class_linker.cc revision ee5618be0076ac359ab59af1c2ba945d85b2986e
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <deque> 20#include <memory> 21#include <string> 22#include <utility> 23#include <vector> 24 25#include "base/casts.h" 26#include "base/logging.h" 27#include "base/scoped_flock.h" 28#include "base/stl_util.h" 29#include "base/unix_file/fd_file.h" 30#include "class_linker-inl.h" 31#include "compiler_callbacks.h" 32#include "debugger.h" 33#include "dex_file-inl.h" 34#include "gc_root-inl.h" 35#include "gc/accounting/card_table-inl.h" 36#include "gc/accounting/heap_bitmap.h" 37#include "gc/heap.h" 38#include "gc/space/image_space.h" 39#include "handle_scope.h" 40#include "intern_table.h" 41#include "interpreter/interpreter.h" 42#include "leb128.h" 43#include "method_helper-inl.h" 44#include "oat.h" 45#include "oat_file.h" 46#include "object_lock.h" 47#include "mirror/art_field-inl.h" 48#include "mirror/art_method-inl.h" 49#include "mirror/class.h" 50#include "mirror/class-inl.h" 51#include "mirror/class_loader.h" 52#include "mirror/dex_cache-inl.h" 53#include "mirror/iftable-inl.h" 54#include "mirror/object-inl.h" 55#include "mirror/object_array-inl.h" 56#include "mirror/proxy.h" 57#include "mirror/reference-inl.h" 58#include "mirror/stack_trace_element.h" 59#include "mirror/string-inl.h" 60#include "os.h" 61#include "runtime.h" 62#include "entrypoints/entrypoint_utils.h" 63#include "ScopedLocalRef.h" 64#include "scoped_thread_state_change.h" 65#include "handle_scope-inl.h" 66#include "thread.h" 67#include "utils.h" 68#include "verifier/method_verifier.h" 69#include "well_known_classes.h" 70 71namespace art { 72 73static void ThrowNoClassDefFoundError(const char* fmt, ...) 74 __attribute__((__format__(__printf__, 1, 2))) 75 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 76static void ThrowNoClassDefFoundError(const char* fmt, ...) { 77 va_list args; 78 va_start(args, fmt); 79 Thread* self = Thread::Current(); 80 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 81 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 82 va_end(args); 83} 84 85static void ThrowEarlierClassFailure(mirror::Class* c) 86 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 87 // The class failed to initialize on a previous attempt, so we want to throw 88 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 89 // failed in verification, in which case v2 5.4.1 says we need to re-throw 90 // the previous error. 91 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 92 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 93 } 94 95 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 96 Thread* self = Thread::Current(); 97 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 98 if (c->GetVerifyErrorClass() != NULL) { 99 // TODO: change the verifier to store an _instance_, with a useful detail message? 100 std::string temp; 101 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor(&temp), 102 PrettyDescriptor(c).c_str()); 103 } else { 104 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 105 PrettyDescriptor(c).c_str()); 106 } 107} 108 109static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 110 Thread* self = Thread::Current(); 111 JNIEnv* env = self->GetJniEnv(); 112 113 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 114 CHECK(cause.get() != NULL); 115 116 env->ExceptionClear(); 117 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 118 env->Throw(cause.get()); 119 120 // We only wrap non-Error exceptions; an Error can just be used as-is. 121 if (!is_error) { 122 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 123 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 124 } 125} 126 127static size_t Hash(const char* s) { 128 // This is the java.lang.String hashcode for convenience, not interoperability. 129 size_t hash = 0; 130 for (; *s != '\0'; ++s) { 131 hash = hash * 31 + *s; 132 } 133 return hash; 134} 135 136const char* ClassLinker::class_roots_descriptors_[] = { 137 "Ljava/lang/Class;", 138 "Ljava/lang/Object;", 139 "[Ljava/lang/Class;", 140 "[Ljava/lang/Object;", 141 "Ljava/lang/String;", 142 "Ljava/lang/DexCache;", 143 "Ljava/lang/ref/Reference;", 144 "Ljava/lang/reflect/ArtField;", 145 "Ljava/lang/reflect/ArtMethod;", 146 "Ljava/lang/reflect/Proxy;", 147 "[Ljava/lang/String;", 148 "[Ljava/lang/reflect/ArtField;", 149 "[Ljava/lang/reflect/ArtMethod;", 150 "Ljava/lang/ClassLoader;", 151 "Ljava/lang/Throwable;", 152 "Ljava/lang/ClassNotFoundException;", 153 "Ljava/lang/StackTraceElement;", 154 "Z", 155 "B", 156 "C", 157 "D", 158 "F", 159 "I", 160 "J", 161 "S", 162 "V", 163 "[Z", 164 "[B", 165 "[C", 166 "[D", 167 "[F", 168 "[I", 169 "[J", 170 "[S", 171 "[Ljava/lang/StackTraceElement;", 172}; 173 174ClassLinker::ClassLinker(InternTable* intern_table) 175 // dex_lock_ is recursive as it may be used in stack dumping. 176 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 177 dex_cache_image_class_lookup_required_(false), 178 failed_dex_cache_class_lookups_(0), 179 class_roots_(nullptr), 180 array_iftable_(nullptr), 181 find_array_class_cache_next_victim_(0), 182 init_done_(false), 183 log_new_dex_caches_roots_(false), 184 log_new_class_table_roots_(false), 185 intern_table_(intern_table), 186 portable_resolution_trampoline_(nullptr), 187 quick_resolution_trampoline_(nullptr), 188 portable_imt_conflict_trampoline_(nullptr), 189 quick_imt_conflict_trampoline_(nullptr), 190 quick_generic_jni_trampoline_(nullptr), 191 quick_to_interpreter_bridge_trampoline_(nullptr) { 192 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 193 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 194} 195 196// To set a value for generic JNI. May be necessary in compiler tests. 197extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 198 199void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 200 VLOG(startup) << "ClassLinker::Init"; 201 CHECK(Runtime::Current()->IsCompiler()); 202 203 CHECK(!init_done_); 204 205 // java_lang_Class comes first, it's needed for AllocClass 206 Thread* self = Thread::Current(); 207 gc::Heap* heap = Runtime::Current()->GetHeap(); 208 // The GC can't handle an object with a null class since we can't get the size of this object. 209 heap->IncrementDisableMovingGC(self); 210 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 211 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 212 heap->AllocNonMovableObject<true>(self, nullptr, 213 mirror::Class::ClassClassSize(), 214 VoidFunctor())))); 215 CHECK(java_lang_Class.Get() != NULL); 216 mirror::Class::SetClassClass(java_lang_Class.Get()); 217 java_lang_Class->SetClass(java_lang_Class.Get()); 218 if (kUseBakerOrBrooksReadBarrier) { 219 java_lang_Class->AssertReadBarrierPointer(); 220 } 221 java_lang_Class->SetClassSize(mirror::Class::ClassClassSize()); 222 heap->DecrementDisableMovingGC(self); 223 // AllocClass(mirror::Class*) can now be used 224 225 // Class[] is used for reflection support. 226 Handle<mirror::Class> class_array_class(hs.NewHandle( 227 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Class>::ClassSize()))); 228 class_array_class->SetComponentType(java_lang_Class.Get()); 229 230 // java_lang_Object comes next so that object_array_class can be created. 231 Handle<mirror::Class> java_lang_Object(hs.NewHandle( 232 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize()))); 233 CHECK(java_lang_Object.Get() != NULL); 234 // backfill Object as the super class of Class. 235 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 236 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 237 238 // Object[] next to hold class roots. 239 Handle<mirror::Class> object_array_class(hs.NewHandle( 240 AllocClass(self, java_lang_Class.Get(), mirror::ObjectArray<mirror::Object>::ClassSize()))); 241 object_array_class->SetComponentType(java_lang_Object.Get()); 242 243 // Setup the char (primitive) class to be used for char[]. 244 Handle<mirror::Class> char_class(hs.NewHandle( 245 AllocClass(self, java_lang_Class.Get(), mirror::Class::PrimitiveClassSize()))); 246 247 // Setup the char[] class to be used for String. 248 Handle<mirror::Class> char_array_class(hs.NewHandle( 249 AllocClass(self, java_lang_Class.Get(), 250 mirror::Array::ClassSize()))); 251 char_array_class->SetComponentType(char_class.Get()); 252 mirror::CharArray::SetArrayClass(char_array_class.Get()); 253 254 // Setup String. 255 Handle<mirror::Class> java_lang_String(hs.NewHandle( 256 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize()))); 257 mirror::String::SetClass(java_lang_String.Get()); 258 java_lang_String->SetObjectSize(mirror::String::InstanceSize()); 259 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 260 261 // Setup Reference. 262 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle( 263 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize()))); 264 mirror::Reference::SetClass(java_lang_ref_Reference.Get()); 265 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize()); 266 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusResolved, self); 267 268 // Create storage for root classes, save away our work so far (requires descriptors). 269 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class> >( 270 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 271 kClassRootsMax)); 272 CHECK(!class_roots_.IsNull()); 273 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 274 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 275 SetClassRoot(kClassArrayClass, class_array_class.Get()); 276 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 277 SetClassRoot(kCharArrayClass, char_array_class.Get()); 278 SetClassRoot(kJavaLangString, java_lang_String.Get()); 279 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get()); 280 281 // Setup the primitive type classes. 282 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 283 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 284 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 285 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 286 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 287 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 288 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 289 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 290 291 // Create array interface entries to populate once we can load system classes. 292 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2)); 293 294 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 295 Handle<mirror::Class> int_array_class(hs.NewHandle( 296 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize()))); 297 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 298 mirror::IntArray::SetArrayClass(int_array_class.Get()); 299 SetClassRoot(kIntArrayClass, int_array_class.Get()); 300 301 // now that these are registered, we can use AllocClass() and AllocObjectArray 302 303 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 304 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle( 305 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize()))); 306 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 307 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize()); 308 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 309 310 // Constructor, Field, Method, and AbstractMethod are necessary so 311 // that FindClass can link members. 312 Handle<mirror::Class> java_lang_reflect_ArtField(hs.NewHandle( 313 AllocClass(self, java_lang_Class.Get(), mirror::ArtField::ClassSize()))); 314 CHECK(java_lang_reflect_ArtField.Get() != NULL); 315 java_lang_reflect_ArtField->SetObjectSize(mirror::ArtField::InstanceSize()); 316 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 317 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 318 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 319 320 Handle<mirror::Class> java_lang_reflect_ArtMethod(hs.NewHandle( 321 AllocClass(self, java_lang_Class.Get(), mirror::ArtMethod::ClassSize()))); 322 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 323 java_lang_reflect_ArtMethod->SetObjectSize(mirror::ArtMethod::InstanceSize()); 324 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 325 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 326 327 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 328 329 // Set up array classes for string, field, method 330 Handle<mirror::Class> object_array_string(hs.NewHandle( 331 AllocClass(self, java_lang_Class.Get(), 332 mirror::ObjectArray<mirror::String>::ClassSize()))); 333 object_array_string->SetComponentType(java_lang_String.Get()); 334 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 335 336 Handle<mirror::Class> object_array_art_method(hs.NewHandle( 337 AllocClass(self, java_lang_Class.Get(), 338 mirror::ObjectArray<mirror::ArtMethod>::ClassSize()))); 339 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 340 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 341 342 Handle<mirror::Class> object_array_art_field(hs.NewHandle( 343 AllocClass(self, java_lang_Class.Get(), 344 mirror::ObjectArray<mirror::ArtField>::ClassSize()))); 345 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 346 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 347 348 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 349 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 350 // these roots. 351 CHECK_NE(0U, boot_class_path.size()); 352 for (size_t i = 0; i != boot_class_path.size(); ++i) { 353 const DexFile* dex_file = boot_class_path[i]; 354 CHECK(dex_file != NULL); 355 AppendToBootClassPath(*dex_file); 356 } 357 358 // now we can use FindSystemClass 359 360 // run char class through InitializePrimitiveClass to finish init 361 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 362 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 363 364 // Create runtime resolution and imt conflict methods. Also setup the default imt. 365 Runtime* runtime = Runtime::Current(); 366 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 367 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 368 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 369 370 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 371 // we do not need friend classes or a publicly exposed setter. 372 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 373 374 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 375 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 376 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 377 CHECK_EQ(java_lang_Object.Get(), Object_class); 378 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize()); 379 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 380 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 381 std::ostringstream os1, os2; 382 java_lang_String->DumpClass(os1, mirror::Class::kDumpClassFullDetail); 383 String_class->DumpClass(os2, mirror::Class::kDumpClassFullDetail); 384 CHECK_EQ(java_lang_String.Get(), String_class) << os1.str() << "\n\n" << os2.str(); 385 CHECK_EQ(java_lang_String->GetObjectSize(), mirror::String::InstanceSize()); 386 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 387 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 388 CHECK_EQ(java_lang_String.Get(), String_class); 389 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 390 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize()); 391 392 // Setup the primitive array type classes - can't be done until Object has a vtable. 393 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 394 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 395 396 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 397 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 398 399 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 400 CHECK_EQ(char_array_class.Get(), found_char_array_class); 401 402 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 403 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 404 405 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 406 CHECK_EQ(int_array_class.Get(), found_int_array_class); 407 408 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 409 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 410 411 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 412 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 413 414 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 415 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 416 417 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 418 CHECK_EQ(class_array_class.Get(), found_class_array_class); 419 420 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 421 CHECK_EQ(object_array_class.Get(), found_object_array_class); 422 423 // Setup the single, global copy of "iftable". 424 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 425 CHECK(java_lang_Cloneable != NULL); 426 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 427 CHECK(java_io_Serializable != NULL); 428 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 429 // crawl up and explicitly list all of the supers as well. 430 { 431 mirror::IfTable* array_iftable = array_iftable_.Read(); 432 array_iftable->SetInterface(0, java_lang_Cloneable); 433 array_iftable->SetInterface(1, java_io_Serializable); 434 } 435 436 // Sanity check Class[] and Object[]'s interfaces. 437 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 438 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 439 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 440 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 441 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 442 // dex_cache_ fields and register them in class_table_. 443 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 444 CHECK_EQ(java_lang_Class.Get(), Class_class); 445 446 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 447 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 448 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 449 450 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 451 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 452 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 453 454 mirror::Class* String_array_class = 455 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 456 CHECK_EQ(object_array_string.Get(), String_array_class); 457 458 mirror::Class* Art_method_array_class = 459 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 460 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 461 462 mirror::Class* Art_field_array_class = 463 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 464 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 465 466 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 467 468 // Create java.lang.reflect.Proxy root. 469 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 470 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 471 472 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 473 // finish initializing Reference class 474 java_lang_ref_Reference->SetStatus(mirror::Class::kStatusNotReady, self); 475 mirror::Class* Reference_class = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 476 CHECK_EQ(java_lang_ref_Reference.Get(), Reference_class); 477 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize()); 478 CHECK_EQ(java_lang_ref_Reference->GetClassSize(), mirror::Reference::ClassSize()); 479 mirror::Class* java_lang_ref_FinalizerReference = 480 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 481 java_lang_ref_FinalizerReference->SetAccessFlags( 482 java_lang_ref_FinalizerReference->GetAccessFlags() | 483 kAccClassIsReference | kAccClassIsFinalizerReference); 484 mirror::Class* java_lang_ref_PhantomReference = 485 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 486 java_lang_ref_PhantomReference->SetAccessFlags( 487 java_lang_ref_PhantomReference->GetAccessFlags() | 488 kAccClassIsReference | kAccClassIsPhantomReference); 489 mirror::Class* java_lang_ref_SoftReference = 490 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 491 java_lang_ref_SoftReference->SetAccessFlags( 492 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 493 mirror::Class* java_lang_ref_WeakReference = 494 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 495 java_lang_ref_WeakReference->SetAccessFlags( 496 java_lang_ref_WeakReference->GetAccessFlags() | 497 kAccClassIsReference | kAccClassIsWeakReference); 498 499 // Setup the ClassLoader, verifying the object_size_. 500 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 501 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), mirror::ClassLoader::InstanceSize()); 502 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 503 504 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 505 // java.lang.StackTraceElement as a convenience. 506 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 507 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 508 SetClassRoot(kJavaLangClassNotFoundException, 509 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 510 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 511 SetClassRoot(kJavaLangStackTraceElementArrayClass, 512 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 513 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 514 515 FinishInit(self); 516 517 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 518} 519 520void ClassLinker::FinishInit(Thread* self) { 521 VLOG(startup) << "ClassLinker::FinishInit entering"; 522 523 // Let the heap know some key offsets into java.lang.ref instances 524 // Note: we hard code the field indexes here rather than using FindInstanceField 525 // as the types of the field can't be resolved prior to the runtime being 526 // fully initialized 527 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 528 mirror::Class* java_lang_ref_FinalizerReference = 529 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 530 531 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 532 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 533 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 534 535 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 536 CHECK_STREQ(queue->GetName(), "queue"); 537 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 538 539 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 540 CHECK_STREQ(queueNext->GetName(), "queueNext"); 541 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 542 543 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 544 CHECK_STREQ(referent->GetName(), "referent"); 545 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 546 547 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 548 CHECK_STREQ(zombie->GetName(), "zombie"); 549 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 550 551 // ensure all class_roots_ are initialized 552 for (size_t i = 0; i < kClassRootsMax; i++) { 553 ClassRoot class_root = static_cast<ClassRoot>(i); 554 mirror::Class* klass = GetClassRoot(class_root); 555 CHECK(klass != NULL); 556 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 557 // note SetClassRoot does additional validation. 