class_linker.cc revision c87d27b25994da8670d82a8f7bad6327b693bfff
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("-Xms64m"); 585 argv.push_back("--runtime-arg"); 586 argv.push_back("-Xmx64m"); 587 argv.push_back("--runtime-arg"); 588 argv.push_back("-classpath"); 589 argv.push_back("--runtime-arg"); 590 argv.push_back(Runtime::Current()->GetClassPathString()); 591 592 Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&argv); 593 594 if (!Runtime::Current()->IsVerificationEnabled()) { 595 argv.push_back("--compiler-filter=verify-none"); 596 } 597 598 if (!kIsTargetBuild) { 599 argv.push_back("--host"); 600 } 601 602 argv.push_back(boot_image_option); 603 argv.push_back(dex_file_option); 604 argv.push_back(oat_fd_option); 605 argv.push_back(oat_location_option); 606 const std::vector<std::string>& compiler_options = Runtime::Current()->GetCompilerOptions(); 607 for (size_t i = 0; i < compiler_options.size(); ++i) { 608 argv.push_back(compiler_options[i].c_str()); 609 } 610 611 return Exec(argv, error_msg); 612} 613 614const OatFile* ClassLinker::RegisterOatFile(const OatFile* oat_file) { 615 WriterMutexLock mu(Thread::Current(), dex_lock_); 616 if (kIsDebugBuild) { 617 for (size_t i = 0; i < oat_files_.size(); ++i) { 618 CHECK_NE(oat_file, oat_files_[i]) << oat_file->GetLocation(); 619 } 620 } 621 VLOG(class_linker) << "Registering " << oat_file->GetLocation(); 622 oat_files_.push_back(oat_file); 623 return oat_file; 624} 625 626OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) { 627 VLOG(startup) << "ClassLinker::GetImageOatFile entering"; 628 OatFile* oat_file = space->ReleaseOatFile(); 629 CHECK_EQ(RegisterOatFile(oat_file), oat_file); 630 VLOG(startup) << "ClassLinker::GetImageOatFile exiting"; 631 return *oat_file; 632} 633 634const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) { 635 const char* dex_location = dex_file.GetLocation().c_str(); 636 uint32_t dex_location_checksum = dex_file.GetLocationChecksum(); 637 return FindOpenedOatFile(nullptr, dex_location, &dex_location_checksum); 638} 639 640const OatFile* ClassLinker::FindOpenedOatFile(const char* oat_location, const char* dex_location, 641 const uint32_t* const dex_location_checksum) { 642 ReaderMutexLock mu(Thread::Current(), dex_lock_); 643 for (size_t i = 0; i < oat_files_.size(); i++) { 644 const OatFile* oat_file = oat_files_[i]; 645 DCHECK(oat_file != NULL); 646 647 if (oat_location != nullptr) { 648 if (oat_file->GetLocation() != oat_location) { 649 continue; 650 } 651 } 652 653 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 654 dex_location_checksum, 655 false); 656 if (oat_dex_file != NULL) { 657 return oat_file; 658 } 659 } 660 return NULL; 661} 662 663static std::string GetMultiDexClassesDexName(size_t number, const char* dex_location) { 664 if (number == 0) { 665 return dex_location; 666 } else { 667 return StringPrintf("%s" kMultiDexSeparatorString "classes%zu.dex", dex_location, number + 1); 668 } 669} 670 671static bool LoadMultiDexFilesFromOatFile(const OatFile* oat_file, const char* dex_location, 672 bool generated, 673 std::vector<std::string>* error_msgs, 674 std::vector<const DexFile*>* dex_files) { 675 if (oat_file == nullptr) { 676 return false; 677 } 678 679 size_t old_size = dex_files->size(); // To rollback on error. 680 681 bool success = true; 682 for (size_t i = 0; success; ++i) { 683 std::string next_name_str = GetMultiDexClassesDexName(i, dex_location); 684 const char* next_name = next_name_str.c_str(); 685 686 uint32_t dex_location_checksum; 687 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 688 std::string error_msg; 689 if (!DexFile::GetChecksum(next_name, dex_location_checksum_pointer, &error_msg)) { 690 DCHECK_EQ(false, i == 0 && generated); 691 dex_location_checksum_pointer = nullptr; 692 } 693 694 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(next_name, nullptr, false); 695 696 if (oat_dex_file == nullptr) { 697 if (i == 0 && generated) { 698 std::string error_msg; 699 error_msg = StringPrintf("\nFailed to find dex file '%s' (checksum 0x%x) in generated out " 700 " file'%s'", dex_location, dex_location_checksum, 701 oat_file->GetLocation().c_str()); 702 error_msgs->push_back(error_msg); 703 } 704 break; // Not found, done. 705 } 706 707 // Checksum test. Test must succeed when generated. 708 success = !generated; 709 if (dex_location_checksum_pointer != nullptr) { 710 success = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 711 } 712 713 if (success) { 714 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 715 if (dex_file == nullptr) { 716 success = false; 717 error_msgs->push_back(error_msg); 718 } else { 719 dex_files->push_back(dex_file); 720 } 721 } 722 723 // When we generated the file, we expect success, or something is terribly wrong. 724 CHECK_EQ(false, generated && !success) 725 << "dex_location=" << next_name << " oat_location=" << oat_file->GetLocation().c_str() 726 << std::hex << " dex_location_checksum=" << dex_location_checksum 727 << " OatDexFile::GetLocationChecksum()=" << oat_dex_file->GetDexFileLocationChecksum(); 728 } 729 730 if (dex_files->size() == old_size) { 731 success = false; // We did not even find classes.dex 732 } 733 734 if (success) { 735 return true; 736 } else { 737 // Free all the dex files we have loaded. 738 auto it = dex_files->begin() + old_size; 739 auto it_end = dex_files->end(); 740 for (; it != it_end; it++) { 741 delete *it; 742 } 743 dex_files->erase(dex_files->begin() + old_size, it_end); 744 745 return false; 746 } 747} 748 749// Multidex files make it possible that some, but not all, dex files can be broken/outdated. This 750// complicates the loading process, as we should not use an iterative loading process, because that 751// would register the oat file and dex files that come before the broken one. Instead, check all 752// multidex ahead of time. 753bool ClassLinker::OpenDexFilesFromOat(const char* dex_location, const char* oat_location, 754 std::vector<std::string>* error_msgs, 755 std::vector<const DexFile*>* dex_files) { 756 // 1) Check whether we have an open oat file. 757 // This requires a dex checksum, use the "primary" one. 758 uint32_t dex_location_checksum; 759 uint32_t* dex_location_checksum_pointer = &dex_location_checksum; 760 bool have_checksum = true; 761 std::string checksum_error_msg; 762 if (!DexFile::GetChecksum(dex_location, dex_location_checksum_pointer, &checksum_error_msg)) { 763 dex_location_checksum_pointer = nullptr; 764 have_checksum = false; 765 } 766 767 bool needs_registering = false; 768 769 std::unique_ptr<const OatFile> open_oat_file(FindOpenedOatFile(oat_location, dex_location, 770 dex_location_checksum_pointer)); 771 772 // 2) If we do not have an open one, maybe there's one on disk already. 773 774 // In case the oat file is not open, we play a locking game here so 775 // that if two different processes race to load and register or generate 776 // (or worse, one tries to open a partial generated file) we will be okay. 777 // This is actually common with apps that use DexClassLoader to work 778 // around the dex method reference limit and that have a background 779 // service running in a separate process. 780 ScopedFlock scoped_flock; 781 782 if (open_oat_file.get() == nullptr) { 783 if (oat_location != nullptr) { 784 // Can only do this if we have a checksum, else error. 785 if (!have_checksum) { 786 error_msgs->push_back(checksum_error_msg); 787 return false; 788 } 789 790 std::string error_msg; 791 792 // We are loading or creating one in the future. Time to set up the file lock. 793 if (!scoped_flock.Init(oat_location, &error_msg)) { 794 error_msgs->push_back(error_msg); 795 return false; 796 } 797 798 open_oat_file.reset(FindOatFileInOatLocationForDexFile(dex_location, dex_location_checksum, 799 oat_location, &error_msg)); 800 801 if (open_oat_file.get() == nullptr) { 802 std::string compound_msg = StringPrintf("Failed to find dex file '%s' in oat location '%s': %s", 803 dex_location, oat_location, error_msg.c_str()); 804 VLOG(class_linker) << compound_msg; 805 error_msgs->push_back(compound_msg); 806 } 807 } else { 808 // TODO: What to lock here? 809 open_oat_file.reset(FindOatFileContainingDexFileFromDexLocation(dex_location, 810 dex_location_checksum_pointer, 811 kRuntimeISA, error_msgs)); 812 } 813 needs_registering = true; 814 } 815 816 // 3) If we have an oat file, check all contained multidex files for our dex_location. 817 // Note: LoadMultiDexFilesFromOatFile will check for nullptr in the first argument. 818 bool success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, false, error_msgs, 819 dex_files); 820 if (success) { 821 const OatFile* oat_file = open_oat_file.release(); // Avoid deleting it. 822 if (needs_registering) { 823 // We opened the oat file, so we must register it. 824 RegisterOatFile(oat_file); 825 } 826 return true; 827 } else { 828 if (needs_registering) { 829 // We opened it, delete it. 830 open_oat_file.reset(); 831 } else { 832 open_oat_file.release(); // Do not delete open oat files. 833 } 834 } 835 836 // 4) If it's not the case (either no oat file or mismatches), regenerate and load. 837 838 // Need a checksum, fail else. 839 if (!have_checksum) { 840 error_msgs->push_back(checksum_error_msg); 841 return false; 842 } 843 844 // Look in cache location if no oat_location is given. 845 std::string cache_location; 846 if (oat_location == nullptr) { 847 // Use the dalvik cache. 848 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 849 cache_location = GetDalvikCacheFilenameOrDie(dex_location, dalvik_cache.c_str()); 850 oat_location = cache_location.c_str(); 851 } 852 853 // Definitely need to lock now. 854 if (!scoped_flock.HasFile()) { 855 std::string error_msg; 856 if (!scoped_flock.Init(oat_location, &error_msg)) { 857 error_msgs->push_back(error_msg); 858 return false; 859 } 860 } 861 862 // Create the oat file. 863 open_oat_file.reset(CreateOatFileForDexLocation(dex_location, scoped_flock.GetFile()->Fd(), 864 oat_location, error_msgs)); 865 866 // Failed, bail. 867 if (open_oat_file.get() == nullptr) { 868 return false; 869 } 870 871 // Try to load again, but stronger checks. 872 success = LoadMultiDexFilesFromOatFile(open_oat_file.get(), dex_location, true, error_msgs, 873 dex_files); 874 if (success) { 875 RegisterOatFile(open_oat_file.release()); 876 return true; 877 } else { 878 return false; 879 } 880} 881 882const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_location, 883 uint32_t dex_location_checksum, 884 const char* oat_location, 885 std::string* error_msg) { 886 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 887 !Runtime::Current()->IsCompiler(), 888 error_msg)); 889 if (oat_file.get() == nullptr) { 890 *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location, 891 error_msg->c_str()); 892 return nullptr; 893 } 894 Runtime* runtime = Runtime::Current(); 895 const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader(); 896 uint32_t expected_image_oat_checksum = image_header.GetOatChecksum(); 897 uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum(); 898 if (expected_image_oat_checksum != actual_image_oat_checksum) { 899 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat checksum of " 900 "0x%x, found 0x%x", oat_location, expected_image_oat_checksum, 901 actual_image_oat_checksum); 902 return nullptr; 903 } 904 905 uintptr_t expected_image_oat_offset = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 906 uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(); 907 if (expected_image_oat_offset != actual_image_oat_offset) { 908 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected image oat offset %" 909 PRIuPTR ", found %ud", oat_location, expected_image_oat_offset, 910 actual_image_oat_offset); 911 return nullptr; 912 } 913 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 914 &dex_location_checksum); 915 if (oat_dex_file == nullptr) { 916 *error_msg = StringPrintf("Failed to find oat file at '%s' containing '%s'", oat_location, 917 dex_location); 918 return nullptr; 919 } 920 uint32_t expected_dex_checksum = dex_location_checksum; 921 uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum(); 922 if (expected_dex_checksum != actual_dex_checksum) { 923 *error_msg = StringPrintf("Failed to find oat file at '%s' with expected dex checksum of 0x%x, " 924 "found 0x%x", oat_location, expected_dex_checksum, 925 actual_dex_checksum); 926 return nullptr; 927 } 928 std::unique_ptr<const DexFile> dex_file(oat_dex_file->OpenDexFile(error_msg)); 929 if (dex_file.get() != nullptr) { 930 return oat_file.release(); 931 } else { 932 return nullptr; 933 } 934} 935 936const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location, 937 int fd, const char* oat_location, 938 std::vector<std::string>* error_msgs) { 939 // Generate the output oat file for the dex file 940 VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location; 941 std::string error_msg; 942 if (!GenerateOatFile(dex_location, fd, oat_location, &error_msg)) { 943 CHECK(!error_msg.empty()); 944 error_msgs->push_back(error_msg); 945 return nullptr; 946 } 947 std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL, 948 !Runtime::Current()->IsCompiler(), 949 &error_msg)); 950 if (oat_file.get() == nullptr) { 951 std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s", 952 oat_location, error_msg.c_str()); 953 error_msgs->push_back(compound_msg); 954 return nullptr; 955 } 956 957 return oat_file.release(); 958} 959 960bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file, 961 const char* dex_location, 962 uint32_t dex_location_checksum, 963 const InstructionSet instruction_set, 964 std::string* error_msg) { 965 Runtime* runtime = Runtime::Current(); 966 const gc::space::ImageSpace* image_space = runtime->GetHeap()->GetImageSpace(); 967 968 // If the requested instruction set is the same as the current runtime, 969 // we can use the checksums directly. If it isn't, we'll have to read the 970 // image header from the image for the right instruction set. 971 uint32_t image_oat_checksum = 0; 972 uintptr_t image_oat_data_begin = 0; 973 if (instruction_set == kRuntimeISA) { 974 const ImageHeader& image_header = image_space->GetImageHeader(); 975 image_oat_checksum = image_header.GetOatChecksum(); 976 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()); 977 } else { 978 std::unique_ptr<ImageHeader> image_header(gc::space::ImageSpace::ReadImageHeaderOrDie( 979 image_space->GetImageLocation().c_str(), instruction_set)); 980 image_oat_checksum = image_header->GetOatChecksum(); 981 image_oat_data_begin = reinterpret_cast<uintptr_t>(image_header->GetOatDataBegin()); 982 } 983 const OatHeader& oat_header = oat_file->GetOatHeader(); 984 bool image_check = ((oat_header.GetImageFileLocationOatChecksum() == image_oat_checksum) 985 && (oat_header.GetImageFileLocationOatDataBegin() == image_oat_data_begin)); 986 987 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, 988 &dex_location_checksum); 989 if (oat_dex_file == NULL) { 990 *error_msg = StringPrintf("oat file '%s' does not contain contents for '%s' with checksum 0x%x", 991 oat_file->GetLocation().c_str(), dex_location, dex_location_checksum); 992 std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles(); 993 for (size_t i = 0; i < oat_dex_files.size(); i++) { 994 const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i]; 995 *error_msg += StringPrintf("\noat file '%s' contains contents for '%s'", 996 oat_file->GetLocation().c_str(), 997 oat_dex_file->GetDexFileLocation().c_str()); 998 } 999 return false; 1000 } 1001 bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum(); 1002 1003 if (image_check && dex_check) { 1004 return true; 1005 } 1006 1007 if (!image_check) { 1008 ScopedObjectAccess soa(Thread::Current()); 1009 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x, %d) with (0x%x, %" PRIdPTR ")", 1010 oat_file->GetLocation().c_str(), 1011 oat_file->GetOatHeader().GetImageFileLocationOatChecksum(), 1012 oat_file->GetOatHeader().GetImageFileLocationOatDataBegin(), 1013 image_oat_checksum, image_oat_data_begin); 1014 } 1015 if (!dex_check) { 1016 *error_msg = StringPrintf("oat file '%s' mismatch (0x%x) with '%s' (0x%x)", 1017 oat_file->GetLocation().c_str(), 1018 oat_dex_file->GetDexFileLocationChecksum(), 1019 dex_location, dex_location_checksum); 1020 } 1021 return false; 1022} 1023 1024const OatFile* ClassLinker::LoadOatFileAndVerifyDexFile(const std::string& oat_file_location, 1025 const char* dex_location, 1026 std::string* error_msg, 1027 bool* open_failed) { 1028 std::unique_ptr<const OatFile> oat_file(FindOatFileFromOatLocation(oat_file_location, error_msg)); 1029 if (oat_file.get() == nullptr) { 1030 *open_failed = true; 1031 return nullptr; 1032 } 1033 *open_failed = false; 1034 std::unique_ptr<const DexFile> dex_file; 1035 uint32_t dex_location_checksum; 1036 if (!DexFile::GetChecksum(dex_location, &dex_location_checksum, error_msg)) { 1037 // If no classes.dex found in dex_location, it has been stripped or is corrupt, assume oat is 1038 // up-to-date. This is the common case in user builds for jar's and apk's in the /system 1039 // directory. 1040 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL); 1041 if (oat_dex_file == nullptr) { 1042 *error_msg = StringPrintf("Dex checksum mismatch for location '%s' and failed to find oat " 1043 "dex file '%s': %s", oat_file_location.c_str(), dex_location, 1044 error_msg->c_str()); 1045 return nullptr; 1046 } 1047 dex_file.reset(oat_dex_file->OpenDexFile(error_msg)); 1048 } else { 1049 bool verified = VerifyOatFileChecksums(oat_file.get(), dex_location, dex_location_checksum, 1050 kRuntimeISA, error_msg); 1051 if (!verified) { 1052 return nullptr; 1053 } 1054 dex_file.reset(oat_file->GetOatDexFile(dex_location, 1055 &dex_location_checksum)->OpenDexFile(error_msg)); 1056 } 1057 1058 if (dex_file.get() != nullptr) { 1059 return oat_file.release(); 1060 } else { 1061 return nullptr; 1062 } 1063} 1064 1065const OatFile* ClassLinker::FindOatFileContainingDexFileFromDexLocation( 1066 const char* dex_location, 1067 const uint32_t* const dex_location_checksum, 1068 InstructionSet isa, 1069 std::vector<std::string>* error_msgs) { 1070 // Look for an existing file next to dex. for example, for 1071 // /foo/bar/baz.jar, look for /foo/bar/<isa>/baz.odex. 1072 std::string odex_filename(DexFilenameToOdexFilename(dex_location, isa)); 1073 bool open_failed; 1074 std::string error_msg; 1075 const OatFile* oat_file = LoadOatFileAndVerifyDexFile(odex_filename, dex_location, &error_msg, 1076 &open_failed); 1077 if (oat_file != nullptr) { 1078 return oat_file; 1079 } 1080 if (dex_location_checksum == nullptr) { 1081 error_msgs->push_back(StringPrintf("Failed to open oat file from %s and no classes.dex found in" 1082 "%s: %s", odex_filename.c_str(), dex_location, 1083 error_msg.c_str())); 1084 return nullptr; 1085 } 1086 1087 std::string cache_error_msg; 1088 const std::string dalvik_cache(GetDalvikCacheOrDie(GetInstructionSetString(kRuntimeISA))); 1089 std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location, 1090 dalvik_cache.c_str())); 1091 oat_file = LoadOatFileAndVerifyDexFile(cache_location, dex_location, &cache_error_msg, 1092 &open_failed); 1093 if (oat_file != nullptr) { 1094 return oat_file; 1095 } 1096 if (!open_failed && TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) { 1097 PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location; 1098 } 1099 std::string compound_msg = StringPrintf("Failed to open oat file from %s (error '%s') or %s " 1100 "(error '%s').", odex_filename.c_str(), error_msg.c_str(), 1101 cache_location.c_str(), cache_error_msg.c_str()); 1102 VLOG(class_linker) << compound_msg; 1103 error_msgs->push_back(compound_msg); 1104 1105 return nullptr; 1106} 1107 1108const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) { 1109 ReaderMutexLock mu(Thread::Current(), dex_lock_); 1110 for (size_t i = 0; i < oat_files_.size(); i++) { 1111 const OatFile* oat_file = oat_files_[i]; 1112 DCHECK(oat_file != nullptr); 1113 if (oat_file->GetLocation() == oat_location) { 1114 return oat_file; 1115 } 1116 } 1117 return nullptr; 1118} 1119 1120const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location, 1121 std::string* error_msg) { 1122 const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location); 1123 if (oat_file != nullptr) { 1124 return oat_file; 1125 } 1126 1127 oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler(), 1128 error_msg); 1129 if (oat_file == NULL) { 1130 return NULL; 1131 } 1132 return oat_file; 1133} 1134 1135static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) 1136 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1137 ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg); 1138 1139 DCHECK(obj != NULL); 1140 DCHECK(class_linker != NULL); 1141 1142 if (obj->IsArtMethod()) { 1143 mirror::ArtMethod* method = obj->AsArtMethod(); 1144 if (!method->IsNative()) { 1145 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1146 if (method != Runtime::Current()->GetResolutionMethod()) { 1147 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1148 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1149 } 1150 } 1151 } 1152} 1153 1154void ClassLinker::InitFromImage() { 1155 VLOG(startup) << "ClassLinker::InitFromImage entering"; 1156 CHECK(!init_done_); 1157 1158 Thread* self = Thread::Current(); 1159 gc::Heap* heap = Runtime::Current()->GetHeap(); 1160 gc::space::ImageSpace* space = heap->GetImageSpace(); 1161 dex_cache_image_class_lookup_required_ = true; 1162 CHECK(space != NULL); 1163 OatFile& oat_file = GetImageOatFile(space); 1164 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U); 1165 CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U); 1166 const char* image_file_location = oat_file.GetOatHeader(). 