class_linker.cc revision 670134e8555d40fc880271b1ab97483094b4b816
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class_linker.h" 18 19#include <fcntl.h> 20#include <sys/file.h> 21#include <sys/stat.h> 22#include <deque> 23#include <memory> 24#include <string> 25#include <utility> 26#include <vector> 27 28#include "base/casts.h" 29#include "base/logging.h" 30#include "base/scoped_flock.h" 31#include "base/stl_util.h" 32#include "base/unix_file/fd_file.h" 33#include "class_linker-inl.h" 34#include "compiler_callbacks.h" 35#include "debugger.h" 36#include "dex_file-inl.h" 37#include "gc/accounting/card_table-inl.h" 38#include "gc/accounting/heap_bitmap.h" 39#include "gc/heap.h" 40#include "gc/space/image_space.h" 41#include "handle_scope.h" 42#include "intern_table.h" 43#include "interpreter/interpreter.h" 44#include "leb128.h" 45#include "oat.h" 46#include "oat_file.h" 47#include "mirror/art_field-inl.h" 48#include "mirror/art_method-inl.h" 49#include "mirror/class.h" 50#include "mirror/class-inl.h" 51#include "mirror/class_loader.h" 52#include "mirror/dex_cache-inl.h" 53#include "mirror/iftable-inl.h" 54#include "mirror/object-inl.h" 55#include "mirror/object_array-inl.h" 56#include "mirror/proxy.h" 57#include "mirror/stack_trace_element.h" 58#include "object_utils.h" 59#include "os.h" 60#include "runtime.h" 61#include "entrypoints/entrypoint_utils.h" 62#include "ScopedLocalRef.h" 63#include "scoped_thread_state_change.h" 64#include "handle_scope-inl.h" 65#include "thread.h" 66#include "utils.h" 67#include "verifier/method_verifier.h" 68#include "well_known_classes.h" 69 70namespace art { 71 72static void ThrowNoClassDefFoundError(const char* fmt, ...) 73 __attribute__((__format__(__printf__, 1, 2))) 74 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 75static void ThrowNoClassDefFoundError(const char* fmt, ...) { 76 va_list args; 77 va_start(args, fmt); 78 Thread* self = Thread::Current(); 79 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 80 self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args); 81 va_end(args); 82} 83 84static void ThrowEarlierClassFailure(mirror::Class* c) 85 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 86 // The class failed to initialize on a previous attempt, so we want to throw 87 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we 88 // failed in verification, in which case v2 5.4.1 says we need to re-throw 89 // the previous error. 90 if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime. 91 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c); 92 } 93 94 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus(); 95 Thread* self = Thread::Current(); 96 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 97 if (c->GetVerifyErrorClass() != NULL) { 98 // TODO: change the verifier to store an _instance_, with a useful detail message? 99 self->ThrowNewException(throw_location, c->GetVerifyErrorClass()->GetDescriptor().c_str(), 100 PrettyDescriptor(c).c_str()); 101 } else { 102 self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;", 103 PrettyDescriptor(c).c_str()); 104 } 105} 106 107static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 108 Thread* self = Thread::Current(); 109 JNIEnv* env = self->GetJniEnv(); 110 111 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); 112 CHECK(cause.get() != NULL); 113 114 env->ExceptionClear(); 115 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error); 116 env->Throw(cause.get()); 117 118 // We only wrap non-Error exceptions; an Error can just be used as-is. 119 if (!is_error) { 120 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 121 self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL); 122 } 123} 124 125static size_t Hash(const char* s) { 126 // This is the java.lang.String hashcode for convenience, not interoperability. 127 size_t hash = 0; 128 for (; *s != '\0'; ++s) { 129 hash = hash * 31 + *s; 130 } 131 return hash; 132} 133 134const char* ClassLinker::class_roots_descriptors_[] = { 135 "Ljava/lang/Class;", 136 "Ljava/lang/Object;", 137 "[Ljava/lang/Class;", 138 "[Ljava/lang/Object;", 139 "Ljava/lang/String;", 140 "Ljava/lang/DexCache;", 141 "Ljava/lang/ref/Reference;", 142 "Ljava/lang/reflect/ArtField;", 143 "Ljava/lang/reflect/ArtMethod;", 144 "Ljava/lang/reflect/Proxy;", 145 "[Ljava/lang/String;", 146 "[Ljava/lang/reflect/ArtField;", 147 "[Ljava/lang/reflect/ArtMethod;", 148 "Ljava/lang/ClassLoader;", 149 "Ljava/lang/Throwable;", 150 "Ljava/lang/ClassNotFoundException;", 151 "Ljava/lang/StackTraceElement;", 152 "Z", 153 "B", 154 "C", 155 "D", 156 "F", 157 "I", 158 "J", 159 "S", 160 "V", 161 "[Z", 162 "[B", 163 "[C", 164 "[D", 165 "[F", 166 "[I", 167 "[J", 168 "[S", 169 "[Ljava/lang/StackTraceElement;", 170}; 171 172ClassLinker::ClassLinker(InternTable* intern_table) 173 // dex_lock_ is recursive as it may be used in stack dumping. 174 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel), 175 dex_cache_image_class_lookup_required_(false), 176 failed_dex_cache_class_lookups_(0), 177 class_roots_(nullptr), 178 array_iftable_(nullptr), 179 find_array_class_cache_next_victim_(0), 180 init_done_(false), 181 log_new_dex_caches_roots_(false), 182 log_new_class_table_roots_(false), 183 intern_table_(intern_table), 184 portable_resolution_trampoline_(nullptr), 185 quick_resolution_trampoline_(nullptr), 186 portable_imt_conflict_trampoline_(nullptr), 187 quick_imt_conflict_trampoline_(nullptr), 188 quick_generic_jni_trampoline_(nullptr), 189 quick_to_interpreter_bridge_trampoline_(nullptr) { 190 CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax)); 191 memset(find_array_class_cache_, 0, kFindArrayCacheSize * sizeof(mirror::Class*)); 192} 193 194// To set a value for generic JNI. May be necessary in compiler tests. 195extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*); 196 197void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) { 198 VLOG(startup) << "ClassLinker::Init"; 199 CHECK(Runtime::Current()->IsCompiler()); 200 201 CHECK(!init_done_); 202 203 // java_lang_Class comes first, it's needed for AllocClass 204 Thread* self = Thread::Current(); 205 gc::Heap* heap = Runtime::Current()->GetHeap(); 206 // The GC can't handle an object with a null class since we can't get the size of this object. 207 heap->IncrementDisableMovingGC(self); 208 StackHandleScope<64> hs(self); // 64 is picked arbitrarily. 209 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>( 210 heap->AllocNonMovableObject<true>(self, nullptr, sizeof(mirror::ClassClass), 211 VoidFunctor())))); 212 CHECK(java_lang_Class.Get() != NULL); 213 mirror::Class::SetClassClass(java_lang_Class.Get()); 214 java_lang_Class->SetClass(java_lang_Class.Get()); 215 if (kUseBakerOrBrooksReadBarrier) { 216 java_lang_Class->AssertReadBarrierPointer(); 217 } 218 java_lang_Class->SetClassSize(sizeof(mirror::ClassClass)); 219 heap->DecrementDisableMovingGC(self); 220 // AllocClass(mirror::Class*) can now be used 221 222 // Class[] is used for reflection support. 223 Handle<mirror::Class> class_array_class( 224 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 225 class_array_class->SetComponentType(java_lang_Class.Get()); 226 227 // java_lang_Object comes next so that object_array_class can be created. 228 Handle<mirror::Class> java_lang_Object( 229 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 230 CHECK(java_lang_Object.Get() != NULL); 231 // backfill Object as the super class of Class. 232 java_lang_Class->SetSuperClass(java_lang_Object.Get()); 233 java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self); 234 235 // Object[] next to hold class roots. 236 Handle<mirror::Class> object_array_class( 237 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 238 object_array_class->SetComponentType(java_lang_Object.Get()); 239 240 // Setup the char class to be used for char[]. 241 Handle<mirror::Class> char_class(hs.NewHandle(AllocClass(self, java_lang_Class.Get(), 242 sizeof(mirror::Class)))); 243 244 // Setup the char[] class to be used for String. 245 Handle<mirror::Class> char_array_class(hs.NewHandle(AllocClass(self, java_lang_Class.Get(), 246 sizeof(mirror::Class)))); 247 char_array_class->SetComponentType(char_class.Get()); 248 mirror::CharArray::SetArrayClass(char_array_class.Get()); 249 250 // Setup String. 251 Handle<mirror::Class> java_lang_String(hs.NewHandle(AllocClass(self, java_lang_Class.Get(), 252 sizeof(mirror::StringClass)))); 253 mirror::String::SetClass(java_lang_String.Get()); 254 java_lang_String->SetObjectSize(sizeof(mirror::String)); 255 java_lang_String->SetStatus(mirror::Class::kStatusResolved, self); 256 257 // Create storage for root classes, save away our work so far (requires descriptors). 258 class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(), 259 kClassRootsMax); 260 CHECK(class_roots_ != NULL); 261 SetClassRoot(kJavaLangClass, java_lang_Class.Get()); 262 SetClassRoot(kJavaLangObject, java_lang_Object.Get()); 263 SetClassRoot(kClassArrayClass, class_array_class.Get()); 264 SetClassRoot(kObjectArrayClass, object_array_class.Get()); 265 SetClassRoot(kCharArrayClass, char_array_class.Get()); 266 SetClassRoot(kJavaLangString, java_lang_String.Get()); 267 268 // Setup the primitive type classes. 269 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean)); 270 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte)); 271 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort)); 272 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt)); 273 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong)); 274 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat)); 275 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble)); 276 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid)); 277 278 // Create array interface entries to populate once we can load system classes. 279 array_iftable_ = AllocIfTable(self, 2); 280 281 // Create int array type for AllocDexCache (done in AppendToBootClassPath). 282 Handle<mirror::Class> int_array_class( 283 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 284 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt)); 285 mirror::IntArray::SetArrayClass(int_array_class.Get()); 286 SetClassRoot(kIntArrayClass, int_array_class.Get()); 287 288 // now that these are registered, we can use AllocClass() and AllocObjectArray 289 290 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache. 291 Handle<mirror::Class> java_lang_DexCache( 292 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::DexCacheClass)))); 293 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get()); 294 java_lang_DexCache->SetObjectSize(sizeof(mirror::DexCache)); 295 java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self); 296 297 // Constructor, Field, Method, and AbstractMethod are necessary so 298 // that FindClass can link members. 299 Handle<mirror::Class> java_lang_reflect_ArtField( 300 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::ArtFieldClass)))); 301 CHECK(java_lang_reflect_ArtField.Get() != NULL); 302 java_lang_reflect_ArtField->SetObjectSize(sizeof(mirror::ArtField)); 303 SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.Get()); 304 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self); 305 mirror::ArtField::SetClass(java_lang_reflect_ArtField.Get()); 306 307 Handle<mirror::Class> java_lang_reflect_ArtMethod( 308 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::ArtMethodClass)))); 309 CHECK(java_lang_reflect_ArtMethod.Get() != NULL); 310 java_lang_reflect_ArtMethod->SetObjectSize(sizeof(mirror::ArtMethod)); 311 SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.Get()); 312 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self); 313 314 mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.Get()); 315 316 // Set up array classes for string, field, method 317 Handle<mirror::Class> object_array_string( 318 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 319 object_array_string->SetComponentType(java_lang_String.Get()); 320 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get()); 321 322 Handle<mirror::Class> object_array_art_method( 323 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 324 object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.Get()); 325 SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.Get()); 326 327 Handle<mirror::Class> object_array_art_field( 328 hs.NewHandle(AllocClass(self, java_lang_Class.Get(), sizeof(mirror::Class)))); 329 object_array_art_field->SetComponentType(java_lang_reflect_ArtField.Get()); 330 SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.Get()); 331 332 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create 333 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses 334 // these roots. 335 CHECK_NE(0U, boot_class_path.size()); 336 for (size_t i = 0; i != boot_class_path.size(); ++i) { 337 const DexFile* dex_file = boot_class_path[i]; 338 CHECK(dex_file != NULL); 339 AppendToBootClassPath(*dex_file); 340 } 341 342 // now we can use FindSystemClass 343 344 // run char class through InitializePrimitiveClass to finish init 345 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar); 346 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor 347 348 // Create runtime resolution and imt conflict methods. Also setup the default imt. 349 Runtime* runtime = Runtime::Current(); 350 runtime->SetResolutionMethod(runtime->CreateResolutionMethod()); 351 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod()); 352 runtime->SetDefaultImt(runtime->CreateDefaultImt(this)); 353 354 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that 355 // we do not need friend classes or a publicly exposed setter. 356 quick_generic_jni_trampoline_ = reinterpret_cast<void*>(art_quick_generic_jni_trampoline); 357 358 // Object, String and DexCache need to be rerun through FindSystemClass to finish init 359 java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self); 360 mirror::Class* Object_class = FindSystemClass(self, "Ljava/lang/Object;"); 361 CHECK_EQ(java_lang_Object.Get(), Object_class); 362 CHECK_EQ(java_lang_Object->GetObjectSize(), sizeof(mirror::Object)); 363 java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self); 364 mirror::Class* String_class = FindSystemClass(self, "Ljava/lang/String;"); 365 CHECK_EQ(java_lang_String.Get(), String_class); 366 CHECK_EQ(java_lang_String->GetObjectSize(), sizeof(mirror::String)); 367 java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self); 368 mirror::Class* DexCache_class = FindSystemClass(self, "Ljava/lang/DexCache;"); 369 CHECK_EQ(java_lang_String.Get(), String_class); 370 CHECK_EQ(java_lang_DexCache.Get(), DexCache_class); 371 CHECK_EQ(java_lang_DexCache->GetObjectSize(), sizeof(mirror::DexCache)); 372 373 // Setup the primitive array type classes - can't be done until Object has a vtable. 374 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z")); 375 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 376 377 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B")); 378 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 379 380 mirror::Class* found_char_array_class = FindSystemClass(self, "[C"); 381 CHECK_EQ(char_array_class.Get(), found_char_array_class); 382 383 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S")); 384 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 385 386 mirror::Class* found_int_array_class = FindSystemClass(self, "[I"); 387 CHECK_EQ(int_array_class.Get(), found_int_array_class); 388 389 SetClassRoot(kLongArrayClass, FindSystemClass(self, "[J")); 390 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 391 392 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F")); 393 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 394 395 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D")); 396 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 397 398 mirror::Class* found_class_array_class = FindSystemClass(self, "[Ljava/lang/Class;"); 399 CHECK_EQ(class_array_class.Get(), found_class_array_class); 400 401 mirror::Class* found_object_array_class = FindSystemClass(self, "[Ljava/lang/Object;"); 402 CHECK_EQ(object_array_class.Get(), found_object_array_class); 403 404 // Setup the single, global copy of "iftable". 405 mirror::Class* java_lang_Cloneable = FindSystemClass(self, "Ljava/lang/Cloneable;"); 406 CHECK(java_lang_Cloneable != NULL); 407 mirror::Class* java_io_Serializable = FindSystemClass(self, "Ljava/io/Serializable;"); 408 CHECK(java_io_Serializable != NULL); 409 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to 410 // crawl up and explicitly list all of the supers as well. 411 { 412 mirror::IfTable* array_iftable = 413 ReadBarrier::BarrierForRoot<mirror::IfTable, kWithReadBarrier>(&array_iftable_); 414 array_iftable->SetInterface(0, java_lang_Cloneable); 415 array_iftable->SetInterface(1, java_io_Serializable); 416 } 417 418 // Sanity check Class[] and Object[]'s interfaces. 419 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, class_array_class, 0)); 420 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, class_array_class, 1)); 421 CHECK_EQ(java_lang_Cloneable, mirror::Class::GetDirectInterface(self, object_array_class, 0)); 422 CHECK_EQ(java_io_Serializable, mirror::Class::GetDirectInterface(self, object_array_class, 1)); 423 // Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their 424 // dex_cache_ fields and register them in class_table_. 425 mirror::Class* Class_class = FindSystemClass(self, "Ljava/lang/Class;"); 426 CHECK_EQ(java_lang_Class.Get(), Class_class); 427 428 java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self); 429 mirror::Class* Art_method_class = FindSystemClass(self, "Ljava/lang/reflect/ArtMethod;"); 430 CHECK_EQ(java_lang_reflect_ArtMethod.Get(), Art_method_class); 431 432 java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self); 433 mirror::Class* Art_field_class = FindSystemClass(self, "Ljava/lang/reflect/ArtField;"); 434 CHECK_EQ(java_lang_reflect_ArtField.Get(), Art_field_class); 435 436 mirror::Class* String_array_class = 437 FindSystemClass(self, class_roots_descriptors_[kJavaLangStringArrayClass]); 438 CHECK_EQ(object_array_string.Get(), String_array_class); 439 440 mirror::Class* Art_method_array_class = 441 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]); 442 CHECK_EQ(object_array_art_method.Get(), Art_method_array_class); 443 444 mirror::Class* Art_field_array_class = 445 FindSystemClass(self, class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]); 446 CHECK_EQ(object_array_art_field.Get(), Art_field_array_class); 447 448 // End of special init trickery, subsequent classes may be loaded via FindSystemClass. 449 450 // Create java.lang.reflect.Proxy root. 451 mirror::Class* java_lang_reflect_Proxy = FindSystemClass(self, "Ljava/lang/reflect/Proxy;"); 452 SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy); 453 454 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes 455 mirror::Class* java_lang_ref_Reference = FindSystemClass(self, "Ljava/lang/ref/Reference;"); 456 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference); 457 mirror::Class* java_lang_ref_FinalizerReference = 458 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 459 java_lang_ref_FinalizerReference->SetAccessFlags( 460 java_lang_ref_FinalizerReference->GetAccessFlags() | 461 kAccClassIsReference | kAccClassIsFinalizerReference); 462 mirror::Class* java_lang_ref_PhantomReference = 463 FindSystemClass(self, "Ljava/lang/ref/PhantomReference;"); 464 java_lang_ref_PhantomReference->SetAccessFlags( 465 java_lang_ref_PhantomReference->GetAccessFlags() | 466 kAccClassIsReference | kAccClassIsPhantomReference); 467 mirror::Class* java_lang_ref_SoftReference = 468 FindSystemClass(self, "Ljava/lang/ref/SoftReference;"); 469 java_lang_ref_SoftReference->SetAccessFlags( 470 java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference); 471 mirror::Class* java_lang_ref_WeakReference = 472 FindSystemClass(self, "Ljava/lang/ref/WeakReference;"); 473 java_lang_ref_WeakReference->SetAccessFlags( 474 java_lang_ref_WeakReference->GetAccessFlags() | 475 kAccClassIsReference | kAccClassIsWeakReference); 476 477 // Setup the ClassLoader, verifying the object_size_. 478 mirror::Class* java_lang_ClassLoader = FindSystemClass(self, "Ljava/lang/ClassLoader;"); 479 CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), sizeof(mirror::ClassLoader)); 480 SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader); 481 482 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and 483 // java.lang.StackTraceElement as a convenience. 484 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;")); 485 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 486 SetClassRoot(kJavaLangClassNotFoundException, 487 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;")); 488 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;")); 489 SetClassRoot(kJavaLangStackTraceElementArrayClass, 490 FindSystemClass(self, "[Ljava/lang/StackTraceElement;")); 491 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 492 493 FinishInit(self); 494 495 VLOG(startup) << "ClassLinker::InitFromCompiler exiting"; 496} 497 498void ClassLinker::FinishInit(Thread* self) { 499 VLOG(startup) << "ClassLinker::FinishInit entering"; 500 501 // Let the heap know some key offsets into java.lang.ref instances 502 // Note: we hard code the field indexes here rather than using FindInstanceField 503 // as the types of the field can't be resolved prior to the runtime being 504 // fully initialized 505 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference); 506 mirror::Class* java_lang_ref_FinalizerReference = 507 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;"); 508 509 mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0); 510 CHECK_STREQ(pendingNext->GetName(), "pendingNext"); 511 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 512 513 mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1); 514 CHECK_STREQ(queue->GetName(), "queue"); 515 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;"); 516 517 mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2); 518 CHECK_STREQ(queueNext->GetName(), "queueNext"); 519 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;"); 520 521 mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3); 522 CHECK_STREQ(referent->GetName(), "referent"); 523 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;"); 524 525 mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2); 526 CHECK_STREQ(zombie->GetName(), "zombie"); 527 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;"); 528 529 // ensure all class_roots_ are initialized 530 for (size_t i = 0; i < kClassRootsMax; i++) { 531 ClassRoot class_root = static_cast<ClassRoot>(i); 532 mirror::Class* klass = GetClassRoot(class_root); 533 CHECK(klass != NULL); 534 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL); 535 // note SetClassRoot does additional validation. 