class_linker.cc revision 1e5bc0bc5257cb1fce5fe71a1b922527fe6b8fa4
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <fcntl.h> 20#include <sys/file.h> 21#include <sys/stat.h> 22#include <deque> 23#include <memory> 24#include <string> 25#include <utility> 26#include <vector> 27 28#include "base/casts.h" 29#include "base/logging.h" 30#include "base/scoped_flock.h" 31#include "base/stl_util.h" 32#include "base/unix_file/fd_file.h" 33#include "class_linker-inl.h" 34#include "compiler_callbacks.h" 35#include "debugger.h" 36#include "dex_file-inl.h" 37#include "gc/accounting/card_table-inl.h" 38#include "gc/accounting/heap_bitmap.h" 39#include "gc/heap.h" 40#include "gc/space/image_space.h" 41#include "handle_scope.h" 42#include "intern_table.h" 43#include "interpreter/interpreter.h" 44#include "leb128.h" 45#include "oat.h" 46#include "oat_file.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 "object_utils.h" 61#include "os.h" 62#include "runtime.h" 63#include "entrypoints/entrypoint_utils.h" 64#include "ScopedLocalRef.h" 65#include "scoped_thread_state_change.h" 66#include "handle_scope-inl.h" 67#include "thread.h" 68#include "utils.h" 69#include "verifier/method_verifier.h" 70#include "well_known_classes.h" 71 72namespace art { 73 74static void ThrowNoClassDefFoundError(const char* fmt, ...) 75 __attribute__((__format__(__printf__, 1, 2))) 76 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 77static void ThrowNoClassDefFoundError(const char* fmt, ...) { 78 va_list args; 79 va_start(args, fmt); 80 Thread* self = Thread::Current(); 81 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 82 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 83 va_end(args); 84} 85 86static void ThrowEarlierClassFailure(mirror::Class* c) 87 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 88 // The class failed to initialize on a previous attempt, so we want to throw 89 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 90 // failed in verification, in which case v2 5.4.1 says we need to re-throw 91 // the previous error. 92 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 93 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 94 } 95 96 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 97 Thread* self = Thread::Current(); 98 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 99 if (c->GetVerifyErrorClass() != NULL) { 100 // TODO: change the verifier to store an _instance_, with a useful detail message? 101 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor().c_str(), 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_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 270 kClassRootsMax); 271 CHECK(class_roots_ != NULL); 272 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 273 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 274 SetClassRoot(kClassArrayClass, class_array_class.Get()); 275 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 276 SetClassRoot(kCharArrayClass, char_array_class.Get()); 277 SetClassRoot(kJavaLangString, java_lang_String.Get()); 278 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 279 280 // Setup the primitive type classes. 281 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 282 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 283 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 284 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 285 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 286 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 287 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 288 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 289 290 // Create array interface entries to populate once we can load system classes. 291 array_iftable_ = AllocIfTable(self, 2); 292 293 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 294 Handle<mirror::Class> int_array_class(hs.NewHandle( 295 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 296 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 297 mirror::IntArray::SetArrayClass(int_array_class.Get()); 298 SetClassRoot(kIntArrayClass, int_array_class.Get()); 299 300 // now that these are registered, we can use AllocClass() and AllocObjectArray 301 302 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 303 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 304 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 305 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 306 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 307 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 308 309 // Constructor, Field, Method, and AbstractMethod are necessary so 310 // that FindClass can link members. 311 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 312 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 313 CHECK(java_lang_reflect_ArtField.Get() != NULL); 314 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 315 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 316 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 317 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 318 319 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 320 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 321 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 322 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 323 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 324 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 325 326 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 327 328 // Set up array classes for string, field, method 329 Handle<mirror::Class> object_array_string(hs.NewHandle( 330 AllocClass(self, java_lang_Class.Get(), 331 mirror::ObjectArray<mirror::String>::ClassSize()))); 332 object_array_string->SetComponentType(java_lang_String.Get()); 333 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 334 335 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 336 AllocClass(self, java_lang_Class.Get(), 337 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 338 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 339 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 340 341 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 342 AllocClass(self, java_lang_Class.Get(), 343 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 344 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 345 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 346 347 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 348 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 349 // these roots. 350 CHECK_NE(0U, boot_class_path.size()); 351 for (size_t i = 0; i != boot_class_path.size(); ++i) { 352 const DexFile* dex_file = boot_class_path[i]; 353 CHECK(dex_file != NULL); 354 AppendToBootClassPath(*dex_file); 355 } 356 357 // now we can use FindSystemClass 358 359 // run char class through InitializePrimitiveClass to finish init 360 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 361 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 362 363 // Create runtime resolution and imt conflict methods. Also setup the default imt. 364 Runtime* runtime = Runtime::Current(); 365 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 366 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 367 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 368 369 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 370 // we do not need friend classes or a publicly exposed setter. 371 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 372 373 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 374 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 375 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 376 CHECK_EQ(java_lang_Object.Get(), Object_class); 377 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 378 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 379 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 380 std::ostringstream os1, os2; 381 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 382 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 383 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 384 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 385 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 386 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 387 CHECK_EQ(java_lang_String.Get(), String_class); 388 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 389 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 390 391 // Setup the primitive array type classes - can't be done until Object has a vtable. 392 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 393 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 394 395 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 396 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 397 398 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 399 CHECK_EQ(char_array_class.Get(), found_char_array_class); 400 401 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 402 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 403 404 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 405 CHECK_EQ(int_array_class.Get(), found_int_array_class); 406 407 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 408 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 409 410 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 411 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 412 413 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 414 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 415 416 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 417 CHECK_EQ(class_array_class.Get(), found_class_array_class); 418 419 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 420 CHECK_EQ(object_array_class.Get(), found_object_array_class); 421 422 // Setup the single, global copy of "iftable". 423 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 424 CHECK(java_lang_Cloneable != NULL); 425 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 426 CHECK(java_io_Serializable != NULL); 427 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 428 // crawl up and explicitly list all of the supers as well. 429 { 430 mirror::IfTable* array_iftable = 431 ReadBarrier::BarrierForRoot<mirror::IfTable, kWithReadBarrier>(&array_iftable_); 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_ != NULL); 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 (!kIsTargetBuild) { 617 argv.push_back("--host"); 618 } 619 620 argv.push_back(boot_image_option); 621 argv.push_back(dex_file_option); 622 argv.push_back(oat_fd_option); 623 argv.push_back(oat_location_option); 624 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 625 for (size_t i = 0; i < compiler_options.size(); ++i) { 626 argv.push_back(compiler_options[i].c_str()); 627 } 628 629 return Exec(argv, error_msg); 630} 631 632const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 633 WriterMutexLock mu(Thread::Current(), dex_lock_); 634 if (kIsDebugBuild) { 635 for (size_t i = 0; i < oat_files_.size(); ++i) { 636 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 637 } 638 } 639 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 640 oat_files_.push_back(oat_file); 641 return oat_file; 642} 643 644OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 645 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 646 OatFile* oat_file = space->ReleaseOatFile(); 647 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 648 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 649 return *oat_file; 650} 651 652const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 653 const char* dex_location = dex_file.GetLocation().c_str(); 654 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 655 return FindOpenedOatFile(nullptr, dex_location, &dex_location_checksum); 656} 657 658const OatFile* ClassLinker::FindOpenedOatFile(const char* oat_location, const char* dex_location, 659 const uint32_t* const dex_location_checksum) { 660 ReaderMutexLock mu(Thread::Current(), dex_lock_); 661 for (size_t i = 0; i < oat_files_.size(); i++) { 662 const OatFile* oat_file = oat_files_[i]; 663 DCHECK(oat_file != NULL); 664 665 if (oat_location != nullptr) { 666 if (oat_file->GetLocation() != oat_location) { 667 continue; 668 } 669 } 670 671 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 672 dex_location_checksum, 673 false); 674 if (oat_dex_file != NULL) { 675 return oat_file; 676 } 677 } 678 return NULL; 679} 680 681static std::string GetMultiDexClassesDexName(size_t number, const char* dex_location) { 682 if (number == 0) { 683 return dex_location; 684 } else { 685 return StringPrintf("%s" kMultiDexSeparatorString "classes%zu.dex", dex_location, number + 1); 686 } 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 = 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 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 817 oat_location, &error_msg)); 818 819 if (open_oat_file.get() == nullptr) { 820 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 821 dex_location, oat_location, error_msg.c_str()); 822 VLOG(class_linker) << compound_msg; 823 error_msgs->push_back(compound_msg); 824 } 825 } else { 826 // TODO: What to lock here? 827 bool obsolete_file_cleanup_failed; 828 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 829 dex_location_checksum_pointer, 830 kRuntimeISA, error_msgs, 831 &obsolete_file_cleanup_failed)); 832 // There's no point in going forward and eventually try to regenerate the 833 // file if we couldn't remove the obsolete one. Mostly likely we will fail 834 // with the same error when trying to write the new file. 835 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 836 if (obsolete_file_cleanup_failed) { 837 return false; 838 } 839 } 840 needs_registering = true; 841 } 842 843 // 3) If we have an oat file, check all contained multidex files for our dex_location. 844 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 845 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, false, error_msgs, 846 dex_files); 847 if (success) { 848 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 849 if (needs_registering) { 850 // We opened the oat file, so we must register it. 851 RegisterOatFile(oat_file); 852 } 853 return true; 854 } else { 855 if (needs_registering) { 856 // We opened it, delete it. 857 open_oat_file.reset(); 858 } else { 859 open_oat_file.release(); // Do not delete open oat files. 860 } 861 } 862 863 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 864 865 // Need a checksum, fail else. 866 if (!have_checksum) { 867 error_msgs->push_back(checksum_error_msg); 868 return false; 869 } 870 871 // Look in cache location if no oat_location is given. 872 std::string cache_location; 873 if (oat_location == nullptr) { 874 // Use the dalvik cache. 875 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 876 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 877 oat_location = cache_location.c_str(); 878 } 879 880 // Definitely need to lock now. 881 if (!scoped_flock.HasFile()) { 882 std::string error_msg; 883 if (!scoped_flock.Init(oat_location, &error_msg)) { 884 error_msgs->push_back(error_msg); 885 return false; 886 } 887 } 888 889 // Create the oat file. 890 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 891 oat_location, error_msgs)); 892 893 // Failed, bail. 894 if (open_oat_file.get() == nullptr) { 895 return false; 896 } 897 898 // Try to load again, but stronger checks. 899 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, true, error_msgs, 900 dex_files); 901 if (success) { 902 RegisterOatFile(open_oat_file.release()); 903 return true; 904 } else { 905 return false; 906 } 907} 908 909const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 910 uint32_t dex_location_checksum, 911 const char* oat_location, 912 std::string* error_msg) { 913 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 914 !Runtime::Current()->IsCompiler(), 915 error_msg)); 916 if (oat_file.get() == nullptr) { 917 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 918 error_msg->c_str()); 919 return nullptr; 920 } 921 Runtime* runtime = Runtime::Current(); 922 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 923 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 924 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 925 if (expected_image_oat_checksum != actual_image_oat_checksum) { 926 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 927 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 928 actual_image_oat_checksum); 929 return nullptr; 930 } 931 932 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 933 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 934 if (expected_image_oat_offset != actual_image_oat_offset) { 935 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 936 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 937 actual_image_oat_offset); 938 return nullptr; 939 } 940 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 941 &dex_location_checksum); 942 if (oat_dex_file == nullptr) { 943 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 944 dex_location); 945 return nullptr; 946 } 947 uint32_t expected_dex_checksum = dex_location_checksum; 948 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 949 if (expected_dex_checksum != actual_dex_checksum) { 950 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 951 "found 0x%x", oat_location, expected_dex_checksum, 952 actual_dex_checksum); 953 return nullptr; 954 } 955 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 956 if (dex_file.get() != nullptr) { 957 return oat_file.release(); 958 } else { 959 return nullptr; 960 } 961} 962 963const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 964 int fd, const char* oat_location, 965 std::vector<std::string>* error_msgs) { 966 // Generate the output oat file for the dex file 967 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 968 std::string error_msg; 969 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 970 CHECK(!error_msg.empty()); 971 error_msgs->push_back(error_msg); 972 return nullptr; 973 } 974 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 975 !Runtime::Current()->IsCompiler(), 976 &error_msg)); 977 if (oat_file.get() == nullptr) { 978 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 979 oat_location, error_msg.c_str()); 980 error_msgs->push_back(compound_msg); 981 return nullptr; 982 } 983 984 return oat_file.release(); 985} 986 987bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 988 const char* dex_location, 989 uint32_t dex_location_checksum, 990 const InstructionSet instruction_set, 991 std::string* error_msg) { 992 Runtime* runtime = Runtime::Current(); 993 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 994 995 // If the requested instruction set is the same as the current runtime, 996 // we can use the checksums directly. If it isn't, we'll have to read the 997 // image header from the image for the right instruction set. 998 uint32_t image_oat_checksum = 0; 999 uintptr_t image_oat_data_begin = 0; 1000 if (instruction_set == kRuntimeISA) { 1001 const ImageHeader& image_header = image_space->GetImageHeader(); 1002 image_oat_checksum = image_header.GetOatChecksum(); 1003 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1004 } else { 1005 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1006 image_space->GetImageLocation().c_str(), instruction_set)); 1007 image_oat_checksum = image_header->GetOatChecksum(); 1008 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1009 } 1010 const OatHeader& oat_header = oat_file->GetOatHeader(); 1011 bool image_check = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1012 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1013 1014 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1015 &dex_location_checksum); 1016 if (oat_dex_file == NULL) { 1017 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1018 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1019 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 1020 for (size_t i = 0; i < oat_dex_files.size(); i++) { 1021 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 1022 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 1023 oat_file->GetLocation().c_str(), 1024 oat_dex_file->GetDexFileLocation().c_str()); 1025 } 1026 return false; 1027 } 1028 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 1029 1030 if (image_check && dex_check) { 1031 return true; 1032 } 1033 1034 if (!image_check) { 1035 ScopedObjectAccess soa(Thread::Current()); 1036 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with (0x%x, %" PRIdPTR ")", 1037 oat_file->GetLocation().c_str(), 1038 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1039 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1040 image_oat_checksum, image_oat_data_begin); 1041 } 1042 if (!dex_check) { 1043 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1044 oat_file->GetLocation().c_str(), 1045 oat_dex_file->GetDexFileLocationChecksum(), 1046 dex_location, dex_location_checksum); 1047 } 1048 return false; 1049} 1050 1051const OatFile* ClassLinker::LoadOatFileAndVerifyDexFile(const std::string& oat_file_location, 1052 const char* dex_location, 1053 std::string* error_msg, 1054 bool* open_failed) { 1055 std::unique_ptr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 1056 if (oat_file.get() == nullptr) { 1057 *open_failed = true; 1058 return nullptr; 1059 } 1060 *open_failed = false; 1061 std::unique_ptr<const DexFile> dex_file; 1062 uint32_t dex_location_checksum; 1063 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 1064 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1065 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1066 // directory. 