1167 GetStoreValueByKey(OatHeader::kImageLocationKey); 1168 CHECK(image_file_location == nullptr || *image_file_location == 0); 1169 portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline(); 1170 quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline(); 1171 portable_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetPortableImtConflictTrampoline(); 1172 quick_imt_conflict_trampoline_ = oat_file.GetOatHeader().GetQuickImtConflictTrampoline(); 1173 quick_generic_jni_trampoline_ = oat_file.GetOatHeader().GetQuickGenericJniTrampoline(); 1174 quick_to_interpreter_bridge_trampoline_ = oat_file.GetOatHeader().GetQuickToInterpreterBridge(); 1175 mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 1176 mirror::ObjectArray<mirror::DexCache>* dex_caches = 1177 dex_caches_object->AsObjectArray<mirror::DexCache>(); 1178 1179 StackHandleScope<1> hs(self); 1180 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle( 1181 space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)-> 1182 AsObjectArray<mirror::Class>())); 1183 class_roots_ = class_roots.Get(); 1184 1185 // Special case of setting up the String class early so that we can test arbitrary objects 1186 // as being Strings or not 1187 mirror::String::SetClass(GetClassRoot(kJavaLangString)); 1188 1189 CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(), 1190 static_cast<uint32_t>(dex_caches->GetLength())); 1191 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 1192 StackHandleScope<1> hs(self); 1193 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_caches->Get(i))); 1194 const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8()); 1195 const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location.c_str(), 1196 nullptr); 1197 CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location; 1198 std::string error_msg; 1199 const DexFile* dex_file = oat_dex_file->OpenDexFile(&error_msg); 1200 if (dex_file == NULL) { 1201 LOG(FATAL) << "Failed to open dex file " << dex_file_location 1202 << " from within oat file " << oat_file.GetLocation() 1203 << " error '" << error_msg << "'"; 1204 } 1205 1206 CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum()); 1207 1208 AppendToBootClassPath(*dex_file, dex_cache); 1209 } 1210 1211 // Set classes on AbstractMethod early so that IsMethod tests can be performed during the live 1212 // bitmap walk. 1213 mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod)); 1214 1215 // Set entry point to interpreter if in InterpretOnly mode. 1216 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 1217 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 1218 heap->VisitObjects(InitFromImageInterpretOnlyCallback, this); 1219 } 1220 1221 // reinit class_roots_ 1222 mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass)); 1223 class_roots_ = class_roots.Get(); 1224 1225 // reinit array_iftable_ from any array class instance, they should be == 1226 array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable(); 1227 DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable()); 1228 // String class root was set above 1229 mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField)); 1230 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass)); 1231 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass)); 1232 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass)); 1233 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass)); 1234 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass)); 1235 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass)); 1236 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass)); 1237 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass)); 1238 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable)); 1239 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement)); 1240 1241 FinishInit(self); 1242 1243 VLOG(startup) << "ClassLinker::InitFromImage exiting"; 1244} 1245 1246void ClassLinker::VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1247 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1248 if ((flags & kVisitRootFlagAllRoots) != 0) { 1249 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1250 callback(reinterpret_cast<mirror::Object**>(&it.second), arg, 0, kRootStickyClass); 1251 } 1252 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1253 for (auto& pair : new_class_roots_) { 1254 mirror::Object* old_ref = pair.second; 1255 callback(reinterpret_cast<mirror::Object**>(&pair.second), arg, 0, kRootStickyClass); 1256 if (UNLIKELY(pair.second != old_ref)) { 1257 // Uh ohes, GC moved a root in the log. Need to search the class_table and update the 1258 // corresponding object. This is slow, but luckily for us, this may only happen with a 1259 // concurrent moving GC. 1260 for (auto it = class_table_.lower_bound(pair.first), end = class_table_.end(); 1261 it != end && it->first == pair.first; ++it) { 1262 // If the class stored matches the old class, update it to the new value. 1263 if (old_ref == it->second) { 1264 it->second = pair.second; 1265 } 1266 } 1267 } 1268 } 1269 } 1270 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1271 new_class_roots_.clear(); 1272 } 1273 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1274 log_new_class_table_roots_ = true; 1275 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1276 log_new_class_table_roots_ = false; 1277 } 1278 // We deliberately ignore the class roots in the image since we 1279 // handle image roots by using the MS/CMS rescanning of dirty cards. 1280} 1281 1282// Keep in sync with InitCallback. Anything we visit, we need to 1283// reinit references to when reinitializing a ClassLinker from a 1284// mapped image. 1285void ClassLinker::VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags) { 1286 callback(reinterpret_cast<mirror::Object**>(&class_roots_), arg, 0, kRootVMInternal); 1287 Thread* self = Thread::Current(); 1288 { 1289 ReaderMutexLock mu(self, dex_lock_); 1290 if ((flags & kVisitRootFlagAllRoots) != 0) { 1291 for (mirror::DexCache*& dex_cache : dex_caches_) { 1292 callback(reinterpret_cast<mirror::Object**>(&dex_cache), arg, 0, kRootVMInternal); 1293 } 1294 } else if ((flags & kVisitRootFlagNewRoots) != 0) { 1295 for (size_t index : new_dex_cache_roots_) { 1296 callback(reinterpret_cast<mirror::Object**>(&dex_caches_[index]), arg, 0, kRootVMInternal); 1297 } 1298 } 1299 if ((flags & kVisitRootFlagClearRootLog) != 0) { 1300 new_dex_cache_roots_.clear(); 1301 } 1302 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) { 1303 log_new_dex_caches_roots_ = true; 1304 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) { 1305 log_new_dex_caches_roots_ = false; 1306 } 1307 } 1308 VisitClassRoots(callback, arg, flags); 1309 callback(reinterpret_cast<mirror::Object**>(&array_iftable_), arg, 0, kRootVMInternal); 1310 DCHECK(array_iftable_ != nullptr); 1311 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 1312 if (find_array_class_cache_[i] != nullptr) { 1313 callback(reinterpret_cast<mirror::Object**>(&find_array_class_cache_[i]), arg, 0, 1314 kRootVMInternal); 1315 } 1316 } 1317} 1318 1319void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) { 1320 if (dex_cache_image_class_lookup_required_) { 1321 MoveImageClassesToClassTable(); 1322 } 1323 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 1324 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 1325 mirror::Class** root = &it.second; 1326 mirror::Class* c = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 1327 if (!visitor(c, arg)) { 1328 return; 1329 } 1330 } 1331} 1332 1333static bool GetClassesVisitor(mirror::Class* c, void* arg) { 1334 std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg); 1335 classes->insert(c); 1336 return true; 1337} 1338 1339void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) { 1340 std::set<mirror::Class*> classes; 1341 VisitClasses(GetClassesVisitor, &classes); 1342 for (mirror::Class* klass : classes) { 1343 if (!visitor(klass, arg)) { 1344 return; 1345 } 1346 } 1347} 1348 1349ClassLinker::~ClassLinker() { 1350 mirror::Class::ResetClass(); 1351 mirror::String::ResetClass(); 1352 mirror::ArtField::ResetClass(); 1353 mirror::ArtMethod::ResetClass(); 1354 mirror::BooleanArray::ResetArrayClass(); 1355 mirror::ByteArray::ResetArrayClass(); 1356 mirror::CharArray::ResetArrayClass(); 1357 mirror::DoubleArray::ResetArrayClass(); 1358 mirror::FloatArray::ResetArrayClass(); 1359 mirror::IntArray::ResetArrayClass(); 1360 mirror::LongArray::ResetArrayClass(); 1361 mirror::ShortArray::ResetArrayClass(); 1362 mirror::Throwable::ResetClass(); 1363 mirror::StackTraceElement::ResetClass(); 1364 STLDeleteElements(&boot_class_path_); 1365 STLDeleteElements(&oat_files_); 1366} 1367 1368mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) { 1369 gc::Heap* heap = Runtime::Current()->GetHeap(); 1370 StackHandleScope<16> hs(self); 1371 Handle<mirror::Class> dex_cache_class(hs.NewHandle(GetClassRoot(kJavaLangDexCache))); 1372 Handle<mirror::DexCache> dex_cache( 1373 hs.NewHandle(down_cast<mirror::DexCache*>( 1374 heap->AllocObject<true>(self, dex_cache_class.Get(), dex_cache_class->GetObjectSize(), 1375 VoidFunctor())))); 1376 if (dex_cache.Get() == NULL) { 1377 return NULL; 1378 } 1379 Handle<mirror::String> 1380 location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str()))); 1381 if (location.Get() == NULL) { 1382 return NULL; 1383 } 1384 Handle<mirror::ObjectArray<mirror::String>> 1385 strings(hs.NewHandle(AllocStringArray(self, dex_file.NumStringIds()))); 1386 if (strings.Get() == NULL) { 1387 return NULL; 1388 } 1389 Handle<mirror::ObjectArray<mirror::Class>> 1390 types(hs.NewHandle(AllocClassArray(self, dex_file.NumTypeIds()))); 1391 if (types.Get() == NULL) { 1392 return NULL; 1393 } 1394 Handle<mirror::ObjectArray<mirror::ArtMethod>> 1395 methods(hs.NewHandle(AllocArtMethodArray(self, dex_file.NumMethodIds()))); 1396 if (methods.Get() == NULL) { 1397 return NULL; 1398 } 1399 Handle<mirror::ObjectArray<mirror::ArtField>> 1400 fields(hs.NewHandle(AllocArtFieldArray(self, dex_file.NumFieldIds()))); 1401 if (fields.Get() == NULL) { 1402 return NULL; 1403 } 1404 dex_cache->Init(&dex_file, location.Get(), strings.Get(), types.Get(), methods.Get(), 1405 fields.Get()); 1406 return dex_cache.Get(); 1407} 1408 1409// Used to initialize a class in the allocation code path to ensure it is guarded by a StoreStore 1410// fence. 1411class InitializeClassVisitor { 1412 public: 1413 explicit InitializeClassVisitor(uint32_t class_size) : class_size_(class_size) { 1414 } 1415 1416 void operator()(mirror::Object* obj, size_t usable_size) const 1417 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1418 DCHECK_LE(class_size_, usable_size); 1419 // Avoid AsClass as object is not yet in live bitmap or allocation stack. 1420 mirror::Class* klass = down_cast<mirror::Class*>(obj); 1421 // DCHECK(klass->IsClass()); 1422 klass->SetClassSize(class_size_); 1423 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive. 1424 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index. 1425 klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index. 1426 } 1427 1428 private: 1429 const uint32_t class_size_; 1430 1431 DISALLOW_COPY_AND_ASSIGN(InitializeClassVisitor); 1432}; 1433 1434mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class, 1435 uint32_t class_size) { 1436 DCHECK_GE(class_size, sizeof(mirror::Class)); 1437 gc::Heap* heap = Runtime::Current()->GetHeap(); 1438 InitializeClassVisitor visitor(class_size); 1439 mirror::Object* k = kMovingClasses ? 1440 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) : 1441 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor); 1442 if (UNLIKELY(k == nullptr)) { 1443 CHECK(self->IsExceptionPending()); // OOME. 1444 return nullptr; 1445 } 1446 return k->AsClass(); 1447} 1448 1449mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) { 1450 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size); 1451} 1452 1453mirror::ArtField* ClassLinker::AllocArtField(Thread* self) { 1454 return down_cast<mirror::ArtField*>( 1455 GetClassRoot(kJavaLangReflectArtField)->AllocNonMovableObject(self)); 1456} 1457 1458mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) { 1459 return down_cast<mirror::ArtMethod*>( 1460 GetClassRoot(kJavaLangReflectArtMethod)->AllocNonMovableObject(self)); 1461} 1462 1463mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray( 1464 Thread* self, size_t length) { 1465 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc( 1466 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length); 1467} 1468 1469static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass) 1470 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1471 DCHECK(klass != NULL); 1472 // Wait for the class if it has not already been linked. 1473 if (!klass->IsResolved() && !klass->IsErroneous()) { 1474 StackHandleScope<1> hs(self); 1475 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass)); 1476 ObjectLock<mirror::Class> lock(self, h_class); 1477 // Check for circular dependencies between classes. 1478 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) { 1479 ThrowClassCircularityError(h_class.Get()); 1480 h_class->SetStatus(mirror::Class::kStatusError, self); 1481 return nullptr; 1482 } 1483 // Wait for the pending initialization to complete. 1484 while (!h_class->IsResolved() && !h_class->IsErroneous()) { 1485 lock.WaitIgnoringInterrupts(); 1486 } 1487 } 1488 if (klass->IsErroneous()) { 1489 ThrowEarlierClassFailure(klass); 1490 return nullptr; 1491 } 1492 // Return the loaded class. No exceptions should be pending. 1493 CHECK(klass->IsResolved()) << PrettyClass(klass); 1494 self->AssertNoPendingException(); 1495 return klass; 1496} 1497 1498mirror::Class* ClassLinker::FindClass(Thread* self, const char* descriptor, 1499 Handle<mirror::ClassLoader> class_loader) { 1500 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string"; 1501 DCHECK(self != nullptr); 1502 self->AssertNoPendingException(); 1503 if (descriptor[1] == '\0') { 1504 // only the descriptors of primitive types should be 1 character long, also avoid class lookup 1505 // for primitive classes that aren't backed by dex files. 1506 return FindPrimitiveClass(descriptor[0]); 1507 } 1508 // Find the class in the loaded classes table. 1509 mirror::Class* klass = LookupClass(descriptor, class_loader.Get()); 1510 if (klass != NULL) { 1511 return EnsureResolved(self, klass); 1512 } 1513 // Class is not yet loaded. 1514 if (descriptor[0] == '[') { 1515 return CreateArrayClass(self, descriptor, class_loader); 1516 } else if (class_loader.Get() == nullptr) { 1517 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_); 1518 if (pair.second != NULL) { 1519 StackHandleScope<1> hs(self); 1520 return DefineClass(descriptor, NullHandle<mirror::ClassLoader>(), *pair.first, *pair.second); 1521 } 1522 } else if (Runtime::Current()->UseCompileTimeClassPath()) { 1523 // First try the boot class path, we check the descriptor first to avoid an unnecessary 1524 // throw of a NoClassDefFoundError. 1525 if (IsInBootClassPath(descriptor)) { 1526 mirror::Class* system_class = FindSystemClass(self, descriptor); 1527 CHECK(system_class != NULL); 1528 return system_class; 1529 } 1530 // Next try the compile time class path. 1531 const std::vector<const DexFile*>* class_path; 1532 { 1533 ScopedObjectAccessUnchecked soa(self); 1534 ScopedLocalRef<jobject> jclass_loader(soa.Env(), 1535 soa.AddLocalReference<jobject>(class_loader.Get())); 1536 class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get()); 1537 } 1538 1539 DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path); 1540 if (pair.second != NULL) { 1541 return DefineClass(descriptor, class_loader, *pair.first, *pair.second); 1542 } 1543 1544 } else { 1545 ScopedObjectAccessUnchecked soa(self); 1546 ScopedLocalRef<jobject> class_loader_object(soa.Env(), 1547 soa.AddLocalReference<jobject>(class_loader.Get())); 1548 std::string class_name_string(DescriptorToDot(descriptor)); 1549 ScopedLocalRef<jobject> result(soa.Env(), NULL); 1550 { 1551 ScopedThreadStateChange tsc(self, kNative); 1552 ScopedLocalRef<jobject> class_name_object(soa.Env(), 1553 soa.Env()->NewStringUTF(class_name_string.c_str())); 1554 if (class_name_object.get() == NULL) { 1555 return NULL; 1556 } 1557 CHECK(class_loader_object.get() != NULL); 1558 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(), 1559 WellKnownClasses::java_lang_ClassLoader_loadClass, 1560 class_name_object.get())); 1561 } 1562 if (self->IsExceptionPending()) { 1563 // If the ClassLoader threw, pass that exception up. 1564 return NULL; 1565 } else if (result.get() == NULL) { 1566 // broken loader - throw NPE to be compatible with Dalvik 1567 ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s", 1568 class_name_string.c_str()).c_str()); 1569 return NULL; 1570 } else { 1571 // success, return mirror::Class* 1572 return soa.Decode<mirror::Class*>(result.get()); 1573 } 1574 } 1575 1576 ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str()); 1577 return NULL; 1578} 1579 1580mirror::Class* ClassLinker::DefineClass(const char* descriptor, 1581 Handle<mirror::ClassLoader> class_loader, 1582 const DexFile& dex_file, 1583 const DexFile::ClassDef& dex_class_def) { 1584 Thread* self = Thread::Current(); 1585 StackHandleScope<2> hs(self); 1586 auto klass = hs.NewHandle<mirror::Class>(nullptr); 1587 // Load the class from the dex file. 1588 if (UNLIKELY(!init_done_)) { 1589 // finish up init of hand crafted class_roots_ 1590 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) { 1591 klass.Assign(GetClassRoot(kJavaLangObject)); 1592 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) { 1593 klass.Assign(GetClassRoot(kJavaLangClass)); 1594 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) { 1595 klass.Assign(GetClassRoot(kJavaLangString)); 1596 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) { 1597 klass.Assign(GetClassRoot(kJavaLangDexCache)); 1598 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) { 1599 klass.Assign(GetClassRoot(kJavaLangReflectArtField)); 1600 } else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) { 1601 klass.Assign(GetClassRoot(kJavaLangReflectArtMethod)); 1602 } else { 1603 klass.Assign(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1604 } 1605 } else { 1606 klass.Assign(AllocClass(self, SizeOfClass(dex_file, dex_class_def))); 1607 } 1608 if (UNLIKELY(klass.Get() == NULL)) { 1609 CHECK(self->IsExceptionPending()); // Expect an OOME. 1610 return NULL; 1611 } 1612 klass->SetDexCache(FindDexCache(dex_file)); 1613 LoadClass(dex_file, dex_class_def, klass, class_loader.Get()); 1614 // Check for a pending exception during load 1615 if (self->IsExceptionPending()) { 1616 klass->SetStatus(mirror::Class::kStatusError, self); 1617 return NULL; 1618 } 1619 ObjectLock<mirror::Class> lock(self, klass); 1620 klass->SetClinitThreadId(self->GetTid()); 1621 // Add the newly loaded class to the loaded classes table. 