.Read(); 1677 if (!visitor(c, arg)) { 1678 return; 1679 } 1680 } 1681} 1682 1683static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1684 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1685 classes->insert(c); 1686 return true; 1687} 1688 1689void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1690 std::set<mirror::Class*> classes; 1691 VisitClasses(GetClassesVisitor, &classes); 1692 for (mirror::Class* klass : classes) { 1693 if (!visitor(klass, arg)) { 1694 return; 1695 } 1696 } 1697} 1698 1699ClassLinker::~ClassLinker() { 1700 mirror::Class::ResetClass(); 1701 mirror::String::ResetClass(); 1702 mirror::Reference::ResetClass(); 1703 mirror::ArtField::ResetClass(); 1704 mirror::ArtMethod::ResetClass(); 1705 mirror::BooleanArray::ResetArrayClass(); 1706 mirror::ByteArray::ResetArrayClass(); 1707 mirror::CharArray::ResetArrayClass(); 1708 mirror::DoubleArray::ResetArrayClass(); 1709 mirror::FloatArray::ResetArrayClass(); 1710 mirror::IntArray::ResetArrayClass(); 1711 mirror::LongArray::ResetArrayClass(); 1712 mirror::ShortArray::ResetArrayClass(); 1713 mirror::Throwable::ResetClass(); 1714 mirror::StackTraceElement::ResetClass(); 1715 STLDeleteElements(&boot_class_path_); 1716 STLDeleteElements(&oat_files_); 1717} 1718 1719mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1720 gc::Heap* heap = Runtime::Current()->GetHeap(); 1721 StackHandleScope<16> hs(self); 1722 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1723 Handle<mirror::DexCache> dex_cache( 1724 hs.NewHandle(down_cast<mirror::DexCache*>( 1725 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1726 VoidFunctor())))); 1727 if (dex_cache.Get() == NULL) { 1728 return NULL; 1729 } 1730 Handle<mirror::String> 1731 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1732 if (location.Get() == NULL) { 1733 return NULL; 1734 } 1735 Handle<mirror::ObjectArray<mirror::String>> 1736 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1737 if (strings.Get() == NULL) { 1738 return NULL; 1739 } 1740 Handle<mirror::ObjectArray<mirror::Class>> 1741 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1742 if (types.Get() == NULL) { 1743 return NULL; 1744 } 1745 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1746 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1747 if (methods.Get() == NULL) { 1748 return NULL; 1749 } 1750 Handle<mirror::ObjectArray<mirror::ArtField>> 1751 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1752 if (fields.Get() == NULL) { 1753 return NULL; 1754 } 1755 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1756 fields.Get()); 1757 return dex_cache.Get(); 1758} 1759 1760mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1761 uint32_t class_size) { 1762 DCHECK_GE(class_size, sizeof(mirror::Class)); 1763 gc::Heap* heap = Runtime::Current()->GetHeap(); 1764 mirror::Class::InitializeClassVisitor visitor(class_size); 1765 mirror::Object* k = kMovingClasses ? 1766 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1767 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1768 if (UNLIKELY(k == nullptr)) { 1769 CHECK(self->IsExceptionPending()); // OOME. 1770 return nullptr; 1771 } 1772 return k->AsClass(); 1773} 1774 1775mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1776 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1777} 1778 1779mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1780 return down_cast<mirror::ArtField*>( 1781 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1782} 1783 1784mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1785 return down_cast<mirror::ArtMethod*>( 1786 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1787} 1788 1789mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1790 Thread* self, size_t length) { 1791 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1792 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1793} 1794 1795mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1796 mirror::Class* klass) { 1797 DCHECK(klass != NULL); 1798 1799 // For temporary classes we must wait for them to be retired. 1800 if (init_done_ && klass->IsTemp()) { 1801 CHECK(!klass->IsResolved()); 1802 if (klass->IsErroneous()) { 1803 ThrowEarlierClassFailure(klass); 1804 return nullptr; 1805 } 1806 StackHandleScope<1> hs(self); 1807 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1808 ObjectLock<mirror::Class> lock(self, h_class); 1809 // Loop and wait for the resolving thread to retire this class. 1810 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1811 lock.WaitIgnoringInterrupts(); 1812 } 1813 if (h_class->IsErroneous()) { 1814 ThrowEarlierClassFailure(h_class.Get()); 1815 return nullptr; 1816 } 1817 CHECK(h_class->IsRetired()); 1818 // Get the updated class from class table. 1819 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1820 } 1821 1822 // Wait for the class if it has not already been linked. 1823 if (!klass->IsResolved() && !klass->IsErroneous()) { 1824 StackHandleScope<1> hs(self); 1825 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1826 ObjectLock<mirror::Class> lock(self, h_class); 1827 // Check for circular dependencies between classes. 1828 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1829 ThrowClassCircularityError(h_class.Get()); 1830 h_class->SetStatus(mirror::Class::kStatusError, self); 1831 return nullptr; 1832 } 1833 // Wait for the pending initialization to complete. 1834 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1835 lock.WaitIgnoringInterrupts(); 1836 } 1837 } 1838 1839 if (klass->IsErroneous()) { 1840 ThrowEarlierClassFailure(klass); 1841 return nullptr; 1842 } 1843 // Return the loaded class. No exceptions should be pending. 1844 CHECK(klass->IsResolved()) << PrettyClass(klass); 1845 self->AssertNoPendingException(); 1846 return klass; 1847} 1848 1849mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1850 Handle<mirror::ClassLoader> class_loader) { 1851 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1852 DCHECK(self != nullptr); 1853 self->AssertNoPendingException(); 1854 if (descriptor[1] == '\0') { 1855 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1856 // for primitive classes that aren't backed by dex files. 1857 return FindPrimitiveClass(descriptor[0]); 1858 } 1859 // Find the class in the loaded classes table. 1860 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1861 if (klass != NULL) { 1862 return EnsureResolved(self, descriptor, klass); 1863 } 1864 // Class is not yet loaded. 1865 if (descriptor[0] == '[') { 1866 return CreateArrayClass(self, descriptor, class_loader); 1867 } else if (class_loader.Get() == nullptr) { 1868 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1869 if (pair.second != NULL) { 1870 StackHandleScope<1> hs(self); 1871 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1872 } 1873 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1874 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1875 // throw of a NoClassDefFoundError. 1876 if (IsInBootClassPath(descriptor)) { 1877 mirror::Class* system_class = FindSystemClass(self, descriptor); 1878 CHECK(system_class != NULL); 1879 return system_class; 1880 } 1881 // Next try the compile time class path. 1882 const std::vector<const DexFile*>* class_path; 1883 { 1884 ScopedObjectAccessUnchecked soa(self); 1885 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1886 soa.AddLocalReference<jobject>(class_loader.Get())); 1887 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1888 } 1889 1890 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1891 if (pair.second != NULL) { 1892 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1893 } 1894 1895 } else { 1896 ScopedObjectAccessUnchecked soa(self); 1897 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1898 soa.AddLocalReference<jobject>(class_loader.Get())); 1899 std::string class_name_string(DescriptorToDot(descriptor)); 1900 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1901 { 1902 ScopedThreadStateChange tsc(self, kNative); 1903 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1904 soa.Env()->NewStringUTF(class_name_string.c_str())); 1905 if (class_name_object.get() == NULL) { 1906 return NULL; 1907 } 1908 CHECK(class_loader_object.get() != NULL); 1909 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1910 WellKnownClasses::java_lang_ClassLoader_loadClass, 1911 class_name_object.get())); 1912 } 1913 if (self->IsExceptionPending()) { 1914 // If the ClassLoader threw, pass that exception up. 1915 return NULL; 1916 } else if (result.get() == NULL) { 1917 // broken loader - throw NPE to be compatible with Dalvik 1918 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1919 class_name_string.c_str()).c_str()); 1920 return NULL; 1921 } else { 1922 // success, return mirror::Class* 1923 return soa.Decode<mirror::Class*>(result.get()); 1924 } 1925 } 1926 1927 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1928 return NULL; 1929} 1930 1931mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1932 Handle<mirror::ClassLoader> class_loader, 1933 const DexFile& dex_file, 1934 const DexFile::ClassDef& dex_class_def) { 1935 Thread* self = Thread::Current(); 1936 StackHandleScope<3> hs(self); 1937 auto klass = hs.NewHandle<mirror::Class>(nullptr); 1938 bool should_allocate = false; 1939 1940 // Load the class from the dex file. 1941 if (UNLIKELY(!init_done_)) { 1942 // finish up init of hand crafted class_roots_ 1943 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1944 klass.Assign(GetClassRoot(kJavaLangObject)); 1945 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1946 klass.Assign(GetClassRoot(kJavaLangClass)); 1947 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1948 klass.Assign(GetClassRoot(kJavaLangString)); 1949 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 1950 klass.Assign(GetClassRoot(kJavaLangRefReference)); 1951 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1952 klass.Assign(GetClassRoot(kJavaLangDexCache)); 1953 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1954 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 1955 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1956 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 1957 } else { 1958 should_allocate = true; 1959 } 1960 } else { 1961 should_allocate = true; 1962 } 1963 1964 if (should_allocate) { 1965 // Allocate a class with the status of not ready. 1966 // Interface object should get the right size here. Regular class will 1967 // figure out the right size later and be replaced with one of the right 1968 // size when the class becomes resolved. 1969 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 1970 } 1971 if (UNLIKELY(klass.Get() == nullptr)) { 1972 CHECK(self->IsExceptionPending()); // Expect an OOME. 1973 return nullptr; 1974 } 1975 klass->SetDexCache(FindDexCache(dex_file)); 1976 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 1977 ObjectLock<mirror::Class> lock(self, klass); 1978 if (self->IsExceptionPending()) { 1979 // An exception occured during load, set status to erroneous while holding klass' lock in case 1980 // notification is necessary. 1981 if (!klass->IsErroneous()) { 1982 klass->SetStatus(mirror::Class::kStatusError, self); 1983 } 1984 return nullptr; 1985 } 1986 klass->SetClinitThreadId(self->GetTid()); 1987 1988 // Add the newly loaded class to the loaded classes table. 1989 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 1990 if (existing != nullptr) { 1991 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1992 // this thread to block. 1993 return EnsureResolved(self, descriptor, existing); 1994 } 1995 1996 // Finish loading (if necessary) by finding parents 1997 CHECK(!klass->IsLoaded()); 1998 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1999 // Loading failed. 2000 if (!klass->IsErroneous()) { 2001 klass->SetStatus(mirror::Class::kStatusError, self); 2002 } 2003 return nullptr; 2004 } 2005 CHECK(klass->IsLoaded()); 2006 // Link the class (if necessary) 2007 CHECK(!klass->IsResolved()); 2008 // TODO: Use fast jobjects? 2009 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 2010 2011 mirror::Class* new_class = nullptr; 2012 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 2013 // Linking failed. 2014 if (!klass->IsErroneous()) { 2015 klass->SetStatus(mirror::Class::kStatusError, self); 2016 } 2017 return nullptr; 2018 } 2019 CHECK(new_class != nullptr) << descriptor; 2020 CHECK(new_class->IsResolved()) << descriptor; 2021 2022 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 2023 2024 /* 2025 * We send CLASS_PREPARE events to the debugger from here. The 2026 * definition of "preparation" is creating the static fields for a 2027 * class and initializing them to the standard default values, but not 2028 * executing any code (that comes later, during "initialization"). 2029 * 2030 * We did the static preparation in LinkClass. 2031 * 2032 * The class has been prepared and resolved but possibly not yet verified 2033 * at this point. 2034 */ 2035 Dbg::PostClassPrepare(new_class_h.Get()); 2036 2037 return new_class_h.Get(); 2038} 2039 2040uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2041 const DexFile::ClassDef& dex_class_def) { 2042 const byte* class_data = dex_file.GetClassData(dex_class_def); 2043 size_t num_ref = 0; 2044 size_t num_32 = 0; 2045 size_t num_64 = 0; 2046 if (class_data != NULL) { 2047 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2048 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2049 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2050 char c = descriptor[0]; 2051 if (c == 'L' || c == '[') { 2052 num_ref++; 2053 } else if (c == 'J' || c == 'D') { 2054 num_64++; 2055 } else { 2056 num_32++; 2057 } 2058 } 2059 } 2060 return mirror::Class::ComputeClassSize(false, 0, num_32, num_64, num_ref); 2061} 2062 2063OatFile::OatClass ClassLinker::FindOatClass(const DexFile& dex_file, uint16_t class_def_idx, 2064 bool* found) { 2065 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2066 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2067 if (oat_file == nullptr) { 2068 *found = false; 2069 return OatFile::OatClass::Invalid(); 2070 } 2071 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2072 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2073 &dex_location_checksum); 2074 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 2075 *found = true; 2076 return oat_dex_file->GetOatClass(class_def_idx); 2077} 2078 2079static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2080 uint32_t method_idx) { 2081 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2082 const byte* class_data = dex_file.GetClassData(class_def); 2083 CHECK(class_data != NULL); 2084 ClassDataItemIterator it(dex_file, class_data); 2085 // Skip fields 2086 while (it.HasNextStaticField()) { 2087 it.Next(); 2088 } 2089 while (it.HasNextInstanceField()) { 2090 it.Next(); 2091 } 2092 // Process methods 2093 size_t class_def_method_index = 0; 2094 while (it.HasNextDirectMethod()) { 2095 if (it.GetMemberIndex() == method_idx) { 2096 return class_def_method_index; 2097 } 2098 class_def_method_index++; 2099 it.Next(); 2100 } 2101 while (it.HasNextVirtualMethod()) { 2102 if (it.GetMemberIndex() == method_idx) { 2103 return class_def_method_index; 2104 } 2105 class_def_method_index++; 2106 it.Next(); 2107 } 2108 DCHECK(!it.HasNext()); 2109 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2110 return 0; 2111} 2112 2113const OatFile::OatMethod ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, bool* found) { 2114 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2115 // method for direct methods (or virtual methods made direct). 2116 mirror::Class* declaring_class = method->GetDeclaringClass(); 2117 size_t oat_method_index; 2118 if (method->IsStatic() || method->IsDirect()) { 2119 // Simple case where the oat method index was stashed at load time. 2120 oat_method_index = method->GetMethodIndex(); 2121 } else { 2122 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2123 // by search for its position in the declared virtual methods. 