1067 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1068 if (oat_dex_file == nullptr) { 1069 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1070 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 1071 error_msg->c_str()); 1072 return nullptr; 1073 } 1074 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1075 } else { 1076 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 1077 kRuntimeISA, error_msg); 1078 if (!verified) { 1079 return nullptr; 1080 } 1081 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1082 &dex_location_checksum)->OpenDexFile(error_msg)); 1083 } 1084 1085 if (dex_file.get() != nullptr) { 1086 return oat_file.release(); 1087 } else { 1088 return nullptr; 1089 } 1090} 1091 1092const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1093 const char* dex_location, 1094 const uint32_t* const dex_location_checksum, 1095 InstructionSet isa, 1096 std::vector<std::string>* error_msgs, 1097 bool* obsolete_file_cleanup_failed) { 1098 *obsolete_file_cleanup_failed = false; 1099 // Look for an existing file next to dex. for example, for 1100 // /foo/bar/baz.jar, look for /foo/bar/<isa>/baz.odex. 1101 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1102 bool open_failed; 1103 std::string error_msg; 1104 const OatFile* oat_file = LoadOatFileAndVerifyDexFile(odex_filename, dex_location, &error_msg, 1105 &open_failed); 1106 if (oat_file != nullptr) { 1107 return oat_file; 1108 } 1109 if (dex_location_checksum == nullptr) { 1110 error_msgs->push_back(StringPrintf("Failed to open oat file from %s and no classes.dex found in" 1111 "%s: %s", odex_filename.c_str(), dex_location, 1112 error_msg.c_str())); 1113 return nullptr; 1114 } 1115 1116 std::string cache_error_msg; 1117 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 1118 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location, 1119 dalvik_cache.c_str())); 1120 oat_file = LoadOatFileAndVerifyDexFile(cache_location, dex_location, &cache_error_msg, 1121 &open_failed); 1122 if (oat_file != nullptr) { 1123 return oat_file; 1124 } 1125 1126 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 1127 std::string error_msg = StringPrintf("Failed to remove obsolete file from %s when searching" 1128 "for dex file %s: %s", 1129 cache_location.c_str(), dex_location, strerror(errno)); 1130 error_msgs->push_back(error_msg); 1131 VLOG(class_linker) << error_msg; 1132 // Let the caller know that we couldn't remove the obsolete file. 1133 // This is a good indication that further writes may fail as well. 1134 *obsolete_file_cleanup_failed = true; 1135 } 1136 1137 std::string compound_msg = StringPrintf("Failed to open oat file from %s (error '%s') or %s " 1138 "(error '%s').", odex_filename.c_str(), error_msg.c_str(), 1139 cache_location.c_str(), cache_error_msg.c_str()); 1140 VLOG(class_linker) << compound_msg; 1141 error_msgs->push_back(compound_msg); 1142 1143 return nullptr; 1144} 1145 1146const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1147 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1148 for (size_t i = 0; i < oat_files_.size(); i++) { 1149 const OatFile* oat_file = oat_files_[i]; 1150 DCHECK(oat_file != nullptr); 1151 if (oat_file->GetLocation() == oat_location) { 1152 return oat_file; 1153 } 1154 } 1155 return nullptr; 1156} 1157 1158const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1159 std::string* error_msg) { 1160 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1161 if (oat_file != nullptr) { 1162 return oat_file; 1163 } 1164 1165 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1166 error_msg); 1167 if (oat_file == NULL) { 1168 return NULL; 1169 } 1170 return oat_file; 1171} 1172 1173static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1174 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1175 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1176 1177 DCHECK(obj != NULL); 1178 DCHECK(class_linker != NULL); 1179 1180 if (obj->IsArtMethod()) { 1181 mirror::ArtMethod* method = obj->AsArtMethod(); 1182 if (!method->IsNative()) { 1183 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1184 if (method != Runtime::Current()->GetResolutionMethod()) { 1185 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1186 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1187 } 1188 } 1189 } 1190} 1191 1192void ClassLinker::InitFromImage() { 1193 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1194 CHECK(!init_done_); 1195 1196 Thread* self = Thread::Current(); 1197 gc::Heap* heap = Runtime::Current()->GetHeap(); 1198 gc::space::ImageSpace* space = heap->GetImageSpace(); 1199 dex_cache_image_class_lookup_required_ = true; 1200 CHECK(space != NULL); 1201 OatFile& oat_file = GetImageOatFile(space); 1202 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1203 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1204 const char* image_file_location = oat_file.GetOatHeader(). 1205 GetStoreValueByKey(OatHeader::kImageLocationKey); 1206 CHECK(image_file_location == nullptr || *image_file_location == 0); 1207 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1208 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1209 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1210 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1211 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1212 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1213 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1214 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1215 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1216 1217 StackHandleScope<1> hs(self); 1218 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1219 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1220 AsObjectArray<mirror::Class>())); 1221 class_roots_ = class_roots.Get(); 1222 1223 // Special case of setting up the String class early so that we can test arbitrary objects 1224 // as being Strings or not 1225 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1226 1227 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1228 static_cast<uint32_t>(dex_caches->GetLength())); 1229 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1230 StackHandleScope<1> hs(self); 1231 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1232 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1233 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1234 nullptr); 1235 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1236 std::string error_msg; 1237 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1238 if (dex_file == NULL) { 1239 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1240 << " from within oat file " << oat_file.GetLocation() 1241 << " error '" << error_msg << "'"; 1242 } 1243 1244 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1245 1246 AppendToBootClassPath(*dex_file, dex_cache); 1247 } 1248 1249 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1250 // bitmap walk. 1251 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1252 1253 // Set entry point to interpreter if in InterpretOnly mode. 1254 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1255 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1256 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1257 } 1258 1259 // reinit class_roots_ 1260 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1261 class_roots_ = class_roots.Get(); 1262 1263 // reinit array_iftable_ from any array class instance, they should be == 1264 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1265 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1266 // String class root was set above 1267 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1268 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1269 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1270 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1271 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1272 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1273 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1274 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1275 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1276 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1277 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1278 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1279 1280 FinishInit(self); 1281 1282 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1283} 1284 1285void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1286 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1287 if ((flags & kVisitRootFlagAllRoots) != 0) { 1288 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1289 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1290 } 1291 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1292 for (auto& pair : new_class_roots_) { 1293 mirror::Object* old_ref = pair.second; 1294 callback(reinterpret_cast<mirror::Object**>(&pair.second), arg, 0, kRootStickyClass); 1295 if (UNLIKELY(pair.second != old_ref)) { 1296 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1297 // corresponding object. This is slow, but luckily for us, this may only happen with a 1298 // concurrent moving GC. 1299 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1300 it != end && it->first == pair.first; ++it) { 1301 // If the class stored matches the old class, update it to the new value. 1302 if (old_ref == it->second) { 1303 it->second = pair.second; 1304 } 1305 } 1306 } 1307 } 1308 } 1309 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1310 new_class_roots_.clear(); 1311 } 1312 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1313 log_new_class_table_roots_ = true; 1314 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1315 log_new_class_table_roots_ = false; 1316 } 1317 // We deliberately ignore the class roots in the image since we 1318 // handle image roots by using the MS/CMS rescanning of dirty cards. 1319} 1320 1321// Keep in sync with InitCallback. Anything we visit, we need to 1322// reinit references to when reinitializing a ClassLinker from a 1323// mapped image. 1324void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1325 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1326 Thread* self = Thread::Current(); 1327 { 1328 ReaderMutexLock mu(self, dex_lock_); 1329 if ((flags & kVisitRootFlagAllRoots) != 0) { 1330 for (mirror::DexCache*& dex_cache : dex_caches_) { 1331 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1332 } 1333 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1334 for (size_t index : new_dex_cache_roots_) { 1335 callback(reinterpret_cast<mirror::Object**>(&dex_caches_[index]), arg, 0, kRootVMInternal); 1336 } 1337 } 1338 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1339 new_dex_cache_roots_.clear(); 1340 } 1341 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1342 log_new_dex_caches_roots_ = true; 1343 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1344 log_new_dex_caches_roots_ = false; 1345 } 1346 } 1347 VisitClassRoots(callback, arg, flags); 1348 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1349 DCHECK(array_iftable_ != nullptr); 1350 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1351 if (find_array_class_cache_[i] != nullptr) { 1352 callback(reinterpret_cast<mirror::Object**>(&find_array_class_cache_[i]), arg, 0, 1353 kRootVMInternal); 1354 } 1355 } 1356} 1357 1358void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1359 if (dex_cache_image_class_lookup_required_) { 1360 MoveImageClassesToClassTable(); 1361 } 1362 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1363 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1364 mirror::Class** root = &it.second; 1365 mirror::Class* c = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 1366 if (!visitor(c, arg)) { 1367 return; 1368 } 1369 } 1370} 1371 1372static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1373 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1374 classes->insert(c); 1375 return true; 1376} 1377 1378void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1379 std::set<mirror::Class*> classes; 1380 VisitClasses(GetClassesVisitor, &classes); 1381 for (mirror::Class* klass : classes) { 1382 if (!visitor(klass, arg)) { 1383 return; 1384 } 1385 } 1386} 1387 1388ClassLinker::~ClassLinker() { 1389 mirror::Class::ResetClass(); 1390 mirror::String::ResetClass(); 1391 mirror::Reference::ResetClass(); 1392 mirror::ArtField::ResetClass(); 1393 mirror::ArtMethod::ResetClass(); 1394 mirror::BooleanArray::ResetArrayClass(); 1395 mirror::ByteArray::ResetArrayClass(); 1396 mirror::CharArray::ResetArrayClass(); 1397 mirror::DoubleArray::ResetArrayClass(); 1398 mirror::FloatArray::ResetArrayClass(); 1399 mirror::IntArray::ResetArrayClass(); 1400 mirror::LongArray::ResetArrayClass(); 1401 mirror::ShortArray::ResetArrayClass(); 1402 mirror::Throwable::ResetClass(); 1403 mirror::StackTraceElement::ResetClass(); 1404 STLDeleteElements(&boot_class_path_); 1405 STLDeleteElements(&oat_files_); 1406} 1407 1408mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1409 gc::Heap* heap = Runtime::Current()->GetHeap(); 1410 StackHandleScope<16> hs(self); 1411 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1412 Handle<mirror::DexCache> dex_cache( 1413 hs.NewHandle(down_cast<mirror::DexCache*>( 1414 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1415 VoidFunctor())))); 1416 if (dex_cache.Get() == NULL) { 1417 return NULL; 1418 } 1419 Handle<mirror::String> 1420 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1421 if (location.Get() == NULL) { 1422 return NULL; 1423 } 1424 Handle<mirror::ObjectArray<mirror::String>> 1425 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1426 if (strings.Get() == NULL) { 1427 return NULL; 1428 } 1429 Handle<mirror::ObjectArray<mirror::Class>> 1430 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1431 if (types.Get() == NULL) { 1432 return NULL; 1433 } 1434 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1435 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1436 if (methods.Get() == NULL) { 1437 return NULL; 1438 } 1439 Handle<mirror::ObjectArray<mirror::ArtField>> 1440 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1441 if (fields.Get() == NULL) { 1442 return NULL; 1443 } 1444 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1445 fields.Get()); 1446 return dex_cache.Get(); 1447} 1448 1449mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1450 uint32_t class_size) { 1451 DCHECK_GE(class_size, sizeof(mirror::Class)); 1452 gc::Heap* heap = Runtime::Current()->GetHeap(); 1453 mirror::Class::InitializeClassVisitor visitor(class_size); 1454 mirror::Object* k = kMovingClasses ? 1455 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1456 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1457 if (UNLIKELY(k == nullptr)) { 1458 CHECK(self->IsExceptionPending()); // OOME. 1459 return nullptr; 1460 } 1461 return k->AsClass(); 1462} 1463 1464mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1465 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1466} 1467 1468mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1469 return down_cast<mirror::ArtField*>( 1470 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1471} 1472 1473mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1474 return down_cast<mirror::ArtMethod*>( 1475 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1476} 1477 1478mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1479 Thread* self, size_t length) { 1480 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1481 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1482} 1483 1484mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1485 mirror::Class* klass) { 1486 DCHECK(klass != NULL); 1487 1488 // For temporary classes we must wait for them to be retired. 1489 if (init_done_ && klass->IsTemp()) { 1490 CHECK(!klass->IsResolved()); 1491 if (klass->IsErroneous()) { 1492 ThrowEarlierClassFailure(klass); 1493 return nullptr; 1494 } 1495 StackHandleScope<1> hs(self); 1496 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1497 ObjectLock<mirror::Class> lock(self, h_class); 1498 // Loop and wait for the resolving thread to retire this class. 1499 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1500 lock.WaitIgnoringInterrupts(); 1501 } 1502 if (h_class->IsErroneous()) { 1503 ThrowEarlierClassFailure(h_class.Get()); 1504 return nullptr; 1505 } 1506 CHECK(h_class->IsRetired()); 1507 // Get the updated class from class table. 1508 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1509 } 1510 1511 // Wait for the class if it has not already been linked. 1512 if (!klass->IsResolved() && !klass->IsErroneous()) { 1513 StackHandleScope<1> hs(self); 1514 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1515 ObjectLock<mirror::Class> lock(self, h_class); 1516 // Check for circular dependencies between classes. 1517 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1518 ThrowClassCircularityError(h_class.Get()); 1519 h_class->SetStatus(mirror::Class::kStatusError, self); 1520 return nullptr; 1521 } 1522 // Wait for the pending initialization to complete. 1523 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1524 lock.WaitIgnoringInterrupts(); 1525 } 1526 } 1527 1528 if (klass->IsErroneous()) { 1529 ThrowEarlierClassFailure(klass); 1530 return nullptr; 1531 } 1532 // Return the loaded class. No exceptions should be pending. 1533 CHECK(klass->IsResolved()) << PrettyClass(klass); 1534 self->AssertNoPendingException(); 1535 return klass; 1536} 1537 1538mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1539 Handle<mirror::ClassLoader> class_loader) { 1540 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1541 DCHECK(self != nullptr); 1542 self->AssertNoPendingException(); 1543 if (descriptor[1] == '\0') { 1544 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1545 // for primitive classes that aren't backed by dex files. 1546 return FindPrimitiveClass(descriptor[0]); 1547 } 1548 // Find the class in the loaded classes table. 1549 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1550 if (klass != NULL) { 1551 return EnsureResolved(self, descriptor, klass); 1552 } 1553 // Class is not yet loaded. 1554 if (descriptor[0] == '[') { 1555 return CreateArrayClass(self, descriptor, class_loader); 1556 } else if (class_loader.Get() == nullptr) { 1557 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1558 if (pair.second != NULL) { 1559 StackHandleScope<1> hs(self); 1560 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1561 } 1562 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1563 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1564 // throw of a NoClassDefFoundError. 