1622 mirror::Class* existing = InsertClass(descriptor, klass.Get(), Hash(descriptor)); 1623 if (existing != NULL) { 1624 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause 1625 // this thread to block. 1626 return EnsureResolved(self, existing); 1627 } 1628 // Finish loading (if necessary) by finding parents 1629 CHECK(!klass->IsLoaded()); 1630 if (!LoadSuperAndInterfaces(klass, dex_file)) { 1631 // Loading failed. 1632 klass->SetStatus(mirror::Class::kStatusError, self); 1633 return NULL; 1634 } 1635 CHECK(klass->IsLoaded()); 1636 // Link the class (if necessary) 1637 CHECK(!klass->IsResolved()); 1638 // TODO: Use fast jobjects? 1639 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr); 1640 if (!LinkClass(self, klass, interfaces)) { 1641 // Linking failed. 1642 klass->SetStatus(mirror::Class::kStatusError, self); 1643 return NULL; 1644 } 1645 CHECK(klass->IsResolved()); 1646 1647 /* 1648 * We send CLASS_PREPARE events to the debugger from here. The 1649 * definition of "preparation" is creating the static fields for a 1650 * class and initializing them to the standard default values, but not 1651 * executing any code (that comes later, during "initialization"). 1652 * 1653 * We did the static preparation in LinkClass. 1654 * 1655 * The class has been prepared and resolved but possibly not yet verified 1656 * at this point. 1657 */ 1658 Dbg::PostClassPrepare(klass.Get()); 1659 1660 return klass.Get(); 1661} 1662 1663// Precomputes size that will be needed for Class, matching LinkStaticFields 1664uint32_t ClassLinker::SizeOfClass(const DexFile& dex_file, 1665 const DexFile::ClassDef& dex_class_def) { 1666 const byte* class_data = dex_file.GetClassData(dex_class_def); 1667 size_t num_ref = 0; 1668 size_t num_32 = 0; 1669 size_t num_64 = 0; 1670 if (class_data != NULL) { 1671 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) { 1672 const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex()); 1673 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id); 1674 char c = descriptor[0]; 1675 if (c == 'L' || c == '[') { 1676 num_ref++; 1677 } else if (c == 'J' || c == 'D') { 1678 num_64++; 1679 } else { 1680 num_32++; 1681 } 1682 } 1683 } 1684 // start with generic class data 1685 uint32_t size = sizeof(mirror::Class); 1686 // follow with reference fields which must be contiguous at start 1687 size += (num_ref * sizeof(uint32_t)); 1688 // if there are 64-bit fields to add, make sure they are aligned 1689 if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment 1690 if (num_32 != 0) { 1691 // use an available 32-bit field for padding 1692 num_32--; 1693 } 1694 size += sizeof(uint32_t); // either way, we are adding a word 1695 DCHECK_EQ(size, RoundUp(size, 8)); 1696 } 1697 // tack on any 64-bit fields now that alignment is assured 1698 size += (num_64 * sizeof(uint64_t)); 1699 // tack on any remaining 32-bit fields 1700 size += (num_32 * sizeof(uint32_t)); 1701 return size; 1702} 1703 1704OatFile::OatClass ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) { 1705 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16); 1706 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 1707 CHECK(oat_file != NULL) << dex_file.GetLocation(); 1708 uint dex_location_checksum = dex_file.GetLocationChecksum(); 1709 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 1710 &dex_location_checksum); 1711 CHECK(oat_dex_file != NULL) << dex_file.GetLocation(); 1712 return oat_dex_file->GetOatClass(class_def_idx); 1713} 1714 1715static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx, 1716 uint32_t method_idx) { 1717 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx); 1718 const byte* class_data = dex_file.GetClassData(class_def); 1719 CHECK(class_data != NULL); 1720 ClassDataItemIterator it(dex_file, class_data); 1721 // Skip fields 1722 while (it.HasNextStaticField()) { 1723 it.Next(); 1724 } 1725 while (it.HasNextInstanceField()) { 1726 it.Next(); 1727 } 1728 // Process methods 1729 size_t class_def_method_index = 0; 1730 while (it.HasNextDirectMethod()) { 1731 if (it.GetMemberIndex() == method_idx) { 1732 return class_def_method_index; 1733 } 1734 class_def_method_index++; 1735 it.Next(); 1736 } 1737 while (it.HasNextVirtualMethod()) { 1738 if (it.GetMemberIndex() == method_idx) { 1739 return class_def_method_index; 1740 } 1741 class_def_method_index++; 1742 it.Next(); 1743 } 1744 DCHECK(!it.HasNext()); 1745 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation(); 1746 return 0; 1747} 1748 1749const OatFile::OatMethod ClassLinker::GetOatMethodFor(mirror::ArtMethod* method) { 1750 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution 1751 // method for direct methods (or virtual methods made direct). 1752 mirror::Class* declaring_class = method->GetDeclaringClass(); 1753 size_t oat_method_index; 1754 if (method->IsStatic() || method->IsDirect()) { 1755 // Simple case where the oat method index was stashed at load time. 1756 oat_method_index = method->GetMethodIndex(); 1757 } else { 1758 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index 1759 // by search for its position in the declared virtual methods. 1760 oat_method_index = declaring_class->NumDirectMethods(); 1761 size_t end = declaring_class->NumVirtualMethods(); 1762 bool found = false; 1763 for (size_t i = 0; i < end; i++) { 1764 if (declaring_class->GetVirtualMethod(i) == method) { 1765 found = true; 1766 break; 1767 } 1768 oat_method_index++; 1769 } 1770 CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method); 1771 } 1772 DCHECK_EQ(oat_method_index, 1773 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(), 1774 method->GetDeclaringClass()->GetDexClassDefIndex(), 1775 method->GetDexMethodIndex())); 1776 const OatFile::OatClass oat_class = GetOatClass(*declaring_class->GetDexCache()->GetDexFile(), 1777 declaring_class->GetDexClassDefIndex()); 1778 1779 return oat_class.GetOatMethod(oat_method_index); 1780} 1781 1782// Special case to get oat code without overwriting a trampoline. 1783const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) { 1784 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1785 if (method->IsProxyMethod()) { 1786 return GetQuickProxyInvokeHandler(); 1787 } 1788 const void* result = GetOatMethodFor(method).GetQuickCode(); 1789 if (result == nullptr) { 1790 if (method->IsNative()) { 1791 // No code and native? Use generic trampoline. 1792 result = GetQuickGenericJniTrampoline(); 1793 } else if (method->IsPortableCompiled()) { 1794 // No code? Do we expect portable code? 1795 result = GetQuickToPortableBridge(); 1796 } else { 1797 // No code? You must mean to go into the interpreter. 1798 result = GetQuickToInterpreterBridge(); 1799 } 1800 } 1801 return result; 1802} 1803 1804const void* ClassLinker::GetPortableOatCodeFor(mirror::ArtMethod* method, 1805 bool* have_portable_code) { 1806 CHECK(!method->IsAbstract()) << PrettyMethod(method); 1807 *have_portable_code = false; 1808 if (method->IsProxyMethod()) { 1809 return GetPortableProxyInvokeHandler(); 1810 } 1811 const OatFile::OatMethod oat_method = GetOatMethodFor(method); 1812 const void* result = oat_method.GetPortableCode(); 1813 if (result == nullptr) { 1814 if (oat_method.GetQuickCode() == nullptr) { 1815 // No code? You must mean to go into the interpreter. 1816 result = GetPortableToInterpreterBridge(); 1817 } else { 1818 // No code? But there's quick code, so use a bridge. 1819 result = GetPortableToQuickBridge(); 1820 } 1821 } else { 1822 *have_portable_code = true; 1823 } 1824 return result; 1825} 1826 1827const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1828 uint32_t method_idx) { 1829 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1830 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1831 return oat_class.GetOatMethod(oat_method_idx).GetQuickCode(); 1832} 1833 1834const void* ClassLinker::GetPortableOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, 1835 uint32_t method_idx) { 1836 const OatFile::OatClass oat_class = GetOatClass(dex_file, class_def_idx); 1837 uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx); 1838 return oat_class.GetOatMethod(oat_method_idx).GetPortableCode(); 1839} 1840 1841// Returns true if the method must run with interpreter, false otherwise. 1842static bool NeedsInterpreter( 1843 mirror::ArtMethod* method, const void* quick_code, const void* portable_code) 1844 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1845 if ((quick_code == nullptr) && (portable_code == nullptr)) { 1846 // No code: need interpreter. 1847 // May return true for native code, in the case of generic JNI 1848 // DCHECK(!method->IsNative()); 1849 return true; 1850 } 1851#ifdef ART_SEA_IR_MODE 1852 ScopedObjectAccess soa(Thread::Current()); 1853 if (std::string::npos != PrettyMethod(method).find("fibonacci")) { 1854 LOG(INFO) << "Found " << PrettyMethod(method); 1855 return false; 1856 } 1857#endif 1858 // If interpreter mode is enabled, every method (except native and proxy) must 1859 // be run with interpreter. 1860 return Runtime::Current()->GetInstrumentation()->InterpretOnly() && 1861 !method->IsNative() && !method->IsProxyMethod(); 1862} 1863 1864void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) { 1865 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass); 1866 if (klass->NumDirectMethods() == 0) { 1867 return; // No direct methods => no static methods. 1868 } 1869 Runtime* runtime = Runtime::Current(); 1870 if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) { 1871 return; // OAT file unavailable. 1872 } 1873 const DexFile& dex_file = klass->GetDexFile(); 1874 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 1875 CHECK(dex_class_def != nullptr); 1876 const byte* class_data = dex_file.GetClassData(*dex_class_def); 1877 // There should always be class data if there were direct methods. 1878 CHECK(class_data != nullptr) << PrettyDescriptor(klass); 1879 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 1880 ClassDataItemIterator it(dex_file, class_data); 1881 // Skip fields 1882 while (it.HasNextStaticField()) { 1883 it.Next(); 1884 } 1885 while (it.HasNextInstanceField()) { 1886 it.Next(); 1887 } 1888 // Link the code of methods skipped by LinkCode. 1889 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) { 1890 mirror::ArtMethod* method = klass->GetDirectMethod(method_index); 1891 if (!method->IsStatic()) { 1892 // Only update static methods. 1893 continue; 1894 } 1895 const void* portable_code = oat_class.GetOatMethod(method_index).GetPortableCode(); 1896 const void* quick_code = oat_class.GetOatMethod(method_index).GetQuickCode(); 1897 const bool enter_interpreter = NeedsInterpreter(method, quick_code, portable_code); 1898 bool have_portable_code = false; 1899 if (enter_interpreter) { 1900 // Use interpreter entry point. 1901 // Check whether the method is native, in which case it's generic JNI. 1902 if (quick_code == nullptr && portable_code == nullptr && method->IsNative()) { 1903 quick_code = GetQuickGenericJniTrampoline(); 1904 portable_code = GetPortableToQuickBridge(); 1905 } else { 1906 portable_code = GetPortableToInterpreterBridge(); 1907 quick_code = GetQuickToInterpreterBridge(); 1908 } 1909 } else { 1910 if (portable_code == nullptr) { 1911 portable_code = GetPortableToQuickBridge(); 1912 } else { 1913 have_portable_code = true; 1914 } 1915 if (quick_code == nullptr) { 1916 quick_code = GetQuickToPortableBridge(); 1917 } 1918 } 1919 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code, portable_code, 1920 have_portable_code); 1921 } 1922 // Ignore virtual methods on the iterator. 1923} 1924 1925void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class, 1926 const DexFile& dex_file, uint32_t dex_method_index, 1927 uint32_t method_index) { 1928 // Method shouldn't have already been linked. 1929 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1930 DCHECK(method->GetEntryPointFromPortableCompiledCode() == nullptr); 1931 // Every kind of method should at least get an invoke stub from the oat_method. 1932 // non-abstract methods also get their code pointers. 1933 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index); 1934 oat_method.LinkMethod(method.Get()); 1935 1936 // Install entry point from interpreter. 1937 Runtime* runtime = Runtime::Current(); 1938 bool enter_interpreter = NeedsInterpreter(method.Get(), 1939 method->GetEntryPointFromQuickCompiledCode(), 1940 method->GetEntryPointFromPortableCompiledCode()); 1941 if (enter_interpreter && !method->IsNative()) { 1942 method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge); 1943 } else { 1944 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 1945 } 1946 1947 if (method->IsAbstract()) { 1948 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1949 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1950 return; 1951 } 1952 1953 bool have_portable_code = false; 1954 if (method->IsStatic() && !method->IsConstructor()) { 1955 // For static methods excluding the class initializer, install the trampoline. 1956 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines 1957 // after initializing class (see ClassLinker::InitializeClass method). 1958 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionTrampoline()); 1959 method->SetEntryPointFromPortableCompiledCode(GetPortableResolutionTrampoline()); 1960 } else if (enter_interpreter) { 1961 if (!method->IsNative()) { 1962 // Set entry point from compiled code if there's no code or in interpreter only mode. 1963 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge()); 1964 method->SetEntryPointFromPortableCompiledCode(GetPortableToInterpreterBridge()); 1965 } else { 1966 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniTrampoline()); 1967 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1968 } 1969 } else if (method->GetEntryPointFromPortableCompiledCode() != nullptr) { 1970 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr); 1971 have_portable_code = true; 1972 method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge()); 1973 } else { 1974 DCHECK(method->GetEntryPointFromQuickCompiledCode() != nullptr); 1975 method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge()); 1976 } 1977 1978 if (method->IsNative()) { 1979 // Unregistering restores the dlsym lookup stub. 1980 method->UnregisterNative(Thread::Current()); 1981 1982 if (enter_interpreter) { 1983 // We have a native method here without code. Then it should have either the GenericJni 1984 // trampoline as entrypoint (non-static), or the Resolution trampoline (static). 1985 DCHECK(method->GetEntryPointFromQuickCompiledCode() == GetQuickResolutionTrampoline() 1986 || method->GetEntryPointFromQuickCompiledCode() == GetQuickGenericJniTrampoline()); 1987 } 1988 } 1989 1990 // Allow instrumentation its chance to hijack code. 1991 runtime->GetInstrumentation()->UpdateMethodsCode(method.Get(), 1992 method->GetEntryPointFromQuickCompiledCode(), 1993 method->GetEntryPointFromPortableCompiledCode(), 1994 have_portable_code); 1995} 1996 1997void ClassLinker::LoadClass(const DexFile& dex_file, 1998 const DexFile::ClassDef& dex_class_def, 1999 Handle<mirror::Class> klass, 2000 mirror::ClassLoader* class_loader) { 2001 CHECK(klass.Get() != NULL); 2002 CHECK(klass->GetDexCache() != NULL); 2003 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus()); 2004 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def); 2005 CHECK(descriptor != NULL); 2006 2007 klass->SetClass(GetClassRoot(kJavaLangClass)); 2008 if (kUseBakerOrBrooksReadBarrier) { 2009 klass->AssertReadBarrierPointer(); 2010 } 2011 uint32_t access_flags = dex_class_def.access_flags_; 2012 // Make sure that none of our runtime-only flags are set. 2013 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U); 2014 klass->SetAccessFlags(access_flags); 2015 klass->SetClassLoader(class_loader); 2016 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2017 klass->SetStatus(mirror::Class::kStatusIdx, NULL); 2018 2019 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def)); 2020 klass->SetDexTypeIndex(dex_class_def.class_idx_); 2021 2022 const byte* class_data = dex_file.GetClassData(dex_class_def); 2023 if (class_data == NULL) { 2024 return; // no fields or methods - for example a marker interface 2025 } 2026 2027 if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) { 2028 const OatFile::OatClass oat_class = GetOatClass(dex_file, klass->GetDexClassDefIndex()); 2029 LoadClassMembers(dex_file, class_data, klass, class_loader, &oat_class); 2030 } else { 2031 LoadClassMembers(dex_file, class_data, klass, class_loader, nullptr); 2032 } 2033} 2034 2035void ClassLinker::LoadClassMembers(const DexFile& dex_file, 2036 const byte* class_data, 2037 Handle<mirror::Class> klass, 2038 mirror::ClassLoader* class_loader, 2039 const OatFile::OatClass* oat_class) { 2040 // Load fields. 2041 ClassDataItemIterator it(dex_file, class_data); 2042 Thread* self = Thread::Current(); 2043 if (it.NumStaticFields() != 0) { 2044 mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields()); 2045 if (UNLIKELY(statics == NULL)) { 2046 CHECK(self->IsExceptionPending()); // OOME. 2047 return; 2048 } 2049 klass->SetSFields(statics); 2050 } 2051 if (it.NumInstanceFields() != 0) { 2052 mirror::ObjectArray<mirror::ArtField>* fields = 2053 AllocArtFieldArray(self, it.NumInstanceFields()); 2054 if (UNLIKELY(fields == NULL)) { 2055 CHECK(self->IsExceptionPending()); // OOME. 2056 return; 2057 } 2058 klass->SetIFields(fields); 2059 } 2060 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 2061 StackHandleScope<1> hs(self); 2062 Handle<mirror::ArtField> sfield(hs.NewHandle(AllocArtField(self))); 2063 if (UNLIKELY(sfield.Get() == NULL)) { 2064 CHECK(self->IsExceptionPending()); // OOME. 2065 return; 2066 } 2067 klass->SetStaticField(i, sfield.Get()); 2068 LoadField(dex_file, it, klass, sfield); 2069 } 2070 for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) { 2071 StackHandleScope<1> hs(self); 2072 Handle<mirror::ArtField> ifield(hs.NewHandle(AllocArtField(self))); 2073 if (UNLIKELY(ifield.Get() == NULL)) { 2074 CHECK(self->IsExceptionPending()); // OOME. 2075 return; 2076 } 2077 klass->SetInstanceField(i, ifield.Get()); 2078 LoadField(dex_file, it, klass, ifield); 2079 } 2080 2081 // Load methods. 