2124 oat_method_index = declaring_class->NumDirectMethods(); 2125 size_t end = declaring_class->NumVirtualMethods(); 2126 bool found = false; 2127 for (size_t i = 0; i < end; i++) { 2128 if (declaring_class->GetVirtualMethod(i) == method) { 2129 found = true; 2130 break; 2131 } 2132 oat_method_index++; 2133 } 2134 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2135 } 2136 DCHECK_EQ(oat_method_index, 2137 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2138 method->GetDeclaringClass()->GetDexClassDefIndex(), 2139 method->GetDexMethodIndex())); 2140 OatFile::OatClass oat_class = FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2141 declaring_class->GetDexClassDefIndex(), 2142 found); 2143 if (!found) { 2144 return OatFile::OatMethod::Invalid(); 2145 } 2146 *found = true; 2147 return oat_class.GetOatMethod(oat_method_index); 2148} 2149 2150// Special case to get oat code without overwriting a trampoline. 2151const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2152 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2153 if (method->IsProxyMethod()) { 2154 return GetQuickProxyInvokeHandler(); 2155 } 2156 bool found; 2157 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2158 const void* result = nullptr; 2159 if (found) { 2160 result = oat_method.GetQuickCode(); 2161 } 2162 2163 if (result == nullptr) { 2164 if (method->IsNative()) { 2165 // No code and native? Use generic trampoline. 2166 result = GetQuickGenericJniTrampoline(); 2167 } else if (method->IsPortableCompiled()) { 2168 // No code? Do we expect portable code? 2169 result = GetQuickToPortableBridge(); 2170 } else { 2171 // No code? You must mean to go into the interpreter. 2172 result = GetQuickToInterpreterBridge(); 2173 } 2174 } 2175 return result; 2176} 2177 2178const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2179 bool* have_portable_code) { 2180 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2181 *have_portable_code = false; 2182 if (method->IsProxyMethod()) { 2183 return GetPortableProxyInvokeHandler(); 2184 } 2185 bool found; 2186 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2187 const void* result = nullptr; 2188 const void* quick_code = nullptr; 2189 if (found) { 2190 result = oat_method.GetPortableCode(); 2191 quick_code = oat_method.GetQuickCode(); 2192 } 2193 2194 if (result == nullptr) { 2195 if (quick_code == nullptr) { 2196 // No code? You must mean to go into the interpreter. 2197 result = GetPortableToInterpreterBridge(); 2198 } else { 2199 // No code? But there's quick code, so use a bridge. 2200 result = GetPortableToQuickBridge(); 2201 } 2202 } else { 2203 *have_portable_code = true; 2204 } 2205 return result; 2206} 2207 2208const void* ClassLinker::GetOatMethodQuickCodeFor(mirror::ArtMethod* method) { 2209 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2210 return nullptr; 2211 } 2212 bool found; 2213 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2214 return found ? oat_method.GetQuickCode() : nullptr; 2215} 2216 2217const void* ClassLinker::GetOatMethodPortableCodeFor(mirror::ArtMethod* method) { 2218 if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) { 2219 return nullptr; 2220 } 2221 bool found; 2222 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2223 return found ? oat_method.GetPortableCode() : nullptr; 2224} 2225 2226const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2227 uint32_t method_idx) { 2228 bool found; 2229 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2230 if (!found) { 2231 return nullptr; 2232 } 2233 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2234 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2235} 2236 2237const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2238 uint32_t method_idx) { 2239 bool found; 2240 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2241 if (!found) { 2242 return nullptr; 2243 } 2244 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2245 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2246} 2247 2248// Returns true if the method must run with interpreter, false otherwise. 2249static bool NeedsInterpreter( 2250 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2251 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2252 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2253 // No code: need interpreter. 2254 // May return true for native code, in the case of generic JNI 2255 // DCHECK(!method->IsNative()); 2256 return true; 2257 } 2258#ifdef ART_SEA_IR_MODE 2259 ScopedObjectAccess soa(Thread::Current()); 2260 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2261 LOG(INFO) << "Found " << PrettyMethod(method); 2262 return false; 2263 } 2264#endif 2265 // If interpreter mode is enabled, every method (except native and proxy) must 2266 // be run with interpreter. 2267 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2268 !method->IsNative() && !method->IsProxyMethod(); 2269} 2270 2271void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2272 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2273 if (klass->NumDirectMethods() == 0) { 2274 return; // No direct methods => no static methods. 2275 } 2276 Runtime* runtime = Runtime::Current(); 2277 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2278 return; // OAT file unavailable. 2279 } 2280 const DexFile& dex_file = klass->GetDexFile(); 2281 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2282 CHECK(dex_class_def != nullptr); 2283 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2284 // There should always be class data if there were direct methods. 2285 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2286 ClassDataItemIterator it(dex_file, class_data); 2287 // Skip fields 2288 while (it.HasNextStaticField()) { 2289 it.Next(); 2290 } 2291 while (it.HasNextInstanceField()) { 2292 it.Next(); 2293 } 2294 bool has_oat_class; 2295 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2296 &has_oat_class); 2297 // Link the code of methods skipped by LinkCode. 2298 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2299 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2300 if (!method->IsStatic()) { 2301 // Only update static methods. 2302 continue; 2303 } 2304 const void* portable_code = nullptr; 2305 const void* quick_code = nullptr; 2306 if (has_oat_class) { 2307 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2308 portable_code = oat_method.GetPortableCode(); 2309 quick_code = oat_method.GetQuickCode(); 2310 } 2311 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2312 bool have_portable_code = false; 2313 if (enter_interpreter) { 2314 // Use interpreter entry point. 2315 // Check whether the method is native, in which case it's generic JNI. 2316 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2317 quick_code = GetQuickGenericJniTrampoline(); 2318 portable_code = GetPortableToQuickBridge(); 2319 } else { 2320 portable_code = GetPortableToInterpreterBridge(); 2321 quick_code = GetQuickToInterpreterBridge(); 2322 } 2323 } else { 2324 if (portable_code == nullptr) { 2325 portable_code = GetPortableToQuickBridge(); 2326 } else { 2327 have_portable_code = true; 2328 } 2329 if (quick_code == nullptr) { 2330 quick_code = GetQuickToPortableBridge(); 2331 } 2332 } 2333 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2334 have_portable_code); 2335 } 2336 // Ignore virtual methods on the iterator. 2337} 2338 2339void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 2340 const DexFile& dex_file, uint32_t dex_method_index, 2341 uint32_t method_index) { 2342 if (Runtime::Current()->IsCompiler()) { 2343 // The following code only applies to a non-compiler runtime. 2344 return; 2345 } 2346 // Method shouldn't have already been linked. 2347 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2348 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2349 if (oat_class != nullptr) { 2350 // Every kind of method should at least get an invoke stub from the oat_method. 2351 // non-abstract methods also get their code pointers. 2352 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2353 oat_method.LinkMethod(method.Get()); 2354 } 2355 2356 // Install entry point from interpreter. 2357 bool enter_interpreter = NeedsInterpreter(method.Get(), 2358 method->GetEntryPointFromQuickCompiledCode(), 2359 method->GetEntryPointFromPortableCompiledCode()); 2360 if (enter_interpreter && !method->IsNative()) { 2361 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2362 } else { 2363 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2364 } 2365 2366 if (method->IsAbstract()) { 2367 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2368 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2369 return; 2370 } 2371 2372 bool have_portable_code = false; 2373 if (method->IsStatic() && !method->IsConstructor()) { 2374 // For static methods excluding the class initializer, install the trampoline. 2375 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2376 // after initializing class (see ClassLinker::InitializeClass method). 2377 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2378 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2379 } else if (enter_interpreter) { 2380 if (!method->IsNative()) { 2381 // Set entry point from compiled code if there's no code or in interpreter only mode. 2382 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2383 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2384 } else { 2385 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2386 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2387 } 2388 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2389 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2390 have_portable_code = true; 2391 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2392 } else { 2393 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2394 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2395 } 2396 2397 if (method->IsNative()) { 2398 // Unregistering restores the dlsym lookup stub. 2399 method->UnregisterNative(Thread::Current()); 2400 2401 if (enter_interpreter) { 2402 // We have a native method here without code. Then it should have either the GenericJni 2403 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2404 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2405 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2406 } 2407 } 2408 2409 // Allow instrumentation its chance to hijack code. 2410 Runtime* runtime = Runtime::Current(); 2411 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2412 method->GetEntryPointFromQuickCompiledCode(), 2413 method->GetEntryPointFromPortableCompiledCode(), 2414 have_portable_code); 2415} 2416 2417void ClassLinker::LoadClass(const DexFile& dex_file, 2418 const DexFile::ClassDef& dex_class_def, 2419 Handle<mirror::Class> klass, 2420 mirror::ClassLoader* class_loader) { 2421 CHECK(klass.Get() != NULL); 2422 CHECK(klass->GetDexCache() != NULL); 2423 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2424 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2425 CHECK(descriptor != NULL); 2426 2427 klass->SetClass(GetClassRoot(kJavaLangClass)); 2428 if (kUseBakerOrBrooksReadBarrier) { 2429 klass->AssertReadBarrierPointer(); 2430 } 2431 uint32_t access_flags = dex_class_def.access_flags_; 2432 // Make sure that none of our runtime-only flags are set. 2433 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2434 klass->SetAccessFlags(access_flags); 2435 klass->SetClassLoader(class_loader); 2436 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2437 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2438 2439 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2440 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2441 2442 const byte* class_data = dex_file.GetClassData(dex_class_def); 2443 if (class_data == NULL) { 2444 return; // no fields or methods - for example a marker interface 2445 } 2446 2447 2448 bool has_oat_class = false; 2449 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2450 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2451 &has_oat_class); 2452 if (has_oat_class) { 2453 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2454 } 2455 } 2456 if (!has_oat_class) { 2457 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2458 } 2459} 2460 2461void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2462 const byte* class_data, 2463 Handle<mirror::Class> klass, 2464 mirror::ClassLoader* class_loader, 2465 const OatFile::OatClass* oat_class) { 2466 // Load fields. 2467 ClassDataItemIterator it(dex_file, class_data); 2468 Thread* self = Thread::Current(); 2469 if (it.NumStaticFields() != 0) { 2470 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2471 if (UNLIKELY(statics == NULL)) { 2472 CHECK(self->IsExceptionPending()); // OOME. 2473 return; 2474 } 2475 klass->SetSFields(statics); 2476 } 2477 if (it.NumInstanceFields() != 0) { 2478 mirror::ObjectArray<mirror::ArtField>* fields = 2479 AllocArtFieldArray(self, it.NumInstanceFields()); 2480 if (UNLIKELY(fields == NULL)) { 2481 CHECK(self->IsExceptionPending()); // OOME. 2482 return; 2483 } 2484 klass->SetIFields(fields); 2485 } 2486 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2487 StackHandleScope<1> hs(self); 2488 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2489 if (UNLIKELY(sfield.Get() == NULL)) { 2490 CHECK(self->IsExceptionPending()); // OOME. 2491 return; 2492 } 2493 klass->SetStaticField(i, sfield.Get()); 2494 LoadField(dex_file, it, klass, sfield); 2495 } 2496 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2497 StackHandleScope<1> hs(self); 2498 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2499 if (UNLIKELY(ifield.Get() == NULL)) { 2500 CHECK(self->IsExceptionPending()); // OOME. 2501 return; 2502 } 2503 klass->SetInstanceField(i, ifield.Get()); 2504 LoadField(dex_file, it, klass, ifield); 2505 } 2506 2507 // Load methods. 2508 if (it.NumDirectMethods() != 0) { 2509 // TODO: append direct methods to class object 2510 mirror::ObjectArray<mirror::ArtMethod>* directs = 2511 AllocArtMethodArray(self, it.NumDirectMethods()); 2512 if (UNLIKELY(directs == NULL)) { 2513 CHECK(self->IsExceptionPending()); // OOME. 2514 return; 2515 } 2516 klass->SetDirectMethods(directs); 2517 } 2518 if (it.NumVirtualMethods() != 0) { 2519 // TODO: append direct methods to class object 2520 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2521 AllocArtMethodArray(self, it.NumVirtualMethods()); 2522 if (UNLIKELY(virtuals == NULL)) { 2523 CHECK(self->IsExceptionPending()); // OOME. 2524 return; 2525 } 2526 klass->SetVirtualMethods(virtuals); 2527 } 2528 size_t class_def_method_index = 0; 2529 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2530 StackHandleScope<1> hs(self); 2531 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2532 if (UNLIKELY(method.Get() == NULL)) { 2533 CHECK(self->IsExceptionPending()); // OOME. 2534 return; 2535 } 2536 klass->SetDirectMethod(i, method.Get()); 2537 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2538 method->SetMethodIndex(class_def_method_index); 2539 class_def_method_index++; 2540 } 2541 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2542 StackHandleScope<1> hs(self); 2543 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2544 if (UNLIKELY(method.Get() == NULL)) { 2545 CHECK(self->IsExceptionPending()); // OOME. 2546 return; 2547 } 2548 klass->SetVirtualMethod(i, method.Get()); 2549 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2550 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2551 class_def_method_index++; 2552 } 2553 DCHECK(!it.HasNext()); 2554} 2555 2556void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2557 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2558 uint32_t field_idx = it.GetMemberIndex(); 2559 dst->SetDexFieldIndex(field_idx); 2560 dst->SetDeclaringClass(klass.Get()); 2561 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2562} 2563 2564mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2565 const ClassDataItemIterator& it, 2566 Handle<mirror::Class> klass) { 2567 uint32_t dex_method_idx = it.GetMemberIndex(); 2568 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2569 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2570 2571 mirror::ArtMethod* dst = AllocArtMethod(self); 2572 if (UNLIKELY(dst == NULL)) { 2573 CHECK(self->IsExceptionPending()); // OOME. 2574 return NULL; 2575 } 2576 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2577 2578 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2579 dst->SetDexMethodIndex(dex_method_idx); 2580 dst->SetDeclaringClass(klass.Get()); 2581 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2582 2583 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2584 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2585 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2586 2587 uint32_t access_flags = it.GetMemberAccessFlags(); 2588 2589 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2590 // Set finalizable flag on declaring class. 