558 // if possible add new checks there to catch errors early 559 } 560 561 CHECK(!array_iftable_.IsNull()); 562 563 // disable the slow paths in FindClass and CreatePrimitiveClass now 564 // that Object, Class, and Object[] are setup 565 init_done_ = true; 566 567 VLOG(startup) << "ClassLinker::FinishInit exiting"; 568} 569 570void ClassLinker::RunRootClinits() { 571 Thread* self = Thread::Current(); 572 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 573 mirror::Class* c = GetClassRoot(ClassRoot(i)); 574 if (!c->IsArrayClass() && !c->IsPrimitive()) { 575 StackHandleScope<1> hs(self); 576 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 577 EnsureInitialized(h_class, true, true); 578 self->AssertNoPendingException(); 579 } 580 } 581} 582 583bool ClassLinker::GenerateOatFile(const char* dex_filename, 584 int oat_fd, 585 const char* oat_cache_filename, 586 std::string* error_msg) { 587 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 588 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 589 590 gc::Heap* heap = Runtime::Current()->GetHeap(); 591 std::string boot_image_option("--boot-image="); 592 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 593 594 std::string dex_file_option("--dex-file="); 595 dex_file_option += dex_filename; 596 597 std::string oat_fd_option("--oat-fd="); 598 StringAppendF(&oat_fd_option, "%d", oat_fd); 599 600 std::string oat_location_option("--oat-location="); 601 oat_location_option += oat_cache_filename; 602 603 std::vector<std::string> argv; 604 argv.push_back(dex2oat); 605 argv.push_back("--runtime-arg"); 606 argv.push_back("-classpath"); 607 argv.push_back("--runtime-arg"); 608 argv.push_back(Runtime::Current()->GetClassPathString()); 609 610 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 611 612 if (!Runtime::Current()->IsVerificationEnabled()) { 613 argv.push_back("--compiler-filter=verify-none"); 614 } 615 616 if (Runtime::Current()->MustRelocateIfPossible()) { 617 argv.push_back("--runtime-arg"); 618 argv.push_back("-Xrelocate"); 619 } else { 620 argv.push_back("--runtime-arg"); 621 argv.push_back("-Xnorelocate"); 622 } 623 624 if (!kIsTargetBuild) { 625 argv.push_back("--host"); 626 } 627 628 argv.push_back(boot_image_option); 629 argv.push_back(dex_file_option); 630 argv.push_back(oat_fd_option); 631 argv.push_back(oat_location_option); 632 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 633 for (size_t i = 0; i < compiler_options.size(); ++i) { 634 argv.push_back(compiler_options[i].c_str()); 635 } 636 637 return Exec(argv, error_msg); 638} 639 640const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 641 WriterMutexLock mu(Thread::Current(), dex_lock_); 642 if (kIsDebugBuild) { 643 for (size_t i = 0; i < oat_files_.size(); ++i) { 644 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 645 } 646 } 647 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 648 oat_files_.push_back(oat_file); 649 return oat_file; 650} 651 652OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 653 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 654 OatFile* oat_file = space->ReleaseOatFile(); 655 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 656 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 657 return *oat_file; 658} 659 660const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 661 const char* dex_location = dex_file.GetLocation().c_str(); 662 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 663 return FindOpenedOatFile(nullptr, dex_location, &dex_location_checksum); 664} 665 666const OatFile* ClassLinker::FindOpenedOatFile(const char* oat_location, const char* dex_location, 667 const uint32_t* const dex_location_checksum) { 668 ReaderMutexLock mu(Thread::Current(), dex_lock_); 669 for (size_t i = 0; i < oat_files_.size(); i++) { 670 const OatFile* oat_file = oat_files_[i]; 671 DCHECK(oat_file != NULL); 672 673 if (oat_location != nullptr) { 674 if (oat_file->GetLocation() != oat_location) { 675 continue; 676 } 677 } 678 679 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 680 dex_location_checksum, 681 false); 682 if (oat_dex_file != NULL) { 683 return oat_file; 684 } 685 } 686 return NULL; 687} 688 689static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, const char* dex_location, 690 bool generated, 691 std::vector<std::string>* error_msgs, 692 std::vector<const DexFile*>* dex_files) { 693 if (oat_file == nullptr) { 694 return false; 695 } 696 697 size_t old_size = dex_files->size(); // To rollback on error. 698 699 bool success = true; 700 for (size_t i = 0; success; ++i) { 701 std::string next_name_str = DexFile::GetMultiDexClassesDexName(i, dex_location); 702 const char* next_name = next_name_str.c_str(); 703 704 uint32_t dex_location_checksum; 705 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 706 std::string error_msg; 707 if (!DexFile::GetChecksum(next_name, dex_location_checksum_pointer, &error_msg)) { 708 DCHECK_EQ(false, i == 0 && generated); 709 dex_location_checksum_pointer = nullptr; 710 } 711 712 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 713 714 if (oat_dex_file == nullptr) { 715 if (i == 0 && generated) { 716 std::string error_msg; 717 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 718 " file'%s'", dex_location, dex_location_checksum, 719 oat_file->GetLocation().c_str()); 720 error_msgs->push_back(error_msg); 721 } 722 break; // Not found, done. 723 } 724 725 // Checksum test. Test must succeed when generated. 726 success = !generated; 727 if (dex_location_checksum_pointer != nullptr) { 728 success = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 729 } 730 731 if (success) { 732 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 733 if (dex_file == nullptr) { 734 success = false; 735 error_msgs->push_back(error_msg); 736 } else { 737 dex_files->push_back(dex_file); 738 } 739 } 740 741 // When we generated the file, we expect success, or something is terribly wrong. 742 CHECK_EQ(false, generated && !success) 743 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 744 << std::hex << " dex_location_checksum=" << dex_location_checksum 745 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 746 } 747 748 if (dex_files->size() == old_size) { 749 success = false; // We did not even find classes.dex 750 } 751 752 if (success) { 753 return true; 754 } else { 755 // Free all the dex files we have loaded. 756 auto it = dex_files->begin() + old_size; 757 auto it_end = dex_files->end(); 758 for (; it != it_end; it++) { 759 delete *it; 760 } 761 dex_files->erase(dex_files->begin() + old_size, it_end); 762 763 return false; 764 } 765} 766 767// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 768// complicates the loading process, as we should not use an iterative loading process, because that 769// would register the oat file and dex files that come before the broken one. Instead, check all 770// multidex ahead of time. 771bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 772 std::vector<std::string>* error_msgs, 773 std::vector<const DexFile*>* dex_files) { 774 // 1) Check whether we have an open oat file. 775 // This requires a dex checksum, use the "primary" one. 776 uint32_t dex_location_checksum; 777 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 778 bool have_checksum = true; 779 std::string checksum_error_msg; 780 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 781 dex_location_checksum_pointer = nullptr; 782 have_checksum = false; 783 } 784 785 bool needs_registering = false; 786 787 std::unique_ptr<const OatFile> open_oat_file(FindOpenedOatFile(oat_location, dex_location, 788 dex_location_checksum_pointer)); 789 790 // 2) If we do not have an open one, maybe there's one on disk already. 791 792 // In case the oat file is not open, we play a locking game here so 793 // that if two different processes race to load and register or generate 794 // (or worse, one tries to open a partial generated file) we will be okay. 795 // This is actually common with apps that use DexClassLoader to work 796 // around the dex method reference limit and that have a background 797 // service running in a separate process. 798 ScopedFlock scoped_flock; 799 800 if (open_oat_file.get() == nullptr) { 801 if (oat_location != nullptr) { 802 // Can only do this if we have a checksum, else error. 803 if (!have_checksum) { 804 error_msgs->push_back(checksum_error_msg); 805 return false; 806 } 807 808 std::string error_msg; 809 810 // We are loading or creating one in the future. Time to set up the file lock. 811 if (!scoped_flock.Init(oat_location, &error_msg)) { 812 error_msgs->push_back(error_msg); 813 return false; 814 } 815 816 // TODO Caller specifically asks for this oat_location. We should honor it. Probably? 817 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 818 oat_location, &error_msg)); 819 820 if (open_oat_file.get() == nullptr) { 821 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 822 dex_location, oat_location, error_msg.c_str()); 823 VLOG(class_linker) << compound_msg; 824 error_msgs->push_back(compound_msg); 825 } 826 } else { 827 // TODO: What to lock here? 828 bool obsolete_file_cleanup_failed; 829 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 830 dex_location_checksum_pointer, 831 kRuntimeISA, error_msgs, 832 &obsolete_file_cleanup_failed)); 833 // There's no point in going forward and eventually try to regenerate the 834 // file if we couldn't remove the obsolete one. Mostly likely we will fail 835 // with the same error when trying to write the new file. 836 // TODO: should we maybe do this only when we get permission issues? (i.e. EACCESS). 837 if (obsolete_file_cleanup_failed) { 838 return false; 839 } 840 } 841 needs_registering = true; 842 } 843 844 // 3) If we have an oat file, check all contained multidex files for our dex_location. 845 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 846 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, false, error_msgs, 847 dex_files); 848 if (success) { 849 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 850 if (needs_registering) { 851 // We opened the oat file, so we must register it. 852 RegisterOatFile(oat_file); 853 } 854 return true; 855 } else { 856 if (needs_registering) { 857 // We opened it, delete it. 858 open_oat_file.reset(); 859 } else { 860 open_oat_file.release(); // Do not delete open oat files. 861 } 862 } 863 864 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 865 866 // Need a checksum, fail else. 867 if (!have_checksum) { 868 error_msgs->push_back(checksum_error_msg); 869 return false; 870 } 871 872 // Look in cache location if no oat_location is given. 873 std::string cache_location; 874 if (oat_location == nullptr) { 875 // Use the dalvik cache. 876 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 877 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 878 oat_location = cache_location.c_str(); 879 } 880 881 // Definitely need to lock now. 882 if (!scoped_flock.HasFile()) { 883 std::string error_msg; 884 if (!scoped_flock.Init(oat_location, &error_msg)) { 885 error_msgs->push_back(error_msg); 886 return false; 887 } 888 } 889 890 if (Runtime::Current()->IsDex2OatEnabled()) { 891 // Create the oat file. 892 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 893 oat_location, error_msgs)); 894 } 895 896 // Failed, bail. 897 if (open_oat_file.get() == nullptr) { 898 std::string error_msg; 899 // dex2oat was disabled or crashed. Add the dex file in the list of dex_files to make progress. 900 DexFile::Open(dex_location, dex_location, &error_msg, dex_files); 901 error_msgs->push_back(error_msg); 902 return false; 903 } 904 905 // Try to load again, but stronger checks. 906 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, true, error_msgs, 907 dex_files); 908 if (success) { 909 RegisterOatFile(open_oat_file.release()); 910 return true; 911 } else { 912 return false; 913 } 914} 915 916const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 917 uint32_t dex_location_checksum, 918 const char* oat_location, 919 std::string* error_msg) { 920 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 921 !Runtime::Current()->IsCompiler(), 922 error_msg)); 923 if (oat_file.get() == nullptr) { 924 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 925 error_msg->c_str()); 926 return nullptr; 927 } 928 Runtime* runtime = Runtime::Current(); 929 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 930 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 931 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 932 if (expected_image_oat_checksum != actual_image_oat_checksum) { 933 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 934 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 935 actual_image_oat_checksum); 936 return nullptr; 937 } 938 939 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 940 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 941 if (expected_image_oat_offset != actual_image_oat_offset) { 942 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 943 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 944 actual_image_oat_offset); 945 return nullptr; 946 } 947 int32_t expected_patch_delta = image_header.GetPatchDelta(); 948 int32_t actual_patch_delta = oat_file->GetOatHeader().GetImagePatchDelta(); 949 if (expected_patch_delta != actual_patch_delta) { 950 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected patch delta %d, " 951 " found %d", oat_location, expected_patch_delta, actual_patch_delta); 952 return nullptr; 953 } 954 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 955 &dex_location_checksum); 956 if (oat_dex_file == nullptr) { 957 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 958 dex_location); 959 return nullptr; 960 } 961 uint32_t expected_dex_checksum = dex_location_checksum; 962 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 963 if (expected_dex_checksum != actual_dex_checksum) { 964 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 965 "found 0x%x", oat_location, expected_dex_checksum, 966 actual_dex_checksum); 967 return nullptr; 968 } 969 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 970 if (dex_file.get() != nullptr) { 971 return oat_file.release(); 972 } else { 973 return nullptr; 974 } 975} 976 977const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 978 int fd, const char* oat_location, 979 std::vector<std::string>* error_msgs) { 980 // Generate the output oat file for the dex file 981 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 982 std::string error_msg; 983 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 984 CHECK(!error_msg.empty()); 985 error_msgs->push_back(error_msg); 986 return nullptr; 987 } 988 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 989 !Runtime::Current()->IsCompiler(), 990 &error_msg)); 991 if (oat_file.get() == nullptr) { 992 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 993 oat_location, error_msg.c_str()); 994 error_msgs->push_back(compound_msg); 995 return nullptr; 996 } 997 998 return oat_file.release(); 999} 1000 1001bool ClassLinker::VerifyOatImageChecksum(const OatFile* oat_file, 1002 const InstructionSet instruction_set) { 1003 Runtime* runtime = Runtime::Current(); 1004 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1005 uint32_t image_oat_checksum = 0; 1006 if (instruction_set == kRuntimeISA) { 1007 const ImageHeader& image_header = image_space->GetImageHeader(); 1008 image_oat_checksum = image_header.GetOatChecksum(); 1009 } else { 1010 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1011 image_space->GetImageLocation().c_str(), instruction_set)); 1012 image_oat_checksum = image_header->GetOatChecksum(); 1013 } 1014 return oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum; 1015} 1016 1017bool ClassLinker::VerifyOatChecksums(const OatFile* oat_file, 1018 const InstructionSet instruction_set, 1019 std::string* error_msg) { 1020 Runtime* runtime = Runtime::Current(); 1021 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1022 1023 // If the requested instruction set is the same as the current runtime, 1024 // we can use the checksums directly. If it isn't, we'll have to read the 1025 // image header from the image for the right instruction set. 1026 uint32_t image_oat_checksum = 0; 1027 uintptr_t image_oat_data_begin = 0; 1028 int32_t image_patch_delta = 0; 1029 if (instruction_set == Runtime::Current()->GetInstructionSet()) { 1030 const ImageHeader& image_header = image_space->GetImageHeader(); 1031 image_oat_checksum = image_header.GetOatChecksum(); 1032 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 1033 image_patch_delta = image_header.GetPatchDelta(); 1034 } else { 1035 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1036 image_space->GetImageLocation().c_str(), instruction_set)); 1037 image_oat_checksum = image_header->GetOatChecksum(); 1038 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 1039 image_patch_delta = image_header->GetPatchDelta(); 1040 } 1041 const OatHeader& oat_header = oat_file->GetOatHeader(); 1042 bool ret = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 1043 && (oat_header.GetImagePatchDelta() == image_patch_delta) 1044 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 1045 if (!ret) { 1046 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d, %d) with (0x%x, %" PRIdPTR ", %d)", 1047 oat_file->GetLocation().c_str(), 1048 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1049 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1050 oat_file->GetOatHeader().GetImagePatchDelta(), 1051 image_oat_checksum, image_oat_data_begin, image_patch_delta); 1052 } 1053 return ret; 1054} 1055 1056bool ClassLinker::VerifyOatAndDexFileChecksums(const OatFile* oat_file, 1057 const char* dex_location, 1058 uint32_t dex_location_checksum, 1059 const InstructionSet instruction_set, 1060 std::string* error_msg) { 1061 if (!VerifyOatChecksums(oat_file, instruction_set, error_msg)) { 1062 return false; 1063 } 1064 1065 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 1066 &dex_location_checksum); 1067 if (oat_dex_file == NULL) { 1068 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 1069 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 1070 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 1071 for (size_t i = 0; i < oat_dex_files.size(); i++) { 1072 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 1073 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 1074 oat_file->GetLocation().c_str(), 1075 oat_dex_file->GetDexFileLocation().c_str()); 1076 } 1077 return false; 1078 } 1079 1080 if (dex_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) { 1081 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1082 oat_file->GetLocation().c_str(), 1083 oat_dex_file->GetDexFileLocationChecksum(), 1084 dex_location, dex_location_checksum); 1085 return false; 1086 } 1087 return true; 1088} 1089 1090bool ClassLinker::VerifyOatWithDexFile(const OatFile* oat_file, 1091 const char* dex_location, 1092 std::string* error_msg) { 1093 CHECK(oat_file != nullptr); 1094 CHECK(dex_location != nullptr); 1095 std::unique_ptr<const DexFile> dex_file; 1096 uint32_t dex_location_checksum; 1097 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 1098 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1099 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1100 // directory. 1101 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1102 if (oat_dex_file == nullptr) { 1103 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1104 "dex file '%s': %s", oat_file->GetLocation().c_str(), dex_location, 1105 error_msg->c_str()); 1106 return false; 1107 } 1108 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1109 } else { 1110 bool verified = VerifyOatAndDexFileChecksums(oat_file, dex_location, dex_location_checksum, 1111 kRuntimeISA, error_msg); 1112 if (!verified) { 1113 return false; 1114 } 1115 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1116 &dex_location_checksum)->OpenDexFile(error_msg)); 1117 } 1118 return dex_file.get() != nullptr; 1119} 1120 1121const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1122 const char* dex_location, 1123 const uint32_t* const dex_location_checksum, 1124 InstructionSet isa, 1125 std::vector<std::string>* error_msgs, 1126 bool* obsolete_file_cleanup_failed) { 1127 *obsolete_file_cleanup_failed = false; 1128 bool already_opened = false; 1129 std::string dex_location_str(dex_location); 1130 std::unique_ptr<const OatFile> oat_file(OpenOatFileFromDexLocation(dex_location_str, isa, 1131 &already_opened, 1132 obsolete_file_cleanup_failed, 1133 error_msgs)); 1134 std::string error_msg; 1135 if (oat_file.get() == nullptr) { 1136 error_msgs->push_back(StringPrintf("Failed to open oat file from dex location '%s'", 1137 dex_location)); 1138 return nullptr; 1139 } else if (!VerifyOatWithDexFile(oat_file.get(), dex_location, &error_msg)) { 1140 error_msgs->push_back(StringPrintf("Failed to verify oat file '%s' found for dex location " 1141 "'%s': %s", oat_file->GetLocation().c_str(), dex_location, 1142 error_msg.c_str())); 1143 return nullptr; 1144 } else { 1145 return oat_file.release(); 1146 } 1147} 1148 1149const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1150 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1151 for (size_t i = 0; i < oat_files_.size(); i++) { 1152 const OatFile* oat_file = oat_files_[i]; 1153 DCHECK(oat_file != nullptr); 1154 if (oat_file->GetLocation() == oat_location) { 1155 return oat_file; 1156 } 1157 } 1158 return nullptr; 1159} 1160 1161const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_location, 1162 InstructionSet isa, 1163 bool *already_opened, 1164 bool *obsolete_file_cleanup_failed, 1165 std::vector<std::string>* error_msgs) { 1166 // Find out if we've already opened the file 1167 const OatFile* ret = nullptr; 1168 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1169 ret = FindOpenedOatFileFromOatLocation(odex_filename); 1170 if (ret != nullptr) { 1171 *already_opened = true; 1172 return ret; 1173 } 1174 1175 std::string dalvik_cache; 1176 bool have_android_data = false; 1177 bool have_dalvik_cache = false; 1178 GetDalvikCache(GetInstructionSetString(kRuntimeISA), false, &dalvik_cache, 1179 &have_android_data, &have_dalvik_cache); 1180 std::string cache_filename; 1181 if (have_dalvik_cache) { 1182 cache_filename = GetDalvikCacheFilenameOrDie(dex_location.c_str(), dalvik_cache.c_str()); 1183 ret = FindOpenedOatFileFromOatLocation(cache_filename); 1184 if (ret != nullptr) { 1185 *already_opened = true; 1186 return ret; 1187 } 1188 } else { 1189 // If we need to relocate we should just place odex back where it started. 1190 cache_filename = odex_filename; 1191 } 1192 1193 ret = nullptr; 1194 1195 // We know that neither the odex nor the cache'd version is already in use, if it even exists. 1196 // 1197 // Now we do the following: 1198 // 1) Try and open the odex version 1199 // 2) If present, checksum-verified & relocated correctly return it 1200 // 3) Close the odex version to free up its address space. 1201 // 4) Try and open the cache version 1202 // 5) If present, checksum-verified & relocated correctly return it 1203 // 6) Close the cache version to free up its address space. 1204 // 7) If we should relocate: 1205 // a) If we have opened and checksum-verified the odex version relocate it to 1206 // 'cache_filename' and return it 1207 // b) If we have opened and checksum-verified the cache version relocate it in place and return 1208 // it. This should not happen often (I think only the run-test's will hit this case). 1209 // 8) If the cache-version was present we should delete it since it must be obsolete if we get to 1210 // this point. 1211 // 9) Return nullptr 1212 1213 *already_opened = false; 1214 const Runtime* runtime = Runtime::Current(); 1215 CHECK(runtime != nullptr); 1216 bool executable = !runtime->IsCompiler(); 1217 1218 std::string odex_error_msg; 1219 bool should_patch_system = false; 1220 bool odex_checksum_verified = false; 1221 { 1222 // There is a high probability that these both these oat files map similar/the same address 1223 // spaces so we must scope them like this so they each gets its turn. 1224 std::unique_ptr<OatFile> odex_oat_file(OatFile::Open(odex_filename, odex_filename, NULL, 1225 executable, &odex_error_msg)); 1226 if (odex_oat_file.get() != nullptr && CheckOatFile(odex_oat_file.get(), isa, 1227 &odex_checksum_verified, 1228 &odex_error_msg)) { 1229 error_msgs->push_back(odex_error_msg); 1230 return odex_oat_file.release(); 1231 } else if (odex_checksum_verified) { 1232 // We can just relocate 1233 should_patch_system = true; 1234 odex_error_msg = "Image Patches are incorrect"; 1235 } 1236 } 1237 1238 1239 std::string cache_error_msg; 1240 bool should_patch_cache = false; 1241 bool cache_checksum_verified = false; 1242 if (have_dalvik_cache) { 1243 std::unique_ptr<OatFile> cache_oat_file(OatFile::Open(cache_filename, cache_filename, NULL, 1244 executable, &cache_error_msg)); 1245 if (cache_oat_file.get() != nullptr && CheckOatFile(cache_oat_file.get(), isa, 1246 &cache_checksum_verified, 1247 &cache_error_msg)) { 1248 error_msgs->push_back(cache_error_msg); 1249 return cache_oat_file.release(); 1250 } else if (cache_checksum_verified) { 1251 // We can just relocate 1252 should_patch_cache = true; 1253 cache_error_msg = "Image Patches are incorrect"; 1254 } 1255 } else if (have_android_data) { 1256 // dalvik_cache does not exist but android data does. This means we should be able to create 1257 // it, so we should try. 1258 GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA), true); 1259 } 1260 1261 ret = nullptr; 1262 std::string error_msg; 1263 if (runtime->CanRelocate()) { 1264 // Run relocation 1265 const std::string& image_location = 1266 Runtime::Current()->GetHeap()->GetImageSpace()->GetImageLocation(); 1267 if (odex_checksum_verified && should_patch_system) { 1268 ret = PatchAndRetrieveOat(odex_filename, cache_filename, image_location, isa, &error_msg); 1269 } else if (cache_checksum_verified && should_patch_cache) { 1270 CHECK(have_dalvik_cache); 1271 ret = PatchAndRetrieveOat(cache_filename, cache_filename, image_location, isa, &error_msg); 1272 } 1273 } 1274 if (ret == nullptr && have_dalvik_cache && OS::FileExists(cache_filename.c_str())) { 1275 // implicitly: were able to fine where the cached version is but we were unable to use it, 1276 // either as a destination for relocation or to open a file. We should delete it if it is 1277 // there. 