536 // if possible add new checks there to catch errors early 537 } 538 539 CHECK(array_iftable_ != NULL); 540 541 // disable the slow paths in FindClass and CreatePrimitiveClass now 542 // that Object, Class, and Object[] are setup 543 init_done_ = true; 544 545 VLOG(startup) << "ClassLinker::FinishInit exiting"; 546} 547 548void ClassLinker::RunRootClinits() { 549 Thread* self = Thread::Current(); 550 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) { 551 mirror::Class* c = GetClassRoot(ClassRoot(i)); 552 if (!c->IsArrayClass() && !c->IsPrimitive()) { 553 StackHandleScope<1> hs(self); 554 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i)))); 555 EnsureInitialized(h_class, true, true); 556 self->AssertNoPendingException(); 557 } 558 } 559} 560 561bool ClassLinker::GenerateOatFile(const char* dex_filename, 562 int oat_fd, 563 const char* oat_cache_filename, 564 std::string* error_msg) { 565 Locks::mutator_lock_->AssertNotHeld(Thread::Current()); // Avoid starving GC. 566 std::string dex2oat(Runtime::Current()->GetCompilerExecutable()); 567 568 gc::Heap* heap = Runtime::Current()->GetHeap(); 569 std::string boot_image_option("--boot-image="); 570 boot_image_option += heap->GetImageSpace()->GetImageLocation(); 571 572 std::string dex_file_option("--dex-file="); 573 dex_file_option += dex_filename; 574 575 std::string oat_fd_option("--oat-fd="); 576 StringAppendF(&oat_fd_option, "%d", oat_fd); 577 578 std::string oat_location_option("--oat-location="); 579 oat_location_option += oat_cache_filename; 580 581 std::vector<std::string> argv; 582 argv.push_back(dex2oat); 583 argv.push_back("--runtime-arg"); 584 argv.push_back("-classpath"); 585 argv.push_back("--runtime-arg"); 586 argv.push_back(Runtime::Current()->GetClassPathString()); 587 588 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 589 590 if (!Runtime::Current()->IsVerificationEnabled()) { 591 argv.push_back("--compiler-filter=verify-none"); 592 } 593 594 if (!kIsTargetBuild) { 595 argv.push_back("--host"); 596 } 597 598 argv.push_back(boot_image_option); 599 argv.push_back(dex_file_option); 600 argv.push_back(oat_fd_option); 601 argv.push_back(oat_location_option); 602 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 603 for (size_t i = 0; i < compiler_options.size(); ++i) { 604 argv.push_back(compiler_options[i].c_str()); 605 } 606 607 return Exec(argv, error_msg); 608} 609 610const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 611 WriterMutexLock mu(Thread::Current(), dex_lock_); 612 if (kIsDebugBuild) { 613 for (size_t i = 0; i < oat_files_.size(); ++i) { 614 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 615 } 616 } 617 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 618 oat_files_.push_back(oat_file); 619 return oat_file; 620} 621 622OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 623 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 624 OatFile* oat_file = space->ReleaseOatFile(); 625 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 626 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 627 return *oat_file; 628} 629 630const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 631 const char* dex_location = dex_file.GetLocation().c_str(); 632 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 633 return FindOpenedOatFile(nullptr, dex_location, &dex_location_checksum); 634} 635 636const OatFile* ClassLinker::FindOpenedOatFile(const char* oat_location, const char* dex_location, 637 const uint32_t* const dex_location_checksum) { 638 ReaderMutexLock mu(Thread::Current(), dex_lock_); 639 for (size_t i = 0; i < oat_files_.size(); i++) { 640 const OatFile* oat_file = oat_files_[i]; 641 DCHECK(oat_file != NULL); 642 643 if (oat_location != nullptr) { 644 if (oat_file->GetLocation() != oat_location) { 645 continue; 646 } 647 } 648 649 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 650 dex_location_checksum, 651 false); 652 if (oat_dex_file != NULL) { 653 return oat_file; 654 } 655 } 656 return NULL; 657} 658 659static std::string GetMultiDexClassesDexName(size_t number, const char* dex_location) { 660 if (number == 0) { 661 return dex_location; 662 } else { 663 return StringPrintf("%s" kMultiDexSeparatorString "classes%zu.dex", dex_location, number + 1); 664 } 665} 666 667static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, const char* dex_location, 668 bool generated, 669 std::vector<std::string>* error_msgs, 670 std::vector<const DexFile*>* dex_files) { 671 if (oat_file == nullptr) { 672 return false; 673 } 674 675 size_t old_size = dex_files->size(); // To rollback on error. 676 677 bool success = true; 678 for (size_t i = 0; success; ++i) { 679 std::string next_name_str = GetMultiDexClassesDexName(i, dex_location); 680 const char* next_name = next_name_str.c_str(); 681 682 uint32_t dex_location_checksum; 683 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 684 std::string error_msg; 685 if (!DexFile::GetChecksum(next_name, dex_location_checksum_pointer, &error_msg)) { 686 DCHECK_EQ(false, i == 0 && generated); 687 dex_location_checksum_pointer = nullptr; 688 } 689 690 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 691 692 if (oat_dex_file == nullptr) { 693 if (i == 0 && generated) { 694 std::string error_msg; 695 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 696 " file'%s'", dex_location, dex_location_checksum, 697 oat_file->GetLocation().c_str()); 698 error_msgs->push_back(error_msg); 699 } 700 break; // Not found, done. 701 } 702 703 // Checksum test. Test must succeed when generated. 704 success = !generated; 705 if (dex_location_checksum_pointer != nullptr) { 706 success = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 707 } 708 709 if (success) { 710 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 711 if (dex_file == nullptr) { 712 success = false; 713 error_msgs->push_back(error_msg); 714 } else { 715 dex_files->push_back(dex_file); 716 } 717 } 718 719 // When we generated the file, we expect success, or something is terribly wrong. 720 CHECK_EQ(false, generated && !success) 721 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 722 << std::hex << " dex_location_checksum=" << dex_location_checksum 723 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 724 } 725 726 if (dex_files->size() == old_size) { 727 success = false; // We did not even find classes.dex 728 } 729 730 if (success) { 731 return true; 732 } else { 733 // Free all the dex files we have loaded. 734 auto it = dex_files->begin() + old_size; 735 auto it_end = dex_files->end(); 736 for (; it != it_end; it++) { 737 delete *it; 738 } 739 dex_files->erase(dex_files->begin() + old_size, it_end); 740 741 return false; 742 } 743} 744 745// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 746// complicates the loading process, as we should not use an iterative loading process, because that 747// would register the oat file and dex files that come before the broken one. Instead, check all 748// multidex ahead of time. 749bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 750 std::vector<std::string>* error_msgs, 751 std::vector<const DexFile*>* dex_files) { 752 // 1) Check whether we have an open oat file. 753 // This requires a dex checksum, use the "primary" one. 754 uint32_t dex_location_checksum; 755 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 756 bool have_checksum = true; 757 std::string checksum_error_msg; 758 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 759 dex_location_checksum_pointer = nullptr; 760 have_checksum = false; 761 } 762 763 bool needs_registering = false; 764 765 std::unique_ptr<const OatFile> open_oat_file(FindOpenedOatFile(oat_location, dex_location, 766 dex_location_checksum_pointer)); 767 768 // 2) If we do not have an open one, maybe there's one on disk already. 769 770 // In case the oat file is not open, we play a locking game here so 771 // that if two different processes race to load and register or generate 772 // (or worse, one tries to open a partial generated file) we will be okay. 773 // This is actually common with apps that use DexClassLoader to work 774 // around the dex method reference limit and that have a background 775 // service running in a separate process. 776 ScopedFlock scoped_flock; 777 778 if (open_oat_file.get() == nullptr) { 779 if (oat_location != nullptr) { 780 // Can only do this if we have a checksum, else error. 781 if (!have_checksum) { 782 error_msgs->push_back(checksum_error_msg); 783 return false; 784 } 785 786 std::string error_msg; 787 788 // We are loading or creating one in the future. Time to set up the file lock. 789 if (!scoped_flock.Init(oat_location, &error_msg)) { 790 error_msgs->push_back(error_msg); 791 return false; 792 } 793 794 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 795 oat_location, &error_msg)); 796 797 if (open_oat_file.get() == nullptr) { 798 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 799 dex_location, oat_location, error_msg.c_str()); 800 VLOG(class_linker) << compound_msg; 801 error_msgs->push_back(compound_msg); 802 } 803 } else { 804 // TODO: What to lock here? 805 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 806 dex_location_checksum_pointer, 807 kRuntimeISA, error_msgs)); 808 } 809 needs_registering = true; 810 } 811 812 // 3) If we have an oat file, check all contained multidex files for our dex_location. 813 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 814 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, false, error_msgs, 815 dex_files); 816 if (success) { 817 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 818 if (needs_registering) { 819 // We opened the oat file, so we must register it. 820 RegisterOatFile(oat_file); 821 } 822 return true; 823 } else { 824 if (needs_registering) { 825 // We opened it, delete it. 826 open_oat_file.reset(); 827 } else { 828 open_oat_file.release(); // Do not delete open oat files. 829 } 830 } 831 832 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 833 834 // Need a checksum, fail else. 835 if (!have_checksum) { 836 error_msgs->push_back(checksum_error_msg); 837 return false; 838 } 839 840 // Look in cache location if no oat_location is given. 841 std::string cache_location; 842 if (oat_location == nullptr) { 843 // Use the dalvik cache. 844 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 845 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 846 oat_location = cache_location.c_str(); 847 } 848 849 // Definitely need to lock now. 850 if (!scoped_flock.HasFile()) { 851 std::string error_msg; 852 if (!scoped_flock.Init(oat_location, &error_msg)) { 853 error_msgs->push_back(error_msg); 854 return false; 855 } 856 } 857 858 // Create the oat file. 859 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 860 oat_location, error_msgs)); 861 862 // Failed, bail. 863 if (open_oat_file.get() == nullptr) { 864 return false; 865 } 866 867 // Try to load again, but stronger checks. 868 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, true, error_msgs, 869 dex_files); 870 if (success) { 871 RegisterOatFile(open_oat_file.release()); 872 return true; 873 } else { 874 return false; 875 } 876} 877 878const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 879 uint32_t dex_location_checksum, 880 const char* oat_location, 881 std::string* error_msg) { 882 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 883 !Runtime::Current()->IsCompiler(), 884 error_msg)); 885 if (oat_file.get() == nullptr) { 886 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 887 error_msg->c_str()); 888 return nullptr; 889 } 890 Runtime* runtime = Runtime::Current(); 891 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 892 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 893 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 894 if (expected_image_oat_checksum != actual_image_oat_checksum) { 895 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 896 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 897 actual_image_oat_checksum); 898 return nullptr; 899 } 900 901 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 902 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 903 if (expected_image_oat_offset != actual_image_oat_offset) { 904 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 905 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 906 actual_image_oat_offset); 907 return nullptr; 908 } 909 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 910 &dex_location_checksum); 911 if (oat_dex_file == nullptr) { 912 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 913 dex_location); 914 return nullptr; 915 } 916 uint32_t expected_dex_checksum = dex_location_checksum; 917 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 918 if (expected_dex_checksum != actual_dex_checksum) { 919 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 920 "found 0x%x", oat_location, expected_dex_checksum, 921 actual_dex_checksum); 922 return nullptr; 923 } 924 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 925 if (dex_file.get() != nullptr) { 926 return oat_file.release(); 927 } else { 928 return nullptr; 929 } 930} 931 932const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 933 int fd, const char* oat_location, 934 std::vector<std::string>* error_msgs) { 935 // Generate the output oat file for the dex file 936 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 937 std::string error_msg; 938 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 939 CHECK(!error_msg.empty()); 940 error_msgs->push_back(error_msg); 941 return nullptr; 942 } 943 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 944 !Runtime::Current()->IsCompiler(), 945 &error_msg)); 946 if (oat_file.get() == nullptr) { 947 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 948 oat_location, error_msg.c_str()); 949 error_msgs->push_back(compound_msg); 950 return nullptr; 951 } 952 953 return oat_file.release(); 954} 955 956bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 957 const char* dex_location, 958 uint32_t dex_location_checksum, 959 const InstructionSet instruction_set, 960 std::string* error_msg) { 961 Runtime* runtime = Runtime::Current(); 962 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 963 964 // If the requested instruction set is the same as the current runtime, 965 // we can use the checksums directly. If it isn't, we'll have to read the 966 // image header from the image for the right instruction set. 967 uint32_t image_oat_checksum = 0; 968 uintptr_t image_oat_data_begin = 0; 969 if (instruction_set == kRuntimeISA) { 970 const ImageHeader& image_header = image_space->GetImageHeader(); 971 image_oat_checksum = image_header.GetOatChecksum(); 972 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 973 } else { 974 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 975 image_space->GetImageLocation().c_str(), instruction_set)); 976 image_oat_checksum = image_header->GetOatChecksum(); 977 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 978 } 979 const OatHeader& oat_header = oat_file->GetOatHeader(); 980 bool image_check = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 981 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 982 983 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 984 &dex_location_checksum); 985 if (oat_dex_file == NULL) { 986 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 987 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 988 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 989 for (size_t i = 0; i < oat_dex_files.size(); i++) { 990 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 991 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 992 oat_file->GetLocation().c_str(), 993 oat_dex_file->GetDexFileLocation().c_str()); 994 } 995 return false; 996 } 997 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 998 999 if (image_check && dex_check) { 1000 return true; 1001 } 1002 1003 if (!image_check) { 1004 ScopedObjectAccess soa(Thread::Current()); 1005 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with (0x%x, %" PRIdPTR ")", 1006 oat_file->GetLocation().c_str(), 1007 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1008 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1009 image_oat_checksum, image_oat_data_begin); 1010 } 1011 if (!dex_check) { 1012 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1013 oat_file->GetLocation().c_str(), 1014 oat_dex_file->GetDexFileLocationChecksum(), 1015 dex_location, dex_location_checksum); 1016 } 1017 return false; 1018} 1019 1020const OatFile* ClassLinker::LoadOatFileAndVerifyDexFile(const std::string& oat_file_location, 1021 const char* dex_location, 1022 std::string* error_msg, 1023 bool* open_failed) { 1024 std::unique_ptr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 1025 if (oat_file.get() == nullptr) { 1026 *open_failed = true; 1027 return nullptr; 1028 } 1029 *open_failed = false; 1030 std::unique_ptr<const DexFile> dex_file; 1031 uint32_t dex_location_checksum; 1032 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 1033 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1034 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1035 // directory. 1036 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1037 if (oat_dex_file == nullptr) { 1038 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1039 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 1040 error_msg->c_str()); 1041 return nullptr; 1042 } 1043 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1044 } else { 1045 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 1046 kRuntimeISA, error_msg); 1047 if (!verified) { 1048 return nullptr; 1049 } 1050 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1051 &dex_location_checksum)->OpenDexFile(error_msg)); 1052 } 1053 1054 if (dex_file.get() != nullptr) { 1055 return oat_file.release(); 1056 } else { 1057 return nullptr; 1058 } 1059} 1060 1061const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1062 const char* dex_location, 1063 const uint32_t* const dex_location_checksum, 1064 InstructionSet isa, 1065 std::vector<std::string>* error_msgs) { 1066 // Look for an existing file next to dex. for example, for 1067 // /foo/bar/baz.jar, look for /foo/bar/<isa>/baz.odex. 1068 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1069 bool open_failed; 1070 std::string error_msg; 1071 const OatFile* oat_file = LoadOatFileAndVerifyDexFile(odex_filename, dex_location, &error_msg, 1072 &open_failed); 1073 if (oat_file != nullptr) { 1074 return oat_file; 1075 } 1076 if (dex_location_checksum == nullptr) { 1077 error_msgs->push_back(StringPrintf("Failed to open oat file from %s and no classes.dex found in" 1078 "%s: %s", odex_filename.c_str(), dex_location, 1079 error_msg.c_str())); 1080 return nullptr; 1081 } 1082 1083 std::string cache_error_msg; 1084 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 1085 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location, 1086 dalvik_cache.c_str())); 1087 oat_file = LoadOatFileAndVerifyDexFile(cache_location, dex_location, &cache_error_msg, 1088 &open_failed); 1089 if (oat_file != nullptr) { 1090 return oat_file; 1091 } 1092 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 1093 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 1094 } 1095 std::string compound_msg = StringPrintf("Failed to open oat file from %s (error '%s') or %s " 1096 "(error '%s').", odex_filename.c_str(), error_msg.c_str(), 1097 cache_location.c_str(), cache_error_msg.c_str()); 1098 VLOG(class_linker) << compound_msg; 1099 error_msgs->push_back(compound_msg); 1100 1101 return nullptr; 1102} 1103 1104const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1105 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1106 for (size_t i = 0; i < oat_files_.size(); i++) { 1107 const OatFile* oat_file = oat_files_[i]; 1108 DCHECK(oat_file != nullptr); 1109 if (oat_file->GetLocation() == oat_location) { 1110 return oat_file; 1111 } 1112 } 1113 return nullptr; 1114} 1115 1116const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1117 std::string* error_msg) { 1118 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1119 if (oat_file != nullptr) { 1120 return oat_file; 1121 } 1122 1123 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1124 error_msg); 1125 if (oat_file == NULL) { 1126 return NULL; 1127 } 1128 return oat_file; 1129} 1130 1131static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1132 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1133 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1134 1135 DCHECK(obj != NULL); 1136 DCHECK(class_linker != NULL); 1137 1138 if (obj->IsArtMethod()) { 1139 