2591 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2592 // Void return type. 2593 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged. 2594 klass->SetFinalizable(); 2595 } else { 2596 std::string temp; 2597 const char* klass_descriptor = klass->GetDescriptor(&temp); 2598 // The Enum class declares a "final" finalize() method to prevent subclasses from 2599 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2600 // subclasses, so we exclude it here. 2601 // We also want to avoid setting the flag on Object, where we know that finalize() is 2602 // empty. 2603 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2604 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2605 klass->SetFinalizable(); 2606 } 2607 } 2608 } 2609 } else if (method_name[0] == '<') { 2610 // Fix broken access flags for initializers. Bug 11157540. 2611 bool is_init = (strcmp("<init>", method_name) == 0); 2612 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2613 if (UNLIKELY(!is_init && !is_clinit)) { 2614 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2615 } else { 2616 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2617 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2618 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2619 access_flags |= kAccConstructor; 2620 } 2621 } 2622 } 2623 dst->SetAccessFlags(access_flags); 2624 2625 self->EndAssertNoThreadSuspension(old_cause); 2626 return dst; 2627} 2628 2629void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2630 Thread* self = Thread::Current(); 2631 StackHandleScope<1> hs(self); 2632 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2633 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2634 AppendToBootClassPath(dex_file, dex_cache); 2635} 2636 2637void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2638 Handle<mirror::DexCache> dex_cache) { 2639 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2640 boot_class_path_.push_back(&dex_file); 2641 RegisterDexFile(dex_file, dex_cache); 2642} 2643 2644bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2645 dex_lock_.AssertSharedHeld(Thread::Current()); 2646 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2647 mirror::DexCache* dex_cache = GetDexCache(i); 2648 if (dex_cache->GetDexFile() == &dex_file) { 2649 return true; 2650 } 2651 } 2652 return false; 2653} 2654 2655bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2656 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2657 return IsDexFileRegisteredLocked(dex_file); 2658} 2659 2660void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2661 Handle<mirror::DexCache> dex_cache) { 2662 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2663 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2664 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2665 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2666 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2667 dex_cache->SetDexFile(&dex_file); 2668 if (log_new_dex_caches_roots_) { 2669 // TODO: This is not safe if we can remove dex caches. 2670 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2671 } 2672} 2673 2674void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2675 Thread* self = Thread::Current(); 2676 { 2677 ReaderMutexLock mu(self, dex_lock_); 2678 if (IsDexFileRegisteredLocked(dex_file)) { 2679 return; 2680 } 2681 } 2682 // Don't alloc while holding the lock, since allocation may need to 2683 // suspend all threads and another thread may need the dex_lock_ to 2684 // get to a suspend point. 2685 StackHandleScope<1> hs(self); 2686 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2687 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2688 { 2689 WriterMutexLock mu(self, dex_lock_); 2690 if (IsDexFileRegisteredLocked(dex_file)) { 2691 return; 2692 } 2693 RegisterDexFileLocked(dex_file, dex_cache); 2694 } 2695} 2696 2697void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2698 Handle<mirror::DexCache> dex_cache) { 2699 WriterMutexLock mu(Thread::Current(), dex_lock_); 2700 RegisterDexFileLocked(dex_file, dex_cache); 2701} 2702 2703mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2704 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2705 // Search assuming unique-ness of dex file. 2706 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2707 mirror::DexCache* dex_cache = GetDexCache(i); 2708 if (dex_cache->GetDexFile() == &dex_file) { 2709 return dex_cache; 2710 } 2711 } 2712 // Search matching by location name. 2713 std::string location(dex_file.GetLocation()); 2714 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2715 mirror::DexCache* dex_cache = GetDexCache(i); 2716 if (dex_cache->GetDexFile()->GetLocation() == location) { 2717 return dex_cache; 2718 } 2719 } 2720 // Failure, dump diagnostic and abort. 2721 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2722 mirror::DexCache* dex_cache = GetDexCache(i); 2723 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2724 } 2725 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2726 return NULL; 2727} 2728 2729void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2730 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2731 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2732 mirror::DexCache* dex_cache = GetDexCache(i); 2733 dex_cache->Fixup(resolution_method); 2734 } 2735} 2736 2737mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2738 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 2739 if (UNLIKELY(klass == NULL)) { 2740 return NULL; 2741 } 2742 return InitializePrimitiveClass(klass, type); 2743} 2744 2745mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2746 Primitive::Type type) { 2747 CHECK(primitive_class != NULL); 2748 // Must hold lock on object when initializing. 2749 Thread* self = Thread::Current(); 2750 StackHandleScope<1> hs(self); 2751 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2752 ObjectLock<mirror::Class> lock(self, h_class); 2753 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2754 primitive_class->SetPrimitiveType(type); 2755 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2756 const char* descriptor = Primitive::Descriptor(type); 2757 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2758 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2759 return primitive_class; 2760} 2761 2762// Create an array class (i.e. the class object for the array, not the 2763// array itself). "descriptor" looks like "[C" or "[[[[B" or 2764// "[Ljava/lang/String;". 2765// 2766// If "descriptor" refers to an array of primitives, look up the 2767// primitive type's internally-generated class object. 2768// 2769// "class_loader" is the class loader of the class that's referring to 2770// us. It's used to ensure that we're looking for the element type in 2771// the right context. It does NOT become the class loader for the 2772// array class; that always comes from the base element class. 2773// 2774// Returns NULL with an exception raised on failure. 2775mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2776 Handle<mirror::ClassLoader> class_loader) { 2777 // Identify the underlying component type 2778 CHECK_EQ('[', descriptor[0]); 2779 StackHandleScope<2> hs(self); 2780 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2781 if (component_type.Get() == nullptr) { 2782 DCHECK(self->IsExceptionPending()); 2783 // We need to accept erroneous classes as component types. 2784 component_type.Assign(LookupClass(descriptor + 1, class_loader.Get())); 2785 if (component_type.Get() == nullptr) { 2786 DCHECK(self->IsExceptionPending()); 2787 return nullptr; 2788 } else { 2789 self->ClearException(); 2790 } 2791 } 2792 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2793 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2794 return nullptr; 2795 } 2796 // See if the component type is already loaded. Array classes are 2797 // always associated with the class loader of their underlying 2798 // element type -- an array of Strings goes with the loader for 2799 // java/lang/String -- so we need to look for it there. (The 2800 // caller should have checked for the existence of the class 2801 // before calling here, but they did so with *their* class loader, 2802 // not the component type's loader.) 2803 // 2804 // If we find it, the caller adds "loader" to the class' initiating 2805 // loader list, which should prevent us from going through this again. 2806 // 2807 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2808 // are the same, because our caller (FindClass) just did the 2809 // lookup. (Even if we get this wrong we still have correct behavior, 2810 // because we effectively do this lookup again when we add the new 2811 // class to the hash table --- necessary because of possible races with 2812 // other threads.) 2813 if (class_loader.Get() != component_type->GetClassLoader()) { 2814 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2815 if (new_class != NULL) { 2816 return new_class; 2817 } 2818 } 2819 2820 // Fill out the fields in the Class. 2821 // 2822 // It is possible to execute some methods against arrays, because 2823 // all arrays are subclasses of java_lang_Object_, so we need to set 2824 // up a vtable. We can just point at the one in java_lang_Object_. 2825 // 2826 // Array classes are simple enough that we don't need to do a full 2827 // link step. 2828 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2829 if (UNLIKELY(!init_done_)) { 2830 // Classes that were hand created, ie not by FindSystemClass 2831 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2832 new_class.Assign(GetClassRoot(kClassArrayClass)); 2833 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2834 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2835 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2836 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2837 } else if (strcmp(descriptor, 2838 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2839 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2840 } else if (strcmp(descriptor, 2841 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2842 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2843 } else if (strcmp(descriptor, "[C") == 0) { 2844 new_class.Assign(GetClassRoot(kCharArrayClass)); 2845 } else if (strcmp(descriptor, "[I") == 0) { 2846 new_class.Assign(GetClassRoot(kIntArrayClass)); 2847 } 2848 } 2849 if (new_class.Get() == nullptr) { 2850 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 2851 if (new_class.Get() == nullptr) { 2852 return nullptr; 2853 } 2854 new_class->SetComponentType(component_type.Get()); 2855 } 2856 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2857 DCHECK(new_class->GetComponentType() != NULL); 2858 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2859 new_class->SetSuperClass(java_lang_Object); 2860 new_class->SetVTable(java_lang_Object->GetVTable()); 2861 new_class->SetPrimitiveType(Primitive::kPrimNot); 2862 new_class->SetClassLoader(component_type->GetClassLoader()); 2863 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 2864 new_class->PopulateEmbeddedImtAndVTable(); 2865 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2866 // don't need to set new_class->SetObjectSize(..) 2867 // because Object::SizeOf delegates to Array::SizeOf 2868 2869 2870 // All arrays have java/lang/Cloneable and java/io/Serializable as 2871 // interfaces. We need to set that up here, so that stuff like 2872 // "instanceof" works right. 2873 // 2874 // Note: The GC could run during the call to FindSystemClass, 2875 // so we need to make sure the class object is GC-valid while we're in 2876 // there. Do this by clearing the interface list so the GC will just 2877 // think that the entries are null. 2878 2879 2880 // Use the single, global copies of "interfaces" and "iftable" 2881 // (remember not to free them for arrays). 2882 { 2883 mirror::IfTable* array_iftable = array_iftable_.Read(); 2884 CHECK(array_iftable != nullptr); 2885 new_class->SetIfTable(array_iftable); 2886 } 2887 2888 // Inherit access flags from the component type. 2889 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2890 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2891 access_flags &= kAccJavaFlagsMask; 2892 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2893 // and remove "interface". 2894 access_flags |= kAccAbstract | kAccFinal; 2895 access_flags &= ~kAccInterface; 2896 2897 new_class->SetAccessFlags(access_flags); 2898 2899 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2900 if (existing == nullptr) { 2901 return new_class.Get(); 2902 } 2903 // Another thread must have loaded the class after we 2904 // started but before we finished. Abandon what we've 2905 // done. 2906 // 2907 // (Yes, this happens.) 2908 2909 return existing; 2910} 2911 2912mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2913 switch (type) { 2914 case 'B': 2915 return GetClassRoot(kPrimitiveByte); 2916 case 'C': 2917 return GetClassRoot(kPrimitiveChar); 2918 case 'D': 2919 return GetClassRoot(kPrimitiveDouble); 2920 case 'F': 2921 return GetClassRoot(kPrimitiveFloat); 2922 case 'I': 2923 return GetClassRoot(kPrimitiveInt); 2924 case 'J': 2925 return GetClassRoot(kPrimitiveLong); 2926 case 'S': 2927 return GetClassRoot(kPrimitiveShort); 2928 case 'Z': 2929 return GetClassRoot(kPrimitiveBoolean); 2930 case 'V': 2931 return GetClassRoot(kPrimitiveVoid); 2932 default: 2933 break; 2934 } 2935 std::string printable_type(PrintableChar(type)); 2936 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2937 return NULL; 2938} 2939 2940mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2941 size_t hash) { 2942 if (VLOG_IS_ON(class_linker)) { 2943 mirror::DexCache* dex_cache = klass->GetDexCache(); 2944 std::string source; 2945 if (dex_cache != NULL) { 2946 source += " from "; 2947 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2948 } 2949 LOG(INFO) << "Loaded class " << descriptor << source; 2950 } 2951 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2952 mirror::Class* existing = 2953 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2954 if (existing != NULL) { 2955 return existing; 2956 } 2957 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == NULL && 2958 dex_cache_image_class_lookup_required_) { 2959 // Check a class loaded with the system class loader matches one in the image if the class 2960 // is in the image. 2961 existing = LookupClassFromImage(descriptor); 2962 if (existing != NULL) { 2963 CHECK(klass == existing); 2964 } 2965 } 2966 VerifyObject(klass); 2967 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 2968 if (log_new_class_table_roots_) { 2969 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 2970 } 2971 return NULL; 2972} 2973 2974mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 2975 size_t hash) { 2976 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2977 mirror::Class* existing = 2978 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2979 2980 if (existing == nullptr) { 2981 CHECK(klass->IsProxyClass()); 2982 return nullptr; 2983 } 2984 2985 CHECK_NE(existing, klass) << descriptor; 2986 CHECK(!existing->IsResolved()) << descriptor; 2987 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 2988 2989 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2990 ++it) { 2991 mirror::Class* klass = it->second.Read(); 2992 if (klass == existing) { 2993 class_table_.erase(it); 2994 break; 2995 } 2996 } 2997 2998 CHECK(!klass->IsTemp()) << descriptor; 2999 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 3000 dex_cache_image_class_lookup_required_) { 3001 // Check a class loaded with the system class loader matches one in the image if the class 3002 // is in the image. 