1278 if (TEMP_FAILURE_RETRY(unlink(cache_filename.c_str())) != 0) { 1279 std::string rm_error_msg = StringPrintf("Failed to remove obsolete file from %s when " 1280 "searching for dex file %s: %s", 1281 cache_filename.c_str(), dex_location.c_str(), 1282 strerror(errno)); 1283 error_msgs->push_back(rm_error_msg); 1284 VLOG(class_linker) << rm_error_msg; 1285 // Let the caller know that we couldn't remove the obsolete file. 1286 // This is a good indication that further writes may fail as well. 1287 *obsolete_file_cleanup_failed = true; 1288 } 1289 } 1290 if (ret == nullptr) { 1291 VLOG(class_linker) << error_msg; 1292 error_msgs->push_back(error_msg); 1293 std::string relocation_msg; 1294 if (runtime->CanRelocate()) { 1295 relocation_msg = StringPrintf(" and relocation failed"); 1296 } 1297 if (have_dalvik_cache && cache_checksum_verified) { 1298 error_msg = StringPrintf("Failed to open oat file from %s (error %s) or %s " 1299 "(error %s)%s.", odex_filename.c_str(), odex_error_msg.c_str(), 1300 cache_filename.c_str(), cache_error_msg.c_str(), 1301 relocation_msg.c_str()); 1302 } else { 1303 error_msg = StringPrintf("Failed to open oat file from %s (error %s) (no " 1304 "dalvik_cache availible)%s.", odex_filename.c_str(), 1305 odex_error_msg.c_str(), relocation_msg.c_str()); 1306 } 1307 VLOG(class_linker) << error_msg; 1308 error_msgs->push_back(error_msg); 1309 } 1310 return ret; 1311} 1312 1313const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat, 1314 const std::string& output_oat, 1315 const std::string& image_location, 1316 InstructionSet isa, 1317 std::string* error_msg) { 1318 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 1319 std::string patchoat(Runtime::Current()->GetPatchoatExecutable()); 1320 1321 std::string isa_arg("--instruction-set="); 1322 isa_arg += GetInstructionSetString(isa); 1323 std::string input_oat_filename_arg("--input-oat-file="); 1324 input_oat_filename_arg += input_oat; 1325 std::string output_oat_filename_arg("--output-oat-file="); 1326 output_oat_filename_arg += output_oat; 1327 std::string patched_image_arg("--patched-image-location="); 1328 patched_image_arg += image_location; 1329 1330 std::vector<std::string> argv; 1331 argv.push_back(patchoat); 1332 argv.push_back(isa_arg); 1333 argv.push_back(input_oat_filename_arg); 1334 argv.push_back(output_oat_filename_arg); 1335 argv.push_back(patched_image_arg); 1336 1337 std::string command_line(Join(argv, ' ')); 1338 LOG(INFO) << "Relocate Oat File: " << command_line; 1339 bool success = Exec(argv, error_msg); 1340 if (success) { 1341 std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, NULL, 1342 !Runtime::Current()->IsCompiler(), error_msg)); 1343 bool checksum_verified = false; 1344 if (output.get() != nullptr && CheckOatFile(output.get(), isa, &checksum_verified, error_msg)) { 1345 return output.release(); 1346 } else if (output.get() != nullptr) { 1347 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1348 "but output file '%s' failed verifcation: %s", 1349 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1350 } else { 1351 *error_msg = StringPrintf("Patching of oat file '%s' succeeded " 1352 "but was unable to open output file '%s': %s", 1353 input_oat.c_str(), output_oat.c_str(), error_msg->c_str()); 1354 } 1355 } else { 1356 *error_msg = StringPrintf("Patching of oat file '%s to '%s' " 1357 "failed: %s", input_oat.c_str(), output_oat.c_str(), 1358 error_msg->c_str()); 1359 } 1360 return nullptr; 1361} 1362 1363int32_t ClassLinker::GetRequiredDelta(const OatFile* oat_file, InstructionSet isa) { 1364 Runtime* runtime = Runtime::Current(); 1365 int32_t real_patch_delta; 1366 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1367 if (isa == Runtime::Current()->GetInstructionSet()) { 1368 const ImageHeader& image_header = image_space->GetImageHeader(); 1369 real_patch_delta = image_header.GetPatchDelta(); 1370 } else { 1371 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1372 image_space->GetImageLocation().c_str(), isa)); 1373 real_patch_delta = image_header->GetPatchDelta(); 1374 } 1375 const OatHeader& oat_header = oat_file->GetOatHeader(); 1376 return real_patch_delta - oat_header.GetImagePatchDelta(); 1377} 1378 1379bool ClassLinker::CheckOatFile(const OatFile* oat_file, InstructionSet isa, 1380 bool* checksum_verified, 1381 std::string* error_msg) { 1382 std::string compound_msg("Oat file failed to verify: "); 1383 Runtime* runtime = Runtime::Current(); 1384 uint32_t real_image_checksum; 1385 void* real_image_oat_offset; 1386 int32_t real_patch_delta; 1387 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 1388 if (isa == Runtime::Current()->GetInstructionSet()) { 1389 const ImageHeader& image_header = image_space->GetImageHeader(); 1390 real_image_checksum = image_header.GetOatChecksum(); 1391 real_image_oat_offset = image_header.GetOatDataBegin(); 1392 real_patch_delta = image_header.GetPatchDelta(); 1393 } else { 1394 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 1395 image_space->GetImageLocation().c_str(), isa)); 1396 real_image_checksum = image_header->GetOatChecksum(); 1397 real_image_oat_offset = image_header->GetOatDataBegin(); 1398 real_patch_delta = image_header->GetPatchDelta(); 1399 } 1400 1401 const OatHeader& oat_header = oat_file->GetOatHeader(); 1402 1403 uint32_t oat_image_checksum = oat_header.GetImageFileLocationOatChecksum(); 1404 *checksum_verified = oat_image_checksum == real_image_checksum; 1405 if (!*checksum_verified) { 1406 compound_msg += StringPrintf(" Oat Image Checksum Incorrect (expected 0x%x, recieved 0x%x)", 1407 real_image_checksum, oat_image_checksum); 1408 } 1409 1410 void* oat_image_oat_offset = 1411 reinterpret_cast<void*>(oat_header.GetImageFileLocationOatDataBegin()); 1412 bool offset_verified = oat_image_oat_offset == real_image_oat_offset; 1413 if (!offset_verified) { 1414 compound_msg += StringPrintf(" Oat Image oat offset incorrect (expected 0x%p, recieved 0x%p)", 1415 real_image_oat_offset, oat_image_oat_offset); 1416 } 1417 1418 int32_t oat_patch_delta = oat_header.GetImagePatchDelta(); 1419 bool patch_delta_verified = oat_patch_delta == real_patch_delta; 1420 if (!patch_delta_verified) { 1421 compound_msg += StringPrintf(" Oat image patch delta incorrect (expected 0x%x, recieved 0x%x)", 1422 real_patch_delta, oat_patch_delta); 1423 } 1424 1425 bool ret = (*checksum_verified && offset_verified && patch_delta_verified); 1426 if (ret) { 1427 *error_msg = compound_msg; 1428 } 1429 return ret; 1430} 1431 1432const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1433 std::string* error_msg) { 1434 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1435 if (oat_file != nullptr) { 1436 return oat_file; 1437 } 1438 1439 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1440 error_msg); 1441 if (oat_file == NULL) { 1442 return NULL; 1443 } 1444 return oat_file; 1445} 1446 1447static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1448 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1449 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1450 1451 DCHECK(obj != NULL); 1452 DCHECK(class_linker != NULL); 1453 1454 if (obj->IsArtMethod()) { 1455 mirror::ArtMethod* method = obj->AsArtMethod(); 1456 if (!method->IsNative()) { 1457 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1458 if (method != Runtime::Current()->GetResolutionMethod()) { 1459 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1460 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1461 } 1462 } 1463 } 1464} 1465 1466void ClassLinker::InitFromImage() { 1467 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1468 CHECK(!init_done_); 1469 1470 Thread* self = Thread::Current(); 1471 gc::Heap* heap = Runtime::Current()->GetHeap(); 1472 gc::space::ImageSpace* space = heap->GetImageSpace(); 1473 dex_cache_image_class_lookup_required_ = true; 1474 CHECK(space != NULL); 1475 OatFile& oat_file = GetImageOatFile(space); 1476 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1477 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1478 const char* image_file_location = oat_file.GetOatHeader(). 1479 GetStoreValueByKey(OatHeader::kImageLocationKey); 1480 CHECK(image_file_location == nullptr || *image_file_location == 0); 1481 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1482 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1483 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1484 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1485 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1486 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1487 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1488 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1489 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1490 1491 StackHandleScope<1> hs(self); 1492 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1493 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1494 AsObjectArray<mirror::Class>())); 1495 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1496 1497 // Special case of setting up the String class early so that we can test arbitrary objects 1498 // as being Strings or not 1499 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1500 1501 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1502 static_cast<uint32_t>(dex_caches->GetLength())); 1503 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1504 StackHandleScope<1> hs(self); 1505 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1506 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1507 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1508 nullptr); 1509 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1510 std::string error_msg; 1511 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1512 if (dex_file == NULL) { 1513 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1514 << " from within oat file " << oat_file.GetLocation() 1515 << " error '" << error_msg << "'"; 1516 } 1517 1518 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1519 1520 AppendToBootClassPath(*dex_file, dex_cache); 1521 } 1522 1523 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1524 // bitmap walk. 1525 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1526 1527 // Set entry point to interpreter if in InterpretOnly mode. 1528 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1529 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1530 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1531 } 1532 1533 // reinit class_roots_ 1534 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1535 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(class_roots.Get()); 1536 1537 // reinit array_iftable_ from any array class instance, they should be == 1538 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable()); 1539 DCHECK(array_iftable_.Read() == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1540 // String class root was set above 1541 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference)); 1542 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1543 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1544 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1545 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1546 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1547 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1548 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1549 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1550 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1551 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1552 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1553 1554 FinishInit(self); 1555 1556 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1557} 1558 1559void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1560 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1561 if ((flags & kVisitRootFlagAllRoots) != 0) { 1562 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1563 it.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1564 } 1565 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1566 for (auto& pair : new_class_roots_) { 1567 mirror::Class* old_ref = pair.second.Read<kWithoutReadBarrier>(); 1568 pair.second.VisitRoot(callback, arg, 0, kRootStickyClass); 1569 mirror::Class* new_ref = pair.second.Read<kWithoutReadBarrier>(); 1570 if (UNLIKELY(new_ref != old_ref)) { 1571 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1572 // corresponding object. This is slow, but luckily for us, this may only happen with a 1573 // concurrent moving GC. 1574 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1575 it != end && it->first == pair.first; ++it) { 1576 // If the class stored matches the old class, update it to the new value. 1577 if (old_ref == it->second.Read<kWithoutReadBarrier>()) { 1578 it->second = GcRoot<mirror::Class>(new_ref); 1579 } 1580 } 1581 } 1582 } 1583 } 1584 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1585 new_class_roots_.clear(); 1586 } 1587 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1588 log_new_class_table_roots_ = true; 1589 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1590 log_new_class_table_roots_ = false; 1591 } 1592 // We deliberately ignore the class roots in the image since we 1593 // handle image roots by using the MS/CMS rescanning of dirty cards. 1594} 1595 1596// Keep in sync with InitCallback. Anything we visit, we need to 1597// reinit references to when reinitializing a ClassLinker from a 1598// mapped image. 1599void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1600 class_roots_.VisitRoot(callback, arg, 0, kRootVMInternal); 1601 Thread* self = Thread::Current(); 1602 { 1603 ReaderMutexLock mu(self, dex_lock_); 1604 if ((flags & kVisitRootFlagAllRoots) != 0) { 1605 for (GcRoot<mirror::DexCache>& dex_cache : dex_caches_) { 1606 dex_cache.VisitRoot(callback, arg, 0, kRootVMInternal); 1607 } 1608 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1609 for (size_t index : new_dex_cache_roots_) { 1610 dex_caches_[index].VisitRoot(callback, arg, 0, kRootVMInternal); 1611 } 1612 } 1613 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1614 new_dex_cache_roots_.clear(); 1615 } 1616 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1617 log_new_dex_caches_roots_ = true; 1618 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1619 log_new_dex_caches_roots_ = false; 1620 } 1621 } 1622 VisitClassRoots(callback, arg, flags); 1623 array_iftable_.VisitRoot(callback, arg, 0, kRootVMInternal); 1624 DCHECK(!array_iftable_.IsNull()); 1625 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1626 if (!find_array_class_cache_[i].IsNull()) { 1627 find_array_class_cache_[i].VisitRoot(callback, arg, 0, kRootVMInternal); 1628 } 1629 } 1630} 1631 1632void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1633 if (dex_cache_image_class_lookup_required_) { 1634 MoveImageClassesToClassTable(); 1635 } 1636 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1637 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 1638 mirror::Class* c = it.second.Read(); 1639 if (!visitor(c, arg)) { 1640 return; 1641 } 1642 } 1643} 1644 1645static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1646 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1647 classes->insert(c); 1648 return true; 1649} 1650 1651void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1652 std::set<mirror::Class*> classes; 1653 VisitClasses(GetClassesVisitor, &classes); 1654 for (mirror::Class* klass : classes) { 1655 if (!visitor(klass, arg)) { 1656 return; 1657 } 1658 } 1659} 1660 1661ClassLinker::~ClassLinker() { 1662 mirror::Class::ResetClass(); 1663 mirror::String::ResetClass(); 1664 mirror::Reference::ResetClass(); 1665 mirror::ArtField::ResetClass(); 1666 mirror::ArtMethod::ResetClass(); 1667 mirror::BooleanArray::ResetArrayClass(); 1668 mirror::ByteArray::ResetArrayClass(); 1669 mirror::CharArray::ResetArrayClass(); 1670 mirror::DoubleArray::ResetArrayClass(); 1671 mirror::FloatArray::ResetArrayClass(); 1672 mirror::IntArray::ResetArrayClass(); 1673 mirror::LongArray::ResetArrayClass(); 1674 mirror::ShortArray::ResetArrayClass(); 1675 mirror::Throwable::ResetClass(); 1676 mirror::StackTraceElement::ResetClass(); 1677 STLDeleteElements(&boot_class_path_); 1678 STLDeleteElements(&oat_files_); 1679} 1680 1681mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1682 gc::Heap* heap = Runtime::Current()->GetHeap(); 1683 StackHandleScope<16> hs(self); 1684 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1685 Handle<mirror::DexCache> dex_cache( 1686 hs.NewHandle(down_cast<mirror::DexCache*>( 1687 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1688 VoidFunctor())))); 1689 if (dex_cache.Get() == NULL) { 1690 return NULL; 1691 } 1692 Handle<mirror::String> 1693 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1694 if (location.Get() == NULL) { 1695 return NULL; 1696 } 1697 Handle<mirror::ObjectArray<mirror::String>> 1698 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1699 if (strings.Get() == NULL) { 1700 return NULL; 1701 } 1702 Handle<mirror::ObjectArray<mirror::Class>> 1703 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1704 if (types.Get() == NULL) { 1705 return NULL; 1706 } 1707 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1708 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1709 if (methods.Get() == NULL) { 1710 return NULL; 1711 } 1712 Handle<mirror::ObjectArray<mirror::ArtField>> 1713 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1714 if (fields.Get() == NULL) { 1715 return NULL; 1716 } 1717 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1718 fields.Get()); 1719 return dex_cache.Get(); 1720} 1721 1722mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1723 uint32_t class_size) { 1724 DCHECK_GE(class_size, sizeof(mirror::Class)); 1725 gc::Heap* heap = Runtime::Current()->GetHeap(); 1726 mirror::Class::InitializeClassVisitor visitor(class_size); 1727 mirror::Object* k = kMovingClasses ? 1728 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1729 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1730 if (UNLIKELY(k == nullptr)) { 1731 CHECK(self->IsExceptionPending()); // OOME. 1732 return nullptr; 1733 } 1734 return k->AsClass(); 1735} 1736 1737mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1738 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1739} 1740 1741mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1742 return down_cast<mirror::ArtField*>( 1743 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1744} 1745 1746mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1747 return down_cast<mirror::ArtMethod*>( 1748 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1749} 1750 1751mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1752 Thread* self, size_t length) { 1753 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1754 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1755} 1756 1757mirror::Class* ClassLinker::EnsureResolved(Thread* self, const char* descriptor, 1758 mirror::Class* klass) { 1759 DCHECK(klass != NULL); 1760 1761 // For temporary classes we must wait for them to be retired. 1762 if (init_done_ && klass->IsTemp()) { 1763 CHECK(!klass->IsResolved()); 1764 if (klass->IsErroneous()) { 1765 ThrowEarlierClassFailure(klass); 1766 return nullptr; 1767 } 1768 StackHandleScope<1> hs(self); 1769 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 1770 ObjectLock<mirror::Class> lock(self, h_class); 1771 // Loop and wait for the resolving thread to retire this class. 1772 while (!h_class->IsRetired() && !h_class->IsErroneous()) { 1773 lock.WaitIgnoringInterrupts(); 1774 } 1775 if (h_class->IsErroneous()) { 1776 ThrowEarlierClassFailure(h_class.Get()); 1777 return nullptr; 1778 } 1779 CHECK(h_class->IsRetired()); 1780 // Get the updated class from class table. 1781 klass = LookupClass(descriptor, h_class.Get()->GetClassLoader()); 1782 } 1783 1784 // Wait for the class if it has not already been linked. 1785 if (!klass->IsResolved() && !klass->IsErroneous()) { 1786 StackHandleScope<1> hs(self); 1787 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1788 ObjectLock<mirror::Class> lock(self, h_class); 1789 // Check for circular dependencies between classes. 1790 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1791 ThrowClassCircularityError(h_class.Get()); 1792 h_class->SetStatus(mirror::Class::kStatusError, self); 1793 return nullptr; 1794 } 1795 // Wait for the pending initialization to complete. 1796 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1797 lock.WaitIgnoringInterrupts(); 1798 } 1799 } 1800 1801 if (klass->IsErroneous()) { 1802 ThrowEarlierClassFailure(klass); 1803 return nullptr; 1804 } 1805 // Return the loaded class. No exceptions should be pending. 1806 CHECK(klass->IsResolved()) << PrettyClass(klass); 1807 self->AssertNoPendingException(); 1808 return klass; 1809} 1810 1811mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1812 Handle<mirror::ClassLoader> class_loader) { 1813 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1814 DCHECK(self != nullptr); 1815 self->AssertNoPendingException(); 1816 if (descriptor[1] == '\0') { 1817 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1818 // for primitive classes that aren't backed by dex files. 1819 return FindPrimitiveClass(descriptor[0]); 1820 } 1821 // Find the class in the loaded classes table. 1822 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1823 if (klass != NULL) { 1824 return EnsureResolved(self, descriptor, klass); 1825 } 1826 // Class is not yet loaded. 1827 if (descriptor[0] == '[') { 1828 return CreateArrayClass(self, descriptor, class_loader); 1829 } else if (class_loader.Get() == nullptr) { 1830 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1831 if (pair.second != NULL) { 1832 StackHandleScope<1> hs(self); 1833 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1834 } 1835 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1836 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1837 // throw of a NoClassDefFoundError. 1838 if (IsInBootClassPath(descriptor)) { 1839 mirror::Class* system_class = FindSystemClass(self, descriptor); 1840 CHECK(system_class != NULL); 1841 return system_class; 1842 } 1843 // Next try the compile time class path. 1844 const std::vector<const DexFile*>* class_path; 1845 { 1846 ScopedObjectAccessUnchecked soa(self); 1847 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1848 soa.AddLocalReference<jobject>(class_loader.Get())); 1849 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1850 } 1851 1852 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1853 if (pair.second != NULL) { 1854 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1855 } 1856 1857 } else { 1858 ScopedObjectAccessUnchecked soa(self); 1859 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1860 soa.AddLocalReference<jobject>(class_loader.Get())); 1861 std::string class_name_string(DescriptorToDot(descriptor)); 1862 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1863 { 1864 ScopedThreadStateChange tsc(self, kNative); 1865 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1866 soa.Env()->NewStringUTF(class_name_string.c_str())); 1867 if (class_name_object.get() == NULL) { 1868 return NULL; 1869 } 1870 CHECK(class_loader_object.get() != NULL); 1871 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1872 WellKnownClasses::java_lang_ClassLoader_loadClass, 1873 class_name_object.get())); 1874 } 1875 if (self->IsExceptionPending()) { 1876 // If the ClassLoader threw, pass that exception up. 1877 return NULL; 1878 } else if (result.get() == NULL) { 1879 // broken loader - throw NPE to be compatible with Dalvik 1880 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1881 class_name_string.c_str()).c_str()); 1882 return NULL; 1883 } else { 1884 // success, return mirror::Class* 1885 return soa.Decode<mirror::Class*>(result.get()); 1886 } 1887 } 1888 1889 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1890 return NULL; 1891} 1892 1893mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1894 Handle<mirror::ClassLoader> class_loader, 1895 const DexFile& dex_file, 1896 const DexFile::ClassDef& dex_class_def) { 1897 Thread* self = Thread::Current(); 1898 StackHandleScope<3> hs(self); 1899 auto klass = hs.NewHandle<mirror::Class>(nullptr); 1900 bool should_allocate = false; 1901 1902 // Load the class from the dex file. 1903 if (UNLIKELY(!init_done_)) { 1904 // finish up init of hand crafted class_roots_ 1905 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1906 klass.Assign(GetClassRoot(kJavaLangObject)); 1907 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1908 klass.Assign(GetClassRoot(kJavaLangClass)); 1909 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1910 klass.Assign(GetClassRoot(kJavaLangString)); 1911 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) { 1912 klass.Assign(GetClassRoot(kJavaLangRefReference)); 1913 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1914 klass.Assign(GetClassRoot(kJavaLangDexCache)); 1915 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1916 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 1917 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1918 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 1919 } else { 1920 should_allocate = true; 1921 } 1922 } else { 1923 should_allocate = true; 1924 } 1925 1926 if (should_allocate) { 1927 // Allocate a class with the status of not ready. 