mirror::ArtMethod* method = obj->AsArtMethod(); 1140 if (!method->IsNative()) { 1141 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1142 if (method != Runtime::Current()->GetResolutionMethod()) { 1143 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1144 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1145 } 1146 } 1147 } 1148} 1149 1150void ClassLinker::InitFromImage() { 1151 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1152 CHECK(!init_done_); 1153 1154 Thread* self = Thread::Current(); 1155 gc::Heap* heap = Runtime::Current()->GetHeap(); 1156 gc::space::ImageSpace* space = heap->GetImageSpace(); 1157 dex_cache_image_class_lookup_required_ = true; 1158 CHECK(space != NULL); 1159 OatFile& oat_file = GetImageOatFile(space); 1160 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1161 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1162 CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty()); 1163 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1164 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1165 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1166 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1167 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1168 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1169 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1170 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1171 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1172 1173 StackHandleScope<1> hs(self); 1174 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1175 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1176 AsObjectArray<mirror::Class>())); 1177 class_roots_ = class_roots.Get(); 1178 1179 // Special case of setting up the String class early so that we can test arbitrary objects 1180 // as being Strings or not 1181 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1182 1183 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1184 static_cast<uint32_t>(dex_caches->GetLength())); 1185 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1186 StackHandleScope<1> hs(self); 1187 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1188 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1189 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1190 nullptr); 1191 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1192 std::string error_msg; 1193 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1194 if (dex_file == NULL) { 1195 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1196 << " from within oat file " << oat_file.GetLocation() 1197 << " error '" << error_msg << "'"; 1198 } 1199 1200 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1201 1202 AppendToBootClassPath(*dex_file, dex_cache); 1203 } 1204 1205 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1206 // bitmap walk. 1207 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1208 1209 // Set entry point to interpreter if in InterpretOnly mode. 1210 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1211 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1212 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1213 } 1214 1215 // reinit class_roots_ 1216 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1217 class_roots_ = class_roots.Get(); 1218 1219 // reinit array_iftable_ from any array class instance, they should be == 1220 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1221 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1222 // String class root was set above 1223 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1224 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1225 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1226 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1227 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1228 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1229 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1230 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1231 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1232 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1233 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1234 1235 FinishInit(self); 1236 1237 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1238} 1239 1240void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1241 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1242 if ((flags & kVisitRootFlagAllRoots) != 0) { 1243 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1244 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1245 } 1246 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1247 for (auto& pair : new_class_roots_) { 1248 mirror::Object* old_ref = pair.second; 1249 callback(reinterpret_cast<mirror::Object**>(&pair.second), arg, 0, kRootStickyClass); 1250 if (UNLIKELY(pair.second != old_ref)) { 1251 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1252 // corresponding object. This is slow, but luckily for us, this may only happen with a 1253 // concurrent moving GC. 1254 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1255 it != end && it->first == pair.first; ++it) { 1256 // If the class stored matches the old class, update it to the new value. 1257 if (old_ref == it->second) { 1258 it->second = pair.second; 1259 } 1260 } 1261 } 1262 } 1263 } 1264 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1265 new_class_roots_.clear(); 1266 } 1267 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1268 log_new_class_table_roots_ = true; 1269 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1270 log_new_class_table_roots_ = false; 1271 } 1272 // We deliberately ignore the class roots in the image since we 1273 // handle image roots by using the MS/CMS rescanning of dirty cards. 1274} 1275 1276// Keep in sync with InitCallback. Anything we visit, we need to 1277// reinit references to when reinitializing a ClassLinker from a 1278// mapped image. 1279void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1280 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1281 Thread* self = Thread::Current(); 1282 { 1283 ReaderMutexLock mu(self, dex_lock_); 1284 if ((flags & kVisitRootFlagAllRoots) != 0) { 1285 for (mirror::DexCache*& dex_cache : dex_caches_) { 1286 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1287 } 1288 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1289 for (size_t index : new_dex_cache_roots_) { 1290 callback(reinterpret_cast<mirror::Object**>(&dex_caches_[index]), arg, 0, kRootVMInternal); 1291 } 1292 } 1293 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1294 new_dex_cache_roots_.clear(); 1295 } 1296 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1297 log_new_dex_caches_roots_ = true; 1298 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1299 log_new_dex_caches_roots_ = false; 1300 } 1301 } 1302 VisitClassRoots(callback, arg, flags); 1303 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1304 DCHECK(array_iftable_ != nullptr); 1305 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1306 if (find_array_class_cache_[i] != nullptr) { 1307 callback(reinterpret_cast<mirror::Object**>(&find_array_class_cache_[i]), arg, 0, 1308 kRootVMInternal); 1309 } 1310 } 1311} 1312 1313void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1314 if (dex_cache_image_class_lookup_required_) { 1315 MoveImageClassesToClassTable(); 1316 } 1317 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1318 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1319 mirror::Class** root = &it.second; 1320 mirror::Class* c = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 1321 if (!visitor(c, arg)) { 1322 return; 1323 } 1324 } 1325} 1326 1327static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1328 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1329 classes->insert(c); 1330 return true; 1331} 1332 1333void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1334 std::set<mirror::Class*> classes; 1335 VisitClasses(GetClassesVisitor, &classes); 1336 for (mirror::Class* klass : classes) { 1337 if (!visitor(klass, arg)) { 1338 return; 1339 } 1340 } 1341} 1342 1343ClassLinker::~ClassLinker() { 1344 mirror::Class::ResetClass(); 1345 mirror::String::ResetClass(); 1346 mirror::ArtField::ResetClass(); 1347 mirror::ArtMethod::ResetClass(); 1348 mirror::BooleanArray::ResetArrayClass(); 1349 mirror::ByteArray::ResetArrayClass(); 1350 mirror::CharArray::ResetArrayClass(); 1351 mirror::DoubleArray::ResetArrayClass(); 1352 mirror::FloatArray::ResetArrayClass(); 1353 mirror::IntArray::ResetArrayClass(); 1354 mirror::LongArray::ResetArrayClass(); 1355 mirror::ShortArray::ResetArrayClass(); 1356 mirror::Throwable::ResetClass(); 1357 mirror::StackTraceElement::ResetClass(); 1358 STLDeleteElements(&boot_class_path_); 1359 STLDeleteElements(&oat_files_); 1360} 1361 1362mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1363 gc::Heap* heap = Runtime::Current()->GetHeap(); 1364 StackHandleScope<16> hs(self); 1365 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1366 Handle<mirror::DexCache> dex_cache( 1367 hs.NewHandle(down_cast<mirror::DexCache*>( 1368 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1369 VoidFunctor())))); 1370 if (dex_cache.Get() == NULL) { 1371 return NULL; 1372 } 1373 Handle<mirror::String> 1374 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1375 if (location.Get() == NULL) { 1376 return NULL; 1377 } 1378 Handle<mirror::ObjectArray<mirror::String>> 1379 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1380 if (strings.Get() == NULL) { 1381 return NULL; 1382 } 1383 Handle<mirror::ObjectArray<mirror::Class>> 1384 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1385 if (types.Get() == NULL) { 1386 return NULL; 1387 } 1388 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1389 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1390 if (methods.Get() == NULL) { 1391 return NULL; 1392 } 1393 Handle<mirror::ObjectArray<mirror::ArtField>> 1394 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1395 if (fields.Get() == NULL) { 1396 return NULL; 1397 } 1398 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1399 fields.Get()); 1400 return dex_cache.Get(); 1401} 1402 1403// Used to initialize a class in the allocation code path to ensure it is guarded by a StoreStore 1404// fence. 1405class InitializeClassVisitor { 1406 public: 1407 explicit InitializeClassVisitor(uint32_t class_size) : class_size_(class_size) { 1408 } 1409 1410 void operator()(mirror::Object* obj, size_t usable_size) const 1411 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1412 DCHECK_LE(class_size_, usable_size); 1413 // Avoid AsClass as object is not yet in live bitmap or allocation stack. 1414 mirror::Class* klass = down_cast<mirror::Class*>(obj); 1415 // DCHECK(klass->IsClass()); 1416 klass->SetClassSize(class_size_); 1417 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1418 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1419 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1420 } 1421 1422 private: 1423 const uint32_t class_size_; 1424 1425 DISALLOW_COPY_AND_ASSIGN(InitializeClassVisitor); 1426}; 1427 1428mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1429 uint32_t class_size) { 1430 DCHECK_GE(class_size, sizeof(mirror::Class)); 1431 gc::Heap* heap = Runtime::Current()->GetHeap(); 1432 InitializeClassVisitor visitor(class_size); 1433 mirror::Object* k = kMovingClasses ? 1434 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1435 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1436 if (UNLIKELY(k == nullptr)) { 1437 CHECK(self->IsExceptionPending()); // OOME. 1438 return nullptr; 1439 } 1440 return k->AsClass(); 1441} 1442 1443mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1444 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1445} 1446 1447mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1448 return down_cast<mirror::ArtField*>( 1449 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1450} 1451 1452mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1453 return down_cast<mirror::ArtMethod*>( 1454 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1455} 1456 1457mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1458 Thread* self, size_t length) { 1459 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1460 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1461} 1462 1463static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1464 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1465 DCHECK(klass != NULL); 1466 // Wait for the class if it has not already been linked. 1467 if (!klass->IsResolved() && !klass->IsErroneous()) { 1468 StackHandleScope<1> hs(self); 1469 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1470 ObjectLock<mirror::Class> lock(self, h_class); 1471 // Check for circular dependencies between classes. 1472 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1473 ThrowClassCircularityError(h_class.Get()); 1474 h_class->SetStatus(mirror::Class::kStatusError, self); 1475 return nullptr; 1476 } 1477 // Wait for the pending initialization to complete. 1478 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1479 lock.WaitIgnoringInterrupts(); 1480 } 1481 } 1482 if (klass->IsErroneous()) { 1483 ThrowEarlierClassFailure(klass); 1484 return nullptr; 1485 } 1486 // Return the loaded class. No exceptions should be pending. 1487 CHECK(klass->IsResolved()) << PrettyClass(klass); 1488 self->AssertNoPendingException(); 1489 return klass; 1490} 1491 1492mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1493 Handle<mirror::ClassLoader> class_loader) { 1494 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1495 DCHECK(self != nullptr); 1496 self->AssertNoPendingException(); 1497 if (descriptor[1] == '\0') { 1498 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1499 // for primitive classes that aren't backed by dex files. 1500 return FindPrimitiveClass(descriptor[0]); 1501 } 1502 // Find the class in the loaded classes table. 1503 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1504 if (klass != NULL) { 1505 return EnsureResolved(self, klass); 1506 } 1507 // Class is not yet loaded. 1508 if (descriptor[0] == '[') { 1509 return CreateArrayClass(self, descriptor, class_loader); 1510 } else if (class_loader.Get() == nullptr) { 1511 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1512 if (pair.second != NULL) { 1513 StackHandleScope<1> hs(self); 1514 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1515 } 1516 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1517 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1518 // throw of a NoClassDefFoundError. 1519 if (IsInBootClassPath(descriptor)) { 1520 mirror::Class* system_class = FindSystemClass(self, descriptor); 1521 CHECK(system_class != NULL); 1522 return system_class; 1523 } 1524 // Next try the compile time class path. 1525 const std::vector<const DexFile*>* class_path; 1526 { 1527 ScopedObjectAccessUnchecked soa(self); 1528 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1529 soa.AddLocalReference<jobject>(class_loader.Get())); 1530 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1531 } 1532 1533 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1534 if (pair.second != NULL) { 1535 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1536 } 1537 1538 } else { 1539 ScopedObjectAccessUnchecked soa(self); 1540 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1541 soa.AddLocalReference<jobject>(class_loader.Get())); 1542 std::string class_name_string(DescriptorToDot(descriptor)); 1543 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1544 { 1545 ScopedThreadStateChange tsc(self, kNative); 1546 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1547 soa.Env()->NewStringUTF(class_name_string.c_str())); 1548 if (class_name_object.get() == NULL) { 1549 return NULL; 1550 } 1551 CHECK(class_loader_object.get() != NULL); 1552 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1553 WellKnownClasses::java_lang_ClassLoader_loadClass, 1554 class_name_object.get())); 1555 } 1556 if (self->IsExceptionPending()) { 1557 // If the ClassLoader threw, pass that exception up. 1558 return NULL; 1559 } else if (result.get() == NULL) { 1560 // broken loader - throw NPE to be compatible with Dalvik 1561 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1562 class_name_string.c_str()).c_str()); 1563 return NULL; 1564 } else { 1565 // success, return mirror::Class* 1566 return soa.Decode<mirror::Class*>(result.get()); 1567 } 1568 } 1569 1570 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1571 return NULL; 1572} 1573 1574mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1575 Handle<mirror::ClassLoader> class_loader, 1576 const DexFile& dex_file, 1577 const DexFile::ClassDef& dex_class_def) { 1578 Thread* self = Thread::Current(); 1579 StackHandleScope<2> hs(self); 1580 auto klass = hs.NewHandle<mirror::Class>(nullptr); 1581 // Load the class from the dex file. 1582 if (UNLIKELY(!init_done_)) { 1583 // finish up init of hand crafted class_roots_ 1584 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1585 klass.Assign(GetClassRoot(kJavaLangObject)); 1586 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1587 klass.Assign(GetClassRoot(kJavaLangClass)); 1588 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1589 klass.Assign(GetClassRoot(kJavaLangString)); 1590 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1591 klass.Assign(GetClassRoot(kJavaLangDexCache)); 1592 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1593 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 1594 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1595 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 1596 } else { 1597 klass.Assign(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1598 } 1599 } else { 1600 klass.Assign(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1601 } 1602 if (UNLIKELY(klass.Get() == NULL)) { 1603 CHECK(self->IsExceptionPending()); // Expect an OOME. 1604 return NULL; 1605 } 1606 klass->SetDexCache(FindDexCache(dex_file)); 1607 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 1608 // Check for a pending exception during load 1609 if (self->IsExceptionPending()) { 1610 klass->SetStatus(mirror::Class::kStatusError, self); 1611 return NULL; 1612 } 1613 ObjectLock<mirror::Class> lock(self, klass); 1614 klass->SetClinitThreadId(self->GetTid()); 1615 // Add the newly loaded class to the loaded classes table. 1616 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 1617 if (existing != NULL) { 1618 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1619 // this thread to block. 1620 return EnsureResolved(self, existing); 1621 } 1622 // Finish loading (if necessary) by finding parents 1623 CHECK(!klass->IsLoaded()); 1624 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1625 // Loading failed. 1626 klass->SetStatus(mirror::Class::kStatusError, self); 1627 return NULL; 1628 } 1629 CHECK(klass->IsLoaded()); 1630 // Link the class (if necessary) 1631 CHECK(!klass->IsResolved()); 1632 // TODO: Use fast jobjects? 1633 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1634 if (!LinkClass(self, klass, interfaces)) { 1635 // Linking failed. 1636 klass->SetStatus(mirror::Class::kStatusError, self); 1637 return NULL; 1638 } 1639 CHECK(klass->IsResolved()); 1640 1641 /* 1642 * We send CLASS_PREPARE events to the debugger from here. The 1643 * definition of "preparation" is creating the static fields for a 1644 * class and initializing them to the standard default values, but not 1645 * executing any code (that comes later, during "initialization"). 1646 * 1647 * We did the static preparation in LinkClass. 1648 * 1649 * The class has been prepared and resolved but possibly not yet verified 1650 * at this point. 1651 */ 1652 Dbg::PostClassPrepare(klass.Get()); 1653 1654 return klass.Get(); 1655} 1656 1657// Precomputes size that will be needed for Class, matching LinkStaticFields 1658uint32_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1659 const DexFile::ClassDef& dex_class_def) { 1660 const byte* class_data = dex_file.GetClassData(dex_class_def); 1661 size_t num_ref = 0; 1662 size_t num_32 = 0; 1663 size_t num_64 = 0; 1664 if (class_data != NULL) { 1665 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1666 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1667 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1668 char c = descriptor[0]; 1669 if (c == 'L' || c == '[') { 1670 num_ref++; 1671 } else if (c == 'J' || c == 'D') { 1672 num_64++; 1673 } else { 1674 num_32++; 1675 } 1676 } 1677 } 1678 // start with generic class data 1679 uint32_t size = sizeof(mirror::Class); 1680 // follow with reference fields which must be contiguous at start 1681 size += (num_ref * sizeof(uint32_t)); 1682 // if there are 64-bit fields to add, make sure they are aligned 1683 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1684 if (num_32 != 0) { 1685 // use an available 32-bit field for padding 1686 num_32--; 1687 } 1688 size += sizeof(uint32_t); // either way, we are adding a word 1689 DCHECK_EQ(size, RoundUp(size, 8)); 1690 } 1691 // tack on any 64-bit fields now that alignment is assured 1692 size += (num_64 * sizeof(uint64_t)); 1693 // tack on any remaining 32-bit fields 1694 size += (num_32 * sizeof(uint32_t)); 1695 return size; 1696} 1697 1698OatFile::OatClass ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1699 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1700 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1701 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1702 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1703 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1704 &dex_location_checksum); 1705 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1706 return oat_dex_file->GetOatClass(class_def_idx); 1707} 1708 1709static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1710 uint32_t method_idx) { 1711 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1712 const byte* class_data = dex_file.GetClassData(class_def); 1713 CHECK(class_data != NULL); 1714 ClassDataItemIterator it(dex_file, class_data); 1715 // Skip fields 1716 while (it.HasNextStaticField()) { 1717 it.Next(); 1718 } 1719 while (it.HasNextInstanceField()) { 1720 it.Next(); 1721 } 1722 // Process methods 1723 size_t class_def_method_index = 0; 1724 while (it.HasNextDirectMethod()) { 1725 if (it.GetMemberIndex() == method_idx) { 1726 return class_def_method_index; 1727 } 1728 class_def_method_index++; 1729 it.Next(); 1730 } 1731 while (it.HasNextVirtualMethod()) { 1732 if (it.GetMemberIndex() == method_idx) { 1733 return class_def_method_index; 1734 } 1735 class_def_method_index++; 1736 it.Next(); 1737 } 1738 DCHECK(!it.HasNext()); 1739 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1740 return 0; 1741} 1742 1743const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1744 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1745 // method for direct methods (or virtual methods made direct). 