3003 existing = LookupClassFromImage(descriptor); 3004 if (existing != nullptr) { 3005 CHECK(klass == existing) << descriptor; 3006 } 3007 } 3008 VerifyObject(klass); 3009 3010 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3011 if (log_new_class_table_roots_) { 3012 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3013 } 3014 3015 return existing; 3016} 3017 3018bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 3019 size_t hash = Hash(descriptor); 3020 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3021 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3022 it != end && it->first == hash; 3023 ++it) { 3024 mirror::Class* klass = it->second.Read(); 3025 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3026 class_table_.erase(it); 3027 return true; 3028 } 3029 } 3030 return false; 3031} 3032 3033mirror::Class* ClassLinker::LookupClass(const char* descriptor, 3034 const mirror::ClassLoader* class_loader) { 3035 size_t hash = Hash(descriptor); 3036 { 3037 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3038 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 3039 if (result != NULL) { 3040 return result; 3041 } 3042 } 3043 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 3044 return NULL; 3045 } else { 3046 // Lookup failed but need to search dex_caches_. 3047 mirror::Class* result = LookupClassFromImage(descriptor); 3048 if (result != NULL) { 3049 InsertClass(descriptor, result, hash); 3050 } else { 3051 // Searching the image dex files/caches failed, we don't want to get into this situation 3052 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 3053 // classes into the class table. 3054 const int32_t kMaxFailedDexCacheLookups = 1000; 3055 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3056 MoveImageClassesToClassTable(); 3057 } 3058 } 3059 return result; 3060 } 3061} 3062 3063mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3064 const mirror::ClassLoader* class_loader, 3065 size_t hash) { 3066 auto end = class_table_.end(); 3067 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3068 mirror::Class* klass = it->second.Read(); 3069 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3070 if (kIsDebugBuild) { 3071 // Check for duplicates in the table. 3072 for (++it; it != end && it->first == hash; ++it) { 3073 mirror::Class* klass2 = it->second.Read(); 3074 CHECK(!(klass2->GetClassLoader() == class_loader && 3075 klass2->DescriptorEquals(descriptor))) 3076 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3077 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3078 } 3079 } 3080 return klass; 3081 } 3082 } 3083 return NULL; 3084} 3085 3086static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3087 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3088 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3089 CHECK(image != NULL); 3090 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3091 return root->AsObjectArray<mirror::DexCache>(); 3092} 3093 3094void ClassLinker::MoveImageClassesToClassTable() { 3095 Thread* self = Thread::Current(); 3096 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3097 if (!dex_cache_image_class_lookup_required_) { 3098 return; // All dex cache classes are already in the class table. 3099 } 3100 const char* old_no_suspend_cause = 3101 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 3102 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3103 std::string temp; 3104 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3105 mirror::DexCache* dex_cache = dex_caches->Get(i); 3106 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3107 for (int32_t j = 0; j < types->GetLength(); j++) { 3108 mirror::Class* klass = types->Get(j); 3109 if (klass != NULL) { 3110 DCHECK(klass->GetClassLoader() == NULL); 3111 const char* descriptor = klass->GetDescriptor(&temp); 3112 size_t hash = Hash(descriptor); 3113 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 3114 if (existing != NULL) { 3115 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3116 << PrettyClassAndClassLoader(klass); 3117 } else { 3118 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3119 if (log_new_class_table_roots_) { 3120 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3121 } 3122 } 3123 } 3124 } 3125 } 3126 dex_cache_image_class_lookup_required_ = false; 3127 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3128} 3129 3130mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3131 Thread* self = Thread::Current(); 3132 const char* old_no_suspend_cause = 3133 self->StartAssertNoThreadSuspension("Image class lookup"); 3134 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3135 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3136 mirror::DexCache* dex_cache = dex_caches->Get(i); 3137 const DexFile* dex_file = dex_cache->GetDexFile(); 3138 // Try binary searching the string/type index. 3139 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3140 if (string_id != NULL) { 3141 const DexFile::TypeId* type_id = 3142 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3143 if (type_id != NULL) { 3144 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3145 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3146 if (klass != NULL) { 3147 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3148 return klass; 3149 } 3150 } 3151 } 3152 } 3153 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3154 return NULL; 3155} 3156 3157void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3158 result.clear(); 3159 if (dex_cache_image_class_lookup_required_) { 3160 MoveImageClassesToClassTable(); 3161 } 3162 size_t hash = Hash(descriptor); 3163 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3164 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3165 it != end && it->first == hash; ++it) { 3166 mirror::Class* klass = it->second.Read(); 3167 if (klass->DescriptorEquals(descriptor)) { 3168 result.push_back(klass); 3169 } 3170 } 3171} 3172 3173void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 3174 // TODO: assert that the monitor on the Class is held 3175 Thread* self = Thread::Current(); 3176 ObjectLock<mirror::Class> lock(self, klass); 3177 3178 // Don't attempt to re-verify if already sufficiently verified. 3179 if (klass->IsVerified() || 3180 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 3181 return; 3182 } 3183 3184 // The class might already be erroneous, for example at compile time if we attempted to verify 3185 // this class as a parent to another. 3186 if (klass->IsErroneous()) { 3187 ThrowEarlierClassFailure(klass.Get()); 3188 return; 3189 } 3190 3191 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3192 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3193 } else { 3194 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3195 << PrettyClass(klass.Get()); 3196 CHECK(!Runtime::Current()->IsCompiler()); 3197 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3198 } 3199 3200 // Skip verification if disabled. 3201 if (!Runtime::Current()->IsVerificationEnabled()) { 3202 klass->SetStatus(mirror::Class::kStatusVerified, self); 3203 return; 3204 } 3205 3206 // Verify super class. 3207 StackHandleScope<2> hs(self); 3208 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3209 if (super.Get() != NULL) { 3210 // Acquire lock to prevent races on verifying the super class. 3211 ObjectLock<mirror::Class> lock(self, super); 3212 3213 if (!super->IsVerified() && !super->IsErroneous()) { 3214 VerifyClass(super); 3215 } 3216 if (!super->IsCompileTimeVerified()) { 3217 std::string error_msg( 3218 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3219 PrettyDescriptor(klass.Get()).c_str(), 3220 PrettyDescriptor(super.Get()).c_str())); 3221 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3222 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3223 if (cause.Get() != nullptr) { 3224 self->ClearException(); 3225 } 3226 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3227 if (cause.Get() != nullptr) { 3228 self->GetException(nullptr)->SetCause(cause.Get()); 3229 } 3230 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3231 if (Runtime::Current()->IsCompiler()) { 3232 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3233 } 3234 klass->SetStatus(mirror::Class::kStatusError, self); 3235 return; 3236 } 3237 } 3238 3239 // Try to use verification information from the oat file, otherwise do runtime verification. 3240 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3241 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3242 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3243 if (oat_file_class_status == mirror::Class::kStatusError) { 3244 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3245 << PrettyDescriptor(klass.Get()) << " in " 3246 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3247 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3248 PrettyDescriptor(klass.Get()).c_str()); 3249 klass->SetStatus(mirror::Class::kStatusError, self); 3250 return; 3251 } 3252 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3253 std::string error_msg; 3254 if (!preverified) { 3255 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 3256 Runtime::Current()->IsCompiler(), 3257 &error_msg); 3258 } 3259 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3260 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3261 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3262 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3263 << " because: " << error_msg; 3264 } 3265 self->AssertNoPendingException(); 3266 // Make sure all classes referenced by catch blocks are resolved. 3267 ResolveClassExceptionHandlerTypes(dex_file, klass); 3268 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3269 // Even though there were no verifier failures we need to respect whether the super-class 3270 // was verified or requiring runtime reverification. 3271 if (super.Get() == NULL || super->IsVerified()) { 3272 klass->SetStatus(mirror::Class::kStatusVerified, self); 3273 } else { 3274 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3275 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3276 // Pretend a soft failure occured so that we don't consider the class verified below. 3277 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3278 } 3279 } else { 3280 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3281 // Soft failures at compile time should be retried at runtime. Soft 3282 // failures at runtime will be handled by slow paths in the generated 3283 // code. Set status accordingly. 3284 if (Runtime::Current()->IsCompiler()) { 3285 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3286 } else { 3287 klass->SetStatus(mirror::Class::kStatusVerified, self); 3288 } 3289 } 3290 } else { 3291 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3292 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3293 << " because: " << error_msg; 3294 self->AssertNoPendingException(); 3295 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3296 klass->SetStatus(mirror::Class::kStatusError, self); 3297 } 3298 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3299 // Class is verified so we don't need to do any access check on its methods. 3300 // Let the interpreter know it by setting the kAccPreverified flag onto each 3301 // method. 3302 // Note: we're going here during compilation and at runtime. When we set the 3303 // kAccPreverified flag when compiling image classes, the flag is recorded 3304 // in the image and is set when loading the image. 3305 klass->SetPreverifiedFlagOnAllMethods(); 3306 } 3307} 3308 3309bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3310 mirror::Class::Status& oat_file_class_status) { 3311 // If we're compiling, we can only verify the class using the oat file if 3312 // we are not compiling the image or if the class we're verifying is not part of 3313 // the app. In other words, we will only check for preverification of bootclasspath 3314 // classes. 3315 if (Runtime::Current()->IsCompiler()) { 3316 // Are we compiling the bootclasspath? 3317 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3318 return false; 3319 } 3320 // We are compiling an app (not the image). 3321 3322 // Is this an app class? (I.e. not a bootclasspath class) 3323 if (klass->GetClassLoader() != NULL) { 3324 return false; 3325 } 3326 } 3327 3328 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 3329 // Make this work with gtests, which do not set up the image properly. 3330 // TODO: we should clean up gtests to set up the image path properly. 3331 if (Runtime::Current()->IsCompiler() || (oat_file == NULL)) { 3332 return false; 3333 } 3334 3335 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3336 uint dex_location_checksum = dex_file.GetLocationChecksum(); 3337 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 3338 &dex_location_checksum); 3339 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3340 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3341 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3342 if (oat_file_class_status == mirror::Class::kStatusVerified || 3343 oat_file_class_status == mirror::Class::kStatusInitialized) { 3344 return true; 3345 } 3346 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3347 // Compile time verification failed with a soft error. Compile time verification can fail 3348 // because we have incomplete type information. Consider the following: 3349 // class ... { 3350 // Foo x; 3351 // .... () { 3352 // if (...) { 3353 // v1 gets assigned a type of resolved class Foo 3354 // } else { 3355 // v1 gets assigned a type of unresolved class Bar 3356 // } 3357 // iput x = v1 3358 // } } 3359 // when we merge v1 following the if-the-else it results in Conflict 3360 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3361 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3362 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3363 // at compile time). 3364 return false; 3365 } 3366 if (oat_file_class_status == mirror::Class::kStatusError) { 3367 // Compile time verification failed with a hard error. This is caused by invalid instructions 3368 // in the class. These errors are unrecoverable. 3369 return false; 3370 } 3371 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3372 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3373 // not loading the class. 3374 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3375 // isn't a problem and this case shouldn't occur 3376 return false; 3377 } 3378 std::string temp; 3379 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3380 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3381 << klass->GetDescriptor(&temp); 3382 3383 return false; 3384} 3385 3386void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3387 Handle<mirror::Class> klass) { 3388 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3389 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3390 } 3391 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3392 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3393 } 3394} 3395 3396void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3397 mirror::ArtMethod* method) { 3398 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3399 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3400 if (code_item == NULL) { 3401 return; // native or abstract method 3402 } 3403 if (code_item->tries_size_ == 0) { 3404 return; // nothing to process 3405 } 3406 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3407 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3408 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3409 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3410 CatchHandlerIterator iterator(handlers_ptr); 3411 for (; iterator.HasNext(); iterator.Next()) { 3412 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3413 // unresolved exception types will be ignored by exception delivery 3414 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3415 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3416 if (exception_type == NULL) { 3417 DCHECK(Thread::Current()->IsExceptionPending()); 3418 Thread::Current()->ClearException(); 3419 } 3420 } 3421 } 3422 handlers_ptr = iterator.EndDataPointer(); 3423 } 3424} 3425 3426static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3427static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3428 Handle<mirror::ArtMethod> prototype); 3429 3430mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3431 jobjectArray interfaces, jobject loader, 3432 jobjectArray methods, jobjectArray throws) { 3433 Thread* self = soa.Self(); 3434 StackHandleScope<8> hs(self); 3435 Handle<mirror::Class> klass(hs.NewHandle( 3436 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3437 if (klass.Get() == NULL) { 3438 CHECK(self->IsExceptionPending()); // OOME. 3439 return NULL; 3440 } 3441 DCHECK(klass->GetClass() != NULL); 3442 klass->SetObjectSize(sizeof(mirror::Proxy)); 3443 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 3444 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3445 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3446 klass->SetName(soa.Decode<mirror::String*>(name)); 3447 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3448 klass->SetDexCache(proxy_class->GetDexCache()); 3449 klass->SetStatus(mirror::Class::kStatusIdx, self); 3450 3451 // Instance fields are inherited, but we add a couple of static fields... 