1565 if (IsInBootClassPath(descriptor)) { 1566 mirror::Class* system_class = FindSystemClass(self, descriptor); 1567 CHECK(system_class != NULL); 1568 return system_class; 1569 } 1570 // Next try the compile time class path. 1571 const std::vector<const DexFile*>* class_path; 1572 { 1573 ScopedObjectAccessUnchecked soa(self); 1574 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1575 soa.AddLocalReference<jobject>(class_loader.Get())); 1576 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1577 } 1578 1579 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1580 if (pair.second != NULL) { 1581 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1582 } 1583 1584 } else { 1585 ScopedObjectAccessUnchecked soa(self); 1586 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1587 soa.AddLocalReference<jobject>(class_loader.Get())); 1588 std::string class_name_string(DescriptorToDot(descriptor)); 1589 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1590 { 1591 ScopedThreadStateChange tsc(self, kNative); 1592 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1593 soa.Env()->NewStringUTF(class_name_string.c_str())); 1594 if (class_name_object.get() == NULL) { 1595 return NULL; 1596 } 1597 CHECK(class_loader_object.get() != NULL); 1598 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1599 WellKnownClasses::java_lang_ClassLoader_loadClass, 1600 class_name_object.get())); 1601 } 1602 if (self->IsExceptionPending()) { 1603 // If the ClassLoader threw, pass that exception up. 1604 return NULL; 1605 } else if (result.get() == NULL) { 1606 // broken loader - throw NPE to be compatible with Dalvik 1607 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1608 class_name_string.c_str()).c_str()); 1609 return NULL; 1610 } else { 1611 // success, return mirror::Class* 1612 return soa.Decode<mirror::Class*>(result.get()); 1613 } 1614 } 1615 1616 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1617 return NULL; 1618} 1619 1620mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1621 Handle<mirror::ClassLoader> class_loader, 1622 const DexFile& dex_file, 1623 const DexFile::ClassDef& dex_class_def) { 1624 Thread* self = Thread::Current(); 1625 StackHandleScope<3> hs(self); 1626 auto klass = hs.NewHandle<mirror::Class>(nullptr); 1627 bool should_allocate = false; 1628 1629 // Load the class from the dex file. 1630 if (UNLIKELY(!init_done_)) { 1631 // finish up init of hand crafted class_roots_ 1632 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1633 klass.Assign(GetClassRoot(kJavaLangObject)); 1634 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1635 klass.Assign(GetClassRoot(kJavaLangClass)); 1636 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1637 klass.Assign(GetClassRoot(kJavaLangString)); 1638 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 1639 klass.Assign(GetClassRoot(kJavaLangRefReference)); 1640 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1641 klass.Assign(GetClassRoot(kJavaLangDexCache)); 1642 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1643 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 1644 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1645 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 1646 } else { 1647 should_allocate = true; 1648 } 1649 } else { 1650 should_allocate = true; 1651 } 1652 1653 if (should_allocate) { 1654 // Allocate a class with the status of not ready. 1655 // Interface object should get the right size here. Regular class will 1656 // figure out the right size later and be replaced with one of the right 1657 // size when the class becomes resolved. 1658 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 1659 } 1660 if (UNLIKELY(klass.Get() == NULL)) { 1661 CHECK(self->IsExceptionPending()); // Expect an OOME. 1662 return NULL; 1663 } 1664 klass->SetDexCache(FindDexCache(dex_file)); 1665 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 1666 // Check for a pending exception during load 1667 if (self->IsExceptionPending()) { 1668 klass->SetStatus(mirror::Class::kStatusError, self); 1669 return NULL; 1670 } 1671 ObjectLock<mirror::Class> lock(self, klass); 1672 klass->SetClinitThreadId(self->GetTid()); 1673 1674 // Add the newly loaded class to the loaded classes table. 1675 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 1676 if (existing != NULL) { 1677 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1678 // this thread to block. 1679 return EnsureResolved(self, descriptor, existing); 1680 } 1681 1682 // Finish loading (if necessary) by finding parents 1683 CHECK(!klass->IsLoaded()); 1684 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1685 // Loading failed. 1686 klass->SetStatus(mirror::Class::kStatusError, self); 1687 return NULL; 1688 } 1689 CHECK(klass->IsLoaded()); 1690 // Link the class (if necessary) 1691 CHECK(!klass->IsResolved()); 1692 // TODO: Use fast jobjects? 1693 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1694 1695 mirror::Class* new_class = nullptr; 1696 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 1697 // Linking failed. 1698 klass->SetStatus(mirror::Class::kStatusError, self); 1699 return NULL; 1700 } 1701 CHECK(new_class != nullptr) << descriptor; 1702 CHECK(new_class->IsResolved()) << descriptor; 1703 1704 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 1705 1706 /* 1707 * We send CLASS_PREPARE events to the debugger from here. The 1708 * definition of "preparation" is creating the static fields for a 1709 * class and initializing them to the standard default values, but not 1710 * executing any code (that comes later, during "initialization"). 1711 * 1712 * We did the static preparation in LinkClass. 1713 * 1714 * The class has been prepared and resolved but possibly not yet verified 1715 * at this point. 1716 */ 1717 Dbg::PostClassPrepare(new_class_h.Get()); 1718 1719 return new_class_h.Get(); 1720} 1721 1722uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 1723 const DexFile::ClassDef& dex_class_def) { 1724 const byte* class_data = dex_file.GetClassData(dex_class_def); 1725 size_t num_ref = 0; 1726 size_t num_32 = 0; 1727 size_t num_64 = 0; 1728 if (class_data != NULL) { 1729 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1730 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1731 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1732 char c = descriptor[0]; 1733 if (c == 'L' || c == '[') { 1734 num_ref++; 1735 } else if (c == 'J' || c == 'D') { 1736 num_64++; 1737 } else { 1738 num_32++; 1739 } 1740 } 1741 } 1742 return mirror::Class::ComputeClassSize(false, 0, num_32, num_64, num_ref); 1743} 1744 1745OatFile::OatClass ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1746 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1747 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1748 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1749 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1750 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1751 &dex_location_checksum); 1752 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1753 return oat_dex_file->GetOatClass(class_def_idx); 1754} 1755 1756static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1757 uint32_t method_idx) { 1758 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1759 const byte* class_data = dex_file.GetClassData(class_def); 1760 CHECK(class_data != NULL); 1761 ClassDataItemIterator it(dex_file, class_data); 1762 // Skip fields 1763 while (it.HasNextStaticField()) { 1764 it.Next(); 1765 } 1766 while (it.HasNextInstanceField()) { 1767 it.Next(); 1768 } 1769 // Process methods 1770 size_t class_def_method_index = 0; 1771 while (it.HasNextDirectMethod()) { 1772 if (it.GetMemberIndex() == method_idx) { 1773 return class_def_method_index; 1774 } 1775 class_def_method_index++; 1776 it.Next(); 1777 } 1778 while (it.HasNextVirtualMethod()) { 1779 if (it.GetMemberIndex() == method_idx) { 1780 return class_def_method_index; 1781 } 1782 class_def_method_index++; 1783 it.Next(); 1784 } 1785 DCHECK(!it.HasNext()); 1786 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1787 return 0; 1788} 1789 1790const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1791 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1792 // method for direct methods (or virtual methods made direct). 1793 mirror::Class* declaring_class = method->GetDeclaringClass(); 1794 size_t oat_method_index; 1795 if (method->IsStatic() || method->IsDirect()) { 1796 // Simple case where the oat method index was stashed at load time. 1797 oat_method_index = method->GetMethodIndex(); 1798 } else { 1799 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1800 // by search for its position in the declared virtual methods. 1801 oat_method_index = declaring_class->NumDirectMethods(); 1802 size_t end = declaring_class->NumVirtualMethods(); 1803 bool found = false; 1804 for (size_t i = 0; i < end; i++) { 1805 if (declaring_class->GetVirtualMethod(i) == method) { 1806 found = true; 1807 break; 1808 } 1809 oat_method_index++; 1810 } 1811 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1812 } 1813 DCHECK_EQ(oat_method_index, 1814 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1815 method->GetDeclaringClass()->GetDexClassDefIndex(), 1816 method->GetDexMethodIndex())); 1817 const OatFile::OatClass oat_class = GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1818 declaring_class->GetDexClassDefIndex()); 1819 1820 return oat_class.GetOatMethod(oat_method_index); 1821} 1822 1823// Special case to get oat code without overwriting a trampoline. 1824const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1825 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1826 if (method->IsProxyMethod()) { 1827 return GetQuickProxyInvokeHandler(); 1828 } 1829 const void* result = GetOatMethodFor(method).GetQuickCode(); 1830 if (result == nullptr) { 1831 if (method->IsNative()) { 1832 // No code and native? Use generic trampoline. 1833 result = GetQuickGenericJniTrampoline(); 1834 } else if (method->IsPortableCompiled()) { 1835 // No code? Do we expect portable code? 1836 result = GetQuickToPortableBridge(); 1837 } else { 1838 // No code? You must mean to go into the interpreter. 1839 result = GetQuickToInterpreterBridge(); 1840 } 1841 } 1842 return result; 1843} 1844 1845const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1846 bool* have_portable_code) { 1847 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1848 *have_portable_code = false; 1849 if (method->IsProxyMethod()) { 1850 return GetPortableProxyInvokeHandler(); 1851 } 1852 const OatFile::OatMethod oat_method = GetOatMethodFor(method); 1853 const void* result = oat_method.GetPortableCode(); 1854 if (result == nullptr) { 1855 if (oat_method.GetQuickCode() == nullptr) { 1856 // No code? You must mean to go into the interpreter. 1857 result = GetPortableToInterpreterBridge(); 1858 } else { 1859 // No code? But there's quick code, so use a bridge. 1860 result = GetPortableToQuickBridge(); 1861 } 1862 } else { 1863 *have_portable_code = true; 1864 } 1865 return result; 1866} 1867 1868const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1869 uint32_t method_idx) { 1870 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1871 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1872 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 1873} 1874 1875const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1876 uint32_t method_idx) { 1877 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1878 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1879 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 1880} 1881 1882// Returns true if the method must run with interpreter, false otherwise. 1883static bool NeedsInterpreter( 1884 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 1885 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1886 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1887 // No code: need interpreter. 1888 // May return true for native code, in the case of generic JNI 1889 // DCHECK(!method->IsNative()); 1890 return true; 1891 } 1892#ifdef ART_SEA_IR_MODE 1893 ScopedObjectAccess soa(Thread::Current()); 1894 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1895 LOG(INFO) << "Found " << PrettyMethod(method); 1896 return false; 1897 } 1898#endif 1899 // If interpreter mode is enabled, every method (except native and proxy) must 1900 // be run with interpreter. 1901 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1902 !method->IsNative() && !method->IsProxyMethod(); 1903} 1904 1905void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1906 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1907 if (klass->NumDirectMethods() == 0) { 1908 return; // No direct methods => no static methods. 1909 } 1910 Runtime* runtime = Runtime::Current(); 1911 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1912 return; // OAT file unavailable. 1913 } 1914 const DexFile& dex_file = klass->GetDexFile(); 1915 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 1916 CHECK(dex_class_def != nullptr); 1917 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1918 // There should always be class data if there were direct methods. 1919 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1920 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 1921 ClassDataItemIterator it(dex_file, class_data); 1922 // Skip fields 1923 while (it.HasNextStaticField()) { 1924 it.Next(); 1925 } 1926 while (it.HasNextInstanceField()) { 1927 it.Next(); 1928 } 1929 // Link the code of methods skipped by LinkCode. 1930 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1931 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1932 if (!method->IsStatic()) { 1933 // Only update static methods. 1934 continue; 1935 } 1936 const void* portable_code = oat_class.GetOatMethod(method_index).GetPortableCode(); 1937 const void* quick_code = oat_class.GetOatMethod(method_index).GetQuickCode(); 1938 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1939 bool have_portable_code = false; 1940 if (enter_interpreter) { 1941 // Use interpreter entry point. 1942 // Check whether the method is native, in which case it's generic JNI. 1943 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 1944 quick_code = GetQuickGenericJniTrampoline(); 1945 portable_code = GetPortableToQuickBridge(); 1946 } else { 1947 portable_code = GetPortableToInterpreterBridge(); 1948 quick_code = GetQuickToInterpreterBridge(); 1949 } 1950 } else { 1951 if (portable_code == nullptr) { 1952 portable_code = GetPortableToQuickBridge(); 1953 } else { 1954 have_portable_code = true; 1955 } 1956 if (quick_code == nullptr) { 1957 quick_code = GetQuickToPortableBridge(); 1958 } 1959 } 1960 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1961 have_portable_code); 1962 } 1963 // Ignore virtual methods on the iterator. 1964} 1965 1966void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 1967 const DexFile& dex_file, uint32_t dex_method_index, 1968 uint32_t method_index) { 1969 // Method shouldn't have already been linked. 1970 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1971 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1972 // Every kind of method should at least get an invoke stub from the oat_method. 1973 // non-abstract methods also get their code pointers. 1974 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1975 oat_method.LinkMethod(method.Get()); 1976 1977 // Install entry point from interpreter. 1978 Runtime* runtime = Runtime::Current(); 1979 bool enter_interpreter = NeedsInterpreter(method.Get(), 1980 method->GetEntryPointFromQuickCompiledCode(), 1981 method->GetEntryPointFromPortableCompiledCode()); 1982 if (enter_interpreter && !method->IsNative()) { 1983 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1984 } else { 1985 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1986 } 1987 1988 if (method->IsAbstract()) { 1989 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1990 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1991 return; 1992 } 1993 1994 bool have_portable_code = false; 1995 if (method->IsStatic() && !method->IsConstructor()) { 1996 // For static methods excluding the class initializer, install the trampoline. 1997 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1998 // after initializing class (see ClassLinker::InitializeClass method). 1999 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2000 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2001 } else if (enter_interpreter) { 2002 if (!method->IsNative()) { 2003 // Set entry point from compiled code if there's no code or in interpreter only mode. 2004 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2005 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2006 } else { 2007 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2008 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2009 } 2010 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2011 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2012 have_portable_code = true; 2013 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2014 } else { 2015 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2016 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2017 } 2018 2019 if (method->IsNative()) { 2020 // Unregistering restores the dlsym lookup stub. 2021 method->UnregisterNative(Thread::Current()); 2022 2023 if (enter_interpreter) { 2024 // We have a native method here without code. Then it should have either the GenericJni 2025 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2026 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2027 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2028 } 2029 } 2030 2031 // Allow instrumentation its chance to hijack code. 2032 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2033 method->GetEntryPointFromQuickCompiledCode(), 2034 method->GetEntryPointFromPortableCompiledCode(), 2035 have_portable_code); 2036} 2037 2038void ClassLinker::LoadClass(const DexFile& dex_file, 2039 const DexFile::ClassDef& dex_class_def, 2040 Handle<mirror::Class> klass, 2041 mirror::ClassLoader* class_loader) { 2042 CHECK(klass.Get() != NULL); 2043 CHECK(klass->GetDexCache() != NULL); 2044 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2045 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2046 CHECK(descriptor != NULL); 2047 2048 klass->SetClass(GetClassRoot(kJavaLangClass)); 2049 if (kUseBakerOrBrooksReadBarrier) { 2050 klass->AssertReadBarrierPointer(); 2051 } 2052 uint32_t access_flags = dex_class_def.access_flags_; 2053 // Make sure that none of our runtime-only flags are set. 2054 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2055 klass->SetAccessFlags(access_flags); 2056 klass->SetClassLoader(class_loader); 2057 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2058 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2059 2060 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2061 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2062 2063 const byte* class_data = dex_file.GetClassData(dex_class_def); 2064 if (class_data == NULL) { 2065 return; // no fields or methods - for example a marker interface 2066 } 2067 2068 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2069 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 2070 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2071 } else { 2072 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2073 } 2074} 2075 2076void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2077 const byte* class_data, 2078 Handle<mirror::Class> klass, 2079 mirror::ClassLoader* class_loader, 2080 const OatFile::OatClass* oat_class) { 2081 // Load fields. 