1746 mirror::Class* declaring_class = method->GetDeclaringClass(); 1747 size_t oat_method_index; 1748 if (method->IsStatic() || method->IsDirect()) { 1749 // Simple case where the oat method index was stashed at load time. 1750 oat_method_index = method->GetMethodIndex(); 1751 } else { 1752 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1753 // by search for its position in the declared virtual methods. 1754 oat_method_index = declaring_class->NumDirectMethods(); 1755 size_t end = declaring_class->NumVirtualMethods(); 1756 bool found = false; 1757 for (size_t i = 0; i < end; i++) { 1758 if (declaring_class->GetVirtualMethod(i) == method) { 1759 found = true; 1760 break; 1761 } 1762 oat_method_index++; 1763 } 1764 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1765 } 1766 DCHECK_EQ(oat_method_index, 1767 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1768 method->GetDeclaringClass()->GetDexClassDefIndex(), 1769 method->GetDexMethodIndex())); 1770 const OatFile::OatClass oat_class = GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1771 declaring_class->GetDexClassDefIndex()); 1772 1773 return oat_class.GetOatMethod(oat_method_index); 1774} 1775 1776// Special case to get oat code without overwriting a trampoline. 1777const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1778 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1779 if (method->IsProxyMethod()) { 1780 return GetQuickProxyInvokeHandler(); 1781 } 1782 const void* result = GetOatMethodFor(method).GetQuickCode(); 1783 if (result == nullptr) { 1784 if (method->IsNative()) { 1785 // No code and native? Use generic trampoline. 1786 result = GetQuickGenericJniTrampoline(); 1787 } else if (method->IsPortableCompiled()) { 1788 // No code? Do we expect portable code? 1789 result = GetQuickToPortableBridge(); 1790 } else { 1791 // No code? You must mean to go into the interpreter. 1792 result = GetQuickToInterpreterBridge(); 1793 } 1794 } 1795 return result; 1796} 1797 1798const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1799 bool* have_portable_code) { 1800 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1801 *have_portable_code = false; 1802 if (method->IsProxyMethod()) { 1803 return GetPortableProxyInvokeHandler(); 1804 } 1805 const OatFile::OatMethod oat_method = GetOatMethodFor(method); 1806 const void* result = oat_method.GetPortableCode(); 1807 if (result == nullptr) { 1808 if (oat_method.GetQuickCode() == nullptr) { 1809 // No code? You must mean to go into the interpreter. 1810 result = GetPortableToInterpreterBridge(); 1811 } else { 1812 // No code? But there's quick code, so use a bridge. 1813 result = GetPortableToQuickBridge(); 1814 } 1815 } else { 1816 *have_portable_code = true; 1817 } 1818 return result; 1819} 1820 1821const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1822 uint32_t method_idx) { 1823 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1824 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1825 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 1826} 1827 1828const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1829 uint32_t method_idx) { 1830 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1831 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1832 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 1833} 1834 1835// Returns true if the method must run with interpreter, false otherwise. 1836static bool NeedsInterpreter( 1837 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 1838 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1839 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1840 // No code: need interpreter. 1841 // May return true for native code, in the case of generic JNI 1842 // DCHECK(!method->IsNative()); 1843 return true; 1844 } 1845#ifdef ART_SEA_IR_MODE 1846 ScopedObjectAccess soa(Thread::Current()); 1847 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1848 LOG(INFO) << "Found " << PrettyMethod(method); 1849 return false; 1850 } 1851#endif 1852 // If interpreter mode is enabled, every method (except native and proxy) must 1853 // be run with interpreter. 1854 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1855 !method->IsNative() && !method->IsProxyMethod(); 1856} 1857 1858void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1859 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1860 if (klass->NumDirectMethods() == 0) { 1861 return; // No direct methods => no static methods. 1862 } 1863 Runtime* runtime = Runtime::Current(); 1864 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1865 return; // OAT file unavailable. 1866 } 1867 const DexFile& dex_file = klass->GetDexFile(); 1868 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 1869 CHECK(dex_class_def != nullptr); 1870 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1871 // There should always be class data if there were direct methods. 1872 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1873 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 1874 ClassDataItemIterator it(dex_file, class_data); 1875 // Skip fields 1876 while (it.HasNextStaticField()) { 1877 it.Next(); 1878 } 1879 while (it.HasNextInstanceField()) { 1880 it.Next(); 1881 } 1882 // Link the code of methods skipped by LinkCode. 1883 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1884 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1885 if (!method->IsStatic()) { 1886 // Only update static methods. 1887 continue; 1888 } 1889 const void* portable_code = oat_class.GetOatMethod(method_index).GetPortableCode(); 1890 const void* quick_code = oat_class.GetOatMethod(method_index).GetQuickCode(); 1891 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1892 bool have_portable_code = false; 1893 if (enter_interpreter) { 1894 // Use interpreter entry point. 1895 // Check whether the method is native, in which case it's generic JNI. 1896 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 1897 quick_code = GetQuickGenericJniTrampoline(); 1898 portable_code = GetPortableToQuickBridge(); 1899 } else { 1900 portable_code = GetPortableToInterpreterBridge(); 1901 quick_code = GetQuickToInterpreterBridge(); 1902 } 1903 } else { 1904 if (portable_code == nullptr) { 1905 portable_code = GetPortableToQuickBridge(); 1906 } else { 1907 have_portable_code = true; 1908 } 1909 if (quick_code == nullptr) { 1910 quick_code = GetQuickToPortableBridge(); 1911 } 1912 } 1913 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1914 have_portable_code); 1915 } 1916 // Ignore virtual methods on the iterator. 1917} 1918 1919void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 1920 const DexFile& dex_file, uint32_t dex_method_index, 1921 uint32_t method_index) { 1922 // Method shouldn't have already been linked. 1923 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1924 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1925 // Every kind of method should at least get an invoke stub from the oat_method. 1926 // non-abstract methods also get their code pointers. 1927 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1928 oat_method.LinkMethod(method.Get()); 1929 1930 // Install entry point from interpreter. 1931 Runtime* runtime = Runtime::Current(); 1932 bool enter_interpreter = NeedsInterpreter(method.Get(), 1933 method->GetEntryPointFromQuickCompiledCode(), 1934 method->GetEntryPointFromPortableCompiledCode()); 1935 if (enter_interpreter && !method->IsNative()) { 1936 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1937 } else { 1938 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1939 } 1940 1941 if (method->IsAbstract()) { 1942 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1943 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1944 return; 1945 } 1946 1947 bool have_portable_code = false; 1948 if (method->IsStatic() && !method->IsConstructor()) { 1949 // For static methods excluding the class initializer, install the trampoline. 1950 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1951 // after initializing class (see ClassLinker::InitializeClass method). 1952 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 1953 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 1954 } else if (enter_interpreter) { 1955 if (!method->IsNative()) { 1956 // Set entry point from compiled code if there's no code or in interpreter only mode. 1957 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1958 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1959 } else { 1960 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 1961 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1962 } 1963 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1964 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1965 have_portable_code = true; 1966 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1967 } else { 1968 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1969 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1970 } 1971 1972 if (method->IsNative()) { 1973 // Unregistering restores the dlsym lookup stub. 1974 method->UnregisterNative(Thread::Current()); 1975 1976 if (enter_interpreter) { 1977 // We have a native method here without code. Then it should have either the GenericJni 1978 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 1979 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 1980 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 1981 } 1982 } 1983 1984 // Allow instrumentation its chance to hijack code. 1985 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 1986 method->GetEntryPointFromQuickCompiledCode(), 1987 method->GetEntryPointFromPortableCompiledCode(), 1988 have_portable_code); 1989} 1990 1991void ClassLinker::LoadClass(const DexFile& dex_file, 1992 const DexFile::ClassDef& dex_class_def, 1993 Handle<mirror::Class> klass, 1994 mirror::ClassLoader* class_loader) { 1995 CHECK(klass.Get() != NULL); 1996 CHECK(klass->GetDexCache() != NULL); 1997 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 1998 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 1999 CHECK(descriptor != NULL); 2000 2001 klass->SetClass(GetClassRoot(kJavaLangClass)); 2002 if (kUseBakerOrBrooksReadBarrier) { 2003 klass->AssertReadBarrierPointer(); 2004 } 2005 uint32_t access_flags = dex_class_def.access_flags_; 2006 // Make sure that none of our runtime-only flags are set. 2007 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2008 klass->SetAccessFlags(access_flags); 2009 klass->SetClassLoader(class_loader); 2010 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2011 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2012 2013 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2014 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2015 2016 const byte* class_data = dex_file.GetClassData(dex_class_def); 2017 if (class_data == NULL) { 2018 return; // no fields or methods - for example a marker interface 2019 } 2020 2021 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2022 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 2023 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2024 } else { 2025 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2026 } 2027} 2028 2029void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2030 const byte* class_data, 2031 Handle<mirror::Class> klass, 2032 mirror::ClassLoader* class_loader, 2033 const OatFile::OatClass* oat_class) { 2034 // Load fields. 2035 ClassDataItemIterator it(dex_file, class_data); 2036 Thread* self = Thread::Current(); 2037 if (it.NumStaticFields() != 0) { 2038 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2039 if (UNLIKELY(statics == NULL)) { 2040 CHECK(self->IsExceptionPending()); // OOME. 2041 return; 2042 } 2043 klass->SetSFields(statics); 2044 } 2045 if (it.NumInstanceFields() != 0) { 2046 mirror::ObjectArray<mirror::ArtField>* fields = 2047 AllocArtFieldArray(self, it.NumInstanceFields()); 2048 if (UNLIKELY(fields == NULL)) { 2049 CHECK(self->IsExceptionPending()); // OOME. 2050 return; 2051 } 2052 klass->SetIFields(fields); 2053 } 2054 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2055 StackHandleScope<1> hs(self); 2056 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2057 if (UNLIKELY(sfield.Get() == NULL)) { 2058 CHECK(self->IsExceptionPending()); // OOME. 2059 return; 2060 } 2061 klass->SetStaticField(i, sfield.Get()); 2062 LoadField(dex_file, it, klass, sfield); 2063 } 2064 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2065 StackHandleScope<1> hs(self); 2066 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2067 if (UNLIKELY(ifield.Get() == NULL)) { 2068 CHECK(self->IsExceptionPending()); // OOME. 2069 return; 2070 } 2071 klass->SetInstanceField(i, ifield.Get()); 2072 LoadField(dex_file, it, klass, ifield); 2073 } 2074 2075 // Load methods. 2076 if (it.NumDirectMethods() != 0) { 2077 // TODO: append direct methods to class object 2078 mirror::ObjectArray<mirror::ArtMethod>* directs = 2079 AllocArtMethodArray(self, it.NumDirectMethods()); 2080 if (UNLIKELY(directs == NULL)) { 2081 CHECK(self->IsExceptionPending()); // OOME. 2082 return; 2083 } 2084 klass->SetDirectMethods(directs); 2085 } 2086 if (it.NumVirtualMethods() != 0) { 2087 // TODO: append direct methods to class object 2088 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2089 AllocArtMethodArray(self, it.NumVirtualMethods()); 2090 if (UNLIKELY(virtuals == NULL)) { 2091 CHECK(self->IsExceptionPending()); // OOME. 2092 return; 2093 } 2094 klass->SetVirtualMethods(virtuals); 2095 } 2096 size_t class_def_method_index = 0; 2097 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2098 StackHandleScope<1> hs(self); 2099 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2100 if (UNLIKELY(method.Get() == NULL)) { 2101 CHECK(self->IsExceptionPending()); // OOME. 2102 return; 2103 } 2104 klass->SetDirectMethod(i, method.Get()); 2105 if (oat_class != nullptr) { 2106 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2107 } 2108 method->SetMethodIndex(class_def_method_index); 2109 class_def_method_index++; 2110 } 2111 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2112 StackHandleScope<1> hs(self); 2113 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2114 if (UNLIKELY(method.Get() == NULL)) { 2115 CHECK(self->IsExceptionPending()); // OOME. 2116 return; 2117 } 2118 klass->SetVirtualMethod(i, method.Get()); 2119 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2120 if (oat_class != nullptr) { 2121 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2122 } 2123 class_def_method_index++; 2124 } 2125 DCHECK(!it.HasNext()); 2126} 2127 2128void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2129 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2130 uint32_t field_idx = it.GetMemberIndex(); 2131 dst->SetDexFieldIndex(field_idx); 2132 dst->SetDeclaringClass(klass.Get()); 2133 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2134} 2135 2136mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2137 const ClassDataItemIterator& it, 2138 Handle<mirror::Class> klass) { 2139 uint32_t dex_method_idx = it.GetMemberIndex(); 2140 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2141 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2142 2143 mirror::ArtMethod* dst = AllocArtMethod(self); 2144 if (UNLIKELY(dst == NULL)) { 2145 CHECK(self->IsExceptionPending()); // OOME. 2146 return NULL; 2147 } 2148 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2149 2150 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2151 dst->SetDexMethodIndex(dex_method_idx); 2152 dst->SetDeclaringClass(klass.Get()); 2153 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2154 2155 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2156 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2157 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2158 2159 uint32_t access_flags = it.GetMemberAccessFlags(); 2160 2161 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2162 // Set finalizable flag on declaring class. 2163 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2164 // Void return type. 2165 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 2166 klass->SetFinalizable(); 2167 } else { 2168 std::string klass_descriptor = klass->GetDescriptor(); 2169 // The Enum class declares a "final" finalize() method to prevent subclasses from 2170 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2171 // subclasses, so we exclude it here. 2172 // We also want to avoid setting the flag on Object, where we know that finalize() is 2173 // empty. 2174 if (klass_descriptor.compare("Ljava/lang/Object;") != 0 && 2175 klass_descriptor.compare("Ljava/lang/Enum;") != 0) { 2176 klass->SetFinalizable(); 2177 } 2178 } 2179 } 2180 } else if (method_name[0] == '<') { 2181 // Fix broken access flags for initializers. Bug 11157540. 2182 bool is_init = (strcmp("<init>", method_name) == 0); 2183 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2184 if (UNLIKELY(!is_init && !is_clinit)) { 2185 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2186 } else { 2187 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2188 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2189 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2190 access_flags |= kAccConstructor; 2191 } 2192 } 2193 } 2194 dst->SetAccessFlags(access_flags); 2195 2196 self->EndAssertNoThreadSuspension(old_cause); 2197 return dst; 2198} 2199 2200void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2201 Thread* self = Thread::Current(); 2202 StackHandleScope<1> hs(self); 2203 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2204 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2205 AppendToBootClassPath(dex_file, dex_cache); 2206} 2207 2208void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2209 Handle<mirror::DexCache> dex_cache) { 2210 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2211 boot_class_path_.push_back(&dex_file); 2212 RegisterDexFile(dex_file, dex_cache); 2213} 2214 2215bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2216 dex_lock_.AssertSharedHeld(Thread::Current()); 2217 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2218 mirror::DexCache* dex_cache = GetDexCache(i); 2219 if (dex_cache->GetDexFile() == &dex_file) { 2220 return true; 2221 } 2222 } 2223 return false; 2224} 2225 2226bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2227 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2228 return IsDexFileRegisteredLocked(dex_file); 2229} 2230 2231void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2232 Handle<mirror::DexCache> dex_cache) { 2233 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2234 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2235 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2236 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2237 dex_caches_.push_back(dex_cache.Get()); 2238 dex_cache->SetDexFile(&dex_file); 2239 if (log_new_dex_caches_roots_) { 2240 // TODO: This is not safe if we can remove dex caches. 2241 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2242 } 2243} 2244 2245void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2246 Thread* self = Thread::Current(); 2247 { 2248 ReaderMutexLock mu(self, dex_lock_); 2249 if (IsDexFileRegisteredLocked(dex_file)) { 2250 return; 2251 } 2252 } 2253 // Don't alloc while holding the lock, since allocation may need to 2254 // suspend all threads and another thread may need the dex_lock_ to 2255 // get to a suspend point. 2256 StackHandleScope<1> hs(self); 2257 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2258 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2259 { 2260 WriterMutexLock mu(self, dex_lock_); 2261 if (IsDexFileRegisteredLocked(dex_file)) { 2262 return; 2263 } 2264 RegisterDexFileLocked(dex_file, dex_cache); 2265 } 2266} 2267 2268void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2269 Handle<mirror::DexCache> dex_cache) { 2270 WriterMutexLock mu(Thread::Current(), dex_lock_); 2271 RegisterDexFileLocked(dex_file, dex_cache); 2272} 2273 2274mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2275 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2276 // Search assuming unique-ness of dex file. 2277 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2278 mirror::DexCache* dex_cache = GetDexCache(i); 2279 if (dex_cache->GetDexFile() == &dex_file) { 2280 return dex_cache; 2281 } 2282 } 2283 // Search matching by location name. 2284 std::string location(dex_file.GetLocation()); 2285 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2286 mirror::DexCache* dex_cache = GetDexCache(i); 2287 if (dex_cache->GetDexFile()->GetLocation() == location) { 2288 return dex_cache; 2289 } 2290 } 2291 // Failure, dump diagnostic and abort. 