1928 // Interface object should get the right size here. Regular class will 1929 // figure out the right size later and be replaced with one of the right 1930 // size when the class becomes resolved. 1931 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def))); 1932 } 1933 if (UNLIKELY(klass.Get() == nullptr)) { 1934 CHECK(self->IsExceptionPending()); // Expect an OOME. 1935 return nullptr; 1936 } 1937 klass->SetDexCache(FindDexCache(dex_file)); 1938 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 1939 ObjectLock<mirror::Class> lock(self, klass); 1940 if (self->IsExceptionPending()) { 1941 // An exception occured during load, set status to erroneous while holding klass' lock in case 1942 // notification is necessary. 1943 if (!klass->IsErroneous()) { 1944 klass->SetStatus(mirror::Class::kStatusError, self); 1945 } 1946 return nullptr; 1947 } 1948 klass->SetClinitThreadId(self->GetTid()); 1949 1950 // Add the newly loaded class to the loaded classes table. 1951 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 1952 if (existing != nullptr) { 1953 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1954 // this thread to block. 1955 return EnsureResolved(self, descriptor, existing); 1956 } 1957 1958 // Finish loading (if necessary) by finding parents 1959 CHECK(!klass->IsLoaded()); 1960 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1961 // Loading failed. 1962 if (!klass->IsErroneous()) { 1963 klass->SetStatus(mirror::Class::kStatusError, self); 1964 } 1965 return nullptr; 1966 } 1967 CHECK(klass->IsLoaded()); 1968 // Link the class (if necessary) 1969 CHECK(!klass->IsResolved()); 1970 // TODO: Use fast jobjects? 1971 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1972 1973 mirror::Class* new_class = nullptr; 1974 if (!LinkClass(self, descriptor, klass, interfaces, &new_class)) { 1975 // Linking failed. 1976 if (!klass->IsErroneous()) { 1977 klass->SetStatus(mirror::Class::kStatusError, self); 1978 } 1979 return nullptr; 1980 } 1981 CHECK(new_class != nullptr) << descriptor; 1982 CHECK(new_class->IsResolved()) << descriptor; 1983 1984 Handle<mirror::Class> new_class_h(hs.NewHandle(new_class)); 1985 1986 /* 1987 * We send CLASS_PREPARE events to the debugger from here. The 1988 * definition of "preparation" is creating the static fields for a 1989 * class and initializing them to the standard default values, but not 1990 * executing any code (that comes later, during "initialization"). 1991 * 1992 * We did the static preparation in LinkClass. 1993 * 1994 * The class has been prepared and resolved but possibly not yet verified 1995 * at this point. 1996 */ 1997 Dbg::PostClassPrepare(new_class_h.Get()); 1998 1999 return new_class_h.Get(); 2000} 2001 2002uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file, 2003 const DexFile::ClassDef& dex_class_def) { 2004 const byte* class_data = dex_file.GetClassData(dex_class_def); 2005 size_t num_ref = 0; 2006 size_t num_32 = 0; 2007 size_t num_64 = 0; 2008 if (class_data != NULL) { 2009 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 2010 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 2011 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 2012 char c = descriptor[0]; 2013 if (c == 'L' || c == '[') { 2014 num_ref++; 2015 } else if (c == 'J' || c == 'D') { 2016 num_64++; 2017 } else { 2018 num_32++; 2019 } 2020 } 2021 } 2022 return mirror::Class::ComputeClassSize(false, 0, num_32, num_64, num_ref); 2023} 2024 2025OatFile::OatClass ClassLinker::FindOatClass(const DexFile& dex_file, uint16_t class_def_idx, 2026 bool* found) { 2027 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 2028 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2029 if (oat_file == nullptr) { 2030 *found = false; 2031 return OatFile::OatClass::Invalid(); 2032 } 2033 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2034 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2035 &dex_location_checksum); 2036 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 2037 *found = true; 2038 return oat_dex_file->GetOatClass(class_def_idx); 2039} 2040 2041static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 2042 uint32_t method_idx) { 2043 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 2044 const byte* class_data = dex_file.GetClassData(class_def); 2045 CHECK(class_data != NULL); 2046 ClassDataItemIterator it(dex_file, class_data); 2047 // Skip fields 2048 while (it.HasNextStaticField()) { 2049 it.Next(); 2050 } 2051 while (it.HasNextInstanceField()) { 2052 it.Next(); 2053 } 2054 // Process methods 2055 size_t class_def_method_index = 0; 2056 while (it.HasNextDirectMethod()) { 2057 if (it.GetMemberIndex() == method_idx) { 2058 return class_def_method_index; 2059 } 2060 class_def_method_index++; 2061 it.Next(); 2062 } 2063 while (it.HasNextVirtualMethod()) { 2064 if (it.GetMemberIndex() == method_idx) { 2065 return class_def_method_index; 2066 } 2067 class_def_method_index++; 2068 it.Next(); 2069 } 2070 DCHECK(!it.HasNext()); 2071 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 2072 return 0; 2073} 2074 2075const OatFile::OatMethod ClassLinker::FindOatMethodFor(mirror::ArtMethod* method, bool* found) { 2076 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 2077 // method for direct methods (or virtual methods made direct). 2078 mirror::Class* declaring_class = method->GetDeclaringClass(); 2079 size_t oat_method_index; 2080 if (method->IsStatic() || method->IsDirect()) { 2081 // Simple case where the oat method index was stashed at load time. 2082 oat_method_index = method->GetMethodIndex(); 2083 } else { 2084 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 2085 // by search for its position in the declared virtual methods. 2086 oat_method_index = declaring_class->NumDirectMethods(); 2087 size_t end = declaring_class->NumVirtualMethods(); 2088 bool found = false; 2089 for (size_t i = 0; i < end; i++) { 2090 if (declaring_class->GetVirtualMethod(i) == method) { 2091 found = true; 2092 break; 2093 } 2094 oat_method_index++; 2095 } 2096 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 2097 } 2098 DCHECK_EQ(oat_method_index, 2099 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 2100 method->GetDeclaringClass()->GetDexClassDefIndex(), 2101 method->GetDexMethodIndex())); 2102 OatFile::OatClass oat_class = FindOatClass(*declaring_class->GetDexCache()->GetDexFile(), 2103 declaring_class->GetDexClassDefIndex(), 2104 found); 2105 if (!found) { 2106 return OatFile::OatMethod::Invalid(); 2107 } 2108 *found = true; 2109 return oat_class.GetOatMethod(oat_method_index); 2110} 2111 2112// Special case to get oat code without overwriting a trampoline. 2113const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 2114 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2115 if (method->IsProxyMethod()) { 2116 return GetQuickProxyInvokeHandler(); 2117 } 2118 bool found; 2119 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2120 const void* result = nullptr; 2121 if (found) { 2122 result = oat_method.GetQuickCode(); 2123 } 2124 2125 if (result == nullptr) { 2126 if (method->IsNative()) { 2127 // No code and native? Use generic trampoline. 2128 result = GetQuickGenericJniTrampoline(); 2129 } else if (method->IsPortableCompiled()) { 2130 // No code? Do we expect portable code? 2131 result = GetQuickToPortableBridge(); 2132 } else { 2133 // No code? You must mean to go into the interpreter. 2134 result = GetQuickToInterpreterBridge(); 2135 } 2136 } 2137 return result; 2138} 2139 2140const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 2141 bool* have_portable_code) { 2142 CHECK(!method->IsAbstract()) << PrettyMethod(method); 2143 *have_portable_code = false; 2144 if (method->IsProxyMethod()) { 2145 return GetPortableProxyInvokeHandler(); 2146 } 2147 bool found; 2148 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found); 2149 const void* result = nullptr; 2150 const void* quick_code = nullptr; 2151 if (found) { 2152 result = oat_method.GetPortableCode(); 2153 quick_code = oat_method.GetQuickCode(); 2154 } 2155 2156 if (result == nullptr) { 2157 if (quick_code == nullptr) { 2158 // No code? You must mean to go into the interpreter. 2159 result = GetPortableToInterpreterBridge(); 2160 } else { 2161 // No code? But there's quick code, so use a bridge. 2162 result = GetPortableToQuickBridge(); 2163 } 2164 } else { 2165 *have_portable_code = true; 2166 } 2167 return result; 2168} 2169 2170const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2171 uint32_t method_idx) { 2172 bool found; 2173 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2174 if (!found) { 2175 return nullptr; 2176 } 2177 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2178 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 2179} 2180 2181const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 2182 uint32_t method_idx) { 2183 bool found; 2184 OatFile::OatClass oat_class = FindOatClass(dex_file, class_def_idx, &found); 2185 if (!found) { 2186 return nullptr; 2187 } 2188 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 2189 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 2190} 2191 2192// Returns true if the method must run with interpreter, false otherwise. 2193static bool NeedsInterpreter( 2194 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 2195 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2196 if ((quick_code == nullptr) && (portable_code == nullptr)) { 2197 // No code: need interpreter. 2198 // May return true for native code, in the case of generic JNI 2199 // DCHECK(!method->IsNative()); 2200 return true; 2201 } 2202#ifdef ART_SEA_IR_MODE 2203 ScopedObjectAccess soa(Thread::Current()); 2204 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 2205 LOG(INFO) << "Found " << PrettyMethod(method); 2206 return false; 2207 } 2208#endif 2209 // If interpreter mode is enabled, every method (except native and proxy) must 2210 // be run with interpreter. 2211 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 2212 !method->IsNative() && !method->IsProxyMethod(); 2213} 2214 2215void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 2216 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 2217 if (klass->NumDirectMethods() == 0) { 2218 return; // No direct methods => no static methods. 2219 } 2220 Runtime* runtime = Runtime::Current(); 2221 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 2222 return; // OAT file unavailable. 2223 } 2224 const DexFile& dex_file = klass->GetDexFile(); 2225 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 2226 CHECK(dex_class_def != nullptr); 2227 const byte* class_data = dex_file.GetClassData(*dex_class_def); 2228 // There should always be class data if there were direct methods. 2229 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 2230 ClassDataItemIterator it(dex_file, class_data); 2231 // Skip fields 2232 while (it.HasNextStaticField()) { 2233 it.Next(); 2234 } 2235 while (it.HasNextInstanceField()) { 2236 it.Next(); 2237 } 2238 bool has_oat_class; 2239 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2240 &has_oat_class); 2241 // Link the code of methods skipped by LinkCode. 2242 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 2243 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 2244 if (!method->IsStatic()) { 2245 // Only update static methods. 2246 continue; 2247 } 2248 const void* portable_code = nullptr; 2249 const void* quick_code = nullptr; 2250 if (has_oat_class) { 2251 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index); 2252 portable_code = oat_method.GetPortableCode(); 2253 quick_code = oat_method.GetQuickCode(); 2254 } 2255 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 2256 bool have_portable_code = false; 2257 if (enter_interpreter) { 2258 // Use interpreter entry point. 2259 // Check whether the method is native, in which case it's generic JNI. 2260 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 2261 quick_code = GetQuickGenericJniTrampoline(); 2262 portable_code = GetPortableToQuickBridge(); 2263 } else { 2264 portable_code = GetPortableToInterpreterBridge(); 2265 quick_code = GetQuickToInterpreterBridge(); 2266 } 2267 } else { 2268 if (portable_code == nullptr) { 2269 portable_code = GetPortableToQuickBridge(); 2270 } else { 2271 have_portable_code = true; 2272 } 2273 if (quick_code == nullptr) { 2274 quick_code = GetQuickToPortableBridge(); 2275 } 2276 } 2277 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 2278 have_portable_code); 2279 } 2280 // Ignore virtual methods on the iterator. 2281} 2282 2283void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 2284 const DexFile& dex_file, uint32_t dex_method_index, 2285 uint32_t method_index) { 2286 if (Runtime::Current()->IsCompiler()) { 2287 // The following code only applies to a non-compiler runtime. 2288 return; 2289 } 2290 // Method shouldn't have already been linked. 2291 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2292 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 2293 if (oat_class != nullptr) { 2294 // Every kind of method should at least get an invoke stub from the oat_method. 2295 // non-abstract methods also get their code pointers. 2296 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 2297 oat_method.LinkMethod(method.Get()); 2298 } 2299 2300 // Install entry point from interpreter. 2301 bool enter_interpreter = NeedsInterpreter(method.Get(), 2302 method->GetEntryPointFromQuickCompiledCode(), 2303 method->GetEntryPointFromPortableCompiledCode()); 2304 if (enter_interpreter && !method->IsNative()) { 2305 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 2306 } else { 2307 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 2308 } 2309 2310 if (method->IsAbstract()) { 2311 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2312 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2313 return; 2314 } 2315 2316 bool have_portable_code = false; 2317 if (method->IsStatic() && !method->IsConstructor()) { 2318 // For static methods excluding the class initializer, install the trampoline. 2319 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 2320 // after initializing class (see ClassLinker::InitializeClass method). 2321 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 2322 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 2323 } else if (enter_interpreter) { 2324 if (!method->IsNative()) { 2325 // Set entry point from compiled code if there's no code or in interpreter only mode. 2326 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 2327 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 2328 } else { 2329 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 2330 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2331 } 2332 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 2333 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 2334 have_portable_code = true; 2335 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 2336 } else { 2337 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 2338 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 2339 } 2340 2341 if (method->IsNative()) { 2342 // Unregistering restores the dlsym lookup stub. 2343 method->UnregisterNative(Thread::Current()); 2344 2345 if (enter_interpreter) { 2346 // We have a native method here without code. Then it should have either the GenericJni 2347 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 2348 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 2349 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 2350 } 2351 } 2352 2353 // Allow instrumentation its chance to hijack code. 2354 Runtime* runtime = Runtime::Current(); 2355 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 2356 method->GetEntryPointFromQuickCompiledCode(), 2357 method->GetEntryPointFromPortableCompiledCode(), 2358 have_portable_code); 2359} 2360 2361void ClassLinker::LoadClass(const DexFile& dex_file, 2362 const DexFile::ClassDef& dex_class_def, 2363 Handle<mirror::Class> klass, 2364 mirror::ClassLoader* class_loader) { 2365 CHECK(klass.Get() != NULL); 2366 CHECK(klass->GetDexCache() != NULL); 2367 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2368 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2369 CHECK(descriptor != NULL); 2370 2371 klass->SetClass(GetClassRoot(kJavaLangClass)); 2372 if (kUseBakerOrBrooksReadBarrier) { 2373 klass->AssertReadBarrierPointer(); 2374 } 2375 uint32_t access_flags = dex_class_def.access_flags_; 2376 // Make sure that none of our runtime-only flags are set. 2377 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2378 klass->SetAccessFlags(access_flags); 2379 klass->SetClassLoader(class_loader); 2380 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2381 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2382 2383 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2384 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2385 2386 const byte* class_data = dex_file.GetClassData(dex_class_def); 2387 if (class_data == NULL) { 2388 return; // no fields or methods - for example a marker interface 2389 } 2390 2391 2392 bool has_oat_class = false; 2393 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2394 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(), 2395 &has_oat_class); 2396 if (has_oat_class) { 2397 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2398 } 2399 } 2400 if (!has_oat_class) { 2401 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2402 } 2403} 2404 2405void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2406 const byte* class_data, 2407 Handle<mirror::Class> klass, 2408 mirror::ClassLoader* class_loader, 2409 const OatFile::OatClass* oat_class) { 2410 // Load fields. 2411 ClassDataItemIterator it(dex_file, class_data); 2412 Thread* self = Thread::Current(); 2413 if (it.NumStaticFields() != 0) { 2414 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2415 if (UNLIKELY(statics == NULL)) { 2416 CHECK(self->IsExceptionPending()); // OOME. 2417 return; 2418 } 2419 klass->SetSFields(statics); 2420 } 2421 if (it.NumInstanceFields() != 0) { 2422 mirror::ObjectArray<mirror::ArtField>* fields = 2423 AllocArtFieldArray(self, it.NumInstanceFields()); 2424 if (UNLIKELY(fields == NULL)) { 2425 CHECK(self->IsExceptionPending()); // OOME. 2426 return; 2427 } 2428 klass->SetIFields(fields); 2429 } 2430 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2431 StackHandleScope<1> hs(self); 2432 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2433 if (UNLIKELY(sfield.Get() == NULL)) { 2434 CHECK(self->IsExceptionPending()); // OOME. 2435 return; 2436 } 2437 klass->SetStaticField(i, sfield.Get()); 2438 LoadField(dex_file, it, klass, sfield); 2439 } 2440 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2441 StackHandleScope<1> hs(self); 2442 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2443 if (UNLIKELY(ifield.Get() == NULL)) { 2444 CHECK(self->IsExceptionPending()); // OOME. 2445 return; 2446 } 2447 klass->SetInstanceField(i, ifield.Get()); 2448 LoadField(dex_file, it, klass, ifield); 2449 } 2450 2451 // Load methods. 2452 if (it.NumDirectMethods() != 0) { 2453 // TODO: append direct methods to class object 2454 mirror::ObjectArray<mirror::ArtMethod>* directs = 2455 AllocArtMethodArray(self, it.NumDirectMethods()); 2456 if (UNLIKELY(directs == NULL)) { 2457 CHECK(self->IsExceptionPending()); // OOME. 2458 return; 2459 } 2460 klass->SetDirectMethods(directs); 2461 } 2462 if (it.NumVirtualMethods() != 0) { 2463 // TODO: append direct methods to class object 2464 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2465 AllocArtMethodArray(self, it.NumVirtualMethods()); 2466 if (UNLIKELY(virtuals == NULL)) { 2467 CHECK(self->IsExceptionPending()); // OOME. 2468 return; 2469 } 2470 klass->SetVirtualMethods(virtuals); 2471 } 2472 size_t class_def_method_index = 0; 2473 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2474 StackHandleScope<1> hs(self); 2475 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2476 if (UNLIKELY(method.Get() == NULL)) { 2477 CHECK(self->IsExceptionPending()); // OOME. 2478 return; 2479 } 2480 klass->SetDirectMethod(i, method.Get()); 2481 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2482 method->SetMethodIndex(class_def_method_index); 2483 class_def_method_index++; 2484 } 2485 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2486 StackHandleScope<1> hs(self); 2487 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2488 if (UNLIKELY(method.Get() == NULL)) { 2489 CHECK(self->IsExceptionPending()); // OOME. 2490 return; 2491 } 2492 klass->SetVirtualMethod(i, method.Get()); 2493 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2494 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2495 class_def_method_index++; 2496 } 2497 DCHECK(!it.HasNext()); 2498} 2499 2500void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2501 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2502 uint32_t field_idx = it.GetMemberIndex(); 2503 dst->SetDexFieldIndex(field_idx); 2504 dst->SetDeclaringClass(klass.Get()); 2505 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2506} 2507 2508mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2509 const ClassDataItemIterator& it, 2510 Handle<mirror::Class> klass) { 2511 uint32_t dex_method_idx = it.GetMemberIndex(); 2512 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2513 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2514 2515 mirror::ArtMethod* dst = AllocArtMethod(self); 2516 if (UNLIKELY(dst == NULL)) { 2517 CHECK(self->IsExceptionPending()); // OOME. 2518 return NULL; 2519 } 2520 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2521 2522 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2523 dst->SetDexMethodIndex(dex_method_idx); 2524 dst->SetDeclaringClass(klass.Get()); 2525 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2526 2527 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2528 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2529 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2530 2531 uint32_t access_flags = it.GetMemberAccessFlags(); 2532 2533 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2534 // Set finalizable flag on declaring class. 2535 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2536 // Void return type. 2537 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged. 2538 klass->SetFinalizable(); 2539 } else { 2540 std::string temp; 2541 const char* klass_descriptor = klass->GetDescriptor(&temp); 2542 // The Enum class declares a "final" finalize() method to prevent subclasses from 2543 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2544 // subclasses, so we exclude it here. 2545 // We also want to avoid setting the flag on Object, where we know that finalize() is 2546 // empty. 2547 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 && 2548 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) { 2549 klass->SetFinalizable(); 2550 } 2551 } 2552 } 2553 } else if (method_name[0] == '<') { 2554 // Fix broken access flags for initializers. Bug 11157540. 