2082 ClassDataItemIterator it(dex_file, class_data); 2083 Thread* self = Thread::Current(); 2084 if (it.NumStaticFields() != 0) { 2085 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2086 if (UNLIKELY(statics == NULL)) { 2087 CHECK(self->IsExceptionPending()); // OOME. 2088 return; 2089 } 2090 klass->SetSFields(statics); 2091 } 2092 if (it.NumInstanceFields() != 0) { 2093 mirror::ObjectArray<mirror::ArtField>* fields = 2094 AllocArtFieldArray(self, it.NumInstanceFields()); 2095 if (UNLIKELY(fields == NULL)) { 2096 CHECK(self->IsExceptionPending()); // OOME. 2097 return; 2098 } 2099 klass->SetIFields(fields); 2100 } 2101 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2102 StackHandleScope<1> hs(self); 2103 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2104 if (UNLIKELY(sfield.Get() == NULL)) { 2105 CHECK(self->IsExceptionPending()); // OOME. 2106 return; 2107 } 2108 klass->SetStaticField(i, sfield.Get()); 2109 LoadField(dex_file, it, klass, sfield); 2110 } 2111 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2112 StackHandleScope<1> hs(self); 2113 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2114 if (UNLIKELY(ifield.Get() == NULL)) { 2115 CHECK(self->IsExceptionPending()); // OOME. 2116 return; 2117 } 2118 klass->SetInstanceField(i, ifield.Get()); 2119 LoadField(dex_file, it, klass, ifield); 2120 } 2121 2122 // Load methods. 2123 if (it.NumDirectMethods() != 0) { 2124 // TODO: append direct methods to class object 2125 mirror::ObjectArray<mirror::ArtMethod>* directs = 2126 AllocArtMethodArray(self, it.NumDirectMethods()); 2127 if (UNLIKELY(directs == NULL)) { 2128 CHECK(self->IsExceptionPending()); // OOME. 2129 return; 2130 } 2131 klass->SetDirectMethods(directs); 2132 } 2133 if (it.NumVirtualMethods() != 0) { 2134 // TODO: append direct methods to class object 2135 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2136 AllocArtMethodArray(self, it.NumVirtualMethods()); 2137 if (UNLIKELY(virtuals == NULL)) { 2138 CHECK(self->IsExceptionPending()); // OOME. 2139 return; 2140 } 2141 klass->SetVirtualMethods(virtuals); 2142 } 2143 size_t class_def_method_index = 0; 2144 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2145 StackHandleScope<1> hs(self); 2146 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2147 if (UNLIKELY(method.Get() == NULL)) { 2148 CHECK(self->IsExceptionPending()); // OOME. 2149 return; 2150 } 2151 klass->SetDirectMethod(i, method.Get()); 2152 if (oat_class != nullptr) { 2153 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2154 } 2155 method->SetMethodIndex(class_def_method_index); 2156 class_def_method_index++; 2157 } 2158 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2159 StackHandleScope<1> hs(self); 2160 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2161 if (UNLIKELY(method.Get() == NULL)) { 2162 CHECK(self->IsExceptionPending()); // OOME. 2163 return; 2164 } 2165 klass->SetVirtualMethod(i, method.Get()); 2166 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2167 if (oat_class != nullptr) { 2168 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2169 } 2170 class_def_method_index++; 2171 } 2172 DCHECK(!it.HasNext()); 2173} 2174 2175void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2176 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2177 uint32_t field_idx = it.GetMemberIndex(); 2178 dst->SetDexFieldIndex(field_idx); 2179 dst->SetDeclaringClass(klass.Get()); 2180 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2181} 2182 2183mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2184 const ClassDataItemIterator& it, 2185 Handle<mirror::Class> klass) { 2186 uint32_t dex_method_idx = it.GetMemberIndex(); 2187 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2188 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2189 2190 mirror::ArtMethod* dst = AllocArtMethod(self); 2191 if (UNLIKELY(dst == NULL)) { 2192 CHECK(self->IsExceptionPending()); // OOME. 2193 return NULL; 2194 } 2195 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2196 2197 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2198 dst->SetDexMethodIndex(dex_method_idx); 2199 dst->SetDeclaringClass(klass.Get()); 2200 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2201 2202 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2203 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2204 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2205 2206 uint32_t access_flags = it.GetMemberAccessFlags(); 2207 2208 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2209 // Set finalizable flag on declaring class. 2210 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2211 // Void return type. 2212 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 2213 klass->SetFinalizable(); 2214 } else { 2215 std::string klass_descriptor = klass->GetDescriptor(); 2216 // The Enum class declares a "final" finalize() method to prevent subclasses from 2217 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2218 // subclasses, so we exclude it here. 2219 // We also want to avoid setting the flag on Object, where we know that finalize() is 2220 // empty. 2221 if (klass_descriptor.compare("Ljava/lang/Object;") != 0 && 2222 klass_descriptor.compare("Ljava/lang/Enum;") != 0) { 2223 klass->SetFinalizable(); 2224 } 2225 } 2226 } 2227 } else if (method_name[0] == '<') { 2228 // Fix broken access flags for initializers. Bug 11157540. 2229 bool is_init = (strcmp("<init>", method_name) == 0); 2230 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2231 if (UNLIKELY(!is_init && !is_clinit)) { 2232 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2233 } else { 2234 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2235 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2236 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2237 access_flags |= kAccConstructor; 2238 } 2239 } 2240 } 2241 dst->SetAccessFlags(access_flags); 2242 2243 self->EndAssertNoThreadSuspension(old_cause); 2244 return dst; 2245} 2246 2247void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2248 Thread* self = Thread::Current(); 2249 StackHandleScope<1> hs(self); 2250 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2251 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2252 AppendToBootClassPath(dex_file, dex_cache); 2253} 2254 2255void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2256 Handle<mirror::DexCache> dex_cache) { 2257 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2258 boot_class_path_.push_back(&dex_file); 2259 RegisterDexFile(dex_file, dex_cache); 2260} 2261 2262bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2263 dex_lock_.AssertSharedHeld(Thread::Current()); 2264 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2265 mirror::DexCache* dex_cache = GetDexCache(i); 2266 if (dex_cache->GetDexFile() == &dex_file) { 2267 return true; 2268 } 2269 } 2270 return false; 2271} 2272 2273bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2274 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2275 return IsDexFileRegisteredLocked(dex_file); 2276} 2277 2278void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2279 Handle<mirror::DexCache> dex_cache) { 2280 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2281 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2282 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2283 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2284 dex_caches_.push_back(dex_cache.Get()); 2285 dex_cache->SetDexFile(&dex_file); 2286 if (log_new_dex_caches_roots_) { 2287 // TODO: This is not safe if we can remove dex caches. 2288 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2289 } 2290} 2291 2292void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2293 Thread* self = Thread::Current(); 2294 { 2295 ReaderMutexLock mu(self, dex_lock_); 2296 if (IsDexFileRegisteredLocked(dex_file)) { 2297 return; 2298 } 2299 } 2300 // Don't alloc while holding the lock, since allocation may need to 2301 // suspend all threads and another thread may need the dex_lock_ to 2302 // get to a suspend point. 2303 StackHandleScope<1> hs(self); 2304 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2305 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2306 { 2307 WriterMutexLock mu(self, dex_lock_); 2308 if (IsDexFileRegisteredLocked(dex_file)) { 2309 return; 2310 } 2311 RegisterDexFileLocked(dex_file, dex_cache); 2312 } 2313} 2314 2315void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2316 Handle<mirror::DexCache> dex_cache) { 2317 WriterMutexLock mu(Thread::Current(), dex_lock_); 2318 RegisterDexFileLocked(dex_file, dex_cache); 2319} 2320 2321mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2322 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2323 // Search assuming unique-ness of dex file. 2324 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2325 mirror::DexCache* dex_cache = GetDexCache(i); 2326 if (dex_cache->GetDexFile() == &dex_file) { 2327 return dex_cache; 2328 } 2329 } 2330 // Search matching by location name. 2331 std::string location(dex_file.GetLocation()); 2332 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2333 mirror::DexCache* dex_cache = GetDexCache(i); 2334 if (dex_cache->GetDexFile()->GetLocation() == location) { 2335 return dex_cache; 2336 } 2337 } 2338 // Failure, dump diagnostic and abort. 2339 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2340 mirror::DexCache* dex_cache = GetDexCache(i); 2341 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2342 } 2343 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2344 return NULL; 2345} 2346 2347void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2348 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2349 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2350 mirror::DexCache* dex_cache = GetDexCache(i); 2351 dex_cache->Fixup(resolution_method); 2352 } 2353} 2354 2355mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2356 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 2357 if (UNLIKELY(klass == NULL)) { 2358 return NULL; 2359 } 2360 return InitializePrimitiveClass(klass, type); 2361} 2362 2363mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2364 Primitive::Type type) { 2365 CHECK(primitive_class != NULL); 2366 // Must hold lock on object when initializing. 2367 Thread* self = Thread::Current(); 2368 StackHandleScope<1> hs(self); 2369 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2370 ObjectLock<mirror::Class> lock(self, h_class); 2371 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2372 primitive_class->SetPrimitiveType(type); 2373 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2374 const char* descriptor = Primitive::Descriptor(type); 2375 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2376 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2377 return primitive_class; 2378} 2379 2380// Create an array class (i.e. the class object for the array, not the 2381// array itself). "descriptor" looks like "[C" or "[[[[B" or 2382// "[Ljava/lang/String;". 2383// 2384// If "descriptor" refers to an array of primitives, look up the 2385// primitive type's internally-generated class object. 2386// 2387// "class_loader" is the class loader of the class that's referring to 2388// us. It's used to ensure that we're looking for the element type in 2389// the right context. It does NOT become the class loader for the 2390// array class; that always comes from the base element class. 2391// 2392// Returns NULL with an exception raised on failure. 2393mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2394 Handle<mirror::ClassLoader> class_loader) { 2395 // Identify the underlying component type 2396 CHECK_EQ('[', descriptor[0]); 2397 StackHandleScope<2> hs(self); 2398 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2399 if (component_type.Get() == nullptr) { 2400 DCHECK(self->IsExceptionPending()); 2401 return nullptr; 2402 } 2403 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2404 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2405 return nullptr; 2406 } 2407 // See if the component type is already loaded. Array classes are 2408 // always associated with the class loader of their underlying 2409 // element type -- an array of Strings goes with the loader for 2410 // java/lang/String -- so we need to look for it there. (The 2411 // caller should have checked for the existence of the class 2412 // before calling here, but they did so with *their* class loader, 2413 // not the component type's loader.) 2414 // 2415 // If we find it, the caller adds "loader" to the class' initiating 2416 // loader list, which should prevent us from going through this again. 2417 // 2418 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2419 // are the same, because our caller (FindClass) just did the 2420 // lookup. (Even if we get this wrong we still have correct behavior, 2421 // because we effectively do this lookup again when we add the new 2422 // class to the hash table --- necessary because of possible races with 2423 // other threads.) 2424 if (class_loader.Get() != component_type->GetClassLoader()) { 2425 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2426 if (new_class != NULL) { 2427 return new_class; 2428 } 2429 } 2430 2431 // Fill out the fields in the Class. 2432 // 2433 // It is possible to execute some methods against arrays, because 2434 // all arrays are subclasses of java_lang_Object_, so we need to set 2435 // up a vtable. We can just point at the one in java_lang_Object_. 2436 // 2437 // Array classes are simple enough that we don't need to do a full 2438 // link step. 2439 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2440 if (UNLIKELY(!init_done_)) { 2441 // Classes that were hand created, ie not by FindSystemClass 2442 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2443 new_class.Assign(GetClassRoot(kClassArrayClass)); 2444 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2445 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2446 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2447 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2448 } else if (strcmp(descriptor, 2449 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2450 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2451 } else if (strcmp(descriptor, 2452 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2453 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2454 } else if (strcmp(descriptor, "[C") == 0) { 2455 new_class.Assign(GetClassRoot(kCharArrayClass)); 2456 } else if (strcmp(descriptor, "[I") == 0) { 2457 new_class.Assign(GetClassRoot(kIntArrayClass)); 2458 } 2459 } 2460 if (new_class.Get() == nullptr) { 2461 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 2462 if (new_class.Get() == nullptr) { 2463 return nullptr; 2464 } 2465 new_class->SetComponentType(component_type.Get()); 2466 } 2467 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2468 DCHECK(new_class->GetComponentType() != NULL); 2469 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2470 new_class->SetSuperClass(java_lang_Object); 2471 new_class->SetVTable(java_lang_Object->GetVTable()); 2472 new_class->SetPrimitiveType(Primitive::kPrimNot); 2473 new_class->SetClassLoader(component_type->GetClassLoader()); 2474 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 2475 new_class->PopulateEmbeddedImtAndVTable(); 2476 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2477 // don't need to set new_class->SetObjectSize(..) 2478 // because Object::SizeOf delegates to Array::SizeOf 2479 2480 2481 // All arrays have java/lang/Cloneable and java/io/Serializable as 2482 // interfaces. We need to set that up here, so that stuff like 2483 // "instanceof" works right. 2484 // 2485 // Note: The GC could run during the call to FindSystemClass, 2486 // so we need to make sure the class object is GC-valid while we're in 2487 // there. Do this by clearing the interface list so the GC will just 2488 // think that the entries are null. 2489 2490 2491 // Use the single, global copies of "interfaces" and "iftable" 2492 // (remember not to free them for arrays). 2493 { 2494 mirror::IfTable* array_iftable = 2495 ReadBarrier::BarrierForRoot<mirror::IfTable, kWithReadBarrier>(&array_iftable_); 2496 CHECK(array_iftable != nullptr); 2497 new_class->SetIfTable(array_iftable); 2498 } 2499 2500 // Inherit access flags from the component type. 2501 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2502 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2503 access_flags &= kAccJavaFlagsMask; 2504 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2505 // and remove "interface". 2506 access_flags |= kAccAbstract | kAccFinal; 2507 access_flags &= ~kAccInterface; 2508 2509 new_class->SetAccessFlags(access_flags); 2510 2511 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2512 if (existing == nullptr) { 2513 return new_class.Get(); 2514 } 2515 // Another thread must have loaded the class after we 2516 // started but before we finished. Abandon what we've 2517 // done. 2518 // 2519 // (Yes, this happens.) 2520 2521 return existing; 2522} 2523 2524mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2525 switch (type) { 2526 case 'B': 2527 return GetClassRoot(kPrimitiveByte); 2528 case 'C': 2529 return GetClassRoot(kPrimitiveChar); 2530 case 'D': 2531 return GetClassRoot(kPrimitiveDouble); 2532 case 'F': 2533 return GetClassRoot(kPrimitiveFloat); 2534 case 'I': 2535 return GetClassRoot(kPrimitiveInt); 2536 case 'J': 2537 return GetClassRoot(kPrimitiveLong); 2538 case 'S': 2539 return GetClassRoot(kPrimitiveShort); 2540 case 'Z': 2541 return GetClassRoot(kPrimitiveBoolean); 2542 case 'V': 2543 return GetClassRoot(kPrimitiveVoid); 2544 default: 2545 break; 2546 } 2547 std::string printable_type(PrintableChar(type)); 2548 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2549 return NULL; 2550} 2551 2552mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2553 size_t hash) { 2554 if (VLOG_IS_ON(class_linker)) { 2555 mirror::DexCache* dex_cache = klass->GetDexCache(); 2556 std::string source; 2557 if (dex_cache != NULL) { 2558 source += " from "; 2559 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2560 } 2561 LOG(INFO) << "Loaded class " << descriptor << source; 2562 } 2563 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2564 mirror::Class* existing = 2565 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2566 if (existing != NULL) { 2567 return existing; 2568 } 2569 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == NULL && 2570 dex_cache_image_class_lookup_required_) { 2571 // Check a class loaded with the system class loader matches one in the image if the class 2572 // is in the image. 2573 existing = LookupClassFromImage(descriptor); 2574 if (existing != NULL) { 2575 CHECK(klass == existing); 2576 } 2577 } 2578 VerifyObject(klass); 2579 class_table_.insert(std::make_pair(hash, klass)); 2580 if (log_new_class_table_roots_) { 2581 new_class_roots_.push_back(std::make_pair(hash, klass)); 2582 } 2583 return NULL; 2584} 2585 2586mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 2587 size_t hash) { 2588 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2589 mirror::Class* existing = 2590 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2591 2592 if (existing == nullptr) { 2593 CHECK(klass->IsProxyClass()); 2594 return nullptr; 2595 } 2596 2597 CHECK_NE(existing, klass) << descriptor; 2598 CHECK(!existing->IsResolved()) << descriptor; 2599 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 2600 2601 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2602 ++it) { 2603 mirror::Class* entry = it->second; 2604 if (entry == existing) { 2605 class_table_.erase(it); 2606 break; 2607 } 2608 } 2609 2610 CHECK(!klass->IsTemp()) << descriptor; 2611 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 2612 dex_cache_image_class_lookup_required_) { 2613 // Check a class loaded with the system class loader matches one in the image if the class 2614 // is in the image. 