2292 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2293 mirror::DexCache* dex_cache = GetDexCache(i); 2294 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2295 } 2296 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2297 return NULL; 2298} 2299 2300void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2301 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2302 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2303 mirror::DexCache* dex_cache = GetDexCache(i); 2304 dex_cache->Fixup(resolution_method); 2305 } 2306} 2307 2308mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2309 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2310 if (UNLIKELY(klass == NULL)) { 2311 return NULL; 2312 } 2313 return InitializePrimitiveClass(klass, type); 2314} 2315 2316mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2317 Primitive::Type type) { 2318 CHECK(primitive_class != NULL); 2319 // Must hold lock on object when initializing. 2320 Thread* self = Thread::Current(); 2321 StackHandleScope<1> hs(self); 2322 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2323 ObjectLock<mirror::Class> lock(self, h_class); 2324 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2325 primitive_class->SetPrimitiveType(type); 2326 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2327 const char* descriptor = Primitive::Descriptor(type); 2328 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2329 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2330 return primitive_class; 2331} 2332 2333// Create an array class (i.e. the class object for the array, not the 2334// array itself). "descriptor" looks like "[C" or "[[[[B" or 2335// "[Ljava/lang/String;". 2336// 2337// If "descriptor" refers to an array of primitives, look up the 2338// primitive type's internally-generated class object. 2339// 2340// "class_loader" is the class loader of the class that's referring to 2341// us. It's used to ensure that we're looking for the element type in 2342// the right context. It does NOT become the class loader for the 2343// array class; that always comes from the base element class. 2344// 2345// Returns NULL with an exception raised on failure. 2346mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2347 Handle<mirror::ClassLoader> class_loader) { 2348 // Identify the underlying component type 2349 CHECK_EQ('[', descriptor[0]); 2350 StackHandleScope<2> hs(self); 2351 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2352 if (component_type.Get() == nullptr) { 2353 DCHECK(self->IsExceptionPending()); 2354 return nullptr; 2355 } 2356 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2357 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2358 return nullptr; 2359 } 2360 // See if the component type is already loaded. Array classes are 2361 // always associated with the class loader of their underlying 2362 // element type -- an array of Strings goes with the loader for 2363 // java/lang/String -- so we need to look for it there. (The 2364 // caller should have checked for the existence of the class 2365 // before calling here, but they did so with *their* class loader, 2366 // not the component type's loader.) 2367 // 2368 // If we find it, the caller adds "loader" to the class' initiating 2369 // loader list, which should prevent us from going through this again. 2370 // 2371 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2372 // are the same, because our caller (FindClass) just did the 2373 // lookup. (Even if we get this wrong we still have correct behavior, 2374 // because we effectively do this lookup again when we add the new 2375 // class to the hash table --- necessary because of possible races with 2376 // other threads.) 2377 if (class_loader.Get() != component_type->GetClassLoader()) { 2378 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2379 if (new_class != NULL) { 2380 return new_class; 2381 } 2382 } 2383 2384 // Fill out the fields in the Class. 2385 // 2386 // It is possible to execute some methods against arrays, because 2387 // all arrays are subclasses of java_lang_Object_, so we need to set 2388 // up a vtable. We can just point at the one in java_lang_Object_. 2389 // 2390 // Array classes are simple enough that we don't need to do a full 2391 // link step. 2392 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2393 if (UNLIKELY(!init_done_)) { 2394 // Classes that were hand created, ie not by FindSystemClass 2395 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2396 new_class.Assign(GetClassRoot(kClassArrayClass)); 2397 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2398 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2399 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2400 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2401 } else if (strcmp(descriptor, 2402 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2403 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2404 } else if (strcmp(descriptor, 2405 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2406 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2407 } else if (strcmp(descriptor, "[C") == 0) { 2408 new_class.Assign(GetClassRoot(kCharArrayClass)); 2409 } else if (strcmp(descriptor, "[I") == 0) { 2410 new_class.Assign(GetClassRoot(kIntArrayClass)); 2411 } 2412 } 2413 if (new_class.Get() == nullptr) { 2414 new_class.Assign(AllocClass(self, sizeof(mirror::Class))); 2415 if (new_class.Get() == nullptr) { 2416 return nullptr; 2417 } 2418 new_class->SetComponentType(component_type.Get()); 2419 } 2420 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2421 DCHECK(new_class->GetComponentType() != NULL); 2422 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2423 new_class->SetSuperClass(java_lang_Object); 2424 new_class->SetVTable(java_lang_Object->GetVTable()); 2425 new_class->SetPrimitiveType(Primitive::kPrimNot); 2426 new_class->SetClassLoader(component_type->GetClassLoader()); 2427 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2428 // don't need to set new_class->SetObjectSize(..) 2429 // because Object::SizeOf delegates to Array::SizeOf 2430 2431 2432 // All arrays have java/lang/Cloneable and java/io/Serializable as 2433 // interfaces. We need to set that up here, so that stuff like 2434 // "instanceof" works right. 2435 // 2436 // Note: The GC could run during the call to FindSystemClass, 2437 // so we need to make sure the class object is GC-valid while we're in 2438 // there. Do this by clearing the interface list so the GC will just 2439 // think that the entries are null. 2440 2441 2442 // Use the single, global copies of "interfaces" and "iftable" 2443 // (remember not to free them for arrays). 2444 { 2445 mirror::IfTable* array_iftable = 2446 ReadBarrier::BarrierForRoot<mirror::IfTable, kWithReadBarrier>(&array_iftable_); 2447 CHECK(array_iftable != nullptr); 2448 new_class->SetIfTable(array_iftable); 2449 } 2450 2451 // Inherit access flags from the component type. 2452 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2453 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2454 access_flags &= kAccJavaFlagsMask; 2455 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2456 // and remove "interface". 2457 access_flags |= kAccAbstract | kAccFinal; 2458 access_flags &= ~kAccInterface; 2459 2460 new_class->SetAccessFlags(access_flags); 2461 2462 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2463 if (existing == nullptr) { 2464 return new_class.Get(); 2465 } 2466 // Another thread must have loaded the class after we 2467 // started but before we finished. Abandon what we've 2468 // done. 2469 // 2470 // (Yes, this happens.) 2471 2472 return existing; 2473} 2474 2475mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2476 switch (type) { 2477 case 'B': 2478 return GetClassRoot(kPrimitiveByte); 2479 case 'C': 2480 return GetClassRoot(kPrimitiveChar); 2481 case 'D': 2482 return GetClassRoot(kPrimitiveDouble); 2483 case 'F': 2484 return GetClassRoot(kPrimitiveFloat); 2485 case 'I': 2486 return GetClassRoot(kPrimitiveInt); 2487 case 'J': 2488 return GetClassRoot(kPrimitiveLong); 2489 case 'S': 2490 return GetClassRoot(kPrimitiveShort); 2491 case 'Z': 2492 return GetClassRoot(kPrimitiveBoolean); 2493 case 'V': 2494 return GetClassRoot(kPrimitiveVoid); 2495 default: 2496 break; 2497 } 2498 std::string printable_type(PrintableChar(type)); 2499 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2500 return NULL; 2501} 2502 2503mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2504 size_t hash) { 2505 if (VLOG_IS_ON(class_linker)) { 2506 mirror::DexCache* dex_cache = klass->GetDexCache(); 2507 std::string source; 2508 if (dex_cache != NULL) { 2509 source += " from "; 2510 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2511 } 2512 LOG(INFO) << "Loaded class " << descriptor << source; 2513 } 2514 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2515 mirror::Class* existing = 2516 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2517 if (existing != NULL) { 2518 return existing; 2519 } 2520 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2521 // Check a class loaded with the system class loader matches one in the image if the class 2522 // is in the image. 2523 existing = LookupClassFromImage(descriptor); 2524 if (existing != NULL) { 2525 CHECK(klass == existing); 2526 } 2527 } 2528 VerifyObject(klass); 2529 class_table_.insert(std::make_pair(hash, klass)); 2530 if (log_new_class_table_roots_) { 2531 new_class_roots_.push_back(std::make_pair(hash, klass)); 2532 } 2533 return NULL; 2534} 2535 2536bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2537 size_t hash = Hash(descriptor); 2538 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2539 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2540 it != end && it->first == hash; 2541 ++it) { 2542 mirror::Class** root = &it->second; 2543 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2544 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2545 class_table_.erase(it); 2546 return true; 2547 } 2548 } 2549 return false; 2550} 2551 2552mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2553 const mirror::ClassLoader* class_loader) { 2554 size_t hash = Hash(descriptor); 2555 { 2556 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2557 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2558 if (result != NULL) { 2559 return result; 2560 } 2561 } 2562 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2563 return NULL; 2564 } else { 2565 // Lookup failed but need to search dex_caches_. 2566 mirror::Class* result = LookupClassFromImage(descriptor); 2567 if (result != NULL) { 2568 InsertClass(descriptor, result, hash); 2569 } else { 2570 // Searching the image dex files/caches failed, we don't want to get into this situation 2571 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2572 // classes into the class table. 2573 const int32_t kMaxFailedDexCacheLookups = 1000; 2574 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2575 MoveImageClassesToClassTable(); 2576 } 2577 } 2578 return result; 2579 } 2580} 2581 2582mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2583 const mirror::ClassLoader* class_loader, 2584 size_t hash) { 2585 auto end = class_table_.end(); 2586 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2587 mirror::Class** root = &it->second; 2588 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2589 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2590 if (kIsDebugBuild) { 2591 // Check for duplicates in the table. 2592 for (++it; it != end && it->first == hash; ++it) { 2593 mirror::Class** root2 = &it->second; 2594 mirror::Class* klass2 = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root2); 2595 CHECK(!(klass2->GetClassLoader() == class_loader && 2596 klass2->DescriptorEquals(descriptor))) 2597 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2598 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2599 } 2600 } 2601 return klass; 2602 } 2603 } 2604 return NULL; 2605} 2606 2607static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2608 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2609 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2610 CHECK(image != NULL); 2611 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2612 return root->AsObjectArray<mirror::DexCache>(); 2613} 2614 2615void ClassLinker::MoveImageClassesToClassTable() { 2616 Thread* self = Thread::Current(); 2617 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2618 if (!dex_cache_image_class_lookup_required_) { 2619 return; // All dex cache classes are already in the class table. 2620 } 2621 const char* old_no_suspend_cause = 2622 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2623 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2624 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2625 mirror::DexCache* dex_cache = dex_caches->Get(i); 2626 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2627 for (int32_t j = 0; j < types->GetLength(); j++) { 2628 mirror::Class* klass = types->Get(j); 2629 if (klass != NULL) { 2630 DCHECK(klass->GetClassLoader() == NULL); 2631 std::string descriptor = klass->GetDescriptor(); 2632 size_t hash = Hash(descriptor.c_str()); 2633 mirror::Class* existing = LookupClassFromTableLocked(descriptor.c_str(), NULL, hash); 2634 if (existing != NULL) { 2635 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2636 << PrettyClassAndClassLoader(klass); 2637 } else { 2638 class_table_.insert(std::make_pair(hash, klass)); 2639 if (log_new_class_table_roots_) { 2640 new_class_roots_.push_back(std::make_pair(hash, klass)); 2641 } 2642 } 2643 } 2644 } 2645 } 2646 dex_cache_image_class_lookup_required_ = false; 2647 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2648} 2649 2650mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2651 Thread* self = Thread::Current(); 2652 const char* old_no_suspend_cause = 2653 self->StartAssertNoThreadSuspension("Image class lookup"); 2654 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2655 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2656 mirror::DexCache* dex_cache = dex_caches->Get(i); 2657 const DexFile* dex_file = dex_cache->GetDexFile(); 2658 // Try binary searching the string/type index. 2659 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2660 if (string_id != NULL) { 2661 const DexFile::TypeId* type_id = 2662 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2663 if (type_id != NULL) { 2664 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2665 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2666 if (klass != NULL) { 2667 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2668 return klass; 2669 } 2670 } 2671 } 2672 } 2673 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2674 return NULL; 2675} 2676 2677void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2678 result.clear(); 2679 if (dex_cache_image_class_lookup_required_) { 2680 MoveImageClassesToClassTable(); 2681 } 2682 size_t hash = Hash(descriptor); 2683 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2684 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2685 it != end && it->first == hash; ++it) { 2686 mirror::Class** root = &it->second; 2687 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2688 if (klass->DescriptorEquals(descriptor)) { 2689 result.push_back(klass); 2690 } 2691 } 2692} 2693 2694void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 2695 // TODO: assert that the monitor on the Class is held 2696 Thread* self = Thread::Current(); 2697 ObjectLock<mirror::Class> lock(self, klass); 2698 2699 // Don't attempt to re-verify if already sufficiently verified. 2700 if (klass->IsVerified() || 2701 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2702 return; 2703 } 2704 2705 // The class might already be erroneous, for example at compile time if we attempted to verify 2706 // this class as a parent to another. 2707 if (klass->IsErroneous()) { 2708 ThrowEarlierClassFailure(klass.Get()); 2709 return; 2710 } 2711 2712 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2713 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2714 } else { 2715 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2716 << PrettyClass(klass.Get()); 2717 CHECK(!Runtime::Current()->IsCompiler()); 2718 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2719 } 2720 2721 // Skip verification if disabled. 2722 if (!Runtime::Current()->IsVerificationEnabled()) { 2723 klass->SetStatus(mirror::Class::kStatusVerified, self); 2724 return; 2725 } 2726 2727 // Verify super class. 2728 StackHandleScope<2> hs(self); 2729 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 2730 if (super.Get() != NULL) { 2731 // Acquire lock to prevent races on verifying the super class. 2732 ObjectLock<mirror::Class> lock(self, super); 2733 2734 if (!super->IsVerified() && !super->IsErroneous()) { 2735 VerifyClass(super); 2736 } 2737 if (!super->IsCompileTimeVerified()) { 2738 std::string error_msg( 2739 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2740 PrettyDescriptor(klass.Get()).c_str(), 2741 PrettyDescriptor(super.Get()).c_str())); 2742 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2743 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 2744 if (cause.Get() != nullptr) { 2745 self->ClearException(); 2746 } 2747 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2748 if (cause.Get() != nullptr) { 2749 self->GetException(nullptr)->SetCause(cause.Get()); 2750 } 2751 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2752 if (Runtime::Current()->IsCompiler()) { 2753 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2754 } 2755 klass->SetStatus(mirror::Class::kStatusError, self); 2756 return; 2757 } 2758 } 2759 2760 // Try to use verification information from the oat file, otherwise do runtime verification. 2761 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2762 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2763 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 2764 if (oat_file_class_status == mirror::Class::kStatusError) { 2765 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2766 << PrettyDescriptor(klass.Get()) << " in " 2767 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2768 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 2769 PrettyDescriptor(klass.Get()).c_str()); 2770 klass->SetStatus(mirror::Class::kStatusError, self); 2771 return; 2772 } 2773 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2774 std::string error_msg; 2775 if (!preverified) { 2776 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 2777 Runtime::Current()->IsCompiler(), 2778 &error_msg); 2779 } 2780 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2781 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2782 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 2783 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2784 << " because: " << error_msg; 2785 } 2786 self->AssertNoPendingException(); 2787 // Make sure all classes referenced by catch blocks are resolved. 2788 ResolveClassExceptionHandlerTypes(dex_file, klass); 2789 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2790 // Even though there were no verifier failures we need to respect whether the super-class 2791 // was verified or requiring runtime reverification. 2792 if (super.Get() == NULL || super->IsVerified()) { 2793 klass->SetStatus(mirror::Class::kStatusVerified, self); 2794 } else { 2795 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2796 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2797 // Pretend a soft failure occured so that we don't consider the class verified below. 2798 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2799 } 2800 } else { 2801 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2802 // Soft failures at compile time should be retried at runtime. Soft 2803 // failures at runtime will be handled by slow paths in the generated 2804 // code. Set status accordingly. 2805 if (Runtime::Current()->IsCompiler()) { 2806 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2807 } else { 2808 klass->SetStatus(mirror::Class::kStatusVerified, self); 2809 } 2810 } 2811 } else { 2812 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 2813 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2814 << " because: " << error_msg; 2815 self->AssertNoPendingException(); 2816 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2817 klass->SetStatus(mirror::Class::kStatusError, self); 2818 } 2819 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2820 // Class is verified so we don't need to do any access check on its methods. 2821 // Let the interpreter know it by setting the kAccPreverified flag onto each 2822 // method. 2823 // Note: we're going here during compilation and at runtime. When we set the 2824 // kAccPreverified flag when compiling image classes, the flag is recorded 2825 // in the image and is set when loading the image. 2826 klass->SetPreverifiedFlagOnAllMethods(); 2827 } 2828} 2829 2830bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2831 mirror::Class::Status& oat_file_class_status) { 2832 // If we're compiling, we can only verify the class using the oat file if 2833 // we are not compiling the image or if the class we're verifying is not part of 2834 // the app. In other words, we will only check for preverification of bootclasspath 2835 // classes. 2836 if (Runtime::Current()->IsCompiler()) { 2837 // Are we compiling the bootclasspath? 2838 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2839 return false; 2840 } 2841 // We are compiling an app (not the image). 