3452 { 3453 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3454 if (UNLIKELY(sfields == NULL)) { 3455 CHECK(self->IsExceptionPending()); // OOME. 3456 return NULL; 3457 } 3458 klass->SetSFields(sfields); 3459 } 3460 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3461 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3462 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3463 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3464 CHECK(self->IsExceptionPending()); // OOME. 3465 return nullptr; 3466 } 3467 klass->SetStaticField(0, interfaces_sfield.Get()); 3468 interfaces_sfield->SetDexFieldIndex(0); 3469 interfaces_sfield->SetDeclaringClass(klass.Get()); 3470 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3471 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3472 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3473 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3474 CHECK(self->IsExceptionPending()); // OOME. 3475 return nullptr; 3476 } 3477 klass->SetStaticField(1, throws_sfield.Get()); 3478 throws_sfield->SetDexFieldIndex(1); 3479 throws_sfield->SetDeclaringClass(klass.Get()); 3480 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3481 3482 // Proxies have 1 direct method, the constructor 3483 { 3484 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3485 if (UNLIKELY(directs == nullptr)) { 3486 CHECK(self->IsExceptionPending()); // OOME. 3487 return nullptr; 3488 } 3489 klass->SetDirectMethods(directs); 3490 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3491 if (UNLIKELY(constructor == nullptr)) { 3492 CHECK(self->IsExceptionPending()); // OOME. 3493 return nullptr; 3494 } 3495 klass->SetDirectMethod(0, constructor); 3496 } 3497 3498 // Create virtual method using specified prototypes. 3499 size_t num_virtual_methods = 3500 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3501 { 3502 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3503 num_virtual_methods); 3504 if (UNLIKELY(virtuals == NULL)) { 3505 CHECK(self->IsExceptionPending()); // OOME. 3506 return NULL; 3507 } 3508 klass->SetVirtualMethods(virtuals); 3509 } 3510 for (size_t i = 0; i < num_virtual_methods; ++i) { 3511 StackHandleScope<1> hs(self); 3512 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3513 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3514 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3515 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3516 if (UNLIKELY(clone == nullptr)) { 3517 CHECK(self->IsExceptionPending()); // OOME. 3518 return nullptr; 3519 } 3520 klass->SetVirtualMethod(i, clone); 3521 } 3522 3523 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3524 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3525 self->AssertNoPendingException(); 3526 3527 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3528 mirror::Class* new_class = nullptr; 3529 { 3530 ObjectLock<mirror::Class> resolution_lock(self, klass); // Must hold lock on object when resolved. 3531 // Link the fields and virtual methods, creating vtable and iftables 3532 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3533 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3534 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3535 klass->SetStatus(mirror::Class::kStatusError, self); 3536 return nullptr; 3537 } 3538 } 3539 3540 CHECK(klass->IsRetired()); 3541 CHECK_NE(klass.Get(), new_class); 3542 klass.Assign(new_class); 3543 3544 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3545 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3546 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3547 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3548 3549 { 3550 // Lock on klass is released. Lock new class object. 3551 ObjectLock<mirror::Class> initialization_lock(self, klass); 3552 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3553 } 3554 3555 // sanity checks 3556 if (kIsDebugBuild) { 3557 CHECK(klass->GetIFields() == nullptr); 3558 CheckProxyConstructor(klass->GetDirectMethod(0)); 3559 for (size_t i = 0; i < num_virtual_methods; ++i) { 3560 StackHandleScope<2> hs(self); 3561 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3562 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3563 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3564 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3565 CheckProxyMethod(virtual_method, prototype); 3566 } 3567 3568 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3569 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3570 decoded_name->ToModifiedUtf8().c_str())); 3571 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3572 3573 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3574 decoded_name->ToModifiedUtf8().c_str())); 3575 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3576 3577 CHECK_EQ(klass.Get()->GetInterfaces(), 3578 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3579 CHECK_EQ(klass.Get()->GetThrows(), 3580 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3581 } 3582 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3583 CHECK(existing == nullptr); 3584 return klass.Get(); 3585} 3586 3587std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3588 DCHECK(proxy_class->IsProxyClass()); 3589 mirror::String* name = proxy_class->GetName(); 3590 DCHECK(name != NULL); 3591 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3592} 3593 3594mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3595 mirror::ArtMethod* proxy_method) { 3596 DCHECK(proxy_class->IsProxyClass()); 3597 DCHECK(proxy_method->IsProxyMethod()); 3598 // Locate the dex cache of the original interface/Object 3599 mirror::DexCache* dex_cache = nullptr; 3600 { 3601 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3602 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3603 mirror::DexCache* a_dex_cache = GetDexCache(i); 3604 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3605 dex_cache = a_dex_cache; 3606 break; 3607 } 3608 } 3609 } 3610 CHECK(dex_cache != nullptr); 3611 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3612 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3613 CHECK(resolved_method != nullptr); 3614 return resolved_method; 3615} 3616 3617 3618mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3619 Handle<mirror::Class> klass, 3620 mirror::Class* proxy_class) { 3621 // Create constructor for Proxy that must initialize h 3622 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3623 proxy_class->GetDirectMethods(); 3624 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3625 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3626 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3627 // code_ too) 3628 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3629 if (constructor == nullptr) { 3630 CHECK(self->IsExceptionPending()); // OOME. 3631 return nullptr; 3632 } 3633 // Make this constructor public and fix the class to be our Proxy version 3634 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3635 constructor->SetDeclaringClass(klass.Get()); 3636 return constructor; 3637} 3638 3639static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3640 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3641 CHECK(constructor->IsConstructor()); 3642 CHECK_STREQ(constructor->GetName(), "<init>"); 3643 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3644 "(Ljava/lang/reflect/InvocationHandler;)V"); 3645 DCHECK(constructor->IsPublic()); 3646} 3647 3648mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3649 Handle<mirror::Class> klass, 3650 Handle<mirror::ArtMethod> prototype) { 3651 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3652 // prototype method 3653 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3654 prototype.Get()); 3655 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3656 // as necessary 3657 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3658 if (UNLIKELY(method == NULL)) { 3659 CHECK(self->IsExceptionPending()); // OOME. 3660 return NULL; 3661 } 3662 3663 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3664 // the intersection of throw exceptions as defined in Proxy 3665 method->SetDeclaringClass(klass.Get()); 3666 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3667 3668 // At runtime the method looks like a reference and argument saving method, clone the code 3669 // related parameters from this method. 3670 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3671 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3672 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3673 3674 return method; 3675} 3676 3677static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3678 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3679 // Basic sanity 3680 CHECK(!prototype->IsFinal()); 3681 CHECK(method->IsFinal()); 3682 CHECK(!method->IsAbstract()); 3683 3684 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3685 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3686 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3687 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 3688 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 3689 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3690 3691 MethodHelper mh(method); 3692 MethodHelper mh2(prototype); 3693 CHECK_STREQ(method->GetName(), prototype->GetName()); 3694 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3695 // More complex sanity - via dex cache 3696 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3697} 3698 3699static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3700 bool can_init_parents) 3701 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3702 if (can_init_statics && can_init_parents) { 3703 return true; 3704 } 3705 if (!can_init_statics) { 3706 // Check if there's a class initializer. 3707 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3708 if (clinit != NULL) { 3709 return false; 3710 } 3711 // Check if there are encoded static values needing initialization. 3712 if (klass->NumStaticFields() != 0) { 3713 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3714 DCHECK(dex_class_def != NULL); 3715 if (dex_class_def->static_values_off_ != 0) { 3716 return false; 3717 } 3718 } 3719 } 3720 if (!klass->IsInterface() && klass->HasSuperClass()) { 3721 mirror::Class* super_class = klass->GetSuperClass(); 3722 if (!can_init_parents && !super_class->IsInitialized()) { 3723 return false; 3724 } else { 3725 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3726 return false; 3727 } 3728 } 3729 } 3730 return true; 3731} 3732 3733bool ClassLinker::IsInitialized() const { 3734 return init_done_; 3735} 3736 3737bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3738 bool can_init_parents) { 3739 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3740 3741 // Are we already initialized and therefore done? 3742 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3743 // an initialized class will never change its state. 3744 if (klass->IsInitialized()) { 3745 return true; 3746 } 3747 3748 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3749 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3750 return false; 3751 } 3752 3753 Thread* self = Thread::Current(); 3754 uint64_t t0; 3755 { 3756 ObjectLock<mirror::Class> lock(self, klass); 3757 3758 // Re-check under the lock in case another thread initialized ahead of us. 3759 if (klass->IsInitialized()) { 3760 return true; 3761 } 3762 3763 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3764 if (klass->IsErroneous()) { 3765 ThrowEarlierClassFailure(klass.Get()); 3766 return false; 3767 } 3768 3769 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3770 3771 if (!klass->IsVerified()) { 3772 VerifyClass(klass); 3773 if (!klass->IsVerified()) { 3774 // We failed to verify, expect either the klass to be erroneous or verification failed at 3775 // compile time. 3776 if (klass->IsErroneous()) { 3777 CHECK(self->IsExceptionPending()); 3778 } else { 3779 CHECK(Runtime::Current()->IsCompiler()); 3780 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3781 } 3782 return false; 3783 } 3784 } 3785 3786 // If the class is kStatusInitializing, either this thread is 3787 // initializing higher up the stack or another thread has beat us 3788 // to initializing and we need to wait. Either way, this 3789 // invocation of InitializeClass will not be responsible for 3790 // running <clinit> and will return. 3791 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3792 // We caught somebody else in the act; was it us? 3793 if (klass->GetClinitThreadId() == self->GetTid()) { 3794 // Yes. That's fine. Return so we can continue initializing. 3795 return true; 3796 } 3797 // No. That's fine. Wait for another thread to finish initializing. 3798 return WaitForInitializeClass(klass, self, lock); 3799 } 3800 3801 if (!ValidateSuperClassDescriptors(klass)) { 3802 klass->SetStatus(mirror::Class::kStatusError, self); 3803 return false; 3804 } 3805 3806 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3807 3808 // From here out other threads may observe that we're initializing and so changes of state 3809 // require the a notification. 3810 klass->SetClinitThreadId(self->GetTid()); 3811 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3812 3813 t0 = NanoTime(); 3814 } 3815 3816 // Initialize super classes, must be done while initializing for the JLS. 3817 if (!klass->IsInterface() && klass->HasSuperClass()) { 3818 mirror::Class* super_class = klass->GetSuperClass(); 3819 if (!super_class->IsInitialized()) { 3820 CHECK(!super_class->IsInterface()); 3821 CHECK(can_init_parents); 3822 StackHandleScope<1> hs(self); 3823 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3824 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3825 if (!super_initialized) { 3826 // The super class was verified ahead of entering initializing, we should only be here if 3827 // the super class became erroneous due to initialization. 3828 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3829 << "Super class initialization failed for " 3830 << PrettyDescriptor(handle_scope_super.Get()) 3831 << " that has unexpected status " << handle_scope_super->GetStatus() 3832 << "\nPending exception:\n" 3833 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3834 ObjectLock<mirror::Class> lock(self, klass); 3835 // Initialization failed because the super-class is erroneous. 3836 klass->SetStatus(mirror::Class::kStatusError, self); 3837 return false; 3838 } 3839 } 3840 } 3841 3842 if (klass->NumStaticFields() > 0) { 3843 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3844 CHECK(dex_class_def != NULL); 3845 const DexFile& dex_file = klass->GetDexFile(); 3846 StackHandleScope<3> hs(self); 3847 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3848 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3849 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3850 this, *dex_class_def); 3851 if (it.HasNext()) { 3852 CHECK(can_init_statics); 3853 // We reordered the fields, so we need to be able to map the 3854 // field indexes to the right fields. 3855 Handle<mirror::ObjectArray<mirror::ArtField>> 3856 field_array(hs.NewHandle(AllocArtFieldArray(self, klass->NumStaticFields()))); 3857 ConstructFieldArray(dex_file, *dex_class_def, klass.Get(), field_array); 3858 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3859 StackHandleScope<1> hs(self); 3860 Handle<mirror::ArtField> field(hs.NewHandle(field_array->Get(i))); 3861 if (Runtime::Current()->IsActiveTransaction()) { 3862 it.ReadValueToField<true>(field); 3863 } else { 3864 it.ReadValueToField<false>(field); 3865 } 3866 } 3867 } 3868 } 3869 3870 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3871 if (clinit != NULL) { 3872 CHECK(can_init_statics); 3873 JValue result; 3874 clinit->Invoke(self, NULL, 0, &result, "V"); 3875 } 3876 3877 uint64_t t1 = NanoTime(); 3878 3879 bool success = true; 3880 { 3881 ObjectLock<mirror::Class> lock(self, klass); 3882 3883 if (self->IsExceptionPending()) { 3884 WrapExceptionInInitializer(); 3885 klass->SetStatus(mirror::Class::kStatusError, self); 3886 success = false; 3887 } else { 3888 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3889 RuntimeStats* thread_stats = self->GetStats(); 3890 ++global_stats->class_init_count; 3891 ++thread_stats->class_init_count; 3892 global_stats->class_init_time_ns += (t1 - t0); 3893 thread_stats->class_init_time_ns += (t1 - t0); 3894 // Set the class as initialized except if failed to initialize static fields. 