2615 existing = LookupClassFromImage(descriptor); 2616 if (existing != nullptr) { 2617 CHECK(klass == existing) << descriptor; 2618 } 2619 } 2620 VerifyObject(klass); 2621 2622 class_table_.insert(std::make_pair(hash, klass)); 2623 if (log_new_class_table_roots_) { 2624 new_class_roots_.push_back(std::make_pair(hash, klass)); 2625 } 2626 2627 return existing; 2628} 2629 2630bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2631 size_t hash = Hash(descriptor); 2632 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2633 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2634 it != end && it->first == hash; 2635 ++it) { 2636 mirror::Class** root = &it->second; 2637 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2638 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2639 class_table_.erase(it); 2640 return true; 2641 } 2642 } 2643 return false; 2644} 2645 2646mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2647 const mirror::ClassLoader* class_loader) { 2648 size_t hash = Hash(descriptor); 2649 { 2650 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2651 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2652 if (result != NULL) { 2653 return result; 2654 } 2655 } 2656 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2657 return NULL; 2658 } else { 2659 // Lookup failed but need to search dex_caches_. 2660 mirror::Class* result = LookupClassFromImage(descriptor); 2661 if (result != NULL) { 2662 InsertClass(descriptor, result, hash); 2663 } else { 2664 // Searching the image dex files/caches failed, we don't want to get into this situation 2665 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2666 // classes into the class table. 2667 const int32_t kMaxFailedDexCacheLookups = 1000; 2668 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2669 MoveImageClassesToClassTable(); 2670 } 2671 } 2672 return result; 2673 } 2674} 2675 2676mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2677 const mirror::ClassLoader* class_loader, 2678 size_t hash) { 2679 auto end = class_table_.end(); 2680 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2681 mirror::Class** root = &it->second; 2682 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2683 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2684 if (kIsDebugBuild) { 2685 // Check for duplicates in the table. 2686 for (++it; it != end && it->first == hash; ++it) { 2687 mirror::Class** root2 = &it->second; 2688 mirror::Class* klass2 = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root2); 2689 CHECK(!(klass2->GetClassLoader() == class_loader && 2690 klass2->DescriptorEquals(descriptor))) 2691 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2692 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2693 } 2694 } 2695 return klass; 2696 } 2697 } 2698 return NULL; 2699} 2700 2701static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2702 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2703 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2704 CHECK(image != NULL); 2705 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2706 return root->AsObjectArray<mirror::DexCache>(); 2707} 2708 2709void ClassLinker::MoveImageClassesToClassTable() { 2710 Thread* self = Thread::Current(); 2711 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2712 if (!dex_cache_image_class_lookup_required_) { 2713 return; // All dex cache classes are already in the class table. 2714 } 2715 const char* old_no_suspend_cause = 2716 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2717 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2718 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2719 mirror::DexCache* dex_cache = dex_caches->Get(i); 2720 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2721 for (int32_t j = 0; j < types->GetLength(); j++) { 2722 mirror::Class* klass = types->Get(j); 2723 if (klass != NULL) { 2724 DCHECK(klass->GetClassLoader() == NULL); 2725 std::string descriptor = klass->GetDescriptor(); 2726 size_t hash = Hash(descriptor.c_str()); 2727 mirror::Class* existing = LookupClassFromTableLocked(descriptor.c_str(), NULL, hash); 2728 if (existing != NULL) { 2729 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2730 << PrettyClassAndClassLoader(klass); 2731 } else { 2732 class_table_.insert(std::make_pair(hash, klass)); 2733 if (log_new_class_table_roots_) { 2734 new_class_roots_.push_back(std::make_pair(hash, klass)); 2735 } 2736 } 2737 } 2738 } 2739 } 2740 dex_cache_image_class_lookup_required_ = false; 2741 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2742} 2743 2744mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2745 Thread* self = Thread::Current(); 2746 const char* old_no_suspend_cause = 2747 self->StartAssertNoThreadSuspension("Image class lookup"); 2748 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2749 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2750 mirror::DexCache* dex_cache = dex_caches->Get(i); 2751 const DexFile* dex_file = dex_cache->GetDexFile(); 2752 // Try binary searching the string/type index. 2753 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2754 if (string_id != NULL) { 2755 const DexFile::TypeId* type_id = 2756 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2757 if (type_id != NULL) { 2758 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2759 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2760 if (klass != NULL) { 2761 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2762 return klass; 2763 } 2764 } 2765 } 2766 } 2767 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2768 return NULL; 2769} 2770 2771void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2772 result.clear(); 2773 if (dex_cache_image_class_lookup_required_) { 2774 MoveImageClassesToClassTable(); 2775 } 2776 size_t hash = Hash(descriptor); 2777 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2778 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2779 it != end && it->first == hash; ++it) { 2780 mirror::Class** root = &it->second; 2781 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2782 if (klass->DescriptorEquals(descriptor)) { 2783 result.push_back(klass); 2784 } 2785 } 2786} 2787 2788void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 2789 // TODO: assert that the monitor on the Class is held 2790 Thread* self = Thread::Current(); 2791 ObjectLock<mirror::Class> lock(self, klass); 2792 2793 // Don't attempt to re-verify if already sufficiently verified. 2794 if (klass->IsVerified() || 2795 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2796 return; 2797 } 2798 2799 // The class might already be erroneous, for example at compile time if we attempted to verify 2800 // this class as a parent to another. 2801 if (klass->IsErroneous()) { 2802 ThrowEarlierClassFailure(klass.Get()); 2803 return; 2804 } 2805 2806 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2807 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2808 } else { 2809 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2810 << PrettyClass(klass.Get()); 2811 CHECK(!Runtime::Current()->IsCompiler()); 2812 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2813 } 2814 2815 // Skip verification if disabled. 2816 if (!Runtime::Current()->IsVerificationEnabled()) { 2817 klass->SetStatus(mirror::Class::kStatusVerified, self); 2818 return; 2819 } 2820 2821 // Verify super class. 2822 StackHandleScope<2> hs(self); 2823 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 2824 if (super.Get() != NULL) { 2825 // Acquire lock to prevent races on verifying the super class. 2826 ObjectLock<mirror::Class> lock(self, super); 2827 2828 if (!super->IsVerified() && !super->IsErroneous()) { 2829 VerifyClass(super); 2830 } 2831 if (!super->IsCompileTimeVerified()) { 2832 std::string error_msg( 2833 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2834 PrettyDescriptor(klass.Get()).c_str(), 2835 PrettyDescriptor(super.Get()).c_str())); 2836 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2837 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 2838 if (cause.Get() != nullptr) { 2839 self->ClearException(); 2840 } 2841 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2842 if (cause.Get() != nullptr) { 2843 self->GetException(nullptr)->SetCause(cause.Get()); 2844 } 2845 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2846 if (Runtime::Current()->IsCompiler()) { 2847 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2848 } 2849 klass->SetStatus(mirror::Class::kStatusError, self); 2850 return; 2851 } 2852 } 2853 2854 // Try to use verification information from the oat file, otherwise do runtime verification. 2855 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2856 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2857 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 2858 if (oat_file_class_status == mirror::Class::kStatusError) { 2859 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2860 << PrettyDescriptor(klass.Get()) << " in " 2861 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2862 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 2863 PrettyDescriptor(klass.Get()).c_str()); 2864 klass->SetStatus(mirror::Class::kStatusError, self); 2865 return; 2866 } 2867 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2868 std::string error_msg; 2869 if (!preverified) { 2870 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 2871 Runtime::Current()->IsCompiler(), 2872 &error_msg); 2873 } 2874 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2875 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2876 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 2877 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2878 << " because: " << error_msg; 2879 } 2880 self->AssertNoPendingException(); 2881 // Make sure all classes referenced by catch blocks are resolved. 2882 ResolveClassExceptionHandlerTypes(dex_file, klass); 2883 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2884 // Even though there were no verifier failures we need to respect whether the super-class 2885 // was verified or requiring runtime reverification. 2886 if (super.Get() == NULL || super->IsVerified()) { 2887 klass->SetStatus(mirror::Class::kStatusVerified, self); 2888 } else { 2889 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2890 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2891 // Pretend a soft failure occured so that we don't consider the class verified below. 2892 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2893 } 2894 } else { 2895 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2896 // Soft failures at compile time should be retried at runtime. Soft 2897 // failures at runtime will be handled by slow paths in the generated 2898 // code. Set status accordingly. 2899 if (Runtime::Current()->IsCompiler()) { 2900 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2901 } else { 2902 klass->SetStatus(mirror::Class::kStatusVerified, self); 2903 } 2904 } 2905 } else { 2906 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 2907 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2908 << " because: " << error_msg; 2909 self->AssertNoPendingException(); 2910 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2911 klass->SetStatus(mirror::Class::kStatusError, self); 2912 } 2913 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2914 // Class is verified so we don't need to do any access check on its methods. 2915 // Let the interpreter know it by setting the kAccPreverified flag onto each 2916 // method. 2917 // Note: we're going here during compilation and at runtime. When we set the 2918 // kAccPreverified flag when compiling image classes, the flag is recorded 2919 // in the image and is set when loading the image. 2920 klass->SetPreverifiedFlagOnAllMethods(); 2921 } 2922} 2923 2924bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2925 mirror::Class::Status& oat_file_class_status) { 2926 // If we're compiling, we can only verify the class using the oat file if 2927 // we are not compiling the image or if the class we're verifying is not part of 2928 // the app. In other words, we will only check for preverification of bootclasspath 2929 // classes. 2930 if (Runtime::Current()->IsCompiler()) { 2931 // Are we compiling the bootclasspath? 2932 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2933 return false; 2934 } 2935 // We are compiling an app (not the image). 2936 2937 // Is this an app class? (I.e. not a bootclasspath class) 2938 if (klass->GetClassLoader() != NULL) { 2939 return false; 2940 } 2941 } 2942 2943 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2944 // Make this work with gtests, which do not set up the image properly. 2945 // TODO: we should clean up gtests to set up the image path properly. 2946 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2947 return false; 2948 } 2949 2950 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2951 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2952 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2953 &dex_location_checksum); 2954 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2955 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2956 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 2957 if (oat_file_class_status == mirror::Class::kStatusVerified || 2958 oat_file_class_status == mirror::Class::kStatusInitialized) { 2959 return true; 2960 } 2961 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2962 // Compile time verification failed with a soft error. Compile time verification can fail 2963 // because we have incomplete type information. Consider the following: 2964 // class ... { 2965 // Foo x; 2966 // .... () { 2967 // if (...) { 2968 // v1 gets assigned a type of resolved class Foo 2969 // } else { 2970 // v1 gets assigned a type of unresolved class Bar 2971 // } 2972 // iput x = v1 2973 // } } 2974 // when we merge v1 following the if-the-else it results in Conflict 2975 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2976 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2977 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2978 // at compile time). 2979 return false; 2980 } 2981 if (oat_file_class_status == mirror::Class::kStatusError) { 2982 // Compile time verification failed with a hard error. This is caused by invalid instructions 2983 // in the class. These errors are unrecoverable. 2984 return false; 2985 } 2986 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2987 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2988 // not loading the class. 2989 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2990 // isn't a problem and this case shouldn't occur 2991 return false; 2992 } 2993 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2994 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2995 << klass->GetDescriptor(); 2996 2997 return false; 2998} 2999 3000void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3001 Handle<mirror::Class> klass) { 3002 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3003 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3004 } 3005 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3006 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3007 } 3008} 3009 3010void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3011 mirror::ArtMethod* method) { 3012 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3013 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3014 if (code_item == NULL) { 3015 return; // native or abstract method 3016 } 3017 if (code_item->tries_size_ == 0) { 3018 return; // nothing to process 3019 } 3020 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3021 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3022 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3023 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3024 CatchHandlerIterator iterator(handlers_ptr); 3025 for (; iterator.HasNext(); iterator.Next()) { 3026 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3027 // unresolved exception types will be ignored by exception delivery 3028 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3029 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3030 if (exception_type == NULL) { 3031 DCHECK(Thread::Current()->IsExceptionPending()); 3032 Thread::Current()->ClearException(); 3033 } 3034 } 3035 } 3036 handlers_ptr = iterator.EndDataPointer(); 3037 } 3038} 3039 3040static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3041static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3042 Handle<mirror::ArtMethod> prototype); 3043 3044mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3045 jobjectArray interfaces, jobject loader, 3046 jobjectArray methods, jobjectArray throws) { 3047 Thread* self = soa.Self(); 3048 StackHandleScope<8> hs(self); 3049 Handle<mirror::Class> klass(hs.NewHandle( 3050 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3051 if (klass.Get() == NULL) { 3052 CHECK(self->IsExceptionPending()); // OOME. 3053 return NULL; 3054 } 3055 DCHECK(klass->GetClass() != NULL); 3056 klass->SetObjectSize(sizeof(mirror::Proxy)); 3057 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 3058 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3059 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3060 klass->SetName(soa.Decode<mirror::String*>(name)); 3061 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3062 klass->SetDexCache(proxy_class->GetDexCache()); 3063 klass->SetStatus(mirror::Class::kStatusIdx, self); 3064 3065 // Instance fields are inherited, but we add a couple of static fields... 3066 { 3067 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3068 if (UNLIKELY(sfields == NULL)) { 3069 CHECK(self->IsExceptionPending()); // OOME. 3070 return NULL; 3071 } 3072 klass->SetSFields(sfields); 3073 } 3074 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3075 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3076 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3077 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3078 CHECK(self->IsExceptionPending()); // OOME. 3079 return nullptr; 3080 } 3081 klass->SetStaticField(0, interfaces_sfield.Get()); 3082 interfaces_sfield->SetDexFieldIndex(0); 3083 interfaces_sfield->SetDeclaringClass(klass.Get()); 3084 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3085 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3086 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3087 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3088 CHECK(self->IsExceptionPending()); // OOME. 3089 return nullptr; 3090 } 3091 klass->SetStaticField(1, throws_sfield.Get()); 3092 throws_sfield->SetDexFieldIndex(1); 3093 throws_sfield->SetDeclaringClass(klass.Get()); 3094 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3095 3096 // Proxies have 1 direct method, the constructor 3097 { 3098 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3099 if (UNLIKELY(directs == nullptr)) { 3100 CHECK(self->IsExceptionPending()); // OOME. 3101 return nullptr; 3102 } 3103 klass->SetDirectMethods(directs); 3104 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3105 if (UNLIKELY(constructor == nullptr)) { 3106 CHECK(self->IsExceptionPending()); // OOME. 3107 return nullptr; 3108 } 3109 klass->SetDirectMethod(0, constructor); 3110 } 3111 3112 // Create virtual method using specified prototypes. 3113 size_t num_virtual_methods = 3114 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3115 { 3116 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3117 num_virtual_methods); 3118 if (UNLIKELY(virtuals == NULL)) { 3119 CHECK(self->IsExceptionPending()); // OOME. 3120 return NULL; 3121 } 3122 klass->SetVirtualMethods(virtuals); 3123 } 3124 for (size_t i = 0; i < num_virtual_methods; ++i) { 3125 StackHandleScope<1> hs(self); 3126 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3127 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3128 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3129 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3130 if (UNLIKELY(clone == nullptr)) { 3131 CHECK(self->IsExceptionPending()); // OOME. 3132 return nullptr; 3133 } 3134 klass->SetVirtualMethod(i, clone); 3135 } 3136 3137 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3138 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3139 self->AssertNoPendingException(); 3140 3141 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3142 mirror::Class* new_class = nullptr; 3143 { 3144 ObjectLock<mirror::Class> resolution_lock(self, klass); // Must hold lock on object when resolved. 