2082 if (it.NumDirectMethods() != 0) { 2083 // TODO: append direct methods to class object 2084 mirror::ObjectArray<mirror::ArtMethod>* directs = 2085 AllocArtMethodArray(self, it.NumDirectMethods()); 2086 if (UNLIKELY(directs == NULL)) { 2087 CHECK(self->IsExceptionPending()); // OOME. 2088 return; 2089 } 2090 klass->SetDirectMethods(directs); 2091 } 2092 if (it.NumVirtualMethods() != 0) { 2093 // TODO: append direct methods to class object 2094 mirror::ObjectArray<mirror::ArtMethod>* virtuals = 2095 AllocArtMethodArray(self, it.NumVirtualMethods()); 2096 if (UNLIKELY(virtuals == NULL)) { 2097 CHECK(self->IsExceptionPending()); // OOME. 2098 return; 2099 } 2100 klass->SetVirtualMethods(virtuals); 2101 } 2102 size_t class_def_method_index = 0; 2103 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) { 2104 StackHandleScope<1> hs(self); 2105 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2106 if (UNLIKELY(method.Get() == NULL)) { 2107 CHECK(self->IsExceptionPending()); // OOME. 2108 return; 2109 } 2110 klass->SetDirectMethod(i, method.Get()); 2111 if (oat_class != nullptr) { 2112 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2113 } 2114 method->SetMethodIndex(class_def_method_index); 2115 class_def_method_index++; 2116 } 2117 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) { 2118 StackHandleScope<1> hs(self); 2119 Handle<mirror::ArtMethod> method(hs.NewHandle(LoadMethod(self, dex_file, it, klass))); 2120 if (UNLIKELY(method.Get() == NULL)) { 2121 CHECK(self->IsExceptionPending()); // OOME. 2122 return; 2123 } 2124 klass->SetVirtualMethod(i, method.Get()); 2125 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i); 2126 if (oat_class != nullptr) { 2127 LinkCode(method, oat_class, dex_file, it.GetMemberIndex(), class_def_method_index); 2128 } 2129 class_def_method_index++; 2130 } 2131 DCHECK(!it.HasNext()); 2132} 2133 2134void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it, 2135 Handle<mirror::Class> klass, Handle<mirror::ArtField> dst) { 2136 uint32_t field_idx = it.GetMemberIndex(); 2137 dst->SetDexFieldIndex(field_idx); 2138 dst->SetDeclaringClass(klass.Get()); 2139 dst->SetAccessFlags(it.GetMemberAccessFlags()); 2140} 2141 2142mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file, 2143 const ClassDataItemIterator& it, 2144 Handle<mirror::Class> klass) { 2145 uint32_t dex_method_idx = it.GetMemberIndex(); 2146 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx); 2147 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_); 2148 2149 mirror::ArtMethod* dst = AllocArtMethod(self); 2150 if (UNLIKELY(dst == NULL)) { 2151 CHECK(self->IsExceptionPending()); // OOME. 2152 return NULL; 2153 } 2154 DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass()); 2155 2156 const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod"); 2157 dst->SetDexMethodIndex(dex_method_idx); 2158 dst->SetDeclaringClass(klass.Get()); 2159 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset()); 2160 2161 dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings()); 2162 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods()); 2163 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes()); 2164 2165 uint32_t access_flags = it.GetMemberAccessFlags(); 2166 2167 if (UNLIKELY(strcmp("finalize", method_name) == 0)) { 2168 // Set finalizable flag on declaring class. 2169 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) { 2170 // Void return type. 2171 if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged 2172 klass->SetFinalizable(); 2173 } else { 2174 std::string klass_descriptor = klass->GetDescriptor(); 2175 // The Enum class declares a "final" finalize() method to prevent subclasses from 2176 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its 2177 // subclasses, so we exclude it here. 2178 // We also want to avoid setting the flag on Object, where we know that finalize() is 2179 // empty. 2180 if (klass_descriptor.compare("Ljava/lang/Object;") != 0 && 2181 klass_descriptor.compare("Ljava/lang/Enum;") != 0) { 2182 klass->SetFinalizable(); 2183 } 2184 } 2185 } 2186 } else if (method_name[0] == '<') { 2187 // Fix broken access flags for initializers. Bug 11157540. 2188 bool is_init = (strcmp("<init>", method_name) == 0); 2189 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0); 2190 if (UNLIKELY(!is_init && !is_clinit)) { 2191 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name; 2192 } else { 2193 if (UNLIKELY((access_flags & kAccConstructor) == 0)) { 2194 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class " 2195 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation(); 2196 access_flags |= kAccConstructor; 2197 } 2198 } 2199 } 2200 dst->SetAccessFlags(access_flags); 2201 2202 self->EndAssertNoThreadSuspension(old_cause); 2203 return dst; 2204} 2205 2206void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) { 2207 Thread* self = Thread::Current(); 2208 StackHandleScope<1> hs(self); 2209 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2210 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2211 AppendToBootClassPath(dex_file, dex_cache); 2212} 2213 2214void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, 2215 Handle<mirror::DexCache> dex_cache) { 2216 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2217 boot_class_path_.push_back(&dex_file); 2218 RegisterDexFile(dex_file, dex_cache); 2219} 2220 2221bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) { 2222 dex_lock_.AssertSharedHeld(Thread::Current()); 2223 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2224 mirror::DexCache* dex_cache = GetDexCache(i); 2225 if (dex_cache->GetDexFile() == &dex_file) { 2226 return true; 2227 } 2228 } 2229 return false; 2230} 2231 2232bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) { 2233 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2234 return IsDexFileRegisteredLocked(dex_file); 2235} 2236 2237void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, 2238 Handle<mirror::DexCache> dex_cache) { 2239 dex_lock_.AssertExclusiveHeld(Thread::Current()); 2240 CHECK(dex_cache.Get() != NULL) << dex_file.GetLocation(); 2241 CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation())) 2242 << dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation(); 2243 dex_caches_.push_back(dex_cache.Get()); 2244 dex_cache->SetDexFile(&dex_file); 2245 if (log_new_dex_caches_roots_) { 2246 // TODO: This is not safe if we can remove dex caches. 2247 new_dex_cache_roots_.push_back(dex_caches_.size() - 1); 2248 } 2249} 2250 2251void ClassLinker::RegisterDexFile(const DexFile& dex_file) { 2252 Thread* self = Thread::Current(); 2253 { 2254 ReaderMutexLock mu(self, dex_lock_); 2255 if (IsDexFileRegisteredLocked(dex_file)) { 2256 return; 2257 } 2258 } 2259 // Don't alloc while holding the lock, since allocation may need to 2260 // suspend all threads and another thread may need the dex_lock_ to 2261 // get to a suspend point. 2262 StackHandleScope<1> hs(self); 2263 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(self, dex_file))); 2264 CHECK(dex_cache.Get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation(); 2265 { 2266 WriterMutexLock mu(self, dex_lock_); 2267 if (IsDexFileRegisteredLocked(dex_file)) { 2268 return; 2269 } 2270 RegisterDexFileLocked(dex_file, dex_cache); 2271 } 2272} 2273 2274void ClassLinker::RegisterDexFile(const DexFile& dex_file, 2275 Handle<mirror::DexCache> dex_cache) { 2276 WriterMutexLock mu(Thread::Current(), dex_lock_); 2277 RegisterDexFileLocked(dex_file, dex_cache); 2278} 2279 2280mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) { 2281 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2282 // Search assuming unique-ness of dex file. 2283 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2284 mirror::DexCache* dex_cache = GetDexCache(i); 2285 if (dex_cache->GetDexFile() == &dex_file) { 2286 return dex_cache; 2287 } 2288 } 2289 // Search matching by location name. 2290 std::string location(dex_file.GetLocation()); 2291 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2292 mirror::DexCache* dex_cache = GetDexCache(i); 2293 if (dex_cache->GetDexFile()->GetLocation() == location) { 2294 return dex_cache; 2295 } 2296 } 2297 // Failure, dump diagnostic and abort. 2298 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2299 mirror::DexCache* dex_cache = GetDexCache(i); 2300 LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation(); 2301 } 2302 LOG(FATAL) << "Failed to find DexCache for DexFile " << location; 2303 return NULL; 2304} 2305 2306void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) { 2307 ReaderMutexLock mu(Thread::Current(), dex_lock_); 2308 for (size_t i = 0; i != dex_caches_.size(); ++i) { 2309 mirror::DexCache* dex_cache = GetDexCache(i); 2310 dex_cache->Fixup(resolution_method); 2311 } 2312} 2313 2314mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) { 2315 mirror::Class* klass = AllocClass(self, sizeof(mirror::Class)); 2316 if (UNLIKELY(klass == NULL)) { 2317 return NULL; 2318 } 2319 return InitializePrimitiveClass(klass, type); 2320} 2321 2322mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, 2323 Primitive::Type type) { 2324 CHECK(primitive_class != NULL); 2325 // Must hold lock on object when initializing. 2326 Thread* self = Thread::Current(); 2327 StackHandleScope<1> hs(self); 2328 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class)); 2329 ObjectLock<mirror::Class> lock(self, h_class); 2330 primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract); 2331 primitive_class->SetPrimitiveType(type); 2332 primitive_class->SetStatus(mirror::Class::kStatusInitialized, self); 2333 const char* descriptor = Primitive::Descriptor(type); 2334 mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor)); 2335 CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed"; 2336 return primitive_class; 2337} 2338 2339// Create an array class (i.e. the class object for the array, not the 2340// array itself). "descriptor" looks like "[C" or "[[[[B" or 2341// "[Ljava/lang/String;". 2342// 2343// If "descriptor" refers to an array of primitives, look up the 2344// primitive type's internally-generated class object. 2345// 2346// "class_loader" is the class loader of the class that's referring to 2347// us. It's used to ensure that we're looking for the element type in 2348// the right context. It does NOT become the class loader for the 2349// array class; that always comes from the base element class. 2350// 2351// Returns NULL with an exception raised on failure. 2352mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, 2353 Handle<mirror::ClassLoader> class_loader) { 2354 // Identify the underlying component type 2355 CHECK_EQ('[', descriptor[0]); 2356 StackHandleScope<2> hs(self); 2357 Handle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1, class_loader))); 2358 if (component_type.Get() == nullptr) { 2359 DCHECK(self->IsExceptionPending()); 2360 return nullptr; 2361 } 2362 if (UNLIKELY(component_type->IsPrimitiveVoid())) { 2363 ThrowNoClassDefFoundError("Attempt to create array of void primitive type"); 2364 return nullptr; 2365 } 2366 // See if the component type is already loaded. Array classes are 2367 // always associated with the class loader of their underlying 2368 // element type -- an array of Strings goes with the loader for 2369 // java/lang/String -- so we need to look for it there. (The 2370 // caller should have checked for the existence of the class 2371 // before calling here, but they did so with *their* class loader, 2372 // not the component type's loader.) 2373 // 2374 // If we find it, the caller adds "loader" to the class' initiating 2375 // loader list, which should prevent us from going through this again. 2376 // 2377 // This call is unnecessary if "loader" and "component_type->GetClassLoader()" 2378 // are the same, because our caller (FindClass) just did the 2379 // lookup. (Even if we get this wrong we still have correct behavior, 2380 // because we effectively do this lookup again when we add the new 2381 // class to the hash table --- necessary because of possible races with 2382 // other threads.) 2383 if (class_loader.Get() != component_type->GetClassLoader()) { 2384 mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader()); 2385 if (new_class != NULL) { 2386 return new_class; 2387 } 2388 } 2389 2390 // Fill out the fields in the Class. 2391 // 2392 // It is possible to execute some methods against arrays, because 2393 // all arrays are subclasses of java_lang_Object_, so we need to set 2394 // up a vtable. We can just point at the one in java_lang_Object_. 2395 // 2396 // Array classes are simple enough that we don't need to do a full 2397 // link step. 2398 auto new_class = hs.NewHandle<mirror::Class>(nullptr); 2399 if (UNLIKELY(!init_done_)) { 2400 // Classes that were hand created, ie not by FindSystemClass 2401 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) { 2402 new_class.Assign(GetClassRoot(kClassArrayClass)); 2403 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) { 2404 new_class.Assign(GetClassRoot(kObjectArrayClass)); 2405 } else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) { 2406 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass)); 2407 } else if (strcmp(descriptor, 2408 class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) { 2409 new_class.Assign(GetClassRoot(kJavaLangReflectArtMethodArrayClass)); 2410 } else if (strcmp(descriptor, 2411 class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) { 2412 new_class.Assign(GetClassRoot(kJavaLangReflectArtFieldArrayClass)); 2413 } else if (strcmp(descriptor, "[C") == 0) { 2414 new_class.Assign(GetClassRoot(kCharArrayClass)); 2415 } else if (strcmp(descriptor, "[I") == 0) { 2416 new_class.Assign(GetClassRoot(kIntArrayClass)); 2417 } 2418 } 2419 if (new_class.Get() == nullptr) { 2420 new_class.Assign(AllocClass(self, sizeof(mirror::Class))); 2421 if (new_class.Get() == nullptr) { 2422 return nullptr; 2423 } 2424 new_class->SetComponentType(component_type.Get()); 2425 } 2426 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing. 2427 DCHECK(new_class->GetComponentType() != NULL); 2428 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject); 2429 new_class->SetSuperClass(java_lang_Object); 2430 new_class->SetVTable(java_lang_Object->GetVTable()); 2431 new_class->SetPrimitiveType(Primitive::kPrimNot); 2432 new_class->SetClassLoader(component_type->GetClassLoader()); 2433 new_class->SetStatus(mirror::Class::kStatusInitialized, self); 2434 // don't need to set new_class->SetObjectSize(..) 2435 // because Object::SizeOf delegates to Array::SizeOf 2436 2437 2438 // All arrays have java/lang/Cloneable and java/io/Serializable as 2439 // interfaces. We need to set that up here, so that stuff like 2440 // "instanceof" works right. 2441 // 2442 // Note: The GC could run during the call to FindSystemClass, 2443 // so we need to make sure the class object is GC-valid while we're in 2444 // there. Do this by clearing the interface list so the GC will just 2445 // think that the entries are null. 2446 2447 2448 // Use the single, global copies of "interfaces" and "iftable" 2449 // (remember not to free them for arrays). 2450 { 2451 mirror::IfTable* array_iftable = 2452 ReadBarrier::BarrierForRoot<mirror::IfTable, kWithReadBarrier>(&array_iftable_); 2453 CHECK(array_iftable != nullptr); 2454 new_class->SetIfTable(array_iftable); 2455 } 2456 2457 // Inherit access flags from the component type. 2458 int access_flags = new_class->GetComponentType()->GetAccessFlags(); 2459 // Lose any implementation detail flags; in particular, arrays aren't finalizable. 2460 access_flags &= kAccJavaFlagsMask; 2461 // Arrays can't be used as a superclass or interface, so we want to add "abstract final" 2462 // and remove "interface". 2463 access_flags |= kAccAbstract | kAccFinal; 2464 access_flags &= ~kAccInterface; 2465 2466 new_class->SetAccessFlags(access_flags); 2467 2468 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), Hash(descriptor)); 2469 if (existing == nullptr) { 2470 return new_class.Get(); 2471 } 2472 // Another thread must have loaded the class after we 2473 // started but before we finished. Abandon what we've 2474 // done. 2475 // 2476 // (Yes, this happens.) 2477 2478 return existing; 2479} 2480 2481mirror::Class* ClassLinker::FindPrimitiveClass(char type) { 2482 switch (type) { 2483 case 'B': 2484 return GetClassRoot(kPrimitiveByte); 2485 case 'C': 2486 return GetClassRoot(kPrimitiveChar); 2487 case 'D': 2488 return GetClassRoot(kPrimitiveDouble); 2489 case 'F': 2490 return GetClassRoot(kPrimitiveFloat); 2491 case 'I': 2492 return GetClassRoot(kPrimitiveInt); 2493 case 'J': 2494 return GetClassRoot(kPrimitiveLong); 2495 case 'S': 2496 return GetClassRoot(kPrimitiveShort); 2497 case 'Z': 2498 return GetClassRoot(kPrimitiveBoolean); 2499 case 'V': 2500 return GetClassRoot(kPrimitiveVoid); 2501 default: 2502 break; 2503 } 2504 std::string printable_type(PrintableChar(type)); 2505 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str()); 2506 return NULL; 2507} 2508 2509mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, 2510 size_t hash) { 2511 if (VLOG_IS_ON(class_linker)) { 2512 mirror::DexCache* dex_cache = klass->GetDexCache(); 2513 std::string source; 2514 if (dex_cache != NULL) { 2515 source += " from "; 2516 source += dex_cache->GetLocation()->ToModifiedUtf8(); 2517 } 2518 LOG(INFO) << "Loaded class " << descriptor << source; 2519 } 2520 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2521 mirror::Class* existing = 2522 LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash); 2523 if (existing != NULL) { 2524 return existing; 2525 } 2526 if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) { 2527 // Check a class loaded with the system class loader matches one in the image if the class 2528 // is in the image. 2529 existing = LookupClassFromImage(descriptor); 2530 if (existing != NULL) { 2531 CHECK(klass == existing); 2532 } 2533 } 2534 VerifyObject(klass); 2535 class_table_.insert(std::make_pair(hash, klass)); 2536 if (log_new_class_table_roots_) { 2537 new_class_roots_.push_back(std::make_pair(hash, klass)); 2538 } 2539 return NULL; 2540} 2541 2542bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) { 2543 size_t hash = Hash(descriptor); 2544 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2545 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2546 it != end && it->first == hash; 2547 ++it) { 2548 mirror::Class** root = &it->second; 2549 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2550 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2551 class_table_.erase(it); 2552 return true; 2553 } 2554 } 2555 return false; 2556} 2557 2558mirror::Class* ClassLinker::LookupClass(const char* descriptor, 2559 const mirror::ClassLoader* class_loader) { 2560 size_t hash = Hash(descriptor); 2561 { 2562 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2563 mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash); 2564 if (result != NULL) { 2565 return result; 2566 } 2567 } 2568 if (class_loader != NULL || !dex_cache_image_class_lookup_required_) { 2569 return NULL; 2570 } else { 2571 // Lookup failed but need to search dex_caches_. 2572 mirror::Class* result = LookupClassFromImage(descriptor); 2573 if (result != NULL) { 2574 InsertClass(descriptor, result, hash); 2575 } else { 2576 // Searching the image dex files/caches failed, we don't want to get into this situation 2577 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image 2578 // classes into the class table. 2579 const int32_t kMaxFailedDexCacheLookups = 1000; 2580 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) { 2581 MoveImageClassesToClassTable(); 2582 } 2583 } 2584 return result; 2585 } 2586} 2587 2588mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor, 2589 const mirror::ClassLoader* class_loader, 2590 size_t hash) { 2591 auto end = class_table_.end(); 2592 for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) { 2593 mirror::Class** root = &it->second; 2594 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2595 if (klass->GetClassLoader() == class_loader && klass->DescriptorEquals(descriptor)) { 2596 if (kIsDebugBuild) { 2597 // Check for duplicates in the table. 2598 for (++it; it != end && it->first == hash; ++it) { 2599 mirror::Class** root2 = &it->second; 2600 mirror::Class* klass2 = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root2); 2601 CHECK(!