3895 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3896 if (VLOG_IS_ON(class_linker)) { 3897 std::string temp; 3898 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 3899 klass->GetLocation(); 3900 } 3901 // Opportunistically set static method trampolines to their destination. 3902 FixupStaticTrampolines(klass.Get()); 3903 } 3904 } 3905 return success; 3906} 3907 3908bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3909 ObjectLock<mirror::Class>& lock) 3910 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3911 while (true) { 3912 self->AssertNoPendingException(); 3913 CHECK(!klass->IsInitialized()); 3914 lock.WaitIgnoringInterrupts(); 3915 3916 // When we wake up, repeat the test for init-in-progress. If 3917 // there's an exception pending (only possible if 3918 // "interruptShouldThrow" was set), bail out. 3919 if (self->IsExceptionPending()) { 3920 WrapExceptionInInitializer(); 3921 klass->SetStatus(mirror::Class::kStatusError, self); 3922 return false; 3923 } 3924 // Spurious wakeup? Go back to waiting. 3925 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3926 continue; 3927 } 3928 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3929 // Compile time initialization failed. 3930 return false; 3931 } 3932 if (klass->IsErroneous()) { 3933 // The caller wants an exception, but it was thrown in a 3934 // different thread. Synthesize one here. 3935 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3936 PrettyDescriptor(klass.Get()).c_str()); 3937 return false; 3938 } 3939 if (klass->IsInitialized()) { 3940 return true; 3941 } 3942 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 3943 << klass->GetStatus(); 3944 } 3945 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 3946} 3947 3948bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 3949 if (klass->IsInterface()) { 3950 return true; 3951 } 3952 // Begin with the methods local to the superclass. 3953 StackHandleScope<2> hs(Thread::Current()); 3954 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3955 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3956 if (klass->HasSuperClass() && 3957 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3958 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 3959 mh.ChangeMethod(klass->GetVTableEntry(i)); 3960 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 3961 if (mh.GetMethod() != super_mh.GetMethod() && 3962 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3963 ThrowLinkageError(klass.Get(), 3964 "Class %s method %s resolves differently in superclass %s", 3965 PrettyDescriptor(klass.Get()).c_str(), 3966 PrettyMethod(mh.GetMethod()).c_str(), 3967 PrettyDescriptor(klass->GetSuperClass()).c_str()); 3968 return false; 3969 } 3970 } 3971 } 3972 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3973 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 3974 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 3975 for (uint32_t j = 0; j < num_methods; ++j) { 3976 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 3977 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 3978 if (mh.GetMethod() != super_mh.GetMethod() && 3979 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3980 ThrowLinkageError(klass.Get(), 3981 "Class %s method %s resolves differently in interface %s", 3982 PrettyDescriptor(klass.Get()).c_str(), 3983 PrettyMethod(mh.GetMethod()).c_str(), 3984 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 3985 return false; 3986 } 3987 } 3988 } 3989 } 3990 return true; 3991} 3992 3993bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 3994 bool can_init_parents) { 3995 DCHECK(c.Get() != nullptr); 3996 const bool success = c->IsInitialized() || InitializeClass(c, can_init_fields, can_init_parents); 3997 if (!success && can_init_fields && can_init_parents) { 3998 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.Get()); 3999 } 4000 return success; 4001} 4002 4003void ClassLinker::ConstructFieldArray(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 4004 mirror::Class* c, 4005 Handle<mirror::ObjectArray<mirror::ArtField>> field_array) { 4006 const byte* class_data = dex_file.GetClassData(dex_class_def); 4007 ClassDataItemIterator it(dex_file, class_data); 4008 StackHandleScope<2> hs(Thread::Current()); 4009 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 4010 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 4011 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 4012 if (Runtime::Current()->IsActiveTransaction()) { 4013 field_array->Set<true>(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 4014 } else { 4015 field_array->Set<false>(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 4016 } 4017 } 4018} 4019 4020void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 4021 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 4022 if (fields != nullptr) { 4023 for (int index = 0; index < fields->GetLength(); index ++) { 4024 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4025 fields->Get(index)->SetDeclaringClass(new_class); 4026 } 4027 } 4028 } 4029 4030 fields = new_class->GetSFields(); 4031 if (fields != nullptr) { 4032 for (int index = 0; index < fields->GetLength(); index ++) { 4033 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 4034 fields->Get(index)->SetDeclaringClass(new_class); 4035 } 4036 } 4037 } 4038 4039 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 4040 if (methods != nullptr) { 4041 for (int index = 0; index < methods->GetLength(); index ++) { 4042 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4043 methods->Get(index)->SetDeclaringClass(new_class); 4044 } 4045 } 4046 } 4047 4048 methods = new_class->GetVirtualMethods(); 4049 if (methods != nullptr) { 4050 for (int index = 0; index < methods->GetLength(); index ++) { 4051 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 4052 methods->Get(index)->SetDeclaringClass(new_class); 4053 } 4054 } 4055 } 4056} 4057 4058bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4059 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4060 mirror::Class** new_class) { 4061 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4062 4063 if (!LinkSuperClass(klass)) { 4064 return false; 4065 } 4066 if (!LinkMethods(self, klass, interfaces)) { 4067 return false; 4068 } 4069 if (!LinkInstanceFields(klass)) { 4070 return false; 4071 } 4072 size_t class_size; 4073 if (!LinkStaticFields(klass, &class_size)) { 4074 return false; 4075 } 4076 CreateReferenceInstanceOffsets(klass); 4077 CreateReferenceStaticOffsets(klass); 4078 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4079 4080 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4081 // We don't need to retire this class as it has no embedded tables or it was created the 4082 // correct size during class linker initialization. 4083 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4084 4085 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4086 klass->PopulateEmbeddedImtAndVTable(); 4087 } 4088 4089 // This will notify waiters on klass that saw the not yet resolved 4090 // class in the class_table_ during EnsureResolved. 4091 klass->SetStatus(mirror::Class::kStatusResolved, self); 4092 *new_class = klass.Get(); 4093 } else { 4094 CHECK(!klass->IsResolved()); 4095 // Retire the temporary class and create the correctly sized resolved class. 4096 *new_class = klass->CopyOf(self, class_size); 4097 if (UNLIKELY(*new_class == NULL)) { 4098 CHECK(self->IsExceptionPending()); // Expect an OOME. 4099 klass->SetStatus(mirror::Class::kStatusError, self); 4100 return false; 4101 } 4102 4103 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4104 StackHandleScope<1> hs(self); 4105 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4106 ObjectLock<mirror::Class> lock(self, new_class_h); 4107 4108 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4109 4110 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4111 CHECK(existing == NULL || existing == klass.Get()); 4112 4113 // This will notify waiters on temp class that saw the not yet resolved class in the 4114 // class_table_ during EnsureResolved. 4115 klass->SetStatus(mirror::Class::kStatusRetired, self); 4116 4117 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4118 // This will notify waiters on new_class that saw the not yet resolved 4119 // class in the class_table_ during EnsureResolved. 4120 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4121 } 4122 return true; 4123} 4124 4125bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4126 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4127 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4128 uint16_t super_class_idx = class_def.superclass_idx_; 4129 if (super_class_idx != DexFile::kDexNoIndex16) { 4130 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4131 if (super_class == NULL) { 4132 DCHECK(Thread::Current()->IsExceptionPending()); 4133 return false; 4134 } 4135 // Verify 4136 if (!klass->CanAccess(super_class)) { 4137 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4138 PrettyDescriptor(super_class).c_str(), 4139 PrettyDescriptor(klass.Get()).c_str()); 4140 return false; 4141 } 4142 CHECK(super_class->IsResolved()); 4143 klass->SetSuperClass(super_class); 4144 } 4145 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4146 if (interfaces != NULL) { 4147 for (size_t i = 0; i < interfaces->Size(); i++) { 4148 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4149 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4150 if (interface == NULL) { 4151 DCHECK(Thread::Current()->IsExceptionPending()); 4152 return false; 4153 } 4154 // Verify 4155 if (!klass->CanAccess(interface)) { 4156 // TODO: the RI seemed to ignore this in my testing. 4157 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4158 PrettyDescriptor(interface).c_str(), 4159 PrettyDescriptor(klass.Get()).c_str()); 4160 return false; 4161 } 4162 } 4163 } 4164 // Mark the class as loaded. 4165 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 4166 return true; 4167} 4168 4169bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4170 CHECK(!klass->IsPrimitive()); 4171 mirror::Class* super = klass->GetSuperClass(); 4172 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4173 if (super != NULL) { 4174 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4175 return false; 4176 } 4177 return true; 4178 } 4179 if (super == NULL) { 4180 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4181 PrettyDescriptor(klass.Get()).c_str()); 4182 return false; 4183 } 4184 // Verify 4185 if (super->IsFinal() || super->IsInterface()) { 4186 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4187 PrettyDescriptor(super).c_str(), 4188 PrettyDescriptor(klass.Get()).c_str(), 4189 super->IsFinal() ? "declared final" : "an interface"); 4190 return false; 4191 } 4192 if (!klass->CanAccess(super)) { 4193 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4194 PrettyDescriptor(super).c_str(), 4195 PrettyDescriptor(klass.Get()).c_str()); 4196 return false; 4197 } 4198 4199 // Inherit kAccClassIsFinalizable from the superclass in case this 4200 // class doesn't override finalize. 4201 if (super->IsFinalizable()) { 4202 klass->SetFinalizable(); 4203 } 4204 4205 // Inherit reference flags (if any) from the superclass. 4206 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4207 if (reference_flags != 0) { 4208 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4209 } 4210 // Disallow custom direct subclasses of java.lang.ref.Reference. 4211 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4212 ThrowLinkageError(klass.Get(), 4213 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4214 PrettyDescriptor(klass.Get()).c_str()); 4215 return false; 4216 } 4217 4218 if (kIsDebugBuild) { 4219 // Ensure super classes are fully resolved prior to resolving fields.. 4220 while (super != NULL) { 4221 CHECK(super->IsResolved()); 4222 super = super->GetSuperClass(); 4223 } 4224 } 4225 return true; 4226} 4227 4228// Populate the class vtable and itable. Compute return type indices. 4229bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4230 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4231 if (klass->IsInterface()) { 4232 // No vtable. 4233 size_t count = klass->NumVirtualMethods(); 4234 if (!IsUint(16, count)) { 4235 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4236 return false; 4237 } 4238 for (size_t i = 0; i < count; ++i) { 4239 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4240 } 4241 // Link interface method tables 4242 return LinkInterfaceMethods(klass, interfaces); 4243 } else { 4244 // Link virtual and interface method tables 4245 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4246 } 4247 return true; 4248} 4249 4250bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4251 if (klass->HasSuperClass()) { 4252 uint32_t max_count = klass->NumVirtualMethods() + 4253 klass->GetSuperClass()->GetVTableLength(); 4254 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4255 CHECK_LE(actual_count, max_count); 4256 StackHandleScope<4> hs(self); 4257 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4258 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4259 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4260 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4261 if (UNLIKELY(vtable.Get() == nullptr)) { 4262 CHECK(self->IsExceptionPending()); // OOME. 4263 return false; 4264 } 4265 int len = super_class->GetVTableLength(); 4266 for (int i = 0; i < len; i++) { 4267 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4268 } 4269 } else { 4270 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4271 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4272 if (UNLIKELY(vtable.Get() == nullptr)) { 4273 CHECK(self->IsExceptionPending()); // OOME. 4274 return false; 4275 } 4276 } 4277 4278 // See if any of our virtual methods override the superclass. 4279 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4280 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4281 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4282 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4283 local_mh.ChangeMethod(local_method); 4284 size_t j = 0; 4285 for (; j < actual_count; ++j) { 4286 mirror::ArtMethod* super_method = vtable->Get(j); 4287 super_mh.ChangeMethod(super_method); 4288 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4289 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4290 super_method->GetAccessFlags())) { 4291 if (super_method->IsFinal()) { 4292 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4293 PrettyMethod(local_method).c_str(), 4294 super_method->GetDeclaringClassDescriptor()); 4295 return false; 4296 } 4297 vtable->Set<false>(j, local_method); 4298 local_method->SetMethodIndex(j); 4299 break; 4300 } else { 4301 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4302 << " would have incorrectly overridden the package-private method in " 4303 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4304 } 4305 } 4306 } 4307 if (j == actual_count) { 4308 // Not overriding, append. 