2555 bool is_init = (strcmp("<init>", method_name) == 0); 2556 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2557 if (UNLIKELY(!is_init && !is_clinit)) { 2558 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2559 } else { 2560 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2561 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2562 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2563 access_flags |= kAccConstructor; 2564 } 2565 } 2566 } 2567 dst->SetAccessFlags(access_flags); 2568 2569 self->EndAssertNoThreadSuspension(old_cause); 2570 return dst; 2571} 2572 2573void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2574 Thread* self = Thread::Current(); 2575 StackHandleScope<1> hs(self); 2576 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2577 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2578 AppendToBootClassPath(dex_file, dex_cache); 2579} 2580 2581void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2582 Handle<mirror::DexCache> dex_cache) { 2583 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2584 boot_class_path_.push_back(&dex_file); 2585 RegisterDexFile(dex_file, dex_cache); 2586} 2587 2588bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2589 dex_lock_.AssertSharedHeld(Thread::Current()); 2590 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2591 mirror::DexCache* dex_cache = GetDexCache(i); 2592 if (dex_cache->GetDexFile() == &dex_file) { 2593 return true; 2594 } 2595 } 2596 return false; 2597} 2598 2599bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2600 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2601 return IsDexFileRegisteredLocked(dex_file); 2602} 2603 2604void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2605 Handle<mirror::DexCache> dex_cache) { 2606 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2607 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2608 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2609 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2610 dex_caches_.push_back(GcRoot<mirror::DexCache>(dex_cache.Get())); 2611 dex_cache->SetDexFile(&dex_file); 2612 if (log_new_dex_caches_roots_) { 2613 // TODO: This is not safe if we can remove dex caches. 2614 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2615 } 2616} 2617 2618void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2619 Thread* self = Thread::Current(); 2620 { 2621 ReaderMutexLock mu(self, dex_lock_); 2622 if (IsDexFileRegisteredLocked(dex_file)) { 2623 return; 2624 } 2625 } 2626 // Don't alloc while holding the lock, since allocation may need to 2627 // suspend all threads and another thread may need the dex_lock_ to 2628 // get to a suspend point. 2629 StackHandleScope<1> hs(self); 2630 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2631 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2632 { 2633 WriterMutexLock mu(self, dex_lock_); 2634 if (IsDexFileRegisteredLocked(dex_file)) { 2635 return; 2636 } 2637 RegisterDexFileLocked(dex_file, dex_cache); 2638 } 2639} 2640 2641void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2642 Handle<mirror::DexCache> dex_cache) { 2643 WriterMutexLock mu(Thread::Current(), dex_lock_); 2644 RegisterDexFileLocked(dex_file, dex_cache); 2645} 2646 2647mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2648 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2649 // Search assuming unique-ness of dex file. 2650 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2651 mirror::DexCache* dex_cache = GetDexCache(i); 2652 if (dex_cache->GetDexFile() == &dex_file) { 2653 return dex_cache; 2654 } 2655 } 2656 // Search matching by location name. 2657 std::string location(dex_file.GetLocation()); 2658 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2659 mirror::DexCache* dex_cache = GetDexCache(i); 2660 if (dex_cache->GetDexFile()->GetLocation() == location) { 2661 return dex_cache; 2662 } 2663 } 2664 // Failure, dump diagnostic and abort. 2665 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2666 mirror::DexCache* dex_cache = GetDexCache(i); 2667 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2668 } 2669 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2670 return NULL; 2671} 2672 2673void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2674 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2675 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2676 mirror::DexCache* dex_cache = GetDexCache(i); 2677 dex_cache->Fixup(resolution_method); 2678 } 2679} 2680 2681mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2682 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize()); 2683 if (UNLIKELY(klass == NULL)) { 2684 return NULL; 2685 } 2686 return InitializePrimitiveClass(klass, type); 2687} 2688 2689mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2690 Primitive::Type type) { 2691 CHECK(primitive_class != NULL); 2692 // Must hold lock on object when initializing. 2693 Thread* self = Thread::Current(); 2694 StackHandleScope<1> hs(self); 2695 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2696 ObjectLock<mirror::Class> lock(self, h_class); 2697 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2698 primitive_class->SetPrimitiveType(type); 2699 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2700 const char* descriptor = Primitive::Descriptor(type); 2701 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2702 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2703 return primitive_class; 2704} 2705 2706// Create an array class (i.e. the class object for the array, not the 2707// array itself). "descriptor" looks like "[C" or "[[[[B" or 2708// "[Ljava/lang/String;". 2709// 2710// If "descriptor" refers to an array of primitives, look up the 2711// primitive type's internally-generated class object. 2712// 2713// "class_loader" is the class loader of the class that's referring to 2714// us. It's used to ensure that we're looking for the element type in 2715// the right context. It does NOT become the class loader for the 2716// array class; that always comes from the base element class. 2717// 2718// Returns NULL with an exception raised on failure. 2719mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2720 Handle<mirror::ClassLoader> class_loader) { 2721 // Identify the underlying component type 2722 CHECK_EQ('[', descriptor[0]); 2723 StackHandleScope<2> hs(self); 2724 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2725 if (component_type.Get() == nullptr) { 2726 DCHECK(self->IsExceptionPending()); 2727 // We need to accept erroneous classes as component types. 2728 component_type.Assign(LookupClass(descriptor + 1, class_loader.Get())); 2729 if (component_type.Get() == nullptr) { 2730 DCHECK(self->IsExceptionPending()); 2731 return nullptr; 2732 } else { 2733 self->ClearException(); 2734 } 2735 } 2736 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2737 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2738 return nullptr; 2739 } 2740 // See if the component type is already loaded. Array classes are 2741 // always associated with the class loader of their underlying 2742 // element type -- an array of Strings goes with the loader for 2743 // java/lang/String -- so we need to look for it there. (The 2744 // caller should have checked for the existence of the class 2745 // before calling here, but they did so with *their* class loader, 2746 // not the component type's loader.) 2747 // 2748 // If we find it, the caller adds "loader" to the class' initiating 2749 // loader list, which should prevent us from going through this again. 2750 // 2751 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2752 // are the same, because our caller (FindClass) just did the 2753 // lookup. (Even if we get this wrong we still have correct behavior, 2754 // because we effectively do this lookup again when we add the new 2755 // class to the hash table --- necessary because of possible races with 2756 // other threads.) 2757 if (class_loader.Get() != component_type->GetClassLoader()) { 2758 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2759 if (new_class != NULL) { 2760 return new_class; 2761 } 2762 } 2763 2764 // Fill out the fields in the Class. 2765 // 2766 // It is possible to execute some methods against arrays, because 2767 // all arrays are subclasses of java_lang_Object_, so we need to set 2768 // up a vtable. We can just point at the one in java_lang_Object_. 2769 // 2770 // Array classes are simple enough that we don't need to do a full 2771 // link step. 2772 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2773 if (UNLIKELY(!init_done_)) { 2774 // Classes that were hand created, ie not by FindSystemClass 2775 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2776 new_class.Assign(GetClassRoot(kClassArrayClass)); 2777 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2778 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2779 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2780 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2781 } else if (strcmp(descriptor, 2782 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2783 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2784 } else if (strcmp(descriptor, 2785 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2786 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2787 } else if (strcmp(descriptor, "[C") == 0) { 2788 new_class.Assign(GetClassRoot(kCharArrayClass)); 2789 } else if (strcmp(descriptor, "[I") == 0) { 2790 new_class.Assign(GetClassRoot(kIntArrayClass)); 2791 } 2792 } 2793 if (new_class.Get() == nullptr) { 2794 new_class.Assign(AllocClass(self, mirror::Array::ClassSize())); 2795 if (new_class.Get() == nullptr) { 2796 return nullptr; 2797 } 2798 new_class->SetComponentType(component_type.Get()); 2799 } 2800 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2801 DCHECK(new_class->GetComponentType() != NULL); 2802 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2803 new_class->SetSuperClass(java_lang_Object); 2804 new_class->SetVTable(java_lang_Object->GetVTable()); 2805 new_class->SetPrimitiveType(Primitive::kPrimNot); 2806 new_class->SetClassLoader(component_type->GetClassLoader()); 2807 new_class->SetStatus(mirror::Class::kStatusLoaded, self); 2808 new_class->PopulateEmbeddedImtAndVTable(); 2809 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2810 // don't need to set new_class->SetObjectSize(..) 2811 // because Object::SizeOf delegates to Array::SizeOf 2812 2813 2814 // All arrays have java/lang/Cloneable and java/io/Serializable as 2815 // interfaces. We need to set that up here, so that stuff like 2816 // "instanceof" works right. 2817 // 2818 // Note: The GC could run during the call to FindSystemClass, 2819 // so we need to make sure the class object is GC-valid while we're in 2820 // there. Do this by clearing the interface list so the GC will just 2821 // think that the entries are null. 2822 2823 2824 // Use the single, global copies of "interfaces" and "iftable" 2825 // (remember not to free them for arrays). 2826 { 2827 mirror::IfTable* array_iftable = array_iftable_.Read(); 2828 CHECK(array_iftable != nullptr); 2829 new_class->SetIfTable(array_iftable); 2830 } 2831 2832 // Inherit access flags from the component type. 2833 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2834 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2835 access_flags &= kAccJavaFlagsMask; 2836 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2837 // and remove "interface". 2838 access_flags |= kAccAbstract | kAccFinal; 2839 access_flags &= ~kAccInterface; 2840 2841 new_class->SetAccessFlags(access_flags); 2842 2843 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2844 if (existing == nullptr) { 2845 return new_class.Get(); 2846 } 2847 // Another thread must have loaded the class after we 2848 // started but before we finished. Abandon what we've 2849 // done. 2850 // 2851 // (Yes, this happens.) 2852 2853 return existing; 2854} 2855 2856mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2857 switch (type) { 2858 case 'B': 2859 return GetClassRoot(kPrimitiveByte); 2860 case 'C': 2861 return GetClassRoot(kPrimitiveChar); 2862 case 'D': 2863 return GetClassRoot(kPrimitiveDouble); 2864 case 'F': 2865 return GetClassRoot(kPrimitiveFloat); 2866 case 'I': 2867 return GetClassRoot(kPrimitiveInt); 2868 case 'J': 2869 return GetClassRoot(kPrimitiveLong); 2870 case 'S': 2871 return GetClassRoot(kPrimitiveShort); 2872 case 'Z': 2873 return GetClassRoot(kPrimitiveBoolean); 2874 case 'V': 2875 return GetClassRoot(kPrimitiveVoid); 2876 default: 2877 break; 2878 } 2879 std::string printable_type(PrintableChar(type)); 2880 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2881 return NULL; 2882} 2883 2884mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2885 size_t hash) { 2886 if (VLOG_IS_ON(class_linker)) { 2887 mirror::DexCache* dex_cache = klass->GetDexCache(); 2888 std::string source; 2889 if (dex_cache != NULL) { 2890 source += " from "; 2891 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2892 } 2893 LOG(INFO) << "Loaded class " << descriptor << source; 2894 } 2895 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2896 mirror::Class* existing = 2897 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2898 if (existing != NULL) { 2899 return existing; 2900 } 2901 if (kIsDebugBuild && !klass->IsTemp() && klass->GetClassLoader() == NULL && 2902 dex_cache_image_class_lookup_required_) { 2903 // Check a class loaded with the system class loader matches one in the image if the class 2904 // is in the image. 2905 existing = LookupClassFromImage(descriptor); 2906 if (existing != NULL) { 2907 CHECK(klass == existing); 2908 } 2909 } 2910 VerifyObject(klass); 2911 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 2912 if (log_new_class_table_roots_) { 2913 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 2914 } 2915 return NULL; 2916} 2917 2918mirror::Class* ClassLinker::UpdateClass(const char* descriptor, mirror::Class* klass, 2919 size_t hash) { 2920 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2921 mirror::Class* existing = 2922 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2923 2924 if (existing == nullptr) { 2925 CHECK(klass->IsProxyClass()); 2926 return nullptr; 2927 } 2928 2929 CHECK_NE(existing, klass) << descriptor; 2930 CHECK(!existing->IsResolved()) << descriptor; 2931 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor; 2932 2933 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash; 2934 ++it) { 2935 mirror::Class* klass = it->second.Read(); 2936 if (klass == existing) { 2937 class_table_.erase(it); 2938 break; 2939 } 2940 } 2941 2942 CHECK(!klass->IsTemp()) << descriptor; 2943 if (kIsDebugBuild && klass->GetClassLoader() == nullptr && 2944 dex_cache_image_class_lookup_required_) { 2945 // Check a class loaded with the system class loader matches one in the image if the class 2946 // is in the image. 2947 existing = LookupClassFromImage(descriptor); 2948 if (existing != nullptr) { 2949 CHECK(klass == existing) << descriptor; 2950 } 2951 } 2952 VerifyObject(klass); 2953 2954 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 2955 if (log_new_class_table_roots_) { 2956 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 2957 } 2958 2959 return existing; 2960} 2961 2962bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2963 size_t hash = Hash(descriptor); 2964 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2965 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2966 it != end && it->first == hash; 2967 ++it) { 2968 mirror::Class* klass = it->second.Read(); 2969 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2970 class_table_.erase(it); 2971 return true; 2972 } 2973 } 2974 return false; 2975} 2976 2977mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2978 const mirror::ClassLoader* class_loader) { 2979 size_t hash = Hash(descriptor); 2980 { 2981 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2982 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2983 if (result != NULL) { 2984 return result; 2985 } 2986 } 2987 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2988 return NULL; 2989 } else { 2990 // Lookup failed but need to search dex_caches_. 2991 mirror::Class* result = LookupClassFromImage(descriptor); 2992 if (result != NULL) { 2993 InsertClass(descriptor, result, hash); 2994 } else { 2995 // Searching the image dex files/caches failed, we don't want to get into this situation 2996 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2997 // classes into the class table. 2998 const int32_t kMaxFailedDexCacheLookups = 1000; 2999 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 3000 MoveImageClassesToClassTable(); 3001 } 3002 } 3003 return result; 3004 } 3005} 3006 3007mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 3008 const mirror::ClassLoader* class_loader, 3009 size_t hash) { 3010 auto end = class_table_.end(); 3011 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 3012 mirror::Class* klass = it->second.Read(); 3013 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 3014 if (kIsDebugBuild) { 3015 // Check for duplicates in the table. 3016 for (++it; it != end && it->first == hash; ++it) { 3017 mirror::Class* klass2 = it->second.Read(); 3018 CHECK(!(klass2->GetClassLoader() == class_loader && 3019 klass2->DescriptorEquals(descriptor))) 3020 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 3021 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 3022 } 3023 } 3024 return klass; 3025 } 3026 } 3027 return NULL; 3028} 3029 3030static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 3031 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3032 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 3033 CHECK(image != NULL); 3034 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 3035 return root->AsObjectArray<mirror::DexCache>(); 3036} 3037 3038void ClassLinker::MoveImageClassesToClassTable() { 3039 Thread* self = Thread::Current(); 3040 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 3041 if (!dex_cache_image_class_lookup_required_) { 3042 return; // All dex cache classes are already in the class table. 3043 } 3044 const char* old_no_suspend_cause = 3045 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 3046 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3047 std::string temp; 3048 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 3049 mirror::DexCache* dex_cache = dex_caches->Get(i); 3050 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 3051 for (int32_t j = 0; j < types->GetLength(); j++) { 3052 mirror::Class* klass = types->Get(j); 3053 if (klass != NULL) { 3054 DCHECK(klass->GetClassLoader() == NULL); 3055 const char* descriptor = klass->GetDescriptor(&temp); 3056 size_t hash = Hash(descriptor); 3057 mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash); 3058 if (existing != NULL) { 3059 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 3060 << PrettyClassAndClassLoader(klass); 3061 } else { 3062 class_table_.insert(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3063 if (log_new_class_table_roots_) { 3064 new_class_roots_.push_back(std::make_pair(hash, GcRoot<mirror::Class>(klass))); 3065 } 3066 } 3067 } 3068 } 3069 } 3070 dex_cache_image_class_lookup_required_ = false; 3071 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3072} 3073 3074mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 3075 Thread* self = Thread::Current(); 3076 const char* old_no_suspend_cause = 3077 self->StartAssertNoThreadSuspension("Image class lookup"); 3078 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 3079 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 3080 mirror::DexCache* dex_cache = dex_caches->Get(i); 3081 const DexFile* dex_file = dex_cache->GetDexFile(); 3082 // Try binary searching the string/type index. 3083 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 3084 if (string_id != NULL) { 3085 const DexFile::TypeId* type_id = 3086 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 3087 if (type_id != NULL) { 3088 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 3089 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 3090 if (klass != NULL) { 3091 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3092 return klass; 3093 } 3094 } 3095 } 3096 } 3097 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 3098 return NULL; 3099} 3100 3101void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 3102 result.clear(); 3103 if (dex_cache_image_class_lookup_required_) { 3104 MoveImageClassesToClassTable(); 3105 } 3106 size_t hash = Hash(descriptor); 3107 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 3108 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 3109 it != end && it->first == hash; ++it) { 3110 mirror::Class* klass = it->second.Read(); 3111 if (klass->DescriptorEquals(descriptor)) { 3112 result.push_back(klass); 3113 } 3114 } 3115} 3116 3117void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 3118 // TODO: assert that the monitor on the Class is held 3119 Thread* self = Thread::Current(); 3120 ObjectLock<mirror::Class> lock(self, klass); 3121 3122 // Don't attempt to re-verify if already sufficiently verified. 3123 if (klass->IsVerified() || 3124 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 3125 return; 3126 } 3127 3128 // The class might already be erroneous, for example at compile time if we attempted to verify 3129 // this class as a parent to another. 3130 if (klass->IsErroneous()) { 3131 ThrowEarlierClassFailure(klass.Get()); 3132 return; 3133 } 3134 3135 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 3136 klass->SetStatus(mirror::Class::kStatusVerifying, self); 3137 } else { 3138 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 3139 << PrettyClass(klass.Get()); 3140 CHECK(!Runtime::Current()->IsCompiler()); 3141 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 3142 } 3143 3144 // Skip verification if disabled. 3145 if (!Runtime::Current()->IsVerificationEnabled()) { 3146 klass->SetStatus(mirror::Class::kStatusVerified, self); 3147 return; 3148 } 3149 3150 // Verify super class. 3151 StackHandleScope<2> hs(self); 3152 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 3153 if (super.Get() != NULL) { 3154 // Acquire lock to prevent races on verifying the super class. 3155 ObjectLock<mirror::Class> lock(self, super); 3156 3157 if (!super->IsVerified() && !super->IsErroneous()) { 3158 VerifyClass(super); 3159 } 3160 if (!super->IsCompileTimeVerified()) { 3161 std::string error_msg( 3162 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 3163 PrettyDescriptor(klass.Get()).c_str(), 3164 PrettyDescriptor(super.Get()).c_str())); 3165 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3166 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 3167 if (cause.Get() != nullptr) { 3168 self->ClearException(); 3169 } 3170 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3171 if (cause.Get() != nullptr) { 3172 self->GetException(nullptr)->SetCause(cause.Get()); 3173 } 3174 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 3175 if (Runtime::Current()->IsCompiler()) { 3176 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 3177 } 3178 klass->SetStatus(mirror::Class::kStatusError, self); 3179 return; 3180 } 3181 } 3182 3183 // Try to use verification information from the oat file, otherwise do runtime verification. 3184 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 3185 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 3186 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 3187 if (oat_file_class_status == mirror::Class::kStatusError) { 3188 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 3189 << PrettyDescriptor(klass.Get()) << " in " 3190 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 3191 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 3192 PrettyDescriptor(klass.Get()).c_str()); 3193 klass->SetStatus(mirror::Class::kStatusError, self); 3194 return; 3195 } 3196 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 3197 std::string error_msg; 3198 if (!preverified) { 3199 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 3200 Runtime::Current()->IsCompiler(), 3201 &error_msg); 3202 } 3203 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 3204 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 3205 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 3206 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3207 << " because: " << error_msg; 3208 } 3209 self->AssertNoPendingException(); 3210 // Make sure all classes referenced by catch blocks are resolved. 