(klass2->GetClassLoader() == class_loader && 2602 klass2->DescriptorEquals(descriptor))) 2603 << PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " " 2604 << PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader(); 2605 } 2606 } 2607 return klass; 2608 } 2609 } 2610 return NULL; 2611} 2612 2613static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches() 2614 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2615 gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace(); 2616 CHECK(image != NULL); 2617 mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches); 2618 return root->AsObjectArray<mirror::DexCache>(); 2619} 2620 2621void ClassLinker::MoveImageClassesToClassTable() { 2622 Thread* self = Thread::Current(); 2623 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_); 2624 if (!dex_cache_image_class_lookup_required_) { 2625 return; // All dex cache classes are already in the class table. 2626 } 2627 const char* old_no_suspend_cause = 2628 self->StartAssertNoThreadSuspension("Moving image classes to class table"); 2629 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2630 for (int32_t i = 0; i < dex_caches->GetLength(); i++) { 2631 mirror::DexCache* dex_cache = dex_caches->Get(i); 2632 mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes(); 2633 for (int32_t j = 0; j < types->GetLength(); j++) { 2634 mirror::Class* klass = types->Get(j); 2635 if (klass != NULL) { 2636 DCHECK(klass->GetClassLoader() == NULL); 2637 std::string descriptor = klass->GetDescriptor(); 2638 size_t hash = Hash(descriptor.c_str()); 2639 mirror::Class* existing = LookupClassFromTableLocked(descriptor.c_str(), NULL, hash); 2640 if (existing != NULL) { 2641 CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != " 2642 << PrettyClassAndClassLoader(klass); 2643 } else { 2644 class_table_.insert(std::make_pair(hash, klass)); 2645 if (log_new_class_table_roots_) { 2646 new_class_roots_.push_back(std::make_pair(hash, klass)); 2647 } 2648 } 2649 } 2650 } 2651 } 2652 dex_cache_image_class_lookup_required_ = false; 2653 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2654} 2655 2656mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) { 2657 Thread* self = Thread::Current(); 2658 const char* old_no_suspend_cause = 2659 self->StartAssertNoThreadSuspension("Image class lookup"); 2660 mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches(); 2661 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) { 2662 mirror::DexCache* dex_cache = dex_caches->Get(i); 2663 const DexFile* dex_file = dex_cache->GetDexFile(); 2664 // Try binary searching the string/type index. 2665 const DexFile::StringId* string_id = dex_file->FindStringId(descriptor); 2666 if (string_id != NULL) { 2667 const DexFile::TypeId* type_id = 2668 dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id)); 2669 if (type_id != NULL) { 2670 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id); 2671 mirror::Class* klass = dex_cache->GetResolvedType(type_idx); 2672 if (klass != NULL) { 2673 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2674 return klass; 2675 } 2676 } 2677 } 2678 } 2679 self->EndAssertNoThreadSuspension(old_no_suspend_cause); 2680 return NULL; 2681} 2682 2683void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) { 2684 result.clear(); 2685 if (dex_cache_image_class_lookup_required_) { 2686 MoveImageClassesToClassTable(); 2687 } 2688 size_t hash = Hash(descriptor); 2689 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 2690 for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); 2691 it != end && it->first == hash; ++it) { 2692 mirror::Class** root = &it->second; 2693 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 2694 if (klass->DescriptorEquals(descriptor)) { 2695 result.push_back(klass); 2696 } 2697 } 2698} 2699 2700void ClassLinker::VerifyClass(Handle<mirror::Class> klass) { 2701 // TODO: assert that the monitor on the Class is held 2702 Thread* self = Thread::Current(); 2703 ObjectLock<mirror::Class> lock(self, klass); 2704 2705 // Don't attempt to re-verify if already sufficiently verified. 2706 if (klass->IsVerified() || 2707 (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler())) { 2708 return; 2709 } 2710 2711 // The class might already be erroneous, for example at compile time if we attempted to verify 2712 // this class as a parent to another. 2713 if (klass->IsErroneous()) { 2714 ThrowEarlierClassFailure(klass.Get()); 2715 return; 2716 } 2717 2718 if (klass->GetStatus() == mirror::Class::kStatusResolved) { 2719 klass->SetStatus(mirror::Class::kStatusVerifying, self); 2720 } else { 2721 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime) 2722 << PrettyClass(klass.Get()); 2723 CHECK(!Runtime::Current()->IsCompiler()); 2724 klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self); 2725 } 2726 2727 // Skip verification if disabled. 2728 if (!Runtime::Current()->IsVerificationEnabled()) { 2729 klass->SetStatus(mirror::Class::kStatusVerified, self); 2730 return; 2731 } 2732 2733 // Verify super class. 2734 StackHandleScope<2> hs(self); 2735 Handle<mirror::Class> super(hs.NewHandle(klass->GetSuperClass())); 2736 if (super.Get() != NULL) { 2737 // Acquire lock to prevent races on verifying the super class. 2738 ObjectLock<mirror::Class> lock(self, super); 2739 2740 if (!super->IsVerified() && !super->IsErroneous()) { 2741 VerifyClass(super); 2742 } 2743 if (!super->IsCompileTimeVerified()) { 2744 std::string error_msg( 2745 StringPrintf("Rejecting class %s that attempts to sub-class erroneous class %s", 2746 PrettyDescriptor(klass.Get()).c_str(), 2747 PrettyDescriptor(super.Get()).c_str())); 2748 LOG(ERROR) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2749 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 2750 if (cause.Get() != nullptr) { 2751 self->ClearException(); 2752 } 2753 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2754 if (cause.Get() != nullptr) { 2755 self->GetException(nullptr)->SetCause(cause.Get()); 2756 } 2757 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex()); 2758 if (Runtime::Current()->IsCompiler()) { 2759 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref); 2760 } 2761 klass->SetStatus(mirror::Class::kStatusError, self); 2762 return; 2763 } 2764 } 2765 2766 // Try to use verification information from the oat file, otherwise do runtime verification. 2767 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile(); 2768 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady); 2769 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status); 2770 if (oat_file_class_status == mirror::Class::kStatusError) { 2771 VLOG(class_linker) << "Skipping runtime verification of erroneous class " 2772 << PrettyDescriptor(klass.Get()) << " in " 2773 << klass->GetDexCache()->GetLocation()->ToModifiedUtf8(); 2774 ThrowVerifyError(klass.Get(), "Rejecting class %s because it failed compile-time verification", 2775 PrettyDescriptor(klass.Get()).c_str()); 2776 klass->SetStatus(mirror::Class::kStatusError, self); 2777 return; 2778 } 2779 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure; 2780 std::string error_msg; 2781 if (!preverified) { 2782 verifier_failure = verifier::MethodVerifier::VerifyClass(klass.Get(), 2783 Runtime::Current()->IsCompiler(), 2784 &error_msg); 2785 } 2786 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) { 2787 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) { 2788 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get()) 2789 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2790 << " because: " << error_msg; 2791 } 2792 self->AssertNoPendingException(); 2793 // Make sure all classes referenced by catch blocks are resolved. 2794 ResolveClassExceptionHandlerTypes(dex_file, klass); 2795 if (verifier_failure == verifier::MethodVerifier::kNoFailure) { 2796 // Even though there were no verifier failures we need to respect whether the super-class 2797 // was verified or requiring runtime reverification. 2798 if (super.Get() == NULL || super->IsVerified()) { 2799 klass->SetStatus(mirror::Class::kStatusVerified, self); 2800 } else { 2801 CHECK_EQ(super->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 2802 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2803 // Pretend a soft failure occured so that we don't consider the class verified below. 2804 verifier_failure = verifier::MethodVerifier::kSoftFailure; 2805 } 2806 } else { 2807 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure); 2808 // Soft failures at compile time should be retried at runtime. Soft 2809 // failures at runtime will be handled by slow paths in the generated 2810 // code. Set status accordingly. 2811 if (Runtime::Current()->IsCompiler()) { 2812 klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self); 2813 } else { 2814 klass->SetStatus(mirror::Class::kStatusVerified, self); 2815 } 2816 } 2817 } else { 2818 LOG(ERROR) << "Verification failed on class " << PrettyDescriptor(klass.Get()) 2819 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8() 2820 << " because: " << error_msg; 2821 self->AssertNoPendingException(); 2822 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str()); 2823 klass->SetStatus(mirror::Class::kStatusError, self); 2824 } 2825 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) { 2826 // Class is verified so we don't need to do any access check on its methods. 2827 // Let the interpreter know it by setting the kAccPreverified flag onto each 2828 // method. 2829 // Note: we're going here during compilation and at runtime. When we set the 2830 // kAccPreverified flag when compiling image classes, the flag is recorded 2831 // in the image and is set when loading the image. 2832 klass->SetPreverifiedFlagOnAllMethods(); 2833 } 2834} 2835 2836bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass, 2837 mirror::Class::Status& oat_file_class_status) { 2838 // If we're compiling, we can only verify the class using the oat file if 2839 // we are not compiling the image or if the class we're verifying is not part of 2840 // the app. In other words, we will only check for preverification of bootclasspath 2841 // classes. 2842 if (Runtime::Current()->IsCompiler()) { 2843 // Are we compiling the bootclasspath? 2844 if (!Runtime::Current()->UseCompileTimeClassPath()) { 2845 return false; 2846 } 2847 // We are compiling an app (not the image). 2848 2849 // Is this an app class? (I.e. not a bootclasspath class) 2850 if (klass->GetClassLoader() != NULL) { 2851 return false; 2852 } 2853 } 2854 2855 const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file); 2856 // Make this work with gtests, which do not set up the image properly. 2857 // TODO: we should clean up gtests to set up the image path properly. 2858 if (Runtime::Current()->IsCompiler() && (oat_file == NULL)) { 2859 return false; 2860 } 2861 2862 CHECK(oat_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2863 uint dex_location_checksum = dex_file.GetLocationChecksum(); 2864 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation().c_str(), 2865 &dex_location_checksum); 2866 CHECK(oat_dex_file != NULL) << dex_file.GetLocation() << " " << PrettyClass(klass); 2867 uint16_t class_def_index = klass->GetDexClassDefIndex(); 2868 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus(); 2869 if (oat_file_class_status == mirror::Class::kStatusVerified || 2870 oat_file_class_status == mirror::Class::kStatusInitialized) { 2871 return true; 2872 } 2873 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) { 2874 // Compile time verification failed with a soft error. Compile time verification can fail 2875 // because we have incomplete type information. Consider the following: 2876 // class ... { 2877 // Foo x; 2878 // .... () { 2879 // if (...) { 2880 // v1 gets assigned a type of resolved class Foo 2881 // } else { 2882 // v1 gets assigned a type of unresolved class Bar 2883 // } 2884 // iput x = v1 2885 // } } 2886 // when we merge v1 following the if-the-else it results in Conflict 2887 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be 2888 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as 2889 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk 2890 // at compile time). 2891 return false; 2892 } 2893 if (oat_file_class_status == mirror::Class::kStatusError) { 2894 // Compile time verification failed with a hard error. This is caused by invalid instructions 2895 // in the class. These errors are unrecoverable. 2896 return false; 2897 } 2898 if (oat_file_class_status == mirror::Class::kStatusNotReady) { 2899 // Status is uninitialized if we couldn't determine the status at compile time, for example, 2900 // not loading the class. 2901 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy 2902 // isn't a problem and this case shouldn't occur 2903 return false; 2904 } 2905 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status 2906 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " " 2907 << klass->GetDescriptor(); 2908 2909 return false; 2910} 2911 2912void ClassLinker::ResolveClassExceptionHandlerTypes(const DexFile& dex_file, 2913 Handle<mirror::Class> klass) { 2914 for (size_t i = 0; i < klass->NumDirectMethods(); i++) { 2915 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetDirectMethod(i)); 2916 } 2917 for (size_t i = 0; i < klass->NumVirtualMethods(); i++) { 2918 ResolveMethodExceptionHandlerTypes(dex_file, klass->GetVirtualMethod(i)); 2919 } 2920} 2921 2922void ClassLinker::ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, 2923 mirror::ArtMethod* method) { 2924 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod. 2925 const DexFile::CodeItem* code_item = dex_file.GetCodeItem(method->GetCodeItemOffset()); 2926 if (code_item == NULL) { 2927 return; // native or abstract method 2928 } 2929 if (code_item->tries_size_ == 0) { 2930 return; // nothing to process 2931 } 2932 const byte* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0); 2933 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr); 2934 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 2935 for (uint32_t idx = 0; idx < handlers_size; idx++) { 2936 CatchHandlerIterator iterator(handlers_ptr); 2937 for (; iterator.HasNext(); iterator.Next()) { 2938 // Ensure exception types are resolved so that they don't need resolution to be delivered, 2939 // unresolved exception types will be ignored by exception delivery 2940 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) { 2941 mirror::Class* exception_type = linker->ResolveType(iterator.GetHandlerTypeIndex(), method); 2942 if (exception_type == NULL) { 2943 DCHECK(Thread::Current()->IsExceptionPending()); 2944 Thread::Current()->ClearException(); 2945 } 2946 } 2947 } 2948 handlers_ptr = iterator.EndDataPointer(); 2949 } 2950} 2951 2952static void CheckProxyConstructor(mirror::ArtMethod* constructor); 2953static void CheckProxyMethod(Handle<mirror::ArtMethod> method, 2954 Handle<mirror::ArtMethod> prototype); 2955 2956mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name, 2957 jobjectArray interfaces, jobject loader, 2958 jobjectArray methods, jobjectArray throws) { 2959 Thread* self = soa.Self(); 2960 StackHandleScope<8> hs(self); 2961 Handle<mirror::Class> klass(hs.NewHandle(AllocClass(self, GetClassRoot(kJavaLangClass), 2962 sizeof(mirror::SynthesizedProxyClass)))); 2963 if (klass.Get() == NULL) { 2964 CHECK(self->IsExceptionPending()); // OOME. 2965 return NULL; 2966 } 2967 DCHECK(klass->GetClass() != NULL); 2968 klass->SetObjectSize(sizeof(mirror::Proxy)); 2969 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal); 2970 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader)); 2971 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot); 2972 klass->SetName(soa.Decode<mirror::String*>(name)); 2973 mirror::Class* proxy_class = GetClassRoot(kJavaLangReflectProxy); 2974 klass->SetDexCache(proxy_class->GetDexCache()); 2975 klass->SetStatus(mirror::Class::kStatusIdx, self); 2976 2977 // Instance fields are inherited, but we add a couple of static fields... 2978 { 2979 mirror::ObjectArray<mirror::ArtField>* sfields = AllocArtFieldArray(self, 2); 2980 if (UNLIKELY(sfields == NULL)) { 2981 CHECK(self->IsExceptionPending()); // OOME. 2982 return NULL; 2983 } 2984 klass->SetSFields(sfields); 2985 } 2986 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by 2987 // our proxy, so Class.getInterfaces doesn't return the flattened set. 2988 Handle<mirror::ArtField> interfaces_sfield(hs.NewHandle(AllocArtField(self))); 2989 if (UNLIKELY(interfaces_sfield.Get() == nullptr)) { 2990 CHECK(self->IsExceptionPending()); // OOME. 2991 return nullptr; 2992 } 2993 klass->SetStaticField(0, interfaces_sfield.Get()); 2994 interfaces_sfield->SetDexFieldIndex(0); 2995 interfaces_sfield->SetDeclaringClass(klass.Get()); 2996 interfaces_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 2997 // 2. Create a static field 'throws' that holds exceptions thrown by our methods. 2998 Handle<mirror::ArtField> throws_sfield(hs.NewHandle(AllocArtField(self))); 2999 if (UNLIKELY(throws_sfield.Get() == nullptr)) { 3000 CHECK(self->IsExceptionPending()); // OOME. 3001 return nullptr; 3002 } 3003 klass->SetStaticField(1, throws_sfield.Get()); 3004 throws_sfield->SetDexFieldIndex(1); 3005 throws_sfield->SetDeclaringClass(klass.Get()); 3006 throws_sfield->SetAccessFlags(kAccStatic | kAccPublic | kAccFinal); 3007 3008 // Proxies have 1 direct method, the constructor 3009 { 3010 mirror::ObjectArray<mirror::ArtMethod>* directs = AllocArtMethodArray(self, 1); 3011 if (UNLIKELY(directs == nullptr)) { 3012 CHECK(self->IsExceptionPending()); // OOME. 3013 return nullptr; 3014 } 3015 klass->SetDirectMethods(directs); 3016 mirror::ArtMethod* constructor = CreateProxyConstructor(self, klass, proxy_class); 3017 if (UNLIKELY(constructor == nullptr)) { 3018 CHECK(self->IsExceptionPending()); // OOME. 3019 return nullptr; 3020 } 3021 klass->SetDirectMethod(0, constructor); 3022 } 3023 3024 // Create virtual method using specified prototypes. 3025 size_t num_virtual_methods = 3026 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods)->GetLength(); 3027 { 3028 mirror::ObjectArray<mirror::ArtMethod>* virtuals = AllocArtMethodArray(self, 3029 num_virtual_methods); 3030 if (UNLIKELY(virtuals == NULL)) { 3031 CHECK(self->IsExceptionPending()); // OOME. 3032 return NULL; 3033 } 3034 klass->SetVirtualMethods(virtuals); 3035 } 3036 for (size_t i = 0; i < num_virtual_methods; ++i) { 3037 StackHandleScope<1> hs(self); 3038 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3039 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3040 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3041 mirror::ArtMethod* clone = CreateProxyMethod(self, klass, prototype); 3042 if (UNLIKELY(clone == nullptr)) { 3043 CHECK(self->IsExceptionPending()); // OOME. 3044 return nullptr; 3045 } 3046 klass->SetVirtualMethod(i, clone); 3047 } 3048 3049 klass->SetSuperClass(proxy_class); // The super class is java.lang.reflect.Proxy 3050 klass->SetStatus(mirror::Class::kStatusLoaded, self); // Now effectively in the loaded state. 3051 self->AssertNoPendingException(); 3052 3053 { 3054 ObjectLock<mirror::Class> lock(self, klass); // Must hold lock on object when resolved. 