3145 // Link the fields and virtual methods, creating vtable and iftables 3146 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3147 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3148 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3149 klass->SetStatus(mirror::Class::kStatusError, self); 3150 return nullptr; 3151 } 3152 } 3153 3154 CHECK(klass->IsRetired()); 3155 CHECK_NE(klass.Get(), new_class); 3156 klass.Assign(new_class); 3157 3158 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3159 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3160 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3161 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3162 3163 { 3164 // Lock on klass is released. Lock new class object. 3165 ObjectLock<mirror::Class> initialization_lock(self, klass); 3166 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3167 } 3168 3169 // sanity checks 3170 if (kIsDebugBuild) { 3171 CHECK(klass->GetIFields() == nullptr); 3172 CheckProxyConstructor(klass->GetDirectMethod(0)); 3173 for (size_t i = 0; i < num_virtual_methods; ++i) { 3174 StackHandleScope<2> hs(self); 3175 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3176 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3177 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3178 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3179 CheckProxyMethod(virtual_method, prototype); 3180 } 3181 3182 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3183 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3184 decoded_name->ToModifiedUtf8().c_str())); 3185 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3186 3187 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3188 decoded_name->ToModifiedUtf8().c_str())); 3189 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3190 3191 CHECK_EQ(klass.Get()->GetInterfaces(), 3192 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3193 CHECK_EQ(klass.Get()->GetThrows(), 3194 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3195 } 3196 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3197 CHECK(existing == nullptr); 3198 return klass.Get(); 3199} 3200 3201std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3202 DCHECK(proxy_class->IsProxyClass()); 3203 mirror::String* name = proxy_class->GetName(); 3204 DCHECK(name != NULL); 3205 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3206} 3207 3208mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3209 mirror::ArtMethod* proxy_method) { 3210 DCHECK(proxy_class->IsProxyClass()); 3211 DCHECK(proxy_method->IsProxyMethod()); 3212 // Locate the dex cache of the original interface/Object 3213 mirror::DexCache* dex_cache = NULL; 3214 { 3215 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 3216 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3217 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3218 mirror::DexCache* a_dex_cache = GetDexCache(i); 3219 if (a_dex_cache->GetResolvedTypes() == resolved_types) { 3220 dex_cache = a_dex_cache; 3221 break; 3222 } 3223 } 3224 } 3225 CHECK(dex_cache != NULL); 3226 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3227 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3228 CHECK(resolved_method != NULL); 3229 return resolved_method; 3230} 3231 3232 3233mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3234 Handle<mirror::Class> klass, 3235 mirror::Class* proxy_class) { 3236 // Create constructor for Proxy that must initialize h 3237 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3238 proxy_class->GetDirectMethods(); 3239 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3240 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3241 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3242 // code_ too) 3243 mirror::ArtMethod* constructor = 3244 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3245 if (constructor == NULL) { 3246 CHECK(self->IsExceptionPending()); // OOME. 3247 return NULL; 3248 } 3249 // Make this constructor public and fix the class to be our Proxy version 3250 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3251 constructor->SetDeclaringClass(klass.Get()); 3252 return constructor; 3253} 3254 3255static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3256 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3257 CHECK(constructor->IsConstructor()); 3258 CHECK_STREQ(constructor->GetName(), "<init>"); 3259 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3260 "(Ljava/lang/reflect/InvocationHandler;)V"); 3261 DCHECK(constructor->IsPublic()); 3262} 3263 3264mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3265 Handle<mirror::Class> klass, 3266 Handle<mirror::ArtMethod> prototype) { 3267 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3268 // prototype method 3269 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3270 prototype.Get()); 3271 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3272 // as necessary 3273 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3274 if (UNLIKELY(method == NULL)) { 3275 CHECK(self->IsExceptionPending()); // OOME. 3276 return NULL; 3277 } 3278 3279 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3280 // the intersection of throw exceptions as defined in Proxy 3281 method->SetDeclaringClass(klass.Get()); 3282 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3283 3284 // At runtime the method looks like a reference and argument saving method, clone the code 3285 // related parameters from this method. 3286 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3287 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3288 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3289 3290 return method; 3291} 3292 3293static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3294 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3295 // Basic sanity 3296 CHECK(!prototype->IsFinal()); 3297 CHECK(method->IsFinal()); 3298 CHECK(!method->IsAbstract()); 3299 3300 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3301 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3302 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3303 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 3304 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 3305 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3306 3307 MethodHelper mh(method); 3308 MethodHelper mh2(prototype); 3309 CHECK_STREQ(method->GetName(), prototype->GetName()); 3310 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3311 // More complex sanity - via dex cache 3312 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3313} 3314 3315static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3316 bool can_init_parents) 3317 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3318 if (can_init_statics && can_init_parents) { 3319 return true; 3320 } 3321 if (!can_init_statics) { 3322 // Check if there's a class initializer. 3323 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3324 if (clinit != NULL) { 3325 return false; 3326 } 3327 // Check if there are encoded static values needing initialization. 3328 if (klass->NumStaticFields() != 0) { 3329 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3330 DCHECK(dex_class_def != NULL); 3331 if (dex_class_def->static_values_off_ != 0) { 3332 return false; 3333 } 3334 } 3335 } 3336 if (!klass->IsInterface() && klass->HasSuperClass()) { 3337 mirror::Class* super_class = klass->GetSuperClass(); 3338 if (!can_init_parents && !super_class->IsInitialized()) { 3339 return false; 3340 } else { 3341 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3342 return false; 3343 } 3344 } 3345 } 3346 return true; 3347} 3348 3349bool ClassLinker::IsInitialized() const { 3350 return init_done_; 3351} 3352 3353bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3354 bool can_init_parents) { 3355 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3356 3357 // Are we already initialized and therefore done? 3358 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3359 // an initialized class will never change its state. 3360 if (klass->IsInitialized()) { 3361 return true; 3362 } 3363 3364 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3365 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3366 return false; 3367 } 3368 3369 Thread* self = Thread::Current(); 3370 uint64_t t0; 3371 { 3372 ObjectLock<mirror::Class> lock(self, klass); 3373 3374 // Re-check under the lock in case another thread initialized ahead of us. 3375 if (klass->IsInitialized()) { 3376 return true; 3377 } 3378 3379 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3380 if (klass->IsErroneous()) { 3381 ThrowEarlierClassFailure(klass.Get()); 3382 return false; 3383 } 3384 3385 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3386 3387 if (!klass->IsVerified()) { 3388 VerifyClass(klass); 3389 if (!klass->IsVerified()) { 3390 // We failed to verify, expect either the klass to be erroneous or verification failed at 3391 // compile time. 3392 if (klass->IsErroneous()) { 3393 CHECK(self->IsExceptionPending()); 3394 } else { 3395 CHECK(Runtime::Current()->IsCompiler()); 3396 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3397 } 3398 return false; 3399 } 3400 } 3401 3402 // If the class is kStatusInitializing, either this thread is 3403 // initializing higher up the stack or another thread has beat us 3404 // to initializing and we need to wait. Either way, this 3405 // invocation of InitializeClass will not be responsible for 3406 // running <clinit> and will return. 3407 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3408 // We caught somebody else in the act; was it us? 3409 if (klass->GetClinitThreadId() == self->GetTid()) { 3410 // Yes. That's fine. Return so we can continue initializing. 3411 return true; 3412 } 3413 // No. That's fine. Wait for another thread to finish initializing. 3414 return WaitForInitializeClass(klass, self, lock); 3415 } 3416 3417 if (!ValidateSuperClassDescriptors(klass)) { 3418 klass->SetStatus(mirror::Class::kStatusError, self); 3419 return false; 3420 } 3421 3422 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3423 3424 // From here out other threads may observe that we're initializing and so changes of state 3425 // require the a notification. 3426 klass->SetClinitThreadId(self->GetTid()); 3427 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3428 3429 t0 = NanoTime(); 3430 } 3431 3432 // Initialize super classes, must be done while initializing for the JLS. 3433 if (!klass->IsInterface() && klass->HasSuperClass()) { 3434 mirror::Class* super_class = klass->GetSuperClass(); 3435 if (!super_class->IsInitialized()) { 3436 CHECK(!super_class->IsInterface()); 3437 CHECK(can_init_parents); 3438 StackHandleScope<1> hs(self); 3439 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3440 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3441 if (!super_initialized) { 3442 // The super class was verified ahead of entering initializing, we should only be here if 3443 // the super class became erroneous due to initialization. 3444 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3445 << "Super class initialization failed for " 3446 << PrettyDescriptor(handle_scope_super.Get()) 3447 << " that has unexpected status " << handle_scope_super->GetStatus() 3448 << "\nPending exception:\n" 3449 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3450 ObjectLock<mirror::Class> lock(self, klass); 3451 // Initialization failed because the super-class is erroneous. 3452 klass->SetStatus(mirror::Class::kStatusError, self); 3453 return false; 3454 } 3455 } 3456 } 3457 3458 if (klass->NumStaticFields() > 0) { 3459 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3460 CHECK(dex_class_def != NULL); 3461 const DexFile& dex_file = klass->GetDexFile(); 3462 StackHandleScope<2> hs(self); 3463 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3464 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3465 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3466 this, *dex_class_def); 3467 if (it.HasNext()) { 3468 CHECK(can_init_statics); 3469 // We reordered the fields, so we need to be able to map the 3470 // field indexes to the right fields. 3471 SafeMap<uint32_t, mirror::ArtField*> field_map; 3472 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3473 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3474 if (Runtime::Current()->IsActiveTransaction()) { 3475 it.ReadValueToField<true>(field_map.Get(i)); 3476 } else { 3477 it.ReadValueToField<false>(field_map.Get(i)); 3478 } 3479 } 3480 } 3481 } 3482 3483 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3484 if (clinit != NULL) { 3485 CHECK(can_init_statics); 3486 JValue result; 3487 clinit->Invoke(self, NULL, 0, &result, "V"); 3488 } 3489 3490 uint64_t t1 = NanoTime(); 3491 3492 bool success = true; 3493 { 3494 ObjectLock<mirror::Class> lock(self, klass); 3495 3496 if (self->IsExceptionPending()) { 3497 WrapExceptionInInitializer(); 3498 klass->SetStatus(mirror::Class::kStatusError, self); 3499 success = false; 3500 } else { 3501 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3502 RuntimeStats* thread_stats = self->GetStats(); 3503 ++global_stats->class_init_count; 3504 ++thread_stats->class_init_count; 3505 global_stats->class_init_time_ns += (t1 - t0); 3506 thread_stats->class_init_time_ns += (t1 - t0); 3507 // Set the class as initialized except if failed to initialize static fields. 3508 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3509 if (VLOG_IS_ON(class_linker)) { 3510 LOG(INFO) << "Initialized class " << klass->GetDescriptor() << " from " << 3511 klass->GetLocation(); 3512 } 3513 // Opportunistically set static method trampolines to their destination. 3514 FixupStaticTrampolines(klass.Get()); 3515 } 3516 } 3517 return success; 3518} 3519 3520bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3521 ObjectLock<mirror::Class>& lock) 3522 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3523 while (true) { 3524 self->AssertNoPendingException(); 3525 CHECK(!klass->IsInitialized()); 3526 lock.WaitIgnoringInterrupts(); 3527 3528 // When we wake up, repeat the test for init-in-progress. If 3529 // there's an exception pending (only possible if 3530 // "interruptShouldThrow" was set), bail out. 3531 if (self->IsExceptionPending()) { 3532 WrapExceptionInInitializer(); 3533 klass->SetStatus(mirror::Class::kStatusError, self); 3534 return false; 3535 } 3536 // Spurious wakeup? Go back to waiting. 3537 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3538 continue; 3539 } 3540 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3541 // Compile time initialization failed. 3542 return false; 3543 } 3544 if (klass->IsErroneous()) { 3545 // The caller wants an exception, but it was thrown in a 3546 // different thread. Synthesize one here. 3547 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3548 PrettyDescriptor(klass.Get()).c_str()); 3549 return false; 3550 } 3551 if (klass->IsInitialized()) { 3552 return true; 3553 } 3554 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 3555 << klass->GetStatus(); 3556 } 3557 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 3558} 3559 3560bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 3561 if (klass->IsInterface()) { 3562 return true; 3563 } 3564 // Begin with the methods local to the superclass. 3565 StackHandleScope<2> hs(Thread::Current()); 3566 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3567 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3568 if (klass->HasSuperClass() && 3569 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3570 for (int i = klass->GetSuperClass()->GetVTable()->GetLength() - 1; i >= 0; --i) { 3571 mh.ChangeMethod(klass->GetVTable()->GetWithoutChecks(i)); 3572 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTable()->GetWithoutChecks(i)); 3573 if (mh.GetMethod() != super_mh.GetMethod() && 3574 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3575 ThrowLinkageError(klass.Get(), 3576 "Class %s method %s resolves differently in superclass %s", 3577 PrettyDescriptor(klass.Get()).c_str(), 3578 PrettyMethod(mh.GetMethod()).c_str(), 3579 PrettyDescriptor(klass->GetSuperClass()).c_str()); 3580 return false; 3581 } 3582 } 3583 } 3584 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3585 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 3586 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 3587 for (uint32_t j = 0; j < num_methods; ++j) { 3588 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 3589 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 3590 if (mh.GetMethod() != super_mh.GetMethod() && 3591 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3592 ThrowLinkageError(klass.Get(), 3593 "Class %s method %s resolves differently in interface %s", 3594 PrettyDescriptor(klass.Get()).c_str(), 3595 PrettyMethod(mh.GetMethod()).c_str(), 3596 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 3597 return false; 3598 } 3599 } 3600 } 3601 } 3602 return true; 3603} 3604 3605bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 3606 bool can_init_parents) { 3607 DCHECK(c.Get() != nullptr); 3608 const bool success = c->IsInitialized() || InitializeClass(c, can_init_fields, can_init_parents); 3609 if (!success && can_init_fields && can_init_parents) { 3610 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.Get()); 3611 } 3612 return success; 3613} 3614 3615void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3616 mirror::Class* c, 3617 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3618 const byte* class_data = dex_file.GetClassData(dex_class_def); 3619 ClassDataItemIterator it(dex_file, class_data); 3620 StackHandleScope<2> hs(Thread::Current()); 3621 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 3622 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 3623 CHECK(!kMovingFields); 3624 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3625 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3626 } 3627} 3628 3629void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 3630 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 3631 if (fields != nullptr) { 3632 for (int index = 0; index < fields->GetLength(); index ++) { 3633 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 3634 fields->Get(index)->SetDeclaringClass(new_class); 3635 } 3636 } 3637 } 3638 3639 fields = new_class->GetSFields(); 3640 if (fields != nullptr) { 3641 for (int index = 0; index < fields->GetLength(); index ++) { 3642 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 3643 fields->Get(index)->SetDeclaringClass(new_class); 3644 } 3645 } 3646 } 3647 3648 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 3649 if (methods != nullptr) { 3650 for (int index = 0; index < methods->GetLength(); index ++) { 3651 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 3652 methods->Get(index)->SetDeclaringClass(new_class); 3653 } 3654 } 3655 } 3656 3657 methods = new_class->GetVirtualMethods(); 3658 if (methods != nullptr) { 3659 for (int index = 0; index < methods->GetLength(); index ++) { 3660 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 3661 methods->Get(index)->SetDeclaringClass(new_class); 3662 } 3663 } 3664 } 3665} 3666 3667bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 3668 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 3669 mirror::Class** new_class) { 3670 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3671 3672 if (!LinkSuperClass(klass)) { 3673 return false; 3674 } 3675 if (!LinkMethods(self, klass, interfaces)) { 3676 return false; 3677 } 3678 if (!LinkInstanceFields(klass)) { 3679 return false; 3680 } 3681 size_t class_size; 3682 if (!LinkStaticFields(klass, &class_size)) { 3683 return false; 3684 } 3685 CreateReferenceInstanceOffsets(klass); 3686 CreateReferenceStaticOffsets(klass); 3687 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3688 3689 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 3690 // We don't need to retire this class as it has no embedded tables or it was created the 3691 // correct size during class linker initialization. 3692 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 3693 3694 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 3695 klass->PopulateEmbeddedImtAndVTable(); 3696 } 3697 3698 // This will notify waiters on klass that saw the not yet resolved 3699 // class in the class_table_ during EnsureResolved. 