3211 ResolveClassExceptionHandlerTypes(dex_file, klass); 3212 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 3213 // Even though there were no verifier failures we need to respect whether the super-class 3214 // was verified or requiring runtime reverification. 3215 if (super.Get() == NULL || super->IsVerified()) { 3216 klass->SetStatus(mirror::Class::kStatusVerified, self); 3217 } else { 3218 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3219 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3220 // Pretend a soft failure occured so that we don't consider the class verified below. 3221 verifier_failure = verifier::MethodVerifier::kSoftFailure; 3222 } 3223 } else { 3224 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 3225 // Soft failures at compile time should be retried at runtime. Soft 3226 // failures at runtime will be handled by slow paths in the generated 3227 // code. Set status accordingly. 3228 if (Runtime::Current()->IsCompiler()) { 3229 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 3230 } else { 3231 klass->SetStatus(mirror::Class::kStatusVerified, self); 3232 } 3233 } 3234 } else { 3235 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 3236 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 3237 << " because: " << error_msg; 3238 self->AssertNoPendingException(); 3239 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 3240 klass->SetStatus(mirror::Class::kStatusError, self); 3241 } 3242 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 3243 // Class is verified so we don't need to do any access check on its methods. 3244 // Let the interpreter know it by setting the kAccPreverified flag onto each 3245 // method. 3246 // Note: we're going here during compilation and at runtime. When we set the 3247 // kAccPreverified flag when compiling image classes, the flag is recorded 3248 // in the image and is set when loading the image. 3249 klass->SetPreverifiedFlagOnAllMethods(); 3250 } 3251} 3252 3253bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 3254 mirror::Class::Status& oat_file_class_status) { 3255 // If we're compiling, we can only verify the class using the oat file if 3256 // we are not compiling the image or if the class we're verifying is not part of 3257 // the app. In other words, we will only check for preverification of bootclasspath 3258 // classes. 3259 if (Runtime::Current()->IsCompiler()) { 3260 // Are we compiling the bootclasspath? 3261 if (!Runtime::Current()->UseCompileTimeClassPath()) { 3262 return false; 3263 } 3264 // We are compiling an app (not the image). 3265 3266 // Is this an app class? (I.e. not a bootclasspath class) 3267 if (klass->GetClassLoader() != NULL) { 3268 return false; 3269 } 3270 } 3271 3272 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 3273 // Make this work with gtests, which do not set up the image properly. 3274 // TODO: we should clean up gtests to set up the image path properly. 3275 if (Runtime::Current()->IsCompiler() || (oat_file == NULL)) { 3276 return false; 3277 } 3278 3279 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3280 uint dex_location_checksum = dex_file.GetLocationChecksum(); 3281 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 3282 &dex_location_checksum); 3283 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 3284 uint16_t class_def_index = klass->GetDexClassDefIndex(); 3285 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 3286 if (oat_file_class_status == mirror::Class::kStatusVerified || 3287 oat_file_class_status == mirror::Class::kStatusInitialized) { 3288 return true; 3289 } 3290 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 3291 // Compile time verification failed with a soft error. Compile time verification can fail 3292 // because we have incomplete type information. Consider the following: 3293 // class ... { 3294 // Foo x; 3295 // .... () { 3296 // if (...) { 3297 // v1 gets assigned a type of resolved class Foo 3298 // } else { 3299 // v1 gets assigned a type of unresolved class Bar 3300 // } 3301 // iput x = v1 3302 // } } 3303 // when we merge v1 following the if-the-else it results in Conflict 3304 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 3305 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 3306 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 3307 // at compile time). 3308 return false; 3309 } 3310 if (oat_file_class_status == mirror::Class::kStatusError) { 3311 // Compile time verification failed with a hard error. This is caused by invalid instructions 3312 // in the class. These errors are unrecoverable. 3313 return false; 3314 } 3315 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 3316 // Status is uninitialized if we couldn't determine the status at compile time, for example, 3317 // not loading the class. 3318 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 3319 // isn't a problem and this case shouldn't occur 3320 return false; 3321 } 3322 std::string temp; 3323 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 3324 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 3325 << klass->GetDescriptor(&temp); 3326 3327 return false; 3328} 3329 3330void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 3331 Handle<mirror::Class> klass) { 3332 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 3333 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 3334 } 3335 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 3336 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 3337 } 3338} 3339 3340void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 3341 mirror::ArtMethod* method) { 3342 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 3343 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 3344 if (code_item == NULL) { 3345 return; // native or abstract method 3346 } 3347 if (code_item->tries_size_ == 0) { 3348 return; // nothing to process 3349 } 3350 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 3351 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 3352 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 3353 for (uint32_t idx = 0; idx < handlers_size; idx++) { 3354 CatchHandlerIterator iterator(handlers_ptr); 3355 for (; iterator.HasNext(); iterator.Next()) { 3356 // Ensure exception types are resolved so that they don't need resolution to be delivered, 3357 // unresolved exception types will be ignored by exception delivery 3358 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 3359 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 3360 if (exception_type == NULL) { 3361 DCHECK(Thread::Current()->IsExceptionPending()); 3362 Thread::Current()->ClearException(); 3363 } 3364 } 3365 } 3366 handlers_ptr = iterator.EndDataPointer(); 3367 } 3368} 3369 3370static void CheckProxyConstructor(mirror::ArtMethod* constructor); 3371static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 3372 Handle<mirror::ArtMethod> prototype); 3373 3374mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 3375 jobjectArray interfaces, jobject loader, 3376 jobjectArray methods, jobjectArray throws) { 3377 Thread* self = soa.Self(); 3378 StackHandleScope<8> hs(self); 3379 Handle<mirror::Class> klass(hs.NewHandle( 3380 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class)))); 3381 if (klass.Get() == NULL) { 3382 CHECK(self->IsExceptionPending()); // OOME. 3383 return NULL; 3384 } 3385 DCHECK(klass->GetClass() != NULL); 3386 klass->SetObjectSize(sizeof(mirror::Proxy)); 3387 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 3388 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 3389 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 3390 klass->SetName(soa.Decode<mirror::String*>(name)); 3391 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 3392 klass->SetDexCache(proxy_class->GetDexCache()); 3393 klass->SetStatus(mirror::Class::kStatusIdx, self); 3394 3395 // Instance fields are inherited, but we add a couple of static fields... 3396 { 3397 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 3398 if (UNLIKELY(sfields == NULL)) { 3399 CHECK(self->IsExceptionPending()); // OOME. 3400 return NULL; 3401 } 3402 klass->SetSFields(sfields); 3403 } 3404 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 3405 // our proxy, so Class.getInterfaces doesn't return the flattened set. 3406 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 3407 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 3408 CHECK(self->IsExceptionPending()); // OOME. 3409 return nullptr; 3410 } 3411 klass->SetStaticField(0, interfaces_sfield.Get()); 3412 interfaces_sfield->SetDexFieldIndex(0); 3413 interfaces_sfield->SetDeclaringClass(klass.Get()); 3414 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3415 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 3416 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 3417 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3418 CHECK(self->IsExceptionPending()); // OOME. 3419 return nullptr; 3420 } 3421 klass->SetStaticField(1, throws_sfield.Get()); 3422 throws_sfield->SetDexFieldIndex(1); 3423 throws_sfield->SetDeclaringClass(klass.Get()); 3424 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3425 3426 // Proxies have 1 direct method, the constructor 3427 { 3428 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3429 if (UNLIKELY(directs == nullptr)) { 3430 CHECK(self->IsExceptionPending()); // OOME. 3431 return nullptr; 3432 } 3433 klass->SetDirectMethods(directs); 3434 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3435 if (UNLIKELY(constructor == nullptr)) { 3436 CHECK(self->IsExceptionPending()); // OOME. 3437 return nullptr; 3438 } 3439 klass->SetDirectMethod(0, constructor); 3440 } 3441 3442 // Create virtual method using specified prototypes. 3443 size_t num_virtual_methods = 3444 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3445 { 3446 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3447 num_virtual_methods); 3448 if (UNLIKELY(virtuals == NULL)) { 3449 CHECK(self->IsExceptionPending()); // OOME. 3450 return NULL; 3451 } 3452 klass->SetVirtualMethods(virtuals); 3453 } 3454 for (size_t i = 0; i < num_virtual_methods; ++i) { 3455 StackHandleScope<1> hs(self); 3456 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3457 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3458 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3459 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3460 if (UNLIKELY(clone == nullptr)) { 3461 CHECK(self->IsExceptionPending()); // OOME. 3462 return nullptr; 3463 } 3464 klass->SetVirtualMethod(i, clone); 3465 } 3466 3467 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3468 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3469 self->AssertNoPendingException(); 3470 3471 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3472 mirror::Class* new_class = nullptr; 3473 { 3474 ObjectLock<mirror::Class> resolution_lock(self, klass); // Must hold lock on object when resolved. 3475 // Link the fields and virtual methods, creating vtable and iftables 3476 Handle<mirror::ObjectArray<mirror::Class> > h_interfaces( 3477 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3478 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) { 3479 klass->SetStatus(mirror::Class::kStatusError, self); 3480 return nullptr; 3481 } 3482 } 3483 3484 CHECK(klass->IsRetired()); 3485 CHECK_NE(klass.Get(), new_class); 3486 klass.Assign(new_class); 3487 3488 CHECK_EQ(interfaces_sfield->GetDeclaringClass(), new_class); 3489 interfaces_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3490 CHECK_EQ(throws_sfield->GetDeclaringClass(), new_class); 3491 throws_sfield->SetObject<false>(klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws)); 3492 3493 { 3494 // Lock on klass is released. Lock new class object. 3495 ObjectLock<mirror::Class> initialization_lock(self, klass); 3496 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3497 } 3498 3499 // sanity checks 3500 if (kIsDebugBuild) { 3501 CHECK(klass->GetIFields() == nullptr); 3502 CheckProxyConstructor(klass->GetDirectMethod(0)); 3503 for (size_t i = 0; i < num_virtual_methods; ++i) { 3504 StackHandleScope<2> hs(self); 3505 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3506 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3507 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3508 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3509 CheckProxyMethod(virtual_method, prototype); 3510 } 3511 3512 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3513 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3514 decoded_name->ToModifiedUtf8().c_str())); 3515 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3516 3517 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3518 decoded_name->ToModifiedUtf8().c_str())); 3519 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3520 3521 CHECK_EQ(klass.Get()->GetInterfaces(), 3522 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3523 CHECK_EQ(klass.Get()->GetThrows(), 3524 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3525 } 3526 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3527 CHECK(existing == nullptr); 3528 return klass.Get(); 3529} 3530 3531std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3532 DCHECK(proxy_class->IsProxyClass()); 3533 mirror::String* name = proxy_class->GetName(); 3534 DCHECK(name != NULL); 3535 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3536} 3537 3538mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3539 mirror::ArtMethod* proxy_method) { 3540 DCHECK(proxy_class->IsProxyClass()); 3541 DCHECK(proxy_method->IsProxyMethod()); 3542 // Locate the dex cache of the original interface/Object 3543 mirror::DexCache* dex_cache = nullptr; 3544 { 3545 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3546 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3547 mirror::DexCache* a_dex_cache = GetDexCache(i); 3548 if (proxy_method->HasSameDexCacheResolvedTypes(a_dex_cache->GetResolvedTypes())) { 3549 dex_cache = a_dex_cache; 3550 break; 3551 } 3552 } 3553 } 3554 CHECK(dex_cache != nullptr); 3555 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3556 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3557 CHECK(resolved_method != nullptr); 3558 return resolved_method; 3559} 3560 3561 3562mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3563 Handle<mirror::Class> klass, 3564 mirror::Class* proxy_class) { 3565 // Create constructor for Proxy that must initialize h 3566 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3567 proxy_class->GetDirectMethods(); 3568 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3569 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3570 mirror::ArtMethod* constructor = down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3571 if (constructor == nullptr) { 3572 CHECK(self->IsExceptionPending()); // OOME. 3573 return nullptr; 3574 } 3575 // Make the proxy constructor's code always point to the uninstrumented code. This avoids 3576 // getting a method enter event for the proxy constructor as the proxy constructor doesn't 3577 // have an activation. 3578 bool have_portable_code; 3579 constructor->SetEntryPointFromQuickCompiledCode(GetQuickOatCodeFor(proxy_constructor)); 3580 constructor->SetEntryPointFromPortableCompiledCode(GetPortableOatCodeFor(proxy_constructor, 3581 &have_portable_code)); 3582 3583 // Make this constructor public and fix the class to be our Proxy version 3584 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3585 constructor->SetDeclaringClass(klass.Get()); 3586 return constructor; 3587} 3588 3589static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3590 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3591 CHECK(constructor->IsConstructor()); 3592 CHECK_STREQ(constructor->GetName(), "<init>"); 3593 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3594 "(Ljava/lang/reflect/InvocationHandler;)V"); 3595 DCHECK(constructor->IsPublic()); 3596} 3597 3598mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3599 Handle<mirror::Class> klass, 3600 Handle<mirror::ArtMethod> prototype) { 3601 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3602 // prototype method 3603 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3604 prototype.Get()); 3605 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3606 // as necessary 3607 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3608 if (UNLIKELY(method == NULL)) { 3609 CHECK(self->IsExceptionPending()); // OOME. 3610 return NULL; 3611 } 3612 3613 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3614 // the intersection of throw exceptions as defined in Proxy 3615 method->SetDeclaringClass(klass.Get()); 3616 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3617 3618 // At runtime the method looks like a reference and argument saving method, clone the code 3619 // related parameters from this method. 3620 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3621 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3622 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3623 3624 return method; 3625} 3626 3627static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3628 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3629 // Basic sanity 3630 CHECK(!prototype->IsFinal()); 3631 CHECK(method->IsFinal()); 3632 CHECK(!method->IsAbstract()); 3633 3634 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3635 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3636 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3637 CHECK(prototype->HasSameDexCacheResolvedMethods(method.Get())); 3638 CHECK(prototype->HasSameDexCacheResolvedTypes(method.Get())); 3639 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3640 3641 MethodHelper mh(method); 3642 MethodHelper mh2(prototype); 3643 CHECK_STREQ(method->GetName(), prototype->GetName()); 3644 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3645 // More complex sanity - via dex cache 3646 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3647} 3648 3649static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3650 bool can_init_parents) 3651 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3652 if (can_init_statics && can_init_parents) { 3653 return true; 3654 } 3655 if (!can_init_statics) { 3656 // Check if there's a class initializer. 3657 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3658 if (clinit != NULL) { 3659 return false; 3660 } 3661 // Check if there are encoded static values needing initialization. 3662 if (klass->NumStaticFields() != 0) { 3663 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3664 DCHECK(dex_class_def != NULL); 3665 if (dex_class_def->static_values_off_ != 0) { 3666 return false; 3667 } 3668 } 3669 } 3670 if (!klass->IsInterface() && klass->HasSuperClass()) { 3671 mirror::Class* super_class = klass->GetSuperClass(); 3672 if (!can_init_parents && !super_class->IsInitialized()) { 3673 return false; 3674 } else { 3675 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3676 return false; 3677 } 3678 } 3679 } 3680 return true; 3681} 3682 3683bool ClassLinker::IsInitialized() const { 3684 return init_done_; 3685} 3686 3687bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3688 bool can_init_parents) { 3689 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3690 3691 // Are we already initialized and therefore done? 3692 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3693 // an initialized class will never change its state. 3694 if (klass->IsInitialized()) { 3695 return true; 3696 } 3697 3698 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3699 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3700 return false; 3701 } 3702 3703 Thread* self = Thread::Current(); 3704 uint64_t t0; 3705 { 3706 ObjectLock<mirror::Class> lock(self, klass); 3707 3708 // Re-check under the lock in case another thread initialized ahead of us. 3709 if (klass->IsInitialized()) { 3710 return true; 3711 } 3712 3713 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3714 if (klass->IsErroneous()) { 3715 ThrowEarlierClassFailure(klass.Get()); 3716 return false; 3717 } 3718 3719 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3720 3721 if (!klass->IsVerified()) { 3722 VerifyClass(klass); 3723 if (!klass->IsVerified()) { 3724 // We failed to verify, expect either the klass to be erroneous or verification failed at 3725 // compile time. 3726 if (klass->IsErroneous()) { 3727 CHECK(self->IsExceptionPending()); 3728 } else { 3729 CHECK(Runtime::Current()->IsCompiler()); 3730 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3731 } 3732 return false; 3733 } 3734 } 3735 3736 // If the class is kStatusInitializing, either this thread is 3737 // initializing higher up the stack or another thread has beat us 3738 // to initializing and we need to wait. Either way, this 3739 // invocation of InitializeClass will not be responsible for 3740 // running <clinit> and will return. 3741 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3742 // We caught somebody else in the act; was it us? 3743 if (klass->GetClinitThreadId() == self->GetTid()) { 3744 // Yes. That's fine. Return so we can continue initializing. 3745 return true; 3746 } 3747 // No. That's fine. Wait for another thread to finish initializing. 3748 return WaitForInitializeClass(klass, self, lock); 3749 } 3750 3751 if (!ValidateSuperClassDescriptors(klass)) { 3752 klass->SetStatus(mirror::Class::kStatusError, self); 3753 return false; 3754 } 3755 3756 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3757 3758 // From here out other threads may observe that we're initializing and so changes of state 3759 // require the a notification. 3760 klass->SetClinitThreadId(self->GetTid()); 3761 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3762 3763 t0 = NanoTime(); 3764 } 3765 3766 // Initialize super classes, must be done while initializing for the JLS. 3767 if (!klass->IsInterface() && klass->HasSuperClass()) { 3768 mirror::Class* super_class = klass->GetSuperClass(); 3769 if (!super_class->IsInitialized()) { 3770 CHECK(!super_class->IsInterface()); 3771 CHECK(can_init_parents); 3772 StackHandleScope<1> hs(self); 3773 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3774 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3775 if (!super_initialized) { 3776 // The super class was verified ahead of entering initializing, we should only be here if 3777 // the super class became erroneous due to initialization. 3778 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3779 << "Super class initialization failed for " 3780 << PrettyDescriptor(handle_scope_super.Get()) 3781 << " that has unexpected status " << handle_scope_super->GetStatus() 3782 << "\nPending exception:\n" 3783 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3784 ObjectLock<mirror::Class> lock(self, klass); 3785 // Initialization failed because the super-class is erroneous. 3786 klass->SetStatus(mirror::Class::kStatusError, self); 3787 return false; 3788 } 3789 } 3790 } 3791 3792 if (klass->NumStaticFields() > 0) { 3793 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3794 CHECK(dex_class_def != NULL); 3795 const DexFile& dex_file = klass->GetDexFile(); 3796 StackHandleScope<2> hs(self); 3797 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3798 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3799 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3800 this, *dex_class_def); 3801 if (it.HasNext()) { 3802 CHECK(can_init_statics); 3803 // We reordered the fields, so we need to be able to map the 3804 // field indexes to the right fields. 3805 SafeMap<uint32_t, mirror::ArtField*> field_map; 3806 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3807 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3808 if (Runtime::Current()->IsActiveTransaction()) { 3809 it.ReadValueToField<true>(field_map.Get(i)); 3810 } else { 3811 it.ReadValueToField<false>(field_map.Get(i)); 3812 } 3813 } 3814 } 3815 } 3816 3817 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3818 if (clinit != NULL) { 3819 CHECK(can_init_statics); 3820 JValue result; 3821 clinit->Invoke(self, NULL, 0, &result, "V"); 3822 } 3823 3824 uint64_t t1 = NanoTime(); 3825 3826 bool success = true; 3827 { 3828 ObjectLock<mirror::Class> lock(self, klass); 3829 3830 if (self->IsExceptionPending()) { 3831 WrapExceptionInInitializer(); 3832 klass->SetStatus(mirror::Class::kStatusError, self); 3833 success = false; 3834 } else { 3835 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3836 RuntimeStats* thread_stats = self->GetStats(); 3837 ++global_stats->class_init_count; 3838 ++thread_stats->class_init_count; 3839 global_stats->class_init_time_ns += (t1 - t0); 3840 thread_stats->class_init_time_ns += (t1 - t0); 3841 // Set the class as initialized except if failed to initialize static fields. 