3055 // Link the fields and virtual methods, creating vtable and iftables 3056 Handle<mirror::ObjectArray<mirror::Class>> h_interfaces( 3057 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces))); 3058 if (!LinkClass(self, klass, h_interfaces)) { 3059 klass->SetStatus(mirror::Class::kStatusError, self); 3060 return nullptr; 3061 } 3062 3063 interfaces_sfield->SetObject<false>( 3064 klass.Get(), soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3065 throws_sfield->SetObject<false>( 3066 klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3067 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3068 } 3069 3070 // sanity checks 3071 if (kIsDebugBuild) { 3072 CHECK(klass->GetIFields() == nullptr); 3073 CheckProxyConstructor(klass->GetDirectMethod(0)); 3074 for (size_t i = 0; i < num_virtual_methods; ++i) { 3075 StackHandleScope<2> hs(self); 3076 mirror::ObjectArray<mirror::ArtMethod>* decoded_methods = 3077 soa.Decode<mirror::ObjectArray<mirror::ArtMethod>*>(methods); 3078 Handle<mirror::ArtMethod> prototype(hs.NewHandle(decoded_methods->Get(i))); 3079 Handle<mirror::ArtMethod> virtual_method(hs.NewHandle(klass->GetVirtualMethod(i))); 3080 CheckProxyMethod(virtual_method, prototype); 3081 } 3082 3083 mirror::String* decoded_name = soa.Decode<mirror::String*>(name); 3084 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces", 3085 decoded_name->ToModifiedUtf8().c_str())); 3086 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name); 3087 3088 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws", 3089 decoded_name->ToModifiedUtf8().c_str())); 3090 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name); 3091 3092 mirror::SynthesizedProxyClass* synth_proxy_class = 3093 down_cast<mirror::SynthesizedProxyClass*>(klass.Get()); 3094 CHECK_EQ(synth_proxy_class->GetInterfaces(), 3095 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)); 3096 CHECK_EQ(synth_proxy_class->GetThrows(), 3097 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws)); 3098 } 3099 std::string descriptor(GetDescriptorForProxy(klass.Get())); 3100 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), Hash(descriptor.c_str())); 3101 CHECK(existing == nullptr); 3102 return klass.Get(); 3103} 3104 3105std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) { 3106 DCHECK(proxy_class->IsProxyClass()); 3107 mirror::String* name = proxy_class->GetName(); 3108 DCHECK(name != NULL); 3109 return DotToDescriptor(name->ToModifiedUtf8().c_str()); 3110} 3111 3112mirror::ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, 3113 mirror::ArtMethod* proxy_method) { 3114 DCHECK(proxy_class->IsProxyClass()); 3115 DCHECK(proxy_method->IsProxyMethod()); 3116 // Locate the dex cache of the original interface/Object 3117 mirror::DexCache* dex_cache = NULL; 3118 { 3119 mirror::ObjectArray<mirror::Class>* resolved_types = proxy_method->GetDexCacheResolvedTypes(); 3120 ReaderMutexLock mu(Thread::Current(), dex_lock_); 3121 for (size_t i = 0; i != dex_caches_.size(); ++i) { 3122 mirror::DexCache* a_dex_cache = GetDexCache(i); 3123 if (a_dex_cache->GetResolvedTypes() == resolved_types) { 3124 dex_cache = a_dex_cache; 3125 break; 3126 } 3127 } 3128 } 3129 CHECK(dex_cache != NULL); 3130 uint32_t method_idx = proxy_method->GetDexMethodIndex(); 3131 mirror::ArtMethod* resolved_method = dex_cache->GetResolvedMethod(method_idx); 3132 CHECK(resolved_method != NULL); 3133 return resolved_method; 3134} 3135 3136 3137mirror::ArtMethod* ClassLinker::CreateProxyConstructor(Thread* self, 3138 Handle<mirror::Class> klass, 3139 mirror::Class* proxy_class) { 3140 // Create constructor for Proxy that must initialize h 3141 mirror::ObjectArray<mirror::ArtMethod>* proxy_direct_methods = 3142 proxy_class->GetDirectMethods(); 3143 CHECK_EQ(proxy_direct_methods->GetLength(), 16); 3144 mirror::ArtMethod* proxy_constructor = proxy_direct_methods->Get(2); 3145 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its 3146 // code_ too) 3147 mirror::ArtMethod* constructor = 3148 down_cast<mirror::ArtMethod*>(proxy_constructor->Clone(self)); 3149 if (constructor == NULL) { 3150 CHECK(self->IsExceptionPending()); // OOME. 3151 return NULL; 3152 } 3153 // Make this constructor public and fix the class to be our Proxy version 3154 constructor->SetAccessFlags((constructor->GetAccessFlags() & ~kAccProtected) | kAccPublic); 3155 constructor->SetDeclaringClass(klass.Get()); 3156 return constructor; 3157} 3158 3159static void CheckProxyConstructor(mirror::ArtMethod* constructor) 3160 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3161 CHECK(constructor->IsConstructor()); 3162 CHECK_STREQ(constructor->GetName(), "<init>"); 3163 CHECK_STREQ(constructor->GetSignature().ToString().c_str(), 3164 "(Ljava/lang/reflect/InvocationHandler;)V"); 3165 DCHECK(constructor->IsPublic()); 3166} 3167 3168mirror::ArtMethod* ClassLinker::CreateProxyMethod(Thread* self, 3169 Handle<mirror::Class> klass, 3170 Handle<mirror::ArtMethod> prototype) { 3171 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden 3172 // prototype method 3173 prototype->GetDeclaringClass()->GetDexCache()->SetResolvedMethod(prototype->GetDexMethodIndex(), 3174 prototype.Get()); 3175 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize 3176 // as necessary 3177 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(prototype->Clone(self)); 3178 if (UNLIKELY(method == NULL)) { 3179 CHECK(self->IsExceptionPending()); // OOME. 3180 return NULL; 3181 } 3182 3183 // Set class to be the concrete proxy class and clear the abstract flag, modify exceptions to 3184 // the intersection of throw exceptions as defined in Proxy 3185 method->SetDeclaringClass(klass.Get()); 3186 method->SetAccessFlags((method->GetAccessFlags() & ~kAccAbstract) | kAccFinal); 3187 3188 // At runtime the method looks like a reference and argument saving method, clone the code 3189 // related parameters from this method. 3190 method->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler()); 3191 method->SetEntryPointFromPortableCompiledCode(GetPortableProxyInvokeHandler()); 3192 method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge); 3193 3194 return method; 3195} 3196 3197static void CheckProxyMethod(Handle<mirror::ArtMethod> method, Handle<mirror::ArtMethod> prototype) 3198 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3199 // Basic sanity 3200 CHECK(!prototype->IsFinal()); 3201 CHECK(method->IsFinal()); 3202 CHECK(!method->IsAbstract()); 3203 3204 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its 3205 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself. 3206 CHECK_EQ(prototype->GetDexCacheStrings(), method->GetDexCacheStrings()); 3207 CHECK_EQ(prototype->GetDexCacheResolvedMethods(), method->GetDexCacheResolvedMethods()); 3208 CHECK_EQ(prototype->GetDexCacheResolvedTypes(), method->GetDexCacheResolvedTypes()); 3209 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex()); 3210 3211 MethodHelper mh(method); 3212 MethodHelper mh2(prototype); 3213 CHECK_STREQ(method->GetName(), prototype->GetName()); 3214 CHECK_STREQ(method->GetShorty(), prototype->GetShorty()); 3215 // More complex sanity - via dex cache 3216 CHECK_EQ(mh.GetReturnType(), mh2.GetReturnType()); 3217} 3218 3219static bool CanWeInitializeClass(mirror::Class* klass, bool can_init_statics, 3220 bool can_init_parents) 3221 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3222 if (can_init_statics && can_init_parents) { 3223 return true; 3224 } 3225 if (!can_init_statics) { 3226 // Check if there's a class initializer. 3227 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3228 if (clinit != NULL) { 3229 return false; 3230 } 3231 // Check if there are encoded static values needing initialization. 3232 if (klass->NumStaticFields() != 0) { 3233 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3234 DCHECK(dex_class_def != NULL); 3235 if (dex_class_def->static_values_off_ != 0) { 3236 return false; 3237 } 3238 } 3239 } 3240 if (!klass->IsInterface() && klass->HasSuperClass()) { 3241 mirror::Class* super_class = klass->GetSuperClass(); 3242 if (!can_init_parents && !super_class->IsInitialized()) { 3243 return false; 3244 } else { 3245 if (!CanWeInitializeClass(super_class, can_init_statics, can_init_parents)) { 3246 return false; 3247 } 3248 } 3249 } 3250 return true; 3251} 3252 3253bool ClassLinker::IsInitialized() const { 3254 return init_done_; 3255} 3256 3257bool ClassLinker::InitializeClass(Handle<mirror::Class> klass, bool can_init_statics, 3258 bool can_init_parents) { 3259 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol 3260 3261 // Are we already initialized and therefore done? 3262 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as 3263 // an initialized class will never change its state. 3264 if (klass->IsInitialized()) { 3265 return true; 3266 } 3267 3268 // Fast fail if initialization requires a full runtime. Not part of the JLS. 3269 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) { 3270 return false; 3271 } 3272 3273 Thread* self = Thread::Current(); 3274 uint64_t t0; 3275 { 3276 ObjectLock<mirror::Class> lock(self, klass); 3277 3278 // Re-check under the lock in case another thread initialized ahead of us. 3279 if (klass->IsInitialized()) { 3280 return true; 3281 } 3282 3283 // Was the class already found to be erroneous? Done under the lock to match the JLS. 3284 if (klass->IsErroneous()) { 3285 ThrowEarlierClassFailure(klass.Get()); 3286 return false; 3287 } 3288 3289 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus(); 3290 3291 if (!klass->IsVerified()) { 3292 VerifyClass(klass); 3293 if (!klass->IsVerified()) { 3294 // We failed to verify, expect either the klass to be erroneous or verification failed at 3295 // compile time. 3296 if (klass->IsErroneous()) { 3297 CHECK(self->IsExceptionPending()); 3298 } else { 3299 CHECK(Runtime::Current()->IsCompiler()); 3300 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime); 3301 } 3302 return false; 3303 } 3304 } 3305 3306 // If the class is kStatusInitializing, either this thread is 3307 // initializing higher up the stack or another thread has beat us 3308 // to initializing and we need to wait. Either way, this 3309 // invocation of InitializeClass will not be responsible for 3310 // running <clinit> and will return. 3311 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3312 // We caught somebody else in the act; was it us? 3313 if (klass->GetClinitThreadId() == self->GetTid()) { 3314 // Yes. That's fine. Return so we can continue initializing. 3315 return true; 3316 } 3317 // No. That's fine. Wait for another thread to finish initializing. 3318 return WaitForInitializeClass(klass, self, lock); 3319 } 3320 3321 if (!ValidateSuperClassDescriptors(klass)) { 3322 klass->SetStatus(mirror::Class::kStatusError, self); 3323 return false; 3324 } 3325 3326 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get()); 3327 3328 // From here out other threads may observe that we're initializing and so changes of state 3329 // require the a notification. 3330 klass->SetClinitThreadId(self->GetTid()); 3331 klass->SetStatus(mirror::Class::kStatusInitializing, self); 3332 3333 t0 = NanoTime(); 3334 } 3335 3336 // Initialize super classes, must be done while initializing for the JLS. 3337 if (!klass->IsInterface() && klass->HasSuperClass()) { 3338 mirror::Class* super_class = klass->GetSuperClass(); 3339 if (!super_class->IsInitialized()) { 3340 CHECK(!super_class->IsInterface()); 3341 CHECK(can_init_parents); 3342 StackHandleScope<1> hs(self); 3343 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class)); 3344 bool super_initialized = InitializeClass(handle_scope_super, can_init_statics, true); 3345 if (!super_initialized) { 3346 // The super class was verified ahead of entering initializing, we should only be here if 3347 // the super class became erroneous due to initialization. 3348 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending()) 3349 << "Super class initialization failed for " 3350 << PrettyDescriptor(handle_scope_super.Get()) 3351 << " that has unexpected status " << handle_scope_super->GetStatus() 3352 << "\nPending exception:\n" 3353 << (self->GetException(NULL) != NULL ? self->GetException(NULL)->Dump() : ""); 3354 ObjectLock<mirror::Class> lock(self, klass); 3355 // Initialization failed because the super-class is erroneous. 3356 klass->SetStatus(mirror::Class::kStatusError, self); 3357 return false; 3358 } 3359 } 3360 } 3361 3362 if (klass->NumStaticFields() > 0) { 3363 const DexFile::ClassDef* dex_class_def = klass->GetClassDef(); 3364 CHECK(dex_class_def != NULL); 3365 const DexFile& dex_file = klass->GetDexFile(); 3366 StackHandleScope<2> hs(self); 3367 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader())); 3368 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache())); 3369 EncodedStaticFieldValueIterator it(dex_file, &dex_cache, &class_loader, 3370 this, *dex_class_def); 3371 if (it.HasNext()) { 3372 CHECK(can_init_statics); 3373 // We reordered the fields, so we need to be able to map the 3374 // field indexes to the right fields. 3375 SafeMap<uint32_t, mirror::ArtField*> field_map; 3376 ConstructFieldMap(dex_file, *dex_class_def, klass.Get(), field_map); 3377 for (size_t i = 0; it.HasNext(); i++, it.Next()) { 3378 if (Runtime::Current()->IsActiveTransaction()) { 3379 it.ReadValueToField<true>(field_map.Get(i)); 3380 } else { 3381 it.ReadValueToField<false>(field_map.Get(i)); 3382 } 3383 } 3384 } 3385 } 3386 3387 mirror::ArtMethod* clinit = klass->FindClassInitializer(); 3388 if (clinit != NULL) { 3389 CHECK(can_init_statics); 3390 JValue result; 3391 clinit->Invoke(self, NULL, 0, &result, "V"); 3392 } 3393 3394 uint64_t t1 = NanoTime(); 3395 3396 bool success = true; 3397 { 3398 ObjectLock<mirror::Class> lock(self, klass); 3399 3400 if (self->IsExceptionPending()) { 3401 WrapExceptionInInitializer(); 3402 klass->SetStatus(mirror::Class::kStatusError, self); 3403 success = false; 3404 } else { 3405 RuntimeStats* global_stats = Runtime::Current()->GetStats(); 3406 RuntimeStats* thread_stats = self->GetStats(); 3407 ++global_stats->class_init_count; 3408 ++thread_stats->class_init_count; 3409 global_stats->class_init_time_ns += (t1 - t0); 3410 thread_stats->class_init_time_ns += (t1 - t0); 3411 // Set the class as initialized except if failed to initialize static fields. 3412 klass->SetStatus(mirror::Class::kStatusInitialized, self); 3413 if (VLOG_IS_ON(class_linker)) { 3414 LOG(INFO) << "Initialized class " << klass->GetDescriptor() << " from " << 3415 klass->GetLocation(); 3416 } 3417 // Opportunistically set static method trampolines to their destination. 3418 FixupStaticTrampolines(klass.Get()); 3419 } 3420 } 3421 return success; 3422} 3423 3424bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self, 3425 ObjectLock<mirror::Class>& lock) 3426 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3427 while (true) { 3428 self->AssertNoPendingException(); 3429 CHECK(!klass->IsInitialized()); 3430 lock.WaitIgnoringInterrupts(); 3431 3432 // When we wake up, repeat the test for init-in-progress. If 3433 // there's an exception pending (only possible if 3434 // "interruptShouldThrow" was set), bail out. 3435 if (self->IsExceptionPending()) { 3436 WrapExceptionInInitializer(); 3437 klass->SetStatus(mirror::Class::kStatusError, self); 3438 return false; 3439 } 3440 // Spurious wakeup? Go back to waiting. 3441 if (klass->GetStatus() == mirror::Class::kStatusInitializing) { 3442 continue; 3443 } 3444 if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) { 3445 // Compile time initialization failed. 3446 return false; 3447 } 3448 if (klass->IsErroneous()) { 3449 // The caller wants an exception, but it was thrown in a 3450 // different thread. Synthesize one here. 3451 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread", 3452 PrettyDescriptor(klass.Get()).c_str()); 3453 return false; 3454 } 3455 if (klass->IsInitialized()) { 3456 return true; 3457 } 3458 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is " 3459 << klass->GetStatus(); 3460 } 3461 LOG(FATAL) << "Not Reached" << PrettyClass(klass.Get()); 3462} 3463 3464bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) { 3465 if (klass->IsInterface()) { 3466 return true; 3467 } 3468 // Begin with the methods local to the superclass. 3469 StackHandleScope<2> hs(Thread::Current()); 3470 MethodHelper mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3471 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3472 if (klass->HasSuperClass() && 3473 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { 3474 for (int i = klass->GetSuperClass()->GetVTable()->GetLength() - 1; i >= 0; --i) { 3475 mh.ChangeMethod(klass->GetVTable()->GetWithoutChecks(i)); 3476 super_mh.ChangeMethod(klass->GetSuperClass()->GetVTable()->GetWithoutChecks(i)); 3477 if (mh.GetMethod() != super_mh.GetMethod() && 3478 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3479 ThrowLinkageError(klass.Get(), 3480 "Class %s method %s resolves differently in superclass %s", 3481 PrettyDescriptor(klass.Get()).c_str(), 3482 PrettyMethod(mh.GetMethod()).c_str(), 3483 PrettyDescriptor(klass->GetSuperClass()).c_str()); 3484 return false; 3485 } 3486 } 3487 } 3488 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) { 3489 if (klass->GetClassLoader() != klass->GetIfTable()->GetInterface(i)->GetClassLoader()) { 3490 uint32_t num_methods = klass->GetIfTable()->GetInterface(i)->NumVirtualMethods(); 3491 for (uint32_t j = 0; j < num_methods; ++j) { 3492 mh.ChangeMethod(klass->GetIfTable()->GetMethodArray(i)->GetWithoutChecks(j)); 3493 super_mh.ChangeMethod(klass->GetIfTable()->GetInterface(i)->GetVirtualMethod(j)); 3494 if (mh.GetMethod() != super_mh.GetMethod() && 3495 !mh.HasSameSignatureWithDifferentClassLoaders(&super_mh)) { 3496 ThrowLinkageError(klass.Get(), 3497 "Class %s method %s resolves differently in interface %s", 3498 PrettyDescriptor(klass.Get()).c_str(), 3499 PrettyMethod(mh.GetMethod()).c_str(), 3500 PrettyDescriptor(klass->GetIfTable()->GetInterface(i)).c_str()); 3501 return false; 3502 } 3503 } 3504 } 3505 } 3506 return true; 3507} 3508 3509bool ClassLinker::EnsureInitialized(Handle<mirror::Class> c, bool can_init_fields, 3510 bool can_init_parents) { 3511 DCHECK(c.Get() != nullptr); 3512 const bool success = c->IsInitialized() || InitializeClass(c, can_init_fields, can_init_parents); 3513 if (!success && can_init_fields && can_init_parents) { 3514 CHECK(Thread::Current()->IsExceptionPending()) << PrettyClass(c.Get()); 3515 } 3516 return success; 3517} 3518 3519void ClassLinker::ConstructFieldMap(const DexFile& dex_file, const DexFile::ClassDef& dex_class_def, 3520 mirror::Class* c, 3521 SafeMap<uint32_t, mirror::ArtField*>& field_map) { 3522 const byte* class_data = dex_file.GetClassData(dex_class_def); 3523 ClassDataItemIterator it(dex_file, class_data); 3524 StackHandleScope<2> hs(Thread::Current()); 3525 Handle<mirror::DexCache> dex_cache(hs.NewHandle(c->GetDexCache())); 3526 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(c->GetClassLoader())); 3527 CHECK(!kMovingFields); 3528 for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) { 3529 field_map.Put(i, ResolveField(dex_file, it.GetMemberIndex(), dex_cache, class_loader, true)); 3530 } 3531} 3532 3533bool ClassLinker::LinkClass(Thread* self, Handle<mirror::Class> klass, 3534 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3535 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3536 if (!LinkSuperClass(klass)) { 3537 return false; 3538 } 3539 if (!LinkMethods(self, klass, interfaces)) { 3540 return false; 3541 } 3542 if (!LinkInstanceFields(klass)) { 3543 return false; 3544 } 3545 if (!LinkStaticFields(klass)) { 3546 return false; 3547 } 3548 CreateReferenceInstanceOffsets(klass); 3549 CreateReferenceStaticOffsets(klass); 3550 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus()); 3551 klass->SetStatus(mirror::Class::kStatusResolved, self); 3552 return true; 3553} 3554 3555bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) { 3556 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus()); 3557 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex()); 3558 uint16_t super_class_idx = class_def.superclass_idx_; 3559 if (super_class_idx != DexFile::kDexNoIndex16) { 3560 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get()); 3561 if (super_class == NULL) { 3562 DCHECK(Thread::Current()->IsExceptionPending()); 3563 return false; 3564 } 3565 // Verify 3566 if (!klass->CanAccess(super_class)) { 3567 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible", 3568 PrettyDescriptor(super_class).c_str(), 3569 PrettyDescriptor(klass.Get()).c_str()); 3570 return false; 3571 } 3572 klass->SetSuperClass(super_class); 3573 } 3574 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def); 3575 if (interfaces != NULL) { 3576 for (size_t i = 0; i < interfaces->Size(); i++) { 3577 uint16_t idx = interfaces->GetTypeItem(i).type_idx_; 3578 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get()); 3579 if (interface == NULL) { 3580 DCHECK(Thread::Current()->IsExceptionPending()); 3581 return false; 3582 } 3583 // Verify 3584 if (!klass->CanAccess(interface)) { 3585 // TODO: the RI seemed to ignore this in my testing. 