3700 klass->SetStatus(mirror::Class::kStatusResolved, self); 3701 *new_class = klass.Get(); 3702 } else { 3703 CHECK(!klass->IsResolved()); 3704 // Retire the temporary class and create the correctly sized resolved class. 3705 *new_class = klass->CopyOf(self, class_size); 3706 if (UNLIKELY(*new_class == NULL)) { 3707 CHECK(self->IsExceptionPending()); // Expect an OOME. 3708 klass->SetStatus(mirror::Class::kStatusError, self); 3709 return false; 3710 } 3711 3712 CHECK_EQ((*new_class)->GetClassSize(), class_size); 3713 StackHandleScope<1> hs(self); 3714 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 3715 ObjectLock<mirror::Class> lock(self, new_class_h); 3716 3717 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 3718 3719 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 3720 CHECK(existing == NULL || existing == klass.Get()); 3721 3722 // This will notify waiters on temp class that saw the not yet resolved class in the 3723 // class_table_ during EnsureResolved. 3724 klass->SetStatus(mirror::Class::kStatusRetired, self); 3725 3726 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 3727 // This will notify waiters on new_class that saw the not yet resolved 3728 // class in the class_table_ during EnsureResolved. 3729 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 3730 3731 // Only embedded imt should be used from this point. 3732 new_class_h->SetImTable(NULL); 3733 // TODO: remove vtable and only use embedded vtable. 3734 } 3735 return true; 3736} 3737 3738bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 3739 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3740 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3741 uint16_t super_class_idx = class_def.superclass_idx_; 3742 if (super_class_idx != DexFile::kDexNoIndex16) { 3743 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 3744 if (super_class == NULL) { 3745 DCHECK(Thread::Current()->IsExceptionPending()); 3746 return false; 3747 } 3748 // Verify 3749 if (!klass->CanAccess(super_class)) { 3750 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 3751 PrettyDescriptor(super_class).c_str(), 3752 PrettyDescriptor(klass.Get()).c_str()); 3753 return false; 3754 } 3755 CHECK(super_class->IsResolved()); 3756 klass->SetSuperClass(super_class); 3757 } 3758 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3759 if (interfaces != NULL) { 3760 for (size_t i = 0; i < interfaces->Size(); i++) { 3761 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3762 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 3763 if (interface == NULL) { 3764 DCHECK(Thread::Current()->IsExceptionPending()); 3765 return false; 3766 } 3767 // Verify 3768 if (!klass->CanAccess(interface)) { 3769 // TODO: the RI seemed to ignore this in my testing. 3770 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 3771 PrettyDescriptor(interface).c_str(), 3772 PrettyDescriptor(klass.Get()).c_str()); 3773 return false; 3774 } 3775 } 3776 } 3777 // Mark the class as loaded. 3778 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3779 return true; 3780} 3781 3782bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 3783 CHECK(!klass->IsPrimitive()); 3784 mirror::Class* super = klass->GetSuperClass(); 3785 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 3786 if (super != NULL) { 3787 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 3788 return false; 3789 } 3790 return true; 3791 } 3792 if (super == NULL) { 3793 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 3794 PrettyDescriptor(klass.Get()).c_str()); 3795 return false; 3796 } 3797 // Verify 3798 if (super->IsFinal() || super->IsInterface()) { 3799 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 3800 PrettyDescriptor(super).c_str(), 3801 PrettyDescriptor(klass.Get()).c_str(), 3802 super->IsFinal() ? "declared final" : "an interface"); 3803 return false; 3804 } 3805 if (!klass->CanAccess(super)) { 3806 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 3807 PrettyDescriptor(super).c_str(), 3808 PrettyDescriptor(klass.Get()).c_str()); 3809 return false; 3810 } 3811 3812 // Inherit kAccClassIsFinalizable from the superclass in case this 3813 // class doesn't override finalize. 3814 if (super->IsFinalizable()) { 3815 klass->SetFinalizable(); 3816 } 3817 3818 // Inherit reference flags (if any) from the superclass. 3819 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3820 if (reference_flags != 0) { 3821 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3822 } 3823 // Disallow custom direct subclasses of java.lang.ref.Reference. 3824 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3825 ThrowLinkageError(klass.Get(), 3826 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3827 PrettyDescriptor(klass.Get()).c_str()); 3828 return false; 3829 } 3830 3831 if (kIsDebugBuild) { 3832 // Ensure super classes are fully resolved prior to resolving fields.. 3833 while (super != NULL) { 3834 CHECK(super->IsResolved()); 3835 super = super->GetSuperClass(); 3836 } 3837 } 3838 return true; 3839} 3840 3841// Populate the class vtable and itable. Compute return type indices. 3842bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 3843 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3844 if (klass->IsInterface()) { 3845 // No vtable. 3846 size_t count = klass->NumVirtualMethods(); 3847 if (!IsUint(16, count)) { 3848 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 3849 return false; 3850 } 3851 for (size_t i = 0; i < count; ++i) { 3852 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3853 } 3854 // Link interface method tables 3855 return LinkInterfaceMethods(klass, interfaces); 3856 } else { 3857 // Link virtual and interface method tables 3858 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 3859 } 3860 return true; 3861} 3862 3863bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 3864 if (klass->HasSuperClass()) { 3865 uint32_t max_count = klass->NumVirtualMethods() + 3866 klass->GetSuperClass()->GetVTable()->GetLength(); 3867 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3868 CHECK_LE(actual_count, max_count); 3869 // TODO: do not assign to the vtable field until it is fully constructed. 3870 StackHandleScope<3> hs(self); 3871 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3872 hs.NewHandle(klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count))); 3873 if (UNLIKELY(vtable.Get() == NULL)) { 3874 CHECK(self->IsExceptionPending()); // OOME. 3875 return false; 3876 } 3877 // See if any of our virtual methods override the superclass. 3878 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3879 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3880 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3881 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3882 local_mh.ChangeMethod(local_method); 3883 size_t j = 0; 3884 for (; j < actual_count; ++j) { 3885 mirror::ArtMethod* super_method = vtable->Get(j); 3886 super_mh.ChangeMethod(super_method); 3887 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3888 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 3889 super_method->GetAccessFlags())) { 3890 if (super_method->IsFinal()) { 3891 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 3892 PrettyMethod(local_method).c_str(), 3893 super_method->GetDeclaringClassDescriptor()); 3894 return false; 3895 } 3896 vtable->Set<false>(j, local_method); 3897 local_method->SetMethodIndex(j); 3898 break; 3899 } else { 3900 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3901 << " would have incorrectly overridden the package-private method in " 3902 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 3903 } 3904 } 3905 } 3906 if (j == actual_count) { 3907 // Not overriding, append. 3908 vtable->Set<false>(actual_count, local_method); 3909 local_method->SetMethodIndex(actual_count); 3910 actual_count += 1; 3911 } 3912 } 3913 if (!IsUint(16, actual_count)) { 3914 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 3915 return false; 3916 } 3917 // Shrink vtable if possible 3918 CHECK_LE(actual_count, max_count); 3919 if (actual_count < max_count) { 3920 vtable.Assign(vtable->CopyOf(self, actual_count)); 3921 if (UNLIKELY(vtable.Get() == NULL)) { 3922 CHECK(self->IsExceptionPending()); // OOME. 3923 return false; 3924 } 3925 } 3926 klass->SetVTable(vtable.Get()); 3927 } else { 3928 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 3929 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3930 if (!IsUint(16, num_virtual_methods)) { 3931 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 3932 return false; 3933 } 3934 StackHandleScope<1> hs(self); 3935 Handle<mirror::ObjectArray<mirror::ArtMethod>> 3936 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 3937 if (UNLIKELY(vtable.Get() == NULL)) { 3938 CHECK(self->IsExceptionPending()); // OOME. 3939 return false; 3940 } 3941 for (size_t i = 0; i < num_virtual_methods; ++i) { 3942 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3943 vtable->Set<false>(i, virtual_method); 3944 virtual_method->SetMethodIndex(i & 0xFFFF); 3945 } 3946 klass->SetVTable(vtable.Get()); 3947 } 3948 return true; 3949} 3950 3951bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 3952 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3953 Thread* const self = Thread::Current(); 3954 Runtime* const runtime = Runtime::Current(); 3955 // Set the imt table to be all conflicts by default. 3956 klass->SetImTable(runtime->GetDefaultImt()); 3957 size_t super_ifcount; 3958 if (klass->HasSuperClass()) { 3959 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3960 } else { 3961 super_ifcount = 0; 3962 } 3963 uint32_t num_interfaces = 3964 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 3965 size_t ifcount = super_ifcount + num_interfaces; 3966 for (size_t i = 0; i < num_interfaces; i++) { 3967 mirror::Class* interface = 3968 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 3969 interfaces->Get(i); 3970 ifcount += interface->GetIfTableCount(); 3971 } 3972 if (ifcount == 0) { 3973 // Class implements no interfaces. 3974 DCHECK_EQ(klass->GetIfTableCount(), 0); 3975 DCHECK(klass->GetIfTable() == NULL); 3976 return true; 3977 } 3978 if (ifcount == super_ifcount) { 3979 // Class implements same interfaces as parent, are any of these not marker interfaces? 3980 bool has_non_marker_interface = false; 3981 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3982 for (size_t i = 0; i < ifcount; ++i) { 3983 if (super_iftable->GetMethodArrayCount(i) > 0) { 3984 has_non_marker_interface = true; 3985 break; 3986 } 3987 } 3988 if (!has_non_marker_interface) { 3989 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3990 klass->SetIfTable(super_iftable); 3991 return true; 3992 } 3993 } 3994 StackHandleScope<4> hs(self); 3995 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 3996 if (UNLIKELY(iftable.Get() == NULL)) { 3997 CHECK(self->IsExceptionPending()); // OOME. 3998 return false; 3999 } 4000 if (super_ifcount != 0) { 4001 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4002 for (size_t i = 0; i < super_ifcount; i++) { 4003 mirror::Class* super_interface = super_iftable->GetInterface(i); 4004 iftable->SetInterface(i, super_interface); 4005 } 4006 } 4007 // Flatten the interface inheritance hierarchy. 4008 size_t idx = super_ifcount; 4009 for (size_t i = 0; i < num_interfaces; i++) { 4010 mirror::Class* interface = 4011 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4012 interfaces->Get(i); 4013 DCHECK(interface != NULL); 4014 if (!interface->IsInterface()) { 4015 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4016 PrettyDescriptor(klass.Get()).c_str(), 4017 PrettyDescriptor(interface->GetDescriptor()).c_str()); 4018 return false; 4019 } 4020 // Check if interface is already in iftable 4021 bool duplicate = false; 4022 for (size_t j = 0; j < idx; j++) { 4023 mirror::Class* existing_interface = iftable->GetInterface(j); 4024 if (existing_interface == interface) { 4025 duplicate = true; 4026 break; 4027 } 4028 } 4029 if (!duplicate) { 4030 // Add this non-duplicate interface. 4031 iftable->SetInterface(idx++, interface); 4032 // Add this interface's non-duplicate super-interfaces. 4033 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4034 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4035 bool super_duplicate = false; 4036 for (size_t k = 0; k < idx; k++) { 4037 mirror::Class* existing_interface = iftable->GetInterface(k); 4038 if (existing_interface == super_interface) { 4039 super_duplicate = true; 4040 break; 4041 } 4042 } 4043 if (!super_duplicate) { 4044 iftable->SetInterface(idx++, super_interface); 4045 } 4046 } 4047 } 4048 } 4049 // Shrink iftable in case duplicates were found 4050 if (idx < ifcount) { 4051 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4052 if (UNLIKELY(iftable.Get() == NULL)) { 4053 CHECK(self->IsExceptionPending()); // OOME. 4054 return false; 4055 } 4056 ifcount = idx; 4057 } else { 4058 CHECK_EQ(idx, ifcount); 4059 } 4060 klass->SetIfTable(iftable.Get()); 4061 4062 // If we're an interface, we don't need the vtable pointers, so we're done. 4063 if (klass->IsInterface()) { 4064 return true; 4065 } 4066 // Allocate imtable 4067 bool imtable_changed = false; 4068 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4069 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4070 if (UNLIKELY(imtable.Get() == NULL)) { 4071 CHECK(self->IsExceptionPending()); // OOME. 4072 return false; 4073 } 4074 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4075 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4076 std::vector<mirror::ArtMethod*> miranda_list; 4077 for (size_t i = 0; i < ifcount; ++i) { 4078 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4079 if (num_methods > 0) { 4080 StackHandleScope<2> hs(self); 4081 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4082 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4083 if (UNLIKELY(method_array.Get() == nullptr)) { 4084 CHECK(self->IsExceptionPending()); // OOME. 4085 return false; 4086 } 4087 iftable->SetMethodArray(i, method_array.Get()); 4088 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4089 hs.NewHandle(klass->GetVTableDuringLinking())); 4090 for (size_t j = 0; j < num_methods; ++j) { 4091 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 4092 interface_mh.ChangeMethod(interface_method); 4093 int32_t k; 4094 // For each method listed in the interface's method list, find the 4095 // matching method in our class's method list. We want to favor the 4096 // subclass over the superclass, which just requires walking 4097 // back from the end of the vtable. (This only matters if the 4098 // superclass defines a private method and this class redefines 4099 // it -- otherwise it would use the same vtable slot. In .dex files 4100 // those don't end up in the virtual method table, so it shouldn't 4101 // matter which direction we go. We walk it backward anyway.) 4102 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4103 mirror::ArtMethod* vtable_method = vtable->Get(k); 4104 vtable_mh.ChangeMethod(vtable_method); 4105 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4106 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 4107 ThrowIllegalAccessError( 4108 klass.Get(), 4109 "Method '%s' implementing interface method '%s' is not public", 4110 PrettyMethod(vtable_method).c_str(), 4111 PrettyMethod(interface_method).c_str()); 4112 return false; 4113 } 4114 method_array->Set<false>(j, vtable_method); 4115 // Place method in imt if entry is empty, place conflict otherwise. 4116 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4117 if (imtable->Get(imt_index) == NULL) { 4118 imtable->Set<false>(imt_index, vtable_method); 4119 imtable_changed = true; 4120 } else { 4121 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4122 } 4123 break; 4124 } 4125 } 4126 if (k < 0) { 4127 StackHandleScope<1> hs(self); 4128 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4129 for (mirror::ArtMethod* mir_method : miranda_list) { 4130 vtable_mh.ChangeMethod(mir_method); 4131 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4132 miranda_method.Assign(mir_method); 4133 break; 4134 } 4135 } 4136 if (miranda_method.Get() == NULL) { 4137 // Point the interface table at a phantom slot. 4138 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 4139 if (UNLIKELY(miranda_method.Get() == NULL)) { 4140 CHECK(self->IsExceptionPending()); // OOME. 4141 return false; 4142 } 4143 // TODO: If a methods move then the miranda_list may hold stale references. 4144 miranda_list.push_back(miranda_method.Get()); 4145 } 4146 method_array->Set<false>(j, miranda_method.Get()); 4147 } 4148 } 4149 } 4150 } 4151 if (imtable_changed) { 4152 // Fill in empty entries in interface method table with conflict. 4153 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4154 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4155 if (imtable->Get(i) == NULL) { 4156 imtable->Set<false>(i, imt_conflict_method); 4157 } 4158 } 4159 klass->SetImTable(imtable.Get()); 4160 } 4161 if (!miranda_list.empty()) { 4162 int old_method_count = klass->NumVirtualMethods(); 4163 int new_method_count = old_method_count + miranda_list.size(); 4164 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4165 if (old_method_count == 0) { 4166 virtuals = AllocArtMethodArray(self, new_method_count); 4167 } else { 4168 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4169 } 4170 if (UNLIKELY(virtuals == NULL)) { 4171 CHECK(self->IsExceptionPending()); // OOME. 4172 return false; 4173 } 4174 klass->SetVirtualMethods(virtuals); 4175 4176 StackHandleScope<1> hs(self); 4177 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4178 hs.NewHandle(klass->GetVTableDuringLinking())); 4179 CHECK(vtable.Get() != NULL); 4180 int old_vtable_count = vtable->GetLength(); 4181 int new_vtable_count = old_vtable_count + miranda_list.size(); 4182 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4183 if (UNLIKELY(vtable.Get() == NULL)) { 4184 CHECK(self->IsExceptionPending()); // OOME. 4185 return false; 4186 } 4187 for (size_t i = 0; i < miranda_list.size(); ++i) { 4188 mirror::ArtMethod* method = miranda_list[i]; 4189 // Leave the declaring class alone as type indices are relative to it 4190 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4191 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4192 klass->SetVirtualMethod(old_method_count + i, method); 4193 vtable->Set<false>(old_vtable_count + i, method); 4194 } 4195 // TODO: do not assign to the vtable field until it is fully constructed. 4196 klass->SetVTable(vtable.Get()); 4197 } 4198 4199 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4200 for (int i = 0; i < vtable->GetLength(); ++i) { 4201 CHECK(vtable->Get(i) != NULL); 4202 } 4203 4204// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4205 4206 return true; 4207} 4208 4209bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4210 CHECK(klass.Get() != NULL); 4211 return LinkFields(klass, false, nullptr); 4212} 4213 4214bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass, size_t* class_size) { 4215 CHECK(klass.Get() != NULL); 4216 return LinkFields(klass, true, class_size); 4217} 4218 4219struct LinkFieldsComparator { 4220 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4221 } 4222 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4223 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4224 NO_THREAD_SAFETY_ANALYSIS { 4225 // First come reference fields, then 64-bit, and finally 32-bit 4226 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4227 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4228 if (type1 != type2) { 4229 bool is_primitive1 = type1 != Primitive::kPrimNot; 4230 bool is_primitive2 = type2 != Primitive::kPrimNot; 4231 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4232 type1 == Primitive::kPrimDouble); 4233 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4234 type2 == Primitive::kPrimDouble); 4235 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4236 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4237 if (order1 != order2) { 4238 return order1 < order2; 4239 } 4240 } 4241 // same basic group? then sort by string. 