3842 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3843 if (VLOG_IS_ON(class_linker)) { 3844 std::string temp; 3845 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " << 3846 klass->GetLocation(); 3847 } 3848 // Opportunistically set static method trampolines to their destination. 3849 FixupStaticTrampolines(klass.Get()); 3850 } 3851 } 3852 return success; 3853} 3854 3855bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3856 ObjectLock<mirror::Class>& lock) 3857 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3858 while (true) { 3859 self->AssertNoPendingException(); 3860 CHECK(!klass->IsInitialized()); 3861 lock.WaitIgnoringInterrupts(); 3862 3863 // When we wake up, repeat the test for init-in-progress. If 3864 // there's an exception pending (only possible if 3865 // "interruptShouldThrow" was set), bail out. 3866 if (self->IsExceptionPending()) { 3867 WrapExceptionInInitializer(); 3868 klass->SetStatus(mirror::Class::kStatusError, self); 3869 return false; 3870 } 3871 // Spurious wakeup? Go back to waiting. 3872 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3873 continue; 3874 } 3875 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3876 // Compile time initialization failed. 3877 return false; 3878 } 3879 if (klass->IsErroneous()) { 3880 // The caller wants an exception, but it was thrown in a 3881 // different thread. Synthesize one here. 3882 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3883 PrettyDescriptor(klass.Get()).c_str()); 3884 return false; 3885 } 3886 if (klass->IsInitialized()) { 3887 return true; 3888 } 3889 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 3890 << klass->GetStatus(); 3891 } 3892 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 3893} 3894 3895bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 3896 if (klass->IsInterface()) { 3897 return true; 3898 } 3899 // Begin with the methods local to the superclass. 3900 StackHandleScope<2> hs(Thread::Current()); 3901 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3902 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3903 if (klass->HasSuperClass() && 3904 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3905 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) { 3906 mh.ChangeMethod(klass->GetVTableEntry(i)); 3907 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTableEntry(i)); 3908 if (mh.GetMethod() != super_mh.GetMethod() && 3909 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3910 ThrowLinkageError(klass.Get(), 3911 "Class %s method %s resolves differently in superclass %s", 3912 PrettyDescriptor(klass.Get()).c_str(), 3913 PrettyMethod(mh.GetMethod()).c_str(), 3914 PrettyDescriptor(klass->GetSuperClass()).c_str()); 3915 return false; 3916 } 3917 } 3918 } 3919 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3920 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 3921 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 3922 for (uint32_t j = 0; j < num_methods; ++j) { 3923 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 3924 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 3925 if (mh.GetMethod() != super_mh.GetMethod() && 3926 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3927 ThrowLinkageError(klass.Get(), 3928 "Class %s method %s resolves differently in interface %s", 3929 PrettyDescriptor(klass.Get()).c_str(), 3930 PrettyMethod(mh.GetMethod()).c_str(), 3931 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 3932 return false; 3933 } 3934 } 3935 } 3936 } 3937 return true; 3938} 3939 3940bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 3941 bool can_init_parents) { 3942 DCHECK(c.Get() != nullptr); 3943 const bool success = c->IsInitialized() || InitializeClass(c, can_init_fields, can_init_parents); 3944 if (!success && can_init_fields && can_init_parents) { 3945 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.Get()); 3946 } 3947 return success; 3948} 3949 3950void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3951 mirror::Class* c, 3952 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3953 const byte* class_data = dex_file.GetClassData(dex_class_def); 3954 ClassDataItemIterator it(dex_file, class_data); 3955 StackHandleScope<2> hs(Thread::Current()); 3956 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 3957 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 3958 CHECK(!kMovingFields); 3959 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3960 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3961 } 3962} 3963 3964void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class) { 3965 mirror::ObjectArray<mirror::ArtField>* fields = new_class->GetIFields(); 3966 if (fields != nullptr) { 3967 for (int index = 0; index < fields->GetLength(); index ++) { 3968 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 3969 fields->Get(index)->SetDeclaringClass(new_class); 3970 } 3971 } 3972 } 3973 3974 fields = new_class->GetSFields(); 3975 if (fields != nullptr) { 3976 for (int index = 0; index < fields->GetLength(); index ++) { 3977 if (fields->Get(index)->GetDeclaringClass() == temp_class) { 3978 fields->Get(index)->SetDeclaringClass(new_class); 3979 } 3980 } 3981 } 3982 3983 mirror::ObjectArray<mirror::ArtMethod>* methods = new_class->GetDirectMethods(); 3984 if (methods != nullptr) { 3985 for (int index = 0; index < methods->GetLength(); index ++) { 3986 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 3987 methods->Get(index)->SetDeclaringClass(new_class); 3988 } 3989 } 3990 } 3991 3992 methods = new_class->GetVirtualMethods(); 3993 if (methods != nullptr) { 3994 for (int index = 0; index < methods->GetLength(); index ++) { 3995 if (methods->Get(index)->GetDeclaringClass() == temp_class) { 3996 methods->Get(index)->SetDeclaringClass(new_class); 3997 } 3998 } 3999 } 4000} 4001 4002bool ClassLinker::LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass, 4003 Handle<mirror::ObjectArray<mirror::Class>> interfaces, 4004 mirror::Class** new_class) { 4005 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4006 4007 if (!LinkSuperClass(klass)) { 4008 return false; 4009 } 4010 if (!LinkMethods(self, klass, interfaces)) { 4011 return false; 4012 } 4013 if (!LinkInstanceFields(klass)) { 4014 return false; 4015 } 4016 size_t class_size; 4017 if (!LinkStaticFields(klass, &class_size)) { 4018 return false; 4019 } 4020 CreateReferenceInstanceOffsets(klass); 4021 CreateReferenceStaticOffsets(klass); 4022 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 4023 4024 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) { 4025 // We don't need to retire this class as it has no embedded tables or it was created the 4026 // correct size during class linker initialization. 4027 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get()); 4028 4029 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4030 klass->PopulateEmbeddedImtAndVTable(); 4031 } 4032 4033 // This will notify waiters on klass that saw the not yet resolved 4034 // class in the class_table_ during EnsureResolved. 4035 klass->SetStatus(mirror::Class::kStatusResolved, self); 4036 *new_class = klass.Get(); 4037 } else { 4038 CHECK(!klass->IsResolved()); 4039 // Retire the temporary class and create the correctly sized resolved class. 4040 *new_class = klass->CopyOf(self, class_size); 4041 if (UNLIKELY(*new_class == NULL)) { 4042 CHECK(self->IsExceptionPending()); // Expect an OOME. 4043 klass->SetStatus(mirror::Class::kStatusError, self); 4044 return false; 4045 } 4046 4047 CHECK_EQ((*new_class)->GetClassSize(), class_size); 4048 StackHandleScope<1> hs(self); 4049 auto new_class_h = hs.NewHandleWrapper<mirror::Class>(new_class); 4050 ObjectLock<mirror::Class> lock(self, new_class_h); 4051 4052 FixupTemporaryDeclaringClass(klass.Get(), new_class_h.Get()); 4053 4054 mirror::Class* existing = UpdateClass(descriptor, new_class_h.Get(), Hash(descriptor)); 4055 CHECK(existing == NULL || existing == klass.Get()); 4056 4057 // This will notify waiters on temp class that saw the not yet resolved class in the 4058 // class_table_ during EnsureResolved. 4059 klass->SetStatus(mirror::Class::kStatusRetired, self); 4060 4061 CHECK_EQ(new_class_h->GetStatus(), mirror::Class::kStatusResolving); 4062 // This will notify waiters on new_class that saw the not yet resolved 4063 // class in the class_table_ during EnsureResolved. 4064 new_class_h->SetStatus(mirror::Class::kStatusResolved, self); 4065 } 4066 return true; 4067} 4068 4069bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 4070 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 4071 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 4072 uint16_t super_class_idx = class_def.superclass_idx_; 4073 if (super_class_idx != DexFile::kDexNoIndex16) { 4074 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 4075 if (super_class == NULL) { 4076 DCHECK(Thread::Current()->IsExceptionPending()); 4077 return false; 4078 } 4079 // Verify 4080 if (!klass->CanAccess(super_class)) { 4081 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 4082 PrettyDescriptor(super_class).c_str(), 4083 PrettyDescriptor(klass.Get()).c_str()); 4084 return false; 4085 } 4086 CHECK(super_class->IsResolved()); 4087 klass->SetSuperClass(super_class); 4088 } 4089 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 4090 if (interfaces != NULL) { 4091 for (size_t i = 0; i < interfaces->Size(); i++) { 4092 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 4093 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 4094 if (interface == NULL) { 4095 DCHECK(Thread::Current()->IsExceptionPending()); 4096 return false; 4097 } 4098 // Verify 4099 if (!klass->CanAccess(interface)) { 4100 // TODO: the RI seemed to ignore this in my testing. 4101 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 4102 PrettyDescriptor(interface).c_str(), 4103 PrettyDescriptor(klass.Get()).c_str()); 4104 return false; 4105 } 4106 } 4107 } 4108 // Mark the class as loaded. 4109 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 4110 return true; 4111} 4112 4113bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 4114 CHECK(!klass->IsPrimitive()); 4115 mirror::Class* super = klass->GetSuperClass(); 4116 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 4117 if (super != NULL) { 4118 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 4119 return false; 4120 } 4121 return true; 4122 } 4123 if (super == NULL) { 4124 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 4125 PrettyDescriptor(klass.Get()).c_str()); 4126 return false; 4127 } 4128 // Verify 4129 if (super->IsFinal() || super->IsInterface()) { 4130 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 4131 PrettyDescriptor(super).c_str(), 4132 PrettyDescriptor(klass.Get()).c_str(), 4133 super->IsFinal() ? "declared final" : "an interface"); 4134 return false; 4135 } 4136 if (!klass->CanAccess(super)) { 4137 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 4138 PrettyDescriptor(super).c_str(), 4139 PrettyDescriptor(klass.Get()).c_str()); 4140 return false; 4141 } 4142 4143 // Inherit kAccClassIsFinalizable from the superclass in case this 4144 // class doesn't override finalize. 4145 if (super->IsFinalizable()) { 4146 klass->SetFinalizable(); 4147 } 4148 4149 // Inherit reference flags (if any) from the superclass. 4150 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 4151 if (reference_flags != 0) { 4152 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 4153 } 4154 // Disallow custom direct subclasses of java.lang.ref.Reference. 4155 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 4156 ThrowLinkageError(klass.Get(), 4157 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 4158 PrettyDescriptor(klass.Get()).c_str()); 4159 return false; 4160 } 4161 4162 if (kIsDebugBuild) { 4163 // Ensure super classes are fully resolved prior to resolving fields.. 4164 while (super != NULL) { 4165 CHECK(super->IsResolved()); 4166 super = super->GetSuperClass(); 4167 } 4168 } 4169 return true; 4170} 4171 4172// Populate the class vtable and itable. Compute return type indices. 4173bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 4174 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4175 if (klass->IsInterface()) { 4176 // No vtable. 4177 size_t count = klass->NumVirtualMethods(); 4178 if (!IsUint(16, count)) { 4179 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 4180 return false; 4181 } 4182 for (size_t i = 0; i < count; ++i) { 4183 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 4184 } 4185 // Link interface method tables 4186 return LinkInterfaceMethods(klass, interfaces); 4187 } else { 4188 // Link virtual and interface method tables 4189 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 4190 } 4191 return true; 4192} 4193 4194bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 4195 if (klass->HasSuperClass()) { 4196 uint32_t max_count = klass->NumVirtualMethods() + 4197 klass->GetSuperClass()->GetVTableLength(); 4198 size_t actual_count = klass->GetSuperClass()->GetVTableLength(); 4199 CHECK_LE(actual_count, max_count); 4200 StackHandleScope<4> hs(self); 4201 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass())); 4202 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable; 4203 if (super_class->ShouldHaveEmbeddedImtAndVTable()) { 4204 vtable = hs.NewHandle(AllocArtMethodArray(self, max_count)); 4205 if (UNLIKELY(vtable.Get() == nullptr)) { 4206 CHECK(self->IsExceptionPending()); // OOME. 4207 return false; 4208 } 4209 int len = super_class->GetVTableLength(); 4210 for (int i = 0; i < len; i++) { 4211 vtable->Set<false>(i, super_class->GetVTableEntry(i)); 4212 } 4213 } else { 4214 CHECK(super_class->GetVTable() != nullptr) << PrettyClass(super_class.Get()); 4215 vtable = hs.NewHandle(super_class->GetVTable()->CopyOf(self, max_count)); 4216 if (UNLIKELY(vtable.Get() == nullptr)) { 4217 CHECK(self->IsExceptionPending()); // OOME. 4218 return false; 4219 } 4220 } 4221 4222 // See if any of our virtual methods override the superclass. 4223 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4224 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4225 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 4226 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 4227 local_mh.ChangeMethod(local_method); 4228 size_t j = 0; 4229 for (; j < actual_count; ++j) { 4230 mirror::ArtMethod* super_method = vtable->Get(j); 4231 super_mh.ChangeMethod(super_method); 4232 if (local_mh.HasSameNameAndSignature(&super_mh)) { 4233 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 4234 super_method->GetAccessFlags())) { 4235 if (super_method->IsFinal()) { 4236 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 4237 PrettyMethod(local_method).c_str(), 4238 super_method->GetDeclaringClassDescriptor()); 4239 return false; 4240 } 4241 vtable->Set<false>(j, local_method); 4242 local_method->SetMethodIndex(j); 4243 break; 4244 } else { 4245 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 4246 << " would have incorrectly overridden the package-private method in " 4247 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 4248 } 4249 } 4250 } 4251 if (j == actual_count) { 4252 // Not overriding, append. 4253 vtable->Set<false>(actual_count, local_method); 4254 local_method->SetMethodIndex(actual_count); 4255 actual_count += 1; 4256 } 4257 } 4258 if (!IsUint(16, actual_count)) { 4259 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 4260 return false; 4261 } 4262 // Shrink vtable if possible 4263 CHECK_LE(actual_count, max_count); 4264 if (actual_count < max_count) { 4265 vtable.Assign(vtable->CopyOf(self, actual_count)); 4266 if (UNLIKELY(vtable.Get() == NULL)) { 4267 CHECK(self->IsExceptionPending()); // OOME. 4268 return false; 4269 } 4270 } 4271 klass->SetVTable(vtable.Get()); 4272 } else { 4273 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 4274 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 4275 if (!IsUint(16, num_virtual_methods)) { 4276 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 4277 return false; 4278 } 4279 StackHandleScope<1> hs(self); 4280 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4281 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 4282 if (UNLIKELY(vtable.Get() == NULL)) { 4283 CHECK(self->IsExceptionPending()); // OOME. 4284 return false; 4285 } 4286 for (size_t i = 0; i < num_virtual_methods; ++i) { 4287 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 4288 vtable->Set<false>(i, virtual_method); 4289 virtual_method->SetMethodIndex(i & 0xFFFF); 4290 } 4291 klass->SetVTable(vtable.Get()); 4292 } 4293 return true; 4294} 4295 4296bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 4297 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 4298 Thread* const self = Thread::Current(); 4299 Runtime* const runtime = Runtime::Current(); 4300 // Set the imt table to be all conflicts by default. 4301 klass->SetImTable(runtime->GetDefaultImt()); 4302 size_t super_ifcount; 4303 if (klass->HasSuperClass()) { 4304 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 4305 } else { 4306 super_ifcount = 0; 4307 } 4308 uint32_t num_interfaces = 4309 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 4310 size_t ifcount = super_ifcount + num_interfaces; 4311 for (size_t i = 0; i < num_interfaces; i++) { 4312 mirror::Class* interface = 4313 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4314 interfaces->Get(i); 4315 ifcount += interface->GetIfTableCount(); 4316 } 4317 if (ifcount == 0) { 4318 // Class implements no interfaces. 4319 DCHECK_EQ(klass->GetIfTableCount(), 0); 4320 DCHECK(klass->GetIfTable() == NULL); 4321 return true; 4322 } 4323 if (ifcount == super_ifcount) { 4324 // Class implements same interfaces as parent, are any of these not marker interfaces? 4325 bool has_non_marker_interface = false; 4326 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4327 for (size_t i = 0; i < ifcount; ++i) { 4328 if (super_iftable->GetMethodArrayCount(i) > 0) { 4329 has_non_marker_interface = true; 4330 break; 4331 } 4332 } 4333 if (!has_non_marker_interface) { 4334 // Class just inherits marker interfaces from parent so recycle parent's iftable. 4335 klass->SetIfTable(super_iftable); 4336 return true; 4337 } 4338 } 4339 StackHandleScope<4> hs(self); 4340 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 4341 if (UNLIKELY(iftable.Get() == NULL)) { 4342 CHECK(self->IsExceptionPending()); // OOME. 4343 return false; 4344 } 4345 if (super_ifcount != 0) { 4346 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 4347 for (size_t i = 0; i < super_ifcount; i++) { 4348 mirror::Class* super_interface = super_iftable->GetInterface(i); 4349 iftable->SetInterface(i, super_interface); 4350 } 4351 } 4352 // Flatten the interface inheritance hierarchy. 4353 size_t idx = super_ifcount; 4354 for (size_t i = 0; i < num_interfaces; i++) { 4355 mirror::Class* interface = 4356 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 4357 interfaces->Get(i); 4358 DCHECK(interface != NULL); 4359 if (!interface->IsInterface()) { 4360 std::string temp; 4361 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 4362 PrettyDescriptor(klass.Get()).c_str(), 4363 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str()); 4364 return false; 4365 } 4366 // Check if interface is already in iftable 4367 bool duplicate = false; 4368 for (size_t j = 0; j < idx; j++) { 4369 mirror::Class* existing_interface = iftable->GetInterface(j); 4370 if (existing_interface == interface) { 4371 duplicate = true; 4372 break; 4373 } 4374 } 4375 if (!duplicate) { 4376 // Add this non-duplicate interface. 4377 iftable->SetInterface(idx++, interface); 4378 // Add this interface's non-duplicate super-interfaces. 4379 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 4380 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 4381 bool super_duplicate = false; 4382 for (size_t k = 0; k < idx; k++) { 4383 mirror::Class* existing_interface = iftable->GetInterface(k); 4384 if (existing_interface == super_interface) { 4385 super_duplicate = true; 4386 break; 4387 } 4388 } 4389 if (!super_duplicate) { 4390 iftable->SetInterface(idx++, super_interface); 4391 } 4392 } 4393 } 4394 } 4395 // Shrink iftable in case duplicates were found 4396 if (idx < ifcount) { 4397 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 4398 if (UNLIKELY(iftable.Get() == NULL)) { 4399 CHECK(self->IsExceptionPending()); // OOME. 4400 return false; 4401 } 4402 ifcount = idx; 4403 } else { 4404 CHECK_EQ(idx, ifcount); 4405 } 4406 klass->SetIfTable(iftable.Get()); 4407 4408 // If we're an interface, we don't need the vtable pointers, so we're done. 4409 if (klass->IsInterface()) { 4410 return true; 4411 } 4412 // Allocate imtable 4413 bool imtable_changed = false; 4414 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 4415 hs.NewHandle(AllocArtMethodArray(self, mirror::Class::kImtSize))); 4416 if (UNLIKELY(imtable.Get() == NULL)) { 4417 CHECK(self->IsExceptionPending()); // OOME. 4418 return false; 4419 } 4420 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4421 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 4422 std::vector<mirror::ArtMethod*> miranda_list; 4423 for (size_t i = 0; i < ifcount; ++i) { 4424 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 4425 if (num_methods > 0) { 4426 StackHandleScope<2> hs(self); 4427 Handle<mirror::ObjectArray<mirror::ArtMethod>> 4428 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 4429 if (UNLIKELY(method_array.Get() == nullptr)) { 4430 CHECK(self->IsExceptionPending()); // OOME. 4431 return false; 4432 } 4433 iftable->SetMethodArray(i, method_array.Get()); 4434 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4435 hs.NewHandle(klass->GetVTableDuringLinking())); 4436 for (size_t j = 0; j < num_methods; ++j) { 4437 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 4438 interface_mh.ChangeMethod(interface_method); 4439 int32_t k; 4440 // For each method listed in the interface's method list, find the 4441 // matching method in our class's method list. We want to favor the 4442 // subclass over the superclass, which just requires walking 4443 // back from the end of the vtable. (This only matters if the 4444 // superclass defines a private method and this class redefines 4445 // it -- otherwise it would use the same vtable slot. In .dex files 4446 // those don't end up in the virtual method table, so it shouldn't 4447 // matter which direction we go. We walk it backward anyway.) 4448 for (k = vtable->GetLength() - 1; k >= 0; --k) { 4449 mirror::ArtMethod* vtable_method = vtable->Get(k); 4450 vtable_mh.ChangeMethod(vtable_method); 4451 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4452 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 4453 ThrowIllegalAccessError( 4454 klass.Get(), 4455 "Method '%s' implementing interface method '%s' is not public", 4456 PrettyMethod(vtable_method).c_str(), 4457 PrettyMethod(interface_method).c_str()); 4458 return false; 4459 } 4460 method_array->Set<false>(j, vtable_method); 4461 // Place method in imt if entry is empty, place conflict otherwise. 4462 uint32_t imt_index = interface_method->GetDexMethodIndex() % mirror::Class::kImtSize; 4463 if (imtable->Get(imt_index) == NULL) { 4464 imtable->Set<false>(imt_index, vtable_method); 4465 imtable_changed = true; 4466 } else { 4467 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 4468 } 4469 break; 4470 } 4471 } 4472 if (k < 0) { 4473 StackHandleScope<1> hs(self); 4474 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 4475 for (mirror::ArtMethod* mir_method : miranda_list) { 4476 vtable_mh.ChangeMethod(mir_method); 4477 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 4478 miranda_method.Assign(mir_method); 4479 break; 4480 } 4481 } 4482 if (miranda_method.Get() == NULL) { 4483 // Point the interface table at a phantom slot. 4484 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 4485 if (UNLIKELY(miranda_method.Get() == NULL)) { 4486 CHECK(self->IsExceptionPending()); // OOME. 4487 return false; 4488 } 4489 // TODO: If a methods move then the miranda_list may hold stale references. 