2842 2843 // Is this an app class? (I.e. not a bootclasspath class) 2844 if (klass->GetClassLoader() != NULL) { 2845 return false; 2846 } 2847 } 2848 2849 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2850 // Make this work with gtests, which do not set up the image properly. 2851 // TODO: we should clean up gtests to set up the image path properly. 2852 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2853 return false; 2854 } 2855 2856 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2857 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2858 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2859 &dex_location_checksum); 2860 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2861 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2862 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 2863 if (oat_file_class_status == mirror::Class::kStatusVerified || 2864 oat_file_class_status == mirror::Class::kStatusInitialized) { 2865 return true; 2866 } 2867 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2868 // Compile time verification failed with a soft error. Compile time verification can fail 2869 // because we have incomplete type information. Consider the following: 2870 // class ... { 2871 // Foo x; 2872 // .... () { 2873 // if (...) { 2874 // v1 gets assigned a type of resolved class Foo 2875 // } else { 2876 // v1 gets assigned a type of unresolved class Bar 2877 // } 2878 // iput x = v1 2879 // } } 2880 // when we merge v1 following the if-the-else it results in Conflict 2881 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2882 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2883 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2884 // at compile time). 2885 return false; 2886 } 2887 if (oat_file_class_status == mirror::Class::kStatusError) { 2888 // Compile time verification failed with a hard error. This is caused by invalid instructions 2889 // in the class. These errors are unrecoverable. 2890 return false; 2891 } 2892 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2893 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2894 // not loading the class. 2895 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2896 // isn't a problem and this case shouldn't occur 2897 return false; 2898 } 2899 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2900 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2901 << klass->GetDescriptor(); 2902 2903 return false; 2904} 2905 2906void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2907 Handle<mirror::Class> klass) { 2908 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2909 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2910 } 2911 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2912 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2913 } 2914} 2915 2916void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2917 mirror::ArtMethod* method) { 2918 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2919 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2920 if (code_item == NULL) { 2921 return; // native or abstract method 2922 } 2923 if (code_item->tries_size_ == 0) { 2924 return; // nothing to process 2925 } 2926 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2927 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2928 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2929 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2930 CatchHandlerIterator iterator(handlers_ptr); 2931 for (; iterator.HasNext(); iterator.Next()) { 2932 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2933 // unresolved exception types will be ignored by exception delivery 2934 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2935 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2936 if (exception_type == NULL) { 2937 DCHECK(Thread::Current()->IsExceptionPending()); 2938 Thread::Current()->ClearException(); 2939 } 2940 } 2941 } 2942 handlers_ptr = iterator.EndDataPointer(); 2943 } 2944} 2945 2946static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2947static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 2948 Handle<mirror::ArtMethod> prototype); 2949 2950mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 2951 jobjectArray interfaces, jobject loader, 2952 jobjectArray methods, jobjectArray throws) { 2953 Thread* self = soa.Self(); 2954 StackHandleScope<8> hs(self); 2955 Handle<mirror::Class> klass(hs.NewHandle(AllocClass(self, GetClassRoot(kJavaLangClass), 2956 sizeof(mirror::SynthesizedProxyClass)))); 2957 if (klass.Get() == NULL) { 2958 CHECK(self->IsExceptionPending()); // OOME. 2959 return NULL; 2960 } 2961 DCHECK(klass->GetClass() != NULL); 2962 klass->SetObjectSize(sizeof(mirror::Proxy)); 2963 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2964 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2965 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2966 klass->SetName(soa.Decode<mirror::String*>(name)); 2967 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2968 klass->SetDexCache(proxy_class->GetDexCache()); 2969 klass->SetStatus(mirror::Class::kStatusIdx, self); 2970 2971 // Instance fields are inherited, but we add a couple of static fields... 2972 { 2973 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2974 if (UNLIKELY(sfields == NULL)) { 2975 CHECK(self->IsExceptionPending()); // OOME. 2976 return NULL; 2977 } 2978 klass->SetSFields(sfields); 2979 } 2980 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2981 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2982 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 2983 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 2984 CHECK(self->IsExceptionPending()); // OOME. 2985 return nullptr; 2986 } 2987 klass->SetStaticField(0, interfaces_sfield.Get()); 2988 interfaces_sfield->SetDexFieldIndex(0); 2989 interfaces_sfield->SetDeclaringClass(klass.Get()); 2990 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2991 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2992 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 2993 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 2994 CHECK(self->IsExceptionPending()); // OOME. 2995 return nullptr; 2996 } 2997 klass->SetStaticField(1, throws_sfield.Get()); 2998 throws_sfield->SetDexFieldIndex(1); 2999 throws_sfield->SetDeclaringClass(klass.Get()); 3000 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3001 3002 // Proxies have 1 direct method, the constructor 3003 { 3004 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3005 if (UNLIKELY(directs == nullptr)) { 3006 CHECK(self->IsExceptionPending()); // OOME. 3007 return nullptr; 3008 } 3009 klass->SetDirectMethods(directs); 3010 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3011 if (UNLIKELY(constructor == nullptr)) { 3012 CHECK(self->IsExceptionPending()); // OOME. 3013 return nullptr; 3014 } 3015 klass->SetDirectMethod(0, constructor); 3016 } 3017 3018 // Create virtual method using specified prototypes. 3019 size_t num_virtual_methods = 3020 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3021 { 3022 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3023 num_virtual_methods); 3024 if (UNLIKELY(virtuals == NULL)) { 3025 CHECK(self->IsExceptionPending()); // OOME. 3026 return NULL; 3027 } 3028 klass->SetVirtualMethods(virtuals); 3029 } 3030 for (size_t i = 0; i < num_virtual_methods; ++i) { 3031 StackHandleScope<1> hs(self); 3032 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3033 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3034 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3035 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3036 if (UNLIKELY(clone == nullptr)) { 3037 CHECK(self->IsExceptionPending()); // OOME. 3038 return nullptr; 3039 } 3040 klass->SetVirtualMethod(i, clone); 3041 } 3042 3043 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3044 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3045 self->AssertNoPendingException(); 3046 3047 { 3048 ObjectLock<mirror::Class> lock(self, klass); // Must hold lock on object when resolved. 3049 // Link the fields and virtual methods, creating vtable and iftables 3050 Handle<mirror::ObjectArray<mirror::Class>> h_interfaces( 3051 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3052 if (!LinkClass(self, klass, h_interfaces)) { 3053 klass->SetStatus(mirror::Class::kStatusError, self); 3054 return nullptr; 3055 } 3056 3057 interfaces_sfield->SetObject<false>( 3058 klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3059 throws_sfield->SetObject<false>( 3060 klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3061 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3062 } 3063 3064 // sanity checks 3065 if (kIsDebugBuild) { 3066 CHECK(klass->GetIFields() == nullptr); 3067 CheckProxyConstructor(klass->GetDirectMethod(0)); 3068 for (size_t i = 0; i < num_virtual_methods; ++i) { 3069 StackHandleScope<2> hs(self); 3070 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3071 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3072 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3073 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3074 CheckProxyMethod(virtual_method, prototype); 3075 } 3076 3077 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3078 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3079 decoded_name->ToModifiedUtf8().c_str())); 3080 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3081 3082 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3083 decoded_name->ToModifiedUtf8().c_str())); 3084 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3085 3086 mirror::SynthesizedProxyClass* synth_proxy_class = 3087 down_cast<mirror::SynthesizedProxyClass*>(klass.Get()); 3088 CHECK_EQ(synth_proxy_class->GetInterfaces(), 3089 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3090 CHECK_EQ(synth_proxy_class->GetThrows(), 3091 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3092 } 3093 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3094 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3095 CHECK(existing == nullptr); 3096 return klass.Get(); 3097} 3098 3099std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3100 DCHECK(proxy_class->IsProxyClass()); 3101 mirror::String* name = proxy_class->GetName(); 3102 DCHECK(name != NULL); 3103 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3104} 3105 3106mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3107 mirror::ArtMethod* proxy_method) { 3108 DCHECK(proxy_class->IsProxyClass()); 3109 DCHECK(proxy_method->IsProxyMethod()); 3110 // Locate the dex cache of the original interface/Object 3111 mirror::DexCache* dex_cache = NULL; 3112 { 3113 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 3114 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3115 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3116 mirror::DexCache* a_dex_cache = GetDexCache(i); 3117 if (a_dex_cache->GetResolvedTypes() == resolved_types) { 3118 dex_cache = a_dex_cache; 3119 break; 3120 } 3121 } 3122 } 3123 CHECK(dex_cache != NULL); 3124 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3125 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3126 CHECK(resolved_method != NULL); 3127 return resolved_method; 3128} 3129 3130 3131mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3132 Handle<mirror::Class> klass, 3133 mirror::Class* proxy_class) { 3134 // Create constructor for Proxy that must initialize h 3135 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3136 proxy_class->GetDirectMethods(); 3137 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3138 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3139 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3140 // code_ too) 3141 mirror::ArtMethod* constructor = 3142 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3143 if (constructor == NULL) { 3144 CHECK(self->IsExceptionPending()); // OOME. 3145 return NULL; 3146 } 3147 // Make this constructor public and fix the class to be our Proxy version 3148 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3149 constructor->SetDeclaringClass(klass.Get()); 3150 return constructor; 3151} 3152 3153static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3154 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3155 CHECK(constructor->IsConstructor()); 3156 CHECK_STREQ(constructor->GetName(), "<init>"); 3157 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3158 "(Ljava/lang/reflect/InvocationHandler;)V"); 3159 DCHECK(constructor->IsPublic()); 3160} 3161 3162mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3163 Handle<mirror::Class> klass, 3164 Handle<mirror::ArtMethod> prototype) { 3165 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3166 // prototype method 3167 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3168 prototype.Get()); 3169 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3170 // as necessary 3171 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3172 if (UNLIKELY(method == NULL)) { 3173 CHECK(self->IsExceptionPending()); // OOME. 3174 return NULL; 3175 } 3176 3177 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3178 // the intersection of throw exceptions as defined in Proxy 3179 method->SetDeclaringClass(klass.Get()); 3180 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3181 3182 // At runtime the method looks like a reference and argument saving method, clone the code 3183 // related parameters from this method. 3184 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3185 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3186 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3187 3188 return method; 3189} 3190 3191static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3192 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3193 // Basic sanity 3194 CHECK(!prototype->IsFinal()); 3195 CHECK(method->IsFinal()); 3196 CHECK(!method->IsAbstract()); 3197 3198 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3199 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3200 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3201 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 3202 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 3203 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3204 3205 MethodHelper mh(method); 3206 MethodHelper mh2(prototype); 3207 CHECK_STREQ(method->GetName(), prototype->GetName()); 3208 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3209 // More complex sanity - via dex cache 3210 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3211} 3212 3213static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3214 bool can_init_parents) 3215 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3216 if (can_init_statics && can_init_parents) { 3217 return true; 3218 } 3219 if (!can_init_statics) { 3220 // Check if there's a class initializer. 3221 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3222 if (clinit != NULL) { 3223 return false; 3224 } 3225 // Check if there are encoded static values needing initialization. 3226 if (klass->NumStaticFields() != 0) { 3227 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3228 DCHECK(dex_class_def != NULL); 3229 if (dex_class_def->static_values_off_ != 0) { 3230 return false; 3231 } 3232 } 3233 } 3234 if (!klass->IsInterface() && klass->HasSuperClass()) { 3235 mirror::Class* super_class = klass->GetSuperClass(); 3236 if (!can_init_parents && !super_class->IsInitialized()) { 3237 return false; 3238 } else { 3239 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3240 return false; 3241 } 3242 } 3243 } 3244 return true; 3245} 3246 3247bool ClassLinker::IsInitialized() const { 3248 return init_done_; 3249} 3250 3251bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3252 bool can_init_parents) { 3253 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3254 3255 // Are we already initialized and therefore done? 3256 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3257 // an initialized class will never change its state. 3258 if (klass->IsInitialized()) { 3259 return true; 3260 } 3261 3262 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3263 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3264 return false; 3265 } 3266 3267 Thread* self = Thread::Current(); 3268 uint64_t t0; 3269 { 3270 ObjectLock<mirror::Class> lock(self, klass); 3271 3272 // Re-check under the lock in case another thread initialized ahead of us. 3273 if (klass->IsInitialized()) { 3274 return true; 3275 } 3276 3277 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3278 if (klass->IsErroneous()) { 3279 ThrowEarlierClassFailure(klass.Get()); 3280 return false; 3281 } 3282 3283 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3284 3285 if (!klass->IsVerified()) { 3286 VerifyClass(klass); 3287 if (!klass->IsVerified()) { 3288 // We failed to verify, expect either the klass to be erroneous or verification failed at 3289 // compile time. 3290 if (klass->IsErroneous()) { 3291 CHECK(self->IsExceptionPending()); 3292 } else { 3293 CHECK(Runtime::Current()->IsCompiler()); 3294 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3295 } 3296 return false; 3297 } 3298 } 3299 3300 // If the class is kStatusInitializing, either this thread is 3301 // initializing higher up the stack or another thread has beat us 3302 // to initializing and we need to wait. Either way, this 3303 // invocation of InitializeClass will not be responsible for 3304 // running <clinit> and will return. 3305 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3306 // We caught somebody else in the act; was it us? 3307 if (klass->GetClinitThreadId() == self->GetTid()) { 3308 // Yes. That's fine. Return so we can continue initializing. 3309 return true; 3310 } 3311 // No. That's fine. Wait for another thread to finish initializing. 3312 return WaitForInitializeClass(klass, self, lock); 3313 } 3314 3315 if (!ValidateSuperClassDescriptors(klass)) { 3316 klass->SetStatus(mirror::Class::kStatusError, self); 3317 return false; 3318 } 3319 3320 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3321 3322 // From here out other threads may observe that we're initializing and so changes of state 3323 // require the a notification. 3324 klass->SetClinitThreadId(self->GetTid()); 3325 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3326 3327 t0 = NanoTime(); 3328 } 3329 3330 // Initialize super classes, must be done while initializing for the JLS. 3331 if (!klass->IsInterface() && klass->HasSuperClass()) { 3332 mirror::Class* super_class = klass->GetSuperClass(); 3333 if (!super_class->IsInitialized()) { 3334 CHECK(!super_class->IsInterface()); 3335 CHECK(can_init_parents); 3336 StackHandleScope<1> hs(self); 3337 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3338 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3339 if (!super_initialized) { 3340 // The super class was verified ahead of entering initializing, we should only be here if 3341 // the super class became erroneous due to initialization. 3342 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3343 << "Super class initialization failed for " 3344 << PrettyDescriptor(handle_scope_super.Get()) 3345 << " that has unexpected status " << handle_scope_super->GetStatus() 3346 << "\nPending exception:\n" 3347 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3348 ObjectLock<mirror::Class> lock(self, klass); 3349 // Initialization failed because the super-class is erroneous. 3350 klass->SetStatus(mirror::Class::kStatusError, self); 3351 return false; 3352 } 3353 } 3354 } 3355 3356 if (klass->NumStaticFields() > 0) { 3357 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3358 CHECK(dex_class_def != NULL); 3359 const DexFile& dex_file = klass->GetDexFile(); 3360 StackHandleScope<2> hs(self); 3361 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3362 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3363 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3364 this, *dex_class_def); 3365 if (it.HasNext()) { 3366 CHECK(can_init_statics); 3367 // We reordered the fields, so we need to be able to map the 3368 // field indexes to the right fields. 3369 SafeMap<uint32_t, mirror::ArtField*> field_map; 3370 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3371 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3372 if (Runtime::Current()->IsActiveTransaction()) { 3373 it.ReadValueToField<true>(field_map.Get(i)); 3374 } else { 3375 it.ReadValueToField<false>(field_map.Get(i)); 3376 } 3377 } 3378 } 3379 } 3380 3381 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3382 if (clinit != NULL) { 3383 CHECK(can_init_statics); 3384 JValue result; 3385 clinit->Invoke(self, NULL, 0, &result, "V"); 3386 } 3387 3388 uint64_t t1 = NanoTime(); 3389 3390 bool success = true; 3391 { 3392 ObjectLock<mirror::Class> lock(self, klass); 3393 3394 if (self->IsExceptionPending()) { 3395 WrapExceptionInInitializer(); 3396 klass->SetStatus(mirror::Class::kStatusError, self); 3397 success = false; 3398 } else { 3399 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3400 RuntimeStats* thread_stats = self->GetStats(); 3401 ++global_stats->class_init_count; 3402 ++thread_stats->class_init_count; 3403 global_stats->class_init_time_ns += (t1 - t0); 3404 thread_stats->class_init_time_ns += (t1 - t0); 3405 // Set the class as initialized except if failed to initialize static fields. 3406 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3407 if (VLOG_IS_ON(class_linker)) { 3408 LOG(INFO) << "Initialized class " << klass->GetDescriptor() << " from " << 3409 klass->GetLocation(); 3410 } 3411 // Opportunistically set static method trampolines to their destination. 