3586 ThrowIllegalAccessError(klass.Get(), "Interface %s implemented by class %s is inaccessible", 3587 PrettyDescriptor(interface).c_str(), 3588 PrettyDescriptor(klass.Get()).c_str()); 3589 return false; 3590 } 3591 } 3592 } 3593 // Mark the class as loaded. 3594 klass->SetStatus(mirror::Class::kStatusLoaded, NULL); 3595 return true; 3596} 3597 3598bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) { 3599 CHECK(!klass->IsPrimitive()); 3600 mirror::Class* super = klass->GetSuperClass(); 3601 if (klass.Get() == GetClassRoot(kJavaLangObject)) { 3602 if (super != NULL) { 3603 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass"); 3604 return false; 3605 } 3606 return true; 3607 } 3608 if (super == NULL) { 3609 ThrowLinkageError(klass.Get(), "No superclass defined for class %s", 3610 PrettyDescriptor(klass.Get()).c_str()); 3611 return false; 3612 } 3613 // Verify 3614 if (super->IsFinal() || super->IsInterface()) { 3615 ThrowIncompatibleClassChangeError(klass.Get(), "Superclass %s of %s is %s", 3616 PrettyDescriptor(super).c_str(), 3617 PrettyDescriptor(klass.Get()).c_str(), 3618 super->IsFinal() ? "declared final" : "an interface"); 3619 return false; 3620 } 3621 if (!klass->CanAccess(super)) { 3622 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s", 3623 PrettyDescriptor(super).c_str(), 3624 PrettyDescriptor(klass.Get()).c_str()); 3625 return false; 3626 } 3627 3628 // Inherit kAccClassIsFinalizable from the superclass in case this 3629 // class doesn't override finalize. 3630 if (super->IsFinalizable()) { 3631 klass->SetFinalizable(); 3632 } 3633 3634 // Inherit reference flags (if any) from the superclass. 3635 int reference_flags = (super->GetAccessFlags() & kAccReferenceFlagsMask); 3636 if (reference_flags != 0) { 3637 klass->SetAccessFlags(klass->GetAccessFlags() | reference_flags); 3638 } 3639 // Disallow custom direct subclasses of java.lang.ref.Reference. 3640 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) { 3641 ThrowLinkageError(klass.Get(), 3642 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed", 3643 PrettyDescriptor(klass.Get()).c_str()); 3644 return false; 3645 } 3646 3647 if (kIsDebugBuild) { 3648 // Ensure super classes are fully resolved prior to resolving fields.. 3649 while (super != NULL) { 3650 CHECK(super->IsResolved()); 3651 super = super->GetSuperClass(); 3652 } 3653 } 3654 return true; 3655} 3656 3657// Populate the class vtable and itable. Compute return type indices. 3658bool ClassLinker::LinkMethods(Thread* self, Handle<mirror::Class> klass, 3659 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3660 if (klass->IsInterface()) { 3661 // No vtable. 3662 size_t count = klass->NumVirtualMethods(); 3663 if (!IsUint(16, count)) { 3664 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zd", count); 3665 return false; 3666 } 3667 for (size_t i = 0; i < count; ++i) { 3668 klass->GetVirtualMethodDuringLinking(i)->SetMethodIndex(i); 3669 } 3670 // Link interface method tables 3671 return LinkInterfaceMethods(klass, interfaces); 3672 } else { 3673 // Link virtual and interface method tables 3674 return LinkVirtualMethods(self, klass) && LinkInterfaceMethods(klass, interfaces); 3675 } 3676 return true; 3677} 3678 3679bool ClassLinker::LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass) { 3680 if (klass->HasSuperClass()) { 3681 uint32_t max_count = klass->NumVirtualMethods() + 3682 klass->GetSuperClass()->GetVTable()->GetLength(); 3683 size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength(); 3684 CHECK_LE(actual_count, max_count); 3685 // TODO: do not assign to the vtable field until it is fully constructed. 3686 StackHandleScope<3> hs(self); 3687 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3688 hs.NewHandle(klass->GetSuperClass()->GetVTable()->CopyOf(self, max_count))); 3689 if (UNLIKELY(vtable.Get() == NULL)) { 3690 CHECK(self->IsExceptionPending()); // OOME. 3691 return false; 3692 } 3693 // See if any of our virtual methods override the superclass. 3694 MethodHelper local_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3695 MethodHelper super_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3696 for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { 3697 mirror::ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i); 3698 local_mh.ChangeMethod(local_method); 3699 size_t j = 0; 3700 for (; j < actual_count; ++j) { 3701 mirror::ArtMethod* super_method = vtable->Get(j); 3702 super_mh.ChangeMethod(super_method); 3703 if (local_mh.HasSameNameAndSignature(&super_mh)) { 3704 if (klass->CanAccessMember(super_method->GetDeclaringClass(), 3705 super_method->GetAccessFlags())) { 3706 if (super_method->IsFinal()) { 3707 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s", 3708 PrettyMethod(local_method).c_str(), 3709 super_method->GetDeclaringClassDescriptor()); 3710 return false; 3711 } 3712 vtable->Set<false>(j, local_method); 3713 local_method->SetMethodIndex(j); 3714 break; 3715 } else { 3716 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(local_method) 3717 << " would have incorrectly overridden the package-private method in " 3718 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor()); 3719 } 3720 } 3721 } 3722 if (j == actual_count) { 3723 // Not overriding, append. 3724 vtable->Set<false>(actual_count, local_method); 3725 local_method->SetMethodIndex(actual_count); 3726 actual_count += 1; 3727 } 3728 } 3729 if (!IsUint(16, actual_count)) { 3730 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count); 3731 return false; 3732 } 3733 // Shrink vtable if possible 3734 CHECK_LE(actual_count, max_count); 3735 if (actual_count < max_count) { 3736 vtable.Assign(vtable->CopyOf(self, actual_count)); 3737 if (UNLIKELY(vtable.Get() == NULL)) { 3738 CHECK(self->IsExceptionPending()); // OOME. 3739 return false; 3740 } 3741 } 3742 klass->SetVTable(vtable.Get()); 3743 } else { 3744 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject)); 3745 uint32_t num_virtual_methods = klass->NumVirtualMethods(); 3746 if (!IsUint(16, num_virtual_methods)) { 3747 ThrowClassFormatError(klass.Get(), "Too many methods: %d", num_virtual_methods); 3748 return false; 3749 } 3750 StackHandleScope<1> hs(self); 3751 Handle<mirror::ObjectArray<mirror::ArtMethod>> 3752 vtable(hs.NewHandle(AllocArtMethodArray(self, num_virtual_methods))); 3753 if (UNLIKELY(vtable.Get() == NULL)) { 3754 CHECK(self->IsExceptionPending()); // OOME. 3755 return false; 3756 } 3757 for (size_t i = 0; i < num_virtual_methods; ++i) { 3758 mirror::ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i); 3759 vtable->Set<false>(i, virtual_method); 3760 virtual_method->SetMethodIndex(i & 0xFFFF); 3761 } 3762 klass->SetVTable(vtable.Get()); 3763 } 3764 return true; 3765} 3766 3767bool ClassLinker::LinkInterfaceMethods(Handle<mirror::Class> klass, 3768 Handle<mirror::ObjectArray<mirror::Class>> interfaces) { 3769 Thread* const self = Thread::Current(); 3770 Runtime* const runtime = Runtime::Current(); 3771 // Set the imt table to be all conflicts by default. 3772 klass->SetImTable(runtime->GetDefaultImt()); 3773 size_t super_ifcount; 3774 if (klass->HasSuperClass()) { 3775 super_ifcount = klass->GetSuperClass()->GetIfTableCount(); 3776 } else { 3777 super_ifcount = 0; 3778 } 3779 uint32_t num_interfaces = 3780 interfaces.Get() == nullptr ? klass->NumDirectInterfaces() : interfaces->GetLength(); 3781 size_t ifcount = super_ifcount + num_interfaces; 3782 for (size_t i = 0; i < num_interfaces; i++) { 3783 mirror::Class* interface = 3784 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 3785 interfaces->Get(i); 3786 ifcount += interface->GetIfTableCount(); 3787 } 3788 if (ifcount == 0) { 3789 // Class implements no interfaces. 3790 DCHECK_EQ(klass->GetIfTableCount(), 0); 3791 DCHECK(klass->GetIfTable() == NULL); 3792 return true; 3793 } 3794 if (ifcount == super_ifcount) { 3795 // Class implements same interfaces as parent, are any of these not marker interfaces? 3796 bool has_non_marker_interface = false; 3797 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3798 for (size_t i = 0; i < ifcount; ++i) { 3799 if (super_iftable->GetMethodArrayCount(i) > 0) { 3800 has_non_marker_interface = true; 3801 break; 3802 } 3803 } 3804 if (!has_non_marker_interface) { 3805 // Class just inherits marker interfaces from parent so recycle parent's iftable. 3806 klass->SetIfTable(super_iftable); 3807 return true; 3808 } 3809 } 3810 StackHandleScope<4> hs(self); 3811 Handle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount))); 3812 if (UNLIKELY(iftable.Get() == NULL)) { 3813 CHECK(self->IsExceptionPending()); // OOME. 3814 return false; 3815 } 3816 if (super_ifcount != 0) { 3817 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable(); 3818 for (size_t i = 0; i < super_ifcount; i++) { 3819 mirror::Class* super_interface = super_iftable->GetInterface(i); 3820 iftable->SetInterface(i, super_interface); 3821 } 3822 } 3823 // Flatten the interface inheritance hierarchy. 3824 size_t idx = super_ifcount; 3825 for (size_t i = 0; i < num_interfaces; i++) { 3826 mirror::Class* interface = 3827 interfaces.Get() == nullptr ? mirror::Class::GetDirectInterface(self, klass, i) : 3828 interfaces->Get(i); 3829 DCHECK(interface != NULL); 3830 if (!interface->IsInterface()) { 3831 ThrowIncompatibleClassChangeError(klass.Get(), "Class %s implements non-interface class %s", 3832 PrettyDescriptor(klass.Get()).c_str(), 3833 PrettyDescriptor(interface->GetDescriptor()).c_str()); 3834 return false; 3835 } 3836 // Check if interface is already in iftable 3837 bool duplicate = false; 3838 for (size_t j = 0; j < idx; j++) { 3839 mirror::Class* existing_interface = iftable->GetInterface(j); 3840 if (existing_interface == interface) { 3841 duplicate = true; 3842 break; 3843 } 3844 } 3845 if (!duplicate) { 3846 // Add this non-duplicate interface. 3847 iftable->SetInterface(idx++, interface); 3848 // Add this interface's non-duplicate super-interfaces. 3849 for (int32_t j = 0; j < interface->GetIfTableCount(); j++) { 3850 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j); 3851 bool super_duplicate = false; 3852 for (size_t k = 0; k < idx; k++) { 3853 mirror::Class* existing_interface = iftable->GetInterface(k); 3854 if (existing_interface == super_interface) { 3855 super_duplicate = true; 3856 break; 3857 } 3858 } 3859 if (!super_duplicate) { 3860 iftable->SetInterface(idx++, super_interface); 3861 } 3862 } 3863 } 3864 } 3865 // Shrink iftable in case duplicates were found 3866 if (idx < ifcount) { 3867 iftable.Assign(down_cast<mirror::IfTable*>(iftable->CopyOf(self, idx * mirror::IfTable::kMax))); 3868 if (UNLIKELY(iftable.Get() == NULL)) { 3869 CHECK(self->IsExceptionPending()); // OOME. 3870 return false; 3871 } 3872 ifcount = idx; 3873 } else { 3874 CHECK_EQ(idx, ifcount); 3875 } 3876 klass->SetIfTable(iftable.Get()); 3877 3878 // If we're an interface, we don't need the vtable pointers, so we're done. 3879 if (klass->IsInterface()) { 3880 return true; 3881 } 3882 // Allocate imtable 3883 bool imtable_changed = false; 3884 Handle<mirror::ObjectArray<mirror::ArtMethod>> imtable( 3885 hs.NewHandle(AllocArtMethodArray(self, kImtSize))); 3886 if (UNLIKELY(imtable.Get() == NULL)) { 3887 CHECK(self->IsExceptionPending()); // OOME. 3888 return false; 3889 } 3890 MethodHelper interface_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3891 MethodHelper vtable_mh(hs.NewHandle<mirror::ArtMethod>(nullptr)); 3892 std::vector<mirror::ArtMethod*> miranda_list; 3893 for (size_t i = 0; i < ifcount; ++i) { 3894 size_t num_methods = iftable->GetInterface(i)->NumVirtualMethods(); 3895 if (num_methods > 0) { 3896 StackHandleScope<2> hs(self); 3897 Handle<mirror::ObjectArray<mirror::ArtMethod>> 3898 method_array(hs.NewHandle(AllocArtMethodArray(self, num_methods))); 3899 if (UNLIKELY(method_array.Get() == nullptr)) { 3900 CHECK(self->IsExceptionPending()); // OOME. 3901 return false; 3902 } 3903 iftable->SetMethodArray(i, method_array.Get()); 3904 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3905 hs.NewHandle(klass->GetVTableDuringLinking())); 3906 for (size_t j = 0; j < num_methods; ++j) { 3907 mirror::ArtMethod* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j); 3908 interface_mh.ChangeMethod(interface_method); 3909 int32_t k; 3910 // For each method listed in the interface's method list, find the 3911 // matching method in our class's method list. We want to favor the 3912 // subclass over the superclass, which just requires walking 3913 // back from the end of the vtable. (This only matters if the 3914 // superclass defines a private method and this class redefines 3915 // it -- otherwise it would use the same vtable slot. In .dex files 3916 // those don't end up in the virtual method table, so it shouldn't 3917 // matter which direction we go. We walk it backward anyway.) 3918 for (k = vtable->GetLength() - 1; k >= 0; --k) { 3919 mirror::ArtMethod* vtable_method = vtable->Get(k); 3920 vtable_mh.ChangeMethod(vtable_method); 3921 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3922 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) { 3923 ThrowIllegalAccessError( 3924 klass.Get(), 3925 "Method '%s' implementing interface method '%s' is not public", 3926 PrettyMethod(vtable_method).c_str(), 3927 PrettyMethod(interface_method).c_str()); 3928 return false; 3929 } 3930 method_array->Set<false>(j, vtable_method); 3931 // Place method in imt if entry is empty, place conflict otherwise. 3932 uint32_t imt_index = interface_method->GetDexMethodIndex() % kImtSize; 3933 if (imtable->Get(imt_index) == NULL) { 3934 imtable->Set<false>(imt_index, vtable_method); 3935 imtable_changed = true; 3936 } else { 3937 imtable->Set<false>(imt_index, runtime->GetImtConflictMethod()); 3938 } 3939 break; 3940 } 3941 } 3942 if (k < 0) { 3943 StackHandleScope<1> hs(self); 3944 auto miranda_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 3945 for (mirror::ArtMethod* mir_method : miranda_list) { 3946 vtable_mh.ChangeMethod(mir_method); 3947 if (interface_mh.HasSameNameAndSignature(&vtable_mh)) { 3948 miranda_method.Assign(mir_method); 3949 break; 3950 } 3951 } 3952 if (miranda_method.Get() == NULL) { 3953 // Point the interface table at a phantom slot. 3954 miranda_method.Assign(down_cast<mirror::ArtMethod*>(interface_method->Clone(self))); 3955 if (UNLIKELY(miranda_method.Get() == NULL)) { 3956 CHECK(self->IsExceptionPending()); // OOME. 3957 return false; 3958 } 3959 // TODO: If a methods move then the miranda_list may hold stale references. 3960 miranda_list.push_back(miranda_method.Get()); 3961 } 3962 method_array->Set<false>(j, miranda_method.Get()); 3963 } 3964 } 3965 } 3966 } 3967 if (imtable_changed) { 3968 // Fill in empty entries in interface method table with conflict. 3969 mirror::ArtMethod* imt_conflict_method = runtime->GetImtConflictMethod(); 3970 for (size_t i = 0; i < kImtSize; i++) { 3971 if (imtable->Get(i) == NULL) { 3972 imtable->Set<false>(i, imt_conflict_method); 3973 } 3974 } 3975 klass->SetImTable(imtable.Get()); 3976 } 3977 if (!miranda_list.empty()) { 3978 int old_method_count = klass->NumVirtualMethods(); 3979 int new_method_count = old_method_count + miranda_list.size(); 3980 mirror::ObjectArray<mirror::ArtMethod>* virtuals; 3981 if (old_method_count == 0) { 3982 virtuals = AllocArtMethodArray(self, new_method_count); 3983 } else { 3984 virtuals = klass->GetVirtualMethods()->CopyOf(self, new_method_count); 3985 } 3986 if (UNLIKELY(virtuals == NULL)) { 3987 CHECK(self->IsExceptionPending()); // OOME. 3988 return false; 3989 } 3990 klass->SetVirtualMethods(virtuals); 3991 3992 StackHandleScope<1> hs(self); 3993 Handle<mirror::ObjectArray<mirror::ArtMethod>> vtable( 3994 hs.NewHandle(klass->GetVTableDuringLinking())); 3995 CHECK(vtable.Get() != NULL); 3996 int old_vtable_count = vtable->GetLength(); 3997 int new_vtable_count = old_vtable_count + miranda_list.size(); 3998 vtable.Assign(vtable->CopyOf(self, new_vtable_count)); 3999 if (UNLIKELY(vtable.Get() == NULL)) { 4000 CHECK(self->IsExceptionPending()); // OOME. 4001 return false; 4002 } 4003 for (size_t i = 0; i < miranda_list.size(); ++i) { 4004 mirror::ArtMethod* method = miranda_list[i]; 4005 // Leave the declaring class alone as type indices are relative to it 4006 method->SetAccessFlags(method->GetAccessFlags() | kAccMiranda); 4007 method->SetMethodIndex(0xFFFF & (old_vtable_count + i)); 4008 klass->SetVirtualMethod(old_method_count + i, method); 4009 vtable->Set<false>(old_vtable_count + i, method); 4010 } 4011 // TODO: do not assign to the vtable field until it is fully constructed. 4012 klass->SetVTable(vtable.Get()); 4013 } 4014 4015 mirror::ObjectArray<mirror::ArtMethod>* vtable = klass->GetVTableDuringLinking(); 4016 for (int i = 0; i < vtable->GetLength(); ++i) { 4017 CHECK(vtable->Get(i) != NULL); 4018 } 4019 4020// klass->DumpClass(std::cerr, Class::kDumpClassFullDetail); 4021 4022 return true; 4023} 4024 4025bool ClassLinker::LinkInstanceFields(Handle<mirror::Class> klass) { 4026 CHECK(klass.Get() != NULL); 4027 return LinkFields(klass, false); 4028} 4029 4030bool ClassLinker::LinkStaticFields(Handle<mirror::Class> klass) { 4031 CHECK(klass.Get() != NULL); 4032 size_t allocated_class_size = klass->GetClassSize(); 4033 bool success = LinkFields(klass, true); 4034 CHECK_EQ(allocated_class_size, klass->GetClassSize()); 4035 return success; 4036} 4037 4038struct LinkFieldsComparator { 4039 explicit LinkFieldsComparator() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4040 } 4041 // No thread safety analysis as will be called from STL. Checked lock held in constructor. 4042 bool operator()(mirror::ArtField* field1, mirror::ArtField* field2) 4043 NO_THREAD_SAFETY_ANALYSIS { 4044 // First come reference fields, then 64-bit, and finally 32-bit 4045 Primitive::Type type1 = field1->GetTypeAsPrimitiveType(); 4046 Primitive::Type type2 = field2->GetTypeAsPrimitiveType(); 4047 if (type1 != type2) { 4048 bool is_primitive1 = type1 != Primitive::kPrimNot; 4049 bool is_primitive2 = type2 != Primitive::kPrimNot; 4050 bool is64bit1 = is_primitive1 && (type1 == Primitive::kPrimLong || 4051 type1 == Primitive::kPrimDouble); 4052 bool is64bit2 = is_primitive2 && (type2 == Primitive::kPrimLong || 4053 type2 == Primitive::kPrimDouble); 4054 int order1 = !is_primitive1 ? 0 : (is64bit1 ? 1 : 2); 4055 int order2 = !is_primitive2 ? 0 : (is64bit2 ? 1 : 2); 4056 if (order1 != order2) { 4057 return order1 < order2; 4058 } 4059 } 4060 // same basic group? then sort by string. 4061 return strcmp(field1->GetName(), field2->GetName()) < 0; 4062 } 4063}; 4064 4065bool ClassLinker::LinkFields(Handle<mirror::Class> klass, bool is_static) { 4066 size_t num_fields = 4067 is_static ? klass->NumStaticFields() : klass->NumInstanceFields(); 4068 4069 mirror::ObjectArray<mirror::ArtField>* fields = 4070 is_static ? klass->GetSFields() : klass->GetIFields(); 4071 4072 // Initialize size and field_offset 4073 size_t size; 4074 MemberOffset field_offset(0); 4075 if (is_static) { 4076 size = klass->GetClassSize(); 4077 field_offset = mirror::Class::FieldsOffset(); 4078 } else { 4079 mirror::Class* super_class = klass->GetSuperClass(); 4080 if (super_class != NULL) { 4081 CHECK(super_class->IsResolved()) 4082 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class); 4083 field_offset = MemberOffset(super_class->GetObjectSize()); 4084 } 4085 size = field_offset.Uint32Value(); 4086 } 4087 4088 CHECK_EQ(num_fields == 0, fields == NULL) << PrettyClass(klass.Get()); 4089 4090 // we want a relatively stable order so that adding new fields 4091 // minimizes disruption of C++ version such as Class and Method. 4092 std::deque<mirror::ArtField*> grouped_and_sorted_fields; 4093 for (size_t i = 0; i < num_fields; i++) { 4094 mirror::ArtField* f = fields->Get(i); 4095 CHECK(f != NULL) << PrettyClass(klass.Get()); 4096 grouped_and_sorted_fields.push_back(f); 4097 } 4098 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(), 4099 LinkFieldsComparator()); 4100 4101 // References should be at the front. 