4242 return strcmp(field1->GetName(), field2->GetName()) < 0; 4243 } 4244}; 4245 4246bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static, size_t* class_size) { 4247 size_t num_fields = 4248 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4249 4250 mirror::ObjectArray<mirror::ArtField>* fields = 4251 is_static ? klass->GetSFields() : klass->GetIFields(); 4252 4253 // Initialize field_offset 4254 MemberOffset field_offset(0); 4255 if (is_static) { 4256 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 4257 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4258 // Static fields come after the embedded tables. 4259 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 4260 0, 0, 0); 4261 } 4262 field_offset = MemberOffset(base); 4263 } else { 4264 mirror::Class* super_class = klass->GetSuperClass(); 4265 if (super_class != NULL) { 4266 CHECK(super_class->IsResolved()) 4267 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4268 field_offset = MemberOffset(super_class->GetObjectSize()); 4269 } 4270 } 4271 4272 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4273 4274 // we want a relatively stable order so that adding new fields 4275 // minimizes disruption of C++ version such as Class and Method. 4276 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4277 for (size_t i = 0; i < num_fields; i++) { 4278 mirror::ArtField* f = fields->Get(i); 4279 CHECK(f != NULL) << PrettyClass(klass.Get()); 4280 grouped_and_sorted_fields.push_back(f); 4281 } 4282 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4283 LinkFieldsComparator()); 4284 4285 // References should be at the front. 4286 size_t current_field = 0; 4287 size_t num_reference_fields = 0; 4288 for (; current_field < num_fields; current_field++) { 4289 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4290 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4291 bool isPrimitive = type != Primitive::kPrimNot; 4292 if (isPrimitive) { 4293 break; // past last reference, move on to the next phase 4294 } 4295 grouped_and_sorted_fields.pop_front(); 4296 num_reference_fields++; 4297 fields->Set<false>(current_field, field); 4298 field->SetOffset(field_offset); 4299 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4300 } 4301 4302 // Now we want to pack all of the double-wide fields together. If 4303 // we're not aligned, though, we want to shuffle one 32-bit field 4304 // into place. If we can't find one, we'll have to pad it. 4305 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4306 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4307 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4308 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4309 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4310 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4311 continue; 4312 } 4313 fields->Set<false>(current_field++, field); 4314 field->SetOffset(field_offset); 4315 // drop the consumed field 4316 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4317 break; 4318 } 4319 // whether we found a 32-bit field for padding or not, we advance 4320 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4321 } 4322 4323 // Alignment is good, shuffle any double-wide fields forward, and 4324 // finish assigning field offsets to all fields. 4325 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 4326 << PrettyClass(klass.Get()); 4327 while (!grouped_and_sorted_fields.empty()) { 4328 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4329 grouped_and_sorted_fields.pop_front(); 4330 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4331 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4332 fields->Set<false>(current_field, field); 4333 field->SetOffset(field_offset); 4334 field_offset = MemberOffset(field_offset.Uint32Value() + 4335 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4336 ? sizeof(uint64_t) 4337 : sizeof(uint32_t))); 4338 current_field++; 4339 } 4340 4341 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4342 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4343 // We know there are no non-reference fields in the Reference classes, and we know 4344 // that 'referent' is alphabetically last, so this is easy... 4345 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4346 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4347 --num_reference_fields; 4348 } 4349 4350 if (kIsDebugBuild) { 4351 // Make sure that all reference fields appear before 4352 // non-reference fields, and all double-wide fields are aligned. 4353 bool seen_non_ref = false; 4354 for (size_t i = 0; i < num_fields; i++) { 4355 mirror::ArtField* field = fields->Get(i); 4356 if (false) { // enable to debug field layout 4357 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4358 << " class=" << PrettyClass(klass.Get()) 4359 << " field=" << PrettyField(field) 4360 << " offset=" 4361 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4362 } 4363 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4364 bool is_primitive = type != Primitive::kPrimNot; 4365 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4366 strcmp("referent", field->GetName()) == 0) { 4367 is_primitive = true; // We lied above, so we have to expect a lie here. 4368 } 4369 if (is_primitive) { 4370 if (!seen_non_ref) { 4371 seen_non_ref = true; 4372 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4373 } 4374 } else { 4375 DCHECK(!seen_non_ref) << PrettyField(field); 4376 } 4377 } 4378 if (!seen_non_ref) { 4379 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4380 } 4381 } 4382 4383 size_t size = field_offset.Uint32Value(); 4384 // Update klass 4385 if (is_static) { 4386 klass->SetNumReferenceStaticFields(num_reference_fields); 4387 *class_size = size; 4388 } else { 4389 klass->SetNumReferenceInstanceFields(num_reference_fields); 4390 if (!klass->IsVariableSize()) { 4391 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(); 4392 size_t previous_size = klass->GetObjectSize(); 4393 if (previous_size != 0) { 4394 // Make sure that we didn't originally have an incorrect size. 4395 CHECK_EQ(previous_size, size) << klass->GetDescriptor(); 4396 } 4397 klass->SetObjectSize(size); 4398 } 4399 } 4400 return true; 4401} 4402 4403// Set the bitmap of reference offsets, refOffsets, from the ifields 4404// list. 4405void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4406 uint32_t reference_offsets = 0; 4407 mirror::Class* super_class = klass->GetSuperClass(); 4408 if (super_class != NULL) { 4409 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4410 // If our superclass overflowed, we don't stand a chance. 4411 if (reference_offsets == CLASS_WALK_SUPER) { 4412 klass->SetReferenceInstanceOffsets(reference_offsets); 4413 return; 4414 } 4415 } 4416 CreateReferenceOffsets(klass, false, reference_offsets); 4417} 4418 4419void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4420 CreateReferenceOffsets(klass, true, 0); 4421} 4422 4423void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4424 uint32_t reference_offsets) { 4425 size_t num_reference_fields = 4426 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4427 : klass->NumReferenceInstanceFieldsDuringLinking(); 4428 mirror::ObjectArray<mirror::ArtField>* fields = 4429 is_static ? klass->GetSFields() : klass->GetIFields(); 4430 // All of the fields that contain object references are guaranteed 4431 // to be at the beginning of the fields list. 4432 for (size_t i = 0; i < num_reference_fields; ++i) { 4433 // Note that byte_offset is the offset from the beginning of 4434 // object, not the offset into instance data 4435 mirror::ArtField* field = fields->Get(i); 4436 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4437 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4438 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4439 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4440 CHECK_NE(new_bit, 0U); 4441 reference_offsets |= new_bit; 4442 } else { 4443 reference_offsets = CLASS_WALK_SUPER; 4444 break; 4445 } 4446 } 4447 // Update fields in klass 4448 if (is_static) { 4449 klass->SetReferenceStaticOffsets(reference_offsets); 4450 } else { 4451 klass->SetReferenceInstanceOffsets(reference_offsets); 4452 } 4453} 4454 4455mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4456 Handle<mirror::DexCache> dex_cache) { 4457 DCHECK(dex_cache.Get() != nullptr); 4458 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4459 if (resolved != NULL) { 4460 return resolved; 4461 } 4462 uint32_t utf16_length; 4463 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4464 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4465 dex_cache->SetResolvedString(string_idx, string); 4466 return string; 4467} 4468 4469mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4470 mirror::Class* referrer) { 4471 StackHandleScope<2> hs(Thread::Current()); 4472 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4473 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4474 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4475} 4476 4477mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4478 Handle<mirror::DexCache> dex_cache, 4479 Handle<mirror::ClassLoader> class_loader) { 4480 DCHECK(dex_cache.Get() != NULL); 4481 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4482 if (resolved == NULL) { 4483 Thread* self = Thread::Current(); 4484 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4485 resolved = FindClass(self, descriptor, class_loader); 4486 if (resolved != NULL) { 4487 // TODO: we used to throw here if resolved's class loader was not the 4488 // boot class loader. This was to permit different classes with the 4489 // same name to be loaded simultaneously by different loaders 4490 dex_cache->SetResolvedType(type_idx, resolved); 4491 } else { 4492 CHECK(self->IsExceptionPending()) 4493 << "Expected pending exception for failed resolution of: " << descriptor; 4494 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4495 StackHandleScope<1> hs(self); 4496 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4497 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4498 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4499 self->ClearException(); 4500 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4501 self->GetException(NULL)->SetCause(cause.Get()); 4502 } 4503 } 4504 } 4505 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4506 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4507 return resolved; 4508} 4509 4510mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 4511 Handle<mirror::DexCache> dex_cache, 4512 Handle<mirror::ClassLoader> class_loader, 4513 Handle<mirror::ArtMethod> referrer, 4514 InvokeType type) { 4515 DCHECK(dex_cache.Get() != NULL); 4516 // Check for hit in the dex cache. 4517 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4518 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 4519 return resolved; 4520 } 4521 // Fail, get the declaring class. 4522 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4523 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4524 if (klass == NULL) { 4525 DCHECK(Thread::Current()->IsExceptionPending()); 4526 return NULL; 4527 } 4528 // Scan using method_idx, this saves string compares but will only hit for matching dex 4529 // caches/files. 4530 switch (type) { 4531 case kDirect: // Fall-through. 4532 case kStatic: 4533 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 4534 break; 4535 case kInterface: 4536 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 4537 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4538 break; 4539 case kSuper: // Fall-through. 4540 case kVirtual: 4541 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 4542 break; 4543 default: 4544 LOG(FATAL) << "Unreachable - invocation type: " << type; 4545 } 4546 if (resolved == NULL) { 4547 // Search by name, which works across dex files. 4548 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4549 const Signature signature = dex_file.GetMethodSignature(method_id); 4550 switch (type) { 4551 case kDirect: // Fall-through. 4552 case kStatic: 4553 resolved = klass->FindDirectMethod(name, signature); 4554 break; 4555 case kInterface: 4556 resolved = klass->FindInterfaceMethod(name, signature); 4557 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4558 break; 4559 case kSuper: // Fall-through. 4560 case kVirtual: 4561 resolved = klass->FindVirtualMethod(name, signature); 4562 break; 4563 } 4564 } 4565 if (resolved != NULL) { 4566 // We found a method, check for incompatible class changes. 4567 if (resolved->CheckIncompatibleClassChange(type)) { 4568 resolved = NULL; 4569 } 4570 } 4571 if (resolved != NULL) { 4572 // Be a good citizen and update the dex cache to speed subsequent calls. 4573 dex_cache->SetResolvedMethod(method_idx, resolved); 4574 return resolved; 4575 } else { 4576 // We failed to find the method which means either an access error, an incompatible class 4577 // change, or no such method. First try to find the method among direct and virtual methods. 4578 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4579 const Signature signature = dex_file.GetMethodSignature(method_id); 4580 switch (type) { 4581 case kDirect: 4582 case kStatic: 4583 resolved = klass->FindVirtualMethod(name, signature); 4584 break; 4585 case kInterface: 4586 case kVirtual: 4587 case kSuper: 4588 resolved = klass->FindDirectMethod(name, signature); 4589 break; 4590 } 4591 4592 // If we found something, check that it can be accessed by the referrer. 4593 if (resolved != NULL && referrer.Get() != NULL) { 4594 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4595 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4596 if (!referring_class->CanAccess(methods_class)) { 4597 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4598 resolved, type); 4599 return NULL; 4600 } else if (!referring_class->CanAccessMember(methods_class, 4601 resolved->GetAccessFlags())) { 4602 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4603 return NULL; 4604 } 4605 } 4606 4607 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4608 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4609 switch (type) { 4610 case kDirect: 4611 case kStatic: 4612 if (resolved != NULL) { 4613 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4614 } else { 4615 resolved = klass->FindInterfaceMethod(name, signature); 4616 if (resolved != NULL) { 4617 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4618 } else { 4619 ThrowNoSuchMethodError(type, klass, name, signature); 4620 } 4621 } 4622 break; 4623 case kInterface: 4624 if (resolved != NULL) { 4625 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4626 } else { 4627 resolved = klass->FindVirtualMethod(name, signature); 4628 if (resolved != NULL) { 4629 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4630 } else { 4631 ThrowNoSuchMethodError(type, klass, name, signature); 4632 } 4633 } 4634 break; 4635 case kSuper: 4636 ThrowNoSuchMethodError(type, klass, name, signature); 4637 break; 4638 case kVirtual: 4639 if (resolved != NULL) { 4640 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4641 } else { 4642 resolved = klass->FindInterfaceMethod(name, signature); 4643 if (resolved != NULL) { 4644 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4645 } else { 4646 ThrowNoSuchMethodError(type, klass, name, signature); 4647 } 4648 } 4649 break; 4650 } 4651 DCHECK(Thread::Current()->IsExceptionPending()); 4652 return NULL; 4653 } 4654} 4655 4656mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4657 Handle<mirror::DexCache> dex_cache, 4658 Handle<mirror::ClassLoader> class_loader, 4659 bool is_static) { 4660 DCHECK(dex_cache.Get() != nullptr); 4661 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4662 if (resolved != NULL) { 4663 return resolved; 4664 } 4665 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4666 Thread* const self = Thread::Current(); 4667 StackHandleScope<1> hs(self); 4668 Handle<mirror::Class> klass( 4669 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4670 if (klass.Get() == NULL) { 4671 DCHECK(Thread::Current()->IsExceptionPending()); 4672 return NULL; 4673 } 4674 4675 if (is_static) { 4676 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 4677 } else { 4678 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 4679 } 4680 4681 if (resolved == NULL) { 4682 const char* name = dex_file.GetFieldName(field_id); 4683 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4684 if (is_static) { 4685 resolved = mirror::Class::FindStaticField(self, klass, name, type); 4686 } else { 4687 resolved = klass->FindInstanceField(name, type); 4688 } 4689 if (resolved == NULL) { 4690 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 4691 return NULL; 4692 } 4693 } 4694 dex_cache->SetResolvedField(field_idx, resolved); 4695 return resolved; 4696} 4697 4698mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4699 uint32_t field_idx, 4700 Handle<mirror::DexCache> dex_cache, 4701 Handle<mirror::ClassLoader> class_loader) { 4702 DCHECK(dex_cache.Get() != nullptr); 4703 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4704 if (resolved != NULL) { 4705 return resolved; 4706 } 4707 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4708 Thread* self = Thread::Current(); 4709 StackHandleScope<1> hs(self); 4710 Handle<mirror::Class> klass( 4711 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4712 if (klass.Get() == NULL) { 4713 DCHECK(Thread::Current()->IsExceptionPending()); 4714 return NULL; 4715 } 4716 4717 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4718 StringPiece type(dex_file.StringDataByIdx( 4719 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4720 resolved = mirror::Class::FindField(self, klass, name, type); 4721 if (resolved != NULL) { 4722 dex_cache->SetResolvedField(field_idx, resolved); 4723 } else { 4724 ThrowNoSuchFieldError("", klass.Get(), type, name); 4725 } 4726 return resolved; 4727} 4728 4729const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4730 uint32_t* length) { 4731 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4732 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4733 const DexFile& dex_file = *dex_cache->GetDexFile(); 4734 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4735 return dex_file.GetMethodShorty(method_id, length); 4736} 4737 4738void ClassLinker::DumpAllClasses(int flags) { 4739 if (dex_cache_image_class_lookup_required_) { 4740 MoveImageClassesToClassTable(); 4741 } 4742 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4743 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4744 std::vector<mirror::Class*> all_classes; 4745 { 4746 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4747 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 4748 mirror::Class** root = &it.second; 4749 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 4750 all_classes.push_back(klass); 4751 } 4752 } 4753 4754 for (size_t i = 0; i < all_classes.size(); ++i) { 4755 all_classes[i]->DumpClass(std::cerr, flags); 4756 } 4757} 4758 4759void ClassLinker::DumpForSigQuit(std::ostream& os) { 4760 if (dex_cache_image_class_lookup_required_) { 4761 MoveImageClassesToClassTable(); 4762 } 4763 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4764 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4765} 4766 4767size_t ClassLinker::NumLoadedClasses() { 4768 if (dex_cache_image_class_lookup_required_) { 4769 MoveImageClassesToClassTable(); 4770 } 4771 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4772 return class_table_.size(); 4773} 4774 4775pid_t ClassLinker::GetClassesLockOwner() { 4776 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4777} 4778 4779pid_t ClassLinker::GetDexLockOwner() { 4780 return dex_lock_.GetExclusiveOwnerTid(); 4781} 4782 4783void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4784 DCHECK(!init_done_); 4785 4786 DCHECK(klass != NULL); 4787 DCHECK(klass->GetClassLoader() == NULL); 4788 4789 mirror::ObjectArray<mirror::Class>* class_roots = 4790 ReadBarrier::BarrierForRoot<mirror::ObjectArray<mirror::Class>, kWithReadBarrier>( 4791 &class_roots_); 4792 DCHECK(class_roots != NULL); 4793 DCHECK(class_roots->Get(class_root) == NULL); 4794 class_roots->Set<false>(class_root, klass); 4795} 4796 4797} // namespace art 4798