3412 FixupStaticTrampolines(klass.Get()); 3413 } 3414 } 3415 return success; 3416} 3417 3418bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3419 ObjectLock<mirror::Class>& lock) 3420 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3421 while (true) { 3422 self->AssertNoPendingException(); 3423 CHECK(!klass->IsInitialized()); 3424 lock.WaitIgnoringInterrupts(); 3425 3426 // When we wake up, repeat the test for init-in-progress. If 3427 // there's an exception pending (only possible if 3428 // "interruptShouldThrow" was set), bail out. 3429 if (self->IsExceptionPending()) { 3430 WrapExceptionInInitializer(); 3431 klass->SetStatus(mirror::Class::kStatusError, self); 3432 return false; 3433 } 3434 // Spurious wakeup? Go back to waiting. 3435 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3436 continue; 3437 } 3438 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3439 // Compile time initialization failed. 3440 return false; 3441 } 3442 if (klass->IsErroneous()) { 3443 // The caller wants an exception, but it was thrown in a 3444 // different thread. Synthesize one here. 3445 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3446 PrettyDescriptor(klass.Get()).c_str()); 3447 return false; 3448 } 3449 if (klass->IsInitialized()) { 3450 return true; 3451 } 3452 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 3453 << klass->GetStatus(); 3454 } 3455 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 3456} 3457 3458bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 3459 if (klass->IsInterface()) { 3460 return true; 3461 } 3462 // Begin with the methods local to the superclass. 3463 StackHandleScope<2> hs(Thread::Current()); 3464 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3465 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3466 if (klass->HasSuperClass() && 3467 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3468 for (int i = klass->GetSuperClass()->GetVTable()->GetLength() - 1; i >= 0; --i) { 3469 mh.ChangeMethod(klass->GetVTable()->GetWithoutChecks(i)); 3470 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTable()->GetWithoutChecks(i)); 3471 if (mh.GetMethod() != super_mh.GetMethod() && 3472 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3473 ThrowLinkageError(klass.Get(), 3474 "Class %s method %s resolves differently in superclass %s", 3475 PrettyDescriptor(klass.Get()).c_str(), 3476 PrettyMethod(mh.GetMethod()).c_str(), 3477 PrettyDescriptor(klass->GetSuperClass()).c_str()); 3478 return false; 3479 } 3480 } 3481 } 3482 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3483 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 3484 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 3485 for (uint32_t j = 0; j < num_methods; ++j) { 3486 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 3487 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 3488 if (mh.GetMethod() != super_mh.GetMethod() && 3489 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3490 ThrowLinkageError(klass.Get(), 3491 "Class %s method %s resolves differently in interface %s", 3492 PrettyDescriptor(klass.Get()).c_str(), 3493 PrettyMethod(mh.GetMethod()).c_str(), 3494 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 3495 return false; 3496 } 3497 } 3498 } 3499 } 3500 return true; 3501} 3502 3503bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 3504 bool can_init_parents) { 3505 DCHECK(c.Get() != nullptr); 3506 const bool success = c->IsInitialized() || InitializeClass(c, can_init_fields, can_init_parents); 3507 if (!success && can_init_fields && can_init_parents) { 3508 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.Get()); 3509 } 3510 return success; 3511} 3512 3513void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3514 mirror::Class* c, 3515 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3516 const byte* class_data = dex_file.GetClassData(dex_class_def); 3517 ClassDataItemIterator it(dex_file, class_data); 3518 StackHandleScope<2> hs(Thread::Current()); 3519 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 3520 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 3521 CHECK(!kMovingFields); 3522 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3523 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3524 } 3525} 3526 3527bool ClassLinker::LinkClass(Thread* self, Handle<mirror::Class> klass, 3528 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3529 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3530 if (!LinkSuperClass(klass)) { 3531 return false; 3532 } 3533 if (!LinkMethods(self, klass, interfaces)) { 3534 return false; 3535 } 3536 if (!LinkInstanceFields(klass)) { 3537 return false; 3538 } 3539 if (!LinkStaticFields(klass)) { 3540 return false; 3541 } 3542 CreateReferenceInstanceOffsets(klass); 3543 CreateReferenceStaticOffsets(klass); 3544 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3545 klass->SetStatus(mirror::Class::kStatusResolved, self); 3546 return true; 3547} 3548 3549bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 3550 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3551 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3552 uint16_t super_class_idx = class_def.superclass_idx_; 3553 if (super_class_idx != DexFile::kDexNoIndex16) { 3554 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 3555 if (super_class == NULL) { 3556 DCHECK(Thread::Current()->IsExceptionPending()); 3557 return false; 3558 } 3559 // Verify 3560 if (!klass->CanAccess(super_class)) { 3561 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 3562 PrettyDescriptor(super_class).c_str(), 3563 PrettyDescriptor(klass.Get()).c_str()); 3564 return false; 3565 } 3566 klass->SetSuperClass(super_class); 3567 } 3568 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3569 if (interfaces != NULL) { 3570 for (size_t i = 0; i < interfaces->Size(); i++) { 3571 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3572 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 3573 if (interface == NULL) { 3574 DCHECK(Thread::Current()->IsExceptionPending()); 3575 return false; 3576 } 3577 // Verify 3578 if (!klass->CanAccess(interface)) { 3579 // TODO: the RI seemed to ignore this in my testing. 3580 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 3581 PrettyDescriptor(interface).c_str(), 3582 PrettyDescriptor(klass.Get()).c_str()); 3583 return false; 3584 } 3585 } 3586 } 3587 // Mark the class as loaded. 3588 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3589 return true; 3590} 3591 3592bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 3593 CHECK(!klass->IsPrimitive()); 3594 mirror::Class* super = klass->GetSuperClass(); 3595 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 3596 if (super != NULL) { 3597 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 3598 return false; 3599 } 3600 return true; 3601 } 3602 if (super == NULL) { 3603 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 3604 PrettyDescriptor(klass.Get()).c_str()); 3605 return false; 3606 } 3607 // Verify 3608 if (super->IsFinal() || super->IsInterface()) { 3609 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 3610 PrettyDescriptor(super).c_str(), 3611 PrettyDescriptor(klass.Get()).c_str(), 3612 super->IsFinal() ? "declared final" : "an interface"); 3613 return false; 3614 } 3615 if (!klass->CanAccess(super)) { 3616 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 3617 PrettyDescriptor(super).c_str(), 3618 PrettyDescriptor(klass.Get()).c_str()); 3619 return false; 3620 } 3621 3622 // Inherit kAccClassIsFinalizable from the superclass in case this 3623 // class doesn't override finalize. 3624 if (super->IsFinalizable()) { 3625 klass->SetFinalizable(); 3626 } 3627 3628 // Inherit reference flags (if any) from the superclass. 3629 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3630 if (reference_flags != 0) { 3631 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3632 } 3633 // Disallow custom direct subclasses of java.lang.ref.Reference. 3634 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3635 ThrowLinkageError(klass.Get(), 3636 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3637 PrettyDescriptor(klass.Get()).c_str()); 3638 return false; 3639 } 3640 3641 if (kIsDebugBuild) { 3642 // Ensure super classes are fully resolved prior to resolving fields.. 3643 while (super != NULL) { 3644 CHECK(super->IsResolved()); 3645 super = super->GetSuperClass(); 3646 } 3647 } 3648 return true; 3649} 3650 3651// Populate the class vtable and itable. Compute return type indices. 3652bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 3653 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3654 if (klass->IsInterface()) { 3655 // No vtable. 3656 size_t count = klass->NumVirtualMethods(); 3657 if (!IsUint(16, count)) { 3658 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 3659 return false; 3660 } 3661 for (size_t i = 0; i < count; ++i) { 3662 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3663 } 3664 // Link interface method tables 3665 return LinkInterfaceMethods(klass, interfaces); 3666 } else { 3667 // Link virtual and interface method tables 3668 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 3669 } 3670 return true; 3671} 3672 3673bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 3674 if (klass->HasSuperClass()) { 3675 uint32_t max_count = klass->NumVirtualMethods() + 3676 klass->GetSuperClass()->GetVTable()->GetLength(); 3677 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3678 CHECK_LE(actual_count, max_count); 3679 // TODO: do not assign to the vtable field until it is fully constructed. 3680 StackHandleScope<3> hs(self); 3681 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3682 hs.NewHandle(klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count))); 3683 if (UNLIKELY(vtable.Get() == NULL)) { 3684 CHECK(self->IsExceptionPending()); // OOME. 3685 return false; 3686 } 3687 // See if any of our virtual methods override the superclass. 3688 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3689 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3690 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3691 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3692 local_mh.ChangeMethod(local_method); 3693 size_t j = 0; 3694 for (; j < actual_count; ++j) { 3695 mirror::ArtMethod* super_method = vtable->Get(j); 3696 super_mh.ChangeMethod(super_method); 3697 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3698 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 3699 super_method->GetAccessFlags())) { 3700 if (super_method->IsFinal()) { 3701 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 3702 PrettyMethod(local_method).c_str(), 3703 super_method->GetDeclaringClassDescriptor()); 3704 return false; 3705 } 3706 vtable->Set<false>(j, local_method); 3707 local_method->SetMethodIndex(j); 3708 break; 3709 } else { 3710 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3711 << " would have incorrectly overridden the package-private method in " 3712 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 3713 } 3714 } 3715 } 3716 if (j == actual_count) { 3717 // Not overriding, append. 3718 vtable->Set<false>(actual_count, local_method); 3719 local_method->SetMethodIndex(actual_count); 3720 actual_count += 1; 3721 } 3722 } 3723 if (!IsUint(16, actual_count)) { 3724 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 3725 return false; 3726 } 3727 // Shrink vtable if possible 3728 CHECK_LE(actual_count, max_count); 3729 if (actual_count < max_count) { 3730 vtable.Assign(vtable->CopyOf(self, actual_count)); 3731 if (UNLIKELY(vtable.Get() == NULL)) { 3732 CHECK(self->IsExceptionPending()); // OOME. 3733 return false; 3734 } 3735 } 3736 klass->SetVTable(vtable.Get()); 3737 } else { 3738 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 3739 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3740 if (!IsUint(16, num_virtual_methods)) { 3741 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 3742 return false; 3743 } 3744 StackHandleScope<1> hs(self); 3745 Handle<mirror::ObjectArray<mirror::ArtMethod>> 3746 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 3747 if (UNLIKELY(vtable.Get() == NULL)) { 3748 CHECK(self->IsExceptionPending()); // OOME. 3749 return false; 3750 } 3751 for (size_t i = 0; i < num_virtual_methods; ++i) { 3752 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3753 vtable->Set<false>(i, virtual_method); 3754 virtual_method->SetMethodIndex(i & 0xFFFF); 3755 } 3756 klass->SetVTable(vtable.Get()); 3757 } 3758 return true; 3759} 3760 3761bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 3762 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3763 Thread* const self = Thread::Current(); 3764 Runtime* const runtime = Runtime::Current(); 3765 // Set the imt table to be all conflicts by default. 3766 klass->SetImTable(runtime->GetDefaultImt()); 3767 size_t super_ifcount; 3768 if (klass->HasSuperClass()) { 3769 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3770 } else { 3771 super_ifcount = 0; 3772 } 3773 uint32_t num_interfaces = 3774 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 3775 size_t ifcount = super_ifcount + num_interfaces; 3776 for (size_t i = 0; i < num_interfaces; i++) { 3777 mirror::Class* interface = 3778 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 3779 interfaces->Get(i); 3780 ifcount += interface->GetIfTableCount(); 3781 } 3782 if (ifcount == 0) { 3783 // Class implements no interfaces. 3784 DCHECK_EQ(klass->GetIfTableCount(), 0); 3785 DCHECK(klass->GetIfTable() == NULL); 3786 return true; 3787 } 3788 if (ifcount == super_ifcount) { 3789 // Class implements same interfaces as parent, are any of these not marker interfaces? 3790 bool has_non_marker_interface = false; 3791 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3792 for (size_t i = 0; i < ifcount; ++i) { 3793 if (super_iftable->GetMethodArrayCount(i) > 0) { 3794 has_non_marker_interface = true; 3795 break; 3796 } 3797 } 3798 if (!has_non_marker_interface) { 3799 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3800 klass->SetIfTable(super_iftable); 3801 return true; 3802 } 3803 } 3804 StackHandleScope<4> hs(self); 3805 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 3806 if (UNLIKELY(iftable.Get() == NULL)) { 3807 CHECK(self->IsExceptionPending()); // OOME. 3808 return false; 3809 } 3810 if (super_ifcount != 0) { 3811 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3812 for (size_t i = 0; i < super_ifcount; i++) { 3813 mirror::Class* super_interface = super_iftable->GetInterface(i); 3814 iftable->SetInterface(i, super_interface); 3815 } 3816 } 3817 // Flatten the interface inheritance hierarchy. 3818 size_t idx = super_ifcount; 3819 for (size_t i = 0; i < num_interfaces; i++) { 3820 mirror::Class* interface = 3821 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 3822 interfaces->Get(i); 3823 DCHECK(interface != NULL); 3824 if (!interface->IsInterface()) { 3825 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 3826 PrettyDescriptor(klass.Get()).c_str(), 3827 PrettyDescriptor(interface->GetDescriptor()).c_str()); 3828 return false; 3829 } 3830 // Check if interface is already in iftable 3831 bool duplicate = false; 3832 for (size_t j = 0; j < idx; j++) { 3833 mirror::Class* existing_interface = iftable->GetInterface(j); 3834 if (existing_interface == interface) { 3835 duplicate = true; 3836 break; 3837 } 3838 } 3839 if (!duplicate) { 3840 // Add this non-duplicate interface. 3841 iftable->SetInterface(idx++, interface); 3842 // Add this interface's non-duplicate super-interfaces. 3843 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3844 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3845 bool super_duplicate = false; 3846 for (size_t k = 0; k < idx; k++) { 3847 mirror::Class* existing_interface = iftable->GetInterface(k); 3848 if (existing_interface == super_interface) { 3849 super_duplicate = true; 3850 break; 3851 } 3852 } 3853 if (!super_duplicate) { 3854 iftable->SetInterface(idx++, super_interface); 3855 } 3856 } 3857 } 3858 } 3859 // Shrink iftable in case duplicates were found 3860 if (idx < ifcount) { 3861 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3862 if (UNLIKELY(iftable.Get() == NULL)) { 3863 CHECK(self->IsExceptionPending()); // OOME. 3864 return false; 3865 } 3866 ifcount = idx; 3867 } else { 3868 CHECK_EQ(idx, ifcount); 3869 } 3870 klass->SetIfTable(iftable.Get()); 3871 3872 // If we're an interface, we don't need the vtable pointers, so we're done. 3873 if (klass->IsInterface()) { 3874 return true; 3875 } 3876 // Allocate imtable 3877 bool imtable_changed = false; 3878 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 3879 hs.NewHandle(AllocArtMethodArray(self, kImtSize))); 3880 if (UNLIKELY(imtable.Get() == NULL)) { 3881 CHECK(self->IsExceptionPending()); // OOME. 3882 return false; 3883 } 3884 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3885 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3886 std::vector<mirror::ArtMethod*> miranda_list; 3887 for (size_t i = 0; i < ifcount; ++i) { 3888 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 3889 if (num_methods > 0) { 3890 StackHandleScope<2> hs(self); 3891 Handle<mirror::ObjectArray<mirror::ArtMethod>> 3892 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 3893 if (UNLIKELY(method_array.Get() == nullptr)) { 3894 CHECK(self->IsExceptionPending()); // OOME. 3895 return false; 3896 } 3897 iftable->SetMethodArray(i, method_array.Get()); 3898 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3899 hs.NewHandle(klass->GetVTableDuringLinking())); 3900 for (size_t j = 0; j < num_methods; ++j) { 3901 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 3902 interface_mh.ChangeMethod(interface_method); 3903 int32_t k; 3904 // For each method listed in the interface's method list, find the 3905 // matching method in our class's method list. We want to favor the 3906 // subclass over the superclass, which just requires walking 3907 // back from the end of the vtable. (This only matters if the 3908 // superclass defines a private method and this class redefines 3909 // it -- otherwise it would use the same vtable slot. In .dex files 3910 // those don't end up in the virtual method table, so it shouldn't 3911 // matter which direction we go. We walk it backward anyway.) 3912 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3913 mirror::ArtMethod* vtable_method = vtable->Get(k); 3914 vtable_mh.ChangeMethod(vtable_method); 3915 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3916 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3917 ThrowIllegalAccessError( 3918 klass.Get(), 3919 "Method '%s' implementing interface method '%s' is not public", 3920 PrettyMethod(vtable_method).c_str(), 3921 PrettyMethod(interface_method).c_str()); 3922 return false; 3923 } 3924 method_array->Set<false>(j, vtable_method); 3925 // Place method in imt if entry is empty, place conflict otherwise. 3926 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3927 if (imtable->Get(imt_index) == NULL) { 3928 imtable->Set<false>(imt_index, vtable_method); 3929 imtable_changed = true; 3930 } else { 3931 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 3932 } 3933 break; 3934 } 3935 } 3936 if (k < 0) { 3937 StackHandleScope<1> hs(self); 3938 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 3939 for (mirror::ArtMethod* mir_method : miranda_list) { 3940 vtable_mh.ChangeMethod(mir_method); 3941 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3942 miranda_method.Assign(mir_method); 3943 break; 3944 } 3945 } 3946 if (miranda_method.Get() == NULL) { 3947 // Point the interface table at a phantom slot. 3948 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3949 if (UNLIKELY(miranda_method.Get() == NULL)) { 3950 CHECK(self->IsExceptionPending()); // OOME. 3951 return false; 3952 } 3953 // TODO: If a methods move then the miranda_list may hold stale references. 3954 miranda_list.push_back(miranda_method.Get()); 3955 } 3956 method_array->Set<false>(j, miranda_method.Get()); 3957 } 3958 } 3959 } 3960 } 3961 if (imtable_changed) { 3962 // Fill in empty entries in interface method table with conflict. 3963 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 3964 for (size_t i = 0; i < kImtSize; i++) { 3965 if (imtable->Get(i) == NULL) { 3966 imtable->Set<false>(i, imt_conflict_method); 3967 } 3968 } 3969 klass->SetImTable(imtable.Get()); 3970 } 3971 if (!miranda_list.empty()) { 3972 int old_method_count = klass->NumVirtualMethods(); 3973 int new_method_count = old_method_count + miranda_list.size(); 3974 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3975 if (old_method_count == 0) { 3976 virtuals = AllocArtMethodArray(self, new_method_count); 3977 } else { 3978 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3979 } 3980 if (UNLIKELY(virtuals == NULL)) { 3981 CHECK(self->IsExceptionPending()); // OOME. 3982 return false; 3983 } 3984 klass->SetVirtualMethods(virtuals); 3985 3986 StackHandleScope<1> hs(self); 3987 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3988 hs.NewHandle(klass->GetVTableDuringLinking())); 3989 CHECK(vtable.Get() != NULL); 3990 int old_vtable_count = vtable->GetLength(); 3991 int new_vtable_count = old_vtable_count + miranda_list.size(); 3992 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 3993 if (UNLIKELY(vtable.Get() == NULL)) { 3994 CHECK(self->IsExceptionPending()); // OOME. 3995 return false; 3996 } 3997 for (size_t i = 0; i < miranda_list.size(); ++i) { 3998 mirror::ArtMethod* method = miranda_list[i]; 3999 // Leave the declaring class alone as type indices are relative to it 4000 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4001 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4002 klass->SetVirtualMethod(old_method_count + i, method); 4003 vtable->Set<false>(old_vtable_count + i, method); 4004 } 4005 // TODO: do not assign to the vtable field until it is fully constructed. 