4309 vtable->Set<false>(actual_count, local_method); 4310 local_method->SetMethodIndex(actual_count); 4311 actual_count += 1; 4312 } 4313 } 4314 if (!IsUint(16, actual_count)) { 4315 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4316 return false; 4317 } 4318 // Shrink vtable if possible 4319 CHECK_LE(actual_count, max_count); 4320 if (actual_count < max_count) { 4321 vtable.Assign(vtable->CopyOf(self, actual_count)); 4322 if (UNLIKELY(vtable.Get() == NULL)) { 4323 CHECK(self->IsExceptionPending()); // OOME. 4324 return false; 4325 } 4326 } 4327 klass->SetVTable(vtable.Get()); 4328 } else { 4329 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4330 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4331 if (!IsUint(16, num_virtual_methods)) { 4332 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4333 return false; 4334 } 4335 StackHandleScope<1> hs(self); 4336 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4337 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4338 if (UNLIKELY(vtable.Get() == NULL)) { 4339 CHECK(self->IsExceptionPending()); // OOME. 4340 return false; 4341 } 4342 for (size_t i = 0; i < num_virtual_methods; ++i) { 4343 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4344 vtable->Set<false>(i, virtual_method); 4345 virtual_method->SetMethodIndex(i & 0xFFFF); 4346 } 4347 klass->SetVTable(vtable.Get()); 4348 } 4349 return true; 4350} 4351 4352bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 4353 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4354 Thread* const self = Thread::Current(); 4355 Runtime* const runtime = Runtime::Current(); 4356 // Set the imt table to be all conflicts by default. 4357 klass->SetImTable(runtime->GetDefaultImt()); 4358 size_t super_ifcount; 4359 if (klass->HasSuperClass()) { 4360 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4361 } else { 4362 super_ifcount = 0; 4363 } 4364 uint32_t num_interfaces = 4365 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4366 size_t ifcount = super_ifcount + num_interfaces; 4367 for (size_t i = 0; i < num_interfaces; i++) { 4368 mirror::Class* interface = 4369 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4370 interfaces->Get(i); 4371 ifcount += interface->GetIfTableCount(); 4372 } 4373 if (ifcount == 0) { 4374 // Class implements no interfaces. 4375 DCHECK_EQ(klass->GetIfTableCount(), 0); 4376 DCHECK(klass->GetIfTable() == NULL); 4377 return true; 4378 } 4379 if (ifcount == super_ifcount) { 4380 // Class implements same interfaces as parent, are any of these not marker interfaces? 4381 bool has_non_marker_interface = false; 4382 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4383 for (size_t i = 0; i < ifcount; ++i) { 4384 if (super_iftable->GetMethodArrayCount(i) > 0) { 4385 has_non_marker_interface = true; 4386 break; 4387 } 4388 } 4389 if (!has_non_marker_interface) { 4390 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4391 klass->SetIfTable(super_iftable); 4392 return true; 4393 } 4394 } 4395 StackHandleScope<5> hs(self); 4396 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4397 if (UNLIKELY(iftable.Get() == NULL)) { 4398 CHECK(self->IsExceptionPending()); // OOME. 4399 return false; 4400 } 4401 if (super_ifcount != 0) { 4402 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4403 for (size_t i = 0; i < super_ifcount; i++) { 4404 mirror::Class* super_interface = super_iftable->GetInterface(i); 4405 iftable->SetInterface(i, super_interface); 4406 } 4407 } 4408 // Flatten the interface inheritance hierarchy. 4409 size_t idx = super_ifcount; 4410 for (size_t i = 0; i < num_interfaces; i++) { 4411 mirror::Class* interface = 4412 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4413 interfaces->Get(i); 4414 DCHECK(interface != NULL); 4415 if (!interface->IsInterface()) { 4416 std::string temp; 4417 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4418 PrettyDescriptor(klass.Get()).c_str(), 4419 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4420 return false; 4421 } 4422 // Check if interface is already in iftable 4423 bool duplicate = false; 4424 for (size_t j = 0; j < idx; j++) { 4425 mirror::Class* existing_interface = iftable->GetInterface(j); 4426 if (existing_interface == interface) { 4427 duplicate = true; 4428 break; 4429 } 4430 } 4431 if (!duplicate) { 4432 // Add this non-duplicate interface. 4433 iftable->SetInterface(idx++, interface); 4434 // Add this interface's non-duplicate super-interfaces. 4435 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4436 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4437 bool super_duplicate = false; 4438 for (size_t k = 0; k < idx; k++) { 4439 mirror::Class* existing_interface = iftable->GetInterface(k); 4440 if (existing_interface == super_interface) { 4441 super_duplicate = true; 4442 break; 4443 } 4444 } 4445 if (!super_duplicate) { 4446 iftable->SetInterface(idx++, super_interface); 4447 } 4448 } 4449 } 4450 } 4451 // Shrink iftable in case duplicates were found 4452 if (idx < ifcount) { 4453 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4454 if (UNLIKELY(iftable.Get() == NULL)) { 4455 CHECK(self->IsExceptionPending()); // OOME. 4456 return false; 4457 } 4458 ifcount = idx; 4459 } else { 4460 CHECK_EQ(idx, ifcount); 4461 } 4462 klass->SetIfTable(iftable.Get()); 4463 4464 // If we're an interface, we don't need the vtable pointers, so we're done. 4465 if (klass->IsInterface()) { 4466 return true; 4467 } 4468 // Allocate imtable 4469 bool imtable_changed = false; 4470 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4471 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4472 if (UNLIKELY(imtable.Get() == NULL)) { 4473 CHECK(self->IsExceptionPending()); // OOME. 4474 return false; 4475 } 4476 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4477 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4478 size_t max_miranda_methods = 0; // The max size of miranda_list. 4479 for (size_t i = 0; i < ifcount; ++i) { 4480 max_miranda_methods += iftable->GetInterface(i)->NumVirtualMethods(); 4481 } 4482 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4483 miranda_list(hs.NewHandle(AllocArtMethodArray(self, max_miranda_methods))); 4484 size_t miranda_list_size = 0; // The current size of miranda_list. 4485 for (size_t i = 0; i < ifcount; ++i) { 4486 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4487 if (num_methods > 0) { 4488 StackHandleScope<2> hs(self); 4489 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4490 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4491 if (UNLIKELY(method_array.Get() == nullptr)) { 4492 CHECK(self->IsExceptionPending()); // OOME. 4493 return false; 4494 } 4495 iftable->SetMethodArray(i, method_array.Get()); 4496 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4497 hs.NewHandle(klass->GetVTableDuringLinking())); 4498 for (size_t j = 0; j < num_methods; ++j) { 4499 interface_mh.ChangeMethod(iftable->GetInterface(i)->GetVirtualMethod(j)); 4500 int32_t k; 4501 // For each method listed in the interface's method list, find the 4502 // matching method in our class's method list. We want to favor the 4503 // subclass over the superclass, which just requires walking 4504 // back from the end of the vtable. (This only matters if the 4505 // superclass defines a private method and this class redefines 4506 // it -- otherwise it would use the same vtable slot. In .dex files 4507 // those don't end up in the virtual method table, so it shouldn't 4508 // matter which direction we go. We walk it backward anyway.) 4509 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4510 vtable_mh.ChangeMethod(vtable->Get(k)); 4511 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4512 if (!vtable_mh.Get()->IsAbstract() && !vtable_mh.Get()->IsPublic()) { 4513 ThrowIllegalAccessError( 4514 klass.Get(), 4515 "Method '%s' implementing interface method '%s' is not public", 4516 PrettyMethod(vtable_mh.Get()).c_str(), 4517 PrettyMethod(interface_mh.Get()).c_str()); 4518 return false; 4519 } 4520 method_array->Set<false>(j, vtable_mh.Get()); 4521 // Place method in imt if entry is empty, place conflict otherwise. 4522 uint32_t imt_index = interface_mh.Get()->GetDexMethodIndex() % mirror::Class::kImtSize; 4523 if (imtable->Get(imt_index) == NULL) { 4524 imtable->Set<false>(imt_index, vtable_mh.Get()); 4525 imtable_changed = true; 4526 } else { 4527 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4528 } 4529 break; 4530 } 4531 } 4532 if (k < 0) { 4533 StackHandleScope<1> hs(self); 4534 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4535 for (size_t l = 0; l < miranda_list_size; ++l) { 4536 mirror::ArtMethod* mir_method = miranda_list->Get(l); 4537 DCHECK(mir_method != nullptr); 4538 vtable_mh.ChangeMethod(mir_method); 4539 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4540 miranda_method.Assign(mir_method); 4541 break; 4542 } 4543 } 4544 if (miranda_method.Get() == NULL) { 4545 // Point the interface table at a phantom slot. 4546 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_mh.Get()->Clone(self))); 4547 if (UNLIKELY(miranda_method.Get() == NULL)) { 4548 CHECK(self->IsExceptionPending()); // OOME. 4549 return false; 4550 } 4551 DCHECK_LT(miranda_list_size, max_miranda_methods); 4552 miranda_list->Set<false>(miranda_list_size++, miranda_method.Get()); 4553 } 4554 method_array->Set<false>(j, miranda_method.Get()); 4555 } 4556 } 4557 } 4558 } 4559 if (imtable_changed) { 4560 // Fill in empty entries in interface method table with conflict. 4561 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4562 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4563 if (imtable->Get(i) == NULL) { 4564 imtable->Set<false>(i, imt_conflict_method); 4565 } 4566 } 4567 klass->SetImTable(imtable.Get()); 4568 } 4569 if (miranda_list_size > 0) { 4570 int old_method_count = klass->NumVirtualMethods(); 4571 int new_method_count = old_method_count + miranda_list_size; 4572 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4573 if (old_method_count == 0) { 4574 virtuals = AllocArtMethodArray(self, new_method_count); 4575 } else { 4576 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4577 } 4578 if (UNLIKELY(virtuals == NULL)) { 4579 CHECK(self->IsExceptionPending()); // OOME. 4580 return false; 4581 } 4582 klass->SetVirtualMethods(virtuals); 4583 4584 StackHandleScope<1> hs(self); 4585 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4586 hs.NewHandle(klass->GetVTableDuringLinking())); 4587 CHECK(vtable.Get() != NULL); 4588 int old_vtable_count = vtable->GetLength(); 4589 int new_vtable_count = old_vtable_count + miranda_list_size; 4590 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4591 if (UNLIKELY(vtable.Get() == NULL)) { 4592 CHECK(self->IsExceptionPending()); // OOME. 4593 return false; 4594 } 4595 for (size_t i = 0; i < miranda_list_size; ++i) { 4596 mirror::ArtMethod* method = miranda_list->Get(i); 4597 // Leave the declaring class alone as type indices are relative to it 4598 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4599 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4600 klass->SetVirtualMethod(old_method_count + i, method); 4601 vtable->Set<false>(old_vtable_count + i, method); 4602 } 4603 // TODO: do not assign to the vtable field until it is fully constructed. 4604 klass->SetVTable(vtable.Get()); 4605 } 4606 4607 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4608 for (int i = 0; i < vtable->GetLength(); ++i) { 4609 CHECK(vtable->Get(i) != NULL); 4610 } 4611 4612// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4613 4614 return true; 4615} 4616 4617bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4618 CHECK(klass.Get() != NULL); 4619 return LinkFields(klass, false, nullptr); 4620} 4621 4622bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass, size_t* class_size) { 4623 CHECK(klass.Get() != NULL); 4624 return LinkFields(klass, true, class_size); 4625} 4626 4627struct LinkFieldsComparator { 4628 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4629 } 4630 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4631 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4632 NO_THREAD_SAFETY_ANALYSIS { 4633 // First come reference fields, then 64-bit, and finally 32-bit 4634 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4635 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4636 if (type1 != type2) { 4637 bool is_primitive1 = type1 != Primitive::kPrimNot; 4638 bool is_primitive2 = type2 != Primitive::kPrimNot; 4639 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4640 type1 == Primitive::kPrimDouble); 4641 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4642 type2 == Primitive::kPrimDouble); 4643 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4644 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4645 if (order1 != order2) { 4646 return order1 < order2; 4647 } 4648 } 4649 // same basic group? then sort by string. 4650 return strcmp(field1->GetName(), field2->GetName()) < 0; 4651 } 4652}; 4653 4654bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static, size_t* class_size) { 4655 size_t num_fields = 4656 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4657 4658 mirror::ObjectArray<mirror::ArtField>* fields = 4659 is_static ? klass->GetSFields() : klass->GetIFields(); 4660 4661 // Initialize field_offset 4662 MemberOffset field_offset(0); 4663 if (is_static) { 4664 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 4665 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4666 // Static fields come after the embedded tables. 4667 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 4668 0, 0, 0); 4669 } 4670 field_offset = MemberOffset(base); 4671 } else { 4672 mirror::Class* super_class = klass->GetSuperClass(); 4673 if (super_class != NULL) { 4674 CHECK(super_class->IsResolved()) 4675 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4676 field_offset = MemberOffset(super_class->GetObjectSize()); 4677 } 4678 } 4679 4680 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4681 4682 // we want a relatively stable order so that adding new fields 4683 // minimizes disruption of C++ version such as Class and Method. 4684 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4685 for (size_t i = 0; i < num_fields; i++) { 4686 mirror::ArtField* f = fields->Get(i); 4687 CHECK(f != NULL) << PrettyClass(klass.Get()); 4688 grouped_and_sorted_fields.push_back(f); 4689 } 4690 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4691 LinkFieldsComparator()); 4692 4693 // References should be at the front. 4694 size_t current_field = 0; 4695 size_t num_reference_fields = 0; 4696 for (; current_field < num_fields; current_field++) { 4697 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4698 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4699 bool isPrimitive = type != Primitive::kPrimNot; 4700 if (isPrimitive) { 4701 break; // past last reference, move on to the next phase 4702 } 4703 grouped_and_sorted_fields.pop_front(); 4704 num_reference_fields++; 4705 fields->Set<false>(current_field, field); 4706 field->SetOffset(field_offset); 4707 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4708 } 4709 4710 // Now we want to pack all of the double-wide fields together. If 4711 // we're not aligned, though, we want to shuffle one 32-bit field 4712 // into place. If we can't find one, we'll have to pad it. 4713 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4714 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4715 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4716 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4717 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4718 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4719 continue; 4720 } 4721 fields->Set<false>(current_field++, field); 4722 field->SetOffset(field_offset); 4723 // drop the consumed field 4724 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4725 break; 4726 } 4727 // whether we found a 32-bit field for padding or not, we advance 4728 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4729 } 4730 4731 // Alignment is good, shuffle any double-wide fields forward, and 4732 // finish assigning field offsets to all fields. 4733 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 4734 << PrettyClass(klass.Get()); 4735 while (!grouped_and_sorted_fields.empty()) { 4736 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4737 grouped_and_sorted_fields.pop_front(); 4738 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4739 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4740 fields->Set<false>(current_field, field); 4741 field->SetOffset(field_offset); 4742 field_offset = MemberOffset(field_offset.Uint32Value() + 4743 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4744 ? sizeof(uint64_t) 4745 : sizeof(uint32_t))); 4746 current_field++; 4747 } 4748 4749 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4750 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4751 // We know there are no non-reference fields in the Reference classes, and we know 4752 // that 'referent' is alphabetically last, so this is easy... 4753 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4754 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4755 --num_reference_fields; 4756 } 4757 4758 if (kIsDebugBuild) { 4759 // Make sure that all reference fields appear before 4760 // non-reference fields, and all double-wide fields are aligned. 