4490 miranda_list.push_back(miranda_method.Get()); 4491 } 4492 method_array->Set<false>(j, miranda_method.Get()); 4493 } 4494 } 4495 } 4496 } 4497 if (imtable_changed) { 4498 // Fill in empty entries in interface method table with conflict. 4499 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 4500 for (size_t i = 0; i < mirror::Class::kImtSize; i++) { 4501 if (imtable->Get(i) == NULL) { 4502 imtable->Set<false>(i, imt_conflict_method); 4503 } 4504 } 4505 klass->SetImTable(imtable.Get()); 4506 } 4507 if (!miranda_list.empty()) { 4508 int old_method_count = klass->NumVirtualMethods(); 4509 int new_method_count = old_method_count + miranda_list.size(); 4510 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 4511 if (old_method_count == 0) { 4512 virtuals = AllocArtMethodArray(self, new_method_count); 4513 } else { 4514 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 4515 } 4516 if (UNLIKELY(virtuals == NULL)) { 4517 CHECK(self->IsExceptionPending()); // OOME. 4518 return false; 4519 } 4520 klass->SetVirtualMethods(virtuals); 4521 4522 StackHandleScope<1> hs(self); 4523 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 4524 hs.NewHandle(klass->GetVTableDuringLinking())); 4525 CHECK(vtable.Get() != NULL); 4526 int old_vtable_count = vtable->GetLength(); 4527 int new_vtable_count = old_vtable_count + miranda_list.size(); 4528 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 4529 if (UNLIKELY(vtable.Get() == NULL)) { 4530 CHECK(self->IsExceptionPending()); // OOME. 4531 return false; 4532 } 4533 for (size_t i = 0; i < miranda_list.size(); ++i) { 4534 mirror::ArtMethod* method = miranda_list[i]; 4535 // Leave the declaring class alone as type indices are relative to it 4536 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4537 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4538 klass->SetVirtualMethod(old_method_count + i, method); 4539 vtable->Set<false>(old_vtable_count + i, method); 4540 } 4541 // TODO: do not assign to the vtable field until it is fully constructed. 4542 klass->SetVTable(vtable.Get()); 4543 } 4544 4545 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4546 for (int i = 0; i < vtable->GetLength(); ++i) { 4547 CHECK(vtable->Get(i) != NULL); 4548 } 4549 4550// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4551 4552 return true; 4553} 4554 4555bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4556 CHECK(klass.Get() != NULL); 4557 return LinkFields(klass, false, nullptr); 4558} 4559 4560bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass, size_t* class_size) { 4561 CHECK(klass.Get() != NULL); 4562 return LinkFields(klass, true, class_size); 4563} 4564 4565struct LinkFieldsComparator { 4566 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4567 } 4568 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4569 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4570 NO_THREAD_SAFETY_ANALYSIS { 4571 // First come reference fields, then 64-bit, and finally 32-bit 4572 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4573 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4574 if (type1 != type2) { 4575 bool is_primitive1 = type1 != Primitive::kPrimNot; 4576 bool is_primitive2 = type2 != Primitive::kPrimNot; 4577 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4578 type1 == Primitive::kPrimDouble); 4579 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4580 type2 == Primitive::kPrimDouble); 4581 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4582 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4583 if (order1 != order2) { 4584 return order1 < order2; 4585 } 4586 } 4587 // same basic group? then sort by string. 4588 return strcmp(field1->GetName(), field2->GetName()) < 0; 4589 } 4590}; 4591 4592bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static, size_t* class_size) { 4593 size_t num_fields = 4594 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4595 4596 mirror::ObjectArray<mirror::ArtField>* fields = 4597 is_static ? klass->GetSFields() : klass->GetIFields(); 4598 4599 // Initialize field_offset 4600 MemberOffset field_offset(0); 4601 if (is_static) { 4602 uint32_t base = sizeof(mirror::Class); // Static fields come after the class. 4603 if (klass->ShouldHaveEmbeddedImtAndVTable()) { 4604 // Static fields come after the embedded tables. 4605 base = mirror::Class::ComputeClassSize(true, klass->GetVTableDuringLinking()->GetLength(), 4606 0, 0, 0); 4607 } 4608 field_offset = MemberOffset(base); 4609 } else { 4610 mirror::Class* super_class = klass->GetSuperClass(); 4611 if (super_class != NULL) { 4612 CHECK(super_class->IsResolved()) 4613 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4614 field_offset = MemberOffset(super_class->GetObjectSize()); 4615 } 4616 } 4617 4618 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4619 4620 // we want a relatively stable order so that adding new fields 4621 // minimizes disruption of C++ version such as Class and Method. 4622 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4623 for (size_t i = 0; i < num_fields; i++) { 4624 mirror::ArtField* f = fields->Get(i); 4625 CHECK(f != NULL) << PrettyClass(klass.Get()); 4626 grouped_and_sorted_fields.push_back(f); 4627 } 4628 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4629 LinkFieldsComparator()); 4630 4631 // References should be at the front. 4632 size_t current_field = 0; 4633 size_t num_reference_fields = 0; 4634 for (; current_field < num_fields; current_field++) { 4635 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4636 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4637 bool isPrimitive = type != Primitive::kPrimNot; 4638 if (isPrimitive) { 4639 break; // past last reference, move on to the next phase 4640 } 4641 grouped_and_sorted_fields.pop_front(); 4642 num_reference_fields++; 4643 fields->Set<false>(current_field, field); 4644 field->SetOffset(field_offset); 4645 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4646 } 4647 4648 // Now we want to pack all of the double-wide fields together. If 4649 // we're not aligned, though, we want to shuffle one 32-bit field 4650 // into place. If we can't find one, we'll have to pad it. 4651 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4652 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4653 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4654 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4655 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4656 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4657 continue; 4658 } 4659 fields->Set<false>(current_field++, field); 4660 field->SetOffset(field_offset); 4661 // drop the consumed field 4662 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4663 break; 4664 } 4665 // whether we found a 32-bit field for padding or not, we advance 4666 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4667 } 4668 4669 // Alignment is good, shuffle any double-wide fields forward, and 4670 // finish assigning field offsets to all fields. 4671 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 4672 << PrettyClass(klass.Get()); 4673 while (!grouped_and_sorted_fields.empty()) { 4674 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4675 grouped_and_sorted_fields.pop_front(); 4676 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4677 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4678 fields->Set<false>(current_field, field); 4679 field->SetOffset(field_offset); 4680 field_offset = MemberOffset(field_offset.Uint32Value() + 4681 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4682 ? sizeof(uint64_t) 4683 : sizeof(uint32_t))); 4684 current_field++; 4685 } 4686 4687 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4688 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4689 // We know there are no non-reference fields in the Reference classes, and we know 4690 // that 'referent' is alphabetically last, so this is easy... 4691 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4692 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4693 --num_reference_fields; 4694 } 4695 4696 if (kIsDebugBuild) { 4697 // Make sure that all reference fields appear before 4698 // non-reference fields, and all double-wide fields are aligned. 4699 bool seen_non_ref = false; 4700 for (size_t i = 0; i < num_fields; i++) { 4701 mirror::ArtField* field = fields->Get(i); 4702 if (false) { // enable to debug field layout 4703 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4704 << " class=" << PrettyClass(klass.Get()) 4705 << " field=" << PrettyField(field) 4706 << " offset=" 4707 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4708 } 4709 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4710 bool is_primitive = type != Primitive::kPrimNot; 4711 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4712 strcmp("referent", field->GetName()) == 0) { 4713 is_primitive = true; // We lied above, so we have to expect a lie here. 4714 } 4715 if (is_primitive) { 4716 if (!seen_non_ref) { 4717 seen_non_ref = true; 4718 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4719 } 4720 } else { 4721 DCHECK(!seen_non_ref) << PrettyField(field); 4722 } 4723 } 4724 if (!seen_non_ref) { 4725 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4726 } 4727 } 4728 4729 size_t size = field_offset.Uint32Value(); 4730 // Update klass 4731 if (is_static) { 4732 klass->SetNumReferenceStaticFields(num_reference_fields); 4733 *class_size = size; 4734 } else { 4735 klass->SetNumReferenceInstanceFields(num_reference_fields); 4736 if (!klass->IsVariableSize()) { 4737 std::string temp; 4738 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp); 4739 size_t previous_size = klass->GetObjectSize(); 4740 if (previous_size != 0) { 4741 // Make sure that we didn't originally have an incorrect size. 4742 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp); 4743 } 4744 klass->SetObjectSize(size); 4745 } 4746 } 4747 return true; 4748} 4749 4750// Set the bitmap of reference offsets, refOffsets, from the ifields 4751// list. 4752void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4753 uint32_t reference_offsets = 0; 4754 mirror::Class* super_class = klass->GetSuperClass(); 4755 if (super_class != NULL) { 4756 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4757 // If our superclass overflowed, we don't stand a chance. 4758 if (reference_offsets == CLASS_WALK_SUPER) { 4759 klass->SetReferenceInstanceOffsets(reference_offsets); 4760 return; 4761 } 4762 } 4763 CreateReferenceOffsets(klass, false, reference_offsets); 4764} 4765 4766void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4767 CreateReferenceOffsets(klass, true, 0); 4768} 4769 4770void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4771 uint32_t reference_offsets) { 4772 size_t num_reference_fields = 4773 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4774 : klass->NumReferenceInstanceFieldsDuringLinking(); 4775 mirror::ObjectArray<mirror::ArtField>* fields = 4776 is_static ? klass->GetSFields() : klass->GetIFields(); 4777 // All of the fields that contain object references are guaranteed 4778 // to be at the beginning of the fields list. 4779 for (size_t i = 0; i < num_reference_fields; ++i) { 4780 // Note that byte_offset is the offset from the beginning of 4781 // object, not the offset into instance data 4782 mirror::ArtField* field = fields->Get(i); 4783 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4784 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4785 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4786 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4787 CHECK_NE(new_bit, 0U); 4788 reference_offsets |= new_bit; 4789 } else { 4790 reference_offsets = CLASS_WALK_SUPER; 4791 break; 4792 } 4793 } 4794 // Update fields in klass 4795 if (is_static) { 4796 klass->SetReferenceStaticOffsets(reference_offsets); 4797 } else { 4798 klass->SetReferenceInstanceOffsets(reference_offsets); 4799 } 4800} 4801 4802mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4803 Handle<mirror::DexCache> dex_cache) { 4804 DCHECK(dex_cache.Get() != nullptr); 4805 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4806 if (resolved != NULL) { 4807 return resolved; 4808 } 4809 uint32_t utf16_length; 4810 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4811 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4812 dex_cache->SetResolvedString(string_idx, string); 4813 return string; 4814} 4815 4816mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4817 mirror::Class* referrer) { 4818 StackHandleScope<2> hs(Thread::Current()); 4819 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4820 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4821 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4822} 4823 4824mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4825 Handle<mirror::DexCache> dex_cache, 4826 Handle<mirror::ClassLoader> class_loader) { 4827 DCHECK(dex_cache.Get() != NULL); 4828 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4829 if (resolved == NULL) { 4830 Thread* self = Thread::Current(); 4831 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4832 resolved = FindClass(self, descriptor, class_loader); 4833 if (resolved != NULL) { 4834 // TODO: we used to throw here if resolved's class loader was not the 4835 // boot class loader. This was to permit different classes with the 4836 // same name to be loaded simultaneously by different loaders 4837 dex_cache->SetResolvedType(type_idx, resolved); 4838 } else { 4839 CHECK(self->IsExceptionPending()) 4840 << "Expected pending exception for failed resolution of: " << descriptor; 4841 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4842 StackHandleScope<1> hs(self); 4843 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4844 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4845 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4846 self->ClearException(); 4847 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4848 self->GetException(NULL)->SetCause(cause.Get()); 4849 } 4850 } 4851 } 4852 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4853 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4854 return resolved; 4855} 4856 4857mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 4858 Handle<mirror::DexCache> dex_cache, 4859 Handle<mirror::ClassLoader> class_loader, 4860 Handle<mirror::ArtMethod> referrer, 4861 InvokeType type) { 4862 DCHECK(dex_cache.Get() != nullptr); 4863 // Check for hit in the dex cache. 4864 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4865 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 4866 return resolved; 4867 } 4868 // Fail, get the declaring class. 4869 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4870 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4871 if (klass == nullptr) { 4872 DCHECK(Thread::Current()->IsExceptionPending()); 4873 return nullptr; 4874 } 4875 // Scan using method_idx, this saves string compares but will only hit for matching dex 4876 // caches/files. 4877 switch (type) { 4878 case kDirect: // Fall-through. 4879 case kStatic: 4880 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 4881 break; 4882 case kInterface: 4883 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 4884 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 4885 break; 4886 case kSuper: // Fall-through. 4887 case kVirtual: 4888 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 4889 break; 4890 default: 4891 LOG(FATAL) << "Unreachable - invocation type: " << type; 4892 } 4893 if (resolved == nullptr) { 4894 // Search by name, which works across dex files. 4895 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4896 const Signature signature = dex_file.GetMethodSignature(method_id); 4897 switch (type) { 4898 case kDirect: // Fall-through. 4899 case kStatic: 4900 resolved = klass->FindDirectMethod(name, signature); 4901 break; 4902 case kInterface: 4903 resolved = klass->FindInterfaceMethod(name, signature); 4904 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface()); 4905 break; 4906 case kSuper: // Fall-through. 4907 case kVirtual: 4908 resolved = klass->FindVirtualMethod(name, signature); 4909 break; 4910 } 4911 } 4912 // If we found a method, check for incompatible class changes. 4913 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) { 4914 // Be a good citizen and update the dex cache to speed subsequent calls. 4915 dex_cache->SetResolvedMethod(method_idx, resolved); 4916 return resolved; 4917 } else { 4918 // If we had a method, it's an incompatible-class-change error. 4919 if (resolved != nullptr) { 4920 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer.Get()); 4921 } else { 4922 // We failed to find the method which means either an access error, an incompatible class 4923 // change, or no such method. First try to find the method among direct and virtual methods. 4924 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4925 const Signature signature = dex_file.GetMethodSignature(method_id); 4926 switch (type) { 4927 case kDirect: 4928 case kStatic: 4929 resolved = klass->FindVirtualMethod(name, signature); 4930 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would 4931 // have had a resolved method before, which triggers the "true" branch above. 4932 break; 4933 case kInterface: 4934 case kVirtual: 4935 case kSuper: 4936 resolved = klass->FindDirectMethod(name, signature); 4937 break; 4938 } 4939 4940 // If we found something, check that it can be accessed by the referrer. 4941 if (resolved != nullptr && referrer.Get() != nullptr) { 4942 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4943 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4944 if (!referring_class->CanAccess(methods_class)) { 4945 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4946 resolved, type); 4947 return nullptr; 4948 } else if (!referring_class->CanAccessMember(methods_class, 4949 resolved->GetAccessFlags())) { 4950 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4951 return nullptr; 4952 } 4953 } 4954 4955 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4956 // methods and throw if we find the method there. If we find nothing, throw a 4957 // NoSuchMethodError. 4958 switch (type) { 4959 case kDirect: 4960 case kStatic: 4961 if (resolved != nullptr) { 4962 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4963 } else { 4964 resolved = klass->FindInterfaceMethod(name, signature); 4965 if (resolved != nullptr) { 4966 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4967 } else { 4968 ThrowNoSuchMethodError(type, klass, name, signature); 4969 } 4970 } 4971 break; 4972 case kInterface: 4973 if (resolved != nullptr) { 4974 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4975 } else { 4976 resolved = klass->FindVirtualMethod(name, signature); 4977 if (resolved != nullptr) { 4978 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4979 } else { 4980 ThrowNoSuchMethodError(type, klass, name, signature); 4981 } 4982 } 4983 break; 4984 case kSuper: 4985 ThrowNoSuchMethodError(type, klass, name, signature); 4986 break; 4987 case kVirtual: 4988 if (resolved != nullptr) { 4989 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4990 } else { 4991 resolved = klass->FindInterfaceMethod(name, signature); 4992 if (resolved != nullptr) { 4993 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4994 } else { 4995 ThrowNoSuchMethodError(type, klass, name, signature); 4996 } 4997 } 4998 break; 4999 } 5000 } 5001 DCHECK(Thread::Current()->IsExceptionPending()); 5002 return nullptr; 5003 } 5004} 5005 5006mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 5007 Handle<mirror::DexCache> dex_cache, 5008 Handle<mirror::ClassLoader> class_loader, 5009 bool is_static) { 5010 DCHECK(dex_cache.Get() != nullptr); 5011 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5012 if (resolved != nullptr) { 5013 return resolved; 5014 } 5015 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5016 Thread* const self = Thread::Current(); 5017 StackHandleScope<1> hs(self); 5018 Handle<mirror::Class> klass( 5019 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5020 if (klass.Get() == nullptr) { 5021 DCHECK(Thread::Current()->IsExceptionPending()); 5022 return nullptr; 5023 } 5024 5025 if (is_static) { 5026 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 5027 } else { 5028 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 5029 } 5030 5031 if (resolved == nullptr) { 5032 const char* name = dex_file.GetFieldName(field_id); 5033 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 5034 if (is_static) { 5035 resolved = mirror::Class::FindStaticField(self, klass, name, type); 5036 } else { 5037 resolved = klass->FindInstanceField(name, type); 5038 } 5039 if (resolved == nullptr) { 5040 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 5041 return NULL; 5042 } 5043 } 5044 dex_cache->SetResolvedField(field_idx, resolved); 5045 return resolved; 5046} 5047 5048mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 5049 uint32_t field_idx, 5050 Handle<mirror::DexCache> dex_cache, 5051 Handle<mirror::ClassLoader> class_loader) { 5052 DCHECK(dex_cache.Get() != nullptr); 5053 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 5054 if (resolved != nullptr) { 5055 return resolved; 5056 } 5057 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 5058 Thread* self = Thread::Current(); 5059 StackHandleScope<1> hs(self); 5060 Handle<mirror::Class> klass( 5061 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 5062 if (klass.Get() == NULL) { 5063 DCHECK(Thread::Current()->IsExceptionPending()); 5064 return NULL; 5065 } 5066 5067 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 5068 StringPiece type(dex_file.StringDataByIdx( 5069 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 5070 resolved = mirror::Class::FindField(self, klass, name, type); 5071 if (resolved != NULL) { 5072 dex_cache->SetResolvedField(field_idx, resolved); 5073 } else { 5074 ThrowNoSuchFieldError("", klass.Get(), type, name); 5075 } 5076 return resolved; 5077} 5078 5079const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 5080 uint32_t* length) { 5081 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 5082 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 5083 const DexFile& dex_file = *dex_cache->GetDexFile(); 5084 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 5085 return dex_file.GetMethodShorty(method_id, length); 5086} 5087 5088void ClassLinker::DumpAllClasses(int flags) { 5089 if (dex_cache_image_class_lookup_required_) { 5090 MoveImageClassesToClassTable(); 5091 } 5092 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 5093 // lock held, because it might need to resolve a field's type, which would try to take the lock. 5094 std::vector<mirror::Class*> all_classes; 5095 { 5096 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5097 for (std::pair<const size_t, GcRoot<mirror::Class> >& it : class_table_) { 5098 mirror::Class* klass = it.second.Read(); 5099 all_classes.push_back(klass); 5100 } 5101 } 5102 5103 for (size_t i = 0; i < all_classes.size(); ++i) { 5104 all_classes[i]->DumpClass(std::cerr, flags); 5105 } 5106} 5107 5108void ClassLinker::DumpForSigQuit(std::ostream& os) { 5109 if (dex_cache_image_class_lookup_required_) { 5110 MoveImageClassesToClassTable(); 5111 } 5112 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5113 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 5114} 5115 5116size_t ClassLinker::NumLoadedClasses() { 5117 if (dex_cache_image_class_lookup_required_) { 5118 MoveImageClassesToClassTable(); 5119 } 5120 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 5121 return class_table_.size(); 5122} 5123 5124pid_t ClassLinker::GetClassesLockOwner() { 5125 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 5126} 5127 5128pid_t ClassLinker::GetDexLockOwner() { 5129 return dex_lock_.GetExclusiveOwnerTid(); 5130} 5131 5132void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 5133 DCHECK(!init_done_); 5134 5135 DCHECK(klass != NULL); 5136 DCHECK(klass->GetClassLoader() == NULL); 5137 5138 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 5139 DCHECK(class_roots != NULL); 5140 DCHECK(class_roots->Get(class_root) == NULL); 5141 class_roots->Set<false>(class_root, klass); 5142} 5143 5144} // namespace art 5145