4006 klass->SetVTable(vtable.Get()); 4007 } 4008 4009 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4010 for (int i = 0; i < vtable->GetLength(); ++i) { 4011 CHECK(vtable->Get(i) != NULL); 4012 } 4013 4014// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4015 4016 return true; 4017} 4018 4019bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4020 CHECK(klass.Get() != NULL); 4021 return LinkFields(klass, false); 4022} 4023 4024bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass) { 4025 CHECK(klass.Get() != NULL); 4026 size_t allocated_class_size = klass->GetClassSize(); 4027 bool success = LinkFields(klass, true); 4028 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 4029 return success; 4030} 4031 4032struct LinkFieldsComparator { 4033 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4034 } 4035 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4036 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4037 NO_THREAD_SAFETY_ANALYSIS { 4038 // First come reference fields, then 64-bit, and finally 32-bit 4039 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4040 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4041 if (type1 != type2) { 4042 bool is_primitive1 = type1 != Primitive::kPrimNot; 4043 bool is_primitive2 = type2 != Primitive::kPrimNot; 4044 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4045 type1 == Primitive::kPrimDouble); 4046 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4047 type2 == Primitive::kPrimDouble); 4048 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4049 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4050 if (order1 != order2) { 4051 return order1 < order2; 4052 } 4053 } 4054 // same basic group? then sort by string. 4055 return strcmp(field1->GetName(), field2->GetName()) < 0; 4056 } 4057}; 4058 4059bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static) { 4060 size_t num_fields = 4061 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4062 4063 mirror::ObjectArray<mirror::ArtField>* fields = 4064 is_static ? klass->GetSFields() : klass->GetIFields(); 4065 4066 // Initialize size and field_offset 4067 size_t size; 4068 MemberOffset field_offset(0); 4069 if (is_static) { 4070 size = klass->GetClassSize(); 4071 field_offset = mirror::Class::FieldsOffset(); 4072 } else { 4073 mirror::Class* super_class = klass->GetSuperClass(); 4074 if (super_class != NULL) { 4075 CHECK(super_class->IsResolved()) 4076 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4077 field_offset = MemberOffset(super_class->GetObjectSize()); 4078 } 4079 size = field_offset.Uint32Value(); 4080 } 4081 4082 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4083 4084 // we want a relatively stable order so that adding new fields 4085 // minimizes disruption of C++ version such as Class and Method. 4086 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4087 for (size_t i = 0; i < num_fields; i++) { 4088 mirror::ArtField* f = fields->Get(i); 4089 CHECK(f != NULL) << PrettyClass(klass.Get()); 4090 grouped_and_sorted_fields.push_back(f); 4091 } 4092 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4093 LinkFieldsComparator()); 4094 4095 // References should be at the front. 4096 size_t current_field = 0; 4097 size_t num_reference_fields = 0; 4098 for (; current_field < num_fields; current_field++) { 4099 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4100 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4101 bool isPrimitive = type != Primitive::kPrimNot; 4102 if (isPrimitive) { 4103 break; // past last reference, move on to the next phase 4104 } 4105 grouped_and_sorted_fields.pop_front(); 4106 num_reference_fields++; 4107 fields->Set<false>(current_field, field); 4108 field->SetOffset(field_offset); 4109 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4110 } 4111 4112 // Now we want to pack all of the double-wide fields together. If 4113 // we're not aligned, though, we want to shuffle one 32-bit field 4114 // into place. If we can't find one, we'll have to pad it. 4115 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4116 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4117 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4118 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4119 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4120 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4121 continue; 4122 } 4123 fields->Set<false>(current_field++, field); 4124 field->SetOffset(field_offset); 4125 // drop the consumed field 4126 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4127 break; 4128 } 4129 // whether we found a 32-bit field for padding or not, we advance 4130 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4131 } 4132 4133 // Alignment is good, shuffle any double-wide fields forward, and 4134 // finish assigning field offsets to all fields. 4135 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 4136 << PrettyClass(klass.Get()); 4137 while (!grouped_and_sorted_fields.empty()) { 4138 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4139 grouped_and_sorted_fields.pop_front(); 4140 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4141 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4142 fields->Set<false>(current_field, field); 4143 field->SetOffset(field_offset); 4144 field_offset = MemberOffset(field_offset.Uint32Value() + 4145 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4146 ? sizeof(uint64_t) 4147 : sizeof(uint32_t))); 4148 current_field++; 4149 } 4150 4151 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4152 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4153 // We know there are no non-reference fields in the Reference classes, and we know 4154 // that 'referent' is alphabetically last, so this is easy... 4155 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4156 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4157 --num_reference_fields; 4158 } 4159 4160 if (kIsDebugBuild) { 4161 // Make sure that all reference fields appear before 4162 // non-reference fields, and all double-wide fields are aligned. 4163 bool seen_non_ref = false; 4164 for (size_t i = 0; i < num_fields; i++) { 4165 mirror::ArtField* field = fields->Get(i); 4166 if (false) { // enable to debug field layout 4167 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4168 << " class=" << PrettyClass(klass.Get()) 4169 << " field=" << PrettyField(field) 4170 << " offset=" 4171 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4172 } 4173 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4174 bool is_primitive = type != Primitive::kPrimNot; 4175 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4176 strcmp("referent", field->GetName()) == 0) { 4177 is_primitive = true; // We lied above, so we have to expect a lie here. 4178 } 4179 if (is_primitive) { 4180 if (!seen_non_ref) { 4181 seen_non_ref = true; 4182 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4183 } 4184 } else { 4185 DCHECK(!seen_non_ref) << PrettyField(field); 4186 } 4187 } 4188 if (!seen_non_ref) { 4189 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4190 } 4191 } 4192 size = field_offset.Uint32Value(); 4193 // Update klass 4194 if (is_static) { 4195 klass->SetNumReferenceStaticFields(num_reference_fields); 4196 klass->SetClassSize(size); 4197 } else { 4198 klass->SetNumReferenceInstanceFields(num_reference_fields); 4199 if (!klass->IsVariableSize()) { 4200 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(); 4201 size_t previous_size = klass->GetObjectSize(); 4202 if (previous_size != 0) { 4203 // Make sure that we didn't originally have an incorrect size. 4204 CHECK_EQ(previous_size, size) << klass->GetDescriptor(); 4205 } 4206 klass->SetObjectSize(size); 4207 } 4208 } 4209 return true; 4210} 4211 4212// Set the bitmap of reference offsets, refOffsets, from the ifields 4213// list. 4214void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4215 uint32_t reference_offsets = 0; 4216 mirror::Class* super_class = klass->GetSuperClass(); 4217 if (super_class != NULL) { 4218 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4219 // If our superclass overflowed, we don't stand a chance. 4220 if (reference_offsets == CLASS_WALK_SUPER) { 4221 klass->SetReferenceInstanceOffsets(reference_offsets); 4222 return; 4223 } 4224 } 4225 CreateReferenceOffsets(klass, false, reference_offsets); 4226} 4227 4228void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4229 CreateReferenceOffsets(klass, true, 0); 4230} 4231 4232void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4233 uint32_t reference_offsets) { 4234 size_t num_reference_fields = 4235 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4236 : klass->NumReferenceInstanceFieldsDuringLinking(); 4237 mirror::ObjectArray<mirror::ArtField>* fields = 4238 is_static ? klass->GetSFields() : klass->GetIFields(); 4239 // All of the fields that contain object references are guaranteed 4240 // to be at the beginning of the fields list. 4241 for (size_t i = 0; i < num_reference_fields; ++i) { 4242 // Note that byte_offset is the offset from the beginning of 4243 // object, not the offset into instance data 4244 mirror::ArtField* field = fields->Get(i); 4245 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4246 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4247 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4248 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4249 CHECK_NE(new_bit, 0U); 4250 reference_offsets |= new_bit; 4251 } else { 4252 reference_offsets = CLASS_WALK_SUPER; 4253 break; 4254 } 4255 } 4256 // Update fields in klass 4257 if (is_static) { 4258 klass->SetReferenceStaticOffsets(reference_offsets); 4259 } else { 4260 klass->SetReferenceInstanceOffsets(reference_offsets); 4261 } 4262} 4263 4264mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4265 Handle<mirror::DexCache> dex_cache) { 4266 DCHECK(dex_cache.Get() != nullptr); 4267 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4268 if (resolved != NULL) { 4269 return resolved; 4270 } 4271 uint32_t utf16_length; 4272 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4273 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4274 dex_cache->SetResolvedString(string_idx, string); 4275 return string; 4276} 4277 4278mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4279 mirror::Class* referrer) { 4280 StackHandleScope<2> hs(Thread::Current()); 4281 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4282 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4283 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4284} 4285 4286mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4287 Handle<mirror::DexCache> dex_cache, 4288 Handle<mirror::ClassLoader> class_loader) { 4289 DCHECK(dex_cache.Get() != NULL); 4290 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4291 if (resolved == NULL) { 4292 Thread* self = Thread::Current(); 4293 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4294 resolved = FindClass(self, descriptor, class_loader); 4295 if (resolved != NULL) { 4296 // TODO: we used to throw here if resolved's class loader was not the 4297 // boot class loader. This was to permit different classes with the 4298 // same name to be loaded simultaneously by different loaders 4299 dex_cache->SetResolvedType(type_idx, resolved); 4300 } else { 4301 CHECK(self->IsExceptionPending()) 4302 << "Expected pending exception for failed resolution of: " << descriptor; 4303 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4304 StackHandleScope<1> hs(self); 4305 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4306 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4307 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4308 self->ClearException(); 4309 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4310 self->GetException(NULL)->SetCause(cause.Get()); 4311 } 4312 } 4313 } 4314 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4315 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4316 return resolved; 4317} 4318 4319mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 4320 Handle<mirror::DexCache> dex_cache, 4321 Handle<mirror::ClassLoader> class_loader, 4322 Handle<mirror::ArtMethod> referrer, 4323 InvokeType type) { 4324 DCHECK(dex_cache.Get() != NULL); 4325 // Check for hit in the dex cache. 4326 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4327 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 4328 return resolved; 4329 } 4330 // Fail, get the declaring class. 4331 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4332 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4333 if (klass == NULL) { 4334 DCHECK(Thread::Current()->IsExceptionPending()); 4335 return NULL; 4336 } 4337 // Scan using method_idx, this saves string compares but will only hit for matching dex 4338 // caches/files. 4339 switch (type) { 4340 case kDirect: // Fall-through. 4341 case kStatic: 4342 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 4343 break; 4344 case kInterface: 4345 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 4346 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4347 break; 4348 case kSuper: // Fall-through. 4349 case kVirtual: 4350 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 4351 break; 4352 default: 4353 LOG(FATAL) << "Unreachable - invocation type: " << type; 4354 } 4355 if (resolved == NULL) { 4356 // Search by name, which works across dex files. 4357 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4358 const Signature signature = dex_file.GetMethodSignature(method_id); 4359 switch (type) { 4360 case kDirect: // Fall-through. 4361 case kStatic: 4362 resolved = klass->FindDirectMethod(name, signature); 4363 break; 4364 case kInterface: 4365 resolved = klass->FindInterfaceMethod(name, signature); 4366 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4367 break; 4368 case kSuper: // Fall-through. 4369 case kVirtual: 4370 resolved = klass->FindVirtualMethod(name, signature); 4371 break; 4372 } 4373 } 4374 if (resolved != NULL) { 4375 // We found a method, check for incompatible class changes. 4376 if (resolved->CheckIncompatibleClassChange(type)) { 4377 resolved = NULL; 4378 } 4379 } 4380 if (resolved != NULL) { 4381 // Be a good citizen and update the dex cache to speed subsequent calls. 4382 dex_cache->SetResolvedMethod(method_idx, resolved); 4383 return resolved; 4384 } else { 4385 // We failed to find the method which means either an access error, an incompatible class 4386 // change, or no such method. First try to find the method among direct and virtual methods. 4387 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4388 const Signature signature = dex_file.GetMethodSignature(method_id); 4389 switch (type) { 4390 case kDirect: 4391 case kStatic: 4392 resolved = klass->FindVirtualMethod(name, signature); 4393 break; 4394 case kInterface: 4395 case kVirtual: 4396 case kSuper: 4397 resolved = klass->FindDirectMethod(name, signature); 4398 break; 4399 } 4400 4401 // If we found something, check that it can be accessed by the referrer. 4402 if (resolved != NULL && referrer.Get() != NULL) { 4403 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4404 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4405 if (!referring_class->CanAccess(methods_class)) { 4406 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4407 resolved, type); 4408 return NULL; 4409 } else if (!referring_class->CanAccessMember(methods_class, 4410 resolved->GetAccessFlags())) { 4411 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4412 return NULL; 4413 } 4414 } 4415 4416 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4417 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4418 switch (type) { 4419 case kDirect: 4420 case kStatic: 4421 if (resolved != NULL) { 4422 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4423 } else { 4424 resolved = klass->FindInterfaceMethod(name, signature); 4425 if (resolved != NULL) { 4426 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4427 } else { 4428 ThrowNoSuchMethodError(type, klass, name, signature); 4429 } 4430 } 4431 break; 4432 case kInterface: 4433 if (resolved != NULL) { 4434 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4435 } else { 4436 resolved = klass->FindVirtualMethod(name, signature); 4437 if (resolved != NULL) { 4438 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4439 } else { 4440 ThrowNoSuchMethodError(type, klass, name, signature); 4441 } 4442 } 4443 break; 4444 case kSuper: 4445 ThrowNoSuchMethodError(type, klass, name, signature); 4446 break; 4447 case kVirtual: 4448 if (resolved != NULL) { 4449 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4450 } else { 4451 resolved = klass->FindInterfaceMethod(name, signature); 4452 if (resolved != NULL) { 4453 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4454 } else { 4455 ThrowNoSuchMethodError(type, klass, name, signature); 4456 } 4457 } 4458 break; 4459 } 4460 DCHECK(Thread::Current()->IsExceptionPending()); 4461 return NULL; 4462 } 4463} 4464 4465mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4466 Handle<mirror::DexCache> dex_cache, 4467 Handle<mirror::ClassLoader> class_loader, 4468 bool is_static) { 4469 DCHECK(dex_cache.Get() != nullptr); 4470 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4471 if (resolved != NULL) { 4472 return resolved; 4473 } 4474 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4475 Thread* const self = Thread::Current(); 4476 StackHandleScope<1> hs(self); 4477 Handle<mirror::Class> klass( 4478 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4479 if (klass.Get() == NULL) { 4480 DCHECK(Thread::Current()->IsExceptionPending()); 4481 return NULL; 4482 } 4483 4484 if (is_static) { 4485 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 4486 } else { 4487 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 4488 } 4489 4490 if (resolved == NULL) { 4491 const char* name = dex_file.GetFieldName(field_id); 4492 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4493 if (is_static) { 4494 resolved = mirror::Class::FindStaticField(self, klass, name, type); 4495 } else { 4496 resolved = klass->FindInstanceField(name, type); 4497 } 4498 if (resolved == NULL) { 4499 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 4500 return NULL; 4501 } 4502 } 4503 dex_cache->SetResolvedField(field_idx, resolved); 4504 return resolved; 4505} 4506 4507mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4508 uint32_t field_idx, 4509 Handle<mirror::DexCache> dex_cache, 4510 Handle<mirror::ClassLoader> class_loader) { 4511 DCHECK(dex_cache.Get() != nullptr); 4512 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4513 if (resolved != NULL) { 4514 return resolved; 4515 } 4516 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4517 Thread* self = Thread::Current(); 4518 StackHandleScope<1> hs(self); 4519 Handle<mirror::Class> klass( 4520 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4521 if (klass.Get() == NULL) { 4522 DCHECK(Thread::Current()->IsExceptionPending()); 4523 return NULL; 4524 } 4525 4526 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4527 StringPiece type(dex_file.StringDataByIdx( 4528 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4529 resolved = mirror::Class::FindField(self, klass, name, type); 4530 if (resolved != NULL) { 4531 dex_cache->SetResolvedField(field_idx, resolved); 4532 } else { 4533 ThrowNoSuchFieldError("", klass.Get(), type, name); 4534 } 4535 return resolved; 4536} 4537 4538const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4539 uint32_t* length) { 4540 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4541 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4542 const DexFile& dex_file = *dex_cache->GetDexFile(); 4543 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4544 return dex_file.GetMethodShorty(method_id, length); 4545} 4546 4547void ClassLinker::DumpAllClasses(int flags) { 4548 if (dex_cache_image_class_lookup_required_) { 4549 MoveImageClassesToClassTable(); 4550 } 4551 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4552 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4553 std::vector<mirror::Class*> all_classes; 4554 { 4555 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4556 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 4557 mirror::Class** root = &it.second; 4558 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 4559 all_classes.push_back(klass); 4560 } 4561 } 4562 4563 for (size_t i = 0; i < all_classes.size(); ++i) { 4564 all_classes[i]->DumpClass(std::cerr, flags); 4565 } 4566} 4567 4568void ClassLinker::DumpForSigQuit(std::ostream& os) { 4569 if (dex_cache_image_class_lookup_required_) { 4570 MoveImageClassesToClassTable(); 4571 } 4572 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4573 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4574} 4575 4576size_t ClassLinker::NumLoadedClasses() { 4577 if (dex_cache_image_class_lookup_required_) { 4578 MoveImageClassesToClassTable(); 4579 } 4580 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4581 return class_table_.size(); 4582} 4583 4584pid_t ClassLinker::GetClassesLockOwner() { 4585 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4586} 4587 4588pid_t ClassLinker::GetDexLockOwner() { 4589 return dex_lock_.GetExclusiveOwnerTid(); 4590} 4591 4592void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4593 DCHECK(!init_done_); 4594 4595 DCHECK(klass != NULL); 4596 DCHECK(klass->GetClassLoader() == NULL); 4597 4598 mirror::ObjectArray<mirror::Class>* class_roots = 4599 ReadBarrier::BarrierForRoot<mirror::ObjectArray<mirror::Class>, kWithReadBarrier>( 4600 &class_roots_); 4601 DCHECK(class_roots != NULL); 4602 DCHECK(class_roots->Get(class_root) == NULL); 4603 class_roots->Set<false>(class_root, klass); 4604} 4605 4606} // namespace art 4607