4761 bool seen_non_ref = false; 4762 for (size_t i = 0; i < num_fields; i++) { 4763 mirror::ArtField* field = fields->Get(i); 4764 if (false) { // enable to debug field layout 4765 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4766 << " class=" << PrettyClass(klass.Get()) 4767 << " field=" << PrettyField(field) 4768 << " offset=" 4769 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4770 } 4771 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4772 bool is_primitive = type != Primitive::kPrimNot; 4773 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4774 strcmp("referent", field->GetName()) == 0) { 4775 is_primitive = true; // We lied above, so we have to expect a lie here. 4776 } 4777 if (is_primitive) { 4778 if (!seen_non_ref) { 4779 seen_non_ref = true; 4780 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4781 } 4782 } else { 4783 DCHECK(!seen_non_ref) << PrettyField(field); 4784 } 4785 } 4786 if (!seen_non_ref) { 4787 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4788 } 4789 } 4790 4791 size_t size = field_offset.Uint32Value(); 4792 // Update klass 4793 if (is_static) { 4794 klass->SetNumReferenceStaticFields(num_reference_fields); 4795 *class_size = size; 4796 } else { 4797 klass->SetNumReferenceInstanceFields(num_reference_fields); 4798 if (!klass->IsVariableSize()) { 4799 std::string temp; 4800 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 4801 size_t previous_size = klass->GetObjectSize(); 4802 if (previous_size != 0) { 4803 // Make sure that we didn't originally have an incorrect size. 4804 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 4805 } 4806 klass->SetObjectSize(size); 4807 } 4808 } 4809 return true; 4810} 4811 4812// Set the bitmap of reference offsets, refOffsets, from the ifields 4813// list. 4814void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4815 uint32_t reference_offsets = 0; 4816 mirror::Class* super_class = klass->GetSuperClass(); 4817 if (super_class != NULL) { 4818 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4819 // If our superclass overflowed, we don't stand a chance. 4820 if (reference_offsets == CLASS_WALK_SUPER) { 4821 klass->SetReferenceInstanceOffsets(reference_offsets); 4822 return; 4823 } 4824 } 4825 CreateReferenceOffsets(klass, false, reference_offsets); 4826} 4827 4828void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4829 CreateReferenceOffsets(klass, true, 0); 4830} 4831 4832void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4833 uint32_t reference_offsets) { 4834 size_t num_reference_fields = 4835 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4836 : klass->NumReferenceInstanceFieldsDuringLinking(); 4837 mirror::ObjectArray<mirror::ArtField>* fields = 4838 is_static ? klass->GetSFields() : klass->GetIFields(); 4839 // All of the fields that contain object references are guaranteed 4840 // to be at the beginning of the fields list. 4841 for (size_t i = 0; i < num_reference_fields; ++i) { 4842 // Note that byte_offset is the offset from the beginning of 4843 // object, not the offset into instance data 4844 mirror::ArtField* field = fields->Get(i); 4845 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4846 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4847 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4848 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4849 CHECK_NE(new_bit, 0U); 4850 reference_offsets |= new_bit; 4851 } else { 4852 reference_offsets = CLASS_WALK_SUPER; 4853 break; 4854 } 4855 } 4856 // Update fields in klass 4857 if (is_static) { 4858 klass->SetReferenceStaticOffsets(reference_offsets); 4859 } else { 4860 klass->SetReferenceInstanceOffsets(reference_offsets); 4861 } 4862} 4863 4864mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4865 Handle<mirror::DexCache> dex_cache) { 4866 DCHECK(dex_cache.Get() != nullptr); 4867 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4868 if (resolved != NULL) { 4869 return resolved; 4870 } 4871 uint32_t utf16_length; 4872 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4873 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4874 dex_cache->SetResolvedString(string_idx, string); 4875 return string; 4876} 4877 4878mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4879 mirror::Class* referrer) { 4880 StackHandleScope<2> hs(Thread::Current()); 4881 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4882 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4883 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4884} 4885 4886mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4887 Handle<mirror::DexCache> dex_cache, 4888 Handle<mirror::ClassLoader> class_loader) { 4889 DCHECK(dex_cache.Get() != NULL); 4890 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4891 if (resolved == NULL) { 4892 Thread* self = Thread::Current(); 4893 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4894 resolved = FindClass(self, descriptor, class_loader); 4895 if (resolved != NULL) { 4896 // TODO: we used to throw here if resolved's class loader was not the 4897 // boot class loader. This was to permit different classes with the 4898 // same name to be loaded simultaneously by different loaders 4899 dex_cache->SetResolvedType(type_idx, resolved); 4900 } else { 4901 CHECK(self->IsExceptionPending()) 4902 << "Expected pending exception for failed resolution of: " << descriptor; 4903 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4904 StackHandleScope<1> hs(self); 4905 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4906 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4907 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4908 self->ClearException(); 4909 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4910 self->GetException(NULL)->SetCause(cause.Get()); 4911 } 4912 } 4913 } 4914 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4915 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4916 return resolved; 4917} 4918 4919mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 4920 Handle<mirror::DexCache> dex_cache, 4921 Handle<mirror::ClassLoader> class_loader, 4922 Handle<mirror::ArtMethod> referrer, 4923 InvokeType type) { 4924 DCHECK(dex_cache.Get() != nullptr); 4925 // Check for hit in the dex cache. 4926 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4927 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 4928 return resolved; 4929 } 4930 // Fail, get the declaring class. 4931 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4932 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4933 if (klass == nullptr) { 4934 DCHECK(Thread::Current()->IsExceptionPending()); 4935 return nullptr; 4936 } 4937 // Scan using method_idx, this saves string compares but will only hit for matching dex 4938 // caches/files. 4939 switch (type) { 4940 case kDirect: // Fall-through. 4941 case kStatic: 4942 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 4943 break; 4944 case kInterface: 4945 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 4946 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 4947 break; 4948 case kSuper: // Fall-through. 4949 case kVirtual: 4950 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 4951 break; 4952 default: 4953 LOG(FATAL) << "Unreachable - invocation type: " << type; 4954 } 4955 if (resolved == nullptr) { 4956 // Search by name, which works across dex files. 4957 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4958 const Signature signature = dex_file.GetMethodSignature(method_id); 4959 switch (type) { 4960 case kDirect: // Fall-through. 4961 case kStatic: 4962 resolved = klass->FindDirectMethod(name, signature); 4963 break; 4964 case kInterface: 4965 resolved = klass->FindInterfaceMethod(name, signature); 4966 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 4967 break; 4968 case kSuper: // Fall-through. 4969 case kVirtual: 4970 resolved = klass->FindVirtualMethod(name, signature); 4971 break; 4972 } 4973 } 4974 // If we found a method, check for incompatible class changes. 4975 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 4976 // Be a good citizen and update the dex cache to speed subsequent calls. 4977 dex_cache->SetResolvedMethod(method_idx, resolved); 4978 return resolved; 4979 } else { 4980 // If we had a method, it's an incompatible-class-change error. 4981 if (resolved != nullptr) { 4982 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 4983 } else { 4984 // We failed to find the method which means either an access error, an incompatible class 4985 // change, or no such method. First try to find the method among direct and virtual methods. 4986 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4987 const Signature signature = dex_file.GetMethodSignature(method_id); 4988 switch (type) { 4989 case kDirect: 4990 case kStatic: 4991 resolved = klass->FindVirtualMethod(name, signature); 4992 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 4993 // have had a resolved method before, which triggers the "true" branch above. 4994 break; 4995 case kInterface: 4996 case kVirtual: 4997 case kSuper: 4998 resolved = klass->FindDirectMethod(name, signature); 4999 break; 5000 } 5001 5002 // If we found something, check that it can be accessed by the referrer. 5003 if (resolved != nullptr && referrer.Get() != nullptr) { 5004 mirror::Class* methods_class = resolved->GetDeclaringClass(); 5005 mirror::Class* referring_class = referrer->GetDeclaringClass(); 5006 if (!referring_class->CanAccess(methods_class)) { 5007 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 5008 resolved, type); 5009 return nullptr; 5010 } else if (!referring_class->CanAccessMember(methods_class, 5011 resolved->GetAccessFlags())) { 5012 ThrowIllegalAccessErrorMethod(referring_class, resolved); 5013 return nullptr; 5014 } 5015 } 5016 5017 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 5018 // methods and throw if we find the method there. If we find nothing, throw a 5019 // NoSuchMethodError. 5020 switch (type) { 5021 case kDirect: 5022 case kStatic: 5023 if (resolved != nullptr) { 5024 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5025 } else { 5026 resolved = klass->FindInterfaceMethod(name, signature); 5027 if (resolved != nullptr) { 5028 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5029 } else { 5030 ThrowNoSuchMethodError(type, klass, name, signature); 5031 } 5032 } 5033 break; 5034 case kInterface: 5035 if (resolved != nullptr) { 5036 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5037 } else { 5038 resolved = klass->FindVirtualMethod(name, signature); 5039 if (resolved != nullptr) { 5040 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 5041 } else { 5042 ThrowNoSuchMethodError(type, klass, name, signature); 5043 } 5044 } 5045 break; 5046 case kSuper: 5047 ThrowNoSuchMethodError(type, klass, name, signature); 5048 break; 5049 case kVirtual: 5050 if (resolved != nullptr) { 5051 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 5052 } else { 5053 resolved = klass->FindInterfaceMethod(name, signature); 5054 if (resolved != nullptr) { 5055 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 5056 } else { 5057 ThrowNoSuchMethodError(type, klass, name, signature); 5058 } 5059 } 5060 break; 5061 } 5062 } 5063 DCHECK(Thread::Current()->IsExceptionPending()); 5064 return nullptr; 5065 } 5066} 5067 5068mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5069 Handle<mirror::DexCache> dex_cache, 5070 Handle<mirror::ClassLoader> class_loader, 5071 bool is_static) { 5072 DCHECK(dex_cache.Get() != nullptr); 5073 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5074 if (resolved != nullptr) { 5075 return resolved; 5076 } 5077 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5078 Thread* const self = Thread::Current(); 5079 StackHandleScope<1> hs(self); 5080 Handle<mirror::Class> klass( 5081 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5082 if (klass.Get() == nullptr) { 5083 DCHECK(Thread::Current()->IsExceptionPending()); 5084 return nullptr; 5085 } 5086 5087 if (is_static) { 5088 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5089 } else { 5090 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5091 } 5092 5093 if (resolved == nullptr) { 5094 const char* name = dex_file.GetFieldName(field_id); 5095 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5096 if (is_static) { 5097 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5098 } else { 5099 resolved = klass->FindInstanceField(name, type); 5100 } 5101 if (resolved == nullptr) { 5102 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5103 return NULL; 5104 } 5105 } 5106 dex_cache->SetResolvedField(field_idx, resolved); 5107 return resolved; 5108} 5109 5110mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5111 uint32_t field_idx, 5112 Handle<mirror::DexCache> dex_cache, 5113 Handle<mirror::ClassLoader> class_loader) { 5114 DCHECK(dex_cache.Get() != nullptr); 5115 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5116 if (resolved != nullptr) { 5117 return resolved; 5118 } 5119 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5120 Thread* self = Thread::Current(); 5121 StackHandleScope<1> hs(self); 5122 Handle<mirror::Class> klass( 5123 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5124 if (klass.Get() == NULL) { 5125 DCHECK(Thread::Current()->IsExceptionPending()); 5126 return NULL; 5127 } 5128 5129 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5130 StringPiece type(dex_file.StringDataByIdx( 5131 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5132 resolved = mirror::Class::FindField(self, klass, name, type); 5133 if (resolved != NULL) { 5134 dex_cache->SetResolvedField(field_idx, resolved); 5135 } else { 5136 ThrowNoSuchFieldError("", klass.Get(), type, name); 5137 } 5138 return resolved; 5139} 5140 5141const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5142 uint32_t* length) { 5143 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5144 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5145 const DexFile& dex_file = *dex_cache->GetDexFile(); 5146 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5147 return dex_file.GetMethodShorty(method_id, length); 5148} 5149 5150void ClassLinker::DumpAllClasses(int flags) { 5151 if (dex_cache_image_class_lookup_required_) { 5152 MoveImageClassesToClassTable(); 5153 } 5154 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5155 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5156 std::vector<mirror::Class*> all_classes; 5157 { 5158 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5159 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5160 mirror::Class* klass = it.second.Read(); 5161 all_classes.push_back(klass); 5162 } 5163 } 5164 5165 for (size_t i = 0; i < all_classes.size(); ++i) { 5166 all_classes[i]->DumpClass(std::cerr, flags); 5167 } 5168} 5169 5170void ClassLinker::DumpForSigQuit(std::ostream& os) { 5171 if (dex_cache_image_class_lookup_required_) { 5172 MoveImageClassesToClassTable(); 5173 } 5174 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5175 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5176} 5177 5178size_t ClassLinker::NumLoadedClasses() { 5179 if (dex_cache_image_class_lookup_required_) { 5180 MoveImageClassesToClassTable(); 5181 } 5182 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5183 return class_table_.size(); 5184} 5185 5186pid_t ClassLinker::GetClassesLockOwner() { 5187 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5188} 5189 5190pid_t ClassLinker::GetDexLockOwner() { 5191 return dex_lock_.GetExclusiveOwnerTid(); 5192} 5193 5194void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5195 DCHECK(!init_done_); 5196 5197 DCHECK(klass != NULL); 5198 DCHECK(klass->GetClassLoader() == NULL); 5199 5200 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5201 DCHECK(class_roots != NULL); 5202 DCHECK(class_roots->Get(class_root) == NULL); 5203 class_roots->Set<false>(class_root, klass); 5204} 5205 5206} // namespace art 5207