4102 size_t current_field = 0; 4103 size_t num_reference_fields = 0; 4104 for (; current_field < num_fields; current_field++) { 4105 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4106 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4107 bool isPrimitive = type != Primitive::kPrimNot; 4108 if (isPrimitive) { 4109 break; // past last reference, move on to the next phase 4110 } 4111 grouped_and_sorted_fields.pop_front(); 4112 num_reference_fields++; 4113 fields->Set<false>(current_field, field); 4114 field->SetOffset(field_offset); 4115 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4116 } 4117 4118 // Now we want to pack all of the double-wide fields together. If 4119 // we're not aligned, though, we want to shuffle one 32-bit field 4120 // into place. If we can't find one, we'll have to pad it. 4121 if (current_field != num_fields && !IsAligned<8>(field_offset.Uint32Value())) { 4122 for (size_t i = 0; i < grouped_and_sorted_fields.size(); i++) { 4123 mirror::ArtField* field = grouped_and_sorted_fields[i]; 4124 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4125 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4126 if (type == Primitive::kPrimLong || type == Primitive::kPrimDouble) { 4127 continue; 4128 } 4129 fields->Set<false>(current_field++, field); 4130 field->SetOffset(field_offset); 4131 // drop the consumed field 4132 grouped_and_sorted_fields.erase(grouped_and_sorted_fields.begin() + i); 4133 break; 4134 } 4135 // whether we found a 32-bit field for padding or not, we advance 4136 field_offset = MemberOffset(field_offset.Uint32Value() + sizeof(uint32_t)); 4137 } 4138 4139 // Alignment is good, shuffle any double-wide fields forward, and 4140 // finish assigning field offsets to all fields. 4141 DCHECK(current_field == num_fields || IsAligned<8>(field_offset.Uint32Value())) 4142 << PrettyClass(klass.Get()); 4143 while (!grouped_and_sorted_fields.empty()) { 4144 mirror::ArtField* field = grouped_and_sorted_fields.front(); 4145 grouped_and_sorted_fields.pop_front(); 4146 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4147 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types 4148 fields->Set<false>(current_field, field); 4149 field->SetOffset(field_offset); 4150 field_offset = MemberOffset(field_offset.Uint32Value() + 4151 ((type == Primitive::kPrimLong || type == Primitive::kPrimDouble) 4152 ? sizeof(uint64_t) 4153 : sizeof(uint32_t))); 4154 current_field++; 4155 } 4156 4157 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it. 4158 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) { 4159 // We know there are no non-reference fields in the Reference classes, and we know 4160 // that 'referent' is alphabetically last, so this is easy... 4161 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get()); 4162 CHECK_STREQ(fields->Get(num_fields - 1)->GetName(), "referent") << PrettyClass(klass.Get()); 4163 --num_reference_fields; 4164 } 4165 4166 if (kIsDebugBuild) { 4167 // Make sure that all reference fields appear before 4168 // non-reference fields, and all double-wide fields are aligned. 4169 bool seen_non_ref = false; 4170 for (size_t i = 0; i < num_fields; i++) { 4171 mirror::ArtField* field = fields->Get(i); 4172 if (false) { // enable to debug field layout 4173 LOG(INFO) << "LinkFields: " << (is_static ? "static" : "instance") 4174 << " class=" << PrettyClass(klass.Get()) 4175 << " field=" << PrettyField(field) 4176 << " offset=" 4177 << field->GetField32(MemberOffset(mirror::ArtField::OffsetOffset())); 4178 } 4179 Primitive::Type type = field->GetTypeAsPrimitiveType(); 4180 bool is_primitive = type != Primitive::kPrimNot; 4181 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") && 4182 strcmp("referent", field->GetName()) == 0) { 4183 is_primitive = true; // We lied above, so we have to expect a lie here. 4184 } 4185 if (is_primitive) { 4186 if (!seen_non_ref) { 4187 seen_non_ref = true; 4188 DCHECK_EQ(num_reference_fields, i) << PrettyField(field); 4189 } 4190 } else { 4191 DCHECK(!seen_non_ref) << PrettyField(field); 4192 } 4193 } 4194 if (!seen_non_ref) { 4195 DCHECK_EQ(num_fields, num_reference_fields) << PrettyClass(klass.Get()); 4196 } 4197 } 4198 size = field_offset.Uint32Value(); 4199 // Update klass 4200 if (is_static) { 4201 klass->SetNumReferenceStaticFields(num_reference_fields); 4202 klass->SetClassSize(size); 4203 } else { 4204 klass->SetNumReferenceInstanceFields(num_reference_fields); 4205 if (!klass->IsVariableSize()) { 4206 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(); 4207 size_t previous_size = klass->GetObjectSize(); 4208 if (previous_size != 0) { 4209 // Make sure that we didn't originally have an incorrect size. 4210 CHECK_EQ(previous_size, size) << klass->GetDescriptor(); 4211 } 4212 klass->SetObjectSize(size); 4213 } 4214 } 4215 return true; 4216} 4217 4218// Set the bitmap of reference offsets, refOffsets, from the ifields 4219// list. 4220void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) { 4221 uint32_t reference_offsets = 0; 4222 mirror::Class* super_class = klass->GetSuperClass(); 4223 if (super_class != NULL) { 4224 reference_offsets = super_class->GetReferenceInstanceOffsets(); 4225 // If our superclass overflowed, we don't stand a chance. 4226 if (reference_offsets == CLASS_WALK_SUPER) { 4227 klass->SetReferenceInstanceOffsets(reference_offsets); 4228 return; 4229 } 4230 } 4231 CreateReferenceOffsets(klass, false, reference_offsets); 4232} 4233 4234void ClassLinker::CreateReferenceStaticOffsets(Handle<mirror::Class> klass) { 4235 CreateReferenceOffsets(klass, true, 0); 4236} 4237 4238void ClassLinker::CreateReferenceOffsets(Handle<mirror::Class> klass, bool is_static, 4239 uint32_t reference_offsets) { 4240 size_t num_reference_fields = 4241 is_static ? klass->NumReferenceStaticFieldsDuringLinking() 4242 : klass->NumReferenceInstanceFieldsDuringLinking(); 4243 mirror::ObjectArray<mirror::ArtField>* fields = 4244 is_static ? klass->GetSFields() : klass->GetIFields(); 4245 // All of the fields that contain object references are guaranteed 4246 // to be at the beginning of the fields list. 4247 for (size_t i = 0; i < num_reference_fields; ++i) { 4248 // Note that byte_offset is the offset from the beginning of 4249 // object, not the offset into instance data 4250 mirror::ArtField* field = fields->Get(i); 4251 MemberOffset byte_offset = field->GetOffsetDuringLinking(); 4252 CHECK_EQ(byte_offset.Uint32Value() & (CLASS_OFFSET_ALIGNMENT - 1), 0U); 4253 if (CLASS_CAN_ENCODE_OFFSET(byte_offset.Uint32Value())) { 4254 uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset.Uint32Value()); 4255 CHECK_NE(new_bit, 0U); 4256 reference_offsets |= new_bit; 4257 } else { 4258 reference_offsets = CLASS_WALK_SUPER; 4259 break; 4260 } 4261 } 4262 // Update fields in klass 4263 if (is_static) { 4264 klass->SetReferenceStaticOffsets(reference_offsets); 4265 } else { 4266 klass->SetReferenceInstanceOffsets(reference_offsets); 4267 } 4268} 4269 4270mirror::String* ClassLinker::ResolveString(const DexFile& dex_file, uint32_t string_idx, 4271 Handle<mirror::DexCache> dex_cache) { 4272 DCHECK(dex_cache.Get() != nullptr); 4273 mirror::String* resolved = dex_cache->GetResolvedString(string_idx); 4274 if (resolved != NULL) { 4275 return resolved; 4276 } 4277 uint32_t utf16_length; 4278 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length); 4279 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data); 4280 dex_cache->SetResolvedString(string_idx, string); 4281 return string; 4282} 4283 4284mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4285 mirror::Class* referrer) { 4286 StackHandleScope<2> hs(Thread::Current()); 4287 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 4288 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader())); 4289 return ResolveType(dex_file, type_idx, dex_cache, class_loader); 4290} 4291 4292mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file, uint16_t type_idx, 4293 Handle<mirror::DexCache> dex_cache, 4294 Handle<mirror::ClassLoader> class_loader) { 4295 DCHECK(dex_cache.Get() != NULL); 4296 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx); 4297 if (resolved == NULL) { 4298 Thread* self = Thread::Current(); 4299 const char* descriptor = dex_file.StringByTypeIdx(type_idx); 4300 resolved = FindClass(self, descriptor, class_loader); 4301 if (resolved != NULL) { 4302 // TODO: we used to throw here if resolved's class loader was not the 4303 // boot class loader. This was to permit different classes with the 4304 // same name to be loaded simultaneously by different loaders 4305 dex_cache->SetResolvedType(type_idx, resolved); 4306 } else { 4307 CHECK(self->IsExceptionPending()) 4308 << "Expected pending exception for failed resolution of: " << descriptor; 4309 // Convert a ClassNotFoundException to a NoClassDefFoundError. 4310 StackHandleScope<1> hs(self); 4311 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException(nullptr))); 4312 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) { 4313 DCHECK(resolved == NULL); // No Handle needed to preserve resolved. 4314 self->ClearException(); 4315 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor); 4316 self->GetException(NULL)->SetCause(cause.Get()); 4317 } 4318 } 4319 } 4320 DCHECK((resolved == NULL) || resolved->IsResolved() || resolved->IsErroneous()) 4321 << PrettyDescriptor(resolved) << " " << resolved->GetStatus(); 4322 return resolved; 4323} 4324 4325mirror::ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file, uint32_t method_idx, 4326 Handle<mirror::DexCache> dex_cache, 4327 Handle<mirror::ClassLoader> class_loader, 4328 Handle<mirror::ArtMethod> referrer, 4329 InvokeType type) { 4330 DCHECK(dex_cache.Get() != NULL); 4331 // Check for hit in the dex cache. 4332 mirror::ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx); 4333 if (resolved != nullptr && !resolved->IsRuntimeMethod()) { 4334 return resolved; 4335 } 4336 // Fail, get the declaring class. 4337 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4338 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader); 4339 if (klass == NULL) { 4340 DCHECK(Thread::Current()->IsExceptionPending()); 4341 return NULL; 4342 } 4343 // Scan using method_idx, this saves string compares but will only hit for matching dex 4344 // caches/files. 4345 switch (type) { 4346 case kDirect: // Fall-through. 4347 case kStatic: 4348 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx); 4349 break; 4350 case kInterface: 4351 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx); 4352 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4353 break; 4354 case kSuper: // Fall-through. 4355 case kVirtual: 4356 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx); 4357 break; 4358 default: 4359 LOG(FATAL) << "Unreachable - invocation type: " << type; 4360 } 4361 if (resolved == NULL) { 4362 // Search by name, which works across dex files. 4363 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4364 const Signature signature = dex_file.GetMethodSignature(method_id); 4365 switch (type) { 4366 case kDirect: // Fall-through. 4367 case kStatic: 4368 resolved = klass->FindDirectMethod(name, signature); 4369 break; 4370 case kInterface: 4371 resolved = klass->FindInterfaceMethod(name, signature); 4372 DCHECK(resolved == NULL || resolved->GetDeclaringClass()->IsInterface()); 4373 break; 4374 case kSuper: // Fall-through. 4375 case kVirtual: 4376 resolved = klass->FindVirtualMethod(name, signature); 4377 break; 4378 } 4379 } 4380 if (resolved != NULL) { 4381 // We found a method, check for incompatible class changes. 4382 if (resolved->CheckIncompatibleClassChange(type)) { 4383 resolved = NULL; 4384 } 4385 } 4386 if (resolved != NULL) { 4387 // Be a good citizen and update the dex cache to speed subsequent calls. 4388 dex_cache->SetResolvedMethod(method_idx, resolved); 4389 return resolved; 4390 } else { 4391 // We failed to find the method which means either an access error, an incompatible class 4392 // change, or no such method. First try to find the method among direct and virtual methods. 4393 const char* name = dex_file.StringDataByIdx(method_id.name_idx_); 4394 const Signature signature = dex_file.GetMethodSignature(method_id); 4395 switch (type) { 4396 case kDirect: 4397 case kStatic: 4398 resolved = klass->FindVirtualMethod(name, signature); 4399 break; 4400 case kInterface: 4401 case kVirtual: 4402 case kSuper: 4403 resolved = klass->FindDirectMethod(name, signature); 4404 break; 4405 } 4406 4407 // If we found something, check that it can be accessed by the referrer. 4408 if (resolved != NULL && referrer.Get() != NULL) { 4409 mirror::Class* methods_class = resolved->GetDeclaringClass(); 4410 mirror::Class* referring_class = referrer->GetDeclaringClass(); 4411 if (!referring_class->CanAccess(methods_class)) { 4412 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class, 4413 resolved, type); 4414 return NULL; 4415 } else if (!referring_class->CanAccessMember(methods_class, 4416 resolved->GetAccessFlags())) { 4417 ThrowIllegalAccessErrorMethod(referring_class, resolved); 4418 return NULL; 4419 } 4420 } 4421 4422 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check interface 4423 // methods and throw if we find the method there. If we find nothing, throw a NoSuchMethodError. 4424 switch (type) { 4425 case kDirect: 4426 case kStatic: 4427 if (resolved != NULL) { 4428 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4429 } else { 4430 resolved = klass->FindInterfaceMethod(name, signature); 4431 if (resolved != NULL) { 4432 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4433 } else { 4434 ThrowNoSuchMethodError(type, klass, name, signature); 4435 } 4436 } 4437 break; 4438 case kInterface: 4439 if (resolved != NULL) { 4440 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4441 } else { 4442 resolved = klass->FindVirtualMethod(name, signature); 4443 if (resolved != NULL) { 4444 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer.Get()); 4445 } else { 4446 ThrowNoSuchMethodError(type, klass, name, signature); 4447 } 4448 } 4449 break; 4450 case kSuper: 4451 ThrowNoSuchMethodError(type, klass, name, signature); 4452 break; 4453 case kVirtual: 4454 if (resolved != NULL) { 4455 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer.Get()); 4456 } else { 4457 resolved = klass->FindInterfaceMethod(name, signature); 4458 if (resolved != NULL) { 4459 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer.Get()); 4460 } else { 4461 ThrowNoSuchMethodError(type, klass, name, signature); 4462 } 4463 } 4464 break; 4465 } 4466 DCHECK(Thread::Current()->IsExceptionPending()); 4467 return NULL; 4468 } 4469} 4470 4471mirror::ArtField* ClassLinker::ResolveField(const DexFile& dex_file, uint32_t field_idx, 4472 Handle<mirror::DexCache> dex_cache, 4473 Handle<mirror::ClassLoader> class_loader, 4474 bool is_static) { 4475 DCHECK(dex_cache.Get() != nullptr); 4476 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4477 if (resolved != NULL) { 4478 return resolved; 4479 } 4480 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4481 Thread* const self = Thread::Current(); 4482 StackHandleScope<1> hs(self); 4483 Handle<mirror::Class> klass( 4484 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4485 if (klass.Get() == NULL) { 4486 DCHECK(Thread::Current()->IsExceptionPending()); 4487 return NULL; 4488 } 4489 4490 if (is_static) { 4491 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx); 4492 } else { 4493 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx); 4494 } 4495 4496 if (resolved == NULL) { 4497 const char* name = dex_file.GetFieldName(field_id); 4498 const char* type = dex_file.GetFieldTypeDescriptor(field_id); 4499 if (is_static) { 4500 resolved = mirror::Class::FindStaticField(self, klass, name, type); 4501 } else { 4502 resolved = klass->FindInstanceField(name, type); 4503 } 4504 if (resolved == NULL) { 4505 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name); 4506 return NULL; 4507 } 4508 } 4509 dex_cache->SetResolvedField(field_idx, resolved); 4510 return resolved; 4511} 4512 4513mirror::ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file, 4514 uint32_t field_idx, 4515 Handle<mirror::DexCache> dex_cache, 4516 Handle<mirror::ClassLoader> class_loader) { 4517 DCHECK(dex_cache.Get() != nullptr); 4518 mirror::ArtField* resolved = dex_cache->GetResolvedField(field_idx); 4519 if (resolved != NULL) { 4520 return resolved; 4521 } 4522 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx); 4523 Thread* self = Thread::Current(); 4524 StackHandleScope<1> hs(self); 4525 Handle<mirror::Class> klass( 4526 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader))); 4527 if (klass.Get() == NULL) { 4528 DCHECK(Thread::Current()->IsExceptionPending()); 4529 return NULL; 4530 } 4531 4532 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_)); 4533 StringPiece type(dex_file.StringDataByIdx( 4534 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_)); 4535 resolved = mirror::Class::FindField(self, klass, name, type); 4536 if (resolved != NULL) { 4537 dex_cache->SetResolvedField(field_idx, resolved); 4538 } else { 4539 ThrowNoSuchFieldError("", klass.Get(), type, name); 4540 } 4541 return resolved; 4542} 4543 4544const char* ClassLinker::MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, 4545 uint32_t* length) { 4546 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 4547 mirror::DexCache* dex_cache = declaring_class->GetDexCache(); 4548 const DexFile& dex_file = *dex_cache->GetDexFile(); 4549 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx); 4550 return dex_file.GetMethodShorty(method_id, length); 4551} 4552 4553void ClassLinker::DumpAllClasses(int flags) { 4554 if (dex_cache_image_class_lookup_required_) { 4555 MoveImageClassesToClassTable(); 4556 } 4557 // TODO: at the time this was written, it wasn't safe to call PrettyField with the ClassLinker 4558 // lock held, because it might need to resolve a field's type, which would try to take the lock. 4559 std::vector<mirror::Class*> all_classes; 4560 { 4561 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4562 for (std::pair<const size_t, mirror::Class*>& it : class_table_) { 4563 mirror::Class** root = &it.second; 4564 mirror::Class* klass = ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(root); 4565 all_classes.push_back(klass); 4566 } 4567 } 4568 4569 for (size_t i = 0; i < all_classes.size(); ++i) { 4570 all_classes[i]->DumpClass(std::cerr, flags); 4571 } 4572} 4573 4574void ClassLinker::DumpForSigQuit(std::ostream& os) { 4575 if (dex_cache_image_class_lookup_required_) { 4576 MoveImageClassesToClassTable(); 4577 } 4578 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4579 os << "Loaded classes: " << class_table_.size() << " allocated classes\n"; 4580} 4581 4582size_t ClassLinker::NumLoadedClasses() { 4583 if (dex_cache_image_class_lookup_required_) { 4584 MoveImageClassesToClassTable(); 4585 } 4586 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_); 4587 return class_table_.size(); 4588} 4589 4590pid_t ClassLinker::GetClassesLockOwner() { 4591 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid(); 4592} 4593 4594pid_t ClassLinker::GetDexLockOwner() { 4595 return dex_lock_.GetExclusiveOwnerTid(); 4596} 4597 4598void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) { 4599 DCHECK(!init_done_); 4600 4601 DCHECK(klass != NULL); 4602 DCHECK(klass->GetClassLoader() == NULL); 4603 4604 mirror::ObjectArray<mirror::Class>* class_roots = 4605 ReadBarrier::BarrierForRoot<mirror::ObjectArray<mirror::Class>, kWithReadBarrier>( 4606 &class_roots_); 4607 DCHECK(class_roots != NULL); 4608 DCHECK(class_roots->Get(class_root) == NULL); 4609 class_roots->Set<false>(class_root, klass); 4610} 4611 4612} // namespace art 4613